2 Copyright 1995, 1996 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 static boolean elf_link_add_object_symbols
23 PARAMS ((bfd *, struct bfd_link_info *));
24 static boolean elf_link_add_archive_symbols
25 PARAMS ((bfd *, struct bfd_link_info *));
26 static Elf_Internal_Rela *elf_link_read_relocs
27 PARAMS ((bfd *, asection *, PTR, Elf_Internal_Rela *, boolean));
28 static boolean elf_export_symbol
29 PARAMS ((struct elf_link_hash_entry *, PTR));
30 static boolean elf_adjust_dynamic_symbol
31 PARAMS ((struct elf_link_hash_entry *, PTR));
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
39 struct bfd_link_info *info;
42 /* Given an ELF BFD, add symbols to the global hash table as
46 elf_bfd_link_add_symbols (abfd, info)
48 struct bfd_link_info *info;
50 switch (bfd_get_format (abfd))
53 return elf_link_add_object_symbols (abfd, info);
55 return elf_link_add_archive_symbols (abfd, info);
57 bfd_set_error (bfd_error_wrong_format);
63 /* Add symbols from an ELF archive file to the linker hash table. We
64 don't use _bfd_generic_link_add_archive_symbols because of a
65 problem which arises on UnixWare. The UnixWare libc.so is an
66 archive which includes an entry libc.so.1 which defines a bunch of
67 symbols. The libc.so archive also includes a number of other
68 object files, which also define symbols, some of which are the same
69 as those defined in libc.so.1. Correct linking requires that we
70 consider each object file in turn, and include it if it defines any
71 symbols we need. _bfd_generic_link_add_archive_symbols does not do
72 this; it looks through the list of undefined symbols, and includes
73 any object file which defines them. When this algorithm is used on
74 UnixWare, it winds up pulling in libc.so.1 early and defining a
75 bunch of symbols. This means that some of the other objects in the
76 archive are not included in the link, which is incorrect since they
77 precede libc.so.1 in the archive.
79 Fortunately, ELF archive handling is simpler than that done by
80 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
81 oddities. In ELF, if we find a symbol in the archive map, and the
82 symbol is currently undefined, we know that we must pull in that
85 Unfortunately, we do have to make multiple passes over the symbol
86 table until nothing further is resolved. */
89 elf_link_add_archive_symbols (abfd, info)
91 struct bfd_link_info *info;
94 boolean *defined = NULL;
95 boolean *included = NULL;
99 if (! bfd_has_map (abfd))
101 /* An empty archive is a special case. */
102 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
104 bfd_set_error (bfd_error_no_armap);
108 /* Keep track of all symbols we know to be already defined, and all
109 files we know to be already included. This is to speed up the
110 second and subsequent passes. */
111 c = bfd_ardata (abfd)->symdef_count;
114 defined = (boolean *) bfd_malloc (c * sizeof (boolean));
115 included = (boolean *) bfd_malloc (c * sizeof (boolean));
116 if (defined == (boolean *) NULL || included == (boolean *) NULL)
118 memset (defined, 0, c * sizeof (boolean));
119 memset (included, 0, c * sizeof (boolean));
121 symdefs = bfd_ardata (abfd)->symdefs;
134 symdefend = symdef + c;
135 for (i = 0; symdef < symdefend; symdef++, i++)
137 struct elf_link_hash_entry *h;
139 struct bfd_link_hash_entry *undefs_tail;
142 if (defined[i] || included[i])
144 if (symdef->file_offset == last)
150 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
151 false, false, false);
152 if (h == (struct elf_link_hash_entry *) NULL)
154 if (h->root.type != bfd_link_hash_undefined)
156 if (h->root.type != bfd_link_hash_undefweak)
161 /* We need to include this archive member. */
163 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
164 if (element == (bfd *) NULL)
167 if (! bfd_check_format (element, bfd_object))
170 /* Doublecheck that we have not included this object
171 already--it should be impossible, but there may be
172 something wrong with the archive. */
173 if (element->archive_pass != 0)
175 bfd_set_error (bfd_error_bad_value);
178 element->archive_pass = 1;
180 undefs_tail = info->hash->undefs_tail;
182 if (! (*info->callbacks->add_archive_element) (info, element,
185 if (! elf_link_add_object_symbols (element, info))
188 /* If there are any new undefined symbols, we need to make
189 another pass through the archive in order to see whether
190 they can be defined. FIXME: This isn't perfect, because
191 common symbols wind up on undefs_tail and because an
192 undefined symbol which is defined later on in this pass
193 does not require another pass. This isn't a bug, but it
194 does make the code less efficient than it could be. */
195 if (undefs_tail != info->hash->undefs_tail)
198 /* Look backward to mark all symbols from this object file
199 which we have already seen in this pass. */
203 included[mark] = true;
208 while (symdefs[mark].file_offset == symdef->file_offset);
210 /* We mark subsequent symbols from this object file as we go
211 on through the loop. */
212 last = symdef->file_offset;
223 if (defined != (boolean *) NULL)
225 if (included != (boolean *) NULL)
230 /* Add symbols from an ELF object file to the linker hash table. */
233 elf_link_add_object_symbols (abfd, info)
235 struct bfd_link_info *info;
237 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
238 const Elf_Internal_Sym *,
239 const char **, flagword *,
240 asection **, bfd_vma *));
241 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
242 asection *, const Elf_Internal_Rela *));
244 Elf_Internal_Shdr *hdr;
248 Elf_External_Sym *buf = NULL;
249 struct elf_link_hash_entry **sym_hash;
251 Elf_External_Dyn *dynbuf = NULL;
252 struct elf_link_hash_entry *weaks;
253 Elf_External_Sym *esym;
254 Elf_External_Sym *esymend;
256 add_symbol_hook = get_elf_backend_data (abfd)->elf_add_symbol_hook;
257 collect = get_elf_backend_data (abfd)->collect;
259 /* As a GNU extension, any input sections which are named
260 .gnu.warning.SYMBOL are treated as warning symbols for the given
261 symbol. This differs from .gnu.warning sections, which generate
262 warnings when they are included in an output file. */
267 for (s = abfd->sections; s != NULL; s = s->next)
271 name = bfd_get_section_name (abfd, s);
272 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
277 sz = bfd_section_size (abfd, s);
278 msg = (char *) bfd_alloc (abfd, sz);
282 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
285 if (! (_bfd_generic_link_add_one_symbol
287 name + sizeof ".gnu.warning." - 1,
288 BSF_WARNING, s, (bfd_vma) 0, msg, false, collect,
289 (struct bfd_link_hash_entry **) NULL)))
292 if (! info->relocateable)
294 /* Clobber the section size so that the warning does
295 not get copied into the output file. */
302 /* A stripped shared library might only have a dynamic symbol table,
303 not a regular symbol table. In that case we can still go ahead
304 and link using the dynamic symbol table. */
305 if (elf_onesymtab (abfd) == 0
306 && elf_dynsymtab (abfd) != 0)
308 elf_onesymtab (abfd) = elf_dynsymtab (abfd);
309 elf_tdata (abfd)->symtab_hdr = elf_tdata (abfd)->dynsymtab_hdr;
312 hdr = &elf_tdata (abfd)->symtab_hdr;
313 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
315 /* The sh_info field of the symtab header tells us where the
316 external symbols start. We don't care about the local symbols at
318 if (elf_bad_symtab (abfd))
320 extsymcount = symcount;
325 extsymcount = symcount - hdr->sh_info;
326 extsymoff = hdr->sh_info;
329 buf = ((Elf_External_Sym *)
330 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
331 if (buf == NULL && extsymcount != 0)
334 /* We store a pointer to the hash table entry for each external
336 sym_hash = ((struct elf_link_hash_entry **)
338 extsymcount * sizeof (struct elf_link_hash_entry *)));
339 if (sym_hash == NULL)
341 elf_sym_hashes (abfd) = sym_hash;
343 if (elf_elfheader (abfd)->e_type != ET_DYN)
347 /* If we are creating a shared library, create all the dynamic
348 sections immediately. We need to attach them to something,
349 so we attach them to this BFD, provided it is the right
350 format. FIXME: If there are no input BFD's of the same
351 format as the output, we can't make a shared library. */
353 && ! elf_hash_table (info)->dynamic_sections_created
354 && abfd->xvec == info->hash->creator)
356 if (! elf_link_create_dynamic_sections (abfd, info))
365 bfd_size_type oldsize;
366 bfd_size_type strindex;
370 /* You can't use -r against a dynamic object. Also, there's no
371 hope of using a dynamic object which does not exactly match
372 the format of the output file. */
373 if (info->relocateable
374 || info->hash->creator != abfd->xvec)
376 bfd_set_error (bfd_error_invalid_operation);
380 /* Find the name to use in a DT_NEEDED entry that refers to this
381 object. If the object has a DT_SONAME entry, we use it.
382 Otherwise, if the generic linker stuck something in
383 elf_dt_needed_name, we use that. Otherwise, we just use the
384 file name. If the generic linker put a null string into
385 elf_dt_needed_name, we don't make a DT_NEEDED entry at all,
386 even if there is a DT_SONAME entry. */
388 name = bfd_get_filename (abfd);
389 if (elf_dt_needed_name (abfd) != NULL)
391 name = elf_dt_needed_name (abfd);
395 s = bfd_get_section_by_name (abfd, ".dynamic");
398 Elf_External_Dyn *extdyn;
399 Elf_External_Dyn *extdynend;
403 dynbuf = (Elf_External_Dyn *) bfd_malloc ((size_t) s->_raw_size);
407 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
408 (file_ptr) 0, s->_raw_size))
411 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
414 link = elf_elfsections (abfd)[elfsec]->sh_link;
417 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
418 for (; extdyn < extdynend; extdyn++)
420 Elf_Internal_Dyn dyn;
422 elf_swap_dyn_in (abfd, extdyn, &dyn);
423 if (add_needed && dyn.d_tag == DT_SONAME)
425 name = bfd_elf_string_from_elf_section (abfd, link,
430 if (dyn.d_tag == DT_NEEDED)
432 struct bfd_link_needed_list *n, **pn;
435 n = ((struct bfd_link_needed_list *)
436 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
437 fnm = bfd_elf_string_from_elf_section (abfd, link,
439 if (n == NULL || fnm == NULL)
441 anm = bfd_alloc (abfd, strlen (fnm) + 1);
448 for (pn = &elf_hash_table (info)->needed;
460 /* We do not want to include any of the sections in a dynamic
461 object in the output file. We hack by simply clobbering the
462 list of sections in the BFD. This could be handled more
463 cleanly by, say, a new section flag; the existing
464 SEC_NEVER_LOAD flag is not the one we want, because that one
465 still implies that the section takes up space in the output
467 abfd->sections = NULL;
468 abfd->section_count = 0;
470 /* If this is the first dynamic object found in the link, create
471 the special sections required for dynamic linking. */
472 if (! elf_hash_table (info)->dynamic_sections_created)
474 if (! elf_link_create_dynamic_sections (abfd, info))
480 /* Add a DT_NEEDED entry for this dynamic object. */
481 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
482 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr, name,
484 if (strindex == (bfd_size_type) -1)
487 if (oldsize == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
490 Elf_External_Dyn *dyncon, *dynconend;
492 /* The hash table size did not change, which means that
493 the dynamic object name was already entered. If we
494 have already included this dynamic object in the
495 link, just ignore it. There is no reason to include
496 a particular dynamic object more than once. */
497 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
499 BFD_ASSERT (sdyn != NULL);
501 dyncon = (Elf_External_Dyn *) sdyn->contents;
502 dynconend = (Elf_External_Dyn *) (sdyn->contents +
504 for (; dyncon < dynconend; dyncon++)
506 Elf_Internal_Dyn dyn;
508 elf_swap_dyn_in (elf_hash_table (info)->dynobj, dyncon,
510 if (dyn.d_tag == DT_NEEDED
511 && dyn.d_un.d_val == strindex)
520 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
526 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
528 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
529 != extsymcount * sizeof (Elf_External_Sym)))
534 esymend = buf + extsymcount;
535 for (esym = buf; esym < esymend; esym++, sym_hash++)
537 Elf_Internal_Sym sym;
543 struct elf_link_hash_entry *h;
545 boolean size_change_ok, type_change_ok;
548 elf_swap_symbol_in (abfd, esym, &sym);
550 flags = BSF_NO_FLAGS;
552 value = sym.st_value;
555 bind = ELF_ST_BIND (sym.st_info);
556 if (bind == STB_LOCAL)
558 /* This should be impossible, since ELF requires that all
559 global symbols follow all local symbols, and that sh_info
560 point to the first global symbol. Unfortunatealy, Irix 5
564 else if (bind == STB_GLOBAL)
566 if (sym.st_shndx != SHN_UNDEF
567 && sym.st_shndx != SHN_COMMON)
572 else if (bind == STB_WEAK)
576 /* Leave it up to the processor backend. */
579 if (sym.st_shndx == SHN_UNDEF)
580 sec = bfd_und_section_ptr;
581 else if (sym.st_shndx > 0 && sym.st_shndx < SHN_LORESERVE)
583 sec = section_from_elf_index (abfd, sym.st_shndx);
587 sec = bfd_abs_section_ptr;
589 else if (sym.st_shndx == SHN_ABS)
590 sec = bfd_abs_section_ptr;
591 else if (sym.st_shndx == SHN_COMMON)
593 sec = bfd_com_section_ptr;
594 /* What ELF calls the size we call the value. What ELF
595 calls the value we call the alignment. */
600 /* Leave it up to the processor backend. */
603 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
604 if (name == (const char *) NULL)
609 if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
613 /* The hook function sets the name to NULL if this symbol
614 should be skipped for some reason. */
615 if (name == (const char *) NULL)
619 /* Sanity check that all possibilities were handled. */
620 if (sec == (asection *) NULL)
622 bfd_set_error (bfd_error_bad_value);
626 if (bfd_is_und_section (sec)
627 || bfd_is_com_section (sec))
632 size_change_ok = false;
633 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
634 if (info->hash->creator->flavour == bfd_target_elf_flavour)
636 /* We need to look up the symbol now in order to get some of
637 the dynamic object handling right. We pass the hash
638 table entry in to _bfd_generic_link_add_one_symbol so
639 that it does not have to look it up again. */
640 h = elf_link_hash_lookup (elf_hash_table (info), name,
646 if (h->root.type == bfd_link_hash_new)
647 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
649 while (h->root.type == bfd_link_hash_indirect
650 || h->root.type == bfd_link_hash_warning)
651 h = (struct elf_link_hash_entry *) h->root.u.i.link;
653 /* It's OK to change the type if it used to be a weak
655 if (h->root.type == bfd_link_hash_defweak
656 || h->root.type == bfd_link_hash_undefweak)
657 type_change_ok = true;
659 /* It's OK to change the size if it used to be a weak
660 definition, or if it used to be undefined, or if we will
661 be overriding an old definition. */
663 || h->root.type == bfd_link_hash_undefined)
664 size_change_ok = true;
666 /* If we are looking at a dynamic object, and this is a
667 definition, we need to see if it has already been defined
668 by some other object. If it has, we want to use the
669 existing definition, and we do not want to report a
670 multiple symbol definition error; we do this by
671 clobbering sec to be bfd_und_section_ptr. */
672 if (dynamic && definition)
674 if (h->root.type == bfd_link_hash_defined
675 || h->root.type == bfd_link_hash_defweak
676 || (h->root.type == bfd_link_hash_common
677 && bind == STB_WEAK))
679 sec = bfd_und_section_ptr;
681 size_change_ok = true;
685 /* Similarly, if we are not looking at a dynamic object, and
686 we have a definition, we want to override any definition
687 we may have from a dynamic object. Symbols from regular
688 files always take precedence over symbols from dynamic
689 objects, even if they are defined after the dynamic
690 object in the link. */
693 && (h->root.type == bfd_link_hash_defined
694 || h->root.type == bfd_link_hash_defweak)
695 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
696 && (bfd_get_flavour (h->root.u.def.section->owner)
697 == bfd_target_elf_flavour)
698 && (elf_elfheader (h->root.u.def.section->owner)->e_type
701 /* Change the hash table entry to undefined, and let
702 _bfd_generic_link_add_one_symbol do the right thing
703 with the new definition. */
704 h->root.type = bfd_link_hash_undefined;
705 h->root.u.undef.abfd = h->root.u.def.section->owner;
706 size_change_ok = true;
710 if (! (_bfd_generic_link_add_one_symbol
711 (info, abfd, name, flags, sec, value, (const char *) NULL,
712 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
716 while (h->root.type == bfd_link_hash_indirect
717 || h->root.type == bfd_link_hash_warning)
718 h = (struct elf_link_hash_entry *) h->root.u.i.link;
724 && (flags & BSF_WEAK) != 0
725 && ELF_ST_TYPE (sym.st_info) != STT_FUNC
726 && info->hash->creator->flavour == bfd_target_elf_flavour
727 && h->weakdef == NULL)
729 /* Keep a list of all weak defined non function symbols from
730 a dynamic object, using the weakdef field. Later in this
731 function we will set the weakdef field to the correct
732 value. We only put non-function symbols from dynamic
733 objects on this list, because that happens to be the only
734 time we need to know the normal symbol corresponding to a
735 weak symbol, and the information is time consuming to
736 figure out. If the weakdef field is not already NULL,
737 then this symbol was already defined by some previous
738 dynamic object, and we will be using that previous
739 definition anyhow. */
746 /* Get the alignment of a common symbol. */
747 if (sym.st_shndx == SHN_COMMON
748 && h->root.type == bfd_link_hash_common)
749 h->root.u.c.p->alignment_power = bfd_log2 (sym.st_value);
751 if (info->hash->creator->flavour == bfd_target_elf_flavour)
757 /* Remember the symbol size and type. */
759 && (definition || h->size == 0))
761 if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
762 (*_bfd_error_handler)
763 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
764 name, (unsigned long) h->size, (unsigned long) sym.st_size,
765 bfd_get_filename (abfd));
767 h->size = sym.st_size;
769 if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
770 && (definition || h->type == STT_NOTYPE))
772 if (h->type != STT_NOTYPE
773 && h->type != ELF_ST_TYPE (sym.st_info)
775 (*_bfd_error_handler)
776 ("Warning: type of symbol `%s' changed from %d to %d in %s",
777 name, h->type, ELF_ST_TYPE (sym.st_info),
778 bfd_get_filename (abfd));
780 h->type = ELF_ST_TYPE (sym.st_info);
783 /* Set a flag in the hash table entry indicating the type of
784 reference or definition we just found. Keep a count of
785 the number of dynamic symbols we find. A dynamic symbol
786 is one which is referenced or defined by both a regular
787 object and a shared object, or one which is referenced or
788 defined by more than one shared object. */
789 old_flags = h->elf_link_hash_flags;
794 new_flag = ELF_LINK_HASH_REF_REGULAR;
796 new_flag = ELF_LINK_HASH_DEF_REGULAR;
798 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
799 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
805 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
807 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
808 if ((old_flags & new_flag) != 0
809 || (old_flags & (ELF_LINK_HASH_DEF_REGULAR
810 | ELF_LINK_HASH_REF_REGULAR)) != 0
811 || (h->weakdef != NULL
812 && (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
813 | ELF_LINK_HASH_REF_DYNAMIC)) != 0))
817 h->elf_link_hash_flags |= new_flag;
818 if (dynsym && h->dynindx == -1)
820 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
822 if (h->weakdef != NULL
824 && h->weakdef->dynindx == -1)
826 if (! _bfd_elf_link_record_dynamic_symbol (info,
834 /* Now set the weakdefs field correctly for all the weak defined
835 symbols we found. The only way to do this is to search all the
836 symbols. Since we only need the information for non functions in
837 dynamic objects, that's the only time we actually put anything on
838 the list WEAKS. We need this information so that if a regular
839 object refers to a symbol defined weakly in a dynamic object, the
840 real symbol in the dynamic object is also put in the dynamic
841 symbols; we also must arrange for both symbols to point to the
842 same memory location. We could handle the general case of symbol
843 aliasing, but a general symbol alias can only be generated in
844 assembler code, handling it correctly would be very time
845 consuming, and other ELF linkers don't handle general aliasing
847 while (weaks != NULL)
849 struct elf_link_hash_entry *hlook;
852 struct elf_link_hash_entry **hpp;
853 struct elf_link_hash_entry **hppend;
856 weaks = hlook->weakdef;
857 hlook->weakdef = NULL;
859 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
860 || hlook->root.type == bfd_link_hash_defweak
861 || hlook->root.type == bfd_link_hash_common
862 || hlook->root.type == bfd_link_hash_indirect);
863 slook = hlook->root.u.def.section;
864 vlook = hlook->root.u.def.value;
866 hpp = elf_sym_hashes (abfd);
867 hppend = hpp + extsymcount;
868 for (; hpp < hppend; hpp++)
870 struct elf_link_hash_entry *h;
873 if (h != NULL && h != hlook
874 && h->root.type == bfd_link_hash_defined
875 && h->root.u.def.section == slook
876 && h->root.u.def.value == vlook)
880 /* If the weak definition is in the list of dynamic
881 symbols, make sure the real definition is put there
883 if (hlook->dynindx != -1
886 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
901 /* If this object is the same format as the output object, and it is
902 not a shared library, then let the backend look through the
905 This is required to build global offset table entries and to
906 arrange for dynamic relocs. It is not required for the
907 particular common case of linking non PIC code, even when linking
908 against shared libraries, but unfortunately there is no way of
909 knowing whether an object file has been compiled PIC or not.
910 Looking through the relocs is not particularly time consuming.
911 The problem is that we must either (1) keep the relocs in memory,
912 which causes the linker to require additional runtime memory or
913 (2) read the relocs twice from the input file, which wastes time.
914 This would be a good case for using mmap.
916 I have no idea how to handle linking PIC code into a file of a
917 different format. It probably can't be done. */
918 check_relocs = get_elf_backend_data (abfd)->check_relocs;
920 && abfd->xvec == info->hash->creator
921 && check_relocs != NULL)
925 for (o = abfd->sections; o != NULL; o = o->next)
927 Elf_Internal_Rela *internal_relocs;
930 if ((o->flags & SEC_RELOC) == 0
931 || o->reloc_count == 0)
934 /* I believe we can ignore the relocs for any section which
935 does not form part of the final process image, such as a
936 debugging section. */
937 if ((o->flags & SEC_ALLOC) == 0)
940 internal_relocs = elf_link_read_relocs (abfd, o, (PTR) NULL,
941 (Elf_Internal_Rela *) NULL,
943 if (internal_relocs == NULL)
946 ok = (*check_relocs) (abfd, info, o, internal_relocs);
948 if (! info->keep_memory)
949 free (internal_relocs);
966 /* Create some sections which will be filled in with dynamic linking
967 information. ABFD is an input file which requires dynamic sections
968 to be created. The dynamic sections take up virtual memory space
969 when the final executable is run, so we need to create them before
970 addresses are assigned to the output sections. We work out the
971 actual contents and size of these sections later. */
974 elf_link_create_dynamic_sections (abfd, info)
976 struct bfd_link_info *info;
979 register asection *s;
980 struct elf_link_hash_entry *h;
981 struct elf_backend_data *bed;
983 if (elf_hash_table (info)->dynamic_sections_created)
986 /* Make sure that all dynamic sections use the same input BFD. */
987 if (elf_hash_table (info)->dynobj == NULL)
988 elf_hash_table (info)->dynobj = abfd;
990 abfd = elf_hash_table (info)->dynobj;
992 /* Note that we set the SEC_IN_MEMORY flag for all of these
994 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
996 /* A dynamically linked executable has a .interp section, but a
997 shared library does not. */
1000 s = bfd_make_section (abfd, ".interp");
1002 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
1006 s = bfd_make_section (abfd, ".dynsym");
1008 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
1009 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
1012 s = bfd_make_section (abfd, ".dynstr");
1014 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
1017 /* Create a strtab to hold the dynamic symbol names. */
1018 if (elf_hash_table (info)->dynstr == NULL)
1020 elf_hash_table (info)->dynstr = elf_stringtab_init ();
1021 if (elf_hash_table (info)->dynstr == NULL)
1025 s = bfd_make_section (abfd, ".dynamic");
1027 || ! bfd_set_section_flags (abfd, s, flags)
1028 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
1031 /* The special symbol _DYNAMIC is always set to the start of the
1032 .dynamic section. This call occurs before we have processed the
1033 symbols for any dynamic object, so we don't have to worry about
1034 overriding a dynamic definition. We could set _DYNAMIC in a
1035 linker script, but we only want to define it if we are, in fact,
1036 creating a .dynamic section. We don't want to define it if there
1037 is no .dynamic section, since on some ELF platforms the start up
1038 code examines it to decide how to initialize the process. */
1040 if (! (_bfd_generic_link_add_one_symbol
1041 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
1042 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
1043 (struct bfd_link_hash_entry **) &h)))
1045 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
1046 h->type = STT_OBJECT;
1049 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
1052 s = bfd_make_section (abfd, ".hash");
1054 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
1055 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
1058 /* Let the backend create the rest of the sections. This lets the
1059 backend set the right flags. The backend will normally create
1060 the .got and .plt sections. */
1061 bed = get_elf_backend_data (abfd);
1062 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
1065 elf_hash_table (info)->dynamic_sections_created = true;
1070 /* Add an entry to the .dynamic table. */
1073 elf_add_dynamic_entry (info, tag, val)
1074 struct bfd_link_info *info;
1078 Elf_Internal_Dyn dyn;
1082 bfd_byte *newcontents;
1084 dynobj = elf_hash_table (info)->dynobj;
1086 s = bfd_get_section_by_name (dynobj, ".dynamic");
1087 BFD_ASSERT (s != NULL);
1089 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
1090 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
1091 if (newcontents == NULL)
1095 dyn.d_un.d_val = val;
1096 elf_swap_dyn_out (dynobj, &dyn,
1097 (Elf_External_Dyn *) (newcontents + s->_raw_size));
1099 s->_raw_size = newsize;
1100 s->contents = newcontents;
1106 /* Read and swap the relocs for a section. They may have been cached.
1107 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1108 they are used as buffers to read into. They are known to be large
1109 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1110 value is allocated using either malloc or bfd_alloc, according to
1111 the KEEP_MEMORY argument. */
1113 static Elf_Internal_Rela *
1114 elf_link_read_relocs (abfd, o, external_relocs, internal_relocs, keep_memory)
1117 PTR external_relocs;
1118 Elf_Internal_Rela *internal_relocs;
1119 boolean keep_memory;
1121 Elf_Internal_Shdr *rel_hdr;
1123 Elf_Internal_Rela *alloc2 = NULL;
1125 if (elf_section_data (o)->relocs != NULL)
1126 return elf_section_data (o)->relocs;
1128 if (o->reloc_count == 0)
1131 rel_hdr = &elf_section_data (o)->rel_hdr;
1133 if (internal_relocs == NULL)
1137 size = o->reloc_count * sizeof (Elf_Internal_Rela);
1139 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
1141 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
1142 if (internal_relocs == NULL)
1146 if (external_relocs == NULL)
1148 alloc1 = (PTR) bfd_malloc ((size_t) rel_hdr->sh_size);
1151 external_relocs = alloc1;
1154 if ((bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0)
1155 || (bfd_read (external_relocs, 1, rel_hdr->sh_size, abfd)
1156 != rel_hdr->sh_size))
1159 /* Swap in the relocs. For convenience, we always produce an
1160 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1162 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
1164 Elf_External_Rel *erel;
1165 Elf_External_Rel *erelend;
1166 Elf_Internal_Rela *irela;
1168 erel = (Elf_External_Rel *) external_relocs;
1169 erelend = erel + o->reloc_count;
1170 irela = internal_relocs;
1171 for (; erel < erelend; erel++, irela++)
1173 Elf_Internal_Rel irel;
1175 elf_swap_reloc_in (abfd, erel, &irel);
1176 irela->r_offset = irel.r_offset;
1177 irela->r_info = irel.r_info;
1178 irela->r_addend = 0;
1183 Elf_External_Rela *erela;
1184 Elf_External_Rela *erelaend;
1185 Elf_Internal_Rela *irela;
1187 BFD_ASSERT (rel_hdr->sh_entsize == sizeof (Elf_External_Rela));
1189 erela = (Elf_External_Rela *) external_relocs;
1190 erelaend = erela + o->reloc_count;
1191 irela = internal_relocs;
1192 for (; erela < erelaend; erela++, irela++)
1193 elf_swap_reloca_in (abfd, erela, irela);
1196 /* Cache the results for next time, if we can. */
1198 elf_section_data (o)->relocs = internal_relocs;
1203 /* Don't free alloc2, since if it was allocated we are passing it
1204 back (under the name of internal_relocs). */
1206 return internal_relocs;
1217 /* Record an assignment to a symbol made by a linker script. We need
1218 this in case some dynamic object refers to this symbol. */
1222 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
1224 struct bfd_link_info *info;
1228 struct elf_link_hash_entry *h;
1230 if (info->hash->creator->flavour != bfd_target_elf_flavour)
1233 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
1237 if (h->root.type == bfd_link_hash_new)
1238 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
1240 /* If this symbol is being provided by the linker script, and it is
1241 currently defined by a dynamic object, but not by a regular
1242 object, then mark it as undefined so that the generic linker will
1243 force the correct value. */
1245 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1246 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1247 h->root.type = bfd_link_hash_undefined;
1249 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
1250 h->type = STT_OBJECT;
1252 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
1253 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
1255 && h->dynindx == -1)
1257 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
1260 /* If this is a weak defined symbol, and we know a corresponding
1261 real symbol from the same dynamic object, make sure the real
1262 symbol is also made into a dynamic symbol. */
1263 if (h->weakdef != NULL
1264 && h->weakdef->dynindx == -1)
1266 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
1275 /* Array used to determine the number of hash table buckets to use
1276 based on the number of symbols there are. If there are fewer than
1277 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
1278 fewer than 37 we use 17 buckets, and so forth. We never use more
1279 than 521 buckets. */
1281 static const size_t elf_buckets[] =
1283 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 0
1286 /* Set up the sizes and contents of the ELF dynamic sections. This is
1287 called by the ELF linker emulation before_allocation routine. We
1288 must set the sizes of the sections before the linker sets the
1289 addresses of the various sections. */
1292 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
1293 export_dynamic, info, sinterpptr)
1297 boolean export_dynamic;
1298 struct bfd_link_info *info;
1299 asection **sinterpptr;
1302 struct elf_backend_data *bed;
1306 if (info->hash->creator->flavour != bfd_target_elf_flavour)
1309 dynobj = elf_hash_table (info)->dynobj;
1311 /* If there were no dynamic objects in the link, there is nothing to
1316 /* If we are supposed to export all symbols into the dynamic symbol
1317 table (this is not the normal case), then do so. */
1320 struct elf_info_failed eif;
1324 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
1330 if (elf_hash_table (info)->dynamic_sections_created)
1332 struct elf_info_failed eif;
1333 struct elf_link_hash_entry *h;
1334 bfd_size_type strsize;
1336 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
1337 BFD_ASSERT (*sinterpptr != NULL || info->shared);
1343 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, soname,
1345 if (indx == (bfd_size_type) -1
1346 || ! elf_add_dynamic_entry (info, DT_SONAME, indx))
1352 if (! elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
1360 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, rpath,
1362 if (indx == (bfd_size_type) -1
1363 || ! elf_add_dynamic_entry (info, DT_RPATH, indx))
1367 /* Find all symbols which were defined in a dynamic object and make
1368 the backend pick a reasonable value for them. */
1371 elf_link_hash_traverse (elf_hash_table (info),
1372 elf_adjust_dynamic_symbol,
1377 /* Add some entries to the .dynamic section. We fill in some of the
1378 values later, in elf_bfd_final_link, but we must add the entries
1379 now so that we know the final size of the .dynamic section. */
1380 h = elf_link_hash_lookup (elf_hash_table (info), "_init", false,
1383 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
1384 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
1386 if (! elf_add_dynamic_entry (info, DT_INIT, 0))
1389 h = elf_link_hash_lookup (elf_hash_table (info), "_fini", false,
1392 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
1393 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
1395 if (! elf_add_dynamic_entry (info, DT_FINI, 0))
1398 strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1399 if (! elf_add_dynamic_entry (info, DT_HASH, 0)
1400 || ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
1401 || ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
1402 || ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
1403 || ! elf_add_dynamic_entry (info, DT_SYMENT,
1404 sizeof (Elf_External_Sym)))
1408 /* The backend must work out the sizes of all the other dynamic
1410 bed = get_elf_backend_data (output_bfd);
1411 if (! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
1414 if (elf_hash_table (info)->dynamic_sections_created)
1419 size_t bucketcount = 0;
1420 Elf_Internal_Sym isym;
1422 /* Set the size of the .dynsym and .hash sections. We counted
1423 the number of dynamic symbols in elf_link_add_object_symbols.
1424 We will build the contents of .dynsym and .hash when we build
1425 the final symbol table, because until then we do not know the
1426 correct value to give the symbols. We built the .dynstr
1427 section as we went along in elf_link_add_object_symbols. */
1428 dynsymcount = elf_hash_table (info)->dynsymcount;
1429 s = bfd_get_section_by_name (dynobj, ".dynsym");
1430 BFD_ASSERT (s != NULL);
1431 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
1432 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
1433 if (s->contents == NULL && s->_raw_size != 0)
1436 /* The first entry in .dynsym is a dummy symbol. */
1443 elf_swap_symbol_out (output_bfd, &isym,
1444 (PTR) (Elf_External_Sym *) s->contents);
1446 for (i = 0; elf_buckets[i] != 0; i++)
1448 bucketcount = elf_buckets[i];
1449 if (dynsymcount < elf_buckets[i + 1])
1453 s = bfd_get_section_by_name (dynobj, ".hash");
1454 BFD_ASSERT (s != NULL);
1455 s->_raw_size = (2 + bucketcount + dynsymcount) * (ARCH_SIZE / 8);
1456 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
1457 if (s->contents == NULL)
1459 memset (s->contents, 0, (size_t) s->_raw_size);
1461 put_word (output_bfd, bucketcount, s->contents);
1462 put_word (output_bfd, dynsymcount, s->contents + (ARCH_SIZE / 8));
1464 elf_hash_table (info)->bucketcount = bucketcount;
1466 s = bfd_get_section_by_name (dynobj, ".dynstr");
1467 BFD_ASSERT (s != NULL);
1468 s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1470 if (! elf_add_dynamic_entry (info, DT_NULL, 0))
1478 /* This routine is used to export all defined symbols into the dynamic
1479 symbol table. It is called via elf_link_hash_traverse. */
1482 elf_export_symbol (h, data)
1483 struct elf_link_hash_entry *h;
1486 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1488 if (h->dynindx == -1
1489 && (h->elf_link_hash_flags
1490 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
1492 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
1503 /* Make the backend pick a good value for a dynamic symbol. This is
1504 called via elf_link_hash_traverse, and also calls itself
1508 elf_adjust_dynamic_symbol (h, data)
1509 struct elf_link_hash_entry *h;
1512 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1514 struct elf_backend_data *bed;
1516 /* If this symbol was mentioned in a non-ELF file, try to set
1517 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
1518 permit a non-ELF file to correctly refer to a symbol defined in
1519 an ELF dynamic object. */
1520 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
1522 if (h->root.type != bfd_link_hash_defined
1523 && h->root.type != bfd_link_hash_defweak)
1524 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
1527 if (bfd_get_flavour (h->root.u.def.section->owner)
1528 == bfd_target_elf_flavour)
1529 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
1531 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
1534 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1535 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
1537 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
1545 /* If -Bsymbolic was used (which means to bind references to global
1546 symbols to the definition within the shared object), and this
1547 symbol was defined in a regular object, then it actually doesn't
1548 need a PLT entry. */
1549 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
1550 && eif->info->shared
1551 && eif->info->symbolic
1552 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
1553 h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT;
1555 /* If this symbol does not require a PLT entry, and it is not
1556 defined by a dynamic object, or is not referenced by a regular
1557 object, ignore it. We do have to handle a weak defined symbol,
1558 even if no regular object refers to it, if we decided to add it
1559 to the dynamic symbol table. FIXME: Do we normally need to worry
1560 about symbols which are defined by one dynamic object and
1561 referenced by another one? */
1562 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
1563 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1564 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
1565 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
1566 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
1569 /* If we've already adjusted this symbol, don't do it again. This
1570 can happen via a recursive call. */
1571 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
1574 /* Don't look at this symbol again. Note that we must set this
1575 after checking the above conditions, because we may look at a
1576 symbol once, decide not to do anything, and then get called
1577 recursively later after REF_REGULAR is set below. */
1578 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
1580 /* If this is a weak definition, and we know a real definition, and
1581 the real symbol is not itself defined by a regular object file,
1582 then get a good value for the real definition. We handle the
1583 real symbol first, for the convenience of the backend routine.
1585 Note that there is a confusing case here. If the real definition
1586 is defined by a regular object file, we don't get the real symbol
1587 from the dynamic object, but we do get the weak symbol. If the
1588 processor backend uses a COPY reloc, then if some routine in the
1589 dynamic object changes the real symbol, we will not see that
1590 change in the corresponding weak symbol. This is the way other
1591 ELF linkers work as well, and seems to be a result of the shared
1594 I will clarify this issue. Most SVR4 shared libraries define the
1595 variable _timezone and define timezone as a weak synonym. The
1596 tzset call changes _timezone. If you write
1597 extern int timezone;
1599 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
1600 you might expect that, since timezone is a synonym for _timezone,
1601 the same number will print both times. However, if the processor
1602 backend uses a COPY reloc, then actually timezone will be copied
1603 into your process image, and, since you define _timezone
1604 yourself, _timezone will not. Thus timezone and _timezone will
1605 wind up at different memory locations. The tzset call will set
1606 _timezone, leaving timezone unchanged. */
1608 if (h->weakdef != NULL)
1610 struct elf_link_hash_entry *weakdef;
1612 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1613 || h->root.type == bfd_link_hash_defweak);
1614 weakdef = h->weakdef;
1615 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
1616 || weakdef->root.type == bfd_link_hash_defweak);
1617 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
1618 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
1620 /* This symbol is defined by a regular object file, so we
1621 will not do anything special. Clear weakdef for the
1622 convenience of the processor backend. */
1627 /* There is an implicit reference by a regular object file
1628 via the weak symbol. */
1629 weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
1630 if (! elf_adjust_dynamic_symbol (weakdef, (PTR) eif))
1635 dynobj = elf_hash_table (eif->info)->dynobj;
1636 bed = get_elf_backend_data (dynobj);
1637 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
1646 /* Final phase of ELF linker. */
1648 /* A structure we use to avoid passing large numbers of arguments. */
1650 struct elf_final_link_info
1652 /* General link information. */
1653 struct bfd_link_info *info;
1656 /* Symbol string table. */
1657 struct bfd_strtab_hash *symstrtab;
1658 /* .dynsym section. */
1659 asection *dynsym_sec;
1660 /* .hash section. */
1662 /* Buffer large enough to hold contents of any section. */
1664 /* Buffer large enough to hold external relocs of any section. */
1665 PTR external_relocs;
1666 /* Buffer large enough to hold internal relocs of any section. */
1667 Elf_Internal_Rela *internal_relocs;
1668 /* Buffer large enough to hold external local symbols of any input
1670 Elf_External_Sym *external_syms;
1671 /* Buffer large enough to hold internal local symbols of any input
1673 Elf_Internal_Sym *internal_syms;
1674 /* Array large enough to hold a symbol index for each local symbol
1675 of any input BFD. */
1677 /* Array large enough to hold a section pointer for each local
1678 symbol of any input BFD. */
1679 asection **sections;
1680 /* Buffer to hold swapped out symbols. */
1681 Elf_External_Sym *symbuf;
1682 /* Number of swapped out symbols in buffer. */
1683 size_t symbuf_count;
1684 /* Number of symbols which fit in symbuf. */
1688 static boolean elf_link_output_sym
1689 PARAMS ((struct elf_final_link_info *, const char *,
1690 Elf_Internal_Sym *, asection *));
1691 static boolean elf_link_flush_output_syms
1692 PARAMS ((struct elf_final_link_info *));
1693 static boolean elf_link_output_extsym
1694 PARAMS ((struct elf_link_hash_entry *, PTR));
1695 static boolean elf_link_input_bfd
1696 PARAMS ((struct elf_final_link_info *, bfd *));
1697 static boolean elf_reloc_link_order
1698 PARAMS ((bfd *, struct bfd_link_info *, asection *,
1699 struct bfd_link_order *));
1701 /* This struct is used to pass information to routines called via
1702 elf_link_hash_traverse which must return failure. */
1704 struct elf_finfo_failed
1707 struct elf_final_link_info *finfo;
1710 /* Do the final step of an ELF link. */
1713 elf_bfd_final_link (abfd, info)
1715 struct bfd_link_info *info;
1719 struct elf_final_link_info finfo;
1720 register asection *o;
1721 register struct bfd_link_order *p;
1723 size_t max_contents_size;
1724 size_t max_external_reloc_size;
1725 size_t max_internal_reloc_count;
1726 size_t max_sym_count;
1728 Elf_Internal_Sym elfsym;
1730 Elf_Internal_Shdr *symtab_hdr;
1731 Elf_Internal_Shdr *symstrtab_hdr;
1732 struct elf_backend_data *bed = get_elf_backend_data (abfd);
1733 struct elf_finfo_failed eif;
1736 abfd->flags |= DYNAMIC;
1738 dynamic = elf_hash_table (info)->dynamic_sections_created;
1739 dynobj = elf_hash_table (info)->dynobj;
1742 finfo.output_bfd = abfd;
1743 finfo.symstrtab = elf_stringtab_init ();
1744 if (finfo.symstrtab == NULL)
1748 finfo.dynsym_sec = NULL;
1749 finfo.hash_sec = NULL;
1753 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
1754 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
1755 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
1757 finfo.contents = NULL;
1758 finfo.external_relocs = NULL;
1759 finfo.internal_relocs = NULL;
1760 finfo.external_syms = NULL;
1761 finfo.internal_syms = NULL;
1762 finfo.indices = NULL;
1763 finfo.sections = NULL;
1764 finfo.symbuf = NULL;
1765 finfo.symbuf_count = 0;
1767 /* Count up the number of relocations we will output for each output
1768 section, so that we know the sizes of the reloc sections. We
1769 also figure out some maximum sizes. */
1770 max_contents_size = 0;
1771 max_external_reloc_size = 0;
1772 max_internal_reloc_count = 0;
1774 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
1778 for (p = o->link_order_head; p != NULL; p = p->next)
1780 if (p->type == bfd_section_reloc_link_order
1781 || p->type == bfd_symbol_reloc_link_order)
1783 else if (p->type == bfd_indirect_link_order)
1787 sec = p->u.indirect.section;
1789 if (info->relocateable)
1790 o->reloc_count += sec->reloc_count;
1792 if (sec->_raw_size > max_contents_size)
1793 max_contents_size = sec->_raw_size;
1794 if (sec->_cooked_size > max_contents_size)
1795 max_contents_size = sec->_cooked_size;
1797 /* We are interested in just local symbols, not all
1799 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour)
1803 if (elf_bad_symtab (sec->owner))
1804 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
1805 / sizeof (Elf_External_Sym));
1807 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
1809 if (sym_count > max_sym_count)
1810 max_sym_count = sym_count;
1812 if ((sec->flags & SEC_RELOC) != 0)
1816 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
1817 if (ext_size > max_external_reloc_size)
1818 max_external_reloc_size = ext_size;
1819 if (sec->reloc_count > max_internal_reloc_count)
1820 max_internal_reloc_count = sec->reloc_count;
1826 if (o->reloc_count > 0)
1827 o->flags |= SEC_RELOC;
1830 /* Explicitly clear the SEC_RELOC flag. The linker tends to
1831 set it (this is probably a bug) and if it is set
1832 assign_section_numbers will create a reloc section. */
1833 o->flags &=~ SEC_RELOC;
1836 /* If the SEC_ALLOC flag is not set, force the section VMA to
1837 zero. This is done in elf_fake_sections as well, but forcing
1838 the VMA to 0 here will ensure that relocs against these
1839 sections are handled correctly. */
1840 if ((o->flags & SEC_ALLOC) == 0)
1844 /* Figure out the file positions for everything but the symbol table
1845 and the relocs. We set symcount to force assign_section_numbers
1846 to create a symbol table. */
1847 abfd->symcount = info->strip == strip_all ? 0 : 1;
1848 BFD_ASSERT (! abfd->output_has_begun);
1849 if (! _bfd_elf_compute_section_file_positions (abfd, info))
1852 /* That created the reloc sections. Set their sizes, and assign
1853 them file positions, and allocate some buffers. */
1854 for (o = abfd->sections; o != NULL; o = o->next)
1856 if ((o->flags & SEC_RELOC) != 0)
1858 Elf_Internal_Shdr *rel_hdr;
1859 register struct elf_link_hash_entry **p, **pend;
1861 rel_hdr = &elf_section_data (o)->rel_hdr;
1863 rel_hdr->sh_size = rel_hdr->sh_entsize * o->reloc_count;
1865 /* The contents field must last into write_object_contents,
1866 so we allocate it with bfd_alloc rather than malloc. */
1867 rel_hdr->contents = (PTR) bfd_alloc (abfd, rel_hdr->sh_size);
1868 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
1871 p = ((struct elf_link_hash_entry **)
1872 bfd_malloc (o->reloc_count
1873 * sizeof (struct elf_link_hash_entry *)));
1874 if (p == NULL && o->reloc_count != 0)
1876 elf_section_data (o)->rel_hashes = p;
1877 pend = p + o->reloc_count;
1878 for (; p < pend; p++)
1881 /* Use the reloc_count field as an index when outputting the
1887 _bfd_elf_assign_file_positions_for_relocs (abfd);
1889 /* We have now assigned file positions for all the sections except
1890 .symtab and .strtab. We start the .symtab section at the current
1891 file position, and write directly to it. We build the .strtab
1892 section in memory. */
1894 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1895 /* sh_name is set in prep_headers. */
1896 symtab_hdr->sh_type = SHT_SYMTAB;
1897 symtab_hdr->sh_flags = 0;
1898 symtab_hdr->sh_addr = 0;
1899 symtab_hdr->sh_size = 0;
1900 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
1901 /* sh_link is set in assign_section_numbers. */
1902 /* sh_info is set below. */
1903 /* sh_offset is set just below. */
1904 symtab_hdr->sh_addralign = 4; /* FIXME: system dependent? */
1906 off = elf_tdata (abfd)->next_file_pos;
1907 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
1909 /* Note that at this point elf_tdata (abfd)->next_file_pos is
1910 incorrect. We do not yet know the size of the .symtab section.
1911 We correct next_file_pos below, after we do know the size. */
1913 /* Allocate a buffer to hold swapped out symbols. This is to avoid
1914 continuously seeking to the right position in the file. */
1915 if (! info->keep_memory || max_sym_count < 20)
1916 finfo.symbuf_size = 20;
1918 finfo.symbuf_size = max_sym_count;
1919 finfo.symbuf = ((Elf_External_Sym *)
1920 bfd_malloc (finfo.symbuf_size * sizeof (Elf_External_Sym)));
1921 if (finfo.symbuf == NULL)
1924 /* Start writing out the symbol table. The first symbol is always a
1926 if (info->strip != strip_all || info->relocateable)
1928 elfsym.st_value = 0;
1931 elfsym.st_other = 0;
1932 elfsym.st_shndx = SHN_UNDEF;
1933 if (! elf_link_output_sym (&finfo, (const char *) NULL,
1934 &elfsym, bfd_und_section_ptr))
1939 /* Some standard ELF linkers do this, but we don't because it causes
1940 bootstrap comparison failures. */
1941 /* Output a file symbol for the output file as the second symbol.
1942 We output this even if we are discarding local symbols, although
1943 I'm not sure if this is correct. */
1944 elfsym.st_value = 0;
1946 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
1947 elfsym.st_other = 0;
1948 elfsym.st_shndx = SHN_ABS;
1949 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
1950 &elfsym, bfd_abs_section_ptr))
1954 /* Output a symbol for each section. We output these even if we are
1955 discarding local symbols, since they are used for relocs. These
1956 symbols have no names. We store the index of each one in the
1957 index field of the section, so that we can find it again when
1958 outputting relocs. */
1959 if (info->strip != strip_all || info->relocateable)
1961 elfsym.st_value = 0;
1963 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
1964 elfsym.st_other = 0;
1965 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
1967 o = section_from_elf_index (abfd, i);
1969 o->target_index = abfd->symcount;
1970 elfsym.st_shndx = i;
1971 if (! elf_link_output_sym (&finfo, (const char *) NULL,
1977 /* Allocate some memory to hold information read in from the input
1979 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
1980 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
1981 finfo.internal_relocs = ((Elf_Internal_Rela *)
1982 bfd_malloc (max_internal_reloc_count
1983 * sizeof (Elf_Internal_Rela)));
1984 finfo.external_syms = ((Elf_External_Sym *)
1985 bfd_malloc (max_sym_count
1986 * sizeof (Elf_External_Sym)));
1987 finfo.internal_syms = ((Elf_Internal_Sym *)
1988 bfd_malloc (max_sym_count
1989 * sizeof (Elf_Internal_Sym)));
1990 finfo.indices = (long *) bfd_malloc (max_sym_count * sizeof (long));
1991 finfo.sections = ((asection **)
1992 bfd_malloc (max_sym_count * sizeof (asection *)));
1993 if ((finfo.contents == NULL && max_contents_size != 0)
1994 || (finfo.external_relocs == NULL && max_external_reloc_size != 0)
1995 || (finfo.internal_relocs == NULL && max_internal_reloc_count != 0)
1996 || (finfo.external_syms == NULL && max_sym_count != 0)
1997 || (finfo.internal_syms == NULL && max_sym_count != 0)
1998 || (finfo.indices == NULL && max_sym_count != 0)
1999 || (finfo.sections == NULL && max_sym_count != 0))
2002 /* Since ELF permits relocations to be against local symbols, we
2003 must have the local symbols available when we do the relocations.
2004 Since we would rather only read the local symbols once, and we
2005 would rather not keep them in memory, we handle all the
2006 relocations for a single input file at the same time.
2008 Unfortunately, there is no way to know the total number of local
2009 symbols until we have seen all of them, and the local symbol
2010 indices precede the global symbol indices. This means that when
2011 we are generating relocateable output, and we see a reloc against
2012 a global symbol, we can not know the symbol index until we have
2013 finished examining all the local symbols to see which ones we are
2014 going to output. To deal with this, we keep the relocations in
2015 memory, and don't output them until the end of the link. This is
2016 an unfortunate waste of memory, but I don't see a good way around
2017 it. Fortunately, it only happens when performing a relocateable
2018 link, which is not the common case. FIXME: If keep_memory is set
2019 we could write the relocs out and then read them again; I don't
2020 know how bad the memory loss will be. */
2022 for (sub = info->input_bfds; sub != NULL; sub = sub->next)
2023 sub->output_has_begun = false;
2024 for (o = abfd->sections; o != NULL; o = o->next)
2026 for (p = o->link_order_head; p != NULL; p = p->next)
2028 if (p->type == bfd_indirect_link_order
2029 && (bfd_get_flavour (p->u.indirect.section->owner)
2030 == bfd_target_elf_flavour))
2032 sub = p->u.indirect.section->owner;
2033 if (! sub->output_has_begun)
2035 if (! elf_link_input_bfd (&finfo, sub))
2037 sub->output_has_begun = true;
2040 else if (p->type == bfd_section_reloc_link_order
2041 || p->type == bfd_symbol_reloc_link_order)
2043 if (! elf_reloc_link_order (abfd, info, o, p))
2048 if (! _bfd_default_link_order (abfd, info, o, p))
2054 /* That wrote out all the local symbols. Finish up the symbol table
2055 with the global symbols. */
2057 /* The sh_info field records the index of the first non local
2059 symtab_hdr->sh_info = abfd->symcount;
2061 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info = 1;
2063 /* We get the global symbols from the hash table. */
2066 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
2071 /* Flush all symbols to the file. */
2072 if (! elf_link_flush_output_syms (&finfo))
2075 /* Now we know the size of the symtab section. */
2076 off += symtab_hdr->sh_size;
2078 /* Finish up and write out the symbol string table (.strtab)
2080 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
2081 /* sh_name was set in prep_headers. */
2082 symstrtab_hdr->sh_type = SHT_STRTAB;
2083 symstrtab_hdr->sh_flags = 0;
2084 symstrtab_hdr->sh_addr = 0;
2085 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
2086 symstrtab_hdr->sh_entsize = 0;
2087 symstrtab_hdr->sh_link = 0;
2088 symstrtab_hdr->sh_info = 0;
2089 /* sh_offset is set just below. */
2090 symstrtab_hdr->sh_addralign = 1;
2092 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
2093 elf_tdata (abfd)->next_file_pos = off;
2095 if (abfd->symcount > 0)
2097 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
2098 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
2102 /* Adjust the relocs to have the correct symbol indices. */
2103 for (o = abfd->sections; o != NULL; o = o->next)
2105 struct elf_link_hash_entry **rel_hash;
2106 Elf_Internal_Shdr *rel_hdr;
2108 if ((o->flags & SEC_RELOC) == 0)
2111 rel_hash = elf_section_data (o)->rel_hashes;
2112 rel_hdr = &elf_section_data (o)->rel_hdr;
2113 for (i = 0; i < o->reloc_count; i++, rel_hash++)
2115 if (*rel_hash == NULL)
2118 BFD_ASSERT ((*rel_hash)->indx >= 0);
2120 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
2122 Elf_External_Rel *erel;
2123 Elf_Internal_Rel irel;
2125 erel = (Elf_External_Rel *) rel_hdr->contents + i;
2126 elf_swap_reloc_in (abfd, erel, &irel);
2127 irel.r_info = ELF_R_INFO ((*rel_hash)->indx,
2128 ELF_R_TYPE (irel.r_info));
2129 elf_swap_reloc_out (abfd, &irel, erel);
2133 Elf_External_Rela *erela;
2134 Elf_Internal_Rela irela;
2136 BFD_ASSERT (rel_hdr->sh_entsize
2137 == sizeof (Elf_External_Rela));
2139 erela = (Elf_External_Rela *) rel_hdr->contents + i;
2140 elf_swap_reloca_in (abfd, erela, &irela);
2141 irela.r_info = ELF_R_INFO ((*rel_hash)->indx,
2142 ELF_R_TYPE (irela.r_info));
2143 elf_swap_reloca_out (abfd, &irela, erela);
2147 /* Set the reloc_count field to 0 to prevent write_relocs from
2148 trying to swap the relocs out itself. */
2152 /* If we are linking against a dynamic object, or generating a
2153 shared library, finish up the dynamic linking information. */
2156 Elf_External_Dyn *dyncon, *dynconend;
2158 /* Fix up .dynamic entries. */
2159 o = bfd_get_section_by_name (dynobj, ".dynamic");
2160 BFD_ASSERT (o != NULL);
2162 dyncon = (Elf_External_Dyn *) o->contents;
2163 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
2164 for (; dyncon < dynconend; dyncon++)
2166 Elf_Internal_Dyn dyn;
2170 elf_swap_dyn_in (dynobj, dyncon, &dyn);
2177 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
2178 magic _init and _fini symbols. This is pretty ugly,
2179 but we are compatible. */
2187 struct elf_link_hash_entry *h;
2189 h = elf_link_hash_lookup (elf_hash_table (info), name,
2190 false, false, true);
2192 && (h->root.type == bfd_link_hash_defined
2193 || h->root.type == bfd_link_hash_defweak))
2195 dyn.d_un.d_val = h->root.u.def.value;
2196 o = h->root.u.def.section;
2197 if (o->output_section != NULL)
2198 dyn.d_un.d_val += (o->output_section->vma
2199 + o->output_offset);
2202 /* The symbol is imported from another shared
2203 library and does not apply to this one. */
2207 elf_swap_dyn_out (dynobj, &dyn, dyncon);
2221 o = bfd_get_section_by_name (abfd, name);
2222 BFD_ASSERT (o != NULL);
2223 dyn.d_un.d_ptr = o->vma;
2224 elf_swap_dyn_out (dynobj, &dyn, dyncon);
2231 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
2236 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
2238 Elf_Internal_Shdr *hdr;
2240 hdr = elf_elfsections (abfd)[i];
2241 if (hdr->sh_type == type
2242 && (hdr->sh_flags & SHF_ALLOC) != 0)
2244 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
2245 dyn.d_un.d_val += hdr->sh_size;
2248 if (dyn.d_un.d_val == 0
2249 || hdr->sh_addr < dyn.d_un.d_val)
2250 dyn.d_un.d_val = hdr->sh_addr;
2254 elf_swap_dyn_out (dynobj, &dyn, dyncon);
2260 /* If we have created any dynamic sections, then output them. */
2263 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
2266 for (o = dynobj->sections; o != NULL; o = o->next)
2268 if ((o->flags & SEC_HAS_CONTENTS) == 0
2269 || o->_raw_size == 0)
2271 if ((o->flags & SEC_IN_MEMORY) == 0)
2273 /* At this point, we are only interested in sections
2274 created by elf_link_create_dynamic_sections. FIXME:
2275 This test is fragile. */
2278 if ((elf_section_data (o->output_section)->this_hdr.sh_type
2280 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
2282 if (! bfd_set_section_contents (abfd, o->output_section,
2283 o->contents, o->output_offset,
2291 /* The contents of the .dynstr section are actually in a
2293 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
2294 if (bfd_seek (abfd, off, SEEK_SET) != 0
2295 || ! _bfd_stringtab_emit (abfd,
2296 elf_hash_table (info)->dynstr))
2302 if (finfo.symstrtab != NULL)
2303 _bfd_stringtab_free (finfo.symstrtab);
2304 if (finfo.contents != NULL)
2305 free (finfo.contents);
2306 if (finfo.external_relocs != NULL)
2307 free (finfo.external_relocs);
2308 if (finfo.internal_relocs != NULL)
2309 free (finfo.internal_relocs);
2310 if (finfo.external_syms != NULL)
2311 free (finfo.external_syms);
2312 if (finfo.internal_syms != NULL)
2313 free (finfo.internal_syms);
2314 if (finfo.indices != NULL)
2315 free (finfo.indices);
2316 if (finfo.sections != NULL)
2317 free (finfo.sections);
2318 if (finfo.symbuf != NULL)
2319 free (finfo.symbuf);
2320 for (o = abfd->sections; o != NULL; o = o->next)
2322 if ((o->flags & SEC_RELOC) != 0
2323 && elf_section_data (o)->rel_hashes != NULL)
2324 free (elf_section_data (o)->rel_hashes);
2327 elf_tdata (abfd)->linker = true;
2332 if (finfo.symstrtab != NULL)
2333 _bfd_stringtab_free (finfo.symstrtab);
2334 if (finfo.contents != NULL)
2335 free (finfo.contents);
2336 if (finfo.external_relocs != NULL)
2337 free (finfo.external_relocs);
2338 if (finfo.internal_relocs != NULL)
2339 free (finfo.internal_relocs);
2340 if (finfo.external_syms != NULL)
2341 free (finfo.external_syms);
2342 if (finfo.internal_syms != NULL)
2343 free (finfo.internal_syms);
2344 if (finfo.indices != NULL)
2345 free (finfo.indices);
2346 if (finfo.sections != NULL)
2347 free (finfo.sections);
2348 if (finfo.symbuf != NULL)
2349 free (finfo.symbuf);
2350 for (o = abfd->sections; o != NULL; o = o->next)
2352 if ((o->flags & SEC_RELOC) != 0
2353 && elf_section_data (o)->rel_hashes != NULL)
2354 free (elf_section_data (o)->rel_hashes);
2360 /* Add a symbol to the output symbol table. */
2363 elf_link_output_sym (finfo, name, elfsym, input_sec)
2364 struct elf_final_link_info *finfo;
2366 Elf_Internal_Sym *elfsym;
2367 asection *input_sec;
2369 boolean (*output_symbol_hook) PARAMS ((bfd *,
2370 struct bfd_link_info *info,
2375 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
2376 elf_backend_link_output_symbol_hook;
2377 if (output_symbol_hook != NULL)
2379 if (! ((*output_symbol_hook)
2380 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
2384 if (name == (const char *) NULL || *name == '\0')
2385 elfsym->st_name = 0;
2388 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
2391 if (elfsym->st_name == (unsigned long) -1)
2395 if (finfo->symbuf_count >= finfo->symbuf_size)
2397 if (! elf_link_flush_output_syms (finfo))
2401 elf_swap_symbol_out (finfo->output_bfd, elfsym,
2402 (PTR) (finfo->symbuf + finfo->symbuf_count));
2403 ++finfo->symbuf_count;
2405 ++finfo->output_bfd->symcount;
2410 /* Flush the output symbols to the file. */
2413 elf_link_flush_output_syms (finfo)
2414 struct elf_final_link_info *finfo;
2416 if (finfo->symbuf_count > 0)
2418 Elf_Internal_Shdr *symtab;
2420 symtab = &elf_tdata (finfo->output_bfd)->symtab_hdr;
2422 if (bfd_seek (finfo->output_bfd, symtab->sh_offset + symtab->sh_size,
2424 || (bfd_write ((PTR) finfo->symbuf, finfo->symbuf_count,
2425 sizeof (Elf_External_Sym), finfo->output_bfd)
2426 != finfo->symbuf_count * sizeof (Elf_External_Sym)))
2429 symtab->sh_size += finfo->symbuf_count * sizeof (Elf_External_Sym);
2431 finfo->symbuf_count = 0;
2437 /* Add an external symbol to the symbol table. This is called from
2438 the hash table traversal routine. */
2441 elf_link_output_extsym (h, data)
2442 struct elf_link_hash_entry *h;
2445 struct elf_finfo_failed *eif = (struct elf_finfo_failed *) data;
2446 struct elf_final_link_info *finfo = eif->finfo;
2448 Elf_Internal_Sym sym;
2449 asection *input_sec;
2451 /* If we are not creating a shared library, and this symbol is
2452 referenced by a shared library but is not defined anywhere, then
2453 warn that it is undefined. If we do not do this, the runtime
2454 linker will complain that the symbol is undefined when the
2455 program is run. We don't have to worry about symbols that are
2456 referenced by regular files, because we will already have issued
2457 warnings for them. */
2458 if (! finfo->info->relocateable
2459 && ! finfo->info->shared
2460 && h->root.type == bfd_link_hash_undefined
2461 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
2462 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
2464 if (! ((*finfo->info->callbacks->undefined_symbol)
2465 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
2466 (asection *) NULL, 0)))
2473 /* We don't want to output symbols that have never been mentioned by
2474 a regular file, or that we have been told to strip. However, if
2475 h->indx is set to -2, the symbol is used by a reloc and we must
2479 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2480 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
2481 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
2482 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
2484 else if (finfo->info->strip == strip_all
2485 || (finfo->info->strip == strip_some
2486 && bfd_hash_lookup (finfo->info->keep_hash,
2487 h->root.root.string,
2488 false, false) == NULL))
2493 /* If we're stripping it, and it's not a dynamic symbol, there's
2494 nothing else to do. */
2495 if (strip && h->dynindx == -1)
2499 sym.st_size = h->size;
2501 if (h->root.type == bfd_link_hash_undefweak
2502 || h->root.type == bfd_link_hash_defweak)
2503 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
2505 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
2507 switch (h->root.type)
2510 case bfd_link_hash_new:
2514 case bfd_link_hash_undefined:
2515 input_sec = bfd_und_section_ptr;
2516 sym.st_shndx = SHN_UNDEF;
2519 case bfd_link_hash_undefweak:
2520 input_sec = bfd_und_section_ptr;
2521 sym.st_shndx = SHN_UNDEF;
2524 case bfd_link_hash_defined:
2525 case bfd_link_hash_defweak:
2527 input_sec = h->root.u.def.section;
2528 if (input_sec->output_section != NULL)
2531 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
2532 input_sec->output_section);
2533 if (sym.st_shndx == (unsigned short) -1)
2539 /* ELF symbols in relocateable files are section relative,
2540 but in nonrelocateable files they are virtual
2542 sym.st_value = h->root.u.def.value + input_sec->output_offset;
2543 if (! finfo->info->relocateable)
2544 sym.st_value += input_sec->output_section->vma;
2548 BFD_ASSERT ((bfd_get_flavour (input_sec->owner)
2549 == bfd_target_elf_flavour)
2550 && elf_elfheader (input_sec->owner)->e_type == ET_DYN);
2551 sym.st_shndx = SHN_UNDEF;
2552 input_sec = bfd_und_section_ptr;
2557 case bfd_link_hash_common:
2558 input_sec = bfd_com_section_ptr;
2559 sym.st_shndx = SHN_COMMON;
2560 sym.st_value = 1 << h->root.u.c.p->alignment_power;
2563 case bfd_link_hash_indirect:
2564 case bfd_link_hash_warning:
2565 /* We can't represent these symbols in ELF. A warning symbol
2566 may have come from a .gnu.warning.SYMBOL section anyhow. We
2567 just put the target symbol in the hash table. If the target
2568 symbol does not really exist, don't do anything. */
2569 if (h->root.u.i.link->type == bfd_link_hash_new)
2571 return (elf_link_output_extsym
2572 ((struct elf_link_hash_entry *) h->root.u.i.link, data));
2575 /* If this symbol should be put in the .dynsym section, then put it
2576 there now. We have already know the symbol index. We also fill
2577 in the entry in the .hash section. */
2578 if (h->dynindx != -1
2579 && elf_hash_table (finfo->info)->dynamic_sections_created)
2581 struct elf_backend_data *bed;
2584 bfd_byte *bucketpos;
2587 sym.st_name = h->dynstr_index;
2589 /* Give the processor backend a chance to tweak the symbol
2590 value, and also to finish up anything that needs to be done
2592 bed = get_elf_backend_data (finfo->output_bfd);
2593 if (! ((*bed->elf_backend_finish_dynamic_symbol)
2594 (finfo->output_bfd, finfo->info, h, &sym)))
2600 elf_swap_symbol_out (finfo->output_bfd, &sym,
2601 (PTR) (((Elf_External_Sym *)
2602 finfo->dynsym_sec->contents)
2605 bucketcount = elf_hash_table (finfo->info)->bucketcount;
2606 bucket = (bfd_elf_hash ((const unsigned char *) h->root.root.string)
2608 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
2609 + (bucket + 2) * (ARCH_SIZE / 8));
2610 chain = get_word (finfo->output_bfd, bucketpos);
2611 put_word (finfo->output_bfd, h->dynindx, bucketpos);
2612 put_word (finfo->output_bfd, chain,
2613 ((bfd_byte *) finfo->hash_sec->contents
2614 + (bucketcount + 2 + h->dynindx) * (ARCH_SIZE / 8)));
2617 /* If we're stripping it, then it was just a dynamic symbol, and
2618 there's nothing else to do. */
2622 h->indx = finfo->output_bfd->symcount;
2624 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
2633 /* Link an input file into the linker output file. This function
2634 handles all the sections and relocations of the input file at once.
2635 This is so that we only have to read the local symbols once, and
2636 don't have to keep them in memory. */
2639 elf_link_input_bfd (finfo, input_bfd)
2640 struct elf_final_link_info *finfo;
2643 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
2644 bfd *, asection *, bfd_byte *,
2645 Elf_Internal_Rela *,
2646 Elf_Internal_Sym *, asection **));
2648 Elf_Internal_Shdr *symtab_hdr;
2651 Elf_External_Sym *esym;
2652 Elf_External_Sym *esymend;
2653 Elf_Internal_Sym *isym;
2655 asection **ppsection;
2658 output_bfd = finfo->output_bfd;
2660 get_elf_backend_data (output_bfd)->elf_backend_relocate_section;
2662 /* If this is a dynamic object, we don't want to do anything here:
2663 we don't want the local symbols, and we don't want the section
2665 if (elf_elfheader (input_bfd)->e_type == ET_DYN)
2668 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2669 if (elf_bad_symtab (input_bfd))
2671 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
2676 locsymcount = symtab_hdr->sh_info;
2677 extsymoff = symtab_hdr->sh_info;
2680 /* Read the local symbols. */
2682 && (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
2683 || (bfd_read (finfo->external_syms, sizeof (Elf_External_Sym),
2684 locsymcount, input_bfd)
2685 != locsymcount * sizeof (Elf_External_Sym))))
2688 /* Swap in the local symbols and write out the ones which we know
2689 are going into the output file. */
2690 esym = finfo->external_syms;
2691 esymend = esym + locsymcount;
2692 isym = finfo->internal_syms;
2693 pindex = finfo->indices;
2694 ppsection = finfo->sections;
2695 for (; esym < esymend; esym++, isym++, pindex++, ppsection++)
2699 Elf_Internal_Sym osym;
2701 elf_swap_symbol_in (input_bfd, esym, isym);
2704 if (elf_bad_symtab (input_bfd))
2706 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
2713 if (isym->st_shndx == SHN_UNDEF)
2714 isec = bfd_und_section_ptr;
2715 else if (isym->st_shndx > 0 && isym->st_shndx < SHN_LORESERVE)
2716 isec = section_from_elf_index (input_bfd, isym->st_shndx);
2717 else if (isym->st_shndx == SHN_ABS)
2718 isec = bfd_abs_section_ptr;
2719 else if (isym->st_shndx == SHN_COMMON)
2720 isec = bfd_com_section_ptr;
2729 /* Don't output the first, undefined, symbol. */
2730 if (esym == finfo->external_syms)
2733 /* If we are stripping all symbols, we don't want to output this
2735 if (finfo->info->strip == strip_all)
2738 /* We never output section symbols. Instead, we use the section
2739 symbol of the corresponding section in the output file. */
2740 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
2743 /* If we are discarding all local symbols, we don't want to
2744 output this one. If we are generating a relocateable output
2745 file, then some of the local symbols may be required by
2746 relocs; we output them below as we discover that they are
2748 if (finfo->info->discard == discard_all)
2751 /* Get the name of the symbol. */
2752 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
2757 /* See if we are discarding symbols with this name. */
2758 if ((finfo->info->strip == strip_some
2759 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
2761 || (finfo->info->discard == discard_l
2762 && strncmp (name, finfo->info->lprefix,
2763 finfo->info->lprefix_len) == 0))
2766 /* If we get here, we are going to output this symbol. */
2770 /* Adjust the section index for the output file. */
2771 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
2772 isec->output_section);
2773 if (osym.st_shndx == (unsigned short) -1)
2776 *pindex = output_bfd->symcount;
2778 /* ELF symbols in relocateable files are section relative, but
2779 in executable files they are virtual addresses. Note that
2780 this code assumes that all ELF sections have an associated
2781 BFD section with a reasonable value for output_offset; below
2782 we assume that they also have a reasonable value for
2783 output_section. Any special sections must be set up to meet
2784 these requirements. */
2785 osym.st_value += isec->output_offset;
2786 if (! finfo->info->relocateable)
2787 osym.st_value += isec->output_section->vma;
2789 if (! elf_link_output_sym (finfo, name, &osym, isec))
2793 /* Relocate the contents of each section. */
2794 for (o = input_bfd->sections; o != NULL; o = o->next)
2796 if ((o->flags & SEC_HAS_CONTENTS) == 0)
2799 if ((o->flags & SEC_IN_MEMORY) != 0
2800 && input_bfd == elf_hash_table (finfo->info)->dynobj)
2802 /* Section was created by elf_link_create_dynamic_sections.
2803 FIXME: This test is fragile. */
2807 /* Read the contents of the section. */
2808 if (! bfd_get_section_contents (input_bfd, o, finfo->contents,
2809 (file_ptr) 0, o->_raw_size))
2812 if ((o->flags & SEC_RELOC) != 0)
2814 Elf_Internal_Rela *internal_relocs;
2816 /* Get the swapped relocs. */
2817 internal_relocs = elf_link_read_relocs (input_bfd, o,
2818 finfo->external_relocs,
2819 finfo->internal_relocs,
2821 if (internal_relocs == NULL
2822 && o->reloc_count > 0)
2825 /* Relocate the section by invoking a back end routine.
2827 The back end routine is responsible for adjusting the
2828 section contents as necessary, and (if using Rela relocs
2829 and generating a relocateable output file) adjusting the
2830 reloc addend as necessary.
2832 The back end routine does not have to worry about setting
2833 the reloc address or the reloc symbol index.
2835 The back end routine is given a pointer to the swapped in
2836 internal symbols, and can access the hash table entries
2837 for the external symbols via elf_sym_hashes (input_bfd).
2839 When generating relocateable output, the back end routine
2840 must handle STB_LOCAL/STT_SECTION symbols specially. The
2841 output symbol is going to be a section symbol
2842 corresponding to the output section, which will require
2843 the addend to be adjusted. */
2845 if (! (*relocate_section) (output_bfd, finfo->info,
2849 finfo->internal_syms,
2853 if (finfo->info->relocateable)
2855 Elf_Internal_Rela *irela;
2856 Elf_Internal_Rela *irelaend;
2857 struct elf_link_hash_entry **rel_hash;
2858 Elf_Internal_Shdr *input_rel_hdr;
2859 Elf_Internal_Shdr *output_rel_hdr;
2861 /* Adjust the reloc addresses and symbol indices. */
2863 irela = internal_relocs;
2864 irelaend = irela + o->reloc_count;
2865 rel_hash = (elf_section_data (o->output_section)->rel_hashes
2866 + o->output_section->reloc_count);
2867 for (; irela < irelaend; irela++, rel_hash++)
2869 unsigned long r_symndx;
2870 Elf_Internal_Sym *isym;
2873 irela->r_offset += o->output_offset;
2875 r_symndx = ELF_R_SYM (irela->r_info);
2880 if (r_symndx >= locsymcount
2881 || (elf_bad_symtab (input_bfd)
2882 && finfo->sections[r_symndx] == NULL))
2886 /* This is a reloc against a global symbol. We
2887 have not yet output all the local symbols, so
2888 we do not know the symbol index of any global
2889 symbol. We set the rel_hash entry for this
2890 reloc to point to the global hash table entry
2891 for this symbol. The symbol index is then
2892 set at the end of elf_bfd_final_link. */
2893 indx = r_symndx - extsymoff;
2894 *rel_hash = elf_sym_hashes (input_bfd)[indx];
2896 /* Setting the index to -2 tells
2897 elf_link_output_extsym that this symbol is
2899 BFD_ASSERT ((*rel_hash)->indx < 0);
2900 (*rel_hash)->indx = -2;
2905 /* This is a reloc against a local symbol. */
2908 isym = finfo->internal_syms + r_symndx;
2909 sec = finfo->sections[r_symndx];
2910 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
2912 /* I suppose the backend ought to fill in the
2913 section of any STT_SECTION symbol against a
2914 processor specific section. */
2915 if (sec != NULL && bfd_is_abs_section (sec))
2917 else if (sec == NULL || sec->owner == NULL)
2919 bfd_set_error (bfd_error_bad_value);
2924 r_symndx = sec->output_section->target_index;
2925 BFD_ASSERT (r_symndx != 0);
2930 if (finfo->indices[r_symndx] == -1)
2936 if (finfo->info->strip == strip_all)
2938 /* You can't do ld -r -s. */
2939 bfd_set_error (bfd_error_invalid_operation);
2943 /* This symbol was skipped earlier, but
2944 since it is needed by a reloc, we
2945 must output it now. */
2946 link = symtab_hdr->sh_link;
2947 name = bfd_elf_string_from_elf_section (input_bfd,
2953 osec = sec->output_section;
2955 _bfd_elf_section_from_bfd_section (output_bfd,
2957 if (isym->st_shndx == (unsigned short) -1)
2960 isym->st_value += sec->output_offset;
2961 if (! finfo->info->relocateable)
2962 isym->st_value += osec->vma;
2964 finfo->indices[r_symndx] = output_bfd->symcount;
2966 if (! elf_link_output_sym (finfo, name, isym, sec))
2970 r_symndx = finfo->indices[r_symndx];
2973 irela->r_info = ELF_R_INFO (r_symndx,
2974 ELF_R_TYPE (irela->r_info));
2977 /* Swap out the relocs. */
2978 input_rel_hdr = &elf_section_data (o)->rel_hdr;
2979 output_rel_hdr = &elf_section_data (o->output_section)->rel_hdr;
2980 BFD_ASSERT (output_rel_hdr->sh_entsize
2981 == input_rel_hdr->sh_entsize);
2982 irela = internal_relocs;
2983 irelaend = irela + o->reloc_count;
2984 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
2986 Elf_External_Rel *erel;
2988 erel = ((Elf_External_Rel *) output_rel_hdr->contents
2989 + o->output_section->reloc_count);
2990 for (; irela < irelaend; irela++, erel++)
2992 Elf_Internal_Rel irel;
2994 irel.r_offset = irela->r_offset;
2995 irel.r_info = irela->r_info;
2996 BFD_ASSERT (irela->r_addend == 0);
2997 elf_swap_reloc_out (output_bfd, &irel, erel);
3002 Elf_External_Rela *erela;
3004 BFD_ASSERT (input_rel_hdr->sh_entsize
3005 == sizeof (Elf_External_Rela));
3006 erela = ((Elf_External_Rela *) output_rel_hdr->contents
3007 + o->output_section->reloc_count);
3008 for (; irela < irelaend; irela++, erela++)
3009 elf_swap_reloca_out (output_bfd, irela, erela);
3012 o->output_section->reloc_count += o->reloc_count;
3016 /* Write out the modified section contents. */
3017 if (! bfd_set_section_contents (output_bfd, o->output_section,
3018 finfo->contents, o->output_offset,
3019 (o->_cooked_size != 0
3028 /* Generate a reloc when linking an ELF file. This is a reloc
3029 requested by the linker, and does come from any input file. This
3030 is used to build constructor and destructor tables when linking
3034 elf_reloc_link_order (output_bfd, info, output_section, link_order)
3036 struct bfd_link_info *info;
3037 asection *output_section;
3038 struct bfd_link_order *link_order;
3040 reloc_howto_type *howto;
3044 struct elf_link_hash_entry **rel_hash_ptr;
3045 Elf_Internal_Shdr *rel_hdr;
3047 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
3050 bfd_set_error (bfd_error_bad_value);
3054 addend = link_order->u.reloc.p->addend;
3056 /* Figure out the symbol index. */
3057 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
3058 + output_section->reloc_count);
3059 if (link_order->type == bfd_section_reloc_link_order)
3061 indx = link_order->u.reloc.p->u.section->target_index;
3062 BFD_ASSERT (indx != 0);
3063 *rel_hash_ptr = NULL;
3067 struct elf_link_hash_entry *h;
3069 /* Treat a reloc against a defined symbol as though it were
3070 actually against the section. */
3071 h = elf_link_hash_lookup (elf_hash_table (info),
3072 link_order->u.reloc.p->u.name,
3073 false, false, true);
3075 && (h->root.type == bfd_link_hash_defined
3076 || h->root.type == bfd_link_hash_defweak))
3080 section = h->root.u.def.section;
3081 indx = section->output_section->target_index;
3082 *rel_hash_ptr = NULL;
3083 /* It seems that we ought to add the symbol value to the
3084 addend here, but in practice it has already been added
3085 because it was passed to constructor_callback. */
3086 addend += section->output_section->vma + section->output_offset;
3090 /* Setting the index to -2 tells elf_link_output_extsym that
3091 this symbol is used by a reloc. */
3098 if (! ((*info->callbacks->unattached_reloc)
3099 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
3100 (asection *) NULL, (bfd_vma) 0)))
3106 /* If this is an inplace reloc, we must write the addend into the
3108 if (howto->partial_inplace && addend != 0)
3111 bfd_reloc_status_type rstat;
3115 size = bfd_get_reloc_size (howto);
3116 buf = (bfd_byte *) bfd_zmalloc (size);
3117 if (buf == (bfd_byte *) NULL)
3119 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
3125 case bfd_reloc_outofrange:
3127 case bfd_reloc_overflow:
3128 if (! ((*info->callbacks->reloc_overflow)
3130 (link_order->type == bfd_section_reloc_link_order
3131 ? bfd_section_name (output_bfd,
3132 link_order->u.reloc.p->u.section)
3133 : link_order->u.reloc.p->u.name),
3134 howto->name, addend, (bfd *) NULL, (asection *) NULL,
3142 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
3143 (file_ptr) link_order->offset, size);
3149 /* The address of a reloc is relative to the section in a
3150 relocateable file, and is a virtual address in an executable
3152 offset = link_order->offset;
3153 if (! info->relocateable)
3154 offset += output_section->vma;
3156 rel_hdr = &elf_section_data (output_section)->rel_hdr;
3158 if (rel_hdr->sh_type == SHT_REL)
3160 Elf_Internal_Rel irel;
3161 Elf_External_Rel *erel;
3163 irel.r_offset = offset;
3164 irel.r_info = ELF_R_INFO (indx, howto->type);
3165 erel = ((Elf_External_Rel *) rel_hdr->contents
3166 + output_section->reloc_count);
3167 elf_swap_reloc_out (output_bfd, &irel, erel);
3171 Elf_Internal_Rela irela;
3172 Elf_External_Rela *erela;
3174 irela.r_offset = offset;
3175 irela.r_info = ELF_R_INFO (indx, howto->type);
3176 irela.r_addend = addend;
3177 erela = ((Elf_External_Rela *) rel_hdr->contents
3178 + output_section->reloc_count);
3179 elf_swap_reloca_out (output_bfd, &irela, erela);
3182 ++output_section->reloc_count;
3188 /* Allocate a pointer to live in a linker created section. */
3191 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
3193 struct bfd_link_info *info;
3194 elf_linker_section_t *lsect;
3195 struct elf_link_hash_entry *h;
3196 const Elf_Internal_Rela *rel;
3198 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
3199 elf_linker_section_pointers_t *linker_section_ptr;
3200 unsigned long r_symndx = ELF_R_SYM (rel->r_info);;
3202 BFD_ASSERT (lsect != NULL);
3204 /* Is this a global symbol? */
3207 /* Has this symbol already been allocated, if so, our work is done */
3208 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
3213 ptr_linker_section_ptr = &h->linker_section_pointer;
3214 /* Make sure this symbol is output as a dynamic symbol. */
3215 if (h->dynindx == -1)
3217 if (! elf_link_record_dynamic_symbol (info, h))
3221 if (lsect->rel_section)
3222 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
3225 else /* Allocation of a pointer to a local symbol */
3227 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
3229 /* Allocate a table to hold the local symbols if first time */
3232 int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
3233 register unsigned int i;
3235 ptr = (elf_linker_section_pointers_t **)
3236 bfd_alloc (abfd, num_symbols * sizeof (elf_linker_section_pointers_t *));
3241 elf_local_ptr_offsets (abfd) = ptr;
3242 for (i = 0; i < num_symbols; i++)
3243 ptr[i] = (elf_linker_section_pointers_t *)0;
3246 /* Has this symbol already been allocated, if so, our work is done */
3247 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
3252 ptr_linker_section_ptr = &ptr[r_symndx];
3256 /* If we are generating a shared object, we need to
3257 output a R_<xxx>_RELATIVE reloc so that the
3258 dynamic linker can adjust this GOT entry. */
3259 BFD_ASSERT (lsect->rel_section != NULL);
3260 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
3264 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
3265 from internal memory. */
3266 BFD_ASSERT (ptr_linker_section_ptr != NULL);
3267 linker_section_ptr = (elf_linker_section_pointers_t *)
3268 bfd_alloc (abfd, sizeof (elf_linker_section_pointers_t));
3270 if (!linker_section_ptr)
3273 linker_section_ptr->next = *ptr_linker_section_ptr;
3274 linker_section_ptr->addend = rel->r_addend;
3275 linker_section_ptr->which = lsect->which;
3276 linker_section_ptr->written_address_p = false;
3277 *ptr_linker_section_ptr = linker_section_ptr;
3279 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
3281 linker_section_ptr->offset = lsect->section->_raw_size - lsect->hole_size;
3282 lsect->hole_offset += ARCH_SIZE / 8;
3283 lsect->sym_offset += ARCH_SIZE / 8;
3284 if (lsect->sym_hash) /* Bump up symbol value if needed */
3285 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
3288 linker_section_ptr->offset = lsect->section->_raw_size;
3290 lsect->section->_raw_size += ARCH_SIZE / 8;
3293 fprintf (stderr, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
3294 lsect->name, (long)linker_section_ptr->offset, (long)lsect->section->_raw_size);
3302 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
3305 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
3308 /* Fill in the address for a pointer generated in alinker section. */
3311 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h, relocation, rel, relative_reloc)
3314 struct bfd_link_info *info;
3315 elf_linker_section_t *lsect;
3316 struct elf_link_hash_entry *h;
3318 const Elf_Internal_Rela *rel;
3321 elf_linker_section_pointers_t *linker_section_ptr;
3323 BFD_ASSERT (lsect != NULL);
3325 if (h != NULL) /* global symbol */
3327 linker_section_ptr = _bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
3331 BFD_ASSERT (linker_section_ptr != NULL);
3333 if (! elf_hash_table (info)->dynamic_sections_created
3336 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
3338 /* This is actually a static link, or it is a
3339 -Bsymbolic link and the symbol is defined
3340 locally. We must initialize this entry in the
3343 When doing a dynamic link, we create a .rela.<xxx>
3344 relocation entry to initialize the value. This
3345 is done in the finish_dynamic_symbol routine. */
3346 if (!linker_section_ptr->written_address_p)
3348 linker_section_ptr->written_address_p = true;
3349 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
3350 lsect->section->contents + linker_section_ptr->offset);
3354 else /* local symbol */
3356 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
3357 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
3358 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
3359 linker_section_ptr = _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd)[r_symndx],
3363 BFD_ASSERT (linker_section_ptr != NULL);
3365 /* Write out pointer if it hasn't been rewritten out before */
3366 if (!linker_section_ptr->written_address_p)
3368 linker_section_ptr->written_address_p = true;
3369 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
3370 lsect->section->contents + linker_section_ptr->offset);
3374 asection *srel = lsect->rel_section;
3375 Elf_Internal_Rela outrel;
3377 /* We need to generate a relative reloc for the dynamic linker. */
3379 lsect->rel_section = srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
3382 BFD_ASSERT (srel != NULL);
3384 outrel.r_offset = (lsect->section->output_section->vma
3385 + lsect->section->output_offset
3386 + linker_section_ptr->offset);
3387 outrel.r_info = ELF_R_INFO (0, relative_reloc);
3388 outrel.r_addend = 0;
3389 elf_swap_reloca_out (output_bfd, &outrel,
3390 (((Elf_External_Rela *)
3391 lsect->section->contents)
3392 + lsect->section->reloc_count));
3393 ++lsect->section->reloc_count;
3398 relocation = (lsect->section->output_offset
3399 + linker_section_ptr->offset
3400 - lsect->hole_offset
3401 - lsect->sym_offset);
3404 fprintf (stderr, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
3405 lsect->name, (long)relocation, (long)relocation);
3408 /* Subtract out the addend, because it will get added back in by the normal
3410 return relocation - linker_section_ptr->addend;