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 boolean elf_export_symbol
27 PARAMS ((struct elf_link_hash_entry *, PTR));
28 static boolean elf_adjust_dynamic_symbol
29 PARAMS ((struct elf_link_hash_entry *, PTR));
31 /* This struct is used to pass information to routines called via
32 elf_link_hash_traverse which must return failure. */
34 struct elf_info_failed
37 struct bfd_link_info *info;
40 /* Given an ELF BFD, add symbols to the global hash table as
44 elf_bfd_link_add_symbols (abfd, info)
46 struct bfd_link_info *info;
48 switch (bfd_get_format (abfd))
51 return elf_link_add_object_symbols (abfd, info);
53 return elf_link_add_archive_symbols (abfd, info);
55 bfd_set_error (bfd_error_wrong_format);
61 /* Add symbols from an ELF archive file to the linker hash table. We
62 don't use _bfd_generic_link_add_archive_symbols because of a
63 problem which arises on UnixWare. The UnixWare libc.so is an
64 archive which includes an entry libc.so.1 which defines a bunch of
65 symbols. The libc.so archive also includes a number of other
66 object files, which also define symbols, some of which are the same
67 as those defined in libc.so.1. Correct linking requires that we
68 consider each object file in turn, and include it if it defines any
69 symbols we need. _bfd_generic_link_add_archive_symbols does not do
70 this; it looks through the list of undefined symbols, and includes
71 any object file which defines them. When this algorithm is used on
72 UnixWare, it winds up pulling in libc.so.1 early and defining a
73 bunch of symbols. This means that some of the other objects in the
74 archive are not included in the link, which is incorrect since they
75 precede libc.so.1 in the archive.
77 Fortunately, ELF archive handling is simpler than that done by
78 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
79 oddities. In ELF, if we find a symbol in the archive map, and the
80 symbol is currently undefined, we know that we must pull in that
83 Unfortunately, we do have to make multiple passes over the symbol
84 table until nothing further is resolved. */
87 elf_link_add_archive_symbols (abfd, info)
89 struct bfd_link_info *info;
92 boolean *defined = NULL;
93 boolean *included = NULL;
97 if (! bfd_has_map (abfd))
99 /* An empty archive is a special case. */
100 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
102 bfd_set_error (bfd_error_no_armap);
106 /* Keep track of all symbols we know to be already defined, and all
107 files we know to be already included. This is to speed up the
108 second and subsequent passes. */
109 c = bfd_ardata (abfd)->symdef_count;
112 defined = (boolean *) bfd_malloc (c * sizeof (boolean));
113 included = (boolean *) bfd_malloc (c * sizeof (boolean));
114 if (defined == (boolean *) NULL || included == (boolean *) NULL)
116 memset (defined, 0, c * sizeof (boolean));
117 memset (included, 0, c * sizeof (boolean));
119 symdefs = bfd_ardata (abfd)->symdefs;
132 symdefend = symdef + c;
133 for (i = 0; symdef < symdefend; symdef++, i++)
135 struct elf_link_hash_entry *h;
137 struct bfd_link_hash_entry *undefs_tail;
140 if (defined[i] || included[i])
142 if (symdef->file_offset == last)
148 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
149 false, false, false);
150 if (h == (struct elf_link_hash_entry *) NULL)
152 if (h->root.type != bfd_link_hash_undefined)
154 if (h->root.type != bfd_link_hash_undefweak)
159 /* We need to include this archive member. */
161 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
162 if (element == (bfd *) NULL)
165 if (! bfd_check_format (element, bfd_object))
168 /* Doublecheck that we have not included this object
169 already--it should be impossible, but there may be
170 something wrong with the archive. */
171 if (element->archive_pass != 0)
173 bfd_set_error (bfd_error_bad_value);
176 element->archive_pass = 1;
178 undefs_tail = info->hash->undefs_tail;
180 if (! (*info->callbacks->add_archive_element) (info, element,
183 if (! elf_link_add_object_symbols (element, info))
186 /* If there are any new undefined symbols, we need to make
187 another pass through the archive in order to see whether
188 they can be defined. FIXME: This isn't perfect, because
189 common symbols wind up on undefs_tail and because an
190 undefined symbol which is defined later on in this pass
191 does not require another pass. This isn't a bug, but it
192 does make the code less efficient than it could be. */
193 if (undefs_tail != info->hash->undefs_tail)
196 /* Look backward to mark all symbols from this object file
197 which we have already seen in this pass. */
201 included[mark] = true;
206 while (symdefs[mark].file_offset == symdef->file_offset);
208 /* We mark subsequent symbols from this object file as we go
209 on through the loop. */
210 last = symdef->file_offset;
221 if (defined != (boolean *) NULL)
223 if (included != (boolean *) NULL)
228 /* Add symbols from an ELF object file to the linker hash table. */
231 elf_link_add_object_symbols (abfd, info)
233 struct bfd_link_info *info;
235 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
236 const Elf_Internal_Sym *,
237 const char **, flagword *,
238 asection **, bfd_vma *));
239 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
240 asection *, const Elf_Internal_Rela *));
242 Elf_Internal_Shdr *hdr;
246 Elf_External_Sym *buf = NULL;
247 struct elf_link_hash_entry **sym_hash;
249 Elf_External_Dyn *dynbuf = NULL;
250 struct elf_link_hash_entry *weaks;
251 Elf_External_Sym *esym;
252 Elf_External_Sym *esymend;
254 add_symbol_hook = get_elf_backend_data (abfd)->elf_add_symbol_hook;
255 collect = get_elf_backend_data (abfd)->collect;
257 /* As a GNU extension, any input sections which are named
258 .gnu.warning.SYMBOL are treated as warning symbols for the given
259 symbol. This differs from .gnu.warning sections, which generate
260 warnings when they are included in an output file. */
265 for (s = abfd->sections; s != NULL; s = s->next)
269 name = bfd_get_section_name (abfd, s);
270 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
275 sz = bfd_section_size (abfd, s);
276 msg = (char *) bfd_alloc (abfd, sz);
280 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
283 if (! (_bfd_generic_link_add_one_symbol
285 name + sizeof ".gnu.warning." - 1,
286 BSF_WARNING, s, (bfd_vma) 0, msg, false, collect,
287 (struct bfd_link_hash_entry **) NULL)))
290 if (! info->relocateable)
292 /* Clobber the section size so that the warning does
293 not get copied into the output file. */
300 /* A stripped shared library might only have a dynamic symbol table,
301 not a regular symbol table. In that case we can still go ahead
302 and link using the dynamic symbol table. */
303 if (elf_onesymtab (abfd) == 0
304 && elf_dynsymtab (abfd) != 0)
306 elf_onesymtab (abfd) = elf_dynsymtab (abfd);
307 elf_tdata (abfd)->symtab_hdr = elf_tdata (abfd)->dynsymtab_hdr;
310 hdr = &elf_tdata (abfd)->symtab_hdr;
311 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
313 /* The sh_info field of the symtab header tells us where the
314 external symbols start. We don't care about the local symbols at
316 if (elf_bad_symtab (abfd))
318 extsymcount = symcount;
323 extsymcount = symcount - hdr->sh_info;
324 extsymoff = hdr->sh_info;
327 buf = ((Elf_External_Sym *)
328 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
329 if (buf == NULL && extsymcount != 0)
332 /* We store a pointer to the hash table entry for each external
334 sym_hash = ((struct elf_link_hash_entry **)
336 extsymcount * sizeof (struct elf_link_hash_entry *)));
337 if (sym_hash == NULL)
339 elf_sym_hashes (abfd) = sym_hash;
341 if (elf_elfheader (abfd)->e_type != ET_DYN)
345 /* If we are creating a shared library, create all the dynamic
346 sections immediately. We need to attach them to something,
347 so we attach them to this BFD, provided it is the right
348 format. FIXME: If there are no input BFD's of the same
349 format as the output, we can't make a shared library. */
351 && ! elf_hash_table (info)->dynamic_sections_created
352 && abfd->xvec == info->hash->creator)
354 if (! elf_link_create_dynamic_sections (abfd, info))
363 bfd_size_type oldsize;
364 bfd_size_type strindex;
368 /* You can't use -r against a dynamic object. Also, there's no
369 hope of using a dynamic object which does not exactly match
370 the format of the output file. */
371 if (info->relocateable
372 || info->hash->creator != abfd->xvec)
374 bfd_set_error (bfd_error_invalid_operation);
378 /* Find the name to use in a DT_NEEDED entry that refers to this
379 object. If the object has a DT_SONAME entry, we use it.
380 Otherwise, if the generic linker stuck something in
381 elf_dt_name, we use that. Otherwise, we just use the file
382 name. If the generic linker put a null string into
383 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
384 there is a DT_SONAME entry. */
386 name = bfd_get_filename (abfd);
387 if (elf_dt_name (abfd) != NULL)
389 name = elf_dt_name (abfd);
393 s = bfd_get_section_by_name (abfd, ".dynamic");
396 Elf_External_Dyn *extdyn;
397 Elf_External_Dyn *extdynend;
401 dynbuf = (Elf_External_Dyn *) bfd_malloc ((size_t) s->_raw_size);
405 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
406 (file_ptr) 0, s->_raw_size))
409 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
412 link = elf_elfsections (abfd)[elfsec]->sh_link;
415 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
416 for (; extdyn < extdynend; extdyn++)
418 Elf_Internal_Dyn dyn;
420 elf_swap_dyn_in (abfd, extdyn, &dyn);
421 if (dyn.d_tag == DT_SONAME)
423 name = bfd_elf_string_from_elf_section (abfd, link,
428 if (dyn.d_tag == DT_NEEDED)
430 struct bfd_link_needed_list *n, **pn;
433 n = ((struct bfd_link_needed_list *)
434 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
435 fnm = bfd_elf_string_from_elf_section (abfd, link,
437 if (n == NULL || fnm == NULL)
439 anm = bfd_alloc (abfd, strlen (fnm) + 1);
446 for (pn = &elf_hash_table (info)->needed;
458 /* We do not want to include any of the sections in a dynamic
459 object in the output file. We hack by simply clobbering the
460 list of sections in the BFD. This could be handled more
461 cleanly by, say, a new section flag; the existing
462 SEC_NEVER_LOAD flag is not the one we want, because that one
463 still implies that the section takes up space in the output
465 abfd->sections = NULL;
466 abfd->section_count = 0;
468 /* If this is the first dynamic object found in the link, create
469 the special sections required for dynamic linking. */
470 if (! elf_hash_table (info)->dynamic_sections_created)
472 if (! elf_link_create_dynamic_sections (abfd, info))
478 /* Add a DT_NEEDED entry for this dynamic object. */
479 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
480 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr, name,
482 if (strindex == (bfd_size_type) -1)
485 if (oldsize == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
488 Elf_External_Dyn *dyncon, *dynconend;
490 /* The hash table size did not change, which means that
491 the dynamic object name was already entered. If we
492 have already included this dynamic object in the
493 link, just ignore it. There is no reason to include
494 a particular dynamic object more than once. */
495 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
497 BFD_ASSERT (sdyn != NULL);
499 dyncon = (Elf_External_Dyn *) sdyn->contents;
500 dynconend = (Elf_External_Dyn *) (sdyn->contents +
502 for (; dyncon < dynconend; dyncon++)
504 Elf_Internal_Dyn dyn;
506 elf_swap_dyn_in (elf_hash_table (info)->dynobj, dyncon,
508 if (dyn.d_tag == DT_NEEDED
509 && dyn.d_un.d_val == strindex)
518 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
522 /* Save the SONAME, if there is one, because sometimes the
523 linker emulation code will need to know it. */
525 name = bfd_get_filename (abfd);
526 elf_dt_name (abfd) = name;
530 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
532 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
533 != extsymcount * sizeof (Elf_External_Sym)))
538 esymend = buf + extsymcount;
539 for (esym = buf; esym < esymend; esym++, sym_hash++)
541 Elf_Internal_Sym sym;
547 struct elf_link_hash_entry *h;
549 boolean size_change_ok, type_change_ok;
552 elf_swap_symbol_in (abfd, esym, &sym);
554 flags = BSF_NO_FLAGS;
556 value = sym.st_value;
559 bind = ELF_ST_BIND (sym.st_info);
560 if (bind == STB_LOCAL)
562 /* This should be impossible, since ELF requires that all
563 global symbols follow all local symbols, and that sh_info
564 point to the first global symbol. Unfortunatealy, Irix 5
568 else if (bind == STB_GLOBAL)
570 if (sym.st_shndx != SHN_UNDEF
571 && sym.st_shndx != SHN_COMMON)
576 else if (bind == STB_WEAK)
580 /* Leave it up to the processor backend. */
583 if (sym.st_shndx == SHN_UNDEF)
584 sec = bfd_und_section_ptr;
585 else if (sym.st_shndx > 0 && sym.st_shndx < SHN_LORESERVE)
587 sec = section_from_elf_index (abfd, sym.st_shndx);
591 sec = bfd_abs_section_ptr;
593 else if (sym.st_shndx == SHN_ABS)
594 sec = bfd_abs_section_ptr;
595 else if (sym.st_shndx == SHN_COMMON)
597 sec = bfd_com_section_ptr;
598 /* What ELF calls the size we call the value. What ELF
599 calls the value we call the alignment. */
604 /* Leave it up to the processor backend. */
607 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
608 if (name == (const char *) NULL)
613 if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
617 /* The hook function sets the name to NULL if this symbol
618 should be skipped for some reason. */
619 if (name == (const char *) NULL)
623 /* Sanity check that all possibilities were handled. */
624 if (sec == (asection *) NULL)
626 bfd_set_error (bfd_error_bad_value);
630 if (bfd_is_und_section (sec)
631 || bfd_is_com_section (sec))
636 size_change_ok = false;
637 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
638 if (info->hash->creator->flavour == bfd_target_elf_flavour)
640 /* We need to look up the symbol now in order to get some of
641 the dynamic object handling right. We pass the hash
642 table entry in to _bfd_generic_link_add_one_symbol so
643 that it does not have to look it up again. */
644 if (! bfd_is_und_section (sec))
645 h = elf_link_hash_lookup (elf_hash_table (info), name,
648 h = ((struct elf_link_hash_entry *)
649 bfd_wrapped_link_hash_lookup (abfd, info, name, true,
655 if (h->root.type == bfd_link_hash_new)
656 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
658 while (h->root.type == bfd_link_hash_indirect
659 || h->root.type == bfd_link_hash_warning)
660 h = (struct elf_link_hash_entry *) h->root.u.i.link;
662 /* It's OK to change the type if it used to be a weak
664 if (h->root.type == bfd_link_hash_defweak
665 || h->root.type == bfd_link_hash_undefweak)
666 type_change_ok = true;
668 /* It's OK to change the size if it used to be a weak
669 definition, or if it used to be undefined, or if we will
670 be overriding an old definition. */
672 || h->root.type == bfd_link_hash_undefined)
673 size_change_ok = true;
675 /* If we are looking at a dynamic object, and this is a
676 definition, we need to see if it has already been defined
677 by some other object. If it has, we want to use the
678 existing definition, and we do not want to report a
679 multiple symbol definition error; we do this by
680 clobbering sec to be bfd_und_section_ptr. We treat a
681 common symbol as a definition if the symbol in the shared
682 library is a function, since common symbols always
683 represent variables; this can cause confusion in
684 principle, but any such confusion would seem to indicate
685 an erroneous program or shared library. */
686 if (dynamic && definition)
688 if (h->root.type == bfd_link_hash_defined
689 || h->root.type == bfd_link_hash_defweak
690 || (h->root.type == bfd_link_hash_common
692 || ELF_ST_TYPE (sym.st_info) == STT_FUNC)))
694 sec = bfd_und_section_ptr;
696 size_change_ok = true;
697 if (h->root.type == bfd_link_hash_common)
698 type_change_ok = true;
702 /* Similarly, if we are not looking at a dynamic object, and
703 we have a definition, we want to override any definition
704 we may have from a dynamic object. Symbols from regular
705 files always take precedence over symbols from dynamic
706 objects, even if they are defined after the dynamic
707 object in the link. */
710 || (bfd_is_com_section (sec)
711 && (h->root.type == bfd_link_hash_defweak
712 || h->type == STT_FUNC)))
713 && (h->root.type == bfd_link_hash_defined
714 || h->root.type == bfd_link_hash_defweak)
715 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
716 && (bfd_get_flavour (h->root.u.def.section->owner)
717 == bfd_target_elf_flavour)
718 && (elf_elfheader (h->root.u.def.section->owner)->e_type
721 /* Change the hash table entry to undefined, and let
722 _bfd_generic_link_add_one_symbol do the right thing
723 with the new definition. */
724 h->root.type = bfd_link_hash_undefined;
725 h->root.u.undef.abfd = h->root.u.def.section->owner;
726 size_change_ok = true;
727 if (bfd_is_com_section (sec))
728 type_change_ok = true;
732 if (! (_bfd_generic_link_add_one_symbol
733 (info, abfd, name, flags, sec, value, (const char *) NULL,
734 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
738 while (h->root.type == bfd_link_hash_indirect
739 || h->root.type == bfd_link_hash_warning)
740 h = (struct elf_link_hash_entry *) h->root.u.i.link;
746 && (flags & BSF_WEAK) != 0
747 && ELF_ST_TYPE (sym.st_info) != STT_FUNC
748 && info->hash->creator->flavour == bfd_target_elf_flavour
749 && h->weakdef == NULL)
751 /* Keep a list of all weak defined non function symbols from
752 a dynamic object, using the weakdef field. Later in this
753 function we will set the weakdef field to the correct
754 value. We only put non-function symbols from dynamic
755 objects on this list, because that happens to be the only
756 time we need to know the normal symbol corresponding to a
757 weak symbol, and the information is time consuming to
758 figure out. If the weakdef field is not already NULL,
759 then this symbol was already defined by some previous
760 dynamic object, and we will be using that previous
761 definition anyhow. */
768 /* Get the alignment of a common symbol. */
769 if (sym.st_shndx == SHN_COMMON
770 && h->root.type == bfd_link_hash_common)
771 h->root.u.c.p->alignment_power = bfd_log2 (sym.st_value);
773 if (info->hash->creator->flavour == bfd_target_elf_flavour)
779 /* Remember the symbol size and type. */
781 && (definition || h->size == 0))
783 if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
784 (*_bfd_error_handler)
785 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
786 name, (unsigned long) h->size, (unsigned long) sym.st_size,
787 bfd_get_filename (abfd));
789 h->size = sym.st_size;
791 if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
792 && (definition || h->type == STT_NOTYPE))
794 if (h->type != STT_NOTYPE
795 && h->type != ELF_ST_TYPE (sym.st_info)
797 (*_bfd_error_handler)
798 ("Warning: type of symbol `%s' changed from %d to %d in %s",
799 name, h->type, ELF_ST_TYPE (sym.st_info),
800 bfd_get_filename (abfd));
802 h->type = ELF_ST_TYPE (sym.st_info);
805 if (sym.st_other != 0
806 && (definition || h->other == 0))
807 h->other = sym.st_other;
809 /* Set a flag in the hash table entry indicating the type of
810 reference or definition we just found. Keep a count of
811 the number of dynamic symbols we find. A dynamic symbol
812 is one which is referenced or defined by both a regular
813 object and a shared object. */
814 old_flags = h->elf_link_hash_flags;
819 new_flag = ELF_LINK_HASH_REF_REGULAR;
821 new_flag = ELF_LINK_HASH_DEF_REGULAR;
823 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
824 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
830 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
832 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
833 if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
834 | ELF_LINK_HASH_REF_REGULAR)) != 0
835 || (h->weakdef != NULL
837 && h->weakdef->dynindx != -1))
841 h->elf_link_hash_flags |= new_flag;
842 if (dynsym && h->dynindx == -1)
844 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
846 if (h->weakdef != NULL
848 && h->weakdef->dynindx == -1)
850 if (! _bfd_elf_link_record_dynamic_symbol (info,
858 /* Now set the weakdefs field correctly for all the weak defined
859 symbols we found. The only way to do this is to search all the
860 symbols. Since we only need the information for non functions in
861 dynamic objects, that's the only time we actually put anything on
862 the list WEAKS. We need this information so that if a regular
863 object refers to a symbol defined weakly in a dynamic object, the
864 real symbol in the dynamic object is also put in the dynamic
865 symbols; we also must arrange for both symbols to point to the
866 same memory location. We could handle the general case of symbol
867 aliasing, but a general symbol alias can only be generated in
868 assembler code, handling it correctly would be very time
869 consuming, and other ELF linkers don't handle general aliasing
871 while (weaks != NULL)
873 struct elf_link_hash_entry *hlook;
876 struct elf_link_hash_entry **hpp;
877 struct elf_link_hash_entry **hppend;
880 weaks = hlook->weakdef;
881 hlook->weakdef = NULL;
883 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
884 || hlook->root.type == bfd_link_hash_defweak
885 || hlook->root.type == bfd_link_hash_common
886 || hlook->root.type == bfd_link_hash_indirect);
887 slook = hlook->root.u.def.section;
888 vlook = hlook->root.u.def.value;
890 hpp = elf_sym_hashes (abfd);
891 hppend = hpp + extsymcount;
892 for (; hpp < hppend; hpp++)
894 struct elf_link_hash_entry *h;
897 if (h != NULL && h != hlook
898 && h->root.type == bfd_link_hash_defined
899 && h->root.u.def.section == slook
900 && h->root.u.def.value == vlook)
904 /* If the weak definition is in the list of dynamic
905 symbols, make sure the real definition is put there
907 if (hlook->dynindx != -1
910 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
914 /* If the real definition is in the list of dynamic
915 symbols, make sure the weak definition is put there
916 as well. If we don't do this, then the dynamic
917 loader might not merge the entries for the real
918 definition and the weak definition. */
920 && hlook->dynindx == -1)
922 if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
937 /* If this object is the same format as the output object, and it is
938 not a shared library, then let the backend look through the
941 This is required to build global offset table entries and to
942 arrange for dynamic relocs. It is not required for the
943 particular common case of linking non PIC code, even when linking
944 against shared libraries, but unfortunately there is no way of
945 knowing whether an object file has been compiled PIC or not.
946 Looking through the relocs is not particularly time consuming.
947 The problem is that we must either (1) keep the relocs in memory,
948 which causes the linker to require additional runtime memory or
949 (2) read the relocs twice from the input file, which wastes time.
950 This would be a good case for using mmap.
952 I have no idea how to handle linking PIC code into a file of a
953 different format. It probably can't be done. */
954 check_relocs = get_elf_backend_data (abfd)->check_relocs;
956 && abfd->xvec == info->hash->creator
957 && check_relocs != NULL)
961 for (o = abfd->sections; o != NULL; o = o->next)
963 Elf_Internal_Rela *internal_relocs;
966 if ((o->flags & SEC_RELOC) == 0
967 || o->reloc_count == 0)
970 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
971 (abfd, o, (PTR) NULL,
972 (Elf_Internal_Rela *) NULL,
974 if (internal_relocs == NULL)
977 ok = (*check_relocs) (abfd, info, o, internal_relocs);
979 if (! info->keep_memory)
980 free (internal_relocs);
987 /* If this is a non-traditional, non-relocateable link, try to
988 optimize the handling of the .stab/.stabstr sections. */
990 && ! info->relocateable
991 && ! info->traditional_format
992 && info->hash->creator->flavour == bfd_target_elf_flavour
993 && (info->strip != strip_all && info->strip != strip_debugger))
995 asection *stab, *stabstr;
997 stab = bfd_get_section_by_name (abfd, ".stab");
1000 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
1002 if (stabstr != NULL)
1004 struct bfd_elf_section_data *secdata;
1006 secdata = elf_section_data (stab);
1007 if (! _bfd_link_section_stabs (abfd,
1008 &elf_hash_table (info)->stab_info,
1010 &secdata->stab_info))
1026 /* Create some sections which will be filled in with dynamic linking
1027 information. ABFD is an input file which requires dynamic sections
1028 to be created. The dynamic sections take up virtual memory space
1029 when the final executable is run, so we need to create them before
1030 addresses are assigned to the output sections. We work out the
1031 actual contents and size of these sections later. */
1034 elf_link_create_dynamic_sections (abfd, info)
1036 struct bfd_link_info *info;
1039 register asection *s;
1040 struct elf_link_hash_entry *h;
1041 struct elf_backend_data *bed;
1043 if (elf_hash_table (info)->dynamic_sections_created)
1046 /* Make sure that all dynamic sections use the same input BFD. */
1047 if (elf_hash_table (info)->dynobj == NULL)
1048 elf_hash_table (info)->dynobj = abfd;
1050 abfd = elf_hash_table (info)->dynobj;
1052 /* Note that we set the SEC_IN_MEMORY flag for all of these
1054 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
1056 /* A dynamically linked executable has a .interp section, but a
1057 shared library does not. */
1060 s = bfd_make_section (abfd, ".interp");
1062 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
1066 s = bfd_make_section (abfd, ".dynsym");
1068 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
1069 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
1072 s = bfd_make_section (abfd, ".dynstr");
1074 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
1077 /* Create a strtab to hold the dynamic symbol names. */
1078 if (elf_hash_table (info)->dynstr == NULL)
1080 elf_hash_table (info)->dynstr = elf_stringtab_init ();
1081 if (elf_hash_table (info)->dynstr == NULL)
1085 s = bfd_make_section (abfd, ".dynamic");
1087 || ! bfd_set_section_flags (abfd, s, flags)
1088 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
1091 /* The special symbol _DYNAMIC is always set to the start of the
1092 .dynamic section. This call occurs before we have processed the
1093 symbols for any dynamic object, so we don't have to worry about
1094 overriding a dynamic definition. We could set _DYNAMIC in a
1095 linker script, but we only want to define it if we are, in fact,
1096 creating a .dynamic section. We don't want to define it if there
1097 is no .dynamic section, since on some ELF platforms the start up
1098 code examines it to decide how to initialize the process. */
1100 if (! (_bfd_generic_link_add_one_symbol
1101 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
1102 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
1103 (struct bfd_link_hash_entry **) &h)))
1105 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
1106 h->type = STT_OBJECT;
1109 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
1112 s = bfd_make_section (abfd, ".hash");
1114 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
1115 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
1118 /* Let the backend create the rest of the sections. This lets the
1119 backend set the right flags. The backend will normally create
1120 the .got and .plt sections. */
1121 bed = get_elf_backend_data (abfd);
1122 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
1125 elf_hash_table (info)->dynamic_sections_created = true;
1130 /* Add an entry to the .dynamic table. */
1133 elf_add_dynamic_entry (info, tag, val)
1134 struct bfd_link_info *info;
1138 Elf_Internal_Dyn dyn;
1142 bfd_byte *newcontents;
1144 dynobj = elf_hash_table (info)->dynobj;
1146 s = bfd_get_section_by_name (dynobj, ".dynamic");
1147 BFD_ASSERT (s != NULL);
1149 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
1150 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
1151 if (newcontents == NULL)
1155 dyn.d_un.d_val = val;
1156 elf_swap_dyn_out (dynobj, &dyn,
1157 (Elf_External_Dyn *) (newcontents + s->_raw_size));
1159 s->_raw_size = newsize;
1160 s->contents = newcontents;
1166 /* Read and swap the relocs for a section. They may have been cached.
1167 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1168 they are used as buffers to read into. They are known to be large
1169 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1170 value is allocated using either malloc or bfd_alloc, according to
1171 the KEEP_MEMORY argument. */
1174 NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
1178 PTR external_relocs;
1179 Elf_Internal_Rela *internal_relocs;
1180 boolean keep_memory;
1182 Elf_Internal_Shdr *rel_hdr;
1184 Elf_Internal_Rela *alloc2 = NULL;
1186 if (elf_section_data (o)->relocs != NULL)
1187 return elf_section_data (o)->relocs;
1189 if (o->reloc_count == 0)
1192 rel_hdr = &elf_section_data (o)->rel_hdr;
1194 if (internal_relocs == NULL)
1198 size = o->reloc_count * sizeof (Elf_Internal_Rela);
1200 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
1202 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
1203 if (internal_relocs == NULL)
1207 if (external_relocs == NULL)
1209 alloc1 = (PTR) bfd_malloc ((size_t) rel_hdr->sh_size);
1212 external_relocs = alloc1;
1215 if ((bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0)
1216 || (bfd_read (external_relocs, 1, rel_hdr->sh_size, abfd)
1217 != rel_hdr->sh_size))
1220 /* Swap in the relocs. For convenience, we always produce an
1221 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1223 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
1225 Elf_External_Rel *erel;
1226 Elf_External_Rel *erelend;
1227 Elf_Internal_Rela *irela;
1229 erel = (Elf_External_Rel *) external_relocs;
1230 erelend = erel + o->reloc_count;
1231 irela = internal_relocs;
1232 for (; erel < erelend; erel++, irela++)
1234 Elf_Internal_Rel irel;
1236 elf_swap_reloc_in (abfd, erel, &irel);
1237 irela->r_offset = irel.r_offset;
1238 irela->r_info = irel.r_info;
1239 irela->r_addend = 0;
1244 Elf_External_Rela *erela;
1245 Elf_External_Rela *erelaend;
1246 Elf_Internal_Rela *irela;
1248 BFD_ASSERT (rel_hdr->sh_entsize == sizeof (Elf_External_Rela));
1250 erela = (Elf_External_Rela *) external_relocs;
1251 erelaend = erela + o->reloc_count;
1252 irela = internal_relocs;
1253 for (; erela < erelaend; erela++, irela++)
1254 elf_swap_reloca_in (abfd, erela, irela);
1257 /* Cache the results for next time, if we can. */
1259 elf_section_data (o)->relocs = internal_relocs;
1264 /* Don't free alloc2, since if it was allocated we are passing it
1265 back (under the name of internal_relocs). */
1267 return internal_relocs;
1278 /* Record an assignment to a symbol made by a linker script. We need
1279 this in case some dynamic object refers to this symbol. */
1283 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
1285 struct bfd_link_info *info;
1289 struct elf_link_hash_entry *h;
1291 if (info->hash->creator->flavour != bfd_target_elf_flavour)
1294 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
1298 if (h->root.type == bfd_link_hash_new)
1299 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
1301 /* If this symbol is being provided by the linker script, and it is
1302 currently defined by a dynamic object, but not by a regular
1303 object, then mark it as undefined so that the generic linker will
1304 force the correct value. */
1306 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1307 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1308 h->root.type = bfd_link_hash_undefined;
1310 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
1311 h->type = STT_OBJECT;
1313 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
1314 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
1316 && h->dynindx == -1)
1318 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
1321 /* If this is a weak defined symbol, and we know a corresponding
1322 real symbol from the same dynamic object, make sure the real
1323 symbol is also made into a dynamic symbol. */
1324 if (h->weakdef != NULL
1325 && h->weakdef->dynindx == -1)
1327 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
1336 /* Array used to determine the number of hash table buckets to use
1337 based on the number of symbols there are. If there are fewer than
1338 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
1339 fewer than 37 we use 17 buckets, and so forth. We never use more
1340 than 521 buckets. */
1342 static const size_t elf_buckets[] =
1344 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 0
1347 /* Set up the sizes and contents of the ELF dynamic sections. This is
1348 called by the ELF linker emulation before_allocation routine. We
1349 must set the sizes of the sections before the linker sets the
1350 addresses of the various sections. */
1353 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
1354 export_dynamic, info, sinterpptr)
1358 boolean export_dynamic;
1359 struct bfd_link_info *info;
1360 asection **sinterpptr;
1363 struct elf_backend_data *bed;
1367 if (info->hash->creator->flavour != bfd_target_elf_flavour)
1370 dynobj = elf_hash_table (info)->dynobj;
1372 /* If there were no dynamic objects in the link, there is nothing to
1377 /* If we are supposed to export all symbols into the dynamic symbol
1378 table (this is not the normal case), then do so. */
1381 struct elf_info_failed eif;
1385 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
1391 if (elf_hash_table (info)->dynamic_sections_created)
1393 struct elf_info_failed eif;
1394 struct elf_link_hash_entry *h;
1395 bfd_size_type strsize;
1397 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
1398 BFD_ASSERT (*sinterpptr != NULL || info->shared);
1404 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, soname,
1406 if (indx == (bfd_size_type) -1
1407 || ! elf_add_dynamic_entry (info, DT_SONAME, indx))
1413 if (! elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
1421 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, rpath,
1423 if (indx == (bfd_size_type) -1
1424 || ! elf_add_dynamic_entry (info, DT_RPATH, indx))
1428 /* Find all symbols which were defined in a dynamic object and make
1429 the backend pick a reasonable value for them. */
1432 elf_link_hash_traverse (elf_hash_table (info),
1433 elf_adjust_dynamic_symbol,
1438 /* Add some entries to the .dynamic section. We fill in some of the
1439 values later, in elf_bfd_final_link, but we must add the entries
1440 now so that we know the final size of the .dynamic section. */
1441 h = elf_link_hash_lookup (elf_hash_table (info), "_init", false,
1444 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
1445 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
1447 if (! elf_add_dynamic_entry (info, DT_INIT, 0))
1450 h = elf_link_hash_lookup (elf_hash_table (info), "_fini", false,
1453 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
1454 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
1456 if (! elf_add_dynamic_entry (info, DT_FINI, 0))
1459 strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1460 if (! elf_add_dynamic_entry (info, DT_HASH, 0)
1461 || ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
1462 || ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
1463 || ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
1464 || ! elf_add_dynamic_entry (info, DT_SYMENT,
1465 sizeof (Elf_External_Sym)))
1469 /* The backend must work out the sizes of all the other dynamic
1471 bed = get_elf_backend_data (output_bfd);
1472 if (! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
1475 if (elf_hash_table (info)->dynamic_sections_created)
1480 size_t bucketcount = 0;
1481 Elf_Internal_Sym isym;
1483 /* Set the size of the .dynsym and .hash sections. We counted
1484 the number of dynamic symbols in elf_link_add_object_symbols.
1485 We will build the contents of .dynsym and .hash when we build
1486 the final symbol table, because until then we do not know the
1487 correct value to give the symbols. We built the .dynstr
1488 section as we went along in elf_link_add_object_symbols. */
1489 dynsymcount = elf_hash_table (info)->dynsymcount;
1490 s = bfd_get_section_by_name (dynobj, ".dynsym");
1491 BFD_ASSERT (s != NULL);
1492 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
1493 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
1494 if (s->contents == NULL && s->_raw_size != 0)
1497 /* The first entry in .dynsym is a dummy symbol. */
1504 elf_swap_symbol_out (output_bfd, &isym,
1505 (PTR) (Elf_External_Sym *) s->contents);
1507 for (i = 0; elf_buckets[i] != 0; i++)
1509 bucketcount = elf_buckets[i];
1510 if (dynsymcount < elf_buckets[i + 1])
1514 s = bfd_get_section_by_name (dynobj, ".hash");
1515 BFD_ASSERT (s != NULL);
1516 s->_raw_size = (2 + bucketcount + dynsymcount) * (ARCH_SIZE / 8);
1517 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
1518 if (s->contents == NULL)
1520 memset (s->contents, 0, (size_t) s->_raw_size);
1522 put_word (output_bfd, bucketcount, s->contents);
1523 put_word (output_bfd, dynsymcount, s->contents + (ARCH_SIZE / 8));
1525 elf_hash_table (info)->bucketcount = bucketcount;
1527 s = bfd_get_section_by_name (dynobj, ".dynstr");
1528 BFD_ASSERT (s != NULL);
1529 s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1531 if (! elf_add_dynamic_entry (info, DT_NULL, 0))
1539 /* This routine is used to export all defined symbols into the dynamic
1540 symbol table. It is called via elf_link_hash_traverse. */
1543 elf_export_symbol (h, data)
1544 struct elf_link_hash_entry *h;
1547 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1549 if (h->dynindx == -1
1550 && (h->elf_link_hash_flags
1551 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
1553 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
1564 /* Make the backend pick a good value for a dynamic symbol. This is
1565 called via elf_link_hash_traverse, and also calls itself
1569 elf_adjust_dynamic_symbol (h, data)
1570 struct elf_link_hash_entry *h;
1573 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1575 struct elf_backend_data *bed;
1577 /* If this symbol was mentioned in a non-ELF file, try to set
1578 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
1579 permit a non-ELF file to correctly refer to a symbol defined in
1580 an ELF dynamic object. */
1581 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
1583 if (h->root.type != bfd_link_hash_defined
1584 && h->root.type != bfd_link_hash_defweak)
1585 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
1588 if (h->root.u.def.section->owner != NULL
1589 && (bfd_get_flavour (h->root.u.def.section->owner)
1590 == bfd_target_elf_flavour))
1591 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
1593 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
1596 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1597 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
1599 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
1607 /* If this is a final link, and the symbol was defined as a common
1608 symbol in a regular object file, and there was no definition in
1609 any dynamic object, then the linker will have allocated space for
1610 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
1611 flag will not have been set. */
1612 if (h->root.type == bfd_link_hash_defined
1613 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
1614 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
1615 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
1616 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
1617 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
1619 /* If -Bsymbolic was used (which means to bind references to global
1620 symbols to the definition within the shared object), and this
1621 symbol was defined in a regular object, then it actually doesn't
1622 need a PLT entry. */
1623 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
1624 && eif->info->shared
1625 && eif->info->symbolic
1626 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
1627 h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT;
1629 /* If this symbol does not require a PLT entry, and it is not
1630 defined by a dynamic object, or is not referenced by a regular
1631 object, ignore it. We do have to handle a weak defined symbol,
1632 even if no regular object refers to it, if we decided to add it
1633 to the dynamic symbol table. FIXME: Do we normally need to worry
1634 about symbols which are defined by one dynamic object and
1635 referenced by another one? */
1636 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
1637 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1638 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
1639 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
1640 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
1643 /* If we've already adjusted this symbol, don't do it again. This
1644 can happen via a recursive call. */
1645 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
1648 /* Don't look at this symbol again. Note that we must set this
1649 after checking the above conditions, because we may look at a
1650 symbol once, decide not to do anything, and then get called
1651 recursively later after REF_REGULAR is set below. */
1652 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
1654 /* If this is a weak definition, and we know a real definition, and
1655 the real symbol is not itself defined by a regular object file,
1656 then get a good value for the real definition. We handle the
1657 real symbol first, for the convenience of the backend routine.
1659 Note that there is a confusing case here. If the real definition
1660 is defined by a regular object file, we don't get the real symbol
1661 from the dynamic object, but we do get the weak symbol. If the
1662 processor backend uses a COPY reloc, then if some routine in the
1663 dynamic object changes the real symbol, we will not see that
1664 change in the corresponding weak symbol. This is the way other
1665 ELF linkers work as well, and seems to be a result of the shared
1668 I will clarify this issue. Most SVR4 shared libraries define the
1669 variable _timezone and define timezone as a weak synonym. The
1670 tzset call changes _timezone. If you write
1671 extern int timezone;
1673 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
1674 you might expect that, since timezone is a synonym for _timezone,
1675 the same number will print both times. However, if the processor
1676 backend uses a COPY reloc, then actually timezone will be copied
1677 into your process image, and, since you define _timezone
1678 yourself, _timezone will not. Thus timezone and _timezone will
1679 wind up at different memory locations. The tzset call will set
1680 _timezone, leaving timezone unchanged. */
1682 if (h->weakdef != NULL)
1684 struct elf_link_hash_entry *weakdef;
1686 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1687 || h->root.type == bfd_link_hash_defweak);
1688 weakdef = h->weakdef;
1689 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
1690 || weakdef->root.type == bfd_link_hash_defweak);
1691 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
1692 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
1694 /* This symbol is defined by a regular object file, so we
1695 will not do anything special. Clear weakdef for the
1696 convenience of the processor backend. */
1701 /* There is an implicit reference by a regular object file
1702 via the weak symbol. */
1703 weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
1704 if (! elf_adjust_dynamic_symbol (weakdef, (PTR) eif))
1709 dynobj = elf_hash_table (eif->info)->dynobj;
1710 bed = get_elf_backend_data (dynobj);
1711 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
1720 /* Final phase of ELF linker. */
1722 /* A structure we use to avoid passing large numbers of arguments. */
1724 struct elf_final_link_info
1726 /* General link information. */
1727 struct bfd_link_info *info;
1730 /* Symbol string table. */
1731 struct bfd_strtab_hash *symstrtab;
1732 /* .dynsym section. */
1733 asection *dynsym_sec;
1734 /* .hash section. */
1736 /* Buffer large enough to hold contents of any section. */
1738 /* Buffer large enough to hold external relocs of any section. */
1739 PTR external_relocs;
1740 /* Buffer large enough to hold internal relocs of any section. */
1741 Elf_Internal_Rela *internal_relocs;
1742 /* Buffer large enough to hold external local symbols of any input
1744 Elf_External_Sym *external_syms;
1745 /* Buffer large enough to hold internal local symbols of any input
1747 Elf_Internal_Sym *internal_syms;
1748 /* Array large enough to hold a symbol index for each local symbol
1749 of any input BFD. */
1751 /* Array large enough to hold a section pointer for each local
1752 symbol of any input BFD. */
1753 asection **sections;
1754 /* Buffer to hold swapped out symbols. */
1755 Elf_External_Sym *symbuf;
1756 /* Number of swapped out symbols in buffer. */
1757 size_t symbuf_count;
1758 /* Number of symbols which fit in symbuf. */
1762 static boolean elf_link_output_sym
1763 PARAMS ((struct elf_final_link_info *, const char *,
1764 Elf_Internal_Sym *, asection *));
1765 static boolean elf_link_flush_output_syms
1766 PARAMS ((struct elf_final_link_info *));
1767 static boolean elf_link_output_extsym
1768 PARAMS ((struct elf_link_hash_entry *, PTR));
1769 static boolean elf_link_input_bfd
1770 PARAMS ((struct elf_final_link_info *, bfd *));
1771 static boolean elf_reloc_link_order
1772 PARAMS ((bfd *, struct bfd_link_info *, asection *,
1773 struct bfd_link_order *));
1775 /* This struct is used to pass information to routines called via
1776 elf_link_hash_traverse which must return failure. */
1778 struct elf_finfo_failed
1781 struct elf_final_link_info *finfo;
1784 /* Do the final step of an ELF link. */
1787 elf_bfd_final_link (abfd, info)
1789 struct bfd_link_info *info;
1793 struct elf_final_link_info finfo;
1794 register asection *o;
1795 register struct bfd_link_order *p;
1797 size_t max_contents_size;
1798 size_t max_external_reloc_size;
1799 size_t max_internal_reloc_count;
1800 size_t max_sym_count;
1802 Elf_Internal_Sym elfsym;
1804 Elf_Internal_Shdr *symtab_hdr;
1805 Elf_Internal_Shdr *symstrtab_hdr;
1806 struct elf_backend_data *bed = get_elf_backend_data (abfd);
1807 struct elf_finfo_failed eif;
1810 abfd->flags |= DYNAMIC;
1812 dynamic = elf_hash_table (info)->dynamic_sections_created;
1813 dynobj = elf_hash_table (info)->dynobj;
1816 finfo.output_bfd = abfd;
1817 finfo.symstrtab = elf_stringtab_init ();
1818 if (finfo.symstrtab == NULL)
1822 finfo.dynsym_sec = NULL;
1823 finfo.hash_sec = NULL;
1827 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
1828 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
1829 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
1831 finfo.contents = NULL;
1832 finfo.external_relocs = NULL;
1833 finfo.internal_relocs = NULL;
1834 finfo.external_syms = NULL;
1835 finfo.internal_syms = NULL;
1836 finfo.indices = NULL;
1837 finfo.sections = NULL;
1838 finfo.symbuf = NULL;
1839 finfo.symbuf_count = 0;
1841 /* Count up the number of relocations we will output for each output
1842 section, so that we know the sizes of the reloc sections. We
1843 also figure out some maximum sizes. */
1844 max_contents_size = 0;
1845 max_external_reloc_size = 0;
1846 max_internal_reloc_count = 0;
1848 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
1852 for (p = o->link_order_head; p != NULL; p = p->next)
1854 if (p->type == bfd_section_reloc_link_order
1855 || p->type == bfd_symbol_reloc_link_order)
1857 else if (p->type == bfd_indirect_link_order)
1861 sec = p->u.indirect.section;
1863 /* Mark all sections which are to be included in the
1864 link. This will normally be every section. We need
1865 to do this so that we can identify any sections which
1866 the linker has decided to not include. */
1867 sec->linker_mark = true;
1869 if (info->relocateable)
1870 o->reloc_count += sec->reloc_count;
1872 if (sec->_raw_size > max_contents_size)
1873 max_contents_size = sec->_raw_size;
1874 if (sec->_cooked_size > max_contents_size)
1875 max_contents_size = sec->_cooked_size;
1877 /* We are interested in just local symbols, not all
1879 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour)
1883 if (elf_bad_symtab (sec->owner))
1884 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
1885 / sizeof (Elf_External_Sym));
1887 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
1889 if (sym_count > max_sym_count)
1890 max_sym_count = sym_count;
1892 if ((sec->flags & SEC_RELOC) != 0)
1896 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
1897 if (ext_size > max_external_reloc_size)
1898 max_external_reloc_size = ext_size;
1899 if (sec->reloc_count > max_internal_reloc_count)
1900 max_internal_reloc_count = sec->reloc_count;
1906 if (o->reloc_count > 0)
1907 o->flags |= SEC_RELOC;
1910 /* Explicitly clear the SEC_RELOC flag. The linker tends to
1911 set it (this is probably a bug) and if it is set
1912 assign_section_numbers will create a reloc section. */
1913 o->flags &=~ SEC_RELOC;
1916 /* If the SEC_ALLOC flag is not set, force the section VMA to
1917 zero. This is done in elf_fake_sections as well, but forcing
1918 the VMA to 0 here will ensure that relocs against these
1919 sections are handled correctly. */
1920 if ((o->flags & SEC_ALLOC) == 0
1921 && ! o->user_set_vma)
1925 /* Figure out the file positions for everything but the symbol table
1926 and the relocs. We set symcount to force assign_section_numbers
1927 to create a symbol table. */
1928 abfd->symcount = info->strip == strip_all ? 0 : 1;
1929 BFD_ASSERT (! abfd->output_has_begun);
1930 if (! _bfd_elf_compute_section_file_positions (abfd, info))
1933 /* That created the reloc sections. Set their sizes, and assign
1934 them file positions, and allocate some buffers. */
1935 for (o = abfd->sections; o != NULL; o = o->next)
1937 if ((o->flags & SEC_RELOC) != 0)
1939 Elf_Internal_Shdr *rel_hdr;
1940 register struct elf_link_hash_entry **p, **pend;
1942 rel_hdr = &elf_section_data (o)->rel_hdr;
1944 rel_hdr->sh_size = rel_hdr->sh_entsize * o->reloc_count;
1946 /* The contents field must last into write_object_contents,
1947 so we allocate it with bfd_alloc rather than malloc. */
1948 rel_hdr->contents = (PTR) bfd_alloc (abfd, rel_hdr->sh_size);
1949 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
1952 p = ((struct elf_link_hash_entry **)
1953 bfd_malloc (o->reloc_count
1954 * sizeof (struct elf_link_hash_entry *)));
1955 if (p == NULL && o->reloc_count != 0)
1957 elf_section_data (o)->rel_hashes = p;
1958 pend = p + o->reloc_count;
1959 for (; p < pend; p++)
1962 /* Use the reloc_count field as an index when outputting the
1968 _bfd_elf_assign_file_positions_for_relocs (abfd);
1970 /* We have now assigned file positions for all the sections except
1971 .symtab and .strtab. We start the .symtab section at the current
1972 file position, and write directly to it. We build the .strtab
1973 section in memory. */
1975 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1976 /* sh_name is set in prep_headers. */
1977 symtab_hdr->sh_type = SHT_SYMTAB;
1978 symtab_hdr->sh_flags = 0;
1979 symtab_hdr->sh_addr = 0;
1980 symtab_hdr->sh_size = 0;
1981 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
1982 /* sh_link is set in assign_section_numbers. */
1983 /* sh_info is set below. */
1984 /* sh_offset is set just below. */
1985 symtab_hdr->sh_addralign = 4; /* FIXME: system dependent? */
1987 off = elf_tdata (abfd)->next_file_pos;
1988 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
1990 /* Note that at this point elf_tdata (abfd)->next_file_pos is
1991 incorrect. We do not yet know the size of the .symtab section.
1992 We correct next_file_pos below, after we do know the size. */
1994 /* Allocate a buffer to hold swapped out symbols. This is to avoid
1995 continuously seeking to the right position in the file. */
1996 if (! info->keep_memory || max_sym_count < 20)
1997 finfo.symbuf_size = 20;
1999 finfo.symbuf_size = max_sym_count;
2000 finfo.symbuf = ((Elf_External_Sym *)
2001 bfd_malloc (finfo.symbuf_size * sizeof (Elf_External_Sym)));
2002 if (finfo.symbuf == NULL)
2005 /* Start writing out the symbol table. The first symbol is always a
2007 if (info->strip != strip_all || info->relocateable)
2009 elfsym.st_value = 0;
2012 elfsym.st_other = 0;
2013 elfsym.st_shndx = SHN_UNDEF;
2014 if (! elf_link_output_sym (&finfo, (const char *) NULL,
2015 &elfsym, bfd_und_section_ptr))
2020 /* Some standard ELF linkers do this, but we don't because it causes
2021 bootstrap comparison failures. */
2022 /* Output a file symbol for the output file as the second symbol.
2023 We output this even if we are discarding local symbols, although
2024 I'm not sure if this is correct. */
2025 elfsym.st_value = 0;
2027 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
2028 elfsym.st_other = 0;
2029 elfsym.st_shndx = SHN_ABS;
2030 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
2031 &elfsym, bfd_abs_section_ptr))
2035 /* Output a symbol for each section. We output these even if we are
2036 discarding local symbols, since they are used for relocs. These
2037 symbols have no names. We store the index of each one in the
2038 index field of the section, so that we can find it again when
2039 outputting relocs. */
2040 if (info->strip != strip_all || info->relocateable)
2042 elfsym.st_value = 0;
2044 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
2045 elfsym.st_other = 0;
2046 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
2048 o = section_from_elf_index (abfd, i);
2050 o->target_index = abfd->symcount;
2051 elfsym.st_shndx = i;
2052 if (! elf_link_output_sym (&finfo, (const char *) NULL,
2058 /* Allocate some memory to hold information read in from the input
2060 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
2061 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
2062 finfo.internal_relocs = ((Elf_Internal_Rela *)
2063 bfd_malloc (max_internal_reloc_count
2064 * sizeof (Elf_Internal_Rela)));
2065 finfo.external_syms = ((Elf_External_Sym *)
2066 bfd_malloc (max_sym_count
2067 * sizeof (Elf_External_Sym)));
2068 finfo.internal_syms = ((Elf_Internal_Sym *)
2069 bfd_malloc (max_sym_count
2070 * sizeof (Elf_Internal_Sym)));
2071 finfo.indices = (long *) bfd_malloc (max_sym_count * sizeof (long));
2072 finfo.sections = ((asection **)
2073 bfd_malloc (max_sym_count * sizeof (asection *)));
2074 if ((finfo.contents == NULL && max_contents_size != 0)
2075 || (finfo.external_relocs == NULL && max_external_reloc_size != 0)
2076 || (finfo.internal_relocs == NULL && max_internal_reloc_count != 0)
2077 || (finfo.external_syms == NULL && max_sym_count != 0)
2078 || (finfo.internal_syms == NULL && max_sym_count != 0)
2079 || (finfo.indices == NULL && max_sym_count != 0)
2080 || (finfo.sections == NULL && max_sym_count != 0))
2083 /* Since ELF permits relocations to be against local symbols, we
2084 must have the local symbols available when we do the relocations.
2085 Since we would rather only read the local symbols once, and we
2086 would rather not keep them in memory, we handle all the
2087 relocations for a single input file at the same time.
2089 Unfortunately, there is no way to know the total number of local
2090 symbols until we have seen all of them, and the local symbol
2091 indices precede the global symbol indices. This means that when
2092 we are generating relocateable output, and we see a reloc against
2093 a global symbol, we can not know the symbol index until we have
2094 finished examining all the local symbols to see which ones we are
2095 going to output. To deal with this, we keep the relocations in
2096 memory, and don't output them until the end of the link. This is
2097 an unfortunate waste of memory, but I don't see a good way around
2098 it. Fortunately, it only happens when performing a relocateable
2099 link, which is not the common case. FIXME: If keep_memory is set
2100 we could write the relocs out and then read them again; I don't
2101 know how bad the memory loss will be. */
2103 for (sub = info->input_bfds; sub != NULL; sub = sub->next)
2104 sub->output_has_begun = false;
2105 for (o = abfd->sections; o != NULL; o = o->next)
2107 for (p = o->link_order_head; p != NULL; p = p->next)
2109 if (p->type == bfd_indirect_link_order
2110 && (bfd_get_flavour (p->u.indirect.section->owner)
2111 == bfd_target_elf_flavour))
2113 sub = p->u.indirect.section->owner;
2114 if (! sub->output_has_begun)
2116 if (! elf_link_input_bfd (&finfo, sub))
2118 sub->output_has_begun = true;
2121 else if (p->type == bfd_section_reloc_link_order
2122 || p->type == bfd_symbol_reloc_link_order)
2124 if (! elf_reloc_link_order (abfd, info, o, p))
2129 if (! _bfd_default_link_order (abfd, info, o, p))
2135 /* That wrote out all the local symbols. Finish up the symbol table
2136 with the global symbols. */
2138 /* The sh_info field records the index of the first non local
2140 symtab_hdr->sh_info = abfd->symcount;
2142 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info = 1;
2144 /* We get the global symbols from the hash table. */
2147 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
2152 /* Flush all symbols to the file. */
2153 if (! elf_link_flush_output_syms (&finfo))
2156 /* Now we know the size of the symtab section. */
2157 off += symtab_hdr->sh_size;
2159 /* Finish up and write out the symbol string table (.strtab)
2161 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
2162 /* sh_name was set in prep_headers. */
2163 symstrtab_hdr->sh_type = SHT_STRTAB;
2164 symstrtab_hdr->sh_flags = 0;
2165 symstrtab_hdr->sh_addr = 0;
2166 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
2167 symstrtab_hdr->sh_entsize = 0;
2168 symstrtab_hdr->sh_link = 0;
2169 symstrtab_hdr->sh_info = 0;
2170 /* sh_offset is set just below. */
2171 symstrtab_hdr->sh_addralign = 1;
2173 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
2174 elf_tdata (abfd)->next_file_pos = off;
2176 if (abfd->symcount > 0)
2178 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
2179 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
2183 /* Adjust the relocs to have the correct symbol indices. */
2184 for (o = abfd->sections; o != NULL; o = o->next)
2186 struct elf_link_hash_entry **rel_hash;
2187 Elf_Internal_Shdr *rel_hdr;
2189 if ((o->flags & SEC_RELOC) == 0)
2192 rel_hash = elf_section_data (o)->rel_hashes;
2193 rel_hdr = &elf_section_data (o)->rel_hdr;
2194 for (i = 0; i < o->reloc_count; i++, rel_hash++)
2196 if (*rel_hash == NULL)
2199 BFD_ASSERT ((*rel_hash)->indx >= 0);
2201 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
2203 Elf_External_Rel *erel;
2204 Elf_Internal_Rel irel;
2206 erel = (Elf_External_Rel *) rel_hdr->contents + i;
2207 elf_swap_reloc_in (abfd, erel, &irel);
2208 irel.r_info = ELF_R_INFO ((*rel_hash)->indx,
2209 ELF_R_TYPE (irel.r_info));
2210 elf_swap_reloc_out (abfd, &irel, erel);
2214 Elf_External_Rela *erela;
2215 Elf_Internal_Rela irela;
2217 BFD_ASSERT (rel_hdr->sh_entsize
2218 == sizeof (Elf_External_Rela));
2220 erela = (Elf_External_Rela *) rel_hdr->contents + i;
2221 elf_swap_reloca_in (abfd, erela, &irela);
2222 irela.r_info = ELF_R_INFO ((*rel_hash)->indx,
2223 ELF_R_TYPE (irela.r_info));
2224 elf_swap_reloca_out (abfd, &irela, erela);
2228 /* Set the reloc_count field to 0 to prevent write_relocs from
2229 trying to swap the relocs out itself. */
2233 /* If we are linking against a dynamic object, or generating a
2234 shared library, finish up the dynamic linking information. */
2237 Elf_External_Dyn *dyncon, *dynconend;
2239 /* Fix up .dynamic entries. */
2240 o = bfd_get_section_by_name (dynobj, ".dynamic");
2241 BFD_ASSERT (o != NULL);
2243 dyncon = (Elf_External_Dyn *) o->contents;
2244 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
2245 for (; dyncon < dynconend; dyncon++)
2247 Elf_Internal_Dyn dyn;
2251 elf_swap_dyn_in (dynobj, dyncon, &dyn);
2258 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
2259 magic _init and _fini symbols. This is pretty ugly,
2260 but we are compatible. */
2268 struct elf_link_hash_entry *h;
2270 h = elf_link_hash_lookup (elf_hash_table (info), name,
2271 false, false, true);
2273 && (h->root.type == bfd_link_hash_defined
2274 || h->root.type == bfd_link_hash_defweak))
2276 dyn.d_un.d_val = h->root.u.def.value;
2277 o = h->root.u.def.section;
2278 if (o->output_section != NULL)
2279 dyn.d_un.d_val += (o->output_section->vma
2280 + o->output_offset);
2283 /* The symbol is imported from another shared
2284 library and does not apply to this one. */
2288 elf_swap_dyn_out (dynobj, &dyn, dyncon);
2302 o = bfd_get_section_by_name (abfd, name);
2303 BFD_ASSERT (o != NULL);
2304 dyn.d_un.d_ptr = o->vma;
2305 elf_swap_dyn_out (dynobj, &dyn, dyncon);
2312 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
2317 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
2319 Elf_Internal_Shdr *hdr;
2321 hdr = elf_elfsections (abfd)[i];
2322 if (hdr->sh_type == type
2323 && (hdr->sh_flags & SHF_ALLOC) != 0)
2325 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
2326 dyn.d_un.d_val += hdr->sh_size;
2329 if (dyn.d_un.d_val == 0
2330 || hdr->sh_addr < dyn.d_un.d_val)
2331 dyn.d_un.d_val = hdr->sh_addr;
2335 elf_swap_dyn_out (dynobj, &dyn, dyncon);
2341 /* If we have created any dynamic sections, then output them. */
2344 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
2347 for (o = dynobj->sections; o != NULL; o = o->next)
2349 if ((o->flags & SEC_HAS_CONTENTS) == 0
2350 || o->_raw_size == 0)
2352 if ((o->flags & SEC_IN_MEMORY) == 0)
2354 /* At this point, we are only interested in sections
2355 created by elf_link_create_dynamic_sections. FIXME:
2356 This test is fragile. */
2359 if ((elf_section_data (o->output_section)->this_hdr.sh_type
2361 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
2363 if (! bfd_set_section_contents (abfd, o->output_section,
2364 o->contents, o->output_offset,
2372 /* The contents of the .dynstr section are actually in a
2374 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
2375 if (bfd_seek (abfd, off, SEEK_SET) != 0
2376 || ! _bfd_stringtab_emit (abfd,
2377 elf_hash_table (info)->dynstr))
2383 /* If we have optimized stabs strings, output them. */
2384 if (elf_hash_table (info)->stab_info != NULL)
2386 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
2390 if (finfo.symstrtab != NULL)
2391 _bfd_stringtab_free (finfo.symstrtab);
2392 if (finfo.contents != NULL)
2393 free (finfo.contents);
2394 if (finfo.external_relocs != NULL)
2395 free (finfo.external_relocs);
2396 if (finfo.internal_relocs != NULL)
2397 free (finfo.internal_relocs);
2398 if (finfo.external_syms != NULL)
2399 free (finfo.external_syms);
2400 if (finfo.internal_syms != NULL)
2401 free (finfo.internal_syms);
2402 if (finfo.indices != NULL)
2403 free (finfo.indices);
2404 if (finfo.sections != NULL)
2405 free (finfo.sections);
2406 if (finfo.symbuf != NULL)
2407 free (finfo.symbuf);
2408 for (o = abfd->sections; o != NULL; o = o->next)
2410 if ((o->flags & SEC_RELOC) != 0
2411 && elf_section_data (o)->rel_hashes != NULL)
2412 free (elf_section_data (o)->rel_hashes);
2415 elf_tdata (abfd)->linker = true;
2420 if (finfo.symstrtab != NULL)
2421 _bfd_stringtab_free (finfo.symstrtab);
2422 if (finfo.contents != NULL)
2423 free (finfo.contents);
2424 if (finfo.external_relocs != NULL)
2425 free (finfo.external_relocs);
2426 if (finfo.internal_relocs != NULL)
2427 free (finfo.internal_relocs);
2428 if (finfo.external_syms != NULL)
2429 free (finfo.external_syms);
2430 if (finfo.internal_syms != NULL)
2431 free (finfo.internal_syms);
2432 if (finfo.indices != NULL)
2433 free (finfo.indices);
2434 if (finfo.sections != NULL)
2435 free (finfo.sections);
2436 if (finfo.symbuf != NULL)
2437 free (finfo.symbuf);
2438 for (o = abfd->sections; o != NULL; o = o->next)
2440 if ((o->flags & SEC_RELOC) != 0
2441 && elf_section_data (o)->rel_hashes != NULL)
2442 free (elf_section_data (o)->rel_hashes);
2448 /* Add a symbol to the output symbol table. */
2451 elf_link_output_sym (finfo, name, elfsym, input_sec)
2452 struct elf_final_link_info *finfo;
2454 Elf_Internal_Sym *elfsym;
2455 asection *input_sec;
2457 boolean (*output_symbol_hook) PARAMS ((bfd *,
2458 struct bfd_link_info *info,
2463 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
2464 elf_backend_link_output_symbol_hook;
2465 if (output_symbol_hook != NULL)
2467 if (! ((*output_symbol_hook)
2468 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
2472 if (name == (const char *) NULL || *name == '\0')
2473 elfsym->st_name = 0;
2476 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
2479 if (elfsym->st_name == (unsigned long) -1)
2483 if (finfo->symbuf_count >= finfo->symbuf_size)
2485 if (! elf_link_flush_output_syms (finfo))
2489 elf_swap_symbol_out (finfo->output_bfd, elfsym,
2490 (PTR) (finfo->symbuf + finfo->symbuf_count));
2491 ++finfo->symbuf_count;
2493 ++finfo->output_bfd->symcount;
2498 /* Flush the output symbols to the file. */
2501 elf_link_flush_output_syms (finfo)
2502 struct elf_final_link_info *finfo;
2504 if (finfo->symbuf_count > 0)
2506 Elf_Internal_Shdr *symtab;
2508 symtab = &elf_tdata (finfo->output_bfd)->symtab_hdr;
2510 if (bfd_seek (finfo->output_bfd, symtab->sh_offset + symtab->sh_size,
2512 || (bfd_write ((PTR) finfo->symbuf, finfo->symbuf_count,
2513 sizeof (Elf_External_Sym), finfo->output_bfd)
2514 != finfo->symbuf_count * sizeof (Elf_External_Sym)))
2517 symtab->sh_size += finfo->symbuf_count * sizeof (Elf_External_Sym);
2519 finfo->symbuf_count = 0;
2525 /* Add an external symbol to the symbol table. This is called from
2526 the hash table traversal routine. */
2529 elf_link_output_extsym (h, data)
2530 struct elf_link_hash_entry *h;
2533 struct elf_finfo_failed *eif = (struct elf_finfo_failed *) data;
2534 struct elf_final_link_info *finfo = eif->finfo;
2536 Elf_Internal_Sym sym;
2537 asection *input_sec;
2539 /* If we are not creating a shared library, and this symbol is
2540 referenced by a shared library but is not defined anywhere, then
2541 warn that it is undefined. If we do not do this, the runtime
2542 linker will complain that the symbol is undefined when the
2543 program is run. We don't have to worry about symbols that are
2544 referenced by regular files, because we will already have issued
2545 warnings for them. */
2546 if (! finfo->info->relocateable
2547 && ! finfo->info->shared
2548 && h->root.type == bfd_link_hash_undefined
2549 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
2550 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
2552 if (! ((*finfo->info->callbacks->undefined_symbol)
2553 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
2554 (asection *) NULL, 0)))
2561 /* We don't want to output symbols that have never been mentioned by
2562 a regular file, or that we have been told to strip. However, if
2563 h->indx is set to -2, the symbol is used by a reloc and we must
2567 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2568 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
2569 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
2570 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
2572 else if (finfo->info->strip == strip_all
2573 || (finfo->info->strip == strip_some
2574 && bfd_hash_lookup (finfo->info->keep_hash,
2575 h->root.root.string,
2576 false, false) == NULL))
2581 /* If we're stripping it, and it's not a dynamic symbol, there's
2582 nothing else to do. */
2583 if (strip && h->dynindx == -1)
2587 sym.st_size = h->size;
2588 sym.st_other = h->other;
2589 if (h->root.type == bfd_link_hash_undefweak
2590 || h->root.type == bfd_link_hash_defweak)
2591 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
2593 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
2595 switch (h->root.type)
2598 case bfd_link_hash_new:
2602 case bfd_link_hash_undefined:
2603 input_sec = bfd_und_section_ptr;
2604 sym.st_shndx = SHN_UNDEF;
2607 case bfd_link_hash_undefweak:
2608 input_sec = bfd_und_section_ptr;
2609 sym.st_shndx = SHN_UNDEF;
2612 case bfd_link_hash_defined:
2613 case bfd_link_hash_defweak:
2615 input_sec = h->root.u.def.section;
2616 if (input_sec->output_section != NULL)
2619 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
2620 input_sec->output_section);
2621 if (sym.st_shndx == (unsigned short) -1)
2627 /* ELF symbols in relocateable files are section relative,
2628 but in nonrelocateable files they are virtual
2630 sym.st_value = h->root.u.def.value + input_sec->output_offset;
2631 if (! finfo->info->relocateable)
2632 sym.st_value += input_sec->output_section->vma;
2636 BFD_ASSERT ((bfd_get_flavour (input_sec->owner)
2637 == bfd_target_elf_flavour)
2638 && elf_elfheader (input_sec->owner)->e_type == ET_DYN);
2639 sym.st_shndx = SHN_UNDEF;
2640 input_sec = bfd_und_section_ptr;
2645 case bfd_link_hash_common:
2646 input_sec = bfd_com_section_ptr;
2647 sym.st_shndx = SHN_COMMON;
2648 sym.st_value = 1 << h->root.u.c.p->alignment_power;
2651 case bfd_link_hash_indirect:
2652 case bfd_link_hash_warning:
2653 /* We can't represent these symbols in ELF. A warning symbol
2654 may have come from a .gnu.warning.SYMBOL section anyhow. We
2655 just put the target symbol in the hash table. If the target
2656 symbol does not really exist, don't do anything. */
2657 if (h->root.u.i.link->type == bfd_link_hash_new)
2659 return (elf_link_output_extsym
2660 ((struct elf_link_hash_entry *) h->root.u.i.link, data));
2663 /* If this symbol should be put in the .dynsym section, then put it
2664 there now. We have already know the symbol index. We also fill
2665 in the entry in the .hash section. */
2666 if (h->dynindx != -1
2667 && elf_hash_table (finfo->info)->dynamic_sections_created)
2669 struct elf_backend_data *bed;
2672 bfd_byte *bucketpos;
2675 sym.st_name = h->dynstr_index;
2677 /* Give the processor backend a chance to tweak the symbol
2678 value, and also to finish up anything that needs to be done
2680 bed = get_elf_backend_data (finfo->output_bfd);
2681 if (! ((*bed->elf_backend_finish_dynamic_symbol)
2682 (finfo->output_bfd, finfo->info, h, &sym)))
2688 elf_swap_symbol_out (finfo->output_bfd, &sym,
2689 (PTR) (((Elf_External_Sym *)
2690 finfo->dynsym_sec->contents)
2693 bucketcount = elf_hash_table (finfo->info)->bucketcount;
2694 bucket = (bfd_elf_hash ((const unsigned char *) h->root.root.string)
2696 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
2697 + (bucket + 2) * (ARCH_SIZE / 8));
2698 chain = get_word (finfo->output_bfd, bucketpos);
2699 put_word (finfo->output_bfd, h->dynindx, bucketpos);
2700 put_word (finfo->output_bfd, chain,
2701 ((bfd_byte *) finfo->hash_sec->contents
2702 + (bucketcount + 2 + h->dynindx) * (ARCH_SIZE / 8)));
2705 /* If we're stripping it, then it was just a dynamic symbol, and
2706 there's nothing else to do. */
2710 h->indx = finfo->output_bfd->symcount;
2712 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
2721 /* Link an input file into the linker output file. This function
2722 handles all the sections and relocations of the input file at once.
2723 This is so that we only have to read the local symbols once, and
2724 don't have to keep them in memory. */
2727 elf_link_input_bfd (finfo, input_bfd)
2728 struct elf_final_link_info *finfo;
2731 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
2732 bfd *, asection *, bfd_byte *,
2733 Elf_Internal_Rela *,
2734 Elf_Internal_Sym *, asection **));
2736 Elf_Internal_Shdr *symtab_hdr;
2739 Elf_External_Sym *external_syms;
2740 Elf_External_Sym *esym;
2741 Elf_External_Sym *esymend;
2742 Elf_Internal_Sym *isym;
2744 asection **ppsection;
2747 output_bfd = finfo->output_bfd;
2749 get_elf_backend_data (output_bfd)->elf_backend_relocate_section;
2751 /* If this is a dynamic object, we don't want to do anything here:
2752 we don't want the local symbols, and we don't want the section
2754 if (elf_elfheader (input_bfd)->e_type == ET_DYN)
2757 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2758 if (elf_bad_symtab (input_bfd))
2760 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
2765 locsymcount = symtab_hdr->sh_info;
2766 extsymoff = symtab_hdr->sh_info;
2769 /* Read the local symbols. */
2770 if (symtab_hdr->contents != NULL)
2771 external_syms = (Elf_External_Sym *) symtab_hdr->contents;
2772 else if (locsymcount == 0)
2773 external_syms = NULL;
2776 external_syms = finfo->external_syms;
2777 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
2778 || (bfd_read (external_syms, sizeof (Elf_External_Sym),
2779 locsymcount, input_bfd)
2780 != locsymcount * sizeof (Elf_External_Sym)))
2784 /* Swap in the local symbols and write out the ones which we know
2785 are going into the output file. */
2786 esym = external_syms;
2787 esymend = esym + locsymcount;
2788 isym = finfo->internal_syms;
2789 pindex = finfo->indices;
2790 ppsection = finfo->sections;
2791 for (; esym < esymend; esym++, isym++, pindex++, ppsection++)
2795 Elf_Internal_Sym osym;
2797 elf_swap_symbol_in (input_bfd, esym, isym);
2800 if (elf_bad_symtab (input_bfd))
2802 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
2809 if (isym->st_shndx == SHN_UNDEF)
2810 isec = bfd_und_section_ptr;
2811 else if (isym->st_shndx > 0 && isym->st_shndx < SHN_LORESERVE)
2812 isec = section_from_elf_index (input_bfd, isym->st_shndx);
2813 else if (isym->st_shndx == SHN_ABS)
2814 isec = bfd_abs_section_ptr;
2815 else if (isym->st_shndx == SHN_COMMON)
2816 isec = bfd_com_section_ptr;
2825 /* Don't output the first, undefined, symbol. */
2826 if (esym == external_syms)
2829 /* If we are stripping all symbols, we don't want to output this
2831 if (finfo->info->strip == strip_all)
2834 /* We never output section symbols. Instead, we use the section
2835 symbol of the corresponding section in the output file. */
2836 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
2839 /* If we are discarding all local symbols, we don't want to
2840 output this one. If we are generating a relocateable output
2841 file, then some of the local symbols may be required by
2842 relocs; we output them below as we discover that they are
2844 if (finfo->info->discard == discard_all)
2847 /* Get the name of the symbol. */
2848 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
2853 /* See if we are discarding symbols with this name. */
2854 if ((finfo->info->strip == strip_some
2855 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
2857 || (finfo->info->discard == discard_l
2858 && strncmp (name, finfo->info->lprefix,
2859 finfo->info->lprefix_len) == 0))
2862 /* If we get here, we are going to output this symbol. */
2866 /* Adjust the section index for the output file. */
2867 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
2868 isec->output_section);
2869 if (osym.st_shndx == (unsigned short) -1)
2872 *pindex = output_bfd->symcount;
2874 /* ELF symbols in relocateable files are section relative, but
2875 in executable files they are virtual addresses. Note that
2876 this code assumes that all ELF sections have an associated
2877 BFD section with a reasonable value for output_offset; below
2878 we assume that they also have a reasonable value for
2879 output_section. Any special sections must be set up to meet
2880 these requirements. */
2881 osym.st_value += isec->output_offset;
2882 if (! finfo->info->relocateable)
2883 osym.st_value += isec->output_section->vma;
2885 if (! elf_link_output_sym (finfo, name, &osym, isec))
2889 /* Relocate the contents of each section. */
2890 for (o = input_bfd->sections; o != NULL; o = o->next)
2894 if (! o->linker_mark)
2896 /* This section was omitted from the link. */
2900 if ((o->flags & SEC_HAS_CONTENTS) == 0
2901 || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
2904 if ((o->flags & SEC_IN_MEMORY) != 0
2905 && input_bfd == elf_hash_table (finfo->info)->dynobj)
2907 /* Section was created by elf_link_create_dynamic_sections.
2908 FIXME: This test is fragile. */
2912 /* Get the contents of the section. They have been cached by a
2913 relaxation routine. Note that o is a section in an input
2914 file, so the contents field will not have been set by any of
2915 the routines which work on output files. */
2916 if (elf_section_data (o)->this_hdr.contents != NULL)
2917 contents = elf_section_data (o)->this_hdr.contents;
2920 contents = finfo->contents;
2921 if (! bfd_get_section_contents (input_bfd, o, contents,
2922 (file_ptr) 0, o->_raw_size))
2926 if ((o->flags & SEC_RELOC) != 0)
2928 Elf_Internal_Rela *internal_relocs;
2930 /* Get the swapped relocs. */
2931 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2932 (input_bfd, o, finfo->external_relocs,
2933 finfo->internal_relocs, false));
2934 if (internal_relocs == NULL
2935 && o->reloc_count > 0)
2938 /* Relocate the section by invoking a back end routine.
2940 The back end routine is responsible for adjusting the
2941 section contents as necessary, and (if using Rela relocs
2942 and generating a relocateable output file) adjusting the
2943 reloc addend as necessary.
2945 The back end routine does not have to worry about setting
2946 the reloc address or the reloc symbol index.
2948 The back end routine is given a pointer to the swapped in
2949 internal symbols, and can access the hash table entries
2950 for the external symbols via elf_sym_hashes (input_bfd).
2952 When generating relocateable output, the back end routine
2953 must handle STB_LOCAL/STT_SECTION symbols specially. The
2954 output symbol is going to be a section symbol
2955 corresponding to the output section, which will require
2956 the addend to be adjusted. */
2958 if (! (*relocate_section) (output_bfd, finfo->info,
2959 input_bfd, o, contents,
2961 finfo->internal_syms,
2965 if (finfo->info->relocateable)
2967 Elf_Internal_Rela *irela;
2968 Elf_Internal_Rela *irelaend;
2969 struct elf_link_hash_entry **rel_hash;
2970 Elf_Internal_Shdr *input_rel_hdr;
2971 Elf_Internal_Shdr *output_rel_hdr;
2973 /* Adjust the reloc addresses and symbol indices. */
2975 irela = internal_relocs;
2976 irelaend = irela + o->reloc_count;
2977 rel_hash = (elf_section_data (o->output_section)->rel_hashes
2978 + o->output_section->reloc_count);
2979 for (; irela < irelaend; irela++, rel_hash++)
2981 unsigned long r_symndx;
2982 Elf_Internal_Sym *isym;
2985 irela->r_offset += o->output_offset;
2987 r_symndx = ELF_R_SYM (irela->r_info);
2992 if (r_symndx >= locsymcount
2993 || (elf_bad_symtab (input_bfd)
2994 && finfo->sections[r_symndx] == NULL))
2998 /* This is a reloc against a global symbol. We
2999 have not yet output all the local symbols, so
3000 we do not know the symbol index of any global
3001 symbol. We set the rel_hash entry for this
3002 reloc to point to the global hash table entry
3003 for this symbol. The symbol index is then
3004 set at the end of elf_bfd_final_link. */
3005 indx = r_symndx - extsymoff;
3006 *rel_hash = elf_sym_hashes (input_bfd)[indx];
3008 /* Setting the index to -2 tells
3009 elf_link_output_extsym that this symbol is
3011 BFD_ASSERT ((*rel_hash)->indx < 0);
3012 (*rel_hash)->indx = -2;
3017 /* This is a reloc against a local symbol. */
3020 isym = finfo->internal_syms + r_symndx;
3021 sec = finfo->sections[r_symndx];
3022 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
3024 /* I suppose the backend ought to fill in the
3025 section of any STT_SECTION symbol against a
3026 processor specific section. */
3027 if (sec != NULL && bfd_is_abs_section (sec))
3029 else if (sec == NULL || sec->owner == NULL)
3031 bfd_set_error (bfd_error_bad_value);
3036 r_symndx = sec->output_section->target_index;
3037 BFD_ASSERT (r_symndx != 0);
3042 if (finfo->indices[r_symndx] == -1)
3048 if (finfo->info->strip == strip_all)
3050 /* You can't do ld -r -s. */
3051 bfd_set_error (bfd_error_invalid_operation);
3055 /* This symbol was skipped earlier, but
3056 since it is needed by a reloc, we
3057 must output it now. */
3058 link = symtab_hdr->sh_link;
3059 name = bfd_elf_string_from_elf_section (input_bfd,
3065 osec = sec->output_section;
3067 _bfd_elf_section_from_bfd_section (output_bfd,
3069 if (isym->st_shndx == (unsigned short) -1)
3072 isym->st_value += sec->output_offset;
3073 if (! finfo->info->relocateable)
3074 isym->st_value += osec->vma;
3076 finfo->indices[r_symndx] = output_bfd->symcount;
3078 if (! elf_link_output_sym (finfo, name, isym, sec))
3082 r_symndx = finfo->indices[r_symndx];
3085 irela->r_info = ELF_R_INFO (r_symndx,
3086 ELF_R_TYPE (irela->r_info));
3089 /* Swap out the relocs. */
3090 input_rel_hdr = &elf_section_data (o)->rel_hdr;
3091 output_rel_hdr = &elf_section_data (o->output_section)->rel_hdr;
3092 BFD_ASSERT (output_rel_hdr->sh_entsize
3093 == input_rel_hdr->sh_entsize);
3094 irela = internal_relocs;
3095 irelaend = irela + o->reloc_count;
3096 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
3098 Elf_External_Rel *erel;
3100 erel = ((Elf_External_Rel *) output_rel_hdr->contents
3101 + o->output_section->reloc_count);
3102 for (; irela < irelaend; irela++, erel++)
3104 Elf_Internal_Rel irel;
3106 irel.r_offset = irela->r_offset;
3107 irel.r_info = irela->r_info;
3108 BFD_ASSERT (irela->r_addend == 0);
3109 elf_swap_reloc_out (output_bfd, &irel, erel);
3114 Elf_External_Rela *erela;
3116 BFD_ASSERT (input_rel_hdr->sh_entsize
3117 == sizeof (Elf_External_Rela));
3118 erela = ((Elf_External_Rela *) output_rel_hdr->contents
3119 + o->output_section->reloc_count);
3120 for (; irela < irelaend; irela++, erela++)
3121 elf_swap_reloca_out (output_bfd, irela, erela);
3124 o->output_section->reloc_count += o->reloc_count;
3128 /* Write out the modified section contents. */
3129 if (elf_section_data (o)->stab_info == NULL)
3131 if (! bfd_set_section_contents (output_bfd, o->output_section,
3132 contents, o->output_offset,
3133 (o->_cooked_size != 0
3140 if (! _bfd_write_section_stabs (output_bfd, o,
3141 &elf_section_data (o)->stab_info,
3150 /* Generate a reloc when linking an ELF file. This is a reloc
3151 requested by the linker, and does come from any input file. This
3152 is used to build constructor and destructor tables when linking
3156 elf_reloc_link_order (output_bfd, info, output_section, link_order)
3158 struct bfd_link_info *info;
3159 asection *output_section;
3160 struct bfd_link_order *link_order;
3162 reloc_howto_type *howto;
3166 struct elf_link_hash_entry **rel_hash_ptr;
3167 Elf_Internal_Shdr *rel_hdr;
3169 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
3172 bfd_set_error (bfd_error_bad_value);
3176 addend = link_order->u.reloc.p->addend;
3178 /* Figure out the symbol index. */
3179 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
3180 + output_section->reloc_count);
3181 if (link_order->type == bfd_section_reloc_link_order)
3183 indx = link_order->u.reloc.p->u.section->target_index;
3184 BFD_ASSERT (indx != 0);
3185 *rel_hash_ptr = NULL;
3189 struct elf_link_hash_entry *h;
3191 /* Treat a reloc against a defined symbol as though it were
3192 actually against the section. */
3193 h = ((struct elf_link_hash_entry *)
3194 bfd_wrapped_link_hash_lookup (output_bfd, info,
3195 link_order->u.reloc.p->u.name,
3196 false, false, true));
3198 && (h->root.type == bfd_link_hash_defined
3199 || h->root.type == bfd_link_hash_defweak))
3203 section = h->root.u.def.section;
3204 indx = section->output_section->target_index;
3205 *rel_hash_ptr = NULL;
3206 /* It seems that we ought to add the symbol value to the
3207 addend here, but in practice it has already been added
3208 because it was passed to constructor_callback. */
3209 addend += section->output_section->vma + section->output_offset;
3213 /* Setting the index to -2 tells elf_link_output_extsym that
3214 this symbol is used by a reloc. */
3221 if (! ((*info->callbacks->unattached_reloc)
3222 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
3223 (asection *) NULL, (bfd_vma) 0)))
3229 /* If this is an inplace reloc, we must write the addend into the
3231 if (howto->partial_inplace && addend != 0)
3234 bfd_reloc_status_type rstat;
3238 size = bfd_get_reloc_size (howto);
3239 buf = (bfd_byte *) bfd_zmalloc (size);
3240 if (buf == (bfd_byte *) NULL)
3242 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
3248 case bfd_reloc_outofrange:
3250 case bfd_reloc_overflow:
3251 if (! ((*info->callbacks->reloc_overflow)
3253 (link_order->type == bfd_section_reloc_link_order
3254 ? bfd_section_name (output_bfd,
3255 link_order->u.reloc.p->u.section)
3256 : link_order->u.reloc.p->u.name),
3257 howto->name, addend, (bfd *) NULL, (asection *) NULL,
3265 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
3266 (file_ptr) link_order->offset, size);
3272 /* The address of a reloc is relative to the section in a
3273 relocateable file, and is a virtual address in an executable
3275 offset = link_order->offset;
3276 if (! info->relocateable)
3277 offset += output_section->vma;
3279 rel_hdr = &elf_section_data (output_section)->rel_hdr;
3281 if (rel_hdr->sh_type == SHT_REL)
3283 Elf_Internal_Rel irel;
3284 Elf_External_Rel *erel;
3286 irel.r_offset = offset;
3287 irel.r_info = ELF_R_INFO (indx, howto->type);
3288 erel = ((Elf_External_Rel *) rel_hdr->contents
3289 + output_section->reloc_count);
3290 elf_swap_reloc_out (output_bfd, &irel, erel);
3294 Elf_Internal_Rela irela;
3295 Elf_External_Rela *erela;
3297 irela.r_offset = offset;
3298 irela.r_info = ELF_R_INFO (indx, howto->type);
3299 irela.r_addend = addend;
3300 erela = ((Elf_External_Rela *) rel_hdr->contents
3301 + output_section->reloc_count);
3302 elf_swap_reloca_out (output_bfd, &irela, erela);
3305 ++output_section->reloc_count;
3311 /* Allocate a pointer to live in a linker created section. */
3314 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
3316 struct bfd_link_info *info;
3317 elf_linker_section_t *lsect;
3318 struct elf_link_hash_entry *h;
3319 const Elf_Internal_Rela *rel;
3321 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
3322 elf_linker_section_pointers_t *linker_section_ptr;
3323 unsigned long r_symndx = ELF_R_SYM (rel->r_info);;
3325 BFD_ASSERT (lsect != NULL);
3327 /* Is this a global symbol? */
3330 /* Has this symbol already been allocated, if so, our work is done */
3331 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
3336 ptr_linker_section_ptr = &h->linker_section_pointer;
3337 /* Make sure this symbol is output as a dynamic symbol. */
3338 if (h->dynindx == -1)
3340 if (! elf_link_record_dynamic_symbol (info, h))
3344 if (lsect->rel_section)
3345 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
3348 else /* Allocation of a pointer to a local symbol */
3350 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
3352 /* Allocate a table to hold the local symbols if first time */
3355 int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
3356 register unsigned int i;
3358 ptr = (elf_linker_section_pointers_t **)
3359 bfd_alloc (abfd, num_symbols * sizeof (elf_linker_section_pointers_t *));
3364 elf_local_ptr_offsets (abfd) = ptr;
3365 for (i = 0; i < num_symbols; i++)
3366 ptr[i] = (elf_linker_section_pointers_t *)0;
3369 /* Has this symbol already been allocated, if so, our work is done */
3370 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
3375 ptr_linker_section_ptr = &ptr[r_symndx];
3379 /* If we are generating a shared object, we need to
3380 output a R_<xxx>_RELATIVE reloc so that the
3381 dynamic linker can adjust this GOT entry. */
3382 BFD_ASSERT (lsect->rel_section != NULL);
3383 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
3387 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
3388 from internal memory. */
3389 BFD_ASSERT (ptr_linker_section_ptr != NULL);
3390 linker_section_ptr = (elf_linker_section_pointers_t *)
3391 bfd_alloc (abfd, sizeof (elf_linker_section_pointers_t));
3393 if (!linker_section_ptr)
3396 linker_section_ptr->next = *ptr_linker_section_ptr;
3397 linker_section_ptr->addend = rel->r_addend;
3398 linker_section_ptr->which = lsect->which;
3399 linker_section_ptr->written_address_p = false;
3400 *ptr_linker_section_ptr = linker_section_ptr;
3403 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
3405 linker_section_ptr->offset = lsect->section->_raw_size - lsect->hole_size + (ARCH_SIZE / 8);
3406 lsect->hole_offset += ARCH_SIZE / 8;
3407 lsect->sym_offset += ARCH_SIZE / 8;
3408 if (lsect->sym_hash) /* Bump up symbol value if needed */
3410 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
3412 fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
3413 lsect->sym_hash->root.root.string,
3414 (long)ARCH_SIZE / 8,
3415 (long)lsect->sym_hash->root.u.def.value);
3421 linker_section_ptr->offset = lsect->section->_raw_size;
3423 lsect->section->_raw_size += ARCH_SIZE / 8;
3426 fprintf (stderr, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
3427 lsect->name, (long)linker_section_ptr->offset, (long)lsect->section->_raw_size);
3435 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
3438 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
3441 /* Fill in the address for a pointer generated in alinker section. */
3444 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h, relocation, rel, relative_reloc)
3447 struct bfd_link_info *info;
3448 elf_linker_section_t *lsect;
3449 struct elf_link_hash_entry *h;
3451 const Elf_Internal_Rela *rel;
3454 elf_linker_section_pointers_t *linker_section_ptr;
3456 BFD_ASSERT (lsect != NULL);
3458 if (h != NULL) /* global symbol */
3460 linker_section_ptr = _bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
3464 BFD_ASSERT (linker_section_ptr != NULL);
3466 if (! elf_hash_table (info)->dynamic_sections_created
3469 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
3471 /* This is actually a static link, or it is a
3472 -Bsymbolic link and the symbol is defined
3473 locally. We must initialize this entry in the
3476 When doing a dynamic link, we create a .rela.<xxx>
3477 relocation entry to initialize the value. This
3478 is done in the finish_dynamic_symbol routine. */
3479 if (!linker_section_ptr->written_address_p)
3481 linker_section_ptr->written_address_p = true;
3482 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
3483 lsect->section->contents + linker_section_ptr->offset);
3487 else /* local symbol */
3489 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
3490 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
3491 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
3492 linker_section_ptr = _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd)[r_symndx],
3496 BFD_ASSERT (linker_section_ptr != NULL);
3498 /* Write out pointer if it hasn't been rewritten out before */
3499 if (!linker_section_ptr->written_address_p)
3501 linker_section_ptr->written_address_p = true;
3502 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
3503 lsect->section->contents + linker_section_ptr->offset);
3507 asection *srel = lsect->rel_section;
3508 Elf_Internal_Rela outrel;
3510 /* We need to generate a relative reloc for the dynamic linker. */
3512 lsect->rel_section = srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
3515 BFD_ASSERT (srel != NULL);
3517 outrel.r_offset = (lsect->section->output_section->vma
3518 + lsect->section->output_offset
3519 + linker_section_ptr->offset);
3520 outrel.r_info = ELF_R_INFO (0, relative_reloc);
3521 outrel.r_addend = 0;
3522 elf_swap_reloca_out (output_bfd, &outrel,
3523 (((Elf_External_Rela *)
3524 lsect->section->contents)
3525 + lsect->section->reloc_count));
3526 ++lsect->section->reloc_count;
3531 relocation = (lsect->section->output_offset
3532 + linker_section_ptr->offset
3533 - lsect->hole_offset
3534 - lsect->sym_offset);
3537 fprintf (stderr, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
3538 lsect->name, (long)relocation, (long)relocation);
3541 /* Subtract out the addend, because it will get added back in by the normal
3543 return relocation - linker_section_ptr->addend;