1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2016 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
23 #include "bfd_stdint.h"
28 #include "safe-ctype.h"
29 #include "libiberty.h"
32 /* This struct is used to pass information to routines called via
33 elf_link_hash_traverse which must return failure. */
35 struct elf_info_failed
37 struct bfd_link_info *info;
41 /* This structure is used to pass information to
42 _bfd_elf_link_find_version_dependencies. */
44 struct elf_find_verdep_info
46 /* General link information. */
47 struct bfd_link_info *info;
48 /* The number of dependencies. */
50 /* Whether we had a failure. */
54 static bfd_boolean _bfd_elf_fix_symbol_flags
55 (struct elf_link_hash_entry *, struct elf_info_failed *);
58 _bfd_elf_section_for_symbol (struct elf_reloc_cookie *cookie,
59 unsigned long r_symndx,
62 if (r_symndx >= cookie->locsymcount
63 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
65 struct elf_link_hash_entry *h;
67 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
69 while (h->root.type == bfd_link_hash_indirect
70 || h->root.type == bfd_link_hash_warning)
71 h = (struct elf_link_hash_entry *) h->root.u.i.link;
73 if ((h->root.type == bfd_link_hash_defined
74 || h->root.type == bfd_link_hash_defweak)
75 && discarded_section (h->root.u.def.section))
76 return h->root.u.def.section;
82 /* It's not a relocation against a global symbol,
83 but it could be a relocation against a local
84 symbol for a discarded section. */
86 Elf_Internal_Sym *isym;
88 /* Need to: get the symbol; get the section. */
89 isym = &cookie->locsyms[r_symndx];
90 isec = bfd_section_from_elf_index (cookie->abfd, isym->st_shndx);
92 && discard ? discarded_section (isec) : 1)
98 /* Define a symbol in a dynamic linkage section. */
100 struct elf_link_hash_entry *
101 _bfd_elf_define_linkage_sym (bfd *abfd,
102 struct bfd_link_info *info,
106 struct elf_link_hash_entry *h;
107 struct bfd_link_hash_entry *bh;
108 const struct elf_backend_data *bed;
110 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
113 /* Zap symbol defined in an as-needed lib that wasn't linked.
114 This is a symptom of a larger problem: Absolute symbols
115 defined in shared libraries can't be overridden, because we
116 lose the link to the bfd which is via the symbol section. */
117 h->root.type = bfd_link_hash_new;
121 bed = get_elf_backend_data (abfd);
122 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
123 sec, 0, NULL, FALSE, bed->collect,
126 h = (struct elf_link_hash_entry *) bh;
129 h->root.linker_def = 1;
130 h->type = STT_OBJECT;
131 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
132 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
134 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
139 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
143 struct elf_link_hash_entry *h;
144 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
145 struct elf_link_hash_table *htab = elf_hash_table (info);
147 /* This function may be called more than once. */
148 s = bfd_get_linker_section (abfd, ".got");
152 flags = bed->dynamic_sec_flags;
154 s = bfd_make_section_anyway_with_flags (abfd,
155 (bed->rela_plts_and_copies_p
156 ? ".rela.got" : ".rel.got"),
157 (bed->dynamic_sec_flags
160 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
164 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
166 || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
170 if (bed->want_got_plt)
172 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
174 || !bfd_set_section_alignment (abfd, s,
175 bed->s->log_file_align))
180 /* The first bit of the global offset table is the header. */
181 s->size += bed->got_header_size;
183 if (bed->want_got_sym)
185 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
186 (or .got.plt) section. We don't do this in the linker script
187 because we don't want to define the symbol if we are not creating
188 a global offset table. */
189 h = _bfd_elf_define_linkage_sym (abfd, info, s,
190 "_GLOBAL_OFFSET_TABLE_");
191 elf_hash_table (info)->hgot = h;
199 /* Create a strtab to hold the dynamic symbol names. */
201 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
203 struct elf_link_hash_table *hash_table;
205 hash_table = elf_hash_table (info);
206 if (hash_table->dynobj == NULL)
207 hash_table->dynobj = abfd;
209 if (hash_table->dynstr == NULL)
211 hash_table->dynstr = _bfd_elf_strtab_init ();
212 if (hash_table->dynstr == NULL)
218 /* Create some sections which will be filled in with dynamic linking
219 information. ABFD is an input file which requires dynamic sections
220 to be created. The dynamic sections take up virtual memory space
221 when the final executable is run, so we need to create them before
222 addresses are assigned to the output sections. We work out the
223 actual contents and size of these sections later. */
226 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
230 const struct elf_backend_data *bed;
231 struct elf_link_hash_entry *h;
233 if (! is_elf_hash_table (info->hash))
236 if (elf_hash_table (info)->dynamic_sections_created)
239 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
242 abfd = elf_hash_table (info)->dynobj;
243 bed = get_elf_backend_data (abfd);
245 flags = bed->dynamic_sec_flags;
247 /* A dynamically linked executable has a .interp section, but a
248 shared library does not. */
249 if (bfd_link_executable (info) && !info->nointerp)
251 s = bfd_make_section_anyway_with_flags (abfd, ".interp",
252 flags | SEC_READONLY);
257 /* Create sections to hold version informations. These are removed
258 if they are not needed. */
259 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d",
260 flags | SEC_READONLY);
262 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
265 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version",
266 flags | SEC_READONLY);
268 || ! bfd_set_section_alignment (abfd, s, 1))
271 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r",
272 flags | SEC_READONLY);
274 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
277 s = bfd_make_section_anyway_with_flags (abfd, ".dynsym",
278 flags | SEC_READONLY);
280 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
282 elf_hash_table (info)->dynsym = s;
284 s = bfd_make_section_anyway_with_flags (abfd, ".dynstr",
285 flags | SEC_READONLY);
289 s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags);
291 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
294 /* The special symbol _DYNAMIC is always set to the start of the
295 .dynamic section. We could set _DYNAMIC in a linker script, but we
296 only want to define it if we are, in fact, creating a .dynamic
297 section. We don't want to define it if there is no .dynamic
298 section, since on some ELF platforms the start up code examines it
299 to decide how to initialize the process. */
300 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC");
301 elf_hash_table (info)->hdynamic = h;
307 s = bfd_make_section_anyway_with_flags (abfd, ".hash",
308 flags | SEC_READONLY);
310 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
312 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
315 if (info->emit_gnu_hash)
317 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
318 flags | SEC_READONLY);
320 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
322 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
323 4 32-bit words followed by variable count of 64-bit words, then
324 variable count of 32-bit words. */
325 if (bed->s->arch_size == 64)
326 elf_section_data (s)->this_hdr.sh_entsize = 0;
328 elf_section_data (s)->this_hdr.sh_entsize = 4;
331 /* Let the backend create the rest of the sections. This lets the
332 backend set the right flags. The backend will normally create
333 the .got and .plt sections. */
334 if (bed->elf_backend_create_dynamic_sections == NULL
335 || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
338 elf_hash_table (info)->dynamic_sections_created = TRUE;
343 /* Create dynamic sections when linking against a dynamic object. */
346 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
348 flagword flags, pltflags;
349 struct elf_link_hash_entry *h;
351 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
352 struct elf_link_hash_table *htab = elf_hash_table (info);
354 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
355 .rel[a].bss sections. */
356 flags = bed->dynamic_sec_flags;
359 if (bed->plt_not_loaded)
360 /* We do not clear SEC_ALLOC here because we still want the OS to
361 allocate space for the section; it's just that there's nothing
362 to read in from the object file. */
363 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
365 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
366 if (bed->plt_readonly)
367 pltflags |= SEC_READONLY;
369 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
371 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
375 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
377 if (bed->want_plt_sym)
379 h = _bfd_elf_define_linkage_sym (abfd, info, s,
380 "_PROCEDURE_LINKAGE_TABLE_");
381 elf_hash_table (info)->hplt = h;
386 s = bfd_make_section_anyway_with_flags (abfd,
387 (bed->rela_plts_and_copies_p
388 ? ".rela.plt" : ".rel.plt"),
389 flags | SEC_READONLY);
391 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
395 if (! _bfd_elf_create_got_section (abfd, info))
398 if (bed->want_dynbss)
400 /* The .dynbss section is a place to put symbols which are defined
401 by dynamic objects, are referenced by regular objects, and are
402 not functions. We must allocate space for them in the process
403 image and use a R_*_COPY reloc to tell the dynamic linker to
404 initialize them at run time. The linker script puts the .dynbss
405 section into the .bss section of the final image. */
406 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
407 (SEC_ALLOC | SEC_LINKER_CREATED));
411 /* The .rel[a].bss section holds copy relocs. This section is not
412 normally needed. We need to create it here, though, so that the
413 linker will map it to an output section. We can't just create it
414 only if we need it, because we will not know whether we need it
415 until we have seen all the input files, and the first time the
416 main linker code calls BFD after examining all the input files
417 (size_dynamic_sections) the input sections have already been
418 mapped to the output sections. If the section turns out not to
419 be needed, we can discard it later. We will never need this
420 section when generating a shared object, since they do not use
422 if (! bfd_link_pic (info))
424 s = bfd_make_section_anyway_with_flags (abfd,
425 (bed->rela_plts_and_copies_p
426 ? ".rela.bss" : ".rel.bss"),
427 flags | SEC_READONLY);
429 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
437 /* Record a new dynamic symbol. We record the dynamic symbols as we
438 read the input files, since we need to have a list of all of them
439 before we can determine the final sizes of the output sections.
440 Note that we may actually call this function even though we are not
441 going to output any dynamic symbols; in some cases we know that a
442 symbol should be in the dynamic symbol table, but only if there is
446 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
447 struct elf_link_hash_entry *h)
449 if (h->dynindx == -1)
451 struct elf_strtab_hash *dynstr;
456 /* XXX: The ABI draft says the linker must turn hidden and
457 internal symbols into STB_LOCAL symbols when producing the
458 DSO. However, if ld.so honors st_other in the dynamic table,
459 this would not be necessary. */
460 switch (ELF_ST_VISIBILITY (h->other))
464 if (h->root.type != bfd_link_hash_undefined
465 && h->root.type != bfd_link_hash_undefweak)
468 if (!elf_hash_table (info)->is_relocatable_executable)
476 h->dynindx = elf_hash_table (info)->dynsymcount;
477 ++elf_hash_table (info)->dynsymcount;
479 dynstr = elf_hash_table (info)->dynstr;
482 /* Create a strtab to hold the dynamic symbol names. */
483 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
488 /* We don't put any version information in the dynamic string
490 name = h->root.root.string;
491 p = strchr (name, ELF_VER_CHR);
493 /* We know that the p points into writable memory. In fact,
494 there are only a few symbols that have read-only names, being
495 those like _GLOBAL_OFFSET_TABLE_ that are created specially
496 by the backends. Most symbols will have names pointing into
497 an ELF string table read from a file, or to objalloc memory. */
500 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
505 if (indx == (bfd_size_type) -1)
507 h->dynstr_index = indx;
513 /* Mark a symbol dynamic. */
516 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
517 struct elf_link_hash_entry *h,
518 Elf_Internal_Sym *sym)
520 struct bfd_elf_dynamic_list *d = info->dynamic_list;
522 /* It may be called more than once on the same H. */
523 if(h->dynamic || bfd_link_relocatable (info))
526 if ((info->dynamic_data
527 && (h->type == STT_OBJECT
528 || h->type == STT_COMMON
530 && (ELF_ST_TYPE (sym->st_info) == STT_OBJECT
531 || ELF_ST_TYPE (sym->st_info) == STT_COMMON))))
533 && h->root.type == bfd_link_hash_new
534 && (*d->match) (&d->head, NULL, h->root.root.string)))
538 /* Record an assignment to a symbol made by a linker script. We need
539 this in case some dynamic object refers to this symbol. */
542 bfd_elf_record_link_assignment (bfd *output_bfd,
543 struct bfd_link_info *info,
548 struct elf_link_hash_entry *h, *hv;
549 struct elf_link_hash_table *htab;
550 const struct elf_backend_data *bed;
552 if (!is_elf_hash_table (info->hash))
555 htab = elf_hash_table (info);
556 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
560 if (h->versioned == unknown)
562 /* Set versioned if symbol version is unknown. */
563 char *version = strrchr (name, ELF_VER_CHR);
566 if (version > name && version[-1] != ELF_VER_CHR)
567 h->versioned = versioned_hidden;
569 h->versioned = versioned;
573 switch (h->root.type)
575 case bfd_link_hash_defined:
576 case bfd_link_hash_defweak:
577 case bfd_link_hash_common:
579 case bfd_link_hash_undefweak:
580 case bfd_link_hash_undefined:
581 /* Since we're defining the symbol, don't let it seem to have not
582 been defined. record_dynamic_symbol and size_dynamic_sections
583 may depend on this. */
584 h->root.type = bfd_link_hash_new;
585 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
586 bfd_link_repair_undef_list (&htab->root);
588 case bfd_link_hash_new:
589 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
592 case bfd_link_hash_indirect:
593 /* We had a versioned symbol in a dynamic library. We make the
594 the versioned symbol point to this one. */
595 bed = get_elf_backend_data (output_bfd);
597 while (hv->root.type == bfd_link_hash_indirect
598 || hv->root.type == bfd_link_hash_warning)
599 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
600 /* We don't need to update h->root.u since linker will set them
602 h->root.type = bfd_link_hash_undefined;
603 hv->root.type = bfd_link_hash_indirect;
604 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
605 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
607 case bfd_link_hash_warning:
612 /* If this symbol is being provided by the linker script, and it is
613 currently defined by a dynamic object, but not by a regular
614 object, then mark it as undefined so that the generic linker will
615 force the correct value. */
619 h->root.type = bfd_link_hash_undefined;
621 /* If this symbol is not being provided by the linker script, and it is
622 currently defined by a dynamic object, but not by a regular object,
623 then clear out any version information because the symbol will not be
624 associated with the dynamic object any more. */
628 h->verinfo.verdef = NULL;
634 bed = get_elf_backend_data (output_bfd);
635 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
636 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
637 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
640 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
642 if (!bfd_link_relocatable (info)
644 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
645 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
650 || bfd_link_dll (info)
651 || elf_hash_table (info)->is_relocatable_executable)
654 if (! bfd_elf_link_record_dynamic_symbol (info, h))
657 /* If this is a weak defined symbol, and we know a corresponding
658 real symbol from the same dynamic object, make sure the real
659 symbol is also made into a dynamic symbol. */
660 if (h->u.weakdef != NULL
661 && h->u.weakdef->dynindx == -1)
663 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
671 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
672 success, and 2 on a failure caused by attempting to record a symbol
673 in a discarded section, eg. a discarded link-once section symbol. */
676 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
681 struct elf_link_local_dynamic_entry *entry;
682 struct elf_link_hash_table *eht;
683 struct elf_strtab_hash *dynstr;
684 unsigned long dynstr_index;
686 Elf_External_Sym_Shndx eshndx;
687 char esym[sizeof (Elf64_External_Sym)];
689 if (! is_elf_hash_table (info->hash))
692 /* See if the entry exists already. */
693 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
694 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
697 amt = sizeof (*entry);
698 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
702 /* Go find the symbol, so that we can find it's name. */
703 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
704 1, input_indx, &entry->isym, esym, &eshndx))
706 bfd_release (input_bfd, entry);
710 if (entry->isym.st_shndx != SHN_UNDEF
711 && entry->isym.st_shndx < SHN_LORESERVE)
715 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
716 if (s == NULL || bfd_is_abs_section (s->output_section))
718 /* We can still bfd_release here as nothing has done another
719 bfd_alloc. We can't do this later in this function. */
720 bfd_release (input_bfd, entry);
725 name = (bfd_elf_string_from_elf_section
726 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
727 entry->isym.st_name));
729 dynstr = elf_hash_table (info)->dynstr;
732 /* Create a strtab to hold the dynamic symbol names. */
733 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
738 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
739 if (dynstr_index == (unsigned long) -1)
741 entry->isym.st_name = dynstr_index;
743 eht = elf_hash_table (info);
745 entry->next = eht->dynlocal;
746 eht->dynlocal = entry;
747 entry->input_bfd = input_bfd;
748 entry->input_indx = input_indx;
751 /* Whatever binding the symbol had before, it's now local. */
753 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
755 /* The dynindx will be set at the end of size_dynamic_sections. */
760 /* Return the dynindex of a local dynamic symbol. */
763 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
767 struct elf_link_local_dynamic_entry *e;
769 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
770 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
775 /* This function is used to renumber the dynamic symbols, if some of
776 them are removed because they are marked as local. This is called
777 via elf_link_hash_traverse. */
780 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
783 size_t *count = (size_t *) data;
788 if (h->dynindx != -1)
789 h->dynindx = ++(*count);
795 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
796 STB_LOCAL binding. */
799 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
802 size_t *count = (size_t *) data;
804 if (!h->forced_local)
807 if (h->dynindx != -1)
808 h->dynindx = ++(*count);
813 /* Return true if the dynamic symbol for a given section should be
814 omitted when creating a shared library. */
816 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
817 struct bfd_link_info *info,
820 struct elf_link_hash_table *htab;
823 switch (elf_section_data (p)->this_hdr.sh_type)
827 /* If sh_type is yet undecided, assume it could be
828 SHT_PROGBITS/SHT_NOBITS. */
830 htab = elf_hash_table (info);
831 if (p == htab->tls_sec)
834 if (htab->text_index_section != NULL)
835 return p != htab->text_index_section && p != htab->data_index_section;
837 return (htab->dynobj != NULL
838 && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
839 && ip->output_section == p);
841 /* There shouldn't be section relative relocations
842 against any other section. */
848 /* Assign dynsym indices. In a shared library we generate a section
849 symbol for each output section, which come first. Next come symbols
850 which have been forced to local binding. Then all of the back-end
851 allocated local dynamic syms, followed by the rest of the global
855 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
856 struct bfd_link_info *info,
857 unsigned long *section_sym_count)
859 unsigned long dynsymcount = 0;
861 if (bfd_link_pic (info)
862 || elf_hash_table (info)->is_relocatable_executable)
864 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
866 for (p = output_bfd->sections; p ; p = p->next)
867 if ((p->flags & SEC_EXCLUDE) == 0
868 && (p->flags & SEC_ALLOC) != 0
869 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
870 elf_section_data (p)->dynindx = ++dynsymcount;
872 elf_section_data (p)->dynindx = 0;
874 *section_sym_count = dynsymcount;
876 elf_link_hash_traverse (elf_hash_table (info),
877 elf_link_renumber_local_hash_table_dynsyms,
880 if (elf_hash_table (info)->dynlocal)
882 struct elf_link_local_dynamic_entry *p;
883 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
884 p->dynindx = ++dynsymcount;
887 elf_link_hash_traverse (elf_hash_table (info),
888 elf_link_renumber_hash_table_dynsyms,
891 /* There is an unused NULL entry at the head of the table which
892 we must account for in our count. We always create the dynsym
893 section, even if it is empty, with dynamic sections. */
894 if (elf_hash_table (info)->dynamic_sections_created)
897 elf_hash_table (info)->dynsymcount = dynsymcount;
901 /* Merge st_other field. */
904 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
905 const Elf_Internal_Sym *isym, asection *sec,
906 bfd_boolean definition, bfd_boolean dynamic)
908 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
910 /* If st_other has a processor-specific meaning, specific
911 code might be needed here. */
912 if (bed->elf_backend_merge_symbol_attribute)
913 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
918 unsigned symvis = ELF_ST_VISIBILITY (isym->st_other);
919 unsigned hvis = ELF_ST_VISIBILITY (h->other);
921 /* Keep the most constraining visibility. Leave the remainder
922 of the st_other field to elf_backend_merge_symbol_attribute. */
923 if (symvis - 1 < hvis - 1)
924 h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
927 && ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT
928 && (sec->flags & SEC_READONLY) == 0)
929 h->protected_def = 1;
932 /* This function is called when we want to merge a new symbol with an
933 existing symbol. It handles the various cases which arise when we
934 find a definition in a dynamic object, or when there is already a
935 definition in a dynamic object. The new symbol is described by
936 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
937 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
938 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
939 of an old common symbol. We set OVERRIDE if the old symbol is
940 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
941 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
942 to change. By OK to change, we mean that we shouldn't warn if the
943 type or size does change. */
946 _bfd_elf_merge_symbol (bfd *abfd,
947 struct bfd_link_info *info,
949 Elf_Internal_Sym *sym,
952 struct elf_link_hash_entry **sym_hash,
954 bfd_boolean *pold_weak,
955 unsigned int *pold_alignment,
957 bfd_boolean *override,
958 bfd_boolean *type_change_ok,
959 bfd_boolean *size_change_ok,
960 bfd_boolean *matched)
962 asection *sec, *oldsec;
963 struct elf_link_hash_entry *h;
964 struct elf_link_hash_entry *hi;
965 struct elf_link_hash_entry *flip;
968 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
969 bfd_boolean newweak, oldweak, newfunc, oldfunc;
970 const struct elf_backend_data *bed;
977 bind = ELF_ST_BIND (sym->st_info);
979 if (! bfd_is_und_section (sec))
980 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
982 h = ((struct elf_link_hash_entry *)
983 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
988 bed = get_elf_backend_data (abfd);
990 /* NEW_VERSION is the symbol version of the new symbol. */
991 if (h->versioned != unversioned)
993 /* Symbol version is unknown or versioned. */
994 new_version = strrchr (name, ELF_VER_CHR);
997 if (h->versioned == unknown)
999 if (new_version > name && new_version[-1] != ELF_VER_CHR)
1000 h->versioned = versioned_hidden;
1002 h->versioned = versioned;
1005 if (new_version[0] == '\0')
1009 h->versioned = unversioned;
1014 /* For merging, we only care about real symbols. But we need to make
1015 sure that indirect symbol dynamic flags are updated. */
1017 while (h->root.type == bfd_link_hash_indirect
1018 || h->root.type == bfd_link_hash_warning)
1019 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1023 if (hi == h || h->root.type == bfd_link_hash_new)
1027 /* OLD_HIDDEN is true if the existing symbol is only visible
1028 to the symbol with the same symbol version. NEW_HIDDEN is
1029 true if the new symbol is only visible to the symbol with
1030 the same symbol version. */
1031 bfd_boolean old_hidden = h->versioned == versioned_hidden;
1032 bfd_boolean new_hidden = hi->versioned == versioned_hidden;
1033 if (!old_hidden && !new_hidden)
1034 /* The new symbol matches the existing symbol if both
1039 /* OLD_VERSION is the symbol version of the existing
1043 if (h->versioned >= versioned)
1044 old_version = strrchr (h->root.root.string,
1049 /* The new symbol matches the existing symbol if they
1050 have the same symbol version. */
1051 *matched = (old_version == new_version
1052 || (old_version != NULL
1053 && new_version != NULL
1054 && strcmp (old_version, new_version) == 0));
1059 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1064 switch (h->root.type)
1069 case bfd_link_hash_undefined:
1070 case bfd_link_hash_undefweak:
1071 oldbfd = h->root.u.undef.abfd;
1074 case bfd_link_hash_defined:
1075 case bfd_link_hash_defweak:
1076 oldbfd = h->root.u.def.section->owner;
1077 oldsec = h->root.u.def.section;
1080 case bfd_link_hash_common:
1081 oldbfd = h->root.u.c.p->section->owner;
1082 oldsec = h->root.u.c.p->section;
1084 *pold_alignment = h->root.u.c.p->alignment_power;
1087 if (poldbfd && *poldbfd == NULL)
1090 /* Differentiate strong and weak symbols. */
1091 newweak = bind == STB_WEAK;
1092 oldweak = (h->root.type == bfd_link_hash_defweak
1093 || h->root.type == bfd_link_hash_undefweak);
1095 *pold_weak = oldweak;
1097 /* This code is for coping with dynamic objects, and is only useful
1098 if we are doing an ELF link. */
1099 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
1102 /* We have to check it for every instance since the first few may be
1103 references and not all compilers emit symbol type for undefined
1105 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
1107 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1108 respectively, is from a dynamic object. */
1110 newdyn = (abfd->flags & DYNAMIC) != 0;
1112 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1113 syms and defined syms in dynamic libraries respectively.
1114 ref_dynamic on the other hand can be set for a symbol defined in
1115 a dynamic library, and def_dynamic may not be set; When the
1116 definition in a dynamic lib is overridden by a definition in the
1117 executable use of the symbol in the dynamic lib becomes a
1118 reference to the executable symbol. */
1121 if (bfd_is_und_section (sec))
1123 if (bind != STB_WEAK)
1125 h->ref_dynamic_nonweak = 1;
1126 hi->ref_dynamic_nonweak = 1;
1131 /* Update the existing symbol only if they match. */
1134 hi->dynamic_def = 1;
1138 /* If we just created the symbol, mark it as being an ELF symbol.
1139 Other than that, there is nothing to do--there is no merge issue
1140 with a newly defined symbol--so we just return. */
1142 if (h->root.type == bfd_link_hash_new)
1148 /* In cases involving weak versioned symbols, we may wind up trying
1149 to merge a symbol with itself. Catch that here, to avoid the
1150 confusion that results if we try to override a symbol with
1151 itself. The additional tests catch cases like
1152 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1153 dynamic object, which we do want to handle here. */
1155 && (newweak || oldweak)
1156 && ((abfd->flags & DYNAMIC) == 0
1157 || !h->def_regular))
1162 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1163 else if (oldsec != NULL)
1165 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1166 indices used by MIPS ELF. */
1167 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1170 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1171 respectively, appear to be a definition rather than reference. */
1173 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1175 olddef = (h->root.type != bfd_link_hash_undefined
1176 && h->root.type != bfd_link_hash_undefweak
1177 && h->root.type != bfd_link_hash_common);
1179 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1180 respectively, appear to be a function. */
1182 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1183 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1185 oldfunc = (h->type != STT_NOTYPE
1186 && bed->is_function_type (h->type));
1188 /* When we try to create a default indirect symbol from the dynamic
1189 definition with the default version, we skip it if its type and
1190 the type of existing regular definition mismatch. */
1191 if (pold_alignment == NULL
1195 && (((olddef || h->root.type == bfd_link_hash_common)
1196 && ELF_ST_TYPE (sym->st_info) != h->type
1197 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1198 && h->type != STT_NOTYPE
1199 && !(newfunc && oldfunc))
1201 && ((h->type == STT_GNU_IFUNC)
1202 != (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)))))
1208 /* Check TLS symbols. We don't check undefined symbols introduced
1209 by "ld -u" which have no type (and oldbfd NULL), and we don't
1210 check symbols from plugins because they also have no type. */
1212 && (oldbfd->flags & BFD_PLUGIN) == 0
1213 && (abfd->flags & BFD_PLUGIN) == 0
1214 && ELF_ST_TYPE (sym->st_info) != h->type
1215 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1218 bfd_boolean ntdef, tdef;
1219 asection *ntsec, *tsec;
1221 if (h->type == STT_TLS)
1241 (*_bfd_error_handler)
1242 (_("%s: TLS definition in %B section %A "
1243 "mismatches non-TLS definition in %B section %A"),
1244 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1245 else if (!tdef && !ntdef)
1246 (*_bfd_error_handler)
1247 (_("%s: TLS reference in %B "
1248 "mismatches non-TLS reference in %B"),
1249 tbfd, ntbfd, h->root.root.string);
1251 (*_bfd_error_handler)
1252 (_("%s: TLS definition in %B section %A "
1253 "mismatches non-TLS reference in %B"),
1254 tbfd, tsec, ntbfd, h->root.root.string);
1256 (*_bfd_error_handler)
1257 (_("%s: TLS reference in %B "
1258 "mismatches non-TLS definition in %B section %A"),
1259 tbfd, ntbfd, ntsec, h->root.root.string);
1261 bfd_set_error (bfd_error_bad_value);
1265 /* If the old symbol has non-default visibility, we ignore the new
1266 definition from a dynamic object. */
1268 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1269 && !bfd_is_und_section (sec))
1272 /* Make sure this symbol is dynamic. */
1274 hi->ref_dynamic = 1;
1275 /* A protected symbol has external availability. Make sure it is
1276 recorded as dynamic.
1278 FIXME: Should we check type and size for protected symbol? */
1279 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1280 return bfd_elf_link_record_dynamic_symbol (info, h);
1285 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1288 /* If the new symbol with non-default visibility comes from a
1289 relocatable file and the old definition comes from a dynamic
1290 object, we remove the old definition. */
1291 if (hi->root.type == bfd_link_hash_indirect)
1293 /* Handle the case where the old dynamic definition is
1294 default versioned. We need to copy the symbol info from
1295 the symbol with default version to the normal one if it
1296 was referenced before. */
1299 hi->root.type = h->root.type;
1300 h->root.type = bfd_link_hash_indirect;
1301 (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
1303 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1304 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1306 /* If the new symbol is hidden or internal, completely undo
1307 any dynamic link state. */
1308 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1309 h->forced_local = 0;
1316 /* FIXME: Should we check type and size for protected symbol? */
1326 /* If the old symbol was undefined before, then it will still be
1327 on the undefs list. If the new symbol is undefined or
1328 common, we can't make it bfd_link_hash_new here, because new
1329 undefined or common symbols will be added to the undefs list
1330 by _bfd_generic_link_add_one_symbol. Symbols may not be
1331 added twice to the undefs list. Also, if the new symbol is
1332 undefweak then we don't want to lose the strong undef. */
1333 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1335 h->root.type = bfd_link_hash_undefined;
1336 h->root.u.undef.abfd = abfd;
1340 h->root.type = bfd_link_hash_new;
1341 h->root.u.undef.abfd = NULL;
1344 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1346 /* If the new symbol is hidden or internal, completely undo
1347 any dynamic link state. */
1348 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1349 h->forced_local = 0;
1355 /* FIXME: Should we check type and size for protected symbol? */
1361 /* If a new weak symbol definition comes from a regular file and the
1362 old symbol comes from a dynamic library, we treat the new one as
1363 strong. Similarly, an old weak symbol definition from a regular
1364 file is treated as strong when the new symbol comes from a dynamic
1365 library. Further, an old weak symbol from a dynamic library is
1366 treated as strong if the new symbol is from a dynamic library.
1367 This reflects the way glibc's ld.so works.
1369 Do this before setting *type_change_ok or *size_change_ok so that
1370 we warn properly when dynamic library symbols are overridden. */
1372 if (newdef && !newdyn && olddyn)
1374 if (olddef && newdyn)
1377 /* Allow changes between different types of function symbol. */
1378 if (newfunc && oldfunc)
1379 *type_change_ok = TRUE;
1381 /* It's OK to change the type if either the existing symbol or the
1382 new symbol is weak. A type change is also OK if the old symbol
1383 is undefined and the new symbol is defined. */
1388 && h->root.type == bfd_link_hash_undefined))
1389 *type_change_ok = TRUE;
1391 /* It's OK to change the size if either the existing symbol or the
1392 new symbol is weak, or if the old symbol is undefined. */
1395 || h->root.type == bfd_link_hash_undefined)
1396 *size_change_ok = TRUE;
1398 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1399 symbol, respectively, appears to be a common symbol in a dynamic
1400 object. If a symbol appears in an uninitialized section, and is
1401 not weak, and is not a function, then it may be a common symbol
1402 which was resolved when the dynamic object was created. We want
1403 to treat such symbols specially, because they raise special
1404 considerations when setting the symbol size: if the symbol
1405 appears as a common symbol in a regular object, and the size in
1406 the regular object is larger, we must make sure that we use the
1407 larger size. This problematic case can always be avoided in C,
1408 but it must be handled correctly when using Fortran shared
1411 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1412 likewise for OLDDYNCOMMON and OLDDEF.
1414 Note that this test is just a heuristic, and that it is quite
1415 possible to have an uninitialized symbol in a shared object which
1416 is really a definition, rather than a common symbol. This could
1417 lead to some minor confusion when the symbol really is a common
1418 symbol in some regular object. However, I think it will be
1424 && (sec->flags & SEC_ALLOC) != 0
1425 && (sec->flags & SEC_LOAD) == 0
1428 newdyncommon = TRUE;
1430 newdyncommon = FALSE;
1434 && h->root.type == bfd_link_hash_defined
1436 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1437 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1440 olddyncommon = TRUE;
1442 olddyncommon = FALSE;
1444 /* We now know everything about the old and new symbols. We ask the
1445 backend to check if we can merge them. */
1446 if (bed->merge_symbol != NULL)
1448 if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
1453 /* If both the old and the new symbols look like common symbols in a
1454 dynamic object, set the size of the symbol to the larger of the
1459 && sym->st_size != h->size)
1461 /* Since we think we have two common symbols, issue a multiple
1462 common warning if desired. Note that we only warn if the
1463 size is different. If the size is the same, we simply let
1464 the old symbol override the new one as normally happens with
1465 symbols defined in dynamic objects. */
1467 if (! ((*info->callbacks->multiple_common)
1468 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1471 if (sym->st_size > h->size)
1472 h->size = sym->st_size;
1474 *size_change_ok = TRUE;
1477 /* If we are looking at a dynamic object, and we have found a
1478 definition, we need to see if the symbol was already defined by
1479 some other object. If so, we want to use the existing
1480 definition, and we do not want to report a multiple symbol
1481 definition error; we do this by clobbering *PSEC to be
1482 bfd_und_section_ptr.
1484 We treat a common symbol as a definition if the symbol in the
1485 shared library is a function, since common symbols always
1486 represent variables; this can cause confusion in principle, but
1487 any such confusion would seem to indicate an erroneous program or
1488 shared library. We also permit a common symbol in a regular
1489 object to override a weak symbol in a shared object. A common
1490 symbol in executable also overrides a symbol in a shared object. */
1495 || (h->root.type == bfd_link_hash_common
1498 || (!olddyn && bfd_link_executable (info))))))
1502 newdyncommon = FALSE;
1504 *psec = sec = bfd_und_section_ptr;
1505 *size_change_ok = TRUE;
1507 /* If we get here when the old symbol is a common symbol, then
1508 we are explicitly letting it override a weak symbol or
1509 function in a dynamic object, and we don't want to warn about
1510 a type change. If the old symbol is a defined symbol, a type
1511 change warning may still be appropriate. */
1513 if (h->root.type == bfd_link_hash_common)
1514 *type_change_ok = TRUE;
1517 /* Handle the special case of an old common symbol merging with a
1518 new symbol which looks like a common symbol in a shared object.
1519 We change *PSEC and *PVALUE to make the new symbol look like a
1520 common symbol, and let _bfd_generic_link_add_one_symbol do the
1524 && h->root.type == bfd_link_hash_common)
1528 newdyncommon = FALSE;
1529 *pvalue = sym->st_size;
1530 *psec = sec = bed->common_section (oldsec);
1531 *size_change_ok = TRUE;
1534 /* Skip weak definitions of symbols that are already defined. */
1535 if (newdef && olddef && newweak)
1537 /* Don't skip new non-IR weak syms. */
1538 if (!(oldbfd != NULL
1539 && (oldbfd->flags & BFD_PLUGIN) != 0
1540 && (abfd->flags & BFD_PLUGIN) == 0))
1546 /* Merge st_other. If the symbol already has a dynamic index,
1547 but visibility says it should not be visible, turn it into a
1549 elf_merge_st_other (abfd, h, sym, sec, newdef, newdyn);
1550 if (h->dynindx != -1)
1551 switch (ELF_ST_VISIBILITY (h->other))
1555 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1560 /* If the old symbol is from a dynamic object, and the new symbol is
1561 a definition which is not from a dynamic object, then the new
1562 symbol overrides the old symbol. Symbols from regular files
1563 always take precedence over symbols from dynamic objects, even if
1564 they are defined after the dynamic object in the link.
1566 As above, we again permit a common symbol in a regular object to
1567 override a definition in a shared object if the shared object
1568 symbol is a function or is weak. */
1573 || (bfd_is_com_section (sec)
1574 && (oldweak || oldfunc)))
1579 /* Change the hash table entry to undefined, and let
1580 _bfd_generic_link_add_one_symbol do the right thing with the
1583 h->root.type = bfd_link_hash_undefined;
1584 h->root.u.undef.abfd = h->root.u.def.section->owner;
1585 *size_change_ok = TRUE;
1588 olddyncommon = FALSE;
1590 /* We again permit a type change when a common symbol may be
1591 overriding a function. */
1593 if (bfd_is_com_section (sec))
1597 /* If a common symbol overrides a function, make sure
1598 that it isn't defined dynamically nor has type
1601 h->type = STT_NOTYPE;
1603 *type_change_ok = TRUE;
1606 if (hi->root.type == bfd_link_hash_indirect)
1609 /* This union may have been set to be non-NULL when this symbol
1610 was seen in a dynamic object. We must force the union to be
1611 NULL, so that it is correct for a regular symbol. */
1612 h->verinfo.vertree = NULL;
1615 /* Handle the special case of a new common symbol merging with an
1616 old symbol that looks like it might be a common symbol defined in
1617 a shared object. Note that we have already handled the case in
1618 which a new common symbol should simply override the definition
1619 in the shared library. */
1622 && bfd_is_com_section (sec)
1625 /* It would be best if we could set the hash table entry to a
1626 common symbol, but we don't know what to use for the section
1627 or the alignment. */
1628 if (! ((*info->callbacks->multiple_common)
1629 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1632 /* If the presumed common symbol in the dynamic object is
1633 larger, pretend that the new symbol has its size. */
1635 if (h->size > *pvalue)
1638 /* We need to remember the alignment required by the symbol
1639 in the dynamic object. */
1640 BFD_ASSERT (pold_alignment);
1641 *pold_alignment = h->root.u.def.section->alignment_power;
1644 olddyncommon = FALSE;
1646 h->root.type = bfd_link_hash_undefined;
1647 h->root.u.undef.abfd = h->root.u.def.section->owner;
1649 *size_change_ok = TRUE;
1650 *type_change_ok = TRUE;
1652 if (hi->root.type == bfd_link_hash_indirect)
1655 h->verinfo.vertree = NULL;
1660 /* Handle the case where we had a versioned symbol in a dynamic
1661 library and now find a definition in a normal object. In this
1662 case, we make the versioned symbol point to the normal one. */
1663 flip->root.type = h->root.type;
1664 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1665 h->root.type = bfd_link_hash_indirect;
1666 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1667 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1671 flip->ref_dynamic = 1;
1678 /* This function is called to create an indirect symbol from the
1679 default for the symbol with the default version if needed. The
1680 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1681 set DYNSYM if the new indirect symbol is dynamic. */
1684 _bfd_elf_add_default_symbol (bfd *abfd,
1685 struct bfd_link_info *info,
1686 struct elf_link_hash_entry *h,
1688 Elf_Internal_Sym *sym,
1692 bfd_boolean *dynsym)
1694 bfd_boolean type_change_ok;
1695 bfd_boolean size_change_ok;
1698 struct elf_link_hash_entry *hi;
1699 struct bfd_link_hash_entry *bh;
1700 const struct elf_backend_data *bed;
1701 bfd_boolean collect;
1702 bfd_boolean dynamic;
1703 bfd_boolean override;
1705 size_t len, shortlen;
1707 bfd_boolean matched;
1709 if (h->versioned == unversioned || h->versioned == versioned_hidden)
1712 /* If this symbol has a version, and it is the default version, we
1713 create an indirect symbol from the default name to the fully
1714 decorated name. This will cause external references which do not
1715 specify a version to be bound to this version of the symbol. */
1716 p = strchr (name, ELF_VER_CHR);
1717 if (h->versioned == unknown)
1721 h->versioned = unversioned;
1726 if (p[1] != ELF_VER_CHR)
1728 h->versioned = versioned_hidden;
1732 h->versioned = versioned;
1737 /* PR ld/19073: We may see an unversioned definition after the
1743 bed = get_elf_backend_data (abfd);
1744 collect = bed->collect;
1745 dynamic = (abfd->flags & DYNAMIC) != 0;
1747 shortlen = p - name;
1748 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1749 if (shortname == NULL)
1751 memcpy (shortname, name, shortlen);
1752 shortname[shortlen] = '\0';
1754 /* We are going to create a new symbol. Merge it with any existing
1755 symbol with this name. For the purposes of the merge, act as
1756 though we were defining the symbol we just defined, although we
1757 actually going to define an indirect symbol. */
1758 type_change_ok = FALSE;
1759 size_change_ok = FALSE;
1762 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1763 &hi, poldbfd, NULL, NULL, &skip, &override,
1764 &type_change_ok, &size_change_ok, &matched))
1772 /* Add the default symbol if not performing a relocatable link. */
1773 if (! bfd_link_relocatable (info))
1776 if (! (_bfd_generic_link_add_one_symbol
1777 (info, abfd, shortname, BSF_INDIRECT,
1778 bfd_ind_section_ptr,
1779 0, name, FALSE, collect, &bh)))
1781 hi = (struct elf_link_hash_entry *) bh;
1786 /* In this case the symbol named SHORTNAME is overriding the
1787 indirect symbol we want to add. We were planning on making
1788 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1789 is the name without a version. NAME is the fully versioned
1790 name, and it is the default version.
1792 Overriding means that we already saw a definition for the
1793 symbol SHORTNAME in a regular object, and it is overriding
1794 the symbol defined in the dynamic object.
1796 When this happens, we actually want to change NAME, the
1797 symbol we just added, to refer to SHORTNAME. This will cause
1798 references to NAME in the shared object to become references
1799 to SHORTNAME in the regular object. This is what we expect
1800 when we override a function in a shared object: that the
1801 references in the shared object will be mapped to the
1802 definition in the regular object. */
1804 while (hi->root.type == bfd_link_hash_indirect
1805 || hi->root.type == bfd_link_hash_warning)
1806 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1808 h->root.type = bfd_link_hash_indirect;
1809 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1813 hi->ref_dynamic = 1;
1817 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1822 /* Now set HI to H, so that the following code will set the
1823 other fields correctly. */
1827 /* Check if HI is a warning symbol. */
1828 if (hi->root.type == bfd_link_hash_warning)
1829 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1831 /* If there is a duplicate definition somewhere, then HI may not
1832 point to an indirect symbol. We will have reported an error to
1833 the user in that case. */
1835 if (hi->root.type == bfd_link_hash_indirect)
1837 struct elf_link_hash_entry *ht;
1839 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1840 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1842 /* A reference to the SHORTNAME symbol from a dynamic library
1843 will be satisfied by the versioned symbol at runtime. In
1844 effect, we have a reference to the versioned symbol. */
1845 ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1846 hi->dynamic_def |= ht->dynamic_def;
1848 /* See if the new flags lead us to realize that the symbol must
1854 if (! bfd_link_executable (info)
1861 if (hi->ref_regular)
1867 /* We also need to define an indirection from the nondefault version
1871 len = strlen (name);
1872 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1873 if (shortname == NULL)
1875 memcpy (shortname, name, shortlen);
1876 memcpy (shortname + shortlen, p + 1, len - shortlen);
1878 /* Once again, merge with any existing symbol. */
1879 type_change_ok = FALSE;
1880 size_change_ok = FALSE;
1882 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1883 &hi, poldbfd, NULL, NULL, &skip, &override,
1884 &type_change_ok, &size_change_ok, &matched))
1892 /* Here SHORTNAME is a versioned name, so we don't expect to see
1893 the type of override we do in the case above unless it is
1894 overridden by a versioned definition. */
1895 if (hi->root.type != bfd_link_hash_defined
1896 && hi->root.type != bfd_link_hash_defweak)
1897 (*_bfd_error_handler)
1898 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1904 if (! (_bfd_generic_link_add_one_symbol
1905 (info, abfd, shortname, BSF_INDIRECT,
1906 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1908 hi = (struct elf_link_hash_entry *) bh;
1910 /* If there is a duplicate definition somewhere, then HI may not
1911 point to an indirect symbol. We will have reported an error
1912 to the user in that case. */
1914 if (hi->root.type == bfd_link_hash_indirect)
1916 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1917 h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1918 hi->dynamic_def |= h->dynamic_def;
1920 /* See if the new flags lead us to realize that the symbol
1926 if (! bfd_link_executable (info)
1932 if (hi->ref_regular)
1942 /* This routine is used to export all defined symbols into the dynamic
1943 symbol table. It is called via elf_link_hash_traverse. */
1946 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1948 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1950 /* Ignore indirect symbols. These are added by the versioning code. */
1951 if (h->root.type == bfd_link_hash_indirect)
1954 /* Ignore this if we won't export it. */
1955 if (!eif->info->export_dynamic && !h->dynamic)
1958 if (h->dynindx == -1
1959 && (h->def_regular || h->ref_regular)
1960 && ! bfd_hide_sym_by_version (eif->info->version_info,
1961 h->root.root.string))
1963 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1973 /* Look through the symbols which are defined in other shared
1974 libraries and referenced here. Update the list of version
1975 dependencies. This will be put into the .gnu.version_r section.
1976 This function is called via elf_link_hash_traverse. */
1979 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1982 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1983 Elf_Internal_Verneed *t;
1984 Elf_Internal_Vernaux *a;
1987 /* We only care about symbols defined in shared objects with version
1992 || h->verinfo.verdef == NULL
1993 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
1994 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
1997 /* See if we already know about this version. */
1998 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
2002 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
2005 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
2006 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
2012 /* This is a new version. Add it to tree we are building. */
2017 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
2020 rinfo->failed = TRUE;
2024 t->vn_bfd = h->verinfo.verdef->vd_bfd;
2025 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
2026 elf_tdata (rinfo->info->output_bfd)->verref = t;
2030 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
2033 rinfo->failed = TRUE;
2037 /* Note that we are copying a string pointer here, and testing it
2038 above. If bfd_elf_string_from_elf_section is ever changed to
2039 discard the string data when low in memory, this will have to be
2041 a->vna_nodename = h->verinfo.verdef->vd_nodename;
2043 a->vna_flags = h->verinfo.verdef->vd_flags;
2044 a->vna_nextptr = t->vn_auxptr;
2046 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
2049 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
2056 /* Figure out appropriate versions for all the symbols. We may not
2057 have the version number script until we have read all of the input
2058 files, so until that point we don't know which symbols should be
2059 local. This function is called via elf_link_hash_traverse. */
2062 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
2064 struct elf_info_failed *sinfo;
2065 struct bfd_link_info *info;
2066 const struct elf_backend_data *bed;
2067 struct elf_info_failed eif;
2071 sinfo = (struct elf_info_failed *) data;
2074 /* Fix the symbol flags. */
2077 if (! _bfd_elf_fix_symbol_flags (h, &eif))
2080 sinfo->failed = TRUE;
2084 /* We only need version numbers for symbols defined in regular
2086 if (!h->def_regular)
2089 bed = get_elf_backend_data (info->output_bfd);
2090 p = strchr (h->root.root.string, ELF_VER_CHR);
2091 if (p != NULL && h->verinfo.vertree == NULL)
2093 struct bfd_elf_version_tree *t;
2096 if (*p == ELF_VER_CHR)
2099 /* If there is no version string, we can just return out. */
2103 /* Look for the version. If we find it, it is no longer weak. */
2104 for (t = sinfo->info->version_info; t != NULL; t = t->next)
2106 if (strcmp (t->name, p) == 0)
2110 struct bfd_elf_version_expr *d;
2112 len = p - h->root.root.string;
2113 alc = (char *) bfd_malloc (len);
2116 sinfo->failed = TRUE;
2119 memcpy (alc, h->root.root.string, len - 1);
2120 alc[len - 1] = '\0';
2121 if (alc[len - 2] == ELF_VER_CHR)
2122 alc[len - 2] = '\0';
2124 h->verinfo.vertree = t;
2128 if (t->globals.list != NULL)
2129 d = (*t->match) (&t->globals, NULL, alc);
2131 /* See if there is anything to force this symbol to
2133 if (d == NULL && t->locals.list != NULL)
2135 d = (*t->match) (&t->locals, NULL, alc);
2138 && ! info->export_dynamic)
2139 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2147 /* If we are building an application, we need to create a
2148 version node for this version. */
2149 if (t == NULL && bfd_link_executable (info))
2151 struct bfd_elf_version_tree **pp;
2154 /* If we aren't going to export this symbol, we don't need
2155 to worry about it. */
2156 if (h->dynindx == -1)
2160 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2163 sinfo->failed = TRUE;
2168 t->name_indx = (unsigned int) -1;
2172 /* Don't count anonymous version tag. */
2173 if (sinfo->info->version_info != NULL
2174 && sinfo->info->version_info->vernum == 0)
2176 for (pp = &sinfo->info->version_info;
2180 t->vernum = version_index;
2184 h->verinfo.vertree = t;
2188 /* We could not find the version for a symbol when
2189 generating a shared archive. Return an error. */
2190 (*_bfd_error_handler)
2191 (_("%B: version node not found for symbol %s"),
2192 info->output_bfd, h->root.root.string);
2193 bfd_set_error (bfd_error_bad_value);
2194 sinfo->failed = TRUE;
2199 /* If we don't have a version for this symbol, see if we can find
2201 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2206 = bfd_find_version_for_sym (sinfo->info->version_info,
2207 h->root.root.string, &hide);
2208 if (h->verinfo.vertree != NULL && hide)
2209 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2215 /* Read and swap the relocs from the section indicated by SHDR. This
2216 may be either a REL or a RELA section. The relocations are
2217 translated into RELA relocations and stored in INTERNAL_RELOCS,
2218 which should have already been allocated to contain enough space.
2219 The EXTERNAL_RELOCS are a buffer where the external form of the
2220 relocations should be stored.
2222 Returns FALSE if something goes wrong. */
2225 elf_link_read_relocs_from_section (bfd *abfd,
2227 Elf_Internal_Shdr *shdr,
2228 void *external_relocs,
2229 Elf_Internal_Rela *internal_relocs)
2231 const struct elf_backend_data *bed;
2232 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2233 const bfd_byte *erela;
2234 const bfd_byte *erelaend;
2235 Elf_Internal_Rela *irela;
2236 Elf_Internal_Shdr *symtab_hdr;
2239 /* Position ourselves at the start of the section. */
2240 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2243 /* Read the relocations. */
2244 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2247 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2248 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2250 bed = get_elf_backend_data (abfd);
2252 /* Convert the external relocations to the internal format. */
2253 if (shdr->sh_entsize == bed->s->sizeof_rel)
2254 swap_in = bed->s->swap_reloc_in;
2255 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2256 swap_in = bed->s->swap_reloca_in;
2259 bfd_set_error (bfd_error_wrong_format);
2263 erela = (const bfd_byte *) external_relocs;
2264 erelaend = erela + shdr->sh_size;
2265 irela = internal_relocs;
2266 while (erela < erelaend)
2270 (*swap_in) (abfd, erela, irela);
2271 r_symndx = ELF32_R_SYM (irela->r_info);
2272 if (bed->s->arch_size == 64)
2276 if ((size_t) r_symndx >= nsyms)
2278 (*_bfd_error_handler)
2279 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2280 " for offset 0x%lx in section `%A'"),
2282 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2283 bfd_set_error (bfd_error_bad_value);
2287 else if (r_symndx != STN_UNDEF)
2289 (*_bfd_error_handler)
2290 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2291 " when the object file has no symbol table"),
2293 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2294 bfd_set_error (bfd_error_bad_value);
2297 irela += bed->s->int_rels_per_ext_rel;
2298 erela += shdr->sh_entsize;
2304 /* Read and swap the relocs for a section O. They may have been
2305 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2306 not NULL, they are used as buffers to read into. They are known to
2307 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2308 the return value is allocated using either malloc or bfd_alloc,
2309 according to the KEEP_MEMORY argument. If O has two relocation
2310 sections (both REL and RELA relocations), then the REL_HDR
2311 relocations will appear first in INTERNAL_RELOCS, followed by the
2312 RELA_HDR relocations. */
2315 _bfd_elf_link_read_relocs (bfd *abfd,
2317 void *external_relocs,
2318 Elf_Internal_Rela *internal_relocs,
2319 bfd_boolean keep_memory)
2321 void *alloc1 = NULL;
2322 Elf_Internal_Rela *alloc2 = NULL;
2323 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2324 struct bfd_elf_section_data *esdo = elf_section_data (o);
2325 Elf_Internal_Rela *internal_rela_relocs;
2327 if (esdo->relocs != NULL)
2328 return esdo->relocs;
2330 if (o->reloc_count == 0)
2333 if (internal_relocs == NULL)
2337 size = o->reloc_count;
2338 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2340 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2342 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2343 if (internal_relocs == NULL)
2347 if (external_relocs == NULL)
2349 bfd_size_type size = 0;
2352 size += esdo->rel.hdr->sh_size;
2354 size += esdo->rela.hdr->sh_size;
2356 alloc1 = bfd_malloc (size);
2359 external_relocs = alloc1;
2362 internal_rela_relocs = internal_relocs;
2365 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2369 external_relocs = (((bfd_byte *) external_relocs)
2370 + esdo->rel.hdr->sh_size);
2371 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2372 * bed->s->int_rels_per_ext_rel);
2376 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2378 internal_rela_relocs)))
2381 /* Cache the results for next time, if we can. */
2383 esdo->relocs = internal_relocs;
2388 /* Don't free alloc2, since if it was allocated we are passing it
2389 back (under the name of internal_relocs). */
2391 return internal_relocs;
2399 bfd_release (abfd, alloc2);
2406 /* Compute the size of, and allocate space for, REL_HDR which is the
2407 section header for a section containing relocations for O. */
2410 _bfd_elf_link_size_reloc_section (bfd *abfd,
2411 struct bfd_elf_section_reloc_data *reldata)
2413 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2415 /* That allows us to calculate the size of the section. */
2416 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2418 /* The contents field must last into write_object_contents, so we
2419 allocate it with bfd_alloc rather than malloc. Also since we
2420 cannot be sure that the contents will actually be filled in,
2421 we zero the allocated space. */
2422 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2423 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2426 if (reldata->hashes == NULL && reldata->count)
2428 struct elf_link_hash_entry **p;
2430 p = ((struct elf_link_hash_entry **)
2431 bfd_zmalloc (reldata->count * sizeof (*p)));
2435 reldata->hashes = p;
2441 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2442 originated from the section given by INPUT_REL_HDR) to the
2446 _bfd_elf_link_output_relocs (bfd *output_bfd,
2447 asection *input_section,
2448 Elf_Internal_Shdr *input_rel_hdr,
2449 Elf_Internal_Rela *internal_relocs,
2450 struct elf_link_hash_entry **rel_hash
2453 Elf_Internal_Rela *irela;
2454 Elf_Internal_Rela *irelaend;
2456 struct bfd_elf_section_reloc_data *output_reldata;
2457 asection *output_section;
2458 const struct elf_backend_data *bed;
2459 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2460 struct bfd_elf_section_data *esdo;
2462 output_section = input_section->output_section;
2464 bed = get_elf_backend_data (output_bfd);
2465 esdo = elf_section_data (output_section);
2466 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2468 output_reldata = &esdo->rel;
2469 swap_out = bed->s->swap_reloc_out;
2471 else if (esdo->rela.hdr
2472 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2474 output_reldata = &esdo->rela;
2475 swap_out = bed->s->swap_reloca_out;
2479 (*_bfd_error_handler)
2480 (_("%B: relocation size mismatch in %B section %A"),
2481 output_bfd, input_section->owner, input_section);
2482 bfd_set_error (bfd_error_wrong_format);
2486 erel = output_reldata->hdr->contents;
2487 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2488 irela = internal_relocs;
2489 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2490 * bed->s->int_rels_per_ext_rel);
2491 while (irela < irelaend)
2493 (*swap_out) (output_bfd, irela, erel);
2494 irela += bed->s->int_rels_per_ext_rel;
2495 erel += input_rel_hdr->sh_entsize;
2498 /* Bump the counter, so that we know where to add the next set of
2500 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2505 /* Make weak undefined symbols in PIE dynamic. */
2508 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2509 struct elf_link_hash_entry *h)
2511 if (bfd_link_pie (info)
2513 && h->root.type == bfd_link_hash_undefweak)
2514 return bfd_elf_link_record_dynamic_symbol (info, h);
2519 /* Fix up the flags for a symbol. This handles various cases which
2520 can only be fixed after all the input files are seen. This is
2521 currently called by both adjust_dynamic_symbol and
2522 assign_sym_version, which is unnecessary but perhaps more robust in
2523 the face of future changes. */
2526 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2527 struct elf_info_failed *eif)
2529 const struct elf_backend_data *bed;
2531 /* If this symbol was mentioned in a non-ELF file, try to set
2532 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2533 permit a non-ELF file to correctly refer to a symbol defined in
2534 an ELF dynamic object. */
2537 while (h->root.type == bfd_link_hash_indirect)
2538 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2540 if (h->root.type != bfd_link_hash_defined
2541 && h->root.type != bfd_link_hash_defweak)
2544 h->ref_regular_nonweak = 1;
2548 if (h->root.u.def.section->owner != NULL
2549 && (bfd_get_flavour (h->root.u.def.section->owner)
2550 == bfd_target_elf_flavour))
2553 h->ref_regular_nonweak = 1;
2559 if (h->dynindx == -1
2563 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2572 /* Unfortunately, NON_ELF is only correct if the symbol
2573 was first seen in a non-ELF file. Fortunately, if the symbol
2574 was first seen in an ELF file, we're probably OK unless the
2575 symbol was defined in a non-ELF file. Catch that case here.
2576 FIXME: We're still in trouble if the symbol was first seen in
2577 a dynamic object, and then later in a non-ELF regular object. */
2578 if ((h->root.type == bfd_link_hash_defined
2579 || h->root.type == bfd_link_hash_defweak)
2581 && (h->root.u.def.section->owner != NULL
2582 ? (bfd_get_flavour (h->root.u.def.section->owner)
2583 != bfd_target_elf_flavour)
2584 : (bfd_is_abs_section (h->root.u.def.section)
2585 && !h->def_dynamic)))
2589 /* Backend specific symbol fixup. */
2590 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2591 if (bed->elf_backend_fixup_symbol
2592 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2595 /* If this is a final link, and the symbol was defined as a common
2596 symbol in a regular object file, and there was no definition in
2597 any dynamic object, then the linker will have allocated space for
2598 the symbol in a common section but the DEF_REGULAR
2599 flag will not have been set. */
2600 if (h->root.type == bfd_link_hash_defined
2604 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2607 /* If -Bsymbolic was used (which means to bind references to global
2608 symbols to the definition within the shared object), and this
2609 symbol was defined in a regular object, then it actually doesn't
2610 need a PLT entry. Likewise, if the symbol has non-default
2611 visibility. If the symbol has hidden or internal visibility, we
2612 will force it local. */
2614 && bfd_link_pic (eif->info)
2615 && is_elf_hash_table (eif->info->hash)
2616 && (SYMBOLIC_BIND (eif->info, h)
2617 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2620 bfd_boolean force_local;
2622 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2623 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2624 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2627 /* If a weak undefined symbol has non-default visibility, we also
2628 hide it from the dynamic linker. */
2629 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2630 && h->root.type == bfd_link_hash_undefweak)
2631 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2633 /* If this is a weak defined symbol in a dynamic object, and we know
2634 the real definition in the dynamic object, copy interesting flags
2635 over to the real definition. */
2636 if (h->u.weakdef != NULL)
2638 /* If the real definition is defined by a regular object file,
2639 don't do anything special. See the longer description in
2640 _bfd_elf_adjust_dynamic_symbol, below. */
2641 if (h->u.weakdef->def_regular)
2642 h->u.weakdef = NULL;
2645 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2647 while (h->root.type == bfd_link_hash_indirect)
2648 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2650 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2651 || h->root.type == bfd_link_hash_defweak);
2652 BFD_ASSERT (weakdef->def_dynamic);
2653 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2654 || weakdef->root.type == bfd_link_hash_defweak);
2655 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2662 /* Make the backend pick a good value for a dynamic symbol. This is
2663 called via elf_link_hash_traverse, and also calls itself
2667 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2669 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2671 const struct elf_backend_data *bed;
2673 if (! is_elf_hash_table (eif->info->hash))
2676 /* Ignore indirect symbols. These are added by the versioning code. */
2677 if (h->root.type == bfd_link_hash_indirect)
2680 /* Fix the symbol flags. */
2681 if (! _bfd_elf_fix_symbol_flags (h, eif))
2684 /* If this symbol does not require a PLT entry, and it is not
2685 defined by a dynamic object, or is not referenced by a regular
2686 object, ignore it. We do have to handle a weak defined symbol,
2687 even if no regular object refers to it, if we decided to add it
2688 to the dynamic symbol table. FIXME: Do we normally need to worry
2689 about symbols which are defined by one dynamic object and
2690 referenced by another one? */
2692 && h->type != STT_GNU_IFUNC
2696 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2698 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2702 /* If we've already adjusted this symbol, don't do it again. This
2703 can happen via a recursive call. */
2704 if (h->dynamic_adjusted)
2707 /* Don't look at this symbol again. Note that we must set this
2708 after checking the above conditions, because we may look at a
2709 symbol once, decide not to do anything, and then get called
2710 recursively later after REF_REGULAR is set below. */
2711 h->dynamic_adjusted = 1;
2713 /* If this is a weak definition, and we know a real definition, and
2714 the real symbol is not itself defined by a regular object file,
2715 then get a good value for the real definition. We handle the
2716 real symbol first, for the convenience of the backend routine.
2718 Note that there is a confusing case here. If the real definition
2719 is defined by a regular object file, we don't get the real symbol
2720 from the dynamic object, but we do get the weak symbol. If the
2721 processor backend uses a COPY reloc, then if some routine in the
2722 dynamic object changes the real symbol, we will not see that
2723 change in the corresponding weak symbol. This is the way other
2724 ELF linkers work as well, and seems to be a result of the shared
2727 I will clarify this issue. Most SVR4 shared libraries define the
2728 variable _timezone and define timezone as a weak synonym. The
2729 tzset call changes _timezone. If you write
2730 extern int timezone;
2732 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2733 you might expect that, since timezone is a synonym for _timezone,
2734 the same number will print both times. However, if the processor
2735 backend uses a COPY reloc, then actually timezone will be copied
2736 into your process image, and, since you define _timezone
2737 yourself, _timezone will not. Thus timezone and _timezone will
2738 wind up at different memory locations. The tzset call will set
2739 _timezone, leaving timezone unchanged. */
2741 if (h->u.weakdef != NULL)
2743 /* If we get to this point, there is an implicit reference to
2744 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2745 h->u.weakdef->ref_regular = 1;
2747 /* Ensure that the backend adjust_dynamic_symbol function sees
2748 H->U.WEAKDEF before H by recursively calling ourselves. */
2749 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2753 /* If a symbol has no type and no size and does not require a PLT
2754 entry, then we are probably about to do the wrong thing here: we
2755 are probably going to create a COPY reloc for an empty object.
2756 This case can arise when a shared object is built with assembly
2757 code, and the assembly code fails to set the symbol type. */
2759 && h->type == STT_NOTYPE
2761 (*_bfd_error_handler)
2762 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2763 h->root.root.string);
2765 dynobj = elf_hash_table (eif->info)->dynobj;
2766 bed = get_elf_backend_data (dynobj);
2768 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2777 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2781 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info,
2782 struct elf_link_hash_entry *h,
2785 unsigned int power_of_two;
2787 asection *sec = h->root.u.def.section;
2789 /* The section aligment of definition is the maximum alignment
2790 requirement of symbols defined in the section. Since we don't
2791 know the symbol alignment requirement, we start with the
2792 maximum alignment and check low bits of the symbol address
2793 for the minimum alignment. */
2794 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2795 mask = ((bfd_vma) 1 << power_of_two) - 1;
2796 while ((h->root.u.def.value & mask) != 0)
2802 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2805 /* Adjust the section alignment if needed. */
2806 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2811 /* We make sure that the symbol will be aligned properly. */
2812 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2814 /* Define the symbol as being at this point in DYNBSS. */
2815 h->root.u.def.section = dynbss;
2816 h->root.u.def.value = dynbss->size;
2818 /* Increment the size of DYNBSS to make room for the symbol. */
2819 dynbss->size += h->size;
2821 /* No error if extern_protected_data is true. */
2822 if (h->protected_def
2823 && (!info->extern_protected_data
2824 || (info->extern_protected_data < 0
2825 && !get_elf_backend_data (dynbss->owner)->extern_protected_data)))
2826 info->callbacks->einfo
2827 (_("%P: copy reloc against protected `%T' is dangerous\n"),
2828 h->root.root.string);
2833 /* Adjust all external symbols pointing into SEC_MERGE sections
2834 to reflect the object merging within the sections. */
2837 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2841 if ((h->root.type == bfd_link_hash_defined
2842 || h->root.type == bfd_link_hash_defweak)
2843 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2844 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2846 bfd *output_bfd = (bfd *) data;
2848 h->root.u.def.value =
2849 _bfd_merged_section_offset (output_bfd,
2850 &h->root.u.def.section,
2851 elf_section_data (sec)->sec_info,
2852 h->root.u.def.value);
2858 /* Returns false if the symbol referred to by H should be considered
2859 to resolve local to the current module, and true if it should be
2860 considered to bind dynamically. */
2863 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2864 struct bfd_link_info *info,
2865 bfd_boolean not_local_protected)
2867 bfd_boolean binding_stays_local_p;
2868 const struct elf_backend_data *bed;
2869 struct elf_link_hash_table *hash_table;
2874 while (h->root.type == bfd_link_hash_indirect
2875 || h->root.type == bfd_link_hash_warning)
2876 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2878 /* If it was forced local, then clearly it's not dynamic. */
2879 if (h->dynindx == -1)
2881 if (h->forced_local)
2884 /* Identify the cases where name binding rules say that a
2885 visible symbol resolves locally. */
2886 binding_stays_local_p = (bfd_link_executable (info)
2887 || SYMBOLIC_BIND (info, h));
2889 switch (ELF_ST_VISIBILITY (h->other))
2896 hash_table = elf_hash_table (info);
2897 if (!is_elf_hash_table (hash_table))
2900 bed = get_elf_backend_data (hash_table->dynobj);
2902 /* Proper resolution for function pointer equality may require
2903 that these symbols perhaps be resolved dynamically, even though
2904 we should be resolving them to the current module. */
2905 if (!not_local_protected || !bed->is_function_type (h->type))
2906 binding_stays_local_p = TRUE;
2913 /* If it isn't defined locally, then clearly it's dynamic. */
2914 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2917 /* Otherwise, the symbol is dynamic if binding rules don't tell
2918 us that it remains local. */
2919 return !binding_stays_local_p;
2922 /* Return true if the symbol referred to by H should be considered
2923 to resolve local to the current module, and false otherwise. Differs
2924 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2925 undefined symbols. The two functions are virtually identical except
2926 for the place where forced_local and dynindx == -1 are tested. If
2927 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2928 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2929 the symbol is local only for defined symbols.
2930 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2931 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2932 treatment of undefined weak symbols. For those that do not make
2933 undefined weak symbols dynamic, both functions may return false. */
2936 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2937 struct bfd_link_info *info,
2938 bfd_boolean local_protected)
2940 const struct elf_backend_data *bed;
2941 struct elf_link_hash_table *hash_table;
2943 /* If it's a local sym, of course we resolve locally. */
2947 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2948 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2949 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2952 /* Common symbols that become definitions don't get the DEF_REGULAR
2953 flag set, so test it first, and don't bail out. */
2954 if (ELF_COMMON_DEF_P (h))
2956 /* If we don't have a definition in a regular file, then we can't
2957 resolve locally. The sym is either undefined or dynamic. */
2958 else if (!h->def_regular)
2961 /* Forced local symbols resolve locally. */
2962 if (h->forced_local)
2965 /* As do non-dynamic symbols. */
2966 if (h->dynindx == -1)
2969 /* At this point, we know the symbol is defined and dynamic. In an
2970 executable it must resolve locally, likewise when building symbolic
2971 shared libraries. */
2972 if (bfd_link_executable (info) || SYMBOLIC_BIND (info, h))
2975 /* Now deal with defined dynamic symbols in shared libraries. Ones
2976 with default visibility might not resolve locally. */
2977 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2980 hash_table = elf_hash_table (info);
2981 if (!is_elf_hash_table (hash_table))
2984 bed = get_elf_backend_data (hash_table->dynobj);
2986 /* If extern_protected_data is false, STV_PROTECTED non-function
2987 symbols are local. */
2988 if ((!info->extern_protected_data
2989 || (info->extern_protected_data < 0
2990 && !bed->extern_protected_data))
2991 && !bed->is_function_type (h->type))
2994 /* Function pointer equality tests may require that STV_PROTECTED
2995 symbols be treated as dynamic symbols. If the address of a
2996 function not defined in an executable is set to that function's
2997 plt entry in the executable, then the address of the function in
2998 a shared library must also be the plt entry in the executable. */
2999 return local_protected;
3002 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3003 aligned. Returns the first TLS output section. */
3005 struct bfd_section *
3006 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
3008 struct bfd_section *sec, *tls;
3009 unsigned int align = 0;
3011 for (sec = obfd->sections; sec != NULL; sec = sec->next)
3012 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
3016 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
3017 if (sec->alignment_power > align)
3018 align = sec->alignment_power;
3020 elf_hash_table (info)->tls_sec = tls;
3022 /* Ensure the alignment of the first section is the largest alignment,
3023 so that the tls segment starts aligned. */
3025 tls->alignment_power = align;
3030 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3032 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
3033 Elf_Internal_Sym *sym)
3035 const struct elf_backend_data *bed;
3037 /* Local symbols do not count, but target specific ones might. */
3038 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
3039 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
3042 bed = get_elf_backend_data (abfd);
3043 /* Function symbols do not count. */
3044 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
3047 /* If the section is undefined, then so is the symbol. */
3048 if (sym->st_shndx == SHN_UNDEF)
3051 /* If the symbol is defined in the common section, then
3052 it is a common definition and so does not count. */
3053 if (bed->common_definition (sym))
3056 /* If the symbol is in a target specific section then we
3057 must rely upon the backend to tell us what it is. */
3058 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
3059 /* FIXME - this function is not coded yet:
3061 return _bfd_is_global_symbol_definition (abfd, sym);
3063 Instead for now assume that the definition is not global,
3064 Even if this is wrong, at least the linker will behave
3065 in the same way that it used to do. */
3071 /* Search the symbol table of the archive element of the archive ABFD
3072 whose archive map contains a mention of SYMDEF, and determine if
3073 the symbol is defined in this element. */
3075 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
3077 Elf_Internal_Shdr * hdr;
3078 bfd_size_type symcount;
3079 bfd_size_type extsymcount;
3080 bfd_size_type extsymoff;
3081 Elf_Internal_Sym *isymbuf;
3082 Elf_Internal_Sym *isym;
3083 Elf_Internal_Sym *isymend;
3086 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
3090 /* Return FALSE if the object has been claimed by plugin. */
3091 if (abfd->plugin_format == bfd_plugin_yes)
3094 if (! bfd_check_format (abfd, bfd_object))
3097 /* Select the appropriate symbol table. */
3098 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
3099 hdr = &elf_tdata (abfd)->symtab_hdr;
3101 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3103 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
3105 /* The sh_info field of the symtab header tells us where the
3106 external symbols start. We don't care about the local symbols. */
3107 if (elf_bad_symtab (abfd))
3109 extsymcount = symcount;
3114 extsymcount = symcount - hdr->sh_info;
3115 extsymoff = hdr->sh_info;
3118 if (extsymcount == 0)
3121 /* Read in the symbol table. */
3122 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3124 if (isymbuf == NULL)
3127 /* Scan the symbol table looking for SYMDEF. */
3129 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
3133 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3138 if (strcmp (name, symdef->name) == 0)
3140 result = is_global_data_symbol_definition (abfd, isym);
3150 /* Add an entry to the .dynamic table. */
3153 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3157 struct elf_link_hash_table *hash_table;
3158 const struct elf_backend_data *bed;
3160 bfd_size_type newsize;
3161 bfd_byte *newcontents;
3162 Elf_Internal_Dyn dyn;
3164 hash_table = elf_hash_table (info);
3165 if (! is_elf_hash_table (hash_table))
3168 bed = get_elf_backend_data (hash_table->dynobj);
3169 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3170 BFD_ASSERT (s != NULL);
3172 newsize = s->size + bed->s->sizeof_dyn;
3173 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3174 if (newcontents == NULL)
3178 dyn.d_un.d_val = val;
3179 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3182 s->contents = newcontents;
3187 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3188 otherwise just check whether one already exists. Returns -1 on error,
3189 1 if a DT_NEEDED tag already exists, and 0 on success. */
3192 elf_add_dt_needed_tag (bfd *abfd,
3193 struct bfd_link_info *info,
3197 struct elf_link_hash_table *hash_table;
3198 bfd_size_type strindex;
3200 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3203 hash_table = elf_hash_table (info);
3204 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3205 if (strindex == (bfd_size_type) -1)
3208 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3211 const struct elf_backend_data *bed;
3214 bed = get_elf_backend_data (hash_table->dynobj);
3215 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3217 for (extdyn = sdyn->contents;
3218 extdyn < sdyn->contents + sdyn->size;
3219 extdyn += bed->s->sizeof_dyn)
3221 Elf_Internal_Dyn dyn;
3223 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3224 if (dyn.d_tag == DT_NEEDED
3225 && dyn.d_un.d_val == strindex)
3227 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3235 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3238 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3242 /* We were just checking for existence of the tag. */
3243 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3248 /* Return true if SONAME is on the needed list between NEEDED and STOP
3249 (or the end of list if STOP is NULL), and needed by a library that
3253 on_needed_list (const char *soname,
3254 struct bfd_link_needed_list *needed,
3255 struct bfd_link_needed_list *stop)
3257 struct bfd_link_needed_list *look;
3258 for (look = needed; look != stop; look = look->next)
3259 if (strcmp (soname, look->name) == 0
3260 && ((elf_dyn_lib_class (look->by) & DYN_AS_NEEDED) == 0
3261 /* If needed by a library that itself is not directly
3262 needed, recursively check whether that library is
3263 indirectly needed. Since we add DT_NEEDED entries to
3264 the end of the list, library dependencies appear after
3265 the library. Therefore search prior to the current
3266 LOOK, preventing possible infinite recursion. */
3267 || on_needed_list (elf_dt_name (look->by), needed, look)))
3273 /* Sort symbol by value, section, and size. */
3275 elf_sort_symbol (const void *arg1, const void *arg2)
3277 const struct elf_link_hash_entry *h1;
3278 const struct elf_link_hash_entry *h2;
3279 bfd_signed_vma vdiff;
3281 h1 = *(const struct elf_link_hash_entry **) arg1;
3282 h2 = *(const struct elf_link_hash_entry **) arg2;
3283 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3285 return vdiff > 0 ? 1 : -1;
3288 int sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3290 return sdiff > 0 ? 1 : -1;
3292 vdiff = h1->size - h2->size;
3293 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3296 /* This function is used to adjust offsets into .dynstr for
3297 dynamic symbols. This is called via elf_link_hash_traverse. */
3300 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3302 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3304 if (h->dynindx != -1)
3305 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3309 /* Assign string offsets in .dynstr, update all structures referencing
3313 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3315 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3316 struct elf_link_local_dynamic_entry *entry;
3317 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3318 bfd *dynobj = hash_table->dynobj;
3321 const struct elf_backend_data *bed;
3324 _bfd_elf_strtab_finalize (dynstr);
3325 size = _bfd_elf_strtab_size (dynstr);
3327 bed = get_elf_backend_data (dynobj);
3328 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3329 BFD_ASSERT (sdyn != NULL);
3331 /* Update all .dynamic entries referencing .dynstr strings. */
3332 for (extdyn = sdyn->contents;
3333 extdyn < sdyn->contents + sdyn->size;
3334 extdyn += bed->s->sizeof_dyn)
3336 Elf_Internal_Dyn dyn;
3338 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3342 dyn.d_un.d_val = size;
3352 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3357 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3360 /* Now update local dynamic symbols. */
3361 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3362 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3363 entry->isym.st_name);
3365 /* And the rest of dynamic symbols. */
3366 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3368 /* Adjust version definitions. */
3369 if (elf_tdata (output_bfd)->cverdefs)
3374 Elf_Internal_Verdef def;
3375 Elf_Internal_Verdaux defaux;
3377 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3381 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3383 p += sizeof (Elf_External_Verdef);
3384 if (def.vd_aux != sizeof (Elf_External_Verdef))
3386 for (i = 0; i < def.vd_cnt; ++i)
3388 _bfd_elf_swap_verdaux_in (output_bfd,
3389 (Elf_External_Verdaux *) p, &defaux);
3390 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3392 _bfd_elf_swap_verdaux_out (output_bfd,
3393 &defaux, (Elf_External_Verdaux *) p);
3394 p += sizeof (Elf_External_Verdaux);
3397 while (def.vd_next);
3400 /* Adjust version references. */
3401 if (elf_tdata (output_bfd)->verref)
3406 Elf_Internal_Verneed need;
3407 Elf_Internal_Vernaux needaux;
3409 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3413 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3415 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3416 _bfd_elf_swap_verneed_out (output_bfd, &need,
3417 (Elf_External_Verneed *) p);
3418 p += sizeof (Elf_External_Verneed);
3419 for (i = 0; i < need.vn_cnt; ++i)
3421 _bfd_elf_swap_vernaux_in (output_bfd,
3422 (Elf_External_Vernaux *) p, &needaux);
3423 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3425 _bfd_elf_swap_vernaux_out (output_bfd,
3427 (Elf_External_Vernaux *) p);
3428 p += sizeof (Elf_External_Vernaux);
3431 while (need.vn_next);
3437 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3438 The default is to only match when the INPUT and OUTPUT are exactly
3442 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3443 const bfd_target *output)
3445 return input == output;
3448 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3449 This version is used when different targets for the same architecture
3450 are virtually identical. */
3453 _bfd_elf_relocs_compatible (const bfd_target *input,
3454 const bfd_target *output)
3456 const struct elf_backend_data *obed, *ibed;
3458 if (input == output)
3461 ibed = xvec_get_elf_backend_data (input);
3462 obed = xvec_get_elf_backend_data (output);
3464 if (ibed->arch != obed->arch)
3467 /* If both backends are using this function, deem them compatible. */
3468 return ibed->relocs_compatible == obed->relocs_compatible;
3471 /* Make a special call to the linker "notice" function to tell it that
3472 we are about to handle an as-needed lib, or have finished
3473 processing the lib. */
3476 _bfd_elf_notice_as_needed (bfd *ibfd,
3477 struct bfd_link_info *info,
3478 enum notice_asneeded_action act)
3480 return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
3483 /* Check relocations an ELF object file. */
3486 _bfd_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info)
3488 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3489 struct elf_link_hash_table *htab = elf_hash_table (info);
3491 /* If this object is the same format as the output object, and it is
3492 not a shared library, then let the backend look through the
3495 This is required to build global offset table entries and to
3496 arrange for dynamic relocs. It is not required for the
3497 particular common case of linking non PIC code, even when linking
3498 against shared libraries, but unfortunately there is no way of
3499 knowing whether an object file has been compiled PIC or not.
3500 Looking through the relocs is not particularly time consuming.
3501 The problem is that we must either (1) keep the relocs in memory,
3502 which causes the linker to require additional runtime memory or
3503 (2) read the relocs twice from the input file, which wastes time.
3504 This would be a good case for using mmap.
3506 I have no idea how to handle linking PIC code into a file of a
3507 different format. It probably can't be done. */
3508 if ((abfd->flags & DYNAMIC) == 0
3509 && is_elf_hash_table (htab)
3510 && bed->check_relocs != NULL
3511 && elf_object_id (abfd) == elf_hash_table_id (htab)
3512 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
3516 for (o = abfd->sections; o != NULL; o = o->next)
3518 Elf_Internal_Rela *internal_relocs;
3521 if ((o->flags & SEC_RELOC) == 0
3522 || o->reloc_count == 0
3523 || ((info->strip == strip_all || info->strip == strip_debugger)
3524 && (o->flags & SEC_DEBUGGING) != 0)
3525 || bfd_is_abs_section (o->output_section))
3528 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
3530 if (internal_relocs == NULL)
3533 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
3535 if (elf_section_data (o)->relocs != internal_relocs)
3536 free (internal_relocs);
3546 /* Add symbols from an ELF object file to the linker hash table. */
3549 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3551 Elf_Internal_Ehdr *ehdr;
3552 Elf_Internal_Shdr *hdr;
3553 bfd_size_type symcount;
3554 bfd_size_type extsymcount;
3555 bfd_size_type extsymoff;
3556 struct elf_link_hash_entry **sym_hash;
3557 bfd_boolean dynamic;
3558 Elf_External_Versym *extversym = NULL;
3559 Elf_External_Versym *ever;
3560 struct elf_link_hash_entry *weaks;
3561 struct elf_link_hash_entry **nondeflt_vers = NULL;
3562 bfd_size_type nondeflt_vers_cnt = 0;
3563 Elf_Internal_Sym *isymbuf = NULL;
3564 Elf_Internal_Sym *isym;
3565 Elf_Internal_Sym *isymend;
3566 const struct elf_backend_data *bed;
3567 bfd_boolean add_needed;
3568 struct elf_link_hash_table *htab;
3570 void *alloc_mark = NULL;
3571 struct bfd_hash_entry **old_table = NULL;
3572 unsigned int old_size = 0;
3573 unsigned int old_count = 0;
3574 void *old_tab = NULL;
3576 struct bfd_link_hash_entry *old_undefs = NULL;
3577 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3578 long old_dynsymcount = 0;
3579 bfd_size_type old_dynstr_size = 0;
3582 bfd_boolean just_syms;
3584 htab = elf_hash_table (info);
3585 bed = get_elf_backend_data (abfd);
3587 if ((abfd->flags & DYNAMIC) == 0)
3593 /* You can't use -r against a dynamic object. Also, there's no
3594 hope of using a dynamic object which does not exactly match
3595 the format of the output file. */
3596 if (bfd_link_relocatable (info)
3597 || !is_elf_hash_table (htab)
3598 || info->output_bfd->xvec != abfd->xvec)
3600 if (bfd_link_relocatable (info))
3601 bfd_set_error (bfd_error_invalid_operation);
3603 bfd_set_error (bfd_error_wrong_format);
3608 ehdr = elf_elfheader (abfd);
3609 if (info->warn_alternate_em
3610 && bed->elf_machine_code != ehdr->e_machine
3611 && ((bed->elf_machine_alt1 != 0
3612 && ehdr->e_machine == bed->elf_machine_alt1)
3613 || (bed->elf_machine_alt2 != 0
3614 && ehdr->e_machine == bed->elf_machine_alt2)))
3615 info->callbacks->einfo
3616 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3617 ehdr->e_machine, abfd, bed->elf_machine_code);
3619 /* As a GNU extension, any input sections which are named
3620 .gnu.warning.SYMBOL are treated as warning symbols for the given
3621 symbol. This differs from .gnu.warning sections, which generate
3622 warnings when they are included in an output file. */
3623 /* PR 12761: Also generate this warning when building shared libraries. */
3624 for (s = abfd->sections; s != NULL; s = s->next)
3628 name = bfd_get_section_name (abfd, s);
3629 if (CONST_STRNEQ (name, ".gnu.warning."))
3634 name += sizeof ".gnu.warning." - 1;
3636 /* If this is a shared object, then look up the symbol
3637 in the hash table. If it is there, and it is already
3638 been defined, then we will not be using the entry
3639 from this shared object, so we don't need to warn.
3640 FIXME: If we see the definition in a regular object
3641 later on, we will warn, but we shouldn't. The only
3642 fix is to keep track of what warnings we are supposed
3643 to emit, and then handle them all at the end of the
3647 struct elf_link_hash_entry *h;
3649 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3651 /* FIXME: What about bfd_link_hash_common? */
3653 && (h->root.type == bfd_link_hash_defined
3654 || h->root.type == bfd_link_hash_defweak))
3659 msg = (char *) bfd_alloc (abfd, sz + 1);
3663 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3668 if (! (_bfd_generic_link_add_one_symbol
3669 (info, abfd, name, BSF_WARNING, s, 0, msg,
3670 FALSE, bed->collect, NULL)))
3673 if (bfd_link_executable (info))
3675 /* Clobber the section size so that the warning does
3676 not get copied into the output file. */
3679 /* Also set SEC_EXCLUDE, so that symbols defined in
3680 the warning section don't get copied to the output. */
3681 s->flags |= SEC_EXCLUDE;
3686 just_syms = ((s = abfd->sections) != NULL
3687 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);
3692 /* If we are creating a shared library, create all the dynamic
3693 sections immediately. We need to attach them to something,
3694 so we attach them to this BFD, provided it is the right
3695 format and is not from ld --just-symbols. Always create the
3696 dynamic sections for -E/--dynamic-list. FIXME: If there
3697 are no input BFD's of the same format as the output, we can't
3698 make a shared library. */
3700 && (bfd_link_pic (info)
3701 || (!bfd_link_relocatable (info)
3702 && (info->export_dynamic || info->dynamic)))
3703 && is_elf_hash_table (htab)
3704 && info->output_bfd->xvec == abfd->xvec
3705 && !htab->dynamic_sections_created)
3707 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3711 else if (!is_elf_hash_table (htab))
3715 const char *soname = NULL;
3717 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3720 /* ld --just-symbols and dynamic objects don't mix very well.
3721 ld shouldn't allow it. */
3725 /* If this dynamic lib was specified on the command line with
3726 --as-needed in effect, then we don't want to add a DT_NEEDED
3727 tag unless the lib is actually used. Similary for libs brought
3728 in by another lib's DT_NEEDED. When --no-add-needed is used
3729 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3730 any dynamic library in DT_NEEDED tags in the dynamic lib at
3732 add_needed = (elf_dyn_lib_class (abfd)
3733 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3734 | DYN_NO_NEEDED)) == 0;
3736 s = bfd_get_section_by_name (abfd, ".dynamic");
3741 unsigned int elfsec;
3742 unsigned long shlink;
3744 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3751 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3752 if (elfsec == SHN_BAD)
3753 goto error_free_dyn;
3754 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3756 for (extdyn = dynbuf;
3757 extdyn < dynbuf + s->size;
3758 extdyn += bed->s->sizeof_dyn)
3760 Elf_Internal_Dyn dyn;
3762 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3763 if (dyn.d_tag == DT_SONAME)
3765 unsigned int tagv = dyn.d_un.d_val;
3766 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3768 goto error_free_dyn;
3770 if (dyn.d_tag == DT_NEEDED)
3772 struct bfd_link_needed_list *n, **pn;
3774 unsigned int tagv = dyn.d_un.d_val;
3776 amt = sizeof (struct bfd_link_needed_list);
3777 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3778 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3779 if (n == NULL || fnm == NULL)
3780 goto error_free_dyn;
3781 amt = strlen (fnm) + 1;
3782 anm = (char *) bfd_alloc (abfd, amt);
3784 goto error_free_dyn;
3785 memcpy (anm, fnm, amt);
3789 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3793 if (dyn.d_tag == DT_RUNPATH)
3795 struct bfd_link_needed_list *n, **pn;
3797 unsigned int tagv = dyn.d_un.d_val;
3799 amt = sizeof (struct bfd_link_needed_list);
3800 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3801 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3802 if (n == NULL || fnm == NULL)
3803 goto error_free_dyn;
3804 amt = strlen (fnm) + 1;
3805 anm = (char *) bfd_alloc (abfd, amt);
3807 goto error_free_dyn;
3808 memcpy (anm, fnm, amt);
3812 for (pn = & runpath;
3818 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3819 if (!runpath && dyn.d_tag == DT_RPATH)
3821 struct bfd_link_needed_list *n, **pn;
3823 unsigned int tagv = dyn.d_un.d_val;
3825 amt = sizeof (struct bfd_link_needed_list);
3826 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3827 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3828 if (n == NULL || fnm == NULL)
3829 goto error_free_dyn;
3830 amt = strlen (fnm) + 1;
3831 anm = (char *) bfd_alloc (abfd, amt);
3833 goto error_free_dyn;
3834 memcpy (anm, fnm, amt);
3844 if (dyn.d_tag == DT_AUDIT)
3846 unsigned int tagv = dyn.d_un.d_val;
3847 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3854 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3855 frees all more recently bfd_alloc'd blocks as well. */
3861 struct bfd_link_needed_list **pn;
3862 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3867 /* We do not want to include any of the sections in a dynamic
3868 object in the output file. We hack by simply clobbering the
3869 list of sections in the BFD. This could be handled more
3870 cleanly by, say, a new section flag; the existing
3871 SEC_NEVER_LOAD flag is not the one we want, because that one
3872 still implies that the section takes up space in the output
3874 bfd_section_list_clear (abfd);
3876 /* Find the name to use in a DT_NEEDED entry that refers to this
3877 object. If the object has a DT_SONAME entry, we use it.
3878 Otherwise, if the generic linker stuck something in
3879 elf_dt_name, we use that. Otherwise, we just use the file
3881 if (soname == NULL || *soname == '\0')
3883 soname = elf_dt_name (abfd);
3884 if (soname == NULL || *soname == '\0')
3885 soname = bfd_get_filename (abfd);
3888 /* Save the SONAME because sometimes the linker emulation code
3889 will need to know it. */
3890 elf_dt_name (abfd) = soname;
3892 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3896 /* If we have already included this dynamic object in the
3897 link, just ignore it. There is no reason to include a
3898 particular dynamic object more than once. */
3902 /* Save the DT_AUDIT entry for the linker emulation code. */
3903 elf_dt_audit (abfd) = audit;
3906 /* If this is a dynamic object, we always link against the .dynsym
3907 symbol table, not the .symtab symbol table. The dynamic linker
3908 will only see the .dynsym symbol table, so there is no reason to
3909 look at .symtab for a dynamic object. */
3911 if (! dynamic || elf_dynsymtab (abfd) == 0)
3912 hdr = &elf_tdata (abfd)->symtab_hdr;
3914 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3916 symcount = hdr->sh_size / bed->s->sizeof_sym;
3918 /* The sh_info field of the symtab header tells us where the
3919 external symbols start. We don't care about the local symbols at
3921 if (elf_bad_symtab (abfd))
3923 extsymcount = symcount;
3928 extsymcount = symcount - hdr->sh_info;
3929 extsymoff = hdr->sh_info;
3932 sym_hash = elf_sym_hashes (abfd);
3933 if (extsymcount != 0)
3935 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3937 if (isymbuf == NULL)
3940 if (sym_hash == NULL)
3942 /* We store a pointer to the hash table entry for each
3944 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3945 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
3946 if (sym_hash == NULL)
3947 goto error_free_sym;
3948 elf_sym_hashes (abfd) = sym_hash;
3954 /* Read in any version definitions. */
3955 if (!_bfd_elf_slurp_version_tables (abfd,
3956 info->default_imported_symver))
3957 goto error_free_sym;
3959 /* Read in the symbol versions, but don't bother to convert them
3960 to internal format. */
3961 if (elf_dynversym (abfd) != 0)
3963 Elf_Internal_Shdr *versymhdr;
3965 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3966 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3967 if (extversym == NULL)
3968 goto error_free_sym;
3969 amt = versymhdr->sh_size;
3970 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3971 || bfd_bread (extversym, amt, abfd) != amt)
3972 goto error_free_vers;
3976 /* If we are loading an as-needed shared lib, save the symbol table
3977 state before we start adding symbols. If the lib turns out
3978 to be unneeded, restore the state. */
3979 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3984 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3986 struct bfd_hash_entry *p;
3987 struct elf_link_hash_entry *h;
3989 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3991 h = (struct elf_link_hash_entry *) p;
3992 entsize += htab->root.table.entsize;
3993 if (h->root.type == bfd_link_hash_warning)
3994 entsize += htab->root.table.entsize;
3998 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3999 old_tab = bfd_malloc (tabsize + entsize);
4000 if (old_tab == NULL)
4001 goto error_free_vers;
4003 /* Remember the current objalloc pointer, so that all mem for
4004 symbols added can later be reclaimed. */
4005 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
4006 if (alloc_mark == NULL)
4007 goto error_free_vers;
4009 /* Make a special call to the linker "notice" function to
4010 tell it that we are about to handle an as-needed lib. */
4011 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
4012 goto error_free_vers;
4014 /* Clone the symbol table. Remember some pointers into the
4015 symbol table, and dynamic symbol count. */
4016 old_ent = (char *) old_tab + tabsize;
4017 memcpy (old_tab, htab->root.table.table, tabsize);
4018 old_undefs = htab->root.undefs;
4019 old_undefs_tail = htab->root.undefs_tail;
4020 old_table = htab->root.table.table;
4021 old_size = htab->root.table.size;
4022 old_count = htab->root.table.count;
4023 old_dynsymcount = htab->dynsymcount;
4024 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
4026 for (i = 0; i < htab->root.table.size; i++)
4028 struct bfd_hash_entry *p;
4029 struct elf_link_hash_entry *h;
4031 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4033 memcpy (old_ent, p, htab->root.table.entsize);
4034 old_ent = (char *) old_ent + htab->root.table.entsize;
4035 h = (struct elf_link_hash_entry *) p;
4036 if (h->root.type == bfd_link_hash_warning)
4038 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
4039 old_ent = (char *) old_ent + htab->root.table.entsize;
4046 ever = extversym != NULL ? extversym + extsymoff : NULL;
4047 for (isym = isymbuf, isymend = isymbuf + extsymcount;
4049 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
4053 asection *sec, *new_sec;
4056 struct elf_link_hash_entry *h;
4057 struct elf_link_hash_entry *hi;
4058 bfd_boolean definition;
4059 bfd_boolean size_change_ok;
4060 bfd_boolean type_change_ok;
4061 bfd_boolean new_weakdef;
4062 bfd_boolean new_weak;
4063 bfd_boolean old_weak;
4064 bfd_boolean override;
4066 unsigned int old_alignment;
4068 bfd_boolean matched;
4072 flags = BSF_NO_FLAGS;
4074 value = isym->st_value;
4075 common = bed->common_definition (isym);
4077 bind = ELF_ST_BIND (isym->st_info);
4081 /* This should be impossible, since ELF requires that all
4082 global symbols follow all local symbols, and that sh_info
4083 point to the first global symbol. Unfortunately, Irix 5
4088 if (isym->st_shndx != SHN_UNDEF && !common)
4096 case STB_GNU_UNIQUE:
4097 flags = BSF_GNU_UNIQUE;
4101 /* Leave it up to the processor backend. */
4105 if (isym->st_shndx == SHN_UNDEF)
4106 sec = bfd_und_section_ptr;
4107 else if (isym->st_shndx == SHN_ABS)
4108 sec = bfd_abs_section_ptr;
4109 else if (isym->st_shndx == SHN_COMMON)
4111 sec = bfd_com_section_ptr;
4112 /* What ELF calls the size we call the value. What ELF
4113 calls the value we call the alignment. */
4114 value = isym->st_size;
4118 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
4120 sec = bfd_abs_section_ptr;
4121 else if (discarded_section (sec))
4123 /* Symbols from discarded section are undefined. We keep
4125 sec = bfd_und_section_ptr;
4126 isym->st_shndx = SHN_UNDEF;
4128 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
4132 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
4135 goto error_free_vers;
4137 if (isym->st_shndx == SHN_COMMON
4138 && (abfd->flags & BFD_PLUGIN) != 0)
4140 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
4144 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
4146 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
4148 goto error_free_vers;
4152 else if (isym->st_shndx == SHN_COMMON
4153 && ELF_ST_TYPE (isym->st_info) == STT_TLS
4154 && !bfd_link_relocatable (info))
4156 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
4160 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
4161 | SEC_LINKER_CREATED);
4162 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
4164 goto error_free_vers;
4168 else if (bed->elf_add_symbol_hook)
4170 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
4172 goto error_free_vers;
4174 /* The hook function sets the name to NULL if this symbol
4175 should be skipped for some reason. */
4180 /* Sanity check that all possibilities were handled. */
4183 bfd_set_error (bfd_error_bad_value);
4184 goto error_free_vers;
4187 /* Silently discard TLS symbols from --just-syms. There's
4188 no way to combine a static TLS block with a new TLS block
4189 for this executable. */
4190 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
4191 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
4194 if (bfd_is_und_section (sec)
4195 || bfd_is_com_section (sec))
4200 size_change_ok = FALSE;
4201 type_change_ok = bed->type_change_ok;
4208 if (is_elf_hash_table (htab))
4210 Elf_Internal_Versym iver;
4211 unsigned int vernum = 0;
4216 if (info->default_imported_symver)
4217 /* Use the default symbol version created earlier. */
4218 iver.vs_vers = elf_tdata (abfd)->cverdefs;
4223 _bfd_elf_swap_versym_in (abfd, ever, &iver);
4225 vernum = iver.vs_vers & VERSYM_VERSION;
4227 /* If this is a hidden symbol, or if it is not version
4228 1, we append the version name to the symbol name.
4229 However, we do not modify a non-hidden absolute symbol
4230 if it is not a function, because it might be the version
4231 symbol itself. FIXME: What if it isn't? */
4232 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4234 && (!bfd_is_abs_section (sec)
4235 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4238 size_t namelen, verlen, newlen;
4241 if (isym->st_shndx != SHN_UNDEF)
4243 if (vernum > elf_tdata (abfd)->cverdefs)
4245 else if (vernum > 1)
4247 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4253 (*_bfd_error_handler)
4254 (_("%B: %s: invalid version %u (max %d)"),
4256 elf_tdata (abfd)->cverdefs);
4257 bfd_set_error (bfd_error_bad_value);
4258 goto error_free_vers;
4263 /* We cannot simply test for the number of
4264 entries in the VERNEED section since the
4265 numbers for the needed versions do not start
4267 Elf_Internal_Verneed *t;
4270 for (t = elf_tdata (abfd)->verref;
4274 Elf_Internal_Vernaux *a;
4276 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4278 if (a->vna_other == vernum)
4280 verstr = a->vna_nodename;
4289 (*_bfd_error_handler)
4290 (_("%B: %s: invalid needed version %d"),
4291 abfd, name, vernum);
4292 bfd_set_error (bfd_error_bad_value);
4293 goto error_free_vers;
4297 namelen = strlen (name);
4298 verlen = strlen (verstr);
4299 newlen = namelen + verlen + 2;
4300 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4301 && isym->st_shndx != SHN_UNDEF)
4304 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4305 if (newname == NULL)
4306 goto error_free_vers;
4307 memcpy (newname, name, namelen);
4308 p = newname + namelen;
4310 /* If this is a defined non-hidden version symbol,
4311 we add another @ to the name. This indicates the
4312 default version of the symbol. */
4313 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4314 && isym->st_shndx != SHN_UNDEF)
4316 memcpy (p, verstr, verlen + 1);
4321 /* If this symbol has default visibility and the user has
4322 requested we not re-export it, then mark it as hidden. */
4323 if (!bfd_is_und_section (sec)
4326 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4327 isym->st_other = (STV_HIDDEN
4328 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4330 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4331 sym_hash, &old_bfd, &old_weak,
4332 &old_alignment, &skip, &override,
4333 &type_change_ok, &size_change_ok,
4335 goto error_free_vers;
4340 /* Override a definition only if the new symbol matches the
4342 if (override && matched)
4346 while (h->root.type == bfd_link_hash_indirect
4347 || h->root.type == bfd_link_hash_warning)
4348 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4350 if (elf_tdata (abfd)->verdef != NULL
4353 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4356 if (! (_bfd_generic_link_add_one_symbol
4357 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4358 (struct bfd_link_hash_entry **) sym_hash)))
4359 goto error_free_vers;
4362 /* We need to make sure that indirect symbol dynamic flags are
4365 while (h->root.type == bfd_link_hash_indirect
4366 || h->root.type == bfd_link_hash_warning)
4367 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4371 new_weak = (flags & BSF_WEAK) != 0;
4372 new_weakdef = FALSE;
4376 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4377 && is_elf_hash_table (htab)
4378 && h->u.weakdef == NULL)
4380 /* Keep a list of all weak defined non function symbols from
4381 a dynamic object, using the weakdef field. Later in this
4382 function we will set the weakdef field to the correct
4383 value. We only put non-function symbols from dynamic
4384 objects on this list, because that happens to be the only
4385 time we need to know the normal symbol corresponding to a
4386 weak symbol, and the information is time consuming to
4387 figure out. If the weakdef field is not already NULL,
4388 then this symbol was already defined by some previous
4389 dynamic object, and we will be using that previous
4390 definition anyhow. */
4392 h->u.weakdef = weaks;
4397 /* Set the alignment of a common symbol. */
4398 if ((common || bfd_is_com_section (sec))
4399 && h->root.type == bfd_link_hash_common)
4404 align = bfd_log2 (isym->st_value);
4407 /* The new symbol is a common symbol in a shared object.
4408 We need to get the alignment from the section. */
4409 align = new_sec->alignment_power;
4411 if (align > old_alignment)
4412 h->root.u.c.p->alignment_power = align;
4414 h->root.u.c.p->alignment_power = old_alignment;
4417 if (is_elf_hash_table (htab))
4419 /* Set a flag in the hash table entry indicating the type of
4420 reference or definition we just found. A dynamic symbol
4421 is one which is referenced or defined by both a regular
4422 object and a shared object. */
4423 bfd_boolean dynsym = FALSE;
4425 /* Plugin symbols aren't normal. Don't set def_regular or
4426 ref_regular for them, or make them dynamic. */
4427 if ((abfd->flags & BFD_PLUGIN) != 0)
4434 if (bind != STB_WEAK)
4435 h->ref_regular_nonweak = 1;
4447 /* If the indirect symbol has been forced local, don't
4448 make the real symbol dynamic. */
4449 if ((h == hi || !hi->forced_local)
4450 && (bfd_link_dll (info)
4460 hi->ref_dynamic = 1;
4465 hi->def_dynamic = 1;
4468 /* If the indirect symbol has been forced local, don't
4469 make the real symbol dynamic. */
4470 if ((h == hi || !hi->forced_local)
4473 || (h->u.weakdef != NULL
4475 && h->u.weakdef->dynindx != -1)))
4479 /* Check to see if we need to add an indirect symbol for
4480 the default name. */
4482 || (!override && h->root.type == bfd_link_hash_common))
4483 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4484 sec, value, &old_bfd, &dynsym))
4485 goto error_free_vers;
4487 /* Check the alignment when a common symbol is involved. This
4488 can change when a common symbol is overridden by a normal
4489 definition or a common symbol is ignored due to the old
4490 normal definition. We need to make sure the maximum
4491 alignment is maintained. */
4492 if ((old_alignment || common)
4493 && h->root.type != bfd_link_hash_common)
4495 unsigned int common_align;
4496 unsigned int normal_align;
4497 unsigned int symbol_align;
4501 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4502 || h->root.type == bfd_link_hash_defweak);
4504 symbol_align = ffs (h->root.u.def.value) - 1;
4505 if (h->root.u.def.section->owner != NULL
4506 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4508 normal_align = h->root.u.def.section->alignment_power;
4509 if (normal_align > symbol_align)
4510 normal_align = symbol_align;
4513 normal_align = symbol_align;
4517 common_align = old_alignment;
4518 common_bfd = old_bfd;
4523 common_align = bfd_log2 (isym->st_value);
4525 normal_bfd = old_bfd;
4528 if (normal_align < common_align)
4530 /* PR binutils/2735 */
4531 if (normal_bfd == NULL)
4532 (*_bfd_error_handler)
4533 (_("Warning: alignment %u of common symbol `%s' in %B is"
4534 " greater than the alignment (%u) of its section %A"),
4535 common_bfd, h->root.u.def.section,
4536 1 << common_align, name, 1 << normal_align);
4538 (*_bfd_error_handler)
4539 (_("Warning: alignment %u of symbol `%s' in %B"
4540 " is smaller than %u in %B"),
4541 normal_bfd, common_bfd,
4542 1 << normal_align, name, 1 << common_align);
4546 /* Remember the symbol size if it isn't undefined. */
4547 if (isym->st_size != 0
4548 && isym->st_shndx != SHN_UNDEF
4549 && (definition || h->size == 0))
4552 && h->size != isym->st_size
4553 && ! size_change_ok)
4554 (*_bfd_error_handler)
4555 (_("Warning: size of symbol `%s' changed"
4556 " from %lu in %B to %lu in %B"),
4558 name, (unsigned long) h->size,
4559 (unsigned long) isym->st_size);
4561 h->size = isym->st_size;
4564 /* If this is a common symbol, then we always want H->SIZE
4565 to be the size of the common symbol. The code just above
4566 won't fix the size if a common symbol becomes larger. We
4567 don't warn about a size change here, because that is
4568 covered by --warn-common. Allow changes between different
4570 if (h->root.type == bfd_link_hash_common)
4571 h->size = h->root.u.c.size;
4573 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4574 && ((definition && !new_weak)
4575 || (old_weak && h->root.type == bfd_link_hash_common)
4576 || h->type == STT_NOTYPE))
4578 unsigned int type = ELF_ST_TYPE (isym->st_info);
4580 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4582 if (type == STT_GNU_IFUNC
4583 && (abfd->flags & DYNAMIC) != 0)
4586 if (h->type != type)
4588 if (h->type != STT_NOTYPE && ! type_change_ok)
4589 (*_bfd_error_handler)
4590 (_("Warning: type of symbol `%s' changed"
4591 " from %d to %d in %B"),
4592 abfd, name, h->type, type);
4598 /* Merge st_other field. */
4599 elf_merge_st_other (abfd, h, isym, sec, definition, dynamic);
4601 /* We don't want to make debug symbol dynamic. */
4603 && (sec->flags & SEC_DEBUGGING)
4604 && !bfd_link_relocatable (info))
4607 /* Nor should we make plugin symbols dynamic. */
4608 if ((abfd->flags & BFD_PLUGIN) != 0)
4613 h->target_internal = isym->st_target_internal;
4614 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4617 if (definition && !dynamic)
4619 char *p = strchr (name, ELF_VER_CHR);
4620 if (p != NULL && p[1] != ELF_VER_CHR)
4622 /* Queue non-default versions so that .symver x, x@FOO
4623 aliases can be checked. */
4626 amt = ((isymend - isym + 1)
4627 * sizeof (struct elf_link_hash_entry *));
4629 = (struct elf_link_hash_entry **) bfd_malloc (amt);
4631 goto error_free_vers;
4633 nondeflt_vers[nondeflt_vers_cnt++] = h;
4637 if (dynsym && h->dynindx == -1)
4639 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4640 goto error_free_vers;
4641 if (h->u.weakdef != NULL
4643 && h->u.weakdef->dynindx == -1)
4645 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4646 goto error_free_vers;
4649 else if (h->dynindx != -1)
4650 /* If the symbol already has a dynamic index, but
4651 visibility says it should not be visible, turn it into
4653 switch (ELF_ST_VISIBILITY (h->other))
4657 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4662 /* Don't add DT_NEEDED for references from the dummy bfd nor
4663 for unmatched symbol. */
4668 && h->ref_regular_nonweak
4670 || (old_bfd->flags & BFD_PLUGIN) == 0))
4671 || (h->ref_dynamic_nonweak
4672 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4673 && !on_needed_list (elf_dt_name (abfd),
4674 htab->needed, NULL))))
4677 const char *soname = elf_dt_name (abfd);
4679 info->callbacks->minfo ("%!", soname, old_bfd,
4680 h->root.root.string);
4682 /* A symbol from a library loaded via DT_NEEDED of some
4683 other library is referenced by a regular object.
4684 Add a DT_NEEDED entry for it. Issue an error if
4685 --no-add-needed is used and the reference was not
4688 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4690 (*_bfd_error_handler)
4691 (_("%B: undefined reference to symbol '%s'"),
4693 bfd_set_error (bfd_error_missing_dso);
4694 goto error_free_vers;
4697 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4698 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4701 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4703 goto error_free_vers;
4705 BFD_ASSERT (ret == 0);
4710 if (extversym != NULL)
4716 if (isymbuf != NULL)
4722 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4726 /* Restore the symbol table. */
4727 old_ent = (char *) old_tab + tabsize;
4728 memset (elf_sym_hashes (abfd), 0,
4729 extsymcount * sizeof (struct elf_link_hash_entry *));
4730 htab->root.table.table = old_table;
4731 htab->root.table.size = old_size;
4732 htab->root.table.count = old_count;
4733 memcpy (htab->root.table.table, old_tab, tabsize);
4734 htab->root.undefs = old_undefs;
4735 htab->root.undefs_tail = old_undefs_tail;
4736 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4737 for (i = 0; i < htab->root.table.size; i++)
4739 struct bfd_hash_entry *p;
4740 struct elf_link_hash_entry *h;
4742 unsigned int alignment_power;
4744 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4746 h = (struct elf_link_hash_entry *) p;
4747 if (h->root.type == bfd_link_hash_warning)
4748 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4749 if (h->dynindx >= old_dynsymcount
4750 && h->dynstr_index < old_dynstr_size)
4751 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4753 /* Preserve the maximum alignment and size for common
4754 symbols even if this dynamic lib isn't on DT_NEEDED
4755 since it can still be loaded at run time by another
4757 if (h->root.type == bfd_link_hash_common)
4759 size = h->root.u.c.size;
4760 alignment_power = h->root.u.c.p->alignment_power;
4765 alignment_power = 0;
4767 memcpy (p, old_ent, htab->root.table.entsize);
4768 old_ent = (char *) old_ent + htab->root.table.entsize;
4769 h = (struct elf_link_hash_entry *) p;
4770 if (h->root.type == bfd_link_hash_warning)
4772 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4773 old_ent = (char *) old_ent + htab->root.table.entsize;
4774 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4776 if (h->root.type == bfd_link_hash_common)
4778 if (size > h->root.u.c.size)
4779 h->root.u.c.size = size;
4780 if (alignment_power > h->root.u.c.p->alignment_power)
4781 h->root.u.c.p->alignment_power = alignment_power;
4786 /* Make a special call to the linker "notice" function to
4787 tell it that symbols added for crefs may need to be removed. */
4788 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4789 goto error_free_vers;
4792 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4794 if (nondeflt_vers != NULL)
4795 free (nondeflt_vers);
4799 if (old_tab != NULL)
4801 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4802 goto error_free_vers;
4807 /* Now that all the symbols from this input file are created, if
4808 not performing a relocatable link, handle .symver foo, foo@BAR
4809 such that any relocs against foo become foo@BAR. */
4810 if (!bfd_link_relocatable (info) && nondeflt_vers != NULL)
4812 bfd_size_type cnt, symidx;
4814 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4816 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4817 char *shortname, *p;
4819 p = strchr (h->root.root.string, ELF_VER_CHR);
4821 || (h->root.type != bfd_link_hash_defined
4822 && h->root.type != bfd_link_hash_defweak))
4825 amt = p - h->root.root.string;
4826 shortname = (char *) bfd_malloc (amt + 1);
4828 goto error_free_vers;
4829 memcpy (shortname, h->root.root.string, amt);
4830 shortname[amt] = '\0';
4832 hi = (struct elf_link_hash_entry *)
4833 bfd_link_hash_lookup (&htab->root, shortname,
4834 FALSE, FALSE, FALSE);
4836 && hi->root.type == h->root.type
4837 && hi->root.u.def.value == h->root.u.def.value
4838 && hi->root.u.def.section == h->root.u.def.section)
4840 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4841 hi->root.type = bfd_link_hash_indirect;
4842 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4843 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4844 sym_hash = elf_sym_hashes (abfd);
4846 for (symidx = 0; symidx < extsymcount; ++symidx)
4847 if (sym_hash[symidx] == hi)
4849 sym_hash[symidx] = h;
4855 free (nondeflt_vers);
4856 nondeflt_vers = NULL;
4859 /* Now set the weakdefs field correctly for all the weak defined
4860 symbols we found. The only way to do this is to search all the
4861 symbols. Since we only need the information for non functions in
4862 dynamic objects, that's the only time we actually put anything on
4863 the list WEAKS. We need this information so that if a regular
4864 object refers to a symbol defined weakly in a dynamic object, the
4865 real symbol in the dynamic object is also put in the dynamic
4866 symbols; we also must arrange for both symbols to point to the
4867 same memory location. We could handle the general case of symbol
4868 aliasing, but a general symbol alias can only be generated in
4869 assembler code, handling it correctly would be very time
4870 consuming, and other ELF linkers don't handle general aliasing
4874 struct elf_link_hash_entry **hpp;
4875 struct elf_link_hash_entry **hppend;
4876 struct elf_link_hash_entry **sorted_sym_hash;
4877 struct elf_link_hash_entry *h;
4880 /* Since we have to search the whole symbol list for each weak
4881 defined symbol, search time for N weak defined symbols will be
4882 O(N^2). Binary search will cut it down to O(NlogN). */
4883 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4884 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4885 if (sorted_sym_hash == NULL)
4887 sym_hash = sorted_sym_hash;
4888 hpp = elf_sym_hashes (abfd);
4889 hppend = hpp + extsymcount;
4891 for (; hpp < hppend; hpp++)
4895 && h->root.type == bfd_link_hash_defined
4896 && !bed->is_function_type (h->type))
4904 qsort (sorted_sym_hash, sym_count,
4905 sizeof (struct elf_link_hash_entry *),
4908 while (weaks != NULL)
4910 struct elf_link_hash_entry *hlook;
4913 size_t i, j, idx = 0;
4916 weaks = hlook->u.weakdef;
4917 hlook->u.weakdef = NULL;
4919 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4920 || hlook->root.type == bfd_link_hash_defweak
4921 || hlook->root.type == bfd_link_hash_common
4922 || hlook->root.type == bfd_link_hash_indirect);
4923 slook = hlook->root.u.def.section;
4924 vlook = hlook->root.u.def.value;
4930 bfd_signed_vma vdiff;
4932 h = sorted_sym_hash[idx];
4933 vdiff = vlook - h->root.u.def.value;
4940 int sdiff = slook->id - h->root.u.def.section->id;
4950 /* We didn't find a value/section match. */
4954 /* With multiple aliases, or when the weak symbol is already
4955 strongly defined, we have multiple matching symbols and
4956 the binary search above may land on any of them. Step
4957 one past the matching symbol(s). */
4960 h = sorted_sym_hash[idx];
4961 if (h->root.u.def.section != slook
4962 || h->root.u.def.value != vlook)
4966 /* Now look back over the aliases. Since we sorted by size
4967 as well as value and section, we'll choose the one with
4968 the largest size. */
4971 h = sorted_sym_hash[idx];
4973 /* Stop if value or section doesn't match. */
4974 if (h->root.u.def.section != slook
4975 || h->root.u.def.value != vlook)
4977 else if (h != hlook)
4979 hlook->u.weakdef = h;
4981 /* If the weak definition is in the list of dynamic
4982 symbols, make sure the real definition is put
4984 if (hlook->dynindx != -1 && h->dynindx == -1)
4986 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4989 free (sorted_sym_hash);
4994 /* If the real definition is in the list of dynamic
4995 symbols, make sure the weak definition is put
4996 there as well. If we don't do this, then the
4997 dynamic loader might not merge the entries for the
4998 real definition and the weak definition. */
4999 if (h->dynindx != -1 && hlook->dynindx == -1)
5001 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
5002 goto err_free_sym_hash;
5009 free (sorted_sym_hash);
5012 if (bed->check_directives
5013 && !(*bed->check_directives) (abfd, info))
5016 if (!info->check_relocs_after_open_input
5017 && !_bfd_elf_link_check_relocs (abfd, info))
5020 /* If this is a non-traditional link, try to optimize the handling
5021 of the .stab/.stabstr sections. */
5023 && ! info->traditional_format
5024 && is_elf_hash_table (htab)
5025 && (info->strip != strip_all && info->strip != strip_debugger))
5029 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
5030 if (stabstr != NULL)
5032 bfd_size_type string_offset = 0;
5035 for (stab = abfd->sections; stab; stab = stab->next)
5036 if (CONST_STRNEQ (stab->name, ".stab")
5037 && (!stab->name[5] ||
5038 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
5039 && (stab->flags & SEC_MERGE) == 0
5040 && !bfd_is_abs_section (stab->output_section))
5042 struct bfd_elf_section_data *secdata;
5044 secdata = elf_section_data (stab);
5045 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
5046 stabstr, &secdata->sec_info,
5049 if (secdata->sec_info)
5050 stab->sec_info_type = SEC_INFO_TYPE_STABS;
5055 if (is_elf_hash_table (htab) && add_needed)
5057 /* Add this bfd to the loaded list. */
5058 struct elf_link_loaded_list *n;
5060 n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n));
5064 n->next = htab->loaded;
5071 if (old_tab != NULL)
5073 if (nondeflt_vers != NULL)
5074 free (nondeflt_vers);
5075 if (extversym != NULL)
5078 if (isymbuf != NULL)
5084 /* Return the linker hash table entry of a symbol that might be
5085 satisfied by an archive symbol. Return -1 on error. */
5087 struct elf_link_hash_entry *
5088 _bfd_elf_archive_symbol_lookup (bfd *abfd,
5089 struct bfd_link_info *info,
5092 struct elf_link_hash_entry *h;
5096 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
5100 /* If this is a default version (the name contains @@), look up the
5101 symbol again with only one `@' as well as without the version.
5102 The effect is that references to the symbol with and without the
5103 version will be matched by the default symbol in the archive. */
5105 p = strchr (name, ELF_VER_CHR);
5106 if (p == NULL || p[1] != ELF_VER_CHR)
5109 /* First check with only one `@'. */
5110 len = strlen (name);
5111 copy = (char *) bfd_alloc (abfd, len);
5113 return (struct elf_link_hash_entry *) 0 - 1;
5115 first = p - name + 1;
5116 memcpy (copy, name, first);
5117 memcpy (copy + first, name + first + 1, len - first);
5119 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
5122 /* We also need to check references to the symbol without the
5124 copy[first - 1] = '\0';
5125 h = elf_link_hash_lookup (elf_hash_table (info), copy,
5126 FALSE, FALSE, TRUE);
5129 bfd_release (abfd, copy);
5133 /* Add symbols from an ELF archive file to the linker hash table. We
5134 don't use _bfd_generic_link_add_archive_symbols because we need to
5135 handle versioned symbols.
5137 Fortunately, ELF archive handling is simpler than that done by
5138 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5139 oddities. In ELF, if we find a symbol in the archive map, and the
5140 symbol is currently undefined, we know that we must pull in that
5143 Unfortunately, we do have to make multiple passes over the symbol
5144 table until nothing further is resolved. */
5147 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
5150 unsigned char *included = NULL;
5154 const struct elf_backend_data *bed;
5155 struct elf_link_hash_entry * (*archive_symbol_lookup)
5156 (bfd *, struct bfd_link_info *, const char *);
5158 if (! bfd_has_map (abfd))
5160 /* An empty archive is a special case. */
5161 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
5163 bfd_set_error (bfd_error_no_armap);
5167 /* Keep track of all symbols we know to be already defined, and all
5168 files we know to be already included. This is to speed up the
5169 second and subsequent passes. */
5170 c = bfd_ardata (abfd)->symdef_count;
5174 amt *= sizeof (*included);
5175 included = (unsigned char *) bfd_zmalloc (amt);
5176 if (included == NULL)
5179 symdefs = bfd_ardata (abfd)->symdefs;
5180 bed = get_elf_backend_data (abfd);
5181 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5194 symdefend = symdef + c;
5195 for (i = 0; symdef < symdefend; symdef++, i++)
5197 struct elf_link_hash_entry *h;
5199 struct bfd_link_hash_entry *undefs_tail;
5204 if (symdef->file_offset == last)
5210 h = archive_symbol_lookup (abfd, info, symdef->name);
5211 if (h == (struct elf_link_hash_entry *) 0 - 1)
5217 if (h->root.type == bfd_link_hash_common)
5219 /* We currently have a common symbol. The archive map contains
5220 a reference to this symbol, so we may want to include it. We
5221 only want to include it however, if this archive element
5222 contains a definition of the symbol, not just another common
5225 Unfortunately some archivers (including GNU ar) will put
5226 declarations of common symbols into their archive maps, as
5227 well as real definitions, so we cannot just go by the archive
5228 map alone. Instead we must read in the element's symbol
5229 table and check that to see what kind of symbol definition
5231 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5234 else if (h->root.type != bfd_link_hash_undefined)
5236 if (h->root.type != bfd_link_hash_undefweak)
5237 /* Symbol must be defined. Don't check it again. */
5242 /* We need to include this archive member. */
5243 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5244 if (element == NULL)
5247 if (! bfd_check_format (element, bfd_object))
5250 undefs_tail = info->hash->undefs_tail;
5252 if (!(*info->callbacks
5253 ->add_archive_element) (info, element, symdef->name, &element))
5255 if (!bfd_link_add_symbols (element, info))
5258 /* If there are any new undefined symbols, we need to make
5259 another pass through the archive in order to see whether
5260 they can be defined. FIXME: This isn't perfect, because
5261 common symbols wind up on undefs_tail and because an
5262 undefined symbol which is defined later on in this pass
5263 does not require another pass. This isn't a bug, but it
5264 does make the code less efficient than it could be. */
5265 if (undefs_tail != info->hash->undefs_tail)
5268 /* Look backward to mark all symbols from this object file
5269 which we have already seen in this pass. */
5273 included[mark] = TRUE;
5278 while (symdefs[mark].file_offset == symdef->file_offset);
5280 /* We mark subsequent symbols from this object file as we go
5281 on through the loop. */
5282 last = symdef->file_offset;
5292 if (included != NULL)
5297 /* Given an ELF BFD, add symbols to the global hash table as
5301 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5303 switch (bfd_get_format (abfd))
5306 return elf_link_add_object_symbols (abfd, info);
5308 return elf_link_add_archive_symbols (abfd, info);
5310 bfd_set_error (bfd_error_wrong_format);
5315 struct hash_codes_info
5317 unsigned long *hashcodes;
5321 /* This function will be called though elf_link_hash_traverse to store
5322 all hash value of the exported symbols in an array. */
5325 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5327 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5332 /* Ignore indirect symbols. These are added by the versioning code. */
5333 if (h->dynindx == -1)
5336 name = h->root.root.string;
5337 if (h->versioned >= versioned)
5339 char *p = strchr (name, ELF_VER_CHR);
5342 alc = (char *) bfd_malloc (p - name + 1);
5348 memcpy (alc, name, p - name);
5349 alc[p - name] = '\0';
5354 /* Compute the hash value. */
5355 ha = bfd_elf_hash (name);
5357 /* Store the found hash value in the array given as the argument. */
5358 *(inf->hashcodes)++ = ha;
5360 /* And store it in the struct so that we can put it in the hash table
5362 h->u.elf_hash_value = ha;
5370 struct collect_gnu_hash_codes
5373 const struct elf_backend_data *bed;
5374 unsigned long int nsyms;
5375 unsigned long int maskbits;
5376 unsigned long int *hashcodes;
5377 unsigned long int *hashval;
5378 unsigned long int *indx;
5379 unsigned long int *counts;
5382 long int min_dynindx;
5383 unsigned long int bucketcount;
5384 unsigned long int symindx;
5385 long int local_indx;
5386 long int shift1, shift2;
5387 unsigned long int mask;
5391 /* This function will be called though elf_link_hash_traverse to store
5392 all hash value of the exported symbols in an array. */
5395 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5397 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5402 /* Ignore indirect symbols. These are added by the versioning code. */
5403 if (h->dynindx == -1)
5406 /* Ignore also local symbols and undefined symbols. */
5407 if (! (*s->bed->elf_hash_symbol) (h))
5410 name = h->root.root.string;
5411 if (h->versioned >= versioned)
5413 char *p = strchr (name, ELF_VER_CHR);
5416 alc = (char *) bfd_malloc (p - name + 1);
5422 memcpy (alc, name, p - name);
5423 alc[p - name] = '\0';
5428 /* Compute the hash value. */
5429 ha = bfd_elf_gnu_hash (name);
5431 /* Store the found hash value in the array for compute_bucket_count,
5432 and also for .dynsym reordering purposes. */
5433 s->hashcodes[s->nsyms] = ha;
5434 s->hashval[h->dynindx] = ha;
5436 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5437 s->min_dynindx = h->dynindx;
5445 /* This function will be called though elf_link_hash_traverse to do
5446 final dynaminc symbol renumbering. */
5449 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5451 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5452 unsigned long int bucket;
5453 unsigned long int val;
5455 /* Ignore indirect symbols. */
5456 if (h->dynindx == -1)
5459 /* Ignore also local symbols and undefined symbols. */
5460 if (! (*s->bed->elf_hash_symbol) (h))
5462 if (h->dynindx >= s->min_dynindx)
5463 h->dynindx = s->local_indx++;
5467 bucket = s->hashval[h->dynindx] % s->bucketcount;
5468 val = (s->hashval[h->dynindx] >> s->shift1)
5469 & ((s->maskbits >> s->shift1) - 1);
5470 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5472 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5473 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5474 if (s->counts[bucket] == 1)
5475 /* Last element terminates the chain. */
5477 bfd_put_32 (s->output_bfd, val,
5478 s->contents + (s->indx[bucket] - s->symindx) * 4);
5479 --s->counts[bucket];
5480 h->dynindx = s->indx[bucket]++;
5484 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5487 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5489 return !(h->forced_local
5490 || h->root.type == bfd_link_hash_undefined
5491 || h->root.type == bfd_link_hash_undefweak
5492 || ((h->root.type == bfd_link_hash_defined
5493 || h->root.type == bfd_link_hash_defweak)
5494 && h->root.u.def.section->output_section == NULL));
5497 /* Array used to determine the number of hash table buckets to use
5498 based on the number of symbols there are. If there are fewer than
5499 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5500 fewer than 37 we use 17 buckets, and so forth. We never use more
5501 than 32771 buckets. */
5503 static const size_t elf_buckets[] =
5505 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5509 /* Compute bucket count for hashing table. We do not use a static set
5510 of possible tables sizes anymore. Instead we determine for all
5511 possible reasonable sizes of the table the outcome (i.e., the
5512 number of collisions etc) and choose the best solution. The
5513 weighting functions are not too simple to allow the table to grow
5514 without bounds. Instead one of the weighting factors is the size.
5515 Therefore the result is always a good payoff between few collisions
5516 (= short chain lengths) and table size. */
5518 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5519 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5520 unsigned long int nsyms,
5523 size_t best_size = 0;
5524 unsigned long int i;
5526 /* We have a problem here. The following code to optimize the table
5527 size requires an integer type with more the 32 bits. If
5528 BFD_HOST_U_64_BIT is set we know about such a type. */
5529 #ifdef BFD_HOST_U_64_BIT
5534 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5535 bfd *dynobj = elf_hash_table (info)->dynobj;
5536 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5537 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5538 unsigned long int *counts;
5540 unsigned int no_improvement_count = 0;
5542 /* Possible optimization parameters: if we have NSYMS symbols we say
5543 that the hashing table must at least have NSYMS/4 and at most
5545 minsize = nsyms / 4;
5548 best_size = maxsize = nsyms * 2;
5553 if ((best_size & 31) == 0)
5557 /* Create array where we count the collisions in. We must use bfd_malloc
5558 since the size could be large. */
5560 amt *= sizeof (unsigned long int);
5561 counts = (unsigned long int *) bfd_malloc (amt);
5565 /* Compute the "optimal" size for the hash table. The criteria is a
5566 minimal chain length. The minor criteria is (of course) the size
5568 for (i = minsize; i < maxsize; ++i)
5570 /* Walk through the array of hashcodes and count the collisions. */
5571 BFD_HOST_U_64_BIT max;
5572 unsigned long int j;
5573 unsigned long int fact;
5575 if (gnu_hash && (i & 31) == 0)
5578 memset (counts, '\0', i * sizeof (unsigned long int));
5580 /* Determine how often each hash bucket is used. */
5581 for (j = 0; j < nsyms; ++j)
5582 ++counts[hashcodes[j] % i];
5584 /* For the weight function we need some information about the
5585 pagesize on the target. This is information need not be 100%
5586 accurate. Since this information is not available (so far) we
5587 define it here to a reasonable default value. If it is crucial
5588 to have a better value some day simply define this value. */
5589 # ifndef BFD_TARGET_PAGESIZE
5590 # define BFD_TARGET_PAGESIZE (4096)
5593 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5595 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5598 /* Variant 1: optimize for short chains. We add the squares
5599 of all the chain lengths (which favors many small chain
5600 over a few long chains). */
5601 for (j = 0; j < i; ++j)
5602 max += counts[j] * counts[j];
5604 /* This adds penalties for the overall size of the table. */
5605 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5608 /* Variant 2: Optimize a lot more for small table. Here we
5609 also add squares of the size but we also add penalties for
5610 empty slots (the +1 term). */
5611 for (j = 0; j < i; ++j)
5612 max += (1 + counts[j]) * (1 + counts[j]);
5614 /* The overall size of the table is considered, but not as
5615 strong as in variant 1, where it is squared. */
5616 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5620 /* Compare with current best results. */
5621 if (max < best_chlen)
5625 no_improvement_count = 0;
5627 /* PR 11843: Avoid futile long searches for the best bucket size
5628 when there are a large number of symbols. */
5629 else if (++no_improvement_count == 100)
5636 #endif /* defined (BFD_HOST_U_64_BIT) */
5638 /* This is the fallback solution if no 64bit type is available or if we
5639 are not supposed to spend much time on optimizations. We select the
5640 bucket count using a fixed set of numbers. */
5641 for (i = 0; elf_buckets[i] != 0; i++)
5643 best_size = elf_buckets[i];
5644 if (nsyms < elf_buckets[i + 1])
5647 if (gnu_hash && best_size < 2)
5654 /* Size any SHT_GROUP section for ld -r. */
5657 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5661 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5662 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5663 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5668 /* Set a default stack segment size. The value in INFO wins. If it
5669 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5670 undefined it is initialized. */
5673 bfd_elf_stack_segment_size (bfd *output_bfd,
5674 struct bfd_link_info *info,
5675 const char *legacy_symbol,
5676 bfd_vma default_size)
5678 struct elf_link_hash_entry *h = NULL;
5680 /* Look for legacy symbol. */
5682 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5683 FALSE, FALSE, FALSE);
5684 if (h && (h->root.type == bfd_link_hash_defined
5685 || h->root.type == bfd_link_hash_defweak)
5687 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5689 /* The symbol has no type if specified on the command line. */
5690 h->type = STT_OBJECT;
5691 if (info->stacksize)
5692 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5693 output_bfd, legacy_symbol);
5694 else if (h->root.u.def.section != bfd_abs_section_ptr)
5695 (*_bfd_error_handler) (_("%B: %s not absolute"),
5696 output_bfd, legacy_symbol);
5698 info->stacksize = h->root.u.def.value;
5701 if (!info->stacksize)
5702 /* If the user didn't set a size, or explicitly inhibit the
5703 size, set it now. */
5704 info->stacksize = default_size;
5706 /* Provide the legacy symbol, if it is referenced. */
5707 if (h && (h->root.type == bfd_link_hash_undefined
5708 || h->root.type == bfd_link_hash_undefweak))
5710 struct bfd_link_hash_entry *bh = NULL;
5712 if (!(_bfd_generic_link_add_one_symbol
5713 (info, output_bfd, legacy_symbol,
5714 BSF_GLOBAL, bfd_abs_section_ptr,
5715 info->stacksize >= 0 ? info->stacksize : 0,
5716 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5719 h = (struct elf_link_hash_entry *) bh;
5721 h->type = STT_OBJECT;
5727 /* Set up the sizes and contents of the ELF dynamic sections. This is
5728 called by the ELF linker emulation before_allocation routine. We
5729 must set the sizes of the sections before the linker sets the
5730 addresses of the various sections. */
5733 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5736 const char *filter_shlib,
5738 const char *depaudit,
5739 const char * const *auxiliary_filters,
5740 struct bfd_link_info *info,
5741 asection **sinterpptr)
5743 bfd_size_type soname_indx;
5745 const struct elf_backend_data *bed;
5746 struct elf_info_failed asvinfo;
5750 soname_indx = (bfd_size_type) -1;
5752 if (!is_elf_hash_table (info->hash))
5755 bed = get_elf_backend_data (output_bfd);
5757 /* Any syms created from now on start with -1 in
5758 got.refcount/offset and plt.refcount/offset. */
5759 elf_hash_table (info)->init_got_refcount
5760 = elf_hash_table (info)->init_got_offset;
5761 elf_hash_table (info)->init_plt_refcount
5762 = elf_hash_table (info)->init_plt_offset;
5764 if (bfd_link_relocatable (info)
5765 && !_bfd_elf_size_group_sections (info))
5768 /* The backend may have to create some sections regardless of whether
5769 we're dynamic or not. */
5770 if (bed->elf_backend_always_size_sections
5771 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5774 /* Determine any GNU_STACK segment requirements, after the backend
5775 has had a chance to set a default segment size. */
5776 if (info->execstack)
5777 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5778 else if (info->noexecstack)
5779 elf_stack_flags (output_bfd) = PF_R | PF_W;
5783 asection *notesec = NULL;
5786 for (inputobj = info->input_bfds;
5788 inputobj = inputobj->link.next)
5793 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5795 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5798 if (s->flags & SEC_CODE)
5802 else if (bed->default_execstack)
5805 if (notesec || info->stacksize > 0)
5806 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5807 if (notesec && exec && bfd_link_relocatable (info)
5808 && notesec->output_section != bfd_abs_section_ptr)
5809 notesec->output_section->flags |= SEC_CODE;
5812 dynobj = elf_hash_table (info)->dynobj;
5814 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5816 struct elf_info_failed eif;
5817 struct elf_link_hash_entry *h;
5819 struct bfd_elf_version_tree *t;
5820 struct bfd_elf_version_expr *d;
5822 bfd_boolean all_defined;
5824 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5825 BFD_ASSERT (*sinterpptr != NULL || !bfd_link_executable (info) || info->nointerp);
5829 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5831 if (soname_indx == (bfd_size_type) -1
5832 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5838 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5840 info->flags |= DF_SYMBOLIC;
5848 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5850 if (indx == (bfd_size_type) -1)
5853 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5854 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5858 if (filter_shlib != NULL)
5862 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5863 filter_shlib, TRUE);
5864 if (indx == (bfd_size_type) -1
5865 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5869 if (auxiliary_filters != NULL)
5871 const char * const *p;
5873 for (p = auxiliary_filters; *p != NULL; p++)
5877 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5879 if (indx == (bfd_size_type) -1
5880 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5889 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5891 if (indx == (bfd_size_type) -1
5892 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5896 if (depaudit != NULL)
5900 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5902 if (indx == (bfd_size_type) -1
5903 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5910 /* If we are supposed to export all symbols into the dynamic symbol
5911 table (this is not the normal case), then do so. */
5912 if (info->export_dynamic
5913 || (bfd_link_executable (info) && info->dynamic))
5915 elf_link_hash_traverse (elf_hash_table (info),
5916 _bfd_elf_export_symbol,
5922 /* Make all global versions with definition. */
5923 for (t = info->version_info; t != NULL; t = t->next)
5924 for (d = t->globals.list; d != NULL; d = d->next)
5925 if (!d->symver && d->literal)
5927 const char *verstr, *name;
5928 size_t namelen, verlen, newlen;
5929 char *newname, *p, leading_char;
5930 struct elf_link_hash_entry *newh;
5932 leading_char = bfd_get_symbol_leading_char (output_bfd);
5934 namelen = strlen (name) + (leading_char != '\0');
5936 verlen = strlen (verstr);
5937 newlen = namelen + verlen + 3;
5939 newname = (char *) bfd_malloc (newlen);
5940 if (newname == NULL)
5942 newname[0] = leading_char;
5943 memcpy (newname + (leading_char != '\0'), name, namelen);
5945 /* Check the hidden versioned definition. */
5946 p = newname + namelen;
5948 memcpy (p, verstr, verlen + 1);
5949 newh = elf_link_hash_lookup (elf_hash_table (info),
5950 newname, FALSE, FALSE,
5953 || (newh->root.type != bfd_link_hash_defined
5954 && newh->root.type != bfd_link_hash_defweak))
5956 /* Check the default versioned definition. */
5958 memcpy (p, verstr, verlen + 1);
5959 newh = elf_link_hash_lookup (elf_hash_table (info),
5960 newname, FALSE, FALSE,
5965 /* Mark this version if there is a definition and it is
5966 not defined in a shared object. */
5968 && !newh->def_dynamic
5969 && (newh->root.type == bfd_link_hash_defined
5970 || newh->root.type == bfd_link_hash_defweak))
5974 /* Attach all the symbols to their version information. */
5975 asvinfo.info = info;
5976 asvinfo.failed = FALSE;
5978 elf_link_hash_traverse (elf_hash_table (info),
5979 _bfd_elf_link_assign_sym_version,
5984 if (!info->allow_undefined_version)
5986 /* Check if all global versions have a definition. */
5988 for (t = info->version_info; t != NULL; t = t->next)
5989 for (d = t->globals.list; d != NULL; d = d->next)
5990 if (d->literal && !d->symver && !d->script)
5992 (*_bfd_error_handler)
5993 (_("%s: undefined version: %s"),
5994 d->pattern, t->name);
5995 all_defined = FALSE;
6000 bfd_set_error (bfd_error_bad_value);
6005 /* Find all symbols which were defined in a dynamic object and make
6006 the backend pick a reasonable value for them. */
6007 elf_link_hash_traverse (elf_hash_table (info),
6008 _bfd_elf_adjust_dynamic_symbol,
6013 /* Add some entries to the .dynamic section. We fill in some of the
6014 values later, in bfd_elf_final_link, but we must add the entries
6015 now so that we know the final size of the .dynamic section. */
6017 /* If there are initialization and/or finalization functions to
6018 call then add the corresponding DT_INIT/DT_FINI entries. */
6019 h = (info->init_function
6020 ? elf_link_hash_lookup (elf_hash_table (info),
6021 info->init_function, FALSE,
6028 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
6031 h = (info->fini_function
6032 ? elf_link_hash_lookup (elf_hash_table (info),
6033 info->fini_function, FALSE,
6040 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
6044 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
6045 if (s != NULL && s->linker_has_input)
6047 /* DT_PREINIT_ARRAY is not allowed in shared library. */
6048 if (! bfd_link_executable (info))
6053 for (sub = info->input_bfds; sub != NULL;
6054 sub = sub->link.next)
6055 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
6056 for (o = sub->sections; o != NULL; o = o->next)
6057 if (elf_section_data (o)->this_hdr.sh_type
6058 == SHT_PREINIT_ARRAY)
6060 (*_bfd_error_handler)
6061 (_("%B: .preinit_array section is not allowed in DSO"),
6066 bfd_set_error (bfd_error_nonrepresentable_section);
6070 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
6071 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
6074 s = bfd_get_section_by_name (output_bfd, ".init_array");
6075 if (s != NULL && s->linker_has_input)
6077 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
6078 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
6081 s = bfd_get_section_by_name (output_bfd, ".fini_array");
6082 if (s != NULL && s->linker_has_input)
6084 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
6085 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
6089 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
6090 /* If .dynstr is excluded from the link, we don't want any of
6091 these tags. Strictly, we should be checking each section
6092 individually; This quick check covers for the case where
6093 someone does a /DISCARD/ : { *(*) }. */
6094 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
6096 bfd_size_type strsize;
6098 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6099 if ((info->emit_hash
6100 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
6101 || (info->emit_gnu_hash
6102 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
6103 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
6104 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
6105 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
6106 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
6107 bed->s->sizeof_sym))
6112 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
6115 /* The backend must work out the sizes of all the other dynamic
6118 && bed->elf_backend_size_dynamic_sections != NULL
6119 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
6122 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
6124 unsigned long section_sym_count;
6125 struct bfd_elf_version_tree *verdefs;
6128 /* Set up the version definition section. */
6129 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
6130 BFD_ASSERT (s != NULL);
6132 /* We may have created additional version definitions if we are
6133 just linking a regular application. */
6134 verdefs = info->version_info;
6136 /* Skip anonymous version tag. */
6137 if (verdefs != NULL && verdefs->vernum == 0)
6138 verdefs = verdefs->next;
6140 if (verdefs == NULL && !info->create_default_symver)
6141 s->flags |= SEC_EXCLUDE;
6146 struct bfd_elf_version_tree *t;
6148 Elf_Internal_Verdef def;
6149 Elf_Internal_Verdaux defaux;
6150 struct bfd_link_hash_entry *bh;
6151 struct elf_link_hash_entry *h;
6157 /* Make space for the base version. */
6158 size += sizeof (Elf_External_Verdef);
6159 size += sizeof (Elf_External_Verdaux);
6162 /* Make space for the default version. */
6163 if (info->create_default_symver)
6165 size += sizeof (Elf_External_Verdef);
6169 for (t = verdefs; t != NULL; t = t->next)
6171 struct bfd_elf_version_deps *n;
6173 /* Don't emit base version twice. */
6177 size += sizeof (Elf_External_Verdef);
6178 size += sizeof (Elf_External_Verdaux);
6181 for (n = t->deps; n != NULL; n = n->next)
6182 size += sizeof (Elf_External_Verdaux);
6186 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6187 if (s->contents == NULL && s->size != 0)
6190 /* Fill in the version definition section. */
6194 def.vd_version = VER_DEF_CURRENT;
6195 def.vd_flags = VER_FLG_BASE;
6198 if (info->create_default_symver)
6200 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
6201 def.vd_next = sizeof (Elf_External_Verdef);
6205 def.vd_aux = sizeof (Elf_External_Verdef);
6206 def.vd_next = (sizeof (Elf_External_Verdef)
6207 + sizeof (Elf_External_Verdaux));
6210 if (soname_indx != (bfd_size_type) -1)
6212 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6214 def.vd_hash = bfd_elf_hash (soname);
6215 defaux.vda_name = soname_indx;
6222 name = lbasename (output_bfd->filename);
6223 def.vd_hash = bfd_elf_hash (name);
6224 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6226 if (indx == (bfd_size_type) -1)
6228 defaux.vda_name = indx;
6230 defaux.vda_next = 0;
6232 _bfd_elf_swap_verdef_out (output_bfd, &def,
6233 (Elf_External_Verdef *) p);
6234 p += sizeof (Elf_External_Verdef);
6235 if (info->create_default_symver)
6237 /* Add a symbol representing this version. */
6239 if (! (_bfd_generic_link_add_one_symbol
6240 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6242 get_elf_backend_data (dynobj)->collect, &bh)))
6244 h = (struct elf_link_hash_entry *) bh;
6247 h->type = STT_OBJECT;
6248 h->verinfo.vertree = NULL;
6250 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6253 /* Create a duplicate of the base version with the same
6254 aux block, but different flags. */
6257 def.vd_aux = sizeof (Elf_External_Verdef);
6259 def.vd_next = (sizeof (Elf_External_Verdef)
6260 + sizeof (Elf_External_Verdaux));
6263 _bfd_elf_swap_verdef_out (output_bfd, &def,
6264 (Elf_External_Verdef *) p);
6265 p += sizeof (Elf_External_Verdef);
6267 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6268 (Elf_External_Verdaux *) p);
6269 p += sizeof (Elf_External_Verdaux);
6271 for (t = verdefs; t != NULL; t = t->next)
6274 struct bfd_elf_version_deps *n;
6276 /* Don't emit the base version twice. */
6281 for (n = t->deps; n != NULL; n = n->next)
6284 /* Add a symbol representing this version. */
6286 if (! (_bfd_generic_link_add_one_symbol
6287 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6289 get_elf_backend_data (dynobj)->collect, &bh)))
6291 h = (struct elf_link_hash_entry *) bh;
6294 h->type = STT_OBJECT;
6295 h->verinfo.vertree = t;
6297 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6300 def.vd_version = VER_DEF_CURRENT;
6302 if (t->globals.list == NULL
6303 && t->locals.list == NULL
6305 def.vd_flags |= VER_FLG_WEAK;
6306 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6307 def.vd_cnt = cdeps + 1;
6308 def.vd_hash = bfd_elf_hash (t->name);
6309 def.vd_aux = sizeof (Elf_External_Verdef);
6312 /* If a basever node is next, it *must* be the last node in
6313 the chain, otherwise Verdef construction breaks. */
6314 if (t->next != NULL && t->next->vernum == 0)
6315 BFD_ASSERT (t->next->next == NULL);
6317 if (t->next != NULL && t->next->vernum != 0)
6318 def.vd_next = (sizeof (Elf_External_Verdef)
6319 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6321 _bfd_elf_swap_verdef_out (output_bfd, &def,
6322 (Elf_External_Verdef *) p);
6323 p += sizeof (Elf_External_Verdef);
6325 defaux.vda_name = h->dynstr_index;
6326 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6328 defaux.vda_next = 0;
6329 if (t->deps != NULL)
6330 defaux.vda_next = sizeof (Elf_External_Verdaux);
6331 t->name_indx = defaux.vda_name;
6333 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6334 (Elf_External_Verdaux *) p);
6335 p += sizeof (Elf_External_Verdaux);
6337 for (n = t->deps; n != NULL; n = n->next)
6339 if (n->version_needed == NULL)
6341 /* This can happen if there was an error in the
6343 defaux.vda_name = 0;
6347 defaux.vda_name = n->version_needed->name_indx;
6348 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6351 if (n->next == NULL)
6352 defaux.vda_next = 0;
6354 defaux.vda_next = sizeof (Elf_External_Verdaux);
6356 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6357 (Elf_External_Verdaux *) p);
6358 p += sizeof (Elf_External_Verdaux);
6362 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6363 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6366 elf_tdata (output_bfd)->cverdefs = cdefs;
6369 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6371 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6374 else if (info->flags & DF_BIND_NOW)
6376 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6382 if (bfd_link_executable (info))
6383 info->flags_1 &= ~ (DF_1_INITFIRST
6386 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6390 /* Work out the size of the version reference section. */
6392 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6393 BFD_ASSERT (s != NULL);
6395 struct elf_find_verdep_info sinfo;
6398 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6399 if (sinfo.vers == 0)
6401 sinfo.failed = FALSE;
6403 elf_link_hash_traverse (elf_hash_table (info),
6404 _bfd_elf_link_find_version_dependencies,
6409 if (elf_tdata (output_bfd)->verref == NULL)
6410 s->flags |= SEC_EXCLUDE;
6413 Elf_Internal_Verneed *t;
6418 /* Build the version dependency section. */
6421 for (t = elf_tdata (output_bfd)->verref;
6425 Elf_Internal_Vernaux *a;
6427 size += sizeof (Elf_External_Verneed);
6429 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6430 size += sizeof (Elf_External_Vernaux);
6434 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6435 if (s->contents == NULL)
6439 for (t = elf_tdata (output_bfd)->verref;
6444 Elf_Internal_Vernaux *a;
6448 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6451 t->vn_version = VER_NEED_CURRENT;
6453 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6454 elf_dt_name (t->vn_bfd) != NULL
6455 ? elf_dt_name (t->vn_bfd)
6456 : lbasename (t->vn_bfd->filename),
6458 if (indx == (bfd_size_type) -1)
6461 t->vn_aux = sizeof (Elf_External_Verneed);
6462 if (t->vn_nextref == NULL)
6465 t->vn_next = (sizeof (Elf_External_Verneed)
6466 + caux * sizeof (Elf_External_Vernaux));
6468 _bfd_elf_swap_verneed_out (output_bfd, t,
6469 (Elf_External_Verneed *) p);
6470 p += sizeof (Elf_External_Verneed);
6472 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6474 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6475 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6476 a->vna_nodename, FALSE);
6477 if (indx == (bfd_size_type) -1)
6480 if (a->vna_nextptr == NULL)
6483 a->vna_next = sizeof (Elf_External_Vernaux);
6485 _bfd_elf_swap_vernaux_out (output_bfd, a,
6486 (Elf_External_Vernaux *) p);
6487 p += sizeof (Elf_External_Vernaux);
6491 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6492 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6495 elf_tdata (output_bfd)->cverrefs = crefs;
6499 if ((elf_tdata (output_bfd)->cverrefs == 0
6500 && elf_tdata (output_bfd)->cverdefs == 0)
6501 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6502 §ion_sym_count) == 0)
6504 s = bfd_get_linker_section (dynobj, ".gnu.version");
6505 s->flags |= SEC_EXCLUDE;
6511 /* Find the first non-excluded output section. We'll use its
6512 section symbol for some emitted relocs. */
6514 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6518 for (s = output_bfd->sections; s != NULL; s = s->next)
6519 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6520 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6522 elf_hash_table (info)->text_index_section = s;
6527 /* Find two non-excluded output sections, one for code, one for data.
6528 We'll use their section symbols for some emitted relocs. */
6530 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6534 /* Data first, since setting text_index_section changes
6535 _bfd_elf_link_omit_section_dynsym. */
6536 for (s = output_bfd->sections; s != NULL; s = s->next)
6537 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6538 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6540 elf_hash_table (info)->data_index_section = s;
6544 for (s = output_bfd->sections; s != NULL; s = s->next)
6545 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6546 == (SEC_ALLOC | SEC_READONLY))
6547 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6549 elf_hash_table (info)->text_index_section = s;
6553 if (elf_hash_table (info)->text_index_section == NULL)
6554 elf_hash_table (info)->text_index_section
6555 = elf_hash_table (info)->data_index_section;
6559 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6561 const struct elf_backend_data *bed;
6563 if (!is_elf_hash_table (info->hash))
6566 bed = get_elf_backend_data (output_bfd);
6567 (*bed->elf_backend_init_index_section) (output_bfd, info);
6569 if (elf_hash_table (info)->dynamic_sections_created)
6573 bfd_size_type dynsymcount;
6574 unsigned long section_sym_count;
6575 unsigned int dtagcount;
6577 dynobj = elf_hash_table (info)->dynobj;
6579 /* Assign dynsym indicies. In a shared library we generate a
6580 section symbol for each output section, which come first.
6581 Next come all of the back-end allocated local dynamic syms,
6582 followed by the rest of the global symbols. */
6584 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6585 §ion_sym_count);
6587 /* Work out the size of the symbol version section. */
6588 s = bfd_get_linker_section (dynobj, ".gnu.version");
6589 BFD_ASSERT (s != NULL);
6590 if (dynsymcount != 0
6591 && (s->flags & SEC_EXCLUDE) == 0)
6593 s->size = dynsymcount * sizeof (Elf_External_Versym);
6594 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6595 if (s->contents == NULL)
6598 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6602 /* Set the size of the .dynsym and .hash sections. We counted
6603 the number of dynamic symbols in elf_link_add_object_symbols.
6604 We will build the contents of .dynsym and .hash when we build
6605 the final symbol table, because until then we do not know the
6606 correct value to give the symbols. We built the .dynstr
6607 section as we went along in elf_link_add_object_symbols. */
6608 s = elf_hash_table (info)->dynsym;
6609 BFD_ASSERT (s != NULL);
6610 s->size = dynsymcount * bed->s->sizeof_sym;
6612 if (dynsymcount != 0)
6614 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6615 if (s->contents == NULL)
6618 /* The first entry in .dynsym is a dummy symbol.
6619 Clear all the section syms, in case we don't output them all. */
6620 ++section_sym_count;
6621 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6624 elf_hash_table (info)->bucketcount = 0;
6626 /* Compute the size of the hashing table. As a side effect this
6627 computes the hash values for all the names we export. */
6628 if (info->emit_hash)
6630 unsigned long int *hashcodes;
6631 struct hash_codes_info hashinf;
6633 unsigned long int nsyms;
6635 size_t hash_entry_size;
6637 /* Compute the hash values for all exported symbols. At the same
6638 time store the values in an array so that we could use them for
6640 amt = dynsymcount * sizeof (unsigned long int);
6641 hashcodes = (unsigned long int *) bfd_malloc (amt);
6642 if (hashcodes == NULL)
6644 hashinf.hashcodes = hashcodes;
6645 hashinf.error = FALSE;
6647 /* Put all hash values in HASHCODES. */
6648 elf_link_hash_traverse (elf_hash_table (info),
6649 elf_collect_hash_codes, &hashinf);
6656 nsyms = hashinf.hashcodes - hashcodes;
6658 = compute_bucket_count (info, hashcodes, nsyms, 0);
6661 if (bucketcount == 0)
6664 elf_hash_table (info)->bucketcount = bucketcount;
6666 s = bfd_get_linker_section (dynobj, ".hash");
6667 BFD_ASSERT (s != NULL);
6668 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6669 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6670 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6671 if (s->contents == NULL)
6674 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6675 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6676 s->contents + hash_entry_size);
6679 if (info->emit_gnu_hash)
6682 unsigned char *contents;
6683 struct collect_gnu_hash_codes cinfo;
6687 memset (&cinfo, 0, sizeof (cinfo));
6689 /* Compute the hash values for all exported symbols. At the same
6690 time store the values in an array so that we could use them for
6692 amt = dynsymcount * 2 * sizeof (unsigned long int);
6693 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6694 if (cinfo.hashcodes == NULL)
6697 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6698 cinfo.min_dynindx = -1;
6699 cinfo.output_bfd = output_bfd;
6702 /* Put all hash values in HASHCODES. */
6703 elf_link_hash_traverse (elf_hash_table (info),
6704 elf_collect_gnu_hash_codes, &cinfo);
6707 free (cinfo.hashcodes);
6712 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6714 if (bucketcount == 0)
6716 free (cinfo.hashcodes);
6720 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6721 BFD_ASSERT (s != NULL);
6723 if (cinfo.nsyms == 0)
6725 /* Empty .gnu.hash section is special. */
6726 BFD_ASSERT (cinfo.min_dynindx == -1);
6727 free (cinfo.hashcodes);
6728 s->size = 5 * 4 + bed->s->arch_size / 8;
6729 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6730 if (contents == NULL)
6732 s->contents = contents;
6733 /* 1 empty bucket. */
6734 bfd_put_32 (output_bfd, 1, contents);
6735 /* SYMIDX above the special symbol 0. */
6736 bfd_put_32 (output_bfd, 1, contents + 4);
6737 /* Just one word for bitmask. */
6738 bfd_put_32 (output_bfd, 1, contents + 8);
6739 /* Only hash fn bloom filter. */
6740 bfd_put_32 (output_bfd, 0, contents + 12);
6741 /* No hashes are valid - empty bitmask. */
6742 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6743 /* No hashes in the only bucket. */
6744 bfd_put_32 (output_bfd, 0,
6745 contents + 16 + bed->s->arch_size / 8);
6749 unsigned long int maskwords, maskbitslog2, x;
6750 BFD_ASSERT (cinfo.min_dynindx != -1);
6754 while ((x >>= 1) != 0)
6756 if (maskbitslog2 < 3)
6758 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6759 maskbitslog2 = maskbitslog2 + 3;
6761 maskbitslog2 = maskbitslog2 + 2;
6762 if (bed->s->arch_size == 64)
6764 if (maskbitslog2 == 5)
6770 cinfo.mask = (1 << cinfo.shift1) - 1;
6771 cinfo.shift2 = maskbitslog2;
6772 cinfo.maskbits = 1 << maskbitslog2;
6773 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6774 amt = bucketcount * sizeof (unsigned long int) * 2;
6775 amt += maskwords * sizeof (bfd_vma);
6776 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6777 if (cinfo.bitmask == NULL)
6779 free (cinfo.hashcodes);
6783 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6784 cinfo.indx = cinfo.counts + bucketcount;
6785 cinfo.symindx = dynsymcount - cinfo.nsyms;
6786 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6788 /* Determine how often each hash bucket is used. */
6789 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6790 for (i = 0; i < cinfo.nsyms; ++i)
6791 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6793 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6794 if (cinfo.counts[i] != 0)
6796 cinfo.indx[i] = cnt;
6797 cnt += cinfo.counts[i];
6799 BFD_ASSERT (cnt == dynsymcount);
6800 cinfo.bucketcount = bucketcount;
6801 cinfo.local_indx = cinfo.min_dynindx;
6803 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6804 s->size += cinfo.maskbits / 8;
6805 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6806 if (contents == NULL)
6808 free (cinfo.bitmask);
6809 free (cinfo.hashcodes);
6813 s->contents = contents;
6814 bfd_put_32 (output_bfd, bucketcount, contents);
6815 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6816 bfd_put_32 (output_bfd, maskwords, contents + 8);
6817 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6818 contents += 16 + cinfo.maskbits / 8;
6820 for (i = 0; i < bucketcount; ++i)
6822 if (cinfo.counts[i] == 0)
6823 bfd_put_32 (output_bfd, 0, contents);
6825 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6829 cinfo.contents = contents;
6831 /* Renumber dynamic symbols, populate .gnu.hash section. */
6832 elf_link_hash_traverse (elf_hash_table (info),
6833 elf_renumber_gnu_hash_syms, &cinfo);
6835 contents = s->contents + 16;
6836 for (i = 0; i < maskwords; ++i)
6838 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6840 contents += bed->s->arch_size / 8;
6843 free (cinfo.bitmask);
6844 free (cinfo.hashcodes);
6848 s = bfd_get_linker_section (dynobj, ".dynstr");
6849 BFD_ASSERT (s != NULL);
6851 elf_finalize_dynstr (output_bfd, info);
6853 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6855 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6856 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6863 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6866 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6869 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6870 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6873 /* Finish SHF_MERGE section merging. */
6876 _bfd_elf_merge_sections (bfd *obfd, struct bfd_link_info *info)
6881 if (!is_elf_hash_table (info->hash))
6884 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6885 if ((ibfd->flags & DYNAMIC) == 0
6886 && bfd_get_flavour (ibfd) == bfd_target_elf_flavour
6887 && (elf_elfheader (ibfd)->e_ident[EI_CLASS]
6888 == get_elf_backend_data (obfd)->s->elfclass))
6889 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6890 if ((sec->flags & SEC_MERGE) != 0
6891 && !bfd_is_abs_section (sec->output_section))
6893 struct bfd_elf_section_data *secdata;
6895 secdata = elf_section_data (sec);
6896 if (! _bfd_add_merge_section (obfd,
6897 &elf_hash_table (info)->merge_info,
6898 sec, &secdata->sec_info))
6900 else if (secdata->sec_info)
6901 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6904 if (elf_hash_table (info)->merge_info != NULL)
6905 _bfd_merge_sections (obfd, info, elf_hash_table (info)->merge_info,
6906 merge_sections_remove_hook);
6910 /* Create an entry in an ELF linker hash table. */
6912 struct bfd_hash_entry *
6913 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6914 struct bfd_hash_table *table,
6917 /* Allocate the structure if it has not already been allocated by a
6921 entry = (struct bfd_hash_entry *)
6922 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6927 /* Call the allocation method of the superclass. */
6928 entry = _bfd_link_hash_newfunc (entry, table, string);
6931 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6932 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6934 /* Set local fields. */
6937 ret->got = htab->init_got_refcount;
6938 ret->plt = htab->init_plt_refcount;
6939 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6940 - offsetof (struct elf_link_hash_entry, size)));
6941 /* Assume that we have been called by a non-ELF symbol reader.
6942 This flag is then reset by the code which reads an ELF input
6943 file. This ensures that a symbol created by a non-ELF symbol
6944 reader will have the flag set correctly. */
6951 /* Copy data from an indirect symbol to its direct symbol, hiding the
6952 old indirect symbol. Also used for copying flags to a weakdef. */
6955 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6956 struct elf_link_hash_entry *dir,
6957 struct elf_link_hash_entry *ind)
6959 struct elf_link_hash_table *htab;
6961 /* Copy down any references that we may have already seen to the
6962 symbol which just became indirect if DIR isn't a hidden versioned
6965 if (dir->versioned != versioned_hidden)
6967 dir->ref_dynamic |= ind->ref_dynamic;
6968 dir->ref_regular |= ind->ref_regular;
6969 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6970 dir->non_got_ref |= ind->non_got_ref;
6971 dir->needs_plt |= ind->needs_plt;
6972 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6975 if (ind->root.type != bfd_link_hash_indirect)
6978 /* Copy over the global and procedure linkage table refcount entries.
6979 These may have been already set up by a check_relocs routine. */
6980 htab = elf_hash_table (info);
6981 if (ind->got.refcount > htab->init_got_refcount.refcount)
6983 if (dir->got.refcount < 0)
6984 dir->got.refcount = 0;
6985 dir->got.refcount += ind->got.refcount;
6986 ind->got.refcount = htab->init_got_refcount.refcount;
6989 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6991 if (dir->plt.refcount < 0)
6992 dir->plt.refcount = 0;
6993 dir->plt.refcount += ind->plt.refcount;
6994 ind->plt.refcount = htab->init_plt_refcount.refcount;
6997 if (ind->dynindx != -1)
6999 if (dir->dynindx != -1)
7000 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
7001 dir->dynindx = ind->dynindx;
7002 dir->dynstr_index = ind->dynstr_index;
7004 ind->dynstr_index = 0;
7009 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
7010 struct elf_link_hash_entry *h,
7011 bfd_boolean force_local)
7013 /* STT_GNU_IFUNC symbol must go through PLT. */
7014 if (h->type != STT_GNU_IFUNC)
7016 h->plt = elf_hash_table (info)->init_plt_offset;
7021 h->forced_local = 1;
7022 if (h->dynindx != -1)
7025 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
7031 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7035 _bfd_elf_link_hash_table_init
7036 (struct elf_link_hash_table *table,
7038 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
7039 struct bfd_hash_table *,
7041 unsigned int entsize,
7042 enum elf_target_id target_id)
7045 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
7047 table->init_got_refcount.refcount = can_refcount - 1;
7048 table->init_plt_refcount.refcount = can_refcount - 1;
7049 table->init_got_offset.offset = -(bfd_vma) 1;
7050 table->init_plt_offset.offset = -(bfd_vma) 1;
7051 /* The first dynamic symbol is a dummy. */
7052 table->dynsymcount = 1;
7054 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
7056 table->root.type = bfd_link_elf_hash_table;
7057 table->hash_table_id = target_id;
7062 /* Create an ELF linker hash table. */
7064 struct bfd_link_hash_table *
7065 _bfd_elf_link_hash_table_create (bfd *abfd)
7067 struct elf_link_hash_table *ret;
7068 bfd_size_type amt = sizeof (struct elf_link_hash_table);
7070 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
7074 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
7075 sizeof (struct elf_link_hash_entry),
7081 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
7086 /* Destroy an ELF linker hash table. */
7089 _bfd_elf_link_hash_table_free (bfd *obfd)
7091 struct elf_link_hash_table *htab;
7093 htab = (struct elf_link_hash_table *) obfd->link.hash;
7094 if (htab->dynstr != NULL)
7095 _bfd_elf_strtab_free (htab->dynstr);
7096 _bfd_merge_sections_free (htab->merge_info);
7097 _bfd_generic_link_hash_table_free (obfd);
7100 /* This is a hook for the ELF emulation code in the generic linker to
7101 tell the backend linker what file name to use for the DT_NEEDED
7102 entry for a dynamic object. */
7105 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
7107 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7108 && bfd_get_format (abfd) == bfd_object)
7109 elf_dt_name (abfd) = name;
7113 bfd_elf_get_dyn_lib_class (bfd *abfd)
7116 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7117 && bfd_get_format (abfd) == bfd_object)
7118 lib_class = elf_dyn_lib_class (abfd);
7125 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
7127 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7128 && bfd_get_format (abfd) == bfd_object)
7129 elf_dyn_lib_class (abfd) = lib_class;
7132 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7133 the linker ELF emulation code. */
7135 struct bfd_link_needed_list *
7136 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
7137 struct bfd_link_info *info)
7139 if (! is_elf_hash_table (info->hash))
7141 return elf_hash_table (info)->needed;
7144 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7145 hook for the linker ELF emulation code. */
7147 struct bfd_link_needed_list *
7148 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
7149 struct bfd_link_info *info)
7151 if (! is_elf_hash_table (info->hash))
7153 return elf_hash_table (info)->runpath;
7156 /* Get the name actually used for a dynamic object for a link. This
7157 is the SONAME entry if there is one. Otherwise, it is the string
7158 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7161 bfd_elf_get_dt_soname (bfd *abfd)
7163 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7164 && bfd_get_format (abfd) == bfd_object)
7165 return elf_dt_name (abfd);
7169 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7170 the ELF linker emulation code. */
7173 bfd_elf_get_bfd_needed_list (bfd *abfd,
7174 struct bfd_link_needed_list **pneeded)
7177 bfd_byte *dynbuf = NULL;
7178 unsigned int elfsec;
7179 unsigned long shlink;
7180 bfd_byte *extdyn, *extdynend;
7182 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
7186 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
7187 || bfd_get_format (abfd) != bfd_object)
7190 s = bfd_get_section_by_name (abfd, ".dynamic");
7191 if (s == NULL || s->size == 0)
7194 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
7197 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
7198 if (elfsec == SHN_BAD)
7201 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
7203 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
7204 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
7207 extdynend = extdyn + s->size;
7208 for (; extdyn < extdynend; extdyn += extdynsize)
7210 Elf_Internal_Dyn dyn;
7212 (*swap_dyn_in) (abfd, extdyn, &dyn);
7214 if (dyn.d_tag == DT_NULL)
7217 if (dyn.d_tag == DT_NEEDED)
7220 struct bfd_link_needed_list *l;
7221 unsigned int tagv = dyn.d_un.d_val;
7224 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7229 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7250 struct elf_symbuf_symbol
7252 unsigned long st_name; /* Symbol name, index in string tbl */
7253 unsigned char st_info; /* Type and binding attributes */
7254 unsigned char st_other; /* Visibilty, and target specific */
7257 struct elf_symbuf_head
7259 struct elf_symbuf_symbol *ssym;
7260 bfd_size_type count;
7261 unsigned int st_shndx;
7268 Elf_Internal_Sym *isym;
7269 struct elf_symbuf_symbol *ssym;
7274 /* Sort references to symbols by ascending section number. */
7277 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7279 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7280 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7282 return s1->st_shndx - s2->st_shndx;
7286 elf_sym_name_compare (const void *arg1, const void *arg2)
7288 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7289 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7290 return strcmp (s1->name, s2->name);
7293 static struct elf_symbuf_head *
7294 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7296 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7297 struct elf_symbuf_symbol *ssym;
7298 struct elf_symbuf_head *ssymbuf, *ssymhead;
7299 bfd_size_type i, shndx_count, total_size;
7301 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7305 for (ind = indbuf, i = 0; i < symcount; i++)
7306 if (isymbuf[i].st_shndx != SHN_UNDEF)
7307 *ind++ = &isymbuf[i];
7310 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7311 elf_sort_elf_symbol);
7314 if (indbufend > indbuf)
7315 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7316 if (ind[0]->st_shndx != ind[1]->st_shndx)
7319 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7320 + (indbufend - indbuf) * sizeof (*ssym));
7321 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7322 if (ssymbuf == NULL)
7328 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7329 ssymbuf->ssym = NULL;
7330 ssymbuf->count = shndx_count;
7331 ssymbuf->st_shndx = 0;
7332 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7334 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7337 ssymhead->ssym = ssym;
7338 ssymhead->count = 0;
7339 ssymhead->st_shndx = (*ind)->st_shndx;
7341 ssym->st_name = (*ind)->st_name;
7342 ssym->st_info = (*ind)->st_info;
7343 ssym->st_other = (*ind)->st_other;
7346 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7347 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7354 /* Check if 2 sections define the same set of local and global
7358 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7359 struct bfd_link_info *info)
7362 const struct elf_backend_data *bed1, *bed2;
7363 Elf_Internal_Shdr *hdr1, *hdr2;
7364 bfd_size_type symcount1, symcount2;
7365 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7366 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7367 Elf_Internal_Sym *isym, *isymend;
7368 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7369 bfd_size_type count1, count2, i;
7370 unsigned int shndx1, shndx2;
7376 /* Both sections have to be in ELF. */
7377 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7378 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7381 if (elf_section_type (sec1) != elf_section_type (sec2))
7384 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7385 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7386 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7389 bed1 = get_elf_backend_data (bfd1);
7390 bed2 = get_elf_backend_data (bfd2);
7391 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7392 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7393 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7394 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7396 if (symcount1 == 0 || symcount2 == 0)
7402 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7403 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7405 if (ssymbuf1 == NULL)
7407 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7409 if (isymbuf1 == NULL)
7412 if (!info->reduce_memory_overheads)
7413 elf_tdata (bfd1)->symbuf = ssymbuf1
7414 = elf_create_symbuf (symcount1, isymbuf1);
7417 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7419 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7421 if (isymbuf2 == NULL)
7424 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7425 elf_tdata (bfd2)->symbuf = ssymbuf2
7426 = elf_create_symbuf (symcount2, isymbuf2);
7429 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7431 /* Optimized faster version. */
7432 bfd_size_type lo, hi, mid;
7433 struct elf_symbol *symp;
7434 struct elf_symbuf_symbol *ssym, *ssymend;
7437 hi = ssymbuf1->count;
7442 mid = (lo + hi) / 2;
7443 if (shndx1 < ssymbuf1[mid].st_shndx)
7445 else if (shndx1 > ssymbuf1[mid].st_shndx)
7449 count1 = ssymbuf1[mid].count;
7456 hi = ssymbuf2->count;
7461 mid = (lo + hi) / 2;
7462 if (shndx2 < ssymbuf2[mid].st_shndx)
7464 else if (shndx2 > ssymbuf2[mid].st_shndx)
7468 count2 = ssymbuf2[mid].count;
7474 if (count1 == 0 || count2 == 0 || count1 != count2)
7478 = (struct elf_symbol *) bfd_malloc (count1 * sizeof (*symtable1));
7480 = (struct elf_symbol *) bfd_malloc (count2 * sizeof (*symtable2));
7481 if (symtable1 == NULL || symtable2 == NULL)
7485 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7486 ssym < ssymend; ssym++, symp++)
7488 symp->u.ssym = ssym;
7489 symp->name = bfd_elf_string_from_elf_section (bfd1,
7495 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7496 ssym < ssymend; ssym++, symp++)
7498 symp->u.ssym = ssym;
7499 symp->name = bfd_elf_string_from_elf_section (bfd2,
7504 /* Sort symbol by name. */
7505 qsort (symtable1, count1, sizeof (struct elf_symbol),
7506 elf_sym_name_compare);
7507 qsort (symtable2, count1, sizeof (struct elf_symbol),
7508 elf_sym_name_compare);
7510 for (i = 0; i < count1; i++)
7511 /* Two symbols must have the same binding, type and name. */
7512 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7513 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7514 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7521 symtable1 = (struct elf_symbol *)
7522 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7523 symtable2 = (struct elf_symbol *)
7524 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7525 if (symtable1 == NULL || symtable2 == NULL)
7528 /* Count definitions in the section. */
7530 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7531 if (isym->st_shndx == shndx1)
7532 symtable1[count1++].u.isym = isym;
7535 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7536 if (isym->st_shndx == shndx2)
7537 symtable2[count2++].u.isym = isym;
7539 if (count1 == 0 || count2 == 0 || count1 != count2)
7542 for (i = 0; i < count1; i++)
7544 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7545 symtable1[i].u.isym->st_name);
7547 for (i = 0; i < count2; i++)
7549 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7550 symtable2[i].u.isym->st_name);
7552 /* Sort symbol by name. */
7553 qsort (symtable1, count1, sizeof (struct elf_symbol),
7554 elf_sym_name_compare);
7555 qsort (symtable2, count1, sizeof (struct elf_symbol),
7556 elf_sym_name_compare);
7558 for (i = 0; i < count1; i++)
7559 /* Two symbols must have the same binding, type and name. */
7560 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7561 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7562 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7580 /* Return TRUE if 2 section types are compatible. */
7583 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7584 bfd *bbfd, const asection *bsec)
7588 || abfd->xvec->flavour != bfd_target_elf_flavour
7589 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7592 return elf_section_type (asec) == elf_section_type (bsec);
7595 /* Final phase of ELF linker. */
7597 /* A structure we use to avoid passing large numbers of arguments. */
7599 struct elf_final_link_info
7601 /* General link information. */
7602 struct bfd_link_info *info;
7605 /* Symbol string table. */
7606 struct elf_strtab_hash *symstrtab;
7607 /* .hash section. */
7609 /* symbol version section (.gnu.version). */
7610 asection *symver_sec;
7611 /* Buffer large enough to hold contents of any section. */
7613 /* Buffer large enough to hold external relocs of any section. */
7614 void *external_relocs;
7615 /* Buffer large enough to hold internal relocs of any section. */
7616 Elf_Internal_Rela *internal_relocs;
7617 /* Buffer large enough to hold external local symbols of any input
7619 bfd_byte *external_syms;
7620 /* And a buffer for symbol section indices. */
7621 Elf_External_Sym_Shndx *locsym_shndx;
7622 /* Buffer large enough to hold internal local symbols of any input
7624 Elf_Internal_Sym *internal_syms;
7625 /* Array large enough to hold a symbol index for each local symbol
7626 of any input BFD. */
7628 /* Array large enough to hold a section pointer for each local
7629 symbol of any input BFD. */
7630 asection **sections;
7631 /* Buffer for SHT_SYMTAB_SHNDX section. */
7632 Elf_External_Sym_Shndx *symshndxbuf;
7633 /* Number of STT_FILE syms seen. */
7634 size_t filesym_count;
7637 /* This struct is used to pass information to elf_link_output_extsym. */
7639 struct elf_outext_info
7642 bfd_boolean localsyms;
7643 bfd_boolean file_sym_done;
7644 struct elf_final_link_info *flinfo;
7648 /* Support for evaluating a complex relocation.
7650 Complex relocations are generalized, self-describing relocations. The
7651 implementation of them consists of two parts: complex symbols, and the
7652 relocations themselves.
7654 The relocations are use a reserved elf-wide relocation type code (R_RELC
7655 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7656 information (start bit, end bit, word width, etc) into the addend. This
7657 information is extracted from CGEN-generated operand tables within gas.
7659 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7660 internal) representing prefix-notation expressions, including but not
7661 limited to those sorts of expressions normally encoded as addends in the
7662 addend field. The symbol mangling format is:
7665 | <unary-operator> ':' <node>
7666 | <binary-operator> ':' <node> ':' <node>
7669 <literal> := 's' <digits=N> ':' <N character symbol name>
7670 | 'S' <digits=N> ':' <N character section name>
7674 <binary-operator> := as in C
7675 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7678 set_symbol_value (bfd *bfd_with_globals,
7679 Elf_Internal_Sym *isymbuf,
7684 struct elf_link_hash_entry **sym_hashes;
7685 struct elf_link_hash_entry *h;
7686 size_t extsymoff = locsymcount;
7688 if (symidx < locsymcount)
7690 Elf_Internal_Sym *sym;
7692 sym = isymbuf + symidx;
7693 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7695 /* It is a local symbol: move it to the
7696 "absolute" section and give it a value. */
7697 sym->st_shndx = SHN_ABS;
7698 sym->st_value = val;
7701 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7705 /* It is a global symbol: set its link type
7706 to "defined" and give it a value. */
7708 sym_hashes = elf_sym_hashes (bfd_with_globals);
7709 h = sym_hashes [symidx - extsymoff];
7710 while (h->root.type == bfd_link_hash_indirect
7711 || h->root.type == bfd_link_hash_warning)
7712 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7713 h->root.type = bfd_link_hash_defined;
7714 h->root.u.def.value = val;
7715 h->root.u.def.section = bfd_abs_section_ptr;
7719 resolve_symbol (const char *name,
7721 struct elf_final_link_info *flinfo,
7723 Elf_Internal_Sym *isymbuf,
7726 Elf_Internal_Sym *sym;
7727 struct bfd_link_hash_entry *global_entry;
7728 const char *candidate = NULL;
7729 Elf_Internal_Shdr *symtab_hdr;
7732 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7734 for (i = 0; i < locsymcount; ++ i)
7738 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7741 candidate = bfd_elf_string_from_elf_section (input_bfd,
7742 symtab_hdr->sh_link,
7745 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7746 name, candidate, (unsigned long) sym->st_value);
7748 if (candidate && strcmp (candidate, name) == 0)
7750 asection *sec = flinfo->sections [i];
7752 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7753 *result += sec->output_offset + sec->output_section->vma;
7755 printf ("Found symbol with value %8.8lx\n",
7756 (unsigned long) *result);
7762 /* Hmm, haven't found it yet. perhaps it is a global. */
7763 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7764 FALSE, FALSE, TRUE);
7768 if (global_entry->type == bfd_link_hash_defined
7769 || global_entry->type == bfd_link_hash_defweak)
7771 *result = (global_entry->u.def.value
7772 + global_entry->u.def.section->output_section->vma
7773 + global_entry->u.def.section->output_offset);
7775 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7776 global_entry->root.string, (unsigned long) *result);
7784 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
7785 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
7786 names like "foo.end" which is the end address of section "foo". */
7789 resolve_section (const char *name,
7797 for (curr = sections; curr; curr = curr->next)
7798 if (strcmp (curr->name, name) == 0)
7800 *result = curr->vma;
7804 /* Hmm. still haven't found it. try pseudo-section names. */
7805 /* FIXME: This could be coded more efficiently... */
7806 for (curr = sections; curr; curr = curr->next)
7808 len = strlen (curr->name);
7809 if (len > strlen (name))
7812 if (strncmp (curr->name, name, len) == 0)
7814 if (strncmp (".end", name + len, 4) == 0)
7816 *result = curr->vma + curr->size / bfd_octets_per_byte (abfd);
7820 /* Insert more pseudo-section names here, if you like. */
7828 undefined_reference (const char *reftype, const char *name)
7830 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7835 eval_symbol (bfd_vma *result,
7838 struct elf_final_link_info *flinfo,
7840 Elf_Internal_Sym *isymbuf,
7849 const char *sym = *symp;
7851 bfd_boolean symbol_is_section = FALSE;
7856 if (len < 1 || len > sizeof (symbuf))
7858 bfd_set_error (bfd_error_invalid_operation);
7871 *result = strtoul (sym, (char **) symp, 16);
7875 symbol_is_section = TRUE;
7878 symlen = strtol (sym, (char **) symp, 10);
7879 sym = *symp + 1; /* Skip the trailing ':'. */
7881 if (symend < sym || symlen + 1 > sizeof (symbuf))
7883 bfd_set_error (bfd_error_invalid_operation);
7887 memcpy (symbuf, sym, symlen);
7888 symbuf[symlen] = '\0';
7889 *symp = sym + symlen;
7891 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7892 the symbol as a section, or vice-versa. so we're pretty liberal in our
7893 interpretation here; section means "try section first", not "must be a
7894 section", and likewise with symbol. */
7896 if (symbol_is_section)
7898 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result, input_bfd)
7899 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7900 isymbuf, locsymcount))
7902 undefined_reference ("section", symbuf);
7908 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7909 isymbuf, locsymcount)
7910 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7913 undefined_reference ("symbol", symbuf);
7920 /* All that remains are operators. */
7922 #define UNARY_OP(op) \
7923 if (strncmp (sym, #op, strlen (#op)) == 0) \
7925 sym += strlen (#op); \
7929 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7930 isymbuf, locsymcount, signed_p)) \
7933 *result = op ((bfd_signed_vma) a); \
7939 #define BINARY_OP(op) \
7940 if (strncmp (sym, #op, strlen (#op)) == 0) \
7942 sym += strlen (#op); \
7946 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7947 isymbuf, locsymcount, signed_p)) \
7950 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7951 isymbuf, locsymcount, signed_p)) \
7954 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7984 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7985 bfd_set_error (bfd_error_invalid_operation);
7991 put_value (bfd_vma size,
7992 unsigned long chunksz,
7997 location += (size - chunksz);
7999 for (; size; size -= chunksz, location -= chunksz)
8004 bfd_put_8 (input_bfd, x, location);
8008 bfd_put_16 (input_bfd, x, location);
8012 bfd_put_32 (input_bfd, x, location);
8013 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8019 bfd_put_64 (input_bfd, x, location);
8020 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8033 get_value (bfd_vma size,
8034 unsigned long chunksz,
8041 /* Sanity checks. */
8042 BFD_ASSERT (chunksz <= sizeof (x)
8045 && (size % chunksz) == 0
8046 && input_bfd != NULL
8047 && location != NULL);
8049 if (chunksz == sizeof (x))
8051 BFD_ASSERT (size == chunksz);
8053 /* Make sure that we do not perform an undefined shift operation.
8054 We know that size == chunksz so there will only be one iteration
8055 of the loop below. */
8059 shift = 8 * chunksz;
8061 for (; size; size -= chunksz, location += chunksz)
8066 x = (x << shift) | bfd_get_8 (input_bfd, location);
8069 x = (x << shift) | bfd_get_16 (input_bfd, location);
8072 x = (x << shift) | bfd_get_32 (input_bfd, location);
8076 x = (x << shift) | bfd_get_64 (input_bfd, location);
8087 decode_complex_addend (unsigned long *start, /* in bits */
8088 unsigned long *oplen, /* in bits */
8089 unsigned long *len, /* in bits */
8090 unsigned long *wordsz, /* in bytes */
8091 unsigned long *chunksz, /* in bytes */
8092 unsigned long *lsb0_p,
8093 unsigned long *signed_p,
8094 unsigned long *trunc_p,
8095 unsigned long encoded)
8097 * start = encoded & 0x3F;
8098 * len = (encoded >> 6) & 0x3F;
8099 * oplen = (encoded >> 12) & 0x3F;
8100 * wordsz = (encoded >> 18) & 0xF;
8101 * chunksz = (encoded >> 22) & 0xF;
8102 * lsb0_p = (encoded >> 27) & 1;
8103 * signed_p = (encoded >> 28) & 1;
8104 * trunc_p = (encoded >> 29) & 1;
8107 bfd_reloc_status_type
8108 bfd_elf_perform_complex_relocation (bfd *input_bfd,
8109 asection *input_section ATTRIBUTE_UNUSED,
8111 Elf_Internal_Rela *rel,
8114 bfd_vma shift, x, mask;
8115 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
8116 bfd_reloc_status_type r;
8118 /* Perform this reloc, since it is complex.
8119 (this is not to say that it necessarily refers to a complex
8120 symbol; merely that it is a self-describing CGEN based reloc.
8121 i.e. the addend has the complete reloc information (bit start, end,
8122 word size, etc) encoded within it.). */
8124 decode_complex_addend (&start, &oplen, &len, &wordsz,
8125 &chunksz, &lsb0_p, &signed_p,
8126 &trunc_p, rel->r_addend);
8128 mask = (((1L << (len - 1)) - 1) << 1) | 1;
8131 shift = (start + 1) - len;
8133 shift = (8 * wordsz) - (start + len);
8135 x = get_value (wordsz, chunksz, input_bfd,
8136 contents + rel->r_offset * bfd_octets_per_byte (input_bfd));
8139 printf ("Doing complex reloc: "
8140 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8141 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8142 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8143 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
8144 oplen, (unsigned long) x, (unsigned long) mask,
8145 (unsigned long) relocation);
8150 /* Now do an overflow check. */
8151 r = bfd_check_overflow ((signed_p
8152 ? complain_overflow_signed
8153 : complain_overflow_unsigned),
8154 len, 0, (8 * wordsz),
8158 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
8161 printf (" relocation: %8.8lx\n"
8162 " shifted mask: %8.8lx\n"
8163 " shifted/masked reloc: %8.8lx\n"
8164 " result: %8.8lx\n",
8165 (unsigned long) relocation, (unsigned long) (mask << shift),
8166 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
8168 put_value (wordsz, chunksz, input_bfd, x,
8169 contents + rel->r_offset * bfd_octets_per_byte (input_bfd));
8173 /* Functions to read r_offset from external (target order) reloc
8174 entry. Faster than bfd_getl32 et al, because we let the compiler
8175 know the value is aligned. */
8178 ext32l_r_offset (const void *p)
8185 const union aligned32 *a
8186 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8188 uint32_t aval = ( (uint32_t) a->c[0]
8189 | (uint32_t) a->c[1] << 8
8190 | (uint32_t) a->c[2] << 16
8191 | (uint32_t) a->c[3] << 24);
8196 ext32b_r_offset (const void *p)
8203 const union aligned32 *a
8204 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8206 uint32_t aval = ( (uint32_t) a->c[0] << 24
8207 | (uint32_t) a->c[1] << 16
8208 | (uint32_t) a->c[2] << 8
8209 | (uint32_t) a->c[3]);
8213 #ifdef BFD_HOST_64_BIT
8215 ext64l_r_offset (const void *p)
8222 const union aligned64 *a
8223 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8225 uint64_t aval = ( (uint64_t) a->c[0]
8226 | (uint64_t) a->c[1] << 8
8227 | (uint64_t) a->c[2] << 16
8228 | (uint64_t) a->c[3] << 24
8229 | (uint64_t) a->c[4] << 32
8230 | (uint64_t) a->c[5] << 40
8231 | (uint64_t) a->c[6] << 48
8232 | (uint64_t) a->c[7] << 56);
8237 ext64b_r_offset (const void *p)
8244 const union aligned64 *a
8245 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8247 uint64_t aval = ( (uint64_t) a->c[0] << 56
8248 | (uint64_t) a->c[1] << 48
8249 | (uint64_t) a->c[2] << 40
8250 | (uint64_t) a->c[3] << 32
8251 | (uint64_t) a->c[4] << 24
8252 | (uint64_t) a->c[5] << 16
8253 | (uint64_t) a->c[6] << 8
8254 | (uint64_t) a->c[7]);
8259 /* When performing a relocatable link, the input relocations are
8260 preserved. But, if they reference global symbols, the indices
8261 referenced must be updated. Update all the relocations found in
8265 elf_link_adjust_relocs (bfd *abfd,
8266 struct bfd_elf_section_reloc_data *reldata,
8270 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8272 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8273 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8274 bfd_vma r_type_mask;
8276 unsigned int count = reldata->count;
8277 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8279 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8281 swap_in = bed->s->swap_reloc_in;
8282 swap_out = bed->s->swap_reloc_out;
8284 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8286 swap_in = bed->s->swap_reloca_in;
8287 swap_out = bed->s->swap_reloca_out;
8292 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8295 if (bed->s->arch_size == 32)
8302 r_type_mask = 0xffffffff;
8306 erela = reldata->hdr->contents;
8307 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8309 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8312 if (*rel_hash == NULL)
8315 BFD_ASSERT ((*rel_hash)->indx >= 0);
8317 (*swap_in) (abfd, erela, irela);
8318 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8319 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8320 | (irela[j].r_info & r_type_mask));
8321 (*swap_out) (abfd, irela, erela);
8324 if (sort && count != 0)
8326 bfd_vma (*ext_r_off) (const void *);
8329 bfd_byte *base, *end, *p, *loc;
8330 bfd_byte *buf = NULL;
8332 if (bed->s->arch_size == 32)
8334 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8335 ext_r_off = ext32l_r_offset;
8336 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8337 ext_r_off = ext32b_r_offset;
8343 #ifdef BFD_HOST_64_BIT
8344 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8345 ext_r_off = ext64l_r_offset;
8346 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8347 ext_r_off = ext64b_r_offset;
8353 /* Must use a stable sort here. A modified insertion sort,
8354 since the relocs are mostly sorted already. */
8355 elt_size = reldata->hdr->sh_entsize;
8356 base = reldata->hdr->contents;
8357 end = base + count * elt_size;
8358 if (elt_size > sizeof (Elf64_External_Rela))
8361 /* Ensure the first element is lowest. This acts as a sentinel,
8362 speeding the main loop below. */
8363 r_off = (*ext_r_off) (base);
8364 for (p = loc = base; (p += elt_size) < end; )
8366 bfd_vma r_off2 = (*ext_r_off) (p);
8375 /* Don't just swap *base and *loc as that changes the order
8376 of the original base[0] and base[1] if they happen to
8377 have the same r_offset. */
8378 bfd_byte onebuf[sizeof (Elf64_External_Rela)];
8379 memcpy (onebuf, loc, elt_size);
8380 memmove (base + elt_size, base, loc - base);
8381 memcpy (base, onebuf, elt_size);
8384 for (p = base + elt_size; (p += elt_size) < end; )
8386 /* base to p is sorted, *p is next to insert. */
8387 r_off = (*ext_r_off) (p);
8388 /* Search the sorted region for location to insert. */
8390 while (r_off < (*ext_r_off) (loc))
8395 /* Chances are there is a run of relocs to insert here,
8396 from one of more input files. Files are not always
8397 linked in order due to the way elf_link_input_bfd is
8398 called. See pr17666. */
8399 size_t sortlen = p - loc;
8400 bfd_vma r_off2 = (*ext_r_off) (loc);
8401 size_t runlen = elt_size;
8402 size_t buf_size = 96 * 1024;
8403 while (p + runlen < end
8404 && (sortlen <= buf_size
8405 || runlen + elt_size <= buf_size)
8406 && r_off2 > (*ext_r_off) (p + runlen))
8410 buf = bfd_malloc (buf_size);
8414 if (runlen < sortlen)
8416 memcpy (buf, p, runlen);
8417 memmove (loc + runlen, loc, sortlen);
8418 memcpy (loc, buf, runlen);
8422 memcpy (buf, loc, sortlen);
8423 memmove (loc, p, runlen);
8424 memcpy (loc + runlen, buf, sortlen);
8426 p += runlen - elt_size;
8429 /* Hashes are no longer valid. */
8430 free (reldata->hashes);
8431 reldata->hashes = NULL;
8437 struct elf_link_sort_rela
8443 enum elf_reloc_type_class type;
8444 /* We use this as an array of size int_rels_per_ext_rel. */
8445 Elf_Internal_Rela rela[1];
8449 elf_link_sort_cmp1 (const void *A, const void *B)
8451 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8452 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8453 int relativea, relativeb;
8455 relativea = a->type == reloc_class_relative;
8456 relativeb = b->type == reloc_class_relative;
8458 if (relativea < relativeb)
8460 if (relativea > relativeb)
8462 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8464 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8466 if (a->rela->r_offset < b->rela->r_offset)
8468 if (a->rela->r_offset > b->rela->r_offset)
8474 elf_link_sort_cmp2 (const void *A, const void *B)
8476 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8477 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8479 if (a->type < b->type)
8481 if (a->type > b->type)
8483 if (a->u.offset < b->u.offset)
8485 if (a->u.offset > b->u.offset)
8487 if (a->rela->r_offset < b->rela->r_offset)
8489 if (a->rela->r_offset > b->rela->r_offset)
8495 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8497 asection *dynamic_relocs;
8500 bfd_size_type count, size;
8501 size_t i, ret, sort_elt, ext_size;
8502 bfd_byte *sort, *s_non_relative, *p;
8503 struct elf_link_sort_rela *sq;
8504 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8505 int i2e = bed->s->int_rels_per_ext_rel;
8506 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8507 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8508 struct bfd_link_order *lo;
8510 bfd_boolean use_rela;
8512 /* Find a dynamic reloc section. */
8513 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8514 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8515 if (rela_dyn != NULL && rela_dyn->size > 0
8516 && rel_dyn != NULL && rel_dyn->size > 0)
8518 bfd_boolean use_rela_initialised = FALSE;
8520 /* This is just here to stop gcc from complaining.
8521 It's initialization checking code is not perfect. */
8524 /* Both sections are present. Examine the sizes
8525 of the indirect sections to help us choose. */
8526 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8527 if (lo->type == bfd_indirect_link_order)
8529 asection *o = lo->u.indirect.section;
8531 if ((o->size % bed->s->sizeof_rela) == 0)
8533 if ((o->size % bed->s->sizeof_rel) == 0)
8534 /* Section size is divisible by both rel and rela sizes.
8535 It is of no help to us. */
8539 /* Section size is only divisible by rela. */
8540 if (use_rela_initialised && (use_rela == FALSE))
8543 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8544 bfd_set_error (bfd_error_invalid_operation);
8550 use_rela_initialised = TRUE;
8554 else if ((o->size % bed->s->sizeof_rel) == 0)
8556 /* Section size is only divisible by rel. */
8557 if (use_rela_initialised && (use_rela == TRUE))
8560 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8561 bfd_set_error (bfd_error_invalid_operation);
8567 use_rela_initialised = TRUE;
8572 /* The section size is not divisible by either - something is wrong. */
8574 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8575 bfd_set_error (bfd_error_invalid_operation);
8580 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8581 if (lo->type == bfd_indirect_link_order)
8583 asection *o = lo->u.indirect.section;
8585 if ((o->size % bed->s->sizeof_rela) == 0)
8587 if ((o->size % bed->s->sizeof_rel) == 0)
8588 /* Section size is divisible by both rel and rela sizes.
8589 It is of no help to us. */
8593 /* Section size is only divisible by rela. */
8594 if (use_rela_initialised && (use_rela == FALSE))
8597 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8598 bfd_set_error (bfd_error_invalid_operation);
8604 use_rela_initialised = TRUE;
8608 else if ((o->size % bed->s->sizeof_rel) == 0)
8610 /* Section size is only divisible by rel. */
8611 if (use_rela_initialised && (use_rela == TRUE))
8614 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8615 bfd_set_error (bfd_error_invalid_operation);
8621 use_rela_initialised = TRUE;
8626 /* The section size is not divisible by either - something is wrong. */
8628 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8629 bfd_set_error (bfd_error_invalid_operation);
8634 if (! use_rela_initialised)
8638 else if (rela_dyn != NULL && rela_dyn->size > 0)
8640 else if (rel_dyn != NULL && rel_dyn->size > 0)
8647 dynamic_relocs = rela_dyn;
8648 ext_size = bed->s->sizeof_rela;
8649 swap_in = bed->s->swap_reloca_in;
8650 swap_out = bed->s->swap_reloca_out;
8654 dynamic_relocs = rel_dyn;
8655 ext_size = bed->s->sizeof_rel;
8656 swap_in = bed->s->swap_reloc_in;
8657 swap_out = bed->s->swap_reloc_out;
8661 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8662 if (lo->type == bfd_indirect_link_order)
8663 size += lo->u.indirect.section->size;
8665 if (size != dynamic_relocs->size)
8668 sort_elt = (sizeof (struct elf_link_sort_rela)
8669 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8671 count = dynamic_relocs->size / ext_size;
8674 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8678 (*info->callbacks->warning)
8679 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8683 if (bed->s->arch_size == 32)
8684 r_sym_mask = ~(bfd_vma) 0xff;
8686 r_sym_mask = ~(bfd_vma) 0xffffffff;
8688 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8689 if (lo->type == bfd_indirect_link_order)
8691 bfd_byte *erel, *erelend;
8692 asection *o = lo->u.indirect.section;
8694 if (o->contents == NULL && o->size != 0)
8696 /* This is a reloc section that is being handled as a normal
8697 section. See bfd_section_from_shdr. We can't combine
8698 relocs in this case. */
8703 erelend = o->contents + o->size;
8704 /* FIXME: octets_per_byte. */
8705 p = sort + o->output_offset / ext_size * sort_elt;
8707 while (erel < erelend)
8709 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8711 (*swap_in) (abfd, erel, s->rela);
8712 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8713 s->u.sym_mask = r_sym_mask;
8719 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8721 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8723 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8724 if (s->type != reloc_class_relative)
8730 sq = (struct elf_link_sort_rela *) s_non_relative;
8731 for (; i < count; i++, p += sort_elt)
8733 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8734 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8736 sp->u.offset = sq->rela->r_offset;
8739 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8741 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8742 if (lo->type == bfd_indirect_link_order)
8744 bfd_byte *erel, *erelend;
8745 asection *o = lo->u.indirect.section;
8748 erelend = o->contents + o->size;
8749 /* FIXME: octets_per_byte. */
8750 p = sort + o->output_offset / ext_size * sort_elt;
8751 while (erel < erelend)
8753 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8754 (*swap_out) (abfd, s->rela, erel);
8761 *psec = dynamic_relocs;
8765 /* Add a symbol to the output symbol string table. */
8768 elf_link_output_symstrtab (struct elf_final_link_info *flinfo,
8770 Elf_Internal_Sym *elfsym,
8771 asection *input_sec,
8772 struct elf_link_hash_entry *h)
8774 int (*output_symbol_hook)
8775 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8776 struct elf_link_hash_entry *);
8777 struct elf_link_hash_table *hash_table;
8778 const struct elf_backend_data *bed;
8779 bfd_size_type strtabsize;
8781 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8783 bed = get_elf_backend_data (flinfo->output_bfd);
8784 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8785 if (output_symbol_hook != NULL)
8787 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8794 || (input_sec->flags & SEC_EXCLUDE))
8795 elfsym->st_name = (unsigned long) -1;
8798 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
8799 to get the final offset for st_name. */
8801 = (unsigned long) _bfd_elf_strtab_add (flinfo->symstrtab,
8803 if (elfsym->st_name == (unsigned long) -1)
8807 hash_table = elf_hash_table (flinfo->info);
8808 strtabsize = hash_table->strtabsize;
8809 if (strtabsize <= hash_table->strtabcount)
8811 strtabsize += strtabsize;
8812 hash_table->strtabsize = strtabsize;
8813 strtabsize *= sizeof (*hash_table->strtab);
8815 = (struct elf_sym_strtab *) bfd_realloc (hash_table->strtab,
8817 if (hash_table->strtab == NULL)
8820 hash_table->strtab[hash_table->strtabcount].sym = *elfsym;
8821 hash_table->strtab[hash_table->strtabcount].dest_index
8822 = hash_table->strtabcount;
8823 hash_table->strtab[hash_table->strtabcount].destshndx_index
8824 = flinfo->symshndxbuf ? bfd_get_symcount (flinfo->output_bfd) : 0;
8826 bfd_get_symcount (flinfo->output_bfd) += 1;
8827 hash_table->strtabcount += 1;
8832 /* Swap symbols out to the symbol table and flush the output symbols to
8836 elf_link_swap_symbols_out (struct elf_final_link_info *flinfo)
8838 struct elf_link_hash_table *hash_table = elf_hash_table (flinfo->info);
8839 bfd_size_type amt, i;
8840 const struct elf_backend_data *bed;
8842 Elf_Internal_Shdr *hdr;
8846 if (!hash_table->strtabcount)
8849 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8851 bed = get_elf_backend_data (flinfo->output_bfd);
8853 amt = bed->s->sizeof_sym * hash_table->strtabcount;
8854 symbuf = (bfd_byte *) bfd_malloc (amt);
8858 if (flinfo->symshndxbuf)
8860 amt = (sizeof (Elf_External_Sym_Shndx)
8861 * (bfd_get_symcount (flinfo->output_bfd)));
8862 flinfo->symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
8863 if (flinfo->symshndxbuf == NULL)
8870 for (i = 0; i < hash_table->strtabcount; i++)
8872 struct elf_sym_strtab *elfsym = &hash_table->strtab[i];
8873 if (elfsym->sym.st_name == (unsigned long) -1)
8874 elfsym->sym.st_name = 0;
8877 = (unsigned long) _bfd_elf_strtab_offset (flinfo->symstrtab,
8878 elfsym->sym.st_name);
8879 bed->s->swap_symbol_out (flinfo->output_bfd, &elfsym->sym,
8880 ((bfd_byte *) symbuf
8881 + (elfsym->dest_index
8882 * bed->s->sizeof_sym)),
8883 (flinfo->symshndxbuf
8884 + elfsym->destshndx_index));
8887 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8888 pos = hdr->sh_offset + hdr->sh_size;
8889 amt = hash_table->strtabcount * bed->s->sizeof_sym;
8890 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) == 0
8891 && bfd_bwrite (symbuf, amt, flinfo->output_bfd) == amt)
8893 hdr->sh_size += amt;
8901 free (hash_table->strtab);
8902 hash_table->strtab = NULL;
8907 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8910 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8912 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8913 && sym->st_shndx < SHN_LORESERVE)
8915 /* The gABI doesn't support dynamic symbols in output sections
8917 (*_bfd_error_handler)
8918 (_("%B: Too many sections: %d (>= %d)"),
8919 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8920 bfd_set_error (bfd_error_nonrepresentable_section);
8926 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8927 allowing an unsatisfied unversioned symbol in the DSO to match a
8928 versioned symbol that would normally require an explicit version.
8929 We also handle the case that a DSO references a hidden symbol
8930 which may be satisfied by a versioned symbol in another DSO. */
8933 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8934 const struct elf_backend_data *bed,
8935 struct elf_link_hash_entry *h)
8938 struct elf_link_loaded_list *loaded;
8940 if (!is_elf_hash_table (info->hash))
8943 /* Check indirect symbol. */
8944 while (h->root.type == bfd_link_hash_indirect)
8945 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8947 switch (h->root.type)
8953 case bfd_link_hash_undefined:
8954 case bfd_link_hash_undefweak:
8955 abfd = h->root.u.undef.abfd;
8956 if ((abfd->flags & DYNAMIC) == 0
8957 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8961 case bfd_link_hash_defined:
8962 case bfd_link_hash_defweak:
8963 abfd = h->root.u.def.section->owner;
8966 case bfd_link_hash_common:
8967 abfd = h->root.u.c.p->section->owner;
8970 BFD_ASSERT (abfd != NULL);
8972 for (loaded = elf_hash_table (info)->loaded;
8974 loaded = loaded->next)
8977 Elf_Internal_Shdr *hdr;
8978 bfd_size_type symcount;
8979 bfd_size_type extsymcount;
8980 bfd_size_type extsymoff;
8981 Elf_Internal_Shdr *versymhdr;
8982 Elf_Internal_Sym *isym;
8983 Elf_Internal_Sym *isymend;
8984 Elf_Internal_Sym *isymbuf;
8985 Elf_External_Versym *ever;
8986 Elf_External_Versym *extversym;
8988 input = loaded->abfd;
8990 /* We check each DSO for a possible hidden versioned definition. */
8992 || (input->flags & DYNAMIC) == 0
8993 || elf_dynversym (input) == 0)
8996 hdr = &elf_tdata (input)->dynsymtab_hdr;
8998 symcount = hdr->sh_size / bed->s->sizeof_sym;
8999 if (elf_bad_symtab (input))
9001 extsymcount = symcount;
9006 extsymcount = symcount - hdr->sh_info;
9007 extsymoff = hdr->sh_info;
9010 if (extsymcount == 0)
9013 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
9015 if (isymbuf == NULL)
9018 /* Read in any version definitions. */
9019 versymhdr = &elf_tdata (input)->dynversym_hdr;
9020 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
9021 if (extversym == NULL)
9024 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
9025 || (bfd_bread (extversym, versymhdr->sh_size, input)
9026 != versymhdr->sh_size))
9034 ever = extversym + extsymoff;
9035 isymend = isymbuf + extsymcount;
9036 for (isym = isymbuf; isym < isymend; isym++, ever++)
9039 Elf_Internal_Versym iver;
9040 unsigned short version_index;
9042 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
9043 || isym->st_shndx == SHN_UNDEF)
9046 name = bfd_elf_string_from_elf_section (input,
9049 if (strcmp (name, h->root.root.string) != 0)
9052 _bfd_elf_swap_versym_in (input, ever, &iver);
9054 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
9056 && h->forced_local))
9058 /* If we have a non-hidden versioned sym, then it should
9059 have provided a definition for the undefined sym unless
9060 it is defined in a non-shared object and forced local.
9065 version_index = iver.vs_vers & VERSYM_VERSION;
9066 if (version_index == 1 || version_index == 2)
9068 /* This is the base or first version. We can use it. */
9082 /* Convert ELF common symbol TYPE. */
9085 elf_link_convert_common_type (struct bfd_link_info *info, int type)
9087 /* Commom symbol can only appear in relocatable link. */
9088 if (!bfd_link_relocatable (info))
9090 switch (info->elf_stt_common)
9094 case elf_stt_common:
9097 case no_elf_stt_common:
9104 /* Add an external symbol to the symbol table. This is called from
9105 the hash table traversal routine. When generating a shared object,
9106 we go through the symbol table twice. The first time we output
9107 anything that might have been forced to local scope in a version
9108 script. The second time we output the symbols that are still
9112 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
9114 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
9115 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
9116 struct elf_final_link_info *flinfo = eoinfo->flinfo;
9118 Elf_Internal_Sym sym;
9119 asection *input_sec;
9120 const struct elf_backend_data *bed;
9124 /* A symbol is bound locally if it is forced local or it is locally
9125 defined, hidden versioned, not referenced by shared library and
9126 not exported when linking executable. */
9127 bfd_boolean local_bind = (h->forced_local
9128 || (bfd_link_executable (flinfo->info)
9129 && !flinfo->info->export_dynamic
9133 && h->versioned == versioned_hidden));
9135 if (h->root.type == bfd_link_hash_warning)
9137 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9138 if (h->root.type == bfd_link_hash_new)
9142 /* Decide whether to output this symbol in this pass. */
9143 if (eoinfo->localsyms)
9154 bed = get_elf_backend_data (flinfo->output_bfd);
9156 if (h->root.type == bfd_link_hash_undefined)
9158 /* If we have an undefined symbol reference here then it must have
9159 come from a shared library that is being linked in. (Undefined
9160 references in regular files have already been handled unless
9161 they are in unreferenced sections which are removed by garbage
9163 bfd_boolean ignore_undef = FALSE;
9165 /* Some symbols may be special in that the fact that they're
9166 undefined can be safely ignored - let backend determine that. */
9167 if (bed->elf_backend_ignore_undef_symbol)
9168 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
9170 /* If we are reporting errors for this situation then do so now. */
9173 && (!h->ref_regular || flinfo->info->gc_sections)
9174 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
9175 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
9177 if (!(flinfo->info->callbacks->undefined_symbol
9178 (flinfo->info, h->root.root.string,
9179 h->ref_regular ? NULL : h->root.u.undef.abfd,
9181 (flinfo->info->unresolved_syms_in_shared_libs
9182 == RM_GENERATE_ERROR))))
9184 bfd_set_error (bfd_error_bad_value);
9185 eoinfo->failed = TRUE;
9191 /* We should also warn if a forced local symbol is referenced from
9192 shared libraries. */
9193 if (bfd_link_executable (flinfo->info)
9198 && h->ref_dynamic_nonweak
9199 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
9203 struct elf_link_hash_entry *hi = h;
9205 /* Check indirect symbol. */
9206 while (hi->root.type == bfd_link_hash_indirect)
9207 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
9209 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
9210 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
9211 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
9212 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
9214 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
9215 def_bfd = flinfo->output_bfd;
9216 if (hi->root.u.def.section != bfd_abs_section_ptr)
9217 def_bfd = hi->root.u.def.section->owner;
9218 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
9219 h->root.root.string);
9220 bfd_set_error (bfd_error_bad_value);
9221 eoinfo->failed = TRUE;
9225 /* We don't want to output symbols that have never been mentioned by
9226 a regular file, or that we have been told to strip. However, if
9227 h->indx is set to -2, the symbol is used by a reloc and we must
9232 else if ((h->def_dynamic
9234 || h->root.type == bfd_link_hash_new)
9238 else if (flinfo->info->strip == strip_all)
9240 else if (flinfo->info->strip == strip_some
9241 && bfd_hash_lookup (flinfo->info->keep_hash,
9242 h->root.root.string, FALSE, FALSE) == NULL)
9244 else if ((h->root.type == bfd_link_hash_defined
9245 || h->root.type == bfd_link_hash_defweak)
9246 && ((flinfo->info->strip_discarded
9247 && discarded_section (h->root.u.def.section))
9248 || ((h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0
9249 && h->root.u.def.section->owner != NULL
9250 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
9252 else if ((h->root.type == bfd_link_hash_undefined
9253 || h->root.type == bfd_link_hash_undefweak)
9254 && h->root.u.undef.abfd != NULL
9255 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
9260 /* If we're stripping it, and it's not a dynamic symbol, there's
9261 nothing else to do. However, if it is a forced local symbol or
9262 an ifunc symbol we need to give the backend finish_dynamic_symbol
9263 function a chance to make it dynamic. */
9266 && type != STT_GNU_IFUNC
9267 && !h->forced_local)
9271 sym.st_size = h->size;
9272 sym.st_other = h->other;
9273 switch (h->root.type)
9276 case bfd_link_hash_new:
9277 case bfd_link_hash_warning:
9281 case bfd_link_hash_undefined:
9282 case bfd_link_hash_undefweak:
9283 input_sec = bfd_und_section_ptr;
9284 sym.st_shndx = SHN_UNDEF;
9287 case bfd_link_hash_defined:
9288 case bfd_link_hash_defweak:
9290 input_sec = h->root.u.def.section;
9291 if (input_sec->output_section != NULL)
9294 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
9295 input_sec->output_section);
9296 if (sym.st_shndx == SHN_BAD)
9298 (*_bfd_error_handler)
9299 (_("%B: could not find output section %A for input section %A"),
9300 flinfo->output_bfd, input_sec->output_section, input_sec);
9301 bfd_set_error (bfd_error_nonrepresentable_section);
9302 eoinfo->failed = TRUE;
9306 /* ELF symbols in relocatable files are section relative,
9307 but in nonrelocatable files they are virtual
9309 sym.st_value = h->root.u.def.value + input_sec->output_offset;
9310 if (!bfd_link_relocatable (flinfo->info))
9312 sym.st_value += input_sec->output_section->vma;
9313 if (h->type == STT_TLS)
9315 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
9316 if (tls_sec != NULL)
9317 sym.st_value -= tls_sec->vma;
9323 BFD_ASSERT (input_sec->owner == NULL
9324 || (input_sec->owner->flags & DYNAMIC) != 0);
9325 sym.st_shndx = SHN_UNDEF;
9326 input_sec = bfd_und_section_ptr;
9331 case bfd_link_hash_common:
9332 input_sec = h->root.u.c.p->section;
9333 sym.st_shndx = bed->common_section_index (input_sec);
9334 sym.st_value = 1 << h->root.u.c.p->alignment_power;
9337 case bfd_link_hash_indirect:
9338 /* These symbols are created by symbol versioning. They point
9339 to the decorated version of the name. For example, if the
9340 symbol foo@@GNU_1.2 is the default, which should be used when
9341 foo is used with no version, then we add an indirect symbol
9342 foo which points to foo@@GNU_1.2. We ignore these symbols,
9343 since the indirected symbol is already in the hash table. */
9347 if (type == STT_COMMON || type == STT_OBJECT)
9348 switch (h->root.type)
9350 case bfd_link_hash_common:
9351 type = elf_link_convert_common_type (flinfo->info, type);
9353 case bfd_link_hash_defined:
9354 case bfd_link_hash_defweak:
9355 if (bed->common_definition (&sym))
9356 type = elf_link_convert_common_type (flinfo->info, type);
9360 case bfd_link_hash_undefined:
9361 case bfd_link_hash_undefweak:
9369 sym.st_info = ELF_ST_INFO (STB_LOCAL, type);
9370 /* Turn off visibility on local symbol. */
9371 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
9373 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
9374 else if (h->unique_global && h->def_regular)
9375 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, type);
9376 else if (h->root.type == bfd_link_hash_undefweak
9377 || h->root.type == bfd_link_hash_defweak)
9378 sym.st_info = ELF_ST_INFO (STB_WEAK, type);
9380 sym.st_info = ELF_ST_INFO (STB_GLOBAL, type);
9381 sym.st_target_internal = h->target_internal;
9383 /* Give the processor backend a chance to tweak the symbol value,
9384 and also to finish up anything that needs to be done for this
9385 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
9386 forced local syms when non-shared is due to a historical quirk.
9387 STT_GNU_IFUNC symbol must go through PLT. */
9388 if ((h->type == STT_GNU_IFUNC
9390 && !bfd_link_relocatable (flinfo->info))
9391 || ((h->dynindx != -1
9393 && ((bfd_link_pic (flinfo->info)
9394 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
9395 || h->root.type != bfd_link_hash_undefweak))
9396 || !h->forced_local)
9397 && elf_hash_table (flinfo->info)->dynamic_sections_created))
9399 if (! ((*bed->elf_backend_finish_dynamic_symbol)
9400 (flinfo->output_bfd, flinfo->info, h, &sym)))
9402 eoinfo->failed = TRUE;
9407 /* If we are marking the symbol as undefined, and there are no
9408 non-weak references to this symbol from a regular object, then
9409 mark the symbol as weak undefined; if there are non-weak
9410 references, mark the symbol as strong. We can't do this earlier,
9411 because it might not be marked as undefined until the
9412 finish_dynamic_symbol routine gets through with it. */
9413 if (sym.st_shndx == SHN_UNDEF
9415 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
9416 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
9419 type = ELF_ST_TYPE (sym.st_info);
9421 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
9422 if (type == STT_GNU_IFUNC)
9425 if (h->ref_regular_nonweak)
9426 bindtype = STB_GLOBAL;
9428 bindtype = STB_WEAK;
9429 sym.st_info = ELF_ST_INFO (bindtype, type);
9432 /* If this is a symbol defined in a dynamic library, don't use the
9433 symbol size from the dynamic library. Relinking an executable
9434 against a new library may introduce gratuitous changes in the
9435 executable's symbols if we keep the size. */
9436 if (sym.st_shndx == SHN_UNDEF
9441 /* If a non-weak symbol with non-default visibility is not defined
9442 locally, it is a fatal error. */
9443 if (!bfd_link_relocatable (flinfo->info)
9444 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
9445 && ELF_ST_BIND (sym.st_info) != STB_WEAK
9446 && h->root.type == bfd_link_hash_undefined
9451 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
9452 msg = _("%B: protected symbol `%s' isn't defined");
9453 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
9454 msg = _("%B: internal symbol `%s' isn't defined");
9456 msg = _("%B: hidden symbol `%s' isn't defined");
9457 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
9458 bfd_set_error (bfd_error_bad_value);
9459 eoinfo->failed = TRUE;
9463 /* If this symbol should be put in the .dynsym section, then put it
9464 there now. We already know the symbol index. We also fill in
9465 the entry in the .hash section. */
9466 if (elf_hash_table (flinfo->info)->dynsym != NULL
9468 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9472 /* Since there is no version information in the dynamic string,
9473 if there is no version info in symbol version section, we will
9474 have a run-time problem if not linking executable, referenced
9475 by shared library, not locally defined, or not bound locally.
9477 if (h->verinfo.verdef == NULL
9479 && (!bfd_link_executable (flinfo->info)
9481 || !h->def_regular))
9483 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9485 if (p && p [1] != '\0')
9487 (*_bfd_error_handler)
9488 (_("%B: No symbol version section for versioned symbol `%s'"),
9489 flinfo->output_bfd, h->root.root.string);
9490 eoinfo->failed = TRUE;
9495 sym.st_name = h->dynstr_index;
9496 esym = (elf_hash_table (flinfo->info)->dynsym->contents
9497 + h->dynindx * bed->s->sizeof_sym);
9498 if (!check_dynsym (flinfo->output_bfd, &sym))
9500 eoinfo->failed = TRUE;
9503 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9505 if (flinfo->hash_sec != NULL)
9507 size_t hash_entry_size;
9508 bfd_byte *bucketpos;
9513 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9514 bucket = h->u.elf_hash_value % bucketcount;
9517 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9518 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9519 + (bucket + 2) * hash_entry_size);
9520 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9521 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9523 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9524 ((bfd_byte *) flinfo->hash_sec->contents
9525 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9528 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9530 Elf_Internal_Versym iversym;
9531 Elf_External_Versym *eversym;
9533 if (!h->def_regular)
9535 if (h->verinfo.verdef == NULL
9536 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
9537 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
9538 iversym.vs_vers = 0;
9540 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9544 if (h->verinfo.vertree == NULL)
9545 iversym.vs_vers = 1;
9547 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9548 if (flinfo->info->create_default_symver)
9552 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
9554 if (h->versioned == versioned_hidden && h->def_regular)
9555 iversym.vs_vers |= VERSYM_HIDDEN;
9557 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9558 eversym += h->dynindx;
9559 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9563 /* If the symbol is undefined, and we didn't output it to .dynsym,
9564 strip it from .symtab too. Obviously we can't do this for
9565 relocatable output or when needed for --emit-relocs. */
9566 else if (input_sec == bfd_und_section_ptr
9568 && !bfd_link_relocatable (flinfo->info))
9570 /* Also strip others that we couldn't earlier due to dynamic symbol
9574 if ((input_sec->flags & SEC_EXCLUDE) != 0)
9577 /* Output a FILE symbol so that following locals are not associated
9578 with the wrong input file. We need one for forced local symbols
9579 if we've seen more than one FILE symbol or when we have exactly
9580 one FILE symbol but global symbols are present in a file other
9581 than the one with the FILE symbol. We also need one if linker
9582 defined symbols are present. In practice these conditions are
9583 always met, so just emit the FILE symbol unconditionally. */
9584 if (eoinfo->localsyms
9585 && !eoinfo->file_sym_done
9586 && eoinfo->flinfo->filesym_count != 0)
9588 Elf_Internal_Sym fsym;
9590 memset (&fsym, 0, sizeof (fsym));
9591 fsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9592 fsym.st_shndx = SHN_ABS;
9593 if (!elf_link_output_symstrtab (eoinfo->flinfo, NULL, &fsym,
9594 bfd_und_section_ptr, NULL))
9597 eoinfo->file_sym_done = TRUE;
9600 indx = bfd_get_symcount (flinfo->output_bfd);
9601 ret = elf_link_output_symstrtab (flinfo, h->root.root.string, &sym,
9605 eoinfo->failed = TRUE;
9610 else if (h->indx == -2)
9616 /* Return TRUE if special handling is done for relocs in SEC against
9617 symbols defined in discarded sections. */
9620 elf_section_ignore_discarded_relocs (asection *sec)
9622 const struct elf_backend_data *bed;
9624 switch (sec->sec_info_type)
9626 case SEC_INFO_TYPE_STABS:
9627 case SEC_INFO_TYPE_EH_FRAME:
9628 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
9634 bed = get_elf_backend_data (sec->owner);
9635 if (bed->elf_backend_ignore_discarded_relocs != NULL
9636 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9642 /* Return a mask saying how ld should treat relocations in SEC against
9643 symbols defined in discarded sections. If this function returns
9644 COMPLAIN set, ld will issue a warning message. If this function
9645 returns PRETEND set, and the discarded section was link-once and the
9646 same size as the kept link-once section, ld will pretend that the
9647 symbol was actually defined in the kept section. Otherwise ld will
9648 zero the reloc (at least that is the intent, but some cooperation by
9649 the target dependent code is needed, particularly for REL targets). */
9652 _bfd_elf_default_action_discarded (asection *sec)
9654 if (sec->flags & SEC_DEBUGGING)
9657 if (strcmp (".eh_frame", sec->name) == 0)
9660 if (strcmp (".gcc_except_table", sec->name) == 0)
9663 return COMPLAIN | PRETEND;
9666 /* Find a match between a section and a member of a section group. */
9669 match_group_member (asection *sec, asection *group,
9670 struct bfd_link_info *info)
9672 asection *first = elf_next_in_group (group);
9673 asection *s = first;
9677 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9680 s = elf_next_in_group (s);
9688 /* Check if the kept section of a discarded section SEC can be used
9689 to replace it. Return the replacement if it is OK. Otherwise return
9693 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9697 kept = sec->kept_section;
9700 if ((kept->flags & SEC_GROUP) != 0)
9701 kept = match_group_member (sec, kept, info);
9703 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9704 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9706 sec->kept_section = kept;
9711 /* Link an input file into the linker output file. This function
9712 handles all the sections and relocations of the input file at once.
9713 This is so that we only have to read the local symbols once, and
9714 don't have to keep them in memory. */
9717 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9719 int (*relocate_section)
9720 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9721 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9723 Elf_Internal_Shdr *symtab_hdr;
9726 Elf_Internal_Sym *isymbuf;
9727 Elf_Internal_Sym *isym;
9728 Elf_Internal_Sym *isymend;
9730 asection **ppsection;
9732 const struct elf_backend_data *bed;
9733 struct elf_link_hash_entry **sym_hashes;
9734 bfd_size_type address_size;
9735 bfd_vma r_type_mask;
9737 bfd_boolean have_file_sym = FALSE;
9739 output_bfd = flinfo->output_bfd;
9740 bed = get_elf_backend_data (output_bfd);
9741 relocate_section = bed->elf_backend_relocate_section;
9743 /* If this is a dynamic object, we don't want to do anything here:
9744 we don't want the local symbols, and we don't want the section
9746 if ((input_bfd->flags & DYNAMIC) != 0)
9749 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9750 if (elf_bad_symtab (input_bfd))
9752 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9757 locsymcount = symtab_hdr->sh_info;
9758 extsymoff = symtab_hdr->sh_info;
9761 /* Read the local symbols. */
9762 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9763 if (isymbuf == NULL && locsymcount != 0)
9765 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9766 flinfo->internal_syms,
9767 flinfo->external_syms,
9768 flinfo->locsym_shndx);
9769 if (isymbuf == NULL)
9773 /* Find local symbol sections and adjust values of symbols in
9774 SEC_MERGE sections. Write out those local symbols we know are
9775 going into the output file. */
9776 isymend = isymbuf + locsymcount;
9777 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9779 isym++, pindex++, ppsection++)
9783 Elf_Internal_Sym osym;
9789 if (elf_bad_symtab (input_bfd))
9791 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9798 if (isym->st_shndx == SHN_UNDEF)
9799 isec = bfd_und_section_ptr;
9800 else if (isym->st_shndx == SHN_ABS)
9801 isec = bfd_abs_section_ptr;
9802 else if (isym->st_shndx == SHN_COMMON)
9803 isec = bfd_com_section_ptr;
9806 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9809 /* Don't attempt to output symbols with st_shnx in the
9810 reserved range other than SHN_ABS and SHN_COMMON. */
9814 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9815 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9817 _bfd_merged_section_offset (output_bfd, &isec,
9818 elf_section_data (isec)->sec_info,
9824 /* Don't output the first, undefined, symbol. In fact, don't
9825 output any undefined local symbol. */
9826 if (isec == bfd_und_section_ptr)
9829 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9831 /* We never output section symbols. Instead, we use the
9832 section symbol of the corresponding section in the output
9837 /* If we are stripping all symbols, we don't want to output this
9839 if (flinfo->info->strip == strip_all)
9842 /* If we are discarding all local symbols, we don't want to
9843 output this one. If we are generating a relocatable output
9844 file, then some of the local symbols may be required by
9845 relocs; we output them below as we discover that they are
9847 if (flinfo->info->discard == discard_all)
9850 /* If this symbol is defined in a section which we are
9851 discarding, we don't need to keep it. */
9852 if (isym->st_shndx != SHN_UNDEF
9853 && isym->st_shndx < SHN_LORESERVE
9854 && bfd_section_removed_from_list (output_bfd,
9855 isec->output_section))
9858 /* Get the name of the symbol. */
9859 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9864 /* See if we are discarding symbols with this name. */
9865 if ((flinfo->info->strip == strip_some
9866 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9868 || (((flinfo->info->discard == discard_sec_merge
9869 && (isec->flags & SEC_MERGE)
9870 && !bfd_link_relocatable (flinfo->info))
9871 || flinfo->info->discard == discard_l)
9872 && bfd_is_local_label_name (input_bfd, name)))
9875 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9877 if (input_bfd->lto_output)
9878 /* -flto puts a temp file name here. This means builds
9879 are not reproducible. Discard the symbol. */
9881 have_file_sym = TRUE;
9882 flinfo->filesym_count += 1;
9886 /* In the absence of debug info, bfd_find_nearest_line uses
9887 FILE symbols to determine the source file for local
9888 function symbols. Provide a FILE symbol here if input
9889 files lack such, so that their symbols won't be
9890 associated with a previous input file. It's not the
9891 source file, but the best we can do. */
9892 have_file_sym = TRUE;
9893 flinfo->filesym_count += 1;
9894 memset (&osym, 0, sizeof (osym));
9895 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9896 osym.st_shndx = SHN_ABS;
9897 if (!elf_link_output_symstrtab (flinfo,
9898 (input_bfd->lto_output ? NULL
9899 : input_bfd->filename),
9900 &osym, bfd_abs_section_ptr,
9907 /* Adjust the section index for the output file. */
9908 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9909 isec->output_section);
9910 if (osym.st_shndx == SHN_BAD)
9913 /* ELF symbols in relocatable files are section relative, but
9914 in executable files they are virtual addresses. Note that
9915 this code assumes that all ELF sections have an associated
9916 BFD section with a reasonable value for output_offset; below
9917 we assume that they also have a reasonable value for
9918 output_section. Any special sections must be set up to meet
9919 these requirements. */
9920 osym.st_value += isec->output_offset;
9921 if (!bfd_link_relocatable (flinfo->info))
9923 osym.st_value += isec->output_section->vma;
9924 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9926 /* STT_TLS symbols are relative to PT_TLS segment base. */
9927 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9928 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9932 indx = bfd_get_symcount (output_bfd);
9933 ret = elf_link_output_symstrtab (flinfo, name, &osym, isec, NULL);
9940 if (bed->s->arch_size == 32)
9948 r_type_mask = 0xffffffff;
9953 /* Relocate the contents of each section. */
9954 sym_hashes = elf_sym_hashes (input_bfd);
9955 for (o = input_bfd->sections; o != NULL; o = o->next)
9959 if (! o->linker_mark)
9961 /* This section was omitted from the link. */
9965 if (bfd_link_relocatable (flinfo->info)
9966 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9968 /* Deal with the group signature symbol. */
9969 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9970 unsigned long symndx = sec_data->this_hdr.sh_info;
9971 asection *osec = o->output_section;
9973 if (symndx >= locsymcount
9974 || (elf_bad_symtab (input_bfd)
9975 && flinfo->sections[symndx] == NULL))
9977 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9978 while (h->root.type == bfd_link_hash_indirect
9979 || h->root.type == bfd_link_hash_warning)
9980 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9981 /* Arrange for symbol to be output. */
9983 elf_section_data (osec)->this_hdr.sh_info = -2;
9985 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9987 /* We'll use the output section target_index. */
9988 asection *sec = flinfo->sections[symndx]->output_section;
9989 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9993 if (flinfo->indices[symndx] == -1)
9995 /* Otherwise output the local symbol now. */
9996 Elf_Internal_Sym sym = isymbuf[symndx];
9997 asection *sec = flinfo->sections[symndx]->output_section;
10002 name = bfd_elf_string_from_elf_section (input_bfd,
10003 symtab_hdr->sh_link,
10008 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
10010 if (sym.st_shndx == SHN_BAD)
10013 sym.st_value += o->output_offset;
10015 indx = bfd_get_symcount (output_bfd);
10016 ret = elf_link_output_symstrtab (flinfo, name, &sym, o,
10021 flinfo->indices[symndx] = indx;
10025 elf_section_data (osec)->this_hdr.sh_info
10026 = flinfo->indices[symndx];
10030 if ((o->flags & SEC_HAS_CONTENTS) == 0
10031 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
10034 if ((o->flags & SEC_LINKER_CREATED) != 0)
10036 /* Section was created by _bfd_elf_link_create_dynamic_sections
10041 /* Get the contents of the section. They have been cached by a
10042 relaxation routine. Note that o is a section in an input
10043 file, so the contents field will not have been set by any of
10044 the routines which work on output files. */
10045 if (elf_section_data (o)->this_hdr.contents != NULL)
10047 contents = elf_section_data (o)->this_hdr.contents;
10048 if (bed->caches_rawsize
10050 && o->rawsize < o->size)
10052 memcpy (flinfo->contents, contents, o->rawsize);
10053 contents = flinfo->contents;
10058 contents = flinfo->contents;
10059 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
10063 if ((o->flags & SEC_RELOC) != 0)
10065 Elf_Internal_Rela *internal_relocs;
10066 Elf_Internal_Rela *rel, *relend;
10067 int action_discarded;
10070 /* Get the swapped relocs. */
10072 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
10073 flinfo->internal_relocs, FALSE);
10074 if (internal_relocs == NULL
10075 && o->reloc_count > 0)
10078 /* We need to reverse-copy input .ctors/.dtors sections if
10079 they are placed in .init_array/.finit_array for output. */
10080 if (o->size > address_size
10081 && ((strncmp (o->name, ".ctors", 6) == 0
10082 && strcmp (o->output_section->name,
10083 ".init_array") == 0)
10084 || (strncmp (o->name, ".dtors", 6) == 0
10085 && strcmp (o->output_section->name,
10086 ".fini_array") == 0))
10087 && (o->name[6] == 0 || o->name[6] == '.'))
10089 if (o->size != o->reloc_count * address_size)
10091 (*_bfd_error_handler)
10092 (_("error: %B: size of section %A is not "
10093 "multiple of address size"),
10095 bfd_set_error (bfd_error_on_input);
10098 o->flags |= SEC_ELF_REVERSE_COPY;
10101 action_discarded = -1;
10102 if (!elf_section_ignore_discarded_relocs (o))
10103 action_discarded = (*bed->action_discarded) (o);
10105 /* Run through the relocs evaluating complex reloc symbols and
10106 looking for relocs against symbols from discarded sections
10107 or section symbols from removed link-once sections.
10108 Complain about relocs against discarded sections. Zero
10109 relocs against removed link-once sections. */
10111 rel = internal_relocs;
10112 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
10113 for ( ; rel < relend; rel++)
10115 unsigned long r_symndx = rel->r_info >> r_sym_shift;
10116 unsigned int s_type;
10117 asection **ps, *sec;
10118 struct elf_link_hash_entry *h = NULL;
10119 const char *sym_name;
10121 if (r_symndx == STN_UNDEF)
10124 if (r_symndx >= locsymcount
10125 || (elf_bad_symtab (input_bfd)
10126 && flinfo->sections[r_symndx] == NULL))
10128 h = sym_hashes[r_symndx - extsymoff];
10130 /* Badly formatted input files can contain relocs that
10131 reference non-existant symbols. Check here so that
10132 we do not seg fault. */
10137 sprintf_vma (buffer, rel->r_info);
10138 (*_bfd_error_handler)
10139 (_("error: %B contains a reloc (0x%s) for section %A "
10140 "that references a non-existent global symbol"),
10141 input_bfd, o, buffer);
10142 bfd_set_error (bfd_error_bad_value);
10146 while (h->root.type == bfd_link_hash_indirect
10147 || h->root.type == bfd_link_hash_warning)
10148 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10152 /* If a plugin symbol is referenced from a non-IR file,
10153 mark the symbol as undefined. Note that the
10154 linker may attach linker created dynamic sections
10155 to the plugin bfd. Symbols defined in linker
10156 created sections are not plugin symbols. */
10157 if (h->root.non_ir_ref
10158 && (h->root.type == bfd_link_hash_defined
10159 || h->root.type == bfd_link_hash_defweak)
10160 && (h->root.u.def.section->flags
10161 & SEC_LINKER_CREATED) == 0
10162 && h->root.u.def.section->owner != NULL
10163 && (h->root.u.def.section->owner->flags
10164 & BFD_PLUGIN) != 0)
10166 h->root.type = bfd_link_hash_undefined;
10167 h->root.u.undef.abfd = h->root.u.def.section->owner;
10171 if (h->root.type == bfd_link_hash_defined
10172 || h->root.type == bfd_link_hash_defweak)
10173 ps = &h->root.u.def.section;
10175 sym_name = h->root.root.string;
10179 Elf_Internal_Sym *sym = isymbuf + r_symndx;
10181 s_type = ELF_ST_TYPE (sym->st_info);
10182 ps = &flinfo->sections[r_symndx];
10183 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
10187 if ((s_type == STT_RELC || s_type == STT_SRELC)
10188 && !bfd_link_relocatable (flinfo->info))
10191 bfd_vma dot = (rel->r_offset
10192 + o->output_offset + o->output_section->vma);
10194 printf ("Encountered a complex symbol!");
10195 printf (" (input_bfd %s, section %s, reloc %ld\n",
10196 input_bfd->filename, o->name,
10197 (long) (rel - internal_relocs));
10198 printf (" symbol: idx %8.8lx, name %s\n",
10199 r_symndx, sym_name);
10200 printf (" reloc : info %8.8lx, addr %8.8lx\n",
10201 (unsigned long) rel->r_info,
10202 (unsigned long) rel->r_offset);
10204 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
10205 isymbuf, locsymcount, s_type == STT_SRELC))
10208 /* Symbol evaluated OK. Update to absolute value. */
10209 set_symbol_value (input_bfd, isymbuf, locsymcount,
10214 if (action_discarded != -1 && ps != NULL)
10216 /* Complain if the definition comes from a
10217 discarded section. */
10218 if ((sec = *ps) != NULL && discarded_section (sec))
10220 BFD_ASSERT (r_symndx != STN_UNDEF);
10221 if (action_discarded & COMPLAIN)
10222 (*flinfo->info->callbacks->einfo)
10223 (_("%X`%s' referenced in section `%A' of %B: "
10224 "defined in discarded section `%A' of %B\n"),
10225 sym_name, o, input_bfd, sec, sec->owner);
10227 /* Try to do the best we can to support buggy old
10228 versions of gcc. Pretend that the symbol is
10229 really defined in the kept linkonce section.
10230 FIXME: This is quite broken. Modifying the
10231 symbol here means we will be changing all later
10232 uses of the symbol, not just in this section. */
10233 if (action_discarded & PRETEND)
10237 kept = _bfd_elf_check_kept_section (sec,
10249 /* Relocate the section by invoking a back end routine.
10251 The back end routine is responsible for adjusting the
10252 section contents as necessary, and (if using Rela relocs
10253 and generating a relocatable output file) adjusting the
10254 reloc addend as necessary.
10256 The back end routine does not have to worry about setting
10257 the reloc address or the reloc symbol index.
10259 The back end routine is given a pointer to the swapped in
10260 internal symbols, and can access the hash table entries
10261 for the external symbols via elf_sym_hashes (input_bfd).
10263 When generating relocatable output, the back end routine
10264 must handle STB_LOCAL/STT_SECTION symbols specially. The
10265 output symbol is going to be a section symbol
10266 corresponding to the output section, which will require
10267 the addend to be adjusted. */
10269 ret = (*relocate_section) (output_bfd, flinfo->info,
10270 input_bfd, o, contents,
10278 || bfd_link_relocatable (flinfo->info)
10279 || flinfo->info->emitrelocations)
10281 Elf_Internal_Rela *irela;
10282 Elf_Internal_Rela *irelaend, *irelamid;
10283 bfd_vma last_offset;
10284 struct elf_link_hash_entry **rel_hash;
10285 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
10286 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
10287 unsigned int next_erel;
10288 bfd_boolean rela_normal;
10289 struct bfd_elf_section_data *esdi, *esdo;
10291 esdi = elf_section_data (o);
10292 esdo = elf_section_data (o->output_section);
10293 rela_normal = FALSE;
10295 /* Adjust the reloc addresses and symbol indices. */
10297 irela = internal_relocs;
10298 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
10299 rel_hash = esdo->rel.hashes + esdo->rel.count;
10300 /* We start processing the REL relocs, if any. When we reach
10301 IRELAMID in the loop, we switch to the RELA relocs. */
10303 if (esdi->rel.hdr != NULL)
10304 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
10305 * bed->s->int_rels_per_ext_rel);
10306 rel_hash_list = rel_hash;
10307 rela_hash_list = NULL;
10308 last_offset = o->output_offset;
10309 if (!bfd_link_relocatable (flinfo->info))
10310 last_offset += o->output_section->vma;
10311 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
10313 unsigned long r_symndx;
10315 Elf_Internal_Sym sym;
10317 if (next_erel == bed->s->int_rels_per_ext_rel)
10323 if (irela == irelamid)
10325 rel_hash = esdo->rela.hashes + esdo->rela.count;
10326 rela_hash_list = rel_hash;
10327 rela_normal = bed->rela_normal;
10330 irela->r_offset = _bfd_elf_section_offset (output_bfd,
10333 if (irela->r_offset >= (bfd_vma) -2)
10335 /* This is a reloc for a deleted entry or somesuch.
10336 Turn it into an R_*_NONE reloc, at the same
10337 offset as the last reloc. elf_eh_frame.c and
10338 bfd_elf_discard_info rely on reloc offsets
10340 irela->r_offset = last_offset;
10342 irela->r_addend = 0;
10346 irela->r_offset += o->output_offset;
10348 /* Relocs in an executable have to be virtual addresses. */
10349 if (!bfd_link_relocatable (flinfo->info))
10350 irela->r_offset += o->output_section->vma;
10352 last_offset = irela->r_offset;
10354 r_symndx = irela->r_info >> r_sym_shift;
10355 if (r_symndx == STN_UNDEF)
10358 if (r_symndx >= locsymcount
10359 || (elf_bad_symtab (input_bfd)
10360 && flinfo->sections[r_symndx] == NULL))
10362 struct elf_link_hash_entry *rh;
10363 unsigned long indx;
10365 /* This is a reloc against a global symbol. We
10366 have not yet output all the local symbols, so
10367 we do not know the symbol index of any global
10368 symbol. We set the rel_hash entry for this
10369 reloc to point to the global hash table entry
10370 for this symbol. The symbol index is then
10371 set at the end of bfd_elf_final_link. */
10372 indx = r_symndx - extsymoff;
10373 rh = elf_sym_hashes (input_bfd)[indx];
10374 while (rh->root.type == bfd_link_hash_indirect
10375 || rh->root.type == bfd_link_hash_warning)
10376 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
10378 /* Setting the index to -2 tells
10379 elf_link_output_extsym that this symbol is
10380 used by a reloc. */
10381 BFD_ASSERT (rh->indx < 0);
10389 /* This is a reloc against a local symbol. */
10392 sym = isymbuf[r_symndx];
10393 sec = flinfo->sections[r_symndx];
10394 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
10396 /* I suppose the backend ought to fill in the
10397 section of any STT_SECTION symbol against a
10398 processor specific section. */
10399 r_symndx = STN_UNDEF;
10400 if (bfd_is_abs_section (sec))
10402 else if (sec == NULL || sec->owner == NULL)
10404 bfd_set_error (bfd_error_bad_value);
10409 asection *osec = sec->output_section;
10411 /* If we have discarded a section, the output
10412 section will be the absolute section. In
10413 case of discarded SEC_MERGE sections, use
10414 the kept section. relocate_section should
10415 have already handled discarded linkonce
10417 if (bfd_is_abs_section (osec)
10418 && sec->kept_section != NULL
10419 && sec->kept_section->output_section != NULL)
10421 osec = sec->kept_section->output_section;
10422 irela->r_addend -= osec->vma;
10425 if (!bfd_is_abs_section (osec))
10427 r_symndx = osec->target_index;
10428 if (r_symndx == STN_UNDEF)
10430 irela->r_addend += osec->vma;
10431 osec = _bfd_nearby_section (output_bfd, osec,
10433 irela->r_addend -= osec->vma;
10434 r_symndx = osec->target_index;
10439 /* Adjust the addend according to where the
10440 section winds up in the output section. */
10442 irela->r_addend += sec->output_offset;
10446 if (flinfo->indices[r_symndx] == -1)
10448 unsigned long shlink;
10453 if (flinfo->info->strip == strip_all)
10455 /* You can't do ld -r -s. */
10456 bfd_set_error (bfd_error_invalid_operation);
10460 /* This symbol was skipped earlier, but
10461 since it is needed by a reloc, we
10462 must output it now. */
10463 shlink = symtab_hdr->sh_link;
10464 name = (bfd_elf_string_from_elf_section
10465 (input_bfd, shlink, sym.st_name));
10469 osec = sec->output_section;
10471 _bfd_elf_section_from_bfd_section (output_bfd,
10473 if (sym.st_shndx == SHN_BAD)
10476 sym.st_value += sec->output_offset;
10477 if (!bfd_link_relocatable (flinfo->info))
10479 sym.st_value += osec->vma;
10480 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
10482 /* STT_TLS symbols are relative to PT_TLS
10484 BFD_ASSERT (elf_hash_table (flinfo->info)
10485 ->tls_sec != NULL);
10486 sym.st_value -= (elf_hash_table (flinfo->info)
10491 indx = bfd_get_symcount (output_bfd);
10492 ret = elf_link_output_symstrtab (flinfo, name,
10498 flinfo->indices[r_symndx] = indx;
10503 r_symndx = flinfo->indices[r_symndx];
10506 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
10507 | (irela->r_info & r_type_mask));
10510 /* Swap out the relocs. */
10511 input_rel_hdr = esdi->rel.hdr;
10512 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
10514 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10519 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
10520 * bed->s->int_rels_per_ext_rel);
10521 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
10524 input_rela_hdr = esdi->rela.hdr;
10525 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
10527 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10536 /* Write out the modified section contents. */
10537 if (bed->elf_backend_write_section
10538 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
10541 /* Section written out. */
10543 else switch (o->sec_info_type)
10545 case SEC_INFO_TYPE_STABS:
10546 if (! (_bfd_write_section_stabs
10548 &elf_hash_table (flinfo->info)->stab_info,
10549 o, &elf_section_data (o)->sec_info, contents)))
10552 case SEC_INFO_TYPE_MERGE:
10553 if (! _bfd_write_merged_section (output_bfd, o,
10554 elf_section_data (o)->sec_info))
10557 case SEC_INFO_TYPE_EH_FRAME:
10559 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10564 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
10566 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd,
10574 if (! (o->flags & SEC_EXCLUDE))
10576 file_ptr offset = (file_ptr) o->output_offset;
10577 bfd_size_type todo = o->size;
10579 offset *= bfd_octets_per_byte (output_bfd);
10581 if ((o->flags & SEC_ELF_REVERSE_COPY))
10583 /* Reverse-copy input section to output. */
10586 todo -= address_size;
10587 if (! bfd_set_section_contents (output_bfd,
10595 offset += address_size;
10599 else if (! bfd_set_section_contents (output_bfd,
10613 /* Generate a reloc when linking an ELF file. This is a reloc
10614 requested by the linker, and does not come from any input file. This
10615 is used to build constructor and destructor tables when linking
10619 elf_reloc_link_order (bfd *output_bfd,
10620 struct bfd_link_info *info,
10621 asection *output_section,
10622 struct bfd_link_order *link_order)
10624 reloc_howto_type *howto;
10628 struct bfd_elf_section_reloc_data *reldata;
10629 struct elf_link_hash_entry **rel_hash_ptr;
10630 Elf_Internal_Shdr *rel_hdr;
10631 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10632 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10635 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10637 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10640 bfd_set_error (bfd_error_bad_value);
10644 addend = link_order->u.reloc.p->addend;
10647 reldata = &esdo->rel;
10648 else if (esdo->rela.hdr)
10649 reldata = &esdo->rela;
10656 /* Figure out the symbol index. */
10657 rel_hash_ptr = reldata->hashes + reldata->count;
10658 if (link_order->type == bfd_section_reloc_link_order)
10660 indx = link_order->u.reloc.p->u.section->target_index;
10661 BFD_ASSERT (indx != 0);
10662 *rel_hash_ptr = NULL;
10666 struct elf_link_hash_entry *h;
10668 /* Treat a reloc against a defined symbol as though it were
10669 actually against the section. */
10670 h = ((struct elf_link_hash_entry *)
10671 bfd_wrapped_link_hash_lookup (output_bfd, info,
10672 link_order->u.reloc.p->u.name,
10673 FALSE, FALSE, TRUE));
10675 && (h->root.type == bfd_link_hash_defined
10676 || h->root.type == bfd_link_hash_defweak))
10680 section = h->root.u.def.section;
10681 indx = section->output_section->target_index;
10682 *rel_hash_ptr = NULL;
10683 /* It seems that we ought to add the symbol value to the
10684 addend here, but in practice it has already been added
10685 because it was passed to constructor_callback. */
10686 addend += section->output_section->vma + section->output_offset;
10688 else if (h != NULL)
10690 /* Setting the index to -2 tells elf_link_output_extsym that
10691 this symbol is used by a reloc. */
10698 if (! ((*info->callbacks->unattached_reloc)
10699 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10705 /* If this is an inplace reloc, we must write the addend into the
10707 if (howto->partial_inplace && addend != 0)
10709 bfd_size_type size;
10710 bfd_reloc_status_type rstat;
10713 const char *sym_name;
10715 size = (bfd_size_type) bfd_get_reloc_size (howto);
10716 buf = (bfd_byte *) bfd_zmalloc (size);
10717 if (buf == NULL && size != 0)
10719 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10726 case bfd_reloc_outofrange:
10729 case bfd_reloc_overflow:
10730 if (link_order->type == bfd_section_reloc_link_order)
10731 sym_name = bfd_section_name (output_bfd,
10732 link_order->u.reloc.p->u.section);
10734 sym_name = link_order->u.reloc.p->u.name;
10735 if (! ((*info->callbacks->reloc_overflow)
10736 (info, NULL, sym_name, howto->name, addend, NULL,
10737 NULL, (bfd_vma) 0)))
10745 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10747 * bfd_octets_per_byte (output_bfd),
10754 /* The address of a reloc is relative to the section in a
10755 relocatable file, and is a virtual address in an executable
10757 offset = link_order->offset;
10758 if (! bfd_link_relocatable (info))
10759 offset += output_section->vma;
10761 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10763 irel[i].r_offset = offset;
10764 irel[i].r_info = 0;
10765 irel[i].r_addend = 0;
10767 if (bed->s->arch_size == 32)
10768 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10770 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10772 rel_hdr = reldata->hdr;
10773 erel = rel_hdr->contents;
10774 if (rel_hdr->sh_type == SHT_REL)
10776 erel += reldata->count * bed->s->sizeof_rel;
10777 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10781 irel[0].r_addend = addend;
10782 erel += reldata->count * bed->s->sizeof_rela;
10783 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10792 /* Get the output vma of the section pointed to by the sh_link field. */
10795 elf_get_linked_section_vma (struct bfd_link_order *p)
10797 Elf_Internal_Shdr **elf_shdrp;
10801 s = p->u.indirect.section;
10802 elf_shdrp = elf_elfsections (s->owner);
10803 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10804 elfsec = elf_shdrp[elfsec]->sh_link;
10806 The Intel C compiler generates SHT_IA_64_UNWIND with
10807 SHF_LINK_ORDER. But it doesn't set the sh_link or
10808 sh_info fields. Hence we could get the situation
10809 where elfsec is 0. */
10812 const struct elf_backend_data *bed
10813 = get_elf_backend_data (s->owner);
10814 if (bed->link_order_error_handler)
10815 bed->link_order_error_handler
10816 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10821 s = elf_shdrp[elfsec]->bfd_section;
10822 return s->output_section->vma + s->output_offset;
10827 /* Compare two sections based on the locations of the sections they are
10828 linked to. Used by elf_fixup_link_order. */
10831 compare_link_order (const void * a, const void * b)
10836 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10837 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10840 return apos > bpos;
10844 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10845 order as their linked sections. Returns false if this could not be done
10846 because an output section includes both ordered and unordered
10847 sections. Ideally we'd do this in the linker proper. */
10850 elf_fixup_link_order (bfd *abfd, asection *o)
10852 int seen_linkorder;
10855 struct bfd_link_order *p;
10857 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10859 struct bfd_link_order **sections;
10860 asection *s, *other_sec, *linkorder_sec;
10864 linkorder_sec = NULL;
10866 seen_linkorder = 0;
10867 for (p = o->map_head.link_order; p != NULL; p = p->next)
10869 if (p->type == bfd_indirect_link_order)
10871 s = p->u.indirect.section;
10873 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10874 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10875 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10876 && elfsec < elf_numsections (sub)
10877 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10878 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10892 if (seen_other && seen_linkorder)
10894 if (other_sec && linkorder_sec)
10895 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10897 linkorder_sec->owner, other_sec,
10900 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10902 bfd_set_error (bfd_error_bad_value);
10907 if (!seen_linkorder)
10910 sections = (struct bfd_link_order **)
10911 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10912 if (sections == NULL)
10914 seen_linkorder = 0;
10916 for (p = o->map_head.link_order; p != NULL; p = p->next)
10918 sections[seen_linkorder++] = p;
10920 /* Sort the input sections in the order of their linked section. */
10921 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10922 compare_link_order);
10924 /* Change the offsets of the sections. */
10926 for (n = 0; n < seen_linkorder; n++)
10928 s = sections[n]->u.indirect.section;
10929 offset &= ~(bfd_vma) 0 << s->alignment_power;
10930 s->output_offset = offset / bfd_octets_per_byte (abfd);
10931 sections[n]->offset = offset;
10932 offset += sections[n]->size;
10940 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10944 if (flinfo->symstrtab != NULL)
10945 _bfd_elf_strtab_free (flinfo->symstrtab);
10946 if (flinfo->contents != NULL)
10947 free (flinfo->contents);
10948 if (flinfo->external_relocs != NULL)
10949 free (flinfo->external_relocs);
10950 if (flinfo->internal_relocs != NULL)
10951 free (flinfo->internal_relocs);
10952 if (flinfo->external_syms != NULL)
10953 free (flinfo->external_syms);
10954 if (flinfo->locsym_shndx != NULL)
10955 free (flinfo->locsym_shndx);
10956 if (flinfo->internal_syms != NULL)
10957 free (flinfo->internal_syms);
10958 if (flinfo->indices != NULL)
10959 free (flinfo->indices);
10960 if (flinfo->sections != NULL)
10961 free (flinfo->sections);
10962 if (flinfo->symshndxbuf != NULL)
10963 free (flinfo->symshndxbuf);
10964 for (o = obfd->sections; o != NULL; o = o->next)
10966 struct bfd_elf_section_data *esdo = elf_section_data (o);
10967 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10968 free (esdo->rel.hashes);
10969 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10970 free (esdo->rela.hashes);
10974 /* Do the final step of an ELF link. */
10977 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10979 bfd_boolean dynamic;
10980 bfd_boolean emit_relocs;
10982 struct elf_final_link_info flinfo;
10984 struct bfd_link_order *p;
10986 bfd_size_type max_contents_size;
10987 bfd_size_type max_external_reloc_size;
10988 bfd_size_type max_internal_reloc_count;
10989 bfd_size_type max_sym_count;
10990 bfd_size_type max_sym_shndx_count;
10991 Elf_Internal_Sym elfsym;
10993 Elf_Internal_Shdr *symtab_hdr;
10994 Elf_Internal_Shdr *symtab_shndx_hdr;
10995 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10996 struct elf_outext_info eoinfo;
10997 bfd_boolean merged;
10998 size_t relativecount = 0;
10999 asection *reldyn = 0;
11001 asection *attr_section = NULL;
11002 bfd_vma attr_size = 0;
11003 const char *std_attrs_section;
11005 if (! is_elf_hash_table (info->hash))
11008 if (bfd_link_pic (info))
11009 abfd->flags |= DYNAMIC;
11011 dynamic = elf_hash_table (info)->dynamic_sections_created;
11012 dynobj = elf_hash_table (info)->dynobj;
11014 emit_relocs = (bfd_link_relocatable (info)
11015 || info->emitrelocations);
11017 flinfo.info = info;
11018 flinfo.output_bfd = abfd;
11019 flinfo.symstrtab = _bfd_elf_strtab_init ();
11020 if (flinfo.symstrtab == NULL)
11025 flinfo.hash_sec = NULL;
11026 flinfo.symver_sec = NULL;
11030 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
11031 /* Note that dynsym_sec can be NULL (on VMS). */
11032 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
11033 /* Note that it is OK if symver_sec is NULL. */
11036 flinfo.contents = NULL;
11037 flinfo.external_relocs = NULL;
11038 flinfo.internal_relocs = NULL;
11039 flinfo.external_syms = NULL;
11040 flinfo.locsym_shndx = NULL;
11041 flinfo.internal_syms = NULL;
11042 flinfo.indices = NULL;
11043 flinfo.sections = NULL;
11044 flinfo.symshndxbuf = NULL;
11045 flinfo.filesym_count = 0;
11047 /* The object attributes have been merged. Remove the input
11048 sections from the link, and set the contents of the output
11050 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
11051 for (o = abfd->sections; o != NULL; o = o->next)
11053 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
11054 || strcmp (o->name, ".gnu.attributes") == 0)
11056 for (p = o->map_head.link_order; p != NULL; p = p->next)
11058 asection *input_section;
11060 if (p->type != bfd_indirect_link_order)
11062 input_section = p->u.indirect.section;
11063 /* Hack: reset the SEC_HAS_CONTENTS flag so that
11064 elf_link_input_bfd ignores this section. */
11065 input_section->flags &= ~SEC_HAS_CONTENTS;
11068 attr_size = bfd_elf_obj_attr_size (abfd);
11071 bfd_set_section_size (abfd, o, attr_size);
11073 /* Skip this section later on. */
11074 o->map_head.link_order = NULL;
11077 o->flags |= SEC_EXCLUDE;
11081 /* Count up the number of relocations we will output for each output
11082 section, so that we know the sizes of the reloc sections. We
11083 also figure out some maximum sizes. */
11084 max_contents_size = 0;
11085 max_external_reloc_size = 0;
11086 max_internal_reloc_count = 0;
11088 max_sym_shndx_count = 0;
11090 for (o = abfd->sections; o != NULL; o = o->next)
11092 struct bfd_elf_section_data *esdo = elf_section_data (o);
11093 o->reloc_count = 0;
11095 for (p = o->map_head.link_order; p != NULL; p = p->next)
11097 unsigned int reloc_count = 0;
11098 unsigned int additional_reloc_count = 0;
11099 struct bfd_elf_section_data *esdi = NULL;
11101 if (p->type == bfd_section_reloc_link_order
11102 || p->type == bfd_symbol_reloc_link_order)
11104 else if (p->type == bfd_indirect_link_order)
11108 sec = p->u.indirect.section;
11109 esdi = elf_section_data (sec);
11111 /* Mark all sections which are to be included in the
11112 link. This will normally be every section. We need
11113 to do this so that we can identify any sections which
11114 the linker has decided to not include. */
11115 sec->linker_mark = TRUE;
11117 if (sec->flags & SEC_MERGE)
11120 if (esdo->this_hdr.sh_type == SHT_REL
11121 || esdo->this_hdr.sh_type == SHT_RELA)
11122 /* Some backends use reloc_count in relocation sections
11123 to count particular types of relocs. Of course,
11124 reloc sections themselves can't have relocations. */
11126 else if (emit_relocs)
11128 reloc_count = sec->reloc_count;
11129 if (bed->elf_backend_count_additional_relocs)
11132 c = (*bed->elf_backend_count_additional_relocs) (sec);
11133 additional_reloc_count += c;
11136 else if (bed->elf_backend_count_relocs)
11137 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
11139 if (sec->rawsize > max_contents_size)
11140 max_contents_size = sec->rawsize;
11141 if (sec->size > max_contents_size)
11142 max_contents_size = sec->size;
11144 /* We are interested in just local symbols, not all
11146 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
11147 && (sec->owner->flags & DYNAMIC) == 0)
11151 if (elf_bad_symtab (sec->owner))
11152 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
11153 / bed->s->sizeof_sym);
11155 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
11157 if (sym_count > max_sym_count)
11158 max_sym_count = sym_count;
11160 if (sym_count > max_sym_shndx_count
11161 && elf_symtab_shndx_list (sec->owner) != NULL)
11162 max_sym_shndx_count = sym_count;
11164 if ((sec->flags & SEC_RELOC) != 0)
11166 size_t ext_size = 0;
11168 if (esdi->rel.hdr != NULL)
11169 ext_size = esdi->rel.hdr->sh_size;
11170 if (esdi->rela.hdr != NULL)
11171 ext_size += esdi->rela.hdr->sh_size;
11173 if (ext_size > max_external_reloc_size)
11174 max_external_reloc_size = ext_size;
11175 if (sec->reloc_count > max_internal_reloc_count)
11176 max_internal_reloc_count = sec->reloc_count;
11181 if (reloc_count == 0)
11184 reloc_count += additional_reloc_count;
11185 o->reloc_count += reloc_count;
11187 if (p->type == bfd_indirect_link_order && emit_relocs)
11191 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
11192 esdo->rel.count += additional_reloc_count;
11194 if (esdi->rela.hdr)
11196 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
11197 esdo->rela.count += additional_reloc_count;
11203 esdo->rela.count += reloc_count;
11205 esdo->rel.count += reloc_count;
11209 if (o->reloc_count > 0)
11210 o->flags |= SEC_RELOC;
11213 /* Explicitly clear the SEC_RELOC flag. The linker tends to
11214 set it (this is probably a bug) and if it is set
11215 assign_section_numbers will create a reloc section. */
11216 o->flags &=~ SEC_RELOC;
11219 /* If the SEC_ALLOC flag is not set, force the section VMA to
11220 zero. This is done in elf_fake_sections as well, but forcing
11221 the VMA to 0 here will ensure that relocs against these
11222 sections are handled correctly. */
11223 if ((o->flags & SEC_ALLOC) == 0
11224 && ! o->user_set_vma)
11228 if (! bfd_link_relocatable (info) && merged)
11229 elf_link_hash_traverse (elf_hash_table (info),
11230 _bfd_elf_link_sec_merge_syms, abfd);
11232 /* Figure out the file positions for everything but the symbol table
11233 and the relocs. We set symcount to force assign_section_numbers
11234 to create a symbol table. */
11235 bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
11236 BFD_ASSERT (! abfd->output_has_begun);
11237 if (! _bfd_elf_compute_section_file_positions (abfd, info))
11240 /* Set sizes, and assign file positions for reloc sections. */
11241 for (o = abfd->sections; o != NULL; o = o->next)
11243 struct bfd_elf_section_data *esdo = elf_section_data (o);
11244 if ((o->flags & SEC_RELOC) != 0)
11247 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
11251 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
11255 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
11256 to count upwards while actually outputting the relocations. */
11257 esdo->rel.count = 0;
11258 esdo->rela.count = 0;
11260 if (esdo->this_hdr.sh_offset == (file_ptr) -1)
11262 /* Cache the section contents so that they can be compressed
11263 later. Use bfd_malloc since it will be freed by
11264 bfd_compress_section_contents. */
11265 unsigned char *contents = esdo->this_hdr.contents;
11266 if ((o->flags & SEC_ELF_COMPRESS) == 0 || contents != NULL)
11269 = (unsigned char *) bfd_malloc (esdo->this_hdr.sh_size);
11270 if (contents == NULL)
11272 esdo->this_hdr.contents = contents;
11276 /* We have now assigned file positions for all the sections except
11277 .symtab, .strtab, and non-loaded reloc sections. We start the
11278 .symtab section at the current file position, and write directly
11279 to it. We build the .strtab section in memory. */
11280 bfd_get_symcount (abfd) = 0;
11281 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11282 /* sh_name is set in prep_headers. */
11283 symtab_hdr->sh_type = SHT_SYMTAB;
11284 /* sh_flags, sh_addr and sh_size all start off zero. */
11285 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
11286 /* sh_link is set in assign_section_numbers. */
11287 /* sh_info is set below. */
11288 /* sh_offset is set just below. */
11289 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
11291 if (max_sym_count < 20)
11292 max_sym_count = 20;
11293 elf_hash_table (info)->strtabsize = max_sym_count;
11294 amt = max_sym_count * sizeof (struct elf_sym_strtab);
11295 elf_hash_table (info)->strtab
11296 = (struct elf_sym_strtab *) bfd_malloc (amt);
11297 if (elf_hash_table (info)->strtab == NULL)
11299 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
11301 = (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF)
11302 ? (Elf_External_Sym_Shndx *) -1 : NULL);
11304 if (info->strip != strip_all || emit_relocs)
11306 file_ptr off = elf_next_file_pos (abfd);
11308 _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
11310 /* Note that at this point elf_next_file_pos (abfd) is
11311 incorrect. We do not yet know the size of the .symtab section.
11312 We correct next_file_pos below, after we do know the size. */
11314 /* Start writing out the symbol table. The first symbol is always a
11316 elfsym.st_value = 0;
11317 elfsym.st_size = 0;
11318 elfsym.st_info = 0;
11319 elfsym.st_other = 0;
11320 elfsym.st_shndx = SHN_UNDEF;
11321 elfsym.st_target_internal = 0;
11322 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym,
11323 bfd_und_section_ptr, NULL) != 1)
11326 /* Output a symbol for each section. We output these even if we are
11327 discarding local symbols, since they are used for relocs. These
11328 symbols have no names. We store the index of each one in the
11329 index field of the section, so that we can find it again when
11330 outputting relocs. */
11332 elfsym.st_size = 0;
11333 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11334 elfsym.st_other = 0;
11335 elfsym.st_value = 0;
11336 elfsym.st_target_internal = 0;
11337 for (i = 1; i < elf_numsections (abfd); i++)
11339 o = bfd_section_from_elf_index (abfd, i);
11342 o->target_index = bfd_get_symcount (abfd);
11343 elfsym.st_shndx = i;
11344 if (!bfd_link_relocatable (info))
11345 elfsym.st_value = o->vma;
11346 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym, o,
11353 /* Allocate some memory to hold information read in from the input
11355 if (max_contents_size != 0)
11357 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
11358 if (flinfo.contents == NULL)
11362 if (max_external_reloc_size != 0)
11364 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
11365 if (flinfo.external_relocs == NULL)
11369 if (max_internal_reloc_count != 0)
11371 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
11372 amt *= sizeof (Elf_Internal_Rela);
11373 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
11374 if (flinfo.internal_relocs == NULL)
11378 if (max_sym_count != 0)
11380 amt = max_sym_count * bed->s->sizeof_sym;
11381 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
11382 if (flinfo.external_syms == NULL)
11385 amt = max_sym_count * sizeof (Elf_Internal_Sym);
11386 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
11387 if (flinfo.internal_syms == NULL)
11390 amt = max_sym_count * sizeof (long);
11391 flinfo.indices = (long int *) bfd_malloc (amt);
11392 if (flinfo.indices == NULL)
11395 amt = max_sym_count * sizeof (asection *);
11396 flinfo.sections = (asection **) bfd_malloc (amt);
11397 if (flinfo.sections == NULL)
11401 if (max_sym_shndx_count != 0)
11403 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
11404 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
11405 if (flinfo.locsym_shndx == NULL)
11409 if (elf_hash_table (info)->tls_sec)
11411 bfd_vma base, end = 0;
11414 for (sec = elf_hash_table (info)->tls_sec;
11415 sec && (sec->flags & SEC_THREAD_LOCAL);
11418 bfd_size_type size = sec->size;
11421 && (sec->flags & SEC_HAS_CONTENTS) == 0)
11423 struct bfd_link_order *ord = sec->map_tail.link_order;
11426 size = ord->offset + ord->size;
11428 end = sec->vma + size;
11430 base = elf_hash_table (info)->tls_sec->vma;
11431 /* Only align end of TLS section if static TLS doesn't have special
11432 alignment requirements. */
11433 if (bed->static_tls_alignment == 1)
11434 end = align_power (end,
11435 elf_hash_table (info)->tls_sec->alignment_power);
11436 elf_hash_table (info)->tls_size = end - base;
11439 /* Reorder SHF_LINK_ORDER sections. */
11440 for (o = abfd->sections; o != NULL; o = o->next)
11442 if (!elf_fixup_link_order (abfd, o))
11446 if (!_bfd_elf_fixup_eh_frame_hdr (info))
11449 /* Since ELF permits relocations to be against local symbols, we
11450 must have the local symbols available when we do the relocations.
11451 Since we would rather only read the local symbols once, and we
11452 would rather not keep them in memory, we handle all the
11453 relocations for a single input file at the same time.
11455 Unfortunately, there is no way to know the total number of local
11456 symbols until we have seen all of them, and the local symbol
11457 indices precede the global symbol indices. This means that when
11458 we are generating relocatable output, and we see a reloc against
11459 a global symbol, we can not know the symbol index until we have
11460 finished examining all the local symbols to see which ones we are
11461 going to output. To deal with this, we keep the relocations in
11462 memory, and don't output them until the end of the link. This is
11463 an unfortunate waste of memory, but I don't see a good way around
11464 it. Fortunately, it only happens when performing a relocatable
11465 link, which is not the common case. FIXME: If keep_memory is set
11466 we could write the relocs out and then read them again; I don't
11467 know how bad the memory loss will be. */
11469 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11470 sub->output_has_begun = FALSE;
11471 for (o = abfd->sections; o != NULL; o = o->next)
11473 for (p = o->map_head.link_order; p != NULL; p = p->next)
11475 if (p->type == bfd_indirect_link_order
11476 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
11477 == bfd_target_elf_flavour)
11478 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
11480 if (! sub->output_has_begun)
11482 if (! elf_link_input_bfd (&flinfo, sub))
11484 sub->output_has_begun = TRUE;
11487 else if (p->type == bfd_section_reloc_link_order
11488 || p->type == bfd_symbol_reloc_link_order)
11490 if (! elf_reloc_link_order (abfd, info, o, p))
11495 if (! _bfd_default_link_order (abfd, info, o, p))
11497 if (p->type == bfd_indirect_link_order
11498 && (bfd_get_flavour (sub)
11499 == bfd_target_elf_flavour)
11500 && (elf_elfheader (sub)->e_ident[EI_CLASS]
11501 != bed->s->elfclass))
11503 const char *iclass, *oclass;
11505 switch (bed->s->elfclass)
11507 case ELFCLASS64: oclass = "ELFCLASS64"; break;
11508 case ELFCLASS32: oclass = "ELFCLASS32"; break;
11509 case ELFCLASSNONE: oclass = "ELFCLASSNONE"; break;
11513 switch (elf_elfheader (sub)->e_ident[EI_CLASS])
11515 case ELFCLASS64: iclass = "ELFCLASS64"; break;
11516 case ELFCLASS32: iclass = "ELFCLASS32"; break;
11517 case ELFCLASSNONE: iclass = "ELFCLASSNONE"; break;
11521 bfd_set_error (bfd_error_wrong_format);
11522 (*_bfd_error_handler)
11523 (_("%B: file class %s incompatible with %s"),
11524 sub, iclass, oclass);
11533 /* Free symbol buffer if needed. */
11534 if (!info->reduce_memory_overheads)
11536 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11537 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
11538 && elf_tdata (sub)->symbuf)
11540 free (elf_tdata (sub)->symbuf);
11541 elf_tdata (sub)->symbuf = NULL;
11545 /* Output any global symbols that got converted to local in a
11546 version script or due to symbol visibility. We do this in a
11547 separate step since ELF requires all local symbols to appear
11548 prior to any global symbols. FIXME: We should only do this if
11549 some global symbols were, in fact, converted to become local.
11550 FIXME: Will this work correctly with the Irix 5 linker? */
11551 eoinfo.failed = FALSE;
11552 eoinfo.flinfo = &flinfo;
11553 eoinfo.localsyms = TRUE;
11554 eoinfo.file_sym_done = FALSE;
11555 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11559 /* If backend needs to output some local symbols not present in the hash
11560 table, do it now. */
11561 if (bed->elf_backend_output_arch_local_syms
11562 && (info->strip != strip_all || emit_relocs))
11564 typedef int (*out_sym_func)
11565 (void *, const char *, Elf_Internal_Sym *, asection *,
11566 struct elf_link_hash_entry *);
11568 if (! ((*bed->elf_backend_output_arch_local_syms)
11569 (abfd, info, &flinfo,
11570 (out_sym_func) elf_link_output_symstrtab)))
11574 /* That wrote out all the local symbols. Finish up the symbol table
11575 with the global symbols. Even if we want to strip everything we
11576 can, we still need to deal with those global symbols that got
11577 converted to local in a version script. */
11579 /* The sh_info field records the index of the first non local symbol. */
11580 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11583 && elf_hash_table (info)->dynsym != NULL
11584 && (elf_hash_table (info)->dynsym->output_section
11585 != bfd_abs_section_ptr))
11587 Elf_Internal_Sym sym;
11588 bfd_byte *dynsym = elf_hash_table (info)->dynsym->contents;
11589 long last_local = 0;
11591 /* Write out the section symbols for the output sections. */
11592 if (bfd_link_pic (info)
11593 || elf_hash_table (info)->is_relocatable_executable)
11599 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11601 sym.st_target_internal = 0;
11603 for (s = abfd->sections; s != NULL; s = s->next)
11609 dynindx = elf_section_data (s)->dynindx;
11612 indx = elf_section_data (s)->this_idx;
11613 BFD_ASSERT (indx > 0);
11614 sym.st_shndx = indx;
11615 if (! check_dynsym (abfd, &sym))
11617 sym.st_value = s->vma;
11618 dest = dynsym + dynindx * bed->s->sizeof_sym;
11619 if (last_local < dynindx)
11620 last_local = dynindx;
11621 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11625 /* Write out the local dynsyms. */
11626 if (elf_hash_table (info)->dynlocal)
11628 struct elf_link_local_dynamic_entry *e;
11629 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11634 /* Copy the internal symbol and turn off visibility.
11635 Note that we saved a word of storage and overwrote
11636 the original st_name with the dynstr_index. */
11638 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11640 s = bfd_section_from_elf_index (e->input_bfd,
11645 elf_section_data (s->output_section)->this_idx;
11646 if (! check_dynsym (abfd, &sym))
11648 sym.st_value = (s->output_section->vma
11650 + e->isym.st_value);
11653 if (last_local < e->dynindx)
11654 last_local = e->dynindx;
11656 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11657 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11661 elf_section_data (elf_hash_table (info)->dynsym->output_section)->this_hdr.sh_info =
11665 /* We get the global symbols from the hash table. */
11666 eoinfo.failed = FALSE;
11667 eoinfo.localsyms = FALSE;
11668 eoinfo.flinfo = &flinfo;
11669 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11673 /* If backend needs to output some symbols not present in the hash
11674 table, do it now. */
11675 if (bed->elf_backend_output_arch_syms
11676 && (info->strip != strip_all || emit_relocs))
11678 typedef int (*out_sym_func)
11679 (void *, const char *, Elf_Internal_Sym *, asection *,
11680 struct elf_link_hash_entry *);
11682 if (! ((*bed->elf_backend_output_arch_syms)
11683 (abfd, info, &flinfo,
11684 (out_sym_func) elf_link_output_symstrtab)))
11688 /* Finalize the .strtab section. */
11689 _bfd_elf_strtab_finalize (flinfo.symstrtab);
11691 /* Swap out the .strtab section. */
11692 if (!elf_link_swap_symbols_out (&flinfo))
11695 /* Now we know the size of the symtab section. */
11696 if (bfd_get_symcount (abfd) > 0)
11698 /* Finish up and write out the symbol string table (.strtab)
11700 Elf_Internal_Shdr *symstrtab_hdr;
11701 file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
11703 symtab_shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr;
11704 if (symtab_shndx_hdr != NULL && symtab_shndx_hdr->sh_name != 0)
11706 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11707 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11708 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11709 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11710 symtab_shndx_hdr->sh_size = amt;
11712 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11715 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11716 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11720 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11721 /* sh_name was set in prep_headers. */
11722 symstrtab_hdr->sh_type = SHT_STRTAB;
11723 symstrtab_hdr->sh_flags = bed->elf_strtab_flags;
11724 symstrtab_hdr->sh_addr = 0;
11725 symstrtab_hdr->sh_size = _bfd_elf_strtab_size (flinfo.symstrtab);
11726 symstrtab_hdr->sh_entsize = 0;
11727 symstrtab_hdr->sh_link = 0;
11728 symstrtab_hdr->sh_info = 0;
11729 /* sh_offset is set just below. */
11730 symstrtab_hdr->sh_addralign = 1;
11732 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
11734 elf_next_file_pos (abfd) = off;
11736 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11737 || ! _bfd_elf_strtab_emit (abfd, flinfo.symstrtab))
11741 /* Adjust the relocs to have the correct symbol indices. */
11742 for (o = abfd->sections; o != NULL; o = o->next)
11744 struct bfd_elf_section_data *esdo = elf_section_data (o);
11746 if ((o->flags & SEC_RELOC) == 0)
11749 sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o);
11750 if (esdo->rel.hdr != NULL
11751 && !elf_link_adjust_relocs (abfd, &esdo->rel, sort))
11753 if (esdo->rela.hdr != NULL
11754 && !elf_link_adjust_relocs (abfd, &esdo->rela, sort))
11757 /* Set the reloc_count field to 0 to prevent write_relocs from
11758 trying to swap the relocs out itself. */
11759 o->reloc_count = 0;
11762 if (dynamic && info->combreloc && dynobj != NULL)
11763 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11765 /* If we are linking against a dynamic object, or generating a
11766 shared library, finish up the dynamic linking information. */
11769 bfd_byte *dyncon, *dynconend;
11771 /* Fix up .dynamic entries. */
11772 o = bfd_get_linker_section (dynobj, ".dynamic");
11773 BFD_ASSERT (o != NULL);
11775 dyncon = o->contents;
11776 dynconend = o->contents + o->size;
11777 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11779 Elf_Internal_Dyn dyn;
11783 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11790 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11792 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11794 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11795 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11798 dyn.d_un.d_val = relativecount;
11805 name = info->init_function;
11808 name = info->fini_function;
11811 struct elf_link_hash_entry *h;
11813 h = elf_link_hash_lookup (elf_hash_table (info), name,
11814 FALSE, FALSE, TRUE);
11816 && (h->root.type == bfd_link_hash_defined
11817 || h->root.type == bfd_link_hash_defweak))
11819 dyn.d_un.d_ptr = h->root.u.def.value;
11820 o = h->root.u.def.section;
11821 if (o->output_section != NULL)
11822 dyn.d_un.d_ptr += (o->output_section->vma
11823 + o->output_offset);
11826 /* The symbol is imported from another shared
11827 library and does not apply to this one. */
11828 dyn.d_un.d_ptr = 0;
11835 case DT_PREINIT_ARRAYSZ:
11836 name = ".preinit_array";
11838 case DT_INIT_ARRAYSZ:
11839 name = ".init_array";
11841 case DT_FINI_ARRAYSZ:
11842 name = ".fini_array";
11844 o = bfd_get_section_by_name (abfd, name);
11847 (*_bfd_error_handler)
11848 (_("%B: could not find output section %s"), abfd, name);
11852 (*_bfd_error_handler)
11853 (_("warning: %s section has zero size"), name);
11854 dyn.d_un.d_val = o->size;
11857 case DT_PREINIT_ARRAY:
11858 name = ".preinit_array";
11860 case DT_INIT_ARRAY:
11861 name = ".init_array";
11863 case DT_FINI_ARRAY:
11864 name = ".fini_array";
11871 name = ".gnu.hash";
11880 name = ".gnu.version_d";
11883 name = ".gnu.version_r";
11886 name = ".gnu.version";
11888 o = bfd_get_section_by_name (abfd, name);
11891 (*_bfd_error_handler)
11892 (_("%B: could not find output section %s"), abfd, name);
11895 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11897 (*_bfd_error_handler)
11898 (_("warning: section '%s' is being made into a note"), name);
11899 bfd_set_error (bfd_error_nonrepresentable_section);
11902 dyn.d_un.d_ptr = o->vma;
11909 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11913 dyn.d_un.d_val = 0;
11914 dyn.d_un.d_ptr = 0;
11915 for (i = 1; i < elf_numsections (abfd); i++)
11917 Elf_Internal_Shdr *hdr;
11919 hdr = elf_elfsections (abfd)[i];
11920 if (hdr->sh_type == type
11921 && (hdr->sh_flags & SHF_ALLOC) != 0)
11923 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11924 dyn.d_un.d_val += hdr->sh_size;
11927 if (dyn.d_un.d_ptr == 0
11928 || hdr->sh_addr < dyn.d_un.d_ptr)
11929 dyn.d_un.d_ptr = hdr->sh_addr;
11935 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11939 /* If we have created any dynamic sections, then output them. */
11940 if (dynobj != NULL)
11942 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11945 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11946 if (((info->warn_shared_textrel && bfd_link_pic (info))
11947 || info->error_textrel)
11948 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11950 bfd_byte *dyncon, *dynconend;
11952 dyncon = o->contents;
11953 dynconend = o->contents + o->size;
11954 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11956 Elf_Internal_Dyn dyn;
11958 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11960 if (dyn.d_tag == DT_TEXTREL)
11962 if (info->error_textrel)
11963 info->callbacks->einfo
11964 (_("%P%X: read-only segment has dynamic relocations.\n"));
11966 info->callbacks->einfo
11967 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11973 for (o = dynobj->sections; o != NULL; o = o->next)
11975 if ((o->flags & SEC_HAS_CONTENTS) == 0
11977 || o->output_section == bfd_abs_section_ptr)
11979 if ((o->flags & SEC_LINKER_CREATED) == 0)
11981 /* At this point, we are only interested in sections
11982 created by _bfd_elf_link_create_dynamic_sections. */
11985 if (elf_hash_table (info)->stab_info.stabstr == o)
11987 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11989 if (strcmp (o->name, ".dynstr") != 0)
11991 if (! bfd_set_section_contents (abfd, o->output_section,
11993 (file_ptr) o->output_offset
11994 * bfd_octets_per_byte (abfd),
12000 /* The contents of the .dynstr section are actually in a
12004 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
12005 if (bfd_seek (abfd, off, SEEK_SET) != 0
12006 || ! _bfd_elf_strtab_emit (abfd,
12007 elf_hash_table (info)->dynstr))
12013 if (bfd_link_relocatable (info))
12015 bfd_boolean failed = FALSE;
12017 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
12022 /* If we have optimized stabs strings, output them. */
12023 if (elf_hash_table (info)->stab_info.stabstr != NULL)
12025 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
12029 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
12032 elf_final_link_free (abfd, &flinfo);
12034 elf_linker (abfd) = TRUE;
12038 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
12039 if (contents == NULL)
12040 return FALSE; /* Bail out and fail. */
12041 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
12042 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
12049 elf_final_link_free (abfd, &flinfo);
12053 /* Initialize COOKIE for input bfd ABFD. */
12056 init_reloc_cookie (struct elf_reloc_cookie *cookie,
12057 struct bfd_link_info *info, bfd *abfd)
12059 Elf_Internal_Shdr *symtab_hdr;
12060 const struct elf_backend_data *bed;
12062 bed = get_elf_backend_data (abfd);
12063 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12065 cookie->abfd = abfd;
12066 cookie->sym_hashes = elf_sym_hashes (abfd);
12067 cookie->bad_symtab = elf_bad_symtab (abfd);
12068 if (cookie->bad_symtab)
12070 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12071 cookie->extsymoff = 0;
12075 cookie->locsymcount = symtab_hdr->sh_info;
12076 cookie->extsymoff = symtab_hdr->sh_info;
12079 if (bed->s->arch_size == 32)
12080 cookie->r_sym_shift = 8;
12082 cookie->r_sym_shift = 32;
12084 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
12085 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
12087 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
12088 cookie->locsymcount, 0,
12090 if (cookie->locsyms == NULL)
12092 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
12095 if (info->keep_memory)
12096 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
12101 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
12104 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
12106 Elf_Internal_Shdr *symtab_hdr;
12108 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12109 if (cookie->locsyms != NULL
12110 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
12111 free (cookie->locsyms);
12114 /* Initialize the relocation information in COOKIE for input section SEC
12115 of input bfd ABFD. */
12118 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12119 struct bfd_link_info *info, bfd *abfd,
12122 const struct elf_backend_data *bed;
12124 if (sec->reloc_count == 0)
12126 cookie->rels = NULL;
12127 cookie->relend = NULL;
12131 bed = get_elf_backend_data (abfd);
12133 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
12134 info->keep_memory);
12135 if (cookie->rels == NULL)
12137 cookie->rel = cookie->rels;
12138 cookie->relend = (cookie->rels
12139 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
12141 cookie->rel = cookie->rels;
12145 /* Free the memory allocated by init_reloc_cookie_rels,
12149 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12152 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
12153 free (cookie->rels);
12156 /* Initialize the whole of COOKIE for input section SEC. */
12159 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12160 struct bfd_link_info *info,
12163 if (!init_reloc_cookie (cookie, info, sec->owner))
12165 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
12170 fini_reloc_cookie (cookie, sec->owner);
12175 /* Free the memory allocated by init_reloc_cookie_for_section,
12179 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12182 fini_reloc_cookie_rels (cookie, sec);
12183 fini_reloc_cookie (cookie, sec->owner);
12186 /* Garbage collect unused sections. */
12188 /* Default gc_mark_hook. */
12191 _bfd_elf_gc_mark_hook (asection *sec,
12192 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12193 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
12194 struct elf_link_hash_entry *h,
12195 Elf_Internal_Sym *sym)
12199 switch (h->root.type)
12201 case bfd_link_hash_defined:
12202 case bfd_link_hash_defweak:
12203 return h->root.u.def.section;
12205 case bfd_link_hash_common:
12206 return h->root.u.c.p->section;
12213 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
12218 /* COOKIE->rel describes a relocation against section SEC, which is
12219 a section we've decided to keep. Return the section that contains
12220 the relocation symbol, or NULL if no section contains it. */
12223 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
12224 elf_gc_mark_hook_fn gc_mark_hook,
12225 struct elf_reloc_cookie *cookie,
12226 bfd_boolean *start_stop)
12228 unsigned long r_symndx;
12229 struct elf_link_hash_entry *h;
12231 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
12232 if (r_symndx == STN_UNDEF)
12235 if (r_symndx >= cookie->locsymcount
12236 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12238 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
12241 info->callbacks->einfo (_("%F%P: corrupt input: %B\n"),
12245 while (h->root.type == bfd_link_hash_indirect
12246 || h->root.type == bfd_link_hash_warning)
12247 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12249 /* If this symbol is weak and there is a non-weak definition, we
12250 keep the non-weak definition because many backends put
12251 dynamic reloc info on the non-weak definition for code
12252 handling copy relocs. */
12253 if (h->u.weakdef != NULL)
12254 h->u.weakdef->mark = 1;
12256 if (start_stop != NULL
12257 && (h->root.type == bfd_link_hash_undefined
12258 || h->root.type == bfd_link_hash_undefweak))
12260 /* To work around a glibc bug, mark all XXX input sections
12261 when there is an as yet undefined reference to __start_XXX
12262 or __stop_XXX symbols. The linker will later define such
12263 symbols for orphan input sections that have a name
12264 representable as a C identifier. */
12265 const char *sec_name = NULL;
12266 if (strncmp (h->root.root.string, "__start_", 8) == 0)
12267 sec_name = h->root.root.string + 8;
12268 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
12269 sec_name = h->root.root.string + 7;
12271 if (sec_name != NULL && *sec_name != '\0')
12275 for (i = info->input_bfds; i != NULL; i = i->link.next)
12277 asection *s = bfd_get_section_by_name (i, sec_name);
12278 if (s != NULL && !s->gc_mark)
12280 *start_stop = TRUE;
12287 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
12290 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
12291 &cookie->locsyms[r_symndx]);
12294 /* COOKIE->rel describes a relocation against section SEC, which is
12295 a section we've decided to keep. Mark the section that contains
12296 the relocation symbol. */
12299 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
12301 elf_gc_mark_hook_fn gc_mark_hook,
12302 struct elf_reloc_cookie *cookie)
12305 bfd_boolean start_stop = FALSE;
12307 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie, &start_stop);
12308 while (rsec != NULL)
12310 if (!rsec->gc_mark)
12312 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
12313 || (rsec->owner->flags & DYNAMIC) != 0)
12315 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
12320 rsec = bfd_get_next_section_by_name (rsec->owner, rsec);
12325 /* The mark phase of garbage collection. For a given section, mark
12326 it and any sections in this section's group, and all the sections
12327 which define symbols to which it refers. */
12330 _bfd_elf_gc_mark (struct bfd_link_info *info,
12332 elf_gc_mark_hook_fn gc_mark_hook)
12335 asection *group_sec, *eh_frame;
12339 /* Mark all the sections in the group. */
12340 group_sec = elf_section_data (sec)->next_in_group;
12341 if (group_sec && !group_sec->gc_mark)
12342 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
12345 /* Look through the section relocs. */
12347 eh_frame = elf_eh_frame_section (sec->owner);
12348 if ((sec->flags & SEC_RELOC) != 0
12349 && sec->reloc_count > 0
12350 && sec != eh_frame)
12352 struct elf_reloc_cookie cookie;
12354 if (!init_reloc_cookie_for_section (&cookie, info, sec))
12358 for (; cookie.rel < cookie.relend; cookie.rel++)
12359 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
12364 fini_reloc_cookie_for_section (&cookie, sec);
12368 if (ret && eh_frame && elf_fde_list (sec))
12370 struct elf_reloc_cookie cookie;
12372 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
12376 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
12377 gc_mark_hook, &cookie))
12379 fini_reloc_cookie_for_section (&cookie, eh_frame);
12383 eh_frame = elf_section_eh_frame_entry (sec);
12384 if (ret && eh_frame && !eh_frame->gc_mark)
12385 if (!_bfd_elf_gc_mark (info, eh_frame, gc_mark_hook))
12391 /* Scan and mark sections in a special or debug section group. */
12394 _bfd_elf_gc_mark_debug_special_section_group (asection *grp)
12396 /* Point to first section of section group. */
12398 /* Used to iterate the section group. */
12401 bfd_boolean is_special_grp = TRUE;
12402 bfd_boolean is_debug_grp = TRUE;
12404 /* First scan to see if group contains any section other than debug
12405 and special section. */
12406 ssec = msec = elf_next_in_group (grp);
12409 if ((msec->flags & SEC_DEBUGGING) == 0)
12410 is_debug_grp = FALSE;
12412 if ((msec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) != 0)
12413 is_special_grp = FALSE;
12415 msec = elf_next_in_group (msec);
12417 while (msec != ssec);
12419 /* If this is a pure debug section group or pure special section group,
12420 keep all sections in this group. */
12421 if (is_debug_grp || is_special_grp)
12426 msec = elf_next_in_group (msec);
12428 while (msec != ssec);
12432 /* Keep debug and special sections. */
12435 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
12436 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
12440 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12443 bfd_boolean some_kept;
12444 bfd_boolean debug_frag_seen;
12446 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12449 /* Ensure all linker created sections are kept,
12450 see if any other section is already marked,
12451 and note if we have any fragmented debug sections. */
12452 debug_frag_seen = some_kept = FALSE;
12453 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12455 if ((isec->flags & SEC_LINKER_CREATED) != 0)
12457 else if (isec->gc_mark)
12460 if (debug_frag_seen == FALSE
12461 && (isec->flags & SEC_DEBUGGING)
12462 && CONST_STRNEQ (isec->name, ".debug_line."))
12463 debug_frag_seen = TRUE;
12466 /* If no section in this file will be kept, then we can
12467 toss out the debug and special sections. */
12471 /* Keep debug and special sections like .comment when they are
12472 not part of a group. Also keep section groups that contain
12473 just debug sections or special sections. */
12474 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12476 if ((isec->flags & SEC_GROUP) != 0)
12477 _bfd_elf_gc_mark_debug_special_section_group (isec);
12478 else if (((isec->flags & SEC_DEBUGGING) != 0
12479 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
12480 && elf_next_in_group (isec) == NULL)
12484 if (! debug_frag_seen)
12487 /* Look for CODE sections which are going to be discarded,
12488 and find and discard any fragmented debug sections which
12489 are associated with that code section. */
12490 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12491 if ((isec->flags & SEC_CODE) != 0
12492 && isec->gc_mark == 0)
12497 ilen = strlen (isec->name);
12499 /* Association is determined by the name of the debug section
12500 containing the name of the code section as a suffix. For
12501 example .debug_line.text.foo is a debug section associated
12503 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
12507 if (dsec->gc_mark == 0
12508 || (dsec->flags & SEC_DEBUGGING) == 0)
12511 dlen = strlen (dsec->name);
12514 && strncmp (dsec->name + (dlen - ilen),
12515 isec->name, ilen) == 0)
12525 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
12527 struct elf_gc_sweep_symbol_info
12529 struct bfd_link_info *info;
12530 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
12535 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
12538 && (((h->root.type == bfd_link_hash_defined
12539 || h->root.type == bfd_link_hash_defweak)
12540 && !((h->def_regular || ELF_COMMON_DEF_P (h))
12541 && h->root.u.def.section->gc_mark))
12542 || h->root.type == bfd_link_hash_undefined
12543 || h->root.type == bfd_link_hash_undefweak))
12545 struct elf_gc_sweep_symbol_info *inf;
12547 inf = (struct elf_gc_sweep_symbol_info *) data;
12548 (*inf->hide_symbol) (inf->info, h, TRUE);
12549 h->def_regular = 0;
12550 h->ref_regular = 0;
12551 h->ref_regular_nonweak = 0;
12557 /* The sweep phase of garbage collection. Remove all garbage sections. */
12559 typedef bfd_boolean (*gc_sweep_hook_fn)
12560 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
12563 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
12566 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12567 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
12568 unsigned long section_sym_count;
12569 struct elf_gc_sweep_symbol_info sweep_info;
12571 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12575 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12576 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12579 for (o = sub->sections; o != NULL; o = o->next)
12581 /* When any section in a section group is kept, we keep all
12582 sections in the section group. If the first member of
12583 the section group is excluded, we will also exclude the
12585 if (o->flags & SEC_GROUP)
12587 asection *first = elf_next_in_group (o);
12588 o->gc_mark = first->gc_mark;
12594 /* Skip sweeping sections already excluded. */
12595 if (o->flags & SEC_EXCLUDE)
12598 /* Since this is early in the link process, it is simple
12599 to remove a section from the output. */
12600 o->flags |= SEC_EXCLUDE;
12602 if (info->print_gc_sections && o->size != 0)
12603 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
12605 /* But we also have to update some of the relocation
12606 info we collected before. */
12608 && (o->flags & SEC_RELOC) != 0
12609 && o->reloc_count != 0
12610 && !((info->strip == strip_all || info->strip == strip_debugger)
12611 && (o->flags & SEC_DEBUGGING) != 0)
12612 && !bfd_is_abs_section (o->output_section))
12614 Elf_Internal_Rela *internal_relocs;
12618 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
12619 info->keep_memory);
12620 if (internal_relocs == NULL)
12623 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
12625 if (elf_section_data (o)->relocs != internal_relocs)
12626 free (internal_relocs);
12634 /* Remove the symbols that were in the swept sections from the dynamic
12635 symbol table. GCFIXME: Anyone know how to get them out of the
12636 static symbol table as well? */
12637 sweep_info.info = info;
12638 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
12639 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
12642 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
12646 /* Propagate collected vtable information. This is called through
12647 elf_link_hash_traverse. */
12650 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
12652 /* Those that are not vtables. */
12653 if (h->vtable == NULL || h->vtable->parent == NULL)
12656 /* Those vtables that do not have parents, we cannot merge. */
12657 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12660 /* If we've already been done, exit. */
12661 if (h->vtable->used && h->vtable->used[-1])
12664 /* Make sure the parent's table is up to date. */
12665 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12667 if (h->vtable->used == NULL)
12669 /* None of this table's entries were referenced. Re-use the
12671 h->vtable->used = h->vtable->parent->vtable->used;
12672 h->vtable->size = h->vtable->parent->vtable->size;
12677 bfd_boolean *cu, *pu;
12679 /* Or the parent's entries into ours. */
12680 cu = h->vtable->used;
12682 pu = h->vtable->parent->vtable->used;
12685 const struct elf_backend_data *bed;
12686 unsigned int log_file_align;
12688 bed = get_elf_backend_data (h->root.u.def.section->owner);
12689 log_file_align = bed->s->log_file_align;
12690 n = h->vtable->parent->vtable->size >> log_file_align;
12705 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12708 bfd_vma hstart, hend;
12709 Elf_Internal_Rela *relstart, *relend, *rel;
12710 const struct elf_backend_data *bed;
12711 unsigned int log_file_align;
12713 /* Take care of both those symbols that do not describe vtables as
12714 well as those that are not loaded. */
12715 if (h->vtable == NULL || h->vtable->parent == NULL)
12718 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12719 || h->root.type == bfd_link_hash_defweak);
12721 sec = h->root.u.def.section;
12722 hstart = h->root.u.def.value;
12723 hend = hstart + h->size;
12725 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12727 return *(bfd_boolean *) okp = FALSE;
12728 bed = get_elf_backend_data (sec->owner);
12729 log_file_align = bed->s->log_file_align;
12731 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12733 for (rel = relstart; rel < relend; ++rel)
12734 if (rel->r_offset >= hstart && rel->r_offset < hend)
12736 /* If the entry is in use, do nothing. */
12737 if (h->vtable->used
12738 && (rel->r_offset - hstart) < h->vtable->size)
12740 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12741 if (h->vtable->used[entry])
12744 /* Otherwise, kill it. */
12745 rel->r_offset = rel->r_info = rel->r_addend = 0;
12751 /* Mark sections containing dynamically referenced symbols. When
12752 building shared libraries, we must assume that any visible symbol is
12756 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12758 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12759 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12761 if ((h->root.type == bfd_link_hash_defined
12762 || h->root.type == bfd_link_hash_defweak)
12764 || ((h->def_regular || ELF_COMMON_DEF_P (h))
12765 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12766 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12767 && (!bfd_link_executable (info)
12768 || info->export_dynamic
12771 && (*d->match) (&d->head, NULL, h->root.root.string)))
12772 && (h->versioned >= versioned
12773 || !bfd_hide_sym_by_version (info->version_info,
12774 h->root.root.string)))))
12775 h->root.u.def.section->flags |= SEC_KEEP;
12780 /* Keep all sections containing symbols undefined on the command-line,
12781 and the section containing the entry symbol. */
12784 _bfd_elf_gc_keep (struct bfd_link_info *info)
12786 struct bfd_sym_chain *sym;
12788 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12790 struct elf_link_hash_entry *h;
12792 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12793 FALSE, FALSE, FALSE);
12796 && (h->root.type == bfd_link_hash_defined
12797 || h->root.type == bfd_link_hash_defweak)
12798 && !bfd_is_abs_section (h->root.u.def.section))
12799 h->root.u.def.section->flags |= SEC_KEEP;
12804 bfd_elf_parse_eh_frame_entries (bfd *abfd ATTRIBUTE_UNUSED,
12805 struct bfd_link_info *info)
12807 bfd *ibfd = info->input_bfds;
12809 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12812 struct elf_reloc_cookie cookie;
12814 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12817 if (!init_reloc_cookie (&cookie, info, ibfd))
12820 for (sec = ibfd->sections; sec; sec = sec->next)
12822 if (CONST_STRNEQ (bfd_section_name (ibfd, sec), ".eh_frame_entry")
12823 && init_reloc_cookie_rels (&cookie, info, ibfd, sec))
12825 _bfd_elf_parse_eh_frame_entry (info, sec, &cookie);
12826 fini_reloc_cookie_rels (&cookie, sec);
12833 /* Do mark and sweep of unused sections. */
12836 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12838 bfd_boolean ok = TRUE;
12840 elf_gc_mark_hook_fn gc_mark_hook;
12841 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12842 struct elf_link_hash_table *htab;
12844 if (!bed->can_gc_sections
12845 || !is_elf_hash_table (info->hash))
12847 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12851 bed->gc_keep (info);
12852 htab = elf_hash_table (info);
12854 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12855 at the .eh_frame section if we can mark the FDEs individually. */
12856 for (sub = info->input_bfds;
12857 info->eh_frame_hdr_type != COMPACT_EH_HDR && sub != NULL;
12858 sub = sub->link.next)
12861 struct elf_reloc_cookie cookie;
12863 sec = bfd_get_section_by_name (sub, ".eh_frame");
12864 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12866 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12867 if (elf_section_data (sec)->sec_info
12868 && (sec->flags & SEC_LINKER_CREATED) == 0)
12869 elf_eh_frame_section (sub) = sec;
12870 fini_reloc_cookie_for_section (&cookie, sec);
12871 sec = bfd_get_next_section_by_name (NULL, sec);
12875 /* Apply transitive closure to the vtable entry usage info. */
12876 elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
12880 /* Kill the vtable relocations that were not used. */
12881 elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
12885 /* Mark dynamically referenced symbols. */
12886 if (htab->dynamic_sections_created)
12887 elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
12889 /* Grovel through relocs to find out who stays ... */
12890 gc_mark_hook = bed->gc_mark_hook;
12891 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12895 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12896 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12899 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12900 Also treat note sections as a root, if the section is not part
12902 for (o = sub->sections; o != NULL; o = o->next)
12904 && (o->flags & SEC_EXCLUDE) == 0
12905 && ((o->flags & SEC_KEEP) != 0
12906 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12907 && elf_next_in_group (o) == NULL )))
12909 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12914 /* Allow the backend to mark additional target specific sections. */
12915 bed->gc_mark_extra_sections (info, gc_mark_hook);
12917 /* ... and mark SEC_EXCLUDE for those that go. */
12918 return elf_gc_sweep (abfd, info);
12921 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12924 bfd_elf_gc_record_vtinherit (bfd *abfd,
12926 struct elf_link_hash_entry *h,
12929 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12930 struct elf_link_hash_entry **search, *child;
12931 bfd_size_type extsymcount;
12932 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12934 /* The sh_info field of the symtab header tells us where the
12935 external symbols start. We don't care about the local symbols at
12937 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12938 if (!elf_bad_symtab (abfd))
12939 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12941 sym_hashes = elf_sym_hashes (abfd);
12942 sym_hashes_end = sym_hashes + extsymcount;
12944 /* Hunt down the child symbol, which is in this section at the same
12945 offset as the relocation. */
12946 for (search = sym_hashes; search != sym_hashes_end; ++search)
12948 if ((child = *search) != NULL
12949 && (child->root.type == bfd_link_hash_defined
12950 || child->root.type == bfd_link_hash_defweak)
12951 && child->root.u.def.section == sec
12952 && child->root.u.def.value == offset)
12956 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12957 abfd, sec, (unsigned long) offset);
12958 bfd_set_error (bfd_error_invalid_operation);
12962 if (!child->vtable)
12964 child->vtable = ((struct elf_link_virtual_table_entry *)
12965 bfd_zalloc (abfd, sizeof (*child->vtable)));
12966 if (!child->vtable)
12971 /* This *should* only be the absolute section. It could potentially
12972 be that someone has defined a non-global vtable though, which
12973 would be bad. It isn't worth paging in the local symbols to be
12974 sure though; that case should simply be handled by the assembler. */
12976 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12979 child->vtable->parent = h;
12984 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12987 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12988 asection *sec ATTRIBUTE_UNUSED,
12989 struct elf_link_hash_entry *h,
12992 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12993 unsigned int log_file_align = bed->s->log_file_align;
12997 h->vtable = ((struct elf_link_virtual_table_entry *)
12998 bfd_zalloc (abfd, sizeof (*h->vtable)));
13003 if (addend >= h->vtable->size)
13005 size_t size, bytes, file_align;
13006 bfd_boolean *ptr = h->vtable->used;
13008 /* While the symbol is undefined, we have to be prepared to handle
13010 file_align = 1 << log_file_align;
13011 if (h->root.type == bfd_link_hash_undefined)
13012 size = addend + file_align;
13016 if (addend >= size)
13018 /* Oops! We've got a reference past the defined end of
13019 the table. This is probably a bug -- shall we warn? */
13020 size = addend + file_align;
13023 size = (size + file_align - 1) & -file_align;
13025 /* Allocate one extra entry for use as a "done" flag for the
13026 consolidation pass. */
13027 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
13031 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
13037 oldbytes = (((h->vtable->size >> log_file_align) + 1)
13038 * sizeof (bfd_boolean));
13039 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
13043 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
13048 /* And arrange for that done flag to be at index -1. */
13049 h->vtable->used = ptr + 1;
13050 h->vtable->size = size;
13053 h->vtable->used[addend >> log_file_align] = TRUE;
13058 /* Map an ELF section header flag to its corresponding string. */
13062 flagword flag_value;
13063 } elf_flags_to_name_table;
13065 static elf_flags_to_name_table elf_flags_to_names [] =
13067 { "SHF_WRITE", SHF_WRITE },
13068 { "SHF_ALLOC", SHF_ALLOC },
13069 { "SHF_EXECINSTR", SHF_EXECINSTR },
13070 { "SHF_MERGE", SHF_MERGE },
13071 { "SHF_STRINGS", SHF_STRINGS },
13072 { "SHF_INFO_LINK", SHF_INFO_LINK},
13073 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
13074 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
13075 { "SHF_GROUP", SHF_GROUP },
13076 { "SHF_TLS", SHF_TLS },
13077 { "SHF_MASKOS", SHF_MASKOS },
13078 { "SHF_EXCLUDE", SHF_EXCLUDE },
13081 /* Returns TRUE if the section is to be included, otherwise FALSE. */
13083 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
13084 struct flag_info *flaginfo,
13087 const bfd_vma sh_flags = elf_section_flags (section);
13089 if (!flaginfo->flags_initialized)
13091 bfd *obfd = info->output_bfd;
13092 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13093 struct flag_info_list *tf = flaginfo->flag_list;
13095 int without_hex = 0;
13097 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
13100 flagword (*lookup) (char *);
13102 lookup = bed->elf_backend_lookup_section_flags_hook;
13103 if (lookup != NULL)
13105 flagword hexval = (*lookup) ((char *) tf->name);
13109 if (tf->with == with_flags)
13110 with_hex |= hexval;
13111 else if (tf->with == without_flags)
13112 without_hex |= hexval;
13117 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
13119 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
13121 if (tf->with == with_flags)
13122 with_hex |= elf_flags_to_names[i].flag_value;
13123 else if (tf->with == without_flags)
13124 without_hex |= elf_flags_to_names[i].flag_value;
13131 info->callbacks->einfo
13132 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
13136 flaginfo->flags_initialized = TRUE;
13137 flaginfo->only_with_flags |= with_hex;
13138 flaginfo->not_with_flags |= without_hex;
13141 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
13144 if ((flaginfo->not_with_flags & sh_flags) != 0)
13150 struct alloc_got_off_arg {
13152 struct bfd_link_info *info;
13155 /* We need a special top-level link routine to convert got reference counts
13156 to real got offsets. */
13159 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
13161 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
13162 bfd *obfd = gofarg->info->output_bfd;
13163 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13165 if (h->got.refcount > 0)
13167 h->got.offset = gofarg->gotoff;
13168 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
13171 h->got.offset = (bfd_vma) -1;
13176 /* And an accompanying bit to work out final got entry offsets once
13177 we're done. Should be called from final_link. */
13180 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
13181 struct bfd_link_info *info)
13184 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13186 struct alloc_got_off_arg gofarg;
13188 BFD_ASSERT (abfd == info->output_bfd);
13190 if (! is_elf_hash_table (info->hash))
13193 /* The GOT offset is relative to the .got section, but the GOT header is
13194 put into the .got.plt section, if the backend uses it. */
13195 if (bed->want_got_plt)
13198 gotoff = bed->got_header_size;
13200 /* Do the local .got entries first. */
13201 for (i = info->input_bfds; i; i = i->link.next)
13203 bfd_signed_vma *local_got;
13204 bfd_size_type j, locsymcount;
13205 Elf_Internal_Shdr *symtab_hdr;
13207 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
13210 local_got = elf_local_got_refcounts (i);
13214 symtab_hdr = &elf_tdata (i)->symtab_hdr;
13215 if (elf_bad_symtab (i))
13216 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
13218 locsymcount = symtab_hdr->sh_info;
13220 for (j = 0; j < locsymcount; ++j)
13222 if (local_got[j] > 0)
13224 local_got[j] = gotoff;
13225 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
13228 local_got[j] = (bfd_vma) -1;
13232 /* Then the global .got entries. .plt refcounts are handled by
13233 adjust_dynamic_symbol */
13234 gofarg.gotoff = gotoff;
13235 gofarg.info = info;
13236 elf_link_hash_traverse (elf_hash_table (info),
13237 elf_gc_allocate_got_offsets,
13242 /* Many folk need no more in the way of final link than this, once
13243 got entry reference counting is enabled. */
13246 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
13248 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
13251 /* Invoke the regular ELF backend linker to do all the work. */
13252 return bfd_elf_final_link (abfd, info);
13256 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
13258 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
13260 if (rcookie->bad_symtab)
13261 rcookie->rel = rcookie->rels;
13263 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
13265 unsigned long r_symndx;
13267 if (! rcookie->bad_symtab)
13268 if (rcookie->rel->r_offset > offset)
13270 if (rcookie->rel->r_offset != offset)
13273 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
13274 if (r_symndx == STN_UNDEF)
13277 if (r_symndx >= rcookie->locsymcount
13278 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
13280 struct elf_link_hash_entry *h;
13282 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
13284 while (h->root.type == bfd_link_hash_indirect
13285 || h->root.type == bfd_link_hash_warning)
13286 h = (struct elf_link_hash_entry *) h->root.u.i.link;
13288 if ((h->root.type == bfd_link_hash_defined
13289 || h->root.type == bfd_link_hash_defweak)
13290 && (h->root.u.def.section->owner != rcookie->abfd
13291 || h->root.u.def.section->kept_section != NULL
13292 || discarded_section (h->root.u.def.section)))
13297 /* It's not a relocation against a global symbol,
13298 but it could be a relocation against a local
13299 symbol for a discarded section. */
13301 Elf_Internal_Sym *isym;
13303 /* Need to: get the symbol; get the section. */
13304 isym = &rcookie->locsyms[r_symndx];
13305 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
13307 && (isec->kept_section != NULL
13308 || discarded_section (isec)))
13316 /* Discard unneeded references to discarded sections.
13317 Returns -1 on error, 1 if any section's size was changed, 0 if
13318 nothing changed. This function assumes that the relocations are in
13319 sorted order, which is true for all known assemblers. */
13322 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
13324 struct elf_reloc_cookie cookie;
13329 if (info->traditional_format
13330 || !is_elf_hash_table (info->hash))
13333 o = bfd_get_section_by_name (output_bfd, ".stab");
13338 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
13341 || i->reloc_count == 0
13342 || i->sec_info_type != SEC_INFO_TYPE_STABS)
13346 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13349 if (!init_reloc_cookie_for_section (&cookie, info, i))
13352 if (_bfd_discard_section_stabs (abfd, i,
13353 elf_section_data (i)->sec_info,
13354 bfd_elf_reloc_symbol_deleted_p,
13358 fini_reloc_cookie_for_section (&cookie, i);
13363 if (info->eh_frame_hdr_type != COMPACT_EH_HDR)
13364 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
13369 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
13375 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13378 if (!init_reloc_cookie_for_section (&cookie, info, i))
13381 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
13382 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
13383 bfd_elf_reloc_symbol_deleted_p,
13387 fini_reloc_cookie_for_section (&cookie, i);
13391 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
13393 const struct elf_backend_data *bed;
13395 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13398 bed = get_elf_backend_data (abfd);
13400 if (bed->elf_backend_discard_info != NULL)
13402 if (!init_reloc_cookie (&cookie, info, abfd))
13405 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
13408 fini_reloc_cookie (&cookie, abfd);
13412 if (info->eh_frame_hdr_type == COMPACT_EH_HDR)
13413 _bfd_elf_end_eh_frame_parsing (info);
13415 if (info->eh_frame_hdr_type
13416 && !bfd_link_relocatable (info)
13417 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
13424 _bfd_elf_section_already_linked (bfd *abfd,
13426 struct bfd_link_info *info)
13429 const char *name, *key;
13430 struct bfd_section_already_linked *l;
13431 struct bfd_section_already_linked_hash_entry *already_linked_list;
13433 if (sec->output_section == bfd_abs_section_ptr)
13436 flags = sec->flags;
13438 /* Return if it isn't a linkonce section. A comdat group section
13439 also has SEC_LINK_ONCE set. */
13440 if ((flags & SEC_LINK_ONCE) == 0)
13443 /* Don't put group member sections on our list of already linked
13444 sections. They are handled as a group via their group section. */
13445 if (elf_sec_group (sec) != NULL)
13448 /* For a SHT_GROUP section, use the group signature as the key. */
13450 if ((flags & SEC_GROUP) != 0
13451 && elf_next_in_group (sec) != NULL
13452 && elf_group_name (elf_next_in_group (sec)) != NULL)
13453 key = elf_group_name (elf_next_in_group (sec));
13456 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
13457 if (CONST_STRNEQ (name, ".gnu.linkonce.")
13458 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
13461 /* Must be a user linkonce section that doesn't follow gcc's
13462 naming convention. In this case we won't be matching
13463 single member groups. */
13467 already_linked_list = bfd_section_already_linked_table_lookup (key);
13469 for (l = already_linked_list->entry; l != NULL; l = l->next)
13471 /* We may have 2 different types of sections on the list: group
13472 sections with a signature of <key> (<key> is some string),
13473 and linkonce sections named .gnu.linkonce.<type>.<key>.
13474 Match like sections. LTO plugin sections are an exception.
13475 They are always named .gnu.linkonce.t.<key> and match either
13476 type of section. */
13477 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
13478 && ((flags & SEC_GROUP) != 0
13479 || strcmp (name, l->sec->name) == 0))
13480 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
13482 /* The section has already been linked. See if we should
13483 issue a warning. */
13484 if (!_bfd_handle_already_linked (sec, l, info))
13487 if (flags & SEC_GROUP)
13489 asection *first = elf_next_in_group (sec);
13490 asection *s = first;
13494 s->output_section = bfd_abs_section_ptr;
13495 /* Record which group discards it. */
13496 s->kept_section = l->sec;
13497 s = elf_next_in_group (s);
13498 /* These lists are circular. */
13508 /* A single member comdat group section may be discarded by a
13509 linkonce section and vice versa. */
13510 if ((flags & SEC_GROUP) != 0)
13512 asection *first = elf_next_in_group (sec);
13514 if (first != NULL && elf_next_in_group (first) == first)
13515 /* Check this single member group against linkonce sections. */
13516 for (l = already_linked_list->entry; l != NULL; l = l->next)
13517 if ((l->sec->flags & SEC_GROUP) == 0
13518 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
13520 first->output_section = bfd_abs_section_ptr;
13521 first->kept_section = l->sec;
13522 sec->output_section = bfd_abs_section_ptr;
13527 /* Check this linkonce section against single member groups. */
13528 for (l = already_linked_list->entry; l != NULL; l = l->next)
13529 if (l->sec->flags & SEC_GROUP)
13531 asection *first = elf_next_in_group (l->sec);
13534 && elf_next_in_group (first) == first
13535 && bfd_elf_match_symbols_in_sections (first, sec, info))
13537 sec->output_section = bfd_abs_section_ptr;
13538 sec->kept_section = first;
13543 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
13544 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
13545 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
13546 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
13547 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
13548 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
13549 `.gnu.linkonce.t.F' section from a different bfd not requiring any
13550 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
13551 The reverse order cannot happen as there is never a bfd with only the
13552 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
13553 matter as here were are looking only for cross-bfd sections. */
13555 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
13556 for (l = already_linked_list->entry; l != NULL; l = l->next)
13557 if ((l->sec->flags & SEC_GROUP) == 0
13558 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
13560 if (abfd != l->sec->owner)
13561 sec->output_section = bfd_abs_section_ptr;
13565 /* This is the first section with this name. Record it. */
13566 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
13567 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
13568 return sec->output_section == bfd_abs_section_ptr;
13572 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
13574 return sym->st_shndx == SHN_COMMON;
13578 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
13584 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
13586 return bfd_com_section_ptr;
13590 _bfd_elf_default_got_elt_size (bfd *abfd,
13591 struct bfd_link_info *info ATTRIBUTE_UNUSED,
13592 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
13593 bfd *ibfd ATTRIBUTE_UNUSED,
13594 unsigned long symndx ATTRIBUTE_UNUSED)
13596 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13597 return bed->s->arch_size / 8;
13600 /* Routines to support the creation of dynamic relocs. */
13602 /* Returns the name of the dynamic reloc section associated with SEC. */
13604 static const char *
13605 get_dynamic_reloc_section_name (bfd * abfd,
13607 bfd_boolean is_rela)
13610 const char *old_name = bfd_get_section_name (NULL, sec);
13611 const char *prefix = is_rela ? ".rela" : ".rel";
13613 if (old_name == NULL)
13616 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
13617 sprintf (name, "%s%s", prefix, old_name);
13622 /* Returns the dynamic reloc section associated with SEC.
13623 If necessary compute the name of the dynamic reloc section based
13624 on SEC's name (looked up in ABFD's string table) and the setting
13628 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
13630 bfd_boolean is_rela)
13632 asection * reloc_sec = elf_section_data (sec)->sreloc;
13634 if (reloc_sec == NULL)
13636 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13640 reloc_sec = bfd_get_linker_section (abfd, name);
13642 if (reloc_sec != NULL)
13643 elf_section_data (sec)->sreloc = reloc_sec;
13650 /* Returns the dynamic reloc section associated with SEC. If the
13651 section does not exist it is created and attached to the DYNOBJ
13652 bfd and stored in the SRELOC field of SEC's elf_section_data
13655 ALIGNMENT is the alignment for the newly created section and
13656 IS_RELA defines whether the name should be .rela.<SEC's name>
13657 or .rel.<SEC's name>. The section name is looked up in the
13658 string table associated with ABFD. */
13661 _bfd_elf_make_dynamic_reloc_section (asection *sec,
13663 unsigned int alignment,
13665 bfd_boolean is_rela)
13667 asection * reloc_sec = elf_section_data (sec)->sreloc;
13669 if (reloc_sec == NULL)
13671 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13676 reloc_sec = bfd_get_linker_section (dynobj, name);
13678 if (reloc_sec == NULL)
13680 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
13681 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
13682 if ((sec->flags & SEC_ALLOC) != 0)
13683 flags |= SEC_ALLOC | SEC_LOAD;
13685 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13686 if (reloc_sec != NULL)
13688 /* _bfd_elf_get_sec_type_attr chooses a section type by
13689 name. Override as it may be wrong, eg. for a user
13690 section named "auto" we'll get ".relauto" which is
13691 seen to be a .rela section. */
13692 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13693 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13698 elf_section_data (sec)->sreloc = reloc_sec;
13704 /* Copy the ELF symbol type and other attributes for a linker script
13705 assignment from HSRC to HDEST. Generally this should be treated as
13706 if we found a strong non-dynamic definition for HDEST (except that
13707 ld ignores multiple definition errors). */
13709 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13710 struct bfd_link_hash_entry *hdest,
13711 struct bfd_link_hash_entry *hsrc)
13713 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13714 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13715 Elf_Internal_Sym isym;
13717 ehdest->type = ehsrc->type;
13718 ehdest->target_internal = ehsrc->target_internal;
13720 isym.st_other = ehsrc->other;
13721 elf_merge_st_other (abfd, ehdest, &isym, NULL, TRUE, FALSE);
13724 /* Append a RELA relocation REL to section S in BFD. */
13727 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13729 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13730 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13731 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13732 bed->s->swap_reloca_out (abfd, rel, loc);
13735 /* Append a REL relocation REL to section S in BFD. */
13738 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13740 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13741 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13742 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13743 bed->s->swap_reloc_out (abfd, rel, loc);