2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* $FreeBSD: src/contrib/binutils/bfd/elflink.h,v 1.2.6.5 2002/09/01 23:43:38 obrien Exp $ */
23 /* ELF linker code. */
25 /* This struct is used to pass information to routines called via
26 elf_link_hash_traverse which must return failure. */
28 struct elf_info_failed
31 struct bfd_link_info *info;
32 struct bfd_elf_version_tree *verdefs;
35 static boolean is_global_data_symbol_definition
36 PARAMS ((bfd *, Elf_Internal_Sym *));
37 static boolean elf_link_is_defined_archive_symbol
38 PARAMS ((bfd *, carsym *));
39 static boolean elf_link_add_object_symbols
40 PARAMS ((bfd *, struct bfd_link_info *));
41 static boolean elf_link_add_archive_symbols
42 PARAMS ((bfd *, struct bfd_link_info *));
43 static boolean elf_merge_symbol
44 PARAMS ((bfd *, struct bfd_link_info *, const char *,
45 Elf_Internal_Sym *, asection **, bfd_vma *,
46 struct elf_link_hash_entry **, boolean *, boolean *,
48 static boolean elf_add_default_symbol
49 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
50 const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
51 boolean *, boolean, boolean));
52 static boolean elf_export_symbol
53 PARAMS ((struct elf_link_hash_entry *, PTR));
54 static boolean elf_finalize_dynstr
55 PARAMS ((bfd *, struct bfd_link_info *));
56 static boolean elf_fix_symbol_flags
57 PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *));
58 static boolean elf_adjust_dynamic_symbol
59 PARAMS ((struct elf_link_hash_entry *, PTR));
60 static boolean elf_link_find_version_dependencies
61 PARAMS ((struct elf_link_hash_entry *, PTR));
62 static boolean elf_link_assign_sym_version
63 PARAMS ((struct elf_link_hash_entry *, PTR));
64 static boolean elf_collect_hash_codes
65 PARAMS ((struct elf_link_hash_entry *, PTR));
66 static boolean elf_link_read_relocs_from_section
67 PARAMS ((bfd *, Elf_Internal_Shdr *, PTR, Elf_Internal_Rela *));
68 static size_t compute_bucket_count
69 PARAMS ((struct bfd_link_info *));
70 static void elf_link_output_relocs
71 PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *));
72 static boolean elf_link_size_reloc_section
73 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
74 static void elf_link_adjust_relocs
75 PARAMS ((bfd *, Elf_Internal_Shdr *, unsigned int,
76 struct elf_link_hash_entry **));
77 static int elf_link_sort_cmp1
78 PARAMS ((const void *, const void *));
79 static int elf_link_sort_cmp2
80 PARAMS ((const void *, const void *));
81 static size_t elf_link_sort_relocs
82 PARAMS ((bfd *, struct bfd_link_info *, asection **));
83 static boolean elf_section_ignore_discarded_relocs
84 PARAMS ((asection *));
86 /* Given an ELF BFD, add symbols to the global hash table as
90 elf_bfd_link_add_symbols (abfd, info)
92 struct bfd_link_info *info;
94 switch (bfd_get_format (abfd))
97 return elf_link_add_object_symbols (abfd, info);
99 return elf_link_add_archive_symbols (abfd, info);
101 bfd_set_error (bfd_error_wrong_format);
106 /* Return true iff this is a non-common, definition of a non-function symbol. */
108 is_global_data_symbol_definition (abfd, sym)
109 bfd * abfd ATTRIBUTE_UNUSED;
110 Elf_Internal_Sym * sym;
112 /* Local symbols do not count, but target specific ones might. */
113 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
114 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
117 /* Function symbols do not count. */
118 if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
121 /* If the section is undefined, then so is the symbol. */
122 if (sym->st_shndx == SHN_UNDEF)
125 /* If the symbol is defined in the common section, then
126 it is a common definition and so does not count. */
127 if (sym->st_shndx == SHN_COMMON)
130 /* If the symbol is in a target specific section then we
131 must rely upon the backend to tell us what it is. */
132 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
133 /* FIXME - this function is not coded yet:
135 return _bfd_is_global_symbol_definition (abfd, sym);
137 Instead for now assume that the definition is not global,
138 Even if this is wrong, at least the linker will behave
139 in the same way that it used to do. */
145 /* Search the symbol table of the archive element of the archive ABFD
146 whose archive map contains a mention of SYMDEF, and determine if
147 the symbol is defined in this element. */
149 elf_link_is_defined_archive_symbol (abfd, symdef)
153 Elf_Internal_Shdr * hdr;
154 Elf_Internal_Shdr * shndx_hdr;
155 Elf_External_Sym * esym;
156 Elf_External_Sym * esymend;
157 Elf_External_Sym * buf = NULL;
158 Elf_External_Sym_Shndx * shndx_buf = NULL;
159 Elf_External_Sym_Shndx * shndx;
160 bfd_size_type symcount;
161 bfd_size_type extsymcount;
162 bfd_size_type extsymoff;
163 boolean result = false;
167 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
168 if (abfd == (bfd *) NULL)
171 if (! bfd_check_format (abfd, bfd_object))
174 /* If we have already included the element containing this symbol in the
175 link then we do not need to include it again. Just claim that any symbol
176 it contains is not a definition, so that our caller will not decide to
177 (re)include this element. */
178 if (abfd->archive_pass)
181 /* Select the appropriate symbol table. */
182 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
184 hdr = &elf_tdata (abfd)->symtab_hdr;
185 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
189 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
193 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
195 /* The sh_info field of the symtab header tells us where the
196 external symbols start. We don't care about the local symbols. */
197 if (elf_bad_symtab (abfd))
199 extsymcount = symcount;
204 extsymcount = symcount - hdr->sh_info;
205 extsymoff = hdr->sh_info;
208 amt = extsymcount * sizeof (Elf_External_Sym);
209 buf = (Elf_External_Sym *) bfd_malloc (amt);
210 if (buf == NULL && extsymcount != 0)
213 /* Read in the symbol table.
214 FIXME: This ought to be cached somewhere. */
215 pos = hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym);
216 if (bfd_seek (abfd, pos, SEEK_SET) != 0
217 || bfd_bread ((PTR) buf, amt, abfd) != amt)
220 if (shndx_hdr != NULL && shndx_hdr->sh_size != 0)
222 amt = extsymcount * sizeof (Elf_External_Sym_Shndx);
223 shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
224 if (shndx_buf == NULL && extsymcount != 0)
227 pos = shndx_hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym_Shndx);
228 if (bfd_seek (abfd, pos, SEEK_SET) != 0
229 || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
233 /* Scan the symbol table looking for SYMDEF. */
234 esymend = buf + extsymcount;
235 for (esym = buf, shndx = shndx_buf;
237 esym++, shndx = (shndx != NULL ? shndx + 1 : NULL))
239 Elf_Internal_Sym sym;
242 elf_swap_symbol_in (abfd, esym, shndx, &sym);
244 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
245 if (name == (const char *) NULL)
248 if (strcmp (name, symdef->name) == 0)
250 result = is_global_data_symbol_definition (abfd, & sym);
256 if (shndx_buf != NULL)
264 /* Add symbols from an ELF archive file to the linker hash table. We
265 don't use _bfd_generic_link_add_archive_symbols because of a
266 problem which arises on UnixWare. The UnixWare libc.so is an
267 archive which includes an entry libc.so.1 which defines a bunch of
268 symbols. The libc.so archive also includes a number of other
269 object files, which also define symbols, some of which are the same
270 as those defined in libc.so.1. Correct linking requires that we
271 consider each object file in turn, and include it if it defines any
272 symbols we need. _bfd_generic_link_add_archive_symbols does not do
273 this; it looks through the list of undefined symbols, and includes
274 any object file which defines them. When this algorithm is used on
275 UnixWare, it winds up pulling in libc.so.1 early and defining a
276 bunch of symbols. This means that some of the other objects in the
277 archive are not included in the link, which is incorrect since they
278 precede libc.so.1 in the archive.
280 Fortunately, ELF archive handling is simpler than that done by
281 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
282 oddities. In ELF, if we find a symbol in the archive map, and the
283 symbol is currently undefined, we know that we must pull in that
286 Unfortunately, we do have to make multiple passes over the symbol
287 table until nothing further is resolved. */
290 elf_link_add_archive_symbols (abfd, info)
292 struct bfd_link_info *info;
295 boolean *defined = NULL;
296 boolean *included = NULL;
301 if (! bfd_has_map (abfd))
303 /* An empty archive is a special case. */
304 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
306 bfd_set_error (bfd_error_no_armap);
310 /* Keep track of all symbols we know to be already defined, and all
311 files we know to be already included. This is to speed up the
312 second and subsequent passes. */
313 c = bfd_ardata (abfd)->symdef_count;
317 amt *= sizeof (boolean);
318 defined = (boolean *) bfd_malloc (amt);
319 included = (boolean *) bfd_malloc (amt);
320 if (defined == (boolean *) NULL || included == (boolean *) NULL)
322 memset (defined, 0, (size_t) amt);
323 memset (included, 0, (size_t) amt);
325 symdefs = bfd_ardata (abfd)->symdefs;
338 symdefend = symdef + c;
339 for (i = 0; symdef < symdefend; symdef++, i++)
341 struct elf_link_hash_entry *h;
343 struct bfd_link_hash_entry *undefs_tail;
346 if (defined[i] || included[i])
348 if (symdef->file_offset == last)
354 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
355 false, false, false);
361 /* If this is a default version (the name contains @@),
362 look up the symbol again without the version. The
363 effect is that references to the symbol without the
364 version will be matched by the default symbol in the
367 p = strchr (symdef->name, ELF_VER_CHR);
368 if (p == NULL || p[1] != ELF_VER_CHR)
371 copy = bfd_alloc (abfd, (bfd_size_type) (p - symdef->name + 1));
374 memcpy (copy, symdef->name, (size_t) (p - symdef->name));
375 copy[p - symdef->name] = '\0';
377 h = elf_link_hash_lookup (elf_hash_table (info), copy,
378 false, false, false);
380 bfd_release (abfd, copy);
386 if (h->root.type == bfd_link_hash_common)
388 /* We currently have a common symbol. The archive map contains
389 a reference to this symbol, so we may want to include it. We
390 only want to include it however, if this archive element
391 contains a definition of the symbol, not just another common
394 Unfortunately some archivers (including GNU ar) will put
395 declarations of common symbols into their archive maps, as
396 well as real definitions, so we cannot just go by the archive
397 map alone. Instead we must read in the element's symbol
398 table and check that to see what kind of symbol definition
400 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
403 else if (h->root.type != bfd_link_hash_undefined)
405 if (h->root.type != bfd_link_hash_undefweak)
410 /* We need to include this archive member. */
411 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
412 if (element == (bfd *) NULL)
415 if (! bfd_check_format (element, bfd_object))
418 /* Doublecheck that we have not included this object
419 already--it should be impossible, but there may be
420 something wrong with the archive. */
421 if (element->archive_pass != 0)
423 bfd_set_error (bfd_error_bad_value);
426 element->archive_pass = 1;
428 undefs_tail = info->hash->undefs_tail;
430 if (! (*info->callbacks->add_archive_element) (info, element,
433 if (! elf_link_add_object_symbols (element, info))
436 /* If there are any new undefined symbols, we need to make
437 another pass through the archive in order to see whether
438 they can be defined. FIXME: This isn't perfect, because
439 common symbols wind up on undefs_tail and because an
440 undefined symbol which is defined later on in this pass
441 does not require another pass. This isn't a bug, but it
442 does make the code less efficient than it could be. */
443 if (undefs_tail != info->hash->undefs_tail)
446 /* Look backward to mark all symbols from this object file
447 which we have already seen in this pass. */
451 included[mark] = true;
456 while (symdefs[mark].file_offset == symdef->file_offset);
458 /* We mark subsequent symbols from this object file as we go
459 on through the loop. */
460 last = symdef->file_offset;
471 if (defined != (boolean *) NULL)
473 if (included != (boolean *) NULL)
478 /* This function is called when we want to define a new symbol. It
479 handles the various cases which arise when we find a definition in
480 a dynamic object, or when there is already a definition in a
481 dynamic object. The new symbol is described by NAME, SYM, PSEC,
482 and PVALUE. We set SYM_HASH to the hash table entry. We set
483 OVERRIDE if the old symbol is overriding a new definition. We set
484 TYPE_CHANGE_OK if it is OK for the type to change. We set
485 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
486 change, we mean that we shouldn't warn if the type or size does
487 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
491 elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash,
492 override, type_change_ok, size_change_ok, dt_needed)
494 struct bfd_link_info *info;
496 Elf_Internal_Sym *sym;
499 struct elf_link_hash_entry **sym_hash;
501 boolean *type_change_ok;
502 boolean *size_change_ok;
506 struct elf_link_hash_entry *h;
509 boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
514 bind = ELF_ST_BIND (sym->st_info);
516 if (! bfd_is_und_section (sec))
517 h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false);
519 h = ((struct elf_link_hash_entry *)
520 bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false));
525 /* This code is for coping with dynamic objects, and is only useful
526 if we are doing an ELF link. */
527 if (info->hash->creator != abfd->xvec)
530 /* For merging, we only care about real symbols. */
532 while (h->root.type == bfd_link_hash_indirect
533 || h->root.type == bfd_link_hash_warning)
534 h = (struct elf_link_hash_entry *) h->root.u.i.link;
536 /* If we just created the symbol, mark it as being an ELF symbol.
537 Other than that, there is nothing to do--there is no merge issue
538 with a newly defined symbol--so we just return. */
540 if (h->root.type == bfd_link_hash_new)
542 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
546 /* OLDBFD is a BFD associated with the existing symbol. */
548 switch (h->root.type)
554 case bfd_link_hash_undefined:
555 case bfd_link_hash_undefweak:
556 oldbfd = h->root.u.undef.abfd;
559 case bfd_link_hash_defined:
560 case bfd_link_hash_defweak:
561 oldbfd = h->root.u.def.section->owner;
564 case bfd_link_hash_common:
565 oldbfd = h->root.u.c.p->section->owner;
569 /* In cases involving weak versioned symbols, we may wind up trying
570 to merge a symbol with itself. Catch that here, to avoid the
571 confusion that results if we try to override a symbol with
572 itself. The additional tests catch cases like
573 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
574 dynamic object, which we do want to handle here. */
576 && ((abfd->flags & DYNAMIC) == 0
577 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))
580 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
581 respectively, is from a dynamic object. */
583 if ((abfd->flags & DYNAMIC) != 0)
589 olddyn = (oldbfd->flags & DYNAMIC) != 0;
594 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
595 indices used by MIPS ELF. */
596 switch (h->root.type)
602 case bfd_link_hash_defined:
603 case bfd_link_hash_defweak:
604 hsec = h->root.u.def.section;
607 case bfd_link_hash_common:
608 hsec = h->root.u.c.p->section;
615 olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0;
618 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
619 respectively, appear to be a definition rather than reference. */
621 if (bfd_is_und_section (sec) || bfd_is_com_section (sec))
626 if (h->root.type == bfd_link_hash_undefined
627 || h->root.type == bfd_link_hash_undefweak
628 || h->root.type == bfd_link_hash_common)
633 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
634 symbol, respectively, appears to be a common symbol in a dynamic
635 object. If a symbol appears in an uninitialized section, and is
636 not weak, and is not a function, then it may be a common symbol
637 which was resolved when the dynamic object was created. We want
638 to treat such symbols specially, because they raise special
639 considerations when setting the symbol size: if the symbol
640 appears as a common symbol in a regular object, and the size in
641 the regular object is larger, we must make sure that we use the
642 larger size. This problematic case can always be avoided in C,
643 but it must be handled correctly when using Fortran shared
646 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
647 likewise for OLDDYNCOMMON and OLDDEF.
649 Note that this test is just a heuristic, and that it is quite
650 possible to have an uninitialized symbol in a shared object which
651 is really a definition, rather than a common symbol. This could
652 lead to some minor confusion when the symbol really is a common
653 symbol in some regular object. However, I think it will be
658 && (sec->flags & SEC_ALLOC) != 0
659 && (sec->flags & SEC_LOAD) == 0
662 && ELF_ST_TYPE (sym->st_info) != STT_FUNC)
665 newdyncommon = false;
669 && h->root.type == bfd_link_hash_defined
670 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
671 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
672 && (h->root.u.def.section->flags & SEC_LOAD) == 0
674 && h->type != STT_FUNC)
677 olddyncommon = false;
679 /* It's OK to change the type if either the existing symbol or the
680 new symbol is weak unless it comes from a DT_NEEDED entry of
681 a shared object, in which case, the DT_NEEDED entry may not be
682 required at the run time. */
684 if ((! dt_needed && h->root.type == bfd_link_hash_defweak)
685 || h->root.type == bfd_link_hash_undefweak
687 *type_change_ok = true;
689 /* It's OK to change the size if either the existing symbol or the
690 new symbol is weak, or if the old symbol is undefined. */
693 || h->root.type == bfd_link_hash_undefined)
694 *size_change_ok = true;
696 /* If both the old and the new symbols look like common symbols in a
697 dynamic object, set the size of the symbol to the larger of the
702 && sym->st_size != h->size)
704 /* Since we think we have two common symbols, issue a multiple
705 common warning if desired. Note that we only warn if the
706 size is different. If the size is the same, we simply let
707 the old symbol override the new one as normally happens with
708 symbols defined in dynamic objects. */
710 if (! ((*info->callbacks->multiple_common)
711 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
712 h->size, abfd, bfd_link_hash_common, sym->st_size)))
715 if (sym->st_size > h->size)
716 h->size = sym->st_size;
718 *size_change_ok = true;
721 /* If we are looking at a dynamic object, and we have found a
722 definition, we need to see if the symbol was already defined by
723 some other object. If so, we want to use the existing
724 definition, and we do not want to report a multiple symbol
725 definition error; we do this by clobbering *PSEC to be
728 We treat a common symbol as a definition if the symbol in the
729 shared library is a function, since common symbols always
730 represent variables; this can cause confusion in principle, but
731 any such confusion would seem to indicate an erroneous program or
732 shared library. We also permit a common symbol in a regular
733 object to override a weak symbol in a shared object.
735 We prefer a non-weak definition in a shared library to a weak
736 definition in the executable unless it comes from a DT_NEEDED
737 entry of a shared object, in which case, the DT_NEEDED entry
738 may not be required at the run time. */
743 || (h->root.type == bfd_link_hash_common
745 || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))
746 && (h->root.type != bfd_link_hash_defweak
748 || bind == STB_WEAK))
752 newdyncommon = false;
754 *psec = sec = bfd_und_section_ptr;
755 *size_change_ok = true;
757 /* If we get here when the old symbol is a common symbol, then
758 we are explicitly letting it override a weak symbol or
759 function in a dynamic object, and we don't want to warn about
760 a type change. If the old symbol is a defined symbol, a type
761 change warning may still be appropriate. */
763 if (h->root.type == bfd_link_hash_common)
764 *type_change_ok = true;
767 /* Handle the special case of an old common symbol merging with a
768 new symbol which looks like a common symbol in a shared object.
769 We change *PSEC and *PVALUE to make the new symbol look like a
770 common symbol, and let _bfd_generic_link_add_one_symbol will do
774 && h->root.type == bfd_link_hash_common)
778 newdyncommon = false;
779 *pvalue = sym->st_size;
780 *psec = sec = bfd_com_section_ptr;
781 *size_change_ok = true;
784 /* If the old symbol is from a dynamic object, and the new symbol is
785 a definition which is not from a dynamic object, then the new
786 symbol overrides the old symbol. Symbols from regular files
787 always take precedence over symbols from dynamic objects, even if
788 they are defined after the dynamic object in the link.
790 As above, we again permit a common symbol in a regular object to
791 override a definition in a shared object if the shared object
792 symbol is a function or is weak.
794 As above, we permit a non-weak definition in a shared object to
795 override a weak definition in a regular object. */
799 || (bfd_is_com_section (sec)
800 && (h->root.type == bfd_link_hash_defweak
801 || h->type == STT_FUNC)))
804 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
806 || h->root.type == bfd_link_hash_defweak))
808 /* Change the hash table entry to undefined, and let
809 _bfd_generic_link_add_one_symbol do the right thing with the
812 h->root.type = bfd_link_hash_undefined;
813 h->root.u.undef.abfd = h->root.u.def.section->owner;
814 *size_change_ok = true;
817 olddyncommon = false;
819 /* We again permit a type change when a common symbol may be
820 overriding a function. */
822 if (bfd_is_com_section (sec))
823 *type_change_ok = true;
825 /* This union may have been set to be non-NULL when this symbol
826 was seen in a dynamic object. We must force the union to be
827 NULL, so that it is correct for a regular symbol. */
829 h->verinfo.vertree = NULL;
831 /* In this special case, if H is the target of an indirection,
832 we want the caller to frob with H rather than with the
833 indirect symbol. That will permit the caller to redefine the
834 target of the indirection, rather than the indirect symbol
835 itself. FIXME: This will break the -y option if we store a
836 symbol with a different name. */
840 /* Handle the special case of a new common symbol merging with an
841 old symbol that looks like it might be a common symbol defined in
842 a shared object. Note that we have already handled the case in
843 which a new common symbol should simply override the definition
844 in the shared library. */
847 && bfd_is_com_section (sec)
850 /* It would be best if we could set the hash table entry to a
851 common symbol, but we don't know what to use for the section
853 if (! ((*info->callbacks->multiple_common)
854 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
855 h->size, abfd, bfd_link_hash_common, sym->st_size)))
858 /* If the predumed common symbol in the dynamic object is
859 larger, pretend that the new symbol has its size. */
861 if (h->size > *pvalue)
864 /* FIXME: We no longer know the alignment required by the symbol
865 in the dynamic object, so we just wind up using the one from
866 the regular object. */
869 olddyncommon = false;
871 h->root.type = bfd_link_hash_undefined;
872 h->root.u.undef.abfd = h->root.u.def.section->owner;
874 *size_change_ok = true;
875 *type_change_ok = true;
877 h->verinfo.vertree = NULL;
880 /* Handle the special case of a weak definition in a regular object
881 followed by a non-weak definition in a shared object. In this
882 case, we prefer the definition in the shared object unless it
883 comes from a DT_NEEDED entry of a shared object, in which case,
884 the DT_NEEDED entry may not be required at the run time. */
887 && h->root.type == bfd_link_hash_defweak
892 /* To make this work we have to frob the flags so that the rest
893 of the code does not think we are using the regular
895 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
896 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
897 else if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)
898 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
899 h->elf_link_hash_flags &= ~ (ELF_LINK_HASH_DEF_REGULAR
900 | ELF_LINK_HASH_DEF_DYNAMIC);
902 /* If H is the target of an indirection, we want the caller to
903 use H rather than the indirect symbol. Otherwise if we are
904 defining a new indirect symbol we will wind up attaching it
905 to the entry we are overriding. */
909 /* Handle the special case of a non-weak definition in a shared
910 object followed by a weak definition in a regular object. In
911 this case we prefer to definition in the shared object. To make
912 this work we have to tell the caller to not treat the new symbol
916 && h->root.type != bfd_link_hash_defweak
925 /* This function is called to create an indirect symbol from the
926 default for the symbol with the default version if needed. The
927 symbol is described by H, NAME, SYM, SEC, VALUE, and OVERRIDE. We
928 set DYNSYM if the new indirect symbol is dynamic. DT_NEEDED
929 indicates if it comes from a DT_NEEDED entry of a shared object. */
932 elf_add_default_symbol (abfd, info, h, name, sym, sec, value,
933 dynsym, override, dt_needed)
935 struct bfd_link_info *info;
936 struct elf_link_hash_entry *h;
938 Elf_Internal_Sym *sym;
945 boolean type_change_ok;
946 boolean size_change_ok;
948 struct elf_link_hash_entry *hi;
949 struct elf_backend_data *bed;
954 /* If this symbol has a version, and it is the default version, we
955 create an indirect symbol from the default name to the fully
956 decorated name. This will cause external references which do not
957 specify a version to be bound to this version of the symbol. */
958 p = strchr (name, ELF_VER_CHR);
959 if (p == NULL || p[1] != ELF_VER_CHR)
964 /* We are overridden by an old defition. We need to check if we
965 need to crreate the indirect symbol from the default name. */
966 hi = elf_link_hash_lookup (elf_hash_table (info), name, true,
968 BFD_ASSERT (hi != NULL);
971 while (hi->root.type == bfd_link_hash_indirect
972 || hi->root.type == bfd_link_hash_warning)
974 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
980 bed = get_elf_backend_data (abfd);
981 collect = bed->collect;
982 dynamic = (abfd->flags & DYNAMIC) != 0;
984 shortname = bfd_hash_allocate (&info->hash->table,
985 (size_t) (p - name + 1));
986 if (shortname == NULL)
988 strncpy (shortname, name, (size_t) (p - name));
989 shortname [p - name] = '\0';
991 /* We are going to create a new symbol. Merge it with any existing
992 symbol with this name. For the purposes of the merge, act as
993 though we were defining the symbol we just defined, although we
994 actually going to define an indirect symbol. */
995 type_change_ok = false;
996 size_change_ok = false;
997 if (! elf_merge_symbol (abfd, info, shortname, sym, sec, value,
998 &hi, &override, &type_change_ok,
999 &size_change_ok, dt_needed))
1004 if (! (_bfd_generic_link_add_one_symbol
1005 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1006 (bfd_vma) 0, name, false, collect,
1007 (struct bfd_link_hash_entry **) &hi)))
1012 /* In this case the symbol named SHORTNAME is overriding the
1013 indirect symbol we want to add. We were planning on making
1014 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1015 is the name without a version. NAME is the fully versioned
1016 name, and it is the default version.
1018 Overriding means that we already saw a definition for the
1019 symbol SHORTNAME in a regular object, and it is overriding
1020 the symbol defined in the dynamic object.
1022 When this happens, we actually want to change NAME, the
1023 symbol we just added, to refer to SHORTNAME. This will cause
1024 references to NAME in the shared object to become references
1025 to SHORTNAME in the regular object. This is what we expect
1026 when we override a function in a shared object: that the
1027 references in the shared object will be mapped to the
1028 definition in the regular object. */
1030 while (hi->root.type == bfd_link_hash_indirect
1031 || hi->root.type == bfd_link_hash_warning)
1032 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1034 h->root.type = bfd_link_hash_indirect;
1035 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1036 if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC)
1038 h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC;
1039 hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
1040 if (hi->elf_link_hash_flags
1041 & (ELF_LINK_HASH_REF_REGULAR
1042 | ELF_LINK_HASH_DEF_REGULAR))
1044 if (! _bfd_elf_link_record_dynamic_symbol (info, hi))
1049 /* Now set HI to H, so that the following code will set the
1050 other fields correctly. */
1054 /* If there is a duplicate definition somewhere, then HI may not
1055 point to an indirect symbol. We will have reported an error to
1056 the user in that case. */
1058 if (hi->root.type == bfd_link_hash_indirect)
1060 struct elf_link_hash_entry *ht;
1062 /* If the symbol became indirect, then we assume that we have
1063 not seen a definition before. */
1064 BFD_ASSERT ((hi->elf_link_hash_flags
1065 & (ELF_LINK_HASH_DEF_DYNAMIC
1066 | ELF_LINK_HASH_DEF_REGULAR)) == 0);
1068 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1069 (*bed->elf_backend_copy_indirect_symbol) (ht, hi);
1071 /* See if the new flags lead us to realize that the symbol must
1078 || ((hi->elf_link_hash_flags
1079 & ELF_LINK_HASH_REF_DYNAMIC) != 0))
1084 if ((hi->elf_link_hash_flags
1085 & ELF_LINK_HASH_REF_REGULAR) != 0)
1091 /* We also need to define an indirection from the nondefault version
1094 shortname = bfd_hash_allocate (&info->hash->table, strlen (name));
1095 if (shortname == NULL)
1097 strncpy (shortname, name, (size_t) (p - name));
1098 strcpy (shortname + (p - name), p + 1);
1100 /* Once again, merge with any existing symbol. */
1101 type_change_ok = false;
1102 size_change_ok = false;
1103 if (! elf_merge_symbol (abfd, info, shortname, sym, sec, value,
1104 &hi, &override, &type_change_ok,
1105 &size_change_ok, dt_needed))
1110 /* Here SHORTNAME is a versioned name, so we don't expect to see
1111 the type of override we do in the case above. */
1112 (*_bfd_error_handler)
1113 (_("%s: warning: unexpected redefinition of `%s'"),
1114 bfd_archive_filename (abfd), shortname);
1118 if (! (_bfd_generic_link_add_one_symbol
1119 (info, abfd, shortname, BSF_INDIRECT,
1120 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1121 collect, (struct bfd_link_hash_entry **) &hi)))
1124 /* If there is a duplicate definition somewhere, then HI may not
1125 point to an indirect symbol. We will have reported an error
1126 to the user in that case. */
1128 if (hi->root.type == bfd_link_hash_indirect)
1130 /* If the symbol became indirect, then we assume that we have
1131 not seen a definition before. */
1132 BFD_ASSERT ((hi->elf_link_hash_flags
1133 & (ELF_LINK_HASH_DEF_DYNAMIC
1134 | ELF_LINK_HASH_DEF_REGULAR)) == 0);
1136 (*bed->elf_backend_copy_indirect_symbol) (h, hi);
1138 /* See if the new flags lead us to realize that the symbol
1145 || ((hi->elf_link_hash_flags
1146 & ELF_LINK_HASH_REF_DYNAMIC) != 0))
1151 if ((hi->elf_link_hash_flags
1152 & ELF_LINK_HASH_REF_REGULAR) != 0)
1162 /* Add symbols from an ELF object file to the linker hash table. */
1165 elf_link_add_object_symbols (abfd, info)
1167 struct bfd_link_info *info;
1169 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
1170 const Elf_Internal_Sym *,
1171 const char **, flagword *,
1172 asection **, bfd_vma *));
1173 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
1174 asection *, const Elf_Internal_Rela *));
1176 Elf_Internal_Shdr *hdr;
1177 Elf_Internal_Shdr *shndx_hdr;
1178 bfd_size_type symcount;
1179 bfd_size_type extsymcount;
1180 bfd_size_type extsymoff;
1181 Elf_External_Sym *buf = NULL;
1182 Elf_External_Sym_Shndx *shndx_buf = NULL;
1183 Elf_External_Sym_Shndx *shndx;
1184 struct elf_link_hash_entry **sym_hash;
1186 Elf_External_Versym *extversym = NULL;
1187 Elf_External_Versym *ever;
1188 Elf_External_Dyn *dynbuf = NULL;
1189 struct elf_link_hash_entry *weaks;
1190 Elf_External_Sym *esym;
1191 Elf_External_Sym *esymend;
1192 struct elf_backend_data *bed;
1194 struct elf_link_hash_table * hash_table;
1198 hash_table = elf_hash_table (info);
1200 bed = get_elf_backend_data (abfd);
1201 add_symbol_hook = bed->elf_add_symbol_hook;
1202 collect = bed->collect;
1204 if ((abfd->flags & DYNAMIC) == 0)
1210 /* You can't use -r against a dynamic object. Also, there's no
1211 hope of using a dynamic object which does not exactly match
1212 the format of the output file. */
1213 if (info->relocateable || info->hash->creator != abfd->xvec)
1215 bfd_set_error (bfd_error_invalid_operation);
1220 /* As a GNU extension, any input sections which are named
1221 .gnu.warning.SYMBOL are treated as warning symbols for the given
1222 symbol. This differs from .gnu.warning sections, which generate
1223 warnings when they are included in an output file. */
1228 for (s = abfd->sections; s != NULL; s = s->next)
1232 name = bfd_get_section_name (abfd, s);
1233 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
1238 name += sizeof ".gnu.warning." - 1;
1240 /* If this is a shared object, then look up the symbol
1241 in the hash table. If it is there, and it is already
1242 been defined, then we will not be using the entry
1243 from this shared object, so we don't need to warn.
1244 FIXME: If we see the definition in a regular object
1245 later on, we will warn, but we shouldn't. The only
1246 fix is to keep track of what warnings we are supposed
1247 to emit, and then handle them all at the end of the
1249 if (dynamic && abfd->xvec == info->hash->creator)
1251 struct elf_link_hash_entry *h;
1253 h = elf_link_hash_lookup (hash_table, name,
1254 false, false, true);
1256 /* FIXME: What about bfd_link_hash_common? */
1258 && (h->root.type == bfd_link_hash_defined
1259 || h->root.type == bfd_link_hash_defweak))
1261 /* We don't want to issue this warning. Clobber
1262 the section size so that the warning does not
1263 get copied into the output file. */
1269 sz = bfd_section_size (abfd, s);
1270 msg = (char *) bfd_alloc (abfd, sz + 1);
1274 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
1279 if (! (_bfd_generic_link_add_one_symbol
1280 (info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg,
1281 false, collect, (struct bfd_link_hash_entry **) NULL)))
1284 if (! info->relocateable)
1286 /* Clobber the section size so that the warning does
1287 not get copied into the output file. */
1294 /* If this is a dynamic object, we always link against the .dynsym
1295 symbol table, not the .symtab symbol table. The dynamic linker
1296 will only see the .dynsym symbol table, so there is no reason to
1297 look at .symtab for a dynamic object. */
1299 if (! dynamic || elf_dynsymtab (abfd) == 0)
1301 hdr = &elf_tdata (abfd)->symtab_hdr;
1302 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
1306 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
1312 /* Read in any version definitions. */
1314 if (! _bfd_elf_slurp_version_tables (abfd))
1317 /* Read in the symbol versions, but don't bother to convert them
1318 to internal format. */
1319 if (elf_dynversym (abfd) != 0)
1321 Elf_Internal_Shdr *versymhdr;
1323 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
1324 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
1325 if (extversym == NULL)
1327 amt = versymhdr->sh_size;
1328 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
1329 || bfd_bread ((PTR) extversym, amt, abfd) != amt)
1334 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1336 /* The sh_info field of the symtab header tells us where the
1337 external symbols start. We don't care about the local symbols at
1339 if (elf_bad_symtab (abfd))
1341 extsymcount = symcount;
1346 extsymcount = symcount - hdr->sh_info;
1347 extsymoff = hdr->sh_info;
1350 amt = extsymcount * sizeof (Elf_External_Sym);
1351 buf = (Elf_External_Sym *) bfd_malloc (amt);
1352 if (buf == NULL && extsymcount != 0)
1355 if (shndx_hdr != NULL && shndx_hdr->sh_size != 0)
1357 amt = extsymcount * sizeof (Elf_External_Sym_Shndx);
1358 shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
1359 if (shndx_buf == NULL && extsymcount != 0)
1363 /* We store a pointer to the hash table entry for each external
1365 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
1366 sym_hash = (struct elf_link_hash_entry **) bfd_alloc (abfd, amt);
1367 if (sym_hash == NULL)
1369 elf_sym_hashes (abfd) = sym_hash;
1375 /* If we are creating a shared library, create all the dynamic
1376 sections immediately. We need to attach them to something,
1377 so we attach them to this BFD, provided it is the right
1378 format. FIXME: If there are no input BFD's of the same
1379 format as the output, we can't make a shared library. */
1381 && is_elf_hash_table (info)
1382 && ! hash_table->dynamic_sections_created
1383 && abfd->xvec == info->hash->creator)
1385 if (! elf_link_create_dynamic_sections (abfd, info))
1389 else if (! is_elf_hash_table (info))
1396 bfd_size_type oldsize;
1397 bfd_size_type strindex;
1399 /* Find the name to use in a DT_NEEDED entry that refers to this
1400 object. If the object has a DT_SONAME entry, we use it.
1401 Otherwise, if the generic linker stuck something in
1402 elf_dt_name, we use that. Otherwise, we just use the file
1403 name. If the generic linker put a null string into
1404 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1405 there is a DT_SONAME entry. */
1407 name = bfd_get_filename (abfd);
1408 if (elf_dt_name (abfd) != NULL)
1410 name = elf_dt_name (abfd);
1413 if (elf_dt_soname (abfd) != NULL)
1419 s = bfd_get_section_by_name (abfd, ".dynamic");
1422 Elf_External_Dyn *extdyn;
1423 Elf_External_Dyn *extdynend;
1425 unsigned long shlink;
1429 dynbuf = (Elf_External_Dyn *) bfd_malloc (s->_raw_size);
1433 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
1434 (file_ptr) 0, s->_raw_size))
1437 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1440 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
1443 /* The shared libraries distributed with hpux11 have a bogus
1444 sh_link field for the ".dynamic" section. This code detects
1445 when SHLINK refers to a section that is not a string table
1446 and tries to find the string table for the ".dynsym" section
1448 Elf_Internal_Shdr *shdr = elf_elfsections (abfd)[shlink];
1449 if (shdr->sh_type != SHT_STRTAB)
1451 asection *ds = bfd_get_section_by_name (abfd, ".dynsym");
1452 int elfdsec = _bfd_elf_section_from_bfd_section (abfd, ds);
1455 shlink = elf_elfsections (abfd)[elfdsec]->sh_link;
1460 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
1463 for (; extdyn < extdynend; extdyn++)
1465 Elf_Internal_Dyn dyn;
1467 elf_swap_dyn_in (abfd, extdyn, &dyn);
1468 if (dyn.d_tag == DT_SONAME)
1470 unsigned int tagv = dyn.d_un.d_val;
1471 name = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1475 if (dyn.d_tag == DT_NEEDED)
1477 struct bfd_link_needed_list *n, **pn;
1479 unsigned int tagv = dyn.d_un.d_val;
1481 amt = sizeof (struct bfd_link_needed_list);
1482 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1483 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1484 if (n == NULL || fnm == NULL)
1486 anm = bfd_alloc (abfd, (bfd_size_type) strlen (fnm) + 1);
1493 for (pn = & hash_table->needed;
1499 if (dyn.d_tag == DT_RUNPATH)
1501 struct bfd_link_needed_list *n, **pn;
1503 unsigned int tagv = dyn.d_un.d_val;
1505 /* When we see DT_RPATH before DT_RUNPATH, we have
1506 to clear runpath. Do _NOT_ bfd_release, as that
1507 frees all more recently bfd_alloc'd blocks as
1509 if (rpath && hash_table->runpath)
1510 hash_table->runpath = NULL;
1512 amt = sizeof (struct bfd_link_needed_list);
1513 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1514 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1515 if (n == NULL || fnm == NULL)
1517 anm = bfd_alloc (abfd, (bfd_size_type) strlen (fnm) + 1);
1524 for (pn = & hash_table->runpath;
1532 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1533 if (!runpath && dyn.d_tag == DT_RPATH)
1535 struct bfd_link_needed_list *n, **pn;
1537 unsigned int tagv = dyn.d_un.d_val;
1539 amt = sizeof (struct bfd_link_needed_list);
1540 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1541 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1542 if (n == NULL || fnm == NULL)
1544 anm = bfd_alloc (abfd, (bfd_size_type) strlen (fnm) + 1);
1551 for (pn = & hash_table->runpath;
1564 /* We do not want to include any of the sections in a dynamic
1565 object in the output file. We hack by simply clobbering the
1566 list of sections in the BFD. This could be handled more
1567 cleanly by, say, a new section flag; the existing
1568 SEC_NEVER_LOAD flag is not the one we want, because that one
1569 still implies that the section takes up space in the output
1571 bfd_section_list_clear (abfd);
1573 /* If this is the first dynamic object found in the link, create
1574 the special sections required for dynamic linking. */
1575 if (! hash_table->dynamic_sections_created)
1576 if (! elf_link_create_dynamic_sections (abfd, info))
1581 /* Add a DT_NEEDED entry for this dynamic object. */
1582 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
1583 strindex = _bfd_elf_strtab_add (hash_table->dynstr, name, false);
1584 if (strindex == (bfd_size_type) -1)
1587 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
1590 Elf_External_Dyn *dyncon, *dynconend;
1592 /* The hash table size did not change, which means that
1593 the dynamic object name was already entered. If we
1594 have already included this dynamic object in the
1595 link, just ignore it. There is no reason to include
1596 a particular dynamic object more than once. */
1597 sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
1598 BFD_ASSERT (sdyn != NULL);
1600 dyncon = (Elf_External_Dyn *) sdyn->contents;
1601 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1603 for (; dyncon < dynconend; dyncon++)
1605 Elf_Internal_Dyn dyn;
1607 elf_swap_dyn_in (hash_table->dynobj, dyncon, & dyn);
1608 if (dyn.d_tag == DT_NEEDED
1609 && dyn.d_un.d_val == strindex)
1613 if (extversym != NULL)
1615 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
1621 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NEEDED, strindex))
1625 /* Save the SONAME, if there is one, because sometimes the
1626 linker emulation code will need to know it. */
1628 name = basename (bfd_get_filename (abfd));
1629 elf_dt_name (abfd) = name;
1632 pos = hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym);
1633 amt = extsymcount * sizeof (Elf_External_Sym);
1634 if (bfd_seek (abfd, pos, SEEK_SET) != 0
1635 || bfd_bread ((PTR) buf, amt, abfd) != amt)
1638 if (shndx_hdr != NULL && shndx_hdr->sh_size != 0)
1640 amt = extsymcount * sizeof (Elf_External_Sym_Shndx);
1641 pos = shndx_hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym_Shndx);
1642 if (bfd_seek (abfd, pos, SEEK_SET) != 0
1643 || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
1649 ever = extversym != NULL ? extversym + extsymoff : NULL;
1650 esymend = buf + extsymcount;
1651 for (esym = buf, shndx = shndx_buf;
1653 esym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL),
1654 shndx = (shndx != NULL ? shndx + 1 : NULL))
1656 Elf_Internal_Sym sym;
1662 struct elf_link_hash_entry *h;
1664 boolean size_change_ok, type_change_ok;
1665 boolean new_weakdef;
1666 unsigned int old_alignment;
1671 elf_swap_symbol_in (abfd, esym, shndx, &sym);
1673 flags = BSF_NO_FLAGS;
1675 value = sym.st_value;
1678 bind = ELF_ST_BIND (sym.st_info);
1679 if (bind == STB_LOCAL)
1681 /* This should be impossible, since ELF requires that all
1682 global symbols follow all local symbols, and that sh_info
1683 point to the first global symbol. Unfortunatealy, Irix 5
1687 else if (bind == STB_GLOBAL)
1689 if (sym.st_shndx != SHN_UNDEF
1690 && sym.st_shndx != SHN_COMMON)
1693 else if (bind == STB_WEAK)
1697 /* Leave it up to the processor backend. */
1700 if (sym.st_shndx == SHN_UNDEF)
1701 sec = bfd_und_section_ptr;
1702 else if (sym.st_shndx < SHN_LORESERVE || sym.st_shndx > SHN_HIRESERVE)
1704 sec = section_from_elf_index (abfd, sym.st_shndx);
1706 sec = bfd_abs_section_ptr;
1707 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
1710 else if (sym.st_shndx == SHN_ABS)
1711 sec = bfd_abs_section_ptr;
1712 else if (sym.st_shndx == SHN_COMMON)
1714 sec = bfd_com_section_ptr;
1715 /* What ELF calls the size we call the value. What ELF
1716 calls the value we call the alignment. */
1717 value = sym.st_size;
1721 /* Leave it up to the processor backend. */
1724 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
1725 if (name == (const char *) NULL)
1728 if (add_symbol_hook)
1730 if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
1734 /* The hook function sets the name to NULL if this symbol
1735 should be skipped for some reason. */
1736 if (name == (const char *) NULL)
1740 /* Sanity check that all possibilities were handled. */
1741 if (sec == (asection *) NULL)
1743 bfd_set_error (bfd_error_bad_value);
1747 if (bfd_is_und_section (sec)
1748 || bfd_is_com_section (sec))
1753 size_change_ok = false;
1754 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
1756 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1758 Elf_Internal_Versym iver;
1759 unsigned int vernum = 0;
1763 _bfd_elf_swap_versym_in (abfd, ever, &iver);
1764 vernum = iver.vs_vers & VERSYM_VERSION;
1766 /* If this is a hidden symbol, or if it is not version
1767 1, we append the version name to the symbol name.
1768 However, we do not modify a non-hidden absolute
1769 symbol, because it might be the version symbol
1770 itself. FIXME: What if it isn't? */
1771 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
1772 || (vernum > 1 && ! bfd_is_abs_section (sec)))
1775 unsigned int namelen;
1776 bfd_size_type newlen;
1779 if (sym.st_shndx != SHN_UNDEF)
1781 if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
1783 (*_bfd_error_handler)
1784 (_("%s: %s: invalid version %u (max %d)"),
1785 bfd_archive_filename (abfd), name, vernum,
1786 elf_tdata (abfd)->dynverdef_hdr.sh_info);
1787 bfd_set_error (bfd_error_bad_value);
1790 else if (vernum > 1)
1792 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
1798 /* We cannot simply test for the number of
1799 entries in the VERNEED section since the
1800 numbers for the needed versions do not start
1802 Elf_Internal_Verneed *t;
1805 for (t = elf_tdata (abfd)->verref;
1809 Elf_Internal_Vernaux *a;
1811 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1813 if (a->vna_other == vernum)
1815 verstr = a->vna_nodename;
1824 (*_bfd_error_handler)
1825 (_("%s: %s: invalid needed version %d"),
1826 bfd_archive_filename (abfd), name, vernum);
1827 bfd_set_error (bfd_error_bad_value);
1832 namelen = strlen (name);
1833 newlen = namelen + strlen (verstr) + 2;
1834 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
1837 newname = (char *) bfd_alloc (abfd, newlen);
1838 if (newname == NULL)
1840 strcpy (newname, name);
1841 p = newname + namelen;
1843 /* If this is a defined non-hidden version symbol,
1844 we add another @ to the name. This indicates the
1845 default version of the symbol. */
1846 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
1847 && sym.st_shndx != SHN_UNDEF)
1855 if (! elf_merge_symbol (abfd, info, name, &sym, &sec, &value,
1856 sym_hash, &override, &type_change_ok,
1857 &size_change_ok, dt_needed))
1864 while (h->root.type == bfd_link_hash_indirect
1865 || h->root.type == bfd_link_hash_warning)
1866 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1868 /* Remember the old alignment if this is a common symbol, so
1869 that we don't reduce the alignment later on. We can't
1870 check later, because _bfd_generic_link_add_one_symbol
1871 will set a default for the alignment which we want to
1873 if (h->root.type == bfd_link_hash_common)
1874 old_alignment = h->root.u.c.p->alignment_power;
1876 if (elf_tdata (abfd)->verdef != NULL
1880 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
1883 if (! (_bfd_generic_link_add_one_symbol
1884 (info, abfd, name, flags, sec, value, (const char *) NULL,
1885 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
1889 while (h->root.type == bfd_link_hash_indirect
1890 || h->root.type == bfd_link_hash_warning)
1891 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1894 new_weakdef = false;
1897 && (flags & BSF_WEAK) != 0
1898 && ELF_ST_TYPE (sym.st_info) != STT_FUNC
1899 && info->hash->creator->flavour == bfd_target_elf_flavour
1900 && h->weakdef == NULL)
1902 /* Keep a list of all weak defined non function symbols from
1903 a dynamic object, using the weakdef field. Later in this
1904 function we will set the weakdef field to the correct
1905 value. We only put non-function symbols from dynamic
1906 objects on this list, because that happens to be the only
1907 time we need to know the normal symbol corresponding to a
1908 weak symbol, and the information is time consuming to
1909 figure out. If the weakdef field is not already NULL,
1910 then this symbol was already defined by some previous
1911 dynamic object, and we will be using that previous
1912 definition anyhow. */
1919 /* Set the alignment of a common symbol. */
1920 if (sym.st_shndx == SHN_COMMON
1921 && h->root.type == bfd_link_hash_common)
1925 align = bfd_log2 (sym.st_value);
1926 if (align > old_alignment
1927 /* Permit an alignment power of zero if an alignment of one
1928 is specified and no other alignments have been specified. */
1929 || (sym.st_value == 1 && old_alignment == 0))
1930 h->root.u.c.p->alignment_power = align;
1933 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1939 /* Remember the symbol size and type. */
1940 if (sym.st_size != 0
1941 && (definition || h->size == 0))
1943 if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
1944 (*_bfd_error_handler)
1945 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1946 name, (unsigned long) h->size, (unsigned long) sym.st_size,
1947 bfd_archive_filename (abfd));
1949 h->size = sym.st_size;
1952 /* If this is a common symbol, then we always want H->SIZE
1953 to be the size of the common symbol. The code just above
1954 won't fix the size if a common symbol becomes larger. We
1955 don't warn about a size change here, because that is
1956 covered by --warn-common. */
1957 if (h->root.type == bfd_link_hash_common)
1958 h->size = h->root.u.c.size;
1960 if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
1961 && (definition || h->type == STT_NOTYPE))
1963 if (h->type != STT_NOTYPE
1964 && h->type != ELF_ST_TYPE (sym.st_info)
1965 && ! type_change_ok)
1966 (*_bfd_error_handler)
1967 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1968 name, h->type, ELF_ST_TYPE (sym.st_info),
1969 bfd_archive_filename (abfd));
1971 h->type = ELF_ST_TYPE (sym.st_info);
1974 /* If st_other has a processor-specific meaning, specific code
1975 might be needed here. */
1976 if (sym.st_other != 0)
1978 /* Combine visibilities, using the most constraining one. */
1979 unsigned char hvis = ELF_ST_VISIBILITY (h->other);
1980 unsigned char symvis = ELF_ST_VISIBILITY (sym.st_other);
1982 if (symvis && (hvis > symvis || hvis == 0))
1983 h->other = sym.st_other;
1985 /* If neither has visibility, use the st_other of the
1986 definition. This is an arbitrary choice, since the
1987 other bits have no general meaning. */
1988 if (!symvis && !hvis
1989 && (definition || h->other == 0))
1990 h->other = sym.st_other;
1993 /* Set a flag in the hash table entry indicating the type of
1994 reference or definition we just found. Keep a count of
1995 the number of dynamic symbols we find. A dynamic symbol
1996 is one which is referenced or defined by both a regular
1997 object and a shared object. */
1998 old_flags = h->elf_link_hash_flags;
2004 new_flag = ELF_LINK_HASH_REF_REGULAR;
2005 if (bind != STB_WEAK)
2006 new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK;
2009 new_flag = ELF_LINK_HASH_DEF_REGULAR;
2011 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2012 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
2018 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
2020 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
2021 if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
2022 | ELF_LINK_HASH_REF_REGULAR)) != 0
2023 || (h->weakdef != NULL
2025 && h->weakdef->dynindx != -1))
2029 h->elf_link_hash_flags |= new_flag;
2031 /* Check to see if we need to add an indirect symbol for
2032 the default name. */
2033 if (definition || h->root.type == bfd_link_hash_common)
2034 if (! elf_add_default_symbol (abfd, info, h, name, &sym,
2035 &sec, &value, &dynsym,
2036 override, dt_needed))
2039 if (dynsym && h->dynindx == -1)
2041 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2043 if (h->weakdef != NULL
2045 && h->weakdef->dynindx == -1)
2047 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2051 else if (dynsym && h->dynindx != -1)
2052 /* If the symbol already has a dynamic index, but
2053 visibility says it should not be visible, turn it into
2055 switch (ELF_ST_VISIBILITY (h->other))
2059 (*bed->elf_backend_hide_symbol) (info, h, true);
2063 if (dt_needed && definition
2064 && (h->elf_link_hash_flags
2065 & ELF_LINK_HASH_REF_REGULAR) != 0)
2067 bfd_size_type oldsize;
2068 bfd_size_type strindex;
2070 if (! is_elf_hash_table (info))
2073 /* The symbol from a DT_NEEDED object is referenced from
2074 the regular object to create a dynamic executable. We
2075 have to make sure there is a DT_NEEDED entry for it. */
2078 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
2079 strindex = _bfd_elf_strtab_add (hash_table->dynstr,
2080 elf_dt_soname (abfd), false);
2081 if (strindex == (bfd_size_type) -1)
2084 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
2087 Elf_External_Dyn *dyncon, *dynconend;
2089 sdyn = bfd_get_section_by_name (hash_table->dynobj,
2091 BFD_ASSERT (sdyn != NULL);
2093 dyncon = (Elf_External_Dyn *) sdyn->contents;
2094 dynconend = (Elf_External_Dyn *) (sdyn->contents +
2096 for (; dyncon < dynconend; dyncon++)
2098 Elf_Internal_Dyn dyn;
2100 elf_swap_dyn_in (hash_table->dynobj,
2102 BFD_ASSERT (dyn.d_tag != DT_NEEDED ||
2103 dyn.d_un.d_val != strindex);
2107 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NEEDED, strindex))
2113 /* Now set the weakdefs field correctly for all the weak defined
2114 symbols we found. The only way to do this is to search all the
2115 symbols. Since we only need the information for non functions in
2116 dynamic objects, that's the only time we actually put anything on
2117 the list WEAKS. We need this information so that if a regular
2118 object refers to a symbol defined weakly in a dynamic object, the
2119 real symbol in the dynamic object is also put in the dynamic
2120 symbols; we also must arrange for both symbols to point to the
2121 same memory location. We could handle the general case of symbol
2122 aliasing, but a general symbol alias can only be generated in
2123 assembler code, handling it correctly would be very time
2124 consuming, and other ELF linkers don't handle general aliasing
2126 while (weaks != NULL)
2128 struct elf_link_hash_entry *hlook;
2131 struct elf_link_hash_entry **hpp;
2132 struct elf_link_hash_entry **hppend;
2135 weaks = hlook->weakdef;
2136 hlook->weakdef = NULL;
2138 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
2139 || hlook->root.type == bfd_link_hash_defweak
2140 || hlook->root.type == bfd_link_hash_common
2141 || hlook->root.type == bfd_link_hash_indirect);
2142 slook = hlook->root.u.def.section;
2143 vlook = hlook->root.u.def.value;
2145 hpp = elf_sym_hashes (abfd);
2146 hppend = hpp + extsymcount;
2147 for (; hpp < hppend; hpp++)
2149 struct elf_link_hash_entry *h;
2152 if (h != NULL && h != hlook
2153 && h->root.type == bfd_link_hash_defined
2154 && h->root.u.def.section == slook
2155 && h->root.u.def.value == vlook)
2159 /* If the weak definition is in the list of dynamic
2160 symbols, make sure the real definition is put there
2162 if (hlook->dynindx != -1
2163 && h->dynindx == -1)
2165 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2169 /* If the real definition is in the list of dynamic
2170 symbols, make sure the weak definition is put there
2171 as well. If we don't do this, then the dynamic
2172 loader might not merge the entries for the real
2173 definition and the weak definition. */
2174 if (h->dynindx != -1
2175 && hlook->dynindx == -1)
2177 if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
2192 if (extversym != NULL)
2198 /* If this object is the same format as the output object, and it is
2199 not a shared library, then let the backend look through the
2202 This is required to build global offset table entries and to
2203 arrange for dynamic relocs. It is not required for the
2204 particular common case of linking non PIC code, even when linking
2205 against shared libraries, but unfortunately there is no way of
2206 knowing whether an object file has been compiled PIC or not.
2207 Looking through the relocs is not particularly time consuming.
2208 The problem is that we must either (1) keep the relocs in memory,
2209 which causes the linker to require additional runtime memory or
2210 (2) read the relocs twice from the input file, which wastes time.
2211 This would be a good case for using mmap.
2213 I have no idea how to handle linking PIC code into a file of a
2214 different format. It probably can't be done. */
2215 check_relocs = get_elf_backend_data (abfd)->check_relocs;
2217 && abfd->xvec == info->hash->creator
2218 && check_relocs != NULL)
2222 for (o = abfd->sections; o != NULL; o = o->next)
2224 Elf_Internal_Rela *internal_relocs;
2227 if ((o->flags & SEC_RELOC) == 0
2228 || o->reloc_count == 0
2229 || ((info->strip == strip_all || info->strip == strip_debugger)
2230 && (o->flags & SEC_DEBUGGING) != 0)
2231 || bfd_is_abs_section (o->output_section))
2234 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2235 (abfd, o, (PTR) NULL,
2236 (Elf_Internal_Rela *) NULL,
2237 info->keep_memory));
2238 if (internal_relocs == NULL)
2241 ok = (*check_relocs) (abfd, info, o, internal_relocs);
2243 if (! info->keep_memory)
2244 free (internal_relocs);
2251 /* If this is a non-traditional, non-relocateable link, try to
2252 optimize the handling of the .stab/.stabstr sections. */
2254 && ! info->relocateable
2255 && ! info->traditional_format
2256 && info->hash->creator->flavour == bfd_target_elf_flavour
2257 && is_elf_hash_table (info)
2258 && (info->strip != strip_all && info->strip != strip_debugger))
2260 asection *stab, *stabstr;
2262 stab = bfd_get_section_by_name (abfd, ".stab");
2263 if (stab != NULL && !(stab->flags & SEC_MERGE))
2265 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
2267 if (stabstr != NULL)
2269 struct bfd_elf_section_data *secdata;
2271 secdata = elf_section_data (stab);
2272 if (! _bfd_link_section_stabs (abfd,
2273 & hash_table->stab_info,
2275 &secdata->sec_info))
2277 if (secdata->sec_info)
2278 secdata->sec_info_type = ELF_INFO_TYPE_STABS;
2283 if (! info->relocateable && ! dynamic
2284 && is_elf_hash_table (info))
2288 for (s = abfd->sections; s != NULL; s = s->next)
2289 if (s->flags & SEC_MERGE)
2291 struct bfd_elf_section_data *secdata;
2293 secdata = elf_section_data (s);
2294 if (! _bfd_merge_section (abfd,
2295 & hash_table->merge_info,
2296 s, &secdata->sec_info))
2298 else if (secdata->sec_info)
2299 secdata->sec_info_type = ELF_INFO_TYPE_MERGE;
2310 if (extversym != NULL)
2315 /* Create some sections which will be filled in with dynamic linking
2316 information. ABFD is an input file which requires dynamic sections
2317 to be created. The dynamic sections take up virtual memory space
2318 when the final executable is run, so we need to create them before
2319 addresses are assigned to the output sections. We work out the
2320 actual contents and size of these sections later. */
2323 elf_link_create_dynamic_sections (abfd, info)
2325 struct bfd_link_info *info;
2328 register asection *s;
2329 struct elf_link_hash_entry *h;
2330 struct elf_backend_data *bed;
2332 if (! is_elf_hash_table (info))
2335 if (elf_hash_table (info)->dynamic_sections_created)
2338 /* Make sure that all dynamic sections use the same input BFD. */
2339 if (elf_hash_table (info)->dynobj == NULL)
2340 elf_hash_table (info)->dynobj = abfd;
2342 abfd = elf_hash_table (info)->dynobj;
2344 /* Note that we set the SEC_IN_MEMORY flag for all of these
2346 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
2347 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2349 /* A dynamically linked executable has a .interp section, but a
2350 shared library does not. */
2353 s = bfd_make_section (abfd, ".interp");
2355 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2359 if (! info->traditional_format
2360 && info->hash->creator->flavour == bfd_target_elf_flavour)
2362 s = bfd_make_section (abfd, ".eh_frame_hdr");
2364 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2365 || ! bfd_set_section_alignment (abfd, s, 2))
2369 /* Create sections to hold version informations. These are removed
2370 if they are not needed. */
2371 s = bfd_make_section (abfd, ".gnu.version_d");
2373 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2374 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2377 s = bfd_make_section (abfd, ".gnu.version");
2379 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2380 || ! bfd_set_section_alignment (abfd, s, 1))
2383 s = bfd_make_section (abfd, ".gnu.version_r");
2385 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2386 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2389 s = bfd_make_section (abfd, ".dynsym");
2391 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2392 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2395 s = bfd_make_section (abfd, ".dynstr");
2397 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2400 /* Create a strtab to hold the dynamic symbol names. */
2401 if (elf_hash_table (info)->dynstr == NULL)
2403 elf_hash_table (info)->dynstr = _bfd_elf_strtab_init ();
2404 if (elf_hash_table (info)->dynstr == NULL)
2408 s = bfd_make_section (abfd, ".dynamic");
2410 || ! bfd_set_section_flags (abfd, s, flags)
2411 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2414 /* The special symbol _DYNAMIC is always set to the start of the
2415 .dynamic section. This call occurs before we have processed the
2416 symbols for any dynamic object, so we don't have to worry about
2417 overriding a dynamic definition. We could set _DYNAMIC in a
2418 linker script, but we only want to define it if we are, in fact,
2419 creating a .dynamic section. We don't want to define it if there
2420 is no .dynamic section, since on some ELF platforms the start up
2421 code examines it to decide how to initialize the process. */
2423 if (! (_bfd_generic_link_add_one_symbol
2424 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
2425 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
2426 (struct bfd_link_hash_entry **) &h)))
2428 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2429 h->type = STT_OBJECT;
2432 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
2435 bed = get_elf_backend_data (abfd);
2437 s = bfd_make_section (abfd, ".hash");
2439 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2440 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2442 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
2444 /* Let the backend create the rest of the sections. This lets the
2445 backend set the right flags. The backend will normally create
2446 the .got and .plt sections. */
2447 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
2450 elf_hash_table (info)->dynamic_sections_created = true;
2455 /* Add an entry to the .dynamic table. */
2458 elf_add_dynamic_entry (info, tag, val)
2459 struct bfd_link_info *info;
2463 Elf_Internal_Dyn dyn;
2466 bfd_size_type newsize;
2467 bfd_byte *newcontents;
2469 if (! is_elf_hash_table (info))
2472 dynobj = elf_hash_table (info)->dynobj;
2474 s = bfd_get_section_by_name (dynobj, ".dynamic");
2475 BFD_ASSERT (s != NULL);
2477 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
2478 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
2479 if (newcontents == NULL)
2483 dyn.d_un.d_val = val;
2484 elf_swap_dyn_out (dynobj, &dyn,
2485 (Elf_External_Dyn *) (newcontents + s->_raw_size));
2487 s->_raw_size = newsize;
2488 s->contents = newcontents;
2493 /* Record a new local dynamic symbol. */
2496 elf_link_record_local_dynamic_symbol (info, input_bfd, input_indx)
2497 struct bfd_link_info *info;
2501 struct elf_link_local_dynamic_entry *entry;
2502 struct elf_link_hash_table *eht;
2503 struct elf_strtab_hash *dynstr;
2504 Elf_External_Sym esym;
2505 Elf_External_Sym_Shndx eshndx;
2506 Elf_External_Sym_Shndx *shndx;
2507 unsigned long dynstr_index;
2512 if (! is_elf_hash_table (info))
2515 /* See if the entry exists already. */
2516 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
2517 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
2520 entry = (struct elf_link_local_dynamic_entry *)
2521 bfd_alloc (input_bfd, (bfd_size_type) sizeof (*entry));
2525 /* Go find the symbol, so that we can find it's name. */
2526 amt = sizeof (Elf_External_Sym);
2527 pos = elf_tdata (input_bfd)->symtab_hdr.sh_offset + input_indx * amt;
2528 if (bfd_seek (input_bfd, pos, SEEK_SET) != 0
2529 || bfd_bread ((PTR) &esym, amt, input_bfd) != amt)
2532 if (elf_tdata (input_bfd)->symtab_shndx_hdr.sh_size != 0)
2534 amt = sizeof (Elf_External_Sym_Shndx);
2535 pos = elf_tdata (input_bfd)->symtab_shndx_hdr.sh_offset;
2536 pos += input_indx * amt;
2538 if (bfd_seek (input_bfd, pos, SEEK_SET) != 0
2539 || bfd_bread ((PTR) shndx, amt, input_bfd) != amt)
2542 elf_swap_symbol_in (input_bfd, &esym, shndx, &entry->isym);
2544 name = (bfd_elf_string_from_elf_section
2545 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
2546 entry->isym.st_name));
2548 dynstr = elf_hash_table (info)->dynstr;
2551 /* Create a strtab to hold the dynamic symbol names. */
2552 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
2557 dynstr_index = _bfd_elf_strtab_add (dynstr, name, false);
2558 if (dynstr_index == (unsigned long) -1)
2560 entry->isym.st_name = dynstr_index;
2562 eht = elf_hash_table (info);
2564 entry->next = eht->dynlocal;
2565 eht->dynlocal = entry;
2566 entry->input_bfd = input_bfd;
2567 entry->input_indx = input_indx;
2570 /* Whatever binding the symbol had before, it's now local. */
2572 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
2574 /* The dynindx will be set at the end of size_dynamic_sections. */
2579 /* Read and swap the relocs from the section indicated by SHDR. This
2580 may be either a REL or a RELA section. The relocations are
2581 translated into RELA relocations and stored in INTERNAL_RELOCS,
2582 which should have already been allocated to contain enough space.
2583 The EXTERNAL_RELOCS are a buffer where the external form of the
2584 relocations should be stored.
2586 Returns false if something goes wrong. */
2589 elf_link_read_relocs_from_section (abfd, shdr, external_relocs,
2592 Elf_Internal_Shdr *shdr;
2593 PTR external_relocs;
2594 Elf_Internal_Rela *internal_relocs;
2596 struct elf_backend_data *bed;
2599 /* If there aren't any relocations, that's OK. */
2603 /* Position ourselves at the start of the section. */
2604 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2607 /* Read the relocations. */
2608 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2611 bed = get_elf_backend_data (abfd);
2613 /* Convert the external relocations to the internal format. */
2614 if (shdr->sh_entsize == sizeof (Elf_External_Rel))
2616 Elf_External_Rel *erel;
2617 Elf_External_Rel *erelend;
2618 Elf_Internal_Rela *irela;
2619 Elf_Internal_Rel *irel;
2621 erel = (Elf_External_Rel *) external_relocs;
2622 erelend = erel + NUM_SHDR_ENTRIES (shdr);
2623 irela = internal_relocs;
2624 amt = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
2625 irel = bfd_alloc (abfd, amt);
2626 for (; erel < erelend; erel++, irela += bed->s->int_rels_per_ext_rel)
2630 if (bed->s->swap_reloc_in)
2631 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
2633 elf_swap_reloc_in (abfd, erel, irel);
2635 for (i = 0; i < bed->s->int_rels_per_ext_rel; ++i)
2637 irela[i].r_offset = irel[i].r_offset;
2638 irela[i].r_info = irel[i].r_info;
2639 irela[i].r_addend = 0;
2645 Elf_External_Rela *erela;
2646 Elf_External_Rela *erelaend;
2647 Elf_Internal_Rela *irela;
2649 BFD_ASSERT (shdr->sh_entsize == sizeof (Elf_External_Rela));
2651 erela = (Elf_External_Rela *) external_relocs;
2652 erelaend = erela + NUM_SHDR_ENTRIES (shdr);
2653 irela = internal_relocs;
2654 for (; erela < erelaend; erela++, irela += bed->s->int_rels_per_ext_rel)
2656 if (bed->s->swap_reloca_in)
2657 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
2659 elf_swap_reloca_in (abfd, erela, irela);
2666 /* Read and swap the relocs for a section O. They may have been
2667 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2668 not NULL, they are used as buffers to read into. They are known to
2669 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2670 the return value is allocated using either malloc or bfd_alloc,
2671 according to the KEEP_MEMORY argument. If O has two relocation
2672 sections (both REL and RELA relocations), then the REL_HDR
2673 relocations will appear first in INTERNAL_RELOCS, followed by the
2674 REL_HDR2 relocations. */
2677 NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
2681 PTR external_relocs;
2682 Elf_Internal_Rela *internal_relocs;
2683 boolean keep_memory;
2685 Elf_Internal_Shdr *rel_hdr;
2687 Elf_Internal_Rela *alloc2 = NULL;
2688 struct elf_backend_data *bed = get_elf_backend_data (abfd);
2690 if (elf_section_data (o)->relocs != NULL)
2691 return elf_section_data (o)->relocs;
2693 if (o->reloc_count == 0)
2696 rel_hdr = &elf_section_data (o)->rel_hdr;
2698 if (internal_relocs == NULL)
2702 size = o->reloc_count;
2703 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2705 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2707 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2708 if (internal_relocs == NULL)
2712 if (external_relocs == NULL)
2714 bfd_size_type size = rel_hdr->sh_size;
2716 if (elf_section_data (o)->rel_hdr2)
2717 size += elf_section_data (o)->rel_hdr2->sh_size;
2718 alloc1 = (PTR) bfd_malloc (size);
2721 external_relocs = alloc1;
2724 if (!elf_link_read_relocs_from_section (abfd, rel_hdr,
2728 if (!elf_link_read_relocs_from_section
2730 elf_section_data (o)->rel_hdr2,
2731 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2732 internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
2733 * bed->s->int_rels_per_ext_rel)))
2736 /* Cache the results for next time, if we can. */
2738 elf_section_data (o)->relocs = internal_relocs;
2743 /* Don't free alloc2, since if it was allocated we are passing it
2744 back (under the name of internal_relocs). */
2746 return internal_relocs;
2756 /* Record an assignment to a symbol made by a linker script. We need
2757 this in case some dynamic object refers to this symbol. */
2760 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
2761 bfd *output_bfd ATTRIBUTE_UNUSED;
2762 struct bfd_link_info *info;
2766 struct elf_link_hash_entry *h;
2768 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2771 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
2775 if (h->root.type == bfd_link_hash_new)
2776 h->elf_link_hash_flags &= ~ELF_LINK_NON_ELF;
2778 /* If this symbol is being provided by the linker script, and it is
2779 currently defined by a dynamic object, but not by a regular
2780 object, then mark it as undefined so that the generic linker will
2781 force the correct value. */
2783 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2784 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2785 h->root.type = bfd_link_hash_undefined;
2787 /* If this symbol is not being provided by the linker script, and it is
2788 currently defined by a dynamic object, but not by a regular object,
2789 then clear out any version information because the symbol will not be
2790 associated with the dynamic object any more. */
2792 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2793 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2794 h->verinfo.verdef = NULL;
2796 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2798 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2799 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
2801 && h->dynindx == -1)
2803 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2806 /* If this is a weak defined symbol, and we know a corresponding
2807 real symbol from the same dynamic object, make sure the real
2808 symbol is also made into a dynamic symbol. */
2809 if (h->weakdef != NULL
2810 && h->weakdef->dynindx == -1)
2812 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2820 /* This structure is used to pass information to
2821 elf_link_assign_sym_version. */
2823 struct elf_assign_sym_version_info
2827 /* General link information. */
2828 struct bfd_link_info *info;
2830 struct bfd_elf_version_tree *verdefs;
2831 /* Whether we had a failure. */
2835 /* This structure is used to pass information to
2836 elf_link_find_version_dependencies. */
2838 struct elf_find_verdep_info
2842 /* General link information. */
2843 struct bfd_link_info *info;
2844 /* The number of dependencies. */
2846 /* Whether we had a failure. */
2850 /* Array used to determine the number of hash table buckets to use
2851 based on the number of symbols there are. If there are fewer than
2852 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2853 fewer than 37 we use 17 buckets, and so forth. We never use more
2854 than 32771 buckets. */
2856 static const size_t elf_buckets[] =
2858 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2862 /* Compute bucket count for hashing table. We do not use a static set
2863 of possible tables sizes anymore. Instead we determine for all
2864 possible reasonable sizes of the table the outcome (i.e., the
2865 number of collisions etc) and choose the best solution. The
2866 weighting functions are not too simple to allow the table to grow
2867 without bounds. Instead one of the weighting factors is the size.
2868 Therefore the result is always a good payoff between few collisions
2869 (= short chain lengths) and table size. */
2871 compute_bucket_count (info)
2872 struct bfd_link_info *info;
2874 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
2875 size_t best_size = 0;
2876 unsigned long int *hashcodes;
2877 unsigned long int *hashcodesp;
2878 unsigned long int i;
2881 /* Compute the hash values for all exported symbols. At the same
2882 time store the values in an array so that we could use them for
2885 amt *= sizeof (unsigned long int);
2886 hashcodes = (unsigned long int *) bfd_malloc (amt);
2887 if (hashcodes == NULL)
2889 hashcodesp = hashcodes;
2891 /* Put all hash values in HASHCODES. */
2892 elf_link_hash_traverse (elf_hash_table (info),
2893 elf_collect_hash_codes, &hashcodesp);
2895 /* We have a problem here. The following code to optimize the table
2896 size requires an integer type with more the 32 bits. If
2897 BFD_HOST_U_64_BIT is set we know about such a type. */
2898 #ifdef BFD_HOST_U_64_BIT
2899 if (info->optimize == true)
2901 unsigned long int nsyms = hashcodesp - hashcodes;
2904 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
2905 unsigned long int *counts ;
2907 /* Possible optimization parameters: if we have NSYMS symbols we say
2908 that the hashing table must at least have NSYMS/4 and at most
2910 minsize = nsyms / 4;
2913 best_size = maxsize = nsyms * 2;
2915 /* Create array where we count the collisions in. We must use bfd_malloc
2916 since the size could be large. */
2918 amt *= sizeof (unsigned long int);
2919 counts = (unsigned long int *) bfd_malloc (amt);
2926 /* Compute the "optimal" size for the hash table. The criteria is a
2927 minimal chain length. The minor criteria is (of course) the size
2929 for (i = minsize; i < maxsize; ++i)
2931 /* Walk through the array of hashcodes and count the collisions. */
2932 BFD_HOST_U_64_BIT max;
2933 unsigned long int j;
2934 unsigned long int fact;
2936 memset (counts, '\0', i * sizeof (unsigned long int));
2938 /* Determine how often each hash bucket is used. */
2939 for (j = 0; j < nsyms; ++j)
2940 ++counts[hashcodes[j] % i];
2942 /* For the weight function we need some information about the
2943 pagesize on the target. This is information need not be 100%
2944 accurate. Since this information is not available (so far) we
2945 define it here to a reasonable default value. If it is crucial
2946 to have a better value some day simply define this value. */
2947 # ifndef BFD_TARGET_PAGESIZE
2948 # define BFD_TARGET_PAGESIZE (4096)
2951 /* We in any case need 2 + NSYMS entries for the size values and
2953 max = (2 + nsyms) * (ARCH_SIZE / 8);
2956 /* Variant 1: optimize for short chains. We add the squares
2957 of all the chain lengths (which favous many small chain
2958 over a few long chains). */
2959 for (j = 0; j < i; ++j)
2960 max += counts[j] * counts[j];
2962 /* This adds penalties for the overall size of the table. */
2963 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2966 /* Variant 2: Optimize a lot more for small table. Here we
2967 also add squares of the size but we also add penalties for
2968 empty slots (the +1 term). */
2969 for (j = 0; j < i; ++j)
2970 max += (1 + counts[j]) * (1 + counts[j]);
2972 /* The overall size of the table is considered, but not as
2973 strong as in variant 1, where it is squared. */
2974 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2978 /* Compare with current best results. */
2979 if (max < best_chlen)
2989 #endif /* defined (BFD_HOST_U_64_BIT) */
2991 /* This is the fallback solution if no 64bit type is available or if we
2992 are not supposed to spend much time on optimizations. We select the
2993 bucket count using a fixed set of numbers. */
2994 for (i = 0; elf_buckets[i] != 0; i++)
2996 best_size = elf_buckets[i];
2997 if (dynsymcount < elf_buckets[i + 1])
3002 /* Free the arrays we needed. */
3008 /* Set up the sizes and contents of the ELF dynamic sections. This is
3009 called by the ELF linker emulation before_allocation routine. We
3010 must set the sizes of the sections before the linker sets the
3011 addresses of the various sections. */
3014 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
3016 auxiliary_filters, info, sinterpptr,
3021 const char *filter_shlib;
3022 const char * const *auxiliary_filters;
3023 struct bfd_link_info *info;
3024 asection **sinterpptr;
3025 struct bfd_elf_version_tree *verdefs;
3027 bfd_size_type soname_indx;
3029 struct elf_backend_data *bed;
3030 struct elf_assign_sym_version_info asvinfo;
3034 soname_indx = (bfd_size_type) -1;
3036 if (info->hash->creator->flavour != bfd_target_elf_flavour)
3039 if (! is_elf_hash_table (info))
3042 /* Any syms created from now on start with -1 in
3043 got.refcount/offset and plt.refcount/offset. */
3044 elf_hash_table (info)->init_refcount = -1;
3046 /* The backend may have to create some sections regardless of whether
3047 we're dynamic or not. */
3048 bed = get_elf_backend_data (output_bfd);
3049 if (bed->elf_backend_always_size_sections
3050 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
3053 dynobj = elf_hash_table (info)->dynobj;
3055 /* If there were no dynamic objects in the link, there is nothing to
3060 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
3063 if (elf_hash_table (info)->dynamic_sections_created)
3065 struct elf_info_failed eif;
3066 struct elf_link_hash_entry *h;
3069 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
3070 BFD_ASSERT (*sinterpptr != NULL || info->shared);
3074 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3076 if (soname_indx == (bfd_size_type) -1
3077 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SONAME,
3084 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMBOLIC,
3087 info->flags |= DF_SYMBOLIC;
3094 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
3096 if (info->new_dtags)
3097 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
3098 if (indx == (bfd_size_type) -1
3099 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_RPATH, indx)
3101 && ! elf_add_dynamic_entry (info, (bfd_vma) DT_RUNPATH,
3106 if (filter_shlib != NULL)
3110 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3111 filter_shlib, true);
3112 if (indx == (bfd_size_type) -1
3113 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_FILTER, indx))
3117 if (auxiliary_filters != NULL)
3119 const char * const *p;
3121 for (p = auxiliary_filters; *p != NULL; p++)
3125 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3127 if (indx == (bfd_size_type) -1
3128 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_AUXILIARY,
3135 eif.verdefs = verdefs;
3138 /* If we are supposed to export all symbols into the dynamic symbol
3139 table (this is not the normal case), then do so. */
3140 if (info->export_dynamic)
3142 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
3148 /* Attach all the symbols to their version information. */
3149 asvinfo.output_bfd = output_bfd;
3150 asvinfo.info = info;
3151 asvinfo.verdefs = verdefs;
3152 asvinfo.failed = false;
3154 elf_link_hash_traverse (elf_hash_table (info),
3155 elf_link_assign_sym_version,
3160 /* Find all symbols which were defined in a dynamic object and make
3161 the backend pick a reasonable value for them. */
3162 elf_link_hash_traverse (elf_hash_table (info),
3163 elf_adjust_dynamic_symbol,
3168 /* Add some entries to the .dynamic section. We fill in some of the
3169 values later, in elf_bfd_final_link, but we must add the entries
3170 now so that we know the final size of the .dynamic section. */
3172 /* If there are initialization and/or finalization functions to
3173 call then add the corresponding DT_INIT/DT_FINI entries. */
3174 h = (info->init_function
3175 ? elf_link_hash_lookup (elf_hash_table (info),
3176 info->init_function, false,
3180 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3181 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3183 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_INIT, (bfd_vma) 0))
3186 h = (info->fini_function
3187 ? elf_link_hash_lookup (elf_hash_table (info),
3188 info->fini_function, false,
3192 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3193 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3195 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FINI, (bfd_vma) 0))
3199 if (bfd_get_section_by_name (output_bfd, ".preinit_array") != NULL)
3201 /* DT_PREINIT_ARRAY is not allowed in shared library. */
3207 for (sub = info->input_bfds; sub != NULL;
3208 sub = sub->link_next)
3209 for (o = sub->sections; o != NULL; o = o->next)
3210 if (elf_section_data (o)->this_hdr.sh_type
3211 == SHT_PREINIT_ARRAY)
3213 (*_bfd_error_handler)
3214 (_("%s: .preinit_array section is not allowed in DSO"),
3215 bfd_archive_filename (sub));
3219 bfd_set_error (bfd_error_nonrepresentable_section);
3223 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_PREINIT_ARRAY,
3225 || !elf_add_dynamic_entry (info, (bfd_vma) DT_PREINIT_ARRAYSZ,
3229 if (bfd_get_section_by_name (output_bfd, ".init_array") != NULL)
3231 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_INIT_ARRAY,
3233 || !elf_add_dynamic_entry (info, (bfd_vma) DT_INIT_ARRAYSZ,
3237 if (bfd_get_section_by_name (output_bfd, ".fini_array") != NULL)
3239 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_FINI_ARRAY,
3241 || !elf_add_dynamic_entry (info, (bfd_vma) DT_FINI_ARRAYSZ,
3246 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
3247 /* If .dynstr is excluded from the link, we don't want any of
3248 these tags. Strictly, we should be checking each section
3249 individually; This quick check covers for the case where
3250 someone does a /DISCARD/ : { *(*) }. */
3251 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
3253 bfd_size_type strsize;
3255 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
3256 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_HASH, (bfd_vma) 0)
3257 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_STRTAB, (bfd_vma) 0)
3258 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMTAB, (bfd_vma) 0)
3259 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_STRSZ, strsize)
3260 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMENT,
3261 (bfd_vma) sizeof (Elf_External_Sym)))
3266 /* The backend must work out the sizes of all the other dynamic
3268 if (bed->elf_backend_size_dynamic_sections
3269 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
3272 if (elf_hash_table (info)->dynamic_sections_created)
3274 bfd_size_type dynsymcount;
3276 size_t bucketcount = 0;
3277 size_t hash_entry_size;
3278 unsigned int dtagcount;
3280 /* Set up the version definition section. */
3281 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3282 BFD_ASSERT (s != NULL);
3284 /* We may have created additional version definitions if we are
3285 just linking a regular application. */
3286 verdefs = asvinfo.verdefs;
3288 /* Skip anonymous version tag. */
3289 if (verdefs != NULL && verdefs->vernum == 0)
3290 verdefs = verdefs->next;
3292 if (verdefs == NULL)
3293 _bfd_strip_section_from_output (info, s);
3298 struct bfd_elf_version_tree *t;
3300 Elf_Internal_Verdef def;
3301 Elf_Internal_Verdaux defaux;
3306 /* Make space for the base version. */
3307 size += sizeof (Elf_External_Verdef);
3308 size += sizeof (Elf_External_Verdaux);
3311 for (t = verdefs; t != NULL; t = t->next)
3313 struct bfd_elf_version_deps *n;
3315 size += sizeof (Elf_External_Verdef);
3316 size += sizeof (Elf_External_Verdaux);
3319 for (n = t->deps; n != NULL; n = n->next)
3320 size += sizeof (Elf_External_Verdaux);
3323 s->_raw_size = size;
3324 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3325 if (s->contents == NULL && s->_raw_size != 0)
3328 /* Fill in the version definition section. */
3332 def.vd_version = VER_DEF_CURRENT;
3333 def.vd_flags = VER_FLG_BASE;
3336 def.vd_aux = sizeof (Elf_External_Verdef);
3337 def.vd_next = (sizeof (Elf_External_Verdef)
3338 + sizeof (Elf_External_Verdaux));
3340 if (soname_indx != (bfd_size_type) -1)
3342 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3344 def.vd_hash = bfd_elf_hash (soname);
3345 defaux.vda_name = soname_indx;
3352 name = basename (output_bfd->filename);
3353 def.vd_hash = bfd_elf_hash (name);
3354 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3356 if (indx == (bfd_size_type) -1)
3358 defaux.vda_name = indx;
3360 defaux.vda_next = 0;
3362 _bfd_elf_swap_verdef_out (output_bfd, &def,
3363 (Elf_External_Verdef *) p);
3364 p += sizeof (Elf_External_Verdef);
3365 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3366 (Elf_External_Verdaux *) p);
3367 p += sizeof (Elf_External_Verdaux);
3369 for (t = verdefs; t != NULL; t = t->next)
3372 struct bfd_elf_version_deps *n;
3373 struct elf_link_hash_entry *h;
3376 for (n = t->deps; n != NULL; n = n->next)
3379 /* Add a symbol representing this version. */
3381 if (! (_bfd_generic_link_add_one_symbol
3382 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
3383 (bfd_vma) 0, (const char *) NULL, false,
3384 get_elf_backend_data (dynobj)->collect,
3385 (struct bfd_link_hash_entry **) &h)))
3387 h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
3388 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3389 h->type = STT_OBJECT;
3390 h->verinfo.vertree = t;
3392 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
3395 def.vd_version = VER_DEF_CURRENT;
3397 if (t->globals == NULL && t->locals == NULL && ! t->used)
3398 def.vd_flags |= VER_FLG_WEAK;
3399 def.vd_ndx = t->vernum + 1;
3400 def.vd_cnt = cdeps + 1;
3401 def.vd_hash = bfd_elf_hash (t->name);
3402 def.vd_aux = sizeof (Elf_External_Verdef);
3403 if (t->next != NULL)
3404 def.vd_next = (sizeof (Elf_External_Verdef)
3405 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
3409 _bfd_elf_swap_verdef_out (output_bfd, &def,
3410 (Elf_External_Verdef *) p);
3411 p += sizeof (Elf_External_Verdef);
3413 defaux.vda_name = h->dynstr_index;
3414 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3416 if (t->deps == NULL)
3417 defaux.vda_next = 0;
3419 defaux.vda_next = sizeof (Elf_External_Verdaux);
3420 t->name_indx = defaux.vda_name;
3422 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3423 (Elf_External_Verdaux *) p);
3424 p += sizeof (Elf_External_Verdaux);
3426 for (n = t->deps; n != NULL; n = n->next)
3428 if (n->version_needed == NULL)
3430 /* This can happen if there was an error in the
3432 defaux.vda_name = 0;
3436 defaux.vda_name = n->version_needed->name_indx;
3437 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3440 if (n->next == NULL)
3441 defaux.vda_next = 0;
3443 defaux.vda_next = sizeof (Elf_External_Verdaux);
3445 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3446 (Elf_External_Verdaux *) p);
3447 p += sizeof (Elf_External_Verdaux);
3451 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERDEF, (bfd_vma) 0)
3452 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_VERDEFNUM,
3456 elf_tdata (output_bfd)->cverdefs = cdefs;
3459 if (info->new_dtags && info->flags)
3461 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FLAGS, info->flags))
3468 info->flags_1 &= ~ (DF_1_INITFIRST
3471 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FLAGS_1,
3476 /* Work out the size of the version reference section. */
3478 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3479 BFD_ASSERT (s != NULL);
3481 struct elf_find_verdep_info sinfo;
3483 sinfo.output_bfd = output_bfd;
3485 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
3486 if (sinfo.vers == 0)
3488 sinfo.failed = false;
3490 elf_link_hash_traverse (elf_hash_table (info),
3491 elf_link_find_version_dependencies,
3494 if (elf_tdata (output_bfd)->verref == NULL)
3495 _bfd_strip_section_from_output (info, s);
3498 Elf_Internal_Verneed *t;
3503 /* Build the version definition section. */
3506 for (t = elf_tdata (output_bfd)->verref;
3510 Elf_Internal_Vernaux *a;
3512 size += sizeof (Elf_External_Verneed);
3514 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3515 size += sizeof (Elf_External_Vernaux);
3518 s->_raw_size = size;
3519 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3520 if (s->contents == NULL)
3524 for (t = elf_tdata (output_bfd)->verref;
3529 Elf_Internal_Vernaux *a;
3533 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3536 t->vn_version = VER_NEED_CURRENT;
3538 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3539 elf_dt_name (t->vn_bfd) != NULL
3540 ? elf_dt_name (t->vn_bfd)
3541 : basename (t->vn_bfd->filename),
3543 if (indx == (bfd_size_type) -1)
3546 t->vn_aux = sizeof (Elf_External_Verneed);
3547 if (t->vn_nextref == NULL)
3550 t->vn_next = (sizeof (Elf_External_Verneed)
3551 + caux * sizeof (Elf_External_Vernaux));
3553 _bfd_elf_swap_verneed_out (output_bfd, t,
3554 (Elf_External_Verneed *) p);
3555 p += sizeof (Elf_External_Verneed);
3557 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3559 a->vna_hash = bfd_elf_hash (a->vna_nodename);
3560 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3561 a->vna_nodename, false);
3562 if (indx == (bfd_size_type) -1)
3565 if (a->vna_nextptr == NULL)
3568 a->vna_next = sizeof (Elf_External_Vernaux);
3570 _bfd_elf_swap_vernaux_out (output_bfd, a,
3571 (Elf_External_Vernaux *) p);
3572 p += sizeof (Elf_External_Vernaux);
3576 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERNEED,
3578 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_VERNEEDNUM,
3582 elf_tdata (output_bfd)->cverrefs = crefs;
3586 /* Assign dynsym indicies. In a shared library we generate a
3587 section symbol for each output section, which come first.
3588 Next come all of the back-end allocated local dynamic syms,
3589 followed by the rest of the global symbols. */
3591 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3593 /* Work out the size of the symbol version section. */
3594 s = bfd_get_section_by_name (dynobj, ".gnu.version");
3595 BFD_ASSERT (s != NULL);
3596 if (dynsymcount == 0
3597 || (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
3599 _bfd_strip_section_from_output (info, s);
3600 /* The DYNSYMCOUNT might have changed if we were going to
3601 output a dynamic symbol table entry for S. */
3602 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3606 s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
3607 s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3608 if (s->contents == NULL)
3611 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERSYM, (bfd_vma) 0))
3615 /* Set the size of the .dynsym and .hash sections. We counted
3616 the number of dynamic symbols in elf_link_add_object_symbols.
3617 We will build the contents of .dynsym and .hash when we build
3618 the final symbol table, because until then we do not know the
3619 correct value to give the symbols. We built the .dynstr
3620 section as we went along in elf_link_add_object_symbols. */
3621 s = bfd_get_section_by_name (dynobj, ".dynsym");
3622 BFD_ASSERT (s != NULL);
3623 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
3624 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3625 if (s->contents == NULL && s->_raw_size != 0)
3628 if (dynsymcount != 0)
3630 Elf_Internal_Sym isym;
3632 /* The first entry in .dynsym is a dummy symbol. */
3639 elf_swap_symbol_out (output_bfd, &isym, (PTR) s->contents, (PTR) 0);
3642 /* Compute the size of the hashing table. As a side effect this
3643 computes the hash values for all the names we export. */
3644 bucketcount = compute_bucket_count (info);
3646 s = bfd_get_section_by_name (dynobj, ".hash");
3647 BFD_ASSERT (s != NULL);
3648 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
3649 s->_raw_size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
3650 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3651 if (s->contents == NULL)
3653 memset (s->contents, 0, (size_t) s->_raw_size);
3655 bfd_put (8 * hash_entry_size, output_bfd, (bfd_vma) bucketcount,
3657 bfd_put (8 * hash_entry_size, output_bfd, (bfd_vma) dynsymcount,
3658 s->contents + hash_entry_size);
3660 elf_hash_table (info)->bucketcount = bucketcount;
3662 s = bfd_get_section_by_name (dynobj, ".dynstr");
3663 BFD_ASSERT (s != NULL);
3665 elf_finalize_dynstr (output_bfd, info);
3667 s->_raw_size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
3669 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
3670 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NULL, (bfd_vma) 0))
3677 /* This function is used to adjust offsets into .dynstr for
3678 dynamic symbols. This is called via elf_link_hash_traverse. */
3680 static boolean elf_adjust_dynstr_offsets
3681 PARAMS ((struct elf_link_hash_entry *, PTR));
3684 elf_adjust_dynstr_offsets (h, data)
3685 struct elf_link_hash_entry *h;
3688 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3690 if (h->root.type == bfd_link_hash_warning)
3691 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3693 if (h->dynindx != -1)
3694 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3698 /* Assign string offsets in .dynstr, update all structures referencing
3702 elf_finalize_dynstr (output_bfd, info)
3704 struct bfd_link_info *info;
3706 struct elf_link_local_dynamic_entry *entry;
3707 struct elf_strtab_hash *dynstr = elf_hash_table (info)->dynstr;
3708 bfd *dynobj = elf_hash_table (info)->dynobj;
3711 Elf_External_Dyn *dyncon, *dynconend;
3713 _bfd_elf_strtab_finalize (dynstr);
3714 size = _bfd_elf_strtab_size (dynstr);
3716 /* Update all .dynamic entries referencing .dynstr strings. */
3717 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3718 BFD_ASSERT (sdyn != NULL);
3720 dyncon = (Elf_External_Dyn *) sdyn->contents;
3721 dynconend = (Elf_External_Dyn *) (sdyn->contents +
3723 for (; dyncon < dynconend; dyncon++)
3725 Elf_Internal_Dyn dyn;
3727 elf_swap_dyn_in (dynobj, dyncon, & dyn);
3731 dyn.d_un.d_val = size;
3732 elf_swap_dyn_out (dynobj, & dyn, dyncon);
3740 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3741 elf_swap_dyn_out (dynobj, & dyn, dyncon);
3748 /* Now update local dynamic symbols. */
3749 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
3750 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3751 entry->isym.st_name);
3753 /* And the rest of dynamic symbols. */
3754 elf_link_hash_traverse (elf_hash_table (info),
3755 elf_adjust_dynstr_offsets, dynstr);
3757 /* Adjust version definitions. */
3758 if (elf_tdata (output_bfd)->cverdefs)
3763 Elf_Internal_Verdef def;
3764 Elf_Internal_Verdaux defaux;
3766 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3767 p = (bfd_byte *) s->contents;
3770 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3772 p += sizeof (Elf_External_Verdef);
3773 for (i = 0; i < def.vd_cnt; ++i)
3775 _bfd_elf_swap_verdaux_in (output_bfd,
3776 (Elf_External_Verdaux *) p, &defaux);
3777 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3779 _bfd_elf_swap_verdaux_out (output_bfd,
3780 &defaux, (Elf_External_Verdaux *) p);
3781 p += sizeof (Elf_External_Verdaux);
3784 while (def.vd_next);
3787 /* Adjust version references. */
3788 if (elf_tdata (output_bfd)->verref)
3793 Elf_Internal_Verneed need;
3794 Elf_Internal_Vernaux needaux;
3796 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3797 p = (bfd_byte *) s->contents;
3800 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3802 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3803 _bfd_elf_swap_verneed_out (output_bfd, &need,
3804 (Elf_External_Verneed *) p);
3805 p += sizeof (Elf_External_Verneed);
3806 for (i = 0; i < need.vn_cnt; ++i)
3808 _bfd_elf_swap_vernaux_in (output_bfd,
3809 (Elf_External_Vernaux *) p, &needaux);
3810 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3812 _bfd_elf_swap_vernaux_out (output_bfd,
3814 (Elf_External_Vernaux *) p);
3815 p += sizeof (Elf_External_Vernaux);
3818 while (need.vn_next);
3824 /* Fix up the flags for a symbol. This handles various cases which
3825 can only be fixed after all the input files are seen. This is
3826 currently called by both adjust_dynamic_symbol and
3827 assign_sym_version, which is unnecessary but perhaps more robust in
3828 the face of future changes. */
3831 elf_fix_symbol_flags (h, eif)
3832 struct elf_link_hash_entry *h;
3833 struct elf_info_failed *eif;
3835 /* If this symbol was mentioned in a non-ELF file, try to set
3836 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3837 permit a non-ELF file to correctly refer to a symbol defined in
3838 an ELF dynamic object. */
3839 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
3841 while (h->root.type == bfd_link_hash_indirect)
3842 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3844 if (h->root.type != bfd_link_hash_defined
3845 && h->root.type != bfd_link_hash_defweak)
3846 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3847 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3850 if (h->root.u.def.section->owner != NULL
3851 && (bfd_get_flavour (h->root.u.def.section->owner)
3852 == bfd_target_elf_flavour))
3853 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3854 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3856 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3859 if (h->dynindx == -1
3860 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3861 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
3863 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3872 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3873 was first seen in a non-ELF file. Fortunately, if the symbol
3874 was first seen in an ELF file, we're probably OK unless the
3875 symbol was defined in a non-ELF file. Catch that case here.
3876 FIXME: We're still in trouble if the symbol was first seen in
3877 a dynamic object, and then later in a non-ELF regular object. */
3878 if ((h->root.type == bfd_link_hash_defined
3879 || h->root.type == bfd_link_hash_defweak)
3880 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3881 && (h->root.u.def.section->owner != NULL
3882 ? (bfd_get_flavour (h->root.u.def.section->owner)
3883 != bfd_target_elf_flavour)
3884 : (bfd_is_abs_section (h->root.u.def.section)
3885 && (h->elf_link_hash_flags
3886 & ELF_LINK_HASH_DEF_DYNAMIC) == 0)))
3887 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3890 /* If this is a final link, and the symbol was defined as a common
3891 symbol in a regular object file, and there was no definition in
3892 any dynamic object, then the linker will have allocated space for
3893 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3894 flag will not have been set. */
3895 if (h->root.type == bfd_link_hash_defined
3896 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3897 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
3898 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3899 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
3900 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3902 /* If -Bsymbolic was used (which means to bind references to global
3903 symbols to the definition within the shared object), and this
3904 symbol was defined in a regular object, then it actually doesn't
3905 need a PLT entry, and we can accomplish that by forcing it local.
3906 Likewise, if the symbol has hidden or internal visibility.
3907 FIXME: It might be that we also do not need a PLT for other
3908 non-hidden visibilities, but we would have to tell that to the
3909 backend specifically; we can't just clear PLT-related data here. */
3910 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
3911 && eif->info->shared
3912 && is_elf_hash_table (eif->info)
3913 && (eif->info->symbolic
3914 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3915 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
3916 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3918 struct elf_backend_data *bed;
3919 boolean force_local;
3921 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3923 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3924 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
3925 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
3928 /* If this is a weak defined symbol in a dynamic object, and we know
3929 the real definition in the dynamic object, copy interesting flags
3930 over to the real definition. */
3931 if (h->weakdef != NULL)
3933 struct elf_link_hash_entry *weakdef;
3935 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3936 || h->root.type == bfd_link_hash_defweak);
3937 weakdef = h->weakdef;
3938 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
3939 || weakdef->root.type == bfd_link_hash_defweak);
3940 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
3942 /* If the real definition is defined by a regular object file,
3943 don't do anything special. See the longer description in
3944 elf_adjust_dynamic_symbol, below. */
3945 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3949 struct elf_backend_data *bed;
3951 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3952 (*bed->elf_backend_copy_indirect_symbol) (weakdef, h);
3959 /* Make the backend pick a good value for a dynamic symbol. This is
3960 called via elf_link_hash_traverse, and also calls itself
3964 elf_adjust_dynamic_symbol (h, data)
3965 struct elf_link_hash_entry *h;
3968 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3970 struct elf_backend_data *bed;
3972 if (h->root.type == bfd_link_hash_warning)
3974 h->plt.offset = (bfd_vma) -1;
3975 h->got.offset = (bfd_vma) -1;
3977 /* When warning symbols are created, they **replace** the "real"
3978 entry in the hash table, thus we never get to see the real
3979 symbol in a hash traversal. So look at it now. */
3980 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3983 /* Ignore indirect symbols. These are added by the versioning code. */
3984 if (h->root.type == bfd_link_hash_indirect)
3987 if (! is_elf_hash_table (eif->info))
3990 /* Fix the symbol flags. */
3991 if (! elf_fix_symbol_flags (h, eif))
3994 /* If this symbol does not require a PLT entry, and it is not
3995 defined by a dynamic object, or is not referenced by a regular
3996 object, ignore it. We do have to handle a weak defined symbol,
3997 even if no regular object refers to it, if we decided to add it
3998 to the dynamic symbol table. FIXME: Do we normally need to worry
3999 about symbols which are defined by one dynamic object and
4000 referenced by another one? */
4001 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
4002 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
4003 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
4004 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
4005 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
4007 h->plt.offset = (bfd_vma) -1;
4011 /* If we've already adjusted this symbol, don't do it again. This
4012 can happen via a recursive call. */
4013 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
4016 /* Don't look at this symbol again. Note that we must set this
4017 after checking the above conditions, because we may look at a
4018 symbol once, decide not to do anything, and then get called
4019 recursively later after REF_REGULAR is set below. */
4020 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
4022 /* If this is a weak definition, and we know a real definition, and
4023 the real symbol is not itself defined by a regular object file,
4024 then get a good value for the real definition. We handle the
4025 real symbol first, for the convenience of the backend routine.
4027 Note that there is a confusing case here. If the real definition
4028 is defined by a regular object file, we don't get the real symbol
4029 from the dynamic object, but we do get the weak symbol. If the
4030 processor backend uses a COPY reloc, then if some routine in the
4031 dynamic object changes the real symbol, we will not see that
4032 change in the corresponding weak symbol. This is the way other
4033 ELF linkers work as well, and seems to be a result of the shared
4036 I will clarify this issue. Most SVR4 shared libraries define the
4037 variable _timezone and define timezone as a weak synonym. The
4038 tzset call changes _timezone. If you write
4039 extern int timezone;
4041 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
4042 you might expect that, since timezone is a synonym for _timezone,
4043 the same number will print both times. However, if the processor
4044 backend uses a COPY reloc, then actually timezone will be copied
4045 into your process image, and, since you define _timezone
4046 yourself, _timezone will not. Thus timezone and _timezone will
4047 wind up at different memory locations. The tzset call will set
4048 _timezone, leaving timezone unchanged. */
4050 if (h->weakdef != NULL)
4052 /* If we get to this point, we know there is an implicit
4053 reference by a regular object file via the weak symbol H.
4054 FIXME: Is this really true? What if the traversal finds
4055 H->WEAKDEF before it finds H? */
4056 h->weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
4058 if (! elf_adjust_dynamic_symbol (h->weakdef, (PTR) eif))
4062 /* If a symbol has no type and no size and does not require a PLT
4063 entry, then we are probably about to do the wrong thing here: we
4064 are probably going to create a COPY reloc for an empty object.
4065 This case can arise when a shared object is built with assembly
4066 code, and the assembly code fails to set the symbol type. */
4068 && h->type == STT_NOTYPE
4069 && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0)
4070 (*_bfd_error_handler)
4071 (_("warning: type and size of dynamic symbol `%s' are not defined"),
4072 h->root.root.string);
4074 dynobj = elf_hash_table (eif->info)->dynobj;
4075 bed = get_elf_backend_data (dynobj);
4076 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
4085 /* This routine is used to export all defined symbols into the dynamic
4086 symbol table. It is called via elf_link_hash_traverse. */
4089 elf_export_symbol (h, data)
4090 struct elf_link_hash_entry *h;
4093 struct elf_info_failed *eif = (struct elf_info_failed *) data;
4095 /* Ignore indirect symbols. These are added by the versioning code. */
4096 if (h->root.type == bfd_link_hash_indirect)
4099 if (h->root.type == bfd_link_hash_warning)
4100 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4102 if (h->dynindx == -1
4103 && (h->elf_link_hash_flags
4104 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
4106 struct bfd_elf_version_tree *t;
4107 struct bfd_elf_version_expr *d;
4109 for (t = eif->verdefs; t != NULL; t = t->next)
4111 if (t->globals != NULL)
4113 for (d = t->globals; d != NULL; d = d->next)
4115 if ((*d->match) (d, h->root.root.string))
4120 if (t->locals != NULL)
4122 for (d = t->locals ; d != NULL; d = d->next)
4124 if ((*d->match) (d, h->root.root.string))
4133 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
4144 /* Look through the symbols which are defined in other shared
4145 libraries and referenced here. Update the list of version
4146 dependencies. This will be put into the .gnu.version_r section.
4147 This function is called via elf_link_hash_traverse. */
4150 elf_link_find_version_dependencies (h, data)
4151 struct elf_link_hash_entry *h;
4154 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
4155 Elf_Internal_Verneed *t;
4156 Elf_Internal_Vernaux *a;
4159 if (h->root.type == bfd_link_hash_warning)
4160 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4162 /* We only care about symbols defined in shared objects with version
4164 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
4165 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
4167 || h->verinfo.verdef == NULL)
4170 /* See if we already know about this version. */
4171 for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
4173 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
4176 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4177 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
4183 /* This is a new version. Add it to tree we are building. */
4188 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, amt);
4191 rinfo->failed = true;
4195 t->vn_bfd = h->verinfo.verdef->vd_bfd;
4196 t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
4197 elf_tdata (rinfo->output_bfd)->verref = t;
4201 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, amt);
4203 /* Note that we are copying a string pointer here, and testing it
4204 above. If bfd_elf_string_from_elf_section is ever changed to
4205 discard the string data when low in memory, this will have to be
4207 a->vna_nodename = h->verinfo.verdef->vd_nodename;
4209 a->vna_flags = h->verinfo.verdef->vd_flags;
4210 a->vna_nextptr = t->vn_auxptr;
4212 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
4215 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
4222 /* Figure out appropriate versions for all the symbols. We may not
4223 have the version number script until we have read all of the input
4224 files, so until that point we don't know which symbols should be
4225 local. This function is called via elf_link_hash_traverse. */
4228 elf_link_assign_sym_version (h, data)
4229 struct elf_link_hash_entry *h;
4232 struct elf_assign_sym_version_info *sinfo;
4233 struct bfd_link_info *info;
4234 struct elf_backend_data *bed;
4235 struct elf_info_failed eif;
4239 sinfo = (struct elf_assign_sym_version_info *) data;
4242 if (h->root.type == bfd_link_hash_warning)
4243 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4245 /* Fix the symbol flags. */
4248 if (! elf_fix_symbol_flags (h, &eif))
4251 sinfo->failed = true;
4255 /* We only need version numbers for symbols defined in regular
4257 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
4260 bed = get_elf_backend_data (sinfo->output_bfd);
4261 p = strchr (h->root.root.string, ELF_VER_CHR);
4262 if (p != NULL && h->verinfo.vertree == NULL)
4264 struct bfd_elf_version_tree *t;
4269 /* There are two consecutive ELF_VER_CHR characters if this is
4270 not a hidden symbol. */
4272 if (*p == ELF_VER_CHR)
4278 /* If there is no version string, we can just return out. */
4282 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
4286 /* Look for the version. If we find it, it is no longer weak. */
4287 for (t = sinfo->verdefs; t != NULL; t = t->next)
4289 if (strcmp (t->name, p) == 0)
4293 struct bfd_elf_version_expr *d;
4295 len = p - h->root.root.string;
4296 alc = bfd_malloc ((bfd_size_type) len);
4299 strncpy (alc, h->root.root.string, len - 1);
4300 alc[len - 1] = '\0';
4301 if (alc[len - 2] == ELF_VER_CHR)
4302 alc[len - 2] = '\0';
4304 h->verinfo.vertree = t;
4308 if (t->globals != NULL)
4310 for (d = t->globals; d != NULL; d = d->next)
4311 if ((*d->match) (d, alc))
4315 /* See if there is anything to force this symbol to
4317 if (d == NULL && t->locals != NULL)
4319 for (d = t->locals; d != NULL; d = d->next)
4321 if ((*d->match) (d, alc))
4323 if (h->dynindx != -1
4325 && ! info->export_dynamic)
4327 (*bed->elf_backend_hide_symbol) (info, h, true);
4340 /* If we are building an application, we need to create a
4341 version node for this version. */
4342 if (t == NULL && ! info->shared)
4344 struct bfd_elf_version_tree **pp;
4347 /* If we aren't going to export this symbol, we don't need
4348 to worry about it. */
4349 if (h->dynindx == -1)
4353 t = ((struct bfd_elf_version_tree *)
4354 bfd_alloc (sinfo->output_bfd, amt));
4357 sinfo->failed = true;
4366 t->name_indx = (unsigned int) -1;
4370 /* Don't count anonymous version tag. */
4371 if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0)
4373 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
4375 t->vernum = version_index;
4379 h->verinfo.vertree = t;
4383 /* We could not find the version for a symbol when
4384 generating a shared archive. Return an error. */
4385 (*_bfd_error_handler)
4386 (_("%s: undefined versioned symbol name %s"),
4387 bfd_get_filename (sinfo->output_bfd), h->root.root.string);
4388 bfd_set_error (bfd_error_bad_value);
4389 sinfo->failed = true;
4394 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
4397 /* If we don't have a version for this symbol, see if we can find
4399 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
4401 struct bfd_elf_version_tree *t;
4402 struct bfd_elf_version_tree *deflt;
4403 struct bfd_elf_version_expr *d;
4405 /* See if can find what version this symbol is in. If the
4406 symbol is supposed to be local, then don't actually register
4409 for (t = sinfo->verdefs; t != NULL; t = t->next)
4411 if (t->globals != NULL)
4413 for (d = t->globals; d != NULL; d = d->next)
4415 if ((*d->match) (d, h->root.root.string))
4417 h->verinfo.vertree = t;
4426 if (t->locals != NULL)
4428 for (d = t->locals; d != NULL; d = d->next)
4430 if (d->pattern[0] == '*' && d->pattern[1] == '\0')
4432 else if ((*d->match) (d, h->root.root.string))
4434 h->verinfo.vertree = t;
4435 if (h->dynindx != -1
4437 && ! info->export_dynamic)
4439 (*bed->elf_backend_hide_symbol) (info, h, true);
4450 if (deflt != NULL && h->verinfo.vertree == NULL)
4452 h->verinfo.vertree = deflt;
4453 if (h->dynindx != -1
4455 && ! info->export_dynamic)
4457 (*bed->elf_backend_hide_symbol) (info, h, true);
4465 /* Final phase of ELF linker. */
4467 /* A structure we use to avoid passing large numbers of arguments. */
4469 struct elf_final_link_info
4471 /* General link information. */
4472 struct bfd_link_info *info;
4475 /* Symbol string table. */
4476 struct bfd_strtab_hash *symstrtab;
4477 /* .dynsym section. */
4478 asection *dynsym_sec;
4479 /* .hash section. */
4481 /* symbol version section (.gnu.version). */
4482 asection *symver_sec;
4483 /* Buffer large enough to hold contents of any section. */
4485 /* Buffer large enough to hold external relocs of any section. */
4486 PTR external_relocs;
4487 /* Buffer large enough to hold internal relocs of any section. */
4488 Elf_Internal_Rela *internal_relocs;
4489 /* Buffer large enough to hold external local symbols of any input
4491 Elf_External_Sym *external_syms;
4492 /* And a buffer for symbol section indices. */
4493 Elf_External_Sym_Shndx *locsym_shndx;
4494 /* Buffer large enough to hold internal local symbols of any input
4496 Elf_Internal_Sym *internal_syms;
4497 /* Array large enough to hold a symbol index for each local symbol
4498 of any input BFD. */
4500 /* Array large enough to hold a section pointer for each local
4501 symbol of any input BFD. */
4502 asection **sections;
4503 /* Buffer to hold swapped out symbols. */
4504 Elf_External_Sym *symbuf;
4505 /* And one for symbol section indices. */
4506 Elf_External_Sym_Shndx *symshndxbuf;
4507 /* Number of swapped out symbols in buffer. */
4508 size_t symbuf_count;
4509 /* Number of symbols which fit in symbuf. */
4513 static boolean elf_link_output_sym
4514 PARAMS ((struct elf_final_link_info *, const char *,
4515 Elf_Internal_Sym *, asection *));
4516 static boolean elf_link_flush_output_syms
4517 PARAMS ((struct elf_final_link_info *));
4518 static boolean elf_link_output_extsym
4519 PARAMS ((struct elf_link_hash_entry *, PTR));
4520 static boolean elf_link_sec_merge_syms
4521 PARAMS ((struct elf_link_hash_entry *, PTR));
4522 static boolean elf_link_input_bfd
4523 PARAMS ((struct elf_final_link_info *, bfd *));
4524 static boolean elf_reloc_link_order
4525 PARAMS ((bfd *, struct bfd_link_info *, asection *,
4526 struct bfd_link_order *));
4528 /* This struct is used to pass information to elf_link_output_extsym. */
4530 struct elf_outext_info
4534 struct elf_final_link_info *finfo;
4537 /* Compute the size of, and allocate space for, REL_HDR which is the
4538 section header for a section containing relocations for O. */
4541 elf_link_size_reloc_section (abfd, rel_hdr, o)
4543 Elf_Internal_Shdr *rel_hdr;
4546 bfd_size_type reloc_count;
4547 bfd_size_type num_rel_hashes;
4549 /* Figure out how many relocations there will be. */
4550 if (rel_hdr == &elf_section_data (o)->rel_hdr)
4551 reloc_count = elf_section_data (o)->rel_count;
4553 reloc_count = elf_section_data (o)->rel_count2;
4555 num_rel_hashes = o->reloc_count;
4556 if (num_rel_hashes < reloc_count)
4557 num_rel_hashes = reloc_count;
4559 /* That allows us to calculate the size of the section. */
4560 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
4562 /* The contents field must last into write_object_contents, so we
4563 allocate it with bfd_alloc rather than malloc. Also since we
4564 cannot be sure that the contents will actually be filled in,
4565 we zero the allocated space. */
4566 rel_hdr->contents = (PTR) bfd_zalloc (abfd, rel_hdr->sh_size);
4567 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
4570 /* We only allocate one set of hash entries, so we only do it the
4571 first time we are called. */
4572 if (elf_section_data (o)->rel_hashes == NULL
4575 struct elf_link_hash_entry **p;
4577 p = ((struct elf_link_hash_entry **)
4578 bfd_zmalloc (num_rel_hashes
4579 * sizeof (struct elf_link_hash_entry *)));
4583 elf_section_data (o)->rel_hashes = p;
4589 /* When performing a relocateable link, the input relocations are
4590 preserved. But, if they reference global symbols, the indices
4591 referenced must be updated. Update all the relocations in
4592 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4595 elf_link_adjust_relocs (abfd, rel_hdr, count, rel_hash)
4597 Elf_Internal_Shdr *rel_hdr;
4599 struct elf_link_hash_entry **rel_hash;
4602 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4603 Elf_Internal_Rel *irel;
4604 Elf_Internal_Rela *irela;
4605 bfd_size_type amt = sizeof (Elf_Internal_Rel) * bed->s->int_rels_per_ext_rel;
4607 irel = (Elf_Internal_Rel *) bfd_zmalloc (amt);
4610 (*_bfd_error_handler) (_("Error: out of memory"));
4614 amt = sizeof (Elf_Internal_Rela) * bed->s->int_rels_per_ext_rel;
4615 irela = (Elf_Internal_Rela *) bfd_zmalloc (amt);
4618 (*_bfd_error_handler) (_("Error: out of memory"));
4622 for (i = 0; i < count; i++, rel_hash++)
4624 if (*rel_hash == NULL)
4627 BFD_ASSERT ((*rel_hash)->indx >= 0);
4629 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
4631 Elf_External_Rel *erel;
4634 erel = (Elf_External_Rel *) rel_hdr->contents + i;
4635 if (bed->s->swap_reloc_in)
4636 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
4638 elf_swap_reloc_in (abfd, erel, irel);
4640 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4641 irel[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4642 ELF_R_TYPE (irel[j].r_info));
4644 if (bed->s->swap_reloc_out)
4645 (*bed->s->swap_reloc_out) (abfd, irel, (bfd_byte *) erel);
4647 elf_swap_reloc_out (abfd, irel, erel);
4651 Elf_External_Rela *erela;
4654 BFD_ASSERT (rel_hdr->sh_entsize
4655 == sizeof (Elf_External_Rela));
4657 erela = (Elf_External_Rela *) rel_hdr->contents + i;
4658 if (bed->s->swap_reloca_in)
4659 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
4661 elf_swap_reloca_in (abfd, erela, irela);
4663 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4664 irela[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4665 ELF_R_TYPE (irela[j].r_info));
4667 if (bed->s->swap_reloca_out)
4668 (*bed->s->swap_reloca_out) (abfd, irela, (bfd_byte *) erela);
4670 elf_swap_reloca_out (abfd, irela, erela);
4678 struct elf_link_sort_rela {
4680 enum elf_reloc_type_class type;
4682 Elf_Internal_Rel rel;
4683 Elf_Internal_Rela rela;
4688 elf_link_sort_cmp1 (A, B)
4692 struct elf_link_sort_rela *a = (struct elf_link_sort_rela *) A;
4693 struct elf_link_sort_rela *b = (struct elf_link_sort_rela *) B;
4694 int relativea, relativeb;
4696 relativea = a->type == reloc_class_relative;
4697 relativeb = b->type == reloc_class_relative;
4699 if (relativea < relativeb)
4701 if (relativea > relativeb)
4703 if (ELF_R_SYM (a->u.rel.r_info) < ELF_R_SYM (b->u.rel.r_info))
4705 if (ELF_R_SYM (a->u.rel.r_info) > ELF_R_SYM (b->u.rel.r_info))
4707 if (a->u.rel.r_offset < b->u.rel.r_offset)
4709 if (a->u.rel.r_offset > b->u.rel.r_offset)
4715 elf_link_sort_cmp2 (A, B)
4719 struct elf_link_sort_rela *a = (struct elf_link_sort_rela *) A;
4720 struct elf_link_sort_rela *b = (struct elf_link_sort_rela *) B;
4723 if (a->offset < b->offset)
4725 if (a->offset > b->offset)
4727 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
4728 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
4733 if (a->u.rel.r_offset < b->u.rel.r_offset)
4735 if (a->u.rel.r_offset > b->u.rel.r_offset)
4741 elf_link_sort_relocs (abfd, info, psec)
4743 struct bfd_link_info *info;
4746 bfd *dynobj = elf_hash_table (info)->dynobj;
4747 asection *reldyn, *o;
4748 boolean rel = false;
4749 bfd_size_type count, size;
4751 struct elf_link_sort_rela *rela;
4752 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4754 reldyn = bfd_get_section_by_name (abfd, ".rela.dyn");
4755 if (reldyn == NULL || reldyn->_raw_size == 0)
4757 reldyn = bfd_get_section_by_name (abfd, ".rel.dyn");
4758 if (reldyn == NULL || reldyn->_raw_size == 0)
4761 count = reldyn->_raw_size / sizeof (Elf_External_Rel);
4764 count = reldyn->_raw_size / sizeof (Elf_External_Rela);
4767 for (o = dynobj->sections; o != NULL; o = o->next)
4768 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4769 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4770 && o->output_section == reldyn)
4771 size += o->_raw_size;
4773 if (size != reldyn->_raw_size)
4776 rela = (struct elf_link_sort_rela *) bfd_zmalloc (sizeof (*rela) * count);
4779 (*info->callbacks->warning)
4780 (info, _("Not enough memory to sort relocations"), 0, abfd, 0,
4785 for (o = dynobj->sections; o != NULL; o = o->next)
4786 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4787 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4788 && o->output_section == reldyn)
4792 Elf_External_Rel *erel, *erelend;
4793 struct elf_link_sort_rela *s;
4795 erel = (Elf_External_Rel *) o->contents;
4796 erelend = (Elf_External_Rel *) (o->contents + o->_raw_size);
4797 s = rela + o->output_offset / sizeof (Elf_External_Rel);
4798 for (; erel < erelend; erel++, s++)
4800 if (bed->s->swap_reloc_in)
4801 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, &s->u.rel);
4803 elf_swap_reloc_in (abfd, erel, &s->u.rel);
4805 s->type = (*bed->elf_backend_reloc_type_class) (&s->u.rela);
4810 Elf_External_Rela *erela, *erelaend;
4811 struct elf_link_sort_rela *s;
4813 erela = (Elf_External_Rela *) o->contents;
4814 erelaend = (Elf_External_Rela *) (o->contents + o->_raw_size);
4815 s = rela + o->output_offset / sizeof (Elf_External_Rela);
4816 for (; erela < erelaend; erela++, s++)
4818 if (bed->s->swap_reloca_in)
4819 (*bed->s->swap_reloca_in) (dynobj, (bfd_byte *) erela,
4822 elf_swap_reloca_in (dynobj, erela, &s->u.rela);
4824 s->type = (*bed->elf_backend_reloc_type_class) (&s->u.rela);
4829 qsort (rela, (size_t) count, sizeof (*rela), elf_link_sort_cmp1);
4830 for (ret = 0; ret < count && rela[ret].type == reloc_class_relative; ret++)
4832 for (i = ret, j = ret; i < count; i++)
4834 if (ELF_R_SYM (rela[i].u.rel.r_info) != ELF_R_SYM (rela[j].u.rel.r_info))
4836 rela[i].offset = rela[j].u.rel.r_offset;
4838 qsort (rela + ret, (size_t) count - ret, sizeof (*rela), elf_link_sort_cmp2);
4840 for (o = dynobj->sections; o != NULL; o = o->next)
4841 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4842 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4843 && o->output_section == reldyn)
4847 Elf_External_Rel *erel, *erelend;
4848 struct elf_link_sort_rela *s;
4850 erel = (Elf_External_Rel *) o->contents;
4851 erelend = (Elf_External_Rel *) (o->contents + o->_raw_size);
4852 s = rela + o->output_offset / sizeof (Elf_External_Rel);
4853 for (; erel < erelend; erel++, s++)
4855 if (bed->s->swap_reloc_out)
4856 (*bed->s->swap_reloc_out) (abfd, &s->u.rel,
4859 elf_swap_reloc_out (abfd, &s->u.rel, erel);
4864 Elf_External_Rela *erela, *erelaend;
4865 struct elf_link_sort_rela *s;
4867 erela = (Elf_External_Rela *) o->contents;
4868 erelaend = (Elf_External_Rela *) (o->contents + o->_raw_size);
4869 s = rela + o->output_offset / sizeof (Elf_External_Rela);
4870 for (; erela < erelaend; erela++, s++)
4872 if (bed->s->swap_reloca_out)
4873 (*bed->s->swap_reloca_out) (dynobj, &s->u.rela,
4874 (bfd_byte *) erela);
4876 elf_swap_reloca_out (dynobj, &s->u.rela, erela);
4886 /* Do the final step of an ELF link. */
4889 elf_bfd_final_link (abfd, info)
4891 struct bfd_link_info *info;
4894 boolean emit_relocs;
4896 struct elf_final_link_info finfo;
4897 register asection *o;
4898 register struct bfd_link_order *p;
4900 bfd_size_type max_contents_size;
4901 bfd_size_type max_external_reloc_size;
4902 bfd_size_type max_internal_reloc_count;
4903 bfd_size_type max_sym_count;
4904 bfd_size_type max_sym_shndx_count;
4906 Elf_Internal_Sym elfsym;
4908 Elf_Internal_Shdr *symtab_hdr;
4909 Elf_Internal_Shdr *symstrtab_hdr;
4910 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4911 struct elf_outext_info eoinfo;
4913 size_t relativecount = 0;
4914 asection *reldyn = 0;
4917 if (! is_elf_hash_table (info))
4921 abfd->flags |= DYNAMIC;
4923 dynamic = elf_hash_table (info)->dynamic_sections_created;
4924 dynobj = elf_hash_table (info)->dynobj;
4926 emit_relocs = (info->relocateable
4927 || info->emitrelocations
4928 || bed->elf_backend_emit_relocs);
4931 finfo.output_bfd = abfd;
4932 finfo.symstrtab = elf_stringtab_init ();
4933 if (finfo.symstrtab == NULL)
4938 finfo.dynsym_sec = NULL;
4939 finfo.hash_sec = NULL;
4940 finfo.symver_sec = NULL;
4944 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
4945 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
4946 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
4947 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
4948 /* Note that it is OK if symver_sec is NULL. */
4951 finfo.contents = NULL;
4952 finfo.external_relocs = NULL;
4953 finfo.internal_relocs = NULL;
4954 finfo.external_syms = NULL;
4955 finfo.locsym_shndx = NULL;
4956 finfo.internal_syms = NULL;
4957 finfo.indices = NULL;
4958 finfo.sections = NULL;
4959 finfo.symbuf = NULL;
4960 finfo.symshndxbuf = NULL;
4961 finfo.symbuf_count = 0;
4963 /* Count up the number of relocations we will output for each output
4964 section, so that we know the sizes of the reloc sections. We
4965 also figure out some maximum sizes. */
4966 max_contents_size = 0;
4967 max_external_reloc_size = 0;
4968 max_internal_reloc_count = 0;
4970 max_sym_shndx_count = 0;
4972 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4976 for (p = o->link_order_head; p != NULL; p = p->next)
4978 if (p->type == bfd_section_reloc_link_order
4979 || p->type == bfd_symbol_reloc_link_order)
4981 else if (p->type == bfd_indirect_link_order)
4985 sec = p->u.indirect.section;
4987 /* Mark all sections which are to be included in the
4988 link. This will normally be every section. We need
4989 to do this so that we can identify any sections which
4990 the linker has decided to not include. */
4991 sec->linker_mark = true;
4993 if (sec->flags & SEC_MERGE)
4996 if (info->relocateable || info->emitrelocations)
4997 o->reloc_count += sec->reloc_count;
4998 else if (bed->elf_backend_count_relocs)
5000 Elf_Internal_Rela * relocs;
5002 relocs = (NAME(_bfd_elf,link_read_relocs)
5003 (abfd, sec, (PTR) NULL,
5004 (Elf_Internal_Rela *) NULL, info->keep_memory));
5007 += (*bed->elf_backend_count_relocs) (sec, relocs);
5009 if (!info->keep_memory)
5013 if (sec->_raw_size > max_contents_size)
5014 max_contents_size = sec->_raw_size;
5015 if (sec->_cooked_size > max_contents_size)
5016 max_contents_size = sec->_cooked_size;
5018 /* We are interested in just local symbols, not all
5020 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
5021 && (sec->owner->flags & DYNAMIC) == 0)
5025 if (elf_bad_symtab (sec->owner))
5026 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
5027 / sizeof (Elf_External_Sym));
5029 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
5031 if (sym_count > max_sym_count)
5032 max_sym_count = sym_count;
5034 if (sym_count > max_sym_shndx_count
5035 && elf_symtab_shndx (sec->owner) != 0)
5036 max_sym_shndx_count = sym_count;
5038 if ((sec->flags & SEC_RELOC) != 0)
5042 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
5043 if (ext_size > max_external_reloc_size)
5044 max_external_reloc_size = ext_size;
5045 if (sec->reloc_count > max_internal_reloc_count)
5046 max_internal_reloc_count = sec->reloc_count;
5052 if (o->reloc_count > 0)
5053 o->flags |= SEC_RELOC;
5056 /* Explicitly clear the SEC_RELOC flag. The linker tends to
5057 set it (this is probably a bug) and if it is set
5058 assign_section_numbers will create a reloc section. */
5059 o->flags &=~ SEC_RELOC;
5062 /* If the SEC_ALLOC flag is not set, force the section VMA to
5063 zero. This is done in elf_fake_sections as well, but forcing
5064 the VMA to 0 here will ensure that relocs against these
5065 sections are handled correctly. */
5066 if ((o->flags & SEC_ALLOC) == 0
5067 && ! o->user_set_vma)
5071 if (! info->relocateable && merged)
5072 elf_link_hash_traverse (elf_hash_table (info),
5073 elf_link_sec_merge_syms, (PTR) abfd);
5075 /* Figure out the file positions for everything but the symbol table
5076 and the relocs. We set symcount to force assign_section_numbers
5077 to create a symbol table. */
5078 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
5079 BFD_ASSERT (! abfd->output_has_begun);
5080 if (! _bfd_elf_compute_section_file_positions (abfd, info))
5083 /* Figure out how many relocations we will have in each section.
5084 Just using RELOC_COUNT isn't good enough since that doesn't
5085 maintain a separate value for REL vs. RELA relocations. */
5087 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
5088 for (o = sub->sections; o != NULL; o = o->next)
5090 asection *output_section;
5092 if (! o->linker_mark)
5094 /* This section was omitted from the link. */
5098 output_section = o->output_section;
5100 if (output_section != NULL
5101 && (o->flags & SEC_RELOC) != 0)
5103 struct bfd_elf_section_data *esdi
5104 = elf_section_data (o);
5105 struct bfd_elf_section_data *esdo
5106 = elf_section_data (output_section);
5107 unsigned int *rel_count;
5108 unsigned int *rel_count2;
5109 bfd_size_type entsize;
5110 bfd_size_type entsize2;
5112 /* We must be careful to add the relocations from the
5113 input section to the right output count. */
5114 entsize = esdi->rel_hdr.sh_entsize;
5115 entsize2 = esdi->rel_hdr2 ? esdi->rel_hdr2->sh_entsize : 0;
5116 BFD_ASSERT ((entsize == sizeof (Elf_External_Rel)
5117 || entsize == sizeof (Elf_External_Rela))
5118 && entsize2 != entsize
5120 || entsize2 == sizeof (Elf_External_Rel)
5121 || entsize2 == sizeof (Elf_External_Rela)));
5122 if (entsize == esdo->rel_hdr.sh_entsize)
5124 rel_count = &esdo->rel_count;
5125 rel_count2 = &esdo->rel_count2;
5129 rel_count = &esdo->rel_count2;
5130 rel_count2 = &esdo->rel_count;
5133 *rel_count += NUM_SHDR_ENTRIES (& esdi->rel_hdr);
5135 *rel_count2 += NUM_SHDR_ENTRIES (esdi->rel_hdr2);
5136 output_section->flags |= SEC_RELOC;
5140 /* That created the reloc sections. Set their sizes, and assign
5141 them file positions, and allocate some buffers. */
5142 for (o = abfd->sections; o != NULL; o = o->next)
5144 if ((o->flags & SEC_RELOC) != 0)
5146 if (!elf_link_size_reloc_section (abfd,
5147 &elf_section_data (o)->rel_hdr,
5151 if (elf_section_data (o)->rel_hdr2
5152 && !elf_link_size_reloc_section (abfd,
5153 elf_section_data (o)->rel_hdr2,
5158 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
5159 to count upwards while actually outputting the relocations. */
5160 elf_section_data (o)->rel_count = 0;
5161 elf_section_data (o)->rel_count2 = 0;
5164 _bfd_elf_assign_file_positions_for_relocs (abfd);
5166 /* We have now assigned file positions for all the sections except
5167 .symtab and .strtab. We start the .symtab section at the current
5168 file position, and write directly to it. We build the .strtab
5169 section in memory. */
5170 bfd_get_symcount (abfd) = 0;
5171 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
5172 /* sh_name is set in prep_headers. */
5173 symtab_hdr->sh_type = SHT_SYMTAB;
5174 symtab_hdr->sh_flags = 0;
5175 symtab_hdr->sh_addr = 0;
5176 symtab_hdr->sh_size = 0;
5177 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
5178 /* sh_link is set in assign_section_numbers. */
5179 /* sh_info is set below. */
5180 /* sh_offset is set just below. */
5181 symtab_hdr->sh_addralign = bed->s->file_align;
5183 off = elf_tdata (abfd)->next_file_pos;
5184 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
5186 /* Note that at this point elf_tdata (abfd)->next_file_pos is
5187 incorrect. We do not yet know the size of the .symtab section.
5188 We correct next_file_pos below, after we do know the size. */
5190 /* Allocate a buffer to hold swapped out symbols. This is to avoid
5191 continuously seeking to the right position in the file. */
5192 if (! info->keep_memory || max_sym_count < 20)
5193 finfo.symbuf_size = 20;
5195 finfo.symbuf_size = max_sym_count;
5196 amt = finfo.symbuf_size;
5197 amt *= sizeof (Elf_External_Sym);
5198 finfo.symbuf = (Elf_External_Sym *) bfd_malloc (amt);
5199 if (finfo.symbuf == NULL)
5201 if (elf_numsections (abfd) > SHN_LORESERVE)
5203 amt = finfo.symbuf_size;
5204 amt *= sizeof (Elf_External_Sym_Shndx);
5205 finfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
5206 if (finfo.symshndxbuf == NULL)
5210 /* Start writing out the symbol table. The first symbol is always a
5212 if (info->strip != strip_all
5215 elfsym.st_value = 0;
5218 elfsym.st_other = 0;
5219 elfsym.st_shndx = SHN_UNDEF;
5220 if (! elf_link_output_sym (&finfo, (const char *) NULL,
5221 &elfsym, bfd_und_section_ptr))
5226 /* Some standard ELF linkers do this, but we don't because it causes
5227 bootstrap comparison failures. */
5228 /* Output a file symbol for the output file as the second symbol.
5229 We output this even if we are discarding local symbols, although
5230 I'm not sure if this is correct. */
5231 elfsym.st_value = 0;
5233 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
5234 elfsym.st_other = 0;
5235 elfsym.st_shndx = SHN_ABS;
5236 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
5237 &elfsym, bfd_abs_section_ptr))
5241 /* Output a symbol for each section. We output these even if we are
5242 discarding local symbols, since they are used for relocs. These
5243 symbols have no names. We store the index of each one in the
5244 index field of the section, so that we can find it again when
5245 outputting relocs. */
5246 if (info->strip != strip_all
5250 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
5251 elfsym.st_other = 0;
5252 for (i = 1; i < elf_numsections (abfd); i++)
5254 o = section_from_elf_index (abfd, i);
5256 o->target_index = bfd_get_symcount (abfd);
5257 elfsym.st_shndx = i;
5258 if (info->relocateable || o == NULL)
5259 elfsym.st_value = 0;
5261 elfsym.st_value = o->vma;
5262 if (! elf_link_output_sym (&finfo, (const char *) NULL,
5265 if (i == SHN_LORESERVE)
5266 i += SHN_HIRESERVE + 1 - SHN_LORESERVE;
5270 /* Allocate some memory to hold information read in from the input
5272 if (max_contents_size != 0)
5274 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
5275 if (finfo.contents == NULL)
5279 if (max_external_reloc_size != 0)
5281 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
5282 if (finfo.external_relocs == NULL)
5286 if (max_internal_reloc_count != 0)
5288 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
5289 amt *= sizeof (Elf_Internal_Rela);
5290 finfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
5291 if (finfo.internal_relocs == NULL)
5295 if (max_sym_count != 0)
5297 amt = max_sym_count * sizeof (Elf_External_Sym);
5298 finfo.external_syms = (Elf_External_Sym *) bfd_malloc (amt);
5299 if (finfo.external_syms == NULL)
5302 amt = max_sym_count * sizeof (Elf_Internal_Sym);
5303 finfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
5304 if (finfo.internal_syms == NULL)
5307 amt = max_sym_count * sizeof (long);
5308 finfo.indices = (long *) bfd_malloc (amt);
5309 if (finfo.indices == NULL)
5312 amt = max_sym_count * sizeof (asection *);
5313 finfo.sections = (asection **) bfd_malloc (amt);
5314 if (finfo.sections == NULL)
5318 if (max_sym_shndx_count != 0)
5320 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
5321 finfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
5322 if (finfo.locsym_shndx == NULL)
5326 /* Since ELF permits relocations to be against local symbols, we
5327 must have the local symbols available when we do the relocations.
5328 Since we would rather only read the local symbols once, and we
5329 would rather not keep them in memory, we handle all the
5330 relocations for a single input file at the same time.
5332 Unfortunately, there is no way to know the total number of local
5333 symbols until we have seen all of them, and the local symbol
5334 indices precede the global symbol indices. This means that when
5335 we are generating relocateable output, and we see a reloc against
5336 a global symbol, we can not know the symbol index until we have
5337 finished examining all the local symbols to see which ones we are
5338 going to output. To deal with this, we keep the relocations in
5339 memory, and don't output them until the end of the link. This is
5340 an unfortunate waste of memory, but I don't see a good way around
5341 it. Fortunately, it only happens when performing a relocateable
5342 link, which is not the common case. FIXME: If keep_memory is set
5343 we could write the relocs out and then read them again; I don't
5344 know how bad the memory loss will be. */
5346 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
5347 sub->output_has_begun = false;
5348 for (o = abfd->sections; o != NULL; o = o->next)
5350 for (p = o->link_order_head; p != NULL; p = p->next)
5352 if (p->type == bfd_indirect_link_order
5353 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
5354 == bfd_target_elf_flavour)
5355 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
5357 if (! sub->output_has_begun)
5359 if (! elf_link_input_bfd (&finfo, sub))
5361 sub->output_has_begun = true;
5364 else if (p->type == bfd_section_reloc_link_order
5365 || p->type == bfd_symbol_reloc_link_order)
5367 if (! elf_reloc_link_order (abfd, info, o, p))
5372 if (! _bfd_default_link_order (abfd, info, o, p))
5378 /* Output any global symbols that got converted to local in a
5379 version script or due to symbol visibility. We do this in a
5380 separate step since ELF requires all local symbols to appear
5381 prior to any global symbols. FIXME: We should only do this if
5382 some global symbols were, in fact, converted to become local.
5383 FIXME: Will this work correctly with the Irix 5 linker? */
5384 eoinfo.failed = false;
5385 eoinfo.finfo = &finfo;
5386 eoinfo.localsyms = true;
5387 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
5392 /* That wrote out all the local symbols. Finish up the symbol table
5393 with the global symbols. Even if we want to strip everything we
5394 can, we still need to deal with those global symbols that got
5395 converted to local in a version script. */
5397 /* The sh_info field records the index of the first non local symbol. */
5398 symtab_hdr->sh_info = bfd_get_symcount (abfd);
5401 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
5403 Elf_Internal_Sym sym;
5404 Elf_External_Sym *dynsym =
5405 (Elf_External_Sym *) finfo.dynsym_sec->contents;
5406 long last_local = 0;
5408 /* Write out the section symbols for the output sections. */
5415 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
5418 for (s = abfd->sections; s != NULL; s = s->next)
5421 Elf_External_Sym *dest;
5423 indx = elf_section_data (s)->this_idx;
5424 BFD_ASSERT (indx > 0);
5425 sym.st_shndx = indx;
5426 sym.st_value = s->vma;
5427 dest = dynsym + elf_section_data (s)->dynindx;
5428 elf_swap_symbol_out (abfd, &sym, (PTR) dest, (PTR) 0);
5431 last_local = bfd_count_sections (abfd);
5434 /* Write out the local dynsyms. */
5435 if (elf_hash_table (info)->dynlocal)
5437 struct elf_link_local_dynamic_entry *e;
5438 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
5441 Elf_External_Sym *dest;
5443 sym.st_size = e->isym.st_size;
5444 sym.st_other = e->isym.st_other;
5446 /* Copy the internal symbol as is.
5447 Note that we saved a word of storage and overwrote
5448 the original st_name with the dynstr_index. */
5451 if (e->isym.st_shndx != SHN_UNDEF
5452 && (e->isym.st_shndx < SHN_LORESERVE
5453 || e->isym.st_shndx > SHN_HIRESERVE))
5455 s = bfd_section_from_elf_index (e->input_bfd,
5459 elf_section_data (s->output_section)->this_idx;
5460 sym.st_value = (s->output_section->vma
5462 + e->isym.st_value);
5465 if (last_local < e->dynindx)
5466 last_local = e->dynindx;
5468 dest = dynsym + e->dynindx;
5469 elf_swap_symbol_out (abfd, &sym, (PTR) dest, (PTR) 0);
5473 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
5477 /* We get the global symbols from the hash table. */
5478 eoinfo.failed = false;
5479 eoinfo.localsyms = false;
5480 eoinfo.finfo = &finfo;
5481 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
5486 /* If backend needs to output some symbols not present in the hash
5487 table, do it now. */
5488 if (bed->elf_backend_output_arch_syms)
5490 typedef boolean (*out_sym_func) PARAMS ((PTR, const char *,
5494 if (! ((*bed->elf_backend_output_arch_syms)
5495 (abfd, info, (PTR) &finfo, (out_sym_func) elf_link_output_sym)))
5499 /* Flush all symbols to the file. */
5500 if (! elf_link_flush_output_syms (&finfo))
5503 /* Now we know the size of the symtab section. */
5504 off += symtab_hdr->sh_size;
5506 /* Finish up and write out the symbol string table (.strtab)
5508 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
5509 /* sh_name was set in prep_headers. */
5510 symstrtab_hdr->sh_type = SHT_STRTAB;
5511 symstrtab_hdr->sh_flags = 0;
5512 symstrtab_hdr->sh_addr = 0;
5513 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
5514 symstrtab_hdr->sh_entsize = 0;
5515 symstrtab_hdr->sh_link = 0;
5516 symstrtab_hdr->sh_info = 0;
5517 /* sh_offset is set just below. */
5518 symstrtab_hdr->sh_addralign = 1;
5520 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
5521 elf_tdata (abfd)->next_file_pos = off;
5523 if (bfd_get_symcount (abfd) > 0)
5525 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
5526 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
5530 /* Adjust the relocs to have the correct symbol indices. */
5531 for (o = abfd->sections; o != NULL; o = o->next)
5533 if ((o->flags & SEC_RELOC) == 0)
5536 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
5537 elf_section_data (o)->rel_count,
5538 elf_section_data (o)->rel_hashes);
5539 if (elf_section_data (o)->rel_hdr2 != NULL)
5540 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
5541 elf_section_data (o)->rel_count2,
5542 (elf_section_data (o)->rel_hashes
5543 + elf_section_data (o)->rel_count));
5545 /* Set the reloc_count field to 0 to prevent write_relocs from
5546 trying to swap the relocs out itself. */
5550 if (dynamic && info->combreloc && dynobj != NULL)
5551 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
5553 /* If we are linking against a dynamic object, or generating a
5554 shared library, finish up the dynamic linking information. */
5557 Elf_External_Dyn *dyncon, *dynconend;
5559 /* Fix up .dynamic entries. */
5560 o = bfd_get_section_by_name (dynobj, ".dynamic");
5561 BFD_ASSERT (o != NULL);
5563 dyncon = (Elf_External_Dyn *) o->contents;
5564 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
5565 for (; dyncon < dynconend; dyncon++)
5567 Elf_Internal_Dyn dyn;
5571 elf_swap_dyn_in (dynobj, dyncon, &dyn);
5578 if (relativecount > 0 && dyncon + 1 < dynconend)
5580 switch (elf_section_data (reldyn)->this_hdr.sh_type)
5582 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
5583 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
5586 if (dyn.d_tag != DT_NULL)
5588 dyn.d_un.d_val = relativecount;
5589 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5595 name = info->init_function;
5598 name = info->fini_function;
5601 struct elf_link_hash_entry *h;
5603 h = elf_link_hash_lookup (elf_hash_table (info), name,
5604 false, false, true);
5606 && (h->root.type == bfd_link_hash_defined
5607 || h->root.type == bfd_link_hash_defweak))
5609 dyn.d_un.d_val = h->root.u.def.value;
5610 o = h->root.u.def.section;
5611 if (o->output_section != NULL)
5612 dyn.d_un.d_val += (o->output_section->vma
5613 + o->output_offset);
5616 /* The symbol is imported from another shared
5617 library and does not apply to this one. */
5621 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5626 case DT_PREINIT_ARRAYSZ:
5627 name = ".preinit_array";
5629 case DT_INIT_ARRAYSZ:
5630 name = ".init_array";
5632 case DT_FINI_ARRAYSZ:
5633 name = ".fini_array";
5635 o = bfd_get_section_by_name (abfd, name);
5636 BFD_ASSERT (o != NULL);
5637 if (o->_raw_size == 0)
5638 (*_bfd_error_handler)
5639 (_("warning: %s section has zero size"), name);
5640 dyn.d_un.d_val = o->_raw_size;
5641 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5644 case DT_PREINIT_ARRAY:
5645 name = ".preinit_array";
5648 name = ".init_array";
5651 name = ".fini_array";
5664 name = ".gnu.version_d";
5667 name = ".gnu.version_r";
5670 name = ".gnu.version";
5672 o = bfd_get_section_by_name (abfd, name);
5673 BFD_ASSERT (o != NULL);
5674 dyn.d_un.d_ptr = o->vma;
5675 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5682 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
5687 for (i = 1; i < elf_numsections (abfd); i++)
5689 Elf_Internal_Shdr *hdr;
5691 hdr = elf_elfsections (abfd)[i];
5692 if (hdr->sh_type == type
5693 && (hdr->sh_flags & SHF_ALLOC) != 0)
5695 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
5696 dyn.d_un.d_val += hdr->sh_size;
5699 if (dyn.d_un.d_val == 0
5700 || hdr->sh_addr < dyn.d_un.d_val)
5701 dyn.d_un.d_val = hdr->sh_addr;
5705 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5711 /* If we have created any dynamic sections, then output them. */
5714 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
5717 for (o = dynobj->sections; o != NULL; o = o->next)
5719 if ((o->flags & SEC_HAS_CONTENTS) == 0
5720 || o->_raw_size == 0
5721 || o->output_section == bfd_abs_section_ptr)
5723 if ((o->flags & SEC_LINKER_CREATED) == 0)
5725 /* At this point, we are only interested in sections
5726 created by elf_link_create_dynamic_sections. */
5729 if ((elf_section_data (o->output_section)->this_hdr.sh_type
5731 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
5733 if (! bfd_set_section_contents (abfd, o->output_section,
5735 (file_ptr) o->output_offset,
5741 /* The contents of the .dynstr section are actually in a
5743 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
5744 if (bfd_seek (abfd, off, SEEK_SET) != 0
5745 || ! _bfd_elf_strtab_emit (abfd,
5746 elf_hash_table (info)->dynstr))
5752 /* If we have optimized stabs strings, output them. */
5753 if (elf_hash_table (info)->stab_info != NULL)
5755 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
5759 if (info->eh_frame_hdr && elf_hash_table (info)->dynobj)
5761 o = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
5764 && (elf_section_data (o)->sec_info_type
5765 == ELF_INFO_TYPE_EH_FRAME_HDR))
5767 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, o))
5772 if (finfo.symstrtab != NULL)
5773 _bfd_stringtab_free (finfo.symstrtab);
5774 if (finfo.contents != NULL)
5775 free (finfo.contents);
5776 if (finfo.external_relocs != NULL)
5777 free (finfo.external_relocs);
5778 if (finfo.internal_relocs != NULL)
5779 free (finfo.internal_relocs);
5780 if (finfo.external_syms != NULL)
5781 free (finfo.external_syms);
5782 if (finfo.locsym_shndx != NULL)
5783 free (finfo.locsym_shndx);
5784 if (finfo.internal_syms != NULL)
5785 free (finfo.internal_syms);
5786 if (finfo.indices != NULL)
5787 free (finfo.indices);
5788 if (finfo.sections != NULL)
5789 free (finfo.sections);
5790 if (finfo.symbuf != NULL)
5791 free (finfo.symbuf);
5792 if (finfo.symshndxbuf != NULL)
5793 free (finfo.symbuf);
5794 for (o = abfd->sections; o != NULL; o = o->next)
5796 if ((o->flags & SEC_RELOC) != 0
5797 && elf_section_data (o)->rel_hashes != NULL)
5798 free (elf_section_data (o)->rel_hashes);
5801 elf_tdata (abfd)->linker = true;
5806 if (finfo.symstrtab != NULL)
5807 _bfd_stringtab_free (finfo.symstrtab);
5808 if (finfo.contents != NULL)
5809 free (finfo.contents);
5810 if (finfo.external_relocs != NULL)
5811 free (finfo.external_relocs);
5812 if (finfo.internal_relocs != NULL)
5813 free (finfo.internal_relocs);
5814 if (finfo.external_syms != NULL)
5815 free (finfo.external_syms);
5816 if (finfo.locsym_shndx != NULL)
5817 free (finfo.locsym_shndx);
5818 if (finfo.internal_syms != NULL)
5819 free (finfo.internal_syms);
5820 if (finfo.indices != NULL)
5821 free (finfo.indices);
5822 if (finfo.sections != NULL)
5823 free (finfo.sections);
5824 if (finfo.symbuf != NULL)
5825 free (finfo.symbuf);
5826 if (finfo.symshndxbuf != NULL)
5827 free (finfo.symbuf);
5828 for (o = abfd->sections; o != NULL; o = o->next)
5830 if ((o->flags & SEC_RELOC) != 0
5831 && elf_section_data (o)->rel_hashes != NULL)
5832 free (elf_section_data (o)->rel_hashes);
5838 /* Add a symbol to the output symbol table. */
5841 elf_link_output_sym (finfo, name, elfsym, input_sec)
5842 struct elf_final_link_info *finfo;
5844 Elf_Internal_Sym *elfsym;
5845 asection *input_sec;
5847 Elf_External_Sym *dest;
5848 Elf_External_Sym_Shndx *destshndx;
5850 boolean (*output_symbol_hook) PARAMS ((bfd *,
5851 struct bfd_link_info *info,
5856 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
5857 elf_backend_link_output_symbol_hook;
5858 if (output_symbol_hook != NULL)
5860 if (! ((*output_symbol_hook)
5861 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
5865 if (name == (const char *) NULL || *name == '\0')
5866 elfsym->st_name = 0;
5867 else if (input_sec->flags & SEC_EXCLUDE)
5868 elfsym->st_name = 0;
5871 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
5873 if (elfsym->st_name == (unsigned long) -1)
5877 if (finfo->symbuf_count >= finfo->symbuf_size)
5879 if (! elf_link_flush_output_syms (finfo))
5883 dest = finfo->symbuf + finfo->symbuf_count;
5884 destshndx = finfo->symshndxbuf;
5885 if (destshndx != NULL)
5886 destshndx += finfo->symbuf_count;
5887 elf_swap_symbol_out (finfo->output_bfd, elfsym, (PTR) dest, (PTR) destshndx);
5888 ++finfo->symbuf_count;
5890 ++ bfd_get_symcount (finfo->output_bfd);
5895 /* Flush the output symbols to the file. */
5898 elf_link_flush_output_syms (finfo)
5899 struct elf_final_link_info *finfo;
5901 if (finfo->symbuf_count > 0)
5903 Elf_Internal_Shdr *hdr;
5907 hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
5908 pos = hdr->sh_offset + hdr->sh_size;
5909 amt = finfo->symbuf_count * sizeof (Elf_External_Sym);
5910 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
5911 || bfd_bwrite ((PTR) finfo->symbuf, amt, finfo->output_bfd) != amt)
5914 hdr->sh_size += amt;
5916 if (finfo->symshndxbuf != NULL)
5918 hdr = &elf_tdata (finfo->output_bfd)->symtab_shndx_hdr;
5919 pos = hdr->sh_offset + hdr->sh_size;
5920 amt = finfo->symbuf_count * sizeof (Elf_External_Sym_Shndx);
5921 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
5922 || (bfd_bwrite ((PTR) finfo->symshndxbuf, amt, finfo->output_bfd)
5926 hdr->sh_size += amt;
5929 finfo->symbuf_count = 0;
5935 /* Adjust all external symbols pointing into SEC_MERGE sections
5936 to reflect the object merging within the sections. */
5939 elf_link_sec_merge_syms (h, data)
5940 struct elf_link_hash_entry *h;
5945 if (h->root.type == bfd_link_hash_warning)
5946 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5948 if ((h->root.type == bfd_link_hash_defined
5949 || h->root.type == bfd_link_hash_defweak)
5950 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
5951 && elf_section_data (sec)->sec_info_type == ELF_INFO_TYPE_MERGE)
5953 bfd *output_bfd = (bfd *) data;
5955 h->root.u.def.value =
5956 _bfd_merged_section_offset (output_bfd,
5957 &h->root.u.def.section,
5958 elf_section_data (sec)->sec_info,
5959 h->root.u.def.value, (bfd_vma) 0);
5965 /* Add an external symbol to the symbol table. This is called from
5966 the hash table traversal routine. When generating a shared object,
5967 we go through the symbol table twice. The first time we output
5968 anything that might have been forced to local scope in a version
5969 script. The second time we output the symbols that are still
5973 elf_link_output_extsym (h, data)
5974 struct elf_link_hash_entry *h;
5977 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
5978 struct elf_final_link_info *finfo = eoinfo->finfo;
5980 Elf_Internal_Sym sym;
5981 asection *input_sec;
5983 if (h->root.type == bfd_link_hash_warning)
5985 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5986 if (h->root.type == bfd_link_hash_new)
5990 /* Decide whether to output this symbol in this pass. */
5991 if (eoinfo->localsyms)
5993 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5998 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6002 /* If we are not creating a shared library, and this symbol is
6003 referenced by a shared library but is not defined anywhere, then
6004 warn that it is undefined. If we do not do this, the runtime
6005 linker will complain that the symbol is undefined when the
6006 program is run. We don't have to worry about symbols that are
6007 referenced by regular files, because we will already have issued
6008 warnings for them. */
6009 if (! finfo->info->relocateable
6010 && ! finfo->info->allow_shlib_undefined
6011 && ! finfo->info->shared
6012 && h->root.type == bfd_link_hash_undefined
6013 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
6014 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
6016 if (! ((*finfo->info->callbacks->undefined_symbol)
6017 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
6018 (asection *) NULL, (bfd_vma) 0, true)))
6020 eoinfo->failed = true;
6025 /* We don't want to output symbols that have never been mentioned by
6026 a regular file, or that we have been told to strip. However, if
6027 h->indx is set to -2, the symbol is used by a reloc and we must
6031 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
6032 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
6033 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
6034 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
6036 else if (finfo->info->strip == strip_all
6037 || (finfo->info->strip == strip_some
6038 && bfd_hash_lookup (finfo->info->keep_hash,
6039 h->root.root.string,
6040 false, false) == NULL))
6045 /* If we're stripping it, and it's not a dynamic symbol, there's
6046 nothing else to do unless it is a forced local symbol. */
6049 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6053 sym.st_size = h->size;
6054 sym.st_other = h->other;
6055 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6056 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
6057 else if (h->root.type == bfd_link_hash_undefweak
6058 || h->root.type == bfd_link_hash_defweak)
6059 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
6061 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
6063 switch (h->root.type)
6066 case bfd_link_hash_new:
6067 case bfd_link_hash_warning:
6071 case bfd_link_hash_undefined:
6072 case bfd_link_hash_undefweak:
6073 input_sec = bfd_und_section_ptr;
6074 sym.st_shndx = SHN_UNDEF;
6077 case bfd_link_hash_defined:
6078 case bfd_link_hash_defweak:
6080 input_sec = h->root.u.def.section;
6081 if (input_sec->output_section != NULL)
6084 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
6085 input_sec->output_section);
6086 if (sym.st_shndx == SHN_BAD)
6088 (*_bfd_error_handler)
6089 (_("%s: could not find output section %s for input section %s"),
6090 bfd_get_filename (finfo->output_bfd),
6091 input_sec->output_section->name,
6093 eoinfo->failed = true;
6097 /* ELF symbols in relocateable files are section relative,
6098 but in nonrelocateable files they are virtual
6100 sym.st_value = h->root.u.def.value + input_sec->output_offset;
6101 if (! finfo->info->relocateable)
6102 sym.st_value += input_sec->output_section->vma;
6106 BFD_ASSERT (input_sec->owner == NULL
6107 || (input_sec->owner->flags & DYNAMIC) != 0);
6108 sym.st_shndx = SHN_UNDEF;
6109 input_sec = bfd_und_section_ptr;
6114 case bfd_link_hash_common:
6115 input_sec = h->root.u.c.p->section;
6116 sym.st_shndx = SHN_COMMON;
6117 sym.st_value = 1 << h->root.u.c.p->alignment_power;
6120 case bfd_link_hash_indirect:
6121 /* These symbols are created by symbol versioning. They point
6122 to the decorated version of the name. For example, if the
6123 symbol foo@@GNU_1.2 is the default, which should be used when
6124 foo is used with no version, then we add an indirect symbol
6125 foo which points to foo@@GNU_1.2. We ignore these symbols,
6126 since the indirected symbol is already in the hash table. */
6130 /* Give the processor backend a chance to tweak the symbol value,
6131 and also to finish up anything that needs to be done for this
6132 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6133 forced local syms when non-shared is due to a historical quirk. */
6134 if ((h->dynindx != -1
6135 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6136 && (finfo->info->shared
6137 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6138 && elf_hash_table (finfo->info)->dynamic_sections_created)
6140 struct elf_backend_data *bed;
6142 bed = get_elf_backend_data (finfo->output_bfd);
6143 if (! ((*bed->elf_backend_finish_dynamic_symbol)
6144 (finfo->output_bfd, finfo->info, h, &sym)))
6146 eoinfo->failed = true;
6151 /* If we are marking the symbol as undefined, and there are no
6152 non-weak references to this symbol from a regular object, then
6153 mark the symbol as weak undefined; if there are non-weak
6154 references, mark the symbol as strong. We can't do this earlier,
6155 because it might not be marked as undefined until the
6156 finish_dynamic_symbol routine gets through with it. */
6157 if (sym.st_shndx == SHN_UNDEF
6158 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
6159 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
6160 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
6164 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
6165 bindtype = STB_GLOBAL;
6167 bindtype = STB_WEAK;
6168 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
6171 /* If a symbol is not defined locally, we clear the visibility
6173 if (! finfo->info->relocateable
6174 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6175 sym.st_other ^= ELF_ST_VISIBILITY (sym.st_other);
6177 /* If this symbol should be put in the .dynsym section, then put it
6178 there now. We have already know the symbol index. We also fill
6179 in the entry in the .hash section. */
6180 if (h->dynindx != -1
6181 && elf_hash_table (finfo->info)->dynamic_sections_created)
6185 size_t hash_entry_size;
6186 bfd_byte *bucketpos;
6188 Elf_External_Sym *esym;
6190 sym.st_name = h->dynstr_index;
6191 esym = (Elf_External_Sym *) finfo->dynsym_sec->contents + h->dynindx;
6192 elf_swap_symbol_out (finfo->output_bfd, &sym, (PTR) esym, (PTR) 0);
6194 bucketcount = elf_hash_table (finfo->info)->bucketcount;
6195 bucket = h->elf_hash_value % bucketcount;
6197 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
6198 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
6199 + (bucket + 2) * hash_entry_size);
6200 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
6201 bfd_put (8 * hash_entry_size, finfo->output_bfd, (bfd_vma) h->dynindx,
6203 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
6204 ((bfd_byte *) finfo->hash_sec->contents
6205 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
6207 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
6209 Elf_Internal_Versym iversym;
6210 Elf_External_Versym *eversym;
6212 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6214 if (h->verinfo.verdef == NULL)
6215 iversym.vs_vers = 0;
6217 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
6221 if (h->verinfo.vertree == NULL)
6222 iversym.vs_vers = 1;
6224 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
6227 if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
6228 iversym.vs_vers |= VERSYM_HIDDEN;
6230 eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
6231 eversym += h->dynindx;
6232 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
6236 /* If we're stripping it, then it was just a dynamic symbol, and
6237 there's nothing else to do. */
6241 h->indx = bfd_get_symcount (finfo->output_bfd);
6243 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
6245 eoinfo->failed = true;
6252 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
6253 originated from the section given by INPUT_REL_HDR) to the
6257 elf_link_output_relocs (output_bfd, input_section, input_rel_hdr,
6260 asection *input_section;
6261 Elf_Internal_Shdr *input_rel_hdr;
6262 Elf_Internal_Rela *internal_relocs;
6264 Elf_Internal_Rela *irela;
6265 Elf_Internal_Rela *irelaend;
6266 Elf_Internal_Shdr *output_rel_hdr;
6267 asection *output_section;
6268 unsigned int *rel_countp = NULL;
6269 struct elf_backend_data *bed;
6272 output_section = input_section->output_section;
6273 output_rel_hdr = NULL;
6275 if (elf_section_data (output_section)->rel_hdr.sh_entsize
6276 == input_rel_hdr->sh_entsize)
6278 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
6279 rel_countp = &elf_section_data (output_section)->rel_count;
6281 else if (elf_section_data (output_section)->rel_hdr2
6282 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
6283 == input_rel_hdr->sh_entsize))
6285 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
6286 rel_countp = &elf_section_data (output_section)->rel_count2;
6289 BFD_ASSERT (output_rel_hdr != NULL);
6291 bed = get_elf_backend_data (output_bfd);
6292 irela = internal_relocs;
6293 irelaend = irela + NUM_SHDR_ENTRIES (input_rel_hdr)
6294 * bed->s->int_rels_per_ext_rel;
6296 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
6298 Elf_External_Rel *erel;
6299 Elf_Internal_Rel *irel;
6301 amt = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
6302 irel = (Elf_Internal_Rel *) bfd_zmalloc (amt);
6305 (*_bfd_error_handler) (_("Error: out of memory"));
6309 erel = ((Elf_External_Rel *) output_rel_hdr->contents + *rel_countp);
6310 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erel++)
6314 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
6316 irel[i].r_offset = irela[i].r_offset;
6317 irel[i].r_info = irela[i].r_info;
6318 BFD_ASSERT (irela[i].r_addend == 0);
6321 if (bed->s->swap_reloc_out)
6322 (*bed->s->swap_reloc_out) (output_bfd, irel, (PTR) erel);
6324 elf_swap_reloc_out (output_bfd, irel, erel);
6331 Elf_External_Rela *erela;
6333 BFD_ASSERT (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rela));
6335 erela = ((Elf_External_Rela *) output_rel_hdr->contents + *rel_countp);
6336 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erela++)
6337 if (bed->s->swap_reloca_out)
6338 (*bed->s->swap_reloca_out) (output_bfd, irela, (PTR) erela);
6340 elf_swap_reloca_out (output_bfd, irela, erela);
6343 /* Bump the counter, so that we know where to add the next set of
6345 *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr);
6348 /* Link an input file into the linker output file. This function
6349 handles all the sections and relocations of the input file at once.
6350 This is so that we only have to read the local symbols once, and
6351 don't have to keep them in memory. */
6354 elf_link_input_bfd (finfo, input_bfd)
6355 struct elf_final_link_info *finfo;
6358 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
6359 bfd *, asection *, bfd_byte *,
6360 Elf_Internal_Rela *,
6361 Elf_Internal_Sym *, asection **));
6363 Elf_Internal_Shdr *symtab_hdr;
6364 Elf_Internal_Shdr *shndx_hdr;
6367 Elf_External_Sym *external_syms;
6368 Elf_External_Sym *esym;
6369 Elf_External_Sym *esymend;
6370 Elf_External_Sym_Shndx *shndx_buf;
6371 Elf_External_Sym_Shndx *shndx;
6372 Elf_Internal_Sym *isym;
6374 asection **ppsection;
6376 struct elf_backend_data *bed;
6377 boolean emit_relocs;
6378 struct elf_link_hash_entry **sym_hashes;
6380 output_bfd = finfo->output_bfd;
6381 bed = get_elf_backend_data (output_bfd);
6382 relocate_section = bed->elf_backend_relocate_section;
6384 /* If this is a dynamic object, we don't want to do anything here:
6385 we don't want the local symbols, and we don't want the section
6387 if ((input_bfd->flags & DYNAMIC) != 0)
6390 emit_relocs = (finfo->info->relocateable
6391 || finfo->info->emitrelocations
6392 || bed->elf_backend_emit_relocs);
6394 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
6395 if (elf_bad_symtab (input_bfd))
6397 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6402 locsymcount = symtab_hdr->sh_info;
6403 extsymoff = symtab_hdr->sh_info;
6406 /* Read the local symbols. */
6407 if (symtab_hdr->contents != NULL)
6408 external_syms = (Elf_External_Sym *) symtab_hdr->contents;
6409 else if (locsymcount == 0)
6410 external_syms = NULL;
6413 bfd_size_type amt = locsymcount * sizeof (Elf_External_Sym);
6414 external_syms = finfo->external_syms;
6415 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
6416 || bfd_bread (external_syms, amt, input_bfd) != amt)
6420 shndx_hdr = &elf_tdata (input_bfd)->symtab_shndx_hdr;
6422 if (shndx_hdr->sh_size != 0 && locsymcount != 0)
6424 bfd_size_type amt = locsymcount * sizeof (Elf_External_Sym_Shndx);
6425 shndx_buf = finfo->locsym_shndx;
6426 if (bfd_seek (input_bfd, shndx_hdr->sh_offset, SEEK_SET) != 0
6427 || bfd_bread (shndx_buf, amt, input_bfd) != amt)
6431 /* Swap in the local symbols and write out the ones which we know
6432 are going into the output file. */
6433 for (esym = external_syms, esymend = esym + locsymcount,
6434 isym = finfo->internal_syms, pindex = finfo->indices,
6435 ppsection = finfo->sections, shndx = shndx_buf;
6437 esym++, isym++, pindex++, ppsection++,
6438 shndx = (shndx != NULL ? shndx + 1 : NULL))
6442 Elf_Internal_Sym osym;
6444 elf_swap_symbol_in (input_bfd, esym, shndx, isym);
6447 if (elf_bad_symtab (input_bfd))
6449 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
6456 if (isym->st_shndx == SHN_UNDEF)
6457 isec = bfd_und_section_ptr;
6458 else if (isym->st_shndx < SHN_LORESERVE
6459 || isym->st_shndx > SHN_HIRESERVE)
6461 isec = section_from_elf_index (input_bfd, isym->st_shndx);
6463 && elf_section_data (isec)->sec_info_type == ELF_INFO_TYPE_MERGE
6464 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
6466 _bfd_merged_section_offset (output_bfd, &isec,
6467 elf_section_data (isec)->sec_info,
6468 isym->st_value, (bfd_vma) 0);
6470 else if (isym->st_shndx == SHN_ABS)
6471 isec = bfd_abs_section_ptr;
6472 else if (isym->st_shndx == SHN_COMMON)
6473 isec = bfd_com_section_ptr;
6482 /* Don't output the first, undefined, symbol. */
6483 if (esym == external_syms)
6486 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
6488 /* We never output section symbols. Instead, we use the
6489 section symbol of the corresponding section in the output
6494 /* If we are stripping all symbols, we don't want to output this
6496 if (finfo->info->strip == strip_all)
6499 /* If we are discarding all local symbols, we don't want to
6500 output this one. If we are generating a relocateable output
6501 file, then some of the local symbols may be required by
6502 relocs; we output them below as we discover that they are
6504 if (finfo->info->discard == discard_all)
6507 /* If this symbol is defined in a section which we are
6508 discarding, we don't need to keep it, but note that
6509 linker_mark is only reliable for sections that have contents.
6510 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6511 as well as linker_mark. */
6512 if ((isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
6514 && ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
6515 || (! finfo->info->relocateable
6516 && (isec->flags & SEC_EXCLUDE) != 0)))
6519 /* Get the name of the symbol. */
6520 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
6525 /* See if we are discarding symbols with this name. */
6526 if ((finfo->info->strip == strip_some
6527 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
6529 || (((finfo->info->discard == discard_sec_merge
6530 && (isec->flags & SEC_MERGE) && ! finfo->info->relocateable)
6531 || finfo->info->discard == discard_l)
6532 && bfd_is_local_label_name (input_bfd, name)))
6535 /* If we get here, we are going to output this symbol. */
6539 /* Adjust the section index for the output file. */
6540 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
6541 isec->output_section);
6542 if (osym.st_shndx == SHN_BAD)
6545 *pindex = bfd_get_symcount (output_bfd);
6547 /* ELF symbols in relocateable files are section relative, but
6548 in executable files they are virtual addresses. Note that
6549 this code assumes that all ELF sections have an associated
6550 BFD section with a reasonable value for output_offset; below
6551 we assume that they also have a reasonable value for
6552 output_section. Any special sections must be set up to meet
6553 these requirements. */
6554 osym.st_value += isec->output_offset;
6555 if (! finfo->info->relocateable)
6556 osym.st_value += isec->output_section->vma;
6558 if (! elf_link_output_sym (finfo, name, &osym, isec))
6562 /* Relocate the contents of each section. */
6563 sym_hashes = elf_sym_hashes (input_bfd);
6564 for (o = input_bfd->sections; o != NULL; o = o->next)
6568 if (! o->linker_mark)
6570 /* This section was omitted from the link. */
6574 if ((o->flags & SEC_HAS_CONTENTS) == 0
6575 || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
6578 if ((o->flags & SEC_LINKER_CREATED) != 0)
6580 /* Section was created by elf_link_create_dynamic_sections
6585 /* Get the contents of the section. They have been cached by a
6586 relaxation routine. Note that o is a section in an input
6587 file, so the contents field will not have been set by any of
6588 the routines which work on output files. */
6589 if (elf_section_data (o)->this_hdr.contents != NULL)
6590 contents = elf_section_data (o)->this_hdr.contents;
6593 contents = finfo->contents;
6594 if (! bfd_get_section_contents (input_bfd, o, contents,
6595 (file_ptr) 0, o->_raw_size))
6599 if ((o->flags & SEC_RELOC) != 0)
6601 Elf_Internal_Rela *internal_relocs;
6603 /* Get the swapped relocs. */
6604 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
6605 (input_bfd, o, finfo->external_relocs,
6606 finfo->internal_relocs, false));
6607 if (internal_relocs == NULL
6608 && o->reloc_count > 0)
6611 /* Run through the relocs looking for any against symbols
6612 from discarded sections and section symbols from
6613 removed link-once sections. Complain about relocs
6614 against discarded sections. Zero relocs against removed
6615 link-once sections. We should really complain if
6616 anything in the final link tries to use it, but
6617 DWARF-based exception handling might have an entry in
6618 .eh_frame to describe a routine in the linkonce section,
6619 and it turns out to be hard to remove the .eh_frame
6620 entry too. FIXME. */
6621 if (!finfo->info->relocateable
6622 && !elf_section_ignore_discarded_relocs (o))
6624 Elf_Internal_Rela *rel, *relend;
6626 rel = internal_relocs;
6627 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
6628 for ( ; rel < relend; rel++)
6630 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
6632 if (r_symndx >= locsymcount
6633 || (elf_bad_symtab (input_bfd)
6634 && finfo->sections[r_symndx] == NULL))
6636 struct elf_link_hash_entry *h;
6638 h = sym_hashes[r_symndx - extsymoff];
6639 while (h->root.type == bfd_link_hash_indirect
6640 || h->root.type == bfd_link_hash_warning)
6641 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6643 /* Complain if the definition comes from a
6644 discarded section. */
6645 if ((h->root.type == bfd_link_hash_defined
6646 || h->root.type == bfd_link_hash_defweak)
6647 && elf_discarded_section (h->root.u.def.section))
6649 #if BFD_VERSION_DATE < 20031005
6650 if ((o->flags & SEC_DEBUGGING) != 0)
6652 #if BFD_VERSION_DATE > 20021005
6653 (*finfo->info->callbacks->warning)
6655 _("warning: relocation against removed section; zeroing"),
6656 NULL, input_bfd, o, rel->r_offset);
6658 BFD_ASSERT (r_symndx != 0);
6659 memset (rel, 0, sizeof (*rel));
6664 if (! ((*finfo->info->callbacks->undefined_symbol)
6665 (finfo->info, h->root.root.string,
6666 input_bfd, o, rel->r_offset,
6674 asection *sec = finfo->sections[r_symndx];
6676 if (sec != NULL && elf_discarded_section (sec))
6678 #if BFD_VERSION_DATE < 20031005
6679 if ((o->flags & SEC_DEBUGGING) != 0
6680 || (sec->flags & SEC_LINK_ONCE) != 0)
6682 #if BFD_VERSION_DATE > 20021005
6683 (*finfo->info->callbacks->warning)
6685 _("warning: relocation against removed section"),
6686 NULL, input_bfd, o, rel->r_offset);
6688 BFD_ASSERT (r_symndx != 0);
6690 = ELF_R_INFO (0, ELF_R_TYPE (rel->r_info));
6698 = _("local symbols in discarded section %s");
6700 = strlen (sec->name) + strlen (msg) - 1;
6701 char *buf = (char *) bfd_malloc (amt);
6704 sprintf (buf, msg, sec->name);
6706 buf = (char *) sec->name;
6707 ok = (*finfo->info->callbacks
6708 ->undefined_symbol) (finfo->info, buf,
6712 if (buf != sec->name)
6722 /* Relocate the section by invoking a back end routine.
6724 The back end routine is responsible for adjusting the
6725 section contents as necessary, and (if using Rela relocs
6726 and generating a relocateable output file) adjusting the
6727 reloc addend as necessary.
6729 The back end routine does not have to worry about setting
6730 the reloc address or the reloc symbol index.
6732 The back end routine is given a pointer to the swapped in
6733 internal symbols, and can access the hash table entries
6734 for the external symbols via elf_sym_hashes (input_bfd).
6736 When generating relocateable output, the back end routine
6737 must handle STB_LOCAL/STT_SECTION symbols specially. The
6738 output symbol is going to be a section symbol
6739 corresponding to the output section, which will require
6740 the addend to be adjusted. */
6742 if (! (*relocate_section) (output_bfd, finfo->info,
6743 input_bfd, o, contents,
6745 finfo->internal_syms,
6751 Elf_Internal_Rela *irela;
6752 Elf_Internal_Rela *irelaend;
6753 struct elf_link_hash_entry **rel_hash;
6754 Elf_Internal_Shdr *input_rel_hdr;
6755 unsigned int next_erel;
6756 void (*reloc_emitter) PARAMS ((bfd *, asection *,
6757 Elf_Internal_Shdr *,
6758 Elf_Internal_Rela *));
6759 boolean rela_normal;
6761 input_rel_hdr = &elf_section_data (o)->rel_hdr;
6762 rela_normal = (bed->rela_normal
6763 && (input_rel_hdr->sh_entsize
6764 == sizeof (Elf_External_Rela)));
6766 /* Adjust the reloc addresses and symbol indices. */
6768 irela = internal_relocs;
6769 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
6770 rel_hash = (elf_section_data (o->output_section)->rel_hashes
6771 + elf_section_data (o->output_section)->rel_count
6772 + elf_section_data (o->output_section)->rel_count2);
6773 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
6775 unsigned long r_symndx;
6778 if (next_erel == bed->s->int_rels_per_ext_rel)
6784 irela->r_offset += o->output_offset;
6786 /* Relocs in an executable have to be virtual addresses. */
6787 if (!finfo->info->relocateable)
6788 irela->r_offset += o->output_section->vma;
6790 r_symndx = ELF_R_SYM (irela->r_info);
6795 if (r_symndx >= locsymcount
6796 || (elf_bad_symtab (input_bfd)
6797 && finfo->sections[r_symndx] == NULL))
6799 struct elf_link_hash_entry *rh;
6802 /* This is a reloc against a global symbol. We
6803 have not yet output all the local symbols, so
6804 we do not know the symbol index of any global
6805 symbol. We set the rel_hash entry for this
6806 reloc to point to the global hash table entry
6807 for this symbol. The symbol index is then
6808 set at the end of elf_bfd_final_link. */
6809 indx = r_symndx - extsymoff;
6810 rh = elf_sym_hashes (input_bfd)[indx];
6811 while (rh->root.type == bfd_link_hash_indirect
6812 || rh->root.type == bfd_link_hash_warning)
6813 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
6815 /* Setting the index to -2 tells
6816 elf_link_output_extsym that this symbol is
6818 BFD_ASSERT (rh->indx < 0);
6826 /* This is a reloc against a local symbol. */
6829 isym = finfo->internal_syms + r_symndx;
6830 sec = finfo->sections[r_symndx];
6831 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
6833 /* I suppose the backend ought to fill in the
6834 section of any STT_SECTION symbol against a
6835 processor specific section. If we have
6836 discarded a section, the output_section will
6837 be the absolute section. */
6838 if (bfd_is_abs_section (sec)
6840 && bfd_is_abs_section (sec->output_section)))
6842 else if (sec == NULL || sec->owner == NULL)
6844 bfd_set_error (bfd_error_bad_value);
6849 r_symndx = sec->output_section->target_index;
6850 BFD_ASSERT (r_symndx != 0);
6853 /* Adjust the addend according to where the
6854 section winds up in the output section. */
6856 irela->r_addend += sec->output_offset;
6860 if (finfo->indices[r_symndx] == -1)
6862 unsigned long shlink;
6866 if (finfo->info->strip == strip_all)
6868 /* You can't do ld -r -s. */
6869 bfd_set_error (bfd_error_invalid_operation);
6873 /* This symbol was skipped earlier, but
6874 since it is needed by a reloc, we
6875 must output it now. */
6876 shlink = symtab_hdr->sh_link;
6877 name = (bfd_elf_string_from_elf_section
6878 (input_bfd, shlink, isym->st_name));
6882 osec = sec->output_section;
6884 _bfd_elf_section_from_bfd_section (output_bfd,
6886 if (isym->st_shndx == SHN_BAD)
6889 isym->st_value += sec->output_offset;
6890 if (! finfo->info->relocateable)
6891 isym->st_value += osec->vma;
6893 finfo->indices[r_symndx]
6894 = bfd_get_symcount (output_bfd);
6896 if (! elf_link_output_sym (finfo, name, isym, sec))
6900 r_symndx = finfo->indices[r_symndx];
6903 irela->r_info = ELF_R_INFO (r_symndx,
6904 ELF_R_TYPE (irela->r_info));
6907 /* Swap out the relocs. */
6908 if (bed->elf_backend_emit_relocs
6909 && !(finfo->info->relocateable
6910 || finfo->info->emitrelocations))
6911 reloc_emitter = bed->elf_backend_emit_relocs;
6913 reloc_emitter = elf_link_output_relocs;
6915 (*reloc_emitter) (output_bfd, o, input_rel_hdr, internal_relocs);
6917 input_rel_hdr = elf_section_data (o)->rel_hdr2;
6920 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
6921 * bed->s->int_rels_per_ext_rel);
6922 (*reloc_emitter) (output_bfd, o, input_rel_hdr,
6929 /* Write out the modified section contents. */
6930 if (bed->elf_backend_write_section
6931 && (*bed->elf_backend_write_section) (output_bfd, o, contents))
6933 /* Section written out. */
6935 else switch (elf_section_data (o)->sec_info_type)
6937 case ELF_INFO_TYPE_STABS:
6938 if (! (_bfd_write_section_stabs
6940 &elf_hash_table (finfo->info)->stab_info,
6941 o, &elf_section_data (o)->sec_info, contents)))
6944 case ELF_INFO_TYPE_MERGE:
6945 if (! (_bfd_write_merged_section
6946 (output_bfd, o, elf_section_data (o)->sec_info)))
6949 case ELF_INFO_TYPE_EH_FRAME:
6954 = bfd_get_section_by_name (elf_hash_table (finfo->info)->dynobj,
6956 if (! (_bfd_elf_write_section_eh_frame (output_bfd, o, ehdrsec,
6963 bfd_size_type sec_size;
6965 sec_size = (o->_cooked_size != 0 ? o->_cooked_size : o->_raw_size);
6966 if (! (o->flags & SEC_EXCLUDE)
6967 && ! bfd_set_section_contents (output_bfd, o->output_section,
6969 (file_ptr) o->output_offset,
6980 /* Generate a reloc when linking an ELF file. This is a reloc
6981 requested by the linker, and does come from any input file. This
6982 is used to build constructor and destructor tables when linking
6986 elf_reloc_link_order (output_bfd, info, output_section, link_order)
6988 struct bfd_link_info *info;
6989 asection *output_section;
6990 struct bfd_link_order *link_order;
6992 reloc_howto_type *howto;
6996 struct elf_link_hash_entry **rel_hash_ptr;
6997 Elf_Internal_Shdr *rel_hdr;
6998 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
7000 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
7003 bfd_set_error (bfd_error_bad_value);
7007 addend = link_order->u.reloc.p->addend;
7009 /* Figure out the symbol index. */
7010 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
7011 + elf_section_data (output_section)->rel_count
7012 + elf_section_data (output_section)->rel_count2);
7013 if (link_order->type == bfd_section_reloc_link_order)
7015 indx = link_order->u.reloc.p->u.section->target_index;
7016 BFD_ASSERT (indx != 0);
7017 *rel_hash_ptr = NULL;
7021 struct elf_link_hash_entry *h;
7023 /* Treat a reloc against a defined symbol as though it were
7024 actually against the section. */
7025 h = ((struct elf_link_hash_entry *)
7026 bfd_wrapped_link_hash_lookup (output_bfd, info,
7027 link_order->u.reloc.p->u.name,
7028 false, false, true));
7030 && (h->root.type == bfd_link_hash_defined
7031 || h->root.type == bfd_link_hash_defweak))
7035 section = h->root.u.def.section;
7036 indx = section->output_section->target_index;
7037 *rel_hash_ptr = NULL;
7038 /* It seems that we ought to add the symbol value to the
7039 addend here, but in practice it has already been added
7040 because it was passed to constructor_callback. */
7041 addend += section->output_section->vma + section->output_offset;
7045 /* Setting the index to -2 tells elf_link_output_extsym that
7046 this symbol is used by a reloc. */
7053 if (! ((*info->callbacks->unattached_reloc)
7054 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
7055 (asection *) NULL, (bfd_vma) 0)))
7061 /* If this is an inplace reloc, we must write the addend into the
7063 if (howto->partial_inplace && addend != 0)
7066 bfd_reloc_status_type rstat;
7069 const char *sym_name;
7071 size = bfd_get_reloc_size (howto);
7072 buf = (bfd_byte *) bfd_zmalloc (size);
7073 if (buf == (bfd_byte *) NULL)
7075 rstat = _bfd_relocate_contents (howto, output_bfd, (bfd_vma) addend, buf);
7082 case bfd_reloc_outofrange:
7085 case bfd_reloc_overflow:
7086 if (link_order->type == bfd_section_reloc_link_order)
7087 sym_name = bfd_section_name (output_bfd,
7088 link_order->u.reloc.p->u.section);
7090 sym_name = link_order->u.reloc.p->u.name;
7091 if (! ((*info->callbacks->reloc_overflow)
7092 (info, sym_name, howto->name, addend,
7093 (bfd *) NULL, (asection *) NULL, (bfd_vma) 0)))
7100 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
7101 (file_ptr) link_order->offset, size);
7107 /* The address of a reloc is relative to the section in a
7108 relocateable file, and is a virtual address in an executable
7110 offset = link_order->offset;
7111 if (! info->relocateable)
7112 offset += output_section->vma;
7114 rel_hdr = &elf_section_data (output_section)->rel_hdr;
7116 if (rel_hdr->sh_type == SHT_REL)
7119 Elf_Internal_Rel *irel;
7120 Elf_External_Rel *erel;
7123 size = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
7124 irel = (Elf_Internal_Rel *) bfd_zmalloc (size);
7128 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7129 irel[i].r_offset = offset;
7130 irel[0].r_info = ELF_R_INFO (indx, howto->type);
7132 erel = ((Elf_External_Rel *) rel_hdr->contents
7133 + elf_section_data (output_section)->rel_count);
7135 if (bed->s->swap_reloc_out)
7136 (*bed->s->swap_reloc_out) (output_bfd, irel, (bfd_byte *) erel);
7138 elf_swap_reloc_out (output_bfd, irel, erel);
7145 Elf_Internal_Rela *irela;
7146 Elf_External_Rela *erela;
7149 size = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
7150 irela = (Elf_Internal_Rela *) bfd_zmalloc (size);
7154 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7155 irela[i].r_offset = offset;
7156 irela[0].r_info = ELF_R_INFO (indx, howto->type);
7157 irela[0].r_addend = addend;
7159 erela = ((Elf_External_Rela *) rel_hdr->contents
7160 + elf_section_data (output_section)->rel_count);
7162 if (bed->s->swap_reloca_out)
7163 (*bed->s->swap_reloca_out) (output_bfd, irela, (bfd_byte *) erela);
7165 elf_swap_reloca_out (output_bfd, irela, erela);
7168 ++elf_section_data (output_section)->rel_count;
7173 /* Allocate a pointer to live in a linker created section. */
7176 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
7178 struct bfd_link_info *info;
7179 elf_linker_section_t *lsect;
7180 struct elf_link_hash_entry *h;
7181 const Elf_Internal_Rela *rel;
7183 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
7184 elf_linker_section_pointers_t *linker_section_ptr;
7185 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
7188 BFD_ASSERT (lsect != NULL);
7190 /* Is this a global symbol? */
7193 /* Has this symbol already been allocated? If so, our work is done. */
7194 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
7199 ptr_linker_section_ptr = &h->linker_section_pointer;
7200 /* Make sure this symbol is output as a dynamic symbol. */
7201 if (h->dynindx == -1)
7203 if (! elf_link_record_dynamic_symbol (info, h))
7207 if (lsect->rel_section)
7208 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
7212 /* Allocation of a pointer to a local symbol. */
7213 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
7215 /* Allocate a table to hold the local symbols if first time. */
7218 unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
7219 register unsigned int i;
7222 amt *= sizeof (elf_linker_section_pointers_t *);
7223 ptr = (elf_linker_section_pointers_t **) bfd_alloc (abfd, amt);
7228 elf_local_ptr_offsets (abfd) = ptr;
7229 for (i = 0; i < num_symbols; i++)
7230 ptr[i] = (elf_linker_section_pointers_t *) 0;
7233 /* Has this symbol already been allocated? If so, our work is done. */
7234 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
7239 ptr_linker_section_ptr = &ptr[r_symndx];
7243 /* If we are generating a shared object, we need to
7244 output a R_<xxx>_RELATIVE reloc so that the
7245 dynamic linker can adjust this GOT entry. */
7246 BFD_ASSERT (lsect->rel_section != NULL);
7247 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
7251 /* Allocate space for a pointer in the linker section, and allocate
7252 a new pointer record from internal memory. */
7253 BFD_ASSERT (ptr_linker_section_ptr != NULL);
7254 amt = sizeof (elf_linker_section_pointers_t);
7255 linker_section_ptr = (elf_linker_section_pointers_t *) bfd_alloc (abfd, amt);
7257 if (!linker_section_ptr)
7260 linker_section_ptr->next = *ptr_linker_section_ptr;
7261 linker_section_ptr->addend = rel->r_addend;
7262 linker_section_ptr->which = lsect->which;
7263 linker_section_ptr->written_address_p = false;
7264 *ptr_linker_section_ptr = linker_section_ptr;
7267 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
7269 linker_section_ptr->offset = (lsect->section->_raw_size
7270 - lsect->hole_size + (ARCH_SIZE / 8));
7271 lsect->hole_offset += ARCH_SIZE / 8;
7272 lsect->sym_offset += ARCH_SIZE / 8;
7273 if (lsect->sym_hash)
7275 /* Bump up symbol value if needed. */
7276 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
7278 fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
7279 lsect->sym_hash->root.root.string,
7280 (long) ARCH_SIZE / 8,
7281 (long) lsect->sym_hash->root.u.def.value);
7287 linker_section_ptr->offset = lsect->section->_raw_size;
7289 lsect->section->_raw_size += ARCH_SIZE / 8;
7293 "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
7294 lsect->name, (long) linker_section_ptr->offset,
7295 (long) lsect->section->_raw_size);
7302 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
7305 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
7308 /* Fill in the address for a pointer generated in a linker section. */
7311 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h,
7312 relocation, rel, relative_reloc)
7315 struct bfd_link_info *info;
7316 elf_linker_section_t *lsect;
7317 struct elf_link_hash_entry *h;
7319 const Elf_Internal_Rela *rel;
7322 elf_linker_section_pointers_t *linker_section_ptr;
7324 BFD_ASSERT (lsect != NULL);
7328 /* Handle global symbol. */
7329 linker_section_ptr = (_bfd_elf_find_pointer_linker_section
7330 (h->linker_section_pointer,
7334 BFD_ASSERT (linker_section_ptr != NULL);
7336 if (! elf_hash_table (info)->dynamic_sections_created
7339 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
7341 /* This is actually a static link, or it is a
7342 -Bsymbolic link and the symbol is defined
7343 locally. We must initialize this entry in the
7346 When doing a dynamic link, we create a .rela.<xxx>
7347 relocation entry to initialize the value. This
7348 is done in the finish_dynamic_symbol routine. */
7349 if (!linker_section_ptr->written_address_p)
7351 linker_section_ptr->written_address_p = true;
7352 bfd_put_ptr (output_bfd,
7353 relocation + linker_section_ptr->addend,
7354 (lsect->section->contents
7355 + linker_section_ptr->offset));
7361 /* Handle local symbol. */
7362 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
7363 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
7364 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
7365 linker_section_ptr = (_bfd_elf_find_pointer_linker_section
7366 (elf_local_ptr_offsets (input_bfd)[r_symndx],
7370 BFD_ASSERT (linker_section_ptr != NULL);
7372 /* Write out pointer if it hasn't been rewritten out before. */
7373 if (!linker_section_ptr->written_address_p)
7375 linker_section_ptr->written_address_p = true;
7376 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
7377 lsect->section->contents + linker_section_ptr->offset);
7381 asection *srel = lsect->rel_section;
7382 Elf_Internal_Rela *outrel;
7383 Elf_External_Rela *erel;
7384 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
7388 amt = sizeof (Elf_Internal_Rela) * bed->s->int_rels_per_ext_rel;
7389 outrel = (Elf_Internal_Rela *) bfd_zmalloc (amt);
7392 (*_bfd_error_handler) (_("Error: out of memory"));
7396 /* We need to generate a relative reloc for the dynamic
7400 srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
7402 lsect->rel_section = srel;
7405 BFD_ASSERT (srel != NULL);
7407 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7408 outrel[i].r_offset = (lsect->section->output_section->vma
7409 + lsect->section->output_offset
7410 + linker_section_ptr->offset);
7411 outrel[0].r_info = ELF_R_INFO (0, relative_reloc);
7412 outrel[0].r_addend = 0;
7413 erel = (Elf_External_Rela *) lsect->section->contents;
7414 erel += elf_section_data (lsect->section)->rel_count;
7415 elf_swap_reloca_out (output_bfd, outrel, erel);
7416 ++elf_section_data (lsect->section)->rel_count;
7423 relocation = (lsect->section->output_offset
7424 + linker_section_ptr->offset
7425 - lsect->hole_offset
7426 - lsect->sym_offset);
7430 "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
7431 lsect->name, (long) relocation, (long) relocation);
7434 /* Subtract out the addend, because it will get added back in by the normal
7436 return relocation - linker_section_ptr->addend;
7439 /* Garbage collect unused sections. */
7441 static boolean elf_gc_mark
7442 PARAMS ((struct bfd_link_info *info, asection *sec,
7443 asection * (*gc_mark_hook)
7444 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
7445 struct elf_link_hash_entry *, Elf_Internal_Sym *))));
7447 static boolean elf_gc_sweep
7448 PARAMS ((struct bfd_link_info *info,
7449 boolean (*gc_sweep_hook)
7450 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
7451 const Elf_Internal_Rela *relocs))));
7453 static boolean elf_gc_sweep_symbol
7454 PARAMS ((struct elf_link_hash_entry *h, PTR idxptr));
7456 static boolean elf_gc_allocate_got_offsets
7457 PARAMS ((struct elf_link_hash_entry *h, PTR offarg));
7459 static boolean elf_gc_propagate_vtable_entries_used
7460 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
7462 static boolean elf_gc_smash_unused_vtentry_relocs
7463 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
7465 /* The mark phase of garbage collection. For a given section, mark
7466 it and any sections in this section's group, and all the sections
7467 which define symbols to which it refers. */
7470 elf_gc_mark (info, sec, gc_mark_hook)
7471 struct bfd_link_info *info;
7473 asection * (*gc_mark_hook)
7474 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
7475 struct elf_link_hash_entry *, Elf_Internal_Sym *));
7478 asection *group_sec;
7482 /* Mark all the sections in the group. */
7483 group_sec = elf_section_data (sec)->next_in_group;
7484 if (group_sec && !group_sec->gc_mark)
7485 if (!elf_gc_mark (info, group_sec, gc_mark_hook))
7488 /* Look through the section relocs. */
7490 if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
7492 Elf_Internal_Rela *relstart, *rel, *relend;
7493 Elf_Internal_Shdr *symtab_hdr;
7494 Elf_Internal_Shdr *shndx_hdr;
7495 struct elf_link_hash_entry **sym_hashes;
7498 Elf_External_Sym *locsyms, *freesyms = NULL;
7499 Elf_External_Sym_Shndx *locsym_shndx;
7500 bfd *input_bfd = sec->owner;
7501 struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
7503 /* GCFIXME: how to arrange so that relocs and symbols are not
7504 reread continually? */
7506 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
7507 sym_hashes = elf_sym_hashes (input_bfd);
7509 /* Read the local symbols. */
7510 if (elf_bad_symtab (input_bfd))
7512 nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
7516 extsymoff = nlocsyms = symtab_hdr->sh_info;
7518 if (symtab_hdr->contents)
7519 locsyms = (Elf_External_Sym *) symtab_hdr->contents;
7520 else if (nlocsyms == 0)
7524 bfd_size_type amt = nlocsyms * sizeof (Elf_External_Sym);
7525 locsyms = freesyms = bfd_malloc (amt);
7526 if (freesyms == NULL
7527 || bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
7528 || bfd_bread (locsyms, amt, input_bfd) != amt)
7535 shndx_hdr = &elf_tdata (input_bfd)->symtab_shndx_hdr;
7536 locsym_shndx = NULL;
7537 if (shndx_hdr->sh_size != 0 && nlocsyms != 0)
7539 bfd_size_type amt = nlocsyms * sizeof (Elf_External_Sym_Shndx);
7540 locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
7541 if (bfd_seek (input_bfd, shndx_hdr->sh_offset, SEEK_SET) != 0
7542 || bfd_bread (locsym_shndx, amt, input_bfd) != amt)
7546 /* Read the relocations. */
7547 relstart = (NAME(_bfd_elf,link_read_relocs)
7548 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL,
7549 info->keep_memory));
7550 if (relstart == NULL)
7555 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
7557 for (rel = relstart; rel < relend; rel++)
7559 unsigned long r_symndx;
7561 struct elf_link_hash_entry *h;
7564 r_symndx = ELF_R_SYM (rel->r_info);
7568 if (elf_bad_symtab (sec->owner))
7570 elf_swap_symbol_in (input_bfd,
7572 locsym_shndx + (locsym_shndx ? r_symndx : 0),
7574 if (ELF_ST_BIND (s.st_info) == STB_LOCAL)
7575 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
7578 h = sym_hashes[r_symndx - extsymoff];
7579 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
7582 else if (r_symndx >= nlocsyms)
7584 h = sym_hashes[r_symndx - extsymoff];
7585 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
7589 elf_swap_symbol_in (input_bfd,
7591 locsym_shndx + (locsym_shndx ? r_symndx : 0),
7593 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
7596 if (rsec && !rsec->gc_mark)
7598 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
7600 else if (!elf_gc_mark (info, rsec, gc_mark_hook))
7609 if (!info->keep_memory)
7619 /* The sweep phase of garbage collection. Remove all garbage sections. */
7622 elf_gc_sweep (info, gc_sweep_hook)
7623 struct bfd_link_info *info;
7624 boolean (*gc_sweep_hook)
7625 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
7626 const Elf_Internal_Rela *relocs));
7630 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
7634 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
7637 for (o = sub->sections; o != NULL; o = o->next)
7639 /* Keep special sections. Keep .debug sections. */
7640 if ((o->flags & SEC_LINKER_CREATED)
7641 || (o->flags & SEC_DEBUGGING))
7647 /* Skip sweeping sections already excluded. */
7648 if (o->flags & SEC_EXCLUDE)
7651 /* Since this is early in the link process, it is simple
7652 to remove a section from the output. */
7653 o->flags |= SEC_EXCLUDE;
7655 /* But we also have to update some of the relocation
7656 info we collected before. */
7658 && (o->flags & SEC_RELOC) && o->reloc_count > 0)
7660 Elf_Internal_Rela *internal_relocs;
7663 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
7664 (o->owner, o, NULL, NULL, info->keep_memory));
7665 if (internal_relocs == NULL)
7668 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
7670 if (!info->keep_memory)
7671 free (internal_relocs);
7679 /* Remove the symbols that were in the swept sections from the dynamic
7680 symbol table. GCFIXME: Anyone know how to get them out of the
7681 static symbol table as well? */
7685 elf_link_hash_traverse (elf_hash_table (info),
7686 elf_gc_sweep_symbol,
7689 elf_hash_table (info)->dynsymcount = i;
7695 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
7698 elf_gc_sweep_symbol (h, idxptr)
7699 struct elf_link_hash_entry *h;
7702 int *idx = (int *) idxptr;
7704 if (h->root.type == bfd_link_hash_warning)
7705 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7707 if (h->dynindx != -1
7708 && ((h->root.type != bfd_link_hash_defined
7709 && h->root.type != bfd_link_hash_defweak)
7710 || h->root.u.def.section->gc_mark))
7711 h->dynindx = (*idx)++;
7716 /* Propogate collected vtable information. This is called through
7717 elf_link_hash_traverse. */
7720 elf_gc_propagate_vtable_entries_used (h, okp)
7721 struct elf_link_hash_entry *h;
7724 if (h->root.type == bfd_link_hash_warning)
7725 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7727 /* Those that are not vtables. */
7728 if (h->vtable_parent == NULL)
7731 /* Those vtables that do not have parents, we cannot merge. */
7732 if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
7735 /* If we've already been done, exit. */
7736 if (h->vtable_entries_used && h->vtable_entries_used[-1])
7739 /* Make sure the parent's table is up to date. */
7740 elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
7742 if (h->vtable_entries_used == NULL)
7744 /* None of this table's entries were referenced. Re-use the
7746 h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
7747 h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
7754 /* Or the parent's entries into ours. */
7755 cu = h->vtable_entries_used;
7757 pu = h->vtable_parent->vtable_entries_used;
7760 asection *sec = h->root.u.def.section;
7761 struct elf_backend_data *bed = get_elf_backend_data (sec->owner);
7762 int file_align = bed->s->file_align;
7764 n = h->vtable_parent->vtable_entries_size / file_align;
7779 elf_gc_smash_unused_vtentry_relocs (h, okp)
7780 struct elf_link_hash_entry *h;
7784 bfd_vma hstart, hend;
7785 Elf_Internal_Rela *relstart, *relend, *rel;
7786 struct elf_backend_data *bed;
7789 if (h->root.type == bfd_link_hash_warning)
7790 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7792 /* Take care of both those symbols that do not describe vtables as
7793 well as those that are not loaded. */
7794 if (h->vtable_parent == NULL)
7797 BFD_ASSERT (h->root.type == bfd_link_hash_defined
7798 || h->root.type == bfd_link_hash_defweak);
7800 sec = h->root.u.def.section;
7801 hstart = h->root.u.def.value;
7802 hend = hstart + h->size;
7804 relstart = (NAME(_bfd_elf,link_read_relocs)
7805 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true));
7807 return *(boolean *) okp = false;
7808 bed = get_elf_backend_data (sec->owner);
7809 file_align = bed->s->file_align;
7811 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
7813 for (rel = relstart; rel < relend; ++rel)
7814 if (rel->r_offset >= hstart && rel->r_offset < hend)
7816 /* If the entry is in use, do nothing. */
7817 if (h->vtable_entries_used
7818 && (rel->r_offset - hstart) < h->vtable_entries_size)
7820 bfd_vma entry = (rel->r_offset - hstart) / file_align;
7821 if (h->vtable_entries_used[entry])
7824 /* Otherwise, kill it. */
7825 rel->r_offset = rel->r_info = rel->r_addend = 0;
7831 /* Do mark and sweep of unused sections. */
7834 elf_gc_sections (abfd, info)
7836 struct bfd_link_info *info;
7840 asection * (*gc_mark_hook)
7841 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
7842 struct elf_link_hash_entry *h, Elf_Internal_Sym *));
7844 if (!get_elf_backend_data (abfd)->can_gc_sections
7845 || info->relocateable || info->emitrelocations
7846 || elf_hash_table (info)->dynamic_sections_created)
7849 /* Apply transitive closure to the vtable entry usage info. */
7850 elf_link_hash_traverse (elf_hash_table (info),
7851 elf_gc_propagate_vtable_entries_used,
7856 /* Kill the vtable relocations that were not used. */
7857 elf_link_hash_traverse (elf_hash_table (info),
7858 elf_gc_smash_unused_vtentry_relocs,
7863 /* Grovel through relocs to find out who stays ... */
7865 gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
7866 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
7870 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
7873 for (o = sub->sections; o != NULL; o = o->next)
7875 if (o->flags & SEC_KEEP)
7876 if (!elf_gc_mark (info, o, gc_mark_hook))
7881 /* ... and mark SEC_EXCLUDE for those that go. */
7882 if (!elf_gc_sweep (info, get_elf_backend_data (abfd)->gc_sweep_hook))
7888 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
7891 elf_gc_record_vtinherit (abfd, sec, h, offset)
7894 struct elf_link_hash_entry *h;
7897 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
7898 struct elf_link_hash_entry **search, *child;
7899 bfd_size_type extsymcount;
7901 /* The sh_info field of the symtab header tells us where the
7902 external symbols start. We don't care about the local symbols at
7904 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
7905 if (!elf_bad_symtab (abfd))
7906 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
7908 sym_hashes = elf_sym_hashes (abfd);
7909 sym_hashes_end = sym_hashes + extsymcount;
7911 /* Hunt down the child symbol, which is in this section at the same
7912 offset as the relocation. */
7913 for (search = sym_hashes; search != sym_hashes_end; ++search)
7915 if ((child = *search) != NULL
7916 && (child->root.type == bfd_link_hash_defined
7917 || child->root.type == bfd_link_hash_defweak)
7918 && child->root.u.def.section == sec
7919 && child->root.u.def.value == offset)
7923 (*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
7924 bfd_archive_filename (abfd), sec->name,
7925 (unsigned long) offset);
7926 bfd_set_error (bfd_error_invalid_operation);
7932 /* This *should* only be the absolute section. It could potentially
7933 be that someone has defined a non-global vtable though, which
7934 would be bad. It isn't worth paging in the local symbols to be
7935 sure though; that case should simply be handled by the assembler. */
7937 child->vtable_parent = (struct elf_link_hash_entry *) -1;
7940 child->vtable_parent = h;
7945 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
7948 elf_gc_record_vtentry (abfd, sec, h, addend)
7949 bfd *abfd ATTRIBUTE_UNUSED;
7950 asection *sec ATTRIBUTE_UNUSED;
7951 struct elf_link_hash_entry *h;
7954 struct elf_backend_data *bed = get_elf_backend_data (abfd);
7955 int file_align = bed->s->file_align;
7957 if (addend >= h->vtable_entries_size)
7960 boolean *ptr = h->vtable_entries_used;
7962 /* While the symbol is undefined, we have to be prepared to handle
7964 if (h->root.type == bfd_link_hash_undefined)
7971 /* Oops! We've got a reference past the defined end of
7972 the table. This is probably a bug -- shall we warn? */
7977 /* Allocate one extra entry for use as a "done" flag for the
7978 consolidation pass. */
7979 bytes = (size / file_align + 1) * sizeof (boolean);
7983 ptr = bfd_realloc (ptr - 1, (bfd_size_type) bytes);
7989 oldbytes = ((h->vtable_entries_size / file_align + 1)
7990 * sizeof (boolean));
7991 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
7995 ptr = bfd_zmalloc ((bfd_size_type) bytes);
8000 /* And arrange for that done flag to be at index -1. */
8001 h->vtable_entries_used = ptr + 1;
8002 h->vtable_entries_size = size;
8005 h->vtable_entries_used[addend / file_align] = true;
8010 /* And an accompanying bit to work out final got entry offsets once
8011 we're done. Should be called from final_link. */
8014 elf_gc_common_finalize_got_offsets (abfd, info)
8016 struct bfd_link_info *info;
8019 struct elf_backend_data *bed = get_elf_backend_data (abfd);
8022 /* The GOT offset is relative to the .got section, but the GOT header is
8023 put into the .got.plt section, if the backend uses it. */
8024 if (bed->want_got_plt)
8027 gotoff = bed->got_header_size;
8029 /* Do the local .got entries first. */
8030 for (i = info->input_bfds; i; i = i->link_next)
8032 bfd_signed_vma *local_got;
8033 bfd_size_type j, locsymcount;
8034 Elf_Internal_Shdr *symtab_hdr;
8036 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
8039 local_got = elf_local_got_refcounts (i);
8043 symtab_hdr = &elf_tdata (i)->symtab_hdr;
8044 if (elf_bad_symtab (i))
8045 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
8047 locsymcount = symtab_hdr->sh_info;
8049 for (j = 0; j < locsymcount; ++j)
8051 if (local_got[j] > 0)
8053 local_got[j] = gotoff;
8054 gotoff += ARCH_SIZE / 8;
8057 local_got[j] = (bfd_vma) -1;
8061 /* Then the global .got entries. .plt refcounts are handled by
8062 adjust_dynamic_symbol */
8063 elf_link_hash_traverse (elf_hash_table (info),
8064 elf_gc_allocate_got_offsets,
8069 /* We need a special top-level link routine to convert got reference counts
8070 to real got offsets. */
8073 elf_gc_allocate_got_offsets (h, offarg)
8074 struct elf_link_hash_entry *h;
8077 bfd_vma *off = (bfd_vma *) offarg;
8079 if (h->root.type == bfd_link_hash_warning)
8080 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8082 if (h->got.refcount > 0)
8084 h->got.offset = off[0];
8085 off[0] += ARCH_SIZE / 8;
8088 h->got.offset = (bfd_vma) -1;
8093 /* Many folk need no more in the way of final link than this, once
8094 got entry reference counting is enabled. */
8097 elf_gc_common_final_link (abfd, info)
8099 struct bfd_link_info *info;
8101 if (!elf_gc_common_finalize_got_offsets (abfd, info))
8104 /* Invoke the regular ELF backend linker to do all the work. */
8105 return elf_bfd_final_link (abfd, info);
8108 /* This function will be called though elf_link_hash_traverse to store
8109 all hash value of the exported symbols in an array. */
8112 elf_collect_hash_codes (h, data)
8113 struct elf_link_hash_entry *h;
8116 unsigned long **valuep = (unsigned long **) data;
8122 if (h->root.type == bfd_link_hash_warning)
8123 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8125 /* Ignore indirect symbols. These are added by the versioning code. */
8126 if (h->dynindx == -1)
8129 name = h->root.root.string;
8130 p = strchr (name, ELF_VER_CHR);
8133 alc = bfd_malloc ((bfd_size_type) (p - name + 1));
8134 memcpy (alc, name, (size_t) (p - name));
8135 alc[p - name] = '\0';
8139 /* Compute the hash value. */
8140 ha = bfd_elf_hash (name);
8142 /* Store the found hash value in the array given as the argument. */
8145 /* And store it in the struct so that we can put it in the hash table
8147 h->elf_hash_value = ha;
8156 elf_reloc_symbol_deleted_p (offset, cookie)
8160 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
8162 if (rcookie->bad_symtab)
8163 rcookie->rel = rcookie->rels;
8165 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
8167 unsigned long r_symndx = ELF_R_SYM (rcookie->rel->r_info);
8168 Elf_Internal_Sym isym;
8170 if (! rcookie->bad_symtab)
8171 if (rcookie->rel->r_offset > offset)
8173 if (rcookie->rel->r_offset != offset)
8176 if (rcookie->locsyms && r_symndx < rcookie->locsymcount)
8178 Elf_External_Sym *lsym;
8179 Elf_External_Sym_Shndx *lshndx;
8181 lsym = (Elf_External_Sym *) rcookie->locsyms + r_symndx;
8182 lshndx = (Elf_External_Sym_Shndx *) rcookie->locsym_shndx;
8185 elf_swap_symbol_in (rcookie->abfd, lsym, lshndx, &isym);
8188 if (r_symndx >= rcookie->locsymcount
8189 || (rcookie->locsyms
8190 && ELF_ST_BIND (isym.st_info) != STB_LOCAL))
8192 struct elf_link_hash_entry *h;
8194 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
8196 while (h->root.type == bfd_link_hash_indirect
8197 || h->root.type == bfd_link_hash_warning)
8198 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8200 if ((h->root.type == bfd_link_hash_defined
8201 || h->root.type == bfd_link_hash_defweak)
8202 && elf_discarded_section (h->root.u.def.section))
8207 else if (rcookie->locsyms)
8209 /* It's not a relocation against a global symbol,
8210 but it could be a relocation against a local
8211 symbol for a discarded section. */
8214 /* Need to: get the symbol; get the section. */
8215 if (isym.st_shndx < SHN_LORESERVE || isym.st_shndx > SHN_HIRESERVE)
8217 isec = section_from_elf_index (rcookie->abfd, isym.st_shndx);
8218 if (isec != NULL && elf_discarded_section (isec))
8227 /* Discard unneeded references to discarded sections.
8228 Returns true if any section's size was changed. */
8229 /* This function assumes that the relocations are in sorted order,
8230 which is true for all known assemblers. */
8233 elf_bfd_discard_info (output_bfd, info)
8235 struct bfd_link_info *info;
8237 struct elf_reloc_cookie cookie;
8238 asection *stab, *eh, *ehdr;
8239 Elf_Internal_Shdr *symtab_hdr;
8240 Elf_Internal_Shdr *shndx_hdr;
8241 Elf_External_Sym *freesyms;
8242 struct elf_backend_data *bed;
8244 boolean ret = false;
8245 boolean strip = info->strip == strip_all || info->strip == strip_debugger;
8247 if (info->relocateable
8248 || info->traditional_format
8249 || info->hash->creator->flavour != bfd_target_elf_flavour
8250 || ! is_elf_hash_table (info))
8254 if (elf_hash_table (info)->dynobj != NULL)
8255 ehdr = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
8258 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
8260 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
8263 bed = get_elf_backend_data (abfd);
8265 if ((abfd->flags & DYNAMIC) != 0)
8271 eh = bfd_get_section_by_name (abfd, ".eh_frame");
8272 if (eh && eh->_raw_size == 0)
8276 stab = strip ? NULL : bfd_get_section_by_name (abfd, ".stab");
8278 || elf_section_data(stab)->sec_info_type != ELF_INFO_TYPE_STABS)
8280 && (strip || ! bed->elf_backend_discard_info))
8283 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8284 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
8287 cookie.sym_hashes = elf_sym_hashes (abfd);
8288 cookie.bad_symtab = elf_bad_symtab (abfd);
8289 if (cookie.bad_symtab)
8291 cookie.locsymcount =
8292 symtab_hdr->sh_size / sizeof (Elf_External_Sym);
8293 cookie.extsymoff = 0;
8297 cookie.locsymcount = symtab_hdr->sh_info;
8298 cookie.extsymoff = symtab_hdr->sh_info;
8302 if (symtab_hdr->contents)
8303 cookie.locsyms = (void *) symtab_hdr->contents;
8304 else if (cookie.locsymcount == 0)
8305 cookie.locsyms = NULL;
8308 bfd_size_type amt = cookie.locsymcount * sizeof (Elf_External_Sym);
8309 cookie.locsyms = bfd_malloc (amt);
8310 if (cookie.locsyms == NULL)
8312 freesyms = cookie.locsyms;
8313 if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
8314 || bfd_bread (cookie.locsyms, amt, abfd) != amt)
8317 free (cookie.locsyms);
8322 cookie.locsym_shndx = NULL;
8323 if (shndx_hdr->sh_size != 0 && cookie.locsymcount != 0)
8326 amt = cookie.locsymcount * sizeof (Elf_External_Sym_Shndx);
8327 cookie.locsym_shndx = bfd_malloc (amt);
8328 if (cookie.locsym_shndx == NULL)
8329 goto error_ret_free_loc;
8330 if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0
8331 || bfd_bread (cookie.locsym_shndx, amt, abfd) != amt)
8333 free (cookie.locsym_shndx);
8334 goto error_ret_free_loc;
8340 cookie.rels = (NAME(_bfd_elf,link_read_relocs)
8341 (abfd, stab, (PTR) NULL,
8342 (Elf_Internal_Rela *) NULL,
8343 info->keep_memory));
8346 cookie.rel = cookie.rels;
8348 cookie.rels + stab->reloc_count * bed->s->int_rels_per_ext_rel;
8349 if (_bfd_discard_section_stabs (abfd, stab,
8350 elf_section_data (stab)->sec_info,
8351 elf_reloc_symbol_deleted_p,
8354 if (! info->keep_memory)
8363 cookie.relend = NULL;
8364 if (eh->reloc_count)
8365 cookie.rels = (NAME(_bfd_elf,link_read_relocs)
8366 (abfd, eh, (PTR) NULL, (Elf_Internal_Rela *) NULL,
8367 info->keep_memory));
8370 cookie.rel = cookie.rels;
8372 cookie.rels + eh->reloc_count * bed->s->int_rels_per_ext_rel;
8374 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh, ehdr,
8375 elf_reloc_symbol_deleted_p,
8378 if (! info->keep_memory)
8382 if (bed->elf_backend_discard_info)
8384 if (bed->elf_backend_discard_info (abfd, &cookie, info))
8388 if (cookie.locsym_shndx != NULL)
8389 free (cookie.locsym_shndx);
8391 if (freesyms != NULL)
8395 if (ehdr && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info, ehdr))
8401 elf_section_ignore_discarded_relocs (sec)
8404 struct elf_backend_data *bed;
8406 switch (elf_section_data (sec)->sec_info_type)
8408 case ELF_INFO_TYPE_STABS:
8409 case ELF_INFO_TYPE_EH_FRAME:
8415 bed = get_elf_backend_data (sec->owner);
8416 if (bed->elf_backend_ignore_discarded_relocs != NULL
8417 && (*bed->elf_backend_ignore_discarded_relocs) (sec))