2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* ELF linker code. */
23 /* This struct is used to pass information to routines called via
24 elf_link_hash_traverse which must return failure. */
26 struct elf_info_failed
29 struct bfd_link_info *info;
32 static boolean elf_link_add_object_symbols
33 PARAMS ((bfd *, struct bfd_link_info *));
34 static boolean elf_link_add_archive_symbols
35 PARAMS ((bfd *, struct bfd_link_info *));
36 static boolean elf_merge_symbol
37 PARAMS ((bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
38 asection **, bfd_vma *, struct elf_link_hash_entry **,
39 boolean *, boolean *, boolean *, boolean));
40 static boolean elf_export_symbol
41 PARAMS ((struct elf_link_hash_entry *, PTR));
42 static boolean elf_fix_symbol_flags
43 PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *));
44 static boolean elf_adjust_dynamic_symbol
45 PARAMS ((struct elf_link_hash_entry *, PTR));
46 static boolean elf_link_find_version_dependencies
47 PARAMS ((struct elf_link_hash_entry *, PTR));
48 static boolean elf_link_find_version_dependencies
49 PARAMS ((struct elf_link_hash_entry *, PTR));
50 static boolean elf_link_assign_sym_version
51 PARAMS ((struct elf_link_hash_entry *, PTR));
52 static boolean elf_collect_hash_codes
53 PARAMS ((struct elf_link_hash_entry *, PTR));
54 static boolean elf_link_read_relocs_from_section
55 PARAMS ((bfd *, Elf_Internal_Shdr *, PTR, Elf_Internal_Rela *));
56 static void elf_link_output_relocs
57 PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *));
58 static boolean elf_link_size_reloc_section
59 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
60 static void elf_link_adjust_relocs
61 PARAMS ((bfd *, Elf_Internal_Shdr *, unsigned int,
62 struct elf_link_hash_entry **));
64 /* Given an ELF BFD, add symbols to the global hash table as
68 elf_bfd_link_add_symbols (abfd, info)
70 struct bfd_link_info *info;
72 switch (bfd_get_format (abfd))
75 return elf_link_add_object_symbols (abfd, info);
77 return elf_link_add_archive_symbols (abfd, info);
79 bfd_set_error (bfd_error_wrong_format);
84 /* Return true iff this is a non-common, definition of a non-function symbol. */
86 is_global_data_symbol_definition (abfd, sym)
87 bfd * abfd ATTRIBUTE_UNUSED;
88 Elf_Internal_Sym * sym;
90 /* Local symbols do not count, but target specific ones might. */
91 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
92 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
95 /* Function symbols do not count. */
96 if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
99 /* If the section is undefined, then so is the symbol. */
100 if (sym->st_shndx == SHN_UNDEF)
103 /* If the symbol is defined in the common section, then
104 it is a common definition and so does not count. */
105 if (sym->st_shndx == SHN_COMMON)
108 /* If the symbol is in a target specific section then we
109 must rely upon the backend to tell us what it is. */
110 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
111 /* FIXME - this function is not coded yet:
113 return _bfd_is_global_symbol_definition (abfd, sym);
115 Instead for now assume that the definition is not global,
116 Even if this is wrong, at least the linker will behave
117 in the same way that it used to do. */
123 /* Search the symbol table of the archive element of the archive ABFD
124 whoes archive map contains a mention of SYMDEF, and determine if
125 the symbol is defined in this element. */
127 elf_link_is_defined_archive_symbol (abfd, symdef)
131 Elf_Internal_Shdr * hdr;
132 Elf_External_Sym * esym;
133 Elf_External_Sym * esymend;
134 Elf_External_Sym * buf = NULL;
138 boolean result = false;
140 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
141 if (abfd == (bfd *) NULL)
144 if (! bfd_check_format (abfd, bfd_object))
147 /* If we have already included the element containing this symbol in the
148 link then we do not need to include it again. Just claim that any symbol
149 it contains is not a definition, so that our caller will not decide to
150 (re)include this element. */
151 if (abfd->archive_pass)
154 /* Select the appropriate symbol table. */
155 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
156 hdr = &elf_tdata (abfd)->symtab_hdr;
158 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
160 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
162 /* The sh_info field of the symtab header tells us where the
163 external symbols start. We don't care about the local symbols. */
164 if (elf_bad_symtab (abfd))
166 extsymcount = symcount;
171 extsymcount = symcount - hdr->sh_info;
172 extsymoff = hdr->sh_info;
175 buf = ((Elf_External_Sym *)
176 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
177 if (buf == NULL && extsymcount != 0)
180 /* Read in the symbol table.
181 FIXME: This ought to be cached somewhere. */
183 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
185 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
186 != extsymcount * sizeof (Elf_External_Sym)))
192 /* Scan the symbol table looking for SYMDEF. */
193 esymend = buf + extsymcount;
198 Elf_Internal_Sym sym;
201 elf_swap_symbol_in (abfd, esym, & sym);
203 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
204 if (name == (const char *) NULL)
207 if (strcmp (name, symdef->name) == 0)
209 result = is_global_data_symbol_definition (abfd, & sym);
219 /* Add symbols from an ELF archive file to the linker hash table. We
220 don't use _bfd_generic_link_add_archive_symbols because of a
221 problem which arises on UnixWare. The UnixWare libc.so is an
222 archive which includes an entry libc.so.1 which defines a bunch of
223 symbols. The libc.so archive also includes a number of other
224 object files, which also define symbols, some of which are the same
225 as those defined in libc.so.1. Correct linking requires that we
226 consider each object file in turn, and include it if it defines any
227 symbols we need. _bfd_generic_link_add_archive_symbols does not do
228 this; it looks through the list of undefined symbols, and includes
229 any object file which defines them. When this algorithm is used on
230 UnixWare, it winds up pulling in libc.so.1 early and defining a
231 bunch of symbols. This means that some of the other objects in the
232 archive are not included in the link, which is incorrect since they
233 precede libc.so.1 in the archive.
235 Fortunately, ELF archive handling is simpler than that done by
236 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
237 oddities. In ELF, if we find a symbol in the archive map, and the
238 symbol is currently undefined, we know that we must pull in that
241 Unfortunately, we do have to make multiple passes over the symbol
242 table until nothing further is resolved. */
245 elf_link_add_archive_symbols (abfd, info)
247 struct bfd_link_info *info;
250 boolean *defined = NULL;
251 boolean *included = NULL;
255 if (! bfd_has_map (abfd))
257 /* An empty archive is a special case. */
258 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
260 bfd_set_error (bfd_error_no_armap);
264 /* Keep track of all symbols we know to be already defined, and all
265 files we know to be already included. This is to speed up the
266 second and subsequent passes. */
267 c = bfd_ardata (abfd)->symdef_count;
270 defined = (boolean *) bfd_malloc (c * sizeof (boolean));
271 included = (boolean *) bfd_malloc (c * sizeof (boolean));
272 if (defined == (boolean *) NULL || included == (boolean *) NULL)
274 memset (defined, 0, c * sizeof (boolean));
275 memset (included, 0, c * sizeof (boolean));
277 symdefs = bfd_ardata (abfd)->symdefs;
290 symdefend = symdef + c;
291 for (i = 0; symdef < symdefend; symdef++, i++)
293 struct elf_link_hash_entry *h;
295 struct bfd_link_hash_entry *undefs_tail;
298 if (defined[i] || included[i])
300 if (symdef->file_offset == last)
306 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
307 false, false, false);
313 /* If this is a default version (the name contains @@),
314 look up the symbol again without the version. The
315 effect is that references to the symbol without the
316 version will be matched by the default symbol in the
319 p = strchr (symdef->name, ELF_VER_CHR);
320 if (p == NULL || p[1] != ELF_VER_CHR)
323 copy = bfd_alloc (abfd, p - symdef->name + 1);
326 memcpy (copy, symdef->name, p - symdef->name);
327 copy[p - symdef->name] = '\0';
329 h = elf_link_hash_lookup (elf_hash_table (info), copy,
330 false, false, false);
332 bfd_release (abfd, copy);
338 if (h->root.type == bfd_link_hash_common)
340 /* We currently have a common symbol. The archive map contains
341 a reference to this symbol, so we may want to include it. We
342 only want to include it however, if this archive element
343 contains a definition of the symbol, not just another common
346 Unfortunately some archivers (including GNU ar) will put
347 declarations of common symbols into their archive maps, as
348 well as real definitions, so we cannot just go by the archive
349 map alone. Instead we must read in the element's symbol
350 table and check that to see what kind of symbol definition
352 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
355 else if (h->root.type != bfd_link_hash_undefined)
357 if (h->root.type != bfd_link_hash_undefweak)
362 /* We need to include this archive member. */
363 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
364 if (element == (bfd *) NULL)
367 if (! bfd_check_format (element, bfd_object))
370 /* Doublecheck that we have not included this object
371 already--it should be impossible, but there may be
372 something wrong with the archive. */
373 if (element->archive_pass != 0)
375 bfd_set_error (bfd_error_bad_value);
378 element->archive_pass = 1;
380 undefs_tail = info->hash->undefs_tail;
382 if (! (*info->callbacks->add_archive_element) (info, element,
385 if (! elf_link_add_object_symbols (element, info))
388 /* If there are any new undefined symbols, we need to make
389 another pass through the archive in order to see whether
390 they can be defined. FIXME: This isn't perfect, because
391 common symbols wind up on undefs_tail and because an
392 undefined symbol which is defined later on in this pass
393 does not require another pass. This isn't a bug, but it
394 does make the code less efficient than it could be. */
395 if (undefs_tail != info->hash->undefs_tail)
398 /* Look backward to mark all symbols from this object file
399 which we have already seen in this pass. */
403 included[mark] = true;
408 while (symdefs[mark].file_offset == symdef->file_offset);
410 /* We mark subsequent symbols from this object file as we go
411 on through the loop. */
412 last = symdef->file_offset;
423 if (defined != (boolean *) NULL)
425 if (included != (boolean *) NULL)
430 /* This function is called when we want to define a new symbol. It
431 handles the various cases which arise when we find a definition in
432 a dynamic object, or when there is already a definition in a
433 dynamic object. The new symbol is described by NAME, SYM, PSEC,
434 and PVALUE. We set SYM_HASH to the hash table entry. We set
435 OVERRIDE if the old symbol is overriding a new definition. We set
436 TYPE_CHANGE_OK if it is OK for the type to change. We set
437 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
438 change, we mean that we shouldn't warn if the type or size does
439 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
443 elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash,
444 override, type_change_ok, size_change_ok, dt_needed)
446 struct bfd_link_info *info;
448 Elf_Internal_Sym *sym;
451 struct elf_link_hash_entry **sym_hash;
453 boolean *type_change_ok;
454 boolean *size_change_ok;
458 struct elf_link_hash_entry *h;
461 boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
466 bind = ELF_ST_BIND (sym->st_info);
468 if (! bfd_is_und_section (sec))
469 h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false);
471 h = ((struct elf_link_hash_entry *)
472 bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false));
477 /* This code is for coping with dynamic objects, and is only useful
478 if we are doing an ELF link. */
479 if (info->hash->creator != abfd->xvec)
482 /* For merging, we only care about real symbols. */
484 while (h->root.type == bfd_link_hash_indirect
485 || h->root.type == bfd_link_hash_warning)
486 h = (struct elf_link_hash_entry *) h->root.u.i.link;
488 /* If we just created the symbol, mark it as being an ELF symbol.
489 Other than that, there is nothing to do--there is no merge issue
490 with a newly defined symbol--so we just return. */
492 if (h->root.type == bfd_link_hash_new)
494 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
498 /* OLDBFD is a BFD associated with the existing symbol. */
500 switch (h->root.type)
506 case bfd_link_hash_undefined:
507 case bfd_link_hash_undefweak:
508 oldbfd = h->root.u.undef.abfd;
511 case bfd_link_hash_defined:
512 case bfd_link_hash_defweak:
513 oldbfd = h->root.u.def.section->owner;
516 case bfd_link_hash_common:
517 oldbfd = h->root.u.c.p->section->owner;
521 /* In cases involving weak versioned symbols, we may wind up trying
522 to merge a symbol with itself. Catch that here, to avoid the
523 confusion that results if we try to override a symbol with
524 itself. The additional tests catch cases like
525 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
526 dynamic object, which we do want to handle here. */
528 && ((abfd->flags & DYNAMIC) == 0
529 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))
532 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
533 respectively, is from a dynamic object. */
535 if ((abfd->flags & DYNAMIC) != 0)
541 olddyn = (oldbfd->flags & DYNAMIC) != 0;
546 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
547 indices used by MIPS ELF. */
548 switch (h->root.type)
554 case bfd_link_hash_defined:
555 case bfd_link_hash_defweak:
556 hsec = h->root.u.def.section;
559 case bfd_link_hash_common:
560 hsec = h->root.u.c.p->section;
567 olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0;
570 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
571 respectively, appear to be a definition rather than reference. */
573 if (bfd_is_und_section (sec) || bfd_is_com_section (sec))
578 if (h->root.type == bfd_link_hash_undefined
579 || h->root.type == bfd_link_hash_undefweak
580 || h->root.type == bfd_link_hash_common)
585 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
586 symbol, respectively, appears to be a common symbol in a dynamic
587 object. If a symbol appears in an uninitialized section, and is
588 not weak, and is not a function, then it may be a common symbol
589 which was resolved when the dynamic object was created. We want
590 to treat such symbols specially, because they raise special
591 considerations when setting the symbol size: if the symbol
592 appears as a common symbol in a regular object, and the size in
593 the regular object is larger, we must make sure that we use the
594 larger size. This problematic case can always be avoided in C,
595 but it must be handled correctly when using Fortran shared
598 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
599 likewise for OLDDYNCOMMON and OLDDEF.
601 Note that this test is just a heuristic, and that it is quite
602 possible to have an uninitialized symbol in a shared object which
603 is really a definition, rather than a common symbol. This could
604 lead to some minor confusion when the symbol really is a common
605 symbol in some regular object. However, I think it will be
610 && (sec->flags & SEC_ALLOC) != 0
611 && (sec->flags & SEC_LOAD) == 0
614 && ELF_ST_TYPE (sym->st_info) != STT_FUNC)
617 newdyncommon = false;
621 && h->root.type == bfd_link_hash_defined
622 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
623 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
624 && (h->root.u.def.section->flags & SEC_LOAD) == 0
626 && h->type != STT_FUNC)
629 olddyncommon = false;
631 /* It's OK to change the type if either the existing symbol or the
632 new symbol is weak unless it comes from a DT_NEEDED entry of
633 a shared object, in which case, the DT_NEEDED entry may not be
634 required at the run time. */
636 if ((! dt_needed && h->root.type == bfd_link_hash_defweak)
637 || h->root.type == bfd_link_hash_undefweak
639 *type_change_ok = true;
641 /* It's OK to change the size if either the existing symbol or the
642 new symbol is weak, or if the old symbol is undefined. */
645 || h->root.type == bfd_link_hash_undefined)
646 *size_change_ok = true;
648 /* If both the old and the new symbols look like common symbols in a
649 dynamic object, set the size of the symbol to the larger of the
654 && sym->st_size != h->size)
656 /* Since we think we have two common symbols, issue a multiple
657 common warning if desired. Note that we only warn if the
658 size is different. If the size is the same, we simply let
659 the old symbol override the new one as normally happens with
660 symbols defined in dynamic objects. */
662 if (! ((*info->callbacks->multiple_common)
663 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
664 h->size, abfd, bfd_link_hash_common, sym->st_size)))
667 if (sym->st_size > h->size)
668 h->size = sym->st_size;
670 *size_change_ok = true;
673 /* If we are looking at a dynamic object, and we have found a
674 definition, we need to see if the symbol was already defined by
675 some other object. If so, we want to use the existing
676 definition, and we do not want to report a multiple symbol
677 definition error; we do this by clobbering *PSEC to be
680 We treat a common symbol as a definition if the symbol in the
681 shared library is a function, since common symbols always
682 represent variables; this can cause confusion in principle, but
683 any such confusion would seem to indicate an erroneous program or
684 shared library. We also permit a common symbol in a regular
685 object to override a weak symbol in a shared object.
687 We prefer a non-weak definition in a shared library to a weak
688 definition in the executable unless it comes from a DT_NEEDED
689 entry of a shared object, in which case, the DT_NEEDED entry
690 may not be required at the run time. */
695 || (h->root.type == bfd_link_hash_common
697 || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))
698 && (h->root.type != bfd_link_hash_defweak
700 || bind == STB_WEAK))
704 newdyncommon = false;
706 *psec = sec = bfd_und_section_ptr;
707 *size_change_ok = true;
709 /* If we get here when the old symbol is a common symbol, then
710 we are explicitly letting it override a weak symbol or
711 function in a dynamic object, and we don't want to warn about
712 a type change. If the old symbol is a defined symbol, a type
713 change warning may still be appropriate. */
715 if (h->root.type == bfd_link_hash_common)
716 *type_change_ok = true;
719 /* Handle the special case of an old common symbol merging with a
720 new symbol which looks like a common symbol in a shared object.
721 We change *PSEC and *PVALUE to make the new symbol look like a
722 common symbol, and let _bfd_generic_link_add_one_symbol will do
726 && h->root.type == bfd_link_hash_common)
730 newdyncommon = false;
731 *pvalue = sym->st_size;
732 *psec = sec = bfd_com_section_ptr;
733 *size_change_ok = true;
736 /* If the old symbol is from a dynamic object, and the new symbol is
737 a definition which is not from a dynamic object, then the new
738 symbol overrides the old symbol. Symbols from regular files
739 always take precedence over symbols from dynamic objects, even if
740 they are defined after the dynamic object in the link.
742 As above, we again permit a common symbol in a regular object to
743 override a definition in a shared object if the shared object
744 symbol is a function or is weak.
746 As above, we permit a non-weak definition in a shared object to
747 override a weak definition in a regular object. */
751 || (bfd_is_com_section (sec)
752 && (h->root.type == bfd_link_hash_defweak
753 || h->type == STT_FUNC)))
756 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
758 || h->root.type == bfd_link_hash_defweak))
760 /* Change the hash table entry to undefined, and let
761 _bfd_generic_link_add_one_symbol do the right thing with the
764 h->root.type = bfd_link_hash_undefined;
765 h->root.u.undef.abfd = h->root.u.def.section->owner;
766 *size_change_ok = true;
769 olddyncommon = false;
771 /* We again permit a type change when a common symbol may be
772 overriding a function. */
774 if (bfd_is_com_section (sec))
775 *type_change_ok = true;
777 /* This union may have been set to be non-NULL when this symbol
778 was seen in a dynamic object. We must force the union to be
779 NULL, so that it is correct for a regular symbol. */
781 h->verinfo.vertree = NULL;
783 /* In this special case, if H is the target of an indirection,
784 we want the caller to frob with H rather than with the
785 indirect symbol. That will permit the caller to redefine the
786 target of the indirection, rather than the indirect symbol
787 itself. FIXME: This will break the -y option if we store a
788 symbol with a different name. */
792 /* Handle the special case of a new common symbol merging with an
793 old symbol that looks like it might be a common symbol defined in
794 a shared object. Note that we have already handled the case in
795 which a new common symbol should simply override the definition
796 in the shared library. */
799 && bfd_is_com_section (sec)
802 /* It would be best if we could set the hash table entry to a
803 common symbol, but we don't know what to use for the section
805 if (! ((*info->callbacks->multiple_common)
806 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
807 h->size, abfd, bfd_link_hash_common, sym->st_size)))
810 /* If the predumed common symbol in the dynamic object is
811 larger, pretend that the new symbol has its size. */
813 if (h->size > *pvalue)
816 /* FIXME: We no longer know the alignment required by the symbol
817 in the dynamic object, so we just wind up using the one from
818 the regular object. */
821 olddyncommon = false;
823 h->root.type = bfd_link_hash_undefined;
824 h->root.u.undef.abfd = h->root.u.def.section->owner;
826 *size_change_ok = true;
827 *type_change_ok = true;
829 h->verinfo.vertree = NULL;
832 /* Handle the special case of a weak definition in a regular object
833 followed by a non-weak definition in a shared object. In this
834 case, we prefer the definition in the shared object unless it
835 comes from a DT_NEEDED entry of a shared object, in which case,
836 the DT_NEEDED entry may not be required at the run time. */
839 && h->root.type == bfd_link_hash_defweak
844 /* To make this work we have to frob the flags so that the rest
845 of the code does not think we are using the regular
847 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
848 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
849 else if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)
850 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
851 h->elf_link_hash_flags &= ~ (ELF_LINK_HASH_DEF_REGULAR
852 | ELF_LINK_HASH_DEF_DYNAMIC);
854 /* If H is the target of an indirection, we want the caller to
855 use H rather than the indirect symbol. Otherwise if we are
856 defining a new indirect symbol we will wind up attaching it
857 to the entry we are overriding. */
861 /* Handle the special case of a non-weak definition in a shared
862 object followed by a weak definition in a regular object. In
863 this case we prefer to definition in the shared object. To make
864 this work we have to tell the caller to not treat the new symbol
868 && h->root.type != bfd_link_hash_defweak
877 /* Add symbols from an ELF object file to the linker hash table. */
880 elf_link_add_object_symbols (abfd, info)
882 struct bfd_link_info *info;
884 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
885 const Elf_Internal_Sym *,
886 const char **, flagword *,
887 asection **, bfd_vma *));
888 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
889 asection *, const Elf_Internal_Rela *));
891 Elf_Internal_Shdr *hdr;
895 Elf_External_Sym *buf = NULL;
896 struct elf_link_hash_entry **sym_hash;
898 Elf_External_Versym *extversym = NULL;
899 Elf_External_Versym *ever;
900 Elf_External_Dyn *dynbuf = NULL;
901 struct elf_link_hash_entry *weaks;
902 Elf_External_Sym *esym;
903 Elf_External_Sym *esymend;
904 struct elf_backend_data *bed;
907 bed = get_elf_backend_data (abfd);
908 add_symbol_hook = bed->elf_add_symbol_hook;
909 collect = bed->collect;
911 if ((abfd->flags & DYNAMIC) == 0)
917 /* You can't use -r against a dynamic object. Also, there's no
918 hope of using a dynamic object which does not exactly match
919 the format of the output file. */
920 if (info->relocateable || info->hash->creator != abfd->xvec)
922 bfd_set_error (bfd_error_invalid_operation);
927 /* As a GNU extension, any input sections which are named
928 .gnu.warning.SYMBOL are treated as warning symbols for the given
929 symbol. This differs from .gnu.warning sections, which generate
930 warnings when they are included in an output file. */
935 for (s = abfd->sections; s != NULL; s = s->next)
939 name = bfd_get_section_name (abfd, s);
940 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
945 name += sizeof ".gnu.warning." - 1;
947 /* If this is a shared object, then look up the symbol
948 in the hash table. If it is there, and it is already
949 been defined, then we will not be using the entry
950 from this shared object, so we don't need to warn.
951 FIXME: If we see the definition in a regular object
952 later on, we will warn, but we shouldn't. The only
953 fix is to keep track of what warnings we are supposed
954 to emit, and then handle them all at the end of the
956 if (dynamic && abfd->xvec == info->hash->creator)
958 struct elf_link_hash_entry *h;
960 h = elf_link_hash_lookup (elf_hash_table (info), name,
963 /* FIXME: What about bfd_link_hash_common? */
965 && (h->root.type == bfd_link_hash_defined
966 || h->root.type == bfd_link_hash_defweak))
968 /* We don't want to issue this warning. Clobber
969 the section size so that the warning does not
970 get copied into the output file. */
976 sz = bfd_section_size (abfd, s);
977 msg = (char *) bfd_alloc (abfd, sz + 1);
981 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
986 if (! (_bfd_generic_link_add_one_symbol
987 (info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg,
988 false, collect, (struct bfd_link_hash_entry **) NULL)))
991 if (! info->relocateable)
993 /* Clobber the section size so that the warning does
994 not get copied into the output file. */
1001 /* If this is a dynamic object, we always link against the .dynsym
1002 symbol table, not the .symtab symbol table. The dynamic linker
1003 will only see the .dynsym symbol table, so there is no reason to
1004 look at .symtab for a dynamic object. */
1006 if (! dynamic || elf_dynsymtab (abfd) == 0)
1007 hdr = &elf_tdata (abfd)->symtab_hdr;
1009 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
1013 /* Read in any version definitions. */
1015 if (! _bfd_elf_slurp_version_tables (abfd))
1018 /* Read in the symbol versions, but don't bother to convert them
1019 to internal format. */
1020 if (elf_dynversym (abfd) != 0)
1022 Elf_Internal_Shdr *versymhdr;
1024 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
1025 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
1026 if (extversym == NULL)
1028 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
1029 || (bfd_read ((PTR) extversym, 1, versymhdr->sh_size, abfd)
1030 != versymhdr->sh_size))
1035 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1037 /* The sh_info field of the symtab header tells us where the
1038 external symbols start. We don't care about the local symbols at
1040 if (elf_bad_symtab (abfd))
1042 extsymcount = symcount;
1047 extsymcount = symcount - hdr->sh_info;
1048 extsymoff = hdr->sh_info;
1051 buf = ((Elf_External_Sym *)
1052 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
1053 if (buf == NULL && extsymcount != 0)
1056 /* We store a pointer to the hash table entry for each external
1058 sym_hash = ((struct elf_link_hash_entry **)
1060 extsymcount * sizeof (struct elf_link_hash_entry *)));
1061 if (sym_hash == NULL)
1063 elf_sym_hashes (abfd) = sym_hash;
1069 /* If we are creating a shared library, create all the dynamic
1070 sections immediately. We need to attach them to something,
1071 so we attach them to this BFD, provided it is the right
1072 format. FIXME: If there are no input BFD's of the same
1073 format as the output, we can't make a shared library. */
1075 && ! elf_hash_table (info)->dynamic_sections_created
1076 && abfd->xvec == info->hash->creator)
1078 if (! elf_link_create_dynamic_sections (abfd, info))
1087 bfd_size_type oldsize;
1088 bfd_size_type strindex;
1090 /* Find the name to use in a DT_NEEDED entry that refers to this
1091 object. If the object has a DT_SONAME entry, we use it.
1092 Otherwise, if the generic linker stuck something in
1093 elf_dt_name, we use that. Otherwise, we just use the file
1094 name. If the generic linker put a null string into
1095 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1096 there is a DT_SONAME entry. */
1098 name = bfd_get_filename (abfd);
1099 if (elf_dt_name (abfd) != NULL)
1101 name = elf_dt_name (abfd);
1104 if (elf_dt_soname (abfd) != NULL)
1110 s = bfd_get_section_by_name (abfd, ".dynamic");
1113 Elf_External_Dyn *extdyn;
1114 Elf_External_Dyn *extdynend;
1120 dynbuf = (Elf_External_Dyn *) bfd_malloc ((size_t) s->_raw_size);
1124 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
1125 (file_ptr) 0, s->_raw_size))
1128 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1131 link = elf_elfsections (abfd)[elfsec]->sh_link;
1134 /* The shared libraries distributed with hpux11 have a bogus
1135 sh_link field for the ".dynamic" section. This code detects
1136 when LINK refers to a section that is not a string table and
1137 tries to find the string table for the ".dynsym" section
1139 Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[link];
1140 if (hdr->sh_type != SHT_STRTAB)
1142 asection *s = bfd_get_section_by_name (abfd, ".dynsym");
1143 int elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1146 link = elf_elfsections (abfd)[elfsec]->sh_link;
1151 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
1154 for (; extdyn < extdynend; extdyn++)
1156 Elf_Internal_Dyn dyn;
1158 elf_swap_dyn_in (abfd, extdyn, &dyn);
1159 if (dyn.d_tag == DT_SONAME)
1161 name = bfd_elf_string_from_elf_section (abfd, link,
1166 if (dyn.d_tag == DT_NEEDED)
1168 struct bfd_link_needed_list *n, **pn;
1171 n = ((struct bfd_link_needed_list *)
1172 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1173 fnm = bfd_elf_string_from_elf_section (abfd, link,
1175 if (n == NULL || fnm == NULL)
1177 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1184 for (pn = &elf_hash_table (info)->needed;
1190 if (dyn.d_tag == DT_RUNPATH)
1192 struct bfd_link_needed_list *n, **pn;
1195 /* When we see DT_RPATH before DT_RUNPATH, we have
1196 to clear runpath. Do _NOT_ bfd_release, as that
1197 frees all more recently bfd_alloc'd blocks as
1199 if (rpath && elf_hash_table (info)->runpath)
1200 elf_hash_table (info)->runpath = NULL;
1202 n = ((struct bfd_link_needed_list *)
1203 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1204 fnm = bfd_elf_string_from_elf_section (abfd, link,
1206 if (n == NULL || fnm == NULL)
1208 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1215 for (pn = &elf_hash_table (info)->runpath;
1223 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1224 if (!runpath && dyn.d_tag == DT_RPATH)
1226 struct bfd_link_needed_list *n, **pn;
1229 n = ((struct bfd_link_needed_list *)
1230 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1231 fnm = bfd_elf_string_from_elf_section (abfd, link,
1233 if (n == NULL || fnm == NULL)
1235 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1242 for (pn = &elf_hash_table (info)->runpath;
1255 /* We do not want to include any of the sections in a dynamic
1256 object in the output file. We hack by simply clobbering the
1257 list of sections in the BFD. This could be handled more
1258 cleanly by, say, a new section flag; the existing
1259 SEC_NEVER_LOAD flag is not the one we want, because that one
1260 still implies that the section takes up space in the output
1262 abfd->sections = NULL;
1263 abfd->section_count = 0;
1265 /* If this is the first dynamic object found in the link, create
1266 the special sections required for dynamic linking. */
1267 if (! elf_hash_table (info)->dynamic_sections_created)
1269 if (! elf_link_create_dynamic_sections (abfd, info))
1275 /* Add a DT_NEEDED entry for this dynamic object. */
1276 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1277 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr, name,
1279 if (strindex == (bfd_size_type) -1)
1282 if (oldsize == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
1285 Elf_External_Dyn *dyncon, *dynconend;
1287 /* The hash table size did not change, which means that
1288 the dynamic object name was already entered. If we
1289 have already included this dynamic object in the
1290 link, just ignore it. There is no reason to include
1291 a particular dynamic object more than once. */
1292 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
1294 BFD_ASSERT (sdyn != NULL);
1296 dyncon = (Elf_External_Dyn *) sdyn->contents;
1297 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1299 for (; dyncon < dynconend; dyncon++)
1301 Elf_Internal_Dyn dyn;
1303 elf_swap_dyn_in (elf_hash_table (info)->dynobj, dyncon,
1305 if (dyn.d_tag == DT_NEEDED
1306 && dyn.d_un.d_val == strindex)
1310 if (extversym != NULL)
1317 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
1321 /* Save the SONAME, if there is one, because sometimes the
1322 linker emulation code will need to know it. */
1324 name = basename (bfd_get_filename (abfd));
1325 elf_dt_name (abfd) = name;
1329 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
1331 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
1332 != extsymcount * sizeof (Elf_External_Sym)))
1337 ever = extversym != NULL ? extversym + extsymoff : NULL;
1338 esymend = buf + extsymcount;
1341 esym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
1343 Elf_Internal_Sym sym;
1349 struct elf_link_hash_entry *h;
1351 boolean size_change_ok, type_change_ok;
1352 boolean new_weakdef;
1353 unsigned int old_alignment;
1355 elf_swap_symbol_in (abfd, esym, &sym);
1357 flags = BSF_NO_FLAGS;
1359 value = sym.st_value;
1362 bind = ELF_ST_BIND (sym.st_info);
1363 if (bind == STB_LOCAL)
1365 /* This should be impossible, since ELF requires that all
1366 global symbols follow all local symbols, and that sh_info
1367 point to the first global symbol. Unfortunatealy, Irix 5
1371 else if (bind == STB_GLOBAL)
1373 if (sym.st_shndx != SHN_UNDEF
1374 && sym.st_shndx != SHN_COMMON)
1377 else if (bind == STB_WEAK)
1381 /* Leave it up to the processor backend. */
1384 if (sym.st_shndx == SHN_UNDEF)
1385 sec = bfd_und_section_ptr;
1386 else if (sym.st_shndx > 0 && sym.st_shndx < SHN_LORESERVE)
1388 sec = section_from_elf_index (abfd, sym.st_shndx);
1390 sec = bfd_abs_section_ptr;
1391 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
1394 else if (sym.st_shndx == SHN_ABS)
1395 sec = bfd_abs_section_ptr;
1396 else if (sym.st_shndx == SHN_COMMON)
1398 sec = bfd_com_section_ptr;
1399 /* What ELF calls the size we call the value. What ELF
1400 calls the value we call the alignment. */
1401 value = sym.st_size;
1405 /* Leave it up to the processor backend. */
1408 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
1409 if (name == (const char *) NULL)
1412 if (add_symbol_hook)
1414 if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
1418 /* The hook function sets the name to NULL if this symbol
1419 should be skipped for some reason. */
1420 if (name == (const char *) NULL)
1424 /* Sanity check that all possibilities were handled. */
1425 if (sec == (asection *) NULL)
1427 bfd_set_error (bfd_error_bad_value);
1431 if (bfd_is_und_section (sec)
1432 || bfd_is_com_section (sec))
1437 size_change_ok = false;
1438 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
1440 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1442 Elf_Internal_Versym iver;
1443 unsigned int vernum = 0;
1448 _bfd_elf_swap_versym_in (abfd, ever, &iver);
1449 vernum = iver.vs_vers & VERSYM_VERSION;
1451 /* If this is a hidden symbol, or if it is not version
1452 1, we append the version name to the symbol name.
1453 However, we do not modify a non-hidden absolute
1454 symbol, because it might be the version symbol
1455 itself. FIXME: What if it isn't? */
1456 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
1457 || (vernum > 1 && ! bfd_is_abs_section (sec)))
1460 int namelen, newlen;
1463 if (sym.st_shndx != SHN_UNDEF)
1465 if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
1467 (*_bfd_error_handler)
1468 (_("%s: %s: invalid version %u (max %d)"),
1469 bfd_get_filename (abfd), name, vernum,
1470 elf_tdata (abfd)->dynverdef_hdr.sh_info);
1471 bfd_set_error (bfd_error_bad_value);
1474 else if (vernum > 1)
1476 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
1482 /* We cannot simply test for the number of
1483 entries in the VERNEED section since the
1484 numbers for the needed versions do not start
1486 Elf_Internal_Verneed *t;
1489 for (t = elf_tdata (abfd)->verref;
1493 Elf_Internal_Vernaux *a;
1495 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1497 if (a->vna_other == vernum)
1499 verstr = a->vna_nodename;
1508 (*_bfd_error_handler)
1509 (_("%s: %s: invalid needed version %d"),
1510 bfd_get_filename (abfd), name, vernum);
1511 bfd_set_error (bfd_error_bad_value);
1516 namelen = strlen (name);
1517 newlen = namelen + strlen (verstr) + 2;
1518 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
1521 newname = (char *) bfd_alloc (abfd, newlen);
1522 if (newname == NULL)
1524 strcpy (newname, name);
1525 p = newname + namelen;
1527 /* If this is a defined non-hidden version symbol,
1528 we add another @ to the name. This indicates the
1529 default version of the symbol. */
1530 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
1531 && sym.st_shndx != SHN_UNDEF)
1539 if (! elf_merge_symbol (abfd, info, name, &sym, &sec, &value,
1540 sym_hash, &override, &type_change_ok,
1541 &size_change_ok, dt_needed))
1548 while (h->root.type == bfd_link_hash_indirect
1549 || h->root.type == bfd_link_hash_warning)
1550 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1552 /* Remember the old alignment if this is a common symbol, so
1553 that we don't reduce the alignment later on. We can't
1554 check later, because _bfd_generic_link_add_one_symbol
1555 will set a default for the alignment which we want to
1557 if (h->root.type == bfd_link_hash_common)
1558 old_alignment = h->root.u.c.p->alignment_power;
1560 if (elf_tdata (abfd)->verdef != NULL
1564 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
1567 if (! (_bfd_generic_link_add_one_symbol
1568 (info, abfd, name, flags, sec, value, (const char *) NULL,
1569 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
1573 while (h->root.type == bfd_link_hash_indirect
1574 || h->root.type == bfd_link_hash_warning)
1575 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1578 new_weakdef = false;
1581 && (flags & BSF_WEAK) != 0
1582 && ELF_ST_TYPE (sym.st_info) != STT_FUNC
1583 && info->hash->creator->flavour == bfd_target_elf_flavour
1584 && h->weakdef == NULL)
1586 /* Keep a list of all weak defined non function symbols from
1587 a dynamic object, using the weakdef field. Later in this
1588 function we will set the weakdef field to the correct
1589 value. We only put non-function symbols from dynamic
1590 objects on this list, because that happens to be the only
1591 time we need to know the normal symbol corresponding to a
1592 weak symbol, and the information is time consuming to
1593 figure out. If the weakdef field is not already NULL,
1594 then this symbol was already defined by some previous
1595 dynamic object, and we will be using that previous
1596 definition anyhow. */
1603 /* Set the alignment of a common symbol. */
1604 if (sym.st_shndx == SHN_COMMON
1605 && h->root.type == bfd_link_hash_common)
1609 align = bfd_log2 (sym.st_value);
1610 if (align > old_alignment
1611 /* Permit an alignment power of zero if an alignment of one
1612 is specified and no other alignments have been specified. */
1613 || (sym.st_value == 1 && old_alignment == 0))
1614 h->root.u.c.p->alignment_power = align;
1617 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1623 /* Remember the symbol size and type. */
1624 if (sym.st_size != 0
1625 && (definition || h->size == 0))
1627 if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
1628 (*_bfd_error_handler)
1629 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1630 name, (unsigned long) h->size, (unsigned long) sym.st_size,
1631 bfd_get_filename (abfd));
1633 h->size = sym.st_size;
1636 /* If this is a common symbol, then we always want H->SIZE
1637 to be the size of the common symbol. The code just above
1638 won't fix the size if a common symbol becomes larger. We
1639 don't warn about a size change here, because that is
1640 covered by --warn-common. */
1641 if (h->root.type == bfd_link_hash_common)
1642 h->size = h->root.u.c.size;
1644 if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
1645 && (definition || h->type == STT_NOTYPE))
1647 if (h->type != STT_NOTYPE
1648 && h->type != ELF_ST_TYPE (sym.st_info)
1649 && ! type_change_ok)
1650 (*_bfd_error_handler)
1651 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1652 name, h->type, ELF_ST_TYPE (sym.st_info),
1653 bfd_get_filename (abfd));
1655 h->type = ELF_ST_TYPE (sym.st_info);
1658 /* If st_other has a processor-specific meaning, specific code
1659 might be needed here. */
1660 if (sym.st_other != 0)
1662 /* Combine visibilities, using the most constraining one. */
1663 unsigned char hvis = ELF_ST_VISIBILITY (h->other);
1664 unsigned char symvis = ELF_ST_VISIBILITY (sym.st_other);
1666 if (symvis && (hvis > symvis || hvis == 0))
1667 h->other = sym.st_other;
1669 /* If neither has visibility, use the st_other of the
1670 definition. This is an arbitrary choice, since the
1671 other bits have no general meaning. */
1672 if (!symvis && !hvis
1673 && (definition || h->other == 0))
1674 h->other = sym.st_other;
1677 /* Set a flag in the hash table entry indicating the type of
1678 reference or definition we just found. Keep a count of
1679 the number of dynamic symbols we find. A dynamic symbol
1680 is one which is referenced or defined by both a regular
1681 object and a shared object. */
1682 old_flags = h->elf_link_hash_flags;
1688 new_flag = ELF_LINK_HASH_REF_REGULAR;
1689 if (bind != STB_WEAK)
1690 new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK;
1693 new_flag = ELF_LINK_HASH_DEF_REGULAR;
1695 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
1696 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
1702 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
1704 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
1705 if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
1706 | ELF_LINK_HASH_REF_REGULAR)) != 0
1707 || (h->weakdef != NULL
1709 && h->weakdef->dynindx != -1))
1713 h->elf_link_hash_flags |= new_flag;
1715 /* If this symbol has a version, and it is the default
1716 version, we create an indirect symbol from the default
1717 name to the fully decorated name. This will cause
1718 external references which do not specify a version to be
1719 bound to this version of the symbol. */
1720 if (definition || h->root.type == bfd_link_hash_common)
1724 p = strchr (name, ELF_VER_CHR);
1725 if (p != NULL && p[1] == ELF_VER_CHR)
1728 struct elf_link_hash_entry *hi;
1731 shortname = bfd_hash_allocate (&info->hash->table,
1733 if (shortname == NULL)
1735 strncpy (shortname, name, p - name);
1736 shortname[p - name] = '\0';
1738 /* We are going to create a new symbol. Merge it
1739 with any existing symbol with this name. For the
1740 purposes of the merge, act as though we were
1741 defining the symbol we just defined, although we
1742 actually going to define an indirect symbol. */
1743 type_change_ok = false;
1744 size_change_ok = false;
1745 if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
1746 &value, &hi, &override,
1748 &size_change_ok, dt_needed))
1753 if (! (_bfd_generic_link_add_one_symbol
1754 (info, abfd, shortname, BSF_INDIRECT,
1755 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1756 collect, (struct bfd_link_hash_entry **) &hi)))
1761 /* In this case the symbol named SHORTNAME is
1762 overriding the indirect symbol we want to
1763 add. We were planning on making SHORTNAME an
1764 indirect symbol referring to NAME. SHORTNAME
1765 is the name without a version. NAME is the
1766 fully versioned name, and it is the default
1769 Overriding means that we already saw a
1770 definition for the symbol SHORTNAME in a
1771 regular object, and it is overriding the
1772 symbol defined in the dynamic object.
1774 When this happens, we actually want to change
1775 NAME, the symbol we just added, to refer to
1776 SHORTNAME. This will cause references to
1777 NAME in the shared object to become
1778 references to SHORTNAME in the regular
1779 object. This is what we expect when we
1780 override a function in a shared object: that
1781 the references in the shared object will be
1782 mapped to the definition in the regular
1785 while (hi->root.type == bfd_link_hash_indirect
1786 || hi->root.type == bfd_link_hash_warning)
1787 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1789 h->root.type = bfd_link_hash_indirect;
1790 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1791 if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC)
1793 h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC;
1794 hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
1795 if (hi->elf_link_hash_flags
1796 & (ELF_LINK_HASH_REF_REGULAR
1797 | ELF_LINK_HASH_DEF_REGULAR))
1799 if (! _bfd_elf_link_record_dynamic_symbol (info,
1805 /* Now set HI to H, so that the following code
1806 will set the other fields correctly. */
1810 /* If there is a duplicate definition somewhere,
1811 then HI may not point to an indirect symbol. We
1812 will have reported an error to the user in that
1815 if (hi->root.type == bfd_link_hash_indirect)
1817 struct elf_link_hash_entry *ht;
1819 /* If the symbol became indirect, then we assume
1820 that we have not seen a definition before. */
1821 BFD_ASSERT ((hi->elf_link_hash_flags
1822 & (ELF_LINK_HASH_DEF_DYNAMIC
1823 | ELF_LINK_HASH_DEF_REGULAR))
1826 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1827 (*bed->elf_backend_copy_indirect_symbol) (ht, hi);
1829 /* See if the new flags lead us to realize that
1830 the symbol must be dynamic. */
1836 || ((hi->elf_link_hash_flags
1837 & ELF_LINK_HASH_REF_DYNAMIC)
1843 if ((hi->elf_link_hash_flags
1844 & ELF_LINK_HASH_REF_REGULAR) != 0)
1850 /* We also need to define an indirection from the
1851 nondefault version of the symbol. */
1853 shortname = bfd_hash_allocate (&info->hash->table,
1855 if (shortname == NULL)
1857 strncpy (shortname, name, p - name);
1858 strcpy (shortname + (p - name), p + 1);
1860 /* Once again, merge with any existing symbol. */
1861 type_change_ok = false;
1862 size_change_ok = false;
1863 if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
1864 &value, &hi, &override,
1866 &size_change_ok, dt_needed))
1871 /* Here SHORTNAME is a versioned name, so we
1872 don't expect to see the type of override we
1873 do in the case above. */
1874 (*_bfd_error_handler)
1875 (_("%s: warning: unexpected redefinition of `%s'"),
1876 bfd_get_filename (abfd), shortname);
1880 if (! (_bfd_generic_link_add_one_symbol
1881 (info, abfd, shortname, BSF_INDIRECT,
1882 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1883 collect, (struct bfd_link_hash_entry **) &hi)))
1886 /* If there is a duplicate definition somewhere,
1887 then HI may not point to an indirect symbol.
1888 We will have reported an error to the user in
1891 if (hi->root.type == bfd_link_hash_indirect)
1893 /* If the symbol became indirect, then we
1894 assume that we have not seen a definition
1896 BFD_ASSERT ((hi->elf_link_hash_flags
1897 & (ELF_LINK_HASH_DEF_DYNAMIC
1898 | ELF_LINK_HASH_DEF_REGULAR))
1901 (*bed->elf_backend_copy_indirect_symbol) (h, hi);
1903 /* See if the new flags lead us to realize
1904 that the symbol must be dynamic. */
1910 || ((hi->elf_link_hash_flags
1911 & ELF_LINK_HASH_REF_DYNAMIC)
1917 if ((hi->elf_link_hash_flags
1918 & ELF_LINK_HASH_REF_REGULAR) != 0)
1927 if (dynsym && h->dynindx == -1)
1929 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
1931 if (h->weakdef != NULL
1933 && h->weakdef->dynindx == -1)
1935 if (! _bfd_elf_link_record_dynamic_symbol (info,
1940 else if (dynsym && h->dynindx != -1)
1941 /* If the symbol already has a dynamic index, but
1942 visibility says it should not be visible, turn it into
1944 switch (ELF_ST_VISIBILITY (h->other))
1948 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
1949 (*bed->elf_backend_hide_symbol) (info, h);
1953 if (dt_needed && definition
1954 && (h->elf_link_hash_flags
1955 & ELF_LINK_HASH_REF_REGULAR) != 0)
1957 bfd_size_type oldsize;
1958 bfd_size_type strindex;
1960 /* The symbol from a DT_NEEDED object is referenced from
1961 the regular object to create a dynamic executable. We
1962 have to make sure there is a DT_NEEDED entry for it. */
1965 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1966 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
1967 elf_dt_soname (abfd),
1969 if (strindex == (bfd_size_type) -1)
1973 == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
1976 Elf_External_Dyn *dyncon, *dynconend;
1978 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
1980 BFD_ASSERT (sdyn != NULL);
1982 dyncon = (Elf_External_Dyn *) sdyn->contents;
1983 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1985 for (; dyncon < dynconend; dyncon++)
1987 Elf_Internal_Dyn dyn;
1989 elf_swap_dyn_in (elf_hash_table (info)->dynobj,
1991 BFD_ASSERT (dyn.d_tag != DT_NEEDED ||
1992 dyn.d_un.d_val != strindex);
1996 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
2002 /* Now set the weakdefs field correctly for all the weak defined
2003 symbols we found. The only way to do this is to search all the
2004 symbols. Since we only need the information for non functions in
2005 dynamic objects, that's the only time we actually put anything on
2006 the list WEAKS. We need this information so that if a regular
2007 object refers to a symbol defined weakly in a dynamic object, the
2008 real symbol in the dynamic object is also put in the dynamic
2009 symbols; we also must arrange for both symbols to point to the
2010 same memory location. We could handle the general case of symbol
2011 aliasing, but a general symbol alias can only be generated in
2012 assembler code, handling it correctly would be very time
2013 consuming, and other ELF linkers don't handle general aliasing
2015 while (weaks != NULL)
2017 struct elf_link_hash_entry *hlook;
2020 struct elf_link_hash_entry **hpp;
2021 struct elf_link_hash_entry **hppend;
2024 weaks = hlook->weakdef;
2025 hlook->weakdef = NULL;
2027 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
2028 || hlook->root.type == bfd_link_hash_defweak
2029 || hlook->root.type == bfd_link_hash_common
2030 || hlook->root.type == bfd_link_hash_indirect);
2031 slook = hlook->root.u.def.section;
2032 vlook = hlook->root.u.def.value;
2034 hpp = elf_sym_hashes (abfd);
2035 hppend = hpp + extsymcount;
2036 for (; hpp < hppend; hpp++)
2038 struct elf_link_hash_entry *h;
2041 if (h != NULL && h != hlook
2042 && h->root.type == bfd_link_hash_defined
2043 && h->root.u.def.section == slook
2044 && h->root.u.def.value == vlook)
2048 /* If the weak definition is in the list of dynamic
2049 symbols, make sure the real definition is put there
2051 if (hlook->dynindx != -1
2052 && h->dynindx == -1)
2054 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2058 /* If the real definition is in the list of dynamic
2059 symbols, make sure the weak definition is put there
2060 as well. If we don't do this, then the dynamic
2061 loader might not merge the entries for the real
2062 definition and the weak definition. */
2063 if (h->dynindx != -1
2064 && hlook->dynindx == -1)
2066 if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
2081 if (extversym != NULL)
2087 /* If this object is the same format as the output object, and it is
2088 not a shared library, then let the backend look through the
2091 This is required to build global offset table entries and to
2092 arrange for dynamic relocs. It is not required for the
2093 particular common case of linking non PIC code, even when linking
2094 against shared libraries, but unfortunately there is no way of
2095 knowing whether an object file has been compiled PIC or not.
2096 Looking through the relocs is not particularly time consuming.
2097 The problem is that we must either (1) keep the relocs in memory,
2098 which causes the linker to require additional runtime memory or
2099 (2) read the relocs twice from the input file, which wastes time.
2100 This would be a good case for using mmap.
2102 I have no idea how to handle linking PIC code into a file of a
2103 different format. It probably can't be done. */
2104 check_relocs = get_elf_backend_data (abfd)->check_relocs;
2106 && abfd->xvec == info->hash->creator
2107 && check_relocs != NULL)
2111 for (o = abfd->sections; o != NULL; o = o->next)
2113 Elf_Internal_Rela *internal_relocs;
2116 if ((o->flags & SEC_RELOC) == 0
2117 || o->reloc_count == 0
2118 || ((info->strip == strip_all || info->strip == strip_debugger)
2119 && (o->flags & SEC_DEBUGGING) != 0)
2120 || bfd_is_abs_section (o->output_section))
2123 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2124 (abfd, o, (PTR) NULL,
2125 (Elf_Internal_Rela *) NULL,
2126 info->keep_memory));
2127 if (internal_relocs == NULL)
2130 ok = (*check_relocs) (abfd, info, o, internal_relocs);
2132 if (! info->keep_memory)
2133 free (internal_relocs);
2140 /* If this is a non-traditional, non-relocateable link, try to
2141 optimize the handling of the .stab/.stabstr sections. */
2143 && ! info->relocateable
2144 && ! info->traditional_format
2145 && info->hash->creator->flavour == bfd_target_elf_flavour
2146 && (info->strip != strip_all && info->strip != strip_debugger))
2148 asection *stab, *stabstr;
2150 stab = bfd_get_section_by_name (abfd, ".stab");
2153 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
2155 if (stabstr != NULL)
2157 struct bfd_elf_section_data *secdata;
2159 secdata = elf_section_data (stab);
2160 if (! _bfd_link_section_stabs (abfd,
2161 &elf_hash_table (info)->stab_info,
2163 &secdata->stab_info))
2169 if (! info->relocateable && ! dynamic)
2173 for (s = abfd->sections; s != NULL; s = s->next)
2174 if ((s->flags & SEC_MERGE)
2175 && ! _bfd_merge_section (abfd,
2176 &elf_hash_table (info)->merge_info,
2177 s, &elf_section_data (s)->merge_info))
2188 if (extversym != NULL)
2193 /* Create some sections which will be filled in with dynamic linking
2194 information. ABFD is an input file which requires dynamic sections
2195 to be created. The dynamic sections take up virtual memory space
2196 when the final executable is run, so we need to create them before
2197 addresses are assigned to the output sections. We work out the
2198 actual contents and size of these sections later. */
2201 elf_link_create_dynamic_sections (abfd, info)
2203 struct bfd_link_info *info;
2206 register asection *s;
2207 struct elf_link_hash_entry *h;
2208 struct elf_backend_data *bed;
2210 if (elf_hash_table (info)->dynamic_sections_created)
2213 /* Make sure that all dynamic sections use the same input BFD. */
2214 if (elf_hash_table (info)->dynobj == NULL)
2215 elf_hash_table (info)->dynobj = abfd;
2217 abfd = elf_hash_table (info)->dynobj;
2219 /* Note that we set the SEC_IN_MEMORY flag for all of these
2221 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
2222 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2224 /* A dynamically linked executable has a .interp section, but a
2225 shared library does not. */
2228 s = bfd_make_section (abfd, ".interp");
2230 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2234 /* Create sections to hold version informations. These are removed
2235 if they are not needed. */
2236 s = bfd_make_section (abfd, ".gnu.version_d");
2238 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2239 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2242 s = bfd_make_section (abfd, ".gnu.version");
2244 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2245 || ! bfd_set_section_alignment (abfd, s, 1))
2248 s = bfd_make_section (abfd, ".gnu.version_r");
2250 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2251 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2254 s = bfd_make_section (abfd, ".dynsym");
2256 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2257 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2260 s = bfd_make_section (abfd, ".dynstr");
2262 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2265 /* Create a strtab to hold the dynamic symbol names. */
2266 if (elf_hash_table (info)->dynstr == NULL)
2268 elf_hash_table (info)->dynstr = elf_stringtab_init ();
2269 if (elf_hash_table (info)->dynstr == NULL)
2273 s = bfd_make_section (abfd, ".dynamic");
2275 || ! bfd_set_section_flags (abfd, s, flags)
2276 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2279 /* The special symbol _DYNAMIC is always set to the start of the
2280 .dynamic section. This call occurs before we have processed the
2281 symbols for any dynamic object, so we don't have to worry about
2282 overriding a dynamic definition. We could set _DYNAMIC in a
2283 linker script, but we only want to define it if we are, in fact,
2284 creating a .dynamic section. We don't want to define it if there
2285 is no .dynamic section, since on some ELF platforms the start up
2286 code examines it to decide how to initialize the process. */
2288 if (! (_bfd_generic_link_add_one_symbol
2289 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
2290 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
2291 (struct bfd_link_hash_entry **) &h)))
2293 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2294 h->type = STT_OBJECT;
2297 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
2300 bed = get_elf_backend_data (abfd);
2302 s = bfd_make_section (abfd, ".hash");
2304 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2305 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2307 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
2309 /* Let the backend create the rest of the sections. This lets the
2310 backend set the right flags. The backend will normally create
2311 the .got and .plt sections. */
2312 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
2315 elf_hash_table (info)->dynamic_sections_created = true;
2320 /* Add an entry to the .dynamic table. */
2323 elf_add_dynamic_entry (info, tag, val)
2324 struct bfd_link_info *info;
2328 Elf_Internal_Dyn dyn;
2332 bfd_byte *newcontents;
2334 dynobj = elf_hash_table (info)->dynobj;
2336 s = bfd_get_section_by_name (dynobj, ".dynamic");
2337 BFD_ASSERT (s != NULL);
2339 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
2340 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
2341 if (newcontents == NULL)
2345 dyn.d_un.d_val = val;
2346 elf_swap_dyn_out (dynobj, &dyn,
2347 (Elf_External_Dyn *) (newcontents + s->_raw_size));
2349 s->_raw_size = newsize;
2350 s->contents = newcontents;
2355 /* Record a new local dynamic symbol. */
2358 elf_link_record_local_dynamic_symbol (info, input_bfd, input_indx)
2359 struct bfd_link_info *info;
2363 struct elf_link_local_dynamic_entry *entry;
2364 struct elf_link_hash_table *eht;
2365 struct bfd_strtab_hash *dynstr;
2366 Elf_External_Sym esym;
2367 unsigned long dynstr_index;
2370 /* See if the entry exists already. */
2371 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
2372 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
2375 entry = (struct elf_link_local_dynamic_entry *)
2376 bfd_alloc (input_bfd, sizeof (*entry));
2380 /* Go find the symbol, so that we can find it's name. */
2381 if (bfd_seek (input_bfd,
2382 (elf_tdata (input_bfd)->symtab_hdr.sh_offset
2383 + input_indx * sizeof (Elf_External_Sym)),
2385 || (bfd_read (&esym, sizeof (Elf_External_Sym), 1, input_bfd)
2386 != sizeof (Elf_External_Sym)))
2388 elf_swap_symbol_in (input_bfd, &esym, &entry->isym);
2390 name = (bfd_elf_string_from_elf_section
2391 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
2392 entry->isym.st_name));
2394 dynstr = elf_hash_table (info)->dynstr;
2397 /* Create a strtab to hold the dynamic symbol names. */
2398 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_stringtab_init ();
2403 dynstr_index = _bfd_stringtab_add (dynstr, name, true, false);
2404 if (dynstr_index == (unsigned long) -1)
2406 entry->isym.st_name = dynstr_index;
2408 eht = elf_hash_table (info);
2410 entry->next = eht->dynlocal;
2411 eht->dynlocal = entry;
2412 entry->input_bfd = input_bfd;
2413 entry->input_indx = input_indx;
2416 /* Whatever binding the symbol had before, it's now local. */
2418 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
2420 /* The dynindx will be set at the end of size_dynamic_sections. */
2425 /* Read and swap the relocs from the section indicated by SHDR. This
2426 may be either a REL or a RELA section. The relocations are
2427 translated into RELA relocations and stored in INTERNAL_RELOCS,
2428 which should have already been allocated to contain enough space.
2429 The EXTERNAL_RELOCS are a buffer where the external form of the
2430 relocations should be stored.
2432 Returns false if something goes wrong. */
2435 elf_link_read_relocs_from_section (abfd, shdr, external_relocs,
2438 Elf_Internal_Shdr *shdr;
2439 PTR external_relocs;
2440 Elf_Internal_Rela *internal_relocs;
2442 struct elf_backend_data *bed;
2444 /* If there aren't any relocations, that's OK. */
2448 /* Position ourselves at the start of the section. */
2449 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2452 /* Read the relocations. */
2453 if (bfd_read (external_relocs, 1, shdr->sh_size, abfd)
2457 bed = get_elf_backend_data (abfd);
2459 /* Convert the external relocations to the internal format. */
2460 if (shdr->sh_entsize == sizeof (Elf_External_Rel))
2462 Elf_External_Rel *erel;
2463 Elf_External_Rel *erelend;
2464 Elf_Internal_Rela *irela;
2465 Elf_Internal_Rel *irel;
2467 erel = (Elf_External_Rel *) external_relocs;
2468 erelend = erel + shdr->sh_size / shdr->sh_entsize;
2469 irela = internal_relocs;
2470 irel = bfd_alloc (abfd, (bed->s->int_rels_per_ext_rel
2471 * sizeof (Elf_Internal_Rel)));
2472 for (; erel < erelend; erel++, irela += bed->s->int_rels_per_ext_rel)
2476 if (bed->s->swap_reloc_in)
2477 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
2479 elf_swap_reloc_in (abfd, erel, irel);
2481 for (i = 0; i < bed->s->int_rels_per_ext_rel; ++i)
2483 irela[i].r_offset = irel[i].r_offset;
2484 irela[i].r_info = irel[i].r_info;
2485 irela[i].r_addend = 0;
2491 Elf_External_Rela *erela;
2492 Elf_External_Rela *erelaend;
2493 Elf_Internal_Rela *irela;
2495 BFD_ASSERT (shdr->sh_entsize == sizeof (Elf_External_Rela));
2497 erela = (Elf_External_Rela *) external_relocs;
2498 erelaend = erela + shdr->sh_size / shdr->sh_entsize;
2499 irela = internal_relocs;
2500 for (; erela < erelaend; erela++, irela += bed->s->int_rels_per_ext_rel)
2502 if (bed->s->swap_reloca_in)
2503 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
2505 elf_swap_reloca_in (abfd, erela, irela);
2512 /* Read and swap the relocs for a section O. They may have been
2513 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2514 not NULL, they are used as buffers to read into. They are known to
2515 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2516 the return value is allocated using either malloc or bfd_alloc,
2517 according to the KEEP_MEMORY argument. If O has two relocation
2518 sections (both REL and RELA relocations), then the REL_HDR
2519 relocations will appear first in INTERNAL_RELOCS, followed by the
2520 REL_HDR2 relocations. */
2523 NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
2527 PTR external_relocs;
2528 Elf_Internal_Rela *internal_relocs;
2529 boolean keep_memory;
2531 Elf_Internal_Shdr *rel_hdr;
2533 Elf_Internal_Rela *alloc2 = NULL;
2534 struct elf_backend_data *bed = get_elf_backend_data (abfd);
2536 if (elf_section_data (o)->relocs != NULL)
2537 return elf_section_data (o)->relocs;
2539 if (o->reloc_count == 0)
2542 rel_hdr = &elf_section_data (o)->rel_hdr;
2544 if (internal_relocs == NULL)
2548 size = (o->reloc_count * bed->s->int_rels_per_ext_rel
2549 * sizeof (Elf_Internal_Rela));
2551 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2553 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2554 if (internal_relocs == NULL)
2558 if (external_relocs == NULL)
2560 size_t size = (size_t) rel_hdr->sh_size;
2562 if (elf_section_data (o)->rel_hdr2)
2563 size += (size_t) elf_section_data (o)->rel_hdr2->sh_size;
2564 alloc1 = (PTR) bfd_malloc (size);
2567 external_relocs = alloc1;
2570 if (!elf_link_read_relocs_from_section (abfd, rel_hdr,
2574 if (!elf_link_read_relocs_from_section
2576 elf_section_data (o)->rel_hdr2,
2577 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2578 internal_relocs + (rel_hdr->sh_size / rel_hdr->sh_entsize
2579 * bed->s->int_rels_per_ext_rel)))
2582 /* Cache the results for next time, if we can. */
2584 elf_section_data (o)->relocs = internal_relocs;
2589 /* Don't free alloc2, since if it was allocated we are passing it
2590 back (under the name of internal_relocs). */
2592 return internal_relocs;
2602 /* Record an assignment to a symbol made by a linker script. We need
2603 this in case some dynamic object refers to this symbol. */
2607 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
2608 bfd *output_bfd ATTRIBUTE_UNUSED;
2609 struct bfd_link_info *info;
2613 struct elf_link_hash_entry *h;
2615 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2618 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
2622 if (h->root.type == bfd_link_hash_new)
2623 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
2625 /* If this symbol is being provided by the linker script, and it is
2626 currently defined by a dynamic object, but not by a regular
2627 object, then mark it as undefined so that the generic linker will
2628 force the correct value. */
2630 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2631 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2632 h->root.type = bfd_link_hash_undefined;
2634 /* If this symbol is not being provided by the linker script, and it is
2635 currently defined by a dynamic object, but not by a regular object,
2636 then clear out any version information because the symbol will not be
2637 associated with the dynamic object any more. */
2639 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2640 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2641 h->verinfo.verdef = NULL;
2643 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2645 /* When possible, keep the original type of the symbol */
2646 if (h->type == STT_NOTYPE)
2647 h->type = STT_OBJECT;
2649 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2650 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
2652 && h->dynindx == -1)
2654 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2657 /* If this is a weak defined symbol, and we know a corresponding
2658 real symbol from the same dynamic object, make sure the real
2659 symbol is also made into a dynamic symbol. */
2660 if (h->weakdef != NULL
2661 && h->weakdef->dynindx == -1)
2663 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2671 /* This structure is used to pass information to
2672 elf_link_assign_sym_version. */
2674 struct elf_assign_sym_version_info
2678 /* General link information. */
2679 struct bfd_link_info *info;
2681 struct bfd_elf_version_tree *verdefs;
2682 /* Whether we are exporting all dynamic symbols. */
2683 boolean export_dynamic;
2684 /* Whether we had a failure. */
2688 /* This structure is used to pass information to
2689 elf_link_find_version_dependencies. */
2691 struct elf_find_verdep_info
2695 /* General link information. */
2696 struct bfd_link_info *info;
2697 /* The number of dependencies. */
2699 /* Whether we had a failure. */
2703 /* Array used to determine the number of hash table buckets to use
2704 based on the number of symbols there are. If there are fewer than
2705 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2706 fewer than 37 we use 17 buckets, and so forth. We never use more
2707 than 32771 buckets. */
2709 static const size_t elf_buckets[] =
2711 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2715 /* Compute bucket count for hashing table. We do not use a static set
2716 of possible tables sizes anymore. Instead we determine for all
2717 possible reasonable sizes of the table the outcome (i.e., the
2718 number of collisions etc) and choose the best solution. The
2719 weighting functions are not too simple to allow the table to grow
2720 without bounds. Instead one of the weighting factors is the size.
2721 Therefore the result is always a good payoff between few collisions
2722 (= short chain lengths) and table size. */
2724 compute_bucket_count (info)
2725 struct bfd_link_info *info;
2727 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
2728 size_t best_size = 0;
2729 unsigned long int *hashcodes;
2730 unsigned long int *hashcodesp;
2731 unsigned long int i;
2733 /* Compute the hash values for all exported symbols. At the same
2734 time store the values in an array so that we could use them for
2736 hashcodes = (unsigned long int *) bfd_malloc (dynsymcount
2737 * sizeof (unsigned long int));
2738 if (hashcodes == NULL)
2740 hashcodesp = hashcodes;
2742 /* Put all hash values in HASHCODES. */
2743 elf_link_hash_traverse (elf_hash_table (info),
2744 elf_collect_hash_codes, &hashcodesp);
2746 /* We have a problem here. The following code to optimize the table
2747 size requires an integer type with more the 32 bits. If
2748 BFD_HOST_U_64_BIT is set we know about such a type. */
2749 #ifdef BFD_HOST_U_64_BIT
2750 if (info->optimize == true)
2752 unsigned long int nsyms = hashcodesp - hashcodes;
2755 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
2756 unsigned long int *counts ;
2758 /* Possible optimization parameters: if we have NSYMS symbols we say
2759 that the hashing table must at least have NSYMS/4 and at most
2761 minsize = nsyms / 4;
2764 best_size = maxsize = nsyms * 2;
2766 /* Create array where we count the collisions in. We must use bfd_malloc
2767 since the size could be large. */
2768 counts = (unsigned long int *) bfd_malloc (maxsize
2769 * sizeof (unsigned long int));
2776 /* Compute the "optimal" size for the hash table. The criteria is a
2777 minimal chain length. The minor criteria is (of course) the size
2779 for (i = minsize; i < maxsize; ++i)
2781 /* Walk through the array of hashcodes and count the collisions. */
2782 BFD_HOST_U_64_BIT max;
2783 unsigned long int j;
2784 unsigned long int fact;
2786 memset (counts, '\0', i * sizeof (unsigned long int));
2788 /* Determine how often each hash bucket is used. */
2789 for (j = 0; j < nsyms; ++j)
2790 ++counts[hashcodes[j] % i];
2792 /* For the weight function we need some information about the
2793 pagesize on the target. This is information need not be 100%
2794 accurate. Since this information is not available (so far) we
2795 define it here to a reasonable default value. If it is crucial
2796 to have a better value some day simply define this value. */
2797 # ifndef BFD_TARGET_PAGESIZE
2798 # define BFD_TARGET_PAGESIZE (4096)
2801 /* We in any case need 2 + NSYMS entries for the size values and
2803 max = (2 + nsyms) * (ARCH_SIZE / 8);
2806 /* Variant 1: optimize for short chains. We add the squares
2807 of all the chain lengths (which favous many small chain
2808 over a few long chains). */
2809 for (j = 0; j < i; ++j)
2810 max += counts[j] * counts[j];
2812 /* This adds penalties for the overall size of the table. */
2813 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2816 /* Variant 2: Optimize a lot more for small table. Here we
2817 also add squares of the size but we also add penalties for
2818 empty slots (the +1 term). */
2819 for (j = 0; j < i; ++j)
2820 max += (1 + counts[j]) * (1 + counts[j]);
2822 /* The overall size of the table is considered, but not as
2823 strong as in variant 1, where it is squared. */
2824 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2828 /* Compare with current best results. */
2829 if (max < best_chlen)
2839 #endif /* defined (BFD_HOST_U_64_BIT) */
2841 /* This is the fallback solution if no 64bit type is available or if we
2842 are not supposed to spend much time on optimizations. We select the
2843 bucket count using a fixed set of numbers. */
2844 for (i = 0; elf_buckets[i] != 0; i++)
2846 best_size = elf_buckets[i];
2847 if (dynsymcount < elf_buckets[i + 1])
2852 /* Free the arrays we needed. */
2858 /* Set up the sizes and contents of the ELF dynamic sections. This is
2859 called by the ELF linker emulation before_allocation routine. We
2860 must set the sizes of the sections before the linker sets the
2861 addresses of the various sections. */
2864 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
2865 export_dynamic, filter_shlib,
2866 auxiliary_filters, info, sinterpptr,
2871 boolean export_dynamic;
2872 const char *filter_shlib;
2873 const char * const *auxiliary_filters;
2874 struct bfd_link_info *info;
2875 asection **sinterpptr;
2876 struct bfd_elf_version_tree *verdefs;
2878 bfd_size_type soname_indx;
2880 struct elf_backend_data *bed;
2881 struct elf_assign_sym_version_info asvinfo;
2885 soname_indx = (bfd_size_type) -1;
2887 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2890 /* The backend may have to create some sections regardless of whether
2891 we're dynamic or not. */
2892 bed = get_elf_backend_data (output_bfd);
2893 if (bed->elf_backend_always_size_sections
2894 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
2897 dynobj = elf_hash_table (info)->dynobj;
2899 /* If there were no dynamic objects in the link, there is nothing to
2904 if (elf_hash_table (info)->dynamic_sections_created)
2906 struct elf_info_failed eif;
2907 struct elf_link_hash_entry *h;
2910 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
2911 BFD_ASSERT (*sinterpptr != NULL || info->shared);
2915 soname_indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2916 soname, true, true);
2917 if (soname_indx == (bfd_size_type) -1
2918 || ! elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
2924 if (! elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
2926 info->flags |= DF_SYMBOLIC;
2933 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, rpath,
2935 if (indx == (bfd_size_type) -1
2936 || ! elf_add_dynamic_entry (info, DT_RPATH, indx)
2938 && ! elf_add_dynamic_entry (info, DT_RUNPATH, indx)))
2942 if (filter_shlib != NULL)
2946 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2947 filter_shlib, true, true);
2948 if (indx == (bfd_size_type) -1
2949 || ! elf_add_dynamic_entry (info, DT_FILTER, indx))
2953 if (auxiliary_filters != NULL)
2955 const char * const *p;
2957 for (p = auxiliary_filters; *p != NULL; p++)
2961 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2963 if (indx == (bfd_size_type) -1
2964 || ! elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
2972 /* If we are supposed to export all symbols into the dynamic symbol
2973 table (this is not the normal case), then do so. */
2976 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
2982 /* Attach all the symbols to their version information. */
2983 asvinfo.output_bfd = output_bfd;
2984 asvinfo.info = info;
2985 asvinfo.verdefs = verdefs;
2986 asvinfo.export_dynamic = export_dynamic;
2987 asvinfo.failed = false;
2989 elf_link_hash_traverse (elf_hash_table (info),
2990 elf_link_assign_sym_version,
2995 /* Find all symbols which were defined in a dynamic object and make
2996 the backend pick a reasonable value for them. */
2997 elf_link_hash_traverse (elf_hash_table (info),
2998 elf_adjust_dynamic_symbol,
3003 /* Add some entries to the .dynamic section. We fill in some of the
3004 values later, in elf_bfd_final_link, but we must add the entries
3005 now so that we know the final size of the .dynamic section. */
3007 /* If there are initialization and/or finalization functions to
3008 call then add the corresponding DT_INIT/DT_FINI entries. */
3009 h = (info->init_function
3010 ? elf_link_hash_lookup (elf_hash_table (info),
3011 info->init_function, false,
3015 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3016 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3018 if (! elf_add_dynamic_entry (info, DT_INIT, 0))
3021 h = (info->fini_function
3022 ? elf_link_hash_lookup (elf_hash_table (info),
3023 info->fini_function, false,
3027 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3028 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3030 if (! elf_add_dynamic_entry (info, DT_FINI, 0))
3034 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
3035 /* If .dynstr is excluded from the link, we don't want any of
3036 these tags. Strictly, we should be checking each section
3037 individually; This quick check covers for the case where
3038 someone does a /DISCARD/ : { *(*) }. */
3039 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
3041 bfd_size_type strsize;
3043 strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
3044 if (! elf_add_dynamic_entry (info, DT_HASH, 0)
3045 || ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
3046 || ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
3047 || ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
3048 || ! elf_add_dynamic_entry (info, DT_SYMENT,
3049 sizeof (Elf_External_Sym)))
3054 /* The backend must work out the sizes of all the other dynamic
3056 if (bed->elf_backend_size_dynamic_sections
3057 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
3060 if (elf_hash_table (info)->dynamic_sections_created)
3064 size_t bucketcount = 0;
3065 size_t hash_entry_size;
3067 /* Set up the version definition section. */
3068 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3069 BFD_ASSERT (s != NULL);
3071 /* We may have created additional version definitions if we are
3072 just linking a regular application. */
3073 verdefs = asvinfo.verdefs;
3075 if (verdefs == NULL)
3076 _bfd_strip_section_from_output (info, s);
3081 struct bfd_elf_version_tree *t;
3083 Elf_Internal_Verdef def;
3084 Elf_Internal_Verdaux defaux;
3089 /* Make space for the base version. */
3090 size += sizeof (Elf_External_Verdef);
3091 size += sizeof (Elf_External_Verdaux);
3094 for (t = verdefs; t != NULL; t = t->next)
3096 struct bfd_elf_version_deps *n;
3098 size += sizeof (Elf_External_Verdef);
3099 size += sizeof (Elf_External_Verdaux);
3102 for (n = t->deps; n != NULL; n = n->next)
3103 size += sizeof (Elf_External_Verdaux);
3106 s->_raw_size = size;
3107 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3108 if (s->contents == NULL && s->_raw_size != 0)
3111 /* Fill in the version definition section. */
3115 def.vd_version = VER_DEF_CURRENT;
3116 def.vd_flags = VER_FLG_BASE;
3119 def.vd_aux = sizeof (Elf_External_Verdef);
3120 def.vd_next = (sizeof (Elf_External_Verdef)
3121 + sizeof (Elf_External_Verdaux));
3123 if (soname_indx != (bfd_size_type) -1)
3125 def.vd_hash = bfd_elf_hash (soname);
3126 defaux.vda_name = soname_indx;
3133 name = output_bfd->filename;
3134 def.vd_hash = bfd_elf_hash (name);
3135 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3137 if (indx == (bfd_size_type) -1)
3139 defaux.vda_name = indx;
3141 defaux.vda_next = 0;
3143 _bfd_elf_swap_verdef_out (output_bfd, &def,
3144 (Elf_External_Verdef *)p);
3145 p += sizeof (Elf_External_Verdef);
3146 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3147 (Elf_External_Verdaux *) p);
3148 p += sizeof (Elf_External_Verdaux);
3150 for (t = verdefs; t != NULL; t = t->next)
3153 struct bfd_elf_version_deps *n;
3154 struct elf_link_hash_entry *h;
3157 for (n = t->deps; n != NULL; n = n->next)
3160 /* Add a symbol representing this version. */
3162 if (! (_bfd_generic_link_add_one_symbol
3163 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
3164 (bfd_vma) 0, (const char *) NULL, false,
3165 get_elf_backend_data (dynobj)->collect,
3166 (struct bfd_link_hash_entry **) &h)))
3168 h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
3169 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3170 h->type = STT_OBJECT;
3171 h->verinfo.vertree = t;
3173 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
3176 def.vd_version = VER_DEF_CURRENT;
3178 if (t->globals == NULL && t->locals == NULL && ! t->used)
3179 def.vd_flags |= VER_FLG_WEAK;
3180 def.vd_ndx = t->vernum + 1;
3181 def.vd_cnt = cdeps + 1;
3182 def.vd_hash = bfd_elf_hash (t->name);
3183 def.vd_aux = sizeof (Elf_External_Verdef);
3184 if (t->next != NULL)
3185 def.vd_next = (sizeof (Elf_External_Verdef)
3186 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
3190 _bfd_elf_swap_verdef_out (output_bfd, &def,
3191 (Elf_External_Verdef *) p);
3192 p += sizeof (Elf_External_Verdef);
3194 defaux.vda_name = h->dynstr_index;
3195 if (t->deps == NULL)
3196 defaux.vda_next = 0;
3198 defaux.vda_next = sizeof (Elf_External_Verdaux);
3199 t->name_indx = defaux.vda_name;
3201 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3202 (Elf_External_Verdaux *) p);
3203 p += sizeof (Elf_External_Verdaux);
3205 for (n = t->deps; n != NULL; n = n->next)
3207 if (n->version_needed == NULL)
3209 /* This can happen if there was an error in the
3211 defaux.vda_name = 0;
3214 defaux.vda_name = n->version_needed->name_indx;
3215 if (n->next == NULL)
3216 defaux.vda_next = 0;
3218 defaux.vda_next = sizeof (Elf_External_Verdaux);
3220 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3221 (Elf_External_Verdaux *) p);
3222 p += sizeof (Elf_External_Verdaux);
3226 if (! elf_add_dynamic_entry (info, DT_VERDEF, 0)
3227 || ! elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
3230 elf_tdata (output_bfd)->cverdefs = cdefs;
3233 if (info->new_dtags && info->flags)
3235 if (! elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
3242 info->flags_1 &= ~ (DF_1_INITFIRST
3245 if (! elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
3249 /* Work out the size of the version reference section. */
3251 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3252 BFD_ASSERT (s != NULL);
3254 struct elf_find_verdep_info sinfo;
3256 sinfo.output_bfd = output_bfd;
3258 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
3259 if (sinfo.vers == 0)
3261 sinfo.failed = false;
3263 elf_link_hash_traverse (elf_hash_table (info),
3264 elf_link_find_version_dependencies,
3267 if (elf_tdata (output_bfd)->verref == NULL)
3268 _bfd_strip_section_from_output (info, s);
3271 Elf_Internal_Verneed *t;
3276 /* Build the version definition section. */
3279 for (t = elf_tdata (output_bfd)->verref;
3283 Elf_Internal_Vernaux *a;
3285 size += sizeof (Elf_External_Verneed);
3287 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3288 size += sizeof (Elf_External_Vernaux);
3291 s->_raw_size = size;
3292 s->contents = (bfd_byte *) bfd_alloc (output_bfd, size);
3293 if (s->contents == NULL)
3297 for (t = elf_tdata (output_bfd)->verref;
3302 Elf_Internal_Vernaux *a;
3306 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3309 t->vn_version = VER_NEED_CURRENT;
3311 if (elf_dt_name (t->vn_bfd) != NULL)
3312 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3313 elf_dt_name (t->vn_bfd),
3316 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3317 basename (t->vn_bfd->filename),
3319 if (indx == (bfd_size_type) -1)
3322 t->vn_aux = sizeof (Elf_External_Verneed);
3323 if (t->vn_nextref == NULL)
3326 t->vn_next = (sizeof (Elf_External_Verneed)
3327 + caux * sizeof (Elf_External_Vernaux));
3329 _bfd_elf_swap_verneed_out (output_bfd, t,
3330 (Elf_External_Verneed *) p);
3331 p += sizeof (Elf_External_Verneed);
3333 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3335 a->vna_hash = bfd_elf_hash (a->vna_nodename);
3336 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3337 a->vna_nodename, true, false);
3338 if (indx == (bfd_size_type) -1)
3341 if (a->vna_nextptr == NULL)
3344 a->vna_next = sizeof (Elf_External_Vernaux);
3346 _bfd_elf_swap_vernaux_out (output_bfd, a,
3347 (Elf_External_Vernaux *) p);
3348 p += sizeof (Elf_External_Vernaux);
3352 if (! elf_add_dynamic_entry (info, DT_VERNEED, 0)
3353 || ! elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
3356 elf_tdata (output_bfd)->cverrefs = crefs;
3360 /* Assign dynsym indicies. In a shared library we generate a
3361 section symbol for each output section, which come first.
3362 Next come all of the back-end allocated local dynamic syms,
3363 followed by the rest of the global symbols. */
3365 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3367 /* Work out the size of the symbol version section. */
3368 s = bfd_get_section_by_name (dynobj, ".gnu.version");
3369 BFD_ASSERT (s != NULL);
3370 if (dynsymcount == 0
3371 || (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
3373 _bfd_strip_section_from_output (info, s);
3374 /* The DYNSYMCOUNT might have changed if we were going to
3375 output a dynamic symbol table entry for S. */
3376 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3380 s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
3381 s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3382 if (s->contents == NULL)
3385 if (! elf_add_dynamic_entry (info, DT_VERSYM, 0))
3389 /* Set the size of the .dynsym and .hash sections. We counted
3390 the number of dynamic symbols in elf_link_add_object_symbols.
3391 We will build the contents of .dynsym and .hash when we build
3392 the final symbol table, because until then we do not know the
3393 correct value to give the symbols. We built the .dynstr
3394 section as we went along in elf_link_add_object_symbols. */
3395 s = bfd_get_section_by_name (dynobj, ".dynsym");
3396 BFD_ASSERT (s != NULL);
3397 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
3398 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3399 if (s->contents == NULL && s->_raw_size != 0)
3402 if (dynsymcount != 0)
3404 Elf_Internal_Sym isym;
3406 /* The first entry in .dynsym is a dummy symbol. */
3413 elf_swap_symbol_out (output_bfd, &isym,
3414 (PTR) (Elf_External_Sym *) s->contents);
3417 /* Compute the size of the hashing table. As a side effect this
3418 computes the hash values for all the names we export. */
3419 bucketcount = compute_bucket_count (info);
3421 s = bfd_get_section_by_name (dynobj, ".hash");
3422 BFD_ASSERT (s != NULL);
3423 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
3424 s->_raw_size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
3425 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3426 if (s->contents == NULL)
3428 memset (s->contents, 0, (size_t) s->_raw_size);
3430 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
3431 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
3432 s->contents + hash_entry_size);
3434 elf_hash_table (info)->bucketcount = bucketcount;
3436 s = bfd_get_section_by_name (dynobj, ".dynstr");
3437 BFD_ASSERT (s != NULL);
3438 s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
3440 if (! elf_add_dynamic_entry (info, DT_NULL, 0))
3447 /* Fix up the flags for a symbol. This handles various cases which
3448 can only be fixed after all the input files are seen. This is
3449 currently called by both adjust_dynamic_symbol and
3450 assign_sym_version, which is unnecessary but perhaps more robust in
3451 the face of future changes. */
3454 elf_fix_symbol_flags (h, eif)
3455 struct elf_link_hash_entry *h;
3456 struct elf_info_failed *eif;
3458 /* If this symbol was mentioned in a non-ELF file, try to set
3459 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3460 permit a non-ELF file to correctly refer to a symbol defined in
3461 an ELF dynamic object. */
3462 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
3464 while (h->root.type == bfd_link_hash_indirect)
3465 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3467 if (h->root.type != bfd_link_hash_defined
3468 && h->root.type != bfd_link_hash_defweak)
3469 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3470 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3473 if (h->root.u.def.section->owner != NULL
3474 && (bfd_get_flavour (h->root.u.def.section->owner)
3475 == bfd_target_elf_flavour))
3476 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3477 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3479 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3482 if (h->dynindx == -1
3483 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3484 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
3486 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3495 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3496 was first seen in a non-ELF file. Fortunately, if the symbol
3497 was first seen in an ELF file, we're probably OK unless the
3498 symbol was defined in a non-ELF file. Catch that case here.
3499 FIXME: We're still in trouble if the symbol was first seen in
3500 a dynamic object, and then later in a non-ELF regular object. */
3501 if ((h->root.type == bfd_link_hash_defined
3502 || h->root.type == bfd_link_hash_defweak)
3503 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3504 && (h->root.u.def.section->owner != NULL
3505 ? (bfd_get_flavour (h->root.u.def.section->owner)
3506 != bfd_target_elf_flavour)
3507 : (bfd_is_abs_section (h->root.u.def.section)
3508 && (h->elf_link_hash_flags
3509 & ELF_LINK_HASH_DEF_DYNAMIC) == 0)))
3510 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3513 /* If this is a final link, and the symbol was defined as a common
3514 symbol in a regular object file, and there was no definition in
3515 any dynamic object, then the linker will have allocated space for
3516 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3517 flag will not have been set. */
3518 if (h->root.type == bfd_link_hash_defined
3519 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3520 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
3521 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3522 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
3523 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3525 /* If -Bsymbolic was used (which means to bind references to global
3526 symbols to the definition within the shared object), and this
3527 symbol was defined in a regular object, then it actually doesn't
3528 need a PLT entry, and we can accomplish that by forcing it local.
3529 Likewise, if the symbol has hidden or internal visibility.
3530 FIXME: It might be that we also do not need a PLT for other
3531 non-hidden visibilities, but we would have to tell that to the
3532 backend specifically; we can't just clear PLT-related data here. */
3533 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
3534 && eif->info->shared
3535 && (eif->info->symbolic
3536 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3537 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
3538 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3540 struct elf_backend_data *bed;
3541 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3542 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3543 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
3544 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
3545 (*bed->elf_backend_hide_symbol) (eif->info, h);
3548 /* If this is a weak defined symbol in a dynamic object, and we know
3549 the real definition in the dynamic object, copy interesting flags
3550 over to the real definition. */
3551 if (h->weakdef != NULL)
3553 struct elf_link_hash_entry *weakdef;
3555 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3556 || h->root.type == bfd_link_hash_defweak);
3557 weakdef = h->weakdef;
3558 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
3559 || weakdef->root.type == bfd_link_hash_defweak);
3560 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
3562 /* If the real definition is defined by a regular object file,
3563 don't do anything special. See the longer description in
3564 elf_adjust_dynamic_symbol, below. */
3565 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3568 weakdef->elf_link_hash_flags |=
3569 (h->elf_link_hash_flags
3570 & (ELF_LINK_HASH_REF_REGULAR
3571 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3572 | ELF_LINK_NON_GOT_REF));
3578 /* Make the backend pick a good value for a dynamic symbol. This is
3579 called via elf_link_hash_traverse, and also calls itself
3583 elf_adjust_dynamic_symbol (h, data)
3584 struct elf_link_hash_entry *h;
3587 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3589 struct elf_backend_data *bed;
3591 /* Ignore indirect symbols. These are added by the versioning code. */
3592 if (h->root.type == bfd_link_hash_indirect)
3595 /* Fix the symbol flags. */
3596 if (! elf_fix_symbol_flags (h, eif))
3599 /* If this symbol does not require a PLT entry, and it is not
3600 defined by a dynamic object, or is not referenced by a regular
3601 object, ignore it. We do have to handle a weak defined symbol,
3602 even if no regular object refers to it, if we decided to add it
3603 to the dynamic symbol table. FIXME: Do we normally need to worry
3604 about symbols which are defined by one dynamic object and
3605 referenced by another one? */
3606 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
3607 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3608 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3609 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
3610 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
3612 h->plt.offset = (bfd_vma) -1;
3616 /* If we've already adjusted this symbol, don't do it again. This
3617 can happen via a recursive call. */
3618 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
3621 /* Don't look at this symbol again. Note that we must set this
3622 after checking the above conditions, because we may look at a
3623 symbol once, decide not to do anything, and then get called
3624 recursively later after REF_REGULAR is set below. */
3625 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
3627 /* If this is a weak definition, and we know a real definition, and
3628 the real symbol is not itself defined by a regular object file,
3629 then get a good value for the real definition. We handle the
3630 real symbol first, for the convenience of the backend routine.
3632 Note that there is a confusing case here. If the real definition
3633 is defined by a regular object file, we don't get the real symbol
3634 from the dynamic object, but we do get the weak symbol. If the
3635 processor backend uses a COPY reloc, then if some routine in the
3636 dynamic object changes the real symbol, we will not see that
3637 change in the corresponding weak symbol. This is the way other
3638 ELF linkers work as well, and seems to be a result of the shared
3641 I will clarify this issue. Most SVR4 shared libraries define the
3642 variable _timezone and define timezone as a weak synonym. The
3643 tzset call changes _timezone. If you write
3644 extern int timezone;
3646 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3647 you might expect that, since timezone is a synonym for _timezone,
3648 the same number will print both times. However, if the processor
3649 backend uses a COPY reloc, then actually timezone will be copied
3650 into your process image, and, since you define _timezone
3651 yourself, _timezone will not. Thus timezone and _timezone will
3652 wind up at different memory locations. The tzset call will set
3653 _timezone, leaving timezone unchanged. */
3655 if (h->weakdef != NULL)
3657 /* If we get to this point, we know there is an implicit
3658 reference by a regular object file via the weak symbol H.
3659 FIXME: Is this really true? What if the traversal finds
3660 H->WEAKDEF before it finds H? */
3661 h->weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
3663 if (! elf_adjust_dynamic_symbol (h->weakdef, (PTR) eif))
3667 /* If a symbol has no type and no size and does not require a PLT
3668 entry, then we are probably about to do the wrong thing here: we
3669 are probably going to create a COPY reloc for an empty object.
3670 This case can arise when a shared object is built with assembly
3671 code, and the assembly code fails to set the symbol type. */
3673 && h->type == STT_NOTYPE
3674 && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0)
3675 (*_bfd_error_handler)
3676 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3677 h->root.root.string);
3679 dynobj = elf_hash_table (eif->info)->dynobj;
3680 bed = get_elf_backend_data (dynobj);
3681 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
3690 /* This routine is used to export all defined symbols into the dynamic
3691 symbol table. It is called via elf_link_hash_traverse. */
3694 elf_export_symbol (h, data)
3695 struct elf_link_hash_entry *h;
3698 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3700 /* Ignore indirect symbols. These are added by the versioning code. */
3701 if (h->root.type == bfd_link_hash_indirect)
3704 if (h->dynindx == -1
3705 && (h->elf_link_hash_flags
3706 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
3708 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3718 /* Look through the symbols which are defined in other shared
3719 libraries and referenced here. Update the list of version
3720 dependencies. This will be put into the .gnu.version_r section.
3721 This function is called via elf_link_hash_traverse. */
3724 elf_link_find_version_dependencies (h, data)
3725 struct elf_link_hash_entry *h;
3728 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
3729 Elf_Internal_Verneed *t;
3730 Elf_Internal_Vernaux *a;
3732 /* We only care about symbols defined in shared objects with version
3734 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3735 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3737 || h->verinfo.verdef == NULL)
3740 /* See if we already know about this version. */
3741 for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
3743 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
3746 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3747 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
3753 /* This is a new version. Add it to tree we are building. */
3757 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, sizeof *t);
3760 rinfo->failed = true;
3764 t->vn_bfd = h->verinfo.verdef->vd_bfd;
3765 t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
3766 elf_tdata (rinfo->output_bfd)->verref = t;
3769 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, sizeof *a);
3771 /* Note that we are copying a string pointer here, and testing it
3772 above. If bfd_elf_string_from_elf_section is ever changed to
3773 discard the string data when low in memory, this will have to be
3775 a->vna_nodename = h->verinfo.verdef->vd_nodename;
3777 a->vna_flags = h->verinfo.verdef->vd_flags;
3778 a->vna_nextptr = t->vn_auxptr;
3780 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
3783 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
3790 /* Figure out appropriate versions for all the symbols. We may not
3791 have the version number script until we have read all of the input
3792 files, so until that point we don't know which symbols should be
3793 local. This function is called via elf_link_hash_traverse. */
3796 elf_link_assign_sym_version (h, data)
3797 struct elf_link_hash_entry *h;
3800 struct elf_assign_sym_version_info *sinfo =
3801 (struct elf_assign_sym_version_info *) data;
3802 struct bfd_link_info *info = sinfo->info;
3803 struct elf_backend_data *bed;
3804 struct elf_info_failed eif;
3807 /* Fix the symbol flags. */
3810 if (! elf_fix_symbol_flags (h, &eif))
3813 sinfo->failed = true;
3817 /* We only need version numbers for symbols defined in regular
3819 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3822 bed = get_elf_backend_data (sinfo->output_bfd);
3823 p = strchr (h->root.root.string, ELF_VER_CHR);
3824 if (p != NULL && h->verinfo.vertree == NULL)
3826 struct bfd_elf_version_tree *t;
3831 /* There are two consecutive ELF_VER_CHR characters if this is
3832 not a hidden symbol. */
3834 if (*p == ELF_VER_CHR)
3840 /* If there is no version string, we can just return out. */
3844 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
3848 /* Look for the version. If we find it, it is no longer weak. */
3849 for (t = sinfo->verdefs; t != NULL; t = t->next)
3851 if (strcmp (t->name, p) == 0)
3855 struct bfd_elf_version_expr *d;
3857 len = p - h->root.root.string;
3858 alc = bfd_alloc (sinfo->output_bfd, len);
3861 strncpy (alc, h->root.root.string, len - 1);
3862 alc[len - 1] = '\0';
3863 if (alc[len - 2] == ELF_VER_CHR)
3864 alc[len - 2] = '\0';
3866 h->verinfo.vertree = t;
3870 if (t->globals != NULL)
3872 for (d = t->globals; d != NULL; d = d->next)
3873 if ((*d->match) (d, alc))
3877 /* See if there is anything to force this symbol to
3879 if (d == NULL && t->locals != NULL)
3881 for (d = t->locals; d != NULL; d = d->next)
3883 if ((*d->match) (d, alc))
3885 if (h->dynindx != -1
3887 && ! sinfo->export_dynamic)
3889 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
3890 (*bed->elf_backend_hide_symbol) (info, h);
3891 /* FIXME: The name of the symbol has
3892 already been recorded in the dynamic
3893 string table section. */
3901 bfd_release (sinfo->output_bfd, alc);
3906 /* If we are building an application, we need to create a
3907 version node for this version. */
3908 if (t == NULL && ! info->shared)
3910 struct bfd_elf_version_tree **pp;
3913 /* If we aren't going to export this symbol, we don't need
3914 to worry about it. */
3915 if (h->dynindx == -1)
3918 t = ((struct bfd_elf_version_tree *)
3919 bfd_alloc (sinfo->output_bfd, sizeof *t));
3922 sinfo->failed = true;
3931 t->name_indx = (unsigned int) -1;
3935 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
3937 t->vernum = version_index;
3941 h->verinfo.vertree = t;
3945 /* We could not find the version for a symbol when
3946 generating a shared archive. Return an error. */
3947 (*_bfd_error_handler)
3948 (_("%s: undefined versioned symbol name %s"),
3949 bfd_get_filename (sinfo->output_bfd), h->root.root.string);
3950 bfd_set_error (bfd_error_bad_value);
3951 sinfo->failed = true;
3956 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
3959 /* If we don't have a version for this symbol, see if we can find
3961 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
3963 struct bfd_elf_version_tree *t;
3964 struct bfd_elf_version_tree *deflt;
3965 struct bfd_elf_version_expr *d;
3967 /* See if can find what version this symbol is in. If the
3968 symbol is supposed to be local, then don't actually register
3971 for (t = sinfo->verdefs; t != NULL; t = t->next)
3973 if (t->globals != NULL)
3975 for (d = t->globals; d != NULL; d = d->next)
3977 if ((*d->match) (d, h->root.root.string))
3979 h->verinfo.vertree = t;
3988 if (t->locals != NULL)
3990 for (d = t->locals; d != NULL; d = d->next)
3992 if (d->pattern[0] == '*' && d->pattern[1] == '\0')
3994 else if ((*d->match) (d, h->root.root.string))
3996 h->verinfo.vertree = t;
3997 if (h->dynindx != -1
3999 && ! sinfo->export_dynamic)
4001 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
4002 (*bed->elf_backend_hide_symbol) (info, h);
4003 /* FIXME: The name of the symbol has already
4004 been recorded in the dynamic string table
4016 if (deflt != NULL && h->verinfo.vertree == NULL)
4018 h->verinfo.vertree = deflt;
4019 if (h->dynindx != -1
4021 && ! sinfo->export_dynamic)
4023 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
4024 (*bed->elf_backend_hide_symbol) (info, h);
4025 /* FIXME: The name of the symbol has already been
4026 recorded in the dynamic string table section. */
4034 /* Final phase of ELF linker. */
4036 /* A structure we use to avoid passing large numbers of arguments. */
4038 struct elf_final_link_info
4040 /* General link information. */
4041 struct bfd_link_info *info;
4044 /* Symbol string table. */
4045 struct bfd_strtab_hash *symstrtab;
4046 /* .dynsym section. */
4047 asection *dynsym_sec;
4048 /* .hash section. */
4050 /* symbol version section (.gnu.version). */
4051 asection *symver_sec;
4052 /* Buffer large enough to hold contents of any section. */
4054 /* Buffer large enough to hold external relocs of any section. */
4055 PTR external_relocs;
4056 /* Buffer large enough to hold internal relocs of any section. */
4057 Elf_Internal_Rela *internal_relocs;
4058 /* Buffer large enough to hold external local symbols of any input
4060 Elf_External_Sym *external_syms;
4061 /* Buffer large enough to hold internal local symbols of any input
4063 Elf_Internal_Sym *internal_syms;
4064 /* Array large enough to hold a symbol index for each local symbol
4065 of any input BFD. */
4067 /* Array large enough to hold a section pointer for each local
4068 symbol of any input BFD. */
4069 asection **sections;
4070 /* Buffer to hold swapped out symbols. */
4071 Elf_External_Sym *symbuf;
4072 /* Number of swapped out symbols in buffer. */
4073 size_t symbuf_count;
4074 /* Number of symbols which fit in symbuf. */
4078 static boolean elf_link_output_sym
4079 PARAMS ((struct elf_final_link_info *, const char *,
4080 Elf_Internal_Sym *, asection *));
4081 static boolean elf_link_flush_output_syms
4082 PARAMS ((struct elf_final_link_info *));
4083 static boolean elf_link_output_extsym
4084 PARAMS ((struct elf_link_hash_entry *, PTR));
4085 static boolean elf_link_sec_merge_syms
4086 PARAMS ((struct elf_link_hash_entry *, PTR));
4087 static boolean elf_link_input_bfd
4088 PARAMS ((struct elf_final_link_info *, bfd *));
4089 static boolean elf_reloc_link_order
4090 PARAMS ((bfd *, struct bfd_link_info *, asection *,
4091 struct bfd_link_order *));
4093 /* This struct is used to pass information to elf_link_output_extsym. */
4095 struct elf_outext_info
4099 struct elf_final_link_info *finfo;
4102 /* Compute the size of, and allocate space for, REL_HDR which is the
4103 section header for a section containing relocations for O. */
4106 elf_link_size_reloc_section (abfd, rel_hdr, o)
4108 Elf_Internal_Shdr *rel_hdr;
4111 register struct elf_link_hash_entry **p, **pend;
4112 unsigned reloc_count;
4114 /* Figure out how many relocations there will be. */
4115 if (rel_hdr == &elf_section_data (o)->rel_hdr)
4116 reloc_count = elf_section_data (o)->rel_count;
4118 reloc_count = elf_section_data (o)->rel_count2;
4120 /* That allows us to calculate the size of the section. */
4121 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
4123 /* The contents field must last into write_object_contents, so we
4124 allocate it with bfd_alloc rather than malloc. Also since we
4125 cannot be sure that the contents will actually be filled in,
4126 we zero the allocated space. */
4127 rel_hdr->contents = (PTR) bfd_zalloc (abfd, rel_hdr->sh_size);
4128 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
4131 /* We only allocate one set of hash entries, so we only do it the
4132 first time we are called. */
4133 if (elf_section_data (o)->rel_hashes == NULL)
4135 p = ((struct elf_link_hash_entry **)
4136 bfd_malloc (o->reloc_count
4137 * sizeof (struct elf_link_hash_entry *)));
4138 if (p == NULL && o->reloc_count != 0)
4141 elf_section_data (o)->rel_hashes = p;
4142 pend = p + o->reloc_count;
4143 for (; p < pend; p++)
4150 /* When performing a relocateable link, the input relocations are
4151 preserved. But, if they reference global symbols, the indices
4152 referenced must be updated. Update all the relocations in
4153 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4156 elf_link_adjust_relocs (abfd, rel_hdr, count, rel_hash)
4158 Elf_Internal_Shdr *rel_hdr;
4160 struct elf_link_hash_entry **rel_hash;
4163 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4165 for (i = 0; i < count; i++, rel_hash++)
4167 if (*rel_hash == NULL)
4170 BFD_ASSERT ((*rel_hash)->indx >= 0);
4172 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
4174 Elf_External_Rel *erel;
4175 Elf_Internal_Rel irel;
4177 erel = (Elf_External_Rel *) rel_hdr->contents + i;
4178 if (bed->s->swap_reloc_in)
4179 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, &irel);
4181 elf_swap_reloc_in (abfd, erel, &irel);
4182 irel.r_info = ELF_R_INFO ((*rel_hash)->indx,
4183 ELF_R_TYPE (irel.r_info));
4184 if (bed->s->swap_reloc_out)
4185 (*bed->s->swap_reloc_out) (abfd, &irel, (bfd_byte *) erel);
4187 elf_swap_reloc_out (abfd, &irel, erel);
4191 Elf_External_Rela *erela;
4192 Elf_Internal_Rela irela;
4194 BFD_ASSERT (rel_hdr->sh_entsize
4195 == sizeof (Elf_External_Rela));
4197 erela = (Elf_External_Rela *) rel_hdr->contents + i;
4198 if (bed->s->swap_reloca_in)
4199 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, &irela);
4201 elf_swap_reloca_in (abfd, erela, &irela);
4202 irela.r_info = ELF_R_INFO ((*rel_hash)->indx,
4203 ELF_R_TYPE (irela.r_info));
4204 if (bed->s->swap_reloca_out)
4205 (*bed->s->swap_reloca_out) (abfd, &irela, (bfd_byte *) erela);
4207 elf_swap_reloca_out (abfd, &irela, erela);
4212 /* Do the final step of an ELF link. */
4215 elf_bfd_final_link (abfd, info)
4217 struct bfd_link_info *info;
4221 struct elf_final_link_info finfo;
4222 register asection *o;
4223 register struct bfd_link_order *p;
4225 size_t max_contents_size;
4226 size_t max_external_reloc_size;
4227 size_t max_internal_reloc_count;
4228 size_t max_sym_count;
4230 Elf_Internal_Sym elfsym;
4232 Elf_Internal_Shdr *symtab_hdr;
4233 Elf_Internal_Shdr *symstrtab_hdr;
4234 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4235 struct elf_outext_info eoinfo;
4239 abfd->flags |= DYNAMIC;
4241 dynamic = elf_hash_table (info)->dynamic_sections_created;
4242 dynobj = elf_hash_table (info)->dynobj;
4245 finfo.output_bfd = abfd;
4246 finfo.symstrtab = elf_stringtab_init ();
4247 if (finfo.symstrtab == NULL)
4252 finfo.dynsym_sec = NULL;
4253 finfo.hash_sec = NULL;
4254 finfo.symver_sec = NULL;
4258 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
4259 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
4260 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
4261 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
4262 /* Note that it is OK if symver_sec is NULL. */
4265 finfo.contents = NULL;
4266 finfo.external_relocs = NULL;
4267 finfo.internal_relocs = NULL;
4268 finfo.external_syms = NULL;
4269 finfo.internal_syms = NULL;
4270 finfo.indices = NULL;
4271 finfo.sections = NULL;
4272 finfo.symbuf = NULL;
4273 finfo.symbuf_count = 0;
4275 /* Count up the number of relocations we will output for each output
4276 section, so that we know the sizes of the reloc sections. We
4277 also figure out some maximum sizes. */
4278 max_contents_size = 0;
4279 max_external_reloc_size = 0;
4280 max_internal_reloc_count = 0;
4283 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4287 for (p = o->link_order_head; p != NULL; p = p->next)
4289 if (p->type == bfd_section_reloc_link_order
4290 || p->type == bfd_symbol_reloc_link_order)
4292 else if (p->type == bfd_indirect_link_order)
4296 sec = p->u.indirect.section;
4298 /* Mark all sections which are to be included in the
4299 link. This will normally be every section. We need
4300 to do this so that we can identify any sections which
4301 the linker has decided to not include. */
4302 sec->linker_mark = true;
4304 if (sec->flags & SEC_MERGE)
4307 if (info->relocateable || info->emitrelocations)
4308 o->reloc_count += sec->reloc_count;
4310 if (sec->_raw_size > max_contents_size)
4311 max_contents_size = sec->_raw_size;
4312 if (sec->_cooked_size > max_contents_size)
4313 max_contents_size = sec->_cooked_size;
4315 /* We are interested in just local symbols, not all
4317 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
4318 && (sec->owner->flags & DYNAMIC) == 0)
4322 if (elf_bad_symtab (sec->owner))
4323 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
4324 / sizeof (Elf_External_Sym));
4326 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
4328 if (sym_count > max_sym_count)
4329 max_sym_count = sym_count;
4331 if ((sec->flags & SEC_RELOC) != 0)
4335 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
4336 if (ext_size > max_external_reloc_size)
4337 max_external_reloc_size = ext_size;
4338 if (sec->reloc_count > max_internal_reloc_count)
4339 max_internal_reloc_count = sec->reloc_count;
4345 if (o->reloc_count > 0)
4346 o->flags |= SEC_RELOC;
4349 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4350 set it (this is probably a bug) and if it is set
4351 assign_section_numbers will create a reloc section. */
4352 o->flags &=~ SEC_RELOC;
4355 /* If the SEC_ALLOC flag is not set, force the section VMA to
4356 zero. This is done in elf_fake_sections as well, but forcing
4357 the VMA to 0 here will ensure that relocs against these
4358 sections are handled correctly. */
4359 if ((o->flags & SEC_ALLOC) == 0
4360 && ! o->user_set_vma)
4364 if (! info->relocateable && merged)
4365 elf_link_hash_traverse (elf_hash_table (info),
4366 elf_link_sec_merge_syms, (PTR) abfd);
4368 /* Figure out the file positions for everything but the symbol table
4369 and the relocs. We set symcount to force assign_section_numbers
4370 to create a symbol table. */
4371 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
4372 BFD_ASSERT (! abfd->output_has_begun);
4373 if (! _bfd_elf_compute_section_file_positions (abfd, info))
4376 /* Figure out how many relocations we will have in each section.
4377 Just using RELOC_COUNT isn't good enough since that doesn't
4378 maintain a separate value for REL vs. RELA relocations. */
4379 if (info->relocateable || info->emitrelocations)
4380 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
4381 for (o = sub->sections; o != NULL; o = o->next)
4383 asection *output_section;
4385 if (! o->linker_mark)
4387 /* This section was omitted from the link. */
4391 output_section = o->output_section;
4393 if (output_section != NULL
4394 && (o->flags & SEC_RELOC) != 0)
4396 struct bfd_elf_section_data *esdi
4397 = elf_section_data (o);
4398 struct bfd_elf_section_data *esdo
4399 = elf_section_data (output_section);
4400 unsigned int *rel_count;
4401 unsigned int *rel_count2;
4403 /* We must be careful to add the relocation froms the
4404 input section to the right output count. */
4405 if (esdi->rel_hdr.sh_entsize == esdo->rel_hdr.sh_entsize)
4407 rel_count = &esdo->rel_count;
4408 rel_count2 = &esdo->rel_count2;
4412 rel_count = &esdo->rel_count2;
4413 rel_count2 = &esdo->rel_count;
4416 *rel_count += (esdi->rel_hdr.sh_size
4417 / esdi->rel_hdr.sh_entsize);
4419 *rel_count2 += (esdi->rel_hdr2->sh_size
4420 / esdi->rel_hdr2->sh_entsize);
4424 /* That created the reloc sections. Set their sizes, and assign
4425 them file positions, and allocate some buffers. */
4426 for (o = abfd->sections; o != NULL; o = o->next)
4428 if ((o->flags & SEC_RELOC) != 0)
4430 if (!elf_link_size_reloc_section (abfd,
4431 &elf_section_data (o)->rel_hdr,
4435 if (elf_section_data (o)->rel_hdr2
4436 && !elf_link_size_reloc_section (abfd,
4437 elf_section_data (o)->rel_hdr2,
4442 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4443 to count upwards while actually outputting the relocations. */
4444 elf_section_data (o)->rel_count = 0;
4445 elf_section_data (o)->rel_count2 = 0;
4448 _bfd_elf_assign_file_positions_for_relocs (abfd);
4450 /* We have now assigned file positions for all the sections except
4451 .symtab and .strtab. We start the .symtab section at the current
4452 file position, and write directly to it. We build the .strtab
4453 section in memory. */
4454 bfd_get_symcount (abfd) = 0;
4455 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4456 /* sh_name is set in prep_headers. */
4457 symtab_hdr->sh_type = SHT_SYMTAB;
4458 symtab_hdr->sh_flags = 0;
4459 symtab_hdr->sh_addr = 0;
4460 symtab_hdr->sh_size = 0;
4461 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
4462 /* sh_link is set in assign_section_numbers. */
4463 /* sh_info is set below. */
4464 /* sh_offset is set just below. */
4465 symtab_hdr->sh_addralign = bed->s->file_align;
4467 off = elf_tdata (abfd)->next_file_pos;
4468 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
4470 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4471 incorrect. We do not yet know the size of the .symtab section.
4472 We correct next_file_pos below, after we do know the size. */
4474 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4475 continuously seeking to the right position in the file. */
4476 if (! info->keep_memory || max_sym_count < 20)
4477 finfo.symbuf_size = 20;
4479 finfo.symbuf_size = max_sym_count;
4480 finfo.symbuf = ((Elf_External_Sym *)
4481 bfd_malloc (finfo.symbuf_size * sizeof (Elf_External_Sym)));
4482 if (finfo.symbuf == NULL)
4485 /* Start writing out the symbol table. The first symbol is always a
4487 if (info->strip != strip_all || info->relocateable || info->emitrelocations)
4489 elfsym.st_value = 0;
4492 elfsym.st_other = 0;
4493 elfsym.st_shndx = SHN_UNDEF;
4494 if (! elf_link_output_sym (&finfo, (const char *) NULL,
4495 &elfsym, bfd_und_section_ptr))
4500 /* Some standard ELF linkers do this, but we don't because it causes
4501 bootstrap comparison failures. */
4502 /* Output a file symbol for the output file as the second symbol.
4503 We output this even if we are discarding local symbols, although
4504 I'm not sure if this is correct. */
4505 elfsym.st_value = 0;
4507 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
4508 elfsym.st_other = 0;
4509 elfsym.st_shndx = SHN_ABS;
4510 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
4511 &elfsym, bfd_abs_section_ptr))
4515 /* Output a symbol for each section. We output these even if we are
4516 discarding local symbols, since they are used for relocs. These
4517 symbols have no names. We store the index of each one in the
4518 index field of the section, so that we can find it again when
4519 outputting relocs. */
4520 if (info->strip != strip_all || info->relocateable || info->emitrelocations)
4523 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
4524 elfsym.st_other = 0;
4525 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
4527 o = section_from_elf_index (abfd, i);
4529 o->target_index = bfd_get_symcount (abfd);
4530 elfsym.st_shndx = i;
4531 if (info->relocateable || o == NULL)
4532 elfsym.st_value = 0;
4534 elfsym.st_value = o->vma;
4535 if (! elf_link_output_sym (&finfo, (const char *) NULL,
4541 /* Allocate some memory to hold information read in from the input
4543 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
4544 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
4545 finfo.internal_relocs = ((Elf_Internal_Rela *)
4546 bfd_malloc (max_internal_reloc_count
4547 * sizeof (Elf_Internal_Rela)
4548 * bed->s->int_rels_per_ext_rel));
4549 finfo.external_syms = ((Elf_External_Sym *)
4550 bfd_malloc (max_sym_count
4551 * sizeof (Elf_External_Sym)));
4552 finfo.internal_syms = ((Elf_Internal_Sym *)
4553 bfd_malloc (max_sym_count
4554 * sizeof (Elf_Internal_Sym)));
4555 finfo.indices = (long *) bfd_malloc (max_sym_count * sizeof (long));
4556 finfo.sections = ((asection **)
4557 bfd_malloc (max_sym_count * sizeof (asection *)));
4558 if ((finfo.contents == NULL && max_contents_size != 0)
4559 || (finfo.external_relocs == NULL && max_external_reloc_size != 0)
4560 || (finfo.internal_relocs == NULL && max_internal_reloc_count != 0)
4561 || (finfo.external_syms == NULL && max_sym_count != 0)
4562 || (finfo.internal_syms == NULL && max_sym_count != 0)
4563 || (finfo.indices == NULL && max_sym_count != 0)
4564 || (finfo.sections == NULL && max_sym_count != 0))
4567 /* Since ELF permits relocations to be against local symbols, we
4568 must have the local symbols available when we do the relocations.
4569 Since we would rather only read the local symbols once, and we
4570 would rather not keep them in memory, we handle all the
4571 relocations for a single input file at the same time.
4573 Unfortunately, there is no way to know the total number of local
4574 symbols until we have seen all of them, and the local symbol
4575 indices precede the global symbol indices. This means that when
4576 we are generating relocateable output, and we see a reloc against
4577 a global symbol, we can not know the symbol index until we have
4578 finished examining all the local symbols to see which ones we are
4579 going to output. To deal with this, we keep the relocations in
4580 memory, and don't output them until the end of the link. This is
4581 an unfortunate waste of memory, but I don't see a good way around
4582 it. Fortunately, it only happens when performing a relocateable
4583 link, which is not the common case. FIXME: If keep_memory is set
4584 we could write the relocs out and then read them again; I don't
4585 know how bad the memory loss will be. */
4587 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
4588 sub->output_has_begun = false;
4589 for (o = abfd->sections; o != NULL; o = o->next)
4591 for (p = o->link_order_head; p != NULL; p = p->next)
4593 if (p->type == bfd_indirect_link_order
4594 && (bfd_get_flavour (p->u.indirect.section->owner)
4595 == bfd_target_elf_flavour))
4597 sub = p->u.indirect.section->owner;
4598 if (! sub->output_has_begun)
4600 if (! elf_link_input_bfd (&finfo, sub))
4602 sub->output_has_begun = true;
4605 else if (p->type == bfd_section_reloc_link_order
4606 || p->type == bfd_symbol_reloc_link_order)
4608 if (! elf_reloc_link_order (abfd, info, o, p))
4613 if (! _bfd_default_link_order (abfd, info, o, p))
4619 /* That wrote out all the local symbols. Finish up the symbol table
4620 with the global symbols. Even if we want to strip everything we
4621 can, we still need to deal with those global symbols that got
4622 converted to local in a version script. */
4626 /* Output any global symbols that got converted to local in a
4627 version script. We do this in a separate step since ELF
4628 requires all local symbols to appear prior to any global
4629 symbols. FIXME: We should only do this if some global
4630 symbols were, in fact, converted to become local. FIXME:
4631 Will this work correctly with the Irix 5 linker? */
4632 eoinfo.failed = false;
4633 eoinfo.finfo = &finfo;
4634 eoinfo.localsyms = true;
4635 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
4641 /* The sh_info field records the index of the first non local symbol. */
4642 symtab_hdr->sh_info = bfd_get_symcount (abfd);
4645 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
4647 Elf_Internal_Sym sym;
4648 Elf_External_Sym *dynsym =
4649 (Elf_External_Sym *)finfo.dynsym_sec->contents;
4650 long last_local = 0;
4652 /* Write out the section symbols for the output sections. */
4659 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
4662 for (s = abfd->sections; s != NULL; s = s->next)
4665 indx = elf_section_data (s)->this_idx;
4666 BFD_ASSERT (indx > 0);
4667 sym.st_shndx = indx;
4668 sym.st_value = s->vma;
4670 elf_swap_symbol_out (abfd, &sym,
4671 dynsym + elf_section_data (s)->dynindx);
4674 last_local = bfd_count_sections (abfd);
4677 /* Write out the local dynsyms. */
4678 if (elf_hash_table (info)->dynlocal)
4680 struct elf_link_local_dynamic_entry *e;
4681 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
4685 sym.st_size = e->isym.st_size;
4686 sym.st_other = e->isym.st_other;
4688 /* Copy the internal symbol as is.
4689 Note that we saved a word of storage and overwrote
4690 the original st_name with the dynstr_index. */
4693 if (e->isym.st_shndx > 0 && e->isym.st_shndx < SHN_LORESERVE)
4695 s = bfd_section_from_elf_index (e->input_bfd,
4699 elf_section_data (s->output_section)->this_idx;
4700 sym.st_value = (s->output_section->vma
4702 + e->isym.st_value);
4705 if (last_local < e->dynindx)
4706 last_local = e->dynindx;
4708 elf_swap_symbol_out (abfd, &sym, dynsym + e->dynindx);
4712 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
4716 /* We get the global symbols from the hash table. */
4717 eoinfo.failed = false;
4718 eoinfo.localsyms = false;
4719 eoinfo.finfo = &finfo;
4720 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
4725 /* If backend needs to output some symbols not present in the hash
4726 table, do it now. */
4727 if (bed->elf_backend_output_arch_syms)
4729 if (! (*bed->elf_backend_output_arch_syms)
4730 (abfd, info, (PTR) &finfo,
4731 (boolean (*) PARAMS ((PTR, const char *,
4732 Elf_Internal_Sym *, asection *)))
4733 elf_link_output_sym))
4737 /* Flush all symbols to the file. */
4738 if (! elf_link_flush_output_syms (&finfo))
4741 /* Now we know the size of the symtab section. */
4742 off += symtab_hdr->sh_size;
4744 /* Finish up and write out the symbol string table (.strtab)
4746 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
4747 /* sh_name was set in prep_headers. */
4748 symstrtab_hdr->sh_type = SHT_STRTAB;
4749 symstrtab_hdr->sh_flags = 0;
4750 symstrtab_hdr->sh_addr = 0;
4751 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
4752 symstrtab_hdr->sh_entsize = 0;
4753 symstrtab_hdr->sh_link = 0;
4754 symstrtab_hdr->sh_info = 0;
4755 /* sh_offset is set just below. */
4756 symstrtab_hdr->sh_addralign = 1;
4758 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
4759 elf_tdata (abfd)->next_file_pos = off;
4761 if (bfd_get_symcount (abfd) > 0)
4763 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
4764 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
4768 /* Adjust the relocs to have the correct symbol indices. */
4769 for (o = abfd->sections; o != NULL; o = o->next)
4771 if ((o->flags & SEC_RELOC) == 0)
4774 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
4775 elf_section_data (o)->rel_count,
4776 elf_section_data (o)->rel_hashes);
4777 if (elf_section_data (o)->rel_hdr2 != NULL)
4778 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
4779 elf_section_data (o)->rel_count2,
4780 (elf_section_data (o)->rel_hashes
4781 + elf_section_data (o)->rel_count));
4783 /* Set the reloc_count field to 0 to prevent write_relocs from
4784 trying to swap the relocs out itself. */
4788 /* If we are linking against a dynamic object, or generating a
4789 shared library, finish up the dynamic linking information. */
4792 Elf_External_Dyn *dyncon, *dynconend;
4794 /* Fix up .dynamic entries. */
4795 o = bfd_get_section_by_name (dynobj, ".dynamic");
4796 BFD_ASSERT (o != NULL);
4798 dyncon = (Elf_External_Dyn *) o->contents;
4799 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
4800 for (; dyncon < dynconend; dyncon++)
4802 Elf_Internal_Dyn dyn;
4806 elf_swap_dyn_in (dynobj, dyncon, &dyn);
4813 name = info->init_function;
4816 name = info->fini_function;
4819 struct elf_link_hash_entry *h;
4821 h = elf_link_hash_lookup (elf_hash_table (info), name,
4822 false, false, true);
4824 && (h->root.type == bfd_link_hash_defined
4825 || h->root.type == bfd_link_hash_defweak))
4827 dyn.d_un.d_val = h->root.u.def.value;
4828 o = h->root.u.def.section;
4829 if (o->output_section != NULL)
4830 dyn.d_un.d_val += (o->output_section->vma
4831 + o->output_offset);
4834 /* The symbol is imported from another shared
4835 library and does not apply to this one. */
4839 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4854 name = ".gnu.version_d";
4857 name = ".gnu.version_r";
4860 name = ".gnu.version";
4862 o = bfd_get_section_by_name (abfd, name);
4863 BFD_ASSERT (o != NULL);
4864 dyn.d_un.d_ptr = o->vma;
4865 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4872 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
4877 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
4879 Elf_Internal_Shdr *hdr;
4881 hdr = elf_elfsections (abfd)[i];
4882 if (hdr->sh_type == type
4883 && (hdr->sh_flags & SHF_ALLOC) != 0)
4885 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
4886 dyn.d_un.d_val += hdr->sh_size;
4889 if (dyn.d_un.d_val == 0
4890 || hdr->sh_addr < dyn.d_un.d_val)
4891 dyn.d_un.d_val = hdr->sh_addr;
4895 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4901 /* If we have created any dynamic sections, then output them. */
4904 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
4907 for (o = dynobj->sections; o != NULL; o = o->next)
4909 if ((o->flags & SEC_HAS_CONTENTS) == 0
4910 || o->_raw_size == 0
4911 || o->output_section == bfd_abs_section_ptr)
4913 if ((o->flags & SEC_LINKER_CREATED) == 0)
4915 /* At this point, we are only interested in sections
4916 created by elf_link_create_dynamic_sections. */
4919 if ((elf_section_data (o->output_section)->this_hdr.sh_type
4921 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
4923 if (! bfd_set_section_contents (abfd, o->output_section,
4924 o->contents, o->output_offset,
4932 /* The contents of the .dynstr section are actually in a
4934 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
4935 if (bfd_seek (abfd, off, SEEK_SET) != 0
4936 || ! _bfd_stringtab_emit (abfd,
4937 elf_hash_table (info)->dynstr))
4943 /* If we have optimized stabs strings, output them. */
4944 if (elf_hash_table (info)->stab_info != NULL)
4946 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
4950 if (finfo.symstrtab != NULL)
4951 _bfd_stringtab_free (finfo.symstrtab);
4952 if (finfo.contents != NULL)
4953 free (finfo.contents);
4954 if (finfo.external_relocs != NULL)
4955 free (finfo.external_relocs);
4956 if (finfo.internal_relocs != NULL)
4957 free (finfo.internal_relocs);
4958 if (finfo.external_syms != NULL)
4959 free (finfo.external_syms);
4960 if (finfo.internal_syms != NULL)
4961 free (finfo.internal_syms);
4962 if (finfo.indices != NULL)
4963 free (finfo.indices);
4964 if (finfo.sections != NULL)
4965 free (finfo.sections);
4966 if (finfo.symbuf != NULL)
4967 free (finfo.symbuf);
4968 for (o = abfd->sections; o != NULL; o = o->next)
4970 if ((o->flags & SEC_RELOC) != 0
4971 && elf_section_data (o)->rel_hashes != NULL)
4972 free (elf_section_data (o)->rel_hashes);
4975 elf_tdata (abfd)->linker = true;
4980 if (finfo.symstrtab != NULL)
4981 _bfd_stringtab_free (finfo.symstrtab);
4982 if (finfo.contents != NULL)
4983 free (finfo.contents);
4984 if (finfo.external_relocs != NULL)
4985 free (finfo.external_relocs);
4986 if (finfo.internal_relocs != NULL)
4987 free (finfo.internal_relocs);
4988 if (finfo.external_syms != NULL)
4989 free (finfo.external_syms);
4990 if (finfo.internal_syms != NULL)
4991 free (finfo.internal_syms);
4992 if (finfo.indices != NULL)
4993 free (finfo.indices);
4994 if (finfo.sections != NULL)
4995 free (finfo.sections);
4996 if (finfo.symbuf != NULL)
4997 free (finfo.symbuf);
4998 for (o = abfd->sections; o != NULL; o = o->next)
5000 if ((o->flags & SEC_RELOC) != 0
5001 && elf_section_data (o)->rel_hashes != NULL)
5002 free (elf_section_data (o)->rel_hashes);
5008 /* Add a symbol to the output symbol table. */
5011 elf_link_output_sym (finfo, name, elfsym, input_sec)
5012 struct elf_final_link_info *finfo;
5014 Elf_Internal_Sym *elfsym;
5015 asection *input_sec;
5017 boolean (*output_symbol_hook) PARAMS ((bfd *,
5018 struct bfd_link_info *info,
5023 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
5024 elf_backend_link_output_symbol_hook;
5025 if (output_symbol_hook != NULL)
5027 if (! ((*output_symbol_hook)
5028 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
5032 if (name == (const char *) NULL || *name == '\0')
5033 elfsym->st_name = 0;
5034 else if (input_sec->flags & SEC_EXCLUDE)
5035 elfsym->st_name = 0;
5038 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
5041 if (elfsym->st_name == (unsigned long) -1)
5045 if (finfo->symbuf_count >= finfo->symbuf_size)
5047 if (! elf_link_flush_output_syms (finfo))
5051 elf_swap_symbol_out (finfo->output_bfd, elfsym,
5052 (PTR) (finfo->symbuf + finfo->symbuf_count));
5053 ++finfo->symbuf_count;
5055 ++ bfd_get_symcount (finfo->output_bfd);
5060 /* Flush the output symbols to the file. */
5063 elf_link_flush_output_syms (finfo)
5064 struct elf_final_link_info *finfo;
5066 if (finfo->symbuf_count > 0)
5068 Elf_Internal_Shdr *symtab;
5070 symtab = &elf_tdata (finfo->output_bfd)->symtab_hdr;
5072 if (bfd_seek (finfo->output_bfd, symtab->sh_offset + symtab->sh_size,
5074 || (bfd_write ((PTR) finfo->symbuf, finfo->symbuf_count,
5075 sizeof (Elf_External_Sym), finfo->output_bfd)
5076 != finfo->symbuf_count * sizeof (Elf_External_Sym)))
5079 symtab->sh_size += finfo->symbuf_count * sizeof (Elf_External_Sym);
5081 finfo->symbuf_count = 0;
5087 /* Adjust all external symbols pointing into SEC_MERGE sections
5088 to reflect the object merging within the sections. */
5091 elf_link_sec_merge_syms (h, data)
5092 struct elf_link_hash_entry *h;
5097 if ((h->root.type == bfd_link_hash_defined
5098 || h->root.type == bfd_link_hash_defweak)
5099 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
5100 && elf_section_data (sec)->merge_info)
5102 bfd *output_bfd = (bfd *) data;
5104 h->root.u.def.value =
5105 _bfd_merged_section_offset (output_bfd,
5106 &h->root.u.def.section,
5107 elf_section_data (sec)->merge_info,
5108 h->root.u.def.value, (bfd_vma) 0);
5114 /* Add an external symbol to the symbol table. This is called from
5115 the hash table traversal routine. When generating a shared object,
5116 we go through the symbol table twice. The first time we output
5117 anything that might have been forced to local scope in a version
5118 script. The second time we output the symbols that are still
5122 elf_link_output_extsym (h, data)
5123 struct elf_link_hash_entry *h;
5126 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
5127 struct elf_final_link_info *finfo = eoinfo->finfo;
5129 Elf_Internal_Sym sym;
5130 asection *input_sec;
5132 /* Decide whether to output this symbol in this pass. */
5133 if (eoinfo->localsyms)
5135 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5140 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5144 /* If we are not creating a shared library, and this symbol is
5145 referenced by a shared library but is not defined anywhere, then
5146 warn that it is undefined. If we do not do this, the runtime
5147 linker will complain that the symbol is undefined when the
5148 program is run. We don't have to worry about symbols that are
5149 referenced by regular files, because we will already have issued
5150 warnings for them. */
5151 if (! finfo->info->relocateable
5152 && ! finfo->info->allow_shlib_undefined
5153 && ! (finfo->info->shared
5154 && !finfo->info->no_undefined)
5155 && h->root.type == bfd_link_hash_undefined
5156 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
5157 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
5159 if (! ((*finfo->info->callbacks->undefined_symbol)
5160 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
5161 (asection *) NULL, 0, true)))
5163 eoinfo->failed = true;
5168 /* We don't want to output symbols that have never been mentioned by
5169 a regular file, or that we have been told to strip. However, if
5170 h->indx is set to -2, the symbol is used by a reloc and we must
5174 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
5175 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
5176 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
5177 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
5179 else if (finfo->info->strip == strip_all
5180 || (finfo->info->strip == strip_some
5181 && bfd_hash_lookup (finfo->info->keep_hash,
5182 h->root.root.string,
5183 false, false) == NULL))
5188 /* If we're stripping it, and it's not a dynamic symbol, there's
5189 nothing else to do unless it is a forced local symbol. */
5192 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5196 sym.st_size = h->size;
5197 sym.st_other = h->other;
5198 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5199 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
5200 else if (h->root.type == bfd_link_hash_undefweak
5201 || h->root.type == bfd_link_hash_defweak)
5202 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
5204 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
5206 switch (h->root.type)
5209 case bfd_link_hash_new:
5213 case bfd_link_hash_undefined:
5214 input_sec = bfd_und_section_ptr;
5215 sym.st_shndx = SHN_UNDEF;
5218 case bfd_link_hash_undefweak:
5219 input_sec = bfd_und_section_ptr;
5220 sym.st_shndx = SHN_UNDEF;
5223 case bfd_link_hash_defined:
5224 case bfd_link_hash_defweak:
5226 input_sec = h->root.u.def.section;
5227 if (input_sec->output_section != NULL)
5230 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
5231 input_sec->output_section);
5232 if (sym.st_shndx == (unsigned short) -1)
5234 (*_bfd_error_handler)
5235 (_("%s: could not find output section %s for input section %s"),
5236 bfd_get_filename (finfo->output_bfd),
5237 input_sec->output_section->name,
5239 eoinfo->failed = true;
5243 /* ELF symbols in relocateable files are section relative,
5244 but in nonrelocateable files they are virtual
5246 sym.st_value = h->root.u.def.value + input_sec->output_offset;
5247 if (! finfo->info->relocateable)
5248 sym.st_value += input_sec->output_section->vma;
5252 BFD_ASSERT (input_sec->owner == NULL
5253 || (input_sec->owner->flags & DYNAMIC) != 0);
5254 sym.st_shndx = SHN_UNDEF;
5255 input_sec = bfd_und_section_ptr;
5260 case bfd_link_hash_common:
5261 input_sec = h->root.u.c.p->section;
5262 sym.st_shndx = SHN_COMMON;
5263 sym.st_value = 1 << h->root.u.c.p->alignment_power;
5266 case bfd_link_hash_indirect:
5267 /* These symbols are created by symbol versioning. They point
5268 to the decorated version of the name. For example, if the
5269 symbol foo@@GNU_1.2 is the default, which should be used when
5270 foo is used with no version, then we add an indirect symbol
5271 foo which points to foo@@GNU_1.2. We ignore these symbols,
5272 since the indirected symbol is already in the hash table. */
5275 case bfd_link_hash_warning:
5276 /* We can't represent these symbols in ELF, although a warning
5277 symbol may have come from a .gnu.warning.SYMBOL section. We
5278 just put the target symbol in the hash table. If the target
5279 symbol does not really exist, don't do anything. */
5280 if (h->root.u.i.link->type == bfd_link_hash_new)
5282 return (elf_link_output_extsym
5283 ((struct elf_link_hash_entry *) h->root.u.i.link, data));
5286 /* Give the processor backend a chance to tweak the symbol value,
5287 and also to finish up anything that needs to be done for this
5289 if ((h->dynindx != -1
5290 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5291 && elf_hash_table (finfo->info)->dynamic_sections_created)
5293 struct elf_backend_data *bed;
5295 bed = get_elf_backend_data (finfo->output_bfd);
5296 if (! ((*bed->elf_backend_finish_dynamic_symbol)
5297 (finfo->output_bfd, finfo->info, h, &sym)))
5299 eoinfo->failed = true;
5304 /* If we are marking the symbol as undefined, and there are no
5305 non-weak references to this symbol from a regular object, then
5306 mark the symbol as weak undefined; if there are non-weak
5307 references, mark the symbol as strong. We can't do this earlier,
5308 because it might not be marked as undefined until the
5309 finish_dynamic_symbol routine gets through with it. */
5310 if (sym.st_shndx == SHN_UNDEF
5311 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
5312 && (ELF_ST_BIND(sym.st_info) == STB_GLOBAL
5313 || ELF_ST_BIND(sym.st_info) == STB_WEAK))
5317 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
5318 bindtype = STB_GLOBAL;
5320 bindtype = STB_WEAK;
5321 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
5324 /* If a symbol is not defined locally, we clear the visibility
5326 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
5327 sym.st_other ^= ELF_ST_VISIBILITY(sym.st_other);
5329 /* If this symbol should be put in the .dynsym section, then put it
5330 there now. We have already know the symbol index. We also fill
5331 in the entry in the .hash section. */
5332 if (h->dynindx != -1
5333 && elf_hash_table (finfo->info)->dynamic_sections_created)
5337 size_t hash_entry_size;
5338 bfd_byte *bucketpos;
5341 sym.st_name = h->dynstr_index;
5343 elf_swap_symbol_out (finfo->output_bfd, &sym,
5344 (PTR) (((Elf_External_Sym *)
5345 finfo->dynsym_sec->contents)
5348 bucketcount = elf_hash_table (finfo->info)->bucketcount;
5349 bucket = h->elf_hash_value % bucketcount;
5351 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
5352 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
5353 + (bucket + 2) * hash_entry_size);
5354 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
5355 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
5356 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
5357 ((bfd_byte *) finfo->hash_sec->contents
5358 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
5360 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
5362 Elf_Internal_Versym iversym;
5364 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
5366 if (h->verinfo.verdef == NULL)
5367 iversym.vs_vers = 0;
5369 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
5373 if (h->verinfo.vertree == NULL)
5374 iversym.vs_vers = 1;
5376 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
5379 if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
5380 iversym.vs_vers |= VERSYM_HIDDEN;
5382 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym,
5383 (((Elf_External_Versym *)
5384 finfo->symver_sec->contents)
5389 /* If we're stripping it, then it was just a dynamic symbol, and
5390 there's nothing else to do. */
5394 h->indx = bfd_get_symcount (finfo->output_bfd);
5396 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
5398 eoinfo->failed = true;
5405 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5406 originated from the section given by INPUT_REL_HDR) to the
5410 elf_link_output_relocs (output_bfd, input_section, input_rel_hdr,
5413 asection *input_section;
5414 Elf_Internal_Shdr *input_rel_hdr;
5415 Elf_Internal_Rela *internal_relocs;
5417 Elf_Internal_Rela *irela;
5418 Elf_Internal_Rela *irelaend;
5419 Elf_Internal_Shdr *output_rel_hdr;
5420 asection *output_section;
5421 unsigned int *rel_countp = NULL;
5422 struct elf_backend_data *bed;
5424 output_section = input_section->output_section;
5425 output_rel_hdr = NULL;
5427 if (elf_section_data (output_section)->rel_hdr.sh_entsize
5428 == input_rel_hdr->sh_entsize)
5430 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
5431 rel_countp = &elf_section_data (output_section)->rel_count;
5433 else if (elf_section_data (output_section)->rel_hdr2
5434 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
5435 == input_rel_hdr->sh_entsize))
5437 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
5438 rel_countp = &elf_section_data (output_section)->rel_count2;
5441 BFD_ASSERT (output_rel_hdr != NULL);
5443 bed = get_elf_backend_data (output_bfd);
5444 irela = internal_relocs;
5445 irelaend = irela + input_rel_hdr->sh_size / input_rel_hdr->sh_entsize;
5446 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
5448 Elf_External_Rel *erel;
5450 erel = ((Elf_External_Rel *) output_rel_hdr->contents + *rel_countp);
5451 for (; irela < irelaend; irela++, erel++)
5453 Elf_Internal_Rel irel;
5455 irel.r_offset = irela->r_offset;
5456 irel.r_info = irela->r_info;
5457 BFD_ASSERT (irela->r_addend == 0);
5458 if (bed->s->swap_reloc_out)
5459 (*bed->s->swap_reloc_out) (output_bfd, &irel, (PTR) erel);
5461 elf_swap_reloc_out (output_bfd, &irel, erel);
5466 Elf_External_Rela *erela;
5468 BFD_ASSERT (input_rel_hdr->sh_entsize
5469 == sizeof (Elf_External_Rela));
5470 erela = ((Elf_External_Rela *) output_rel_hdr->contents + *rel_countp);
5471 for (; irela < irelaend; irela++, erela++)
5472 if (bed->s->swap_reloca_out)
5473 (*bed->s->swap_reloca_out) (output_bfd, irela, (PTR) erela);
5475 elf_swap_reloca_out (output_bfd, irela, erela);
5478 /* Bump the counter, so that we know where to add the next set of
5480 *rel_countp += input_rel_hdr->sh_size / input_rel_hdr->sh_entsize;
5483 /* Link an input file into the linker output file. This function
5484 handles all the sections and relocations of the input file at once.
5485 This is so that we only have to read the local symbols once, and
5486 don't have to keep them in memory. */
5489 elf_link_input_bfd (finfo, input_bfd)
5490 struct elf_final_link_info *finfo;
5493 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
5494 bfd *, asection *, bfd_byte *,
5495 Elf_Internal_Rela *,
5496 Elf_Internal_Sym *, asection **));
5498 Elf_Internal_Shdr *symtab_hdr;
5501 Elf_External_Sym *external_syms;
5502 Elf_External_Sym *esym;
5503 Elf_External_Sym *esymend;
5504 Elf_Internal_Sym *isym;
5506 asection **ppsection;
5508 struct elf_backend_data *bed;
5510 output_bfd = finfo->output_bfd;
5511 bed = get_elf_backend_data (output_bfd);
5512 relocate_section = bed->elf_backend_relocate_section;
5514 /* If this is a dynamic object, we don't want to do anything here:
5515 we don't want the local symbols, and we don't want the section
5517 if ((input_bfd->flags & DYNAMIC) != 0)
5520 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5521 if (elf_bad_symtab (input_bfd))
5523 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
5528 locsymcount = symtab_hdr->sh_info;
5529 extsymoff = symtab_hdr->sh_info;
5532 /* Read the local symbols. */
5533 if (symtab_hdr->contents != NULL)
5534 external_syms = (Elf_External_Sym *) symtab_hdr->contents;
5535 else if (locsymcount == 0)
5536 external_syms = NULL;
5539 external_syms = finfo->external_syms;
5540 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
5541 || (bfd_read (external_syms, sizeof (Elf_External_Sym),
5542 locsymcount, input_bfd)
5543 != locsymcount * sizeof (Elf_External_Sym)))
5547 /* Swap in the local symbols and write out the ones which we know
5548 are going into the output file. */
5549 esym = external_syms;
5550 esymend = esym + locsymcount;
5551 isym = finfo->internal_syms;
5552 pindex = finfo->indices;
5553 ppsection = finfo->sections;
5554 for (; esym < esymend; esym++, isym++, pindex++, ppsection++)
5558 Elf_Internal_Sym osym;
5560 elf_swap_symbol_in (input_bfd, esym, isym);
5563 if (elf_bad_symtab (input_bfd))
5565 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
5573 if (isym->st_shndx == SHN_UNDEF)
5575 isec = bfd_und_section_ptr;
5578 else if (isym->st_shndx > 0 && isym->st_shndx < SHN_LORESERVE)
5580 isec = section_from_elf_index (input_bfd, isym->st_shndx);
5581 if (isec && elf_section_data (isec)->merge_info
5582 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
5584 _bfd_merged_section_offset (output_bfd, &isec,
5585 elf_section_data (isec)->merge_info,
5586 isym->st_value, (bfd_vma) 0);
5588 else if (isym->st_shndx == SHN_ABS)
5590 isec = bfd_abs_section_ptr;
5593 else if (isym->st_shndx == SHN_COMMON)
5595 isec = bfd_com_section_ptr;
5606 /* Don't output the first, undefined, symbol. */
5607 if (esym == external_syms)
5610 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
5614 /* Save away all section symbol values. */
5619 if (isec->symbol->value != isym->st_value)
5620 (*_bfd_error_handler)
5621 (_("%s: invalid section symbol index 0x%x (%s) ingored"),
5622 bfd_get_filename (input_bfd), isym->st_shndx,
5626 isec->symbol->value = isym->st_value;
5629 /* If this is a discarded link-once section symbol, update
5630 it's value to that of the kept section symbol. The
5631 linker will keep the first of any matching link-once
5632 sections, so we should have already seen it's section
5633 symbol. I trust no-one will have the bright idea of
5634 re-ordering the bfd list... */
5636 && (bfd_get_section_flags (input_bfd, isec) & SEC_LINK_ONCE) != 0
5637 && (ksec = isec->kept_section) != NULL)
5639 isym->st_value = ksec->symbol->value;
5641 /* That put the value right, but the section info is all
5642 wrong. I hope this works. */
5643 isec->output_offset = ksec->output_offset;
5644 isec->output_section = ksec->output_section;
5647 /* We never output section symbols. Instead, we use the
5648 section symbol of the corresponding section in the output
5653 /* If we are stripping all symbols, we don't want to output this
5655 if (finfo->info->strip == strip_all)
5658 /* If we are discarding all local symbols, we don't want to
5659 output this one. If we are generating a relocateable output
5660 file, then some of the local symbols may be required by
5661 relocs; we output them below as we discover that they are
5663 if (finfo->info->discard == discard_all)
5666 /* If this symbol is defined in a section which we are
5667 discarding, we don't need to keep it, but note that
5668 linker_mark is only reliable for sections that have contents.
5669 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5670 as well as linker_mark. */
5671 if (isym->st_shndx > 0
5672 && isym->st_shndx < SHN_LORESERVE
5674 && ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
5675 || (! finfo->info->relocateable
5676 && (isec->flags & SEC_EXCLUDE) != 0)))
5679 /* Get the name of the symbol. */
5680 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
5685 /* See if we are discarding symbols with this name. */
5686 if ((finfo->info->strip == strip_some
5687 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
5689 || (((finfo->info->discard == discard_sec_merge
5690 && (isec->flags & SEC_MERGE) && ! finfo->info->relocateable)
5691 || finfo->info->discard == discard_l)
5692 && bfd_is_local_label_name (input_bfd, name)))
5695 /* If we get here, we are going to output this symbol. */
5699 /* Adjust the section index for the output file. */
5700 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
5701 isec->output_section);
5702 if (osym.st_shndx == (unsigned short) -1)
5705 *pindex = bfd_get_symcount (output_bfd);
5707 /* ELF symbols in relocateable files are section relative, but
5708 in executable files they are virtual addresses. Note that
5709 this code assumes that all ELF sections have an associated
5710 BFD section with a reasonable value for output_offset; below
5711 we assume that they also have a reasonable value for
5712 output_section. Any special sections must be set up to meet
5713 these requirements. */
5714 osym.st_value += isec->output_offset;
5715 if (! finfo->info->relocateable)
5716 osym.st_value += isec->output_section->vma;
5718 if (! elf_link_output_sym (finfo, name, &osym, isec))
5722 /* Relocate the contents of each section. */
5723 for (o = input_bfd->sections; o != NULL; o = o->next)
5727 if (! o->linker_mark)
5729 /* This section was omitted from the link. */
5733 if ((o->flags & SEC_HAS_CONTENTS) == 0
5734 || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
5737 if ((o->flags & SEC_LINKER_CREATED) != 0)
5739 /* Section was created by elf_link_create_dynamic_sections
5744 /* Get the contents of the section. They have been cached by a
5745 relaxation routine. Note that o is a section in an input
5746 file, so the contents field will not have been set by any of
5747 the routines which work on output files. */
5748 if (elf_section_data (o)->this_hdr.contents != NULL)
5749 contents = elf_section_data (o)->this_hdr.contents;
5752 contents = finfo->contents;
5753 if (! bfd_get_section_contents (input_bfd, o, contents,
5754 (file_ptr) 0, o->_raw_size))
5758 if ((o->flags & SEC_RELOC) != 0)
5760 Elf_Internal_Rela *internal_relocs;
5762 /* Get the swapped relocs. */
5763 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
5764 (input_bfd, o, finfo->external_relocs,
5765 finfo->internal_relocs, false));
5766 if (internal_relocs == NULL
5767 && o->reloc_count > 0)
5770 /* Relocate the section by invoking a back end routine.
5772 The back end routine is responsible for adjusting the
5773 section contents as necessary, and (if using Rela relocs
5774 and generating a relocateable output file) adjusting the
5775 reloc addend as necessary.
5777 The back end routine does not have to worry about setting
5778 the reloc address or the reloc symbol index.
5780 The back end routine is given a pointer to the swapped in
5781 internal symbols, and can access the hash table entries
5782 for the external symbols via elf_sym_hashes (input_bfd).
5784 When generating relocateable output, the back end routine
5785 must handle STB_LOCAL/STT_SECTION symbols specially. The
5786 output symbol is going to be a section symbol
5787 corresponding to the output section, which will require
5788 the addend to be adjusted. */
5790 if (! (*relocate_section) (output_bfd, finfo->info,
5791 input_bfd, o, contents,
5793 finfo->internal_syms,
5797 if (finfo->info->relocateable || finfo->info->emitrelocations)
5799 Elf_Internal_Rela *irela;
5800 Elf_Internal_Rela *irelaend;
5801 struct elf_link_hash_entry **rel_hash;
5802 Elf_Internal_Shdr *input_rel_hdr;
5804 /* Adjust the reloc addresses and symbol indices. */
5806 irela = internal_relocs;
5808 irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
5809 rel_hash = (elf_section_data (o->output_section)->rel_hashes
5810 + elf_section_data (o->output_section)->rel_count
5811 + elf_section_data (o->output_section)->rel_count2);
5812 for (; irela < irelaend; irela++, rel_hash++)
5814 unsigned long r_symndx;
5815 Elf_Internal_Sym *isym;
5818 irela->r_offset += o->output_offset;
5820 /* Relocs in an executable have to be virtual addresses. */
5821 if (finfo->info->emitrelocations)
5822 irela->r_offset += o->output_section->vma;
5824 r_symndx = ELF_R_SYM (irela->r_info);
5829 if (r_symndx >= locsymcount
5830 || (elf_bad_symtab (input_bfd)
5831 && finfo->sections[r_symndx] == NULL))
5833 struct elf_link_hash_entry *rh;
5836 /* This is a reloc against a global symbol. We
5837 have not yet output all the local symbols, so
5838 we do not know the symbol index of any global
5839 symbol. We set the rel_hash entry for this
5840 reloc to point to the global hash table entry
5841 for this symbol. The symbol index is then
5842 set at the end of elf_bfd_final_link. */
5843 indx = r_symndx - extsymoff;
5844 rh = elf_sym_hashes (input_bfd)[indx];
5845 while (rh->root.type == bfd_link_hash_indirect
5846 || rh->root.type == bfd_link_hash_warning)
5847 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
5849 /* Setting the index to -2 tells
5850 elf_link_output_extsym that this symbol is
5852 BFD_ASSERT (rh->indx < 0);
5860 /* This is a reloc against a local symbol. */
5863 isym = finfo->internal_syms + r_symndx;
5864 sec = finfo->sections[r_symndx];
5865 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
5867 /* I suppose the backend ought to fill in the
5868 section of any STT_SECTION symbol against a
5869 processor specific section. If we have
5870 discarded a section, the output_section will
5871 be the absolute section. */
5873 && (bfd_is_abs_section (sec)
5874 || (sec->output_section != NULL
5875 && bfd_is_abs_section (sec->output_section))))
5877 else if (sec == NULL || sec->owner == NULL)
5879 bfd_set_error (bfd_error_bad_value);
5884 r_symndx = sec->output_section->target_index;
5885 BFD_ASSERT (r_symndx != 0);
5890 if (finfo->indices[r_symndx] == -1)
5896 if (finfo->info->strip == strip_all)
5898 /* You can't do ld -r -s. */
5899 bfd_set_error (bfd_error_invalid_operation);
5903 /* This symbol was skipped earlier, but
5904 since it is needed by a reloc, we
5905 must output it now. */
5906 link = symtab_hdr->sh_link;
5907 name = bfd_elf_string_from_elf_section (input_bfd,
5913 osec = sec->output_section;
5915 _bfd_elf_section_from_bfd_section (output_bfd,
5917 if (isym->st_shndx == (unsigned short) -1)
5920 isym->st_value += sec->output_offset;
5921 if (! finfo->info->relocateable)
5922 isym->st_value += osec->vma;
5924 finfo->indices[r_symndx] = bfd_get_symcount (output_bfd);
5926 if (! elf_link_output_sym (finfo, name, isym, sec))
5930 r_symndx = finfo->indices[r_symndx];
5933 irela->r_info = ELF_R_INFO (r_symndx,
5934 ELF_R_TYPE (irela->r_info));
5937 /* Swap out the relocs. */
5938 input_rel_hdr = &elf_section_data (o)->rel_hdr;
5939 elf_link_output_relocs (output_bfd, o,
5943 += input_rel_hdr->sh_size / input_rel_hdr->sh_entsize;
5944 input_rel_hdr = elf_section_data (o)->rel_hdr2;
5946 elf_link_output_relocs (output_bfd, o,
5952 /* Write out the modified section contents. */
5953 if (elf_section_data (o)->stab_info)
5955 if (! (_bfd_write_section_stabs
5956 (output_bfd, &elf_hash_table (finfo->info)->stab_info,
5957 o, &elf_section_data (o)->stab_info, contents)))
5960 else if (elf_section_data (o)->merge_info)
5962 if (! (_bfd_write_merged_section
5963 (output_bfd, o, elf_section_data (o)->merge_info)))
5968 if (! (o->flags & SEC_EXCLUDE) &&
5969 ! bfd_set_section_contents (output_bfd, o->output_section,
5970 contents, o->output_offset,
5971 (o->_cooked_size != 0
5981 /* Generate a reloc when linking an ELF file. This is a reloc
5982 requested by the linker, and does come from any input file. This
5983 is used to build constructor and destructor tables when linking
5987 elf_reloc_link_order (output_bfd, info, output_section, link_order)
5989 struct bfd_link_info *info;
5990 asection *output_section;
5991 struct bfd_link_order *link_order;
5993 reloc_howto_type *howto;
5997 struct elf_link_hash_entry **rel_hash_ptr;
5998 Elf_Internal_Shdr *rel_hdr;
5999 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
6001 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
6004 bfd_set_error (bfd_error_bad_value);
6008 addend = link_order->u.reloc.p->addend;
6010 /* Figure out the symbol index. */
6011 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
6012 + elf_section_data (output_section)->rel_count
6013 + elf_section_data (output_section)->rel_count2);
6014 if (link_order->type == bfd_section_reloc_link_order)
6016 indx = link_order->u.reloc.p->u.section->target_index;
6017 BFD_ASSERT (indx != 0);
6018 *rel_hash_ptr = NULL;
6022 struct elf_link_hash_entry *h;
6024 /* Treat a reloc against a defined symbol as though it were
6025 actually against the section. */
6026 h = ((struct elf_link_hash_entry *)
6027 bfd_wrapped_link_hash_lookup (output_bfd, info,
6028 link_order->u.reloc.p->u.name,
6029 false, false, true));
6031 && (h->root.type == bfd_link_hash_defined
6032 || h->root.type == bfd_link_hash_defweak))
6036 section = h->root.u.def.section;
6037 indx = section->output_section->target_index;
6038 *rel_hash_ptr = NULL;
6039 /* It seems that we ought to add the symbol value to the
6040 addend here, but in practice it has already been added
6041 because it was passed to constructor_callback. */
6042 addend += section->output_section->vma + section->output_offset;
6046 /* Setting the index to -2 tells elf_link_output_extsym that
6047 this symbol is used by a reloc. */
6054 if (! ((*info->callbacks->unattached_reloc)
6055 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
6056 (asection *) NULL, (bfd_vma) 0)))
6062 /* If this is an inplace reloc, we must write the addend into the
6064 if (howto->partial_inplace && addend != 0)
6067 bfd_reloc_status_type rstat;
6071 size = bfd_get_reloc_size (howto);
6072 buf = (bfd_byte *) bfd_zmalloc (size);
6073 if (buf == (bfd_byte *) NULL)
6075 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
6081 case bfd_reloc_outofrange:
6083 case bfd_reloc_overflow:
6084 if (! ((*info->callbacks->reloc_overflow)
6086 (link_order->type == bfd_section_reloc_link_order
6087 ? bfd_section_name (output_bfd,
6088 link_order->u.reloc.p->u.section)
6089 : link_order->u.reloc.p->u.name),
6090 howto->name, addend, (bfd *) NULL, (asection *) NULL,
6098 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
6099 (file_ptr) link_order->offset, size);
6105 /* The address of a reloc is relative to the section in a
6106 relocateable file, and is a virtual address in an executable
6108 offset = link_order->offset;
6109 if (! info->relocateable)
6110 offset += output_section->vma;
6112 rel_hdr = &elf_section_data (output_section)->rel_hdr;
6114 if (rel_hdr->sh_type == SHT_REL)
6116 Elf_Internal_Rel irel;
6117 Elf_External_Rel *erel;
6119 irel.r_offset = offset;
6120 irel.r_info = ELF_R_INFO (indx, howto->type);
6121 erel = ((Elf_External_Rel *) rel_hdr->contents
6122 + elf_section_data (output_section)->rel_count);
6123 if (bed->s->swap_reloc_out)
6124 (*bed->s->swap_reloc_out) (output_bfd, &irel, (bfd_byte *) erel);
6126 elf_swap_reloc_out (output_bfd, &irel, erel);
6130 Elf_Internal_Rela irela;
6131 Elf_External_Rela *erela;
6133 irela.r_offset = offset;
6134 irela.r_info = ELF_R_INFO (indx, howto->type);
6135 irela.r_addend = addend;
6136 erela = ((Elf_External_Rela *) rel_hdr->contents
6137 + elf_section_data (output_section)->rel_count);
6138 if (bed->s->swap_reloca_out)
6139 (*bed->s->swap_reloca_out) (output_bfd, &irela, (bfd_byte *) erela);
6141 elf_swap_reloca_out (output_bfd, &irela, erela);
6144 ++elf_section_data (output_section)->rel_count;
6149 /* Allocate a pointer to live in a linker created section. */
6152 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
6154 struct bfd_link_info *info;
6155 elf_linker_section_t *lsect;
6156 struct elf_link_hash_entry *h;
6157 const Elf_Internal_Rela *rel;
6159 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
6160 elf_linker_section_pointers_t *linker_section_ptr;
6161 unsigned long r_symndx = ELF_R_SYM (rel->r_info);;
6163 BFD_ASSERT (lsect != NULL);
6165 /* Is this a global symbol? */
6168 /* Has this symbol already been allocated, if so, our work is done */
6169 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
6174 ptr_linker_section_ptr = &h->linker_section_pointer;
6175 /* Make sure this symbol is output as a dynamic symbol. */
6176 if (h->dynindx == -1)
6178 if (! elf_link_record_dynamic_symbol (info, h))
6182 if (lsect->rel_section)
6183 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
6186 else /* Allocation of a pointer to a local symbol */
6188 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
6190 /* Allocate a table to hold the local symbols if first time */
6193 unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
6194 register unsigned int i;
6196 ptr = (elf_linker_section_pointers_t **)
6197 bfd_alloc (abfd, num_symbols * sizeof (elf_linker_section_pointers_t *));
6202 elf_local_ptr_offsets (abfd) = ptr;
6203 for (i = 0; i < num_symbols; i++)
6204 ptr[i] = (elf_linker_section_pointers_t *)0;
6207 /* Has this symbol already been allocated, if so, our work is done */
6208 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
6213 ptr_linker_section_ptr = &ptr[r_symndx];
6217 /* If we are generating a shared object, we need to
6218 output a R_<xxx>_RELATIVE reloc so that the
6219 dynamic linker can adjust this GOT entry. */
6220 BFD_ASSERT (lsect->rel_section != NULL);
6221 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
6225 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
6226 from internal memory. */
6227 BFD_ASSERT (ptr_linker_section_ptr != NULL);
6228 linker_section_ptr = (elf_linker_section_pointers_t *)
6229 bfd_alloc (abfd, sizeof (elf_linker_section_pointers_t));
6231 if (!linker_section_ptr)
6234 linker_section_ptr->next = *ptr_linker_section_ptr;
6235 linker_section_ptr->addend = rel->r_addend;
6236 linker_section_ptr->which = lsect->which;
6237 linker_section_ptr->written_address_p = false;
6238 *ptr_linker_section_ptr = linker_section_ptr;
6241 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
6243 linker_section_ptr->offset = lsect->section->_raw_size - lsect->hole_size + (ARCH_SIZE / 8);
6244 lsect->hole_offset += ARCH_SIZE / 8;
6245 lsect->sym_offset += ARCH_SIZE / 8;
6246 if (lsect->sym_hash) /* Bump up symbol value if needed */
6248 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
6250 fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
6251 lsect->sym_hash->root.root.string,
6252 (long)ARCH_SIZE / 8,
6253 (long)lsect->sym_hash->root.u.def.value);
6259 linker_section_ptr->offset = lsect->section->_raw_size;
6261 lsect->section->_raw_size += ARCH_SIZE / 8;
6264 fprintf (stderr, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
6265 lsect->name, (long)linker_section_ptr->offset, (long)lsect->section->_raw_size);
6272 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
6275 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
6278 /* Fill in the address for a pointer generated in alinker section. */
6281 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h, relocation, rel, relative_reloc)
6284 struct bfd_link_info *info;
6285 elf_linker_section_t *lsect;
6286 struct elf_link_hash_entry *h;
6288 const Elf_Internal_Rela *rel;
6291 elf_linker_section_pointers_t *linker_section_ptr;
6293 BFD_ASSERT (lsect != NULL);
6295 if (h != NULL) /* global symbol */
6297 linker_section_ptr = _bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
6301 BFD_ASSERT (linker_section_ptr != NULL);
6303 if (! elf_hash_table (info)->dynamic_sections_created
6306 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
6308 /* This is actually a static link, or it is a
6309 -Bsymbolic link and the symbol is defined
6310 locally. We must initialize this entry in the
6313 When doing a dynamic link, we create a .rela.<xxx>
6314 relocation entry to initialize the value. This
6315 is done in the finish_dynamic_symbol routine. */
6316 if (!linker_section_ptr->written_address_p)
6318 linker_section_ptr->written_address_p = true;
6319 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
6320 lsect->section->contents + linker_section_ptr->offset);
6324 else /* local symbol */
6326 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
6327 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
6328 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
6329 linker_section_ptr = _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd)[r_symndx],
6333 BFD_ASSERT (linker_section_ptr != NULL);
6335 /* Write out pointer if it hasn't been rewritten out before */
6336 if (!linker_section_ptr->written_address_p)
6338 linker_section_ptr->written_address_p = true;
6339 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
6340 lsect->section->contents + linker_section_ptr->offset);
6344 asection *srel = lsect->rel_section;
6345 Elf_Internal_Rela outrel;
6347 /* We need to generate a relative reloc for the dynamic linker. */
6349 lsect->rel_section = srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
6352 BFD_ASSERT (srel != NULL);
6354 outrel.r_offset = (lsect->section->output_section->vma
6355 + lsect->section->output_offset
6356 + linker_section_ptr->offset);
6357 outrel.r_info = ELF_R_INFO (0, relative_reloc);
6358 outrel.r_addend = 0;
6359 elf_swap_reloca_out (output_bfd, &outrel,
6360 (((Elf_External_Rela *)
6361 lsect->section->contents)
6362 + elf_section_data (lsect->section)->rel_count));
6363 ++elf_section_data (lsect->section)->rel_count;
6368 relocation = (lsect->section->output_offset
6369 + linker_section_ptr->offset
6370 - lsect->hole_offset
6371 - lsect->sym_offset);
6374 fprintf (stderr, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
6375 lsect->name, (long)relocation, (long)relocation);
6378 /* Subtract out the addend, because it will get added back in by the normal
6380 return relocation - linker_section_ptr->addend;
6383 /* Garbage collect unused sections. */
6385 static boolean elf_gc_mark
6386 PARAMS ((struct bfd_link_info *info, asection *sec,
6387 asection * (*gc_mark_hook)
6388 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
6389 struct elf_link_hash_entry *, Elf_Internal_Sym *))));
6391 static boolean elf_gc_sweep
6392 PARAMS ((struct bfd_link_info *info,
6393 boolean (*gc_sweep_hook)
6394 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
6395 const Elf_Internal_Rela *relocs))));
6397 static boolean elf_gc_sweep_symbol
6398 PARAMS ((struct elf_link_hash_entry *h, PTR idxptr));
6400 static boolean elf_gc_allocate_got_offsets
6401 PARAMS ((struct elf_link_hash_entry *h, PTR offarg));
6403 static boolean elf_gc_propagate_vtable_entries_used
6404 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
6406 static boolean elf_gc_smash_unused_vtentry_relocs
6407 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
6409 /* The mark phase of garbage collection. For a given section, mark
6410 it, and all the sections which define symbols to which it refers. */
6413 elf_gc_mark (info, sec, gc_mark_hook)
6414 struct bfd_link_info *info;
6416 asection * (*gc_mark_hook)
6417 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
6418 struct elf_link_hash_entry *, Elf_Internal_Sym *));
6424 /* Look through the section relocs. */
6426 if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
6428 Elf_Internal_Rela *relstart, *rel, *relend;
6429 Elf_Internal_Shdr *symtab_hdr;
6430 struct elf_link_hash_entry **sym_hashes;
6433 Elf_External_Sym *locsyms, *freesyms = NULL;
6434 bfd *input_bfd = sec->owner;
6435 struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
6437 /* GCFIXME: how to arrange so that relocs and symbols are not
6438 reread continually? */
6440 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
6441 sym_hashes = elf_sym_hashes (input_bfd);
6443 /* Read the local symbols. */
6444 if (elf_bad_symtab (input_bfd))
6446 nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6450 extsymoff = nlocsyms = symtab_hdr->sh_info;
6451 if (symtab_hdr->contents)
6452 locsyms = (Elf_External_Sym *) symtab_hdr->contents;
6453 else if (nlocsyms == 0)
6457 locsyms = freesyms =
6458 bfd_malloc (nlocsyms * sizeof (Elf_External_Sym));
6459 if (freesyms == NULL
6460 || bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
6461 || (bfd_read (locsyms, sizeof (Elf_External_Sym),
6462 nlocsyms, input_bfd)
6463 != nlocsyms * sizeof (Elf_External_Sym)))
6470 /* Read the relocations. */
6471 relstart = (NAME(_bfd_elf,link_read_relocs)
6472 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL,
6473 info->keep_memory));
6474 if (relstart == NULL)
6479 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
6481 for (rel = relstart; rel < relend; rel++)
6483 unsigned long r_symndx;
6485 struct elf_link_hash_entry *h;
6488 r_symndx = ELF_R_SYM (rel->r_info);
6492 if (elf_bad_symtab (sec->owner))
6494 elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
6495 if (ELF_ST_BIND (s.st_info) == STB_LOCAL)
6496 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
6499 h = sym_hashes[r_symndx - extsymoff];
6500 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
6503 else if (r_symndx >= nlocsyms)
6505 h = sym_hashes[r_symndx - extsymoff];
6506 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
6510 elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
6511 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
6514 if (rsec && !rsec->gc_mark)
6515 if (!elf_gc_mark (info, rsec, gc_mark_hook))
6523 if (!info->keep_memory)
6533 /* The sweep phase of garbage collection. Remove all garbage sections. */
6536 elf_gc_sweep (info, gc_sweep_hook)
6537 struct bfd_link_info *info;
6538 boolean (*gc_sweep_hook)
6539 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
6540 const Elf_Internal_Rela *relocs));
6544 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
6548 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
6551 for (o = sub->sections; o != NULL; o = o->next)
6553 /* Keep special sections. Keep .debug sections. */
6554 if ((o->flags & SEC_LINKER_CREATED)
6555 || (o->flags & SEC_DEBUGGING))
6561 /* Skip sweeping sections already excluded. */
6562 if (o->flags & SEC_EXCLUDE)
6565 /* Since this is early in the link process, it is simple
6566 to remove a section from the output. */
6567 o->flags |= SEC_EXCLUDE;
6569 /* But we also have to update some of the relocation
6570 info we collected before. */
6572 && (o->flags & SEC_RELOC) && o->reloc_count > 0)
6574 Elf_Internal_Rela *internal_relocs;
6577 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
6578 (o->owner, o, NULL, NULL, info->keep_memory));
6579 if (internal_relocs == NULL)
6582 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
6584 if (!info->keep_memory)
6585 free (internal_relocs);
6593 /* Remove the symbols that were in the swept sections from the dynamic
6594 symbol table. GCFIXME: Anyone know how to get them out of the
6595 static symbol table as well? */
6599 elf_link_hash_traverse (elf_hash_table (info),
6600 elf_gc_sweep_symbol,
6603 elf_hash_table (info)->dynsymcount = i;
6609 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6612 elf_gc_sweep_symbol (h, idxptr)
6613 struct elf_link_hash_entry *h;
6616 int *idx = (int *) idxptr;
6618 if (h->dynindx != -1
6619 && ((h->root.type != bfd_link_hash_defined
6620 && h->root.type != bfd_link_hash_defweak)
6621 || h->root.u.def.section->gc_mark))
6622 h->dynindx = (*idx)++;
6627 /* Propogate collected vtable information. This is called through
6628 elf_link_hash_traverse. */
6631 elf_gc_propagate_vtable_entries_used (h, okp)
6632 struct elf_link_hash_entry *h;
6635 /* Those that are not vtables. */
6636 if (h->vtable_parent == NULL)
6639 /* Those vtables that do not have parents, we cannot merge. */
6640 if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
6643 /* If we've already been done, exit. */
6644 if (h->vtable_entries_used && h->vtable_entries_used[-1])
6647 /* Make sure the parent's table is up to date. */
6648 elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
6650 if (h->vtable_entries_used == NULL)
6652 /* None of this table's entries were referenced. Re-use the
6654 h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
6655 h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
6662 /* Or the parent's entries into ours. */
6663 cu = h->vtable_entries_used;
6665 pu = h->vtable_parent->vtable_entries_used;
6668 n = h->vtable_parent->vtable_entries_size / FILE_ALIGN;
6671 if (*pu) *cu = true;
6681 elf_gc_smash_unused_vtentry_relocs (h, okp)
6682 struct elf_link_hash_entry *h;
6686 bfd_vma hstart, hend;
6687 Elf_Internal_Rela *relstart, *relend, *rel;
6688 struct elf_backend_data *bed;
6690 /* Take care of both those symbols that do not describe vtables as
6691 well as those that are not loaded. */
6692 if (h->vtable_parent == NULL)
6695 BFD_ASSERT (h->root.type == bfd_link_hash_defined
6696 || h->root.type == bfd_link_hash_defweak);
6698 sec = h->root.u.def.section;
6699 hstart = h->root.u.def.value;
6700 hend = hstart + h->size;
6702 relstart = (NAME(_bfd_elf,link_read_relocs)
6703 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true));
6705 return *(boolean *)okp = false;
6706 bed = get_elf_backend_data (sec->owner);
6707 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
6709 for (rel = relstart; rel < relend; ++rel)
6710 if (rel->r_offset >= hstart && rel->r_offset < hend)
6712 /* If the entry is in use, do nothing. */
6713 if (h->vtable_entries_used
6714 && (rel->r_offset - hstart) < h->vtable_entries_size)
6716 bfd_vma entry = (rel->r_offset - hstart) / FILE_ALIGN;
6717 if (h->vtable_entries_used[entry])
6720 /* Otherwise, kill it. */
6721 rel->r_offset = rel->r_info = rel->r_addend = 0;
6727 /* Do mark and sweep of unused sections. */
6730 elf_gc_sections (abfd, info)
6732 struct bfd_link_info *info;
6736 asection * (*gc_mark_hook)
6737 PARAMS ((bfd *abfd, struct bfd_link_info *, Elf_Internal_Rela *,
6738 struct elf_link_hash_entry *h, Elf_Internal_Sym *));
6740 if (!get_elf_backend_data (abfd)->can_gc_sections
6741 || info->relocateable || info->emitrelocations
6742 || elf_hash_table (info)->dynamic_sections_created)
6745 /* Apply transitive closure to the vtable entry usage info. */
6746 elf_link_hash_traverse (elf_hash_table (info),
6747 elf_gc_propagate_vtable_entries_used,
6752 /* Kill the vtable relocations that were not used. */
6753 elf_link_hash_traverse (elf_hash_table (info),
6754 elf_gc_smash_unused_vtentry_relocs,
6759 /* Grovel through relocs to find out who stays ... */
6761 gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
6762 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
6766 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
6769 for (o = sub->sections; o != NULL; o = o->next)
6771 if (o->flags & SEC_KEEP)
6772 if (!elf_gc_mark (info, o, gc_mark_hook))
6777 /* ... and mark SEC_EXCLUDE for those that go. */
6778 if (!elf_gc_sweep(info, get_elf_backend_data (abfd)->gc_sweep_hook))
6784 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6787 elf_gc_record_vtinherit (abfd, sec, h, offset)
6790 struct elf_link_hash_entry *h;
6793 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
6794 struct elf_link_hash_entry **search, *child;
6795 bfd_size_type extsymcount;
6797 /* The sh_info field of the symtab header tells us where the
6798 external symbols start. We don't care about the local symbols at
6800 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
6801 if (!elf_bad_symtab (abfd))
6802 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
6804 sym_hashes = elf_sym_hashes (abfd);
6805 sym_hashes_end = sym_hashes + extsymcount;
6807 /* Hunt down the child symbol, which is in this section at the same
6808 offset as the relocation. */
6809 for (search = sym_hashes; search != sym_hashes_end; ++search)
6811 if ((child = *search) != NULL
6812 && (child->root.type == bfd_link_hash_defined
6813 || child->root.type == bfd_link_hash_defweak)
6814 && child->root.u.def.section == sec
6815 && child->root.u.def.value == offset)
6819 (*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
6820 bfd_get_filename (abfd), sec->name,
6821 (unsigned long)offset);
6822 bfd_set_error (bfd_error_invalid_operation);
6828 /* This *should* only be the absolute section. It could potentially
6829 be that someone has defined a non-global vtable though, which
6830 would be bad. It isn't worth paging in the local symbols to be
6831 sure though; that case should simply be handled by the assembler. */
6833 child->vtable_parent = (struct elf_link_hash_entry *) -1;
6836 child->vtable_parent = h;
6841 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6844 elf_gc_record_vtentry (abfd, sec, h, addend)
6845 bfd *abfd ATTRIBUTE_UNUSED;
6846 asection *sec ATTRIBUTE_UNUSED;
6847 struct elf_link_hash_entry *h;
6850 if (addend >= h->vtable_entries_size)
6853 boolean *ptr = h->vtable_entries_used;
6855 /* While the symbol is undefined, we have to be prepared to handle
6857 if (h->root.type == bfd_link_hash_undefined)
6864 /* Oops! We've got a reference past the defined end of
6865 the table. This is probably a bug -- shall we warn? */
6870 /* Allocate one extra entry for use as a "done" flag for the
6871 consolidation pass. */
6872 bytes = (size / FILE_ALIGN + 1) * sizeof (boolean);
6876 ptr = bfd_realloc (ptr - 1, bytes);
6882 oldbytes = (h->vtable_entries_size/FILE_ALIGN + 1) * sizeof (boolean);
6883 memset (((char *)ptr) + oldbytes, 0, bytes - oldbytes);
6887 ptr = bfd_zmalloc (bytes);
6892 /* And arrange for that done flag to be at index -1. */
6893 h->vtable_entries_used = ptr + 1;
6894 h->vtable_entries_size = size;
6897 h->vtable_entries_used[addend / FILE_ALIGN] = true;
6902 /* And an accompanying bit to work out final got entry offsets once
6903 we're done. Should be called from final_link. */
6906 elf_gc_common_finalize_got_offsets (abfd, info)
6908 struct bfd_link_info *info;
6911 struct elf_backend_data *bed = get_elf_backend_data (abfd);
6914 /* The GOT offset is relative to the .got section, but the GOT header is
6915 put into the .got.plt section, if the backend uses it. */
6916 if (bed->want_got_plt)
6919 gotoff = bed->got_header_size;
6921 /* Do the local .got entries first. */
6922 for (i = info->input_bfds; i; i = i->link_next)
6924 bfd_signed_vma *local_got;
6925 bfd_size_type j, locsymcount;
6926 Elf_Internal_Shdr *symtab_hdr;
6928 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
6931 local_got = elf_local_got_refcounts (i);
6935 symtab_hdr = &elf_tdata (i)->symtab_hdr;
6936 if (elf_bad_symtab (i))
6937 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6939 locsymcount = symtab_hdr->sh_info;
6941 for (j = 0; j < locsymcount; ++j)
6943 if (local_got[j] > 0)
6945 local_got[j] = gotoff;
6946 gotoff += ARCH_SIZE / 8;
6949 local_got[j] = (bfd_vma) -1;
6953 /* Then the global .got entries. .plt refcounts are handled by
6954 adjust_dynamic_symbol */
6955 elf_link_hash_traverse (elf_hash_table (info),
6956 elf_gc_allocate_got_offsets,
6961 /* We need a special top-level link routine to convert got reference counts
6962 to real got offsets. */
6965 elf_gc_allocate_got_offsets (h, offarg)
6966 struct elf_link_hash_entry *h;
6969 bfd_vma *off = (bfd_vma *) offarg;
6971 if (h->got.refcount > 0)
6973 h->got.offset = off[0];
6974 off[0] += ARCH_SIZE / 8;
6977 h->got.offset = (bfd_vma) -1;
6982 /* Many folk need no more in the way of final link than this, once
6983 got entry reference counting is enabled. */
6986 elf_gc_common_final_link (abfd, info)
6988 struct bfd_link_info *info;
6990 if (!elf_gc_common_finalize_got_offsets (abfd, info))
6993 /* Invoke the regular ELF backend linker to do all the work. */
6994 return elf_bfd_final_link (abfd, info);
6997 /* This function will be called though elf_link_hash_traverse to store
6998 all hash value of the exported symbols in an array. */
7001 elf_collect_hash_codes (h, data)
7002 struct elf_link_hash_entry *h;
7005 unsigned long **valuep = (unsigned long **) data;
7011 /* Ignore indirect symbols. These are added by the versioning code. */
7012 if (h->dynindx == -1)
7015 name = h->root.root.string;
7016 p = strchr (name, ELF_VER_CHR);
7019 alc = bfd_malloc (p - name + 1);
7020 memcpy (alc, name, p - name);
7021 alc[p - name] = '\0';
7025 /* Compute the hash value. */
7026 ha = bfd_elf_hash (name);
7028 /* Store the found hash value in the array given as the argument. */
7031 /* And store it in the struct so that we can put it in the hash table
7033 h->elf_hash_value = ha;