1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2014 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
23 #include "bfd_stdint.h"
28 #include "safe-ctype.h"
29 #include "libiberty.h"
32 /* This struct is used to pass information to routines called via
33 elf_link_hash_traverse which must return failure. */
35 struct elf_info_failed
37 struct bfd_link_info *info;
41 /* This structure is used to pass information to
42 _bfd_elf_link_find_version_dependencies. */
44 struct elf_find_verdep_info
46 /* General link information. */
47 struct bfd_link_info *info;
48 /* The number of dependencies. */
50 /* Whether we had a failure. */
54 static bfd_boolean _bfd_elf_fix_symbol_flags
55 (struct elf_link_hash_entry *, struct elf_info_failed *);
57 /* Define a symbol in a dynamic linkage section. */
59 struct elf_link_hash_entry *
60 _bfd_elf_define_linkage_sym (bfd *abfd,
61 struct bfd_link_info *info,
65 struct elf_link_hash_entry *h;
66 struct bfd_link_hash_entry *bh;
67 const struct elf_backend_data *bed;
69 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
72 /* Zap symbol defined in an as-needed lib that wasn't linked.
73 This is a symptom of a larger problem: Absolute symbols
74 defined in shared libraries can't be overridden, because we
75 lose the link to the bfd which is via the symbol section. */
76 h->root.type = bfd_link_hash_new;
80 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
82 get_elf_backend_data (abfd)->collect,
85 h = (struct elf_link_hash_entry *) bh;
88 h->root.linker_def = 1;
90 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
91 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
93 bed = get_elf_backend_data (abfd);
94 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
99 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
103 struct elf_link_hash_entry *h;
104 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
105 struct elf_link_hash_table *htab = elf_hash_table (info);
107 /* This function may be called more than once. */
108 s = bfd_get_linker_section (abfd, ".got");
112 flags = bed->dynamic_sec_flags;
114 s = bfd_make_section_anyway_with_flags (abfd,
115 (bed->rela_plts_and_copies_p
116 ? ".rela.got" : ".rel.got"),
117 (bed->dynamic_sec_flags
120 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
124 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
126 || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
130 if (bed->want_got_plt)
132 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
134 || !bfd_set_section_alignment (abfd, s,
135 bed->s->log_file_align))
140 /* The first bit of the global offset table is the header. */
141 s->size += bed->got_header_size;
143 if (bed->want_got_sym)
145 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
146 (or .got.plt) section. We don't do this in the linker script
147 because we don't want to define the symbol if we are not creating
148 a global offset table. */
149 h = _bfd_elf_define_linkage_sym (abfd, info, s,
150 "_GLOBAL_OFFSET_TABLE_");
151 elf_hash_table (info)->hgot = h;
159 /* Create a strtab to hold the dynamic symbol names. */
161 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
163 struct elf_link_hash_table *hash_table;
165 hash_table = elf_hash_table (info);
166 if (hash_table->dynobj == NULL)
167 hash_table->dynobj = abfd;
169 if (hash_table->dynstr == NULL)
171 hash_table->dynstr = _bfd_elf_strtab_init ();
172 if (hash_table->dynstr == NULL)
178 /* Create some sections which will be filled in with dynamic linking
179 information. ABFD is an input file which requires dynamic sections
180 to be created. The dynamic sections take up virtual memory space
181 when the final executable is run, so we need to create them before
182 addresses are assigned to the output sections. We work out the
183 actual contents and size of these sections later. */
186 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
190 const struct elf_backend_data *bed;
191 struct elf_link_hash_entry *h;
193 if (! is_elf_hash_table (info->hash))
196 if (elf_hash_table (info)->dynamic_sections_created)
199 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
202 abfd = elf_hash_table (info)->dynobj;
203 bed = get_elf_backend_data (abfd);
205 flags = bed->dynamic_sec_flags;
207 /* A dynamically linked executable has a .interp section, but a
208 shared library does not. */
209 if (info->executable)
211 s = bfd_make_section_anyway_with_flags (abfd, ".interp",
212 flags | SEC_READONLY);
217 /* Create sections to hold version informations. These are removed
218 if they are not needed. */
219 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d",
220 flags | SEC_READONLY);
222 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
225 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version",
226 flags | SEC_READONLY);
228 || ! bfd_set_section_alignment (abfd, s, 1))
231 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r",
232 flags | SEC_READONLY);
234 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
237 s = bfd_make_section_anyway_with_flags (abfd, ".dynsym",
238 flags | SEC_READONLY);
240 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
243 s = bfd_make_section_anyway_with_flags (abfd, ".dynstr",
244 flags | SEC_READONLY);
248 s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags);
250 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
253 /* The special symbol _DYNAMIC is always set to the start of the
254 .dynamic section. We could set _DYNAMIC in a linker script, but we
255 only want to define it if we are, in fact, creating a .dynamic
256 section. We don't want to define it if there is no .dynamic
257 section, since on some ELF platforms the start up code examines it
258 to decide how to initialize the process. */
259 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC");
260 elf_hash_table (info)->hdynamic = h;
266 s = bfd_make_section_anyway_with_flags (abfd, ".hash",
267 flags | SEC_READONLY);
269 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
271 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
274 if (info->emit_gnu_hash)
276 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
277 flags | SEC_READONLY);
279 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
281 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
282 4 32-bit words followed by variable count of 64-bit words, then
283 variable count of 32-bit words. */
284 if (bed->s->arch_size == 64)
285 elf_section_data (s)->this_hdr.sh_entsize = 0;
287 elf_section_data (s)->this_hdr.sh_entsize = 4;
290 /* Let the backend create the rest of the sections. This lets the
291 backend set the right flags. The backend will normally create
292 the .got and .plt sections. */
293 if (bed->elf_backend_create_dynamic_sections == NULL
294 || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
297 elf_hash_table (info)->dynamic_sections_created = TRUE;
302 /* Create dynamic sections when linking against a dynamic object. */
305 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
307 flagword flags, pltflags;
308 struct elf_link_hash_entry *h;
310 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
311 struct elf_link_hash_table *htab = elf_hash_table (info);
313 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
314 .rel[a].bss sections. */
315 flags = bed->dynamic_sec_flags;
318 if (bed->plt_not_loaded)
319 /* We do not clear SEC_ALLOC here because we still want the OS to
320 allocate space for the section; it's just that there's nothing
321 to read in from the object file. */
322 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
324 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
325 if (bed->plt_readonly)
326 pltflags |= SEC_READONLY;
328 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
330 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
334 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
336 if (bed->want_plt_sym)
338 h = _bfd_elf_define_linkage_sym (abfd, info, s,
339 "_PROCEDURE_LINKAGE_TABLE_");
340 elf_hash_table (info)->hplt = h;
345 s = bfd_make_section_anyway_with_flags (abfd,
346 (bed->rela_plts_and_copies_p
347 ? ".rela.plt" : ".rel.plt"),
348 flags | SEC_READONLY);
350 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
354 if (! _bfd_elf_create_got_section (abfd, info))
357 if (bed->want_dynbss)
359 /* The .dynbss section is a place to put symbols which are defined
360 by dynamic objects, are referenced by regular objects, and are
361 not functions. We must allocate space for them in the process
362 image and use a R_*_COPY reloc to tell the dynamic linker to
363 initialize them at run time. The linker script puts the .dynbss
364 section into the .bss section of the final image. */
365 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
366 (SEC_ALLOC | SEC_LINKER_CREATED));
370 /* The .rel[a].bss section holds copy relocs. This section is not
371 normally needed. We need to create it here, though, so that the
372 linker will map it to an output section. We can't just create it
373 only if we need it, because we will not know whether we need it
374 until we have seen all the input files, and the first time the
375 main linker code calls BFD after examining all the input files
376 (size_dynamic_sections) the input sections have already been
377 mapped to the output sections. If the section turns out not to
378 be needed, we can discard it later. We will never need this
379 section when generating a shared object, since they do not use
383 s = bfd_make_section_anyway_with_flags (abfd,
384 (bed->rela_plts_and_copies_p
385 ? ".rela.bss" : ".rel.bss"),
386 flags | SEC_READONLY);
388 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
396 /* Record a new dynamic symbol. We record the dynamic symbols as we
397 read the input files, since we need to have a list of all of them
398 before we can determine the final sizes of the output sections.
399 Note that we may actually call this function even though we are not
400 going to output any dynamic symbols; in some cases we know that a
401 symbol should be in the dynamic symbol table, but only if there is
405 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
406 struct elf_link_hash_entry *h)
408 if (h->dynindx == -1)
410 struct elf_strtab_hash *dynstr;
415 /* XXX: The ABI draft says the linker must turn hidden and
416 internal symbols into STB_LOCAL symbols when producing the
417 DSO. However, if ld.so honors st_other in the dynamic table,
418 this would not be necessary. */
419 switch (ELF_ST_VISIBILITY (h->other))
423 if (h->root.type != bfd_link_hash_undefined
424 && h->root.type != bfd_link_hash_undefweak)
427 if (!elf_hash_table (info)->is_relocatable_executable)
435 h->dynindx = elf_hash_table (info)->dynsymcount;
436 ++elf_hash_table (info)->dynsymcount;
438 dynstr = elf_hash_table (info)->dynstr;
441 /* Create a strtab to hold the dynamic symbol names. */
442 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
447 /* We don't put any version information in the dynamic string
449 name = h->root.root.string;
450 p = strchr (name, ELF_VER_CHR);
452 /* We know that the p points into writable memory. In fact,
453 there are only a few symbols that have read-only names, being
454 those like _GLOBAL_OFFSET_TABLE_ that are created specially
455 by the backends. Most symbols will have names pointing into
456 an ELF string table read from a file, or to objalloc memory. */
459 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
464 if (indx == (bfd_size_type) -1)
466 h->dynstr_index = indx;
472 /* Mark a symbol dynamic. */
475 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
476 struct elf_link_hash_entry *h,
477 Elf_Internal_Sym *sym)
479 struct bfd_elf_dynamic_list *d = info->dynamic_list;
481 /* It may be called more than once on the same H. */
482 if(h->dynamic || info->relocatable)
485 if ((info->dynamic_data
486 && (h->type == STT_OBJECT
488 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
490 && h->root.type == bfd_link_hash_new
491 && (*d->match) (&d->head, NULL, h->root.root.string)))
495 /* Record an assignment to a symbol made by a linker script. We need
496 this in case some dynamic object refers to this symbol. */
499 bfd_elf_record_link_assignment (bfd *output_bfd,
500 struct bfd_link_info *info,
505 struct elf_link_hash_entry *h, *hv;
506 struct elf_link_hash_table *htab;
507 const struct elf_backend_data *bed;
509 if (!is_elf_hash_table (info->hash))
512 htab = elf_hash_table (info);
513 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
517 switch (h->root.type)
519 case bfd_link_hash_defined:
520 case bfd_link_hash_defweak:
521 case bfd_link_hash_common:
523 case bfd_link_hash_undefweak:
524 case bfd_link_hash_undefined:
525 /* Since we're defining the symbol, don't let it seem to have not
526 been defined. record_dynamic_symbol and size_dynamic_sections
527 may depend on this. */
528 h->root.type = bfd_link_hash_new;
529 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
530 bfd_link_repair_undef_list (&htab->root);
532 case bfd_link_hash_new:
533 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
536 case bfd_link_hash_indirect:
537 /* We had a versioned symbol in a dynamic library. We make the
538 the versioned symbol point to this one. */
539 bed = get_elf_backend_data (output_bfd);
541 while (hv->root.type == bfd_link_hash_indirect
542 || hv->root.type == bfd_link_hash_warning)
543 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
544 /* We don't need to update h->root.u since linker will set them
546 h->root.type = bfd_link_hash_undefined;
547 hv->root.type = bfd_link_hash_indirect;
548 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
549 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
551 case bfd_link_hash_warning:
556 /* If this symbol is being provided by the linker script, and it is
557 currently defined by a dynamic object, but not by a regular
558 object, then mark it as undefined so that the generic linker will
559 force the correct value. */
563 h->root.type = bfd_link_hash_undefined;
565 /* If this symbol is not being provided by the linker script, and it is
566 currently defined by a dynamic object, but not by a regular object,
567 then clear out any version information because the symbol will not be
568 associated with the dynamic object any more. */
572 h->verinfo.verdef = NULL;
578 bed = get_elf_backend_data (output_bfd);
579 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
580 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
581 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
584 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
586 if (!info->relocatable
588 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
589 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
595 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
598 if (! bfd_elf_link_record_dynamic_symbol (info, h))
601 /* If this is a weak defined symbol, and we know a corresponding
602 real symbol from the same dynamic object, make sure the real
603 symbol is also made into a dynamic symbol. */
604 if (h->u.weakdef != NULL
605 && h->u.weakdef->dynindx == -1)
607 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
615 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
616 success, and 2 on a failure caused by attempting to record a symbol
617 in a discarded section, eg. a discarded link-once section symbol. */
620 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
625 struct elf_link_local_dynamic_entry *entry;
626 struct elf_link_hash_table *eht;
627 struct elf_strtab_hash *dynstr;
628 unsigned long dynstr_index;
630 Elf_External_Sym_Shndx eshndx;
631 char esym[sizeof (Elf64_External_Sym)];
633 if (! is_elf_hash_table (info->hash))
636 /* See if the entry exists already. */
637 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
638 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
641 amt = sizeof (*entry);
642 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
646 /* Go find the symbol, so that we can find it's name. */
647 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
648 1, input_indx, &entry->isym, esym, &eshndx))
650 bfd_release (input_bfd, entry);
654 if (entry->isym.st_shndx != SHN_UNDEF
655 && entry->isym.st_shndx < SHN_LORESERVE)
659 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
660 if (s == NULL || bfd_is_abs_section (s->output_section))
662 /* We can still bfd_release here as nothing has done another
663 bfd_alloc. We can't do this later in this function. */
664 bfd_release (input_bfd, entry);
669 name = (bfd_elf_string_from_elf_section
670 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
671 entry->isym.st_name));
673 dynstr = elf_hash_table (info)->dynstr;
676 /* Create a strtab to hold the dynamic symbol names. */
677 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
682 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
683 if (dynstr_index == (unsigned long) -1)
685 entry->isym.st_name = dynstr_index;
687 eht = elf_hash_table (info);
689 entry->next = eht->dynlocal;
690 eht->dynlocal = entry;
691 entry->input_bfd = input_bfd;
692 entry->input_indx = input_indx;
695 /* Whatever binding the symbol had before, it's now local. */
697 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
699 /* The dynindx will be set at the end of size_dynamic_sections. */
704 /* Return the dynindex of a local dynamic symbol. */
707 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
711 struct elf_link_local_dynamic_entry *e;
713 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
714 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
719 /* This function is used to renumber the dynamic symbols, if some of
720 them are removed because they are marked as local. This is called
721 via elf_link_hash_traverse. */
724 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
727 size_t *count = (size_t *) data;
732 if (h->dynindx != -1)
733 h->dynindx = ++(*count);
739 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
740 STB_LOCAL binding. */
743 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
746 size_t *count = (size_t *) data;
748 if (!h->forced_local)
751 if (h->dynindx != -1)
752 h->dynindx = ++(*count);
757 /* Return true if the dynamic symbol for a given section should be
758 omitted when creating a shared library. */
760 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
761 struct bfd_link_info *info,
764 struct elf_link_hash_table *htab;
767 switch (elf_section_data (p)->this_hdr.sh_type)
771 /* If sh_type is yet undecided, assume it could be
772 SHT_PROGBITS/SHT_NOBITS. */
774 htab = elf_hash_table (info);
775 if (p == htab->tls_sec)
778 if (htab->text_index_section != NULL)
779 return p != htab->text_index_section && p != htab->data_index_section;
781 return (htab->dynobj != NULL
782 && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
783 && ip->output_section == p);
785 /* There shouldn't be section relative relocations
786 against any other section. */
792 /* Assign dynsym indices. In a shared library we generate a section
793 symbol for each output section, which come first. Next come symbols
794 which have been forced to local binding. Then all of the back-end
795 allocated local dynamic syms, followed by the rest of the global
799 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
800 struct bfd_link_info *info,
801 unsigned long *section_sym_count)
803 unsigned long dynsymcount = 0;
805 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
807 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
809 for (p = output_bfd->sections; p ; p = p->next)
810 if ((p->flags & SEC_EXCLUDE) == 0
811 && (p->flags & SEC_ALLOC) != 0
812 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
813 elf_section_data (p)->dynindx = ++dynsymcount;
815 elf_section_data (p)->dynindx = 0;
817 *section_sym_count = dynsymcount;
819 elf_link_hash_traverse (elf_hash_table (info),
820 elf_link_renumber_local_hash_table_dynsyms,
823 if (elf_hash_table (info)->dynlocal)
825 struct elf_link_local_dynamic_entry *p;
826 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
827 p->dynindx = ++dynsymcount;
830 elf_link_hash_traverse (elf_hash_table (info),
831 elf_link_renumber_hash_table_dynsyms,
834 /* There is an unused NULL entry at the head of the table which
835 we must account for in our count. Unless there weren't any
836 symbols, which means we'll have no table at all. */
837 if (dynsymcount != 0)
840 elf_hash_table (info)->dynsymcount = dynsymcount;
844 /* Merge st_other field. */
847 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
848 const Elf_Internal_Sym *isym, asection *sec,
849 bfd_boolean definition, bfd_boolean dynamic)
851 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
853 /* If st_other has a processor-specific meaning, specific
854 code might be needed here. */
855 if (bed->elf_backend_merge_symbol_attribute)
856 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
861 unsigned symvis = ELF_ST_VISIBILITY (isym->st_other);
862 unsigned hvis = ELF_ST_VISIBILITY (h->other);
864 /* Keep the most constraining visibility. Leave the remainder
865 of the st_other field to elf_backend_merge_symbol_attribute. */
866 if (symvis - 1 < hvis - 1)
867 h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
870 && ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT
871 && (sec->flags & SEC_READONLY) == 0)
872 h->protected_def = 1;
875 /* This function is called when we want to merge a new symbol with an
876 existing symbol. It handles the various cases which arise when we
877 find a definition in a dynamic object, or when there is already a
878 definition in a dynamic object. The new symbol is described by
879 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
880 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
881 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
882 of an old common symbol. We set OVERRIDE if the old symbol is
883 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
884 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
885 to change. By OK to change, we mean that we shouldn't warn if the
886 type or size does change. */
889 _bfd_elf_merge_symbol (bfd *abfd,
890 struct bfd_link_info *info,
892 Elf_Internal_Sym *sym,
895 struct elf_link_hash_entry **sym_hash,
897 bfd_boolean *pold_weak,
898 unsigned int *pold_alignment,
900 bfd_boolean *override,
901 bfd_boolean *type_change_ok,
902 bfd_boolean *size_change_ok)
904 asection *sec, *oldsec;
905 struct elf_link_hash_entry *h;
906 struct elf_link_hash_entry *hi;
907 struct elf_link_hash_entry *flip;
910 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
911 bfd_boolean newweak, oldweak, newfunc, oldfunc;
912 const struct elf_backend_data *bed;
918 bind = ELF_ST_BIND (sym->st_info);
920 if (! bfd_is_und_section (sec))
921 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
923 h = ((struct elf_link_hash_entry *)
924 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
929 bed = get_elf_backend_data (abfd);
931 /* For merging, we only care about real symbols. But we need to make
932 sure that indirect symbol dynamic flags are updated. */
934 while (h->root.type == bfd_link_hash_indirect
935 || h->root.type == bfd_link_hash_warning)
936 h = (struct elf_link_hash_entry *) h->root.u.i.link;
938 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
943 switch (h->root.type)
948 case bfd_link_hash_undefined:
949 case bfd_link_hash_undefweak:
950 oldbfd = h->root.u.undef.abfd;
953 case bfd_link_hash_defined:
954 case bfd_link_hash_defweak:
955 oldbfd = h->root.u.def.section->owner;
956 oldsec = h->root.u.def.section;
959 case bfd_link_hash_common:
960 oldbfd = h->root.u.c.p->section->owner;
961 oldsec = h->root.u.c.p->section;
963 *pold_alignment = h->root.u.c.p->alignment_power;
966 if (poldbfd && *poldbfd == NULL)
969 /* Differentiate strong and weak symbols. */
970 newweak = bind == STB_WEAK;
971 oldweak = (h->root.type == bfd_link_hash_defweak
972 || h->root.type == bfd_link_hash_undefweak);
974 *pold_weak = oldweak;
976 /* This code is for coping with dynamic objects, and is only useful
977 if we are doing an ELF link. */
978 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
981 /* We have to check it for every instance since the first few may be
982 references and not all compilers emit symbol type for undefined
984 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
986 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
987 respectively, is from a dynamic object. */
989 newdyn = (abfd->flags & DYNAMIC) != 0;
991 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
992 syms and defined syms in dynamic libraries respectively.
993 ref_dynamic on the other hand can be set for a symbol defined in
994 a dynamic library, and def_dynamic may not be set; When the
995 definition in a dynamic lib is overridden by a definition in the
996 executable use of the symbol in the dynamic lib becomes a
997 reference to the executable symbol. */
1000 if (bfd_is_und_section (sec))
1002 if (bind != STB_WEAK)
1004 h->ref_dynamic_nonweak = 1;
1005 hi->ref_dynamic_nonweak = 1;
1011 hi->dynamic_def = 1;
1015 /* If we just created the symbol, mark it as being an ELF symbol.
1016 Other than that, there is nothing to do--there is no merge issue
1017 with a newly defined symbol--so we just return. */
1019 if (h->root.type == bfd_link_hash_new)
1025 /* In cases involving weak versioned symbols, we may wind up trying
1026 to merge a symbol with itself. Catch that here, to avoid the
1027 confusion that results if we try to override a symbol with
1028 itself. The additional tests catch cases like
1029 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1030 dynamic object, which we do want to handle here. */
1032 && (newweak || oldweak)
1033 && ((abfd->flags & DYNAMIC) == 0
1034 || !h->def_regular))
1039 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1040 else if (oldsec != NULL)
1042 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1043 indices used by MIPS ELF. */
1044 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1047 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1048 respectively, appear to be a definition rather than reference. */
1050 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1052 olddef = (h->root.type != bfd_link_hash_undefined
1053 && h->root.type != bfd_link_hash_undefweak
1054 && h->root.type != bfd_link_hash_common);
1056 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1057 respectively, appear to be a function. */
1059 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1060 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1062 oldfunc = (h->type != STT_NOTYPE
1063 && bed->is_function_type (h->type));
1065 /* When we try to create a default indirect symbol from the dynamic
1066 definition with the default version, we skip it if its type and
1067 the type of existing regular definition mismatch. */
1068 if (pold_alignment == NULL
1072 && (((olddef || h->root.type == bfd_link_hash_common)
1073 && ELF_ST_TYPE (sym->st_info) != h->type
1074 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1075 && h->type != STT_NOTYPE
1076 && !(newfunc && oldfunc))
1078 && ((h->type == STT_GNU_IFUNC)
1079 != (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)))))
1085 /* Check TLS symbols. We don't check undefined symbols introduced
1086 by "ld -u" which have no type (and oldbfd NULL), and we don't
1087 check symbols from plugins because they also have no type. */
1089 && (oldbfd->flags & BFD_PLUGIN) == 0
1090 && (abfd->flags & BFD_PLUGIN) == 0
1091 && ELF_ST_TYPE (sym->st_info) != h->type
1092 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1095 bfd_boolean ntdef, tdef;
1096 asection *ntsec, *tsec;
1098 if (h->type == STT_TLS)
1118 (*_bfd_error_handler)
1119 (_("%s: TLS definition in %B section %A "
1120 "mismatches non-TLS definition in %B section %A"),
1121 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1122 else if (!tdef && !ntdef)
1123 (*_bfd_error_handler)
1124 (_("%s: TLS reference in %B "
1125 "mismatches non-TLS reference in %B"),
1126 tbfd, ntbfd, h->root.root.string);
1128 (*_bfd_error_handler)
1129 (_("%s: TLS definition in %B section %A "
1130 "mismatches non-TLS reference in %B"),
1131 tbfd, tsec, ntbfd, h->root.root.string);
1133 (*_bfd_error_handler)
1134 (_("%s: TLS reference in %B "
1135 "mismatches non-TLS definition in %B section %A"),
1136 tbfd, ntbfd, ntsec, h->root.root.string);
1138 bfd_set_error (bfd_error_bad_value);
1142 /* If the old symbol has non-default visibility, we ignore the new
1143 definition from a dynamic object. */
1145 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1146 && !bfd_is_und_section (sec))
1149 /* Make sure this symbol is dynamic. */
1151 hi->ref_dynamic = 1;
1152 /* A protected symbol has external availability. Make sure it is
1153 recorded as dynamic.
1155 FIXME: Should we check type and size for protected symbol? */
1156 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1157 return bfd_elf_link_record_dynamic_symbol (info, h);
1162 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1165 /* If the new symbol with non-default visibility comes from a
1166 relocatable file and the old definition comes from a dynamic
1167 object, we remove the old definition. */
1168 if (hi->root.type == bfd_link_hash_indirect)
1170 /* Handle the case where the old dynamic definition is
1171 default versioned. We need to copy the symbol info from
1172 the symbol with default version to the normal one if it
1173 was referenced before. */
1176 hi->root.type = h->root.type;
1177 h->root.type = bfd_link_hash_indirect;
1178 (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
1180 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1181 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1183 /* If the new symbol is hidden or internal, completely undo
1184 any dynamic link state. */
1185 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1186 h->forced_local = 0;
1193 /* FIXME: Should we check type and size for protected symbol? */
1203 /* If the old symbol was undefined before, then it will still be
1204 on the undefs list. If the new symbol is undefined or
1205 common, we can't make it bfd_link_hash_new here, because new
1206 undefined or common symbols will be added to the undefs list
1207 by _bfd_generic_link_add_one_symbol. Symbols may not be
1208 added twice to the undefs list. Also, if the new symbol is
1209 undefweak then we don't want to lose the strong undef. */
1210 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1212 h->root.type = bfd_link_hash_undefined;
1213 h->root.u.undef.abfd = abfd;
1217 h->root.type = bfd_link_hash_new;
1218 h->root.u.undef.abfd = NULL;
1221 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1223 /* If the new symbol is hidden or internal, completely undo
1224 any dynamic link state. */
1225 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1226 h->forced_local = 0;
1232 /* FIXME: Should we check type and size for protected symbol? */
1238 /* If a new weak symbol definition comes from a regular file and the
1239 old symbol comes from a dynamic library, we treat the new one as
1240 strong. Similarly, an old weak symbol definition from a regular
1241 file is treated as strong when the new symbol comes from a dynamic
1242 library. Further, an old weak symbol from a dynamic library is
1243 treated as strong if the new symbol is from a dynamic library.
1244 This reflects the way glibc's ld.so works.
1246 Do this before setting *type_change_ok or *size_change_ok so that
1247 we warn properly when dynamic library symbols are overridden. */
1249 if (newdef && !newdyn && olddyn)
1251 if (olddef && newdyn)
1254 /* Allow changes between different types of function symbol. */
1255 if (newfunc && oldfunc)
1256 *type_change_ok = TRUE;
1258 /* It's OK to change the type if either the existing symbol or the
1259 new symbol is weak. A type change is also OK if the old symbol
1260 is undefined and the new symbol is defined. */
1265 && h->root.type == bfd_link_hash_undefined))
1266 *type_change_ok = TRUE;
1268 /* It's OK to change the size if either the existing symbol or the
1269 new symbol is weak, or if the old symbol is undefined. */
1272 || h->root.type == bfd_link_hash_undefined)
1273 *size_change_ok = TRUE;
1275 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1276 symbol, respectively, appears to be a common symbol in a dynamic
1277 object. If a symbol appears in an uninitialized section, and is
1278 not weak, and is not a function, then it may be a common symbol
1279 which was resolved when the dynamic object was created. We want
1280 to treat such symbols specially, because they raise special
1281 considerations when setting the symbol size: if the symbol
1282 appears as a common symbol in a regular object, and the size in
1283 the regular object is larger, we must make sure that we use the
1284 larger size. This problematic case can always be avoided in C,
1285 but it must be handled correctly when using Fortran shared
1288 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1289 likewise for OLDDYNCOMMON and OLDDEF.
1291 Note that this test is just a heuristic, and that it is quite
1292 possible to have an uninitialized symbol in a shared object which
1293 is really a definition, rather than a common symbol. This could
1294 lead to some minor confusion when the symbol really is a common
1295 symbol in some regular object. However, I think it will be
1301 && (sec->flags & SEC_ALLOC) != 0
1302 && (sec->flags & SEC_LOAD) == 0
1305 newdyncommon = TRUE;
1307 newdyncommon = FALSE;
1311 && h->root.type == bfd_link_hash_defined
1313 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1314 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1317 olddyncommon = TRUE;
1319 olddyncommon = FALSE;
1321 /* We now know everything about the old and new symbols. We ask the
1322 backend to check if we can merge them. */
1323 if (bed->merge_symbol != NULL)
1325 if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
1330 /* If both the old and the new symbols look like common symbols in a
1331 dynamic object, set the size of the symbol to the larger of the
1336 && sym->st_size != h->size)
1338 /* Since we think we have two common symbols, issue a multiple
1339 common warning if desired. Note that we only warn if the
1340 size is different. If the size is the same, we simply let
1341 the old symbol override the new one as normally happens with
1342 symbols defined in dynamic objects. */
1344 if (! ((*info->callbacks->multiple_common)
1345 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1348 if (sym->st_size > h->size)
1349 h->size = sym->st_size;
1351 *size_change_ok = TRUE;
1354 /* If we are looking at a dynamic object, and we have found a
1355 definition, we need to see if the symbol was already defined by
1356 some other object. If so, we want to use the existing
1357 definition, and we do not want to report a multiple symbol
1358 definition error; we do this by clobbering *PSEC to be
1359 bfd_und_section_ptr.
1361 We treat a common symbol as a definition if the symbol in the
1362 shared library is a function, since common symbols always
1363 represent variables; this can cause confusion in principle, but
1364 any such confusion would seem to indicate an erroneous program or
1365 shared library. We also permit a common symbol in a regular
1366 object to override a weak symbol in a shared object. */
1371 || (h->root.type == bfd_link_hash_common
1372 && (newweak || newfunc))))
1376 newdyncommon = FALSE;
1378 *psec = sec = bfd_und_section_ptr;
1379 *size_change_ok = TRUE;
1381 /* If we get here when the old symbol is a common symbol, then
1382 we are explicitly letting it override a weak symbol or
1383 function in a dynamic object, and we don't want to warn about
1384 a type change. If the old symbol is a defined symbol, a type
1385 change warning may still be appropriate. */
1387 if (h->root.type == bfd_link_hash_common)
1388 *type_change_ok = TRUE;
1391 /* Handle the special case of an old common symbol merging with a
1392 new symbol which looks like a common symbol in a shared object.
1393 We change *PSEC and *PVALUE to make the new symbol look like a
1394 common symbol, and let _bfd_generic_link_add_one_symbol do the
1398 && h->root.type == bfd_link_hash_common)
1402 newdyncommon = FALSE;
1403 *pvalue = sym->st_size;
1404 *psec = sec = bed->common_section (oldsec);
1405 *size_change_ok = TRUE;
1408 /* Skip weak definitions of symbols that are already defined. */
1409 if (newdef && olddef && newweak)
1411 /* Don't skip new non-IR weak syms. */
1412 if (!(oldbfd != NULL
1413 && (oldbfd->flags & BFD_PLUGIN) != 0
1414 && (abfd->flags & BFD_PLUGIN) == 0))
1420 /* Merge st_other. If the symbol already has a dynamic index,
1421 but visibility says it should not be visible, turn it into a
1423 elf_merge_st_other (abfd, h, sym, sec, newdef, newdyn);
1424 if (h->dynindx != -1)
1425 switch (ELF_ST_VISIBILITY (h->other))
1429 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1434 /* If the old symbol is from a dynamic object, and the new symbol is
1435 a definition which is not from a dynamic object, then the new
1436 symbol overrides the old symbol. Symbols from regular files
1437 always take precedence over symbols from dynamic objects, even if
1438 they are defined after the dynamic object in the link.
1440 As above, we again permit a common symbol in a regular object to
1441 override a definition in a shared object if the shared object
1442 symbol is a function or is weak. */
1447 || (bfd_is_com_section (sec)
1448 && (oldweak || oldfunc)))
1453 /* Change the hash table entry to undefined, and let
1454 _bfd_generic_link_add_one_symbol do the right thing with the
1457 h->root.type = bfd_link_hash_undefined;
1458 h->root.u.undef.abfd = h->root.u.def.section->owner;
1459 *size_change_ok = TRUE;
1462 olddyncommon = FALSE;
1464 /* We again permit a type change when a common symbol may be
1465 overriding a function. */
1467 if (bfd_is_com_section (sec))
1471 /* If a common symbol overrides a function, make sure
1472 that it isn't defined dynamically nor has type
1475 h->type = STT_NOTYPE;
1477 *type_change_ok = TRUE;
1480 if (hi->root.type == bfd_link_hash_indirect)
1483 /* This union may have been set to be non-NULL when this symbol
1484 was seen in a dynamic object. We must force the union to be
1485 NULL, so that it is correct for a regular symbol. */
1486 h->verinfo.vertree = NULL;
1489 /* Handle the special case of a new common symbol merging with an
1490 old symbol that looks like it might be a common symbol defined in
1491 a shared object. Note that we have already handled the case in
1492 which a new common symbol should simply override the definition
1493 in the shared library. */
1496 && bfd_is_com_section (sec)
1499 /* It would be best if we could set the hash table entry to a
1500 common symbol, but we don't know what to use for the section
1501 or the alignment. */
1502 if (! ((*info->callbacks->multiple_common)
1503 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1506 /* If the presumed common symbol in the dynamic object is
1507 larger, pretend that the new symbol has its size. */
1509 if (h->size > *pvalue)
1512 /* We need to remember the alignment required by the symbol
1513 in the dynamic object. */
1514 BFD_ASSERT (pold_alignment);
1515 *pold_alignment = h->root.u.def.section->alignment_power;
1518 olddyncommon = FALSE;
1520 h->root.type = bfd_link_hash_undefined;
1521 h->root.u.undef.abfd = h->root.u.def.section->owner;
1523 *size_change_ok = TRUE;
1524 *type_change_ok = TRUE;
1526 if (hi->root.type == bfd_link_hash_indirect)
1529 h->verinfo.vertree = NULL;
1534 /* Handle the case where we had a versioned symbol in a dynamic
1535 library and now find a definition in a normal object. In this
1536 case, we make the versioned symbol point to the normal one. */
1537 flip->root.type = h->root.type;
1538 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1539 h->root.type = bfd_link_hash_indirect;
1540 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1541 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1545 flip->ref_dynamic = 1;
1552 /* This function is called to create an indirect symbol from the
1553 default for the symbol with the default version if needed. The
1554 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1555 set DYNSYM if the new indirect symbol is dynamic. */
1558 _bfd_elf_add_default_symbol (bfd *abfd,
1559 struct bfd_link_info *info,
1560 struct elf_link_hash_entry *h,
1562 Elf_Internal_Sym *sym,
1566 bfd_boolean *dynsym)
1568 bfd_boolean type_change_ok;
1569 bfd_boolean size_change_ok;
1572 struct elf_link_hash_entry *hi;
1573 struct bfd_link_hash_entry *bh;
1574 const struct elf_backend_data *bed;
1575 bfd_boolean collect;
1576 bfd_boolean dynamic;
1577 bfd_boolean override;
1579 size_t len, shortlen;
1582 /* If this symbol has a version, and it is the default version, we
1583 create an indirect symbol from the default name to the fully
1584 decorated name. This will cause external references which do not
1585 specify a version to be bound to this version of the symbol. */
1586 p = strchr (name, ELF_VER_CHR);
1587 if (p == NULL || p[1] != ELF_VER_CHR)
1590 bed = get_elf_backend_data (abfd);
1591 collect = bed->collect;
1592 dynamic = (abfd->flags & DYNAMIC) != 0;
1594 shortlen = p - name;
1595 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1596 if (shortname == NULL)
1598 memcpy (shortname, name, shortlen);
1599 shortname[shortlen] = '\0';
1601 /* We are going to create a new symbol. Merge it with any existing
1602 symbol with this name. For the purposes of the merge, act as
1603 though we were defining the symbol we just defined, although we
1604 actually going to define an indirect symbol. */
1605 type_change_ok = FALSE;
1606 size_change_ok = FALSE;
1608 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1609 &hi, poldbfd, NULL, NULL, &skip, &override,
1610 &type_change_ok, &size_change_ok))
1619 if (! (_bfd_generic_link_add_one_symbol
1620 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1621 0, name, FALSE, collect, &bh)))
1623 hi = (struct elf_link_hash_entry *) bh;
1627 /* In this case the symbol named SHORTNAME is overriding the
1628 indirect symbol we want to add. We were planning on making
1629 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1630 is the name without a version. NAME is the fully versioned
1631 name, and it is the default version.
1633 Overriding means that we already saw a definition for the
1634 symbol SHORTNAME in a regular object, and it is overriding
1635 the symbol defined in the dynamic object.
1637 When this happens, we actually want to change NAME, the
1638 symbol we just added, to refer to SHORTNAME. This will cause
1639 references to NAME in the shared object to become references
1640 to SHORTNAME in the regular object. This is what we expect
1641 when we override a function in a shared object: that the
1642 references in the shared object will be mapped to the
1643 definition in the regular object. */
1645 while (hi->root.type == bfd_link_hash_indirect
1646 || hi->root.type == bfd_link_hash_warning)
1647 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1649 h->root.type = bfd_link_hash_indirect;
1650 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1654 hi->ref_dynamic = 1;
1658 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1663 /* Now set HI to H, so that the following code will set the
1664 other fields correctly. */
1668 /* Check if HI is a warning symbol. */
1669 if (hi->root.type == bfd_link_hash_warning)
1670 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1672 /* If there is a duplicate definition somewhere, then HI may not
1673 point to an indirect symbol. We will have reported an error to
1674 the user in that case. */
1676 if (hi->root.type == bfd_link_hash_indirect)
1678 struct elf_link_hash_entry *ht;
1680 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1681 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1683 /* A reference to the SHORTNAME symbol from a dynamic library
1684 will be satisfied by the versioned symbol at runtime. In
1685 effect, we have a reference to the versioned symbol. */
1686 ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1687 hi->dynamic_def |= ht->dynamic_def;
1689 /* See if the new flags lead us to realize that the symbol must
1695 if (! info->executable
1702 if (hi->ref_regular)
1708 /* We also need to define an indirection from the nondefault version
1712 len = strlen (name);
1713 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1714 if (shortname == NULL)
1716 memcpy (shortname, name, shortlen);
1717 memcpy (shortname + shortlen, p + 1, len - shortlen);
1719 /* Once again, merge with any existing symbol. */
1720 type_change_ok = FALSE;
1721 size_change_ok = FALSE;
1723 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1724 &hi, poldbfd, NULL, NULL, &skip, &override,
1725 &type_change_ok, &size_change_ok))
1733 /* Here SHORTNAME is a versioned name, so we don't expect to see
1734 the type of override we do in the case above unless it is
1735 overridden by a versioned definition. */
1736 if (hi->root.type != bfd_link_hash_defined
1737 && hi->root.type != bfd_link_hash_defweak)
1738 (*_bfd_error_handler)
1739 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1745 if (! (_bfd_generic_link_add_one_symbol
1746 (info, abfd, shortname, BSF_INDIRECT,
1747 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1749 hi = (struct elf_link_hash_entry *) bh;
1751 /* If there is a duplicate definition somewhere, then HI may not
1752 point to an indirect symbol. We will have reported an error
1753 to the user in that case. */
1755 if (hi->root.type == bfd_link_hash_indirect)
1757 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1758 h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1759 hi->dynamic_def |= h->dynamic_def;
1761 /* See if the new flags lead us to realize that the symbol
1767 if (! info->executable
1773 if (hi->ref_regular)
1783 /* This routine is used to export all defined symbols into the dynamic
1784 symbol table. It is called via elf_link_hash_traverse. */
1787 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1789 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1791 /* Ignore indirect symbols. These are added by the versioning code. */
1792 if (h->root.type == bfd_link_hash_indirect)
1795 /* Ignore this if we won't export it. */
1796 if (!eif->info->export_dynamic && !h->dynamic)
1799 if (h->dynindx == -1
1800 && (h->def_regular || h->ref_regular)
1801 && ! bfd_hide_sym_by_version (eif->info->version_info,
1802 h->root.root.string))
1804 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1814 /* Look through the symbols which are defined in other shared
1815 libraries and referenced here. Update the list of version
1816 dependencies. This will be put into the .gnu.version_r section.
1817 This function is called via elf_link_hash_traverse. */
1820 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1823 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1824 Elf_Internal_Verneed *t;
1825 Elf_Internal_Vernaux *a;
1828 /* We only care about symbols defined in shared objects with version
1833 || h->verinfo.verdef == NULL
1834 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
1835 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
1838 /* See if we already know about this version. */
1839 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1843 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1846 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1847 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1853 /* This is a new version. Add it to tree we are building. */
1858 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1861 rinfo->failed = TRUE;
1865 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1866 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1867 elf_tdata (rinfo->info->output_bfd)->verref = t;
1871 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1874 rinfo->failed = TRUE;
1878 /* Note that we are copying a string pointer here, and testing it
1879 above. If bfd_elf_string_from_elf_section is ever changed to
1880 discard the string data when low in memory, this will have to be
1882 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1884 a->vna_flags = h->verinfo.verdef->vd_flags;
1885 a->vna_nextptr = t->vn_auxptr;
1887 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1890 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1897 /* Figure out appropriate versions for all the symbols. We may not
1898 have the version number script until we have read all of the input
1899 files, so until that point we don't know which symbols should be
1900 local. This function is called via elf_link_hash_traverse. */
1903 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1905 struct elf_info_failed *sinfo;
1906 struct bfd_link_info *info;
1907 const struct elf_backend_data *bed;
1908 struct elf_info_failed eif;
1912 sinfo = (struct elf_info_failed *) data;
1915 /* Fix the symbol flags. */
1918 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1921 sinfo->failed = TRUE;
1925 /* We only need version numbers for symbols defined in regular
1927 if (!h->def_regular)
1930 bed = get_elf_backend_data (info->output_bfd);
1931 p = strchr (h->root.root.string, ELF_VER_CHR);
1932 if (p != NULL && h->verinfo.vertree == NULL)
1934 struct bfd_elf_version_tree *t;
1939 /* There are two consecutive ELF_VER_CHR characters if this is
1940 not a hidden symbol. */
1942 if (*p == ELF_VER_CHR)
1948 /* If there is no version string, we can just return out. */
1956 /* Look for the version. If we find it, it is no longer weak. */
1957 for (t = sinfo->info->version_info; t != NULL; t = t->next)
1959 if (strcmp (t->name, p) == 0)
1963 struct bfd_elf_version_expr *d;
1965 len = p - h->root.root.string;
1966 alc = (char *) bfd_malloc (len);
1969 sinfo->failed = TRUE;
1972 memcpy (alc, h->root.root.string, len - 1);
1973 alc[len - 1] = '\0';
1974 if (alc[len - 2] == ELF_VER_CHR)
1975 alc[len - 2] = '\0';
1977 h->verinfo.vertree = t;
1981 if (t->globals.list != NULL)
1982 d = (*t->match) (&t->globals, NULL, alc);
1984 /* See if there is anything to force this symbol to
1986 if (d == NULL && t->locals.list != NULL)
1988 d = (*t->match) (&t->locals, NULL, alc);
1991 && ! info->export_dynamic)
1992 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2000 /* If we are building an application, we need to create a
2001 version node for this version. */
2002 if (t == NULL && info->executable)
2004 struct bfd_elf_version_tree **pp;
2007 /* If we aren't going to export this symbol, we don't need
2008 to worry about it. */
2009 if (h->dynindx == -1)
2013 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2016 sinfo->failed = TRUE;
2021 t->name_indx = (unsigned int) -1;
2025 /* Don't count anonymous version tag. */
2026 if (sinfo->info->version_info != NULL
2027 && sinfo->info->version_info->vernum == 0)
2029 for (pp = &sinfo->info->version_info;
2033 t->vernum = version_index;
2037 h->verinfo.vertree = t;
2041 /* We could not find the version for a symbol when
2042 generating a shared archive. Return an error. */
2043 (*_bfd_error_handler)
2044 (_("%B: version node not found for symbol %s"),
2045 info->output_bfd, h->root.root.string);
2046 bfd_set_error (bfd_error_bad_value);
2047 sinfo->failed = TRUE;
2055 /* If we don't have a version for this symbol, see if we can find
2057 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2062 = bfd_find_version_for_sym (sinfo->info->version_info,
2063 h->root.root.string, &hide);
2064 if (h->verinfo.vertree != NULL && hide)
2065 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2071 /* Read and swap the relocs from the section indicated by SHDR. This
2072 may be either a REL or a RELA section. The relocations are
2073 translated into RELA relocations and stored in INTERNAL_RELOCS,
2074 which should have already been allocated to contain enough space.
2075 The EXTERNAL_RELOCS are a buffer where the external form of the
2076 relocations should be stored.
2078 Returns FALSE if something goes wrong. */
2081 elf_link_read_relocs_from_section (bfd *abfd,
2083 Elf_Internal_Shdr *shdr,
2084 void *external_relocs,
2085 Elf_Internal_Rela *internal_relocs)
2087 const struct elf_backend_data *bed;
2088 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2089 const bfd_byte *erela;
2090 const bfd_byte *erelaend;
2091 Elf_Internal_Rela *irela;
2092 Elf_Internal_Shdr *symtab_hdr;
2095 /* Position ourselves at the start of the section. */
2096 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2099 /* Read the relocations. */
2100 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2103 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2104 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2106 bed = get_elf_backend_data (abfd);
2108 /* Convert the external relocations to the internal format. */
2109 if (shdr->sh_entsize == bed->s->sizeof_rel)
2110 swap_in = bed->s->swap_reloc_in;
2111 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2112 swap_in = bed->s->swap_reloca_in;
2115 bfd_set_error (bfd_error_wrong_format);
2119 erela = (const bfd_byte *) external_relocs;
2120 erelaend = erela + shdr->sh_size;
2121 irela = internal_relocs;
2122 while (erela < erelaend)
2126 (*swap_in) (abfd, erela, irela);
2127 r_symndx = ELF32_R_SYM (irela->r_info);
2128 if (bed->s->arch_size == 64)
2132 if ((size_t) r_symndx >= nsyms)
2134 (*_bfd_error_handler)
2135 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2136 " for offset 0x%lx in section `%A'"),
2138 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2139 bfd_set_error (bfd_error_bad_value);
2143 else if (r_symndx != STN_UNDEF)
2145 (*_bfd_error_handler)
2146 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2147 " when the object file has no symbol table"),
2149 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2150 bfd_set_error (bfd_error_bad_value);
2153 irela += bed->s->int_rels_per_ext_rel;
2154 erela += shdr->sh_entsize;
2160 /* Read and swap the relocs for a section O. They may have been
2161 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2162 not NULL, they are used as buffers to read into. They are known to
2163 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2164 the return value is allocated using either malloc or bfd_alloc,
2165 according to the KEEP_MEMORY argument. If O has two relocation
2166 sections (both REL and RELA relocations), then the REL_HDR
2167 relocations will appear first in INTERNAL_RELOCS, followed by the
2168 RELA_HDR relocations. */
2171 _bfd_elf_link_read_relocs (bfd *abfd,
2173 void *external_relocs,
2174 Elf_Internal_Rela *internal_relocs,
2175 bfd_boolean keep_memory)
2177 void *alloc1 = NULL;
2178 Elf_Internal_Rela *alloc2 = NULL;
2179 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2180 struct bfd_elf_section_data *esdo = elf_section_data (o);
2181 Elf_Internal_Rela *internal_rela_relocs;
2183 if (esdo->relocs != NULL)
2184 return esdo->relocs;
2186 if (o->reloc_count == 0)
2189 if (internal_relocs == NULL)
2193 size = o->reloc_count;
2194 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2196 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2198 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2199 if (internal_relocs == NULL)
2203 if (external_relocs == NULL)
2205 bfd_size_type size = 0;
2208 size += esdo->rel.hdr->sh_size;
2210 size += esdo->rela.hdr->sh_size;
2212 alloc1 = bfd_malloc (size);
2215 external_relocs = alloc1;
2218 internal_rela_relocs = internal_relocs;
2221 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2225 external_relocs = (((bfd_byte *) external_relocs)
2226 + esdo->rel.hdr->sh_size);
2227 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2228 * bed->s->int_rels_per_ext_rel);
2232 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2234 internal_rela_relocs)))
2237 /* Cache the results for next time, if we can. */
2239 esdo->relocs = internal_relocs;
2244 /* Don't free alloc2, since if it was allocated we are passing it
2245 back (under the name of internal_relocs). */
2247 return internal_relocs;
2255 bfd_release (abfd, alloc2);
2262 /* Compute the size of, and allocate space for, REL_HDR which is the
2263 section header for a section containing relocations for O. */
2266 _bfd_elf_link_size_reloc_section (bfd *abfd,
2267 struct bfd_elf_section_reloc_data *reldata)
2269 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2271 /* That allows us to calculate the size of the section. */
2272 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2274 /* The contents field must last into write_object_contents, so we
2275 allocate it with bfd_alloc rather than malloc. Also since we
2276 cannot be sure that the contents will actually be filled in,
2277 we zero the allocated space. */
2278 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2279 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2282 if (reldata->hashes == NULL && reldata->count)
2284 struct elf_link_hash_entry **p;
2286 p = (struct elf_link_hash_entry **)
2287 bfd_zmalloc (reldata->count * sizeof (struct elf_link_hash_entry *));
2291 reldata->hashes = p;
2297 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2298 originated from the section given by INPUT_REL_HDR) to the
2302 _bfd_elf_link_output_relocs (bfd *output_bfd,
2303 asection *input_section,
2304 Elf_Internal_Shdr *input_rel_hdr,
2305 Elf_Internal_Rela *internal_relocs,
2306 struct elf_link_hash_entry **rel_hash
2309 Elf_Internal_Rela *irela;
2310 Elf_Internal_Rela *irelaend;
2312 struct bfd_elf_section_reloc_data *output_reldata;
2313 asection *output_section;
2314 const struct elf_backend_data *bed;
2315 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2316 struct bfd_elf_section_data *esdo;
2318 output_section = input_section->output_section;
2320 bed = get_elf_backend_data (output_bfd);
2321 esdo = elf_section_data (output_section);
2322 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2324 output_reldata = &esdo->rel;
2325 swap_out = bed->s->swap_reloc_out;
2327 else if (esdo->rela.hdr
2328 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2330 output_reldata = &esdo->rela;
2331 swap_out = bed->s->swap_reloca_out;
2335 (*_bfd_error_handler)
2336 (_("%B: relocation size mismatch in %B section %A"),
2337 output_bfd, input_section->owner, input_section);
2338 bfd_set_error (bfd_error_wrong_format);
2342 erel = output_reldata->hdr->contents;
2343 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2344 irela = internal_relocs;
2345 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2346 * bed->s->int_rels_per_ext_rel);
2347 while (irela < irelaend)
2349 (*swap_out) (output_bfd, irela, erel);
2350 irela += bed->s->int_rels_per_ext_rel;
2351 erel += input_rel_hdr->sh_entsize;
2354 /* Bump the counter, so that we know where to add the next set of
2356 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2361 /* Make weak undefined symbols in PIE dynamic. */
2364 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2365 struct elf_link_hash_entry *h)
2369 && h->root.type == bfd_link_hash_undefweak)
2370 return bfd_elf_link_record_dynamic_symbol (info, h);
2375 /* Fix up the flags for a symbol. This handles various cases which
2376 can only be fixed after all the input files are seen. This is
2377 currently called by both adjust_dynamic_symbol and
2378 assign_sym_version, which is unnecessary but perhaps more robust in
2379 the face of future changes. */
2382 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2383 struct elf_info_failed *eif)
2385 const struct elf_backend_data *bed;
2387 /* If this symbol was mentioned in a non-ELF file, try to set
2388 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2389 permit a non-ELF file to correctly refer to a symbol defined in
2390 an ELF dynamic object. */
2393 while (h->root.type == bfd_link_hash_indirect)
2394 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2396 if (h->root.type != bfd_link_hash_defined
2397 && h->root.type != bfd_link_hash_defweak)
2400 h->ref_regular_nonweak = 1;
2404 if (h->root.u.def.section->owner != NULL
2405 && (bfd_get_flavour (h->root.u.def.section->owner)
2406 == bfd_target_elf_flavour))
2409 h->ref_regular_nonweak = 1;
2415 if (h->dynindx == -1
2419 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2428 /* Unfortunately, NON_ELF is only correct if the symbol
2429 was first seen in a non-ELF file. Fortunately, if the symbol
2430 was first seen in an ELF file, we're probably OK unless the
2431 symbol was defined in a non-ELF file. Catch that case here.
2432 FIXME: We're still in trouble if the symbol was first seen in
2433 a dynamic object, and then later in a non-ELF regular object. */
2434 if ((h->root.type == bfd_link_hash_defined
2435 || h->root.type == bfd_link_hash_defweak)
2437 && (h->root.u.def.section->owner != NULL
2438 ? (bfd_get_flavour (h->root.u.def.section->owner)
2439 != bfd_target_elf_flavour)
2440 : (bfd_is_abs_section (h->root.u.def.section)
2441 && !h->def_dynamic)))
2445 /* Backend specific symbol fixup. */
2446 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2447 if (bed->elf_backend_fixup_symbol
2448 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2451 /* If this is a final link, and the symbol was defined as a common
2452 symbol in a regular object file, and there was no definition in
2453 any dynamic object, then the linker will have allocated space for
2454 the symbol in a common section but the DEF_REGULAR
2455 flag will not have been set. */
2456 if (h->root.type == bfd_link_hash_defined
2460 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2463 /* If -Bsymbolic was used (which means to bind references to global
2464 symbols to the definition within the shared object), and this
2465 symbol was defined in a regular object, then it actually doesn't
2466 need a PLT entry. Likewise, if the symbol has non-default
2467 visibility. If the symbol has hidden or internal visibility, we
2468 will force it local. */
2470 && eif->info->shared
2471 && is_elf_hash_table (eif->info->hash)
2472 && (SYMBOLIC_BIND (eif->info, h)
2473 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2476 bfd_boolean force_local;
2478 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2479 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2480 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2483 /* If a weak undefined symbol has non-default visibility, we also
2484 hide it from the dynamic linker. */
2485 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2486 && h->root.type == bfd_link_hash_undefweak)
2487 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2489 /* If this is a weak defined symbol in a dynamic object, and we know
2490 the real definition in the dynamic object, copy interesting flags
2491 over to the real definition. */
2492 if (h->u.weakdef != NULL)
2494 /* If the real definition is defined by a regular object file,
2495 don't do anything special. See the longer description in
2496 _bfd_elf_adjust_dynamic_symbol, below. */
2497 if (h->u.weakdef->def_regular)
2498 h->u.weakdef = NULL;
2501 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2503 while (h->root.type == bfd_link_hash_indirect)
2504 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2506 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2507 || h->root.type == bfd_link_hash_defweak);
2508 BFD_ASSERT (weakdef->def_dynamic);
2509 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2510 || weakdef->root.type == bfd_link_hash_defweak);
2511 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2518 /* Make the backend pick a good value for a dynamic symbol. This is
2519 called via elf_link_hash_traverse, and also calls itself
2523 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2525 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2527 const struct elf_backend_data *bed;
2529 if (! is_elf_hash_table (eif->info->hash))
2532 /* Ignore indirect symbols. These are added by the versioning code. */
2533 if (h->root.type == bfd_link_hash_indirect)
2536 /* Fix the symbol flags. */
2537 if (! _bfd_elf_fix_symbol_flags (h, eif))
2540 /* If this symbol does not require a PLT entry, and it is not
2541 defined by a dynamic object, or is not referenced by a regular
2542 object, ignore it. We do have to handle a weak defined symbol,
2543 even if no regular object refers to it, if we decided to add it
2544 to the dynamic symbol table. FIXME: Do we normally need to worry
2545 about symbols which are defined by one dynamic object and
2546 referenced by another one? */
2548 && h->type != STT_GNU_IFUNC
2552 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2554 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2558 /* If we've already adjusted this symbol, don't do it again. This
2559 can happen via a recursive call. */
2560 if (h->dynamic_adjusted)
2563 /* Don't look at this symbol again. Note that we must set this
2564 after checking the above conditions, because we may look at a
2565 symbol once, decide not to do anything, and then get called
2566 recursively later after REF_REGULAR is set below. */
2567 h->dynamic_adjusted = 1;
2569 /* If this is a weak definition, and we know a real definition, and
2570 the real symbol is not itself defined by a regular object file,
2571 then get a good value for the real definition. We handle the
2572 real symbol first, for the convenience of the backend routine.
2574 Note that there is a confusing case here. If the real definition
2575 is defined by a regular object file, we don't get the real symbol
2576 from the dynamic object, but we do get the weak symbol. If the
2577 processor backend uses a COPY reloc, then if some routine in the
2578 dynamic object changes the real symbol, we will not see that
2579 change in the corresponding weak symbol. This is the way other
2580 ELF linkers work as well, and seems to be a result of the shared
2583 I will clarify this issue. Most SVR4 shared libraries define the
2584 variable _timezone and define timezone as a weak synonym. The
2585 tzset call changes _timezone. If you write
2586 extern int timezone;
2588 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2589 you might expect that, since timezone is a synonym for _timezone,
2590 the same number will print both times. However, if the processor
2591 backend uses a COPY reloc, then actually timezone will be copied
2592 into your process image, and, since you define _timezone
2593 yourself, _timezone will not. Thus timezone and _timezone will
2594 wind up at different memory locations. The tzset call will set
2595 _timezone, leaving timezone unchanged. */
2597 if (h->u.weakdef != NULL)
2599 /* If we get to this point, there is an implicit reference to
2600 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2601 h->u.weakdef->ref_regular = 1;
2603 /* Ensure that the backend adjust_dynamic_symbol function sees
2604 H->U.WEAKDEF before H by recursively calling ourselves. */
2605 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2609 /* If a symbol has no type and no size and does not require a PLT
2610 entry, then we are probably about to do the wrong thing here: we
2611 are probably going to create a COPY reloc for an empty object.
2612 This case can arise when a shared object is built with assembly
2613 code, and the assembly code fails to set the symbol type. */
2615 && h->type == STT_NOTYPE
2617 (*_bfd_error_handler)
2618 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2619 h->root.root.string);
2621 dynobj = elf_hash_table (eif->info)->dynobj;
2622 bed = get_elf_backend_data (dynobj);
2624 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2633 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2637 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info,
2638 struct elf_link_hash_entry *h,
2641 unsigned int power_of_two;
2643 asection *sec = h->root.u.def.section;
2645 /* The section aligment of definition is the maximum alignment
2646 requirement of symbols defined in the section. Since we don't
2647 know the symbol alignment requirement, we start with the
2648 maximum alignment and check low bits of the symbol address
2649 for the minimum alignment. */
2650 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2651 mask = ((bfd_vma) 1 << power_of_two) - 1;
2652 while ((h->root.u.def.value & mask) != 0)
2658 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2661 /* Adjust the section alignment if needed. */
2662 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2667 /* We make sure that the symbol will be aligned properly. */
2668 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2670 /* Define the symbol as being at this point in DYNBSS. */
2671 h->root.u.def.section = dynbss;
2672 h->root.u.def.value = dynbss->size;
2674 /* Increment the size of DYNBSS to make room for the symbol. */
2675 dynbss->size += h->size;
2677 if (h->protected_def)
2678 info->callbacks->einfo
2679 (_("%P: copy reloc against protected `%T' is dangerous\n"),
2680 h->root.root.string);
2685 /* Adjust all external symbols pointing into SEC_MERGE sections
2686 to reflect the object merging within the sections. */
2689 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2693 if ((h->root.type == bfd_link_hash_defined
2694 || h->root.type == bfd_link_hash_defweak)
2695 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2696 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2698 bfd *output_bfd = (bfd *) data;
2700 h->root.u.def.value =
2701 _bfd_merged_section_offset (output_bfd,
2702 &h->root.u.def.section,
2703 elf_section_data (sec)->sec_info,
2704 h->root.u.def.value);
2710 /* Returns false if the symbol referred to by H should be considered
2711 to resolve local to the current module, and true if it should be
2712 considered to bind dynamically. */
2715 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2716 struct bfd_link_info *info,
2717 bfd_boolean not_local_protected)
2719 bfd_boolean binding_stays_local_p;
2720 const struct elf_backend_data *bed;
2721 struct elf_link_hash_table *hash_table;
2726 while (h->root.type == bfd_link_hash_indirect
2727 || h->root.type == bfd_link_hash_warning)
2728 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2730 /* If it was forced local, then clearly it's not dynamic. */
2731 if (h->dynindx == -1)
2733 if (h->forced_local)
2736 /* Identify the cases where name binding rules say that a
2737 visible symbol resolves locally. */
2738 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2740 switch (ELF_ST_VISIBILITY (h->other))
2747 hash_table = elf_hash_table (info);
2748 if (!is_elf_hash_table (hash_table))
2751 bed = get_elf_backend_data (hash_table->dynobj);
2753 /* Proper resolution for function pointer equality may require
2754 that these symbols perhaps be resolved dynamically, even though
2755 we should be resolving them to the current module. */
2756 if (!not_local_protected || !bed->is_function_type (h->type))
2757 binding_stays_local_p = TRUE;
2764 /* If it isn't defined locally, then clearly it's dynamic. */
2765 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2768 /* Otherwise, the symbol is dynamic if binding rules don't tell
2769 us that it remains local. */
2770 return !binding_stays_local_p;
2773 /* Return true if the symbol referred to by H should be considered
2774 to resolve local to the current module, and false otherwise. Differs
2775 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2776 undefined symbols. The two functions are virtually identical except
2777 for the place where forced_local and dynindx == -1 are tested. If
2778 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2779 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2780 the symbol is local only for defined symbols.
2781 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2782 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2783 treatment of undefined weak symbols. For those that do not make
2784 undefined weak symbols dynamic, both functions may return false. */
2787 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2788 struct bfd_link_info *info,
2789 bfd_boolean local_protected)
2791 const struct elf_backend_data *bed;
2792 struct elf_link_hash_table *hash_table;
2794 /* If it's a local sym, of course we resolve locally. */
2798 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2799 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2800 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2803 /* Common symbols that become definitions don't get the DEF_REGULAR
2804 flag set, so test it first, and don't bail out. */
2805 if (ELF_COMMON_DEF_P (h))
2807 /* If we don't have a definition in a regular file, then we can't
2808 resolve locally. The sym is either undefined or dynamic. */
2809 else if (!h->def_regular)
2812 /* Forced local symbols resolve locally. */
2813 if (h->forced_local)
2816 /* As do non-dynamic symbols. */
2817 if (h->dynindx == -1)
2820 /* At this point, we know the symbol is defined and dynamic. In an
2821 executable it must resolve locally, likewise when building symbolic
2822 shared libraries. */
2823 if (info->executable || SYMBOLIC_BIND (info, h))
2826 /* Now deal with defined dynamic symbols in shared libraries. Ones
2827 with default visibility might not resolve locally. */
2828 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2831 hash_table = elf_hash_table (info);
2832 if (!is_elf_hash_table (hash_table))
2835 bed = get_elf_backend_data (hash_table->dynobj);
2837 /* STV_PROTECTED non-function symbols are local. */
2838 if (!bed->is_function_type (h->type))
2841 /* Function pointer equality tests may require that STV_PROTECTED
2842 symbols be treated as dynamic symbols. If the address of a
2843 function not defined in an executable is set to that function's
2844 plt entry in the executable, then the address of the function in
2845 a shared library must also be the plt entry in the executable. */
2846 return local_protected;
2849 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2850 aligned. Returns the first TLS output section. */
2852 struct bfd_section *
2853 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2855 struct bfd_section *sec, *tls;
2856 unsigned int align = 0;
2858 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2859 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2863 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2864 if (sec->alignment_power > align)
2865 align = sec->alignment_power;
2867 elf_hash_table (info)->tls_sec = tls;
2869 /* Ensure the alignment of the first section is the largest alignment,
2870 so that the tls segment starts aligned. */
2872 tls->alignment_power = align;
2877 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2879 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2880 Elf_Internal_Sym *sym)
2882 const struct elf_backend_data *bed;
2884 /* Local symbols do not count, but target specific ones might. */
2885 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2886 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2889 bed = get_elf_backend_data (abfd);
2890 /* Function symbols do not count. */
2891 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2894 /* If the section is undefined, then so is the symbol. */
2895 if (sym->st_shndx == SHN_UNDEF)
2898 /* If the symbol is defined in the common section, then
2899 it is a common definition and so does not count. */
2900 if (bed->common_definition (sym))
2903 /* If the symbol is in a target specific section then we
2904 must rely upon the backend to tell us what it is. */
2905 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2906 /* FIXME - this function is not coded yet:
2908 return _bfd_is_global_symbol_definition (abfd, sym);
2910 Instead for now assume that the definition is not global,
2911 Even if this is wrong, at least the linker will behave
2912 in the same way that it used to do. */
2918 /* Search the symbol table of the archive element of the archive ABFD
2919 whose archive map contains a mention of SYMDEF, and determine if
2920 the symbol is defined in this element. */
2922 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2924 Elf_Internal_Shdr * hdr;
2925 bfd_size_type symcount;
2926 bfd_size_type extsymcount;
2927 bfd_size_type extsymoff;
2928 Elf_Internal_Sym *isymbuf;
2929 Elf_Internal_Sym *isym;
2930 Elf_Internal_Sym *isymend;
2933 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2937 if (! bfd_check_format (abfd, bfd_object))
2940 /* Select the appropriate symbol table. */
2941 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2942 hdr = &elf_tdata (abfd)->symtab_hdr;
2944 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2946 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2948 /* The sh_info field of the symtab header tells us where the
2949 external symbols start. We don't care about the local symbols. */
2950 if (elf_bad_symtab (abfd))
2952 extsymcount = symcount;
2957 extsymcount = symcount - hdr->sh_info;
2958 extsymoff = hdr->sh_info;
2961 if (extsymcount == 0)
2964 /* Read in the symbol table. */
2965 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2967 if (isymbuf == NULL)
2970 /* Scan the symbol table looking for SYMDEF. */
2972 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
2976 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
2981 if (strcmp (name, symdef->name) == 0)
2983 result = is_global_data_symbol_definition (abfd, isym);
2993 /* Add an entry to the .dynamic table. */
2996 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3000 struct elf_link_hash_table *hash_table;
3001 const struct elf_backend_data *bed;
3003 bfd_size_type newsize;
3004 bfd_byte *newcontents;
3005 Elf_Internal_Dyn dyn;
3007 hash_table = elf_hash_table (info);
3008 if (! is_elf_hash_table (hash_table))
3011 bed = get_elf_backend_data (hash_table->dynobj);
3012 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3013 BFD_ASSERT (s != NULL);
3015 newsize = s->size + bed->s->sizeof_dyn;
3016 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3017 if (newcontents == NULL)
3021 dyn.d_un.d_val = val;
3022 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3025 s->contents = newcontents;
3030 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3031 otherwise just check whether one already exists. Returns -1 on error,
3032 1 if a DT_NEEDED tag already exists, and 0 on success. */
3035 elf_add_dt_needed_tag (bfd *abfd,
3036 struct bfd_link_info *info,
3040 struct elf_link_hash_table *hash_table;
3041 bfd_size_type strindex;
3043 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3046 hash_table = elf_hash_table (info);
3047 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3048 if (strindex == (bfd_size_type) -1)
3051 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3054 const struct elf_backend_data *bed;
3057 bed = get_elf_backend_data (hash_table->dynobj);
3058 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3060 for (extdyn = sdyn->contents;
3061 extdyn < sdyn->contents + sdyn->size;
3062 extdyn += bed->s->sizeof_dyn)
3064 Elf_Internal_Dyn dyn;
3066 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3067 if (dyn.d_tag == DT_NEEDED
3068 && dyn.d_un.d_val == strindex)
3070 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3078 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3081 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3085 /* We were just checking for existence of the tag. */
3086 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3092 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3094 for (; needed != NULL; needed = needed->next)
3095 if ((elf_dyn_lib_class (needed->by) & DYN_AS_NEEDED) == 0
3096 && strcmp (soname, needed->name) == 0)
3102 /* Sort symbol by value, section, and size. */
3104 elf_sort_symbol (const void *arg1, const void *arg2)
3106 const struct elf_link_hash_entry *h1;
3107 const struct elf_link_hash_entry *h2;
3108 bfd_signed_vma vdiff;
3110 h1 = *(const struct elf_link_hash_entry **) arg1;
3111 h2 = *(const struct elf_link_hash_entry **) arg2;
3112 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3114 return vdiff > 0 ? 1 : -1;
3117 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3119 return sdiff > 0 ? 1 : -1;
3121 vdiff = h1->size - h2->size;
3122 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3125 /* This function is used to adjust offsets into .dynstr for
3126 dynamic symbols. This is called via elf_link_hash_traverse. */
3129 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3131 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3133 if (h->dynindx != -1)
3134 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3138 /* Assign string offsets in .dynstr, update all structures referencing
3142 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3144 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3145 struct elf_link_local_dynamic_entry *entry;
3146 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3147 bfd *dynobj = hash_table->dynobj;
3150 const struct elf_backend_data *bed;
3153 _bfd_elf_strtab_finalize (dynstr);
3154 size = _bfd_elf_strtab_size (dynstr);
3156 bed = get_elf_backend_data (dynobj);
3157 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3158 BFD_ASSERT (sdyn != NULL);
3160 /* Update all .dynamic entries referencing .dynstr strings. */
3161 for (extdyn = sdyn->contents;
3162 extdyn < sdyn->contents + sdyn->size;
3163 extdyn += bed->s->sizeof_dyn)
3165 Elf_Internal_Dyn dyn;
3167 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3171 dyn.d_un.d_val = size;
3181 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3186 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3189 /* Now update local dynamic symbols. */
3190 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3191 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3192 entry->isym.st_name);
3194 /* And the rest of dynamic symbols. */
3195 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3197 /* Adjust version definitions. */
3198 if (elf_tdata (output_bfd)->cverdefs)
3203 Elf_Internal_Verdef def;
3204 Elf_Internal_Verdaux defaux;
3206 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3210 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3212 p += sizeof (Elf_External_Verdef);
3213 if (def.vd_aux != sizeof (Elf_External_Verdef))
3215 for (i = 0; i < def.vd_cnt; ++i)
3217 _bfd_elf_swap_verdaux_in (output_bfd,
3218 (Elf_External_Verdaux *) p, &defaux);
3219 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3221 _bfd_elf_swap_verdaux_out (output_bfd,
3222 &defaux, (Elf_External_Verdaux *) p);
3223 p += sizeof (Elf_External_Verdaux);
3226 while (def.vd_next);
3229 /* Adjust version references. */
3230 if (elf_tdata (output_bfd)->verref)
3235 Elf_Internal_Verneed need;
3236 Elf_Internal_Vernaux needaux;
3238 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3242 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3244 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3245 _bfd_elf_swap_verneed_out (output_bfd, &need,
3246 (Elf_External_Verneed *) p);
3247 p += sizeof (Elf_External_Verneed);
3248 for (i = 0; i < need.vn_cnt; ++i)
3250 _bfd_elf_swap_vernaux_in (output_bfd,
3251 (Elf_External_Vernaux *) p, &needaux);
3252 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3254 _bfd_elf_swap_vernaux_out (output_bfd,
3256 (Elf_External_Vernaux *) p);
3257 p += sizeof (Elf_External_Vernaux);
3260 while (need.vn_next);
3266 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3267 The default is to only match when the INPUT and OUTPUT are exactly
3271 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3272 const bfd_target *output)
3274 return input == output;
3277 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3278 This version is used when different targets for the same architecture
3279 are virtually identical. */
3282 _bfd_elf_relocs_compatible (const bfd_target *input,
3283 const bfd_target *output)
3285 const struct elf_backend_data *obed, *ibed;
3287 if (input == output)
3290 ibed = xvec_get_elf_backend_data (input);
3291 obed = xvec_get_elf_backend_data (output);
3293 if (ibed->arch != obed->arch)
3296 /* If both backends are using this function, deem them compatible. */
3297 return ibed->relocs_compatible == obed->relocs_compatible;
3300 /* Make a special call to the linker "notice" function to tell it that
3301 we are about to handle an as-needed lib, or have finished
3302 processing the lib. */
3305 _bfd_elf_notice_as_needed (bfd *ibfd,
3306 struct bfd_link_info *info,
3307 enum notice_asneeded_action act)
3309 return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
3312 /* Add symbols from an ELF object file to the linker hash table. */
3315 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3317 Elf_Internal_Ehdr *ehdr;
3318 Elf_Internal_Shdr *hdr;
3319 bfd_size_type symcount;
3320 bfd_size_type extsymcount;
3321 bfd_size_type extsymoff;
3322 struct elf_link_hash_entry **sym_hash;
3323 bfd_boolean dynamic;
3324 Elf_External_Versym *extversym = NULL;
3325 Elf_External_Versym *ever;
3326 struct elf_link_hash_entry *weaks;
3327 struct elf_link_hash_entry **nondeflt_vers = NULL;
3328 bfd_size_type nondeflt_vers_cnt = 0;
3329 Elf_Internal_Sym *isymbuf = NULL;
3330 Elf_Internal_Sym *isym;
3331 Elf_Internal_Sym *isymend;
3332 const struct elf_backend_data *bed;
3333 bfd_boolean add_needed;
3334 struct elf_link_hash_table *htab;
3336 void *alloc_mark = NULL;
3337 struct bfd_hash_entry **old_table = NULL;
3338 unsigned int old_size = 0;
3339 unsigned int old_count = 0;
3340 void *old_tab = NULL;
3342 struct bfd_link_hash_entry *old_undefs = NULL;
3343 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3344 long old_dynsymcount = 0;
3345 bfd_size_type old_dynstr_size = 0;
3348 bfd_boolean just_syms;
3350 htab = elf_hash_table (info);
3351 bed = get_elf_backend_data (abfd);
3353 if ((abfd->flags & DYNAMIC) == 0)
3359 /* You can't use -r against a dynamic object. Also, there's no
3360 hope of using a dynamic object which does not exactly match
3361 the format of the output file. */
3362 if (info->relocatable
3363 || !is_elf_hash_table (htab)
3364 || info->output_bfd->xvec != abfd->xvec)
3366 if (info->relocatable)
3367 bfd_set_error (bfd_error_invalid_operation);
3369 bfd_set_error (bfd_error_wrong_format);
3374 ehdr = elf_elfheader (abfd);
3375 if (info->warn_alternate_em
3376 && bed->elf_machine_code != ehdr->e_machine
3377 && ((bed->elf_machine_alt1 != 0
3378 && ehdr->e_machine == bed->elf_machine_alt1)
3379 || (bed->elf_machine_alt2 != 0
3380 && ehdr->e_machine == bed->elf_machine_alt2)))
3381 info->callbacks->einfo
3382 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3383 ehdr->e_machine, abfd, bed->elf_machine_code);
3385 /* As a GNU extension, any input sections which are named
3386 .gnu.warning.SYMBOL are treated as warning symbols for the given
3387 symbol. This differs from .gnu.warning sections, which generate
3388 warnings when they are included in an output file. */
3389 /* PR 12761: Also generate this warning when building shared libraries. */
3390 for (s = abfd->sections; s != NULL; s = s->next)
3394 name = bfd_get_section_name (abfd, s);
3395 if (CONST_STRNEQ (name, ".gnu.warning."))
3400 name += sizeof ".gnu.warning." - 1;
3402 /* If this is a shared object, then look up the symbol
3403 in the hash table. If it is there, and it is already
3404 been defined, then we will not be using the entry
3405 from this shared object, so we don't need to warn.
3406 FIXME: If we see the definition in a regular object
3407 later on, we will warn, but we shouldn't. The only
3408 fix is to keep track of what warnings we are supposed
3409 to emit, and then handle them all at the end of the
3413 struct elf_link_hash_entry *h;
3415 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3417 /* FIXME: What about bfd_link_hash_common? */
3419 && (h->root.type == bfd_link_hash_defined
3420 || h->root.type == bfd_link_hash_defweak))
3425 msg = (char *) bfd_alloc (abfd, sz + 1);
3429 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3434 if (! (_bfd_generic_link_add_one_symbol
3435 (info, abfd, name, BSF_WARNING, s, 0, msg,
3436 FALSE, bed->collect, NULL)))
3439 if (!info->relocatable && info->executable)
3441 /* Clobber the section size so that the warning does
3442 not get copied into the output file. */
3445 /* Also set SEC_EXCLUDE, so that symbols defined in
3446 the warning section don't get copied to the output. */
3447 s->flags |= SEC_EXCLUDE;
3452 just_syms = ((s = abfd->sections) != NULL
3453 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);
3458 /* If we are creating a shared library, create all the dynamic
3459 sections immediately. We need to attach them to something,
3460 so we attach them to this BFD, provided it is the right
3461 format and is not from ld --just-symbols. FIXME: If there
3462 are no input BFD's of the same format as the output, we can't
3463 make a shared library. */
3466 && is_elf_hash_table (htab)
3467 && info->output_bfd->xvec == abfd->xvec
3468 && !htab->dynamic_sections_created)
3470 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3474 else if (!is_elf_hash_table (htab))
3478 const char *soname = NULL;
3480 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3483 /* ld --just-symbols and dynamic objects don't mix very well.
3484 ld shouldn't allow it. */
3488 /* If this dynamic lib was specified on the command line with
3489 --as-needed in effect, then we don't want to add a DT_NEEDED
3490 tag unless the lib is actually used. Similary for libs brought
3491 in by another lib's DT_NEEDED. When --no-add-needed is used
3492 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3493 any dynamic library in DT_NEEDED tags in the dynamic lib at
3495 add_needed = (elf_dyn_lib_class (abfd)
3496 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3497 | DYN_NO_NEEDED)) == 0;
3499 s = bfd_get_section_by_name (abfd, ".dynamic");
3504 unsigned int elfsec;
3505 unsigned long shlink;
3507 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3514 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3515 if (elfsec == SHN_BAD)
3516 goto error_free_dyn;
3517 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3519 for (extdyn = dynbuf;
3520 extdyn < dynbuf + s->size;
3521 extdyn += bed->s->sizeof_dyn)
3523 Elf_Internal_Dyn dyn;
3525 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3526 if (dyn.d_tag == DT_SONAME)
3528 unsigned int tagv = dyn.d_un.d_val;
3529 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3531 goto error_free_dyn;
3533 if (dyn.d_tag == DT_NEEDED)
3535 struct bfd_link_needed_list *n, **pn;
3537 unsigned int tagv = dyn.d_un.d_val;
3539 amt = sizeof (struct bfd_link_needed_list);
3540 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3541 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3542 if (n == NULL || fnm == NULL)
3543 goto error_free_dyn;
3544 amt = strlen (fnm) + 1;
3545 anm = (char *) bfd_alloc (abfd, amt);
3547 goto error_free_dyn;
3548 memcpy (anm, fnm, amt);
3552 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3556 if (dyn.d_tag == DT_RUNPATH)
3558 struct bfd_link_needed_list *n, **pn;
3560 unsigned int tagv = dyn.d_un.d_val;
3562 amt = sizeof (struct bfd_link_needed_list);
3563 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3564 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3565 if (n == NULL || fnm == NULL)
3566 goto error_free_dyn;
3567 amt = strlen (fnm) + 1;
3568 anm = (char *) bfd_alloc (abfd, amt);
3570 goto error_free_dyn;
3571 memcpy (anm, fnm, amt);
3575 for (pn = & runpath;
3581 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3582 if (!runpath && dyn.d_tag == DT_RPATH)
3584 struct bfd_link_needed_list *n, **pn;
3586 unsigned int tagv = dyn.d_un.d_val;
3588 amt = sizeof (struct bfd_link_needed_list);
3589 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3590 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3591 if (n == NULL || fnm == NULL)
3592 goto error_free_dyn;
3593 amt = strlen (fnm) + 1;
3594 anm = (char *) bfd_alloc (abfd, amt);
3596 goto error_free_dyn;
3597 memcpy (anm, fnm, amt);
3607 if (dyn.d_tag == DT_AUDIT)
3609 unsigned int tagv = dyn.d_un.d_val;
3610 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3617 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3618 frees all more recently bfd_alloc'd blocks as well. */
3624 struct bfd_link_needed_list **pn;
3625 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3630 /* We do not want to include any of the sections in a dynamic
3631 object in the output file. We hack by simply clobbering the
3632 list of sections in the BFD. This could be handled more
3633 cleanly by, say, a new section flag; the existing
3634 SEC_NEVER_LOAD flag is not the one we want, because that one
3635 still implies that the section takes up space in the output
3637 bfd_section_list_clear (abfd);
3639 /* Find the name to use in a DT_NEEDED entry that refers to this
3640 object. If the object has a DT_SONAME entry, we use it.
3641 Otherwise, if the generic linker stuck something in
3642 elf_dt_name, we use that. Otherwise, we just use the file
3644 if (soname == NULL || *soname == '\0')
3646 soname = elf_dt_name (abfd);
3647 if (soname == NULL || *soname == '\0')
3648 soname = bfd_get_filename (abfd);
3651 /* Save the SONAME because sometimes the linker emulation code
3652 will need to know it. */
3653 elf_dt_name (abfd) = soname;
3655 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3659 /* If we have already included this dynamic object in the
3660 link, just ignore it. There is no reason to include a
3661 particular dynamic object more than once. */
3665 /* Save the DT_AUDIT entry for the linker emulation code. */
3666 elf_dt_audit (abfd) = audit;
3669 /* If this is a dynamic object, we always link against the .dynsym
3670 symbol table, not the .symtab symbol table. The dynamic linker
3671 will only see the .dynsym symbol table, so there is no reason to
3672 look at .symtab for a dynamic object. */
3674 if (! dynamic || elf_dynsymtab (abfd) == 0)
3675 hdr = &elf_tdata (abfd)->symtab_hdr;
3677 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3679 symcount = hdr->sh_size / bed->s->sizeof_sym;
3681 /* The sh_info field of the symtab header tells us where the
3682 external symbols start. We don't care about the local symbols at
3684 if (elf_bad_symtab (abfd))
3686 extsymcount = symcount;
3691 extsymcount = symcount - hdr->sh_info;
3692 extsymoff = hdr->sh_info;
3695 sym_hash = elf_sym_hashes (abfd);
3696 if (extsymcount != 0)
3698 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3700 if (isymbuf == NULL)
3703 if (sym_hash == NULL)
3705 /* We store a pointer to the hash table entry for each
3707 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3708 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
3709 if (sym_hash == NULL)
3710 goto error_free_sym;
3711 elf_sym_hashes (abfd) = sym_hash;
3717 /* Read in any version definitions. */
3718 if (!_bfd_elf_slurp_version_tables (abfd,
3719 info->default_imported_symver))
3720 goto error_free_sym;
3722 /* Read in the symbol versions, but don't bother to convert them
3723 to internal format. */
3724 if (elf_dynversym (abfd) != 0)
3726 Elf_Internal_Shdr *versymhdr;
3728 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3729 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3730 if (extversym == NULL)
3731 goto error_free_sym;
3732 amt = versymhdr->sh_size;
3733 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3734 || bfd_bread (extversym, amt, abfd) != amt)
3735 goto error_free_vers;
3739 /* If we are loading an as-needed shared lib, save the symbol table
3740 state before we start adding symbols. If the lib turns out
3741 to be unneeded, restore the state. */
3742 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3747 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3749 struct bfd_hash_entry *p;
3750 struct elf_link_hash_entry *h;
3752 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3754 h = (struct elf_link_hash_entry *) p;
3755 entsize += htab->root.table.entsize;
3756 if (h->root.type == bfd_link_hash_warning)
3757 entsize += htab->root.table.entsize;
3761 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3762 old_tab = bfd_malloc (tabsize + entsize);
3763 if (old_tab == NULL)
3764 goto error_free_vers;
3766 /* Remember the current objalloc pointer, so that all mem for
3767 symbols added can later be reclaimed. */
3768 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3769 if (alloc_mark == NULL)
3770 goto error_free_vers;
3772 /* Make a special call to the linker "notice" function to
3773 tell it that we are about to handle an as-needed lib. */
3774 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
3775 goto error_free_vers;
3777 /* Clone the symbol table. Remember some pointers into the
3778 symbol table, and dynamic symbol count. */
3779 old_ent = (char *) old_tab + tabsize;
3780 memcpy (old_tab, htab->root.table.table, tabsize);
3781 old_undefs = htab->root.undefs;
3782 old_undefs_tail = htab->root.undefs_tail;
3783 old_table = htab->root.table.table;
3784 old_size = htab->root.table.size;
3785 old_count = htab->root.table.count;
3786 old_dynsymcount = htab->dynsymcount;
3787 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
3789 for (i = 0; i < htab->root.table.size; i++)
3791 struct bfd_hash_entry *p;
3792 struct elf_link_hash_entry *h;
3794 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3796 memcpy (old_ent, p, htab->root.table.entsize);
3797 old_ent = (char *) old_ent + htab->root.table.entsize;
3798 h = (struct elf_link_hash_entry *) p;
3799 if (h->root.type == bfd_link_hash_warning)
3801 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3802 old_ent = (char *) old_ent + htab->root.table.entsize;
3809 ever = extversym != NULL ? extversym + extsymoff : NULL;
3810 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3812 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3816 asection *sec, *new_sec;
3819 struct elf_link_hash_entry *h;
3820 struct elf_link_hash_entry *hi;
3821 bfd_boolean definition;
3822 bfd_boolean size_change_ok;
3823 bfd_boolean type_change_ok;
3824 bfd_boolean new_weakdef;
3825 bfd_boolean new_weak;
3826 bfd_boolean old_weak;
3827 bfd_boolean override;
3829 unsigned int old_alignment;
3834 flags = BSF_NO_FLAGS;
3836 value = isym->st_value;
3837 common = bed->common_definition (isym);
3839 bind = ELF_ST_BIND (isym->st_info);
3843 /* This should be impossible, since ELF requires that all
3844 global symbols follow all local symbols, and that sh_info
3845 point to the first global symbol. Unfortunately, Irix 5
3850 if (isym->st_shndx != SHN_UNDEF && !common)
3858 case STB_GNU_UNIQUE:
3859 flags = BSF_GNU_UNIQUE;
3863 /* Leave it up to the processor backend. */
3867 if (isym->st_shndx == SHN_UNDEF)
3868 sec = bfd_und_section_ptr;
3869 else if (isym->st_shndx == SHN_ABS)
3870 sec = bfd_abs_section_ptr;
3871 else if (isym->st_shndx == SHN_COMMON)
3873 sec = bfd_com_section_ptr;
3874 /* What ELF calls the size we call the value. What ELF
3875 calls the value we call the alignment. */
3876 value = isym->st_size;
3880 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3882 sec = bfd_abs_section_ptr;
3883 else if (discarded_section (sec))
3885 /* Symbols from discarded section are undefined. We keep
3887 sec = bfd_und_section_ptr;
3888 isym->st_shndx = SHN_UNDEF;
3890 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3894 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3897 goto error_free_vers;
3899 if (isym->st_shndx == SHN_COMMON
3900 && (abfd->flags & BFD_PLUGIN) != 0)
3902 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
3906 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
3908 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
3910 goto error_free_vers;
3914 else if (isym->st_shndx == SHN_COMMON
3915 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3916 && !info->relocatable)
3918 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3922 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
3923 | SEC_LINKER_CREATED);
3924 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
3926 goto error_free_vers;
3930 else if (bed->elf_add_symbol_hook)
3932 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3934 goto error_free_vers;
3936 /* The hook function sets the name to NULL if this symbol
3937 should be skipped for some reason. */
3942 /* Sanity check that all possibilities were handled. */
3945 bfd_set_error (bfd_error_bad_value);
3946 goto error_free_vers;
3949 /* Silently discard TLS symbols from --just-syms. There's
3950 no way to combine a static TLS block with a new TLS block
3951 for this executable. */
3952 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
3953 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3956 if (bfd_is_und_section (sec)
3957 || bfd_is_com_section (sec))
3962 size_change_ok = FALSE;
3963 type_change_ok = bed->type_change_ok;
3969 if (is_elf_hash_table (htab))
3971 Elf_Internal_Versym iver;
3972 unsigned int vernum = 0;
3977 if (info->default_imported_symver)
3978 /* Use the default symbol version created earlier. */
3979 iver.vs_vers = elf_tdata (abfd)->cverdefs;
3984 _bfd_elf_swap_versym_in (abfd, ever, &iver);
3986 vernum = iver.vs_vers & VERSYM_VERSION;
3988 /* If this is a hidden symbol, or if it is not version
3989 1, we append the version name to the symbol name.
3990 However, we do not modify a non-hidden absolute symbol
3991 if it is not a function, because it might be the version
3992 symbol itself. FIXME: What if it isn't? */
3993 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
3995 && (!bfd_is_abs_section (sec)
3996 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
3999 size_t namelen, verlen, newlen;
4002 if (isym->st_shndx != SHN_UNDEF)
4004 if (vernum > elf_tdata (abfd)->cverdefs)
4006 else if (vernum > 1)
4008 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4014 (*_bfd_error_handler)
4015 (_("%B: %s: invalid version %u (max %d)"),
4017 elf_tdata (abfd)->cverdefs);
4018 bfd_set_error (bfd_error_bad_value);
4019 goto error_free_vers;
4024 /* We cannot simply test for the number of
4025 entries in the VERNEED section since the
4026 numbers for the needed versions do not start
4028 Elf_Internal_Verneed *t;
4031 for (t = elf_tdata (abfd)->verref;
4035 Elf_Internal_Vernaux *a;
4037 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4039 if (a->vna_other == vernum)
4041 verstr = a->vna_nodename;
4050 (*_bfd_error_handler)
4051 (_("%B: %s: invalid needed version %d"),
4052 abfd, name, vernum);
4053 bfd_set_error (bfd_error_bad_value);
4054 goto error_free_vers;
4058 namelen = strlen (name);
4059 verlen = strlen (verstr);
4060 newlen = namelen + verlen + 2;
4061 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4062 && isym->st_shndx != SHN_UNDEF)
4065 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4066 if (newname == NULL)
4067 goto error_free_vers;
4068 memcpy (newname, name, namelen);
4069 p = newname + namelen;
4071 /* If this is a defined non-hidden version symbol,
4072 we add another @ to the name. This indicates the
4073 default version of the symbol. */
4074 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4075 && isym->st_shndx != SHN_UNDEF)
4077 memcpy (p, verstr, verlen + 1);
4082 /* If this symbol has default visibility and the user has
4083 requested we not re-export it, then mark it as hidden. */
4087 || (abfd->my_archive && abfd->my_archive->no_export))
4088 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4089 isym->st_other = (STV_HIDDEN
4090 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4092 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4093 sym_hash, &old_bfd, &old_weak,
4094 &old_alignment, &skip, &override,
4095 &type_change_ok, &size_change_ok))
4096 goto error_free_vers;
4105 while (h->root.type == bfd_link_hash_indirect
4106 || h->root.type == bfd_link_hash_warning)
4107 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4109 if (elf_tdata (abfd)->verdef != NULL
4112 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4115 if (! (_bfd_generic_link_add_one_symbol
4116 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4117 (struct bfd_link_hash_entry **) sym_hash)))
4118 goto error_free_vers;
4121 /* We need to make sure that indirect symbol dynamic flags are
4124 while (h->root.type == bfd_link_hash_indirect
4125 || h->root.type == bfd_link_hash_warning)
4126 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4130 new_weak = (flags & BSF_WEAK) != 0;
4131 new_weakdef = FALSE;
4135 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4136 && is_elf_hash_table (htab)
4137 && h->u.weakdef == NULL)
4139 /* Keep a list of all weak defined non function symbols from
4140 a dynamic object, using the weakdef field. Later in this
4141 function we will set the weakdef field to the correct
4142 value. We only put non-function symbols from dynamic
4143 objects on this list, because that happens to be the only
4144 time we need to know the normal symbol corresponding to a
4145 weak symbol, and the information is time consuming to
4146 figure out. If the weakdef field is not already NULL,
4147 then this symbol was already defined by some previous
4148 dynamic object, and we will be using that previous
4149 definition anyhow. */
4151 h->u.weakdef = weaks;
4156 /* Set the alignment of a common symbol. */
4157 if ((common || bfd_is_com_section (sec))
4158 && h->root.type == bfd_link_hash_common)
4163 align = bfd_log2 (isym->st_value);
4166 /* The new symbol is a common symbol in a shared object.
4167 We need to get the alignment from the section. */
4168 align = new_sec->alignment_power;
4170 if (align > old_alignment)
4171 h->root.u.c.p->alignment_power = align;
4173 h->root.u.c.p->alignment_power = old_alignment;
4176 if (is_elf_hash_table (htab))
4178 /* Set a flag in the hash table entry indicating the type of
4179 reference or definition we just found. A dynamic symbol
4180 is one which is referenced or defined by both a regular
4181 object and a shared object. */
4182 bfd_boolean dynsym = FALSE;
4184 /* Plugin symbols aren't normal. Don't set def_regular or
4185 ref_regular for them, or make them dynamic. */
4186 if ((abfd->flags & BFD_PLUGIN) != 0)
4193 if (bind != STB_WEAK)
4194 h->ref_regular_nonweak = 1;
4206 /* If the indirect symbol has been forced local, don't
4207 make the real symbol dynamic. */
4208 if ((h == hi || !hi->forced_local)
4209 && (! info->executable
4219 hi->ref_dynamic = 1;
4224 hi->def_dynamic = 1;
4227 /* If the indirect symbol has been forced local, don't
4228 make the real symbol dynamic. */
4229 if ((h == hi || !hi->forced_local)
4232 || (h->u.weakdef != NULL
4234 && h->u.weakdef->dynindx != -1)))
4238 /* Check to see if we need to add an indirect symbol for
4239 the default name. */
4241 || (!override && h->root.type == bfd_link_hash_common))
4242 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4243 sec, value, &old_bfd, &dynsym))
4244 goto error_free_vers;
4246 /* Check the alignment when a common symbol is involved. This
4247 can change when a common symbol is overridden by a normal
4248 definition or a common symbol is ignored due to the old
4249 normal definition. We need to make sure the maximum
4250 alignment is maintained. */
4251 if ((old_alignment || common)
4252 && h->root.type != bfd_link_hash_common)
4254 unsigned int common_align;
4255 unsigned int normal_align;
4256 unsigned int symbol_align;
4260 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4261 || h->root.type == bfd_link_hash_defweak);
4263 symbol_align = ffs (h->root.u.def.value) - 1;
4264 if (h->root.u.def.section->owner != NULL
4265 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4267 normal_align = h->root.u.def.section->alignment_power;
4268 if (normal_align > symbol_align)
4269 normal_align = symbol_align;
4272 normal_align = symbol_align;
4276 common_align = old_alignment;
4277 common_bfd = old_bfd;
4282 common_align = bfd_log2 (isym->st_value);
4284 normal_bfd = old_bfd;
4287 if (normal_align < common_align)
4289 /* PR binutils/2735 */
4290 if (normal_bfd == NULL)
4291 (*_bfd_error_handler)
4292 (_("Warning: alignment %u of common symbol `%s' in %B is"
4293 " greater than the alignment (%u) of its section %A"),
4294 common_bfd, h->root.u.def.section,
4295 1 << common_align, name, 1 << normal_align);
4297 (*_bfd_error_handler)
4298 (_("Warning: alignment %u of symbol `%s' in %B"
4299 " is smaller than %u in %B"),
4300 normal_bfd, common_bfd,
4301 1 << normal_align, name, 1 << common_align);
4305 /* Remember the symbol size if it isn't undefined. */
4306 if (isym->st_size != 0
4307 && isym->st_shndx != SHN_UNDEF
4308 && (definition || h->size == 0))
4311 && h->size != isym->st_size
4312 && ! size_change_ok)
4313 (*_bfd_error_handler)
4314 (_("Warning: size of symbol `%s' changed"
4315 " from %lu in %B to %lu in %B"),
4317 name, (unsigned long) h->size,
4318 (unsigned long) isym->st_size);
4320 h->size = isym->st_size;
4323 /* If this is a common symbol, then we always want H->SIZE
4324 to be the size of the common symbol. The code just above
4325 won't fix the size if a common symbol becomes larger. We
4326 don't warn about a size change here, because that is
4327 covered by --warn-common. Allow changes between different
4329 if (h->root.type == bfd_link_hash_common)
4330 h->size = h->root.u.c.size;
4332 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4333 && ((definition && !new_weak)
4334 || (old_weak && h->root.type == bfd_link_hash_common)
4335 || h->type == STT_NOTYPE))
4337 unsigned int type = ELF_ST_TYPE (isym->st_info);
4339 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4341 if (type == STT_GNU_IFUNC
4342 && (abfd->flags & DYNAMIC) != 0)
4345 if (h->type != type)
4347 if (h->type != STT_NOTYPE && ! type_change_ok)
4348 (*_bfd_error_handler)
4349 (_("Warning: type of symbol `%s' changed"
4350 " from %d to %d in %B"),
4351 abfd, name, h->type, type);
4357 /* Merge st_other field. */
4358 elf_merge_st_other (abfd, h, isym, sec, definition, dynamic);
4360 /* We don't want to make debug symbol dynamic. */
4361 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4364 /* Nor should we make plugin symbols dynamic. */
4365 if ((abfd->flags & BFD_PLUGIN) != 0)
4370 h->target_internal = isym->st_target_internal;
4371 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4374 if (definition && !dynamic)
4376 char *p = strchr (name, ELF_VER_CHR);
4377 if (p != NULL && p[1] != ELF_VER_CHR)
4379 /* Queue non-default versions so that .symver x, x@FOO
4380 aliases can be checked. */
4383 amt = ((isymend - isym + 1)
4384 * sizeof (struct elf_link_hash_entry *));
4386 (struct elf_link_hash_entry **) bfd_malloc (amt);
4388 goto error_free_vers;
4390 nondeflt_vers[nondeflt_vers_cnt++] = h;
4394 if (dynsym && h->dynindx == -1)
4396 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4397 goto error_free_vers;
4398 if (h->u.weakdef != NULL
4400 && h->u.weakdef->dynindx == -1)
4402 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4403 goto error_free_vers;
4406 else if (dynsym && h->dynindx != -1)
4407 /* If the symbol already has a dynamic index, but
4408 visibility says it should not be visible, turn it into
4410 switch (ELF_ST_VISIBILITY (h->other))
4414 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4419 /* Don't add DT_NEEDED for references from the dummy bfd. */
4423 && h->ref_regular_nonweak
4425 || (old_bfd->flags & BFD_PLUGIN) == 0))
4426 || (h->ref_dynamic_nonweak
4427 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4428 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4431 const char *soname = elf_dt_name (abfd);
4433 info->callbacks->minfo ("%!", soname, old_bfd,
4434 h->root.root.string);
4436 /* A symbol from a library loaded via DT_NEEDED of some
4437 other library is referenced by a regular object.
4438 Add a DT_NEEDED entry for it. Issue an error if
4439 --no-add-needed is used and the reference was not
4442 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4444 (*_bfd_error_handler)
4445 (_("%B: undefined reference to symbol '%s'"),
4447 bfd_set_error (bfd_error_missing_dso);
4448 goto error_free_vers;
4451 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4452 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4455 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4457 goto error_free_vers;
4459 BFD_ASSERT (ret == 0);
4464 if (extversym != NULL)
4470 if (isymbuf != NULL)
4476 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4480 /* Restore the symbol table. */
4481 old_ent = (char *) old_tab + tabsize;
4482 memset (elf_sym_hashes (abfd), 0,
4483 extsymcount * sizeof (struct elf_link_hash_entry *));
4484 htab->root.table.table = old_table;
4485 htab->root.table.size = old_size;
4486 htab->root.table.count = old_count;
4487 memcpy (htab->root.table.table, old_tab, tabsize);
4488 htab->root.undefs = old_undefs;
4489 htab->root.undefs_tail = old_undefs_tail;
4490 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4491 for (i = 0; i < htab->root.table.size; i++)
4493 struct bfd_hash_entry *p;
4494 struct elf_link_hash_entry *h;
4496 unsigned int alignment_power;
4498 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4500 h = (struct elf_link_hash_entry *) p;
4501 if (h->root.type == bfd_link_hash_warning)
4502 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4503 if (h->dynindx >= old_dynsymcount
4504 && h->dynstr_index < old_dynstr_size)
4505 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4507 /* Preserve the maximum alignment and size for common
4508 symbols even if this dynamic lib isn't on DT_NEEDED
4509 since it can still be loaded at run time by another
4511 if (h->root.type == bfd_link_hash_common)
4513 size = h->root.u.c.size;
4514 alignment_power = h->root.u.c.p->alignment_power;
4519 alignment_power = 0;
4521 memcpy (p, old_ent, htab->root.table.entsize);
4522 old_ent = (char *) old_ent + htab->root.table.entsize;
4523 h = (struct elf_link_hash_entry *) p;
4524 if (h->root.type == bfd_link_hash_warning)
4526 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4527 old_ent = (char *) old_ent + htab->root.table.entsize;
4528 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4530 if (h->root.type == bfd_link_hash_common)
4532 if (size > h->root.u.c.size)
4533 h->root.u.c.size = size;
4534 if (alignment_power > h->root.u.c.p->alignment_power)
4535 h->root.u.c.p->alignment_power = alignment_power;
4540 /* Make a special call to the linker "notice" function to
4541 tell it that symbols added for crefs may need to be removed. */
4542 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4543 goto error_free_vers;
4546 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4548 if (nondeflt_vers != NULL)
4549 free (nondeflt_vers);
4553 if (old_tab != NULL)
4555 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4556 goto error_free_vers;
4561 /* Now that all the symbols from this input file are created, handle
4562 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4563 if (nondeflt_vers != NULL)
4565 bfd_size_type cnt, symidx;
4567 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4569 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4570 char *shortname, *p;
4572 p = strchr (h->root.root.string, ELF_VER_CHR);
4574 || (h->root.type != bfd_link_hash_defined
4575 && h->root.type != bfd_link_hash_defweak))
4578 amt = p - h->root.root.string;
4579 shortname = (char *) bfd_malloc (amt + 1);
4581 goto error_free_vers;
4582 memcpy (shortname, h->root.root.string, amt);
4583 shortname[amt] = '\0';
4585 hi = (struct elf_link_hash_entry *)
4586 bfd_link_hash_lookup (&htab->root, shortname,
4587 FALSE, FALSE, FALSE);
4589 && hi->root.type == h->root.type
4590 && hi->root.u.def.value == h->root.u.def.value
4591 && hi->root.u.def.section == h->root.u.def.section)
4593 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4594 hi->root.type = bfd_link_hash_indirect;
4595 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4596 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4597 sym_hash = elf_sym_hashes (abfd);
4599 for (symidx = 0; symidx < extsymcount; ++symidx)
4600 if (sym_hash[symidx] == hi)
4602 sym_hash[symidx] = h;
4608 free (nondeflt_vers);
4609 nondeflt_vers = NULL;
4612 /* Now set the weakdefs field correctly for all the weak defined
4613 symbols we found. The only way to do this is to search all the
4614 symbols. Since we only need the information for non functions in
4615 dynamic objects, that's the only time we actually put anything on
4616 the list WEAKS. We need this information so that if a regular
4617 object refers to a symbol defined weakly in a dynamic object, the
4618 real symbol in the dynamic object is also put in the dynamic
4619 symbols; we also must arrange for both symbols to point to the
4620 same memory location. We could handle the general case of symbol
4621 aliasing, but a general symbol alias can only be generated in
4622 assembler code, handling it correctly would be very time
4623 consuming, and other ELF linkers don't handle general aliasing
4627 struct elf_link_hash_entry **hpp;
4628 struct elf_link_hash_entry **hppend;
4629 struct elf_link_hash_entry **sorted_sym_hash;
4630 struct elf_link_hash_entry *h;
4633 /* Since we have to search the whole symbol list for each weak
4634 defined symbol, search time for N weak defined symbols will be
4635 O(N^2). Binary search will cut it down to O(NlogN). */
4636 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4637 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4638 if (sorted_sym_hash == NULL)
4640 sym_hash = sorted_sym_hash;
4641 hpp = elf_sym_hashes (abfd);
4642 hppend = hpp + extsymcount;
4644 for (; hpp < hppend; hpp++)
4648 && h->root.type == bfd_link_hash_defined
4649 && !bed->is_function_type (h->type))
4657 qsort (sorted_sym_hash, sym_count,
4658 sizeof (struct elf_link_hash_entry *),
4661 while (weaks != NULL)
4663 struct elf_link_hash_entry *hlook;
4666 size_t i, j, idx = 0;
4669 weaks = hlook->u.weakdef;
4670 hlook->u.weakdef = NULL;
4672 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4673 || hlook->root.type == bfd_link_hash_defweak
4674 || hlook->root.type == bfd_link_hash_common
4675 || hlook->root.type == bfd_link_hash_indirect);
4676 slook = hlook->root.u.def.section;
4677 vlook = hlook->root.u.def.value;
4683 bfd_signed_vma vdiff;
4685 h = sorted_sym_hash[idx];
4686 vdiff = vlook - h->root.u.def.value;
4693 long sdiff = slook->id - h->root.u.def.section->id;
4703 /* We didn't find a value/section match. */
4707 /* With multiple aliases, or when the weak symbol is already
4708 strongly defined, we have multiple matching symbols and
4709 the binary search above may land on any of them. Step
4710 one past the matching symbol(s). */
4713 h = sorted_sym_hash[idx];
4714 if (h->root.u.def.section != slook
4715 || h->root.u.def.value != vlook)
4719 /* Now look back over the aliases. Since we sorted by size
4720 as well as value and section, we'll choose the one with
4721 the largest size. */
4724 h = sorted_sym_hash[idx];
4726 /* Stop if value or section doesn't match. */
4727 if (h->root.u.def.section != slook
4728 || h->root.u.def.value != vlook)
4730 else if (h != hlook)
4732 hlook->u.weakdef = h;
4734 /* If the weak definition is in the list of dynamic
4735 symbols, make sure the real definition is put
4737 if (hlook->dynindx != -1 && h->dynindx == -1)
4739 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4742 free (sorted_sym_hash);
4747 /* If the real definition is in the list of dynamic
4748 symbols, make sure the weak definition is put
4749 there as well. If we don't do this, then the
4750 dynamic loader might not merge the entries for the
4751 real definition and the weak definition. */
4752 if (h->dynindx != -1 && hlook->dynindx == -1)
4754 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4755 goto err_free_sym_hash;
4762 free (sorted_sym_hash);
4765 if (bed->check_directives
4766 && !(*bed->check_directives) (abfd, info))
4769 /* If this object is the same format as the output object, and it is
4770 not a shared library, then let the backend look through the
4773 This is required to build global offset table entries and to
4774 arrange for dynamic relocs. It is not required for the
4775 particular common case of linking non PIC code, even when linking
4776 against shared libraries, but unfortunately there is no way of
4777 knowing whether an object file has been compiled PIC or not.
4778 Looking through the relocs is not particularly time consuming.
4779 The problem is that we must either (1) keep the relocs in memory,
4780 which causes the linker to require additional runtime memory or
4781 (2) read the relocs twice from the input file, which wastes time.
4782 This would be a good case for using mmap.
4784 I have no idea how to handle linking PIC code into a file of a
4785 different format. It probably can't be done. */
4787 && is_elf_hash_table (htab)
4788 && bed->check_relocs != NULL
4789 && elf_object_id (abfd) == elf_hash_table_id (htab)
4790 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4794 for (o = abfd->sections; o != NULL; o = o->next)
4796 Elf_Internal_Rela *internal_relocs;
4799 if ((o->flags & SEC_RELOC) == 0
4800 || o->reloc_count == 0
4801 || ((info->strip == strip_all || info->strip == strip_debugger)
4802 && (o->flags & SEC_DEBUGGING) != 0)
4803 || bfd_is_abs_section (o->output_section))
4806 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4808 if (internal_relocs == NULL)
4811 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4813 if (elf_section_data (o)->relocs != internal_relocs)
4814 free (internal_relocs);
4821 /* If this is a non-traditional link, try to optimize the handling
4822 of the .stab/.stabstr sections. */
4824 && ! info->traditional_format
4825 && is_elf_hash_table (htab)
4826 && (info->strip != strip_all && info->strip != strip_debugger))
4830 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4831 if (stabstr != NULL)
4833 bfd_size_type string_offset = 0;
4836 for (stab = abfd->sections; stab; stab = stab->next)
4837 if (CONST_STRNEQ (stab->name, ".stab")
4838 && (!stab->name[5] ||
4839 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4840 && (stab->flags & SEC_MERGE) == 0
4841 && !bfd_is_abs_section (stab->output_section))
4843 struct bfd_elf_section_data *secdata;
4845 secdata = elf_section_data (stab);
4846 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4847 stabstr, &secdata->sec_info,
4850 if (secdata->sec_info)
4851 stab->sec_info_type = SEC_INFO_TYPE_STABS;
4856 if (is_elf_hash_table (htab) && add_needed)
4858 /* Add this bfd to the loaded list. */
4859 struct elf_link_loaded_list *n;
4861 n = (struct elf_link_loaded_list *)
4862 bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4866 n->next = htab->loaded;
4873 if (old_tab != NULL)
4875 if (nondeflt_vers != NULL)
4876 free (nondeflt_vers);
4877 if (extversym != NULL)
4880 if (isymbuf != NULL)
4886 /* Return the linker hash table entry of a symbol that might be
4887 satisfied by an archive symbol. Return -1 on error. */
4889 struct elf_link_hash_entry *
4890 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4891 struct bfd_link_info *info,
4894 struct elf_link_hash_entry *h;
4898 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
4902 /* If this is a default version (the name contains @@), look up the
4903 symbol again with only one `@' as well as without the version.
4904 The effect is that references to the symbol with and without the
4905 version will be matched by the default symbol in the archive. */
4907 p = strchr (name, ELF_VER_CHR);
4908 if (p == NULL || p[1] != ELF_VER_CHR)
4911 /* First check with only one `@'. */
4912 len = strlen (name);
4913 copy = (char *) bfd_alloc (abfd, len);
4915 return (struct elf_link_hash_entry *) 0 - 1;
4917 first = p - name + 1;
4918 memcpy (copy, name, first);
4919 memcpy (copy + first, name + first + 1, len - first);
4921 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
4924 /* We also need to check references to the symbol without the
4926 copy[first - 1] = '\0';
4927 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4928 FALSE, FALSE, TRUE);
4931 bfd_release (abfd, copy);
4935 /* Add symbols from an ELF archive file to the linker hash table. We
4936 don't use _bfd_generic_link_add_archive_symbols because we need to
4937 handle versioned symbols.
4939 Fortunately, ELF archive handling is simpler than that done by
4940 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4941 oddities. In ELF, if we find a symbol in the archive map, and the
4942 symbol is currently undefined, we know that we must pull in that
4945 Unfortunately, we do have to make multiple passes over the symbol
4946 table until nothing further is resolved. */
4949 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4952 unsigned char *included = NULL;
4956 const struct elf_backend_data *bed;
4957 struct elf_link_hash_entry * (*archive_symbol_lookup)
4958 (bfd *, struct bfd_link_info *, const char *);
4960 if (! bfd_has_map (abfd))
4962 /* An empty archive is a special case. */
4963 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4965 bfd_set_error (bfd_error_no_armap);
4969 /* Keep track of all symbols we know to be already defined, and all
4970 files we know to be already included. This is to speed up the
4971 second and subsequent passes. */
4972 c = bfd_ardata (abfd)->symdef_count;
4976 amt *= sizeof (*included);
4977 included = (unsigned char *) bfd_zmalloc (amt);
4978 if (included == NULL)
4981 symdefs = bfd_ardata (abfd)->symdefs;
4982 bed = get_elf_backend_data (abfd);
4983 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
4996 symdefend = symdef + c;
4997 for (i = 0; symdef < symdefend; symdef++, i++)
4999 struct elf_link_hash_entry *h;
5001 struct bfd_link_hash_entry *undefs_tail;
5006 if (symdef->file_offset == last)
5012 h = archive_symbol_lookup (abfd, info, symdef->name);
5013 if (h == (struct elf_link_hash_entry *) 0 - 1)
5019 if (h->root.type == bfd_link_hash_common)
5021 /* We currently have a common symbol. The archive map contains
5022 a reference to this symbol, so we may want to include it. We
5023 only want to include it however, if this archive element
5024 contains a definition of the symbol, not just another common
5027 Unfortunately some archivers (including GNU ar) will put
5028 declarations of common symbols into their archive maps, as
5029 well as real definitions, so we cannot just go by the archive
5030 map alone. Instead we must read in the element's symbol
5031 table and check that to see what kind of symbol definition
5033 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5036 else if (h->root.type != bfd_link_hash_undefined)
5038 if (h->root.type != bfd_link_hash_undefweak)
5039 /* Symbol must be defined. Don't check it again. */
5044 /* We need to include this archive member. */
5045 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5046 if (element == NULL)
5049 if (! bfd_check_format (element, bfd_object))
5052 undefs_tail = info->hash->undefs_tail;
5054 if (!(*info->callbacks
5055 ->add_archive_element) (info, element, symdef->name, &element))
5057 if (!bfd_link_add_symbols (element, info))
5060 /* If there are any new undefined symbols, we need to make
5061 another pass through the archive in order to see whether
5062 they can be defined. FIXME: This isn't perfect, because
5063 common symbols wind up on undefs_tail and because an
5064 undefined symbol which is defined later on in this pass
5065 does not require another pass. This isn't a bug, but it
5066 does make the code less efficient than it could be. */
5067 if (undefs_tail != info->hash->undefs_tail)
5070 /* Look backward to mark all symbols from this object file
5071 which we have already seen in this pass. */
5075 included[mark] = TRUE;
5080 while (symdefs[mark].file_offset == symdef->file_offset);
5082 /* We mark subsequent symbols from this object file as we go
5083 on through the loop. */
5084 last = symdef->file_offset;
5094 if (included != NULL)
5099 /* Given an ELF BFD, add symbols to the global hash table as
5103 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5105 switch (bfd_get_format (abfd))
5108 return elf_link_add_object_symbols (abfd, info);
5110 return elf_link_add_archive_symbols (abfd, info);
5112 bfd_set_error (bfd_error_wrong_format);
5117 struct hash_codes_info
5119 unsigned long *hashcodes;
5123 /* This function will be called though elf_link_hash_traverse to store
5124 all hash value of the exported symbols in an array. */
5127 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5129 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5135 /* Ignore indirect symbols. These are added by the versioning code. */
5136 if (h->dynindx == -1)
5139 name = h->root.root.string;
5140 p = strchr (name, ELF_VER_CHR);
5143 alc = (char *) bfd_malloc (p - name + 1);
5149 memcpy (alc, name, p - name);
5150 alc[p - name] = '\0';
5154 /* Compute the hash value. */
5155 ha = bfd_elf_hash (name);
5157 /* Store the found hash value in the array given as the argument. */
5158 *(inf->hashcodes)++ = ha;
5160 /* And store it in the struct so that we can put it in the hash table
5162 h->u.elf_hash_value = ha;
5170 struct collect_gnu_hash_codes
5173 const struct elf_backend_data *bed;
5174 unsigned long int nsyms;
5175 unsigned long int maskbits;
5176 unsigned long int *hashcodes;
5177 unsigned long int *hashval;
5178 unsigned long int *indx;
5179 unsigned long int *counts;
5182 long int min_dynindx;
5183 unsigned long int bucketcount;
5184 unsigned long int symindx;
5185 long int local_indx;
5186 long int shift1, shift2;
5187 unsigned long int mask;
5191 /* This function will be called though elf_link_hash_traverse to store
5192 all hash value of the exported symbols in an array. */
5195 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5197 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5203 /* Ignore indirect symbols. These are added by the versioning code. */
5204 if (h->dynindx == -1)
5207 /* Ignore also local symbols and undefined symbols. */
5208 if (! (*s->bed->elf_hash_symbol) (h))
5211 name = h->root.root.string;
5212 p = strchr (name, ELF_VER_CHR);
5215 alc = (char *) bfd_malloc (p - name + 1);
5221 memcpy (alc, name, p - name);
5222 alc[p - name] = '\0';
5226 /* Compute the hash value. */
5227 ha = bfd_elf_gnu_hash (name);
5229 /* Store the found hash value in the array for compute_bucket_count,
5230 and also for .dynsym reordering purposes. */
5231 s->hashcodes[s->nsyms] = ha;
5232 s->hashval[h->dynindx] = ha;
5234 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5235 s->min_dynindx = h->dynindx;
5243 /* This function will be called though elf_link_hash_traverse to do
5244 final dynaminc symbol renumbering. */
5247 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5249 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5250 unsigned long int bucket;
5251 unsigned long int val;
5253 /* Ignore indirect symbols. */
5254 if (h->dynindx == -1)
5257 /* Ignore also local symbols and undefined symbols. */
5258 if (! (*s->bed->elf_hash_symbol) (h))
5260 if (h->dynindx >= s->min_dynindx)
5261 h->dynindx = s->local_indx++;
5265 bucket = s->hashval[h->dynindx] % s->bucketcount;
5266 val = (s->hashval[h->dynindx] >> s->shift1)
5267 & ((s->maskbits >> s->shift1) - 1);
5268 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5270 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5271 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5272 if (s->counts[bucket] == 1)
5273 /* Last element terminates the chain. */
5275 bfd_put_32 (s->output_bfd, val,
5276 s->contents + (s->indx[bucket] - s->symindx) * 4);
5277 --s->counts[bucket];
5278 h->dynindx = s->indx[bucket]++;
5282 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5285 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5287 return !(h->forced_local
5288 || h->root.type == bfd_link_hash_undefined
5289 || h->root.type == bfd_link_hash_undefweak
5290 || ((h->root.type == bfd_link_hash_defined
5291 || h->root.type == bfd_link_hash_defweak)
5292 && h->root.u.def.section->output_section == NULL));
5295 /* Array used to determine the number of hash table buckets to use
5296 based on the number of symbols there are. If there are fewer than
5297 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5298 fewer than 37 we use 17 buckets, and so forth. We never use more
5299 than 32771 buckets. */
5301 static const size_t elf_buckets[] =
5303 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5307 /* Compute bucket count for hashing table. We do not use a static set
5308 of possible tables sizes anymore. Instead we determine for all
5309 possible reasonable sizes of the table the outcome (i.e., the
5310 number of collisions etc) and choose the best solution. The
5311 weighting functions are not too simple to allow the table to grow
5312 without bounds. Instead one of the weighting factors is the size.
5313 Therefore the result is always a good payoff between few collisions
5314 (= short chain lengths) and table size. */
5316 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5317 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5318 unsigned long int nsyms,
5321 size_t best_size = 0;
5322 unsigned long int i;
5324 /* We have a problem here. The following code to optimize the table
5325 size requires an integer type with more the 32 bits. If
5326 BFD_HOST_U_64_BIT is set we know about such a type. */
5327 #ifdef BFD_HOST_U_64_BIT
5332 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5333 bfd *dynobj = elf_hash_table (info)->dynobj;
5334 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5335 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5336 unsigned long int *counts;
5338 unsigned int no_improvement_count = 0;
5340 /* Possible optimization parameters: if we have NSYMS symbols we say
5341 that the hashing table must at least have NSYMS/4 and at most
5343 minsize = nsyms / 4;
5346 best_size = maxsize = nsyms * 2;
5351 if ((best_size & 31) == 0)
5355 /* Create array where we count the collisions in. We must use bfd_malloc
5356 since the size could be large. */
5358 amt *= sizeof (unsigned long int);
5359 counts = (unsigned long int *) bfd_malloc (amt);
5363 /* Compute the "optimal" size for the hash table. The criteria is a
5364 minimal chain length. The minor criteria is (of course) the size
5366 for (i = minsize; i < maxsize; ++i)
5368 /* Walk through the array of hashcodes and count the collisions. */
5369 BFD_HOST_U_64_BIT max;
5370 unsigned long int j;
5371 unsigned long int fact;
5373 if (gnu_hash && (i & 31) == 0)
5376 memset (counts, '\0', i * sizeof (unsigned long int));
5378 /* Determine how often each hash bucket is used. */
5379 for (j = 0; j < nsyms; ++j)
5380 ++counts[hashcodes[j] % i];
5382 /* For the weight function we need some information about the
5383 pagesize on the target. This is information need not be 100%
5384 accurate. Since this information is not available (so far) we
5385 define it here to a reasonable default value. If it is crucial
5386 to have a better value some day simply define this value. */
5387 # ifndef BFD_TARGET_PAGESIZE
5388 # define BFD_TARGET_PAGESIZE (4096)
5391 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5393 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5396 /* Variant 1: optimize for short chains. We add the squares
5397 of all the chain lengths (which favors many small chain
5398 over a few long chains). */
5399 for (j = 0; j < i; ++j)
5400 max += counts[j] * counts[j];
5402 /* This adds penalties for the overall size of the table. */
5403 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5406 /* Variant 2: Optimize a lot more for small table. Here we
5407 also add squares of the size but we also add penalties for
5408 empty slots (the +1 term). */
5409 for (j = 0; j < i; ++j)
5410 max += (1 + counts[j]) * (1 + counts[j]);
5412 /* The overall size of the table is considered, but not as
5413 strong as in variant 1, where it is squared. */
5414 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5418 /* Compare with current best results. */
5419 if (max < best_chlen)
5423 no_improvement_count = 0;
5425 /* PR 11843: Avoid futile long searches for the best bucket size
5426 when there are a large number of symbols. */
5427 else if (++no_improvement_count == 100)
5434 #endif /* defined (BFD_HOST_U_64_BIT) */
5436 /* This is the fallback solution if no 64bit type is available or if we
5437 are not supposed to spend much time on optimizations. We select the
5438 bucket count using a fixed set of numbers. */
5439 for (i = 0; elf_buckets[i] != 0; i++)
5441 best_size = elf_buckets[i];
5442 if (nsyms < elf_buckets[i + 1])
5445 if (gnu_hash && best_size < 2)
5452 /* Size any SHT_GROUP section for ld -r. */
5455 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5459 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5460 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5461 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5466 /* Set a default stack segment size. The value in INFO wins. If it
5467 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5468 undefined it is initialized. */
5471 bfd_elf_stack_segment_size (bfd *output_bfd,
5472 struct bfd_link_info *info,
5473 const char *legacy_symbol,
5474 bfd_vma default_size)
5476 struct elf_link_hash_entry *h = NULL;
5478 /* Look for legacy symbol. */
5480 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5481 FALSE, FALSE, FALSE);
5482 if (h && (h->root.type == bfd_link_hash_defined
5483 || h->root.type == bfd_link_hash_defweak)
5485 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5487 /* The symbol has no type if specified on the command line. */
5488 h->type = STT_OBJECT;
5489 if (info->stacksize)
5490 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5491 output_bfd, legacy_symbol);
5492 else if (h->root.u.def.section != bfd_abs_section_ptr)
5493 (*_bfd_error_handler) (_("%B: %s not absolute"),
5494 output_bfd, legacy_symbol);
5496 info->stacksize = h->root.u.def.value;
5499 if (!info->stacksize)
5500 /* If the user didn't set a size, or explicitly inhibit the
5501 size, set it now. */
5502 info->stacksize = default_size;
5504 /* Provide the legacy symbol, if it is referenced. */
5505 if (h && (h->root.type == bfd_link_hash_undefined
5506 || h->root.type == bfd_link_hash_undefweak))
5508 struct bfd_link_hash_entry *bh = NULL;
5510 if (!(_bfd_generic_link_add_one_symbol
5511 (info, output_bfd, legacy_symbol,
5512 BSF_GLOBAL, bfd_abs_section_ptr,
5513 info->stacksize >= 0 ? info->stacksize : 0,
5514 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5517 h = (struct elf_link_hash_entry *) bh;
5519 h->type = STT_OBJECT;
5525 /* Set up the sizes and contents of the ELF dynamic sections. This is
5526 called by the ELF linker emulation before_allocation routine. We
5527 must set the sizes of the sections before the linker sets the
5528 addresses of the various sections. */
5531 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5534 const char *filter_shlib,
5536 const char *depaudit,
5537 const char * const *auxiliary_filters,
5538 struct bfd_link_info *info,
5539 asection **sinterpptr)
5541 bfd_size_type soname_indx;
5543 const struct elf_backend_data *bed;
5544 struct elf_info_failed asvinfo;
5548 soname_indx = (bfd_size_type) -1;
5550 if (!is_elf_hash_table (info->hash))
5553 bed = get_elf_backend_data (output_bfd);
5555 /* Any syms created from now on start with -1 in
5556 got.refcount/offset and plt.refcount/offset. */
5557 elf_hash_table (info)->init_got_refcount
5558 = elf_hash_table (info)->init_got_offset;
5559 elf_hash_table (info)->init_plt_refcount
5560 = elf_hash_table (info)->init_plt_offset;
5562 if (info->relocatable
5563 && !_bfd_elf_size_group_sections (info))
5566 /* The backend may have to create some sections regardless of whether
5567 we're dynamic or not. */
5568 if (bed->elf_backend_always_size_sections
5569 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5572 /* Determine any GNU_STACK segment requirements, after the backend
5573 has had a chance to set a default segment size. */
5574 if (info->execstack)
5575 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5576 else if (info->noexecstack)
5577 elf_stack_flags (output_bfd) = PF_R | PF_W;
5581 asection *notesec = NULL;
5584 for (inputobj = info->input_bfds;
5586 inputobj = inputobj->link.next)
5591 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5593 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5596 if (s->flags & SEC_CODE)
5600 else if (bed->default_execstack)
5603 if (notesec || info->stacksize > 0)
5604 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5605 if (notesec && exec && info->relocatable
5606 && notesec->output_section != bfd_abs_section_ptr)
5607 notesec->output_section->flags |= SEC_CODE;
5610 dynobj = elf_hash_table (info)->dynobj;
5612 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5614 struct elf_info_failed eif;
5615 struct elf_link_hash_entry *h;
5617 struct bfd_elf_version_tree *t;
5618 struct bfd_elf_version_expr *d;
5620 bfd_boolean all_defined;
5622 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5623 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5627 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5629 if (soname_indx == (bfd_size_type) -1
5630 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5636 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5638 info->flags |= DF_SYMBOLIC;
5646 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5648 if (indx == (bfd_size_type) -1)
5651 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5652 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5656 if (filter_shlib != NULL)
5660 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5661 filter_shlib, TRUE);
5662 if (indx == (bfd_size_type) -1
5663 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5667 if (auxiliary_filters != NULL)
5669 const char * const *p;
5671 for (p = auxiliary_filters; *p != NULL; p++)
5675 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5677 if (indx == (bfd_size_type) -1
5678 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5687 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5689 if (indx == (bfd_size_type) -1
5690 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5694 if (depaudit != NULL)
5698 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5700 if (indx == (bfd_size_type) -1
5701 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5708 /* If we are supposed to export all symbols into the dynamic symbol
5709 table (this is not the normal case), then do so. */
5710 if (info->export_dynamic
5711 || (info->executable && info->dynamic))
5713 elf_link_hash_traverse (elf_hash_table (info),
5714 _bfd_elf_export_symbol,
5720 /* Make all global versions with definition. */
5721 for (t = info->version_info; t != NULL; t = t->next)
5722 for (d = t->globals.list; d != NULL; d = d->next)
5723 if (!d->symver && d->literal)
5725 const char *verstr, *name;
5726 size_t namelen, verlen, newlen;
5727 char *newname, *p, leading_char;
5728 struct elf_link_hash_entry *newh;
5730 leading_char = bfd_get_symbol_leading_char (output_bfd);
5732 namelen = strlen (name) + (leading_char != '\0');
5734 verlen = strlen (verstr);
5735 newlen = namelen + verlen + 3;
5737 newname = (char *) bfd_malloc (newlen);
5738 if (newname == NULL)
5740 newname[0] = leading_char;
5741 memcpy (newname + (leading_char != '\0'), name, namelen);
5743 /* Check the hidden versioned definition. */
5744 p = newname + namelen;
5746 memcpy (p, verstr, verlen + 1);
5747 newh = elf_link_hash_lookup (elf_hash_table (info),
5748 newname, FALSE, FALSE,
5751 || (newh->root.type != bfd_link_hash_defined
5752 && newh->root.type != bfd_link_hash_defweak))
5754 /* Check the default versioned definition. */
5756 memcpy (p, verstr, verlen + 1);
5757 newh = elf_link_hash_lookup (elf_hash_table (info),
5758 newname, FALSE, FALSE,
5763 /* Mark this version if there is a definition and it is
5764 not defined in a shared object. */
5766 && !newh->def_dynamic
5767 && (newh->root.type == bfd_link_hash_defined
5768 || newh->root.type == bfd_link_hash_defweak))
5772 /* Attach all the symbols to their version information. */
5773 asvinfo.info = info;
5774 asvinfo.failed = FALSE;
5776 elf_link_hash_traverse (elf_hash_table (info),
5777 _bfd_elf_link_assign_sym_version,
5782 if (!info->allow_undefined_version)
5784 /* Check if all global versions have a definition. */
5786 for (t = info->version_info; t != NULL; t = t->next)
5787 for (d = t->globals.list; d != NULL; d = d->next)
5788 if (d->literal && !d->symver && !d->script)
5790 (*_bfd_error_handler)
5791 (_("%s: undefined version: %s"),
5792 d->pattern, t->name);
5793 all_defined = FALSE;
5798 bfd_set_error (bfd_error_bad_value);
5803 /* Find all symbols which were defined in a dynamic object and make
5804 the backend pick a reasonable value for them. */
5805 elf_link_hash_traverse (elf_hash_table (info),
5806 _bfd_elf_adjust_dynamic_symbol,
5811 /* Add some entries to the .dynamic section. We fill in some of the
5812 values later, in bfd_elf_final_link, but we must add the entries
5813 now so that we know the final size of the .dynamic section. */
5815 /* If there are initialization and/or finalization functions to
5816 call then add the corresponding DT_INIT/DT_FINI entries. */
5817 h = (info->init_function
5818 ? elf_link_hash_lookup (elf_hash_table (info),
5819 info->init_function, FALSE,
5826 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5829 h = (info->fini_function
5830 ? elf_link_hash_lookup (elf_hash_table (info),
5831 info->fini_function, FALSE,
5838 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5842 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5843 if (s != NULL && s->linker_has_input)
5845 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5846 if (! info->executable)
5851 for (sub = info->input_bfds; sub != NULL;
5852 sub = sub->link.next)
5853 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5854 for (o = sub->sections; o != NULL; o = o->next)
5855 if (elf_section_data (o)->this_hdr.sh_type
5856 == SHT_PREINIT_ARRAY)
5858 (*_bfd_error_handler)
5859 (_("%B: .preinit_array section is not allowed in DSO"),
5864 bfd_set_error (bfd_error_nonrepresentable_section);
5868 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5869 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5872 s = bfd_get_section_by_name (output_bfd, ".init_array");
5873 if (s != NULL && s->linker_has_input)
5875 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5876 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5879 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5880 if (s != NULL && s->linker_has_input)
5882 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5883 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5887 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
5888 /* If .dynstr is excluded from the link, we don't want any of
5889 these tags. Strictly, we should be checking each section
5890 individually; This quick check covers for the case where
5891 someone does a /DISCARD/ : { *(*) }. */
5892 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5894 bfd_size_type strsize;
5896 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5897 if ((info->emit_hash
5898 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5899 || (info->emit_gnu_hash
5900 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5901 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5902 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5903 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5904 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5905 bed->s->sizeof_sym))
5910 /* The backend must work out the sizes of all the other dynamic
5913 && bed->elf_backend_size_dynamic_sections != NULL
5914 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5917 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5920 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5922 unsigned long section_sym_count;
5923 struct bfd_elf_version_tree *verdefs;
5926 /* Set up the version definition section. */
5927 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
5928 BFD_ASSERT (s != NULL);
5930 /* We may have created additional version definitions if we are
5931 just linking a regular application. */
5932 verdefs = info->version_info;
5934 /* Skip anonymous version tag. */
5935 if (verdefs != NULL && verdefs->vernum == 0)
5936 verdefs = verdefs->next;
5938 if (verdefs == NULL && !info->create_default_symver)
5939 s->flags |= SEC_EXCLUDE;
5944 struct bfd_elf_version_tree *t;
5946 Elf_Internal_Verdef def;
5947 Elf_Internal_Verdaux defaux;
5948 struct bfd_link_hash_entry *bh;
5949 struct elf_link_hash_entry *h;
5955 /* Make space for the base version. */
5956 size += sizeof (Elf_External_Verdef);
5957 size += sizeof (Elf_External_Verdaux);
5960 /* Make space for the default version. */
5961 if (info->create_default_symver)
5963 size += sizeof (Elf_External_Verdef);
5967 for (t = verdefs; t != NULL; t = t->next)
5969 struct bfd_elf_version_deps *n;
5971 /* Don't emit base version twice. */
5975 size += sizeof (Elf_External_Verdef);
5976 size += sizeof (Elf_External_Verdaux);
5979 for (n = t->deps; n != NULL; n = n->next)
5980 size += sizeof (Elf_External_Verdaux);
5984 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
5985 if (s->contents == NULL && s->size != 0)
5988 /* Fill in the version definition section. */
5992 def.vd_version = VER_DEF_CURRENT;
5993 def.vd_flags = VER_FLG_BASE;
5996 if (info->create_default_symver)
5998 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
5999 def.vd_next = sizeof (Elf_External_Verdef);
6003 def.vd_aux = sizeof (Elf_External_Verdef);
6004 def.vd_next = (sizeof (Elf_External_Verdef)
6005 + sizeof (Elf_External_Verdaux));
6008 if (soname_indx != (bfd_size_type) -1)
6010 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6012 def.vd_hash = bfd_elf_hash (soname);
6013 defaux.vda_name = soname_indx;
6020 name = lbasename (output_bfd->filename);
6021 def.vd_hash = bfd_elf_hash (name);
6022 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6024 if (indx == (bfd_size_type) -1)
6026 defaux.vda_name = indx;
6028 defaux.vda_next = 0;
6030 _bfd_elf_swap_verdef_out (output_bfd, &def,
6031 (Elf_External_Verdef *) p);
6032 p += sizeof (Elf_External_Verdef);
6033 if (info->create_default_symver)
6035 /* Add a symbol representing this version. */
6037 if (! (_bfd_generic_link_add_one_symbol
6038 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6040 get_elf_backend_data (dynobj)->collect, &bh)))
6042 h = (struct elf_link_hash_entry *) bh;
6045 h->type = STT_OBJECT;
6046 h->verinfo.vertree = NULL;
6048 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6051 /* Create a duplicate of the base version with the same
6052 aux block, but different flags. */
6055 def.vd_aux = sizeof (Elf_External_Verdef);
6057 def.vd_next = (sizeof (Elf_External_Verdef)
6058 + sizeof (Elf_External_Verdaux));
6061 _bfd_elf_swap_verdef_out (output_bfd, &def,
6062 (Elf_External_Verdef *) p);
6063 p += sizeof (Elf_External_Verdef);
6065 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6066 (Elf_External_Verdaux *) p);
6067 p += sizeof (Elf_External_Verdaux);
6069 for (t = verdefs; t != NULL; t = t->next)
6072 struct bfd_elf_version_deps *n;
6074 /* Don't emit the base version twice. */
6079 for (n = t->deps; n != NULL; n = n->next)
6082 /* Add a symbol representing this version. */
6084 if (! (_bfd_generic_link_add_one_symbol
6085 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6087 get_elf_backend_data (dynobj)->collect, &bh)))
6089 h = (struct elf_link_hash_entry *) bh;
6092 h->type = STT_OBJECT;
6093 h->verinfo.vertree = t;
6095 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6098 def.vd_version = VER_DEF_CURRENT;
6100 if (t->globals.list == NULL
6101 && t->locals.list == NULL
6103 def.vd_flags |= VER_FLG_WEAK;
6104 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6105 def.vd_cnt = cdeps + 1;
6106 def.vd_hash = bfd_elf_hash (t->name);
6107 def.vd_aux = sizeof (Elf_External_Verdef);
6110 /* If a basever node is next, it *must* be the last node in
6111 the chain, otherwise Verdef construction breaks. */
6112 if (t->next != NULL && t->next->vernum == 0)
6113 BFD_ASSERT (t->next->next == NULL);
6115 if (t->next != NULL && t->next->vernum != 0)
6116 def.vd_next = (sizeof (Elf_External_Verdef)
6117 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6119 _bfd_elf_swap_verdef_out (output_bfd, &def,
6120 (Elf_External_Verdef *) p);
6121 p += sizeof (Elf_External_Verdef);
6123 defaux.vda_name = h->dynstr_index;
6124 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6126 defaux.vda_next = 0;
6127 if (t->deps != NULL)
6128 defaux.vda_next = sizeof (Elf_External_Verdaux);
6129 t->name_indx = defaux.vda_name;
6131 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6132 (Elf_External_Verdaux *) p);
6133 p += sizeof (Elf_External_Verdaux);
6135 for (n = t->deps; n != NULL; n = n->next)
6137 if (n->version_needed == NULL)
6139 /* This can happen if there was an error in the
6141 defaux.vda_name = 0;
6145 defaux.vda_name = n->version_needed->name_indx;
6146 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6149 if (n->next == NULL)
6150 defaux.vda_next = 0;
6152 defaux.vda_next = sizeof (Elf_External_Verdaux);
6154 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6155 (Elf_External_Verdaux *) p);
6156 p += sizeof (Elf_External_Verdaux);
6160 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6161 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6164 elf_tdata (output_bfd)->cverdefs = cdefs;
6167 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6169 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6172 else if (info->flags & DF_BIND_NOW)
6174 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6180 if (info->executable)
6181 info->flags_1 &= ~ (DF_1_INITFIRST
6184 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6188 /* Work out the size of the version reference section. */
6190 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6191 BFD_ASSERT (s != NULL);
6193 struct elf_find_verdep_info sinfo;
6196 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6197 if (sinfo.vers == 0)
6199 sinfo.failed = FALSE;
6201 elf_link_hash_traverse (elf_hash_table (info),
6202 _bfd_elf_link_find_version_dependencies,
6207 if (elf_tdata (output_bfd)->verref == NULL)
6208 s->flags |= SEC_EXCLUDE;
6211 Elf_Internal_Verneed *t;
6216 /* Build the version dependency section. */
6219 for (t = elf_tdata (output_bfd)->verref;
6223 Elf_Internal_Vernaux *a;
6225 size += sizeof (Elf_External_Verneed);
6227 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6228 size += sizeof (Elf_External_Vernaux);
6232 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6233 if (s->contents == NULL)
6237 for (t = elf_tdata (output_bfd)->verref;
6242 Elf_Internal_Vernaux *a;
6246 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6249 t->vn_version = VER_NEED_CURRENT;
6251 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6252 elf_dt_name (t->vn_bfd) != NULL
6253 ? elf_dt_name (t->vn_bfd)
6254 : lbasename (t->vn_bfd->filename),
6256 if (indx == (bfd_size_type) -1)
6259 t->vn_aux = sizeof (Elf_External_Verneed);
6260 if (t->vn_nextref == NULL)
6263 t->vn_next = (sizeof (Elf_External_Verneed)
6264 + caux * sizeof (Elf_External_Vernaux));
6266 _bfd_elf_swap_verneed_out (output_bfd, t,
6267 (Elf_External_Verneed *) p);
6268 p += sizeof (Elf_External_Verneed);
6270 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6272 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6273 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6274 a->vna_nodename, FALSE);
6275 if (indx == (bfd_size_type) -1)
6278 if (a->vna_nextptr == NULL)
6281 a->vna_next = sizeof (Elf_External_Vernaux);
6283 _bfd_elf_swap_vernaux_out (output_bfd, a,
6284 (Elf_External_Vernaux *) p);
6285 p += sizeof (Elf_External_Vernaux);
6289 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6290 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6293 elf_tdata (output_bfd)->cverrefs = crefs;
6297 if ((elf_tdata (output_bfd)->cverrefs == 0
6298 && elf_tdata (output_bfd)->cverdefs == 0)
6299 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6300 §ion_sym_count) == 0)
6302 s = bfd_get_linker_section (dynobj, ".gnu.version");
6303 s->flags |= SEC_EXCLUDE;
6309 /* Find the first non-excluded output section. We'll use its
6310 section symbol for some emitted relocs. */
6312 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6316 for (s = output_bfd->sections; s != NULL; s = s->next)
6317 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6318 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6320 elf_hash_table (info)->text_index_section = s;
6325 /* Find two non-excluded output sections, one for code, one for data.
6326 We'll use their section symbols for some emitted relocs. */
6328 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6332 /* Data first, since setting text_index_section changes
6333 _bfd_elf_link_omit_section_dynsym. */
6334 for (s = output_bfd->sections; s != NULL; s = s->next)
6335 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6336 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6338 elf_hash_table (info)->data_index_section = s;
6342 for (s = output_bfd->sections; s != NULL; s = s->next)
6343 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6344 == (SEC_ALLOC | SEC_READONLY))
6345 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6347 elf_hash_table (info)->text_index_section = s;
6351 if (elf_hash_table (info)->text_index_section == NULL)
6352 elf_hash_table (info)->text_index_section
6353 = elf_hash_table (info)->data_index_section;
6357 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6359 const struct elf_backend_data *bed;
6361 if (!is_elf_hash_table (info->hash))
6364 bed = get_elf_backend_data (output_bfd);
6365 (*bed->elf_backend_init_index_section) (output_bfd, info);
6367 if (elf_hash_table (info)->dynamic_sections_created)
6371 bfd_size_type dynsymcount;
6372 unsigned long section_sym_count;
6373 unsigned int dtagcount;
6375 dynobj = elf_hash_table (info)->dynobj;
6377 /* Assign dynsym indicies. In a shared library we generate a
6378 section symbol for each output section, which come first.
6379 Next come all of the back-end allocated local dynamic syms,
6380 followed by the rest of the global symbols. */
6382 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6383 §ion_sym_count);
6385 /* Work out the size of the symbol version section. */
6386 s = bfd_get_linker_section (dynobj, ".gnu.version");
6387 BFD_ASSERT (s != NULL);
6388 if (dynsymcount != 0
6389 && (s->flags & SEC_EXCLUDE) == 0)
6391 s->size = dynsymcount * sizeof (Elf_External_Versym);
6392 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6393 if (s->contents == NULL)
6396 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6400 /* Set the size of the .dynsym and .hash sections. We counted
6401 the number of dynamic symbols in elf_link_add_object_symbols.
6402 We will build the contents of .dynsym and .hash when we build
6403 the final symbol table, because until then we do not know the
6404 correct value to give the symbols. We built the .dynstr
6405 section as we went along in elf_link_add_object_symbols. */
6406 s = bfd_get_linker_section (dynobj, ".dynsym");
6407 BFD_ASSERT (s != NULL);
6408 s->size = dynsymcount * bed->s->sizeof_sym;
6410 if (dynsymcount != 0)
6412 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6413 if (s->contents == NULL)
6416 /* The first entry in .dynsym is a dummy symbol.
6417 Clear all the section syms, in case we don't output them all. */
6418 ++section_sym_count;
6419 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6422 elf_hash_table (info)->bucketcount = 0;
6424 /* Compute the size of the hashing table. As a side effect this
6425 computes the hash values for all the names we export. */
6426 if (info->emit_hash)
6428 unsigned long int *hashcodes;
6429 struct hash_codes_info hashinf;
6431 unsigned long int nsyms;
6433 size_t hash_entry_size;
6435 /* Compute the hash values for all exported symbols. At the same
6436 time store the values in an array so that we could use them for
6438 amt = dynsymcount * sizeof (unsigned long int);
6439 hashcodes = (unsigned long int *) bfd_malloc (amt);
6440 if (hashcodes == NULL)
6442 hashinf.hashcodes = hashcodes;
6443 hashinf.error = FALSE;
6445 /* Put all hash values in HASHCODES. */
6446 elf_link_hash_traverse (elf_hash_table (info),
6447 elf_collect_hash_codes, &hashinf);
6454 nsyms = hashinf.hashcodes - hashcodes;
6456 = compute_bucket_count (info, hashcodes, nsyms, 0);
6459 if (bucketcount == 0)
6462 elf_hash_table (info)->bucketcount = bucketcount;
6464 s = bfd_get_linker_section (dynobj, ".hash");
6465 BFD_ASSERT (s != NULL);
6466 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6467 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6468 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6469 if (s->contents == NULL)
6472 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6473 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6474 s->contents + hash_entry_size);
6477 if (info->emit_gnu_hash)
6480 unsigned char *contents;
6481 struct collect_gnu_hash_codes cinfo;
6485 memset (&cinfo, 0, sizeof (cinfo));
6487 /* Compute the hash values for all exported symbols. At the same
6488 time store the values in an array so that we could use them for
6490 amt = dynsymcount * 2 * sizeof (unsigned long int);
6491 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6492 if (cinfo.hashcodes == NULL)
6495 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6496 cinfo.min_dynindx = -1;
6497 cinfo.output_bfd = output_bfd;
6500 /* Put all hash values in HASHCODES. */
6501 elf_link_hash_traverse (elf_hash_table (info),
6502 elf_collect_gnu_hash_codes, &cinfo);
6505 free (cinfo.hashcodes);
6510 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6512 if (bucketcount == 0)
6514 free (cinfo.hashcodes);
6518 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6519 BFD_ASSERT (s != NULL);
6521 if (cinfo.nsyms == 0)
6523 /* Empty .gnu.hash section is special. */
6524 BFD_ASSERT (cinfo.min_dynindx == -1);
6525 free (cinfo.hashcodes);
6526 s->size = 5 * 4 + bed->s->arch_size / 8;
6527 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6528 if (contents == NULL)
6530 s->contents = contents;
6531 /* 1 empty bucket. */
6532 bfd_put_32 (output_bfd, 1, contents);
6533 /* SYMIDX above the special symbol 0. */
6534 bfd_put_32 (output_bfd, 1, contents + 4);
6535 /* Just one word for bitmask. */
6536 bfd_put_32 (output_bfd, 1, contents + 8);
6537 /* Only hash fn bloom filter. */
6538 bfd_put_32 (output_bfd, 0, contents + 12);
6539 /* No hashes are valid - empty bitmask. */
6540 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6541 /* No hashes in the only bucket. */
6542 bfd_put_32 (output_bfd, 0,
6543 contents + 16 + bed->s->arch_size / 8);
6547 unsigned long int maskwords, maskbitslog2, x;
6548 BFD_ASSERT (cinfo.min_dynindx != -1);
6552 while ((x >>= 1) != 0)
6554 if (maskbitslog2 < 3)
6556 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6557 maskbitslog2 = maskbitslog2 + 3;
6559 maskbitslog2 = maskbitslog2 + 2;
6560 if (bed->s->arch_size == 64)
6562 if (maskbitslog2 == 5)
6568 cinfo.mask = (1 << cinfo.shift1) - 1;
6569 cinfo.shift2 = maskbitslog2;
6570 cinfo.maskbits = 1 << maskbitslog2;
6571 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6572 amt = bucketcount * sizeof (unsigned long int) * 2;
6573 amt += maskwords * sizeof (bfd_vma);
6574 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6575 if (cinfo.bitmask == NULL)
6577 free (cinfo.hashcodes);
6581 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6582 cinfo.indx = cinfo.counts + bucketcount;
6583 cinfo.symindx = dynsymcount - cinfo.nsyms;
6584 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6586 /* Determine how often each hash bucket is used. */
6587 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6588 for (i = 0; i < cinfo.nsyms; ++i)
6589 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6591 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6592 if (cinfo.counts[i] != 0)
6594 cinfo.indx[i] = cnt;
6595 cnt += cinfo.counts[i];
6597 BFD_ASSERT (cnt == dynsymcount);
6598 cinfo.bucketcount = bucketcount;
6599 cinfo.local_indx = cinfo.min_dynindx;
6601 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6602 s->size += cinfo.maskbits / 8;
6603 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6604 if (contents == NULL)
6606 free (cinfo.bitmask);
6607 free (cinfo.hashcodes);
6611 s->contents = contents;
6612 bfd_put_32 (output_bfd, bucketcount, contents);
6613 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6614 bfd_put_32 (output_bfd, maskwords, contents + 8);
6615 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6616 contents += 16 + cinfo.maskbits / 8;
6618 for (i = 0; i < bucketcount; ++i)
6620 if (cinfo.counts[i] == 0)
6621 bfd_put_32 (output_bfd, 0, contents);
6623 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6627 cinfo.contents = contents;
6629 /* Renumber dynamic symbols, populate .gnu.hash section. */
6630 elf_link_hash_traverse (elf_hash_table (info),
6631 elf_renumber_gnu_hash_syms, &cinfo);
6633 contents = s->contents + 16;
6634 for (i = 0; i < maskwords; ++i)
6636 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6638 contents += bed->s->arch_size / 8;
6641 free (cinfo.bitmask);
6642 free (cinfo.hashcodes);
6646 s = bfd_get_linker_section (dynobj, ".dynstr");
6647 BFD_ASSERT (s != NULL);
6649 elf_finalize_dynstr (output_bfd, info);
6651 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6653 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6654 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6661 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6664 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6667 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6668 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6671 /* Finish SHF_MERGE section merging. */
6674 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6679 if (!is_elf_hash_table (info->hash))
6682 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6683 if ((ibfd->flags & DYNAMIC) == 0)
6684 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6685 if ((sec->flags & SEC_MERGE) != 0
6686 && !bfd_is_abs_section (sec->output_section))
6688 struct bfd_elf_section_data *secdata;
6690 secdata = elf_section_data (sec);
6691 if (! _bfd_add_merge_section (abfd,
6692 &elf_hash_table (info)->merge_info,
6693 sec, &secdata->sec_info))
6695 else if (secdata->sec_info)
6696 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6699 if (elf_hash_table (info)->merge_info != NULL)
6700 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6701 merge_sections_remove_hook);
6705 /* Create an entry in an ELF linker hash table. */
6707 struct bfd_hash_entry *
6708 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6709 struct bfd_hash_table *table,
6712 /* Allocate the structure if it has not already been allocated by a
6716 entry = (struct bfd_hash_entry *)
6717 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6722 /* Call the allocation method of the superclass. */
6723 entry = _bfd_link_hash_newfunc (entry, table, string);
6726 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6727 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6729 /* Set local fields. */
6732 ret->got = htab->init_got_refcount;
6733 ret->plt = htab->init_plt_refcount;
6734 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6735 - offsetof (struct elf_link_hash_entry, size)));
6736 /* Assume that we have been called by a non-ELF symbol reader.
6737 This flag is then reset by the code which reads an ELF input
6738 file. This ensures that a symbol created by a non-ELF symbol
6739 reader will have the flag set correctly. */
6746 /* Copy data from an indirect symbol to its direct symbol, hiding the
6747 old indirect symbol. Also used for copying flags to a weakdef. */
6750 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6751 struct elf_link_hash_entry *dir,
6752 struct elf_link_hash_entry *ind)
6754 struct elf_link_hash_table *htab;
6756 /* Copy down any references that we may have already seen to the
6757 symbol which just became indirect. */
6759 dir->ref_dynamic |= ind->ref_dynamic;
6760 dir->ref_regular |= ind->ref_regular;
6761 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6762 dir->non_got_ref |= ind->non_got_ref;
6763 dir->needs_plt |= ind->needs_plt;
6764 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6766 if (ind->root.type != bfd_link_hash_indirect)
6769 /* Copy over the global and procedure linkage table refcount entries.
6770 These may have been already set up by a check_relocs routine. */
6771 htab = elf_hash_table (info);
6772 if (ind->got.refcount > htab->init_got_refcount.refcount)
6774 if (dir->got.refcount < 0)
6775 dir->got.refcount = 0;
6776 dir->got.refcount += ind->got.refcount;
6777 ind->got.refcount = htab->init_got_refcount.refcount;
6780 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6782 if (dir->plt.refcount < 0)
6783 dir->plt.refcount = 0;
6784 dir->plt.refcount += ind->plt.refcount;
6785 ind->plt.refcount = htab->init_plt_refcount.refcount;
6788 if (ind->dynindx != -1)
6790 if (dir->dynindx != -1)
6791 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6792 dir->dynindx = ind->dynindx;
6793 dir->dynstr_index = ind->dynstr_index;
6795 ind->dynstr_index = 0;
6800 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6801 struct elf_link_hash_entry *h,
6802 bfd_boolean force_local)
6804 /* STT_GNU_IFUNC symbol must go through PLT. */
6805 if (h->type != STT_GNU_IFUNC)
6807 h->plt = elf_hash_table (info)->init_plt_offset;
6812 h->forced_local = 1;
6813 if (h->dynindx != -1)
6816 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6822 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
6826 _bfd_elf_link_hash_table_init
6827 (struct elf_link_hash_table *table,
6829 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6830 struct bfd_hash_table *,
6832 unsigned int entsize,
6833 enum elf_target_id target_id)
6836 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6838 table->init_got_refcount.refcount = can_refcount - 1;
6839 table->init_plt_refcount.refcount = can_refcount - 1;
6840 table->init_got_offset.offset = -(bfd_vma) 1;
6841 table->init_plt_offset.offset = -(bfd_vma) 1;
6842 /* The first dynamic symbol is a dummy. */
6843 table->dynsymcount = 1;
6845 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6847 table->root.type = bfd_link_elf_hash_table;
6848 table->hash_table_id = target_id;
6853 /* Create an ELF linker hash table. */
6855 struct bfd_link_hash_table *
6856 _bfd_elf_link_hash_table_create (bfd *abfd)
6858 struct elf_link_hash_table *ret;
6859 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6861 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
6865 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6866 sizeof (struct elf_link_hash_entry),
6872 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
6877 /* Destroy an ELF linker hash table. */
6880 _bfd_elf_link_hash_table_free (bfd *obfd)
6882 struct elf_link_hash_table *htab;
6884 htab = (struct elf_link_hash_table *) obfd->link.hash;
6885 if (htab->dynstr != NULL)
6886 _bfd_elf_strtab_free (htab->dynstr);
6887 _bfd_merge_sections_free (htab->merge_info);
6888 _bfd_generic_link_hash_table_free (obfd);
6891 /* This is a hook for the ELF emulation code in the generic linker to
6892 tell the backend linker what file name to use for the DT_NEEDED
6893 entry for a dynamic object. */
6896 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6898 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6899 && bfd_get_format (abfd) == bfd_object)
6900 elf_dt_name (abfd) = name;
6904 bfd_elf_get_dyn_lib_class (bfd *abfd)
6907 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6908 && bfd_get_format (abfd) == bfd_object)
6909 lib_class = elf_dyn_lib_class (abfd);
6916 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6918 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6919 && bfd_get_format (abfd) == bfd_object)
6920 elf_dyn_lib_class (abfd) = lib_class;
6923 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6924 the linker ELF emulation code. */
6926 struct bfd_link_needed_list *
6927 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6928 struct bfd_link_info *info)
6930 if (! is_elf_hash_table (info->hash))
6932 return elf_hash_table (info)->needed;
6935 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6936 hook for the linker ELF emulation code. */
6938 struct bfd_link_needed_list *
6939 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6940 struct bfd_link_info *info)
6942 if (! is_elf_hash_table (info->hash))
6944 return elf_hash_table (info)->runpath;
6947 /* Get the name actually used for a dynamic object for a link. This
6948 is the SONAME entry if there is one. Otherwise, it is the string
6949 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6952 bfd_elf_get_dt_soname (bfd *abfd)
6954 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6955 && bfd_get_format (abfd) == bfd_object)
6956 return elf_dt_name (abfd);
6960 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6961 the ELF linker emulation code. */
6964 bfd_elf_get_bfd_needed_list (bfd *abfd,
6965 struct bfd_link_needed_list **pneeded)
6968 bfd_byte *dynbuf = NULL;
6969 unsigned int elfsec;
6970 unsigned long shlink;
6971 bfd_byte *extdyn, *extdynend;
6973 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6977 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6978 || bfd_get_format (abfd) != bfd_object)
6981 s = bfd_get_section_by_name (abfd, ".dynamic");
6982 if (s == NULL || s->size == 0)
6985 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6988 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6989 if (elfsec == SHN_BAD)
6992 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6994 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6995 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
6998 extdynend = extdyn + s->size;
6999 for (; extdyn < extdynend; extdyn += extdynsize)
7001 Elf_Internal_Dyn dyn;
7003 (*swap_dyn_in) (abfd, extdyn, &dyn);
7005 if (dyn.d_tag == DT_NULL)
7008 if (dyn.d_tag == DT_NEEDED)
7011 struct bfd_link_needed_list *l;
7012 unsigned int tagv = dyn.d_un.d_val;
7015 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7020 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7041 struct elf_symbuf_symbol
7043 unsigned long st_name; /* Symbol name, index in string tbl */
7044 unsigned char st_info; /* Type and binding attributes */
7045 unsigned char st_other; /* Visibilty, and target specific */
7048 struct elf_symbuf_head
7050 struct elf_symbuf_symbol *ssym;
7051 bfd_size_type count;
7052 unsigned int st_shndx;
7059 Elf_Internal_Sym *isym;
7060 struct elf_symbuf_symbol *ssym;
7065 /* Sort references to symbols by ascending section number. */
7068 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7070 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7071 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7073 return s1->st_shndx - s2->st_shndx;
7077 elf_sym_name_compare (const void *arg1, const void *arg2)
7079 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7080 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7081 return strcmp (s1->name, s2->name);
7084 static struct elf_symbuf_head *
7085 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7087 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7088 struct elf_symbuf_symbol *ssym;
7089 struct elf_symbuf_head *ssymbuf, *ssymhead;
7090 bfd_size_type i, shndx_count, total_size;
7092 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7096 for (ind = indbuf, i = 0; i < symcount; i++)
7097 if (isymbuf[i].st_shndx != SHN_UNDEF)
7098 *ind++ = &isymbuf[i];
7101 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7102 elf_sort_elf_symbol);
7105 if (indbufend > indbuf)
7106 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7107 if (ind[0]->st_shndx != ind[1]->st_shndx)
7110 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7111 + (indbufend - indbuf) * sizeof (*ssym));
7112 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7113 if (ssymbuf == NULL)
7119 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7120 ssymbuf->ssym = NULL;
7121 ssymbuf->count = shndx_count;
7122 ssymbuf->st_shndx = 0;
7123 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7125 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7128 ssymhead->ssym = ssym;
7129 ssymhead->count = 0;
7130 ssymhead->st_shndx = (*ind)->st_shndx;
7132 ssym->st_name = (*ind)->st_name;
7133 ssym->st_info = (*ind)->st_info;
7134 ssym->st_other = (*ind)->st_other;
7137 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7138 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7145 /* Check if 2 sections define the same set of local and global
7149 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7150 struct bfd_link_info *info)
7153 const struct elf_backend_data *bed1, *bed2;
7154 Elf_Internal_Shdr *hdr1, *hdr2;
7155 bfd_size_type symcount1, symcount2;
7156 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7157 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7158 Elf_Internal_Sym *isym, *isymend;
7159 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7160 bfd_size_type count1, count2, i;
7161 unsigned int shndx1, shndx2;
7167 /* Both sections have to be in ELF. */
7168 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7169 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7172 if (elf_section_type (sec1) != elf_section_type (sec2))
7175 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7176 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7177 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7180 bed1 = get_elf_backend_data (bfd1);
7181 bed2 = get_elf_backend_data (bfd2);
7182 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7183 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7184 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7185 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7187 if (symcount1 == 0 || symcount2 == 0)
7193 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7194 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7196 if (ssymbuf1 == NULL)
7198 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7200 if (isymbuf1 == NULL)
7203 if (!info->reduce_memory_overheads)
7204 elf_tdata (bfd1)->symbuf = ssymbuf1
7205 = elf_create_symbuf (symcount1, isymbuf1);
7208 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7210 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7212 if (isymbuf2 == NULL)
7215 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7216 elf_tdata (bfd2)->symbuf = ssymbuf2
7217 = elf_create_symbuf (symcount2, isymbuf2);
7220 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7222 /* Optimized faster version. */
7223 bfd_size_type lo, hi, mid;
7224 struct elf_symbol *symp;
7225 struct elf_symbuf_symbol *ssym, *ssymend;
7228 hi = ssymbuf1->count;
7233 mid = (lo + hi) / 2;
7234 if (shndx1 < ssymbuf1[mid].st_shndx)
7236 else if (shndx1 > ssymbuf1[mid].st_shndx)
7240 count1 = ssymbuf1[mid].count;
7247 hi = ssymbuf2->count;
7252 mid = (lo + hi) / 2;
7253 if (shndx2 < ssymbuf2[mid].st_shndx)
7255 else if (shndx2 > ssymbuf2[mid].st_shndx)
7259 count2 = ssymbuf2[mid].count;
7265 if (count1 == 0 || count2 == 0 || count1 != count2)
7268 symtable1 = (struct elf_symbol *)
7269 bfd_malloc (count1 * sizeof (struct elf_symbol));
7270 symtable2 = (struct elf_symbol *)
7271 bfd_malloc (count2 * sizeof (struct elf_symbol));
7272 if (symtable1 == NULL || symtable2 == NULL)
7276 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7277 ssym < ssymend; ssym++, symp++)
7279 symp->u.ssym = ssym;
7280 symp->name = bfd_elf_string_from_elf_section (bfd1,
7286 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7287 ssym < ssymend; ssym++, symp++)
7289 symp->u.ssym = ssym;
7290 symp->name = bfd_elf_string_from_elf_section (bfd2,
7295 /* Sort symbol by name. */
7296 qsort (symtable1, count1, sizeof (struct elf_symbol),
7297 elf_sym_name_compare);
7298 qsort (symtable2, count1, sizeof (struct elf_symbol),
7299 elf_sym_name_compare);
7301 for (i = 0; i < count1; i++)
7302 /* Two symbols must have the same binding, type and name. */
7303 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7304 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7305 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7312 symtable1 = (struct elf_symbol *)
7313 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7314 symtable2 = (struct elf_symbol *)
7315 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7316 if (symtable1 == NULL || symtable2 == NULL)
7319 /* Count definitions in the section. */
7321 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7322 if (isym->st_shndx == shndx1)
7323 symtable1[count1++].u.isym = isym;
7326 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7327 if (isym->st_shndx == shndx2)
7328 symtable2[count2++].u.isym = isym;
7330 if (count1 == 0 || count2 == 0 || count1 != count2)
7333 for (i = 0; i < count1; i++)
7335 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7336 symtable1[i].u.isym->st_name);
7338 for (i = 0; i < count2; i++)
7340 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7341 symtable2[i].u.isym->st_name);
7343 /* Sort symbol by name. */
7344 qsort (symtable1, count1, sizeof (struct elf_symbol),
7345 elf_sym_name_compare);
7346 qsort (symtable2, count1, sizeof (struct elf_symbol),
7347 elf_sym_name_compare);
7349 for (i = 0; i < count1; i++)
7350 /* Two symbols must have the same binding, type and name. */
7351 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7352 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7353 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7371 /* Return TRUE if 2 section types are compatible. */
7374 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7375 bfd *bbfd, const asection *bsec)
7379 || abfd->xvec->flavour != bfd_target_elf_flavour
7380 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7383 return elf_section_type (asec) == elf_section_type (bsec);
7386 /* Final phase of ELF linker. */
7388 /* A structure we use to avoid passing large numbers of arguments. */
7390 struct elf_final_link_info
7392 /* General link information. */
7393 struct bfd_link_info *info;
7396 /* Symbol string table. */
7397 struct bfd_strtab_hash *symstrtab;
7398 /* .dynsym section. */
7399 asection *dynsym_sec;
7400 /* .hash section. */
7402 /* symbol version section (.gnu.version). */
7403 asection *symver_sec;
7404 /* Buffer large enough to hold contents of any section. */
7406 /* Buffer large enough to hold external relocs of any section. */
7407 void *external_relocs;
7408 /* Buffer large enough to hold internal relocs of any section. */
7409 Elf_Internal_Rela *internal_relocs;
7410 /* Buffer large enough to hold external local symbols of any input
7412 bfd_byte *external_syms;
7413 /* And a buffer for symbol section indices. */
7414 Elf_External_Sym_Shndx *locsym_shndx;
7415 /* Buffer large enough to hold internal local symbols of any input
7417 Elf_Internal_Sym *internal_syms;
7418 /* Array large enough to hold a symbol index for each local symbol
7419 of any input BFD. */
7421 /* Array large enough to hold a section pointer for each local
7422 symbol of any input BFD. */
7423 asection **sections;
7424 /* Buffer to hold swapped out symbols. */
7426 /* And one for symbol section indices. */
7427 Elf_External_Sym_Shndx *symshndxbuf;
7428 /* Number of swapped out symbols in buffer. */
7429 size_t symbuf_count;
7430 /* Number of symbols which fit in symbuf. */
7432 /* And same for symshndxbuf. */
7433 size_t shndxbuf_size;
7434 /* Number of STT_FILE syms seen. */
7435 size_t filesym_count;
7438 /* This struct is used to pass information to elf_link_output_extsym. */
7440 struct elf_outext_info
7443 bfd_boolean localsyms;
7444 bfd_boolean need_second_pass;
7445 bfd_boolean second_pass;
7446 bfd_boolean file_sym_done;
7447 struct elf_final_link_info *flinfo;
7451 /* Support for evaluating a complex relocation.
7453 Complex relocations are generalized, self-describing relocations. The
7454 implementation of them consists of two parts: complex symbols, and the
7455 relocations themselves.
7457 The relocations are use a reserved elf-wide relocation type code (R_RELC
7458 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7459 information (start bit, end bit, word width, etc) into the addend. This
7460 information is extracted from CGEN-generated operand tables within gas.
7462 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7463 internal) representing prefix-notation expressions, including but not
7464 limited to those sorts of expressions normally encoded as addends in the
7465 addend field. The symbol mangling format is:
7468 | <unary-operator> ':' <node>
7469 | <binary-operator> ':' <node> ':' <node>
7472 <literal> := 's' <digits=N> ':' <N character symbol name>
7473 | 'S' <digits=N> ':' <N character section name>
7477 <binary-operator> := as in C
7478 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7481 set_symbol_value (bfd *bfd_with_globals,
7482 Elf_Internal_Sym *isymbuf,
7487 struct elf_link_hash_entry **sym_hashes;
7488 struct elf_link_hash_entry *h;
7489 size_t extsymoff = locsymcount;
7491 if (symidx < locsymcount)
7493 Elf_Internal_Sym *sym;
7495 sym = isymbuf + symidx;
7496 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7498 /* It is a local symbol: move it to the
7499 "absolute" section and give it a value. */
7500 sym->st_shndx = SHN_ABS;
7501 sym->st_value = val;
7504 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7508 /* It is a global symbol: set its link type
7509 to "defined" and give it a value. */
7511 sym_hashes = elf_sym_hashes (bfd_with_globals);
7512 h = sym_hashes [symidx - extsymoff];
7513 while (h->root.type == bfd_link_hash_indirect
7514 || h->root.type == bfd_link_hash_warning)
7515 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7516 h->root.type = bfd_link_hash_defined;
7517 h->root.u.def.value = val;
7518 h->root.u.def.section = bfd_abs_section_ptr;
7522 resolve_symbol (const char *name,
7524 struct elf_final_link_info *flinfo,
7526 Elf_Internal_Sym *isymbuf,
7529 Elf_Internal_Sym *sym;
7530 struct bfd_link_hash_entry *global_entry;
7531 const char *candidate = NULL;
7532 Elf_Internal_Shdr *symtab_hdr;
7535 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7537 for (i = 0; i < locsymcount; ++ i)
7541 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7544 candidate = bfd_elf_string_from_elf_section (input_bfd,
7545 symtab_hdr->sh_link,
7548 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7549 name, candidate, (unsigned long) sym->st_value);
7551 if (candidate && strcmp (candidate, name) == 0)
7553 asection *sec = flinfo->sections [i];
7555 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7556 *result += sec->output_offset + sec->output_section->vma;
7558 printf ("Found symbol with value %8.8lx\n",
7559 (unsigned long) *result);
7565 /* Hmm, haven't found it yet. perhaps it is a global. */
7566 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7567 FALSE, FALSE, TRUE);
7571 if (global_entry->type == bfd_link_hash_defined
7572 || global_entry->type == bfd_link_hash_defweak)
7574 *result = (global_entry->u.def.value
7575 + global_entry->u.def.section->output_section->vma
7576 + global_entry->u.def.section->output_offset);
7578 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7579 global_entry->root.string, (unsigned long) *result);
7588 resolve_section (const char *name,
7595 for (curr = sections; curr; curr = curr->next)
7596 if (strcmp (curr->name, name) == 0)
7598 *result = curr->vma;
7602 /* Hmm. still haven't found it. try pseudo-section names. */
7603 for (curr = sections; curr; curr = curr->next)
7605 len = strlen (curr->name);
7606 if (len > strlen (name))
7609 if (strncmp (curr->name, name, len) == 0)
7611 if (strncmp (".end", name + len, 4) == 0)
7613 *result = curr->vma + curr->size;
7617 /* Insert more pseudo-section names here, if you like. */
7625 undefined_reference (const char *reftype, const char *name)
7627 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7632 eval_symbol (bfd_vma *result,
7635 struct elf_final_link_info *flinfo,
7637 Elf_Internal_Sym *isymbuf,
7646 const char *sym = *symp;
7648 bfd_boolean symbol_is_section = FALSE;
7653 if (len < 1 || len > sizeof (symbuf))
7655 bfd_set_error (bfd_error_invalid_operation);
7668 *result = strtoul (sym, (char **) symp, 16);
7672 symbol_is_section = TRUE;
7675 symlen = strtol (sym, (char **) symp, 10);
7676 sym = *symp + 1; /* Skip the trailing ':'. */
7678 if (symend < sym || symlen + 1 > sizeof (symbuf))
7680 bfd_set_error (bfd_error_invalid_operation);
7684 memcpy (symbuf, sym, symlen);
7685 symbuf[symlen] = '\0';
7686 *symp = sym + symlen;
7688 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7689 the symbol as a section, or vice-versa. so we're pretty liberal in our
7690 interpretation here; section means "try section first", not "must be a
7691 section", and likewise with symbol. */
7693 if (symbol_is_section)
7695 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result)
7696 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7697 isymbuf, locsymcount))
7699 undefined_reference ("section", symbuf);
7705 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7706 isymbuf, locsymcount)
7707 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7710 undefined_reference ("symbol", symbuf);
7717 /* All that remains are operators. */
7719 #define UNARY_OP(op) \
7720 if (strncmp (sym, #op, strlen (#op)) == 0) \
7722 sym += strlen (#op); \
7726 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7727 isymbuf, locsymcount, signed_p)) \
7730 *result = op ((bfd_signed_vma) a); \
7736 #define BINARY_OP(op) \
7737 if (strncmp (sym, #op, strlen (#op)) == 0) \
7739 sym += strlen (#op); \
7743 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7744 isymbuf, locsymcount, signed_p)) \
7747 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7748 isymbuf, locsymcount, signed_p)) \
7751 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7781 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7782 bfd_set_error (bfd_error_invalid_operation);
7788 put_value (bfd_vma size,
7789 unsigned long chunksz,
7794 location += (size - chunksz);
7796 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7804 bfd_put_8 (input_bfd, x, location);
7807 bfd_put_16 (input_bfd, x, location);
7810 bfd_put_32 (input_bfd, x, location);
7814 bfd_put_64 (input_bfd, x, location);
7824 get_value (bfd_vma size,
7825 unsigned long chunksz,
7832 /* Sanity checks. */
7833 BFD_ASSERT (chunksz <= sizeof (x)
7836 && (size % chunksz) == 0
7837 && input_bfd != NULL
7838 && location != NULL);
7840 if (chunksz == sizeof (x))
7842 BFD_ASSERT (size == chunksz);
7844 /* Make sure that we do not perform an undefined shift operation.
7845 We know that size == chunksz so there will only be one iteration
7846 of the loop below. */
7850 shift = 8 * chunksz;
7852 for (; size; size -= chunksz, location += chunksz)
7857 x = (x << shift) | bfd_get_8 (input_bfd, location);
7860 x = (x << shift) | bfd_get_16 (input_bfd, location);
7863 x = (x << shift) | bfd_get_32 (input_bfd, location);
7867 x = (x << shift) | bfd_get_64 (input_bfd, location);
7878 decode_complex_addend (unsigned long *start, /* in bits */
7879 unsigned long *oplen, /* in bits */
7880 unsigned long *len, /* in bits */
7881 unsigned long *wordsz, /* in bytes */
7882 unsigned long *chunksz, /* in bytes */
7883 unsigned long *lsb0_p,
7884 unsigned long *signed_p,
7885 unsigned long *trunc_p,
7886 unsigned long encoded)
7888 * start = encoded & 0x3F;
7889 * len = (encoded >> 6) & 0x3F;
7890 * oplen = (encoded >> 12) & 0x3F;
7891 * wordsz = (encoded >> 18) & 0xF;
7892 * chunksz = (encoded >> 22) & 0xF;
7893 * lsb0_p = (encoded >> 27) & 1;
7894 * signed_p = (encoded >> 28) & 1;
7895 * trunc_p = (encoded >> 29) & 1;
7898 bfd_reloc_status_type
7899 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7900 asection *input_section ATTRIBUTE_UNUSED,
7902 Elf_Internal_Rela *rel,
7905 bfd_vma shift, x, mask;
7906 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7907 bfd_reloc_status_type r;
7909 /* Perform this reloc, since it is complex.
7910 (this is not to say that it necessarily refers to a complex
7911 symbol; merely that it is a self-describing CGEN based reloc.
7912 i.e. the addend has the complete reloc information (bit start, end,
7913 word size, etc) encoded within it.). */
7915 decode_complex_addend (&start, &oplen, &len, &wordsz,
7916 &chunksz, &lsb0_p, &signed_p,
7917 &trunc_p, rel->r_addend);
7919 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7922 shift = (start + 1) - len;
7924 shift = (8 * wordsz) - (start + len);
7926 /* FIXME: octets_per_byte. */
7927 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7930 printf ("Doing complex reloc: "
7931 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7932 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7933 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7934 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7935 oplen, (unsigned long) x, (unsigned long) mask,
7936 (unsigned long) relocation);
7941 /* Now do an overflow check. */
7942 r = bfd_check_overflow ((signed_p
7943 ? complain_overflow_signed
7944 : complain_overflow_unsigned),
7945 len, 0, (8 * wordsz),
7949 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7952 printf (" relocation: %8.8lx\n"
7953 " shifted mask: %8.8lx\n"
7954 " shifted/masked reloc: %8.8lx\n"
7955 " result: %8.8lx\n",
7956 (unsigned long) relocation, (unsigned long) (mask << shift),
7957 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
7959 /* FIXME: octets_per_byte. */
7960 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7964 /* qsort comparison functions sorting external relocs by r_offset. */
7967 cmp_ext32l_r_offset (const void *p, const void *q)
7974 const union aligned32 *a
7975 = (const union aligned32 *) ((const Elf32_External_Rel *) p)->r_offset;
7976 const union aligned32 *b
7977 = (const union aligned32 *) ((const Elf32_External_Rel *) q)->r_offset;
7979 uint32_t aval = ( (uint32_t) a->c[0]
7980 | (uint32_t) a->c[1] << 8
7981 | (uint32_t) a->c[2] << 16
7982 | (uint32_t) a->c[3] << 24);
7983 uint32_t bval = ( (uint32_t) b->c[0]
7984 | (uint32_t) b->c[1] << 8
7985 | (uint32_t) b->c[2] << 16
7986 | (uint32_t) b->c[3] << 24);
7989 else if (aval > bval)
7995 cmp_ext32b_r_offset (const void *p, const void *q)
8002 const union aligned32 *a
8003 = (const union aligned32 *) ((const Elf32_External_Rel *) p)->r_offset;
8004 const union aligned32 *b
8005 = (const union aligned32 *) ((const Elf32_External_Rel *) q)->r_offset;
8007 uint32_t aval = ( (uint32_t) a->c[0] << 24
8008 | (uint32_t) a->c[1] << 16
8009 | (uint32_t) a->c[2] << 8
8010 | (uint32_t) a->c[3]);
8011 uint32_t bval = ( (uint32_t) b->c[0] << 24
8012 | (uint32_t) b->c[1] << 16
8013 | (uint32_t) b->c[2] << 8
8014 | (uint32_t) b->c[3]);
8017 else if (aval > bval)
8022 #ifdef BFD_HOST_64_BIT
8024 cmp_ext64l_r_offset (const void *p, const void *q)
8031 const union aligned64 *a
8032 = (const union aligned64 *) ((const Elf64_External_Rel *) p)->r_offset;
8033 const union aligned64 *b
8034 = (const union aligned64 *) ((const Elf64_External_Rel *) q)->r_offset;
8036 uint64_t aval = ( (uint64_t) a->c[0]
8037 | (uint64_t) a->c[1] << 8
8038 | (uint64_t) a->c[2] << 16
8039 | (uint64_t) a->c[3] << 24
8040 | (uint64_t) a->c[4] << 32
8041 | (uint64_t) a->c[5] << 40
8042 | (uint64_t) a->c[6] << 48
8043 | (uint64_t) a->c[7] << 56);
8044 uint64_t bval = ( (uint64_t) b->c[0]
8045 | (uint64_t) b->c[1] << 8
8046 | (uint64_t) b->c[2] << 16
8047 | (uint64_t) b->c[3] << 24
8048 | (uint64_t) b->c[4] << 32
8049 | (uint64_t) b->c[5] << 40
8050 | (uint64_t) b->c[6] << 48
8051 | (uint64_t) b->c[7] << 56);
8054 else if (aval > bval)
8060 cmp_ext64b_r_offset (const void *p, const void *q)
8067 const union aligned64 *a
8068 = (const union aligned64 *) ((const Elf64_External_Rel *) p)->r_offset;
8069 const union aligned64 *b
8070 = (const union aligned64 *) ((const Elf64_External_Rel *) q)->r_offset;
8072 uint64_t aval = ( (uint64_t) a->c[0] << 56
8073 | (uint64_t) a->c[1] << 48
8074 | (uint64_t) a->c[2] << 40
8075 | (uint64_t) a->c[3] << 32
8076 | (uint64_t) a->c[4] << 24
8077 | (uint64_t) a->c[5] << 16
8078 | (uint64_t) a->c[6] << 8
8079 | (uint64_t) a->c[7]);
8080 uint64_t bval = ( (uint64_t) b->c[0] << 56
8081 | (uint64_t) b->c[1] << 48
8082 | (uint64_t) b->c[2] << 40
8083 | (uint64_t) b->c[3] << 32
8084 | (uint64_t) b->c[4] << 24
8085 | (uint64_t) b->c[5] << 16
8086 | (uint64_t) b->c[6] << 8
8087 | (uint64_t) b->c[7]);
8090 else if (aval > bval)
8096 /* When performing a relocatable link, the input relocations are
8097 preserved. But, if they reference global symbols, the indices
8098 referenced must be updated. Update all the relocations found in
8102 elf_link_adjust_relocs (bfd *abfd,
8103 struct bfd_elf_section_reloc_data *reldata,
8107 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8109 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8110 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8111 bfd_vma r_type_mask;
8113 unsigned int count = reldata->count;
8114 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8116 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8118 swap_in = bed->s->swap_reloc_in;
8119 swap_out = bed->s->swap_reloc_out;
8121 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8123 swap_in = bed->s->swap_reloca_in;
8124 swap_out = bed->s->swap_reloca_out;
8129 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8132 if (bed->s->arch_size == 32)
8139 r_type_mask = 0xffffffff;
8143 erela = reldata->hdr->contents;
8144 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8146 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8149 if (*rel_hash == NULL)
8152 BFD_ASSERT ((*rel_hash)->indx >= 0);
8154 (*swap_in) (abfd, erela, irela);
8155 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8156 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8157 | (irela[j].r_info & r_type_mask));
8158 (*swap_out) (abfd, irela, erela);
8163 int (*compare) (const void *, const void *);
8165 if (bed->s->arch_size == 32)
8167 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8168 compare = cmp_ext32l_r_offset;
8169 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8170 compare = cmp_ext32b_r_offset;
8176 #ifdef BFD_HOST_64_BIT
8177 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8178 compare = cmp_ext64l_r_offset;
8179 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8180 compare = cmp_ext64b_r_offset;
8185 qsort (reldata->hdr->contents, count, reldata->hdr->sh_entsize, compare);
8186 free (reldata->hashes);
8187 reldata->hashes = NULL;
8191 struct elf_link_sort_rela
8197 enum elf_reloc_type_class type;
8198 /* We use this as an array of size int_rels_per_ext_rel. */
8199 Elf_Internal_Rela rela[1];
8203 elf_link_sort_cmp1 (const void *A, const void *B)
8205 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8206 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8207 int relativea, relativeb;
8209 relativea = a->type == reloc_class_relative;
8210 relativeb = b->type == reloc_class_relative;
8212 if (relativea < relativeb)
8214 if (relativea > relativeb)
8216 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8218 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8220 if (a->rela->r_offset < b->rela->r_offset)
8222 if (a->rela->r_offset > b->rela->r_offset)
8228 elf_link_sort_cmp2 (const void *A, const void *B)
8230 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8231 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8233 if (a->type < b->type)
8235 if (a->type > b->type)
8237 if (a->u.offset < b->u.offset)
8239 if (a->u.offset > b->u.offset)
8241 if (a->rela->r_offset < b->rela->r_offset)
8243 if (a->rela->r_offset > b->rela->r_offset)
8249 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8251 asection *dynamic_relocs;
8254 bfd_size_type count, size;
8255 size_t i, ret, sort_elt, ext_size;
8256 bfd_byte *sort, *s_non_relative, *p;
8257 struct elf_link_sort_rela *sq;
8258 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8259 int i2e = bed->s->int_rels_per_ext_rel;
8260 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8261 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8262 struct bfd_link_order *lo;
8264 bfd_boolean use_rela;
8266 /* Find a dynamic reloc section. */
8267 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8268 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8269 if (rela_dyn != NULL && rela_dyn->size > 0
8270 && rel_dyn != NULL && rel_dyn->size > 0)
8272 bfd_boolean use_rela_initialised = FALSE;
8274 /* This is just here to stop gcc from complaining.
8275 It's initialization checking code is not perfect. */
8278 /* Both sections are present. Examine the sizes
8279 of the indirect sections to help us choose. */
8280 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8281 if (lo->type == bfd_indirect_link_order)
8283 asection *o = lo->u.indirect.section;
8285 if ((o->size % bed->s->sizeof_rela) == 0)
8287 if ((o->size % bed->s->sizeof_rel) == 0)
8288 /* Section size is divisible by both rel and rela sizes.
8289 It is of no help to us. */
8293 /* Section size is only divisible by rela. */
8294 if (use_rela_initialised && (use_rela == FALSE))
8297 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8298 bfd_set_error (bfd_error_invalid_operation);
8304 use_rela_initialised = TRUE;
8308 else if ((o->size % bed->s->sizeof_rel) == 0)
8310 /* Section size is only divisible by rel. */
8311 if (use_rela_initialised && (use_rela == TRUE))
8314 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8315 bfd_set_error (bfd_error_invalid_operation);
8321 use_rela_initialised = TRUE;
8326 /* The section size is not divisible by either - something is wrong. */
8328 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8329 bfd_set_error (bfd_error_invalid_operation);
8334 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8335 if (lo->type == bfd_indirect_link_order)
8337 asection *o = lo->u.indirect.section;
8339 if ((o->size % bed->s->sizeof_rela) == 0)
8341 if ((o->size % bed->s->sizeof_rel) == 0)
8342 /* Section size is divisible by both rel and rela sizes.
8343 It is of no help to us. */
8347 /* Section size is only divisible by rela. */
8348 if (use_rela_initialised && (use_rela == FALSE))
8351 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8352 bfd_set_error (bfd_error_invalid_operation);
8358 use_rela_initialised = TRUE;
8362 else if ((o->size % bed->s->sizeof_rel) == 0)
8364 /* Section size is only divisible by rel. */
8365 if (use_rela_initialised && (use_rela == TRUE))
8368 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8369 bfd_set_error (bfd_error_invalid_operation);
8375 use_rela_initialised = TRUE;
8380 /* The section size is not divisible by either - something is wrong. */
8382 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8383 bfd_set_error (bfd_error_invalid_operation);
8388 if (! use_rela_initialised)
8392 else if (rela_dyn != NULL && rela_dyn->size > 0)
8394 else if (rel_dyn != NULL && rel_dyn->size > 0)
8401 dynamic_relocs = rela_dyn;
8402 ext_size = bed->s->sizeof_rela;
8403 swap_in = bed->s->swap_reloca_in;
8404 swap_out = bed->s->swap_reloca_out;
8408 dynamic_relocs = rel_dyn;
8409 ext_size = bed->s->sizeof_rel;
8410 swap_in = bed->s->swap_reloc_in;
8411 swap_out = bed->s->swap_reloc_out;
8415 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8416 if (lo->type == bfd_indirect_link_order)
8417 size += lo->u.indirect.section->size;
8419 if (size != dynamic_relocs->size)
8422 sort_elt = (sizeof (struct elf_link_sort_rela)
8423 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8425 count = dynamic_relocs->size / ext_size;
8428 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8432 (*info->callbacks->warning)
8433 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8437 if (bed->s->arch_size == 32)
8438 r_sym_mask = ~(bfd_vma) 0xff;
8440 r_sym_mask = ~(bfd_vma) 0xffffffff;
8442 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8443 if (lo->type == bfd_indirect_link_order)
8445 bfd_byte *erel, *erelend;
8446 asection *o = lo->u.indirect.section;
8448 if (o->contents == NULL && o->size != 0)
8450 /* This is a reloc section that is being handled as a normal
8451 section. See bfd_section_from_shdr. We can't combine
8452 relocs in this case. */
8457 erelend = o->contents + o->size;
8458 /* FIXME: octets_per_byte. */
8459 p = sort + o->output_offset / ext_size * sort_elt;
8461 while (erel < erelend)
8463 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8465 (*swap_in) (abfd, erel, s->rela);
8466 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8467 s->u.sym_mask = r_sym_mask;
8473 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8475 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8477 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8478 if (s->type != reloc_class_relative)
8484 sq = (struct elf_link_sort_rela *) s_non_relative;
8485 for (; i < count; i++, p += sort_elt)
8487 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8488 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8490 sp->u.offset = sq->rela->r_offset;
8493 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8495 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8496 if (lo->type == bfd_indirect_link_order)
8498 bfd_byte *erel, *erelend;
8499 asection *o = lo->u.indirect.section;
8502 erelend = o->contents + o->size;
8503 /* FIXME: octets_per_byte. */
8504 p = sort + o->output_offset / ext_size * sort_elt;
8505 while (erel < erelend)
8507 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8508 (*swap_out) (abfd, s->rela, erel);
8515 *psec = dynamic_relocs;
8519 /* Flush the output symbols to the file. */
8522 elf_link_flush_output_syms (struct elf_final_link_info *flinfo,
8523 const struct elf_backend_data *bed)
8525 if (flinfo->symbuf_count > 0)
8527 Elf_Internal_Shdr *hdr;
8531 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8532 pos = hdr->sh_offset + hdr->sh_size;
8533 amt = flinfo->symbuf_count * bed->s->sizeof_sym;
8534 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) != 0
8535 || bfd_bwrite (flinfo->symbuf, amt, flinfo->output_bfd) != amt)
8538 hdr->sh_size += amt;
8539 flinfo->symbuf_count = 0;
8545 /* Add a symbol to the output symbol table. */
8548 elf_link_output_sym (struct elf_final_link_info *flinfo,
8550 Elf_Internal_Sym *elfsym,
8551 asection *input_sec,
8552 struct elf_link_hash_entry *h)
8555 Elf_External_Sym_Shndx *destshndx;
8556 int (*output_symbol_hook)
8557 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8558 struct elf_link_hash_entry *);
8559 const struct elf_backend_data *bed;
8561 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8563 bed = get_elf_backend_data (flinfo->output_bfd);
8564 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8565 if (output_symbol_hook != NULL)
8567 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8572 if (name == NULL || *name == '\0')
8573 elfsym->st_name = 0;
8574 else if (input_sec->flags & SEC_EXCLUDE)
8575 elfsym->st_name = 0;
8578 elfsym->st_name = (unsigned long) _bfd_stringtab_add (flinfo->symstrtab,
8580 if (elfsym->st_name == (unsigned long) -1)
8584 if (flinfo->symbuf_count >= flinfo->symbuf_size)
8586 if (! elf_link_flush_output_syms (flinfo, bed))
8590 dest = flinfo->symbuf + flinfo->symbuf_count * bed->s->sizeof_sym;
8591 destshndx = flinfo->symshndxbuf;
8592 if (destshndx != NULL)
8594 if (bfd_get_symcount (flinfo->output_bfd) >= flinfo->shndxbuf_size)
8598 amt = flinfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8599 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8601 if (destshndx == NULL)
8603 flinfo->symshndxbuf = destshndx;
8604 memset ((char *) destshndx + amt, 0, amt);
8605 flinfo->shndxbuf_size *= 2;
8607 destshndx += bfd_get_symcount (flinfo->output_bfd);
8610 bed->s->swap_symbol_out (flinfo->output_bfd, elfsym, dest, destshndx);
8611 flinfo->symbuf_count += 1;
8612 bfd_get_symcount (flinfo->output_bfd) += 1;
8617 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8620 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8622 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8623 && sym->st_shndx < SHN_LORESERVE)
8625 /* The gABI doesn't support dynamic symbols in output sections
8627 (*_bfd_error_handler)
8628 (_("%B: Too many sections: %d (>= %d)"),
8629 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8630 bfd_set_error (bfd_error_nonrepresentable_section);
8636 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8637 allowing an unsatisfied unversioned symbol in the DSO to match a
8638 versioned symbol that would normally require an explicit version.
8639 We also handle the case that a DSO references a hidden symbol
8640 which may be satisfied by a versioned symbol in another DSO. */
8643 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8644 const struct elf_backend_data *bed,
8645 struct elf_link_hash_entry *h)
8648 struct elf_link_loaded_list *loaded;
8650 if (!is_elf_hash_table (info->hash))
8653 /* Check indirect symbol. */
8654 while (h->root.type == bfd_link_hash_indirect)
8655 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8657 switch (h->root.type)
8663 case bfd_link_hash_undefined:
8664 case bfd_link_hash_undefweak:
8665 abfd = h->root.u.undef.abfd;
8666 if ((abfd->flags & DYNAMIC) == 0
8667 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8671 case bfd_link_hash_defined:
8672 case bfd_link_hash_defweak:
8673 abfd = h->root.u.def.section->owner;
8676 case bfd_link_hash_common:
8677 abfd = h->root.u.c.p->section->owner;
8680 BFD_ASSERT (abfd != NULL);
8682 for (loaded = elf_hash_table (info)->loaded;
8684 loaded = loaded->next)
8687 Elf_Internal_Shdr *hdr;
8688 bfd_size_type symcount;
8689 bfd_size_type extsymcount;
8690 bfd_size_type extsymoff;
8691 Elf_Internal_Shdr *versymhdr;
8692 Elf_Internal_Sym *isym;
8693 Elf_Internal_Sym *isymend;
8694 Elf_Internal_Sym *isymbuf;
8695 Elf_External_Versym *ever;
8696 Elf_External_Versym *extversym;
8698 input = loaded->abfd;
8700 /* We check each DSO for a possible hidden versioned definition. */
8702 || (input->flags & DYNAMIC) == 0
8703 || elf_dynversym (input) == 0)
8706 hdr = &elf_tdata (input)->dynsymtab_hdr;
8708 symcount = hdr->sh_size / bed->s->sizeof_sym;
8709 if (elf_bad_symtab (input))
8711 extsymcount = symcount;
8716 extsymcount = symcount - hdr->sh_info;
8717 extsymoff = hdr->sh_info;
8720 if (extsymcount == 0)
8723 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8725 if (isymbuf == NULL)
8728 /* Read in any version definitions. */
8729 versymhdr = &elf_tdata (input)->dynversym_hdr;
8730 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8731 if (extversym == NULL)
8734 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8735 || (bfd_bread (extversym, versymhdr->sh_size, input)
8736 != versymhdr->sh_size))
8744 ever = extversym + extsymoff;
8745 isymend = isymbuf + extsymcount;
8746 for (isym = isymbuf; isym < isymend; isym++, ever++)
8749 Elf_Internal_Versym iver;
8750 unsigned short version_index;
8752 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8753 || isym->st_shndx == SHN_UNDEF)
8756 name = bfd_elf_string_from_elf_section (input,
8759 if (strcmp (name, h->root.root.string) != 0)
8762 _bfd_elf_swap_versym_in (input, ever, &iver);
8764 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8766 && h->forced_local))
8768 /* If we have a non-hidden versioned sym, then it should
8769 have provided a definition for the undefined sym unless
8770 it is defined in a non-shared object and forced local.
8775 version_index = iver.vs_vers & VERSYM_VERSION;
8776 if (version_index == 1 || version_index == 2)
8778 /* This is the base or first version. We can use it. */
8792 /* Add an external symbol to the symbol table. This is called from
8793 the hash table traversal routine. When generating a shared object,
8794 we go through the symbol table twice. The first time we output
8795 anything that might have been forced to local scope in a version
8796 script. The second time we output the symbols that are still
8800 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
8802 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
8803 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8804 struct elf_final_link_info *flinfo = eoinfo->flinfo;
8806 Elf_Internal_Sym sym;
8807 asection *input_sec;
8808 const struct elf_backend_data *bed;
8812 if (h->root.type == bfd_link_hash_warning)
8814 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8815 if (h->root.type == bfd_link_hash_new)
8819 /* Decide whether to output this symbol in this pass. */
8820 if (eoinfo->localsyms)
8822 if (!h->forced_local)
8824 if (eoinfo->second_pass
8825 && !((h->root.type == bfd_link_hash_defined
8826 || h->root.type == bfd_link_hash_defweak)
8827 && h->root.u.def.section->output_section != NULL))
8830 if (!eoinfo->file_sym_done
8831 && (eoinfo->second_pass ? eoinfo->flinfo->filesym_count == 1
8832 : eoinfo->flinfo->filesym_count > 1))
8834 /* Output a FILE symbol so that following locals are not associated
8835 with the wrong input file. */
8836 memset (&sym, 0, sizeof (sym));
8837 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
8838 sym.st_shndx = SHN_ABS;
8839 if (!elf_link_output_sym (eoinfo->flinfo, NULL, &sym,
8840 bfd_und_section_ptr, NULL))
8843 eoinfo->file_sym_done = TRUE;
8848 if (h->forced_local)
8852 bed = get_elf_backend_data (flinfo->output_bfd);
8854 if (h->root.type == bfd_link_hash_undefined)
8856 /* If we have an undefined symbol reference here then it must have
8857 come from a shared library that is being linked in. (Undefined
8858 references in regular files have already been handled unless
8859 they are in unreferenced sections which are removed by garbage
8861 bfd_boolean ignore_undef = FALSE;
8863 /* Some symbols may be special in that the fact that they're
8864 undefined can be safely ignored - let backend determine that. */
8865 if (bed->elf_backend_ignore_undef_symbol)
8866 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8868 /* If we are reporting errors for this situation then do so now. */
8871 && (!h->ref_regular || flinfo->info->gc_sections)
8872 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
8873 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8875 if (!(flinfo->info->callbacks->undefined_symbol
8876 (flinfo->info, h->root.root.string,
8877 h->ref_regular ? NULL : h->root.u.undef.abfd,
8879 (flinfo->info->unresolved_syms_in_shared_libs
8880 == RM_GENERATE_ERROR))))
8882 bfd_set_error (bfd_error_bad_value);
8883 eoinfo->failed = TRUE;
8889 /* We should also warn if a forced local symbol is referenced from
8890 shared libraries. */
8891 if (!flinfo->info->relocatable
8892 && flinfo->info->executable
8897 && h->ref_dynamic_nonweak
8898 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
8902 struct elf_link_hash_entry *hi = h;
8904 /* Check indirect symbol. */
8905 while (hi->root.type == bfd_link_hash_indirect)
8906 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
8908 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
8909 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
8910 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
8911 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
8913 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
8914 def_bfd = flinfo->output_bfd;
8915 if (hi->root.u.def.section != bfd_abs_section_ptr)
8916 def_bfd = hi->root.u.def.section->owner;
8917 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
8918 h->root.root.string);
8919 bfd_set_error (bfd_error_bad_value);
8920 eoinfo->failed = TRUE;
8924 /* We don't want to output symbols that have never been mentioned by
8925 a regular file, or that we have been told to strip. However, if
8926 h->indx is set to -2, the symbol is used by a reloc and we must
8930 else if ((h->def_dynamic
8932 || h->root.type == bfd_link_hash_new)
8936 else if (flinfo->info->strip == strip_all)
8938 else if (flinfo->info->strip == strip_some
8939 && bfd_hash_lookup (flinfo->info->keep_hash,
8940 h->root.root.string, FALSE, FALSE) == NULL)
8942 else if ((h->root.type == bfd_link_hash_defined
8943 || h->root.type == bfd_link_hash_defweak)
8944 && ((flinfo->info->strip_discarded
8945 && discarded_section (h->root.u.def.section))
8946 || (h->root.u.def.section->owner != NULL
8947 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
8949 else if ((h->root.type == bfd_link_hash_undefined
8950 || h->root.type == bfd_link_hash_undefweak)
8951 && h->root.u.undef.abfd != NULL
8952 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
8957 /* If we're stripping it, and it's not a dynamic symbol, there's
8958 nothing else to do unless it is a forced local symbol or a
8959 STT_GNU_IFUNC symbol. */
8962 && h->type != STT_GNU_IFUNC
8963 && !h->forced_local)
8967 sym.st_size = h->size;
8968 sym.st_other = h->other;
8969 if (h->forced_local)
8971 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8972 /* Turn off visibility on local symbol. */
8973 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8975 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
8976 else if (h->unique_global && h->def_regular)
8977 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8978 else if (h->root.type == bfd_link_hash_undefweak
8979 || h->root.type == bfd_link_hash_defweak)
8980 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8982 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8983 sym.st_target_internal = h->target_internal;
8985 switch (h->root.type)
8988 case bfd_link_hash_new:
8989 case bfd_link_hash_warning:
8993 case bfd_link_hash_undefined:
8994 case bfd_link_hash_undefweak:
8995 input_sec = bfd_und_section_ptr;
8996 sym.st_shndx = SHN_UNDEF;
8999 case bfd_link_hash_defined:
9000 case bfd_link_hash_defweak:
9002 input_sec = h->root.u.def.section;
9003 if (input_sec->output_section != NULL)
9005 if (eoinfo->localsyms && flinfo->filesym_count == 1)
9007 bfd_boolean second_pass_sym
9008 = (input_sec->owner == flinfo->output_bfd
9009 || input_sec->owner == NULL
9010 || (input_sec->flags & SEC_LINKER_CREATED) != 0
9011 || (input_sec->owner->flags & BFD_LINKER_CREATED) != 0);
9013 eoinfo->need_second_pass |= second_pass_sym;
9014 if (eoinfo->second_pass != second_pass_sym)
9019 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
9020 input_sec->output_section);
9021 if (sym.st_shndx == SHN_BAD)
9023 (*_bfd_error_handler)
9024 (_("%B: could not find output section %A for input section %A"),
9025 flinfo->output_bfd, input_sec->output_section, input_sec);
9026 bfd_set_error (bfd_error_nonrepresentable_section);
9027 eoinfo->failed = TRUE;
9031 /* ELF symbols in relocatable files are section relative,
9032 but in nonrelocatable files they are virtual
9034 sym.st_value = h->root.u.def.value + input_sec->output_offset;
9035 if (!flinfo->info->relocatable)
9037 sym.st_value += input_sec->output_section->vma;
9038 if (h->type == STT_TLS)
9040 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
9041 if (tls_sec != NULL)
9042 sym.st_value -= tls_sec->vma;
9048 BFD_ASSERT (input_sec->owner == NULL
9049 || (input_sec->owner->flags & DYNAMIC) != 0);
9050 sym.st_shndx = SHN_UNDEF;
9051 input_sec = bfd_und_section_ptr;
9056 case bfd_link_hash_common:
9057 input_sec = h->root.u.c.p->section;
9058 sym.st_shndx = bed->common_section_index (input_sec);
9059 sym.st_value = 1 << h->root.u.c.p->alignment_power;
9062 case bfd_link_hash_indirect:
9063 /* These symbols are created by symbol versioning. They point
9064 to the decorated version of the name. For example, if the
9065 symbol foo@@GNU_1.2 is the default, which should be used when
9066 foo is used with no version, then we add an indirect symbol
9067 foo which points to foo@@GNU_1.2. We ignore these symbols,
9068 since the indirected symbol is already in the hash table. */
9072 /* Give the processor backend a chance to tweak the symbol value,
9073 and also to finish up anything that needs to be done for this
9074 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
9075 forced local syms when non-shared is due to a historical quirk.
9076 STT_GNU_IFUNC symbol must go through PLT. */
9077 if ((h->type == STT_GNU_IFUNC
9079 && !flinfo->info->relocatable)
9080 || ((h->dynindx != -1
9082 && ((flinfo->info->shared
9083 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
9084 || h->root.type != bfd_link_hash_undefweak))
9085 || !h->forced_local)
9086 && elf_hash_table (flinfo->info)->dynamic_sections_created))
9088 if (! ((*bed->elf_backend_finish_dynamic_symbol)
9089 (flinfo->output_bfd, flinfo->info, h, &sym)))
9091 eoinfo->failed = TRUE;
9096 /* If we are marking the symbol as undefined, and there are no
9097 non-weak references to this symbol from a regular object, then
9098 mark the symbol as weak undefined; if there are non-weak
9099 references, mark the symbol as strong. We can't do this earlier,
9100 because it might not be marked as undefined until the
9101 finish_dynamic_symbol routine gets through with it. */
9102 if (sym.st_shndx == SHN_UNDEF
9104 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
9105 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
9108 unsigned int type = ELF_ST_TYPE (sym.st_info);
9110 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
9111 if (type == STT_GNU_IFUNC)
9114 if (h->ref_regular_nonweak)
9115 bindtype = STB_GLOBAL;
9117 bindtype = STB_WEAK;
9118 sym.st_info = ELF_ST_INFO (bindtype, type);
9121 /* If this is a symbol defined in a dynamic library, don't use the
9122 symbol size from the dynamic library. Relinking an executable
9123 against a new library may introduce gratuitous changes in the
9124 executable's symbols if we keep the size. */
9125 if (sym.st_shndx == SHN_UNDEF
9130 /* If a non-weak symbol with non-default visibility is not defined
9131 locally, it is a fatal error. */
9132 if (!flinfo->info->relocatable
9133 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
9134 && ELF_ST_BIND (sym.st_info) != STB_WEAK
9135 && h->root.type == bfd_link_hash_undefined
9140 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
9141 msg = _("%B: protected symbol `%s' isn't defined");
9142 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
9143 msg = _("%B: internal symbol `%s' isn't defined");
9145 msg = _("%B: hidden symbol `%s' isn't defined");
9146 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
9147 bfd_set_error (bfd_error_bad_value);
9148 eoinfo->failed = TRUE;
9152 /* If this symbol should be put in the .dynsym section, then put it
9153 there now. We already know the symbol index. We also fill in
9154 the entry in the .hash section. */
9155 if (flinfo->dynsym_sec != NULL
9157 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9161 /* Since there is no version information in the dynamic string,
9162 if there is no version info in symbol version section, we will
9163 have a run-time problem. */
9164 if (h->verinfo.verdef == NULL)
9166 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9168 if (p && p [1] != '\0')
9170 (*_bfd_error_handler)
9171 (_("%B: No symbol version section for versioned symbol `%s'"),
9172 flinfo->output_bfd, h->root.root.string);
9173 eoinfo->failed = TRUE;
9178 sym.st_name = h->dynstr_index;
9179 esym = flinfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
9180 if (!check_dynsym (flinfo->output_bfd, &sym))
9182 eoinfo->failed = TRUE;
9185 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9187 if (flinfo->hash_sec != NULL)
9189 size_t hash_entry_size;
9190 bfd_byte *bucketpos;
9195 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9196 bucket = h->u.elf_hash_value % bucketcount;
9199 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9200 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9201 + (bucket + 2) * hash_entry_size);
9202 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9203 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9205 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9206 ((bfd_byte *) flinfo->hash_sec->contents
9207 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9210 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9212 Elf_Internal_Versym iversym;
9213 Elf_External_Versym *eversym;
9215 if (!h->def_regular)
9217 if (h->verinfo.verdef == NULL
9218 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
9219 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
9220 iversym.vs_vers = 0;
9222 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9226 if (h->verinfo.vertree == NULL)
9227 iversym.vs_vers = 1;
9229 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9230 if (flinfo->info->create_default_symver)
9235 iversym.vs_vers |= VERSYM_HIDDEN;
9237 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9238 eversym += h->dynindx;
9239 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9243 /* If we're stripping it, then it was just a dynamic symbol, and
9244 there's nothing else to do. */
9245 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
9248 indx = bfd_get_symcount (flinfo->output_bfd);
9249 ret = elf_link_output_sym (flinfo, h->root.root.string, &sym, input_sec, h);
9252 eoinfo->failed = TRUE;
9257 else if (h->indx == -2)
9263 /* Return TRUE if special handling is done for relocs in SEC against
9264 symbols defined in discarded sections. */
9267 elf_section_ignore_discarded_relocs (asection *sec)
9269 const struct elf_backend_data *bed;
9271 switch (sec->sec_info_type)
9273 case SEC_INFO_TYPE_STABS:
9274 case SEC_INFO_TYPE_EH_FRAME:
9280 bed = get_elf_backend_data (sec->owner);
9281 if (bed->elf_backend_ignore_discarded_relocs != NULL
9282 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9288 /* Return a mask saying how ld should treat relocations in SEC against
9289 symbols defined in discarded sections. If this function returns
9290 COMPLAIN set, ld will issue a warning message. If this function
9291 returns PRETEND set, and the discarded section was link-once and the
9292 same size as the kept link-once section, ld will pretend that the
9293 symbol was actually defined in the kept section. Otherwise ld will
9294 zero the reloc (at least that is the intent, but some cooperation by
9295 the target dependent code is needed, particularly for REL targets). */
9298 _bfd_elf_default_action_discarded (asection *sec)
9300 if (sec->flags & SEC_DEBUGGING)
9303 if (strcmp (".eh_frame", sec->name) == 0)
9306 if (strcmp (".gcc_except_table", sec->name) == 0)
9309 return COMPLAIN | PRETEND;
9312 /* Find a match between a section and a member of a section group. */
9315 match_group_member (asection *sec, asection *group,
9316 struct bfd_link_info *info)
9318 asection *first = elf_next_in_group (group);
9319 asection *s = first;
9323 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9326 s = elf_next_in_group (s);
9334 /* Check if the kept section of a discarded section SEC can be used
9335 to replace it. Return the replacement if it is OK. Otherwise return
9339 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9343 kept = sec->kept_section;
9346 if ((kept->flags & SEC_GROUP) != 0)
9347 kept = match_group_member (sec, kept, info);
9349 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9350 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9352 sec->kept_section = kept;
9357 /* Link an input file into the linker output file. This function
9358 handles all the sections and relocations of the input file at once.
9359 This is so that we only have to read the local symbols once, and
9360 don't have to keep them in memory. */
9363 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9365 int (*relocate_section)
9366 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9367 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9369 Elf_Internal_Shdr *symtab_hdr;
9372 Elf_Internal_Sym *isymbuf;
9373 Elf_Internal_Sym *isym;
9374 Elf_Internal_Sym *isymend;
9376 asection **ppsection;
9378 const struct elf_backend_data *bed;
9379 struct elf_link_hash_entry **sym_hashes;
9380 bfd_size_type address_size;
9381 bfd_vma r_type_mask;
9383 bfd_boolean have_file_sym = FALSE;
9385 output_bfd = flinfo->output_bfd;
9386 bed = get_elf_backend_data (output_bfd);
9387 relocate_section = bed->elf_backend_relocate_section;
9389 /* If this is a dynamic object, we don't want to do anything here:
9390 we don't want the local symbols, and we don't want the section
9392 if ((input_bfd->flags & DYNAMIC) != 0)
9395 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9396 if (elf_bad_symtab (input_bfd))
9398 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9403 locsymcount = symtab_hdr->sh_info;
9404 extsymoff = symtab_hdr->sh_info;
9407 /* Read the local symbols. */
9408 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9409 if (isymbuf == NULL && locsymcount != 0)
9411 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9412 flinfo->internal_syms,
9413 flinfo->external_syms,
9414 flinfo->locsym_shndx);
9415 if (isymbuf == NULL)
9419 /* Find local symbol sections and adjust values of symbols in
9420 SEC_MERGE sections. Write out those local symbols we know are
9421 going into the output file. */
9422 isymend = isymbuf + locsymcount;
9423 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9425 isym++, pindex++, ppsection++)
9429 Elf_Internal_Sym osym;
9435 if (elf_bad_symtab (input_bfd))
9437 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9444 if (isym->st_shndx == SHN_UNDEF)
9445 isec = bfd_und_section_ptr;
9446 else if (isym->st_shndx == SHN_ABS)
9447 isec = bfd_abs_section_ptr;
9448 else if (isym->st_shndx == SHN_COMMON)
9449 isec = bfd_com_section_ptr;
9452 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9455 /* Don't attempt to output symbols with st_shnx in the
9456 reserved range other than SHN_ABS and SHN_COMMON. */
9460 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9461 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9463 _bfd_merged_section_offset (output_bfd, &isec,
9464 elf_section_data (isec)->sec_info,
9470 /* Don't output the first, undefined, symbol. */
9471 if (ppsection == flinfo->sections)
9474 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9476 /* We never output section symbols. Instead, we use the
9477 section symbol of the corresponding section in the output
9482 /* If we are stripping all symbols, we don't want to output this
9484 if (flinfo->info->strip == strip_all)
9487 /* If we are discarding all local symbols, we don't want to
9488 output this one. If we are generating a relocatable output
9489 file, then some of the local symbols may be required by
9490 relocs; we output them below as we discover that they are
9492 if (flinfo->info->discard == discard_all)
9495 /* If this symbol is defined in a section which we are
9496 discarding, we don't need to keep it. */
9497 if (isym->st_shndx != SHN_UNDEF
9498 && isym->st_shndx < SHN_LORESERVE
9499 && bfd_section_removed_from_list (output_bfd,
9500 isec->output_section))
9503 /* Get the name of the symbol. */
9504 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9509 /* See if we are discarding symbols with this name. */
9510 if ((flinfo->info->strip == strip_some
9511 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9513 || (((flinfo->info->discard == discard_sec_merge
9514 && (isec->flags & SEC_MERGE) && !flinfo->info->relocatable)
9515 || flinfo->info->discard == discard_l)
9516 && bfd_is_local_label_name (input_bfd, name)))
9519 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9521 have_file_sym = TRUE;
9522 flinfo->filesym_count += 1;
9526 /* In the absence of debug info, bfd_find_nearest_line uses
9527 FILE symbols to determine the source file for local
9528 function symbols. Provide a FILE symbol here if input
9529 files lack such, so that their symbols won't be
9530 associated with a previous input file. It's not the
9531 source file, but the best we can do. */
9532 have_file_sym = TRUE;
9533 flinfo->filesym_count += 1;
9534 memset (&osym, 0, sizeof (osym));
9535 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9536 osym.st_shndx = SHN_ABS;
9537 if (!elf_link_output_sym (flinfo, input_bfd->filename, &osym,
9538 bfd_abs_section_ptr, NULL))
9544 /* Adjust the section index for the output file. */
9545 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9546 isec->output_section);
9547 if (osym.st_shndx == SHN_BAD)
9550 /* ELF symbols in relocatable files are section relative, but
9551 in executable files they are virtual addresses. Note that
9552 this code assumes that all ELF sections have an associated
9553 BFD section with a reasonable value for output_offset; below
9554 we assume that they also have a reasonable value for
9555 output_section. Any special sections must be set up to meet
9556 these requirements. */
9557 osym.st_value += isec->output_offset;
9558 if (!flinfo->info->relocatable)
9560 osym.st_value += isec->output_section->vma;
9561 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9563 /* STT_TLS symbols are relative to PT_TLS segment base. */
9564 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9565 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9569 indx = bfd_get_symcount (output_bfd);
9570 ret = elf_link_output_sym (flinfo, name, &osym, isec, NULL);
9577 if (bed->s->arch_size == 32)
9585 r_type_mask = 0xffffffff;
9590 /* Relocate the contents of each section. */
9591 sym_hashes = elf_sym_hashes (input_bfd);
9592 for (o = input_bfd->sections; o != NULL; o = o->next)
9596 if (! o->linker_mark)
9598 /* This section was omitted from the link. */
9602 if (flinfo->info->relocatable
9603 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9605 /* Deal with the group signature symbol. */
9606 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9607 unsigned long symndx = sec_data->this_hdr.sh_info;
9608 asection *osec = o->output_section;
9610 if (symndx >= locsymcount
9611 || (elf_bad_symtab (input_bfd)
9612 && flinfo->sections[symndx] == NULL))
9614 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9615 while (h->root.type == bfd_link_hash_indirect
9616 || h->root.type == bfd_link_hash_warning)
9617 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9618 /* Arrange for symbol to be output. */
9620 elf_section_data (osec)->this_hdr.sh_info = -2;
9622 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9624 /* We'll use the output section target_index. */
9625 asection *sec = flinfo->sections[symndx]->output_section;
9626 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9630 if (flinfo->indices[symndx] == -1)
9632 /* Otherwise output the local symbol now. */
9633 Elf_Internal_Sym sym = isymbuf[symndx];
9634 asection *sec = flinfo->sections[symndx]->output_section;
9639 name = bfd_elf_string_from_elf_section (input_bfd,
9640 symtab_hdr->sh_link,
9645 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9647 if (sym.st_shndx == SHN_BAD)
9650 sym.st_value += o->output_offset;
9652 indx = bfd_get_symcount (output_bfd);
9653 ret = elf_link_output_sym (flinfo, name, &sym, o, NULL);
9657 flinfo->indices[symndx] = indx;
9661 elf_section_data (osec)->this_hdr.sh_info
9662 = flinfo->indices[symndx];
9666 if ((o->flags & SEC_HAS_CONTENTS) == 0
9667 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9670 if ((o->flags & SEC_LINKER_CREATED) != 0)
9672 /* Section was created by _bfd_elf_link_create_dynamic_sections
9677 /* Get the contents of the section. They have been cached by a
9678 relaxation routine. Note that o is a section in an input
9679 file, so the contents field will not have been set by any of
9680 the routines which work on output files. */
9681 if (elf_section_data (o)->this_hdr.contents != NULL)
9683 contents = elf_section_data (o)->this_hdr.contents;
9684 if (bed->caches_rawsize
9686 && o->rawsize < o->size)
9688 memcpy (flinfo->contents, contents, o->rawsize);
9689 contents = flinfo->contents;
9694 contents = flinfo->contents;
9695 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9699 if ((o->flags & SEC_RELOC) != 0)
9701 Elf_Internal_Rela *internal_relocs;
9702 Elf_Internal_Rela *rel, *relend;
9703 int action_discarded;
9706 /* Get the swapped relocs. */
9708 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
9709 flinfo->internal_relocs, FALSE);
9710 if (internal_relocs == NULL
9711 && o->reloc_count > 0)
9714 /* We need to reverse-copy input .ctors/.dtors sections if
9715 they are placed in .init_array/.finit_array for output. */
9716 if (o->size > address_size
9717 && ((strncmp (o->name, ".ctors", 6) == 0
9718 && strcmp (o->output_section->name,
9719 ".init_array") == 0)
9720 || (strncmp (o->name, ".dtors", 6) == 0
9721 && strcmp (o->output_section->name,
9722 ".fini_array") == 0))
9723 && (o->name[6] == 0 || o->name[6] == '.'))
9725 if (o->size != o->reloc_count * address_size)
9727 (*_bfd_error_handler)
9728 (_("error: %B: size of section %A is not "
9729 "multiple of address size"),
9731 bfd_set_error (bfd_error_on_input);
9734 o->flags |= SEC_ELF_REVERSE_COPY;
9737 action_discarded = -1;
9738 if (!elf_section_ignore_discarded_relocs (o))
9739 action_discarded = (*bed->action_discarded) (o);
9741 /* Run through the relocs evaluating complex reloc symbols and
9742 looking for relocs against symbols from discarded sections
9743 or section symbols from removed link-once sections.
9744 Complain about relocs against discarded sections. Zero
9745 relocs against removed link-once sections. */
9747 rel = internal_relocs;
9748 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9749 for ( ; rel < relend; rel++)
9751 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9752 unsigned int s_type;
9753 asection **ps, *sec;
9754 struct elf_link_hash_entry *h = NULL;
9755 const char *sym_name;
9757 if (r_symndx == STN_UNDEF)
9760 if (r_symndx >= locsymcount
9761 || (elf_bad_symtab (input_bfd)
9762 && flinfo->sections[r_symndx] == NULL))
9764 h = sym_hashes[r_symndx - extsymoff];
9766 /* Badly formatted input files can contain relocs that
9767 reference non-existant symbols. Check here so that
9768 we do not seg fault. */
9773 sprintf_vma (buffer, rel->r_info);
9774 (*_bfd_error_handler)
9775 (_("error: %B contains a reloc (0x%s) for section %A "
9776 "that references a non-existent global symbol"),
9777 input_bfd, o, buffer);
9778 bfd_set_error (bfd_error_bad_value);
9782 while (h->root.type == bfd_link_hash_indirect
9783 || h->root.type == bfd_link_hash_warning)
9784 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9789 if (h->root.type == bfd_link_hash_defined
9790 || h->root.type == bfd_link_hash_defweak)
9791 ps = &h->root.u.def.section;
9793 sym_name = h->root.root.string;
9797 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9799 s_type = ELF_ST_TYPE (sym->st_info);
9800 ps = &flinfo->sections[r_symndx];
9801 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9805 if ((s_type == STT_RELC || s_type == STT_SRELC)
9806 && !flinfo->info->relocatable)
9809 bfd_vma dot = (rel->r_offset
9810 + o->output_offset + o->output_section->vma);
9812 printf ("Encountered a complex symbol!");
9813 printf (" (input_bfd %s, section %s, reloc %ld\n",
9814 input_bfd->filename, o->name,
9815 (long) (rel - internal_relocs));
9816 printf (" symbol: idx %8.8lx, name %s\n",
9817 r_symndx, sym_name);
9818 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9819 (unsigned long) rel->r_info,
9820 (unsigned long) rel->r_offset);
9822 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
9823 isymbuf, locsymcount, s_type == STT_SRELC))
9826 /* Symbol evaluated OK. Update to absolute value. */
9827 set_symbol_value (input_bfd, isymbuf, locsymcount,
9832 if (action_discarded != -1 && ps != NULL)
9834 /* Complain if the definition comes from a
9835 discarded section. */
9836 if ((sec = *ps) != NULL && discarded_section (sec))
9838 BFD_ASSERT (r_symndx != STN_UNDEF);
9839 if (action_discarded & COMPLAIN)
9840 (*flinfo->info->callbacks->einfo)
9841 (_("%X`%s' referenced in section `%A' of %B: "
9842 "defined in discarded section `%A' of %B\n"),
9843 sym_name, o, input_bfd, sec, sec->owner);
9845 /* Try to do the best we can to support buggy old
9846 versions of gcc. Pretend that the symbol is
9847 really defined in the kept linkonce section.
9848 FIXME: This is quite broken. Modifying the
9849 symbol here means we will be changing all later
9850 uses of the symbol, not just in this section. */
9851 if (action_discarded & PRETEND)
9855 kept = _bfd_elf_check_kept_section (sec,
9867 /* Relocate the section by invoking a back end routine.
9869 The back end routine is responsible for adjusting the
9870 section contents as necessary, and (if using Rela relocs
9871 and generating a relocatable output file) adjusting the
9872 reloc addend as necessary.
9874 The back end routine does not have to worry about setting
9875 the reloc address or the reloc symbol index.
9877 The back end routine is given a pointer to the swapped in
9878 internal symbols, and can access the hash table entries
9879 for the external symbols via elf_sym_hashes (input_bfd).
9881 When generating relocatable output, the back end routine
9882 must handle STB_LOCAL/STT_SECTION symbols specially. The
9883 output symbol is going to be a section symbol
9884 corresponding to the output section, which will require
9885 the addend to be adjusted. */
9887 ret = (*relocate_section) (output_bfd, flinfo->info,
9888 input_bfd, o, contents,
9896 || flinfo->info->relocatable
9897 || flinfo->info->emitrelocations)
9899 Elf_Internal_Rela *irela;
9900 Elf_Internal_Rela *irelaend, *irelamid;
9901 bfd_vma last_offset;
9902 struct elf_link_hash_entry **rel_hash;
9903 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
9904 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
9905 unsigned int next_erel;
9906 bfd_boolean rela_normal;
9907 struct bfd_elf_section_data *esdi, *esdo;
9909 esdi = elf_section_data (o);
9910 esdo = elf_section_data (o->output_section);
9911 rela_normal = FALSE;
9913 /* Adjust the reloc addresses and symbol indices. */
9915 irela = internal_relocs;
9916 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9917 rel_hash = esdo->rel.hashes + esdo->rel.count;
9918 /* We start processing the REL relocs, if any. When we reach
9919 IRELAMID in the loop, we switch to the RELA relocs. */
9921 if (esdi->rel.hdr != NULL)
9922 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
9923 * bed->s->int_rels_per_ext_rel);
9924 rel_hash_list = rel_hash;
9925 rela_hash_list = NULL;
9926 last_offset = o->output_offset;
9927 if (!flinfo->info->relocatable)
9928 last_offset += o->output_section->vma;
9929 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9931 unsigned long r_symndx;
9933 Elf_Internal_Sym sym;
9935 if (next_erel == bed->s->int_rels_per_ext_rel)
9941 if (irela == irelamid)
9943 rel_hash = esdo->rela.hashes + esdo->rela.count;
9944 rela_hash_list = rel_hash;
9945 rela_normal = bed->rela_normal;
9948 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9951 if (irela->r_offset >= (bfd_vma) -2)
9953 /* This is a reloc for a deleted entry or somesuch.
9954 Turn it into an R_*_NONE reloc, at the same
9955 offset as the last reloc. elf_eh_frame.c and
9956 bfd_elf_discard_info rely on reloc offsets
9958 irela->r_offset = last_offset;
9960 irela->r_addend = 0;
9964 irela->r_offset += o->output_offset;
9966 /* Relocs in an executable have to be virtual addresses. */
9967 if (!flinfo->info->relocatable)
9968 irela->r_offset += o->output_section->vma;
9970 last_offset = irela->r_offset;
9972 r_symndx = irela->r_info >> r_sym_shift;
9973 if (r_symndx == STN_UNDEF)
9976 if (r_symndx >= locsymcount
9977 || (elf_bad_symtab (input_bfd)
9978 && flinfo->sections[r_symndx] == NULL))
9980 struct elf_link_hash_entry *rh;
9983 /* This is a reloc against a global symbol. We
9984 have not yet output all the local symbols, so
9985 we do not know the symbol index of any global
9986 symbol. We set the rel_hash entry for this
9987 reloc to point to the global hash table entry
9988 for this symbol. The symbol index is then
9989 set at the end of bfd_elf_final_link. */
9990 indx = r_symndx - extsymoff;
9991 rh = elf_sym_hashes (input_bfd)[indx];
9992 while (rh->root.type == bfd_link_hash_indirect
9993 || rh->root.type == bfd_link_hash_warning)
9994 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
9996 /* Setting the index to -2 tells
9997 elf_link_output_extsym that this symbol is
9999 BFD_ASSERT (rh->indx < 0);
10007 /* This is a reloc against a local symbol. */
10010 sym = isymbuf[r_symndx];
10011 sec = flinfo->sections[r_symndx];
10012 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
10014 /* I suppose the backend ought to fill in the
10015 section of any STT_SECTION symbol against a
10016 processor specific section. */
10017 r_symndx = STN_UNDEF;
10018 if (bfd_is_abs_section (sec))
10020 else if (sec == NULL || sec->owner == NULL)
10022 bfd_set_error (bfd_error_bad_value);
10027 asection *osec = sec->output_section;
10029 /* If we have discarded a section, the output
10030 section will be the absolute section. In
10031 case of discarded SEC_MERGE sections, use
10032 the kept section. relocate_section should
10033 have already handled discarded linkonce
10035 if (bfd_is_abs_section (osec)
10036 && sec->kept_section != NULL
10037 && sec->kept_section->output_section != NULL)
10039 osec = sec->kept_section->output_section;
10040 irela->r_addend -= osec->vma;
10043 if (!bfd_is_abs_section (osec))
10045 r_symndx = osec->target_index;
10046 if (r_symndx == STN_UNDEF)
10048 irela->r_addend += osec->vma;
10049 osec = _bfd_nearby_section (output_bfd, osec,
10051 irela->r_addend -= osec->vma;
10052 r_symndx = osec->target_index;
10057 /* Adjust the addend according to where the
10058 section winds up in the output section. */
10060 irela->r_addend += sec->output_offset;
10064 if (flinfo->indices[r_symndx] == -1)
10066 unsigned long shlink;
10071 if (flinfo->info->strip == strip_all)
10073 /* You can't do ld -r -s. */
10074 bfd_set_error (bfd_error_invalid_operation);
10078 /* This symbol was skipped earlier, but
10079 since it is needed by a reloc, we
10080 must output it now. */
10081 shlink = symtab_hdr->sh_link;
10082 name = (bfd_elf_string_from_elf_section
10083 (input_bfd, shlink, sym.st_name));
10087 osec = sec->output_section;
10089 _bfd_elf_section_from_bfd_section (output_bfd,
10091 if (sym.st_shndx == SHN_BAD)
10094 sym.st_value += sec->output_offset;
10095 if (!flinfo->info->relocatable)
10097 sym.st_value += osec->vma;
10098 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
10100 /* STT_TLS symbols are relative to PT_TLS
10102 BFD_ASSERT (elf_hash_table (flinfo->info)
10103 ->tls_sec != NULL);
10104 sym.st_value -= (elf_hash_table (flinfo->info)
10109 indx = bfd_get_symcount (output_bfd);
10110 ret = elf_link_output_sym (flinfo, name, &sym, sec,
10115 flinfo->indices[r_symndx] = indx;
10120 r_symndx = flinfo->indices[r_symndx];
10123 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
10124 | (irela->r_info & r_type_mask));
10127 /* Swap out the relocs. */
10128 input_rel_hdr = esdi->rel.hdr;
10129 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
10131 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10136 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
10137 * bed->s->int_rels_per_ext_rel);
10138 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
10141 input_rela_hdr = esdi->rela.hdr;
10142 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
10144 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10153 /* Write out the modified section contents. */
10154 if (bed->elf_backend_write_section
10155 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
10158 /* Section written out. */
10160 else switch (o->sec_info_type)
10162 case SEC_INFO_TYPE_STABS:
10163 if (! (_bfd_write_section_stabs
10165 &elf_hash_table (flinfo->info)->stab_info,
10166 o, &elf_section_data (o)->sec_info, contents)))
10169 case SEC_INFO_TYPE_MERGE:
10170 if (! _bfd_write_merged_section (output_bfd, o,
10171 elf_section_data (o)->sec_info))
10174 case SEC_INFO_TYPE_EH_FRAME:
10176 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10183 /* FIXME: octets_per_byte. */
10184 if (! (o->flags & SEC_EXCLUDE))
10186 file_ptr offset = (file_ptr) o->output_offset;
10187 bfd_size_type todo = o->size;
10188 if ((o->flags & SEC_ELF_REVERSE_COPY))
10190 /* Reverse-copy input section to output. */
10193 todo -= address_size;
10194 if (! bfd_set_section_contents (output_bfd,
10202 offset += address_size;
10206 else if (! bfd_set_section_contents (output_bfd,
10220 /* Generate a reloc when linking an ELF file. This is a reloc
10221 requested by the linker, and does not come from any input file. This
10222 is used to build constructor and destructor tables when linking
10226 elf_reloc_link_order (bfd *output_bfd,
10227 struct bfd_link_info *info,
10228 asection *output_section,
10229 struct bfd_link_order *link_order)
10231 reloc_howto_type *howto;
10235 struct bfd_elf_section_reloc_data *reldata;
10236 struct elf_link_hash_entry **rel_hash_ptr;
10237 Elf_Internal_Shdr *rel_hdr;
10238 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10239 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10242 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10244 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10247 bfd_set_error (bfd_error_bad_value);
10251 addend = link_order->u.reloc.p->addend;
10254 reldata = &esdo->rel;
10255 else if (esdo->rela.hdr)
10256 reldata = &esdo->rela;
10263 /* Figure out the symbol index. */
10264 rel_hash_ptr = reldata->hashes + reldata->count;
10265 if (link_order->type == bfd_section_reloc_link_order)
10267 indx = link_order->u.reloc.p->u.section->target_index;
10268 BFD_ASSERT (indx != 0);
10269 *rel_hash_ptr = NULL;
10273 struct elf_link_hash_entry *h;
10275 /* Treat a reloc against a defined symbol as though it were
10276 actually against the section. */
10277 h = ((struct elf_link_hash_entry *)
10278 bfd_wrapped_link_hash_lookup (output_bfd, info,
10279 link_order->u.reloc.p->u.name,
10280 FALSE, FALSE, TRUE));
10282 && (h->root.type == bfd_link_hash_defined
10283 || h->root.type == bfd_link_hash_defweak))
10287 section = h->root.u.def.section;
10288 indx = section->output_section->target_index;
10289 *rel_hash_ptr = NULL;
10290 /* It seems that we ought to add the symbol value to the
10291 addend here, but in practice it has already been added
10292 because it was passed to constructor_callback. */
10293 addend += section->output_section->vma + section->output_offset;
10295 else if (h != NULL)
10297 /* Setting the index to -2 tells elf_link_output_extsym that
10298 this symbol is used by a reloc. */
10305 if (! ((*info->callbacks->unattached_reloc)
10306 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10312 /* If this is an inplace reloc, we must write the addend into the
10314 if (howto->partial_inplace && addend != 0)
10316 bfd_size_type size;
10317 bfd_reloc_status_type rstat;
10320 const char *sym_name;
10322 size = (bfd_size_type) bfd_get_reloc_size (howto);
10323 buf = (bfd_byte *) bfd_zmalloc (size);
10324 if (buf == NULL && size != 0)
10326 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10333 case bfd_reloc_outofrange:
10336 case bfd_reloc_overflow:
10337 if (link_order->type == bfd_section_reloc_link_order)
10338 sym_name = bfd_section_name (output_bfd,
10339 link_order->u.reloc.p->u.section);
10341 sym_name = link_order->u.reloc.p->u.name;
10342 if (! ((*info->callbacks->reloc_overflow)
10343 (info, NULL, sym_name, howto->name, addend, NULL,
10344 NULL, (bfd_vma) 0)))
10351 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10352 link_order->offset, size);
10358 /* The address of a reloc is relative to the section in a
10359 relocatable file, and is a virtual address in an executable
10361 offset = link_order->offset;
10362 if (! info->relocatable)
10363 offset += output_section->vma;
10365 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10367 irel[i].r_offset = offset;
10368 irel[i].r_info = 0;
10369 irel[i].r_addend = 0;
10371 if (bed->s->arch_size == 32)
10372 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10374 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10376 rel_hdr = reldata->hdr;
10377 erel = rel_hdr->contents;
10378 if (rel_hdr->sh_type == SHT_REL)
10380 erel += reldata->count * bed->s->sizeof_rel;
10381 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10385 irel[0].r_addend = addend;
10386 erel += reldata->count * bed->s->sizeof_rela;
10387 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10396 /* Get the output vma of the section pointed to by the sh_link field. */
10399 elf_get_linked_section_vma (struct bfd_link_order *p)
10401 Elf_Internal_Shdr **elf_shdrp;
10405 s = p->u.indirect.section;
10406 elf_shdrp = elf_elfsections (s->owner);
10407 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10408 elfsec = elf_shdrp[elfsec]->sh_link;
10410 The Intel C compiler generates SHT_IA_64_UNWIND with
10411 SHF_LINK_ORDER. But it doesn't set the sh_link or
10412 sh_info fields. Hence we could get the situation
10413 where elfsec is 0. */
10416 const struct elf_backend_data *bed
10417 = get_elf_backend_data (s->owner);
10418 if (bed->link_order_error_handler)
10419 bed->link_order_error_handler
10420 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10425 s = elf_shdrp[elfsec]->bfd_section;
10426 return s->output_section->vma + s->output_offset;
10431 /* Compare two sections based on the locations of the sections they are
10432 linked to. Used by elf_fixup_link_order. */
10435 compare_link_order (const void * a, const void * b)
10440 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10441 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10444 return apos > bpos;
10448 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10449 order as their linked sections. Returns false if this could not be done
10450 because an output section includes both ordered and unordered
10451 sections. Ideally we'd do this in the linker proper. */
10454 elf_fixup_link_order (bfd *abfd, asection *o)
10456 int seen_linkorder;
10459 struct bfd_link_order *p;
10461 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10463 struct bfd_link_order **sections;
10464 asection *s, *other_sec, *linkorder_sec;
10468 linkorder_sec = NULL;
10470 seen_linkorder = 0;
10471 for (p = o->map_head.link_order; p != NULL; p = p->next)
10473 if (p->type == bfd_indirect_link_order)
10475 s = p->u.indirect.section;
10477 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10478 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10479 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10480 && elfsec < elf_numsections (sub)
10481 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10482 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10496 if (seen_other && seen_linkorder)
10498 if (other_sec && linkorder_sec)
10499 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10501 linkorder_sec->owner, other_sec,
10504 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10506 bfd_set_error (bfd_error_bad_value);
10511 if (!seen_linkorder)
10514 sections = (struct bfd_link_order **)
10515 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10516 if (sections == NULL)
10518 seen_linkorder = 0;
10520 for (p = o->map_head.link_order; p != NULL; p = p->next)
10522 sections[seen_linkorder++] = p;
10524 /* Sort the input sections in the order of their linked section. */
10525 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10526 compare_link_order);
10528 /* Change the offsets of the sections. */
10530 for (n = 0; n < seen_linkorder; n++)
10532 s = sections[n]->u.indirect.section;
10533 offset &= ~(bfd_vma) 0 << s->alignment_power;
10534 s->output_offset = offset;
10535 sections[n]->offset = offset;
10536 /* FIXME: octets_per_byte. */
10537 offset += sections[n]->size;
10545 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10549 if (flinfo->symstrtab != NULL)
10550 _bfd_stringtab_free (flinfo->symstrtab);
10551 if (flinfo->contents != NULL)
10552 free (flinfo->contents);
10553 if (flinfo->external_relocs != NULL)
10554 free (flinfo->external_relocs);
10555 if (flinfo->internal_relocs != NULL)
10556 free (flinfo->internal_relocs);
10557 if (flinfo->external_syms != NULL)
10558 free (flinfo->external_syms);
10559 if (flinfo->locsym_shndx != NULL)
10560 free (flinfo->locsym_shndx);
10561 if (flinfo->internal_syms != NULL)
10562 free (flinfo->internal_syms);
10563 if (flinfo->indices != NULL)
10564 free (flinfo->indices);
10565 if (flinfo->sections != NULL)
10566 free (flinfo->sections);
10567 if (flinfo->symbuf != NULL)
10568 free (flinfo->symbuf);
10569 if (flinfo->symshndxbuf != NULL)
10570 free (flinfo->symshndxbuf);
10571 for (o = obfd->sections; o != NULL; o = o->next)
10573 struct bfd_elf_section_data *esdo = elf_section_data (o);
10574 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10575 free (esdo->rel.hashes);
10576 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10577 free (esdo->rela.hashes);
10581 /* Do the final step of an ELF link. */
10584 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10586 bfd_boolean dynamic;
10587 bfd_boolean emit_relocs;
10589 struct elf_final_link_info flinfo;
10591 struct bfd_link_order *p;
10593 bfd_size_type max_contents_size;
10594 bfd_size_type max_external_reloc_size;
10595 bfd_size_type max_internal_reloc_count;
10596 bfd_size_type max_sym_count;
10597 bfd_size_type max_sym_shndx_count;
10598 Elf_Internal_Sym elfsym;
10600 Elf_Internal_Shdr *symtab_hdr;
10601 Elf_Internal_Shdr *symtab_shndx_hdr;
10602 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10603 struct elf_outext_info eoinfo;
10604 bfd_boolean merged;
10605 size_t relativecount = 0;
10606 asection *reldyn = 0;
10608 asection *attr_section = NULL;
10609 bfd_vma attr_size = 0;
10610 const char *std_attrs_section;
10612 if (! is_elf_hash_table (info->hash))
10616 abfd->flags |= DYNAMIC;
10618 dynamic = elf_hash_table (info)->dynamic_sections_created;
10619 dynobj = elf_hash_table (info)->dynobj;
10621 emit_relocs = (info->relocatable
10622 || info->emitrelocations);
10624 flinfo.info = info;
10625 flinfo.output_bfd = abfd;
10626 flinfo.symstrtab = _bfd_elf_stringtab_init ();
10627 if (flinfo.symstrtab == NULL)
10632 flinfo.dynsym_sec = NULL;
10633 flinfo.hash_sec = NULL;
10634 flinfo.symver_sec = NULL;
10638 flinfo.dynsym_sec = bfd_get_linker_section (dynobj, ".dynsym");
10639 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
10640 /* Note that dynsym_sec can be NULL (on VMS). */
10641 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
10642 /* Note that it is OK if symver_sec is NULL. */
10645 flinfo.contents = NULL;
10646 flinfo.external_relocs = NULL;
10647 flinfo.internal_relocs = NULL;
10648 flinfo.external_syms = NULL;
10649 flinfo.locsym_shndx = NULL;
10650 flinfo.internal_syms = NULL;
10651 flinfo.indices = NULL;
10652 flinfo.sections = NULL;
10653 flinfo.symbuf = NULL;
10654 flinfo.symshndxbuf = NULL;
10655 flinfo.symbuf_count = 0;
10656 flinfo.shndxbuf_size = 0;
10657 flinfo.filesym_count = 0;
10659 /* The object attributes have been merged. Remove the input
10660 sections from the link, and set the contents of the output
10662 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10663 for (o = abfd->sections; o != NULL; o = o->next)
10665 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10666 || strcmp (o->name, ".gnu.attributes") == 0)
10668 for (p = o->map_head.link_order; p != NULL; p = p->next)
10670 asection *input_section;
10672 if (p->type != bfd_indirect_link_order)
10674 input_section = p->u.indirect.section;
10675 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10676 elf_link_input_bfd ignores this section. */
10677 input_section->flags &= ~SEC_HAS_CONTENTS;
10680 attr_size = bfd_elf_obj_attr_size (abfd);
10683 bfd_set_section_size (abfd, o, attr_size);
10685 /* Skip this section later on. */
10686 o->map_head.link_order = NULL;
10689 o->flags |= SEC_EXCLUDE;
10693 /* Count up the number of relocations we will output for each output
10694 section, so that we know the sizes of the reloc sections. We
10695 also figure out some maximum sizes. */
10696 max_contents_size = 0;
10697 max_external_reloc_size = 0;
10698 max_internal_reloc_count = 0;
10700 max_sym_shndx_count = 0;
10702 for (o = abfd->sections; o != NULL; o = o->next)
10704 struct bfd_elf_section_data *esdo = elf_section_data (o);
10705 o->reloc_count = 0;
10707 for (p = o->map_head.link_order; p != NULL; p = p->next)
10709 unsigned int reloc_count = 0;
10710 struct bfd_elf_section_data *esdi = NULL;
10712 if (p->type == bfd_section_reloc_link_order
10713 || p->type == bfd_symbol_reloc_link_order)
10715 else if (p->type == bfd_indirect_link_order)
10719 sec = p->u.indirect.section;
10720 esdi = elf_section_data (sec);
10722 /* Mark all sections which are to be included in the
10723 link. This will normally be every section. We need
10724 to do this so that we can identify any sections which
10725 the linker has decided to not include. */
10726 sec->linker_mark = TRUE;
10728 if (sec->flags & SEC_MERGE)
10731 if (esdo->this_hdr.sh_type == SHT_REL
10732 || esdo->this_hdr.sh_type == SHT_RELA)
10733 /* Some backends use reloc_count in relocation sections
10734 to count particular types of relocs. Of course,
10735 reloc sections themselves can't have relocations. */
10737 else if (info->relocatable || info->emitrelocations)
10738 reloc_count = sec->reloc_count;
10739 else if (bed->elf_backend_count_relocs)
10740 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10742 if (sec->rawsize > max_contents_size)
10743 max_contents_size = sec->rawsize;
10744 if (sec->size > max_contents_size)
10745 max_contents_size = sec->size;
10747 /* We are interested in just local symbols, not all
10749 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10750 && (sec->owner->flags & DYNAMIC) == 0)
10754 if (elf_bad_symtab (sec->owner))
10755 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10756 / bed->s->sizeof_sym);
10758 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10760 if (sym_count > max_sym_count)
10761 max_sym_count = sym_count;
10763 if (sym_count > max_sym_shndx_count
10764 && elf_symtab_shndx (sec->owner) != 0)
10765 max_sym_shndx_count = sym_count;
10767 if ((sec->flags & SEC_RELOC) != 0)
10769 size_t ext_size = 0;
10771 if (esdi->rel.hdr != NULL)
10772 ext_size = esdi->rel.hdr->sh_size;
10773 if (esdi->rela.hdr != NULL)
10774 ext_size += esdi->rela.hdr->sh_size;
10776 if (ext_size > max_external_reloc_size)
10777 max_external_reloc_size = ext_size;
10778 if (sec->reloc_count > max_internal_reloc_count)
10779 max_internal_reloc_count = sec->reloc_count;
10784 if (reloc_count == 0)
10787 o->reloc_count += reloc_count;
10789 if (p->type == bfd_indirect_link_order
10790 && (info->relocatable || info->emitrelocations))
10793 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
10794 if (esdi->rela.hdr)
10795 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
10800 esdo->rela.count += reloc_count;
10802 esdo->rel.count += reloc_count;
10806 if (o->reloc_count > 0)
10807 o->flags |= SEC_RELOC;
10810 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10811 set it (this is probably a bug) and if it is set
10812 assign_section_numbers will create a reloc section. */
10813 o->flags &=~ SEC_RELOC;
10816 /* If the SEC_ALLOC flag is not set, force the section VMA to
10817 zero. This is done in elf_fake_sections as well, but forcing
10818 the VMA to 0 here will ensure that relocs against these
10819 sections are handled correctly. */
10820 if ((o->flags & SEC_ALLOC) == 0
10821 && ! o->user_set_vma)
10825 if (! info->relocatable && merged)
10826 elf_link_hash_traverse (elf_hash_table (info),
10827 _bfd_elf_link_sec_merge_syms, abfd);
10829 /* Figure out the file positions for everything but the symbol table
10830 and the relocs. We set symcount to force assign_section_numbers
10831 to create a symbol table. */
10832 bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
10833 BFD_ASSERT (! abfd->output_has_begun);
10834 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10837 /* Set sizes, and assign file positions for reloc sections. */
10838 for (o = abfd->sections; o != NULL; o = o->next)
10840 struct bfd_elf_section_data *esdo = elf_section_data (o);
10841 if ((o->flags & SEC_RELOC) != 0)
10844 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
10848 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
10852 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10853 to count upwards while actually outputting the relocations. */
10854 esdo->rel.count = 0;
10855 esdo->rela.count = 0;
10858 /* We have now assigned file positions for all the sections except
10859 .symtab, .strtab, and non-loaded reloc sections. We start the
10860 .symtab section at the current file position, and write directly
10861 to it. We build the .strtab section in memory. */
10862 bfd_get_symcount (abfd) = 0;
10863 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10864 /* sh_name is set in prep_headers. */
10865 symtab_hdr->sh_type = SHT_SYMTAB;
10866 /* sh_flags, sh_addr and sh_size all start off zero. */
10867 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10868 /* sh_link is set in assign_section_numbers. */
10869 /* sh_info is set below. */
10870 /* sh_offset is set just below. */
10871 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10873 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10874 continuously seeking to the right position in the file. */
10875 if (! info->keep_memory || max_sym_count < 20)
10876 flinfo.symbuf_size = 20;
10878 flinfo.symbuf_size = max_sym_count;
10879 amt = flinfo.symbuf_size;
10880 amt *= bed->s->sizeof_sym;
10881 flinfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10882 if (flinfo.symbuf == NULL)
10884 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10886 /* Wild guess at number of output symbols. realloc'd as needed. */
10887 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10888 flinfo.shndxbuf_size = amt;
10889 amt *= sizeof (Elf_External_Sym_Shndx);
10890 flinfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10891 if (flinfo.symshndxbuf == NULL)
10895 if (info->strip != strip_all || emit_relocs)
10897 file_ptr off = elf_next_file_pos (abfd);
10899 _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10901 /* Note that at this point elf_next_file_pos (abfd) is
10902 incorrect. We do not yet know the size of the .symtab section.
10903 We correct next_file_pos below, after we do know the size. */
10905 /* Start writing out the symbol table. The first symbol is always a
10907 elfsym.st_value = 0;
10908 elfsym.st_size = 0;
10909 elfsym.st_info = 0;
10910 elfsym.st_other = 0;
10911 elfsym.st_shndx = SHN_UNDEF;
10912 elfsym.st_target_internal = 0;
10913 if (elf_link_output_sym (&flinfo, NULL, &elfsym, bfd_und_section_ptr,
10917 /* Output a symbol for each section. We output these even if we are
10918 discarding local symbols, since they are used for relocs. These
10919 symbols have no names. We store the index of each one in the
10920 index field of the section, so that we can find it again when
10921 outputting relocs. */
10923 elfsym.st_size = 0;
10924 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10925 elfsym.st_other = 0;
10926 elfsym.st_value = 0;
10927 elfsym.st_target_internal = 0;
10928 for (i = 1; i < elf_numsections (abfd); i++)
10930 o = bfd_section_from_elf_index (abfd, i);
10933 o->target_index = bfd_get_symcount (abfd);
10934 elfsym.st_shndx = i;
10935 if (!info->relocatable)
10936 elfsym.st_value = o->vma;
10937 if (elf_link_output_sym (&flinfo, NULL, &elfsym, o, NULL) != 1)
10943 /* Allocate some memory to hold information read in from the input
10945 if (max_contents_size != 0)
10947 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10948 if (flinfo.contents == NULL)
10952 if (max_external_reloc_size != 0)
10954 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
10955 if (flinfo.external_relocs == NULL)
10959 if (max_internal_reloc_count != 0)
10961 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10962 amt *= sizeof (Elf_Internal_Rela);
10963 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10964 if (flinfo.internal_relocs == NULL)
10968 if (max_sym_count != 0)
10970 amt = max_sym_count * bed->s->sizeof_sym;
10971 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
10972 if (flinfo.external_syms == NULL)
10975 amt = max_sym_count * sizeof (Elf_Internal_Sym);
10976 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
10977 if (flinfo.internal_syms == NULL)
10980 amt = max_sym_count * sizeof (long);
10981 flinfo.indices = (long int *) bfd_malloc (amt);
10982 if (flinfo.indices == NULL)
10985 amt = max_sym_count * sizeof (asection *);
10986 flinfo.sections = (asection **) bfd_malloc (amt);
10987 if (flinfo.sections == NULL)
10991 if (max_sym_shndx_count != 0)
10993 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
10994 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
10995 if (flinfo.locsym_shndx == NULL)
10999 if (elf_hash_table (info)->tls_sec)
11001 bfd_vma base, end = 0;
11004 for (sec = elf_hash_table (info)->tls_sec;
11005 sec && (sec->flags & SEC_THREAD_LOCAL);
11008 bfd_size_type size = sec->size;
11011 && (sec->flags & SEC_HAS_CONTENTS) == 0)
11013 struct bfd_link_order *ord = sec->map_tail.link_order;
11016 size = ord->offset + ord->size;
11018 end = sec->vma + size;
11020 base = elf_hash_table (info)->tls_sec->vma;
11021 /* Only align end of TLS section if static TLS doesn't have special
11022 alignment requirements. */
11023 if (bed->static_tls_alignment == 1)
11024 end = align_power (end,
11025 elf_hash_table (info)->tls_sec->alignment_power);
11026 elf_hash_table (info)->tls_size = end - base;
11029 /* Reorder SHF_LINK_ORDER sections. */
11030 for (o = abfd->sections; o != NULL; o = o->next)
11032 if (!elf_fixup_link_order (abfd, o))
11036 /* Since ELF permits relocations to be against local symbols, we
11037 must have the local symbols available when we do the relocations.
11038 Since we would rather only read the local symbols once, and we
11039 would rather not keep them in memory, we handle all the
11040 relocations for a single input file at the same time.
11042 Unfortunately, there is no way to know the total number of local
11043 symbols until we have seen all of them, and the local symbol
11044 indices precede the global symbol indices. This means that when
11045 we are generating relocatable output, and we see a reloc against
11046 a global symbol, we can not know the symbol index until we have
11047 finished examining all the local symbols to see which ones we are
11048 going to output. To deal with this, we keep the relocations in
11049 memory, and don't output them until the end of the link. This is
11050 an unfortunate waste of memory, but I don't see a good way around
11051 it. Fortunately, it only happens when performing a relocatable
11052 link, which is not the common case. FIXME: If keep_memory is set
11053 we could write the relocs out and then read them again; I don't
11054 know how bad the memory loss will be. */
11056 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11057 sub->output_has_begun = FALSE;
11058 for (o = abfd->sections; o != NULL; o = o->next)
11060 for (p = o->map_head.link_order; p != NULL; p = p->next)
11062 if (p->type == bfd_indirect_link_order
11063 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
11064 == bfd_target_elf_flavour)
11065 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
11067 if (! sub->output_has_begun)
11069 if (! elf_link_input_bfd (&flinfo, sub))
11071 sub->output_has_begun = TRUE;
11074 else if (p->type == bfd_section_reloc_link_order
11075 || p->type == bfd_symbol_reloc_link_order)
11077 if (! elf_reloc_link_order (abfd, info, o, p))
11082 if (! _bfd_default_link_order (abfd, info, o, p))
11084 if (p->type == bfd_indirect_link_order
11085 && (bfd_get_flavour (sub)
11086 == bfd_target_elf_flavour)
11087 && (elf_elfheader (sub)->e_ident[EI_CLASS]
11088 != bed->s->elfclass))
11090 const char *iclass, *oclass;
11092 if (bed->s->elfclass == ELFCLASS64)
11094 iclass = "ELFCLASS32";
11095 oclass = "ELFCLASS64";
11099 iclass = "ELFCLASS64";
11100 oclass = "ELFCLASS32";
11103 bfd_set_error (bfd_error_wrong_format);
11104 (*_bfd_error_handler)
11105 (_("%B: file class %s incompatible with %s"),
11106 sub, iclass, oclass);
11115 /* Free symbol buffer if needed. */
11116 if (!info->reduce_memory_overheads)
11118 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11119 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
11120 && elf_tdata (sub)->symbuf)
11122 free (elf_tdata (sub)->symbuf);
11123 elf_tdata (sub)->symbuf = NULL;
11127 /* Output any global symbols that got converted to local in a
11128 version script or due to symbol visibility. We do this in a
11129 separate step since ELF requires all local symbols to appear
11130 prior to any global symbols. FIXME: We should only do this if
11131 some global symbols were, in fact, converted to become local.
11132 FIXME: Will this work correctly with the Irix 5 linker? */
11133 eoinfo.failed = FALSE;
11134 eoinfo.flinfo = &flinfo;
11135 eoinfo.localsyms = TRUE;
11136 eoinfo.need_second_pass = FALSE;
11137 eoinfo.second_pass = FALSE;
11138 eoinfo.file_sym_done = FALSE;
11139 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11143 if (eoinfo.need_second_pass)
11145 eoinfo.second_pass = TRUE;
11146 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11151 /* If backend needs to output some local symbols not present in the hash
11152 table, do it now. */
11153 if (bed->elf_backend_output_arch_local_syms
11154 && (info->strip != strip_all || emit_relocs))
11156 typedef int (*out_sym_func)
11157 (void *, const char *, Elf_Internal_Sym *, asection *,
11158 struct elf_link_hash_entry *);
11160 if (! ((*bed->elf_backend_output_arch_local_syms)
11161 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11165 /* That wrote out all the local symbols. Finish up the symbol table
11166 with the global symbols. Even if we want to strip everything we
11167 can, we still need to deal with those global symbols that got
11168 converted to local in a version script. */
11170 /* The sh_info field records the index of the first non local symbol. */
11171 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11174 && flinfo.dynsym_sec != NULL
11175 && flinfo.dynsym_sec->output_section != bfd_abs_section_ptr)
11177 Elf_Internal_Sym sym;
11178 bfd_byte *dynsym = flinfo.dynsym_sec->contents;
11179 long last_local = 0;
11181 /* Write out the section symbols for the output sections. */
11182 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
11188 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11190 sym.st_target_internal = 0;
11192 for (s = abfd->sections; s != NULL; s = s->next)
11198 dynindx = elf_section_data (s)->dynindx;
11201 indx = elf_section_data (s)->this_idx;
11202 BFD_ASSERT (indx > 0);
11203 sym.st_shndx = indx;
11204 if (! check_dynsym (abfd, &sym))
11206 sym.st_value = s->vma;
11207 dest = dynsym + dynindx * bed->s->sizeof_sym;
11208 if (last_local < dynindx)
11209 last_local = dynindx;
11210 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11214 /* Write out the local dynsyms. */
11215 if (elf_hash_table (info)->dynlocal)
11217 struct elf_link_local_dynamic_entry *e;
11218 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11223 /* Copy the internal symbol and turn off visibility.
11224 Note that we saved a word of storage and overwrote
11225 the original st_name with the dynstr_index. */
11227 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11229 s = bfd_section_from_elf_index (e->input_bfd,
11234 elf_section_data (s->output_section)->this_idx;
11235 if (! check_dynsym (abfd, &sym))
11237 sym.st_value = (s->output_section->vma
11239 + e->isym.st_value);
11242 if (last_local < e->dynindx)
11243 last_local = e->dynindx;
11245 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11246 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11250 elf_section_data (flinfo.dynsym_sec->output_section)->this_hdr.sh_info =
11254 /* We get the global symbols from the hash table. */
11255 eoinfo.failed = FALSE;
11256 eoinfo.localsyms = FALSE;
11257 eoinfo.flinfo = &flinfo;
11258 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11262 /* If backend needs to output some symbols not present in the hash
11263 table, do it now. */
11264 if (bed->elf_backend_output_arch_syms
11265 && (info->strip != strip_all || emit_relocs))
11267 typedef int (*out_sym_func)
11268 (void *, const char *, Elf_Internal_Sym *, asection *,
11269 struct elf_link_hash_entry *);
11271 if (! ((*bed->elf_backend_output_arch_syms)
11272 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11276 /* Flush all symbols to the file. */
11277 if (! elf_link_flush_output_syms (&flinfo, bed))
11280 /* Now we know the size of the symtab section. */
11281 if (bfd_get_symcount (abfd) > 0)
11283 /* Finish up and write out the symbol string table (.strtab)
11285 Elf_Internal_Shdr *symstrtab_hdr;
11286 file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
11288 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
11289 if (symtab_shndx_hdr->sh_name != 0)
11291 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11292 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11293 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11294 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11295 symtab_shndx_hdr->sh_size = amt;
11297 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11300 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11301 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11305 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11306 /* sh_name was set in prep_headers. */
11307 symstrtab_hdr->sh_type = SHT_STRTAB;
11308 symstrtab_hdr->sh_flags = 0;
11309 symstrtab_hdr->sh_addr = 0;
11310 symstrtab_hdr->sh_size = _bfd_stringtab_size (flinfo.symstrtab);
11311 symstrtab_hdr->sh_entsize = 0;
11312 symstrtab_hdr->sh_link = 0;
11313 symstrtab_hdr->sh_info = 0;
11314 /* sh_offset is set just below. */
11315 symstrtab_hdr->sh_addralign = 1;
11317 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
11319 elf_next_file_pos (abfd) = off;
11321 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11322 || ! _bfd_stringtab_emit (abfd, flinfo.symstrtab))
11326 /* Adjust the relocs to have the correct symbol indices. */
11327 for (o = abfd->sections; o != NULL; o = o->next)
11329 struct bfd_elf_section_data *esdo = elf_section_data (o);
11331 if ((o->flags & SEC_RELOC) == 0)
11334 sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o);
11335 if (esdo->rel.hdr != NULL)
11336 elf_link_adjust_relocs (abfd, &esdo->rel, sort);
11337 if (esdo->rela.hdr != NULL)
11338 elf_link_adjust_relocs (abfd, &esdo->rela, sort);
11340 /* Set the reloc_count field to 0 to prevent write_relocs from
11341 trying to swap the relocs out itself. */
11342 o->reloc_count = 0;
11345 if (dynamic && info->combreloc && dynobj != NULL)
11346 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11348 /* If we are linking against a dynamic object, or generating a
11349 shared library, finish up the dynamic linking information. */
11352 bfd_byte *dyncon, *dynconend;
11354 /* Fix up .dynamic entries. */
11355 o = bfd_get_linker_section (dynobj, ".dynamic");
11356 BFD_ASSERT (o != NULL);
11358 dyncon = o->contents;
11359 dynconend = o->contents + o->size;
11360 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11362 Elf_Internal_Dyn dyn;
11366 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11373 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11375 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11377 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11378 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11381 dyn.d_un.d_val = relativecount;
11388 name = info->init_function;
11391 name = info->fini_function;
11394 struct elf_link_hash_entry *h;
11396 h = elf_link_hash_lookup (elf_hash_table (info), name,
11397 FALSE, FALSE, TRUE);
11399 && (h->root.type == bfd_link_hash_defined
11400 || h->root.type == bfd_link_hash_defweak))
11402 dyn.d_un.d_ptr = h->root.u.def.value;
11403 o = h->root.u.def.section;
11404 if (o->output_section != NULL)
11405 dyn.d_un.d_ptr += (o->output_section->vma
11406 + o->output_offset);
11409 /* The symbol is imported from another shared
11410 library and does not apply to this one. */
11411 dyn.d_un.d_ptr = 0;
11418 case DT_PREINIT_ARRAYSZ:
11419 name = ".preinit_array";
11421 case DT_INIT_ARRAYSZ:
11422 name = ".init_array";
11424 case DT_FINI_ARRAYSZ:
11425 name = ".fini_array";
11427 o = bfd_get_section_by_name (abfd, name);
11430 (*_bfd_error_handler)
11431 (_("%B: could not find output section %s"), abfd, name);
11435 (*_bfd_error_handler)
11436 (_("warning: %s section has zero size"), name);
11437 dyn.d_un.d_val = o->size;
11440 case DT_PREINIT_ARRAY:
11441 name = ".preinit_array";
11443 case DT_INIT_ARRAY:
11444 name = ".init_array";
11446 case DT_FINI_ARRAY:
11447 name = ".fini_array";
11454 name = ".gnu.hash";
11463 name = ".gnu.version_d";
11466 name = ".gnu.version_r";
11469 name = ".gnu.version";
11471 o = bfd_get_section_by_name (abfd, name);
11474 (*_bfd_error_handler)
11475 (_("%B: could not find output section %s"), abfd, name);
11478 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11480 (*_bfd_error_handler)
11481 (_("warning: section '%s' is being made into a note"), name);
11482 bfd_set_error (bfd_error_nonrepresentable_section);
11485 dyn.d_un.d_ptr = o->vma;
11492 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11496 dyn.d_un.d_val = 0;
11497 dyn.d_un.d_ptr = 0;
11498 for (i = 1; i < elf_numsections (abfd); i++)
11500 Elf_Internal_Shdr *hdr;
11502 hdr = elf_elfsections (abfd)[i];
11503 if (hdr->sh_type == type
11504 && (hdr->sh_flags & SHF_ALLOC) != 0)
11506 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11507 dyn.d_un.d_val += hdr->sh_size;
11510 if (dyn.d_un.d_ptr == 0
11511 || hdr->sh_addr < dyn.d_un.d_ptr)
11512 dyn.d_un.d_ptr = hdr->sh_addr;
11518 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11522 /* If we have created any dynamic sections, then output them. */
11523 if (dynobj != NULL)
11525 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11528 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11529 if (((info->warn_shared_textrel && info->shared)
11530 || info->error_textrel)
11531 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11533 bfd_byte *dyncon, *dynconend;
11535 dyncon = o->contents;
11536 dynconend = o->contents + o->size;
11537 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11539 Elf_Internal_Dyn dyn;
11541 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11543 if (dyn.d_tag == DT_TEXTREL)
11545 if (info->error_textrel)
11546 info->callbacks->einfo
11547 (_("%P%X: read-only segment has dynamic relocations.\n"));
11549 info->callbacks->einfo
11550 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11556 for (o = dynobj->sections; o != NULL; o = o->next)
11558 if ((o->flags & SEC_HAS_CONTENTS) == 0
11560 || o->output_section == bfd_abs_section_ptr)
11562 if ((o->flags & SEC_LINKER_CREATED) == 0)
11564 /* At this point, we are only interested in sections
11565 created by _bfd_elf_link_create_dynamic_sections. */
11568 if (elf_hash_table (info)->stab_info.stabstr == o)
11570 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11572 if (strcmp (o->name, ".dynstr") != 0)
11574 /* FIXME: octets_per_byte. */
11575 if (! bfd_set_section_contents (abfd, o->output_section,
11577 (file_ptr) o->output_offset,
11583 /* The contents of the .dynstr section are actually in a
11587 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11588 if (bfd_seek (abfd, off, SEEK_SET) != 0
11589 || ! _bfd_elf_strtab_emit (abfd,
11590 elf_hash_table (info)->dynstr))
11596 if (info->relocatable)
11598 bfd_boolean failed = FALSE;
11600 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11605 /* If we have optimized stabs strings, output them. */
11606 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11608 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11612 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11615 elf_final_link_free (abfd, &flinfo);
11617 elf_linker (abfd) = TRUE;
11621 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11622 if (contents == NULL)
11623 return FALSE; /* Bail out and fail. */
11624 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11625 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11632 elf_final_link_free (abfd, &flinfo);
11636 /* Initialize COOKIE for input bfd ABFD. */
11639 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11640 struct bfd_link_info *info, bfd *abfd)
11642 Elf_Internal_Shdr *symtab_hdr;
11643 const struct elf_backend_data *bed;
11645 bed = get_elf_backend_data (abfd);
11646 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11648 cookie->abfd = abfd;
11649 cookie->sym_hashes = elf_sym_hashes (abfd);
11650 cookie->bad_symtab = elf_bad_symtab (abfd);
11651 if (cookie->bad_symtab)
11653 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11654 cookie->extsymoff = 0;
11658 cookie->locsymcount = symtab_hdr->sh_info;
11659 cookie->extsymoff = symtab_hdr->sh_info;
11662 if (bed->s->arch_size == 32)
11663 cookie->r_sym_shift = 8;
11665 cookie->r_sym_shift = 32;
11667 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11668 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11670 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11671 cookie->locsymcount, 0,
11673 if (cookie->locsyms == NULL)
11675 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11678 if (info->keep_memory)
11679 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11684 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11687 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11689 Elf_Internal_Shdr *symtab_hdr;
11691 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11692 if (cookie->locsyms != NULL
11693 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11694 free (cookie->locsyms);
11697 /* Initialize the relocation information in COOKIE for input section SEC
11698 of input bfd ABFD. */
11701 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11702 struct bfd_link_info *info, bfd *abfd,
11705 const struct elf_backend_data *bed;
11707 if (sec->reloc_count == 0)
11709 cookie->rels = NULL;
11710 cookie->relend = NULL;
11714 bed = get_elf_backend_data (abfd);
11716 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11717 info->keep_memory);
11718 if (cookie->rels == NULL)
11720 cookie->rel = cookie->rels;
11721 cookie->relend = (cookie->rels
11722 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11724 cookie->rel = cookie->rels;
11728 /* Free the memory allocated by init_reloc_cookie_rels,
11732 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11735 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11736 free (cookie->rels);
11739 /* Initialize the whole of COOKIE for input section SEC. */
11742 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11743 struct bfd_link_info *info,
11746 if (!init_reloc_cookie (cookie, info, sec->owner))
11748 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11753 fini_reloc_cookie (cookie, sec->owner);
11758 /* Free the memory allocated by init_reloc_cookie_for_section,
11762 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11765 fini_reloc_cookie_rels (cookie, sec);
11766 fini_reloc_cookie (cookie, sec->owner);
11769 /* Garbage collect unused sections. */
11771 /* Default gc_mark_hook. */
11774 _bfd_elf_gc_mark_hook (asection *sec,
11775 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11776 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11777 struct elf_link_hash_entry *h,
11778 Elf_Internal_Sym *sym)
11780 const char *sec_name;
11784 switch (h->root.type)
11786 case bfd_link_hash_defined:
11787 case bfd_link_hash_defweak:
11788 return h->root.u.def.section;
11790 case bfd_link_hash_common:
11791 return h->root.u.c.p->section;
11793 case bfd_link_hash_undefined:
11794 case bfd_link_hash_undefweak:
11795 /* To work around a glibc bug, keep all XXX input sections
11796 when there is an as yet undefined reference to __start_XXX
11797 or __stop_XXX symbols. The linker will later define such
11798 symbols for orphan input sections that have a name
11799 representable as a C identifier. */
11800 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11801 sec_name = h->root.root.string + 8;
11802 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11803 sec_name = h->root.root.string + 7;
11807 if (sec_name && *sec_name != '\0')
11811 for (i = info->input_bfds; i; i = i->link.next)
11813 sec = bfd_get_section_by_name (i, sec_name);
11815 sec->flags |= SEC_KEEP;
11825 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11830 /* COOKIE->rel describes a relocation against section SEC, which is
11831 a section we've decided to keep. Return the section that contains
11832 the relocation symbol, or NULL if no section contains it. */
11835 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11836 elf_gc_mark_hook_fn gc_mark_hook,
11837 struct elf_reloc_cookie *cookie)
11839 unsigned long r_symndx;
11840 struct elf_link_hash_entry *h;
11842 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11843 if (r_symndx == STN_UNDEF)
11846 if (r_symndx >= cookie->locsymcount
11847 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11849 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11852 info->callbacks->einfo (_("%F%P: corrupt input: %B\n"),
11856 while (h->root.type == bfd_link_hash_indirect
11857 || h->root.type == bfd_link_hash_warning)
11858 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11860 /* If this symbol is weak and there is a non-weak definition, we
11861 keep the non-weak definition because many backends put
11862 dynamic reloc info on the non-weak definition for code
11863 handling copy relocs. */
11864 if (h->u.weakdef != NULL)
11865 h->u.weakdef->mark = 1;
11866 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11869 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11870 &cookie->locsyms[r_symndx]);
11873 /* COOKIE->rel describes a relocation against section SEC, which is
11874 a section we've decided to keep. Mark the section that contains
11875 the relocation symbol. */
11878 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11880 elf_gc_mark_hook_fn gc_mark_hook,
11881 struct elf_reloc_cookie *cookie)
11885 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11886 if (rsec && !rsec->gc_mark)
11888 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
11889 || (rsec->owner->flags & DYNAMIC) != 0)
11891 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11897 /* The mark phase of garbage collection. For a given section, mark
11898 it and any sections in this section's group, and all the sections
11899 which define symbols to which it refers. */
11902 _bfd_elf_gc_mark (struct bfd_link_info *info,
11904 elf_gc_mark_hook_fn gc_mark_hook)
11907 asection *group_sec, *eh_frame;
11911 /* Mark all the sections in the group. */
11912 group_sec = elf_section_data (sec)->next_in_group;
11913 if (group_sec && !group_sec->gc_mark)
11914 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11917 /* Look through the section relocs. */
11919 eh_frame = elf_eh_frame_section (sec->owner);
11920 if ((sec->flags & SEC_RELOC) != 0
11921 && sec->reloc_count > 0
11922 && sec != eh_frame)
11924 struct elf_reloc_cookie cookie;
11926 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11930 for (; cookie.rel < cookie.relend; cookie.rel++)
11931 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11936 fini_reloc_cookie_for_section (&cookie, sec);
11940 if (ret && eh_frame && elf_fde_list (sec))
11942 struct elf_reloc_cookie cookie;
11944 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11948 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11949 gc_mark_hook, &cookie))
11951 fini_reloc_cookie_for_section (&cookie, eh_frame);
11958 /* Keep debug and special sections. */
11961 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
11962 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
11966 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
11969 bfd_boolean some_kept;
11970 bfd_boolean debug_frag_seen;
11972 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
11975 /* Ensure all linker created sections are kept,
11976 see if any other section is already marked,
11977 and note if we have any fragmented debug sections. */
11978 debug_frag_seen = some_kept = FALSE;
11979 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11981 if ((isec->flags & SEC_LINKER_CREATED) != 0)
11983 else if (isec->gc_mark)
11986 if (debug_frag_seen == FALSE
11987 && (isec->flags & SEC_DEBUGGING)
11988 && CONST_STRNEQ (isec->name, ".debug_line."))
11989 debug_frag_seen = TRUE;
11992 /* If no section in this file will be kept, then we can
11993 toss out the debug and special sections. */
11997 /* Keep debug and special sections like .comment when they are
11998 not part of a group, or when we have single-member groups. */
11999 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12000 if ((elf_next_in_group (isec) == NULL
12001 || elf_next_in_group (isec) == isec)
12002 && ((isec->flags & SEC_DEBUGGING) != 0
12003 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0))
12006 if (! debug_frag_seen)
12009 /* Look for CODE sections which are going to be discarded,
12010 and find and discard any fragmented debug sections which
12011 are associated with that code section. */
12012 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12013 if ((isec->flags & SEC_CODE) != 0
12014 && isec->gc_mark == 0)
12019 ilen = strlen (isec->name);
12021 /* Association is determined by the name of the debug section
12022 containing the name of the code section as a suffix. For
12023 example .debug_line.text.foo is a debug section associated
12025 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
12029 if (dsec->gc_mark == 0
12030 || (dsec->flags & SEC_DEBUGGING) == 0)
12033 dlen = strlen (dsec->name);
12036 && strncmp (dsec->name + (dlen - ilen),
12037 isec->name, ilen) == 0)
12048 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
12050 struct elf_gc_sweep_symbol_info
12052 struct bfd_link_info *info;
12053 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
12058 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
12061 && (((h->root.type == bfd_link_hash_defined
12062 || h->root.type == bfd_link_hash_defweak)
12063 && !((h->def_regular || ELF_COMMON_DEF_P (h))
12064 && h->root.u.def.section->gc_mark))
12065 || h->root.type == bfd_link_hash_undefined
12066 || h->root.type == bfd_link_hash_undefweak))
12068 struct elf_gc_sweep_symbol_info *inf;
12070 inf = (struct elf_gc_sweep_symbol_info *) data;
12071 (*inf->hide_symbol) (inf->info, h, TRUE);
12072 h->def_regular = 0;
12073 h->ref_regular = 0;
12074 h->ref_regular_nonweak = 0;
12080 /* The sweep phase of garbage collection. Remove all garbage sections. */
12082 typedef bfd_boolean (*gc_sweep_hook_fn)
12083 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
12086 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
12089 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12090 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
12091 unsigned long section_sym_count;
12092 struct elf_gc_sweep_symbol_info sweep_info;
12094 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12098 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12101 for (o = sub->sections; o != NULL; o = o->next)
12103 /* When any section in a section group is kept, we keep all
12104 sections in the section group. If the first member of
12105 the section group is excluded, we will also exclude the
12107 if (o->flags & SEC_GROUP)
12109 asection *first = elf_next_in_group (o);
12110 o->gc_mark = first->gc_mark;
12116 /* Skip sweeping sections already excluded. */
12117 if (o->flags & SEC_EXCLUDE)
12120 /* Since this is early in the link process, it is simple
12121 to remove a section from the output. */
12122 o->flags |= SEC_EXCLUDE;
12124 if (info->print_gc_sections && o->size != 0)
12125 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
12127 /* But we also have to update some of the relocation
12128 info we collected before. */
12130 && (o->flags & SEC_RELOC) != 0
12131 && o->reloc_count != 0
12132 && !((info->strip == strip_all || info->strip == strip_debugger)
12133 && (o->flags & SEC_DEBUGGING) != 0)
12134 && !bfd_is_abs_section (o->output_section))
12136 Elf_Internal_Rela *internal_relocs;
12140 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
12141 info->keep_memory);
12142 if (internal_relocs == NULL)
12145 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
12147 if (elf_section_data (o)->relocs != internal_relocs)
12148 free (internal_relocs);
12156 /* Remove the symbols that were in the swept sections from the dynamic
12157 symbol table. GCFIXME: Anyone know how to get them out of the
12158 static symbol table as well? */
12159 sweep_info.info = info;
12160 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
12161 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
12164 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
12168 /* Propagate collected vtable information. This is called through
12169 elf_link_hash_traverse. */
12172 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
12174 /* Those that are not vtables. */
12175 if (h->vtable == NULL || h->vtable->parent == NULL)
12178 /* Those vtables that do not have parents, we cannot merge. */
12179 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12182 /* If we've already been done, exit. */
12183 if (h->vtable->used && h->vtable->used[-1])
12186 /* Make sure the parent's table is up to date. */
12187 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12189 if (h->vtable->used == NULL)
12191 /* None of this table's entries were referenced. Re-use the
12193 h->vtable->used = h->vtable->parent->vtable->used;
12194 h->vtable->size = h->vtable->parent->vtable->size;
12199 bfd_boolean *cu, *pu;
12201 /* Or the parent's entries into ours. */
12202 cu = h->vtable->used;
12204 pu = h->vtable->parent->vtable->used;
12207 const struct elf_backend_data *bed;
12208 unsigned int log_file_align;
12210 bed = get_elf_backend_data (h->root.u.def.section->owner);
12211 log_file_align = bed->s->log_file_align;
12212 n = h->vtable->parent->vtable->size >> log_file_align;
12227 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12230 bfd_vma hstart, hend;
12231 Elf_Internal_Rela *relstart, *relend, *rel;
12232 const struct elf_backend_data *bed;
12233 unsigned int log_file_align;
12235 /* Take care of both those symbols that do not describe vtables as
12236 well as those that are not loaded. */
12237 if (h->vtable == NULL || h->vtable->parent == NULL)
12240 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12241 || h->root.type == bfd_link_hash_defweak);
12243 sec = h->root.u.def.section;
12244 hstart = h->root.u.def.value;
12245 hend = hstart + h->size;
12247 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12249 return *(bfd_boolean *) okp = FALSE;
12250 bed = get_elf_backend_data (sec->owner);
12251 log_file_align = bed->s->log_file_align;
12253 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12255 for (rel = relstart; rel < relend; ++rel)
12256 if (rel->r_offset >= hstart && rel->r_offset < hend)
12258 /* If the entry is in use, do nothing. */
12259 if (h->vtable->used
12260 && (rel->r_offset - hstart) < h->vtable->size)
12262 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12263 if (h->vtable->used[entry])
12266 /* Otherwise, kill it. */
12267 rel->r_offset = rel->r_info = rel->r_addend = 0;
12273 /* Mark sections containing dynamically referenced symbols. When
12274 building shared libraries, we must assume that any visible symbol is
12278 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12280 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12281 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12283 if ((h->root.type == bfd_link_hash_defined
12284 || h->root.type == bfd_link_hash_defweak)
12286 || ((h->def_regular || ELF_COMMON_DEF_P (h))
12287 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12288 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12289 && (!info->executable
12290 || info->export_dynamic
12293 && (*d->match) (&d->head, NULL, h->root.root.string)))
12294 && (strchr (h->root.root.string, ELF_VER_CHR) != NULL
12295 || !bfd_hide_sym_by_version (info->version_info,
12296 h->root.root.string)))))
12297 h->root.u.def.section->flags |= SEC_KEEP;
12302 /* Keep all sections containing symbols undefined on the command-line,
12303 and the section containing the entry symbol. */
12306 _bfd_elf_gc_keep (struct bfd_link_info *info)
12308 struct bfd_sym_chain *sym;
12310 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12312 struct elf_link_hash_entry *h;
12314 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12315 FALSE, FALSE, FALSE);
12318 && (h->root.type == bfd_link_hash_defined
12319 || h->root.type == bfd_link_hash_defweak)
12320 && !bfd_is_abs_section (h->root.u.def.section))
12321 h->root.u.def.section->flags |= SEC_KEEP;
12325 /* Do mark and sweep of unused sections. */
12328 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12330 bfd_boolean ok = TRUE;
12332 elf_gc_mark_hook_fn gc_mark_hook;
12333 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12334 struct elf_link_hash_table *htab;
12336 if (!bed->can_gc_sections
12337 || !is_elf_hash_table (info->hash))
12339 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12343 bed->gc_keep (info);
12344 htab = elf_hash_table (info);
12346 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12347 at the .eh_frame section if we can mark the FDEs individually. */
12348 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12351 struct elf_reloc_cookie cookie;
12353 sec = bfd_get_section_by_name (sub, ".eh_frame");
12354 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12356 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12357 if (elf_section_data (sec)->sec_info
12358 && (sec->flags & SEC_LINKER_CREATED) == 0)
12359 elf_eh_frame_section (sub) = sec;
12360 fini_reloc_cookie_for_section (&cookie, sec);
12361 sec = bfd_get_next_section_by_name (sec);
12365 /* Apply transitive closure to the vtable entry usage info. */
12366 elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
12370 /* Kill the vtable relocations that were not used. */
12371 elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
12375 /* Mark dynamically referenced symbols. */
12376 if (htab->dynamic_sections_created)
12377 elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
12379 /* Grovel through relocs to find out who stays ... */
12380 gc_mark_hook = bed->gc_mark_hook;
12381 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12385 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12388 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12389 Also treat note sections as a root, if the section is not part
12391 for (o = sub->sections; o != NULL; o = o->next)
12393 && (o->flags & SEC_EXCLUDE) == 0
12394 && ((o->flags & SEC_KEEP) != 0
12395 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12396 && elf_next_in_group (o) == NULL )))
12398 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12403 /* Allow the backend to mark additional target specific sections. */
12404 bed->gc_mark_extra_sections (info, gc_mark_hook);
12406 /* ... and mark SEC_EXCLUDE for those that go. */
12407 return elf_gc_sweep (abfd, info);
12410 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12413 bfd_elf_gc_record_vtinherit (bfd *abfd,
12415 struct elf_link_hash_entry *h,
12418 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12419 struct elf_link_hash_entry **search, *child;
12420 bfd_size_type extsymcount;
12421 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12423 /* The sh_info field of the symtab header tells us where the
12424 external symbols start. We don't care about the local symbols at
12426 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12427 if (!elf_bad_symtab (abfd))
12428 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12430 sym_hashes = elf_sym_hashes (abfd);
12431 sym_hashes_end = sym_hashes + extsymcount;
12433 /* Hunt down the child symbol, which is in this section at the same
12434 offset as the relocation. */
12435 for (search = sym_hashes; search != sym_hashes_end; ++search)
12437 if ((child = *search) != NULL
12438 && (child->root.type == bfd_link_hash_defined
12439 || child->root.type == bfd_link_hash_defweak)
12440 && child->root.u.def.section == sec
12441 && child->root.u.def.value == offset)
12445 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12446 abfd, sec, (unsigned long) offset);
12447 bfd_set_error (bfd_error_invalid_operation);
12451 if (!child->vtable)
12453 child->vtable = (struct elf_link_virtual_table_entry *)
12454 bfd_zalloc (abfd, sizeof (*child->vtable));
12455 if (!child->vtable)
12460 /* This *should* only be the absolute section. It could potentially
12461 be that someone has defined a non-global vtable though, which
12462 would be bad. It isn't worth paging in the local symbols to be
12463 sure though; that case should simply be handled by the assembler. */
12465 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12468 child->vtable->parent = h;
12473 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12476 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12477 asection *sec ATTRIBUTE_UNUSED,
12478 struct elf_link_hash_entry *h,
12481 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12482 unsigned int log_file_align = bed->s->log_file_align;
12486 h->vtable = (struct elf_link_virtual_table_entry *)
12487 bfd_zalloc (abfd, sizeof (*h->vtable));
12492 if (addend >= h->vtable->size)
12494 size_t size, bytes, file_align;
12495 bfd_boolean *ptr = h->vtable->used;
12497 /* While the symbol is undefined, we have to be prepared to handle
12499 file_align = 1 << log_file_align;
12500 if (h->root.type == bfd_link_hash_undefined)
12501 size = addend + file_align;
12505 if (addend >= size)
12507 /* Oops! We've got a reference past the defined end of
12508 the table. This is probably a bug -- shall we warn? */
12509 size = addend + file_align;
12512 size = (size + file_align - 1) & -file_align;
12514 /* Allocate one extra entry for use as a "done" flag for the
12515 consolidation pass. */
12516 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12520 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12526 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12527 * sizeof (bfd_boolean));
12528 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12532 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12537 /* And arrange for that done flag to be at index -1. */
12538 h->vtable->used = ptr + 1;
12539 h->vtable->size = size;
12542 h->vtable->used[addend >> log_file_align] = TRUE;
12547 /* Map an ELF section header flag to its corresponding string. */
12551 flagword flag_value;
12552 } elf_flags_to_name_table;
12554 static elf_flags_to_name_table elf_flags_to_names [] =
12556 { "SHF_WRITE", SHF_WRITE },
12557 { "SHF_ALLOC", SHF_ALLOC },
12558 { "SHF_EXECINSTR", SHF_EXECINSTR },
12559 { "SHF_MERGE", SHF_MERGE },
12560 { "SHF_STRINGS", SHF_STRINGS },
12561 { "SHF_INFO_LINK", SHF_INFO_LINK},
12562 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
12563 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
12564 { "SHF_GROUP", SHF_GROUP },
12565 { "SHF_TLS", SHF_TLS },
12566 { "SHF_MASKOS", SHF_MASKOS },
12567 { "SHF_EXCLUDE", SHF_EXCLUDE },
12570 /* Returns TRUE if the section is to be included, otherwise FALSE. */
12572 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
12573 struct flag_info *flaginfo,
12576 const bfd_vma sh_flags = elf_section_flags (section);
12578 if (!flaginfo->flags_initialized)
12580 bfd *obfd = info->output_bfd;
12581 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12582 struct flag_info_list *tf = flaginfo->flag_list;
12584 int without_hex = 0;
12586 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
12589 flagword (*lookup) (char *);
12591 lookup = bed->elf_backend_lookup_section_flags_hook;
12592 if (lookup != NULL)
12594 flagword hexval = (*lookup) ((char *) tf->name);
12598 if (tf->with == with_flags)
12599 with_hex |= hexval;
12600 else if (tf->with == without_flags)
12601 without_hex |= hexval;
12606 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
12608 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
12610 if (tf->with == with_flags)
12611 with_hex |= elf_flags_to_names[i].flag_value;
12612 else if (tf->with == without_flags)
12613 without_hex |= elf_flags_to_names[i].flag_value;
12620 info->callbacks->einfo
12621 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
12625 flaginfo->flags_initialized = TRUE;
12626 flaginfo->only_with_flags |= with_hex;
12627 flaginfo->not_with_flags |= without_hex;
12630 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
12633 if ((flaginfo->not_with_flags & sh_flags) != 0)
12639 struct alloc_got_off_arg {
12641 struct bfd_link_info *info;
12644 /* We need a special top-level link routine to convert got reference counts
12645 to real got offsets. */
12648 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12650 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12651 bfd *obfd = gofarg->info->output_bfd;
12652 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12654 if (h->got.refcount > 0)
12656 h->got.offset = gofarg->gotoff;
12657 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12660 h->got.offset = (bfd_vma) -1;
12665 /* And an accompanying bit to work out final got entry offsets once
12666 we're done. Should be called from final_link. */
12669 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12670 struct bfd_link_info *info)
12673 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12675 struct alloc_got_off_arg gofarg;
12677 BFD_ASSERT (abfd == info->output_bfd);
12679 if (! is_elf_hash_table (info->hash))
12682 /* The GOT offset is relative to the .got section, but the GOT header is
12683 put into the .got.plt section, if the backend uses it. */
12684 if (bed->want_got_plt)
12687 gotoff = bed->got_header_size;
12689 /* Do the local .got entries first. */
12690 for (i = info->input_bfds; i; i = i->link.next)
12692 bfd_signed_vma *local_got;
12693 bfd_size_type j, locsymcount;
12694 Elf_Internal_Shdr *symtab_hdr;
12696 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12699 local_got = elf_local_got_refcounts (i);
12703 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12704 if (elf_bad_symtab (i))
12705 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12707 locsymcount = symtab_hdr->sh_info;
12709 for (j = 0; j < locsymcount; ++j)
12711 if (local_got[j] > 0)
12713 local_got[j] = gotoff;
12714 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12717 local_got[j] = (bfd_vma) -1;
12721 /* Then the global .got entries. .plt refcounts are handled by
12722 adjust_dynamic_symbol */
12723 gofarg.gotoff = gotoff;
12724 gofarg.info = info;
12725 elf_link_hash_traverse (elf_hash_table (info),
12726 elf_gc_allocate_got_offsets,
12731 /* Many folk need no more in the way of final link than this, once
12732 got entry reference counting is enabled. */
12735 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12737 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12740 /* Invoke the regular ELF backend linker to do all the work. */
12741 return bfd_elf_final_link (abfd, info);
12745 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12747 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12749 if (rcookie->bad_symtab)
12750 rcookie->rel = rcookie->rels;
12752 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12754 unsigned long r_symndx;
12756 if (! rcookie->bad_symtab)
12757 if (rcookie->rel->r_offset > offset)
12759 if (rcookie->rel->r_offset != offset)
12762 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12763 if (r_symndx == STN_UNDEF)
12766 if (r_symndx >= rcookie->locsymcount
12767 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12769 struct elf_link_hash_entry *h;
12771 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12773 while (h->root.type == bfd_link_hash_indirect
12774 || h->root.type == bfd_link_hash_warning)
12775 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12777 if ((h->root.type == bfd_link_hash_defined
12778 || h->root.type == bfd_link_hash_defweak)
12779 && (h->root.u.def.section->owner != rcookie->abfd
12780 || h->root.u.def.section->kept_section != NULL
12781 || discarded_section (h->root.u.def.section)))
12786 /* It's not a relocation against a global symbol,
12787 but it could be a relocation against a local
12788 symbol for a discarded section. */
12790 Elf_Internal_Sym *isym;
12792 /* Need to: get the symbol; get the section. */
12793 isym = &rcookie->locsyms[r_symndx];
12794 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12796 && (isec->kept_section != NULL
12797 || discarded_section (isec)))
12805 /* Discard unneeded references to discarded sections.
12806 Returns -1 on error, 1 if any section's size was changed, 0 if
12807 nothing changed. This function assumes that the relocations are in
12808 sorted order, which is true for all known assemblers. */
12811 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12813 struct elf_reloc_cookie cookie;
12818 if (info->traditional_format
12819 || !is_elf_hash_table (info->hash))
12822 o = bfd_get_section_by_name (output_bfd, ".stab");
12827 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12830 || i->reloc_count == 0
12831 || i->sec_info_type != SEC_INFO_TYPE_STABS)
12835 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12838 if (!init_reloc_cookie_for_section (&cookie, info, i))
12841 if (_bfd_discard_section_stabs (abfd, i,
12842 elf_section_data (i)->sec_info,
12843 bfd_elf_reloc_symbol_deleted_p,
12847 fini_reloc_cookie_for_section (&cookie, i);
12851 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
12856 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12862 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12865 if (!init_reloc_cookie_for_section (&cookie, info, i))
12868 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
12869 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
12870 bfd_elf_reloc_symbol_deleted_p,
12874 fini_reloc_cookie_for_section (&cookie, i);
12878 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
12880 const struct elf_backend_data *bed;
12882 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12885 bed = get_elf_backend_data (abfd);
12887 if (bed->elf_backend_discard_info != NULL)
12889 if (!init_reloc_cookie (&cookie, info, abfd))
12892 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
12895 fini_reloc_cookie (&cookie, abfd);
12899 if (info->eh_frame_hdr
12900 && !info->relocatable
12901 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12908 _bfd_elf_section_already_linked (bfd *abfd,
12910 struct bfd_link_info *info)
12913 const char *name, *key;
12914 struct bfd_section_already_linked *l;
12915 struct bfd_section_already_linked_hash_entry *already_linked_list;
12917 if (sec->output_section == bfd_abs_section_ptr)
12920 flags = sec->flags;
12922 /* Return if it isn't a linkonce section. A comdat group section
12923 also has SEC_LINK_ONCE set. */
12924 if ((flags & SEC_LINK_ONCE) == 0)
12927 /* Don't put group member sections on our list of already linked
12928 sections. They are handled as a group via their group section. */
12929 if (elf_sec_group (sec) != NULL)
12932 /* For a SHT_GROUP section, use the group signature as the key. */
12934 if ((flags & SEC_GROUP) != 0
12935 && elf_next_in_group (sec) != NULL
12936 && elf_group_name (elf_next_in_group (sec)) != NULL)
12937 key = elf_group_name (elf_next_in_group (sec));
12940 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
12941 if (CONST_STRNEQ (name, ".gnu.linkonce.")
12942 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
12945 /* Must be a user linkonce section that doesn't follow gcc's
12946 naming convention. In this case we won't be matching
12947 single member groups. */
12951 already_linked_list = bfd_section_already_linked_table_lookup (key);
12953 for (l = already_linked_list->entry; l != NULL; l = l->next)
12955 /* We may have 2 different types of sections on the list: group
12956 sections with a signature of <key> (<key> is some string),
12957 and linkonce sections named .gnu.linkonce.<type>.<key>.
12958 Match like sections. LTO plugin sections are an exception.
12959 They are always named .gnu.linkonce.t.<key> and match either
12960 type of section. */
12961 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
12962 && ((flags & SEC_GROUP) != 0
12963 || strcmp (name, l->sec->name) == 0))
12964 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
12966 /* The section has already been linked. See if we should
12967 issue a warning. */
12968 if (!_bfd_handle_already_linked (sec, l, info))
12971 if (flags & SEC_GROUP)
12973 asection *first = elf_next_in_group (sec);
12974 asection *s = first;
12978 s->output_section = bfd_abs_section_ptr;
12979 /* Record which group discards it. */
12980 s->kept_section = l->sec;
12981 s = elf_next_in_group (s);
12982 /* These lists are circular. */
12992 /* A single member comdat group section may be discarded by a
12993 linkonce section and vice versa. */
12994 if ((flags & SEC_GROUP) != 0)
12996 asection *first = elf_next_in_group (sec);
12998 if (first != NULL && elf_next_in_group (first) == first)
12999 /* Check this single member group against linkonce sections. */
13000 for (l = already_linked_list->entry; l != NULL; l = l->next)
13001 if ((l->sec->flags & SEC_GROUP) == 0
13002 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
13004 first->output_section = bfd_abs_section_ptr;
13005 first->kept_section = l->sec;
13006 sec->output_section = bfd_abs_section_ptr;
13011 /* Check this linkonce section against single member groups. */
13012 for (l = already_linked_list->entry; l != NULL; l = l->next)
13013 if (l->sec->flags & SEC_GROUP)
13015 asection *first = elf_next_in_group (l->sec);
13018 && elf_next_in_group (first) == first
13019 && bfd_elf_match_symbols_in_sections (first, sec, info))
13021 sec->output_section = bfd_abs_section_ptr;
13022 sec->kept_section = first;
13027 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
13028 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
13029 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
13030 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
13031 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
13032 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
13033 `.gnu.linkonce.t.F' section from a different bfd not requiring any
13034 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
13035 The reverse order cannot happen as there is never a bfd with only the
13036 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
13037 matter as here were are looking only for cross-bfd sections. */
13039 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
13040 for (l = already_linked_list->entry; l != NULL; l = l->next)
13041 if ((l->sec->flags & SEC_GROUP) == 0
13042 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
13044 if (abfd != l->sec->owner)
13045 sec->output_section = bfd_abs_section_ptr;
13049 /* This is the first section with this name. Record it. */
13050 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
13051 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
13052 return sec->output_section == bfd_abs_section_ptr;
13056 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
13058 return sym->st_shndx == SHN_COMMON;
13062 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
13068 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
13070 return bfd_com_section_ptr;
13074 _bfd_elf_default_got_elt_size (bfd *abfd,
13075 struct bfd_link_info *info ATTRIBUTE_UNUSED,
13076 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
13077 bfd *ibfd ATTRIBUTE_UNUSED,
13078 unsigned long symndx ATTRIBUTE_UNUSED)
13080 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13081 return bed->s->arch_size / 8;
13084 /* Routines to support the creation of dynamic relocs. */
13086 /* Returns the name of the dynamic reloc section associated with SEC. */
13088 static const char *
13089 get_dynamic_reloc_section_name (bfd * abfd,
13091 bfd_boolean is_rela)
13094 const char *old_name = bfd_get_section_name (NULL, sec);
13095 const char *prefix = is_rela ? ".rela" : ".rel";
13097 if (old_name == NULL)
13100 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
13101 sprintf (name, "%s%s", prefix, old_name);
13106 /* Returns the dynamic reloc section associated with SEC.
13107 If necessary compute the name of the dynamic reloc section based
13108 on SEC's name (looked up in ABFD's string table) and the setting
13112 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
13114 bfd_boolean is_rela)
13116 asection * reloc_sec = elf_section_data (sec)->sreloc;
13118 if (reloc_sec == NULL)
13120 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13124 reloc_sec = bfd_get_linker_section (abfd, name);
13126 if (reloc_sec != NULL)
13127 elf_section_data (sec)->sreloc = reloc_sec;
13134 /* Returns the dynamic reloc section associated with SEC. If the
13135 section does not exist it is created and attached to the DYNOBJ
13136 bfd and stored in the SRELOC field of SEC's elf_section_data
13139 ALIGNMENT is the alignment for the newly created section and
13140 IS_RELA defines whether the name should be .rela.<SEC's name>
13141 or .rel.<SEC's name>. The section name is looked up in the
13142 string table associated with ABFD. */
13145 _bfd_elf_make_dynamic_reloc_section (asection * sec,
13147 unsigned int alignment,
13149 bfd_boolean is_rela)
13151 asection * reloc_sec = elf_section_data (sec)->sreloc;
13153 if (reloc_sec == NULL)
13155 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13160 reloc_sec = bfd_get_linker_section (dynobj, name);
13162 if (reloc_sec == NULL)
13164 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
13165 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
13166 if ((sec->flags & SEC_ALLOC) != 0)
13167 flags |= SEC_ALLOC | SEC_LOAD;
13169 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13170 if (reloc_sec != NULL)
13172 /* _bfd_elf_get_sec_type_attr chooses a section type by
13173 name. Override as it may be wrong, eg. for a user
13174 section named "auto" we'll get ".relauto" which is
13175 seen to be a .rela section. */
13176 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13177 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13182 elf_section_data (sec)->sreloc = reloc_sec;
13188 /* Copy the ELF symbol type and other attributes for a linker script
13189 assignment from HSRC to HDEST. Generally this should be treated as
13190 if we found a strong non-dynamic definition for HDEST (except that
13191 ld ignores multiple definition errors). */
13193 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13194 struct bfd_link_hash_entry *hdest,
13195 struct bfd_link_hash_entry *hsrc)
13197 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13198 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13199 Elf_Internal_Sym isym;
13201 ehdest->type = ehsrc->type;
13202 ehdest->target_internal = ehsrc->target_internal;
13204 isym.st_other = ehsrc->other;
13205 elf_merge_st_other (abfd, ehdest, &isym, NULL, TRUE, FALSE);
13208 /* Append a RELA relocation REL to section S in BFD. */
13211 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13213 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13214 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13215 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13216 bed->s->swap_reloca_out (abfd, rel, loc);
13219 /* Append a REL relocation REL to section S in BFD. */
13222 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13224 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13225 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13226 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13227 bed->s->swap_reloc_out (abfd, rel, loc);