1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
29 #include "safe-ctype.h"
30 #include "libiberty.h"
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
38 struct bfd_link_info *info;
39 struct bfd_elf_version_tree *verdefs;
43 /* This structure is used to pass information to
44 _bfd_elf_link_find_version_dependencies. */
46 struct elf_find_verdep_info
48 /* General link information. */
49 struct bfd_link_info *info;
50 /* The number of dependencies. */
52 /* Whether we had a failure. */
56 static bfd_boolean _bfd_elf_fix_symbol_flags
57 (struct elf_link_hash_entry *, struct elf_info_failed *);
59 /* Define a symbol in a dynamic linkage section. */
61 struct elf_link_hash_entry *
62 _bfd_elf_define_linkage_sym (bfd *abfd,
63 struct bfd_link_info *info,
67 struct elf_link_hash_entry *h;
68 struct bfd_link_hash_entry *bh;
69 const struct elf_backend_data *bed;
71 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
74 /* Zap symbol defined in an as-needed lib that wasn't linked.
75 This is a symptom of a larger problem: Absolute symbols
76 defined in shared libraries can't be overridden, because we
77 lose the link to the bfd which is via the symbol section. */
78 h->root.type = bfd_link_hash_new;
82 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
84 get_elf_backend_data (abfd)->collect,
87 h = (struct elf_link_hash_entry *) bh;
90 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
92 bed = get_elf_backend_data (abfd);
93 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
98 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
102 struct elf_link_hash_entry *h;
103 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
104 struct elf_link_hash_table *htab = elf_hash_table (info);
106 /* This function may be called more than once. */
107 s = bfd_get_section_by_name (abfd, ".got");
108 if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0)
111 flags = bed->dynamic_sec_flags;
113 s = bfd_make_section_with_flags (abfd,
114 (bed->rela_plts_and_copies_p
115 ? ".rela.got" : ".rel.got"),
116 (bed->dynamic_sec_flags
119 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
123 s = bfd_make_section_with_flags (abfd, ".got", flags);
125 || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
129 if (bed->want_got_plt)
131 s = bfd_make_section_with_flags (abfd, ".got.plt", flags);
133 || !bfd_set_section_alignment (abfd, s,
134 bed->s->log_file_align))
139 /* The first bit of the global offset table is the header. */
140 s->size += bed->got_header_size;
142 if (bed->want_got_sym)
144 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
145 (or .got.plt) section. We don't do this in the linker script
146 because we don't want to define the symbol if we are not creating
147 a global offset table. */
148 h = _bfd_elf_define_linkage_sym (abfd, info, s,
149 "_GLOBAL_OFFSET_TABLE_");
150 elf_hash_table (info)->hgot = h;
158 /* Create a strtab to hold the dynamic symbol names. */
160 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
162 struct elf_link_hash_table *hash_table;
164 hash_table = elf_hash_table (info);
165 if (hash_table->dynobj == NULL)
166 hash_table->dynobj = abfd;
168 if (hash_table->dynstr == NULL)
170 hash_table->dynstr = _bfd_elf_strtab_init ();
171 if (hash_table->dynstr == NULL)
177 /* Create some sections which will be filled in with dynamic linking
178 information. ABFD is an input file which requires dynamic sections
179 to be created. The dynamic sections take up virtual memory space
180 when the final executable is run, so we need to create them before
181 addresses are assigned to the output sections. We work out the
182 actual contents and size of these sections later. */
185 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
189 const struct elf_backend_data *bed;
191 if (! is_elf_hash_table (info->hash))
194 if (elf_hash_table (info)->dynamic_sections_created)
197 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
200 abfd = elf_hash_table (info)->dynobj;
201 bed = get_elf_backend_data (abfd);
203 flags = bed->dynamic_sec_flags;
205 /* A dynamically linked executable has a .interp section, but a
206 shared library does not. */
207 if (info->executable)
209 s = bfd_make_section_with_flags (abfd, ".interp",
210 flags | SEC_READONLY);
215 /* Create sections to hold version informations. These are removed
216 if they are not needed. */
217 s = bfd_make_section_with_flags (abfd, ".gnu.version_d",
218 flags | SEC_READONLY);
220 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
223 s = bfd_make_section_with_flags (abfd, ".gnu.version",
224 flags | SEC_READONLY);
226 || ! bfd_set_section_alignment (abfd, s, 1))
229 s = bfd_make_section_with_flags (abfd, ".gnu.version_r",
230 flags | SEC_READONLY);
232 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
235 s = bfd_make_section_with_flags (abfd, ".dynsym",
236 flags | SEC_READONLY);
238 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
241 s = bfd_make_section_with_flags (abfd, ".dynstr",
242 flags | SEC_READONLY);
246 s = bfd_make_section_with_flags (abfd, ".dynamic", flags);
248 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
251 /* The special symbol _DYNAMIC is always set to the start of the
252 .dynamic section. We could set _DYNAMIC in a linker script, but we
253 only want to define it if we are, in fact, creating a .dynamic
254 section. We don't want to define it if there is no .dynamic
255 section, since on some ELF platforms the start up code examines it
256 to decide how to initialize the process. */
257 if (!_bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC"))
262 s = bfd_make_section_with_flags (abfd, ".hash", flags | SEC_READONLY);
264 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
266 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
269 if (info->emit_gnu_hash)
271 s = bfd_make_section_with_flags (abfd, ".gnu.hash",
272 flags | SEC_READONLY);
274 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
276 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
277 4 32-bit words followed by variable count of 64-bit words, then
278 variable count of 32-bit words. */
279 if (bed->s->arch_size == 64)
280 elf_section_data (s)->this_hdr.sh_entsize = 0;
282 elf_section_data (s)->this_hdr.sh_entsize = 4;
285 /* Let the backend create the rest of the sections. This lets the
286 backend set the right flags. The backend will normally create
287 the .got and .plt sections. */
288 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
291 elf_hash_table (info)->dynamic_sections_created = TRUE;
296 /* Create dynamic sections when linking against a dynamic object. */
299 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
301 flagword flags, pltflags;
302 struct elf_link_hash_entry *h;
304 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
305 struct elf_link_hash_table *htab = elf_hash_table (info);
307 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
308 .rel[a].bss sections. */
309 flags = bed->dynamic_sec_flags;
312 if (bed->plt_not_loaded)
313 /* We do not clear SEC_ALLOC here because we still want the OS to
314 allocate space for the section; it's just that there's nothing
315 to read in from the object file. */
316 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
318 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
319 if (bed->plt_readonly)
320 pltflags |= SEC_READONLY;
322 s = bfd_make_section_with_flags (abfd, ".plt", pltflags);
324 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
328 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
330 if (bed->want_plt_sym)
332 h = _bfd_elf_define_linkage_sym (abfd, info, s,
333 "_PROCEDURE_LINKAGE_TABLE_");
334 elf_hash_table (info)->hplt = h;
339 s = bfd_make_section_with_flags (abfd,
340 (bed->rela_plts_and_copies_p
341 ? ".rela.plt" : ".rel.plt"),
342 flags | SEC_READONLY);
344 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
348 if (! _bfd_elf_create_got_section (abfd, info))
351 if (bed->want_dynbss)
353 /* The .dynbss section is a place to put symbols which are defined
354 by dynamic objects, are referenced by regular objects, and are
355 not functions. We must allocate space for them in the process
356 image and use a R_*_COPY reloc to tell the dynamic linker to
357 initialize them at run time. The linker script puts the .dynbss
358 section into the .bss section of the final image. */
359 s = bfd_make_section_with_flags (abfd, ".dynbss",
361 | SEC_LINKER_CREATED));
365 /* The .rel[a].bss section holds copy relocs. This section is not
366 normally needed. We need to create it here, though, so that the
367 linker will map it to an output section. We can't just create it
368 only if we need it, because we will not know whether we need it
369 until we have seen all the input files, and the first time the
370 main linker code calls BFD after examining all the input files
371 (size_dynamic_sections) the input sections have already been
372 mapped to the output sections. If the section turns out not to
373 be needed, we can discard it later. We will never need this
374 section when generating a shared object, since they do not use
378 s = bfd_make_section_with_flags (abfd,
379 (bed->rela_plts_and_copies_p
380 ? ".rela.bss" : ".rel.bss"),
381 flags | SEC_READONLY);
383 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
391 /* Record a new dynamic symbol. We record the dynamic symbols as we
392 read the input files, since we need to have a list of all of them
393 before we can determine the final sizes of the output sections.
394 Note that we may actually call this function even though we are not
395 going to output any dynamic symbols; in some cases we know that a
396 symbol should be in the dynamic symbol table, but only if there is
400 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
401 struct elf_link_hash_entry *h)
403 if (h->dynindx == -1)
405 struct elf_strtab_hash *dynstr;
410 /* XXX: The ABI draft says the linker must turn hidden and
411 internal symbols into STB_LOCAL symbols when producing the
412 DSO. However, if ld.so honors st_other in the dynamic table,
413 this would not be necessary. */
414 switch (ELF_ST_VISIBILITY (h->other))
418 if (h->root.type != bfd_link_hash_undefined
419 && h->root.type != bfd_link_hash_undefweak)
422 if (!elf_hash_table (info)->is_relocatable_executable)
430 h->dynindx = elf_hash_table (info)->dynsymcount;
431 ++elf_hash_table (info)->dynsymcount;
433 dynstr = elf_hash_table (info)->dynstr;
436 /* Create a strtab to hold the dynamic symbol names. */
437 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
442 /* We don't put any version information in the dynamic string
444 name = h->root.root.string;
445 p = strchr (name, ELF_VER_CHR);
447 /* We know that the p points into writable memory. In fact,
448 there are only a few symbols that have read-only names, being
449 those like _GLOBAL_OFFSET_TABLE_ that are created specially
450 by the backends. Most symbols will have names pointing into
451 an ELF string table read from a file, or to objalloc memory. */
454 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
459 if (indx == (bfd_size_type) -1)
461 h->dynstr_index = indx;
467 /* Mark a symbol dynamic. */
470 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
471 struct elf_link_hash_entry *h,
472 Elf_Internal_Sym *sym)
474 struct bfd_elf_dynamic_list *d = info->dynamic_list;
476 /* It may be called more than once on the same H. */
477 if(h->dynamic || info->relocatable)
480 if ((info->dynamic_data
481 && (h->type == STT_OBJECT
483 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
485 && h->root.type == bfd_link_hash_new
486 && (*d->match) (&d->head, NULL, h->root.root.string)))
490 /* Record an assignment to a symbol made by a linker script. We need
491 this in case some dynamic object refers to this symbol. */
494 bfd_elf_record_link_assignment (bfd *output_bfd,
495 struct bfd_link_info *info,
500 struct elf_link_hash_entry *h, *hv;
501 struct elf_link_hash_table *htab;
502 const struct elf_backend_data *bed;
504 if (!is_elf_hash_table (info->hash))
507 htab = elf_hash_table (info);
508 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
512 switch (h->root.type)
514 case bfd_link_hash_defined:
515 case bfd_link_hash_defweak:
516 case bfd_link_hash_common:
518 case bfd_link_hash_undefweak:
519 case bfd_link_hash_undefined:
520 /* Since we're defining the symbol, don't let it seem to have not
521 been defined. record_dynamic_symbol and size_dynamic_sections
522 may depend on this. */
523 h->root.type = bfd_link_hash_new;
524 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
525 bfd_link_repair_undef_list (&htab->root);
527 case bfd_link_hash_new:
528 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
531 case bfd_link_hash_indirect:
532 /* We had a versioned symbol in a dynamic library. We make the
533 the versioned symbol point to this one. */
534 bed = get_elf_backend_data (output_bfd);
536 while (hv->root.type == bfd_link_hash_indirect
537 || hv->root.type == bfd_link_hash_warning)
538 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
539 /* We don't need to update h->root.u since linker will set them
541 h->root.type = bfd_link_hash_undefined;
542 hv->root.type = bfd_link_hash_indirect;
543 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
544 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
546 case bfd_link_hash_warning:
551 /* If this symbol is being provided by the linker script, and it is
552 currently defined by a dynamic object, but not by a regular
553 object, then mark it as undefined so that the generic linker will
554 force the correct value. */
558 h->root.type = bfd_link_hash_undefined;
560 /* If this symbol is not being provided by the linker script, and it is
561 currently defined by a dynamic object, but not by a regular object,
562 then clear out any version information because the symbol will not be
563 associated with the dynamic object any more. */
567 h->verinfo.verdef = NULL;
571 if (provide && hidden)
573 bed = get_elf_backend_data (output_bfd);
574 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
575 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
578 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
580 if (!info->relocatable
582 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
583 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
589 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
592 if (! bfd_elf_link_record_dynamic_symbol (info, h))
595 /* If this is a weak defined symbol, and we know a corresponding
596 real symbol from the same dynamic object, make sure the real
597 symbol is also made into a dynamic symbol. */
598 if (h->u.weakdef != NULL
599 && h->u.weakdef->dynindx == -1)
601 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
609 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
610 success, and 2 on a failure caused by attempting to record a symbol
611 in a discarded section, eg. a discarded link-once section symbol. */
614 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
619 struct elf_link_local_dynamic_entry *entry;
620 struct elf_link_hash_table *eht;
621 struct elf_strtab_hash *dynstr;
622 unsigned long dynstr_index;
624 Elf_External_Sym_Shndx eshndx;
625 char esym[sizeof (Elf64_External_Sym)];
627 if (! is_elf_hash_table (info->hash))
630 /* See if the entry exists already. */
631 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
632 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
635 amt = sizeof (*entry);
636 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
640 /* Go find the symbol, so that we can find it's name. */
641 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
642 1, input_indx, &entry->isym, esym, &eshndx))
644 bfd_release (input_bfd, entry);
648 if (entry->isym.st_shndx != SHN_UNDEF
649 && entry->isym.st_shndx < SHN_LORESERVE)
653 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
654 if (s == NULL || bfd_is_abs_section (s->output_section))
656 /* We can still bfd_release here as nothing has done another
657 bfd_alloc. We can't do this later in this function. */
658 bfd_release (input_bfd, entry);
663 name = (bfd_elf_string_from_elf_section
664 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
665 entry->isym.st_name));
667 dynstr = elf_hash_table (info)->dynstr;
670 /* Create a strtab to hold the dynamic symbol names. */
671 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
676 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
677 if (dynstr_index == (unsigned long) -1)
679 entry->isym.st_name = dynstr_index;
681 eht = elf_hash_table (info);
683 entry->next = eht->dynlocal;
684 eht->dynlocal = entry;
685 entry->input_bfd = input_bfd;
686 entry->input_indx = input_indx;
689 /* Whatever binding the symbol had before, it's now local. */
691 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
693 /* The dynindx will be set at the end of size_dynamic_sections. */
698 /* Return the dynindex of a local dynamic symbol. */
701 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
705 struct elf_link_local_dynamic_entry *e;
707 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
708 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
713 /* This function is used to renumber the dynamic symbols, if some of
714 them are removed because they are marked as local. This is called
715 via elf_link_hash_traverse. */
718 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
721 size_t *count = (size_t *) data;
723 if (h->root.type == bfd_link_hash_warning)
724 h = (struct elf_link_hash_entry *) h->root.u.i.link;
729 if (h->dynindx != -1)
730 h->dynindx = ++(*count);
736 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
737 STB_LOCAL binding. */
740 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
743 size_t *count = (size_t *) data;
745 if (h->root.type == bfd_link_hash_warning)
746 h = (struct elf_link_hash_entry *) h->root.u.i.link;
748 if (!h->forced_local)
751 if (h->dynindx != -1)
752 h->dynindx = ++(*count);
757 /* Return true if the dynamic symbol for a given section should be
758 omitted when creating a shared library. */
760 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
761 struct bfd_link_info *info,
764 struct elf_link_hash_table *htab;
766 switch (elf_section_data (p)->this_hdr.sh_type)
770 /* If sh_type is yet undecided, assume it could be
771 SHT_PROGBITS/SHT_NOBITS. */
773 htab = elf_hash_table (info);
774 if (p == htab->tls_sec)
777 if (htab->text_index_section != NULL)
778 return p != htab->text_index_section && p != htab->data_index_section;
780 if (strcmp (p->name, ".got") == 0
781 || strcmp (p->name, ".got.plt") == 0
782 || strcmp (p->name, ".plt") == 0)
786 if (htab->dynobj != NULL
787 && (ip = bfd_get_section_by_name (htab->dynobj, p->name)) != NULL
788 && (ip->flags & SEC_LINKER_CREATED)
789 && ip->output_section == p)
794 /* There shouldn't be section relative relocations
795 against any other section. */
801 /* Assign dynsym indices. In a shared library we generate a section
802 symbol for each output section, which come first. Next come symbols
803 which have been forced to local binding. Then all of the back-end
804 allocated local dynamic syms, followed by the rest of the global
808 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
809 struct bfd_link_info *info,
810 unsigned long *section_sym_count)
812 unsigned long dynsymcount = 0;
814 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
816 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
818 for (p = output_bfd->sections; p ; p = p->next)
819 if ((p->flags & SEC_EXCLUDE) == 0
820 && (p->flags & SEC_ALLOC) != 0
821 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
822 elf_section_data (p)->dynindx = ++dynsymcount;
824 elf_section_data (p)->dynindx = 0;
826 *section_sym_count = dynsymcount;
828 elf_link_hash_traverse (elf_hash_table (info),
829 elf_link_renumber_local_hash_table_dynsyms,
832 if (elf_hash_table (info)->dynlocal)
834 struct elf_link_local_dynamic_entry *p;
835 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
836 p->dynindx = ++dynsymcount;
839 elf_link_hash_traverse (elf_hash_table (info),
840 elf_link_renumber_hash_table_dynsyms,
843 /* There is an unused NULL entry at the head of the table which
844 we must account for in our count. Unless there weren't any
845 symbols, which means we'll have no table at all. */
846 if (dynsymcount != 0)
849 elf_hash_table (info)->dynsymcount = dynsymcount;
853 /* Merge st_other field. */
856 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
857 Elf_Internal_Sym *isym, bfd_boolean definition,
860 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
862 /* If st_other has a processor-specific meaning, specific
863 code might be needed here. We never merge the visibility
864 attribute with the one from a dynamic object. */
865 if (bed->elf_backend_merge_symbol_attribute)
866 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
869 /* If this symbol has default visibility and the user has requested
870 we not re-export it, then mark it as hidden. */
874 || (abfd->my_archive && abfd->my_archive->no_export))
875 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
876 isym->st_other = (STV_HIDDEN
877 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
879 if (!dynamic && ELF_ST_VISIBILITY (isym->st_other) != 0)
881 unsigned char hvis, symvis, other, nvis;
883 /* Only merge the visibility. Leave the remainder of the
884 st_other field to elf_backend_merge_symbol_attribute. */
885 other = h->other & ~ELF_ST_VISIBILITY (-1);
887 /* Combine visibilities, using the most constraining one. */
888 hvis = ELF_ST_VISIBILITY (h->other);
889 symvis = ELF_ST_VISIBILITY (isym->st_other);
895 nvis = hvis < symvis ? hvis : symvis;
897 h->other = other | nvis;
901 /* This function is called when we want to define a new symbol. It
902 handles the various cases which arise when we find a definition in
903 a dynamic object, or when there is already a definition in a
904 dynamic object. The new symbol is described by NAME, SYM, PSEC,
905 and PVALUE. We set SYM_HASH to the hash table entry. We set
906 OVERRIDE if the old symbol is overriding a new definition. We set
907 TYPE_CHANGE_OK if it is OK for the type to change. We set
908 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
909 change, we mean that we shouldn't warn if the type or size does
910 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
911 object is overridden by a regular object. */
914 _bfd_elf_merge_symbol (bfd *abfd,
915 struct bfd_link_info *info,
917 Elf_Internal_Sym *sym,
920 unsigned int *pold_alignment,
921 struct elf_link_hash_entry **sym_hash,
923 bfd_boolean *override,
924 bfd_boolean *type_change_ok,
925 bfd_boolean *size_change_ok)
927 asection *sec, *oldsec;
928 struct elf_link_hash_entry *h;
929 struct elf_link_hash_entry *flip;
932 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
933 bfd_boolean newweak, oldweak, newfunc, oldfunc;
934 const struct elf_backend_data *bed;
940 bind = ELF_ST_BIND (sym->st_info);
942 /* Silently discard TLS symbols from --just-syms. There's no way to
943 combine a static TLS block with a new TLS block for this executable. */
944 if (ELF_ST_TYPE (sym->st_info) == STT_TLS
945 && sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
951 if (! bfd_is_und_section (sec))
952 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
954 h = ((struct elf_link_hash_entry *)
955 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
960 bed = get_elf_backend_data (abfd);
962 /* This code is for coping with dynamic objects, and is only useful
963 if we are doing an ELF link. */
964 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
967 /* For merging, we only care about real symbols. */
969 while (h->root.type == bfd_link_hash_indirect
970 || h->root.type == bfd_link_hash_warning)
971 h = (struct elf_link_hash_entry *) h->root.u.i.link;
973 /* We have to check it for every instance since the first few may be
974 refereences and not all compilers emit symbol type for undefined
976 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
978 /* If we just created the symbol, mark it as being an ELF symbol.
979 Other than that, there is nothing to do--there is no merge issue
980 with a newly defined symbol--so we just return. */
982 if (h->root.type == bfd_link_hash_new)
988 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
991 switch (h->root.type)
998 case bfd_link_hash_undefined:
999 case bfd_link_hash_undefweak:
1000 oldbfd = h->root.u.undef.abfd;
1004 case bfd_link_hash_defined:
1005 case bfd_link_hash_defweak:
1006 oldbfd = h->root.u.def.section->owner;
1007 oldsec = h->root.u.def.section;
1010 case bfd_link_hash_common:
1011 oldbfd = h->root.u.c.p->section->owner;
1012 oldsec = h->root.u.c.p->section;
1016 /* Differentiate strong and weak symbols. */
1017 newweak = bind == STB_WEAK;
1018 oldweak = (h->root.type == bfd_link_hash_defweak
1019 || h->root.type == bfd_link_hash_undefweak);
1021 /* In cases involving weak versioned symbols, we may wind up trying
1022 to merge a symbol with itself. Catch that here, to avoid the
1023 confusion that results if we try to override a symbol with
1024 itself. The additional tests catch cases like
1025 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1026 dynamic object, which we do want to handle here. */
1028 && (newweak || oldweak)
1029 && ((abfd->flags & DYNAMIC) == 0
1030 || !h->def_regular))
1033 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1034 respectively, is from a dynamic object. */
1036 newdyn = (abfd->flags & DYNAMIC) != 0;
1040 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1041 else if (oldsec != NULL)
1043 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1044 indices used by MIPS ELF. */
1045 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1048 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1049 respectively, appear to be a definition rather than reference. */
1051 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1053 olddef = (h->root.type != bfd_link_hash_undefined
1054 && h->root.type != bfd_link_hash_undefweak
1055 && h->root.type != bfd_link_hash_common);
1057 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1058 respectively, appear to be a function. */
1060 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1061 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1063 oldfunc = (h->type != STT_NOTYPE
1064 && bed->is_function_type (h->type));
1066 /* When we try to create a default indirect symbol from the dynamic
1067 definition with the default version, we skip it if its type and
1068 the type of existing regular definition mismatch. We only do it
1069 if the existing regular definition won't be dynamic. */
1070 if (pold_alignment == NULL
1072 && !info->export_dynamic
1077 && (olddef || h->root.type == bfd_link_hash_common)
1078 && ELF_ST_TYPE (sym->st_info) != h->type
1079 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1080 && h->type != STT_NOTYPE
1081 && !(newfunc && oldfunc))
1087 /* Check TLS symbol. We don't check undefined symbol introduced by
1089 if ((ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS)
1090 && ELF_ST_TYPE (sym->st_info) != h->type
1094 bfd_boolean ntdef, tdef;
1095 asection *ntsec, *tsec;
1097 if (h->type == STT_TLS)
1117 (*_bfd_error_handler)
1118 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1119 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1120 else if (!tdef && !ntdef)
1121 (*_bfd_error_handler)
1122 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1123 tbfd, ntbfd, h->root.root.string);
1125 (*_bfd_error_handler)
1126 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1127 tbfd, tsec, ntbfd, h->root.root.string);
1129 (*_bfd_error_handler)
1130 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1131 tbfd, ntbfd, ntsec, h->root.root.string);
1133 bfd_set_error (bfd_error_bad_value);
1137 /* We need to remember if a symbol has a definition in a dynamic
1138 object or is weak in all dynamic objects. Internal and hidden
1139 visibility will make it unavailable to dynamic objects. */
1140 if (newdyn && !h->dynamic_def)
1142 if (!bfd_is_und_section (sec))
1146 /* Check if this symbol is weak in all dynamic objects. If it
1147 is the first time we see it in a dynamic object, we mark
1148 if it is weak. Otherwise, we clear it. */
1149 if (!h->ref_dynamic)
1151 if (bind == STB_WEAK)
1152 h->dynamic_weak = 1;
1154 else if (bind != STB_WEAK)
1155 h->dynamic_weak = 0;
1159 /* If the old symbol has non-default visibility, we ignore the new
1160 definition from a dynamic object. */
1162 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1163 && !bfd_is_und_section (sec))
1166 /* Make sure this symbol is dynamic. */
1168 /* A protected symbol has external availability. Make sure it is
1169 recorded as dynamic.
1171 FIXME: Should we check type and size for protected symbol? */
1172 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1173 return bfd_elf_link_record_dynamic_symbol (info, h);
1178 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1181 /* If the new symbol with non-default visibility comes from a
1182 relocatable file and the old definition comes from a dynamic
1183 object, we remove the old definition. */
1184 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1186 /* Handle the case where the old dynamic definition is
1187 default versioned. We need to copy the symbol info from
1188 the symbol with default version to the normal one if it
1189 was referenced before. */
1192 struct elf_link_hash_entry *vh = *sym_hash;
1194 vh->root.type = h->root.type;
1195 h->root.type = bfd_link_hash_indirect;
1196 (*bed->elf_backend_copy_indirect_symbol) (info, vh, h);
1197 /* Protected symbols will override the dynamic definition
1198 with default version. */
1199 if (ELF_ST_VISIBILITY (sym->st_other) == STV_PROTECTED)
1201 h->root.u.i.link = (struct bfd_link_hash_entry *) vh;
1202 vh->dynamic_def = 1;
1203 vh->ref_dynamic = 1;
1207 h->root.type = vh->root.type;
1208 vh->ref_dynamic = 0;
1209 /* We have to hide it here since it was made dynamic
1210 global with extra bits when the symbol info was
1211 copied from the old dynamic definition. */
1212 (*bed->elf_backend_hide_symbol) (info, vh, TRUE);
1220 if ((h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1221 && bfd_is_und_section (sec))
1223 /* If the new symbol is undefined and the old symbol was
1224 also undefined before, we need to make sure
1225 _bfd_generic_link_add_one_symbol doesn't mess
1226 up the linker hash table undefs list. Since the old
1227 definition came from a dynamic object, it is still on the
1229 h->root.type = bfd_link_hash_undefined;
1230 h->root.u.undef.abfd = abfd;
1234 h->root.type = bfd_link_hash_new;
1235 h->root.u.undef.abfd = NULL;
1244 /* FIXME: Should we check type and size for protected symbol? */
1250 if (bind == STB_GNU_UNIQUE)
1251 h->unique_global = 1;
1253 /* If a new weak symbol definition comes from a regular file and the
1254 old symbol comes from a dynamic library, we treat the new one as
1255 strong. Similarly, an old weak symbol definition from a regular
1256 file is treated as strong when the new symbol comes from a dynamic
1257 library. Further, an old weak symbol from a dynamic library is
1258 treated as strong if the new symbol is from a dynamic library.
1259 This reflects the way glibc's ld.so works.
1261 Do this before setting *type_change_ok or *size_change_ok so that
1262 we warn properly when dynamic library symbols are overridden. */
1264 if (newdef && !newdyn && olddyn)
1266 if (olddef && newdyn)
1269 /* Allow changes between different types of function symbol. */
1270 if (newfunc && oldfunc)
1271 *type_change_ok = TRUE;
1273 /* It's OK to change the type if either the existing symbol or the
1274 new symbol is weak. A type change is also OK if the old symbol
1275 is undefined and the new symbol is defined. */
1280 && h->root.type == bfd_link_hash_undefined))
1281 *type_change_ok = TRUE;
1283 /* It's OK to change the size if either the existing symbol or the
1284 new symbol is weak, or if the old symbol is undefined. */
1287 || h->root.type == bfd_link_hash_undefined)
1288 *size_change_ok = TRUE;
1290 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1291 symbol, respectively, appears to be a common symbol in a dynamic
1292 object. If a symbol appears in an uninitialized section, and is
1293 not weak, and is not a function, then it may be a common symbol
1294 which was resolved when the dynamic object was created. We want
1295 to treat such symbols specially, because they raise special
1296 considerations when setting the symbol size: if the symbol
1297 appears as a common symbol in a regular object, and the size in
1298 the regular object is larger, we must make sure that we use the
1299 larger size. This problematic case can always be avoided in C,
1300 but it must be handled correctly when using Fortran shared
1303 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1304 likewise for OLDDYNCOMMON and OLDDEF.
1306 Note that this test is just a heuristic, and that it is quite
1307 possible to have an uninitialized symbol in a shared object which
1308 is really a definition, rather than a common symbol. This could
1309 lead to some minor confusion when the symbol really is a common
1310 symbol in some regular object. However, I think it will be
1316 && (sec->flags & SEC_ALLOC) != 0
1317 && (sec->flags & SEC_LOAD) == 0
1320 newdyncommon = TRUE;
1322 newdyncommon = FALSE;
1326 && h->root.type == bfd_link_hash_defined
1328 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1329 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1332 olddyncommon = TRUE;
1334 olddyncommon = FALSE;
1336 /* We now know everything about the old and new symbols. We ask the
1337 backend to check if we can merge them. */
1338 if (bed->merge_symbol
1339 && !bed->merge_symbol (info, sym_hash, h, sym, psec, pvalue,
1340 pold_alignment, skip, override,
1341 type_change_ok, size_change_ok,
1342 &newdyn, &newdef, &newdyncommon, &newweak,
1344 &olddyn, &olddef, &olddyncommon, &oldweak,
1348 /* If both the old and the new symbols look like common symbols in a
1349 dynamic object, set the size of the symbol to the larger of the
1354 && sym->st_size != h->size)
1356 /* Since we think we have two common symbols, issue a multiple
1357 common warning if desired. Note that we only warn if the
1358 size is different. If the size is the same, we simply let
1359 the old symbol override the new one as normally happens with
1360 symbols defined in dynamic objects. */
1362 if (! ((*info->callbacks->multiple_common)
1363 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
1364 h->size, abfd, bfd_link_hash_common, sym->st_size)))
1367 if (sym->st_size > h->size)
1368 h->size = sym->st_size;
1370 *size_change_ok = TRUE;
1373 /* If we are looking at a dynamic object, and we have found a
1374 definition, we need to see if the symbol was already defined by
1375 some other object. If so, we want to use the existing
1376 definition, and we do not want to report a multiple symbol
1377 definition error; we do this by clobbering *PSEC to be
1378 bfd_und_section_ptr.
1380 We treat a common symbol as a definition if the symbol in the
1381 shared library is a function, since common symbols always
1382 represent variables; this can cause confusion in principle, but
1383 any such confusion would seem to indicate an erroneous program or
1384 shared library. We also permit a common symbol in a regular
1385 object to override a weak symbol in a shared object. */
1390 || (h->root.type == bfd_link_hash_common
1391 && (newweak || newfunc))))
1395 newdyncommon = FALSE;
1397 *psec = sec = bfd_und_section_ptr;
1398 *size_change_ok = TRUE;
1400 /* If we get here when the old symbol is a common symbol, then
1401 we are explicitly letting it override a weak symbol or
1402 function in a dynamic object, and we don't want to warn about
1403 a type change. If the old symbol is a defined symbol, a type
1404 change warning may still be appropriate. */
1406 if (h->root.type == bfd_link_hash_common)
1407 *type_change_ok = TRUE;
1410 /* Handle the special case of an old common symbol merging with a
1411 new symbol which looks like a common symbol in a shared object.
1412 We change *PSEC and *PVALUE to make the new symbol look like a
1413 common symbol, and let _bfd_generic_link_add_one_symbol do the
1417 && h->root.type == bfd_link_hash_common)
1421 newdyncommon = FALSE;
1422 *pvalue = sym->st_size;
1423 *psec = sec = bed->common_section (oldsec);
1424 *size_change_ok = TRUE;
1427 /* Skip weak definitions of symbols that are already defined. */
1428 if (newdef && olddef && newweak)
1432 /* Merge st_other. If the symbol already has a dynamic index,
1433 but visibility says it should not be visible, turn it into a
1435 elf_merge_st_other (abfd, h, sym, newdef, newdyn);
1436 if (h->dynindx != -1)
1437 switch (ELF_ST_VISIBILITY (h->other))
1441 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1446 /* If the old symbol is from a dynamic object, and the new symbol is
1447 a definition which is not from a dynamic object, then the new
1448 symbol overrides the old symbol. Symbols from regular files
1449 always take precedence over symbols from dynamic objects, even if
1450 they are defined after the dynamic object in the link.
1452 As above, we again permit a common symbol in a regular object to
1453 override a definition in a shared object if the shared object
1454 symbol is a function or is weak. */
1459 || (bfd_is_com_section (sec)
1460 && (oldweak || oldfunc)))
1465 /* Change the hash table entry to undefined, and let
1466 _bfd_generic_link_add_one_symbol do the right thing with the
1469 h->root.type = bfd_link_hash_undefined;
1470 h->root.u.undef.abfd = h->root.u.def.section->owner;
1471 *size_change_ok = TRUE;
1474 olddyncommon = FALSE;
1476 /* We again permit a type change when a common symbol may be
1477 overriding a function. */
1479 if (bfd_is_com_section (sec))
1483 /* If a common symbol overrides a function, make sure
1484 that it isn't defined dynamically nor has type
1487 h->type = STT_NOTYPE;
1489 *type_change_ok = TRUE;
1492 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1495 /* This union may have been set to be non-NULL when this symbol
1496 was seen in a dynamic object. We must force the union to be
1497 NULL, so that it is correct for a regular symbol. */
1498 h->verinfo.vertree = NULL;
1501 /* Handle the special case of a new common symbol merging with an
1502 old symbol that looks like it might be a common symbol defined in
1503 a shared object. Note that we have already handled the case in
1504 which a new common symbol should simply override the definition
1505 in the shared library. */
1508 && bfd_is_com_section (sec)
1511 /* It would be best if we could set the hash table entry to a
1512 common symbol, but we don't know what to use for the section
1513 or the alignment. */
1514 if (! ((*info->callbacks->multiple_common)
1515 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
1516 h->size, abfd, bfd_link_hash_common, sym->st_size)))
1519 /* If the presumed common symbol in the dynamic object is
1520 larger, pretend that the new symbol has its size. */
1522 if (h->size > *pvalue)
1525 /* We need to remember the alignment required by the symbol
1526 in the dynamic object. */
1527 BFD_ASSERT (pold_alignment);
1528 *pold_alignment = h->root.u.def.section->alignment_power;
1531 olddyncommon = FALSE;
1533 h->root.type = bfd_link_hash_undefined;
1534 h->root.u.undef.abfd = h->root.u.def.section->owner;
1536 *size_change_ok = TRUE;
1537 *type_change_ok = TRUE;
1539 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1542 h->verinfo.vertree = NULL;
1547 /* Handle the case where we had a versioned symbol in a dynamic
1548 library and now find a definition in a normal object. In this
1549 case, we make the versioned symbol point to the normal one. */
1550 flip->root.type = h->root.type;
1551 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1552 h->root.type = bfd_link_hash_indirect;
1553 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1554 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1558 flip->ref_dynamic = 1;
1565 /* This function is called to create an indirect symbol from the
1566 default for the symbol with the default version if needed. The
1567 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1568 set DYNSYM if the new indirect symbol is dynamic. */
1571 _bfd_elf_add_default_symbol (bfd *abfd,
1572 struct bfd_link_info *info,
1573 struct elf_link_hash_entry *h,
1575 Elf_Internal_Sym *sym,
1578 bfd_boolean *dynsym,
1579 bfd_boolean override)
1581 bfd_boolean type_change_ok;
1582 bfd_boolean size_change_ok;
1585 struct elf_link_hash_entry *hi;
1586 struct bfd_link_hash_entry *bh;
1587 const struct elf_backend_data *bed;
1588 bfd_boolean collect;
1589 bfd_boolean dynamic;
1591 size_t len, shortlen;
1594 /* If this symbol has a version, and it is the default version, we
1595 create an indirect symbol from the default name to the fully
1596 decorated name. This will cause external references which do not
1597 specify a version to be bound to this version of the symbol. */
1598 p = strchr (name, ELF_VER_CHR);
1599 if (p == NULL || p[1] != ELF_VER_CHR)
1604 /* We are overridden by an old definition. We need to check if we
1605 need to create the indirect symbol from the default name. */
1606 hi = elf_link_hash_lookup (elf_hash_table (info), name, TRUE,
1608 BFD_ASSERT (hi != NULL);
1611 while (hi->root.type == bfd_link_hash_indirect
1612 || hi->root.type == bfd_link_hash_warning)
1614 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1620 bed = get_elf_backend_data (abfd);
1621 collect = bed->collect;
1622 dynamic = (abfd->flags & DYNAMIC) != 0;
1624 shortlen = p - name;
1625 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1626 if (shortname == NULL)
1628 memcpy (shortname, name, shortlen);
1629 shortname[shortlen] = '\0';
1631 /* We are going to create a new symbol. Merge it with any existing
1632 symbol with this name. For the purposes of the merge, act as
1633 though we were defining the symbol we just defined, although we
1634 actually going to define an indirect symbol. */
1635 type_change_ok = FALSE;
1636 size_change_ok = FALSE;
1638 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1639 NULL, &hi, &skip, &override,
1640 &type_change_ok, &size_change_ok))
1649 if (! (_bfd_generic_link_add_one_symbol
1650 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1651 0, name, FALSE, collect, &bh)))
1653 hi = (struct elf_link_hash_entry *) bh;
1657 /* In this case the symbol named SHORTNAME is overriding the
1658 indirect symbol we want to add. We were planning on making
1659 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1660 is the name without a version. NAME is the fully versioned
1661 name, and it is the default version.
1663 Overriding means that we already saw a definition for the
1664 symbol SHORTNAME in a regular object, and it is overriding
1665 the symbol defined in the dynamic object.
1667 When this happens, we actually want to change NAME, the
1668 symbol we just added, to refer to SHORTNAME. This will cause
1669 references to NAME in the shared object to become references
1670 to SHORTNAME in the regular object. This is what we expect
1671 when we override a function in a shared object: that the
1672 references in the shared object will be mapped to the
1673 definition in the regular object. */
1675 while (hi->root.type == bfd_link_hash_indirect
1676 || hi->root.type == bfd_link_hash_warning)
1677 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1679 h->root.type = bfd_link_hash_indirect;
1680 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1684 hi->ref_dynamic = 1;
1688 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1693 /* Now set HI to H, so that the following code will set the
1694 other fields correctly. */
1698 /* Check if HI is a warning symbol. */
1699 if (hi->root.type == bfd_link_hash_warning)
1700 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1702 /* If there is a duplicate definition somewhere, then HI may not
1703 point to an indirect symbol. We will have reported an error to
1704 the user in that case. */
1706 if (hi->root.type == bfd_link_hash_indirect)
1708 struct elf_link_hash_entry *ht;
1710 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1711 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1713 /* See if the new flags lead us to realize that the symbol must
1719 if (! info->executable
1725 if (hi->ref_regular)
1731 /* We also need to define an indirection from the nondefault version
1735 len = strlen (name);
1736 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1737 if (shortname == NULL)
1739 memcpy (shortname, name, shortlen);
1740 memcpy (shortname + shortlen, p + 1, len - shortlen);
1742 /* Once again, merge with any existing symbol. */
1743 type_change_ok = FALSE;
1744 size_change_ok = FALSE;
1746 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1747 NULL, &hi, &skip, &override,
1748 &type_change_ok, &size_change_ok))
1756 /* Here SHORTNAME is a versioned name, so we don't expect to see
1757 the type of override we do in the case above unless it is
1758 overridden by a versioned definition. */
1759 if (hi->root.type != bfd_link_hash_defined
1760 && hi->root.type != bfd_link_hash_defweak)
1761 (*_bfd_error_handler)
1762 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1768 if (! (_bfd_generic_link_add_one_symbol
1769 (info, abfd, shortname, BSF_INDIRECT,
1770 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1772 hi = (struct elf_link_hash_entry *) bh;
1774 /* If there is a duplicate definition somewhere, then HI may not
1775 point to an indirect symbol. We will have reported an error
1776 to the user in that case. */
1778 if (hi->root.type == bfd_link_hash_indirect)
1780 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1782 /* See if the new flags lead us to realize that the symbol
1788 if (! info->executable
1794 if (hi->ref_regular)
1804 /* This routine is used to export all defined symbols into the dynamic
1805 symbol table. It is called via elf_link_hash_traverse. */
1808 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1810 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1812 /* Ignore this if we won't export it. */
1813 if (!eif->info->export_dynamic && !h->dynamic)
1816 /* Ignore indirect symbols. These are added by the versioning code. */
1817 if (h->root.type == bfd_link_hash_indirect)
1820 if (h->root.type == bfd_link_hash_warning)
1821 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1823 if (h->dynindx == -1
1829 if (eif->verdefs == NULL
1830 || (bfd_find_version_for_sym (eif->verdefs, h->root.root.string, &hide)
1833 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1844 /* Look through the symbols which are defined in other shared
1845 libraries and referenced here. Update the list of version
1846 dependencies. This will be put into the .gnu.version_r section.
1847 This function is called via elf_link_hash_traverse. */
1850 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1853 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1854 Elf_Internal_Verneed *t;
1855 Elf_Internal_Vernaux *a;
1858 if (h->root.type == bfd_link_hash_warning)
1859 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1861 /* We only care about symbols defined in shared objects with version
1866 || h->verinfo.verdef == NULL)
1869 /* See if we already know about this version. */
1870 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1874 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1877 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1878 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1884 /* This is a new version. Add it to tree we are building. */
1889 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1892 rinfo->failed = TRUE;
1896 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1897 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1898 elf_tdata (rinfo->info->output_bfd)->verref = t;
1902 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1905 rinfo->failed = TRUE;
1909 /* Note that we are copying a string pointer here, and testing it
1910 above. If bfd_elf_string_from_elf_section is ever changed to
1911 discard the string data when low in memory, this will have to be
1913 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1915 a->vna_flags = h->verinfo.verdef->vd_flags;
1916 a->vna_nextptr = t->vn_auxptr;
1918 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1921 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1928 /* Figure out appropriate versions for all the symbols. We may not
1929 have the version number script until we have read all of the input
1930 files, so until that point we don't know which symbols should be
1931 local. This function is called via elf_link_hash_traverse. */
1934 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1936 struct elf_info_failed *sinfo;
1937 struct bfd_link_info *info;
1938 const struct elf_backend_data *bed;
1939 struct elf_info_failed eif;
1943 sinfo = (struct elf_info_failed *) data;
1946 if (h->root.type == bfd_link_hash_warning)
1947 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1949 /* Fix the symbol flags. */
1952 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1955 sinfo->failed = TRUE;
1959 /* We only need version numbers for symbols defined in regular
1961 if (!h->def_regular)
1964 bed = get_elf_backend_data (info->output_bfd);
1965 p = strchr (h->root.root.string, ELF_VER_CHR);
1966 if (p != NULL && h->verinfo.vertree == NULL)
1968 struct bfd_elf_version_tree *t;
1973 /* There are two consecutive ELF_VER_CHR characters if this is
1974 not a hidden symbol. */
1976 if (*p == ELF_VER_CHR)
1982 /* If there is no version string, we can just return out. */
1990 /* Look for the version. If we find it, it is no longer weak. */
1991 for (t = sinfo->verdefs; t != NULL; t = t->next)
1993 if (strcmp (t->name, p) == 0)
1997 struct bfd_elf_version_expr *d;
1999 len = p - h->root.root.string;
2000 alc = (char *) bfd_malloc (len);
2003 sinfo->failed = TRUE;
2006 memcpy (alc, h->root.root.string, len - 1);
2007 alc[len - 1] = '\0';
2008 if (alc[len - 2] == ELF_VER_CHR)
2009 alc[len - 2] = '\0';
2011 h->verinfo.vertree = t;
2015 if (t->globals.list != NULL)
2016 d = (*t->match) (&t->globals, NULL, alc);
2018 /* See if there is anything to force this symbol to
2020 if (d == NULL && t->locals.list != NULL)
2022 d = (*t->match) (&t->locals, NULL, alc);
2025 && ! info->export_dynamic)
2026 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2034 /* If we are building an application, we need to create a
2035 version node for this version. */
2036 if (t == NULL && info->executable)
2038 struct bfd_elf_version_tree **pp;
2041 /* If we aren't going to export this symbol, we don't need
2042 to worry about it. */
2043 if (h->dynindx == -1)
2047 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2050 sinfo->failed = TRUE;
2055 t->name_indx = (unsigned int) -1;
2059 /* Don't count anonymous version tag. */
2060 if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0)
2062 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
2064 t->vernum = version_index;
2068 h->verinfo.vertree = t;
2072 /* We could not find the version for a symbol when
2073 generating a shared archive. Return an error. */
2074 (*_bfd_error_handler)
2075 (_("%B: version node not found for symbol %s"),
2076 info->output_bfd, h->root.root.string);
2077 bfd_set_error (bfd_error_bad_value);
2078 sinfo->failed = TRUE;
2086 /* If we don't have a version for this symbol, see if we can find
2088 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
2092 h->verinfo.vertree = bfd_find_version_for_sym (sinfo->verdefs,
2093 h->root.root.string, &hide);
2094 if (h->verinfo.vertree != NULL && hide)
2095 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2101 /* Read and swap the relocs from the section indicated by SHDR. This
2102 may be either a REL or a RELA section. The relocations are
2103 translated into RELA relocations and stored in INTERNAL_RELOCS,
2104 which should have already been allocated to contain enough space.
2105 The EXTERNAL_RELOCS are a buffer where the external form of the
2106 relocations should be stored.
2108 Returns FALSE if something goes wrong. */
2111 elf_link_read_relocs_from_section (bfd *abfd,
2113 Elf_Internal_Shdr *shdr,
2114 void *external_relocs,
2115 Elf_Internal_Rela *internal_relocs)
2117 const struct elf_backend_data *bed;
2118 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2119 const bfd_byte *erela;
2120 const bfd_byte *erelaend;
2121 Elf_Internal_Rela *irela;
2122 Elf_Internal_Shdr *symtab_hdr;
2125 /* Position ourselves at the start of the section. */
2126 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2129 /* Read the relocations. */
2130 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2133 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2134 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2136 bed = get_elf_backend_data (abfd);
2138 /* Convert the external relocations to the internal format. */
2139 if (shdr->sh_entsize == bed->s->sizeof_rel)
2140 swap_in = bed->s->swap_reloc_in;
2141 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2142 swap_in = bed->s->swap_reloca_in;
2145 bfd_set_error (bfd_error_wrong_format);
2149 erela = (const bfd_byte *) external_relocs;
2150 erelaend = erela + shdr->sh_size;
2151 irela = internal_relocs;
2152 while (erela < erelaend)
2156 (*swap_in) (abfd, erela, irela);
2157 r_symndx = ELF32_R_SYM (irela->r_info);
2158 if (bed->s->arch_size == 64)
2162 if ((size_t) r_symndx >= nsyms)
2164 (*_bfd_error_handler)
2165 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2166 " for offset 0x%lx in section `%A'"),
2168 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2169 bfd_set_error (bfd_error_bad_value);
2173 else if (r_symndx != 0)
2175 (*_bfd_error_handler)
2176 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2177 " when the object file has no symbol table"),
2179 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2180 bfd_set_error (bfd_error_bad_value);
2183 irela += bed->s->int_rels_per_ext_rel;
2184 erela += shdr->sh_entsize;
2190 /* Read and swap the relocs for a section O. They may have been
2191 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2192 not NULL, they are used as buffers to read into. They are known to
2193 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2194 the return value is allocated using either malloc or bfd_alloc,
2195 according to the KEEP_MEMORY argument. If O has two relocation
2196 sections (both REL and RELA relocations), then the REL_HDR
2197 relocations will appear first in INTERNAL_RELOCS, followed by the
2198 REL_HDR2 relocations. */
2201 _bfd_elf_link_read_relocs (bfd *abfd,
2203 void *external_relocs,
2204 Elf_Internal_Rela *internal_relocs,
2205 bfd_boolean keep_memory)
2207 Elf_Internal_Shdr *rel_hdr;
2208 void *alloc1 = NULL;
2209 Elf_Internal_Rela *alloc2 = NULL;
2210 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2212 if (elf_section_data (o)->relocs != NULL)
2213 return elf_section_data (o)->relocs;
2215 if (o->reloc_count == 0)
2218 rel_hdr = &elf_section_data (o)->rel_hdr;
2220 if (internal_relocs == NULL)
2224 size = o->reloc_count;
2225 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2227 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2229 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2230 if (internal_relocs == NULL)
2234 if (external_relocs == NULL)
2236 bfd_size_type size = rel_hdr->sh_size;
2238 if (elf_section_data (o)->rel_hdr2)
2239 size += elf_section_data (o)->rel_hdr2->sh_size;
2240 alloc1 = bfd_malloc (size);
2243 external_relocs = alloc1;
2246 if (!elf_link_read_relocs_from_section (abfd, o, rel_hdr,
2250 if (elf_section_data (o)->rel_hdr2
2251 && (!elf_link_read_relocs_from_section
2253 elf_section_data (o)->rel_hdr2,
2254 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2255 internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
2256 * bed->s->int_rels_per_ext_rel))))
2259 /* Cache the results for next time, if we can. */
2261 elf_section_data (o)->relocs = internal_relocs;
2266 /* Don't free alloc2, since if it was allocated we are passing it
2267 back (under the name of internal_relocs). */
2269 return internal_relocs;
2277 bfd_release (abfd, alloc2);
2284 /* Compute the size of, and allocate space for, REL_HDR which is the
2285 section header for a section containing relocations for O. */
2288 _bfd_elf_link_size_reloc_section (bfd *abfd,
2289 Elf_Internal_Shdr *rel_hdr,
2292 bfd_size_type reloc_count;
2293 bfd_size_type num_rel_hashes;
2295 /* Figure out how many relocations there will be. */
2296 if (rel_hdr == &elf_section_data (o)->rel_hdr)
2297 reloc_count = elf_section_data (o)->rel_count;
2299 reloc_count = elf_section_data (o)->rel_count2;
2301 num_rel_hashes = o->reloc_count;
2302 if (num_rel_hashes < reloc_count)
2303 num_rel_hashes = reloc_count;
2305 /* That allows us to calculate the size of the section. */
2306 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
2308 /* The contents field must last into write_object_contents, so we
2309 allocate it with bfd_alloc rather than malloc. Also since we
2310 cannot be sure that the contents will actually be filled in,
2311 we zero the allocated space. */
2312 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2313 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2316 /* We only allocate one set of hash entries, so we only do it the
2317 first time we are called. */
2318 if (elf_section_data (o)->rel_hashes == NULL
2321 struct elf_link_hash_entry **p;
2323 p = (struct elf_link_hash_entry **)
2324 bfd_zmalloc (num_rel_hashes * sizeof (struct elf_link_hash_entry *));
2328 elf_section_data (o)->rel_hashes = p;
2334 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2335 originated from the section given by INPUT_REL_HDR) to the
2339 _bfd_elf_link_output_relocs (bfd *output_bfd,
2340 asection *input_section,
2341 Elf_Internal_Shdr *input_rel_hdr,
2342 Elf_Internal_Rela *internal_relocs,
2343 struct elf_link_hash_entry **rel_hash
2346 Elf_Internal_Rela *irela;
2347 Elf_Internal_Rela *irelaend;
2349 Elf_Internal_Shdr *output_rel_hdr;
2350 asection *output_section;
2351 unsigned int *rel_countp = NULL;
2352 const struct elf_backend_data *bed;
2353 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2355 output_section = input_section->output_section;
2356 output_rel_hdr = NULL;
2358 if (elf_section_data (output_section)->rel_hdr.sh_entsize
2359 == input_rel_hdr->sh_entsize)
2361 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
2362 rel_countp = &elf_section_data (output_section)->rel_count;
2364 else if (elf_section_data (output_section)->rel_hdr2
2365 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
2366 == input_rel_hdr->sh_entsize))
2368 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
2369 rel_countp = &elf_section_data (output_section)->rel_count2;
2373 (*_bfd_error_handler)
2374 (_("%B: relocation size mismatch in %B section %A"),
2375 output_bfd, input_section->owner, input_section);
2376 bfd_set_error (bfd_error_wrong_format);
2380 bed = get_elf_backend_data (output_bfd);
2381 if (input_rel_hdr->sh_entsize == bed->s->sizeof_rel)
2382 swap_out = bed->s->swap_reloc_out;
2383 else if (input_rel_hdr->sh_entsize == bed->s->sizeof_rela)
2384 swap_out = bed->s->swap_reloca_out;
2388 erel = output_rel_hdr->contents;
2389 erel += *rel_countp * input_rel_hdr->sh_entsize;
2390 irela = internal_relocs;
2391 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2392 * bed->s->int_rels_per_ext_rel);
2393 while (irela < irelaend)
2395 (*swap_out) (output_bfd, irela, erel);
2396 irela += bed->s->int_rels_per_ext_rel;
2397 erel += input_rel_hdr->sh_entsize;
2400 /* Bump the counter, so that we know where to add the next set of
2402 *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr);
2407 /* Make weak undefined symbols in PIE dynamic. */
2410 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2411 struct elf_link_hash_entry *h)
2415 && h->root.type == bfd_link_hash_undefweak)
2416 return bfd_elf_link_record_dynamic_symbol (info, h);
2421 /* Fix up the flags for a symbol. This handles various cases which
2422 can only be fixed after all the input files are seen. This is
2423 currently called by both adjust_dynamic_symbol and
2424 assign_sym_version, which is unnecessary but perhaps more robust in
2425 the face of future changes. */
2428 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2429 struct elf_info_failed *eif)
2431 const struct elf_backend_data *bed;
2433 /* If this symbol was mentioned in a non-ELF file, try to set
2434 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2435 permit a non-ELF file to correctly refer to a symbol defined in
2436 an ELF dynamic object. */
2439 while (h->root.type == bfd_link_hash_indirect)
2440 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2442 if (h->root.type != bfd_link_hash_defined
2443 && h->root.type != bfd_link_hash_defweak)
2446 h->ref_regular_nonweak = 1;
2450 if (h->root.u.def.section->owner != NULL
2451 && (bfd_get_flavour (h->root.u.def.section->owner)
2452 == bfd_target_elf_flavour))
2455 h->ref_regular_nonweak = 1;
2461 if (h->dynindx == -1
2465 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2474 /* Unfortunately, NON_ELF is only correct if the symbol
2475 was first seen in a non-ELF file. Fortunately, if the symbol
2476 was first seen in an ELF file, we're probably OK unless the
2477 symbol was defined in a non-ELF file. Catch that case here.
2478 FIXME: We're still in trouble if the symbol was first seen in
2479 a dynamic object, and then later in a non-ELF regular object. */
2480 if ((h->root.type == bfd_link_hash_defined
2481 || h->root.type == bfd_link_hash_defweak)
2483 && (h->root.u.def.section->owner != NULL
2484 ? (bfd_get_flavour (h->root.u.def.section->owner)
2485 != bfd_target_elf_flavour)
2486 : (bfd_is_abs_section (h->root.u.def.section)
2487 && !h->def_dynamic)))
2491 /* Backend specific symbol fixup. */
2492 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2493 if (bed->elf_backend_fixup_symbol
2494 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2497 /* If this is a final link, and the symbol was defined as a common
2498 symbol in a regular object file, and there was no definition in
2499 any dynamic object, then the linker will have allocated space for
2500 the symbol in a common section but the DEF_REGULAR
2501 flag will not have been set. */
2502 if (h->root.type == bfd_link_hash_defined
2506 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
2509 /* If -Bsymbolic was used (which means to bind references to global
2510 symbols to the definition within the shared object), and this
2511 symbol was defined in a regular object, then it actually doesn't
2512 need a PLT entry. Likewise, if the symbol has non-default
2513 visibility. If the symbol has hidden or internal visibility, we
2514 will force it local. */
2516 && eif->info->shared
2517 && is_elf_hash_table (eif->info->hash)
2518 && (SYMBOLIC_BIND (eif->info, h)
2519 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2522 bfd_boolean force_local;
2524 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2525 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2526 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2529 /* If a weak undefined symbol has non-default visibility, we also
2530 hide it from the dynamic linker. */
2531 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2532 && h->root.type == bfd_link_hash_undefweak)
2533 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2535 /* If this is a weak defined symbol in a dynamic object, and we know
2536 the real definition in the dynamic object, copy interesting flags
2537 over to the real definition. */
2538 if (h->u.weakdef != NULL)
2540 struct elf_link_hash_entry *weakdef;
2542 weakdef = h->u.weakdef;
2543 if (h->root.type == bfd_link_hash_indirect)
2544 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2546 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2547 || h->root.type == bfd_link_hash_defweak);
2548 BFD_ASSERT (weakdef->def_dynamic);
2550 /* If the real definition is defined by a regular object file,
2551 don't do anything special. See the longer description in
2552 _bfd_elf_adjust_dynamic_symbol, below. */
2553 if (weakdef->def_regular)
2554 h->u.weakdef = NULL;
2557 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2558 || weakdef->root.type == bfd_link_hash_defweak);
2559 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2566 /* Make the backend pick a good value for a dynamic symbol. This is
2567 called via elf_link_hash_traverse, and also calls itself
2571 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2573 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2575 const struct elf_backend_data *bed;
2577 if (! is_elf_hash_table (eif->info->hash))
2580 if (h->root.type == bfd_link_hash_warning)
2582 h->got = elf_hash_table (eif->info)->init_got_offset;
2583 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2585 /* When warning symbols are created, they **replace** the "real"
2586 entry in the hash table, thus we never get to see the real
2587 symbol in a hash traversal. So look at it now. */
2588 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2591 /* Ignore indirect symbols. These are added by the versioning code. */
2592 if (h->root.type == bfd_link_hash_indirect)
2595 /* Fix the symbol flags. */
2596 if (! _bfd_elf_fix_symbol_flags (h, eif))
2599 /* If this symbol does not require a PLT entry, and it is not
2600 defined by a dynamic object, or is not referenced by a regular
2601 object, ignore it. We do have to handle a weak defined symbol,
2602 even if no regular object refers to it, if we decided to add it
2603 to the dynamic symbol table. FIXME: Do we normally need to worry
2604 about symbols which are defined by one dynamic object and
2605 referenced by another one? */
2607 && h->type != STT_GNU_IFUNC
2611 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2613 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2617 /* If we've already adjusted this symbol, don't do it again. This
2618 can happen via a recursive call. */
2619 if (h->dynamic_adjusted)
2622 /* Don't look at this symbol again. Note that we must set this
2623 after checking the above conditions, because we may look at a
2624 symbol once, decide not to do anything, and then get called
2625 recursively later after REF_REGULAR is set below. */
2626 h->dynamic_adjusted = 1;
2628 /* If this is a weak definition, and we know a real definition, and
2629 the real symbol is not itself defined by a regular object file,
2630 then get a good value for the real definition. We handle the
2631 real symbol first, for the convenience of the backend routine.
2633 Note that there is a confusing case here. If the real definition
2634 is defined by a regular object file, we don't get the real symbol
2635 from the dynamic object, but we do get the weak symbol. If the
2636 processor backend uses a COPY reloc, then if some routine in the
2637 dynamic object changes the real symbol, we will not see that
2638 change in the corresponding weak symbol. This is the way other
2639 ELF linkers work as well, and seems to be a result of the shared
2642 I will clarify this issue. Most SVR4 shared libraries define the
2643 variable _timezone and define timezone as a weak synonym. The
2644 tzset call changes _timezone. If you write
2645 extern int timezone;
2647 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2648 you might expect that, since timezone is a synonym for _timezone,
2649 the same number will print both times. However, if the processor
2650 backend uses a COPY reloc, then actually timezone will be copied
2651 into your process image, and, since you define _timezone
2652 yourself, _timezone will not. Thus timezone and _timezone will
2653 wind up at different memory locations. The tzset call will set
2654 _timezone, leaving timezone unchanged. */
2656 if (h->u.weakdef != NULL)
2658 /* If we get to this point, we know there is an implicit
2659 reference by a regular object file via the weak symbol H.
2660 FIXME: Is this really true? What if the traversal finds
2661 H->U.WEAKDEF before it finds H? */
2662 h->u.weakdef->ref_regular = 1;
2664 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2668 /* If a symbol has no type and no size and does not require a PLT
2669 entry, then we are probably about to do the wrong thing here: we
2670 are probably going to create a COPY reloc for an empty object.
2671 This case can arise when a shared object is built with assembly
2672 code, and the assembly code fails to set the symbol type. */
2674 && h->type == STT_NOTYPE
2676 (*_bfd_error_handler)
2677 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2678 h->root.root.string);
2680 dynobj = elf_hash_table (eif->info)->dynobj;
2681 bed = get_elf_backend_data (dynobj);
2683 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2692 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2696 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
2699 unsigned int power_of_two;
2701 asection *sec = h->root.u.def.section;
2703 /* The section aligment of definition is the maximum alignment
2704 requirement of symbols defined in the section. Since we don't
2705 know the symbol alignment requirement, we start with the
2706 maximum alignment and check low bits of the symbol address
2707 for the minimum alignment. */
2708 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2709 mask = ((bfd_vma) 1 << power_of_two) - 1;
2710 while ((h->root.u.def.value & mask) != 0)
2716 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2719 /* Adjust the section alignment if needed. */
2720 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2725 /* We make sure that the symbol will be aligned properly. */
2726 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2728 /* Define the symbol as being at this point in DYNBSS. */
2729 h->root.u.def.section = dynbss;
2730 h->root.u.def.value = dynbss->size;
2732 /* Increment the size of DYNBSS to make room for the symbol. */
2733 dynbss->size += h->size;
2738 /* Adjust all external symbols pointing into SEC_MERGE sections
2739 to reflect the object merging within the sections. */
2742 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2746 if (h->root.type == bfd_link_hash_warning)
2747 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2749 if ((h->root.type == bfd_link_hash_defined
2750 || h->root.type == bfd_link_hash_defweak)
2751 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2752 && sec->sec_info_type == ELF_INFO_TYPE_MERGE)
2754 bfd *output_bfd = (bfd *) data;
2756 h->root.u.def.value =
2757 _bfd_merged_section_offset (output_bfd,
2758 &h->root.u.def.section,
2759 elf_section_data (sec)->sec_info,
2760 h->root.u.def.value);
2766 /* Returns false if the symbol referred to by H should be considered
2767 to resolve local to the current module, and true if it should be
2768 considered to bind dynamically. */
2771 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2772 struct bfd_link_info *info,
2773 bfd_boolean ignore_protected)
2775 bfd_boolean binding_stays_local_p;
2776 const struct elf_backend_data *bed;
2777 struct elf_link_hash_table *hash_table;
2782 while (h->root.type == bfd_link_hash_indirect
2783 || h->root.type == bfd_link_hash_warning)
2784 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2786 /* If it was forced local, then clearly it's not dynamic. */
2787 if (h->dynindx == -1)
2789 if (h->forced_local)
2792 /* Identify the cases where name binding rules say that a
2793 visible symbol resolves locally. */
2794 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2796 switch (ELF_ST_VISIBILITY (h->other))
2803 hash_table = elf_hash_table (info);
2804 if (!is_elf_hash_table (hash_table))
2807 bed = get_elf_backend_data (hash_table->dynobj);
2809 /* Proper resolution for function pointer equality may require
2810 that these symbols perhaps be resolved dynamically, even though
2811 we should be resolving them to the current module. */
2812 if (!ignore_protected || !bed->is_function_type (h->type))
2813 binding_stays_local_p = TRUE;
2820 /* If it isn't defined locally, then clearly it's dynamic. */
2821 if (!h->def_regular)
2824 /* Otherwise, the symbol is dynamic if binding rules don't tell
2825 us that it remains local. */
2826 return !binding_stays_local_p;
2829 /* Return true if the symbol referred to by H should be considered
2830 to resolve local to the current module, and false otherwise. Differs
2831 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2832 undefined symbols and weak symbols. */
2835 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2836 struct bfd_link_info *info,
2837 bfd_boolean local_protected)
2839 const struct elf_backend_data *bed;
2840 struct elf_link_hash_table *hash_table;
2842 /* If it's a local sym, of course we resolve locally. */
2846 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2847 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2848 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2851 /* Common symbols that become definitions don't get the DEF_REGULAR
2852 flag set, so test it first, and don't bail out. */
2853 if (ELF_COMMON_DEF_P (h))
2855 /* If we don't have a definition in a regular file, then we can't
2856 resolve locally. The sym is either undefined or dynamic. */
2857 else if (!h->def_regular)
2860 /* Forced local symbols resolve locally. */
2861 if (h->forced_local)
2864 /* As do non-dynamic symbols. */
2865 if (h->dynindx == -1)
2868 /* At this point, we know the symbol is defined and dynamic. In an
2869 executable it must resolve locally, likewise when building symbolic
2870 shared libraries. */
2871 if (info->executable || SYMBOLIC_BIND (info, h))
2874 /* Now deal with defined dynamic symbols in shared libraries. Ones
2875 with default visibility might not resolve locally. */
2876 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2879 hash_table = elf_hash_table (info);
2880 if (!is_elf_hash_table (hash_table))
2883 bed = get_elf_backend_data (hash_table->dynobj);
2885 /* STV_PROTECTED non-function symbols are local. */
2886 if (!bed->is_function_type (h->type))
2889 /* Function pointer equality tests may require that STV_PROTECTED
2890 symbols be treated as dynamic symbols, even when we know that the
2891 dynamic linker will resolve them locally. */
2892 return local_protected;
2895 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2896 aligned. Returns the first TLS output section. */
2898 struct bfd_section *
2899 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2901 struct bfd_section *sec, *tls;
2902 unsigned int align = 0;
2904 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2905 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2909 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2910 if (sec->alignment_power > align)
2911 align = sec->alignment_power;
2913 elf_hash_table (info)->tls_sec = tls;
2915 /* Ensure the alignment of the first section is the largest alignment,
2916 so that the tls segment starts aligned. */
2918 tls->alignment_power = align;
2923 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2925 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2926 Elf_Internal_Sym *sym)
2928 const struct elf_backend_data *bed;
2930 /* Local symbols do not count, but target specific ones might. */
2931 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2932 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2935 bed = get_elf_backend_data (abfd);
2936 /* Function symbols do not count. */
2937 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2940 /* If the section is undefined, then so is the symbol. */
2941 if (sym->st_shndx == SHN_UNDEF)
2944 /* If the symbol is defined in the common section, then
2945 it is a common definition and so does not count. */
2946 if (bed->common_definition (sym))
2949 /* If the symbol is in a target specific section then we
2950 must rely upon the backend to tell us what it is. */
2951 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2952 /* FIXME - this function is not coded yet:
2954 return _bfd_is_global_symbol_definition (abfd, sym);
2956 Instead for now assume that the definition is not global,
2957 Even if this is wrong, at least the linker will behave
2958 in the same way that it used to do. */
2964 /* Search the symbol table of the archive element of the archive ABFD
2965 whose archive map contains a mention of SYMDEF, and determine if
2966 the symbol is defined in this element. */
2968 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2970 Elf_Internal_Shdr * hdr;
2971 bfd_size_type symcount;
2972 bfd_size_type extsymcount;
2973 bfd_size_type extsymoff;
2974 Elf_Internal_Sym *isymbuf;
2975 Elf_Internal_Sym *isym;
2976 Elf_Internal_Sym *isymend;
2979 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2983 if (! bfd_check_format (abfd, bfd_object))
2986 /* If we have already included the element containing this symbol in the
2987 link then we do not need to include it again. Just claim that any symbol
2988 it contains is not a definition, so that our caller will not decide to
2989 (re)include this element. */
2990 if (abfd->archive_pass)
2993 /* Select the appropriate symbol table. */
2994 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2995 hdr = &elf_tdata (abfd)->symtab_hdr;
2997 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2999 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
3001 /* The sh_info field of the symtab header tells us where the
3002 external symbols start. We don't care about the local symbols. */
3003 if (elf_bad_symtab (abfd))
3005 extsymcount = symcount;
3010 extsymcount = symcount - hdr->sh_info;
3011 extsymoff = hdr->sh_info;
3014 if (extsymcount == 0)
3017 /* Read in the symbol table. */
3018 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3020 if (isymbuf == NULL)
3023 /* Scan the symbol table looking for SYMDEF. */
3025 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
3029 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3034 if (strcmp (name, symdef->name) == 0)
3036 result = is_global_data_symbol_definition (abfd, isym);
3046 /* Add an entry to the .dynamic table. */
3049 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3053 struct elf_link_hash_table *hash_table;
3054 const struct elf_backend_data *bed;
3056 bfd_size_type newsize;
3057 bfd_byte *newcontents;
3058 Elf_Internal_Dyn dyn;
3060 hash_table = elf_hash_table (info);
3061 if (! is_elf_hash_table (hash_table))
3064 bed = get_elf_backend_data (hash_table->dynobj);
3065 s = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
3066 BFD_ASSERT (s != NULL);
3068 newsize = s->size + bed->s->sizeof_dyn;
3069 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3070 if (newcontents == NULL)
3074 dyn.d_un.d_val = val;
3075 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3078 s->contents = newcontents;
3083 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3084 otherwise just check whether one already exists. Returns -1 on error,
3085 1 if a DT_NEEDED tag already exists, and 0 on success. */
3088 elf_add_dt_needed_tag (bfd *abfd,
3089 struct bfd_link_info *info,
3093 struct elf_link_hash_table *hash_table;
3094 bfd_size_type oldsize;
3095 bfd_size_type strindex;
3097 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3100 hash_table = elf_hash_table (info);
3101 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
3102 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3103 if (strindex == (bfd_size_type) -1)
3106 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
3109 const struct elf_backend_data *bed;
3112 bed = get_elf_backend_data (hash_table->dynobj);
3113 sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
3115 for (extdyn = sdyn->contents;
3116 extdyn < sdyn->contents + sdyn->size;
3117 extdyn += bed->s->sizeof_dyn)
3119 Elf_Internal_Dyn dyn;
3121 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3122 if (dyn.d_tag == DT_NEEDED
3123 && dyn.d_un.d_val == strindex)
3125 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3133 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3136 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3140 /* We were just checking for existence of the tag. */
3141 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3147 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3149 for (; needed != NULL; needed = needed->next)
3150 if (strcmp (soname, needed->name) == 0)
3156 /* Sort symbol by value and section. */
3158 elf_sort_symbol (const void *arg1, const void *arg2)
3160 const struct elf_link_hash_entry *h1;
3161 const struct elf_link_hash_entry *h2;
3162 bfd_signed_vma vdiff;
3164 h1 = *(const struct elf_link_hash_entry **) arg1;
3165 h2 = *(const struct elf_link_hash_entry **) arg2;
3166 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3168 return vdiff > 0 ? 1 : -1;
3171 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3173 return sdiff > 0 ? 1 : -1;
3178 /* This function is used to adjust offsets into .dynstr for
3179 dynamic symbols. This is called via elf_link_hash_traverse. */
3182 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3184 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3186 if (h->root.type == bfd_link_hash_warning)
3187 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3189 if (h->dynindx != -1)
3190 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3194 /* Assign string offsets in .dynstr, update all structures referencing
3198 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3200 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3201 struct elf_link_local_dynamic_entry *entry;
3202 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3203 bfd *dynobj = hash_table->dynobj;
3206 const struct elf_backend_data *bed;
3209 _bfd_elf_strtab_finalize (dynstr);
3210 size = _bfd_elf_strtab_size (dynstr);
3212 bed = get_elf_backend_data (dynobj);
3213 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3214 BFD_ASSERT (sdyn != NULL);
3216 /* Update all .dynamic entries referencing .dynstr strings. */
3217 for (extdyn = sdyn->contents;
3218 extdyn < sdyn->contents + sdyn->size;
3219 extdyn += bed->s->sizeof_dyn)
3221 Elf_Internal_Dyn dyn;
3223 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3227 dyn.d_un.d_val = size;
3237 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3242 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3245 /* Now update local dynamic symbols. */
3246 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3247 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3248 entry->isym.st_name);
3250 /* And the rest of dynamic symbols. */
3251 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3253 /* Adjust version definitions. */
3254 if (elf_tdata (output_bfd)->cverdefs)
3259 Elf_Internal_Verdef def;
3260 Elf_Internal_Verdaux defaux;
3262 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3266 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3268 p += sizeof (Elf_External_Verdef);
3269 if (def.vd_aux != sizeof (Elf_External_Verdef))
3271 for (i = 0; i < def.vd_cnt; ++i)
3273 _bfd_elf_swap_verdaux_in (output_bfd,
3274 (Elf_External_Verdaux *) p, &defaux);
3275 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3277 _bfd_elf_swap_verdaux_out (output_bfd,
3278 &defaux, (Elf_External_Verdaux *) p);
3279 p += sizeof (Elf_External_Verdaux);
3282 while (def.vd_next);
3285 /* Adjust version references. */
3286 if (elf_tdata (output_bfd)->verref)
3291 Elf_Internal_Verneed need;
3292 Elf_Internal_Vernaux needaux;
3294 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3298 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3300 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3301 _bfd_elf_swap_verneed_out (output_bfd, &need,
3302 (Elf_External_Verneed *) p);
3303 p += sizeof (Elf_External_Verneed);
3304 for (i = 0; i < need.vn_cnt; ++i)
3306 _bfd_elf_swap_vernaux_in (output_bfd,
3307 (Elf_External_Vernaux *) p, &needaux);
3308 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3310 _bfd_elf_swap_vernaux_out (output_bfd,
3312 (Elf_External_Vernaux *) p);
3313 p += sizeof (Elf_External_Vernaux);
3316 while (need.vn_next);
3322 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3323 The default is to only match when the INPUT and OUTPUT are exactly
3327 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3328 const bfd_target *output)
3330 return input == output;
3333 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3334 This version is used when different targets for the same architecture
3335 are virtually identical. */
3338 _bfd_elf_relocs_compatible (const bfd_target *input,
3339 const bfd_target *output)
3341 const struct elf_backend_data *obed, *ibed;
3343 if (input == output)
3346 ibed = xvec_get_elf_backend_data (input);
3347 obed = xvec_get_elf_backend_data (output);
3349 if (ibed->arch != obed->arch)
3352 /* If both backends are using this function, deem them compatible. */
3353 return ibed->relocs_compatible == obed->relocs_compatible;
3356 /* Add symbols from an ELF object file to the linker hash table. */
3359 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3361 Elf_Internal_Ehdr *ehdr;
3362 Elf_Internal_Shdr *hdr;
3363 bfd_size_type symcount;
3364 bfd_size_type extsymcount;
3365 bfd_size_type extsymoff;
3366 struct elf_link_hash_entry **sym_hash;
3367 bfd_boolean dynamic;
3368 Elf_External_Versym *extversym = NULL;
3369 Elf_External_Versym *ever;
3370 struct elf_link_hash_entry *weaks;
3371 struct elf_link_hash_entry **nondeflt_vers = NULL;
3372 bfd_size_type nondeflt_vers_cnt = 0;
3373 Elf_Internal_Sym *isymbuf = NULL;
3374 Elf_Internal_Sym *isym;
3375 Elf_Internal_Sym *isymend;
3376 const struct elf_backend_data *bed;
3377 bfd_boolean add_needed;
3378 struct elf_link_hash_table *htab;
3380 void *alloc_mark = NULL;
3381 struct bfd_hash_entry **old_table = NULL;
3382 unsigned int old_size = 0;
3383 unsigned int old_count = 0;
3384 void *old_tab = NULL;
3387 struct bfd_link_hash_entry *old_undefs = NULL;
3388 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3389 long old_dynsymcount = 0;
3391 size_t hashsize = 0;
3393 htab = elf_hash_table (info);
3394 bed = get_elf_backend_data (abfd);
3396 if ((abfd->flags & DYNAMIC) == 0)
3402 /* You can't use -r against a dynamic object. Also, there's no
3403 hope of using a dynamic object which does not exactly match
3404 the format of the output file. */
3405 if (info->relocatable
3406 || !is_elf_hash_table (htab)
3407 || info->output_bfd->xvec != abfd->xvec)
3409 if (info->relocatable)
3410 bfd_set_error (bfd_error_invalid_operation);
3412 bfd_set_error (bfd_error_wrong_format);
3417 ehdr = elf_elfheader (abfd);
3418 if (info->warn_alternate_em
3419 && bed->elf_machine_code != ehdr->e_machine
3420 && ((bed->elf_machine_alt1 != 0
3421 && ehdr->e_machine == bed->elf_machine_alt1)
3422 || (bed->elf_machine_alt2 != 0
3423 && ehdr->e_machine == bed->elf_machine_alt2)))
3424 info->callbacks->einfo
3425 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3426 ehdr->e_machine, abfd, bed->elf_machine_code);
3428 /* As a GNU extension, any input sections which are named
3429 .gnu.warning.SYMBOL are treated as warning symbols for the given
3430 symbol. This differs from .gnu.warning sections, which generate
3431 warnings when they are included in an output file. */
3432 if (info->executable)
3436 for (s = abfd->sections; s != NULL; s = s->next)
3440 name = bfd_get_section_name (abfd, s);
3441 if (CONST_STRNEQ (name, ".gnu.warning."))
3446 name += sizeof ".gnu.warning." - 1;
3448 /* If this is a shared object, then look up the symbol
3449 in the hash table. If it is there, and it is already
3450 been defined, then we will not be using the entry
3451 from this shared object, so we don't need to warn.
3452 FIXME: If we see the definition in a regular object
3453 later on, we will warn, but we shouldn't. The only
3454 fix is to keep track of what warnings we are supposed
3455 to emit, and then handle them all at the end of the
3459 struct elf_link_hash_entry *h;
3461 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3463 /* FIXME: What about bfd_link_hash_common? */
3465 && (h->root.type == bfd_link_hash_defined
3466 || h->root.type == bfd_link_hash_defweak))
3468 /* We don't want to issue this warning. Clobber
3469 the section size so that the warning does not
3470 get copied into the output file. */
3477 msg = (char *) bfd_alloc (abfd, sz + 1);
3481 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3486 if (! (_bfd_generic_link_add_one_symbol
3487 (info, abfd, name, BSF_WARNING, s, 0, msg,
3488 FALSE, bed->collect, NULL)))
3491 if (! info->relocatable)
3493 /* Clobber the section size so that the warning does
3494 not get copied into the output file. */
3497 /* Also set SEC_EXCLUDE, so that symbols defined in
3498 the warning section don't get copied to the output. */
3499 s->flags |= SEC_EXCLUDE;
3508 /* If we are creating a shared library, create all the dynamic
3509 sections immediately. We need to attach them to something,
3510 so we attach them to this BFD, provided it is the right
3511 format. FIXME: If there are no input BFD's of the same
3512 format as the output, we can't make a shared library. */
3514 && is_elf_hash_table (htab)
3515 && info->output_bfd->xvec == abfd->xvec
3516 && !htab->dynamic_sections_created)
3518 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3522 else if (!is_elf_hash_table (htab))
3527 const char *soname = NULL;
3529 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3532 /* ld --just-symbols and dynamic objects don't mix very well.
3533 ld shouldn't allow it. */
3534 if ((s = abfd->sections) != NULL
3535 && s->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
3538 /* If this dynamic lib was specified on the command line with
3539 --as-needed in effect, then we don't want to add a DT_NEEDED
3540 tag unless the lib is actually used. Similary for libs brought
3541 in by another lib's DT_NEEDED. When --no-add-needed is used
3542 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3543 any dynamic library in DT_NEEDED tags in the dynamic lib at
3545 add_needed = (elf_dyn_lib_class (abfd)
3546 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3547 | DYN_NO_NEEDED)) == 0;
3549 s = bfd_get_section_by_name (abfd, ".dynamic");
3554 unsigned int elfsec;
3555 unsigned long shlink;
3557 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3564 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3565 if (elfsec == SHN_BAD)
3566 goto error_free_dyn;
3567 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3569 for (extdyn = dynbuf;
3570 extdyn < dynbuf + s->size;
3571 extdyn += bed->s->sizeof_dyn)
3573 Elf_Internal_Dyn dyn;
3575 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3576 if (dyn.d_tag == DT_SONAME)
3578 unsigned int tagv = dyn.d_un.d_val;
3579 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3581 goto error_free_dyn;
3583 if (dyn.d_tag == DT_NEEDED)
3585 struct bfd_link_needed_list *n, **pn;
3587 unsigned int tagv = dyn.d_un.d_val;
3589 amt = sizeof (struct bfd_link_needed_list);
3590 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3591 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3592 if (n == NULL || fnm == NULL)
3593 goto error_free_dyn;
3594 amt = strlen (fnm) + 1;
3595 anm = (char *) bfd_alloc (abfd, amt);
3597 goto error_free_dyn;
3598 memcpy (anm, fnm, amt);
3602 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3606 if (dyn.d_tag == DT_RUNPATH)
3608 struct bfd_link_needed_list *n, **pn;
3610 unsigned int tagv = dyn.d_un.d_val;
3612 amt = sizeof (struct bfd_link_needed_list);
3613 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3614 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3615 if (n == NULL || fnm == NULL)
3616 goto error_free_dyn;
3617 amt = strlen (fnm) + 1;
3618 anm = (char *) bfd_alloc (abfd, amt);
3620 goto error_free_dyn;
3621 memcpy (anm, fnm, amt);
3625 for (pn = & runpath;
3631 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3632 if (!runpath && dyn.d_tag == DT_RPATH)
3634 struct bfd_link_needed_list *n, **pn;
3636 unsigned int tagv = dyn.d_un.d_val;
3638 amt = sizeof (struct bfd_link_needed_list);
3639 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3640 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3641 if (n == NULL || fnm == NULL)
3642 goto error_free_dyn;
3643 amt = strlen (fnm) + 1;
3644 anm = (char *) bfd_alloc (abfd, amt);
3646 goto error_free_dyn;
3647 memcpy (anm, fnm, amt);
3657 if (dyn.d_tag == DT_AUDIT)
3659 unsigned int tagv = dyn.d_un.d_val;
3660 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3667 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3668 frees all more recently bfd_alloc'd blocks as well. */
3674 struct bfd_link_needed_list **pn;
3675 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3680 /* We do not want to include any of the sections in a dynamic
3681 object in the output file. We hack by simply clobbering the
3682 list of sections in the BFD. This could be handled more
3683 cleanly by, say, a new section flag; the existing
3684 SEC_NEVER_LOAD flag is not the one we want, because that one
3685 still implies that the section takes up space in the output
3687 bfd_section_list_clear (abfd);
3689 /* Find the name to use in a DT_NEEDED entry that refers to this
3690 object. If the object has a DT_SONAME entry, we use it.
3691 Otherwise, if the generic linker stuck something in
3692 elf_dt_name, we use that. Otherwise, we just use the file
3694 if (soname == NULL || *soname == '\0')
3696 soname = elf_dt_name (abfd);
3697 if (soname == NULL || *soname == '\0')
3698 soname = bfd_get_filename (abfd);
3701 /* Save the SONAME because sometimes the linker emulation code
3702 will need to know it. */
3703 elf_dt_name (abfd) = soname;
3705 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3709 /* If we have already included this dynamic object in the
3710 link, just ignore it. There is no reason to include a
3711 particular dynamic object more than once. */
3715 /* Save the DT_AUDIT entry for the linker emulation code. */
3716 elf_dt_audit (abfd) = audit;
3719 /* If this is a dynamic object, we always link against the .dynsym
3720 symbol table, not the .symtab symbol table. The dynamic linker
3721 will only see the .dynsym symbol table, so there is no reason to
3722 look at .symtab for a dynamic object. */
3724 if (! dynamic || elf_dynsymtab (abfd) == 0)
3725 hdr = &elf_tdata (abfd)->symtab_hdr;
3727 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3729 symcount = hdr->sh_size / bed->s->sizeof_sym;
3731 /* The sh_info field of the symtab header tells us where the
3732 external symbols start. We don't care about the local symbols at
3734 if (elf_bad_symtab (abfd))
3736 extsymcount = symcount;
3741 extsymcount = symcount - hdr->sh_info;
3742 extsymoff = hdr->sh_info;
3746 if (extsymcount != 0)
3748 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3750 if (isymbuf == NULL)
3753 /* We store a pointer to the hash table entry for each external
3755 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3756 sym_hash = (struct elf_link_hash_entry **) bfd_alloc (abfd, amt);
3757 if (sym_hash == NULL)
3758 goto error_free_sym;
3759 elf_sym_hashes (abfd) = sym_hash;
3764 /* Read in any version definitions. */
3765 if (!_bfd_elf_slurp_version_tables (abfd,
3766 info->default_imported_symver))
3767 goto error_free_sym;
3769 /* Read in the symbol versions, but don't bother to convert them
3770 to internal format. */
3771 if (elf_dynversym (abfd) != 0)
3773 Elf_Internal_Shdr *versymhdr;
3775 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3776 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3777 if (extversym == NULL)
3778 goto error_free_sym;
3779 amt = versymhdr->sh_size;
3780 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3781 || bfd_bread (extversym, amt, abfd) != amt)
3782 goto error_free_vers;
3786 /* If we are loading an as-needed shared lib, save the symbol table
3787 state before we start adding symbols. If the lib turns out
3788 to be unneeded, restore the state. */
3789 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3794 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3796 struct bfd_hash_entry *p;
3797 struct elf_link_hash_entry *h;
3799 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3801 h = (struct elf_link_hash_entry *) p;
3802 entsize += htab->root.table.entsize;
3803 if (h->root.type == bfd_link_hash_warning)
3804 entsize += htab->root.table.entsize;
3808 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3809 hashsize = extsymcount * sizeof (struct elf_link_hash_entry *);
3810 old_tab = bfd_malloc (tabsize + entsize + hashsize);
3811 if (old_tab == NULL)
3812 goto error_free_vers;
3814 /* Remember the current objalloc pointer, so that all mem for
3815 symbols added can later be reclaimed. */
3816 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3817 if (alloc_mark == NULL)
3818 goto error_free_vers;
3820 /* Make a special call to the linker "notice" function to
3821 tell it that we are about to handle an as-needed lib. */
3822 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
3824 goto error_free_vers;
3826 /* Clone the symbol table and sym hashes. Remember some
3827 pointers into the symbol table, and dynamic symbol count. */
3828 old_hash = (char *) old_tab + tabsize;
3829 old_ent = (char *) old_hash + hashsize;
3830 memcpy (old_tab, htab->root.table.table, tabsize);
3831 memcpy (old_hash, sym_hash, hashsize);
3832 old_undefs = htab->root.undefs;
3833 old_undefs_tail = htab->root.undefs_tail;
3834 old_table = htab->root.table.table;
3835 old_size = htab->root.table.size;
3836 old_count = htab->root.table.count;
3837 old_dynsymcount = htab->dynsymcount;
3839 for (i = 0; i < htab->root.table.size; i++)
3841 struct bfd_hash_entry *p;
3842 struct elf_link_hash_entry *h;
3844 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3846 memcpy (old_ent, p, htab->root.table.entsize);
3847 old_ent = (char *) old_ent + htab->root.table.entsize;
3848 h = (struct elf_link_hash_entry *) p;
3849 if (h->root.type == bfd_link_hash_warning)
3851 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3852 old_ent = (char *) old_ent + htab->root.table.entsize;
3859 ever = extversym != NULL ? extversym + extsymoff : NULL;
3860 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3862 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3866 asection *sec, *new_sec;
3869 struct elf_link_hash_entry *h;
3870 bfd_boolean definition;
3871 bfd_boolean size_change_ok;
3872 bfd_boolean type_change_ok;
3873 bfd_boolean new_weakdef;
3874 bfd_boolean override;
3876 unsigned int old_alignment;
3878 bfd * undef_bfd = NULL;
3882 flags = BSF_NO_FLAGS;
3884 value = isym->st_value;
3886 common = bed->common_definition (isym);
3888 bind = ELF_ST_BIND (isym->st_info);
3892 /* This should be impossible, since ELF requires that all
3893 global symbols follow all local symbols, and that sh_info
3894 point to the first global symbol. Unfortunately, Irix 5
3899 if (isym->st_shndx != SHN_UNDEF && !common)
3907 case STB_GNU_UNIQUE:
3908 flags = BSF_GNU_UNIQUE;
3912 /* Leave it up to the processor backend. */
3916 if (isym->st_shndx == SHN_UNDEF)
3917 sec = bfd_und_section_ptr;
3918 else if (isym->st_shndx == SHN_ABS)
3919 sec = bfd_abs_section_ptr;
3920 else if (isym->st_shndx == SHN_COMMON)
3922 sec = bfd_com_section_ptr;
3923 /* What ELF calls the size we call the value. What ELF
3924 calls the value we call the alignment. */
3925 value = isym->st_size;
3929 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3931 sec = bfd_abs_section_ptr;
3932 else if (sec->kept_section)
3934 /* Symbols from discarded section are undefined. We keep
3936 sec = bfd_und_section_ptr;
3937 isym->st_shndx = SHN_UNDEF;
3939 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3943 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3946 goto error_free_vers;
3948 if (isym->st_shndx == SHN_COMMON
3949 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3950 && !info->relocatable)
3952 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3956 tcomm = bfd_make_section_with_flags (abfd, ".tcommon",
3959 | SEC_LINKER_CREATED
3960 | SEC_THREAD_LOCAL));
3962 goto error_free_vers;
3966 else if (bed->elf_add_symbol_hook)
3968 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3970 goto error_free_vers;
3972 /* The hook function sets the name to NULL if this symbol
3973 should be skipped for some reason. */
3978 /* Sanity check that all possibilities were handled. */
3981 bfd_set_error (bfd_error_bad_value);
3982 goto error_free_vers;
3985 if (bfd_is_und_section (sec)
3986 || bfd_is_com_section (sec))
3991 size_change_ok = FALSE;
3992 type_change_ok = bed->type_change_ok;
3997 if (is_elf_hash_table (htab))
3999 Elf_Internal_Versym iver;
4000 unsigned int vernum = 0;
4003 /* If this is a definition of a symbol which was previously
4004 referenced in a non-weak manner then make a note of the bfd
4005 that contained the reference. This is used if we need to
4006 refer to the source of the reference later on. */
4007 if (! bfd_is_und_section (sec))
4009 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
4012 && h->root.type == bfd_link_hash_undefined
4013 && h->root.u.undef.abfd)
4014 undef_bfd = h->root.u.undef.abfd;
4019 if (info->default_imported_symver)
4020 /* Use the default symbol version created earlier. */
4021 iver.vs_vers = elf_tdata (abfd)->cverdefs;
4026 _bfd_elf_swap_versym_in (abfd, ever, &iver);
4028 vernum = iver.vs_vers & VERSYM_VERSION;
4030 /* If this is a hidden symbol, or if it is not version
4031 1, we append the version name to the symbol name.
4032 However, we do not modify a non-hidden absolute symbol
4033 if it is not a function, because it might be the version
4034 symbol itself. FIXME: What if it isn't? */
4035 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4037 && (!bfd_is_abs_section (sec)
4038 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4041 size_t namelen, verlen, newlen;
4044 if (isym->st_shndx != SHN_UNDEF)
4046 if (vernum > elf_tdata (abfd)->cverdefs)
4048 else if (vernum > 1)
4050 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4056 (*_bfd_error_handler)
4057 (_("%B: %s: invalid version %u (max %d)"),
4059 elf_tdata (abfd)->cverdefs);
4060 bfd_set_error (bfd_error_bad_value);
4061 goto error_free_vers;
4066 /* We cannot simply test for the number of
4067 entries in the VERNEED section since the
4068 numbers for the needed versions do not start
4070 Elf_Internal_Verneed *t;
4073 for (t = elf_tdata (abfd)->verref;
4077 Elf_Internal_Vernaux *a;
4079 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4081 if (a->vna_other == vernum)
4083 verstr = a->vna_nodename;
4092 (*_bfd_error_handler)
4093 (_("%B: %s: invalid needed version %d"),
4094 abfd, name, vernum);
4095 bfd_set_error (bfd_error_bad_value);
4096 goto error_free_vers;
4100 namelen = strlen (name);
4101 verlen = strlen (verstr);
4102 newlen = namelen + verlen + 2;
4103 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4104 && isym->st_shndx != SHN_UNDEF)
4107 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4108 if (newname == NULL)
4109 goto error_free_vers;
4110 memcpy (newname, name, namelen);
4111 p = newname + namelen;
4113 /* If this is a defined non-hidden version symbol,
4114 we add another @ to the name. This indicates the
4115 default version of the symbol. */
4116 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4117 && isym->st_shndx != SHN_UNDEF)
4119 memcpy (p, verstr, verlen + 1);
4124 /* If necessary, make a second attempt to locate the bfd
4125 containing an unresolved, non-weak reference to the
4127 if (! bfd_is_und_section (sec) && undef_bfd == NULL)
4129 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
4132 && h->root.type == bfd_link_hash_undefined
4133 && h->root.u.undef.abfd)
4134 undef_bfd = h->root.u.undef.abfd;
4137 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec,
4138 &value, &old_alignment,
4139 sym_hash, &skip, &override,
4140 &type_change_ok, &size_change_ok))
4141 goto error_free_vers;
4150 while (h->root.type == bfd_link_hash_indirect
4151 || h->root.type == bfd_link_hash_warning)
4152 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4154 /* Remember the old alignment if this is a common symbol, so
4155 that we don't reduce the alignment later on. We can't
4156 check later, because _bfd_generic_link_add_one_symbol
4157 will set a default for the alignment which we want to
4158 override. We also remember the old bfd where the existing
4159 definition comes from. */
4160 switch (h->root.type)
4165 case bfd_link_hash_defined:
4166 case bfd_link_hash_defweak:
4167 old_bfd = h->root.u.def.section->owner;
4170 case bfd_link_hash_common:
4171 old_bfd = h->root.u.c.p->section->owner;
4172 old_alignment = h->root.u.c.p->alignment_power;
4176 if (elf_tdata (abfd)->verdef != NULL
4180 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4183 if (! (_bfd_generic_link_add_one_symbol
4184 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4185 (struct bfd_link_hash_entry **) sym_hash)))
4186 goto error_free_vers;
4189 while (h->root.type == bfd_link_hash_indirect
4190 || h->root.type == bfd_link_hash_warning)
4191 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4194 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4196 new_weakdef = FALSE;
4199 && (flags & BSF_WEAK) != 0
4200 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4201 && is_elf_hash_table (htab)
4202 && h->u.weakdef == NULL)
4204 /* Keep a list of all weak defined non function symbols from
4205 a dynamic object, using the weakdef field. Later in this
4206 function we will set the weakdef field to the correct
4207 value. We only put non-function symbols from dynamic
4208 objects on this list, because that happens to be the only
4209 time we need to know the normal symbol corresponding to a
4210 weak symbol, and the information is time consuming to
4211 figure out. If the weakdef field is not already NULL,
4212 then this symbol was already defined by some previous
4213 dynamic object, and we will be using that previous
4214 definition anyhow. */
4216 h->u.weakdef = weaks;
4221 /* Set the alignment of a common symbol. */
4222 if ((common || bfd_is_com_section (sec))
4223 && h->root.type == bfd_link_hash_common)
4228 align = bfd_log2 (isym->st_value);
4231 /* The new symbol is a common symbol in a shared object.
4232 We need to get the alignment from the section. */
4233 align = new_sec->alignment_power;
4235 if (align > old_alignment
4236 /* Permit an alignment power of zero if an alignment of one
4237 is specified and no other alignments have been specified. */
4238 || (isym->st_value == 1 && old_alignment == 0))
4239 h->root.u.c.p->alignment_power = align;
4241 h->root.u.c.p->alignment_power = old_alignment;
4244 if (is_elf_hash_table (htab))
4248 /* Check the alignment when a common symbol is involved. This
4249 can change when a common symbol is overridden by a normal
4250 definition or a common symbol is ignored due to the old
4251 normal definition. We need to make sure the maximum
4252 alignment is maintained. */
4253 if ((old_alignment || common)
4254 && h->root.type != bfd_link_hash_common)
4256 unsigned int common_align;
4257 unsigned int normal_align;
4258 unsigned int symbol_align;
4262 symbol_align = ffs (h->root.u.def.value) - 1;
4263 if (h->root.u.def.section->owner != NULL
4264 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4266 normal_align = h->root.u.def.section->alignment_power;
4267 if (normal_align > symbol_align)
4268 normal_align = symbol_align;
4271 normal_align = symbol_align;
4275 common_align = old_alignment;
4276 common_bfd = old_bfd;
4281 common_align = bfd_log2 (isym->st_value);
4283 normal_bfd = old_bfd;
4286 if (normal_align < common_align)
4288 /* PR binutils/2735 */
4289 if (normal_bfd == NULL)
4290 (*_bfd_error_handler)
4291 (_("Warning: alignment %u of common symbol `%s' in %B"
4292 " is greater than the alignment (%u) of its section %A"),
4293 common_bfd, h->root.u.def.section,
4294 1 << common_align, name, 1 << normal_align);
4296 (*_bfd_error_handler)
4297 (_("Warning: alignment %u of symbol `%s' in %B"
4298 " is smaller than %u in %B"),
4299 normal_bfd, common_bfd,
4300 1 << normal_align, name, 1 << common_align);
4304 /* Remember the symbol size if it isn't undefined. */
4305 if ((isym->st_size != 0 && isym->st_shndx != SHN_UNDEF)
4306 && (definition || h->size == 0))
4309 && h->size != isym->st_size
4310 && ! size_change_ok)
4311 (*_bfd_error_handler)
4312 (_("Warning: size of symbol `%s' changed"
4313 " from %lu in %B to %lu in %B"),
4315 name, (unsigned long) h->size,
4316 (unsigned long) isym->st_size);
4318 h->size = isym->st_size;
4321 /* If this is a common symbol, then we always want H->SIZE
4322 to be the size of the common symbol. The code just above
4323 won't fix the size if a common symbol becomes larger. We
4324 don't warn about a size change here, because that is
4325 covered by --warn-common. Allow changed between different
4327 if (h->root.type == bfd_link_hash_common)
4328 h->size = h->root.u.c.size;
4330 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4331 && (definition || h->type == STT_NOTYPE))
4333 unsigned int type = ELF_ST_TYPE (isym->st_info);
4335 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4337 if (type == STT_GNU_IFUNC
4338 && (abfd->flags & DYNAMIC) != 0)
4341 if (h->type != type)
4343 if (h->type != STT_NOTYPE && ! type_change_ok)
4344 (*_bfd_error_handler)
4345 (_("Warning: type of symbol `%s' changed"
4346 " from %d to %d in %B"),
4347 abfd, name, h->type, type);
4353 /* Merge st_other field. */
4354 elf_merge_st_other (abfd, h, isym, definition, dynamic);
4356 /* Set a flag in the hash table entry indicating the type of
4357 reference or definition we just found. Keep a count of
4358 the number of dynamic symbols we find. A dynamic symbol
4359 is one which is referenced or defined by both a regular
4360 object and a shared object. */
4367 if (bind != STB_WEAK)
4368 h->ref_regular_nonweak = 1;
4380 if (! info->executable
4393 || (h->u.weakdef != NULL
4395 && h->u.weakdef->dynindx != -1))
4399 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4401 /* We don't want to make debug symbol dynamic. */
4405 /* Check to see if we need to add an indirect symbol for
4406 the default name. */
4407 if (definition || h->root.type == bfd_link_hash_common)
4408 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4409 &sec, &value, &dynsym,
4411 goto error_free_vers;
4413 if (definition && !dynamic)
4415 char *p = strchr (name, ELF_VER_CHR);
4416 if (p != NULL && p[1] != ELF_VER_CHR)
4418 /* Queue non-default versions so that .symver x, x@FOO
4419 aliases can be checked. */
4422 amt = ((isymend - isym + 1)
4423 * sizeof (struct elf_link_hash_entry *));
4425 (struct elf_link_hash_entry **) bfd_malloc (amt);
4427 goto error_free_vers;
4429 nondeflt_vers[nondeflt_vers_cnt++] = h;
4433 if (dynsym && h->dynindx == -1)
4435 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4436 goto error_free_vers;
4437 if (h->u.weakdef != NULL
4439 && h->u.weakdef->dynindx == -1)
4441 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4442 goto error_free_vers;
4445 else if (dynsym && h->dynindx != -1)
4446 /* If the symbol already has a dynamic index, but
4447 visibility says it should not be visible, turn it into
4449 switch (ELF_ST_VISIBILITY (h->other))
4453 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4463 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4464 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4467 const char *soname = elf_dt_name (abfd);
4469 /* A symbol from a library loaded via DT_NEEDED of some
4470 other library is referenced by a regular object.
4471 Add a DT_NEEDED entry for it. Issue an error if
4472 --no-add-needed is used and the reference was not
4474 if (undef_bfd != NULL
4475 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4477 (*_bfd_error_handler)
4478 (_("%B: undefined reference to symbol '%s'"),
4480 (*_bfd_error_handler)
4481 (_("note: '%s' is defined in DSO %B so try adding it to the linker command line"),
4483 bfd_set_error (bfd_error_invalid_operation);
4484 goto error_free_vers;
4487 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4488 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4491 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4493 goto error_free_vers;
4495 BFD_ASSERT (ret == 0);
4500 if (extversym != NULL)
4506 if (isymbuf != NULL)
4512 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4516 /* Restore the symbol table. */
4517 if (bed->as_needed_cleanup)
4518 (*bed->as_needed_cleanup) (abfd, info);
4519 old_hash = (char *) old_tab + tabsize;
4520 old_ent = (char *) old_hash + hashsize;
4521 sym_hash = elf_sym_hashes (abfd);
4522 htab->root.table.table = old_table;
4523 htab->root.table.size = old_size;
4524 htab->root.table.count = old_count;
4525 memcpy (htab->root.table.table, old_tab, tabsize);
4526 memcpy (sym_hash, old_hash, hashsize);
4527 htab->root.undefs = old_undefs;
4528 htab->root.undefs_tail = old_undefs_tail;
4529 for (i = 0; i < htab->root.table.size; i++)
4531 struct bfd_hash_entry *p;
4532 struct elf_link_hash_entry *h;
4534 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4536 h = (struct elf_link_hash_entry *) p;
4537 if (h->root.type == bfd_link_hash_warning)
4538 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4539 if (h->dynindx >= old_dynsymcount)
4540 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4542 memcpy (p, old_ent, htab->root.table.entsize);
4543 old_ent = (char *) old_ent + htab->root.table.entsize;
4544 h = (struct elf_link_hash_entry *) p;
4545 if (h->root.type == bfd_link_hash_warning)
4547 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4548 old_ent = (char *) old_ent + htab->root.table.entsize;
4553 /* Make a special call to the linker "notice" function to
4554 tell it that symbols added for crefs may need to be removed. */
4555 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4557 goto error_free_vers;
4560 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4562 if (nondeflt_vers != NULL)
4563 free (nondeflt_vers);
4567 if (old_tab != NULL)
4569 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4571 goto error_free_vers;
4576 /* Now that all the symbols from this input file are created, handle
4577 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4578 if (nondeflt_vers != NULL)
4580 bfd_size_type cnt, symidx;
4582 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4584 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4585 char *shortname, *p;
4587 p = strchr (h->root.root.string, ELF_VER_CHR);
4589 || (h->root.type != bfd_link_hash_defined
4590 && h->root.type != bfd_link_hash_defweak))
4593 amt = p - h->root.root.string;
4594 shortname = (char *) bfd_malloc (amt + 1);
4596 goto error_free_vers;
4597 memcpy (shortname, h->root.root.string, amt);
4598 shortname[amt] = '\0';
4600 hi = (struct elf_link_hash_entry *)
4601 bfd_link_hash_lookup (&htab->root, shortname,
4602 FALSE, FALSE, FALSE);
4604 && hi->root.type == h->root.type
4605 && hi->root.u.def.value == h->root.u.def.value
4606 && hi->root.u.def.section == h->root.u.def.section)
4608 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4609 hi->root.type = bfd_link_hash_indirect;
4610 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4611 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4612 sym_hash = elf_sym_hashes (abfd);
4614 for (symidx = 0; symidx < extsymcount; ++symidx)
4615 if (sym_hash[symidx] == hi)
4617 sym_hash[symidx] = h;
4623 free (nondeflt_vers);
4624 nondeflt_vers = NULL;
4627 /* Now set the weakdefs field correctly for all the weak defined
4628 symbols we found. The only way to do this is to search all the
4629 symbols. Since we only need the information for non functions in
4630 dynamic objects, that's the only time we actually put anything on
4631 the list WEAKS. We need this information so that if a regular
4632 object refers to a symbol defined weakly in a dynamic object, the
4633 real symbol in the dynamic object is also put in the dynamic
4634 symbols; we also must arrange for both symbols to point to the
4635 same memory location. We could handle the general case of symbol
4636 aliasing, but a general symbol alias can only be generated in
4637 assembler code, handling it correctly would be very time
4638 consuming, and other ELF linkers don't handle general aliasing
4642 struct elf_link_hash_entry **hpp;
4643 struct elf_link_hash_entry **hppend;
4644 struct elf_link_hash_entry **sorted_sym_hash;
4645 struct elf_link_hash_entry *h;
4648 /* Since we have to search the whole symbol list for each weak
4649 defined symbol, search time for N weak defined symbols will be
4650 O(N^2). Binary search will cut it down to O(NlogN). */
4651 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4652 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4653 if (sorted_sym_hash == NULL)
4655 sym_hash = sorted_sym_hash;
4656 hpp = elf_sym_hashes (abfd);
4657 hppend = hpp + extsymcount;
4659 for (; hpp < hppend; hpp++)
4663 && h->root.type == bfd_link_hash_defined
4664 && !bed->is_function_type (h->type))
4672 qsort (sorted_sym_hash, sym_count,
4673 sizeof (struct elf_link_hash_entry *),
4676 while (weaks != NULL)
4678 struct elf_link_hash_entry *hlook;
4685 weaks = hlook->u.weakdef;
4686 hlook->u.weakdef = NULL;
4688 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4689 || hlook->root.type == bfd_link_hash_defweak
4690 || hlook->root.type == bfd_link_hash_common
4691 || hlook->root.type == bfd_link_hash_indirect);
4692 slook = hlook->root.u.def.section;
4693 vlook = hlook->root.u.def.value;
4700 bfd_signed_vma vdiff;
4702 h = sorted_sym_hash [idx];
4703 vdiff = vlook - h->root.u.def.value;
4710 long sdiff = slook->id - h->root.u.def.section->id;
4723 /* We didn't find a value/section match. */
4727 for (i = ilook; i < sym_count; i++)
4729 h = sorted_sym_hash [i];
4731 /* Stop if value or section doesn't match. */
4732 if (h->root.u.def.value != vlook
4733 || h->root.u.def.section != slook)
4735 else if (h != hlook)
4737 hlook->u.weakdef = h;
4739 /* If the weak definition is in the list of dynamic
4740 symbols, make sure the real definition is put
4742 if (hlook->dynindx != -1 && h->dynindx == -1)
4744 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4747 free (sorted_sym_hash);
4752 /* If the real definition is in the list of dynamic
4753 symbols, make sure the weak definition is put
4754 there as well. If we don't do this, then the
4755 dynamic loader might not merge the entries for the
4756 real definition and the weak definition. */
4757 if (h->dynindx != -1 && hlook->dynindx == -1)
4759 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4760 goto err_free_sym_hash;
4767 free (sorted_sym_hash);
4770 if (bed->check_directives
4771 && !(*bed->check_directives) (abfd, info))
4774 /* If this object is the same format as the output object, and it is
4775 not a shared library, then let the backend look through the
4778 This is required to build global offset table entries and to
4779 arrange for dynamic relocs. It is not required for the
4780 particular common case of linking non PIC code, even when linking
4781 against shared libraries, but unfortunately there is no way of
4782 knowing whether an object file has been compiled PIC or not.
4783 Looking through the relocs is not particularly time consuming.
4784 The problem is that we must either (1) keep the relocs in memory,
4785 which causes the linker to require additional runtime memory or
4786 (2) read the relocs twice from the input file, which wastes time.
4787 This would be a good case for using mmap.
4789 I have no idea how to handle linking PIC code into a file of a
4790 different format. It probably can't be done. */
4792 && is_elf_hash_table (htab)
4793 && bed->check_relocs != NULL
4794 && elf_object_id (abfd) == elf_hash_table_id (htab)
4795 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4799 for (o = abfd->sections; o != NULL; o = o->next)
4801 Elf_Internal_Rela *internal_relocs;
4804 if ((o->flags & SEC_RELOC) == 0
4805 || o->reloc_count == 0
4806 || ((info->strip == strip_all || info->strip == strip_debugger)
4807 && (o->flags & SEC_DEBUGGING) != 0)
4808 || bfd_is_abs_section (o->output_section))
4811 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4813 if (internal_relocs == NULL)
4816 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4818 if (elf_section_data (o)->relocs != internal_relocs)
4819 free (internal_relocs);
4826 /* If this is a non-traditional link, try to optimize the handling
4827 of the .stab/.stabstr sections. */
4829 && ! info->traditional_format
4830 && is_elf_hash_table (htab)
4831 && (info->strip != strip_all && info->strip != strip_debugger))
4835 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4836 if (stabstr != NULL)
4838 bfd_size_type string_offset = 0;
4841 for (stab = abfd->sections; stab; stab = stab->next)
4842 if (CONST_STRNEQ (stab->name, ".stab")
4843 && (!stab->name[5] ||
4844 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4845 && (stab->flags & SEC_MERGE) == 0
4846 && !bfd_is_abs_section (stab->output_section))
4848 struct bfd_elf_section_data *secdata;
4850 secdata = elf_section_data (stab);
4851 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4852 stabstr, &secdata->sec_info,
4855 if (secdata->sec_info)
4856 stab->sec_info_type = ELF_INFO_TYPE_STABS;
4861 if (is_elf_hash_table (htab) && add_needed)
4863 /* Add this bfd to the loaded list. */
4864 struct elf_link_loaded_list *n;
4866 n = (struct elf_link_loaded_list *)
4867 bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4871 n->next = htab->loaded;
4878 if (old_tab != NULL)
4880 if (nondeflt_vers != NULL)
4881 free (nondeflt_vers);
4882 if (extversym != NULL)
4885 if (isymbuf != NULL)
4891 /* Return the linker hash table entry of a symbol that might be
4892 satisfied by an archive symbol. Return -1 on error. */
4894 struct elf_link_hash_entry *
4895 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4896 struct bfd_link_info *info,
4899 struct elf_link_hash_entry *h;
4903 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
4907 /* If this is a default version (the name contains @@), look up the
4908 symbol again with only one `@' as well as without the version.
4909 The effect is that references to the symbol with and without the
4910 version will be matched by the default symbol in the archive. */
4912 p = strchr (name, ELF_VER_CHR);
4913 if (p == NULL || p[1] != ELF_VER_CHR)
4916 /* First check with only one `@'. */
4917 len = strlen (name);
4918 copy = (char *) bfd_alloc (abfd, len);
4920 return (struct elf_link_hash_entry *) 0 - 1;
4922 first = p - name + 1;
4923 memcpy (copy, name, first);
4924 memcpy (copy + first, name + first + 1, len - first);
4926 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, FALSE);
4929 /* We also need to check references to the symbol without the
4931 copy[first - 1] = '\0';
4932 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4933 FALSE, FALSE, FALSE);
4936 bfd_release (abfd, copy);
4940 /* Add symbols from an ELF archive file to the linker hash table. We
4941 don't use _bfd_generic_link_add_archive_symbols because of a
4942 problem which arises on UnixWare. The UnixWare libc.so is an
4943 archive which includes an entry libc.so.1 which defines a bunch of
4944 symbols. The libc.so archive also includes a number of other
4945 object files, which also define symbols, some of which are the same
4946 as those defined in libc.so.1. Correct linking requires that we
4947 consider each object file in turn, and include it if it defines any
4948 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4949 this; it looks through the list of undefined symbols, and includes
4950 any object file which defines them. When this algorithm is used on
4951 UnixWare, it winds up pulling in libc.so.1 early and defining a
4952 bunch of symbols. This means that some of the other objects in the
4953 archive are not included in the link, which is incorrect since they
4954 precede libc.so.1 in the archive.
4956 Fortunately, ELF archive handling is simpler than that done by
4957 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4958 oddities. In ELF, if we find a symbol in the archive map, and the
4959 symbol is currently undefined, we know that we must pull in that
4962 Unfortunately, we do have to make multiple passes over the symbol
4963 table until nothing further is resolved. */
4966 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4969 bfd_boolean *defined = NULL;
4970 bfd_boolean *included = NULL;
4974 const struct elf_backend_data *bed;
4975 struct elf_link_hash_entry * (*archive_symbol_lookup)
4976 (bfd *, struct bfd_link_info *, const char *);
4978 if (! bfd_has_map (abfd))
4980 /* An empty archive is a special case. */
4981 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4983 bfd_set_error (bfd_error_no_armap);
4987 /* Keep track of all symbols we know to be already defined, and all
4988 files we know to be already included. This is to speed up the
4989 second and subsequent passes. */
4990 c = bfd_ardata (abfd)->symdef_count;
4994 amt *= sizeof (bfd_boolean);
4995 defined = (bfd_boolean *) bfd_zmalloc (amt);
4996 included = (bfd_boolean *) bfd_zmalloc (amt);
4997 if (defined == NULL || included == NULL)
5000 symdefs = bfd_ardata (abfd)->symdefs;
5001 bed = get_elf_backend_data (abfd);
5002 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5015 symdefend = symdef + c;
5016 for (i = 0; symdef < symdefend; symdef++, i++)
5018 struct elf_link_hash_entry *h;
5020 struct bfd_link_hash_entry *undefs_tail;
5023 if (defined[i] || included[i])
5025 if (symdef->file_offset == last)
5031 h = archive_symbol_lookup (abfd, info, symdef->name);
5032 if (h == (struct elf_link_hash_entry *) 0 - 1)
5038 if (h->root.type == bfd_link_hash_common)
5040 /* We currently have a common symbol. The archive map contains
5041 a reference to this symbol, so we may want to include it. We
5042 only want to include it however, if this archive element
5043 contains a definition of the symbol, not just another common
5046 Unfortunately some archivers (including GNU ar) will put
5047 declarations of common symbols into their archive maps, as
5048 well as real definitions, so we cannot just go by the archive
5049 map alone. Instead we must read in the element's symbol
5050 table and check that to see what kind of symbol definition
5052 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5055 else if (h->root.type != bfd_link_hash_undefined)
5057 if (h->root.type != bfd_link_hash_undefweak)
5062 /* We need to include this archive member. */
5063 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5064 if (element == NULL)
5067 if (! bfd_check_format (element, bfd_object))
5070 /* Doublecheck that we have not included this object
5071 already--it should be impossible, but there may be
5072 something wrong with the archive. */
5073 if (element->archive_pass != 0)
5075 bfd_set_error (bfd_error_bad_value);
5078 element->archive_pass = 1;
5080 undefs_tail = info->hash->undefs_tail;
5082 if (! (*info->callbacks->add_archive_element) (info, element,
5085 if (! bfd_link_add_symbols (element, info))
5088 /* If there are any new undefined symbols, we need to make
5089 another pass through the archive in order to see whether
5090 they can be defined. FIXME: This isn't perfect, because
5091 common symbols wind up on undefs_tail and because an
5092 undefined symbol which is defined later on in this pass
5093 does not require another pass. This isn't a bug, but it
5094 does make the code less efficient than it could be. */
5095 if (undefs_tail != info->hash->undefs_tail)
5098 /* Look backward to mark all symbols from this object file
5099 which we have already seen in this pass. */
5103 included[mark] = TRUE;
5108 while (symdefs[mark].file_offset == symdef->file_offset);
5110 /* We mark subsequent symbols from this object file as we go
5111 on through the loop. */
5112 last = symdef->file_offset;
5123 if (defined != NULL)
5125 if (included != NULL)
5130 /* Given an ELF BFD, add symbols to the global hash table as
5134 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5136 switch (bfd_get_format (abfd))
5139 return elf_link_add_object_symbols (abfd, info);
5141 return elf_link_add_archive_symbols (abfd, info);
5143 bfd_set_error (bfd_error_wrong_format);
5148 struct hash_codes_info
5150 unsigned long *hashcodes;
5154 /* This function will be called though elf_link_hash_traverse to store
5155 all hash value of the exported symbols in an array. */
5158 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5160 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5166 if (h->root.type == bfd_link_hash_warning)
5167 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5169 /* Ignore indirect symbols. These are added by the versioning code. */
5170 if (h->dynindx == -1)
5173 name = h->root.root.string;
5174 p = strchr (name, ELF_VER_CHR);
5177 alc = (char *) bfd_malloc (p - name + 1);
5183 memcpy (alc, name, p - name);
5184 alc[p - name] = '\0';
5188 /* Compute the hash value. */
5189 ha = bfd_elf_hash (name);
5191 /* Store the found hash value in the array given as the argument. */
5192 *(inf->hashcodes)++ = ha;
5194 /* And store it in the struct so that we can put it in the hash table
5196 h->u.elf_hash_value = ha;
5204 struct collect_gnu_hash_codes
5207 const struct elf_backend_data *bed;
5208 unsigned long int nsyms;
5209 unsigned long int maskbits;
5210 unsigned long int *hashcodes;
5211 unsigned long int *hashval;
5212 unsigned long int *indx;
5213 unsigned long int *counts;
5216 long int min_dynindx;
5217 unsigned long int bucketcount;
5218 unsigned long int symindx;
5219 long int local_indx;
5220 long int shift1, shift2;
5221 unsigned long int mask;
5225 /* This function will be called though elf_link_hash_traverse to store
5226 all hash value of the exported symbols in an array. */
5229 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5231 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5237 if (h->root.type == bfd_link_hash_warning)
5238 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5240 /* Ignore indirect symbols. These are added by the versioning code. */
5241 if (h->dynindx == -1)
5244 /* Ignore also local symbols and undefined symbols. */
5245 if (! (*s->bed->elf_hash_symbol) (h))
5248 name = h->root.root.string;
5249 p = strchr (name, ELF_VER_CHR);
5252 alc = (char *) bfd_malloc (p - name + 1);
5258 memcpy (alc, name, p - name);
5259 alc[p - name] = '\0';
5263 /* Compute the hash value. */
5264 ha = bfd_elf_gnu_hash (name);
5266 /* Store the found hash value in the array for compute_bucket_count,
5267 and also for .dynsym reordering purposes. */
5268 s->hashcodes[s->nsyms] = ha;
5269 s->hashval[h->dynindx] = ha;
5271 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5272 s->min_dynindx = h->dynindx;
5280 /* This function will be called though elf_link_hash_traverse to do
5281 final dynaminc symbol renumbering. */
5284 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5286 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5287 unsigned long int bucket;
5288 unsigned long int val;
5290 if (h->root.type == bfd_link_hash_warning)
5291 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5293 /* Ignore indirect symbols. */
5294 if (h->dynindx == -1)
5297 /* Ignore also local symbols and undefined symbols. */
5298 if (! (*s->bed->elf_hash_symbol) (h))
5300 if (h->dynindx >= s->min_dynindx)
5301 h->dynindx = s->local_indx++;
5305 bucket = s->hashval[h->dynindx] % s->bucketcount;
5306 val = (s->hashval[h->dynindx] >> s->shift1)
5307 & ((s->maskbits >> s->shift1) - 1);
5308 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5310 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5311 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5312 if (s->counts[bucket] == 1)
5313 /* Last element terminates the chain. */
5315 bfd_put_32 (s->output_bfd, val,
5316 s->contents + (s->indx[bucket] - s->symindx) * 4);
5317 --s->counts[bucket];
5318 h->dynindx = s->indx[bucket]++;
5322 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5325 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5327 return !(h->forced_local
5328 || h->root.type == bfd_link_hash_undefined
5329 || h->root.type == bfd_link_hash_undefweak
5330 || ((h->root.type == bfd_link_hash_defined
5331 || h->root.type == bfd_link_hash_defweak)
5332 && h->root.u.def.section->output_section == NULL));
5335 /* Array used to determine the number of hash table buckets to use
5336 based on the number of symbols there are. If there are fewer than
5337 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5338 fewer than 37 we use 17 buckets, and so forth. We never use more
5339 than 32771 buckets. */
5341 static const size_t elf_buckets[] =
5343 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5347 /* Compute bucket count for hashing table. We do not use a static set
5348 of possible tables sizes anymore. Instead we determine for all
5349 possible reasonable sizes of the table the outcome (i.e., the
5350 number of collisions etc) and choose the best solution. The
5351 weighting functions are not too simple to allow the table to grow
5352 without bounds. Instead one of the weighting factors is the size.
5353 Therefore the result is always a good payoff between few collisions
5354 (= short chain lengths) and table size. */
5356 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5357 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5358 unsigned long int nsyms,
5361 size_t best_size = 0;
5362 unsigned long int i;
5364 /* We have a problem here. The following code to optimize the table
5365 size requires an integer type with more the 32 bits. If
5366 BFD_HOST_U_64_BIT is set we know about such a type. */
5367 #ifdef BFD_HOST_U_64_BIT
5372 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5373 bfd *dynobj = elf_hash_table (info)->dynobj;
5374 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5375 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5376 unsigned long int *counts;
5378 unsigned int no_improvement_count = 0;
5380 /* Possible optimization parameters: if we have NSYMS symbols we say
5381 that the hashing table must at least have NSYMS/4 and at most
5383 minsize = nsyms / 4;
5386 best_size = maxsize = nsyms * 2;
5391 if ((best_size & 31) == 0)
5395 /* Create array where we count the collisions in. We must use bfd_malloc
5396 since the size could be large. */
5398 amt *= sizeof (unsigned long int);
5399 counts = (unsigned long int *) bfd_malloc (amt);
5403 /* Compute the "optimal" size for the hash table. The criteria is a
5404 minimal chain length. The minor criteria is (of course) the size
5406 for (i = minsize; i < maxsize; ++i)
5408 /* Walk through the array of hashcodes and count the collisions. */
5409 BFD_HOST_U_64_BIT max;
5410 unsigned long int j;
5411 unsigned long int fact;
5413 if (gnu_hash && (i & 31) == 0)
5416 memset (counts, '\0', i * sizeof (unsigned long int));
5418 /* Determine how often each hash bucket is used. */
5419 for (j = 0; j < nsyms; ++j)
5420 ++counts[hashcodes[j] % i];
5422 /* For the weight function we need some information about the
5423 pagesize on the target. This is information need not be 100%
5424 accurate. Since this information is not available (so far) we
5425 define it here to a reasonable default value. If it is crucial
5426 to have a better value some day simply define this value. */
5427 # ifndef BFD_TARGET_PAGESIZE
5428 # define BFD_TARGET_PAGESIZE (4096)
5431 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5433 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5436 /* Variant 1: optimize for short chains. We add the squares
5437 of all the chain lengths (which favors many small chain
5438 over a few long chains). */
5439 for (j = 0; j < i; ++j)
5440 max += counts[j] * counts[j];
5442 /* This adds penalties for the overall size of the table. */
5443 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5446 /* Variant 2: Optimize a lot more for small table. Here we
5447 also add squares of the size but we also add penalties for
5448 empty slots (the +1 term). */
5449 for (j = 0; j < i; ++j)
5450 max += (1 + counts[j]) * (1 + counts[j]);
5452 /* The overall size of the table is considered, but not as
5453 strong as in variant 1, where it is squared. */
5454 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5458 /* Compare with current best results. */
5459 if (max < best_chlen)
5463 no_improvement_count = 0;
5465 /* PR 11843: Avoid futile long searches for the best bucket size
5466 when there are a large number of symbols. */
5467 else if (++no_improvement_count == 100)
5474 #endif /* defined (BFD_HOST_U_64_BIT) */
5476 /* This is the fallback solution if no 64bit type is available or if we
5477 are not supposed to spend much time on optimizations. We select the
5478 bucket count using a fixed set of numbers. */
5479 for (i = 0; elf_buckets[i] != 0; i++)
5481 best_size = elf_buckets[i];
5482 if (nsyms < elf_buckets[i + 1])
5485 if (gnu_hash && best_size < 2)
5492 /* Size any SHT_GROUP section for ld -r. */
5495 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5499 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
5500 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5501 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5506 /* Set up the sizes and contents of the ELF dynamic sections. This is
5507 called by the ELF linker emulation before_allocation routine. We
5508 must set the sizes of the sections before the linker sets the
5509 addresses of the various sections. */
5512 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5515 const char *filter_shlib,
5517 const char *depaudit,
5518 const char * const *auxiliary_filters,
5519 struct bfd_link_info *info,
5520 asection **sinterpptr,
5521 struct bfd_elf_version_tree *verdefs)
5523 bfd_size_type soname_indx;
5525 const struct elf_backend_data *bed;
5526 struct elf_info_failed asvinfo;
5530 soname_indx = (bfd_size_type) -1;
5532 if (!is_elf_hash_table (info->hash))
5535 bed = get_elf_backend_data (output_bfd);
5536 if (info->execstack)
5537 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
5538 else if (info->noexecstack)
5539 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W;
5543 asection *notesec = NULL;
5546 for (inputobj = info->input_bfds;
5548 inputobj = inputobj->link_next)
5552 if (inputobj->flags & (DYNAMIC | EXEC_P | BFD_LINKER_CREATED))
5554 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5557 if (s->flags & SEC_CODE)
5561 else if (bed->default_execstack)
5566 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec;
5567 if (exec && info->relocatable
5568 && notesec->output_section != bfd_abs_section_ptr)
5569 notesec->output_section->flags |= SEC_CODE;
5573 /* Any syms created from now on start with -1 in
5574 got.refcount/offset and plt.refcount/offset. */
5575 elf_hash_table (info)->init_got_refcount
5576 = elf_hash_table (info)->init_got_offset;
5577 elf_hash_table (info)->init_plt_refcount
5578 = elf_hash_table (info)->init_plt_offset;
5580 if (info->relocatable
5581 && !_bfd_elf_size_group_sections (info))
5584 /* The backend may have to create some sections regardless of whether
5585 we're dynamic or not. */
5586 if (bed->elf_backend_always_size_sections
5587 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5590 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5593 dynobj = elf_hash_table (info)->dynobj;
5595 /* If there were no dynamic objects in the link, there is nothing to
5600 if (elf_hash_table (info)->dynamic_sections_created)
5602 struct elf_info_failed eif;
5603 struct elf_link_hash_entry *h;
5605 struct bfd_elf_version_tree *t;
5606 struct bfd_elf_version_expr *d;
5608 bfd_boolean all_defined;
5610 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
5611 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5615 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5617 if (soname_indx == (bfd_size_type) -1
5618 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5624 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5626 info->flags |= DF_SYMBOLIC;
5633 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5635 if (indx == (bfd_size_type) -1
5636 || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))
5639 if (info->new_dtags)
5641 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
5642 if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx))
5647 if (filter_shlib != NULL)
5651 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5652 filter_shlib, TRUE);
5653 if (indx == (bfd_size_type) -1
5654 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5658 if (auxiliary_filters != NULL)
5660 const char * const *p;
5662 for (p = auxiliary_filters; *p != NULL; p++)
5666 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5668 if (indx == (bfd_size_type) -1
5669 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5678 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5680 if (indx == (bfd_size_type) -1
5681 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5685 if (depaudit != NULL)
5689 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5691 if (indx == (bfd_size_type) -1
5692 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5697 eif.verdefs = verdefs;
5700 /* If we are supposed to export all symbols into the dynamic symbol
5701 table (this is not the normal case), then do so. */
5702 if (info->export_dynamic
5703 || (info->executable && info->dynamic))
5705 elf_link_hash_traverse (elf_hash_table (info),
5706 _bfd_elf_export_symbol,
5712 /* Make all global versions with definition. */
5713 for (t = verdefs; t != NULL; t = t->next)
5714 for (d = t->globals.list; d != NULL; d = d->next)
5715 if (!d->symver && d->literal)
5717 const char *verstr, *name;
5718 size_t namelen, verlen, newlen;
5720 struct elf_link_hash_entry *newh;
5723 namelen = strlen (name);
5725 verlen = strlen (verstr);
5726 newlen = namelen + verlen + 3;
5728 newname = (char *) bfd_malloc (newlen);
5729 if (newname == NULL)
5731 memcpy (newname, name, namelen);
5733 /* Check the hidden versioned definition. */
5734 p = newname + namelen;
5736 memcpy (p, verstr, verlen + 1);
5737 newh = elf_link_hash_lookup (elf_hash_table (info),
5738 newname, FALSE, FALSE,
5741 || (newh->root.type != bfd_link_hash_defined
5742 && newh->root.type != bfd_link_hash_defweak))
5744 /* Check the default versioned definition. */
5746 memcpy (p, verstr, verlen + 1);
5747 newh = elf_link_hash_lookup (elf_hash_table (info),
5748 newname, FALSE, FALSE,
5753 /* Mark this version if there is a definition and it is
5754 not defined in a shared object. */
5756 && !newh->def_dynamic
5757 && (newh->root.type == bfd_link_hash_defined
5758 || newh->root.type == bfd_link_hash_defweak))
5762 /* Attach all the symbols to their version information. */
5763 asvinfo.info = info;
5764 asvinfo.verdefs = verdefs;
5765 asvinfo.failed = FALSE;
5767 elf_link_hash_traverse (elf_hash_table (info),
5768 _bfd_elf_link_assign_sym_version,
5773 if (!info->allow_undefined_version)
5775 /* Check if all global versions have a definition. */
5777 for (t = verdefs; t != NULL; t = t->next)
5778 for (d = t->globals.list; d != NULL; d = d->next)
5779 if (d->literal && !d->symver && !d->script)
5781 (*_bfd_error_handler)
5782 (_("%s: undefined version: %s"),
5783 d->pattern, t->name);
5784 all_defined = FALSE;
5789 bfd_set_error (bfd_error_bad_value);
5794 /* Find all symbols which were defined in a dynamic object and make
5795 the backend pick a reasonable value for them. */
5796 elf_link_hash_traverse (elf_hash_table (info),
5797 _bfd_elf_adjust_dynamic_symbol,
5802 /* Add some entries to the .dynamic section. We fill in some of the
5803 values later, in bfd_elf_final_link, but we must add the entries
5804 now so that we know the final size of the .dynamic section. */
5806 /* If there are initialization and/or finalization functions to
5807 call then add the corresponding DT_INIT/DT_FINI entries. */
5808 h = (info->init_function
5809 ? elf_link_hash_lookup (elf_hash_table (info),
5810 info->init_function, FALSE,
5817 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5820 h = (info->fini_function
5821 ? elf_link_hash_lookup (elf_hash_table (info),
5822 info->fini_function, FALSE,
5829 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5833 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5834 if (s != NULL && s->linker_has_input)
5836 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5837 if (! info->executable)
5842 for (sub = info->input_bfds; sub != NULL;
5843 sub = sub->link_next)
5844 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5845 for (o = sub->sections; o != NULL; o = o->next)
5846 if (elf_section_data (o)->this_hdr.sh_type
5847 == SHT_PREINIT_ARRAY)
5849 (*_bfd_error_handler)
5850 (_("%B: .preinit_array section is not allowed in DSO"),
5855 bfd_set_error (bfd_error_nonrepresentable_section);
5859 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5860 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5863 s = bfd_get_section_by_name (output_bfd, ".init_array");
5864 if (s != NULL && s->linker_has_input)
5866 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5867 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5870 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5871 if (s != NULL && s->linker_has_input)
5873 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5874 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5878 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
5879 /* If .dynstr is excluded from the link, we don't want any of
5880 these tags. Strictly, we should be checking each section
5881 individually; This quick check covers for the case where
5882 someone does a /DISCARD/ : { *(*) }. */
5883 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5885 bfd_size_type strsize;
5887 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5888 if ((info->emit_hash
5889 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5890 || (info->emit_gnu_hash
5891 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5892 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5893 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5894 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5895 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5896 bed->s->sizeof_sym))
5901 /* The backend must work out the sizes of all the other dynamic
5903 if (bed->elf_backend_size_dynamic_sections
5904 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5907 if (elf_hash_table (info)->dynamic_sections_created)
5909 unsigned long section_sym_count;
5912 /* Set up the version definition section. */
5913 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
5914 BFD_ASSERT (s != NULL);
5916 /* We may have created additional version definitions if we are
5917 just linking a regular application. */
5918 verdefs = asvinfo.verdefs;
5920 /* Skip anonymous version tag. */
5921 if (verdefs != NULL && verdefs->vernum == 0)
5922 verdefs = verdefs->next;
5924 if (verdefs == NULL && !info->create_default_symver)
5925 s->flags |= SEC_EXCLUDE;
5930 struct bfd_elf_version_tree *t;
5932 Elf_Internal_Verdef def;
5933 Elf_Internal_Verdaux defaux;
5934 struct bfd_link_hash_entry *bh;
5935 struct elf_link_hash_entry *h;
5941 /* Make space for the base version. */
5942 size += sizeof (Elf_External_Verdef);
5943 size += sizeof (Elf_External_Verdaux);
5946 /* Make space for the default version. */
5947 if (info->create_default_symver)
5949 size += sizeof (Elf_External_Verdef);
5953 for (t = verdefs; t != NULL; t = t->next)
5955 struct bfd_elf_version_deps *n;
5957 /* Don't emit base version twice. */
5961 size += sizeof (Elf_External_Verdef);
5962 size += sizeof (Elf_External_Verdaux);
5965 for (n = t->deps; n != NULL; n = n->next)
5966 size += sizeof (Elf_External_Verdaux);
5970 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
5971 if (s->contents == NULL && s->size != 0)
5974 /* Fill in the version definition section. */
5978 def.vd_version = VER_DEF_CURRENT;
5979 def.vd_flags = VER_FLG_BASE;
5982 if (info->create_default_symver)
5984 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
5985 def.vd_next = sizeof (Elf_External_Verdef);
5989 def.vd_aux = sizeof (Elf_External_Verdef);
5990 def.vd_next = (sizeof (Elf_External_Verdef)
5991 + sizeof (Elf_External_Verdaux));
5994 if (soname_indx != (bfd_size_type) -1)
5996 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5998 def.vd_hash = bfd_elf_hash (soname);
5999 defaux.vda_name = soname_indx;
6006 name = lbasename (output_bfd->filename);
6007 def.vd_hash = bfd_elf_hash (name);
6008 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6010 if (indx == (bfd_size_type) -1)
6012 defaux.vda_name = indx;
6014 defaux.vda_next = 0;
6016 _bfd_elf_swap_verdef_out (output_bfd, &def,
6017 (Elf_External_Verdef *) p);
6018 p += sizeof (Elf_External_Verdef);
6019 if (info->create_default_symver)
6021 /* Add a symbol representing this version. */
6023 if (! (_bfd_generic_link_add_one_symbol
6024 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6026 get_elf_backend_data (dynobj)->collect, &bh)))
6028 h = (struct elf_link_hash_entry *) bh;
6031 h->type = STT_OBJECT;
6032 h->verinfo.vertree = NULL;
6034 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6037 /* Create a duplicate of the base version with the same
6038 aux block, but different flags. */
6041 def.vd_aux = sizeof (Elf_External_Verdef);
6043 def.vd_next = (sizeof (Elf_External_Verdef)
6044 + sizeof (Elf_External_Verdaux));
6047 _bfd_elf_swap_verdef_out (output_bfd, &def,
6048 (Elf_External_Verdef *) p);
6049 p += sizeof (Elf_External_Verdef);
6051 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6052 (Elf_External_Verdaux *) p);
6053 p += sizeof (Elf_External_Verdaux);
6055 for (t = verdefs; t != NULL; t = t->next)
6058 struct bfd_elf_version_deps *n;
6060 /* Don't emit the base version twice. */
6065 for (n = t->deps; n != NULL; n = n->next)
6068 /* Add a symbol representing this version. */
6070 if (! (_bfd_generic_link_add_one_symbol
6071 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6073 get_elf_backend_data (dynobj)->collect, &bh)))
6075 h = (struct elf_link_hash_entry *) bh;
6078 h->type = STT_OBJECT;
6079 h->verinfo.vertree = t;
6081 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6084 def.vd_version = VER_DEF_CURRENT;
6086 if (t->globals.list == NULL
6087 && t->locals.list == NULL
6089 def.vd_flags |= VER_FLG_WEAK;
6090 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6091 def.vd_cnt = cdeps + 1;
6092 def.vd_hash = bfd_elf_hash (t->name);
6093 def.vd_aux = sizeof (Elf_External_Verdef);
6096 /* If a basever node is next, it *must* be the last node in
6097 the chain, otherwise Verdef construction breaks. */
6098 if (t->next != NULL && t->next->vernum == 0)
6099 BFD_ASSERT (t->next->next == NULL);
6101 if (t->next != NULL && t->next->vernum != 0)
6102 def.vd_next = (sizeof (Elf_External_Verdef)
6103 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6105 _bfd_elf_swap_verdef_out (output_bfd, &def,
6106 (Elf_External_Verdef *) p);
6107 p += sizeof (Elf_External_Verdef);
6109 defaux.vda_name = h->dynstr_index;
6110 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6112 defaux.vda_next = 0;
6113 if (t->deps != NULL)
6114 defaux.vda_next = sizeof (Elf_External_Verdaux);
6115 t->name_indx = defaux.vda_name;
6117 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6118 (Elf_External_Verdaux *) p);
6119 p += sizeof (Elf_External_Verdaux);
6121 for (n = t->deps; n != NULL; n = n->next)
6123 if (n->version_needed == NULL)
6125 /* This can happen if there was an error in the
6127 defaux.vda_name = 0;
6131 defaux.vda_name = n->version_needed->name_indx;
6132 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6135 if (n->next == NULL)
6136 defaux.vda_next = 0;
6138 defaux.vda_next = sizeof (Elf_External_Verdaux);
6140 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6141 (Elf_External_Verdaux *) p);
6142 p += sizeof (Elf_External_Verdaux);
6146 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6147 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6150 elf_tdata (output_bfd)->cverdefs = cdefs;
6153 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6155 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6158 else if (info->flags & DF_BIND_NOW)
6160 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6166 if (info->executable)
6167 info->flags_1 &= ~ (DF_1_INITFIRST
6170 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6174 /* Work out the size of the version reference section. */
6176 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
6177 BFD_ASSERT (s != NULL);
6179 struct elf_find_verdep_info sinfo;
6182 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6183 if (sinfo.vers == 0)
6185 sinfo.failed = FALSE;
6187 elf_link_hash_traverse (elf_hash_table (info),
6188 _bfd_elf_link_find_version_dependencies,
6193 if (elf_tdata (output_bfd)->verref == NULL)
6194 s->flags |= SEC_EXCLUDE;
6197 Elf_Internal_Verneed *t;
6202 /* Build the version dependency section. */
6205 for (t = elf_tdata (output_bfd)->verref;
6209 Elf_Internal_Vernaux *a;
6211 size += sizeof (Elf_External_Verneed);
6213 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6214 size += sizeof (Elf_External_Vernaux);
6218 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6219 if (s->contents == NULL)
6223 for (t = elf_tdata (output_bfd)->verref;
6228 Elf_Internal_Vernaux *a;
6232 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6235 t->vn_version = VER_NEED_CURRENT;
6237 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6238 elf_dt_name (t->vn_bfd) != NULL
6239 ? elf_dt_name (t->vn_bfd)
6240 : lbasename (t->vn_bfd->filename),
6242 if (indx == (bfd_size_type) -1)
6245 t->vn_aux = sizeof (Elf_External_Verneed);
6246 if (t->vn_nextref == NULL)
6249 t->vn_next = (sizeof (Elf_External_Verneed)
6250 + caux * sizeof (Elf_External_Vernaux));
6252 _bfd_elf_swap_verneed_out (output_bfd, t,
6253 (Elf_External_Verneed *) p);
6254 p += sizeof (Elf_External_Verneed);
6256 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6258 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6259 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6260 a->vna_nodename, FALSE);
6261 if (indx == (bfd_size_type) -1)
6264 if (a->vna_nextptr == NULL)
6267 a->vna_next = sizeof (Elf_External_Vernaux);
6269 _bfd_elf_swap_vernaux_out (output_bfd, a,
6270 (Elf_External_Vernaux *) p);
6271 p += sizeof (Elf_External_Vernaux);
6275 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6276 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6279 elf_tdata (output_bfd)->cverrefs = crefs;
6283 if ((elf_tdata (output_bfd)->cverrefs == 0
6284 && elf_tdata (output_bfd)->cverdefs == 0)
6285 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6286 §ion_sym_count) == 0)
6288 s = bfd_get_section_by_name (dynobj, ".gnu.version");
6289 s->flags |= SEC_EXCLUDE;
6295 /* Find the first non-excluded output section. We'll use its
6296 section symbol for some emitted relocs. */
6298 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6302 for (s = output_bfd->sections; s != NULL; s = s->next)
6303 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6304 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6306 elf_hash_table (info)->text_index_section = s;
6311 /* Find two non-excluded output sections, one for code, one for data.
6312 We'll use their section symbols for some emitted relocs. */
6314 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6318 /* Data first, since setting text_index_section changes
6319 _bfd_elf_link_omit_section_dynsym. */
6320 for (s = output_bfd->sections; s != NULL; s = s->next)
6321 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6322 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6324 elf_hash_table (info)->data_index_section = s;
6328 for (s = output_bfd->sections; s != NULL; s = s->next)
6329 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6330 == (SEC_ALLOC | SEC_READONLY))
6331 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6333 elf_hash_table (info)->text_index_section = s;
6337 if (elf_hash_table (info)->text_index_section == NULL)
6338 elf_hash_table (info)->text_index_section
6339 = elf_hash_table (info)->data_index_section;
6343 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6345 const struct elf_backend_data *bed;
6347 if (!is_elf_hash_table (info->hash))
6350 bed = get_elf_backend_data (output_bfd);
6351 (*bed->elf_backend_init_index_section) (output_bfd, info);
6353 if (elf_hash_table (info)->dynamic_sections_created)
6357 bfd_size_type dynsymcount;
6358 unsigned long section_sym_count;
6359 unsigned int dtagcount;
6361 dynobj = elf_hash_table (info)->dynobj;
6363 /* Assign dynsym indicies. In a shared library we generate a
6364 section symbol for each output section, which come first.
6365 Next come all of the back-end allocated local dynamic syms,
6366 followed by the rest of the global symbols. */
6368 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6369 §ion_sym_count);
6371 /* Work out the size of the symbol version section. */
6372 s = bfd_get_section_by_name (dynobj, ".gnu.version");
6373 BFD_ASSERT (s != NULL);
6374 if (dynsymcount != 0
6375 && (s->flags & SEC_EXCLUDE) == 0)
6377 s->size = dynsymcount * sizeof (Elf_External_Versym);
6378 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6379 if (s->contents == NULL)
6382 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6386 /* Set the size of the .dynsym and .hash sections. We counted
6387 the number of dynamic symbols in elf_link_add_object_symbols.
6388 We will build the contents of .dynsym and .hash when we build
6389 the final symbol table, because until then we do not know the
6390 correct value to give the symbols. We built the .dynstr
6391 section as we went along in elf_link_add_object_symbols. */
6392 s = bfd_get_section_by_name (dynobj, ".dynsym");
6393 BFD_ASSERT (s != NULL);
6394 s->size = dynsymcount * bed->s->sizeof_sym;
6396 if (dynsymcount != 0)
6398 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6399 if (s->contents == NULL)
6402 /* The first entry in .dynsym is a dummy symbol.
6403 Clear all the section syms, in case we don't output them all. */
6404 ++section_sym_count;
6405 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6408 elf_hash_table (info)->bucketcount = 0;
6410 /* Compute the size of the hashing table. As a side effect this
6411 computes the hash values for all the names we export. */
6412 if (info->emit_hash)
6414 unsigned long int *hashcodes;
6415 struct hash_codes_info hashinf;
6417 unsigned long int nsyms;
6419 size_t hash_entry_size;
6421 /* Compute the hash values for all exported symbols. At the same
6422 time store the values in an array so that we could use them for
6424 amt = dynsymcount * sizeof (unsigned long int);
6425 hashcodes = (unsigned long int *) bfd_malloc (amt);
6426 if (hashcodes == NULL)
6428 hashinf.hashcodes = hashcodes;
6429 hashinf.error = FALSE;
6431 /* Put all hash values in HASHCODES. */
6432 elf_link_hash_traverse (elf_hash_table (info),
6433 elf_collect_hash_codes, &hashinf);
6440 nsyms = hashinf.hashcodes - hashcodes;
6442 = compute_bucket_count (info, hashcodes, nsyms, 0);
6445 if (bucketcount == 0)
6448 elf_hash_table (info)->bucketcount = bucketcount;
6450 s = bfd_get_section_by_name (dynobj, ".hash");
6451 BFD_ASSERT (s != NULL);
6452 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6453 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6454 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6455 if (s->contents == NULL)
6458 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6459 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6460 s->contents + hash_entry_size);
6463 if (info->emit_gnu_hash)
6466 unsigned char *contents;
6467 struct collect_gnu_hash_codes cinfo;
6471 memset (&cinfo, 0, sizeof (cinfo));
6473 /* Compute the hash values for all exported symbols. At the same
6474 time store the values in an array so that we could use them for
6476 amt = dynsymcount * 2 * sizeof (unsigned long int);
6477 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6478 if (cinfo.hashcodes == NULL)
6481 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6482 cinfo.min_dynindx = -1;
6483 cinfo.output_bfd = output_bfd;
6486 /* Put all hash values in HASHCODES. */
6487 elf_link_hash_traverse (elf_hash_table (info),
6488 elf_collect_gnu_hash_codes, &cinfo);
6491 free (cinfo.hashcodes);
6496 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6498 if (bucketcount == 0)
6500 free (cinfo.hashcodes);
6504 s = bfd_get_section_by_name (dynobj, ".gnu.hash");
6505 BFD_ASSERT (s != NULL);
6507 if (cinfo.nsyms == 0)
6509 /* Empty .gnu.hash section is special. */
6510 BFD_ASSERT (cinfo.min_dynindx == -1);
6511 free (cinfo.hashcodes);
6512 s->size = 5 * 4 + bed->s->arch_size / 8;
6513 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6514 if (contents == NULL)
6516 s->contents = contents;
6517 /* 1 empty bucket. */
6518 bfd_put_32 (output_bfd, 1, contents);
6519 /* SYMIDX above the special symbol 0. */
6520 bfd_put_32 (output_bfd, 1, contents + 4);
6521 /* Just one word for bitmask. */
6522 bfd_put_32 (output_bfd, 1, contents + 8);
6523 /* Only hash fn bloom filter. */
6524 bfd_put_32 (output_bfd, 0, contents + 12);
6525 /* No hashes are valid - empty bitmask. */
6526 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6527 /* No hashes in the only bucket. */
6528 bfd_put_32 (output_bfd, 0,
6529 contents + 16 + bed->s->arch_size / 8);
6533 unsigned long int maskwords, maskbitslog2;
6534 BFD_ASSERT (cinfo.min_dynindx != -1);
6536 maskbitslog2 = bfd_log2 (cinfo.nsyms) + 1;
6537 if (maskbitslog2 < 3)
6539 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6540 maskbitslog2 = maskbitslog2 + 3;
6542 maskbitslog2 = maskbitslog2 + 2;
6543 if (bed->s->arch_size == 64)
6545 if (maskbitslog2 == 5)
6551 cinfo.mask = (1 << cinfo.shift1) - 1;
6552 cinfo.shift2 = maskbitslog2;
6553 cinfo.maskbits = 1 << maskbitslog2;
6554 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6555 amt = bucketcount * sizeof (unsigned long int) * 2;
6556 amt += maskwords * sizeof (bfd_vma);
6557 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6558 if (cinfo.bitmask == NULL)
6560 free (cinfo.hashcodes);
6564 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6565 cinfo.indx = cinfo.counts + bucketcount;
6566 cinfo.symindx = dynsymcount - cinfo.nsyms;
6567 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6569 /* Determine how often each hash bucket is used. */
6570 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6571 for (i = 0; i < cinfo.nsyms; ++i)
6572 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6574 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6575 if (cinfo.counts[i] != 0)
6577 cinfo.indx[i] = cnt;
6578 cnt += cinfo.counts[i];
6580 BFD_ASSERT (cnt == dynsymcount);
6581 cinfo.bucketcount = bucketcount;
6582 cinfo.local_indx = cinfo.min_dynindx;
6584 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6585 s->size += cinfo.maskbits / 8;
6586 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6587 if (contents == NULL)
6589 free (cinfo.bitmask);
6590 free (cinfo.hashcodes);
6594 s->contents = contents;
6595 bfd_put_32 (output_bfd, bucketcount, contents);
6596 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6597 bfd_put_32 (output_bfd, maskwords, contents + 8);
6598 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6599 contents += 16 + cinfo.maskbits / 8;
6601 for (i = 0; i < bucketcount; ++i)
6603 if (cinfo.counts[i] == 0)
6604 bfd_put_32 (output_bfd, 0, contents);
6606 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6610 cinfo.contents = contents;
6612 /* Renumber dynamic symbols, populate .gnu.hash section. */
6613 elf_link_hash_traverse (elf_hash_table (info),
6614 elf_renumber_gnu_hash_syms, &cinfo);
6616 contents = s->contents + 16;
6617 for (i = 0; i < maskwords; ++i)
6619 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6621 contents += bed->s->arch_size / 8;
6624 free (cinfo.bitmask);
6625 free (cinfo.hashcodes);
6629 s = bfd_get_section_by_name (dynobj, ".dynstr");
6630 BFD_ASSERT (s != NULL);
6632 elf_finalize_dynstr (output_bfd, info);
6634 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6636 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6637 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6644 /* Indicate that we are only retrieving symbol values from this
6648 _bfd_elf_link_just_syms (asection *sec, struct bfd_link_info *info)
6650 if (is_elf_hash_table (info->hash))
6651 sec->sec_info_type = ELF_INFO_TYPE_JUST_SYMS;
6652 _bfd_generic_link_just_syms (sec, info);
6655 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6658 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6661 BFD_ASSERT (sec->sec_info_type == ELF_INFO_TYPE_MERGE);
6662 sec->sec_info_type = ELF_INFO_TYPE_NONE;
6665 /* Finish SHF_MERGE section merging. */
6668 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6673 if (!is_elf_hash_table (info->hash))
6676 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6677 if ((ibfd->flags & DYNAMIC) == 0)
6678 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6679 if ((sec->flags & SEC_MERGE) != 0
6680 && !bfd_is_abs_section (sec->output_section))
6682 struct bfd_elf_section_data *secdata;
6684 secdata = elf_section_data (sec);
6685 if (! _bfd_add_merge_section (abfd,
6686 &elf_hash_table (info)->merge_info,
6687 sec, &secdata->sec_info))
6689 else if (secdata->sec_info)
6690 sec->sec_info_type = ELF_INFO_TYPE_MERGE;
6693 if (elf_hash_table (info)->merge_info != NULL)
6694 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6695 merge_sections_remove_hook);
6699 /* Create an entry in an ELF linker hash table. */
6701 struct bfd_hash_entry *
6702 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6703 struct bfd_hash_table *table,
6706 /* Allocate the structure if it has not already been allocated by a
6710 entry = (struct bfd_hash_entry *)
6711 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6716 /* Call the allocation method of the superclass. */
6717 entry = _bfd_link_hash_newfunc (entry, table, string);
6720 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6721 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6723 /* Set local fields. */
6726 ret->got = htab->init_got_refcount;
6727 ret->plt = htab->init_plt_refcount;
6728 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6729 - offsetof (struct elf_link_hash_entry, size)));
6730 /* Assume that we have been called by a non-ELF symbol reader.
6731 This flag is then reset by the code which reads an ELF input
6732 file. This ensures that a symbol created by a non-ELF symbol
6733 reader will have the flag set correctly. */
6740 /* Copy data from an indirect symbol to its direct symbol, hiding the
6741 old indirect symbol. Also used for copying flags to a weakdef. */
6744 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6745 struct elf_link_hash_entry *dir,
6746 struct elf_link_hash_entry *ind)
6748 struct elf_link_hash_table *htab;
6750 /* Copy down any references that we may have already seen to the
6751 symbol which just became indirect. */
6753 dir->ref_dynamic |= ind->ref_dynamic;
6754 dir->ref_regular |= ind->ref_regular;
6755 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6756 dir->non_got_ref |= ind->non_got_ref;
6757 dir->needs_plt |= ind->needs_plt;
6758 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6760 if (ind->root.type != bfd_link_hash_indirect)
6763 /* Copy over the global and procedure linkage table refcount entries.
6764 These may have been already set up by a check_relocs routine. */
6765 htab = elf_hash_table (info);
6766 if (ind->got.refcount > htab->init_got_refcount.refcount)
6768 if (dir->got.refcount < 0)
6769 dir->got.refcount = 0;
6770 dir->got.refcount += ind->got.refcount;
6771 ind->got.refcount = htab->init_got_refcount.refcount;
6774 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6776 if (dir->plt.refcount < 0)
6777 dir->plt.refcount = 0;
6778 dir->plt.refcount += ind->plt.refcount;
6779 ind->plt.refcount = htab->init_plt_refcount.refcount;
6782 if (ind->dynindx != -1)
6784 if (dir->dynindx != -1)
6785 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6786 dir->dynindx = ind->dynindx;
6787 dir->dynstr_index = ind->dynstr_index;
6789 ind->dynstr_index = 0;
6794 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6795 struct elf_link_hash_entry *h,
6796 bfd_boolean force_local)
6798 /* STT_GNU_IFUNC symbol must go through PLT. */
6799 if (h->type != STT_GNU_IFUNC)
6801 h->plt = elf_hash_table (info)->init_plt_offset;
6806 h->forced_local = 1;
6807 if (h->dynindx != -1)
6810 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6816 /* Initialize an ELF linker hash table. */
6819 _bfd_elf_link_hash_table_init
6820 (struct elf_link_hash_table *table,
6822 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6823 struct bfd_hash_table *,
6825 unsigned int entsize,
6826 enum elf_target_id target_id)
6829 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6831 memset (table, 0, sizeof * table);
6832 table->init_got_refcount.refcount = can_refcount - 1;
6833 table->init_plt_refcount.refcount = can_refcount - 1;
6834 table->init_got_offset.offset = -(bfd_vma) 1;
6835 table->init_plt_offset.offset = -(bfd_vma) 1;
6836 /* The first dynamic symbol is a dummy. */
6837 table->dynsymcount = 1;
6839 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6841 table->root.type = bfd_link_elf_hash_table;
6842 table->hash_table_id = target_id;
6847 /* Create an ELF linker hash table. */
6849 struct bfd_link_hash_table *
6850 _bfd_elf_link_hash_table_create (bfd *abfd)
6852 struct elf_link_hash_table *ret;
6853 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6855 ret = (struct elf_link_hash_table *) bfd_malloc (amt);
6859 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6860 sizeof (struct elf_link_hash_entry),
6870 /* This is a hook for the ELF emulation code in the generic linker to
6871 tell the backend linker what file name to use for the DT_NEEDED
6872 entry for a dynamic object. */
6875 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6877 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6878 && bfd_get_format (abfd) == bfd_object)
6879 elf_dt_name (abfd) = name;
6883 bfd_elf_get_dyn_lib_class (bfd *abfd)
6886 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6887 && bfd_get_format (abfd) == bfd_object)
6888 lib_class = elf_dyn_lib_class (abfd);
6895 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6897 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6898 && bfd_get_format (abfd) == bfd_object)
6899 elf_dyn_lib_class (abfd) = lib_class;
6902 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6903 the linker ELF emulation code. */
6905 struct bfd_link_needed_list *
6906 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6907 struct bfd_link_info *info)
6909 if (! is_elf_hash_table (info->hash))
6911 return elf_hash_table (info)->needed;
6914 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6915 hook for the linker ELF emulation code. */
6917 struct bfd_link_needed_list *
6918 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6919 struct bfd_link_info *info)
6921 if (! is_elf_hash_table (info->hash))
6923 return elf_hash_table (info)->runpath;
6926 /* Get the name actually used for a dynamic object for a link. This
6927 is the SONAME entry if there is one. Otherwise, it is the string
6928 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6931 bfd_elf_get_dt_soname (bfd *abfd)
6933 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6934 && bfd_get_format (abfd) == bfd_object)
6935 return elf_dt_name (abfd);
6939 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6940 the ELF linker emulation code. */
6943 bfd_elf_get_bfd_needed_list (bfd *abfd,
6944 struct bfd_link_needed_list **pneeded)
6947 bfd_byte *dynbuf = NULL;
6948 unsigned int elfsec;
6949 unsigned long shlink;
6950 bfd_byte *extdyn, *extdynend;
6952 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6956 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6957 || bfd_get_format (abfd) != bfd_object)
6960 s = bfd_get_section_by_name (abfd, ".dynamic");
6961 if (s == NULL || s->size == 0)
6964 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6967 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6968 if (elfsec == SHN_BAD)
6971 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6973 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6974 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
6977 extdynend = extdyn + s->size;
6978 for (; extdyn < extdynend; extdyn += extdynsize)
6980 Elf_Internal_Dyn dyn;
6982 (*swap_dyn_in) (abfd, extdyn, &dyn);
6984 if (dyn.d_tag == DT_NULL)
6987 if (dyn.d_tag == DT_NEEDED)
6990 struct bfd_link_needed_list *l;
6991 unsigned int tagv = dyn.d_un.d_val;
6994 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
6999 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7020 struct elf_symbuf_symbol
7022 unsigned long st_name; /* Symbol name, index in string tbl */
7023 unsigned char st_info; /* Type and binding attributes */
7024 unsigned char st_other; /* Visibilty, and target specific */
7027 struct elf_symbuf_head
7029 struct elf_symbuf_symbol *ssym;
7030 bfd_size_type count;
7031 unsigned int st_shndx;
7038 Elf_Internal_Sym *isym;
7039 struct elf_symbuf_symbol *ssym;
7044 /* Sort references to symbols by ascending section number. */
7047 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7049 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7050 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7052 return s1->st_shndx - s2->st_shndx;
7056 elf_sym_name_compare (const void *arg1, const void *arg2)
7058 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7059 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7060 return strcmp (s1->name, s2->name);
7063 static struct elf_symbuf_head *
7064 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7066 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7067 struct elf_symbuf_symbol *ssym;
7068 struct elf_symbuf_head *ssymbuf, *ssymhead;
7069 bfd_size_type i, shndx_count, total_size;
7071 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7075 for (ind = indbuf, i = 0; i < symcount; i++)
7076 if (isymbuf[i].st_shndx != SHN_UNDEF)
7077 *ind++ = &isymbuf[i];
7080 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7081 elf_sort_elf_symbol);
7084 if (indbufend > indbuf)
7085 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7086 if (ind[0]->st_shndx != ind[1]->st_shndx)
7089 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7090 + (indbufend - indbuf) * sizeof (*ssym));
7091 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7092 if (ssymbuf == NULL)
7098 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7099 ssymbuf->ssym = NULL;
7100 ssymbuf->count = shndx_count;
7101 ssymbuf->st_shndx = 0;
7102 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7104 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7107 ssymhead->ssym = ssym;
7108 ssymhead->count = 0;
7109 ssymhead->st_shndx = (*ind)->st_shndx;
7111 ssym->st_name = (*ind)->st_name;
7112 ssym->st_info = (*ind)->st_info;
7113 ssym->st_other = (*ind)->st_other;
7116 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7117 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7124 /* Check if 2 sections define the same set of local and global
7128 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7129 struct bfd_link_info *info)
7132 const struct elf_backend_data *bed1, *bed2;
7133 Elf_Internal_Shdr *hdr1, *hdr2;
7134 bfd_size_type symcount1, symcount2;
7135 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7136 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7137 Elf_Internal_Sym *isym, *isymend;
7138 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7139 bfd_size_type count1, count2, i;
7140 unsigned int shndx1, shndx2;
7146 /* Both sections have to be in ELF. */
7147 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7148 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7151 if (elf_section_type (sec1) != elf_section_type (sec2))
7154 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7155 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7156 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7159 bed1 = get_elf_backend_data (bfd1);
7160 bed2 = get_elf_backend_data (bfd2);
7161 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7162 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7163 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7164 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7166 if (symcount1 == 0 || symcount2 == 0)
7172 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7173 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7175 if (ssymbuf1 == NULL)
7177 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7179 if (isymbuf1 == NULL)
7182 if (!info->reduce_memory_overheads)
7183 elf_tdata (bfd1)->symbuf = ssymbuf1
7184 = elf_create_symbuf (symcount1, isymbuf1);
7187 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7189 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7191 if (isymbuf2 == NULL)
7194 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7195 elf_tdata (bfd2)->symbuf = ssymbuf2
7196 = elf_create_symbuf (symcount2, isymbuf2);
7199 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7201 /* Optimized faster version. */
7202 bfd_size_type lo, hi, mid;
7203 struct elf_symbol *symp;
7204 struct elf_symbuf_symbol *ssym, *ssymend;
7207 hi = ssymbuf1->count;
7212 mid = (lo + hi) / 2;
7213 if (shndx1 < ssymbuf1[mid].st_shndx)
7215 else if (shndx1 > ssymbuf1[mid].st_shndx)
7219 count1 = ssymbuf1[mid].count;
7226 hi = ssymbuf2->count;
7231 mid = (lo + hi) / 2;
7232 if (shndx2 < ssymbuf2[mid].st_shndx)
7234 else if (shndx2 > ssymbuf2[mid].st_shndx)
7238 count2 = ssymbuf2[mid].count;
7244 if (count1 == 0 || count2 == 0 || count1 != count2)
7247 symtable1 = (struct elf_symbol *)
7248 bfd_malloc (count1 * sizeof (struct elf_symbol));
7249 symtable2 = (struct elf_symbol *)
7250 bfd_malloc (count2 * sizeof (struct elf_symbol));
7251 if (symtable1 == NULL || symtable2 == NULL)
7255 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7256 ssym < ssymend; ssym++, symp++)
7258 symp->u.ssym = ssym;
7259 symp->name = bfd_elf_string_from_elf_section (bfd1,
7265 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7266 ssym < ssymend; ssym++, symp++)
7268 symp->u.ssym = ssym;
7269 symp->name = bfd_elf_string_from_elf_section (bfd2,
7274 /* Sort symbol by name. */
7275 qsort (symtable1, count1, sizeof (struct elf_symbol),
7276 elf_sym_name_compare);
7277 qsort (symtable2, count1, sizeof (struct elf_symbol),
7278 elf_sym_name_compare);
7280 for (i = 0; i < count1; i++)
7281 /* Two symbols must have the same binding, type and name. */
7282 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7283 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7284 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7291 symtable1 = (struct elf_symbol *)
7292 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7293 symtable2 = (struct elf_symbol *)
7294 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7295 if (symtable1 == NULL || symtable2 == NULL)
7298 /* Count definitions in the section. */
7300 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7301 if (isym->st_shndx == shndx1)
7302 symtable1[count1++].u.isym = isym;
7305 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7306 if (isym->st_shndx == shndx2)
7307 symtable2[count2++].u.isym = isym;
7309 if (count1 == 0 || count2 == 0 || count1 != count2)
7312 for (i = 0; i < count1; i++)
7314 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7315 symtable1[i].u.isym->st_name);
7317 for (i = 0; i < count2; i++)
7319 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7320 symtable2[i].u.isym->st_name);
7322 /* Sort symbol by name. */
7323 qsort (symtable1, count1, sizeof (struct elf_symbol),
7324 elf_sym_name_compare);
7325 qsort (symtable2, count1, sizeof (struct elf_symbol),
7326 elf_sym_name_compare);
7328 for (i = 0; i < count1; i++)
7329 /* Two symbols must have the same binding, type and name. */
7330 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7331 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7332 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7350 /* Return TRUE if 2 section types are compatible. */
7353 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7354 bfd *bbfd, const asection *bsec)
7358 || abfd->xvec->flavour != bfd_target_elf_flavour
7359 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7362 return elf_section_type (asec) == elf_section_type (bsec);
7365 /* Final phase of ELF linker. */
7367 /* A structure we use to avoid passing large numbers of arguments. */
7369 struct elf_final_link_info
7371 /* General link information. */
7372 struct bfd_link_info *info;
7375 /* Symbol string table. */
7376 struct bfd_strtab_hash *symstrtab;
7377 /* .dynsym section. */
7378 asection *dynsym_sec;
7379 /* .hash section. */
7381 /* symbol version section (.gnu.version). */
7382 asection *symver_sec;
7383 /* Buffer large enough to hold contents of any section. */
7385 /* Buffer large enough to hold external relocs of any section. */
7386 void *external_relocs;
7387 /* Buffer large enough to hold internal relocs of any section. */
7388 Elf_Internal_Rela *internal_relocs;
7389 /* Buffer large enough to hold external local symbols of any input
7391 bfd_byte *external_syms;
7392 /* And a buffer for symbol section indices. */
7393 Elf_External_Sym_Shndx *locsym_shndx;
7394 /* Buffer large enough to hold internal local symbols of any input
7396 Elf_Internal_Sym *internal_syms;
7397 /* Array large enough to hold a symbol index for each local symbol
7398 of any input BFD. */
7400 /* Array large enough to hold a section pointer for each local
7401 symbol of any input BFD. */
7402 asection **sections;
7403 /* Buffer to hold swapped out symbols. */
7405 /* And one for symbol section indices. */
7406 Elf_External_Sym_Shndx *symshndxbuf;
7407 /* Number of swapped out symbols in buffer. */
7408 size_t symbuf_count;
7409 /* Number of symbols which fit in symbuf. */
7411 /* And same for symshndxbuf. */
7412 size_t shndxbuf_size;
7415 /* This struct is used to pass information to elf_link_output_extsym. */
7417 struct elf_outext_info
7420 bfd_boolean localsyms;
7421 struct elf_final_link_info *finfo;
7425 /* Support for evaluating a complex relocation.
7427 Complex relocations are generalized, self-describing relocations. The
7428 implementation of them consists of two parts: complex symbols, and the
7429 relocations themselves.
7431 The relocations are use a reserved elf-wide relocation type code (R_RELC
7432 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7433 information (start bit, end bit, word width, etc) into the addend. This
7434 information is extracted from CGEN-generated operand tables within gas.
7436 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7437 internal) representing prefix-notation expressions, including but not
7438 limited to those sorts of expressions normally encoded as addends in the
7439 addend field. The symbol mangling format is:
7442 | <unary-operator> ':' <node>
7443 | <binary-operator> ':' <node> ':' <node>
7446 <literal> := 's' <digits=N> ':' <N character symbol name>
7447 | 'S' <digits=N> ':' <N character section name>
7451 <binary-operator> := as in C
7452 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7455 set_symbol_value (bfd *bfd_with_globals,
7456 Elf_Internal_Sym *isymbuf,
7461 struct elf_link_hash_entry **sym_hashes;
7462 struct elf_link_hash_entry *h;
7463 size_t extsymoff = locsymcount;
7465 if (symidx < locsymcount)
7467 Elf_Internal_Sym *sym;
7469 sym = isymbuf + symidx;
7470 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7472 /* It is a local symbol: move it to the
7473 "absolute" section and give it a value. */
7474 sym->st_shndx = SHN_ABS;
7475 sym->st_value = val;
7478 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7482 /* It is a global symbol: set its link type
7483 to "defined" and give it a value. */
7485 sym_hashes = elf_sym_hashes (bfd_with_globals);
7486 h = sym_hashes [symidx - extsymoff];
7487 while (h->root.type == bfd_link_hash_indirect
7488 || h->root.type == bfd_link_hash_warning)
7489 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7490 h->root.type = bfd_link_hash_defined;
7491 h->root.u.def.value = val;
7492 h->root.u.def.section = bfd_abs_section_ptr;
7496 resolve_symbol (const char *name,
7498 struct elf_final_link_info *finfo,
7500 Elf_Internal_Sym *isymbuf,
7503 Elf_Internal_Sym *sym;
7504 struct bfd_link_hash_entry *global_entry;
7505 const char *candidate = NULL;
7506 Elf_Internal_Shdr *symtab_hdr;
7509 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7511 for (i = 0; i < locsymcount; ++ i)
7515 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7518 candidate = bfd_elf_string_from_elf_section (input_bfd,
7519 symtab_hdr->sh_link,
7522 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7523 name, candidate, (unsigned long) sym->st_value);
7525 if (candidate && strcmp (candidate, name) == 0)
7527 asection *sec = finfo->sections [i];
7529 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7530 *result += sec->output_offset + sec->output_section->vma;
7532 printf ("Found symbol with value %8.8lx\n",
7533 (unsigned long) *result);
7539 /* Hmm, haven't found it yet. perhaps it is a global. */
7540 global_entry = bfd_link_hash_lookup (finfo->info->hash, name,
7541 FALSE, FALSE, TRUE);
7545 if (global_entry->type == bfd_link_hash_defined
7546 || global_entry->type == bfd_link_hash_defweak)
7548 *result = (global_entry->u.def.value
7549 + global_entry->u.def.section->output_section->vma
7550 + global_entry->u.def.section->output_offset);
7552 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7553 global_entry->root.string, (unsigned long) *result);
7562 resolve_section (const char *name,
7569 for (curr = sections; curr; curr = curr->next)
7570 if (strcmp (curr->name, name) == 0)
7572 *result = curr->vma;
7576 /* Hmm. still haven't found it. try pseudo-section names. */
7577 for (curr = sections; curr; curr = curr->next)
7579 len = strlen (curr->name);
7580 if (len > strlen (name))
7583 if (strncmp (curr->name, name, len) == 0)
7585 if (strncmp (".end", name + len, 4) == 0)
7587 *result = curr->vma + curr->size;
7591 /* Insert more pseudo-section names here, if you like. */
7599 undefined_reference (const char *reftype, const char *name)
7601 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7606 eval_symbol (bfd_vma *result,
7609 struct elf_final_link_info *finfo,
7611 Elf_Internal_Sym *isymbuf,
7620 const char *sym = *symp;
7622 bfd_boolean symbol_is_section = FALSE;
7627 if (len < 1 || len > sizeof (symbuf))
7629 bfd_set_error (bfd_error_invalid_operation);
7642 *result = strtoul (sym, (char **) symp, 16);
7646 symbol_is_section = TRUE;
7649 symlen = strtol (sym, (char **) symp, 10);
7650 sym = *symp + 1; /* Skip the trailing ':'. */
7652 if (symend < sym || symlen + 1 > sizeof (symbuf))
7654 bfd_set_error (bfd_error_invalid_operation);
7658 memcpy (symbuf, sym, symlen);
7659 symbuf[symlen] = '\0';
7660 *symp = sym + symlen;
7662 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7663 the symbol as a section, or vice-versa. so we're pretty liberal in our
7664 interpretation here; section means "try section first", not "must be a
7665 section", and likewise with symbol. */
7667 if (symbol_is_section)
7669 if (!resolve_section (symbuf, finfo->output_bfd->sections, result)
7670 && !resolve_symbol (symbuf, input_bfd, finfo, result,
7671 isymbuf, locsymcount))
7673 undefined_reference ("section", symbuf);
7679 if (!resolve_symbol (symbuf, input_bfd, finfo, result,
7680 isymbuf, locsymcount)
7681 && !resolve_section (symbuf, finfo->output_bfd->sections,
7684 undefined_reference ("symbol", symbuf);
7691 /* All that remains are operators. */
7693 #define UNARY_OP(op) \
7694 if (strncmp (sym, #op, strlen (#op)) == 0) \
7696 sym += strlen (#op); \
7700 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7701 isymbuf, locsymcount, signed_p)) \
7704 *result = op ((bfd_signed_vma) a); \
7710 #define BINARY_OP(op) \
7711 if (strncmp (sym, #op, strlen (#op)) == 0) \
7713 sym += strlen (#op); \
7717 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7718 isymbuf, locsymcount, signed_p)) \
7721 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7722 isymbuf, locsymcount, signed_p)) \
7725 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7755 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7756 bfd_set_error (bfd_error_invalid_operation);
7762 put_value (bfd_vma size,
7763 unsigned long chunksz,
7768 location += (size - chunksz);
7770 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7778 bfd_put_8 (input_bfd, x, location);
7781 bfd_put_16 (input_bfd, x, location);
7784 bfd_put_32 (input_bfd, x, location);
7788 bfd_put_64 (input_bfd, x, location);
7798 get_value (bfd_vma size,
7799 unsigned long chunksz,
7805 for (; size; size -= chunksz, location += chunksz)
7813 x = (x << (8 * chunksz)) | bfd_get_8 (input_bfd, location);
7816 x = (x << (8 * chunksz)) | bfd_get_16 (input_bfd, location);
7819 x = (x << (8 * chunksz)) | bfd_get_32 (input_bfd, location);
7823 x = (x << (8 * chunksz)) | bfd_get_64 (input_bfd, location);
7834 decode_complex_addend (unsigned long *start, /* in bits */
7835 unsigned long *oplen, /* in bits */
7836 unsigned long *len, /* in bits */
7837 unsigned long *wordsz, /* in bytes */
7838 unsigned long *chunksz, /* in bytes */
7839 unsigned long *lsb0_p,
7840 unsigned long *signed_p,
7841 unsigned long *trunc_p,
7842 unsigned long encoded)
7844 * start = encoded & 0x3F;
7845 * len = (encoded >> 6) & 0x3F;
7846 * oplen = (encoded >> 12) & 0x3F;
7847 * wordsz = (encoded >> 18) & 0xF;
7848 * chunksz = (encoded >> 22) & 0xF;
7849 * lsb0_p = (encoded >> 27) & 1;
7850 * signed_p = (encoded >> 28) & 1;
7851 * trunc_p = (encoded >> 29) & 1;
7854 bfd_reloc_status_type
7855 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7856 asection *input_section ATTRIBUTE_UNUSED,
7858 Elf_Internal_Rela *rel,
7861 bfd_vma shift, x, mask;
7862 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7863 bfd_reloc_status_type r;
7865 /* Perform this reloc, since it is complex.
7866 (this is not to say that it necessarily refers to a complex
7867 symbol; merely that it is a self-describing CGEN based reloc.
7868 i.e. the addend has the complete reloc information (bit start, end,
7869 word size, etc) encoded within it.). */
7871 decode_complex_addend (&start, &oplen, &len, &wordsz,
7872 &chunksz, &lsb0_p, &signed_p,
7873 &trunc_p, rel->r_addend);
7875 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7878 shift = (start + 1) - len;
7880 shift = (8 * wordsz) - (start + len);
7882 /* FIXME: octets_per_byte. */
7883 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7886 printf ("Doing complex reloc: "
7887 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7888 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7889 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7890 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7891 oplen, x, mask, relocation);
7896 /* Now do an overflow check. */
7897 r = bfd_check_overflow ((signed_p
7898 ? complain_overflow_signed
7899 : complain_overflow_unsigned),
7900 len, 0, (8 * wordsz),
7904 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7907 printf (" relocation: %8.8lx\n"
7908 " shifted mask: %8.8lx\n"
7909 " shifted/masked reloc: %8.8lx\n"
7910 " result: %8.8lx\n",
7911 relocation, (mask << shift),
7912 ((relocation & mask) << shift), x);
7914 /* FIXME: octets_per_byte. */
7915 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7919 /* When performing a relocatable link, the input relocations are
7920 preserved. But, if they reference global symbols, the indices
7921 referenced must be updated. Update all the relocations in
7922 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
7925 elf_link_adjust_relocs (bfd *abfd,
7926 Elf_Internal_Shdr *rel_hdr,
7928 struct elf_link_hash_entry **rel_hash)
7931 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7933 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7934 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7935 bfd_vma r_type_mask;
7938 if (rel_hdr->sh_entsize == bed->s->sizeof_rel)
7940 swap_in = bed->s->swap_reloc_in;
7941 swap_out = bed->s->swap_reloc_out;
7943 else if (rel_hdr->sh_entsize == bed->s->sizeof_rela)
7945 swap_in = bed->s->swap_reloca_in;
7946 swap_out = bed->s->swap_reloca_out;
7951 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
7954 if (bed->s->arch_size == 32)
7961 r_type_mask = 0xffffffff;
7965 erela = rel_hdr->contents;
7966 for (i = 0; i < count; i++, rel_hash++, erela += rel_hdr->sh_entsize)
7968 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
7971 if (*rel_hash == NULL)
7974 BFD_ASSERT ((*rel_hash)->indx >= 0);
7976 (*swap_in) (abfd, erela, irela);
7977 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
7978 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
7979 | (irela[j].r_info & r_type_mask));
7980 (*swap_out) (abfd, irela, erela);
7984 struct elf_link_sort_rela
7990 enum elf_reloc_type_class type;
7991 /* We use this as an array of size int_rels_per_ext_rel. */
7992 Elf_Internal_Rela rela[1];
7996 elf_link_sort_cmp1 (const void *A, const void *B)
7998 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
7999 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8000 int relativea, relativeb;
8002 relativea = a->type == reloc_class_relative;
8003 relativeb = b->type == reloc_class_relative;
8005 if (relativea < relativeb)
8007 if (relativea > relativeb)
8009 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8011 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8013 if (a->rela->r_offset < b->rela->r_offset)
8015 if (a->rela->r_offset > b->rela->r_offset)
8021 elf_link_sort_cmp2 (const void *A, const void *B)
8023 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8024 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8027 if (a->u.offset < b->u.offset)
8029 if (a->u.offset > b->u.offset)
8031 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
8032 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
8037 if (a->rela->r_offset < b->rela->r_offset)
8039 if (a->rela->r_offset > b->rela->r_offset)
8045 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8047 asection *dynamic_relocs;
8050 bfd_size_type count, size;
8051 size_t i, ret, sort_elt, ext_size;
8052 bfd_byte *sort, *s_non_relative, *p;
8053 struct elf_link_sort_rela *sq;
8054 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8055 int i2e = bed->s->int_rels_per_ext_rel;
8056 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8057 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8058 struct bfd_link_order *lo;
8060 bfd_boolean use_rela;
8062 /* Find a dynamic reloc section. */
8063 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8064 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8065 if (rela_dyn != NULL && rela_dyn->size > 0
8066 && rel_dyn != NULL && rel_dyn->size > 0)
8068 bfd_boolean use_rela_initialised = FALSE;
8070 /* This is just here to stop gcc from complaining.
8071 It's initialization checking code is not perfect. */
8074 /* Both sections are present. Examine the sizes
8075 of the indirect sections to help us choose. */
8076 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8077 if (lo->type == bfd_indirect_link_order)
8079 asection *o = lo->u.indirect.section;
8081 if ((o->size % bed->s->sizeof_rela) == 0)
8083 if ((o->size % bed->s->sizeof_rel) == 0)
8084 /* Section size is divisible by both rel and rela sizes.
8085 It is of no help to us. */
8089 /* Section size is only divisible by rela. */
8090 if (use_rela_initialised && (use_rela == FALSE))
8093 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8094 bfd_set_error (bfd_error_invalid_operation);
8100 use_rela_initialised = TRUE;
8104 else if ((o->size % bed->s->sizeof_rel) == 0)
8106 /* Section size is only divisible by rel. */
8107 if (use_rela_initialised && (use_rela == TRUE))
8110 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8111 bfd_set_error (bfd_error_invalid_operation);
8117 use_rela_initialised = TRUE;
8122 /* The section size is not divisible by either - something is wrong. */
8124 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8125 bfd_set_error (bfd_error_invalid_operation);
8130 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8131 if (lo->type == bfd_indirect_link_order)
8133 asection *o = lo->u.indirect.section;
8135 if ((o->size % bed->s->sizeof_rela) == 0)
8137 if ((o->size % bed->s->sizeof_rel) == 0)
8138 /* Section size is divisible by both rel and rela sizes.
8139 It is of no help to us. */
8143 /* Section size is only divisible by rela. */
8144 if (use_rela_initialised && (use_rela == FALSE))
8147 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8148 bfd_set_error (bfd_error_invalid_operation);
8154 use_rela_initialised = TRUE;
8158 else if ((o->size % bed->s->sizeof_rel) == 0)
8160 /* Section size is only divisible by rel. */
8161 if (use_rela_initialised && (use_rela == TRUE))
8164 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8165 bfd_set_error (bfd_error_invalid_operation);
8171 use_rela_initialised = TRUE;
8176 /* The section size is not divisible by either - something is wrong. */
8178 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8179 bfd_set_error (bfd_error_invalid_operation);
8184 if (! use_rela_initialised)
8188 else if (rela_dyn != NULL && rela_dyn->size > 0)
8190 else if (rel_dyn != NULL && rel_dyn->size > 0)
8197 dynamic_relocs = rela_dyn;
8198 ext_size = bed->s->sizeof_rela;
8199 swap_in = bed->s->swap_reloca_in;
8200 swap_out = bed->s->swap_reloca_out;
8204 dynamic_relocs = rel_dyn;
8205 ext_size = bed->s->sizeof_rel;
8206 swap_in = bed->s->swap_reloc_in;
8207 swap_out = bed->s->swap_reloc_out;
8211 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8212 if (lo->type == bfd_indirect_link_order)
8213 size += lo->u.indirect.section->size;
8215 if (size != dynamic_relocs->size)
8218 sort_elt = (sizeof (struct elf_link_sort_rela)
8219 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8221 count = dynamic_relocs->size / ext_size;
8224 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8228 (*info->callbacks->warning)
8229 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8233 if (bed->s->arch_size == 32)
8234 r_sym_mask = ~(bfd_vma) 0xff;
8236 r_sym_mask = ~(bfd_vma) 0xffffffff;
8238 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8239 if (lo->type == bfd_indirect_link_order)
8241 bfd_byte *erel, *erelend;
8242 asection *o = lo->u.indirect.section;
8244 if (o->contents == NULL && o->size != 0)
8246 /* This is a reloc section that is being handled as a normal
8247 section. See bfd_section_from_shdr. We can't combine
8248 relocs in this case. */
8253 erelend = o->contents + o->size;
8254 /* FIXME: octets_per_byte. */
8255 p = sort + o->output_offset / ext_size * sort_elt;
8257 while (erel < erelend)
8259 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8261 (*swap_in) (abfd, erel, s->rela);
8262 s->type = (*bed->elf_backend_reloc_type_class) (s->rela);
8263 s->u.sym_mask = r_sym_mask;
8269 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8271 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8273 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8274 if (s->type != reloc_class_relative)
8280 sq = (struct elf_link_sort_rela *) s_non_relative;
8281 for (; i < count; i++, p += sort_elt)
8283 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8284 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8286 sp->u.offset = sq->rela->r_offset;
8289 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8291 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8292 if (lo->type == bfd_indirect_link_order)
8294 bfd_byte *erel, *erelend;
8295 asection *o = lo->u.indirect.section;
8298 erelend = o->contents + o->size;
8299 /* FIXME: octets_per_byte. */
8300 p = sort + o->output_offset / ext_size * sort_elt;
8301 while (erel < erelend)
8303 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8304 (*swap_out) (abfd, s->rela, erel);
8311 *psec = dynamic_relocs;
8315 /* Flush the output symbols to the file. */
8318 elf_link_flush_output_syms (struct elf_final_link_info *finfo,
8319 const struct elf_backend_data *bed)
8321 if (finfo->symbuf_count > 0)
8323 Elf_Internal_Shdr *hdr;
8327 hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
8328 pos = hdr->sh_offset + hdr->sh_size;
8329 amt = finfo->symbuf_count * bed->s->sizeof_sym;
8330 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
8331 || bfd_bwrite (finfo->symbuf, amt, finfo->output_bfd) != amt)
8334 hdr->sh_size += amt;
8335 finfo->symbuf_count = 0;
8341 /* Add a symbol to the output symbol table. */
8344 elf_link_output_sym (struct elf_final_link_info *finfo,
8346 Elf_Internal_Sym *elfsym,
8347 asection *input_sec,
8348 struct elf_link_hash_entry *h)
8351 Elf_External_Sym_Shndx *destshndx;
8352 int (*output_symbol_hook)
8353 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8354 struct elf_link_hash_entry *);
8355 const struct elf_backend_data *bed;
8357 bed = get_elf_backend_data (finfo->output_bfd);
8358 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8359 if (output_symbol_hook != NULL)
8361 int ret = (*output_symbol_hook) (finfo->info, name, elfsym, input_sec, h);
8366 if (name == NULL || *name == '\0')
8367 elfsym->st_name = 0;
8368 else if (input_sec->flags & SEC_EXCLUDE)
8369 elfsym->st_name = 0;
8372 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
8374 if (elfsym->st_name == (unsigned long) -1)
8378 if (finfo->symbuf_count >= finfo->symbuf_size)
8380 if (! elf_link_flush_output_syms (finfo, bed))
8384 dest = finfo->symbuf + finfo->symbuf_count * bed->s->sizeof_sym;
8385 destshndx = finfo->symshndxbuf;
8386 if (destshndx != NULL)
8388 if (bfd_get_symcount (finfo->output_bfd) >= finfo->shndxbuf_size)
8392 amt = finfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8393 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8395 if (destshndx == NULL)
8397 finfo->symshndxbuf = destshndx;
8398 memset ((char *) destshndx + amt, 0, amt);
8399 finfo->shndxbuf_size *= 2;
8401 destshndx += bfd_get_symcount (finfo->output_bfd);
8404 bed->s->swap_symbol_out (finfo->output_bfd, elfsym, dest, destshndx);
8405 finfo->symbuf_count += 1;
8406 bfd_get_symcount (finfo->output_bfd) += 1;
8411 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8414 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8416 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8417 && sym->st_shndx < SHN_LORESERVE)
8419 /* The gABI doesn't support dynamic symbols in output sections
8421 (*_bfd_error_handler)
8422 (_("%B: Too many sections: %d (>= %d)"),
8423 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8424 bfd_set_error (bfd_error_nonrepresentable_section);
8430 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8431 allowing an unsatisfied unversioned symbol in the DSO to match a
8432 versioned symbol that would normally require an explicit version.
8433 We also handle the case that a DSO references a hidden symbol
8434 which may be satisfied by a versioned symbol in another DSO. */
8437 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8438 const struct elf_backend_data *bed,
8439 struct elf_link_hash_entry *h)
8442 struct elf_link_loaded_list *loaded;
8444 if (!is_elf_hash_table (info->hash))
8447 switch (h->root.type)
8453 case bfd_link_hash_undefined:
8454 case bfd_link_hash_undefweak:
8455 abfd = h->root.u.undef.abfd;
8456 if ((abfd->flags & DYNAMIC) == 0
8457 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8461 case bfd_link_hash_defined:
8462 case bfd_link_hash_defweak:
8463 abfd = h->root.u.def.section->owner;
8466 case bfd_link_hash_common:
8467 abfd = h->root.u.c.p->section->owner;
8470 BFD_ASSERT (abfd != NULL);
8472 for (loaded = elf_hash_table (info)->loaded;
8474 loaded = loaded->next)
8477 Elf_Internal_Shdr *hdr;
8478 bfd_size_type symcount;
8479 bfd_size_type extsymcount;
8480 bfd_size_type extsymoff;
8481 Elf_Internal_Shdr *versymhdr;
8482 Elf_Internal_Sym *isym;
8483 Elf_Internal_Sym *isymend;
8484 Elf_Internal_Sym *isymbuf;
8485 Elf_External_Versym *ever;
8486 Elf_External_Versym *extversym;
8488 input = loaded->abfd;
8490 /* We check each DSO for a possible hidden versioned definition. */
8492 || (input->flags & DYNAMIC) == 0
8493 || elf_dynversym (input) == 0)
8496 hdr = &elf_tdata (input)->dynsymtab_hdr;
8498 symcount = hdr->sh_size / bed->s->sizeof_sym;
8499 if (elf_bad_symtab (input))
8501 extsymcount = symcount;
8506 extsymcount = symcount - hdr->sh_info;
8507 extsymoff = hdr->sh_info;
8510 if (extsymcount == 0)
8513 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8515 if (isymbuf == NULL)
8518 /* Read in any version definitions. */
8519 versymhdr = &elf_tdata (input)->dynversym_hdr;
8520 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8521 if (extversym == NULL)
8524 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8525 || (bfd_bread (extversym, versymhdr->sh_size, input)
8526 != versymhdr->sh_size))
8534 ever = extversym + extsymoff;
8535 isymend = isymbuf + extsymcount;
8536 for (isym = isymbuf; isym < isymend; isym++, ever++)
8539 Elf_Internal_Versym iver;
8540 unsigned short version_index;
8542 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8543 || isym->st_shndx == SHN_UNDEF)
8546 name = bfd_elf_string_from_elf_section (input,
8549 if (strcmp (name, h->root.root.string) != 0)
8552 _bfd_elf_swap_versym_in (input, ever, &iver);
8554 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8556 && h->forced_local))
8558 /* If we have a non-hidden versioned sym, then it should
8559 have provided a definition for the undefined sym unless
8560 it is defined in a non-shared object and forced local.
8565 version_index = iver.vs_vers & VERSYM_VERSION;
8566 if (version_index == 1 || version_index == 2)
8568 /* This is the base or first version. We can use it. */
8582 /* Add an external symbol to the symbol table. This is called from
8583 the hash table traversal routine. When generating a shared object,
8584 we go through the symbol table twice. The first time we output
8585 anything that might have been forced to local scope in a version
8586 script. The second time we output the symbols that are still
8590 elf_link_output_extsym (struct elf_link_hash_entry *h, void *data)
8592 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8593 struct elf_final_link_info *finfo = eoinfo->finfo;
8595 Elf_Internal_Sym sym;
8596 asection *input_sec;
8597 const struct elf_backend_data *bed;
8601 if (h->root.type == bfd_link_hash_warning)
8603 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8604 if (h->root.type == bfd_link_hash_new)
8608 /* Decide whether to output this symbol in this pass. */
8609 if (eoinfo->localsyms)
8611 if (!h->forced_local)
8616 if (h->forced_local)
8620 bed = get_elf_backend_data (finfo->output_bfd);
8622 if (h->root.type == bfd_link_hash_undefined)
8624 /* If we have an undefined symbol reference here then it must have
8625 come from a shared library that is being linked in. (Undefined
8626 references in regular files have already been handled unless
8627 they are in unreferenced sections which are removed by garbage
8629 bfd_boolean ignore_undef = FALSE;
8631 /* Some symbols may be special in that the fact that they're
8632 undefined can be safely ignored - let backend determine that. */
8633 if (bed->elf_backend_ignore_undef_symbol)
8634 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8636 /* If we are reporting errors for this situation then do so now. */
8637 if (ignore_undef == FALSE
8639 && (!h->ref_regular || finfo->info->gc_sections)
8640 && ! elf_link_check_versioned_symbol (finfo->info, bed, h)
8641 && finfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8643 if (! (finfo->info->callbacks->undefined_symbol
8644 (finfo->info, h->root.root.string,
8645 h->ref_regular ? NULL : h->root.u.undef.abfd,
8646 NULL, 0, finfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR)))
8648 eoinfo->failed = TRUE;
8654 /* We should also warn if a forced local symbol is referenced from
8655 shared libraries. */
8656 if (! finfo->info->relocatable
8657 && (! finfo->info->shared)
8662 && ! elf_link_check_versioned_symbol (finfo->info, bed, h))
8664 (*_bfd_error_handler)
8665 (_("%B: %s symbol `%s' in %B is referenced by DSO"),
8667 h->root.u.def.section == bfd_abs_section_ptr
8668 ? finfo->output_bfd : h->root.u.def.section->owner,
8669 ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
8671 : ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
8672 ? "hidden" : "local",
8673 h->root.root.string);
8674 eoinfo->failed = TRUE;
8678 /* We don't want to output symbols that have never been mentioned by
8679 a regular file, or that we have been told to strip. However, if
8680 h->indx is set to -2, the symbol is used by a reloc and we must
8684 else if ((h->def_dynamic
8686 || h->root.type == bfd_link_hash_new)
8690 else if (finfo->info->strip == strip_all)
8692 else if (finfo->info->strip == strip_some
8693 && bfd_hash_lookup (finfo->info->keep_hash,
8694 h->root.root.string, FALSE, FALSE) == NULL)
8696 else if (finfo->info->strip_discarded
8697 && (h->root.type == bfd_link_hash_defined
8698 || h->root.type == bfd_link_hash_defweak)
8699 && elf_discarded_section (h->root.u.def.section))
8704 /* If we're stripping it, and it's not a dynamic symbol, there's
8705 nothing else to do unless it is a forced local symbol or a
8706 STT_GNU_IFUNC symbol. */
8709 && h->type != STT_GNU_IFUNC
8710 && !h->forced_local)
8714 sym.st_size = h->size;
8715 sym.st_other = h->other;
8716 if (h->forced_local)
8718 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8719 /* Turn off visibility on local symbol. */
8720 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8722 else if (h->unique_global)
8723 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8724 else if (h->root.type == bfd_link_hash_undefweak
8725 || h->root.type == bfd_link_hash_defweak)
8726 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8728 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8730 switch (h->root.type)
8733 case bfd_link_hash_new:
8734 case bfd_link_hash_warning:
8738 case bfd_link_hash_undefined:
8739 case bfd_link_hash_undefweak:
8740 input_sec = bfd_und_section_ptr;
8741 sym.st_shndx = SHN_UNDEF;
8744 case bfd_link_hash_defined:
8745 case bfd_link_hash_defweak:
8747 input_sec = h->root.u.def.section;
8748 if (input_sec->output_section != NULL)
8751 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
8752 input_sec->output_section);
8753 if (sym.st_shndx == SHN_BAD)
8755 (*_bfd_error_handler)
8756 (_("%B: could not find output section %A for input section %A"),
8757 finfo->output_bfd, input_sec->output_section, input_sec);
8758 eoinfo->failed = TRUE;
8762 /* ELF symbols in relocatable files are section relative,
8763 but in nonrelocatable files they are virtual
8765 sym.st_value = h->root.u.def.value + input_sec->output_offset;
8766 if (! finfo->info->relocatable)
8768 sym.st_value += input_sec->output_section->vma;
8769 if (h->type == STT_TLS)
8771 asection *tls_sec = elf_hash_table (finfo->info)->tls_sec;
8772 if (tls_sec != NULL)
8773 sym.st_value -= tls_sec->vma;
8776 /* The TLS section may have been garbage collected. */
8777 BFD_ASSERT (finfo->info->gc_sections
8778 && !input_sec->gc_mark);
8785 BFD_ASSERT (input_sec->owner == NULL
8786 || (input_sec->owner->flags & DYNAMIC) != 0);
8787 sym.st_shndx = SHN_UNDEF;
8788 input_sec = bfd_und_section_ptr;
8793 case bfd_link_hash_common:
8794 input_sec = h->root.u.c.p->section;
8795 sym.st_shndx = bed->common_section_index (input_sec);
8796 sym.st_value = 1 << h->root.u.c.p->alignment_power;
8799 case bfd_link_hash_indirect:
8800 /* These symbols are created by symbol versioning. They point
8801 to the decorated version of the name. For example, if the
8802 symbol foo@@GNU_1.2 is the default, which should be used when
8803 foo is used with no version, then we add an indirect symbol
8804 foo which points to foo@@GNU_1.2. We ignore these symbols,
8805 since the indirected symbol is already in the hash table. */
8809 /* Give the processor backend a chance to tweak the symbol value,
8810 and also to finish up anything that needs to be done for this
8811 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8812 forced local syms when non-shared is due to a historical quirk.
8813 STT_GNU_IFUNC symbol must go through PLT. */
8814 if ((h->type == STT_GNU_IFUNC
8816 && !finfo->info->relocatable)
8817 || ((h->dynindx != -1
8819 && ((finfo->info->shared
8820 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
8821 || h->root.type != bfd_link_hash_undefweak))
8822 || !h->forced_local)
8823 && elf_hash_table (finfo->info)->dynamic_sections_created))
8825 if (! ((*bed->elf_backend_finish_dynamic_symbol)
8826 (finfo->output_bfd, finfo->info, h, &sym)))
8828 eoinfo->failed = TRUE;
8833 /* If we are marking the symbol as undefined, and there are no
8834 non-weak references to this symbol from a regular object, then
8835 mark the symbol as weak undefined; if there are non-weak
8836 references, mark the symbol as strong. We can't do this earlier,
8837 because it might not be marked as undefined until the
8838 finish_dynamic_symbol routine gets through with it. */
8839 if (sym.st_shndx == SHN_UNDEF
8841 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
8842 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
8845 unsigned int type = ELF_ST_TYPE (sym.st_info);
8847 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8848 if (type == STT_GNU_IFUNC)
8851 if (h->ref_regular_nonweak)
8852 bindtype = STB_GLOBAL;
8854 bindtype = STB_WEAK;
8855 sym.st_info = ELF_ST_INFO (bindtype, type);
8858 /* If this is a symbol defined in a dynamic library, don't use the
8859 symbol size from the dynamic library. Relinking an executable
8860 against a new library may introduce gratuitous changes in the
8861 executable's symbols if we keep the size. */
8862 if (sym.st_shndx == SHN_UNDEF
8867 /* If a non-weak symbol with non-default visibility is not defined
8868 locally, it is a fatal error. */
8869 if (! finfo->info->relocatable
8870 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
8871 && ELF_ST_BIND (sym.st_info) != STB_WEAK
8872 && h->root.type == bfd_link_hash_undefined
8875 (*_bfd_error_handler)
8876 (_("%B: %s symbol `%s' isn't defined"),
8878 ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED
8880 : ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL
8881 ? "internal" : "hidden",
8882 h->root.root.string);
8883 eoinfo->failed = TRUE;
8887 /* If this symbol should be put in the .dynsym section, then put it
8888 there now. We already know the symbol index. We also fill in
8889 the entry in the .hash section. */
8890 if (h->dynindx != -1
8891 && elf_hash_table (finfo->info)->dynamic_sections_created)
8895 sym.st_name = h->dynstr_index;
8896 esym = finfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
8897 if (! check_dynsym (finfo->output_bfd, &sym))
8899 eoinfo->failed = TRUE;
8902 bed->s->swap_symbol_out (finfo->output_bfd, &sym, esym, 0);
8904 if (finfo->hash_sec != NULL)
8906 size_t hash_entry_size;
8907 bfd_byte *bucketpos;
8912 bucketcount = elf_hash_table (finfo->info)->bucketcount;
8913 bucket = h->u.elf_hash_value % bucketcount;
8916 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
8917 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
8918 + (bucket + 2) * hash_entry_size);
8919 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
8920 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
8921 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
8922 ((bfd_byte *) finfo->hash_sec->contents
8923 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
8926 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
8928 Elf_Internal_Versym iversym;
8929 Elf_External_Versym *eversym;
8931 if (!h->def_regular)
8933 if (h->verinfo.verdef == NULL)
8934 iversym.vs_vers = 0;
8936 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
8940 if (h->verinfo.vertree == NULL)
8941 iversym.vs_vers = 1;
8943 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
8944 if (finfo->info->create_default_symver)
8949 iversym.vs_vers |= VERSYM_HIDDEN;
8951 eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
8952 eversym += h->dynindx;
8953 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
8957 /* If we're stripping it, then it was just a dynamic symbol, and
8958 there's nothing else to do. */
8959 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
8962 indx = bfd_get_symcount (finfo->output_bfd);
8963 ret = elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec, h);
8966 eoinfo->failed = TRUE;
8971 else if (h->indx == -2)
8977 /* Return TRUE if special handling is done for relocs in SEC against
8978 symbols defined in discarded sections. */
8981 elf_section_ignore_discarded_relocs (asection *sec)
8983 const struct elf_backend_data *bed;
8985 switch (sec->sec_info_type)
8987 case ELF_INFO_TYPE_STABS:
8988 case ELF_INFO_TYPE_EH_FRAME:
8994 bed = get_elf_backend_data (sec->owner);
8995 if (bed->elf_backend_ignore_discarded_relocs != NULL
8996 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9002 /* Return a mask saying how ld should treat relocations in SEC against
9003 symbols defined in discarded sections. If this function returns
9004 COMPLAIN set, ld will issue a warning message. If this function
9005 returns PRETEND set, and the discarded section was link-once and the
9006 same size as the kept link-once section, ld will pretend that the
9007 symbol was actually defined in the kept section. Otherwise ld will
9008 zero the reloc (at least that is the intent, but some cooperation by
9009 the target dependent code is needed, particularly for REL targets). */
9012 _bfd_elf_default_action_discarded (asection *sec)
9014 if (sec->flags & SEC_DEBUGGING)
9017 if (strcmp (".eh_frame", sec->name) == 0)
9020 if (strcmp (".gcc_except_table", sec->name) == 0)
9023 return COMPLAIN | PRETEND;
9026 /* Find a match between a section and a member of a section group. */
9029 match_group_member (asection *sec, asection *group,
9030 struct bfd_link_info *info)
9032 asection *first = elf_next_in_group (group);
9033 asection *s = first;
9037 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9040 s = elf_next_in_group (s);
9048 /* Check if the kept section of a discarded section SEC can be used
9049 to replace it. Return the replacement if it is OK. Otherwise return
9053 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9057 kept = sec->kept_section;
9060 if ((kept->flags & SEC_GROUP) != 0)
9061 kept = match_group_member (sec, kept, info);
9063 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9064 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9066 sec->kept_section = kept;
9071 /* Link an input file into the linker output file. This function
9072 handles all the sections and relocations of the input file at once.
9073 This is so that we only have to read the local symbols once, and
9074 don't have to keep them in memory. */
9077 elf_link_input_bfd (struct elf_final_link_info *finfo, bfd *input_bfd)
9079 int (*relocate_section)
9080 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9081 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9083 Elf_Internal_Shdr *symtab_hdr;
9086 Elf_Internal_Sym *isymbuf;
9087 Elf_Internal_Sym *isym;
9088 Elf_Internal_Sym *isymend;
9090 asection **ppsection;
9092 const struct elf_backend_data *bed;
9093 struct elf_link_hash_entry **sym_hashes;
9095 output_bfd = finfo->output_bfd;
9096 bed = get_elf_backend_data (output_bfd);
9097 relocate_section = bed->elf_backend_relocate_section;
9099 /* If this is a dynamic object, we don't want to do anything here:
9100 we don't want the local symbols, and we don't want the section
9102 if ((input_bfd->flags & DYNAMIC) != 0)
9105 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9106 if (elf_bad_symtab (input_bfd))
9108 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9113 locsymcount = symtab_hdr->sh_info;
9114 extsymoff = symtab_hdr->sh_info;
9117 /* Read the local symbols. */
9118 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9119 if (isymbuf == NULL && locsymcount != 0)
9121 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9122 finfo->internal_syms,
9123 finfo->external_syms,
9124 finfo->locsym_shndx);
9125 if (isymbuf == NULL)
9129 /* Find local symbol sections and adjust values of symbols in
9130 SEC_MERGE sections. Write out those local symbols we know are
9131 going into the output file. */
9132 isymend = isymbuf + locsymcount;
9133 for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections;
9135 isym++, pindex++, ppsection++)
9139 Elf_Internal_Sym osym;
9145 if (elf_bad_symtab (input_bfd))
9147 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9154 if (isym->st_shndx == SHN_UNDEF)
9155 isec = bfd_und_section_ptr;
9156 else if (isym->st_shndx == SHN_ABS)
9157 isec = bfd_abs_section_ptr;
9158 else if (isym->st_shndx == SHN_COMMON)
9159 isec = bfd_com_section_ptr;
9162 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9165 /* Don't attempt to output symbols with st_shnx in the
9166 reserved range other than SHN_ABS and SHN_COMMON. */
9170 else if (isec->sec_info_type == ELF_INFO_TYPE_MERGE
9171 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9173 _bfd_merged_section_offset (output_bfd, &isec,
9174 elf_section_data (isec)->sec_info,
9180 /* Don't output the first, undefined, symbol. */
9181 if (ppsection == finfo->sections)
9184 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9186 /* We never output section symbols. Instead, we use the
9187 section symbol of the corresponding section in the output
9192 /* If we are stripping all symbols, we don't want to output this
9194 if (finfo->info->strip == strip_all)
9197 /* If we are discarding all local symbols, we don't want to
9198 output this one. If we are generating a relocatable output
9199 file, then some of the local symbols may be required by
9200 relocs; we output them below as we discover that they are
9202 if (finfo->info->discard == discard_all)
9205 /* If this symbol is defined in a section which we are
9206 discarding, we don't need to keep it. */
9207 if (isym->st_shndx != SHN_UNDEF
9208 && isym->st_shndx < SHN_LORESERVE
9209 && bfd_section_removed_from_list (output_bfd,
9210 isec->output_section))
9213 /* Get the name of the symbol. */
9214 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9219 /* See if we are discarding symbols with this name. */
9220 if ((finfo->info->strip == strip_some
9221 && (bfd_hash_lookup (finfo->info->keep_hash, name, FALSE, FALSE)
9223 || (((finfo->info->discard == discard_sec_merge
9224 && (isec->flags & SEC_MERGE) && ! finfo->info->relocatable)
9225 || finfo->info->discard == discard_l)
9226 && bfd_is_local_label_name (input_bfd, name)))
9231 /* Adjust the section index for the output file. */
9232 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9233 isec->output_section);
9234 if (osym.st_shndx == SHN_BAD)
9237 /* ELF symbols in relocatable files are section relative, but
9238 in executable files they are virtual addresses. Note that
9239 this code assumes that all ELF sections have an associated
9240 BFD section with a reasonable value for output_offset; below
9241 we assume that they also have a reasonable value for
9242 output_section. Any special sections must be set up to meet
9243 these requirements. */
9244 osym.st_value += isec->output_offset;
9245 if (! finfo->info->relocatable)
9247 osym.st_value += isec->output_section->vma;
9248 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9250 /* STT_TLS symbols are relative to PT_TLS segment base. */
9251 BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL);
9252 osym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma;
9256 indx = bfd_get_symcount (output_bfd);
9257 ret = elf_link_output_sym (finfo, name, &osym, isec, NULL);
9264 /* Relocate the contents of each section. */
9265 sym_hashes = elf_sym_hashes (input_bfd);
9266 for (o = input_bfd->sections; o != NULL; o = o->next)
9270 if (! o->linker_mark)
9272 /* This section was omitted from the link. */
9276 if (finfo->info->relocatable
9277 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9279 /* Deal with the group signature symbol. */
9280 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9281 unsigned long symndx = sec_data->this_hdr.sh_info;
9282 asection *osec = o->output_section;
9284 if (symndx >= locsymcount
9285 || (elf_bad_symtab (input_bfd)
9286 && finfo->sections[symndx] == NULL))
9288 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9289 while (h->root.type == bfd_link_hash_indirect
9290 || h->root.type == bfd_link_hash_warning)
9291 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9292 /* Arrange for symbol to be output. */
9294 elf_section_data (osec)->this_hdr.sh_info = -2;
9296 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9298 /* We'll use the output section target_index. */
9299 asection *sec = finfo->sections[symndx]->output_section;
9300 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9304 if (finfo->indices[symndx] == -1)
9306 /* Otherwise output the local symbol now. */
9307 Elf_Internal_Sym sym = isymbuf[symndx];
9308 asection *sec = finfo->sections[symndx]->output_section;
9313 name = bfd_elf_string_from_elf_section (input_bfd,
9314 symtab_hdr->sh_link,
9319 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9321 if (sym.st_shndx == SHN_BAD)
9324 sym.st_value += o->output_offset;
9326 indx = bfd_get_symcount (output_bfd);
9327 ret = elf_link_output_sym (finfo, name, &sym, o, NULL);
9331 finfo->indices[symndx] = indx;
9335 elf_section_data (osec)->this_hdr.sh_info
9336 = finfo->indices[symndx];
9340 if ((o->flags & SEC_HAS_CONTENTS) == 0
9341 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9344 if ((o->flags & SEC_LINKER_CREATED) != 0)
9346 /* Section was created by _bfd_elf_link_create_dynamic_sections
9351 /* Get the contents of the section. They have been cached by a
9352 relaxation routine. Note that o is a section in an input
9353 file, so the contents field will not have been set by any of
9354 the routines which work on output files. */
9355 if (elf_section_data (o)->this_hdr.contents != NULL)
9356 contents = elf_section_data (o)->this_hdr.contents;
9359 bfd_size_type amt = o->rawsize ? o->rawsize : o->size;
9361 contents = finfo->contents;
9362 if (! bfd_get_section_contents (input_bfd, o, contents, 0, amt))
9366 if ((o->flags & SEC_RELOC) != 0)
9368 Elf_Internal_Rela *internal_relocs;
9369 Elf_Internal_Rela *rel, *relend;
9370 bfd_vma r_type_mask;
9372 int action_discarded;
9375 /* Get the swapped relocs. */
9377 = _bfd_elf_link_read_relocs (input_bfd, o, finfo->external_relocs,
9378 finfo->internal_relocs, FALSE);
9379 if (internal_relocs == NULL
9380 && o->reloc_count > 0)
9383 if (bed->s->arch_size == 32)
9390 r_type_mask = 0xffffffff;
9394 action_discarded = -1;
9395 if (!elf_section_ignore_discarded_relocs (o))
9396 action_discarded = (*bed->action_discarded) (o);
9398 /* Run through the relocs evaluating complex reloc symbols and
9399 looking for relocs against symbols from discarded sections
9400 or section symbols from removed link-once sections.
9401 Complain about relocs against discarded sections. Zero
9402 relocs against removed link-once sections. */
9404 rel = internal_relocs;
9405 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9406 for ( ; rel < relend; rel++)
9408 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9409 unsigned int s_type;
9410 asection **ps, *sec;
9411 struct elf_link_hash_entry *h = NULL;
9412 const char *sym_name;
9414 if (r_symndx == STN_UNDEF)
9417 if (r_symndx >= locsymcount
9418 || (elf_bad_symtab (input_bfd)
9419 && finfo->sections[r_symndx] == NULL))
9421 h = sym_hashes[r_symndx - extsymoff];
9423 /* Badly formatted input files can contain relocs that
9424 reference non-existant symbols. Check here so that
9425 we do not seg fault. */
9430 sprintf_vma (buffer, rel->r_info);
9431 (*_bfd_error_handler)
9432 (_("error: %B contains a reloc (0x%s) for section %A "
9433 "that references a non-existent global symbol"),
9434 input_bfd, o, buffer);
9435 bfd_set_error (bfd_error_bad_value);
9439 while (h->root.type == bfd_link_hash_indirect
9440 || h->root.type == bfd_link_hash_warning)
9441 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9446 if (h->root.type == bfd_link_hash_defined
9447 || h->root.type == bfd_link_hash_defweak)
9448 ps = &h->root.u.def.section;
9450 sym_name = h->root.root.string;
9454 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9456 s_type = ELF_ST_TYPE (sym->st_info);
9457 ps = &finfo->sections[r_symndx];
9458 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9462 if ((s_type == STT_RELC || s_type == STT_SRELC)
9463 && !finfo->info->relocatable)
9466 bfd_vma dot = (rel->r_offset
9467 + o->output_offset + o->output_section->vma);
9469 printf ("Encountered a complex symbol!");
9470 printf (" (input_bfd %s, section %s, reloc %ld\n",
9471 input_bfd->filename, o->name, rel - internal_relocs);
9472 printf (" symbol: idx %8.8lx, name %s\n",
9473 r_symndx, sym_name);
9474 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9475 (unsigned long) rel->r_info,
9476 (unsigned long) rel->r_offset);
9478 if (!eval_symbol (&val, &sym_name, input_bfd, finfo, dot,
9479 isymbuf, locsymcount, s_type == STT_SRELC))
9482 /* Symbol evaluated OK. Update to absolute value. */
9483 set_symbol_value (input_bfd, isymbuf, locsymcount,
9488 if (action_discarded != -1 && ps != NULL)
9490 /* Complain if the definition comes from a
9491 discarded section. */
9492 if ((sec = *ps) != NULL && elf_discarded_section (sec))
9494 BFD_ASSERT (r_symndx != 0);
9495 if (action_discarded & COMPLAIN)
9496 (*finfo->info->callbacks->einfo)
9497 (_("%X`%s' referenced in section `%A' of %B: "
9498 "defined in discarded section `%A' of %B\n"),
9499 sym_name, o, input_bfd, sec, sec->owner);
9501 /* Try to do the best we can to support buggy old
9502 versions of gcc. Pretend that the symbol is
9503 really defined in the kept linkonce section.
9504 FIXME: This is quite broken. Modifying the
9505 symbol here means we will be changing all later
9506 uses of the symbol, not just in this section. */
9507 if (action_discarded & PRETEND)
9511 kept = _bfd_elf_check_kept_section (sec,
9523 /* Relocate the section by invoking a back end routine.
9525 The back end routine is responsible for adjusting the
9526 section contents as necessary, and (if using Rela relocs
9527 and generating a relocatable output file) adjusting the
9528 reloc addend as necessary.
9530 The back end routine does not have to worry about setting
9531 the reloc address or the reloc symbol index.
9533 The back end routine is given a pointer to the swapped in
9534 internal symbols, and can access the hash table entries
9535 for the external symbols via elf_sym_hashes (input_bfd).
9537 When generating relocatable output, the back end routine
9538 must handle STB_LOCAL/STT_SECTION symbols specially. The
9539 output symbol is going to be a section symbol
9540 corresponding to the output section, which will require
9541 the addend to be adjusted. */
9543 ret = (*relocate_section) (output_bfd, finfo->info,
9544 input_bfd, o, contents,
9552 || finfo->info->relocatable
9553 || finfo->info->emitrelocations)
9555 Elf_Internal_Rela *irela;
9556 Elf_Internal_Rela *irelaend;
9557 bfd_vma last_offset;
9558 struct elf_link_hash_entry **rel_hash;
9559 struct elf_link_hash_entry **rel_hash_list;
9560 Elf_Internal_Shdr *input_rel_hdr, *input_rel_hdr2;
9561 unsigned int next_erel;
9562 bfd_boolean rela_normal;
9564 input_rel_hdr = &elf_section_data (o)->rel_hdr;
9565 rela_normal = (bed->rela_normal
9566 && (input_rel_hdr->sh_entsize
9567 == bed->s->sizeof_rela));
9569 /* Adjust the reloc addresses and symbol indices. */
9571 irela = internal_relocs;
9572 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9573 rel_hash = (elf_section_data (o->output_section)->rel_hashes
9574 + elf_section_data (o->output_section)->rel_count
9575 + elf_section_data (o->output_section)->rel_count2);
9576 rel_hash_list = rel_hash;
9577 last_offset = o->output_offset;
9578 if (!finfo->info->relocatable)
9579 last_offset += o->output_section->vma;
9580 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9582 unsigned long r_symndx;
9584 Elf_Internal_Sym sym;
9586 if (next_erel == bed->s->int_rels_per_ext_rel)
9592 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9595 if (irela->r_offset >= (bfd_vma) -2)
9597 /* This is a reloc for a deleted entry or somesuch.
9598 Turn it into an R_*_NONE reloc, at the same
9599 offset as the last reloc. elf_eh_frame.c and
9600 bfd_elf_discard_info rely on reloc offsets
9602 irela->r_offset = last_offset;
9604 irela->r_addend = 0;
9608 irela->r_offset += o->output_offset;
9610 /* Relocs in an executable have to be virtual addresses. */
9611 if (!finfo->info->relocatable)
9612 irela->r_offset += o->output_section->vma;
9614 last_offset = irela->r_offset;
9616 r_symndx = irela->r_info >> r_sym_shift;
9617 if (r_symndx == STN_UNDEF)
9620 if (r_symndx >= locsymcount
9621 || (elf_bad_symtab (input_bfd)
9622 && finfo->sections[r_symndx] == NULL))
9624 struct elf_link_hash_entry *rh;
9627 /* This is a reloc against a global symbol. We
9628 have not yet output all the local symbols, so
9629 we do not know the symbol index of any global
9630 symbol. We set the rel_hash entry for this
9631 reloc to point to the global hash table entry
9632 for this symbol. The symbol index is then
9633 set at the end of bfd_elf_final_link. */
9634 indx = r_symndx - extsymoff;
9635 rh = elf_sym_hashes (input_bfd)[indx];
9636 while (rh->root.type == bfd_link_hash_indirect
9637 || rh->root.type == bfd_link_hash_warning)
9638 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
9640 /* Setting the index to -2 tells
9641 elf_link_output_extsym that this symbol is
9643 BFD_ASSERT (rh->indx < 0);
9651 /* This is a reloc against a local symbol. */
9654 sym = isymbuf[r_symndx];
9655 sec = finfo->sections[r_symndx];
9656 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
9658 /* I suppose the backend ought to fill in the
9659 section of any STT_SECTION symbol against a
9660 processor specific section. */
9662 if (bfd_is_abs_section (sec))
9664 else if (sec == NULL || sec->owner == NULL)
9666 bfd_set_error (bfd_error_bad_value);
9671 asection *osec = sec->output_section;
9673 /* If we have discarded a section, the output
9674 section will be the absolute section. In
9675 case of discarded SEC_MERGE sections, use
9676 the kept section. relocate_section should
9677 have already handled discarded linkonce
9679 if (bfd_is_abs_section (osec)
9680 && sec->kept_section != NULL
9681 && sec->kept_section->output_section != NULL)
9683 osec = sec->kept_section->output_section;
9684 irela->r_addend -= osec->vma;
9687 if (!bfd_is_abs_section (osec))
9689 r_symndx = osec->target_index;
9692 struct elf_link_hash_table *htab;
9695 htab = elf_hash_table (finfo->info);
9696 oi = htab->text_index_section;
9697 if ((osec->flags & SEC_READONLY) == 0
9698 && htab->data_index_section != NULL)
9699 oi = htab->data_index_section;
9703 irela->r_addend += osec->vma - oi->vma;
9704 r_symndx = oi->target_index;
9708 BFD_ASSERT (r_symndx != 0);
9712 /* Adjust the addend according to where the
9713 section winds up in the output section. */
9715 irela->r_addend += sec->output_offset;
9719 if (finfo->indices[r_symndx] == -1)
9721 unsigned long shlink;
9726 if (finfo->info->strip == strip_all)
9728 /* You can't do ld -r -s. */
9729 bfd_set_error (bfd_error_invalid_operation);
9733 /* This symbol was skipped earlier, but
9734 since it is needed by a reloc, we
9735 must output it now. */
9736 shlink = symtab_hdr->sh_link;
9737 name = (bfd_elf_string_from_elf_section
9738 (input_bfd, shlink, sym.st_name));
9742 osec = sec->output_section;
9744 _bfd_elf_section_from_bfd_section (output_bfd,
9746 if (sym.st_shndx == SHN_BAD)
9749 sym.st_value += sec->output_offset;
9750 if (! finfo->info->relocatable)
9752 sym.st_value += osec->vma;
9753 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
9755 /* STT_TLS symbols are relative to PT_TLS
9757 BFD_ASSERT (elf_hash_table (finfo->info)
9759 sym.st_value -= (elf_hash_table (finfo->info)
9764 indx = bfd_get_symcount (output_bfd);
9765 ret = elf_link_output_sym (finfo, name, &sym, sec,
9770 finfo->indices[r_symndx] = indx;
9775 r_symndx = finfo->indices[r_symndx];
9778 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
9779 | (irela->r_info & r_type_mask));
9782 /* Swap out the relocs. */
9783 if (input_rel_hdr->sh_size != 0
9784 && !bed->elf_backend_emit_relocs (output_bfd, o,
9790 input_rel_hdr2 = elf_section_data (o)->rel_hdr2;
9791 if (input_rel_hdr2 && input_rel_hdr2->sh_size != 0)
9793 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
9794 * bed->s->int_rels_per_ext_rel);
9795 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
9796 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9805 /* Write out the modified section contents. */
9806 if (bed->elf_backend_write_section
9807 && (*bed->elf_backend_write_section) (output_bfd, finfo->info, o,
9810 /* Section written out. */
9812 else switch (o->sec_info_type)
9814 case ELF_INFO_TYPE_STABS:
9815 if (! (_bfd_write_section_stabs
9817 &elf_hash_table (finfo->info)->stab_info,
9818 o, &elf_section_data (o)->sec_info, contents)))
9821 case ELF_INFO_TYPE_MERGE:
9822 if (! _bfd_write_merged_section (output_bfd, o,
9823 elf_section_data (o)->sec_info))
9826 case ELF_INFO_TYPE_EH_FRAME:
9828 if (! _bfd_elf_write_section_eh_frame (output_bfd, finfo->info,
9835 /* FIXME: octets_per_byte. */
9836 if (! (o->flags & SEC_EXCLUDE)
9837 && ! (o->output_section->flags & SEC_NEVER_LOAD)
9838 && ! bfd_set_section_contents (output_bfd, o->output_section,
9840 (file_ptr) o->output_offset,
9851 /* Generate a reloc when linking an ELF file. This is a reloc
9852 requested by the linker, and does not come from any input file. This
9853 is used to build constructor and destructor tables when linking
9857 elf_reloc_link_order (bfd *output_bfd,
9858 struct bfd_link_info *info,
9859 asection *output_section,
9860 struct bfd_link_order *link_order)
9862 reloc_howto_type *howto;
9866 struct elf_link_hash_entry **rel_hash_ptr;
9867 Elf_Internal_Shdr *rel_hdr;
9868 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
9869 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
9873 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
9876 bfd_set_error (bfd_error_bad_value);
9880 addend = link_order->u.reloc.p->addend;
9882 /* Figure out the symbol index. */
9883 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
9884 + elf_section_data (output_section)->rel_count
9885 + elf_section_data (output_section)->rel_count2);
9886 if (link_order->type == bfd_section_reloc_link_order)
9888 indx = link_order->u.reloc.p->u.section->target_index;
9889 BFD_ASSERT (indx != 0);
9890 *rel_hash_ptr = NULL;
9894 struct elf_link_hash_entry *h;
9896 /* Treat a reloc against a defined symbol as though it were
9897 actually against the section. */
9898 h = ((struct elf_link_hash_entry *)
9899 bfd_wrapped_link_hash_lookup (output_bfd, info,
9900 link_order->u.reloc.p->u.name,
9901 FALSE, FALSE, TRUE));
9903 && (h->root.type == bfd_link_hash_defined
9904 || h->root.type == bfd_link_hash_defweak))
9908 section = h->root.u.def.section;
9909 indx = section->output_section->target_index;
9910 *rel_hash_ptr = NULL;
9911 /* It seems that we ought to add the symbol value to the
9912 addend here, but in practice it has already been added
9913 because it was passed to constructor_callback. */
9914 addend += section->output_section->vma + section->output_offset;
9918 /* Setting the index to -2 tells elf_link_output_extsym that
9919 this symbol is used by a reloc. */
9926 if (! ((*info->callbacks->unattached_reloc)
9927 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
9933 /* If this is an inplace reloc, we must write the addend into the
9935 if (howto->partial_inplace && addend != 0)
9938 bfd_reloc_status_type rstat;
9941 const char *sym_name;
9943 size = (bfd_size_type) bfd_get_reloc_size (howto);
9944 buf = (bfd_byte *) bfd_zmalloc (size);
9947 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
9954 case bfd_reloc_outofrange:
9957 case bfd_reloc_overflow:
9958 if (link_order->type == bfd_section_reloc_link_order)
9959 sym_name = bfd_section_name (output_bfd,
9960 link_order->u.reloc.p->u.section);
9962 sym_name = link_order->u.reloc.p->u.name;
9963 if (! ((*info->callbacks->reloc_overflow)
9964 (info, NULL, sym_name, howto->name, addend, NULL,
9965 NULL, (bfd_vma) 0)))
9972 ok = bfd_set_section_contents (output_bfd, output_section, buf,
9973 link_order->offset, size);
9979 /* The address of a reloc is relative to the section in a
9980 relocatable file, and is a virtual address in an executable
9982 offset = link_order->offset;
9983 if (! info->relocatable)
9984 offset += output_section->vma;
9986 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
9988 irel[i].r_offset = offset;
9990 irel[i].r_addend = 0;
9992 if (bed->s->arch_size == 32)
9993 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
9995 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
9997 rel_hdr = &elf_section_data (output_section)->rel_hdr;
9998 erel = rel_hdr->contents;
9999 if (rel_hdr->sh_type == SHT_REL)
10001 erel += (elf_section_data (output_section)->rel_count
10002 * bed->s->sizeof_rel);
10003 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10007 irel[0].r_addend = addend;
10008 erel += (elf_section_data (output_section)->rel_count
10009 * bed->s->sizeof_rela);
10010 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10013 ++elf_section_data (output_section)->rel_count;
10019 /* Get the output vma of the section pointed to by the sh_link field. */
10022 elf_get_linked_section_vma (struct bfd_link_order *p)
10024 Elf_Internal_Shdr **elf_shdrp;
10028 s = p->u.indirect.section;
10029 elf_shdrp = elf_elfsections (s->owner);
10030 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10031 elfsec = elf_shdrp[elfsec]->sh_link;
10033 The Intel C compiler generates SHT_IA_64_UNWIND with
10034 SHF_LINK_ORDER. But it doesn't set the sh_link or
10035 sh_info fields. Hence we could get the situation
10036 where elfsec is 0. */
10039 const struct elf_backend_data *bed
10040 = get_elf_backend_data (s->owner);
10041 if (bed->link_order_error_handler)
10042 bed->link_order_error_handler
10043 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10048 s = elf_shdrp[elfsec]->bfd_section;
10049 return s->output_section->vma + s->output_offset;
10054 /* Compare two sections based on the locations of the sections they are
10055 linked to. Used by elf_fixup_link_order. */
10058 compare_link_order (const void * a, const void * b)
10063 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10064 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10067 return apos > bpos;
10071 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10072 order as their linked sections. Returns false if this could not be done
10073 because an output section includes both ordered and unordered
10074 sections. Ideally we'd do this in the linker proper. */
10077 elf_fixup_link_order (bfd *abfd, asection *o)
10079 int seen_linkorder;
10082 struct bfd_link_order *p;
10084 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10086 struct bfd_link_order **sections;
10087 asection *s, *other_sec, *linkorder_sec;
10091 linkorder_sec = NULL;
10093 seen_linkorder = 0;
10094 for (p = o->map_head.link_order; p != NULL; p = p->next)
10096 if (p->type == bfd_indirect_link_order)
10098 s = p->u.indirect.section;
10100 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10101 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10102 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10103 && elfsec < elf_numsections (sub)
10104 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10105 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10119 if (seen_other && seen_linkorder)
10121 if (other_sec && linkorder_sec)
10122 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10124 linkorder_sec->owner, other_sec,
10127 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10129 bfd_set_error (bfd_error_bad_value);
10134 if (!seen_linkorder)
10137 sections = (struct bfd_link_order **)
10138 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10139 if (sections == NULL)
10141 seen_linkorder = 0;
10143 for (p = o->map_head.link_order; p != NULL; p = p->next)
10145 sections[seen_linkorder++] = p;
10147 /* Sort the input sections in the order of their linked section. */
10148 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10149 compare_link_order);
10151 /* Change the offsets of the sections. */
10153 for (n = 0; n < seen_linkorder; n++)
10155 s = sections[n]->u.indirect.section;
10156 offset &= ~(bfd_vma) 0 << s->alignment_power;
10157 s->output_offset = offset;
10158 sections[n]->offset = offset;
10159 /* FIXME: octets_per_byte. */
10160 offset += sections[n]->size;
10168 /* Do the final step of an ELF link. */
10171 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10173 bfd_boolean dynamic;
10174 bfd_boolean emit_relocs;
10176 struct elf_final_link_info finfo;
10178 struct bfd_link_order *p;
10180 bfd_size_type max_contents_size;
10181 bfd_size_type max_external_reloc_size;
10182 bfd_size_type max_internal_reloc_count;
10183 bfd_size_type max_sym_count;
10184 bfd_size_type max_sym_shndx_count;
10186 Elf_Internal_Sym elfsym;
10188 Elf_Internal_Shdr *symtab_hdr;
10189 Elf_Internal_Shdr *symtab_shndx_hdr;
10190 Elf_Internal_Shdr *symstrtab_hdr;
10191 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10192 struct elf_outext_info eoinfo;
10193 bfd_boolean merged;
10194 size_t relativecount = 0;
10195 asection *reldyn = 0;
10197 asection *attr_section = NULL;
10198 bfd_vma attr_size = 0;
10199 const char *std_attrs_section;
10201 if (! is_elf_hash_table (info->hash))
10205 abfd->flags |= DYNAMIC;
10207 dynamic = elf_hash_table (info)->dynamic_sections_created;
10208 dynobj = elf_hash_table (info)->dynobj;
10210 emit_relocs = (info->relocatable
10211 || info->emitrelocations);
10214 finfo.output_bfd = abfd;
10215 finfo.symstrtab = _bfd_elf_stringtab_init ();
10216 if (finfo.symstrtab == NULL)
10221 finfo.dynsym_sec = NULL;
10222 finfo.hash_sec = NULL;
10223 finfo.symver_sec = NULL;
10227 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
10228 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
10229 BFD_ASSERT (finfo.dynsym_sec != NULL);
10230 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
10231 /* Note that it is OK if symver_sec is NULL. */
10234 finfo.contents = NULL;
10235 finfo.external_relocs = NULL;
10236 finfo.internal_relocs = NULL;
10237 finfo.external_syms = NULL;
10238 finfo.locsym_shndx = NULL;
10239 finfo.internal_syms = NULL;
10240 finfo.indices = NULL;
10241 finfo.sections = NULL;
10242 finfo.symbuf = NULL;
10243 finfo.symshndxbuf = NULL;
10244 finfo.symbuf_count = 0;
10245 finfo.shndxbuf_size = 0;
10247 /* The object attributes have been merged. Remove the input
10248 sections from the link, and set the contents of the output
10250 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10251 for (o = abfd->sections; o != NULL; o = o->next)
10253 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10254 || strcmp (o->name, ".gnu.attributes") == 0)
10256 for (p = o->map_head.link_order; p != NULL; p = p->next)
10258 asection *input_section;
10260 if (p->type != bfd_indirect_link_order)
10262 input_section = p->u.indirect.section;
10263 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10264 elf_link_input_bfd ignores this section. */
10265 input_section->flags &= ~SEC_HAS_CONTENTS;
10268 attr_size = bfd_elf_obj_attr_size (abfd);
10271 bfd_set_section_size (abfd, o, attr_size);
10273 /* Skip this section later on. */
10274 o->map_head.link_order = NULL;
10277 o->flags |= SEC_EXCLUDE;
10281 /* Count up the number of relocations we will output for each output
10282 section, so that we know the sizes of the reloc sections. We
10283 also figure out some maximum sizes. */
10284 max_contents_size = 0;
10285 max_external_reloc_size = 0;
10286 max_internal_reloc_count = 0;
10288 max_sym_shndx_count = 0;
10290 for (o = abfd->sections; o != NULL; o = o->next)
10292 struct bfd_elf_section_data *esdo = elf_section_data (o);
10293 o->reloc_count = 0;
10295 for (p = o->map_head.link_order; p != NULL; p = p->next)
10297 unsigned int reloc_count = 0;
10298 struct bfd_elf_section_data *esdi = NULL;
10299 unsigned int *rel_count1;
10301 if (p->type == bfd_section_reloc_link_order
10302 || p->type == bfd_symbol_reloc_link_order)
10304 else if (p->type == bfd_indirect_link_order)
10308 sec = p->u.indirect.section;
10309 esdi = elf_section_data (sec);
10311 /* Mark all sections which are to be included in the
10312 link. This will normally be every section. We need
10313 to do this so that we can identify any sections which
10314 the linker has decided to not include. */
10315 sec->linker_mark = TRUE;
10317 if (sec->flags & SEC_MERGE)
10320 if (info->relocatable || info->emitrelocations)
10321 reloc_count = sec->reloc_count;
10322 else if (bed->elf_backend_count_relocs)
10323 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10325 if (sec->rawsize > max_contents_size)
10326 max_contents_size = sec->rawsize;
10327 if (sec->size > max_contents_size)
10328 max_contents_size = sec->size;
10330 /* We are interested in just local symbols, not all
10332 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10333 && (sec->owner->flags & DYNAMIC) == 0)
10337 if (elf_bad_symtab (sec->owner))
10338 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10339 / bed->s->sizeof_sym);
10341 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10343 if (sym_count > max_sym_count)
10344 max_sym_count = sym_count;
10346 if (sym_count > max_sym_shndx_count
10347 && elf_symtab_shndx (sec->owner) != 0)
10348 max_sym_shndx_count = sym_count;
10350 if ((sec->flags & SEC_RELOC) != 0)
10354 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
10355 if (ext_size > max_external_reloc_size)
10356 max_external_reloc_size = ext_size;
10357 if (sec->reloc_count > max_internal_reloc_count)
10358 max_internal_reloc_count = sec->reloc_count;
10363 if (reloc_count == 0)
10366 o->reloc_count += reloc_count;
10368 /* MIPS may have a mix of REL and RELA relocs on sections.
10369 To support this curious ABI we keep reloc counts in
10370 elf_section_data too. We must be careful to add the
10371 relocations from the input section to the right output
10372 count. FIXME: Get rid of one count. We have
10373 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
10374 rel_count1 = &esdo->rel_count;
10377 bfd_boolean same_size;
10378 bfd_size_type entsize1;
10380 entsize1 = esdi->rel_hdr.sh_entsize;
10381 /* PR 9827: If the header size has not been set yet then
10382 assume that it will match the output section's reloc type. */
10384 entsize1 = o->use_rela_p ? bed->s->sizeof_rela : bed->s->sizeof_rel;
10386 BFD_ASSERT (entsize1 == bed->s->sizeof_rel
10387 || entsize1 == bed->s->sizeof_rela);
10388 same_size = !o->use_rela_p == (entsize1 == bed->s->sizeof_rel);
10391 rel_count1 = &esdo->rel_count2;
10393 if (esdi->rel_hdr2 != NULL)
10395 bfd_size_type entsize2 = esdi->rel_hdr2->sh_entsize;
10396 unsigned int alt_count;
10397 unsigned int *rel_count2;
10399 BFD_ASSERT (entsize2 != entsize1
10400 && (entsize2 == bed->s->sizeof_rel
10401 || entsize2 == bed->s->sizeof_rela));
10403 rel_count2 = &esdo->rel_count2;
10405 rel_count2 = &esdo->rel_count;
10407 /* The following is probably too simplistic if the
10408 backend counts output relocs unusually. */
10409 BFD_ASSERT (bed->elf_backend_count_relocs == NULL);
10410 alt_count = NUM_SHDR_ENTRIES (esdi->rel_hdr2);
10411 *rel_count2 += alt_count;
10412 reloc_count -= alt_count;
10415 *rel_count1 += reloc_count;
10418 if (o->reloc_count > 0)
10419 o->flags |= SEC_RELOC;
10422 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10423 set it (this is probably a bug) and if it is set
10424 assign_section_numbers will create a reloc section. */
10425 o->flags &=~ SEC_RELOC;
10428 /* If the SEC_ALLOC flag is not set, force the section VMA to
10429 zero. This is done in elf_fake_sections as well, but forcing
10430 the VMA to 0 here will ensure that relocs against these
10431 sections are handled correctly. */
10432 if ((o->flags & SEC_ALLOC) == 0
10433 && ! o->user_set_vma)
10437 if (! info->relocatable && merged)
10438 elf_link_hash_traverse (elf_hash_table (info),
10439 _bfd_elf_link_sec_merge_syms, abfd);
10441 /* Figure out the file positions for everything but the symbol table
10442 and the relocs. We set symcount to force assign_section_numbers
10443 to create a symbol table. */
10444 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
10445 BFD_ASSERT (! abfd->output_has_begun);
10446 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10449 /* Set sizes, and assign file positions for reloc sections. */
10450 for (o = abfd->sections; o != NULL; o = o->next)
10452 if ((o->flags & SEC_RELOC) != 0)
10454 if (!(_bfd_elf_link_size_reloc_section
10455 (abfd, &elf_section_data (o)->rel_hdr, o)))
10458 if (elf_section_data (o)->rel_hdr2
10459 && !(_bfd_elf_link_size_reloc_section
10460 (abfd, elf_section_data (o)->rel_hdr2, o)))
10464 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10465 to count upwards while actually outputting the relocations. */
10466 elf_section_data (o)->rel_count = 0;
10467 elf_section_data (o)->rel_count2 = 0;
10470 _bfd_elf_assign_file_positions_for_relocs (abfd);
10472 /* We have now assigned file positions for all the sections except
10473 .symtab and .strtab. We start the .symtab section at the current
10474 file position, and write directly to it. We build the .strtab
10475 section in memory. */
10476 bfd_get_symcount (abfd) = 0;
10477 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10478 /* sh_name is set in prep_headers. */
10479 symtab_hdr->sh_type = SHT_SYMTAB;
10480 /* sh_flags, sh_addr and sh_size all start off zero. */
10481 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10482 /* sh_link is set in assign_section_numbers. */
10483 /* sh_info is set below. */
10484 /* sh_offset is set just below. */
10485 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10487 off = elf_tdata (abfd)->next_file_pos;
10488 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10490 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10491 incorrect. We do not yet know the size of the .symtab section.
10492 We correct next_file_pos below, after we do know the size. */
10494 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10495 continuously seeking to the right position in the file. */
10496 if (! info->keep_memory || max_sym_count < 20)
10497 finfo.symbuf_size = 20;
10499 finfo.symbuf_size = max_sym_count;
10500 amt = finfo.symbuf_size;
10501 amt *= bed->s->sizeof_sym;
10502 finfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10503 if (finfo.symbuf == NULL)
10505 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10507 /* Wild guess at number of output symbols. realloc'd as needed. */
10508 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10509 finfo.shndxbuf_size = amt;
10510 amt *= sizeof (Elf_External_Sym_Shndx);
10511 finfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10512 if (finfo.symshndxbuf == NULL)
10516 /* Start writing out the symbol table. The first symbol is always a
10518 if (info->strip != strip_all
10521 elfsym.st_value = 0;
10522 elfsym.st_size = 0;
10523 elfsym.st_info = 0;
10524 elfsym.st_other = 0;
10525 elfsym.st_shndx = SHN_UNDEF;
10526 if (elf_link_output_sym (&finfo, NULL, &elfsym, bfd_und_section_ptr,
10531 /* Output a symbol for each section. We output these even if we are
10532 discarding local symbols, since they are used for relocs. These
10533 symbols have no names. We store the index of each one in the
10534 index field of the section, so that we can find it again when
10535 outputting relocs. */
10536 if (info->strip != strip_all
10539 elfsym.st_size = 0;
10540 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10541 elfsym.st_other = 0;
10542 elfsym.st_value = 0;
10543 for (i = 1; i < elf_numsections (abfd); i++)
10545 o = bfd_section_from_elf_index (abfd, i);
10548 o->target_index = bfd_get_symcount (abfd);
10549 elfsym.st_shndx = i;
10550 if (!info->relocatable)
10551 elfsym.st_value = o->vma;
10552 if (elf_link_output_sym (&finfo, NULL, &elfsym, o, NULL) != 1)
10558 /* Allocate some memory to hold information read in from the input
10560 if (max_contents_size != 0)
10562 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10563 if (finfo.contents == NULL)
10567 if (max_external_reloc_size != 0)
10569 finfo.external_relocs = bfd_malloc (max_external_reloc_size);
10570 if (finfo.external_relocs == NULL)
10574 if (max_internal_reloc_count != 0)
10576 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10577 amt *= sizeof (Elf_Internal_Rela);
10578 finfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10579 if (finfo.internal_relocs == NULL)
10583 if (max_sym_count != 0)
10585 amt = max_sym_count * bed->s->sizeof_sym;
10586 finfo.external_syms = (bfd_byte *) bfd_malloc (amt);
10587 if (finfo.external_syms == NULL)
10590 amt = max_sym_count * sizeof (Elf_Internal_Sym);
10591 finfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
10592 if (finfo.internal_syms == NULL)
10595 amt = max_sym_count * sizeof (long);
10596 finfo.indices = (long int *) bfd_malloc (amt);
10597 if (finfo.indices == NULL)
10600 amt = max_sym_count * sizeof (asection *);
10601 finfo.sections = (asection **) bfd_malloc (amt);
10602 if (finfo.sections == NULL)
10606 if (max_sym_shndx_count != 0)
10608 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
10609 finfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
10610 if (finfo.locsym_shndx == NULL)
10614 if (elf_hash_table (info)->tls_sec)
10616 bfd_vma base, end = 0;
10619 for (sec = elf_hash_table (info)->tls_sec;
10620 sec && (sec->flags & SEC_THREAD_LOCAL);
10623 bfd_size_type size = sec->size;
10626 && (sec->flags & SEC_HAS_CONTENTS) == 0)
10628 struct bfd_link_order *ord = sec->map_tail.link_order;
10631 size = ord->offset + ord->size;
10633 end = sec->vma + size;
10635 base = elf_hash_table (info)->tls_sec->vma;
10636 end = align_power (end, elf_hash_table (info)->tls_sec->alignment_power);
10637 elf_hash_table (info)->tls_size = end - base;
10640 /* Reorder SHF_LINK_ORDER sections. */
10641 for (o = abfd->sections; o != NULL; o = o->next)
10643 if (!elf_fixup_link_order (abfd, o))
10647 /* Since ELF permits relocations to be against local symbols, we
10648 must have the local symbols available when we do the relocations.
10649 Since we would rather only read the local symbols once, and we
10650 would rather not keep them in memory, we handle all the
10651 relocations for a single input file at the same time.
10653 Unfortunately, there is no way to know the total number of local
10654 symbols until we have seen all of them, and the local symbol
10655 indices precede the global symbol indices. This means that when
10656 we are generating relocatable output, and we see a reloc against
10657 a global symbol, we can not know the symbol index until we have
10658 finished examining all the local symbols to see which ones we are
10659 going to output. To deal with this, we keep the relocations in
10660 memory, and don't output them until the end of the link. This is
10661 an unfortunate waste of memory, but I don't see a good way around
10662 it. Fortunately, it only happens when performing a relocatable
10663 link, which is not the common case. FIXME: If keep_memory is set
10664 we could write the relocs out and then read them again; I don't
10665 know how bad the memory loss will be. */
10667 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10668 sub->output_has_begun = FALSE;
10669 for (o = abfd->sections; o != NULL; o = o->next)
10671 for (p = o->map_head.link_order; p != NULL; p = p->next)
10673 if (p->type == bfd_indirect_link_order
10674 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
10675 == bfd_target_elf_flavour)
10676 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
10678 if (! sub->output_has_begun)
10680 if (! elf_link_input_bfd (&finfo, sub))
10682 sub->output_has_begun = TRUE;
10685 else if (p->type == bfd_section_reloc_link_order
10686 || p->type == bfd_symbol_reloc_link_order)
10688 if (! elf_reloc_link_order (abfd, info, o, p))
10693 if (! _bfd_default_link_order (abfd, info, o, p))
10699 /* Free symbol buffer if needed. */
10700 if (!info->reduce_memory_overheads)
10702 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10703 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10704 && elf_tdata (sub)->symbuf)
10706 free (elf_tdata (sub)->symbuf);
10707 elf_tdata (sub)->symbuf = NULL;
10711 /* Output any global symbols that got converted to local in a
10712 version script or due to symbol visibility. We do this in a
10713 separate step since ELF requires all local symbols to appear
10714 prior to any global symbols. FIXME: We should only do this if
10715 some global symbols were, in fact, converted to become local.
10716 FIXME: Will this work correctly with the Irix 5 linker? */
10717 eoinfo.failed = FALSE;
10718 eoinfo.finfo = &finfo;
10719 eoinfo.localsyms = TRUE;
10720 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
10725 /* If backend needs to output some local symbols not present in the hash
10726 table, do it now. */
10727 if (bed->elf_backend_output_arch_local_syms)
10729 typedef int (*out_sym_func)
10730 (void *, const char *, Elf_Internal_Sym *, asection *,
10731 struct elf_link_hash_entry *);
10733 if (! ((*bed->elf_backend_output_arch_local_syms)
10734 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
10738 /* That wrote out all the local symbols. Finish up the symbol table
10739 with the global symbols. Even if we want to strip everything we
10740 can, we still need to deal with those global symbols that got
10741 converted to local in a version script. */
10743 /* The sh_info field records the index of the first non local symbol. */
10744 symtab_hdr->sh_info = bfd_get_symcount (abfd);
10747 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
10749 Elf_Internal_Sym sym;
10750 bfd_byte *dynsym = finfo.dynsym_sec->contents;
10751 long last_local = 0;
10753 /* Write out the section symbols for the output sections. */
10754 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
10760 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10763 for (s = abfd->sections; s != NULL; s = s->next)
10769 dynindx = elf_section_data (s)->dynindx;
10772 indx = elf_section_data (s)->this_idx;
10773 BFD_ASSERT (indx > 0);
10774 sym.st_shndx = indx;
10775 if (! check_dynsym (abfd, &sym))
10777 sym.st_value = s->vma;
10778 dest = dynsym + dynindx * bed->s->sizeof_sym;
10779 if (last_local < dynindx)
10780 last_local = dynindx;
10781 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10785 /* Write out the local dynsyms. */
10786 if (elf_hash_table (info)->dynlocal)
10788 struct elf_link_local_dynamic_entry *e;
10789 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
10794 /* Copy the internal symbol and turn off visibility.
10795 Note that we saved a word of storage and overwrote
10796 the original st_name with the dynstr_index. */
10798 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
10800 s = bfd_section_from_elf_index (e->input_bfd,
10805 elf_section_data (s->output_section)->this_idx;
10806 if (! check_dynsym (abfd, &sym))
10808 sym.st_value = (s->output_section->vma
10810 + e->isym.st_value);
10813 if (last_local < e->dynindx)
10814 last_local = e->dynindx;
10816 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
10817 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10821 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
10825 /* We get the global symbols from the hash table. */
10826 eoinfo.failed = FALSE;
10827 eoinfo.localsyms = FALSE;
10828 eoinfo.finfo = &finfo;
10829 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
10834 /* If backend needs to output some symbols not present in the hash
10835 table, do it now. */
10836 if (bed->elf_backend_output_arch_syms)
10838 typedef int (*out_sym_func)
10839 (void *, const char *, Elf_Internal_Sym *, asection *,
10840 struct elf_link_hash_entry *);
10842 if (! ((*bed->elf_backend_output_arch_syms)
10843 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
10847 /* Flush all symbols to the file. */
10848 if (! elf_link_flush_output_syms (&finfo, bed))
10851 /* Now we know the size of the symtab section. */
10852 off += symtab_hdr->sh_size;
10854 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
10855 if (symtab_shndx_hdr->sh_name != 0)
10857 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
10858 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
10859 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
10860 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
10861 symtab_shndx_hdr->sh_size = amt;
10863 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
10866 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
10867 || (bfd_bwrite (finfo.symshndxbuf, amt, abfd) != amt))
10872 /* Finish up and write out the symbol string table (.strtab)
10874 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
10875 /* sh_name was set in prep_headers. */
10876 symstrtab_hdr->sh_type = SHT_STRTAB;
10877 symstrtab_hdr->sh_flags = 0;
10878 symstrtab_hdr->sh_addr = 0;
10879 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
10880 symstrtab_hdr->sh_entsize = 0;
10881 symstrtab_hdr->sh_link = 0;
10882 symstrtab_hdr->sh_info = 0;
10883 /* sh_offset is set just below. */
10884 symstrtab_hdr->sh_addralign = 1;
10886 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
10887 elf_tdata (abfd)->next_file_pos = off;
10889 if (bfd_get_symcount (abfd) > 0)
10891 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
10892 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
10896 /* Adjust the relocs to have the correct symbol indices. */
10897 for (o = abfd->sections; o != NULL; o = o->next)
10899 if ((o->flags & SEC_RELOC) == 0)
10902 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
10903 elf_section_data (o)->rel_count,
10904 elf_section_data (o)->rel_hashes);
10905 if (elf_section_data (o)->rel_hdr2 != NULL)
10906 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
10907 elf_section_data (o)->rel_count2,
10908 (elf_section_data (o)->rel_hashes
10909 + elf_section_data (o)->rel_count));
10911 /* Set the reloc_count field to 0 to prevent write_relocs from
10912 trying to swap the relocs out itself. */
10913 o->reloc_count = 0;
10916 if (dynamic && info->combreloc && dynobj != NULL)
10917 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
10919 /* If we are linking against a dynamic object, or generating a
10920 shared library, finish up the dynamic linking information. */
10923 bfd_byte *dyncon, *dynconend;
10925 /* Fix up .dynamic entries. */
10926 o = bfd_get_section_by_name (dynobj, ".dynamic");
10927 BFD_ASSERT (o != NULL);
10929 dyncon = o->contents;
10930 dynconend = o->contents + o->size;
10931 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
10933 Elf_Internal_Dyn dyn;
10937 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
10944 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
10946 switch (elf_section_data (reldyn)->this_hdr.sh_type)
10948 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
10949 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
10952 dyn.d_un.d_val = relativecount;
10959 name = info->init_function;
10962 name = info->fini_function;
10965 struct elf_link_hash_entry *h;
10967 h = elf_link_hash_lookup (elf_hash_table (info), name,
10968 FALSE, FALSE, TRUE);
10970 && (h->root.type == bfd_link_hash_defined
10971 || h->root.type == bfd_link_hash_defweak))
10973 dyn.d_un.d_ptr = h->root.u.def.value;
10974 o = h->root.u.def.section;
10975 if (o->output_section != NULL)
10976 dyn.d_un.d_ptr += (o->output_section->vma
10977 + o->output_offset);
10980 /* The symbol is imported from another shared
10981 library and does not apply to this one. */
10982 dyn.d_un.d_ptr = 0;
10989 case DT_PREINIT_ARRAYSZ:
10990 name = ".preinit_array";
10992 case DT_INIT_ARRAYSZ:
10993 name = ".init_array";
10995 case DT_FINI_ARRAYSZ:
10996 name = ".fini_array";
10998 o = bfd_get_section_by_name (abfd, name);
11001 (*_bfd_error_handler)
11002 (_("%B: could not find output section %s"), abfd, name);
11006 (*_bfd_error_handler)
11007 (_("warning: %s section has zero size"), name);
11008 dyn.d_un.d_val = o->size;
11011 case DT_PREINIT_ARRAY:
11012 name = ".preinit_array";
11014 case DT_INIT_ARRAY:
11015 name = ".init_array";
11017 case DT_FINI_ARRAY:
11018 name = ".fini_array";
11025 name = ".gnu.hash";
11034 name = ".gnu.version_d";
11037 name = ".gnu.version_r";
11040 name = ".gnu.version";
11042 o = bfd_get_section_by_name (abfd, name);
11045 (*_bfd_error_handler)
11046 (_("%B: could not find output section %s"), abfd, name);
11049 dyn.d_un.d_ptr = o->vma;
11056 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11060 dyn.d_un.d_val = 0;
11061 dyn.d_un.d_ptr = 0;
11062 for (i = 1; i < elf_numsections (abfd); i++)
11064 Elf_Internal_Shdr *hdr;
11066 hdr = elf_elfsections (abfd)[i];
11067 if (hdr->sh_type == type
11068 && (hdr->sh_flags & SHF_ALLOC) != 0)
11070 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11071 dyn.d_un.d_val += hdr->sh_size;
11074 if (dyn.d_un.d_ptr == 0
11075 || hdr->sh_addr < dyn.d_un.d_ptr)
11076 dyn.d_un.d_ptr = hdr->sh_addr;
11082 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11086 /* If we have created any dynamic sections, then output them. */
11087 if (dynobj != NULL)
11089 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11092 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11093 if (info->warn_shared_textrel && info->shared)
11095 bfd_byte *dyncon, *dynconend;
11097 /* Fix up .dynamic entries. */
11098 o = bfd_get_section_by_name (dynobj, ".dynamic");
11099 BFD_ASSERT (o != NULL);
11101 dyncon = o->contents;
11102 dynconend = o->contents + o->size;
11103 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11105 Elf_Internal_Dyn dyn;
11107 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11109 if (dyn.d_tag == DT_TEXTREL)
11111 info->callbacks->einfo
11112 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11118 for (o = dynobj->sections; o != NULL; o = o->next)
11120 if ((o->flags & SEC_HAS_CONTENTS) == 0
11122 || o->output_section == bfd_abs_section_ptr)
11124 if ((o->flags & SEC_LINKER_CREATED) == 0)
11126 /* At this point, we are only interested in sections
11127 created by _bfd_elf_link_create_dynamic_sections. */
11130 if (elf_hash_table (info)->stab_info.stabstr == o)
11132 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11134 if ((elf_section_data (o->output_section)->this_hdr.sh_type
11136 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
11138 /* FIXME: octets_per_byte. */
11139 if (! bfd_set_section_contents (abfd, o->output_section,
11141 (file_ptr) o->output_offset,
11147 /* The contents of the .dynstr section are actually in a
11149 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11150 if (bfd_seek (abfd, off, SEEK_SET) != 0
11151 || ! _bfd_elf_strtab_emit (abfd,
11152 elf_hash_table (info)->dynstr))
11158 if (info->relocatable)
11160 bfd_boolean failed = FALSE;
11162 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11167 /* If we have optimized stabs strings, output them. */
11168 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11170 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11174 if (info->eh_frame_hdr)
11176 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11180 if (finfo.symstrtab != NULL)
11181 _bfd_stringtab_free (finfo.symstrtab);
11182 if (finfo.contents != NULL)
11183 free (finfo.contents);
11184 if (finfo.external_relocs != NULL)
11185 free (finfo.external_relocs);
11186 if (finfo.internal_relocs != NULL)
11187 free (finfo.internal_relocs);
11188 if (finfo.external_syms != NULL)
11189 free (finfo.external_syms);
11190 if (finfo.locsym_shndx != NULL)
11191 free (finfo.locsym_shndx);
11192 if (finfo.internal_syms != NULL)
11193 free (finfo.internal_syms);
11194 if (finfo.indices != NULL)
11195 free (finfo.indices);
11196 if (finfo.sections != NULL)
11197 free (finfo.sections);
11198 if (finfo.symbuf != NULL)
11199 free (finfo.symbuf);
11200 if (finfo.symshndxbuf != NULL)
11201 free (finfo.symshndxbuf);
11202 for (o = abfd->sections; o != NULL; o = o->next)
11204 if ((o->flags & SEC_RELOC) != 0
11205 && elf_section_data (o)->rel_hashes != NULL)
11206 free (elf_section_data (o)->rel_hashes);
11209 elf_tdata (abfd)->linker = TRUE;
11213 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11214 if (contents == NULL)
11215 return FALSE; /* Bail out and fail. */
11216 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11217 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11224 if (finfo.symstrtab != NULL)
11225 _bfd_stringtab_free (finfo.symstrtab);
11226 if (finfo.contents != NULL)
11227 free (finfo.contents);
11228 if (finfo.external_relocs != NULL)
11229 free (finfo.external_relocs);
11230 if (finfo.internal_relocs != NULL)
11231 free (finfo.internal_relocs);
11232 if (finfo.external_syms != NULL)
11233 free (finfo.external_syms);
11234 if (finfo.locsym_shndx != NULL)
11235 free (finfo.locsym_shndx);
11236 if (finfo.internal_syms != NULL)
11237 free (finfo.internal_syms);
11238 if (finfo.indices != NULL)
11239 free (finfo.indices);
11240 if (finfo.sections != NULL)
11241 free (finfo.sections);
11242 if (finfo.symbuf != NULL)
11243 free (finfo.symbuf);
11244 if (finfo.symshndxbuf != NULL)
11245 free (finfo.symshndxbuf);
11246 for (o = abfd->sections; o != NULL; o = o->next)
11248 if ((o->flags & SEC_RELOC) != 0
11249 && elf_section_data (o)->rel_hashes != NULL)
11250 free (elf_section_data (o)->rel_hashes);
11256 /* Initialize COOKIE for input bfd ABFD. */
11259 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11260 struct bfd_link_info *info, bfd *abfd)
11262 Elf_Internal_Shdr *symtab_hdr;
11263 const struct elf_backend_data *bed;
11265 bed = get_elf_backend_data (abfd);
11266 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11268 cookie->abfd = abfd;
11269 cookie->sym_hashes = elf_sym_hashes (abfd);
11270 cookie->bad_symtab = elf_bad_symtab (abfd);
11271 if (cookie->bad_symtab)
11273 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11274 cookie->extsymoff = 0;
11278 cookie->locsymcount = symtab_hdr->sh_info;
11279 cookie->extsymoff = symtab_hdr->sh_info;
11282 if (bed->s->arch_size == 32)
11283 cookie->r_sym_shift = 8;
11285 cookie->r_sym_shift = 32;
11287 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11288 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11290 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11291 cookie->locsymcount, 0,
11293 if (cookie->locsyms == NULL)
11295 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11298 if (info->keep_memory)
11299 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11304 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11307 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11309 Elf_Internal_Shdr *symtab_hdr;
11311 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11312 if (cookie->locsyms != NULL
11313 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11314 free (cookie->locsyms);
11317 /* Initialize the relocation information in COOKIE for input section SEC
11318 of input bfd ABFD. */
11321 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11322 struct bfd_link_info *info, bfd *abfd,
11325 const struct elf_backend_data *bed;
11327 if (sec->reloc_count == 0)
11329 cookie->rels = NULL;
11330 cookie->relend = NULL;
11334 bed = get_elf_backend_data (abfd);
11336 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11337 info->keep_memory);
11338 if (cookie->rels == NULL)
11340 cookie->rel = cookie->rels;
11341 cookie->relend = (cookie->rels
11342 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11344 cookie->rel = cookie->rels;
11348 /* Free the memory allocated by init_reloc_cookie_rels,
11352 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11355 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11356 free (cookie->rels);
11359 /* Initialize the whole of COOKIE for input section SEC. */
11362 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11363 struct bfd_link_info *info,
11366 if (!init_reloc_cookie (cookie, info, sec->owner))
11368 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11373 fini_reloc_cookie (cookie, sec->owner);
11378 /* Free the memory allocated by init_reloc_cookie_for_section,
11382 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11385 fini_reloc_cookie_rels (cookie, sec);
11386 fini_reloc_cookie (cookie, sec->owner);
11389 /* Garbage collect unused sections. */
11391 /* Default gc_mark_hook. */
11394 _bfd_elf_gc_mark_hook (asection *sec,
11395 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11396 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11397 struct elf_link_hash_entry *h,
11398 Elf_Internal_Sym *sym)
11400 const char *sec_name;
11404 switch (h->root.type)
11406 case bfd_link_hash_defined:
11407 case bfd_link_hash_defweak:
11408 return h->root.u.def.section;
11410 case bfd_link_hash_common:
11411 return h->root.u.c.p->section;
11413 case bfd_link_hash_undefined:
11414 case bfd_link_hash_undefweak:
11415 /* To work around a glibc bug, keep all XXX input sections
11416 when there is an as yet undefined reference to __start_XXX
11417 or __stop_XXX symbols. The linker will later define such
11418 symbols for orphan input sections that have a name
11419 representable as a C identifier. */
11420 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11421 sec_name = h->root.root.string + 8;
11422 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11423 sec_name = h->root.root.string + 7;
11427 if (sec_name && *sec_name != '\0')
11431 for (i = info->input_bfds; i; i = i->link_next)
11433 sec = bfd_get_section_by_name (i, sec_name);
11435 sec->flags |= SEC_KEEP;
11445 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11450 /* COOKIE->rel describes a relocation against section SEC, which is
11451 a section we've decided to keep. Return the section that contains
11452 the relocation symbol, or NULL if no section contains it. */
11455 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11456 elf_gc_mark_hook_fn gc_mark_hook,
11457 struct elf_reloc_cookie *cookie)
11459 unsigned long r_symndx;
11460 struct elf_link_hash_entry *h;
11462 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11466 if (r_symndx >= cookie->locsymcount
11467 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11469 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11470 while (h->root.type == bfd_link_hash_indirect
11471 || h->root.type == bfd_link_hash_warning)
11472 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11473 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11476 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11477 &cookie->locsyms[r_symndx]);
11480 /* COOKIE->rel describes a relocation against section SEC, which is
11481 a section we've decided to keep. Mark the section that contains
11482 the relocation symbol. */
11485 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11487 elf_gc_mark_hook_fn gc_mark_hook,
11488 struct elf_reloc_cookie *cookie)
11492 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11493 if (rsec && !rsec->gc_mark)
11495 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
11497 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11503 /* The mark phase of garbage collection. For a given section, mark
11504 it and any sections in this section's group, and all the sections
11505 which define symbols to which it refers. */
11508 _bfd_elf_gc_mark (struct bfd_link_info *info,
11510 elf_gc_mark_hook_fn gc_mark_hook)
11513 asection *group_sec, *eh_frame;
11517 /* Mark all the sections in the group. */
11518 group_sec = elf_section_data (sec)->next_in_group;
11519 if (group_sec && !group_sec->gc_mark)
11520 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11523 /* Look through the section relocs. */
11525 eh_frame = elf_eh_frame_section (sec->owner);
11526 if ((sec->flags & SEC_RELOC) != 0
11527 && sec->reloc_count > 0
11528 && sec != eh_frame)
11530 struct elf_reloc_cookie cookie;
11532 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11536 for (; cookie.rel < cookie.relend; cookie.rel++)
11537 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11542 fini_reloc_cookie_for_section (&cookie, sec);
11546 if (ret && eh_frame && elf_fde_list (sec))
11548 struct elf_reloc_cookie cookie;
11550 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11554 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11555 gc_mark_hook, &cookie))
11557 fini_reloc_cookie_for_section (&cookie, eh_frame);
11564 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11566 struct elf_gc_sweep_symbol_info
11568 struct bfd_link_info *info;
11569 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
11574 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
11576 if (h->root.type == bfd_link_hash_warning)
11577 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11579 if ((h->root.type == bfd_link_hash_defined
11580 || h->root.type == bfd_link_hash_defweak)
11581 && !h->root.u.def.section->gc_mark
11582 && !(h->root.u.def.section->owner->flags & DYNAMIC))
11584 struct elf_gc_sweep_symbol_info *inf =
11585 (struct elf_gc_sweep_symbol_info *) data;
11586 (*inf->hide_symbol) (inf->info, h, TRUE);
11592 /* The sweep phase of garbage collection. Remove all garbage sections. */
11594 typedef bfd_boolean (*gc_sweep_hook_fn)
11595 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
11598 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
11601 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11602 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
11603 unsigned long section_sym_count;
11604 struct elf_gc_sweep_symbol_info sweep_info;
11606 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11610 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11613 for (o = sub->sections; o != NULL; o = o->next)
11615 /* When any section in a section group is kept, we keep all
11616 sections in the section group. If the first member of
11617 the section group is excluded, we will also exclude the
11619 if (o->flags & SEC_GROUP)
11621 asection *first = elf_next_in_group (o);
11622 o->gc_mark = first->gc_mark;
11624 else if ((o->flags & (SEC_DEBUGGING | SEC_LINKER_CREATED)) != 0
11625 || (o->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0
11626 || elf_section_data (o)->this_hdr.sh_type == SHT_NOTE)
11628 /* Keep debug, special and SHT_NOTE sections. */
11635 /* Skip sweeping sections already excluded. */
11636 if (o->flags & SEC_EXCLUDE)
11639 /* Since this is early in the link process, it is simple
11640 to remove a section from the output. */
11641 o->flags |= SEC_EXCLUDE;
11643 if (info->print_gc_sections && o->size != 0)
11644 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
11646 /* But we also have to update some of the relocation
11647 info we collected before. */
11649 && (o->flags & SEC_RELOC) != 0
11650 && o->reloc_count > 0
11651 && !bfd_is_abs_section (o->output_section))
11653 Elf_Internal_Rela *internal_relocs;
11657 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
11658 info->keep_memory);
11659 if (internal_relocs == NULL)
11662 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
11664 if (elf_section_data (o)->relocs != internal_relocs)
11665 free (internal_relocs);
11673 /* Remove the symbols that were in the swept sections from the dynamic
11674 symbol table. GCFIXME: Anyone know how to get them out of the
11675 static symbol table as well? */
11676 sweep_info.info = info;
11677 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
11678 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
11681 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
11685 /* Propagate collected vtable information. This is called through
11686 elf_link_hash_traverse. */
11689 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
11691 if (h->root.type == bfd_link_hash_warning)
11692 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11694 /* Those that are not vtables. */
11695 if (h->vtable == NULL || h->vtable->parent == NULL)
11698 /* Those vtables that do not have parents, we cannot merge. */
11699 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
11702 /* If we've already been done, exit. */
11703 if (h->vtable->used && h->vtable->used[-1])
11706 /* Make sure the parent's table is up to date. */
11707 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
11709 if (h->vtable->used == NULL)
11711 /* None of this table's entries were referenced. Re-use the
11713 h->vtable->used = h->vtable->parent->vtable->used;
11714 h->vtable->size = h->vtable->parent->vtable->size;
11719 bfd_boolean *cu, *pu;
11721 /* Or the parent's entries into ours. */
11722 cu = h->vtable->used;
11724 pu = h->vtable->parent->vtable->used;
11727 const struct elf_backend_data *bed;
11728 unsigned int log_file_align;
11730 bed = get_elf_backend_data (h->root.u.def.section->owner);
11731 log_file_align = bed->s->log_file_align;
11732 n = h->vtable->parent->vtable->size >> log_file_align;
11747 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
11750 bfd_vma hstart, hend;
11751 Elf_Internal_Rela *relstart, *relend, *rel;
11752 const struct elf_backend_data *bed;
11753 unsigned int log_file_align;
11755 if (h->root.type == bfd_link_hash_warning)
11756 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11758 /* Take care of both those symbols that do not describe vtables as
11759 well as those that are not loaded. */
11760 if (h->vtable == NULL || h->vtable->parent == NULL)
11763 BFD_ASSERT (h->root.type == bfd_link_hash_defined
11764 || h->root.type == bfd_link_hash_defweak);
11766 sec = h->root.u.def.section;
11767 hstart = h->root.u.def.value;
11768 hend = hstart + h->size;
11770 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
11772 return *(bfd_boolean *) okp = FALSE;
11773 bed = get_elf_backend_data (sec->owner);
11774 log_file_align = bed->s->log_file_align;
11776 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
11778 for (rel = relstart; rel < relend; ++rel)
11779 if (rel->r_offset >= hstart && rel->r_offset < hend)
11781 /* If the entry is in use, do nothing. */
11782 if (h->vtable->used
11783 && (rel->r_offset - hstart) < h->vtable->size)
11785 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
11786 if (h->vtable->used[entry])
11789 /* Otherwise, kill it. */
11790 rel->r_offset = rel->r_info = rel->r_addend = 0;
11796 /* Mark sections containing dynamically referenced symbols. When
11797 building shared libraries, we must assume that any visible symbol is
11801 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
11803 struct bfd_link_info *info = (struct bfd_link_info *) inf;
11805 if (h->root.type == bfd_link_hash_warning)
11806 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11808 if ((h->root.type == bfd_link_hash_defined
11809 || h->root.type == bfd_link_hash_defweak)
11811 || (!info->executable
11813 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
11814 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN)))
11815 h->root.u.def.section->flags |= SEC_KEEP;
11820 /* Keep all sections containing symbols undefined on the command-line,
11821 and the section containing the entry symbol. */
11824 _bfd_elf_gc_keep (struct bfd_link_info *info)
11826 struct bfd_sym_chain *sym;
11828 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
11830 struct elf_link_hash_entry *h;
11832 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
11833 FALSE, FALSE, FALSE);
11836 && (h->root.type == bfd_link_hash_defined
11837 || h->root.type == bfd_link_hash_defweak)
11838 && !bfd_is_abs_section (h->root.u.def.section))
11839 h->root.u.def.section->flags |= SEC_KEEP;
11843 /* Do mark and sweep of unused sections. */
11846 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
11848 bfd_boolean ok = TRUE;
11850 elf_gc_mark_hook_fn gc_mark_hook;
11851 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11853 if (!bed->can_gc_sections
11854 || !is_elf_hash_table (info->hash))
11856 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
11860 bed->gc_keep (info);
11862 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11863 at the .eh_frame section if we can mark the FDEs individually. */
11864 _bfd_elf_begin_eh_frame_parsing (info);
11865 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11868 struct elf_reloc_cookie cookie;
11870 sec = bfd_get_section_by_name (sub, ".eh_frame");
11871 if (sec && init_reloc_cookie_for_section (&cookie, info, sec))
11873 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
11874 if (elf_section_data (sec)->sec_info)
11875 elf_eh_frame_section (sub) = sec;
11876 fini_reloc_cookie_for_section (&cookie, sec);
11879 _bfd_elf_end_eh_frame_parsing (info);
11881 /* Apply transitive closure to the vtable entry usage info. */
11882 elf_link_hash_traverse (elf_hash_table (info),
11883 elf_gc_propagate_vtable_entries_used,
11888 /* Kill the vtable relocations that were not used. */
11889 elf_link_hash_traverse (elf_hash_table (info),
11890 elf_gc_smash_unused_vtentry_relocs,
11895 /* Mark dynamically referenced symbols. */
11896 if (elf_hash_table (info)->dynamic_sections_created)
11897 elf_link_hash_traverse (elf_hash_table (info),
11898 bed->gc_mark_dynamic_ref,
11901 /* Grovel through relocs to find out who stays ... */
11902 gc_mark_hook = bed->gc_mark_hook;
11903 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11907 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11910 for (o = sub->sections; o != NULL; o = o->next)
11911 if ((o->flags & (SEC_EXCLUDE | SEC_KEEP)) == SEC_KEEP && !o->gc_mark)
11912 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
11916 /* Allow the backend to mark additional target specific sections. */
11917 if (bed->gc_mark_extra_sections)
11918 bed->gc_mark_extra_sections (info, gc_mark_hook);
11920 /* ... and mark SEC_EXCLUDE for those that go. */
11921 return elf_gc_sweep (abfd, info);
11924 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
11927 bfd_elf_gc_record_vtinherit (bfd *abfd,
11929 struct elf_link_hash_entry *h,
11932 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
11933 struct elf_link_hash_entry **search, *child;
11934 bfd_size_type extsymcount;
11935 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11937 /* The sh_info field of the symtab header tells us where the
11938 external symbols start. We don't care about the local symbols at
11940 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
11941 if (!elf_bad_symtab (abfd))
11942 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
11944 sym_hashes = elf_sym_hashes (abfd);
11945 sym_hashes_end = sym_hashes + extsymcount;
11947 /* Hunt down the child symbol, which is in this section at the same
11948 offset as the relocation. */
11949 for (search = sym_hashes; search != sym_hashes_end; ++search)
11951 if ((child = *search) != NULL
11952 && (child->root.type == bfd_link_hash_defined
11953 || child->root.type == bfd_link_hash_defweak)
11954 && child->root.u.def.section == sec
11955 && child->root.u.def.value == offset)
11959 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
11960 abfd, sec, (unsigned long) offset);
11961 bfd_set_error (bfd_error_invalid_operation);
11965 if (!child->vtable)
11967 child->vtable = (struct elf_link_virtual_table_entry *)
11968 bfd_zalloc (abfd, sizeof (*child->vtable));
11969 if (!child->vtable)
11974 /* This *should* only be the absolute section. It could potentially
11975 be that someone has defined a non-global vtable though, which
11976 would be bad. It isn't worth paging in the local symbols to be
11977 sure though; that case should simply be handled by the assembler. */
11979 child->vtable->parent = (struct elf_link_hash_entry *) -1;
11982 child->vtable->parent = h;
11987 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
11990 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
11991 asection *sec ATTRIBUTE_UNUSED,
11992 struct elf_link_hash_entry *h,
11995 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11996 unsigned int log_file_align = bed->s->log_file_align;
12000 h->vtable = (struct elf_link_virtual_table_entry *)
12001 bfd_zalloc (abfd, sizeof (*h->vtable));
12006 if (addend >= h->vtable->size)
12008 size_t size, bytes, file_align;
12009 bfd_boolean *ptr = h->vtable->used;
12011 /* While the symbol is undefined, we have to be prepared to handle
12013 file_align = 1 << log_file_align;
12014 if (h->root.type == bfd_link_hash_undefined)
12015 size = addend + file_align;
12019 if (addend >= size)
12021 /* Oops! We've got a reference past the defined end of
12022 the table. This is probably a bug -- shall we warn? */
12023 size = addend + file_align;
12026 size = (size + file_align - 1) & -file_align;
12028 /* Allocate one extra entry for use as a "done" flag for the
12029 consolidation pass. */
12030 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12034 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12040 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12041 * sizeof (bfd_boolean));
12042 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12046 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12051 /* And arrange for that done flag to be at index -1. */
12052 h->vtable->used = ptr + 1;
12053 h->vtable->size = size;
12056 h->vtable->used[addend >> log_file_align] = TRUE;
12061 struct alloc_got_off_arg {
12063 struct bfd_link_info *info;
12066 /* We need a special top-level link routine to convert got reference counts
12067 to real got offsets. */
12070 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12072 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12073 bfd *obfd = gofarg->info->output_bfd;
12074 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12076 if (h->root.type == bfd_link_hash_warning)
12077 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12079 if (h->got.refcount > 0)
12081 h->got.offset = gofarg->gotoff;
12082 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12085 h->got.offset = (bfd_vma) -1;
12090 /* And an accompanying bit to work out final got entry offsets once
12091 we're done. Should be called from final_link. */
12094 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12095 struct bfd_link_info *info)
12098 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12100 struct alloc_got_off_arg gofarg;
12102 BFD_ASSERT (abfd == info->output_bfd);
12104 if (! is_elf_hash_table (info->hash))
12107 /* The GOT offset is relative to the .got section, but the GOT header is
12108 put into the .got.plt section, if the backend uses it. */
12109 if (bed->want_got_plt)
12112 gotoff = bed->got_header_size;
12114 /* Do the local .got entries first. */
12115 for (i = info->input_bfds; i; i = i->link_next)
12117 bfd_signed_vma *local_got;
12118 bfd_size_type j, locsymcount;
12119 Elf_Internal_Shdr *symtab_hdr;
12121 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12124 local_got = elf_local_got_refcounts (i);
12128 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12129 if (elf_bad_symtab (i))
12130 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12132 locsymcount = symtab_hdr->sh_info;
12134 for (j = 0; j < locsymcount; ++j)
12136 if (local_got[j] > 0)
12138 local_got[j] = gotoff;
12139 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12142 local_got[j] = (bfd_vma) -1;
12146 /* Then the global .got entries. .plt refcounts are handled by
12147 adjust_dynamic_symbol */
12148 gofarg.gotoff = gotoff;
12149 gofarg.info = info;
12150 elf_link_hash_traverse (elf_hash_table (info),
12151 elf_gc_allocate_got_offsets,
12156 /* Many folk need no more in the way of final link than this, once
12157 got entry reference counting is enabled. */
12160 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12162 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12165 /* Invoke the regular ELF backend linker to do all the work. */
12166 return bfd_elf_final_link (abfd, info);
12170 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12172 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12174 if (rcookie->bad_symtab)
12175 rcookie->rel = rcookie->rels;
12177 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12179 unsigned long r_symndx;
12181 if (! rcookie->bad_symtab)
12182 if (rcookie->rel->r_offset > offset)
12184 if (rcookie->rel->r_offset != offset)
12187 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12188 if (r_symndx == SHN_UNDEF)
12191 if (r_symndx >= rcookie->locsymcount
12192 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12194 struct elf_link_hash_entry *h;
12196 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12198 while (h->root.type == bfd_link_hash_indirect
12199 || h->root.type == bfd_link_hash_warning)
12200 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12202 if ((h->root.type == bfd_link_hash_defined
12203 || h->root.type == bfd_link_hash_defweak)
12204 && elf_discarded_section (h->root.u.def.section))
12211 /* It's not a relocation against a global symbol,
12212 but it could be a relocation against a local
12213 symbol for a discarded section. */
12215 Elf_Internal_Sym *isym;
12217 /* Need to: get the symbol; get the section. */
12218 isym = &rcookie->locsyms[r_symndx];
12219 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12220 if (isec != NULL && elf_discarded_section (isec))
12228 /* Discard unneeded references to discarded sections.
12229 Returns TRUE if any section's size was changed. */
12230 /* This function assumes that the relocations are in sorted order,
12231 which is true for all known assemblers. */
12234 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12236 struct elf_reloc_cookie cookie;
12237 asection *stab, *eh;
12238 const struct elf_backend_data *bed;
12240 bfd_boolean ret = FALSE;
12242 if (info->traditional_format
12243 || !is_elf_hash_table (info->hash))
12246 _bfd_elf_begin_eh_frame_parsing (info);
12247 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
12249 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12252 bed = get_elf_backend_data (abfd);
12254 if ((abfd->flags & DYNAMIC) != 0)
12258 if (!info->relocatable)
12260 eh = bfd_get_section_by_name (abfd, ".eh_frame");
12263 || bfd_is_abs_section (eh->output_section)))
12267 stab = bfd_get_section_by_name (abfd, ".stab");
12269 && (stab->size == 0
12270 || bfd_is_abs_section (stab->output_section)
12271 || stab->sec_info_type != ELF_INFO_TYPE_STABS))
12276 && bed->elf_backend_discard_info == NULL)
12279 if (!init_reloc_cookie (&cookie, info, abfd))
12283 && stab->reloc_count > 0
12284 && init_reloc_cookie_rels (&cookie, info, abfd, stab))
12286 if (_bfd_discard_section_stabs (abfd, stab,
12287 elf_section_data (stab)->sec_info,
12288 bfd_elf_reloc_symbol_deleted_p,
12291 fini_reloc_cookie_rels (&cookie, stab);
12295 && init_reloc_cookie_rels (&cookie, info, abfd, eh))
12297 _bfd_elf_parse_eh_frame (abfd, info, eh, &cookie);
12298 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
12299 bfd_elf_reloc_symbol_deleted_p,
12302 fini_reloc_cookie_rels (&cookie, eh);
12305 if (bed->elf_backend_discard_info != NULL
12306 && (*bed->elf_backend_discard_info) (abfd, &cookie, info))
12309 fini_reloc_cookie (&cookie, abfd);
12311 _bfd_elf_end_eh_frame_parsing (info);
12313 if (info->eh_frame_hdr
12314 && !info->relocatable
12315 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12321 /* For a SHT_GROUP section, return the group signature. For other
12322 sections, return the normal section name. */
12324 static const char *
12325 section_signature (asection *sec)
12327 if ((sec->flags & SEC_GROUP) != 0
12328 && elf_next_in_group (sec) != NULL
12329 && elf_group_name (elf_next_in_group (sec)) != NULL)
12330 return elf_group_name (elf_next_in_group (sec));
12335 _bfd_elf_section_already_linked (bfd *abfd, asection *sec,
12336 struct bfd_link_info *info)
12339 const char *name, *p;
12340 struct bfd_section_already_linked *l;
12341 struct bfd_section_already_linked_hash_entry *already_linked_list;
12343 if (sec->output_section == bfd_abs_section_ptr)
12346 flags = sec->flags;
12348 /* Return if it isn't a linkonce section. A comdat group section
12349 also has SEC_LINK_ONCE set. */
12350 if ((flags & SEC_LINK_ONCE) == 0)
12353 /* Don't put group member sections on our list of already linked
12354 sections. They are handled as a group via their group section. */
12355 if (elf_sec_group (sec) != NULL)
12358 /* FIXME: When doing a relocatable link, we may have trouble
12359 copying relocations in other sections that refer to local symbols
12360 in the section being discarded. Those relocations will have to
12361 be converted somehow; as of this writing I'm not sure that any of
12362 the backends handle that correctly.
12364 It is tempting to instead not discard link once sections when
12365 doing a relocatable link (technically, they should be discarded
12366 whenever we are building constructors). However, that fails,
12367 because the linker winds up combining all the link once sections
12368 into a single large link once section, which defeats the purpose
12369 of having link once sections in the first place.
12371 Also, not merging link once sections in a relocatable link
12372 causes trouble for MIPS ELF, which relies on link once semantics
12373 to handle the .reginfo section correctly. */
12375 name = section_signature (sec);
12377 if (CONST_STRNEQ (name, ".gnu.linkonce.")
12378 && (p = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
12383 already_linked_list = bfd_section_already_linked_table_lookup (p);
12385 for (l = already_linked_list->entry; l != NULL; l = l->next)
12387 /* We may have 2 different types of sections on the list: group
12388 sections and linkonce sections. Match like sections. */
12389 if ((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
12390 && strcmp (name, section_signature (l->sec)) == 0
12391 && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL)
12393 /* The section has already been linked. See if we should
12394 issue a warning. */
12395 switch (flags & SEC_LINK_DUPLICATES)
12400 case SEC_LINK_DUPLICATES_DISCARD:
12403 case SEC_LINK_DUPLICATES_ONE_ONLY:
12404 (*_bfd_error_handler)
12405 (_("%B: ignoring duplicate section `%A'"),
12409 case SEC_LINK_DUPLICATES_SAME_SIZE:
12410 if (sec->size != l->sec->size)
12411 (*_bfd_error_handler)
12412 (_("%B: duplicate section `%A' has different size"),
12416 case SEC_LINK_DUPLICATES_SAME_CONTENTS:
12417 if (sec->size != l->sec->size)
12418 (*_bfd_error_handler)
12419 (_("%B: duplicate section `%A' has different size"),
12421 else if (sec->size != 0)
12423 bfd_byte *sec_contents, *l_sec_contents;
12425 if (!bfd_malloc_and_get_section (abfd, sec, &sec_contents))
12426 (*_bfd_error_handler)
12427 (_("%B: warning: could not read contents of section `%A'"),
12429 else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec,
12431 (*_bfd_error_handler)
12432 (_("%B: warning: could not read contents of section `%A'"),
12433 l->sec->owner, l->sec);
12434 else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0)
12435 (*_bfd_error_handler)
12436 (_("%B: warning: duplicate section `%A' has different contents"),
12440 free (sec_contents);
12441 if (l_sec_contents)
12442 free (l_sec_contents);
12447 /* Set the output_section field so that lang_add_section
12448 does not create a lang_input_section structure for this
12449 section. Since there might be a symbol in the section
12450 being discarded, we must retain a pointer to the section
12451 which we are really going to use. */
12452 sec->output_section = bfd_abs_section_ptr;
12453 sec->kept_section = l->sec;
12455 if (flags & SEC_GROUP)
12457 asection *first = elf_next_in_group (sec);
12458 asection *s = first;
12462 s->output_section = bfd_abs_section_ptr;
12463 /* Record which group discards it. */
12464 s->kept_section = l->sec;
12465 s = elf_next_in_group (s);
12466 /* These lists are circular. */
12476 /* A single member comdat group section may be discarded by a
12477 linkonce section and vice versa. */
12479 if ((flags & SEC_GROUP) != 0)
12481 asection *first = elf_next_in_group (sec);
12483 if (first != NULL && elf_next_in_group (first) == first)
12484 /* Check this single member group against linkonce sections. */
12485 for (l = already_linked_list->entry; l != NULL; l = l->next)
12486 if ((l->sec->flags & SEC_GROUP) == 0
12487 && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL
12488 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
12490 first->output_section = bfd_abs_section_ptr;
12491 first->kept_section = l->sec;
12492 sec->output_section = bfd_abs_section_ptr;
12497 /* Check this linkonce section against single member groups. */
12498 for (l = already_linked_list->entry; l != NULL; l = l->next)
12499 if (l->sec->flags & SEC_GROUP)
12501 asection *first = elf_next_in_group (l->sec);
12504 && elf_next_in_group (first) == first
12505 && bfd_elf_match_symbols_in_sections (first, sec, info))
12507 sec->output_section = bfd_abs_section_ptr;
12508 sec->kept_section = first;
12513 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12514 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12515 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12516 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12517 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12518 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12519 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12520 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12521 The reverse order cannot happen as there is never a bfd with only the
12522 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12523 matter as here were are looking only for cross-bfd sections. */
12525 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
12526 for (l = already_linked_list->entry; l != NULL; l = l->next)
12527 if ((l->sec->flags & SEC_GROUP) == 0
12528 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
12530 if (abfd != l->sec->owner)
12531 sec->output_section = bfd_abs_section_ptr;
12535 /* This is the first section with this name. Record it. */
12536 if (! bfd_section_already_linked_table_insert (already_linked_list, sec))
12537 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
12541 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
12543 return sym->st_shndx == SHN_COMMON;
12547 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
12553 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
12555 return bfd_com_section_ptr;
12559 _bfd_elf_default_got_elt_size (bfd *abfd,
12560 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12561 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
12562 bfd *ibfd ATTRIBUTE_UNUSED,
12563 unsigned long symndx ATTRIBUTE_UNUSED)
12565 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12566 return bed->s->arch_size / 8;
12569 /* Routines to support the creation of dynamic relocs. */
12571 /* Return true if NAME is a name of a relocation
12572 section associated with section S. */
12575 is_reloc_section (bfd_boolean rela, const char * name, asection * s)
12578 return CONST_STRNEQ (name, ".rela")
12579 && strcmp (bfd_get_section_name (NULL, s), name + 5) == 0;
12581 return CONST_STRNEQ (name, ".rel")
12582 && strcmp (bfd_get_section_name (NULL, s), name + 4) == 0;
12585 /* Returns the name of the dynamic reloc section associated with SEC. */
12587 static const char *
12588 get_dynamic_reloc_section_name (bfd * abfd,
12590 bfd_boolean is_rela)
12593 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
12594 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
12596 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
12600 if (! is_reloc_section (is_rela, name, sec))
12602 static bfd_boolean complained = FALSE;
12606 (*_bfd_error_handler)
12607 (_("%B: bad relocation section name `%s\'"), abfd, name);
12616 /* Returns the dynamic reloc section associated with SEC.
12617 If necessary compute the name of the dynamic reloc section based
12618 on SEC's name (looked up in ABFD's string table) and the setting
12622 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
12624 bfd_boolean is_rela)
12626 asection * reloc_sec = elf_section_data (sec)->sreloc;
12628 if (reloc_sec == NULL)
12630 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12634 reloc_sec = bfd_get_section_by_name (abfd, name);
12636 if (reloc_sec != NULL)
12637 elf_section_data (sec)->sreloc = reloc_sec;
12644 /* Returns the dynamic reloc section associated with SEC. If the
12645 section does not exist it is created and attached to the DYNOBJ
12646 bfd and stored in the SRELOC field of SEC's elf_section_data
12649 ALIGNMENT is the alignment for the newly created section and
12650 IS_RELA defines whether the name should be .rela.<SEC's name>
12651 or .rel.<SEC's name>. The section name is looked up in the
12652 string table associated with ABFD. */
12655 _bfd_elf_make_dynamic_reloc_section (asection * sec,
12657 unsigned int alignment,
12659 bfd_boolean is_rela)
12661 asection * reloc_sec = elf_section_data (sec)->sreloc;
12663 if (reloc_sec == NULL)
12665 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12670 reloc_sec = bfd_get_section_by_name (dynobj, name);
12672 if (reloc_sec == NULL)
12676 flags = (SEC_HAS_CONTENTS | SEC_READONLY | SEC_IN_MEMORY | SEC_LINKER_CREATED);
12677 if ((sec->flags & SEC_ALLOC) != 0)
12678 flags |= SEC_ALLOC | SEC_LOAD;
12680 reloc_sec = bfd_make_section_with_flags (dynobj, name, flags);
12681 if (reloc_sec != NULL)
12683 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
12688 elf_section_data (sec)->sreloc = reloc_sec;
12694 /* Copy the ELF symbol type associated with a linker hash entry. */
12696 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd ATTRIBUTE_UNUSED,
12697 struct bfd_link_hash_entry * hdest,
12698 struct bfd_link_hash_entry * hsrc)
12700 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *)hdest;
12701 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *)hsrc;
12703 ehdest->type = ehsrc->type;