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
529 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
531 && h->root.type == bfd_link_hash_new
532 && (*d->match) (&d->head, NULL, h->root.root.string)))
536 /* Record an assignment to a symbol made by a linker script. We need
537 this in case some dynamic object refers to this symbol. */
540 bfd_elf_record_link_assignment (bfd *output_bfd,
541 struct bfd_link_info *info,
546 struct elf_link_hash_entry *h, *hv;
547 struct elf_link_hash_table *htab;
548 const struct elf_backend_data *bed;
550 if (!is_elf_hash_table (info->hash))
553 htab = elf_hash_table (info);
554 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
558 if (h->versioned == unknown)
560 /* Set versioned if symbol version is unknown. */
561 char *version = strrchr (name, ELF_VER_CHR);
564 if (version > name && version[-1] != ELF_VER_CHR)
565 h->versioned = versioned_hidden;
567 h->versioned = versioned;
571 switch (h->root.type)
573 case bfd_link_hash_defined:
574 case bfd_link_hash_defweak:
575 case bfd_link_hash_common:
577 case bfd_link_hash_undefweak:
578 case bfd_link_hash_undefined:
579 /* Since we're defining the symbol, don't let it seem to have not
580 been defined. record_dynamic_symbol and size_dynamic_sections
581 may depend on this. */
582 h->root.type = bfd_link_hash_new;
583 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
584 bfd_link_repair_undef_list (&htab->root);
586 case bfd_link_hash_new:
587 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
590 case bfd_link_hash_indirect:
591 /* We had a versioned symbol in a dynamic library. We make the
592 the versioned symbol point to this one. */
593 bed = get_elf_backend_data (output_bfd);
595 while (hv->root.type == bfd_link_hash_indirect
596 || hv->root.type == bfd_link_hash_warning)
597 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
598 /* We don't need to update h->root.u since linker will set them
600 h->root.type = bfd_link_hash_undefined;
601 hv->root.type = bfd_link_hash_indirect;
602 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
603 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
605 case bfd_link_hash_warning:
610 /* If this symbol is being provided by the linker script, and it is
611 currently defined by a dynamic object, but not by a regular
612 object, then mark it as undefined so that the generic linker will
613 force the correct value. */
617 h->root.type = bfd_link_hash_undefined;
619 /* If this symbol is not being provided by the linker script, and it is
620 currently defined by a dynamic object, but not by a regular object,
621 then clear out any version information because the symbol will not be
622 associated with the dynamic object any more. */
626 h->verinfo.verdef = NULL;
632 bed = get_elf_backend_data (output_bfd);
633 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
634 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
635 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
638 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
640 if (!bfd_link_relocatable (info)
642 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
643 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
648 || bfd_link_dll (info)
649 || elf_hash_table (info)->is_relocatable_executable)
652 if (! bfd_elf_link_record_dynamic_symbol (info, h))
655 /* If this is a weak defined symbol, and we know a corresponding
656 real symbol from the same dynamic object, make sure the real
657 symbol is also made into a dynamic symbol. */
658 if (h->u.weakdef != NULL
659 && h->u.weakdef->dynindx == -1)
661 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
669 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
670 success, and 2 on a failure caused by attempting to record a symbol
671 in a discarded section, eg. a discarded link-once section symbol. */
674 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
679 struct elf_link_local_dynamic_entry *entry;
680 struct elf_link_hash_table *eht;
681 struct elf_strtab_hash *dynstr;
682 unsigned long dynstr_index;
684 Elf_External_Sym_Shndx eshndx;
685 char esym[sizeof (Elf64_External_Sym)];
687 if (! is_elf_hash_table (info->hash))
690 /* See if the entry exists already. */
691 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
692 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
695 amt = sizeof (*entry);
696 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
700 /* Go find the symbol, so that we can find it's name. */
701 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
702 1, input_indx, &entry->isym, esym, &eshndx))
704 bfd_release (input_bfd, entry);
708 if (entry->isym.st_shndx != SHN_UNDEF
709 && entry->isym.st_shndx < SHN_LORESERVE)
713 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
714 if (s == NULL || bfd_is_abs_section (s->output_section))
716 /* We can still bfd_release here as nothing has done another
717 bfd_alloc. We can't do this later in this function. */
718 bfd_release (input_bfd, entry);
723 name = (bfd_elf_string_from_elf_section
724 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
725 entry->isym.st_name));
727 dynstr = elf_hash_table (info)->dynstr;
730 /* Create a strtab to hold the dynamic symbol names. */
731 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
736 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
737 if (dynstr_index == (unsigned long) -1)
739 entry->isym.st_name = dynstr_index;
741 eht = elf_hash_table (info);
743 entry->next = eht->dynlocal;
744 eht->dynlocal = entry;
745 entry->input_bfd = input_bfd;
746 entry->input_indx = input_indx;
749 /* Whatever binding the symbol had before, it's now local. */
751 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
753 /* The dynindx will be set at the end of size_dynamic_sections. */
758 /* Return the dynindex of a local dynamic symbol. */
761 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
765 struct elf_link_local_dynamic_entry *e;
767 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
768 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
773 /* This function is used to renumber the dynamic symbols, if some of
774 them are removed because they are marked as local. This is called
775 via elf_link_hash_traverse. */
778 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
781 size_t *count = (size_t *) data;
786 if (h->dynindx != -1)
787 h->dynindx = ++(*count);
793 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
794 STB_LOCAL binding. */
797 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
800 size_t *count = (size_t *) data;
802 if (!h->forced_local)
805 if (h->dynindx != -1)
806 h->dynindx = ++(*count);
811 /* Return true if the dynamic symbol for a given section should be
812 omitted when creating a shared library. */
814 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
815 struct bfd_link_info *info,
818 struct elf_link_hash_table *htab;
821 switch (elf_section_data (p)->this_hdr.sh_type)
825 /* If sh_type is yet undecided, assume it could be
826 SHT_PROGBITS/SHT_NOBITS. */
828 htab = elf_hash_table (info);
829 if (p == htab->tls_sec)
832 if (htab->text_index_section != NULL)
833 return p != htab->text_index_section && p != htab->data_index_section;
835 return (htab->dynobj != NULL
836 && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
837 && ip->output_section == p);
839 /* There shouldn't be section relative relocations
840 against any other section. */
846 /* Assign dynsym indices. In a shared library we generate a section
847 symbol for each output section, which come first. Next come symbols
848 which have been forced to local binding. Then all of the back-end
849 allocated local dynamic syms, followed by the rest of the global
853 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
854 struct bfd_link_info *info,
855 unsigned long *section_sym_count)
857 unsigned long dynsymcount = 0;
859 if (bfd_link_pic (info)
860 || elf_hash_table (info)->is_relocatable_executable)
862 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
864 for (p = output_bfd->sections; p ; p = p->next)
865 if ((p->flags & SEC_EXCLUDE) == 0
866 && (p->flags & SEC_ALLOC) != 0
867 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
868 elf_section_data (p)->dynindx = ++dynsymcount;
870 elf_section_data (p)->dynindx = 0;
872 *section_sym_count = dynsymcount;
874 elf_link_hash_traverse (elf_hash_table (info),
875 elf_link_renumber_local_hash_table_dynsyms,
878 if (elf_hash_table (info)->dynlocal)
880 struct elf_link_local_dynamic_entry *p;
881 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
882 p->dynindx = ++dynsymcount;
885 elf_link_hash_traverse (elf_hash_table (info),
886 elf_link_renumber_hash_table_dynsyms,
889 /* There is an unused NULL entry at the head of the table which
890 we must account for in our count. We always create the dynsym
891 section, even if it is empty, with dynamic sections. */
892 if (elf_hash_table (info)->dynamic_sections_created)
895 elf_hash_table (info)->dynsymcount = dynsymcount;
899 /* Merge st_other field. */
902 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
903 const Elf_Internal_Sym *isym, asection *sec,
904 bfd_boolean definition, bfd_boolean dynamic)
906 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
908 /* If st_other has a processor-specific meaning, specific
909 code might be needed here. */
910 if (bed->elf_backend_merge_symbol_attribute)
911 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
916 unsigned symvis = ELF_ST_VISIBILITY (isym->st_other);
917 unsigned hvis = ELF_ST_VISIBILITY (h->other);
919 /* Keep the most constraining visibility. Leave the remainder
920 of the st_other field to elf_backend_merge_symbol_attribute. */
921 if (symvis - 1 < hvis - 1)
922 h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
925 && ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT
926 && (sec->flags & SEC_READONLY) == 0)
927 h->protected_def = 1;
930 /* This function is called when we want to merge a new symbol with an
931 existing symbol. It handles the various cases which arise when we
932 find a definition in a dynamic object, or when there is already a
933 definition in a dynamic object. The new symbol is described by
934 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
935 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
936 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
937 of an old common symbol. We set OVERRIDE if the old symbol is
938 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
939 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
940 to change. By OK to change, we mean that we shouldn't warn if the
941 type or size does change. */
944 _bfd_elf_merge_symbol (bfd *abfd,
945 struct bfd_link_info *info,
947 Elf_Internal_Sym *sym,
950 struct elf_link_hash_entry **sym_hash,
952 bfd_boolean *pold_weak,
953 unsigned int *pold_alignment,
955 bfd_boolean *override,
956 bfd_boolean *type_change_ok,
957 bfd_boolean *size_change_ok,
958 bfd_boolean *matched)
960 asection *sec, *oldsec;
961 struct elf_link_hash_entry *h;
962 struct elf_link_hash_entry *hi;
963 struct elf_link_hash_entry *flip;
966 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
967 bfd_boolean newweak, oldweak, newfunc, oldfunc;
968 const struct elf_backend_data *bed;
975 bind = ELF_ST_BIND (sym->st_info);
977 if (! bfd_is_und_section (sec))
978 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
980 h = ((struct elf_link_hash_entry *)
981 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
986 bed = get_elf_backend_data (abfd);
988 /* NEW_VERSION is the symbol version of the new symbol. */
989 if (h->versioned != unversioned)
991 /* Symbol version is unknown or versioned. */
992 new_version = strrchr (name, ELF_VER_CHR);
995 if (h->versioned == unknown)
997 if (new_version > name && new_version[-1] != ELF_VER_CHR)
998 h->versioned = versioned_hidden;
1000 h->versioned = versioned;
1003 if (new_version[0] == '\0')
1007 h->versioned = unversioned;
1012 /* For merging, we only care about real symbols. But we need to make
1013 sure that indirect symbol dynamic flags are updated. */
1015 while (h->root.type == bfd_link_hash_indirect
1016 || h->root.type == bfd_link_hash_warning)
1017 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1021 if (hi == h || h->root.type == bfd_link_hash_new)
1025 /* OLD_HIDDEN is true if the existing symbol is only visible
1026 to the symbol with the same symbol version. NEW_HIDDEN is
1027 true if the new symbol is only visible to the symbol with
1028 the same symbol version. */
1029 bfd_boolean old_hidden = h->versioned == versioned_hidden;
1030 bfd_boolean new_hidden = hi->versioned == versioned_hidden;
1031 if (!old_hidden && !new_hidden)
1032 /* The new symbol matches the existing symbol if both
1037 /* OLD_VERSION is the symbol version of the existing
1041 if (h->versioned >= versioned)
1042 old_version = strrchr (h->root.root.string,
1047 /* The new symbol matches the existing symbol if they
1048 have the same symbol version. */
1049 *matched = (old_version == new_version
1050 || (old_version != NULL
1051 && new_version != NULL
1052 && strcmp (old_version, new_version) == 0));
1057 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1062 switch (h->root.type)
1067 case bfd_link_hash_undefined:
1068 case bfd_link_hash_undefweak:
1069 oldbfd = h->root.u.undef.abfd;
1072 case bfd_link_hash_defined:
1073 case bfd_link_hash_defweak:
1074 oldbfd = h->root.u.def.section->owner;
1075 oldsec = h->root.u.def.section;
1078 case bfd_link_hash_common:
1079 oldbfd = h->root.u.c.p->section->owner;
1080 oldsec = h->root.u.c.p->section;
1082 *pold_alignment = h->root.u.c.p->alignment_power;
1085 if (poldbfd && *poldbfd == NULL)
1088 /* Differentiate strong and weak symbols. */
1089 newweak = bind == STB_WEAK;
1090 oldweak = (h->root.type == bfd_link_hash_defweak
1091 || h->root.type == bfd_link_hash_undefweak);
1093 *pold_weak = oldweak;
1095 /* This code is for coping with dynamic objects, and is only useful
1096 if we are doing an ELF link. */
1097 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
1100 /* We have to check it for every instance since the first few may be
1101 references and not all compilers emit symbol type for undefined
1103 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
1105 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1106 respectively, is from a dynamic object. */
1108 newdyn = (abfd->flags & DYNAMIC) != 0;
1110 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1111 syms and defined syms in dynamic libraries respectively.
1112 ref_dynamic on the other hand can be set for a symbol defined in
1113 a dynamic library, and def_dynamic may not be set; When the
1114 definition in a dynamic lib is overridden by a definition in the
1115 executable use of the symbol in the dynamic lib becomes a
1116 reference to the executable symbol. */
1119 if (bfd_is_und_section (sec))
1121 if (bind != STB_WEAK)
1123 h->ref_dynamic_nonweak = 1;
1124 hi->ref_dynamic_nonweak = 1;
1129 /* Update the existing symbol only if they match. */
1132 hi->dynamic_def = 1;
1136 /* If we just created the symbol, mark it as being an ELF symbol.
1137 Other than that, there is nothing to do--there is no merge issue
1138 with a newly defined symbol--so we just return. */
1140 if (h->root.type == bfd_link_hash_new)
1146 /* In cases involving weak versioned symbols, we may wind up trying
1147 to merge a symbol with itself. Catch that here, to avoid the
1148 confusion that results if we try to override a symbol with
1149 itself. The additional tests catch cases like
1150 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1151 dynamic object, which we do want to handle here. */
1153 && (newweak || oldweak)
1154 && ((abfd->flags & DYNAMIC) == 0
1155 || !h->def_regular))
1160 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1161 else if (oldsec != NULL)
1163 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1164 indices used by MIPS ELF. */
1165 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1168 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1169 respectively, appear to be a definition rather than reference. */
1171 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1173 olddef = (h->root.type != bfd_link_hash_undefined
1174 && h->root.type != bfd_link_hash_undefweak
1175 && h->root.type != bfd_link_hash_common);
1177 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1178 respectively, appear to be a function. */
1180 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1181 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1183 oldfunc = (h->type != STT_NOTYPE
1184 && bed->is_function_type (h->type));
1186 /* When we try to create a default indirect symbol from the dynamic
1187 definition with the default version, we skip it if its type and
1188 the type of existing regular definition mismatch. */
1189 if (pold_alignment == NULL
1193 && (((olddef || h->root.type == bfd_link_hash_common)
1194 && ELF_ST_TYPE (sym->st_info) != h->type
1195 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1196 && h->type != STT_NOTYPE
1197 && !(newfunc && oldfunc))
1199 && ((h->type == STT_GNU_IFUNC)
1200 != (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)))))
1206 /* Check TLS symbols. We don't check undefined symbols introduced
1207 by "ld -u" which have no type (and oldbfd NULL), and we don't
1208 check symbols from plugins because they also have no type. */
1210 && (oldbfd->flags & BFD_PLUGIN) == 0
1211 && (abfd->flags & BFD_PLUGIN) == 0
1212 && ELF_ST_TYPE (sym->st_info) != h->type
1213 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1216 bfd_boolean ntdef, tdef;
1217 asection *ntsec, *tsec;
1219 if (h->type == STT_TLS)
1239 (*_bfd_error_handler)
1240 (_("%s: TLS definition in %B section %A "
1241 "mismatches non-TLS definition in %B section %A"),
1242 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1243 else if (!tdef && !ntdef)
1244 (*_bfd_error_handler)
1245 (_("%s: TLS reference in %B "
1246 "mismatches non-TLS reference in %B"),
1247 tbfd, ntbfd, h->root.root.string);
1249 (*_bfd_error_handler)
1250 (_("%s: TLS definition in %B section %A "
1251 "mismatches non-TLS reference in %B"),
1252 tbfd, tsec, ntbfd, h->root.root.string);
1254 (*_bfd_error_handler)
1255 (_("%s: TLS reference in %B "
1256 "mismatches non-TLS definition in %B section %A"),
1257 tbfd, ntbfd, ntsec, h->root.root.string);
1259 bfd_set_error (bfd_error_bad_value);
1263 /* If the old symbol has non-default visibility, we ignore the new
1264 definition from a dynamic object. */
1266 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1267 && !bfd_is_und_section (sec))
1270 /* Make sure this symbol is dynamic. */
1272 hi->ref_dynamic = 1;
1273 /* A protected symbol has external availability. Make sure it is
1274 recorded as dynamic.
1276 FIXME: Should we check type and size for protected symbol? */
1277 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1278 return bfd_elf_link_record_dynamic_symbol (info, h);
1283 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1286 /* If the new symbol with non-default visibility comes from a
1287 relocatable file and the old definition comes from a dynamic
1288 object, we remove the old definition. */
1289 if (hi->root.type == bfd_link_hash_indirect)
1291 /* Handle the case where the old dynamic definition is
1292 default versioned. We need to copy the symbol info from
1293 the symbol with default version to the normal one if it
1294 was referenced before. */
1297 hi->root.type = h->root.type;
1298 h->root.type = bfd_link_hash_indirect;
1299 (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
1301 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1302 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1304 /* If the new symbol is hidden or internal, completely undo
1305 any dynamic link state. */
1306 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1307 h->forced_local = 0;
1314 /* FIXME: Should we check type and size for protected symbol? */
1324 /* If the old symbol was undefined before, then it will still be
1325 on the undefs list. If the new symbol is undefined or
1326 common, we can't make it bfd_link_hash_new here, because new
1327 undefined or common symbols will be added to the undefs list
1328 by _bfd_generic_link_add_one_symbol. Symbols may not be
1329 added twice to the undefs list. Also, if the new symbol is
1330 undefweak then we don't want to lose the strong undef. */
1331 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1333 h->root.type = bfd_link_hash_undefined;
1334 h->root.u.undef.abfd = abfd;
1338 h->root.type = bfd_link_hash_new;
1339 h->root.u.undef.abfd = NULL;
1342 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1344 /* If the new symbol is hidden or internal, completely undo
1345 any dynamic link state. */
1346 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1347 h->forced_local = 0;
1353 /* FIXME: Should we check type and size for protected symbol? */
1359 /* If a new weak symbol definition comes from a regular file and the
1360 old symbol comes from a dynamic library, we treat the new one as
1361 strong. Similarly, an old weak symbol definition from a regular
1362 file is treated as strong when the new symbol comes from a dynamic
1363 library. Further, an old weak symbol from a dynamic library is
1364 treated as strong if the new symbol is from a dynamic library.
1365 This reflects the way glibc's ld.so works.
1367 Do this before setting *type_change_ok or *size_change_ok so that
1368 we warn properly when dynamic library symbols are overridden. */
1370 if (newdef && !newdyn && olddyn)
1372 if (olddef && newdyn)
1375 /* Allow changes between different types of function symbol. */
1376 if (newfunc && oldfunc)
1377 *type_change_ok = TRUE;
1379 /* It's OK to change the type if either the existing symbol or the
1380 new symbol is weak. A type change is also OK if the old symbol
1381 is undefined and the new symbol is defined. */
1386 && h->root.type == bfd_link_hash_undefined))
1387 *type_change_ok = TRUE;
1389 /* It's OK to change the size if either the existing symbol or the
1390 new symbol is weak, or if the old symbol is undefined. */
1393 || h->root.type == bfd_link_hash_undefined)
1394 *size_change_ok = TRUE;
1396 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1397 symbol, respectively, appears to be a common symbol in a dynamic
1398 object. If a symbol appears in an uninitialized section, and is
1399 not weak, and is not a function, then it may be a common symbol
1400 which was resolved when the dynamic object was created. We want
1401 to treat such symbols specially, because they raise special
1402 considerations when setting the symbol size: if the symbol
1403 appears as a common symbol in a regular object, and the size in
1404 the regular object is larger, we must make sure that we use the
1405 larger size. This problematic case can always be avoided in C,
1406 but it must be handled correctly when using Fortran shared
1409 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1410 likewise for OLDDYNCOMMON and OLDDEF.
1412 Note that this test is just a heuristic, and that it is quite
1413 possible to have an uninitialized symbol in a shared object which
1414 is really a definition, rather than a common symbol. This could
1415 lead to some minor confusion when the symbol really is a common
1416 symbol in some regular object. However, I think it will be
1422 && (sec->flags & SEC_ALLOC) != 0
1423 && (sec->flags & SEC_LOAD) == 0
1426 newdyncommon = TRUE;
1428 newdyncommon = FALSE;
1432 && h->root.type == bfd_link_hash_defined
1434 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1435 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1438 olddyncommon = TRUE;
1440 olddyncommon = FALSE;
1442 /* We now know everything about the old and new symbols. We ask the
1443 backend to check if we can merge them. */
1444 if (bed->merge_symbol != NULL)
1446 if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
1451 /* If both the old and the new symbols look like common symbols in a
1452 dynamic object, set the size of the symbol to the larger of the
1457 && sym->st_size != h->size)
1459 /* Since we think we have two common symbols, issue a multiple
1460 common warning if desired. Note that we only warn if the
1461 size is different. If the size is the same, we simply let
1462 the old symbol override the new one as normally happens with
1463 symbols defined in dynamic objects. */
1465 if (! ((*info->callbacks->multiple_common)
1466 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1469 if (sym->st_size > h->size)
1470 h->size = sym->st_size;
1472 *size_change_ok = TRUE;
1475 /* If we are looking at a dynamic object, and we have found a
1476 definition, we need to see if the symbol was already defined by
1477 some other object. If so, we want to use the existing
1478 definition, and we do not want to report a multiple symbol
1479 definition error; we do this by clobbering *PSEC to be
1480 bfd_und_section_ptr.
1482 We treat a common symbol as a definition if the symbol in the
1483 shared library is a function, since common symbols always
1484 represent variables; this can cause confusion in principle, but
1485 any such confusion would seem to indicate an erroneous program or
1486 shared library. We also permit a common symbol in a regular
1487 object to override a weak symbol in a shared object. */
1492 || (h->root.type == bfd_link_hash_common
1493 && (newweak || newfunc))))
1497 newdyncommon = FALSE;
1499 *psec = sec = bfd_und_section_ptr;
1500 *size_change_ok = TRUE;
1502 /* If we get here when the old symbol is a common symbol, then
1503 we are explicitly letting it override a weak symbol or
1504 function in a dynamic object, and we don't want to warn about
1505 a type change. If the old symbol is a defined symbol, a type
1506 change warning may still be appropriate. */
1508 if (h->root.type == bfd_link_hash_common)
1509 *type_change_ok = TRUE;
1512 /* Handle the special case of an old common symbol merging with a
1513 new symbol which looks like a common symbol in a shared object.
1514 We change *PSEC and *PVALUE to make the new symbol look like a
1515 common symbol, and let _bfd_generic_link_add_one_symbol do the
1519 && h->root.type == bfd_link_hash_common)
1523 newdyncommon = FALSE;
1524 *pvalue = sym->st_size;
1525 *psec = sec = bed->common_section (oldsec);
1526 *size_change_ok = TRUE;
1529 /* Skip weak definitions of symbols that are already defined. */
1530 if (newdef && olddef && newweak)
1532 /* Don't skip new non-IR weak syms. */
1533 if (!(oldbfd != NULL
1534 && (oldbfd->flags & BFD_PLUGIN) != 0
1535 && (abfd->flags & BFD_PLUGIN) == 0))
1541 /* Merge st_other. If the symbol already has a dynamic index,
1542 but visibility says it should not be visible, turn it into a
1544 elf_merge_st_other (abfd, h, sym, sec, newdef, newdyn);
1545 if (h->dynindx != -1)
1546 switch (ELF_ST_VISIBILITY (h->other))
1550 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1555 /* If the old symbol is from a dynamic object, and the new symbol is
1556 a definition which is not from a dynamic object, then the new
1557 symbol overrides the old symbol. Symbols from regular files
1558 always take precedence over symbols from dynamic objects, even if
1559 they are defined after the dynamic object in the link.
1561 As above, we again permit a common symbol in a regular object to
1562 override a definition in a shared object if the shared object
1563 symbol is a function or is weak. */
1568 || (bfd_is_com_section (sec)
1569 && (oldweak || oldfunc)))
1574 /* Change the hash table entry to undefined, and let
1575 _bfd_generic_link_add_one_symbol do the right thing with the
1578 h->root.type = bfd_link_hash_undefined;
1579 h->root.u.undef.abfd = h->root.u.def.section->owner;
1580 *size_change_ok = TRUE;
1583 olddyncommon = FALSE;
1585 /* We again permit a type change when a common symbol may be
1586 overriding a function. */
1588 if (bfd_is_com_section (sec))
1592 /* If a common symbol overrides a function, make sure
1593 that it isn't defined dynamically nor has type
1596 h->type = STT_NOTYPE;
1598 *type_change_ok = TRUE;
1601 if (hi->root.type == bfd_link_hash_indirect)
1604 /* This union may have been set to be non-NULL when this symbol
1605 was seen in a dynamic object. We must force the union to be
1606 NULL, so that it is correct for a regular symbol. */
1607 h->verinfo.vertree = NULL;
1610 /* Handle the special case of a new common symbol merging with an
1611 old symbol that looks like it might be a common symbol defined in
1612 a shared object. Note that we have already handled the case in
1613 which a new common symbol should simply override the definition
1614 in the shared library. */
1617 && bfd_is_com_section (sec)
1620 /* It would be best if we could set the hash table entry to a
1621 common symbol, but we don't know what to use for the section
1622 or the alignment. */
1623 if (! ((*info->callbacks->multiple_common)
1624 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1627 /* If the presumed common symbol in the dynamic object is
1628 larger, pretend that the new symbol has its size. */
1630 if (h->size > *pvalue)
1633 /* We need to remember the alignment required by the symbol
1634 in the dynamic object. */
1635 BFD_ASSERT (pold_alignment);
1636 *pold_alignment = h->root.u.def.section->alignment_power;
1639 olddyncommon = FALSE;
1641 h->root.type = bfd_link_hash_undefined;
1642 h->root.u.undef.abfd = h->root.u.def.section->owner;
1644 *size_change_ok = TRUE;
1645 *type_change_ok = TRUE;
1647 if (hi->root.type == bfd_link_hash_indirect)
1650 h->verinfo.vertree = NULL;
1655 /* Handle the case where we had a versioned symbol in a dynamic
1656 library and now find a definition in a normal object. In this
1657 case, we make the versioned symbol point to the normal one. */
1658 flip->root.type = h->root.type;
1659 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1660 h->root.type = bfd_link_hash_indirect;
1661 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1662 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1666 flip->ref_dynamic = 1;
1673 /* This function is called to create an indirect symbol from the
1674 default for the symbol with the default version if needed. The
1675 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1676 set DYNSYM if the new indirect symbol is dynamic. */
1679 _bfd_elf_add_default_symbol (bfd *abfd,
1680 struct bfd_link_info *info,
1681 struct elf_link_hash_entry *h,
1683 Elf_Internal_Sym *sym,
1687 bfd_boolean *dynsym)
1689 bfd_boolean type_change_ok;
1690 bfd_boolean size_change_ok;
1693 struct elf_link_hash_entry *hi;
1694 struct bfd_link_hash_entry *bh;
1695 const struct elf_backend_data *bed;
1696 bfd_boolean collect;
1697 bfd_boolean dynamic;
1698 bfd_boolean override;
1700 size_t len, shortlen;
1702 bfd_boolean matched;
1704 if (h->versioned == unversioned || h->versioned == versioned_hidden)
1707 /* If this symbol has a version, and it is the default version, we
1708 create an indirect symbol from the default name to the fully
1709 decorated name. This will cause external references which do not
1710 specify a version to be bound to this version of the symbol. */
1711 p = strchr (name, ELF_VER_CHR);
1712 if (h->versioned == unknown)
1716 h->versioned = unversioned;
1721 if (p[1] != ELF_VER_CHR)
1723 h->versioned = versioned_hidden;
1727 h->versioned = versioned;
1732 /* PR ld/19073: We may see an unversioned definition after the
1738 bed = get_elf_backend_data (abfd);
1739 collect = bed->collect;
1740 dynamic = (abfd->flags & DYNAMIC) != 0;
1742 shortlen = p - name;
1743 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1744 if (shortname == NULL)
1746 memcpy (shortname, name, shortlen);
1747 shortname[shortlen] = '\0';
1749 /* We are going to create a new symbol. Merge it with any existing
1750 symbol with this name. For the purposes of the merge, act as
1751 though we were defining the symbol we just defined, although we
1752 actually going to define an indirect symbol. */
1753 type_change_ok = FALSE;
1754 size_change_ok = FALSE;
1757 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1758 &hi, poldbfd, NULL, NULL, &skip, &override,
1759 &type_change_ok, &size_change_ok, &matched))
1767 /* Add the default symbol if not performing a relocatable link. */
1768 if (! bfd_link_relocatable (info))
1771 if (! (_bfd_generic_link_add_one_symbol
1772 (info, abfd, shortname, BSF_INDIRECT,
1773 bfd_ind_section_ptr,
1774 0, name, FALSE, collect, &bh)))
1776 hi = (struct elf_link_hash_entry *) bh;
1781 /* In this case the symbol named SHORTNAME is overriding the
1782 indirect symbol we want to add. We were planning on making
1783 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1784 is the name without a version. NAME is the fully versioned
1785 name, and it is the default version.
1787 Overriding means that we already saw a definition for the
1788 symbol SHORTNAME in a regular object, and it is overriding
1789 the symbol defined in the dynamic object.
1791 When this happens, we actually want to change NAME, the
1792 symbol we just added, to refer to SHORTNAME. This will cause
1793 references to NAME in the shared object to become references
1794 to SHORTNAME in the regular object. This is what we expect
1795 when we override a function in a shared object: that the
1796 references in the shared object will be mapped to the
1797 definition in the regular object. */
1799 while (hi->root.type == bfd_link_hash_indirect
1800 || hi->root.type == bfd_link_hash_warning)
1801 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1803 h->root.type = bfd_link_hash_indirect;
1804 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1808 hi->ref_dynamic = 1;
1812 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1817 /* Now set HI to H, so that the following code will set the
1818 other fields correctly. */
1822 /* Check if HI is a warning symbol. */
1823 if (hi->root.type == bfd_link_hash_warning)
1824 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1826 /* If there is a duplicate definition somewhere, then HI may not
1827 point to an indirect symbol. We will have reported an error to
1828 the user in that case. */
1830 if (hi->root.type == bfd_link_hash_indirect)
1832 struct elf_link_hash_entry *ht;
1834 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1835 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1837 /* A reference to the SHORTNAME symbol from a dynamic library
1838 will be satisfied by the versioned symbol at runtime. In
1839 effect, we have a reference to the versioned symbol. */
1840 ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1841 hi->dynamic_def |= ht->dynamic_def;
1843 /* See if the new flags lead us to realize that the symbol must
1849 if (! bfd_link_executable (info)
1856 if (hi->ref_regular)
1862 /* We also need to define an indirection from the nondefault version
1866 len = strlen (name);
1867 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1868 if (shortname == NULL)
1870 memcpy (shortname, name, shortlen);
1871 memcpy (shortname + shortlen, p + 1, len - shortlen);
1873 /* Once again, merge with any existing symbol. */
1874 type_change_ok = FALSE;
1875 size_change_ok = FALSE;
1877 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1878 &hi, poldbfd, NULL, NULL, &skip, &override,
1879 &type_change_ok, &size_change_ok, &matched))
1887 /* Here SHORTNAME is a versioned name, so we don't expect to see
1888 the type of override we do in the case above unless it is
1889 overridden by a versioned definition. */
1890 if (hi->root.type != bfd_link_hash_defined
1891 && hi->root.type != bfd_link_hash_defweak)
1892 (*_bfd_error_handler)
1893 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1899 if (! (_bfd_generic_link_add_one_symbol
1900 (info, abfd, shortname, BSF_INDIRECT,
1901 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1903 hi = (struct elf_link_hash_entry *) bh;
1905 /* If there is a duplicate definition somewhere, then HI may not
1906 point to an indirect symbol. We will have reported an error
1907 to the user in that case. */
1909 if (hi->root.type == bfd_link_hash_indirect)
1911 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1912 h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1913 hi->dynamic_def |= h->dynamic_def;
1915 /* See if the new flags lead us to realize that the symbol
1921 if (! bfd_link_executable (info)
1927 if (hi->ref_regular)
1937 /* This routine is used to export all defined symbols into the dynamic
1938 symbol table. It is called via elf_link_hash_traverse. */
1941 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1943 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1945 /* Ignore indirect symbols. These are added by the versioning code. */
1946 if (h->root.type == bfd_link_hash_indirect)
1949 /* Ignore this if we won't export it. */
1950 if (!eif->info->export_dynamic && !h->dynamic)
1953 if (h->dynindx == -1
1954 && (h->def_regular || h->ref_regular)
1955 && ! bfd_hide_sym_by_version (eif->info->version_info,
1956 h->root.root.string))
1958 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1968 /* Look through the symbols which are defined in other shared
1969 libraries and referenced here. Update the list of version
1970 dependencies. This will be put into the .gnu.version_r section.
1971 This function is called via elf_link_hash_traverse. */
1974 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1977 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1978 Elf_Internal_Verneed *t;
1979 Elf_Internal_Vernaux *a;
1982 /* We only care about symbols defined in shared objects with version
1987 || h->verinfo.verdef == NULL
1988 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
1989 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
1992 /* See if we already know about this version. */
1993 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1997 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
2000 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
2001 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
2007 /* This is a new version. Add it to tree we are building. */
2012 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
2015 rinfo->failed = TRUE;
2019 t->vn_bfd = h->verinfo.verdef->vd_bfd;
2020 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
2021 elf_tdata (rinfo->info->output_bfd)->verref = t;
2025 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
2028 rinfo->failed = TRUE;
2032 /* Note that we are copying a string pointer here, and testing it
2033 above. If bfd_elf_string_from_elf_section is ever changed to
2034 discard the string data when low in memory, this will have to be
2036 a->vna_nodename = h->verinfo.verdef->vd_nodename;
2038 a->vna_flags = h->verinfo.verdef->vd_flags;
2039 a->vna_nextptr = t->vn_auxptr;
2041 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
2044 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
2051 /* Figure out appropriate versions for all the symbols. We may not
2052 have the version number script until we have read all of the input
2053 files, so until that point we don't know which symbols should be
2054 local. This function is called via elf_link_hash_traverse. */
2057 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
2059 struct elf_info_failed *sinfo;
2060 struct bfd_link_info *info;
2061 const struct elf_backend_data *bed;
2062 struct elf_info_failed eif;
2066 sinfo = (struct elf_info_failed *) data;
2069 /* Fix the symbol flags. */
2072 if (! _bfd_elf_fix_symbol_flags (h, &eif))
2075 sinfo->failed = TRUE;
2079 /* We only need version numbers for symbols defined in regular
2081 if (!h->def_regular)
2084 bed = get_elf_backend_data (info->output_bfd);
2085 p = strchr (h->root.root.string, ELF_VER_CHR);
2086 if (p != NULL && h->verinfo.vertree == NULL)
2088 struct bfd_elf_version_tree *t;
2091 if (*p == ELF_VER_CHR)
2094 /* If there is no version string, we can just return out. */
2098 /* Look for the version. If we find it, it is no longer weak. */
2099 for (t = sinfo->info->version_info; t != NULL; t = t->next)
2101 if (strcmp (t->name, p) == 0)
2105 struct bfd_elf_version_expr *d;
2107 len = p - h->root.root.string;
2108 alc = (char *) bfd_malloc (len);
2111 sinfo->failed = TRUE;
2114 memcpy (alc, h->root.root.string, len - 1);
2115 alc[len - 1] = '\0';
2116 if (alc[len - 2] == ELF_VER_CHR)
2117 alc[len - 2] = '\0';
2119 h->verinfo.vertree = t;
2123 if (t->globals.list != NULL)
2124 d = (*t->match) (&t->globals, NULL, alc);
2126 /* See if there is anything to force this symbol to
2128 if (d == NULL && t->locals.list != NULL)
2130 d = (*t->match) (&t->locals, NULL, alc);
2133 && ! info->export_dynamic)
2134 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2142 /* If we are building an application, we need to create a
2143 version node for this version. */
2144 if (t == NULL && bfd_link_executable (info))
2146 struct bfd_elf_version_tree **pp;
2149 /* If we aren't going to export this symbol, we don't need
2150 to worry about it. */
2151 if (h->dynindx == -1)
2155 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2158 sinfo->failed = TRUE;
2163 t->name_indx = (unsigned int) -1;
2167 /* Don't count anonymous version tag. */
2168 if (sinfo->info->version_info != NULL
2169 && sinfo->info->version_info->vernum == 0)
2171 for (pp = &sinfo->info->version_info;
2175 t->vernum = version_index;
2179 h->verinfo.vertree = t;
2183 /* We could not find the version for a symbol when
2184 generating a shared archive. Return an error. */
2185 (*_bfd_error_handler)
2186 (_("%B: version node not found for symbol %s"),
2187 info->output_bfd, h->root.root.string);
2188 bfd_set_error (bfd_error_bad_value);
2189 sinfo->failed = TRUE;
2194 /* If we don't have a version for this symbol, see if we can find
2196 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2201 = bfd_find_version_for_sym (sinfo->info->version_info,
2202 h->root.root.string, &hide);
2203 if (h->verinfo.vertree != NULL && hide)
2204 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2210 /* Read and swap the relocs from the section indicated by SHDR. This
2211 may be either a REL or a RELA section. The relocations are
2212 translated into RELA relocations and stored in INTERNAL_RELOCS,
2213 which should have already been allocated to contain enough space.
2214 The EXTERNAL_RELOCS are a buffer where the external form of the
2215 relocations should be stored.
2217 Returns FALSE if something goes wrong. */
2220 elf_link_read_relocs_from_section (bfd *abfd,
2222 Elf_Internal_Shdr *shdr,
2223 void *external_relocs,
2224 Elf_Internal_Rela *internal_relocs)
2226 const struct elf_backend_data *bed;
2227 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2228 const bfd_byte *erela;
2229 const bfd_byte *erelaend;
2230 Elf_Internal_Rela *irela;
2231 Elf_Internal_Shdr *symtab_hdr;
2234 /* Position ourselves at the start of the section. */
2235 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2238 /* Read the relocations. */
2239 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2242 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2243 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2245 bed = get_elf_backend_data (abfd);
2247 /* Convert the external relocations to the internal format. */
2248 if (shdr->sh_entsize == bed->s->sizeof_rel)
2249 swap_in = bed->s->swap_reloc_in;
2250 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2251 swap_in = bed->s->swap_reloca_in;
2254 bfd_set_error (bfd_error_wrong_format);
2258 erela = (const bfd_byte *) external_relocs;
2259 erelaend = erela + shdr->sh_size;
2260 irela = internal_relocs;
2261 while (erela < erelaend)
2265 (*swap_in) (abfd, erela, irela);
2266 r_symndx = ELF32_R_SYM (irela->r_info);
2267 if (bed->s->arch_size == 64)
2271 if ((size_t) r_symndx >= nsyms)
2273 (*_bfd_error_handler)
2274 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2275 " for offset 0x%lx in section `%A'"),
2277 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2278 bfd_set_error (bfd_error_bad_value);
2282 else if (r_symndx != STN_UNDEF)
2284 (*_bfd_error_handler)
2285 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2286 " when the object file has no symbol table"),
2288 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2289 bfd_set_error (bfd_error_bad_value);
2292 irela += bed->s->int_rels_per_ext_rel;
2293 erela += shdr->sh_entsize;
2299 /* Read and swap the relocs for a section O. They may have been
2300 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2301 not NULL, they are used as buffers to read into. They are known to
2302 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2303 the return value is allocated using either malloc or bfd_alloc,
2304 according to the KEEP_MEMORY argument. If O has two relocation
2305 sections (both REL and RELA relocations), then the REL_HDR
2306 relocations will appear first in INTERNAL_RELOCS, followed by the
2307 RELA_HDR relocations. */
2310 _bfd_elf_link_read_relocs (bfd *abfd,
2312 void *external_relocs,
2313 Elf_Internal_Rela *internal_relocs,
2314 bfd_boolean keep_memory)
2316 void *alloc1 = NULL;
2317 Elf_Internal_Rela *alloc2 = NULL;
2318 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2319 struct bfd_elf_section_data *esdo = elf_section_data (o);
2320 Elf_Internal_Rela *internal_rela_relocs;
2322 if (esdo->relocs != NULL)
2323 return esdo->relocs;
2325 if (o->reloc_count == 0)
2328 if (internal_relocs == NULL)
2332 size = o->reloc_count;
2333 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2335 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2337 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2338 if (internal_relocs == NULL)
2342 if (external_relocs == NULL)
2344 bfd_size_type size = 0;
2347 size += esdo->rel.hdr->sh_size;
2349 size += esdo->rela.hdr->sh_size;
2351 alloc1 = bfd_malloc (size);
2354 external_relocs = alloc1;
2357 internal_rela_relocs = internal_relocs;
2360 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2364 external_relocs = (((bfd_byte *) external_relocs)
2365 + esdo->rel.hdr->sh_size);
2366 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2367 * bed->s->int_rels_per_ext_rel);
2371 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2373 internal_rela_relocs)))
2376 /* Cache the results for next time, if we can. */
2378 esdo->relocs = internal_relocs;
2383 /* Don't free alloc2, since if it was allocated we are passing it
2384 back (under the name of internal_relocs). */
2386 return internal_relocs;
2394 bfd_release (abfd, alloc2);
2401 /* Compute the size of, and allocate space for, REL_HDR which is the
2402 section header for a section containing relocations for O. */
2405 _bfd_elf_link_size_reloc_section (bfd *abfd,
2406 struct bfd_elf_section_reloc_data *reldata)
2408 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2410 /* That allows us to calculate the size of the section. */
2411 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2413 /* The contents field must last into write_object_contents, so we
2414 allocate it with bfd_alloc rather than malloc. Also since we
2415 cannot be sure that the contents will actually be filled in,
2416 we zero the allocated space. */
2417 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2418 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2421 if (reldata->hashes == NULL && reldata->count)
2423 struct elf_link_hash_entry **p;
2425 p = ((struct elf_link_hash_entry **)
2426 bfd_zmalloc (reldata->count * sizeof (*p)));
2430 reldata->hashes = p;
2436 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2437 originated from the section given by INPUT_REL_HDR) to the
2441 _bfd_elf_link_output_relocs (bfd *output_bfd,
2442 asection *input_section,
2443 Elf_Internal_Shdr *input_rel_hdr,
2444 Elf_Internal_Rela *internal_relocs,
2445 struct elf_link_hash_entry **rel_hash
2448 Elf_Internal_Rela *irela;
2449 Elf_Internal_Rela *irelaend;
2451 struct bfd_elf_section_reloc_data *output_reldata;
2452 asection *output_section;
2453 const struct elf_backend_data *bed;
2454 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2455 struct bfd_elf_section_data *esdo;
2457 output_section = input_section->output_section;
2459 bed = get_elf_backend_data (output_bfd);
2460 esdo = elf_section_data (output_section);
2461 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2463 output_reldata = &esdo->rel;
2464 swap_out = bed->s->swap_reloc_out;
2466 else if (esdo->rela.hdr
2467 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2469 output_reldata = &esdo->rela;
2470 swap_out = bed->s->swap_reloca_out;
2474 (*_bfd_error_handler)
2475 (_("%B: relocation size mismatch in %B section %A"),
2476 output_bfd, input_section->owner, input_section);
2477 bfd_set_error (bfd_error_wrong_format);
2481 erel = output_reldata->hdr->contents;
2482 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2483 irela = internal_relocs;
2484 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2485 * bed->s->int_rels_per_ext_rel);
2486 while (irela < irelaend)
2488 (*swap_out) (output_bfd, irela, erel);
2489 irela += bed->s->int_rels_per_ext_rel;
2490 erel += input_rel_hdr->sh_entsize;
2493 /* Bump the counter, so that we know where to add the next set of
2495 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2500 /* Make weak undefined symbols in PIE dynamic. */
2503 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2504 struct elf_link_hash_entry *h)
2506 if (bfd_link_pie (info)
2508 && h->root.type == bfd_link_hash_undefweak)
2509 return bfd_elf_link_record_dynamic_symbol (info, h);
2514 /* Fix up the flags for a symbol. This handles various cases which
2515 can only be fixed after all the input files are seen. This is
2516 currently called by both adjust_dynamic_symbol and
2517 assign_sym_version, which is unnecessary but perhaps more robust in
2518 the face of future changes. */
2521 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2522 struct elf_info_failed *eif)
2524 const struct elf_backend_data *bed;
2526 /* If this symbol was mentioned in a non-ELF file, try to set
2527 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2528 permit a non-ELF file to correctly refer to a symbol defined in
2529 an ELF dynamic object. */
2532 while (h->root.type == bfd_link_hash_indirect)
2533 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2535 if (h->root.type != bfd_link_hash_defined
2536 && h->root.type != bfd_link_hash_defweak)
2539 h->ref_regular_nonweak = 1;
2543 if (h->root.u.def.section->owner != NULL
2544 && (bfd_get_flavour (h->root.u.def.section->owner)
2545 == bfd_target_elf_flavour))
2548 h->ref_regular_nonweak = 1;
2554 if (h->dynindx == -1
2558 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2567 /* Unfortunately, NON_ELF is only correct if the symbol
2568 was first seen in a non-ELF file. Fortunately, if the symbol
2569 was first seen in an ELF file, we're probably OK unless the
2570 symbol was defined in a non-ELF file. Catch that case here.
2571 FIXME: We're still in trouble if the symbol was first seen in
2572 a dynamic object, and then later in a non-ELF regular object. */
2573 if ((h->root.type == bfd_link_hash_defined
2574 || h->root.type == bfd_link_hash_defweak)
2576 && (h->root.u.def.section->owner != NULL
2577 ? (bfd_get_flavour (h->root.u.def.section->owner)
2578 != bfd_target_elf_flavour)
2579 : (bfd_is_abs_section (h->root.u.def.section)
2580 && !h->def_dynamic)))
2584 /* Backend specific symbol fixup. */
2585 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2586 if (bed->elf_backend_fixup_symbol
2587 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2590 /* If this is a final link, and the symbol was defined as a common
2591 symbol in a regular object file, and there was no definition in
2592 any dynamic object, then the linker will have allocated space for
2593 the symbol in a common section but the DEF_REGULAR
2594 flag will not have been set. */
2595 if (h->root.type == bfd_link_hash_defined
2599 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2602 /* If -Bsymbolic was used (which means to bind references to global
2603 symbols to the definition within the shared object), and this
2604 symbol was defined in a regular object, then it actually doesn't
2605 need a PLT entry. Likewise, if the symbol has non-default
2606 visibility. If the symbol has hidden or internal visibility, we
2607 will force it local. */
2609 && bfd_link_pic (eif->info)
2610 && is_elf_hash_table (eif->info->hash)
2611 && (SYMBOLIC_BIND (eif->info, h)
2612 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2615 bfd_boolean force_local;
2617 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2618 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2619 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2622 /* If a weak undefined symbol has non-default visibility, we also
2623 hide it from the dynamic linker. */
2624 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2625 && h->root.type == bfd_link_hash_undefweak)
2626 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2628 /* If this is a weak defined symbol in a dynamic object, and we know
2629 the real definition in the dynamic object, copy interesting flags
2630 over to the real definition. */
2631 if (h->u.weakdef != NULL)
2633 /* If the real definition is defined by a regular object file,
2634 don't do anything special. See the longer description in
2635 _bfd_elf_adjust_dynamic_symbol, below. */
2636 if (h->u.weakdef->def_regular)
2637 h->u.weakdef = NULL;
2640 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2642 while (h->root.type == bfd_link_hash_indirect)
2643 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2645 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2646 || h->root.type == bfd_link_hash_defweak);
2647 BFD_ASSERT (weakdef->def_dynamic);
2648 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2649 || weakdef->root.type == bfd_link_hash_defweak);
2650 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2657 /* Make the backend pick a good value for a dynamic symbol. This is
2658 called via elf_link_hash_traverse, and also calls itself
2662 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2664 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2666 const struct elf_backend_data *bed;
2668 if (! is_elf_hash_table (eif->info->hash))
2671 /* Ignore indirect symbols. These are added by the versioning code. */
2672 if (h->root.type == bfd_link_hash_indirect)
2675 /* Fix the symbol flags. */
2676 if (! _bfd_elf_fix_symbol_flags (h, eif))
2679 /* If this symbol does not require a PLT entry, and it is not
2680 defined by a dynamic object, or is not referenced by a regular
2681 object, ignore it. We do have to handle a weak defined symbol,
2682 even if no regular object refers to it, if we decided to add it
2683 to the dynamic symbol table. FIXME: Do we normally need to worry
2684 about symbols which are defined by one dynamic object and
2685 referenced by another one? */
2687 && h->type != STT_GNU_IFUNC
2691 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2693 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2697 /* If we've already adjusted this symbol, don't do it again. This
2698 can happen via a recursive call. */
2699 if (h->dynamic_adjusted)
2702 /* Don't look at this symbol again. Note that we must set this
2703 after checking the above conditions, because we may look at a
2704 symbol once, decide not to do anything, and then get called
2705 recursively later after REF_REGULAR is set below. */
2706 h->dynamic_adjusted = 1;
2708 /* If this is a weak definition, and we know a real definition, and
2709 the real symbol is not itself defined by a regular object file,
2710 then get a good value for the real definition. We handle the
2711 real symbol first, for the convenience of the backend routine.
2713 Note that there is a confusing case here. If the real definition
2714 is defined by a regular object file, we don't get the real symbol
2715 from the dynamic object, but we do get the weak symbol. If the
2716 processor backend uses a COPY reloc, then if some routine in the
2717 dynamic object changes the real symbol, we will not see that
2718 change in the corresponding weak symbol. This is the way other
2719 ELF linkers work as well, and seems to be a result of the shared
2722 I will clarify this issue. Most SVR4 shared libraries define the
2723 variable _timezone and define timezone as a weak synonym. The
2724 tzset call changes _timezone. If you write
2725 extern int timezone;
2727 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2728 you might expect that, since timezone is a synonym for _timezone,
2729 the same number will print both times. However, if the processor
2730 backend uses a COPY reloc, then actually timezone will be copied
2731 into your process image, and, since you define _timezone
2732 yourself, _timezone will not. Thus timezone and _timezone will
2733 wind up at different memory locations. The tzset call will set
2734 _timezone, leaving timezone unchanged. */
2736 if (h->u.weakdef != NULL)
2738 /* If we get to this point, there is an implicit reference to
2739 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2740 h->u.weakdef->ref_regular = 1;
2742 /* Ensure that the backend adjust_dynamic_symbol function sees
2743 H->U.WEAKDEF before H by recursively calling ourselves. */
2744 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2748 /* If a symbol has no type and no size and does not require a PLT
2749 entry, then we are probably about to do the wrong thing here: we
2750 are probably going to create a COPY reloc for an empty object.
2751 This case can arise when a shared object is built with assembly
2752 code, and the assembly code fails to set the symbol type. */
2754 && h->type == STT_NOTYPE
2756 (*_bfd_error_handler)
2757 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2758 h->root.root.string);
2760 dynobj = elf_hash_table (eif->info)->dynobj;
2761 bed = get_elf_backend_data (dynobj);
2763 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2772 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2776 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info,
2777 struct elf_link_hash_entry *h,
2780 unsigned int power_of_two;
2782 asection *sec = h->root.u.def.section;
2784 /* The section aligment of definition is the maximum alignment
2785 requirement of symbols defined in the section. Since we don't
2786 know the symbol alignment requirement, we start with the
2787 maximum alignment and check low bits of the symbol address
2788 for the minimum alignment. */
2789 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2790 mask = ((bfd_vma) 1 << power_of_two) - 1;
2791 while ((h->root.u.def.value & mask) != 0)
2797 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2800 /* Adjust the section alignment if needed. */
2801 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2806 /* We make sure that the symbol will be aligned properly. */
2807 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2809 /* Define the symbol as being at this point in DYNBSS. */
2810 h->root.u.def.section = dynbss;
2811 h->root.u.def.value = dynbss->size;
2813 /* Increment the size of DYNBSS to make room for the symbol. */
2814 dynbss->size += h->size;
2816 /* No error if extern_protected_data is true. */
2817 if (h->protected_def
2818 && (!info->extern_protected_data
2819 || (info->extern_protected_data < 0
2820 && !get_elf_backend_data (dynbss->owner)->extern_protected_data)))
2821 info->callbacks->einfo
2822 (_("%P: copy reloc against protected `%T' is dangerous\n"),
2823 h->root.root.string);
2828 /* Adjust all external symbols pointing into SEC_MERGE sections
2829 to reflect the object merging within the sections. */
2832 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2836 if ((h->root.type == bfd_link_hash_defined
2837 || h->root.type == bfd_link_hash_defweak)
2838 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2839 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2841 bfd *output_bfd = (bfd *) data;
2843 h->root.u.def.value =
2844 _bfd_merged_section_offset (output_bfd,
2845 &h->root.u.def.section,
2846 elf_section_data (sec)->sec_info,
2847 h->root.u.def.value);
2853 /* Returns false if the symbol referred to by H should be considered
2854 to resolve local to the current module, and true if it should be
2855 considered to bind dynamically. */
2858 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2859 struct bfd_link_info *info,
2860 bfd_boolean not_local_protected)
2862 bfd_boolean binding_stays_local_p;
2863 const struct elf_backend_data *bed;
2864 struct elf_link_hash_table *hash_table;
2869 while (h->root.type == bfd_link_hash_indirect
2870 || h->root.type == bfd_link_hash_warning)
2871 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2873 /* If it was forced local, then clearly it's not dynamic. */
2874 if (h->dynindx == -1)
2876 if (h->forced_local)
2879 /* Identify the cases where name binding rules say that a
2880 visible symbol resolves locally. */
2881 binding_stays_local_p = (bfd_link_executable (info)
2882 || SYMBOLIC_BIND (info, h));
2884 switch (ELF_ST_VISIBILITY (h->other))
2891 hash_table = elf_hash_table (info);
2892 if (!is_elf_hash_table (hash_table))
2895 bed = get_elf_backend_data (hash_table->dynobj);
2897 /* Proper resolution for function pointer equality may require
2898 that these symbols perhaps be resolved dynamically, even though
2899 we should be resolving them to the current module. */
2900 if (!not_local_protected || !bed->is_function_type (h->type))
2901 binding_stays_local_p = TRUE;
2908 /* If it isn't defined locally, then clearly it's dynamic. */
2909 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2912 /* Otherwise, the symbol is dynamic if binding rules don't tell
2913 us that it remains local. */
2914 return !binding_stays_local_p;
2917 /* Return true if the symbol referred to by H should be considered
2918 to resolve local to the current module, and false otherwise. Differs
2919 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2920 undefined symbols. The two functions are virtually identical except
2921 for the place where forced_local and dynindx == -1 are tested. If
2922 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2923 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2924 the symbol is local only for defined symbols.
2925 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2926 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2927 treatment of undefined weak symbols. For those that do not make
2928 undefined weak symbols dynamic, both functions may return false. */
2931 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2932 struct bfd_link_info *info,
2933 bfd_boolean local_protected)
2935 const struct elf_backend_data *bed;
2936 struct elf_link_hash_table *hash_table;
2938 /* If it's a local sym, of course we resolve locally. */
2942 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2943 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2944 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2947 /* Common symbols that become definitions don't get the DEF_REGULAR
2948 flag set, so test it first, and don't bail out. */
2949 if (ELF_COMMON_DEF_P (h))
2951 /* If we don't have a definition in a regular file, then we can't
2952 resolve locally. The sym is either undefined or dynamic. */
2953 else if (!h->def_regular)
2956 /* Forced local symbols resolve locally. */
2957 if (h->forced_local)
2960 /* As do non-dynamic symbols. */
2961 if (h->dynindx == -1)
2964 /* At this point, we know the symbol is defined and dynamic. In an
2965 executable it must resolve locally, likewise when building symbolic
2966 shared libraries. */
2967 if (bfd_link_executable (info) || SYMBOLIC_BIND (info, h))
2970 /* Now deal with defined dynamic symbols in shared libraries. Ones
2971 with default visibility might not resolve locally. */
2972 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2975 hash_table = elf_hash_table (info);
2976 if (!is_elf_hash_table (hash_table))
2979 bed = get_elf_backend_data (hash_table->dynobj);
2981 /* If extern_protected_data is false, STV_PROTECTED non-function
2982 symbols are local. */
2983 if ((!info->extern_protected_data
2984 || (info->extern_protected_data < 0
2985 && !bed->extern_protected_data))
2986 && !bed->is_function_type (h->type))
2989 /* Function pointer equality tests may require that STV_PROTECTED
2990 symbols be treated as dynamic symbols. If the address of a
2991 function not defined in an executable is set to that function's
2992 plt entry in the executable, then the address of the function in
2993 a shared library must also be the plt entry in the executable. */
2994 return local_protected;
2997 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2998 aligned. Returns the first TLS output section. */
3000 struct bfd_section *
3001 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
3003 struct bfd_section *sec, *tls;
3004 unsigned int align = 0;
3006 for (sec = obfd->sections; sec != NULL; sec = sec->next)
3007 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
3011 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
3012 if (sec->alignment_power > align)
3013 align = sec->alignment_power;
3015 elf_hash_table (info)->tls_sec = tls;
3017 /* Ensure the alignment of the first section is the largest alignment,
3018 so that the tls segment starts aligned. */
3020 tls->alignment_power = align;
3025 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3027 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
3028 Elf_Internal_Sym *sym)
3030 const struct elf_backend_data *bed;
3032 /* Local symbols do not count, but target specific ones might. */
3033 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
3034 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
3037 bed = get_elf_backend_data (abfd);
3038 /* Function symbols do not count. */
3039 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
3042 /* If the section is undefined, then so is the symbol. */
3043 if (sym->st_shndx == SHN_UNDEF)
3046 /* If the symbol is defined in the common section, then
3047 it is a common definition and so does not count. */
3048 if (bed->common_definition (sym))
3051 /* If the symbol is in a target specific section then we
3052 must rely upon the backend to tell us what it is. */
3053 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
3054 /* FIXME - this function is not coded yet:
3056 return _bfd_is_global_symbol_definition (abfd, sym);
3058 Instead for now assume that the definition is not global,
3059 Even if this is wrong, at least the linker will behave
3060 in the same way that it used to do. */
3066 /* Search the symbol table of the archive element of the archive ABFD
3067 whose archive map contains a mention of SYMDEF, and determine if
3068 the symbol is defined in this element. */
3070 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
3072 Elf_Internal_Shdr * hdr;
3073 bfd_size_type symcount;
3074 bfd_size_type extsymcount;
3075 bfd_size_type extsymoff;
3076 Elf_Internal_Sym *isymbuf;
3077 Elf_Internal_Sym *isym;
3078 Elf_Internal_Sym *isymend;
3081 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
3085 /* Return FALSE if the object has been claimed by plugin. */
3086 if (abfd->plugin_format == bfd_plugin_yes)
3089 if (! bfd_check_format (abfd, bfd_object))
3092 /* Select the appropriate symbol table. */
3093 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
3094 hdr = &elf_tdata (abfd)->symtab_hdr;
3096 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3098 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
3100 /* The sh_info field of the symtab header tells us where the
3101 external symbols start. We don't care about the local symbols. */
3102 if (elf_bad_symtab (abfd))
3104 extsymcount = symcount;
3109 extsymcount = symcount - hdr->sh_info;
3110 extsymoff = hdr->sh_info;
3113 if (extsymcount == 0)
3116 /* Read in the symbol table. */
3117 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3119 if (isymbuf == NULL)
3122 /* Scan the symbol table looking for SYMDEF. */
3124 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
3128 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3133 if (strcmp (name, symdef->name) == 0)
3135 result = is_global_data_symbol_definition (abfd, isym);
3145 /* Add an entry to the .dynamic table. */
3148 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3152 struct elf_link_hash_table *hash_table;
3153 const struct elf_backend_data *bed;
3155 bfd_size_type newsize;
3156 bfd_byte *newcontents;
3157 Elf_Internal_Dyn dyn;
3159 hash_table = elf_hash_table (info);
3160 if (! is_elf_hash_table (hash_table))
3163 bed = get_elf_backend_data (hash_table->dynobj);
3164 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3165 BFD_ASSERT (s != NULL);
3167 newsize = s->size + bed->s->sizeof_dyn;
3168 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3169 if (newcontents == NULL)
3173 dyn.d_un.d_val = val;
3174 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3177 s->contents = newcontents;
3182 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3183 otherwise just check whether one already exists. Returns -1 on error,
3184 1 if a DT_NEEDED tag already exists, and 0 on success. */
3187 elf_add_dt_needed_tag (bfd *abfd,
3188 struct bfd_link_info *info,
3192 struct elf_link_hash_table *hash_table;
3193 bfd_size_type strindex;
3195 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3198 hash_table = elf_hash_table (info);
3199 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3200 if (strindex == (bfd_size_type) -1)
3203 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3206 const struct elf_backend_data *bed;
3209 bed = get_elf_backend_data (hash_table->dynobj);
3210 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3212 for (extdyn = sdyn->contents;
3213 extdyn < sdyn->contents + sdyn->size;
3214 extdyn += bed->s->sizeof_dyn)
3216 Elf_Internal_Dyn dyn;
3218 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3219 if (dyn.d_tag == DT_NEEDED
3220 && dyn.d_un.d_val == strindex)
3222 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3230 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3233 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3237 /* We were just checking for existence of the tag. */
3238 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3244 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3246 for (; needed != NULL; needed = needed->next)
3247 if ((elf_dyn_lib_class (needed->by) & DYN_AS_NEEDED) == 0
3248 && strcmp (soname, needed->name) == 0)
3254 /* Sort symbol by value, section, and size. */
3256 elf_sort_symbol (const void *arg1, const void *arg2)
3258 const struct elf_link_hash_entry *h1;
3259 const struct elf_link_hash_entry *h2;
3260 bfd_signed_vma vdiff;
3262 h1 = *(const struct elf_link_hash_entry **) arg1;
3263 h2 = *(const struct elf_link_hash_entry **) arg2;
3264 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3266 return vdiff > 0 ? 1 : -1;
3269 int sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3271 return sdiff > 0 ? 1 : -1;
3273 vdiff = h1->size - h2->size;
3274 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3277 /* This function is used to adjust offsets into .dynstr for
3278 dynamic symbols. This is called via elf_link_hash_traverse. */
3281 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3283 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3285 if (h->dynindx != -1)
3286 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3290 /* Assign string offsets in .dynstr, update all structures referencing
3294 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3296 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3297 struct elf_link_local_dynamic_entry *entry;
3298 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3299 bfd *dynobj = hash_table->dynobj;
3302 const struct elf_backend_data *bed;
3305 _bfd_elf_strtab_finalize (dynstr);
3306 size = _bfd_elf_strtab_size (dynstr);
3308 bed = get_elf_backend_data (dynobj);
3309 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3310 BFD_ASSERT (sdyn != NULL);
3312 /* Update all .dynamic entries referencing .dynstr strings. */
3313 for (extdyn = sdyn->contents;
3314 extdyn < sdyn->contents + sdyn->size;
3315 extdyn += bed->s->sizeof_dyn)
3317 Elf_Internal_Dyn dyn;
3319 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3323 dyn.d_un.d_val = size;
3333 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3338 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3341 /* Now update local dynamic symbols. */
3342 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3343 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3344 entry->isym.st_name);
3346 /* And the rest of dynamic symbols. */
3347 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3349 /* Adjust version definitions. */
3350 if (elf_tdata (output_bfd)->cverdefs)
3355 Elf_Internal_Verdef def;
3356 Elf_Internal_Verdaux defaux;
3358 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3362 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3364 p += sizeof (Elf_External_Verdef);
3365 if (def.vd_aux != sizeof (Elf_External_Verdef))
3367 for (i = 0; i < def.vd_cnt; ++i)
3369 _bfd_elf_swap_verdaux_in (output_bfd,
3370 (Elf_External_Verdaux *) p, &defaux);
3371 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3373 _bfd_elf_swap_verdaux_out (output_bfd,
3374 &defaux, (Elf_External_Verdaux *) p);
3375 p += sizeof (Elf_External_Verdaux);
3378 while (def.vd_next);
3381 /* Adjust version references. */
3382 if (elf_tdata (output_bfd)->verref)
3387 Elf_Internal_Verneed need;
3388 Elf_Internal_Vernaux needaux;
3390 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3394 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3396 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3397 _bfd_elf_swap_verneed_out (output_bfd, &need,
3398 (Elf_External_Verneed *) p);
3399 p += sizeof (Elf_External_Verneed);
3400 for (i = 0; i < need.vn_cnt; ++i)
3402 _bfd_elf_swap_vernaux_in (output_bfd,
3403 (Elf_External_Vernaux *) p, &needaux);
3404 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3406 _bfd_elf_swap_vernaux_out (output_bfd,
3408 (Elf_External_Vernaux *) p);
3409 p += sizeof (Elf_External_Vernaux);
3412 while (need.vn_next);
3418 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3419 The default is to only match when the INPUT and OUTPUT are exactly
3423 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3424 const bfd_target *output)
3426 return input == output;
3429 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3430 This version is used when different targets for the same architecture
3431 are virtually identical. */
3434 _bfd_elf_relocs_compatible (const bfd_target *input,
3435 const bfd_target *output)
3437 const struct elf_backend_data *obed, *ibed;
3439 if (input == output)
3442 ibed = xvec_get_elf_backend_data (input);
3443 obed = xvec_get_elf_backend_data (output);
3445 if (ibed->arch != obed->arch)
3448 /* If both backends are using this function, deem them compatible. */
3449 return ibed->relocs_compatible == obed->relocs_compatible;
3452 /* Make a special call to the linker "notice" function to tell it that
3453 we are about to handle an as-needed lib, or have finished
3454 processing the lib. */
3457 _bfd_elf_notice_as_needed (bfd *ibfd,
3458 struct bfd_link_info *info,
3459 enum notice_asneeded_action act)
3461 return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
3464 /* Add symbols from an ELF object file to the linker hash table. */
3467 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3469 Elf_Internal_Ehdr *ehdr;
3470 Elf_Internal_Shdr *hdr;
3471 bfd_size_type symcount;
3472 bfd_size_type extsymcount;
3473 bfd_size_type extsymoff;
3474 struct elf_link_hash_entry **sym_hash;
3475 bfd_boolean dynamic;
3476 Elf_External_Versym *extversym = NULL;
3477 Elf_External_Versym *ever;
3478 struct elf_link_hash_entry *weaks;
3479 struct elf_link_hash_entry **nondeflt_vers = NULL;
3480 bfd_size_type nondeflt_vers_cnt = 0;
3481 Elf_Internal_Sym *isymbuf = NULL;
3482 Elf_Internal_Sym *isym;
3483 Elf_Internal_Sym *isymend;
3484 const struct elf_backend_data *bed;
3485 bfd_boolean add_needed;
3486 struct elf_link_hash_table *htab;
3488 void *alloc_mark = NULL;
3489 struct bfd_hash_entry **old_table = NULL;
3490 unsigned int old_size = 0;
3491 unsigned int old_count = 0;
3492 void *old_tab = NULL;
3494 struct bfd_link_hash_entry *old_undefs = NULL;
3495 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3496 long old_dynsymcount = 0;
3497 bfd_size_type old_dynstr_size = 0;
3500 bfd_boolean just_syms;
3502 htab = elf_hash_table (info);
3503 bed = get_elf_backend_data (abfd);
3505 if ((abfd->flags & DYNAMIC) == 0)
3511 /* You can't use -r against a dynamic object. Also, there's no
3512 hope of using a dynamic object which does not exactly match
3513 the format of the output file. */
3514 if (bfd_link_relocatable (info)
3515 || !is_elf_hash_table (htab)
3516 || info->output_bfd->xvec != abfd->xvec)
3518 if (bfd_link_relocatable (info))
3519 bfd_set_error (bfd_error_invalid_operation);
3521 bfd_set_error (bfd_error_wrong_format);
3526 ehdr = elf_elfheader (abfd);
3527 if (info->warn_alternate_em
3528 && bed->elf_machine_code != ehdr->e_machine
3529 && ((bed->elf_machine_alt1 != 0
3530 && ehdr->e_machine == bed->elf_machine_alt1)
3531 || (bed->elf_machine_alt2 != 0
3532 && ehdr->e_machine == bed->elf_machine_alt2)))
3533 info->callbacks->einfo
3534 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3535 ehdr->e_machine, abfd, bed->elf_machine_code);
3537 /* As a GNU extension, any input sections which are named
3538 .gnu.warning.SYMBOL are treated as warning symbols for the given
3539 symbol. This differs from .gnu.warning sections, which generate
3540 warnings when they are included in an output file. */
3541 /* PR 12761: Also generate this warning when building shared libraries. */
3542 for (s = abfd->sections; s != NULL; s = s->next)
3546 name = bfd_get_section_name (abfd, s);
3547 if (CONST_STRNEQ (name, ".gnu.warning."))
3552 name += sizeof ".gnu.warning." - 1;
3554 /* If this is a shared object, then look up the symbol
3555 in the hash table. If it is there, and it is already
3556 been defined, then we will not be using the entry
3557 from this shared object, so we don't need to warn.
3558 FIXME: If we see the definition in a regular object
3559 later on, we will warn, but we shouldn't. The only
3560 fix is to keep track of what warnings we are supposed
3561 to emit, and then handle them all at the end of the
3565 struct elf_link_hash_entry *h;
3567 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3569 /* FIXME: What about bfd_link_hash_common? */
3571 && (h->root.type == bfd_link_hash_defined
3572 || h->root.type == bfd_link_hash_defweak))
3577 msg = (char *) bfd_alloc (abfd, sz + 1);
3581 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3586 if (! (_bfd_generic_link_add_one_symbol
3587 (info, abfd, name, BSF_WARNING, s, 0, msg,
3588 FALSE, bed->collect, NULL)))
3591 if (bfd_link_executable (info))
3593 /* Clobber the section size so that the warning does
3594 not get copied into the output file. */
3597 /* Also set SEC_EXCLUDE, so that symbols defined in
3598 the warning section don't get copied to the output. */
3599 s->flags |= SEC_EXCLUDE;
3604 just_syms = ((s = abfd->sections) != NULL
3605 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);
3610 /* If we are creating a shared library, create all the dynamic
3611 sections immediately. We need to attach them to something,
3612 so we attach them to this BFD, provided it is the right
3613 format and is not from ld --just-symbols. Always create the
3614 dynamic sections for -E/--dynamic-list. FIXME: If there
3615 are no input BFD's of the same format as the output, we can't
3616 make a shared library. */
3618 && (bfd_link_pic (info)
3619 || info->export_dynamic
3621 && is_elf_hash_table (htab)
3622 && info->output_bfd->xvec == abfd->xvec
3623 && !htab->dynamic_sections_created)
3625 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3629 else if (!is_elf_hash_table (htab))
3633 const char *soname = NULL;
3635 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3638 /* ld --just-symbols and dynamic objects don't mix very well.
3639 ld shouldn't allow it. */
3643 /* If this dynamic lib was specified on the command line with
3644 --as-needed in effect, then we don't want to add a DT_NEEDED
3645 tag unless the lib is actually used. Similary for libs brought
3646 in by another lib's DT_NEEDED. When --no-add-needed is used
3647 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3648 any dynamic library in DT_NEEDED tags in the dynamic lib at
3650 add_needed = (elf_dyn_lib_class (abfd)
3651 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3652 | DYN_NO_NEEDED)) == 0;
3654 s = bfd_get_section_by_name (abfd, ".dynamic");
3659 unsigned int elfsec;
3660 unsigned long shlink;
3662 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3669 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3670 if (elfsec == SHN_BAD)
3671 goto error_free_dyn;
3672 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3674 for (extdyn = dynbuf;
3675 extdyn < dynbuf + s->size;
3676 extdyn += bed->s->sizeof_dyn)
3678 Elf_Internal_Dyn dyn;
3680 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3681 if (dyn.d_tag == DT_SONAME)
3683 unsigned int tagv = dyn.d_un.d_val;
3684 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3686 goto error_free_dyn;
3688 if (dyn.d_tag == DT_NEEDED)
3690 struct bfd_link_needed_list *n, **pn;
3692 unsigned int tagv = dyn.d_un.d_val;
3694 amt = sizeof (struct bfd_link_needed_list);
3695 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3696 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3697 if (n == NULL || fnm == NULL)
3698 goto error_free_dyn;
3699 amt = strlen (fnm) + 1;
3700 anm = (char *) bfd_alloc (abfd, amt);
3702 goto error_free_dyn;
3703 memcpy (anm, fnm, amt);
3707 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3711 if (dyn.d_tag == DT_RUNPATH)
3713 struct bfd_link_needed_list *n, **pn;
3715 unsigned int tagv = dyn.d_un.d_val;
3717 amt = sizeof (struct bfd_link_needed_list);
3718 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3719 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3720 if (n == NULL || fnm == NULL)
3721 goto error_free_dyn;
3722 amt = strlen (fnm) + 1;
3723 anm = (char *) bfd_alloc (abfd, amt);
3725 goto error_free_dyn;
3726 memcpy (anm, fnm, amt);
3730 for (pn = & runpath;
3736 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3737 if (!runpath && dyn.d_tag == DT_RPATH)
3739 struct bfd_link_needed_list *n, **pn;
3741 unsigned int tagv = dyn.d_un.d_val;
3743 amt = sizeof (struct bfd_link_needed_list);
3744 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3745 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3746 if (n == NULL || fnm == NULL)
3747 goto error_free_dyn;
3748 amt = strlen (fnm) + 1;
3749 anm = (char *) bfd_alloc (abfd, amt);
3751 goto error_free_dyn;
3752 memcpy (anm, fnm, amt);
3762 if (dyn.d_tag == DT_AUDIT)
3764 unsigned int tagv = dyn.d_un.d_val;
3765 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3772 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3773 frees all more recently bfd_alloc'd blocks as well. */
3779 struct bfd_link_needed_list **pn;
3780 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3785 /* We do not want to include any of the sections in a dynamic
3786 object in the output file. We hack by simply clobbering the
3787 list of sections in the BFD. This could be handled more
3788 cleanly by, say, a new section flag; the existing
3789 SEC_NEVER_LOAD flag is not the one we want, because that one
3790 still implies that the section takes up space in the output
3792 bfd_section_list_clear (abfd);
3794 /* Find the name to use in a DT_NEEDED entry that refers to this
3795 object. If the object has a DT_SONAME entry, we use it.
3796 Otherwise, if the generic linker stuck something in
3797 elf_dt_name, we use that. Otherwise, we just use the file
3799 if (soname == NULL || *soname == '\0')
3801 soname = elf_dt_name (abfd);
3802 if (soname == NULL || *soname == '\0')
3803 soname = bfd_get_filename (abfd);
3806 /* Save the SONAME because sometimes the linker emulation code
3807 will need to know it. */
3808 elf_dt_name (abfd) = soname;
3810 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3814 /* If we have already included this dynamic object in the
3815 link, just ignore it. There is no reason to include a
3816 particular dynamic object more than once. */
3820 /* Save the DT_AUDIT entry for the linker emulation code. */
3821 elf_dt_audit (abfd) = audit;
3824 /* If this is a dynamic object, we always link against the .dynsym
3825 symbol table, not the .symtab symbol table. The dynamic linker
3826 will only see the .dynsym symbol table, so there is no reason to
3827 look at .symtab for a dynamic object. */
3829 if (! dynamic || elf_dynsymtab (abfd) == 0)
3830 hdr = &elf_tdata (abfd)->symtab_hdr;
3832 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3834 symcount = hdr->sh_size / bed->s->sizeof_sym;
3836 /* The sh_info field of the symtab header tells us where the
3837 external symbols start. We don't care about the local symbols at
3839 if (elf_bad_symtab (abfd))
3841 extsymcount = symcount;
3846 extsymcount = symcount - hdr->sh_info;
3847 extsymoff = hdr->sh_info;
3850 sym_hash = elf_sym_hashes (abfd);
3851 if (extsymcount != 0)
3853 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3855 if (isymbuf == NULL)
3858 if (sym_hash == NULL)
3860 /* We store a pointer to the hash table entry for each
3862 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3863 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
3864 if (sym_hash == NULL)
3865 goto error_free_sym;
3866 elf_sym_hashes (abfd) = sym_hash;
3872 /* Read in any version definitions. */
3873 if (!_bfd_elf_slurp_version_tables (abfd,
3874 info->default_imported_symver))
3875 goto error_free_sym;
3877 /* Read in the symbol versions, but don't bother to convert them
3878 to internal format. */
3879 if (elf_dynversym (abfd) != 0)
3881 Elf_Internal_Shdr *versymhdr;
3883 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3884 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3885 if (extversym == NULL)
3886 goto error_free_sym;
3887 amt = versymhdr->sh_size;
3888 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3889 || bfd_bread (extversym, amt, abfd) != amt)
3890 goto error_free_vers;
3894 /* If we are loading an as-needed shared lib, save the symbol table
3895 state before we start adding symbols. If the lib turns out
3896 to be unneeded, restore the state. */
3897 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3902 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3904 struct bfd_hash_entry *p;
3905 struct elf_link_hash_entry *h;
3907 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3909 h = (struct elf_link_hash_entry *) p;
3910 entsize += htab->root.table.entsize;
3911 if (h->root.type == bfd_link_hash_warning)
3912 entsize += htab->root.table.entsize;
3916 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3917 old_tab = bfd_malloc (tabsize + entsize);
3918 if (old_tab == NULL)
3919 goto error_free_vers;
3921 /* Remember the current objalloc pointer, so that all mem for
3922 symbols added can later be reclaimed. */
3923 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3924 if (alloc_mark == NULL)
3925 goto error_free_vers;
3927 /* Make a special call to the linker "notice" function to
3928 tell it that we are about to handle an as-needed lib. */
3929 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
3930 goto error_free_vers;
3932 /* Clone the symbol table. Remember some pointers into the
3933 symbol table, and dynamic symbol count. */
3934 old_ent = (char *) old_tab + tabsize;
3935 memcpy (old_tab, htab->root.table.table, tabsize);
3936 old_undefs = htab->root.undefs;
3937 old_undefs_tail = htab->root.undefs_tail;
3938 old_table = htab->root.table.table;
3939 old_size = htab->root.table.size;
3940 old_count = htab->root.table.count;
3941 old_dynsymcount = htab->dynsymcount;
3942 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
3944 for (i = 0; i < htab->root.table.size; i++)
3946 struct bfd_hash_entry *p;
3947 struct elf_link_hash_entry *h;
3949 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3951 memcpy (old_ent, p, htab->root.table.entsize);
3952 old_ent = (char *) old_ent + htab->root.table.entsize;
3953 h = (struct elf_link_hash_entry *) p;
3954 if (h->root.type == bfd_link_hash_warning)
3956 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3957 old_ent = (char *) old_ent + htab->root.table.entsize;
3964 ever = extversym != NULL ? extversym + extsymoff : NULL;
3965 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3967 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3971 asection *sec, *new_sec;
3974 struct elf_link_hash_entry *h;
3975 struct elf_link_hash_entry *hi;
3976 bfd_boolean definition;
3977 bfd_boolean size_change_ok;
3978 bfd_boolean type_change_ok;
3979 bfd_boolean new_weakdef;
3980 bfd_boolean new_weak;
3981 bfd_boolean old_weak;
3982 bfd_boolean override;
3984 unsigned int old_alignment;
3986 bfd_boolean matched;
3990 flags = BSF_NO_FLAGS;
3992 value = isym->st_value;
3993 common = bed->common_definition (isym);
3995 bind = ELF_ST_BIND (isym->st_info);
3999 /* This should be impossible, since ELF requires that all
4000 global symbols follow all local symbols, and that sh_info
4001 point to the first global symbol. Unfortunately, Irix 5
4006 if (isym->st_shndx != SHN_UNDEF && !common)
4014 case STB_GNU_UNIQUE:
4015 flags = BSF_GNU_UNIQUE;
4019 /* Leave it up to the processor backend. */
4023 if (isym->st_shndx == SHN_UNDEF)
4024 sec = bfd_und_section_ptr;
4025 else if (isym->st_shndx == SHN_ABS)
4026 sec = bfd_abs_section_ptr;
4027 else if (isym->st_shndx == SHN_COMMON)
4029 sec = bfd_com_section_ptr;
4030 /* What ELF calls the size we call the value. What ELF
4031 calls the value we call the alignment. */
4032 value = isym->st_size;
4036 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
4038 sec = bfd_abs_section_ptr;
4039 else if (discarded_section (sec))
4041 /* Symbols from discarded section are undefined. We keep
4043 sec = bfd_und_section_ptr;
4044 isym->st_shndx = SHN_UNDEF;
4046 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
4050 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
4053 goto error_free_vers;
4055 if (isym->st_shndx == SHN_COMMON
4056 && (abfd->flags & BFD_PLUGIN) != 0)
4058 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
4062 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
4064 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
4066 goto error_free_vers;
4070 else if (isym->st_shndx == SHN_COMMON
4071 && ELF_ST_TYPE (isym->st_info) == STT_TLS
4072 && !bfd_link_relocatable (info))
4074 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
4078 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
4079 | SEC_LINKER_CREATED);
4080 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
4082 goto error_free_vers;
4086 else if (bed->elf_add_symbol_hook)
4088 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
4090 goto error_free_vers;
4092 /* The hook function sets the name to NULL if this symbol
4093 should be skipped for some reason. */
4098 /* Sanity check that all possibilities were handled. */
4101 bfd_set_error (bfd_error_bad_value);
4102 goto error_free_vers;
4105 /* Silently discard TLS symbols from --just-syms. There's
4106 no way to combine a static TLS block with a new TLS block
4107 for this executable. */
4108 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
4109 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
4112 if (bfd_is_und_section (sec)
4113 || bfd_is_com_section (sec))
4118 size_change_ok = FALSE;
4119 type_change_ok = bed->type_change_ok;
4126 if (is_elf_hash_table (htab))
4128 Elf_Internal_Versym iver;
4129 unsigned int vernum = 0;
4134 if (info->default_imported_symver)
4135 /* Use the default symbol version created earlier. */
4136 iver.vs_vers = elf_tdata (abfd)->cverdefs;
4141 _bfd_elf_swap_versym_in (abfd, ever, &iver);
4143 vernum = iver.vs_vers & VERSYM_VERSION;
4145 /* If this is a hidden symbol, or if it is not version
4146 1, we append the version name to the symbol name.
4147 However, we do not modify a non-hidden absolute symbol
4148 if it is not a function, because it might be the version
4149 symbol itself. FIXME: What if it isn't? */
4150 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4152 && (!bfd_is_abs_section (sec)
4153 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4156 size_t namelen, verlen, newlen;
4159 if (isym->st_shndx != SHN_UNDEF)
4161 if (vernum > elf_tdata (abfd)->cverdefs)
4163 else if (vernum > 1)
4165 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4171 (*_bfd_error_handler)
4172 (_("%B: %s: invalid version %u (max %d)"),
4174 elf_tdata (abfd)->cverdefs);
4175 bfd_set_error (bfd_error_bad_value);
4176 goto error_free_vers;
4181 /* We cannot simply test for the number of
4182 entries in the VERNEED section since the
4183 numbers for the needed versions do not start
4185 Elf_Internal_Verneed *t;
4188 for (t = elf_tdata (abfd)->verref;
4192 Elf_Internal_Vernaux *a;
4194 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4196 if (a->vna_other == vernum)
4198 verstr = a->vna_nodename;
4207 (*_bfd_error_handler)
4208 (_("%B: %s: invalid needed version %d"),
4209 abfd, name, vernum);
4210 bfd_set_error (bfd_error_bad_value);
4211 goto error_free_vers;
4215 namelen = strlen (name);
4216 verlen = strlen (verstr);
4217 newlen = namelen + verlen + 2;
4218 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4219 && isym->st_shndx != SHN_UNDEF)
4222 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4223 if (newname == NULL)
4224 goto error_free_vers;
4225 memcpy (newname, name, namelen);
4226 p = newname + namelen;
4228 /* If this is a defined non-hidden version symbol,
4229 we add another @ to the name. This indicates the
4230 default version of the symbol. */
4231 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4232 && isym->st_shndx != SHN_UNDEF)
4234 memcpy (p, verstr, verlen + 1);
4239 /* If this symbol has default visibility and the user has
4240 requested we not re-export it, then mark it as hidden. */
4241 if (!bfd_is_und_section (sec)
4244 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4245 isym->st_other = (STV_HIDDEN
4246 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4248 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4249 sym_hash, &old_bfd, &old_weak,
4250 &old_alignment, &skip, &override,
4251 &type_change_ok, &size_change_ok,
4253 goto error_free_vers;
4258 /* Override a definition only if the new symbol matches the
4260 if (override && matched)
4264 while (h->root.type == bfd_link_hash_indirect
4265 || h->root.type == bfd_link_hash_warning)
4266 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4268 if (elf_tdata (abfd)->verdef != NULL
4271 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4274 if (! (_bfd_generic_link_add_one_symbol
4275 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4276 (struct bfd_link_hash_entry **) sym_hash)))
4277 goto error_free_vers;
4280 /* We need to make sure that indirect symbol dynamic flags are
4283 while (h->root.type == bfd_link_hash_indirect
4284 || h->root.type == bfd_link_hash_warning)
4285 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4289 new_weak = (flags & BSF_WEAK) != 0;
4290 new_weakdef = FALSE;
4294 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4295 && is_elf_hash_table (htab)
4296 && h->u.weakdef == NULL)
4298 /* Keep a list of all weak defined non function symbols from
4299 a dynamic object, using the weakdef field. Later in this
4300 function we will set the weakdef field to the correct
4301 value. We only put non-function symbols from dynamic
4302 objects on this list, because that happens to be the only
4303 time we need to know the normal symbol corresponding to a
4304 weak symbol, and the information is time consuming to
4305 figure out. If the weakdef field is not already NULL,
4306 then this symbol was already defined by some previous
4307 dynamic object, and we will be using that previous
4308 definition anyhow. */
4310 h->u.weakdef = weaks;
4315 /* Set the alignment of a common symbol. */
4316 if ((common || bfd_is_com_section (sec))
4317 && h->root.type == bfd_link_hash_common)
4322 align = bfd_log2 (isym->st_value);
4325 /* The new symbol is a common symbol in a shared object.
4326 We need to get the alignment from the section. */
4327 align = new_sec->alignment_power;
4329 if (align > old_alignment)
4330 h->root.u.c.p->alignment_power = align;
4332 h->root.u.c.p->alignment_power = old_alignment;
4335 if (is_elf_hash_table (htab))
4337 /* Set a flag in the hash table entry indicating the type of
4338 reference or definition we just found. A dynamic symbol
4339 is one which is referenced or defined by both a regular
4340 object and a shared object. */
4341 bfd_boolean dynsym = FALSE;
4343 /* Plugin symbols aren't normal. Don't set def_regular or
4344 ref_regular for them, or make them dynamic. */
4345 if ((abfd->flags & BFD_PLUGIN) != 0)
4352 if (bind != STB_WEAK)
4353 h->ref_regular_nonweak = 1;
4365 /* If the indirect symbol has been forced local, don't
4366 make the real symbol dynamic. */
4367 if ((h == hi || !hi->forced_local)
4368 && (bfd_link_dll (info)
4378 hi->ref_dynamic = 1;
4383 hi->def_dynamic = 1;
4386 /* If the indirect symbol has been forced local, don't
4387 make the real symbol dynamic. */
4388 if ((h == hi || !hi->forced_local)
4391 || (h->u.weakdef != NULL
4393 && h->u.weakdef->dynindx != -1)))
4397 /* Check to see if we need to add an indirect symbol for
4398 the default name. */
4400 || (!override && h->root.type == bfd_link_hash_common))
4401 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4402 sec, value, &old_bfd, &dynsym))
4403 goto error_free_vers;
4405 /* Check the alignment when a common symbol is involved. This
4406 can change when a common symbol is overridden by a normal
4407 definition or a common symbol is ignored due to the old
4408 normal definition. We need to make sure the maximum
4409 alignment is maintained. */
4410 if ((old_alignment || common)
4411 && h->root.type != bfd_link_hash_common)
4413 unsigned int common_align;
4414 unsigned int normal_align;
4415 unsigned int symbol_align;
4419 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4420 || h->root.type == bfd_link_hash_defweak);
4422 symbol_align = ffs (h->root.u.def.value) - 1;
4423 if (h->root.u.def.section->owner != NULL
4424 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4426 normal_align = h->root.u.def.section->alignment_power;
4427 if (normal_align > symbol_align)
4428 normal_align = symbol_align;
4431 normal_align = symbol_align;
4435 common_align = old_alignment;
4436 common_bfd = old_bfd;
4441 common_align = bfd_log2 (isym->st_value);
4443 normal_bfd = old_bfd;
4446 if (normal_align < common_align)
4448 /* PR binutils/2735 */
4449 if (normal_bfd == NULL)
4450 (*_bfd_error_handler)
4451 (_("Warning: alignment %u of common symbol `%s' in %B is"
4452 " greater than the alignment (%u) of its section %A"),
4453 common_bfd, h->root.u.def.section,
4454 1 << common_align, name, 1 << normal_align);
4456 (*_bfd_error_handler)
4457 (_("Warning: alignment %u of symbol `%s' in %B"
4458 " is smaller than %u in %B"),
4459 normal_bfd, common_bfd,
4460 1 << normal_align, name, 1 << common_align);
4464 /* Remember the symbol size if it isn't undefined. */
4465 if (isym->st_size != 0
4466 && isym->st_shndx != SHN_UNDEF
4467 && (definition || h->size == 0))
4470 && h->size != isym->st_size
4471 && ! size_change_ok)
4472 (*_bfd_error_handler)
4473 (_("Warning: size of symbol `%s' changed"
4474 " from %lu in %B to %lu in %B"),
4476 name, (unsigned long) h->size,
4477 (unsigned long) isym->st_size);
4479 h->size = isym->st_size;
4482 /* If this is a common symbol, then we always want H->SIZE
4483 to be the size of the common symbol. The code just above
4484 won't fix the size if a common symbol becomes larger. We
4485 don't warn about a size change here, because that is
4486 covered by --warn-common. Allow changes between different
4488 if (h->root.type == bfd_link_hash_common)
4489 h->size = h->root.u.c.size;
4491 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4492 && ((definition && !new_weak)
4493 || (old_weak && h->root.type == bfd_link_hash_common)
4494 || h->type == STT_NOTYPE))
4496 unsigned int type = ELF_ST_TYPE (isym->st_info);
4498 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4500 if (type == STT_GNU_IFUNC
4501 && (abfd->flags & DYNAMIC) != 0)
4504 if (h->type != type)
4506 if (h->type != STT_NOTYPE && ! type_change_ok)
4507 (*_bfd_error_handler)
4508 (_("Warning: type of symbol `%s' changed"
4509 " from %d to %d in %B"),
4510 abfd, name, h->type, type);
4516 /* Merge st_other field. */
4517 elf_merge_st_other (abfd, h, isym, sec, definition, dynamic);
4519 /* We don't want to make debug symbol dynamic. */
4521 && (sec->flags & SEC_DEBUGGING)
4522 && !bfd_link_relocatable (info))
4525 /* Nor should we make plugin symbols dynamic. */
4526 if ((abfd->flags & BFD_PLUGIN) != 0)
4531 h->target_internal = isym->st_target_internal;
4532 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4535 if (definition && !dynamic)
4537 char *p = strchr (name, ELF_VER_CHR);
4538 if (p != NULL && p[1] != ELF_VER_CHR)
4540 /* Queue non-default versions so that .symver x, x@FOO
4541 aliases can be checked. */
4544 amt = ((isymend - isym + 1)
4545 * sizeof (struct elf_link_hash_entry *));
4547 = (struct elf_link_hash_entry **) bfd_malloc (amt);
4549 goto error_free_vers;
4551 nondeflt_vers[nondeflt_vers_cnt++] = h;
4555 if (dynsym && h->dynindx == -1)
4557 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4558 goto error_free_vers;
4559 if (h->u.weakdef != NULL
4561 && h->u.weakdef->dynindx == -1)
4563 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4564 goto error_free_vers;
4567 else if (dynsym && h->dynindx != -1)
4568 /* If the symbol already has a dynamic index, but
4569 visibility says it should not be visible, turn it into
4571 switch (ELF_ST_VISIBILITY (h->other))
4575 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4580 /* Don't add DT_NEEDED for references from the dummy bfd nor
4581 for unmatched symbol. */
4586 && h->ref_regular_nonweak
4588 || (old_bfd->flags & BFD_PLUGIN) == 0))
4589 || (h->ref_dynamic_nonweak
4590 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4591 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4594 const char *soname = elf_dt_name (abfd);
4596 info->callbacks->minfo ("%!", soname, old_bfd,
4597 h->root.root.string);
4599 /* A symbol from a library loaded via DT_NEEDED of some
4600 other library is referenced by a regular object.
4601 Add a DT_NEEDED entry for it. Issue an error if
4602 --no-add-needed is used and the reference was not
4605 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4607 (*_bfd_error_handler)
4608 (_("%B: undefined reference to symbol '%s'"),
4610 bfd_set_error (bfd_error_missing_dso);
4611 goto error_free_vers;
4614 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4615 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4618 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4620 goto error_free_vers;
4622 BFD_ASSERT (ret == 0);
4627 if (extversym != NULL)
4633 if (isymbuf != NULL)
4639 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4643 /* Restore the symbol table. */
4644 old_ent = (char *) old_tab + tabsize;
4645 memset (elf_sym_hashes (abfd), 0,
4646 extsymcount * sizeof (struct elf_link_hash_entry *));
4647 htab->root.table.table = old_table;
4648 htab->root.table.size = old_size;
4649 htab->root.table.count = old_count;
4650 memcpy (htab->root.table.table, old_tab, tabsize);
4651 htab->root.undefs = old_undefs;
4652 htab->root.undefs_tail = old_undefs_tail;
4653 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4654 for (i = 0; i < htab->root.table.size; i++)
4656 struct bfd_hash_entry *p;
4657 struct elf_link_hash_entry *h;
4659 unsigned int alignment_power;
4661 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4663 h = (struct elf_link_hash_entry *) p;
4664 if (h->root.type == bfd_link_hash_warning)
4665 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4666 if (h->dynindx >= old_dynsymcount
4667 && h->dynstr_index < old_dynstr_size)
4668 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4670 /* Preserve the maximum alignment and size for common
4671 symbols even if this dynamic lib isn't on DT_NEEDED
4672 since it can still be loaded at run time by another
4674 if (h->root.type == bfd_link_hash_common)
4676 size = h->root.u.c.size;
4677 alignment_power = h->root.u.c.p->alignment_power;
4682 alignment_power = 0;
4684 memcpy (p, old_ent, htab->root.table.entsize);
4685 old_ent = (char *) old_ent + htab->root.table.entsize;
4686 h = (struct elf_link_hash_entry *) p;
4687 if (h->root.type == bfd_link_hash_warning)
4689 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4690 old_ent = (char *) old_ent + htab->root.table.entsize;
4691 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4693 if (h->root.type == bfd_link_hash_common)
4695 if (size > h->root.u.c.size)
4696 h->root.u.c.size = size;
4697 if (alignment_power > h->root.u.c.p->alignment_power)
4698 h->root.u.c.p->alignment_power = alignment_power;
4703 /* Make a special call to the linker "notice" function to
4704 tell it that symbols added for crefs may need to be removed. */
4705 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4706 goto error_free_vers;
4709 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4711 if (nondeflt_vers != NULL)
4712 free (nondeflt_vers);
4716 if (old_tab != NULL)
4718 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4719 goto error_free_vers;
4724 /* Now that all the symbols from this input file are created, if
4725 not performing a relocatable link, handle .symver foo, foo@BAR
4726 such that any relocs against foo become foo@BAR. */
4727 if (!bfd_link_relocatable (info) && nondeflt_vers != NULL)
4729 bfd_size_type cnt, symidx;
4731 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4733 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4734 char *shortname, *p;
4736 p = strchr (h->root.root.string, ELF_VER_CHR);
4738 || (h->root.type != bfd_link_hash_defined
4739 && h->root.type != bfd_link_hash_defweak))
4742 amt = p - h->root.root.string;
4743 shortname = (char *) bfd_malloc (amt + 1);
4745 goto error_free_vers;
4746 memcpy (shortname, h->root.root.string, amt);
4747 shortname[amt] = '\0';
4749 hi = (struct elf_link_hash_entry *)
4750 bfd_link_hash_lookup (&htab->root, shortname,
4751 FALSE, FALSE, FALSE);
4753 && hi->root.type == h->root.type
4754 && hi->root.u.def.value == h->root.u.def.value
4755 && hi->root.u.def.section == h->root.u.def.section)
4757 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4758 hi->root.type = bfd_link_hash_indirect;
4759 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4760 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4761 sym_hash = elf_sym_hashes (abfd);
4763 for (symidx = 0; symidx < extsymcount; ++symidx)
4764 if (sym_hash[symidx] == hi)
4766 sym_hash[symidx] = h;
4772 free (nondeflt_vers);
4773 nondeflt_vers = NULL;
4776 /* Now set the weakdefs field correctly for all the weak defined
4777 symbols we found. The only way to do this is to search all the
4778 symbols. Since we only need the information for non functions in
4779 dynamic objects, that's the only time we actually put anything on
4780 the list WEAKS. We need this information so that if a regular
4781 object refers to a symbol defined weakly in a dynamic object, the
4782 real symbol in the dynamic object is also put in the dynamic
4783 symbols; we also must arrange for both symbols to point to the
4784 same memory location. We could handle the general case of symbol
4785 aliasing, but a general symbol alias can only be generated in
4786 assembler code, handling it correctly would be very time
4787 consuming, and other ELF linkers don't handle general aliasing
4791 struct elf_link_hash_entry **hpp;
4792 struct elf_link_hash_entry **hppend;
4793 struct elf_link_hash_entry **sorted_sym_hash;
4794 struct elf_link_hash_entry *h;
4797 /* Since we have to search the whole symbol list for each weak
4798 defined symbol, search time for N weak defined symbols will be
4799 O(N^2). Binary search will cut it down to O(NlogN). */
4800 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4801 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4802 if (sorted_sym_hash == NULL)
4804 sym_hash = sorted_sym_hash;
4805 hpp = elf_sym_hashes (abfd);
4806 hppend = hpp + extsymcount;
4808 for (; hpp < hppend; hpp++)
4812 && h->root.type == bfd_link_hash_defined
4813 && !bed->is_function_type (h->type))
4821 qsort (sorted_sym_hash, sym_count,
4822 sizeof (struct elf_link_hash_entry *),
4825 while (weaks != NULL)
4827 struct elf_link_hash_entry *hlook;
4830 size_t i, j, idx = 0;
4833 weaks = hlook->u.weakdef;
4834 hlook->u.weakdef = NULL;
4836 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4837 || hlook->root.type == bfd_link_hash_defweak
4838 || hlook->root.type == bfd_link_hash_common
4839 || hlook->root.type == bfd_link_hash_indirect);
4840 slook = hlook->root.u.def.section;
4841 vlook = hlook->root.u.def.value;
4847 bfd_signed_vma vdiff;
4849 h = sorted_sym_hash[idx];
4850 vdiff = vlook - h->root.u.def.value;
4857 int sdiff = slook->id - h->root.u.def.section->id;
4867 /* We didn't find a value/section match. */
4871 /* With multiple aliases, or when the weak symbol is already
4872 strongly defined, we have multiple matching symbols and
4873 the binary search above may land on any of them. Step
4874 one past the matching symbol(s). */
4877 h = sorted_sym_hash[idx];
4878 if (h->root.u.def.section != slook
4879 || h->root.u.def.value != vlook)
4883 /* Now look back over the aliases. Since we sorted by size
4884 as well as value and section, we'll choose the one with
4885 the largest size. */
4888 h = sorted_sym_hash[idx];
4890 /* Stop if value or section doesn't match. */
4891 if (h->root.u.def.section != slook
4892 || h->root.u.def.value != vlook)
4894 else if (h != hlook)
4896 hlook->u.weakdef = h;
4898 /* If the weak definition is in the list of dynamic
4899 symbols, make sure the real definition is put
4901 if (hlook->dynindx != -1 && h->dynindx == -1)
4903 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4906 free (sorted_sym_hash);
4911 /* If the real definition is in the list of dynamic
4912 symbols, make sure the weak definition is put
4913 there as well. If we don't do this, then the
4914 dynamic loader might not merge the entries for the
4915 real definition and the weak definition. */
4916 if (h->dynindx != -1 && hlook->dynindx == -1)
4918 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4919 goto err_free_sym_hash;
4926 free (sorted_sym_hash);
4929 if (bed->check_directives
4930 && !(*bed->check_directives) (abfd, info))
4933 /* If this object is the same format as the output object, and it is
4934 not a shared library, then let the backend look through the
4937 This is required to build global offset table entries and to
4938 arrange for dynamic relocs. It is not required for the
4939 particular common case of linking non PIC code, even when linking
4940 against shared libraries, but unfortunately there is no way of
4941 knowing whether an object file has been compiled PIC or not.
4942 Looking through the relocs is not particularly time consuming.
4943 The problem is that we must either (1) keep the relocs in memory,
4944 which causes the linker to require additional runtime memory or
4945 (2) read the relocs twice from the input file, which wastes time.
4946 This would be a good case for using mmap.
4948 I have no idea how to handle linking PIC code into a file of a
4949 different format. It probably can't be done. */
4951 && is_elf_hash_table (htab)
4952 && bed->check_relocs != NULL
4953 && elf_object_id (abfd) == elf_hash_table_id (htab)
4954 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4958 for (o = abfd->sections; o != NULL; o = o->next)
4960 Elf_Internal_Rela *internal_relocs;
4963 if ((o->flags & SEC_RELOC) == 0
4964 || o->reloc_count == 0
4965 || ((info->strip == strip_all || info->strip == strip_debugger)
4966 && (o->flags & SEC_DEBUGGING) != 0)
4967 || bfd_is_abs_section (o->output_section))
4970 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4972 if (internal_relocs == NULL)
4975 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4977 if (elf_section_data (o)->relocs != internal_relocs)
4978 free (internal_relocs);
4985 /* If this is a non-traditional link, try to optimize the handling
4986 of the .stab/.stabstr sections. */
4988 && ! info->traditional_format
4989 && is_elf_hash_table (htab)
4990 && (info->strip != strip_all && info->strip != strip_debugger))
4994 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4995 if (stabstr != NULL)
4997 bfd_size_type string_offset = 0;
5000 for (stab = abfd->sections; stab; stab = stab->next)
5001 if (CONST_STRNEQ (stab->name, ".stab")
5002 && (!stab->name[5] ||
5003 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
5004 && (stab->flags & SEC_MERGE) == 0
5005 && !bfd_is_abs_section (stab->output_section))
5007 struct bfd_elf_section_data *secdata;
5009 secdata = elf_section_data (stab);
5010 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
5011 stabstr, &secdata->sec_info,
5014 if (secdata->sec_info)
5015 stab->sec_info_type = SEC_INFO_TYPE_STABS;
5020 if (is_elf_hash_table (htab) && add_needed)
5022 /* Add this bfd to the loaded list. */
5023 struct elf_link_loaded_list *n;
5025 n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n));
5029 n->next = htab->loaded;
5036 if (old_tab != NULL)
5038 if (nondeflt_vers != NULL)
5039 free (nondeflt_vers);
5040 if (extversym != NULL)
5043 if (isymbuf != NULL)
5049 /* Return the linker hash table entry of a symbol that might be
5050 satisfied by an archive symbol. Return -1 on error. */
5052 struct elf_link_hash_entry *
5053 _bfd_elf_archive_symbol_lookup (bfd *abfd,
5054 struct bfd_link_info *info,
5057 struct elf_link_hash_entry *h;
5061 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
5065 /* If this is a default version (the name contains @@), look up the
5066 symbol again with only one `@' as well as without the version.
5067 The effect is that references to the symbol with and without the
5068 version will be matched by the default symbol in the archive. */
5070 p = strchr (name, ELF_VER_CHR);
5071 if (p == NULL || p[1] != ELF_VER_CHR)
5074 /* First check with only one `@'. */
5075 len = strlen (name);
5076 copy = (char *) bfd_alloc (abfd, len);
5078 return (struct elf_link_hash_entry *) 0 - 1;
5080 first = p - name + 1;
5081 memcpy (copy, name, first);
5082 memcpy (copy + first, name + first + 1, len - first);
5084 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
5087 /* We also need to check references to the symbol without the
5089 copy[first - 1] = '\0';
5090 h = elf_link_hash_lookup (elf_hash_table (info), copy,
5091 FALSE, FALSE, TRUE);
5094 bfd_release (abfd, copy);
5098 /* Add symbols from an ELF archive file to the linker hash table. We
5099 don't use _bfd_generic_link_add_archive_symbols because we need to
5100 handle versioned symbols.
5102 Fortunately, ELF archive handling is simpler than that done by
5103 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5104 oddities. In ELF, if we find a symbol in the archive map, and the
5105 symbol is currently undefined, we know that we must pull in that
5108 Unfortunately, we do have to make multiple passes over the symbol
5109 table until nothing further is resolved. */
5112 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
5115 unsigned char *included = NULL;
5119 const struct elf_backend_data *bed;
5120 struct elf_link_hash_entry * (*archive_symbol_lookup)
5121 (bfd *, struct bfd_link_info *, const char *);
5123 if (! bfd_has_map (abfd))
5125 /* An empty archive is a special case. */
5126 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
5128 bfd_set_error (bfd_error_no_armap);
5132 /* Keep track of all symbols we know to be already defined, and all
5133 files we know to be already included. This is to speed up the
5134 second and subsequent passes. */
5135 c = bfd_ardata (abfd)->symdef_count;
5139 amt *= sizeof (*included);
5140 included = (unsigned char *) bfd_zmalloc (amt);
5141 if (included == NULL)
5144 symdefs = bfd_ardata (abfd)->symdefs;
5145 bed = get_elf_backend_data (abfd);
5146 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5159 symdefend = symdef + c;
5160 for (i = 0; symdef < symdefend; symdef++, i++)
5162 struct elf_link_hash_entry *h;
5164 struct bfd_link_hash_entry *undefs_tail;
5169 if (symdef->file_offset == last)
5175 h = archive_symbol_lookup (abfd, info, symdef->name);
5176 if (h == (struct elf_link_hash_entry *) 0 - 1)
5182 if (h->root.type == bfd_link_hash_common)
5184 /* We currently have a common symbol. The archive map contains
5185 a reference to this symbol, so we may want to include it. We
5186 only want to include it however, if this archive element
5187 contains a definition of the symbol, not just another common
5190 Unfortunately some archivers (including GNU ar) will put
5191 declarations of common symbols into their archive maps, as
5192 well as real definitions, so we cannot just go by the archive
5193 map alone. Instead we must read in the element's symbol
5194 table and check that to see what kind of symbol definition
5196 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5199 else if (h->root.type != bfd_link_hash_undefined)
5201 if (h->root.type != bfd_link_hash_undefweak)
5202 /* Symbol must be defined. Don't check it again. */
5207 /* We need to include this archive member. */
5208 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5209 if (element == NULL)
5212 if (! bfd_check_format (element, bfd_object))
5215 undefs_tail = info->hash->undefs_tail;
5217 if (!(*info->callbacks
5218 ->add_archive_element) (info, element, symdef->name, &element))
5220 if (!bfd_link_add_symbols (element, info))
5223 /* If there are any new undefined symbols, we need to make
5224 another pass through the archive in order to see whether
5225 they can be defined. FIXME: This isn't perfect, because
5226 common symbols wind up on undefs_tail and because an
5227 undefined symbol which is defined later on in this pass
5228 does not require another pass. This isn't a bug, but it
5229 does make the code less efficient than it could be. */
5230 if (undefs_tail != info->hash->undefs_tail)
5233 /* Look backward to mark all symbols from this object file
5234 which we have already seen in this pass. */
5238 included[mark] = TRUE;
5243 while (symdefs[mark].file_offset == symdef->file_offset);
5245 /* We mark subsequent symbols from this object file as we go
5246 on through the loop. */
5247 last = symdef->file_offset;
5257 if (included != NULL)
5262 /* Given an ELF BFD, add symbols to the global hash table as
5266 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5268 switch (bfd_get_format (abfd))
5271 return elf_link_add_object_symbols (abfd, info);
5273 return elf_link_add_archive_symbols (abfd, info);
5275 bfd_set_error (bfd_error_wrong_format);
5280 struct hash_codes_info
5282 unsigned long *hashcodes;
5286 /* This function will be called though elf_link_hash_traverse to store
5287 all hash value of the exported symbols in an array. */
5290 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5292 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5297 /* Ignore indirect symbols. These are added by the versioning code. */
5298 if (h->dynindx == -1)
5301 name = h->root.root.string;
5302 if (h->versioned >= versioned)
5304 char *p = strchr (name, ELF_VER_CHR);
5307 alc = (char *) bfd_malloc (p - name + 1);
5313 memcpy (alc, name, p - name);
5314 alc[p - name] = '\0';
5319 /* Compute the hash value. */
5320 ha = bfd_elf_hash (name);
5322 /* Store the found hash value in the array given as the argument. */
5323 *(inf->hashcodes)++ = ha;
5325 /* And store it in the struct so that we can put it in the hash table
5327 h->u.elf_hash_value = ha;
5335 struct collect_gnu_hash_codes
5338 const struct elf_backend_data *bed;
5339 unsigned long int nsyms;
5340 unsigned long int maskbits;
5341 unsigned long int *hashcodes;
5342 unsigned long int *hashval;
5343 unsigned long int *indx;
5344 unsigned long int *counts;
5347 long int min_dynindx;
5348 unsigned long int bucketcount;
5349 unsigned long int symindx;
5350 long int local_indx;
5351 long int shift1, shift2;
5352 unsigned long int mask;
5356 /* This function will be called though elf_link_hash_traverse to store
5357 all hash value of the exported symbols in an array. */
5360 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5362 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5367 /* Ignore indirect symbols. These are added by the versioning code. */
5368 if (h->dynindx == -1)
5371 /* Ignore also local symbols and undefined symbols. */
5372 if (! (*s->bed->elf_hash_symbol) (h))
5375 name = h->root.root.string;
5376 if (h->versioned >= versioned)
5378 char *p = strchr (name, ELF_VER_CHR);
5381 alc = (char *) bfd_malloc (p - name + 1);
5387 memcpy (alc, name, p - name);
5388 alc[p - name] = '\0';
5393 /* Compute the hash value. */
5394 ha = bfd_elf_gnu_hash (name);
5396 /* Store the found hash value in the array for compute_bucket_count,
5397 and also for .dynsym reordering purposes. */
5398 s->hashcodes[s->nsyms] = ha;
5399 s->hashval[h->dynindx] = ha;
5401 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5402 s->min_dynindx = h->dynindx;
5410 /* This function will be called though elf_link_hash_traverse to do
5411 final dynaminc symbol renumbering. */
5414 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5416 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5417 unsigned long int bucket;
5418 unsigned long int val;
5420 /* Ignore indirect symbols. */
5421 if (h->dynindx == -1)
5424 /* Ignore also local symbols and undefined symbols. */
5425 if (! (*s->bed->elf_hash_symbol) (h))
5427 if (h->dynindx >= s->min_dynindx)
5428 h->dynindx = s->local_indx++;
5432 bucket = s->hashval[h->dynindx] % s->bucketcount;
5433 val = (s->hashval[h->dynindx] >> s->shift1)
5434 & ((s->maskbits >> s->shift1) - 1);
5435 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5437 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5438 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5439 if (s->counts[bucket] == 1)
5440 /* Last element terminates the chain. */
5442 bfd_put_32 (s->output_bfd, val,
5443 s->contents + (s->indx[bucket] - s->symindx) * 4);
5444 --s->counts[bucket];
5445 h->dynindx = s->indx[bucket]++;
5449 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5452 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5454 return !(h->forced_local
5455 || h->root.type == bfd_link_hash_undefined
5456 || h->root.type == bfd_link_hash_undefweak
5457 || ((h->root.type == bfd_link_hash_defined
5458 || h->root.type == bfd_link_hash_defweak)
5459 && h->root.u.def.section->output_section == NULL));
5462 /* Array used to determine the number of hash table buckets to use
5463 based on the number of symbols there are. If there are fewer than
5464 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5465 fewer than 37 we use 17 buckets, and so forth. We never use more
5466 than 32771 buckets. */
5468 static const size_t elf_buckets[] =
5470 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5474 /* Compute bucket count for hashing table. We do not use a static set
5475 of possible tables sizes anymore. Instead we determine for all
5476 possible reasonable sizes of the table the outcome (i.e., the
5477 number of collisions etc) and choose the best solution. The
5478 weighting functions are not too simple to allow the table to grow
5479 without bounds. Instead one of the weighting factors is the size.
5480 Therefore the result is always a good payoff between few collisions
5481 (= short chain lengths) and table size. */
5483 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5484 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5485 unsigned long int nsyms,
5488 size_t best_size = 0;
5489 unsigned long int i;
5491 /* We have a problem here. The following code to optimize the table
5492 size requires an integer type with more the 32 bits. If
5493 BFD_HOST_U_64_BIT is set we know about such a type. */
5494 #ifdef BFD_HOST_U_64_BIT
5499 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5500 bfd *dynobj = elf_hash_table (info)->dynobj;
5501 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5502 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5503 unsigned long int *counts;
5505 unsigned int no_improvement_count = 0;
5507 /* Possible optimization parameters: if we have NSYMS symbols we say
5508 that the hashing table must at least have NSYMS/4 and at most
5510 minsize = nsyms / 4;
5513 best_size = maxsize = nsyms * 2;
5518 if ((best_size & 31) == 0)
5522 /* Create array where we count the collisions in. We must use bfd_malloc
5523 since the size could be large. */
5525 amt *= sizeof (unsigned long int);
5526 counts = (unsigned long int *) bfd_malloc (amt);
5530 /* Compute the "optimal" size for the hash table. The criteria is a
5531 minimal chain length. The minor criteria is (of course) the size
5533 for (i = minsize; i < maxsize; ++i)
5535 /* Walk through the array of hashcodes and count the collisions. */
5536 BFD_HOST_U_64_BIT max;
5537 unsigned long int j;
5538 unsigned long int fact;
5540 if (gnu_hash && (i & 31) == 0)
5543 memset (counts, '\0', i * sizeof (unsigned long int));
5545 /* Determine how often each hash bucket is used. */
5546 for (j = 0; j < nsyms; ++j)
5547 ++counts[hashcodes[j] % i];
5549 /* For the weight function we need some information about the
5550 pagesize on the target. This is information need not be 100%
5551 accurate. Since this information is not available (so far) we
5552 define it here to a reasonable default value. If it is crucial
5553 to have a better value some day simply define this value. */
5554 # ifndef BFD_TARGET_PAGESIZE
5555 # define BFD_TARGET_PAGESIZE (4096)
5558 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5560 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5563 /* Variant 1: optimize for short chains. We add the squares
5564 of all the chain lengths (which favors many small chain
5565 over a few long chains). */
5566 for (j = 0; j < i; ++j)
5567 max += counts[j] * counts[j];
5569 /* This adds penalties for the overall size of the table. */
5570 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5573 /* Variant 2: Optimize a lot more for small table. Here we
5574 also add squares of the size but we also add penalties for
5575 empty slots (the +1 term). */
5576 for (j = 0; j < i; ++j)
5577 max += (1 + counts[j]) * (1 + counts[j]);
5579 /* The overall size of the table is considered, but not as
5580 strong as in variant 1, where it is squared. */
5581 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5585 /* Compare with current best results. */
5586 if (max < best_chlen)
5590 no_improvement_count = 0;
5592 /* PR 11843: Avoid futile long searches for the best bucket size
5593 when there are a large number of symbols. */
5594 else if (++no_improvement_count == 100)
5601 #endif /* defined (BFD_HOST_U_64_BIT) */
5603 /* This is the fallback solution if no 64bit type is available or if we
5604 are not supposed to spend much time on optimizations. We select the
5605 bucket count using a fixed set of numbers. */
5606 for (i = 0; elf_buckets[i] != 0; i++)
5608 best_size = elf_buckets[i];
5609 if (nsyms < elf_buckets[i + 1])
5612 if (gnu_hash && best_size < 2)
5619 /* Size any SHT_GROUP section for ld -r. */
5622 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5626 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5627 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5628 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5633 /* Set a default stack segment size. The value in INFO wins. If it
5634 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5635 undefined it is initialized. */
5638 bfd_elf_stack_segment_size (bfd *output_bfd,
5639 struct bfd_link_info *info,
5640 const char *legacy_symbol,
5641 bfd_vma default_size)
5643 struct elf_link_hash_entry *h = NULL;
5645 /* Look for legacy symbol. */
5647 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5648 FALSE, FALSE, FALSE);
5649 if (h && (h->root.type == bfd_link_hash_defined
5650 || h->root.type == bfd_link_hash_defweak)
5652 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5654 /* The symbol has no type if specified on the command line. */
5655 h->type = STT_OBJECT;
5656 if (info->stacksize)
5657 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5658 output_bfd, legacy_symbol);
5659 else if (h->root.u.def.section != bfd_abs_section_ptr)
5660 (*_bfd_error_handler) (_("%B: %s not absolute"),
5661 output_bfd, legacy_symbol);
5663 info->stacksize = h->root.u.def.value;
5666 if (!info->stacksize)
5667 /* If the user didn't set a size, or explicitly inhibit the
5668 size, set it now. */
5669 info->stacksize = default_size;
5671 /* Provide the legacy symbol, if it is referenced. */
5672 if (h && (h->root.type == bfd_link_hash_undefined
5673 || h->root.type == bfd_link_hash_undefweak))
5675 struct bfd_link_hash_entry *bh = NULL;
5677 if (!(_bfd_generic_link_add_one_symbol
5678 (info, output_bfd, legacy_symbol,
5679 BSF_GLOBAL, bfd_abs_section_ptr,
5680 info->stacksize >= 0 ? info->stacksize : 0,
5681 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5684 h = (struct elf_link_hash_entry *) bh;
5686 h->type = STT_OBJECT;
5692 /* Set up the sizes and contents of the ELF dynamic sections. This is
5693 called by the ELF linker emulation before_allocation routine. We
5694 must set the sizes of the sections before the linker sets the
5695 addresses of the various sections. */
5698 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5701 const char *filter_shlib,
5703 const char *depaudit,
5704 const char * const *auxiliary_filters,
5705 struct bfd_link_info *info,
5706 asection **sinterpptr)
5708 bfd_size_type soname_indx;
5710 const struct elf_backend_data *bed;
5711 struct elf_info_failed asvinfo;
5715 soname_indx = (bfd_size_type) -1;
5717 if (!is_elf_hash_table (info->hash))
5720 bed = get_elf_backend_data (output_bfd);
5722 /* Any syms created from now on start with -1 in
5723 got.refcount/offset and plt.refcount/offset. */
5724 elf_hash_table (info)->init_got_refcount
5725 = elf_hash_table (info)->init_got_offset;
5726 elf_hash_table (info)->init_plt_refcount
5727 = elf_hash_table (info)->init_plt_offset;
5729 if (bfd_link_relocatable (info)
5730 && !_bfd_elf_size_group_sections (info))
5733 /* The backend may have to create some sections regardless of whether
5734 we're dynamic or not. */
5735 if (bed->elf_backend_always_size_sections
5736 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5739 /* Determine any GNU_STACK segment requirements, after the backend
5740 has had a chance to set a default segment size. */
5741 if (info->execstack)
5742 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5743 else if (info->noexecstack)
5744 elf_stack_flags (output_bfd) = PF_R | PF_W;
5748 asection *notesec = NULL;
5751 for (inputobj = info->input_bfds;
5753 inputobj = inputobj->link.next)
5758 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5760 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5763 if (s->flags & SEC_CODE)
5767 else if (bed->default_execstack)
5770 if (notesec || info->stacksize > 0)
5771 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5772 if (notesec && exec && bfd_link_relocatable (info)
5773 && notesec->output_section != bfd_abs_section_ptr)
5774 notesec->output_section->flags |= SEC_CODE;
5777 dynobj = elf_hash_table (info)->dynobj;
5779 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5781 struct elf_info_failed eif;
5782 struct elf_link_hash_entry *h;
5784 struct bfd_elf_version_tree *t;
5785 struct bfd_elf_version_expr *d;
5787 bfd_boolean all_defined;
5789 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5790 BFD_ASSERT (*sinterpptr != NULL || !bfd_link_executable (info) || info->nointerp);
5794 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5796 if (soname_indx == (bfd_size_type) -1
5797 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5803 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5805 info->flags |= DF_SYMBOLIC;
5813 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5815 if (indx == (bfd_size_type) -1)
5818 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5819 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5823 if (filter_shlib != NULL)
5827 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5828 filter_shlib, TRUE);
5829 if (indx == (bfd_size_type) -1
5830 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5834 if (auxiliary_filters != NULL)
5836 const char * const *p;
5838 for (p = auxiliary_filters; *p != NULL; p++)
5842 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5844 if (indx == (bfd_size_type) -1
5845 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5854 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5856 if (indx == (bfd_size_type) -1
5857 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5861 if (depaudit != NULL)
5865 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5867 if (indx == (bfd_size_type) -1
5868 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5875 /* If we are supposed to export all symbols into the dynamic symbol
5876 table (this is not the normal case), then do so. */
5877 if (info->export_dynamic
5878 || (bfd_link_executable (info) && info->dynamic))
5880 elf_link_hash_traverse (elf_hash_table (info),
5881 _bfd_elf_export_symbol,
5887 /* Make all global versions with definition. */
5888 for (t = info->version_info; t != NULL; t = t->next)
5889 for (d = t->globals.list; d != NULL; d = d->next)
5890 if (!d->symver && d->literal)
5892 const char *verstr, *name;
5893 size_t namelen, verlen, newlen;
5894 char *newname, *p, leading_char;
5895 struct elf_link_hash_entry *newh;
5897 leading_char = bfd_get_symbol_leading_char (output_bfd);
5899 namelen = strlen (name) + (leading_char != '\0');
5901 verlen = strlen (verstr);
5902 newlen = namelen + verlen + 3;
5904 newname = (char *) bfd_malloc (newlen);
5905 if (newname == NULL)
5907 newname[0] = leading_char;
5908 memcpy (newname + (leading_char != '\0'), name, namelen);
5910 /* Check the hidden versioned definition. */
5911 p = newname + namelen;
5913 memcpy (p, verstr, verlen + 1);
5914 newh = elf_link_hash_lookup (elf_hash_table (info),
5915 newname, FALSE, FALSE,
5918 || (newh->root.type != bfd_link_hash_defined
5919 && newh->root.type != bfd_link_hash_defweak))
5921 /* Check the default versioned definition. */
5923 memcpy (p, verstr, verlen + 1);
5924 newh = elf_link_hash_lookup (elf_hash_table (info),
5925 newname, FALSE, FALSE,
5930 /* Mark this version if there is a definition and it is
5931 not defined in a shared object. */
5933 && !newh->def_dynamic
5934 && (newh->root.type == bfd_link_hash_defined
5935 || newh->root.type == bfd_link_hash_defweak))
5939 /* Attach all the symbols to their version information. */
5940 asvinfo.info = info;
5941 asvinfo.failed = FALSE;
5943 elf_link_hash_traverse (elf_hash_table (info),
5944 _bfd_elf_link_assign_sym_version,
5949 if (!info->allow_undefined_version)
5951 /* Check if all global versions have a definition. */
5953 for (t = info->version_info; t != NULL; t = t->next)
5954 for (d = t->globals.list; d != NULL; d = d->next)
5955 if (d->literal && !d->symver && !d->script)
5957 (*_bfd_error_handler)
5958 (_("%s: undefined version: %s"),
5959 d->pattern, t->name);
5960 all_defined = FALSE;
5965 bfd_set_error (bfd_error_bad_value);
5970 /* Find all symbols which were defined in a dynamic object and make
5971 the backend pick a reasonable value for them. */
5972 elf_link_hash_traverse (elf_hash_table (info),
5973 _bfd_elf_adjust_dynamic_symbol,
5978 /* Add some entries to the .dynamic section. We fill in some of the
5979 values later, in bfd_elf_final_link, but we must add the entries
5980 now so that we know the final size of the .dynamic section. */
5982 /* If there are initialization and/or finalization functions to
5983 call then add the corresponding DT_INIT/DT_FINI entries. */
5984 h = (info->init_function
5985 ? elf_link_hash_lookup (elf_hash_table (info),
5986 info->init_function, FALSE,
5993 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5996 h = (info->fini_function
5997 ? elf_link_hash_lookup (elf_hash_table (info),
5998 info->fini_function, FALSE,
6005 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
6009 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
6010 if (s != NULL && s->linker_has_input)
6012 /* DT_PREINIT_ARRAY is not allowed in shared library. */
6013 if (! bfd_link_executable (info))
6018 for (sub = info->input_bfds; sub != NULL;
6019 sub = sub->link.next)
6020 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
6021 for (o = sub->sections; o != NULL; o = o->next)
6022 if (elf_section_data (o)->this_hdr.sh_type
6023 == SHT_PREINIT_ARRAY)
6025 (*_bfd_error_handler)
6026 (_("%B: .preinit_array section is not allowed in DSO"),
6031 bfd_set_error (bfd_error_nonrepresentable_section);
6035 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
6036 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
6039 s = bfd_get_section_by_name (output_bfd, ".init_array");
6040 if (s != NULL && s->linker_has_input)
6042 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
6043 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
6046 s = bfd_get_section_by_name (output_bfd, ".fini_array");
6047 if (s != NULL && s->linker_has_input)
6049 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
6050 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
6054 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
6055 /* If .dynstr is excluded from the link, we don't want any of
6056 these tags. Strictly, we should be checking each section
6057 individually; This quick check covers for the case where
6058 someone does a /DISCARD/ : { *(*) }. */
6059 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
6061 bfd_size_type strsize;
6063 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6064 if ((info->emit_hash
6065 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
6066 || (info->emit_gnu_hash
6067 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
6068 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
6069 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
6070 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
6071 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
6072 bed->s->sizeof_sym))
6077 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
6080 /* The backend must work out the sizes of all the other dynamic
6083 && bed->elf_backend_size_dynamic_sections != NULL
6084 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
6087 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
6089 unsigned long section_sym_count;
6090 struct bfd_elf_version_tree *verdefs;
6093 /* Set up the version definition section. */
6094 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
6095 BFD_ASSERT (s != NULL);
6097 /* We may have created additional version definitions if we are
6098 just linking a regular application. */
6099 verdefs = info->version_info;
6101 /* Skip anonymous version tag. */
6102 if (verdefs != NULL && verdefs->vernum == 0)
6103 verdefs = verdefs->next;
6105 if (verdefs == NULL && !info->create_default_symver)
6106 s->flags |= SEC_EXCLUDE;
6111 struct bfd_elf_version_tree *t;
6113 Elf_Internal_Verdef def;
6114 Elf_Internal_Verdaux defaux;
6115 struct bfd_link_hash_entry *bh;
6116 struct elf_link_hash_entry *h;
6122 /* Make space for the base version. */
6123 size += sizeof (Elf_External_Verdef);
6124 size += sizeof (Elf_External_Verdaux);
6127 /* Make space for the default version. */
6128 if (info->create_default_symver)
6130 size += sizeof (Elf_External_Verdef);
6134 for (t = verdefs; t != NULL; t = t->next)
6136 struct bfd_elf_version_deps *n;
6138 /* Don't emit base version twice. */
6142 size += sizeof (Elf_External_Verdef);
6143 size += sizeof (Elf_External_Verdaux);
6146 for (n = t->deps; n != NULL; n = n->next)
6147 size += sizeof (Elf_External_Verdaux);
6151 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6152 if (s->contents == NULL && s->size != 0)
6155 /* Fill in the version definition section. */
6159 def.vd_version = VER_DEF_CURRENT;
6160 def.vd_flags = VER_FLG_BASE;
6163 if (info->create_default_symver)
6165 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
6166 def.vd_next = sizeof (Elf_External_Verdef);
6170 def.vd_aux = sizeof (Elf_External_Verdef);
6171 def.vd_next = (sizeof (Elf_External_Verdef)
6172 + sizeof (Elf_External_Verdaux));
6175 if (soname_indx != (bfd_size_type) -1)
6177 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6179 def.vd_hash = bfd_elf_hash (soname);
6180 defaux.vda_name = soname_indx;
6187 name = lbasename (output_bfd->filename);
6188 def.vd_hash = bfd_elf_hash (name);
6189 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6191 if (indx == (bfd_size_type) -1)
6193 defaux.vda_name = indx;
6195 defaux.vda_next = 0;
6197 _bfd_elf_swap_verdef_out (output_bfd, &def,
6198 (Elf_External_Verdef *) p);
6199 p += sizeof (Elf_External_Verdef);
6200 if (info->create_default_symver)
6202 /* Add a symbol representing this version. */
6204 if (! (_bfd_generic_link_add_one_symbol
6205 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6207 get_elf_backend_data (dynobj)->collect, &bh)))
6209 h = (struct elf_link_hash_entry *) bh;
6212 h->type = STT_OBJECT;
6213 h->verinfo.vertree = NULL;
6215 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6218 /* Create a duplicate of the base version with the same
6219 aux block, but different flags. */
6222 def.vd_aux = sizeof (Elf_External_Verdef);
6224 def.vd_next = (sizeof (Elf_External_Verdef)
6225 + sizeof (Elf_External_Verdaux));
6228 _bfd_elf_swap_verdef_out (output_bfd, &def,
6229 (Elf_External_Verdef *) p);
6230 p += sizeof (Elf_External_Verdef);
6232 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6233 (Elf_External_Verdaux *) p);
6234 p += sizeof (Elf_External_Verdaux);
6236 for (t = verdefs; t != NULL; t = t->next)
6239 struct bfd_elf_version_deps *n;
6241 /* Don't emit the base version twice. */
6246 for (n = t->deps; n != NULL; n = n->next)
6249 /* Add a symbol representing this version. */
6251 if (! (_bfd_generic_link_add_one_symbol
6252 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6254 get_elf_backend_data (dynobj)->collect, &bh)))
6256 h = (struct elf_link_hash_entry *) bh;
6259 h->type = STT_OBJECT;
6260 h->verinfo.vertree = t;
6262 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6265 def.vd_version = VER_DEF_CURRENT;
6267 if (t->globals.list == NULL
6268 && t->locals.list == NULL
6270 def.vd_flags |= VER_FLG_WEAK;
6271 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6272 def.vd_cnt = cdeps + 1;
6273 def.vd_hash = bfd_elf_hash (t->name);
6274 def.vd_aux = sizeof (Elf_External_Verdef);
6277 /* If a basever node is next, it *must* be the last node in
6278 the chain, otherwise Verdef construction breaks. */
6279 if (t->next != NULL && t->next->vernum == 0)
6280 BFD_ASSERT (t->next->next == NULL);
6282 if (t->next != NULL && t->next->vernum != 0)
6283 def.vd_next = (sizeof (Elf_External_Verdef)
6284 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6286 _bfd_elf_swap_verdef_out (output_bfd, &def,
6287 (Elf_External_Verdef *) p);
6288 p += sizeof (Elf_External_Verdef);
6290 defaux.vda_name = h->dynstr_index;
6291 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6293 defaux.vda_next = 0;
6294 if (t->deps != NULL)
6295 defaux.vda_next = sizeof (Elf_External_Verdaux);
6296 t->name_indx = defaux.vda_name;
6298 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6299 (Elf_External_Verdaux *) p);
6300 p += sizeof (Elf_External_Verdaux);
6302 for (n = t->deps; n != NULL; n = n->next)
6304 if (n->version_needed == NULL)
6306 /* This can happen if there was an error in the
6308 defaux.vda_name = 0;
6312 defaux.vda_name = n->version_needed->name_indx;
6313 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6316 if (n->next == NULL)
6317 defaux.vda_next = 0;
6319 defaux.vda_next = sizeof (Elf_External_Verdaux);
6321 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6322 (Elf_External_Verdaux *) p);
6323 p += sizeof (Elf_External_Verdaux);
6327 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6328 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6331 elf_tdata (output_bfd)->cverdefs = cdefs;
6334 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6336 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6339 else if (info->flags & DF_BIND_NOW)
6341 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6347 if (bfd_link_executable (info))
6348 info->flags_1 &= ~ (DF_1_INITFIRST
6351 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6355 /* Work out the size of the version reference section. */
6357 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6358 BFD_ASSERT (s != NULL);
6360 struct elf_find_verdep_info sinfo;
6363 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6364 if (sinfo.vers == 0)
6366 sinfo.failed = FALSE;
6368 elf_link_hash_traverse (elf_hash_table (info),
6369 _bfd_elf_link_find_version_dependencies,
6374 if (elf_tdata (output_bfd)->verref == NULL)
6375 s->flags |= SEC_EXCLUDE;
6378 Elf_Internal_Verneed *t;
6383 /* Build the version dependency section. */
6386 for (t = elf_tdata (output_bfd)->verref;
6390 Elf_Internal_Vernaux *a;
6392 size += sizeof (Elf_External_Verneed);
6394 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6395 size += sizeof (Elf_External_Vernaux);
6399 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6400 if (s->contents == NULL)
6404 for (t = elf_tdata (output_bfd)->verref;
6409 Elf_Internal_Vernaux *a;
6413 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6416 t->vn_version = VER_NEED_CURRENT;
6418 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6419 elf_dt_name (t->vn_bfd) != NULL
6420 ? elf_dt_name (t->vn_bfd)
6421 : lbasename (t->vn_bfd->filename),
6423 if (indx == (bfd_size_type) -1)
6426 t->vn_aux = sizeof (Elf_External_Verneed);
6427 if (t->vn_nextref == NULL)
6430 t->vn_next = (sizeof (Elf_External_Verneed)
6431 + caux * sizeof (Elf_External_Vernaux));
6433 _bfd_elf_swap_verneed_out (output_bfd, t,
6434 (Elf_External_Verneed *) p);
6435 p += sizeof (Elf_External_Verneed);
6437 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6439 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6440 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6441 a->vna_nodename, FALSE);
6442 if (indx == (bfd_size_type) -1)
6445 if (a->vna_nextptr == NULL)
6448 a->vna_next = sizeof (Elf_External_Vernaux);
6450 _bfd_elf_swap_vernaux_out (output_bfd, a,
6451 (Elf_External_Vernaux *) p);
6452 p += sizeof (Elf_External_Vernaux);
6456 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6457 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6460 elf_tdata (output_bfd)->cverrefs = crefs;
6464 if ((elf_tdata (output_bfd)->cverrefs == 0
6465 && elf_tdata (output_bfd)->cverdefs == 0)
6466 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6467 §ion_sym_count) == 0)
6469 s = bfd_get_linker_section (dynobj, ".gnu.version");
6470 s->flags |= SEC_EXCLUDE;
6476 /* Find the first non-excluded output section. We'll use its
6477 section symbol for some emitted relocs. */
6479 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6483 for (s = output_bfd->sections; s != NULL; s = s->next)
6484 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6485 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6487 elf_hash_table (info)->text_index_section = s;
6492 /* Find two non-excluded output sections, one for code, one for data.
6493 We'll use their section symbols for some emitted relocs. */
6495 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6499 /* Data first, since setting text_index_section changes
6500 _bfd_elf_link_omit_section_dynsym. */
6501 for (s = output_bfd->sections; s != NULL; s = s->next)
6502 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6503 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6505 elf_hash_table (info)->data_index_section = s;
6509 for (s = output_bfd->sections; s != NULL; s = s->next)
6510 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6511 == (SEC_ALLOC | SEC_READONLY))
6512 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6514 elf_hash_table (info)->text_index_section = s;
6518 if (elf_hash_table (info)->text_index_section == NULL)
6519 elf_hash_table (info)->text_index_section
6520 = elf_hash_table (info)->data_index_section;
6524 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6526 const struct elf_backend_data *bed;
6528 if (!is_elf_hash_table (info->hash))
6531 bed = get_elf_backend_data (output_bfd);
6532 (*bed->elf_backend_init_index_section) (output_bfd, info);
6534 if (elf_hash_table (info)->dynamic_sections_created)
6538 bfd_size_type dynsymcount;
6539 unsigned long section_sym_count;
6540 unsigned int dtagcount;
6542 dynobj = elf_hash_table (info)->dynobj;
6544 /* Assign dynsym indicies. In a shared library we generate a
6545 section symbol for each output section, which come first.
6546 Next come all of the back-end allocated local dynamic syms,
6547 followed by the rest of the global symbols. */
6549 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6550 §ion_sym_count);
6552 /* Work out the size of the symbol version section. */
6553 s = bfd_get_linker_section (dynobj, ".gnu.version");
6554 BFD_ASSERT (s != NULL);
6555 if (dynsymcount != 0
6556 && (s->flags & SEC_EXCLUDE) == 0)
6558 s->size = dynsymcount * sizeof (Elf_External_Versym);
6559 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6560 if (s->contents == NULL)
6563 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6567 /* Set the size of the .dynsym and .hash sections. We counted
6568 the number of dynamic symbols in elf_link_add_object_symbols.
6569 We will build the contents of .dynsym and .hash when we build
6570 the final symbol table, because until then we do not know the
6571 correct value to give the symbols. We built the .dynstr
6572 section as we went along in elf_link_add_object_symbols. */
6573 s = elf_hash_table (info)->dynsym;
6574 BFD_ASSERT (s != NULL);
6575 s->size = dynsymcount * bed->s->sizeof_sym;
6577 if (dynsymcount != 0)
6579 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6580 if (s->contents == NULL)
6583 /* The first entry in .dynsym is a dummy symbol.
6584 Clear all the section syms, in case we don't output them all. */
6585 ++section_sym_count;
6586 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6589 elf_hash_table (info)->bucketcount = 0;
6591 /* Compute the size of the hashing table. As a side effect this
6592 computes the hash values for all the names we export. */
6593 if (info->emit_hash)
6595 unsigned long int *hashcodes;
6596 struct hash_codes_info hashinf;
6598 unsigned long int nsyms;
6600 size_t hash_entry_size;
6602 /* Compute the hash values for all exported symbols. At the same
6603 time store the values in an array so that we could use them for
6605 amt = dynsymcount * sizeof (unsigned long int);
6606 hashcodes = (unsigned long int *) bfd_malloc (amt);
6607 if (hashcodes == NULL)
6609 hashinf.hashcodes = hashcodes;
6610 hashinf.error = FALSE;
6612 /* Put all hash values in HASHCODES. */
6613 elf_link_hash_traverse (elf_hash_table (info),
6614 elf_collect_hash_codes, &hashinf);
6621 nsyms = hashinf.hashcodes - hashcodes;
6623 = compute_bucket_count (info, hashcodes, nsyms, 0);
6626 if (bucketcount == 0)
6629 elf_hash_table (info)->bucketcount = bucketcount;
6631 s = bfd_get_linker_section (dynobj, ".hash");
6632 BFD_ASSERT (s != NULL);
6633 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6634 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6635 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6636 if (s->contents == NULL)
6639 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6640 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6641 s->contents + hash_entry_size);
6644 if (info->emit_gnu_hash)
6647 unsigned char *contents;
6648 struct collect_gnu_hash_codes cinfo;
6652 memset (&cinfo, 0, sizeof (cinfo));
6654 /* Compute the hash values for all exported symbols. At the same
6655 time store the values in an array so that we could use them for
6657 amt = dynsymcount * 2 * sizeof (unsigned long int);
6658 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6659 if (cinfo.hashcodes == NULL)
6662 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6663 cinfo.min_dynindx = -1;
6664 cinfo.output_bfd = output_bfd;
6667 /* Put all hash values in HASHCODES. */
6668 elf_link_hash_traverse (elf_hash_table (info),
6669 elf_collect_gnu_hash_codes, &cinfo);
6672 free (cinfo.hashcodes);
6677 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6679 if (bucketcount == 0)
6681 free (cinfo.hashcodes);
6685 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6686 BFD_ASSERT (s != NULL);
6688 if (cinfo.nsyms == 0)
6690 /* Empty .gnu.hash section is special. */
6691 BFD_ASSERT (cinfo.min_dynindx == -1);
6692 free (cinfo.hashcodes);
6693 s->size = 5 * 4 + bed->s->arch_size / 8;
6694 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6695 if (contents == NULL)
6697 s->contents = contents;
6698 /* 1 empty bucket. */
6699 bfd_put_32 (output_bfd, 1, contents);
6700 /* SYMIDX above the special symbol 0. */
6701 bfd_put_32 (output_bfd, 1, contents + 4);
6702 /* Just one word for bitmask. */
6703 bfd_put_32 (output_bfd, 1, contents + 8);
6704 /* Only hash fn bloom filter. */
6705 bfd_put_32 (output_bfd, 0, contents + 12);
6706 /* No hashes are valid - empty bitmask. */
6707 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6708 /* No hashes in the only bucket. */
6709 bfd_put_32 (output_bfd, 0,
6710 contents + 16 + bed->s->arch_size / 8);
6714 unsigned long int maskwords, maskbitslog2, x;
6715 BFD_ASSERT (cinfo.min_dynindx != -1);
6719 while ((x >>= 1) != 0)
6721 if (maskbitslog2 < 3)
6723 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6724 maskbitslog2 = maskbitslog2 + 3;
6726 maskbitslog2 = maskbitslog2 + 2;
6727 if (bed->s->arch_size == 64)
6729 if (maskbitslog2 == 5)
6735 cinfo.mask = (1 << cinfo.shift1) - 1;
6736 cinfo.shift2 = maskbitslog2;
6737 cinfo.maskbits = 1 << maskbitslog2;
6738 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6739 amt = bucketcount * sizeof (unsigned long int) * 2;
6740 amt += maskwords * sizeof (bfd_vma);
6741 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6742 if (cinfo.bitmask == NULL)
6744 free (cinfo.hashcodes);
6748 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6749 cinfo.indx = cinfo.counts + bucketcount;
6750 cinfo.symindx = dynsymcount - cinfo.nsyms;
6751 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6753 /* Determine how often each hash bucket is used. */
6754 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6755 for (i = 0; i < cinfo.nsyms; ++i)
6756 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6758 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6759 if (cinfo.counts[i] != 0)
6761 cinfo.indx[i] = cnt;
6762 cnt += cinfo.counts[i];
6764 BFD_ASSERT (cnt == dynsymcount);
6765 cinfo.bucketcount = bucketcount;
6766 cinfo.local_indx = cinfo.min_dynindx;
6768 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6769 s->size += cinfo.maskbits / 8;
6770 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6771 if (contents == NULL)
6773 free (cinfo.bitmask);
6774 free (cinfo.hashcodes);
6778 s->contents = contents;
6779 bfd_put_32 (output_bfd, bucketcount, contents);
6780 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6781 bfd_put_32 (output_bfd, maskwords, contents + 8);
6782 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6783 contents += 16 + cinfo.maskbits / 8;
6785 for (i = 0; i < bucketcount; ++i)
6787 if (cinfo.counts[i] == 0)
6788 bfd_put_32 (output_bfd, 0, contents);
6790 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6794 cinfo.contents = contents;
6796 /* Renumber dynamic symbols, populate .gnu.hash section. */
6797 elf_link_hash_traverse (elf_hash_table (info),
6798 elf_renumber_gnu_hash_syms, &cinfo);
6800 contents = s->contents + 16;
6801 for (i = 0; i < maskwords; ++i)
6803 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6805 contents += bed->s->arch_size / 8;
6808 free (cinfo.bitmask);
6809 free (cinfo.hashcodes);
6813 s = bfd_get_linker_section (dynobj, ".dynstr");
6814 BFD_ASSERT (s != NULL);
6816 elf_finalize_dynstr (output_bfd, info);
6818 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6820 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6821 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6828 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6831 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6834 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6835 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6838 /* Finish SHF_MERGE section merging. */
6841 _bfd_elf_merge_sections (bfd *obfd, struct bfd_link_info *info)
6846 if (!is_elf_hash_table (info->hash))
6849 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6850 if ((ibfd->flags & DYNAMIC) == 0
6851 && bfd_get_flavour (ibfd) == bfd_target_elf_flavour
6852 && (elf_elfheader (ibfd)->e_ident[EI_CLASS]
6853 == get_elf_backend_data (obfd)->s->elfclass))
6854 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6855 if ((sec->flags & SEC_MERGE) != 0
6856 && !bfd_is_abs_section (sec->output_section))
6858 struct bfd_elf_section_data *secdata;
6860 secdata = elf_section_data (sec);
6861 if (! _bfd_add_merge_section (obfd,
6862 &elf_hash_table (info)->merge_info,
6863 sec, &secdata->sec_info))
6865 else if (secdata->sec_info)
6866 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6869 if (elf_hash_table (info)->merge_info != NULL)
6870 _bfd_merge_sections (obfd, info, elf_hash_table (info)->merge_info,
6871 merge_sections_remove_hook);
6875 /* Create an entry in an ELF linker hash table. */
6877 struct bfd_hash_entry *
6878 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6879 struct bfd_hash_table *table,
6882 /* Allocate the structure if it has not already been allocated by a
6886 entry = (struct bfd_hash_entry *)
6887 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6892 /* Call the allocation method of the superclass. */
6893 entry = _bfd_link_hash_newfunc (entry, table, string);
6896 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6897 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6899 /* Set local fields. */
6902 ret->got = htab->init_got_refcount;
6903 ret->plt = htab->init_plt_refcount;
6904 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6905 - offsetof (struct elf_link_hash_entry, size)));
6906 /* Assume that we have been called by a non-ELF symbol reader.
6907 This flag is then reset by the code which reads an ELF input
6908 file. This ensures that a symbol created by a non-ELF symbol
6909 reader will have the flag set correctly. */
6916 /* Copy data from an indirect symbol to its direct symbol, hiding the
6917 old indirect symbol. Also used for copying flags to a weakdef. */
6920 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6921 struct elf_link_hash_entry *dir,
6922 struct elf_link_hash_entry *ind)
6924 struct elf_link_hash_table *htab;
6926 /* Copy down any references that we may have already seen to the
6927 symbol which just became indirect if DIR isn't a hidden versioned
6930 if (dir->versioned != versioned_hidden)
6932 dir->ref_dynamic |= ind->ref_dynamic;
6933 dir->ref_regular |= ind->ref_regular;
6934 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6935 dir->non_got_ref |= ind->non_got_ref;
6936 dir->needs_plt |= ind->needs_plt;
6937 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6940 if (ind->root.type != bfd_link_hash_indirect)
6943 /* Copy over the global and procedure linkage table refcount entries.
6944 These may have been already set up by a check_relocs routine. */
6945 htab = elf_hash_table (info);
6946 if (ind->got.refcount > htab->init_got_refcount.refcount)
6948 if (dir->got.refcount < 0)
6949 dir->got.refcount = 0;
6950 dir->got.refcount += ind->got.refcount;
6951 ind->got.refcount = htab->init_got_refcount.refcount;
6954 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6956 if (dir->plt.refcount < 0)
6957 dir->plt.refcount = 0;
6958 dir->plt.refcount += ind->plt.refcount;
6959 ind->plt.refcount = htab->init_plt_refcount.refcount;
6962 if (ind->dynindx != -1)
6964 if (dir->dynindx != -1)
6965 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6966 dir->dynindx = ind->dynindx;
6967 dir->dynstr_index = ind->dynstr_index;
6969 ind->dynstr_index = 0;
6974 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6975 struct elf_link_hash_entry *h,
6976 bfd_boolean force_local)
6978 /* STT_GNU_IFUNC symbol must go through PLT. */
6979 if (h->type != STT_GNU_IFUNC)
6981 h->plt = elf_hash_table (info)->init_plt_offset;
6986 h->forced_local = 1;
6987 if (h->dynindx != -1)
6990 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6996 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7000 _bfd_elf_link_hash_table_init
7001 (struct elf_link_hash_table *table,
7003 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
7004 struct bfd_hash_table *,
7006 unsigned int entsize,
7007 enum elf_target_id target_id)
7010 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
7012 table->init_got_refcount.refcount = can_refcount - 1;
7013 table->init_plt_refcount.refcount = can_refcount - 1;
7014 table->init_got_offset.offset = -(bfd_vma) 1;
7015 table->init_plt_offset.offset = -(bfd_vma) 1;
7016 /* The first dynamic symbol is a dummy. */
7017 table->dynsymcount = 1;
7019 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
7021 table->root.type = bfd_link_elf_hash_table;
7022 table->hash_table_id = target_id;
7027 /* Create an ELF linker hash table. */
7029 struct bfd_link_hash_table *
7030 _bfd_elf_link_hash_table_create (bfd *abfd)
7032 struct elf_link_hash_table *ret;
7033 bfd_size_type amt = sizeof (struct elf_link_hash_table);
7035 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
7039 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
7040 sizeof (struct elf_link_hash_entry),
7046 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
7051 /* Destroy an ELF linker hash table. */
7054 _bfd_elf_link_hash_table_free (bfd *obfd)
7056 struct elf_link_hash_table *htab;
7058 htab = (struct elf_link_hash_table *) obfd->link.hash;
7059 if (htab->dynstr != NULL)
7060 _bfd_elf_strtab_free (htab->dynstr);
7061 _bfd_merge_sections_free (htab->merge_info);
7062 _bfd_generic_link_hash_table_free (obfd);
7065 /* This is a hook for the ELF emulation code in the generic linker to
7066 tell the backend linker what file name to use for the DT_NEEDED
7067 entry for a dynamic object. */
7070 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
7072 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7073 && bfd_get_format (abfd) == bfd_object)
7074 elf_dt_name (abfd) = name;
7078 bfd_elf_get_dyn_lib_class (bfd *abfd)
7081 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7082 && bfd_get_format (abfd) == bfd_object)
7083 lib_class = elf_dyn_lib_class (abfd);
7090 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
7092 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7093 && bfd_get_format (abfd) == bfd_object)
7094 elf_dyn_lib_class (abfd) = lib_class;
7097 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7098 the linker ELF emulation code. */
7100 struct bfd_link_needed_list *
7101 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
7102 struct bfd_link_info *info)
7104 if (! is_elf_hash_table (info->hash))
7106 return elf_hash_table (info)->needed;
7109 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7110 hook for the linker ELF emulation code. */
7112 struct bfd_link_needed_list *
7113 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
7114 struct bfd_link_info *info)
7116 if (! is_elf_hash_table (info->hash))
7118 return elf_hash_table (info)->runpath;
7121 /* Get the name actually used for a dynamic object for a link. This
7122 is the SONAME entry if there is one. Otherwise, it is the string
7123 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7126 bfd_elf_get_dt_soname (bfd *abfd)
7128 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7129 && bfd_get_format (abfd) == bfd_object)
7130 return elf_dt_name (abfd);
7134 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7135 the ELF linker emulation code. */
7138 bfd_elf_get_bfd_needed_list (bfd *abfd,
7139 struct bfd_link_needed_list **pneeded)
7142 bfd_byte *dynbuf = NULL;
7143 unsigned int elfsec;
7144 unsigned long shlink;
7145 bfd_byte *extdyn, *extdynend;
7147 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
7151 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
7152 || bfd_get_format (abfd) != bfd_object)
7155 s = bfd_get_section_by_name (abfd, ".dynamic");
7156 if (s == NULL || s->size == 0)
7159 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
7162 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
7163 if (elfsec == SHN_BAD)
7166 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
7168 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
7169 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
7172 extdynend = extdyn + s->size;
7173 for (; extdyn < extdynend; extdyn += extdynsize)
7175 Elf_Internal_Dyn dyn;
7177 (*swap_dyn_in) (abfd, extdyn, &dyn);
7179 if (dyn.d_tag == DT_NULL)
7182 if (dyn.d_tag == DT_NEEDED)
7185 struct bfd_link_needed_list *l;
7186 unsigned int tagv = dyn.d_un.d_val;
7189 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7194 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7215 struct elf_symbuf_symbol
7217 unsigned long st_name; /* Symbol name, index in string tbl */
7218 unsigned char st_info; /* Type and binding attributes */
7219 unsigned char st_other; /* Visibilty, and target specific */
7222 struct elf_symbuf_head
7224 struct elf_symbuf_symbol *ssym;
7225 bfd_size_type count;
7226 unsigned int st_shndx;
7233 Elf_Internal_Sym *isym;
7234 struct elf_symbuf_symbol *ssym;
7239 /* Sort references to symbols by ascending section number. */
7242 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7244 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7245 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7247 return s1->st_shndx - s2->st_shndx;
7251 elf_sym_name_compare (const void *arg1, const void *arg2)
7253 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7254 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7255 return strcmp (s1->name, s2->name);
7258 static struct elf_symbuf_head *
7259 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7261 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7262 struct elf_symbuf_symbol *ssym;
7263 struct elf_symbuf_head *ssymbuf, *ssymhead;
7264 bfd_size_type i, shndx_count, total_size;
7266 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7270 for (ind = indbuf, i = 0; i < symcount; i++)
7271 if (isymbuf[i].st_shndx != SHN_UNDEF)
7272 *ind++ = &isymbuf[i];
7275 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7276 elf_sort_elf_symbol);
7279 if (indbufend > indbuf)
7280 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7281 if (ind[0]->st_shndx != ind[1]->st_shndx)
7284 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7285 + (indbufend - indbuf) * sizeof (*ssym));
7286 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7287 if (ssymbuf == NULL)
7293 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7294 ssymbuf->ssym = NULL;
7295 ssymbuf->count = shndx_count;
7296 ssymbuf->st_shndx = 0;
7297 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7299 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7302 ssymhead->ssym = ssym;
7303 ssymhead->count = 0;
7304 ssymhead->st_shndx = (*ind)->st_shndx;
7306 ssym->st_name = (*ind)->st_name;
7307 ssym->st_info = (*ind)->st_info;
7308 ssym->st_other = (*ind)->st_other;
7311 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7312 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7319 /* Check if 2 sections define the same set of local and global
7323 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7324 struct bfd_link_info *info)
7327 const struct elf_backend_data *bed1, *bed2;
7328 Elf_Internal_Shdr *hdr1, *hdr2;
7329 bfd_size_type symcount1, symcount2;
7330 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7331 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7332 Elf_Internal_Sym *isym, *isymend;
7333 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7334 bfd_size_type count1, count2, i;
7335 unsigned int shndx1, shndx2;
7341 /* Both sections have to be in ELF. */
7342 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7343 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7346 if (elf_section_type (sec1) != elf_section_type (sec2))
7349 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7350 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7351 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7354 bed1 = get_elf_backend_data (bfd1);
7355 bed2 = get_elf_backend_data (bfd2);
7356 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7357 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7358 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7359 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7361 if (symcount1 == 0 || symcount2 == 0)
7367 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7368 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7370 if (ssymbuf1 == NULL)
7372 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7374 if (isymbuf1 == NULL)
7377 if (!info->reduce_memory_overheads)
7378 elf_tdata (bfd1)->symbuf = ssymbuf1
7379 = elf_create_symbuf (symcount1, isymbuf1);
7382 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7384 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7386 if (isymbuf2 == NULL)
7389 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7390 elf_tdata (bfd2)->symbuf = ssymbuf2
7391 = elf_create_symbuf (symcount2, isymbuf2);
7394 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7396 /* Optimized faster version. */
7397 bfd_size_type lo, hi, mid;
7398 struct elf_symbol *symp;
7399 struct elf_symbuf_symbol *ssym, *ssymend;
7402 hi = ssymbuf1->count;
7407 mid = (lo + hi) / 2;
7408 if (shndx1 < ssymbuf1[mid].st_shndx)
7410 else if (shndx1 > ssymbuf1[mid].st_shndx)
7414 count1 = ssymbuf1[mid].count;
7421 hi = ssymbuf2->count;
7426 mid = (lo + hi) / 2;
7427 if (shndx2 < ssymbuf2[mid].st_shndx)
7429 else if (shndx2 > ssymbuf2[mid].st_shndx)
7433 count2 = ssymbuf2[mid].count;
7439 if (count1 == 0 || count2 == 0 || count1 != count2)
7443 = (struct elf_symbol *) bfd_malloc (count1 * sizeof (*symtable1));
7445 = (struct elf_symbol *) bfd_malloc (count2 * sizeof (*symtable2));
7446 if (symtable1 == NULL || symtable2 == NULL)
7450 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7451 ssym < ssymend; ssym++, symp++)
7453 symp->u.ssym = ssym;
7454 symp->name = bfd_elf_string_from_elf_section (bfd1,
7460 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7461 ssym < ssymend; ssym++, symp++)
7463 symp->u.ssym = ssym;
7464 symp->name = bfd_elf_string_from_elf_section (bfd2,
7469 /* Sort symbol by name. */
7470 qsort (symtable1, count1, sizeof (struct elf_symbol),
7471 elf_sym_name_compare);
7472 qsort (symtable2, count1, sizeof (struct elf_symbol),
7473 elf_sym_name_compare);
7475 for (i = 0; i < count1; i++)
7476 /* Two symbols must have the same binding, type and name. */
7477 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7478 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7479 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7486 symtable1 = (struct elf_symbol *)
7487 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7488 symtable2 = (struct elf_symbol *)
7489 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7490 if (symtable1 == NULL || symtable2 == NULL)
7493 /* Count definitions in the section. */
7495 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7496 if (isym->st_shndx == shndx1)
7497 symtable1[count1++].u.isym = isym;
7500 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7501 if (isym->st_shndx == shndx2)
7502 symtable2[count2++].u.isym = isym;
7504 if (count1 == 0 || count2 == 0 || count1 != count2)
7507 for (i = 0; i < count1; i++)
7509 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7510 symtable1[i].u.isym->st_name);
7512 for (i = 0; i < count2; i++)
7514 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7515 symtable2[i].u.isym->st_name);
7517 /* Sort symbol by name. */
7518 qsort (symtable1, count1, sizeof (struct elf_symbol),
7519 elf_sym_name_compare);
7520 qsort (symtable2, count1, sizeof (struct elf_symbol),
7521 elf_sym_name_compare);
7523 for (i = 0; i < count1; i++)
7524 /* Two symbols must have the same binding, type and name. */
7525 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7526 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7527 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7545 /* Return TRUE if 2 section types are compatible. */
7548 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7549 bfd *bbfd, const asection *bsec)
7553 || abfd->xvec->flavour != bfd_target_elf_flavour
7554 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7557 return elf_section_type (asec) == elf_section_type (bsec);
7560 /* Final phase of ELF linker. */
7562 /* A structure we use to avoid passing large numbers of arguments. */
7564 struct elf_final_link_info
7566 /* General link information. */
7567 struct bfd_link_info *info;
7570 /* Symbol string table. */
7571 struct elf_strtab_hash *symstrtab;
7572 /* .hash section. */
7574 /* symbol version section (.gnu.version). */
7575 asection *symver_sec;
7576 /* Buffer large enough to hold contents of any section. */
7578 /* Buffer large enough to hold external relocs of any section. */
7579 void *external_relocs;
7580 /* Buffer large enough to hold internal relocs of any section. */
7581 Elf_Internal_Rela *internal_relocs;
7582 /* Buffer large enough to hold external local symbols of any input
7584 bfd_byte *external_syms;
7585 /* And a buffer for symbol section indices. */
7586 Elf_External_Sym_Shndx *locsym_shndx;
7587 /* Buffer large enough to hold internal local symbols of any input
7589 Elf_Internal_Sym *internal_syms;
7590 /* Array large enough to hold a symbol index for each local symbol
7591 of any input BFD. */
7593 /* Array large enough to hold a section pointer for each local
7594 symbol of any input BFD. */
7595 asection **sections;
7596 /* Buffer for SHT_SYMTAB_SHNDX section. */
7597 Elf_External_Sym_Shndx *symshndxbuf;
7598 /* Number of STT_FILE syms seen. */
7599 size_t filesym_count;
7602 /* This struct is used to pass information to elf_link_output_extsym. */
7604 struct elf_outext_info
7607 bfd_boolean localsyms;
7608 bfd_boolean file_sym_done;
7609 struct elf_final_link_info *flinfo;
7613 /* Support for evaluating a complex relocation.
7615 Complex relocations are generalized, self-describing relocations. The
7616 implementation of them consists of two parts: complex symbols, and the
7617 relocations themselves.
7619 The relocations are use a reserved elf-wide relocation type code (R_RELC
7620 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7621 information (start bit, end bit, word width, etc) into the addend. This
7622 information is extracted from CGEN-generated operand tables within gas.
7624 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7625 internal) representing prefix-notation expressions, including but not
7626 limited to those sorts of expressions normally encoded as addends in the
7627 addend field. The symbol mangling format is:
7630 | <unary-operator> ':' <node>
7631 | <binary-operator> ':' <node> ':' <node>
7634 <literal> := 's' <digits=N> ':' <N character symbol name>
7635 | 'S' <digits=N> ':' <N character section name>
7639 <binary-operator> := as in C
7640 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7643 set_symbol_value (bfd *bfd_with_globals,
7644 Elf_Internal_Sym *isymbuf,
7649 struct elf_link_hash_entry **sym_hashes;
7650 struct elf_link_hash_entry *h;
7651 size_t extsymoff = locsymcount;
7653 if (symidx < locsymcount)
7655 Elf_Internal_Sym *sym;
7657 sym = isymbuf + symidx;
7658 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7660 /* It is a local symbol: move it to the
7661 "absolute" section and give it a value. */
7662 sym->st_shndx = SHN_ABS;
7663 sym->st_value = val;
7666 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7670 /* It is a global symbol: set its link type
7671 to "defined" and give it a value. */
7673 sym_hashes = elf_sym_hashes (bfd_with_globals);
7674 h = sym_hashes [symidx - extsymoff];
7675 while (h->root.type == bfd_link_hash_indirect
7676 || h->root.type == bfd_link_hash_warning)
7677 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7678 h->root.type = bfd_link_hash_defined;
7679 h->root.u.def.value = val;
7680 h->root.u.def.section = bfd_abs_section_ptr;
7684 resolve_symbol (const char *name,
7686 struct elf_final_link_info *flinfo,
7688 Elf_Internal_Sym *isymbuf,
7691 Elf_Internal_Sym *sym;
7692 struct bfd_link_hash_entry *global_entry;
7693 const char *candidate = NULL;
7694 Elf_Internal_Shdr *symtab_hdr;
7697 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7699 for (i = 0; i < locsymcount; ++ i)
7703 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7706 candidate = bfd_elf_string_from_elf_section (input_bfd,
7707 symtab_hdr->sh_link,
7710 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7711 name, candidate, (unsigned long) sym->st_value);
7713 if (candidate && strcmp (candidate, name) == 0)
7715 asection *sec = flinfo->sections [i];
7717 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7718 *result += sec->output_offset + sec->output_section->vma;
7720 printf ("Found symbol with value %8.8lx\n",
7721 (unsigned long) *result);
7727 /* Hmm, haven't found it yet. perhaps it is a global. */
7728 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7729 FALSE, FALSE, TRUE);
7733 if (global_entry->type == bfd_link_hash_defined
7734 || global_entry->type == bfd_link_hash_defweak)
7736 *result = (global_entry->u.def.value
7737 + global_entry->u.def.section->output_section->vma
7738 + global_entry->u.def.section->output_offset);
7740 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7741 global_entry->root.string, (unsigned long) *result);
7750 resolve_section (const char *name,
7757 for (curr = sections; curr; curr = curr->next)
7758 if (strcmp (curr->name, name) == 0)
7760 *result = curr->vma;
7764 /* Hmm. still haven't found it. try pseudo-section names. */
7765 for (curr = sections; curr; curr = curr->next)
7767 len = strlen (curr->name);
7768 if (len > strlen (name))
7771 if (strncmp (curr->name, name, len) == 0)
7773 if (strncmp (".end", name + len, 4) == 0)
7775 *result = curr->vma + curr->size;
7779 /* Insert more pseudo-section names here, if you like. */
7787 undefined_reference (const char *reftype, const char *name)
7789 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7794 eval_symbol (bfd_vma *result,
7797 struct elf_final_link_info *flinfo,
7799 Elf_Internal_Sym *isymbuf,
7808 const char *sym = *symp;
7810 bfd_boolean symbol_is_section = FALSE;
7815 if (len < 1 || len > sizeof (symbuf))
7817 bfd_set_error (bfd_error_invalid_operation);
7830 *result = strtoul (sym, (char **) symp, 16);
7834 symbol_is_section = TRUE;
7837 symlen = strtol (sym, (char **) symp, 10);
7838 sym = *symp + 1; /* Skip the trailing ':'. */
7840 if (symend < sym || symlen + 1 > sizeof (symbuf))
7842 bfd_set_error (bfd_error_invalid_operation);
7846 memcpy (symbuf, sym, symlen);
7847 symbuf[symlen] = '\0';
7848 *symp = sym + symlen;
7850 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7851 the symbol as a section, or vice-versa. so we're pretty liberal in our
7852 interpretation here; section means "try section first", not "must be a
7853 section", and likewise with symbol. */
7855 if (symbol_is_section)
7857 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result)
7858 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7859 isymbuf, locsymcount))
7861 undefined_reference ("section", symbuf);
7867 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7868 isymbuf, locsymcount)
7869 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7872 undefined_reference ("symbol", symbuf);
7879 /* All that remains are operators. */
7881 #define UNARY_OP(op) \
7882 if (strncmp (sym, #op, strlen (#op)) == 0) \
7884 sym += strlen (#op); \
7888 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7889 isymbuf, locsymcount, signed_p)) \
7892 *result = op ((bfd_signed_vma) a); \
7898 #define BINARY_OP(op) \
7899 if (strncmp (sym, #op, strlen (#op)) == 0) \
7901 sym += strlen (#op); \
7905 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7906 isymbuf, locsymcount, signed_p)) \
7909 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7910 isymbuf, locsymcount, signed_p)) \
7913 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7943 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7944 bfd_set_error (bfd_error_invalid_operation);
7950 put_value (bfd_vma size,
7951 unsigned long chunksz,
7956 location += (size - chunksz);
7958 for (; size; size -= chunksz, location -= chunksz)
7963 bfd_put_8 (input_bfd, x, location);
7967 bfd_put_16 (input_bfd, x, location);
7971 bfd_put_32 (input_bfd, x, location);
7972 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
7978 bfd_put_64 (input_bfd, x, location);
7979 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
7992 get_value (bfd_vma size,
7993 unsigned long chunksz,
8000 /* Sanity checks. */
8001 BFD_ASSERT (chunksz <= sizeof (x)
8004 && (size % chunksz) == 0
8005 && input_bfd != NULL
8006 && location != NULL);
8008 if (chunksz == sizeof (x))
8010 BFD_ASSERT (size == chunksz);
8012 /* Make sure that we do not perform an undefined shift operation.
8013 We know that size == chunksz so there will only be one iteration
8014 of the loop below. */
8018 shift = 8 * chunksz;
8020 for (; size; size -= chunksz, location += chunksz)
8025 x = (x << shift) | bfd_get_8 (input_bfd, location);
8028 x = (x << shift) | bfd_get_16 (input_bfd, location);
8031 x = (x << shift) | bfd_get_32 (input_bfd, location);
8035 x = (x << shift) | bfd_get_64 (input_bfd, location);
8046 decode_complex_addend (unsigned long *start, /* in bits */
8047 unsigned long *oplen, /* in bits */
8048 unsigned long *len, /* in bits */
8049 unsigned long *wordsz, /* in bytes */
8050 unsigned long *chunksz, /* in bytes */
8051 unsigned long *lsb0_p,
8052 unsigned long *signed_p,
8053 unsigned long *trunc_p,
8054 unsigned long encoded)
8056 * start = encoded & 0x3F;
8057 * len = (encoded >> 6) & 0x3F;
8058 * oplen = (encoded >> 12) & 0x3F;
8059 * wordsz = (encoded >> 18) & 0xF;
8060 * chunksz = (encoded >> 22) & 0xF;
8061 * lsb0_p = (encoded >> 27) & 1;
8062 * signed_p = (encoded >> 28) & 1;
8063 * trunc_p = (encoded >> 29) & 1;
8066 bfd_reloc_status_type
8067 bfd_elf_perform_complex_relocation (bfd *input_bfd,
8068 asection *input_section ATTRIBUTE_UNUSED,
8070 Elf_Internal_Rela *rel,
8073 bfd_vma shift, x, mask;
8074 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
8075 bfd_reloc_status_type r;
8077 /* Perform this reloc, since it is complex.
8078 (this is not to say that it necessarily refers to a complex
8079 symbol; merely that it is a self-describing CGEN based reloc.
8080 i.e. the addend has the complete reloc information (bit start, end,
8081 word size, etc) encoded within it.). */
8083 decode_complex_addend (&start, &oplen, &len, &wordsz,
8084 &chunksz, &lsb0_p, &signed_p,
8085 &trunc_p, rel->r_addend);
8087 mask = (((1L << (len - 1)) - 1) << 1) | 1;
8090 shift = (start + 1) - len;
8092 shift = (8 * wordsz) - (start + len);
8094 /* FIXME: octets_per_byte. */
8095 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
8098 printf ("Doing complex reloc: "
8099 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8100 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8101 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8102 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
8103 oplen, (unsigned long) x, (unsigned long) mask,
8104 (unsigned long) relocation);
8109 /* Now do an overflow check. */
8110 r = bfd_check_overflow ((signed_p
8111 ? complain_overflow_signed
8112 : complain_overflow_unsigned),
8113 len, 0, (8 * wordsz),
8117 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
8120 printf (" relocation: %8.8lx\n"
8121 " shifted mask: %8.8lx\n"
8122 " shifted/masked reloc: %8.8lx\n"
8123 " result: %8.8lx\n",
8124 (unsigned long) relocation, (unsigned long) (mask << shift),
8125 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
8127 /* FIXME: octets_per_byte. */
8128 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
8132 /* Functions to read r_offset from external (target order) reloc
8133 entry. Faster than bfd_getl32 et al, because we let the compiler
8134 know the value is aligned. */
8137 ext32l_r_offset (const void *p)
8144 const union aligned32 *a
8145 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8147 uint32_t aval = ( (uint32_t) a->c[0]
8148 | (uint32_t) a->c[1] << 8
8149 | (uint32_t) a->c[2] << 16
8150 | (uint32_t) a->c[3] << 24);
8155 ext32b_r_offset (const void *p)
8162 const union aligned32 *a
8163 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8165 uint32_t aval = ( (uint32_t) a->c[0] << 24
8166 | (uint32_t) a->c[1] << 16
8167 | (uint32_t) a->c[2] << 8
8168 | (uint32_t) a->c[3]);
8172 #ifdef BFD_HOST_64_BIT
8174 ext64l_r_offset (const void *p)
8181 const union aligned64 *a
8182 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8184 uint64_t aval = ( (uint64_t) a->c[0]
8185 | (uint64_t) a->c[1] << 8
8186 | (uint64_t) a->c[2] << 16
8187 | (uint64_t) a->c[3] << 24
8188 | (uint64_t) a->c[4] << 32
8189 | (uint64_t) a->c[5] << 40
8190 | (uint64_t) a->c[6] << 48
8191 | (uint64_t) a->c[7] << 56);
8196 ext64b_r_offset (const void *p)
8203 const union aligned64 *a
8204 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8206 uint64_t aval = ( (uint64_t) a->c[0] << 56
8207 | (uint64_t) a->c[1] << 48
8208 | (uint64_t) a->c[2] << 40
8209 | (uint64_t) a->c[3] << 32
8210 | (uint64_t) a->c[4] << 24
8211 | (uint64_t) a->c[5] << 16
8212 | (uint64_t) a->c[6] << 8
8213 | (uint64_t) a->c[7]);
8218 /* When performing a relocatable link, the input relocations are
8219 preserved. But, if they reference global symbols, the indices
8220 referenced must be updated. Update all the relocations found in
8224 elf_link_adjust_relocs (bfd *abfd,
8225 struct bfd_elf_section_reloc_data *reldata,
8229 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8231 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8232 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8233 bfd_vma r_type_mask;
8235 unsigned int count = reldata->count;
8236 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8238 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8240 swap_in = bed->s->swap_reloc_in;
8241 swap_out = bed->s->swap_reloc_out;
8243 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8245 swap_in = bed->s->swap_reloca_in;
8246 swap_out = bed->s->swap_reloca_out;
8251 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8254 if (bed->s->arch_size == 32)
8261 r_type_mask = 0xffffffff;
8265 erela = reldata->hdr->contents;
8266 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8268 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8271 if (*rel_hash == NULL)
8274 BFD_ASSERT ((*rel_hash)->indx >= 0);
8276 (*swap_in) (abfd, erela, irela);
8277 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8278 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8279 | (irela[j].r_info & r_type_mask));
8280 (*swap_out) (abfd, irela, erela);
8283 if (sort && count != 0)
8285 bfd_vma (*ext_r_off) (const void *);
8288 bfd_byte *base, *end, *p, *loc;
8289 bfd_byte *buf = NULL;
8291 if (bed->s->arch_size == 32)
8293 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8294 ext_r_off = ext32l_r_offset;
8295 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8296 ext_r_off = ext32b_r_offset;
8302 #ifdef BFD_HOST_64_BIT
8303 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8304 ext_r_off = ext64l_r_offset;
8305 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8306 ext_r_off = ext64b_r_offset;
8312 /* Must use a stable sort here. A modified insertion sort,
8313 since the relocs are mostly sorted already. */
8314 elt_size = reldata->hdr->sh_entsize;
8315 base = reldata->hdr->contents;
8316 end = base + count * elt_size;
8317 if (elt_size > sizeof (Elf64_External_Rela))
8320 /* Ensure the first element is lowest. This acts as a sentinel,
8321 speeding the main loop below. */
8322 r_off = (*ext_r_off) (base);
8323 for (p = loc = base; (p += elt_size) < end; )
8325 bfd_vma r_off2 = (*ext_r_off) (p);
8334 /* Don't just swap *base and *loc as that changes the order
8335 of the original base[0] and base[1] if they happen to
8336 have the same r_offset. */
8337 bfd_byte onebuf[sizeof (Elf64_External_Rela)];
8338 memcpy (onebuf, loc, elt_size);
8339 memmove (base + elt_size, base, loc - base);
8340 memcpy (base, onebuf, elt_size);
8343 for (p = base + elt_size; (p += elt_size) < end; )
8345 /* base to p is sorted, *p is next to insert. */
8346 r_off = (*ext_r_off) (p);
8347 /* Search the sorted region for location to insert. */
8349 while (r_off < (*ext_r_off) (loc))
8354 /* Chances are there is a run of relocs to insert here,
8355 from one of more input files. Files are not always
8356 linked in order due to the way elf_link_input_bfd is
8357 called. See pr17666. */
8358 size_t sortlen = p - loc;
8359 bfd_vma r_off2 = (*ext_r_off) (loc);
8360 size_t runlen = elt_size;
8361 size_t buf_size = 96 * 1024;
8362 while (p + runlen < end
8363 && (sortlen <= buf_size
8364 || runlen + elt_size <= buf_size)
8365 && r_off2 > (*ext_r_off) (p + runlen))
8369 buf = bfd_malloc (buf_size);
8373 if (runlen < sortlen)
8375 memcpy (buf, p, runlen);
8376 memmove (loc + runlen, loc, sortlen);
8377 memcpy (loc, buf, runlen);
8381 memcpy (buf, loc, sortlen);
8382 memmove (loc, p, runlen);
8383 memcpy (loc + runlen, buf, sortlen);
8385 p += runlen - elt_size;
8388 /* Hashes are no longer valid. */
8389 free (reldata->hashes);
8390 reldata->hashes = NULL;
8396 struct elf_link_sort_rela
8402 enum elf_reloc_type_class type;
8403 /* We use this as an array of size int_rels_per_ext_rel. */
8404 Elf_Internal_Rela rela[1];
8408 elf_link_sort_cmp1 (const void *A, const void *B)
8410 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8411 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8412 int relativea, relativeb;
8414 relativea = a->type == reloc_class_relative;
8415 relativeb = b->type == reloc_class_relative;
8417 if (relativea < relativeb)
8419 if (relativea > relativeb)
8421 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8423 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8425 if (a->rela->r_offset < b->rela->r_offset)
8427 if (a->rela->r_offset > b->rela->r_offset)
8433 elf_link_sort_cmp2 (const void *A, const void *B)
8435 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8436 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8438 if (a->type < b->type)
8440 if (a->type > b->type)
8442 if (a->u.offset < b->u.offset)
8444 if (a->u.offset > b->u.offset)
8446 if (a->rela->r_offset < b->rela->r_offset)
8448 if (a->rela->r_offset > b->rela->r_offset)
8454 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8456 asection *dynamic_relocs;
8459 bfd_size_type count, size;
8460 size_t i, ret, sort_elt, ext_size;
8461 bfd_byte *sort, *s_non_relative, *p;
8462 struct elf_link_sort_rela *sq;
8463 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8464 int i2e = bed->s->int_rels_per_ext_rel;
8465 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8466 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8467 struct bfd_link_order *lo;
8469 bfd_boolean use_rela;
8471 /* Find a dynamic reloc section. */
8472 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8473 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8474 if (rela_dyn != NULL && rela_dyn->size > 0
8475 && rel_dyn != NULL && rel_dyn->size > 0)
8477 bfd_boolean use_rela_initialised = FALSE;
8479 /* This is just here to stop gcc from complaining.
8480 It's initialization checking code is not perfect. */
8483 /* Both sections are present. Examine the sizes
8484 of the indirect sections to help us choose. */
8485 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8486 if (lo->type == bfd_indirect_link_order)
8488 asection *o = lo->u.indirect.section;
8490 if ((o->size % bed->s->sizeof_rela) == 0)
8492 if ((o->size % bed->s->sizeof_rel) == 0)
8493 /* Section size is divisible by both rel and rela sizes.
8494 It is of no help to us. */
8498 /* Section size is only divisible by rela. */
8499 if (use_rela_initialised && (use_rela == FALSE))
8502 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8503 bfd_set_error (bfd_error_invalid_operation);
8509 use_rela_initialised = TRUE;
8513 else if ((o->size % bed->s->sizeof_rel) == 0)
8515 /* Section size is only divisible by rel. */
8516 if (use_rela_initialised && (use_rela == TRUE))
8519 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8520 bfd_set_error (bfd_error_invalid_operation);
8526 use_rela_initialised = TRUE;
8531 /* The section size is not divisible by either - something is wrong. */
8533 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8534 bfd_set_error (bfd_error_invalid_operation);
8539 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8540 if (lo->type == bfd_indirect_link_order)
8542 asection *o = lo->u.indirect.section;
8544 if ((o->size % bed->s->sizeof_rela) == 0)
8546 if ((o->size % bed->s->sizeof_rel) == 0)
8547 /* Section size is divisible by both rel and rela sizes.
8548 It is of no help to us. */
8552 /* Section size is only divisible by rela. */
8553 if (use_rela_initialised && (use_rela == FALSE))
8556 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8557 bfd_set_error (bfd_error_invalid_operation);
8563 use_rela_initialised = TRUE;
8567 else if ((o->size % bed->s->sizeof_rel) == 0)
8569 /* Section size is only divisible by rel. */
8570 if (use_rela_initialised && (use_rela == TRUE))
8573 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8574 bfd_set_error (bfd_error_invalid_operation);
8580 use_rela_initialised = TRUE;
8585 /* The section size is not divisible by either - something is wrong. */
8587 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8588 bfd_set_error (bfd_error_invalid_operation);
8593 if (! use_rela_initialised)
8597 else if (rela_dyn != NULL && rela_dyn->size > 0)
8599 else if (rel_dyn != NULL && rel_dyn->size > 0)
8606 dynamic_relocs = rela_dyn;
8607 ext_size = bed->s->sizeof_rela;
8608 swap_in = bed->s->swap_reloca_in;
8609 swap_out = bed->s->swap_reloca_out;
8613 dynamic_relocs = rel_dyn;
8614 ext_size = bed->s->sizeof_rel;
8615 swap_in = bed->s->swap_reloc_in;
8616 swap_out = bed->s->swap_reloc_out;
8620 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8621 if (lo->type == bfd_indirect_link_order)
8622 size += lo->u.indirect.section->size;
8624 if (size != dynamic_relocs->size)
8627 sort_elt = (sizeof (struct elf_link_sort_rela)
8628 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8630 count = dynamic_relocs->size / ext_size;
8633 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8637 (*info->callbacks->warning)
8638 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8642 if (bed->s->arch_size == 32)
8643 r_sym_mask = ~(bfd_vma) 0xff;
8645 r_sym_mask = ~(bfd_vma) 0xffffffff;
8647 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8648 if (lo->type == bfd_indirect_link_order)
8650 bfd_byte *erel, *erelend;
8651 asection *o = lo->u.indirect.section;
8653 if (o->contents == NULL && o->size != 0)
8655 /* This is a reloc section that is being handled as a normal
8656 section. See bfd_section_from_shdr. We can't combine
8657 relocs in this case. */
8662 erelend = o->contents + o->size;
8663 /* FIXME: octets_per_byte. */
8664 p = sort + o->output_offset / ext_size * sort_elt;
8666 while (erel < erelend)
8668 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8670 (*swap_in) (abfd, erel, s->rela);
8671 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8672 s->u.sym_mask = r_sym_mask;
8678 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8680 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8682 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8683 if (s->type != reloc_class_relative)
8689 sq = (struct elf_link_sort_rela *) s_non_relative;
8690 for (; i < count; i++, p += sort_elt)
8692 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8693 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8695 sp->u.offset = sq->rela->r_offset;
8698 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8700 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8701 if (lo->type == bfd_indirect_link_order)
8703 bfd_byte *erel, *erelend;
8704 asection *o = lo->u.indirect.section;
8707 erelend = o->contents + o->size;
8708 /* FIXME: octets_per_byte. */
8709 p = sort + o->output_offset / ext_size * sort_elt;
8710 while (erel < erelend)
8712 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8713 (*swap_out) (abfd, s->rela, erel);
8720 *psec = dynamic_relocs;
8724 /* Add a symbol to the output symbol string table. */
8727 elf_link_output_symstrtab (struct elf_final_link_info *flinfo,
8729 Elf_Internal_Sym *elfsym,
8730 asection *input_sec,
8731 struct elf_link_hash_entry *h)
8733 int (*output_symbol_hook)
8734 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8735 struct elf_link_hash_entry *);
8736 struct elf_link_hash_table *hash_table;
8737 const struct elf_backend_data *bed;
8738 bfd_size_type strtabsize;
8740 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8742 bed = get_elf_backend_data (flinfo->output_bfd);
8743 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8744 if (output_symbol_hook != NULL)
8746 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8753 || (input_sec->flags & SEC_EXCLUDE))
8754 elfsym->st_name = (unsigned long) -1;
8757 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
8758 to get the final offset for st_name. */
8760 = (unsigned long) _bfd_elf_strtab_add (flinfo->symstrtab,
8762 if (elfsym->st_name == (unsigned long) -1)
8766 hash_table = elf_hash_table (flinfo->info);
8767 strtabsize = hash_table->strtabsize;
8768 if (strtabsize <= hash_table->strtabcount)
8770 strtabsize += strtabsize;
8771 hash_table->strtabsize = strtabsize;
8772 strtabsize *= sizeof (*hash_table->strtab);
8774 = (struct elf_sym_strtab *) bfd_realloc (hash_table->strtab,
8776 if (hash_table->strtab == NULL)
8779 hash_table->strtab[hash_table->strtabcount].sym = *elfsym;
8780 hash_table->strtab[hash_table->strtabcount].dest_index
8781 = hash_table->strtabcount;
8782 hash_table->strtab[hash_table->strtabcount].destshndx_index
8783 = flinfo->symshndxbuf ? bfd_get_symcount (flinfo->output_bfd) : 0;
8785 bfd_get_symcount (flinfo->output_bfd) += 1;
8786 hash_table->strtabcount += 1;
8791 /* Swap symbols out to the symbol table and flush the output symbols to
8795 elf_link_swap_symbols_out (struct elf_final_link_info *flinfo)
8797 struct elf_link_hash_table *hash_table = elf_hash_table (flinfo->info);
8798 bfd_size_type amt, i;
8799 const struct elf_backend_data *bed;
8801 Elf_Internal_Shdr *hdr;
8805 if (!hash_table->strtabcount)
8808 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8810 bed = get_elf_backend_data (flinfo->output_bfd);
8812 amt = bed->s->sizeof_sym * hash_table->strtabcount;
8813 symbuf = (bfd_byte *) bfd_malloc (amt);
8817 if (flinfo->symshndxbuf)
8819 amt = (sizeof (Elf_External_Sym_Shndx)
8820 * (bfd_get_symcount (flinfo->output_bfd)));
8821 flinfo->symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
8822 if (flinfo->symshndxbuf == NULL)
8829 for (i = 0; i < hash_table->strtabcount; i++)
8831 struct elf_sym_strtab *elfsym = &hash_table->strtab[i];
8832 if (elfsym->sym.st_name == (unsigned long) -1)
8833 elfsym->sym.st_name = 0;
8836 = (unsigned long) _bfd_elf_strtab_offset (flinfo->symstrtab,
8837 elfsym->sym.st_name);
8838 bed->s->swap_symbol_out (flinfo->output_bfd, &elfsym->sym,
8839 ((bfd_byte *) symbuf
8840 + (elfsym->dest_index
8841 * bed->s->sizeof_sym)),
8842 (flinfo->symshndxbuf
8843 + elfsym->destshndx_index));
8846 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8847 pos = hdr->sh_offset + hdr->sh_size;
8848 amt = hash_table->strtabcount * bed->s->sizeof_sym;
8849 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) == 0
8850 && bfd_bwrite (symbuf, amt, flinfo->output_bfd) == amt)
8852 hdr->sh_size += amt;
8860 free (hash_table->strtab);
8861 hash_table->strtab = NULL;
8866 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8869 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8871 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8872 && sym->st_shndx < SHN_LORESERVE)
8874 /* The gABI doesn't support dynamic symbols in output sections
8876 (*_bfd_error_handler)
8877 (_("%B: Too many sections: %d (>= %d)"),
8878 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8879 bfd_set_error (bfd_error_nonrepresentable_section);
8885 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8886 allowing an unsatisfied unversioned symbol in the DSO to match a
8887 versioned symbol that would normally require an explicit version.
8888 We also handle the case that a DSO references a hidden symbol
8889 which may be satisfied by a versioned symbol in another DSO. */
8892 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8893 const struct elf_backend_data *bed,
8894 struct elf_link_hash_entry *h)
8897 struct elf_link_loaded_list *loaded;
8899 if (!is_elf_hash_table (info->hash))
8902 /* Check indirect symbol. */
8903 while (h->root.type == bfd_link_hash_indirect)
8904 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8906 switch (h->root.type)
8912 case bfd_link_hash_undefined:
8913 case bfd_link_hash_undefweak:
8914 abfd = h->root.u.undef.abfd;
8915 if ((abfd->flags & DYNAMIC) == 0
8916 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8920 case bfd_link_hash_defined:
8921 case bfd_link_hash_defweak:
8922 abfd = h->root.u.def.section->owner;
8925 case bfd_link_hash_common:
8926 abfd = h->root.u.c.p->section->owner;
8929 BFD_ASSERT (abfd != NULL);
8931 for (loaded = elf_hash_table (info)->loaded;
8933 loaded = loaded->next)
8936 Elf_Internal_Shdr *hdr;
8937 bfd_size_type symcount;
8938 bfd_size_type extsymcount;
8939 bfd_size_type extsymoff;
8940 Elf_Internal_Shdr *versymhdr;
8941 Elf_Internal_Sym *isym;
8942 Elf_Internal_Sym *isymend;
8943 Elf_Internal_Sym *isymbuf;
8944 Elf_External_Versym *ever;
8945 Elf_External_Versym *extversym;
8947 input = loaded->abfd;
8949 /* We check each DSO for a possible hidden versioned definition. */
8951 || (input->flags & DYNAMIC) == 0
8952 || elf_dynversym (input) == 0)
8955 hdr = &elf_tdata (input)->dynsymtab_hdr;
8957 symcount = hdr->sh_size / bed->s->sizeof_sym;
8958 if (elf_bad_symtab (input))
8960 extsymcount = symcount;
8965 extsymcount = symcount - hdr->sh_info;
8966 extsymoff = hdr->sh_info;
8969 if (extsymcount == 0)
8972 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8974 if (isymbuf == NULL)
8977 /* Read in any version definitions. */
8978 versymhdr = &elf_tdata (input)->dynversym_hdr;
8979 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8980 if (extversym == NULL)
8983 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8984 || (bfd_bread (extversym, versymhdr->sh_size, input)
8985 != versymhdr->sh_size))
8993 ever = extversym + extsymoff;
8994 isymend = isymbuf + extsymcount;
8995 for (isym = isymbuf; isym < isymend; isym++, ever++)
8998 Elf_Internal_Versym iver;
8999 unsigned short version_index;
9001 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
9002 || isym->st_shndx == SHN_UNDEF)
9005 name = bfd_elf_string_from_elf_section (input,
9008 if (strcmp (name, h->root.root.string) != 0)
9011 _bfd_elf_swap_versym_in (input, ever, &iver);
9013 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
9015 && h->forced_local))
9017 /* If we have a non-hidden versioned sym, then it should
9018 have provided a definition for the undefined sym unless
9019 it is defined in a non-shared object and forced local.
9024 version_index = iver.vs_vers & VERSYM_VERSION;
9025 if (version_index == 1 || version_index == 2)
9027 /* This is the base or first version. We can use it. */
9041 /* Add an external symbol to the symbol table. This is called from
9042 the hash table traversal routine. When generating a shared object,
9043 we go through the symbol table twice. The first time we output
9044 anything that might have been forced to local scope in a version
9045 script. The second time we output the symbols that are still
9049 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
9051 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
9052 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
9053 struct elf_final_link_info *flinfo = eoinfo->flinfo;
9055 Elf_Internal_Sym sym;
9056 asection *input_sec;
9057 const struct elf_backend_data *bed;
9060 /* A symbol is bound locally if it is forced local or it is locally
9061 defined, hidden versioned, not referenced by shared library and
9062 not exported when linking executable. */
9063 bfd_boolean local_bind = (h->forced_local
9064 || (bfd_link_executable (flinfo->info)
9065 && !flinfo->info->export_dynamic
9069 && h->versioned == versioned_hidden));
9071 if (h->root.type == bfd_link_hash_warning)
9073 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9074 if (h->root.type == bfd_link_hash_new)
9078 /* Decide whether to output this symbol in this pass. */
9079 if (eoinfo->localsyms)
9090 bed = get_elf_backend_data (flinfo->output_bfd);
9092 if (h->root.type == bfd_link_hash_undefined)
9094 /* If we have an undefined symbol reference here then it must have
9095 come from a shared library that is being linked in. (Undefined
9096 references in regular files have already been handled unless
9097 they are in unreferenced sections which are removed by garbage
9099 bfd_boolean ignore_undef = FALSE;
9101 /* Some symbols may be special in that the fact that they're
9102 undefined can be safely ignored - let backend determine that. */
9103 if (bed->elf_backend_ignore_undef_symbol)
9104 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
9106 /* If we are reporting errors for this situation then do so now. */
9109 && (!h->ref_regular || flinfo->info->gc_sections)
9110 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
9111 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
9113 if (!(flinfo->info->callbacks->undefined_symbol
9114 (flinfo->info, h->root.root.string,
9115 h->ref_regular ? NULL : h->root.u.undef.abfd,
9117 (flinfo->info->unresolved_syms_in_shared_libs
9118 == RM_GENERATE_ERROR))))
9120 bfd_set_error (bfd_error_bad_value);
9121 eoinfo->failed = TRUE;
9127 /* We should also warn if a forced local symbol is referenced from
9128 shared libraries. */
9129 if (bfd_link_executable (flinfo->info)
9134 && h->ref_dynamic_nonweak
9135 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
9139 struct elf_link_hash_entry *hi = h;
9141 /* Check indirect symbol. */
9142 while (hi->root.type == bfd_link_hash_indirect)
9143 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
9145 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
9146 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
9147 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
9148 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
9150 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
9151 def_bfd = flinfo->output_bfd;
9152 if (hi->root.u.def.section != bfd_abs_section_ptr)
9153 def_bfd = hi->root.u.def.section->owner;
9154 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
9155 h->root.root.string);
9156 bfd_set_error (bfd_error_bad_value);
9157 eoinfo->failed = TRUE;
9161 /* We don't want to output symbols that have never been mentioned by
9162 a regular file, or that we have been told to strip. However, if
9163 h->indx is set to -2, the symbol is used by a reloc and we must
9168 else if ((h->def_dynamic
9170 || h->root.type == bfd_link_hash_new)
9174 else if (flinfo->info->strip == strip_all)
9176 else if (flinfo->info->strip == strip_some
9177 && bfd_hash_lookup (flinfo->info->keep_hash,
9178 h->root.root.string, FALSE, FALSE) == NULL)
9180 else if ((h->root.type == bfd_link_hash_defined
9181 || h->root.type == bfd_link_hash_defweak)
9182 && ((flinfo->info->strip_discarded
9183 && discarded_section (h->root.u.def.section))
9184 || ((h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0
9185 && h->root.u.def.section->owner != NULL
9186 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
9188 else if ((h->root.type == bfd_link_hash_undefined
9189 || h->root.type == bfd_link_hash_undefweak)
9190 && h->root.u.undef.abfd != NULL
9191 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
9194 /* If we're stripping it, and it's not a dynamic symbol, there's
9195 nothing else to do. However, if it is a forced local symbol or
9196 an ifunc symbol we need to give the backend finish_dynamic_symbol
9197 function a chance to make it dynamic. */
9200 && h->type != STT_GNU_IFUNC
9201 && !h->forced_local)
9205 sym.st_size = h->size;
9206 sym.st_other = h->other;
9209 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
9210 /* Turn off visibility on local symbol. */
9211 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
9213 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
9214 else if (h->unique_global && h->def_regular)
9215 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
9216 else if (h->root.type == bfd_link_hash_undefweak
9217 || h->root.type == bfd_link_hash_defweak)
9218 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
9220 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
9221 sym.st_target_internal = h->target_internal;
9223 switch (h->root.type)
9226 case bfd_link_hash_new:
9227 case bfd_link_hash_warning:
9231 case bfd_link_hash_undefined:
9232 case bfd_link_hash_undefweak:
9233 input_sec = bfd_und_section_ptr;
9234 sym.st_shndx = SHN_UNDEF;
9237 case bfd_link_hash_defined:
9238 case bfd_link_hash_defweak:
9240 input_sec = h->root.u.def.section;
9241 if (input_sec->output_section != NULL)
9244 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
9245 input_sec->output_section);
9246 if (sym.st_shndx == SHN_BAD)
9248 (*_bfd_error_handler)
9249 (_("%B: could not find output section %A for input section %A"),
9250 flinfo->output_bfd, input_sec->output_section, input_sec);
9251 bfd_set_error (bfd_error_nonrepresentable_section);
9252 eoinfo->failed = TRUE;
9256 /* ELF symbols in relocatable files are section relative,
9257 but in nonrelocatable files they are virtual
9259 sym.st_value = h->root.u.def.value + input_sec->output_offset;
9260 if (!bfd_link_relocatable (flinfo->info))
9262 sym.st_value += input_sec->output_section->vma;
9263 if (h->type == STT_TLS)
9265 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
9266 if (tls_sec != NULL)
9267 sym.st_value -= tls_sec->vma;
9273 BFD_ASSERT (input_sec->owner == NULL
9274 || (input_sec->owner->flags & DYNAMIC) != 0);
9275 sym.st_shndx = SHN_UNDEF;
9276 input_sec = bfd_und_section_ptr;
9281 case bfd_link_hash_common:
9282 input_sec = h->root.u.c.p->section;
9283 sym.st_shndx = bed->common_section_index (input_sec);
9284 sym.st_value = 1 << h->root.u.c.p->alignment_power;
9287 case bfd_link_hash_indirect:
9288 /* These symbols are created by symbol versioning. They point
9289 to the decorated version of the name. For example, if the
9290 symbol foo@@GNU_1.2 is the default, which should be used when
9291 foo is used with no version, then we add an indirect symbol
9292 foo which points to foo@@GNU_1.2. We ignore these symbols,
9293 since the indirected symbol is already in the hash table. */
9297 /* Give the processor backend a chance to tweak the symbol value,
9298 and also to finish up anything that needs to be done for this
9299 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
9300 forced local syms when non-shared is due to a historical quirk.
9301 STT_GNU_IFUNC symbol must go through PLT. */
9302 if ((h->type == STT_GNU_IFUNC
9304 && !bfd_link_relocatable (flinfo->info))
9305 || ((h->dynindx != -1
9307 && ((bfd_link_pic (flinfo->info)
9308 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
9309 || h->root.type != bfd_link_hash_undefweak))
9310 || !h->forced_local)
9311 && elf_hash_table (flinfo->info)->dynamic_sections_created))
9313 if (! ((*bed->elf_backend_finish_dynamic_symbol)
9314 (flinfo->output_bfd, flinfo->info, h, &sym)))
9316 eoinfo->failed = TRUE;
9321 /* If we are marking the symbol as undefined, and there are no
9322 non-weak references to this symbol from a regular object, then
9323 mark the symbol as weak undefined; if there are non-weak
9324 references, mark the symbol as strong. We can't do this earlier,
9325 because it might not be marked as undefined until the
9326 finish_dynamic_symbol routine gets through with it. */
9327 if (sym.st_shndx == SHN_UNDEF
9329 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
9330 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
9333 unsigned int type = ELF_ST_TYPE (sym.st_info);
9335 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
9336 if (type == STT_GNU_IFUNC)
9339 if (h->ref_regular_nonweak)
9340 bindtype = STB_GLOBAL;
9342 bindtype = STB_WEAK;
9343 sym.st_info = ELF_ST_INFO (bindtype, type);
9346 /* If this is a symbol defined in a dynamic library, don't use the
9347 symbol size from the dynamic library. Relinking an executable
9348 against a new library may introduce gratuitous changes in the
9349 executable's symbols if we keep the size. */
9350 if (sym.st_shndx == SHN_UNDEF
9355 /* If a non-weak symbol with non-default visibility is not defined
9356 locally, it is a fatal error. */
9357 if (!bfd_link_relocatable (flinfo->info)
9358 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
9359 && ELF_ST_BIND (sym.st_info) != STB_WEAK
9360 && h->root.type == bfd_link_hash_undefined
9365 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
9366 msg = _("%B: protected symbol `%s' isn't defined");
9367 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
9368 msg = _("%B: internal symbol `%s' isn't defined");
9370 msg = _("%B: hidden symbol `%s' isn't defined");
9371 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
9372 bfd_set_error (bfd_error_bad_value);
9373 eoinfo->failed = TRUE;
9377 /* If this symbol should be put in the .dynsym section, then put it
9378 there now. We already know the symbol index. We also fill in
9379 the entry in the .hash section. */
9380 if (elf_hash_table (flinfo->info)->dynsym != NULL
9382 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9386 /* Since there is no version information in the dynamic string,
9387 if there is no version info in symbol version section, we will
9388 have a run-time problem if not linking executable, referenced
9389 by shared library, not locally defined, or not bound locally.
9391 if (h->verinfo.verdef == NULL
9393 && (!bfd_link_executable (flinfo->info)
9395 || !h->def_regular))
9397 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9399 if (p && p [1] != '\0')
9401 (*_bfd_error_handler)
9402 (_("%B: No symbol version section for versioned symbol `%s'"),
9403 flinfo->output_bfd, h->root.root.string);
9404 eoinfo->failed = TRUE;
9409 sym.st_name = h->dynstr_index;
9410 esym = (elf_hash_table (flinfo->info)->dynsym->contents
9411 + h->dynindx * bed->s->sizeof_sym);
9412 if (!check_dynsym (flinfo->output_bfd, &sym))
9414 eoinfo->failed = TRUE;
9417 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9419 if (flinfo->hash_sec != NULL)
9421 size_t hash_entry_size;
9422 bfd_byte *bucketpos;
9427 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9428 bucket = h->u.elf_hash_value % bucketcount;
9431 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9432 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9433 + (bucket + 2) * hash_entry_size);
9434 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9435 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9437 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9438 ((bfd_byte *) flinfo->hash_sec->contents
9439 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9442 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9444 Elf_Internal_Versym iversym;
9445 Elf_External_Versym *eversym;
9447 if (!h->def_regular)
9449 if (h->verinfo.verdef == NULL
9450 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
9451 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
9452 iversym.vs_vers = 0;
9454 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9458 if (h->verinfo.vertree == NULL)
9459 iversym.vs_vers = 1;
9461 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9462 if (flinfo->info->create_default_symver)
9466 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
9468 if (h->versioned == versioned_hidden && h->def_regular)
9469 iversym.vs_vers |= VERSYM_HIDDEN;
9471 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9472 eversym += h->dynindx;
9473 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9477 /* If the symbol is undefined, and we didn't output it to .dynsym,
9478 strip it from .symtab too. Obviously we can't do this for
9479 relocatable output or when needed for --emit-relocs. */
9480 else if (input_sec == bfd_und_section_ptr
9482 && !bfd_link_relocatable (flinfo->info))
9484 /* Also strip others that we couldn't earlier due to dynamic symbol
9488 if ((input_sec->flags & SEC_EXCLUDE) != 0)
9491 /* Output a FILE symbol so that following locals are not associated
9492 with the wrong input file. We need one for forced local symbols
9493 if we've seen more than one FILE symbol or when we have exactly
9494 one FILE symbol but global symbols are present in a file other
9495 than the one with the FILE symbol. We also need one if linker
9496 defined symbols are present. In practice these conditions are
9497 always met, so just emit the FILE symbol unconditionally. */
9498 if (eoinfo->localsyms
9499 && !eoinfo->file_sym_done
9500 && eoinfo->flinfo->filesym_count != 0)
9502 Elf_Internal_Sym fsym;
9504 memset (&fsym, 0, sizeof (fsym));
9505 fsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9506 fsym.st_shndx = SHN_ABS;
9507 if (!elf_link_output_symstrtab (eoinfo->flinfo, NULL, &fsym,
9508 bfd_und_section_ptr, NULL))
9511 eoinfo->file_sym_done = TRUE;
9514 indx = bfd_get_symcount (flinfo->output_bfd);
9515 ret = elf_link_output_symstrtab (flinfo, h->root.root.string, &sym,
9519 eoinfo->failed = TRUE;
9524 else if (h->indx == -2)
9530 /* Return TRUE if special handling is done for relocs in SEC against
9531 symbols defined in discarded sections. */
9534 elf_section_ignore_discarded_relocs (asection *sec)
9536 const struct elf_backend_data *bed;
9538 switch (sec->sec_info_type)
9540 case SEC_INFO_TYPE_STABS:
9541 case SEC_INFO_TYPE_EH_FRAME:
9542 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
9548 bed = get_elf_backend_data (sec->owner);
9549 if (bed->elf_backend_ignore_discarded_relocs != NULL
9550 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9556 /* Return a mask saying how ld should treat relocations in SEC against
9557 symbols defined in discarded sections. If this function returns
9558 COMPLAIN set, ld will issue a warning message. If this function
9559 returns PRETEND set, and the discarded section was link-once and the
9560 same size as the kept link-once section, ld will pretend that the
9561 symbol was actually defined in the kept section. Otherwise ld will
9562 zero the reloc (at least that is the intent, but some cooperation by
9563 the target dependent code is needed, particularly for REL targets). */
9566 _bfd_elf_default_action_discarded (asection *sec)
9568 if (sec->flags & SEC_DEBUGGING)
9571 if (strcmp (".eh_frame", sec->name) == 0)
9574 if (strcmp (".gcc_except_table", sec->name) == 0)
9577 return COMPLAIN | PRETEND;
9580 /* Find a match between a section and a member of a section group. */
9583 match_group_member (asection *sec, asection *group,
9584 struct bfd_link_info *info)
9586 asection *first = elf_next_in_group (group);
9587 asection *s = first;
9591 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9594 s = elf_next_in_group (s);
9602 /* Check if the kept section of a discarded section SEC can be used
9603 to replace it. Return the replacement if it is OK. Otherwise return
9607 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9611 kept = sec->kept_section;
9614 if ((kept->flags & SEC_GROUP) != 0)
9615 kept = match_group_member (sec, kept, info);
9617 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9618 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9620 sec->kept_section = kept;
9625 /* Link an input file into the linker output file. This function
9626 handles all the sections and relocations of the input file at once.
9627 This is so that we only have to read the local symbols once, and
9628 don't have to keep them in memory. */
9631 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9633 int (*relocate_section)
9634 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9635 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9637 Elf_Internal_Shdr *symtab_hdr;
9640 Elf_Internal_Sym *isymbuf;
9641 Elf_Internal_Sym *isym;
9642 Elf_Internal_Sym *isymend;
9644 asection **ppsection;
9646 const struct elf_backend_data *bed;
9647 struct elf_link_hash_entry **sym_hashes;
9648 bfd_size_type address_size;
9649 bfd_vma r_type_mask;
9651 bfd_boolean have_file_sym = FALSE;
9653 output_bfd = flinfo->output_bfd;
9654 bed = get_elf_backend_data (output_bfd);
9655 relocate_section = bed->elf_backend_relocate_section;
9657 /* If this is a dynamic object, we don't want to do anything here:
9658 we don't want the local symbols, and we don't want the section
9660 if ((input_bfd->flags & DYNAMIC) != 0)
9663 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9664 if (elf_bad_symtab (input_bfd))
9666 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9671 locsymcount = symtab_hdr->sh_info;
9672 extsymoff = symtab_hdr->sh_info;
9675 /* Read the local symbols. */
9676 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9677 if (isymbuf == NULL && locsymcount != 0)
9679 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9680 flinfo->internal_syms,
9681 flinfo->external_syms,
9682 flinfo->locsym_shndx);
9683 if (isymbuf == NULL)
9687 /* Find local symbol sections and adjust values of symbols in
9688 SEC_MERGE sections. Write out those local symbols we know are
9689 going into the output file. */
9690 isymend = isymbuf + locsymcount;
9691 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9693 isym++, pindex++, ppsection++)
9697 Elf_Internal_Sym osym;
9703 if (elf_bad_symtab (input_bfd))
9705 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9712 if (isym->st_shndx == SHN_UNDEF)
9713 isec = bfd_und_section_ptr;
9714 else if (isym->st_shndx == SHN_ABS)
9715 isec = bfd_abs_section_ptr;
9716 else if (isym->st_shndx == SHN_COMMON)
9717 isec = bfd_com_section_ptr;
9720 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9723 /* Don't attempt to output symbols with st_shnx in the
9724 reserved range other than SHN_ABS and SHN_COMMON. */
9728 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9729 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9731 _bfd_merged_section_offset (output_bfd, &isec,
9732 elf_section_data (isec)->sec_info,
9738 /* Don't output the first, undefined, symbol. In fact, don't
9739 output any undefined local symbol. */
9740 if (isec == bfd_und_section_ptr)
9743 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9745 /* We never output section symbols. Instead, we use the
9746 section symbol of the corresponding section in the output
9751 /* If we are stripping all symbols, we don't want to output this
9753 if (flinfo->info->strip == strip_all)
9756 /* If we are discarding all local symbols, we don't want to
9757 output this one. If we are generating a relocatable output
9758 file, then some of the local symbols may be required by
9759 relocs; we output them below as we discover that they are
9761 if (flinfo->info->discard == discard_all)
9764 /* If this symbol is defined in a section which we are
9765 discarding, we don't need to keep it. */
9766 if (isym->st_shndx != SHN_UNDEF
9767 && isym->st_shndx < SHN_LORESERVE
9768 && bfd_section_removed_from_list (output_bfd,
9769 isec->output_section))
9772 /* Get the name of the symbol. */
9773 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9778 /* See if we are discarding symbols with this name. */
9779 if ((flinfo->info->strip == strip_some
9780 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9782 || (((flinfo->info->discard == discard_sec_merge
9783 && (isec->flags & SEC_MERGE)
9784 && !bfd_link_relocatable (flinfo->info))
9785 || flinfo->info->discard == discard_l)
9786 && bfd_is_local_label_name (input_bfd, name)))
9789 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9791 if (input_bfd->lto_output)
9792 /* -flto puts a temp file name here. This means builds
9793 are not reproducible. Discard the symbol. */
9795 have_file_sym = TRUE;
9796 flinfo->filesym_count += 1;
9800 /* In the absence of debug info, bfd_find_nearest_line uses
9801 FILE symbols to determine the source file for local
9802 function symbols. Provide a FILE symbol here if input
9803 files lack such, so that their symbols won't be
9804 associated with a previous input file. It's not the
9805 source file, but the best we can do. */
9806 have_file_sym = TRUE;
9807 flinfo->filesym_count += 1;
9808 memset (&osym, 0, sizeof (osym));
9809 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9810 osym.st_shndx = SHN_ABS;
9811 if (!elf_link_output_symstrtab (flinfo,
9812 (input_bfd->lto_output ? NULL
9813 : input_bfd->filename),
9814 &osym, bfd_abs_section_ptr,
9821 /* Adjust the section index for the output file. */
9822 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9823 isec->output_section);
9824 if (osym.st_shndx == SHN_BAD)
9827 /* ELF symbols in relocatable files are section relative, but
9828 in executable files they are virtual addresses. Note that
9829 this code assumes that all ELF sections have an associated
9830 BFD section with a reasonable value for output_offset; below
9831 we assume that they also have a reasonable value for
9832 output_section. Any special sections must be set up to meet
9833 these requirements. */
9834 osym.st_value += isec->output_offset;
9835 if (!bfd_link_relocatable (flinfo->info))
9837 osym.st_value += isec->output_section->vma;
9838 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9840 /* STT_TLS symbols are relative to PT_TLS segment base. */
9841 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9842 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9846 indx = bfd_get_symcount (output_bfd);
9847 ret = elf_link_output_symstrtab (flinfo, name, &osym, isec, NULL);
9854 if (bed->s->arch_size == 32)
9862 r_type_mask = 0xffffffff;
9867 /* Relocate the contents of each section. */
9868 sym_hashes = elf_sym_hashes (input_bfd);
9869 for (o = input_bfd->sections; o != NULL; o = o->next)
9873 if (! o->linker_mark)
9875 /* This section was omitted from the link. */
9879 if (bfd_link_relocatable (flinfo->info)
9880 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9882 /* Deal with the group signature symbol. */
9883 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9884 unsigned long symndx = sec_data->this_hdr.sh_info;
9885 asection *osec = o->output_section;
9887 if (symndx >= locsymcount
9888 || (elf_bad_symtab (input_bfd)
9889 && flinfo->sections[symndx] == NULL))
9891 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9892 while (h->root.type == bfd_link_hash_indirect
9893 || h->root.type == bfd_link_hash_warning)
9894 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9895 /* Arrange for symbol to be output. */
9897 elf_section_data (osec)->this_hdr.sh_info = -2;
9899 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9901 /* We'll use the output section target_index. */
9902 asection *sec = flinfo->sections[symndx]->output_section;
9903 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9907 if (flinfo->indices[symndx] == -1)
9909 /* Otherwise output the local symbol now. */
9910 Elf_Internal_Sym sym = isymbuf[symndx];
9911 asection *sec = flinfo->sections[symndx]->output_section;
9916 name = bfd_elf_string_from_elf_section (input_bfd,
9917 symtab_hdr->sh_link,
9922 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9924 if (sym.st_shndx == SHN_BAD)
9927 sym.st_value += o->output_offset;
9929 indx = bfd_get_symcount (output_bfd);
9930 ret = elf_link_output_symstrtab (flinfo, name, &sym, o,
9935 flinfo->indices[symndx] = indx;
9939 elf_section_data (osec)->this_hdr.sh_info
9940 = flinfo->indices[symndx];
9944 if ((o->flags & SEC_HAS_CONTENTS) == 0
9945 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9948 if ((o->flags & SEC_LINKER_CREATED) != 0)
9950 /* Section was created by _bfd_elf_link_create_dynamic_sections
9955 /* Get the contents of the section. They have been cached by a
9956 relaxation routine. Note that o is a section in an input
9957 file, so the contents field will not have been set by any of
9958 the routines which work on output files. */
9959 if (elf_section_data (o)->this_hdr.contents != NULL)
9961 contents = elf_section_data (o)->this_hdr.contents;
9962 if (bed->caches_rawsize
9964 && o->rawsize < o->size)
9966 memcpy (flinfo->contents, contents, o->rawsize);
9967 contents = flinfo->contents;
9972 contents = flinfo->contents;
9973 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9977 if ((o->flags & SEC_RELOC) != 0)
9979 Elf_Internal_Rela *internal_relocs;
9980 Elf_Internal_Rela *rel, *relend;
9981 int action_discarded;
9984 /* Get the swapped relocs. */
9986 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
9987 flinfo->internal_relocs, FALSE);
9988 if (internal_relocs == NULL
9989 && o->reloc_count > 0)
9992 /* We need to reverse-copy input .ctors/.dtors sections if
9993 they are placed in .init_array/.finit_array for output. */
9994 if (o->size > address_size
9995 && ((strncmp (o->name, ".ctors", 6) == 0
9996 && strcmp (o->output_section->name,
9997 ".init_array") == 0)
9998 || (strncmp (o->name, ".dtors", 6) == 0
9999 && strcmp (o->output_section->name,
10000 ".fini_array") == 0))
10001 && (o->name[6] == 0 || o->name[6] == '.'))
10003 if (o->size != o->reloc_count * address_size)
10005 (*_bfd_error_handler)
10006 (_("error: %B: size of section %A is not "
10007 "multiple of address size"),
10009 bfd_set_error (bfd_error_on_input);
10012 o->flags |= SEC_ELF_REVERSE_COPY;
10015 action_discarded = -1;
10016 if (!elf_section_ignore_discarded_relocs (o))
10017 action_discarded = (*bed->action_discarded) (o);
10019 /* Run through the relocs evaluating complex reloc symbols and
10020 looking for relocs against symbols from discarded sections
10021 or section symbols from removed link-once sections.
10022 Complain about relocs against discarded sections. Zero
10023 relocs against removed link-once sections. */
10025 rel = internal_relocs;
10026 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
10027 for ( ; rel < relend; rel++)
10029 unsigned long r_symndx = rel->r_info >> r_sym_shift;
10030 unsigned int s_type;
10031 asection **ps, *sec;
10032 struct elf_link_hash_entry *h = NULL;
10033 const char *sym_name;
10035 if (r_symndx == STN_UNDEF)
10038 if (r_symndx >= locsymcount
10039 || (elf_bad_symtab (input_bfd)
10040 && flinfo->sections[r_symndx] == NULL))
10042 h = sym_hashes[r_symndx - extsymoff];
10044 /* Badly formatted input files can contain relocs that
10045 reference non-existant symbols. Check here so that
10046 we do not seg fault. */
10051 sprintf_vma (buffer, rel->r_info);
10052 (*_bfd_error_handler)
10053 (_("error: %B contains a reloc (0x%s) for section %A "
10054 "that references a non-existent global symbol"),
10055 input_bfd, o, buffer);
10056 bfd_set_error (bfd_error_bad_value);
10060 while (h->root.type == bfd_link_hash_indirect
10061 || h->root.type == bfd_link_hash_warning)
10062 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10066 /* If a plugin symbol is referenced from a non-IR file,
10067 mark the symbol as undefined. Note that the
10068 linker may attach linker created dynamic sections
10069 to the plugin bfd. Symbols defined in linker
10070 created sections are not plugin symbols. */
10071 if (h->root.non_ir_ref
10072 && (h->root.type == bfd_link_hash_defined
10073 || h->root.type == bfd_link_hash_defweak)
10074 && (h->root.u.def.section->flags
10075 & SEC_LINKER_CREATED) == 0
10076 && h->root.u.def.section->owner != NULL
10077 && (h->root.u.def.section->owner->flags
10078 & BFD_PLUGIN) != 0)
10080 h->root.type = bfd_link_hash_undefined;
10081 h->root.u.undef.abfd = h->root.u.def.section->owner;
10085 if (h->root.type == bfd_link_hash_defined
10086 || h->root.type == bfd_link_hash_defweak)
10087 ps = &h->root.u.def.section;
10089 sym_name = h->root.root.string;
10093 Elf_Internal_Sym *sym = isymbuf + r_symndx;
10095 s_type = ELF_ST_TYPE (sym->st_info);
10096 ps = &flinfo->sections[r_symndx];
10097 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
10101 if ((s_type == STT_RELC || s_type == STT_SRELC)
10102 && !bfd_link_relocatable (flinfo->info))
10105 bfd_vma dot = (rel->r_offset
10106 + o->output_offset + o->output_section->vma);
10108 printf ("Encountered a complex symbol!");
10109 printf (" (input_bfd %s, section %s, reloc %ld\n",
10110 input_bfd->filename, o->name,
10111 (long) (rel - internal_relocs));
10112 printf (" symbol: idx %8.8lx, name %s\n",
10113 r_symndx, sym_name);
10114 printf (" reloc : info %8.8lx, addr %8.8lx\n",
10115 (unsigned long) rel->r_info,
10116 (unsigned long) rel->r_offset);
10118 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
10119 isymbuf, locsymcount, s_type == STT_SRELC))
10122 /* Symbol evaluated OK. Update to absolute value. */
10123 set_symbol_value (input_bfd, isymbuf, locsymcount,
10128 if (action_discarded != -1 && ps != NULL)
10130 /* Complain if the definition comes from a
10131 discarded section. */
10132 if ((sec = *ps) != NULL && discarded_section (sec))
10134 BFD_ASSERT (r_symndx != STN_UNDEF);
10135 if (action_discarded & COMPLAIN)
10136 (*flinfo->info->callbacks->einfo)
10137 (_("%X`%s' referenced in section `%A' of %B: "
10138 "defined in discarded section `%A' of %B\n"),
10139 sym_name, o, input_bfd, sec, sec->owner);
10141 /* Try to do the best we can to support buggy old
10142 versions of gcc. Pretend that the symbol is
10143 really defined in the kept linkonce section.
10144 FIXME: This is quite broken. Modifying the
10145 symbol here means we will be changing all later
10146 uses of the symbol, not just in this section. */
10147 if (action_discarded & PRETEND)
10151 kept = _bfd_elf_check_kept_section (sec,
10163 /* Relocate the section by invoking a back end routine.
10165 The back end routine is responsible for adjusting the
10166 section contents as necessary, and (if using Rela relocs
10167 and generating a relocatable output file) adjusting the
10168 reloc addend as necessary.
10170 The back end routine does not have to worry about setting
10171 the reloc address or the reloc symbol index.
10173 The back end routine is given a pointer to the swapped in
10174 internal symbols, and can access the hash table entries
10175 for the external symbols via elf_sym_hashes (input_bfd).
10177 When generating relocatable output, the back end routine
10178 must handle STB_LOCAL/STT_SECTION symbols specially. The
10179 output symbol is going to be a section symbol
10180 corresponding to the output section, which will require
10181 the addend to be adjusted. */
10183 ret = (*relocate_section) (output_bfd, flinfo->info,
10184 input_bfd, o, contents,
10192 || bfd_link_relocatable (flinfo->info)
10193 || flinfo->info->emitrelocations)
10195 Elf_Internal_Rela *irela;
10196 Elf_Internal_Rela *irelaend, *irelamid;
10197 bfd_vma last_offset;
10198 struct elf_link_hash_entry **rel_hash;
10199 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
10200 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
10201 unsigned int next_erel;
10202 bfd_boolean rela_normal;
10203 struct bfd_elf_section_data *esdi, *esdo;
10205 esdi = elf_section_data (o);
10206 esdo = elf_section_data (o->output_section);
10207 rela_normal = FALSE;
10209 /* Adjust the reloc addresses and symbol indices. */
10211 irela = internal_relocs;
10212 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
10213 rel_hash = esdo->rel.hashes + esdo->rel.count;
10214 /* We start processing the REL relocs, if any. When we reach
10215 IRELAMID in the loop, we switch to the RELA relocs. */
10217 if (esdi->rel.hdr != NULL)
10218 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
10219 * bed->s->int_rels_per_ext_rel);
10220 rel_hash_list = rel_hash;
10221 rela_hash_list = NULL;
10222 last_offset = o->output_offset;
10223 if (!bfd_link_relocatable (flinfo->info))
10224 last_offset += o->output_section->vma;
10225 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
10227 unsigned long r_symndx;
10229 Elf_Internal_Sym sym;
10231 if (next_erel == bed->s->int_rels_per_ext_rel)
10237 if (irela == irelamid)
10239 rel_hash = esdo->rela.hashes + esdo->rela.count;
10240 rela_hash_list = rel_hash;
10241 rela_normal = bed->rela_normal;
10244 irela->r_offset = _bfd_elf_section_offset (output_bfd,
10247 if (irela->r_offset >= (bfd_vma) -2)
10249 /* This is a reloc for a deleted entry or somesuch.
10250 Turn it into an R_*_NONE reloc, at the same
10251 offset as the last reloc. elf_eh_frame.c and
10252 bfd_elf_discard_info rely on reloc offsets
10254 irela->r_offset = last_offset;
10256 irela->r_addend = 0;
10260 irela->r_offset += o->output_offset;
10262 /* Relocs in an executable have to be virtual addresses. */
10263 if (!bfd_link_relocatable (flinfo->info))
10264 irela->r_offset += o->output_section->vma;
10266 last_offset = irela->r_offset;
10268 r_symndx = irela->r_info >> r_sym_shift;
10269 if (r_symndx == STN_UNDEF)
10272 if (r_symndx >= locsymcount
10273 || (elf_bad_symtab (input_bfd)
10274 && flinfo->sections[r_symndx] == NULL))
10276 struct elf_link_hash_entry *rh;
10277 unsigned long indx;
10279 /* This is a reloc against a global symbol. We
10280 have not yet output all the local symbols, so
10281 we do not know the symbol index of any global
10282 symbol. We set the rel_hash entry for this
10283 reloc to point to the global hash table entry
10284 for this symbol. The symbol index is then
10285 set at the end of bfd_elf_final_link. */
10286 indx = r_symndx - extsymoff;
10287 rh = elf_sym_hashes (input_bfd)[indx];
10288 while (rh->root.type == bfd_link_hash_indirect
10289 || rh->root.type == bfd_link_hash_warning)
10290 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
10292 /* Setting the index to -2 tells
10293 elf_link_output_extsym that this symbol is
10294 used by a reloc. */
10295 BFD_ASSERT (rh->indx < 0);
10303 /* This is a reloc against a local symbol. */
10306 sym = isymbuf[r_symndx];
10307 sec = flinfo->sections[r_symndx];
10308 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
10310 /* I suppose the backend ought to fill in the
10311 section of any STT_SECTION symbol against a
10312 processor specific section. */
10313 r_symndx = STN_UNDEF;
10314 if (bfd_is_abs_section (sec))
10316 else if (sec == NULL || sec->owner == NULL)
10318 bfd_set_error (bfd_error_bad_value);
10323 asection *osec = sec->output_section;
10325 /* If we have discarded a section, the output
10326 section will be the absolute section. In
10327 case of discarded SEC_MERGE sections, use
10328 the kept section. relocate_section should
10329 have already handled discarded linkonce
10331 if (bfd_is_abs_section (osec)
10332 && sec->kept_section != NULL
10333 && sec->kept_section->output_section != NULL)
10335 osec = sec->kept_section->output_section;
10336 irela->r_addend -= osec->vma;
10339 if (!bfd_is_abs_section (osec))
10341 r_symndx = osec->target_index;
10342 if (r_symndx == STN_UNDEF)
10344 irela->r_addend += osec->vma;
10345 osec = _bfd_nearby_section (output_bfd, osec,
10347 irela->r_addend -= osec->vma;
10348 r_symndx = osec->target_index;
10353 /* Adjust the addend according to where the
10354 section winds up in the output section. */
10356 irela->r_addend += sec->output_offset;
10360 if (flinfo->indices[r_symndx] == -1)
10362 unsigned long shlink;
10367 if (flinfo->info->strip == strip_all)
10369 /* You can't do ld -r -s. */
10370 bfd_set_error (bfd_error_invalid_operation);
10374 /* This symbol was skipped earlier, but
10375 since it is needed by a reloc, we
10376 must output it now. */
10377 shlink = symtab_hdr->sh_link;
10378 name = (bfd_elf_string_from_elf_section
10379 (input_bfd, shlink, sym.st_name));
10383 osec = sec->output_section;
10385 _bfd_elf_section_from_bfd_section (output_bfd,
10387 if (sym.st_shndx == SHN_BAD)
10390 sym.st_value += sec->output_offset;
10391 if (!bfd_link_relocatable (flinfo->info))
10393 sym.st_value += osec->vma;
10394 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
10396 /* STT_TLS symbols are relative to PT_TLS
10398 BFD_ASSERT (elf_hash_table (flinfo->info)
10399 ->tls_sec != NULL);
10400 sym.st_value -= (elf_hash_table (flinfo->info)
10405 indx = bfd_get_symcount (output_bfd);
10406 ret = elf_link_output_symstrtab (flinfo, name,
10412 flinfo->indices[r_symndx] = indx;
10417 r_symndx = flinfo->indices[r_symndx];
10420 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
10421 | (irela->r_info & r_type_mask));
10424 /* Swap out the relocs. */
10425 input_rel_hdr = esdi->rel.hdr;
10426 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
10428 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10433 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
10434 * bed->s->int_rels_per_ext_rel);
10435 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
10438 input_rela_hdr = esdi->rela.hdr;
10439 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
10441 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10450 /* Write out the modified section contents. */
10451 if (bed->elf_backend_write_section
10452 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
10455 /* Section written out. */
10457 else switch (o->sec_info_type)
10459 case SEC_INFO_TYPE_STABS:
10460 if (! (_bfd_write_section_stabs
10462 &elf_hash_table (flinfo->info)->stab_info,
10463 o, &elf_section_data (o)->sec_info, contents)))
10466 case SEC_INFO_TYPE_MERGE:
10467 if (! _bfd_write_merged_section (output_bfd, o,
10468 elf_section_data (o)->sec_info))
10471 case SEC_INFO_TYPE_EH_FRAME:
10473 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10478 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
10480 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd,
10488 /* FIXME: octets_per_byte. */
10489 if (! (o->flags & SEC_EXCLUDE))
10491 file_ptr offset = (file_ptr) o->output_offset;
10492 bfd_size_type todo = o->size;
10493 if ((o->flags & SEC_ELF_REVERSE_COPY))
10495 /* Reverse-copy input section to output. */
10498 todo -= address_size;
10499 if (! bfd_set_section_contents (output_bfd,
10507 offset += address_size;
10511 else if (! bfd_set_section_contents (output_bfd,
10525 /* Generate a reloc when linking an ELF file. This is a reloc
10526 requested by the linker, and does not come from any input file. This
10527 is used to build constructor and destructor tables when linking
10531 elf_reloc_link_order (bfd *output_bfd,
10532 struct bfd_link_info *info,
10533 asection *output_section,
10534 struct bfd_link_order *link_order)
10536 reloc_howto_type *howto;
10540 struct bfd_elf_section_reloc_data *reldata;
10541 struct elf_link_hash_entry **rel_hash_ptr;
10542 Elf_Internal_Shdr *rel_hdr;
10543 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10544 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10547 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10549 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10552 bfd_set_error (bfd_error_bad_value);
10556 addend = link_order->u.reloc.p->addend;
10559 reldata = &esdo->rel;
10560 else if (esdo->rela.hdr)
10561 reldata = &esdo->rela;
10568 /* Figure out the symbol index. */
10569 rel_hash_ptr = reldata->hashes + reldata->count;
10570 if (link_order->type == bfd_section_reloc_link_order)
10572 indx = link_order->u.reloc.p->u.section->target_index;
10573 BFD_ASSERT (indx != 0);
10574 *rel_hash_ptr = NULL;
10578 struct elf_link_hash_entry *h;
10580 /* Treat a reloc against a defined symbol as though it were
10581 actually against the section. */
10582 h = ((struct elf_link_hash_entry *)
10583 bfd_wrapped_link_hash_lookup (output_bfd, info,
10584 link_order->u.reloc.p->u.name,
10585 FALSE, FALSE, TRUE));
10587 && (h->root.type == bfd_link_hash_defined
10588 || h->root.type == bfd_link_hash_defweak))
10592 section = h->root.u.def.section;
10593 indx = section->output_section->target_index;
10594 *rel_hash_ptr = NULL;
10595 /* It seems that we ought to add the symbol value to the
10596 addend here, but in practice it has already been added
10597 because it was passed to constructor_callback. */
10598 addend += section->output_section->vma + section->output_offset;
10600 else if (h != NULL)
10602 /* Setting the index to -2 tells elf_link_output_extsym that
10603 this symbol is used by a reloc. */
10610 if (! ((*info->callbacks->unattached_reloc)
10611 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10617 /* If this is an inplace reloc, we must write the addend into the
10619 if (howto->partial_inplace && addend != 0)
10621 bfd_size_type size;
10622 bfd_reloc_status_type rstat;
10625 const char *sym_name;
10627 size = (bfd_size_type) bfd_get_reloc_size (howto);
10628 buf = (bfd_byte *) bfd_zmalloc (size);
10629 if (buf == NULL && size != 0)
10631 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10638 case bfd_reloc_outofrange:
10641 case bfd_reloc_overflow:
10642 if (link_order->type == bfd_section_reloc_link_order)
10643 sym_name = bfd_section_name (output_bfd,
10644 link_order->u.reloc.p->u.section);
10646 sym_name = link_order->u.reloc.p->u.name;
10647 if (! ((*info->callbacks->reloc_overflow)
10648 (info, NULL, sym_name, howto->name, addend, NULL,
10649 NULL, (bfd_vma) 0)))
10656 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10657 link_order->offset, size);
10663 /* The address of a reloc is relative to the section in a
10664 relocatable file, and is a virtual address in an executable
10666 offset = link_order->offset;
10667 if (! bfd_link_relocatable (info))
10668 offset += output_section->vma;
10670 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10672 irel[i].r_offset = offset;
10673 irel[i].r_info = 0;
10674 irel[i].r_addend = 0;
10676 if (bed->s->arch_size == 32)
10677 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10679 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10681 rel_hdr = reldata->hdr;
10682 erel = rel_hdr->contents;
10683 if (rel_hdr->sh_type == SHT_REL)
10685 erel += reldata->count * bed->s->sizeof_rel;
10686 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10690 irel[0].r_addend = addend;
10691 erel += reldata->count * bed->s->sizeof_rela;
10692 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10701 /* Get the output vma of the section pointed to by the sh_link field. */
10704 elf_get_linked_section_vma (struct bfd_link_order *p)
10706 Elf_Internal_Shdr **elf_shdrp;
10710 s = p->u.indirect.section;
10711 elf_shdrp = elf_elfsections (s->owner);
10712 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10713 elfsec = elf_shdrp[elfsec]->sh_link;
10715 The Intel C compiler generates SHT_IA_64_UNWIND with
10716 SHF_LINK_ORDER. But it doesn't set the sh_link or
10717 sh_info fields. Hence we could get the situation
10718 where elfsec is 0. */
10721 const struct elf_backend_data *bed
10722 = get_elf_backend_data (s->owner);
10723 if (bed->link_order_error_handler)
10724 bed->link_order_error_handler
10725 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10730 s = elf_shdrp[elfsec]->bfd_section;
10731 return s->output_section->vma + s->output_offset;
10736 /* Compare two sections based on the locations of the sections they are
10737 linked to. Used by elf_fixup_link_order. */
10740 compare_link_order (const void * a, const void * b)
10745 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10746 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10749 return apos > bpos;
10753 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10754 order as their linked sections. Returns false if this could not be done
10755 because an output section includes both ordered and unordered
10756 sections. Ideally we'd do this in the linker proper. */
10759 elf_fixup_link_order (bfd *abfd, asection *o)
10761 int seen_linkorder;
10764 struct bfd_link_order *p;
10766 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10768 struct bfd_link_order **sections;
10769 asection *s, *other_sec, *linkorder_sec;
10773 linkorder_sec = NULL;
10775 seen_linkorder = 0;
10776 for (p = o->map_head.link_order; p != NULL; p = p->next)
10778 if (p->type == bfd_indirect_link_order)
10780 s = p->u.indirect.section;
10782 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10783 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10784 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10785 && elfsec < elf_numsections (sub)
10786 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10787 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10801 if (seen_other && seen_linkorder)
10803 if (other_sec && linkorder_sec)
10804 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10806 linkorder_sec->owner, other_sec,
10809 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10811 bfd_set_error (bfd_error_bad_value);
10816 if (!seen_linkorder)
10819 sections = (struct bfd_link_order **)
10820 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10821 if (sections == NULL)
10823 seen_linkorder = 0;
10825 for (p = o->map_head.link_order; p != NULL; p = p->next)
10827 sections[seen_linkorder++] = p;
10829 /* Sort the input sections in the order of their linked section. */
10830 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10831 compare_link_order);
10833 /* Change the offsets of the sections. */
10835 for (n = 0; n < seen_linkorder; n++)
10837 s = sections[n]->u.indirect.section;
10838 offset &= ~(bfd_vma) 0 << s->alignment_power;
10839 s->output_offset = offset;
10840 sections[n]->offset = offset;
10841 /* FIXME: octets_per_byte. */
10842 offset += sections[n]->size;
10850 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10854 if (flinfo->symstrtab != NULL)
10855 _bfd_elf_strtab_free (flinfo->symstrtab);
10856 if (flinfo->contents != NULL)
10857 free (flinfo->contents);
10858 if (flinfo->external_relocs != NULL)
10859 free (flinfo->external_relocs);
10860 if (flinfo->internal_relocs != NULL)
10861 free (flinfo->internal_relocs);
10862 if (flinfo->external_syms != NULL)
10863 free (flinfo->external_syms);
10864 if (flinfo->locsym_shndx != NULL)
10865 free (flinfo->locsym_shndx);
10866 if (flinfo->internal_syms != NULL)
10867 free (flinfo->internal_syms);
10868 if (flinfo->indices != NULL)
10869 free (flinfo->indices);
10870 if (flinfo->sections != NULL)
10871 free (flinfo->sections);
10872 if (flinfo->symshndxbuf != NULL)
10873 free (flinfo->symshndxbuf);
10874 for (o = obfd->sections; o != NULL; o = o->next)
10876 struct bfd_elf_section_data *esdo = elf_section_data (o);
10877 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10878 free (esdo->rel.hashes);
10879 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10880 free (esdo->rela.hashes);
10884 /* Do the final step of an ELF link. */
10887 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10889 bfd_boolean dynamic;
10890 bfd_boolean emit_relocs;
10892 struct elf_final_link_info flinfo;
10894 struct bfd_link_order *p;
10896 bfd_size_type max_contents_size;
10897 bfd_size_type max_external_reloc_size;
10898 bfd_size_type max_internal_reloc_count;
10899 bfd_size_type max_sym_count;
10900 bfd_size_type max_sym_shndx_count;
10901 Elf_Internal_Sym elfsym;
10903 Elf_Internal_Shdr *symtab_hdr;
10904 Elf_Internal_Shdr *symtab_shndx_hdr;
10905 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10906 struct elf_outext_info eoinfo;
10907 bfd_boolean merged;
10908 size_t relativecount = 0;
10909 asection *reldyn = 0;
10911 asection *attr_section = NULL;
10912 bfd_vma attr_size = 0;
10913 const char *std_attrs_section;
10915 if (! is_elf_hash_table (info->hash))
10918 if (bfd_link_pic (info))
10919 abfd->flags |= DYNAMIC;
10921 dynamic = elf_hash_table (info)->dynamic_sections_created;
10922 dynobj = elf_hash_table (info)->dynobj;
10924 emit_relocs = (bfd_link_relocatable (info)
10925 || info->emitrelocations);
10927 flinfo.info = info;
10928 flinfo.output_bfd = abfd;
10929 flinfo.symstrtab = _bfd_elf_strtab_init ();
10930 if (flinfo.symstrtab == NULL)
10935 flinfo.hash_sec = NULL;
10936 flinfo.symver_sec = NULL;
10940 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
10941 /* Note that dynsym_sec can be NULL (on VMS). */
10942 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
10943 /* Note that it is OK if symver_sec is NULL. */
10946 flinfo.contents = NULL;
10947 flinfo.external_relocs = NULL;
10948 flinfo.internal_relocs = NULL;
10949 flinfo.external_syms = NULL;
10950 flinfo.locsym_shndx = NULL;
10951 flinfo.internal_syms = NULL;
10952 flinfo.indices = NULL;
10953 flinfo.sections = NULL;
10954 flinfo.symshndxbuf = NULL;
10955 flinfo.filesym_count = 0;
10957 /* The object attributes have been merged. Remove the input
10958 sections from the link, and set the contents of the output
10960 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10961 for (o = abfd->sections; o != NULL; o = o->next)
10963 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10964 || strcmp (o->name, ".gnu.attributes") == 0)
10966 for (p = o->map_head.link_order; p != NULL; p = p->next)
10968 asection *input_section;
10970 if (p->type != bfd_indirect_link_order)
10972 input_section = p->u.indirect.section;
10973 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10974 elf_link_input_bfd ignores this section. */
10975 input_section->flags &= ~SEC_HAS_CONTENTS;
10978 attr_size = bfd_elf_obj_attr_size (abfd);
10981 bfd_set_section_size (abfd, o, attr_size);
10983 /* Skip this section later on. */
10984 o->map_head.link_order = NULL;
10987 o->flags |= SEC_EXCLUDE;
10991 /* Count up the number of relocations we will output for each output
10992 section, so that we know the sizes of the reloc sections. We
10993 also figure out some maximum sizes. */
10994 max_contents_size = 0;
10995 max_external_reloc_size = 0;
10996 max_internal_reloc_count = 0;
10998 max_sym_shndx_count = 0;
11000 for (o = abfd->sections; o != NULL; o = o->next)
11002 struct bfd_elf_section_data *esdo = elf_section_data (o);
11003 o->reloc_count = 0;
11005 for (p = o->map_head.link_order; p != NULL; p = p->next)
11007 unsigned int reloc_count = 0;
11008 unsigned int additional_reloc_count = 0;
11009 struct bfd_elf_section_data *esdi = NULL;
11011 if (p->type == bfd_section_reloc_link_order
11012 || p->type == bfd_symbol_reloc_link_order)
11014 else if (p->type == bfd_indirect_link_order)
11018 sec = p->u.indirect.section;
11019 esdi = elf_section_data (sec);
11021 /* Mark all sections which are to be included in the
11022 link. This will normally be every section. We need
11023 to do this so that we can identify any sections which
11024 the linker has decided to not include. */
11025 sec->linker_mark = TRUE;
11027 if (sec->flags & SEC_MERGE)
11030 if (esdo->this_hdr.sh_type == SHT_REL
11031 || esdo->this_hdr.sh_type == SHT_RELA)
11032 /* Some backends use reloc_count in relocation sections
11033 to count particular types of relocs. Of course,
11034 reloc sections themselves can't have relocations. */
11036 else if (emit_relocs)
11038 reloc_count = sec->reloc_count;
11039 if (bed->elf_backend_count_additional_relocs)
11042 c = (*bed->elf_backend_count_additional_relocs) (sec);
11043 additional_reloc_count += c;
11046 else if (bed->elf_backend_count_relocs)
11047 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
11049 if (sec->rawsize > max_contents_size)
11050 max_contents_size = sec->rawsize;
11051 if (sec->size > max_contents_size)
11052 max_contents_size = sec->size;
11054 /* We are interested in just local symbols, not all
11056 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
11057 && (sec->owner->flags & DYNAMIC) == 0)
11061 if (elf_bad_symtab (sec->owner))
11062 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
11063 / bed->s->sizeof_sym);
11065 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
11067 if (sym_count > max_sym_count)
11068 max_sym_count = sym_count;
11070 if (sym_count > max_sym_shndx_count
11071 && elf_symtab_shndx_list (sec->owner) != NULL)
11072 max_sym_shndx_count = sym_count;
11074 if ((sec->flags & SEC_RELOC) != 0)
11076 size_t ext_size = 0;
11078 if (esdi->rel.hdr != NULL)
11079 ext_size = esdi->rel.hdr->sh_size;
11080 if (esdi->rela.hdr != NULL)
11081 ext_size += esdi->rela.hdr->sh_size;
11083 if (ext_size > max_external_reloc_size)
11084 max_external_reloc_size = ext_size;
11085 if (sec->reloc_count > max_internal_reloc_count)
11086 max_internal_reloc_count = sec->reloc_count;
11091 if (reloc_count == 0)
11094 reloc_count += additional_reloc_count;
11095 o->reloc_count += reloc_count;
11097 if (p->type == bfd_indirect_link_order && emit_relocs)
11101 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
11102 esdo->rel.count += additional_reloc_count;
11104 if (esdi->rela.hdr)
11106 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
11107 esdo->rela.count += additional_reloc_count;
11113 esdo->rela.count += reloc_count;
11115 esdo->rel.count += reloc_count;
11119 if (o->reloc_count > 0)
11120 o->flags |= SEC_RELOC;
11123 /* Explicitly clear the SEC_RELOC flag. The linker tends to
11124 set it (this is probably a bug) and if it is set
11125 assign_section_numbers will create a reloc section. */
11126 o->flags &=~ SEC_RELOC;
11129 /* If the SEC_ALLOC flag is not set, force the section VMA to
11130 zero. This is done in elf_fake_sections as well, but forcing
11131 the VMA to 0 here will ensure that relocs against these
11132 sections are handled correctly. */
11133 if ((o->flags & SEC_ALLOC) == 0
11134 && ! o->user_set_vma)
11138 if (! bfd_link_relocatable (info) && merged)
11139 elf_link_hash_traverse (elf_hash_table (info),
11140 _bfd_elf_link_sec_merge_syms, abfd);
11142 /* Figure out the file positions for everything but the symbol table
11143 and the relocs. We set symcount to force assign_section_numbers
11144 to create a symbol table. */
11145 bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
11146 BFD_ASSERT (! abfd->output_has_begun);
11147 if (! _bfd_elf_compute_section_file_positions (abfd, info))
11150 /* Set sizes, and assign file positions for reloc sections. */
11151 for (o = abfd->sections; o != NULL; o = o->next)
11153 struct bfd_elf_section_data *esdo = elf_section_data (o);
11154 if ((o->flags & SEC_RELOC) != 0)
11157 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
11161 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
11165 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
11166 to count upwards while actually outputting the relocations. */
11167 esdo->rel.count = 0;
11168 esdo->rela.count = 0;
11170 if (esdo->this_hdr.sh_offset == (file_ptr) -1)
11172 /* Cache the section contents so that they can be compressed
11173 later. Use bfd_malloc since it will be freed by
11174 bfd_compress_section_contents. */
11175 unsigned char *contents = esdo->this_hdr.contents;
11176 if ((o->flags & SEC_ELF_COMPRESS) == 0 || contents != NULL)
11179 = (unsigned char *) bfd_malloc (esdo->this_hdr.sh_size);
11180 if (contents == NULL)
11182 esdo->this_hdr.contents = contents;
11186 /* We have now assigned file positions for all the sections except
11187 .symtab, .strtab, and non-loaded reloc sections. We start the
11188 .symtab section at the current file position, and write directly
11189 to it. We build the .strtab section in memory. */
11190 bfd_get_symcount (abfd) = 0;
11191 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11192 /* sh_name is set in prep_headers. */
11193 symtab_hdr->sh_type = SHT_SYMTAB;
11194 /* sh_flags, sh_addr and sh_size all start off zero. */
11195 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
11196 /* sh_link is set in assign_section_numbers. */
11197 /* sh_info is set below. */
11198 /* sh_offset is set just below. */
11199 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
11201 if (max_sym_count < 20)
11202 max_sym_count = 20;
11203 elf_hash_table (info)->strtabsize = max_sym_count;
11204 amt = max_sym_count * sizeof (struct elf_sym_strtab);
11205 elf_hash_table (info)->strtab
11206 = (struct elf_sym_strtab *) bfd_malloc (amt);
11207 if (elf_hash_table (info)->strtab == NULL)
11209 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
11211 = (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF)
11212 ? (Elf_External_Sym_Shndx *) -1 : NULL);
11214 if (info->strip != strip_all || emit_relocs)
11216 file_ptr off = elf_next_file_pos (abfd);
11218 _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
11220 /* Note that at this point elf_next_file_pos (abfd) is
11221 incorrect. We do not yet know the size of the .symtab section.
11222 We correct next_file_pos below, after we do know the size. */
11224 /* Start writing out the symbol table. The first symbol is always a
11226 elfsym.st_value = 0;
11227 elfsym.st_size = 0;
11228 elfsym.st_info = 0;
11229 elfsym.st_other = 0;
11230 elfsym.st_shndx = SHN_UNDEF;
11231 elfsym.st_target_internal = 0;
11232 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym,
11233 bfd_und_section_ptr, NULL) != 1)
11236 /* Output a symbol for each section. We output these even if we are
11237 discarding local symbols, since they are used for relocs. These
11238 symbols have no names. We store the index of each one in the
11239 index field of the section, so that we can find it again when
11240 outputting relocs. */
11242 elfsym.st_size = 0;
11243 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11244 elfsym.st_other = 0;
11245 elfsym.st_value = 0;
11246 elfsym.st_target_internal = 0;
11247 for (i = 1; i < elf_numsections (abfd); i++)
11249 o = bfd_section_from_elf_index (abfd, i);
11252 o->target_index = bfd_get_symcount (abfd);
11253 elfsym.st_shndx = i;
11254 if (!bfd_link_relocatable (info))
11255 elfsym.st_value = o->vma;
11256 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym, o,
11263 /* Allocate some memory to hold information read in from the input
11265 if (max_contents_size != 0)
11267 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
11268 if (flinfo.contents == NULL)
11272 if (max_external_reloc_size != 0)
11274 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
11275 if (flinfo.external_relocs == NULL)
11279 if (max_internal_reloc_count != 0)
11281 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
11282 amt *= sizeof (Elf_Internal_Rela);
11283 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
11284 if (flinfo.internal_relocs == NULL)
11288 if (max_sym_count != 0)
11290 amt = max_sym_count * bed->s->sizeof_sym;
11291 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
11292 if (flinfo.external_syms == NULL)
11295 amt = max_sym_count * sizeof (Elf_Internal_Sym);
11296 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
11297 if (flinfo.internal_syms == NULL)
11300 amt = max_sym_count * sizeof (long);
11301 flinfo.indices = (long int *) bfd_malloc (amt);
11302 if (flinfo.indices == NULL)
11305 amt = max_sym_count * sizeof (asection *);
11306 flinfo.sections = (asection **) bfd_malloc (amt);
11307 if (flinfo.sections == NULL)
11311 if (max_sym_shndx_count != 0)
11313 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
11314 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
11315 if (flinfo.locsym_shndx == NULL)
11319 if (elf_hash_table (info)->tls_sec)
11321 bfd_vma base, end = 0;
11324 for (sec = elf_hash_table (info)->tls_sec;
11325 sec && (sec->flags & SEC_THREAD_LOCAL);
11328 bfd_size_type size = sec->size;
11331 && (sec->flags & SEC_HAS_CONTENTS) == 0)
11333 struct bfd_link_order *ord = sec->map_tail.link_order;
11336 size = ord->offset + ord->size;
11338 end = sec->vma + size;
11340 base = elf_hash_table (info)->tls_sec->vma;
11341 /* Only align end of TLS section if static TLS doesn't have special
11342 alignment requirements. */
11343 if (bed->static_tls_alignment == 1)
11344 end = align_power (end,
11345 elf_hash_table (info)->tls_sec->alignment_power);
11346 elf_hash_table (info)->tls_size = end - base;
11349 /* Reorder SHF_LINK_ORDER sections. */
11350 for (o = abfd->sections; o != NULL; o = o->next)
11352 if (!elf_fixup_link_order (abfd, o))
11356 if (!_bfd_elf_fixup_eh_frame_hdr (info))
11359 /* Since ELF permits relocations to be against local symbols, we
11360 must have the local symbols available when we do the relocations.
11361 Since we would rather only read the local symbols once, and we
11362 would rather not keep them in memory, we handle all the
11363 relocations for a single input file at the same time.
11365 Unfortunately, there is no way to know the total number of local
11366 symbols until we have seen all of them, and the local symbol
11367 indices precede the global symbol indices. This means that when
11368 we are generating relocatable output, and we see a reloc against
11369 a global symbol, we can not know the symbol index until we have
11370 finished examining all the local symbols to see which ones we are
11371 going to output. To deal with this, we keep the relocations in
11372 memory, and don't output them until the end of the link. This is
11373 an unfortunate waste of memory, but I don't see a good way around
11374 it. Fortunately, it only happens when performing a relocatable
11375 link, which is not the common case. FIXME: If keep_memory is set
11376 we could write the relocs out and then read them again; I don't
11377 know how bad the memory loss will be. */
11379 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11380 sub->output_has_begun = FALSE;
11381 for (o = abfd->sections; o != NULL; o = o->next)
11383 for (p = o->map_head.link_order; p != NULL; p = p->next)
11385 if (p->type == bfd_indirect_link_order
11386 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
11387 == bfd_target_elf_flavour)
11388 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
11390 if (! sub->output_has_begun)
11392 if (! elf_link_input_bfd (&flinfo, sub))
11394 sub->output_has_begun = TRUE;
11397 else if (p->type == bfd_section_reloc_link_order
11398 || p->type == bfd_symbol_reloc_link_order)
11400 if (! elf_reloc_link_order (abfd, info, o, p))
11405 if (! _bfd_default_link_order (abfd, info, o, p))
11407 if (p->type == bfd_indirect_link_order
11408 && (bfd_get_flavour (sub)
11409 == bfd_target_elf_flavour)
11410 && (elf_elfheader (sub)->e_ident[EI_CLASS]
11411 != bed->s->elfclass))
11413 const char *iclass, *oclass;
11415 switch (bed->s->elfclass)
11417 case ELFCLASS64: oclass = "ELFCLASS64"; break;
11418 case ELFCLASS32: oclass = "ELFCLASS32"; break;
11419 case ELFCLASSNONE: oclass = "ELFCLASSNONE"; break;
11423 switch (elf_elfheader (sub)->e_ident[EI_CLASS])
11425 case ELFCLASS64: iclass = "ELFCLASS64"; break;
11426 case ELFCLASS32: iclass = "ELFCLASS32"; break;
11427 case ELFCLASSNONE: iclass = "ELFCLASSNONE"; break;
11431 bfd_set_error (bfd_error_wrong_format);
11432 (*_bfd_error_handler)
11433 (_("%B: file class %s incompatible with %s"),
11434 sub, iclass, oclass);
11443 /* Free symbol buffer if needed. */
11444 if (!info->reduce_memory_overheads)
11446 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11447 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
11448 && elf_tdata (sub)->symbuf)
11450 free (elf_tdata (sub)->symbuf);
11451 elf_tdata (sub)->symbuf = NULL;
11455 /* Output any global symbols that got converted to local in a
11456 version script or due to symbol visibility. We do this in a
11457 separate step since ELF requires all local symbols to appear
11458 prior to any global symbols. FIXME: We should only do this if
11459 some global symbols were, in fact, converted to become local.
11460 FIXME: Will this work correctly with the Irix 5 linker? */
11461 eoinfo.failed = FALSE;
11462 eoinfo.flinfo = &flinfo;
11463 eoinfo.localsyms = TRUE;
11464 eoinfo.file_sym_done = FALSE;
11465 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11469 /* If backend needs to output some local symbols not present in the hash
11470 table, do it now. */
11471 if (bed->elf_backend_output_arch_local_syms
11472 && (info->strip != strip_all || emit_relocs))
11474 typedef int (*out_sym_func)
11475 (void *, const char *, Elf_Internal_Sym *, asection *,
11476 struct elf_link_hash_entry *);
11478 if (! ((*bed->elf_backend_output_arch_local_syms)
11479 (abfd, info, &flinfo,
11480 (out_sym_func) elf_link_output_symstrtab)))
11484 /* That wrote out all the local symbols. Finish up the symbol table
11485 with the global symbols. Even if we want to strip everything we
11486 can, we still need to deal with those global symbols that got
11487 converted to local in a version script. */
11489 /* The sh_info field records the index of the first non local symbol. */
11490 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11493 && elf_hash_table (info)->dynsym != NULL
11494 && (elf_hash_table (info)->dynsym->output_section
11495 != bfd_abs_section_ptr))
11497 Elf_Internal_Sym sym;
11498 bfd_byte *dynsym = elf_hash_table (info)->dynsym->contents;
11499 long last_local = 0;
11501 /* Write out the section symbols for the output sections. */
11502 if (bfd_link_pic (info)
11503 || elf_hash_table (info)->is_relocatable_executable)
11509 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11511 sym.st_target_internal = 0;
11513 for (s = abfd->sections; s != NULL; s = s->next)
11519 dynindx = elf_section_data (s)->dynindx;
11522 indx = elf_section_data (s)->this_idx;
11523 BFD_ASSERT (indx > 0);
11524 sym.st_shndx = indx;
11525 if (! check_dynsym (abfd, &sym))
11527 sym.st_value = s->vma;
11528 dest = dynsym + dynindx * bed->s->sizeof_sym;
11529 if (last_local < dynindx)
11530 last_local = dynindx;
11531 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11535 /* Write out the local dynsyms. */
11536 if (elf_hash_table (info)->dynlocal)
11538 struct elf_link_local_dynamic_entry *e;
11539 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11544 /* Copy the internal symbol and turn off visibility.
11545 Note that we saved a word of storage and overwrote
11546 the original st_name with the dynstr_index. */
11548 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11550 s = bfd_section_from_elf_index (e->input_bfd,
11555 elf_section_data (s->output_section)->this_idx;
11556 if (! check_dynsym (abfd, &sym))
11558 sym.st_value = (s->output_section->vma
11560 + e->isym.st_value);
11563 if (last_local < e->dynindx)
11564 last_local = e->dynindx;
11566 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11567 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11571 elf_section_data (elf_hash_table (info)->dynsym->output_section)->this_hdr.sh_info =
11575 /* We get the global symbols from the hash table. */
11576 eoinfo.failed = FALSE;
11577 eoinfo.localsyms = FALSE;
11578 eoinfo.flinfo = &flinfo;
11579 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11583 /* If backend needs to output some symbols not present in the hash
11584 table, do it now. */
11585 if (bed->elf_backend_output_arch_syms
11586 && (info->strip != strip_all || emit_relocs))
11588 typedef int (*out_sym_func)
11589 (void *, const char *, Elf_Internal_Sym *, asection *,
11590 struct elf_link_hash_entry *);
11592 if (! ((*bed->elf_backend_output_arch_syms)
11593 (abfd, info, &flinfo,
11594 (out_sym_func) elf_link_output_symstrtab)))
11598 /* Finalize the .strtab section. */
11599 _bfd_elf_strtab_finalize (flinfo.symstrtab);
11601 /* Swap out the .strtab section. */
11602 if (!elf_link_swap_symbols_out (&flinfo))
11605 /* Now we know the size of the symtab section. */
11606 if (bfd_get_symcount (abfd) > 0)
11608 /* Finish up and write out the symbol string table (.strtab)
11610 Elf_Internal_Shdr *symstrtab_hdr;
11611 file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
11613 symtab_shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr;
11614 if (symtab_shndx_hdr != NULL && symtab_shndx_hdr->sh_name != 0)
11616 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11617 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11618 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11619 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11620 symtab_shndx_hdr->sh_size = amt;
11622 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11625 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11626 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11630 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11631 /* sh_name was set in prep_headers. */
11632 symstrtab_hdr->sh_type = SHT_STRTAB;
11633 symstrtab_hdr->sh_flags = 0;
11634 symstrtab_hdr->sh_addr = 0;
11635 symstrtab_hdr->sh_size = _bfd_elf_strtab_size (flinfo.symstrtab);
11636 symstrtab_hdr->sh_entsize = 0;
11637 symstrtab_hdr->sh_link = 0;
11638 symstrtab_hdr->sh_info = 0;
11639 /* sh_offset is set just below. */
11640 symstrtab_hdr->sh_addralign = 1;
11642 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
11644 elf_next_file_pos (abfd) = off;
11646 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11647 || ! _bfd_elf_strtab_emit (abfd, flinfo.symstrtab))
11651 /* Adjust the relocs to have the correct symbol indices. */
11652 for (o = abfd->sections; o != NULL; o = o->next)
11654 struct bfd_elf_section_data *esdo = elf_section_data (o);
11656 if ((o->flags & SEC_RELOC) == 0)
11659 sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o);
11660 if (esdo->rel.hdr != NULL
11661 && !elf_link_adjust_relocs (abfd, &esdo->rel, sort))
11663 if (esdo->rela.hdr != NULL
11664 && !elf_link_adjust_relocs (abfd, &esdo->rela, sort))
11667 /* Set the reloc_count field to 0 to prevent write_relocs from
11668 trying to swap the relocs out itself. */
11669 o->reloc_count = 0;
11672 if (dynamic && info->combreloc && dynobj != NULL)
11673 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11675 /* If we are linking against a dynamic object, or generating a
11676 shared library, finish up the dynamic linking information. */
11679 bfd_byte *dyncon, *dynconend;
11681 /* Fix up .dynamic entries. */
11682 o = bfd_get_linker_section (dynobj, ".dynamic");
11683 BFD_ASSERT (o != NULL);
11685 dyncon = o->contents;
11686 dynconend = o->contents + o->size;
11687 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11689 Elf_Internal_Dyn dyn;
11693 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11700 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11702 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11704 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11705 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11708 dyn.d_un.d_val = relativecount;
11715 name = info->init_function;
11718 name = info->fini_function;
11721 struct elf_link_hash_entry *h;
11723 h = elf_link_hash_lookup (elf_hash_table (info), name,
11724 FALSE, FALSE, TRUE);
11726 && (h->root.type == bfd_link_hash_defined
11727 || h->root.type == bfd_link_hash_defweak))
11729 dyn.d_un.d_ptr = h->root.u.def.value;
11730 o = h->root.u.def.section;
11731 if (o->output_section != NULL)
11732 dyn.d_un.d_ptr += (o->output_section->vma
11733 + o->output_offset);
11736 /* The symbol is imported from another shared
11737 library and does not apply to this one. */
11738 dyn.d_un.d_ptr = 0;
11745 case DT_PREINIT_ARRAYSZ:
11746 name = ".preinit_array";
11748 case DT_INIT_ARRAYSZ:
11749 name = ".init_array";
11751 case DT_FINI_ARRAYSZ:
11752 name = ".fini_array";
11754 o = bfd_get_section_by_name (abfd, name);
11757 (*_bfd_error_handler)
11758 (_("%B: could not find output section %s"), abfd, name);
11762 (*_bfd_error_handler)
11763 (_("warning: %s section has zero size"), name);
11764 dyn.d_un.d_val = o->size;
11767 case DT_PREINIT_ARRAY:
11768 name = ".preinit_array";
11770 case DT_INIT_ARRAY:
11771 name = ".init_array";
11773 case DT_FINI_ARRAY:
11774 name = ".fini_array";
11781 name = ".gnu.hash";
11790 name = ".gnu.version_d";
11793 name = ".gnu.version_r";
11796 name = ".gnu.version";
11798 o = bfd_get_section_by_name (abfd, name);
11801 (*_bfd_error_handler)
11802 (_("%B: could not find output section %s"), abfd, name);
11805 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11807 (*_bfd_error_handler)
11808 (_("warning: section '%s' is being made into a note"), name);
11809 bfd_set_error (bfd_error_nonrepresentable_section);
11812 dyn.d_un.d_ptr = o->vma;
11819 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11823 dyn.d_un.d_val = 0;
11824 dyn.d_un.d_ptr = 0;
11825 for (i = 1; i < elf_numsections (abfd); i++)
11827 Elf_Internal_Shdr *hdr;
11829 hdr = elf_elfsections (abfd)[i];
11830 if (hdr->sh_type == type
11831 && (hdr->sh_flags & SHF_ALLOC) != 0)
11833 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11834 dyn.d_un.d_val += hdr->sh_size;
11837 if (dyn.d_un.d_ptr == 0
11838 || hdr->sh_addr < dyn.d_un.d_ptr)
11839 dyn.d_un.d_ptr = hdr->sh_addr;
11845 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11849 /* If we have created any dynamic sections, then output them. */
11850 if (dynobj != NULL)
11852 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11855 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11856 if (((info->warn_shared_textrel && bfd_link_pic (info))
11857 || info->error_textrel)
11858 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11860 bfd_byte *dyncon, *dynconend;
11862 dyncon = o->contents;
11863 dynconend = o->contents + o->size;
11864 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11866 Elf_Internal_Dyn dyn;
11868 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11870 if (dyn.d_tag == DT_TEXTREL)
11872 if (info->error_textrel)
11873 info->callbacks->einfo
11874 (_("%P%X: read-only segment has dynamic relocations.\n"));
11876 info->callbacks->einfo
11877 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11883 for (o = dynobj->sections; o != NULL; o = o->next)
11885 if ((o->flags & SEC_HAS_CONTENTS) == 0
11887 || o->output_section == bfd_abs_section_ptr)
11889 if ((o->flags & SEC_LINKER_CREATED) == 0)
11891 /* At this point, we are only interested in sections
11892 created by _bfd_elf_link_create_dynamic_sections. */
11895 if (elf_hash_table (info)->stab_info.stabstr == o)
11897 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11899 if (strcmp (o->name, ".dynstr") != 0)
11901 /* FIXME: octets_per_byte. */
11902 if (! bfd_set_section_contents (abfd, o->output_section,
11904 (file_ptr) o->output_offset,
11910 /* The contents of the .dynstr section are actually in a
11914 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11915 if (bfd_seek (abfd, off, SEEK_SET) != 0
11916 || ! _bfd_elf_strtab_emit (abfd,
11917 elf_hash_table (info)->dynstr))
11923 if (bfd_link_relocatable (info))
11925 bfd_boolean failed = FALSE;
11927 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11932 /* If we have optimized stabs strings, output them. */
11933 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11935 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11939 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11942 elf_final_link_free (abfd, &flinfo);
11944 elf_linker (abfd) = TRUE;
11948 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11949 if (contents == NULL)
11950 return FALSE; /* Bail out and fail. */
11951 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11952 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11959 elf_final_link_free (abfd, &flinfo);
11963 /* Initialize COOKIE for input bfd ABFD. */
11966 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11967 struct bfd_link_info *info, bfd *abfd)
11969 Elf_Internal_Shdr *symtab_hdr;
11970 const struct elf_backend_data *bed;
11972 bed = get_elf_backend_data (abfd);
11973 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11975 cookie->abfd = abfd;
11976 cookie->sym_hashes = elf_sym_hashes (abfd);
11977 cookie->bad_symtab = elf_bad_symtab (abfd);
11978 if (cookie->bad_symtab)
11980 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11981 cookie->extsymoff = 0;
11985 cookie->locsymcount = symtab_hdr->sh_info;
11986 cookie->extsymoff = symtab_hdr->sh_info;
11989 if (bed->s->arch_size == 32)
11990 cookie->r_sym_shift = 8;
11992 cookie->r_sym_shift = 32;
11994 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11995 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11997 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11998 cookie->locsymcount, 0,
12000 if (cookie->locsyms == NULL)
12002 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
12005 if (info->keep_memory)
12006 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
12011 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
12014 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
12016 Elf_Internal_Shdr *symtab_hdr;
12018 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12019 if (cookie->locsyms != NULL
12020 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
12021 free (cookie->locsyms);
12024 /* Initialize the relocation information in COOKIE for input section SEC
12025 of input bfd ABFD. */
12028 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12029 struct bfd_link_info *info, bfd *abfd,
12032 const struct elf_backend_data *bed;
12034 if (sec->reloc_count == 0)
12036 cookie->rels = NULL;
12037 cookie->relend = NULL;
12041 bed = get_elf_backend_data (abfd);
12043 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
12044 info->keep_memory);
12045 if (cookie->rels == NULL)
12047 cookie->rel = cookie->rels;
12048 cookie->relend = (cookie->rels
12049 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
12051 cookie->rel = cookie->rels;
12055 /* Free the memory allocated by init_reloc_cookie_rels,
12059 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12062 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
12063 free (cookie->rels);
12066 /* Initialize the whole of COOKIE for input section SEC. */
12069 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12070 struct bfd_link_info *info,
12073 if (!init_reloc_cookie (cookie, info, sec->owner))
12075 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
12080 fini_reloc_cookie (cookie, sec->owner);
12085 /* Free the memory allocated by init_reloc_cookie_for_section,
12089 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12092 fini_reloc_cookie_rels (cookie, sec);
12093 fini_reloc_cookie (cookie, sec->owner);
12096 /* Garbage collect unused sections. */
12098 /* Default gc_mark_hook. */
12101 _bfd_elf_gc_mark_hook (asection *sec,
12102 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12103 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
12104 struct elf_link_hash_entry *h,
12105 Elf_Internal_Sym *sym)
12109 switch (h->root.type)
12111 case bfd_link_hash_defined:
12112 case bfd_link_hash_defweak:
12113 return h->root.u.def.section;
12115 case bfd_link_hash_common:
12116 return h->root.u.c.p->section;
12123 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
12128 /* COOKIE->rel describes a relocation against section SEC, which is
12129 a section we've decided to keep. Return the section that contains
12130 the relocation symbol, or NULL if no section contains it. */
12133 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
12134 elf_gc_mark_hook_fn gc_mark_hook,
12135 struct elf_reloc_cookie *cookie,
12136 bfd_boolean *start_stop)
12138 unsigned long r_symndx;
12139 struct elf_link_hash_entry *h;
12141 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
12142 if (r_symndx == STN_UNDEF)
12145 if (r_symndx >= cookie->locsymcount
12146 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12148 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
12151 info->callbacks->einfo (_("%F%P: corrupt input: %B\n"),
12155 while (h->root.type == bfd_link_hash_indirect
12156 || h->root.type == bfd_link_hash_warning)
12157 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12159 /* If this symbol is weak and there is a non-weak definition, we
12160 keep the non-weak definition because many backends put
12161 dynamic reloc info on the non-weak definition for code
12162 handling copy relocs. */
12163 if (h->u.weakdef != NULL)
12164 h->u.weakdef->mark = 1;
12166 if (start_stop != NULL
12167 && (h->root.type == bfd_link_hash_undefined
12168 || h->root.type == bfd_link_hash_undefweak))
12170 /* To work around a glibc bug, mark all XXX input sections
12171 when there is an as yet undefined reference to __start_XXX
12172 or __stop_XXX symbols. The linker will later define such
12173 symbols for orphan input sections that have a name
12174 representable as a C identifier. */
12175 const char *sec_name = NULL;
12176 if (strncmp (h->root.root.string, "__start_", 8) == 0)
12177 sec_name = h->root.root.string + 8;
12178 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
12179 sec_name = h->root.root.string + 7;
12181 if (sec_name != NULL && *sec_name != '\0')
12185 for (i = info->input_bfds; i != NULL; i = i->link.next)
12187 asection *s = bfd_get_section_by_name (i, sec_name);
12188 if (s != NULL && !s->gc_mark)
12190 *start_stop = TRUE;
12197 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
12200 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
12201 &cookie->locsyms[r_symndx]);
12204 /* COOKIE->rel describes a relocation against section SEC, which is
12205 a section we've decided to keep. Mark the section that contains
12206 the relocation symbol. */
12209 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
12211 elf_gc_mark_hook_fn gc_mark_hook,
12212 struct elf_reloc_cookie *cookie)
12215 bfd_boolean start_stop = FALSE;
12217 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie, &start_stop);
12218 while (rsec != NULL)
12220 if (!rsec->gc_mark)
12222 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
12223 || (rsec->owner->flags & DYNAMIC) != 0)
12225 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
12230 rsec = bfd_get_next_section_by_name (rsec->owner, rsec);
12235 /* The mark phase of garbage collection. For a given section, mark
12236 it and any sections in this section's group, and all the sections
12237 which define symbols to which it refers. */
12240 _bfd_elf_gc_mark (struct bfd_link_info *info,
12242 elf_gc_mark_hook_fn gc_mark_hook)
12245 asection *group_sec, *eh_frame;
12249 /* Mark all the sections in the group. */
12250 group_sec = elf_section_data (sec)->next_in_group;
12251 if (group_sec && !group_sec->gc_mark)
12252 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
12255 /* Look through the section relocs. */
12257 eh_frame = elf_eh_frame_section (sec->owner);
12258 if ((sec->flags & SEC_RELOC) != 0
12259 && sec->reloc_count > 0
12260 && sec != eh_frame)
12262 struct elf_reloc_cookie cookie;
12264 if (!init_reloc_cookie_for_section (&cookie, info, sec))
12268 for (; cookie.rel < cookie.relend; cookie.rel++)
12269 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
12274 fini_reloc_cookie_for_section (&cookie, sec);
12278 if (ret && eh_frame && elf_fde_list (sec))
12280 struct elf_reloc_cookie cookie;
12282 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
12286 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
12287 gc_mark_hook, &cookie))
12289 fini_reloc_cookie_for_section (&cookie, eh_frame);
12293 eh_frame = elf_section_eh_frame_entry (sec);
12294 if (ret && eh_frame && !eh_frame->gc_mark)
12295 if (!_bfd_elf_gc_mark (info, eh_frame, gc_mark_hook))
12301 /* Scan and mark sections in a special or debug section group. */
12304 _bfd_elf_gc_mark_debug_special_section_group (asection *grp)
12306 /* Point to first section of section group. */
12308 /* Used to iterate the section group. */
12311 bfd_boolean is_special_grp = TRUE;
12312 bfd_boolean is_debug_grp = TRUE;
12314 /* First scan to see if group contains any section other than debug
12315 and special section. */
12316 ssec = msec = elf_next_in_group (grp);
12319 if ((msec->flags & SEC_DEBUGGING) == 0)
12320 is_debug_grp = FALSE;
12322 if ((msec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) != 0)
12323 is_special_grp = FALSE;
12325 msec = elf_next_in_group (msec);
12327 while (msec != ssec);
12329 /* If this is a pure debug section group or pure special section group,
12330 keep all sections in this group. */
12331 if (is_debug_grp || is_special_grp)
12336 msec = elf_next_in_group (msec);
12338 while (msec != ssec);
12342 /* Keep debug and special sections. */
12345 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
12346 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
12350 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12353 bfd_boolean some_kept;
12354 bfd_boolean debug_frag_seen;
12356 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12359 /* Ensure all linker created sections are kept,
12360 see if any other section is already marked,
12361 and note if we have any fragmented debug sections. */
12362 debug_frag_seen = some_kept = FALSE;
12363 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12365 if ((isec->flags & SEC_LINKER_CREATED) != 0)
12367 else if (isec->gc_mark)
12370 if (debug_frag_seen == FALSE
12371 && (isec->flags & SEC_DEBUGGING)
12372 && CONST_STRNEQ (isec->name, ".debug_line."))
12373 debug_frag_seen = TRUE;
12376 /* If no section in this file will be kept, then we can
12377 toss out the debug and special sections. */
12381 /* Keep debug and special sections like .comment when they are
12382 not part of a group. Also keep section groups that contain
12383 just debug sections or special sections. */
12384 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12386 if ((isec->flags & SEC_GROUP) != 0)
12387 _bfd_elf_gc_mark_debug_special_section_group (isec);
12388 else if (((isec->flags & SEC_DEBUGGING) != 0
12389 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
12390 && elf_next_in_group (isec) == NULL)
12394 if (! debug_frag_seen)
12397 /* Look for CODE sections which are going to be discarded,
12398 and find and discard any fragmented debug sections which
12399 are associated with that code section. */
12400 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12401 if ((isec->flags & SEC_CODE) != 0
12402 && isec->gc_mark == 0)
12407 ilen = strlen (isec->name);
12409 /* Association is determined by the name of the debug section
12410 containing the name of the code section as a suffix. For
12411 example .debug_line.text.foo is a debug section associated
12413 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
12417 if (dsec->gc_mark == 0
12418 || (dsec->flags & SEC_DEBUGGING) == 0)
12421 dlen = strlen (dsec->name);
12424 && strncmp (dsec->name + (dlen - ilen),
12425 isec->name, ilen) == 0)
12435 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
12437 struct elf_gc_sweep_symbol_info
12439 struct bfd_link_info *info;
12440 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
12445 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
12448 && (((h->root.type == bfd_link_hash_defined
12449 || h->root.type == bfd_link_hash_defweak)
12450 && !((h->def_regular || ELF_COMMON_DEF_P (h))
12451 && h->root.u.def.section->gc_mark))
12452 || h->root.type == bfd_link_hash_undefined
12453 || h->root.type == bfd_link_hash_undefweak))
12455 struct elf_gc_sweep_symbol_info *inf;
12457 inf = (struct elf_gc_sweep_symbol_info *) data;
12458 (*inf->hide_symbol) (inf->info, h, TRUE);
12459 h->def_regular = 0;
12460 h->ref_regular = 0;
12461 h->ref_regular_nonweak = 0;
12467 /* The sweep phase of garbage collection. Remove all garbage sections. */
12469 typedef bfd_boolean (*gc_sweep_hook_fn)
12470 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
12473 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
12476 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12477 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
12478 unsigned long section_sym_count;
12479 struct elf_gc_sweep_symbol_info sweep_info;
12481 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12485 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12486 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12489 for (o = sub->sections; o != NULL; o = o->next)
12491 /* When any section in a section group is kept, we keep all
12492 sections in the section group. If the first member of
12493 the section group is excluded, we will also exclude the
12495 if (o->flags & SEC_GROUP)
12497 asection *first = elf_next_in_group (o);
12498 o->gc_mark = first->gc_mark;
12504 /* Skip sweeping sections already excluded. */
12505 if (o->flags & SEC_EXCLUDE)
12508 /* Since this is early in the link process, it is simple
12509 to remove a section from the output. */
12510 o->flags |= SEC_EXCLUDE;
12512 if (info->print_gc_sections && o->size != 0)
12513 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
12515 /* But we also have to update some of the relocation
12516 info we collected before. */
12518 && (o->flags & SEC_RELOC) != 0
12519 && o->reloc_count != 0
12520 && !((info->strip == strip_all || info->strip == strip_debugger)
12521 && (o->flags & SEC_DEBUGGING) != 0)
12522 && !bfd_is_abs_section (o->output_section))
12524 Elf_Internal_Rela *internal_relocs;
12528 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
12529 info->keep_memory);
12530 if (internal_relocs == NULL)
12533 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
12535 if (elf_section_data (o)->relocs != internal_relocs)
12536 free (internal_relocs);
12544 /* Remove the symbols that were in the swept sections from the dynamic
12545 symbol table. GCFIXME: Anyone know how to get them out of the
12546 static symbol table as well? */
12547 sweep_info.info = info;
12548 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
12549 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
12552 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
12556 /* Propagate collected vtable information. This is called through
12557 elf_link_hash_traverse. */
12560 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
12562 /* Those that are not vtables. */
12563 if (h->vtable == NULL || h->vtable->parent == NULL)
12566 /* Those vtables that do not have parents, we cannot merge. */
12567 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12570 /* If we've already been done, exit. */
12571 if (h->vtable->used && h->vtable->used[-1])
12574 /* Make sure the parent's table is up to date. */
12575 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12577 if (h->vtable->used == NULL)
12579 /* None of this table's entries were referenced. Re-use the
12581 h->vtable->used = h->vtable->parent->vtable->used;
12582 h->vtable->size = h->vtable->parent->vtable->size;
12587 bfd_boolean *cu, *pu;
12589 /* Or the parent's entries into ours. */
12590 cu = h->vtable->used;
12592 pu = h->vtable->parent->vtable->used;
12595 const struct elf_backend_data *bed;
12596 unsigned int log_file_align;
12598 bed = get_elf_backend_data (h->root.u.def.section->owner);
12599 log_file_align = bed->s->log_file_align;
12600 n = h->vtable->parent->vtable->size >> log_file_align;
12615 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12618 bfd_vma hstart, hend;
12619 Elf_Internal_Rela *relstart, *relend, *rel;
12620 const struct elf_backend_data *bed;
12621 unsigned int log_file_align;
12623 /* Take care of both those symbols that do not describe vtables as
12624 well as those that are not loaded. */
12625 if (h->vtable == NULL || h->vtable->parent == NULL)
12628 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12629 || h->root.type == bfd_link_hash_defweak);
12631 sec = h->root.u.def.section;
12632 hstart = h->root.u.def.value;
12633 hend = hstart + h->size;
12635 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12637 return *(bfd_boolean *) okp = FALSE;
12638 bed = get_elf_backend_data (sec->owner);
12639 log_file_align = bed->s->log_file_align;
12641 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12643 for (rel = relstart; rel < relend; ++rel)
12644 if (rel->r_offset >= hstart && rel->r_offset < hend)
12646 /* If the entry is in use, do nothing. */
12647 if (h->vtable->used
12648 && (rel->r_offset - hstart) < h->vtable->size)
12650 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12651 if (h->vtable->used[entry])
12654 /* Otherwise, kill it. */
12655 rel->r_offset = rel->r_info = rel->r_addend = 0;
12661 /* Mark sections containing dynamically referenced symbols. When
12662 building shared libraries, we must assume that any visible symbol is
12666 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12668 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12669 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12671 if ((h->root.type == bfd_link_hash_defined
12672 || h->root.type == bfd_link_hash_defweak)
12674 || ((h->def_regular || ELF_COMMON_DEF_P (h))
12675 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12676 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12677 && (!bfd_link_executable (info)
12678 || info->export_dynamic
12681 && (*d->match) (&d->head, NULL, h->root.root.string)))
12682 && (h->versioned >= versioned
12683 || !bfd_hide_sym_by_version (info->version_info,
12684 h->root.root.string)))))
12685 h->root.u.def.section->flags |= SEC_KEEP;
12690 /* Keep all sections containing symbols undefined on the command-line,
12691 and the section containing the entry symbol. */
12694 _bfd_elf_gc_keep (struct bfd_link_info *info)
12696 struct bfd_sym_chain *sym;
12698 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12700 struct elf_link_hash_entry *h;
12702 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12703 FALSE, FALSE, FALSE);
12706 && (h->root.type == bfd_link_hash_defined
12707 || h->root.type == bfd_link_hash_defweak)
12708 && !bfd_is_abs_section (h->root.u.def.section))
12709 h->root.u.def.section->flags |= SEC_KEEP;
12714 bfd_elf_parse_eh_frame_entries (bfd *abfd ATTRIBUTE_UNUSED,
12715 struct bfd_link_info *info)
12717 bfd *ibfd = info->input_bfds;
12719 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12722 struct elf_reloc_cookie cookie;
12724 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12727 if (!init_reloc_cookie (&cookie, info, ibfd))
12730 for (sec = ibfd->sections; sec; sec = sec->next)
12732 if (CONST_STRNEQ (bfd_section_name (ibfd, sec), ".eh_frame_entry")
12733 && init_reloc_cookie_rels (&cookie, info, ibfd, sec))
12735 _bfd_elf_parse_eh_frame_entry (info, sec, &cookie);
12736 fini_reloc_cookie_rels (&cookie, sec);
12743 /* Do mark and sweep of unused sections. */
12746 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12748 bfd_boolean ok = TRUE;
12750 elf_gc_mark_hook_fn gc_mark_hook;
12751 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12752 struct elf_link_hash_table *htab;
12754 if (!bed->can_gc_sections
12755 || !is_elf_hash_table (info->hash))
12757 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12761 bed->gc_keep (info);
12762 htab = elf_hash_table (info);
12764 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12765 at the .eh_frame section if we can mark the FDEs individually. */
12766 for (sub = info->input_bfds;
12767 info->eh_frame_hdr_type != COMPACT_EH_HDR && sub != NULL;
12768 sub = sub->link.next)
12771 struct elf_reloc_cookie cookie;
12773 sec = bfd_get_section_by_name (sub, ".eh_frame");
12774 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12776 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12777 if (elf_section_data (sec)->sec_info
12778 && (sec->flags & SEC_LINKER_CREATED) == 0)
12779 elf_eh_frame_section (sub) = sec;
12780 fini_reloc_cookie_for_section (&cookie, sec);
12781 sec = bfd_get_next_section_by_name (NULL, sec);
12785 /* Apply transitive closure to the vtable entry usage info. */
12786 elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
12790 /* Kill the vtable relocations that were not used. */
12791 elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
12795 /* Mark dynamically referenced symbols. */
12796 if (htab->dynamic_sections_created)
12797 elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
12799 /* Grovel through relocs to find out who stays ... */
12800 gc_mark_hook = bed->gc_mark_hook;
12801 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12805 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12806 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12809 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12810 Also treat note sections as a root, if the section is not part
12812 for (o = sub->sections; o != NULL; o = o->next)
12814 && (o->flags & SEC_EXCLUDE) == 0
12815 && ((o->flags & SEC_KEEP) != 0
12816 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12817 && elf_next_in_group (o) == NULL )))
12819 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12824 /* Allow the backend to mark additional target specific sections. */
12825 bed->gc_mark_extra_sections (info, gc_mark_hook);
12827 /* ... and mark SEC_EXCLUDE for those that go. */
12828 return elf_gc_sweep (abfd, info);
12831 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12834 bfd_elf_gc_record_vtinherit (bfd *abfd,
12836 struct elf_link_hash_entry *h,
12839 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12840 struct elf_link_hash_entry **search, *child;
12841 bfd_size_type extsymcount;
12842 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12844 /* The sh_info field of the symtab header tells us where the
12845 external symbols start. We don't care about the local symbols at
12847 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12848 if (!elf_bad_symtab (abfd))
12849 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12851 sym_hashes = elf_sym_hashes (abfd);
12852 sym_hashes_end = sym_hashes + extsymcount;
12854 /* Hunt down the child symbol, which is in this section at the same
12855 offset as the relocation. */
12856 for (search = sym_hashes; search != sym_hashes_end; ++search)
12858 if ((child = *search) != NULL
12859 && (child->root.type == bfd_link_hash_defined
12860 || child->root.type == bfd_link_hash_defweak)
12861 && child->root.u.def.section == sec
12862 && child->root.u.def.value == offset)
12866 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12867 abfd, sec, (unsigned long) offset);
12868 bfd_set_error (bfd_error_invalid_operation);
12872 if (!child->vtable)
12874 child->vtable = ((struct elf_link_virtual_table_entry *)
12875 bfd_zalloc (abfd, sizeof (*child->vtable)));
12876 if (!child->vtable)
12881 /* This *should* only be the absolute section. It could potentially
12882 be that someone has defined a non-global vtable though, which
12883 would be bad. It isn't worth paging in the local symbols to be
12884 sure though; that case should simply be handled by the assembler. */
12886 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12889 child->vtable->parent = h;
12894 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12897 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12898 asection *sec ATTRIBUTE_UNUSED,
12899 struct elf_link_hash_entry *h,
12902 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12903 unsigned int log_file_align = bed->s->log_file_align;
12907 h->vtable = ((struct elf_link_virtual_table_entry *)
12908 bfd_zalloc (abfd, sizeof (*h->vtable)));
12913 if (addend >= h->vtable->size)
12915 size_t size, bytes, file_align;
12916 bfd_boolean *ptr = h->vtable->used;
12918 /* While the symbol is undefined, we have to be prepared to handle
12920 file_align = 1 << log_file_align;
12921 if (h->root.type == bfd_link_hash_undefined)
12922 size = addend + file_align;
12926 if (addend >= size)
12928 /* Oops! We've got a reference past the defined end of
12929 the table. This is probably a bug -- shall we warn? */
12930 size = addend + file_align;
12933 size = (size + file_align - 1) & -file_align;
12935 /* Allocate one extra entry for use as a "done" flag for the
12936 consolidation pass. */
12937 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12941 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12947 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12948 * sizeof (bfd_boolean));
12949 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12953 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12958 /* And arrange for that done flag to be at index -1. */
12959 h->vtable->used = ptr + 1;
12960 h->vtable->size = size;
12963 h->vtable->used[addend >> log_file_align] = TRUE;
12968 /* Map an ELF section header flag to its corresponding string. */
12972 flagword flag_value;
12973 } elf_flags_to_name_table;
12975 static elf_flags_to_name_table elf_flags_to_names [] =
12977 { "SHF_WRITE", SHF_WRITE },
12978 { "SHF_ALLOC", SHF_ALLOC },
12979 { "SHF_EXECINSTR", SHF_EXECINSTR },
12980 { "SHF_MERGE", SHF_MERGE },
12981 { "SHF_STRINGS", SHF_STRINGS },
12982 { "SHF_INFO_LINK", SHF_INFO_LINK},
12983 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
12984 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
12985 { "SHF_GROUP", SHF_GROUP },
12986 { "SHF_TLS", SHF_TLS },
12987 { "SHF_MASKOS", SHF_MASKOS },
12988 { "SHF_EXCLUDE", SHF_EXCLUDE },
12991 /* Returns TRUE if the section is to be included, otherwise FALSE. */
12993 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
12994 struct flag_info *flaginfo,
12997 const bfd_vma sh_flags = elf_section_flags (section);
12999 if (!flaginfo->flags_initialized)
13001 bfd *obfd = info->output_bfd;
13002 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13003 struct flag_info_list *tf = flaginfo->flag_list;
13005 int without_hex = 0;
13007 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
13010 flagword (*lookup) (char *);
13012 lookup = bed->elf_backend_lookup_section_flags_hook;
13013 if (lookup != NULL)
13015 flagword hexval = (*lookup) ((char *) tf->name);
13019 if (tf->with == with_flags)
13020 with_hex |= hexval;
13021 else if (tf->with == without_flags)
13022 without_hex |= hexval;
13027 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
13029 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
13031 if (tf->with == with_flags)
13032 with_hex |= elf_flags_to_names[i].flag_value;
13033 else if (tf->with == without_flags)
13034 without_hex |= elf_flags_to_names[i].flag_value;
13041 info->callbacks->einfo
13042 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
13046 flaginfo->flags_initialized = TRUE;
13047 flaginfo->only_with_flags |= with_hex;
13048 flaginfo->not_with_flags |= without_hex;
13051 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
13054 if ((flaginfo->not_with_flags & sh_flags) != 0)
13060 struct alloc_got_off_arg {
13062 struct bfd_link_info *info;
13065 /* We need a special top-level link routine to convert got reference counts
13066 to real got offsets. */
13069 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
13071 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
13072 bfd *obfd = gofarg->info->output_bfd;
13073 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13075 if (h->got.refcount > 0)
13077 h->got.offset = gofarg->gotoff;
13078 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
13081 h->got.offset = (bfd_vma) -1;
13086 /* And an accompanying bit to work out final got entry offsets once
13087 we're done. Should be called from final_link. */
13090 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
13091 struct bfd_link_info *info)
13094 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13096 struct alloc_got_off_arg gofarg;
13098 BFD_ASSERT (abfd == info->output_bfd);
13100 if (! is_elf_hash_table (info->hash))
13103 /* The GOT offset is relative to the .got section, but the GOT header is
13104 put into the .got.plt section, if the backend uses it. */
13105 if (bed->want_got_plt)
13108 gotoff = bed->got_header_size;
13110 /* Do the local .got entries first. */
13111 for (i = info->input_bfds; i; i = i->link.next)
13113 bfd_signed_vma *local_got;
13114 bfd_size_type j, locsymcount;
13115 Elf_Internal_Shdr *symtab_hdr;
13117 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
13120 local_got = elf_local_got_refcounts (i);
13124 symtab_hdr = &elf_tdata (i)->symtab_hdr;
13125 if (elf_bad_symtab (i))
13126 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
13128 locsymcount = symtab_hdr->sh_info;
13130 for (j = 0; j < locsymcount; ++j)
13132 if (local_got[j] > 0)
13134 local_got[j] = gotoff;
13135 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
13138 local_got[j] = (bfd_vma) -1;
13142 /* Then the global .got entries. .plt refcounts are handled by
13143 adjust_dynamic_symbol */
13144 gofarg.gotoff = gotoff;
13145 gofarg.info = info;
13146 elf_link_hash_traverse (elf_hash_table (info),
13147 elf_gc_allocate_got_offsets,
13152 /* Many folk need no more in the way of final link than this, once
13153 got entry reference counting is enabled. */
13156 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
13158 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
13161 /* Invoke the regular ELF backend linker to do all the work. */
13162 return bfd_elf_final_link (abfd, info);
13166 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
13168 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
13170 if (rcookie->bad_symtab)
13171 rcookie->rel = rcookie->rels;
13173 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
13175 unsigned long r_symndx;
13177 if (! rcookie->bad_symtab)
13178 if (rcookie->rel->r_offset > offset)
13180 if (rcookie->rel->r_offset != offset)
13183 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
13184 if (r_symndx == STN_UNDEF)
13187 if (r_symndx >= rcookie->locsymcount
13188 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
13190 struct elf_link_hash_entry *h;
13192 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
13194 while (h->root.type == bfd_link_hash_indirect
13195 || h->root.type == bfd_link_hash_warning)
13196 h = (struct elf_link_hash_entry *) h->root.u.i.link;
13198 if ((h->root.type == bfd_link_hash_defined
13199 || h->root.type == bfd_link_hash_defweak)
13200 && (h->root.u.def.section->owner != rcookie->abfd
13201 || h->root.u.def.section->kept_section != NULL
13202 || discarded_section (h->root.u.def.section)))
13207 /* It's not a relocation against a global symbol,
13208 but it could be a relocation against a local
13209 symbol for a discarded section. */
13211 Elf_Internal_Sym *isym;
13213 /* Need to: get the symbol; get the section. */
13214 isym = &rcookie->locsyms[r_symndx];
13215 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
13217 && (isec->kept_section != NULL
13218 || discarded_section (isec)))
13226 /* Discard unneeded references to discarded sections.
13227 Returns -1 on error, 1 if any section's size was changed, 0 if
13228 nothing changed. This function assumes that the relocations are in
13229 sorted order, which is true for all known assemblers. */
13232 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
13234 struct elf_reloc_cookie cookie;
13239 if (info->traditional_format
13240 || !is_elf_hash_table (info->hash))
13243 o = bfd_get_section_by_name (output_bfd, ".stab");
13248 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
13251 || i->reloc_count == 0
13252 || i->sec_info_type != SEC_INFO_TYPE_STABS)
13256 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13259 if (!init_reloc_cookie_for_section (&cookie, info, i))
13262 if (_bfd_discard_section_stabs (abfd, i,
13263 elf_section_data (i)->sec_info,
13264 bfd_elf_reloc_symbol_deleted_p,
13268 fini_reloc_cookie_for_section (&cookie, i);
13273 if (info->eh_frame_hdr_type != COMPACT_EH_HDR)
13274 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
13279 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
13285 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13288 if (!init_reloc_cookie_for_section (&cookie, info, i))
13291 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
13292 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
13293 bfd_elf_reloc_symbol_deleted_p,
13297 fini_reloc_cookie_for_section (&cookie, i);
13301 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
13303 const struct elf_backend_data *bed;
13305 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13308 bed = get_elf_backend_data (abfd);
13310 if (bed->elf_backend_discard_info != NULL)
13312 if (!init_reloc_cookie (&cookie, info, abfd))
13315 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
13318 fini_reloc_cookie (&cookie, abfd);
13322 if (info->eh_frame_hdr_type == COMPACT_EH_HDR)
13323 _bfd_elf_end_eh_frame_parsing (info);
13325 if (info->eh_frame_hdr_type
13326 && !bfd_link_relocatable (info)
13327 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
13334 _bfd_elf_section_already_linked (bfd *abfd,
13336 struct bfd_link_info *info)
13339 const char *name, *key;
13340 struct bfd_section_already_linked *l;
13341 struct bfd_section_already_linked_hash_entry *already_linked_list;
13343 if (sec->output_section == bfd_abs_section_ptr)
13346 flags = sec->flags;
13348 /* Return if it isn't a linkonce section. A comdat group section
13349 also has SEC_LINK_ONCE set. */
13350 if ((flags & SEC_LINK_ONCE) == 0)
13353 /* Don't put group member sections on our list of already linked
13354 sections. They are handled as a group via their group section. */
13355 if (elf_sec_group (sec) != NULL)
13358 /* For a SHT_GROUP section, use the group signature as the key. */
13360 if ((flags & SEC_GROUP) != 0
13361 && elf_next_in_group (sec) != NULL
13362 && elf_group_name (elf_next_in_group (sec)) != NULL)
13363 key = elf_group_name (elf_next_in_group (sec));
13366 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
13367 if (CONST_STRNEQ (name, ".gnu.linkonce.")
13368 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
13371 /* Must be a user linkonce section that doesn't follow gcc's
13372 naming convention. In this case we won't be matching
13373 single member groups. */
13377 already_linked_list = bfd_section_already_linked_table_lookup (key);
13379 for (l = already_linked_list->entry; l != NULL; l = l->next)
13381 /* We may have 2 different types of sections on the list: group
13382 sections with a signature of <key> (<key> is some string),
13383 and linkonce sections named .gnu.linkonce.<type>.<key>.
13384 Match like sections. LTO plugin sections are an exception.
13385 They are always named .gnu.linkonce.t.<key> and match either
13386 type of section. */
13387 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
13388 && ((flags & SEC_GROUP) != 0
13389 || strcmp (name, l->sec->name) == 0))
13390 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
13392 /* The section has already been linked. See if we should
13393 issue a warning. */
13394 if (!_bfd_handle_already_linked (sec, l, info))
13397 if (flags & SEC_GROUP)
13399 asection *first = elf_next_in_group (sec);
13400 asection *s = first;
13404 s->output_section = bfd_abs_section_ptr;
13405 /* Record which group discards it. */
13406 s->kept_section = l->sec;
13407 s = elf_next_in_group (s);
13408 /* These lists are circular. */
13418 /* A single member comdat group section may be discarded by a
13419 linkonce section and vice versa. */
13420 if ((flags & SEC_GROUP) != 0)
13422 asection *first = elf_next_in_group (sec);
13424 if (first != NULL && elf_next_in_group (first) == first)
13425 /* Check this single member group against linkonce sections. */
13426 for (l = already_linked_list->entry; l != NULL; l = l->next)
13427 if ((l->sec->flags & SEC_GROUP) == 0
13428 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
13430 first->output_section = bfd_abs_section_ptr;
13431 first->kept_section = l->sec;
13432 sec->output_section = bfd_abs_section_ptr;
13437 /* Check this linkonce section against single member groups. */
13438 for (l = already_linked_list->entry; l != NULL; l = l->next)
13439 if (l->sec->flags & SEC_GROUP)
13441 asection *first = elf_next_in_group (l->sec);
13444 && elf_next_in_group (first) == first
13445 && bfd_elf_match_symbols_in_sections (first, sec, info))
13447 sec->output_section = bfd_abs_section_ptr;
13448 sec->kept_section = first;
13453 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
13454 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
13455 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
13456 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
13457 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
13458 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
13459 `.gnu.linkonce.t.F' section from a different bfd not requiring any
13460 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
13461 The reverse order cannot happen as there is never a bfd with only the
13462 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
13463 matter as here were are looking only for cross-bfd sections. */
13465 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
13466 for (l = already_linked_list->entry; l != NULL; l = l->next)
13467 if ((l->sec->flags & SEC_GROUP) == 0
13468 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
13470 if (abfd != l->sec->owner)
13471 sec->output_section = bfd_abs_section_ptr;
13475 /* This is the first section with this name. Record it. */
13476 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
13477 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
13478 return sec->output_section == bfd_abs_section_ptr;
13482 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
13484 return sym->st_shndx == SHN_COMMON;
13488 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
13494 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
13496 return bfd_com_section_ptr;
13500 _bfd_elf_default_got_elt_size (bfd *abfd,
13501 struct bfd_link_info *info ATTRIBUTE_UNUSED,
13502 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
13503 bfd *ibfd ATTRIBUTE_UNUSED,
13504 unsigned long symndx ATTRIBUTE_UNUSED)
13506 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13507 return bed->s->arch_size / 8;
13510 /* Routines to support the creation of dynamic relocs. */
13512 /* Returns the name of the dynamic reloc section associated with SEC. */
13514 static const char *
13515 get_dynamic_reloc_section_name (bfd * abfd,
13517 bfd_boolean is_rela)
13520 const char *old_name = bfd_get_section_name (NULL, sec);
13521 const char *prefix = is_rela ? ".rela" : ".rel";
13523 if (old_name == NULL)
13526 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
13527 sprintf (name, "%s%s", prefix, old_name);
13532 /* Returns the dynamic reloc section associated with SEC.
13533 If necessary compute the name of the dynamic reloc section based
13534 on SEC's name (looked up in ABFD's string table) and the setting
13538 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
13540 bfd_boolean is_rela)
13542 asection * reloc_sec = elf_section_data (sec)->sreloc;
13544 if (reloc_sec == NULL)
13546 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13550 reloc_sec = bfd_get_linker_section (abfd, name);
13552 if (reloc_sec != NULL)
13553 elf_section_data (sec)->sreloc = reloc_sec;
13560 /* Returns the dynamic reloc section associated with SEC. If the
13561 section does not exist it is created and attached to the DYNOBJ
13562 bfd and stored in the SRELOC field of SEC's elf_section_data
13565 ALIGNMENT is the alignment for the newly created section and
13566 IS_RELA defines whether the name should be .rela.<SEC's name>
13567 or .rel.<SEC's name>. The section name is looked up in the
13568 string table associated with ABFD. */
13571 _bfd_elf_make_dynamic_reloc_section (asection *sec,
13573 unsigned int alignment,
13575 bfd_boolean is_rela)
13577 asection * reloc_sec = elf_section_data (sec)->sreloc;
13579 if (reloc_sec == NULL)
13581 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13586 reloc_sec = bfd_get_linker_section (dynobj, name);
13588 if (reloc_sec == NULL)
13590 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
13591 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
13592 if ((sec->flags & SEC_ALLOC) != 0)
13593 flags |= SEC_ALLOC | SEC_LOAD;
13595 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13596 if (reloc_sec != NULL)
13598 /* _bfd_elf_get_sec_type_attr chooses a section type by
13599 name. Override as it may be wrong, eg. for a user
13600 section named "auto" we'll get ".relauto" which is
13601 seen to be a .rela section. */
13602 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13603 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13608 elf_section_data (sec)->sreloc = reloc_sec;
13614 /* Copy the ELF symbol type and other attributes for a linker script
13615 assignment from HSRC to HDEST. Generally this should be treated as
13616 if we found a strong non-dynamic definition for HDEST (except that
13617 ld ignores multiple definition errors). */
13619 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13620 struct bfd_link_hash_entry *hdest,
13621 struct bfd_link_hash_entry *hsrc)
13623 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13624 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13625 Elf_Internal_Sym isym;
13627 ehdest->type = ehsrc->type;
13628 ehdest->target_internal = ehsrc->target_internal;
13630 isym.st_other = ehsrc->other;
13631 elf_merge_st_other (abfd, ehdest, &isym, NULL, TRUE, FALSE);
13634 /* Append a RELA relocation REL to section S in BFD. */
13637 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13639 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13640 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13641 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13642 bed->s->swap_reloca_out (abfd, rel, loc);
13645 /* Append a REL relocation REL to section S in BFD. */
13648 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13650 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13651 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13652 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13653 bed->s->swap_reloc_out (abfd, rel, loc);