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 /* Don't check relocations in excluded sections. */
3522 if ((o->flags & SEC_RELOC) == 0
3523 || (o->flags & SEC_EXCLUDE) != 0
3524 || o->reloc_count == 0
3525 || ((info->strip == strip_all || info->strip == strip_debugger)
3526 && (o->flags & SEC_DEBUGGING) != 0)
3527 || bfd_is_abs_section (o->output_section))
3530 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
3532 if (internal_relocs == NULL)
3535 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
3537 if (elf_section_data (o)->relocs != internal_relocs)
3538 free (internal_relocs);
3548 /* Add symbols from an ELF object file to the linker hash table. */
3551 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3553 Elf_Internal_Ehdr *ehdr;
3554 Elf_Internal_Shdr *hdr;
3555 bfd_size_type symcount;
3556 bfd_size_type extsymcount;
3557 bfd_size_type extsymoff;
3558 struct elf_link_hash_entry **sym_hash;
3559 bfd_boolean dynamic;
3560 Elf_External_Versym *extversym = NULL;
3561 Elf_External_Versym *ever;
3562 struct elf_link_hash_entry *weaks;
3563 struct elf_link_hash_entry **nondeflt_vers = NULL;
3564 bfd_size_type nondeflt_vers_cnt = 0;
3565 Elf_Internal_Sym *isymbuf = NULL;
3566 Elf_Internal_Sym *isym;
3567 Elf_Internal_Sym *isymend;
3568 const struct elf_backend_data *bed;
3569 bfd_boolean add_needed;
3570 struct elf_link_hash_table *htab;
3572 void *alloc_mark = NULL;
3573 struct bfd_hash_entry **old_table = NULL;
3574 unsigned int old_size = 0;
3575 unsigned int old_count = 0;
3576 void *old_tab = NULL;
3578 struct bfd_link_hash_entry *old_undefs = NULL;
3579 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3580 long old_dynsymcount = 0;
3581 bfd_size_type old_dynstr_size = 0;
3584 bfd_boolean just_syms;
3586 htab = elf_hash_table (info);
3587 bed = get_elf_backend_data (abfd);
3589 if ((abfd->flags & DYNAMIC) == 0)
3595 /* You can't use -r against a dynamic object. Also, there's no
3596 hope of using a dynamic object which does not exactly match
3597 the format of the output file. */
3598 if (bfd_link_relocatable (info)
3599 || !is_elf_hash_table (htab)
3600 || info->output_bfd->xvec != abfd->xvec)
3602 if (bfd_link_relocatable (info))
3603 bfd_set_error (bfd_error_invalid_operation);
3605 bfd_set_error (bfd_error_wrong_format);
3610 ehdr = elf_elfheader (abfd);
3611 if (info->warn_alternate_em
3612 && bed->elf_machine_code != ehdr->e_machine
3613 && ((bed->elf_machine_alt1 != 0
3614 && ehdr->e_machine == bed->elf_machine_alt1)
3615 || (bed->elf_machine_alt2 != 0
3616 && ehdr->e_machine == bed->elf_machine_alt2)))
3617 info->callbacks->einfo
3618 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3619 ehdr->e_machine, abfd, bed->elf_machine_code);
3621 /* As a GNU extension, any input sections which are named
3622 .gnu.warning.SYMBOL are treated as warning symbols for the given
3623 symbol. This differs from .gnu.warning sections, which generate
3624 warnings when they are included in an output file. */
3625 /* PR 12761: Also generate this warning when building shared libraries. */
3626 for (s = abfd->sections; s != NULL; s = s->next)
3630 name = bfd_get_section_name (abfd, s);
3631 if (CONST_STRNEQ (name, ".gnu.warning."))
3636 name += sizeof ".gnu.warning." - 1;
3638 /* If this is a shared object, then look up the symbol
3639 in the hash table. If it is there, and it is already
3640 been defined, then we will not be using the entry
3641 from this shared object, so we don't need to warn.
3642 FIXME: If we see the definition in a regular object
3643 later on, we will warn, but we shouldn't. The only
3644 fix is to keep track of what warnings we are supposed
3645 to emit, and then handle them all at the end of the
3649 struct elf_link_hash_entry *h;
3651 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3653 /* FIXME: What about bfd_link_hash_common? */
3655 && (h->root.type == bfd_link_hash_defined
3656 || h->root.type == bfd_link_hash_defweak))
3661 msg = (char *) bfd_alloc (abfd, sz + 1);
3665 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3670 if (! (_bfd_generic_link_add_one_symbol
3671 (info, abfd, name, BSF_WARNING, s, 0, msg,
3672 FALSE, bed->collect, NULL)))
3675 if (bfd_link_executable (info))
3677 /* Clobber the section size so that the warning does
3678 not get copied into the output file. */
3681 /* Also set SEC_EXCLUDE, so that symbols defined in
3682 the warning section don't get copied to the output. */
3683 s->flags |= SEC_EXCLUDE;
3688 just_syms = ((s = abfd->sections) != NULL
3689 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);
3694 /* If we are creating a shared library, create all the dynamic
3695 sections immediately. We need to attach them to something,
3696 so we attach them to this BFD, provided it is the right
3697 format and is not from ld --just-symbols. Always create the
3698 dynamic sections for -E/--dynamic-list. FIXME: If there
3699 are no input BFD's of the same format as the output, we can't
3700 make a shared library. */
3702 && (bfd_link_pic (info)
3703 || (!bfd_link_relocatable (info)
3704 && (info->export_dynamic || info->dynamic)))
3705 && is_elf_hash_table (htab)
3706 && info->output_bfd->xvec == abfd->xvec
3707 && !htab->dynamic_sections_created)
3709 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3713 else if (!is_elf_hash_table (htab))
3717 const char *soname = NULL;
3719 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3722 /* ld --just-symbols and dynamic objects don't mix very well.
3723 ld shouldn't allow it. */
3727 /* If this dynamic lib was specified on the command line with
3728 --as-needed in effect, then we don't want to add a DT_NEEDED
3729 tag unless the lib is actually used. Similary for libs brought
3730 in by another lib's DT_NEEDED. When --no-add-needed is used
3731 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3732 any dynamic library in DT_NEEDED tags in the dynamic lib at
3734 add_needed = (elf_dyn_lib_class (abfd)
3735 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3736 | DYN_NO_NEEDED)) == 0;
3738 s = bfd_get_section_by_name (abfd, ".dynamic");
3743 unsigned int elfsec;
3744 unsigned long shlink;
3746 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3753 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3754 if (elfsec == SHN_BAD)
3755 goto error_free_dyn;
3756 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3758 for (extdyn = dynbuf;
3759 extdyn < dynbuf + s->size;
3760 extdyn += bed->s->sizeof_dyn)
3762 Elf_Internal_Dyn dyn;
3764 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3765 if (dyn.d_tag == DT_SONAME)
3767 unsigned int tagv = dyn.d_un.d_val;
3768 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3770 goto error_free_dyn;
3772 if (dyn.d_tag == DT_NEEDED)
3774 struct bfd_link_needed_list *n, **pn;
3776 unsigned int tagv = dyn.d_un.d_val;
3778 amt = sizeof (struct bfd_link_needed_list);
3779 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3780 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3781 if (n == NULL || fnm == NULL)
3782 goto error_free_dyn;
3783 amt = strlen (fnm) + 1;
3784 anm = (char *) bfd_alloc (abfd, amt);
3786 goto error_free_dyn;
3787 memcpy (anm, fnm, amt);
3791 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3795 if (dyn.d_tag == DT_RUNPATH)
3797 struct bfd_link_needed_list *n, **pn;
3799 unsigned int tagv = dyn.d_un.d_val;
3801 amt = sizeof (struct bfd_link_needed_list);
3802 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3803 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3804 if (n == NULL || fnm == NULL)
3805 goto error_free_dyn;
3806 amt = strlen (fnm) + 1;
3807 anm = (char *) bfd_alloc (abfd, amt);
3809 goto error_free_dyn;
3810 memcpy (anm, fnm, amt);
3814 for (pn = & runpath;
3820 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3821 if (!runpath && dyn.d_tag == DT_RPATH)
3823 struct bfd_link_needed_list *n, **pn;
3825 unsigned int tagv = dyn.d_un.d_val;
3827 amt = sizeof (struct bfd_link_needed_list);
3828 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3829 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3830 if (n == NULL || fnm == NULL)
3831 goto error_free_dyn;
3832 amt = strlen (fnm) + 1;
3833 anm = (char *) bfd_alloc (abfd, amt);
3835 goto error_free_dyn;
3836 memcpy (anm, fnm, amt);
3846 if (dyn.d_tag == DT_AUDIT)
3848 unsigned int tagv = dyn.d_un.d_val;
3849 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3856 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3857 frees all more recently bfd_alloc'd blocks as well. */
3863 struct bfd_link_needed_list **pn;
3864 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3869 /* We do not want to include any of the sections in a dynamic
3870 object in the output file. We hack by simply clobbering the
3871 list of sections in the BFD. This could be handled more
3872 cleanly by, say, a new section flag; the existing
3873 SEC_NEVER_LOAD flag is not the one we want, because that one
3874 still implies that the section takes up space in the output
3876 bfd_section_list_clear (abfd);
3878 /* Find the name to use in a DT_NEEDED entry that refers to this
3879 object. If the object has a DT_SONAME entry, we use it.
3880 Otherwise, if the generic linker stuck something in
3881 elf_dt_name, we use that. Otherwise, we just use the file
3883 if (soname == NULL || *soname == '\0')
3885 soname = elf_dt_name (abfd);
3886 if (soname == NULL || *soname == '\0')
3887 soname = bfd_get_filename (abfd);
3890 /* Save the SONAME because sometimes the linker emulation code
3891 will need to know it. */
3892 elf_dt_name (abfd) = soname;
3894 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3898 /* If we have already included this dynamic object in the
3899 link, just ignore it. There is no reason to include a
3900 particular dynamic object more than once. */
3904 /* Save the DT_AUDIT entry for the linker emulation code. */
3905 elf_dt_audit (abfd) = audit;
3908 /* If this is a dynamic object, we always link against the .dynsym
3909 symbol table, not the .symtab symbol table. The dynamic linker
3910 will only see the .dynsym symbol table, so there is no reason to
3911 look at .symtab for a dynamic object. */
3913 if (! dynamic || elf_dynsymtab (abfd) == 0)
3914 hdr = &elf_tdata (abfd)->symtab_hdr;
3916 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3918 symcount = hdr->sh_size / bed->s->sizeof_sym;
3920 /* The sh_info field of the symtab header tells us where the
3921 external symbols start. We don't care about the local symbols at
3923 if (elf_bad_symtab (abfd))
3925 extsymcount = symcount;
3930 extsymcount = symcount - hdr->sh_info;
3931 extsymoff = hdr->sh_info;
3934 sym_hash = elf_sym_hashes (abfd);
3935 if (extsymcount != 0)
3937 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3939 if (isymbuf == NULL)
3942 if (sym_hash == NULL)
3944 /* We store a pointer to the hash table entry for each
3946 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3947 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
3948 if (sym_hash == NULL)
3949 goto error_free_sym;
3950 elf_sym_hashes (abfd) = sym_hash;
3956 /* Read in any version definitions. */
3957 if (!_bfd_elf_slurp_version_tables (abfd,
3958 info->default_imported_symver))
3959 goto error_free_sym;
3961 /* Read in the symbol versions, but don't bother to convert them
3962 to internal format. */
3963 if (elf_dynversym (abfd) != 0)
3965 Elf_Internal_Shdr *versymhdr;
3967 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3968 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3969 if (extversym == NULL)
3970 goto error_free_sym;
3971 amt = versymhdr->sh_size;
3972 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3973 || bfd_bread (extversym, amt, abfd) != amt)
3974 goto error_free_vers;
3978 /* If we are loading an as-needed shared lib, save the symbol table
3979 state before we start adding symbols. If the lib turns out
3980 to be unneeded, restore the state. */
3981 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3986 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3988 struct bfd_hash_entry *p;
3989 struct elf_link_hash_entry *h;
3991 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3993 h = (struct elf_link_hash_entry *) p;
3994 entsize += htab->root.table.entsize;
3995 if (h->root.type == bfd_link_hash_warning)
3996 entsize += htab->root.table.entsize;
4000 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
4001 old_tab = bfd_malloc (tabsize + entsize);
4002 if (old_tab == NULL)
4003 goto error_free_vers;
4005 /* Remember the current objalloc pointer, so that all mem for
4006 symbols added can later be reclaimed. */
4007 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
4008 if (alloc_mark == NULL)
4009 goto error_free_vers;
4011 /* Make a special call to the linker "notice" function to
4012 tell it that we are about to handle an as-needed lib. */
4013 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
4014 goto error_free_vers;
4016 /* Clone the symbol table. Remember some pointers into the
4017 symbol table, and dynamic symbol count. */
4018 old_ent = (char *) old_tab + tabsize;
4019 memcpy (old_tab, htab->root.table.table, tabsize);
4020 old_undefs = htab->root.undefs;
4021 old_undefs_tail = htab->root.undefs_tail;
4022 old_table = htab->root.table.table;
4023 old_size = htab->root.table.size;
4024 old_count = htab->root.table.count;
4025 old_dynsymcount = htab->dynsymcount;
4026 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
4028 for (i = 0; i < htab->root.table.size; i++)
4030 struct bfd_hash_entry *p;
4031 struct elf_link_hash_entry *h;
4033 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4035 memcpy (old_ent, p, htab->root.table.entsize);
4036 old_ent = (char *) old_ent + htab->root.table.entsize;
4037 h = (struct elf_link_hash_entry *) p;
4038 if (h->root.type == bfd_link_hash_warning)
4040 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
4041 old_ent = (char *) old_ent + htab->root.table.entsize;
4048 ever = extversym != NULL ? extversym + extsymoff : NULL;
4049 for (isym = isymbuf, isymend = isymbuf + extsymcount;
4051 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
4055 asection *sec, *new_sec;
4058 struct elf_link_hash_entry *h;
4059 struct elf_link_hash_entry *hi;
4060 bfd_boolean definition;
4061 bfd_boolean size_change_ok;
4062 bfd_boolean type_change_ok;
4063 bfd_boolean new_weakdef;
4064 bfd_boolean new_weak;
4065 bfd_boolean old_weak;
4066 bfd_boolean override;
4068 unsigned int old_alignment;
4070 bfd_boolean matched;
4074 flags = BSF_NO_FLAGS;
4076 value = isym->st_value;
4077 common = bed->common_definition (isym);
4079 bind = ELF_ST_BIND (isym->st_info);
4083 /* This should be impossible, since ELF requires that all
4084 global symbols follow all local symbols, and that sh_info
4085 point to the first global symbol. Unfortunately, Irix 5
4090 if (isym->st_shndx != SHN_UNDEF && !common)
4098 case STB_GNU_UNIQUE:
4099 flags = BSF_GNU_UNIQUE;
4103 /* Leave it up to the processor backend. */
4107 if (isym->st_shndx == SHN_UNDEF)
4108 sec = bfd_und_section_ptr;
4109 else if (isym->st_shndx == SHN_ABS)
4110 sec = bfd_abs_section_ptr;
4111 else if (isym->st_shndx == SHN_COMMON)
4113 sec = bfd_com_section_ptr;
4114 /* What ELF calls the size we call the value. What ELF
4115 calls the value we call the alignment. */
4116 value = isym->st_size;
4120 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
4122 sec = bfd_abs_section_ptr;
4123 else if (discarded_section (sec))
4125 /* Symbols from discarded section are undefined. We keep
4127 sec = bfd_und_section_ptr;
4128 isym->st_shndx = SHN_UNDEF;
4130 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
4134 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
4137 goto error_free_vers;
4139 if (isym->st_shndx == SHN_COMMON
4140 && (abfd->flags & BFD_PLUGIN) != 0)
4142 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
4146 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
4148 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
4150 goto error_free_vers;
4154 else if (isym->st_shndx == SHN_COMMON
4155 && ELF_ST_TYPE (isym->st_info) == STT_TLS
4156 && !bfd_link_relocatable (info))
4158 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
4162 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
4163 | SEC_LINKER_CREATED);
4164 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
4166 goto error_free_vers;
4170 else if (bed->elf_add_symbol_hook)
4172 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
4174 goto error_free_vers;
4176 /* The hook function sets the name to NULL if this symbol
4177 should be skipped for some reason. */
4182 /* Sanity check that all possibilities were handled. */
4185 bfd_set_error (bfd_error_bad_value);
4186 goto error_free_vers;
4189 /* Silently discard TLS symbols from --just-syms. There's
4190 no way to combine a static TLS block with a new TLS block
4191 for this executable. */
4192 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
4193 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
4196 if (bfd_is_und_section (sec)
4197 || bfd_is_com_section (sec))
4202 size_change_ok = FALSE;
4203 type_change_ok = bed->type_change_ok;
4210 if (is_elf_hash_table (htab))
4212 Elf_Internal_Versym iver;
4213 unsigned int vernum = 0;
4218 if (info->default_imported_symver)
4219 /* Use the default symbol version created earlier. */
4220 iver.vs_vers = elf_tdata (abfd)->cverdefs;
4225 _bfd_elf_swap_versym_in (abfd, ever, &iver);
4227 vernum = iver.vs_vers & VERSYM_VERSION;
4229 /* If this is a hidden symbol, or if it is not version
4230 1, we append the version name to the symbol name.
4231 However, we do not modify a non-hidden absolute symbol
4232 if it is not a function, because it might be the version
4233 symbol itself. FIXME: What if it isn't? */
4234 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4236 && (!bfd_is_abs_section (sec)
4237 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4240 size_t namelen, verlen, newlen;
4243 if (isym->st_shndx != SHN_UNDEF)
4245 if (vernum > elf_tdata (abfd)->cverdefs)
4247 else if (vernum > 1)
4249 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4255 (*_bfd_error_handler)
4256 (_("%B: %s: invalid version %u (max %d)"),
4258 elf_tdata (abfd)->cverdefs);
4259 bfd_set_error (bfd_error_bad_value);
4260 goto error_free_vers;
4265 /* We cannot simply test for the number of
4266 entries in the VERNEED section since the
4267 numbers for the needed versions do not start
4269 Elf_Internal_Verneed *t;
4272 for (t = elf_tdata (abfd)->verref;
4276 Elf_Internal_Vernaux *a;
4278 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4280 if (a->vna_other == vernum)
4282 verstr = a->vna_nodename;
4291 (*_bfd_error_handler)
4292 (_("%B: %s: invalid needed version %d"),
4293 abfd, name, vernum);
4294 bfd_set_error (bfd_error_bad_value);
4295 goto error_free_vers;
4299 namelen = strlen (name);
4300 verlen = strlen (verstr);
4301 newlen = namelen + verlen + 2;
4302 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4303 && isym->st_shndx != SHN_UNDEF)
4306 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4307 if (newname == NULL)
4308 goto error_free_vers;
4309 memcpy (newname, name, namelen);
4310 p = newname + namelen;
4312 /* If this is a defined non-hidden version symbol,
4313 we add another @ to the name. This indicates the
4314 default version of the symbol. */
4315 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4316 && isym->st_shndx != SHN_UNDEF)
4318 memcpy (p, verstr, verlen + 1);
4323 /* If this symbol has default visibility and the user has
4324 requested we not re-export it, then mark it as hidden. */
4325 if (!bfd_is_und_section (sec)
4328 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4329 isym->st_other = (STV_HIDDEN
4330 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4332 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4333 sym_hash, &old_bfd, &old_weak,
4334 &old_alignment, &skip, &override,
4335 &type_change_ok, &size_change_ok,
4337 goto error_free_vers;
4342 /* Override a definition only if the new symbol matches the
4344 if (override && matched)
4348 while (h->root.type == bfd_link_hash_indirect
4349 || h->root.type == bfd_link_hash_warning)
4350 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4352 if (elf_tdata (abfd)->verdef != NULL
4355 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4358 if (! (_bfd_generic_link_add_one_symbol
4359 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4360 (struct bfd_link_hash_entry **) sym_hash)))
4361 goto error_free_vers;
4364 /* We need to make sure that indirect symbol dynamic flags are
4367 while (h->root.type == bfd_link_hash_indirect
4368 || h->root.type == bfd_link_hash_warning)
4369 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4373 new_weak = (flags & BSF_WEAK) != 0;
4374 new_weakdef = FALSE;
4378 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4379 && is_elf_hash_table (htab)
4380 && h->u.weakdef == NULL)
4382 /* Keep a list of all weak defined non function symbols from
4383 a dynamic object, using the weakdef field. Later in this
4384 function we will set the weakdef field to the correct
4385 value. We only put non-function symbols from dynamic
4386 objects on this list, because that happens to be the only
4387 time we need to know the normal symbol corresponding to a
4388 weak symbol, and the information is time consuming to
4389 figure out. If the weakdef field is not already NULL,
4390 then this symbol was already defined by some previous
4391 dynamic object, and we will be using that previous
4392 definition anyhow. */
4394 h->u.weakdef = weaks;
4399 /* Set the alignment of a common symbol. */
4400 if ((common || bfd_is_com_section (sec))
4401 && h->root.type == bfd_link_hash_common)
4406 align = bfd_log2 (isym->st_value);
4409 /* The new symbol is a common symbol in a shared object.
4410 We need to get the alignment from the section. */
4411 align = new_sec->alignment_power;
4413 if (align > old_alignment)
4414 h->root.u.c.p->alignment_power = align;
4416 h->root.u.c.p->alignment_power = old_alignment;
4419 if (is_elf_hash_table (htab))
4421 /* Set a flag in the hash table entry indicating the type of
4422 reference or definition we just found. A dynamic symbol
4423 is one which is referenced or defined by both a regular
4424 object and a shared object. */
4425 bfd_boolean dynsym = FALSE;
4427 /* Plugin symbols aren't normal. Don't set def_regular or
4428 ref_regular for them, or make them dynamic. */
4429 if ((abfd->flags & BFD_PLUGIN) != 0)
4436 if (bind != STB_WEAK)
4437 h->ref_regular_nonweak = 1;
4449 /* If the indirect symbol has been forced local, don't
4450 make the real symbol dynamic. */
4451 if ((h == hi || !hi->forced_local)
4452 && (bfd_link_dll (info)
4462 hi->ref_dynamic = 1;
4467 hi->def_dynamic = 1;
4470 /* If the indirect symbol has been forced local, don't
4471 make the real symbol dynamic. */
4472 if ((h == hi || !hi->forced_local)
4475 || (h->u.weakdef != NULL
4477 && h->u.weakdef->dynindx != -1)))
4481 /* Check to see if we need to add an indirect symbol for
4482 the default name. */
4484 || (!override && h->root.type == bfd_link_hash_common))
4485 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4486 sec, value, &old_bfd, &dynsym))
4487 goto error_free_vers;
4489 /* Check the alignment when a common symbol is involved. This
4490 can change when a common symbol is overridden by a normal
4491 definition or a common symbol is ignored due to the old
4492 normal definition. We need to make sure the maximum
4493 alignment is maintained. */
4494 if ((old_alignment || common)
4495 && h->root.type != bfd_link_hash_common)
4497 unsigned int common_align;
4498 unsigned int normal_align;
4499 unsigned int symbol_align;
4503 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4504 || h->root.type == bfd_link_hash_defweak);
4506 symbol_align = ffs (h->root.u.def.value) - 1;
4507 if (h->root.u.def.section->owner != NULL
4508 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4510 normal_align = h->root.u.def.section->alignment_power;
4511 if (normal_align > symbol_align)
4512 normal_align = symbol_align;
4515 normal_align = symbol_align;
4519 common_align = old_alignment;
4520 common_bfd = old_bfd;
4525 common_align = bfd_log2 (isym->st_value);
4527 normal_bfd = old_bfd;
4530 if (normal_align < common_align)
4532 /* PR binutils/2735 */
4533 if (normal_bfd == NULL)
4534 (*_bfd_error_handler)
4535 (_("Warning: alignment %u of common symbol `%s' in %B is"
4536 " greater than the alignment (%u) of its section %A"),
4537 common_bfd, h->root.u.def.section,
4538 1 << common_align, name, 1 << normal_align);
4540 (*_bfd_error_handler)
4541 (_("Warning: alignment %u of symbol `%s' in %B"
4542 " is smaller than %u in %B"),
4543 normal_bfd, common_bfd,
4544 1 << normal_align, name, 1 << common_align);
4548 /* Remember the symbol size if it isn't undefined. */
4549 if (isym->st_size != 0
4550 && isym->st_shndx != SHN_UNDEF
4551 && (definition || h->size == 0))
4554 && h->size != isym->st_size
4555 && ! size_change_ok)
4556 (*_bfd_error_handler)
4557 (_("Warning: size of symbol `%s' changed"
4558 " from %lu in %B to %lu in %B"),
4560 name, (unsigned long) h->size,
4561 (unsigned long) isym->st_size);
4563 h->size = isym->st_size;
4566 /* If this is a common symbol, then we always want H->SIZE
4567 to be the size of the common symbol. The code just above
4568 won't fix the size if a common symbol becomes larger. We
4569 don't warn about a size change here, because that is
4570 covered by --warn-common. Allow changes between different
4572 if (h->root.type == bfd_link_hash_common)
4573 h->size = h->root.u.c.size;
4575 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4576 && ((definition && !new_weak)
4577 || (old_weak && h->root.type == bfd_link_hash_common)
4578 || h->type == STT_NOTYPE))
4580 unsigned int type = ELF_ST_TYPE (isym->st_info);
4582 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4584 if (type == STT_GNU_IFUNC
4585 && (abfd->flags & DYNAMIC) != 0)
4588 if (h->type != type)
4590 if (h->type != STT_NOTYPE && ! type_change_ok)
4591 (*_bfd_error_handler)
4592 (_("Warning: type of symbol `%s' changed"
4593 " from %d to %d in %B"),
4594 abfd, name, h->type, type);
4600 /* Merge st_other field. */
4601 elf_merge_st_other (abfd, h, isym, sec, definition, dynamic);
4603 /* We don't want to make debug symbol dynamic. */
4605 && (sec->flags & SEC_DEBUGGING)
4606 && !bfd_link_relocatable (info))
4609 /* Nor should we make plugin symbols dynamic. */
4610 if ((abfd->flags & BFD_PLUGIN) != 0)
4615 h->target_internal = isym->st_target_internal;
4616 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4619 if (definition && !dynamic)
4621 char *p = strchr (name, ELF_VER_CHR);
4622 if (p != NULL && p[1] != ELF_VER_CHR)
4624 /* Queue non-default versions so that .symver x, x@FOO
4625 aliases can be checked. */
4628 amt = ((isymend - isym + 1)
4629 * sizeof (struct elf_link_hash_entry *));
4631 = (struct elf_link_hash_entry **) bfd_malloc (amt);
4633 goto error_free_vers;
4635 nondeflt_vers[nondeflt_vers_cnt++] = h;
4639 if (dynsym && h->dynindx == -1)
4641 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4642 goto error_free_vers;
4643 if (h->u.weakdef != NULL
4645 && h->u.weakdef->dynindx == -1)
4647 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4648 goto error_free_vers;
4651 else if (h->dynindx != -1)
4652 /* If the symbol already has a dynamic index, but
4653 visibility says it should not be visible, turn it into
4655 switch (ELF_ST_VISIBILITY (h->other))
4659 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4664 /* Don't add DT_NEEDED for references from the dummy bfd nor
4665 for unmatched symbol. */
4670 && h->ref_regular_nonweak
4672 || (old_bfd->flags & BFD_PLUGIN) == 0))
4673 || (h->ref_dynamic_nonweak
4674 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4675 && !on_needed_list (elf_dt_name (abfd),
4676 htab->needed, NULL))))
4679 const char *soname = elf_dt_name (abfd);
4681 info->callbacks->minfo ("%!", soname, old_bfd,
4682 h->root.root.string);
4684 /* A symbol from a library loaded via DT_NEEDED of some
4685 other library is referenced by a regular object.
4686 Add a DT_NEEDED entry for it. Issue an error if
4687 --no-add-needed is used and the reference was not
4690 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4692 (*_bfd_error_handler)
4693 (_("%B: undefined reference to symbol '%s'"),
4695 bfd_set_error (bfd_error_missing_dso);
4696 goto error_free_vers;
4699 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4700 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4703 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4705 goto error_free_vers;
4707 BFD_ASSERT (ret == 0);
4712 if (extversym != NULL)
4718 if (isymbuf != NULL)
4724 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4728 /* Restore the symbol table. */
4729 old_ent = (char *) old_tab + tabsize;
4730 memset (elf_sym_hashes (abfd), 0,
4731 extsymcount * sizeof (struct elf_link_hash_entry *));
4732 htab->root.table.table = old_table;
4733 htab->root.table.size = old_size;
4734 htab->root.table.count = old_count;
4735 memcpy (htab->root.table.table, old_tab, tabsize);
4736 htab->root.undefs = old_undefs;
4737 htab->root.undefs_tail = old_undefs_tail;
4738 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4739 for (i = 0; i < htab->root.table.size; i++)
4741 struct bfd_hash_entry *p;
4742 struct elf_link_hash_entry *h;
4744 unsigned int alignment_power;
4746 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4748 h = (struct elf_link_hash_entry *) p;
4749 if (h->root.type == bfd_link_hash_warning)
4750 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4751 if (h->dynindx >= old_dynsymcount
4752 && h->dynstr_index < old_dynstr_size)
4753 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4755 /* Preserve the maximum alignment and size for common
4756 symbols even if this dynamic lib isn't on DT_NEEDED
4757 since it can still be loaded at run time by another
4759 if (h->root.type == bfd_link_hash_common)
4761 size = h->root.u.c.size;
4762 alignment_power = h->root.u.c.p->alignment_power;
4767 alignment_power = 0;
4769 memcpy (p, old_ent, htab->root.table.entsize);
4770 old_ent = (char *) old_ent + htab->root.table.entsize;
4771 h = (struct elf_link_hash_entry *) p;
4772 if (h->root.type == bfd_link_hash_warning)
4774 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4775 old_ent = (char *) old_ent + htab->root.table.entsize;
4776 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4778 if (h->root.type == bfd_link_hash_common)
4780 if (size > h->root.u.c.size)
4781 h->root.u.c.size = size;
4782 if (alignment_power > h->root.u.c.p->alignment_power)
4783 h->root.u.c.p->alignment_power = alignment_power;
4788 /* Make a special call to the linker "notice" function to
4789 tell it that symbols added for crefs may need to be removed. */
4790 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4791 goto error_free_vers;
4794 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4796 if (nondeflt_vers != NULL)
4797 free (nondeflt_vers);
4801 if (old_tab != NULL)
4803 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4804 goto error_free_vers;
4809 /* Now that all the symbols from this input file are created, if
4810 not performing a relocatable link, handle .symver foo, foo@BAR
4811 such that any relocs against foo become foo@BAR. */
4812 if (!bfd_link_relocatable (info) && nondeflt_vers != NULL)
4814 bfd_size_type cnt, symidx;
4816 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4818 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4819 char *shortname, *p;
4821 p = strchr (h->root.root.string, ELF_VER_CHR);
4823 || (h->root.type != bfd_link_hash_defined
4824 && h->root.type != bfd_link_hash_defweak))
4827 amt = p - h->root.root.string;
4828 shortname = (char *) bfd_malloc (amt + 1);
4830 goto error_free_vers;
4831 memcpy (shortname, h->root.root.string, amt);
4832 shortname[amt] = '\0';
4834 hi = (struct elf_link_hash_entry *)
4835 bfd_link_hash_lookup (&htab->root, shortname,
4836 FALSE, FALSE, FALSE);
4838 && hi->root.type == h->root.type
4839 && hi->root.u.def.value == h->root.u.def.value
4840 && hi->root.u.def.section == h->root.u.def.section)
4842 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4843 hi->root.type = bfd_link_hash_indirect;
4844 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4845 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4846 sym_hash = elf_sym_hashes (abfd);
4848 for (symidx = 0; symidx < extsymcount; ++symidx)
4849 if (sym_hash[symidx] == hi)
4851 sym_hash[symidx] = h;
4857 free (nondeflt_vers);
4858 nondeflt_vers = NULL;
4861 /* Now set the weakdefs field correctly for all the weak defined
4862 symbols we found. The only way to do this is to search all the
4863 symbols. Since we only need the information for non functions in
4864 dynamic objects, that's the only time we actually put anything on
4865 the list WEAKS. We need this information so that if a regular
4866 object refers to a symbol defined weakly in a dynamic object, the
4867 real symbol in the dynamic object is also put in the dynamic
4868 symbols; we also must arrange for both symbols to point to the
4869 same memory location. We could handle the general case of symbol
4870 aliasing, but a general symbol alias can only be generated in
4871 assembler code, handling it correctly would be very time
4872 consuming, and other ELF linkers don't handle general aliasing
4876 struct elf_link_hash_entry **hpp;
4877 struct elf_link_hash_entry **hppend;
4878 struct elf_link_hash_entry **sorted_sym_hash;
4879 struct elf_link_hash_entry *h;
4882 /* Since we have to search the whole symbol list for each weak
4883 defined symbol, search time for N weak defined symbols will be
4884 O(N^2). Binary search will cut it down to O(NlogN). */
4885 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4886 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4887 if (sorted_sym_hash == NULL)
4889 sym_hash = sorted_sym_hash;
4890 hpp = elf_sym_hashes (abfd);
4891 hppend = hpp + extsymcount;
4893 for (; hpp < hppend; hpp++)
4897 && h->root.type == bfd_link_hash_defined
4898 && !bed->is_function_type (h->type))
4906 qsort (sorted_sym_hash, sym_count,
4907 sizeof (struct elf_link_hash_entry *),
4910 while (weaks != NULL)
4912 struct elf_link_hash_entry *hlook;
4915 size_t i, j, idx = 0;
4918 weaks = hlook->u.weakdef;
4919 hlook->u.weakdef = NULL;
4921 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4922 || hlook->root.type == bfd_link_hash_defweak
4923 || hlook->root.type == bfd_link_hash_common
4924 || hlook->root.type == bfd_link_hash_indirect);
4925 slook = hlook->root.u.def.section;
4926 vlook = hlook->root.u.def.value;
4932 bfd_signed_vma vdiff;
4934 h = sorted_sym_hash[idx];
4935 vdiff = vlook - h->root.u.def.value;
4942 int sdiff = slook->id - h->root.u.def.section->id;
4952 /* We didn't find a value/section match. */
4956 /* With multiple aliases, or when the weak symbol is already
4957 strongly defined, we have multiple matching symbols and
4958 the binary search above may land on any of them. Step
4959 one past the matching symbol(s). */
4962 h = sorted_sym_hash[idx];
4963 if (h->root.u.def.section != slook
4964 || h->root.u.def.value != vlook)
4968 /* Now look back over the aliases. Since we sorted by size
4969 as well as value and section, we'll choose the one with
4970 the largest size. */
4973 h = sorted_sym_hash[idx];
4975 /* Stop if value or section doesn't match. */
4976 if (h->root.u.def.section != slook
4977 || h->root.u.def.value != vlook)
4979 else if (h != hlook)
4981 hlook->u.weakdef = h;
4983 /* If the weak definition is in the list of dynamic
4984 symbols, make sure the real definition is put
4986 if (hlook->dynindx != -1 && h->dynindx == -1)
4988 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4991 free (sorted_sym_hash);
4996 /* If the real definition is in the list of dynamic
4997 symbols, make sure the weak definition is put
4998 there as well. If we don't do this, then the
4999 dynamic loader might not merge the entries for the
5000 real definition and the weak definition. */
5001 if (h->dynindx != -1 && hlook->dynindx == -1)
5003 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
5004 goto err_free_sym_hash;
5011 free (sorted_sym_hash);
5014 if (bed->check_directives
5015 && !(*bed->check_directives) (abfd, info))
5018 if (!info->check_relocs_after_open_input
5019 && !_bfd_elf_link_check_relocs (abfd, info))
5022 /* If this is a non-traditional link, try to optimize the handling
5023 of the .stab/.stabstr sections. */
5025 && ! info->traditional_format
5026 && is_elf_hash_table (htab)
5027 && (info->strip != strip_all && info->strip != strip_debugger))
5031 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
5032 if (stabstr != NULL)
5034 bfd_size_type string_offset = 0;
5037 for (stab = abfd->sections; stab; stab = stab->next)
5038 if (CONST_STRNEQ (stab->name, ".stab")
5039 && (!stab->name[5] ||
5040 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
5041 && (stab->flags & SEC_MERGE) == 0
5042 && !bfd_is_abs_section (stab->output_section))
5044 struct bfd_elf_section_data *secdata;
5046 secdata = elf_section_data (stab);
5047 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
5048 stabstr, &secdata->sec_info,
5051 if (secdata->sec_info)
5052 stab->sec_info_type = SEC_INFO_TYPE_STABS;
5057 if (is_elf_hash_table (htab) && add_needed)
5059 /* Add this bfd to the loaded list. */
5060 struct elf_link_loaded_list *n;
5062 n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n));
5066 n->next = htab->loaded;
5073 if (old_tab != NULL)
5075 if (nondeflt_vers != NULL)
5076 free (nondeflt_vers);
5077 if (extversym != NULL)
5080 if (isymbuf != NULL)
5086 /* Return the linker hash table entry of a symbol that might be
5087 satisfied by an archive symbol. Return -1 on error. */
5089 struct elf_link_hash_entry *
5090 _bfd_elf_archive_symbol_lookup (bfd *abfd,
5091 struct bfd_link_info *info,
5094 struct elf_link_hash_entry *h;
5098 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
5102 /* If this is a default version (the name contains @@), look up the
5103 symbol again with only one `@' as well as without the version.
5104 The effect is that references to the symbol with and without the
5105 version will be matched by the default symbol in the archive. */
5107 p = strchr (name, ELF_VER_CHR);
5108 if (p == NULL || p[1] != ELF_VER_CHR)
5111 /* First check with only one `@'. */
5112 len = strlen (name);
5113 copy = (char *) bfd_alloc (abfd, len);
5115 return (struct elf_link_hash_entry *) 0 - 1;
5117 first = p - name + 1;
5118 memcpy (copy, name, first);
5119 memcpy (copy + first, name + first + 1, len - first);
5121 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
5124 /* We also need to check references to the symbol without the
5126 copy[first - 1] = '\0';
5127 h = elf_link_hash_lookup (elf_hash_table (info), copy,
5128 FALSE, FALSE, TRUE);
5131 bfd_release (abfd, copy);
5135 /* Add symbols from an ELF archive file to the linker hash table. We
5136 don't use _bfd_generic_link_add_archive_symbols because we need to
5137 handle versioned symbols.
5139 Fortunately, ELF archive handling is simpler than that done by
5140 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5141 oddities. In ELF, if we find a symbol in the archive map, and the
5142 symbol is currently undefined, we know that we must pull in that
5145 Unfortunately, we do have to make multiple passes over the symbol
5146 table until nothing further is resolved. */
5149 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
5152 unsigned char *included = NULL;
5156 const struct elf_backend_data *bed;
5157 struct elf_link_hash_entry * (*archive_symbol_lookup)
5158 (bfd *, struct bfd_link_info *, const char *);
5160 if (! bfd_has_map (abfd))
5162 /* An empty archive is a special case. */
5163 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
5165 bfd_set_error (bfd_error_no_armap);
5169 /* Keep track of all symbols we know to be already defined, and all
5170 files we know to be already included. This is to speed up the
5171 second and subsequent passes. */
5172 c = bfd_ardata (abfd)->symdef_count;
5176 amt *= sizeof (*included);
5177 included = (unsigned char *) bfd_zmalloc (amt);
5178 if (included == NULL)
5181 symdefs = bfd_ardata (abfd)->symdefs;
5182 bed = get_elf_backend_data (abfd);
5183 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5196 symdefend = symdef + c;
5197 for (i = 0; symdef < symdefend; symdef++, i++)
5199 struct elf_link_hash_entry *h;
5201 struct bfd_link_hash_entry *undefs_tail;
5206 if (symdef->file_offset == last)
5212 h = archive_symbol_lookup (abfd, info, symdef->name);
5213 if (h == (struct elf_link_hash_entry *) 0 - 1)
5219 if (h->root.type == bfd_link_hash_common)
5221 /* We currently have a common symbol. The archive map contains
5222 a reference to this symbol, so we may want to include it. We
5223 only want to include it however, if this archive element
5224 contains a definition of the symbol, not just another common
5227 Unfortunately some archivers (including GNU ar) will put
5228 declarations of common symbols into their archive maps, as
5229 well as real definitions, so we cannot just go by the archive
5230 map alone. Instead we must read in the element's symbol
5231 table and check that to see what kind of symbol definition
5233 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5236 else if (h->root.type != bfd_link_hash_undefined)
5238 if (h->root.type != bfd_link_hash_undefweak)
5239 /* Symbol must be defined. Don't check it again. */
5244 /* We need to include this archive member. */
5245 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5246 if (element == NULL)
5249 if (! bfd_check_format (element, bfd_object))
5252 undefs_tail = info->hash->undefs_tail;
5254 if (!(*info->callbacks
5255 ->add_archive_element) (info, element, symdef->name, &element))
5257 if (!bfd_link_add_symbols (element, info))
5260 /* If there are any new undefined symbols, we need to make
5261 another pass through the archive in order to see whether
5262 they can be defined. FIXME: This isn't perfect, because
5263 common symbols wind up on undefs_tail and because an
5264 undefined symbol which is defined later on in this pass
5265 does not require another pass. This isn't a bug, but it
5266 does make the code less efficient than it could be. */
5267 if (undefs_tail != info->hash->undefs_tail)
5270 /* Look backward to mark all symbols from this object file
5271 which we have already seen in this pass. */
5275 included[mark] = TRUE;
5280 while (symdefs[mark].file_offset == symdef->file_offset);
5282 /* We mark subsequent symbols from this object file as we go
5283 on through the loop. */
5284 last = symdef->file_offset;
5294 if (included != NULL)
5299 /* Given an ELF BFD, add symbols to the global hash table as
5303 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5305 switch (bfd_get_format (abfd))
5308 return elf_link_add_object_symbols (abfd, info);
5310 return elf_link_add_archive_symbols (abfd, info);
5312 bfd_set_error (bfd_error_wrong_format);
5317 struct hash_codes_info
5319 unsigned long *hashcodes;
5323 /* This function will be called though elf_link_hash_traverse to store
5324 all hash value of the exported symbols in an array. */
5327 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5329 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5334 /* Ignore indirect symbols. These are added by the versioning code. */
5335 if (h->dynindx == -1)
5338 name = h->root.root.string;
5339 if (h->versioned >= versioned)
5341 char *p = strchr (name, ELF_VER_CHR);
5344 alc = (char *) bfd_malloc (p - name + 1);
5350 memcpy (alc, name, p - name);
5351 alc[p - name] = '\0';
5356 /* Compute the hash value. */
5357 ha = bfd_elf_hash (name);
5359 /* Store the found hash value in the array given as the argument. */
5360 *(inf->hashcodes)++ = ha;
5362 /* And store it in the struct so that we can put it in the hash table
5364 h->u.elf_hash_value = ha;
5372 struct collect_gnu_hash_codes
5375 const struct elf_backend_data *bed;
5376 unsigned long int nsyms;
5377 unsigned long int maskbits;
5378 unsigned long int *hashcodes;
5379 unsigned long int *hashval;
5380 unsigned long int *indx;
5381 unsigned long int *counts;
5384 long int min_dynindx;
5385 unsigned long int bucketcount;
5386 unsigned long int symindx;
5387 long int local_indx;
5388 long int shift1, shift2;
5389 unsigned long int mask;
5393 /* This function will be called though elf_link_hash_traverse to store
5394 all hash value of the exported symbols in an array. */
5397 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5399 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5404 /* Ignore indirect symbols. These are added by the versioning code. */
5405 if (h->dynindx == -1)
5408 /* Ignore also local symbols and undefined symbols. */
5409 if (! (*s->bed->elf_hash_symbol) (h))
5412 name = h->root.root.string;
5413 if (h->versioned >= versioned)
5415 char *p = strchr (name, ELF_VER_CHR);
5418 alc = (char *) bfd_malloc (p - name + 1);
5424 memcpy (alc, name, p - name);
5425 alc[p - name] = '\0';
5430 /* Compute the hash value. */
5431 ha = bfd_elf_gnu_hash (name);
5433 /* Store the found hash value in the array for compute_bucket_count,
5434 and also for .dynsym reordering purposes. */
5435 s->hashcodes[s->nsyms] = ha;
5436 s->hashval[h->dynindx] = ha;
5438 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5439 s->min_dynindx = h->dynindx;
5447 /* This function will be called though elf_link_hash_traverse to do
5448 final dynaminc symbol renumbering. */
5451 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5453 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5454 unsigned long int bucket;
5455 unsigned long int val;
5457 /* Ignore indirect symbols. */
5458 if (h->dynindx == -1)
5461 /* Ignore also local symbols and undefined symbols. */
5462 if (! (*s->bed->elf_hash_symbol) (h))
5464 if (h->dynindx >= s->min_dynindx)
5465 h->dynindx = s->local_indx++;
5469 bucket = s->hashval[h->dynindx] % s->bucketcount;
5470 val = (s->hashval[h->dynindx] >> s->shift1)
5471 & ((s->maskbits >> s->shift1) - 1);
5472 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5474 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5475 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5476 if (s->counts[bucket] == 1)
5477 /* Last element terminates the chain. */
5479 bfd_put_32 (s->output_bfd, val,
5480 s->contents + (s->indx[bucket] - s->symindx) * 4);
5481 --s->counts[bucket];
5482 h->dynindx = s->indx[bucket]++;
5486 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5489 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5491 return !(h->forced_local
5492 || h->root.type == bfd_link_hash_undefined
5493 || h->root.type == bfd_link_hash_undefweak
5494 || ((h->root.type == bfd_link_hash_defined
5495 || h->root.type == bfd_link_hash_defweak)
5496 && h->root.u.def.section->output_section == NULL));
5499 /* Array used to determine the number of hash table buckets to use
5500 based on the number of symbols there are. If there are fewer than
5501 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5502 fewer than 37 we use 17 buckets, and so forth. We never use more
5503 than 32771 buckets. */
5505 static const size_t elf_buckets[] =
5507 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5511 /* Compute bucket count for hashing table. We do not use a static set
5512 of possible tables sizes anymore. Instead we determine for all
5513 possible reasonable sizes of the table the outcome (i.e., the
5514 number of collisions etc) and choose the best solution. The
5515 weighting functions are not too simple to allow the table to grow
5516 without bounds. Instead one of the weighting factors is the size.
5517 Therefore the result is always a good payoff between few collisions
5518 (= short chain lengths) and table size. */
5520 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5521 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5522 unsigned long int nsyms,
5525 size_t best_size = 0;
5526 unsigned long int i;
5528 /* We have a problem here. The following code to optimize the table
5529 size requires an integer type with more the 32 bits. If
5530 BFD_HOST_U_64_BIT is set we know about such a type. */
5531 #ifdef BFD_HOST_U_64_BIT
5536 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5537 bfd *dynobj = elf_hash_table (info)->dynobj;
5538 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5539 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5540 unsigned long int *counts;
5542 unsigned int no_improvement_count = 0;
5544 /* Possible optimization parameters: if we have NSYMS symbols we say
5545 that the hashing table must at least have NSYMS/4 and at most
5547 minsize = nsyms / 4;
5550 best_size = maxsize = nsyms * 2;
5555 if ((best_size & 31) == 0)
5559 /* Create array where we count the collisions in. We must use bfd_malloc
5560 since the size could be large. */
5562 amt *= sizeof (unsigned long int);
5563 counts = (unsigned long int *) bfd_malloc (amt);
5567 /* Compute the "optimal" size for the hash table. The criteria is a
5568 minimal chain length. The minor criteria is (of course) the size
5570 for (i = minsize; i < maxsize; ++i)
5572 /* Walk through the array of hashcodes and count the collisions. */
5573 BFD_HOST_U_64_BIT max;
5574 unsigned long int j;
5575 unsigned long int fact;
5577 if (gnu_hash && (i & 31) == 0)
5580 memset (counts, '\0', i * sizeof (unsigned long int));
5582 /* Determine how often each hash bucket is used. */
5583 for (j = 0; j < nsyms; ++j)
5584 ++counts[hashcodes[j] % i];
5586 /* For the weight function we need some information about the
5587 pagesize on the target. This is information need not be 100%
5588 accurate. Since this information is not available (so far) we
5589 define it here to a reasonable default value. If it is crucial
5590 to have a better value some day simply define this value. */
5591 # ifndef BFD_TARGET_PAGESIZE
5592 # define BFD_TARGET_PAGESIZE (4096)
5595 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5597 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5600 /* Variant 1: optimize for short chains. We add the squares
5601 of all the chain lengths (which favors many small chain
5602 over a few long chains). */
5603 for (j = 0; j < i; ++j)
5604 max += counts[j] * counts[j];
5606 /* This adds penalties for the overall size of the table. */
5607 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5610 /* Variant 2: Optimize a lot more for small table. Here we
5611 also add squares of the size but we also add penalties for
5612 empty slots (the +1 term). */
5613 for (j = 0; j < i; ++j)
5614 max += (1 + counts[j]) * (1 + counts[j]);
5616 /* The overall size of the table is considered, but not as
5617 strong as in variant 1, where it is squared. */
5618 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5622 /* Compare with current best results. */
5623 if (max < best_chlen)
5627 no_improvement_count = 0;
5629 /* PR 11843: Avoid futile long searches for the best bucket size
5630 when there are a large number of symbols. */
5631 else if (++no_improvement_count == 100)
5638 #endif /* defined (BFD_HOST_U_64_BIT) */
5640 /* This is the fallback solution if no 64bit type is available or if we
5641 are not supposed to spend much time on optimizations. We select the
5642 bucket count using a fixed set of numbers. */
5643 for (i = 0; elf_buckets[i] != 0; i++)
5645 best_size = elf_buckets[i];
5646 if (nsyms < elf_buckets[i + 1])
5649 if (gnu_hash && best_size < 2)
5656 /* Size any SHT_GROUP section for ld -r. */
5659 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5663 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5664 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5665 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5670 /* Set a default stack segment size. The value in INFO wins. If it
5671 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5672 undefined it is initialized. */
5675 bfd_elf_stack_segment_size (bfd *output_bfd,
5676 struct bfd_link_info *info,
5677 const char *legacy_symbol,
5678 bfd_vma default_size)
5680 struct elf_link_hash_entry *h = NULL;
5682 /* Look for legacy symbol. */
5684 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5685 FALSE, FALSE, FALSE);
5686 if (h && (h->root.type == bfd_link_hash_defined
5687 || h->root.type == bfd_link_hash_defweak)
5689 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5691 /* The symbol has no type if specified on the command line. */
5692 h->type = STT_OBJECT;
5693 if (info->stacksize)
5694 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5695 output_bfd, legacy_symbol);
5696 else if (h->root.u.def.section != bfd_abs_section_ptr)
5697 (*_bfd_error_handler) (_("%B: %s not absolute"),
5698 output_bfd, legacy_symbol);
5700 info->stacksize = h->root.u.def.value;
5703 if (!info->stacksize)
5704 /* If the user didn't set a size, or explicitly inhibit the
5705 size, set it now. */
5706 info->stacksize = default_size;
5708 /* Provide the legacy symbol, if it is referenced. */
5709 if (h && (h->root.type == bfd_link_hash_undefined
5710 || h->root.type == bfd_link_hash_undefweak))
5712 struct bfd_link_hash_entry *bh = NULL;
5714 if (!(_bfd_generic_link_add_one_symbol
5715 (info, output_bfd, legacy_symbol,
5716 BSF_GLOBAL, bfd_abs_section_ptr,
5717 info->stacksize >= 0 ? info->stacksize : 0,
5718 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5721 h = (struct elf_link_hash_entry *) bh;
5723 h->type = STT_OBJECT;
5729 /* Set up the sizes and contents of the ELF dynamic sections. This is
5730 called by the ELF linker emulation before_allocation routine. We
5731 must set the sizes of the sections before the linker sets the
5732 addresses of the various sections. */
5735 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5738 const char *filter_shlib,
5740 const char *depaudit,
5741 const char * const *auxiliary_filters,
5742 struct bfd_link_info *info,
5743 asection **sinterpptr)
5745 bfd_size_type soname_indx;
5747 const struct elf_backend_data *bed;
5748 struct elf_info_failed asvinfo;
5752 soname_indx = (bfd_size_type) -1;
5754 if (!is_elf_hash_table (info->hash))
5757 bed = get_elf_backend_data (output_bfd);
5759 /* Any syms created from now on start with -1 in
5760 got.refcount/offset and plt.refcount/offset. */
5761 elf_hash_table (info)->init_got_refcount
5762 = elf_hash_table (info)->init_got_offset;
5763 elf_hash_table (info)->init_plt_refcount
5764 = elf_hash_table (info)->init_plt_offset;
5766 if (bfd_link_relocatable (info)
5767 && !_bfd_elf_size_group_sections (info))
5770 /* The backend may have to create some sections regardless of whether
5771 we're dynamic or not. */
5772 if (bed->elf_backend_always_size_sections
5773 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5776 /* Determine any GNU_STACK segment requirements, after the backend
5777 has had a chance to set a default segment size. */
5778 if (info->execstack)
5779 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5780 else if (info->noexecstack)
5781 elf_stack_flags (output_bfd) = PF_R | PF_W;
5785 asection *notesec = NULL;
5788 for (inputobj = info->input_bfds;
5790 inputobj = inputobj->link.next)
5795 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5797 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5800 if (s->flags & SEC_CODE)
5804 else if (bed->default_execstack)
5807 if (notesec || info->stacksize > 0)
5808 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5809 if (notesec && exec && bfd_link_relocatable (info)
5810 && notesec->output_section != bfd_abs_section_ptr)
5811 notesec->output_section->flags |= SEC_CODE;
5814 dynobj = elf_hash_table (info)->dynobj;
5816 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5818 struct elf_info_failed eif;
5819 struct elf_link_hash_entry *h;
5821 struct bfd_elf_version_tree *t;
5822 struct bfd_elf_version_expr *d;
5824 bfd_boolean all_defined;
5826 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5827 BFD_ASSERT (*sinterpptr != NULL || !bfd_link_executable (info) || info->nointerp);
5831 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5833 if (soname_indx == (bfd_size_type) -1
5834 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5840 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5842 info->flags |= DF_SYMBOLIC;
5850 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5852 if (indx == (bfd_size_type) -1)
5855 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5856 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5860 if (filter_shlib != NULL)
5864 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5865 filter_shlib, TRUE);
5866 if (indx == (bfd_size_type) -1
5867 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5871 if (auxiliary_filters != NULL)
5873 const char * const *p;
5875 for (p = auxiliary_filters; *p != NULL; p++)
5879 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5881 if (indx == (bfd_size_type) -1
5882 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5891 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5893 if (indx == (bfd_size_type) -1
5894 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5898 if (depaudit != NULL)
5902 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5904 if (indx == (bfd_size_type) -1
5905 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5912 /* If we are supposed to export all symbols into the dynamic symbol
5913 table (this is not the normal case), then do so. */
5914 if (info->export_dynamic
5915 || (bfd_link_executable (info) && info->dynamic))
5917 elf_link_hash_traverse (elf_hash_table (info),
5918 _bfd_elf_export_symbol,
5924 /* Make all global versions with definition. */
5925 for (t = info->version_info; t != NULL; t = t->next)
5926 for (d = t->globals.list; d != NULL; d = d->next)
5927 if (!d->symver && d->literal)
5929 const char *verstr, *name;
5930 size_t namelen, verlen, newlen;
5931 char *newname, *p, leading_char;
5932 struct elf_link_hash_entry *newh;
5934 leading_char = bfd_get_symbol_leading_char (output_bfd);
5936 namelen = strlen (name) + (leading_char != '\0');
5938 verlen = strlen (verstr);
5939 newlen = namelen + verlen + 3;
5941 newname = (char *) bfd_malloc (newlen);
5942 if (newname == NULL)
5944 newname[0] = leading_char;
5945 memcpy (newname + (leading_char != '\0'), name, namelen);
5947 /* Check the hidden versioned definition. */
5948 p = newname + namelen;
5950 memcpy (p, verstr, verlen + 1);
5951 newh = elf_link_hash_lookup (elf_hash_table (info),
5952 newname, FALSE, FALSE,
5955 || (newh->root.type != bfd_link_hash_defined
5956 && newh->root.type != bfd_link_hash_defweak))
5958 /* Check the default versioned definition. */
5960 memcpy (p, verstr, verlen + 1);
5961 newh = elf_link_hash_lookup (elf_hash_table (info),
5962 newname, FALSE, FALSE,
5967 /* Mark this version if there is a definition and it is
5968 not defined in a shared object. */
5970 && !newh->def_dynamic
5971 && (newh->root.type == bfd_link_hash_defined
5972 || newh->root.type == bfd_link_hash_defweak))
5976 /* Attach all the symbols to their version information. */
5977 asvinfo.info = info;
5978 asvinfo.failed = FALSE;
5980 elf_link_hash_traverse (elf_hash_table (info),
5981 _bfd_elf_link_assign_sym_version,
5986 if (!info->allow_undefined_version)
5988 /* Check if all global versions have a definition. */
5990 for (t = info->version_info; t != NULL; t = t->next)
5991 for (d = t->globals.list; d != NULL; d = d->next)
5992 if (d->literal && !d->symver && !d->script)
5994 (*_bfd_error_handler)
5995 (_("%s: undefined version: %s"),
5996 d->pattern, t->name);
5997 all_defined = FALSE;
6002 bfd_set_error (bfd_error_bad_value);
6007 /* Find all symbols which were defined in a dynamic object and make
6008 the backend pick a reasonable value for them. */
6009 elf_link_hash_traverse (elf_hash_table (info),
6010 _bfd_elf_adjust_dynamic_symbol,
6015 /* Add some entries to the .dynamic section. We fill in some of the
6016 values later, in bfd_elf_final_link, but we must add the entries
6017 now so that we know the final size of the .dynamic section. */
6019 /* If there are initialization and/or finalization functions to
6020 call then add the corresponding DT_INIT/DT_FINI entries. */
6021 h = (info->init_function
6022 ? elf_link_hash_lookup (elf_hash_table (info),
6023 info->init_function, FALSE,
6030 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
6033 h = (info->fini_function
6034 ? elf_link_hash_lookup (elf_hash_table (info),
6035 info->fini_function, FALSE,
6042 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
6046 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
6047 if (s != NULL && s->linker_has_input)
6049 /* DT_PREINIT_ARRAY is not allowed in shared library. */
6050 if (! bfd_link_executable (info))
6055 for (sub = info->input_bfds; sub != NULL;
6056 sub = sub->link.next)
6057 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
6058 for (o = sub->sections; o != NULL; o = o->next)
6059 if (elf_section_data (o)->this_hdr.sh_type
6060 == SHT_PREINIT_ARRAY)
6062 (*_bfd_error_handler)
6063 (_("%B: .preinit_array section is not allowed in DSO"),
6068 bfd_set_error (bfd_error_nonrepresentable_section);
6072 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
6073 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
6076 s = bfd_get_section_by_name (output_bfd, ".init_array");
6077 if (s != NULL && s->linker_has_input)
6079 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
6080 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
6083 s = bfd_get_section_by_name (output_bfd, ".fini_array");
6084 if (s != NULL && s->linker_has_input)
6086 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
6087 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
6091 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
6092 /* If .dynstr is excluded from the link, we don't want any of
6093 these tags. Strictly, we should be checking each section
6094 individually; This quick check covers for the case where
6095 someone does a /DISCARD/ : { *(*) }. */
6096 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
6098 bfd_size_type strsize;
6100 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6101 if ((info->emit_hash
6102 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
6103 || (info->emit_gnu_hash
6104 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
6105 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
6106 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
6107 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
6108 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
6109 bed->s->sizeof_sym))
6114 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
6117 /* The backend must work out the sizes of all the other dynamic
6120 && bed->elf_backend_size_dynamic_sections != NULL
6121 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
6124 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
6126 unsigned long section_sym_count;
6127 struct bfd_elf_version_tree *verdefs;
6130 /* Set up the version definition section. */
6131 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
6132 BFD_ASSERT (s != NULL);
6134 /* We may have created additional version definitions if we are
6135 just linking a regular application. */
6136 verdefs = info->version_info;
6138 /* Skip anonymous version tag. */
6139 if (verdefs != NULL && verdefs->vernum == 0)
6140 verdefs = verdefs->next;
6142 if (verdefs == NULL && !info->create_default_symver)
6143 s->flags |= SEC_EXCLUDE;
6148 struct bfd_elf_version_tree *t;
6150 Elf_Internal_Verdef def;
6151 Elf_Internal_Verdaux defaux;
6152 struct bfd_link_hash_entry *bh;
6153 struct elf_link_hash_entry *h;
6159 /* Make space for the base version. */
6160 size += sizeof (Elf_External_Verdef);
6161 size += sizeof (Elf_External_Verdaux);
6164 /* Make space for the default version. */
6165 if (info->create_default_symver)
6167 size += sizeof (Elf_External_Verdef);
6171 for (t = verdefs; t != NULL; t = t->next)
6173 struct bfd_elf_version_deps *n;
6175 /* Don't emit base version twice. */
6179 size += sizeof (Elf_External_Verdef);
6180 size += sizeof (Elf_External_Verdaux);
6183 for (n = t->deps; n != NULL; n = n->next)
6184 size += sizeof (Elf_External_Verdaux);
6188 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6189 if (s->contents == NULL && s->size != 0)
6192 /* Fill in the version definition section. */
6196 def.vd_version = VER_DEF_CURRENT;
6197 def.vd_flags = VER_FLG_BASE;
6200 if (info->create_default_symver)
6202 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
6203 def.vd_next = sizeof (Elf_External_Verdef);
6207 def.vd_aux = sizeof (Elf_External_Verdef);
6208 def.vd_next = (sizeof (Elf_External_Verdef)
6209 + sizeof (Elf_External_Verdaux));
6212 if (soname_indx != (bfd_size_type) -1)
6214 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6216 def.vd_hash = bfd_elf_hash (soname);
6217 defaux.vda_name = soname_indx;
6224 name = lbasename (output_bfd->filename);
6225 def.vd_hash = bfd_elf_hash (name);
6226 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6228 if (indx == (bfd_size_type) -1)
6230 defaux.vda_name = indx;
6232 defaux.vda_next = 0;
6234 _bfd_elf_swap_verdef_out (output_bfd, &def,
6235 (Elf_External_Verdef *) p);
6236 p += sizeof (Elf_External_Verdef);
6237 if (info->create_default_symver)
6239 /* Add a symbol representing this version. */
6241 if (! (_bfd_generic_link_add_one_symbol
6242 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6244 get_elf_backend_data (dynobj)->collect, &bh)))
6246 h = (struct elf_link_hash_entry *) bh;
6249 h->type = STT_OBJECT;
6250 h->verinfo.vertree = NULL;
6252 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6255 /* Create a duplicate of the base version with the same
6256 aux block, but different flags. */
6259 def.vd_aux = sizeof (Elf_External_Verdef);
6261 def.vd_next = (sizeof (Elf_External_Verdef)
6262 + sizeof (Elf_External_Verdaux));
6265 _bfd_elf_swap_verdef_out (output_bfd, &def,
6266 (Elf_External_Verdef *) p);
6267 p += sizeof (Elf_External_Verdef);
6269 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6270 (Elf_External_Verdaux *) p);
6271 p += sizeof (Elf_External_Verdaux);
6273 for (t = verdefs; t != NULL; t = t->next)
6276 struct bfd_elf_version_deps *n;
6278 /* Don't emit the base version twice. */
6283 for (n = t->deps; n != NULL; n = n->next)
6286 /* Add a symbol representing this version. */
6288 if (! (_bfd_generic_link_add_one_symbol
6289 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6291 get_elf_backend_data (dynobj)->collect, &bh)))
6293 h = (struct elf_link_hash_entry *) bh;
6296 h->type = STT_OBJECT;
6297 h->verinfo.vertree = t;
6299 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6302 def.vd_version = VER_DEF_CURRENT;
6304 if (t->globals.list == NULL
6305 && t->locals.list == NULL
6307 def.vd_flags |= VER_FLG_WEAK;
6308 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6309 def.vd_cnt = cdeps + 1;
6310 def.vd_hash = bfd_elf_hash (t->name);
6311 def.vd_aux = sizeof (Elf_External_Verdef);
6314 /* If a basever node is next, it *must* be the last node in
6315 the chain, otherwise Verdef construction breaks. */
6316 if (t->next != NULL && t->next->vernum == 0)
6317 BFD_ASSERT (t->next->next == NULL);
6319 if (t->next != NULL && t->next->vernum != 0)
6320 def.vd_next = (sizeof (Elf_External_Verdef)
6321 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6323 _bfd_elf_swap_verdef_out (output_bfd, &def,
6324 (Elf_External_Verdef *) p);
6325 p += sizeof (Elf_External_Verdef);
6327 defaux.vda_name = h->dynstr_index;
6328 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6330 defaux.vda_next = 0;
6331 if (t->deps != NULL)
6332 defaux.vda_next = sizeof (Elf_External_Verdaux);
6333 t->name_indx = defaux.vda_name;
6335 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6336 (Elf_External_Verdaux *) p);
6337 p += sizeof (Elf_External_Verdaux);
6339 for (n = t->deps; n != NULL; n = n->next)
6341 if (n->version_needed == NULL)
6343 /* This can happen if there was an error in the
6345 defaux.vda_name = 0;
6349 defaux.vda_name = n->version_needed->name_indx;
6350 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6353 if (n->next == NULL)
6354 defaux.vda_next = 0;
6356 defaux.vda_next = sizeof (Elf_External_Verdaux);
6358 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6359 (Elf_External_Verdaux *) p);
6360 p += sizeof (Elf_External_Verdaux);
6364 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6365 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6368 elf_tdata (output_bfd)->cverdefs = cdefs;
6371 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6373 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6376 else if (info->flags & DF_BIND_NOW)
6378 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6384 if (bfd_link_executable (info))
6385 info->flags_1 &= ~ (DF_1_INITFIRST
6388 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6392 /* Work out the size of the version reference section. */
6394 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6395 BFD_ASSERT (s != NULL);
6397 struct elf_find_verdep_info sinfo;
6400 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6401 if (sinfo.vers == 0)
6403 sinfo.failed = FALSE;
6405 elf_link_hash_traverse (elf_hash_table (info),
6406 _bfd_elf_link_find_version_dependencies,
6411 if (elf_tdata (output_bfd)->verref == NULL)
6412 s->flags |= SEC_EXCLUDE;
6415 Elf_Internal_Verneed *t;
6420 /* Build the version dependency section. */
6423 for (t = elf_tdata (output_bfd)->verref;
6427 Elf_Internal_Vernaux *a;
6429 size += sizeof (Elf_External_Verneed);
6431 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6432 size += sizeof (Elf_External_Vernaux);
6436 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6437 if (s->contents == NULL)
6441 for (t = elf_tdata (output_bfd)->verref;
6446 Elf_Internal_Vernaux *a;
6450 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6453 t->vn_version = VER_NEED_CURRENT;
6455 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6456 elf_dt_name (t->vn_bfd) != NULL
6457 ? elf_dt_name (t->vn_bfd)
6458 : lbasename (t->vn_bfd->filename),
6460 if (indx == (bfd_size_type) -1)
6463 t->vn_aux = sizeof (Elf_External_Verneed);
6464 if (t->vn_nextref == NULL)
6467 t->vn_next = (sizeof (Elf_External_Verneed)
6468 + caux * sizeof (Elf_External_Vernaux));
6470 _bfd_elf_swap_verneed_out (output_bfd, t,
6471 (Elf_External_Verneed *) p);
6472 p += sizeof (Elf_External_Verneed);
6474 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6476 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6477 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6478 a->vna_nodename, FALSE);
6479 if (indx == (bfd_size_type) -1)
6482 if (a->vna_nextptr == NULL)
6485 a->vna_next = sizeof (Elf_External_Vernaux);
6487 _bfd_elf_swap_vernaux_out (output_bfd, a,
6488 (Elf_External_Vernaux *) p);
6489 p += sizeof (Elf_External_Vernaux);
6493 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6494 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6497 elf_tdata (output_bfd)->cverrefs = crefs;
6501 if ((elf_tdata (output_bfd)->cverrefs == 0
6502 && elf_tdata (output_bfd)->cverdefs == 0)
6503 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6504 §ion_sym_count) == 0)
6506 s = bfd_get_linker_section (dynobj, ".gnu.version");
6507 s->flags |= SEC_EXCLUDE;
6513 /* Find the first non-excluded output section. We'll use its
6514 section symbol for some emitted relocs. */
6516 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6520 for (s = output_bfd->sections; s != NULL; s = s->next)
6521 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6522 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6524 elf_hash_table (info)->text_index_section = s;
6529 /* Find two non-excluded output sections, one for code, one for data.
6530 We'll use their section symbols for some emitted relocs. */
6532 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6536 /* Data first, since setting text_index_section changes
6537 _bfd_elf_link_omit_section_dynsym. */
6538 for (s = output_bfd->sections; s != NULL; s = s->next)
6539 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6540 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6542 elf_hash_table (info)->data_index_section = s;
6546 for (s = output_bfd->sections; s != NULL; s = s->next)
6547 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6548 == (SEC_ALLOC | SEC_READONLY))
6549 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6551 elf_hash_table (info)->text_index_section = s;
6555 if (elf_hash_table (info)->text_index_section == NULL)
6556 elf_hash_table (info)->text_index_section
6557 = elf_hash_table (info)->data_index_section;
6561 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6563 const struct elf_backend_data *bed;
6565 if (!is_elf_hash_table (info->hash))
6568 bed = get_elf_backend_data (output_bfd);
6569 (*bed->elf_backend_init_index_section) (output_bfd, info);
6571 if (elf_hash_table (info)->dynamic_sections_created)
6575 bfd_size_type dynsymcount;
6576 unsigned long section_sym_count;
6577 unsigned int dtagcount;
6579 dynobj = elf_hash_table (info)->dynobj;
6581 /* Assign dynsym indicies. In a shared library we generate a
6582 section symbol for each output section, which come first.
6583 Next come all of the back-end allocated local dynamic syms,
6584 followed by the rest of the global symbols. */
6586 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6587 §ion_sym_count);
6589 /* Work out the size of the symbol version section. */
6590 s = bfd_get_linker_section (dynobj, ".gnu.version");
6591 BFD_ASSERT (s != NULL);
6592 if (dynsymcount != 0
6593 && (s->flags & SEC_EXCLUDE) == 0)
6595 s->size = dynsymcount * sizeof (Elf_External_Versym);
6596 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6597 if (s->contents == NULL)
6600 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6604 /* Set the size of the .dynsym and .hash sections. We counted
6605 the number of dynamic symbols in elf_link_add_object_symbols.
6606 We will build the contents of .dynsym and .hash when we build
6607 the final symbol table, because until then we do not know the
6608 correct value to give the symbols. We built the .dynstr
6609 section as we went along in elf_link_add_object_symbols. */
6610 s = elf_hash_table (info)->dynsym;
6611 BFD_ASSERT (s != NULL);
6612 s->size = dynsymcount * bed->s->sizeof_sym;
6614 if (dynsymcount != 0)
6616 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6617 if (s->contents == NULL)
6620 /* The first entry in .dynsym is a dummy symbol.
6621 Clear all the section syms, in case we don't output them all. */
6622 ++section_sym_count;
6623 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6626 elf_hash_table (info)->bucketcount = 0;
6628 /* Compute the size of the hashing table. As a side effect this
6629 computes the hash values for all the names we export. */
6630 if (info->emit_hash)
6632 unsigned long int *hashcodes;
6633 struct hash_codes_info hashinf;
6635 unsigned long int nsyms;
6637 size_t hash_entry_size;
6639 /* Compute the hash values for all exported symbols. At the same
6640 time store the values in an array so that we could use them for
6642 amt = dynsymcount * sizeof (unsigned long int);
6643 hashcodes = (unsigned long int *) bfd_malloc (amt);
6644 if (hashcodes == NULL)
6646 hashinf.hashcodes = hashcodes;
6647 hashinf.error = FALSE;
6649 /* Put all hash values in HASHCODES. */
6650 elf_link_hash_traverse (elf_hash_table (info),
6651 elf_collect_hash_codes, &hashinf);
6658 nsyms = hashinf.hashcodes - hashcodes;
6660 = compute_bucket_count (info, hashcodes, nsyms, 0);
6663 if (bucketcount == 0)
6666 elf_hash_table (info)->bucketcount = bucketcount;
6668 s = bfd_get_linker_section (dynobj, ".hash");
6669 BFD_ASSERT (s != NULL);
6670 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6671 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6672 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6673 if (s->contents == NULL)
6676 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6677 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6678 s->contents + hash_entry_size);
6681 if (info->emit_gnu_hash)
6684 unsigned char *contents;
6685 struct collect_gnu_hash_codes cinfo;
6689 memset (&cinfo, 0, sizeof (cinfo));
6691 /* Compute the hash values for all exported symbols. At the same
6692 time store the values in an array so that we could use them for
6694 amt = dynsymcount * 2 * sizeof (unsigned long int);
6695 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6696 if (cinfo.hashcodes == NULL)
6699 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6700 cinfo.min_dynindx = -1;
6701 cinfo.output_bfd = output_bfd;
6704 /* Put all hash values in HASHCODES. */
6705 elf_link_hash_traverse (elf_hash_table (info),
6706 elf_collect_gnu_hash_codes, &cinfo);
6709 free (cinfo.hashcodes);
6714 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6716 if (bucketcount == 0)
6718 free (cinfo.hashcodes);
6722 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6723 BFD_ASSERT (s != NULL);
6725 if (cinfo.nsyms == 0)
6727 /* Empty .gnu.hash section is special. */
6728 BFD_ASSERT (cinfo.min_dynindx == -1);
6729 free (cinfo.hashcodes);
6730 s->size = 5 * 4 + bed->s->arch_size / 8;
6731 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6732 if (contents == NULL)
6734 s->contents = contents;
6735 /* 1 empty bucket. */
6736 bfd_put_32 (output_bfd, 1, contents);
6737 /* SYMIDX above the special symbol 0. */
6738 bfd_put_32 (output_bfd, 1, contents + 4);
6739 /* Just one word for bitmask. */
6740 bfd_put_32 (output_bfd, 1, contents + 8);
6741 /* Only hash fn bloom filter. */
6742 bfd_put_32 (output_bfd, 0, contents + 12);
6743 /* No hashes are valid - empty bitmask. */
6744 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6745 /* No hashes in the only bucket. */
6746 bfd_put_32 (output_bfd, 0,
6747 contents + 16 + bed->s->arch_size / 8);
6751 unsigned long int maskwords, maskbitslog2, x;
6752 BFD_ASSERT (cinfo.min_dynindx != -1);
6756 while ((x >>= 1) != 0)
6758 if (maskbitslog2 < 3)
6760 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6761 maskbitslog2 = maskbitslog2 + 3;
6763 maskbitslog2 = maskbitslog2 + 2;
6764 if (bed->s->arch_size == 64)
6766 if (maskbitslog2 == 5)
6772 cinfo.mask = (1 << cinfo.shift1) - 1;
6773 cinfo.shift2 = maskbitslog2;
6774 cinfo.maskbits = 1 << maskbitslog2;
6775 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6776 amt = bucketcount * sizeof (unsigned long int) * 2;
6777 amt += maskwords * sizeof (bfd_vma);
6778 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6779 if (cinfo.bitmask == NULL)
6781 free (cinfo.hashcodes);
6785 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6786 cinfo.indx = cinfo.counts + bucketcount;
6787 cinfo.symindx = dynsymcount - cinfo.nsyms;
6788 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6790 /* Determine how often each hash bucket is used. */
6791 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6792 for (i = 0; i < cinfo.nsyms; ++i)
6793 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6795 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6796 if (cinfo.counts[i] != 0)
6798 cinfo.indx[i] = cnt;
6799 cnt += cinfo.counts[i];
6801 BFD_ASSERT (cnt == dynsymcount);
6802 cinfo.bucketcount = bucketcount;
6803 cinfo.local_indx = cinfo.min_dynindx;
6805 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6806 s->size += cinfo.maskbits / 8;
6807 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6808 if (contents == NULL)
6810 free (cinfo.bitmask);
6811 free (cinfo.hashcodes);
6815 s->contents = contents;
6816 bfd_put_32 (output_bfd, bucketcount, contents);
6817 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6818 bfd_put_32 (output_bfd, maskwords, contents + 8);
6819 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6820 contents += 16 + cinfo.maskbits / 8;
6822 for (i = 0; i < bucketcount; ++i)
6824 if (cinfo.counts[i] == 0)
6825 bfd_put_32 (output_bfd, 0, contents);
6827 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6831 cinfo.contents = contents;
6833 /* Renumber dynamic symbols, populate .gnu.hash section. */
6834 elf_link_hash_traverse (elf_hash_table (info),
6835 elf_renumber_gnu_hash_syms, &cinfo);
6837 contents = s->contents + 16;
6838 for (i = 0; i < maskwords; ++i)
6840 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6842 contents += bed->s->arch_size / 8;
6845 free (cinfo.bitmask);
6846 free (cinfo.hashcodes);
6850 s = bfd_get_linker_section (dynobj, ".dynstr");
6851 BFD_ASSERT (s != NULL);
6853 elf_finalize_dynstr (output_bfd, info);
6855 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6857 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6858 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6865 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6868 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6871 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6872 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6875 /* Finish SHF_MERGE section merging. */
6878 _bfd_elf_merge_sections (bfd *obfd, struct bfd_link_info *info)
6883 if (!is_elf_hash_table (info->hash))
6886 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6887 if ((ibfd->flags & DYNAMIC) == 0
6888 && bfd_get_flavour (ibfd) == bfd_target_elf_flavour
6889 && (elf_elfheader (ibfd)->e_ident[EI_CLASS]
6890 == get_elf_backend_data (obfd)->s->elfclass))
6891 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6892 if ((sec->flags & SEC_MERGE) != 0
6893 && !bfd_is_abs_section (sec->output_section))
6895 struct bfd_elf_section_data *secdata;
6897 secdata = elf_section_data (sec);
6898 if (! _bfd_add_merge_section (obfd,
6899 &elf_hash_table (info)->merge_info,
6900 sec, &secdata->sec_info))
6902 else if (secdata->sec_info)
6903 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6906 if (elf_hash_table (info)->merge_info != NULL)
6907 _bfd_merge_sections (obfd, info, elf_hash_table (info)->merge_info,
6908 merge_sections_remove_hook);
6912 /* Create an entry in an ELF linker hash table. */
6914 struct bfd_hash_entry *
6915 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6916 struct bfd_hash_table *table,
6919 /* Allocate the structure if it has not already been allocated by a
6923 entry = (struct bfd_hash_entry *)
6924 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6929 /* Call the allocation method of the superclass. */
6930 entry = _bfd_link_hash_newfunc (entry, table, string);
6933 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6934 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6936 /* Set local fields. */
6939 ret->got = htab->init_got_refcount;
6940 ret->plt = htab->init_plt_refcount;
6941 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6942 - offsetof (struct elf_link_hash_entry, size)));
6943 /* Assume that we have been called by a non-ELF symbol reader.
6944 This flag is then reset by the code which reads an ELF input
6945 file. This ensures that a symbol created by a non-ELF symbol
6946 reader will have the flag set correctly. */
6953 /* Copy data from an indirect symbol to its direct symbol, hiding the
6954 old indirect symbol. Also used for copying flags to a weakdef. */
6957 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6958 struct elf_link_hash_entry *dir,
6959 struct elf_link_hash_entry *ind)
6961 struct elf_link_hash_table *htab;
6963 /* Copy down any references that we may have already seen to the
6964 symbol which just became indirect if DIR isn't a hidden versioned
6967 if (dir->versioned != versioned_hidden)
6969 dir->ref_dynamic |= ind->ref_dynamic;
6970 dir->ref_regular |= ind->ref_regular;
6971 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6972 dir->non_got_ref |= ind->non_got_ref;
6973 dir->needs_plt |= ind->needs_plt;
6974 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6977 if (ind->root.type != bfd_link_hash_indirect)
6980 /* Copy over the global and procedure linkage table refcount entries.
6981 These may have been already set up by a check_relocs routine. */
6982 htab = elf_hash_table (info);
6983 if (ind->got.refcount > htab->init_got_refcount.refcount)
6985 if (dir->got.refcount < 0)
6986 dir->got.refcount = 0;
6987 dir->got.refcount += ind->got.refcount;
6988 ind->got.refcount = htab->init_got_refcount.refcount;
6991 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6993 if (dir->plt.refcount < 0)
6994 dir->plt.refcount = 0;
6995 dir->plt.refcount += ind->plt.refcount;
6996 ind->plt.refcount = htab->init_plt_refcount.refcount;
6999 if (ind->dynindx != -1)
7001 if (dir->dynindx != -1)
7002 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
7003 dir->dynindx = ind->dynindx;
7004 dir->dynstr_index = ind->dynstr_index;
7006 ind->dynstr_index = 0;
7011 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
7012 struct elf_link_hash_entry *h,
7013 bfd_boolean force_local)
7015 /* STT_GNU_IFUNC symbol must go through PLT. */
7016 if (h->type != STT_GNU_IFUNC)
7018 h->plt = elf_hash_table (info)->init_plt_offset;
7023 h->forced_local = 1;
7024 if (h->dynindx != -1)
7027 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
7033 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7037 _bfd_elf_link_hash_table_init
7038 (struct elf_link_hash_table *table,
7040 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
7041 struct bfd_hash_table *,
7043 unsigned int entsize,
7044 enum elf_target_id target_id)
7047 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
7049 table->init_got_refcount.refcount = can_refcount - 1;
7050 table->init_plt_refcount.refcount = can_refcount - 1;
7051 table->init_got_offset.offset = -(bfd_vma) 1;
7052 table->init_plt_offset.offset = -(bfd_vma) 1;
7053 /* The first dynamic symbol is a dummy. */
7054 table->dynsymcount = 1;
7056 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
7058 table->root.type = bfd_link_elf_hash_table;
7059 table->hash_table_id = target_id;
7064 /* Create an ELF linker hash table. */
7066 struct bfd_link_hash_table *
7067 _bfd_elf_link_hash_table_create (bfd *abfd)
7069 struct elf_link_hash_table *ret;
7070 bfd_size_type amt = sizeof (struct elf_link_hash_table);
7072 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
7076 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
7077 sizeof (struct elf_link_hash_entry),
7083 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
7088 /* Destroy an ELF linker hash table. */
7091 _bfd_elf_link_hash_table_free (bfd *obfd)
7093 struct elf_link_hash_table *htab;
7095 htab = (struct elf_link_hash_table *) obfd->link.hash;
7096 if (htab->dynstr != NULL)
7097 _bfd_elf_strtab_free (htab->dynstr);
7098 _bfd_merge_sections_free (htab->merge_info);
7099 _bfd_generic_link_hash_table_free (obfd);
7102 /* This is a hook for the ELF emulation code in the generic linker to
7103 tell the backend linker what file name to use for the DT_NEEDED
7104 entry for a dynamic object. */
7107 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
7109 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7110 && bfd_get_format (abfd) == bfd_object)
7111 elf_dt_name (abfd) = name;
7115 bfd_elf_get_dyn_lib_class (bfd *abfd)
7118 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7119 && bfd_get_format (abfd) == bfd_object)
7120 lib_class = elf_dyn_lib_class (abfd);
7127 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
7129 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7130 && bfd_get_format (abfd) == bfd_object)
7131 elf_dyn_lib_class (abfd) = lib_class;
7134 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7135 the linker ELF emulation code. */
7137 struct bfd_link_needed_list *
7138 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
7139 struct bfd_link_info *info)
7141 if (! is_elf_hash_table (info->hash))
7143 return elf_hash_table (info)->needed;
7146 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7147 hook for the linker ELF emulation code. */
7149 struct bfd_link_needed_list *
7150 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
7151 struct bfd_link_info *info)
7153 if (! is_elf_hash_table (info->hash))
7155 return elf_hash_table (info)->runpath;
7158 /* Get the name actually used for a dynamic object for a link. This
7159 is the SONAME entry if there is one. Otherwise, it is the string
7160 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7163 bfd_elf_get_dt_soname (bfd *abfd)
7165 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7166 && bfd_get_format (abfd) == bfd_object)
7167 return elf_dt_name (abfd);
7171 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7172 the ELF linker emulation code. */
7175 bfd_elf_get_bfd_needed_list (bfd *abfd,
7176 struct bfd_link_needed_list **pneeded)
7179 bfd_byte *dynbuf = NULL;
7180 unsigned int elfsec;
7181 unsigned long shlink;
7182 bfd_byte *extdyn, *extdynend;
7184 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
7188 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
7189 || bfd_get_format (abfd) != bfd_object)
7192 s = bfd_get_section_by_name (abfd, ".dynamic");
7193 if (s == NULL || s->size == 0)
7196 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
7199 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
7200 if (elfsec == SHN_BAD)
7203 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
7205 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
7206 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
7209 extdynend = extdyn + s->size;
7210 for (; extdyn < extdynend; extdyn += extdynsize)
7212 Elf_Internal_Dyn dyn;
7214 (*swap_dyn_in) (abfd, extdyn, &dyn);
7216 if (dyn.d_tag == DT_NULL)
7219 if (dyn.d_tag == DT_NEEDED)
7222 struct bfd_link_needed_list *l;
7223 unsigned int tagv = dyn.d_un.d_val;
7226 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7231 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7252 struct elf_symbuf_symbol
7254 unsigned long st_name; /* Symbol name, index in string tbl */
7255 unsigned char st_info; /* Type and binding attributes */
7256 unsigned char st_other; /* Visibilty, and target specific */
7259 struct elf_symbuf_head
7261 struct elf_symbuf_symbol *ssym;
7262 bfd_size_type count;
7263 unsigned int st_shndx;
7270 Elf_Internal_Sym *isym;
7271 struct elf_symbuf_symbol *ssym;
7276 /* Sort references to symbols by ascending section number. */
7279 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7281 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7282 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7284 return s1->st_shndx - s2->st_shndx;
7288 elf_sym_name_compare (const void *arg1, const void *arg2)
7290 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7291 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7292 return strcmp (s1->name, s2->name);
7295 static struct elf_symbuf_head *
7296 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7298 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7299 struct elf_symbuf_symbol *ssym;
7300 struct elf_symbuf_head *ssymbuf, *ssymhead;
7301 bfd_size_type i, shndx_count, total_size;
7303 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7307 for (ind = indbuf, i = 0; i < symcount; i++)
7308 if (isymbuf[i].st_shndx != SHN_UNDEF)
7309 *ind++ = &isymbuf[i];
7312 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7313 elf_sort_elf_symbol);
7316 if (indbufend > indbuf)
7317 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7318 if (ind[0]->st_shndx != ind[1]->st_shndx)
7321 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7322 + (indbufend - indbuf) * sizeof (*ssym));
7323 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7324 if (ssymbuf == NULL)
7330 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7331 ssymbuf->ssym = NULL;
7332 ssymbuf->count = shndx_count;
7333 ssymbuf->st_shndx = 0;
7334 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7336 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7339 ssymhead->ssym = ssym;
7340 ssymhead->count = 0;
7341 ssymhead->st_shndx = (*ind)->st_shndx;
7343 ssym->st_name = (*ind)->st_name;
7344 ssym->st_info = (*ind)->st_info;
7345 ssym->st_other = (*ind)->st_other;
7348 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7349 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7356 /* Check if 2 sections define the same set of local and global
7360 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7361 struct bfd_link_info *info)
7364 const struct elf_backend_data *bed1, *bed2;
7365 Elf_Internal_Shdr *hdr1, *hdr2;
7366 bfd_size_type symcount1, symcount2;
7367 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7368 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7369 Elf_Internal_Sym *isym, *isymend;
7370 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7371 bfd_size_type count1, count2, i;
7372 unsigned int shndx1, shndx2;
7378 /* Both sections have to be in ELF. */
7379 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7380 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7383 if (elf_section_type (sec1) != elf_section_type (sec2))
7386 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7387 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7388 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7391 bed1 = get_elf_backend_data (bfd1);
7392 bed2 = get_elf_backend_data (bfd2);
7393 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7394 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7395 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7396 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7398 if (symcount1 == 0 || symcount2 == 0)
7404 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7405 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7407 if (ssymbuf1 == NULL)
7409 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7411 if (isymbuf1 == NULL)
7414 if (!info->reduce_memory_overheads)
7415 elf_tdata (bfd1)->symbuf = ssymbuf1
7416 = elf_create_symbuf (symcount1, isymbuf1);
7419 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7421 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7423 if (isymbuf2 == NULL)
7426 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7427 elf_tdata (bfd2)->symbuf = ssymbuf2
7428 = elf_create_symbuf (symcount2, isymbuf2);
7431 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7433 /* Optimized faster version. */
7434 bfd_size_type lo, hi, mid;
7435 struct elf_symbol *symp;
7436 struct elf_symbuf_symbol *ssym, *ssymend;
7439 hi = ssymbuf1->count;
7444 mid = (lo + hi) / 2;
7445 if (shndx1 < ssymbuf1[mid].st_shndx)
7447 else if (shndx1 > ssymbuf1[mid].st_shndx)
7451 count1 = ssymbuf1[mid].count;
7458 hi = ssymbuf2->count;
7463 mid = (lo + hi) / 2;
7464 if (shndx2 < ssymbuf2[mid].st_shndx)
7466 else if (shndx2 > ssymbuf2[mid].st_shndx)
7470 count2 = ssymbuf2[mid].count;
7476 if (count1 == 0 || count2 == 0 || count1 != count2)
7480 = (struct elf_symbol *) bfd_malloc (count1 * sizeof (*symtable1));
7482 = (struct elf_symbol *) bfd_malloc (count2 * sizeof (*symtable2));
7483 if (symtable1 == NULL || symtable2 == NULL)
7487 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7488 ssym < ssymend; ssym++, symp++)
7490 symp->u.ssym = ssym;
7491 symp->name = bfd_elf_string_from_elf_section (bfd1,
7497 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7498 ssym < ssymend; ssym++, symp++)
7500 symp->u.ssym = ssym;
7501 symp->name = bfd_elf_string_from_elf_section (bfd2,
7506 /* Sort symbol by name. */
7507 qsort (symtable1, count1, sizeof (struct elf_symbol),
7508 elf_sym_name_compare);
7509 qsort (symtable2, count1, sizeof (struct elf_symbol),
7510 elf_sym_name_compare);
7512 for (i = 0; i < count1; i++)
7513 /* Two symbols must have the same binding, type and name. */
7514 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7515 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7516 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7523 symtable1 = (struct elf_symbol *)
7524 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7525 symtable2 = (struct elf_symbol *)
7526 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7527 if (symtable1 == NULL || symtable2 == NULL)
7530 /* Count definitions in the section. */
7532 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7533 if (isym->st_shndx == shndx1)
7534 symtable1[count1++].u.isym = isym;
7537 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7538 if (isym->st_shndx == shndx2)
7539 symtable2[count2++].u.isym = isym;
7541 if (count1 == 0 || count2 == 0 || count1 != count2)
7544 for (i = 0; i < count1; i++)
7546 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7547 symtable1[i].u.isym->st_name);
7549 for (i = 0; i < count2; i++)
7551 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7552 symtable2[i].u.isym->st_name);
7554 /* Sort symbol by name. */
7555 qsort (symtable1, count1, sizeof (struct elf_symbol),
7556 elf_sym_name_compare);
7557 qsort (symtable2, count1, sizeof (struct elf_symbol),
7558 elf_sym_name_compare);
7560 for (i = 0; i < count1; i++)
7561 /* Two symbols must have the same binding, type and name. */
7562 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7563 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7564 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7582 /* Return TRUE if 2 section types are compatible. */
7585 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7586 bfd *bbfd, const asection *bsec)
7590 || abfd->xvec->flavour != bfd_target_elf_flavour
7591 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7594 return elf_section_type (asec) == elf_section_type (bsec);
7597 /* Final phase of ELF linker. */
7599 /* A structure we use to avoid passing large numbers of arguments. */
7601 struct elf_final_link_info
7603 /* General link information. */
7604 struct bfd_link_info *info;
7607 /* Symbol string table. */
7608 struct elf_strtab_hash *symstrtab;
7609 /* .hash section. */
7611 /* symbol version section (.gnu.version). */
7612 asection *symver_sec;
7613 /* Buffer large enough to hold contents of any section. */
7615 /* Buffer large enough to hold external relocs of any section. */
7616 void *external_relocs;
7617 /* Buffer large enough to hold internal relocs of any section. */
7618 Elf_Internal_Rela *internal_relocs;
7619 /* Buffer large enough to hold external local symbols of any input
7621 bfd_byte *external_syms;
7622 /* And a buffer for symbol section indices. */
7623 Elf_External_Sym_Shndx *locsym_shndx;
7624 /* Buffer large enough to hold internal local symbols of any input
7626 Elf_Internal_Sym *internal_syms;
7627 /* Array large enough to hold a symbol index for each local symbol
7628 of any input BFD. */
7630 /* Array large enough to hold a section pointer for each local
7631 symbol of any input BFD. */
7632 asection **sections;
7633 /* Buffer for SHT_SYMTAB_SHNDX section. */
7634 Elf_External_Sym_Shndx *symshndxbuf;
7635 /* Number of STT_FILE syms seen. */
7636 size_t filesym_count;
7639 /* This struct is used to pass information to elf_link_output_extsym. */
7641 struct elf_outext_info
7644 bfd_boolean localsyms;
7645 bfd_boolean file_sym_done;
7646 struct elf_final_link_info *flinfo;
7650 /* Support for evaluating a complex relocation.
7652 Complex relocations are generalized, self-describing relocations. The
7653 implementation of them consists of two parts: complex symbols, and the
7654 relocations themselves.
7656 The relocations are use a reserved elf-wide relocation type code (R_RELC
7657 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7658 information (start bit, end bit, word width, etc) into the addend. This
7659 information is extracted from CGEN-generated operand tables within gas.
7661 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7662 internal) representing prefix-notation expressions, including but not
7663 limited to those sorts of expressions normally encoded as addends in the
7664 addend field. The symbol mangling format is:
7667 | <unary-operator> ':' <node>
7668 | <binary-operator> ':' <node> ':' <node>
7671 <literal> := 's' <digits=N> ':' <N character symbol name>
7672 | 'S' <digits=N> ':' <N character section name>
7676 <binary-operator> := as in C
7677 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7680 set_symbol_value (bfd *bfd_with_globals,
7681 Elf_Internal_Sym *isymbuf,
7686 struct elf_link_hash_entry **sym_hashes;
7687 struct elf_link_hash_entry *h;
7688 size_t extsymoff = locsymcount;
7690 if (symidx < locsymcount)
7692 Elf_Internal_Sym *sym;
7694 sym = isymbuf + symidx;
7695 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7697 /* It is a local symbol: move it to the
7698 "absolute" section and give it a value. */
7699 sym->st_shndx = SHN_ABS;
7700 sym->st_value = val;
7703 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7707 /* It is a global symbol: set its link type
7708 to "defined" and give it a value. */
7710 sym_hashes = elf_sym_hashes (bfd_with_globals);
7711 h = sym_hashes [symidx - extsymoff];
7712 while (h->root.type == bfd_link_hash_indirect
7713 || h->root.type == bfd_link_hash_warning)
7714 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7715 h->root.type = bfd_link_hash_defined;
7716 h->root.u.def.value = val;
7717 h->root.u.def.section = bfd_abs_section_ptr;
7721 resolve_symbol (const char *name,
7723 struct elf_final_link_info *flinfo,
7725 Elf_Internal_Sym *isymbuf,
7728 Elf_Internal_Sym *sym;
7729 struct bfd_link_hash_entry *global_entry;
7730 const char *candidate = NULL;
7731 Elf_Internal_Shdr *symtab_hdr;
7734 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7736 for (i = 0; i < locsymcount; ++ i)
7740 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7743 candidate = bfd_elf_string_from_elf_section (input_bfd,
7744 symtab_hdr->sh_link,
7747 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7748 name, candidate, (unsigned long) sym->st_value);
7750 if (candidate && strcmp (candidate, name) == 0)
7752 asection *sec = flinfo->sections [i];
7754 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7755 *result += sec->output_offset + sec->output_section->vma;
7757 printf ("Found symbol with value %8.8lx\n",
7758 (unsigned long) *result);
7764 /* Hmm, haven't found it yet. perhaps it is a global. */
7765 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7766 FALSE, FALSE, TRUE);
7770 if (global_entry->type == bfd_link_hash_defined
7771 || global_entry->type == bfd_link_hash_defweak)
7773 *result = (global_entry->u.def.value
7774 + global_entry->u.def.section->output_section->vma
7775 + global_entry->u.def.section->output_offset);
7777 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7778 global_entry->root.string, (unsigned long) *result);
7786 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
7787 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
7788 names like "foo.end" which is the end address of section "foo". */
7791 resolve_section (const char *name,
7799 for (curr = sections; curr; curr = curr->next)
7800 if (strcmp (curr->name, name) == 0)
7802 *result = curr->vma;
7806 /* Hmm. still haven't found it. try pseudo-section names. */
7807 /* FIXME: This could be coded more efficiently... */
7808 for (curr = sections; curr; curr = curr->next)
7810 len = strlen (curr->name);
7811 if (len > strlen (name))
7814 if (strncmp (curr->name, name, len) == 0)
7816 if (strncmp (".end", name + len, 4) == 0)
7818 *result = curr->vma + curr->size / bfd_octets_per_byte (abfd);
7822 /* Insert more pseudo-section names here, if you like. */
7830 undefined_reference (const char *reftype, const char *name)
7832 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7837 eval_symbol (bfd_vma *result,
7840 struct elf_final_link_info *flinfo,
7842 Elf_Internal_Sym *isymbuf,
7851 const char *sym = *symp;
7853 bfd_boolean symbol_is_section = FALSE;
7858 if (len < 1 || len > sizeof (symbuf))
7860 bfd_set_error (bfd_error_invalid_operation);
7873 *result = strtoul (sym, (char **) symp, 16);
7877 symbol_is_section = TRUE;
7880 symlen = strtol (sym, (char **) symp, 10);
7881 sym = *symp + 1; /* Skip the trailing ':'. */
7883 if (symend < sym || symlen + 1 > sizeof (symbuf))
7885 bfd_set_error (bfd_error_invalid_operation);
7889 memcpy (symbuf, sym, symlen);
7890 symbuf[symlen] = '\0';
7891 *symp = sym + symlen;
7893 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7894 the symbol as a section, or vice-versa. so we're pretty liberal in our
7895 interpretation here; section means "try section first", not "must be a
7896 section", and likewise with symbol. */
7898 if (symbol_is_section)
7900 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result, input_bfd)
7901 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7902 isymbuf, locsymcount))
7904 undefined_reference ("section", symbuf);
7910 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7911 isymbuf, locsymcount)
7912 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7915 undefined_reference ("symbol", symbuf);
7922 /* All that remains are operators. */
7924 #define UNARY_OP(op) \
7925 if (strncmp (sym, #op, strlen (#op)) == 0) \
7927 sym += strlen (#op); \
7931 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7932 isymbuf, locsymcount, signed_p)) \
7935 *result = op ((bfd_signed_vma) a); \
7941 #define BINARY_OP(op) \
7942 if (strncmp (sym, #op, strlen (#op)) == 0) \
7944 sym += strlen (#op); \
7948 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7949 isymbuf, locsymcount, signed_p)) \
7952 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7953 isymbuf, locsymcount, signed_p)) \
7956 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7986 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7987 bfd_set_error (bfd_error_invalid_operation);
7993 put_value (bfd_vma size,
7994 unsigned long chunksz,
7999 location += (size - chunksz);
8001 for (; size; size -= chunksz, location -= chunksz)
8006 bfd_put_8 (input_bfd, x, location);
8010 bfd_put_16 (input_bfd, x, location);
8014 bfd_put_32 (input_bfd, x, location);
8015 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8021 bfd_put_64 (input_bfd, x, location);
8022 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8035 get_value (bfd_vma size,
8036 unsigned long chunksz,
8043 /* Sanity checks. */
8044 BFD_ASSERT (chunksz <= sizeof (x)
8047 && (size % chunksz) == 0
8048 && input_bfd != NULL
8049 && location != NULL);
8051 if (chunksz == sizeof (x))
8053 BFD_ASSERT (size == chunksz);
8055 /* Make sure that we do not perform an undefined shift operation.
8056 We know that size == chunksz so there will only be one iteration
8057 of the loop below. */
8061 shift = 8 * chunksz;
8063 for (; size; size -= chunksz, location += chunksz)
8068 x = (x << shift) | bfd_get_8 (input_bfd, location);
8071 x = (x << shift) | bfd_get_16 (input_bfd, location);
8074 x = (x << shift) | bfd_get_32 (input_bfd, location);
8078 x = (x << shift) | bfd_get_64 (input_bfd, location);
8089 decode_complex_addend (unsigned long *start, /* in bits */
8090 unsigned long *oplen, /* in bits */
8091 unsigned long *len, /* in bits */
8092 unsigned long *wordsz, /* in bytes */
8093 unsigned long *chunksz, /* in bytes */
8094 unsigned long *lsb0_p,
8095 unsigned long *signed_p,
8096 unsigned long *trunc_p,
8097 unsigned long encoded)
8099 * start = encoded & 0x3F;
8100 * len = (encoded >> 6) & 0x3F;
8101 * oplen = (encoded >> 12) & 0x3F;
8102 * wordsz = (encoded >> 18) & 0xF;
8103 * chunksz = (encoded >> 22) & 0xF;
8104 * lsb0_p = (encoded >> 27) & 1;
8105 * signed_p = (encoded >> 28) & 1;
8106 * trunc_p = (encoded >> 29) & 1;
8109 bfd_reloc_status_type
8110 bfd_elf_perform_complex_relocation (bfd *input_bfd,
8111 asection *input_section ATTRIBUTE_UNUSED,
8113 Elf_Internal_Rela *rel,
8116 bfd_vma shift, x, mask;
8117 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
8118 bfd_reloc_status_type r;
8120 /* Perform this reloc, since it is complex.
8121 (this is not to say that it necessarily refers to a complex
8122 symbol; merely that it is a self-describing CGEN based reloc.
8123 i.e. the addend has the complete reloc information (bit start, end,
8124 word size, etc) encoded within it.). */
8126 decode_complex_addend (&start, &oplen, &len, &wordsz,
8127 &chunksz, &lsb0_p, &signed_p,
8128 &trunc_p, rel->r_addend);
8130 mask = (((1L << (len - 1)) - 1) << 1) | 1;
8133 shift = (start + 1) - len;
8135 shift = (8 * wordsz) - (start + len);
8137 x = get_value (wordsz, chunksz, input_bfd,
8138 contents + rel->r_offset * bfd_octets_per_byte (input_bfd));
8141 printf ("Doing complex reloc: "
8142 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8143 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8144 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8145 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
8146 oplen, (unsigned long) x, (unsigned long) mask,
8147 (unsigned long) relocation);
8152 /* Now do an overflow check. */
8153 r = bfd_check_overflow ((signed_p
8154 ? complain_overflow_signed
8155 : complain_overflow_unsigned),
8156 len, 0, (8 * wordsz),
8160 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
8163 printf (" relocation: %8.8lx\n"
8164 " shifted mask: %8.8lx\n"
8165 " shifted/masked reloc: %8.8lx\n"
8166 " result: %8.8lx\n",
8167 (unsigned long) relocation, (unsigned long) (mask << shift),
8168 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
8170 put_value (wordsz, chunksz, input_bfd, x,
8171 contents + rel->r_offset * bfd_octets_per_byte (input_bfd));
8175 /* Functions to read r_offset from external (target order) reloc
8176 entry. Faster than bfd_getl32 et al, because we let the compiler
8177 know the value is aligned. */
8180 ext32l_r_offset (const void *p)
8187 const union aligned32 *a
8188 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8190 uint32_t aval = ( (uint32_t) a->c[0]
8191 | (uint32_t) a->c[1] << 8
8192 | (uint32_t) a->c[2] << 16
8193 | (uint32_t) a->c[3] << 24);
8198 ext32b_r_offset (const void *p)
8205 const union aligned32 *a
8206 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8208 uint32_t aval = ( (uint32_t) a->c[0] << 24
8209 | (uint32_t) a->c[1] << 16
8210 | (uint32_t) a->c[2] << 8
8211 | (uint32_t) a->c[3]);
8215 #ifdef BFD_HOST_64_BIT
8217 ext64l_r_offset (const void *p)
8224 const union aligned64 *a
8225 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8227 uint64_t aval = ( (uint64_t) a->c[0]
8228 | (uint64_t) a->c[1] << 8
8229 | (uint64_t) a->c[2] << 16
8230 | (uint64_t) a->c[3] << 24
8231 | (uint64_t) a->c[4] << 32
8232 | (uint64_t) a->c[5] << 40
8233 | (uint64_t) a->c[6] << 48
8234 | (uint64_t) a->c[7] << 56);
8239 ext64b_r_offset (const void *p)
8246 const union aligned64 *a
8247 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8249 uint64_t aval = ( (uint64_t) a->c[0] << 56
8250 | (uint64_t) a->c[1] << 48
8251 | (uint64_t) a->c[2] << 40
8252 | (uint64_t) a->c[3] << 32
8253 | (uint64_t) a->c[4] << 24
8254 | (uint64_t) a->c[5] << 16
8255 | (uint64_t) a->c[6] << 8
8256 | (uint64_t) a->c[7]);
8261 /* When performing a relocatable link, the input relocations are
8262 preserved. But, if they reference global symbols, the indices
8263 referenced must be updated. Update all the relocations found in
8267 elf_link_adjust_relocs (bfd *abfd,
8268 struct bfd_elf_section_reloc_data *reldata,
8272 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8274 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8275 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8276 bfd_vma r_type_mask;
8278 unsigned int count = reldata->count;
8279 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8281 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8283 swap_in = bed->s->swap_reloc_in;
8284 swap_out = bed->s->swap_reloc_out;
8286 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8288 swap_in = bed->s->swap_reloca_in;
8289 swap_out = bed->s->swap_reloca_out;
8294 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8297 if (bed->s->arch_size == 32)
8304 r_type_mask = 0xffffffff;
8308 erela = reldata->hdr->contents;
8309 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8311 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8314 if (*rel_hash == NULL)
8317 BFD_ASSERT ((*rel_hash)->indx >= 0);
8319 (*swap_in) (abfd, erela, irela);
8320 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8321 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8322 | (irela[j].r_info & r_type_mask));
8323 (*swap_out) (abfd, irela, erela);
8326 if (sort && count != 0)
8328 bfd_vma (*ext_r_off) (const void *);
8331 bfd_byte *base, *end, *p, *loc;
8332 bfd_byte *buf = NULL;
8334 if (bed->s->arch_size == 32)
8336 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8337 ext_r_off = ext32l_r_offset;
8338 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8339 ext_r_off = ext32b_r_offset;
8345 #ifdef BFD_HOST_64_BIT
8346 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8347 ext_r_off = ext64l_r_offset;
8348 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8349 ext_r_off = ext64b_r_offset;
8355 /* Must use a stable sort here. A modified insertion sort,
8356 since the relocs are mostly sorted already. */
8357 elt_size = reldata->hdr->sh_entsize;
8358 base = reldata->hdr->contents;
8359 end = base + count * elt_size;
8360 if (elt_size > sizeof (Elf64_External_Rela))
8363 /* Ensure the first element is lowest. This acts as a sentinel,
8364 speeding the main loop below. */
8365 r_off = (*ext_r_off) (base);
8366 for (p = loc = base; (p += elt_size) < end; )
8368 bfd_vma r_off2 = (*ext_r_off) (p);
8377 /* Don't just swap *base and *loc as that changes the order
8378 of the original base[0] and base[1] if they happen to
8379 have the same r_offset. */
8380 bfd_byte onebuf[sizeof (Elf64_External_Rela)];
8381 memcpy (onebuf, loc, elt_size);
8382 memmove (base + elt_size, base, loc - base);
8383 memcpy (base, onebuf, elt_size);
8386 for (p = base + elt_size; (p += elt_size) < end; )
8388 /* base to p is sorted, *p is next to insert. */
8389 r_off = (*ext_r_off) (p);
8390 /* Search the sorted region for location to insert. */
8392 while (r_off < (*ext_r_off) (loc))
8397 /* Chances are there is a run of relocs to insert here,
8398 from one of more input files. Files are not always
8399 linked in order due to the way elf_link_input_bfd is
8400 called. See pr17666. */
8401 size_t sortlen = p - loc;
8402 bfd_vma r_off2 = (*ext_r_off) (loc);
8403 size_t runlen = elt_size;
8404 size_t buf_size = 96 * 1024;
8405 while (p + runlen < end
8406 && (sortlen <= buf_size
8407 || runlen + elt_size <= buf_size)
8408 && r_off2 > (*ext_r_off) (p + runlen))
8412 buf = bfd_malloc (buf_size);
8416 if (runlen < sortlen)
8418 memcpy (buf, p, runlen);
8419 memmove (loc + runlen, loc, sortlen);
8420 memcpy (loc, buf, runlen);
8424 memcpy (buf, loc, sortlen);
8425 memmove (loc, p, runlen);
8426 memcpy (loc + runlen, buf, sortlen);
8428 p += runlen - elt_size;
8431 /* Hashes are no longer valid. */
8432 free (reldata->hashes);
8433 reldata->hashes = NULL;
8439 struct elf_link_sort_rela
8445 enum elf_reloc_type_class type;
8446 /* We use this as an array of size int_rels_per_ext_rel. */
8447 Elf_Internal_Rela rela[1];
8451 elf_link_sort_cmp1 (const void *A, const void *B)
8453 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8454 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8455 int relativea, relativeb;
8457 relativea = a->type == reloc_class_relative;
8458 relativeb = b->type == reloc_class_relative;
8460 if (relativea < relativeb)
8462 if (relativea > relativeb)
8464 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8466 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8468 if (a->rela->r_offset < b->rela->r_offset)
8470 if (a->rela->r_offset > b->rela->r_offset)
8476 elf_link_sort_cmp2 (const void *A, const void *B)
8478 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8479 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8481 if (a->type < b->type)
8483 if (a->type > b->type)
8485 if (a->u.offset < b->u.offset)
8487 if (a->u.offset > b->u.offset)
8489 if (a->rela->r_offset < b->rela->r_offset)
8491 if (a->rela->r_offset > b->rela->r_offset)
8497 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8499 asection *dynamic_relocs;
8502 bfd_size_type count, size;
8503 size_t i, ret, sort_elt, ext_size;
8504 bfd_byte *sort, *s_non_relative, *p;
8505 struct elf_link_sort_rela *sq;
8506 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8507 int i2e = bed->s->int_rels_per_ext_rel;
8508 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8509 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8510 struct bfd_link_order *lo;
8512 bfd_boolean use_rela;
8514 /* Find a dynamic reloc section. */
8515 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8516 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8517 if (rela_dyn != NULL && rela_dyn->size > 0
8518 && rel_dyn != NULL && rel_dyn->size > 0)
8520 bfd_boolean use_rela_initialised = FALSE;
8522 /* This is just here to stop gcc from complaining.
8523 It's initialization checking code is not perfect. */
8526 /* Both sections are present. Examine the sizes
8527 of the indirect sections to help us choose. */
8528 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8529 if (lo->type == bfd_indirect_link_order)
8531 asection *o = lo->u.indirect.section;
8533 if ((o->size % bed->s->sizeof_rela) == 0)
8535 if ((o->size % bed->s->sizeof_rel) == 0)
8536 /* Section size is divisible by both rel and rela sizes.
8537 It is of no help to us. */
8541 /* Section size is only divisible by rela. */
8542 if (use_rela_initialised && (use_rela == FALSE))
8545 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8546 bfd_set_error (bfd_error_invalid_operation);
8552 use_rela_initialised = TRUE;
8556 else if ((o->size % bed->s->sizeof_rel) == 0)
8558 /* Section size is only divisible by rel. */
8559 if (use_rela_initialised && (use_rela == TRUE))
8562 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8563 bfd_set_error (bfd_error_invalid_operation);
8569 use_rela_initialised = TRUE;
8574 /* The section size is not divisible by either - something is wrong. */
8576 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8577 bfd_set_error (bfd_error_invalid_operation);
8582 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8583 if (lo->type == bfd_indirect_link_order)
8585 asection *o = lo->u.indirect.section;
8587 if ((o->size % bed->s->sizeof_rela) == 0)
8589 if ((o->size % bed->s->sizeof_rel) == 0)
8590 /* Section size is divisible by both rel and rela sizes.
8591 It is of no help to us. */
8595 /* Section size is only divisible by rela. */
8596 if (use_rela_initialised && (use_rela == FALSE))
8599 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8600 bfd_set_error (bfd_error_invalid_operation);
8606 use_rela_initialised = TRUE;
8610 else if ((o->size % bed->s->sizeof_rel) == 0)
8612 /* Section size is only divisible by rel. */
8613 if (use_rela_initialised && (use_rela == TRUE))
8616 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8617 bfd_set_error (bfd_error_invalid_operation);
8623 use_rela_initialised = TRUE;
8628 /* The section size is not divisible by either - something is wrong. */
8630 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8631 bfd_set_error (bfd_error_invalid_operation);
8636 if (! use_rela_initialised)
8640 else if (rela_dyn != NULL && rela_dyn->size > 0)
8642 else if (rel_dyn != NULL && rel_dyn->size > 0)
8649 dynamic_relocs = rela_dyn;
8650 ext_size = bed->s->sizeof_rela;
8651 swap_in = bed->s->swap_reloca_in;
8652 swap_out = bed->s->swap_reloca_out;
8656 dynamic_relocs = rel_dyn;
8657 ext_size = bed->s->sizeof_rel;
8658 swap_in = bed->s->swap_reloc_in;
8659 swap_out = bed->s->swap_reloc_out;
8663 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8664 if (lo->type == bfd_indirect_link_order)
8665 size += lo->u.indirect.section->size;
8667 if (size != dynamic_relocs->size)
8670 sort_elt = (sizeof (struct elf_link_sort_rela)
8671 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8673 count = dynamic_relocs->size / ext_size;
8676 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8680 (*info->callbacks->warning)
8681 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8685 if (bed->s->arch_size == 32)
8686 r_sym_mask = ~(bfd_vma) 0xff;
8688 r_sym_mask = ~(bfd_vma) 0xffffffff;
8690 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8691 if (lo->type == bfd_indirect_link_order)
8693 bfd_byte *erel, *erelend;
8694 asection *o = lo->u.indirect.section;
8696 if (o->contents == NULL && o->size != 0)
8698 /* This is a reloc section that is being handled as a normal
8699 section. See bfd_section_from_shdr. We can't combine
8700 relocs in this case. */
8705 erelend = o->contents + o->size;
8706 /* FIXME: octets_per_byte. */
8707 p = sort + o->output_offset / ext_size * sort_elt;
8709 while (erel < erelend)
8711 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8713 (*swap_in) (abfd, erel, s->rela);
8714 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8715 s->u.sym_mask = r_sym_mask;
8721 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8723 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8725 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8726 if (s->type != reloc_class_relative)
8732 sq = (struct elf_link_sort_rela *) s_non_relative;
8733 for (; i < count; i++, p += sort_elt)
8735 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8736 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8738 sp->u.offset = sq->rela->r_offset;
8741 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8743 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8744 if (lo->type == bfd_indirect_link_order)
8746 bfd_byte *erel, *erelend;
8747 asection *o = lo->u.indirect.section;
8750 erelend = o->contents + o->size;
8751 /* FIXME: octets_per_byte. */
8752 p = sort + o->output_offset / ext_size * sort_elt;
8753 while (erel < erelend)
8755 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8756 (*swap_out) (abfd, s->rela, erel);
8763 *psec = dynamic_relocs;
8767 /* Add a symbol to the output symbol string table. */
8770 elf_link_output_symstrtab (struct elf_final_link_info *flinfo,
8772 Elf_Internal_Sym *elfsym,
8773 asection *input_sec,
8774 struct elf_link_hash_entry *h)
8776 int (*output_symbol_hook)
8777 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8778 struct elf_link_hash_entry *);
8779 struct elf_link_hash_table *hash_table;
8780 const struct elf_backend_data *bed;
8781 bfd_size_type strtabsize;
8783 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8785 bed = get_elf_backend_data (flinfo->output_bfd);
8786 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8787 if (output_symbol_hook != NULL)
8789 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8796 || (input_sec->flags & SEC_EXCLUDE))
8797 elfsym->st_name = (unsigned long) -1;
8800 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
8801 to get the final offset for st_name. */
8803 = (unsigned long) _bfd_elf_strtab_add (flinfo->symstrtab,
8805 if (elfsym->st_name == (unsigned long) -1)
8809 hash_table = elf_hash_table (flinfo->info);
8810 strtabsize = hash_table->strtabsize;
8811 if (strtabsize <= hash_table->strtabcount)
8813 strtabsize += strtabsize;
8814 hash_table->strtabsize = strtabsize;
8815 strtabsize *= sizeof (*hash_table->strtab);
8817 = (struct elf_sym_strtab *) bfd_realloc (hash_table->strtab,
8819 if (hash_table->strtab == NULL)
8822 hash_table->strtab[hash_table->strtabcount].sym = *elfsym;
8823 hash_table->strtab[hash_table->strtabcount].dest_index
8824 = hash_table->strtabcount;
8825 hash_table->strtab[hash_table->strtabcount].destshndx_index
8826 = flinfo->symshndxbuf ? bfd_get_symcount (flinfo->output_bfd) : 0;
8828 bfd_get_symcount (flinfo->output_bfd) += 1;
8829 hash_table->strtabcount += 1;
8834 /* Swap symbols out to the symbol table and flush the output symbols to
8838 elf_link_swap_symbols_out (struct elf_final_link_info *flinfo)
8840 struct elf_link_hash_table *hash_table = elf_hash_table (flinfo->info);
8841 bfd_size_type amt, i;
8842 const struct elf_backend_data *bed;
8844 Elf_Internal_Shdr *hdr;
8848 if (!hash_table->strtabcount)
8851 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8853 bed = get_elf_backend_data (flinfo->output_bfd);
8855 amt = bed->s->sizeof_sym * hash_table->strtabcount;
8856 symbuf = (bfd_byte *) bfd_malloc (amt);
8860 if (flinfo->symshndxbuf)
8862 amt = (sizeof (Elf_External_Sym_Shndx)
8863 * (bfd_get_symcount (flinfo->output_bfd)));
8864 flinfo->symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
8865 if (flinfo->symshndxbuf == NULL)
8872 for (i = 0; i < hash_table->strtabcount; i++)
8874 struct elf_sym_strtab *elfsym = &hash_table->strtab[i];
8875 if (elfsym->sym.st_name == (unsigned long) -1)
8876 elfsym->sym.st_name = 0;
8879 = (unsigned long) _bfd_elf_strtab_offset (flinfo->symstrtab,
8880 elfsym->sym.st_name);
8881 bed->s->swap_symbol_out (flinfo->output_bfd, &elfsym->sym,
8882 ((bfd_byte *) symbuf
8883 + (elfsym->dest_index
8884 * bed->s->sizeof_sym)),
8885 (flinfo->symshndxbuf
8886 + elfsym->destshndx_index));
8889 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8890 pos = hdr->sh_offset + hdr->sh_size;
8891 amt = hash_table->strtabcount * bed->s->sizeof_sym;
8892 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) == 0
8893 && bfd_bwrite (symbuf, amt, flinfo->output_bfd) == amt)
8895 hdr->sh_size += amt;
8903 free (hash_table->strtab);
8904 hash_table->strtab = NULL;
8909 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8912 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8914 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8915 && sym->st_shndx < SHN_LORESERVE)
8917 /* The gABI doesn't support dynamic symbols in output sections
8919 (*_bfd_error_handler)
8920 (_("%B: Too many sections: %d (>= %d)"),
8921 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8922 bfd_set_error (bfd_error_nonrepresentable_section);
8928 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8929 allowing an unsatisfied unversioned symbol in the DSO to match a
8930 versioned symbol that would normally require an explicit version.
8931 We also handle the case that a DSO references a hidden symbol
8932 which may be satisfied by a versioned symbol in another DSO. */
8935 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8936 const struct elf_backend_data *bed,
8937 struct elf_link_hash_entry *h)
8940 struct elf_link_loaded_list *loaded;
8942 if (!is_elf_hash_table (info->hash))
8945 /* Check indirect symbol. */
8946 while (h->root.type == bfd_link_hash_indirect)
8947 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8949 switch (h->root.type)
8955 case bfd_link_hash_undefined:
8956 case bfd_link_hash_undefweak:
8957 abfd = h->root.u.undef.abfd;
8958 if ((abfd->flags & DYNAMIC) == 0
8959 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8963 case bfd_link_hash_defined:
8964 case bfd_link_hash_defweak:
8965 abfd = h->root.u.def.section->owner;
8968 case bfd_link_hash_common:
8969 abfd = h->root.u.c.p->section->owner;
8972 BFD_ASSERT (abfd != NULL);
8974 for (loaded = elf_hash_table (info)->loaded;
8976 loaded = loaded->next)
8979 Elf_Internal_Shdr *hdr;
8980 bfd_size_type symcount;
8981 bfd_size_type extsymcount;
8982 bfd_size_type extsymoff;
8983 Elf_Internal_Shdr *versymhdr;
8984 Elf_Internal_Sym *isym;
8985 Elf_Internal_Sym *isymend;
8986 Elf_Internal_Sym *isymbuf;
8987 Elf_External_Versym *ever;
8988 Elf_External_Versym *extversym;
8990 input = loaded->abfd;
8992 /* We check each DSO for a possible hidden versioned definition. */
8994 || (input->flags & DYNAMIC) == 0
8995 || elf_dynversym (input) == 0)
8998 hdr = &elf_tdata (input)->dynsymtab_hdr;
9000 symcount = hdr->sh_size / bed->s->sizeof_sym;
9001 if (elf_bad_symtab (input))
9003 extsymcount = symcount;
9008 extsymcount = symcount - hdr->sh_info;
9009 extsymoff = hdr->sh_info;
9012 if (extsymcount == 0)
9015 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
9017 if (isymbuf == NULL)
9020 /* Read in any version definitions. */
9021 versymhdr = &elf_tdata (input)->dynversym_hdr;
9022 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
9023 if (extversym == NULL)
9026 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
9027 || (bfd_bread (extversym, versymhdr->sh_size, input)
9028 != versymhdr->sh_size))
9036 ever = extversym + extsymoff;
9037 isymend = isymbuf + extsymcount;
9038 for (isym = isymbuf; isym < isymend; isym++, ever++)
9041 Elf_Internal_Versym iver;
9042 unsigned short version_index;
9044 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
9045 || isym->st_shndx == SHN_UNDEF)
9048 name = bfd_elf_string_from_elf_section (input,
9051 if (strcmp (name, h->root.root.string) != 0)
9054 _bfd_elf_swap_versym_in (input, ever, &iver);
9056 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
9058 && h->forced_local))
9060 /* If we have a non-hidden versioned sym, then it should
9061 have provided a definition for the undefined sym unless
9062 it is defined in a non-shared object and forced local.
9067 version_index = iver.vs_vers & VERSYM_VERSION;
9068 if (version_index == 1 || version_index == 2)
9070 /* This is the base or first version. We can use it. */
9084 /* Convert ELF common symbol TYPE. */
9087 elf_link_convert_common_type (struct bfd_link_info *info, int type)
9089 /* Commom symbol can only appear in relocatable link. */
9090 if (!bfd_link_relocatable (info))
9092 switch (info->elf_stt_common)
9096 case elf_stt_common:
9099 case no_elf_stt_common:
9106 /* Add an external symbol to the symbol table. This is called from
9107 the hash table traversal routine. When generating a shared object,
9108 we go through the symbol table twice. The first time we output
9109 anything that might have been forced to local scope in a version
9110 script. The second time we output the symbols that are still
9114 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
9116 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
9117 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
9118 struct elf_final_link_info *flinfo = eoinfo->flinfo;
9120 Elf_Internal_Sym sym;
9121 asection *input_sec;
9122 const struct elf_backend_data *bed;
9126 /* A symbol is bound locally if it is forced local or it is locally
9127 defined, hidden versioned, not referenced by shared library and
9128 not exported when linking executable. */
9129 bfd_boolean local_bind = (h->forced_local
9130 || (bfd_link_executable (flinfo->info)
9131 && !flinfo->info->export_dynamic
9135 && h->versioned == versioned_hidden));
9137 if (h->root.type == bfd_link_hash_warning)
9139 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9140 if (h->root.type == bfd_link_hash_new)
9144 /* Decide whether to output this symbol in this pass. */
9145 if (eoinfo->localsyms)
9156 bed = get_elf_backend_data (flinfo->output_bfd);
9158 if (h->root.type == bfd_link_hash_undefined)
9160 /* If we have an undefined symbol reference here then it must have
9161 come from a shared library that is being linked in. (Undefined
9162 references in regular files have already been handled unless
9163 they are in unreferenced sections which are removed by garbage
9165 bfd_boolean ignore_undef = FALSE;
9167 /* Some symbols may be special in that the fact that they're
9168 undefined can be safely ignored - let backend determine that. */
9169 if (bed->elf_backend_ignore_undef_symbol)
9170 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
9172 /* If we are reporting errors for this situation then do so now. */
9175 && (!h->ref_regular || flinfo->info->gc_sections)
9176 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
9177 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
9179 if (!(flinfo->info->callbacks->undefined_symbol
9180 (flinfo->info, h->root.root.string,
9181 h->ref_regular ? NULL : h->root.u.undef.abfd,
9183 (flinfo->info->unresolved_syms_in_shared_libs
9184 == RM_GENERATE_ERROR))))
9186 bfd_set_error (bfd_error_bad_value);
9187 eoinfo->failed = TRUE;
9193 /* We should also warn if a forced local symbol is referenced from
9194 shared libraries. */
9195 if (bfd_link_executable (flinfo->info)
9200 && h->ref_dynamic_nonweak
9201 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
9205 struct elf_link_hash_entry *hi = h;
9207 /* Check indirect symbol. */
9208 while (hi->root.type == bfd_link_hash_indirect)
9209 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
9211 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
9212 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
9213 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
9214 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
9216 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
9217 def_bfd = flinfo->output_bfd;
9218 if (hi->root.u.def.section != bfd_abs_section_ptr)
9219 def_bfd = hi->root.u.def.section->owner;
9220 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
9221 h->root.root.string);
9222 bfd_set_error (bfd_error_bad_value);
9223 eoinfo->failed = TRUE;
9227 /* We don't want to output symbols that have never been mentioned by
9228 a regular file, or that we have been told to strip. However, if
9229 h->indx is set to -2, the symbol is used by a reloc and we must
9234 else if ((h->def_dynamic
9236 || h->root.type == bfd_link_hash_new)
9240 else if (flinfo->info->strip == strip_all)
9242 else if (flinfo->info->strip == strip_some
9243 && bfd_hash_lookup (flinfo->info->keep_hash,
9244 h->root.root.string, FALSE, FALSE) == NULL)
9246 else if ((h->root.type == bfd_link_hash_defined
9247 || h->root.type == bfd_link_hash_defweak)
9248 && ((flinfo->info->strip_discarded
9249 && discarded_section (h->root.u.def.section))
9250 || ((h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0
9251 && h->root.u.def.section->owner != NULL
9252 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
9254 else if ((h->root.type == bfd_link_hash_undefined
9255 || h->root.type == bfd_link_hash_undefweak)
9256 && h->root.u.undef.abfd != NULL
9257 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
9262 /* If we're stripping it, and it's not a dynamic symbol, there's
9263 nothing else to do. However, if it is a forced local symbol or
9264 an ifunc symbol we need to give the backend finish_dynamic_symbol
9265 function a chance to make it dynamic. */
9268 && type != STT_GNU_IFUNC
9269 && !h->forced_local)
9273 sym.st_size = h->size;
9274 sym.st_other = h->other;
9275 switch (h->root.type)
9278 case bfd_link_hash_new:
9279 case bfd_link_hash_warning:
9283 case bfd_link_hash_undefined:
9284 case bfd_link_hash_undefweak:
9285 input_sec = bfd_und_section_ptr;
9286 sym.st_shndx = SHN_UNDEF;
9289 case bfd_link_hash_defined:
9290 case bfd_link_hash_defweak:
9292 input_sec = h->root.u.def.section;
9293 if (input_sec->output_section != NULL)
9296 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
9297 input_sec->output_section);
9298 if (sym.st_shndx == SHN_BAD)
9300 (*_bfd_error_handler)
9301 (_("%B: could not find output section %A for input section %A"),
9302 flinfo->output_bfd, input_sec->output_section, input_sec);
9303 bfd_set_error (bfd_error_nonrepresentable_section);
9304 eoinfo->failed = TRUE;
9308 /* ELF symbols in relocatable files are section relative,
9309 but in nonrelocatable files they are virtual
9311 sym.st_value = h->root.u.def.value + input_sec->output_offset;
9312 if (!bfd_link_relocatable (flinfo->info))
9314 sym.st_value += input_sec->output_section->vma;
9315 if (h->type == STT_TLS)
9317 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
9318 if (tls_sec != NULL)
9319 sym.st_value -= tls_sec->vma;
9325 BFD_ASSERT (input_sec->owner == NULL
9326 || (input_sec->owner->flags & DYNAMIC) != 0);
9327 sym.st_shndx = SHN_UNDEF;
9328 input_sec = bfd_und_section_ptr;
9333 case bfd_link_hash_common:
9334 input_sec = h->root.u.c.p->section;
9335 sym.st_shndx = bed->common_section_index (input_sec);
9336 sym.st_value = 1 << h->root.u.c.p->alignment_power;
9339 case bfd_link_hash_indirect:
9340 /* These symbols are created by symbol versioning. They point
9341 to the decorated version of the name. For example, if the
9342 symbol foo@@GNU_1.2 is the default, which should be used when
9343 foo is used with no version, then we add an indirect symbol
9344 foo which points to foo@@GNU_1.2. We ignore these symbols,
9345 since the indirected symbol is already in the hash table. */
9349 if (type == STT_COMMON || type == STT_OBJECT)
9350 switch (h->root.type)
9352 case bfd_link_hash_common:
9353 type = elf_link_convert_common_type (flinfo->info, type);
9355 case bfd_link_hash_defined:
9356 case bfd_link_hash_defweak:
9357 if (bed->common_definition (&sym))
9358 type = elf_link_convert_common_type (flinfo->info, type);
9362 case bfd_link_hash_undefined:
9363 case bfd_link_hash_undefweak:
9371 sym.st_info = ELF_ST_INFO (STB_LOCAL, type);
9372 /* Turn off visibility on local symbol. */
9373 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
9375 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
9376 else if (h->unique_global && h->def_regular)
9377 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, type);
9378 else if (h->root.type == bfd_link_hash_undefweak
9379 || h->root.type == bfd_link_hash_defweak)
9380 sym.st_info = ELF_ST_INFO (STB_WEAK, type);
9382 sym.st_info = ELF_ST_INFO (STB_GLOBAL, type);
9383 sym.st_target_internal = h->target_internal;
9385 /* Give the processor backend a chance to tweak the symbol value,
9386 and also to finish up anything that needs to be done for this
9387 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
9388 forced local syms when non-shared is due to a historical quirk.
9389 STT_GNU_IFUNC symbol must go through PLT. */
9390 if ((h->type == STT_GNU_IFUNC
9392 && !bfd_link_relocatable (flinfo->info))
9393 || ((h->dynindx != -1
9395 && ((bfd_link_pic (flinfo->info)
9396 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
9397 || h->root.type != bfd_link_hash_undefweak))
9398 || !h->forced_local)
9399 && elf_hash_table (flinfo->info)->dynamic_sections_created))
9401 if (! ((*bed->elf_backend_finish_dynamic_symbol)
9402 (flinfo->output_bfd, flinfo->info, h, &sym)))
9404 eoinfo->failed = TRUE;
9409 /* If we are marking the symbol as undefined, and there are no
9410 non-weak references to this symbol from a regular object, then
9411 mark the symbol as weak undefined; if there are non-weak
9412 references, mark the symbol as strong. We can't do this earlier,
9413 because it might not be marked as undefined until the
9414 finish_dynamic_symbol routine gets through with it. */
9415 if (sym.st_shndx == SHN_UNDEF
9417 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
9418 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
9421 type = ELF_ST_TYPE (sym.st_info);
9423 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
9424 if (type == STT_GNU_IFUNC)
9427 if (h->ref_regular_nonweak)
9428 bindtype = STB_GLOBAL;
9430 bindtype = STB_WEAK;
9431 sym.st_info = ELF_ST_INFO (bindtype, type);
9434 /* If this is a symbol defined in a dynamic library, don't use the
9435 symbol size from the dynamic library. Relinking an executable
9436 against a new library may introduce gratuitous changes in the
9437 executable's symbols if we keep the size. */
9438 if (sym.st_shndx == SHN_UNDEF
9443 /* If a non-weak symbol with non-default visibility is not defined
9444 locally, it is a fatal error. */
9445 if (!bfd_link_relocatable (flinfo->info)
9446 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
9447 && ELF_ST_BIND (sym.st_info) != STB_WEAK
9448 && h->root.type == bfd_link_hash_undefined
9453 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
9454 msg = _("%B: protected symbol `%s' isn't defined");
9455 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
9456 msg = _("%B: internal symbol `%s' isn't defined");
9458 msg = _("%B: hidden symbol `%s' isn't defined");
9459 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
9460 bfd_set_error (bfd_error_bad_value);
9461 eoinfo->failed = TRUE;
9465 /* If this symbol should be put in the .dynsym section, then put it
9466 there now. We already know the symbol index. We also fill in
9467 the entry in the .hash section. */
9468 if (elf_hash_table (flinfo->info)->dynsym != NULL
9470 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9474 /* Since there is no version information in the dynamic string,
9475 if there is no version info in symbol version section, we will
9476 have a run-time problem if not linking executable, referenced
9477 by shared library, not locally defined, or not bound locally.
9479 if (h->verinfo.verdef == NULL
9481 && (!bfd_link_executable (flinfo->info)
9483 || !h->def_regular))
9485 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9487 if (p && p [1] != '\0')
9489 (*_bfd_error_handler)
9490 (_("%B: No symbol version section for versioned symbol `%s'"),
9491 flinfo->output_bfd, h->root.root.string);
9492 eoinfo->failed = TRUE;
9497 sym.st_name = h->dynstr_index;
9498 esym = (elf_hash_table (flinfo->info)->dynsym->contents
9499 + h->dynindx * bed->s->sizeof_sym);
9500 if (!check_dynsym (flinfo->output_bfd, &sym))
9502 eoinfo->failed = TRUE;
9505 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9507 if (flinfo->hash_sec != NULL)
9509 size_t hash_entry_size;
9510 bfd_byte *bucketpos;
9515 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9516 bucket = h->u.elf_hash_value % bucketcount;
9519 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9520 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9521 + (bucket + 2) * hash_entry_size);
9522 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9523 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9525 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9526 ((bfd_byte *) flinfo->hash_sec->contents
9527 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9530 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9532 Elf_Internal_Versym iversym;
9533 Elf_External_Versym *eversym;
9535 if (!h->def_regular)
9537 if (h->verinfo.verdef == NULL
9538 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
9539 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
9540 iversym.vs_vers = 0;
9542 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9546 if (h->verinfo.vertree == NULL)
9547 iversym.vs_vers = 1;
9549 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9550 if (flinfo->info->create_default_symver)
9554 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
9556 if (h->versioned == versioned_hidden && h->def_regular)
9557 iversym.vs_vers |= VERSYM_HIDDEN;
9559 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9560 eversym += h->dynindx;
9561 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9565 /* If the symbol is undefined, and we didn't output it to .dynsym,
9566 strip it from .symtab too. Obviously we can't do this for
9567 relocatable output or when needed for --emit-relocs. */
9568 else if (input_sec == bfd_und_section_ptr
9570 && !bfd_link_relocatable (flinfo->info))
9572 /* Also strip others that we couldn't earlier due to dynamic symbol
9576 if ((input_sec->flags & SEC_EXCLUDE) != 0)
9579 /* Output a FILE symbol so that following locals are not associated
9580 with the wrong input file. We need one for forced local symbols
9581 if we've seen more than one FILE symbol or when we have exactly
9582 one FILE symbol but global symbols are present in a file other
9583 than the one with the FILE symbol. We also need one if linker
9584 defined symbols are present. In practice these conditions are
9585 always met, so just emit the FILE symbol unconditionally. */
9586 if (eoinfo->localsyms
9587 && !eoinfo->file_sym_done
9588 && eoinfo->flinfo->filesym_count != 0)
9590 Elf_Internal_Sym fsym;
9592 memset (&fsym, 0, sizeof (fsym));
9593 fsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9594 fsym.st_shndx = SHN_ABS;
9595 if (!elf_link_output_symstrtab (eoinfo->flinfo, NULL, &fsym,
9596 bfd_und_section_ptr, NULL))
9599 eoinfo->file_sym_done = TRUE;
9602 indx = bfd_get_symcount (flinfo->output_bfd);
9603 ret = elf_link_output_symstrtab (flinfo, h->root.root.string, &sym,
9607 eoinfo->failed = TRUE;
9612 else if (h->indx == -2)
9618 /* Return TRUE if special handling is done for relocs in SEC against
9619 symbols defined in discarded sections. */
9622 elf_section_ignore_discarded_relocs (asection *sec)
9624 const struct elf_backend_data *bed;
9626 switch (sec->sec_info_type)
9628 case SEC_INFO_TYPE_STABS:
9629 case SEC_INFO_TYPE_EH_FRAME:
9630 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
9636 bed = get_elf_backend_data (sec->owner);
9637 if (bed->elf_backend_ignore_discarded_relocs != NULL
9638 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9644 /* Return a mask saying how ld should treat relocations in SEC against
9645 symbols defined in discarded sections. If this function returns
9646 COMPLAIN set, ld will issue a warning message. If this function
9647 returns PRETEND set, and the discarded section was link-once and the
9648 same size as the kept link-once section, ld will pretend that the
9649 symbol was actually defined in the kept section. Otherwise ld will
9650 zero the reloc (at least that is the intent, but some cooperation by
9651 the target dependent code is needed, particularly for REL targets). */
9654 _bfd_elf_default_action_discarded (asection *sec)
9656 if (sec->flags & SEC_DEBUGGING)
9659 if (strcmp (".eh_frame", sec->name) == 0)
9662 if (strcmp (".gcc_except_table", sec->name) == 0)
9665 return COMPLAIN | PRETEND;
9668 /* Find a match between a section and a member of a section group. */
9671 match_group_member (asection *sec, asection *group,
9672 struct bfd_link_info *info)
9674 asection *first = elf_next_in_group (group);
9675 asection *s = first;
9679 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9682 s = elf_next_in_group (s);
9690 /* Check if the kept section of a discarded section SEC can be used
9691 to replace it. Return the replacement if it is OK. Otherwise return
9695 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9699 kept = sec->kept_section;
9702 if ((kept->flags & SEC_GROUP) != 0)
9703 kept = match_group_member (sec, kept, info);
9705 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9706 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9708 sec->kept_section = kept;
9713 /* Link an input file into the linker output file. This function
9714 handles all the sections and relocations of the input file at once.
9715 This is so that we only have to read the local symbols once, and
9716 don't have to keep them in memory. */
9719 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9721 int (*relocate_section)
9722 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9723 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9725 Elf_Internal_Shdr *symtab_hdr;
9728 Elf_Internal_Sym *isymbuf;
9729 Elf_Internal_Sym *isym;
9730 Elf_Internal_Sym *isymend;
9732 asection **ppsection;
9734 const struct elf_backend_data *bed;
9735 struct elf_link_hash_entry **sym_hashes;
9736 bfd_size_type address_size;
9737 bfd_vma r_type_mask;
9739 bfd_boolean have_file_sym = FALSE;
9741 output_bfd = flinfo->output_bfd;
9742 bed = get_elf_backend_data (output_bfd);
9743 relocate_section = bed->elf_backend_relocate_section;
9745 /* If this is a dynamic object, we don't want to do anything here:
9746 we don't want the local symbols, and we don't want the section
9748 if ((input_bfd->flags & DYNAMIC) != 0)
9751 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9752 if (elf_bad_symtab (input_bfd))
9754 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9759 locsymcount = symtab_hdr->sh_info;
9760 extsymoff = symtab_hdr->sh_info;
9763 /* Read the local symbols. */
9764 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9765 if (isymbuf == NULL && locsymcount != 0)
9767 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9768 flinfo->internal_syms,
9769 flinfo->external_syms,
9770 flinfo->locsym_shndx);
9771 if (isymbuf == NULL)
9775 /* Find local symbol sections and adjust values of symbols in
9776 SEC_MERGE sections. Write out those local symbols we know are
9777 going into the output file. */
9778 isymend = isymbuf + locsymcount;
9779 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9781 isym++, pindex++, ppsection++)
9785 Elf_Internal_Sym osym;
9791 if (elf_bad_symtab (input_bfd))
9793 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9800 if (isym->st_shndx == SHN_UNDEF)
9801 isec = bfd_und_section_ptr;
9802 else if (isym->st_shndx == SHN_ABS)
9803 isec = bfd_abs_section_ptr;
9804 else if (isym->st_shndx == SHN_COMMON)
9805 isec = bfd_com_section_ptr;
9808 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9811 /* Don't attempt to output symbols with st_shnx in the
9812 reserved range other than SHN_ABS and SHN_COMMON. */
9816 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9817 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9819 _bfd_merged_section_offset (output_bfd, &isec,
9820 elf_section_data (isec)->sec_info,
9826 /* Don't output the first, undefined, symbol. In fact, don't
9827 output any undefined local symbol. */
9828 if (isec == bfd_und_section_ptr)
9831 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9833 /* We never output section symbols. Instead, we use the
9834 section symbol of the corresponding section in the output
9839 /* If we are stripping all symbols, we don't want to output this
9841 if (flinfo->info->strip == strip_all)
9844 /* If we are discarding all local symbols, we don't want to
9845 output this one. If we are generating a relocatable output
9846 file, then some of the local symbols may be required by
9847 relocs; we output them below as we discover that they are
9849 if (flinfo->info->discard == discard_all)
9852 /* If this symbol is defined in a section which we are
9853 discarding, we don't need to keep it. */
9854 if (isym->st_shndx != SHN_UNDEF
9855 && isym->st_shndx < SHN_LORESERVE
9856 && bfd_section_removed_from_list (output_bfd,
9857 isec->output_section))
9860 /* Get the name of the symbol. */
9861 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9866 /* See if we are discarding symbols with this name. */
9867 if ((flinfo->info->strip == strip_some
9868 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9870 || (((flinfo->info->discard == discard_sec_merge
9871 && (isec->flags & SEC_MERGE)
9872 && !bfd_link_relocatable (flinfo->info))
9873 || flinfo->info->discard == discard_l)
9874 && bfd_is_local_label_name (input_bfd, name)))
9877 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9879 if (input_bfd->lto_output)
9880 /* -flto puts a temp file name here. This means builds
9881 are not reproducible. Discard the symbol. */
9883 have_file_sym = TRUE;
9884 flinfo->filesym_count += 1;
9888 /* In the absence of debug info, bfd_find_nearest_line uses
9889 FILE symbols to determine the source file for local
9890 function symbols. Provide a FILE symbol here if input
9891 files lack such, so that their symbols won't be
9892 associated with a previous input file. It's not the
9893 source file, but the best we can do. */
9894 have_file_sym = TRUE;
9895 flinfo->filesym_count += 1;
9896 memset (&osym, 0, sizeof (osym));
9897 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9898 osym.st_shndx = SHN_ABS;
9899 if (!elf_link_output_symstrtab (flinfo,
9900 (input_bfd->lto_output ? NULL
9901 : input_bfd->filename),
9902 &osym, bfd_abs_section_ptr,
9909 /* Adjust the section index for the output file. */
9910 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9911 isec->output_section);
9912 if (osym.st_shndx == SHN_BAD)
9915 /* ELF symbols in relocatable files are section relative, but
9916 in executable files they are virtual addresses. Note that
9917 this code assumes that all ELF sections have an associated
9918 BFD section with a reasonable value for output_offset; below
9919 we assume that they also have a reasonable value for
9920 output_section. Any special sections must be set up to meet
9921 these requirements. */
9922 osym.st_value += isec->output_offset;
9923 if (!bfd_link_relocatable (flinfo->info))
9925 osym.st_value += isec->output_section->vma;
9926 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9928 /* STT_TLS symbols are relative to PT_TLS segment base. */
9929 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9930 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9934 indx = bfd_get_symcount (output_bfd);
9935 ret = elf_link_output_symstrtab (flinfo, name, &osym, isec, NULL);
9942 if (bed->s->arch_size == 32)
9950 r_type_mask = 0xffffffff;
9955 /* Relocate the contents of each section. */
9956 sym_hashes = elf_sym_hashes (input_bfd);
9957 for (o = input_bfd->sections; o != NULL; o = o->next)
9961 if (! o->linker_mark)
9963 /* This section was omitted from the link. */
9967 if (bfd_link_relocatable (flinfo->info)
9968 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9970 /* Deal with the group signature symbol. */
9971 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9972 unsigned long symndx = sec_data->this_hdr.sh_info;
9973 asection *osec = o->output_section;
9975 if (symndx >= locsymcount
9976 || (elf_bad_symtab (input_bfd)
9977 && flinfo->sections[symndx] == NULL))
9979 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9980 while (h->root.type == bfd_link_hash_indirect
9981 || h->root.type == bfd_link_hash_warning)
9982 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9983 /* Arrange for symbol to be output. */
9985 elf_section_data (osec)->this_hdr.sh_info = -2;
9987 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9989 /* We'll use the output section target_index. */
9990 asection *sec = flinfo->sections[symndx]->output_section;
9991 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9995 if (flinfo->indices[symndx] == -1)
9997 /* Otherwise output the local symbol now. */
9998 Elf_Internal_Sym sym = isymbuf[symndx];
9999 asection *sec = flinfo->sections[symndx]->output_section;
10004 name = bfd_elf_string_from_elf_section (input_bfd,
10005 symtab_hdr->sh_link,
10010 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
10012 if (sym.st_shndx == SHN_BAD)
10015 sym.st_value += o->output_offset;
10017 indx = bfd_get_symcount (output_bfd);
10018 ret = elf_link_output_symstrtab (flinfo, name, &sym, o,
10023 flinfo->indices[symndx] = indx;
10027 elf_section_data (osec)->this_hdr.sh_info
10028 = flinfo->indices[symndx];
10032 if ((o->flags & SEC_HAS_CONTENTS) == 0
10033 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
10036 if ((o->flags & SEC_LINKER_CREATED) != 0)
10038 /* Section was created by _bfd_elf_link_create_dynamic_sections
10043 /* Get the contents of the section. They have been cached by a
10044 relaxation routine. Note that o is a section in an input
10045 file, so the contents field will not have been set by any of
10046 the routines which work on output files. */
10047 if (elf_section_data (o)->this_hdr.contents != NULL)
10049 contents = elf_section_data (o)->this_hdr.contents;
10050 if (bed->caches_rawsize
10052 && o->rawsize < o->size)
10054 memcpy (flinfo->contents, contents, o->rawsize);
10055 contents = flinfo->contents;
10060 contents = flinfo->contents;
10061 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
10065 if ((o->flags & SEC_RELOC) != 0)
10067 Elf_Internal_Rela *internal_relocs;
10068 Elf_Internal_Rela *rel, *relend;
10069 int action_discarded;
10072 /* Get the swapped relocs. */
10074 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
10075 flinfo->internal_relocs, FALSE);
10076 if (internal_relocs == NULL
10077 && o->reloc_count > 0)
10080 /* We need to reverse-copy input .ctors/.dtors sections if
10081 they are placed in .init_array/.finit_array for output. */
10082 if (o->size > address_size
10083 && ((strncmp (o->name, ".ctors", 6) == 0
10084 && strcmp (o->output_section->name,
10085 ".init_array") == 0)
10086 || (strncmp (o->name, ".dtors", 6) == 0
10087 && strcmp (o->output_section->name,
10088 ".fini_array") == 0))
10089 && (o->name[6] == 0 || o->name[6] == '.'))
10091 if (o->size != o->reloc_count * address_size)
10093 (*_bfd_error_handler)
10094 (_("error: %B: size of section %A is not "
10095 "multiple of address size"),
10097 bfd_set_error (bfd_error_on_input);
10100 o->flags |= SEC_ELF_REVERSE_COPY;
10103 action_discarded = -1;
10104 if (!elf_section_ignore_discarded_relocs (o))
10105 action_discarded = (*bed->action_discarded) (o);
10107 /* Run through the relocs evaluating complex reloc symbols and
10108 looking for relocs against symbols from discarded sections
10109 or section symbols from removed link-once sections.
10110 Complain about relocs against discarded sections. Zero
10111 relocs against removed link-once sections. */
10113 rel = internal_relocs;
10114 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
10115 for ( ; rel < relend; rel++)
10117 unsigned long r_symndx = rel->r_info >> r_sym_shift;
10118 unsigned int s_type;
10119 asection **ps, *sec;
10120 struct elf_link_hash_entry *h = NULL;
10121 const char *sym_name;
10123 if (r_symndx == STN_UNDEF)
10126 if (r_symndx >= locsymcount
10127 || (elf_bad_symtab (input_bfd)
10128 && flinfo->sections[r_symndx] == NULL))
10130 h = sym_hashes[r_symndx - extsymoff];
10132 /* Badly formatted input files can contain relocs that
10133 reference non-existant symbols. Check here so that
10134 we do not seg fault. */
10139 sprintf_vma (buffer, rel->r_info);
10140 (*_bfd_error_handler)
10141 (_("error: %B contains a reloc (0x%s) for section %A "
10142 "that references a non-existent global symbol"),
10143 input_bfd, o, buffer);
10144 bfd_set_error (bfd_error_bad_value);
10148 while (h->root.type == bfd_link_hash_indirect
10149 || h->root.type == bfd_link_hash_warning)
10150 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10154 /* If a plugin symbol is referenced from a non-IR file,
10155 mark the symbol as undefined. Note that the
10156 linker may attach linker created dynamic sections
10157 to the plugin bfd. Symbols defined in linker
10158 created sections are not plugin symbols. */
10159 if (h->root.non_ir_ref
10160 && (h->root.type == bfd_link_hash_defined
10161 || h->root.type == bfd_link_hash_defweak)
10162 && (h->root.u.def.section->flags
10163 & SEC_LINKER_CREATED) == 0
10164 && h->root.u.def.section->owner != NULL
10165 && (h->root.u.def.section->owner->flags
10166 & BFD_PLUGIN) != 0)
10168 h->root.type = bfd_link_hash_undefined;
10169 h->root.u.undef.abfd = h->root.u.def.section->owner;
10173 if (h->root.type == bfd_link_hash_defined
10174 || h->root.type == bfd_link_hash_defweak)
10175 ps = &h->root.u.def.section;
10177 sym_name = h->root.root.string;
10181 Elf_Internal_Sym *sym = isymbuf + r_symndx;
10183 s_type = ELF_ST_TYPE (sym->st_info);
10184 ps = &flinfo->sections[r_symndx];
10185 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
10189 if ((s_type == STT_RELC || s_type == STT_SRELC)
10190 && !bfd_link_relocatable (flinfo->info))
10193 bfd_vma dot = (rel->r_offset
10194 + o->output_offset + o->output_section->vma);
10196 printf ("Encountered a complex symbol!");
10197 printf (" (input_bfd %s, section %s, reloc %ld\n",
10198 input_bfd->filename, o->name,
10199 (long) (rel - internal_relocs));
10200 printf (" symbol: idx %8.8lx, name %s\n",
10201 r_symndx, sym_name);
10202 printf (" reloc : info %8.8lx, addr %8.8lx\n",
10203 (unsigned long) rel->r_info,
10204 (unsigned long) rel->r_offset);
10206 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
10207 isymbuf, locsymcount, s_type == STT_SRELC))
10210 /* Symbol evaluated OK. Update to absolute value. */
10211 set_symbol_value (input_bfd, isymbuf, locsymcount,
10216 if (action_discarded != -1 && ps != NULL)
10218 /* Complain if the definition comes from a
10219 discarded section. */
10220 if ((sec = *ps) != NULL && discarded_section (sec))
10222 BFD_ASSERT (r_symndx != STN_UNDEF);
10223 if (action_discarded & COMPLAIN)
10224 (*flinfo->info->callbacks->einfo)
10225 (_("%X`%s' referenced in section `%A' of %B: "
10226 "defined in discarded section `%A' of %B\n"),
10227 sym_name, o, input_bfd, sec, sec->owner);
10229 /* Try to do the best we can to support buggy old
10230 versions of gcc. Pretend that the symbol is
10231 really defined in the kept linkonce section.
10232 FIXME: This is quite broken. Modifying the
10233 symbol here means we will be changing all later
10234 uses of the symbol, not just in this section. */
10235 if (action_discarded & PRETEND)
10239 kept = _bfd_elf_check_kept_section (sec,
10251 /* Relocate the section by invoking a back end routine.
10253 The back end routine is responsible for adjusting the
10254 section contents as necessary, and (if using Rela relocs
10255 and generating a relocatable output file) adjusting the
10256 reloc addend as necessary.
10258 The back end routine does not have to worry about setting
10259 the reloc address or the reloc symbol index.
10261 The back end routine is given a pointer to the swapped in
10262 internal symbols, and can access the hash table entries
10263 for the external symbols via elf_sym_hashes (input_bfd).
10265 When generating relocatable output, the back end routine
10266 must handle STB_LOCAL/STT_SECTION symbols specially. The
10267 output symbol is going to be a section symbol
10268 corresponding to the output section, which will require
10269 the addend to be adjusted. */
10271 ret = (*relocate_section) (output_bfd, flinfo->info,
10272 input_bfd, o, contents,
10280 || bfd_link_relocatable (flinfo->info)
10281 || flinfo->info->emitrelocations)
10283 Elf_Internal_Rela *irela;
10284 Elf_Internal_Rela *irelaend, *irelamid;
10285 bfd_vma last_offset;
10286 struct elf_link_hash_entry **rel_hash;
10287 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
10288 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
10289 unsigned int next_erel;
10290 bfd_boolean rela_normal;
10291 struct bfd_elf_section_data *esdi, *esdo;
10293 esdi = elf_section_data (o);
10294 esdo = elf_section_data (o->output_section);
10295 rela_normal = FALSE;
10297 /* Adjust the reloc addresses and symbol indices. */
10299 irela = internal_relocs;
10300 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
10301 rel_hash = esdo->rel.hashes + esdo->rel.count;
10302 /* We start processing the REL relocs, if any. When we reach
10303 IRELAMID in the loop, we switch to the RELA relocs. */
10305 if (esdi->rel.hdr != NULL)
10306 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
10307 * bed->s->int_rels_per_ext_rel);
10308 rel_hash_list = rel_hash;
10309 rela_hash_list = NULL;
10310 last_offset = o->output_offset;
10311 if (!bfd_link_relocatable (flinfo->info))
10312 last_offset += o->output_section->vma;
10313 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
10315 unsigned long r_symndx;
10317 Elf_Internal_Sym sym;
10319 if (next_erel == bed->s->int_rels_per_ext_rel)
10325 if (irela == irelamid)
10327 rel_hash = esdo->rela.hashes + esdo->rela.count;
10328 rela_hash_list = rel_hash;
10329 rela_normal = bed->rela_normal;
10332 irela->r_offset = _bfd_elf_section_offset (output_bfd,
10335 if (irela->r_offset >= (bfd_vma) -2)
10337 /* This is a reloc for a deleted entry or somesuch.
10338 Turn it into an R_*_NONE reloc, at the same
10339 offset as the last reloc. elf_eh_frame.c and
10340 bfd_elf_discard_info rely on reloc offsets
10342 irela->r_offset = last_offset;
10344 irela->r_addend = 0;
10348 irela->r_offset += o->output_offset;
10350 /* Relocs in an executable have to be virtual addresses. */
10351 if (!bfd_link_relocatable (flinfo->info))
10352 irela->r_offset += o->output_section->vma;
10354 last_offset = irela->r_offset;
10356 r_symndx = irela->r_info >> r_sym_shift;
10357 if (r_symndx == STN_UNDEF)
10360 if (r_symndx >= locsymcount
10361 || (elf_bad_symtab (input_bfd)
10362 && flinfo->sections[r_symndx] == NULL))
10364 struct elf_link_hash_entry *rh;
10365 unsigned long indx;
10367 /* This is a reloc against a global symbol. We
10368 have not yet output all the local symbols, so
10369 we do not know the symbol index of any global
10370 symbol. We set the rel_hash entry for this
10371 reloc to point to the global hash table entry
10372 for this symbol. The symbol index is then
10373 set at the end of bfd_elf_final_link. */
10374 indx = r_symndx - extsymoff;
10375 rh = elf_sym_hashes (input_bfd)[indx];
10376 while (rh->root.type == bfd_link_hash_indirect
10377 || rh->root.type == bfd_link_hash_warning)
10378 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
10380 /* Setting the index to -2 tells
10381 elf_link_output_extsym that this symbol is
10382 used by a reloc. */
10383 BFD_ASSERT (rh->indx < 0);
10391 /* This is a reloc against a local symbol. */
10394 sym = isymbuf[r_symndx];
10395 sec = flinfo->sections[r_symndx];
10396 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
10398 /* I suppose the backend ought to fill in the
10399 section of any STT_SECTION symbol against a
10400 processor specific section. */
10401 r_symndx = STN_UNDEF;
10402 if (bfd_is_abs_section (sec))
10404 else if (sec == NULL || sec->owner == NULL)
10406 bfd_set_error (bfd_error_bad_value);
10411 asection *osec = sec->output_section;
10413 /* If we have discarded a section, the output
10414 section will be the absolute section. In
10415 case of discarded SEC_MERGE sections, use
10416 the kept section. relocate_section should
10417 have already handled discarded linkonce
10419 if (bfd_is_abs_section (osec)
10420 && sec->kept_section != NULL
10421 && sec->kept_section->output_section != NULL)
10423 osec = sec->kept_section->output_section;
10424 irela->r_addend -= osec->vma;
10427 if (!bfd_is_abs_section (osec))
10429 r_symndx = osec->target_index;
10430 if (r_symndx == STN_UNDEF)
10432 irela->r_addend += osec->vma;
10433 osec = _bfd_nearby_section (output_bfd, osec,
10435 irela->r_addend -= osec->vma;
10436 r_symndx = osec->target_index;
10441 /* Adjust the addend according to where the
10442 section winds up in the output section. */
10444 irela->r_addend += sec->output_offset;
10448 if (flinfo->indices[r_symndx] == -1)
10450 unsigned long shlink;
10455 if (flinfo->info->strip == strip_all)
10457 /* You can't do ld -r -s. */
10458 bfd_set_error (bfd_error_invalid_operation);
10462 /* This symbol was skipped earlier, but
10463 since it is needed by a reloc, we
10464 must output it now. */
10465 shlink = symtab_hdr->sh_link;
10466 name = (bfd_elf_string_from_elf_section
10467 (input_bfd, shlink, sym.st_name));
10471 osec = sec->output_section;
10473 _bfd_elf_section_from_bfd_section (output_bfd,
10475 if (sym.st_shndx == SHN_BAD)
10478 sym.st_value += sec->output_offset;
10479 if (!bfd_link_relocatable (flinfo->info))
10481 sym.st_value += osec->vma;
10482 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
10484 /* STT_TLS symbols are relative to PT_TLS
10486 BFD_ASSERT (elf_hash_table (flinfo->info)
10487 ->tls_sec != NULL);
10488 sym.st_value -= (elf_hash_table (flinfo->info)
10493 indx = bfd_get_symcount (output_bfd);
10494 ret = elf_link_output_symstrtab (flinfo, name,
10500 flinfo->indices[r_symndx] = indx;
10505 r_symndx = flinfo->indices[r_symndx];
10508 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
10509 | (irela->r_info & r_type_mask));
10512 /* Swap out the relocs. */
10513 input_rel_hdr = esdi->rel.hdr;
10514 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
10516 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10521 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
10522 * bed->s->int_rels_per_ext_rel);
10523 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
10526 input_rela_hdr = esdi->rela.hdr;
10527 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
10529 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10538 /* Write out the modified section contents. */
10539 if (bed->elf_backend_write_section
10540 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
10543 /* Section written out. */
10545 else switch (o->sec_info_type)
10547 case SEC_INFO_TYPE_STABS:
10548 if (! (_bfd_write_section_stabs
10550 &elf_hash_table (flinfo->info)->stab_info,
10551 o, &elf_section_data (o)->sec_info, contents)))
10554 case SEC_INFO_TYPE_MERGE:
10555 if (! _bfd_write_merged_section (output_bfd, o,
10556 elf_section_data (o)->sec_info))
10559 case SEC_INFO_TYPE_EH_FRAME:
10561 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10566 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
10568 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd,
10576 if (! (o->flags & SEC_EXCLUDE))
10578 file_ptr offset = (file_ptr) o->output_offset;
10579 bfd_size_type todo = o->size;
10581 offset *= bfd_octets_per_byte (output_bfd);
10583 if ((o->flags & SEC_ELF_REVERSE_COPY))
10585 /* Reverse-copy input section to output. */
10588 todo -= address_size;
10589 if (! bfd_set_section_contents (output_bfd,
10597 offset += address_size;
10601 else if (! bfd_set_section_contents (output_bfd,
10615 /* Generate a reloc when linking an ELF file. This is a reloc
10616 requested by the linker, and does not come from any input file. This
10617 is used to build constructor and destructor tables when linking
10621 elf_reloc_link_order (bfd *output_bfd,
10622 struct bfd_link_info *info,
10623 asection *output_section,
10624 struct bfd_link_order *link_order)
10626 reloc_howto_type *howto;
10630 struct bfd_elf_section_reloc_data *reldata;
10631 struct elf_link_hash_entry **rel_hash_ptr;
10632 Elf_Internal_Shdr *rel_hdr;
10633 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10634 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10637 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10639 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10642 bfd_set_error (bfd_error_bad_value);
10646 addend = link_order->u.reloc.p->addend;
10649 reldata = &esdo->rel;
10650 else if (esdo->rela.hdr)
10651 reldata = &esdo->rela;
10658 /* Figure out the symbol index. */
10659 rel_hash_ptr = reldata->hashes + reldata->count;
10660 if (link_order->type == bfd_section_reloc_link_order)
10662 indx = link_order->u.reloc.p->u.section->target_index;
10663 BFD_ASSERT (indx != 0);
10664 *rel_hash_ptr = NULL;
10668 struct elf_link_hash_entry *h;
10670 /* Treat a reloc against a defined symbol as though it were
10671 actually against the section. */
10672 h = ((struct elf_link_hash_entry *)
10673 bfd_wrapped_link_hash_lookup (output_bfd, info,
10674 link_order->u.reloc.p->u.name,
10675 FALSE, FALSE, TRUE));
10677 && (h->root.type == bfd_link_hash_defined
10678 || h->root.type == bfd_link_hash_defweak))
10682 section = h->root.u.def.section;
10683 indx = section->output_section->target_index;
10684 *rel_hash_ptr = NULL;
10685 /* It seems that we ought to add the symbol value to the
10686 addend here, but in practice it has already been added
10687 because it was passed to constructor_callback. */
10688 addend += section->output_section->vma + section->output_offset;
10690 else if (h != NULL)
10692 /* Setting the index to -2 tells elf_link_output_extsym that
10693 this symbol is used by a reloc. */
10700 if (! ((*info->callbacks->unattached_reloc)
10701 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10707 /* If this is an inplace reloc, we must write the addend into the
10709 if (howto->partial_inplace && addend != 0)
10711 bfd_size_type size;
10712 bfd_reloc_status_type rstat;
10715 const char *sym_name;
10717 size = (bfd_size_type) bfd_get_reloc_size (howto);
10718 buf = (bfd_byte *) bfd_zmalloc (size);
10719 if (buf == NULL && size != 0)
10721 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10728 case bfd_reloc_outofrange:
10731 case bfd_reloc_overflow:
10732 if (link_order->type == bfd_section_reloc_link_order)
10733 sym_name = bfd_section_name (output_bfd,
10734 link_order->u.reloc.p->u.section);
10736 sym_name = link_order->u.reloc.p->u.name;
10737 if (! ((*info->callbacks->reloc_overflow)
10738 (info, NULL, sym_name, howto->name, addend, NULL,
10739 NULL, (bfd_vma) 0)))
10747 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10749 * bfd_octets_per_byte (output_bfd),
10756 /* The address of a reloc is relative to the section in a
10757 relocatable file, and is a virtual address in an executable
10759 offset = link_order->offset;
10760 if (! bfd_link_relocatable (info))
10761 offset += output_section->vma;
10763 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10765 irel[i].r_offset = offset;
10766 irel[i].r_info = 0;
10767 irel[i].r_addend = 0;
10769 if (bed->s->arch_size == 32)
10770 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10772 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10774 rel_hdr = reldata->hdr;
10775 erel = rel_hdr->contents;
10776 if (rel_hdr->sh_type == SHT_REL)
10778 erel += reldata->count * bed->s->sizeof_rel;
10779 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10783 irel[0].r_addend = addend;
10784 erel += reldata->count * bed->s->sizeof_rela;
10785 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10794 /* Get the output vma of the section pointed to by the sh_link field. */
10797 elf_get_linked_section_vma (struct bfd_link_order *p)
10799 Elf_Internal_Shdr **elf_shdrp;
10803 s = p->u.indirect.section;
10804 elf_shdrp = elf_elfsections (s->owner);
10805 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10806 elfsec = elf_shdrp[elfsec]->sh_link;
10808 The Intel C compiler generates SHT_IA_64_UNWIND with
10809 SHF_LINK_ORDER. But it doesn't set the sh_link or
10810 sh_info fields. Hence we could get the situation
10811 where elfsec is 0. */
10814 const struct elf_backend_data *bed
10815 = get_elf_backend_data (s->owner);
10816 if (bed->link_order_error_handler)
10817 bed->link_order_error_handler
10818 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10823 s = elf_shdrp[elfsec]->bfd_section;
10824 return s->output_section->vma + s->output_offset;
10829 /* Compare two sections based on the locations of the sections they are
10830 linked to. Used by elf_fixup_link_order. */
10833 compare_link_order (const void * a, const void * b)
10838 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10839 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10842 return apos > bpos;
10846 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10847 order as their linked sections. Returns false if this could not be done
10848 because an output section includes both ordered and unordered
10849 sections. Ideally we'd do this in the linker proper. */
10852 elf_fixup_link_order (bfd *abfd, asection *o)
10854 int seen_linkorder;
10857 struct bfd_link_order *p;
10859 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10861 struct bfd_link_order **sections;
10862 asection *s, *other_sec, *linkorder_sec;
10866 linkorder_sec = NULL;
10868 seen_linkorder = 0;
10869 for (p = o->map_head.link_order; p != NULL; p = p->next)
10871 if (p->type == bfd_indirect_link_order)
10873 s = p->u.indirect.section;
10875 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10876 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10877 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10878 && elfsec < elf_numsections (sub)
10879 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10880 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10894 if (seen_other && seen_linkorder)
10896 if (other_sec && linkorder_sec)
10897 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10899 linkorder_sec->owner, other_sec,
10902 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10904 bfd_set_error (bfd_error_bad_value);
10909 if (!seen_linkorder)
10912 sections = (struct bfd_link_order **)
10913 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10914 if (sections == NULL)
10916 seen_linkorder = 0;
10918 for (p = o->map_head.link_order; p != NULL; p = p->next)
10920 sections[seen_linkorder++] = p;
10922 /* Sort the input sections in the order of their linked section. */
10923 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10924 compare_link_order);
10926 /* Change the offsets of the sections. */
10928 for (n = 0; n < seen_linkorder; n++)
10930 s = sections[n]->u.indirect.section;
10931 offset &= ~(bfd_vma) 0 << s->alignment_power;
10932 s->output_offset = offset / bfd_octets_per_byte (abfd);
10933 sections[n]->offset = offset;
10934 offset += sections[n]->size;
10942 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10946 if (flinfo->symstrtab != NULL)
10947 _bfd_elf_strtab_free (flinfo->symstrtab);
10948 if (flinfo->contents != NULL)
10949 free (flinfo->contents);
10950 if (flinfo->external_relocs != NULL)
10951 free (flinfo->external_relocs);
10952 if (flinfo->internal_relocs != NULL)
10953 free (flinfo->internal_relocs);
10954 if (flinfo->external_syms != NULL)
10955 free (flinfo->external_syms);
10956 if (flinfo->locsym_shndx != NULL)
10957 free (flinfo->locsym_shndx);
10958 if (flinfo->internal_syms != NULL)
10959 free (flinfo->internal_syms);
10960 if (flinfo->indices != NULL)
10961 free (flinfo->indices);
10962 if (flinfo->sections != NULL)
10963 free (flinfo->sections);
10964 if (flinfo->symshndxbuf != NULL)
10965 free (flinfo->symshndxbuf);
10966 for (o = obfd->sections; o != NULL; o = o->next)
10968 struct bfd_elf_section_data *esdo = elf_section_data (o);
10969 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10970 free (esdo->rel.hashes);
10971 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10972 free (esdo->rela.hashes);
10976 /* Do the final step of an ELF link. */
10979 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10981 bfd_boolean dynamic;
10982 bfd_boolean emit_relocs;
10984 struct elf_final_link_info flinfo;
10986 struct bfd_link_order *p;
10988 bfd_size_type max_contents_size;
10989 bfd_size_type max_external_reloc_size;
10990 bfd_size_type max_internal_reloc_count;
10991 bfd_size_type max_sym_count;
10992 bfd_size_type max_sym_shndx_count;
10993 Elf_Internal_Sym elfsym;
10995 Elf_Internal_Shdr *symtab_hdr;
10996 Elf_Internal_Shdr *symtab_shndx_hdr;
10997 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10998 struct elf_outext_info eoinfo;
10999 bfd_boolean merged;
11000 size_t relativecount = 0;
11001 asection *reldyn = 0;
11003 asection *attr_section = NULL;
11004 bfd_vma attr_size = 0;
11005 const char *std_attrs_section;
11007 if (! is_elf_hash_table (info->hash))
11010 if (bfd_link_pic (info))
11011 abfd->flags |= DYNAMIC;
11013 dynamic = elf_hash_table (info)->dynamic_sections_created;
11014 dynobj = elf_hash_table (info)->dynobj;
11016 emit_relocs = (bfd_link_relocatable (info)
11017 || info->emitrelocations);
11019 flinfo.info = info;
11020 flinfo.output_bfd = abfd;
11021 flinfo.symstrtab = _bfd_elf_strtab_init ();
11022 if (flinfo.symstrtab == NULL)
11027 flinfo.hash_sec = NULL;
11028 flinfo.symver_sec = NULL;
11032 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
11033 /* Note that dynsym_sec can be NULL (on VMS). */
11034 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
11035 /* Note that it is OK if symver_sec is NULL. */
11038 flinfo.contents = NULL;
11039 flinfo.external_relocs = NULL;
11040 flinfo.internal_relocs = NULL;
11041 flinfo.external_syms = NULL;
11042 flinfo.locsym_shndx = NULL;
11043 flinfo.internal_syms = NULL;
11044 flinfo.indices = NULL;
11045 flinfo.sections = NULL;
11046 flinfo.symshndxbuf = NULL;
11047 flinfo.filesym_count = 0;
11049 /* The object attributes have been merged. Remove the input
11050 sections from the link, and set the contents of the output
11052 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
11053 for (o = abfd->sections; o != NULL; o = o->next)
11055 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
11056 || strcmp (o->name, ".gnu.attributes") == 0)
11058 for (p = o->map_head.link_order; p != NULL; p = p->next)
11060 asection *input_section;
11062 if (p->type != bfd_indirect_link_order)
11064 input_section = p->u.indirect.section;
11065 /* Hack: reset the SEC_HAS_CONTENTS flag so that
11066 elf_link_input_bfd ignores this section. */
11067 input_section->flags &= ~SEC_HAS_CONTENTS;
11070 attr_size = bfd_elf_obj_attr_size (abfd);
11073 bfd_set_section_size (abfd, o, attr_size);
11075 /* Skip this section later on. */
11076 o->map_head.link_order = NULL;
11079 o->flags |= SEC_EXCLUDE;
11083 /* Count up the number of relocations we will output for each output
11084 section, so that we know the sizes of the reloc sections. We
11085 also figure out some maximum sizes. */
11086 max_contents_size = 0;
11087 max_external_reloc_size = 0;
11088 max_internal_reloc_count = 0;
11090 max_sym_shndx_count = 0;
11092 for (o = abfd->sections; o != NULL; o = o->next)
11094 struct bfd_elf_section_data *esdo = elf_section_data (o);
11095 o->reloc_count = 0;
11097 for (p = o->map_head.link_order; p != NULL; p = p->next)
11099 unsigned int reloc_count = 0;
11100 unsigned int additional_reloc_count = 0;
11101 struct bfd_elf_section_data *esdi = NULL;
11103 if (p->type == bfd_section_reloc_link_order
11104 || p->type == bfd_symbol_reloc_link_order)
11106 else if (p->type == bfd_indirect_link_order)
11110 sec = p->u.indirect.section;
11111 esdi = elf_section_data (sec);
11113 /* Mark all sections which are to be included in the
11114 link. This will normally be every section. We need
11115 to do this so that we can identify any sections which
11116 the linker has decided to not include. */
11117 sec->linker_mark = TRUE;
11119 if (sec->flags & SEC_MERGE)
11122 if (esdo->this_hdr.sh_type == SHT_REL
11123 || esdo->this_hdr.sh_type == SHT_RELA)
11124 /* Some backends use reloc_count in relocation sections
11125 to count particular types of relocs. Of course,
11126 reloc sections themselves can't have relocations. */
11128 else if (emit_relocs)
11130 reloc_count = sec->reloc_count;
11131 if (bed->elf_backend_count_additional_relocs)
11134 c = (*bed->elf_backend_count_additional_relocs) (sec);
11135 additional_reloc_count += c;
11138 else if (bed->elf_backend_count_relocs)
11139 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
11141 if (sec->rawsize > max_contents_size)
11142 max_contents_size = sec->rawsize;
11143 if (sec->size > max_contents_size)
11144 max_contents_size = sec->size;
11146 /* We are interested in just local symbols, not all
11148 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
11149 && (sec->owner->flags & DYNAMIC) == 0)
11153 if (elf_bad_symtab (sec->owner))
11154 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
11155 / bed->s->sizeof_sym);
11157 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
11159 if (sym_count > max_sym_count)
11160 max_sym_count = sym_count;
11162 if (sym_count > max_sym_shndx_count
11163 && elf_symtab_shndx_list (sec->owner) != NULL)
11164 max_sym_shndx_count = sym_count;
11166 if ((sec->flags & SEC_RELOC) != 0)
11168 size_t ext_size = 0;
11170 if (esdi->rel.hdr != NULL)
11171 ext_size = esdi->rel.hdr->sh_size;
11172 if (esdi->rela.hdr != NULL)
11173 ext_size += esdi->rela.hdr->sh_size;
11175 if (ext_size > max_external_reloc_size)
11176 max_external_reloc_size = ext_size;
11177 if (sec->reloc_count > max_internal_reloc_count)
11178 max_internal_reloc_count = sec->reloc_count;
11183 if (reloc_count == 0)
11186 reloc_count += additional_reloc_count;
11187 o->reloc_count += reloc_count;
11189 if (p->type == bfd_indirect_link_order && emit_relocs)
11193 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
11194 esdo->rel.count += additional_reloc_count;
11196 if (esdi->rela.hdr)
11198 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
11199 esdo->rela.count += additional_reloc_count;
11205 esdo->rela.count += reloc_count;
11207 esdo->rel.count += reloc_count;
11211 if (o->reloc_count > 0)
11212 o->flags |= SEC_RELOC;
11215 /* Explicitly clear the SEC_RELOC flag. The linker tends to
11216 set it (this is probably a bug) and if it is set
11217 assign_section_numbers will create a reloc section. */
11218 o->flags &=~ SEC_RELOC;
11221 /* If the SEC_ALLOC flag is not set, force the section VMA to
11222 zero. This is done in elf_fake_sections as well, but forcing
11223 the VMA to 0 here will ensure that relocs against these
11224 sections are handled correctly. */
11225 if ((o->flags & SEC_ALLOC) == 0
11226 && ! o->user_set_vma)
11230 if (! bfd_link_relocatable (info) && merged)
11231 elf_link_hash_traverse (elf_hash_table (info),
11232 _bfd_elf_link_sec_merge_syms, abfd);
11234 /* Figure out the file positions for everything but the symbol table
11235 and the relocs. We set symcount to force assign_section_numbers
11236 to create a symbol table. */
11237 bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
11238 BFD_ASSERT (! abfd->output_has_begun);
11239 if (! _bfd_elf_compute_section_file_positions (abfd, info))
11242 /* Set sizes, and assign file positions for reloc sections. */
11243 for (o = abfd->sections; o != NULL; o = o->next)
11245 struct bfd_elf_section_data *esdo = elf_section_data (o);
11246 if ((o->flags & SEC_RELOC) != 0)
11249 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
11253 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
11257 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
11258 to count upwards while actually outputting the relocations. */
11259 esdo->rel.count = 0;
11260 esdo->rela.count = 0;
11262 if (esdo->this_hdr.sh_offset == (file_ptr) -1)
11264 /* Cache the section contents so that they can be compressed
11265 later. Use bfd_malloc since it will be freed by
11266 bfd_compress_section_contents. */
11267 unsigned char *contents = esdo->this_hdr.contents;
11268 if ((o->flags & SEC_ELF_COMPRESS) == 0 || contents != NULL)
11271 = (unsigned char *) bfd_malloc (esdo->this_hdr.sh_size);
11272 if (contents == NULL)
11274 esdo->this_hdr.contents = contents;
11278 /* We have now assigned file positions for all the sections except
11279 .symtab, .strtab, and non-loaded reloc sections. We start the
11280 .symtab section at the current file position, and write directly
11281 to it. We build the .strtab section in memory. */
11282 bfd_get_symcount (abfd) = 0;
11283 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11284 /* sh_name is set in prep_headers. */
11285 symtab_hdr->sh_type = SHT_SYMTAB;
11286 /* sh_flags, sh_addr and sh_size all start off zero. */
11287 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
11288 /* sh_link is set in assign_section_numbers. */
11289 /* sh_info is set below. */
11290 /* sh_offset is set just below. */
11291 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
11293 if (max_sym_count < 20)
11294 max_sym_count = 20;
11295 elf_hash_table (info)->strtabsize = max_sym_count;
11296 amt = max_sym_count * sizeof (struct elf_sym_strtab);
11297 elf_hash_table (info)->strtab
11298 = (struct elf_sym_strtab *) bfd_malloc (amt);
11299 if (elf_hash_table (info)->strtab == NULL)
11301 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
11303 = (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF)
11304 ? (Elf_External_Sym_Shndx *) -1 : NULL);
11306 if (info->strip != strip_all || emit_relocs)
11308 file_ptr off = elf_next_file_pos (abfd);
11310 _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
11312 /* Note that at this point elf_next_file_pos (abfd) is
11313 incorrect. We do not yet know the size of the .symtab section.
11314 We correct next_file_pos below, after we do know the size. */
11316 /* Start writing out the symbol table. The first symbol is always a
11318 elfsym.st_value = 0;
11319 elfsym.st_size = 0;
11320 elfsym.st_info = 0;
11321 elfsym.st_other = 0;
11322 elfsym.st_shndx = SHN_UNDEF;
11323 elfsym.st_target_internal = 0;
11324 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym,
11325 bfd_und_section_ptr, NULL) != 1)
11328 /* Output a symbol for each section. We output these even if we are
11329 discarding local symbols, since they are used for relocs. These
11330 symbols have no names. We store the index of each one in the
11331 index field of the section, so that we can find it again when
11332 outputting relocs. */
11334 elfsym.st_size = 0;
11335 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11336 elfsym.st_other = 0;
11337 elfsym.st_value = 0;
11338 elfsym.st_target_internal = 0;
11339 for (i = 1; i < elf_numsections (abfd); i++)
11341 o = bfd_section_from_elf_index (abfd, i);
11344 o->target_index = bfd_get_symcount (abfd);
11345 elfsym.st_shndx = i;
11346 if (!bfd_link_relocatable (info))
11347 elfsym.st_value = o->vma;
11348 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym, o,
11355 /* Allocate some memory to hold information read in from the input
11357 if (max_contents_size != 0)
11359 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
11360 if (flinfo.contents == NULL)
11364 if (max_external_reloc_size != 0)
11366 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
11367 if (flinfo.external_relocs == NULL)
11371 if (max_internal_reloc_count != 0)
11373 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
11374 amt *= sizeof (Elf_Internal_Rela);
11375 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
11376 if (flinfo.internal_relocs == NULL)
11380 if (max_sym_count != 0)
11382 amt = max_sym_count * bed->s->sizeof_sym;
11383 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
11384 if (flinfo.external_syms == NULL)
11387 amt = max_sym_count * sizeof (Elf_Internal_Sym);
11388 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
11389 if (flinfo.internal_syms == NULL)
11392 amt = max_sym_count * sizeof (long);
11393 flinfo.indices = (long int *) bfd_malloc (amt);
11394 if (flinfo.indices == NULL)
11397 amt = max_sym_count * sizeof (asection *);
11398 flinfo.sections = (asection **) bfd_malloc (amt);
11399 if (flinfo.sections == NULL)
11403 if (max_sym_shndx_count != 0)
11405 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
11406 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
11407 if (flinfo.locsym_shndx == NULL)
11411 if (elf_hash_table (info)->tls_sec)
11413 bfd_vma base, end = 0;
11416 for (sec = elf_hash_table (info)->tls_sec;
11417 sec && (sec->flags & SEC_THREAD_LOCAL);
11420 bfd_size_type size = sec->size;
11423 && (sec->flags & SEC_HAS_CONTENTS) == 0)
11425 struct bfd_link_order *ord = sec->map_tail.link_order;
11428 size = ord->offset + ord->size;
11430 end = sec->vma + size;
11432 base = elf_hash_table (info)->tls_sec->vma;
11433 /* Only align end of TLS section if static TLS doesn't have special
11434 alignment requirements. */
11435 if (bed->static_tls_alignment == 1)
11436 end = align_power (end,
11437 elf_hash_table (info)->tls_sec->alignment_power);
11438 elf_hash_table (info)->tls_size = end - base;
11441 /* Reorder SHF_LINK_ORDER sections. */
11442 for (o = abfd->sections; o != NULL; o = o->next)
11444 if (!elf_fixup_link_order (abfd, o))
11448 if (!_bfd_elf_fixup_eh_frame_hdr (info))
11451 /* Since ELF permits relocations to be against local symbols, we
11452 must have the local symbols available when we do the relocations.
11453 Since we would rather only read the local symbols once, and we
11454 would rather not keep them in memory, we handle all the
11455 relocations for a single input file at the same time.
11457 Unfortunately, there is no way to know the total number of local
11458 symbols until we have seen all of them, and the local symbol
11459 indices precede the global symbol indices. This means that when
11460 we are generating relocatable output, and we see a reloc against
11461 a global symbol, we can not know the symbol index until we have
11462 finished examining all the local symbols to see which ones we are
11463 going to output. To deal with this, we keep the relocations in
11464 memory, and don't output them until the end of the link. This is
11465 an unfortunate waste of memory, but I don't see a good way around
11466 it. Fortunately, it only happens when performing a relocatable
11467 link, which is not the common case. FIXME: If keep_memory is set
11468 we could write the relocs out and then read them again; I don't
11469 know how bad the memory loss will be. */
11471 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11472 sub->output_has_begun = FALSE;
11473 for (o = abfd->sections; o != NULL; o = o->next)
11475 for (p = o->map_head.link_order; p != NULL; p = p->next)
11477 if (p->type == bfd_indirect_link_order
11478 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
11479 == bfd_target_elf_flavour)
11480 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
11482 if (! sub->output_has_begun)
11484 if (! elf_link_input_bfd (&flinfo, sub))
11486 sub->output_has_begun = TRUE;
11489 else if (p->type == bfd_section_reloc_link_order
11490 || p->type == bfd_symbol_reloc_link_order)
11492 if (! elf_reloc_link_order (abfd, info, o, p))
11497 if (! _bfd_default_link_order (abfd, info, o, p))
11499 if (p->type == bfd_indirect_link_order
11500 && (bfd_get_flavour (sub)
11501 == bfd_target_elf_flavour)
11502 && (elf_elfheader (sub)->e_ident[EI_CLASS]
11503 != bed->s->elfclass))
11505 const char *iclass, *oclass;
11507 switch (bed->s->elfclass)
11509 case ELFCLASS64: oclass = "ELFCLASS64"; break;
11510 case ELFCLASS32: oclass = "ELFCLASS32"; break;
11511 case ELFCLASSNONE: oclass = "ELFCLASSNONE"; break;
11515 switch (elf_elfheader (sub)->e_ident[EI_CLASS])
11517 case ELFCLASS64: iclass = "ELFCLASS64"; break;
11518 case ELFCLASS32: iclass = "ELFCLASS32"; break;
11519 case ELFCLASSNONE: iclass = "ELFCLASSNONE"; break;
11523 bfd_set_error (bfd_error_wrong_format);
11524 (*_bfd_error_handler)
11525 (_("%B: file class %s incompatible with %s"),
11526 sub, iclass, oclass);
11535 /* Free symbol buffer if needed. */
11536 if (!info->reduce_memory_overheads)
11538 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11539 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
11540 && elf_tdata (sub)->symbuf)
11542 free (elf_tdata (sub)->symbuf);
11543 elf_tdata (sub)->symbuf = NULL;
11547 /* Output any global symbols that got converted to local in a
11548 version script or due to symbol visibility. We do this in a
11549 separate step since ELF requires all local symbols to appear
11550 prior to any global symbols. FIXME: We should only do this if
11551 some global symbols were, in fact, converted to become local.
11552 FIXME: Will this work correctly with the Irix 5 linker? */
11553 eoinfo.failed = FALSE;
11554 eoinfo.flinfo = &flinfo;
11555 eoinfo.localsyms = TRUE;
11556 eoinfo.file_sym_done = FALSE;
11557 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11561 /* If backend needs to output some local symbols not present in the hash
11562 table, do it now. */
11563 if (bed->elf_backend_output_arch_local_syms
11564 && (info->strip != strip_all || emit_relocs))
11566 typedef int (*out_sym_func)
11567 (void *, const char *, Elf_Internal_Sym *, asection *,
11568 struct elf_link_hash_entry *);
11570 if (! ((*bed->elf_backend_output_arch_local_syms)
11571 (abfd, info, &flinfo,
11572 (out_sym_func) elf_link_output_symstrtab)))
11576 /* That wrote out all the local symbols. Finish up the symbol table
11577 with the global symbols. Even if we want to strip everything we
11578 can, we still need to deal with those global symbols that got
11579 converted to local in a version script. */
11581 /* The sh_info field records the index of the first non local symbol. */
11582 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11585 && elf_hash_table (info)->dynsym != NULL
11586 && (elf_hash_table (info)->dynsym->output_section
11587 != bfd_abs_section_ptr))
11589 Elf_Internal_Sym sym;
11590 bfd_byte *dynsym = elf_hash_table (info)->dynsym->contents;
11591 long last_local = 0;
11593 /* Write out the section symbols for the output sections. */
11594 if (bfd_link_pic (info)
11595 || elf_hash_table (info)->is_relocatable_executable)
11601 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11603 sym.st_target_internal = 0;
11605 for (s = abfd->sections; s != NULL; s = s->next)
11611 dynindx = elf_section_data (s)->dynindx;
11614 indx = elf_section_data (s)->this_idx;
11615 BFD_ASSERT (indx > 0);
11616 sym.st_shndx = indx;
11617 if (! check_dynsym (abfd, &sym))
11619 sym.st_value = s->vma;
11620 dest = dynsym + dynindx * bed->s->sizeof_sym;
11621 if (last_local < dynindx)
11622 last_local = dynindx;
11623 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11627 /* Write out the local dynsyms. */
11628 if (elf_hash_table (info)->dynlocal)
11630 struct elf_link_local_dynamic_entry *e;
11631 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11636 /* Copy the internal symbol and turn off visibility.
11637 Note that we saved a word of storage and overwrote
11638 the original st_name with the dynstr_index. */
11640 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11642 s = bfd_section_from_elf_index (e->input_bfd,
11647 elf_section_data (s->output_section)->this_idx;
11648 if (! check_dynsym (abfd, &sym))
11650 sym.st_value = (s->output_section->vma
11652 + e->isym.st_value);
11655 if (last_local < e->dynindx)
11656 last_local = e->dynindx;
11658 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11659 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11663 elf_section_data (elf_hash_table (info)->dynsym->output_section)->this_hdr.sh_info =
11667 /* We get the global symbols from the hash table. */
11668 eoinfo.failed = FALSE;
11669 eoinfo.localsyms = FALSE;
11670 eoinfo.flinfo = &flinfo;
11671 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11675 /* If backend needs to output some symbols not present in the hash
11676 table, do it now. */
11677 if (bed->elf_backend_output_arch_syms
11678 && (info->strip != strip_all || emit_relocs))
11680 typedef int (*out_sym_func)
11681 (void *, const char *, Elf_Internal_Sym *, asection *,
11682 struct elf_link_hash_entry *);
11684 if (! ((*bed->elf_backend_output_arch_syms)
11685 (abfd, info, &flinfo,
11686 (out_sym_func) elf_link_output_symstrtab)))
11690 /* Finalize the .strtab section. */
11691 _bfd_elf_strtab_finalize (flinfo.symstrtab);
11693 /* Swap out the .strtab section. */
11694 if (!elf_link_swap_symbols_out (&flinfo))
11697 /* Now we know the size of the symtab section. */
11698 if (bfd_get_symcount (abfd) > 0)
11700 /* Finish up and write out the symbol string table (.strtab)
11702 Elf_Internal_Shdr *symstrtab_hdr;
11703 file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
11705 symtab_shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr;
11706 if (symtab_shndx_hdr != NULL && symtab_shndx_hdr->sh_name != 0)
11708 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11709 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11710 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11711 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11712 symtab_shndx_hdr->sh_size = amt;
11714 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11717 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11718 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11722 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11723 /* sh_name was set in prep_headers. */
11724 symstrtab_hdr->sh_type = SHT_STRTAB;
11725 symstrtab_hdr->sh_flags = bed->elf_strtab_flags;
11726 symstrtab_hdr->sh_addr = 0;
11727 symstrtab_hdr->sh_size = _bfd_elf_strtab_size (flinfo.symstrtab);
11728 symstrtab_hdr->sh_entsize = 0;
11729 symstrtab_hdr->sh_link = 0;
11730 symstrtab_hdr->sh_info = 0;
11731 /* sh_offset is set just below. */
11732 symstrtab_hdr->sh_addralign = 1;
11734 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
11736 elf_next_file_pos (abfd) = off;
11738 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11739 || ! _bfd_elf_strtab_emit (abfd, flinfo.symstrtab))
11743 /* Adjust the relocs to have the correct symbol indices. */
11744 for (o = abfd->sections; o != NULL; o = o->next)
11746 struct bfd_elf_section_data *esdo = elf_section_data (o);
11748 if ((o->flags & SEC_RELOC) == 0)
11751 sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o);
11752 if (esdo->rel.hdr != NULL
11753 && !elf_link_adjust_relocs (abfd, &esdo->rel, sort))
11755 if (esdo->rela.hdr != NULL
11756 && !elf_link_adjust_relocs (abfd, &esdo->rela, sort))
11759 /* Set the reloc_count field to 0 to prevent write_relocs from
11760 trying to swap the relocs out itself. */
11761 o->reloc_count = 0;
11764 if (dynamic && info->combreloc && dynobj != NULL)
11765 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11767 /* If we are linking against a dynamic object, or generating a
11768 shared library, finish up the dynamic linking information. */
11771 bfd_byte *dyncon, *dynconend;
11773 /* Fix up .dynamic entries. */
11774 o = bfd_get_linker_section (dynobj, ".dynamic");
11775 BFD_ASSERT (o != NULL);
11777 dyncon = o->contents;
11778 dynconend = o->contents + o->size;
11779 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11781 Elf_Internal_Dyn dyn;
11785 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11792 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11794 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11796 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11797 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11800 dyn.d_un.d_val = relativecount;
11807 name = info->init_function;
11810 name = info->fini_function;
11813 struct elf_link_hash_entry *h;
11815 h = elf_link_hash_lookup (elf_hash_table (info), name,
11816 FALSE, FALSE, TRUE);
11818 && (h->root.type == bfd_link_hash_defined
11819 || h->root.type == bfd_link_hash_defweak))
11821 dyn.d_un.d_ptr = h->root.u.def.value;
11822 o = h->root.u.def.section;
11823 if (o->output_section != NULL)
11824 dyn.d_un.d_ptr += (o->output_section->vma
11825 + o->output_offset);
11828 /* The symbol is imported from another shared
11829 library and does not apply to this one. */
11830 dyn.d_un.d_ptr = 0;
11837 case DT_PREINIT_ARRAYSZ:
11838 name = ".preinit_array";
11840 case DT_INIT_ARRAYSZ:
11841 name = ".init_array";
11843 case DT_FINI_ARRAYSZ:
11844 name = ".fini_array";
11846 o = bfd_get_section_by_name (abfd, name);
11849 (*_bfd_error_handler)
11850 (_("%B: could not find output section %s"), abfd, name);
11854 (*_bfd_error_handler)
11855 (_("warning: %s section has zero size"), name);
11856 dyn.d_un.d_val = o->size;
11859 case DT_PREINIT_ARRAY:
11860 name = ".preinit_array";
11862 case DT_INIT_ARRAY:
11863 name = ".init_array";
11865 case DT_FINI_ARRAY:
11866 name = ".fini_array";
11873 name = ".gnu.hash";
11882 name = ".gnu.version_d";
11885 name = ".gnu.version_r";
11888 name = ".gnu.version";
11890 o = bfd_get_section_by_name (abfd, name);
11893 (*_bfd_error_handler)
11894 (_("%B: could not find output section %s"), abfd, name);
11897 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11899 (*_bfd_error_handler)
11900 (_("warning: section '%s' is being made into a note"), name);
11901 bfd_set_error (bfd_error_nonrepresentable_section);
11904 dyn.d_un.d_ptr = o->vma;
11911 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11915 dyn.d_un.d_val = 0;
11916 dyn.d_un.d_ptr = 0;
11917 for (i = 1; i < elf_numsections (abfd); i++)
11919 Elf_Internal_Shdr *hdr;
11921 hdr = elf_elfsections (abfd)[i];
11922 if (hdr->sh_type == type
11923 && (hdr->sh_flags & SHF_ALLOC) != 0)
11925 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11926 dyn.d_un.d_val += hdr->sh_size;
11929 if (dyn.d_un.d_ptr == 0
11930 || hdr->sh_addr < dyn.d_un.d_ptr)
11931 dyn.d_un.d_ptr = hdr->sh_addr;
11937 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11941 /* If we have created any dynamic sections, then output them. */
11942 if (dynobj != NULL)
11944 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11947 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11948 if (((info->warn_shared_textrel && bfd_link_pic (info))
11949 || info->error_textrel)
11950 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11952 bfd_byte *dyncon, *dynconend;
11954 dyncon = o->contents;
11955 dynconend = o->contents + o->size;
11956 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11958 Elf_Internal_Dyn dyn;
11960 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11962 if (dyn.d_tag == DT_TEXTREL)
11964 if (info->error_textrel)
11965 info->callbacks->einfo
11966 (_("%P%X: read-only segment has dynamic relocations.\n"));
11968 info->callbacks->einfo
11969 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11975 for (o = dynobj->sections; o != NULL; o = o->next)
11977 if ((o->flags & SEC_HAS_CONTENTS) == 0
11979 || o->output_section == bfd_abs_section_ptr)
11981 if ((o->flags & SEC_LINKER_CREATED) == 0)
11983 /* At this point, we are only interested in sections
11984 created by _bfd_elf_link_create_dynamic_sections. */
11987 if (elf_hash_table (info)->stab_info.stabstr == o)
11989 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11991 if (strcmp (o->name, ".dynstr") != 0)
11993 if (! bfd_set_section_contents (abfd, o->output_section,
11995 (file_ptr) o->output_offset
11996 * bfd_octets_per_byte (abfd),
12002 /* The contents of the .dynstr section are actually in a
12006 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
12007 if (bfd_seek (abfd, off, SEEK_SET) != 0
12008 || ! _bfd_elf_strtab_emit (abfd,
12009 elf_hash_table (info)->dynstr))
12015 if (bfd_link_relocatable (info))
12017 bfd_boolean failed = FALSE;
12019 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
12024 /* If we have optimized stabs strings, output them. */
12025 if (elf_hash_table (info)->stab_info.stabstr != NULL)
12027 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
12031 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
12034 elf_final_link_free (abfd, &flinfo);
12036 elf_linker (abfd) = TRUE;
12040 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
12041 if (contents == NULL)
12042 return FALSE; /* Bail out and fail. */
12043 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
12044 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
12051 elf_final_link_free (abfd, &flinfo);
12055 /* Initialize COOKIE for input bfd ABFD. */
12058 init_reloc_cookie (struct elf_reloc_cookie *cookie,
12059 struct bfd_link_info *info, bfd *abfd)
12061 Elf_Internal_Shdr *symtab_hdr;
12062 const struct elf_backend_data *bed;
12064 bed = get_elf_backend_data (abfd);
12065 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12067 cookie->abfd = abfd;
12068 cookie->sym_hashes = elf_sym_hashes (abfd);
12069 cookie->bad_symtab = elf_bad_symtab (abfd);
12070 if (cookie->bad_symtab)
12072 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12073 cookie->extsymoff = 0;
12077 cookie->locsymcount = symtab_hdr->sh_info;
12078 cookie->extsymoff = symtab_hdr->sh_info;
12081 if (bed->s->arch_size == 32)
12082 cookie->r_sym_shift = 8;
12084 cookie->r_sym_shift = 32;
12086 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
12087 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
12089 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
12090 cookie->locsymcount, 0,
12092 if (cookie->locsyms == NULL)
12094 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
12097 if (info->keep_memory)
12098 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
12103 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
12106 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
12108 Elf_Internal_Shdr *symtab_hdr;
12110 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12111 if (cookie->locsyms != NULL
12112 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
12113 free (cookie->locsyms);
12116 /* Initialize the relocation information in COOKIE for input section SEC
12117 of input bfd ABFD. */
12120 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12121 struct bfd_link_info *info, bfd *abfd,
12124 const struct elf_backend_data *bed;
12126 if (sec->reloc_count == 0)
12128 cookie->rels = NULL;
12129 cookie->relend = NULL;
12133 bed = get_elf_backend_data (abfd);
12135 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
12136 info->keep_memory);
12137 if (cookie->rels == NULL)
12139 cookie->rel = cookie->rels;
12140 cookie->relend = (cookie->rels
12141 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
12143 cookie->rel = cookie->rels;
12147 /* Free the memory allocated by init_reloc_cookie_rels,
12151 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12154 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
12155 free (cookie->rels);
12158 /* Initialize the whole of COOKIE for input section SEC. */
12161 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12162 struct bfd_link_info *info,
12165 if (!init_reloc_cookie (cookie, info, sec->owner))
12167 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
12172 fini_reloc_cookie (cookie, sec->owner);
12177 /* Free the memory allocated by init_reloc_cookie_for_section,
12181 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12184 fini_reloc_cookie_rels (cookie, sec);
12185 fini_reloc_cookie (cookie, sec->owner);
12188 /* Garbage collect unused sections. */
12190 /* Default gc_mark_hook. */
12193 _bfd_elf_gc_mark_hook (asection *sec,
12194 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12195 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
12196 struct elf_link_hash_entry *h,
12197 Elf_Internal_Sym *sym)
12201 switch (h->root.type)
12203 case bfd_link_hash_defined:
12204 case bfd_link_hash_defweak:
12205 return h->root.u.def.section;
12207 case bfd_link_hash_common:
12208 return h->root.u.c.p->section;
12215 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
12220 /* COOKIE->rel describes a relocation against section SEC, which is
12221 a section we've decided to keep. Return the section that contains
12222 the relocation symbol, or NULL if no section contains it. */
12225 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
12226 elf_gc_mark_hook_fn gc_mark_hook,
12227 struct elf_reloc_cookie *cookie,
12228 bfd_boolean *start_stop)
12230 unsigned long r_symndx;
12231 struct elf_link_hash_entry *h;
12233 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
12234 if (r_symndx == STN_UNDEF)
12237 if (r_symndx >= cookie->locsymcount
12238 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12240 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
12243 info->callbacks->einfo (_("%F%P: corrupt input: %B\n"),
12247 while (h->root.type == bfd_link_hash_indirect
12248 || h->root.type == bfd_link_hash_warning)
12249 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12251 /* If this symbol is weak and there is a non-weak definition, we
12252 keep the non-weak definition because many backends put
12253 dynamic reloc info on the non-weak definition for code
12254 handling copy relocs. */
12255 if (h->u.weakdef != NULL)
12256 h->u.weakdef->mark = 1;
12258 if (start_stop != NULL
12259 && (h->root.type == bfd_link_hash_undefined
12260 || h->root.type == bfd_link_hash_undefweak))
12262 /* To work around a glibc bug, mark all XXX input sections
12263 when there is an as yet undefined reference to __start_XXX
12264 or __stop_XXX symbols. The linker will later define such
12265 symbols for orphan input sections that have a name
12266 representable as a C identifier. */
12267 const char *sec_name = NULL;
12268 if (strncmp (h->root.root.string, "__start_", 8) == 0)
12269 sec_name = h->root.root.string + 8;
12270 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
12271 sec_name = h->root.root.string + 7;
12273 if (sec_name != NULL && *sec_name != '\0')
12277 for (i = info->input_bfds; i != NULL; i = i->link.next)
12279 asection *s = bfd_get_section_by_name (i, sec_name);
12280 if (s != NULL && !s->gc_mark)
12282 *start_stop = TRUE;
12289 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
12292 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
12293 &cookie->locsyms[r_symndx]);
12296 /* COOKIE->rel describes a relocation against section SEC, which is
12297 a section we've decided to keep. Mark the section that contains
12298 the relocation symbol. */
12301 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
12303 elf_gc_mark_hook_fn gc_mark_hook,
12304 struct elf_reloc_cookie *cookie)
12307 bfd_boolean start_stop = FALSE;
12309 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie, &start_stop);
12310 while (rsec != NULL)
12312 if (!rsec->gc_mark)
12314 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
12315 || (rsec->owner->flags & DYNAMIC) != 0)
12317 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
12322 rsec = bfd_get_next_section_by_name (rsec->owner, rsec);
12327 /* The mark phase of garbage collection. For a given section, mark
12328 it and any sections in this section's group, and all the sections
12329 which define symbols to which it refers. */
12332 _bfd_elf_gc_mark (struct bfd_link_info *info,
12334 elf_gc_mark_hook_fn gc_mark_hook)
12337 asection *group_sec, *eh_frame;
12341 /* Mark all the sections in the group. */
12342 group_sec = elf_section_data (sec)->next_in_group;
12343 if (group_sec && !group_sec->gc_mark)
12344 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
12347 /* Look through the section relocs. */
12349 eh_frame = elf_eh_frame_section (sec->owner);
12350 if ((sec->flags & SEC_RELOC) != 0
12351 && sec->reloc_count > 0
12352 && sec != eh_frame)
12354 struct elf_reloc_cookie cookie;
12356 if (!init_reloc_cookie_for_section (&cookie, info, sec))
12360 for (; cookie.rel < cookie.relend; cookie.rel++)
12361 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
12366 fini_reloc_cookie_for_section (&cookie, sec);
12370 if (ret && eh_frame && elf_fde_list (sec))
12372 struct elf_reloc_cookie cookie;
12374 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
12378 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
12379 gc_mark_hook, &cookie))
12381 fini_reloc_cookie_for_section (&cookie, eh_frame);
12385 eh_frame = elf_section_eh_frame_entry (sec);
12386 if (ret && eh_frame && !eh_frame->gc_mark)
12387 if (!_bfd_elf_gc_mark (info, eh_frame, gc_mark_hook))
12393 /* Scan and mark sections in a special or debug section group. */
12396 _bfd_elf_gc_mark_debug_special_section_group (asection *grp)
12398 /* Point to first section of section group. */
12400 /* Used to iterate the section group. */
12403 bfd_boolean is_special_grp = TRUE;
12404 bfd_boolean is_debug_grp = TRUE;
12406 /* First scan to see if group contains any section other than debug
12407 and special section. */
12408 ssec = msec = elf_next_in_group (grp);
12411 if ((msec->flags & SEC_DEBUGGING) == 0)
12412 is_debug_grp = FALSE;
12414 if ((msec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) != 0)
12415 is_special_grp = FALSE;
12417 msec = elf_next_in_group (msec);
12419 while (msec != ssec);
12421 /* If this is a pure debug section group or pure special section group,
12422 keep all sections in this group. */
12423 if (is_debug_grp || is_special_grp)
12428 msec = elf_next_in_group (msec);
12430 while (msec != ssec);
12434 /* Keep debug and special sections. */
12437 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
12438 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
12442 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12445 bfd_boolean some_kept;
12446 bfd_boolean debug_frag_seen;
12448 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12451 /* Ensure all linker created sections are kept,
12452 see if any other section is already marked,
12453 and note if we have any fragmented debug sections. */
12454 debug_frag_seen = some_kept = FALSE;
12455 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12457 if ((isec->flags & SEC_LINKER_CREATED) != 0)
12459 else if (isec->gc_mark)
12462 if (debug_frag_seen == FALSE
12463 && (isec->flags & SEC_DEBUGGING)
12464 && CONST_STRNEQ (isec->name, ".debug_line."))
12465 debug_frag_seen = TRUE;
12468 /* If no section in this file will be kept, then we can
12469 toss out the debug and special sections. */
12473 /* Keep debug and special sections like .comment when they are
12474 not part of a group. Also keep section groups that contain
12475 just debug sections or special sections. */
12476 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12478 if ((isec->flags & SEC_GROUP) != 0)
12479 _bfd_elf_gc_mark_debug_special_section_group (isec);
12480 else if (((isec->flags & SEC_DEBUGGING) != 0
12481 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
12482 && elf_next_in_group (isec) == NULL)
12486 if (! debug_frag_seen)
12489 /* Look for CODE sections which are going to be discarded,
12490 and find and discard any fragmented debug sections which
12491 are associated with that code section. */
12492 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12493 if ((isec->flags & SEC_CODE) != 0
12494 && isec->gc_mark == 0)
12499 ilen = strlen (isec->name);
12501 /* Association is determined by the name of the debug section
12502 containing the name of the code section as a suffix. For
12503 example .debug_line.text.foo is a debug section associated
12505 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
12509 if (dsec->gc_mark == 0
12510 || (dsec->flags & SEC_DEBUGGING) == 0)
12513 dlen = strlen (dsec->name);
12516 && strncmp (dsec->name + (dlen - ilen),
12517 isec->name, ilen) == 0)
12527 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
12529 struct elf_gc_sweep_symbol_info
12531 struct bfd_link_info *info;
12532 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
12537 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
12540 && (((h->root.type == bfd_link_hash_defined
12541 || h->root.type == bfd_link_hash_defweak)
12542 && !((h->def_regular || ELF_COMMON_DEF_P (h))
12543 && h->root.u.def.section->gc_mark))
12544 || h->root.type == bfd_link_hash_undefined
12545 || h->root.type == bfd_link_hash_undefweak))
12547 struct elf_gc_sweep_symbol_info *inf;
12549 inf = (struct elf_gc_sweep_symbol_info *) data;
12550 (*inf->hide_symbol) (inf->info, h, TRUE);
12551 h->def_regular = 0;
12552 h->ref_regular = 0;
12553 h->ref_regular_nonweak = 0;
12559 /* The sweep phase of garbage collection. Remove all garbage sections. */
12561 typedef bfd_boolean (*gc_sweep_hook_fn)
12562 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
12565 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
12568 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12569 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
12570 unsigned long section_sym_count;
12571 struct elf_gc_sweep_symbol_info sweep_info;
12573 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12577 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12578 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12581 for (o = sub->sections; o != NULL; o = o->next)
12583 /* When any section in a section group is kept, we keep all
12584 sections in the section group. If the first member of
12585 the section group is excluded, we will also exclude the
12587 if (o->flags & SEC_GROUP)
12589 asection *first = elf_next_in_group (o);
12590 o->gc_mark = first->gc_mark;
12596 /* Skip sweeping sections already excluded. */
12597 if (o->flags & SEC_EXCLUDE)
12600 /* Since this is early in the link process, it is simple
12601 to remove a section from the output. */
12602 o->flags |= SEC_EXCLUDE;
12604 if (info->print_gc_sections && o->size != 0)
12605 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
12607 /* But we also have to update some of the relocation
12608 info we collected before. */
12610 && (o->flags & SEC_RELOC) != 0
12611 && o->reloc_count != 0
12612 && !((info->strip == strip_all || info->strip == strip_debugger)
12613 && (o->flags & SEC_DEBUGGING) != 0)
12614 && !bfd_is_abs_section (o->output_section))
12616 Elf_Internal_Rela *internal_relocs;
12620 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
12621 info->keep_memory);
12622 if (internal_relocs == NULL)
12625 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
12627 if (elf_section_data (o)->relocs != internal_relocs)
12628 free (internal_relocs);
12636 /* Remove the symbols that were in the swept sections from the dynamic
12637 symbol table. GCFIXME: Anyone know how to get them out of the
12638 static symbol table as well? */
12639 sweep_info.info = info;
12640 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
12641 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
12644 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
12648 /* Propagate collected vtable information. This is called through
12649 elf_link_hash_traverse. */
12652 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
12654 /* Those that are not vtables. */
12655 if (h->vtable == NULL || h->vtable->parent == NULL)
12658 /* Those vtables that do not have parents, we cannot merge. */
12659 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12662 /* If we've already been done, exit. */
12663 if (h->vtable->used && h->vtable->used[-1])
12666 /* Make sure the parent's table is up to date. */
12667 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12669 if (h->vtable->used == NULL)
12671 /* None of this table's entries were referenced. Re-use the
12673 h->vtable->used = h->vtable->parent->vtable->used;
12674 h->vtable->size = h->vtable->parent->vtable->size;
12679 bfd_boolean *cu, *pu;
12681 /* Or the parent's entries into ours. */
12682 cu = h->vtable->used;
12684 pu = h->vtable->parent->vtable->used;
12687 const struct elf_backend_data *bed;
12688 unsigned int log_file_align;
12690 bed = get_elf_backend_data (h->root.u.def.section->owner);
12691 log_file_align = bed->s->log_file_align;
12692 n = h->vtable->parent->vtable->size >> log_file_align;
12707 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12710 bfd_vma hstart, hend;
12711 Elf_Internal_Rela *relstart, *relend, *rel;
12712 const struct elf_backend_data *bed;
12713 unsigned int log_file_align;
12715 /* Take care of both those symbols that do not describe vtables as
12716 well as those that are not loaded. */
12717 if (h->vtable == NULL || h->vtable->parent == NULL)
12720 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12721 || h->root.type == bfd_link_hash_defweak);
12723 sec = h->root.u.def.section;
12724 hstart = h->root.u.def.value;
12725 hend = hstart + h->size;
12727 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12729 return *(bfd_boolean *) okp = FALSE;
12730 bed = get_elf_backend_data (sec->owner);
12731 log_file_align = bed->s->log_file_align;
12733 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12735 for (rel = relstart; rel < relend; ++rel)
12736 if (rel->r_offset >= hstart && rel->r_offset < hend)
12738 /* If the entry is in use, do nothing. */
12739 if (h->vtable->used
12740 && (rel->r_offset - hstart) < h->vtable->size)
12742 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12743 if (h->vtable->used[entry])
12746 /* Otherwise, kill it. */
12747 rel->r_offset = rel->r_info = rel->r_addend = 0;
12753 /* Mark sections containing dynamically referenced symbols. When
12754 building shared libraries, we must assume that any visible symbol is
12758 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12760 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12761 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12763 if ((h->root.type == bfd_link_hash_defined
12764 || h->root.type == bfd_link_hash_defweak)
12766 || ((h->def_regular || ELF_COMMON_DEF_P (h))
12767 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12768 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12769 && (!bfd_link_executable (info)
12770 || info->export_dynamic
12773 && (*d->match) (&d->head, NULL, h->root.root.string)))
12774 && (h->versioned >= versioned
12775 || !bfd_hide_sym_by_version (info->version_info,
12776 h->root.root.string)))))
12777 h->root.u.def.section->flags |= SEC_KEEP;
12782 /* Keep all sections containing symbols undefined on the command-line,
12783 and the section containing the entry symbol. */
12786 _bfd_elf_gc_keep (struct bfd_link_info *info)
12788 struct bfd_sym_chain *sym;
12790 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12792 struct elf_link_hash_entry *h;
12794 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12795 FALSE, FALSE, FALSE);
12798 && (h->root.type == bfd_link_hash_defined
12799 || h->root.type == bfd_link_hash_defweak)
12800 && !bfd_is_abs_section (h->root.u.def.section))
12801 h->root.u.def.section->flags |= SEC_KEEP;
12806 bfd_elf_parse_eh_frame_entries (bfd *abfd ATTRIBUTE_UNUSED,
12807 struct bfd_link_info *info)
12809 bfd *ibfd = info->input_bfds;
12811 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12814 struct elf_reloc_cookie cookie;
12816 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12819 if (!init_reloc_cookie (&cookie, info, ibfd))
12822 for (sec = ibfd->sections; sec; sec = sec->next)
12824 if (CONST_STRNEQ (bfd_section_name (ibfd, sec), ".eh_frame_entry")
12825 && init_reloc_cookie_rels (&cookie, info, ibfd, sec))
12827 _bfd_elf_parse_eh_frame_entry (info, sec, &cookie);
12828 fini_reloc_cookie_rels (&cookie, sec);
12835 /* Do mark and sweep of unused sections. */
12838 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12840 bfd_boolean ok = TRUE;
12842 elf_gc_mark_hook_fn gc_mark_hook;
12843 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12844 struct elf_link_hash_table *htab;
12846 if (!bed->can_gc_sections
12847 || !is_elf_hash_table (info->hash))
12849 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12853 bed->gc_keep (info);
12854 htab = elf_hash_table (info);
12856 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12857 at the .eh_frame section if we can mark the FDEs individually. */
12858 for (sub = info->input_bfds;
12859 info->eh_frame_hdr_type != COMPACT_EH_HDR && sub != NULL;
12860 sub = sub->link.next)
12863 struct elf_reloc_cookie cookie;
12865 sec = bfd_get_section_by_name (sub, ".eh_frame");
12866 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12868 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12869 if (elf_section_data (sec)->sec_info
12870 && (sec->flags & SEC_LINKER_CREATED) == 0)
12871 elf_eh_frame_section (sub) = sec;
12872 fini_reloc_cookie_for_section (&cookie, sec);
12873 sec = bfd_get_next_section_by_name (NULL, sec);
12877 /* Apply transitive closure to the vtable entry usage info. */
12878 elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
12882 /* Kill the vtable relocations that were not used. */
12883 elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
12887 /* Mark dynamically referenced symbols. */
12888 if (htab->dynamic_sections_created)
12889 elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
12891 /* Grovel through relocs to find out who stays ... */
12892 gc_mark_hook = bed->gc_mark_hook;
12893 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12897 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12898 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12901 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12902 Also treat note sections as a root, if the section is not part
12904 for (o = sub->sections; o != NULL; o = o->next)
12906 && (o->flags & SEC_EXCLUDE) == 0
12907 && ((o->flags & SEC_KEEP) != 0
12908 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12909 && elf_next_in_group (o) == NULL )))
12911 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12916 /* Allow the backend to mark additional target specific sections. */
12917 bed->gc_mark_extra_sections (info, gc_mark_hook);
12919 /* ... and mark SEC_EXCLUDE for those that go. */
12920 return elf_gc_sweep (abfd, info);
12923 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12926 bfd_elf_gc_record_vtinherit (bfd *abfd,
12928 struct elf_link_hash_entry *h,
12931 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12932 struct elf_link_hash_entry **search, *child;
12933 bfd_size_type extsymcount;
12934 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12936 /* The sh_info field of the symtab header tells us where the
12937 external symbols start. We don't care about the local symbols at
12939 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12940 if (!elf_bad_symtab (abfd))
12941 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12943 sym_hashes = elf_sym_hashes (abfd);
12944 sym_hashes_end = sym_hashes + extsymcount;
12946 /* Hunt down the child symbol, which is in this section at the same
12947 offset as the relocation. */
12948 for (search = sym_hashes; search != sym_hashes_end; ++search)
12950 if ((child = *search) != NULL
12951 && (child->root.type == bfd_link_hash_defined
12952 || child->root.type == bfd_link_hash_defweak)
12953 && child->root.u.def.section == sec
12954 && child->root.u.def.value == offset)
12958 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12959 abfd, sec, (unsigned long) offset);
12960 bfd_set_error (bfd_error_invalid_operation);
12964 if (!child->vtable)
12966 child->vtable = ((struct elf_link_virtual_table_entry *)
12967 bfd_zalloc (abfd, sizeof (*child->vtable)));
12968 if (!child->vtable)
12973 /* This *should* only be the absolute section. It could potentially
12974 be that someone has defined a non-global vtable though, which
12975 would be bad. It isn't worth paging in the local symbols to be
12976 sure though; that case should simply be handled by the assembler. */
12978 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12981 child->vtable->parent = h;
12986 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12989 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12990 asection *sec ATTRIBUTE_UNUSED,
12991 struct elf_link_hash_entry *h,
12994 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12995 unsigned int log_file_align = bed->s->log_file_align;
12999 h->vtable = ((struct elf_link_virtual_table_entry *)
13000 bfd_zalloc (abfd, sizeof (*h->vtable)));
13005 if (addend >= h->vtable->size)
13007 size_t size, bytes, file_align;
13008 bfd_boolean *ptr = h->vtable->used;
13010 /* While the symbol is undefined, we have to be prepared to handle
13012 file_align = 1 << log_file_align;
13013 if (h->root.type == bfd_link_hash_undefined)
13014 size = addend + file_align;
13018 if (addend >= size)
13020 /* Oops! We've got a reference past the defined end of
13021 the table. This is probably a bug -- shall we warn? */
13022 size = addend + file_align;
13025 size = (size + file_align - 1) & -file_align;
13027 /* Allocate one extra entry for use as a "done" flag for the
13028 consolidation pass. */
13029 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
13033 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
13039 oldbytes = (((h->vtable->size >> log_file_align) + 1)
13040 * sizeof (bfd_boolean));
13041 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
13045 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
13050 /* And arrange for that done flag to be at index -1. */
13051 h->vtable->used = ptr + 1;
13052 h->vtable->size = size;
13055 h->vtable->used[addend >> log_file_align] = TRUE;
13060 /* Map an ELF section header flag to its corresponding string. */
13064 flagword flag_value;
13065 } elf_flags_to_name_table;
13067 static elf_flags_to_name_table elf_flags_to_names [] =
13069 { "SHF_WRITE", SHF_WRITE },
13070 { "SHF_ALLOC", SHF_ALLOC },
13071 { "SHF_EXECINSTR", SHF_EXECINSTR },
13072 { "SHF_MERGE", SHF_MERGE },
13073 { "SHF_STRINGS", SHF_STRINGS },
13074 { "SHF_INFO_LINK", SHF_INFO_LINK},
13075 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
13076 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
13077 { "SHF_GROUP", SHF_GROUP },
13078 { "SHF_TLS", SHF_TLS },
13079 { "SHF_MASKOS", SHF_MASKOS },
13080 { "SHF_EXCLUDE", SHF_EXCLUDE },
13083 /* Returns TRUE if the section is to be included, otherwise FALSE. */
13085 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
13086 struct flag_info *flaginfo,
13089 const bfd_vma sh_flags = elf_section_flags (section);
13091 if (!flaginfo->flags_initialized)
13093 bfd *obfd = info->output_bfd;
13094 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13095 struct flag_info_list *tf = flaginfo->flag_list;
13097 int without_hex = 0;
13099 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
13102 flagword (*lookup) (char *);
13104 lookup = bed->elf_backend_lookup_section_flags_hook;
13105 if (lookup != NULL)
13107 flagword hexval = (*lookup) ((char *) tf->name);
13111 if (tf->with == with_flags)
13112 with_hex |= hexval;
13113 else if (tf->with == without_flags)
13114 without_hex |= hexval;
13119 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
13121 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
13123 if (tf->with == with_flags)
13124 with_hex |= elf_flags_to_names[i].flag_value;
13125 else if (tf->with == without_flags)
13126 without_hex |= elf_flags_to_names[i].flag_value;
13133 info->callbacks->einfo
13134 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
13138 flaginfo->flags_initialized = TRUE;
13139 flaginfo->only_with_flags |= with_hex;
13140 flaginfo->not_with_flags |= without_hex;
13143 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
13146 if ((flaginfo->not_with_flags & sh_flags) != 0)
13152 struct alloc_got_off_arg {
13154 struct bfd_link_info *info;
13157 /* We need a special top-level link routine to convert got reference counts
13158 to real got offsets. */
13161 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
13163 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
13164 bfd *obfd = gofarg->info->output_bfd;
13165 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13167 if (h->got.refcount > 0)
13169 h->got.offset = gofarg->gotoff;
13170 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
13173 h->got.offset = (bfd_vma) -1;
13178 /* And an accompanying bit to work out final got entry offsets once
13179 we're done. Should be called from final_link. */
13182 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
13183 struct bfd_link_info *info)
13186 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13188 struct alloc_got_off_arg gofarg;
13190 BFD_ASSERT (abfd == info->output_bfd);
13192 if (! is_elf_hash_table (info->hash))
13195 /* The GOT offset is relative to the .got section, but the GOT header is
13196 put into the .got.plt section, if the backend uses it. */
13197 if (bed->want_got_plt)
13200 gotoff = bed->got_header_size;
13202 /* Do the local .got entries first. */
13203 for (i = info->input_bfds; i; i = i->link.next)
13205 bfd_signed_vma *local_got;
13206 bfd_size_type j, locsymcount;
13207 Elf_Internal_Shdr *symtab_hdr;
13209 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
13212 local_got = elf_local_got_refcounts (i);
13216 symtab_hdr = &elf_tdata (i)->symtab_hdr;
13217 if (elf_bad_symtab (i))
13218 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
13220 locsymcount = symtab_hdr->sh_info;
13222 for (j = 0; j < locsymcount; ++j)
13224 if (local_got[j] > 0)
13226 local_got[j] = gotoff;
13227 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
13230 local_got[j] = (bfd_vma) -1;
13234 /* Then the global .got entries. .plt refcounts are handled by
13235 adjust_dynamic_symbol */
13236 gofarg.gotoff = gotoff;
13237 gofarg.info = info;
13238 elf_link_hash_traverse (elf_hash_table (info),
13239 elf_gc_allocate_got_offsets,
13244 /* Many folk need no more in the way of final link than this, once
13245 got entry reference counting is enabled. */
13248 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
13250 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
13253 /* Invoke the regular ELF backend linker to do all the work. */
13254 return bfd_elf_final_link (abfd, info);
13258 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
13260 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
13262 if (rcookie->bad_symtab)
13263 rcookie->rel = rcookie->rels;
13265 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
13267 unsigned long r_symndx;
13269 if (! rcookie->bad_symtab)
13270 if (rcookie->rel->r_offset > offset)
13272 if (rcookie->rel->r_offset != offset)
13275 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
13276 if (r_symndx == STN_UNDEF)
13279 if (r_symndx >= rcookie->locsymcount
13280 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
13282 struct elf_link_hash_entry *h;
13284 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
13286 while (h->root.type == bfd_link_hash_indirect
13287 || h->root.type == bfd_link_hash_warning)
13288 h = (struct elf_link_hash_entry *) h->root.u.i.link;
13290 if ((h->root.type == bfd_link_hash_defined
13291 || h->root.type == bfd_link_hash_defweak)
13292 && (h->root.u.def.section->owner != rcookie->abfd
13293 || h->root.u.def.section->kept_section != NULL
13294 || discarded_section (h->root.u.def.section)))
13299 /* It's not a relocation against a global symbol,
13300 but it could be a relocation against a local
13301 symbol for a discarded section. */
13303 Elf_Internal_Sym *isym;
13305 /* Need to: get the symbol; get the section. */
13306 isym = &rcookie->locsyms[r_symndx];
13307 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
13309 && (isec->kept_section != NULL
13310 || discarded_section (isec)))
13318 /* Discard unneeded references to discarded sections.
13319 Returns -1 on error, 1 if any section's size was changed, 0 if
13320 nothing changed. This function assumes that the relocations are in
13321 sorted order, which is true for all known assemblers. */
13324 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
13326 struct elf_reloc_cookie cookie;
13331 if (info->traditional_format
13332 || !is_elf_hash_table (info->hash))
13335 o = bfd_get_section_by_name (output_bfd, ".stab");
13340 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
13343 || i->reloc_count == 0
13344 || i->sec_info_type != SEC_INFO_TYPE_STABS)
13348 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13351 if (!init_reloc_cookie_for_section (&cookie, info, i))
13354 if (_bfd_discard_section_stabs (abfd, i,
13355 elf_section_data (i)->sec_info,
13356 bfd_elf_reloc_symbol_deleted_p,
13360 fini_reloc_cookie_for_section (&cookie, i);
13365 if (info->eh_frame_hdr_type != COMPACT_EH_HDR)
13366 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
13371 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
13377 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13380 if (!init_reloc_cookie_for_section (&cookie, info, i))
13383 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
13384 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
13385 bfd_elf_reloc_symbol_deleted_p,
13389 fini_reloc_cookie_for_section (&cookie, i);
13393 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
13395 const struct elf_backend_data *bed;
13397 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13400 bed = get_elf_backend_data (abfd);
13402 if (bed->elf_backend_discard_info != NULL)
13404 if (!init_reloc_cookie (&cookie, info, abfd))
13407 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
13410 fini_reloc_cookie (&cookie, abfd);
13414 if (info->eh_frame_hdr_type == COMPACT_EH_HDR)
13415 _bfd_elf_end_eh_frame_parsing (info);
13417 if (info->eh_frame_hdr_type
13418 && !bfd_link_relocatable (info)
13419 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
13426 _bfd_elf_section_already_linked (bfd *abfd,
13428 struct bfd_link_info *info)
13431 const char *name, *key;
13432 struct bfd_section_already_linked *l;
13433 struct bfd_section_already_linked_hash_entry *already_linked_list;
13435 if (sec->output_section == bfd_abs_section_ptr)
13438 flags = sec->flags;
13440 /* Return if it isn't a linkonce section. A comdat group section
13441 also has SEC_LINK_ONCE set. */
13442 if ((flags & SEC_LINK_ONCE) == 0)
13445 /* Don't put group member sections on our list of already linked
13446 sections. They are handled as a group via their group section. */
13447 if (elf_sec_group (sec) != NULL)
13450 /* For a SHT_GROUP section, use the group signature as the key. */
13452 if ((flags & SEC_GROUP) != 0
13453 && elf_next_in_group (sec) != NULL
13454 && elf_group_name (elf_next_in_group (sec)) != NULL)
13455 key = elf_group_name (elf_next_in_group (sec));
13458 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
13459 if (CONST_STRNEQ (name, ".gnu.linkonce.")
13460 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
13463 /* Must be a user linkonce section that doesn't follow gcc's
13464 naming convention. In this case we won't be matching
13465 single member groups. */
13469 already_linked_list = bfd_section_already_linked_table_lookup (key);
13471 for (l = already_linked_list->entry; l != NULL; l = l->next)
13473 /* We may have 2 different types of sections on the list: group
13474 sections with a signature of <key> (<key> is some string),
13475 and linkonce sections named .gnu.linkonce.<type>.<key>.
13476 Match like sections. LTO plugin sections are an exception.
13477 They are always named .gnu.linkonce.t.<key> and match either
13478 type of section. */
13479 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
13480 && ((flags & SEC_GROUP) != 0
13481 || strcmp (name, l->sec->name) == 0))
13482 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
13484 /* The section has already been linked. See if we should
13485 issue a warning. */
13486 if (!_bfd_handle_already_linked (sec, l, info))
13489 if (flags & SEC_GROUP)
13491 asection *first = elf_next_in_group (sec);
13492 asection *s = first;
13496 s->output_section = bfd_abs_section_ptr;
13497 /* Record which group discards it. */
13498 s->kept_section = l->sec;
13499 s = elf_next_in_group (s);
13500 /* These lists are circular. */
13510 /* A single member comdat group section may be discarded by a
13511 linkonce section and vice versa. */
13512 if ((flags & SEC_GROUP) != 0)
13514 asection *first = elf_next_in_group (sec);
13516 if (first != NULL && elf_next_in_group (first) == first)
13517 /* Check this single member group against linkonce sections. */
13518 for (l = already_linked_list->entry; l != NULL; l = l->next)
13519 if ((l->sec->flags & SEC_GROUP) == 0
13520 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
13522 first->output_section = bfd_abs_section_ptr;
13523 first->kept_section = l->sec;
13524 sec->output_section = bfd_abs_section_ptr;
13529 /* Check this linkonce section against single member groups. */
13530 for (l = already_linked_list->entry; l != NULL; l = l->next)
13531 if (l->sec->flags & SEC_GROUP)
13533 asection *first = elf_next_in_group (l->sec);
13536 && elf_next_in_group (first) == first
13537 && bfd_elf_match_symbols_in_sections (first, sec, info))
13539 sec->output_section = bfd_abs_section_ptr;
13540 sec->kept_section = first;
13545 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
13546 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
13547 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
13548 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
13549 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
13550 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
13551 `.gnu.linkonce.t.F' section from a different bfd not requiring any
13552 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
13553 The reverse order cannot happen as there is never a bfd with only the
13554 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
13555 matter as here were are looking only for cross-bfd sections. */
13557 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
13558 for (l = already_linked_list->entry; l != NULL; l = l->next)
13559 if ((l->sec->flags & SEC_GROUP) == 0
13560 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
13562 if (abfd != l->sec->owner)
13563 sec->output_section = bfd_abs_section_ptr;
13567 /* This is the first section with this name. Record it. */
13568 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
13569 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
13570 return sec->output_section == bfd_abs_section_ptr;
13574 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
13576 return sym->st_shndx == SHN_COMMON;
13580 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
13586 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
13588 return bfd_com_section_ptr;
13592 _bfd_elf_default_got_elt_size (bfd *abfd,
13593 struct bfd_link_info *info ATTRIBUTE_UNUSED,
13594 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
13595 bfd *ibfd ATTRIBUTE_UNUSED,
13596 unsigned long symndx ATTRIBUTE_UNUSED)
13598 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13599 return bed->s->arch_size / 8;
13602 /* Routines to support the creation of dynamic relocs. */
13604 /* Returns the name of the dynamic reloc section associated with SEC. */
13606 static const char *
13607 get_dynamic_reloc_section_name (bfd * abfd,
13609 bfd_boolean is_rela)
13612 const char *old_name = bfd_get_section_name (NULL, sec);
13613 const char *prefix = is_rela ? ".rela" : ".rel";
13615 if (old_name == NULL)
13618 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
13619 sprintf (name, "%s%s", prefix, old_name);
13624 /* Returns the dynamic reloc section associated with SEC.
13625 If necessary compute the name of the dynamic reloc section based
13626 on SEC's name (looked up in ABFD's string table) and the setting
13630 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
13632 bfd_boolean is_rela)
13634 asection * reloc_sec = elf_section_data (sec)->sreloc;
13636 if (reloc_sec == NULL)
13638 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13642 reloc_sec = bfd_get_linker_section (abfd, name);
13644 if (reloc_sec != NULL)
13645 elf_section_data (sec)->sreloc = reloc_sec;
13652 /* Returns the dynamic reloc section associated with SEC. If the
13653 section does not exist it is created and attached to the DYNOBJ
13654 bfd and stored in the SRELOC field of SEC's elf_section_data
13657 ALIGNMENT is the alignment for the newly created section and
13658 IS_RELA defines whether the name should be .rela.<SEC's name>
13659 or .rel.<SEC's name>. The section name is looked up in the
13660 string table associated with ABFD. */
13663 _bfd_elf_make_dynamic_reloc_section (asection *sec,
13665 unsigned int alignment,
13667 bfd_boolean is_rela)
13669 asection * reloc_sec = elf_section_data (sec)->sreloc;
13671 if (reloc_sec == NULL)
13673 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13678 reloc_sec = bfd_get_linker_section (dynobj, name);
13680 if (reloc_sec == NULL)
13682 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
13683 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
13684 if ((sec->flags & SEC_ALLOC) != 0)
13685 flags |= SEC_ALLOC | SEC_LOAD;
13687 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13688 if (reloc_sec != NULL)
13690 /* _bfd_elf_get_sec_type_attr chooses a section type by
13691 name. Override as it may be wrong, eg. for a user
13692 section named "auto" we'll get ".relauto" which is
13693 seen to be a .rela section. */
13694 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13695 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13700 elf_section_data (sec)->sreloc = reloc_sec;
13706 /* Copy the ELF symbol type and other attributes for a linker script
13707 assignment from HSRC to HDEST. Generally this should be treated as
13708 if we found a strong non-dynamic definition for HDEST (except that
13709 ld ignores multiple definition errors). */
13711 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13712 struct bfd_link_hash_entry *hdest,
13713 struct bfd_link_hash_entry *hsrc)
13715 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13716 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13717 Elf_Internal_Sym isym;
13719 ehdest->type = ehsrc->type;
13720 ehdest->target_internal = ehsrc->target_internal;
13722 isym.st_other = ehsrc->other;
13723 elf_merge_st_other (abfd, ehdest, &isym, NULL, TRUE, FALSE);
13726 /* Append a RELA relocation REL to section S in BFD. */
13729 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13731 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13732 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13733 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13734 bed->s->swap_reloca_out (abfd, rel, loc);
13737 /* Append a REL relocation REL to section S in BFD. */
13740 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13742 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13743 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13744 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13745 bed->s->swap_reloc_out (abfd, rel, loc);