1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2015 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
23 #include "bfd_stdint.h"
28 #include "safe-ctype.h"
29 #include "libiberty.h"
32 /* This struct is used to pass information to routines called via
33 elf_link_hash_traverse which must return failure. */
35 struct elf_info_failed
37 struct bfd_link_info *info;
41 /* This structure is used to pass information to
42 _bfd_elf_link_find_version_dependencies. */
44 struct elf_find_verdep_info
46 /* General link information. */
47 struct bfd_link_info *info;
48 /* The number of dependencies. */
50 /* Whether we had a failure. */
54 static bfd_boolean _bfd_elf_fix_symbol_flags
55 (struct elf_link_hash_entry *, struct elf_info_failed *);
57 /* Define a symbol in a dynamic linkage section. */
59 struct elf_link_hash_entry *
60 _bfd_elf_define_linkage_sym (bfd *abfd,
61 struct bfd_link_info *info,
65 struct elf_link_hash_entry *h;
66 struct bfd_link_hash_entry *bh;
67 const struct elf_backend_data *bed;
69 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
72 /* Zap symbol defined in an as-needed lib that wasn't linked.
73 This is a symptom of a larger problem: Absolute symbols
74 defined in shared libraries can't be overridden, because we
75 lose the link to the bfd which is via the symbol section. */
76 h->root.type = bfd_link_hash_new;
80 bed = get_elf_backend_data (abfd);
81 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
82 sec, 0, NULL, FALSE, bed->collect,
85 h = (struct elf_link_hash_entry *) bh;
88 h->root.linker_def = 1;
90 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
91 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
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_linker_section (abfd, ".got");
111 flags = bed->dynamic_sec_flags;
113 s = bfd_make_section_anyway_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_anyway_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_anyway_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;
190 struct elf_link_hash_entry *h;
192 if (! is_elf_hash_table (info->hash))
195 if (elf_hash_table (info)->dynamic_sections_created)
198 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
201 abfd = elf_hash_table (info)->dynobj;
202 bed = get_elf_backend_data (abfd);
204 flags = bed->dynamic_sec_flags;
206 /* A dynamically linked executable has a .interp section, but a
207 shared library does not. */
208 if (info->executable)
210 s = bfd_make_section_anyway_with_flags (abfd, ".interp",
211 flags | SEC_READONLY);
216 /* Create sections to hold version informations. These are removed
217 if they are not needed. */
218 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d",
219 flags | SEC_READONLY);
221 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
224 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version",
225 flags | SEC_READONLY);
227 || ! bfd_set_section_alignment (abfd, s, 1))
230 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r",
231 flags | SEC_READONLY);
233 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
236 s = bfd_make_section_anyway_with_flags (abfd, ".dynsym",
237 flags | SEC_READONLY);
239 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
242 s = bfd_make_section_anyway_with_flags (abfd, ".dynstr",
243 flags | SEC_READONLY);
247 s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags);
249 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
252 /* The special symbol _DYNAMIC is always set to the start of the
253 .dynamic section. We could set _DYNAMIC in a linker script, but we
254 only want to define it if we are, in fact, creating a .dynamic
255 section. We don't want to define it if there is no .dynamic
256 section, since on some ELF platforms the start up code examines it
257 to decide how to initialize the process. */
258 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC");
259 elf_hash_table (info)->hdynamic = h;
265 s = bfd_make_section_anyway_with_flags (abfd, ".hash",
266 flags | SEC_READONLY);
268 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
270 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
273 if (info->emit_gnu_hash)
275 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
276 flags | SEC_READONLY);
278 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
280 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
281 4 32-bit words followed by variable count of 64-bit words, then
282 variable count of 32-bit words. */
283 if (bed->s->arch_size == 64)
284 elf_section_data (s)->this_hdr.sh_entsize = 0;
286 elf_section_data (s)->this_hdr.sh_entsize = 4;
289 /* Let the backend create the rest of the sections. This lets the
290 backend set the right flags. The backend will normally create
291 the .got and .plt sections. */
292 if (bed->elf_backend_create_dynamic_sections == NULL
293 || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
296 elf_hash_table (info)->dynamic_sections_created = TRUE;
301 /* Create dynamic sections when linking against a dynamic object. */
304 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
306 flagword flags, pltflags;
307 struct elf_link_hash_entry *h;
309 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
310 struct elf_link_hash_table *htab = elf_hash_table (info);
312 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
313 .rel[a].bss sections. */
314 flags = bed->dynamic_sec_flags;
317 if (bed->plt_not_loaded)
318 /* We do not clear SEC_ALLOC here because we still want the OS to
319 allocate space for the section; it's just that there's nothing
320 to read in from the object file. */
321 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
323 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
324 if (bed->plt_readonly)
325 pltflags |= SEC_READONLY;
327 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
329 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
333 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
335 if (bed->want_plt_sym)
337 h = _bfd_elf_define_linkage_sym (abfd, info, s,
338 "_PROCEDURE_LINKAGE_TABLE_");
339 elf_hash_table (info)->hplt = h;
344 s = bfd_make_section_anyway_with_flags (abfd,
345 (bed->rela_plts_and_copies_p
346 ? ".rela.plt" : ".rel.plt"),
347 flags | SEC_READONLY);
349 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
353 if (! _bfd_elf_create_got_section (abfd, info))
356 if (bed->want_dynbss)
358 /* The .dynbss section is a place to put symbols which are defined
359 by dynamic objects, are referenced by regular objects, and are
360 not functions. We must allocate space for them in the process
361 image and use a R_*_COPY reloc to tell the dynamic linker to
362 initialize them at run time. The linker script puts the .dynbss
363 section into the .bss section of the final image. */
364 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
365 (SEC_ALLOC | SEC_LINKER_CREATED));
369 /* The .rel[a].bss section holds copy relocs. This section is not
370 normally needed. We need to create it here, though, so that the
371 linker will map it to an output section. We can't just create it
372 only if we need it, because we will not know whether we need it
373 until we have seen all the input files, and the first time the
374 main linker code calls BFD after examining all the input files
375 (size_dynamic_sections) the input sections have already been
376 mapped to the output sections. If the section turns out not to
377 be needed, we can discard it later. We will never need this
378 section when generating a shared object, since they do not use
382 s = bfd_make_section_anyway_with_flags (abfd,
383 (bed->rela_plts_and_copies_p
384 ? ".rela.bss" : ".rel.bss"),
385 flags | SEC_READONLY);
387 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
395 /* Record a new dynamic symbol. We record the dynamic symbols as we
396 read the input files, since we need to have a list of all of them
397 before we can determine the final sizes of the output sections.
398 Note that we may actually call this function even though we are not
399 going to output any dynamic symbols; in some cases we know that a
400 symbol should be in the dynamic symbol table, but only if there is
404 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
405 struct elf_link_hash_entry *h)
407 if (h->dynindx == -1)
409 struct elf_strtab_hash *dynstr;
414 /* XXX: The ABI draft says the linker must turn hidden and
415 internal symbols into STB_LOCAL symbols when producing the
416 DSO. However, if ld.so honors st_other in the dynamic table,
417 this would not be necessary. */
418 switch (ELF_ST_VISIBILITY (h->other))
422 if (h->root.type != bfd_link_hash_undefined
423 && h->root.type != bfd_link_hash_undefweak)
426 if (!elf_hash_table (info)->is_relocatable_executable)
434 h->dynindx = elf_hash_table (info)->dynsymcount;
435 ++elf_hash_table (info)->dynsymcount;
437 dynstr = elf_hash_table (info)->dynstr;
440 /* Create a strtab to hold the dynamic symbol names. */
441 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
446 /* We don't put any version information in the dynamic string
448 name = h->root.root.string;
449 p = strchr (name, ELF_VER_CHR);
451 /* We know that the p points into writable memory. In fact,
452 there are only a few symbols that have read-only names, being
453 those like _GLOBAL_OFFSET_TABLE_ that are created specially
454 by the backends. Most symbols will have names pointing into
455 an ELF string table read from a file, or to objalloc memory. */
458 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
463 if (indx == (bfd_size_type) -1)
465 h->dynstr_index = indx;
471 /* Mark a symbol dynamic. */
474 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
475 struct elf_link_hash_entry *h,
476 Elf_Internal_Sym *sym)
478 struct bfd_elf_dynamic_list *d = info->dynamic_list;
480 /* It may be called more than once on the same H. */
481 if(h->dynamic || info->relocatable)
484 if ((info->dynamic_data
485 && (h->type == STT_OBJECT
487 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
489 && h->root.type == bfd_link_hash_new
490 && (*d->match) (&d->head, NULL, h->root.root.string)))
494 /* Record an assignment to a symbol made by a linker script. We need
495 this in case some dynamic object refers to this symbol. */
498 bfd_elf_record_link_assignment (bfd *output_bfd,
499 struct bfd_link_info *info,
504 struct elf_link_hash_entry *h, *hv;
505 struct elf_link_hash_table *htab;
506 const struct elf_backend_data *bed;
508 if (!is_elf_hash_table (info->hash))
511 htab = elf_hash_table (info);
512 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
516 switch (h->root.type)
518 case bfd_link_hash_defined:
519 case bfd_link_hash_defweak:
520 case bfd_link_hash_common:
522 case bfd_link_hash_undefweak:
523 case bfd_link_hash_undefined:
524 /* Since we're defining the symbol, don't let it seem to have not
525 been defined. record_dynamic_symbol and size_dynamic_sections
526 may depend on this. */
527 h->root.type = bfd_link_hash_new;
528 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
529 bfd_link_repair_undef_list (&htab->root);
531 case bfd_link_hash_new:
532 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
535 case bfd_link_hash_indirect:
536 /* We had a versioned symbol in a dynamic library. We make the
537 the versioned symbol point to this one. */
538 bed = get_elf_backend_data (output_bfd);
540 while (hv->root.type == bfd_link_hash_indirect
541 || hv->root.type == bfd_link_hash_warning)
542 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
543 /* We don't need to update h->root.u since linker will set them
545 h->root.type = bfd_link_hash_undefined;
546 hv->root.type = bfd_link_hash_indirect;
547 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
548 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
550 case bfd_link_hash_warning:
555 /* If this symbol is being provided by the linker script, and it is
556 currently defined by a dynamic object, but not by a regular
557 object, then mark it as undefined so that the generic linker will
558 force the correct value. */
562 h->root.type = bfd_link_hash_undefined;
564 /* If this symbol is not being provided by the linker script, and it is
565 currently defined by a dynamic object, but not by a regular object,
566 then clear out any version information because the symbol will not be
567 associated with the dynamic object any more. */
571 h->verinfo.verdef = NULL;
577 bed = get_elf_backend_data (output_bfd);
578 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
579 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
580 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
583 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
585 if (!info->relocatable
587 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
588 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
594 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
597 if (! bfd_elf_link_record_dynamic_symbol (info, h))
600 /* If this is a weak defined symbol, and we know a corresponding
601 real symbol from the same dynamic object, make sure the real
602 symbol is also made into a dynamic symbol. */
603 if (h->u.weakdef != NULL
604 && h->u.weakdef->dynindx == -1)
606 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
614 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
615 success, and 2 on a failure caused by attempting to record a symbol
616 in a discarded section, eg. a discarded link-once section symbol. */
619 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
624 struct elf_link_local_dynamic_entry *entry;
625 struct elf_link_hash_table *eht;
626 struct elf_strtab_hash *dynstr;
627 unsigned long dynstr_index;
629 Elf_External_Sym_Shndx eshndx;
630 char esym[sizeof (Elf64_External_Sym)];
632 if (! is_elf_hash_table (info->hash))
635 /* See if the entry exists already. */
636 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
637 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
640 amt = sizeof (*entry);
641 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
645 /* Go find the symbol, so that we can find it's name. */
646 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
647 1, input_indx, &entry->isym, esym, &eshndx))
649 bfd_release (input_bfd, entry);
653 if (entry->isym.st_shndx != SHN_UNDEF
654 && entry->isym.st_shndx < SHN_LORESERVE)
658 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
659 if (s == NULL || bfd_is_abs_section (s->output_section))
661 /* We can still bfd_release here as nothing has done another
662 bfd_alloc. We can't do this later in this function. */
663 bfd_release (input_bfd, entry);
668 name = (bfd_elf_string_from_elf_section
669 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
670 entry->isym.st_name));
672 dynstr = elf_hash_table (info)->dynstr;
675 /* Create a strtab to hold the dynamic symbol names. */
676 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
681 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
682 if (dynstr_index == (unsigned long) -1)
684 entry->isym.st_name = dynstr_index;
686 eht = elf_hash_table (info);
688 entry->next = eht->dynlocal;
689 eht->dynlocal = entry;
690 entry->input_bfd = input_bfd;
691 entry->input_indx = input_indx;
694 /* Whatever binding the symbol had before, it's now local. */
696 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
698 /* The dynindx will be set at the end of size_dynamic_sections. */
703 /* Return the dynindex of a local dynamic symbol. */
706 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
710 struct elf_link_local_dynamic_entry *e;
712 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
713 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
718 /* This function is used to renumber the dynamic symbols, if some of
719 them are removed because they are marked as local. This is called
720 via elf_link_hash_traverse. */
723 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
726 size_t *count = (size_t *) data;
731 if (h->dynindx != -1)
732 h->dynindx = ++(*count);
738 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
739 STB_LOCAL binding. */
742 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
745 size_t *count = (size_t *) data;
747 if (!h->forced_local)
750 if (h->dynindx != -1)
751 h->dynindx = ++(*count);
756 /* Return true if the dynamic symbol for a given section should be
757 omitted when creating a shared library. */
759 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
760 struct bfd_link_info *info,
763 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 return (htab->dynobj != NULL
781 && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
782 && ip->output_section == p);
784 /* There shouldn't be section relative relocations
785 against any other section. */
791 /* Assign dynsym indices. In a shared library we generate a section
792 symbol for each output section, which come first. Next come symbols
793 which have been forced to local binding. Then all of the back-end
794 allocated local dynamic syms, followed by the rest of the global
798 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
799 struct bfd_link_info *info,
800 unsigned long *section_sym_count)
802 unsigned long dynsymcount = 0;
804 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
806 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
808 for (p = output_bfd->sections; p ; p = p->next)
809 if ((p->flags & SEC_EXCLUDE) == 0
810 && (p->flags & SEC_ALLOC) != 0
811 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
812 elf_section_data (p)->dynindx = ++dynsymcount;
814 elf_section_data (p)->dynindx = 0;
816 *section_sym_count = dynsymcount;
818 elf_link_hash_traverse (elf_hash_table (info),
819 elf_link_renumber_local_hash_table_dynsyms,
822 if (elf_hash_table (info)->dynlocal)
824 struct elf_link_local_dynamic_entry *p;
825 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
826 p->dynindx = ++dynsymcount;
829 elf_link_hash_traverse (elf_hash_table (info),
830 elf_link_renumber_hash_table_dynsyms,
833 /* There is an unused NULL entry at the head of the table which
834 we must account for in our count. Unless there weren't any
835 symbols, which means we'll have no table at all. */
836 if (dynsymcount != 0)
839 elf_hash_table (info)->dynsymcount = dynsymcount;
843 /* Merge st_other field. */
846 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
847 const Elf_Internal_Sym *isym,
848 bfd_boolean definition, bfd_boolean dynamic)
850 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
852 /* If st_other has a processor-specific meaning, specific
853 code might be needed here. */
854 if (bed->elf_backend_merge_symbol_attribute)
855 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
860 unsigned symvis = ELF_ST_VISIBILITY (isym->st_other);
861 unsigned hvis = ELF_ST_VISIBILITY (h->other);
863 /* Keep the most constraining visibility. Leave the remainder
864 of the st_other field to elf_backend_merge_symbol_attribute. */
865 if (symvis - 1 < hvis - 1)
866 h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
868 else if (definition && ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT)
869 h->protected_def = 1;
872 /* This function is called when we want to merge a new symbol with an
873 existing symbol. It handles the various cases which arise when we
874 find a definition in a dynamic object, or when there is already a
875 definition in a dynamic object. The new symbol is described by
876 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
877 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
878 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
879 of an old common symbol. We set OVERRIDE if the old symbol is
880 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
881 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
882 to change. By OK to change, we mean that we shouldn't warn if the
883 type or size does change. */
886 _bfd_elf_merge_symbol (bfd *abfd,
887 struct bfd_link_info *info,
889 Elf_Internal_Sym *sym,
892 struct elf_link_hash_entry **sym_hash,
894 bfd_boolean *pold_weak,
895 unsigned int *pold_alignment,
897 bfd_boolean *override,
898 bfd_boolean *type_change_ok,
899 bfd_boolean *size_change_ok)
901 asection *sec, *oldsec;
902 struct elf_link_hash_entry *h;
903 struct elf_link_hash_entry *hi;
904 struct elf_link_hash_entry *flip;
907 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
908 bfd_boolean newweak, oldweak, newfunc, oldfunc;
909 const struct elf_backend_data *bed;
915 bind = ELF_ST_BIND (sym->st_info);
917 if (! bfd_is_und_section (sec))
918 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
920 h = ((struct elf_link_hash_entry *)
921 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
926 bed = get_elf_backend_data (abfd);
928 /* For merging, we only care about real symbols. But we need to make
929 sure that indirect symbol dynamic flags are updated. */
931 while (h->root.type == bfd_link_hash_indirect
932 || h->root.type == bfd_link_hash_warning)
933 h = (struct elf_link_hash_entry *) h->root.u.i.link;
935 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
940 switch (h->root.type)
945 case bfd_link_hash_undefined:
946 case bfd_link_hash_undefweak:
947 oldbfd = h->root.u.undef.abfd;
950 case bfd_link_hash_defined:
951 case bfd_link_hash_defweak:
952 oldbfd = h->root.u.def.section->owner;
953 oldsec = h->root.u.def.section;
956 case bfd_link_hash_common:
957 oldbfd = h->root.u.c.p->section->owner;
958 oldsec = h->root.u.c.p->section;
960 *pold_alignment = h->root.u.c.p->alignment_power;
963 if (poldbfd && *poldbfd == NULL)
966 /* Differentiate strong and weak symbols. */
967 newweak = bind == STB_WEAK;
968 oldweak = (h->root.type == bfd_link_hash_defweak
969 || h->root.type == bfd_link_hash_undefweak);
971 *pold_weak = oldweak;
973 /* This code is for coping with dynamic objects, and is only useful
974 if we are doing an ELF link. */
975 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
978 /* We have to check it for every instance since the first few may be
979 references and not all compilers emit symbol type for undefined
981 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
983 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
984 respectively, is from a dynamic object. */
986 newdyn = (abfd->flags & DYNAMIC) != 0;
988 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
989 syms and defined syms in dynamic libraries respectively.
990 ref_dynamic on the other hand can be set for a symbol defined in
991 a dynamic library, and def_dynamic may not be set; When the
992 definition in a dynamic lib is overridden by a definition in the
993 executable use of the symbol in the dynamic lib becomes a
994 reference to the executable symbol. */
997 if (bfd_is_und_section (sec))
999 if (bind != STB_WEAK)
1001 h->ref_dynamic_nonweak = 1;
1002 hi->ref_dynamic_nonweak = 1;
1008 hi->dynamic_def = 1;
1012 /* If we just created the symbol, mark it as being an ELF symbol.
1013 Other than that, there is nothing to do--there is no merge issue
1014 with a newly defined symbol--so we just return. */
1016 if (h->root.type == bfd_link_hash_new)
1022 /* In cases involving weak versioned symbols, we may wind up trying
1023 to merge a symbol with itself. Catch that here, to avoid the
1024 confusion that results if we try to override a symbol with
1025 itself. The additional tests catch cases like
1026 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1027 dynamic object, which we do want to handle here. */
1029 && (newweak || oldweak)
1030 && ((abfd->flags & DYNAMIC) == 0
1031 || !h->def_regular))
1036 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1037 else if (oldsec != NULL)
1039 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1040 indices used by MIPS ELF. */
1041 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1044 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1045 respectively, appear to be a definition rather than reference. */
1047 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1049 olddef = (h->root.type != bfd_link_hash_undefined
1050 && h->root.type != bfd_link_hash_undefweak
1051 && h->root.type != bfd_link_hash_common);
1053 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1054 respectively, appear to be a function. */
1056 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1057 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1059 oldfunc = (h->type != STT_NOTYPE
1060 && bed->is_function_type (h->type));
1062 /* When we try to create a default indirect symbol from the dynamic
1063 definition with the default version, we skip it if its type and
1064 the type of existing regular definition mismatch. */
1065 if (pold_alignment == NULL
1069 && (((olddef || h->root.type == bfd_link_hash_common)
1070 && ELF_ST_TYPE (sym->st_info) != h->type
1071 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1072 && h->type != STT_NOTYPE
1073 && !(newfunc && oldfunc))
1075 && ((h->type == STT_GNU_IFUNC)
1076 != (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)))))
1082 /* Check TLS symbols. We don't check undefined symbols introduced
1083 by "ld -u" which have no type (and oldbfd NULL), and we don't
1084 check symbols from plugins because they also have no type. */
1086 && (oldbfd->flags & BFD_PLUGIN) == 0
1087 && (abfd->flags & BFD_PLUGIN) == 0
1088 && ELF_ST_TYPE (sym->st_info) != h->type
1089 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1092 bfd_boolean ntdef, tdef;
1093 asection *ntsec, *tsec;
1095 if (h->type == STT_TLS)
1115 (*_bfd_error_handler)
1116 (_("%s: TLS definition in %B section %A "
1117 "mismatches non-TLS definition in %B section %A"),
1118 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1119 else if (!tdef && !ntdef)
1120 (*_bfd_error_handler)
1121 (_("%s: TLS reference in %B "
1122 "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 "
1127 "mismatches non-TLS reference in %B"),
1128 tbfd, tsec, ntbfd, h->root.root.string);
1130 (*_bfd_error_handler)
1131 (_("%s: TLS reference in %B "
1132 "mismatches non-TLS definition in %B section %A"),
1133 tbfd, ntbfd, ntsec, h->root.root.string);
1135 bfd_set_error (bfd_error_bad_value);
1139 /* If the old symbol has non-default visibility, we ignore the new
1140 definition from a dynamic object. */
1142 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1143 && !bfd_is_und_section (sec))
1146 /* Make sure this symbol is dynamic. */
1148 hi->ref_dynamic = 1;
1149 /* A protected symbol has external availability. Make sure it is
1150 recorded as dynamic.
1152 FIXME: Should we check type and size for protected symbol? */
1153 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1154 return bfd_elf_link_record_dynamic_symbol (info, h);
1159 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1162 /* If the new symbol with non-default visibility comes from a
1163 relocatable file and the old definition comes from a dynamic
1164 object, we remove the old definition. */
1165 if (hi->root.type == bfd_link_hash_indirect)
1167 /* Handle the case where the old dynamic definition is
1168 default versioned. We need to copy the symbol info from
1169 the symbol with default version to the normal one if it
1170 was referenced before. */
1173 hi->root.type = h->root.type;
1174 h->root.type = bfd_link_hash_indirect;
1175 (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
1177 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1178 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1180 /* If the new symbol is hidden or internal, completely undo
1181 any dynamic link state. */
1182 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1183 h->forced_local = 0;
1190 /* FIXME: Should we check type and size for protected symbol? */
1200 /* If the old symbol was undefined before, then it will still be
1201 on the undefs list. If the new symbol is undefined or
1202 common, we can't make it bfd_link_hash_new here, because new
1203 undefined or common symbols will be added to the undefs list
1204 by _bfd_generic_link_add_one_symbol. Symbols may not be
1205 added twice to the undefs list. Also, if the new symbol is
1206 undefweak then we don't want to lose the strong undef. */
1207 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1209 h->root.type = bfd_link_hash_undefined;
1210 h->root.u.undef.abfd = abfd;
1214 h->root.type = bfd_link_hash_new;
1215 h->root.u.undef.abfd = NULL;
1218 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1220 /* If the new symbol is hidden or internal, completely undo
1221 any dynamic link state. */
1222 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1223 h->forced_local = 0;
1229 /* FIXME: Should we check type and size for protected symbol? */
1235 /* If a new weak symbol definition comes from a regular file and the
1236 old symbol comes from a dynamic library, we treat the new one as
1237 strong. Similarly, an old weak symbol definition from a regular
1238 file is treated as strong when the new symbol comes from a dynamic
1239 library. Further, an old weak symbol from a dynamic library is
1240 treated as strong if the new symbol is from a dynamic library.
1241 This reflects the way glibc's ld.so works.
1243 Do this before setting *type_change_ok or *size_change_ok so that
1244 we warn properly when dynamic library symbols are overridden. */
1246 if (newdef && !newdyn && olddyn)
1248 if (olddef && newdyn)
1251 /* Allow changes between different types of function symbol. */
1252 if (newfunc && oldfunc)
1253 *type_change_ok = TRUE;
1255 /* It's OK to change the type if either the existing symbol or the
1256 new symbol is weak. A type change is also OK if the old symbol
1257 is undefined and the new symbol is defined. */
1262 && h->root.type == bfd_link_hash_undefined))
1263 *type_change_ok = TRUE;
1265 /* It's OK to change the size if either the existing symbol or the
1266 new symbol is weak, or if the old symbol is undefined. */
1269 || h->root.type == bfd_link_hash_undefined)
1270 *size_change_ok = TRUE;
1272 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1273 symbol, respectively, appears to be a common symbol in a dynamic
1274 object. If a symbol appears in an uninitialized section, and is
1275 not weak, and is not a function, then it may be a common symbol
1276 which was resolved when the dynamic object was created. We want
1277 to treat such symbols specially, because they raise special
1278 considerations when setting the symbol size: if the symbol
1279 appears as a common symbol in a regular object, and the size in
1280 the regular object is larger, we must make sure that we use the
1281 larger size. This problematic case can always be avoided in C,
1282 but it must be handled correctly when using Fortran shared
1285 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1286 likewise for OLDDYNCOMMON and OLDDEF.
1288 Note that this test is just a heuristic, and that it is quite
1289 possible to have an uninitialized symbol in a shared object which
1290 is really a definition, rather than a common symbol. This could
1291 lead to some minor confusion when the symbol really is a common
1292 symbol in some regular object. However, I think it will be
1298 && (sec->flags & SEC_ALLOC) != 0
1299 && (sec->flags & SEC_LOAD) == 0
1302 newdyncommon = TRUE;
1304 newdyncommon = FALSE;
1308 && h->root.type == bfd_link_hash_defined
1310 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1311 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1314 olddyncommon = TRUE;
1316 olddyncommon = FALSE;
1318 /* We now know everything about the old and new symbols. We ask the
1319 backend to check if we can merge them. */
1320 if (bed->merge_symbol != NULL)
1322 if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
1327 /* If both the old and the new symbols look like common symbols in a
1328 dynamic object, set the size of the symbol to the larger of the
1333 && sym->st_size != h->size)
1335 /* Since we think we have two common symbols, issue a multiple
1336 common warning if desired. Note that we only warn if the
1337 size is different. If the size is the same, we simply let
1338 the old symbol override the new one as normally happens with
1339 symbols defined in dynamic objects. */
1341 if (! ((*info->callbacks->multiple_common)
1342 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1345 if (sym->st_size > h->size)
1346 h->size = sym->st_size;
1348 *size_change_ok = TRUE;
1351 /* If we are looking at a dynamic object, and we have found a
1352 definition, we need to see if the symbol was already defined by
1353 some other object. If so, we want to use the existing
1354 definition, and we do not want to report a multiple symbol
1355 definition error; we do this by clobbering *PSEC to be
1356 bfd_und_section_ptr.
1358 We treat a common symbol as a definition if the symbol in the
1359 shared library is a function, since common symbols always
1360 represent variables; this can cause confusion in principle, but
1361 any such confusion would seem to indicate an erroneous program or
1362 shared library. We also permit a common symbol in a regular
1363 object to override a weak symbol in a shared object. */
1368 || (h->root.type == bfd_link_hash_common
1369 && (newweak || newfunc))))
1373 newdyncommon = FALSE;
1375 *psec = sec = bfd_und_section_ptr;
1376 *size_change_ok = TRUE;
1378 /* If we get here when the old symbol is a common symbol, then
1379 we are explicitly letting it override a weak symbol or
1380 function in a dynamic object, and we don't want to warn about
1381 a type change. If the old symbol is a defined symbol, a type
1382 change warning may still be appropriate. */
1384 if (h->root.type == bfd_link_hash_common)
1385 *type_change_ok = TRUE;
1388 /* Handle the special case of an old common symbol merging with a
1389 new symbol which looks like a common symbol in a shared object.
1390 We change *PSEC and *PVALUE to make the new symbol look like a
1391 common symbol, and let _bfd_generic_link_add_one_symbol do the
1395 && h->root.type == bfd_link_hash_common)
1399 newdyncommon = FALSE;
1400 *pvalue = sym->st_size;
1401 *psec = sec = bed->common_section (oldsec);
1402 *size_change_ok = TRUE;
1405 /* Skip weak definitions of symbols that are already defined. */
1406 if (newdef && olddef && newweak)
1408 /* Don't skip new non-IR weak syms. */
1409 if (!(oldbfd != NULL
1410 && (oldbfd->flags & BFD_PLUGIN) != 0
1411 && (abfd->flags & BFD_PLUGIN) == 0))
1417 /* Merge st_other. If the symbol already has a dynamic index,
1418 but visibility says it should not be visible, turn it into a
1420 elf_merge_st_other (abfd, h, sym, newdef, newdyn);
1421 if (h->dynindx != -1)
1422 switch (ELF_ST_VISIBILITY (h->other))
1426 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1431 /* If the old symbol is from a dynamic object, and the new symbol is
1432 a definition which is not from a dynamic object, then the new
1433 symbol overrides the old symbol. Symbols from regular files
1434 always take precedence over symbols from dynamic objects, even if
1435 they are defined after the dynamic object in the link.
1437 As above, we again permit a common symbol in a regular object to
1438 override a definition in a shared object if the shared object
1439 symbol is a function or is weak. */
1444 || (bfd_is_com_section (sec)
1445 && (oldweak || oldfunc)))
1450 /* Change the hash table entry to undefined, and let
1451 _bfd_generic_link_add_one_symbol do the right thing with the
1454 h->root.type = bfd_link_hash_undefined;
1455 h->root.u.undef.abfd = h->root.u.def.section->owner;
1456 *size_change_ok = TRUE;
1459 olddyncommon = FALSE;
1461 /* We again permit a type change when a common symbol may be
1462 overriding a function. */
1464 if (bfd_is_com_section (sec))
1468 /* If a common symbol overrides a function, make sure
1469 that it isn't defined dynamically nor has type
1472 h->type = STT_NOTYPE;
1474 *type_change_ok = TRUE;
1477 if (hi->root.type == bfd_link_hash_indirect)
1480 /* This union may have been set to be non-NULL when this symbol
1481 was seen in a dynamic object. We must force the union to be
1482 NULL, so that it is correct for a regular symbol. */
1483 h->verinfo.vertree = NULL;
1486 /* Handle the special case of a new common symbol merging with an
1487 old symbol that looks like it might be a common symbol defined in
1488 a shared object. Note that we have already handled the case in
1489 which a new common symbol should simply override the definition
1490 in the shared library. */
1493 && bfd_is_com_section (sec)
1496 /* It would be best if we could set the hash table entry to a
1497 common symbol, but we don't know what to use for the section
1498 or the alignment. */
1499 if (! ((*info->callbacks->multiple_common)
1500 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1503 /* If the presumed common symbol in the dynamic object is
1504 larger, pretend that the new symbol has its size. */
1506 if (h->size > *pvalue)
1509 /* We need to remember the alignment required by the symbol
1510 in the dynamic object. */
1511 BFD_ASSERT (pold_alignment);
1512 *pold_alignment = h->root.u.def.section->alignment_power;
1515 olddyncommon = FALSE;
1517 h->root.type = bfd_link_hash_undefined;
1518 h->root.u.undef.abfd = h->root.u.def.section->owner;
1520 *size_change_ok = TRUE;
1521 *type_change_ok = TRUE;
1523 if (hi->root.type == bfd_link_hash_indirect)
1526 h->verinfo.vertree = NULL;
1531 /* Handle the case where we had a versioned symbol in a dynamic
1532 library and now find a definition in a normal object. In this
1533 case, we make the versioned symbol point to the normal one. */
1534 flip->root.type = h->root.type;
1535 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1536 h->root.type = bfd_link_hash_indirect;
1537 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1538 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1542 flip->ref_dynamic = 1;
1549 /* This function is called to create an indirect symbol from the
1550 default for the symbol with the default version if needed. The
1551 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1552 set DYNSYM if the new indirect symbol is dynamic. */
1555 _bfd_elf_add_default_symbol (bfd *abfd,
1556 struct bfd_link_info *info,
1557 struct elf_link_hash_entry *h,
1559 Elf_Internal_Sym *sym,
1563 bfd_boolean *dynsym)
1565 bfd_boolean type_change_ok;
1566 bfd_boolean size_change_ok;
1569 struct elf_link_hash_entry *hi;
1570 struct bfd_link_hash_entry *bh;
1571 const struct elf_backend_data *bed;
1572 bfd_boolean collect;
1573 bfd_boolean dynamic;
1574 bfd_boolean override;
1576 size_t len, shortlen;
1579 /* If this symbol has a version, and it is the default version, we
1580 create an indirect symbol from the default name to the fully
1581 decorated name. This will cause external references which do not
1582 specify a version to be bound to this version of the symbol. */
1583 p = strchr (name, ELF_VER_CHR);
1584 if (p == NULL || p[1] != ELF_VER_CHR)
1587 bed = get_elf_backend_data (abfd);
1588 collect = bed->collect;
1589 dynamic = (abfd->flags & DYNAMIC) != 0;
1591 shortlen = p - name;
1592 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1593 if (shortname == NULL)
1595 memcpy (shortname, name, shortlen);
1596 shortname[shortlen] = '\0';
1598 /* We are going to create a new symbol. Merge it with any existing
1599 symbol with this name. For the purposes of the merge, act as
1600 though we were defining the symbol we just defined, although we
1601 actually going to define an indirect symbol. */
1602 type_change_ok = FALSE;
1603 size_change_ok = FALSE;
1605 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1606 &hi, poldbfd, NULL, NULL, &skip, &override,
1607 &type_change_ok, &size_change_ok))
1616 if (! (_bfd_generic_link_add_one_symbol
1617 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1618 0, name, FALSE, collect, &bh)))
1620 hi = (struct elf_link_hash_entry *) bh;
1624 /* In this case the symbol named SHORTNAME is overriding the
1625 indirect symbol we want to add. We were planning on making
1626 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1627 is the name without a version. NAME is the fully versioned
1628 name, and it is the default version.
1630 Overriding means that we already saw a definition for the
1631 symbol SHORTNAME in a regular object, and it is overriding
1632 the symbol defined in the dynamic object.
1634 When this happens, we actually want to change NAME, the
1635 symbol we just added, to refer to SHORTNAME. This will cause
1636 references to NAME in the shared object to become references
1637 to SHORTNAME in the regular object. This is what we expect
1638 when we override a function in a shared object: that the
1639 references in the shared object will be mapped to the
1640 definition in the regular object. */
1642 while (hi->root.type == bfd_link_hash_indirect
1643 || hi->root.type == bfd_link_hash_warning)
1644 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1646 h->root.type = bfd_link_hash_indirect;
1647 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1651 hi->ref_dynamic = 1;
1655 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1660 /* Now set HI to H, so that the following code will set the
1661 other fields correctly. */
1665 /* Check if HI is a warning symbol. */
1666 if (hi->root.type == bfd_link_hash_warning)
1667 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1669 /* If there is a duplicate definition somewhere, then HI may not
1670 point to an indirect symbol. We will have reported an error to
1671 the user in that case. */
1673 if (hi->root.type == bfd_link_hash_indirect)
1675 struct elf_link_hash_entry *ht;
1677 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1678 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1680 /* A reference to the SHORTNAME symbol from a dynamic library
1681 will be satisfied by the versioned symbol at runtime. In
1682 effect, we have a reference to the versioned symbol. */
1683 ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1684 hi->dynamic_def |= ht->dynamic_def;
1686 /* See if the new flags lead us to realize that the symbol must
1692 if (! info->executable
1699 if (hi->ref_regular)
1705 /* We also need to define an indirection from the nondefault version
1709 len = strlen (name);
1710 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1711 if (shortname == NULL)
1713 memcpy (shortname, name, shortlen);
1714 memcpy (shortname + shortlen, p + 1, len - shortlen);
1716 /* Once again, merge with any existing symbol. */
1717 type_change_ok = FALSE;
1718 size_change_ok = FALSE;
1720 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1721 &hi, poldbfd, NULL, NULL, &skip, &override,
1722 &type_change_ok, &size_change_ok))
1730 /* Here SHORTNAME is a versioned name, so we don't expect to see
1731 the type of override we do in the case above unless it is
1732 overridden by a versioned definition. */
1733 if (hi->root.type != bfd_link_hash_defined
1734 && hi->root.type != bfd_link_hash_defweak)
1735 (*_bfd_error_handler)
1736 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1742 if (! (_bfd_generic_link_add_one_symbol
1743 (info, abfd, shortname, BSF_INDIRECT,
1744 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1746 hi = (struct elf_link_hash_entry *) bh;
1748 /* If there is a duplicate definition somewhere, then HI may not
1749 point to an indirect symbol. We will have reported an error
1750 to the user in that case. */
1752 if (hi->root.type == bfd_link_hash_indirect)
1754 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1755 h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1756 hi->dynamic_def |= h->dynamic_def;
1758 /* See if the new flags lead us to realize that the symbol
1764 if (! info->executable
1770 if (hi->ref_regular)
1780 /* This routine is used to export all defined symbols into the dynamic
1781 symbol table. It is called via elf_link_hash_traverse. */
1784 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1786 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1788 /* Ignore indirect symbols. These are added by the versioning code. */
1789 if (h->root.type == bfd_link_hash_indirect)
1792 /* Ignore this if we won't export it. */
1793 if (!eif->info->export_dynamic && !h->dynamic)
1796 if (h->dynindx == -1
1797 && (h->def_regular || h->ref_regular)
1798 && ! bfd_hide_sym_by_version (eif->info->version_info,
1799 h->root.root.string))
1801 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1811 /* Look through the symbols which are defined in other shared
1812 libraries and referenced here. Update the list of version
1813 dependencies. This will be put into the .gnu.version_r section.
1814 This function is called via elf_link_hash_traverse. */
1817 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1820 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1821 Elf_Internal_Verneed *t;
1822 Elf_Internal_Vernaux *a;
1825 /* We only care about symbols defined in shared objects with version
1830 || h->verinfo.verdef == NULL
1831 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
1832 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
1835 /* See if we already know about this version. */
1836 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1840 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1843 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1844 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1850 /* This is a new version. Add it to tree we are building. */
1855 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1858 rinfo->failed = TRUE;
1862 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1863 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1864 elf_tdata (rinfo->info->output_bfd)->verref = t;
1868 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1871 rinfo->failed = TRUE;
1875 /* Note that we are copying a string pointer here, and testing it
1876 above. If bfd_elf_string_from_elf_section is ever changed to
1877 discard the string data when low in memory, this will have to be
1879 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1881 a->vna_flags = h->verinfo.verdef->vd_flags;
1882 a->vna_nextptr = t->vn_auxptr;
1884 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1887 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1894 /* Figure out appropriate versions for all the symbols. We may not
1895 have the version number script until we have read all of the input
1896 files, so until that point we don't know which symbols should be
1897 local. This function is called via elf_link_hash_traverse. */
1900 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1902 struct elf_info_failed *sinfo;
1903 struct bfd_link_info *info;
1904 const struct elf_backend_data *bed;
1905 struct elf_info_failed eif;
1909 sinfo = (struct elf_info_failed *) data;
1912 /* Fix the symbol flags. */
1915 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1918 sinfo->failed = TRUE;
1922 /* We only need version numbers for symbols defined in regular
1924 if (!h->def_regular)
1927 bed = get_elf_backend_data (info->output_bfd);
1928 p = strchr (h->root.root.string, ELF_VER_CHR);
1929 if (p != NULL && h->verinfo.vertree == NULL)
1931 struct bfd_elf_version_tree *t;
1936 /* There are two consecutive ELF_VER_CHR characters if this is
1937 not a hidden symbol. */
1939 if (*p == ELF_VER_CHR)
1945 /* If there is no version string, we can just return out. */
1953 /* Look for the version. If we find it, it is no longer weak. */
1954 for (t = sinfo->info->version_info; t != NULL; t = t->next)
1956 if (strcmp (t->name, p) == 0)
1960 struct bfd_elf_version_expr *d;
1962 len = p - h->root.root.string;
1963 alc = (char *) bfd_malloc (len);
1966 sinfo->failed = TRUE;
1969 memcpy (alc, h->root.root.string, len - 1);
1970 alc[len - 1] = '\0';
1971 if (alc[len - 2] == ELF_VER_CHR)
1972 alc[len - 2] = '\0';
1974 h->verinfo.vertree = t;
1978 if (t->globals.list != NULL)
1979 d = (*t->match) (&t->globals, NULL, alc);
1981 /* See if there is anything to force this symbol to
1983 if (d == NULL && t->locals.list != NULL)
1985 d = (*t->match) (&t->locals, NULL, alc);
1988 && ! info->export_dynamic)
1989 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1997 /* If we are building an application, we need to create a
1998 version node for this version. */
1999 if (t == NULL && info->executable)
2001 struct bfd_elf_version_tree **pp;
2004 /* If we aren't going to export this symbol, we don't need
2005 to worry about it. */
2006 if (h->dynindx == -1)
2010 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2013 sinfo->failed = TRUE;
2018 t->name_indx = (unsigned int) -1;
2022 /* Don't count anonymous version tag. */
2023 if (sinfo->info->version_info != NULL
2024 && sinfo->info->version_info->vernum == 0)
2026 for (pp = &sinfo->info->version_info;
2030 t->vernum = version_index;
2034 h->verinfo.vertree = t;
2038 /* We could not find the version for a symbol when
2039 generating a shared archive. Return an error. */
2040 (*_bfd_error_handler)
2041 (_("%B: version node not found for symbol %s"),
2042 info->output_bfd, h->root.root.string);
2043 bfd_set_error (bfd_error_bad_value);
2044 sinfo->failed = TRUE;
2052 /* If we don't have a version for this symbol, see if we can find
2054 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2059 = bfd_find_version_for_sym (sinfo->info->version_info,
2060 h->root.root.string, &hide);
2061 if (h->verinfo.vertree != NULL && hide)
2062 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2068 /* Read and swap the relocs from the section indicated by SHDR. This
2069 may be either a REL or a RELA section. The relocations are
2070 translated into RELA relocations and stored in INTERNAL_RELOCS,
2071 which should have already been allocated to contain enough space.
2072 The EXTERNAL_RELOCS are a buffer where the external form of the
2073 relocations should be stored.
2075 Returns FALSE if something goes wrong. */
2078 elf_link_read_relocs_from_section (bfd *abfd,
2080 Elf_Internal_Shdr *shdr,
2081 void *external_relocs,
2082 Elf_Internal_Rela *internal_relocs)
2084 const struct elf_backend_data *bed;
2085 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2086 const bfd_byte *erela;
2087 const bfd_byte *erelaend;
2088 Elf_Internal_Rela *irela;
2089 Elf_Internal_Shdr *symtab_hdr;
2092 /* Position ourselves at the start of the section. */
2093 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2096 /* Read the relocations. */
2097 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2100 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2101 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2103 bed = get_elf_backend_data (abfd);
2105 /* Convert the external relocations to the internal format. */
2106 if (shdr->sh_entsize == bed->s->sizeof_rel)
2107 swap_in = bed->s->swap_reloc_in;
2108 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2109 swap_in = bed->s->swap_reloca_in;
2112 bfd_set_error (bfd_error_wrong_format);
2116 erela = (const bfd_byte *) external_relocs;
2117 erelaend = erela + shdr->sh_size;
2118 irela = internal_relocs;
2119 while (erela < erelaend)
2123 (*swap_in) (abfd, erela, irela);
2124 r_symndx = ELF32_R_SYM (irela->r_info);
2125 if (bed->s->arch_size == 64)
2129 if ((size_t) r_symndx >= nsyms)
2131 (*_bfd_error_handler)
2132 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2133 " for offset 0x%lx in section `%A'"),
2135 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2136 bfd_set_error (bfd_error_bad_value);
2140 else if (r_symndx != STN_UNDEF)
2142 (*_bfd_error_handler)
2143 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2144 " when the object file has no symbol table"),
2146 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2147 bfd_set_error (bfd_error_bad_value);
2150 irela += bed->s->int_rels_per_ext_rel;
2151 erela += shdr->sh_entsize;
2157 /* Read and swap the relocs for a section O. They may have been
2158 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2159 not NULL, they are used as buffers to read into. They are known to
2160 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2161 the return value is allocated using either malloc or bfd_alloc,
2162 according to the KEEP_MEMORY argument. If O has two relocation
2163 sections (both REL and RELA relocations), then the REL_HDR
2164 relocations will appear first in INTERNAL_RELOCS, followed by the
2165 RELA_HDR relocations. */
2168 _bfd_elf_link_read_relocs (bfd *abfd,
2170 void *external_relocs,
2171 Elf_Internal_Rela *internal_relocs,
2172 bfd_boolean keep_memory)
2174 void *alloc1 = NULL;
2175 Elf_Internal_Rela *alloc2 = NULL;
2176 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2177 struct bfd_elf_section_data *esdo = elf_section_data (o);
2178 Elf_Internal_Rela *internal_rela_relocs;
2180 if (esdo->relocs != NULL)
2181 return esdo->relocs;
2183 if (o->reloc_count == 0)
2186 if (internal_relocs == NULL)
2190 size = o->reloc_count;
2191 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2193 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2195 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2196 if (internal_relocs == NULL)
2200 if (external_relocs == NULL)
2202 bfd_size_type size = 0;
2205 size += esdo->rel.hdr->sh_size;
2207 size += esdo->rela.hdr->sh_size;
2209 alloc1 = bfd_malloc (size);
2212 external_relocs = alloc1;
2215 internal_rela_relocs = internal_relocs;
2218 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2222 external_relocs = (((bfd_byte *) external_relocs)
2223 + esdo->rel.hdr->sh_size);
2224 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2225 * bed->s->int_rels_per_ext_rel);
2229 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2231 internal_rela_relocs)))
2234 /* Cache the results for next time, if we can. */
2236 esdo->relocs = internal_relocs;
2241 /* Don't free alloc2, since if it was allocated we are passing it
2242 back (under the name of internal_relocs). */
2244 return internal_relocs;
2252 bfd_release (abfd, alloc2);
2259 /* Compute the size of, and allocate space for, REL_HDR which is the
2260 section header for a section containing relocations for O. */
2263 _bfd_elf_link_size_reloc_section (bfd *abfd,
2264 struct bfd_elf_section_reloc_data *reldata)
2266 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2268 /* That allows us to calculate the size of the section. */
2269 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2271 /* The contents field must last into write_object_contents, so we
2272 allocate it with bfd_alloc rather than malloc. Also since we
2273 cannot be sure that the contents will actually be filled in,
2274 we zero the allocated space. */
2275 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2276 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2279 if (reldata->hashes == NULL && reldata->count)
2281 struct elf_link_hash_entry **p;
2283 p = ((struct elf_link_hash_entry **)
2284 bfd_zmalloc (reldata->count * sizeof (*p)));
2288 reldata->hashes = p;
2294 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2295 originated from the section given by INPUT_REL_HDR) to the
2299 _bfd_elf_link_output_relocs (bfd *output_bfd,
2300 asection *input_section,
2301 Elf_Internal_Shdr *input_rel_hdr,
2302 Elf_Internal_Rela *internal_relocs,
2303 struct elf_link_hash_entry **rel_hash
2306 Elf_Internal_Rela *irela;
2307 Elf_Internal_Rela *irelaend;
2309 struct bfd_elf_section_reloc_data *output_reldata;
2310 asection *output_section;
2311 const struct elf_backend_data *bed;
2312 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2313 struct bfd_elf_section_data *esdo;
2315 output_section = input_section->output_section;
2317 bed = get_elf_backend_data (output_bfd);
2318 esdo = elf_section_data (output_section);
2319 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2321 output_reldata = &esdo->rel;
2322 swap_out = bed->s->swap_reloc_out;
2324 else if (esdo->rela.hdr
2325 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2327 output_reldata = &esdo->rela;
2328 swap_out = bed->s->swap_reloca_out;
2332 (*_bfd_error_handler)
2333 (_("%B: relocation size mismatch in %B section %A"),
2334 output_bfd, input_section->owner, input_section);
2335 bfd_set_error (bfd_error_wrong_format);
2339 erel = output_reldata->hdr->contents;
2340 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2341 irela = internal_relocs;
2342 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2343 * bed->s->int_rels_per_ext_rel);
2344 while (irela < irelaend)
2346 (*swap_out) (output_bfd, irela, erel);
2347 irela += bed->s->int_rels_per_ext_rel;
2348 erel += input_rel_hdr->sh_entsize;
2351 /* Bump the counter, so that we know where to add the next set of
2353 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2358 /* Make weak undefined symbols in PIE dynamic. */
2361 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2362 struct elf_link_hash_entry *h)
2366 && h->root.type == bfd_link_hash_undefweak)
2367 return bfd_elf_link_record_dynamic_symbol (info, h);
2372 /* Fix up the flags for a symbol. This handles various cases which
2373 can only be fixed after all the input files are seen. This is
2374 currently called by both adjust_dynamic_symbol and
2375 assign_sym_version, which is unnecessary but perhaps more robust in
2376 the face of future changes. */
2379 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2380 struct elf_info_failed *eif)
2382 const struct elf_backend_data *bed;
2384 /* If this symbol was mentioned in a non-ELF file, try to set
2385 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2386 permit a non-ELF file to correctly refer to a symbol defined in
2387 an ELF dynamic object. */
2390 while (h->root.type == bfd_link_hash_indirect)
2391 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2393 if (h->root.type != bfd_link_hash_defined
2394 && h->root.type != bfd_link_hash_defweak)
2397 h->ref_regular_nonweak = 1;
2401 if (h->root.u.def.section->owner != NULL
2402 && (bfd_get_flavour (h->root.u.def.section->owner)
2403 == bfd_target_elf_flavour))
2406 h->ref_regular_nonweak = 1;
2412 if (h->dynindx == -1
2416 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2425 /* Unfortunately, NON_ELF is only correct if the symbol
2426 was first seen in a non-ELF file. Fortunately, if the symbol
2427 was first seen in an ELF file, we're probably OK unless the
2428 symbol was defined in a non-ELF file. Catch that case here.
2429 FIXME: We're still in trouble if the symbol was first seen in
2430 a dynamic object, and then later in a non-ELF regular object. */
2431 if ((h->root.type == bfd_link_hash_defined
2432 || h->root.type == bfd_link_hash_defweak)
2434 && (h->root.u.def.section->owner != NULL
2435 ? (bfd_get_flavour (h->root.u.def.section->owner)
2436 != bfd_target_elf_flavour)
2437 : (bfd_is_abs_section (h->root.u.def.section)
2438 && !h->def_dynamic)))
2442 /* Backend specific symbol fixup. */
2443 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2444 if (bed->elf_backend_fixup_symbol
2445 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2448 /* If this is a final link, and the symbol was defined as a common
2449 symbol in a regular object file, and there was no definition in
2450 any dynamic object, then the linker will have allocated space for
2451 the symbol in a common section but the DEF_REGULAR
2452 flag will not have been set. */
2453 if (h->root.type == bfd_link_hash_defined
2457 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2460 /* If -Bsymbolic was used (which means to bind references to global
2461 symbols to the definition within the shared object), and this
2462 symbol was defined in a regular object, then it actually doesn't
2463 need a PLT entry. Likewise, if the symbol has non-default
2464 visibility. If the symbol has hidden or internal visibility, we
2465 will force it local. */
2467 && eif->info->shared
2468 && is_elf_hash_table (eif->info->hash)
2469 && (SYMBOLIC_BIND (eif->info, h)
2470 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2473 bfd_boolean force_local;
2475 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2476 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2477 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2480 /* If a weak undefined symbol has non-default visibility, we also
2481 hide it from the dynamic linker. */
2482 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2483 && h->root.type == bfd_link_hash_undefweak)
2484 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2486 /* If this is a weak defined symbol in a dynamic object, and we know
2487 the real definition in the dynamic object, copy interesting flags
2488 over to the real definition. */
2489 if (h->u.weakdef != NULL)
2491 /* If the real definition is defined by a regular object file,
2492 don't do anything special. See the longer description in
2493 _bfd_elf_adjust_dynamic_symbol, below. */
2494 if (h->u.weakdef->def_regular)
2495 h->u.weakdef = NULL;
2498 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2500 while (h->root.type == bfd_link_hash_indirect)
2501 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2503 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2504 || h->root.type == bfd_link_hash_defweak);
2505 BFD_ASSERT (weakdef->def_dynamic);
2506 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2507 || weakdef->root.type == bfd_link_hash_defweak);
2508 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2515 /* Make the backend pick a good value for a dynamic symbol. This is
2516 called via elf_link_hash_traverse, and also calls itself
2520 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2522 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2524 const struct elf_backend_data *bed;
2526 if (! is_elf_hash_table (eif->info->hash))
2529 /* Ignore indirect symbols. These are added by the versioning code. */
2530 if (h->root.type == bfd_link_hash_indirect)
2533 /* Fix the symbol flags. */
2534 if (! _bfd_elf_fix_symbol_flags (h, eif))
2537 /* If this symbol does not require a PLT entry, and it is not
2538 defined by a dynamic object, or is not referenced by a regular
2539 object, ignore it. We do have to handle a weak defined symbol,
2540 even if no regular object refers to it, if we decided to add it
2541 to the dynamic symbol table. FIXME: Do we normally need to worry
2542 about symbols which are defined by one dynamic object and
2543 referenced by another one? */
2545 && h->type != STT_GNU_IFUNC
2549 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2551 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2555 /* If we've already adjusted this symbol, don't do it again. This
2556 can happen via a recursive call. */
2557 if (h->dynamic_adjusted)
2560 /* Don't look at this symbol again. Note that we must set this
2561 after checking the above conditions, because we may look at a
2562 symbol once, decide not to do anything, and then get called
2563 recursively later after REF_REGULAR is set below. */
2564 h->dynamic_adjusted = 1;
2566 /* If this is a weak definition, and we know a real definition, and
2567 the real symbol is not itself defined by a regular object file,
2568 then get a good value for the real definition. We handle the
2569 real symbol first, for the convenience of the backend routine.
2571 Note that there is a confusing case here. If the real definition
2572 is defined by a regular object file, we don't get the real symbol
2573 from the dynamic object, but we do get the weak symbol. If the
2574 processor backend uses a COPY reloc, then if some routine in the
2575 dynamic object changes the real symbol, we will not see that
2576 change in the corresponding weak symbol. This is the way other
2577 ELF linkers work as well, and seems to be a result of the shared
2580 I will clarify this issue. Most SVR4 shared libraries define the
2581 variable _timezone and define timezone as a weak synonym. The
2582 tzset call changes _timezone. If you write
2583 extern int timezone;
2585 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2586 you might expect that, since timezone is a synonym for _timezone,
2587 the same number will print both times. However, if the processor
2588 backend uses a COPY reloc, then actually timezone will be copied
2589 into your process image, and, since you define _timezone
2590 yourself, _timezone will not. Thus timezone and _timezone will
2591 wind up at different memory locations. The tzset call will set
2592 _timezone, leaving timezone unchanged. */
2594 if (h->u.weakdef != NULL)
2596 /* If we get to this point, there is an implicit reference to
2597 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2598 h->u.weakdef->ref_regular = 1;
2600 /* Ensure that the backend adjust_dynamic_symbol function sees
2601 H->U.WEAKDEF before H by recursively calling ourselves. */
2602 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2606 /* If a symbol has no type and no size and does not require a PLT
2607 entry, then we are probably about to do the wrong thing here: we
2608 are probably going to create a COPY reloc for an empty object.
2609 This case can arise when a shared object is built with assembly
2610 code, and the assembly code fails to set the symbol type. */
2612 && h->type == STT_NOTYPE
2614 (*_bfd_error_handler)
2615 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2616 h->root.root.string);
2618 dynobj = elf_hash_table (eif->info)->dynobj;
2619 bed = get_elf_backend_data (dynobj);
2621 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2630 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2634 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info,
2635 struct elf_link_hash_entry *h,
2638 unsigned int power_of_two;
2640 asection *sec = h->root.u.def.section;
2642 /* The section aligment of definition is the maximum alignment
2643 requirement of symbols defined in the section. Since we don't
2644 know the symbol alignment requirement, we start with the
2645 maximum alignment and check low bits of the symbol address
2646 for the minimum alignment. */
2647 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2648 mask = ((bfd_vma) 1 << power_of_two) - 1;
2649 while ((h->root.u.def.value & mask) != 0)
2655 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2658 /* Adjust the section alignment if needed. */
2659 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2664 /* We make sure that the symbol will be aligned properly. */
2665 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2667 /* Define the symbol as being at this point in DYNBSS. */
2668 h->root.u.def.section = dynbss;
2669 h->root.u.def.value = dynbss->size;
2671 /* Increment the size of DYNBSS to make room for the symbol. */
2672 dynbss->size += h->size;
2674 /* No error if extern_protected_data is true. */
2675 if (h->protected_def
2676 && !get_elf_backend_data (dynbss->owner)->extern_protected_data)
2678 info->callbacks->einfo
2679 (_("%P: copy reloc against protected `%T' is invalid\n"),
2680 h->root.root.string);
2681 bfd_set_error (bfd_error_bad_value);
2688 /* Adjust all external symbols pointing into SEC_MERGE sections
2689 to reflect the object merging within the sections. */
2692 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2696 if ((h->root.type == bfd_link_hash_defined
2697 || h->root.type == bfd_link_hash_defweak)
2698 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2699 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2701 bfd *output_bfd = (bfd *) data;
2703 h->root.u.def.value =
2704 _bfd_merged_section_offset (output_bfd,
2705 &h->root.u.def.section,
2706 elf_section_data (sec)->sec_info,
2707 h->root.u.def.value);
2713 /* Returns false if the symbol referred to by H should be considered
2714 to resolve local to the current module, and true if it should be
2715 considered to bind dynamically. */
2718 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2719 struct bfd_link_info *info,
2720 bfd_boolean not_local_protected)
2722 bfd_boolean binding_stays_local_p;
2723 const struct elf_backend_data *bed;
2724 struct elf_link_hash_table *hash_table;
2729 while (h->root.type == bfd_link_hash_indirect
2730 || h->root.type == bfd_link_hash_warning)
2731 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2733 /* If it was forced local, then clearly it's not dynamic. */
2734 if (h->dynindx == -1)
2736 if (h->forced_local)
2739 /* Identify the cases where name binding rules say that a
2740 visible symbol resolves locally. */
2741 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2743 switch (ELF_ST_VISIBILITY (h->other))
2750 hash_table = elf_hash_table (info);
2751 if (!is_elf_hash_table (hash_table))
2754 bed = get_elf_backend_data (hash_table->dynobj);
2756 /* Proper resolution for function pointer equality may require
2757 that these symbols perhaps be resolved dynamically, even though
2758 we should be resolving them to the current module. */
2759 if (!not_local_protected || !bed->is_function_type (h->type))
2760 binding_stays_local_p = TRUE;
2767 /* If it isn't defined locally, then clearly it's dynamic. */
2768 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2771 /* Otherwise, the symbol is dynamic if binding rules don't tell
2772 us that it remains local. */
2773 return !binding_stays_local_p;
2776 /* Return true if the symbol referred to by H should be considered
2777 to resolve local to the current module, and false otherwise. Differs
2778 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2779 undefined symbols. The two functions are virtually identical except
2780 for the place where forced_local and dynindx == -1 are tested. If
2781 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2782 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2783 the symbol is local only for defined symbols.
2784 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2785 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2786 treatment of undefined weak symbols. For those that do not make
2787 undefined weak symbols dynamic, both functions may return false. */
2790 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2791 struct bfd_link_info *info,
2792 bfd_boolean local_protected)
2794 const struct elf_backend_data *bed;
2795 struct elf_link_hash_table *hash_table;
2797 /* If it's a local sym, of course we resolve locally. */
2801 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2802 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2803 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2806 /* Common symbols that become definitions don't get the DEF_REGULAR
2807 flag set, so test it first, and don't bail out. */
2808 if (ELF_COMMON_DEF_P (h))
2810 /* If we don't have a definition in a regular file, then we can't
2811 resolve locally. The sym is either undefined or dynamic. */
2812 else if (!h->def_regular)
2815 /* Forced local symbols resolve locally. */
2816 if (h->forced_local)
2819 /* As do non-dynamic symbols. */
2820 if (h->dynindx == -1)
2823 /* At this point, we know the symbol is defined and dynamic. In an
2824 executable it must resolve locally, likewise when building symbolic
2825 shared libraries. */
2826 if (info->executable || SYMBOLIC_BIND (info, h))
2829 /* Now deal with defined dynamic symbols in shared libraries. Ones
2830 with default visibility might not resolve locally. */
2831 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2834 hash_table = elf_hash_table (info);
2835 if (!is_elf_hash_table (hash_table))
2838 bed = get_elf_backend_data (hash_table->dynobj);
2840 /* If extern_protected_data is false, STV_PROTECTED non-function
2841 symbols are local. */
2842 if (!bed->extern_protected_data && !bed->is_function_type (h->type))
2845 /* Function pointer equality tests may require that STV_PROTECTED
2846 symbols be treated as dynamic symbols. If the address of a
2847 function not defined in an executable is set to that function's
2848 plt entry in the executable, then the address of the function in
2849 a shared library must also be the plt entry in the executable. */
2850 return local_protected;
2853 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2854 aligned. Returns the first TLS output section. */
2856 struct bfd_section *
2857 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2859 struct bfd_section *sec, *tls;
2860 unsigned int align = 0;
2862 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2863 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2867 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2868 if (sec->alignment_power > align)
2869 align = sec->alignment_power;
2871 elf_hash_table (info)->tls_sec = tls;
2873 /* Ensure the alignment of the first section is the largest alignment,
2874 so that the tls segment starts aligned. */
2876 tls->alignment_power = align;
2881 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2883 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2884 Elf_Internal_Sym *sym)
2886 const struct elf_backend_data *bed;
2888 /* Local symbols do not count, but target specific ones might. */
2889 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2890 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2893 bed = get_elf_backend_data (abfd);
2894 /* Function symbols do not count. */
2895 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2898 /* If the section is undefined, then so is the symbol. */
2899 if (sym->st_shndx == SHN_UNDEF)
2902 /* If the symbol is defined in the common section, then
2903 it is a common definition and so does not count. */
2904 if (bed->common_definition (sym))
2907 /* If the symbol is in a target specific section then we
2908 must rely upon the backend to tell us what it is. */
2909 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2910 /* FIXME - this function is not coded yet:
2912 return _bfd_is_global_symbol_definition (abfd, sym);
2914 Instead for now assume that the definition is not global,
2915 Even if this is wrong, at least the linker will behave
2916 in the same way that it used to do. */
2922 /* Search the symbol table of the archive element of the archive ABFD
2923 whose archive map contains a mention of SYMDEF, and determine if
2924 the symbol is defined in this element. */
2926 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2928 Elf_Internal_Shdr * hdr;
2929 bfd_size_type symcount;
2930 bfd_size_type extsymcount;
2931 bfd_size_type extsymoff;
2932 Elf_Internal_Sym *isymbuf;
2933 Elf_Internal_Sym *isym;
2934 Elf_Internal_Sym *isymend;
2937 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2941 if (! bfd_check_format (abfd, bfd_object))
2944 /* Select the appropriate symbol table. */
2945 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2946 hdr = &elf_tdata (abfd)->symtab_hdr;
2948 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2950 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2952 /* The sh_info field of the symtab header tells us where the
2953 external symbols start. We don't care about the local symbols. */
2954 if (elf_bad_symtab (abfd))
2956 extsymcount = symcount;
2961 extsymcount = symcount - hdr->sh_info;
2962 extsymoff = hdr->sh_info;
2965 if (extsymcount == 0)
2968 /* Read in the symbol table. */
2969 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2971 if (isymbuf == NULL)
2974 /* Scan the symbol table looking for SYMDEF. */
2976 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
2980 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
2985 if (strcmp (name, symdef->name) == 0)
2987 result = is_global_data_symbol_definition (abfd, isym);
2997 /* Add an entry to the .dynamic table. */
3000 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3004 struct elf_link_hash_table *hash_table;
3005 const struct elf_backend_data *bed;
3007 bfd_size_type newsize;
3008 bfd_byte *newcontents;
3009 Elf_Internal_Dyn dyn;
3011 hash_table = elf_hash_table (info);
3012 if (! is_elf_hash_table (hash_table))
3015 bed = get_elf_backend_data (hash_table->dynobj);
3016 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3017 BFD_ASSERT (s != NULL);
3019 newsize = s->size + bed->s->sizeof_dyn;
3020 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3021 if (newcontents == NULL)
3025 dyn.d_un.d_val = val;
3026 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3029 s->contents = newcontents;
3034 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3035 otherwise just check whether one already exists. Returns -1 on error,
3036 1 if a DT_NEEDED tag already exists, and 0 on success. */
3039 elf_add_dt_needed_tag (bfd *abfd,
3040 struct bfd_link_info *info,
3044 struct elf_link_hash_table *hash_table;
3045 bfd_size_type strindex;
3047 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3050 hash_table = elf_hash_table (info);
3051 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3052 if (strindex == (bfd_size_type) -1)
3055 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3058 const struct elf_backend_data *bed;
3061 bed = get_elf_backend_data (hash_table->dynobj);
3062 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3064 for (extdyn = sdyn->contents;
3065 extdyn < sdyn->contents + sdyn->size;
3066 extdyn += bed->s->sizeof_dyn)
3068 Elf_Internal_Dyn dyn;
3070 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3071 if (dyn.d_tag == DT_NEEDED
3072 && dyn.d_un.d_val == strindex)
3074 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3082 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3085 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3089 /* We were just checking for existence of the tag. */
3090 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3096 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3098 for (; needed != NULL; needed = needed->next)
3099 if ((elf_dyn_lib_class (needed->by) & DYN_AS_NEEDED) == 0
3100 && strcmp (soname, needed->name) == 0)
3106 /* Sort symbol by value, section, and size. */
3108 elf_sort_symbol (const void *arg1, const void *arg2)
3110 const struct elf_link_hash_entry *h1;
3111 const struct elf_link_hash_entry *h2;
3112 bfd_signed_vma vdiff;
3114 h1 = *(const struct elf_link_hash_entry **) arg1;
3115 h2 = *(const struct elf_link_hash_entry **) arg2;
3116 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3118 return vdiff > 0 ? 1 : -1;
3121 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3123 return sdiff > 0 ? 1 : -1;
3125 vdiff = h1->size - h2->size;
3126 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3129 /* This function is used to adjust offsets into .dynstr for
3130 dynamic symbols. This is called via elf_link_hash_traverse. */
3133 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3135 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3137 if (h->dynindx != -1)
3138 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3142 /* Assign string offsets in .dynstr, update all structures referencing
3146 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3148 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3149 struct elf_link_local_dynamic_entry *entry;
3150 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3151 bfd *dynobj = hash_table->dynobj;
3154 const struct elf_backend_data *bed;
3157 _bfd_elf_strtab_finalize (dynstr);
3158 size = _bfd_elf_strtab_size (dynstr);
3160 bed = get_elf_backend_data (dynobj);
3161 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3162 BFD_ASSERT (sdyn != NULL);
3164 /* Update all .dynamic entries referencing .dynstr strings. */
3165 for (extdyn = sdyn->contents;
3166 extdyn < sdyn->contents + sdyn->size;
3167 extdyn += bed->s->sizeof_dyn)
3169 Elf_Internal_Dyn dyn;
3171 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3175 dyn.d_un.d_val = size;
3185 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3190 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3193 /* Now update local dynamic symbols. */
3194 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3195 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3196 entry->isym.st_name);
3198 /* And the rest of dynamic symbols. */
3199 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3201 /* Adjust version definitions. */
3202 if (elf_tdata (output_bfd)->cverdefs)
3207 Elf_Internal_Verdef def;
3208 Elf_Internal_Verdaux defaux;
3210 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3214 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3216 p += sizeof (Elf_External_Verdef);
3217 if (def.vd_aux != sizeof (Elf_External_Verdef))
3219 for (i = 0; i < def.vd_cnt; ++i)
3221 _bfd_elf_swap_verdaux_in (output_bfd,
3222 (Elf_External_Verdaux *) p, &defaux);
3223 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3225 _bfd_elf_swap_verdaux_out (output_bfd,
3226 &defaux, (Elf_External_Verdaux *) p);
3227 p += sizeof (Elf_External_Verdaux);
3230 while (def.vd_next);
3233 /* Adjust version references. */
3234 if (elf_tdata (output_bfd)->verref)
3239 Elf_Internal_Verneed need;
3240 Elf_Internal_Vernaux needaux;
3242 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3246 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3248 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3249 _bfd_elf_swap_verneed_out (output_bfd, &need,
3250 (Elf_External_Verneed *) p);
3251 p += sizeof (Elf_External_Verneed);
3252 for (i = 0; i < need.vn_cnt; ++i)
3254 _bfd_elf_swap_vernaux_in (output_bfd,
3255 (Elf_External_Vernaux *) p, &needaux);
3256 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3258 _bfd_elf_swap_vernaux_out (output_bfd,
3260 (Elf_External_Vernaux *) p);
3261 p += sizeof (Elf_External_Vernaux);
3264 while (need.vn_next);
3270 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3271 The default is to only match when the INPUT and OUTPUT are exactly
3275 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3276 const bfd_target *output)
3278 return input == output;
3281 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3282 This version is used when different targets for the same architecture
3283 are virtually identical. */
3286 _bfd_elf_relocs_compatible (const bfd_target *input,
3287 const bfd_target *output)
3289 const struct elf_backend_data *obed, *ibed;
3291 if (input == output)
3294 ibed = xvec_get_elf_backend_data (input);
3295 obed = xvec_get_elf_backend_data (output);
3297 if (ibed->arch != obed->arch)
3300 /* If both backends are using this function, deem them compatible. */
3301 return ibed->relocs_compatible == obed->relocs_compatible;
3304 /* Make a special call to the linker "notice" function to tell it that
3305 we are about to handle an as-needed lib, or have finished
3306 processing the lib. */
3309 _bfd_elf_notice_as_needed (bfd *ibfd,
3310 struct bfd_link_info *info,
3311 enum notice_asneeded_action act)
3313 return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
3316 /* Add symbols from an ELF object file to the linker hash table. */
3319 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3321 Elf_Internal_Ehdr *ehdr;
3322 Elf_Internal_Shdr *hdr;
3323 bfd_size_type symcount;
3324 bfd_size_type extsymcount;
3325 bfd_size_type extsymoff;
3326 struct elf_link_hash_entry **sym_hash;
3327 bfd_boolean dynamic;
3328 Elf_External_Versym *extversym = NULL;
3329 Elf_External_Versym *ever;
3330 struct elf_link_hash_entry *weaks;
3331 struct elf_link_hash_entry **nondeflt_vers = NULL;
3332 bfd_size_type nondeflt_vers_cnt = 0;
3333 Elf_Internal_Sym *isymbuf = NULL;
3334 Elf_Internal_Sym *isym;
3335 Elf_Internal_Sym *isymend;
3336 const struct elf_backend_data *bed;
3337 bfd_boolean add_needed;
3338 struct elf_link_hash_table *htab;
3340 void *alloc_mark = NULL;
3341 struct bfd_hash_entry **old_table = NULL;
3342 unsigned int old_size = 0;
3343 unsigned int old_count = 0;
3344 void *old_tab = NULL;
3346 struct bfd_link_hash_entry *old_undefs = NULL;
3347 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3348 long old_dynsymcount = 0;
3349 bfd_size_type old_dynstr_size = 0;
3352 bfd_boolean just_syms;
3354 htab = elf_hash_table (info);
3355 bed = get_elf_backend_data (abfd);
3357 if ((abfd->flags & DYNAMIC) == 0)
3363 /* You can't use -r against a dynamic object. Also, there's no
3364 hope of using a dynamic object which does not exactly match
3365 the format of the output file. */
3366 if (info->relocatable
3367 || !is_elf_hash_table (htab)
3368 || info->output_bfd->xvec != abfd->xvec)
3370 if (info->relocatable)
3371 bfd_set_error (bfd_error_invalid_operation);
3373 bfd_set_error (bfd_error_wrong_format);
3378 ehdr = elf_elfheader (abfd);
3379 if (info->warn_alternate_em
3380 && bed->elf_machine_code != ehdr->e_machine
3381 && ((bed->elf_machine_alt1 != 0
3382 && ehdr->e_machine == bed->elf_machine_alt1)
3383 || (bed->elf_machine_alt2 != 0
3384 && ehdr->e_machine == bed->elf_machine_alt2)))
3385 info->callbacks->einfo
3386 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3387 ehdr->e_machine, abfd, bed->elf_machine_code);
3389 /* As a GNU extension, any input sections which are named
3390 .gnu.warning.SYMBOL are treated as warning symbols for the given
3391 symbol. This differs from .gnu.warning sections, which generate
3392 warnings when they are included in an output file. */
3393 /* PR 12761: Also generate this warning when building shared libraries. */
3394 for (s = abfd->sections; s != NULL; s = s->next)
3398 name = bfd_get_section_name (abfd, s);
3399 if (CONST_STRNEQ (name, ".gnu.warning."))
3404 name += sizeof ".gnu.warning." - 1;
3406 /* If this is a shared object, then look up the symbol
3407 in the hash table. If it is there, and it is already
3408 been defined, then we will not be using the entry
3409 from this shared object, so we don't need to warn.
3410 FIXME: If we see the definition in a regular object
3411 later on, we will warn, but we shouldn't. The only
3412 fix is to keep track of what warnings we are supposed
3413 to emit, and then handle them all at the end of the
3417 struct elf_link_hash_entry *h;
3419 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3421 /* FIXME: What about bfd_link_hash_common? */
3423 && (h->root.type == bfd_link_hash_defined
3424 || h->root.type == bfd_link_hash_defweak))
3429 msg = (char *) bfd_alloc (abfd, sz + 1);
3433 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3438 if (! (_bfd_generic_link_add_one_symbol
3439 (info, abfd, name, BSF_WARNING, s, 0, msg,
3440 FALSE, bed->collect, NULL)))
3443 if (!info->relocatable && info->executable)
3445 /* Clobber the section size so that the warning does
3446 not get copied into the output file. */
3449 /* Also set SEC_EXCLUDE, so that symbols defined in
3450 the warning section don't get copied to the output. */
3451 s->flags |= SEC_EXCLUDE;
3456 just_syms = ((s = abfd->sections) != NULL
3457 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);
3462 /* If we are creating a shared library, create all the dynamic
3463 sections immediately. We need to attach them to something,
3464 so we attach them to this BFD, provided it is the right
3465 format and is not from ld --just-symbols. FIXME: If there
3466 are no input BFD's of the same format as the output, we can't
3467 make a shared library. */
3470 && is_elf_hash_table (htab)
3471 && info->output_bfd->xvec == abfd->xvec
3472 && !htab->dynamic_sections_created)
3474 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3478 else if (!is_elf_hash_table (htab))
3482 const char *soname = NULL;
3484 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3487 /* ld --just-symbols and dynamic objects don't mix very well.
3488 ld shouldn't allow it. */
3492 /* If this dynamic lib was specified on the command line with
3493 --as-needed in effect, then we don't want to add a DT_NEEDED
3494 tag unless the lib is actually used. Similary for libs brought
3495 in by another lib's DT_NEEDED. When --no-add-needed is used
3496 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3497 any dynamic library in DT_NEEDED tags in the dynamic lib at
3499 add_needed = (elf_dyn_lib_class (abfd)
3500 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3501 | DYN_NO_NEEDED)) == 0;
3503 s = bfd_get_section_by_name (abfd, ".dynamic");
3508 unsigned int elfsec;
3509 unsigned long shlink;
3511 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3518 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3519 if (elfsec == SHN_BAD)
3520 goto error_free_dyn;
3521 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3523 for (extdyn = dynbuf;
3524 extdyn < dynbuf + s->size;
3525 extdyn += bed->s->sizeof_dyn)
3527 Elf_Internal_Dyn dyn;
3529 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3530 if (dyn.d_tag == DT_SONAME)
3532 unsigned int tagv = dyn.d_un.d_val;
3533 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3535 goto error_free_dyn;
3537 if (dyn.d_tag == DT_NEEDED)
3539 struct bfd_link_needed_list *n, **pn;
3541 unsigned int tagv = dyn.d_un.d_val;
3543 amt = sizeof (struct bfd_link_needed_list);
3544 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3545 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3546 if (n == NULL || fnm == NULL)
3547 goto error_free_dyn;
3548 amt = strlen (fnm) + 1;
3549 anm = (char *) bfd_alloc (abfd, amt);
3551 goto error_free_dyn;
3552 memcpy (anm, fnm, amt);
3556 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3560 if (dyn.d_tag == DT_RUNPATH)
3562 struct bfd_link_needed_list *n, **pn;
3564 unsigned int tagv = dyn.d_un.d_val;
3566 amt = sizeof (struct bfd_link_needed_list);
3567 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3568 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3569 if (n == NULL || fnm == NULL)
3570 goto error_free_dyn;
3571 amt = strlen (fnm) + 1;
3572 anm = (char *) bfd_alloc (abfd, amt);
3574 goto error_free_dyn;
3575 memcpy (anm, fnm, amt);
3579 for (pn = & runpath;
3585 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3586 if (!runpath && dyn.d_tag == DT_RPATH)
3588 struct bfd_link_needed_list *n, **pn;
3590 unsigned int tagv = dyn.d_un.d_val;
3592 amt = sizeof (struct bfd_link_needed_list);
3593 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3594 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3595 if (n == NULL || fnm == NULL)
3596 goto error_free_dyn;
3597 amt = strlen (fnm) + 1;
3598 anm = (char *) bfd_alloc (abfd, amt);
3600 goto error_free_dyn;
3601 memcpy (anm, fnm, amt);
3611 if (dyn.d_tag == DT_AUDIT)
3613 unsigned int tagv = dyn.d_un.d_val;
3614 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3621 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3622 frees all more recently bfd_alloc'd blocks as well. */
3628 struct bfd_link_needed_list **pn;
3629 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3634 /* We do not want to include any of the sections in a dynamic
3635 object in the output file. We hack by simply clobbering the
3636 list of sections in the BFD. This could be handled more
3637 cleanly by, say, a new section flag; the existing
3638 SEC_NEVER_LOAD flag is not the one we want, because that one
3639 still implies that the section takes up space in the output
3641 bfd_section_list_clear (abfd);
3643 /* Find the name to use in a DT_NEEDED entry that refers to this
3644 object. If the object has a DT_SONAME entry, we use it.
3645 Otherwise, if the generic linker stuck something in
3646 elf_dt_name, we use that. Otherwise, we just use the file
3648 if (soname == NULL || *soname == '\0')
3650 soname = elf_dt_name (abfd);
3651 if (soname == NULL || *soname == '\0')
3652 soname = bfd_get_filename (abfd);
3655 /* Save the SONAME because sometimes the linker emulation code
3656 will need to know it. */
3657 elf_dt_name (abfd) = soname;
3659 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3663 /* If we have already included this dynamic object in the
3664 link, just ignore it. There is no reason to include a
3665 particular dynamic object more than once. */
3669 /* Save the DT_AUDIT entry for the linker emulation code. */
3670 elf_dt_audit (abfd) = audit;
3673 /* If this is a dynamic object, we always link against the .dynsym
3674 symbol table, not the .symtab symbol table. The dynamic linker
3675 will only see the .dynsym symbol table, so there is no reason to
3676 look at .symtab for a dynamic object. */
3678 if (! dynamic || elf_dynsymtab (abfd) == 0)
3679 hdr = &elf_tdata (abfd)->symtab_hdr;
3681 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3683 symcount = hdr->sh_size / bed->s->sizeof_sym;
3685 /* The sh_info field of the symtab header tells us where the
3686 external symbols start. We don't care about the local symbols at
3688 if (elf_bad_symtab (abfd))
3690 extsymcount = symcount;
3695 extsymcount = symcount - hdr->sh_info;
3696 extsymoff = hdr->sh_info;
3699 sym_hash = elf_sym_hashes (abfd);
3700 if (extsymcount != 0)
3702 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3704 if (isymbuf == NULL)
3707 if (sym_hash == NULL)
3709 /* We store a pointer to the hash table entry for each
3711 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3712 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
3713 if (sym_hash == NULL)
3714 goto error_free_sym;
3715 elf_sym_hashes (abfd) = sym_hash;
3721 /* Read in any version definitions. */
3722 if (!_bfd_elf_slurp_version_tables (abfd,
3723 info->default_imported_symver))
3724 goto error_free_sym;
3726 /* Read in the symbol versions, but don't bother to convert them
3727 to internal format. */
3728 if (elf_dynversym (abfd) != 0)
3730 Elf_Internal_Shdr *versymhdr;
3732 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3733 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3734 if (extversym == NULL)
3735 goto error_free_sym;
3736 amt = versymhdr->sh_size;
3737 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3738 || bfd_bread (extversym, amt, abfd) != amt)
3739 goto error_free_vers;
3743 /* If we are loading an as-needed shared lib, save the symbol table
3744 state before we start adding symbols. If the lib turns out
3745 to be unneeded, restore the state. */
3746 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3751 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3753 struct bfd_hash_entry *p;
3754 struct elf_link_hash_entry *h;
3756 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3758 h = (struct elf_link_hash_entry *) p;
3759 entsize += htab->root.table.entsize;
3760 if (h->root.type == bfd_link_hash_warning)
3761 entsize += htab->root.table.entsize;
3765 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3766 old_tab = bfd_malloc (tabsize + entsize);
3767 if (old_tab == NULL)
3768 goto error_free_vers;
3770 /* Remember the current objalloc pointer, so that all mem for
3771 symbols added can later be reclaimed. */
3772 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3773 if (alloc_mark == NULL)
3774 goto error_free_vers;
3776 /* Make a special call to the linker "notice" function to
3777 tell it that we are about to handle an as-needed lib. */
3778 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
3779 goto error_free_vers;
3781 /* Clone the symbol table. Remember some pointers into the
3782 symbol table, and dynamic symbol count. */
3783 old_ent = (char *) old_tab + tabsize;
3784 memcpy (old_tab, htab->root.table.table, tabsize);
3785 old_undefs = htab->root.undefs;
3786 old_undefs_tail = htab->root.undefs_tail;
3787 old_table = htab->root.table.table;
3788 old_size = htab->root.table.size;
3789 old_count = htab->root.table.count;
3790 old_dynsymcount = htab->dynsymcount;
3791 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
3793 for (i = 0; i < htab->root.table.size; i++)
3795 struct bfd_hash_entry *p;
3796 struct elf_link_hash_entry *h;
3798 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3800 memcpy (old_ent, p, htab->root.table.entsize);
3801 old_ent = (char *) old_ent + htab->root.table.entsize;
3802 h = (struct elf_link_hash_entry *) p;
3803 if (h->root.type == bfd_link_hash_warning)
3805 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3806 old_ent = (char *) old_ent + htab->root.table.entsize;
3813 ever = extversym != NULL ? extversym + extsymoff : NULL;
3814 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3816 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3820 asection *sec, *new_sec;
3823 struct elf_link_hash_entry *h;
3824 struct elf_link_hash_entry *hi;
3825 bfd_boolean definition;
3826 bfd_boolean size_change_ok;
3827 bfd_boolean type_change_ok;
3828 bfd_boolean new_weakdef;
3829 bfd_boolean new_weak;
3830 bfd_boolean old_weak;
3831 bfd_boolean override;
3833 unsigned int old_alignment;
3838 flags = BSF_NO_FLAGS;
3840 value = isym->st_value;
3841 common = bed->common_definition (isym);
3843 bind = ELF_ST_BIND (isym->st_info);
3847 /* This should be impossible, since ELF requires that all
3848 global symbols follow all local symbols, and that sh_info
3849 point to the first global symbol. Unfortunately, Irix 5
3854 if (isym->st_shndx != SHN_UNDEF && !common)
3862 case STB_GNU_UNIQUE:
3863 flags = BSF_GNU_UNIQUE;
3867 /* Leave it up to the processor backend. */
3871 if (isym->st_shndx == SHN_UNDEF)
3872 sec = bfd_und_section_ptr;
3873 else if (isym->st_shndx == SHN_ABS)
3874 sec = bfd_abs_section_ptr;
3875 else if (isym->st_shndx == SHN_COMMON)
3877 sec = bfd_com_section_ptr;
3878 /* What ELF calls the size we call the value. What ELF
3879 calls the value we call the alignment. */
3880 value = isym->st_size;
3884 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3886 sec = bfd_abs_section_ptr;
3887 else if (discarded_section (sec))
3889 /* Symbols from discarded section are undefined. We keep
3891 sec = bfd_und_section_ptr;
3892 isym->st_shndx = SHN_UNDEF;
3894 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3898 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3901 goto error_free_vers;
3903 if (isym->st_shndx == SHN_COMMON
3904 && (abfd->flags & BFD_PLUGIN) != 0)
3906 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
3910 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
3912 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
3914 goto error_free_vers;
3918 else if (isym->st_shndx == SHN_COMMON
3919 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3920 && !info->relocatable)
3922 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3926 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
3927 | SEC_LINKER_CREATED);
3928 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
3930 goto error_free_vers;
3934 else if (bed->elf_add_symbol_hook)
3936 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3938 goto error_free_vers;
3940 /* The hook function sets the name to NULL if this symbol
3941 should be skipped for some reason. */
3946 /* Sanity check that all possibilities were handled. */
3949 bfd_set_error (bfd_error_bad_value);
3950 goto error_free_vers;
3953 /* Silently discard TLS symbols from --just-syms. There's
3954 no way to combine a static TLS block with a new TLS block
3955 for this executable. */
3956 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
3957 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3960 if (bfd_is_und_section (sec)
3961 || bfd_is_com_section (sec))
3966 size_change_ok = FALSE;
3967 type_change_ok = bed->type_change_ok;
3973 if (is_elf_hash_table (htab))
3975 Elf_Internal_Versym iver;
3976 unsigned int vernum = 0;
3981 if (info->default_imported_symver)
3982 /* Use the default symbol version created earlier. */
3983 iver.vs_vers = elf_tdata (abfd)->cverdefs;
3988 _bfd_elf_swap_versym_in (abfd, ever, &iver);
3990 vernum = iver.vs_vers & VERSYM_VERSION;
3992 /* If this is a hidden symbol, or if it is not version
3993 1, we append the version name to the symbol name.
3994 However, we do not modify a non-hidden absolute symbol
3995 if it is not a function, because it might be the version
3996 symbol itself. FIXME: What if it isn't? */
3997 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
3999 && (!bfd_is_abs_section (sec)
4000 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4003 size_t namelen, verlen, newlen;
4006 if (isym->st_shndx != SHN_UNDEF)
4008 if (vernum > elf_tdata (abfd)->cverdefs)
4010 else if (vernum > 1)
4012 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4018 (*_bfd_error_handler)
4019 (_("%B: %s: invalid version %u (max %d)"),
4021 elf_tdata (abfd)->cverdefs);
4022 bfd_set_error (bfd_error_bad_value);
4023 goto error_free_vers;
4028 /* We cannot simply test for the number of
4029 entries in the VERNEED section since the
4030 numbers for the needed versions do not start
4032 Elf_Internal_Verneed *t;
4035 for (t = elf_tdata (abfd)->verref;
4039 Elf_Internal_Vernaux *a;
4041 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4043 if (a->vna_other == vernum)
4045 verstr = a->vna_nodename;
4054 (*_bfd_error_handler)
4055 (_("%B: %s: invalid needed version %d"),
4056 abfd, name, vernum);
4057 bfd_set_error (bfd_error_bad_value);
4058 goto error_free_vers;
4062 namelen = strlen (name);
4063 verlen = strlen (verstr);
4064 newlen = namelen + verlen + 2;
4065 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4066 && isym->st_shndx != SHN_UNDEF)
4069 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4070 if (newname == NULL)
4071 goto error_free_vers;
4072 memcpy (newname, name, namelen);
4073 p = newname + namelen;
4075 /* If this is a defined non-hidden version symbol,
4076 we add another @ to the name. This indicates the
4077 default version of the symbol. */
4078 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4079 && isym->st_shndx != SHN_UNDEF)
4081 memcpy (p, verstr, verlen + 1);
4086 /* If this symbol has default visibility and the user has
4087 requested we not re-export it, then mark it as hidden. */
4091 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4092 isym->st_other = (STV_HIDDEN
4093 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4095 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4096 sym_hash, &old_bfd, &old_weak,
4097 &old_alignment, &skip, &override,
4098 &type_change_ok, &size_change_ok))
4099 goto error_free_vers;
4108 while (h->root.type == bfd_link_hash_indirect
4109 || h->root.type == bfd_link_hash_warning)
4110 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4112 if (elf_tdata (abfd)->verdef != NULL
4115 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4118 if (! (_bfd_generic_link_add_one_symbol
4119 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4120 (struct bfd_link_hash_entry **) sym_hash)))
4121 goto error_free_vers;
4124 /* We need to make sure that indirect symbol dynamic flags are
4127 while (h->root.type == bfd_link_hash_indirect
4128 || h->root.type == bfd_link_hash_warning)
4129 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4133 new_weak = (flags & BSF_WEAK) != 0;
4134 new_weakdef = FALSE;
4138 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4139 && is_elf_hash_table (htab)
4140 && h->u.weakdef == NULL)
4142 /* Keep a list of all weak defined non function symbols from
4143 a dynamic object, using the weakdef field. Later in this
4144 function we will set the weakdef field to the correct
4145 value. We only put non-function symbols from dynamic
4146 objects on this list, because that happens to be the only
4147 time we need to know the normal symbol corresponding to a
4148 weak symbol, and the information is time consuming to
4149 figure out. If the weakdef field is not already NULL,
4150 then this symbol was already defined by some previous
4151 dynamic object, and we will be using that previous
4152 definition anyhow. */
4154 h->u.weakdef = weaks;
4159 /* Set the alignment of a common symbol. */
4160 if ((common || bfd_is_com_section (sec))
4161 && h->root.type == bfd_link_hash_common)
4166 align = bfd_log2 (isym->st_value);
4169 /* The new symbol is a common symbol in a shared object.
4170 We need to get the alignment from the section. */
4171 align = new_sec->alignment_power;
4173 if (align > old_alignment)
4174 h->root.u.c.p->alignment_power = align;
4176 h->root.u.c.p->alignment_power = old_alignment;
4179 if (is_elf_hash_table (htab))
4181 /* Set a flag in the hash table entry indicating the type of
4182 reference or definition we just found. A dynamic symbol
4183 is one which is referenced or defined by both a regular
4184 object and a shared object. */
4185 bfd_boolean dynsym = FALSE;
4187 /* Plugin symbols aren't normal. Don't set def_regular or
4188 ref_regular for them, or make them dynamic. */
4189 if ((abfd->flags & BFD_PLUGIN) != 0)
4196 if (bind != STB_WEAK)
4197 h->ref_regular_nonweak = 1;
4209 /* If the indirect symbol has been forced local, don't
4210 make the real symbol dynamic. */
4211 if ((h == hi || !hi->forced_local)
4212 && (! info->executable
4222 hi->ref_dynamic = 1;
4227 hi->def_dynamic = 1;
4230 /* If the indirect symbol has been forced local, don't
4231 make the real symbol dynamic. */
4232 if ((h == hi || !hi->forced_local)
4235 || (h->u.weakdef != NULL
4237 && h->u.weakdef->dynindx != -1)))
4241 /* Check to see if we need to add an indirect symbol for
4242 the default name. */
4244 || (!override && h->root.type == bfd_link_hash_common))
4245 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4246 sec, value, &old_bfd, &dynsym))
4247 goto error_free_vers;
4249 /* Check the alignment when a common symbol is involved. This
4250 can change when a common symbol is overridden by a normal
4251 definition or a common symbol is ignored due to the old
4252 normal definition. We need to make sure the maximum
4253 alignment is maintained. */
4254 if ((old_alignment || common)
4255 && h->root.type != bfd_link_hash_common)
4257 unsigned int common_align;
4258 unsigned int normal_align;
4259 unsigned int symbol_align;
4263 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4264 || h->root.type == bfd_link_hash_defweak);
4266 symbol_align = ffs (h->root.u.def.value) - 1;
4267 if (h->root.u.def.section->owner != NULL
4268 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4270 normal_align = h->root.u.def.section->alignment_power;
4271 if (normal_align > symbol_align)
4272 normal_align = symbol_align;
4275 normal_align = symbol_align;
4279 common_align = old_alignment;
4280 common_bfd = old_bfd;
4285 common_align = bfd_log2 (isym->st_value);
4287 normal_bfd = old_bfd;
4290 if (normal_align < common_align)
4292 /* PR binutils/2735 */
4293 if (normal_bfd == NULL)
4294 (*_bfd_error_handler)
4295 (_("Warning: alignment %u of common symbol `%s' in %B is"
4296 " greater than the alignment (%u) of its section %A"),
4297 common_bfd, h->root.u.def.section,
4298 1 << common_align, name, 1 << normal_align);
4300 (*_bfd_error_handler)
4301 (_("Warning: alignment %u of symbol `%s' in %B"
4302 " is smaller than %u in %B"),
4303 normal_bfd, common_bfd,
4304 1 << normal_align, name, 1 << common_align);
4308 /* Remember the symbol size if it isn't undefined. */
4309 if (isym->st_size != 0
4310 && isym->st_shndx != SHN_UNDEF
4311 && (definition || h->size == 0))
4314 && h->size != isym->st_size
4315 && ! size_change_ok)
4316 (*_bfd_error_handler)
4317 (_("Warning: size of symbol `%s' changed"
4318 " from %lu in %B to %lu in %B"),
4320 name, (unsigned long) h->size,
4321 (unsigned long) isym->st_size);
4323 h->size = isym->st_size;
4326 /* If this is a common symbol, then we always want H->SIZE
4327 to be the size of the common symbol. The code just above
4328 won't fix the size if a common symbol becomes larger. We
4329 don't warn about a size change here, because that is
4330 covered by --warn-common. Allow changes between different
4332 if (h->root.type == bfd_link_hash_common)
4333 h->size = h->root.u.c.size;
4335 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4336 && ((definition && !new_weak)
4337 || (old_weak && h->root.type == bfd_link_hash_common)
4338 || h->type == STT_NOTYPE))
4340 unsigned int type = ELF_ST_TYPE (isym->st_info);
4342 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4344 if (type == STT_GNU_IFUNC
4345 && (abfd->flags & DYNAMIC) != 0)
4348 if (h->type != type)
4350 if (h->type != STT_NOTYPE && ! type_change_ok)
4351 (*_bfd_error_handler)
4352 (_("Warning: type of symbol `%s' changed"
4353 " from %d to %d in %B"),
4354 abfd, name, h->type, type);
4360 /* Merge st_other field. */
4361 elf_merge_st_other (abfd, h, isym, definition, dynamic);
4363 /* We don't want to make debug symbol dynamic. */
4364 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4367 /* Nor should we make plugin symbols dynamic. */
4368 if ((abfd->flags & BFD_PLUGIN) != 0)
4373 h->target_internal = isym->st_target_internal;
4374 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4377 if (definition && !dynamic)
4379 char *p = strchr (name, ELF_VER_CHR);
4380 if (p != NULL && p[1] != ELF_VER_CHR)
4382 /* Queue non-default versions so that .symver x, x@FOO
4383 aliases can be checked. */
4386 amt = ((isymend - isym + 1)
4387 * sizeof (struct elf_link_hash_entry *));
4389 = (struct elf_link_hash_entry **) bfd_malloc (amt);
4391 goto error_free_vers;
4393 nondeflt_vers[nondeflt_vers_cnt++] = h;
4397 if (dynsym && h->dynindx == -1)
4399 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4400 goto error_free_vers;
4401 if (h->u.weakdef != NULL
4403 && h->u.weakdef->dynindx == -1)
4405 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4406 goto error_free_vers;
4409 else if (dynsym && h->dynindx != -1)
4410 /* If the symbol already has a dynamic index, but
4411 visibility says it should not be visible, turn it into
4413 switch (ELF_ST_VISIBILITY (h->other))
4417 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4422 /* Don't add DT_NEEDED for references from the dummy bfd. */
4426 && h->ref_regular_nonweak
4428 || (old_bfd->flags & BFD_PLUGIN) == 0))
4429 || (h->ref_dynamic_nonweak
4430 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4431 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4434 const char *soname = elf_dt_name (abfd);
4436 info->callbacks->minfo ("%!", soname, old_bfd,
4437 h->root.root.string);
4439 /* A symbol from a library loaded via DT_NEEDED of some
4440 other library is referenced by a regular object.
4441 Add a DT_NEEDED entry for it. Issue an error if
4442 --no-add-needed is used and the reference was not
4445 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4447 (*_bfd_error_handler)
4448 (_("%B: undefined reference to symbol '%s'"),
4450 bfd_set_error (bfd_error_missing_dso);
4451 goto error_free_vers;
4454 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4455 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4458 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4460 goto error_free_vers;
4462 BFD_ASSERT (ret == 0);
4467 if (extversym != NULL)
4473 if (isymbuf != NULL)
4479 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4483 /* Restore the symbol table. */
4484 old_ent = (char *) old_tab + tabsize;
4485 memset (elf_sym_hashes (abfd), 0,
4486 extsymcount * sizeof (struct elf_link_hash_entry *));
4487 htab->root.table.table = old_table;
4488 htab->root.table.size = old_size;
4489 htab->root.table.count = old_count;
4490 memcpy (htab->root.table.table, old_tab, tabsize);
4491 htab->root.undefs = old_undefs;
4492 htab->root.undefs_tail = old_undefs_tail;
4493 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4494 for (i = 0; i < htab->root.table.size; i++)
4496 struct bfd_hash_entry *p;
4497 struct elf_link_hash_entry *h;
4499 unsigned int alignment_power;
4501 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4503 h = (struct elf_link_hash_entry *) p;
4504 if (h->root.type == bfd_link_hash_warning)
4505 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4506 if (h->dynindx >= old_dynsymcount
4507 && h->dynstr_index < old_dynstr_size)
4508 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4510 /* Preserve the maximum alignment and size for common
4511 symbols even if this dynamic lib isn't on DT_NEEDED
4512 since it can still be loaded at run time by another
4514 if (h->root.type == bfd_link_hash_common)
4516 size = h->root.u.c.size;
4517 alignment_power = h->root.u.c.p->alignment_power;
4522 alignment_power = 0;
4524 memcpy (p, old_ent, htab->root.table.entsize);
4525 old_ent = (char *) old_ent + htab->root.table.entsize;
4526 h = (struct elf_link_hash_entry *) p;
4527 if (h->root.type == bfd_link_hash_warning)
4529 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4530 old_ent = (char *) old_ent + htab->root.table.entsize;
4531 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4533 if (h->root.type == bfd_link_hash_common)
4535 if (size > h->root.u.c.size)
4536 h->root.u.c.size = size;
4537 if (alignment_power > h->root.u.c.p->alignment_power)
4538 h->root.u.c.p->alignment_power = alignment_power;
4543 /* Make a special call to the linker "notice" function to
4544 tell it that symbols added for crefs may need to be removed. */
4545 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4546 goto error_free_vers;
4549 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4551 if (nondeflt_vers != NULL)
4552 free (nondeflt_vers);
4556 if (old_tab != NULL)
4558 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4559 goto error_free_vers;
4564 /* Now that all the symbols from this input file are created, handle
4565 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4566 if (nondeflt_vers != NULL)
4568 bfd_size_type cnt, symidx;
4570 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4572 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4573 char *shortname, *p;
4575 p = strchr (h->root.root.string, ELF_VER_CHR);
4577 || (h->root.type != bfd_link_hash_defined
4578 && h->root.type != bfd_link_hash_defweak))
4581 amt = p - h->root.root.string;
4582 shortname = (char *) bfd_malloc (amt + 1);
4584 goto error_free_vers;
4585 memcpy (shortname, h->root.root.string, amt);
4586 shortname[amt] = '\0';
4588 hi = (struct elf_link_hash_entry *)
4589 bfd_link_hash_lookup (&htab->root, shortname,
4590 FALSE, FALSE, FALSE);
4592 && hi->root.type == h->root.type
4593 && hi->root.u.def.value == h->root.u.def.value
4594 && hi->root.u.def.section == h->root.u.def.section)
4596 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4597 hi->root.type = bfd_link_hash_indirect;
4598 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4599 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4600 sym_hash = elf_sym_hashes (abfd);
4602 for (symidx = 0; symidx < extsymcount; ++symidx)
4603 if (sym_hash[symidx] == hi)
4605 sym_hash[symidx] = h;
4611 free (nondeflt_vers);
4612 nondeflt_vers = NULL;
4615 /* Now set the weakdefs field correctly for all the weak defined
4616 symbols we found. The only way to do this is to search all the
4617 symbols. Since we only need the information for non functions in
4618 dynamic objects, that's the only time we actually put anything on
4619 the list WEAKS. We need this information so that if a regular
4620 object refers to a symbol defined weakly in a dynamic object, the
4621 real symbol in the dynamic object is also put in the dynamic
4622 symbols; we also must arrange for both symbols to point to the
4623 same memory location. We could handle the general case of symbol
4624 aliasing, but a general symbol alias can only be generated in
4625 assembler code, handling it correctly would be very time
4626 consuming, and other ELF linkers don't handle general aliasing
4630 struct elf_link_hash_entry **hpp;
4631 struct elf_link_hash_entry **hppend;
4632 struct elf_link_hash_entry **sorted_sym_hash;
4633 struct elf_link_hash_entry *h;
4636 /* Since we have to search the whole symbol list for each weak
4637 defined symbol, search time for N weak defined symbols will be
4638 O(N^2). Binary search will cut it down to O(NlogN). */
4639 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4640 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4641 if (sorted_sym_hash == NULL)
4643 sym_hash = sorted_sym_hash;
4644 hpp = elf_sym_hashes (abfd);
4645 hppend = hpp + extsymcount;
4647 for (; hpp < hppend; hpp++)
4651 && h->root.type == bfd_link_hash_defined
4652 && !bed->is_function_type (h->type))
4660 qsort (sorted_sym_hash, sym_count,
4661 sizeof (struct elf_link_hash_entry *),
4664 while (weaks != NULL)
4666 struct elf_link_hash_entry *hlook;
4669 size_t i, j, idx = 0;
4672 weaks = hlook->u.weakdef;
4673 hlook->u.weakdef = NULL;
4675 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4676 || hlook->root.type == bfd_link_hash_defweak
4677 || hlook->root.type == bfd_link_hash_common
4678 || hlook->root.type == bfd_link_hash_indirect);
4679 slook = hlook->root.u.def.section;
4680 vlook = hlook->root.u.def.value;
4686 bfd_signed_vma vdiff;
4688 h = sorted_sym_hash[idx];
4689 vdiff = vlook - h->root.u.def.value;
4696 long sdiff = slook->id - h->root.u.def.section->id;
4706 /* We didn't find a value/section match. */
4710 /* With multiple aliases, or when the weak symbol is already
4711 strongly defined, we have multiple matching symbols and
4712 the binary search above may land on any of them. Step
4713 one past the matching symbol(s). */
4716 h = sorted_sym_hash[idx];
4717 if (h->root.u.def.section != slook
4718 || h->root.u.def.value != vlook)
4722 /* Now look back over the aliases. Since we sorted by size
4723 as well as value and section, we'll choose the one with
4724 the largest size. */
4727 h = sorted_sym_hash[idx];
4729 /* Stop if value or section doesn't match. */
4730 if (h->root.u.def.section != slook
4731 || h->root.u.def.value != vlook)
4733 else if (h != hlook)
4735 hlook->u.weakdef = h;
4737 /* If the weak definition is in the list of dynamic
4738 symbols, make sure the real definition is put
4740 if (hlook->dynindx != -1 && h->dynindx == -1)
4742 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4745 free (sorted_sym_hash);
4750 /* If the real definition is in the list of dynamic
4751 symbols, make sure the weak definition is put
4752 there as well. If we don't do this, then the
4753 dynamic loader might not merge the entries for the
4754 real definition and the weak definition. */
4755 if (h->dynindx != -1 && hlook->dynindx == -1)
4757 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4758 goto err_free_sym_hash;
4765 free (sorted_sym_hash);
4768 if (bed->check_directives
4769 && !(*bed->check_directives) (abfd, info))
4772 /* If this object is the same format as the output object, and it is
4773 not a shared library, then let the backend look through the
4776 This is required to build global offset table entries and to
4777 arrange for dynamic relocs. It is not required for the
4778 particular common case of linking non PIC code, even when linking
4779 against shared libraries, but unfortunately there is no way of
4780 knowing whether an object file has been compiled PIC or not.
4781 Looking through the relocs is not particularly time consuming.
4782 The problem is that we must either (1) keep the relocs in memory,
4783 which causes the linker to require additional runtime memory or
4784 (2) read the relocs twice from the input file, which wastes time.
4785 This would be a good case for using mmap.
4787 I have no idea how to handle linking PIC code into a file of a
4788 different format. It probably can't be done. */
4790 && is_elf_hash_table (htab)
4791 && bed->check_relocs != NULL
4792 && elf_object_id (abfd) == elf_hash_table_id (htab)
4793 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4797 for (o = abfd->sections; o != NULL; o = o->next)
4799 Elf_Internal_Rela *internal_relocs;
4802 if ((o->flags & SEC_RELOC) == 0
4803 || o->reloc_count == 0
4804 || ((info->strip == strip_all || info->strip == strip_debugger)
4805 && (o->flags & SEC_DEBUGGING) != 0)
4806 || bfd_is_abs_section (o->output_section))
4809 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4811 if (internal_relocs == NULL)
4814 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4816 if (elf_section_data (o)->relocs != internal_relocs)
4817 free (internal_relocs);
4824 /* If this is a non-traditional link, try to optimize the handling
4825 of the .stab/.stabstr sections. */
4827 && ! info->traditional_format
4828 && is_elf_hash_table (htab)
4829 && (info->strip != strip_all && info->strip != strip_debugger))
4833 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4834 if (stabstr != NULL)
4836 bfd_size_type string_offset = 0;
4839 for (stab = abfd->sections; stab; stab = stab->next)
4840 if (CONST_STRNEQ (stab->name, ".stab")
4841 && (!stab->name[5] ||
4842 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4843 && (stab->flags & SEC_MERGE) == 0
4844 && !bfd_is_abs_section (stab->output_section))
4846 struct bfd_elf_section_data *secdata;
4848 secdata = elf_section_data (stab);
4849 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4850 stabstr, &secdata->sec_info,
4853 if (secdata->sec_info)
4854 stab->sec_info_type = SEC_INFO_TYPE_STABS;
4859 if (is_elf_hash_table (htab) && add_needed)
4861 /* Add this bfd to the loaded list. */
4862 struct elf_link_loaded_list *n;
4864 n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n));
4868 n->next = htab->loaded;
4875 if (old_tab != NULL)
4877 if (nondeflt_vers != NULL)
4878 free (nondeflt_vers);
4879 if (extversym != NULL)
4882 if (isymbuf != NULL)
4888 /* Return the linker hash table entry of a symbol that might be
4889 satisfied by an archive symbol. Return -1 on error. */
4891 struct elf_link_hash_entry *
4892 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4893 struct bfd_link_info *info,
4896 struct elf_link_hash_entry *h;
4900 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
4904 /* If this is a default version (the name contains @@), look up the
4905 symbol again with only one `@' as well as without the version.
4906 The effect is that references to the symbol with and without the
4907 version will be matched by the default symbol in the archive. */
4909 p = strchr (name, ELF_VER_CHR);
4910 if (p == NULL || p[1] != ELF_VER_CHR)
4913 /* First check with only one `@'. */
4914 len = strlen (name);
4915 copy = (char *) bfd_alloc (abfd, len);
4917 return (struct elf_link_hash_entry *) 0 - 1;
4919 first = p - name + 1;
4920 memcpy (copy, name, first);
4921 memcpy (copy + first, name + first + 1, len - first);
4923 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
4926 /* We also need to check references to the symbol without the
4928 copy[first - 1] = '\0';
4929 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4930 FALSE, FALSE, TRUE);
4933 bfd_release (abfd, copy);
4937 /* Add symbols from an ELF archive file to the linker hash table. We
4938 don't use _bfd_generic_link_add_archive_symbols because we need to
4939 handle versioned symbols.
4941 Fortunately, ELF archive handling is simpler than that done by
4942 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4943 oddities. In ELF, if we find a symbol in the archive map, and the
4944 symbol is currently undefined, we know that we must pull in that
4947 Unfortunately, we do have to make multiple passes over the symbol
4948 table until nothing further is resolved. */
4951 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4954 unsigned char *included = NULL;
4958 const struct elf_backend_data *bed;
4959 struct elf_link_hash_entry * (*archive_symbol_lookup)
4960 (bfd *, struct bfd_link_info *, const char *);
4962 if (! bfd_has_map (abfd))
4964 /* An empty archive is a special case. */
4965 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4967 bfd_set_error (bfd_error_no_armap);
4971 /* Keep track of all symbols we know to be already defined, and all
4972 files we know to be already included. This is to speed up the
4973 second and subsequent passes. */
4974 c = bfd_ardata (abfd)->symdef_count;
4978 amt *= sizeof (*included);
4979 included = (unsigned char *) bfd_zmalloc (amt);
4980 if (included == NULL)
4983 symdefs = bfd_ardata (abfd)->symdefs;
4984 bed = get_elf_backend_data (abfd);
4985 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
4998 symdefend = symdef + c;
4999 for (i = 0; symdef < symdefend; symdef++, i++)
5001 struct elf_link_hash_entry *h;
5003 struct bfd_link_hash_entry *undefs_tail;
5008 if (symdef->file_offset == last)
5014 h = archive_symbol_lookup (abfd, info, symdef->name);
5015 if (h == (struct elf_link_hash_entry *) 0 - 1)
5021 if (h->root.type == bfd_link_hash_common)
5023 /* We currently have a common symbol. The archive map contains
5024 a reference to this symbol, so we may want to include it. We
5025 only want to include it however, if this archive element
5026 contains a definition of the symbol, not just another common
5029 Unfortunately some archivers (including GNU ar) will put
5030 declarations of common symbols into their archive maps, as
5031 well as real definitions, so we cannot just go by the archive
5032 map alone. Instead we must read in the element's symbol
5033 table and check that to see what kind of symbol definition
5035 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5038 else if (h->root.type != bfd_link_hash_undefined)
5040 if (h->root.type != bfd_link_hash_undefweak)
5041 /* Symbol must be defined. Don't check it again. */
5046 /* We need to include this archive member. */
5047 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5048 if (element == NULL)
5051 if (! bfd_check_format (element, bfd_object))
5054 undefs_tail = info->hash->undefs_tail;
5056 if (!(*info->callbacks
5057 ->add_archive_element) (info, element, symdef->name, &element))
5059 if (!bfd_link_add_symbols (element, info))
5062 /* If there are any new undefined symbols, we need to make
5063 another pass through the archive in order to see whether
5064 they can be defined. FIXME: This isn't perfect, because
5065 common symbols wind up on undefs_tail and because an
5066 undefined symbol which is defined later on in this pass
5067 does not require another pass. This isn't a bug, but it
5068 does make the code less efficient than it could be. */
5069 if (undefs_tail != info->hash->undefs_tail)
5072 /* Look backward to mark all symbols from this object file
5073 which we have already seen in this pass. */
5077 included[mark] = TRUE;
5082 while (symdefs[mark].file_offset == symdef->file_offset);
5084 /* We mark subsequent symbols from this object file as we go
5085 on through the loop. */
5086 last = symdef->file_offset;
5096 if (included != NULL)
5101 /* Given an ELF BFD, add symbols to the global hash table as
5105 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5107 switch (bfd_get_format (abfd))
5110 return elf_link_add_object_symbols (abfd, info);
5112 return elf_link_add_archive_symbols (abfd, info);
5114 bfd_set_error (bfd_error_wrong_format);
5119 struct hash_codes_info
5121 unsigned long *hashcodes;
5125 /* This function will be called though elf_link_hash_traverse to store
5126 all hash value of the exported symbols in an array. */
5129 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5131 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5137 /* Ignore indirect symbols. These are added by the versioning code. */
5138 if (h->dynindx == -1)
5141 name = h->root.root.string;
5142 p = strchr (name, ELF_VER_CHR);
5145 alc = (char *) bfd_malloc (p - name + 1);
5151 memcpy (alc, name, p - name);
5152 alc[p - name] = '\0';
5156 /* Compute the hash value. */
5157 ha = bfd_elf_hash (name);
5159 /* Store the found hash value in the array given as the argument. */
5160 *(inf->hashcodes)++ = ha;
5162 /* And store it in the struct so that we can put it in the hash table
5164 h->u.elf_hash_value = ha;
5172 struct collect_gnu_hash_codes
5175 const struct elf_backend_data *bed;
5176 unsigned long int nsyms;
5177 unsigned long int maskbits;
5178 unsigned long int *hashcodes;
5179 unsigned long int *hashval;
5180 unsigned long int *indx;
5181 unsigned long int *counts;
5184 long int min_dynindx;
5185 unsigned long int bucketcount;
5186 unsigned long int symindx;
5187 long int local_indx;
5188 long int shift1, shift2;
5189 unsigned long int mask;
5193 /* This function will be called though elf_link_hash_traverse to store
5194 all hash value of the exported symbols in an array. */
5197 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5199 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5205 /* Ignore indirect symbols. These are added by the versioning code. */
5206 if (h->dynindx == -1)
5209 /* Ignore also local symbols and undefined symbols. */
5210 if (! (*s->bed->elf_hash_symbol) (h))
5213 name = h->root.root.string;
5214 p = strchr (name, ELF_VER_CHR);
5217 alc = (char *) bfd_malloc (p - name + 1);
5223 memcpy (alc, name, p - name);
5224 alc[p - name] = '\0';
5228 /* Compute the hash value. */
5229 ha = bfd_elf_gnu_hash (name);
5231 /* Store the found hash value in the array for compute_bucket_count,
5232 and also for .dynsym reordering purposes. */
5233 s->hashcodes[s->nsyms] = ha;
5234 s->hashval[h->dynindx] = ha;
5236 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5237 s->min_dynindx = h->dynindx;
5245 /* This function will be called though elf_link_hash_traverse to do
5246 final dynaminc symbol renumbering. */
5249 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5251 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5252 unsigned long int bucket;
5253 unsigned long int val;
5255 /* Ignore indirect symbols. */
5256 if (h->dynindx == -1)
5259 /* Ignore also local symbols and undefined symbols. */
5260 if (! (*s->bed->elf_hash_symbol) (h))
5262 if (h->dynindx >= s->min_dynindx)
5263 h->dynindx = s->local_indx++;
5267 bucket = s->hashval[h->dynindx] % s->bucketcount;
5268 val = (s->hashval[h->dynindx] >> s->shift1)
5269 & ((s->maskbits >> s->shift1) - 1);
5270 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5272 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5273 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5274 if (s->counts[bucket] == 1)
5275 /* Last element terminates the chain. */
5277 bfd_put_32 (s->output_bfd, val,
5278 s->contents + (s->indx[bucket] - s->symindx) * 4);
5279 --s->counts[bucket];
5280 h->dynindx = s->indx[bucket]++;
5284 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5287 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5289 return !(h->forced_local
5290 || h->root.type == bfd_link_hash_undefined
5291 || h->root.type == bfd_link_hash_undefweak
5292 || ((h->root.type == bfd_link_hash_defined
5293 || h->root.type == bfd_link_hash_defweak)
5294 && h->root.u.def.section->output_section == NULL));
5297 /* Array used to determine the number of hash table buckets to use
5298 based on the number of symbols there are. If there are fewer than
5299 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5300 fewer than 37 we use 17 buckets, and so forth. We never use more
5301 than 32771 buckets. */
5303 static const size_t elf_buckets[] =
5305 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5309 /* Compute bucket count for hashing table. We do not use a static set
5310 of possible tables sizes anymore. Instead we determine for all
5311 possible reasonable sizes of the table the outcome (i.e., the
5312 number of collisions etc) and choose the best solution. The
5313 weighting functions are not too simple to allow the table to grow
5314 without bounds. Instead one of the weighting factors is the size.
5315 Therefore the result is always a good payoff between few collisions
5316 (= short chain lengths) and table size. */
5318 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5319 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5320 unsigned long int nsyms,
5323 size_t best_size = 0;
5324 unsigned long int i;
5326 /* We have a problem here. The following code to optimize the table
5327 size requires an integer type with more the 32 bits. If
5328 BFD_HOST_U_64_BIT is set we know about such a type. */
5329 #ifdef BFD_HOST_U_64_BIT
5334 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5335 bfd *dynobj = elf_hash_table (info)->dynobj;
5336 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5337 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5338 unsigned long int *counts;
5340 unsigned int no_improvement_count = 0;
5342 /* Possible optimization parameters: if we have NSYMS symbols we say
5343 that the hashing table must at least have NSYMS/4 and at most
5345 minsize = nsyms / 4;
5348 best_size = maxsize = nsyms * 2;
5353 if ((best_size & 31) == 0)
5357 /* Create array where we count the collisions in. We must use bfd_malloc
5358 since the size could be large. */
5360 amt *= sizeof (unsigned long int);
5361 counts = (unsigned long int *) bfd_malloc (amt);
5365 /* Compute the "optimal" size for the hash table. The criteria is a
5366 minimal chain length. The minor criteria is (of course) the size
5368 for (i = minsize; i < maxsize; ++i)
5370 /* Walk through the array of hashcodes and count the collisions. */
5371 BFD_HOST_U_64_BIT max;
5372 unsigned long int j;
5373 unsigned long int fact;
5375 if (gnu_hash && (i & 31) == 0)
5378 memset (counts, '\0', i * sizeof (unsigned long int));
5380 /* Determine how often each hash bucket is used. */
5381 for (j = 0; j < nsyms; ++j)
5382 ++counts[hashcodes[j] % i];
5384 /* For the weight function we need some information about the
5385 pagesize on the target. This is information need not be 100%
5386 accurate. Since this information is not available (so far) we
5387 define it here to a reasonable default value. If it is crucial
5388 to have a better value some day simply define this value. */
5389 # ifndef BFD_TARGET_PAGESIZE
5390 # define BFD_TARGET_PAGESIZE (4096)
5393 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5395 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5398 /* Variant 1: optimize for short chains. We add the squares
5399 of all the chain lengths (which favors many small chain
5400 over a few long chains). */
5401 for (j = 0; j < i; ++j)
5402 max += counts[j] * counts[j];
5404 /* This adds penalties for the overall size of the table. */
5405 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5408 /* Variant 2: Optimize a lot more for small table. Here we
5409 also add squares of the size but we also add penalties for
5410 empty slots (the +1 term). */
5411 for (j = 0; j < i; ++j)
5412 max += (1 + counts[j]) * (1 + counts[j]);
5414 /* The overall size of the table is considered, but not as
5415 strong as in variant 1, where it is squared. */
5416 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5420 /* Compare with current best results. */
5421 if (max < best_chlen)
5425 no_improvement_count = 0;
5427 /* PR 11843: Avoid futile long searches for the best bucket size
5428 when there are a large number of symbols. */
5429 else if (++no_improvement_count == 100)
5436 #endif /* defined (BFD_HOST_U_64_BIT) */
5438 /* This is the fallback solution if no 64bit type is available or if we
5439 are not supposed to spend much time on optimizations. We select the
5440 bucket count using a fixed set of numbers. */
5441 for (i = 0; elf_buckets[i] != 0; i++)
5443 best_size = elf_buckets[i];
5444 if (nsyms < elf_buckets[i + 1])
5447 if (gnu_hash && best_size < 2)
5454 /* Size any SHT_GROUP section for ld -r. */
5457 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5461 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5462 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5463 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5468 /* Set a default stack segment size. The value in INFO wins. If it
5469 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5470 undefined it is initialized. */
5473 bfd_elf_stack_segment_size (bfd *output_bfd,
5474 struct bfd_link_info *info,
5475 const char *legacy_symbol,
5476 bfd_vma default_size)
5478 struct elf_link_hash_entry *h = NULL;
5480 /* Look for legacy symbol. */
5482 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5483 FALSE, FALSE, FALSE);
5484 if (h && (h->root.type == bfd_link_hash_defined
5485 || h->root.type == bfd_link_hash_defweak)
5487 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5489 /* The symbol has no type if specified on the command line. */
5490 h->type = STT_OBJECT;
5491 if (info->stacksize)
5492 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5493 output_bfd, legacy_symbol);
5494 else if (h->root.u.def.section != bfd_abs_section_ptr)
5495 (*_bfd_error_handler) (_("%B: %s not absolute"),
5496 output_bfd, legacy_symbol);
5498 info->stacksize = h->root.u.def.value;
5501 if (!info->stacksize)
5502 /* If the user didn't set a size, or explicitly inhibit the
5503 size, set it now. */
5504 info->stacksize = default_size;
5506 /* Provide the legacy symbol, if it is referenced. */
5507 if (h && (h->root.type == bfd_link_hash_undefined
5508 || h->root.type == bfd_link_hash_undefweak))
5510 struct bfd_link_hash_entry *bh = NULL;
5512 if (!(_bfd_generic_link_add_one_symbol
5513 (info, output_bfd, legacy_symbol,
5514 BSF_GLOBAL, bfd_abs_section_ptr,
5515 info->stacksize >= 0 ? info->stacksize : 0,
5516 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5519 h = (struct elf_link_hash_entry *) bh;
5521 h->type = STT_OBJECT;
5527 /* Set up the sizes and contents of the ELF dynamic sections. This is
5528 called by the ELF linker emulation before_allocation routine. We
5529 must set the sizes of the sections before the linker sets the
5530 addresses of the various sections. */
5533 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5536 const char *filter_shlib,
5538 const char *depaudit,
5539 const char * const *auxiliary_filters,
5540 struct bfd_link_info *info,
5541 asection **sinterpptr)
5543 bfd_size_type soname_indx;
5545 const struct elf_backend_data *bed;
5546 struct elf_info_failed asvinfo;
5550 soname_indx = (bfd_size_type) -1;
5552 if (!is_elf_hash_table (info->hash))
5555 bed = get_elf_backend_data (output_bfd);
5557 /* Any syms created from now on start with -1 in
5558 got.refcount/offset and plt.refcount/offset. */
5559 elf_hash_table (info)->init_got_refcount
5560 = elf_hash_table (info)->init_got_offset;
5561 elf_hash_table (info)->init_plt_refcount
5562 = elf_hash_table (info)->init_plt_offset;
5564 if (info->relocatable
5565 && !_bfd_elf_size_group_sections (info))
5568 /* The backend may have to create some sections regardless of whether
5569 we're dynamic or not. */
5570 if (bed->elf_backend_always_size_sections
5571 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5574 /* Determine any GNU_STACK segment requirements, after the backend
5575 has had a chance to set a default segment size. */
5576 if (info->execstack)
5577 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5578 else if (info->noexecstack)
5579 elf_stack_flags (output_bfd) = PF_R | PF_W;
5583 asection *notesec = NULL;
5586 for (inputobj = info->input_bfds;
5588 inputobj = inputobj->link.next)
5593 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5595 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5598 if (s->flags & SEC_CODE)
5602 else if (bed->default_execstack)
5605 if (notesec || info->stacksize > 0)
5606 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5607 if (notesec && exec && info->relocatable
5608 && notesec->output_section != bfd_abs_section_ptr)
5609 notesec->output_section->flags |= SEC_CODE;
5612 dynobj = elf_hash_table (info)->dynobj;
5614 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5616 struct elf_info_failed eif;
5617 struct elf_link_hash_entry *h;
5619 struct bfd_elf_version_tree *t;
5620 struct bfd_elf_version_expr *d;
5622 bfd_boolean all_defined;
5624 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5625 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5629 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5631 if (soname_indx == (bfd_size_type) -1
5632 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5638 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5640 info->flags |= DF_SYMBOLIC;
5648 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5650 if (indx == (bfd_size_type) -1)
5653 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5654 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5658 if (filter_shlib != NULL)
5662 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5663 filter_shlib, TRUE);
5664 if (indx == (bfd_size_type) -1
5665 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5669 if (auxiliary_filters != NULL)
5671 const char * const *p;
5673 for (p = auxiliary_filters; *p != NULL; p++)
5677 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5679 if (indx == (bfd_size_type) -1
5680 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5689 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5691 if (indx == (bfd_size_type) -1
5692 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5696 if (depaudit != NULL)
5700 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5702 if (indx == (bfd_size_type) -1
5703 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5710 /* If we are supposed to export all symbols into the dynamic symbol
5711 table (this is not the normal case), then do so. */
5712 if (info->export_dynamic
5713 || (info->executable && info->dynamic))
5715 elf_link_hash_traverse (elf_hash_table (info),
5716 _bfd_elf_export_symbol,
5722 /* Make all global versions with definition. */
5723 for (t = info->version_info; t != NULL; t = t->next)
5724 for (d = t->globals.list; d != NULL; d = d->next)
5725 if (!d->symver && d->literal)
5727 const char *verstr, *name;
5728 size_t namelen, verlen, newlen;
5729 char *newname, *p, leading_char;
5730 struct elf_link_hash_entry *newh;
5732 leading_char = bfd_get_symbol_leading_char (output_bfd);
5734 namelen = strlen (name) + (leading_char != '\0');
5736 verlen = strlen (verstr);
5737 newlen = namelen + verlen + 3;
5739 newname = (char *) bfd_malloc (newlen);
5740 if (newname == NULL)
5742 newname[0] = leading_char;
5743 memcpy (newname + (leading_char != '\0'), name, namelen);
5745 /* Check the hidden versioned definition. */
5746 p = newname + namelen;
5748 memcpy (p, verstr, verlen + 1);
5749 newh = elf_link_hash_lookup (elf_hash_table (info),
5750 newname, FALSE, FALSE,
5753 || (newh->root.type != bfd_link_hash_defined
5754 && newh->root.type != bfd_link_hash_defweak))
5756 /* Check the default versioned definition. */
5758 memcpy (p, verstr, verlen + 1);
5759 newh = elf_link_hash_lookup (elf_hash_table (info),
5760 newname, FALSE, FALSE,
5765 /* Mark this version if there is a definition and it is
5766 not defined in a shared object. */
5768 && !newh->def_dynamic
5769 && (newh->root.type == bfd_link_hash_defined
5770 || newh->root.type == bfd_link_hash_defweak))
5774 /* Attach all the symbols to their version information. */
5775 asvinfo.info = info;
5776 asvinfo.failed = FALSE;
5778 elf_link_hash_traverse (elf_hash_table (info),
5779 _bfd_elf_link_assign_sym_version,
5784 if (!info->allow_undefined_version)
5786 /* Check if all global versions have a definition. */
5788 for (t = info->version_info; t != NULL; t = t->next)
5789 for (d = t->globals.list; d != NULL; d = d->next)
5790 if (d->literal && !d->symver && !d->script)
5792 (*_bfd_error_handler)
5793 (_("%s: undefined version: %s"),
5794 d->pattern, t->name);
5795 all_defined = FALSE;
5800 bfd_set_error (bfd_error_bad_value);
5805 /* Find all symbols which were defined in a dynamic object and make
5806 the backend pick a reasonable value for them. */
5807 elf_link_hash_traverse (elf_hash_table (info),
5808 _bfd_elf_adjust_dynamic_symbol,
5813 /* Add some entries to the .dynamic section. We fill in some of the
5814 values later, in bfd_elf_final_link, but we must add the entries
5815 now so that we know the final size of the .dynamic section. */
5817 /* If there are initialization and/or finalization functions to
5818 call then add the corresponding DT_INIT/DT_FINI entries. */
5819 h = (info->init_function
5820 ? elf_link_hash_lookup (elf_hash_table (info),
5821 info->init_function, FALSE,
5828 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5831 h = (info->fini_function
5832 ? elf_link_hash_lookup (elf_hash_table (info),
5833 info->fini_function, FALSE,
5840 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5844 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5845 if (s != NULL && s->linker_has_input)
5847 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5848 if (! info->executable)
5853 for (sub = info->input_bfds; sub != NULL;
5854 sub = sub->link.next)
5855 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5856 for (o = sub->sections; o != NULL; o = o->next)
5857 if (elf_section_data (o)->this_hdr.sh_type
5858 == SHT_PREINIT_ARRAY)
5860 (*_bfd_error_handler)
5861 (_("%B: .preinit_array section is not allowed in DSO"),
5866 bfd_set_error (bfd_error_nonrepresentable_section);
5870 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5871 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5874 s = bfd_get_section_by_name (output_bfd, ".init_array");
5875 if (s != NULL && s->linker_has_input)
5877 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5878 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5881 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5882 if (s != NULL && s->linker_has_input)
5884 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5885 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5889 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
5890 /* If .dynstr is excluded from the link, we don't want any of
5891 these tags. Strictly, we should be checking each section
5892 individually; This quick check covers for the case where
5893 someone does a /DISCARD/ : { *(*) }. */
5894 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5896 bfd_size_type strsize;
5898 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5899 if ((info->emit_hash
5900 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5901 || (info->emit_gnu_hash
5902 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5903 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5904 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5905 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5906 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5907 bed->s->sizeof_sym))
5912 /* The backend must work out the sizes of all the other dynamic
5915 && bed->elf_backend_size_dynamic_sections != NULL
5916 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5919 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5922 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5924 unsigned long section_sym_count;
5925 struct bfd_elf_version_tree *verdefs;
5928 /* Set up the version definition section. */
5929 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
5930 BFD_ASSERT (s != NULL);
5932 /* We may have created additional version definitions if we are
5933 just linking a regular application. */
5934 verdefs = info->version_info;
5936 /* Skip anonymous version tag. */
5937 if (verdefs != NULL && verdefs->vernum == 0)
5938 verdefs = verdefs->next;
5940 if (verdefs == NULL && !info->create_default_symver)
5941 s->flags |= SEC_EXCLUDE;
5946 struct bfd_elf_version_tree *t;
5948 Elf_Internal_Verdef def;
5949 Elf_Internal_Verdaux defaux;
5950 struct bfd_link_hash_entry *bh;
5951 struct elf_link_hash_entry *h;
5957 /* Make space for the base version. */
5958 size += sizeof (Elf_External_Verdef);
5959 size += sizeof (Elf_External_Verdaux);
5962 /* Make space for the default version. */
5963 if (info->create_default_symver)
5965 size += sizeof (Elf_External_Verdef);
5969 for (t = verdefs; t != NULL; t = t->next)
5971 struct bfd_elf_version_deps *n;
5973 /* Don't emit base version twice. */
5977 size += sizeof (Elf_External_Verdef);
5978 size += sizeof (Elf_External_Verdaux);
5981 for (n = t->deps; n != NULL; n = n->next)
5982 size += sizeof (Elf_External_Verdaux);
5986 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
5987 if (s->contents == NULL && s->size != 0)
5990 /* Fill in the version definition section. */
5994 def.vd_version = VER_DEF_CURRENT;
5995 def.vd_flags = VER_FLG_BASE;
5998 if (info->create_default_symver)
6000 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
6001 def.vd_next = sizeof (Elf_External_Verdef);
6005 def.vd_aux = sizeof (Elf_External_Verdef);
6006 def.vd_next = (sizeof (Elf_External_Verdef)
6007 + sizeof (Elf_External_Verdaux));
6010 if (soname_indx != (bfd_size_type) -1)
6012 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6014 def.vd_hash = bfd_elf_hash (soname);
6015 defaux.vda_name = soname_indx;
6022 name = lbasename (output_bfd->filename);
6023 def.vd_hash = bfd_elf_hash (name);
6024 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6026 if (indx == (bfd_size_type) -1)
6028 defaux.vda_name = indx;
6030 defaux.vda_next = 0;
6032 _bfd_elf_swap_verdef_out (output_bfd, &def,
6033 (Elf_External_Verdef *) p);
6034 p += sizeof (Elf_External_Verdef);
6035 if (info->create_default_symver)
6037 /* Add a symbol representing this version. */
6039 if (! (_bfd_generic_link_add_one_symbol
6040 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6042 get_elf_backend_data (dynobj)->collect, &bh)))
6044 h = (struct elf_link_hash_entry *) bh;
6047 h->type = STT_OBJECT;
6048 h->verinfo.vertree = NULL;
6050 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6053 /* Create a duplicate of the base version with the same
6054 aux block, but different flags. */
6057 def.vd_aux = sizeof (Elf_External_Verdef);
6059 def.vd_next = (sizeof (Elf_External_Verdef)
6060 + sizeof (Elf_External_Verdaux));
6063 _bfd_elf_swap_verdef_out (output_bfd, &def,
6064 (Elf_External_Verdef *) p);
6065 p += sizeof (Elf_External_Verdef);
6067 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6068 (Elf_External_Verdaux *) p);
6069 p += sizeof (Elf_External_Verdaux);
6071 for (t = verdefs; t != NULL; t = t->next)
6074 struct bfd_elf_version_deps *n;
6076 /* Don't emit the base version twice. */
6081 for (n = t->deps; n != NULL; n = n->next)
6084 /* Add a symbol representing this version. */
6086 if (! (_bfd_generic_link_add_one_symbol
6087 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6089 get_elf_backend_data (dynobj)->collect, &bh)))
6091 h = (struct elf_link_hash_entry *) bh;
6094 h->type = STT_OBJECT;
6095 h->verinfo.vertree = t;
6097 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6100 def.vd_version = VER_DEF_CURRENT;
6102 if (t->globals.list == NULL
6103 && t->locals.list == NULL
6105 def.vd_flags |= VER_FLG_WEAK;
6106 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6107 def.vd_cnt = cdeps + 1;
6108 def.vd_hash = bfd_elf_hash (t->name);
6109 def.vd_aux = sizeof (Elf_External_Verdef);
6112 /* If a basever node is next, it *must* be the last node in
6113 the chain, otherwise Verdef construction breaks. */
6114 if (t->next != NULL && t->next->vernum == 0)
6115 BFD_ASSERT (t->next->next == NULL);
6117 if (t->next != NULL && t->next->vernum != 0)
6118 def.vd_next = (sizeof (Elf_External_Verdef)
6119 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6121 _bfd_elf_swap_verdef_out (output_bfd, &def,
6122 (Elf_External_Verdef *) p);
6123 p += sizeof (Elf_External_Verdef);
6125 defaux.vda_name = h->dynstr_index;
6126 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6128 defaux.vda_next = 0;
6129 if (t->deps != NULL)
6130 defaux.vda_next = sizeof (Elf_External_Verdaux);
6131 t->name_indx = defaux.vda_name;
6133 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6134 (Elf_External_Verdaux *) p);
6135 p += sizeof (Elf_External_Verdaux);
6137 for (n = t->deps; n != NULL; n = n->next)
6139 if (n->version_needed == NULL)
6141 /* This can happen if there was an error in the
6143 defaux.vda_name = 0;
6147 defaux.vda_name = n->version_needed->name_indx;
6148 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6151 if (n->next == NULL)
6152 defaux.vda_next = 0;
6154 defaux.vda_next = sizeof (Elf_External_Verdaux);
6156 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6157 (Elf_External_Verdaux *) p);
6158 p += sizeof (Elf_External_Verdaux);
6162 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6163 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6166 elf_tdata (output_bfd)->cverdefs = cdefs;
6169 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6171 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6174 else if (info->flags & DF_BIND_NOW)
6176 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6182 if (info->executable)
6183 info->flags_1 &= ~ (DF_1_INITFIRST
6186 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6190 /* Work out the size of the version reference section. */
6192 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6193 BFD_ASSERT (s != NULL);
6195 struct elf_find_verdep_info sinfo;
6198 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6199 if (sinfo.vers == 0)
6201 sinfo.failed = FALSE;
6203 elf_link_hash_traverse (elf_hash_table (info),
6204 _bfd_elf_link_find_version_dependencies,
6209 if (elf_tdata (output_bfd)->verref == NULL)
6210 s->flags |= SEC_EXCLUDE;
6213 Elf_Internal_Verneed *t;
6218 /* Build the version dependency section. */
6221 for (t = elf_tdata (output_bfd)->verref;
6225 Elf_Internal_Vernaux *a;
6227 size += sizeof (Elf_External_Verneed);
6229 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6230 size += sizeof (Elf_External_Vernaux);
6234 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6235 if (s->contents == NULL)
6239 for (t = elf_tdata (output_bfd)->verref;
6244 Elf_Internal_Vernaux *a;
6248 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6251 t->vn_version = VER_NEED_CURRENT;
6253 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6254 elf_dt_name (t->vn_bfd) != NULL
6255 ? elf_dt_name (t->vn_bfd)
6256 : lbasename (t->vn_bfd->filename),
6258 if (indx == (bfd_size_type) -1)
6261 t->vn_aux = sizeof (Elf_External_Verneed);
6262 if (t->vn_nextref == NULL)
6265 t->vn_next = (sizeof (Elf_External_Verneed)
6266 + caux * sizeof (Elf_External_Vernaux));
6268 _bfd_elf_swap_verneed_out (output_bfd, t,
6269 (Elf_External_Verneed *) p);
6270 p += sizeof (Elf_External_Verneed);
6272 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6274 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6275 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6276 a->vna_nodename, FALSE);
6277 if (indx == (bfd_size_type) -1)
6280 if (a->vna_nextptr == NULL)
6283 a->vna_next = sizeof (Elf_External_Vernaux);
6285 _bfd_elf_swap_vernaux_out (output_bfd, a,
6286 (Elf_External_Vernaux *) p);
6287 p += sizeof (Elf_External_Vernaux);
6291 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6292 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6295 elf_tdata (output_bfd)->cverrefs = crefs;
6299 if ((elf_tdata (output_bfd)->cverrefs == 0
6300 && elf_tdata (output_bfd)->cverdefs == 0)
6301 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6302 §ion_sym_count) == 0)
6304 s = bfd_get_linker_section (dynobj, ".gnu.version");
6305 s->flags |= SEC_EXCLUDE;
6311 /* Find the first non-excluded output section. We'll use its
6312 section symbol for some emitted relocs. */
6314 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6318 for (s = output_bfd->sections; s != NULL; s = s->next)
6319 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6320 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6322 elf_hash_table (info)->text_index_section = s;
6327 /* Find two non-excluded output sections, one for code, one for data.
6328 We'll use their section symbols for some emitted relocs. */
6330 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6334 /* Data first, since setting text_index_section changes
6335 _bfd_elf_link_omit_section_dynsym. */
6336 for (s = output_bfd->sections; s != NULL; s = s->next)
6337 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6338 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6340 elf_hash_table (info)->data_index_section = s;
6344 for (s = output_bfd->sections; s != NULL; s = s->next)
6345 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6346 == (SEC_ALLOC | SEC_READONLY))
6347 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6349 elf_hash_table (info)->text_index_section = s;
6353 if (elf_hash_table (info)->text_index_section == NULL)
6354 elf_hash_table (info)->text_index_section
6355 = elf_hash_table (info)->data_index_section;
6359 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6361 const struct elf_backend_data *bed;
6363 if (!is_elf_hash_table (info->hash))
6366 bed = get_elf_backend_data (output_bfd);
6367 (*bed->elf_backend_init_index_section) (output_bfd, info);
6369 if (elf_hash_table (info)->dynamic_sections_created)
6373 bfd_size_type dynsymcount;
6374 unsigned long section_sym_count;
6375 unsigned int dtagcount;
6377 dynobj = elf_hash_table (info)->dynobj;
6379 /* Assign dynsym indicies. In a shared library we generate a
6380 section symbol for each output section, which come first.
6381 Next come all of the back-end allocated local dynamic syms,
6382 followed by the rest of the global symbols. */
6384 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6385 §ion_sym_count);
6387 /* Work out the size of the symbol version section. */
6388 s = bfd_get_linker_section (dynobj, ".gnu.version");
6389 BFD_ASSERT (s != NULL);
6390 if (dynsymcount != 0
6391 && (s->flags & SEC_EXCLUDE) == 0)
6393 s->size = dynsymcount * sizeof (Elf_External_Versym);
6394 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6395 if (s->contents == NULL)
6398 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6402 /* Set the size of the .dynsym and .hash sections. We counted
6403 the number of dynamic symbols in elf_link_add_object_symbols.
6404 We will build the contents of .dynsym and .hash when we build
6405 the final symbol table, because until then we do not know the
6406 correct value to give the symbols. We built the .dynstr
6407 section as we went along in elf_link_add_object_symbols. */
6408 s = bfd_get_linker_section (dynobj, ".dynsym");
6409 BFD_ASSERT (s != NULL);
6410 s->size = dynsymcount * bed->s->sizeof_sym;
6412 if (dynsymcount != 0)
6414 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6415 if (s->contents == NULL)
6418 /* The first entry in .dynsym is a dummy symbol.
6419 Clear all the section syms, in case we don't output them all. */
6420 ++section_sym_count;
6421 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6424 elf_hash_table (info)->bucketcount = 0;
6426 /* Compute the size of the hashing table. As a side effect this
6427 computes the hash values for all the names we export. */
6428 if (info->emit_hash)
6430 unsigned long int *hashcodes;
6431 struct hash_codes_info hashinf;
6433 unsigned long int nsyms;
6435 size_t hash_entry_size;
6437 /* Compute the hash values for all exported symbols. At the same
6438 time store the values in an array so that we could use them for
6440 amt = dynsymcount * sizeof (unsigned long int);
6441 hashcodes = (unsigned long int *) bfd_malloc (amt);
6442 if (hashcodes == NULL)
6444 hashinf.hashcodes = hashcodes;
6445 hashinf.error = FALSE;
6447 /* Put all hash values in HASHCODES. */
6448 elf_link_hash_traverse (elf_hash_table (info),
6449 elf_collect_hash_codes, &hashinf);
6456 nsyms = hashinf.hashcodes - hashcodes;
6458 = compute_bucket_count (info, hashcodes, nsyms, 0);
6461 if (bucketcount == 0)
6464 elf_hash_table (info)->bucketcount = bucketcount;
6466 s = bfd_get_linker_section (dynobj, ".hash");
6467 BFD_ASSERT (s != NULL);
6468 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6469 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6470 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6471 if (s->contents == NULL)
6474 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6475 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6476 s->contents + hash_entry_size);
6479 if (info->emit_gnu_hash)
6482 unsigned char *contents;
6483 struct collect_gnu_hash_codes cinfo;
6487 memset (&cinfo, 0, sizeof (cinfo));
6489 /* Compute the hash values for all exported symbols. At the same
6490 time store the values in an array so that we could use them for
6492 amt = dynsymcount * 2 * sizeof (unsigned long int);
6493 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6494 if (cinfo.hashcodes == NULL)
6497 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6498 cinfo.min_dynindx = -1;
6499 cinfo.output_bfd = output_bfd;
6502 /* Put all hash values in HASHCODES. */
6503 elf_link_hash_traverse (elf_hash_table (info),
6504 elf_collect_gnu_hash_codes, &cinfo);
6507 free (cinfo.hashcodes);
6512 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6514 if (bucketcount == 0)
6516 free (cinfo.hashcodes);
6520 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6521 BFD_ASSERT (s != NULL);
6523 if (cinfo.nsyms == 0)
6525 /* Empty .gnu.hash section is special. */
6526 BFD_ASSERT (cinfo.min_dynindx == -1);
6527 free (cinfo.hashcodes);
6528 s->size = 5 * 4 + bed->s->arch_size / 8;
6529 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6530 if (contents == NULL)
6532 s->contents = contents;
6533 /* 1 empty bucket. */
6534 bfd_put_32 (output_bfd, 1, contents);
6535 /* SYMIDX above the special symbol 0. */
6536 bfd_put_32 (output_bfd, 1, contents + 4);
6537 /* Just one word for bitmask. */
6538 bfd_put_32 (output_bfd, 1, contents + 8);
6539 /* Only hash fn bloom filter. */
6540 bfd_put_32 (output_bfd, 0, contents + 12);
6541 /* No hashes are valid - empty bitmask. */
6542 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6543 /* No hashes in the only bucket. */
6544 bfd_put_32 (output_bfd, 0,
6545 contents + 16 + bed->s->arch_size / 8);
6549 unsigned long int maskwords, maskbitslog2, x;
6550 BFD_ASSERT (cinfo.min_dynindx != -1);
6554 while ((x >>= 1) != 0)
6556 if (maskbitslog2 < 3)
6558 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6559 maskbitslog2 = maskbitslog2 + 3;
6561 maskbitslog2 = maskbitslog2 + 2;
6562 if (bed->s->arch_size == 64)
6564 if (maskbitslog2 == 5)
6570 cinfo.mask = (1 << cinfo.shift1) - 1;
6571 cinfo.shift2 = maskbitslog2;
6572 cinfo.maskbits = 1 << maskbitslog2;
6573 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6574 amt = bucketcount * sizeof (unsigned long int) * 2;
6575 amt += maskwords * sizeof (bfd_vma);
6576 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6577 if (cinfo.bitmask == NULL)
6579 free (cinfo.hashcodes);
6583 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6584 cinfo.indx = cinfo.counts + bucketcount;
6585 cinfo.symindx = dynsymcount - cinfo.nsyms;
6586 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6588 /* Determine how often each hash bucket is used. */
6589 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6590 for (i = 0; i < cinfo.nsyms; ++i)
6591 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6593 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6594 if (cinfo.counts[i] != 0)
6596 cinfo.indx[i] = cnt;
6597 cnt += cinfo.counts[i];
6599 BFD_ASSERT (cnt == dynsymcount);
6600 cinfo.bucketcount = bucketcount;
6601 cinfo.local_indx = cinfo.min_dynindx;
6603 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6604 s->size += cinfo.maskbits / 8;
6605 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6606 if (contents == NULL)
6608 free (cinfo.bitmask);
6609 free (cinfo.hashcodes);
6613 s->contents = contents;
6614 bfd_put_32 (output_bfd, bucketcount, contents);
6615 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6616 bfd_put_32 (output_bfd, maskwords, contents + 8);
6617 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6618 contents += 16 + cinfo.maskbits / 8;
6620 for (i = 0; i < bucketcount; ++i)
6622 if (cinfo.counts[i] == 0)
6623 bfd_put_32 (output_bfd, 0, contents);
6625 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6629 cinfo.contents = contents;
6631 /* Renumber dynamic symbols, populate .gnu.hash section. */
6632 elf_link_hash_traverse (elf_hash_table (info),
6633 elf_renumber_gnu_hash_syms, &cinfo);
6635 contents = s->contents + 16;
6636 for (i = 0; i < maskwords; ++i)
6638 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6640 contents += bed->s->arch_size / 8;
6643 free (cinfo.bitmask);
6644 free (cinfo.hashcodes);
6648 s = bfd_get_linker_section (dynobj, ".dynstr");
6649 BFD_ASSERT (s != NULL);
6651 elf_finalize_dynstr (output_bfd, info);
6653 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6655 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6656 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6663 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6666 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6669 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6670 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6673 /* Finish SHF_MERGE section merging. */
6676 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6681 if (!is_elf_hash_table (info->hash))
6684 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6685 if ((ibfd->flags & DYNAMIC) == 0)
6686 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6687 if ((sec->flags & SEC_MERGE) != 0
6688 && !bfd_is_abs_section (sec->output_section))
6690 struct bfd_elf_section_data *secdata;
6692 secdata = elf_section_data (sec);
6693 if (! _bfd_add_merge_section (abfd,
6694 &elf_hash_table (info)->merge_info,
6695 sec, &secdata->sec_info))
6697 else if (secdata->sec_info)
6698 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6701 if (elf_hash_table (info)->merge_info != NULL)
6702 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6703 merge_sections_remove_hook);
6707 /* Create an entry in an ELF linker hash table. */
6709 struct bfd_hash_entry *
6710 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6711 struct bfd_hash_table *table,
6714 /* Allocate the structure if it has not already been allocated by a
6718 entry = (struct bfd_hash_entry *)
6719 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6724 /* Call the allocation method of the superclass. */
6725 entry = _bfd_link_hash_newfunc (entry, table, string);
6728 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6729 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6731 /* Set local fields. */
6734 ret->got = htab->init_got_refcount;
6735 ret->plt = htab->init_plt_refcount;
6736 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6737 - offsetof (struct elf_link_hash_entry, size)));
6738 /* Assume that we have been called by a non-ELF symbol reader.
6739 This flag is then reset by the code which reads an ELF input
6740 file. This ensures that a symbol created by a non-ELF symbol
6741 reader will have the flag set correctly. */
6748 /* Copy data from an indirect symbol to its direct symbol, hiding the
6749 old indirect symbol. Also used for copying flags to a weakdef. */
6752 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6753 struct elf_link_hash_entry *dir,
6754 struct elf_link_hash_entry *ind)
6756 struct elf_link_hash_table *htab;
6758 /* Copy down any references that we may have already seen to the
6759 symbol which just became indirect. */
6761 dir->ref_dynamic |= ind->ref_dynamic;
6762 dir->ref_regular |= ind->ref_regular;
6763 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6764 dir->non_got_ref |= ind->non_got_ref;
6765 dir->needs_plt |= ind->needs_plt;
6766 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6768 if (ind->root.type != bfd_link_hash_indirect)
6771 /* Copy over the global and procedure linkage table refcount entries.
6772 These may have been already set up by a check_relocs routine. */
6773 htab = elf_hash_table (info);
6774 if (ind->got.refcount > htab->init_got_refcount.refcount)
6776 if (dir->got.refcount < 0)
6777 dir->got.refcount = 0;
6778 dir->got.refcount += ind->got.refcount;
6779 ind->got.refcount = htab->init_got_refcount.refcount;
6782 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6784 if (dir->plt.refcount < 0)
6785 dir->plt.refcount = 0;
6786 dir->plt.refcount += ind->plt.refcount;
6787 ind->plt.refcount = htab->init_plt_refcount.refcount;
6790 if (ind->dynindx != -1)
6792 if (dir->dynindx != -1)
6793 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6794 dir->dynindx = ind->dynindx;
6795 dir->dynstr_index = ind->dynstr_index;
6797 ind->dynstr_index = 0;
6802 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6803 struct elf_link_hash_entry *h,
6804 bfd_boolean force_local)
6806 /* STT_GNU_IFUNC symbol must go through PLT. */
6807 if (h->type != STT_GNU_IFUNC)
6809 h->plt = elf_hash_table (info)->init_plt_offset;
6814 h->forced_local = 1;
6815 if (h->dynindx != -1)
6818 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6824 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
6828 _bfd_elf_link_hash_table_init
6829 (struct elf_link_hash_table *table,
6831 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6832 struct bfd_hash_table *,
6834 unsigned int entsize,
6835 enum elf_target_id target_id)
6838 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6840 table->init_got_refcount.refcount = can_refcount - 1;
6841 table->init_plt_refcount.refcount = can_refcount - 1;
6842 table->init_got_offset.offset = -(bfd_vma) 1;
6843 table->init_plt_offset.offset = -(bfd_vma) 1;
6844 /* The first dynamic symbol is a dummy. */
6845 table->dynsymcount = 1;
6847 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6849 table->root.type = bfd_link_elf_hash_table;
6850 table->hash_table_id = target_id;
6855 /* Create an ELF linker hash table. */
6857 struct bfd_link_hash_table *
6858 _bfd_elf_link_hash_table_create (bfd *abfd)
6860 struct elf_link_hash_table *ret;
6861 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6863 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
6867 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6868 sizeof (struct elf_link_hash_entry),
6874 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
6879 /* Destroy an ELF linker hash table. */
6882 _bfd_elf_link_hash_table_free (bfd *obfd)
6884 struct elf_link_hash_table *htab;
6886 htab = (struct elf_link_hash_table *) obfd->link.hash;
6887 if (htab->dynstr != NULL)
6888 _bfd_elf_strtab_free (htab->dynstr);
6889 _bfd_merge_sections_free (htab->merge_info);
6890 _bfd_generic_link_hash_table_free (obfd);
6893 /* This is a hook for the ELF emulation code in the generic linker to
6894 tell the backend linker what file name to use for the DT_NEEDED
6895 entry for a dynamic object. */
6898 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6900 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6901 && bfd_get_format (abfd) == bfd_object)
6902 elf_dt_name (abfd) = name;
6906 bfd_elf_get_dyn_lib_class (bfd *abfd)
6909 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6910 && bfd_get_format (abfd) == bfd_object)
6911 lib_class = elf_dyn_lib_class (abfd);
6918 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6920 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6921 && bfd_get_format (abfd) == bfd_object)
6922 elf_dyn_lib_class (abfd) = lib_class;
6925 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6926 the linker ELF emulation code. */
6928 struct bfd_link_needed_list *
6929 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6930 struct bfd_link_info *info)
6932 if (! is_elf_hash_table (info->hash))
6934 return elf_hash_table (info)->needed;
6937 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6938 hook for the linker ELF emulation code. */
6940 struct bfd_link_needed_list *
6941 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6942 struct bfd_link_info *info)
6944 if (! is_elf_hash_table (info->hash))
6946 return elf_hash_table (info)->runpath;
6949 /* Get the name actually used for a dynamic object for a link. This
6950 is the SONAME entry if there is one. Otherwise, it is the string
6951 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6954 bfd_elf_get_dt_soname (bfd *abfd)
6956 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6957 && bfd_get_format (abfd) == bfd_object)
6958 return elf_dt_name (abfd);
6962 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6963 the ELF linker emulation code. */
6966 bfd_elf_get_bfd_needed_list (bfd *abfd,
6967 struct bfd_link_needed_list **pneeded)
6970 bfd_byte *dynbuf = NULL;
6971 unsigned int elfsec;
6972 unsigned long shlink;
6973 bfd_byte *extdyn, *extdynend;
6975 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6979 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6980 || bfd_get_format (abfd) != bfd_object)
6983 s = bfd_get_section_by_name (abfd, ".dynamic");
6984 if (s == NULL || s->size == 0)
6987 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6990 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6991 if (elfsec == SHN_BAD)
6994 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6996 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6997 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
7000 extdynend = extdyn + s->size;
7001 for (; extdyn < extdynend; extdyn += extdynsize)
7003 Elf_Internal_Dyn dyn;
7005 (*swap_dyn_in) (abfd, extdyn, &dyn);
7007 if (dyn.d_tag == DT_NULL)
7010 if (dyn.d_tag == DT_NEEDED)
7013 struct bfd_link_needed_list *l;
7014 unsigned int tagv = dyn.d_un.d_val;
7017 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7022 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7043 struct elf_symbuf_symbol
7045 unsigned long st_name; /* Symbol name, index in string tbl */
7046 unsigned char st_info; /* Type and binding attributes */
7047 unsigned char st_other; /* Visibilty, and target specific */
7050 struct elf_symbuf_head
7052 struct elf_symbuf_symbol *ssym;
7053 bfd_size_type count;
7054 unsigned int st_shndx;
7061 Elf_Internal_Sym *isym;
7062 struct elf_symbuf_symbol *ssym;
7067 /* Sort references to symbols by ascending section number. */
7070 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7072 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7073 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7075 return s1->st_shndx - s2->st_shndx;
7079 elf_sym_name_compare (const void *arg1, const void *arg2)
7081 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7082 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7083 return strcmp (s1->name, s2->name);
7086 static struct elf_symbuf_head *
7087 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7089 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7090 struct elf_symbuf_symbol *ssym;
7091 struct elf_symbuf_head *ssymbuf, *ssymhead;
7092 bfd_size_type i, shndx_count, total_size;
7094 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7098 for (ind = indbuf, i = 0; i < symcount; i++)
7099 if (isymbuf[i].st_shndx != SHN_UNDEF)
7100 *ind++ = &isymbuf[i];
7103 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7104 elf_sort_elf_symbol);
7107 if (indbufend > indbuf)
7108 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7109 if (ind[0]->st_shndx != ind[1]->st_shndx)
7112 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7113 + (indbufend - indbuf) * sizeof (*ssym));
7114 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7115 if (ssymbuf == NULL)
7121 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7122 ssymbuf->ssym = NULL;
7123 ssymbuf->count = shndx_count;
7124 ssymbuf->st_shndx = 0;
7125 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7127 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7130 ssymhead->ssym = ssym;
7131 ssymhead->count = 0;
7132 ssymhead->st_shndx = (*ind)->st_shndx;
7134 ssym->st_name = (*ind)->st_name;
7135 ssym->st_info = (*ind)->st_info;
7136 ssym->st_other = (*ind)->st_other;
7139 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7140 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7147 /* Check if 2 sections define the same set of local and global
7151 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7152 struct bfd_link_info *info)
7155 const struct elf_backend_data *bed1, *bed2;
7156 Elf_Internal_Shdr *hdr1, *hdr2;
7157 bfd_size_type symcount1, symcount2;
7158 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7159 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7160 Elf_Internal_Sym *isym, *isymend;
7161 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7162 bfd_size_type count1, count2, i;
7163 unsigned int shndx1, shndx2;
7169 /* Both sections have to be in ELF. */
7170 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7171 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7174 if (elf_section_type (sec1) != elf_section_type (sec2))
7177 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7178 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7179 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7182 bed1 = get_elf_backend_data (bfd1);
7183 bed2 = get_elf_backend_data (bfd2);
7184 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7185 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7186 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7187 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7189 if (symcount1 == 0 || symcount2 == 0)
7195 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7196 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7198 if (ssymbuf1 == NULL)
7200 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7202 if (isymbuf1 == NULL)
7205 if (!info->reduce_memory_overheads)
7206 elf_tdata (bfd1)->symbuf = ssymbuf1
7207 = elf_create_symbuf (symcount1, isymbuf1);
7210 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7212 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7214 if (isymbuf2 == NULL)
7217 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7218 elf_tdata (bfd2)->symbuf = ssymbuf2
7219 = elf_create_symbuf (symcount2, isymbuf2);
7222 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7224 /* Optimized faster version. */
7225 bfd_size_type lo, hi, mid;
7226 struct elf_symbol *symp;
7227 struct elf_symbuf_symbol *ssym, *ssymend;
7230 hi = ssymbuf1->count;
7235 mid = (lo + hi) / 2;
7236 if (shndx1 < ssymbuf1[mid].st_shndx)
7238 else if (shndx1 > ssymbuf1[mid].st_shndx)
7242 count1 = ssymbuf1[mid].count;
7249 hi = ssymbuf2->count;
7254 mid = (lo + hi) / 2;
7255 if (shndx2 < ssymbuf2[mid].st_shndx)
7257 else if (shndx2 > ssymbuf2[mid].st_shndx)
7261 count2 = ssymbuf2[mid].count;
7267 if (count1 == 0 || count2 == 0 || count1 != count2)
7271 = (struct elf_symbol *) bfd_malloc (count1 * sizeof (*symtable1));
7273 = (struct elf_symbol *) bfd_malloc (count2 * sizeof (*symtable2));
7274 if (symtable1 == NULL || symtable2 == NULL)
7278 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7279 ssym < ssymend; ssym++, symp++)
7281 symp->u.ssym = ssym;
7282 symp->name = bfd_elf_string_from_elf_section (bfd1,
7288 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7289 ssym < ssymend; ssym++, symp++)
7291 symp->u.ssym = ssym;
7292 symp->name = bfd_elf_string_from_elf_section (bfd2,
7297 /* Sort symbol by name. */
7298 qsort (symtable1, count1, sizeof (struct elf_symbol),
7299 elf_sym_name_compare);
7300 qsort (symtable2, count1, sizeof (struct elf_symbol),
7301 elf_sym_name_compare);
7303 for (i = 0; i < count1; i++)
7304 /* Two symbols must have the same binding, type and name. */
7305 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7306 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7307 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7314 symtable1 = (struct elf_symbol *)
7315 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7316 symtable2 = (struct elf_symbol *)
7317 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7318 if (symtable1 == NULL || symtable2 == NULL)
7321 /* Count definitions in the section. */
7323 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7324 if (isym->st_shndx == shndx1)
7325 symtable1[count1++].u.isym = isym;
7328 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7329 if (isym->st_shndx == shndx2)
7330 symtable2[count2++].u.isym = isym;
7332 if (count1 == 0 || count2 == 0 || count1 != count2)
7335 for (i = 0; i < count1; i++)
7337 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7338 symtable1[i].u.isym->st_name);
7340 for (i = 0; i < count2; i++)
7342 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7343 symtable2[i].u.isym->st_name);
7345 /* Sort symbol by name. */
7346 qsort (symtable1, count1, sizeof (struct elf_symbol),
7347 elf_sym_name_compare);
7348 qsort (symtable2, count1, sizeof (struct elf_symbol),
7349 elf_sym_name_compare);
7351 for (i = 0; i < count1; i++)
7352 /* Two symbols must have the same binding, type and name. */
7353 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7354 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7355 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7373 /* Return TRUE if 2 section types are compatible. */
7376 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7377 bfd *bbfd, const asection *bsec)
7381 || abfd->xvec->flavour != bfd_target_elf_flavour
7382 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7385 return elf_section_type (asec) == elf_section_type (bsec);
7388 /* Final phase of ELF linker. */
7390 /* A structure we use to avoid passing large numbers of arguments. */
7392 struct elf_final_link_info
7394 /* General link information. */
7395 struct bfd_link_info *info;
7398 /* Symbol string table. */
7399 struct bfd_strtab_hash *symstrtab;
7400 /* .dynsym section. */
7401 asection *dynsym_sec;
7402 /* .hash section. */
7404 /* symbol version section (.gnu.version). */
7405 asection *symver_sec;
7406 /* Buffer large enough to hold contents of any section. */
7408 /* Buffer large enough to hold external relocs of any section. */
7409 void *external_relocs;
7410 /* Buffer large enough to hold internal relocs of any section. */
7411 Elf_Internal_Rela *internal_relocs;
7412 /* Buffer large enough to hold external local symbols of any input
7414 bfd_byte *external_syms;
7415 /* And a buffer for symbol section indices. */
7416 Elf_External_Sym_Shndx *locsym_shndx;
7417 /* Buffer large enough to hold internal local symbols of any input
7419 Elf_Internal_Sym *internal_syms;
7420 /* Array large enough to hold a symbol index for each local symbol
7421 of any input BFD. */
7423 /* Array large enough to hold a section pointer for each local
7424 symbol of any input BFD. */
7425 asection **sections;
7426 /* Buffer to hold swapped out symbols. */
7428 /* And one for symbol section indices. */
7429 Elf_External_Sym_Shndx *symshndxbuf;
7430 /* Number of swapped out symbols in buffer. */
7431 size_t symbuf_count;
7432 /* Number of symbols which fit in symbuf. */
7434 /* And same for symshndxbuf. */
7435 size_t shndxbuf_size;
7436 /* Number of STT_FILE syms seen. */
7437 size_t filesym_count;
7440 /* This struct is used to pass information to elf_link_output_extsym. */
7442 struct elf_outext_info
7445 bfd_boolean localsyms;
7446 bfd_boolean file_sym_done;
7447 struct elf_final_link_info *flinfo;
7451 /* Support for evaluating a complex relocation.
7453 Complex relocations are generalized, self-describing relocations. The
7454 implementation of them consists of two parts: complex symbols, and the
7455 relocations themselves.
7457 The relocations are use a reserved elf-wide relocation type code (R_RELC
7458 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7459 information (start bit, end bit, word width, etc) into the addend. This
7460 information is extracted from CGEN-generated operand tables within gas.
7462 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7463 internal) representing prefix-notation expressions, including but not
7464 limited to those sorts of expressions normally encoded as addends in the
7465 addend field. The symbol mangling format is:
7468 | <unary-operator> ':' <node>
7469 | <binary-operator> ':' <node> ':' <node>
7472 <literal> := 's' <digits=N> ':' <N character symbol name>
7473 | 'S' <digits=N> ':' <N character section name>
7477 <binary-operator> := as in C
7478 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7481 set_symbol_value (bfd *bfd_with_globals,
7482 Elf_Internal_Sym *isymbuf,
7487 struct elf_link_hash_entry **sym_hashes;
7488 struct elf_link_hash_entry *h;
7489 size_t extsymoff = locsymcount;
7491 if (symidx < locsymcount)
7493 Elf_Internal_Sym *sym;
7495 sym = isymbuf + symidx;
7496 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7498 /* It is a local symbol: move it to the
7499 "absolute" section and give it a value. */
7500 sym->st_shndx = SHN_ABS;
7501 sym->st_value = val;
7504 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7508 /* It is a global symbol: set its link type
7509 to "defined" and give it a value. */
7511 sym_hashes = elf_sym_hashes (bfd_with_globals);
7512 h = sym_hashes [symidx - extsymoff];
7513 while (h->root.type == bfd_link_hash_indirect
7514 || h->root.type == bfd_link_hash_warning)
7515 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7516 h->root.type = bfd_link_hash_defined;
7517 h->root.u.def.value = val;
7518 h->root.u.def.section = bfd_abs_section_ptr;
7522 resolve_symbol (const char *name,
7524 struct elf_final_link_info *flinfo,
7526 Elf_Internal_Sym *isymbuf,
7529 Elf_Internal_Sym *sym;
7530 struct bfd_link_hash_entry *global_entry;
7531 const char *candidate = NULL;
7532 Elf_Internal_Shdr *symtab_hdr;
7535 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7537 for (i = 0; i < locsymcount; ++ i)
7541 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7544 candidate = bfd_elf_string_from_elf_section (input_bfd,
7545 symtab_hdr->sh_link,
7548 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7549 name, candidate, (unsigned long) sym->st_value);
7551 if (candidate && strcmp (candidate, name) == 0)
7553 asection *sec = flinfo->sections [i];
7555 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7556 *result += sec->output_offset + sec->output_section->vma;
7558 printf ("Found symbol with value %8.8lx\n",
7559 (unsigned long) *result);
7565 /* Hmm, haven't found it yet. perhaps it is a global. */
7566 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7567 FALSE, FALSE, TRUE);
7571 if (global_entry->type == bfd_link_hash_defined
7572 || global_entry->type == bfd_link_hash_defweak)
7574 *result = (global_entry->u.def.value
7575 + global_entry->u.def.section->output_section->vma
7576 + global_entry->u.def.section->output_offset);
7578 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7579 global_entry->root.string, (unsigned long) *result);
7588 resolve_section (const char *name,
7595 for (curr = sections; curr; curr = curr->next)
7596 if (strcmp (curr->name, name) == 0)
7598 *result = curr->vma;
7602 /* Hmm. still haven't found it. try pseudo-section names. */
7603 for (curr = sections; curr; curr = curr->next)
7605 len = strlen (curr->name);
7606 if (len > strlen (name))
7609 if (strncmp (curr->name, name, len) == 0)
7611 if (strncmp (".end", name + len, 4) == 0)
7613 *result = curr->vma + curr->size;
7617 /* Insert more pseudo-section names here, if you like. */
7625 undefined_reference (const char *reftype, const char *name)
7627 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7632 eval_symbol (bfd_vma *result,
7635 struct elf_final_link_info *flinfo,
7637 Elf_Internal_Sym *isymbuf,
7646 const char *sym = *symp;
7648 bfd_boolean symbol_is_section = FALSE;
7653 if (len < 1 || len > sizeof (symbuf))
7655 bfd_set_error (bfd_error_invalid_operation);
7668 *result = strtoul (sym, (char **) symp, 16);
7672 symbol_is_section = TRUE;
7675 symlen = strtol (sym, (char **) symp, 10);
7676 sym = *symp + 1; /* Skip the trailing ':'. */
7678 if (symend < sym || symlen + 1 > sizeof (symbuf))
7680 bfd_set_error (bfd_error_invalid_operation);
7684 memcpy (symbuf, sym, symlen);
7685 symbuf[symlen] = '\0';
7686 *symp = sym + symlen;
7688 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7689 the symbol as a section, or vice-versa. so we're pretty liberal in our
7690 interpretation here; section means "try section first", not "must be a
7691 section", and likewise with symbol. */
7693 if (symbol_is_section)
7695 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result)
7696 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7697 isymbuf, locsymcount))
7699 undefined_reference ("section", symbuf);
7705 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7706 isymbuf, locsymcount)
7707 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7710 undefined_reference ("symbol", symbuf);
7717 /* All that remains are operators. */
7719 #define UNARY_OP(op) \
7720 if (strncmp (sym, #op, strlen (#op)) == 0) \
7722 sym += strlen (#op); \
7726 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7727 isymbuf, locsymcount, signed_p)) \
7730 *result = op ((bfd_signed_vma) a); \
7736 #define BINARY_OP(op) \
7737 if (strncmp (sym, #op, strlen (#op)) == 0) \
7739 sym += strlen (#op); \
7743 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7744 isymbuf, locsymcount, signed_p)) \
7747 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7748 isymbuf, locsymcount, signed_p)) \
7751 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7781 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7782 bfd_set_error (bfd_error_invalid_operation);
7788 put_value (bfd_vma size,
7789 unsigned long chunksz,
7794 location += (size - chunksz);
7796 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7804 bfd_put_8 (input_bfd, x, location);
7807 bfd_put_16 (input_bfd, x, location);
7810 bfd_put_32 (input_bfd, x, location);
7814 bfd_put_64 (input_bfd, x, location);
7824 get_value (bfd_vma size,
7825 unsigned long chunksz,
7832 /* Sanity checks. */
7833 BFD_ASSERT (chunksz <= sizeof (x)
7836 && (size % chunksz) == 0
7837 && input_bfd != NULL
7838 && location != NULL);
7840 if (chunksz == sizeof (x))
7842 BFD_ASSERT (size == chunksz);
7844 /* Make sure that we do not perform an undefined shift operation.
7845 We know that size == chunksz so there will only be one iteration
7846 of the loop below. */
7850 shift = 8 * chunksz;
7852 for (; size; size -= chunksz, location += chunksz)
7857 x = (x << shift) | bfd_get_8 (input_bfd, location);
7860 x = (x << shift) | bfd_get_16 (input_bfd, location);
7863 x = (x << shift) | bfd_get_32 (input_bfd, location);
7867 x = (x << shift) | bfd_get_64 (input_bfd, location);
7878 decode_complex_addend (unsigned long *start, /* in bits */
7879 unsigned long *oplen, /* in bits */
7880 unsigned long *len, /* in bits */
7881 unsigned long *wordsz, /* in bytes */
7882 unsigned long *chunksz, /* in bytes */
7883 unsigned long *lsb0_p,
7884 unsigned long *signed_p,
7885 unsigned long *trunc_p,
7886 unsigned long encoded)
7888 * start = encoded & 0x3F;
7889 * len = (encoded >> 6) & 0x3F;
7890 * oplen = (encoded >> 12) & 0x3F;
7891 * wordsz = (encoded >> 18) & 0xF;
7892 * chunksz = (encoded >> 22) & 0xF;
7893 * lsb0_p = (encoded >> 27) & 1;
7894 * signed_p = (encoded >> 28) & 1;
7895 * trunc_p = (encoded >> 29) & 1;
7898 bfd_reloc_status_type
7899 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7900 asection *input_section ATTRIBUTE_UNUSED,
7902 Elf_Internal_Rela *rel,
7905 bfd_vma shift, x, mask;
7906 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7907 bfd_reloc_status_type r;
7909 /* Perform this reloc, since it is complex.
7910 (this is not to say that it necessarily refers to a complex
7911 symbol; merely that it is a self-describing CGEN based reloc.
7912 i.e. the addend has the complete reloc information (bit start, end,
7913 word size, etc) encoded within it.). */
7915 decode_complex_addend (&start, &oplen, &len, &wordsz,
7916 &chunksz, &lsb0_p, &signed_p,
7917 &trunc_p, rel->r_addend);
7919 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7922 shift = (start + 1) - len;
7924 shift = (8 * wordsz) - (start + len);
7926 /* FIXME: octets_per_byte. */
7927 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7930 printf ("Doing complex reloc: "
7931 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7932 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7933 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7934 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7935 oplen, (unsigned long) x, (unsigned long) mask,
7936 (unsigned long) relocation);
7941 /* Now do an overflow check. */
7942 r = bfd_check_overflow ((signed_p
7943 ? complain_overflow_signed
7944 : complain_overflow_unsigned),
7945 len, 0, (8 * wordsz),
7949 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7952 printf (" relocation: %8.8lx\n"
7953 " shifted mask: %8.8lx\n"
7954 " shifted/masked reloc: %8.8lx\n"
7955 " result: %8.8lx\n",
7956 (unsigned long) relocation, (unsigned long) (mask << shift),
7957 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
7959 /* FIXME: octets_per_byte. */
7960 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7964 /* qsort comparison functions sorting external relocs by r_offset. */
7967 cmp_ext32l_r_offset (const void *p, const void *q)
7974 const union aligned32 *a
7975 = (const union aligned32 *) ((const Elf32_External_Rel *) p)->r_offset;
7976 const union aligned32 *b
7977 = (const union aligned32 *) ((const Elf32_External_Rel *) q)->r_offset;
7979 uint32_t aval = ( (uint32_t) a->c[0]
7980 | (uint32_t) a->c[1] << 8
7981 | (uint32_t) a->c[2] << 16
7982 | (uint32_t) a->c[3] << 24);
7983 uint32_t bval = ( (uint32_t) b->c[0]
7984 | (uint32_t) b->c[1] << 8
7985 | (uint32_t) b->c[2] << 16
7986 | (uint32_t) b->c[3] << 24);
7989 else if (aval > bval)
7995 cmp_ext32b_r_offset (const void *p, const void *q)
8002 const union aligned32 *a
8003 = (const union aligned32 *) ((const Elf32_External_Rel *) p)->r_offset;
8004 const union aligned32 *b
8005 = (const union aligned32 *) ((const Elf32_External_Rel *) q)->r_offset;
8007 uint32_t aval = ( (uint32_t) a->c[0] << 24
8008 | (uint32_t) a->c[1] << 16
8009 | (uint32_t) a->c[2] << 8
8010 | (uint32_t) a->c[3]);
8011 uint32_t bval = ( (uint32_t) b->c[0] << 24
8012 | (uint32_t) b->c[1] << 16
8013 | (uint32_t) b->c[2] << 8
8014 | (uint32_t) b->c[3]);
8017 else if (aval > bval)
8022 #ifdef BFD_HOST_64_BIT
8024 cmp_ext64l_r_offset (const void *p, const void *q)
8031 const union aligned64 *a
8032 = (const union aligned64 *) ((const Elf64_External_Rel *) p)->r_offset;
8033 const union aligned64 *b
8034 = (const union aligned64 *) ((const Elf64_External_Rel *) q)->r_offset;
8036 uint64_t aval = ( (uint64_t) a->c[0]
8037 | (uint64_t) a->c[1] << 8
8038 | (uint64_t) a->c[2] << 16
8039 | (uint64_t) a->c[3] << 24
8040 | (uint64_t) a->c[4] << 32
8041 | (uint64_t) a->c[5] << 40
8042 | (uint64_t) a->c[6] << 48
8043 | (uint64_t) a->c[7] << 56);
8044 uint64_t bval = ( (uint64_t) b->c[0]
8045 | (uint64_t) b->c[1] << 8
8046 | (uint64_t) b->c[2] << 16
8047 | (uint64_t) b->c[3] << 24
8048 | (uint64_t) b->c[4] << 32
8049 | (uint64_t) b->c[5] << 40
8050 | (uint64_t) b->c[6] << 48
8051 | (uint64_t) b->c[7] << 56);
8054 else if (aval > bval)
8060 cmp_ext64b_r_offset (const void *p, const void *q)
8067 const union aligned64 *a
8068 = (const union aligned64 *) ((const Elf64_External_Rel *) p)->r_offset;
8069 const union aligned64 *b
8070 = (const union aligned64 *) ((const Elf64_External_Rel *) q)->r_offset;
8072 uint64_t aval = ( (uint64_t) a->c[0] << 56
8073 | (uint64_t) a->c[1] << 48
8074 | (uint64_t) a->c[2] << 40
8075 | (uint64_t) a->c[3] << 32
8076 | (uint64_t) a->c[4] << 24
8077 | (uint64_t) a->c[5] << 16
8078 | (uint64_t) a->c[6] << 8
8079 | (uint64_t) a->c[7]);
8080 uint64_t bval = ( (uint64_t) b->c[0] << 56
8081 | (uint64_t) b->c[1] << 48
8082 | (uint64_t) b->c[2] << 40
8083 | (uint64_t) b->c[3] << 32
8084 | (uint64_t) b->c[4] << 24
8085 | (uint64_t) b->c[5] << 16
8086 | (uint64_t) b->c[6] << 8
8087 | (uint64_t) b->c[7]);
8090 else if (aval > bval)
8096 /* When performing a relocatable link, the input relocations are
8097 preserved. But, if they reference global symbols, the indices
8098 referenced must be updated. Update all the relocations found in
8102 elf_link_adjust_relocs (bfd *abfd,
8103 struct bfd_elf_section_reloc_data *reldata,
8107 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8109 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8110 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8111 bfd_vma r_type_mask;
8113 unsigned int count = reldata->count;
8114 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8116 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8118 swap_in = bed->s->swap_reloc_in;
8119 swap_out = bed->s->swap_reloc_out;
8121 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8123 swap_in = bed->s->swap_reloca_in;
8124 swap_out = bed->s->swap_reloca_out;
8129 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8132 if (bed->s->arch_size == 32)
8139 r_type_mask = 0xffffffff;
8143 erela = reldata->hdr->contents;
8144 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8146 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8149 if (*rel_hash == NULL)
8152 BFD_ASSERT ((*rel_hash)->indx >= 0);
8154 (*swap_in) (abfd, erela, irela);
8155 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8156 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8157 | (irela[j].r_info & r_type_mask));
8158 (*swap_out) (abfd, irela, erela);
8163 int (*compare) (const void *, const void *);
8165 if (bed->s->arch_size == 32)
8167 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8168 compare = cmp_ext32l_r_offset;
8169 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8170 compare = cmp_ext32b_r_offset;
8176 #ifdef BFD_HOST_64_BIT
8177 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8178 compare = cmp_ext64l_r_offset;
8179 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8180 compare = cmp_ext64b_r_offset;
8185 qsort (reldata->hdr->contents, count, reldata->hdr->sh_entsize, compare);
8186 free (reldata->hashes);
8187 reldata->hashes = NULL;
8191 struct elf_link_sort_rela
8197 enum elf_reloc_type_class type;
8198 /* We use this as an array of size int_rels_per_ext_rel. */
8199 Elf_Internal_Rela rela[1];
8203 elf_link_sort_cmp1 (const void *A, const void *B)
8205 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8206 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8207 int relativea, relativeb;
8209 relativea = a->type == reloc_class_relative;
8210 relativeb = b->type == reloc_class_relative;
8212 if (relativea < relativeb)
8214 if (relativea > relativeb)
8216 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8218 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8220 if (a->rela->r_offset < b->rela->r_offset)
8222 if (a->rela->r_offset > b->rela->r_offset)
8228 elf_link_sort_cmp2 (const void *A, const void *B)
8230 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8231 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8233 if (a->type < b->type)
8235 if (a->type > b->type)
8237 if (a->u.offset < b->u.offset)
8239 if (a->u.offset > b->u.offset)
8241 if (a->rela->r_offset < b->rela->r_offset)
8243 if (a->rela->r_offset > b->rela->r_offset)
8249 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8251 asection *dynamic_relocs;
8254 bfd_size_type count, size;
8255 size_t i, ret, sort_elt, ext_size;
8256 bfd_byte *sort, *s_non_relative, *p;
8257 struct elf_link_sort_rela *sq;
8258 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8259 int i2e = bed->s->int_rels_per_ext_rel;
8260 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8261 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8262 struct bfd_link_order *lo;
8264 bfd_boolean use_rela;
8266 /* Find a dynamic reloc section. */
8267 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8268 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8269 if (rela_dyn != NULL && rela_dyn->size > 0
8270 && rel_dyn != NULL && rel_dyn->size > 0)
8272 bfd_boolean use_rela_initialised = FALSE;
8274 /* This is just here to stop gcc from complaining.
8275 It's initialization checking code is not perfect. */
8278 /* Both sections are present. Examine the sizes
8279 of the indirect sections to help us choose. */
8280 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8281 if (lo->type == bfd_indirect_link_order)
8283 asection *o = lo->u.indirect.section;
8285 if ((o->size % bed->s->sizeof_rela) == 0)
8287 if ((o->size % bed->s->sizeof_rel) == 0)
8288 /* Section size is divisible by both rel and rela sizes.
8289 It is of no help to us. */
8293 /* Section size is only divisible by rela. */
8294 if (use_rela_initialised && (use_rela == FALSE))
8297 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8298 bfd_set_error (bfd_error_invalid_operation);
8304 use_rela_initialised = TRUE;
8308 else if ((o->size % bed->s->sizeof_rel) == 0)
8310 /* Section size is only divisible by rel. */
8311 if (use_rela_initialised && (use_rela == TRUE))
8314 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8315 bfd_set_error (bfd_error_invalid_operation);
8321 use_rela_initialised = TRUE;
8326 /* The section size is not divisible by either - something is wrong. */
8328 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8329 bfd_set_error (bfd_error_invalid_operation);
8334 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8335 if (lo->type == bfd_indirect_link_order)
8337 asection *o = lo->u.indirect.section;
8339 if ((o->size % bed->s->sizeof_rela) == 0)
8341 if ((o->size % bed->s->sizeof_rel) == 0)
8342 /* Section size is divisible by both rel and rela sizes.
8343 It is of no help to us. */
8347 /* Section size is only divisible by rela. */
8348 if (use_rela_initialised && (use_rela == FALSE))
8351 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8352 bfd_set_error (bfd_error_invalid_operation);
8358 use_rela_initialised = TRUE;
8362 else if ((o->size % bed->s->sizeof_rel) == 0)
8364 /* Section size is only divisible by rel. */
8365 if (use_rela_initialised && (use_rela == TRUE))
8368 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8369 bfd_set_error (bfd_error_invalid_operation);
8375 use_rela_initialised = TRUE;
8380 /* The section size is not divisible by either - something is wrong. */
8382 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8383 bfd_set_error (bfd_error_invalid_operation);
8388 if (! use_rela_initialised)
8392 else if (rela_dyn != NULL && rela_dyn->size > 0)
8394 else if (rel_dyn != NULL && rel_dyn->size > 0)
8401 dynamic_relocs = rela_dyn;
8402 ext_size = bed->s->sizeof_rela;
8403 swap_in = bed->s->swap_reloca_in;
8404 swap_out = bed->s->swap_reloca_out;
8408 dynamic_relocs = rel_dyn;
8409 ext_size = bed->s->sizeof_rel;
8410 swap_in = bed->s->swap_reloc_in;
8411 swap_out = bed->s->swap_reloc_out;
8415 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8416 if (lo->type == bfd_indirect_link_order)
8417 size += lo->u.indirect.section->size;
8419 if (size != dynamic_relocs->size)
8422 sort_elt = (sizeof (struct elf_link_sort_rela)
8423 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8425 count = dynamic_relocs->size / ext_size;
8428 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8432 (*info->callbacks->warning)
8433 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8437 if (bed->s->arch_size == 32)
8438 r_sym_mask = ~(bfd_vma) 0xff;
8440 r_sym_mask = ~(bfd_vma) 0xffffffff;
8442 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8443 if (lo->type == bfd_indirect_link_order)
8445 bfd_byte *erel, *erelend;
8446 asection *o = lo->u.indirect.section;
8448 if (o->contents == NULL && o->size != 0)
8450 /* This is a reloc section that is being handled as a normal
8451 section. See bfd_section_from_shdr. We can't combine
8452 relocs in this case. */
8457 erelend = o->contents + o->size;
8458 /* FIXME: octets_per_byte. */
8459 p = sort + o->output_offset / ext_size * sort_elt;
8461 while (erel < erelend)
8463 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8465 (*swap_in) (abfd, erel, s->rela);
8466 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8467 s->u.sym_mask = r_sym_mask;
8473 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8475 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8477 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8478 if (s->type != reloc_class_relative)
8484 sq = (struct elf_link_sort_rela *) s_non_relative;
8485 for (; i < count; i++, p += sort_elt)
8487 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8488 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8490 sp->u.offset = sq->rela->r_offset;
8493 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8495 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8496 if (lo->type == bfd_indirect_link_order)
8498 bfd_byte *erel, *erelend;
8499 asection *o = lo->u.indirect.section;
8502 erelend = o->contents + o->size;
8503 /* FIXME: octets_per_byte. */
8504 p = sort + o->output_offset / ext_size * sort_elt;
8505 while (erel < erelend)
8507 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8508 (*swap_out) (abfd, s->rela, erel);
8515 *psec = dynamic_relocs;
8519 /* Flush the output symbols to the file. */
8522 elf_link_flush_output_syms (struct elf_final_link_info *flinfo,
8523 const struct elf_backend_data *bed)
8525 if (flinfo->symbuf_count > 0)
8527 Elf_Internal_Shdr *hdr;
8531 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8532 pos = hdr->sh_offset + hdr->sh_size;
8533 amt = flinfo->symbuf_count * bed->s->sizeof_sym;
8534 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) != 0
8535 || bfd_bwrite (flinfo->symbuf, amt, flinfo->output_bfd) != amt)
8538 hdr->sh_size += amt;
8539 flinfo->symbuf_count = 0;
8545 /* Add a symbol to the output symbol table. */
8548 elf_link_output_sym (struct elf_final_link_info *flinfo,
8550 Elf_Internal_Sym *elfsym,
8551 asection *input_sec,
8552 struct elf_link_hash_entry *h)
8555 Elf_External_Sym_Shndx *destshndx;
8556 int (*output_symbol_hook)
8557 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8558 struct elf_link_hash_entry *);
8559 const struct elf_backend_data *bed;
8561 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8563 bed = get_elf_backend_data (flinfo->output_bfd);
8564 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8565 if (output_symbol_hook != NULL)
8567 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8572 if (name == NULL || *name == '\0')
8573 elfsym->st_name = 0;
8574 else if (input_sec->flags & SEC_EXCLUDE)
8575 elfsym->st_name = 0;
8578 elfsym->st_name = (unsigned long) _bfd_stringtab_add (flinfo->symstrtab,
8580 if (elfsym->st_name == (unsigned long) -1)
8584 if (flinfo->symbuf_count >= flinfo->symbuf_size)
8586 if (! elf_link_flush_output_syms (flinfo, bed))
8590 dest = flinfo->symbuf + flinfo->symbuf_count * bed->s->sizeof_sym;
8591 destshndx = flinfo->symshndxbuf;
8592 if (destshndx != NULL)
8594 if (bfd_get_symcount (flinfo->output_bfd) >= flinfo->shndxbuf_size)
8598 amt = flinfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8599 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8601 if (destshndx == NULL)
8603 flinfo->symshndxbuf = destshndx;
8604 memset ((char *) destshndx + amt, 0, amt);
8605 flinfo->shndxbuf_size *= 2;
8607 destshndx += bfd_get_symcount (flinfo->output_bfd);
8610 bed->s->swap_symbol_out (flinfo->output_bfd, elfsym, dest, destshndx);
8611 flinfo->symbuf_count += 1;
8612 bfd_get_symcount (flinfo->output_bfd) += 1;
8617 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8620 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8622 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8623 && sym->st_shndx < SHN_LORESERVE)
8625 /* The gABI doesn't support dynamic symbols in output sections
8627 (*_bfd_error_handler)
8628 (_("%B: Too many sections: %d (>= %d)"),
8629 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8630 bfd_set_error (bfd_error_nonrepresentable_section);
8636 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8637 allowing an unsatisfied unversioned symbol in the DSO to match a
8638 versioned symbol that would normally require an explicit version.
8639 We also handle the case that a DSO references a hidden symbol
8640 which may be satisfied by a versioned symbol in another DSO. */
8643 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8644 const struct elf_backend_data *bed,
8645 struct elf_link_hash_entry *h)
8648 struct elf_link_loaded_list *loaded;
8650 if (!is_elf_hash_table (info->hash))
8653 /* Check indirect symbol. */
8654 while (h->root.type == bfd_link_hash_indirect)
8655 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8657 switch (h->root.type)
8663 case bfd_link_hash_undefined:
8664 case bfd_link_hash_undefweak:
8665 abfd = h->root.u.undef.abfd;
8666 if ((abfd->flags & DYNAMIC) == 0
8667 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8671 case bfd_link_hash_defined:
8672 case bfd_link_hash_defweak:
8673 abfd = h->root.u.def.section->owner;
8676 case bfd_link_hash_common:
8677 abfd = h->root.u.c.p->section->owner;
8680 BFD_ASSERT (abfd != NULL);
8682 for (loaded = elf_hash_table (info)->loaded;
8684 loaded = loaded->next)
8687 Elf_Internal_Shdr *hdr;
8688 bfd_size_type symcount;
8689 bfd_size_type extsymcount;
8690 bfd_size_type extsymoff;
8691 Elf_Internal_Shdr *versymhdr;
8692 Elf_Internal_Sym *isym;
8693 Elf_Internal_Sym *isymend;
8694 Elf_Internal_Sym *isymbuf;
8695 Elf_External_Versym *ever;
8696 Elf_External_Versym *extversym;
8698 input = loaded->abfd;
8700 /* We check each DSO for a possible hidden versioned definition. */
8702 || (input->flags & DYNAMIC) == 0
8703 || elf_dynversym (input) == 0)
8706 hdr = &elf_tdata (input)->dynsymtab_hdr;
8708 symcount = hdr->sh_size / bed->s->sizeof_sym;
8709 if (elf_bad_symtab (input))
8711 extsymcount = symcount;
8716 extsymcount = symcount - hdr->sh_info;
8717 extsymoff = hdr->sh_info;
8720 if (extsymcount == 0)
8723 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8725 if (isymbuf == NULL)
8728 /* Read in any version definitions. */
8729 versymhdr = &elf_tdata (input)->dynversym_hdr;
8730 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8731 if (extversym == NULL)
8734 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8735 || (bfd_bread (extversym, versymhdr->sh_size, input)
8736 != versymhdr->sh_size))
8744 ever = extversym + extsymoff;
8745 isymend = isymbuf + extsymcount;
8746 for (isym = isymbuf; isym < isymend; isym++, ever++)
8749 Elf_Internal_Versym iver;
8750 unsigned short version_index;
8752 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8753 || isym->st_shndx == SHN_UNDEF)
8756 name = bfd_elf_string_from_elf_section (input,
8759 if (strcmp (name, h->root.root.string) != 0)
8762 _bfd_elf_swap_versym_in (input, ever, &iver);
8764 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8766 && h->forced_local))
8768 /* If we have a non-hidden versioned sym, then it should
8769 have provided a definition for the undefined sym unless
8770 it is defined in a non-shared object and forced local.
8775 version_index = iver.vs_vers & VERSYM_VERSION;
8776 if (version_index == 1 || version_index == 2)
8778 /* This is the base or first version. We can use it. */
8792 /* Add an external symbol to the symbol table. This is called from
8793 the hash table traversal routine. When generating a shared object,
8794 we go through the symbol table twice. The first time we output
8795 anything that might have been forced to local scope in a version
8796 script. The second time we output the symbols that are still
8800 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
8802 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
8803 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8804 struct elf_final_link_info *flinfo = eoinfo->flinfo;
8806 Elf_Internal_Sym sym;
8807 asection *input_sec;
8808 const struct elf_backend_data *bed;
8812 if (h->root.type == bfd_link_hash_warning)
8814 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8815 if (h->root.type == bfd_link_hash_new)
8819 /* Decide whether to output this symbol in this pass. */
8820 if (eoinfo->localsyms)
8822 if (!h->forced_local)
8827 if (h->forced_local)
8831 bed = get_elf_backend_data (flinfo->output_bfd);
8833 if (h->root.type == bfd_link_hash_undefined)
8835 /* If we have an undefined symbol reference here then it must have
8836 come from a shared library that is being linked in. (Undefined
8837 references in regular files have already been handled unless
8838 they are in unreferenced sections which are removed by garbage
8840 bfd_boolean ignore_undef = FALSE;
8842 /* Some symbols may be special in that the fact that they're
8843 undefined can be safely ignored - let backend determine that. */
8844 if (bed->elf_backend_ignore_undef_symbol)
8845 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8847 /* If we are reporting errors for this situation then do so now. */
8850 && (!h->ref_regular || flinfo->info->gc_sections)
8851 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
8852 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8854 if (!(flinfo->info->callbacks->undefined_symbol
8855 (flinfo->info, h->root.root.string,
8856 h->ref_regular ? NULL : h->root.u.undef.abfd,
8858 (flinfo->info->unresolved_syms_in_shared_libs
8859 == RM_GENERATE_ERROR))))
8861 bfd_set_error (bfd_error_bad_value);
8862 eoinfo->failed = TRUE;
8868 /* We should also warn if a forced local symbol is referenced from
8869 shared libraries. */
8870 if (!flinfo->info->relocatable
8871 && flinfo->info->executable
8876 && h->ref_dynamic_nonweak
8877 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
8881 struct elf_link_hash_entry *hi = h;
8883 /* Check indirect symbol. */
8884 while (hi->root.type == bfd_link_hash_indirect)
8885 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
8887 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
8888 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
8889 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
8890 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
8892 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
8893 def_bfd = flinfo->output_bfd;
8894 if (hi->root.u.def.section != bfd_abs_section_ptr)
8895 def_bfd = hi->root.u.def.section->owner;
8896 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
8897 h->root.root.string);
8898 bfd_set_error (bfd_error_bad_value);
8899 eoinfo->failed = TRUE;
8903 /* We don't want to output symbols that have never been mentioned by
8904 a regular file, or that we have been told to strip. However, if
8905 h->indx is set to -2, the symbol is used by a reloc and we must
8910 else if ((h->def_dynamic
8912 || h->root.type == bfd_link_hash_new)
8916 else if (flinfo->info->strip == strip_all)
8918 else if (flinfo->info->strip == strip_some
8919 && bfd_hash_lookup (flinfo->info->keep_hash,
8920 h->root.root.string, FALSE, FALSE) == NULL)
8922 else if ((h->root.type == bfd_link_hash_defined
8923 || h->root.type == bfd_link_hash_defweak)
8924 && ((flinfo->info->strip_discarded
8925 && discarded_section (h->root.u.def.section))
8926 || ((h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0
8927 && h->root.u.def.section->owner != NULL
8928 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
8930 else if ((h->root.type == bfd_link_hash_undefined
8931 || h->root.type == bfd_link_hash_undefweak)
8932 && h->root.u.undef.abfd != NULL
8933 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
8936 /* If we're stripping it, and it's not a dynamic symbol, there's
8937 nothing else to do. However, if it is a forced local symbol or
8938 an ifunc symbol we need to give the backend finish_dynamic_symbol
8939 function a chance to make it dynamic. */
8942 && h->type != STT_GNU_IFUNC
8943 && !h->forced_local)
8947 sym.st_size = h->size;
8948 sym.st_other = h->other;
8949 if (h->forced_local)
8951 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8952 /* Turn off visibility on local symbol. */
8953 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8955 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
8956 else if (h->unique_global && h->def_regular)
8957 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8958 else if (h->root.type == bfd_link_hash_undefweak
8959 || h->root.type == bfd_link_hash_defweak)
8960 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8962 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8963 sym.st_target_internal = h->target_internal;
8965 switch (h->root.type)
8968 case bfd_link_hash_new:
8969 case bfd_link_hash_warning:
8973 case bfd_link_hash_undefined:
8974 case bfd_link_hash_undefweak:
8975 input_sec = bfd_und_section_ptr;
8976 sym.st_shndx = SHN_UNDEF;
8979 case bfd_link_hash_defined:
8980 case bfd_link_hash_defweak:
8982 input_sec = h->root.u.def.section;
8983 if (input_sec->output_section != NULL)
8986 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
8987 input_sec->output_section);
8988 if (sym.st_shndx == SHN_BAD)
8990 (*_bfd_error_handler)
8991 (_("%B: could not find output section %A for input section %A"),
8992 flinfo->output_bfd, input_sec->output_section, input_sec);
8993 bfd_set_error (bfd_error_nonrepresentable_section);
8994 eoinfo->failed = TRUE;
8998 /* ELF symbols in relocatable files are section relative,
8999 but in nonrelocatable files they are virtual
9001 sym.st_value = h->root.u.def.value + input_sec->output_offset;
9002 if (!flinfo->info->relocatable)
9004 sym.st_value += input_sec->output_section->vma;
9005 if (h->type == STT_TLS)
9007 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
9008 if (tls_sec != NULL)
9009 sym.st_value -= tls_sec->vma;
9015 BFD_ASSERT (input_sec->owner == NULL
9016 || (input_sec->owner->flags & DYNAMIC) != 0);
9017 sym.st_shndx = SHN_UNDEF;
9018 input_sec = bfd_und_section_ptr;
9023 case bfd_link_hash_common:
9024 input_sec = h->root.u.c.p->section;
9025 sym.st_shndx = bed->common_section_index (input_sec);
9026 sym.st_value = 1 << h->root.u.c.p->alignment_power;
9029 case bfd_link_hash_indirect:
9030 /* These symbols are created by symbol versioning. They point
9031 to the decorated version of the name. For example, if the
9032 symbol foo@@GNU_1.2 is the default, which should be used when
9033 foo is used with no version, then we add an indirect symbol
9034 foo which points to foo@@GNU_1.2. We ignore these symbols,
9035 since the indirected symbol is already in the hash table. */
9039 /* Give the processor backend a chance to tweak the symbol value,
9040 and also to finish up anything that needs to be done for this
9041 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
9042 forced local syms when non-shared is due to a historical quirk.
9043 STT_GNU_IFUNC symbol must go through PLT. */
9044 if ((h->type == STT_GNU_IFUNC
9046 && !flinfo->info->relocatable)
9047 || ((h->dynindx != -1
9049 && ((flinfo->info->shared
9050 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
9051 || h->root.type != bfd_link_hash_undefweak))
9052 || !h->forced_local)
9053 && elf_hash_table (flinfo->info)->dynamic_sections_created))
9055 if (! ((*bed->elf_backend_finish_dynamic_symbol)
9056 (flinfo->output_bfd, flinfo->info, h, &sym)))
9058 eoinfo->failed = TRUE;
9063 /* If we are marking the symbol as undefined, and there are no
9064 non-weak references to this symbol from a regular object, then
9065 mark the symbol as weak undefined; if there are non-weak
9066 references, mark the symbol as strong. We can't do this earlier,
9067 because it might not be marked as undefined until the
9068 finish_dynamic_symbol routine gets through with it. */
9069 if (sym.st_shndx == SHN_UNDEF
9071 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
9072 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
9075 unsigned int type = ELF_ST_TYPE (sym.st_info);
9077 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
9078 if (type == STT_GNU_IFUNC)
9081 if (h->ref_regular_nonweak)
9082 bindtype = STB_GLOBAL;
9084 bindtype = STB_WEAK;
9085 sym.st_info = ELF_ST_INFO (bindtype, type);
9088 /* If this is a symbol defined in a dynamic library, don't use the
9089 symbol size from the dynamic library. Relinking an executable
9090 against a new library may introduce gratuitous changes in the
9091 executable's symbols if we keep the size. */
9092 if (sym.st_shndx == SHN_UNDEF
9097 /* If a non-weak symbol with non-default visibility is not defined
9098 locally, it is a fatal error. */
9099 if (!flinfo->info->relocatable
9100 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
9101 && ELF_ST_BIND (sym.st_info) != STB_WEAK
9102 && h->root.type == bfd_link_hash_undefined
9107 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
9108 msg = _("%B: protected symbol `%s' isn't defined");
9109 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
9110 msg = _("%B: internal symbol `%s' isn't defined");
9112 msg = _("%B: hidden symbol `%s' isn't defined");
9113 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
9114 bfd_set_error (bfd_error_bad_value);
9115 eoinfo->failed = TRUE;
9119 /* If this symbol should be put in the .dynsym section, then put it
9120 there now. We already know the symbol index. We also fill in
9121 the entry in the .hash section. */
9122 if (flinfo->dynsym_sec != NULL
9124 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9128 /* Since there is no version information in the dynamic string,
9129 if there is no version info in symbol version section, we will
9130 have a run-time problem. */
9131 if (h->verinfo.verdef == NULL)
9133 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9135 if (p && p [1] != '\0')
9137 (*_bfd_error_handler)
9138 (_("%B: No symbol version section for versioned symbol `%s'"),
9139 flinfo->output_bfd, h->root.root.string);
9140 eoinfo->failed = TRUE;
9145 sym.st_name = h->dynstr_index;
9146 esym = flinfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
9147 if (!check_dynsym (flinfo->output_bfd, &sym))
9149 eoinfo->failed = TRUE;
9152 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9154 if (flinfo->hash_sec != NULL)
9156 size_t hash_entry_size;
9157 bfd_byte *bucketpos;
9162 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9163 bucket = h->u.elf_hash_value % bucketcount;
9166 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9167 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9168 + (bucket + 2) * hash_entry_size);
9169 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9170 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9172 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9173 ((bfd_byte *) flinfo->hash_sec->contents
9174 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9177 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9179 Elf_Internal_Versym iversym;
9180 Elf_External_Versym *eversym;
9182 if (!h->def_regular)
9184 if (h->verinfo.verdef == NULL
9185 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
9186 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
9187 iversym.vs_vers = 0;
9189 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9193 if (h->verinfo.vertree == NULL)
9194 iversym.vs_vers = 1;
9196 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9197 if (flinfo->info->create_default_symver)
9202 iversym.vs_vers |= VERSYM_HIDDEN;
9204 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9205 eversym += h->dynindx;
9206 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9210 /* If the symbol is undefined, and we didn't output it to .dynsym,
9211 strip it from .symtab too. Obviously we can't do this for
9212 relocatable output or when needed for --emit-relocs. */
9213 else if (input_sec == bfd_und_section_ptr
9215 && !flinfo->info->relocatable)
9217 /* Also strip others that we couldn't earlier due to dynamic symbol
9221 if ((input_sec->flags & SEC_EXCLUDE) != 0)
9224 /* Output a FILE symbol so that following locals are not associated
9225 with the wrong input file. We need one for forced local symbols
9226 if we've seen more than one FILE symbol or when we have exactly
9227 one FILE symbol but global symbols are present in a file other
9228 than the one with the FILE symbol. We also need one if linker
9229 defined symbols are present. In practice these conditions are
9230 always met, so just emit the FILE symbol unconditionally. */
9231 if (eoinfo->localsyms
9232 && !eoinfo->file_sym_done
9233 && eoinfo->flinfo->filesym_count != 0)
9235 Elf_Internal_Sym fsym;
9237 memset (&fsym, 0, sizeof (fsym));
9238 fsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9239 fsym.st_shndx = SHN_ABS;
9240 if (!elf_link_output_sym (eoinfo->flinfo, NULL, &fsym,
9241 bfd_und_section_ptr, NULL))
9244 eoinfo->file_sym_done = TRUE;
9247 indx = bfd_get_symcount (flinfo->output_bfd);
9248 ret = elf_link_output_sym (flinfo, h->root.root.string, &sym, input_sec, h);
9251 eoinfo->failed = TRUE;
9256 else if (h->indx == -2)
9262 /* Return TRUE if special handling is done for relocs in SEC against
9263 symbols defined in discarded sections. */
9266 elf_section_ignore_discarded_relocs (asection *sec)
9268 const struct elf_backend_data *bed;
9270 switch (sec->sec_info_type)
9272 case SEC_INFO_TYPE_STABS:
9273 case SEC_INFO_TYPE_EH_FRAME:
9279 bed = get_elf_backend_data (sec->owner);
9280 if (bed->elf_backend_ignore_discarded_relocs != NULL
9281 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9287 /* Return a mask saying how ld should treat relocations in SEC against
9288 symbols defined in discarded sections. If this function returns
9289 COMPLAIN set, ld will issue a warning message. If this function
9290 returns PRETEND set, and the discarded section was link-once and the
9291 same size as the kept link-once section, ld will pretend that the
9292 symbol was actually defined in the kept section. Otherwise ld will
9293 zero the reloc (at least that is the intent, but some cooperation by
9294 the target dependent code is needed, particularly for REL targets). */
9297 _bfd_elf_default_action_discarded (asection *sec)
9299 if (sec->flags & SEC_DEBUGGING)
9302 if (strcmp (".eh_frame", sec->name) == 0)
9305 if (strcmp (".gcc_except_table", sec->name) == 0)
9308 return COMPLAIN | PRETEND;
9311 /* Find a match between a section and a member of a section group. */
9314 match_group_member (asection *sec, asection *group,
9315 struct bfd_link_info *info)
9317 asection *first = elf_next_in_group (group);
9318 asection *s = first;
9322 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9325 s = elf_next_in_group (s);
9333 /* Check if the kept section of a discarded section SEC can be used
9334 to replace it. Return the replacement if it is OK. Otherwise return
9338 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9342 kept = sec->kept_section;
9345 if ((kept->flags & SEC_GROUP) != 0)
9346 kept = match_group_member (sec, kept, info);
9348 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9349 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9351 sec->kept_section = kept;
9356 /* Link an input file into the linker output file. This function
9357 handles all the sections and relocations of the input file at once.
9358 This is so that we only have to read the local symbols once, and
9359 don't have to keep them in memory. */
9362 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9364 int (*relocate_section)
9365 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9366 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9368 Elf_Internal_Shdr *symtab_hdr;
9371 Elf_Internal_Sym *isymbuf;
9372 Elf_Internal_Sym *isym;
9373 Elf_Internal_Sym *isymend;
9375 asection **ppsection;
9377 const struct elf_backend_data *bed;
9378 struct elf_link_hash_entry **sym_hashes;
9379 bfd_size_type address_size;
9380 bfd_vma r_type_mask;
9382 bfd_boolean have_file_sym = FALSE;
9384 output_bfd = flinfo->output_bfd;
9385 bed = get_elf_backend_data (output_bfd);
9386 relocate_section = bed->elf_backend_relocate_section;
9388 /* If this is a dynamic object, we don't want to do anything here:
9389 we don't want the local symbols, and we don't want the section
9391 if ((input_bfd->flags & DYNAMIC) != 0)
9394 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9395 if (elf_bad_symtab (input_bfd))
9397 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9402 locsymcount = symtab_hdr->sh_info;
9403 extsymoff = symtab_hdr->sh_info;
9406 /* Read the local symbols. */
9407 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9408 if (isymbuf == NULL && locsymcount != 0)
9410 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9411 flinfo->internal_syms,
9412 flinfo->external_syms,
9413 flinfo->locsym_shndx);
9414 if (isymbuf == NULL)
9418 /* Find local symbol sections and adjust values of symbols in
9419 SEC_MERGE sections. Write out those local symbols we know are
9420 going into the output file. */
9421 isymend = isymbuf + locsymcount;
9422 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9424 isym++, pindex++, ppsection++)
9428 Elf_Internal_Sym osym;
9434 if (elf_bad_symtab (input_bfd))
9436 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9443 if (isym->st_shndx == SHN_UNDEF)
9444 isec = bfd_und_section_ptr;
9445 else if (isym->st_shndx == SHN_ABS)
9446 isec = bfd_abs_section_ptr;
9447 else if (isym->st_shndx == SHN_COMMON)
9448 isec = bfd_com_section_ptr;
9451 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9454 /* Don't attempt to output symbols with st_shnx in the
9455 reserved range other than SHN_ABS and SHN_COMMON. */
9459 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9460 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9462 _bfd_merged_section_offset (output_bfd, &isec,
9463 elf_section_data (isec)->sec_info,
9469 /* Don't output the first, undefined, symbol. In fact, don't
9470 output any undefined local symbol. */
9471 if (isec == bfd_und_section_ptr)
9474 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9476 /* We never output section symbols. Instead, we use the
9477 section symbol of the corresponding section in the output
9482 /* If we are stripping all symbols, we don't want to output this
9484 if (flinfo->info->strip == strip_all)
9487 /* If we are discarding all local symbols, we don't want to
9488 output this one. If we are generating a relocatable output
9489 file, then some of the local symbols may be required by
9490 relocs; we output them below as we discover that they are
9492 if (flinfo->info->discard == discard_all)
9495 /* If this symbol is defined in a section which we are
9496 discarding, we don't need to keep it. */
9497 if (isym->st_shndx != SHN_UNDEF
9498 && isym->st_shndx < SHN_LORESERVE
9499 && bfd_section_removed_from_list (output_bfd,
9500 isec->output_section))
9503 /* Get the name of the symbol. */
9504 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9509 /* See if we are discarding symbols with this name. */
9510 if ((flinfo->info->strip == strip_some
9511 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9513 || (((flinfo->info->discard == discard_sec_merge
9514 && (isec->flags & SEC_MERGE) && !flinfo->info->relocatable)
9515 || flinfo->info->discard == discard_l)
9516 && bfd_is_local_label_name (input_bfd, name)))
9519 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9521 if (input_bfd->lto_output)
9522 /* -flto puts a temp file name here. This means builds
9523 are not reproducible. Discard the symbol. */
9525 have_file_sym = TRUE;
9526 flinfo->filesym_count += 1;
9530 /* In the absence of debug info, bfd_find_nearest_line uses
9531 FILE symbols to determine the source file for local
9532 function symbols. Provide a FILE symbol here if input
9533 files lack such, so that their symbols won't be
9534 associated with a previous input file. It's not the
9535 source file, but the best we can do. */
9536 have_file_sym = TRUE;
9537 flinfo->filesym_count += 1;
9538 memset (&osym, 0, sizeof (osym));
9539 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9540 osym.st_shndx = SHN_ABS;
9541 if (!elf_link_output_sym (flinfo,
9542 (input_bfd->lto_output ? NULL
9543 : input_bfd->filename),
9544 &osym, bfd_abs_section_ptr, NULL))
9550 /* Adjust the section index for the output file. */
9551 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9552 isec->output_section);
9553 if (osym.st_shndx == SHN_BAD)
9556 /* ELF symbols in relocatable files are section relative, but
9557 in executable files they are virtual addresses. Note that
9558 this code assumes that all ELF sections have an associated
9559 BFD section with a reasonable value for output_offset; below
9560 we assume that they also have a reasonable value for
9561 output_section. Any special sections must be set up to meet
9562 these requirements. */
9563 osym.st_value += isec->output_offset;
9564 if (!flinfo->info->relocatable)
9566 osym.st_value += isec->output_section->vma;
9567 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9569 /* STT_TLS symbols are relative to PT_TLS segment base. */
9570 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9571 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9575 indx = bfd_get_symcount (output_bfd);
9576 ret = elf_link_output_sym (flinfo, name, &osym, isec, NULL);
9583 if (bed->s->arch_size == 32)
9591 r_type_mask = 0xffffffff;
9596 /* Relocate the contents of each section. */
9597 sym_hashes = elf_sym_hashes (input_bfd);
9598 for (o = input_bfd->sections; o != NULL; o = o->next)
9602 if (! o->linker_mark)
9604 /* This section was omitted from the link. */
9608 if (flinfo->info->relocatable
9609 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9611 /* Deal with the group signature symbol. */
9612 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9613 unsigned long symndx = sec_data->this_hdr.sh_info;
9614 asection *osec = o->output_section;
9616 if (symndx >= locsymcount
9617 || (elf_bad_symtab (input_bfd)
9618 && flinfo->sections[symndx] == NULL))
9620 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9621 while (h->root.type == bfd_link_hash_indirect
9622 || h->root.type == bfd_link_hash_warning)
9623 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9624 /* Arrange for symbol to be output. */
9626 elf_section_data (osec)->this_hdr.sh_info = -2;
9628 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9630 /* We'll use the output section target_index. */
9631 asection *sec = flinfo->sections[symndx]->output_section;
9632 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9636 if (flinfo->indices[symndx] == -1)
9638 /* Otherwise output the local symbol now. */
9639 Elf_Internal_Sym sym = isymbuf[symndx];
9640 asection *sec = flinfo->sections[symndx]->output_section;
9645 name = bfd_elf_string_from_elf_section (input_bfd,
9646 symtab_hdr->sh_link,
9651 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9653 if (sym.st_shndx == SHN_BAD)
9656 sym.st_value += o->output_offset;
9658 indx = bfd_get_symcount (output_bfd);
9659 ret = elf_link_output_sym (flinfo, name, &sym, o, NULL);
9663 flinfo->indices[symndx] = indx;
9667 elf_section_data (osec)->this_hdr.sh_info
9668 = flinfo->indices[symndx];
9672 if ((o->flags & SEC_HAS_CONTENTS) == 0
9673 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9676 if ((o->flags & SEC_LINKER_CREATED) != 0)
9678 /* Section was created by _bfd_elf_link_create_dynamic_sections
9683 /* Get the contents of the section. They have been cached by a
9684 relaxation routine. Note that o is a section in an input
9685 file, so the contents field will not have been set by any of
9686 the routines which work on output files. */
9687 if (elf_section_data (o)->this_hdr.contents != NULL)
9689 contents = elf_section_data (o)->this_hdr.contents;
9690 if (bed->caches_rawsize
9692 && o->rawsize < o->size)
9694 memcpy (flinfo->contents, contents, o->rawsize);
9695 contents = flinfo->contents;
9700 contents = flinfo->contents;
9701 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9705 if ((o->flags & SEC_RELOC) != 0)
9707 Elf_Internal_Rela *internal_relocs;
9708 Elf_Internal_Rela *rel, *relend;
9709 int action_discarded;
9712 /* Get the swapped relocs. */
9714 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
9715 flinfo->internal_relocs, FALSE);
9716 if (internal_relocs == NULL
9717 && o->reloc_count > 0)
9720 /* We need to reverse-copy input .ctors/.dtors sections if
9721 they are placed in .init_array/.finit_array for output. */
9722 if (o->size > address_size
9723 && ((strncmp (o->name, ".ctors", 6) == 0
9724 && strcmp (o->output_section->name,
9725 ".init_array") == 0)
9726 || (strncmp (o->name, ".dtors", 6) == 0
9727 && strcmp (o->output_section->name,
9728 ".fini_array") == 0))
9729 && (o->name[6] == 0 || o->name[6] == '.'))
9731 if (o->size != o->reloc_count * address_size)
9733 (*_bfd_error_handler)
9734 (_("error: %B: size of section %A is not "
9735 "multiple of address size"),
9737 bfd_set_error (bfd_error_on_input);
9740 o->flags |= SEC_ELF_REVERSE_COPY;
9743 action_discarded = -1;
9744 if (!elf_section_ignore_discarded_relocs (o))
9745 action_discarded = (*bed->action_discarded) (o);
9747 /* Run through the relocs evaluating complex reloc symbols and
9748 looking for relocs against symbols from discarded sections
9749 or section symbols from removed link-once sections.
9750 Complain about relocs against discarded sections. Zero
9751 relocs against removed link-once sections. */
9753 rel = internal_relocs;
9754 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9755 for ( ; rel < relend; rel++)
9757 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9758 unsigned int s_type;
9759 asection **ps, *sec;
9760 struct elf_link_hash_entry *h = NULL;
9761 const char *sym_name;
9763 if (r_symndx == STN_UNDEF)
9766 if (r_symndx >= locsymcount
9767 || (elf_bad_symtab (input_bfd)
9768 && flinfo->sections[r_symndx] == NULL))
9770 h = sym_hashes[r_symndx - extsymoff];
9772 /* Badly formatted input files can contain relocs that
9773 reference non-existant symbols. Check here so that
9774 we do not seg fault. */
9779 sprintf_vma (buffer, rel->r_info);
9780 (*_bfd_error_handler)
9781 (_("error: %B contains a reloc (0x%s) for section %A "
9782 "that references a non-existent global symbol"),
9783 input_bfd, o, buffer);
9784 bfd_set_error (bfd_error_bad_value);
9788 while (h->root.type == bfd_link_hash_indirect
9789 || h->root.type == bfd_link_hash_warning)
9790 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9794 /* If a plugin symbol is referenced from a non-IR file,
9795 mark the symbol as undefined. Note that the
9796 linker may attach linker created dynamic sections
9797 to the plugin bfd. Symbols defined in linker
9798 created sections are not plugin symbols. */
9799 if (h->root.non_ir_ref
9800 && (h->root.type == bfd_link_hash_defined
9801 || h->root.type == bfd_link_hash_defweak)
9802 && (h->root.u.def.section->flags
9803 & SEC_LINKER_CREATED) == 0
9804 && h->root.u.def.section->owner != NULL
9805 && (h->root.u.def.section->owner->flags
9808 h->root.type = bfd_link_hash_undefined;
9809 h->root.u.undef.abfd = h->root.u.def.section->owner;
9813 if (h->root.type == bfd_link_hash_defined
9814 || h->root.type == bfd_link_hash_defweak)
9815 ps = &h->root.u.def.section;
9817 sym_name = h->root.root.string;
9821 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9823 s_type = ELF_ST_TYPE (sym->st_info);
9824 ps = &flinfo->sections[r_symndx];
9825 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9829 if ((s_type == STT_RELC || s_type == STT_SRELC)
9830 && !flinfo->info->relocatable)
9833 bfd_vma dot = (rel->r_offset
9834 + o->output_offset + o->output_section->vma);
9836 printf ("Encountered a complex symbol!");
9837 printf (" (input_bfd %s, section %s, reloc %ld\n",
9838 input_bfd->filename, o->name,
9839 (long) (rel - internal_relocs));
9840 printf (" symbol: idx %8.8lx, name %s\n",
9841 r_symndx, sym_name);
9842 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9843 (unsigned long) rel->r_info,
9844 (unsigned long) rel->r_offset);
9846 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
9847 isymbuf, locsymcount, s_type == STT_SRELC))
9850 /* Symbol evaluated OK. Update to absolute value. */
9851 set_symbol_value (input_bfd, isymbuf, locsymcount,
9856 if (action_discarded != -1 && ps != NULL)
9858 /* Complain if the definition comes from a
9859 discarded section. */
9860 if ((sec = *ps) != NULL && discarded_section (sec))
9862 BFD_ASSERT (r_symndx != STN_UNDEF);
9863 if (action_discarded & COMPLAIN)
9864 (*flinfo->info->callbacks->einfo)
9865 (_("%X`%s' referenced in section `%A' of %B: "
9866 "defined in discarded section `%A' of %B\n"),
9867 sym_name, o, input_bfd, sec, sec->owner);
9869 /* Try to do the best we can to support buggy old
9870 versions of gcc. Pretend that the symbol is
9871 really defined in the kept linkonce section.
9872 FIXME: This is quite broken. Modifying the
9873 symbol here means we will be changing all later
9874 uses of the symbol, not just in this section. */
9875 if (action_discarded & PRETEND)
9879 kept = _bfd_elf_check_kept_section (sec,
9891 /* Relocate the section by invoking a back end routine.
9893 The back end routine is responsible for adjusting the
9894 section contents as necessary, and (if using Rela relocs
9895 and generating a relocatable output file) adjusting the
9896 reloc addend as necessary.
9898 The back end routine does not have to worry about setting
9899 the reloc address or the reloc symbol index.
9901 The back end routine is given a pointer to the swapped in
9902 internal symbols, and can access the hash table entries
9903 for the external symbols via elf_sym_hashes (input_bfd).
9905 When generating relocatable output, the back end routine
9906 must handle STB_LOCAL/STT_SECTION symbols specially. The
9907 output symbol is going to be a section symbol
9908 corresponding to the output section, which will require
9909 the addend to be adjusted. */
9911 ret = (*relocate_section) (output_bfd, flinfo->info,
9912 input_bfd, o, contents,
9920 || flinfo->info->relocatable
9921 || flinfo->info->emitrelocations)
9923 Elf_Internal_Rela *irela;
9924 Elf_Internal_Rela *irelaend, *irelamid;
9925 bfd_vma last_offset;
9926 struct elf_link_hash_entry **rel_hash;
9927 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
9928 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
9929 unsigned int next_erel;
9930 bfd_boolean rela_normal;
9931 struct bfd_elf_section_data *esdi, *esdo;
9933 esdi = elf_section_data (o);
9934 esdo = elf_section_data (o->output_section);
9935 rela_normal = FALSE;
9937 /* Adjust the reloc addresses and symbol indices. */
9939 irela = internal_relocs;
9940 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9941 rel_hash = esdo->rel.hashes + esdo->rel.count;
9942 /* We start processing the REL relocs, if any. When we reach
9943 IRELAMID in the loop, we switch to the RELA relocs. */
9945 if (esdi->rel.hdr != NULL)
9946 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
9947 * bed->s->int_rels_per_ext_rel);
9948 rel_hash_list = rel_hash;
9949 rela_hash_list = NULL;
9950 last_offset = o->output_offset;
9951 if (!flinfo->info->relocatable)
9952 last_offset += o->output_section->vma;
9953 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9955 unsigned long r_symndx;
9957 Elf_Internal_Sym sym;
9959 if (next_erel == bed->s->int_rels_per_ext_rel)
9965 if (irela == irelamid)
9967 rel_hash = esdo->rela.hashes + esdo->rela.count;
9968 rela_hash_list = rel_hash;
9969 rela_normal = bed->rela_normal;
9972 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9975 if (irela->r_offset >= (bfd_vma) -2)
9977 /* This is a reloc for a deleted entry or somesuch.
9978 Turn it into an R_*_NONE reloc, at the same
9979 offset as the last reloc. elf_eh_frame.c and
9980 bfd_elf_discard_info rely on reloc offsets
9982 irela->r_offset = last_offset;
9984 irela->r_addend = 0;
9988 irela->r_offset += o->output_offset;
9990 /* Relocs in an executable have to be virtual addresses. */
9991 if (!flinfo->info->relocatable)
9992 irela->r_offset += o->output_section->vma;
9994 last_offset = irela->r_offset;
9996 r_symndx = irela->r_info >> r_sym_shift;
9997 if (r_symndx == STN_UNDEF)
10000 if (r_symndx >= locsymcount
10001 || (elf_bad_symtab (input_bfd)
10002 && flinfo->sections[r_symndx] == NULL))
10004 struct elf_link_hash_entry *rh;
10005 unsigned long indx;
10007 /* This is a reloc against a global symbol. We
10008 have not yet output all the local symbols, so
10009 we do not know the symbol index of any global
10010 symbol. We set the rel_hash entry for this
10011 reloc to point to the global hash table entry
10012 for this symbol. The symbol index is then
10013 set at the end of bfd_elf_final_link. */
10014 indx = r_symndx - extsymoff;
10015 rh = elf_sym_hashes (input_bfd)[indx];
10016 while (rh->root.type == bfd_link_hash_indirect
10017 || rh->root.type == bfd_link_hash_warning)
10018 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
10020 /* Setting the index to -2 tells
10021 elf_link_output_extsym that this symbol is
10022 used by a reloc. */
10023 BFD_ASSERT (rh->indx < 0);
10031 /* This is a reloc against a local symbol. */
10034 sym = isymbuf[r_symndx];
10035 sec = flinfo->sections[r_symndx];
10036 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
10038 /* I suppose the backend ought to fill in the
10039 section of any STT_SECTION symbol against a
10040 processor specific section. */
10041 r_symndx = STN_UNDEF;
10042 if (bfd_is_abs_section (sec))
10044 else if (sec == NULL || sec->owner == NULL)
10046 bfd_set_error (bfd_error_bad_value);
10051 asection *osec = sec->output_section;
10053 /* If we have discarded a section, the output
10054 section will be the absolute section. In
10055 case of discarded SEC_MERGE sections, use
10056 the kept section. relocate_section should
10057 have already handled discarded linkonce
10059 if (bfd_is_abs_section (osec)
10060 && sec->kept_section != NULL
10061 && sec->kept_section->output_section != NULL)
10063 osec = sec->kept_section->output_section;
10064 irela->r_addend -= osec->vma;
10067 if (!bfd_is_abs_section (osec))
10069 r_symndx = osec->target_index;
10070 if (r_symndx == STN_UNDEF)
10072 irela->r_addend += osec->vma;
10073 osec = _bfd_nearby_section (output_bfd, osec,
10075 irela->r_addend -= osec->vma;
10076 r_symndx = osec->target_index;
10081 /* Adjust the addend according to where the
10082 section winds up in the output section. */
10084 irela->r_addend += sec->output_offset;
10088 if (flinfo->indices[r_symndx] == -1)
10090 unsigned long shlink;
10095 if (flinfo->info->strip == strip_all)
10097 /* You can't do ld -r -s. */
10098 bfd_set_error (bfd_error_invalid_operation);
10102 /* This symbol was skipped earlier, but
10103 since it is needed by a reloc, we
10104 must output it now. */
10105 shlink = symtab_hdr->sh_link;
10106 name = (bfd_elf_string_from_elf_section
10107 (input_bfd, shlink, sym.st_name));
10111 osec = sec->output_section;
10113 _bfd_elf_section_from_bfd_section (output_bfd,
10115 if (sym.st_shndx == SHN_BAD)
10118 sym.st_value += sec->output_offset;
10119 if (!flinfo->info->relocatable)
10121 sym.st_value += osec->vma;
10122 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
10124 /* STT_TLS symbols are relative to PT_TLS
10126 BFD_ASSERT (elf_hash_table (flinfo->info)
10127 ->tls_sec != NULL);
10128 sym.st_value -= (elf_hash_table (flinfo->info)
10133 indx = bfd_get_symcount (output_bfd);
10134 ret = elf_link_output_sym (flinfo, name, &sym, sec,
10139 flinfo->indices[r_symndx] = indx;
10144 r_symndx = flinfo->indices[r_symndx];
10147 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
10148 | (irela->r_info & r_type_mask));
10151 /* Swap out the relocs. */
10152 input_rel_hdr = esdi->rel.hdr;
10153 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
10155 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10160 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
10161 * bed->s->int_rels_per_ext_rel);
10162 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
10165 input_rela_hdr = esdi->rela.hdr;
10166 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
10168 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10177 /* Write out the modified section contents. */
10178 if (bed->elf_backend_write_section
10179 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
10182 /* Section written out. */
10184 else switch (o->sec_info_type)
10186 case SEC_INFO_TYPE_STABS:
10187 if (! (_bfd_write_section_stabs
10189 &elf_hash_table (flinfo->info)->stab_info,
10190 o, &elf_section_data (o)->sec_info, contents)))
10193 case SEC_INFO_TYPE_MERGE:
10194 if (! _bfd_write_merged_section (output_bfd, o,
10195 elf_section_data (o)->sec_info))
10198 case SEC_INFO_TYPE_EH_FRAME:
10200 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10207 /* FIXME: octets_per_byte. */
10208 if (! (o->flags & SEC_EXCLUDE))
10210 file_ptr offset = (file_ptr) o->output_offset;
10211 bfd_size_type todo = o->size;
10212 if ((o->flags & SEC_ELF_REVERSE_COPY))
10214 /* Reverse-copy input section to output. */
10217 todo -= address_size;
10218 if (! bfd_set_section_contents (output_bfd,
10226 offset += address_size;
10230 else if (! bfd_set_section_contents (output_bfd,
10244 /* Generate a reloc when linking an ELF file. This is a reloc
10245 requested by the linker, and does not come from any input file. This
10246 is used to build constructor and destructor tables when linking
10250 elf_reloc_link_order (bfd *output_bfd,
10251 struct bfd_link_info *info,
10252 asection *output_section,
10253 struct bfd_link_order *link_order)
10255 reloc_howto_type *howto;
10259 struct bfd_elf_section_reloc_data *reldata;
10260 struct elf_link_hash_entry **rel_hash_ptr;
10261 Elf_Internal_Shdr *rel_hdr;
10262 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10263 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10266 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10268 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10271 bfd_set_error (bfd_error_bad_value);
10275 addend = link_order->u.reloc.p->addend;
10278 reldata = &esdo->rel;
10279 else if (esdo->rela.hdr)
10280 reldata = &esdo->rela;
10287 /* Figure out the symbol index. */
10288 rel_hash_ptr = reldata->hashes + reldata->count;
10289 if (link_order->type == bfd_section_reloc_link_order)
10291 indx = link_order->u.reloc.p->u.section->target_index;
10292 BFD_ASSERT (indx != 0);
10293 *rel_hash_ptr = NULL;
10297 struct elf_link_hash_entry *h;
10299 /* Treat a reloc against a defined symbol as though it were
10300 actually against the section. */
10301 h = ((struct elf_link_hash_entry *)
10302 bfd_wrapped_link_hash_lookup (output_bfd, info,
10303 link_order->u.reloc.p->u.name,
10304 FALSE, FALSE, TRUE));
10306 && (h->root.type == bfd_link_hash_defined
10307 || h->root.type == bfd_link_hash_defweak))
10311 section = h->root.u.def.section;
10312 indx = section->output_section->target_index;
10313 *rel_hash_ptr = NULL;
10314 /* It seems that we ought to add the symbol value to the
10315 addend here, but in practice it has already been added
10316 because it was passed to constructor_callback. */
10317 addend += section->output_section->vma + section->output_offset;
10319 else if (h != NULL)
10321 /* Setting the index to -2 tells elf_link_output_extsym that
10322 this symbol is used by a reloc. */
10329 if (! ((*info->callbacks->unattached_reloc)
10330 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10336 /* If this is an inplace reloc, we must write the addend into the
10338 if (howto->partial_inplace && addend != 0)
10340 bfd_size_type size;
10341 bfd_reloc_status_type rstat;
10344 const char *sym_name;
10346 size = (bfd_size_type) bfd_get_reloc_size (howto);
10347 buf = (bfd_byte *) bfd_zmalloc (size);
10348 if (buf == NULL && size != 0)
10350 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10357 case bfd_reloc_outofrange:
10360 case bfd_reloc_overflow:
10361 if (link_order->type == bfd_section_reloc_link_order)
10362 sym_name = bfd_section_name (output_bfd,
10363 link_order->u.reloc.p->u.section);
10365 sym_name = link_order->u.reloc.p->u.name;
10366 if (! ((*info->callbacks->reloc_overflow)
10367 (info, NULL, sym_name, howto->name, addend, NULL,
10368 NULL, (bfd_vma) 0)))
10375 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10376 link_order->offset, size);
10382 /* The address of a reloc is relative to the section in a
10383 relocatable file, and is a virtual address in an executable
10385 offset = link_order->offset;
10386 if (! info->relocatable)
10387 offset += output_section->vma;
10389 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10391 irel[i].r_offset = offset;
10392 irel[i].r_info = 0;
10393 irel[i].r_addend = 0;
10395 if (bed->s->arch_size == 32)
10396 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10398 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10400 rel_hdr = reldata->hdr;
10401 erel = rel_hdr->contents;
10402 if (rel_hdr->sh_type == SHT_REL)
10404 erel += reldata->count * bed->s->sizeof_rel;
10405 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10409 irel[0].r_addend = addend;
10410 erel += reldata->count * bed->s->sizeof_rela;
10411 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10420 /* Get the output vma of the section pointed to by the sh_link field. */
10423 elf_get_linked_section_vma (struct bfd_link_order *p)
10425 Elf_Internal_Shdr **elf_shdrp;
10429 s = p->u.indirect.section;
10430 elf_shdrp = elf_elfsections (s->owner);
10431 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10432 elfsec = elf_shdrp[elfsec]->sh_link;
10434 The Intel C compiler generates SHT_IA_64_UNWIND with
10435 SHF_LINK_ORDER. But it doesn't set the sh_link or
10436 sh_info fields. Hence we could get the situation
10437 where elfsec is 0. */
10440 const struct elf_backend_data *bed
10441 = get_elf_backend_data (s->owner);
10442 if (bed->link_order_error_handler)
10443 bed->link_order_error_handler
10444 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10449 s = elf_shdrp[elfsec]->bfd_section;
10450 return s->output_section->vma + s->output_offset;
10455 /* Compare two sections based on the locations of the sections they are
10456 linked to. Used by elf_fixup_link_order. */
10459 compare_link_order (const void * a, const void * b)
10464 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10465 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10468 return apos > bpos;
10472 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10473 order as their linked sections. Returns false if this could not be done
10474 because an output section includes both ordered and unordered
10475 sections. Ideally we'd do this in the linker proper. */
10478 elf_fixup_link_order (bfd *abfd, asection *o)
10480 int seen_linkorder;
10483 struct bfd_link_order *p;
10485 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10487 struct bfd_link_order **sections;
10488 asection *s, *other_sec, *linkorder_sec;
10492 linkorder_sec = NULL;
10494 seen_linkorder = 0;
10495 for (p = o->map_head.link_order; p != NULL; p = p->next)
10497 if (p->type == bfd_indirect_link_order)
10499 s = p->u.indirect.section;
10501 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10502 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10503 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10504 && elfsec < elf_numsections (sub)
10505 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10506 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10520 if (seen_other && seen_linkorder)
10522 if (other_sec && linkorder_sec)
10523 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10525 linkorder_sec->owner, other_sec,
10528 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10530 bfd_set_error (bfd_error_bad_value);
10535 if (!seen_linkorder)
10538 sections = (struct bfd_link_order **)
10539 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10540 if (sections == NULL)
10542 seen_linkorder = 0;
10544 for (p = o->map_head.link_order; p != NULL; p = p->next)
10546 sections[seen_linkorder++] = p;
10548 /* Sort the input sections in the order of their linked section. */
10549 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10550 compare_link_order);
10552 /* Change the offsets of the sections. */
10554 for (n = 0; n < seen_linkorder; n++)
10556 s = sections[n]->u.indirect.section;
10557 offset &= ~(bfd_vma) 0 << s->alignment_power;
10558 s->output_offset = offset;
10559 sections[n]->offset = offset;
10560 /* FIXME: octets_per_byte. */
10561 offset += sections[n]->size;
10569 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10573 if (flinfo->symstrtab != NULL)
10574 _bfd_stringtab_free (flinfo->symstrtab);
10575 if (flinfo->contents != NULL)
10576 free (flinfo->contents);
10577 if (flinfo->external_relocs != NULL)
10578 free (flinfo->external_relocs);
10579 if (flinfo->internal_relocs != NULL)
10580 free (flinfo->internal_relocs);
10581 if (flinfo->external_syms != NULL)
10582 free (flinfo->external_syms);
10583 if (flinfo->locsym_shndx != NULL)
10584 free (flinfo->locsym_shndx);
10585 if (flinfo->internal_syms != NULL)
10586 free (flinfo->internal_syms);
10587 if (flinfo->indices != NULL)
10588 free (flinfo->indices);
10589 if (flinfo->sections != NULL)
10590 free (flinfo->sections);
10591 if (flinfo->symbuf != NULL)
10592 free (flinfo->symbuf);
10593 if (flinfo->symshndxbuf != NULL)
10594 free (flinfo->symshndxbuf);
10595 for (o = obfd->sections; o != NULL; o = o->next)
10597 struct bfd_elf_section_data *esdo = elf_section_data (o);
10598 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10599 free (esdo->rel.hashes);
10600 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10601 free (esdo->rela.hashes);
10605 /* Do the final step of an ELF link. */
10608 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10610 bfd_boolean dynamic;
10611 bfd_boolean emit_relocs;
10613 struct elf_final_link_info flinfo;
10615 struct bfd_link_order *p;
10617 bfd_size_type max_contents_size;
10618 bfd_size_type max_external_reloc_size;
10619 bfd_size_type max_internal_reloc_count;
10620 bfd_size_type max_sym_count;
10621 bfd_size_type max_sym_shndx_count;
10622 Elf_Internal_Sym elfsym;
10624 Elf_Internal_Shdr *symtab_hdr;
10625 Elf_Internal_Shdr *symtab_shndx_hdr;
10626 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10627 struct elf_outext_info eoinfo;
10628 bfd_boolean merged;
10629 size_t relativecount = 0;
10630 asection *reldyn = 0;
10632 asection *attr_section = NULL;
10633 bfd_vma attr_size = 0;
10634 const char *std_attrs_section;
10636 if (! is_elf_hash_table (info->hash))
10640 abfd->flags |= DYNAMIC;
10642 dynamic = elf_hash_table (info)->dynamic_sections_created;
10643 dynobj = elf_hash_table (info)->dynobj;
10645 emit_relocs = (info->relocatable
10646 || info->emitrelocations);
10648 flinfo.info = info;
10649 flinfo.output_bfd = abfd;
10650 flinfo.symstrtab = _bfd_elf_stringtab_init ();
10651 if (flinfo.symstrtab == NULL)
10656 flinfo.dynsym_sec = NULL;
10657 flinfo.hash_sec = NULL;
10658 flinfo.symver_sec = NULL;
10662 flinfo.dynsym_sec = bfd_get_linker_section (dynobj, ".dynsym");
10663 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
10664 /* Note that dynsym_sec can be NULL (on VMS). */
10665 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
10666 /* Note that it is OK if symver_sec is NULL. */
10669 flinfo.contents = NULL;
10670 flinfo.external_relocs = NULL;
10671 flinfo.internal_relocs = NULL;
10672 flinfo.external_syms = NULL;
10673 flinfo.locsym_shndx = NULL;
10674 flinfo.internal_syms = NULL;
10675 flinfo.indices = NULL;
10676 flinfo.sections = NULL;
10677 flinfo.symbuf = NULL;
10678 flinfo.symshndxbuf = NULL;
10679 flinfo.symbuf_count = 0;
10680 flinfo.shndxbuf_size = 0;
10681 flinfo.filesym_count = 0;
10683 /* The object attributes have been merged. Remove the input
10684 sections from the link, and set the contents of the output
10686 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10687 for (o = abfd->sections; o != NULL; o = o->next)
10689 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10690 || strcmp (o->name, ".gnu.attributes") == 0)
10692 for (p = o->map_head.link_order; p != NULL; p = p->next)
10694 asection *input_section;
10696 if (p->type != bfd_indirect_link_order)
10698 input_section = p->u.indirect.section;
10699 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10700 elf_link_input_bfd ignores this section. */
10701 input_section->flags &= ~SEC_HAS_CONTENTS;
10704 attr_size = bfd_elf_obj_attr_size (abfd);
10707 bfd_set_section_size (abfd, o, attr_size);
10709 /* Skip this section later on. */
10710 o->map_head.link_order = NULL;
10713 o->flags |= SEC_EXCLUDE;
10717 /* Count up the number of relocations we will output for each output
10718 section, so that we know the sizes of the reloc sections. We
10719 also figure out some maximum sizes. */
10720 max_contents_size = 0;
10721 max_external_reloc_size = 0;
10722 max_internal_reloc_count = 0;
10724 max_sym_shndx_count = 0;
10726 for (o = abfd->sections; o != NULL; o = o->next)
10728 struct bfd_elf_section_data *esdo = elf_section_data (o);
10729 o->reloc_count = 0;
10731 for (p = o->map_head.link_order; p != NULL; p = p->next)
10733 unsigned int reloc_count = 0;
10734 struct bfd_elf_section_data *esdi = NULL;
10736 if (p->type == bfd_section_reloc_link_order
10737 || p->type == bfd_symbol_reloc_link_order)
10739 else if (p->type == bfd_indirect_link_order)
10743 sec = p->u.indirect.section;
10744 esdi = elf_section_data (sec);
10746 /* Mark all sections which are to be included in the
10747 link. This will normally be every section. We need
10748 to do this so that we can identify any sections which
10749 the linker has decided to not include. */
10750 sec->linker_mark = TRUE;
10752 if (sec->flags & SEC_MERGE)
10755 if (esdo->this_hdr.sh_type == SHT_REL
10756 || esdo->this_hdr.sh_type == SHT_RELA)
10757 /* Some backends use reloc_count in relocation sections
10758 to count particular types of relocs. Of course,
10759 reloc sections themselves can't have relocations. */
10761 else if (info->relocatable || info->emitrelocations)
10762 reloc_count = sec->reloc_count;
10763 else if (bed->elf_backend_count_relocs)
10764 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10766 if (sec->rawsize > max_contents_size)
10767 max_contents_size = sec->rawsize;
10768 if (sec->size > max_contents_size)
10769 max_contents_size = sec->size;
10771 /* We are interested in just local symbols, not all
10773 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10774 && (sec->owner->flags & DYNAMIC) == 0)
10778 if (elf_bad_symtab (sec->owner))
10779 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10780 / bed->s->sizeof_sym);
10782 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10784 if (sym_count > max_sym_count)
10785 max_sym_count = sym_count;
10787 if (sym_count > max_sym_shndx_count
10788 && elf_symtab_shndx (sec->owner) != 0)
10789 max_sym_shndx_count = sym_count;
10791 if ((sec->flags & SEC_RELOC) != 0)
10793 size_t ext_size = 0;
10795 if (esdi->rel.hdr != NULL)
10796 ext_size = esdi->rel.hdr->sh_size;
10797 if (esdi->rela.hdr != NULL)
10798 ext_size += esdi->rela.hdr->sh_size;
10800 if (ext_size > max_external_reloc_size)
10801 max_external_reloc_size = ext_size;
10802 if (sec->reloc_count > max_internal_reloc_count)
10803 max_internal_reloc_count = sec->reloc_count;
10808 if (reloc_count == 0)
10811 o->reloc_count += reloc_count;
10813 if (p->type == bfd_indirect_link_order
10814 && (info->relocatable || info->emitrelocations))
10817 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
10818 if (esdi->rela.hdr)
10819 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
10824 esdo->rela.count += reloc_count;
10826 esdo->rel.count += reloc_count;
10830 if (o->reloc_count > 0)
10831 o->flags |= SEC_RELOC;
10834 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10835 set it (this is probably a bug) and if it is set
10836 assign_section_numbers will create a reloc section. */
10837 o->flags &=~ SEC_RELOC;
10840 /* If the SEC_ALLOC flag is not set, force the section VMA to
10841 zero. This is done in elf_fake_sections as well, but forcing
10842 the VMA to 0 here will ensure that relocs against these
10843 sections are handled correctly. */
10844 if ((o->flags & SEC_ALLOC) == 0
10845 && ! o->user_set_vma)
10849 if (! info->relocatable && merged)
10850 elf_link_hash_traverse (elf_hash_table (info),
10851 _bfd_elf_link_sec_merge_syms, abfd);
10853 /* Figure out the file positions for everything but the symbol table
10854 and the relocs. We set symcount to force assign_section_numbers
10855 to create a symbol table. */
10856 bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
10857 BFD_ASSERT (! abfd->output_has_begun);
10858 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10861 /* Set sizes, and assign file positions for reloc sections. */
10862 for (o = abfd->sections; o != NULL; o = o->next)
10864 struct bfd_elf_section_data *esdo = elf_section_data (o);
10865 if ((o->flags & SEC_RELOC) != 0)
10868 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
10872 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
10876 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10877 to count upwards while actually outputting the relocations. */
10878 esdo->rel.count = 0;
10879 esdo->rela.count = 0;
10882 /* We have now assigned file positions for all the sections except
10883 .symtab, .strtab, and non-loaded reloc sections. We start the
10884 .symtab section at the current file position, and write directly
10885 to it. We build the .strtab section in memory. */
10886 bfd_get_symcount (abfd) = 0;
10887 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10888 /* sh_name is set in prep_headers. */
10889 symtab_hdr->sh_type = SHT_SYMTAB;
10890 /* sh_flags, sh_addr and sh_size all start off zero. */
10891 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10892 /* sh_link is set in assign_section_numbers. */
10893 /* sh_info is set below. */
10894 /* sh_offset is set just below. */
10895 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10897 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10898 continuously seeking to the right position in the file. */
10899 if (! info->keep_memory || max_sym_count < 20)
10900 flinfo.symbuf_size = 20;
10902 flinfo.symbuf_size = max_sym_count;
10903 amt = flinfo.symbuf_size;
10904 amt *= bed->s->sizeof_sym;
10905 flinfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10906 if (flinfo.symbuf == NULL)
10908 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10910 /* Wild guess at number of output symbols. realloc'd as needed. */
10911 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10912 flinfo.shndxbuf_size = amt;
10913 amt *= sizeof (Elf_External_Sym_Shndx);
10914 flinfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10915 if (flinfo.symshndxbuf == NULL)
10919 if (info->strip != strip_all || emit_relocs)
10921 file_ptr off = elf_next_file_pos (abfd);
10923 _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10925 /* Note that at this point elf_next_file_pos (abfd) is
10926 incorrect. We do not yet know the size of the .symtab section.
10927 We correct next_file_pos below, after we do know the size. */
10929 /* Start writing out the symbol table. The first symbol is always a
10931 elfsym.st_value = 0;
10932 elfsym.st_size = 0;
10933 elfsym.st_info = 0;
10934 elfsym.st_other = 0;
10935 elfsym.st_shndx = SHN_UNDEF;
10936 elfsym.st_target_internal = 0;
10937 if (elf_link_output_sym (&flinfo, NULL, &elfsym, bfd_und_section_ptr,
10941 /* Output a symbol for each section. We output these even if we are
10942 discarding local symbols, since they are used for relocs. These
10943 symbols have no names. We store the index of each one in the
10944 index field of the section, so that we can find it again when
10945 outputting relocs. */
10947 elfsym.st_size = 0;
10948 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10949 elfsym.st_other = 0;
10950 elfsym.st_value = 0;
10951 elfsym.st_target_internal = 0;
10952 for (i = 1; i < elf_numsections (abfd); i++)
10954 o = bfd_section_from_elf_index (abfd, i);
10957 o->target_index = bfd_get_symcount (abfd);
10958 elfsym.st_shndx = i;
10959 if (!info->relocatable)
10960 elfsym.st_value = o->vma;
10961 if (elf_link_output_sym (&flinfo, NULL, &elfsym, o, NULL) != 1)
10967 /* Allocate some memory to hold information read in from the input
10969 if (max_contents_size != 0)
10971 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10972 if (flinfo.contents == NULL)
10976 if (max_external_reloc_size != 0)
10978 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
10979 if (flinfo.external_relocs == NULL)
10983 if (max_internal_reloc_count != 0)
10985 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10986 amt *= sizeof (Elf_Internal_Rela);
10987 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10988 if (flinfo.internal_relocs == NULL)
10992 if (max_sym_count != 0)
10994 amt = max_sym_count * bed->s->sizeof_sym;
10995 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
10996 if (flinfo.external_syms == NULL)
10999 amt = max_sym_count * sizeof (Elf_Internal_Sym);
11000 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
11001 if (flinfo.internal_syms == NULL)
11004 amt = max_sym_count * sizeof (long);
11005 flinfo.indices = (long int *) bfd_malloc (amt);
11006 if (flinfo.indices == NULL)
11009 amt = max_sym_count * sizeof (asection *);
11010 flinfo.sections = (asection **) bfd_malloc (amt);
11011 if (flinfo.sections == NULL)
11015 if (max_sym_shndx_count != 0)
11017 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
11018 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
11019 if (flinfo.locsym_shndx == NULL)
11023 if (elf_hash_table (info)->tls_sec)
11025 bfd_vma base, end = 0;
11028 for (sec = elf_hash_table (info)->tls_sec;
11029 sec && (sec->flags & SEC_THREAD_LOCAL);
11032 bfd_size_type size = sec->size;
11035 && (sec->flags & SEC_HAS_CONTENTS) == 0)
11037 struct bfd_link_order *ord = sec->map_tail.link_order;
11040 size = ord->offset + ord->size;
11042 end = sec->vma + size;
11044 base = elf_hash_table (info)->tls_sec->vma;
11045 /* Only align end of TLS section if static TLS doesn't have special
11046 alignment requirements. */
11047 if (bed->static_tls_alignment == 1)
11048 end = align_power (end,
11049 elf_hash_table (info)->tls_sec->alignment_power);
11050 elf_hash_table (info)->tls_size = end - base;
11053 /* Reorder SHF_LINK_ORDER sections. */
11054 for (o = abfd->sections; o != NULL; o = o->next)
11056 if (!elf_fixup_link_order (abfd, o))
11060 /* Since ELF permits relocations to be against local symbols, we
11061 must have the local symbols available when we do the relocations.
11062 Since we would rather only read the local symbols once, and we
11063 would rather not keep them in memory, we handle all the
11064 relocations for a single input file at the same time.
11066 Unfortunately, there is no way to know the total number of local
11067 symbols until we have seen all of them, and the local symbol
11068 indices precede the global symbol indices. This means that when
11069 we are generating relocatable output, and we see a reloc against
11070 a global symbol, we can not know the symbol index until we have
11071 finished examining all the local symbols to see which ones we are
11072 going to output. To deal with this, we keep the relocations in
11073 memory, and don't output them until the end of the link. This is
11074 an unfortunate waste of memory, but I don't see a good way around
11075 it. Fortunately, it only happens when performing a relocatable
11076 link, which is not the common case. FIXME: If keep_memory is set
11077 we could write the relocs out and then read them again; I don't
11078 know how bad the memory loss will be. */
11080 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11081 sub->output_has_begun = FALSE;
11082 for (o = abfd->sections; o != NULL; o = o->next)
11084 for (p = o->map_head.link_order; p != NULL; p = p->next)
11086 if (p->type == bfd_indirect_link_order
11087 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
11088 == bfd_target_elf_flavour)
11089 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
11091 if (! sub->output_has_begun)
11093 if (! elf_link_input_bfd (&flinfo, sub))
11095 sub->output_has_begun = TRUE;
11098 else if (p->type == bfd_section_reloc_link_order
11099 || p->type == bfd_symbol_reloc_link_order)
11101 if (! elf_reloc_link_order (abfd, info, o, p))
11106 if (! _bfd_default_link_order (abfd, info, o, p))
11108 if (p->type == bfd_indirect_link_order
11109 && (bfd_get_flavour (sub)
11110 == bfd_target_elf_flavour)
11111 && (elf_elfheader (sub)->e_ident[EI_CLASS]
11112 != bed->s->elfclass))
11114 const char *iclass, *oclass;
11116 if (bed->s->elfclass == ELFCLASS64)
11118 iclass = "ELFCLASS32";
11119 oclass = "ELFCLASS64";
11123 iclass = "ELFCLASS64";
11124 oclass = "ELFCLASS32";
11127 bfd_set_error (bfd_error_wrong_format);
11128 (*_bfd_error_handler)
11129 (_("%B: file class %s incompatible with %s"),
11130 sub, iclass, oclass);
11139 /* Free symbol buffer if needed. */
11140 if (!info->reduce_memory_overheads)
11142 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11143 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
11144 && elf_tdata (sub)->symbuf)
11146 free (elf_tdata (sub)->symbuf);
11147 elf_tdata (sub)->symbuf = NULL;
11151 /* Output any global symbols that got converted to local in a
11152 version script or due to symbol visibility. We do this in a
11153 separate step since ELF requires all local symbols to appear
11154 prior to any global symbols. FIXME: We should only do this if
11155 some global symbols were, in fact, converted to become local.
11156 FIXME: Will this work correctly with the Irix 5 linker? */
11157 eoinfo.failed = FALSE;
11158 eoinfo.flinfo = &flinfo;
11159 eoinfo.localsyms = TRUE;
11160 eoinfo.file_sym_done = FALSE;
11161 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11165 /* If backend needs to output some local symbols not present in the hash
11166 table, do it now. */
11167 if (bed->elf_backend_output_arch_local_syms
11168 && (info->strip != strip_all || emit_relocs))
11170 typedef int (*out_sym_func)
11171 (void *, const char *, Elf_Internal_Sym *, asection *,
11172 struct elf_link_hash_entry *);
11174 if (! ((*bed->elf_backend_output_arch_local_syms)
11175 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11179 /* That wrote out all the local symbols. Finish up the symbol table
11180 with the global symbols. Even if we want to strip everything we
11181 can, we still need to deal with those global symbols that got
11182 converted to local in a version script. */
11184 /* The sh_info field records the index of the first non local symbol. */
11185 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11188 && flinfo.dynsym_sec != NULL
11189 && flinfo.dynsym_sec->output_section != bfd_abs_section_ptr)
11191 Elf_Internal_Sym sym;
11192 bfd_byte *dynsym = flinfo.dynsym_sec->contents;
11193 long last_local = 0;
11195 /* Write out the section symbols for the output sections. */
11196 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
11202 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11204 sym.st_target_internal = 0;
11206 for (s = abfd->sections; s != NULL; s = s->next)
11212 dynindx = elf_section_data (s)->dynindx;
11215 indx = elf_section_data (s)->this_idx;
11216 BFD_ASSERT (indx > 0);
11217 sym.st_shndx = indx;
11218 if (! check_dynsym (abfd, &sym))
11220 sym.st_value = s->vma;
11221 dest = dynsym + dynindx * bed->s->sizeof_sym;
11222 if (last_local < dynindx)
11223 last_local = dynindx;
11224 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11228 /* Write out the local dynsyms. */
11229 if (elf_hash_table (info)->dynlocal)
11231 struct elf_link_local_dynamic_entry *e;
11232 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11237 /* Copy the internal symbol and turn off visibility.
11238 Note that we saved a word of storage and overwrote
11239 the original st_name with the dynstr_index. */
11241 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11243 s = bfd_section_from_elf_index (e->input_bfd,
11248 elf_section_data (s->output_section)->this_idx;
11249 if (! check_dynsym (abfd, &sym))
11251 sym.st_value = (s->output_section->vma
11253 + e->isym.st_value);
11256 if (last_local < e->dynindx)
11257 last_local = e->dynindx;
11259 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11260 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11264 elf_section_data (flinfo.dynsym_sec->output_section)->this_hdr.sh_info =
11268 /* We get the global symbols from the hash table. */
11269 eoinfo.failed = FALSE;
11270 eoinfo.localsyms = FALSE;
11271 eoinfo.flinfo = &flinfo;
11272 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11276 /* If backend needs to output some symbols not present in the hash
11277 table, do it now. */
11278 if (bed->elf_backend_output_arch_syms
11279 && (info->strip != strip_all || emit_relocs))
11281 typedef int (*out_sym_func)
11282 (void *, const char *, Elf_Internal_Sym *, asection *,
11283 struct elf_link_hash_entry *);
11285 if (! ((*bed->elf_backend_output_arch_syms)
11286 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11290 /* Flush all symbols to the file. */
11291 if (! elf_link_flush_output_syms (&flinfo, bed))
11294 /* Now we know the size of the symtab section. */
11295 if (bfd_get_symcount (abfd) > 0)
11297 /* Finish up and write out the symbol string table (.strtab)
11299 Elf_Internal_Shdr *symstrtab_hdr;
11300 file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
11302 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
11303 if (symtab_shndx_hdr->sh_name != 0)
11305 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11306 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11307 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11308 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11309 symtab_shndx_hdr->sh_size = amt;
11311 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11314 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11315 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11319 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11320 /* sh_name was set in prep_headers. */
11321 symstrtab_hdr->sh_type = SHT_STRTAB;
11322 symstrtab_hdr->sh_flags = 0;
11323 symstrtab_hdr->sh_addr = 0;
11324 symstrtab_hdr->sh_size = _bfd_stringtab_size (flinfo.symstrtab);
11325 symstrtab_hdr->sh_entsize = 0;
11326 symstrtab_hdr->sh_link = 0;
11327 symstrtab_hdr->sh_info = 0;
11328 /* sh_offset is set just below. */
11329 symstrtab_hdr->sh_addralign = 1;
11331 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
11333 elf_next_file_pos (abfd) = off;
11335 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11336 || ! _bfd_stringtab_emit (abfd, flinfo.symstrtab))
11340 /* Adjust the relocs to have the correct symbol indices. */
11341 for (o = abfd->sections; o != NULL; o = o->next)
11343 struct bfd_elf_section_data *esdo = elf_section_data (o);
11345 if ((o->flags & SEC_RELOC) == 0)
11348 sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o);
11349 if (esdo->rel.hdr != NULL)
11350 elf_link_adjust_relocs (abfd, &esdo->rel, sort);
11351 if (esdo->rela.hdr != NULL)
11352 elf_link_adjust_relocs (abfd, &esdo->rela, sort);
11354 /* Set the reloc_count field to 0 to prevent write_relocs from
11355 trying to swap the relocs out itself. */
11356 o->reloc_count = 0;
11359 if (dynamic && info->combreloc && dynobj != NULL)
11360 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11362 /* If we are linking against a dynamic object, or generating a
11363 shared library, finish up the dynamic linking information. */
11366 bfd_byte *dyncon, *dynconend;
11368 /* Fix up .dynamic entries. */
11369 o = bfd_get_linker_section (dynobj, ".dynamic");
11370 BFD_ASSERT (o != NULL);
11372 dyncon = o->contents;
11373 dynconend = o->contents + o->size;
11374 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11376 Elf_Internal_Dyn dyn;
11380 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11387 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11389 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11391 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11392 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11395 dyn.d_un.d_val = relativecount;
11402 name = info->init_function;
11405 name = info->fini_function;
11408 struct elf_link_hash_entry *h;
11410 h = elf_link_hash_lookup (elf_hash_table (info), name,
11411 FALSE, FALSE, TRUE);
11413 && (h->root.type == bfd_link_hash_defined
11414 || h->root.type == bfd_link_hash_defweak))
11416 dyn.d_un.d_ptr = h->root.u.def.value;
11417 o = h->root.u.def.section;
11418 if (o->output_section != NULL)
11419 dyn.d_un.d_ptr += (o->output_section->vma
11420 + o->output_offset);
11423 /* The symbol is imported from another shared
11424 library and does not apply to this one. */
11425 dyn.d_un.d_ptr = 0;
11432 case DT_PREINIT_ARRAYSZ:
11433 name = ".preinit_array";
11435 case DT_INIT_ARRAYSZ:
11436 name = ".init_array";
11438 case DT_FINI_ARRAYSZ:
11439 name = ".fini_array";
11441 o = bfd_get_section_by_name (abfd, name);
11444 (*_bfd_error_handler)
11445 (_("%B: could not find output section %s"), abfd, name);
11449 (*_bfd_error_handler)
11450 (_("warning: %s section has zero size"), name);
11451 dyn.d_un.d_val = o->size;
11454 case DT_PREINIT_ARRAY:
11455 name = ".preinit_array";
11457 case DT_INIT_ARRAY:
11458 name = ".init_array";
11460 case DT_FINI_ARRAY:
11461 name = ".fini_array";
11468 name = ".gnu.hash";
11477 name = ".gnu.version_d";
11480 name = ".gnu.version_r";
11483 name = ".gnu.version";
11485 o = bfd_get_section_by_name (abfd, name);
11488 (*_bfd_error_handler)
11489 (_("%B: could not find output section %s"), abfd, name);
11492 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11494 (*_bfd_error_handler)
11495 (_("warning: section '%s' is being made into a note"), name);
11496 bfd_set_error (bfd_error_nonrepresentable_section);
11499 dyn.d_un.d_ptr = o->vma;
11506 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11510 dyn.d_un.d_val = 0;
11511 dyn.d_un.d_ptr = 0;
11512 for (i = 1; i < elf_numsections (abfd); i++)
11514 Elf_Internal_Shdr *hdr;
11516 hdr = elf_elfsections (abfd)[i];
11517 if (hdr->sh_type == type
11518 && (hdr->sh_flags & SHF_ALLOC) != 0)
11520 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11521 dyn.d_un.d_val += hdr->sh_size;
11524 if (dyn.d_un.d_ptr == 0
11525 || hdr->sh_addr < dyn.d_un.d_ptr)
11526 dyn.d_un.d_ptr = hdr->sh_addr;
11532 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11536 /* If we have created any dynamic sections, then output them. */
11537 if (dynobj != NULL)
11539 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11542 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11543 if (((info->warn_shared_textrel && info->shared)
11544 || info->error_textrel)
11545 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11547 bfd_byte *dyncon, *dynconend;
11549 dyncon = o->contents;
11550 dynconend = o->contents + o->size;
11551 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11553 Elf_Internal_Dyn dyn;
11555 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11557 if (dyn.d_tag == DT_TEXTREL)
11559 if (info->error_textrel)
11560 info->callbacks->einfo
11561 (_("%P%X: read-only segment has dynamic relocations.\n"));
11563 info->callbacks->einfo
11564 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11570 for (o = dynobj->sections; o != NULL; o = o->next)
11572 if ((o->flags & SEC_HAS_CONTENTS) == 0
11574 || o->output_section == bfd_abs_section_ptr)
11576 if ((o->flags & SEC_LINKER_CREATED) == 0)
11578 /* At this point, we are only interested in sections
11579 created by _bfd_elf_link_create_dynamic_sections. */
11582 if (elf_hash_table (info)->stab_info.stabstr == o)
11584 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11586 if (strcmp (o->name, ".dynstr") != 0)
11588 /* FIXME: octets_per_byte. */
11589 if (! bfd_set_section_contents (abfd, o->output_section,
11591 (file_ptr) o->output_offset,
11597 /* The contents of the .dynstr section are actually in a
11601 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11602 if (bfd_seek (abfd, off, SEEK_SET) != 0
11603 || ! _bfd_elf_strtab_emit (abfd,
11604 elf_hash_table (info)->dynstr))
11610 if (info->relocatable)
11612 bfd_boolean failed = FALSE;
11614 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11619 /* If we have optimized stabs strings, output them. */
11620 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11622 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11626 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11629 elf_final_link_free (abfd, &flinfo);
11631 elf_linker (abfd) = TRUE;
11635 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11636 if (contents == NULL)
11637 return FALSE; /* Bail out and fail. */
11638 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11639 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11646 elf_final_link_free (abfd, &flinfo);
11650 /* Initialize COOKIE for input bfd ABFD. */
11653 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11654 struct bfd_link_info *info, bfd *abfd)
11656 Elf_Internal_Shdr *symtab_hdr;
11657 const struct elf_backend_data *bed;
11659 bed = get_elf_backend_data (abfd);
11660 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11662 cookie->abfd = abfd;
11663 cookie->sym_hashes = elf_sym_hashes (abfd);
11664 cookie->bad_symtab = elf_bad_symtab (abfd);
11665 if (cookie->bad_symtab)
11667 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11668 cookie->extsymoff = 0;
11672 cookie->locsymcount = symtab_hdr->sh_info;
11673 cookie->extsymoff = symtab_hdr->sh_info;
11676 if (bed->s->arch_size == 32)
11677 cookie->r_sym_shift = 8;
11679 cookie->r_sym_shift = 32;
11681 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11682 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11684 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11685 cookie->locsymcount, 0,
11687 if (cookie->locsyms == NULL)
11689 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11692 if (info->keep_memory)
11693 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11698 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11701 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11703 Elf_Internal_Shdr *symtab_hdr;
11705 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11706 if (cookie->locsyms != NULL
11707 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11708 free (cookie->locsyms);
11711 /* Initialize the relocation information in COOKIE for input section SEC
11712 of input bfd ABFD. */
11715 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11716 struct bfd_link_info *info, bfd *abfd,
11719 const struct elf_backend_data *bed;
11721 if (sec->reloc_count == 0)
11723 cookie->rels = NULL;
11724 cookie->relend = NULL;
11728 bed = get_elf_backend_data (abfd);
11730 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11731 info->keep_memory);
11732 if (cookie->rels == NULL)
11734 cookie->rel = cookie->rels;
11735 cookie->relend = (cookie->rels
11736 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11738 cookie->rel = cookie->rels;
11742 /* Free the memory allocated by init_reloc_cookie_rels,
11746 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11749 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11750 free (cookie->rels);
11753 /* Initialize the whole of COOKIE for input section SEC. */
11756 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11757 struct bfd_link_info *info,
11760 if (!init_reloc_cookie (cookie, info, sec->owner))
11762 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11767 fini_reloc_cookie (cookie, sec->owner);
11772 /* Free the memory allocated by init_reloc_cookie_for_section,
11776 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11779 fini_reloc_cookie_rels (cookie, sec);
11780 fini_reloc_cookie (cookie, sec->owner);
11783 /* Garbage collect unused sections. */
11785 /* Default gc_mark_hook. */
11788 _bfd_elf_gc_mark_hook (asection *sec,
11789 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11790 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11791 struct elf_link_hash_entry *h,
11792 Elf_Internal_Sym *sym)
11794 const char *sec_name;
11798 switch (h->root.type)
11800 case bfd_link_hash_defined:
11801 case bfd_link_hash_defweak:
11802 return h->root.u.def.section;
11804 case bfd_link_hash_common:
11805 return h->root.u.c.p->section;
11807 case bfd_link_hash_undefined:
11808 case bfd_link_hash_undefweak:
11809 /* To work around a glibc bug, keep all XXX input sections
11810 when there is an as yet undefined reference to __start_XXX
11811 or __stop_XXX symbols. The linker will later define such
11812 symbols for orphan input sections that have a name
11813 representable as a C identifier. */
11814 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11815 sec_name = h->root.root.string + 8;
11816 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11817 sec_name = h->root.root.string + 7;
11821 if (sec_name && *sec_name != '\0')
11825 for (i = info->input_bfds; i; i = i->link.next)
11827 sec = bfd_get_section_by_name (i, sec_name);
11829 sec->flags |= SEC_KEEP;
11839 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11844 /* COOKIE->rel describes a relocation against section SEC, which is
11845 a section we've decided to keep. Return the section that contains
11846 the relocation symbol, or NULL if no section contains it. */
11849 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11850 elf_gc_mark_hook_fn gc_mark_hook,
11851 struct elf_reloc_cookie *cookie)
11853 unsigned long r_symndx;
11854 struct elf_link_hash_entry *h;
11856 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11857 if (r_symndx == STN_UNDEF)
11860 if (r_symndx >= cookie->locsymcount
11861 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11863 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11866 info->callbacks->einfo (_("%F%P: corrupt input: %B\n"),
11870 while (h->root.type == bfd_link_hash_indirect
11871 || h->root.type == bfd_link_hash_warning)
11872 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11874 /* If this symbol is weak and there is a non-weak definition, we
11875 keep the non-weak definition because many backends put
11876 dynamic reloc info on the non-weak definition for code
11877 handling copy relocs. */
11878 if (h->u.weakdef != NULL)
11879 h->u.weakdef->mark = 1;
11880 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11883 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11884 &cookie->locsyms[r_symndx]);
11887 /* COOKIE->rel describes a relocation against section SEC, which is
11888 a section we've decided to keep. Mark the section that contains
11889 the relocation symbol. */
11892 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11894 elf_gc_mark_hook_fn gc_mark_hook,
11895 struct elf_reloc_cookie *cookie)
11899 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11900 if (rsec && !rsec->gc_mark)
11902 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
11903 || (rsec->owner->flags & DYNAMIC) != 0)
11905 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11911 /* The mark phase of garbage collection. For a given section, mark
11912 it and any sections in this section's group, and all the sections
11913 which define symbols to which it refers. */
11916 _bfd_elf_gc_mark (struct bfd_link_info *info,
11918 elf_gc_mark_hook_fn gc_mark_hook)
11921 asection *group_sec, *eh_frame;
11925 /* Mark all the sections in the group. */
11926 group_sec = elf_section_data (sec)->next_in_group;
11927 if (group_sec && !group_sec->gc_mark)
11928 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11931 /* Look through the section relocs. */
11933 eh_frame = elf_eh_frame_section (sec->owner);
11934 if ((sec->flags & SEC_RELOC) != 0
11935 && sec->reloc_count > 0
11936 && sec != eh_frame)
11938 struct elf_reloc_cookie cookie;
11940 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11944 for (; cookie.rel < cookie.relend; cookie.rel++)
11945 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11950 fini_reloc_cookie_for_section (&cookie, sec);
11954 if (ret && eh_frame && elf_fde_list (sec))
11956 struct elf_reloc_cookie cookie;
11958 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11962 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11963 gc_mark_hook, &cookie))
11965 fini_reloc_cookie_for_section (&cookie, eh_frame);
11972 /* Scan and mark sections in a special or debug section group. */
11975 _bfd_elf_gc_mark_debug_special_section_group (asection *grp)
11977 /* Point to first section of section group. */
11979 /* Used to iterate the section group. */
11982 bfd_boolean is_special_grp = TRUE;
11983 bfd_boolean is_debug_grp = TRUE;
11985 /* First scan to see if group contains any section other than debug
11986 and special section. */
11987 ssec = msec = elf_next_in_group (grp);
11990 if ((msec->flags & SEC_DEBUGGING) == 0)
11991 is_debug_grp = FALSE;
11993 if ((msec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) != 0)
11994 is_special_grp = FALSE;
11996 msec = elf_next_in_group (msec);
11998 while (msec != ssec);
12000 /* If this is a pure debug section group or pure special section group,
12001 keep all sections in this group. */
12002 if (is_debug_grp || is_special_grp)
12007 msec = elf_next_in_group (msec);
12009 while (msec != ssec);
12013 /* Keep debug and special sections. */
12016 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
12017 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
12021 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12024 bfd_boolean some_kept;
12025 bfd_boolean debug_frag_seen;
12027 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12030 /* Ensure all linker created sections are kept,
12031 see if any other section is already marked,
12032 and note if we have any fragmented debug sections. */
12033 debug_frag_seen = some_kept = FALSE;
12034 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12036 if ((isec->flags & SEC_LINKER_CREATED) != 0)
12038 else if (isec->gc_mark)
12041 if (debug_frag_seen == FALSE
12042 && (isec->flags & SEC_DEBUGGING)
12043 && CONST_STRNEQ (isec->name, ".debug_line."))
12044 debug_frag_seen = TRUE;
12047 /* If no section in this file will be kept, then we can
12048 toss out the debug and special sections. */
12052 /* Keep debug and special sections like .comment when they are
12053 not part of a group. Also keep section groups that contain
12054 just debug sections or special sections. */
12055 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12057 if ((isec->flags & SEC_GROUP) != 0)
12058 _bfd_elf_gc_mark_debug_special_section_group (isec);
12059 else if (((isec->flags & SEC_DEBUGGING) != 0
12060 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
12061 && elf_next_in_group (isec) == NULL)
12065 if (! debug_frag_seen)
12068 /* Look for CODE sections which are going to be discarded,
12069 and find and discard any fragmented debug sections which
12070 are associated with that code section. */
12071 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12072 if ((isec->flags & SEC_CODE) != 0
12073 && isec->gc_mark == 0)
12078 ilen = strlen (isec->name);
12080 /* Association is determined by the name of the debug section
12081 containing the name of the code section as a suffix. For
12082 example .debug_line.text.foo is a debug section associated
12084 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
12088 if (dsec->gc_mark == 0
12089 || (dsec->flags & SEC_DEBUGGING) == 0)
12092 dlen = strlen (dsec->name);
12095 && strncmp (dsec->name + (dlen - ilen),
12096 isec->name, ilen) == 0)
12107 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
12109 struct elf_gc_sweep_symbol_info
12111 struct bfd_link_info *info;
12112 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
12117 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
12120 && (((h->root.type == bfd_link_hash_defined
12121 || h->root.type == bfd_link_hash_defweak)
12122 && !((h->def_regular || ELF_COMMON_DEF_P (h))
12123 && h->root.u.def.section->gc_mark))
12124 || h->root.type == bfd_link_hash_undefined
12125 || h->root.type == bfd_link_hash_undefweak))
12127 struct elf_gc_sweep_symbol_info *inf;
12129 inf = (struct elf_gc_sweep_symbol_info *) data;
12130 (*inf->hide_symbol) (inf->info, h, TRUE);
12131 h->def_regular = 0;
12132 h->ref_regular = 0;
12133 h->ref_regular_nonweak = 0;
12139 /* The sweep phase of garbage collection. Remove all garbage sections. */
12141 typedef bfd_boolean (*gc_sweep_hook_fn)
12142 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
12145 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
12148 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12149 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
12150 unsigned long section_sym_count;
12151 struct elf_gc_sweep_symbol_info sweep_info;
12153 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12157 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12160 for (o = sub->sections; o != NULL; o = o->next)
12162 /* When any section in a section group is kept, we keep all
12163 sections in the section group. If the first member of
12164 the section group is excluded, we will also exclude the
12166 if (o->flags & SEC_GROUP)
12168 asection *first = elf_next_in_group (o);
12169 o->gc_mark = first->gc_mark;
12175 /* Skip sweeping sections already excluded. */
12176 if (o->flags & SEC_EXCLUDE)
12179 /* Since this is early in the link process, it is simple
12180 to remove a section from the output. */
12181 o->flags |= SEC_EXCLUDE;
12183 if (info->print_gc_sections && o->size != 0)
12184 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
12186 /* But we also have to update some of the relocation
12187 info we collected before. */
12189 && (o->flags & SEC_RELOC) != 0
12190 && o->reloc_count != 0
12191 && !((info->strip == strip_all || info->strip == strip_debugger)
12192 && (o->flags & SEC_DEBUGGING) != 0)
12193 && !bfd_is_abs_section (o->output_section))
12195 Elf_Internal_Rela *internal_relocs;
12199 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
12200 info->keep_memory);
12201 if (internal_relocs == NULL)
12204 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
12206 if (elf_section_data (o)->relocs != internal_relocs)
12207 free (internal_relocs);
12215 /* Remove the symbols that were in the swept sections from the dynamic
12216 symbol table. GCFIXME: Anyone know how to get them out of the
12217 static symbol table as well? */
12218 sweep_info.info = info;
12219 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
12220 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
12223 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
12227 /* Propagate collected vtable information. This is called through
12228 elf_link_hash_traverse. */
12231 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
12233 /* Those that are not vtables. */
12234 if (h->vtable == NULL || h->vtable->parent == NULL)
12237 /* Those vtables that do not have parents, we cannot merge. */
12238 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12241 /* If we've already been done, exit. */
12242 if (h->vtable->used && h->vtable->used[-1])
12245 /* Make sure the parent's table is up to date. */
12246 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12248 if (h->vtable->used == NULL)
12250 /* None of this table's entries were referenced. Re-use the
12252 h->vtable->used = h->vtable->parent->vtable->used;
12253 h->vtable->size = h->vtable->parent->vtable->size;
12258 bfd_boolean *cu, *pu;
12260 /* Or the parent's entries into ours. */
12261 cu = h->vtable->used;
12263 pu = h->vtable->parent->vtable->used;
12266 const struct elf_backend_data *bed;
12267 unsigned int log_file_align;
12269 bed = get_elf_backend_data (h->root.u.def.section->owner);
12270 log_file_align = bed->s->log_file_align;
12271 n = h->vtable->parent->vtable->size >> log_file_align;
12286 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12289 bfd_vma hstart, hend;
12290 Elf_Internal_Rela *relstart, *relend, *rel;
12291 const struct elf_backend_data *bed;
12292 unsigned int log_file_align;
12294 /* Take care of both those symbols that do not describe vtables as
12295 well as those that are not loaded. */
12296 if (h->vtable == NULL || h->vtable->parent == NULL)
12299 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12300 || h->root.type == bfd_link_hash_defweak);
12302 sec = h->root.u.def.section;
12303 hstart = h->root.u.def.value;
12304 hend = hstart + h->size;
12306 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12308 return *(bfd_boolean *) okp = FALSE;
12309 bed = get_elf_backend_data (sec->owner);
12310 log_file_align = bed->s->log_file_align;
12312 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12314 for (rel = relstart; rel < relend; ++rel)
12315 if (rel->r_offset >= hstart && rel->r_offset < hend)
12317 /* If the entry is in use, do nothing. */
12318 if (h->vtable->used
12319 && (rel->r_offset - hstart) < h->vtable->size)
12321 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12322 if (h->vtable->used[entry])
12325 /* Otherwise, kill it. */
12326 rel->r_offset = rel->r_info = rel->r_addend = 0;
12332 /* Mark sections containing dynamically referenced symbols. When
12333 building shared libraries, we must assume that any visible symbol is
12337 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12339 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12340 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12342 if ((h->root.type == bfd_link_hash_defined
12343 || h->root.type == bfd_link_hash_defweak)
12345 || ((h->def_regular || ELF_COMMON_DEF_P (h))
12346 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12347 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12348 && (!info->executable
12349 || info->export_dynamic
12352 && (*d->match) (&d->head, NULL, h->root.root.string)))
12353 && (strchr (h->root.root.string, ELF_VER_CHR) != NULL
12354 || !bfd_hide_sym_by_version (info->version_info,
12355 h->root.root.string)))))
12356 h->root.u.def.section->flags |= SEC_KEEP;
12361 /* Keep all sections containing symbols undefined on the command-line,
12362 and the section containing the entry symbol. */
12365 _bfd_elf_gc_keep (struct bfd_link_info *info)
12367 struct bfd_sym_chain *sym;
12369 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12371 struct elf_link_hash_entry *h;
12373 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12374 FALSE, FALSE, FALSE);
12377 && (h->root.type == bfd_link_hash_defined
12378 || h->root.type == bfd_link_hash_defweak)
12379 && !bfd_is_abs_section (h->root.u.def.section))
12380 h->root.u.def.section->flags |= SEC_KEEP;
12384 /* Do mark and sweep of unused sections. */
12387 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12389 bfd_boolean ok = TRUE;
12391 elf_gc_mark_hook_fn gc_mark_hook;
12392 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12393 struct elf_link_hash_table *htab;
12395 if (!bed->can_gc_sections
12396 || !is_elf_hash_table (info->hash))
12398 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12402 bed->gc_keep (info);
12403 htab = elf_hash_table (info);
12405 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12406 at the .eh_frame section if we can mark the FDEs individually. */
12407 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12410 struct elf_reloc_cookie cookie;
12412 sec = bfd_get_section_by_name (sub, ".eh_frame");
12413 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12415 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12416 if (elf_section_data (sec)->sec_info
12417 && (sec->flags & SEC_LINKER_CREATED) == 0)
12418 elf_eh_frame_section (sub) = sec;
12419 fini_reloc_cookie_for_section (&cookie, sec);
12420 sec = bfd_get_next_section_by_name (sec);
12424 /* Apply transitive closure to the vtable entry usage info. */
12425 elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
12429 /* Kill the vtable relocations that were not used. */
12430 elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
12434 /* Mark dynamically referenced symbols. */
12435 if (htab->dynamic_sections_created)
12436 elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
12438 /* Grovel through relocs to find out who stays ... */
12439 gc_mark_hook = bed->gc_mark_hook;
12440 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12444 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12447 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12448 Also treat note sections as a root, if the section is not part
12450 for (o = sub->sections; o != NULL; o = o->next)
12452 && (o->flags & SEC_EXCLUDE) == 0
12453 && ((o->flags & SEC_KEEP) != 0
12454 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12455 && elf_next_in_group (o) == NULL )))
12457 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12462 /* Allow the backend to mark additional target specific sections. */
12463 bed->gc_mark_extra_sections (info, gc_mark_hook);
12465 /* ... and mark SEC_EXCLUDE for those that go. */
12466 return elf_gc_sweep (abfd, info);
12469 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12472 bfd_elf_gc_record_vtinherit (bfd *abfd,
12474 struct elf_link_hash_entry *h,
12477 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12478 struct elf_link_hash_entry **search, *child;
12479 bfd_size_type extsymcount;
12480 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12482 /* The sh_info field of the symtab header tells us where the
12483 external symbols start. We don't care about the local symbols at
12485 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12486 if (!elf_bad_symtab (abfd))
12487 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12489 sym_hashes = elf_sym_hashes (abfd);
12490 sym_hashes_end = sym_hashes + extsymcount;
12492 /* Hunt down the child symbol, which is in this section at the same
12493 offset as the relocation. */
12494 for (search = sym_hashes; search != sym_hashes_end; ++search)
12496 if ((child = *search) != NULL
12497 && (child->root.type == bfd_link_hash_defined
12498 || child->root.type == bfd_link_hash_defweak)
12499 && child->root.u.def.section == sec
12500 && child->root.u.def.value == offset)
12504 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12505 abfd, sec, (unsigned long) offset);
12506 bfd_set_error (bfd_error_invalid_operation);
12510 if (!child->vtable)
12512 child->vtable = ((struct elf_link_virtual_table_entry *)
12513 bfd_zalloc (abfd, sizeof (*child->vtable)));
12514 if (!child->vtable)
12519 /* This *should* only be the absolute section. It could potentially
12520 be that someone has defined a non-global vtable though, which
12521 would be bad. It isn't worth paging in the local symbols to be
12522 sure though; that case should simply be handled by the assembler. */
12524 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12527 child->vtable->parent = h;
12532 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12535 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12536 asection *sec ATTRIBUTE_UNUSED,
12537 struct elf_link_hash_entry *h,
12540 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12541 unsigned int log_file_align = bed->s->log_file_align;
12545 h->vtable = ((struct elf_link_virtual_table_entry *)
12546 bfd_zalloc (abfd, sizeof (*h->vtable)));
12551 if (addend >= h->vtable->size)
12553 size_t size, bytes, file_align;
12554 bfd_boolean *ptr = h->vtable->used;
12556 /* While the symbol is undefined, we have to be prepared to handle
12558 file_align = 1 << log_file_align;
12559 if (h->root.type == bfd_link_hash_undefined)
12560 size = addend + file_align;
12564 if (addend >= size)
12566 /* Oops! We've got a reference past the defined end of
12567 the table. This is probably a bug -- shall we warn? */
12568 size = addend + file_align;
12571 size = (size + file_align - 1) & -file_align;
12573 /* Allocate one extra entry for use as a "done" flag for the
12574 consolidation pass. */
12575 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12579 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12585 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12586 * sizeof (bfd_boolean));
12587 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12591 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12596 /* And arrange for that done flag to be at index -1. */
12597 h->vtable->used = ptr + 1;
12598 h->vtable->size = size;
12601 h->vtable->used[addend >> log_file_align] = TRUE;
12606 /* Map an ELF section header flag to its corresponding string. */
12610 flagword flag_value;
12611 } elf_flags_to_name_table;
12613 static elf_flags_to_name_table elf_flags_to_names [] =
12615 { "SHF_WRITE", SHF_WRITE },
12616 { "SHF_ALLOC", SHF_ALLOC },
12617 { "SHF_EXECINSTR", SHF_EXECINSTR },
12618 { "SHF_MERGE", SHF_MERGE },
12619 { "SHF_STRINGS", SHF_STRINGS },
12620 { "SHF_INFO_LINK", SHF_INFO_LINK},
12621 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
12622 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
12623 { "SHF_GROUP", SHF_GROUP },
12624 { "SHF_TLS", SHF_TLS },
12625 { "SHF_MASKOS", SHF_MASKOS },
12626 { "SHF_EXCLUDE", SHF_EXCLUDE },
12629 /* Returns TRUE if the section is to be included, otherwise FALSE. */
12631 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
12632 struct flag_info *flaginfo,
12635 const bfd_vma sh_flags = elf_section_flags (section);
12637 if (!flaginfo->flags_initialized)
12639 bfd *obfd = info->output_bfd;
12640 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12641 struct flag_info_list *tf = flaginfo->flag_list;
12643 int without_hex = 0;
12645 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
12648 flagword (*lookup) (char *);
12650 lookup = bed->elf_backend_lookup_section_flags_hook;
12651 if (lookup != NULL)
12653 flagword hexval = (*lookup) ((char *) tf->name);
12657 if (tf->with == with_flags)
12658 with_hex |= hexval;
12659 else if (tf->with == without_flags)
12660 without_hex |= hexval;
12665 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
12667 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
12669 if (tf->with == with_flags)
12670 with_hex |= elf_flags_to_names[i].flag_value;
12671 else if (tf->with == without_flags)
12672 without_hex |= elf_flags_to_names[i].flag_value;
12679 info->callbacks->einfo
12680 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
12684 flaginfo->flags_initialized = TRUE;
12685 flaginfo->only_with_flags |= with_hex;
12686 flaginfo->not_with_flags |= without_hex;
12689 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
12692 if ((flaginfo->not_with_flags & sh_flags) != 0)
12698 struct alloc_got_off_arg {
12700 struct bfd_link_info *info;
12703 /* We need a special top-level link routine to convert got reference counts
12704 to real got offsets. */
12707 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12709 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12710 bfd *obfd = gofarg->info->output_bfd;
12711 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12713 if (h->got.refcount > 0)
12715 h->got.offset = gofarg->gotoff;
12716 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12719 h->got.offset = (bfd_vma) -1;
12724 /* And an accompanying bit to work out final got entry offsets once
12725 we're done. Should be called from final_link. */
12728 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12729 struct bfd_link_info *info)
12732 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12734 struct alloc_got_off_arg gofarg;
12736 BFD_ASSERT (abfd == info->output_bfd);
12738 if (! is_elf_hash_table (info->hash))
12741 /* The GOT offset is relative to the .got section, but the GOT header is
12742 put into the .got.plt section, if the backend uses it. */
12743 if (bed->want_got_plt)
12746 gotoff = bed->got_header_size;
12748 /* Do the local .got entries first. */
12749 for (i = info->input_bfds; i; i = i->link.next)
12751 bfd_signed_vma *local_got;
12752 bfd_size_type j, locsymcount;
12753 Elf_Internal_Shdr *symtab_hdr;
12755 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12758 local_got = elf_local_got_refcounts (i);
12762 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12763 if (elf_bad_symtab (i))
12764 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12766 locsymcount = symtab_hdr->sh_info;
12768 for (j = 0; j < locsymcount; ++j)
12770 if (local_got[j] > 0)
12772 local_got[j] = gotoff;
12773 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12776 local_got[j] = (bfd_vma) -1;
12780 /* Then the global .got entries. .plt refcounts are handled by
12781 adjust_dynamic_symbol */
12782 gofarg.gotoff = gotoff;
12783 gofarg.info = info;
12784 elf_link_hash_traverse (elf_hash_table (info),
12785 elf_gc_allocate_got_offsets,
12790 /* Many folk need no more in the way of final link than this, once
12791 got entry reference counting is enabled. */
12794 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12796 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12799 /* Invoke the regular ELF backend linker to do all the work. */
12800 return bfd_elf_final_link (abfd, info);
12804 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12806 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12808 if (rcookie->bad_symtab)
12809 rcookie->rel = rcookie->rels;
12811 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12813 unsigned long r_symndx;
12815 if (! rcookie->bad_symtab)
12816 if (rcookie->rel->r_offset > offset)
12818 if (rcookie->rel->r_offset != offset)
12821 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12822 if (r_symndx == STN_UNDEF)
12825 if (r_symndx >= rcookie->locsymcount
12826 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12828 struct elf_link_hash_entry *h;
12830 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12832 while (h->root.type == bfd_link_hash_indirect
12833 || h->root.type == bfd_link_hash_warning)
12834 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12836 if ((h->root.type == bfd_link_hash_defined
12837 || h->root.type == bfd_link_hash_defweak)
12838 && (h->root.u.def.section->owner != rcookie->abfd
12839 || h->root.u.def.section->kept_section != NULL
12840 || discarded_section (h->root.u.def.section)))
12845 /* It's not a relocation against a global symbol,
12846 but it could be a relocation against a local
12847 symbol for a discarded section. */
12849 Elf_Internal_Sym *isym;
12851 /* Need to: get the symbol; get the section. */
12852 isym = &rcookie->locsyms[r_symndx];
12853 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12855 && (isec->kept_section != NULL
12856 || discarded_section (isec)))
12864 /* Discard unneeded references to discarded sections.
12865 Returns -1 on error, 1 if any section's size was changed, 0 if
12866 nothing changed. This function assumes that the relocations are in
12867 sorted order, which is true for all known assemblers. */
12870 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12872 struct elf_reloc_cookie cookie;
12877 if (info->traditional_format
12878 || !is_elf_hash_table (info->hash))
12881 o = bfd_get_section_by_name (output_bfd, ".stab");
12886 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12889 || i->reloc_count == 0
12890 || i->sec_info_type != SEC_INFO_TYPE_STABS)
12894 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12897 if (!init_reloc_cookie_for_section (&cookie, info, i))
12900 if (_bfd_discard_section_stabs (abfd, i,
12901 elf_section_data (i)->sec_info,
12902 bfd_elf_reloc_symbol_deleted_p,
12906 fini_reloc_cookie_for_section (&cookie, i);
12910 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
12915 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12921 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12924 if (!init_reloc_cookie_for_section (&cookie, info, i))
12927 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
12928 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
12929 bfd_elf_reloc_symbol_deleted_p,
12933 fini_reloc_cookie_for_section (&cookie, i);
12937 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
12939 const struct elf_backend_data *bed;
12941 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12944 bed = get_elf_backend_data (abfd);
12946 if (bed->elf_backend_discard_info != NULL)
12948 if (!init_reloc_cookie (&cookie, info, abfd))
12951 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
12954 fini_reloc_cookie (&cookie, abfd);
12958 if (info->eh_frame_hdr
12959 && !info->relocatable
12960 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12967 _bfd_elf_section_already_linked (bfd *abfd,
12969 struct bfd_link_info *info)
12972 const char *name, *key;
12973 struct bfd_section_already_linked *l;
12974 struct bfd_section_already_linked_hash_entry *already_linked_list;
12976 if (sec->output_section == bfd_abs_section_ptr)
12979 flags = sec->flags;
12981 /* Return if it isn't a linkonce section. A comdat group section
12982 also has SEC_LINK_ONCE set. */
12983 if ((flags & SEC_LINK_ONCE) == 0)
12986 /* Don't put group member sections on our list of already linked
12987 sections. They are handled as a group via their group section. */
12988 if (elf_sec_group (sec) != NULL)
12991 /* For a SHT_GROUP section, use the group signature as the key. */
12993 if ((flags & SEC_GROUP) != 0
12994 && elf_next_in_group (sec) != NULL
12995 && elf_group_name (elf_next_in_group (sec)) != NULL)
12996 key = elf_group_name (elf_next_in_group (sec));
12999 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
13000 if (CONST_STRNEQ (name, ".gnu.linkonce.")
13001 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
13004 /* Must be a user linkonce section that doesn't follow gcc's
13005 naming convention. In this case we won't be matching
13006 single member groups. */
13010 already_linked_list = bfd_section_already_linked_table_lookup (key);
13012 for (l = already_linked_list->entry; l != NULL; l = l->next)
13014 /* We may have 2 different types of sections on the list: group
13015 sections with a signature of <key> (<key> is some string),
13016 and linkonce sections named .gnu.linkonce.<type>.<key>.
13017 Match like sections. LTO plugin sections are an exception.
13018 They are always named .gnu.linkonce.t.<key> and match either
13019 type of section. */
13020 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
13021 && ((flags & SEC_GROUP) != 0
13022 || strcmp (name, l->sec->name) == 0))
13023 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
13025 /* The section has already been linked. See if we should
13026 issue a warning. */
13027 if (!_bfd_handle_already_linked (sec, l, info))
13030 if (flags & SEC_GROUP)
13032 asection *first = elf_next_in_group (sec);
13033 asection *s = first;
13037 s->output_section = bfd_abs_section_ptr;
13038 /* Record which group discards it. */
13039 s->kept_section = l->sec;
13040 s = elf_next_in_group (s);
13041 /* These lists are circular. */
13051 /* A single member comdat group section may be discarded by a
13052 linkonce section and vice versa. */
13053 if ((flags & SEC_GROUP) != 0)
13055 asection *first = elf_next_in_group (sec);
13057 if (first != NULL && elf_next_in_group (first) == first)
13058 /* Check this single member group against linkonce sections. */
13059 for (l = already_linked_list->entry; l != NULL; l = l->next)
13060 if ((l->sec->flags & SEC_GROUP) == 0
13061 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
13063 first->output_section = bfd_abs_section_ptr;
13064 first->kept_section = l->sec;
13065 sec->output_section = bfd_abs_section_ptr;
13070 /* Check this linkonce section against single member groups. */
13071 for (l = already_linked_list->entry; l != NULL; l = l->next)
13072 if (l->sec->flags & SEC_GROUP)
13074 asection *first = elf_next_in_group (l->sec);
13077 && elf_next_in_group (first) == first
13078 && bfd_elf_match_symbols_in_sections (first, sec, info))
13080 sec->output_section = bfd_abs_section_ptr;
13081 sec->kept_section = first;
13086 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
13087 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
13088 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
13089 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
13090 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
13091 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
13092 `.gnu.linkonce.t.F' section from a different bfd not requiring any
13093 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
13094 The reverse order cannot happen as there is never a bfd with only the
13095 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
13096 matter as here were are looking only for cross-bfd sections. */
13098 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
13099 for (l = already_linked_list->entry; l != NULL; l = l->next)
13100 if ((l->sec->flags & SEC_GROUP) == 0
13101 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
13103 if (abfd != l->sec->owner)
13104 sec->output_section = bfd_abs_section_ptr;
13108 /* This is the first section with this name. Record it. */
13109 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
13110 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
13111 return sec->output_section == bfd_abs_section_ptr;
13115 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
13117 return sym->st_shndx == SHN_COMMON;
13121 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
13127 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
13129 return bfd_com_section_ptr;
13133 _bfd_elf_default_got_elt_size (bfd *abfd,
13134 struct bfd_link_info *info ATTRIBUTE_UNUSED,
13135 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
13136 bfd *ibfd ATTRIBUTE_UNUSED,
13137 unsigned long symndx ATTRIBUTE_UNUSED)
13139 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13140 return bed->s->arch_size / 8;
13143 /* Routines to support the creation of dynamic relocs. */
13145 /* Returns the name of the dynamic reloc section associated with SEC. */
13147 static const char *
13148 get_dynamic_reloc_section_name (bfd * abfd,
13150 bfd_boolean is_rela)
13153 const char *old_name = bfd_get_section_name (NULL, sec);
13154 const char *prefix = is_rela ? ".rela" : ".rel";
13156 if (old_name == NULL)
13159 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
13160 sprintf (name, "%s%s", prefix, old_name);
13165 /* Returns the dynamic reloc section associated with SEC.
13166 If necessary compute the name of the dynamic reloc section based
13167 on SEC's name (looked up in ABFD's string table) and the setting
13171 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
13173 bfd_boolean is_rela)
13175 asection * reloc_sec = elf_section_data (sec)->sreloc;
13177 if (reloc_sec == NULL)
13179 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13183 reloc_sec = bfd_get_linker_section (abfd, name);
13185 if (reloc_sec != NULL)
13186 elf_section_data (sec)->sreloc = reloc_sec;
13193 /* Returns the dynamic reloc section associated with SEC. If the
13194 section does not exist it is created and attached to the DYNOBJ
13195 bfd and stored in the SRELOC field of SEC's elf_section_data
13198 ALIGNMENT is the alignment for the newly created section and
13199 IS_RELA defines whether the name should be .rela.<SEC's name>
13200 or .rel.<SEC's name>. The section name is looked up in the
13201 string table associated with ABFD. */
13204 _bfd_elf_make_dynamic_reloc_section (asection *sec,
13206 unsigned int alignment,
13208 bfd_boolean is_rela)
13210 asection * reloc_sec = elf_section_data (sec)->sreloc;
13212 if (reloc_sec == NULL)
13214 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13219 reloc_sec = bfd_get_linker_section (dynobj, name);
13221 if (reloc_sec == NULL)
13223 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
13224 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
13225 if ((sec->flags & SEC_ALLOC) != 0)
13226 flags |= SEC_ALLOC | SEC_LOAD;
13228 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13229 if (reloc_sec != NULL)
13231 /* _bfd_elf_get_sec_type_attr chooses a section type by
13232 name. Override as it may be wrong, eg. for a user
13233 section named "auto" we'll get ".relauto" which is
13234 seen to be a .rela section. */
13235 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13236 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13241 elf_section_data (sec)->sreloc = reloc_sec;
13247 /* Copy the ELF symbol type and other attributes for a linker script
13248 assignment from HSRC to HDEST. Generally this should be treated as
13249 if we found a strong non-dynamic definition for HDEST (except that
13250 ld ignores multiple definition errors). */
13252 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13253 struct bfd_link_hash_entry *hdest,
13254 struct bfd_link_hash_entry *hsrc)
13256 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13257 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13258 Elf_Internal_Sym isym;
13260 ehdest->type = ehsrc->type;
13261 ehdest->target_internal = ehsrc->target_internal;
13263 isym.st_other = ehsrc->other;
13264 elf_merge_st_other (abfd, ehdest, &isym, TRUE, FALSE);
13267 /* Append a RELA relocation REL to section S in BFD. */
13270 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13272 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13273 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13274 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13275 bed->s->swap_reloca_out (abfd, rel, loc);
13278 /* Append a REL relocation REL to section S in BFD. */
13281 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13283 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13284 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13285 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13286 bed->s->swap_reloc_out (abfd, rel, loc);