2 Copyright 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 /* This struct is used to pass information to routines called via
23 elf_link_hash_traverse which must return failure. */
25 struct elf_info_failed
28 struct bfd_link_info *info;
31 static boolean elf_link_add_object_symbols
32 PARAMS ((bfd *, struct bfd_link_info *));
33 static boolean elf_link_add_archive_symbols
34 PARAMS ((bfd *, struct bfd_link_info *));
35 static boolean elf_merge_symbol
36 PARAMS ((bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
37 asection **, bfd_vma *, struct elf_link_hash_entry **,
38 boolean *, boolean *, boolean *));
39 static boolean elf_export_symbol
40 PARAMS ((struct elf_link_hash_entry *, PTR));
41 static boolean elf_fix_symbol_flags
42 PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *));
43 static boolean elf_adjust_dynamic_symbol
44 PARAMS ((struct elf_link_hash_entry *, PTR));
45 static boolean elf_link_find_version_dependencies
46 PARAMS ((struct elf_link_hash_entry *, PTR));
47 static boolean elf_link_find_version_dependencies
48 PARAMS ((struct elf_link_hash_entry *, PTR));
49 static boolean elf_link_assign_sym_version
50 PARAMS ((struct elf_link_hash_entry *, PTR));
51 static boolean elf_collect_hash_codes
52 PARAMS ((struct elf_link_hash_entry *, PTR));
53 static boolean elf_link_read_relocs_from_section
54 PARAMS ((bfd *, Elf_Internal_Shdr *, PTR, Elf_Internal_Rela *));
55 static void elf_link_output_relocs
56 PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *));
57 static boolean elf_link_size_reloc_section
58 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
59 static void elf_link_adjust_relocs
60 PARAMS ((bfd *, Elf_Internal_Shdr *, unsigned int,
61 struct elf_link_hash_entry **));
63 /* Given an ELF BFD, add symbols to the global hash table as
67 elf_bfd_link_add_symbols (abfd, info)
69 struct bfd_link_info *info;
71 switch (bfd_get_format (abfd))
74 return elf_link_add_object_symbols (abfd, info);
76 return elf_link_add_archive_symbols (abfd, info);
78 bfd_set_error (bfd_error_wrong_format);
83 /* Return true iff this is a non-common definition of a symbol. */
85 is_global_symbol_definition (abfd, sym)
87 Elf_Internal_Sym * sym;
89 /* Local symbols do not count, but target specific ones might. */
90 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
91 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
94 /* If the section is undefined, then so is the symbol. */
95 if (sym->st_shndx == SHN_UNDEF)
98 /* If the symbol is defined in the common section, then
99 it is a common definition and so does not count. */
100 if (sym->st_shndx == SHN_COMMON)
103 /* If the symbol is in a target specific section then we
104 must rely upon the backend to tell us what it is. */
105 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
106 /* FIXME - this function is not coded yet:
108 return _bfd_is_global_symbol_definition (abfd, sym);
110 Instead for now assume that the definition is not global,
111 Even if this is wrong, at least the linker will behave
112 in the same way that it used to do. */
119 /* Search the symbol table of the archive element of the archive ABFD
120 whoes archove map contains a mention of SYMDEF, and determine if
121 the symbol is defined in this element. */
123 elf_link_is_defined_archive_symbol (abfd, symdef)
127 Elf_Internal_Shdr * hdr;
128 Elf_External_Sym * esym;
129 Elf_External_Sym * esymend;
130 Elf_External_Sym * buf = NULL;
134 boolean result = false;
136 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
137 if (abfd == (bfd *) NULL)
140 if (! bfd_check_format (abfd, bfd_object))
143 /* If we have already included the element containing this symbol in the
144 link then we do not need to include it again. Just claim that any symbol
145 it contains is not a definition, so that our caller will not decide to
146 (re)include this element. */
147 if (abfd->archive_pass)
150 /* Select the appropriate symbol table. */
151 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
152 hdr = &elf_tdata (abfd)->symtab_hdr;
154 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
156 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
158 /* The sh_info field of the symtab header tells us where the
159 external symbols start. We don't care about the local symbols. */
160 if (elf_bad_symtab (abfd))
162 extsymcount = symcount;
167 extsymcount = symcount - hdr->sh_info;
168 extsymoff = hdr->sh_info;
171 buf = ((Elf_External_Sym *)
172 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
173 if (buf == NULL && extsymcount != 0)
176 /* Read in the symbol table.
177 FIXME: This ought to be cached somewhere. */
179 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
181 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
182 != extsymcount * sizeof (Elf_External_Sym)))
188 /* Scan the symbol table looking for SYMDEF. */
189 esymend = buf + extsymcount;
194 Elf_Internal_Sym sym;
197 elf_swap_symbol_in (abfd, esym, & sym);
199 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
200 if (name == (const char *) NULL)
203 if (strcmp (name, symdef->name) == 0)
205 result = is_global_symbol_definition (abfd, & sym);
216 /* Add symbols from an ELF archive file to the linker hash table. We
217 don't use _bfd_generic_link_add_archive_symbols because of a
218 problem which arises on UnixWare. The UnixWare libc.so is an
219 archive which includes an entry libc.so.1 which defines a bunch of
220 symbols. The libc.so archive also includes a number of other
221 object files, which also define symbols, some of which are the same
222 as those defined in libc.so.1. Correct linking requires that we
223 consider each object file in turn, and include it if it defines any
224 symbols we need. _bfd_generic_link_add_archive_symbols does not do
225 this; it looks through the list of undefined symbols, and includes
226 any object file which defines them. When this algorithm is used on
227 UnixWare, it winds up pulling in libc.so.1 early and defining a
228 bunch of symbols. This means that some of the other objects in the
229 archive are not included in the link, which is incorrect since they
230 precede libc.so.1 in the archive.
232 Fortunately, ELF archive handling is simpler than that done by
233 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
234 oddities. In ELF, if we find a symbol in the archive map, and the
235 symbol is currently undefined, we know that we must pull in that
238 Unfortunately, we do have to make multiple passes over the symbol
239 table until nothing further is resolved. */
242 elf_link_add_archive_symbols (abfd, info)
244 struct bfd_link_info *info;
247 boolean *defined = NULL;
248 boolean *included = NULL;
252 if (! bfd_has_map (abfd))
254 /* An empty archive is a special case. */
255 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
257 bfd_set_error (bfd_error_no_armap);
261 /* Keep track of all symbols we know to be already defined, and all
262 files we know to be already included. This is to speed up the
263 second and subsequent passes. */
264 c = bfd_ardata (abfd)->symdef_count;
267 defined = (boolean *) bfd_malloc (c * sizeof (boolean));
268 included = (boolean *) bfd_malloc (c * sizeof (boolean));
269 if (defined == (boolean *) NULL || included == (boolean *) NULL)
271 memset (defined, 0, c * sizeof (boolean));
272 memset (included, 0, c * sizeof (boolean));
274 symdefs = bfd_ardata (abfd)->symdefs;
287 symdefend = symdef + c;
288 for (i = 0; symdef < symdefend; symdef++, i++)
290 struct elf_link_hash_entry *h;
292 struct bfd_link_hash_entry *undefs_tail;
295 if (defined[i] || included[i])
297 if (symdef->file_offset == last)
303 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
304 false, false, false);
310 /* If this is a default version (the name contains @@),
311 look up the symbol again without the version. The
312 effect is that references to the symbol without the
313 version will be matched by the default symbol in the
316 p = strchr (symdef->name, ELF_VER_CHR);
317 if (p == NULL || p[1] != ELF_VER_CHR)
320 copy = bfd_alloc (abfd, p - symdef->name + 1);
323 memcpy (copy, symdef->name, p - symdef->name);
324 copy[p - symdef->name] = '\0';
326 h = elf_link_hash_lookup (elf_hash_table (info), copy,
327 false, false, false);
329 bfd_release (abfd, copy);
335 if (h->root.type == bfd_link_hash_common)
337 /* We currently have a common symbol. The archive map contains
338 a reference to this symbol, so we may want to include it. We
339 only want to include it however, if this archive element
340 contains a definition of the symbol, not just another common
343 Unfortunately some archivers (including GNU ar) will put
344 declarations of common symbols into their archive maps, as
345 well as real definitions, so we cannot just go by the archive
346 map alone. Instead we must read in the element's symbol
347 table and check that to see what kind of symbol definition
349 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
352 else if (h->root.type != bfd_link_hash_undefined)
354 if (h->root.type != bfd_link_hash_undefweak)
359 /* We need to include this archive member. */
361 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
362 if (element == (bfd *) NULL)
365 if (! bfd_check_format (element, bfd_object))
368 /* Doublecheck that we have not included this object
369 already--it should be impossible, but there may be
370 something wrong with the archive. */
371 if (element->archive_pass != 0)
373 bfd_set_error (bfd_error_bad_value);
376 element->archive_pass = 1;
378 undefs_tail = info->hash->undefs_tail;
380 if (! (*info->callbacks->add_archive_element) (info, element,
383 if (! elf_link_add_object_symbols (element, info))
386 /* If there are any new undefined symbols, we need to make
387 another pass through the archive in order to see whether
388 they can be defined. FIXME: This isn't perfect, because
389 common symbols wind up on undefs_tail and because an
390 undefined symbol which is defined later on in this pass
391 does not require another pass. This isn't a bug, but it
392 does make the code less efficient than it could be. */
393 if (undefs_tail != info->hash->undefs_tail)
396 /* Look backward to mark all symbols from this object file
397 which we have already seen in this pass. */
401 included[mark] = true;
406 while (symdefs[mark].file_offset == symdef->file_offset);
408 /* We mark subsequent symbols from this object file as we go
409 on through the loop. */
410 last = symdef->file_offset;
421 if (defined != (boolean *) NULL)
423 if (included != (boolean *) NULL)
428 /* This function is called when we want to define a new symbol. It
429 handles the various cases which arise when we find a definition in
430 a dynamic object, or when there is already a definition in a
431 dynamic object. The new symbol is described by NAME, SYM, PSEC,
432 and PVALUE. We set SYM_HASH to the hash table entry. We set
433 OVERRIDE if the old symbol is overriding a new definition. We set
434 TYPE_CHANGE_OK if it is OK for the type to change. We set
435 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
436 change, we mean that we shouldn't warn if the type or size does
440 elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash,
441 override, type_change_ok, size_change_ok)
443 struct bfd_link_info *info;
445 Elf_Internal_Sym *sym;
448 struct elf_link_hash_entry **sym_hash;
450 boolean *type_change_ok;
451 boolean *size_change_ok;
454 struct elf_link_hash_entry *h;
457 boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
462 bind = ELF_ST_BIND (sym->st_info);
464 if (! bfd_is_und_section (sec))
465 h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false);
467 h = ((struct elf_link_hash_entry *)
468 bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false));
473 /* This code is for coping with dynamic objects, and is only useful
474 if we are doing an ELF link. */
475 if (info->hash->creator != abfd->xvec)
478 /* For merging, we only care about real symbols. */
480 while (h->root.type == bfd_link_hash_indirect
481 || h->root.type == bfd_link_hash_warning)
482 h = (struct elf_link_hash_entry *) h->root.u.i.link;
484 /* If we just created the symbol, mark it as being an ELF symbol.
485 Other than that, there is nothing to do--there is no merge issue
486 with a newly defined symbol--so we just return. */
488 if (h->root.type == bfd_link_hash_new)
490 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
494 /* OLDBFD is a BFD associated with the existing symbol. */
496 switch (h->root.type)
502 case bfd_link_hash_undefined:
503 case bfd_link_hash_undefweak:
504 oldbfd = h->root.u.undef.abfd;
507 case bfd_link_hash_defined:
508 case bfd_link_hash_defweak:
509 oldbfd = h->root.u.def.section->owner;
512 case bfd_link_hash_common:
513 oldbfd = h->root.u.c.p->section->owner;
517 /* In cases involving weak versioned symbols, we may wind up trying
518 to merge a symbol with itself. Catch that here, to avoid the
519 confusion that results if we try to override a symbol with
520 itself. The additional tests catch cases like
521 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
522 dynamic object, which we do want to handle here. */
524 && ((abfd->flags & DYNAMIC) == 0
525 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))
528 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
529 respectively, is from a dynamic object. */
531 if ((abfd->flags & DYNAMIC) != 0)
537 olddyn = (oldbfd->flags & DYNAMIC) != 0;
542 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
543 indices used by MIPS ELF. */
544 switch (h->root.type)
550 case bfd_link_hash_defined:
551 case bfd_link_hash_defweak:
552 hsec = h->root.u.def.section;
555 case bfd_link_hash_common:
556 hsec = h->root.u.c.p->section;
563 olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0;
566 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
567 respectively, appear to be a definition rather than reference. */
569 if (bfd_is_und_section (sec) || bfd_is_com_section (sec))
574 if (h->root.type == bfd_link_hash_undefined
575 || h->root.type == bfd_link_hash_undefweak
576 || h->root.type == bfd_link_hash_common)
581 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
582 symbol, respectively, appears to be a common symbol in a dynamic
583 object. If a symbol appears in an uninitialized section, and is
584 not weak, and is not a function, then it may be a common symbol
585 which was resolved when the dynamic object was created. We want
586 to treat such symbols specially, because they raise special
587 considerations when setting the symbol size: if the symbol
588 appears as a common symbol in a regular object, and the size in
589 the regular object is larger, we must make sure that we use the
590 larger size. This problematic case can always be avoided in C,
591 but it must be handled correctly when using Fortran shared
594 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
595 likewise for OLDDYNCOMMON and OLDDEF.
597 Note that this test is just a heuristic, and that it is quite
598 possible to have an uninitialized symbol in a shared object which
599 is really a definition, rather than a common symbol. This could
600 lead to some minor confusion when the symbol really is a common
601 symbol in some regular object. However, I think it will be
606 && (sec->flags & SEC_ALLOC) != 0
607 && (sec->flags & SEC_LOAD) == 0
610 && ELF_ST_TYPE (sym->st_info) != STT_FUNC)
613 newdyncommon = false;
617 && h->root.type == bfd_link_hash_defined
618 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
619 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
620 && (h->root.u.def.section->flags & SEC_LOAD) == 0
622 && h->type != STT_FUNC)
625 olddyncommon = false;
627 /* It's OK to change the type if either the existing symbol or the
628 new symbol is weak. */
630 if (h->root.type == bfd_link_hash_defweak
631 || h->root.type == bfd_link_hash_undefweak
633 *type_change_ok = true;
635 /* It's OK to change the size if either the existing symbol or the
636 new symbol is weak, or if the old symbol is undefined. */
639 || h->root.type == bfd_link_hash_undefined)
640 *size_change_ok = true;
642 /* If both the old and the new symbols look like common symbols in a
643 dynamic object, set the size of the symbol to the larger of the
648 && sym->st_size != h->size)
650 /* Since we think we have two common symbols, issue a multiple
651 common warning if desired. Note that we only warn if the
652 size is different. If the size is the same, we simply let
653 the old symbol override the new one as normally happens with
654 symbols defined in dynamic objects. */
656 if (! ((*info->callbacks->multiple_common)
657 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
658 h->size, abfd, bfd_link_hash_common, sym->st_size)))
661 if (sym->st_size > h->size)
662 h->size = sym->st_size;
664 *size_change_ok = true;
667 /* If we are looking at a dynamic object, and we have found a
668 definition, we need to see if the symbol was already defined by
669 some other object. If so, we want to use the existing
670 definition, and we do not want to report a multiple symbol
671 definition error; we do this by clobbering *PSEC to be
674 We treat a common symbol as a definition if the symbol in the
675 shared library is a function, since common symbols always
676 represent variables; this can cause confusion in principle, but
677 any such confusion would seem to indicate an erroneous program or
678 shared library. We also permit a common symbol in a regular
679 object to override a weak symbol in a shared object.
681 We prefer a non-weak definition in a shared library to a weak
682 definition in the executable. */
687 || (h->root.type == bfd_link_hash_common
689 || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))
690 && (h->root.type != bfd_link_hash_defweak
691 || bind == STB_WEAK))
695 newdyncommon = false;
697 *psec = sec = bfd_und_section_ptr;
698 *size_change_ok = true;
700 /* If we get here when the old symbol is a common symbol, then
701 we are explicitly letting it override a weak symbol or
702 function in a dynamic object, and we don't want to warn about
703 a type change. If the old symbol is a defined symbol, a type
704 change warning may still be appropriate. */
706 if (h->root.type == bfd_link_hash_common)
707 *type_change_ok = true;
710 /* Handle the special case of an old common symbol merging with a
711 new symbol which looks like a common symbol in a shared object.
712 We change *PSEC and *PVALUE to make the new symbol look like a
713 common symbol, and let _bfd_generic_link_add_one_symbol will do
717 && h->root.type == bfd_link_hash_common)
721 newdyncommon = false;
722 *pvalue = sym->st_size;
723 *psec = sec = bfd_com_section_ptr;
724 *size_change_ok = true;
727 /* If the old symbol is from a dynamic object, and the new symbol is
728 a definition which is not from a dynamic object, then the new
729 symbol overrides the old symbol. Symbols from regular files
730 always take precedence over symbols from dynamic objects, even if
731 they are defined after the dynamic object in the link.
733 As above, we again permit a common symbol in a regular object to
734 override a definition in a shared object if the shared object
735 symbol is a function or is weak.
737 As above, we permit a non-weak definition in a shared object to
738 override a weak definition in a regular object. */
742 || (bfd_is_com_section (sec)
743 && (h->root.type == bfd_link_hash_defweak
744 || h->type == STT_FUNC)))
747 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
749 || h->root.type == bfd_link_hash_defweak))
751 /* Change the hash table entry to undefined, and let
752 _bfd_generic_link_add_one_symbol do the right thing with the
755 h->root.type = bfd_link_hash_undefined;
756 h->root.u.undef.abfd = h->root.u.def.section->owner;
757 *size_change_ok = true;
760 olddyncommon = false;
762 /* We again permit a type change when a common symbol may be
763 overriding a function. */
765 if (bfd_is_com_section (sec))
766 *type_change_ok = true;
768 /* This union may have been set to be non-NULL when this symbol
769 was seen in a dynamic object. We must force the union to be
770 NULL, so that it is correct for a regular symbol. */
772 h->verinfo.vertree = NULL;
774 /* In this special case, if H is the target of an indirection,
775 we want the caller to frob with H rather than with the
776 indirect symbol. That will permit the caller to redefine the
777 target of the indirection, rather than the indirect symbol
778 itself. FIXME: This will break the -y option if we store a
779 symbol with a different name. */
783 /* Handle the special case of a new common symbol merging with an
784 old symbol that looks like it might be a common symbol defined in
785 a shared object. Note that we have already handled the case in
786 which a new common symbol should simply override the definition
787 in the shared library. */
790 && bfd_is_com_section (sec)
793 /* It would be best if we could set the hash table entry to a
794 common symbol, but we don't know what to use for the section
796 if (! ((*info->callbacks->multiple_common)
797 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
798 h->size, abfd, bfd_link_hash_common, sym->st_size)))
801 /* If the predumed common symbol in the dynamic object is
802 larger, pretend that the new symbol has its size. */
804 if (h->size > *pvalue)
807 /* FIXME: We no longer know the alignment required by the symbol
808 in the dynamic object, so we just wind up using the one from
809 the regular object. */
812 olddyncommon = false;
814 h->root.type = bfd_link_hash_undefined;
815 h->root.u.undef.abfd = h->root.u.def.section->owner;
817 *size_change_ok = true;
818 *type_change_ok = true;
820 h->verinfo.vertree = NULL;
823 /* Handle the special case of a weak definition in a regular object
824 followed by a non-weak definition in a shared object. In this
825 case, we prefer the definition in the shared object. */
827 && h->root.type == bfd_link_hash_defweak
832 /* To make this work we have to frob the flags so that the rest
833 of the code does not think we are using the regular
835 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
836 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
837 else if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)
838 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
839 h->elf_link_hash_flags &= ~ (ELF_LINK_HASH_DEF_REGULAR
840 | ELF_LINK_HASH_DEF_DYNAMIC);
842 /* If H is the target of an indirection, we want the caller to
843 use H rather than the indirect symbol. Otherwise if we are
844 defining a new indirect symbol we will wind up attaching it
845 to the entry we are overriding. */
849 /* Handle the special case of a non-weak definition in a shared
850 object followed by a weak definition in a regular object. In
851 this case we prefer to definition in the shared object. To make
852 this work we have to tell the caller to not treat the new symbol
856 && h->root.type != bfd_link_hash_defweak
865 /* Add symbols from an ELF object file to the linker hash table. */
868 elf_link_add_object_symbols (abfd, info)
870 struct bfd_link_info *info;
872 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
873 const Elf_Internal_Sym *,
874 const char **, flagword *,
875 asection **, bfd_vma *));
876 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
877 asection *, const Elf_Internal_Rela *));
879 Elf_Internal_Shdr *hdr;
883 Elf_External_Sym *buf = NULL;
884 struct elf_link_hash_entry **sym_hash;
886 bfd_byte *dynver = NULL;
887 Elf_External_Versym *extversym = NULL;
888 Elf_External_Versym *ever;
889 Elf_External_Dyn *dynbuf = NULL;
890 struct elf_link_hash_entry *weaks;
891 Elf_External_Sym *esym;
892 Elf_External_Sym *esymend;
894 add_symbol_hook = get_elf_backend_data (abfd)->elf_add_symbol_hook;
895 collect = get_elf_backend_data (abfd)->collect;
897 if ((abfd->flags & DYNAMIC) == 0)
903 /* You can't use -r against a dynamic object. Also, there's no
904 hope of using a dynamic object which does not exactly match
905 the format of the output file. */
906 if (info->relocateable || info->hash->creator != abfd->xvec)
908 bfd_set_error (bfd_error_invalid_operation);
913 /* As a GNU extension, any input sections which are named
914 .gnu.warning.SYMBOL are treated as warning symbols for the given
915 symbol. This differs from .gnu.warning sections, which generate
916 warnings when they are included in an output file. */
921 for (s = abfd->sections; s != NULL; s = s->next)
925 name = bfd_get_section_name (abfd, s);
926 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
931 name += sizeof ".gnu.warning." - 1;
933 /* If this is a shared object, then look up the symbol
934 in the hash table. If it is there, and it is already
935 been defined, then we will not be using the entry
936 from this shared object, so we don't need to warn.
937 FIXME: If we see the definition in a regular object
938 later on, we will warn, but we shouldn't. The only
939 fix is to keep track of what warnings we are supposed
940 to emit, and then handle them all at the end of the
942 if (dynamic && abfd->xvec == info->hash->creator)
944 struct elf_link_hash_entry *h;
946 h = elf_link_hash_lookup (elf_hash_table (info), name,
949 /* FIXME: What about bfd_link_hash_common? */
951 && (h->root.type == bfd_link_hash_defined
952 || h->root.type == bfd_link_hash_defweak))
954 /* We don't want to issue this warning. Clobber
955 the section size so that the warning does not
956 get copied into the output file. */
962 sz = bfd_section_size (abfd, s);
963 msg = (char *) bfd_alloc (abfd, sz + 1);
967 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
972 if (! (_bfd_generic_link_add_one_symbol
973 (info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg,
974 false, collect, (struct bfd_link_hash_entry **) NULL)))
977 if (! info->relocateable)
979 /* Clobber the section size so that the warning does
980 not get copied into the output file. */
987 /* If this is a dynamic object, we always link against the .dynsym
988 symbol table, not the .symtab symbol table. The dynamic linker
989 will only see the .dynsym symbol table, so there is no reason to
990 look at .symtab for a dynamic object. */
992 if (! dynamic || elf_dynsymtab (abfd) == 0)
993 hdr = &elf_tdata (abfd)->symtab_hdr;
995 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
999 /* Read in any version definitions. */
1001 if (! _bfd_elf_slurp_version_tables (abfd))
1004 /* Read in the symbol versions, but don't bother to convert them
1005 to internal format. */
1006 if (elf_dynversym (abfd) != 0)
1008 Elf_Internal_Shdr *versymhdr;
1010 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
1011 extversym = (Elf_External_Versym *) bfd_malloc (hdr->sh_size);
1012 if (extversym == NULL)
1014 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
1015 || (bfd_read ((PTR) extversym, 1, versymhdr->sh_size, abfd)
1016 != versymhdr->sh_size))
1021 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1023 /* The sh_info field of the symtab header tells us where the
1024 external symbols start. We don't care about the local symbols at
1026 if (elf_bad_symtab (abfd))
1028 extsymcount = symcount;
1033 extsymcount = symcount - hdr->sh_info;
1034 extsymoff = hdr->sh_info;
1037 buf = ((Elf_External_Sym *)
1038 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
1039 if (buf == NULL && extsymcount != 0)
1042 /* We store a pointer to the hash table entry for each external
1044 sym_hash = ((struct elf_link_hash_entry **)
1046 extsymcount * sizeof (struct elf_link_hash_entry *)));
1047 if (sym_hash == NULL)
1049 elf_sym_hashes (abfd) = sym_hash;
1053 /* If we are creating a shared library, create all the dynamic
1054 sections immediately. We need to attach them to something,
1055 so we attach them to this BFD, provided it is the right
1056 format. FIXME: If there are no input BFD's of the same
1057 format as the output, we can't make a shared library. */
1059 && ! elf_hash_table (info)->dynamic_sections_created
1060 && abfd->xvec == info->hash->creator)
1062 if (! elf_link_create_dynamic_sections (abfd, info))
1071 bfd_size_type oldsize;
1072 bfd_size_type strindex;
1074 /* Find the name to use in a DT_NEEDED entry that refers to this
1075 object. If the object has a DT_SONAME entry, we use it.
1076 Otherwise, if the generic linker stuck something in
1077 elf_dt_name, we use that. Otherwise, we just use the file
1078 name. If the generic linker put a null string into
1079 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1080 there is a DT_SONAME entry. */
1082 name = bfd_get_filename (abfd);
1083 if (elf_dt_name (abfd) != NULL)
1085 name = elf_dt_name (abfd);
1089 s = bfd_get_section_by_name (abfd, ".dynamic");
1092 Elf_External_Dyn *extdyn;
1093 Elf_External_Dyn *extdynend;
1097 dynbuf = (Elf_External_Dyn *) bfd_malloc ((size_t) s->_raw_size);
1101 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
1102 (file_ptr) 0, s->_raw_size))
1105 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1108 link = elf_elfsections (abfd)[elfsec]->sh_link;
1111 /* The shared libraries distributed with hpux11 have a bogus
1112 sh_link field for the ".dynamic" section. This code detects
1113 when LINK refers to a section that is not a string table and
1114 tries to find the string table for the ".dynsym" section
1116 Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[link];
1117 if (hdr->sh_type != SHT_STRTAB)
1119 asection *s = bfd_get_section_by_name (abfd, ".dynsym");
1120 int elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1123 link = elf_elfsections (abfd)[elfsec]->sh_link;
1128 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
1129 for (; extdyn < extdynend; extdyn++)
1131 Elf_Internal_Dyn dyn;
1133 elf_swap_dyn_in (abfd, extdyn, &dyn);
1134 if (dyn.d_tag == DT_SONAME)
1136 name = bfd_elf_string_from_elf_section (abfd, link,
1141 if (dyn.d_tag == DT_NEEDED)
1143 struct bfd_link_needed_list *n, **pn;
1146 n = ((struct bfd_link_needed_list *)
1147 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1148 fnm = bfd_elf_string_from_elf_section (abfd, link,
1150 if (n == NULL || fnm == NULL)
1152 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1159 for (pn = &elf_hash_table (info)->needed;
1171 /* We do not want to include any of the sections in a dynamic
1172 object in the output file. We hack by simply clobbering the
1173 list of sections in the BFD. This could be handled more
1174 cleanly by, say, a new section flag; the existing
1175 SEC_NEVER_LOAD flag is not the one we want, because that one
1176 still implies that the section takes up space in the output
1178 abfd->sections = NULL;
1179 abfd->section_count = 0;
1181 /* If this is the first dynamic object found in the link, create
1182 the special sections required for dynamic linking. */
1183 if (! elf_hash_table (info)->dynamic_sections_created)
1185 if (! elf_link_create_dynamic_sections (abfd, info))
1191 /* Add a DT_NEEDED entry for this dynamic object. */
1192 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1193 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr, name,
1195 if (strindex == (bfd_size_type) -1)
1198 if (oldsize == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
1201 Elf_External_Dyn *dyncon, *dynconend;
1203 /* The hash table size did not change, which means that
1204 the dynamic object name was already entered. If we
1205 have already included this dynamic object in the
1206 link, just ignore it. There is no reason to include
1207 a particular dynamic object more than once. */
1208 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
1210 BFD_ASSERT (sdyn != NULL);
1212 dyncon = (Elf_External_Dyn *) sdyn->contents;
1213 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1215 for (; dyncon < dynconend; dyncon++)
1217 Elf_Internal_Dyn dyn;
1219 elf_swap_dyn_in (elf_hash_table (info)->dynobj, dyncon,
1221 if (dyn.d_tag == DT_NEEDED
1222 && dyn.d_un.d_val == strindex)
1226 if (extversym != NULL)
1233 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
1237 /* Save the SONAME, if there is one, because sometimes the
1238 linker emulation code will need to know it. */
1240 name = bfd_get_filename (abfd);
1241 elf_dt_name (abfd) = name;
1245 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
1247 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
1248 != extsymcount * sizeof (Elf_External_Sym)))
1253 ever = extversym != NULL ? extversym + extsymoff : NULL;
1254 esymend = buf + extsymcount;
1257 esym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
1259 Elf_Internal_Sym sym;
1265 struct elf_link_hash_entry *h;
1267 boolean size_change_ok, type_change_ok;
1268 boolean new_weakdef;
1269 unsigned int old_alignment;
1271 elf_swap_symbol_in (abfd, esym, &sym);
1273 flags = BSF_NO_FLAGS;
1275 value = sym.st_value;
1278 bind = ELF_ST_BIND (sym.st_info);
1279 if (bind == STB_LOCAL)
1281 /* This should be impossible, since ELF requires that all
1282 global symbols follow all local symbols, and that sh_info
1283 point to the first global symbol. Unfortunatealy, Irix 5
1287 else if (bind == STB_GLOBAL)
1289 if (sym.st_shndx != SHN_UNDEF
1290 && sym.st_shndx != SHN_COMMON)
1295 else if (bind == STB_WEAK)
1299 /* Leave it up to the processor backend. */
1302 if (sym.st_shndx == SHN_UNDEF)
1303 sec = bfd_und_section_ptr;
1304 else if (sym.st_shndx > 0 && sym.st_shndx < SHN_LORESERVE)
1306 sec = section_from_elf_index (abfd, sym.st_shndx);
1308 sec = bfd_abs_section_ptr;
1309 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
1312 else if (sym.st_shndx == SHN_ABS)
1313 sec = bfd_abs_section_ptr;
1314 else if (sym.st_shndx == SHN_COMMON)
1316 sec = bfd_com_section_ptr;
1317 /* What ELF calls the size we call the value. What ELF
1318 calls the value we call the alignment. */
1319 value = sym.st_size;
1323 /* Leave it up to the processor backend. */
1326 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
1327 if (name == (const char *) NULL)
1330 if (add_symbol_hook)
1332 if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
1336 /* The hook function sets the name to NULL if this symbol
1337 should be skipped for some reason. */
1338 if (name == (const char *) NULL)
1342 /* Sanity check that all possibilities were handled. */
1343 if (sec == (asection *) NULL)
1345 bfd_set_error (bfd_error_bad_value);
1349 if (bfd_is_und_section (sec)
1350 || bfd_is_com_section (sec))
1355 size_change_ok = false;
1356 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
1358 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1360 Elf_Internal_Versym iver;
1361 unsigned int vernum = 0;
1366 _bfd_elf_swap_versym_in (abfd, ever, &iver);
1367 vernum = iver.vs_vers & VERSYM_VERSION;
1369 /* If this is a hidden symbol, or if it is not version
1370 1, we append the version name to the symbol name.
1371 However, we do not modify a non-hidden absolute
1372 symbol, because it might be the version symbol
1373 itself. FIXME: What if it isn't? */
1374 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
1375 || (vernum > 1 && ! bfd_is_abs_section (sec)))
1378 int namelen, newlen;
1381 if (sym.st_shndx != SHN_UNDEF)
1383 if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
1385 (*_bfd_error_handler)
1386 (_("%s: %s: invalid version %u (max %d)"),
1387 bfd_get_filename (abfd), name, vernum,
1388 elf_tdata (abfd)->dynverdef_hdr.sh_info);
1389 bfd_set_error (bfd_error_bad_value);
1392 else if (vernum > 1)
1394 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
1400 /* We cannot simply test for the number of
1401 entries in the VERNEED section since the
1402 numbers for the needed versions do not start
1404 Elf_Internal_Verneed *t;
1407 for (t = elf_tdata (abfd)->verref;
1411 Elf_Internal_Vernaux *a;
1413 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1415 if (a->vna_other == vernum)
1417 verstr = a->vna_nodename;
1426 (*_bfd_error_handler)
1427 (_("%s: %s: invalid needed version %d"),
1428 bfd_get_filename (abfd), name, vernum);
1429 bfd_set_error (bfd_error_bad_value);
1434 namelen = strlen (name);
1435 newlen = namelen + strlen (verstr) + 2;
1436 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
1439 newname = (char *) bfd_alloc (abfd, newlen);
1440 if (newname == NULL)
1442 strcpy (newname, name);
1443 p = newname + namelen;
1445 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
1453 if (! elf_merge_symbol (abfd, info, name, &sym, &sec, &value,
1454 sym_hash, &override, &type_change_ok,
1462 while (h->root.type == bfd_link_hash_indirect
1463 || h->root.type == bfd_link_hash_warning)
1464 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1466 /* Remember the old alignment if this is a common symbol, so
1467 that we don't reduce the alignment later on. We can't
1468 check later, because _bfd_generic_link_add_one_symbol
1469 will set a default for the alignment which we want to
1471 if (h->root.type == bfd_link_hash_common)
1472 old_alignment = h->root.u.c.p->alignment_power;
1474 if (elf_tdata (abfd)->verdef != NULL
1478 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
1481 if (! (_bfd_generic_link_add_one_symbol
1482 (info, abfd, name, flags, sec, value, (const char *) NULL,
1483 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
1487 while (h->root.type == bfd_link_hash_indirect
1488 || h->root.type == bfd_link_hash_warning)
1489 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1492 new_weakdef = false;
1495 && (flags & BSF_WEAK) != 0
1496 && ELF_ST_TYPE (sym.st_info) != STT_FUNC
1497 && info->hash->creator->flavour == bfd_target_elf_flavour
1498 && h->weakdef == NULL)
1500 /* Keep a list of all weak defined non function symbols from
1501 a dynamic object, using the weakdef field. Later in this
1502 function we will set the weakdef field to the correct
1503 value. We only put non-function symbols from dynamic
1504 objects on this list, because that happens to be the only
1505 time we need to know the normal symbol corresponding to a
1506 weak symbol, and the information is time consuming to
1507 figure out. If the weakdef field is not already NULL,
1508 then this symbol was already defined by some previous
1509 dynamic object, and we will be using that previous
1510 definition anyhow. */
1517 /* Set the alignment of a common symbol. */
1518 if (sym.st_shndx == SHN_COMMON
1519 && h->root.type == bfd_link_hash_common)
1523 align = bfd_log2 (sym.st_value);
1524 if (align > old_alignment)
1525 h->root.u.c.p->alignment_power = align;
1528 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1534 /* Remember the symbol size and type. */
1535 if (sym.st_size != 0
1536 && (definition || h->size == 0))
1538 if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
1539 (*_bfd_error_handler)
1540 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1541 name, (unsigned long) h->size, (unsigned long) sym.st_size,
1542 bfd_get_filename (abfd));
1544 h->size = sym.st_size;
1547 /* If this is a common symbol, then we always want H->SIZE
1548 to be the size of the common symbol. The code just above
1549 won't fix the size if a common symbol becomes larger. We
1550 don't warn about a size change here, because that is
1551 covered by --warn-common. */
1552 if (h->root.type == bfd_link_hash_common)
1553 h->size = h->root.u.c.size;
1555 if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
1556 && (definition || h->type == STT_NOTYPE))
1558 if (h->type != STT_NOTYPE
1559 && h->type != ELF_ST_TYPE (sym.st_info)
1560 && ! type_change_ok)
1561 (*_bfd_error_handler)
1562 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1563 name, h->type, ELF_ST_TYPE (sym.st_info),
1564 bfd_get_filename (abfd));
1566 h->type = ELF_ST_TYPE (sym.st_info);
1569 if (sym.st_other != 0
1570 && (definition || h->other == 0))
1571 h->other = sym.st_other;
1573 /* Set a flag in the hash table entry indicating the type of
1574 reference or definition we just found. Keep a count of
1575 the number of dynamic symbols we find. A dynamic symbol
1576 is one which is referenced or defined by both a regular
1577 object and a shared object. */
1578 old_flags = h->elf_link_hash_flags;
1584 new_flag = ELF_LINK_HASH_REF_REGULAR;
1585 if (bind != STB_WEAK)
1586 new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK;
1589 new_flag = ELF_LINK_HASH_DEF_REGULAR;
1591 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
1592 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
1598 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
1600 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
1601 if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
1602 | ELF_LINK_HASH_REF_REGULAR)) != 0
1603 || (h->weakdef != NULL
1605 && h->weakdef->dynindx != -1))
1609 h->elf_link_hash_flags |= new_flag;
1611 /* If this symbol has a version, and it is the default
1612 version, we create an indirect symbol from the default
1613 name to the fully decorated name. This will cause
1614 external references which do not specify a version to be
1615 bound to this version of the symbol. */
1620 p = strchr (name, ELF_VER_CHR);
1621 if (p != NULL && p[1] == ELF_VER_CHR)
1624 struct elf_link_hash_entry *hi;
1627 shortname = bfd_hash_allocate (&info->hash->table,
1629 if (shortname == NULL)
1631 strncpy (shortname, name, p - name);
1632 shortname[p - name] = '\0';
1634 /* We are going to create a new symbol. Merge it
1635 with any existing symbol with this name. For the
1636 purposes of the merge, act as though we were
1637 defining the symbol we just defined, although we
1638 actually going to define an indirect symbol. */
1639 type_change_ok = false;
1640 size_change_ok = false;
1641 if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
1642 &value, &hi, &override,
1643 &type_change_ok, &size_change_ok))
1648 if (! (_bfd_generic_link_add_one_symbol
1649 (info, abfd, shortname, BSF_INDIRECT,
1650 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1651 collect, (struct bfd_link_hash_entry **) &hi)))
1656 /* In this case the symbol named SHORTNAME is
1657 overriding the indirect symbol we want to
1658 add. We were planning on making SHORTNAME an
1659 indirect symbol referring to NAME. SHORTNAME
1660 is the name without a version. NAME is the
1661 fully versioned name, and it is the default
1664 Overriding means that we already saw a
1665 definition for the symbol SHORTNAME in a
1666 regular object, and it is overriding the
1667 symbol defined in the dynamic object.
1669 When this happens, we actually want to change
1670 NAME, the symbol we just added, to refer to
1671 SHORTNAME. This will cause references to
1672 NAME in the shared object to become
1673 references to SHORTNAME in the regular
1674 object. This is what we expect when we
1675 override a function in a shared object: that
1676 the references in the shared object will be
1677 mapped to the definition in the regular
1680 while (hi->root.type == bfd_link_hash_indirect
1681 || hi->root.type == bfd_link_hash_warning)
1682 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1684 h->root.type = bfd_link_hash_indirect;
1685 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1686 if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC)
1688 h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC;
1689 hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
1690 if (hi->elf_link_hash_flags
1691 & (ELF_LINK_HASH_REF_REGULAR
1692 | ELF_LINK_HASH_DEF_REGULAR))
1694 if (! _bfd_elf_link_record_dynamic_symbol (info,
1700 /* Now set HI to H, so that the following code
1701 will set the other fields correctly. */
1705 /* If there is a duplicate definition somewhere,
1706 then HI may not point to an indirect symbol. We
1707 will have reported an error to the user in that
1710 if (hi->root.type == bfd_link_hash_indirect)
1712 struct elf_link_hash_entry *ht;
1714 /* If the symbol became indirect, then we assume
1715 that we have not seen a definition before. */
1716 BFD_ASSERT ((hi->elf_link_hash_flags
1717 & (ELF_LINK_HASH_DEF_DYNAMIC
1718 | ELF_LINK_HASH_DEF_REGULAR))
1721 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1723 /* Copy down any references that we may have
1724 already seen to the symbol which just became
1726 ht->elf_link_hash_flags |=
1727 (hi->elf_link_hash_flags
1728 & (ELF_LINK_HASH_REF_DYNAMIC
1729 | ELF_LINK_HASH_REF_REGULAR
1730 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
1731 | ELF_LINK_NON_GOT_REF));
1733 /* Copy over the global and procedure linkage table
1734 offset entries. These may have been already set
1735 up by a check_relocs routine. */
1736 if (ht->got.offset == (bfd_vma) -1)
1738 ht->got.offset = hi->got.offset;
1739 hi->got.offset = (bfd_vma) -1;
1741 BFD_ASSERT (hi->got.offset == (bfd_vma) -1);
1743 if (ht->plt.offset == (bfd_vma) -1)
1745 ht->plt.offset = hi->plt.offset;
1746 hi->plt.offset = (bfd_vma) -1;
1748 BFD_ASSERT (hi->plt.offset == (bfd_vma) -1);
1750 if (ht->dynindx == -1)
1752 ht->dynindx = hi->dynindx;
1753 ht->dynstr_index = hi->dynstr_index;
1755 hi->dynstr_index = 0;
1757 BFD_ASSERT (hi->dynindx == -1);
1759 /* FIXME: There may be other information to copy
1760 over for particular targets. */
1762 /* See if the new flags lead us to realize that
1763 the symbol must be dynamic. */
1769 || ((hi->elf_link_hash_flags
1770 & ELF_LINK_HASH_REF_DYNAMIC)
1776 if ((hi->elf_link_hash_flags
1777 & ELF_LINK_HASH_REF_REGULAR) != 0)
1783 /* We also need to define an indirection from the
1784 nondefault version of the symbol. */
1786 shortname = bfd_hash_allocate (&info->hash->table,
1788 if (shortname == NULL)
1790 strncpy (shortname, name, p - name);
1791 strcpy (shortname + (p - name), p + 1);
1793 /* Once again, merge with any existing symbol. */
1794 type_change_ok = false;
1795 size_change_ok = false;
1796 if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
1797 &value, &hi, &override,
1798 &type_change_ok, &size_change_ok))
1803 /* Here SHORTNAME is a versioned name, so we
1804 don't expect to see the type of override we
1805 do in the case above. */
1806 (*_bfd_error_handler)
1807 (_("%s: warning: unexpected redefinition of `%s'"),
1808 bfd_get_filename (abfd), shortname);
1812 if (! (_bfd_generic_link_add_one_symbol
1813 (info, abfd, shortname, BSF_INDIRECT,
1814 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1815 collect, (struct bfd_link_hash_entry **) &hi)))
1818 /* If there is a duplicate definition somewhere,
1819 then HI may not point to an indirect symbol.
1820 We will have reported an error to the user in
1823 if (hi->root.type == bfd_link_hash_indirect)
1825 /* If the symbol became indirect, then we
1826 assume that we have not seen a definition
1828 BFD_ASSERT ((hi->elf_link_hash_flags
1829 & (ELF_LINK_HASH_DEF_DYNAMIC
1830 | ELF_LINK_HASH_DEF_REGULAR))
1833 /* Copy down any references that we may have
1834 already seen to the symbol which just
1836 h->elf_link_hash_flags |=
1837 (hi->elf_link_hash_flags
1838 & (ELF_LINK_HASH_REF_DYNAMIC
1839 | ELF_LINK_HASH_REF_REGULAR
1840 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
1841 | ELF_LINK_NON_GOT_REF));
1843 /* Copy over the global and procedure linkage
1844 table offset entries. These may have been
1845 already set up by a check_relocs routine. */
1846 if (h->got.offset == (bfd_vma) -1)
1848 h->got.offset = hi->got.offset;
1849 hi->got.offset = (bfd_vma) -1;
1851 BFD_ASSERT (hi->got.offset == (bfd_vma) -1);
1853 if (h->plt.offset == (bfd_vma) -1)
1855 h->plt.offset = hi->plt.offset;
1856 hi->plt.offset = (bfd_vma) -1;
1858 BFD_ASSERT (hi->got.offset == (bfd_vma) -1);
1860 if (h->dynindx == -1)
1862 h->dynindx = hi->dynindx;
1863 h->dynstr_index = hi->dynstr_index;
1865 hi->dynstr_index = 0;
1867 BFD_ASSERT (hi->dynindx == -1);
1869 /* FIXME: There may be other information to
1870 copy over for particular targets. */
1872 /* See if the new flags lead us to realize
1873 that the symbol must be dynamic. */
1879 || ((hi->elf_link_hash_flags
1880 & ELF_LINK_HASH_REF_DYNAMIC)
1886 if ((hi->elf_link_hash_flags
1887 & ELF_LINK_HASH_REF_REGULAR) != 0)
1896 if (dynsym && h->dynindx == -1)
1898 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
1900 if (h->weakdef != NULL
1902 && h->weakdef->dynindx == -1)
1904 if (! _bfd_elf_link_record_dynamic_symbol (info,
1912 /* Now set the weakdefs field correctly for all the weak defined
1913 symbols we found. The only way to do this is to search all the
1914 symbols. Since we only need the information for non functions in
1915 dynamic objects, that's the only time we actually put anything on
1916 the list WEAKS. We need this information so that if a regular
1917 object refers to a symbol defined weakly in a dynamic object, the
1918 real symbol in the dynamic object is also put in the dynamic
1919 symbols; we also must arrange for both symbols to point to the
1920 same memory location. We could handle the general case of symbol
1921 aliasing, but a general symbol alias can only be generated in
1922 assembler code, handling it correctly would be very time
1923 consuming, and other ELF linkers don't handle general aliasing
1925 while (weaks != NULL)
1927 struct elf_link_hash_entry *hlook;
1930 struct elf_link_hash_entry **hpp;
1931 struct elf_link_hash_entry **hppend;
1934 weaks = hlook->weakdef;
1935 hlook->weakdef = NULL;
1937 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
1938 || hlook->root.type == bfd_link_hash_defweak
1939 || hlook->root.type == bfd_link_hash_common
1940 || hlook->root.type == bfd_link_hash_indirect);
1941 slook = hlook->root.u.def.section;
1942 vlook = hlook->root.u.def.value;
1944 hpp = elf_sym_hashes (abfd);
1945 hppend = hpp + extsymcount;
1946 for (; hpp < hppend; hpp++)
1948 struct elf_link_hash_entry *h;
1951 if (h != NULL && h != hlook
1952 && h->root.type == bfd_link_hash_defined
1953 && h->root.u.def.section == slook
1954 && h->root.u.def.value == vlook)
1958 /* If the weak definition is in the list of dynamic
1959 symbols, make sure the real definition is put there
1961 if (hlook->dynindx != -1
1962 && h->dynindx == -1)
1964 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
1968 /* If the real definition is in the list of dynamic
1969 symbols, make sure the weak definition is put there
1970 as well. If we don't do this, then the dynamic
1971 loader might not merge the entries for the real
1972 definition and the weak definition. */
1973 if (h->dynindx != -1
1974 && hlook->dynindx == -1)
1976 if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
1991 if (extversym != NULL)
1997 /* If this object is the same format as the output object, and it is
1998 not a shared library, then let the backend look through the
2001 This is required to build global offset table entries and to
2002 arrange for dynamic relocs. It is not required for the
2003 particular common case of linking non PIC code, even when linking
2004 against shared libraries, but unfortunately there is no way of
2005 knowing whether an object file has been compiled PIC or not.
2006 Looking through the relocs is not particularly time consuming.
2007 The problem is that we must either (1) keep the relocs in memory,
2008 which causes the linker to require additional runtime memory or
2009 (2) read the relocs twice from the input file, which wastes time.
2010 This would be a good case for using mmap.
2012 I have no idea how to handle linking PIC code into a file of a
2013 different format. It probably can't be done. */
2014 check_relocs = get_elf_backend_data (abfd)->check_relocs;
2016 && abfd->xvec == info->hash->creator
2017 && check_relocs != NULL)
2021 for (o = abfd->sections; o != NULL; o = o->next)
2023 Elf_Internal_Rela *internal_relocs;
2026 if ((o->flags & SEC_RELOC) == 0
2027 || o->reloc_count == 0
2028 || ((info->strip == strip_all || info->strip == strip_debugger)
2029 && (o->flags & SEC_DEBUGGING) != 0)
2030 || bfd_is_abs_section (o->output_section))
2033 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2034 (abfd, o, (PTR) NULL,
2035 (Elf_Internal_Rela *) NULL,
2036 info->keep_memory));
2037 if (internal_relocs == NULL)
2040 ok = (*check_relocs) (abfd, info, o, internal_relocs);
2042 if (! info->keep_memory)
2043 free (internal_relocs);
2050 /* If this is a non-traditional, non-relocateable link, try to
2051 optimize the handling of the .stab/.stabstr sections. */
2053 && ! info->relocateable
2054 && ! info->traditional_format
2055 && info->hash->creator->flavour == bfd_target_elf_flavour
2056 && (info->strip != strip_all && info->strip != strip_debugger))
2058 asection *stab, *stabstr;
2060 stab = bfd_get_section_by_name (abfd, ".stab");
2063 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
2065 if (stabstr != NULL)
2067 struct bfd_elf_section_data *secdata;
2069 secdata = elf_section_data (stab);
2070 if (! _bfd_link_section_stabs (abfd,
2071 &elf_hash_table (info)->stab_info,
2073 &secdata->stab_info))
2088 if (extversym != NULL)
2093 /* Create some sections which will be filled in with dynamic linking
2094 information. ABFD is an input file which requires dynamic sections
2095 to be created. The dynamic sections take up virtual memory space
2096 when the final executable is run, so we need to create them before
2097 addresses are assigned to the output sections. We work out the
2098 actual contents and size of these sections later. */
2101 elf_link_create_dynamic_sections (abfd, info)
2103 struct bfd_link_info *info;
2106 register asection *s;
2107 struct elf_link_hash_entry *h;
2108 struct elf_backend_data *bed;
2110 if (elf_hash_table (info)->dynamic_sections_created)
2113 /* Make sure that all dynamic sections use the same input BFD. */
2114 if (elf_hash_table (info)->dynobj == NULL)
2115 elf_hash_table (info)->dynobj = abfd;
2117 abfd = elf_hash_table (info)->dynobj;
2119 /* Note that we set the SEC_IN_MEMORY flag for all of these
2121 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
2122 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2124 /* A dynamically linked executable has a .interp section, but a
2125 shared library does not. */
2128 s = bfd_make_section (abfd, ".interp");
2130 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2134 /* Create sections to hold version informations. These are removed
2135 if they are not needed. */
2136 s = bfd_make_section (abfd, ".gnu.version_d");
2138 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2139 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2142 s = bfd_make_section (abfd, ".gnu.version");
2144 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2145 || ! bfd_set_section_alignment (abfd, s, 1))
2148 s = bfd_make_section (abfd, ".gnu.version_r");
2150 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2151 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2154 s = bfd_make_section (abfd, ".dynsym");
2156 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2157 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2160 s = bfd_make_section (abfd, ".dynstr");
2162 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2165 /* Create a strtab to hold the dynamic symbol names. */
2166 if (elf_hash_table (info)->dynstr == NULL)
2168 elf_hash_table (info)->dynstr = elf_stringtab_init ();
2169 if (elf_hash_table (info)->dynstr == NULL)
2173 s = bfd_make_section (abfd, ".dynamic");
2175 || ! bfd_set_section_flags (abfd, s, flags)
2176 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2179 /* The special symbol _DYNAMIC is always set to the start of the
2180 .dynamic section. This call occurs before we have processed the
2181 symbols for any dynamic object, so we don't have to worry about
2182 overriding a dynamic definition. We could set _DYNAMIC in a
2183 linker script, but we only want to define it if we are, in fact,
2184 creating a .dynamic section. We don't want to define it if there
2185 is no .dynamic section, since on some ELF platforms the start up
2186 code examines it to decide how to initialize the process. */
2188 if (! (_bfd_generic_link_add_one_symbol
2189 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
2190 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
2191 (struct bfd_link_hash_entry **) &h)))
2193 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2194 h->type = STT_OBJECT;
2197 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
2200 bed = get_elf_backend_data (abfd);
2202 s = bfd_make_section (abfd, ".hash");
2204 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2205 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2207 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
2209 /* Let the backend create the rest of the sections. This lets the
2210 backend set the right flags. The backend will normally create
2211 the .got and .plt sections. */
2212 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
2215 elf_hash_table (info)->dynamic_sections_created = true;
2220 /* Add an entry to the .dynamic table. */
2223 elf_add_dynamic_entry (info, tag, val)
2224 struct bfd_link_info *info;
2228 Elf_Internal_Dyn dyn;
2232 bfd_byte *newcontents;
2234 dynobj = elf_hash_table (info)->dynobj;
2236 s = bfd_get_section_by_name (dynobj, ".dynamic");
2237 BFD_ASSERT (s != NULL);
2239 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
2240 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
2241 if (newcontents == NULL)
2245 dyn.d_un.d_val = val;
2246 elf_swap_dyn_out (dynobj, &dyn,
2247 (Elf_External_Dyn *) (newcontents + s->_raw_size));
2249 s->_raw_size = newsize;
2250 s->contents = newcontents;
2255 /* Record a new local dynamic symbol. */
2258 elf_link_record_local_dynamic_symbol (info, input_bfd, input_indx)
2259 struct bfd_link_info *info;
2263 struct elf_link_local_dynamic_entry *entry;
2264 struct elf_link_hash_table *eht;
2265 struct bfd_strtab_hash *dynstr;
2266 Elf_External_Sym esym;
2267 unsigned long dynstr_index;
2270 /* See if the entry exists already. */
2271 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
2272 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
2275 entry = (struct elf_link_local_dynamic_entry *)
2276 bfd_alloc (input_bfd, sizeof (*entry));
2280 /* Go find the symbol, so that we can find it's name. */
2281 if (bfd_seek (input_bfd,
2282 (elf_tdata (input_bfd)->symtab_hdr.sh_offset
2283 + input_indx * sizeof (Elf_External_Sym)),
2285 || (bfd_read (&esym, sizeof (Elf_External_Sym), 1, input_bfd)
2286 != sizeof (Elf_External_Sym)))
2288 elf_swap_symbol_in (input_bfd, &esym, &entry->isym);
2290 name = (bfd_elf_string_from_elf_section
2291 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
2292 entry->isym.st_name));
2294 dynstr = elf_hash_table (info)->dynstr;
2297 /* Create a strtab to hold the dynamic symbol names. */
2298 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_stringtab_init ();
2303 dynstr_index = _bfd_stringtab_add (dynstr, name, true, false);
2304 if (dynstr_index == (unsigned long) -1)
2306 entry->isym.st_name = dynstr_index;
2308 eht = elf_hash_table (info);
2310 entry->next = eht->dynlocal;
2311 eht->dynlocal = entry;
2312 entry->input_bfd = input_bfd;
2313 entry->input_indx = input_indx;
2316 /* Whatever binding the symbol had before, it's now local. */
2318 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
2320 /* The dynindx will be set at the end of size_dynamic_sections. */
2326 /* Read and swap the relocs from the section indicated by SHDR. This
2327 may be either a REL or a RELA section. The relocations are
2328 translated into RELA relocations and stored in INTERNAL_RELOCS,
2329 which should have already been allocated to contain enough space.
2330 The EXTERNAL_RELOCS are a buffer where the external form of the
2331 relocations should be stored.
2333 Returns false if something goes wrong. */
2336 elf_link_read_relocs_from_section (abfd, shdr, external_relocs,
2339 Elf_Internal_Shdr *shdr;
2340 PTR external_relocs;
2341 Elf_Internal_Rela *internal_relocs;
2343 struct elf_backend_data *bed;
2345 /* If there aren't any relocations, that's OK. */
2349 /* Position ourselves at the start of the section. */
2350 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2353 /* Read the relocations. */
2354 if (bfd_read (external_relocs, 1, shdr->sh_size, abfd)
2358 bed = get_elf_backend_data (abfd);
2360 /* Convert the external relocations to the internal format. */
2361 if (shdr->sh_entsize == sizeof (Elf_External_Rel))
2363 Elf_External_Rel *erel;
2364 Elf_External_Rel *erelend;
2365 Elf_Internal_Rela *irela;
2366 Elf_Internal_Rel *irel;
2368 erel = (Elf_External_Rel *) external_relocs;
2369 erelend = erel + shdr->sh_size / shdr->sh_entsize;
2370 irela = internal_relocs;
2371 irel = bfd_alloc (abfd, (bed->s->int_rels_per_ext_rel
2372 * sizeof (Elf_Internal_Rel)));
2373 for (; erel < erelend; erel++, irela += bed->s->int_rels_per_ext_rel)
2377 if (bed->s->swap_reloc_in)
2378 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
2380 elf_swap_reloc_in (abfd, erel, irel);
2382 for (i = 0; i < bed->s->int_rels_per_ext_rel; ++i)
2384 irela[i].r_offset = irel[i].r_offset;
2385 irela[i].r_info = irel[i].r_info;
2386 irela[i].r_addend = 0;
2392 Elf_External_Rela *erela;
2393 Elf_External_Rela *erelaend;
2394 Elf_Internal_Rela *irela;
2396 BFD_ASSERT (shdr->sh_entsize == sizeof (Elf_External_Rela));
2398 erela = (Elf_External_Rela *) external_relocs;
2399 erelaend = erela + shdr->sh_size / shdr->sh_entsize;
2400 irela = internal_relocs;
2401 for (; erela < erelaend; erela++, irela += bed->s->int_rels_per_ext_rel)
2403 if (bed->s->swap_reloca_in)
2404 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
2406 elf_swap_reloca_in (abfd, erela, irela);
2413 /* Read and swap the relocs for a section O. They may have been
2414 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2415 not NULL, they are used as buffers to read into. They are known to
2416 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2417 the return value is allocated using either malloc or bfd_alloc,
2418 according to the KEEP_MEMORY argument. If O has two relocation
2419 sections (both REL and RELA relocations), then the REL_HDR
2420 relocations will appear first in INTERNAL_RELOCS, followed by the
2421 REL_HDR2 relocations. */
2424 NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
2428 PTR external_relocs;
2429 Elf_Internal_Rela *internal_relocs;
2430 boolean keep_memory;
2432 Elf_Internal_Shdr *rel_hdr;
2434 Elf_Internal_Rela *alloc2 = NULL;
2435 struct elf_backend_data *bed = get_elf_backend_data (abfd);
2437 if (elf_section_data (o)->relocs != NULL)
2438 return elf_section_data (o)->relocs;
2440 if (o->reloc_count == 0)
2443 rel_hdr = &elf_section_data (o)->rel_hdr;
2445 if (internal_relocs == NULL)
2449 size = (o->reloc_count * bed->s->int_rels_per_ext_rel
2450 * sizeof (Elf_Internal_Rela));
2452 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2454 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2455 if (internal_relocs == NULL)
2459 if (external_relocs == NULL)
2461 size_t size = (size_t) rel_hdr->sh_size;
2463 if (elf_section_data (o)->rel_hdr2)
2464 size += (size_t) elf_section_data (o)->rel_hdr2->sh_size;
2465 alloc1 = (PTR) bfd_malloc (size);
2468 external_relocs = alloc1;
2471 if (!elf_link_read_relocs_from_section (abfd, rel_hdr,
2475 if (!elf_link_read_relocs_from_section
2477 elf_section_data (o)->rel_hdr2,
2478 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2479 internal_relocs + (rel_hdr->sh_size / rel_hdr->sh_entsize
2480 * bed->s->int_rels_per_ext_rel)))
2483 /* Cache the results for next time, if we can. */
2485 elf_section_data (o)->relocs = internal_relocs;
2490 /* Don't free alloc2, since if it was allocated we are passing it
2491 back (under the name of internal_relocs). */
2493 return internal_relocs;
2504 /* Record an assignment to a symbol made by a linker script. We need
2505 this in case some dynamic object refers to this symbol. */
2509 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
2510 bfd *output_bfd ATTRIBUTE_UNUSED;
2511 struct bfd_link_info *info;
2515 struct elf_link_hash_entry *h;
2517 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2520 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
2524 if (h->root.type == bfd_link_hash_new)
2525 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
2527 /* If this symbol is being provided by the linker script, and it is
2528 currently defined by a dynamic object, but not by a regular
2529 object, then mark it as undefined so that the generic linker will
2530 force the correct value. */
2532 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2533 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2534 h->root.type = bfd_link_hash_undefined;
2536 /* If this symbol is not being provided by the linker script, and it is
2537 currently defined by a dynamic object, but not by a regular object,
2538 then clear out any version information because the symbol will not be
2539 associated with the dynamic object any more. */
2541 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2542 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2543 h->verinfo.verdef = NULL;
2545 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2547 /* When possible, keep the original type of the symbol */
2548 if (h->type == STT_NOTYPE)
2549 h->type = STT_OBJECT;
2551 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2552 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
2554 && h->dynindx == -1)
2556 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2559 /* If this is a weak defined symbol, and we know a corresponding
2560 real symbol from the same dynamic object, make sure the real
2561 symbol is also made into a dynamic symbol. */
2562 if (h->weakdef != NULL
2563 && h->weakdef->dynindx == -1)
2565 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2573 /* This structure is used to pass information to
2574 elf_link_assign_sym_version. */
2576 struct elf_assign_sym_version_info
2580 /* General link information. */
2581 struct bfd_link_info *info;
2583 struct bfd_elf_version_tree *verdefs;
2584 /* Whether we are exporting all dynamic symbols. */
2585 boolean export_dynamic;
2586 /* Whether we had a failure. */
2590 /* This structure is used to pass information to
2591 elf_link_find_version_dependencies. */
2593 struct elf_find_verdep_info
2597 /* General link information. */
2598 struct bfd_link_info *info;
2599 /* The number of dependencies. */
2601 /* Whether we had a failure. */
2605 /* Array used to determine the number of hash table buckets to use
2606 based on the number of symbols there are. If there are fewer than
2607 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2608 fewer than 37 we use 17 buckets, and so forth. We never use more
2609 than 32771 buckets. */
2611 static const size_t elf_buckets[] =
2613 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2617 /* Compute bucket count for hashing table. We do not use a static set
2618 of possible tables sizes anymore. Instead we determine for all
2619 possible reasonable sizes of the table the outcome (i.e., the
2620 number of collisions etc) and choose the best solution. The
2621 weighting functions are not too simple to allow the table to grow
2622 without bounds. Instead one of the weighting factors is the size.
2623 Therefore the result is always a good payoff between few collisions
2624 (= short chain lengths) and table size. */
2626 compute_bucket_count (info)
2627 struct bfd_link_info *info;
2629 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
2630 size_t best_size = 0;
2631 unsigned long int *hashcodes;
2632 unsigned long int *hashcodesp;
2633 unsigned long int i;
2635 /* Compute the hash values for all exported symbols. At the same
2636 time store the values in an array so that we could use them for
2638 hashcodes = (unsigned long int *) bfd_malloc (dynsymcount
2639 * sizeof (unsigned long int));
2640 if (hashcodes == NULL)
2642 hashcodesp = hashcodes;
2644 /* Put all hash values in HASHCODES. */
2645 elf_link_hash_traverse (elf_hash_table (info),
2646 elf_collect_hash_codes, &hashcodesp);
2648 /* We have a problem here. The following code to optimize the table
2649 size requires an integer type with more the 32 bits. If
2650 BFD_HOST_U_64_BIT is set we know about such a type. */
2651 #ifdef BFD_HOST_U_64_BIT
2652 if (info->optimize == true)
2654 unsigned long int nsyms = hashcodesp - hashcodes;
2657 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
2658 unsigned long int *counts ;
2660 /* Possible optimization parameters: if we have NSYMS symbols we say
2661 that the hashing table must at least have NSYMS/4 and at most
2663 minsize = nsyms / 4;
2666 best_size = maxsize = nsyms * 2;
2668 /* Create array where we count the collisions in. We must use bfd_malloc
2669 since the size could be large. */
2670 counts = (unsigned long int *) bfd_malloc (maxsize
2671 * sizeof (unsigned long int));
2678 /* Compute the "optimal" size for the hash table. The criteria is a
2679 minimal chain length. The minor criteria is (of course) the size
2681 for (i = minsize; i < maxsize; ++i)
2683 /* Walk through the array of hashcodes and count the collisions. */
2684 BFD_HOST_U_64_BIT max;
2685 unsigned long int j;
2686 unsigned long int fact;
2688 memset (counts, '\0', i * sizeof (unsigned long int));
2690 /* Determine how often each hash bucket is used. */
2691 for (j = 0; j < nsyms; ++j)
2692 ++counts[hashcodes[j] % i];
2694 /* For the weight function we need some information about the
2695 pagesize on the target. This is information need not be 100%
2696 accurate. Since this information is not available (so far) we
2697 define it here to a reasonable default value. If it is crucial
2698 to have a better value some day simply define this value. */
2699 # ifndef BFD_TARGET_PAGESIZE
2700 # define BFD_TARGET_PAGESIZE (4096)
2703 /* We in any case need 2 + NSYMS entries for the size values and
2705 max = (2 + nsyms) * (ARCH_SIZE / 8);
2708 /* Variant 1: optimize for short chains. We add the squares
2709 of all the chain lengths (which favous many small chain
2710 over a few long chains). */
2711 for (j = 0; j < i; ++j)
2712 max += counts[j] * counts[j];
2714 /* This adds penalties for the overall size of the table. */
2715 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2718 /* Variant 2: Optimize a lot more for small table. Here we
2719 also add squares of the size but we also add penalties for
2720 empty slots (the +1 term). */
2721 for (j = 0; j < i; ++j)
2722 max += (1 + counts[j]) * (1 + counts[j]);
2724 /* The overall size of the table is considered, but not as
2725 strong as in variant 1, where it is squared. */
2726 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2730 /* Compare with current best results. */
2731 if (max < best_chlen)
2741 #endif /* defined (BFD_HOST_U_64_BIT) */
2743 /* This is the fallback solution if no 64bit type is available or if we
2744 are not supposed to spend much time on optimizations. We select the
2745 bucket count using a fixed set of numbers. */
2746 for (i = 0; elf_buckets[i] != 0; i++)
2748 best_size = elf_buckets[i];
2749 if (dynsymcount < elf_buckets[i + 1])
2754 /* Free the arrays we needed. */
2760 /* Set up the sizes and contents of the ELF dynamic sections. This is
2761 called by the ELF linker emulation before_allocation routine. We
2762 must set the sizes of the sections before the linker sets the
2763 addresses of the various sections. */
2766 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
2767 export_dynamic, filter_shlib,
2768 auxiliary_filters, info, sinterpptr,
2773 boolean export_dynamic;
2774 const char *filter_shlib;
2775 const char * const *auxiliary_filters;
2776 struct bfd_link_info *info;
2777 asection **sinterpptr;
2778 struct bfd_elf_version_tree *verdefs;
2780 bfd_size_type soname_indx;
2782 struct elf_backend_data *bed;
2783 struct elf_assign_sym_version_info asvinfo;
2787 soname_indx = (bfd_size_type) -1;
2789 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2792 /* The backend may have to create some sections regardless of whether
2793 we're dynamic or not. */
2794 bed = get_elf_backend_data (output_bfd);
2795 if (bed->elf_backend_always_size_sections
2796 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
2799 dynobj = elf_hash_table (info)->dynobj;
2801 /* If there were no dynamic objects in the link, there is nothing to
2806 /* If we are supposed to export all symbols into the dynamic symbol
2807 table (this is not the normal case), then do so. */
2810 struct elf_info_failed eif;
2814 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
2820 if (elf_hash_table (info)->dynamic_sections_created)
2822 struct elf_info_failed eif;
2823 struct elf_link_hash_entry *h;
2824 bfd_size_type strsize;
2826 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
2827 BFD_ASSERT (*sinterpptr != NULL || info->shared);
2831 soname_indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2832 soname, true, true);
2833 if (soname_indx == (bfd_size_type) -1
2834 || ! elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
2840 if (! elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
2848 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, rpath,
2850 if (indx == (bfd_size_type) -1
2851 || ! elf_add_dynamic_entry (info, DT_RPATH, indx))
2855 if (filter_shlib != NULL)
2859 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2860 filter_shlib, true, true);
2861 if (indx == (bfd_size_type) -1
2862 || ! elf_add_dynamic_entry (info, DT_FILTER, indx))
2866 if (auxiliary_filters != NULL)
2868 const char * const *p;
2870 for (p = auxiliary_filters; *p != NULL; p++)
2874 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2876 if (indx == (bfd_size_type) -1
2877 || ! elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
2882 /* Attach all the symbols to their version information. */
2883 asvinfo.output_bfd = output_bfd;
2884 asvinfo.info = info;
2885 asvinfo.verdefs = verdefs;
2886 asvinfo.export_dynamic = export_dynamic;
2887 asvinfo.failed = false;
2889 elf_link_hash_traverse (elf_hash_table (info),
2890 elf_link_assign_sym_version,
2895 /* Find all symbols which were defined in a dynamic object and make
2896 the backend pick a reasonable value for them. */
2899 elf_link_hash_traverse (elf_hash_table (info),
2900 elf_adjust_dynamic_symbol,
2905 /* Add some entries to the .dynamic section. We fill in some of the
2906 values later, in elf_bfd_final_link, but we must add the entries
2907 now so that we know the final size of the .dynamic section. */
2909 /* If there are initialization and/or finalization functions to
2910 call then add the corresponding DT_INIT/DT_FINI entries. */
2911 h = (info->init_function
2912 ? elf_link_hash_lookup (elf_hash_table (info),
2913 info->init_function, false,
2917 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
2918 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
2920 if (! elf_add_dynamic_entry (info, DT_INIT, 0))
2923 h = (info->fini_function
2924 ? elf_link_hash_lookup (elf_hash_table (info),
2925 info->fini_function, false,
2929 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
2930 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
2932 if (! elf_add_dynamic_entry (info, DT_FINI, 0))
2936 strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
2937 if (! elf_add_dynamic_entry (info, DT_HASH, 0)
2938 || ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
2939 || ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
2940 || ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
2941 || ! elf_add_dynamic_entry (info, DT_SYMENT,
2942 sizeof (Elf_External_Sym)))
2946 /* The backend must work out the sizes of all the other dynamic
2948 if (bed->elf_backend_size_dynamic_sections
2949 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
2952 if (elf_hash_table (info)->dynamic_sections_created)
2956 size_t bucketcount = 0;
2957 Elf_Internal_Sym isym;
2958 size_t hash_entry_size;
2960 /* Set up the version definition section. */
2961 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
2962 BFD_ASSERT (s != NULL);
2964 /* We may have created additional version definitions if we are
2965 just linking a regular application. */
2966 verdefs = asvinfo.verdefs;
2968 if (verdefs == NULL)
2969 _bfd_strip_section_from_output (s);
2974 struct bfd_elf_version_tree *t;
2976 Elf_Internal_Verdef def;
2977 Elf_Internal_Verdaux defaux;
2982 /* Make space for the base version. */
2983 size += sizeof (Elf_External_Verdef);
2984 size += sizeof (Elf_External_Verdaux);
2987 for (t = verdefs; t != NULL; t = t->next)
2989 struct bfd_elf_version_deps *n;
2991 size += sizeof (Elf_External_Verdef);
2992 size += sizeof (Elf_External_Verdaux);
2995 for (n = t->deps; n != NULL; n = n->next)
2996 size += sizeof (Elf_External_Verdaux);
2999 s->_raw_size = size;
3000 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3001 if (s->contents == NULL && s->_raw_size != 0)
3004 /* Fill in the version definition section. */
3008 def.vd_version = VER_DEF_CURRENT;
3009 def.vd_flags = VER_FLG_BASE;
3012 def.vd_aux = sizeof (Elf_External_Verdef);
3013 def.vd_next = (sizeof (Elf_External_Verdef)
3014 + sizeof (Elf_External_Verdaux));
3016 if (soname_indx != (bfd_size_type) -1)
3018 def.vd_hash = bfd_elf_hash (soname);
3019 defaux.vda_name = soname_indx;
3026 name = output_bfd->filename;
3027 def.vd_hash = bfd_elf_hash (name);
3028 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3030 if (indx == (bfd_size_type) -1)
3032 defaux.vda_name = indx;
3034 defaux.vda_next = 0;
3036 _bfd_elf_swap_verdef_out (output_bfd, &def,
3037 (Elf_External_Verdef *)p);
3038 p += sizeof (Elf_External_Verdef);
3039 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3040 (Elf_External_Verdaux *) p);
3041 p += sizeof (Elf_External_Verdaux);
3043 for (t = verdefs; t != NULL; t = t->next)
3046 struct bfd_elf_version_deps *n;
3047 struct elf_link_hash_entry *h;
3050 for (n = t->deps; n != NULL; n = n->next)
3053 /* Add a symbol representing this version. */
3055 if (! (_bfd_generic_link_add_one_symbol
3056 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
3057 (bfd_vma) 0, (const char *) NULL, false,
3058 get_elf_backend_data (dynobj)->collect,
3059 (struct bfd_link_hash_entry **) &h)))
3061 h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
3062 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3063 h->type = STT_OBJECT;
3064 h->verinfo.vertree = t;
3066 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
3069 def.vd_version = VER_DEF_CURRENT;
3071 if (t->globals == NULL && t->locals == NULL && ! t->used)
3072 def.vd_flags |= VER_FLG_WEAK;
3073 def.vd_ndx = t->vernum + 1;
3074 def.vd_cnt = cdeps + 1;
3075 def.vd_hash = bfd_elf_hash (t->name);
3076 def.vd_aux = sizeof (Elf_External_Verdef);
3077 if (t->next != NULL)
3078 def.vd_next = (sizeof (Elf_External_Verdef)
3079 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
3083 _bfd_elf_swap_verdef_out (output_bfd, &def,
3084 (Elf_External_Verdef *) p);
3085 p += sizeof (Elf_External_Verdef);
3087 defaux.vda_name = h->dynstr_index;
3088 if (t->deps == NULL)
3089 defaux.vda_next = 0;
3091 defaux.vda_next = sizeof (Elf_External_Verdaux);
3092 t->name_indx = defaux.vda_name;
3094 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3095 (Elf_External_Verdaux *) p);
3096 p += sizeof (Elf_External_Verdaux);
3098 for (n = t->deps; n != NULL; n = n->next)
3100 if (n->version_needed == NULL)
3102 /* This can happen if there was an error in the
3104 defaux.vda_name = 0;
3107 defaux.vda_name = n->version_needed->name_indx;
3108 if (n->next == NULL)
3109 defaux.vda_next = 0;
3111 defaux.vda_next = sizeof (Elf_External_Verdaux);
3113 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3114 (Elf_External_Verdaux *) p);
3115 p += sizeof (Elf_External_Verdaux);
3119 if (! elf_add_dynamic_entry (info, DT_VERDEF, 0)
3120 || ! elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
3123 elf_tdata (output_bfd)->cverdefs = cdefs;
3126 /* Work out the size of the version reference section. */
3128 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3129 BFD_ASSERT (s != NULL);
3131 struct elf_find_verdep_info sinfo;
3133 sinfo.output_bfd = output_bfd;
3135 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
3136 if (sinfo.vers == 0)
3138 sinfo.failed = false;
3140 elf_link_hash_traverse (elf_hash_table (info),
3141 elf_link_find_version_dependencies,
3144 if (elf_tdata (output_bfd)->verref == NULL)
3145 _bfd_strip_section_from_output (s);
3148 Elf_Internal_Verneed *t;
3153 /* Build the version definition section. */
3156 for (t = elf_tdata (output_bfd)->verref;
3160 Elf_Internal_Vernaux *a;
3162 size += sizeof (Elf_External_Verneed);
3164 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3165 size += sizeof (Elf_External_Vernaux);
3168 s->_raw_size = size;
3169 s->contents = (bfd_byte *) bfd_alloc (output_bfd, size);
3170 if (s->contents == NULL)
3174 for (t = elf_tdata (output_bfd)->verref;
3179 Elf_Internal_Vernaux *a;
3183 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3186 t->vn_version = VER_NEED_CURRENT;
3188 if (elf_dt_name (t->vn_bfd) != NULL)
3189 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3190 elf_dt_name (t->vn_bfd),
3193 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3194 t->vn_bfd->filename, true, false);
3195 if (indx == (bfd_size_type) -1)
3198 t->vn_aux = sizeof (Elf_External_Verneed);
3199 if (t->vn_nextref == NULL)
3202 t->vn_next = (sizeof (Elf_External_Verneed)
3203 + caux * sizeof (Elf_External_Vernaux));
3205 _bfd_elf_swap_verneed_out (output_bfd, t,
3206 (Elf_External_Verneed *) p);
3207 p += sizeof (Elf_External_Verneed);
3209 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3211 a->vna_hash = bfd_elf_hash (a->vna_nodename);
3212 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3213 a->vna_nodename, true, false);
3214 if (indx == (bfd_size_type) -1)
3217 if (a->vna_nextptr == NULL)
3220 a->vna_next = sizeof (Elf_External_Vernaux);
3222 _bfd_elf_swap_vernaux_out (output_bfd, a,
3223 (Elf_External_Vernaux *) p);
3224 p += sizeof (Elf_External_Vernaux);
3228 if (! elf_add_dynamic_entry (info, DT_VERNEED, 0)
3229 || ! elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
3232 elf_tdata (output_bfd)->cverrefs = crefs;
3236 /* Assign dynsym indicies. In a shared library we generate a
3237 section symbol for each output section, which come first.
3238 Next come all of the back-end allocated local dynamic syms,
3239 followed by the rest of the global symbols. */
3241 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3243 /* Work out the size of the symbol version section. */
3244 s = bfd_get_section_by_name (dynobj, ".gnu.version");
3245 BFD_ASSERT (s != NULL);
3246 if (dynsymcount == 0
3247 || (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
3249 _bfd_strip_section_from_output (s);
3250 /* The DYNSYMCOUNT might have changed if we were going to
3251 output a dynamic symbol table entry for S. */
3252 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3256 s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
3257 s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3258 if (s->contents == NULL)
3261 if (! elf_add_dynamic_entry (info, DT_VERSYM, 0))
3265 /* Set the size of the .dynsym and .hash sections. We counted
3266 the number of dynamic symbols in elf_link_add_object_symbols.
3267 We will build the contents of .dynsym and .hash when we build
3268 the final symbol table, because until then we do not know the
3269 correct value to give the symbols. We built the .dynstr
3270 section as we went along in elf_link_add_object_symbols. */
3271 s = bfd_get_section_by_name (dynobj, ".dynsym");
3272 BFD_ASSERT (s != NULL);
3273 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
3274 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3275 if (s->contents == NULL && s->_raw_size != 0)
3278 /* The first entry in .dynsym is a dummy symbol. */
3285 elf_swap_symbol_out (output_bfd, &isym,
3286 (PTR) (Elf_External_Sym *) s->contents);
3288 /* Compute the size of the hashing table. As a side effect this
3289 computes the hash values for all the names we export. */
3290 bucketcount = compute_bucket_count (info);
3292 s = bfd_get_section_by_name (dynobj, ".hash");
3293 BFD_ASSERT (s != NULL);
3294 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
3295 s->_raw_size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
3296 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3297 if (s->contents == NULL)
3299 memset (s->contents, 0, (size_t) s->_raw_size);
3301 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
3302 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
3303 s->contents + hash_entry_size);
3305 elf_hash_table (info)->bucketcount = bucketcount;
3307 s = bfd_get_section_by_name (dynobj, ".dynstr");
3308 BFD_ASSERT (s != NULL);
3309 s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
3311 if (! elf_add_dynamic_entry (info, DT_NULL, 0))
3318 /* Fix up the flags for a symbol. This handles various cases which
3319 can only be fixed after all the input files are seen. This is
3320 currently called by both adjust_dynamic_symbol and
3321 assign_sym_version, which is unnecessary but perhaps more robust in
3322 the face of future changes. */
3325 elf_fix_symbol_flags (h, eif)
3326 struct elf_link_hash_entry *h;
3327 struct elf_info_failed *eif;
3329 /* If this symbol was mentioned in a non-ELF file, try to set
3330 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3331 permit a non-ELF file to correctly refer to a symbol defined in
3332 an ELF dynamic object. */
3333 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
3335 if (h->root.type != bfd_link_hash_defined
3336 && h->root.type != bfd_link_hash_defweak)
3337 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3338 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3341 if (h->root.u.def.section->owner != NULL
3342 && (bfd_get_flavour (h->root.u.def.section->owner)
3343 == bfd_target_elf_flavour))
3344 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3345 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3347 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3350 if (h->dynindx == -1
3351 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3352 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
3354 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3363 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3364 was first seen in a non-ELF file. Fortunately, if the symbol
3365 was first seen in an ELF file, we're probably OK unless the
3366 symbol was defined in a non-ELF file. Catch that case here.
3367 FIXME: We're still in trouble if the symbol was first seen in
3368 a dynamic object, and then later in a non-ELF regular object. */
3369 if ((h->root.type == bfd_link_hash_defined
3370 || h->root.type == bfd_link_hash_defweak)
3371 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3372 && (h->root.u.def.section->owner != NULL
3373 ? (bfd_get_flavour (h->root.u.def.section->owner)
3374 != bfd_target_elf_flavour)
3375 : (bfd_is_abs_section (h->root.u.def.section)
3376 && (h->elf_link_hash_flags
3377 & ELF_LINK_HASH_DEF_DYNAMIC) == 0)))
3378 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3381 /* If this is a final link, and the symbol was defined as a common
3382 symbol in a regular object file, and there was no definition in
3383 any dynamic object, then the linker will have allocated space for
3384 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3385 flag will not have been set. */
3386 if (h->root.type == bfd_link_hash_defined
3387 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3388 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
3389 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3390 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
3391 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3393 /* If -Bsymbolic was used (which means to bind references to global
3394 symbols to the definition within the shared object), and this
3395 symbol was defined in a regular object, then it actually doesn't
3396 need a PLT entry. */
3397 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
3398 && eif->info->shared
3399 && eif->info->symbolic
3400 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3402 h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT;
3403 h->plt.offset = (bfd_vma) -1;
3406 /* If this is a weak defined symbol in a dynamic object, and we know
3407 the real definition in the dynamic object, copy interesting flags
3408 over to the real definition. */
3409 if (h->weakdef != NULL)
3411 struct elf_link_hash_entry *weakdef;
3413 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3414 || h->root.type == bfd_link_hash_defweak);
3415 weakdef = h->weakdef;
3416 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
3417 || weakdef->root.type == bfd_link_hash_defweak);
3418 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
3420 /* If the real definition is defined by a regular object file,
3421 don't do anything special. See the longer description in
3422 elf_adjust_dynamic_symbol, below. */
3423 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3426 weakdef->elf_link_hash_flags |=
3427 (h->elf_link_hash_flags
3428 & (ELF_LINK_HASH_REF_REGULAR
3429 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3430 | ELF_LINK_NON_GOT_REF));
3436 /* Make the backend pick a good value for a dynamic symbol. This is
3437 called via elf_link_hash_traverse, and also calls itself
3441 elf_adjust_dynamic_symbol (h, data)
3442 struct elf_link_hash_entry *h;
3445 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3447 struct elf_backend_data *bed;
3449 /* Ignore indirect symbols. These are added by the versioning code. */
3450 if (h->root.type == bfd_link_hash_indirect)
3453 /* Fix the symbol flags. */
3454 if (! elf_fix_symbol_flags (h, eif))
3457 /* If this symbol does not require a PLT entry, and it is not
3458 defined by a dynamic object, or is not referenced by a regular
3459 object, ignore it. We do have to handle a weak defined symbol,
3460 even if no regular object refers to it, if we decided to add it
3461 to the dynamic symbol table. FIXME: Do we normally need to worry
3462 about symbols which are defined by one dynamic object and
3463 referenced by another one? */
3464 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
3465 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3466 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3467 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
3468 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
3470 h->plt.offset = (bfd_vma) -1;
3474 /* If we've already adjusted this symbol, don't do it again. This
3475 can happen via a recursive call. */
3476 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
3479 /* Don't look at this symbol again. Note that we must set this
3480 after checking the above conditions, because we may look at a
3481 symbol once, decide not to do anything, and then get called
3482 recursively later after REF_REGULAR is set below. */
3483 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
3485 /* If this is a weak definition, and we know a real definition, and
3486 the real symbol is not itself defined by a regular object file,
3487 then get a good value for the real definition. We handle the
3488 real symbol first, for the convenience of the backend routine.
3490 Note that there is a confusing case here. If the real definition
3491 is defined by a regular object file, we don't get the real symbol
3492 from the dynamic object, but we do get the weak symbol. If the
3493 processor backend uses a COPY reloc, then if some routine in the
3494 dynamic object changes the real symbol, we will not see that
3495 change in the corresponding weak symbol. This is the way other
3496 ELF linkers work as well, and seems to be a result of the shared
3499 I will clarify this issue. Most SVR4 shared libraries define the
3500 variable _timezone and define timezone as a weak synonym. The
3501 tzset call changes _timezone. If you write
3502 extern int timezone;
3504 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3505 you might expect that, since timezone is a synonym for _timezone,
3506 the same number will print both times. However, if the processor
3507 backend uses a COPY reloc, then actually timezone will be copied
3508 into your process image, and, since you define _timezone
3509 yourself, _timezone will not. Thus timezone and _timezone will
3510 wind up at different memory locations. The tzset call will set
3511 _timezone, leaving timezone unchanged. */
3513 if (h->weakdef != NULL)
3515 /* If we get to this point, we know there is an implicit
3516 reference by a regular object file via the weak symbol H.
3517 FIXME: Is this really true? What if the traversal finds
3518 H->WEAKDEF before it finds H? */
3519 h->weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
3521 if (! elf_adjust_dynamic_symbol (h->weakdef, (PTR) eif))
3525 /* If a symbol has no type and no size and does not require a PLT
3526 entry, then we are probably about to do the wrong thing here: we
3527 are probably going to create a COPY reloc for an empty object.
3528 This case can arise when a shared object is built with assembly
3529 code, and the assembly code fails to set the symbol type. */
3531 && h->type == STT_NOTYPE
3532 && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0)
3533 (*_bfd_error_handler)
3534 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3535 h->root.root.string);
3537 dynobj = elf_hash_table (eif->info)->dynobj;
3538 bed = get_elf_backend_data (dynobj);
3539 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
3548 /* This routine is used to export all defined symbols into the dynamic
3549 symbol table. It is called via elf_link_hash_traverse. */
3552 elf_export_symbol (h, data)
3553 struct elf_link_hash_entry *h;
3556 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3558 /* Ignore indirect symbols. These are added by the versioning code. */
3559 if (h->root.type == bfd_link_hash_indirect)
3562 if (h->dynindx == -1
3563 && (h->elf_link_hash_flags
3564 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
3566 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3576 /* Look through the symbols which are defined in other shared
3577 libraries and referenced here. Update the list of version
3578 dependencies. This will be put into the .gnu.version_r section.
3579 This function is called via elf_link_hash_traverse. */
3582 elf_link_find_version_dependencies (h, data)
3583 struct elf_link_hash_entry *h;
3586 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
3587 Elf_Internal_Verneed *t;
3588 Elf_Internal_Vernaux *a;
3590 /* We only care about symbols defined in shared objects with version
3592 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3593 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3595 || h->verinfo.verdef == NULL)
3598 /* See if we already know about this version. */
3599 for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
3601 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
3604 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3605 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
3611 /* This is a new version. Add it to tree we are building. */
3615 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, sizeof *t);
3618 rinfo->failed = true;
3622 t->vn_bfd = h->verinfo.verdef->vd_bfd;
3623 t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
3624 elf_tdata (rinfo->output_bfd)->verref = t;
3627 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, sizeof *a);
3629 /* Note that we are copying a string pointer here, and testing it
3630 above. If bfd_elf_string_from_elf_section is ever changed to
3631 discard the string data when low in memory, this will have to be
3633 a->vna_nodename = h->verinfo.verdef->vd_nodename;
3635 a->vna_flags = h->verinfo.verdef->vd_flags;
3636 a->vna_nextptr = t->vn_auxptr;
3638 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
3641 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
3648 /* Figure out appropriate versions for all the symbols. We may not
3649 have the version number script until we have read all of the input
3650 files, so until that point we don't know which symbols should be
3651 local. This function is called via elf_link_hash_traverse. */
3654 elf_link_assign_sym_version (h, data)
3655 struct elf_link_hash_entry *h;
3658 struct elf_assign_sym_version_info *sinfo =
3659 (struct elf_assign_sym_version_info *) data;
3660 struct bfd_link_info *info = sinfo->info;
3661 struct elf_info_failed eif;
3664 /* Fix the symbol flags. */
3667 if (! elf_fix_symbol_flags (h, &eif))
3670 sinfo->failed = true;
3674 /* We only need version numbers for symbols defined in regular
3676 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3679 p = strchr (h->root.root.string, ELF_VER_CHR);
3680 if (p != NULL && h->verinfo.vertree == NULL)
3682 struct bfd_elf_version_tree *t;
3687 /* There are two consecutive ELF_VER_CHR characters if this is
3688 not a hidden symbol. */
3690 if (*p == ELF_VER_CHR)
3696 /* If there is no version string, we can just return out. */
3700 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
3704 /* Look for the version. If we find it, it is no longer weak. */
3705 for (t = sinfo->verdefs; t != NULL; t = t->next)
3707 if (strcmp (t->name, p) == 0)
3711 struct bfd_elf_version_expr *d;
3713 len = p - h->root.root.string;
3714 alc = bfd_alloc (sinfo->output_bfd, len);
3717 strncpy (alc, h->root.root.string, len - 1);
3718 alc[len - 1] = '\0';
3719 if (alc[len - 2] == ELF_VER_CHR)
3720 alc[len - 2] = '\0';
3722 h->verinfo.vertree = t;
3726 if (t->globals != NULL)
3728 for (d = t->globals; d != NULL; d = d->next)
3729 if ((*d->match) (d, alc))
3733 /* See if there is anything to force this symbol to
3735 if (d == NULL && t->locals != NULL)
3737 for (d = t->locals; d != NULL; d = d->next)
3739 if ((*d->match) (d, alc))
3741 if (h->dynindx != -1
3743 && ! sinfo->export_dynamic)
3745 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
3746 h->elf_link_hash_flags &=~
3747 ELF_LINK_HASH_NEEDS_PLT;
3749 h->plt.offset = (bfd_vma) -1;
3750 /* FIXME: The name of the symbol has
3751 already been recorded in the dynamic
3752 string table section. */
3760 bfd_release (sinfo->output_bfd, alc);
3765 /* If we are building an application, we need to create a
3766 version node for this version. */
3767 if (t == NULL && ! info->shared)
3769 struct bfd_elf_version_tree **pp;
3772 /* If we aren't going to export this symbol, we don't need
3773 to worry about it. */
3774 if (h->dynindx == -1)
3777 t = ((struct bfd_elf_version_tree *)
3778 bfd_alloc (sinfo->output_bfd, sizeof *t));
3781 sinfo->failed = true;
3790 t->name_indx = (unsigned int) -1;
3794 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
3796 t->vernum = version_index;
3800 h->verinfo.vertree = t;
3804 /* We could not find the version for a symbol when
3805 generating a shared archive. Return an error. */
3806 (*_bfd_error_handler)
3807 (_("%s: undefined versioned symbol name %s"),
3808 bfd_get_filename (sinfo->output_bfd), h->root.root.string);
3809 bfd_set_error (bfd_error_bad_value);
3810 sinfo->failed = true;
3815 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
3818 /* If we don't have a version for this symbol, see if we can find
3820 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
3822 struct bfd_elf_version_tree *t;
3823 struct bfd_elf_version_tree *deflt;
3824 struct bfd_elf_version_expr *d;
3826 /* See if can find what version this symbol is in. If the
3827 symbol is supposed to be local, then don't actually register
3830 for (t = sinfo->verdefs; t != NULL; t = t->next)
3832 if (t->globals != NULL)
3834 for (d = t->globals; d != NULL; d = d->next)
3836 if ((*d->match) (d, h->root.root.string))
3838 h->verinfo.vertree = t;
3847 if (t->locals != NULL)
3849 for (d = t->locals; d != NULL; d = d->next)
3851 if (d->pattern[0] == '*' && d->pattern[1] == '\0')
3853 else if ((*d->match) (d, h->root.root.string))
3855 h->verinfo.vertree = t;
3856 if (h->dynindx != -1
3858 && ! sinfo->export_dynamic)
3860 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
3861 h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT;
3863 h->plt.offset = (bfd_vma) -1;
3864 /* FIXME: The name of the symbol has already
3865 been recorded in the dynamic string table
3877 if (deflt != NULL && h->verinfo.vertree == NULL)
3879 h->verinfo.vertree = deflt;
3880 if (h->dynindx != -1
3882 && ! sinfo->export_dynamic)
3884 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
3885 h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT;
3887 h->plt.offset = (bfd_vma) -1;
3888 /* FIXME: The name of the symbol has already been
3889 recorded in the dynamic string table section. */
3897 /* Final phase of ELF linker. */
3899 /* A structure we use to avoid passing large numbers of arguments. */
3901 struct elf_final_link_info
3903 /* General link information. */
3904 struct bfd_link_info *info;
3907 /* Symbol string table. */
3908 struct bfd_strtab_hash *symstrtab;
3909 /* .dynsym section. */
3910 asection *dynsym_sec;
3911 /* .hash section. */
3913 /* symbol version section (.gnu.version). */
3914 asection *symver_sec;
3915 /* Buffer large enough to hold contents of any section. */
3917 /* Buffer large enough to hold external relocs of any section. */
3918 PTR external_relocs;
3919 /* Buffer large enough to hold internal relocs of any section. */
3920 Elf_Internal_Rela *internal_relocs;
3921 /* Buffer large enough to hold external local symbols of any input
3923 Elf_External_Sym *external_syms;
3924 /* Buffer large enough to hold internal local symbols of any input
3926 Elf_Internal_Sym *internal_syms;
3927 /* Array large enough to hold a symbol index for each local symbol
3928 of any input BFD. */
3930 /* Array large enough to hold a section pointer for each local
3931 symbol of any input BFD. */
3932 asection **sections;
3933 /* Buffer to hold swapped out symbols. */
3934 Elf_External_Sym *symbuf;
3935 /* Number of swapped out symbols in buffer. */
3936 size_t symbuf_count;
3937 /* Number of symbols which fit in symbuf. */
3941 static boolean elf_link_output_sym
3942 PARAMS ((struct elf_final_link_info *, const char *,
3943 Elf_Internal_Sym *, asection *));
3944 static boolean elf_link_flush_output_syms
3945 PARAMS ((struct elf_final_link_info *));
3946 static boolean elf_link_output_extsym
3947 PARAMS ((struct elf_link_hash_entry *, PTR));
3948 static boolean elf_link_input_bfd
3949 PARAMS ((struct elf_final_link_info *, bfd *));
3950 static boolean elf_reloc_link_order
3951 PARAMS ((bfd *, struct bfd_link_info *, asection *,
3952 struct bfd_link_order *));
3954 /* This struct is used to pass information to elf_link_output_extsym. */
3956 struct elf_outext_info
3960 struct elf_final_link_info *finfo;
3963 /* Compute the size of, and allocate space for, REL_HDR which is the
3964 section header for a section containing relocations for O. */
3967 elf_link_size_reloc_section (abfd, rel_hdr, o)
3969 Elf_Internal_Shdr *rel_hdr;
3972 register struct elf_link_hash_entry **p, **pend;
3973 unsigned reloc_count;
3975 /* Figure out how many relocations there will be. */
3976 if (rel_hdr == &elf_section_data (o)->rel_hdr)
3977 reloc_count = elf_section_data (o)->rel_count;
3979 reloc_count = elf_section_data (o)->rel_count2;
3981 /* That allows us to calculate the size of the section. */
3982 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
3984 /* The contents field must last into write_object_contents, so we
3985 allocate it with bfd_alloc rather than malloc. */
3986 rel_hdr->contents = (PTR) bfd_alloc (abfd, rel_hdr->sh_size);
3987 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
3990 /* We only allocate one set of hash entries, so we only do it the
3991 first time we are called. */
3992 if (elf_section_data (o)->rel_hashes == NULL)
3994 p = ((struct elf_link_hash_entry **)
3995 bfd_malloc (o->reloc_count
3996 * sizeof (struct elf_link_hash_entry *)));
3997 if (p == NULL && o->reloc_count != 0)
4000 elf_section_data (o)->rel_hashes = p;
4001 pend = p + o->reloc_count;
4002 for (; p < pend; p++)
4009 /* When performing a relocateable link, the input relocations are
4010 preserved. But, if they reference global symbols, the indices
4011 referenced must be updated. Update all the relocations in
4012 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4015 elf_link_adjust_relocs (abfd, rel_hdr, count, rel_hash)
4017 Elf_Internal_Shdr *rel_hdr;
4019 struct elf_link_hash_entry **rel_hash;
4023 for (i = 0; i < count; i++, rel_hash++)
4025 if (*rel_hash == NULL)
4028 BFD_ASSERT ((*rel_hash)->indx >= 0);
4030 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
4032 Elf_External_Rel *erel;
4033 Elf_Internal_Rel irel;
4035 erel = (Elf_External_Rel *) rel_hdr->contents + i;
4036 elf_swap_reloc_in (abfd, erel, &irel);
4037 irel.r_info = ELF_R_INFO ((*rel_hash)->indx,
4038 ELF_R_TYPE (irel.r_info));
4039 elf_swap_reloc_out (abfd, &irel, erel);
4043 Elf_External_Rela *erela;
4044 Elf_Internal_Rela irela;
4046 BFD_ASSERT (rel_hdr->sh_entsize
4047 == sizeof (Elf_External_Rela));
4049 erela = (Elf_External_Rela *) rel_hdr->contents + i;
4050 elf_swap_reloca_in (abfd, erela, &irela);
4051 irela.r_info = ELF_R_INFO ((*rel_hash)->indx,
4052 ELF_R_TYPE (irela.r_info));
4053 elf_swap_reloca_out (abfd, &irela, erela);
4058 /* Do the final step of an ELF link. */
4061 elf_bfd_final_link (abfd, info)
4063 struct bfd_link_info *info;
4067 struct elf_final_link_info finfo;
4068 register asection *o;
4069 register struct bfd_link_order *p;
4071 size_t max_contents_size;
4072 size_t max_external_reloc_size;
4073 size_t max_internal_reloc_count;
4074 size_t max_sym_count;
4076 Elf_Internal_Sym elfsym;
4078 Elf_Internal_Shdr *symtab_hdr;
4079 Elf_Internal_Shdr *symstrtab_hdr;
4080 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4081 struct elf_outext_info eoinfo;
4084 abfd->flags |= DYNAMIC;
4086 dynamic = elf_hash_table (info)->dynamic_sections_created;
4087 dynobj = elf_hash_table (info)->dynobj;
4090 finfo.output_bfd = abfd;
4091 finfo.symstrtab = elf_stringtab_init ();
4092 if (finfo.symstrtab == NULL)
4097 finfo.dynsym_sec = NULL;
4098 finfo.hash_sec = NULL;
4099 finfo.symver_sec = NULL;
4103 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
4104 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
4105 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
4106 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
4107 /* Note that it is OK if symver_sec is NULL. */
4110 finfo.contents = NULL;
4111 finfo.external_relocs = NULL;
4112 finfo.internal_relocs = NULL;
4113 finfo.external_syms = NULL;
4114 finfo.internal_syms = NULL;
4115 finfo.indices = NULL;
4116 finfo.sections = NULL;
4117 finfo.symbuf = NULL;
4118 finfo.symbuf_count = 0;
4120 /* Count up the number of relocations we will output for each output
4121 section, so that we know the sizes of the reloc sections. We
4122 also figure out some maximum sizes. */
4123 max_contents_size = 0;
4124 max_external_reloc_size = 0;
4125 max_internal_reloc_count = 0;
4127 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4131 for (p = o->link_order_head; p != NULL; p = p->next)
4133 if (p->type == bfd_section_reloc_link_order
4134 || p->type == bfd_symbol_reloc_link_order)
4136 else if (p->type == bfd_indirect_link_order)
4140 sec = p->u.indirect.section;
4142 /* Mark all sections which are to be included in the
4143 link. This will normally be every section. We need
4144 to do this so that we can identify any sections which
4145 the linker has decided to not include. */
4146 sec->linker_mark = true;
4148 if (info->relocateable)
4149 o->reloc_count += sec->reloc_count;
4151 if (sec->_raw_size > max_contents_size)
4152 max_contents_size = sec->_raw_size;
4153 if (sec->_cooked_size > max_contents_size)
4154 max_contents_size = sec->_cooked_size;
4156 /* We are interested in just local symbols, not all
4158 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
4159 && (sec->owner->flags & DYNAMIC) == 0)
4163 if (elf_bad_symtab (sec->owner))
4164 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
4165 / sizeof (Elf_External_Sym));
4167 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
4169 if (sym_count > max_sym_count)
4170 max_sym_count = sym_count;
4172 if ((sec->flags & SEC_RELOC) != 0)
4176 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
4177 if (ext_size > max_external_reloc_size)
4178 max_external_reloc_size = ext_size;
4179 if (sec->reloc_count > max_internal_reloc_count)
4180 max_internal_reloc_count = sec->reloc_count;
4186 if (o->reloc_count > 0)
4187 o->flags |= SEC_RELOC;
4190 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4191 set it (this is probably a bug) and if it is set
4192 assign_section_numbers will create a reloc section. */
4193 o->flags &=~ SEC_RELOC;
4196 /* If the SEC_ALLOC flag is not set, force the section VMA to
4197 zero. This is done in elf_fake_sections as well, but forcing
4198 the VMA to 0 here will ensure that relocs against these
4199 sections are handled correctly. */
4200 if ((o->flags & SEC_ALLOC) == 0
4201 && ! o->user_set_vma)
4205 /* Figure out the file positions for everything but the symbol table
4206 and the relocs. We set symcount to force assign_section_numbers
4207 to create a symbol table. */
4208 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
4209 BFD_ASSERT (! abfd->output_has_begun);
4210 if (! _bfd_elf_compute_section_file_positions (abfd, info))
4213 /* Figure out how many relocations we will have in each section.
4214 Just using RELOC_COUNT isn't good enough since that doesn't
4215 maintain a separate value for REL vs. RELA relocations. */
4216 if (info->relocateable)
4217 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
4218 for (o = sub->sections; o != NULL; o = o->next)
4220 asection *output_section;
4222 if (! o->linker_mark)
4224 /* This section was omitted from the link. */
4228 output_section = o->output_section;
4230 if (output_section != NULL
4231 && (o->flags & SEC_RELOC) != 0)
4233 struct bfd_elf_section_data *esdi
4234 = elf_section_data (o);
4235 struct bfd_elf_section_data *esdo
4236 = elf_section_data (output_section);
4237 unsigned int *rel_count;
4238 unsigned int *rel_count2;
4240 /* We must be careful to add the relocation froms the
4241 input section to the right output count. */
4242 if (esdi->rel_hdr.sh_entsize == esdo->rel_hdr.sh_entsize)
4244 rel_count = &esdo->rel_count;
4245 rel_count2 = &esdo->rel_count2;
4249 rel_count = &esdo->rel_count2;
4250 rel_count2 = &esdo->rel_count;
4253 *rel_count += (esdi->rel_hdr.sh_size
4254 / esdi->rel_hdr.sh_entsize);
4256 *rel_count2 += (esdi->rel_hdr2->sh_size
4257 / esdi->rel_hdr2->sh_entsize);
4261 /* That created the reloc sections. Set their sizes, and assign
4262 them file positions, and allocate some buffers. */
4263 for (o = abfd->sections; o != NULL; o = o->next)
4265 if ((o->flags & SEC_RELOC) != 0)
4267 if (!elf_link_size_reloc_section (abfd,
4268 &elf_section_data (o)->rel_hdr,
4272 if (elf_section_data (o)->rel_hdr2
4273 && !elf_link_size_reloc_section (abfd,
4274 elf_section_data (o)->rel_hdr2,
4279 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4280 to count upwards while actually outputting the relocations. */
4281 elf_section_data (o)->rel_count = 0;
4282 elf_section_data (o)->rel_count2 = 0;
4285 _bfd_elf_assign_file_positions_for_relocs (abfd);
4287 /* We have now assigned file positions for all the sections except
4288 .symtab and .strtab. We start the .symtab section at the current
4289 file position, and write directly to it. We build the .strtab
4290 section in memory. */
4291 bfd_get_symcount (abfd) = 0;
4292 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4293 /* sh_name is set in prep_headers. */
4294 symtab_hdr->sh_type = SHT_SYMTAB;
4295 symtab_hdr->sh_flags = 0;
4296 symtab_hdr->sh_addr = 0;
4297 symtab_hdr->sh_size = 0;
4298 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
4299 /* sh_link is set in assign_section_numbers. */
4300 /* sh_info is set below. */
4301 /* sh_offset is set just below. */
4302 symtab_hdr->sh_addralign = 4; /* FIXME: system dependent? */
4304 off = elf_tdata (abfd)->next_file_pos;
4305 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
4307 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4308 incorrect. We do not yet know the size of the .symtab section.
4309 We correct next_file_pos below, after we do know the size. */
4311 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4312 continuously seeking to the right position in the file. */
4313 if (! info->keep_memory || max_sym_count < 20)
4314 finfo.symbuf_size = 20;
4316 finfo.symbuf_size = max_sym_count;
4317 finfo.symbuf = ((Elf_External_Sym *)
4318 bfd_malloc (finfo.symbuf_size * sizeof (Elf_External_Sym)));
4319 if (finfo.symbuf == NULL)
4322 /* Start writing out the symbol table. The first symbol is always a
4324 if (info->strip != strip_all || info->relocateable)
4326 elfsym.st_value = 0;
4329 elfsym.st_other = 0;
4330 elfsym.st_shndx = SHN_UNDEF;
4331 if (! elf_link_output_sym (&finfo, (const char *) NULL,
4332 &elfsym, bfd_und_section_ptr))
4337 /* Some standard ELF linkers do this, but we don't because it causes
4338 bootstrap comparison failures. */
4339 /* Output a file symbol for the output file as the second symbol.
4340 We output this even if we are discarding local symbols, although
4341 I'm not sure if this is correct. */
4342 elfsym.st_value = 0;
4344 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
4345 elfsym.st_other = 0;
4346 elfsym.st_shndx = SHN_ABS;
4347 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
4348 &elfsym, bfd_abs_section_ptr))
4352 /* Output a symbol for each section. We output these even if we are
4353 discarding local symbols, since they are used for relocs. These
4354 symbols have no names. We store the index of each one in the
4355 index field of the section, so that we can find it again when
4356 outputting relocs. */
4357 if (info->strip != strip_all || info->relocateable)
4360 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
4361 elfsym.st_other = 0;
4362 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
4364 o = section_from_elf_index (abfd, i);
4366 o->target_index = bfd_get_symcount (abfd);
4367 elfsym.st_shndx = i;
4368 if (info->relocateable || o == NULL)
4369 elfsym.st_value = 0;
4371 elfsym.st_value = o->vma;
4372 if (! elf_link_output_sym (&finfo, (const char *) NULL,
4378 /* Allocate some memory to hold information read in from the input
4380 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
4381 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
4382 finfo.internal_relocs = ((Elf_Internal_Rela *)
4383 bfd_malloc (max_internal_reloc_count
4384 * sizeof (Elf_Internal_Rela)
4385 * bed->s->int_rels_per_ext_rel));
4386 finfo.external_syms = ((Elf_External_Sym *)
4387 bfd_malloc (max_sym_count
4388 * sizeof (Elf_External_Sym)));
4389 finfo.internal_syms = ((Elf_Internal_Sym *)
4390 bfd_malloc (max_sym_count
4391 * sizeof (Elf_Internal_Sym)));
4392 finfo.indices = (long *) bfd_malloc (max_sym_count * sizeof (long));
4393 finfo.sections = ((asection **)
4394 bfd_malloc (max_sym_count * sizeof (asection *)));
4395 if ((finfo.contents == NULL && max_contents_size != 0)
4396 || (finfo.external_relocs == NULL && max_external_reloc_size != 0)
4397 || (finfo.internal_relocs == NULL && max_internal_reloc_count != 0)
4398 || (finfo.external_syms == NULL && max_sym_count != 0)
4399 || (finfo.internal_syms == NULL && max_sym_count != 0)
4400 || (finfo.indices == NULL && max_sym_count != 0)
4401 || (finfo.sections == NULL && max_sym_count != 0))
4404 /* Since ELF permits relocations to be against local symbols, we
4405 must have the local symbols available when we do the relocations.
4406 Since we would rather only read the local symbols once, and we
4407 would rather not keep them in memory, we handle all the
4408 relocations for a single input file at the same time.
4410 Unfortunately, there is no way to know the total number of local
4411 symbols until we have seen all of them, and the local symbol
4412 indices precede the global symbol indices. This means that when
4413 we are generating relocateable output, and we see a reloc against
4414 a global symbol, we can not know the symbol index until we have
4415 finished examining all the local symbols to see which ones we are
4416 going to output. To deal with this, we keep the relocations in
4417 memory, and don't output them until the end of the link. This is
4418 an unfortunate waste of memory, but I don't see a good way around
4419 it. Fortunately, it only happens when performing a relocateable
4420 link, which is not the common case. FIXME: If keep_memory is set
4421 we could write the relocs out and then read them again; I don't
4422 know how bad the memory loss will be. */
4424 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
4425 sub->output_has_begun = false;
4426 for (o = abfd->sections; o != NULL; o = o->next)
4428 for (p = o->link_order_head; p != NULL; p = p->next)
4430 if (p->type == bfd_indirect_link_order
4431 && (bfd_get_flavour (p->u.indirect.section->owner)
4432 == bfd_target_elf_flavour))
4434 sub = p->u.indirect.section->owner;
4435 if (! sub->output_has_begun)
4437 if (! elf_link_input_bfd (&finfo, sub))
4439 sub->output_has_begun = true;
4442 else if (p->type == bfd_section_reloc_link_order
4443 || p->type == bfd_symbol_reloc_link_order)
4445 if (! elf_reloc_link_order (abfd, info, o, p))
4450 if (! _bfd_default_link_order (abfd, info, o, p))
4456 /* That wrote out all the local symbols. Finish up the symbol table
4457 with the global symbols. */
4459 if (info->strip != strip_all && info->shared)
4461 /* Output any global symbols that got converted to local in a
4462 version script. We do this in a separate step since ELF
4463 requires all local symbols to appear prior to any global
4464 symbols. FIXME: We should only do this if some global
4465 symbols were, in fact, converted to become local. FIXME:
4466 Will this work correctly with the Irix 5 linker? */
4467 eoinfo.failed = false;
4468 eoinfo.finfo = &finfo;
4469 eoinfo.localsyms = true;
4470 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
4476 /* The sh_info field records the index of the first non local symbol. */
4477 symtab_hdr->sh_info = bfd_get_symcount (abfd);
4481 Elf_Internal_Sym sym;
4482 Elf_External_Sym *dynsym =
4483 (Elf_External_Sym *)finfo.dynsym_sec->contents;
4484 long last_local = 0;
4486 /* Write out the section symbols for the output sections. */
4493 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
4496 for (s = abfd->sections; s != NULL; s = s->next)
4499 indx = elf_section_data (s)->this_idx;
4500 BFD_ASSERT (indx > 0);
4501 sym.st_shndx = indx;
4502 sym.st_value = s->vma;
4504 elf_swap_symbol_out (abfd, &sym,
4505 dynsym + elf_section_data (s)->dynindx);
4508 last_local = bfd_count_sections (abfd);
4511 /* Write out the local dynsyms. */
4512 if (elf_hash_table (info)->dynlocal)
4514 struct elf_link_local_dynamic_entry *e;
4515 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
4519 sym.st_size = e->isym.st_size;
4520 sym.st_other = e->isym.st_other;
4522 /* Copy the internal symbol as is.
4523 Note that we saved a word of storage and overwrote
4524 the original st_name with the dynstr_index. */
4527 if (e->isym.st_shndx > 0 && e->isym.st_shndx < SHN_LORESERVE)
4529 s = bfd_section_from_elf_index (e->input_bfd,
4533 elf_section_data (s->output_section)->this_idx;
4534 sym.st_value = (s->output_section->vma
4536 + e->isym.st_value);
4539 if (last_local < e->dynindx)
4540 last_local = e->dynindx;
4542 elf_swap_symbol_out (abfd, &sym, dynsym + e->dynindx);
4546 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
4550 /* We get the global symbols from the hash table. */
4551 eoinfo.failed = false;
4552 eoinfo.localsyms = false;
4553 eoinfo.finfo = &finfo;
4554 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
4559 /* If backend needs to output some symbols not present in the hash
4560 table, do it now. */
4561 if (bed->elf_backend_output_arch_syms)
4563 if (! (*bed->elf_backend_output_arch_syms)
4564 (abfd, info, (PTR) &finfo,
4565 (boolean (*) PARAMS ((PTR, const char *,
4566 Elf_Internal_Sym *, asection *)))
4567 elf_link_output_sym))
4571 /* Flush all symbols to the file. */
4572 if (! elf_link_flush_output_syms (&finfo))
4575 /* Now we know the size of the symtab section. */
4576 off += symtab_hdr->sh_size;
4578 /* Finish up and write out the symbol string table (.strtab)
4580 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
4581 /* sh_name was set in prep_headers. */
4582 symstrtab_hdr->sh_type = SHT_STRTAB;
4583 symstrtab_hdr->sh_flags = 0;
4584 symstrtab_hdr->sh_addr = 0;
4585 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
4586 symstrtab_hdr->sh_entsize = 0;
4587 symstrtab_hdr->sh_link = 0;
4588 symstrtab_hdr->sh_info = 0;
4589 /* sh_offset is set just below. */
4590 symstrtab_hdr->sh_addralign = 1;
4592 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
4593 elf_tdata (abfd)->next_file_pos = off;
4595 if (bfd_get_symcount (abfd) > 0)
4597 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
4598 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
4602 /* Adjust the relocs to have the correct symbol indices. */
4603 for (o = abfd->sections; o != NULL; o = o->next)
4605 if ((o->flags & SEC_RELOC) == 0)
4608 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
4609 elf_section_data (o)->rel_count,
4610 elf_section_data (o)->rel_hashes);
4611 if (elf_section_data (o)->rel_hdr2 != NULL)
4612 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
4613 elf_section_data (o)->rel_count2,
4614 (elf_section_data (o)->rel_hashes
4615 + elf_section_data (o)->rel_count));
4617 /* Set the reloc_count field to 0 to prevent write_relocs from
4618 trying to swap the relocs out itself. */
4622 /* If we are linking against a dynamic object, or generating a
4623 shared library, finish up the dynamic linking information. */
4626 Elf_External_Dyn *dyncon, *dynconend;
4628 /* Fix up .dynamic entries. */
4629 o = bfd_get_section_by_name (dynobj, ".dynamic");
4630 BFD_ASSERT (o != NULL);
4632 dyncon = (Elf_External_Dyn *) o->contents;
4633 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
4634 for (; dyncon < dynconend; dyncon++)
4636 Elf_Internal_Dyn dyn;
4640 elf_swap_dyn_in (dynobj, dyncon, &dyn);
4647 name = info->init_function;
4650 name = info->fini_function;
4653 struct elf_link_hash_entry *h;
4655 h = elf_link_hash_lookup (elf_hash_table (info), name,
4656 false, false, true);
4658 && (h->root.type == bfd_link_hash_defined
4659 || h->root.type == bfd_link_hash_defweak))
4661 dyn.d_un.d_val = h->root.u.def.value;
4662 o = h->root.u.def.section;
4663 if (o->output_section != NULL)
4664 dyn.d_un.d_val += (o->output_section->vma
4665 + o->output_offset);
4668 /* The symbol is imported from another shared
4669 library and does not apply to this one. */
4673 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4688 name = ".gnu.version_d";
4691 name = ".gnu.version_r";
4694 name = ".gnu.version";
4696 o = bfd_get_section_by_name (abfd, name);
4697 BFD_ASSERT (o != NULL);
4698 dyn.d_un.d_ptr = o->vma;
4699 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4706 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
4711 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
4713 Elf_Internal_Shdr *hdr;
4715 hdr = elf_elfsections (abfd)[i];
4716 if (hdr->sh_type == type
4717 && (hdr->sh_flags & SHF_ALLOC) != 0)
4719 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
4720 dyn.d_un.d_val += hdr->sh_size;
4723 if (dyn.d_un.d_val == 0
4724 || hdr->sh_addr < dyn.d_un.d_val)
4725 dyn.d_un.d_val = hdr->sh_addr;
4729 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4735 /* If we have created any dynamic sections, then output them. */
4738 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
4741 for (o = dynobj->sections; o != NULL; o = o->next)
4743 if ((o->flags & SEC_HAS_CONTENTS) == 0
4744 || o->_raw_size == 0)
4746 if ((o->flags & SEC_LINKER_CREATED) == 0)
4748 /* At this point, we are only interested in sections
4749 created by elf_link_create_dynamic_sections. */
4752 if ((elf_section_data (o->output_section)->this_hdr.sh_type
4754 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
4756 if (! bfd_set_section_contents (abfd, o->output_section,
4757 o->contents, o->output_offset,
4765 /* The contents of the .dynstr section are actually in a
4767 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
4768 if (bfd_seek (abfd, off, SEEK_SET) != 0
4769 || ! _bfd_stringtab_emit (abfd,
4770 elf_hash_table (info)->dynstr))
4776 /* If we have optimized stabs strings, output them. */
4777 if (elf_hash_table (info)->stab_info != NULL)
4779 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
4783 if (finfo.symstrtab != NULL)
4784 _bfd_stringtab_free (finfo.symstrtab);
4785 if (finfo.contents != NULL)
4786 free (finfo.contents);
4787 if (finfo.external_relocs != NULL)
4788 free (finfo.external_relocs);
4789 if (finfo.internal_relocs != NULL)
4790 free (finfo.internal_relocs);
4791 if (finfo.external_syms != NULL)
4792 free (finfo.external_syms);
4793 if (finfo.internal_syms != NULL)
4794 free (finfo.internal_syms);
4795 if (finfo.indices != NULL)
4796 free (finfo.indices);
4797 if (finfo.sections != NULL)
4798 free (finfo.sections);
4799 if (finfo.symbuf != NULL)
4800 free (finfo.symbuf);
4801 for (o = abfd->sections; o != NULL; o = o->next)
4803 if ((o->flags & SEC_RELOC) != 0
4804 && elf_section_data (o)->rel_hashes != NULL)
4805 free (elf_section_data (o)->rel_hashes);
4808 elf_tdata (abfd)->linker = true;
4813 if (finfo.symstrtab != NULL)
4814 _bfd_stringtab_free (finfo.symstrtab);
4815 if (finfo.contents != NULL)
4816 free (finfo.contents);
4817 if (finfo.external_relocs != NULL)
4818 free (finfo.external_relocs);
4819 if (finfo.internal_relocs != NULL)
4820 free (finfo.internal_relocs);
4821 if (finfo.external_syms != NULL)
4822 free (finfo.external_syms);
4823 if (finfo.internal_syms != NULL)
4824 free (finfo.internal_syms);
4825 if (finfo.indices != NULL)
4826 free (finfo.indices);
4827 if (finfo.sections != NULL)
4828 free (finfo.sections);
4829 if (finfo.symbuf != NULL)
4830 free (finfo.symbuf);
4831 for (o = abfd->sections; o != NULL; o = o->next)
4833 if ((o->flags & SEC_RELOC) != 0
4834 && elf_section_data (o)->rel_hashes != NULL)
4835 free (elf_section_data (o)->rel_hashes);
4841 /* Add a symbol to the output symbol table. */
4844 elf_link_output_sym (finfo, name, elfsym, input_sec)
4845 struct elf_final_link_info *finfo;
4847 Elf_Internal_Sym *elfsym;
4848 asection *input_sec;
4850 boolean (*output_symbol_hook) PARAMS ((bfd *,
4851 struct bfd_link_info *info,
4856 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
4857 elf_backend_link_output_symbol_hook;
4858 if (output_symbol_hook != NULL)
4860 if (! ((*output_symbol_hook)
4861 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
4865 if (name == (const char *) NULL || *name == '\0')
4866 elfsym->st_name = 0;
4867 else if (input_sec->flags & SEC_EXCLUDE)
4868 elfsym->st_name = 0;
4871 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
4874 if (elfsym->st_name == (unsigned long) -1)
4878 if (finfo->symbuf_count >= finfo->symbuf_size)
4880 if (! elf_link_flush_output_syms (finfo))
4884 elf_swap_symbol_out (finfo->output_bfd, elfsym,
4885 (PTR) (finfo->symbuf + finfo->symbuf_count));
4886 ++finfo->symbuf_count;
4888 ++ bfd_get_symcount (finfo->output_bfd);
4893 /* Flush the output symbols to the file. */
4896 elf_link_flush_output_syms (finfo)
4897 struct elf_final_link_info *finfo;
4899 if (finfo->symbuf_count > 0)
4901 Elf_Internal_Shdr *symtab;
4903 symtab = &elf_tdata (finfo->output_bfd)->symtab_hdr;
4905 if (bfd_seek (finfo->output_bfd, symtab->sh_offset + symtab->sh_size,
4907 || (bfd_write ((PTR) finfo->symbuf, finfo->symbuf_count,
4908 sizeof (Elf_External_Sym), finfo->output_bfd)
4909 != finfo->symbuf_count * sizeof (Elf_External_Sym)))
4912 symtab->sh_size += finfo->symbuf_count * sizeof (Elf_External_Sym);
4914 finfo->symbuf_count = 0;
4920 /* Add an external symbol to the symbol table. This is called from
4921 the hash table traversal routine. When generating a shared object,
4922 we go through the symbol table twice. The first time we output
4923 anything that might have been forced to local scope in a version
4924 script. The second time we output the symbols that are still
4928 elf_link_output_extsym (h, data)
4929 struct elf_link_hash_entry *h;
4932 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
4933 struct elf_final_link_info *finfo = eoinfo->finfo;
4935 Elf_Internal_Sym sym;
4936 asection *input_sec;
4938 /* Decide whether to output this symbol in this pass. */
4939 if (eoinfo->localsyms)
4941 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
4946 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
4950 /* If we are not creating a shared library, and this symbol is
4951 referenced by a shared library but is not defined anywhere, then
4952 warn that it is undefined. If we do not do this, the runtime
4953 linker will complain that the symbol is undefined when the
4954 program is run. We don't have to worry about symbols that are
4955 referenced by regular files, because we will already have issued
4956 warnings for them. */
4957 if (! finfo->info->relocateable
4958 && ! (finfo->info->shared
4959 && !finfo->info->no_undefined)
4960 && h->root.type == bfd_link_hash_undefined
4961 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
4962 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
4964 if (! ((*finfo->info->callbacks->undefined_symbol)
4965 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
4966 (asection *) NULL, 0)))
4968 eoinfo->failed = true;
4973 /* We don't want to output symbols that have never been mentioned by
4974 a regular file, or that we have been told to strip. However, if
4975 h->indx is set to -2, the symbol is used by a reloc and we must
4979 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
4980 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
4981 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
4982 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
4984 else if (finfo->info->strip == strip_all
4985 || (finfo->info->strip == strip_some
4986 && bfd_hash_lookup (finfo->info->keep_hash,
4987 h->root.root.string,
4988 false, false) == NULL))
4993 /* If we're stripping it, and it's not a dynamic symbol, there's
4994 nothing else to do. */
4995 if (strip && h->dynindx == -1)
4999 sym.st_size = h->size;
5000 sym.st_other = h->other;
5001 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5002 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
5003 else if (h->root.type == bfd_link_hash_undefweak
5004 || h->root.type == bfd_link_hash_defweak)
5005 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
5007 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
5009 switch (h->root.type)
5012 case bfd_link_hash_new:
5016 case bfd_link_hash_undefined:
5017 input_sec = bfd_und_section_ptr;
5018 sym.st_shndx = SHN_UNDEF;
5021 case bfd_link_hash_undefweak:
5022 input_sec = bfd_und_section_ptr;
5023 sym.st_shndx = SHN_UNDEF;
5026 case bfd_link_hash_defined:
5027 case bfd_link_hash_defweak:
5029 input_sec = h->root.u.def.section;
5030 if (input_sec->output_section != NULL)
5033 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
5034 input_sec->output_section);
5035 if (sym.st_shndx == (unsigned short) -1)
5037 (*_bfd_error_handler)
5038 (_("%s: could not find output section %s for input section %s"),
5039 bfd_get_filename (finfo->output_bfd),
5040 input_sec->output_section->name,
5042 eoinfo->failed = true;
5046 /* ELF symbols in relocateable files are section relative,
5047 but in nonrelocateable files they are virtual
5049 sym.st_value = h->root.u.def.value + input_sec->output_offset;
5050 if (! finfo->info->relocateable)
5051 sym.st_value += input_sec->output_section->vma;
5055 BFD_ASSERT (input_sec->owner == NULL
5056 || (input_sec->owner->flags & DYNAMIC) != 0);
5057 sym.st_shndx = SHN_UNDEF;
5058 input_sec = bfd_und_section_ptr;
5063 case bfd_link_hash_common:
5064 input_sec = h->root.u.c.p->section;
5065 sym.st_shndx = SHN_COMMON;
5066 sym.st_value = 1 << h->root.u.c.p->alignment_power;
5069 case bfd_link_hash_indirect:
5070 /* These symbols are created by symbol versioning. They point
5071 to the decorated version of the name. For example, if the
5072 symbol foo@@GNU_1.2 is the default, which should be used when
5073 foo is used with no version, then we add an indirect symbol
5074 foo which points to foo@@GNU_1.2. We ignore these symbols,
5075 since the indirected symbol is already in the hash table. If
5076 the indirect symbol is non-ELF, fall through and output it. */
5077 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) == 0)
5081 case bfd_link_hash_warning:
5082 /* We can't represent these symbols in ELF, although a warning
5083 symbol may have come from a .gnu.warning.SYMBOL section. We
5084 just put the target symbol in the hash table. If the target
5085 symbol does not really exist, don't do anything. */
5086 if (h->root.u.i.link->type == bfd_link_hash_new)
5088 return (elf_link_output_extsym
5089 ((struct elf_link_hash_entry *) h->root.u.i.link, data));
5092 /* Give the processor backend a chance to tweak the symbol value,
5093 and also to finish up anything that needs to be done for this
5095 if ((h->dynindx != -1
5096 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5097 && elf_hash_table (finfo->info)->dynamic_sections_created)
5099 struct elf_backend_data *bed;
5101 bed = get_elf_backend_data (finfo->output_bfd);
5102 if (! ((*bed->elf_backend_finish_dynamic_symbol)
5103 (finfo->output_bfd, finfo->info, h, &sym)))
5105 eoinfo->failed = true;
5110 /* If we are marking the symbol as undefined, and there are no
5111 non-weak references to this symbol from a regular object, then
5112 mark the symbol as weak undefined; if there are non-weak
5113 references, mark the symbol as strong. We can't do this earlier,
5114 because it might not be marked as undefined until the
5115 finish_dynamic_symbol routine gets through with it. */
5116 if (sym.st_shndx == SHN_UNDEF
5117 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
5118 && (ELF_ST_BIND(sym.st_info) == STB_GLOBAL
5119 || ELF_ST_BIND(sym.st_info) == STB_WEAK))
5123 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
5124 bindtype = STB_GLOBAL;
5126 bindtype = STB_WEAK;
5127 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
5130 /* If this symbol should be put in the .dynsym section, then put it
5131 there now. We have already know the symbol index. We also fill
5132 in the entry in the .hash section. */
5133 if (h->dynindx != -1
5134 && elf_hash_table (finfo->info)->dynamic_sections_created)
5138 size_t hash_entry_size;
5139 bfd_byte *bucketpos;
5142 sym.st_name = h->dynstr_index;
5144 elf_swap_symbol_out (finfo->output_bfd, &sym,
5145 (PTR) (((Elf_External_Sym *)
5146 finfo->dynsym_sec->contents)
5149 bucketcount = elf_hash_table (finfo->info)->bucketcount;
5150 bucket = h->elf_hash_value % bucketcount;
5152 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
5153 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
5154 + (bucket + 2) * hash_entry_size);
5155 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
5156 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
5157 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
5158 ((bfd_byte *) finfo->hash_sec->contents
5159 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
5161 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
5163 Elf_Internal_Versym iversym;
5165 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
5167 if (h->verinfo.verdef == NULL)
5168 iversym.vs_vers = 0;
5170 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
5174 if (h->verinfo.vertree == NULL)
5175 iversym.vs_vers = 1;
5177 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
5180 if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
5181 iversym.vs_vers |= VERSYM_HIDDEN;
5183 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym,
5184 (((Elf_External_Versym *)
5185 finfo->symver_sec->contents)
5190 /* If we're stripping it, then it was just a dynamic symbol, and
5191 there's nothing else to do. */
5195 h->indx = bfd_get_symcount (finfo->output_bfd);
5197 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
5199 eoinfo->failed = true;
5206 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5207 originated from the section given by INPUT_REL_HDR) to the
5211 elf_link_output_relocs (output_bfd, input_section, input_rel_hdr,
5214 asection *input_section;
5215 Elf_Internal_Shdr *input_rel_hdr;
5216 Elf_Internal_Rela *internal_relocs;
5218 Elf_Internal_Rela *irela;
5219 Elf_Internal_Rela *irelaend;
5220 Elf_Internal_Shdr *output_rel_hdr;
5221 asection *output_section;
5222 unsigned int *rel_countp = NULL;
5224 output_section = input_section->output_section;
5225 output_rel_hdr = NULL;
5227 if (elf_section_data (output_section)->rel_hdr.sh_entsize
5228 == input_rel_hdr->sh_entsize)
5230 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
5231 rel_countp = &elf_section_data (output_section)->rel_count;
5233 else if (elf_section_data (output_section)->rel_hdr2
5234 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
5235 == input_rel_hdr->sh_entsize))
5237 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
5238 rel_countp = &elf_section_data (output_section)->rel_count2;
5241 BFD_ASSERT (output_rel_hdr != NULL);
5243 irela = internal_relocs;
5244 irelaend = irela + input_rel_hdr->sh_size / input_rel_hdr->sh_entsize;
5245 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
5247 Elf_External_Rel *erel;
5249 erel = ((Elf_External_Rel *) output_rel_hdr->contents + *rel_countp);
5250 for (; irela < irelaend; irela++, erel++)
5252 Elf_Internal_Rel irel;
5254 irel.r_offset = irela->r_offset;
5255 irel.r_info = irela->r_info;
5256 BFD_ASSERT (irela->r_addend == 0);
5257 elf_swap_reloc_out (output_bfd, &irel, erel);
5262 Elf_External_Rela *erela;
5264 BFD_ASSERT (input_rel_hdr->sh_entsize
5265 == sizeof (Elf_External_Rela));
5266 erela = ((Elf_External_Rela *) output_rel_hdr->contents + *rel_countp);
5267 for (; irela < irelaend; irela++, erela++)
5268 elf_swap_reloca_out (output_bfd, irela, erela);
5271 /* Bump the counter, so that we know where to add the next set of
5273 *rel_countp += input_rel_hdr->sh_size / input_rel_hdr->sh_entsize;
5276 /* Link an input file into the linker output file. This function
5277 handles all the sections and relocations of the input file at once.
5278 This is so that we only have to read the local symbols once, and
5279 don't have to keep them in memory. */
5282 elf_link_input_bfd (finfo, input_bfd)
5283 struct elf_final_link_info *finfo;
5286 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
5287 bfd *, asection *, bfd_byte *,
5288 Elf_Internal_Rela *,
5289 Elf_Internal_Sym *, asection **));
5291 Elf_Internal_Shdr *symtab_hdr;
5294 Elf_External_Sym *external_syms;
5295 Elf_External_Sym *esym;
5296 Elf_External_Sym *esymend;
5297 Elf_Internal_Sym *isym;
5299 asection **ppsection;
5301 struct elf_backend_data *bed;
5303 output_bfd = finfo->output_bfd;
5304 bed = get_elf_backend_data (output_bfd);
5305 relocate_section = bed->elf_backend_relocate_section;
5307 /* If this is a dynamic object, we don't want to do anything here:
5308 we don't want the local symbols, and we don't want the section
5310 if ((input_bfd->flags & DYNAMIC) != 0)
5313 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5314 if (elf_bad_symtab (input_bfd))
5316 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
5321 locsymcount = symtab_hdr->sh_info;
5322 extsymoff = symtab_hdr->sh_info;
5325 /* Read the local symbols. */
5326 if (symtab_hdr->contents != NULL)
5327 external_syms = (Elf_External_Sym *) symtab_hdr->contents;
5328 else if (locsymcount == 0)
5329 external_syms = NULL;
5332 external_syms = finfo->external_syms;
5333 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
5334 || (bfd_read (external_syms, sizeof (Elf_External_Sym),
5335 locsymcount, input_bfd)
5336 != locsymcount * sizeof (Elf_External_Sym)))
5340 /* Swap in the local symbols and write out the ones which we know
5341 are going into the output file. */
5342 esym = external_syms;
5343 esymend = esym + locsymcount;
5344 isym = finfo->internal_syms;
5345 pindex = finfo->indices;
5346 ppsection = finfo->sections;
5347 for (; esym < esymend; esym++, isym++, pindex++, ppsection++)
5351 Elf_Internal_Sym osym;
5353 elf_swap_symbol_in (input_bfd, esym, isym);
5356 if (elf_bad_symtab (input_bfd))
5358 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
5365 if (isym->st_shndx == SHN_UNDEF)
5366 isec = bfd_und_section_ptr;
5367 else if (isym->st_shndx > 0 && isym->st_shndx < SHN_LORESERVE)
5368 isec = section_from_elf_index (input_bfd, isym->st_shndx);
5369 else if (isym->st_shndx == SHN_ABS)
5370 isec = bfd_abs_section_ptr;
5371 else if (isym->st_shndx == SHN_COMMON)
5372 isec = bfd_com_section_ptr;
5381 /* Don't output the first, undefined, symbol. */
5382 if (esym == external_syms)
5385 /* If we are stripping all symbols, we don't want to output this
5387 if (finfo->info->strip == strip_all)
5390 /* We never output section symbols. Instead, we use the section
5391 symbol of the corresponding section in the output file. */
5392 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
5395 /* If we are discarding all local symbols, we don't want to
5396 output this one. If we are generating a relocateable output
5397 file, then some of the local symbols may be required by
5398 relocs; we output them below as we discover that they are
5400 if (finfo->info->discard == discard_all)
5403 /* If this symbol is defined in a section which we are
5404 discarding, we don't need to keep it, but note that
5405 linker_mark is only reliable for sections that have contents.
5406 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5407 as well as linker_mark. */
5408 if (isym->st_shndx > 0
5409 && isym->st_shndx < SHN_LORESERVE
5411 && ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
5412 || (! finfo->info->relocateable
5413 && (isec->flags & SEC_EXCLUDE) != 0)))
5416 /* Get the name of the symbol. */
5417 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
5422 /* See if we are discarding symbols with this name. */
5423 if ((finfo->info->strip == strip_some
5424 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
5426 || (finfo->info->discard == discard_l
5427 && bfd_is_local_label_name (input_bfd, name)))
5430 /* If we get here, we are going to output this symbol. */
5434 /* Adjust the section index for the output file. */
5435 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
5436 isec->output_section);
5437 if (osym.st_shndx == (unsigned short) -1)
5440 *pindex = bfd_get_symcount (output_bfd);
5442 /* ELF symbols in relocateable files are section relative, but
5443 in executable files they are virtual addresses. Note that
5444 this code assumes that all ELF sections have an associated
5445 BFD section with a reasonable value for output_offset; below
5446 we assume that they also have a reasonable value for
5447 output_section. Any special sections must be set up to meet
5448 these requirements. */
5449 osym.st_value += isec->output_offset;
5450 if (! finfo->info->relocateable)
5451 osym.st_value += isec->output_section->vma;
5453 if (! elf_link_output_sym (finfo, name, &osym, isec))
5457 /* Relocate the contents of each section. */
5458 for (o = input_bfd->sections; o != NULL; o = o->next)
5462 if (! o->linker_mark)
5464 /* This section was omitted from the link. */
5468 if ((o->flags & SEC_HAS_CONTENTS) == 0
5469 || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
5472 if ((o->flags & SEC_LINKER_CREATED) != 0)
5474 /* Section was created by elf_link_create_dynamic_sections
5479 /* Get the contents of the section. They have been cached by a
5480 relaxation routine. Note that o is a section in an input
5481 file, so the contents field will not have been set by any of
5482 the routines which work on output files. */
5483 if (elf_section_data (o)->this_hdr.contents != NULL)
5484 contents = elf_section_data (o)->this_hdr.contents;
5487 contents = finfo->contents;
5488 if (! bfd_get_section_contents (input_bfd, o, contents,
5489 (file_ptr) 0, o->_raw_size))
5493 if ((o->flags & SEC_RELOC) != 0)
5495 Elf_Internal_Rela *internal_relocs;
5497 /* Get the swapped relocs. */
5498 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
5499 (input_bfd, o, finfo->external_relocs,
5500 finfo->internal_relocs, false));
5501 if (internal_relocs == NULL
5502 && o->reloc_count > 0)
5505 /* Relocate the section by invoking a back end routine.
5507 The back end routine is responsible for adjusting the
5508 section contents as necessary, and (if using Rela relocs
5509 and generating a relocateable output file) adjusting the
5510 reloc addend as necessary.
5512 The back end routine does not have to worry about setting
5513 the reloc address or the reloc symbol index.
5515 The back end routine is given a pointer to the swapped in
5516 internal symbols, and can access the hash table entries
5517 for the external symbols via elf_sym_hashes (input_bfd).
5519 When generating relocateable output, the back end routine
5520 must handle STB_LOCAL/STT_SECTION symbols specially. The
5521 output symbol is going to be a section symbol
5522 corresponding to the output section, which will require
5523 the addend to be adjusted. */
5525 if (! (*relocate_section) (output_bfd, finfo->info,
5526 input_bfd, o, contents,
5528 finfo->internal_syms,
5532 if (finfo->info->relocateable)
5534 Elf_Internal_Rela *irela;
5535 Elf_Internal_Rela *irelaend;
5536 struct elf_link_hash_entry **rel_hash;
5537 Elf_Internal_Shdr *input_rel_hdr;
5539 /* Adjust the reloc addresses and symbol indices. */
5541 irela = internal_relocs;
5543 irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
5544 rel_hash = (elf_section_data (o->output_section)->rel_hashes
5545 + elf_section_data (o->output_section)->rel_count
5546 + elf_section_data (o->output_section)->rel_count2);
5547 for (; irela < irelaend; irela++, rel_hash++)
5549 unsigned long r_symndx;
5550 Elf_Internal_Sym *isym;
5553 irela->r_offset += o->output_offset;
5555 r_symndx = ELF_R_SYM (irela->r_info);
5560 if (r_symndx >= locsymcount
5561 || (elf_bad_symtab (input_bfd)
5562 && finfo->sections[r_symndx] == NULL))
5564 struct elf_link_hash_entry *rh;
5567 /* This is a reloc against a global symbol. We
5568 have not yet output all the local symbols, so
5569 we do not know the symbol index of any global
5570 symbol. We set the rel_hash entry for this
5571 reloc to point to the global hash table entry
5572 for this symbol. The symbol index is then
5573 set at the end of elf_bfd_final_link. */
5574 indx = r_symndx - extsymoff;
5575 rh = elf_sym_hashes (input_bfd)[indx];
5576 while (rh->root.type == bfd_link_hash_indirect
5577 || rh->root.type == bfd_link_hash_warning)
5578 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
5580 /* Setting the index to -2 tells
5581 elf_link_output_extsym that this symbol is
5583 BFD_ASSERT (rh->indx < 0);
5591 /* This is a reloc against a local symbol. */
5594 isym = finfo->internal_syms + r_symndx;
5595 sec = finfo->sections[r_symndx];
5596 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
5598 /* I suppose the backend ought to fill in the
5599 section of any STT_SECTION symbol against a
5600 processor specific section. If we have
5601 discarded a section, the output_section will
5602 be the absolute section. */
5604 && (bfd_is_abs_section (sec)
5605 || (sec->output_section != NULL
5606 && bfd_is_abs_section (sec->output_section))))
5608 else if (sec == NULL || sec->owner == NULL)
5610 bfd_set_error (bfd_error_bad_value);
5615 r_symndx = sec->output_section->target_index;
5616 BFD_ASSERT (r_symndx != 0);
5621 if (finfo->indices[r_symndx] == -1)
5627 if (finfo->info->strip == strip_all)
5629 /* You can't do ld -r -s. */
5630 bfd_set_error (bfd_error_invalid_operation);
5634 /* This symbol was skipped earlier, but
5635 since it is needed by a reloc, we
5636 must output it now. */
5637 link = symtab_hdr->sh_link;
5638 name = bfd_elf_string_from_elf_section (input_bfd,
5644 osec = sec->output_section;
5646 _bfd_elf_section_from_bfd_section (output_bfd,
5648 if (isym->st_shndx == (unsigned short) -1)
5651 isym->st_value += sec->output_offset;
5652 if (! finfo->info->relocateable)
5653 isym->st_value += osec->vma;
5655 finfo->indices[r_symndx] = bfd_get_symcount (output_bfd);
5657 if (! elf_link_output_sym (finfo, name, isym, sec))
5661 r_symndx = finfo->indices[r_symndx];
5664 irela->r_info = ELF_R_INFO (r_symndx,
5665 ELF_R_TYPE (irela->r_info));
5668 /* Swap out the relocs. */
5669 input_rel_hdr = &elf_section_data (o)->rel_hdr;
5670 elf_link_output_relocs (output_bfd, o,
5674 += input_rel_hdr->sh_size / input_rel_hdr->sh_entsize;
5675 input_rel_hdr = elf_section_data (o)->rel_hdr2;
5677 elf_link_output_relocs (output_bfd, o,
5683 /* Write out the modified section contents. */
5684 if (elf_section_data (o)->stab_info == NULL)
5686 if (! (o->flags & SEC_EXCLUDE) &&
5687 ! bfd_set_section_contents (output_bfd, o->output_section,
5688 contents, o->output_offset,
5689 (o->_cooked_size != 0
5696 if (! (_bfd_write_section_stabs
5697 (output_bfd, &elf_hash_table (finfo->info)->stab_info,
5698 o, &elf_section_data (o)->stab_info, contents)))
5706 /* Generate a reloc when linking an ELF file. This is a reloc
5707 requested by the linker, and does come from any input file. This
5708 is used to build constructor and destructor tables when linking
5712 elf_reloc_link_order (output_bfd, info, output_section, link_order)
5714 struct bfd_link_info *info;
5715 asection *output_section;
5716 struct bfd_link_order *link_order;
5718 reloc_howto_type *howto;
5722 struct elf_link_hash_entry **rel_hash_ptr;
5723 Elf_Internal_Shdr *rel_hdr;
5725 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
5728 bfd_set_error (bfd_error_bad_value);
5732 addend = link_order->u.reloc.p->addend;
5734 /* Figure out the symbol index. */
5735 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
5736 + elf_section_data (output_section)->rel_count
5737 + elf_section_data (output_section)->rel_count2);
5738 if (link_order->type == bfd_section_reloc_link_order)
5740 indx = link_order->u.reloc.p->u.section->target_index;
5741 BFD_ASSERT (indx != 0);
5742 *rel_hash_ptr = NULL;
5746 struct elf_link_hash_entry *h;
5748 /* Treat a reloc against a defined symbol as though it were
5749 actually against the section. */
5750 h = ((struct elf_link_hash_entry *)
5751 bfd_wrapped_link_hash_lookup (output_bfd, info,
5752 link_order->u.reloc.p->u.name,
5753 false, false, true));
5755 && (h->root.type == bfd_link_hash_defined
5756 || h->root.type == bfd_link_hash_defweak))
5760 section = h->root.u.def.section;
5761 indx = section->output_section->target_index;
5762 *rel_hash_ptr = NULL;
5763 /* It seems that we ought to add the symbol value to the
5764 addend here, but in practice it has already been added
5765 because it was passed to constructor_callback. */
5766 addend += section->output_section->vma + section->output_offset;
5770 /* Setting the index to -2 tells elf_link_output_extsym that
5771 this symbol is used by a reloc. */
5778 if (! ((*info->callbacks->unattached_reloc)
5779 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
5780 (asection *) NULL, (bfd_vma) 0)))
5786 /* If this is an inplace reloc, we must write the addend into the
5788 if (howto->partial_inplace && addend != 0)
5791 bfd_reloc_status_type rstat;
5795 size = bfd_get_reloc_size (howto);
5796 buf = (bfd_byte *) bfd_zmalloc (size);
5797 if (buf == (bfd_byte *) NULL)
5799 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
5805 case bfd_reloc_outofrange:
5807 case bfd_reloc_overflow:
5808 if (! ((*info->callbacks->reloc_overflow)
5810 (link_order->type == bfd_section_reloc_link_order
5811 ? bfd_section_name (output_bfd,
5812 link_order->u.reloc.p->u.section)
5813 : link_order->u.reloc.p->u.name),
5814 howto->name, addend, (bfd *) NULL, (asection *) NULL,
5822 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
5823 (file_ptr) link_order->offset, size);
5829 /* The address of a reloc is relative to the section in a
5830 relocateable file, and is a virtual address in an executable
5832 offset = link_order->offset;
5833 if (! info->relocateable)
5834 offset += output_section->vma;
5836 rel_hdr = &elf_section_data (output_section)->rel_hdr;
5838 if (rel_hdr->sh_type == SHT_REL)
5840 Elf_Internal_Rel irel;
5841 Elf_External_Rel *erel;
5843 irel.r_offset = offset;
5844 irel.r_info = ELF_R_INFO (indx, howto->type);
5845 erel = ((Elf_External_Rel *) rel_hdr->contents
5846 + elf_section_data (output_section)->rel_count);
5847 elf_swap_reloc_out (output_bfd, &irel, erel);
5851 Elf_Internal_Rela irela;
5852 Elf_External_Rela *erela;
5854 irela.r_offset = offset;
5855 irela.r_info = ELF_R_INFO (indx, howto->type);
5856 irela.r_addend = addend;
5857 erela = ((Elf_External_Rela *) rel_hdr->contents
5858 + elf_section_data (output_section)->rel_count);
5859 elf_swap_reloca_out (output_bfd, &irela, erela);
5862 ++elf_section_data (output_section)->rel_count;
5868 /* Allocate a pointer to live in a linker created section. */
5871 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
5873 struct bfd_link_info *info;
5874 elf_linker_section_t *lsect;
5875 struct elf_link_hash_entry *h;
5876 const Elf_Internal_Rela *rel;
5878 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
5879 elf_linker_section_pointers_t *linker_section_ptr;
5880 unsigned long r_symndx = ELF_R_SYM (rel->r_info);;
5882 BFD_ASSERT (lsect != NULL);
5884 /* Is this a global symbol? */
5887 /* Has this symbol already been allocated, if so, our work is done */
5888 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
5893 ptr_linker_section_ptr = &h->linker_section_pointer;
5894 /* Make sure this symbol is output as a dynamic symbol. */
5895 if (h->dynindx == -1)
5897 if (! elf_link_record_dynamic_symbol (info, h))
5901 if (lsect->rel_section)
5902 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
5905 else /* Allocation of a pointer to a local symbol */
5907 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
5909 /* Allocate a table to hold the local symbols if first time */
5912 unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
5913 register unsigned int i;
5915 ptr = (elf_linker_section_pointers_t **)
5916 bfd_alloc (abfd, num_symbols * sizeof (elf_linker_section_pointers_t *));
5921 elf_local_ptr_offsets (abfd) = ptr;
5922 for (i = 0; i < num_symbols; i++)
5923 ptr[i] = (elf_linker_section_pointers_t *)0;
5926 /* Has this symbol already been allocated, if so, our work is done */
5927 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
5932 ptr_linker_section_ptr = &ptr[r_symndx];
5936 /* If we are generating a shared object, we need to
5937 output a R_<xxx>_RELATIVE reloc so that the
5938 dynamic linker can adjust this GOT entry. */
5939 BFD_ASSERT (lsect->rel_section != NULL);
5940 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
5944 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5945 from internal memory. */
5946 BFD_ASSERT (ptr_linker_section_ptr != NULL);
5947 linker_section_ptr = (elf_linker_section_pointers_t *)
5948 bfd_alloc (abfd, sizeof (elf_linker_section_pointers_t));
5950 if (!linker_section_ptr)
5953 linker_section_ptr->next = *ptr_linker_section_ptr;
5954 linker_section_ptr->addend = rel->r_addend;
5955 linker_section_ptr->which = lsect->which;
5956 linker_section_ptr->written_address_p = false;
5957 *ptr_linker_section_ptr = linker_section_ptr;
5960 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
5962 linker_section_ptr->offset = lsect->section->_raw_size - lsect->hole_size + (ARCH_SIZE / 8);
5963 lsect->hole_offset += ARCH_SIZE / 8;
5964 lsect->sym_offset += ARCH_SIZE / 8;
5965 if (lsect->sym_hash) /* Bump up symbol value if needed */
5967 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
5969 fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
5970 lsect->sym_hash->root.root.string,
5971 (long)ARCH_SIZE / 8,
5972 (long)lsect->sym_hash->root.u.def.value);
5978 linker_section_ptr->offset = lsect->section->_raw_size;
5980 lsect->section->_raw_size += ARCH_SIZE / 8;
5983 fprintf (stderr, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5984 lsect->name, (long)linker_section_ptr->offset, (long)lsect->section->_raw_size);
5992 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5995 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5998 /* Fill in the address for a pointer generated in alinker section. */
6001 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h, relocation, rel, relative_reloc)
6004 struct bfd_link_info *info;
6005 elf_linker_section_t *lsect;
6006 struct elf_link_hash_entry *h;
6008 const Elf_Internal_Rela *rel;
6011 elf_linker_section_pointers_t *linker_section_ptr;
6013 BFD_ASSERT (lsect != NULL);
6015 if (h != NULL) /* global symbol */
6017 linker_section_ptr = _bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
6021 BFD_ASSERT (linker_section_ptr != NULL);
6023 if (! elf_hash_table (info)->dynamic_sections_created
6026 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
6028 /* This is actually a static link, or it is a
6029 -Bsymbolic link and the symbol is defined
6030 locally. We must initialize this entry in the
6033 When doing a dynamic link, we create a .rela.<xxx>
6034 relocation entry to initialize the value. This
6035 is done in the finish_dynamic_symbol routine. */
6036 if (!linker_section_ptr->written_address_p)
6038 linker_section_ptr->written_address_p = true;
6039 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
6040 lsect->section->contents + linker_section_ptr->offset);
6044 else /* local symbol */
6046 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
6047 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
6048 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
6049 linker_section_ptr = _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd)[r_symndx],
6053 BFD_ASSERT (linker_section_ptr != NULL);
6055 /* Write out pointer if it hasn't been rewritten out before */
6056 if (!linker_section_ptr->written_address_p)
6058 linker_section_ptr->written_address_p = true;
6059 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
6060 lsect->section->contents + linker_section_ptr->offset);
6064 asection *srel = lsect->rel_section;
6065 Elf_Internal_Rela outrel;
6067 /* We need to generate a relative reloc for the dynamic linker. */
6069 lsect->rel_section = srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
6072 BFD_ASSERT (srel != NULL);
6074 outrel.r_offset = (lsect->section->output_section->vma
6075 + lsect->section->output_offset
6076 + linker_section_ptr->offset);
6077 outrel.r_info = ELF_R_INFO (0, relative_reloc);
6078 outrel.r_addend = 0;
6079 elf_swap_reloca_out (output_bfd, &outrel,
6080 (((Elf_External_Rela *)
6081 lsect->section->contents)
6082 + elf_section_data (lsect->section)->rel_count));
6083 ++elf_section_data (lsect->section)->rel_count;
6088 relocation = (lsect->section->output_offset
6089 + linker_section_ptr->offset
6090 - lsect->hole_offset
6091 - lsect->sym_offset);
6094 fprintf (stderr, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
6095 lsect->name, (long)relocation, (long)relocation);
6098 /* Subtract out the addend, because it will get added back in by the normal
6100 return relocation - linker_section_ptr->addend;
6103 /* Garbage collect unused sections. */
6105 static boolean elf_gc_mark
6106 PARAMS ((struct bfd_link_info *info, asection *sec,
6107 asection * (*gc_mark_hook)
6108 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
6109 struct elf_link_hash_entry *, Elf_Internal_Sym *))));
6111 static boolean elf_gc_sweep
6112 PARAMS ((struct bfd_link_info *info,
6113 boolean (*gc_sweep_hook)
6114 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
6115 const Elf_Internal_Rela *relocs))));
6117 static boolean elf_gc_sweep_symbol
6118 PARAMS ((struct elf_link_hash_entry *h, PTR idxptr));
6120 static boolean elf_gc_allocate_got_offsets
6121 PARAMS ((struct elf_link_hash_entry *h, PTR offarg));
6123 static boolean elf_gc_propagate_vtable_entries_used
6124 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
6126 static boolean elf_gc_smash_unused_vtentry_relocs
6127 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
6129 /* The mark phase of garbage collection. For a given section, mark
6130 it, and all the sections which define symbols to which it refers. */
6133 elf_gc_mark (info, sec, gc_mark_hook)
6134 struct bfd_link_info *info;
6136 asection * (*gc_mark_hook)
6137 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
6138 struct elf_link_hash_entry *, Elf_Internal_Sym *));
6144 /* Look through the section relocs. */
6146 if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
6148 Elf_Internal_Rela *relstart, *rel, *relend;
6149 Elf_Internal_Shdr *symtab_hdr;
6150 struct elf_link_hash_entry **sym_hashes;
6153 Elf_External_Sym *locsyms, *freesyms = NULL;
6154 bfd *input_bfd = sec->owner;
6155 struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
6157 /* GCFIXME: how to arrange so that relocs and symbols are not
6158 reread continually? */
6160 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
6161 sym_hashes = elf_sym_hashes (input_bfd);
6163 /* Read the local symbols. */
6164 if (elf_bad_symtab (input_bfd))
6166 nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6170 extsymoff = nlocsyms = symtab_hdr->sh_info;
6171 if (symtab_hdr->contents)
6172 locsyms = (Elf_External_Sym *) symtab_hdr->contents;
6173 else if (nlocsyms == 0)
6177 locsyms = freesyms =
6178 bfd_malloc (nlocsyms * sizeof (Elf_External_Sym));
6179 if (freesyms == NULL
6180 || bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
6181 || (bfd_read (locsyms, sizeof (Elf_External_Sym),
6182 nlocsyms, input_bfd)
6183 != nlocsyms * sizeof (Elf_External_Sym)))
6190 /* Read the relocations. */
6191 relstart = (NAME(_bfd_elf,link_read_relocs)
6192 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL,
6193 info->keep_memory));
6194 if (relstart == NULL)
6199 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
6201 for (rel = relstart; rel < relend; rel++)
6203 unsigned long r_symndx;
6205 struct elf_link_hash_entry *h;
6208 r_symndx = ELF_R_SYM (rel->r_info);
6212 if (elf_bad_symtab (sec->owner))
6214 elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
6215 if (ELF_ST_BIND (s.st_info) == STB_LOCAL)
6216 rsec = (*gc_mark_hook)(sec->owner, info, rel, NULL, &s);
6219 h = sym_hashes[r_symndx - extsymoff];
6220 rsec = (*gc_mark_hook)(sec->owner, info, rel, h, NULL);
6223 else if (r_symndx >= nlocsyms)
6225 h = sym_hashes[r_symndx - extsymoff];
6226 rsec = (*gc_mark_hook)(sec->owner, info, rel, h, NULL);
6230 elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
6231 rsec = (*gc_mark_hook)(sec->owner, info, rel, NULL, &s);
6234 if (rsec && !rsec->gc_mark)
6235 if (!elf_gc_mark (info, rsec, gc_mark_hook))
6243 if (!info->keep_memory)
6253 /* The sweep phase of garbage collection. Remove all garbage sections. */
6256 elf_gc_sweep (info, gc_sweep_hook)
6257 struct bfd_link_info *info;
6258 boolean (*gc_sweep_hook)
6259 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
6260 const Elf_Internal_Rela *relocs));
6264 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
6268 for (o = sub->sections; o != NULL; o = o->next)
6270 /* Keep special sections. Keep .debug sections. */
6271 if ((o->flags & SEC_LINKER_CREATED)
6272 || (o->flags & SEC_DEBUGGING))
6278 /* Skip sweeping sections already excluded. */
6279 if (o->flags & SEC_EXCLUDE)
6282 /* Since this is early in the link process, it is simple
6283 to remove a section from the output. */
6284 o->flags |= SEC_EXCLUDE;
6286 /* But we also have to update some of the relocation
6287 info we collected before. */
6289 && (o->flags & SEC_RELOC) && o->reloc_count > 0)
6291 Elf_Internal_Rela *internal_relocs;
6294 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
6295 (o->owner, o, NULL, NULL, info->keep_memory));
6296 if (internal_relocs == NULL)
6299 r = (*gc_sweep_hook)(o->owner, info, o, internal_relocs);
6301 if (!info->keep_memory)
6302 free (internal_relocs);
6310 /* Remove the symbols that were in the swept sections from the dynamic
6311 symbol table. GCFIXME: Anyone know how to get them out of the
6312 static symbol table as well? */
6316 elf_link_hash_traverse (elf_hash_table (info),
6317 elf_gc_sweep_symbol,
6320 elf_hash_table (info)->dynsymcount = i;
6326 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6329 elf_gc_sweep_symbol (h, idxptr)
6330 struct elf_link_hash_entry *h;
6333 int *idx = (int *) idxptr;
6335 if (h->dynindx != -1
6336 && ((h->root.type != bfd_link_hash_defined
6337 && h->root.type != bfd_link_hash_defweak)
6338 || h->root.u.def.section->gc_mark))
6339 h->dynindx = (*idx)++;
6344 /* Propogate collected vtable information. This is called through
6345 elf_link_hash_traverse. */
6348 elf_gc_propagate_vtable_entries_used (h, okp)
6349 struct elf_link_hash_entry *h;
6352 /* Those that are not vtables. */
6353 if (h->vtable_parent == NULL)
6356 /* Those vtables that do not have parents, we cannot merge. */
6357 if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
6360 /* If we've already been done, exit. */
6361 if (h->vtable_entries_used && h->vtable_entries_used[-1])
6364 /* Make sure the parent's table is up to date. */
6365 elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
6367 if (h->vtable_entries_used == NULL)
6369 /* None of this table's entries were referenced. Re-use the
6371 h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
6372 h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
6379 /* Or the parent's entries into ours. */
6380 cu = h->vtable_entries_used;
6382 pu = h->vtable_parent->vtable_entries_used;
6385 n = h->vtable_parent->vtable_entries_size / FILE_ALIGN;
6388 if (*pu) *cu = true;
6398 elf_gc_smash_unused_vtentry_relocs (h, okp)
6399 struct elf_link_hash_entry *h;
6403 bfd_vma hstart, hend;
6404 Elf_Internal_Rela *relstart, *relend, *rel;
6405 struct elf_backend_data *bed;
6407 /* Take care of both those symbols that do not describe vtables as
6408 well as those that are not loaded. */
6409 if (h->vtable_parent == NULL)
6412 BFD_ASSERT (h->root.type == bfd_link_hash_defined
6413 || h->root.type == bfd_link_hash_defweak);
6415 sec = h->root.u.def.section;
6416 hstart = h->root.u.def.value;
6417 hend = hstart + h->size;
6419 relstart = (NAME(_bfd_elf,link_read_relocs)
6420 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true));
6422 return *(boolean *)okp = false;
6423 bed = get_elf_backend_data (sec->owner);
6424 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
6426 for (rel = relstart; rel < relend; ++rel)
6427 if (rel->r_offset >= hstart && rel->r_offset < hend)
6429 /* If the entry is in use, do nothing. */
6430 if (h->vtable_entries_used
6431 && (rel->r_offset - hstart) < h->vtable_entries_size)
6433 bfd_vma entry = (rel->r_offset - hstart) / FILE_ALIGN;
6434 if (h->vtable_entries_used[entry])
6437 /* Otherwise, kill it. */
6438 rel->r_offset = rel->r_info = rel->r_addend = 0;
6444 /* Do mark and sweep of unused sections. */
6447 elf_gc_sections (abfd, info)
6449 struct bfd_link_info *info;
6453 asection * (*gc_mark_hook)
6454 PARAMS ((bfd *abfd, struct bfd_link_info *, Elf_Internal_Rela *,
6455 struct elf_link_hash_entry *h, Elf_Internal_Sym *));
6457 if (!get_elf_backend_data (abfd)->can_gc_sections
6458 || info->relocateable
6459 || elf_hash_table (info)->dynamic_sections_created)
6462 /* Apply transitive closure to the vtable entry usage info. */
6463 elf_link_hash_traverse (elf_hash_table (info),
6464 elf_gc_propagate_vtable_entries_used,
6469 /* Kill the vtable relocations that were not used. */
6470 elf_link_hash_traverse (elf_hash_table (info),
6471 elf_gc_smash_unused_vtentry_relocs,
6476 /* Grovel through relocs to find out who stays ... */
6478 gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
6479 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
6482 for (o = sub->sections; o != NULL; o = o->next)
6484 if (o->flags & SEC_KEEP)
6485 if (!elf_gc_mark (info, o, gc_mark_hook))
6490 /* ... and mark SEC_EXCLUDE for those that go. */
6491 if (!elf_gc_sweep(info, get_elf_backend_data (abfd)->gc_sweep_hook))
6497 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6500 elf_gc_record_vtinherit (abfd, sec, h, offset)
6503 struct elf_link_hash_entry *h;
6506 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
6507 struct elf_link_hash_entry **search, *child;
6508 bfd_size_type extsymcount;
6510 /* The sh_info field of the symtab header tells us where the
6511 external symbols start. We don't care about the local symbols at
6513 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
6514 if (!elf_bad_symtab (abfd))
6515 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
6517 sym_hashes = elf_sym_hashes (abfd);
6518 sym_hashes_end = sym_hashes + extsymcount;
6520 /* Hunt down the child symbol, which is in this section at the same
6521 offset as the relocation. */
6522 for (search = sym_hashes; search != sym_hashes_end; ++search)
6524 if ((child = *search) != NULL
6525 && (child->root.type == bfd_link_hash_defined
6526 || child->root.type == bfd_link_hash_defweak)
6527 && child->root.u.def.section == sec
6528 && child->root.u.def.value == offset)
6532 (*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
6533 bfd_get_filename (abfd), sec->name,
6534 (unsigned long)offset);
6535 bfd_set_error (bfd_error_invalid_operation);
6541 /* This *should* only be the absolute section. It could potentially
6542 be that someone has defined a non-global vtable though, which
6543 would be bad. It isn't worth paging in the local symbols to be
6544 sure though; that case should simply be handled by the assembler. */
6546 child->vtable_parent = (struct elf_link_hash_entry *) -1;
6549 child->vtable_parent = h;
6554 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6557 elf_gc_record_vtentry (abfd, sec, h, addend)
6558 bfd *abfd ATTRIBUTE_UNUSED;
6559 asection *sec ATTRIBUTE_UNUSED;
6560 struct elf_link_hash_entry *h;
6563 if (addend >= h->vtable_entries_size)
6566 boolean *ptr = h->vtable_entries_used;
6568 /* While the symbol is undefined, we have to be prepared to handle
6570 if (h->root.type == bfd_link_hash_undefined)
6577 /* Oops! We've got a reference past the defined end of
6578 the table. This is probably a bug -- shall we warn? */
6583 /* Allocate one extra entry for use as a "done" flag for the
6584 consolidation pass. */
6585 bytes = (size / FILE_ALIGN + 1) * sizeof (boolean);
6589 ptr = bfd_realloc (ptr - 1, bytes);
6595 oldbytes = (h->vtable_entries_size/FILE_ALIGN + 1) * sizeof (boolean);
6596 memset (((char *)ptr) + oldbytes, 0, bytes - oldbytes);
6600 ptr = bfd_zmalloc (bytes);
6605 /* And arrange for that done flag to be at index -1. */
6606 h->vtable_entries_used = ptr + 1;
6607 h->vtable_entries_size = size;
6610 h->vtable_entries_used[addend / FILE_ALIGN] = true;
6615 /* And an accompanying bit to work out final got entry offsets once
6616 we're done. Should be called from final_link. */
6619 elf_gc_common_finalize_got_offsets (abfd, info)
6621 struct bfd_link_info *info;
6624 struct elf_backend_data *bed = get_elf_backend_data (abfd);
6627 /* The GOT offset is relative to the .got section, but the GOT header is
6628 put into the .got.plt section, if the backend uses it. */
6629 if (bed->want_got_plt)
6632 gotoff = bed->got_header_size;
6634 /* Do the local .got entries first. */
6635 for (i = info->input_bfds; i; i = i->link_next)
6637 bfd_signed_vma *local_got = elf_local_got_refcounts (i);
6638 bfd_size_type j, locsymcount;
6639 Elf_Internal_Shdr *symtab_hdr;
6644 symtab_hdr = &elf_tdata (i)->symtab_hdr;
6645 if (elf_bad_symtab (i))
6646 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6648 locsymcount = symtab_hdr->sh_info;
6650 for (j = 0; j < locsymcount; ++j)
6652 if (local_got[j] > 0)
6654 local_got[j] = gotoff;
6655 gotoff += ARCH_SIZE / 8;
6658 local_got[j] = (bfd_vma) -1;
6662 /* Then the global .got and .plt entries. */
6663 elf_link_hash_traverse (elf_hash_table (info),
6664 elf_gc_allocate_got_offsets,
6669 /* We need a special top-level link routine to convert got reference counts
6670 to real got offsets. */
6673 elf_gc_allocate_got_offsets (h, offarg)
6674 struct elf_link_hash_entry *h;
6677 bfd_vma *off = (bfd_vma *) offarg;
6679 if (h->got.refcount > 0)
6681 h->got.offset = off[0];
6682 off[0] += ARCH_SIZE / 8;
6685 h->got.offset = (bfd_vma) -1;
6690 /* Many folk need no more in the way of final link than this, once
6691 got entry reference counting is enabled. */
6694 elf_gc_common_final_link (abfd, info)
6696 struct bfd_link_info *info;
6698 if (!elf_gc_common_finalize_got_offsets (abfd, info))
6701 /* Invoke the regular ELF backend linker to do all the work. */
6702 return elf_bfd_final_link (abfd, info);
6705 /* This function will be called though elf_link_hash_traverse to store
6706 all hash value of the exported symbols in an array. */
6709 elf_collect_hash_codes (h, data)
6710 struct elf_link_hash_entry *h;
6713 unsigned long **valuep = (unsigned long **) data;
6719 /* Ignore indirect symbols. These are added by the versioning code. */
6720 if (h->dynindx == -1)
6723 name = h->root.root.string;
6724 p = strchr (name, ELF_VER_CHR);
6727 alc = bfd_malloc (p - name + 1);
6728 memcpy (alc, name, p - name);
6729 alc[p - name] = '\0';
6733 /* Compute the hash value. */
6734 ha = bfd_elf_hash (name);
6736 /* Store the found hash value in the array given as the argument. */
6739 /* And store it in the struct so that we can put it in the hash table
6741 h->elf_hash_value = ha;