1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
29 #include "safe-ctype.h"
30 #include "libiberty.h"
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
38 struct bfd_link_info *info;
39 struct bfd_elf_version_tree *verdefs;
43 /* This structure is used to pass information to
44 _bfd_elf_link_find_version_dependencies. */
46 struct elf_find_verdep_info
48 /* General link information. */
49 struct bfd_link_info *info;
50 /* The number of dependencies. */
52 /* Whether we had a failure. */
56 static bfd_boolean _bfd_elf_fix_symbol_flags
57 (struct elf_link_hash_entry *, struct elf_info_failed *);
59 /* Define a symbol in a dynamic linkage section. */
61 struct elf_link_hash_entry *
62 _bfd_elf_define_linkage_sym (bfd *abfd,
63 struct bfd_link_info *info,
67 struct elf_link_hash_entry *h;
68 struct bfd_link_hash_entry *bh;
69 const struct elf_backend_data *bed;
71 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
74 /* Zap symbol defined in an as-needed lib that wasn't linked.
75 This is a symptom of a larger problem: Absolute symbols
76 defined in shared libraries can't be overridden, because we
77 lose the link to the bfd which is via the symbol section. */
78 h->root.type = bfd_link_hash_new;
82 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
84 get_elf_backend_data (abfd)->collect,
87 h = (struct elf_link_hash_entry *) bh;
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_section_by_name (abfd, ".got");
109 if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0)
112 flags = bed->dynamic_sec_flags;
114 s = bfd_make_section_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_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_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;
192 if (! is_elf_hash_table (info->hash))
195 if (elf_hash_table (info)->dynamic_sections_created)
198 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
201 abfd = elf_hash_table (info)->dynobj;
202 bed = get_elf_backend_data (abfd);
204 flags = bed->dynamic_sec_flags;
206 /* A dynamically linked executable has a .interp section, but a
207 shared library does not. */
208 if (info->executable)
210 s = bfd_make_section_with_flags (abfd, ".interp",
211 flags | SEC_READONLY);
216 /* Create sections to hold version informations. These are removed
217 if they are not needed. */
218 s = bfd_make_section_with_flags (abfd, ".gnu.version_d",
219 flags | SEC_READONLY);
221 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
224 s = bfd_make_section_with_flags (abfd, ".gnu.version",
225 flags | SEC_READONLY);
227 || ! bfd_set_section_alignment (abfd, s, 1))
230 s = bfd_make_section_with_flags (abfd, ".gnu.version_r",
231 flags | SEC_READONLY);
233 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
236 s = bfd_make_section_with_flags (abfd, ".dynsym",
237 flags | SEC_READONLY);
239 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
242 s = bfd_make_section_with_flags (abfd, ".dynstr",
243 flags | SEC_READONLY);
247 s = bfd_make_section_with_flags (abfd, ".dynamic", flags);
249 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
252 /* The special symbol _DYNAMIC is always set to the start of the
253 .dynamic section. We could set _DYNAMIC in a linker script, but we
254 only want to define it if we are, in fact, creating a .dynamic
255 section. We don't want to define it if there is no .dynamic
256 section, since on some ELF platforms the start up code examines it
257 to decide how to initialize the process. */
258 if (!_bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC"))
263 s = bfd_make_section_with_flags (abfd, ".hash", flags | SEC_READONLY);
265 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
267 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
270 if (info->emit_gnu_hash)
272 s = bfd_make_section_with_flags (abfd, ".gnu.hash",
273 flags | SEC_READONLY);
275 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
277 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
278 4 32-bit words followed by variable count of 64-bit words, then
279 variable count of 32-bit words. */
280 if (bed->s->arch_size == 64)
281 elf_section_data (s)->this_hdr.sh_entsize = 0;
283 elf_section_data (s)->this_hdr.sh_entsize = 4;
286 /* Let the backend create the rest of the sections. This lets the
287 backend set the right flags. The backend will normally create
288 the .got and .plt sections. */
289 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
292 elf_hash_table (info)->dynamic_sections_created = TRUE;
297 /* Create dynamic sections when linking against a dynamic object. */
300 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
302 flagword flags, pltflags;
303 struct elf_link_hash_entry *h;
305 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
306 struct elf_link_hash_table *htab = elf_hash_table (info);
308 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
309 .rel[a].bss sections. */
310 flags = bed->dynamic_sec_flags;
313 if (bed->plt_not_loaded)
314 /* We do not clear SEC_ALLOC here because we still want the OS to
315 allocate space for the section; it's just that there's nothing
316 to read in from the object file. */
317 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
319 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
320 if (bed->plt_readonly)
321 pltflags |= SEC_READONLY;
323 s = bfd_make_section_with_flags (abfd, ".plt", pltflags);
325 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
329 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
331 if (bed->want_plt_sym)
333 h = _bfd_elf_define_linkage_sym (abfd, info, s,
334 "_PROCEDURE_LINKAGE_TABLE_");
335 elf_hash_table (info)->hplt = h;
340 s = bfd_make_section_with_flags (abfd,
341 (bed->rela_plts_and_copies_p
342 ? ".rela.plt" : ".rel.plt"),
343 flags | SEC_READONLY);
345 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
349 if (! _bfd_elf_create_got_section (abfd, info))
352 if (bed->want_dynbss)
354 /* The .dynbss section is a place to put symbols which are defined
355 by dynamic objects, are referenced by regular objects, and are
356 not functions. We must allocate space for them in the process
357 image and use a R_*_COPY reloc to tell the dynamic linker to
358 initialize them at run time. The linker script puts the .dynbss
359 section into the .bss section of the final image. */
360 s = bfd_make_section_with_flags (abfd, ".dynbss",
362 | SEC_LINKER_CREATED));
366 /* The .rel[a].bss section holds copy relocs. This section is not
367 normally needed. We need to create it here, though, so that the
368 linker will map it to an output section. We can't just create it
369 only if we need it, because we will not know whether we need it
370 until we have seen all the input files, and the first time the
371 main linker code calls BFD after examining all the input files
372 (size_dynamic_sections) the input sections have already been
373 mapped to the output sections. If the section turns out not to
374 be needed, we can discard it later. We will never need this
375 section when generating a shared object, since they do not use
379 s = bfd_make_section_with_flags (abfd,
380 (bed->rela_plts_and_copies_p
381 ? ".rela.bss" : ".rel.bss"),
382 flags | SEC_READONLY);
384 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
392 /* Record a new dynamic symbol. We record the dynamic symbols as we
393 read the input files, since we need to have a list of all of them
394 before we can determine the final sizes of the output sections.
395 Note that we may actually call this function even though we are not
396 going to output any dynamic symbols; in some cases we know that a
397 symbol should be in the dynamic symbol table, but only if there is
401 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
402 struct elf_link_hash_entry *h)
404 if (h->dynindx == -1)
406 struct elf_strtab_hash *dynstr;
411 /* XXX: The ABI draft says the linker must turn hidden and
412 internal symbols into STB_LOCAL symbols when producing the
413 DSO. However, if ld.so honors st_other in the dynamic table,
414 this would not be necessary. */
415 switch (ELF_ST_VISIBILITY (h->other))
419 if (h->root.type != bfd_link_hash_undefined
420 && h->root.type != bfd_link_hash_undefweak)
423 if (!elf_hash_table (info)->is_relocatable_executable)
431 h->dynindx = elf_hash_table (info)->dynsymcount;
432 ++elf_hash_table (info)->dynsymcount;
434 dynstr = elf_hash_table (info)->dynstr;
437 /* Create a strtab to hold the dynamic symbol names. */
438 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
443 /* We don't put any version information in the dynamic string
445 name = h->root.root.string;
446 p = strchr (name, ELF_VER_CHR);
448 /* We know that the p points into writable memory. In fact,
449 there are only a few symbols that have read-only names, being
450 those like _GLOBAL_OFFSET_TABLE_ that are created specially
451 by the backends. Most symbols will have names pointing into
452 an ELF string table read from a file, or to objalloc memory. */
455 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
460 if (indx == (bfd_size_type) -1)
462 h->dynstr_index = indx;
468 /* Mark a symbol dynamic. */
471 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
472 struct elf_link_hash_entry *h,
473 Elf_Internal_Sym *sym)
475 struct bfd_elf_dynamic_list *d = info->dynamic_list;
477 /* It may be called more than once on the same H. */
478 if(h->dynamic || info->relocatable)
481 if ((info->dynamic_data
482 && (h->type == STT_OBJECT
484 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
486 && h->root.type == bfd_link_hash_new
487 && (*d->match) (&d->head, NULL, h->root.root.string)))
491 /* Record an assignment to a symbol made by a linker script. We need
492 this in case some dynamic object refers to this symbol. */
495 bfd_elf_record_link_assignment (bfd *output_bfd,
496 struct bfd_link_info *info,
501 struct elf_link_hash_entry *h, *hv;
502 struct elf_link_hash_table *htab;
503 const struct elf_backend_data *bed;
505 if (!is_elf_hash_table (info->hash))
508 htab = elf_hash_table (info);
509 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
513 switch (h->root.type)
515 case bfd_link_hash_defined:
516 case bfd_link_hash_defweak:
517 case bfd_link_hash_common:
519 case bfd_link_hash_undefweak:
520 case bfd_link_hash_undefined:
521 /* Since we're defining the symbol, don't let it seem to have not
522 been defined. record_dynamic_symbol and size_dynamic_sections
523 may depend on this. */
524 h->root.type = bfd_link_hash_new;
525 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
526 bfd_link_repair_undef_list (&htab->root);
528 case bfd_link_hash_new:
529 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
532 case bfd_link_hash_indirect:
533 /* We had a versioned symbol in a dynamic library. We make the
534 the versioned symbol point to this one. */
535 bed = get_elf_backend_data (output_bfd);
537 while (hv->root.type == bfd_link_hash_indirect
538 || hv->root.type == bfd_link_hash_warning)
539 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
540 /* We don't need to update h->root.u since linker will set them
542 h->root.type = bfd_link_hash_undefined;
543 hv->root.type = bfd_link_hash_indirect;
544 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
545 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
547 case bfd_link_hash_warning:
552 /* If this symbol is being provided by the linker script, and it is
553 currently defined by a dynamic object, but not by a regular
554 object, then mark it as undefined so that the generic linker will
555 force the correct value. */
559 h->root.type = bfd_link_hash_undefined;
561 /* If this symbol is not being provided by the linker script, and it is
562 currently defined by a dynamic object, but not by a regular object,
563 then clear out any version information because the symbol will not be
564 associated with the dynamic object any more. */
568 h->verinfo.verdef = NULL;
572 if (provide && hidden)
574 bed = get_elf_backend_data (output_bfd);
575 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
576 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
579 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
581 if (!info->relocatable
583 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
584 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
590 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
593 if (! bfd_elf_link_record_dynamic_symbol (info, h))
596 /* If this is a weak defined symbol, and we know a corresponding
597 real symbol from the same dynamic object, make sure the real
598 symbol is also made into a dynamic symbol. */
599 if (h->u.weakdef != NULL
600 && h->u.weakdef->dynindx == -1)
602 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
610 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
611 success, and 2 on a failure caused by attempting to record a symbol
612 in a discarded section, eg. a discarded link-once section symbol. */
615 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
620 struct elf_link_local_dynamic_entry *entry;
621 struct elf_link_hash_table *eht;
622 struct elf_strtab_hash *dynstr;
623 unsigned long dynstr_index;
625 Elf_External_Sym_Shndx eshndx;
626 char esym[sizeof (Elf64_External_Sym)];
628 if (! is_elf_hash_table (info->hash))
631 /* See if the entry exists already. */
632 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
633 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
636 amt = sizeof (*entry);
637 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
641 /* Go find the symbol, so that we can find it's name. */
642 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
643 1, input_indx, &entry->isym, esym, &eshndx))
645 bfd_release (input_bfd, entry);
649 if (entry->isym.st_shndx != SHN_UNDEF
650 && entry->isym.st_shndx < SHN_LORESERVE)
654 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
655 if (s == NULL || bfd_is_abs_section (s->output_section))
657 /* We can still bfd_release here as nothing has done another
658 bfd_alloc. We can't do this later in this function. */
659 bfd_release (input_bfd, entry);
664 name = (bfd_elf_string_from_elf_section
665 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
666 entry->isym.st_name));
668 dynstr = elf_hash_table (info)->dynstr;
671 /* Create a strtab to hold the dynamic symbol names. */
672 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
677 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
678 if (dynstr_index == (unsigned long) -1)
680 entry->isym.st_name = dynstr_index;
682 eht = elf_hash_table (info);
684 entry->next = eht->dynlocal;
685 eht->dynlocal = entry;
686 entry->input_bfd = input_bfd;
687 entry->input_indx = input_indx;
690 /* Whatever binding the symbol had before, it's now local. */
692 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
694 /* The dynindx will be set at the end of size_dynamic_sections. */
699 /* Return the dynindex of a local dynamic symbol. */
702 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
706 struct elf_link_local_dynamic_entry *e;
708 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
709 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
714 /* This function is used to renumber the dynamic symbols, if some of
715 them are removed because they are marked as local. This is called
716 via elf_link_hash_traverse. */
719 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
722 size_t *count = (size_t *) data;
724 if (h->root.type == bfd_link_hash_warning)
725 h = (struct elf_link_hash_entry *) h->root.u.i.link;
730 if (h->dynindx != -1)
731 h->dynindx = ++(*count);
737 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
738 STB_LOCAL binding. */
741 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
744 size_t *count = (size_t *) data;
746 if (h->root.type == bfd_link_hash_warning)
747 h = (struct elf_link_hash_entry *) h->root.u.i.link;
749 if (!h->forced_local)
752 if (h->dynindx != -1)
753 h->dynindx = ++(*count);
758 /* Return true if the dynamic symbol for a given section should be
759 omitted when creating a shared library. */
761 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
762 struct bfd_link_info *info,
765 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 if (strcmp (p->name, ".got") == 0
782 || strcmp (p->name, ".got.plt") == 0
783 || strcmp (p->name, ".plt") == 0)
787 if (htab->dynobj != NULL
788 && (ip = bfd_get_section_by_name (htab->dynobj, p->name)) != NULL
789 && (ip->flags & SEC_LINKER_CREATED)
790 && ip->output_section == p)
795 /* There shouldn't be section relative relocations
796 against any other section. */
802 /* Assign dynsym indices. In a shared library we generate a section
803 symbol for each output section, which come first. Next come symbols
804 which have been forced to local binding. Then all of the back-end
805 allocated local dynamic syms, followed by the rest of the global
809 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
810 struct bfd_link_info *info,
811 unsigned long *section_sym_count)
813 unsigned long dynsymcount = 0;
815 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
817 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
819 for (p = output_bfd->sections; p ; p = p->next)
820 if ((p->flags & SEC_EXCLUDE) == 0
821 && (p->flags & SEC_ALLOC) != 0
822 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
823 elf_section_data (p)->dynindx = ++dynsymcount;
825 elf_section_data (p)->dynindx = 0;
827 *section_sym_count = dynsymcount;
829 elf_link_hash_traverse (elf_hash_table (info),
830 elf_link_renumber_local_hash_table_dynsyms,
833 if (elf_hash_table (info)->dynlocal)
835 struct elf_link_local_dynamic_entry *p;
836 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
837 p->dynindx = ++dynsymcount;
840 elf_link_hash_traverse (elf_hash_table (info),
841 elf_link_renumber_hash_table_dynsyms,
844 /* There is an unused NULL entry at the head of the table which
845 we must account for in our count. Unless there weren't any
846 symbols, which means we'll have no table at all. */
847 if (dynsymcount != 0)
850 elf_hash_table (info)->dynsymcount = dynsymcount;
854 /* Merge st_other field. */
857 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
858 Elf_Internal_Sym *isym, bfd_boolean definition,
861 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
863 /* If st_other has a processor-specific meaning, specific
864 code might be needed here. We never merge the visibility
865 attribute with the one from a dynamic object. */
866 if (bed->elf_backend_merge_symbol_attribute)
867 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
870 /* If this symbol has default visibility and the user has requested
871 we not re-export it, then mark it as hidden. */
875 || (abfd->my_archive && abfd->my_archive->no_export))
876 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
877 isym->st_other = (STV_HIDDEN
878 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
880 if (!dynamic && ELF_ST_VISIBILITY (isym->st_other) != 0)
882 unsigned char hvis, symvis, other, nvis;
884 /* Only merge the visibility. Leave the remainder of the
885 st_other field to elf_backend_merge_symbol_attribute. */
886 other = h->other & ~ELF_ST_VISIBILITY (-1);
888 /* Combine visibilities, using the most constraining one. */
889 hvis = ELF_ST_VISIBILITY (h->other);
890 symvis = ELF_ST_VISIBILITY (isym->st_other);
896 nvis = hvis < symvis ? hvis : symvis;
898 h->other = other | nvis;
902 /* This function is called when we want to define a new symbol. It
903 handles the various cases which arise when we find a definition in
904 a dynamic object, or when there is already a definition in a
905 dynamic object. The new symbol is described by NAME, SYM, PSEC,
906 and PVALUE. We set SYM_HASH to the hash table entry. We set
907 OVERRIDE if the old symbol is overriding a new definition. We set
908 TYPE_CHANGE_OK if it is OK for the type to change. We set
909 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
910 change, we mean that we shouldn't warn if the type or size does
911 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
912 object is overridden by a regular object. */
915 _bfd_elf_merge_symbol (bfd *abfd,
916 struct bfd_link_info *info,
918 Elf_Internal_Sym *sym,
921 unsigned int *pold_alignment,
922 struct elf_link_hash_entry **sym_hash,
924 bfd_boolean *override,
925 bfd_boolean *type_change_ok,
926 bfd_boolean *size_change_ok)
928 asection *sec, *oldsec;
929 struct elf_link_hash_entry *h;
930 struct elf_link_hash_entry *flip;
933 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
934 bfd_boolean newweak, oldweak, newfunc, oldfunc;
935 const struct elf_backend_data *bed;
941 bind = ELF_ST_BIND (sym->st_info);
943 /* Silently discard TLS symbols from --just-syms. There's no way to
944 combine a static TLS block with a new TLS block for this executable. */
945 if (ELF_ST_TYPE (sym->st_info) == STT_TLS
946 && sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
952 if (! bfd_is_und_section (sec))
953 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
955 h = ((struct elf_link_hash_entry *)
956 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
961 bed = get_elf_backend_data (abfd);
963 /* This code is for coping with dynamic objects, and is only useful
964 if we are doing an ELF link. */
965 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
968 /* For merging, we only care about real symbols. */
970 while (h->root.type == bfd_link_hash_indirect
971 || h->root.type == bfd_link_hash_warning)
972 h = (struct elf_link_hash_entry *) h->root.u.i.link;
974 /* We have to check it for every instance since the first few may be
975 refereences and not all compilers emit symbol type for undefined
977 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
979 /* If we just created the symbol, mark it as being an ELF symbol.
980 Other than that, there is nothing to do--there is no merge issue
981 with a newly defined symbol--so we just return. */
983 if (h->root.type == bfd_link_hash_new)
989 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
992 switch (h->root.type)
999 case bfd_link_hash_undefined:
1000 case bfd_link_hash_undefweak:
1001 oldbfd = h->root.u.undef.abfd;
1005 case bfd_link_hash_defined:
1006 case bfd_link_hash_defweak:
1007 oldbfd = h->root.u.def.section->owner;
1008 oldsec = h->root.u.def.section;
1011 case bfd_link_hash_common:
1012 oldbfd = h->root.u.c.p->section->owner;
1013 oldsec = h->root.u.c.p->section;
1017 /* Differentiate strong and weak symbols. */
1018 newweak = bind == STB_WEAK;
1019 oldweak = (h->root.type == bfd_link_hash_defweak
1020 || h->root.type == bfd_link_hash_undefweak);
1022 /* In cases involving weak versioned symbols, we may wind up trying
1023 to merge a symbol with itself. Catch that here, to avoid the
1024 confusion that results if we try to override a symbol with
1025 itself. The additional tests catch cases like
1026 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1027 dynamic object, which we do want to handle here. */
1029 && (newweak || oldweak)
1030 && ((abfd->flags & DYNAMIC) == 0
1031 || !h->def_regular))
1034 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1035 respectively, is from a dynamic object. */
1037 newdyn = (abfd->flags & DYNAMIC) != 0;
1041 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1042 else if (oldsec != NULL)
1044 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1045 indices used by MIPS ELF. */
1046 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1049 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1050 respectively, appear to be a definition rather than reference. */
1052 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1054 olddef = (h->root.type != bfd_link_hash_undefined
1055 && h->root.type != bfd_link_hash_undefweak
1056 && h->root.type != bfd_link_hash_common);
1058 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1059 respectively, appear to be a function. */
1061 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1062 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1064 oldfunc = (h->type != STT_NOTYPE
1065 && bed->is_function_type (h->type));
1067 /* When we try to create a default indirect symbol from the dynamic
1068 definition with the default version, we skip it if its type and
1069 the type of existing regular definition mismatch. We only do it
1070 if the existing regular definition won't be dynamic. */
1071 if (pold_alignment == NULL
1073 && !info->export_dynamic
1078 && (olddef || h->root.type == bfd_link_hash_common)
1079 && ELF_ST_TYPE (sym->st_info) != h->type
1080 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1081 && h->type != STT_NOTYPE
1082 && !(newfunc && oldfunc))
1088 /* Plugin symbol type isn't currently set. Stop bogus errors. */
1089 if (oldbfd != NULL && (oldbfd->flags & BFD_PLUGIN) != 0)
1090 *type_change_ok = TRUE;
1092 /* Check TLS symbol. We don't check undefined symbol introduced by
1094 else if (oldbfd != NULL
1095 && ELF_ST_TYPE (sym->st_info) != h->type
1096 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1099 bfd_boolean ntdef, tdef;
1100 asection *ntsec, *tsec;
1102 if (h->type == STT_TLS)
1122 (*_bfd_error_handler)
1123 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1124 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1125 else if (!tdef && !ntdef)
1126 (*_bfd_error_handler)
1127 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1128 tbfd, ntbfd, h->root.root.string);
1130 (*_bfd_error_handler)
1131 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1132 tbfd, tsec, ntbfd, h->root.root.string);
1134 (*_bfd_error_handler)
1135 (_("%s: TLS reference in %B 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 /* We need to remember if a symbol has a definition in a dynamic
1143 object or is weak in all dynamic objects. Internal and hidden
1144 visibility will make it unavailable to dynamic objects. */
1145 if (newdyn && !h->dynamic_def)
1147 if (!bfd_is_und_section (sec))
1151 /* Check if this symbol is weak in all dynamic objects. If it
1152 is the first time we see it in a dynamic object, we mark
1153 if it is weak. Otherwise, we clear it. */
1154 if (!h->ref_dynamic)
1156 if (bind == STB_WEAK)
1157 h->dynamic_weak = 1;
1159 else if (bind != STB_WEAK)
1160 h->dynamic_weak = 0;
1164 /* If the old symbol has non-default visibility, we ignore the new
1165 definition from a dynamic object. */
1167 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1168 && !bfd_is_und_section (sec))
1171 /* Make sure this symbol is dynamic. */
1173 /* A protected symbol has external availability. Make sure it is
1174 recorded as dynamic.
1176 FIXME: Should we check type and size for protected symbol? */
1177 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1178 return bfd_elf_link_record_dynamic_symbol (info, h);
1183 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1186 /* If the new symbol with non-default visibility comes from a
1187 relocatable file and the old definition comes from a dynamic
1188 object, we remove the old definition. */
1189 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1191 /* Handle the case where the old dynamic definition is
1192 default versioned. We need to copy the symbol info from
1193 the symbol with default version to the normal one if it
1194 was referenced before. */
1197 struct elf_link_hash_entry *vh = *sym_hash;
1199 vh->root.type = h->root.type;
1200 h->root.type = bfd_link_hash_indirect;
1201 (*bed->elf_backend_copy_indirect_symbol) (info, vh, h);
1202 /* Protected symbols will override the dynamic definition
1203 with default version. */
1204 if (ELF_ST_VISIBILITY (sym->st_other) == STV_PROTECTED)
1206 h->root.u.i.link = (struct bfd_link_hash_entry *) vh;
1207 vh->dynamic_def = 1;
1208 vh->ref_dynamic = 1;
1212 h->root.type = vh->root.type;
1213 vh->ref_dynamic = 0;
1214 /* We have to hide it here since it was made dynamic
1215 global with extra bits when the symbol info was
1216 copied from the old dynamic definition. */
1217 (*bed->elf_backend_hide_symbol) (info, vh, TRUE);
1225 if ((h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1226 && bfd_is_und_section (sec))
1228 /* If the new symbol is undefined and the old symbol was
1229 also undefined before, we need to make sure
1230 _bfd_generic_link_add_one_symbol doesn't mess
1231 up the linker hash table undefs list. Since the old
1232 definition came from a dynamic object, it is still on the
1234 h->root.type = bfd_link_hash_undefined;
1235 h->root.u.undef.abfd = abfd;
1239 h->root.type = bfd_link_hash_new;
1240 h->root.u.undef.abfd = NULL;
1249 /* FIXME: Should we check type and size for protected symbol? */
1255 if (bind == STB_GNU_UNIQUE)
1256 h->unique_global = 1;
1258 /* If a new weak symbol definition comes from a regular file and the
1259 old symbol comes from a dynamic library, we treat the new one as
1260 strong. Similarly, an old weak symbol definition from a regular
1261 file is treated as strong when the new symbol comes from a dynamic
1262 library. Further, an old weak symbol from a dynamic library is
1263 treated as strong if the new symbol is from a dynamic library.
1264 This reflects the way glibc's ld.so works.
1266 Do this before setting *type_change_ok or *size_change_ok so that
1267 we warn properly when dynamic library symbols are overridden. */
1269 if (newdef && !newdyn && olddyn)
1271 if (olddef && newdyn)
1274 /* Allow changes between different types of function symbol. */
1275 if (newfunc && oldfunc)
1276 *type_change_ok = TRUE;
1278 /* It's OK to change the type if either the existing symbol or the
1279 new symbol is weak. A type change is also OK if the old symbol
1280 is undefined and the new symbol is defined. */
1285 && h->root.type == bfd_link_hash_undefined))
1286 *type_change_ok = TRUE;
1288 /* It's OK to change the size if either the existing symbol or the
1289 new symbol is weak, or if the old symbol is undefined. */
1292 || h->root.type == bfd_link_hash_undefined)
1293 *size_change_ok = TRUE;
1295 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1296 symbol, respectively, appears to be a common symbol in a dynamic
1297 object. If a symbol appears in an uninitialized section, and is
1298 not weak, and is not a function, then it may be a common symbol
1299 which was resolved when the dynamic object was created. We want
1300 to treat such symbols specially, because they raise special
1301 considerations when setting the symbol size: if the symbol
1302 appears as a common symbol in a regular object, and the size in
1303 the regular object is larger, we must make sure that we use the
1304 larger size. This problematic case can always be avoided in C,
1305 but it must be handled correctly when using Fortran shared
1308 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1309 likewise for OLDDYNCOMMON and OLDDEF.
1311 Note that this test is just a heuristic, and that it is quite
1312 possible to have an uninitialized symbol in a shared object which
1313 is really a definition, rather than a common symbol. This could
1314 lead to some minor confusion when the symbol really is a common
1315 symbol in some regular object. However, I think it will be
1321 && (sec->flags & SEC_ALLOC) != 0
1322 && (sec->flags & SEC_LOAD) == 0
1325 newdyncommon = TRUE;
1327 newdyncommon = FALSE;
1331 && h->root.type == bfd_link_hash_defined
1333 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1334 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1337 olddyncommon = TRUE;
1339 olddyncommon = FALSE;
1341 /* We now know everything about the old and new symbols. We ask the
1342 backend to check if we can merge them. */
1343 if (bed->merge_symbol
1344 && !bed->merge_symbol (info, sym_hash, h, sym, psec, pvalue,
1345 pold_alignment, skip, override,
1346 type_change_ok, size_change_ok,
1347 &newdyn, &newdef, &newdyncommon, &newweak,
1349 &olddyn, &olddef, &olddyncommon, &oldweak,
1353 /* If both the old and the new symbols look like common symbols in a
1354 dynamic object, set the size of the symbol to the larger of the
1359 && sym->st_size != h->size)
1361 /* Since we think we have two common symbols, issue a multiple
1362 common warning if desired. Note that we only warn if the
1363 size is different. If the size is the same, we simply let
1364 the old symbol override the new one as normally happens with
1365 symbols defined in dynamic objects. */
1367 if (! ((*info->callbacks->multiple_common)
1368 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1371 if (sym->st_size > h->size)
1372 h->size = sym->st_size;
1374 *size_change_ok = TRUE;
1377 /* If we are looking at a dynamic object, and we have found a
1378 definition, we need to see if the symbol was already defined by
1379 some other object. If so, we want to use the existing
1380 definition, and we do not want to report a multiple symbol
1381 definition error; we do this by clobbering *PSEC to be
1382 bfd_und_section_ptr.
1384 We treat a common symbol as a definition if the symbol in the
1385 shared library is a function, since common symbols always
1386 represent variables; this can cause confusion in principle, but
1387 any such confusion would seem to indicate an erroneous program or
1388 shared library. We also permit a common symbol in a regular
1389 object to override a weak symbol in a shared object. */
1394 || (h->root.type == bfd_link_hash_common
1395 && (newweak || newfunc))))
1399 newdyncommon = FALSE;
1401 *psec = sec = bfd_und_section_ptr;
1402 *size_change_ok = TRUE;
1404 /* If we get here when the old symbol is a common symbol, then
1405 we are explicitly letting it override a weak symbol or
1406 function in a dynamic object, and we don't want to warn about
1407 a type change. If the old symbol is a defined symbol, a type
1408 change warning may still be appropriate. */
1410 if (h->root.type == bfd_link_hash_common)
1411 *type_change_ok = TRUE;
1414 /* Handle the special case of an old common symbol merging with a
1415 new symbol which looks like a common symbol in a shared object.
1416 We change *PSEC and *PVALUE to make the new symbol look like a
1417 common symbol, and let _bfd_generic_link_add_one_symbol do the
1421 && h->root.type == bfd_link_hash_common)
1425 newdyncommon = FALSE;
1426 *pvalue = sym->st_size;
1427 *psec = sec = bed->common_section (oldsec);
1428 *size_change_ok = TRUE;
1431 /* Skip weak definitions of symbols that are already defined. */
1432 if (newdef && olddef && newweak)
1434 /* Don't skip new non-IR weak syms. */
1435 if (!(oldbfd != NULL
1436 && (oldbfd->flags & BFD_PLUGIN) != 0
1437 && (abfd->flags & BFD_PLUGIN) == 0))
1440 /* Merge st_other. If the symbol already has a dynamic index,
1441 but visibility says it should not be visible, turn it into a
1443 elf_merge_st_other (abfd, h, sym, newdef, newdyn);
1444 if (h->dynindx != -1)
1445 switch (ELF_ST_VISIBILITY (h->other))
1449 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1454 /* If the old symbol is from a dynamic object, and the new symbol is
1455 a definition which is not from a dynamic object, then the new
1456 symbol overrides the old symbol. Symbols from regular files
1457 always take precedence over symbols from dynamic objects, even if
1458 they are defined after the dynamic object in the link.
1460 As above, we again permit a common symbol in a regular object to
1461 override a definition in a shared object if the shared object
1462 symbol is a function or is weak. */
1467 || (bfd_is_com_section (sec)
1468 && (oldweak || oldfunc)))
1473 /* Change the hash table entry to undefined, and let
1474 _bfd_generic_link_add_one_symbol do the right thing with the
1477 h->root.type = bfd_link_hash_undefined;
1478 h->root.u.undef.abfd = h->root.u.def.section->owner;
1479 *size_change_ok = TRUE;
1482 olddyncommon = FALSE;
1484 /* We again permit a type change when a common symbol may be
1485 overriding a function. */
1487 if (bfd_is_com_section (sec))
1491 /* If a common symbol overrides a function, make sure
1492 that it isn't defined dynamically nor has type
1495 h->type = STT_NOTYPE;
1497 *type_change_ok = TRUE;
1500 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1503 /* This union may have been set to be non-NULL when this symbol
1504 was seen in a dynamic object. We must force the union to be
1505 NULL, so that it is correct for a regular symbol. */
1506 h->verinfo.vertree = NULL;
1509 /* Handle the special case of a new common symbol merging with an
1510 old symbol that looks like it might be a common symbol defined in
1511 a shared object. Note that we have already handled the case in
1512 which a new common symbol should simply override the definition
1513 in the shared library. */
1516 && bfd_is_com_section (sec)
1519 /* It would be best if we could set the hash table entry to a
1520 common symbol, but we don't know what to use for the section
1521 or the alignment. */
1522 if (! ((*info->callbacks->multiple_common)
1523 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1526 /* If the presumed common symbol in the dynamic object is
1527 larger, pretend that the new symbol has its size. */
1529 if (h->size > *pvalue)
1532 /* We need to remember the alignment required by the symbol
1533 in the dynamic object. */
1534 BFD_ASSERT (pold_alignment);
1535 *pold_alignment = h->root.u.def.section->alignment_power;
1538 olddyncommon = FALSE;
1540 h->root.type = bfd_link_hash_undefined;
1541 h->root.u.undef.abfd = h->root.u.def.section->owner;
1543 *size_change_ok = TRUE;
1544 *type_change_ok = TRUE;
1546 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1549 h->verinfo.vertree = NULL;
1554 /* Handle the case where we had a versioned symbol in a dynamic
1555 library and now find a definition in a normal object. In this
1556 case, we make the versioned symbol point to the normal one. */
1557 flip->root.type = h->root.type;
1558 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1559 h->root.type = bfd_link_hash_indirect;
1560 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1561 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1565 flip->ref_dynamic = 1;
1572 /* This function is called to create an indirect symbol from the
1573 default for the symbol with the default version if needed. The
1574 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1575 set DYNSYM if the new indirect symbol is dynamic. */
1578 _bfd_elf_add_default_symbol (bfd *abfd,
1579 struct bfd_link_info *info,
1580 struct elf_link_hash_entry *h,
1582 Elf_Internal_Sym *sym,
1585 bfd_boolean *dynsym,
1586 bfd_boolean override)
1588 bfd_boolean type_change_ok;
1589 bfd_boolean size_change_ok;
1592 struct elf_link_hash_entry *hi;
1593 struct bfd_link_hash_entry *bh;
1594 const struct elf_backend_data *bed;
1595 bfd_boolean collect;
1596 bfd_boolean dynamic;
1598 size_t len, shortlen;
1601 /* If this symbol has a version, and it is the default version, we
1602 create an indirect symbol from the default name to the fully
1603 decorated name. This will cause external references which do not
1604 specify a version to be bound to this version of the symbol. */
1605 p = strchr (name, ELF_VER_CHR);
1606 if (p == NULL || p[1] != ELF_VER_CHR)
1611 /* We are overridden by an old definition. We need to check if we
1612 need to create the indirect symbol from the default name. */
1613 hi = elf_link_hash_lookup (elf_hash_table (info), name, TRUE,
1615 BFD_ASSERT (hi != NULL);
1618 while (hi->root.type == bfd_link_hash_indirect
1619 || hi->root.type == bfd_link_hash_warning)
1621 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1627 bed = get_elf_backend_data (abfd);
1628 collect = bed->collect;
1629 dynamic = (abfd->flags & DYNAMIC) != 0;
1631 shortlen = p - name;
1632 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1633 if (shortname == NULL)
1635 memcpy (shortname, name, shortlen);
1636 shortname[shortlen] = '\0';
1638 /* We are going to create a new symbol. Merge it with any existing
1639 symbol with this name. For the purposes of the merge, act as
1640 though we were defining the symbol we just defined, although we
1641 actually going to define an indirect symbol. */
1642 type_change_ok = FALSE;
1643 size_change_ok = FALSE;
1645 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1646 NULL, &hi, &skip, &override,
1647 &type_change_ok, &size_change_ok))
1656 if (! (_bfd_generic_link_add_one_symbol
1657 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1658 0, name, FALSE, collect, &bh)))
1660 hi = (struct elf_link_hash_entry *) bh;
1664 /* In this case the symbol named SHORTNAME is overriding the
1665 indirect symbol we want to add. We were planning on making
1666 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1667 is the name without a version. NAME is the fully versioned
1668 name, and it is the default version.
1670 Overriding means that we already saw a definition for the
1671 symbol SHORTNAME in a regular object, and it is overriding
1672 the symbol defined in the dynamic object.
1674 When this happens, we actually want to change NAME, the
1675 symbol we just added, to refer to SHORTNAME. This will cause
1676 references to NAME in the shared object to become references
1677 to SHORTNAME in the regular object. This is what we expect
1678 when we override a function in a shared object: that the
1679 references in the shared object will be mapped to the
1680 definition in the regular object. */
1682 while (hi->root.type == bfd_link_hash_indirect
1683 || hi->root.type == bfd_link_hash_warning)
1684 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1686 h->root.type = bfd_link_hash_indirect;
1687 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1691 hi->ref_dynamic = 1;
1695 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1700 /* Now set HI to H, so that the following code will set the
1701 other fields correctly. */
1705 /* Check if HI is a warning symbol. */
1706 if (hi->root.type == bfd_link_hash_warning)
1707 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1709 /* If there is a duplicate definition somewhere, then HI may not
1710 point to an indirect symbol. We will have reported an error to
1711 the user in that case. */
1713 if (hi->root.type == bfd_link_hash_indirect)
1715 struct elf_link_hash_entry *ht;
1717 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1718 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1720 /* See if the new flags lead us to realize that the symbol must
1726 if (! info->executable
1732 if (hi->ref_regular)
1738 /* We also need to define an indirection from the nondefault version
1742 len = strlen (name);
1743 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1744 if (shortname == NULL)
1746 memcpy (shortname, name, shortlen);
1747 memcpy (shortname + shortlen, p + 1, len - shortlen);
1749 /* Once again, merge with any existing symbol. */
1750 type_change_ok = FALSE;
1751 size_change_ok = FALSE;
1753 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1754 NULL, &hi, &skip, &override,
1755 &type_change_ok, &size_change_ok))
1763 /* Here SHORTNAME is a versioned name, so we don't expect to see
1764 the type of override we do in the case above unless it is
1765 overridden by a versioned definition. */
1766 if (hi->root.type != bfd_link_hash_defined
1767 && hi->root.type != bfd_link_hash_defweak)
1768 (*_bfd_error_handler)
1769 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1775 if (! (_bfd_generic_link_add_one_symbol
1776 (info, abfd, shortname, BSF_INDIRECT,
1777 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1779 hi = (struct elf_link_hash_entry *) bh;
1781 /* If there is a duplicate definition somewhere, then HI may not
1782 point to an indirect symbol. We will have reported an error
1783 to the user in that case. */
1785 if (hi->root.type == bfd_link_hash_indirect)
1787 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1789 /* See if the new flags lead us to realize that the symbol
1795 if (! info->executable
1801 if (hi->ref_regular)
1811 /* This routine is used to export all defined symbols into the dynamic
1812 symbol table. It is called via elf_link_hash_traverse. */
1815 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1817 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1819 /* Ignore this if we won't export it. */
1820 if (!eif->info->export_dynamic && !h->dynamic)
1823 /* Ignore indirect symbols. These are added by the versioning code. */
1824 if (h->root.type == bfd_link_hash_indirect)
1827 if (h->root.type == bfd_link_hash_warning)
1828 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1830 if (h->dynindx == -1
1836 if (eif->verdefs == NULL
1837 || (bfd_find_version_for_sym (eif->verdefs, h->root.root.string, &hide)
1840 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1851 /* Look through the symbols which are defined in other shared
1852 libraries and referenced here. Update the list of version
1853 dependencies. This will be put into the .gnu.version_r section.
1854 This function is called via elf_link_hash_traverse. */
1857 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1860 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1861 Elf_Internal_Verneed *t;
1862 Elf_Internal_Vernaux *a;
1865 if (h->root.type == bfd_link_hash_warning)
1866 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1868 /* We only care about symbols defined in shared objects with version
1873 || h->verinfo.verdef == NULL)
1876 /* See if we already know about this version. */
1877 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1881 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1884 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1885 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1891 /* This is a new version. Add it to tree we are building. */
1896 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1899 rinfo->failed = TRUE;
1903 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1904 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1905 elf_tdata (rinfo->info->output_bfd)->verref = t;
1909 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1912 rinfo->failed = TRUE;
1916 /* Note that we are copying a string pointer here, and testing it
1917 above. If bfd_elf_string_from_elf_section is ever changed to
1918 discard the string data when low in memory, this will have to be
1920 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1922 a->vna_flags = h->verinfo.verdef->vd_flags;
1923 a->vna_nextptr = t->vn_auxptr;
1925 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1928 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1935 /* Figure out appropriate versions for all the symbols. We may not
1936 have the version number script until we have read all of the input
1937 files, so until that point we don't know which symbols should be
1938 local. This function is called via elf_link_hash_traverse. */
1941 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1943 struct elf_info_failed *sinfo;
1944 struct bfd_link_info *info;
1945 const struct elf_backend_data *bed;
1946 struct elf_info_failed eif;
1950 sinfo = (struct elf_info_failed *) data;
1953 if (h->root.type == bfd_link_hash_warning)
1954 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1956 /* Fix the symbol flags. */
1959 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1962 sinfo->failed = TRUE;
1966 /* We only need version numbers for symbols defined in regular
1968 if (!h->def_regular)
1971 bed = get_elf_backend_data (info->output_bfd);
1972 p = strchr (h->root.root.string, ELF_VER_CHR);
1973 if (p != NULL && h->verinfo.vertree == NULL)
1975 struct bfd_elf_version_tree *t;
1980 /* There are two consecutive ELF_VER_CHR characters if this is
1981 not a hidden symbol. */
1983 if (*p == ELF_VER_CHR)
1989 /* If there is no version string, we can just return out. */
1997 /* Look for the version. If we find it, it is no longer weak. */
1998 for (t = sinfo->verdefs; t != NULL; t = t->next)
2000 if (strcmp (t->name, p) == 0)
2004 struct bfd_elf_version_expr *d;
2006 len = p - h->root.root.string;
2007 alc = (char *) bfd_malloc (len);
2010 sinfo->failed = TRUE;
2013 memcpy (alc, h->root.root.string, len - 1);
2014 alc[len - 1] = '\0';
2015 if (alc[len - 2] == ELF_VER_CHR)
2016 alc[len - 2] = '\0';
2018 h->verinfo.vertree = t;
2022 if (t->globals.list != NULL)
2023 d = (*t->match) (&t->globals, NULL, alc);
2025 /* See if there is anything to force this symbol to
2027 if (d == NULL && t->locals.list != NULL)
2029 d = (*t->match) (&t->locals, NULL, alc);
2032 && ! info->export_dynamic)
2033 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2041 /* If we are building an application, we need to create a
2042 version node for this version. */
2043 if (t == NULL && info->executable)
2045 struct bfd_elf_version_tree **pp;
2048 /* If we aren't going to export this symbol, we don't need
2049 to worry about it. */
2050 if (h->dynindx == -1)
2054 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2057 sinfo->failed = TRUE;
2062 t->name_indx = (unsigned int) -1;
2066 /* Don't count anonymous version tag. */
2067 if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0)
2069 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
2071 t->vernum = version_index;
2075 h->verinfo.vertree = t;
2079 /* We could not find the version for a symbol when
2080 generating a shared archive. Return an error. */
2081 (*_bfd_error_handler)
2082 (_("%B: version node not found for symbol %s"),
2083 info->output_bfd, h->root.root.string);
2084 bfd_set_error (bfd_error_bad_value);
2085 sinfo->failed = TRUE;
2093 /* If we don't have a version for this symbol, see if we can find
2095 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
2099 h->verinfo.vertree = bfd_find_version_for_sym (sinfo->verdefs,
2100 h->root.root.string, &hide);
2101 if (h->verinfo.vertree != NULL && hide)
2102 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2108 /* Read and swap the relocs from the section indicated by SHDR. This
2109 may be either a REL or a RELA section. The relocations are
2110 translated into RELA relocations and stored in INTERNAL_RELOCS,
2111 which should have already been allocated to contain enough space.
2112 The EXTERNAL_RELOCS are a buffer where the external form of the
2113 relocations should be stored.
2115 Returns FALSE if something goes wrong. */
2118 elf_link_read_relocs_from_section (bfd *abfd,
2120 Elf_Internal_Shdr *shdr,
2121 void *external_relocs,
2122 Elf_Internal_Rela *internal_relocs)
2124 const struct elf_backend_data *bed;
2125 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2126 const bfd_byte *erela;
2127 const bfd_byte *erelaend;
2128 Elf_Internal_Rela *irela;
2129 Elf_Internal_Shdr *symtab_hdr;
2132 /* Position ourselves at the start of the section. */
2133 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2136 /* Read the relocations. */
2137 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2140 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2141 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2143 bed = get_elf_backend_data (abfd);
2145 /* Convert the external relocations to the internal format. */
2146 if (shdr->sh_entsize == bed->s->sizeof_rel)
2147 swap_in = bed->s->swap_reloc_in;
2148 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2149 swap_in = bed->s->swap_reloca_in;
2152 bfd_set_error (bfd_error_wrong_format);
2156 erela = (const bfd_byte *) external_relocs;
2157 erelaend = erela + shdr->sh_size;
2158 irela = internal_relocs;
2159 while (erela < erelaend)
2163 (*swap_in) (abfd, erela, irela);
2164 r_symndx = ELF32_R_SYM (irela->r_info);
2165 if (bed->s->arch_size == 64)
2169 if ((size_t) r_symndx >= nsyms)
2171 (*_bfd_error_handler)
2172 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2173 " for offset 0x%lx in section `%A'"),
2175 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2176 bfd_set_error (bfd_error_bad_value);
2180 else if (r_symndx != STN_UNDEF)
2182 (*_bfd_error_handler)
2183 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2184 " when the object file has no symbol table"),
2186 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2187 bfd_set_error (bfd_error_bad_value);
2190 irela += bed->s->int_rels_per_ext_rel;
2191 erela += shdr->sh_entsize;
2197 /* Read and swap the relocs for a section O. They may have been
2198 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2199 not NULL, they are used as buffers to read into. They are known to
2200 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2201 the return value is allocated using either malloc or bfd_alloc,
2202 according to the KEEP_MEMORY argument. If O has two relocation
2203 sections (both REL and RELA relocations), then the REL_HDR
2204 relocations will appear first in INTERNAL_RELOCS, followed by the
2205 RELA_HDR relocations. */
2208 _bfd_elf_link_read_relocs (bfd *abfd,
2210 void *external_relocs,
2211 Elf_Internal_Rela *internal_relocs,
2212 bfd_boolean keep_memory)
2214 void *alloc1 = NULL;
2215 Elf_Internal_Rela *alloc2 = NULL;
2216 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2217 struct bfd_elf_section_data *esdo = elf_section_data (o);
2218 Elf_Internal_Rela *internal_rela_relocs;
2220 if (esdo->relocs != NULL)
2221 return esdo->relocs;
2223 if (o->reloc_count == 0)
2226 if (internal_relocs == NULL)
2230 size = o->reloc_count;
2231 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2233 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2235 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2236 if (internal_relocs == NULL)
2240 if (external_relocs == NULL)
2242 bfd_size_type size = 0;
2245 size += esdo->rel.hdr->sh_size;
2247 size += esdo->rela.hdr->sh_size;
2249 alloc1 = bfd_malloc (size);
2252 external_relocs = alloc1;
2255 internal_rela_relocs = internal_relocs;
2258 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2262 external_relocs = (((bfd_byte *) external_relocs)
2263 + esdo->rel.hdr->sh_size);
2264 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2265 * bed->s->int_rels_per_ext_rel);
2269 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2271 internal_rela_relocs)))
2274 /* Cache the results for next time, if we can. */
2276 esdo->relocs = internal_relocs;
2281 /* Don't free alloc2, since if it was allocated we are passing it
2282 back (under the name of internal_relocs). */
2284 return internal_relocs;
2292 bfd_release (abfd, alloc2);
2299 /* Compute the size of, and allocate space for, REL_HDR which is the
2300 section header for a section containing relocations for O. */
2303 _bfd_elf_link_size_reloc_section (bfd *abfd,
2304 struct bfd_elf_section_reloc_data *reldata)
2306 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2308 /* That allows us to calculate the size of the section. */
2309 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2311 /* The contents field must last into write_object_contents, so we
2312 allocate it with bfd_alloc rather than malloc. Also since we
2313 cannot be sure that the contents will actually be filled in,
2314 we zero the allocated space. */
2315 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2316 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2319 if (reldata->hashes == NULL && reldata->count)
2321 struct elf_link_hash_entry **p;
2323 p = (struct elf_link_hash_entry **)
2324 bfd_zmalloc (reldata->count * sizeof (struct elf_link_hash_entry *));
2328 reldata->hashes = p;
2334 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2335 originated from the section given by INPUT_REL_HDR) to the
2339 _bfd_elf_link_output_relocs (bfd *output_bfd,
2340 asection *input_section,
2341 Elf_Internal_Shdr *input_rel_hdr,
2342 Elf_Internal_Rela *internal_relocs,
2343 struct elf_link_hash_entry **rel_hash
2346 Elf_Internal_Rela *irela;
2347 Elf_Internal_Rela *irelaend;
2349 struct bfd_elf_section_reloc_data *output_reldata;
2350 asection *output_section;
2351 const struct elf_backend_data *bed;
2352 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2353 struct bfd_elf_section_data *esdo;
2355 output_section = input_section->output_section;
2357 bed = get_elf_backend_data (output_bfd);
2358 esdo = elf_section_data (output_section);
2359 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2361 output_reldata = &esdo->rel;
2362 swap_out = bed->s->swap_reloc_out;
2364 else if (esdo->rela.hdr
2365 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2367 output_reldata = &esdo->rela;
2368 swap_out = bed->s->swap_reloca_out;
2372 (*_bfd_error_handler)
2373 (_("%B: relocation size mismatch in %B section %A"),
2374 output_bfd, input_section->owner, input_section);
2375 bfd_set_error (bfd_error_wrong_format);
2379 erel = output_reldata->hdr->contents;
2380 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2381 irela = internal_relocs;
2382 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2383 * bed->s->int_rels_per_ext_rel);
2384 while (irela < irelaend)
2386 (*swap_out) (output_bfd, irela, erel);
2387 irela += bed->s->int_rels_per_ext_rel;
2388 erel += input_rel_hdr->sh_entsize;
2391 /* Bump the counter, so that we know where to add the next set of
2393 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2398 /* Make weak undefined symbols in PIE dynamic. */
2401 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2402 struct elf_link_hash_entry *h)
2406 && h->root.type == bfd_link_hash_undefweak)
2407 return bfd_elf_link_record_dynamic_symbol (info, h);
2412 /* Fix up the flags for a symbol. This handles various cases which
2413 can only be fixed after all the input files are seen. This is
2414 currently called by both adjust_dynamic_symbol and
2415 assign_sym_version, which is unnecessary but perhaps more robust in
2416 the face of future changes. */
2419 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2420 struct elf_info_failed *eif)
2422 const struct elf_backend_data *bed;
2424 /* If this symbol was mentioned in a non-ELF file, try to set
2425 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2426 permit a non-ELF file to correctly refer to a symbol defined in
2427 an ELF dynamic object. */
2430 while (h->root.type == bfd_link_hash_indirect)
2431 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2433 if (h->root.type != bfd_link_hash_defined
2434 && h->root.type != bfd_link_hash_defweak)
2437 h->ref_regular_nonweak = 1;
2441 if (h->root.u.def.section->owner != NULL
2442 && (bfd_get_flavour (h->root.u.def.section->owner)
2443 == bfd_target_elf_flavour))
2446 h->ref_regular_nonweak = 1;
2452 if (h->dynindx == -1
2456 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2465 /* Unfortunately, NON_ELF is only correct if the symbol
2466 was first seen in a non-ELF file. Fortunately, if the symbol
2467 was first seen in an ELF file, we're probably OK unless the
2468 symbol was defined in a non-ELF file. Catch that case here.
2469 FIXME: We're still in trouble if the symbol was first seen in
2470 a dynamic object, and then later in a non-ELF regular object. */
2471 if ((h->root.type == bfd_link_hash_defined
2472 || h->root.type == bfd_link_hash_defweak)
2474 && (h->root.u.def.section->owner != NULL
2475 ? (bfd_get_flavour (h->root.u.def.section->owner)
2476 != bfd_target_elf_flavour)
2477 : (bfd_is_abs_section (h->root.u.def.section)
2478 && !h->def_dynamic)))
2482 /* Backend specific symbol fixup. */
2483 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2484 if (bed->elf_backend_fixup_symbol
2485 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2488 /* If this is a final link, and the symbol was defined as a common
2489 symbol in a regular object file, and there was no definition in
2490 any dynamic object, then the linker will have allocated space for
2491 the symbol in a common section but the DEF_REGULAR
2492 flag will not have been set. */
2493 if (h->root.type == bfd_link_hash_defined
2497 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
2500 /* If -Bsymbolic was used (which means to bind references to global
2501 symbols to the definition within the shared object), and this
2502 symbol was defined in a regular object, then it actually doesn't
2503 need a PLT entry. Likewise, if the symbol has non-default
2504 visibility. If the symbol has hidden or internal visibility, we
2505 will force it local. */
2507 && eif->info->shared
2508 && is_elf_hash_table (eif->info->hash)
2509 && (SYMBOLIC_BIND (eif->info, h)
2510 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2513 bfd_boolean force_local;
2515 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2516 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2517 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2520 /* If a weak undefined symbol has non-default visibility, we also
2521 hide it from the dynamic linker. */
2522 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2523 && h->root.type == bfd_link_hash_undefweak)
2524 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2526 /* If this is a weak defined symbol in a dynamic object, and we know
2527 the real definition in the dynamic object, copy interesting flags
2528 over to the real definition. */
2529 if (h->u.weakdef != NULL)
2531 struct elf_link_hash_entry *weakdef;
2533 weakdef = h->u.weakdef;
2534 if (h->root.type == bfd_link_hash_indirect)
2535 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2537 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2538 || h->root.type == bfd_link_hash_defweak);
2539 BFD_ASSERT (weakdef->def_dynamic);
2541 /* If the real definition is defined by a regular object file,
2542 don't do anything special. See the longer description in
2543 _bfd_elf_adjust_dynamic_symbol, below. */
2544 if (weakdef->def_regular)
2545 h->u.weakdef = NULL;
2548 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2549 || weakdef->root.type == bfd_link_hash_defweak);
2550 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2557 /* Make the backend pick a good value for a dynamic symbol. This is
2558 called via elf_link_hash_traverse, and also calls itself
2562 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2564 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2566 const struct elf_backend_data *bed;
2568 if (! is_elf_hash_table (eif->info->hash))
2571 if (h->root.type == bfd_link_hash_warning)
2573 h->got = elf_hash_table (eif->info)->init_got_offset;
2574 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2576 /* When warning symbols are created, they **replace** the "real"
2577 entry in the hash table, thus we never get to see the real
2578 symbol in a hash traversal. So look at it now. */
2579 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2582 /* Ignore indirect symbols. These are added by the versioning code. */
2583 if (h->root.type == bfd_link_hash_indirect)
2586 /* Fix the symbol flags. */
2587 if (! _bfd_elf_fix_symbol_flags (h, eif))
2590 /* If this symbol does not require a PLT entry, and it is not
2591 defined by a dynamic object, or is not referenced by a regular
2592 object, ignore it. We do have to handle a weak defined symbol,
2593 even if no regular object refers to it, if we decided to add it
2594 to the dynamic symbol table. FIXME: Do we normally need to worry
2595 about symbols which are defined by one dynamic object and
2596 referenced by another one? */
2598 && h->type != STT_GNU_IFUNC
2602 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2604 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2608 /* If we've already adjusted this symbol, don't do it again. This
2609 can happen via a recursive call. */
2610 if (h->dynamic_adjusted)
2613 /* Don't look at this symbol again. Note that we must set this
2614 after checking the above conditions, because we may look at a
2615 symbol once, decide not to do anything, and then get called
2616 recursively later after REF_REGULAR is set below. */
2617 h->dynamic_adjusted = 1;
2619 /* If this is a weak definition, and we know a real definition, and
2620 the real symbol is not itself defined by a regular object file,
2621 then get a good value for the real definition. We handle the
2622 real symbol first, for the convenience of the backend routine.
2624 Note that there is a confusing case here. If the real definition
2625 is defined by a regular object file, we don't get the real symbol
2626 from the dynamic object, but we do get the weak symbol. If the
2627 processor backend uses a COPY reloc, then if some routine in the
2628 dynamic object changes the real symbol, we will not see that
2629 change in the corresponding weak symbol. This is the way other
2630 ELF linkers work as well, and seems to be a result of the shared
2633 I will clarify this issue. Most SVR4 shared libraries define the
2634 variable _timezone and define timezone as a weak synonym. The
2635 tzset call changes _timezone. If you write
2636 extern int timezone;
2638 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2639 you might expect that, since timezone is a synonym for _timezone,
2640 the same number will print both times. However, if the processor
2641 backend uses a COPY reloc, then actually timezone will be copied
2642 into your process image, and, since you define _timezone
2643 yourself, _timezone will not. Thus timezone and _timezone will
2644 wind up at different memory locations. The tzset call will set
2645 _timezone, leaving timezone unchanged. */
2647 if (h->u.weakdef != NULL)
2649 /* If we get to this point, we know there is an implicit
2650 reference by a regular object file via the weak symbol H.
2651 FIXME: Is this really true? What if the traversal finds
2652 H->U.WEAKDEF before it finds H? */
2653 h->u.weakdef->ref_regular = 1;
2655 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2659 /* If a symbol has no type and no size and does not require a PLT
2660 entry, then we are probably about to do the wrong thing here: we
2661 are probably going to create a COPY reloc for an empty object.
2662 This case can arise when a shared object is built with assembly
2663 code, and the assembly code fails to set the symbol type. */
2665 && h->type == STT_NOTYPE
2667 (*_bfd_error_handler)
2668 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2669 h->root.root.string);
2671 dynobj = elf_hash_table (eif->info)->dynobj;
2672 bed = get_elf_backend_data (dynobj);
2674 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2683 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2687 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
2690 unsigned int power_of_two;
2692 asection *sec = h->root.u.def.section;
2694 /* The section aligment of definition is the maximum alignment
2695 requirement of symbols defined in the section. Since we don't
2696 know the symbol alignment requirement, we start with the
2697 maximum alignment and check low bits of the symbol address
2698 for the minimum alignment. */
2699 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2700 mask = ((bfd_vma) 1 << power_of_two) - 1;
2701 while ((h->root.u.def.value & mask) != 0)
2707 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2710 /* Adjust the section alignment if needed. */
2711 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2716 /* We make sure that the symbol will be aligned properly. */
2717 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2719 /* Define the symbol as being at this point in DYNBSS. */
2720 h->root.u.def.section = dynbss;
2721 h->root.u.def.value = dynbss->size;
2723 /* Increment the size of DYNBSS to make room for the symbol. */
2724 dynbss->size += h->size;
2729 /* Adjust all external symbols pointing into SEC_MERGE sections
2730 to reflect the object merging within the sections. */
2733 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2737 if (h->root.type == bfd_link_hash_warning)
2738 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2740 if ((h->root.type == bfd_link_hash_defined
2741 || h->root.type == bfd_link_hash_defweak)
2742 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2743 && sec->sec_info_type == ELF_INFO_TYPE_MERGE)
2745 bfd *output_bfd = (bfd *) data;
2747 h->root.u.def.value =
2748 _bfd_merged_section_offset (output_bfd,
2749 &h->root.u.def.section,
2750 elf_section_data (sec)->sec_info,
2751 h->root.u.def.value);
2757 /* Returns false if the symbol referred to by H should be considered
2758 to resolve local to the current module, and true if it should be
2759 considered to bind dynamically. */
2762 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2763 struct bfd_link_info *info,
2764 bfd_boolean not_local_protected)
2766 bfd_boolean binding_stays_local_p;
2767 const struct elf_backend_data *bed;
2768 struct elf_link_hash_table *hash_table;
2773 while (h->root.type == bfd_link_hash_indirect
2774 || h->root.type == bfd_link_hash_warning)
2775 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2777 /* If it was forced local, then clearly it's not dynamic. */
2778 if (h->dynindx == -1)
2780 if (h->forced_local)
2783 /* Identify the cases where name binding rules say that a
2784 visible symbol resolves locally. */
2785 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2787 switch (ELF_ST_VISIBILITY (h->other))
2794 hash_table = elf_hash_table (info);
2795 if (!is_elf_hash_table (hash_table))
2798 bed = get_elf_backend_data (hash_table->dynobj);
2800 /* Proper resolution for function pointer equality may require
2801 that these symbols perhaps be resolved dynamically, even though
2802 we should be resolving them to the current module. */
2803 if (!not_local_protected || !bed->is_function_type (h->type))
2804 binding_stays_local_p = TRUE;
2811 /* If it isn't defined locally, then clearly it's dynamic. */
2812 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2815 /* Otherwise, the symbol is dynamic if binding rules don't tell
2816 us that it remains local. */
2817 return !binding_stays_local_p;
2820 /* Return true if the symbol referred to by H should be considered
2821 to resolve local to the current module, and false otherwise. Differs
2822 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2823 undefined symbols. The two functions are virtually identical except
2824 for the place where forced_local and dynindx == -1 are tested. If
2825 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2826 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2827 the symbol is local only for defined symbols.
2828 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2829 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2830 treatment of undefined weak symbols. For those that do not make
2831 undefined weak symbols dynamic, both functions may return false. */
2834 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2835 struct bfd_link_info *info,
2836 bfd_boolean local_protected)
2838 const struct elf_backend_data *bed;
2839 struct elf_link_hash_table *hash_table;
2841 /* If it's a local sym, of course we resolve locally. */
2845 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2846 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2847 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2850 /* Common symbols that become definitions don't get the DEF_REGULAR
2851 flag set, so test it first, and don't bail out. */
2852 if (ELF_COMMON_DEF_P (h))
2854 /* If we don't have a definition in a regular file, then we can't
2855 resolve locally. The sym is either undefined or dynamic. */
2856 else if (!h->def_regular)
2859 /* Forced local symbols resolve locally. */
2860 if (h->forced_local)
2863 /* As do non-dynamic symbols. */
2864 if (h->dynindx == -1)
2867 /* At this point, we know the symbol is defined and dynamic. In an
2868 executable it must resolve locally, likewise when building symbolic
2869 shared libraries. */
2870 if (info->executable || SYMBOLIC_BIND (info, h))
2873 /* Now deal with defined dynamic symbols in shared libraries. Ones
2874 with default visibility might not resolve locally. */
2875 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2878 hash_table = elf_hash_table (info);
2879 if (!is_elf_hash_table (hash_table))
2882 bed = get_elf_backend_data (hash_table->dynobj);
2884 /* STV_PROTECTED non-function symbols are local. */
2885 if (!bed->is_function_type (h->type))
2888 /* Function pointer equality tests may require that STV_PROTECTED
2889 symbols be treated as dynamic symbols. If the address of a
2890 function not defined in an executable is set to that function's
2891 plt entry in the executable, then the address of the function in
2892 a shared library must also be the plt entry in the executable. */
2893 return local_protected;
2896 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2897 aligned. Returns the first TLS output section. */
2899 struct bfd_section *
2900 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2902 struct bfd_section *sec, *tls;
2903 unsigned int align = 0;
2905 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2906 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2910 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2911 if (sec->alignment_power > align)
2912 align = sec->alignment_power;
2914 elf_hash_table (info)->tls_sec = tls;
2916 /* Ensure the alignment of the first section is the largest alignment,
2917 so that the tls segment starts aligned. */
2919 tls->alignment_power = align;
2924 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2926 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2927 Elf_Internal_Sym *sym)
2929 const struct elf_backend_data *bed;
2931 /* Local symbols do not count, but target specific ones might. */
2932 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2933 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2936 bed = get_elf_backend_data (abfd);
2937 /* Function symbols do not count. */
2938 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2941 /* If the section is undefined, then so is the symbol. */
2942 if (sym->st_shndx == SHN_UNDEF)
2945 /* If the symbol is defined in the common section, then
2946 it is a common definition and so does not count. */
2947 if (bed->common_definition (sym))
2950 /* If the symbol is in a target specific section then we
2951 must rely upon the backend to tell us what it is. */
2952 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2953 /* FIXME - this function is not coded yet:
2955 return _bfd_is_global_symbol_definition (abfd, sym);
2957 Instead for now assume that the definition is not global,
2958 Even if this is wrong, at least the linker will behave
2959 in the same way that it used to do. */
2965 /* Search the symbol table of the archive element of the archive ABFD
2966 whose archive map contains a mention of SYMDEF, and determine if
2967 the symbol is defined in this element. */
2969 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2971 Elf_Internal_Shdr * hdr;
2972 bfd_size_type symcount;
2973 bfd_size_type extsymcount;
2974 bfd_size_type extsymoff;
2975 Elf_Internal_Sym *isymbuf;
2976 Elf_Internal_Sym *isym;
2977 Elf_Internal_Sym *isymend;
2980 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2984 if (! bfd_check_format (abfd, bfd_object))
2987 /* If we have already included the element containing this symbol in the
2988 link then we do not need to include it again. Just claim that any symbol
2989 it contains is not a definition, so that our caller will not decide to
2990 (re)include this element. */
2991 if (abfd->archive_pass)
2994 /* Select the appropriate symbol table. */
2995 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2996 hdr = &elf_tdata (abfd)->symtab_hdr;
2998 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3000 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
3002 /* The sh_info field of the symtab header tells us where the
3003 external symbols start. We don't care about the local symbols. */
3004 if (elf_bad_symtab (abfd))
3006 extsymcount = symcount;
3011 extsymcount = symcount - hdr->sh_info;
3012 extsymoff = hdr->sh_info;
3015 if (extsymcount == 0)
3018 /* Read in the symbol table. */
3019 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3021 if (isymbuf == NULL)
3024 /* Scan the symbol table looking for SYMDEF. */
3026 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
3030 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3035 if (strcmp (name, symdef->name) == 0)
3037 result = is_global_data_symbol_definition (abfd, isym);
3047 /* Add an entry to the .dynamic table. */
3050 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3054 struct elf_link_hash_table *hash_table;
3055 const struct elf_backend_data *bed;
3057 bfd_size_type newsize;
3058 bfd_byte *newcontents;
3059 Elf_Internal_Dyn dyn;
3061 hash_table = elf_hash_table (info);
3062 if (! is_elf_hash_table (hash_table))
3065 bed = get_elf_backend_data (hash_table->dynobj);
3066 s = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
3067 BFD_ASSERT (s != NULL);
3069 newsize = s->size + bed->s->sizeof_dyn;
3070 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3071 if (newcontents == NULL)
3075 dyn.d_un.d_val = val;
3076 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3079 s->contents = newcontents;
3084 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3085 otherwise just check whether one already exists. Returns -1 on error,
3086 1 if a DT_NEEDED tag already exists, and 0 on success. */
3089 elf_add_dt_needed_tag (bfd *abfd,
3090 struct bfd_link_info *info,
3094 struct elf_link_hash_table *hash_table;
3095 bfd_size_type oldsize;
3096 bfd_size_type strindex;
3098 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3101 hash_table = elf_hash_table (info);
3102 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
3103 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3104 if (strindex == (bfd_size_type) -1)
3107 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
3110 const struct elf_backend_data *bed;
3113 bed = get_elf_backend_data (hash_table->dynobj);
3114 sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
3116 for (extdyn = sdyn->contents;
3117 extdyn < sdyn->contents + sdyn->size;
3118 extdyn += bed->s->sizeof_dyn)
3120 Elf_Internal_Dyn dyn;
3122 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3123 if (dyn.d_tag == DT_NEEDED
3124 && dyn.d_un.d_val == strindex)
3126 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3134 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3137 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3141 /* We were just checking for existence of the tag. */
3142 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3148 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3150 for (; needed != NULL; needed = needed->next)
3151 if (strcmp (soname, needed->name) == 0)
3157 /* Sort symbol by value and section. */
3159 elf_sort_symbol (const void *arg1, const void *arg2)
3161 const struct elf_link_hash_entry *h1;
3162 const struct elf_link_hash_entry *h2;
3163 bfd_signed_vma vdiff;
3165 h1 = *(const struct elf_link_hash_entry **) arg1;
3166 h2 = *(const struct elf_link_hash_entry **) arg2;
3167 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3169 return vdiff > 0 ? 1 : -1;
3172 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3174 return sdiff > 0 ? 1 : -1;
3179 /* This function is used to adjust offsets into .dynstr for
3180 dynamic symbols. This is called via elf_link_hash_traverse. */
3183 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3185 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3187 if (h->root.type == bfd_link_hash_warning)
3188 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3190 if (h->dynindx != -1)
3191 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3195 /* Assign string offsets in .dynstr, update all structures referencing
3199 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3201 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3202 struct elf_link_local_dynamic_entry *entry;
3203 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3204 bfd *dynobj = hash_table->dynobj;
3207 const struct elf_backend_data *bed;
3210 _bfd_elf_strtab_finalize (dynstr);
3211 size = _bfd_elf_strtab_size (dynstr);
3213 bed = get_elf_backend_data (dynobj);
3214 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3215 BFD_ASSERT (sdyn != NULL);
3217 /* Update all .dynamic entries referencing .dynstr strings. */
3218 for (extdyn = sdyn->contents;
3219 extdyn < sdyn->contents + sdyn->size;
3220 extdyn += bed->s->sizeof_dyn)
3222 Elf_Internal_Dyn dyn;
3224 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3228 dyn.d_un.d_val = size;
3238 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3243 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3246 /* Now update local dynamic symbols. */
3247 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3248 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3249 entry->isym.st_name);
3251 /* And the rest of dynamic symbols. */
3252 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3254 /* Adjust version definitions. */
3255 if (elf_tdata (output_bfd)->cverdefs)
3260 Elf_Internal_Verdef def;
3261 Elf_Internal_Verdaux defaux;
3263 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3267 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3269 p += sizeof (Elf_External_Verdef);
3270 if (def.vd_aux != sizeof (Elf_External_Verdef))
3272 for (i = 0; i < def.vd_cnt; ++i)
3274 _bfd_elf_swap_verdaux_in (output_bfd,
3275 (Elf_External_Verdaux *) p, &defaux);
3276 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3278 _bfd_elf_swap_verdaux_out (output_bfd,
3279 &defaux, (Elf_External_Verdaux *) p);
3280 p += sizeof (Elf_External_Verdaux);
3283 while (def.vd_next);
3286 /* Adjust version references. */
3287 if (elf_tdata (output_bfd)->verref)
3292 Elf_Internal_Verneed need;
3293 Elf_Internal_Vernaux needaux;
3295 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3299 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3301 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3302 _bfd_elf_swap_verneed_out (output_bfd, &need,
3303 (Elf_External_Verneed *) p);
3304 p += sizeof (Elf_External_Verneed);
3305 for (i = 0; i < need.vn_cnt; ++i)
3307 _bfd_elf_swap_vernaux_in (output_bfd,
3308 (Elf_External_Vernaux *) p, &needaux);
3309 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3311 _bfd_elf_swap_vernaux_out (output_bfd,
3313 (Elf_External_Vernaux *) p);
3314 p += sizeof (Elf_External_Vernaux);
3317 while (need.vn_next);
3323 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3324 The default is to only match when the INPUT and OUTPUT are exactly
3328 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3329 const bfd_target *output)
3331 return input == output;
3334 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3335 This version is used when different targets for the same architecture
3336 are virtually identical. */
3339 _bfd_elf_relocs_compatible (const bfd_target *input,
3340 const bfd_target *output)
3342 const struct elf_backend_data *obed, *ibed;
3344 if (input == output)
3347 ibed = xvec_get_elf_backend_data (input);
3348 obed = xvec_get_elf_backend_data (output);
3350 if (ibed->arch != obed->arch)
3353 /* If both backends are using this function, deem them compatible. */
3354 return ibed->relocs_compatible == obed->relocs_compatible;
3357 /* Add symbols from an ELF object file to the linker hash table. */
3360 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3362 Elf_Internal_Ehdr *ehdr;
3363 Elf_Internal_Shdr *hdr;
3364 bfd_size_type symcount;
3365 bfd_size_type extsymcount;
3366 bfd_size_type extsymoff;
3367 struct elf_link_hash_entry **sym_hash;
3368 bfd_boolean dynamic;
3369 Elf_External_Versym *extversym = NULL;
3370 Elf_External_Versym *ever;
3371 struct elf_link_hash_entry *weaks;
3372 struct elf_link_hash_entry **nondeflt_vers = NULL;
3373 bfd_size_type nondeflt_vers_cnt = 0;
3374 Elf_Internal_Sym *isymbuf = NULL;
3375 Elf_Internal_Sym *isym;
3376 Elf_Internal_Sym *isymend;
3377 const struct elf_backend_data *bed;
3378 bfd_boolean add_needed;
3379 struct elf_link_hash_table *htab;
3381 void *alloc_mark = NULL;
3382 struct bfd_hash_entry **old_table = NULL;
3383 unsigned int old_size = 0;
3384 unsigned int old_count = 0;
3385 void *old_tab = NULL;
3388 struct bfd_link_hash_entry *old_undefs = NULL;
3389 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3390 long old_dynsymcount = 0;
3392 size_t hashsize = 0;
3394 htab = elf_hash_table (info);
3395 bed = get_elf_backend_data (abfd);
3397 if ((abfd->flags & DYNAMIC) == 0)
3403 /* You can't use -r against a dynamic object. Also, there's no
3404 hope of using a dynamic object which does not exactly match
3405 the format of the output file. */
3406 if (info->relocatable
3407 || !is_elf_hash_table (htab)
3408 || info->output_bfd->xvec != abfd->xvec)
3410 if (info->relocatable)
3411 bfd_set_error (bfd_error_invalid_operation);
3413 bfd_set_error (bfd_error_wrong_format);
3418 ehdr = elf_elfheader (abfd);
3419 if (info->warn_alternate_em
3420 && bed->elf_machine_code != ehdr->e_machine
3421 && ((bed->elf_machine_alt1 != 0
3422 && ehdr->e_machine == bed->elf_machine_alt1)
3423 || (bed->elf_machine_alt2 != 0
3424 && ehdr->e_machine == bed->elf_machine_alt2)))
3425 info->callbacks->einfo
3426 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3427 ehdr->e_machine, abfd, bed->elf_machine_code);
3429 /* As a GNU extension, any input sections which are named
3430 .gnu.warning.SYMBOL are treated as warning symbols for the given
3431 symbol. This differs from .gnu.warning sections, which generate
3432 warnings when they are included in an output file. */
3433 if (info->executable)
3437 for (s = abfd->sections; s != NULL; s = s->next)
3441 name = bfd_get_section_name (abfd, s);
3442 if (CONST_STRNEQ (name, ".gnu.warning."))
3447 name += sizeof ".gnu.warning." - 1;
3449 /* If this is a shared object, then look up the symbol
3450 in the hash table. If it is there, and it is already
3451 been defined, then we will not be using the entry
3452 from this shared object, so we don't need to warn.
3453 FIXME: If we see the definition in a regular object
3454 later on, we will warn, but we shouldn't. The only
3455 fix is to keep track of what warnings we are supposed
3456 to emit, and then handle them all at the end of the
3460 struct elf_link_hash_entry *h;
3462 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3464 /* FIXME: What about bfd_link_hash_common? */
3466 && (h->root.type == bfd_link_hash_defined
3467 || h->root.type == bfd_link_hash_defweak))
3469 /* We don't want to issue this warning. Clobber
3470 the section size so that the warning does not
3471 get copied into the output file. */
3478 msg = (char *) bfd_alloc (abfd, sz + 1);
3482 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3487 if (! (_bfd_generic_link_add_one_symbol
3488 (info, abfd, name, BSF_WARNING, s, 0, msg,
3489 FALSE, bed->collect, NULL)))
3492 if (! info->relocatable)
3494 /* Clobber the section size so that the warning does
3495 not get copied into the output file. */
3498 /* Also set SEC_EXCLUDE, so that symbols defined in
3499 the warning section don't get copied to the output. */
3500 s->flags |= SEC_EXCLUDE;
3509 /* If we are creating a shared library, create all the dynamic
3510 sections immediately. We need to attach them to something,
3511 so we attach them to this BFD, provided it is the right
3512 format. FIXME: If there are no input BFD's of the same
3513 format as the output, we can't make a shared library. */
3515 && is_elf_hash_table (htab)
3516 && info->output_bfd->xvec == abfd->xvec
3517 && !htab->dynamic_sections_created)
3519 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3523 else if (!is_elf_hash_table (htab))
3528 const char *soname = NULL;
3530 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3533 /* ld --just-symbols and dynamic objects don't mix very well.
3534 ld shouldn't allow it. */
3535 if ((s = abfd->sections) != NULL
3536 && s->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
3539 /* If this dynamic lib was specified on the command line with
3540 --as-needed in effect, then we don't want to add a DT_NEEDED
3541 tag unless the lib is actually used. Similary for libs brought
3542 in by another lib's DT_NEEDED. When --no-add-needed is used
3543 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3544 any dynamic library in DT_NEEDED tags in the dynamic lib at
3546 add_needed = (elf_dyn_lib_class (abfd)
3547 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3548 | DYN_NO_NEEDED)) == 0;
3550 s = bfd_get_section_by_name (abfd, ".dynamic");
3555 unsigned int elfsec;
3556 unsigned long shlink;
3558 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3565 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3566 if (elfsec == SHN_BAD)
3567 goto error_free_dyn;
3568 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3570 for (extdyn = dynbuf;
3571 extdyn < dynbuf + s->size;
3572 extdyn += bed->s->sizeof_dyn)
3574 Elf_Internal_Dyn dyn;
3576 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3577 if (dyn.d_tag == DT_SONAME)
3579 unsigned int tagv = dyn.d_un.d_val;
3580 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3582 goto error_free_dyn;
3584 if (dyn.d_tag == DT_NEEDED)
3586 struct bfd_link_needed_list *n, **pn;
3588 unsigned int tagv = dyn.d_un.d_val;
3590 amt = sizeof (struct bfd_link_needed_list);
3591 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3592 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3593 if (n == NULL || fnm == NULL)
3594 goto error_free_dyn;
3595 amt = strlen (fnm) + 1;
3596 anm = (char *) bfd_alloc (abfd, amt);
3598 goto error_free_dyn;
3599 memcpy (anm, fnm, amt);
3603 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3607 if (dyn.d_tag == DT_RUNPATH)
3609 struct bfd_link_needed_list *n, **pn;
3611 unsigned int tagv = dyn.d_un.d_val;
3613 amt = sizeof (struct bfd_link_needed_list);
3614 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3615 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3616 if (n == NULL || fnm == NULL)
3617 goto error_free_dyn;
3618 amt = strlen (fnm) + 1;
3619 anm = (char *) bfd_alloc (abfd, amt);
3621 goto error_free_dyn;
3622 memcpy (anm, fnm, amt);
3626 for (pn = & runpath;
3632 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3633 if (!runpath && dyn.d_tag == DT_RPATH)
3635 struct bfd_link_needed_list *n, **pn;
3637 unsigned int tagv = dyn.d_un.d_val;
3639 amt = sizeof (struct bfd_link_needed_list);
3640 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3641 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3642 if (n == NULL || fnm == NULL)
3643 goto error_free_dyn;
3644 amt = strlen (fnm) + 1;
3645 anm = (char *) bfd_alloc (abfd, amt);
3647 goto error_free_dyn;
3648 memcpy (anm, fnm, amt);
3658 if (dyn.d_tag == DT_AUDIT)
3660 unsigned int tagv = dyn.d_un.d_val;
3661 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3668 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3669 frees all more recently bfd_alloc'd blocks as well. */
3675 struct bfd_link_needed_list **pn;
3676 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3681 /* We do not want to include any of the sections in a dynamic
3682 object in the output file. We hack by simply clobbering the
3683 list of sections in the BFD. This could be handled more
3684 cleanly by, say, a new section flag; the existing
3685 SEC_NEVER_LOAD flag is not the one we want, because that one
3686 still implies that the section takes up space in the output
3688 bfd_section_list_clear (abfd);
3690 /* Find the name to use in a DT_NEEDED entry that refers to this
3691 object. If the object has a DT_SONAME entry, we use it.
3692 Otherwise, if the generic linker stuck something in
3693 elf_dt_name, we use that. Otherwise, we just use the file
3695 if (soname == NULL || *soname == '\0')
3697 soname = elf_dt_name (abfd);
3698 if (soname == NULL || *soname == '\0')
3699 soname = bfd_get_filename (abfd);
3702 /* Save the SONAME because sometimes the linker emulation code
3703 will need to know it. */
3704 elf_dt_name (abfd) = soname;
3706 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3710 /* If we have already included this dynamic object in the
3711 link, just ignore it. There is no reason to include a
3712 particular dynamic object more than once. */
3716 /* Save the DT_AUDIT entry for the linker emulation code. */
3717 elf_dt_audit (abfd) = audit;
3720 /* If this is a dynamic object, we always link against the .dynsym
3721 symbol table, not the .symtab symbol table. The dynamic linker
3722 will only see the .dynsym symbol table, so there is no reason to
3723 look at .symtab for a dynamic object. */
3725 if (! dynamic || elf_dynsymtab (abfd) == 0)
3726 hdr = &elf_tdata (abfd)->symtab_hdr;
3728 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3730 symcount = hdr->sh_size / bed->s->sizeof_sym;
3732 /* The sh_info field of the symtab header tells us where the
3733 external symbols start. We don't care about the local symbols at
3735 if (elf_bad_symtab (abfd))
3737 extsymcount = symcount;
3742 extsymcount = symcount - hdr->sh_info;
3743 extsymoff = hdr->sh_info;
3747 if (extsymcount != 0)
3749 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3751 if (isymbuf == NULL)
3754 /* We store a pointer to the hash table entry for each external
3756 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3757 sym_hash = (struct elf_link_hash_entry **) bfd_alloc (abfd, amt);
3758 if (sym_hash == NULL)
3759 goto error_free_sym;
3760 elf_sym_hashes (abfd) = sym_hash;
3765 /* Read in any version definitions. */
3766 if (!_bfd_elf_slurp_version_tables (abfd,
3767 info->default_imported_symver))
3768 goto error_free_sym;
3770 /* Read in the symbol versions, but don't bother to convert them
3771 to internal format. */
3772 if (elf_dynversym (abfd) != 0)
3774 Elf_Internal_Shdr *versymhdr;
3776 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3777 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3778 if (extversym == NULL)
3779 goto error_free_sym;
3780 amt = versymhdr->sh_size;
3781 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3782 || bfd_bread (extversym, amt, abfd) != amt)
3783 goto error_free_vers;
3787 /* If we are loading an as-needed shared lib, save the symbol table
3788 state before we start adding symbols. If the lib turns out
3789 to be unneeded, restore the state. */
3790 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3795 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3797 struct bfd_hash_entry *p;
3798 struct elf_link_hash_entry *h;
3800 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3802 h = (struct elf_link_hash_entry *) p;
3803 entsize += htab->root.table.entsize;
3804 if (h->root.type == bfd_link_hash_warning)
3805 entsize += htab->root.table.entsize;
3809 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3810 hashsize = extsymcount * sizeof (struct elf_link_hash_entry *);
3811 old_tab = bfd_malloc (tabsize + entsize + hashsize);
3812 if (old_tab == NULL)
3813 goto error_free_vers;
3815 /* Remember the current objalloc pointer, so that all mem for
3816 symbols added can later be reclaimed. */
3817 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3818 if (alloc_mark == NULL)
3819 goto error_free_vers;
3821 /* Make a special call to the linker "notice" function to
3822 tell it that we are about to handle an as-needed lib. */
3823 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
3824 notice_as_needed, 0, NULL))
3825 goto error_free_vers;
3827 /* Clone the symbol table and sym hashes. Remember some
3828 pointers into the symbol table, and dynamic symbol count. */
3829 old_hash = (char *) old_tab + tabsize;
3830 old_ent = (char *) old_hash + hashsize;
3831 memcpy (old_tab, htab->root.table.table, tabsize);
3832 memcpy (old_hash, sym_hash, hashsize);
3833 old_undefs = htab->root.undefs;
3834 old_undefs_tail = htab->root.undefs_tail;
3835 old_table = htab->root.table.table;
3836 old_size = htab->root.table.size;
3837 old_count = htab->root.table.count;
3838 old_dynsymcount = htab->dynsymcount;
3840 for (i = 0; i < htab->root.table.size; i++)
3842 struct bfd_hash_entry *p;
3843 struct elf_link_hash_entry *h;
3845 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3847 memcpy (old_ent, p, htab->root.table.entsize);
3848 old_ent = (char *) old_ent + htab->root.table.entsize;
3849 h = (struct elf_link_hash_entry *) p;
3850 if (h->root.type == bfd_link_hash_warning)
3852 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3853 old_ent = (char *) old_ent + htab->root.table.entsize;
3860 ever = extversym != NULL ? extversym + extsymoff : NULL;
3861 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3863 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3867 asection *sec, *new_sec;
3870 struct elf_link_hash_entry *h;
3871 bfd_boolean definition;
3872 bfd_boolean size_change_ok;
3873 bfd_boolean type_change_ok;
3874 bfd_boolean new_weakdef;
3875 bfd_boolean override;
3877 unsigned int old_alignment;
3879 bfd * undef_bfd = NULL;
3883 flags = BSF_NO_FLAGS;
3885 value = isym->st_value;
3887 common = bed->common_definition (isym);
3889 bind = ELF_ST_BIND (isym->st_info);
3893 /* This should be impossible, since ELF requires that all
3894 global symbols follow all local symbols, and that sh_info
3895 point to the first global symbol. Unfortunately, Irix 5
3900 if (isym->st_shndx != SHN_UNDEF && !common)
3908 case STB_GNU_UNIQUE:
3909 flags = BSF_GNU_UNIQUE;
3913 /* Leave it up to the processor backend. */
3917 if (isym->st_shndx == SHN_UNDEF)
3918 sec = bfd_und_section_ptr;
3919 else if (isym->st_shndx == SHN_ABS)
3920 sec = bfd_abs_section_ptr;
3921 else if (isym->st_shndx == SHN_COMMON)
3923 sec = bfd_com_section_ptr;
3924 /* What ELF calls the size we call the value. What ELF
3925 calls the value we call the alignment. */
3926 value = isym->st_size;
3930 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3932 sec = bfd_abs_section_ptr;
3933 else if (sec->kept_section)
3935 /* Symbols from discarded section are undefined. We keep
3937 sec = bfd_und_section_ptr;
3938 isym->st_shndx = SHN_UNDEF;
3940 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3944 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3947 goto error_free_vers;
3949 if (isym->st_shndx == SHN_COMMON
3950 && (abfd->flags & BFD_PLUGIN) != 0)
3952 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
3956 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
3958 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
3960 goto error_free_vers;
3964 else if (isym->st_shndx == SHN_COMMON
3965 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3966 && !info->relocatable)
3968 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3972 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
3973 | SEC_LINKER_CREATED);
3974 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
3976 goto error_free_vers;
3980 else if (bed->elf_add_symbol_hook)
3982 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3984 goto error_free_vers;
3986 /* The hook function sets the name to NULL if this symbol
3987 should be skipped for some reason. */
3992 /* Sanity check that all possibilities were handled. */
3995 bfd_set_error (bfd_error_bad_value);
3996 goto error_free_vers;
3999 if (bfd_is_und_section (sec)
4000 || bfd_is_com_section (sec))
4005 size_change_ok = FALSE;
4006 type_change_ok = bed->type_change_ok;
4011 if (is_elf_hash_table (htab))
4013 Elf_Internal_Versym iver;
4014 unsigned int vernum = 0;
4017 /* If this is a definition of a symbol which was previously
4018 referenced in a non-weak manner then make a note of the bfd
4019 that contained the reference. This is used if we need to
4020 refer to the source of the reference later on. */
4021 if (! bfd_is_und_section (sec))
4023 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
4026 && h->root.type == bfd_link_hash_undefined
4027 && h->root.u.undef.abfd)
4028 undef_bfd = h->root.u.undef.abfd;
4033 if (info->default_imported_symver)
4034 /* Use the default symbol version created earlier. */
4035 iver.vs_vers = elf_tdata (abfd)->cverdefs;
4040 _bfd_elf_swap_versym_in (abfd, ever, &iver);
4042 vernum = iver.vs_vers & VERSYM_VERSION;
4044 /* If this is a hidden symbol, or if it is not version
4045 1, we append the version name to the symbol name.
4046 However, we do not modify a non-hidden absolute symbol
4047 if it is not a function, because it might be the version
4048 symbol itself. FIXME: What if it isn't? */
4049 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4051 && (!bfd_is_abs_section (sec)
4052 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4055 size_t namelen, verlen, newlen;
4058 if (isym->st_shndx != SHN_UNDEF)
4060 if (vernum > elf_tdata (abfd)->cverdefs)
4062 else if (vernum > 1)
4064 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4070 (*_bfd_error_handler)
4071 (_("%B: %s: invalid version %u (max %d)"),
4073 elf_tdata (abfd)->cverdefs);
4074 bfd_set_error (bfd_error_bad_value);
4075 goto error_free_vers;
4080 /* We cannot simply test for the number of
4081 entries in the VERNEED section since the
4082 numbers for the needed versions do not start
4084 Elf_Internal_Verneed *t;
4087 for (t = elf_tdata (abfd)->verref;
4091 Elf_Internal_Vernaux *a;
4093 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4095 if (a->vna_other == vernum)
4097 verstr = a->vna_nodename;
4106 (*_bfd_error_handler)
4107 (_("%B: %s: invalid needed version %d"),
4108 abfd, name, vernum);
4109 bfd_set_error (bfd_error_bad_value);
4110 goto error_free_vers;
4114 namelen = strlen (name);
4115 verlen = strlen (verstr);
4116 newlen = namelen + verlen + 2;
4117 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4118 && isym->st_shndx != SHN_UNDEF)
4121 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4122 if (newname == NULL)
4123 goto error_free_vers;
4124 memcpy (newname, name, namelen);
4125 p = newname + namelen;
4127 /* If this is a defined non-hidden version symbol,
4128 we add another @ to the name. This indicates the
4129 default version of the symbol. */
4130 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4131 && isym->st_shndx != SHN_UNDEF)
4133 memcpy (p, verstr, verlen + 1);
4138 /* If necessary, make a second attempt to locate the bfd
4139 containing an unresolved, non-weak reference to the
4141 if (! bfd_is_und_section (sec) && undef_bfd == NULL)
4143 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
4146 && h->root.type == bfd_link_hash_undefined
4147 && h->root.u.undef.abfd)
4148 undef_bfd = h->root.u.undef.abfd;
4151 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec,
4152 &value, &old_alignment,
4153 sym_hash, &skip, &override,
4154 &type_change_ok, &size_change_ok))
4155 goto error_free_vers;
4164 while (h->root.type == bfd_link_hash_indirect
4165 || h->root.type == bfd_link_hash_warning)
4166 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4168 /* Remember the old alignment if this is a common symbol, so
4169 that we don't reduce the alignment later on. We can't
4170 check later, because _bfd_generic_link_add_one_symbol
4171 will set a default for the alignment which we want to
4172 override. We also remember the old bfd where the existing
4173 definition comes from. */
4174 switch (h->root.type)
4179 case bfd_link_hash_defined:
4180 case bfd_link_hash_defweak:
4181 old_bfd = h->root.u.def.section->owner;
4184 case bfd_link_hash_common:
4185 old_bfd = h->root.u.c.p->section->owner;
4186 old_alignment = h->root.u.c.p->alignment_power;
4190 if (elf_tdata (abfd)->verdef != NULL
4194 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4197 if (! (_bfd_generic_link_add_one_symbol
4198 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4199 (struct bfd_link_hash_entry **) sym_hash)))
4200 goto error_free_vers;
4203 while (h->root.type == bfd_link_hash_indirect
4204 || h->root.type == bfd_link_hash_warning)
4205 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4208 if (is_elf_hash_table (htab))
4209 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4211 new_weakdef = FALSE;
4214 && (flags & BSF_WEAK) != 0
4215 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4216 && is_elf_hash_table (htab)
4217 && h->u.weakdef == NULL)
4219 /* Keep a list of all weak defined non function symbols from
4220 a dynamic object, using the weakdef field. Later in this
4221 function we will set the weakdef field to the correct
4222 value. We only put non-function symbols from dynamic
4223 objects on this list, because that happens to be the only
4224 time we need to know the normal symbol corresponding to a
4225 weak symbol, and the information is time consuming to
4226 figure out. If the weakdef field is not already NULL,
4227 then this symbol was already defined by some previous
4228 dynamic object, and we will be using that previous
4229 definition anyhow. */
4231 h->u.weakdef = weaks;
4236 /* Set the alignment of a common symbol. */
4237 if ((common || bfd_is_com_section (sec))
4238 && h->root.type == bfd_link_hash_common)
4243 align = bfd_log2 (isym->st_value);
4246 /* The new symbol is a common symbol in a shared object.
4247 We need to get the alignment from the section. */
4248 align = new_sec->alignment_power;
4250 if (align > old_alignment)
4251 h->root.u.c.p->alignment_power = align;
4253 h->root.u.c.p->alignment_power = old_alignment;
4256 if (is_elf_hash_table (htab))
4260 /* Check the alignment when a common symbol is involved. This
4261 can change when a common symbol is overridden by a normal
4262 definition or a common symbol is ignored due to the old
4263 normal definition. We need to make sure the maximum
4264 alignment is maintained. */
4265 if ((old_alignment || common)
4266 && h->root.type != bfd_link_hash_common)
4268 unsigned int common_align;
4269 unsigned int normal_align;
4270 unsigned int symbol_align;
4274 symbol_align = ffs (h->root.u.def.value) - 1;
4275 if (h->root.u.def.section->owner != NULL
4276 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4278 normal_align = h->root.u.def.section->alignment_power;
4279 if (normal_align > symbol_align)
4280 normal_align = symbol_align;
4283 normal_align = symbol_align;
4287 common_align = old_alignment;
4288 common_bfd = old_bfd;
4293 common_align = bfd_log2 (isym->st_value);
4295 normal_bfd = old_bfd;
4298 if (normal_align < common_align)
4300 /* PR binutils/2735 */
4301 if (normal_bfd == NULL)
4302 (*_bfd_error_handler)
4303 (_("Warning: alignment %u of common symbol `%s' in %B"
4304 " is greater than the alignment (%u) of its section %A"),
4305 common_bfd, h->root.u.def.section,
4306 1 << common_align, name, 1 << normal_align);
4308 (*_bfd_error_handler)
4309 (_("Warning: alignment %u of symbol `%s' in %B"
4310 " is smaller than %u in %B"),
4311 normal_bfd, common_bfd,
4312 1 << normal_align, name, 1 << common_align);
4316 /* Remember the symbol size if it isn't undefined. */
4317 if ((isym->st_size != 0 && isym->st_shndx != SHN_UNDEF)
4318 && (definition || h->size == 0))
4321 && h->size != isym->st_size
4322 && ! size_change_ok)
4323 (*_bfd_error_handler)
4324 (_("Warning: size of symbol `%s' changed"
4325 " from %lu in %B to %lu in %B"),
4327 name, (unsigned long) h->size,
4328 (unsigned long) isym->st_size);
4330 h->size = isym->st_size;
4333 /* If this is a common symbol, then we always want H->SIZE
4334 to be the size of the common symbol. The code just above
4335 won't fix the size if a common symbol becomes larger. We
4336 don't warn about a size change here, because that is
4337 covered by --warn-common. Allow changed between different
4339 if (h->root.type == bfd_link_hash_common)
4340 h->size = h->root.u.c.size;
4342 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4343 && (definition || h->type == STT_NOTYPE))
4345 unsigned int type = ELF_ST_TYPE (isym->st_info);
4347 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4349 if (type == STT_GNU_IFUNC
4350 && (abfd->flags & DYNAMIC) != 0)
4353 if (h->type != type)
4355 if (h->type != STT_NOTYPE && ! type_change_ok)
4356 (*_bfd_error_handler)
4357 (_("Warning: type of symbol `%s' changed"
4358 " from %d to %d in %B"),
4359 abfd, name, h->type, type);
4365 /* Merge st_other field. */
4366 elf_merge_st_other (abfd, h, isym, definition, dynamic);
4368 /* Set a flag in the hash table entry indicating the type of
4369 reference or definition we just found. Keep a count of
4370 the number of dynamic symbols we find. A dynamic symbol
4371 is one which is referenced or defined by both a regular
4372 object and a shared object. */
4379 if (bind != STB_WEAK)
4380 h->ref_regular_nonweak = 1;
4392 if (! info->executable
4405 || (h->u.weakdef != NULL
4407 && h->u.weakdef->dynindx != -1))
4411 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4413 /* We don't want to make debug symbol dynamic. */
4417 /* Check to see if we need to add an indirect symbol for
4418 the default name. */
4419 if (definition || h->root.type == bfd_link_hash_common)
4420 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4421 &sec, &value, &dynsym,
4423 goto error_free_vers;
4425 if (definition && !dynamic)
4427 char *p = strchr (name, ELF_VER_CHR);
4428 if (p != NULL && p[1] != ELF_VER_CHR)
4430 /* Queue non-default versions so that .symver x, x@FOO
4431 aliases can be checked. */
4434 amt = ((isymend - isym + 1)
4435 * sizeof (struct elf_link_hash_entry *));
4437 (struct elf_link_hash_entry **) bfd_malloc (amt);
4439 goto error_free_vers;
4441 nondeflt_vers[nondeflt_vers_cnt++] = h;
4445 if (dynsym && h->dynindx == -1)
4447 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4448 goto error_free_vers;
4449 if (h->u.weakdef != NULL
4451 && h->u.weakdef->dynindx == -1)
4453 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4454 goto error_free_vers;
4457 else if (dynsym && h->dynindx != -1)
4458 /* If the symbol already has a dynamic index, but
4459 visibility says it should not be visible, turn it into
4461 switch (ELF_ST_VISIBILITY (h->other))
4465 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4475 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4476 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4479 const char *soname = elf_dt_name (abfd);
4481 /* A symbol from a library loaded via DT_NEEDED of some
4482 other library is referenced by a regular object.
4483 Add a DT_NEEDED entry for it. Issue an error if
4484 --no-add-needed is used and the reference was not
4486 if (undef_bfd != NULL
4487 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4489 (*_bfd_error_handler)
4490 (_("%B: undefined reference to symbol '%s'"),
4492 (*_bfd_error_handler)
4493 (_("note: '%s' is defined in DSO %B so try adding it to the linker command line"),
4495 bfd_set_error (bfd_error_invalid_operation);
4496 goto error_free_vers;
4499 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4500 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4503 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4505 goto error_free_vers;
4507 BFD_ASSERT (ret == 0);
4512 if (extversym != NULL)
4518 if (isymbuf != NULL)
4524 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4528 /* Restore the symbol table. */
4529 if (bed->as_needed_cleanup)
4530 (*bed->as_needed_cleanup) (abfd, info);
4531 old_hash = (char *) old_tab + tabsize;
4532 old_ent = (char *) old_hash + hashsize;
4533 sym_hash = elf_sym_hashes (abfd);
4534 htab->root.table.table = old_table;
4535 htab->root.table.size = old_size;
4536 htab->root.table.count = old_count;
4537 memcpy (htab->root.table.table, old_tab, tabsize);
4538 memcpy (sym_hash, old_hash, hashsize);
4539 htab->root.undefs = old_undefs;
4540 htab->root.undefs_tail = old_undefs_tail;
4541 for (i = 0; i < htab->root.table.size; i++)
4543 struct bfd_hash_entry *p;
4544 struct elf_link_hash_entry *h;
4546 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4548 h = (struct elf_link_hash_entry *) p;
4549 if (h->root.type == bfd_link_hash_warning)
4550 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4551 if (h->dynindx >= old_dynsymcount)
4552 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4554 memcpy (p, old_ent, htab->root.table.entsize);
4555 old_ent = (char *) old_ent + htab->root.table.entsize;
4556 h = (struct elf_link_hash_entry *) p;
4557 if (h->root.type == bfd_link_hash_warning)
4559 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4560 old_ent = (char *) old_ent + htab->root.table.entsize;
4565 /* Make a special call to the linker "notice" function to
4566 tell it that symbols added for crefs may need to be removed. */
4567 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4568 notice_not_needed, 0, NULL))
4569 goto error_free_vers;
4572 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4574 if (nondeflt_vers != NULL)
4575 free (nondeflt_vers);
4579 if (old_tab != NULL)
4581 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4582 notice_needed, 0, NULL))
4583 goto error_free_vers;
4588 /* Now that all the symbols from this input file are created, handle
4589 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4590 if (nondeflt_vers != NULL)
4592 bfd_size_type cnt, symidx;
4594 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4596 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4597 char *shortname, *p;
4599 p = strchr (h->root.root.string, ELF_VER_CHR);
4601 || (h->root.type != bfd_link_hash_defined
4602 && h->root.type != bfd_link_hash_defweak))
4605 amt = p - h->root.root.string;
4606 shortname = (char *) bfd_malloc (amt + 1);
4608 goto error_free_vers;
4609 memcpy (shortname, h->root.root.string, amt);
4610 shortname[amt] = '\0';
4612 hi = (struct elf_link_hash_entry *)
4613 bfd_link_hash_lookup (&htab->root, shortname,
4614 FALSE, FALSE, FALSE);
4616 && hi->root.type == h->root.type
4617 && hi->root.u.def.value == h->root.u.def.value
4618 && hi->root.u.def.section == h->root.u.def.section)
4620 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4621 hi->root.type = bfd_link_hash_indirect;
4622 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4623 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4624 sym_hash = elf_sym_hashes (abfd);
4626 for (symidx = 0; symidx < extsymcount; ++symidx)
4627 if (sym_hash[symidx] == hi)
4629 sym_hash[symidx] = h;
4635 free (nondeflt_vers);
4636 nondeflt_vers = NULL;
4639 /* Now set the weakdefs field correctly for all the weak defined
4640 symbols we found. The only way to do this is to search all the
4641 symbols. Since we only need the information for non functions in
4642 dynamic objects, that's the only time we actually put anything on
4643 the list WEAKS. We need this information so that if a regular
4644 object refers to a symbol defined weakly in a dynamic object, the
4645 real symbol in the dynamic object is also put in the dynamic
4646 symbols; we also must arrange for both symbols to point to the
4647 same memory location. We could handle the general case of symbol
4648 aliasing, but a general symbol alias can only be generated in
4649 assembler code, handling it correctly would be very time
4650 consuming, and other ELF linkers don't handle general aliasing
4654 struct elf_link_hash_entry **hpp;
4655 struct elf_link_hash_entry **hppend;
4656 struct elf_link_hash_entry **sorted_sym_hash;
4657 struct elf_link_hash_entry *h;
4660 /* Since we have to search the whole symbol list for each weak
4661 defined symbol, search time for N weak defined symbols will be
4662 O(N^2). Binary search will cut it down to O(NlogN). */
4663 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4664 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4665 if (sorted_sym_hash == NULL)
4667 sym_hash = sorted_sym_hash;
4668 hpp = elf_sym_hashes (abfd);
4669 hppend = hpp + extsymcount;
4671 for (; hpp < hppend; hpp++)
4675 && h->root.type == bfd_link_hash_defined
4676 && !bed->is_function_type (h->type))
4684 qsort (sorted_sym_hash, sym_count,
4685 sizeof (struct elf_link_hash_entry *),
4688 while (weaks != NULL)
4690 struct elf_link_hash_entry *hlook;
4697 weaks = hlook->u.weakdef;
4698 hlook->u.weakdef = NULL;
4700 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4701 || hlook->root.type == bfd_link_hash_defweak
4702 || hlook->root.type == bfd_link_hash_common
4703 || hlook->root.type == bfd_link_hash_indirect);
4704 slook = hlook->root.u.def.section;
4705 vlook = hlook->root.u.def.value;
4712 bfd_signed_vma vdiff;
4714 h = sorted_sym_hash [idx];
4715 vdiff = vlook - h->root.u.def.value;
4722 long sdiff = slook->id - h->root.u.def.section->id;
4735 /* We didn't find a value/section match. */
4739 for (i = ilook; i < sym_count; i++)
4741 h = sorted_sym_hash [i];
4743 /* Stop if value or section doesn't match. */
4744 if (h->root.u.def.value != vlook
4745 || h->root.u.def.section != slook)
4747 else if (h != hlook)
4749 hlook->u.weakdef = h;
4751 /* If the weak definition is in the list of dynamic
4752 symbols, make sure the real definition is put
4754 if (hlook->dynindx != -1 && h->dynindx == -1)
4756 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4759 free (sorted_sym_hash);
4764 /* If the real definition is in the list of dynamic
4765 symbols, make sure the weak definition is put
4766 there as well. If we don't do this, then the
4767 dynamic loader might not merge the entries for the
4768 real definition and the weak definition. */
4769 if (h->dynindx != -1 && hlook->dynindx == -1)
4771 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4772 goto err_free_sym_hash;
4779 free (sorted_sym_hash);
4782 if (bed->check_directives
4783 && !(*bed->check_directives) (abfd, info))
4786 /* If this object is the same format as the output object, and it is
4787 not a shared library, then let the backend look through the
4790 This is required to build global offset table entries and to
4791 arrange for dynamic relocs. It is not required for the
4792 particular common case of linking non PIC code, even when linking
4793 against shared libraries, but unfortunately there is no way of
4794 knowing whether an object file has been compiled PIC or not.
4795 Looking through the relocs is not particularly time consuming.
4796 The problem is that we must either (1) keep the relocs in memory,
4797 which causes the linker to require additional runtime memory or
4798 (2) read the relocs twice from the input file, which wastes time.
4799 This would be a good case for using mmap.
4801 I have no idea how to handle linking PIC code into a file of a
4802 different format. It probably can't be done. */
4804 && is_elf_hash_table (htab)
4805 && bed->check_relocs != NULL
4806 && elf_object_id (abfd) == elf_hash_table_id (htab)
4807 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4811 for (o = abfd->sections; o != NULL; o = o->next)
4813 Elf_Internal_Rela *internal_relocs;
4816 if ((o->flags & SEC_RELOC) == 0
4817 || o->reloc_count == 0
4818 || ((info->strip == strip_all || info->strip == strip_debugger)
4819 && (o->flags & SEC_DEBUGGING) != 0)
4820 || bfd_is_abs_section (o->output_section))
4823 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4825 if (internal_relocs == NULL)
4828 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4830 if (elf_section_data (o)->relocs != internal_relocs)
4831 free (internal_relocs);
4838 /* If this is a non-traditional link, try to optimize the handling
4839 of the .stab/.stabstr sections. */
4841 && ! info->traditional_format
4842 && is_elf_hash_table (htab)
4843 && (info->strip != strip_all && info->strip != strip_debugger))
4847 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4848 if (stabstr != NULL)
4850 bfd_size_type string_offset = 0;
4853 for (stab = abfd->sections; stab; stab = stab->next)
4854 if (CONST_STRNEQ (stab->name, ".stab")
4855 && (!stab->name[5] ||
4856 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4857 && (stab->flags & SEC_MERGE) == 0
4858 && !bfd_is_abs_section (stab->output_section))
4860 struct bfd_elf_section_data *secdata;
4862 secdata = elf_section_data (stab);
4863 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4864 stabstr, &secdata->sec_info,
4867 if (secdata->sec_info)
4868 stab->sec_info_type = ELF_INFO_TYPE_STABS;
4873 if (is_elf_hash_table (htab) && add_needed)
4875 /* Add this bfd to the loaded list. */
4876 struct elf_link_loaded_list *n;
4878 n = (struct elf_link_loaded_list *)
4879 bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4883 n->next = htab->loaded;
4890 if (old_tab != NULL)
4892 if (nondeflt_vers != NULL)
4893 free (nondeflt_vers);
4894 if (extversym != NULL)
4897 if (isymbuf != NULL)
4903 /* Return the linker hash table entry of a symbol that might be
4904 satisfied by an archive symbol. Return -1 on error. */
4906 struct elf_link_hash_entry *
4907 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4908 struct bfd_link_info *info,
4911 struct elf_link_hash_entry *h;
4915 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
4919 /* If this is a default version (the name contains @@), look up the
4920 symbol again with only one `@' as well as without the version.
4921 The effect is that references to the symbol with and without the
4922 version will be matched by the default symbol in the archive. */
4924 p = strchr (name, ELF_VER_CHR);
4925 if (p == NULL || p[1] != ELF_VER_CHR)
4928 /* First check with only one `@'. */
4929 len = strlen (name);
4930 copy = (char *) bfd_alloc (abfd, len);
4932 return (struct elf_link_hash_entry *) 0 - 1;
4934 first = p - name + 1;
4935 memcpy (copy, name, first);
4936 memcpy (copy + first, name + first + 1, len - first);
4938 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, FALSE);
4941 /* We also need to check references to the symbol without the
4943 copy[first - 1] = '\0';
4944 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4945 FALSE, FALSE, FALSE);
4948 bfd_release (abfd, copy);
4952 /* Add symbols from an ELF archive file to the linker hash table. We
4953 don't use _bfd_generic_link_add_archive_symbols because of a
4954 problem which arises on UnixWare. The UnixWare libc.so is an
4955 archive which includes an entry libc.so.1 which defines a bunch of
4956 symbols. The libc.so archive also includes a number of other
4957 object files, which also define symbols, some of which are the same
4958 as those defined in libc.so.1. Correct linking requires that we
4959 consider each object file in turn, and include it if it defines any
4960 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4961 this; it looks through the list of undefined symbols, and includes
4962 any object file which defines them. When this algorithm is used on
4963 UnixWare, it winds up pulling in libc.so.1 early and defining a
4964 bunch of symbols. This means that some of the other objects in the
4965 archive are not included in the link, which is incorrect since they
4966 precede libc.so.1 in the archive.
4968 Fortunately, ELF archive handling is simpler than that done by
4969 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4970 oddities. In ELF, if we find a symbol in the archive map, and the
4971 symbol is currently undefined, we know that we must pull in that
4974 Unfortunately, we do have to make multiple passes over the symbol
4975 table until nothing further is resolved. */
4978 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4981 bfd_boolean *defined = NULL;
4982 bfd_boolean *included = NULL;
4986 const struct elf_backend_data *bed;
4987 struct elf_link_hash_entry * (*archive_symbol_lookup)
4988 (bfd *, struct bfd_link_info *, const char *);
4990 if (! bfd_has_map (abfd))
4992 /* An empty archive is a special case. */
4993 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4995 bfd_set_error (bfd_error_no_armap);
4999 /* Keep track of all symbols we know to be already defined, and all
5000 files we know to be already included. This is to speed up the
5001 second and subsequent passes. */
5002 c = bfd_ardata (abfd)->symdef_count;
5006 amt *= sizeof (bfd_boolean);
5007 defined = (bfd_boolean *) bfd_zmalloc (amt);
5008 included = (bfd_boolean *) bfd_zmalloc (amt);
5009 if (defined == NULL || included == NULL)
5012 symdefs = bfd_ardata (abfd)->symdefs;
5013 bed = get_elf_backend_data (abfd);
5014 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5027 symdefend = symdef + c;
5028 for (i = 0; symdef < symdefend; symdef++, i++)
5030 struct elf_link_hash_entry *h;
5032 struct bfd_link_hash_entry *undefs_tail;
5035 if (defined[i] || included[i])
5037 if (symdef->file_offset == last)
5043 h = archive_symbol_lookup (abfd, info, symdef->name);
5044 if (h == (struct elf_link_hash_entry *) 0 - 1)
5050 if (h->root.type == bfd_link_hash_common)
5052 /* We currently have a common symbol. The archive map contains
5053 a reference to this symbol, so we may want to include it. We
5054 only want to include it however, if this archive element
5055 contains a definition of the symbol, not just another common
5058 Unfortunately some archivers (including GNU ar) will put
5059 declarations of common symbols into their archive maps, as
5060 well as real definitions, so we cannot just go by the archive
5061 map alone. Instead we must read in the element's symbol
5062 table and check that to see what kind of symbol definition
5064 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5067 else if (h->root.type != bfd_link_hash_undefined)
5069 if (h->root.type != bfd_link_hash_undefweak)
5074 /* We need to include this archive member. */
5075 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5076 if (element == NULL)
5079 if (! bfd_check_format (element, bfd_object))
5082 /* Doublecheck that we have not included this object
5083 already--it should be impossible, but there may be
5084 something wrong with the archive. */
5085 if (element->archive_pass != 0)
5087 bfd_set_error (bfd_error_bad_value);
5090 element->archive_pass = 1;
5092 undefs_tail = info->hash->undefs_tail;
5094 if (!(*info->callbacks
5095 ->add_archive_element) (info, element, symdef->name, &element))
5097 if (!bfd_link_add_symbols (element, info))
5100 /* If there are any new undefined symbols, we need to make
5101 another pass through the archive in order to see whether
5102 they can be defined. FIXME: This isn't perfect, because
5103 common symbols wind up on undefs_tail and because an
5104 undefined symbol which is defined later on in this pass
5105 does not require another pass. This isn't a bug, but it
5106 does make the code less efficient than it could be. */
5107 if (undefs_tail != info->hash->undefs_tail)
5110 /* Look backward to mark all symbols from this object file
5111 which we have already seen in this pass. */
5115 included[mark] = TRUE;
5120 while (symdefs[mark].file_offset == symdef->file_offset);
5122 /* We mark subsequent symbols from this object file as we go
5123 on through the loop. */
5124 last = symdef->file_offset;
5135 if (defined != NULL)
5137 if (included != NULL)
5142 /* Given an ELF BFD, add symbols to the global hash table as
5146 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5148 switch (bfd_get_format (abfd))
5151 return elf_link_add_object_symbols (abfd, info);
5153 return elf_link_add_archive_symbols (abfd, info);
5155 bfd_set_error (bfd_error_wrong_format);
5160 struct hash_codes_info
5162 unsigned long *hashcodes;
5166 /* This function will be called though elf_link_hash_traverse to store
5167 all hash value of the exported symbols in an array. */
5170 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5172 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5178 if (h->root.type == bfd_link_hash_warning)
5179 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5181 /* Ignore indirect symbols. These are added by the versioning code. */
5182 if (h->dynindx == -1)
5185 name = h->root.root.string;
5186 p = strchr (name, ELF_VER_CHR);
5189 alc = (char *) bfd_malloc (p - name + 1);
5195 memcpy (alc, name, p - name);
5196 alc[p - name] = '\0';
5200 /* Compute the hash value. */
5201 ha = bfd_elf_hash (name);
5203 /* Store the found hash value in the array given as the argument. */
5204 *(inf->hashcodes)++ = ha;
5206 /* And store it in the struct so that we can put it in the hash table
5208 h->u.elf_hash_value = ha;
5216 struct collect_gnu_hash_codes
5219 const struct elf_backend_data *bed;
5220 unsigned long int nsyms;
5221 unsigned long int maskbits;
5222 unsigned long int *hashcodes;
5223 unsigned long int *hashval;
5224 unsigned long int *indx;
5225 unsigned long int *counts;
5228 long int min_dynindx;
5229 unsigned long int bucketcount;
5230 unsigned long int symindx;
5231 long int local_indx;
5232 long int shift1, shift2;
5233 unsigned long int mask;
5237 /* This function will be called though elf_link_hash_traverse to store
5238 all hash value of the exported symbols in an array. */
5241 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5243 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5249 if (h->root.type == bfd_link_hash_warning)
5250 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5252 /* Ignore indirect symbols. These are added by the versioning code. */
5253 if (h->dynindx == -1)
5256 /* Ignore also local symbols and undefined symbols. */
5257 if (! (*s->bed->elf_hash_symbol) (h))
5260 name = h->root.root.string;
5261 p = strchr (name, ELF_VER_CHR);
5264 alc = (char *) bfd_malloc (p - name + 1);
5270 memcpy (alc, name, p - name);
5271 alc[p - name] = '\0';
5275 /* Compute the hash value. */
5276 ha = bfd_elf_gnu_hash (name);
5278 /* Store the found hash value in the array for compute_bucket_count,
5279 and also for .dynsym reordering purposes. */
5280 s->hashcodes[s->nsyms] = ha;
5281 s->hashval[h->dynindx] = ha;
5283 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5284 s->min_dynindx = h->dynindx;
5292 /* This function will be called though elf_link_hash_traverse to do
5293 final dynaminc symbol renumbering. */
5296 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5298 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5299 unsigned long int bucket;
5300 unsigned long int val;
5302 if (h->root.type == bfd_link_hash_warning)
5303 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5305 /* Ignore indirect symbols. */
5306 if (h->dynindx == -1)
5309 /* Ignore also local symbols and undefined symbols. */
5310 if (! (*s->bed->elf_hash_symbol) (h))
5312 if (h->dynindx >= s->min_dynindx)
5313 h->dynindx = s->local_indx++;
5317 bucket = s->hashval[h->dynindx] % s->bucketcount;
5318 val = (s->hashval[h->dynindx] >> s->shift1)
5319 & ((s->maskbits >> s->shift1) - 1);
5320 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5322 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5323 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5324 if (s->counts[bucket] == 1)
5325 /* Last element terminates the chain. */
5327 bfd_put_32 (s->output_bfd, val,
5328 s->contents + (s->indx[bucket] - s->symindx) * 4);
5329 --s->counts[bucket];
5330 h->dynindx = s->indx[bucket]++;
5334 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5337 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5339 return !(h->forced_local
5340 || h->root.type == bfd_link_hash_undefined
5341 || h->root.type == bfd_link_hash_undefweak
5342 || ((h->root.type == bfd_link_hash_defined
5343 || h->root.type == bfd_link_hash_defweak)
5344 && h->root.u.def.section->output_section == NULL));
5347 /* Array used to determine the number of hash table buckets to use
5348 based on the number of symbols there are. If there are fewer than
5349 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5350 fewer than 37 we use 17 buckets, and so forth. We never use more
5351 than 32771 buckets. */
5353 static const size_t elf_buckets[] =
5355 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5359 /* Compute bucket count for hashing table. We do not use a static set
5360 of possible tables sizes anymore. Instead we determine for all
5361 possible reasonable sizes of the table the outcome (i.e., the
5362 number of collisions etc) and choose the best solution. The
5363 weighting functions are not too simple to allow the table to grow
5364 without bounds. Instead one of the weighting factors is the size.
5365 Therefore the result is always a good payoff between few collisions
5366 (= short chain lengths) and table size. */
5368 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5369 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5370 unsigned long int nsyms,
5373 size_t best_size = 0;
5374 unsigned long int i;
5376 /* We have a problem here. The following code to optimize the table
5377 size requires an integer type with more the 32 bits. If
5378 BFD_HOST_U_64_BIT is set we know about such a type. */
5379 #ifdef BFD_HOST_U_64_BIT
5384 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5385 bfd *dynobj = elf_hash_table (info)->dynobj;
5386 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5387 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5388 unsigned long int *counts;
5390 unsigned int no_improvement_count = 0;
5392 /* Possible optimization parameters: if we have NSYMS symbols we say
5393 that the hashing table must at least have NSYMS/4 and at most
5395 minsize = nsyms / 4;
5398 best_size = maxsize = nsyms * 2;
5403 if ((best_size & 31) == 0)
5407 /* Create array where we count the collisions in. We must use bfd_malloc
5408 since the size could be large. */
5410 amt *= sizeof (unsigned long int);
5411 counts = (unsigned long int *) bfd_malloc (amt);
5415 /* Compute the "optimal" size for the hash table. The criteria is a
5416 minimal chain length. The minor criteria is (of course) the size
5418 for (i = minsize; i < maxsize; ++i)
5420 /* Walk through the array of hashcodes and count the collisions. */
5421 BFD_HOST_U_64_BIT max;
5422 unsigned long int j;
5423 unsigned long int fact;
5425 if (gnu_hash && (i & 31) == 0)
5428 memset (counts, '\0', i * sizeof (unsigned long int));
5430 /* Determine how often each hash bucket is used. */
5431 for (j = 0; j < nsyms; ++j)
5432 ++counts[hashcodes[j] % i];
5434 /* For the weight function we need some information about the
5435 pagesize on the target. This is information need not be 100%
5436 accurate. Since this information is not available (so far) we
5437 define it here to a reasonable default value. If it is crucial
5438 to have a better value some day simply define this value. */
5439 # ifndef BFD_TARGET_PAGESIZE
5440 # define BFD_TARGET_PAGESIZE (4096)
5443 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5445 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5448 /* Variant 1: optimize for short chains. We add the squares
5449 of all the chain lengths (which favors many small chain
5450 over a few long chains). */
5451 for (j = 0; j < i; ++j)
5452 max += counts[j] * counts[j];
5454 /* This adds penalties for the overall size of the table. */
5455 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5458 /* Variant 2: Optimize a lot more for small table. Here we
5459 also add squares of the size but we also add penalties for
5460 empty slots (the +1 term). */
5461 for (j = 0; j < i; ++j)
5462 max += (1 + counts[j]) * (1 + counts[j]);
5464 /* The overall size of the table is considered, but not as
5465 strong as in variant 1, where it is squared. */
5466 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5470 /* Compare with current best results. */
5471 if (max < best_chlen)
5475 no_improvement_count = 0;
5477 /* PR 11843: Avoid futile long searches for the best bucket size
5478 when there are a large number of symbols. */
5479 else if (++no_improvement_count == 100)
5486 #endif /* defined (BFD_HOST_U_64_BIT) */
5488 /* This is the fallback solution if no 64bit type is available or if we
5489 are not supposed to spend much time on optimizations. We select the
5490 bucket count using a fixed set of numbers. */
5491 for (i = 0; elf_buckets[i] != 0; i++)
5493 best_size = elf_buckets[i];
5494 if (nsyms < elf_buckets[i + 1])
5497 if (gnu_hash && best_size < 2)
5504 /* Size any SHT_GROUP section for ld -r. */
5507 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5511 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
5512 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5513 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5518 /* Set up the sizes and contents of the ELF dynamic sections. This is
5519 called by the ELF linker emulation before_allocation routine. We
5520 must set the sizes of the sections before the linker sets the
5521 addresses of the various sections. */
5524 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5527 const char *filter_shlib,
5529 const char *depaudit,
5530 const char * const *auxiliary_filters,
5531 struct bfd_link_info *info,
5532 asection **sinterpptr,
5533 struct bfd_elf_version_tree *verdefs)
5535 bfd_size_type soname_indx;
5537 const struct elf_backend_data *bed;
5538 struct elf_info_failed asvinfo;
5542 soname_indx = (bfd_size_type) -1;
5544 if (!is_elf_hash_table (info->hash))
5547 bed = get_elf_backend_data (output_bfd);
5548 if (info->execstack)
5549 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
5550 else if (info->noexecstack)
5551 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W;
5555 asection *notesec = NULL;
5558 for (inputobj = info->input_bfds;
5560 inputobj = inputobj->link_next)
5564 if (inputobj->flags & (DYNAMIC | EXEC_P | BFD_LINKER_CREATED))
5566 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5569 if (s->flags & SEC_CODE)
5573 else if (bed->default_execstack)
5578 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec;
5579 if (exec && info->relocatable
5580 && notesec->output_section != bfd_abs_section_ptr)
5581 notesec->output_section->flags |= SEC_CODE;
5585 /* Any syms created from now on start with -1 in
5586 got.refcount/offset and plt.refcount/offset. */
5587 elf_hash_table (info)->init_got_refcount
5588 = elf_hash_table (info)->init_got_offset;
5589 elf_hash_table (info)->init_plt_refcount
5590 = elf_hash_table (info)->init_plt_offset;
5592 if (info->relocatable
5593 && !_bfd_elf_size_group_sections (info))
5596 /* The backend may have to create some sections regardless of whether
5597 we're dynamic or not. */
5598 if (bed->elf_backend_always_size_sections
5599 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5602 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5605 dynobj = elf_hash_table (info)->dynobj;
5607 /* If there were no dynamic objects in the link, there is nothing to
5612 if (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_section_by_name (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;
5645 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5647 if (indx == (bfd_size_type) -1
5648 || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))
5651 if (info->new_dtags)
5653 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
5654 if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx))
5659 if (filter_shlib != NULL)
5663 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5664 filter_shlib, TRUE);
5665 if (indx == (bfd_size_type) -1
5666 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5670 if (auxiliary_filters != NULL)
5672 const char * const *p;
5674 for (p = auxiliary_filters; *p != NULL; p++)
5678 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5680 if (indx == (bfd_size_type) -1
5681 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5690 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5692 if (indx == (bfd_size_type) -1
5693 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5697 if (depaudit != NULL)
5701 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5703 if (indx == (bfd_size_type) -1
5704 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5709 eif.verdefs = verdefs;
5712 /* If we are supposed to export all symbols into the dynamic symbol
5713 table (this is not the normal case), then do so. */
5714 if (info->export_dynamic
5715 || (info->executable && info->dynamic))
5717 elf_link_hash_traverse (elf_hash_table (info),
5718 _bfd_elf_export_symbol,
5724 /* Make all global versions with definition. */
5725 for (t = verdefs; t != NULL; t = t->next)
5726 for (d = t->globals.list; d != NULL; d = d->next)
5727 if (!d->symver && d->literal)
5729 const char *verstr, *name;
5730 size_t namelen, verlen, newlen;
5731 char *newname, *p, leading_char;
5732 struct elf_link_hash_entry *newh;
5734 leading_char = bfd_get_symbol_leading_char (output_bfd);
5736 namelen = strlen (name) + (leading_char != '\0');
5738 verlen = strlen (verstr);
5739 newlen = namelen + verlen + 3;
5741 newname = (char *) bfd_malloc (newlen);
5742 if (newname == NULL)
5744 newname[0] = leading_char;
5745 memcpy (newname + (leading_char != '\0'), name, namelen);
5747 /* Check the hidden versioned definition. */
5748 p = newname + namelen;
5750 memcpy (p, verstr, verlen + 1);
5751 newh = elf_link_hash_lookup (elf_hash_table (info),
5752 newname, FALSE, FALSE,
5755 || (newh->root.type != bfd_link_hash_defined
5756 && newh->root.type != bfd_link_hash_defweak))
5758 /* Check the default versioned definition. */
5760 memcpy (p, verstr, verlen + 1);
5761 newh = elf_link_hash_lookup (elf_hash_table (info),
5762 newname, FALSE, FALSE,
5767 /* Mark this version if there is a definition and it is
5768 not defined in a shared object. */
5770 && !newh->def_dynamic
5771 && (newh->root.type == bfd_link_hash_defined
5772 || newh->root.type == bfd_link_hash_defweak))
5776 /* Attach all the symbols to their version information. */
5777 asvinfo.info = info;
5778 asvinfo.verdefs = verdefs;
5779 asvinfo.failed = FALSE;
5781 elf_link_hash_traverse (elf_hash_table (info),
5782 _bfd_elf_link_assign_sym_version,
5787 if (!info->allow_undefined_version)
5789 /* Check if all global versions have a definition. */
5791 for (t = verdefs; t != NULL; t = t->next)
5792 for (d = t->globals.list; d != NULL; d = d->next)
5793 if (d->literal && !d->symver && !d->script)
5795 (*_bfd_error_handler)
5796 (_("%s: undefined version: %s"),
5797 d->pattern, t->name);
5798 all_defined = FALSE;
5803 bfd_set_error (bfd_error_bad_value);
5808 /* Find all symbols which were defined in a dynamic object and make
5809 the backend pick a reasonable value for them. */
5810 elf_link_hash_traverse (elf_hash_table (info),
5811 _bfd_elf_adjust_dynamic_symbol,
5816 /* Add some entries to the .dynamic section. We fill in some of the
5817 values later, in bfd_elf_final_link, but we must add the entries
5818 now so that we know the final size of the .dynamic section. */
5820 /* If there are initialization and/or finalization functions to
5821 call then add the corresponding DT_INIT/DT_FINI entries. */
5822 h = (info->init_function
5823 ? elf_link_hash_lookup (elf_hash_table (info),
5824 info->init_function, FALSE,
5831 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5834 h = (info->fini_function
5835 ? elf_link_hash_lookup (elf_hash_table (info),
5836 info->fini_function, FALSE,
5843 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5847 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5848 if (s != NULL && s->linker_has_input)
5850 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5851 if (! info->executable)
5856 for (sub = info->input_bfds; sub != NULL;
5857 sub = sub->link_next)
5858 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5859 for (o = sub->sections; o != NULL; o = o->next)
5860 if (elf_section_data (o)->this_hdr.sh_type
5861 == SHT_PREINIT_ARRAY)
5863 (*_bfd_error_handler)
5864 (_("%B: .preinit_array section is not allowed in DSO"),
5869 bfd_set_error (bfd_error_nonrepresentable_section);
5873 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5874 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5877 s = bfd_get_section_by_name (output_bfd, ".init_array");
5878 if (s != NULL && s->linker_has_input)
5880 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5881 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5884 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5885 if (s != NULL && s->linker_has_input)
5887 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5888 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5892 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
5893 /* If .dynstr is excluded from the link, we don't want any of
5894 these tags. Strictly, we should be checking each section
5895 individually; This quick check covers for the case where
5896 someone does a /DISCARD/ : { *(*) }. */
5897 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5899 bfd_size_type strsize;
5901 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5902 if ((info->emit_hash
5903 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5904 || (info->emit_gnu_hash
5905 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5906 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5907 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5908 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5909 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5910 bed->s->sizeof_sym))
5915 /* The backend must work out the sizes of all the other dynamic
5917 if (bed->elf_backend_size_dynamic_sections
5918 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5921 if (elf_hash_table (info)->dynamic_sections_created)
5923 unsigned long section_sym_count;
5926 /* Set up the version definition section. */
5927 s = bfd_get_section_by_name (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 = asvinfo.verdefs;
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_section_by_name (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_section_by_name (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_section_by_name (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_section_by_name (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_section_by_name (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_section_by_name (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_section_by_name (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 /* Indicate that we are only retrieving symbol values from this
6665 _bfd_elf_link_just_syms (asection *sec, struct bfd_link_info *info)
6667 if (is_elf_hash_table (info->hash))
6668 sec->sec_info_type = ELF_INFO_TYPE_JUST_SYMS;
6669 _bfd_generic_link_just_syms (sec, info);
6672 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6675 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6678 BFD_ASSERT (sec->sec_info_type == ELF_INFO_TYPE_MERGE);
6679 sec->sec_info_type = ELF_INFO_TYPE_NONE;
6682 /* Finish SHF_MERGE section merging. */
6685 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6690 if (!is_elf_hash_table (info->hash))
6693 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6694 if ((ibfd->flags & DYNAMIC) == 0)
6695 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6696 if ((sec->flags & SEC_MERGE) != 0
6697 && !bfd_is_abs_section (sec->output_section))
6699 struct bfd_elf_section_data *secdata;
6701 secdata = elf_section_data (sec);
6702 if (! _bfd_add_merge_section (abfd,
6703 &elf_hash_table (info)->merge_info,
6704 sec, &secdata->sec_info))
6706 else if (secdata->sec_info)
6707 sec->sec_info_type = ELF_INFO_TYPE_MERGE;
6710 if (elf_hash_table (info)->merge_info != NULL)
6711 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6712 merge_sections_remove_hook);
6716 /* Create an entry in an ELF linker hash table. */
6718 struct bfd_hash_entry *
6719 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6720 struct bfd_hash_table *table,
6723 /* Allocate the structure if it has not already been allocated by a
6727 entry = (struct bfd_hash_entry *)
6728 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6733 /* Call the allocation method of the superclass. */
6734 entry = _bfd_link_hash_newfunc (entry, table, string);
6737 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6738 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6740 /* Set local fields. */
6743 ret->got = htab->init_got_refcount;
6744 ret->plt = htab->init_plt_refcount;
6745 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6746 - offsetof (struct elf_link_hash_entry, size)));
6747 /* Assume that we have been called by a non-ELF symbol reader.
6748 This flag is then reset by the code which reads an ELF input
6749 file. This ensures that a symbol created by a non-ELF symbol
6750 reader will have the flag set correctly. */
6757 /* Copy data from an indirect symbol to its direct symbol, hiding the
6758 old indirect symbol. Also used for copying flags to a weakdef. */
6761 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6762 struct elf_link_hash_entry *dir,
6763 struct elf_link_hash_entry *ind)
6765 struct elf_link_hash_table *htab;
6767 /* Copy down any references that we may have already seen to the
6768 symbol which just became indirect. */
6770 dir->ref_dynamic |= ind->ref_dynamic;
6771 dir->ref_regular |= ind->ref_regular;
6772 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6773 dir->non_got_ref |= ind->non_got_ref;
6774 dir->needs_plt |= ind->needs_plt;
6775 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6777 if (ind->root.type != bfd_link_hash_indirect)
6780 /* Copy over the global and procedure linkage table refcount entries.
6781 These may have been already set up by a check_relocs routine. */
6782 htab = elf_hash_table (info);
6783 if (ind->got.refcount > htab->init_got_refcount.refcount)
6785 if (dir->got.refcount < 0)
6786 dir->got.refcount = 0;
6787 dir->got.refcount += ind->got.refcount;
6788 ind->got.refcount = htab->init_got_refcount.refcount;
6791 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6793 if (dir->plt.refcount < 0)
6794 dir->plt.refcount = 0;
6795 dir->plt.refcount += ind->plt.refcount;
6796 ind->plt.refcount = htab->init_plt_refcount.refcount;
6799 if (ind->dynindx != -1)
6801 if (dir->dynindx != -1)
6802 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6803 dir->dynindx = ind->dynindx;
6804 dir->dynstr_index = ind->dynstr_index;
6806 ind->dynstr_index = 0;
6811 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6812 struct elf_link_hash_entry *h,
6813 bfd_boolean force_local)
6815 /* STT_GNU_IFUNC symbol must go through PLT. */
6816 if (h->type != STT_GNU_IFUNC)
6818 h->plt = elf_hash_table (info)->init_plt_offset;
6823 h->forced_local = 1;
6824 if (h->dynindx != -1)
6827 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6833 /* Initialize an ELF linker hash table. */
6836 _bfd_elf_link_hash_table_init
6837 (struct elf_link_hash_table *table,
6839 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6840 struct bfd_hash_table *,
6842 unsigned int entsize,
6843 enum elf_target_id target_id)
6846 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6848 memset (table, 0, sizeof * table);
6849 table->init_got_refcount.refcount = can_refcount - 1;
6850 table->init_plt_refcount.refcount = can_refcount - 1;
6851 table->init_got_offset.offset = -(bfd_vma) 1;
6852 table->init_plt_offset.offset = -(bfd_vma) 1;
6853 /* The first dynamic symbol is a dummy. */
6854 table->dynsymcount = 1;
6856 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6858 table->root.type = bfd_link_elf_hash_table;
6859 table->hash_table_id = target_id;
6864 /* Create an ELF linker hash table. */
6866 struct bfd_link_hash_table *
6867 _bfd_elf_link_hash_table_create (bfd *abfd)
6869 struct elf_link_hash_table *ret;
6870 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6872 ret = (struct elf_link_hash_table *) bfd_malloc (amt);
6876 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6877 sizeof (struct elf_link_hash_entry),
6887 /* This is a hook for the ELF emulation code in the generic linker to
6888 tell the backend linker what file name to use for the DT_NEEDED
6889 entry for a dynamic object. */
6892 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6894 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6895 && bfd_get_format (abfd) == bfd_object)
6896 elf_dt_name (abfd) = name;
6900 bfd_elf_get_dyn_lib_class (bfd *abfd)
6903 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6904 && bfd_get_format (abfd) == bfd_object)
6905 lib_class = elf_dyn_lib_class (abfd);
6912 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6914 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6915 && bfd_get_format (abfd) == bfd_object)
6916 elf_dyn_lib_class (abfd) = lib_class;
6919 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6920 the linker ELF emulation code. */
6922 struct bfd_link_needed_list *
6923 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6924 struct bfd_link_info *info)
6926 if (! is_elf_hash_table (info->hash))
6928 return elf_hash_table (info)->needed;
6931 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6932 hook for the linker ELF emulation code. */
6934 struct bfd_link_needed_list *
6935 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6936 struct bfd_link_info *info)
6938 if (! is_elf_hash_table (info->hash))
6940 return elf_hash_table (info)->runpath;
6943 /* Get the name actually used for a dynamic object for a link. This
6944 is the SONAME entry if there is one. Otherwise, it is the string
6945 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6948 bfd_elf_get_dt_soname (bfd *abfd)
6950 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6951 && bfd_get_format (abfd) == bfd_object)
6952 return elf_dt_name (abfd);
6956 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6957 the ELF linker emulation code. */
6960 bfd_elf_get_bfd_needed_list (bfd *abfd,
6961 struct bfd_link_needed_list **pneeded)
6964 bfd_byte *dynbuf = NULL;
6965 unsigned int elfsec;
6966 unsigned long shlink;
6967 bfd_byte *extdyn, *extdynend;
6969 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6973 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6974 || bfd_get_format (abfd) != bfd_object)
6977 s = bfd_get_section_by_name (abfd, ".dynamic");
6978 if (s == NULL || s->size == 0)
6981 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6984 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6985 if (elfsec == SHN_BAD)
6988 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6990 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6991 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
6994 extdynend = extdyn + s->size;
6995 for (; extdyn < extdynend; extdyn += extdynsize)
6997 Elf_Internal_Dyn dyn;
6999 (*swap_dyn_in) (abfd, extdyn, &dyn);
7001 if (dyn.d_tag == DT_NULL)
7004 if (dyn.d_tag == DT_NEEDED)
7007 struct bfd_link_needed_list *l;
7008 unsigned int tagv = dyn.d_un.d_val;
7011 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7016 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7037 struct elf_symbuf_symbol
7039 unsigned long st_name; /* Symbol name, index in string tbl */
7040 unsigned char st_info; /* Type and binding attributes */
7041 unsigned char st_other; /* Visibilty, and target specific */
7044 struct elf_symbuf_head
7046 struct elf_symbuf_symbol *ssym;
7047 bfd_size_type count;
7048 unsigned int st_shndx;
7055 Elf_Internal_Sym *isym;
7056 struct elf_symbuf_symbol *ssym;
7061 /* Sort references to symbols by ascending section number. */
7064 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7066 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7067 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7069 return s1->st_shndx - s2->st_shndx;
7073 elf_sym_name_compare (const void *arg1, const void *arg2)
7075 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7076 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7077 return strcmp (s1->name, s2->name);
7080 static struct elf_symbuf_head *
7081 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7083 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7084 struct elf_symbuf_symbol *ssym;
7085 struct elf_symbuf_head *ssymbuf, *ssymhead;
7086 bfd_size_type i, shndx_count, total_size;
7088 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7092 for (ind = indbuf, i = 0; i < symcount; i++)
7093 if (isymbuf[i].st_shndx != SHN_UNDEF)
7094 *ind++ = &isymbuf[i];
7097 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7098 elf_sort_elf_symbol);
7101 if (indbufend > indbuf)
7102 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7103 if (ind[0]->st_shndx != ind[1]->st_shndx)
7106 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7107 + (indbufend - indbuf) * sizeof (*ssym));
7108 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7109 if (ssymbuf == NULL)
7115 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7116 ssymbuf->ssym = NULL;
7117 ssymbuf->count = shndx_count;
7118 ssymbuf->st_shndx = 0;
7119 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7121 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7124 ssymhead->ssym = ssym;
7125 ssymhead->count = 0;
7126 ssymhead->st_shndx = (*ind)->st_shndx;
7128 ssym->st_name = (*ind)->st_name;
7129 ssym->st_info = (*ind)->st_info;
7130 ssym->st_other = (*ind)->st_other;
7133 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7134 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7141 /* Check if 2 sections define the same set of local and global
7145 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7146 struct bfd_link_info *info)
7149 const struct elf_backend_data *bed1, *bed2;
7150 Elf_Internal_Shdr *hdr1, *hdr2;
7151 bfd_size_type symcount1, symcount2;
7152 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7153 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7154 Elf_Internal_Sym *isym, *isymend;
7155 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7156 bfd_size_type count1, count2, i;
7157 unsigned int shndx1, shndx2;
7163 /* Both sections have to be in ELF. */
7164 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7165 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7168 if (elf_section_type (sec1) != elf_section_type (sec2))
7171 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7172 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7173 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7176 bed1 = get_elf_backend_data (bfd1);
7177 bed2 = get_elf_backend_data (bfd2);
7178 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7179 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7180 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7181 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7183 if (symcount1 == 0 || symcount2 == 0)
7189 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7190 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7192 if (ssymbuf1 == NULL)
7194 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7196 if (isymbuf1 == NULL)
7199 if (!info->reduce_memory_overheads)
7200 elf_tdata (bfd1)->symbuf = ssymbuf1
7201 = elf_create_symbuf (symcount1, isymbuf1);
7204 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7206 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7208 if (isymbuf2 == NULL)
7211 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7212 elf_tdata (bfd2)->symbuf = ssymbuf2
7213 = elf_create_symbuf (symcount2, isymbuf2);
7216 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7218 /* Optimized faster version. */
7219 bfd_size_type lo, hi, mid;
7220 struct elf_symbol *symp;
7221 struct elf_symbuf_symbol *ssym, *ssymend;
7224 hi = ssymbuf1->count;
7229 mid = (lo + hi) / 2;
7230 if (shndx1 < ssymbuf1[mid].st_shndx)
7232 else if (shndx1 > ssymbuf1[mid].st_shndx)
7236 count1 = ssymbuf1[mid].count;
7243 hi = ssymbuf2->count;
7248 mid = (lo + hi) / 2;
7249 if (shndx2 < ssymbuf2[mid].st_shndx)
7251 else if (shndx2 > ssymbuf2[mid].st_shndx)
7255 count2 = ssymbuf2[mid].count;
7261 if (count1 == 0 || count2 == 0 || count1 != count2)
7264 symtable1 = (struct elf_symbol *)
7265 bfd_malloc (count1 * sizeof (struct elf_symbol));
7266 symtable2 = (struct elf_symbol *)
7267 bfd_malloc (count2 * sizeof (struct elf_symbol));
7268 if (symtable1 == NULL || symtable2 == NULL)
7272 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7273 ssym < ssymend; ssym++, symp++)
7275 symp->u.ssym = ssym;
7276 symp->name = bfd_elf_string_from_elf_section (bfd1,
7282 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7283 ssym < ssymend; ssym++, symp++)
7285 symp->u.ssym = ssym;
7286 symp->name = bfd_elf_string_from_elf_section (bfd2,
7291 /* Sort symbol by name. */
7292 qsort (symtable1, count1, sizeof (struct elf_symbol),
7293 elf_sym_name_compare);
7294 qsort (symtable2, count1, sizeof (struct elf_symbol),
7295 elf_sym_name_compare);
7297 for (i = 0; i < count1; i++)
7298 /* Two symbols must have the same binding, type and name. */
7299 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7300 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7301 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7308 symtable1 = (struct elf_symbol *)
7309 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7310 symtable2 = (struct elf_symbol *)
7311 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7312 if (symtable1 == NULL || symtable2 == NULL)
7315 /* Count definitions in the section. */
7317 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7318 if (isym->st_shndx == shndx1)
7319 symtable1[count1++].u.isym = isym;
7322 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7323 if (isym->st_shndx == shndx2)
7324 symtable2[count2++].u.isym = isym;
7326 if (count1 == 0 || count2 == 0 || count1 != count2)
7329 for (i = 0; i < count1; i++)
7331 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7332 symtable1[i].u.isym->st_name);
7334 for (i = 0; i < count2; i++)
7336 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7337 symtable2[i].u.isym->st_name);
7339 /* Sort symbol by name. */
7340 qsort (symtable1, count1, sizeof (struct elf_symbol),
7341 elf_sym_name_compare);
7342 qsort (symtable2, count1, sizeof (struct elf_symbol),
7343 elf_sym_name_compare);
7345 for (i = 0; i < count1; i++)
7346 /* Two symbols must have the same binding, type and name. */
7347 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7348 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7349 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7367 /* Return TRUE if 2 section types are compatible. */
7370 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7371 bfd *bbfd, const asection *bsec)
7375 || abfd->xvec->flavour != bfd_target_elf_flavour
7376 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7379 return elf_section_type (asec) == elf_section_type (bsec);
7382 /* Final phase of ELF linker. */
7384 /* A structure we use to avoid passing large numbers of arguments. */
7386 struct elf_final_link_info
7388 /* General link information. */
7389 struct bfd_link_info *info;
7392 /* Symbol string table. */
7393 struct bfd_strtab_hash *symstrtab;
7394 /* .dynsym section. */
7395 asection *dynsym_sec;
7396 /* .hash section. */
7398 /* symbol version section (.gnu.version). */
7399 asection *symver_sec;
7400 /* Buffer large enough to hold contents of any section. */
7402 /* Buffer large enough to hold external relocs of any section. */
7403 void *external_relocs;
7404 /* Buffer large enough to hold internal relocs of any section. */
7405 Elf_Internal_Rela *internal_relocs;
7406 /* Buffer large enough to hold external local symbols of any input
7408 bfd_byte *external_syms;
7409 /* And a buffer for symbol section indices. */
7410 Elf_External_Sym_Shndx *locsym_shndx;
7411 /* Buffer large enough to hold internal local symbols of any input
7413 Elf_Internal_Sym *internal_syms;
7414 /* Array large enough to hold a symbol index for each local symbol
7415 of any input BFD. */
7417 /* Array large enough to hold a section pointer for each local
7418 symbol of any input BFD. */
7419 asection **sections;
7420 /* Buffer to hold swapped out symbols. */
7422 /* And one for symbol section indices. */
7423 Elf_External_Sym_Shndx *symshndxbuf;
7424 /* Number of swapped out symbols in buffer. */
7425 size_t symbuf_count;
7426 /* Number of symbols which fit in symbuf. */
7428 /* And same for symshndxbuf. */
7429 size_t shndxbuf_size;
7432 /* This struct is used to pass information to elf_link_output_extsym. */
7434 struct elf_outext_info
7437 bfd_boolean localsyms;
7438 struct elf_final_link_info *finfo;
7442 /* Support for evaluating a complex relocation.
7444 Complex relocations are generalized, self-describing relocations. The
7445 implementation of them consists of two parts: complex symbols, and the
7446 relocations themselves.
7448 The relocations are use a reserved elf-wide relocation type code (R_RELC
7449 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7450 information (start bit, end bit, word width, etc) into the addend. This
7451 information is extracted from CGEN-generated operand tables within gas.
7453 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7454 internal) representing prefix-notation expressions, including but not
7455 limited to those sorts of expressions normally encoded as addends in the
7456 addend field. The symbol mangling format is:
7459 | <unary-operator> ':' <node>
7460 | <binary-operator> ':' <node> ':' <node>
7463 <literal> := 's' <digits=N> ':' <N character symbol name>
7464 | 'S' <digits=N> ':' <N character section name>
7468 <binary-operator> := as in C
7469 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7472 set_symbol_value (bfd *bfd_with_globals,
7473 Elf_Internal_Sym *isymbuf,
7478 struct elf_link_hash_entry **sym_hashes;
7479 struct elf_link_hash_entry *h;
7480 size_t extsymoff = locsymcount;
7482 if (symidx < locsymcount)
7484 Elf_Internal_Sym *sym;
7486 sym = isymbuf + symidx;
7487 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7489 /* It is a local symbol: move it to the
7490 "absolute" section and give it a value. */
7491 sym->st_shndx = SHN_ABS;
7492 sym->st_value = val;
7495 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7499 /* It is a global symbol: set its link type
7500 to "defined" and give it a value. */
7502 sym_hashes = elf_sym_hashes (bfd_with_globals);
7503 h = sym_hashes [symidx - extsymoff];
7504 while (h->root.type == bfd_link_hash_indirect
7505 || h->root.type == bfd_link_hash_warning)
7506 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7507 h->root.type = bfd_link_hash_defined;
7508 h->root.u.def.value = val;
7509 h->root.u.def.section = bfd_abs_section_ptr;
7513 resolve_symbol (const char *name,
7515 struct elf_final_link_info *finfo,
7517 Elf_Internal_Sym *isymbuf,
7520 Elf_Internal_Sym *sym;
7521 struct bfd_link_hash_entry *global_entry;
7522 const char *candidate = NULL;
7523 Elf_Internal_Shdr *symtab_hdr;
7526 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7528 for (i = 0; i < locsymcount; ++ i)
7532 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7535 candidate = bfd_elf_string_from_elf_section (input_bfd,
7536 symtab_hdr->sh_link,
7539 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7540 name, candidate, (unsigned long) sym->st_value);
7542 if (candidate && strcmp (candidate, name) == 0)
7544 asection *sec = finfo->sections [i];
7546 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7547 *result += sec->output_offset + sec->output_section->vma;
7549 printf ("Found symbol with value %8.8lx\n",
7550 (unsigned long) *result);
7556 /* Hmm, haven't found it yet. perhaps it is a global. */
7557 global_entry = bfd_link_hash_lookup (finfo->info->hash, name,
7558 FALSE, FALSE, TRUE);
7562 if (global_entry->type == bfd_link_hash_defined
7563 || global_entry->type == bfd_link_hash_defweak)
7565 *result = (global_entry->u.def.value
7566 + global_entry->u.def.section->output_section->vma
7567 + global_entry->u.def.section->output_offset);
7569 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7570 global_entry->root.string, (unsigned long) *result);
7579 resolve_section (const char *name,
7586 for (curr = sections; curr; curr = curr->next)
7587 if (strcmp (curr->name, name) == 0)
7589 *result = curr->vma;
7593 /* Hmm. still haven't found it. try pseudo-section names. */
7594 for (curr = sections; curr; curr = curr->next)
7596 len = strlen (curr->name);
7597 if (len > strlen (name))
7600 if (strncmp (curr->name, name, len) == 0)
7602 if (strncmp (".end", name + len, 4) == 0)
7604 *result = curr->vma + curr->size;
7608 /* Insert more pseudo-section names here, if you like. */
7616 undefined_reference (const char *reftype, const char *name)
7618 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7623 eval_symbol (bfd_vma *result,
7626 struct elf_final_link_info *finfo,
7628 Elf_Internal_Sym *isymbuf,
7637 const char *sym = *symp;
7639 bfd_boolean symbol_is_section = FALSE;
7644 if (len < 1 || len > sizeof (symbuf))
7646 bfd_set_error (bfd_error_invalid_operation);
7659 *result = strtoul (sym, (char **) symp, 16);
7663 symbol_is_section = TRUE;
7666 symlen = strtol (sym, (char **) symp, 10);
7667 sym = *symp + 1; /* Skip the trailing ':'. */
7669 if (symend < sym || symlen + 1 > sizeof (symbuf))
7671 bfd_set_error (bfd_error_invalid_operation);
7675 memcpy (symbuf, sym, symlen);
7676 symbuf[symlen] = '\0';
7677 *symp = sym + symlen;
7679 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7680 the symbol as a section, or vice-versa. so we're pretty liberal in our
7681 interpretation here; section means "try section first", not "must be a
7682 section", and likewise with symbol. */
7684 if (symbol_is_section)
7686 if (!resolve_section (symbuf, finfo->output_bfd->sections, result)
7687 && !resolve_symbol (symbuf, input_bfd, finfo, result,
7688 isymbuf, locsymcount))
7690 undefined_reference ("section", symbuf);
7696 if (!resolve_symbol (symbuf, input_bfd, finfo, result,
7697 isymbuf, locsymcount)
7698 && !resolve_section (symbuf, finfo->output_bfd->sections,
7701 undefined_reference ("symbol", symbuf);
7708 /* All that remains are operators. */
7710 #define UNARY_OP(op) \
7711 if (strncmp (sym, #op, strlen (#op)) == 0) \
7713 sym += strlen (#op); \
7717 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7718 isymbuf, locsymcount, signed_p)) \
7721 *result = op ((bfd_signed_vma) a); \
7727 #define BINARY_OP(op) \
7728 if (strncmp (sym, #op, strlen (#op)) == 0) \
7730 sym += strlen (#op); \
7734 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7735 isymbuf, locsymcount, signed_p)) \
7738 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7739 isymbuf, locsymcount, signed_p)) \
7742 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7772 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7773 bfd_set_error (bfd_error_invalid_operation);
7779 put_value (bfd_vma size,
7780 unsigned long chunksz,
7785 location += (size - chunksz);
7787 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7795 bfd_put_8 (input_bfd, x, location);
7798 bfd_put_16 (input_bfd, x, location);
7801 bfd_put_32 (input_bfd, x, location);
7805 bfd_put_64 (input_bfd, x, location);
7815 get_value (bfd_vma size,
7816 unsigned long chunksz,
7822 for (; size; size -= chunksz, location += chunksz)
7830 x = (x << (8 * chunksz)) | bfd_get_8 (input_bfd, location);
7833 x = (x << (8 * chunksz)) | bfd_get_16 (input_bfd, location);
7836 x = (x << (8 * chunksz)) | bfd_get_32 (input_bfd, location);
7840 x = (x << (8 * chunksz)) | bfd_get_64 (input_bfd, location);
7851 decode_complex_addend (unsigned long *start, /* in bits */
7852 unsigned long *oplen, /* in bits */
7853 unsigned long *len, /* in bits */
7854 unsigned long *wordsz, /* in bytes */
7855 unsigned long *chunksz, /* in bytes */
7856 unsigned long *lsb0_p,
7857 unsigned long *signed_p,
7858 unsigned long *trunc_p,
7859 unsigned long encoded)
7861 * start = encoded & 0x3F;
7862 * len = (encoded >> 6) & 0x3F;
7863 * oplen = (encoded >> 12) & 0x3F;
7864 * wordsz = (encoded >> 18) & 0xF;
7865 * chunksz = (encoded >> 22) & 0xF;
7866 * lsb0_p = (encoded >> 27) & 1;
7867 * signed_p = (encoded >> 28) & 1;
7868 * trunc_p = (encoded >> 29) & 1;
7871 bfd_reloc_status_type
7872 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7873 asection *input_section ATTRIBUTE_UNUSED,
7875 Elf_Internal_Rela *rel,
7878 bfd_vma shift, x, mask;
7879 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7880 bfd_reloc_status_type r;
7882 /* Perform this reloc, since it is complex.
7883 (this is not to say that it necessarily refers to a complex
7884 symbol; merely that it is a self-describing CGEN based reloc.
7885 i.e. the addend has the complete reloc information (bit start, end,
7886 word size, etc) encoded within it.). */
7888 decode_complex_addend (&start, &oplen, &len, &wordsz,
7889 &chunksz, &lsb0_p, &signed_p,
7890 &trunc_p, rel->r_addend);
7892 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7895 shift = (start + 1) - len;
7897 shift = (8 * wordsz) - (start + len);
7899 /* FIXME: octets_per_byte. */
7900 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7903 printf ("Doing complex reloc: "
7904 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7905 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7906 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7907 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7908 oplen, (unsigned long) x, (unsigned long) mask,
7909 (unsigned long) relocation);
7914 /* Now do an overflow check. */
7915 r = bfd_check_overflow ((signed_p
7916 ? complain_overflow_signed
7917 : complain_overflow_unsigned),
7918 len, 0, (8 * wordsz),
7922 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7925 printf (" relocation: %8.8lx\n"
7926 " shifted mask: %8.8lx\n"
7927 " shifted/masked reloc: %8.8lx\n"
7928 " result: %8.8lx\n",
7929 (unsigned long) relocation, (unsigned long) (mask << shift),
7930 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
7932 /* FIXME: octets_per_byte. */
7933 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7937 /* When performing a relocatable link, the input relocations are
7938 preserved. But, if they reference global symbols, the indices
7939 referenced must be updated. Update all the relocations found in
7943 elf_link_adjust_relocs (bfd *abfd,
7944 struct bfd_elf_section_reloc_data *reldata)
7947 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7949 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7950 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7951 bfd_vma r_type_mask;
7953 unsigned int count = reldata->count;
7954 struct elf_link_hash_entry **rel_hash = reldata->hashes;
7956 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
7958 swap_in = bed->s->swap_reloc_in;
7959 swap_out = bed->s->swap_reloc_out;
7961 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
7963 swap_in = bed->s->swap_reloca_in;
7964 swap_out = bed->s->swap_reloca_out;
7969 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
7972 if (bed->s->arch_size == 32)
7979 r_type_mask = 0xffffffff;
7983 erela = reldata->hdr->contents;
7984 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
7986 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
7989 if (*rel_hash == NULL)
7992 BFD_ASSERT ((*rel_hash)->indx >= 0);
7994 (*swap_in) (abfd, erela, irela);
7995 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
7996 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
7997 | (irela[j].r_info & r_type_mask));
7998 (*swap_out) (abfd, irela, erela);
8002 struct elf_link_sort_rela
8008 enum elf_reloc_type_class type;
8009 /* We use this as an array of size int_rels_per_ext_rel. */
8010 Elf_Internal_Rela rela[1];
8014 elf_link_sort_cmp1 (const void *A, const void *B)
8016 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8017 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8018 int relativea, relativeb;
8020 relativea = a->type == reloc_class_relative;
8021 relativeb = b->type == reloc_class_relative;
8023 if (relativea < relativeb)
8025 if (relativea > relativeb)
8027 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8029 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8031 if (a->rela->r_offset < b->rela->r_offset)
8033 if (a->rela->r_offset > b->rela->r_offset)
8039 elf_link_sort_cmp2 (const void *A, const void *B)
8041 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8042 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8045 if (a->u.offset < b->u.offset)
8047 if (a->u.offset > b->u.offset)
8049 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
8050 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
8055 if (a->rela->r_offset < b->rela->r_offset)
8057 if (a->rela->r_offset > b->rela->r_offset)
8063 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8065 asection *dynamic_relocs;
8068 bfd_size_type count, size;
8069 size_t i, ret, sort_elt, ext_size;
8070 bfd_byte *sort, *s_non_relative, *p;
8071 struct elf_link_sort_rela *sq;
8072 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8073 int i2e = bed->s->int_rels_per_ext_rel;
8074 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8075 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8076 struct bfd_link_order *lo;
8078 bfd_boolean use_rela;
8080 /* Find a dynamic reloc section. */
8081 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8082 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8083 if (rela_dyn != NULL && rela_dyn->size > 0
8084 && rel_dyn != NULL && rel_dyn->size > 0)
8086 bfd_boolean use_rela_initialised = FALSE;
8088 /* This is just here to stop gcc from complaining.
8089 It's initialization checking code is not perfect. */
8092 /* Both sections are present. Examine the sizes
8093 of the indirect sections to help us choose. */
8094 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8095 if (lo->type == bfd_indirect_link_order)
8097 asection *o = lo->u.indirect.section;
8099 if ((o->size % bed->s->sizeof_rela) == 0)
8101 if ((o->size % bed->s->sizeof_rel) == 0)
8102 /* Section size is divisible by both rel and rela sizes.
8103 It is of no help to us. */
8107 /* Section size is only divisible by rela. */
8108 if (use_rela_initialised && (use_rela == FALSE))
8111 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8112 bfd_set_error (bfd_error_invalid_operation);
8118 use_rela_initialised = TRUE;
8122 else if ((o->size % bed->s->sizeof_rel) == 0)
8124 /* Section size is only divisible by rel. */
8125 if (use_rela_initialised && (use_rela == TRUE))
8128 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8129 bfd_set_error (bfd_error_invalid_operation);
8135 use_rela_initialised = TRUE;
8140 /* The section size is not divisible by either - something is wrong. */
8142 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8143 bfd_set_error (bfd_error_invalid_operation);
8148 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8149 if (lo->type == bfd_indirect_link_order)
8151 asection *o = lo->u.indirect.section;
8153 if ((o->size % bed->s->sizeof_rela) == 0)
8155 if ((o->size % bed->s->sizeof_rel) == 0)
8156 /* Section size is divisible by both rel and rela sizes.
8157 It is of no help to us. */
8161 /* Section size is only divisible by rela. */
8162 if (use_rela_initialised && (use_rela == FALSE))
8165 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8166 bfd_set_error (bfd_error_invalid_operation);
8172 use_rela_initialised = TRUE;
8176 else if ((o->size % bed->s->sizeof_rel) == 0)
8178 /* Section size is only divisible by rel. */
8179 if (use_rela_initialised && (use_rela == TRUE))
8182 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8183 bfd_set_error (bfd_error_invalid_operation);
8189 use_rela_initialised = TRUE;
8194 /* The section size is not divisible by either - something is wrong. */
8196 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8197 bfd_set_error (bfd_error_invalid_operation);
8202 if (! use_rela_initialised)
8206 else if (rela_dyn != NULL && rela_dyn->size > 0)
8208 else if (rel_dyn != NULL && rel_dyn->size > 0)
8215 dynamic_relocs = rela_dyn;
8216 ext_size = bed->s->sizeof_rela;
8217 swap_in = bed->s->swap_reloca_in;
8218 swap_out = bed->s->swap_reloca_out;
8222 dynamic_relocs = rel_dyn;
8223 ext_size = bed->s->sizeof_rel;
8224 swap_in = bed->s->swap_reloc_in;
8225 swap_out = bed->s->swap_reloc_out;
8229 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8230 if (lo->type == bfd_indirect_link_order)
8231 size += lo->u.indirect.section->size;
8233 if (size != dynamic_relocs->size)
8236 sort_elt = (sizeof (struct elf_link_sort_rela)
8237 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8239 count = dynamic_relocs->size / ext_size;
8242 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8246 (*info->callbacks->warning)
8247 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8251 if (bed->s->arch_size == 32)
8252 r_sym_mask = ~(bfd_vma) 0xff;
8254 r_sym_mask = ~(bfd_vma) 0xffffffff;
8256 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8257 if (lo->type == bfd_indirect_link_order)
8259 bfd_byte *erel, *erelend;
8260 asection *o = lo->u.indirect.section;
8262 if (o->contents == NULL && o->size != 0)
8264 /* This is a reloc section that is being handled as a normal
8265 section. See bfd_section_from_shdr. We can't combine
8266 relocs in this case. */
8271 erelend = o->contents + o->size;
8272 /* FIXME: octets_per_byte. */
8273 p = sort + o->output_offset / ext_size * sort_elt;
8275 while (erel < erelend)
8277 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8279 (*swap_in) (abfd, erel, s->rela);
8280 s->type = (*bed->elf_backend_reloc_type_class) (s->rela);
8281 s->u.sym_mask = r_sym_mask;
8287 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8289 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8291 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8292 if (s->type != reloc_class_relative)
8298 sq = (struct elf_link_sort_rela *) s_non_relative;
8299 for (; i < count; i++, p += sort_elt)
8301 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8302 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8304 sp->u.offset = sq->rela->r_offset;
8307 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8309 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8310 if (lo->type == bfd_indirect_link_order)
8312 bfd_byte *erel, *erelend;
8313 asection *o = lo->u.indirect.section;
8316 erelend = o->contents + o->size;
8317 /* FIXME: octets_per_byte. */
8318 p = sort + o->output_offset / ext_size * sort_elt;
8319 while (erel < erelend)
8321 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8322 (*swap_out) (abfd, s->rela, erel);
8329 *psec = dynamic_relocs;
8333 /* Flush the output symbols to the file. */
8336 elf_link_flush_output_syms (struct elf_final_link_info *finfo,
8337 const struct elf_backend_data *bed)
8339 if (finfo->symbuf_count > 0)
8341 Elf_Internal_Shdr *hdr;
8345 hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
8346 pos = hdr->sh_offset + hdr->sh_size;
8347 amt = finfo->symbuf_count * bed->s->sizeof_sym;
8348 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
8349 || bfd_bwrite (finfo->symbuf, amt, finfo->output_bfd) != amt)
8352 hdr->sh_size += amt;
8353 finfo->symbuf_count = 0;
8359 /* Add a symbol to the output symbol table. */
8362 elf_link_output_sym (struct elf_final_link_info *finfo,
8364 Elf_Internal_Sym *elfsym,
8365 asection *input_sec,
8366 struct elf_link_hash_entry *h)
8369 Elf_External_Sym_Shndx *destshndx;
8370 int (*output_symbol_hook)
8371 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8372 struct elf_link_hash_entry *);
8373 const struct elf_backend_data *bed;
8375 bed = get_elf_backend_data (finfo->output_bfd);
8376 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8377 if (output_symbol_hook != NULL)
8379 int ret = (*output_symbol_hook) (finfo->info, name, elfsym, input_sec, h);
8384 if (name == NULL || *name == '\0')
8385 elfsym->st_name = 0;
8386 else if (input_sec->flags & SEC_EXCLUDE)
8387 elfsym->st_name = 0;
8390 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
8392 if (elfsym->st_name == (unsigned long) -1)
8396 if (finfo->symbuf_count >= finfo->symbuf_size)
8398 if (! elf_link_flush_output_syms (finfo, bed))
8402 dest = finfo->symbuf + finfo->symbuf_count * bed->s->sizeof_sym;
8403 destshndx = finfo->symshndxbuf;
8404 if (destshndx != NULL)
8406 if (bfd_get_symcount (finfo->output_bfd) >= finfo->shndxbuf_size)
8410 amt = finfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8411 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8413 if (destshndx == NULL)
8415 finfo->symshndxbuf = destshndx;
8416 memset ((char *) destshndx + amt, 0, amt);
8417 finfo->shndxbuf_size *= 2;
8419 destshndx += bfd_get_symcount (finfo->output_bfd);
8422 bed->s->swap_symbol_out (finfo->output_bfd, elfsym, dest, destshndx);
8423 finfo->symbuf_count += 1;
8424 bfd_get_symcount (finfo->output_bfd) += 1;
8429 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8432 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8434 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8435 && sym->st_shndx < SHN_LORESERVE)
8437 /* The gABI doesn't support dynamic symbols in output sections
8439 (*_bfd_error_handler)
8440 (_("%B: Too many sections: %d (>= %d)"),
8441 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8442 bfd_set_error (bfd_error_nonrepresentable_section);
8448 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8449 allowing an unsatisfied unversioned symbol in the DSO to match a
8450 versioned symbol that would normally require an explicit version.
8451 We also handle the case that a DSO references a hidden symbol
8452 which may be satisfied by a versioned symbol in another DSO. */
8455 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8456 const struct elf_backend_data *bed,
8457 struct elf_link_hash_entry *h)
8460 struct elf_link_loaded_list *loaded;
8462 if (!is_elf_hash_table (info->hash))
8465 switch (h->root.type)
8471 case bfd_link_hash_undefined:
8472 case bfd_link_hash_undefweak:
8473 abfd = h->root.u.undef.abfd;
8474 if ((abfd->flags & DYNAMIC) == 0
8475 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8479 case bfd_link_hash_defined:
8480 case bfd_link_hash_defweak:
8481 abfd = h->root.u.def.section->owner;
8484 case bfd_link_hash_common:
8485 abfd = h->root.u.c.p->section->owner;
8488 BFD_ASSERT (abfd != NULL);
8490 for (loaded = elf_hash_table (info)->loaded;
8492 loaded = loaded->next)
8495 Elf_Internal_Shdr *hdr;
8496 bfd_size_type symcount;
8497 bfd_size_type extsymcount;
8498 bfd_size_type extsymoff;
8499 Elf_Internal_Shdr *versymhdr;
8500 Elf_Internal_Sym *isym;
8501 Elf_Internal_Sym *isymend;
8502 Elf_Internal_Sym *isymbuf;
8503 Elf_External_Versym *ever;
8504 Elf_External_Versym *extversym;
8506 input = loaded->abfd;
8508 /* We check each DSO for a possible hidden versioned definition. */
8510 || (input->flags & DYNAMIC) == 0
8511 || elf_dynversym (input) == 0)
8514 hdr = &elf_tdata (input)->dynsymtab_hdr;
8516 symcount = hdr->sh_size / bed->s->sizeof_sym;
8517 if (elf_bad_symtab (input))
8519 extsymcount = symcount;
8524 extsymcount = symcount - hdr->sh_info;
8525 extsymoff = hdr->sh_info;
8528 if (extsymcount == 0)
8531 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8533 if (isymbuf == NULL)
8536 /* Read in any version definitions. */
8537 versymhdr = &elf_tdata (input)->dynversym_hdr;
8538 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8539 if (extversym == NULL)
8542 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8543 || (bfd_bread (extversym, versymhdr->sh_size, input)
8544 != versymhdr->sh_size))
8552 ever = extversym + extsymoff;
8553 isymend = isymbuf + extsymcount;
8554 for (isym = isymbuf; isym < isymend; isym++, ever++)
8557 Elf_Internal_Versym iver;
8558 unsigned short version_index;
8560 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8561 || isym->st_shndx == SHN_UNDEF)
8564 name = bfd_elf_string_from_elf_section (input,
8567 if (strcmp (name, h->root.root.string) != 0)
8570 _bfd_elf_swap_versym_in (input, ever, &iver);
8572 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8574 && h->forced_local))
8576 /* If we have a non-hidden versioned sym, then it should
8577 have provided a definition for the undefined sym unless
8578 it is defined in a non-shared object and forced local.
8583 version_index = iver.vs_vers & VERSYM_VERSION;
8584 if (version_index == 1 || version_index == 2)
8586 /* This is the base or first version. We can use it. */
8600 /* Add an external symbol to the symbol table. This is called from
8601 the hash table traversal routine. When generating a shared object,
8602 we go through the symbol table twice. The first time we output
8603 anything that might have been forced to local scope in a version
8604 script. The second time we output the symbols that are still
8608 elf_link_output_extsym (struct elf_link_hash_entry *h, void *data)
8610 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8611 struct elf_final_link_info *finfo = eoinfo->finfo;
8613 Elf_Internal_Sym sym;
8614 asection *input_sec;
8615 const struct elf_backend_data *bed;
8619 if (h->root.type == bfd_link_hash_warning)
8621 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8622 if (h->root.type == bfd_link_hash_new)
8626 /* Decide whether to output this symbol in this pass. */
8627 if (eoinfo->localsyms)
8629 if (!h->forced_local)
8634 if (h->forced_local)
8638 bed = get_elf_backend_data (finfo->output_bfd);
8640 if (h->root.type == bfd_link_hash_undefined)
8642 /* If we have an undefined symbol reference here then it must have
8643 come from a shared library that is being linked in. (Undefined
8644 references in regular files have already been handled unless
8645 they are in unreferenced sections which are removed by garbage
8647 bfd_boolean ignore_undef = FALSE;
8649 /* Some symbols may be special in that the fact that they're
8650 undefined can be safely ignored - let backend determine that. */
8651 if (bed->elf_backend_ignore_undef_symbol)
8652 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8654 /* If we are reporting errors for this situation then do so now. */
8657 && (!h->ref_regular || finfo->info->gc_sections)
8658 && ! elf_link_check_versioned_symbol (finfo->info, bed, h)
8659 && finfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8661 if (! (finfo->info->callbacks->undefined_symbol
8662 (finfo->info, h->root.root.string,
8663 h->ref_regular ? NULL : h->root.u.undef.abfd,
8664 NULL, 0, finfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR)))
8666 bfd_set_error (bfd_error_bad_value);
8667 eoinfo->failed = TRUE;
8673 /* We should also warn if a forced local symbol is referenced from
8674 shared libraries. */
8675 if (! finfo->info->relocatable
8676 && (! finfo->info->shared)
8681 && ! elf_link_check_versioned_symbol (finfo->info, bed, h))
8686 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
8687 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
8688 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
8689 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
8691 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
8692 def_bfd = finfo->output_bfd;
8693 if (h->root.u.def.section != bfd_abs_section_ptr)
8694 def_bfd = h->root.u.def.section->owner;
8695 (*_bfd_error_handler) (msg, finfo->output_bfd, def_bfd,
8696 h->root.root.string);
8697 bfd_set_error (bfd_error_bad_value);
8698 eoinfo->failed = TRUE;
8702 /* We don't want to output symbols that have never been mentioned by
8703 a regular file, or that we have been told to strip. However, if
8704 h->indx is set to -2, the symbol is used by a reloc and we must
8708 else if ((h->def_dynamic
8710 || h->root.type == bfd_link_hash_new)
8714 else if (finfo->info->strip == strip_all)
8716 else if (finfo->info->strip == strip_some
8717 && bfd_hash_lookup (finfo->info->keep_hash,
8718 h->root.root.string, FALSE, FALSE) == NULL)
8720 else if (finfo->info->strip_discarded
8721 && (h->root.type == bfd_link_hash_defined
8722 || h->root.type == bfd_link_hash_defweak)
8723 && elf_discarded_section (h->root.u.def.section))
8725 else if ((h->root.type == bfd_link_hash_undefined
8726 || h->root.type == bfd_link_hash_undefweak)
8727 && h->root.u.undef.abfd != NULL
8728 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
8733 /* If we're stripping it, and it's not a dynamic symbol, there's
8734 nothing else to do unless it is a forced local symbol or a
8735 STT_GNU_IFUNC symbol. */
8738 && h->type != STT_GNU_IFUNC
8739 && !h->forced_local)
8743 sym.st_size = h->size;
8744 sym.st_other = h->other;
8745 if (h->forced_local)
8747 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8748 /* Turn off visibility on local symbol. */
8749 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8751 else if (h->unique_global)
8752 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8753 else if (h->root.type == bfd_link_hash_undefweak
8754 || h->root.type == bfd_link_hash_defweak)
8755 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8757 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8759 switch (h->root.type)
8762 case bfd_link_hash_new:
8763 case bfd_link_hash_warning:
8767 case bfd_link_hash_undefined:
8768 case bfd_link_hash_undefweak:
8769 input_sec = bfd_und_section_ptr;
8770 sym.st_shndx = SHN_UNDEF;
8773 case bfd_link_hash_defined:
8774 case bfd_link_hash_defweak:
8776 input_sec = h->root.u.def.section;
8777 if (input_sec->output_section != NULL)
8780 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
8781 input_sec->output_section);
8782 if (sym.st_shndx == SHN_BAD)
8784 (*_bfd_error_handler)
8785 (_("%B: could not find output section %A for input section %A"),
8786 finfo->output_bfd, input_sec->output_section, input_sec);
8787 bfd_set_error (bfd_error_nonrepresentable_section);
8788 eoinfo->failed = TRUE;
8792 /* ELF symbols in relocatable files are section relative,
8793 but in nonrelocatable files they are virtual
8795 sym.st_value = h->root.u.def.value + input_sec->output_offset;
8796 if (! finfo->info->relocatable)
8798 sym.st_value += input_sec->output_section->vma;
8799 if (h->type == STT_TLS)
8801 asection *tls_sec = elf_hash_table (finfo->info)->tls_sec;
8802 if (tls_sec != NULL)
8803 sym.st_value -= tls_sec->vma;
8806 /* The TLS section may have been garbage collected. */
8807 BFD_ASSERT (finfo->info->gc_sections
8808 && !input_sec->gc_mark);
8815 BFD_ASSERT (input_sec->owner == NULL
8816 || (input_sec->owner->flags & DYNAMIC) != 0);
8817 sym.st_shndx = SHN_UNDEF;
8818 input_sec = bfd_und_section_ptr;
8823 case bfd_link_hash_common:
8824 input_sec = h->root.u.c.p->section;
8825 sym.st_shndx = bed->common_section_index (input_sec);
8826 sym.st_value = 1 << h->root.u.c.p->alignment_power;
8829 case bfd_link_hash_indirect:
8830 /* These symbols are created by symbol versioning. They point
8831 to the decorated version of the name. For example, if the
8832 symbol foo@@GNU_1.2 is the default, which should be used when
8833 foo is used with no version, then we add an indirect symbol
8834 foo which points to foo@@GNU_1.2. We ignore these symbols,
8835 since the indirected symbol is already in the hash table. */
8839 /* Give the processor backend a chance to tweak the symbol value,
8840 and also to finish up anything that needs to be done for this
8841 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8842 forced local syms when non-shared is due to a historical quirk.
8843 STT_GNU_IFUNC symbol must go through PLT. */
8844 if ((h->type == STT_GNU_IFUNC
8846 && !finfo->info->relocatable)
8847 || ((h->dynindx != -1
8849 && ((finfo->info->shared
8850 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
8851 || h->root.type != bfd_link_hash_undefweak))
8852 || !h->forced_local)
8853 && elf_hash_table (finfo->info)->dynamic_sections_created))
8855 if (! ((*bed->elf_backend_finish_dynamic_symbol)
8856 (finfo->output_bfd, finfo->info, h, &sym)))
8858 eoinfo->failed = TRUE;
8863 /* If we are marking the symbol as undefined, and there are no
8864 non-weak references to this symbol from a regular object, then
8865 mark the symbol as weak undefined; if there are non-weak
8866 references, mark the symbol as strong. We can't do this earlier,
8867 because it might not be marked as undefined until the
8868 finish_dynamic_symbol routine gets through with it. */
8869 if (sym.st_shndx == SHN_UNDEF
8871 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
8872 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
8875 unsigned int type = ELF_ST_TYPE (sym.st_info);
8877 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8878 if (type == STT_GNU_IFUNC)
8881 if (h->ref_regular_nonweak)
8882 bindtype = STB_GLOBAL;
8884 bindtype = STB_WEAK;
8885 sym.st_info = ELF_ST_INFO (bindtype, type);
8888 /* If this is a symbol defined in a dynamic library, don't use the
8889 symbol size from the dynamic library. Relinking an executable
8890 against a new library may introduce gratuitous changes in the
8891 executable's symbols if we keep the size. */
8892 if (sym.st_shndx == SHN_UNDEF
8897 /* If a non-weak symbol with non-default visibility is not defined
8898 locally, it is a fatal error. */
8899 if (! finfo->info->relocatable
8900 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
8901 && ELF_ST_BIND (sym.st_info) != STB_WEAK
8902 && h->root.type == bfd_link_hash_undefined
8907 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
8908 msg = _("%B: protected symbol `%s' isn't defined");
8909 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
8910 msg = _("%B: internal symbol `%s' isn't defined");
8912 msg = _("%B: hidden symbol `%s' isn't defined");
8913 (*_bfd_error_handler) (msg, finfo->output_bfd, h->root.root.string);
8914 bfd_set_error (bfd_error_bad_value);
8915 eoinfo->failed = TRUE;
8919 /* If this symbol should be put in the .dynsym section, then put it
8920 there now. We already know the symbol index. We also fill in
8921 the entry in the .hash section. */
8922 if (h->dynindx != -1
8923 && elf_hash_table (finfo->info)->dynamic_sections_created)
8927 sym.st_name = h->dynstr_index;
8928 esym = finfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
8929 if (! check_dynsym (finfo->output_bfd, &sym))
8931 eoinfo->failed = TRUE;
8934 bed->s->swap_symbol_out (finfo->output_bfd, &sym, esym, 0);
8936 if (finfo->hash_sec != NULL)
8938 size_t hash_entry_size;
8939 bfd_byte *bucketpos;
8944 bucketcount = elf_hash_table (finfo->info)->bucketcount;
8945 bucket = h->u.elf_hash_value % bucketcount;
8948 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
8949 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
8950 + (bucket + 2) * hash_entry_size);
8951 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
8952 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
8953 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
8954 ((bfd_byte *) finfo->hash_sec->contents
8955 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
8958 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
8960 Elf_Internal_Versym iversym;
8961 Elf_External_Versym *eversym;
8963 if (!h->def_regular)
8965 if (h->verinfo.verdef == NULL)
8966 iversym.vs_vers = 0;
8968 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
8972 if (h->verinfo.vertree == NULL)
8973 iversym.vs_vers = 1;
8975 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
8976 if (finfo->info->create_default_symver)
8981 iversym.vs_vers |= VERSYM_HIDDEN;
8983 eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
8984 eversym += h->dynindx;
8985 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
8989 /* If we're stripping it, then it was just a dynamic symbol, and
8990 there's nothing else to do. */
8991 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
8994 indx = bfd_get_symcount (finfo->output_bfd);
8995 ret = elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec, h);
8998 eoinfo->failed = TRUE;
9003 else if (h->indx == -2)
9009 /* Return TRUE if special handling is done for relocs in SEC against
9010 symbols defined in discarded sections. */
9013 elf_section_ignore_discarded_relocs (asection *sec)
9015 const struct elf_backend_data *bed;
9017 switch (sec->sec_info_type)
9019 case ELF_INFO_TYPE_STABS:
9020 case ELF_INFO_TYPE_EH_FRAME:
9026 bed = get_elf_backend_data (sec->owner);
9027 if (bed->elf_backend_ignore_discarded_relocs != NULL
9028 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9034 /* Return a mask saying how ld should treat relocations in SEC against
9035 symbols defined in discarded sections. If this function returns
9036 COMPLAIN set, ld will issue a warning message. If this function
9037 returns PRETEND set, and the discarded section was link-once and the
9038 same size as the kept link-once section, ld will pretend that the
9039 symbol was actually defined in the kept section. Otherwise ld will
9040 zero the reloc (at least that is the intent, but some cooperation by
9041 the target dependent code is needed, particularly for REL targets). */
9044 _bfd_elf_default_action_discarded (asection *sec)
9046 if (sec->flags & SEC_DEBUGGING)
9049 if (strcmp (".eh_frame", sec->name) == 0)
9052 if (strcmp (".gcc_except_table", sec->name) == 0)
9055 return COMPLAIN | PRETEND;
9058 /* Find a match between a section and a member of a section group. */
9061 match_group_member (asection *sec, asection *group,
9062 struct bfd_link_info *info)
9064 asection *first = elf_next_in_group (group);
9065 asection *s = first;
9069 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9072 s = elf_next_in_group (s);
9080 /* Check if the kept section of a discarded section SEC can be used
9081 to replace it. Return the replacement if it is OK. Otherwise return
9085 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9089 kept = sec->kept_section;
9092 if ((kept->flags & SEC_GROUP) != 0)
9093 kept = match_group_member (sec, kept, info);
9095 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9096 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9098 sec->kept_section = kept;
9103 /* Link an input file into the linker output file. This function
9104 handles all the sections and relocations of the input file at once.
9105 This is so that we only have to read the local symbols once, and
9106 don't have to keep them in memory. */
9109 elf_link_input_bfd (struct elf_final_link_info *finfo, bfd *input_bfd)
9111 int (*relocate_section)
9112 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9113 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9115 Elf_Internal_Shdr *symtab_hdr;
9118 Elf_Internal_Sym *isymbuf;
9119 Elf_Internal_Sym *isym;
9120 Elf_Internal_Sym *isymend;
9122 asection **ppsection;
9124 const struct elf_backend_data *bed;
9125 struct elf_link_hash_entry **sym_hashes;
9127 output_bfd = finfo->output_bfd;
9128 bed = get_elf_backend_data (output_bfd);
9129 relocate_section = bed->elf_backend_relocate_section;
9131 /* If this is a dynamic object, we don't want to do anything here:
9132 we don't want the local symbols, and we don't want the section
9134 if ((input_bfd->flags & DYNAMIC) != 0)
9137 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9138 if (elf_bad_symtab (input_bfd))
9140 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9145 locsymcount = symtab_hdr->sh_info;
9146 extsymoff = symtab_hdr->sh_info;
9149 /* Read the local symbols. */
9150 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9151 if (isymbuf == NULL && locsymcount != 0)
9153 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9154 finfo->internal_syms,
9155 finfo->external_syms,
9156 finfo->locsym_shndx);
9157 if (isymbuf == NULL)
9161 /* Find local symbol sections and adjust values of symbols in
9162 SEC_MERGE sections. Write out those local symbols we know are
9163 going into the output file. */
9164 isymend = isymbuf + locsymcount;
9165 for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections;
9167 isym++, pindex++, ppsection++)
9171 Elf_Internal_Sym osym;
9177 if (elf_bad_symtab (input_bfd))
9179 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9186 if (isym->st_shndx == SHN_UNDEF)
9187 isec = bfd_und_section_ptr;
9188 else if (isym->st_shndx == SHN_ABS)
9189 isec = bfd_abs_section_ptr;
9190 else if (isym->st_shndx == SHN_COMMON)
9191 isec = bfd_com_section_ptr;
9194 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9197 /* Don't attempt to output symbols with st_shnx in the
9198 reserved range other than SHN_ABS and SHN_COMMON. */
9202 else if (isec->sec_info_type == ELF_INFO_TYPE_MERGE
9203 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9205 _bfd_merged_section_offset (output_bfd, &isec,
9206 elf_section_data (isec)->sec_info,
9212 /* Don't output the first, undefined, symbol. */
9213 if (ppsection == finfo->sections)
9216 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9218 /* We never output section symbols. Instead, we use the
9219 section symbol of the corresponding section in the output
9224 /* If we are stripping all symbols, we don't want to output this
9226 if (finfo->info->strip == strip_all)
9229 /* If we are discarding all local symbols, we don't want to
9230 output this one. If we are generating a relocatable output
9231 file, then some of the local symbols may be required by
9232 relocs; we output them below as we discover that they are
9234 if (finfo->info->discard == discard_all)
9237 /* If this symbol is defined in a section which we are
9238 discarding, we don't need to keep it. */
9239 if (isym->st_shndx != SHN_UNDEF
9240 && isym->st_shndx < SHN_LORESERVE
9241 && bfd_section_removed_from_list (output_bfd,
9242 isec->output_section))
9245 /* Get the name of the symbol. */
9246 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9251 /* See if we are discarding symbols with this name. */
9252 if ((finfo->info->strip == strip_some
9253 && (bfd_hash_lookup (finfo->info->keep_hash, name, FALSE, FALSE)
9255 || (((finfo->info->discard == discard_sec_merge
9256 && (isec->flags & SEC_MERGE) && ! finfo->info->relocatable)
9257 || finfo->info->discard == discard_l)
9258 && bfd_is_local_label_name (input_bfd, name)))
9263 /* Adjust the section index for the output file. */
9264 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9265 isec->output_section);
9266 if (osym.st_shndx == SHN_BAD)
9269 /* ELF symbols in relocatable files are section relative, but
9270 in executable files they are virtual addresses. Note that
9271 this code assumes that all ELF sections have an associated
9272 BFD section with a reasonable value for output_offset; below
9273 we assume that they also have a reasonable value for
9274 output_section. Any special sections must be set up to meet
9275 these requirements. */
9276 osym.st_value += isec->output_offset;
9277 if (! finfo->info->relocatable)
9279 osym.st_value += isec->output_section->vma;
9280 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9282 /* STT_TLS symbols are relative to PT_TLS segment base. */
9283 BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL);
9284 osym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma;
9288 indx = bfd_get_symcount (output_bfd);
9289 ret = elf_link_output_sym (finfo, name, &osym, isec, NULL);
9296 /* Relocate the contents of each section. */
9297 sym_hashes = elf_sym_hashes (input_bfd);
9298 for (o = input_bfd->sections; o != NULL; o = o->next)
9302 if (! o->linker_mark)
9304 /* This section was omitted from the link. */
9308 if (finfo->info->relocatable
9309 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9311 /* Deal with the group signature symbol. */
9312 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9313 unsigned long symndx = sec_data->this_hdr.sh_info;
9314 asection *osec = o->output_section;
9316 if (symndx >= locsymcount
9317 || (elf_bad_symtab (input_bfd)
9318 && finfo->sections[symndx] == NULL))
9320 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9321 while (h->root.type == bfd_link_hash_indirect
9322 || h->root.type == bfd_link_hash_warning)
9323 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9324 /* Arrange for symbol to be output. */
9326 elf_section_data (osec)->this_hdr.sh_info = -2;
9328 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9330 /* We'll use the output section target_index. */
9331 asection *sec = finfo->sections[symndx]->output_section;
9332 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9336 if (finfo->indices[symndx] == -1)
9338 /* Otherwise output the local symbol now. */
9339 Elf_Internal_Sym sym = isymbuf[symndx];
9340 asection *sec = finfo->sections[symndx]->output_section;
9345 name = bfd_elf_string_from_elf_section (input_bfd,
9346 symtab_hdr->sh_link,
9351 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9353 if (sym.st_shndx == SHN_BAD)
9356 sym.st_value += o->output_offset;
9358 indx = bfd_get_symcount (output_bfd);
9359 ret = elf_link_output_sym (finfo, name, &sym, o, NULL);
9363 finfo->indices[symndx] = indx;
9367 elf_section_data (osec)->this_hdr.sh_info
9368 = finfo->indices[symndx];
9372 if ((o->flags & SEC_HAS_CONTENTS) == 0
9373 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9376 if ((o->flags & SEC_LINKER_CREATED) != 0)
9378 /* Section was created by _bfd_elf_link_create_dynamic_sections
9383 /* Get the contents of the section. They have been cached by a
9384 relaxation routine. Note that o is a section in an input
9385 file, so the contents field will not have been set by any of
9386 the routines which work on output files. */
9387 if (elf_section_data (o)->this_hdr.contents != NULL)
9388 contents = elf_section_data (o)->this_hdr.contents;
9391 contents = finfo->contents;
9392 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9396 if ((o->flags & SEC_RELOC) != 0)
9398 Elf_Internal_Rela *internal_relocs;
9399 Elf_Internal_Rela *rel, *relend;
9400 bfd_vma r_type_mask;
9402 int action_discarded;
9405 /* Get the swapped relocs. */
9407 = _bfd_elf_link_read_relocs (input_bfd, o, finfo->external_relocs,
9408 finfo->internal_relocs, FALSE);
9409 if (internal_relocs == NULL
9410 && o->reloc_count > 0)
9413 if (bed->s->arch_size == 32)
9420 r_type_mask = 0xffffffff;
9424 action_discarded = -1;
9425 if (!elf_section_ignore_discarded_relocs (o))
9426 action_discarded = (*bed->action_discarded) (o);
9428 /* Run through the relocs evaluating complex reloc symbols and
9429 looking for relocs against symbols from discarded sections
9430 or section symbols from removed link-once sections.
9431 Complain about relocs against discarded sections. Zero
9432 relocs against removed link-once sections. */
9434 rel = internal_relocs;
9435 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9436 for ( ; rel < relend; rel++)
9438 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9439 unsigned int s_type;
9440 asection **ps, *sec;
9441 struct elf_link_hash_entry *h = NULL;
9442 const char *sym_name;
9444 if (r_symndx == STN_UNDEF)
9447 if (r_symndx >= locsymcount
9448 || (elf_bad_symtab (input_bfd)
9449 && finfo->sections[r_symndx] == NULL))
9451 h = sym_hashes[r_symndx - extsymoff];
9453 /* Badly formatted input files can contain relocs that
9454 reference non-existant symbols. Check here so that
9455 we do not seg fault. */
9460 sprintf_vma (buffer, rel->r_info);
9461 (*_bfd_error_handler)
9462 (_("error: %B contains a reloc (0x%s) for section %A "
9463 "that references a non-existent global symbol"),
9464 input_bfd, o, buffer);
9465 bfd_set_error (bfd_error_bad_value);
9469 while (h->root.type == bfd_link_hash_indirect
9470 || h->root.type == bfd_link_hash_warning)
9471 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9476 if (h->root.type == bfd_link_hash_defined
9477 || h->root.type == bfd_link_hash_defweak)
9478 ps = &h->root.u.def.section;
9480 sym_name = h->root.root.string;
9484 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9486 s_type = ELF_ST_TYPE (sym->st_info);
9487 ps = &finfo->sections[r_symndx];
9488 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9492 if ((s_type == STT_RELC || s_type == STT_SRELC)
9493 && !finfo->info->relocatable)
9496 bfd_vma dot = (rel->r_offset
9497 + o->output_offset + o->output_section->vma);
9499 printf ("Encountered a complex symbol!");
9500 printf (" (input_bfd %s, section %s, reloc %ld\n",
9501 input_bfd->filename, o->name,
9502 (long) (rel - internal_relocs));
9503 printf (" symbol: idx %8.8lx, name %s\n",
9504 r_symndx, sym_name);
9505 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9506 (unsigned long) rel->r_info,
9507 (unsigned long) rel->r_offset);
9509 if (!eval_symbol (&val, &sym_name, input_bfd, finfo, dot,
9510 isymbuf, locsymcount, s_type == STT_SRELC))
9513 /* Symbol evaluated OK. Update to absolute value. */
9514 set_symbol_value (input_bfd, isymbuf, locsymcount,
9519 if (action_discarded != -1 && ps != NULL)
9521 /* Complain if the definition comes from a
9522 discarded section. */
9523 if ((sec = *ps) != NULL && elf_discarded_section (sec))
9525 BFD_ASSERT (r_symndx != STN_UNDEF);
9526 if (action_discarded & COMPLAIN)
9527 (*finfo->info->callbacks->einfo)
9528 (_("%X`%s' referenced in section `%A' of %B: "
9529 "defined in discarded section `%A' of %B\n"),
9530 sym_name, o, input_bfd, sec, sec->owner);
9532 /* Try to do the best we can to support buggy old
9533 versions of gcc. Pretend that the symbol is
9534 really defined in the kept linkonce section.
9535 FIXME: This is quite broken. Modifying the
9536 symbol here means we will be changing all later
9537 uses of the symbol, not just in this section. */
9538 if (action_discarded & PRETEND)
9542 kept = _bfd_elf_check_kept_section (sec,
9554 /* Relocate the section by invoking a back end routine.
9556 The back end routine is responsible for adjusting the
9557 section contents as necessary, and (if using Rela relocs
9558 and generating a relocatable output file) adjusting the
9559 reloc addend as necessary.
9561 The back end routine does not have to worry about setting
9562 the reloc address or the reloc symbol index.
9564 The back end routine is given a pointer to the swapped in
9565 internal symbols, and can access the hash table entries
9566 for the external symbols via elf_sym_hashes (input_bfd).
9568 When generating relocatable output, the back end routine
9569 must handle STB_LOCAL/STT_SECTION symbols specially. The
9570 output symbol is going to be a section symbol
9571 corresponding to the output section, which will require
9572 the addend to be adjusted. */
9574 ret = (*relocate_section) (output_bfd, finfo->info,
9575 input_bfd, o, contents,
9583 || finfo->info->relocatable
9584 || finfo->info->emitrelocations)
9586 Elf_Internal_Rela *irela;
9587 Elf_Internal_Rela *irelaend, *irelamid;
9588 bfd_vma last_offset;
9589 struct elf_link_hash_entry **rel_hash;
9590 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
9591 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
9592 unsigned int next_erel;
9593 bfd_boolean rela_normal;
9594 struct bfd_elf_section_data *esdi, *esdo;
9596 esdi = elf_section_data (o);
9597 esdo = elf_section_data (o->output_section);
9598 rela_normal = FALSE;
9600 /* Adjust the reloc addresses and symbol indices. */
9602 irela = internal_relocs;
9603 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9604 rel_hash = esdo->rel.hashes + esdo->rel.count;
9605 /* We start processing the REL relocs, if any. When we reach
9606 IRELAMID in the loop, we switch to the RELA relocs. */
9608 if (esdi->rel.hdr != NULL)
9609 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
9610 * bed->s->int_rels_per_ext_rel);
9611 rel_hash_list = rel_hash;
9612 rela_hash_list = NULL;
9613 last_offset = o->output_offset;
9614 if (!finfo->info->relocatable)
9615 last_offset += o->output_section->vma;
9616 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9618 unsigned long r_symndx;
9620 Elf_Internal_Sym sym;
9622 if (next_erel == bed->s->int_rels_per_ext_rel)
9628 if (irela == irelamid)
9630 rel_hash = esdo->rela.hashes + esdo->rela.count;
9631 rela_hash_list = rel_hash;
9632 rela_normal = bed->rela_normal;
9635 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9638 if (irela->r_offset >= (bfd_vma) -2)
9640 /* This is a reloc for a deleted entry or somesuch.
9641 Turn it into an R_*_NONE reloc, at the same
9642 offset as the last reloc. elf_eh_frame.c and
9643 bfd_elf_discard_info rely on reloc offsets
9645 irela->r_offset = last_offset;
9647 irela->r_addend = 0;
9651 irela->r_offset += o->output_offset;
9653 /* Relocs in an executable have to be virtual addresses. */
9654 if (!finfo->info->relocatable)
9655 irela->r_offset += o->output_section->vma;
9657 last_offset = irela->r_offset;
9659 r_symndx = irela->r_info >> r_sym_shift;
9660 if (r_symndx == STN_UNDEF)
9663 if (r_symndx >= locsymcount
9664 || (elf_bad_symtab (input_bfd)
9665 && finfo->sections[r_symndx] == NULL))
9667 struct elf_link_hash_entry *rh;
9670 /* This is a reloc against a global symbol. We
9671 have not yet output all the local symbols, so
9672 we do not know the symbol index of any global
9673 symbol. We set the rel_hash entry for this
9674 reloc to point to the global hash table entry
9675 for this symbol. The symbol index is then
9676 set at the end of bfd_elf_final_link. */
9677 indx = r_symndx - extsymoff;
9678 rh = elf_sym_hashes (input_bfd)[indx];
9679 while (rh->root.type == bfd_link_hash_indirect
9680 || rh->root.type == bfd_link_hash_warning)
9681 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
9683 /* Setting the index to -2 tells
9684 elf_link_output_extsym that this symbol is
9686 BFD_ASSERT (rh->indx < 0);
9694 /* This is a reloc against a local symbol. */
9697 sym = isymbuf[r_symndx];
9698 sec = finfo->sections[r_symndx];
9699 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
9701 /* I suppose the backend ought to fill in the
9702 section of any STT_SECTION symbol against a
9703 processor specific section. */
9704 r_symndx = STN_UNDEF;
9705 if (bfd_is_abs_section (sec))
9707 else if (sec == NULL || sec->owner == NULL)
9709 bfd_set_error (bfd_error_bad_value);
9714 asection *osec = sec->output_section;
9716 /* If we have discarded a section, the output
9717 section will be the absolute section. In
9718 case of discarded SEC_MERGE sections, use
9719 the kept section. relocate_section should
9720 have already handled discarded linkonce
9722 if (bfd_is_abs_section (osec)
9723 && sec->kept_section != NULL
9724 && sec->kept_section->output_section != NULL)
9726 osec = sec->kept_section->output_section;
9727 irela->r_addend -= osec->vma;
9730 if (!bfd_is_abs_section (osec))
9732 r_symndx = osec->target_index;
9733 if (r_symndx == STN_UNDEF)
9735 struct elf_link_hash_table *htab;
9738 htab = elf_hash_table (finfo->info);
9739 oi = htab->text_index_section;
9740 if ((osec->flags & SEC_READONLY) == 0
9741 && htab->data_index_section != NULL)
9742 oi = htab->data_index_section;
9746 irela->r_addend += osec->vma - oi->vma;
9747 r_symndx = oi->target_index;
9751 BFD_ASSERT (r_symndx != STN_UNDEF);
9755 /* Adjust the addend according to where the
9756 section winds up in the output section. */
9758 irela->r_addend += sec->output_offset;
9762 if (finfo->indices[r_symndx] == -1)
9764 unsigned long shlink;
9769 if (finfo->info->strip == strip_all)
9771 /* You can't do ld -r -s. */
9772 bfd_set_error (bfd_error_invalid_operation);
9776 /* This symbol was skipped earlier, but
9777 since it is needed by a reloc, we
9778 must output it now. */
9779 shlink = symtab_hdr->sh_link;
9780 name = (bfd_elf_string_from_elf_section
9781 (input_bfd, shlink, sym.st_name));
9785 osec = sec->output_section;
9787 _bfd_elf_section_from_bfd_section (output_bfd,
9789 if (sym.st_shndx == SHN_BAD)
9792 sym.st_value += sec->output_offset;
9793 if (! finfo->info->relocatable)
9795 sym.st_value += osec->vma;
9796 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
9798 /* STT_TLS symbols are relative to PT_TLS
9800 BFD_ASSERT (elf_hash_table (finfo->info)
9802 sym.st_value -= (elf_hash_table (finfo->info)
9807 indx = bfd_get_symcount (output_bfd);
9808 ret = elf_link_output_sym (finfo, name, &sym, sec,
9813 finfo->indices[r_symndx] = indx;
9818 r_symndx = finfo->indices[r_symndx];
9821 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
9822 | (irela->r_info & r_type_mask));
9825 /* Swap out the relocs. */
9826 input_rel_hdr = esdi->rel.hdr;
9827 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
9829 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9834 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
9835 * bed->s->int_rels_per_ext_rel);
9836 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
9839 input_rela_hdr = esdi->rela.hdr;
9840 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
9842 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9851 /* Write out the modified section contents. */
9852 if (bed->elf_backend_write_section
9853 && (*bed->elf_backend_write_section) (output_bfd, finfo->info, o,
9856 /* Section written out. */
9858 else switch (o->sec_info_type)
9860 case ELF_INFO_TYPE_STABS:
9861 if (! (_bfd_write_section_stabs
9863 &elf_hash_table (finfo->info)->stab_info,
9864 o, &elf_section_data (o)->sec_info, contents)))
9867 case ELF_INFO_TYPE_MERGE:
9868 if (! _bfd_write_merged_section (output_bfd, o,
9869 elf_section_data (o)->sec_info))
9872 case ELF_INFO_TYPE_EH_FRAME:
9874 if (! _bfd_elf_write_section_eh_frame (output_bfd, finfo->info,
9881 /* FIXME: octets_per_byte. */
9882 if (! (o->flags & SEC_EXCLUDE)
9883 && ! bfd_set_section_contents (output_bfd, o->output_section,
9885 (file_ptr) o->output_offset,
9896 /* Generate a reloc when linking an ELF file. This is a reloc
9897 requested by the linker, and does not come from any input file. This
9898 is used to build constructor and destructor tables when linking
9902 elf_reloc_link_order (bfd *output_bfd,
9903 struct bfd_link_info *info,
9904 asection *output_section,
9905 struct bfd_link_order *link_order)
9907 reloc_howto_type *howto;
9911 struct bfd_elf_section_reloc_data *reldata;
9912 struct elf_link_hash_entry **rel_hash_ptr;
9913 Elf_Internal_Shdr *rel_hdr;
9914 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
9915 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
9918 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
9920 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
9923 bfd_set_error (bfd_error_bad_value);
9927 addend = link_order->u.reloc.p->addend;
9930 reldata = &esdo->rel;
9931 else if (esdo->rela.hdr)
9932 reldata = &esdo->rela;
9939 /* Figure out the symbol index. */
9940 rel_hash_ptr = reldata->hashes + reldata->count;
9941 if (link_order->type == bfd_section_reloc_link_order)
9943 indx = link_order->u.reloc.p->u.section->target_index;
9944 BFD_ASSERT (indx != 0);
9945 *rel_hash_ptr = NULL;
9949 struct elf_link_hash_entry *h;
9951 /* Treat a reloc against a defined symbol as though it were
9952 actually against the section. */
9953 h = ((struct elf_link_hash_entry *)
9954 bfd_wrapped_link_hash_lookup (output_bfd, info,
9955 link_order->u.reloc.p->u.name,
9956 FALSE, FALSE, TRUE));
9958 && (h->root.type == bfd_link_hash_defined
9959 || h->root.type == bfd_link_hash_defweak))
9963 section = h->root.u.def.section;
9964 indx = section->output_section->target_index;
9965 *rel_hash_ptr = NULL;
9966 /* It seems that we ought to add the symbol value to the
9967 addend here, but in practice it has already been added
9968 because it was passed to constructor_callback. */
9969 addend += section->output_section->vma + section->output_offset;
9973 /* Setting the index to -2 tells elf_link_output_extsym that
9974 this symbol is used by a reloc. */
9981 if (! ((*info->callbacks->unattached_reloc)
9982 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
9988 /* If this is an inplace reloc, we must write the addend into the
9990 if (howto->partial_inplace && addend != 0)
9993 bfd_reloc_status_type rstat;
9996 const char *sym_name;
9998 size = (bfd_size_type) bfd_get_reloc_size (howto);
9999 buf = (bfd_byte *) bfd_zmalloc (size);
10002 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10009 case bfd_reloc_outofrange:
10012 case bfd_reloc_overflow:
10013 if (link_order->type == bfd_section_reloc_link_order)
10014 sym_name = bfd_section_name (output_bfd,
10015 link_order->u.reloc.p->u.section);
10017 sym_name = link_order->u.reloc.p->u.name;
10018 if (! ((*info->callbacks->reloc_overflow)
10019 (info, NULL, sym_name, howto->name, addend, NULL,
10020 NULL, (bfd_vma) 0)))
10027 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10028 link_order->offset, size);
10034 /* The address of a reloc is relative to the section in a
10035 relocatable file, and is a virtual address in an executable
10037 offset = link_order->offset;
10038 if (! info->relocatable)
10039 offset += output_section->vma;
10041 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10043 irel[i].r_offset = offset;
10044 irel[i].r_info = 0;
10045 irel[i].r_addend = 0;
10047 if (bed->s->arch_size == 32)
10048 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10050 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10052 rel_hdr = reldata->hdr;
10053 erel = rel_hdr->contents;
10054 if (rel_hdr->sh_type == SHT_REL)
10056 erel += reldata->count * bed->s->sizeof_rel;
10057 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10061 irel[0].r_addend = addend;
10062 erel += reldata->count * bed->s->sizeof_rela;
10063 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10072 /* Get the output vma of the section pointed to by the sh_link field. */
10075 elf_get_linked_section_vma (struct bfd_link_order *p)
10077 Elf_Internal_Shdr **elf_shdrp;
10081 s = p->u.indirect.section;
10082 elf_shdrp = elf_elfsections (s->owner);
10083 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10084 elfsec = elf_shdrp[elfsec]->sh_link;
10086 The Intel C compiler generates SHT_IA_64_UNWIND with
10087 SHF_LINK_ORDER. But it doesn't set the sh_link or
10088 sh_info fields. Hence we could get the situation
10089 where elfsec is 0. */
10092 const struct elf_backend_data *bed
10093 = get_elf_backend_data (s->owner);
10094 if (bed->link_order_error_handler)
10095 bed->link_order_error_handler
10096 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10101 s = elf_shdrp[elfsec]->bfd_section;
10102 return s->output_section->vma + s->output_offset;
10107 /* Compare two sections based on the locations of the sections they are
10108 linked to. Used by elf_fixup_link_order. */
10111 compare_link_order (const void * a, const void * b)
10116 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10117 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10120 return apos > bpos;
10124 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10125 order as their linked sections. Returns false if this could not be done
10126 because an output section includes both ordered and unordered
10127 sections. Ideally we'd do this in the linker proper. */
10130 elf_fixup_link_order (bfd *abfd, asection *o)
10132 int seen_linkorder;
10135 struct bfd_link_order *p;
10137 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10139 struct bfd_link_order **sections;
10140 asection *s, *other_sec, *linkorder_sec;
10144 linkorder_sec = NULL;
10146 seen_linkorder = 0;
10147 for (p = o->map_head.link_order; p != NULL; p = p->next)
10149 if (p->type == bfd_indirect_link_order)
10151 s = p->u.indirect.section;
10153 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10154 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10155 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10156 && elfsec < elf_numsections (sub)
10157 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10158 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10172 if (seen_other && seen_linkorder)
10174 if (other_sec && linkorder_sec)
10175 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10177 linkorder_sec->owner, other_sec,
10180 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10182 bfd_set_error (bfd_error_bad_value);
10187 if (!seen_linkorder)
10190 sections = (struct bfd_link_order **)
10191 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10192 if (sections == NULL)
10194 seen_linkorder = 0;
10196 for (p = o->map_head.link_order; p != NULL; p = p->next)
10198 sections[seen_linkorder++] = p;
10200 /* Sort the input sections in the order of their linked section. */
10201 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10202 compare_link_order);
10204 /* Change the offsets of the sections. */
10206 for (n = 0; n < seen_linkorder; n++)
10208 s = sections[n]->u.indirect.section;
10209 offset &= ~(bfd_vma) 0 << s->alignment_power;
10210 s->output_offset = offset;
10211 sections[n]->offset = offset;
10212 /* FIXME: octets_per_byte. */
10213 offset += sections[n]->size;
10221 /* Do the final step of an ELF link. */
10224 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10226 bfd_boolean dynamic;
10227 bfd_boolean emit_relocs;
10229 struct elf_final_link_info finfo;
10231 struct bfd_link_order *p;
10233 bfd_size_type max_contents_size;
10234 bfd_size_type max_external_reloc_size;
10235 bfd_size_type max_internal_reloc_count;
10236 bfd_size_type max_sym_count;
10237 bfd_size_type max_sym_shndx_count;
10239 Elf_Internal_Sym elfsym;
10241 Elf_Internal_Shdr *symtab_hdr;
10242 Elf_Internal_Shdr *symtab_shndx_hdr;
10243 Elf_Internal_Shdr *symstrtab_hdr;
10244 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10245 struct elf_outext_info eoinfo;
10246 bfd_boolean merged;
10247 size_t relativecount = 0;
10248 asection *reldyn = 0;
10250 asection *attr_section = NULL;
10251 bfd_vma attr_size = 0;
10252 const char *std_attrs_section;
10254 if (! is_elf_hash_table (info->hash))
10258 abfd->flags |= DYNAMIC;
10260 dynamic = elf_hash_table (info)->dynamic_sections_created;
10261 dynobj = elf_hash_table (info)->dynobj;
10263 emit_relocs = (info->relocatable
10264 || info->emitrelocations);
10267 finfo.output_bfd = abfd;
10268 finfo.symstrtab = _bfd_elf_stringtab_init ();
10269 if (finfo.symstrtab == NULL)
10274 finfo.dynsym_sec = NULL;
10275 finfo.hash_sec = NULL;
10276 finfo.symver_sec = NULL;
10280 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
10281 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
10282 BFD_ASSERT (finfo.dynsym_sec != NULL);
10283 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
10284 /* Note that it is OK if symver_sec is NULL. */
10287 finfo.contents = NULL;
10288 finfo.external_relocs = NULL;
10289 finfo.internal_relocs = NULL;
10290 finfo.external_syms = NULL;
10291 finfo.locsym_shndx = NULL;
10292 finfo.internal_syms = NULL;
10293 finfo.indices = NULL;
10294 finfo.sections = NULL;
10295 finfo.symbuf = NULL;
10296 finfo.symshndxbuf = NULL;
10297 finfo.symbuf_count = 0;
10298 finfo.shndxbuf_size = 0;
10300 /* The object attributes have been merged. Remove the input
10301 sections from the link, and set the contents of the output
10303 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10304 for (o = abfd->sections; o != NULL; o = o->next)
10306 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10307 || strcmp (o->name, ".gnu.attributes") == 0)
10309 for (p = o->map_head.link_order; p != NULL; p = p->next)
10311 asection *input_section;
10313 if (p->type != bfd_indirect_link_order)
10315 input_section = p->u.indirect.section;
10316 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10317 elf_link_input_bfd ignores this section. */
10318 input_section->flags &= ~SEC_HAS_CONTENTS;
10321 attr_size = bfd_elf_obj_attr_size (abfd);
10324 bfd_set_section_size (abfd, o, attr_size);
10326 /* Skip this section later on. */
10327 o->map_head.link_order = NULL;
10330 o->flags |= SEC_EXCLUDE;
10334 /* Count up the number of relocations we will output for each output
10335 section, so that we know the sizes of the reloc sections. We
10336 also figure out some maximum sizes. */
10337 max_contents_size = 0;
10338 max_external_reloc_size = 0;
10339 max_internal_reloc_count = 0;
10341 max_sym_shndx_count = 0;
10343 for (o = abfd->sections; o != NULL; o = o->next)
10345 struct bfd_elf_section_data *esdo = elf_section_data (o);
10346 o->reloc_count = 0;
10348 for (p = o->map_head.link_order; p != NULL; p = p->next)
10350 unsigned int reloc_count = 0;
10351 struct bfd_elf_section_data *esdi = NULL;
10353 if (p->type == bfd_section_reloc_link_order
10354 || p->type == bfd_symbol_reloc_link_order)
10356 else if (p->type == bfd_indirect_link_order)
10360 sec = p->u.indirect.section;
10361 esdi = elf_section_data (sec);
10363 /* Mark all sections which are to be included in the
10364 link. This will normally be every section. We need
10365 to do this so that we can identify any sections which
10366 the linker has decided to not include. */
10367 sec->linker_mark = TRUE;
10369 if (sec->flags & SEC_MERGE)
10372 if (info->relocatable || info->emitrelocations)
10373 reloc_count = sec->reloc_count;
10374 else if (bed->elf_backend_count_relocs)
10375 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10377 if (sec->rawsize > max_contents_size)
10378 max_contents_size = sec->rawsize;
10379 if (sec->size > max_contents_size)
10380 max_contents_size = sec->size;
10382 /* We are interested in just local symbols, not all
10384 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10385 && (sec->owner->flags & DYNAMIC) == 0)
10389 if (elf_bad_symtab (sec->owner))
10390 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10391 / bed->s->sizeof_sym);
10393 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10395 if (sym_count > max_sym_count)
10396 max_sym_count = sym_count;
10398 if (sym_count > max_sym_shndx_count
10399 && elf_symtab_shndx (sec->owner) != 0)
10400 max_sym_shndx_count = sym_count;
10402 if ((sec->flags & SEC_RELOC) != 0)
10404 size_t ext_size = 0;
10406 if (esdi->rel.hdr != NULL)
10407 ext_size = esdi->rel.hdr->sh_size;
10408 if (esdi->rela.hdr != NULL)
10409 ext_size += esdi->rela.hdr->sh_size;
10411 if (ext_size > max_external_reloc_size)
10412 max_external_reloc_size = ext_size;
10413 if (sec->reloc_count > max_internal_reloc_count)
10414 max_internal_reloc_count = sec->reloc_count;
10419 if (reloc_count == 0)
10422 o->reloc_count += reloc_count;
10424 if (p->type == bfd_indirect_link_order
10425 && (info->relocatable || info->emitrelocations))
10428 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
10429 if (esdi->rela.hdr)
10430 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
10435 esdo->rela.count += reloc_count;
10437 esdo->rel.count += reloc_count;
10441 if (o->reloc_count > 0)
10442 o->flags |= SEC_RELOC;
10445 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10446 set it (this is probably a bug) and if it is set
10447 assign_section_numbers will create a reloc section. */
10448 o->flags &=~ SEC_RELOC;
10451 /* If the SEC_ALLOC flag is not set, force the section VMA to
10452 zero. This is done in elf_fake_sections as well, but forcing
10453 the VMA to 0 here will ensure that relocs against these
10454 sections are handled correctly. */
10455 if ((o->flags & SEC_ALLOC) == 0
10456 && ! o->user_set_vma)
10460 if (! info->relocatable && merged)
10461 elf_link_hash_traverse (elf_hash_table (info),
10462 _bfd_elf_link_sec_merge_syms, abfd);
10464 /* Figure out the file positions for everything but the symbol table
10465 and the relocs. We set symcount to force assign_section_numbers
10466 to create a symbol table. */
10467 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
10468 BFD_ASSERT (! abfd->output_has_begun);
10469 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10472 /* Set sizes, and assign file positions for reloc sections. */
10473 for (o = abfd->sections; o != NULL; o = o->next)
10475 struct bfd_elf_section_data *esdo = elf_section_data (o);
10476 if ((o->flags & SEC_RELOC) != 0)
10479 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
10483 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
10487 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10488 to count upwards while actually outputting the relocations. */
10489 esdo->rel.count = 0;
10490 esdo->rela.count = 0;
10493 _bfd_elf_assign_file_positions_for_relocs (abfd);
10495 /* We have now assigned file positions for all the sections except
10496 .symtab and .strtab. We start the .symtab section at the current
10497 file position, and write directly to it. We build the .strtab
10498 section in memory. */
10499 bfd_get_symcount (abfd) = 0;
10500 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10501 /* sh_name is set in prep_headers. */
10502 symtab_hdr->sh_type = SHT_SYMTAB;
10503 /* sh_flags, sh_addr and sh_size all start off zero. */
10504 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10505 /* sh_link is set in assign_section_numbers. */
10506 /* sh_info is set below. */
10507 /* sh_offset is set just below. */
10508 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10510 off = elf_tdata (abfd)->next_file_pos;
10511 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10513 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10514 incorrect. We do not yet know the size of the .symtab section.
10515 We correct next_file_pos below, after we do know the size. */
10517 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10518 continuously seeking to the right position in the file. */
10519 if (! info->keep_memory || max_sym_count < 20)
10520 finfo.symbuf_size = 20;
10522 finfo.symbuf_size = max_sym_count;
10523 amt = finfo.symbuf_size;
10524 amt *= bed->s->sizeof_sym;
10525 finfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10526 if (finfo.symbuf == NULL)
10528 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10530 /* Wild guess at number of output symbols. realloc'd as needed. */
10531 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10532 finfo.shndxbuf_size = amt;
10533 amt *= sizeof (Elf_External_Sym_Shndx);
10534 finfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10535 if (finfo.symshndxbuf == NULL)
10539 /* Start writing out the symbol table. The first symbol is always a
10541 if (info->strip != strip_all
10544 elfsym.st_value = 0;
10545 elfsym.st_size = 0;
10546 elfsym.st_info = 0;
10547 elfsym.st_other = 0;
10548 elfsym.st_shndx = SHN_UNDEF;
10549 if (elf_link_output_sym (&finfo, NULL, &elfsym, bfd_und_section_ptr,
10554 /* Output a symbol for each section. We output these even if we are
10555 discarding local symbols, since they are used for relocs. These
10556 symbols have no names. We store the index of each one in the
10557 index field of the section, so that we can find it again when
10558 outputting relocs. */
10559 if (info->strip != strip_all
10562 elfsym.st_size = 0;
10563 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10564 elfsym.st_other = 0;
10565 elfsym.st_value = 0;
10566 for (i = 1; i < elf_numsections (abfd); i++)
10568 o = bfd_section_from_elf_index (abfd, i);
10571 o->target_index = bfd_get_symcount (abfd);
10572 elfsym.st_shndx = i;
10573 if (!info->relocatable)
10574 elfsym.st_value = o->vma;
10575 if (elf_link_output_sym (&finfo, NULL, &elfsym, o, NULL) != 1)
10581 /* Allocate some memory to hold information read in from the input
10583 if (max_contents_size != 0)
10585 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10586 if (finfo.contents == NULL)
10590 if (max_external_reloc_size != 0)
10592 finfo.external_relocs = bfd_malloc (max_external_reloc_size);
10593 if (finfo.external_relocs == NULL)
10597 if (max_internal_reloc_count != 0)
10599 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10600 amt *= sizeof (Elf_Internal_Rela);
10601 finfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10602 if (finfo.internal_relocs == NULL)
10606 if (max_sym_count != 0)
10608 amt = max_sym_count * bed->s->sizeof_sym;
10609 finfo.external_syms = (bfd_byte *) bfd_malloc (amt);
10610 if (finfo.external_syms == NULL)
10613 amt = max_sym_count * sizeof (Elf_Internal_Sym);
10614 finfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
10615 if (finfo.internal_syms == NULL)
10618 amt = max_sym_count * sizeof (long);
10619 finfo.indices = (long int *) bfd_malloc (amt);
10620 if (finfo.indices == NULL)
10623 amt = max_sym_count * sizeof (asection *);
10624 finfo.sections = (asection **) bfd_malloc (amt);
10625 if (finfo.sections == NULL)
10629 if (max_sym_shndx_count != 0)
10631 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
10632 finfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
10633 if (finfo.locsym_shndx == NULL)
10637 if (elf_hash_table (info)->tls_sec)
10639 bfd_vma base, end = 0;
10642 for (sec = elf_hash_table (info)->tls_sec;
10643 sec && (sec->flags & SEC_THREAD_LOCAL);
10646 bfd_size_type size = sec->size;
10649 && (sec->flags & SEC_HAS_CONTENTS) == 0)
10651 struct bfd_link_order *ord = sec->map_tail.link_order;
10654 size = ord->offset + ord->size;
10656 end = sec->vma + size;
10658 base = elf_hash_table (info)->tls_sec->vma;
10659 /* Only align end of TLS section if static TLS doesn't have special
10660 alignment requirements. */
10661 if (bed->static_tls_alignment == 1)
10662 end = align_power (end,
10663 elf_hash_table (info)->tls_sec->alignment_power);
10664 elf_hash_table (info)->tls_size = end - base;
10667 /* Reorder SHF_LINK_ORDER sections. */
10668 for (o = abfd->sections; o != NULL; o = o->next)
10670 if (!elf_fixup_link_order (abfd, o))
10674 /* Since ELF permits relocations to be against local symbols, we
10675 must have the local symbols available when we do the relocations.
10676 Since we would rather only read the local symbols once, and we
10677 would rather not keep them in memory, we handle all the
10678 relocations for a single input file at the same time.
10680 Unfortunately, there is no way to know the total number of local
10681 symbols until we have seen all of them, and the local symbol
10682 indices precede the global symbol indices. This means that when
10683 we are generating relocatable output, and we see a reloc against
10684 a global symbol, we can not know the symbol index until we have
10685 finished examining all the local symbols to see which ones we are
10686 going to output. To deal with this, we keep the relocations in
10687 memory, and don't output them until the end of the link. This is
10688 an unfortunate waste of memory, but I don't see a good way around
10689 it. Fortunately, it only happens when performing a relocatable
10690 link, which is not the common case. FIXME: If keep_memory is set
10691 we could write the relocs out and then read them again; I don't
10692 know how bad the memory loss will be. */
10694 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10695 sub->output_has_begun = FALSE;
10696 for (o = abfd->sections; o != NULL; o = o->next)
10698 for (p = o->map_head.link_order; p != NULL; p = p->next)
10700 if (p->type == bfd_indirect_link_order
10701 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
10702 == bfd_target_elf_flavour)
10703 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
10705 if (! sub->output_has_begun)
10707 if (! elf_link_input_bfd (&finfo, sub))
10709 sub->output_has_begun = TRUE;
10712 else if (p->type == bfd_section_reloc_link_order
10713 || p->type == bfd_symbol_reloc_link_order)
10715 if (! elf_reloc_link_order (abfd, info, o, p))
10720 if (! _bfd_default_link_order (abfd, info, o, p))
10726 /* Free symbol buffer if needed. */
10727 if (!info->reduce_memory_overheads)
10729 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10730 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10731 && elf_tdata (sub)->symbuf)
10733 free (elf_tdata (sub)->symbuf);
10734 elf_tdata (sub)->symbuf = NULL;
10738 /* Output any global symbols that got converted to local in a
10739 version script or due to symbol visibility. We do this in a
10740 separate step since ELF requires all local symbols to appear
10741 prior to any global symbols. FIXME: We should only do this if
10742 some global symbols were, in fact, converted to become local.
10743 FIXME: Will this work correctly with the Irix 5 linker? */
10744 eoinfo.failed = FALSE;
10745 eoinfo.finfo = &finfo;
10746 eoinfo.localsyms = TRUE;
10747 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
10752 /* If backend needs to output some local symbols not present in the hash
10753 table, do it now. */
10754 if (bed->elf_backend_output_arch_local_syms)
10756 typedef int (*out_sym_func)
10757 (void *, const char *, Elf_Internal_Sym *, asection *,
10758 struct elf_link_hash_entry *);
10760 if (! ((*bed->elf_backend_output_arch_local_syms)
10761 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
10765 /* That wrote out all the local symbols. Finish up the symbol table
10766 with the global symbols. Even if we want to strip everything we
10767 can, we still need to deal with those global symbols that got
10768 converted to local in a version script. */
10770 /* The sh_info field records the index of the first non local symbol. */
10771 symtab_hdr->sh_info = bfd_get_symcount (abfd);
10774 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
10776 Elf_Internal_Sym sym;
10777 bfd_byte *dynsym = finfo.dynsym_sec->contents;
10778 long last_local = 0;
10780 /* Write out the section symbols for the output sections. */
10781 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
10787 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10790 for (s = abfd->sections; s != NULL; s = s->next)
10796 dynindx = elf_section_data (s)->dynindx;
10799 indx = elf_section_data (s)->this_idx;
10800 BFD_ASSERT (indx > 0);
10801 sym.st_shndx = indx;
10802 if (! check_dynsym (abfd, &sym))
10804 sym.st_value = s->vma;
10805 dest = dynsym + dynindx * bed->s->sizeof_sym;
10806 if (last_local < dynindx)
10807 last_local = dynindx;
10808 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10812 /* Write out the local dynsyms. */
10813 if (elf_hash_table (info)->dynlocal)
10815 struct elf_link_local_dynamic_entry *e;
10816 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
10821 /* Copy the internal symbol and turn off visibility.
10822 Note that we saved a word of storage and overwrote
10823 the original st_name with the dynstr_index. */
10825 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
10827 s = bfd_section_from_elf_index (e->input_bfd,
10832 elf_section_data (s->output_section)->this_idx;
10833 if (! check_dynsym (abfd, &sym))
10835 sym.st_value = (s->output_section->vma
10837 + e->isym.st_value);
10840 if (last_local < e->dynindx)
10841 last_local = e->dynindx;
10843 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
10844 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10848 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
10852 /* We get the global symbols from the hash table. */
10853 eoinfo.failed = FALSE;
10854 eoinfo.localsyms = FALSE;
10855 eoinfo.finfo = &finfo;
10856 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
10861 /* If backend needs to output some symbols not present in the hash
10862 table, do it now. */
10863 if (bed->elf_backend_output_arch_syms)
10865 typedef int (*out_sym_func)
10866 (void *, const char *, Elf_Internal_Sym *, asection *,
10867 struct elf_link_hash_entry *);
10869 if (! ((*bed->elf_backend_output_arch_syms)
10870 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
10874 /* Flush all symbols to the file. */
10875 if (! elf_link_flush_output_syms (&finfo, bed))
10878 /* Now we know the size of the symtab section. */
10879 off += symtab_hdr->sh_size;
10881 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
10882 if (symtab_shndx_hdr->sh_name != 0)
10884 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
10885 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
10886 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
10887 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
10888 symtab_shndx_hdr->sh_size = amt;
10890 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
10893 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
10894 || (bfd_bwrite (finfo.symshndxbuf, amt, abfd) != amt))
10899 /* Finish up and write out the symbol string table (.strtab)
10901 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
10902 /* sh_name was set in prep_headers. */
10903 symstrtab_hdr->sh_type = SHT_STRTAB;
10904 symstrtab_hdr->sh_flags = 0;
10905 symstrtab_hdr->sh_addr = 0;
10906 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
10907 symstrtab_hdr->sh_entsize = 0;
10908 symstrtab_hdr->sh_link = 0;
10909 symstrtab_hdr->sh_info = 0;
10910 /* sh_offset is set just below. */
10911 symstrtab_hdr->sh_addralign = 1;
10913 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
10914 elf_tdata (abfd)->next_file_pos = off;
10916 if (bfd_get_symcount (abfd) > 0)
10918 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
10919 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
10923 /* Adjust the relocs to have the correct symbol indices. */
10924 for (o = abfd->sections; o != NULL; o = o->next)
10926 struct bfd_elf_section_data *esdo = elf_section_data (o);
10927 if ((o->flags & SEC_RELOC) == 0)
10930 if (esdo->rel.hdr != NULL)
10931 elf_link_adjust_relocs (abfd, &esdo->rel);
10932 if (esdo->rela.hdr != NULL)
10933 elf_link_adjust_relocs (abfd, &esdo->rela);
10935 /* Set the reloc_count field to 0 to prevent write_relocs from
10936 trying to swap the relocs out itself. */
10937 o->reloc_count = 0;
10940 if (dynamic && info->combreloc && dynobj != NULL)
10941 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
10943 /* If we are linking against a dynamic object, or generating a
10944 shared library, finish up the dynamic linking information. */
10947 bfd_byte *dyncon, *dynconend;
10949 /* Fix up .dynamic entries. */
10950 o = bfd_get_section_by_name (dynobj, ".dynamic");
10951 BFD_ASSERT (o != NULL);
10953 dyncon = o->contents;
10954 dynconend = o->contents + o->size;
10955 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
10957 Elf_Internal_Dyn dyn;
10961 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
10968 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
10970 switch (elf_section_data (reldyn)->this_hdr.sh_type)
10972 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
10973 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
10976 dyn.d_un.d_val = relativecount;
10983 name = info->init_function;
10986 name = info->fini_function;
10989 struct elf_link_hash_entry *h;
10991 h = elf_link_hash_lookup (elf_hash_table (info), name,
10992 FALSE, FALSE, TRUE);
10994 && (h->root.type == bfd_link_hash_defined
10995 || h->root.type == bfd_link_hash_defweak))
10997 dyn.d_un.d_ptr = h->root.u.def.value;
10998 o = h->root.u.def.section;
10999 if (o->output_section != NULL)
11000 dyn.d_un.d_ptr += (o->output_section->vma
11001 + o->output_offset);
11004 /* The symbol is imported from another shared
11005 library and does not apply to this one. */
11006 dyn.d_un.d_ptr = 0;
11013 case DT_PREINIT_ARRAYSZ:
11014 name = ".preinit_array";
11016 case DT_INIT_ARRAYSZ:
11017 name = ".init_array";
11019 case DT_FINI_ARRAYSZ:
11020 name = ".fini_array";
11022 o = bfd_get_section_by_name (abfd, name);
11025 (*_bfd_error_handler)
11026 (_("%B: could not find output section %s"), abfd, name);
11030 (*_bfd_error_handler)
11031 (_("warning: %s section has zero size"), name);
11032 dyn.d_un.d_val = o->size;
11035 case DT_PREINIT_ARRAY:
11036 name = ".preinit_array";
11038 case DT_INIT_ARRAY:
11039 name = ".init_array";
11041 case DT_FINI_ARRAY:
11042 name = ".fini_array";
11049 name = ".gnu.hash";
11058 name = ".gnu.version_d";
11061 name = ".gnu.version_r";
11064 name = ".gnu.version";
11066 o = bfd_get_section_by_name (abfd, name);
11069 (*_bfd_error_handler)
11070 (_("%B: could not find output section %s"), abfd, name);
11073 dyn.d_un.d_ptr = o->vma;
11080 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11084 dyn.d_un.d_val = 0;
11085 dyn.d_un.d_ptr = 0;
11086 for (i = 1; i < elf_numsections (abfd); i++)
11088 Elf_Internal_Shdr *hdr;
11090 hdr = elf_elfsections (abfd)[i];
11091 if (hdr->sh_type == type
11092 && (hdr->sh_flags & SHF_ALLOC) != 0)
11094 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11095 dyn.d_un.d_val += hdr->sh_size;
11098 if (dyn.d_un.d_ptr == 0
11099 || hdr->sh_addr < dyn.d_un.d_ptr)
11100 dyn.d_un.d_ptr = hdr->sh_addr;
11106 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11110 /* If we have created any dynamic sections, then output them. */
11111 if (dynobj != NULL)
11113 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11116 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11117 if (info->warn_shared_textrel && info->shared)
11119 bfd_byte *dyncon, *dynconend;
11121 /* Fix up .dynamic entries. */
11122 o = bfd_get_section_by_name (dynobj, ".dynamic");
11123 BFD_ASSERT (o != NULL);
11125 dyncon = o->contents;
11126 dynconend = o->contents + o->size;
11127 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11129 Elf_Internal_Dyn dyn;
11131 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11133 if (dyn.d_tag == DT_TEXTREL)
11135 info->callbacks->einfo
11136 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11142 for (o = dynobj->sections; o != NULL; o = o->next)
11144 if ((o->flags & SEC_HAS_CONTENTS) == 0
11146 || o->output_section == bfd_abs_section_ptr)
11148 if ((o->flags & SEC_LINKER_CREATED) == 0)
11150 /* At this point, we are only interested in sections
11151 created by _bfd_elf_link_create_dynamic_sections. */
11154 if (elf_hash_table (info)->stab_info.stabstr == o)
11156 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11158 if ((elf_section_data (o->output_section)->this_hdr.sh_type
11160 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
11162 /* FIXME: octets_per_byte. */
11163 if (! bfd_set_section_contents (abfd, o->output_section,
11165 (file_ptr) o->output_offset,
11171 /* The contents of the .dynstr section are actually in a
11173 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11174 if (bfd_seek (abfd, off, SEEK_SET) != 0
11175 || ! _bfd_elf_strtab_emit (abfd,
11176 elf_hash_table (info)->dynstr))
11182 if (info->relocatable)
11184 bfd_boolean failed = FALSE;
11186 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11191 /* If we have optimized stabs strings, output them. */
11192 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11194 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11198 if (info->eh_frame_hdr)
11200 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11204 if (finfo.symstrtab != NULL)
11205 _bfd_stringtab_free (finfo.symstrtab);
11206 if (finfo.contents != NULL)
11207 free (finfo.contents);
11208 if (finfo.external_relocs != NULL)
11209 free (finfo.external_relocs);
11210 if (finfo.internal_relocs != NULL)
11211 free (finfo.internal_relocs);
11212 if (finfo.external_syms != NULL)
11213 free (finfo.external_syms);
11214 if (finfo.locsym_shndx != NULL)
11215 free (finfo.locsym_shndx);
11216 if (finfo.internal_syms != NULL)
11217 free (finfo.internal_syms);
11218 if (finfo.indices != NULL)
11219 free (finfo.indices);
11220 if (finfo.sections != NULL)
11221 free (finfo.sections);
11222 if (finfo.symbuf != NULL)
11223 free (finfo.symbuf);
11224 if (finfo.symshndxbuf != NULL)
11225 free (finfo.symshndxbuf);
11226 for (o = abfd->sections; o != NULL; o = o->next)
11228 struct bfd_elf_section_data *esdo = elf_section_data (o);
11229 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
11230 free (esdo->rel.hashes);
11231 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
11232 free (esdo->rela.hashes);
11235 elf_tdata (abfd)->linker = TRUE;
11239 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11240 if (contents == NULL)
11241 return FALSE; /* Bail out and fail. */
11242 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11243 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11250 if (finfo.symstrtab != NULL)
11251 _bfd_stringtab_free (finfo.symstrtab);
11252 if (finfo.contents != NULL)
11253 free (finfo.contents);
11254 if (finfo.external_relocs != NULL)
11255 free (finfo.external_relocs);
11256 if (finfo.internal_relocs != NULL)
11257 free (finfo.internal_relocs);
11258 if (finfo.external_syms != NULL)
11259 free (finfo.external_syms);
11260 if (finfo.locsym_shndx != NULL)
11261 free (finfo.locsym_shndx);
11262 if (finfo.internal_syms != NULL)
11263 free (finfo.internal_syms);
11264 if (finfo.indices != NULL)
11265 free (finfo.indices);
11266 if (finfo.sections != NULL)
11267 free (finfo.sections);
11268 if (finfo.symbuf != NULL)
11269 free (finfo.symbuf);
11270 if (finfo.symshndxbuf != NULL)
11271 free (finfo.symshndxbuf);
11272 for (o = abfd->sections; o != NULL; o = o->next)
11274 struct bfd_elf_section_data *esdo = elf_section_data (o);
11275 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
11276 free (esdo->rel.hashes);
11277 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
11278 free (esdo->rela.hashes);
11284 /* Initialize COOKIE for input bfd ABFD. */
11287 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11288 struct bfd_link_info *info, bfd *abfd)
11290 Elf_Internal_Shdr *symtab_hdr;
11291 const struct elf_backend_data *bed;
11293 bed = get_elf_backend_data (abfd);
11294 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11296 cookie->abfd = abfd;
11297 cookie->sym_hashes = elf_sym_hashes (abfd);
11298 cookie->bad_symtab = elf_bad_symtab (abfd);
11299 if (cookie->bad_symtab)
11301 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11302 cookie->extsymoff = 0;
11306 cookie->locsymcount = symtab_hdr->sh_info;
11307 cookie->extsymoff = symtab_hdr->sh_info;
11310 if (bed->s->arch_size == 32)
11311 cookie->r_sym_shift = 8;
11313 cookie->r_sym_shift = 32;
11315 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11316 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11318 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11319 cookie->locsymcount, 0,
11321 if (cookie->locsyms == NULL)
11323 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11326 if (info->keep_memory)
11327 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11332 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11335 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11337 Elf_Internal_Shdr *symtab_hdr;
11339 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11340 if (cookie->locsyms != NULL
11341 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11342 free (cookie->locsyms);
11345 /* Initialize the relocation information in COOKIE for input section SEC
11346 of input bfd ABFD. */
11349 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11350 struct bfd_link_info *info, bfd *abfd,
11353 const struct elf_backend_data *bed;
11355 if (sec->reloc_count == 0)
11357 cookie->rels = NULL;
11358 cookie->relend = NULL;
11362 bed = get_elf_backend_data (abfd);
11364 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11365 info->keep_memory);
11366 if (cookie->rels == NULL)
11368 cookie->rel = cookie->rels;
11369 cookie->relend = (cookie->rels
11370 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11372 cookie->rel = cookie->rels;
11376 /* Free the memory allocated by init_reloc_cookie_rels,
11380 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11383 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11384 free (cookie->rels);
11387 /* Initialize the whole of COOKIE for input section SEC. */
11390 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11391 struct bfd_link_info *info,
11394 if (!init_reloc_cookie (cookie, info, sec->owner))
11396 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11401 fini_reloc_cookie (cookie, sec->owner);
11406 /* Free the memory allocated by init_reloc_cookie_for_section,
11410 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11413 fini_reloc_cookie_rels (cookie, sec);
11414 fini_reloc_cookie (cookie, sec->owner);
11417 /* Garbage collect unused sections. */
11419 /* Default gc_mark_hook. */
11422 _bfd_elf_gc_mark_hook (asection *sec,
11423 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11424 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11425 struct elf_link_hash_entry *h,
11426 Elf_Internal_Sym *sym)
11428 const char *sec_name;
11432 switch (h->root.type)
11434 case bfd_link_hash_defined:
11435 case bfd_link_hash_defweak:
11436 return h->root.u.def.section;
11438 case bfd_link_hash_common:
11439 return h->root.u.c.p->section;
11441 case bfd_link_hash_undefined:
11442 case bfd_link_hash_undefweak:
11443 /* To work around a glibc bug, keep all XXX input sections
11444 when there is an as yet undefined reference to __start_XXX
11445 or __stop_XXX symbols. The linker will later define such
11446 symbols for orphan input sections that have a name
11447 representable as a C identifier. */
11448 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11449 sec_name = h->root.root.string + 8;
11450 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11451 sec_name = h->root.root.string + 7;
11455 if (sec_name && *sec_name != '\0')
11459 for (i = info->input_bfds; i; i = i->link_next)
11461 sec = bfd_get_section_by_name (i, sec_name);
11463 sec->flags |= SEC_KEEP;
11473 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11478 /* COOKIE->rel describes a relocation against section SEC, which is
11479 a section we've decided to keep. Return the section that contains
11480 the relocation symbol, or NULL if no section contains it. */
11483 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11484 elf_gc_mark_hook_fn gc_mark_hook,
11485 struct elf_reloc_cookie *cookie)
11487 unsigned long r_symndx;
11488 struct elf_link_hash_entry *h;
11490 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11491 if (r_symndx == STN_UNDEF)
11494 if (r_symndx >= cookie->locsymcount
11495 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11497 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11498 while (h->root.type == bfd_link_hash_indirect
11499 || h->root.type == bfd_link_hash_warning)
11500 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11501 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11504 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11505 &cookie->locsyms[r_symndx]);
11508 /* COOKIE->rel describes a relocation against section SEC, which is
11509 a section we've decided to keep. Mark the section that contains
11510 the relocation symbol. */
11513 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11515 elf_gc_mark_hook_fn gc_mark_hook,
11516 struct elf_reloc_cookie *cookie)
11520 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11521 if (rsec && !rsec->gc_mark)
11523 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
11525 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11531 /* The mark phase of garbage collection. For a given section, mark
11532 it and any sections in this section's group, and all the sections
11533 which define symbols to which it refers. */
11536 _bfd_elf_gc_mark (struct bfd_link_info *info,
11538 elf_gc_mark_hook_fn gc_mark_hook)
11541 asection *group_sec, *eh_frame;
11545 /* Mark all the sections in the group. */
11546 group_sec = elf_section_data (sec)->next_in_group;
11547 if (group_sec && !group_sec->gc_mark)
11548 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11551 /* Look through the section relocs. */
11553 eh_frame = elf_eh_frame_section (sec->owner);
11554 if ((sec->flags & SEC_RELOC) != 0
11555 && sec->reloc_count > 0
11556 && sec != eh_frame)
11558 struct elf_reloc_cookie cookie;
11560 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11564 for (; cookie.rel < cookie.relend; cookie.rel++)
11565 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11570 fini_reloc_cookie_for_section (&cookie, sec);
11574 if (ret && eh_frame && elf_fde_list (sec))
11576 struct elf_reloc_cookie cookie;
11578 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11582 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11583 gc_mark_hook, &cookie))
11585 fini_reloc_cookie_for_section (&cookie, eh_frame);
11592 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11594 struct elf_gc_sweep_symbol_info
11596 struct bfd_link_info *info;
11597 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
11602 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
11604 if (h->root.type == bfd_link_hash_warning)
11605 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11607 if ((h->root.type == bfd_link_hash_defined
11608 || h->root.type == bfd_link_hash_defweak)
11609 && !h->root.u.def.section->gc_mark
11610 && !(h->root.u.def.section->owner->flags & DYNAMIC))
11612 struct elf_gc_sweep_symbol_info *inf =
11613 (struct elf_gc_sweep_symbol_info *) data;
11614 (*inf->hide_symbol) (inf->info, h, TRUE);
11620 /* The sweep phase of garbage collection. Remove all garbage sections. */
11622 typedef bfd_boolean (*gc_sweep_hook_fn)
11623 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
11626 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
11629 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11630 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
11631 unsigned long section_sym_count;
11632 struct elf_gc_sweep_symbol_info sweep_info;
11634 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11638 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11641 for (o = sub->sections; o != NULL; o = o->next)
11643 /* When any section in a section group is kept, we keep all
11644 sections in the section group. If the first member of
11645 the section group is excluded, we will also exclude the
11647 if (o->flags & SEC_GROUP)
11649 asection *first = elf_next_in_group (o);
11650 o->gc_mark = first->gc_mark;
11652 else if ((o->flags & (SEC_DEBUGGING | SEC_LINKER_CREATED)) != 0
11653 || (o->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0
11654 || elf_section_data (o)->this_hdr.sh_type == SHT_NOTE)
11656 /* Keep debug, special and SHT_NOTE sections. */
11663 /* Skip sweeping sections already excluded. */
11664 if (o->flags & SEC_EXCLUDE)
11667 /* Since this is early in the link process, it is simple
11668 to remove a section from the output. */
11669 o->flags |= SEC_EXCLUDE;
11671 if (info->print_gc_sections && o->size != 0)
11672 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
11674 /* But we also have to update some of the relocation
11675 info we collected before. */
11677 && (o->flags & SEC_RELOC) != 0
11678 && o->reloc_count > 0
11679 && !bfd_is_abs_section (o->output_section))
11681 Elf_Internal_Rela *internal_relocs;
11685 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
11686 info->keep_memory);
11687 if (internal_relocs == NULL)
11690 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
11692 if (elf_section_data (o)->relocs != internal_relocs)
11693 free (internal_relocs);
11701 /* Remove the symbols that were in the swept sections from the dynamic
11702 symbol table. GCFIXME: Anyone know how to get them out of the
11703 static symbol table as well? */
11704 sweep_info.info = info;
11705 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
11706 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
11709 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
11713 /* Propagate collected vtable information. This is called through
11714 elf_link_hash_traverse. */
11717 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
11719 if (h->root.type == bfd_link_hash_warning)
11720 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11722 /* Those that are not vtables. */
11723 if (h->vtable == NULL || h->vtable->parent == NULL)
11726 /* Those vtables that do not have parents, we cannot merge. */
11727 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
11730 /* If we've already been done, exit. */
11731 if (h->vtable->used && h->vtable->used[-1])
11734 /* Make sure the parent's table is up to date. */
11735 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
11737 if (h->vtable->used == NULL)
11739 /* None of this table's entries were referenced. Re-use the
11741 h->vtable->used = h->vtable->parent->vtable->used;
11742 h->vtable->size = h->vtable->parent->vtable->size;
11747 bfd_boolean *cu, *pu;
11749 /* Or the parent's entries into ours. */
11750 cu = h->vtable->used;
11752 pu = h->vtable->parent->vtable->used;
11755 const struct elf_backend_data *bed;
11756 unsigned int log_file_align;
11758 bed = get_elf_backend_data (h->root.u.def.section->owner);
11759 log_file_align = bed->s->log_file_align;
11760 n = h->vtable->parent->vtable->size >> log_file_align;
11775 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
11778 bfd_vma hstart, hend;
11779 Elf_Internal_Rela *relstart, *relend, *rel;
11780 const struct elf_backend_data *bed;
11781 unsigned int log_file_align;
11783 if (h->root.type == bfd_link_hash_warning)
11784 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11786 /* Take care of both those symbols that do not describe vtables as
11787 well as those that are not loaded. */
11788 if (h->vtable == NULL || h->vtable->parent == NULL)
11791 BFD_ASSERT (h->root.type == bfd_link_hash_defined
11792 || h->root.type == bfd_link_hash_defweak);
11794 sec = h->root.u.def.section;
11795 hstart = h->root.u.def.value;
11796 hend = hstart + h->size;
11798 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
11800 return *(bfd_boolean *) okp = FALSE;
11801 bed = get_elf_backend_data (sec->owner);
11802 log_file_align = bed->s->log_file_align;
11804 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
11806 for (rel = relstart; rel < relend; ++rel)
11807 if (rel->r_offset >= hstart && rel->r_offset < hend)
11809 /* If the entry is in use, do nothing. */
11810 if (h->vtable->used
11811 && (rel->r_offset - hstart) < h->vtable->size)
11813 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
11814 if (h->vtable->used[entry])
11817 /* Otherwise, kill it. */
11818 rel->r_offset = rel->r_info = rel->r_addend = 0;
11824 /* Mark sections containing dynamically referenced symbols. When
11825 building shared libraries, we must assume that any visible symbol is
11829 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
11831 struct bfd_link_info *info = (struct bfd_link_info *) inf;
11833 if (h->root.type == bfd_link_hash_warning)
11834 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11836 if ((h->root.type == bfd_link_hash_defined
11837 || h->root.type == bfd_link_hash_defweak)
11839 || (!info->executable
11841 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
11842 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN)))
11843 h->root.u.def.section->flags |= SEC_KEEP;
11848 /* Keep all sections containing symbols undefined on the command-line,
11849 and the section containing the entry symbol. */
11852 _bfd_elf_gc_keep (struct bfd_link_info *info)
11854 struct bfd_sym_chain *sym;
11856 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
11858 struct elf_link_hash_entry *h;
11860 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
11861 FALSE, FALSE, FALSE);
11864 && (h->root.type == bfd_link_hash_defined
11865 || h->root.type == bfd_link_hash_defweak)
11866 && !bfd_is_abs_section (h->root.u.def.section))
11867 h->root.u.def.section->flags |= SEC_KEEP;
11871 /* Do mark and sweep of unused sections. */
11874 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
11876 bfd_boolean ok = TRUE;
11878 elf_gc_mark_hook_fn gc_mark_hook;
11879 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11881 if (!bed->can_gc_sections
11882 || !is_elf_hash_table (info->hash))
11884 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
11888 bed->gc_keep (info);
11890 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11891 at the .eh_frame section if we can mark the FDEs individually. */
11892 _bfd_elf_begin_eh_frame_parsing (info);
11893 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11896 struct elf_reloc_cookie cookie;
11898 sec = bfd_get_section_by_name (sub, ".eh_frame");
11899 if (sec && init_reloc_cookie_for_section (&cookie, info, sec))
11901 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
11902 if (elf_section_data (sec)->sec_info)
11903 elf_eh_frame_section (sub) = sec;
11904 fini_reloc_cookie_for_section (&cookie, sec);
11907 _bfd_elf_end_eh_frame_parsing (info);
11909 /* Apply transitive closure to the vtable entry usage info. */
11910 elf_link_hash_traverse (elf_hash_table (info),
11911 elf_gc_propagate_vtable_entries_used,
11916 /* Kill the vtable relocations that were not used. */
11917 elf_link_hash_traverse (elf_hash_table (info),
11918 elf_gc_smash_unused_vtentry_relocs,
11923 /* Mark dynamically referenced symbols. */
11924 if (elf_hash_table (info)->dynamic_sections_created)
11925 elf_link_hash_traverse (elf_hash_table (info),
11926 bed->gc_mark_dynamic_ref,
11929 /* Grovel through relocs to find out who stays ... */
11930 gc_mark_hook = bed->gc_mark_hook;
11931 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11935 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11938 for (o = sub->sections; o != NULL; o = o->next)
11939 if ((o->flags & (SEC_EXCLUDE | SEC_KEEP)) == SEC_KEEP && !o->gc_mark)
11940 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
11944 /* Allow the backend to mark additional target specific sections. */
11945 if (bed->gc_mark_extra_sections)
11946 bed->gc_mark_extra_sections (info, gc_mark_hook);
11948 /* ... and mark SEC_EXCLUDE for those that go. */
11949 return elf_gc_sweep (abfd, info);
11952 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
11955 bfd_elf_gc_record_vtinherit (bfd *abfd,
11957 struct elf_link_hash_entry *h,
11960 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
11961 struct elf_link_hash_entry **search, *child;
11962 bfd_size_type extsymcount;
11963 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11965 /* The sh_info field of the symtab header tells us where the
11966 external symbols start. We don't care about the local symbols at
11968 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
11969 if (!elf_bad_symtab (abfd))
11970 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
11972 sym_hashes = elf_sym_hashes (abfd);
11973 sym_hashes_end = sym_hashes + extsymcount;
11975 /* Hunt down the child symbol, which is in this section at the same
11976 offset as the relocation. */
11977 for (search = sym_hashes; search != sym_hashes_end; ++search)
11979 if ((child = *search) != NULL
11980 && (child->root.type == bfd_link_hash_defined
11981 || child->root.type == bfd_link_hash_defweak)
11982 && child->root.u.def.section == sec
11983 && child->root.u.def.value == offset)
11987 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
11988 abfd, sec, (unsigned long) offset);
11989 bfd_set_error (bfd_error_invalid_operation);
11993 if (!child->vtable)
11995 child->vtable = (struct elf_link_virtual_table_entry *)
11996 bfd_zalloc (abfd, sizeof (*child->vtable));
11997 if (!child->vtable)
12002 /* This *should* only be the absolute section. It could potentially
12003 be that someone has defined a non-global vtable though, which
12004 would be bad. It isn't worth paging in the local symbols to be
12005 sure though; that case should simply be handled by the assembler. */
12007 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12010 child->vtable->parent = h;
12015 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12018 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12019 asection *sec ATTRIBUTE_UNUSED,
12020 struct elf_link_hash_entry *h,
12023 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12024 unsigned int log_file_align = bed->s->log_file_align;
12028 h->vtable = (struct elf_link_virtual_table_entry *)
12029 bfd_zalloc (abfd, sizeof (*h->vtable));
12034 if (addend >= h->vtable->size)
12036 size_t size, bytes, file_align;
12037 bfd_boolean *ptr = h->vtable->used;
12039 /* While the symbol is undefined, we have to be prepared to handle
12041 file_align = 1 << log_file_align;
12042 if (h->root.type == bfd_link_hash_undefined)
12043 size = addend + file_align;
12047 if (addend >= size)
12049 /* Oops! We've got a reference past the defined end of
12050 the table. This is probably a bug -- shall we warn? */
12051 size = addend + file_align;
12054 size = (size + file_align - 1) & -file_align;
12056 /* Allocate one extra entry for use as a "done" flag for the
12057 consolidation pass. */
12058 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12062 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12068 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12069 * sizeof (bfd_boolean));
12070 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12074 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12079 /* And arrange for that done flag to be at index -1. */
12080 h->vtable->used = ptr + 1;
12081 h->vtable->size = size;
12084 h->vtable->used[addend >> log_file_align] = TRUE;
12089 struct alloc_got_off_arg {
12091 struct bfd_link_info *info;
12094 /* We need a special top-level link routine to convert got reference counts
12095 to real got offsets. */
12098 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12100 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12101 bfd *obfd = gofarg->info->output_bfd;
12102 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12104 if (h->root.type == bfd_link_hash_warning)
12105 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12107 if (h->got.refcount > 0)
12109 h->got.offset = gofarg->gotoff;
12110 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12113 h->got.offset = (bfd_vma) -1;
12118 /* And an accompanying bit to work out final got entry offsets once
12119 we're done. Should be called from final_link. */
12122 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12123 struct bfd_link_info *info)
12126 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12128 struct alloc_got_off_arg gofarg;
12130 BFD_ASSERT (abfd == info->output_bfd);
12132 if (! is_elf_hash_table (info->hash))
12135 /* The GOT offset is relative to the .got section, but the GOT header is
12136 put into the .got.plt section, if the backend uses it. */
12137 if (bed->want_got_plt)
12140 gotoff = bed->got_header_size;
12142 /* Do the local .got entries first. */
12143 for (i = info->input_bfds; i; i = i->link_next)
12145 bfd_signed_vma *local_got;
12146 bfd_size_type j, locsymcount;
12147 Elf_Internal_Shdr *symtab_hdr;
12149 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12152 local_got = elf_local_got_refcounts (i);
12156 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12157 if (elf_bad_symtab (i))
12158 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12160 locsymcount = symtab_hdr->sh_info;
12162 for (j = 0; j < locsymcount; ++j)
12164 if (local_got[j] > 0)
12166 local_got[j] = gotoff;
12167 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12170 local_got[j] = (bfd_vma) -1;
12174 /* Then the global .got entries. .plt refcounts are handled by
12175 adjust_dynamic_symbol */
12176 gofarg.gotoff = gotoff;
12177 gofarg.info = info;
12178 elf_link_hash_traverse (elf_hash_table (info),
12179 elf_gc_allocate_got_offsets,
12184 /* Many folk need no more in the way of final link than this, once
12185 got entry reference counting is enabled. */
12188 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12190 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12193 /* Invoke the regular ELF backend linker to do all the work. */
12194 return bfd_elf_final_link (abfd, info);
12198 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12200 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12202 if (rcookie->bad_symtab)
12203 rcookie->rel = rcookie->rels;
12205 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12207 unsigned long r_symndx;
12209 if (! rcookie->bad_symtab)
12210 if (rcookie->rel->r_offset > offset)
12212 if (rcookie->rel->r_offset != offset)
12215 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12216 if (r_symndx == STN_UNDEF)
12219 if (r_symndx >= rcookie->locsymcount
12220 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12222 struct elf_link_hash_entry *h;
12224 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12226 while (h->root.type == bfd_link_hash_indirect
12227 || h->root.type == bfd_link_hash_warning)
12228 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12230 if ((h->root.type == bfd_link_hash_defined
12231 || h->root.type == bfd_link_hash_defweak)
12232 && elf_discarded_section (h->root.u.def.section))
12239 /* It's not a relocation against a global symbol,
12240 but it could be a relocation against a local
12241 symbol for a discarded section. */
12243 Elf_Internal_Sym *isym;
12245 /* Need to: get the symbol; get the section. */
12246 isym = &rcookie->locsyms[r_symndx];
12247 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12248 if (isec != NULL && elf_discarded_section (isec))
12256 /* Discard unneeded references to discarded sections.
12257 Returns TRUE if any section's size was changed. */
12258 /* This function assumes that the relocations are in sorted order,
12259 which is true for all known assemblers. */
12262 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12264 struct elf_reloc_cookie cookie;
12265 asection *stab, *eh;
12266 const struct elf_backend_data *bed;
12268 bfd_boolean ret = FALSE;
12270 if (info->traditional_format
12271 || !is_elf_hash_table (info->hash))
12274 _bfd_elf_begin_eh_frame_parsing (info);
12275 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
12277 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12280 bed = get_elf_backend_data (abfd);
12282 if ((abfd->flags & DYNAMIC) != 0)
12286 if (!info->relocatable)
12288 eh = bfd_get_section_by_name (abfd, ".eh_frame");
12291 || bfd_is_abs_section (eh->output_section)))
12295 stab = bfd_get_section_by_name (abfd, ".stab");
12297 && (stab->size == 0
12298 || bfd_is_abs_section (stab->output_section)
12299 || stab->sec_info_type != ELF_INFO_TYPE_STABS))
12304 && bed->elf_backend_discard_info == NULL)
12307 if (!init_reloc_cookie (&cookie, info, abfd))
12311 && stab->reloc_count > 0
12312 && init_reloc_cookie_rels (&cookie, info, abfd, stab))
12314 if (_bfd_discard_section_stabs (abfd, stab,
12315 elf_section_data (stab)->sec_info,
12316 bfd_elf_reloc_symbol_deleted_p,
12319 fini_reloc_cookie_rels (&cookie, stab);
12323 && init_reloc_cookie_rels (&cookie, info, abfd, eh))
12325 _bfd_elf_parse_eh_frame (abfd, info, eh, &cookie);
12326 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
12327 bfd_elf_reloc_symbol_deleted_p,
12330 fini_reloc_cookie_rels (&cookie, eh);
12333 if (bed->elf_backend_discard_info != NULL
12334 && (*bed->elf_backend_discard_info) (abfd, &cookie, info))
12337 fini_reloc_cookie (&cookie, abfd);
12339 _bfd_elf_end_eh_frame_parsing (info);
12341 if (info->eh_frame_hdr
12342 && !info->relocatable
12343 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12349 /* For a SHT_GROUP section, return the group signature. For other
12350 sections, return the normal section name. */
12352 static const char *
12353 section_signature (asection *sec)
12355 if ((sec->flags & SEC_GROUP) != 0
12356 && elf_next_in_group (sec) != NULL
12357 && elf_group_name (elf_next_in_group (sec)) != NULL)
12358 return elf_group_name (elf_next_in_group (sec));
12363 _bfd_elf_section_already_linked (bfd *abfd, asection *sec,
12364 struct bfd_link_info *info)
12367 const char *name, *p;
12368 struct bfd_section_already_linked *l;
12369 struct bfd_section_already_linked_hash_entry *already_linked_list;
12371 if (sec->output_section == bfd_abs_section_ptr)
12374 flags = sec->flags;
12376 /* Return if it isn't a linkonce section. A comdat group section
12377 also has SEC_LINK_ONCE set. */
12378 if ((flags & SEC_LINK_ONCE) == 0)
12381 /* Don't put group member sections on our list of already linked
12382 sections. They are handled as a group via their group section. */
12383 if (elf_sec_group (sec) != NULL)
12386 /* FIXME: When doing a relocatable link, we may have trouble
12387 copying relocations in other sections that refer to local symbols
12388 in the section being discarded. Those relocations will have to
12389 be converted somehow; as of this writing I'm not sure that any of
12390 the backends handle that correctly.
12392 It is tempting to instead not discard link once sections when
12393 doing a relocatable link (technically, they should be discarded
12394 whenever we are building constructors). However, that fails,
12395 because the linker winds up combining all the link once sections
12396 into a single large link once section, which defeats the purpose
12397 of having link once sections in the first place.
12399 Also, not merging link once sections in a relocatable link
12400 causes trouble for MIPS ELF, which relies on link once semantics
12401 to handle the .reginfo section correctly. */
12403 name = section_signature (sec);
12405 if (CONST_STRNEQ (name, ".gnu.linkonce.")
12406 && (p = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
12411 already_linked_list = bfd_section_already_linked_table_lookup (p);
12413 for (l = already_linked_list->entry; l != NULL; l = l->next)
12415 /* We may have 2 different types of sections on the list: group
12416 sections and linkonce sections. Match like sections. */
12417 if ((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
12418 && strcmp (name, section_signature (l->sec)) == 0
12419 && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL)
12421 /* The section has already been linked. See if we should
12422 issue a warning. */
12423 switch (flags & SEC_LINK_DUPLICATES)
12428 case SEC_LINK_DUPLICATES_DISCARD:
12431 case SEC_LINK_DUPLICATES_ONE_ONLY:
12432 (*_bfd_error_handler)
12433 (_("%B: ignoring duplicate section `%A'"),
12437 case SEC_LINK_DUPLICATES_SAME_SIZE:
12438 if (sec->size != l->sec->size)
12439 (*_bfd_error_handler)
12440 (_("%B: duplicate section `%A' has different size"),
12444 case SEC_LINK_DUPLICATES_SAME_CONTENTS:
12445 if (sec->size != l->sec->size)
12446 (*_bfd_error_handler)
12447 (_("%B: duplicate section `%A' has different size"),
12449 else if (sec->size != 0)
12451 bfd_byte *sec_contents, *l_sec_contents;
12453 if (!bfd_malloc_and_get_section (abfd, sec, &sec_contents))
12454 (*_bfd_error_handler)
12455 (_("%B: warning: could not read contents of section `%A'"),
12457 else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec,
12459 (*_bfd_error_handler)
12460 (_("%B: warning: could not read contents of section `%A'"),
12461 l->sec->owner, l->sec);
12462 else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0)
12463 (*_bfd_error_handler)
12464 (_("%B: warning: duplicate section `%A' has different contents"),
12468 free (sec_contents);
12469 if (l_sec_contents)
12470 free (l_sec_contents);
12475 /* Set the output_section field so that lang_add_section
12476 does not create a lang_input_section structure for this
12477 section. Since there might be a symbol in the section
12478 being discarded, we must retain a pointer to the section
12479 which we are really going to use. */
12480 sec->output_section = bfd_abs_section_ptr;
12481 sec->kept_section = l->sec;
12483 if (flags & SEC_GROUP)
12485 asection *first = elf_next_in_group (sec);
12486 asection *s = first;
12490 s->output_section = bfd_abs_section_ptr;
12491 /* Record which group discards it. */
12492 s->kept_section = l->sec;
12493 s = elf_next_in_group (s);
12494 /* These lists are circular. */
12504 /* A single member comdat group section may be discarded by a
12505 linkonce section and vice versa. */
12507 if ((flags & SEC_GROUP) != 0)
12509 asection *first = elf_next_in_group (sec);
12511 if (first != NULL && elf_next_in_group (first) == first)
12512 /* Check this single member group against linkonce sections. */
12513 for (l = already_linked_list->entry; l != NULL; l = l->next)
12514 if ((l->sec->flags & SEC_GROUP) == 0
12515 && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL
12516 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
12518 first->output_section = bfd_abs_section_ptr;
12519 first->kept_section = l->sec;
12520 sec->output_section = bfd_abs_section_ptr;
12525 /* Check this linkonce section against single member groups. */
12526 for (l = already_linked_list->entry; l != NULL; l = l->next)
12527 if (l->sec->flags & SEC_GROUP)
12529 asection *first = elf_next_in_group (l->sec);
12532 && elf_next_in_group (first) == first
12533 && bfd_elf_match_symbols_in_sections (first, sec, info))
12535 sec->output_section = bfd_abs_section_ptr;
12536 sec->kept_section = first;
12541 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12542 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12543 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12544 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12545 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12546 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12547 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12548 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12549 The reverse order cannot happen as there is never a bfd with only the
12550 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12551 matter as here were are looking only for cross-bfd sections. */
12553 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
12554 for (l = already_linked_list->entry; l != NULL; l = l->next)
12555 if ((l->sec->flags & SEC_GROUP) == 0
12556 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
12558 if (abfd != l->sec->owner)
12559 sec->output_section = bfd_abs_section_ptr;
12563 /* This is the first section with this name. Record it. */
12564 if (! bfd_section_already_linked_table_insert (already_linked_list, sec))
12565 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
12569 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
12571 return sym->st_shndx == SHN_COMMON;
12575 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
12581 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
12583 return bfd_com_section_ptr;
12587 _bfd_elf_default_got_elt_size (bfd *abfd,
12588 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12589 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
12590 bfd *ibfd ATTRIBUTE_UNUSED,
12591 unsigned long symndx ATTRIBUTE_UNUSED)
12593 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12594 return bed->s->arch_size / 8;
12597 /* Routines to support the creation of dynamic relocs. */
12599 /* Return true if NAME is a name of a relocation
12600 section associated with section S. */
12603 is_reloc_section (bfd_boolean rela, const char * name, asection * s)
12606 return CONST_STRNEQ (name, ".rela")
12607 && strcmp (bfd_get_section_name (NULL, s), name + 5) == 0;
12609 return CONST_STRNEQ (name, ".rel")
12610 && strcmp (bfd_get_section_name (NULL, s), name + 4) == 0;
12613 /* Returns the name of the dynamic reloc section associated with SEC. */
12615 static const char *
12616 get_dynamic_reloc_section_name (bfd * abfd,
12618 bfd_boolean is_rela)
12621 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
12622 unsigned int shnam = _bfd_elf_single_rel_hdr (sec)->sh_name;
12624 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
12628 if (! is_reloc_section (is_rela, name, sec))
12630 static bfd_boolean complained = FALSE;
12634 (*_bfd_error_handler)
12635 (_("%B: bad relocation section name `%s\'"), abfd, name);
12644 /* Returns the dynamic reloc section associated with SEC.
12645 If necessary compute the name of the dynamic reloc section based
12646 on SEC's name (looked up in ABFD's string table) and the setting
12650 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
12652 bfd_boolean is_rela)
12654 asection * reloc_sec = elf_section_data (sec)->sreloc;
12656 if (reloc_sec == NULL)
12658 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12662 reloc_sec = bfd_get_section_by_name (abfd, name);
12664 if (reloc_sec != NULL)
12665 elf_section_data (sec)->sreloc = reloc_sec;
12672 /* Returns the dynamic reloc section associated with SEC. If the
12673 section does not exist it is created and attached to the DYNOBJ
12674 bfd and stored in the SRELOC field of SEC's elf_section_data
12677 ALIGNMENT is the alignment for the newly created section and
12678 IS_RELA defines whether the name should be .rela.<SEC's name>
12679 or .rel.<SEC's name>. The section name is looked up in the
12680 string table associated with ABFD. */
12683 _bfd_elf_make_dynamic_reloc_section (asection * sec,
12685 unsigned int alignment,
12687 bfd_boolean is_rela)
12689 asection * reloc_sec = elf_section_data (sec)->sreloc;
12691 if (reloc_sec == NULL)
12693 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12698 reloc_sec = bfd_get_section_by_name (dynobj, name);
12700 if (reloc_sec == NULL)
12704 flags = (SEC_HAS_CONTENTS | SEC_READONLY | SEC_IN_MEMORY | SEC_LINKER_CREATED);
12705 if ((sec->flags & SEC_ALLOC) != 0)
12706 flags |= SEC_ALLOC | SEC_LOAD;
12708 reloc_sec = bfd_make_section_with_flags (dynobj, name, flags);
12709 if (reloc_sec != NULL)
12711 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
12716 elf_section_data (sec)->sreloc = reloc_sec;
12722 /* Copy the ELF symbol type associated with a linker hash entry. */
12724 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd ATTRIBUTE_UNUSED,
12725 struct bfd_link_hash_entry * hdest,
12726 struct bfd_link_hash_entry * hsrc)
12728 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *)hdest;
12729 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *)hsrc;
12731 ehdest->type = ehsrc->type;