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, asection *sec,
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));
869 && ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT
870 && (sec->flags & SEC_READONLY) == 0)
871 h->protected_def = 1;
874 /* This function is called when we want to merge a new symbol with an
875 existing symbol. It handles the various cases which arise when we
876 find a definition in a dynamic object, or when there is already a
877 definition in a dynamic object. The new symbol is described by
878 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
879 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
880 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
881 of an old common symbol. We set OVERRIDE if the old symbol is
882 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
883 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
884 to change. By OK to change, we mean that we shouldn't warn if the
885 type or size does change. */
888 _bfd_elf_merge_symbol (bfd *abfd,
889 struct bfd_link_info *info,
891 Elf_Internal_Sym *sym,
894 struct elf_link_hash_entry **sym_hash,
896 bfd_boolean *pold_weak,
897 unsigned int *pold_alignment,
899 bfd_boolean *override,
900 bfd_boolean *type_change_ok,
901 bfd_boolean *size_change_ok)
903 asection *sec, *oldsec;
904 struct elf_link_hash_entry *h;
905 struct elf_link_hash_entry *hi;
906 struct elf_link_hash_entry *flip;
909 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
910 bfd_boolean newweak, oldweak, newfunc, oldfunc;
911 const struct elf_backend_data *bed;
917 bind = ELF_ST_BIND (sym->st_info);
919 if (! bfd_is_und_section (sec))
920 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
922 h = ((struct elf_link_hash_entry *)
923 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
928 bed = get_elf_backend_data (abfd);
930 /* For merging, we only care about real symbols. But we need to make
931 sure that indirect symbol dynamic flags are updated. */
933 while (h->root.type == bfd_link_hash_indirect
934 || h->root.type == bfd_link_hash_warning)
935 h = (struct elf_link_hash_entry *) h->root.u.i.link;
937 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
942 switch (h->root.type)
947 case bfd_link_hash_undefined:
948 case bfd_link_hash_undefweak:
949 oldbfd = h->root.u.undef.abfd;
952 case bfd_link_hash_defined:
953 case bfd_link_hash_defweak:
954 oldbfd = h->root.u.def.section->owner;
955 oldsec = h->root.u.def.section;
958 case bfd_link_hash_common:
959 oldbfd = h->root.u.c.p->section->owner;
960 oldsec = h->root.u.c.p->section;
962 *pold_alignment = h->root.u.c.p->alignment_power;
965 if (poldbfd && *poldbfd == NULL)
968 /* Differentiate strong and weak symbols. */
969 newweak = bind == STB_WEAK;
970 oldweak = (h->root.type == bfd_link_hash_defweak
971 || h->root.type == bfd_link_hash_undefweak);
973 *pold_weak = oldweak;
975 /* This code is for coping with dynamic objects, and is only useful
976 if we are doing an ELF link. */
977 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
980 /* We have to check it for every instance since the first few may be
981 references and not all compilers emit symbol type for undefined
983 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
985 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
986 respectively, is from a dynamic object. */
988 newdyn = (abfd->flags & DYNAMIC) != 0;
990 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
991 syms and defined syms in dynamic libraries respectively.
992 ref_dynamic on the other hand can be set for a symbol defined in
993 a dynamic library, and def_dynamic may not be set; When the
994 definition in a dynamic lib is overridden by a definition in the
995 executable use of the symbol in the dynamic lib becomes a
996 reference to the executable symbol. */
999 if (bfd_is_und_section (sec))
1001 if (bind != STB_WEAK)
1003 h->ref_dynamic_nonweak = 1;
1004 hi->ref_dynamic_nonweak = 1;
1010 hi->dynamic_def = 1;
1014 /* If we just created the symbol, mark it as being an ELF symbol.
1015 Other than that, there is nothing to do--there is no merge issue
1016 with a newly defined symbol--so we just return. */
1018 if (h->root.type == bfd_link_hash_new)
1024 /* In cases involving weak versioned symbols, we may wind up trying
1025 to merge a symbol with itself. Catch that here, to avoid the
1026 confusion that results if we try to override a symbol with
1027 itself. The additional tests catch cases like
1028 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1029 dynamic object, which we do want to handle here. */
1031 && (newweak || oldweak)
1032 && ((abfd->flags & DYNAMIC) == 0
1033 || !h->def_regular))
1038 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1039 else if (oldsec != NULL)
1041 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1042 indices used by MIPS ELF. */
1043 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1046 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1047 respectively, appear to be a definition rather than reference. */
1049 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1051 olddef = (h->root.type != bfd_link_hash_undefined
1052 && h->root.type != bfd_link_hash_undefweak
1053 && h->root.type != bfd_link_hash_common);
1055 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1056 respectively, appear to be a function. */
1058 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1059 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1061 oldfunc = (h->type != STT_NOTYPE
1062 && bed->is_function_type (h->type));
1064 /* When we try to create a default indirect symbol from the dynamic
1065 definition with the default version, we skip it if its type and
1066 the type of existing regular definition mismatch. */
1067 if (pold_alignment == NULL
1071 && (((olddef || h->root.type == bfd_link_hash_common)
1072 && ELF_ST_TYPE (sym->st_info) != h->type
1073 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1074 && h->type != STT_NOTYPE
1075 && !(newfunc && oldfunc))
1077 && ((h->type == STT_GNU_IFUNC)
1078 != (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)))))
1084 /* Check TLS symbols. We don't check undefined symbols introduced
1085 by "ld -u" which have no type (and oldbfd NULL), and we don't
1086 check symbols from plugins because they also have no type. */
1088 && (oldbfd->flags & BFD_PLUGIN) == 0
1089 && (abfd->flags & BFD_PLUGIN) == 0
1090 && ELF_ST_TYPE (sym->st_info) != h->type
1091 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1094 bfd_boolean ntdef, tdef;
1095 asection *ntsec, *tsec;
1097 if (h->type == STT_TLS)
1117 (*_bfd_error_handler)
1118 (_("%s: TLS definition in %B section %A "
1119 "mismatches non-TLS definition in %B section %A"),
1120 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1121 else if (!tdef && !ntdef)
1122 (*_bfd_error_handler)
1123 (_("%s: TLS reference in %B "
1124 "mismatches non-TLS reference in %B"),
1125 tbfd, ntbfd, h->root.root.string);
1127 (*_bfd_error_handler)
1128 (_("%s: TLS definition in %B section %A "
1129 "mismatches non-TLS reference in %B"),
1130 tbfd, tsec, ntbfd, h->root.root.string);
1132 (*_bfd_error_handler)
1133 (_("%s: TLS reference in %B "
1134 "mismatches non-TLS definition in %B section %A"),
1135 tbfd, ntbfd, ntsec, h->root.root.string);
1137 bfd_set_error (bfd_error_bad_value);
1141 /* If the old symbol has non-default visibility, we ignore the new
1142 definition from a dynamic object. */
1144 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1145 && !bfd_is_und_section (sec))
1148 /* Make sure this symbol is dynamic. */
1150 hi->ref_dynamic = 1;
1151 /* A protected symbol has external availability. Make sure it is
1152 recorded as dynamic.
1154 FIXME: Should we check type and size for protected symbol? */
1155 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1156 return bfd_elf_link_record_dynamic_symbol (info, h);
1161 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1164 /* If the new symbol with non-default visibility comes from a
1165 relocatable file and the old definition comes from a dynamic
1166 object, we remove the old definition. */
1167 if (hi->root.type == bfd_link_hash_indirect)
1169 /* Handle the case where the old dynamic definition is
1170 default versioned. We need to copy the symbol info from
1171 the symbol with default version to the normal one if it
1172 was referenced before. */
1175 hi->root.type = h->root.type;
1176 h->root.type = bfd_link_hash_indirect;
1177 (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
1179 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1180 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1182 /* If the new symbol is hidden or internal, completely undo
1183 any dynamic link state. */
1184 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1185 h->forced_local = 0;
1192 /* FIXME: Should we check type and size for protected symbol? */
1202 /* If the old symbol was undefined before, then it will still be
1203 on the undefs list. If the new symbol is undefined or
1204 common, we can't make it bfd_link_hash_new here, because new
1205 undefined or common symbols will be added to the undefs list
1206 by _bfd_generic_link_add_one_symbol. Symbols may not be
1207 added twice to the undefs list. Also, if the new symbol is
1208 undefweak then we don't want to lose the strong undef. */
1209 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1211 h->root.type = bfd_link_hash_undefined;
1212 h->root.u.undef.abfd = abfd;
1216 h->root.type = bfd_link_hash_new;
1217 h->root.u.undef.abfd = NULL;
1220 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1222 /* If the new symbol is hidden or internal, completely undo
1223 any dynamic link state. */
1224 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1225 h->forced_local = 0;
1231 /* FIXME: Should we check type and size for protected symbol? */
1237 /* If a new weak symbol definition comes from a regular file and the
1238 old symbol comes from a dynamic library, we treat the new one as
1239 strong. Similarly, an old weak symbol definition from a regular
1240 file is treated as strong when the new symbol comes from a dynamic
1241 library. Further, an old weak symbol from a dynamic library is
1242 treated as strong if the new symbol is from a dynamic library.
1243 This reflects the way glibc's ld.so works.
1245 Do this before setting *type_change_ok or *size_change_ok so that
1246 we warn properly when dynamic library symbols are overridden. */
1248 if (newdef && !newdyn && olddyn)
1250 if (olddef && newdyn)
1253 /* Allow changes between different types of function symbol. */
1254 if (newfunc && oldfunc)
1255 *type_change_ok = TRUE;
1257 /* It's OK to change the type if either the existing symbol or the
1258 new symbol is weak. A type change is also OK if the old symbol
1259 is undefined and the new symbol is defined. */
1264 && h->root.type == bfd_link_hash_undefined))
1265 *type_change_ok = TRUE;
1267 /* It's OK to change the size if either the existing symbol or the
1268 new symbol is weak, or if the old symbol is undefined. */
1271 || h->root.type == bfd_link_hash_undefined)
1272 *size_change_ok = TRUE;
1274 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1275 symbol, respectively, appears to be a common symbol in a dynamic
1276 object. If a symbol appears in an uninitialized section, and is
1277 not weak, and is not a function, then it may be a common symbol
1278 which was resolved when the dynamic object was created. We want
1279 to treat such symbols specially, because they raise special
1280 considerations when setting the symbol size: if the symbol
1281 appears as a common symbol in a regular object, and the size in
1282 the regular object is larger, we must make sure that we use the
1283 larger size. This problematic case can always be avoided in C,
1284 but it must be handled correctly when using Fortran shared
1287 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1288 likewise for OLDDYNCOMMON and OLDDEF.
1290 Note that this test is just a heuristic, and that it is quite
1291 possible to have an uninitialized symbol in a shared object which
1292 is really a definition, rather than a common symbol. This could
1293 lead to some minor confusion when the symbol really is a common
1294 symbol in some regular object. However, I think it will be
1300 && (sec->flags & SEC_ALLOC) != 0
1301 && (sec->flags & SEC_LOAD) == 0
1304 newdyncommon = TRUE;
1306 newdyncommon = FALSE;
1310 && h->root.type == bfd_link_hash_defined
1312 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1313 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1316 olddyncommon = TRUE;
1318 olddyncommon = FALSE;
1320 /* We now know everything about the old and new symbols. We ask the
1321 backend to check if we can merge them. */
1322 if (bed->merge_symbol != NULL)
1324 if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
1329 /* If both the old and the new symbols look like common symbols in a
1330 dynamic object, set the size of the symbol to the larger of the
1335 && sym->st_size != h->size)
1337 /* Since we think we have two common symbols, issue a multiple
1338 common warning if desired. Note that we only warn if the
1339 size is different. If the size is the same, we simply let
1340 the old symbol override the new one as normally happens with
1341 symbols defined in dynamic objects. */
1343 if (! ((*info->callbacks->multiple_common)
1344 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1347 if (sym->st_size > h->size)
1348 h->size = sym->st_size;
1350 *size_change_ok = TRUE;
1353 /* If we are looking at a dynamic object, and we have found a
1354 definition, we need to see if the symbol was already defined by
1355 some other object. If so, we want to use the existing
1356 definition, and we do not want to report a multiple symbol
1357 definition error; we do this by clobbering *PSEC to be
1358 bfd_und_section_ptr.
1360 We treat a common symbol as a definition if the symbol in the
1361 shared library is a function, since common symbols always
1362 represent variables; this can cause confusion in principle, but
1363 any such confusion would seem to indicate an erroneous program or
1364 shared library. We also permit a common symbol in a regular
1365 object to override a weak symbol in a shared object. */
1370 || (h->root.type == bfd_link_hash_common
1371 && (newweak || newfunc))))
1375 newdyncommon = FALSE;
1377 *psec = sec = bfd_und_section_ptr;
1378 *size_change_ok = TRUE;
1380 /* If we get here when the old symbol is a common symbol, then
1381 we are explicitly letting it override a weak symbol or
1382 function in a dynamic object, and we don't want to warn about
1383 a type change. If the old symbol is a defined symbol, a type
1384 change warning may still be appropriate. */
1386 if (h->root.type == bfd_link_hash_common)
1387 *type_change_ok = TRUE;
1390 /* Handle the special case of an old common symbol merging with a
1391 new symbol which looks like a common symbol in a shared object.
1392 We change *PSEC and *PVALUE to make the new symbol look like a
1393 common symbol, and let _bfd_generic_link_add_one_symbol do the
1397 && h->root.type == bfd_link_hash_common)
1401 newdyncommon = FALSE;
1402 *pvalue = sym->st_size;
1403 *psec = sec = bed->common_section (oldsec);
1404 *size_change_ok = TRUE;
1407 /* Skip weak definitions of symbols that are already defined. */
1408 if (newdef && olddef && newweak)
1410 /* Don't skip new non-IR weak syms. */
1411 if (!(oldbfd != NULL
1412 && (oldbfd->flags & BFD_PLUGIN) != 0
1413 && (abfd->flags & BFD_PLUGIN) == 0))
1419 /* Merge st_other. If the symbol already has a dynamic index,
1420 but visibility says it should not be visible, turn it into a
1422 elf_merge_st_other (abfd, h, sym, sec, newdef, newdyn);
1423 if (h->dynindx != -1)
1424 switch (ELF_ST_VISIBILITY (h->other))
1428 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1433 /* If the old symbol is from a dynamic object, and the new symbol is
1434 a definition which is not from a dynamic object, then the new
1435 symbol overrides the old symbol. Symbols from regular files
1436 always take precedence over symbols from dynamic objects, even if
1437 they are defined after the dynamic object in the link.
1439 As above, we again permit a common symbol in a regular object to
1440 override a definition in a shared object if the shared object
1441 symbol is a function or is weak. */
1446 || (bfd_is_com_section (sec)
1447 && (oldweak || oldfunc)))
1452 /* Change the hash table entry to undefined, and let
1453 _bfd_generic_link_add_one_symbol do the right thing with the
1456 h->root.type = bfd_link_hash_undefined;
1457 h->root.u.undef.abfd = h->root.u.def.section->owner;
1458 *size_change_ok = TRUE;
1461 olddyncommon = FALSE;
1463 /* We again permit a type change when a common symbol may be
1464 overriding a function. */
1466 if (bfd_is_com_section (sec))
1470 /* If a common symbol overrides a function, make sure
1471 that it isn't defined dynamically nor has type
1474 h->type = STT_NOTYPE;
1476 *type_change_ok = TRUE;
1479 if (hi->root.type == bfd_link_hash_indirect)
1482 /* This union may have been set to be non-NULL when this symbol
1483 was seen in a dynamic object. We must force the union to be
1484 NULL, so that it is correct for a regular symbol. */
1485 h->verinfo.vertree = NULL;
1488 /* Handle the special case of a new common symbol merging with an
1489 old symbol that looks like it might be a common symbol defined in
1490 a shared object. Note that we have already handled the case in
1491 which a new common symbol should simply override the definition
1492 in the shared library. */
1495 && bfd_is_com_section (sec)
1498 /* It would be best if we could set the hash table entry to a
1499 common symbol, but we don't know what to use for the section
1500 or the alignment. */
1501 if (! ((*info->callbacks->multiple_common)
1502 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1505 /* If the presumed common symbol in the dynamic object is
1506 larger, pretend that the new symbol has its size. */
1508 if (h->size > *pvalue)
1511 /* We need to remember the alignment required by the symbol
1512 in the dynamic object. */
1513 BFD_ASSERT (pold_alignment);
1514 *pold_alignment = h->root.u.def.section->alignment_power;
1517 olddyncommon = FALSE;
1519 h->root.type = bfd_link_hash_undefined;
1520 h->root.u.undef.abfd = h->root.u.def.section->owner;
1522 *size_change_ok = TRUE;
1523 *type_change_ok = TRUE;
1525 if (hi->root.type == bfd_link_hash_indirect)
1528 h->verinfo.vertree = NULL;
1533 /* Handle the case where we had a versioned symbol in a dynamic
1534 library and now find a definition in a normal object. In this
1535 case, we make the versioned symbol point to the normal one. */
1536 flip->root.type = h->root.type;
1537 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1538 h->root.type = bfd_link_hash_indirect;
1539 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1540 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1544 flip->ref_dynamic = 1;
1551 /* This function is called to create an indirect symbol from the
1552 default for the symbol with the default version if needed. The
1553 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1554 set DYNSYM if the new indirect symbol is dynamic. */
1557 _bfd_elf_add_default_symbol (bfd *abfd,
1558 struct bfd_link_info *info,
1559 struct elf_link_hash_entry *h,
1561 Elf_Internal_Sym *sym,
1565 bfd_boolean *dynsym)
1567 bfd_boolean type_change_ok;
1568 bfd_boolean size_change_ok;
1571 struct elf_link_hash_entry *hi;
1572 struct bfd_link_hash_entry *bh;
1573 const struct elf_backend_data *bed;
1574 bfd_boolean collect;
1575 bfd_boolean dynamic;
1576 bfd_boolean override;
1578 size_t len, shortlen;
1581 /* If this symbol has a version, and it is the default version, we
1582 create an indirect symbol from the default name to the fully
1583 decorated name. This will cause external references which do not
1584 specify a version to be bound to this version of the symbol. */
1585 p = strchr (name, ELF_VER_CHR);
1586 if (p == NULL || p[1] != ELF_VER_CHR)
1589 bed = get_elf_backend_data (abfd);
1590 collect = bed->collect;
1591 dynamic = (abfd->flags & DYNAMIC) != 0;
1593 shortlen = p - name;
1594 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1595 if (shortname == NULL)
1597 memcpy (shortname, name, shortlen);
1598 shortname[shortlen] = '\0';
1600 /* We are going to create a new symbol. Merge it with any existing
1601 symbol with this name. For the purposes of the merge, act as
1602 though we were defining the symbol we just defined, although we
1603 actually going to define an indirect symbol. */
1604 type_change_ok = FALSE;
1605 size_change_ok = FALSE;
1607 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1608 &hi, poldbfd, NULL, NULL, &skip, &override,
1609 &type_change_ok, &size_change_ok))
1618 if (! (_bfd_generic_link_add_one_symbol
1619 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1620 0, name, FALSE, collect, &bh)))
1622 hi = (struct elf_link_hash_entry *) bh;
1626 /* In this case the symbol named SHORTNAME is overriding the
1627 indirect symbol we want to add. We were planning on making
1628 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1629 is the name without a version. NAME is the fully versioned
1630 name, and it is the default version.
1632 Overriding means that we already saw a definition for the
1633 symbol SHORTNAME in a regular object, and it is overriding
1634 the symbol defined in the dynamic object.
1636 When this happens, we actually want to change NAME, the
1637 symbol we just added, to refer to SHORTNAME. This will cause
1638 references to NAME in the shared object to become references
1639 to SHORTNAME in the regular object. This is what we expect
1640 when we override a function in a shared object: that the
1641 references in the shared object will be mapped to the
1642 definition in the regular object. */
1644 while (hi->root.type == bfd_link_hash_indirect
1645 || hi->root.type == bfd_link_hash_warning)
1646 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1648 h->root.type = bfd_link_hash_indirect;
1649 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1653 hi->ref_dynamic = 1;
1657 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1662 /* Now set HI to H, so that the following code will set the
1663 other fields correctly. */
1667 /* Check if HI is a warning symbol. */
1668 if (hi->root.type == bfd_link_hash_warning)
1669 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1671 /* If there is a duplicate definition somewhere, then HI may not
1672 point to an indirect symbol. We will have reported an error to
1673 the user in that case. */
1675 if (hi->root.type == bfd_link_hash_indirect)
1677 struct elf_link_hash_entry *ht;
1679 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1680 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1682 /* A reference to the SHORTNAME symbol from a dynamic library
1683 will be satisfied by the versioned symbol at runtime. In
1684 effect, we have a reference to the versioned symbol. */
1685 ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1686 hi->dynamic_def |= ht->dynamic_def;
1688 /* See if the new flags lead us to realize that the symbol must
1694 if (! info->executable
1701 if (hi->ref_regular)
1707 /* We also need to define an indirection from the nondefault version
1711 len = strlen (name);
1712 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1713 if (shortname == NULL)
1715 memcpy (shortname, name, shortlen);
1716 memcpy (shortname + shortlen, p + 1, len - shortlen);
1718 /* Once again, merge with any existing symbol. */
1719 type_change_ok = FALSE;
1720 size_change_ok = FALSE;
1722 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1723 &hi, poldbfd, NULL, NULL, &skip, &override,
1724 &type_change_ok, &size_change_ok))
1732 /* Here SHORTNAME is a versioned name, so we don't expect to see
1733 the type of override we do in the case above unless it is
1734 overridden by a versioned definition. */
1735 if (hi->root.type != bfd_link_hash_defined
1736 && hi->root.type != bfd_link_hash_defweak)
1737 (*_bfd_error_handler)
1738 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1744 if (! (_bfd_generic_link_add_one_symbol
1745 (info, abfd, shortname, BSF_INDIRECT,
1746 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1748 hi = (struct elf_link_hash_entry *) bh;
1750 /* If there is a duplicate definition somewhere, then HI may not
1751 point to an indirect symbol. We will have reported an error
1752 to the user in that case. */
1754 if (hi->root.type == bfd_link_hash_indirect)
1756 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1757 h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1758 hi->dynamic_def |= h->dynamic_def;
1760 /* See if the new flags lead us to realize that the symbol
1766 if (! info->executable
1772 if (hi->ref_regular)
1782 /* This routine is used to export all defined symbols into the dynamic
1783 symbol table. It is called via elf_link_hash_traverse. */
1786 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1788 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1790 /* Ignore indirect symbols. These are added by the versioning code. */
1791 if (h->root.type == bfd_link_hash_indirect)
1794 /* Ignore this if we won't export it. */
1795 if (!eif->info->export_dynamic && !h->dynamic)
1798 if (h->dynindx == -1
1799 && (h->def_regular || h->ref_regular)
1800 && ! bfd_hide_sym_by_version (eif->info->version_info,
1801 h->root.root.string))
1803 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1813 /* Look through the symbols which are defined in other shared
1814 libraries and referenced here. Update the list of version
1815 dependencies. This will be put into the .gnu.version_r section.
1816 This function is called via elf_link_hash_traverse. */
1819 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1822 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1823 Elf_Internal_Verneed *t;
1824 Elf_Internal_Vernaux *a;
1827 /* We only care about symbols defined in shared objects with version
1832 || h->verinfo.verdef == NULL
1833 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
1834 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
1837 /* See if we already know about this version. */
1838 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1842 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1845 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1846 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1852 /* This is a new version. Add it to tree we are building. */
1857 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1860 rinfo->failed = TRUE;
1864 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1865 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1866 elf_tdata (rinfo->info->output_bfd)->verref = t;
1870 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1873 rinfo->failed = TRUE;
1877 /* Note that we are copying a string pointer here, and testing it
1878 above. If bfd_elf_string_from_elf_section is ever changed to
1879 discard the string data when low in memory, this will have to be
1881 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1883 a->vna_flags = h->verinfo.verdef->vd_flags;
1884 a->vna_nextptr = t->vn_auxptr;
1886 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1889 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1896 /* Figure out appropriate versions for all the symbols. We may not
1897 have the version number script until we have read all of the input
1898 files, so until that point we don't know which symbols should be
1899 local. This function is called via elf_link_hash_traverse. */
1902 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1904 struct elf_info_failed *sinfo;
1905 struct bfd_link_info *info;
1906 const struct elf_backend_data *bed;
1907 struct elf_info_failed eif;
1911 sinfo = (struct elf_info_failed *) data;
1914 /* Fix the symbol flags. */
1917 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1920 sinfo->failed = TRUE;
1924 /* We only need version numbers for symbols defined in regular
1926 if (!h->def_regular)
1929 bed = get_elf_backend_data (info->output_bfd);
1930 p = strchr (h->root.root.string, ELF_VER_CHR);
1931 if (p != NULL && h->verinfo.vertree == NULL)
1933 struct bfd_elf_version_tree *t;
1938 /* There are two consecutive ELF_VER_CHR characters if this is
1939 not a hidden symbol. */
1941 if (*p == ELF_VER_CHR)
1947 /* If there is no version string, we can just return out. */
1955 /* Look for the version. If we find it, it is no longer weak. */
1956 for (t = sinfo->info->version_info; t != NULL; t = t->next)
1958 if (strcmp (t->name, p) == 0)
1962 struct bfd_elf_version_expr *d;
1964 len = p - h->root.root.string;
1965 alc = (char *) bfd_malloc (len);
1968 sinfo->failed = TRUE;
1971 memcpy (alc, h->root.root.string, len - 1);
1972 alc[len - 1] = '\0';
1973 if (alc[len - 2] == ELF_VER_CHR)
1974 alc[len - 2] = '\0';
1976 h->verinfo.vertree = t;
1980 if (t->globals.list != NULL)
1981 d = (*t->match) (&t->globals, NULL, alc);
1983 /* See if there is anything to force this symbol to
1985 if (d == NULL && t->locals.list != NULL)
1987 d = (*t->match) (&t->locals, NULL, alc);
1990 && ! info->export_dynamic)
1991 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1999 /* If we are building an application, we need to create a
2000 version node for this version. */
2001 if (t == NULL && info->executable)
2003 struct bfd_elf_version_tree **pp;
2006 /* If we aren't going to export this symbol, we don't need
2007 to worry about it. */
2008 if (h->dynindx == -1)
2012 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2015 sinfo->failed = TRUE;
2020 t->name_indx = (unsigned int) -1;
2024 /* Don't count anonymous version tag. */
2025 if (sinfo->info->version_info != NULL
2026 && sinfo->info->version_info->vernum == 0)
2028 for (pp = &sinfo->info->version_info;
2032 t->vernum = version_index;
2036 h->verinfo.vertree = t;
2040 /* We could not find the version for a symbol when
2041 generating a shared archive. Return an error. */
2042 (*_bfd_error_handler)
2043 (_("%B: version node not found for symbol %s"),
2044 info->output_bfd, h->root.root.string);
2045 bfd_set_error (bfd_error_bad_value);
2046 sinfo->failed = TRUE;
2054 /* If we don't have a version for this symbol, see if we can find
2056 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2061 = bfd_find_version_for_sym (sinfo->info->version_info,
2062 h->root.root.string, &hide);
2063 if (h->verinfo.vertree != NULL && hide)
2064 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2070 /* Read and swap the relocs from the section indicated by SHDR. This
2071 may be either a REL or a RELA section. The relocations are
2072 translated into RELA relocations and stored in INTERNAL_RELOCS,
2073 which should have already been allocated to contain enough space.
2074 The EXTERNAL_RELOCS are a buffer where the external form of the
2075 relocations should be stored.
2077 Returns FALSE if something goes wrong. */
2080 elf_link_read_relocs_from_section (bfd *abfd,
2082 Elf_Internal_Shdr *shdr,
2083 void *external_relocs,
2084 Elf_Internal_Rela *internal_relocs)
2086 const struct elf_backend_data *bed;
2087 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2088 const bfd_byte *erela;
2089 const bfd_byte *erelaend;
2090 Elf_Internal_Rela *irela;
2091 Elf_Internal_Shdr *symtab_hdr;
2094 /* Position ourselves at the start of the section. */
2095 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2098 /* Read the relocations. */
2099 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2102 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2103 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2105 bed = get_elf_backend_data (abfd);
2107 /* Convert the external relocations to the internal format. */
2108 if (shdr->sh_entsize == bed->s->sizeof_rel)
2109 swap_in = bed->s->swap_reloc_in;
2110 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2111 swap_in = bed->s->swap_reloca_in;
2114 bfd_set_error (bfd_error_wrong_format);
2118 erela = (const bfd_byte *) external_relocs;
2119 erelaend = erela + shdr->sh_size;
2120 irela = internal_relocs;
2121 while (erela < erelaend)
2125 (*swap_in) (abfd, erela, irela);
2126 r_symndx = ELF32_R_SYM (irela->r_info);
2127 if (bed->s->arch_size == 64)
2131 if ((size_t) r_symndx >= nsyms)
2133 (*_bfd_error_handler)
2134 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2135 " for offset 0x%lx in section `%A'"),
2137 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2138 bfd_set_error (bfd_error_bad_value);
2142 else if (r_symndx != STN_UNDEF)
2144 (*_bfd_error_handler)
2145 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2146 " when the object file has no symbol table"),
2148 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2149 bfd_set_error (bfd_error_bad_value);
2152 irela += bed->s->int_rels_per_ext_rel;
2153 erela += shdr->sh_entsize;
2159 /* Read and swap the relocs for a section O. They may have been
2160 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2161 not NULL, they are used as buffers to read into. They are known to
2162 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2163 the return value is allocated using either malloc or bfd_alloc,
2164 according to the KEEP_MEMORY argument. If O has two relocation
2165 sections (both REL and RELA relocations), then the REL_HDR
2166 relocations will appear first in INTERNAL_RELOCS, followed by the
2167 RELA_HDR relocations. */
2170 _bfd_elf_link_read_relocs (bfd *abfd,
2172 void *external_relocs,
2173 Elf_Internal_Rela *internal_relocs,
2174 bfd_boolean keep_memory)
2176 void *alloc1 = NULL;
2177 Elf_Internal_Rela *alloc2 = NULL;
2178 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2179 struct bfd_elf_section_data *esdo = elf_section_data (o);
2180 Elf_Internal_Rela *internal_rela_relocs;
2182 if (esdo->relocs != NULL)
2183 return esdo->relocs;
2185 if (o->reloc_count == 0)
2188 if (internal_relocs == NULL)
2192 size = o->reloc_count;
2193 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2195 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2197 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2198 if (internal_relocs == NULL)
2202 if (external_relocs == NULL)
2204 bfd_size_type size = 0;
2207 size += esdo->rel.hdr->sh_size;
2209 size += esdo->rela.hdr->sh_size;
2211 alloc1 = bfd_malloc (size);
2214 external_relocs = alloc1;
2217 internal_rela_relocs = internal_relocs;
2220 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2224 external_relocs = (((bfd_byte *) external_relocs)
2225 + esdo->rel.hdr->sh_size);
2226 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2227 * bed->s->int_rels_per_ext_rel);
2231 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2233 internal_rela_relocs)))
2236 /* Cache the results for next time, if we can. */
2238 esdo->relocs = internal_relocs;
2243 /* Don't free alloc2, since if it was allocated we are passing it
2244 back (under the name of internal_relocs). */
2246 return internal_relocs;
2254 bfd_release (abfd, alloc2);
2261 /* Compute the size of, and allocate space for, REL_HDR which is the
2262 section header for a section containing relocations for O. */
2265 _bfd_elf_link_size_reloc_section (bfd *abfd,
2266 struct bfd_elf_section_reloc_data *reldata)
2268 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2270 /* That allows us to calculate the size of the section. */
2271 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2273 /* The contents field must last into write_object_contents, so we
2274 allocate it with bfd_alloc rather than malloc. Also since we
2275 cannot be sure that the contents will actually be filled in,
2276 we zero the allocated space. */
2277 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2278 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2281 if (reldata->hashes == NULL && reldata->count)
2283 struct elf_link_hash_entry **p;
2285 p = ((struct elf_link_hash_entry **)
2286 bfd_zmalloc (reldata->count * sizeof (*p)));
2290 reldata->hashes = p;
2296 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2297 originated from the section given by INPUT_REL_HDR) to the
2301 _bfd_elf_link_output_relocs (bfd *output_bfd,
2302 asection *input_section,
2303 Elf_Internal_Shdr *input_rel_hdr,
2304 Elf_Internal_Rela *internal_relocs,
2305 struct elf_link_hash_entry **rel_hash
2308 Elf_Internal_Rela *irela;
2309 Elf_Internal_Rela *irelaend;
2311 struct bfd_elf_section_reloc_data *output_reldata;
2312 asection *output_section;
2313 const struct elf_backend_data *bed;
2314 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2315 struct bfd_elf_section_data *esdo;
2317 output_section = input_section->output_section;
2319 bed = get_elf_backend_data (output_bfd);
2320 esdo = elf_section_data (output_section);
2321 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2323 output_reldata = &esdo->rel;
2324 swap_out = bed->s->swap_reloc_out;
2326 else if (esdo->rela.hdr
2327 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2329 output_reldata = &esdo->rela;
2330 swap_out = bed->s->swap_reloca_out;
2334 (*_bfd_error_handler)
2335 (_("%B: relocation size mismatch in %B section %A"),
2336 output_bfd, input_section->owner, input_section);
2337 bfd_set_error (bfd_error_wrong_format);
2341 erel = output_reldata->hdr->contents;
2342 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2343 irela = internal_relocs;
2344 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2345 * bed->s->int_rels_per_ext_rel);
2346 while (irela < irelaend)
2348 (*swap_out) (output_bfd, irela, erel);
2349 irela += bed->s->int_rels_per_ext_rel;
2350 erel += input_rel_hdr->sh_entsize;
2353 /* Bump the counter, so that we know where to add the next set of
2355 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2360 /* Make weak undefined symbols in PIE dynamic. */
2363 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2364 struct elf_link_hash_entry *h)
2368 && h->root.type == bfd_link_hash_undefweak)
2369 return bfd_elf_link_record_dynamic_symbol (info, h);
2374 /* Fix up the flags for a symbol. This handles various cases which
2375 can only be fixed after all the input files are seen. This is
2376 currently called by both adjust_dynamic_symbol and
2377 assign_sym_version, which is unnecessary but perhaps more robust in
2378 the face of future changes. */
2381 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2382 struct elf_info_failed *eif)
2384 const struct elf_backend_data *bed;
2386 /* If this symbol was mentioned in a non-ELF file, try to set
2387 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2388 permit a non-ELF file to correctly refer to a symbol defined in
2389 an ELF dynamic object. */
2392 while (h->root.type == bfd_link_hash_indirect)
2393 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2395 if (h->root.type != bfd_link_hash_defined
2396 && h->root.type != bfd_link_hash_defweak)
2399 h->ref_regular_nonweak = 1;
2403 if (h->root.u.def.section->owner != NULL
2404 && (bfd_get_flavour (h->root.u.def.section->owner)
2405 == bfd_target_elf_flavour))
2408 h->ref_regular_nonweak = 1;
2414 if (h->dynindx == -1
2418 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2427 /* Unfortunately, NON_ELF is only correct if the symbol
2428 was first seen in a non-ELF file. Fortunately, if the symbol
2429 was first seen in an ELF file, we're probably OK unless the
2430 symbol was defined in a non-ELF file. Catch that case here.
2431 FIXME: We're still in trouble if the symbol was first seen in
2432 a dynamic object, and then later in a non-ELF regular object. */
2433 if ((h->root.type == bfd_link_hash_defined
2434 || h->root.type == bfd_link_hash_defweak)
2436 && (h->root.u.def.section->owner != NULL
2437 ? (bfd_get_flavour (h->root.u.def.section->owner)
2438 != bfd_target_elf_flavour)
2439 : (bfd_is_abs_section (h->root.u.def.section)
2440 && !h->def_dynamic)))
2444 /* Backend specific symbol fixup. */
2445 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2446 if (bed->elf_backend_fixup_symbol
2447 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2450 /* If this is a final link, and the symbol was defined as a common
2451 symbol in a regular object file, and there was no definition in
2452 any dynamic object, then the linker will have allocated space for
2453 the symbol in a common section but the DEF_REGULAR
2454 flag will not have been set. */
2455 if (h->root.type == bfd_link_hash_defined
2459 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2462 /* If -Bsymbolic was used (which means to bind references to global
2463 symbols to the definition within the shared object), and this
2464 symbol was defined in a regular object, then it actually doesn't
2465 need a PLT entry. Likewise, if the symbol has non-default
2466 visibility. If the symbol has hidden or internal visibility, we
2467 will force it local. */
2469 && eif->info->shared
2470 && is_elf_hash_table (eif->info->hash)
2471 && (SYMBOLIC_BIND (eif->info, h)
2472 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2475 bfd_boolean force_local;
2477 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2478 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2479 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2482 /* If a weak undefined symbol has non-default visibility, we also
2483 hide it from the dynamic linker. */
2484 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2485 && h->root.type == bfd_link_hash_undefweak)
2486 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2488 /* If this is a weak defined symbol in a dynamic object, and we know
2489 the real definition in the dynamic object, copy interesting flags
2490 over to the real definition. */
2491 if (h->u.weakdef != NULL)
2493 /* If the real definition is defined by a regular object file,
2494 don't do anything special. See the longer description in
2495 _bfd_elf_adjust_dynamic_symbol, below. */
2496 if (h->u.weakdef->def_regular)
2497 h->u.weakdef = NULL;
2500 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2502 while (h->root.type == bfd_link_hash_indirect)
2503 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2505 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2506 || h->root.type == bfd_link_hash_defweak);
2507 BFD_ASSERT (weakdef->def_dynamic);
2508 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2509 || weakdef->root.type == bfd_link_hash_defweak);
2510 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2517 /* Make the backend pick a good value for a dynamic symbol. This is
2518 called via elf_link_hash_traverse, and also calls itself
2522 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2524 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2526 const struct elf_backend_data *bed;
2528 if (! is_elf_hash_table (eif->info->hash))
2531 /* Ignore indirect symbols. These are added by the versioning code. */
2532 if (h->root.type == bfd_link_hash_indirect)
2535 /* Fix the symbol flags. */
2536 if (! _bfd_elf_fix_symbol_flags (h, eif))
2539 /* If this symbol does not require a PLT entry, and it is not
2540 defined by a dynamic object, or is not referenced by a regular
2541 object, ignore it. We do have to handle a weak defined symbol,
2542 even if no regular object refers to it, if we decided to add it
2543 to the dynamic symbol table. FIXME: Do we normally need to worry
2544 about symbols which are defined by one dynamic object and
2545 referenced by another one? */
2547 && h->type != STT_GNU_IFUNC
2551 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2553 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2557 /* If we've already adjusted this symbol, don't do it again. This
2558 can happen via a recursive call. */
2559 if (h->dynamic_adjusted)
2562 /* Don't look at this symbol again. Note that we must set this
2563 after checking the above conditions, because we may look at a
2564 symbol once, decide not to do anything, and then get called
2565 recursively later after REF_REGULAR is set below. */
2566 h->dynamic_adjusted = 1;
2568 /* If this is a weak definition, and we know a real definition, and
2569 the real symbol is not itself defined by a regular object file,
2570 then get a good value for the real definition. We handle the
2571 real symbol first, for the convenience of the backend routine.
2573 Note that there is a confusing case here. If the real definition
2574 is defined by a regular object file, we don't get the real symbol
2575 from the dynamic object, but we do get the weak symbol. If the
2576 processor backend uses a COPY reloc, then if some routine in the
2577 dynamic object changes the real symbol, we will not see that
2578 change in the corresponding weak symbol. This is the way other
2579 ELF linkers work as well, and seems to be a result of the shared
2582 I will clarify this issue. Most SVR4 shared libraries define the
2583 variable _timezone and define timezone as a weak synonym. The
2584 tzset call changes _timezone. If you write
2585 extern int timezone;
2587 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2588 you might expect that, since timezone is a synonym for _timezone,
2589 the same number will print both times. However, if the processor
2590 backend uses a COPY reloc, then actually timezone will be copied
2591 into your process image, and, since you define _timezone
2592 yourself, _timezone will not. Thus timezone and _timezone will
2593 wind up at different memory locations. The tzset call will set
2594 _timezone, leaving timezone unchanged. */
2596 if (h->u.weakdef != NULL)
2598 /* If we get to this point, there is an implicit reference to
2599 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2600 h->u.weakdef->ref_regular = 1;
2602 /* Ensure that the backend adjust_dynamic_symbol function sees
2603 H->U.WEAKDEF before H by recursively calling ourselves. */
2604 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2608 /* If a symbol has no type and no size and does not require a PLT
2609 entry, then we are probably about to do the wrong thing here: we
2610 are probably going to create a COPY reloc for an empty object.
2611 This case can arise when a shared object is built with assembly
2612 code, and the assembly code fails to set the symbol type. */
2614 && h->type == STT_NOTYPE
2616 (*_bfd_error_handler)
2617 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2618 h->root.root.string);
2620 dynobj = elf_hash_table (eif->info)->dynobj;
2621 bed = get_elf_backend_data (dynobj);
2623 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2632 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2636 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info,
2637 struct elf_link_hash_entry *h,
2640 unsigned int power_of_two;
2642 asection *sec = h->root.u.def.section;
2644 /* The section aligment of definition is the maximum alignment
2645 requirement of symbols defined in the section. Since we don't
2646 know the symbol alignment requirement, we start with the
2647 maximum alignment and check low bits of the symbol address
2648 for the minimum alignment. */
2649 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2650 mask = ((bfd_vma) 1 << power_of_two) - 1;
2651 while ((h->root.u.def.value & mask) != 0)
2657 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2660 /* Adjust the section alignment if needed. */
2661 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2666 /* We make sure that the symbol will be aligned properly. */
2667 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2669 /* Define the symbol as being at this point in DYNBSS. */
2670 h->root.u.def.section = dynbss;
2671 h->root.u.def.value = dynbss->size;
2673 /* Increment the size of DYNBSS to make room for the symbol. */
2674 dynbss->size += h->size;
2676 /* No error if extern_protected_data is true. */
2677 if (h->protected_def
2678 && !get_elf_backend_data (dynbss->owner)->extern_protected_data)
2679 info->callbacks->einfo
2680 (_("%P: copy reloc against protected `%T' is dangerous\n"),
2681 h->root.root.string);
2686 /* Adjust all external symbols pointing into SEC_MERGE sections
2687 to reflect the object merging within the sections. */
2690 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2694 if ((h->root.type == bfd_link_hash_defined
2695 || h->root.type == bfd_link_hash_defweak)
2696 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2697 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2699 bfd *output_bfd = (bfd *) data;
2701 h->root.u.def.value =
2702 _bfd_merged_section_offset (output_bfd,
2703 &h->root.u.def.section,
2704 elf_section_data (sec)->sec_info,
2705 h->root.u.def.value);
2711 /* Returns false if the symbol referred to by H should be considered
2712 to resolve local to the current module, and true if it should be
2713 considered to bind dynamically. */
2716 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2717 struct bfd_link_info *info,
2718 bfd_boolean not_local_protected)
2720 bfd_boolean binding_stays_local_p;
2721 const struct elf_backend_data *bed;
2722 struct elf_link_hash_table *hash_table;
2727 while (h->root.type == bfd_link_hash_indirect
2728 || h->root.type == bfd_link_hash_warning)
2729 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2731 /* If it was forced local, then clearly it's not dynamic. */
2732 if (h->dynindx == -1)
2734 if (h->forced_local)
2737 /* Identify the cases where name binding rules say that a
2738 visible symbol resolves locally. */
2739 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2741 switch (ELF_ST_VISIBILITY (h->other))
2748 hash_table = elf_hash_table (info);
2749 if (!is_elf_hash_table (hash_table))
2752 bed = get_elf_backend_data (hash_table->dynobj);
2754 /* Proper resolution for function pointer equality may require
2755 that these symbols perhaps be resolved dynamically, even though
2756 we should be resolving them to the current module. */
2757 if (!not_local_protected || !bed->is_function_type (h->type))
2758 binding_stays_local_p = TRUE;
2765 /* If it isn't defined locally, then clearly it's dynamic. */
2766 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2769 /* Otherwise, the symbol is dynamic if binding rules don't tell
2770 us that it remains local. */
2771 return !binding_stays_local_p;
2774 /* Return true if the symbol referred to by H should be considered
2775 to resolve local to the current module, and false otherwise. Differs
2776 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2777 undefined symbols. The two functions are virtually identical except
2778 for the place where forced_local and dynindx == -1 are tested. If
2779 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2780 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2781 the symbol is local only for defined symbols.
2782 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2783 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2784 treatment of undefined weak symbols. For those that do not make
2785 undefined weak symbols dynamic, both functions may return false. */
2788 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2789 struct bfd_link_info *info,
2790 bfd_boolean local_protected)
2792 const struct elf_backend_data *bed;
2793 struct elf_link_hash_table *hash_table;
2795 /* If it's a local sym, of course we resolve locally. */
2799 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2800 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2801 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2804 /* Common symbols that become definitions don't get the DEF_REGULAR
2805 flag set, so test it first, and don't bail out. */
2806 if (ELF_COMMON_DEF_P (h))
2808 /* If we don't have a definition in a regular file, then we can't
2809 resolve locally. The sym is either undefined or dynamic. */
2810 else if (!h->def_regular)
2813 /* Forced local symbols resolve locally. */
2814 if (h->forced_local)
2817 /* As do non-dynamic symbols. */
2818 if (h->dynindx == -1)
2821 /* At this point, we know the symbol is defined and dynamic. In an
2822 executable it must resolve locally, likewise when building symbolic
2823 shared libraries. */
2824 if (info->executable || SYMBOLIC_BIND (info, h))
2827 /* Now deal with defined dynamic symbols in shared libraries. Ones
2828 with default visibility might not resolve locally. */
2829 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2832 hash_table = elf_hash_table (info);
2833 if (!is_elf_hash_table (hash_table))
2836 bed = get_elf_backend_data (hash_table->dynobj);
2838 /* If extern_protected_data is false, STV_PROTECTED non-function
2839 symbols are local. */
2840 if (!bed->extern_protected_data && !bed->is_function_type (h->type))
2843 /* Function pointer equality tests may require that STV_PROTECTED
2844 symbols be treated as dynamic symbols. If the address of a
2845 function not defined in an executable is set to that function's
2846 plt entry in the executable, then the address of the function in
2847 a shared library must also be the plt entry in the executable. */
2848 return local_protected;
2851 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2852 aligned. Returns the first TLS output section. */
2854 struct bfd_section *
2855 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2857 struct bfd_section *sec, *tls;
2858 unsigned int align = 0;
2860 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2861 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2865 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2866 if (sec->alignment_power > align)
2867 align = sec->alignment_power;
2869 elf_hash_table (info)->tls_sec = tls;
2871 /* Ensure the alignment of the first section is the largest alignment,
2872 so that the tls segment starts aligned. */
2874 tls->alignment_power = align;
2879 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2881 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2882 Elf_Internal_Sym *sym)
2884 const struct elf_backend_data *bed;
2886 /* Local symbols do not count, but target specific ones might. */
2887 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2888 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2891 bed = get_elf_backend_data (abfd);
2892 /* Function symbols do not count. */
2893 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2896 /* If the section is undefined, then so is the symbol. */
2897 if (sym->st_shndx == SHN_UNDEF)
2900 /* If the symbol is defined in the common section, then
2901 it is a common definition and so does not count. */
2902 if (bed->common_definition (sym))
2905 /* If the symbol is in a target specific section then we
2906 must rely upon the backend to tell us what it is. */
2907 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2908 /* FIXME - this function is not coded yet:
2910 return _bfd_is_global_symbol_definition (abfd, sym);
2912 Instead for now assume that the definition is not global,
2913 Even if this is wrong, at least the linker will behave
2914 in the same way that it used to do. */
2920 /* Search the symbol table of the archive element of the archive ABFD
2921 whose archive map contains a mention of SYMDEF, and determine if
2922 the symbol is defined in this element. */
2924 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2926 Elf_Internal_Shdr * hdr;
2927 bfd_size_type symcount;
2928 bfd_size_type extsymcount;
2929 bfd_size_type extsymoff;
2930 Elf_Internal_Sym *isymbuf;
2931 Elf_Internal_Sym *isym;
2932 Elf_Internal_Sym *isymend;
2935 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2939 if (! bfd_check_format (abfd, bfd_object))
2942 /* Select the appropriate symbol table. */
2943 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2944 hdr = &elf_tdata (abfd)->symtab_hdr;
2946 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2948 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2950 /* The sh_info field of the symtab header tells us where the
2951 external symbols start. We don't care about the local symbols. */
2952 if (elf_bad_symtab (abfd))
2954 extsymcount = symcount;
2959 extsymcount = symcount - hdr->sh_info;
2960 extsymoff = hdr->sh_info;
2963 if (extsymcount == 0)
2966 /* Read in the symbol table. */
2967 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2969 if (isymbuf == NULL)
2972 /* Scan the symbol table looking for SYMDEF. */
2974 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
2978 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
2983 if (strcmp (name, symdef->name) == 0)
2985 result = is_global_data_symbol_definition (abfd, isym);
2995 /* Add an entry to the .dynamic table. */
2998 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3002 struct elf_link_hash_table *hash_table;
3003 const struct elf_backend_data *bed;
3005 bfd_size_type newsize;
3006 bfd_byte *newcontents;
3007 Elf_Internal_Dyn dyn;
3009 hash_table = elf_hash_table (info);
3010 if (! is_elf_hash_table (hash_table))
3013 bed = get_elf_backend_data (hash_table->dynobj);
3014 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3015 BFD_ASSERT (s != NULL);
3017 newsize = s->size + bed->s->sizeof_dyn;
3018 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3019 if (newcontents == NULL)
3023 dyn.d_un.d_val = val;
3024 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3027 s->contents = newcontents;
3032 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3033 otherwise just check whether one already exists. Returns -1 on error,
3034 1 if a DT_NEEDED tag already exists, and 0 on success. */
3037 elf_add_dt_needed_tag (bfd *abfd,
3038 struct bfd_link_info *info,
3042 struct elf_link_hash_table *hash_table;
3043 bfd_size_type strindex;
3045 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3048 hash_table = elf_hash_table (info);
3049 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3050 if (strindex == (bfd_size_type) -1)
3053 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3056 const struct elf_backend_data *bed;
3059 bed = get_elf_backend_data (hash_table->dynobj);
3060 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3062 for (extdyn = sdyn->contents;
3063 extdyn < sdyn->contents + sdyn->size;
3064 extdyn += bed->s->sizeof_dyn)
3066 Elf_Internal_Dyn dyn;
3068 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3069 if (dyn.d_tag == DT_NEEDED
3070 && dyn.d_un.d_val == strindex)
3072 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3080 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3083 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3087 /* We were just checking for existence of the tag. */
3088 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3094 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3096 for (; needed != NULL; needed = needed->next)
3097 if ((elf_dyn_lib_class (needed->by) & DYN_AS_NEEDED) == 0
3098 && strcmp (soname, needed->name) == 0)
3104 /* Sort symbol by value, section, and size. */
3106 elf_sort_symbol (const void *arg1, const void *arg2)
3108 const struct elf_link_hash_entry *h1;
3109 const struct elf_link_hash_entry *h2;
3110 bfd_signed_vma vdiff;
3112 h1 = *(const struct elf_link_hash_entry **) arg1;
3113 h2 = *(const struct elf_link_hash_entry **) arg2;
3114 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3116 return vdiff > 0 ? 1 : -1;
3119 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3121 return sdiff > 0 ? 1 : -1;
3123 vdiff = h1->size - h2->size;
3124 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3127 /* This function is used to adjust offsets into .dynstr for
3128 dynamic symbols. This is called via elf_link_hash_traverse. */
3131 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3133 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3135 if (h->dynindx != -1)
3136 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3140 /* Assign string offsets in .dynstr, update all structures referencing
3144 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3146 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3147 struct elf_link_local_dynamic_entry *entry;
3148 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3149 bfd *dynobj = hash_table->dynobj;
3152 const struct elf_backend_data *bed;
3155 _bfd_elf_strtab_finalize (dynstr);
3156 size = _bfd_elf_strtab_size (dynstr);
3158 bed = get_elf_backend_data (dynobj);
3159 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3160 BFD_ASSERT (sdyn != NULL);
3162 /* Update all .dynamic entries referencing .dynstr strings. */
3163 for (extdyn = sdyn->contents;
3164 extdyn < sdyn->contents + sdyn->size;
3165 extdyn += bed->s->sizeof_dyn)
3167 Elf_Internal_Dyn dyn;
3169 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3173 dyn.d_un.d_val = size;
3183 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3188 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3191 /* Now update local dynamic symbols. */
3192 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3193 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3194 entry->isym.st_name);
3196 /* And the rest of dynamic symbols. */
3197 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3199 /* Adjust version definitions. */
3200 if (elf_tdata (output_bfd)->cverdefs)
3205 Elf_Internal_Verdef def;
3206 Elf_Internal_Verdaux defaux;
3208 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3212 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3214 p += sizeof (Elf_External_Verdef);
3215 if (def.vd_aux != sizeof (Elf_External_Verdef))
3217 for (i = 0; i < def.vd_cnt; ++i)
3219 _bfd_elf_swap_verdaux_in (output_bfd,
3220 (Elf_External_Verdaux *) p, &defaux);
3221 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3223 _bfd_elf_swap_verdaux_out (output_bfd,
3224 &defaux, (Elf_External_Verdaux *) p);
3225 p += sizeof (Elf_External_Verdaux);
3228 while (def.vd_next);
3231 /* Adjust version references. */
3232 if (elf_tdata (output_bfd)->verref)
3237 Elf_Internal_Verneed need;
3238 Elf_Internal_Vernaux needaux;
3240 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3244 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3246 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3247 _bfd_elf_swap_verneed_out (output_bfd, &need,
3248 (Elf_External_Verneed *) p);
3249 p += sizeof (Elf_External_Verneed);
3250 for (i = 0; i < need.vn_cnt; ++i)
3252 _bfd_elf_swap_vernaux_in (output_bfd,
3253 (Elf_External_Vernaux *) p, &needaux);
3254 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3256 _bfd_elf_swap_vernaux_out (output_bfd,
3258 (Elf_External_Vernaux *) p);
3259 p += sizeof (Elf_External_Vernaux);
3262 while (need.vn_next);
3268 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3269 The default is to only match when the INPUT and OUTPUT are exactly
3273 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3274 const bfd_target *output)
3276 return input == output;
3279 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3280 This version is used when different targets for the same architecture
3281 are virtually identical. */
3284 _bfd_elf_relocs_compatible (const bfd_target *input,
3285 const bfd_target *output)
3287 const struct elf_backend_data *obed, *ibed;
3289 if (input == output)
3292 ibed = xvec_get_elf_backend_data (input);
3293 obed = xvec_get_elf_backend_data (output);
3295 if (ibed->arch != obed->arch)
3298 /* If both backends are using this function, deem them compatible. */
3299 return ibed->relocs_compatible == obed->relocs_compatible;
3302 /* Make a special call to the linker "notice" function to tell it that
3303 we are about to handle an as-needed lib, or have finished
3304 processing the lib. */
3307 _bfd_elf_notice_as_needed (bfd *ibfd,
3308 struct bfd_link_info *info,
3309 enum notice_asneeded_action act)
3311 return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
3314 /* Add symbols from an ELF object file to the linker hash table. */
3317 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3319 Elf_Internal_Ehdr *ehdr;
3320 Elf_Internal_Shdr *hdr;
3321 bfd_size_type symcount;
3322 bfd_size_type extsymcount;
3323 bfd_size_type extsymoff;
3324 struct elf_link_hash_entry **sym_hash;
3325 bfd_boolean dynamic;
3326 Elf_External_Versym *extversym = NULL;
3327 Elf_External_Versym *ever;
3328 struct elf_link_hash_entry *weaks;
3329 struct elf_link_hash_entry **nondeflt_vers = NULL;
3330 bfd_size_type nondeflt_vers_cnt = 0;
3331 Elf_Internal_Sym *isymbuf = NULL;
3332 Elf_Internal_Sym *isym;
3333 Elf_Internal_Sym *isymend;
3334 const struct elf_backend_data *bed;
3335 bfd_boolean add_needed;
3336 struct elf_link_hash_table *htab;
3338 void *alloc_mark = NULL;
3339 struct bfd_hash_entry **old_table = NULL;
3340 unsigned int old_size = 0;
3341 unsigned int old_count = 0;
3342 void *old_tab = NULL;
3344 struct bfd_link_hash_entry *old_undefs = NULL;
3345 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3346 long old_dynsymcount = 0;
3347 bfd_size_type old_dynstr_size = 0;
3350 bfd_boolean just_syms;
3352 htab = elf_hash_table (info);
3353 bed = get_elf_backend_data (abfd);
3355 if ((abfd->flags & DYNAMIC) == 0)
3361 /* You can't use -r against a dynamic object. Also, there's no
3362 hope of using a dynamic object which does not exactly match
3363 the format of the output file. */
3364 if (info->relocatable
3365 || !is_elf_hash_table (htab)
3366 || info->output_bfd->xvec != abfd->xvec)
3368 if (info->relocatable)
3369 bfd_set_error (bfd_error_invalid_operation);
3371 bfd_set_error (bfd_error_wrong_format);
3376 ehdr = elf_elfheader (abfd);
3377 if (info->warn_alternate_em
3378 && bed->elf_machine_code != ehdr->e_machine
3379 && ((bed->elf_machine_alt1 != 0
3380 && ehdr->e_machine == bed->elf_machine_alt1)
3381 || (bed->elf_machine_alt2 != 0
3382 && ehdr->e_machine == bed->elf_machine_alt2)))
3383 info->callbacks->einfo
3384 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3385 ehdr->e_machine, abfd, bed->elf_machine_code);
3387 /* As a GNU extension, any input sections which are named
3388 .gnu.warning.SYMBOL are treated as warning symbols for the given
3389 symbol. This differs from .gnu.warning sections, which generate
3390 warnings when they are included in an output file. */
3391 /* PR 12761: Also generate this warning when building shared libraries. */
3392 for (s = abfd->sections; s != NULL; s = s->next)
3396 name = bfd_get_section_name (abfd, s);
3397 if (CONST_STRNEQ (name, ".gnu.warning."))
3402 name += sizeof ".gnu.warning." - 1;
3404 /* If this is a shared object, then look up the symbol
3405 in the hash table. If it is there, and it is already
3406 been defined, then we will not be using the entry
3407 from this shared object, so we don't need to warn.
3408 FIXME: If we see the definition in a regular object
3409 later on, we will warn, but we shouldn't. The only
3410 fix is to keep track of what warnings we are supposed
3411 to emit, and then handle them all at the end of the
3415 struct elf_link_hash_entry *h;
3417 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3419 /* FIXME: What about bfd_link_hash_common? */
3421 && (h->root.type == bfd_link_hash_defined
3422 || h->root.type == bfd_link_hash_defweak))
3427 msg = (char *) bfd_alloc (abfd, sz + 1);
3431 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3436 if (! (_bfd_generic_link_add_one_symbol
3437 (info, abfd, name, BSF_WARNING, s, 0, msg,
3438 FALSE, bed->collect, NULL)))
3441 if (!info->relocatable && info->executable)
3443 /* Clobber the section size so that the warning does
3444 not get copied into the output file. */
3447 /* Also set SEC_EXCLUDE, so that symbols defined in
3448 the warning section don't get copied to the output. */
3449 s->flags |= SEC_EXCLUDE;
3454 just_syms = ((s = abfd->sections) != NULL
3455 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);
3460 /* If we are creating a shared library, create all the dynamic
3461 sections immediately. We need to attach them to something,
3462 so we attach them to this BFD, provided it is the right
3463 format and is not from ld --just-symbols. FIXME: If there
3464 are no input BFD's of the same format as the output, we can't
3465 make a shared library. */
3468 && is_elf_hash_table (htab)
3469 && info->output_bfd->xvec == abfd->xvec
3470 && !htab->dynamic_sections_created)
3472 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3476 else if (!is_elf_hash_table (htab))
3480 const char *soname = NULL;
3482 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3485 /* ld --just-symbols and dynamic objects don't mix very well.
3486 ld shouldn't allow it. */
3490 /* If this dynamic lib was specified on the command line with
3491 --as-needed in effect, then we don't want to add a DT_NEEDED
3492 tag unless the lib is actually used. Similary for libs brought
3493 in by another lib's DT_NEEDED. When --no-add-needed is used
3494 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3495 any dynamic library in DT_NEEDED tags in the dynamic lib at
3497 add_needed = (elf_dyn_lib_class (abfd)
3498 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3499 | DYN_NO_NEEDED)) == 0;
3501 s = bfd_get_section_by_name (abfd, ".dynamic");
3506 unsigned int elfsec;
3507 unsigned long shlink;
3509 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3516 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3517 if (elfsec == SHN_BAD)
3518 goto error_free_dyn;
3519 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3521 for (extdyn = dynbuf;
3522 extdyn < dynbuf + s->size;
3523 extdyn += bed->s->sizeof_dyn)
3525 Elf_Internal_Dyn dyn;
3527 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3528 if (dyn.d_tag == DT_SONAME)
3530 unsigned int tagv = dyn.d_un.d_val;
3531 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3533 goto error_free_dyn;
3535 if (dyn.d_tag == DT_NEEDED)
3537 struct bfd_link_needed_list *n, **pn;
3539 unsigned int tagv = dyn.d_un.d_val;
3541 amt = sizeof (struct bfd_link_needed_list);
3542 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3543 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3544 if (n == NULL || fnm == NULL)
3545 goto error_free_dyn;
3546 amt = strlen (fnm) + 1;
3547 anm = (char *) bfd_alloc (abfd, amt);
3549 goto error_free_dyn;
3550 memcpy (anm, fnm, amt);
3554 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3558 if (dyn.d_tag == DT_RUNPATH)
3560 struct bfd_link_needed_list *n, **pn;
3562 unsigned int tagv = dyn.d_un.d_val;
3564 amt = sizeof (struct bfd_link_needed_list);
3565 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3566 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3567 if (n == NULL || fnm == NULL)
3568 goto error_free_dyn;
3569 amt = strlen (fnm) + 1;
3570 anm = (char *) bfd_alloc (abfd, amt);
3572 goto error_free_dyn;
3573 memcpy (anm, fnm, amt);
3577 for (pn = & runpath;
3583 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3584 if (!runpath && dyn.d_tag == DT_RPATH)
3586 struct bfd_link_needed_list *n, **pn;
3588 unsigned int tagv = dyn.d_un.d_val;
3590 amt = sizeof (struct bfd_link_needed_list);
3591 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3592 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3593 if (n == NULL || fnm == NULL)
3594 goto error_free_dyn;
3595 amt = strlen (fnm) + 1;
3596 anm = (char *) bfd_alloc (abfd, amt);
3598 goto error_free_dyn;
3599 memcpy (anm, fnm, amt);
3609 if (dyn.d_tag == DT_AUDIT)
3611 unsigned int tagv = dyn.d_un.d_val;
3612 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3619 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3620 frees all more recently bfd_alloc'd blocks as well. */
3626 struct bfd_link_needed_list **pn;
3627 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3632 /* We do not want to include any of the sections in a dynamic
3633 object in the output file. We hack by simply clobbering the
3634 list of sections in the BFD. This could be handled more
3635 cleanly by, say, a new section flag; the existing
3636 SEC_NEVER_LOAD flag is not the one we want, because that one
3637 still implies that the section takes up space in the output
3639 bfd_section_list_clear (abfd);
3641 /* Find the name to use in a DT_NEEDED entry that refers to this
3642 object. If the object has a DT_SONAME entry, we use it.
3643 Otherwise, if the generic linker stuck something in
3644 elf_dt_name, we use that. Otherwise, we just use the file
3646 if (soname == NULL || *soname == '\0')
3648 soname = elf_dt_name (abfd);
3649 if (soname == NULL || *soname == '\0')
3650 soname = bfd_get_filename (abfd);
3653 /* Save the SONAME because sometimes the linker emulation code
3654 will need to know it. */
3655 elf_dt_name (abfd) = soname;
3657 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3661 /* If we have already included this dynamic object in the
3662 link, just ignore it. There is no reason to include a
3663 particular dynamic object more than once. */
3667 /* Save the DT_AUDIT entry for the linker emulation code. */
3668 elf_dt_audit (abfd) = audit;
3671 /* If this is a dynamic object, we always link against the .dynsym
3672 symbol table, not the .symtab symbol table. The dynamic linker
3673 will only see the .dynsym symbol table, so there is no reason to
3674 look at .symtab for a dynamic object. */
3676 if (! dynamic || elf_dynsymtab (abfd) == 0)
3677 hdr = &elf_tdata (abfd)->symtab_hdr;
3679 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3681 symcount = hdr->sh_size / bed->s->sizeof_sym;
3683 /* The sh_info field of the symtab header tells us where the
3684 external symbols start. We don't care about the local symbols at
3686 if (elf_bad_symtab (abfd))
3688 extsymcount = symcount;
3693 extsymcount = symcount - hdr->sh_info;
3694 extsymoff = hdr->sh_info;
3697 sym_hash = elf_sym_hashes (abfd);
3698 if (extsymcount != 0)
3700 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3702 if (isymbuf == NULL)
3705 if (sym_hash == NULL)
3707 /* We store a pointer to the hash table entry for each
3709 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3710 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
3711 if (sym_hash == NULL)
3712 goto error_free_sym;
3713 elf_sym_hashes (abfd) = sym_hash;
3719 /* Read in any version definitions. */
3720 if (!_bfd_elf_slurp_version_tables (abfd,
3721 info->default_imported_symver))
3722 goto error_free_sym;
3724 /* Read in the symbol versions, but don't bother to convert them
3725 to internal format. */
3726 if (elf_dynversym (abfd) != 0)
3728 Elf_Internal_Shdr *versymhdr;
3730 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3731 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3732 if (extversym == NULL)
3733 goto error_free_sym;
3734 amt = versymhdr->sh_size;
3735 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3736 || bfd_bread (extversym, amt, abfd) != amt)
3737 goto error_free_vers;
3741 /* If we are loading an as-needed shared lib, save the symbol table
3742 state before we start adding symbols. If the lib turns out
3743 to be unneeded, restore the state. */
3744 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3749 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3751 struct bfd_hash_entry *p;
3752 struct elf_link_hash_entry *h;
3754 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3756 h = (struct elf_link_hash_entry *) p;
3757 entsize += htab->root.table.entsize;
3758 if (h->root.type == bfd_link_hash_warning)
3759 entsize += htab->root.table.entsize;
3763 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3764 old_tab = bfd_malloc (tabsize + entsize);
3765 if (old_tab == NULL)
3766 goto error_free_vers;
3768 /* Remember the current objalloc pointer, so that all mem for
3769 symbols added can later be reclaimed. */
3770 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3771 if (alloc_mark == NULL)
3772 goto error_free_vers;
3774 /* Make a special call to the linker "notice" function to
3775 tell it that we are about to handle an as-needed lib. */
3776 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
3777 goto error_free_vers;
3779 /* Clone the symbol table. Remember some pointers into the
3780 symbol table, and dynamic symbol count. */
3781 old_ent = (char *) old_tab + tabsize;
3782 memcpy (old_tab, htab->root.table.table, tabsize);
3783 old_undefs = htab->root.undefs;
3784 old_undefs_tail = htab->root.undefs_tail;
3785 old_table = htab->root.table.table;
3786 old_size = htab->root.table.size;
3787 old_count = htab->root.table.count;
3788 old_dynsymcount = htab->dynsymcount;
3789 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
3791 for (i = 0; i < htab->root.table.size; i++)
3793 struct bfd_hash_entry *p;
3794 struct elf_link_hash_entry *h;
3796 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3798 memcpy (old_ent, p, htab->root.table.entsize);
3799 old_ent = (char *) old_ent + htab->root.table.entsize;
3800 h = (struct elf_link_hash_entry *) p;
3801 if (h->root.type == bfd_link_hash_warning)
3803 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3804 old_ent = (char *) old_ent + htab->root.table.entsize;
3811 ever = extversym != NULL ? extversym + extsymoff : NULL;
3812 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3814 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3818 asection *sec, *new_sec;
3821 struct elf_link_hash_entry *h;
3822 struct elf_link_hash_entry *hi;
3823 bfd_boolean definition;
3824 bfd_boolean size_change_ok;
3825 bfd_boolean type_change_ok;
3826 bfd_boolean new_weakdef;
3827 bfd_boolean new_weak;
3828 bfd_boolean old_weak;
3829 bfd_boolean override;
3831 unsigned int old_alignment;
3836 flags = BSF_NO_FLAGS;
3838 value = isym->st_value;
3839 common = bed->common_definition (isym);
3841 bind = ELF_ST_BIND (isym->st_info);
3845 /* This should be impossible, since ELF requires that all
3846 global symbols follow all local symbols, and that sh_info
3847 point to the first global symbol. Unfortunately, Irix 5
3852 if (isym->st_shndx != SHN_UNDEF && !common)
3860 case STB_GNU_UNIQUE:
3861 flags = BSF_GNU_UNIQUE;
3865 /* Leave it up to the processor backend. */
3869 if (isym->st_shndx == SHN_UNDEF)
3870 sec = bfd_und_section_ptr;
3871 else if (isym->st_shndx == SHN_ABS)
3872 sec = bfd_abs_section_ptr;
3873 else if (isym->st_shndx == SHN_COMMON)
3875 sec = bfd_com_section_ptr;
3876 /* What ELF calls the size we call the value. What ELF
3877 calls the value we call the alignment. */
3878 value = isym->st_size;
3882 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3884 sec = bfd_abs_section_ptr;
3885 else if (discarded_section (sec))
3887 /* Symbols from discarded section are undefined. We keep
3889 sec = bfd_und_section_ptr;
3890 isym->st_shndx = SHN_UNDEF;
3892 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3896 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3899 goto error_free_vers;
3901 if (isym->st_shndx == SHN_COMMON
3902 && (abfd->flags & BFD_PLUGIN) != 0)
3904 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
3908 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
3910 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
3912 goto error_free_vers;
3916 else if (isym->st_shndx == SHN_COMMON
3917 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3918 && !info->relocatable)
3920 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3924 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
3925 | SEC_LINKER_CREATED);
3926 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
3928 goto error_free_vers;
3932 else if (bed->elf_add_symbol_hook)
3934 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3936 goto error_free_vers;
3938 /* The hook function sets the name to NULL if this symbol
3939 should be skipped for some reason. */
3944 /* Sanity check that all possibilities were handled. */
3947 bfd_set_error (bfd_error_bad_value);
3948 goto error_free_vers;
3951 /* Silently discard TLS symbols from --just-syms. There's
3952 no way to combine a static TLS block with a new TLS block
3953 for this executable. */
3954 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
3955 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3958 if (bfd_is_und_section (sec)
3959 || bfd_is_com_section (sec))
3964 size_change_ok = FALSE;
3965 type_change_ok = bed->type_change_ok;
3971 if (is_elf_hash_table (htab))
3973 Elf_Internal_Versym iver;
3974 unsigned int vernum = 0;
3979 if (info->default_imported_symver)
3980 /* Use the default symbol version created earlier. */
3981 iver.vs_vers = elf_tdata (abfd)->cverdefs;
3986 _bfd_elf_swap_versym_in (abfd, ever, &iver);
3988 vernum = iver.vs_vers & VERSYM_VERSION;
3990 /* If this is a hidden symbol, or if it is not version
3991 1, we append the version name to the symbol name.
3992 However, we do not modify a non-hidden absolute symbol
3993 if it is not a function, because it might be the version
3994 symbol itself. FIXME: What if it isn't? */
3995 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
3997 && (!bfd_is_abs_section (sec)
3998 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4001 size_t namelen, verlen, newlen;
4004 if (isym->st_shndx != SHN_UNDEF)
4006 if (vernum > elf_tdata (abfd)->cverdefs)
4008 else if (vernum > 1)
4010 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4016 (*_bfd_error_handler)
4017 (_("%B: %s: invalid version %u (max %d)"),
4019 elf_tdata (abfd)->cverdefs);
4020 bfd_set_error (bfd_error_bad_value);
4021 goto error_free_vers;
4026 /* We cannot simply test for the number of
4027 entries in the VERNEED section since the
4028 numbers for the needed versions do not start
4030 Elf_Internal_Verneed *t;
4033 for (t = elf_tdata (abfd)->verref;
4037 Elf_Internal_Vernaux *a;
4039 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4041 if (a->vna_other == vernum)
4043 verstr = a->vna_nodename;
4052 (*_bfd_error_handler)
4053 (_("%B: %s: invalid needed version %d"),
4054 abfd, name, vernum);
4055 bfd_set_error (bfd_error_bad_value);
4056 goto error_free_vers;
4060 namelen = strlen (name);
4061 verlen = strlen (verstr);
4062 newlen = namelen + verlen + 2;
4063 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4064 && isym->st_shndx != SHN_UNDEF)
4067 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4068 if (newname == NULL)
4069 goto error_free_vers;
4070 memcpy (newname, name, namelen);
4071 p = newname + namelen;
4073 /* If this is a defined non-hidden version symbol,
4074 we add another @ to the name. This indicates the
4075 default version of the symbol. */
4076 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4077 && isym->st_shndx != SHN_UNDEF)
4079 memcpy (p, verstr, verlen + 1);
4084 /* If this symbol has default visibility and the user has
4085 requested we not re-export it, then mark it as hidden. */
4089 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4090 isym->st_other = (STV_HIDDEN
4091 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4093 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4094 sym_hash, &old_bfd, &old_weak,
4095 &old_alignment, &skip, &override,
4096 &type_change_ok, &size_change_ok))
4097 goto error_free_vers;
4106 while (h->root.type == bfd_link_hash_indirect
4107 || h->root.type == bfd_link_hash_warning)
4108 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4110 if (elf_tdata (abfd)->verdef != NULL
4113 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4116 if (! (_bfd_generic_link_add_one_symbol
4117 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4118 (struct bfd_link_hash_entry **) sym_hash)))
4119 goto error_free_vers;
4122 /* We need to make sure that indirect symbol dynamic flags are
4125 while (h->root.type == bfd_link_hash_indirect
4126 || h->root.type == bfd_link_hash_warning)
4127 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4131 new_weak = (flags & BSF_WEAK) != 0;
4132 new_weakdef = FALSE;
4136 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4137 && is_elf_hash_table (htab)
4138 && h->u.weakdef == NULL)
4140 /* Keep a list of all weak defined non function symbols from
4141 a dynamic object, using the weakdef field. Later in this
4142 function we will set the weakdef field to the correct
4143 value. We only put non-function symbols from dynamic
4144 objects on this list, because that happens to be the only
4145 time we need to know the normal symbol corresponding to a
4146 weak symbol, and the information is time consuming to
4147 figure out. If the weakdef field is not already NULL,
4148 then this symbol was already defined by some previous
4149 dynamic object, and we will be using that previous
4150 definition anyhow. */
4152 h->u.weakdef = weaks;
4157 /* Set the alignment of a common symbol. */
4158 if ((common || bfd_is_com_section (sec))
4159 && h->root.type == bfd_link_hash_common)
4164 align = bfd_log2 (isym->st_value);
4167 /* The new symbol is a common symbol in a shared object.
4168 We need to get the alignment from the section. */
4169 align = new_sec->alignment_power;
4171 if (align > old_alignment)
4172 h->root.u.c.p->alignment_power = align;
4174 h->root.u.c.p->alignment_power = old_alignment;
4177 if (is_elf_hash_table (htab))
4179 /* Set a flag in the hash table entry indicating the type of
4180 reference or definition we just found. A dynamic symbol
4181 is one which is referenced or defined by both a regular
4182 object and a shared object. */
4183 bfd_boolean dynsym = FALSE;
4185 /* Plugin symbols aren't normal. Don't set def_regular or
4186 ref_regular for them, or make them dynamic. */
4187 if ((abfd->flags & BFD_PLUGIN) != 0)
4194 if (bind != STB_WEAK)
4195 h->ref_regular_nonweak = 1;
4207 /* If the indirect symbol has been forced local, don't
4208 make the real symbol dynamic. */
4209 if ((h == hi || !hi->forced_local)
4210 && (! info->executable
4220 hi->ref_dynamic = 1;
4225 hi->def_dynamic = 1;
4228 /* If the indirect symbol has been forced local, don't
4229 make the real symbol dynamic. */
4230 if ((h == hi || !hi->forced_local)
4233 || (h->u.weakdef != NULL
4235 && h->u.weakdef->dynindx != -1)))
4239 /* Check to see if we need to add an indirect symbol for
4240 the default name. */
4242 || (!override && h->root.type == bfd_link_hash_common))
4243 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4244 sec, value, &old_bfd, &dynsym))
4245 goto error_free_vers;
4247 /* Check the alignment when a common symbol is involved. This
4248 can change when a common symbol is overridden by a normal
4249 definition or a common symbol is ignored due to the old
4250 normal definition. We need to make sure the maximum
4251 alignment is maintained. */
4252 if ((old_alignment || common)
4253 && h->root.type != bfd_link_hash_common)
4255 unsigned int common_align;
4256 unsigned int normal_align;
4257 unsigned int symbol_align;
4261 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4262 || h->root.type == bfd_link_hash_defweak);
4264 symbol_align = ffs (h->root.u.def.value) - 1;
4265 if (h->root.u.def.section->owner != NULL
4266 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4268 normal_align = h->root.u.def.section->alignment_power;
4269 if (normal_align > symbol_align)
4270 normal_align = symbol_align;
4273 normal_align = symbol_align;
4277 common_align = old_alignment;
4278 common_bfd = old_bfd;
4283 common_align = bfd_log2 (isym->st_value);
4285 normal_bfd = old_bfd;
4288 if (normal_align < common_align)
4290 /* PR binutils/2735 */
4291 if (normal_bfd == NULL)
4292 (*_bfd_error_handler)
4293 (_("Warning: alignment %u of common symbol `%s' in %B is"
4294 " greater than the alignment (%u) of its section %A"),
4295 common_bfd, h->root.u.def.section,
4296 1 << common_align, name, 1 << normal_align);
4298 (*_bfd_error_handler)
4299 (_("Warning: alignment %u of symbol `%s' in %B"
4300 " is smaller than %u in %B"),
4301 normal_bfd, common_bfd,
4302 1 << normal_align, name, 1 << common_align);
4306 /* Remember the symbol size if it isn't undefined. */
4307 if (isym->st_size != 0
4308 && isym->st_shndx != SHN_UNDEF
4309 && (definition || h->size == 0))
4312 && h->size != isym->st_size
4313 && ! size_change_ok)
4314 (*_bfd_error_handler)
4315 (_("Warning: size of symbol `%s' changed"
4316 " from %lu in %B to %lu in %B"),
4318 name, (unsigned long) h->size,
4319 (unsigned long) isym->st_size);
4321 h->size = isym->st_size;
4324 /* If this is a common symbol, then we always want H->SIZE
4325 to be the size of the common symbol. The code just above
4326 won't fix the size if a common symbol becomes larger. We
4327 don't warn about a size change here, because that is
4328 covered by --warn-common. Allow changes between different
4330 if (h->root.type == bfd_link_hash_common)
4331 h->size = h->root.u.c.size;
4333 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4334 && ((definition && !new_weak)
4335 || (old_weak && h->root.type == bfd_link_hash_common)
4336 || h->type == STT_NOTYPE))
4338 unsigned int type = ELF_ST_TYPE (isym->st_info);
4340 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4342 if (type == STT_GNU_IFUNC
4343 && (abfd->flags & DYNAMIC) != 0)
4346 if (h->type != type)
4348 if (h->type != STT_NOTYPE && ! type_change_ok)
4349 (*_bfd_error_handler)
4350 (_("Warning: type of symbol `%s' changed"
4351 " from %d to %d in %B"),
4352 abfd, name, h->type, type);
4358 /* Merge st_other field. */
4359 elf_merge_st_other (abfd, h, isym, sec, definition, dynamic);
4361 /* We don't want to make debug symbol dynamic. */
4362 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4365 /* Nor should we make plugin symbols dynamic. */
4366 if ((abfd->flags & BFD_PLUGIN) != 0)
4371 h->target_internal = isym->st_target_internal;
4372 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4375 if (definition && !dynamic)
4377 char *p = strchr (name, ELF_VER_CHR);
4378 if (p != NULL && p[1] != ELF_VER_CHR)
4380 /* Queue non-default versions so that .symver x, x@FOO
4381 aliases can be checked. */
4384 amt = ((isymend - isym + 1)
4385 * sizeof (struct elf_link_hash_entry *));
4387 = (struct elf_link_hash_entry **) bfd_malloc (amt);
4389 goto error_free_vers;
4391 nondeflt_vers[nondeflt_vers_cnt++] = h;
4395 if (dynsym && h->dynindx == -1)
4397 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4398 goto error_free_vers;
4399 if (h->u.weakdef != NULL
4401 && h->u.weakdef->dynindx == -1)
4403 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4404 goto error_free_vers;
4407 else if (dynsym && h->dynindx != -1)
4408 /* If the symbol already has a dynamic index, but
4409 visibility says it should not be visible, turn it into
4411 switch (ELF_ST_VISIBILITY (h->other))
4415 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4420 /* Don't add DT_NEEDED for references from the dummy bfd. */
4424 && h->ref_regular_nonweak
4426 || (old_bfd->flags & BFD_PLUGIN) == 0))
4427 || (h->ref_dynamic_nonweak
4428 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4429 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4432 const char *soname = elf_dt_name (abfd);
4434 info->callbacks->minfo ("%!", soname, old_bfd,
4435 h->root.root.string);
4437 /* A symbol from a library loaded via DT_NEEDED of some
4438 other library is referenced by a regular object.
4439 Add a DT_NEEDED entry for it. Issue an error if
4440 --no-add-needed is used and the reference was not
4443 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4445 (*_bfd_error_handler)
4446 (_("%B: undefined reference to symbol '%s'"),
4448 bfd_set_error (bfd_error_missing_dso);
4449 goto error_free_vers;
4452 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4453 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4456 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4458 goto error_free_vers;
4460 BFD_ASSERT (ret == 0);
4465 if (extversym != NULL)
4471 if (isymbuf != NULL)
4477 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4481 /* Restore the symbol table. */
4482 old_ent = (char *) old_tab + tabsize;
4483 memset (elf_sym_hashes (abfd), 0,
4484 extsymcount * sizeof (struct elf_link_hash_entry *));
4485 htab->root.table.table = old_table;
4486 htab->root.table.size = old_size;
4487 htab->root.table.count = old_count;
4488 memcpy (htab->root.table.table, old_tab, tabsize);
4489 htab->root.undefs = old_undefs;
4490 htab->root.undefs_tail = old_undefs_tail;
4491 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4492 for (i = 0; i < htab->root.table.size; i++)
4494 struct bfd_hash_entry *p;
4495 struct elf_link_hash_entry *h;
4497 unsigned int alignment_power;
4499 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4501 h = (struct elf_link_hash_entry *) p;
4502 if (h->root.type == bfd_link_hash_warning)
4503 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4504 if (h->dynindx >= old_dynsymcount
4505 && h->dynstr_index < old_dynstr_size)
4506 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4508 /* Preserve the maximum alignment and size for common
4509 symbols even if this dynamic lib isn't on DT_NEEDED
4510 since it can still be loaded at run time by another
4512 if (h->root.type == bfd_link_hash_common)
4514 size = h->root.u.c.size;
4515 alignment_power = h->root.u.c.p->alignment_power;
4520 alignment_power = 0;
4522 memcpy (p, old_ent, htab->root.table.entsize);
4523 old_ent = (char *) old_ent + htab->root.table.entsize;
4524 h = (struct elf_link_hash_entry *) p;
4525 if (h->root.type == bfd_link_hash_warning)
4527 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4528 old_ent = (char *) old_ent + htab->root.table.entsize;
4529 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4531 if (h->root.type == bfd_link_hash_common)
4533 if (size > h->root.u.c.size)
4534 h->root.u.c.size = size;
4535 if (alignment_power > h->root.u.c.p->alignment_power)
4536 h->root.u.c.p->alignment_power = alignment_power;
4541 /* Make a special call to the linker "notice" function to
4542 tell it that symbols added for crefs may need to be removed. */
4543 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4544 goto error_free_vers;
4547 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4549 if (nondeflt_vers != NULL)
4550 free (nondeflt_vers);
4554 if (old_tab != NULL)
4556 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4557 goto error_free_vers;
4562 /* Now that all the symbols from this input file are created, handle
4563 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4564 if (nondeflt_vers != NULL)
4566 bfd_size_type cnt, symidx;
4568 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4570 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4571 char *shortname, *p;
4573 p = strchr (h->root.root.string, ELF_VER_CHR);
4575 || (h->root.type != bfd_link_hash_defined
4576 && h->root.type != bfd_link_hash_defweak))
4579 amt = p - h->root.root.string;
4580 shortname = (char *) bfd_malloc (amt + 1);
4582 goto error_free_vers;
4583 memcpy (shortname, h->root.root.string, amt);
4584 shortname[amt] = '\0';
4586 hi = (struct elf_link_hash_entry *)
4587 bfd_link_hash_lookup (&htab->root, shortname,
4588 FALSE, FALSE, FALSE);
4590 && hi->root.type == h->root.type
4591 && hi->root.u.def.value == h->root.u.def.value
4592 && hi->root.u.def.section == h->root.u.def.section)
4594 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4595 hi->root.type = bfd_link_hash_indirect;
4596 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4597 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4598 sym_hash = elf_sym_hashes (abfd);
4600 for (symidx = 0; symidx < extsymcount; ++symidx)
4601 if (sym_hash[symidx] == hi)
4603 sym_hash[symidx] = h;
4609 free (nondeflt_vers);
4610 nondeflt_vers = NULL;
4613 /* Now set the weakdefs field correctly for all the weak defined
4614 symbols we found. The only way to do this is to search all the
4615 symbols. Since we only need the information for non functions in
4616 dynamic objects, that's the only time we actually put anything on
4617 the list WEAKS. We need this information so that if a regular
4618 object refers to a symbol defined weakly in a dynamic object, the
4619 real symbol in the dynamic object is also put in the dynamic
4620 symbols; we also must arrange for both symbols to point to the
4621 same memory location. We could handle the general case of symbol
4622 aliasing, but a general symbol alias can only be generated in
4623 assembler code, handling it correctly would be very time
4624 consuming, and other ELF linkers don't handle general aliasing
4628 struct elf_link_hash_entry **hpp;
4629 struct elf_link_hash_entry **hppend;
4630 struct elf_link_hash_entry **sorted_sym_hash;
4631 struct elf_link_hash_entry *h;
4634 /* Since we have to search the whole symbol list for each weak
4635 defined symbol, search time for N weak defined symbols will be
4636 O(N^2). Binary search will cut it down to O(NlogN). */
4637 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4638 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4639 if (sorted_sym_hash == NULL)
4641 sym_hash = sorted_sym_hash;
4642 hpp = elf_sym_hashes (abfd);
4643 hppend = hpp + extsymcount;
4645 for (; hpp < hppend; hpp++)
4649 && h->root.type == bfd_link_hash_defined
4650 && !bed->is_function_type (h->type))
4658 qsort (sorted_sym_hash, sym_count,
4659 sizeof (struct elf_link_hash_entry *),
4662 while (weaks != NULL)
4664 struct elf_link_hash_entry *hlook;
4667 size_t i, j, idx = 0;
4670 weaks = hlook->u.weakdef;
4671 hlook->u.weakdef = NULL;
4673 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4674 || hlook->root.type == bfd_link_hash_defweak
4675 || hlook->root.type == bfd_link_hash_common
4676 || hlook->root.type == bfd_link_hash_indirect);
4677 slook = hlook->root.u.def.section;
4678 vlook = hlook->root.u.def.value;
4684 bfd_signed_vma vdiff;
4686 h = sorted_sym_hash[idx];
4687 vdiff = vlook - h->root.u.def.value;
4694 long sdiff = slook->id - h->root.u.def.section->id;
4704 /* We didn't find a value/section match. */
4708 /* With multiple aliases, or when the weak symbol is already
4709 strongly defined, we have multiple matching symbols and
4710 the binary search above may land on any of them. Step
4711 one past the matching symbol(s). */
4714 h = sorted_sym_hash[idx];
4715 if (h->root.u.def.section != slook
4716 || h->root.u.def.value != vlook)
4720 /* Now look back over the aliases. Since we sorted by size
4721 as well as value and section, we'll choose the one with
4722 the largest size. */
4725 h = sorted_sym_hash[idx];
4727 /* Stop if value or section doesn't match. */
4728 if (h->root.u.def.section != slook
4729 || h->root.u.def.value != vlook)
4731 else if (h != hlook)
4733 hlook->u.weakdef = h;
4735 /* If the weak definition is in the list of dynamic
4736 symbols, make sure the real definition is put
4738 if (hlook->dynindx != -1 && h->dynindx == -1)
4740 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4743 free (sorted_sym_hash);
4748 /* If the real definition is in the list of dynamic
4749 symbols, make sure the weak definition is put
4750 there as well. If we don't do this, then the
4751 dynamic loader might not merge the entries for the
4752 real definition and the weak definition. */
4753 if (h->dynindx != -1 && hlook->dynindx == -1)
4755 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4756 goto err_free_sym_hash;
4763 free (sorted_sym_hash);
4766 if (bed->check_directives
4767 && !(*bed->check_directives) (abfd, info))
4770 /* If this object is the same format as the output object, and it is
4771 not a shared library, then let the backend look through the
4774 This is required to build global offset table entries and to
4775 arrange for dynamic relocs. It is not required for the
4776 particular common case of linking non PIC code, even when linking
4777 against shared libraries, but unfortunately there is no way of
4778 knowing whether an object file has been compiled PIC or not.
4779 Looking through the relocs is not particularly time consuming.
4780 The problem is that we must either (1) keep the relocs in memory,
4781 which causes the linker to require additional runtime memory or
4782 (2) read the relocs twice from the input file, which wastes time.
4783 This would be a good case for using mmap.
4785 I have no idea how to handle linking PIC code into a file of a
4786 different format. It probably can't be done. */
4788 && is_elf_hash_table (htab)
4789 && bed->check_relocs != NULL
4790 && elf_object_id (abfd) == elf_hash_table_id (htab)
4791 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4795 for (o = abfd->sections; o != NULL; o = o->next)
4797 Elf_Internal_Rela *internal_relocs;
4800 if ((o->flags & SEC_RELOC) == 0
4801 || o->reloc_count == 0
4802 || ((info->strip == strip_all || info->strip == strip_debugger)
4803 && (o->flags & SEC_DEBUGGING) != 0)
4804 || bfd_is_abs_section (o->output_section))
4807 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4809 if (internal_relocs == NULL)
4812 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4814 if (elf_section_data (o)->relocs != internal_relocs)
4815 free (internal_relocs);
4822 /* If this is a non-traditional link, try to optimize the handling
4823 of the .stab/.stabstr sections. */
4825 && ! info->traditional_format
4826 && is_elf_hash_table (htab)
4827 && (info->strip != strip_all && info->strip != strip_debugger))
4831 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4832 if (stabstr != NULL)
4834 bfd_size_type string_offset = 0;
4837 for (stab = abfd->sections; stab; stab = stab->next)
4838 if (CONST_STRNEQ (stab->name, ".stab")
4839 && (!stab->name[5] ||
4840 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4841 && (stab->flags & SEC_MERGE) == 0
4842 && !bfd_is_abs_section (stab->output_section))
4844 struct bfd_elf_section_data *secdata;
4846 secdata = elf_section_data (stab);
4847 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4848 stabstr, &secdata->sec_info,
4851 if (secdata->sec_info)
4852 stab->sec_info_type = SEC_INFO_TYPE_STABS;
4857 if (is_elf_hash_table (htab) && add_needed)
4859 /* Add this bfd to the loaded list. */
4860 struct elf_link_loaded_list *n;
4862 n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n));
4866 n->next = htab->loaded;
4873 if (old_tab != NULL)
4875 if (nondeflt_vers != NULL)
4876 free (nondeflt_vers);
4877 if (extversym != NULL)
4880 if (isymbuf != NULL)
4886 /* Return the linker hash table entry of a symbol that might be
4887 satisfied by an archive symbol. Return -1 on error. */
4889 struct elf_link_hash_entry *
4890 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4891 struct bfd_link_info *info,
4894 struct elf_link_hash_entry *h;
4898 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
4902 /* If this is a default version (the name contains @@), look up the
4903 symbol again with only one `@' as well as without the version.
4904 The effect is that references to the symbol with and without the
4905 version will be matched by the default symbol in the archive. */
4907 p = strchr (name, ELF_VER_CHR);
4908 if (p == NULL || p[1] != ELF_VER_CHR)
4911 /* First check with only one `@'. */
4912 len = strlen (name);
4913 copy = (char *) bfd_alloc (abfd, len);
4915 return (struct elf_link_hash_entry *) 0 - 1;
4917 first = p - name + 1;
4918 memcpy (copy, name, first);
4919 memcpy (copy + first, name + first + 1, len - first);
4921 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
4924 /* We also need to check references to the symbol without the
4926 copy[first - 1] = '\0';
4927 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4928 FALSE, FALSE, TRUE);
4931 bfd_release (abfd, copy);
4935 /* Add symbols from an ELF archive file to the linker hash table. We
4936 don't use _bfd_generic_link_add_archive_symbols because we need to
4937 handle versioned symbols.
4939 Fortunately, ELF archive handling is simpler than that done by
4940 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4941 oddities. In ELF, if we find a symbol in the archive map, and the
4942 symbol is currently undefined, we know that we must pull in that
4945 Unfortunately, we do have to make multiple passes over the symbol
4946 table until nothing further is resolved. */
4949 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4952 unsigned char *included = NULL;
4956 const struct elf_backend_data *bed;
4957 struct elf_link_hash_entry * (*archive_symbol_lookup)
4958 (bfd *, struct bfd_link_info *, const char *);
4960 if (! bfd_has_map (abfd))
4962 /* An empty archive is a special case. */
4963 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4965 bfd_set_error (bfd_error_no_armap);
4969 /* Keep track of all symbols we know to be already defined, and all
4970 files we know to be already included. This is to speed up the
4971 second and subsequent passes. */
4972 c = bfd_ardata (abfd)->symdef_count;
4976 amt *= sizeof (*included);
4977 included = (unsigned char *) bfd_zmalloc (amt);
4978 if (included == NULL)
4981 symdefs = bfd_ardata (abfd)->symdefs;
4982 bed = get_elf_backend_data (abfd);
4983 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
4996 symdefend = symdef + c;
4997 for (i = 0; symdef < symdefend; symdef++, i++)
4999 struct elf_link_hash_entry *h;
5001 struct bfd_link_hash_entry *undefs_tail;
5006 if (symdef->file_offset == last)
5012 h = archive_symbol_lookup (abfd, info, symdef->name);
5013 if (h == (struct elf_link_hash_entry *) 0 - 1)
5019 if (h->root.type == bfd_link_hash_common)
5021 /* We currently have a common symbol. The archive map contains
5022 a reference to this symbol, so we may want to include it. We
5023 only want to include it however, if this archive element
5024 contains a definition of the symbol, not just another common
5027 Unfortunately some archivers (including GNU ar) will put
5028 declarations of common symbols into their archive maps, as
5029 well as real definitions, so we cannot just go by the archive
5030 map alone. Instead we must read in the element's symbol
5031 table and check that to see what kind of symbol definition
5033 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5036 else if (h->root.type != bfd_link_hash_undefined)
5038 if (h->root.type != bfd_link_hash_undefweak)
5039 /* Symbol must be defined. Don't check it again. */
5044 /* We need to include this archive member. */
5045 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5046 if (element == NULL)
5049 if (! bfd_check_format (element, bfd_object))
5052 undefs_tail = info->hash->undefs_tail;
5054 if (!(*info->callbacks
5055 ->add_archive_element) (info, element, symdef->name, &element))
5057 if (!bfd_link_add_symbols (element, info))
5060 /* If there are any new undefined symbols, we need to make
5061 another pass through the archive in order to see whether
5062 they can be defined. FIXME: This isn't perfect, because
5063 common symbols wind up on undefs_tail and because an
5064 undefined symbol which is defined later on in this pass
5065 does not require another pass. This isn't a bug, but it
5066 does make the code less efficient than it could be. */
5067 if (undefs_tail != info->hash->undefs_tail)
5070 /* Look backward to mark all symbols from this object file
5071 which we have already seen in this pass. */
5075 included[mark] = TRUE;
5080 while (symdefs[mark].file_offset == symdef->file_offset);
5082 /* We mark subsequent symbols from this object file as we go
5083 on through the loop. */
5084 last = symdef->file_offset;
5094 if (included != NULL)
5099 /* Given an ELF BFD, add symbols to the global hash table as
5103 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5105 switch (bfd_get_format (abfd))
5108 return elf_link_add_object_symbols (abfd, info);
5110 return elf_link_add_archive_symbols (abfd, info);
5112 bfd_set_error (bfd_error_wrong_format);
5117 struct hash_codes_info
5119 unsigned long *hashcodes;
5123 /* This function will be called though elf_link_hash_traverse to store
5124 all hash value of the exported symbols in an array. */
5127 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5129 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5135 /* Ignore indirect symbols. These are added by the versioning code. */
5136 if (h->dynindx == -1)
5139 name = h->root.root.string;
5140 p = strchr (name, ELF_VER_CHR);
5143 alc = (char *) bfd_malloc (p - name + 1);
5149 memcpy (alc, name, p - name);
5150 alc[p - name] = '\0';
5154 /* Compute the hash value. */
5155 ha = bfd_elf_hash (name);
5157 /* Store the found hash value in the array given as the argument. */
5158 *(inf->hashcodes)++ = ha;
5160 /* And store it in the struct so that we can put it in the hash table
5162 h->u.elf_hash_value = ha;
5170 struct collect_gnu_hash_codes
5173 const struct elf_backend_data *bed;
5174 unsigned long int nsyms;
5175 unsigned long int maskbits;
5176 unsigned long int *hashcodes;
5177 unsigned long int *hashval;
5178 unsigned long int *indx;
5179 unsigned long int *counts;
5182 long int min_dynindx;
5183 unsigned long int bucketcount;
5184 unsigned long int symindx;
5185 long int local_indx;
5186 long int shift1, shift2;
5187 unsigned long int mask;
5191 /* This function will be called though elf_link_hash_traverse to store
5192 all hash value of the exported symbols in an array. */
5195 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5197 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5203 /* Ignore indirect symbols. These are added by the versioning code. */
5204 if (h->dynindx == -1)
5207 /* Ignore also local symbols and undefined symbols. */
5208 if (! (*s->bed->elf_hash_symbol) (h))
5211 name = h->root.root.string;
5212 p = strchr (name, ELF_VER_CHR);
5215 alc = (char *) bfd_malloc (p - name + 1);
5221 memcpy (alc, name, p - name);
5222 alc[p - name] = '\0';
5226 /* Compute the hash value. */
5227 ha = bfd_elf_gnu_hash (name);
5229 /* Store the found hash value in the array for compute_bucket_count,
5230 and also for .dynsym reordering purposes. */
5231 s->hashcodes[s->nsyms] = ha;
5232 s->hashval[h->dynindx] = ha;
5234 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5235 s->min_dynindx = h->dynindx;
5243 /* This function will be called though elf_link_hash_traverse to do
5244 final dynaminc symbol renumbering. */
5247 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5249 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5250 unsigned long int bucket;
5251 unsigned long int val;
5253 /* Ignore indirect symbols. */
5254 if (h->dynindx == -1)
5257 /* Ignore also local symbols and undefined symbols. */
5258 if (! (*s->bed->elf_hash_symbol) (h))
5260 if (h->dynindx >= s->min_dynindx)
5261 h->dynindx = s->local_indx++;
5265 bucket = s->hashval[h->dynindx] % s->bucketcount;
5266 val = (s->hashval[h->dynindx] >> s->shift1)
5267 & ((s->maskbits >> s->shift1) - 1);
5268 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5270 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5271 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5272 if (s->counts[bucket] == 1)
5273 /* Last element terminates the chain. */
5275 bfd_put_32 (s->output_bfd, val,
5276 s->contents + (s->indx[bucket] - s->symindx) * 4);
5277 --s->counts[bucket];
5278 h->dynindx = s->indx[bucket]++;
5282 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5285 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5287 return !(h->forced_local
5288 || h->root.type == bfd_link_hash_undefined
5289 || h->root.type == bfd_link_hash_undefweak
5290 || ((h->root.type == bfd_link_hash_defined
5291 || h->root.type == bfd_link_hash_defweak)
5292 && h->root.u.def.section->output_section == NULL));
5295 /* Array used to determine the number of hash table buckets to use
5296 based on the number of symbols there are. If there are fewer than
5297 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5298 fewer than 37 we use 17 buckets, and so forth. We never use more
5299 than 32771 buckets. */
5301 static const size_t elf_buckets[] =
5303 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5307 /* Compute bucket count for hashing table. We do not use a static set
5308 of possible tables sizes anymore. Instead we determine for all
5309 possible reasonable sizes of the table the outcome (i.e., the
5310 number of collisions etc) and choose the best solution. The
5311 weighting functions are not too simple to allow the table to grow
5312 without bounds. Instead one of the weighting factors is the size.
5313 Therefore the result is always a good payoff between few collisions
5314 (= short chain lengths) and table size. */
5316 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5317 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5318 unsigned long int nsyms,
5321 size_t best_size = 0;
5322 unsigned long int i;
5324 /* We have a problem here. The following code to optimize the table
5325 size requires an integer type with more the 32 bits. If
5326 BFD_HOST_U_64_BIT is set we know about such a type. */
5327 #ifdef BFD_HOST_U_64_BIT
5332 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5333 bfd *dynobj = elf_hash_table (info)->dynobj;
5334 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5335 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5336 unsigned long int *counts;
5338 unsigned int no_improvement_count = 0;
5340 /* Possible optimization parameters: if we have NSYMS symbols we say
5341 that the hashing table must at least have NSYMS/4 and at most
5343 minsize = nsyms / 4;
5346 best_size = maxsize = nsyms * 2;
5351 if ((best_size & 31) == 0)
5355 /* Create array where we count the collisions in. We must use bfd_malloc
5356 since the size could be large. */
5358 amt *= sizeof (unsigned long int);
5359 counts = (unsigned long int *) bfd_malloc (amt);
5363 /* Compute the "optimal" size for the hash table. The criteria is a
5364 minimal chain length. The minor criteria is (of course) the size
5366 for (i = minsize; i < maxsize; ++i)
5368 /* Walk through the array of hashcodes and count the collisions. */
5369 BFD_HOST_U_64_BIT max;
5370 unsigned long int j;
5371 unsigned long int fact;
5373 if (gnu_hash && (i & 31) == 0)
5376 memset (counts, '\0', i * sizeof (unsigned long int));
5378 /* Determine how often each hash bucket is used. */
5379 for (j = 0; j < nsyms; ++j)
5380 ++counts[hashcodes[j] % i];
5382 /* For the weight function we need some information about the
5383 pagesize on the target. This is information need not be 100%
5384 accurate. Since this information is not available (so far) we
5385 define it here to a reasonable default value. If it is crucial
5386 to have a better value some day simply define this value. */
5387 # ifndef BFD_TARGET_PAGESIZE
5388 # define BFD_TARGET_PAGESIZE (4096)
5391 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5393 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5396 /* Variant 1: optimize for short chains. We add the squares
5397 of all the chain lengths (which favors many small chain
5398 over a few long chains). */
5399 for (j = 0; j < i; ++j)
5400 max += counts[j] * counts[j];
5402 /* This adds penalties for the overall size of the table. */
5403 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5406 /* Variant 2: Optimize a lot more for small table. Here we
5407 also add squares of the size but we also add penalties for
5408 empty slots (the +1 term). */
5409 for (j = 0; j < i; ++j)
5410 max += (1 + counts[j]) * (1 + counts[j]);
5412 /* The overall size of the table is considered, but not as
5413 strong as in variant 1, where it is squared. */
5414 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5418 /* Compare with current best results. */
5419 if (max < best_chlen)
5423 no_improvement_count = 0;
5425 /* PR 11843: Avoid futile long searches for the best bucket size
5426 when there are a large number of symbols. */
5427 else if (++no_improvement_count == 100)
5434 #endif /* defined (BFD_HOST_U_64_BIT) */
5436 /* This is the fallback solution if no 64bit type is available or if we
5437 are not supposed to spend much time on optimizations. We select the
5438 bucket count using a fixed set of numbers. */
5439 for (i = 0; elf_buckets[i] != 0; i++)
5441 best_size = elf_buckets[i];
5442 if (nsyms < elf_buckets[i + 1])
5445 if (gnu_hash && best_size < 2)
5452 /* Size any SHT_GROUP section for ld -r. */
5455 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5459 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5460 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5461 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5466 /* Set a default stack segment size. The value in INFO wins. If it
5467 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5468 undefined it is initialized. */
5471 bfd_elf_stack_segment_size (bfd *output_bfd,
5472 struct bfd_link_info *info,
5473 const char *legacy_symbol,
5474 bfd_vma default_size)
5476 struct elf_link_hash_entry *h = NULL;
5478 /* Look for legacy symbol. */
5480 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5481 FALSE, FALSE, FALSE);
5482 if (h && (h->root.type == bfd_link_hash_defined
5483 || h->root.type == bfd_link_hash_defweak)
5485 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5487 /* The symbol has no type if specified on the command line. */
5488 h->type = STT_OBJECT;
5489 if (info->stacksize)
5490 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5491 output_bfd, legacy_symbol);
5492 else if (h->root.u.def.section != bfd_abs_section_ptr)
5493 (*_bfd_error_handler) (_("%B: %s not absolute"),
5494 output_bfd, legacy_symbol);
5496 info->stacksize = h->root.u.def.value;
5499 if (!info->stacksize)
5500 /* If the user didn't set a size, or explicitly inhibit the
5501 size, set it now. */
5502 info->stacksize = default_size;
5504 /* Provide the legacy symbol, if it is referenced. */
5505 if (h && (h->root.type == bfd_link_hash_undefined
5506 || h->root.type == bfd_link_hash_undefweak))
5508 struct bfd_link_hash_entry *bh = NULL;
5510 if (!(_bfd_generic_link_add_one_symbol
5511 (info, output_bfd, legacy_symbol,
5512 BSF_GLOBAL, bfd_abs_section_ptr,
5513 info->stacksize >= 0 ? info->stacksize : 0,
5514 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5517 h = (struct elf_link_hash_entry *) bh;
5519 h->type = STT_OBJECT;
5525 /* Set up the sizes and contents of the ELF dynamic sections. This is
5526 called by the ELF linker emulation before_allocation routine. We
5527 must set the sizes of the sections before the linker sets the
5528 addresses of the various sections. */
5531 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5534 const char *filter_shlib,
5536 const char *depaudit,
5537 const char * const *auxiliary_filters,
5538 struct bfd_link_info *info,
5539 asection **sinterpptr)
5541 bfd_size_type soname_indx;
5543 const struct elf_backend_data *bed;
5544 struct elf_info_failed asvinfo;
5548 soname_indx = (bfd_size_type) -1;
5550 if (!is_elf_hash_table (info->hash))
5553 bed = get_elf_backend_data (output_bfd);
5555 /* Any syms created from now on start with -1 in
5556 got.refcount/offset and plt.refcount/offset. */
5557 elf_hash_table (info)->init_got_refcount
5558 = elf_hash_table (info)->init_got_offset;
5559 elf_hash_table (info)->init_plt_refcount
5560 = elf_hash_table (info)->init_plt_offset;
5562 if (info->relocatable
5563 && !_bfd_elf_size_group_sections (info))
5566 /* The backend may have to create some sections regardless of whether
5567 we're dynamic or not. */
5568 if (bed->elf_backend_always_size_sections
5569 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5572 /* Determine any GNU_STACK segment requirements, after the backend
5573 has had a chance to set a default segment size. */
5574 if (info->execstack)
5575 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5576 else if (info->noexecstack)
5577 elf_stack_flags (output_bfd) = PF_R | PF_W;
5581 asection *notesec = NULL;
5584 for (inputobj = info->input_bfds;
5586 inputobj = inputobj->link.next)
5591 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5593 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5596 if (s->flags & SEC_CODE)
5600 else if (bed->default_execstack)
5603 if (notesec || info->stacksize > 0)
5604 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5605 if (notesec && exec && info->relocatable
5606 && notesec->output_section != bfd_abs_section_ptr)
5607 notesec->output_section->flags |= SEC_CODE;
5610 dynobj = elf_hash_table (info)->dynobj;
5612 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5614 struct elf_info_failed eif;
5615 struct elf_link_hash_entry *h;
5617 struct bfd_elf_version_tree *t;
5618 struct bfd_elf_version_expr *d;
5620 bfd_boolean all_defined;
5622 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5623 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5627 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5629 if (soname_indx == (bfd_size_type) -1
5630 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5636 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5638 info->flags |= DF_SYMBOLIC;
5646 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5648 if (indx == (bfd_size_type) -1)
5651 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5652 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5656 if (filter_shlib != NULL)
5660 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5661 filter_shlib, TRUE);
5662 if (indx == (bfd_size_type) -1
5663 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5667 if (auxiliary_filters != NULL)
5669 const char * const *p;
5671 for (p = auxiliary_filters; *p != NULL; p++)
5675 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5677 if (indx == (bfd_size_type) -1
5678 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5687 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5689 if (indx == (bfd_size_type) -1
5690 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5694 if (depaudit != NULL)
5698 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5700 if (indx == (bfd_size_type) -1
5701 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5708 /* If we are supposed to export all symbols into the dynamic symbol
5709 table (this is not the normal case), then do so. */
5710 if (info->export_dynamic
5711 || (info->executable && info->dynamic))
5713 elf_link_hash_traverse (elf_hash_table (info),
5714 _bfd_elf_export_symbol,
5720 /* Make all global versions with definition. */
5721 for (t = info->version_info; t != NULL; t = t->next)
5722 for (d = t->globals.list; d != NULL; d = d->next)
5723 if (!d->symver && d->literal)
5725 const char *verstr, *name;
5726 size_t namelen, verlen, newlen;
5727 char *newname, *p, leading_char;
5728 struct elf_link_hash_entry *newh;
5730 leading_char = bfd_get_symbol_leading_char (output_bfd);
5732 namelen = strlen (name) + (leading_char != '\0');
5734 verlen = strlen (verstr);
5735 newlen = namelen + verlen + 3;
5737 newname = (char *) bfd_malloc (newlen);
5738 if (newname == NULL)
5740 newname[0] = leading_char;
5741 memcpy (newname + (leading_char != '\0'), name, namelen);
5743 /* Check the hidden versioned definition. */
5744 p = newname + namelen;
5746 memcpy (p, verstr, verlen + 1);
5747 newh = elf_link_hash_lookup (elf_hash_table (info),
5748 newname, FALSE, FALSE,
5751 || (newh->root.type != bfd_link_hash_defined
5752 && newh->root.type != bfd_link_hash_defweak))
5754 /* Check the default versioned definition. */
5756 memcpy (p, verstr, verlen + 1);
5757 newh = elf_link_hash_lookup (elf_hash_table (info),
5758 newname, FALSE, FALSE,
5763 /* Mark this version if there is a definition and it is
5764 not defined in a shared object. */
5766 && !newh->def_dynamic
5767 && (newh->root.type == bfd_link_hash_defined
5768 || newh->root.type == bfd_link_hash_defweak))
5772 /* Attach all the symbols to their version information. */
5773 asvinfo.info = info;
5774 asvinfo.failed = FALSE;
5776 elf_link_hash_traverse (elf_hash_table (info),
5777 _bfd_elf_link_assign_sym_version,
5782 if (!info->allow_undefined_version)
5784 /* Check if all global versions have a definition. */
5786 for (t = info->version_info; t != NULL; t = t->next)
5787 for (d = t->globals.list; d != NULL; d = d->next)
5788 if (d->literal && !d->symver && !d->script)
5790 (*_bfd_error_handler)
5791 (_("%s: undefined version: %s"),
5792 d->pattern, t->name);
5793 all_defined = FALSE;
5798 bfd_set_error (bfd_error_bad_value);
5803 /* Find all symbols which were defined in a dynamic object and make
5804 the backend pick a reasonable value for them. */
5805 elf_link_hash_traverse (elf_hash_table (info),
5806 _bfd_elf_adjust_dynamic_symbol,
5811 /* Add some entries to the .dynamic section. We fill in some of the
5812 values later, in bfd_elf_final_link, but we must add the entries
5813 now so that we know the final size of the .dynamic section. */
5815 /* If there are initialization and/or finalization functions to
5816 call then add the corresponding DT_INIT/DT_FINI entries. */
5817 h = (info->init_function
5818 ? elf_link_hash_lookup (elf_hash_table (info),
5819 info->init_function, FALSE,
5826 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5829 h = (info->fini_function
5830 ? elf_link_hash_lookup (elf_hash_table (info),
5831 info->fini_function, FALSE,
5838 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5842 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5843 if (s != NULL && s->linker_has_input)
5845 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5846 if (! info->executable)
5851 for (sub = info->input_bfds; sub != NULL;
5852 sub = sub->link.next)
5853 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5854 for (o = sub->sections; o != NULL; o = o->next)
5855 if (elf_section_data (o)->this_hdr.sh_type
5856 == SHT_PREINIT_ARRAY)
5858 (*_bfd_error_handler)
5859 (_("%B: .preinit_array section is not allowed in DSO"),
5864 bfd_set_error (bfd_error_nonrepresentable_section);
5868 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5869 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5872 s = bfd_get_section_by_name (output_bfd, ".init_array");
5873 if (s != NULL && s->linker_has_input)
5875 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5876 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5879 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5880 if (s != NULL && s->linker_has_input)
5882 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5883 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5887 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
5888 /* If .dynstr is excluded from the link, we don't want any of
5889 these tags. Strictly, we should be checking each section
5890 individually; This quick check covers for the case where
5891 someone does a /DISCARD/ : { *(*) }. */
5892 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5894 bfd_size_type strsize;
5896 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5897 if ((info->emit_hash
5898 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5899 || (info->emit_gnu_hash
5900 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5901 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5902 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5903 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5904 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5905 bed->s->sizeof_sym))
5910 /* The backend must work out the sizes of all the other dynamic
5913 && bed->elf_backend_size_dynamic_sections != NULL
5914 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5917 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5920 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5922 unsigned long section_sym_count;
5923 struct bfd_elf_version_tree *verdefs;
5926 /* Set up the version definition section. */
5927 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
5928 BFD_ASSERT (s != NULL);
5930 /* We may have created additional version definitions if we are
5931 just linking a regular application. */
5932 verdefs = info->version_info;
5934 /* Skip anonymous version tag. */
5935 if (verdefs != NULL && verdefs->vernum == 0)
5936 verdefs = verdefs->next;
5938 if (verdefs == NULL && !info->create_default_symver)
5939 s->flags |= SEC_EXCLUDE;
5944 struct bfd_elf_version_tree *t;
5946 Elf_Internal_Verdef def;
5947 Elf_Internal_Verdaux defaux;
5948 struct bfd_link_hash_entry *bh;
5949 struct elf_link_hash_entry *h;
5955 /* Make space for the base version. */
5956 size += sizeof (Elf_External_Verdef);
5957 size += sizeof (Elf_External_Verdaux);
5960 /* Make space for the default version. */
5961 if (info->create_default_symver)
5963 size += sizeof (Elf_External_Verdef);
5967 for (t = verdefs; t != NULL; t = t->next)
5969 struct bfd_elf_version_deps *n;
5971 /* Don't emit base version twice. */
5975 size += sizeof (Elf_External_Verdef);
5976 size += sizeof (Elf_External_Verdaux);
5979 for (n = t->deps; n != NULL; n = n->next)
5980 size += sizeof (Elf_External_Verdaux);
5984 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
5985 if (s->contents == NULL && s->size != 0)
5988 /* Fill in the version definition section. */
5992 def.vd_version = VER_DEF_CURRENT;
5993 def.vd_flags = VER_FLG_BASE;
5996 if (info->create_default_symver)
5998 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
5999 def.vd_next = sizeof (Elf_External_Verdef);
6003 def.vd_aux = sizeof (Elf_External_Verdef);
6004 def.vd_next = (sizeof (Elf_External_Verdef)
6005 + sizeof (Elf_External_Verdaux));
6008 if (soname_indx != (bfd_size_type) -1)
6010 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6012 def.vd_hash = bfd_elf_hash (soname);
6013 defaux.vda_name = soname_indx;
6020 name = lbasename (output_bfd->filename);
6021 def.vd_hash = bfd_elf_hash (name);
6022 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6024 if (indx == (bfd_size_type) -1)
6026 defaux.vda_name = indx;
6028 defaux.vda_next = 0;
6030 _bfd_elf_swap_verdef_out (output_bfd, &def,
6031 (Elf_External_Verdef *) p);
6032 p += sizeof (Elf_External_Verdef);
6033 if (info->create_default_symver)
6035 /* Add a symbol representing this version. */
6037 if (! (_bfd_generic_link_add_one_symbol
6038 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6040 get_elf_backend_data (dynobj)->collect, &bh)))
6042 h = (struct elf_link_hash_entry *) bh;
6045 h->type = STT_OBJECT;
6046 h->verinfo.vertree = NULL;
6048 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6051 /* Create a duplicate of the base version with the same
6052 aux block, but different flags. */
6055 def.vd_aux = sizeof (Elf_External_Verdef);
6057 def.vd_next = (sizeof (Elf_External_Verdef)
6058 + sizeof (Elf_External_Verdaux));
6061 _bfd_elf_swap_verdef_out (output_bfd, &def,
6062 (Elf_External_Verdef *) p);
6063 p += sizeof (Elf_External_Verdef);
6065 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6066 (Elf_External_Verdaux *) p);
6067 p += sizeof (Elf_External_Verdaux);
6069 for (t = verdefs; t != NULL; t = t->next)
6072 struct bfd_elf_version_deps *n;
6074 /* Don't emit the base version twice. */
6079 for (n = t->deps; n != NULL; n = n->next)
6082 /* Add a symbol representing this version. */
6084 if (! (_bfd_generic_link_add_one_symbol
6085 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6087 get_elf_backend_data (dynobj)->collect, &bh)))
6089 h = (struct elf_link_hash_entry *) bh;
6092 h->type = STT_OBJECT;
6093 h->verinfo.vertree = t;
6095 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6098 def.vd_version = VER_DEF_CURRENT;
6100 if (t->globals.list == NULL
6101 && t->locals.list == NULL
6103 def.vd_flags |= VER_FLG_WEAK;
6104 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6105 def.vd_cnt = cdeps + 1;
6106 def.vd_hash = bfd_elf_hash (t->name);
6107 def.vd_aux = sizeof (Elf_External_Verdef);
6110 /* If a basever node is next, it *must* be the last node in
6111 the chain, otherwise Verdef construction breaks. */
6112 if (t->next != NULL && t->next->vernum == 0)
6113 BFD_ASSERT (t->next->next == NULL);
6115 if (t->next != NULL && t->next->vernum != 0)
6116 def.vd_next = (sizeof (Elf_External_Verdef)
6117 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6119 _bfd_elf_swap_verdef_out (output_bfd, &def,
6120 (Elf_External_Verdef *) p);
6121 p += sizeof (Elf_External_Verdef);
6123 defaux.vda_name = h->dynstr_index;
6124 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6126 defaux.vda_next = 0;
6127 if (t->deps != NULL)
6128 defaux.vda_next = sizeof (Elf_External_Verdaux);
6129 t->name_indx = defaux.vda_name;
6131 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6132 (Elf_External_Verdaux *) p);
6133 p += sizeof (Elf_External_Verdaux);
6135 for (n = t->deps; n != NULL; n = n->next)
6137 if (n->version_needed == NULL)
6139 /* This can happen if there was an error in the
6141 defaux.vda_name = 0;
6145 defaux.vda_name = n->version_needed->name_indx;
6146 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6149 if (n->next == NULL)
6150 defaux.vda_next = 0;
6152 defaux.vda_next = sizeof (Elf_External_Verdaux);
6154 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6155 (Elf_External_Verdaux *) p);
6156 p += sizeof (Elf_External_Verdaux);
6160 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6161 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6164 elf_tdata (output_bfd)->cverdefs = cdefs;
6167 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6169 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6172 else if (info->flags & DF_BIND_NOW)
6174 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6180 if (info->executable)
6181 info->flags_1 &= ~ (DF_1_INITFIRST
6184 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6188 /* Work out the size of the version reference section. */
6190 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6191 BFD_ASSERT (s != NULL);
6193 struct elf_find_verdep_info sinfo;
6196 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6197 if (sinfo.vers == 0)
6199 sinfo.failed = FALSE;
6201 elf_link_hash_traverse (elf_hash_table (info),
6202 _bfd_elf_link_find_version_dependencies,
6207 if (elf_tdata (output_bfd)->verref == NULL)
6208 s->flags |= SEC_EXCLUDE;
6211 Elf_Internal_Verneed *t;
6216 /* Build the version dependency section. */
6219 for (t = elf_tdata (output_bfd)->verref;
6223 Elf_Internal_Vernaux *a;
6225 size += sizeof (Elf_External_Verneed);
6227 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6228 size += sizeof (Elf_External_Vernaux);
6232 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6233 if (s->contents == NULL)
6237 for (t = elf_tdata (output_bfd)->verref;
6242 Elf_Internal_Vernaux *a;
6246 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6249 t->vn_version = VER_NEED_CURRENT;
6251 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6252 elf_dt_name (t->vn_bfd) != NULL
6253 ? elf_dt_name (t->vn_bfd)
6254 : lbasename (t->vn_bfd->filename),
6256 if (indx == (bfd_size_type) -1)
6259 t->vn_aux = sizeof (Elf_External_Verneed);
6260 if (t->vn_nextref == NULL)
6263 t->vn_next = (sizeof (Elf_External_Verneed)
6264 + caux * sizeof (Elf_External_Vernaux));
6266 _bfd_elf_swap_verneed_out (output_bfd, t,
6267 (Elf_External_Verneed *) p);
6268 p += sizeof (Elf_External_Verneed);
6270 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6272 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6273 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6274 a->vna_nodename, FALSE);
6275 if (indx == (bfd_size_type) -1)
6278 if (a->vna_nextptr == NULL)
6281 a->vna_next = sizeof (Elf_External_Vernaux);
6283 _bfd_elf_swap_vernaux_out (output_bfd, a,
6284 (Elf_External_Vernaux *) p);
6285 p += sizeof (Elf_External_Vernaux);
6289 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6290 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6293 elf_tdata (output_bfd)->cverrefs = crefs;
6297 if ((elf_tdata (output_bfd)->cverrefs == 0
6298 && elf_tdata (output_bfd)->cverdefs == 0)
6299 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6300 §ion_sym_count) == 0)
6302 s = bfd_get_linker_section (dynobj, ".gnu.version");
6303 s->flags |= SEC_EXCLUDE;
6309 /* Find the first non-excluded output section. We'll use its
6310 section symbol for some emitted relocs. */
6312 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6316 for (s = output_bfd->sections; s != NULL; s = s->next)
6317 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6318 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6320 elf_hash_table (info)->text_index_section = s;
6325 /* Find two non-excluded output sections, one for code, one for data.
6326 We'll use their section symbols for some emitted relocs. */
6328 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6332 /* Data first, since setting text_index_section changes
6333 _bfd_elf_link_omit_section_dynsym. */
6334 for (s = output_bfd->sections; s != NULL; s = s->next)
6335 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6336 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6338 elf_hash_table (info)->data_index_section = s;
6342 for (s = output_bfd->sections; s != NULL; s = s->next)
6343 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6344 == (SEC_ALLOC | SEC_READONLY))
6345 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6347 elf_hash_table (info)->text_index_section = s;
6351 if (elf_hash_table (info)->text_index_section == NULL)
6352 elf_hash_table (info)->text_index_section
6353 = elf_hash_table (info)->data_index_section;
6357 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6359 const struct elf_backend_data *bed;
6361 if (!is_elf_hash_table (info->hash))
6364 bed = get_elf_backend_data (output_bfd);
6365 (*bed->elf_backend_init_index_section) (output_bfd, info);
6367 if (elf_hash_table (info)->dynamic_sections_created)
6371 bfd_size_type dynsymcount;
6372 unsigned long section_sym_count;
6373 unsigned int dtagcount;
6375 dynobj = elf_hash_table (info)->dynobj;
6377 /* Assign dynsym indicies. In a shared library we generate a
6378 section symbol for each output section, which come first.
6379 Next come all of the back-end allocated local dynamic syms,
6380 followed by the rest of the global symbols. */
6382 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6383 §ion_sym_count);
6385 /* Work out the size of the symbol version section. */
6386 s = bfd_get_linker_section (dynobj, ".gnu.version");
6387 BFD_ASSERT (s != NULL);
6388 if (dynsymcount != 0
6389 && (s->flags & SEC_EXCLUDE) == 0)
6391 s->size = dynsymcount * sizeof (Elf_External_Versym);
6392 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6393 if (s->contents == NULL)
6396 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6400 /* Set the size of the .dynsym and .hash sections. We counted
6401 the number of dynamic symbols in elf_link_add_object_symbols.
6402 We will build the contents of .dynsym and .hash when we build
6403 the final symbol table, because until then we do not know the
6404 correct value to give the symbols. We built the .dynstr
6405 section as we went along in elf_link_add_object_symbols. */
6406 s = bfd_get_linker_section (dynobj, ".dynsym");
6407 BFD_ASSERT (s != NULL);
6408 s->size = dynsymcount * bed->s->sizeof_sym;
6410 if (dynsymcount != 0)
6412 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6413 if (s->contents == NULL)
6416 /* The first entry in .dynsym is a dummy symbol.
6417 Clear all the section syms, in case we don't output them all. */
6418 ++section_sym_count;
6419 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6422 elf_hash_table (info)->bucketcount = 0;
6424 /* Compute the size of the hashing table. As a side effect this
6425 computes the hash values for all the names we export. */
6426 if (info->emit_hash)
6428 unsigned long int *hashcodes;
6429 struct hash_codes_info hashinf;
6431 unsigned long int nsyms;
6433 size_t hash_entry_size;
6435 /* Compute the hash values for all exported symbols. At the same
6436 time store the values in an array so that we could use them for
6438 amt = dynsymcount * sizeof (unsigned long int);
6439 hashcodes = (unsigned long int *) bfd_malloc (amt);
6440 if (hashcodes == NULL)
6442 hashinf.hashcodes = hashcodes;
6443 hashinf.error = FALSE;
6445 /* Put all hash values in HASHCODES. */
6446 elf_link_hash_traverse (elf_hash_table (info),
6447 elf_collect_hash_codes, &hashinf);
6454 nsyms = hashinf.hashcodes - hashcodes;
6456 = compute_bucket_count (info, hashcodes, nsyms, 0);
6459 if (bucketcount == 0)
6462 elf_hash_table (info)->bucketcount = bucketcount;
6464 s = bfd_get_linker_section (dynobj, ".hash");
6465 BFD_ASSERT (s != NULL);
6466 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6467 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6468 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6469 if (s->contents == NULL)
6472 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6473 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6474 s->contents + hash_entry_size);
6477 if (info->emit_gnu_hash)
6480 unsigned char *contents;
6481 struct collect_gnu_hash_codes cinfo;
6485 memset (&cinfo, 0, sizeof (cinfo));
6487 /* Compute the hash values for all exported symbols. At the same
6488 time store the values in an array so that we could use them for
6490 amt = dynsymcount * 2 * sizeof (unsigned long int);
6491 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6492 if (cinfo.hashcodes == NULL)
6495 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6496 cinfo.min_dynindx = -1;
6497 cinfo.output_bfd = output_bfd;
6500 /* Put all hash values in HASHCODES. */
6501 elf_link_hash_traverse (elf_hash_table (info),
6502 elf_collect_gnu_hash_codes, &cinfo);
6505 free (cinfo.hashcodes);
6510 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6512 if (bucketcount == 0)
6514 free (cinfo.hashcodes);
6518 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6519 BFD_ASSERT (s != NULL);
6521 if (cinfo.nsyms == 0)
6523 /* Empty .gnu.hash section is special. */
6524 BFD_ASSERT (cinfo.min_dynindx == -1);
6525 free (cinfo.hashcodes);
6526 s->size = 5 * 4 + bed->s->arch_size / 8;
6527 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6528 if (contents == NULL)
6530 s->contents = contents;
6531 /* 1 empty bucket. */
6532 bfd_put_32 (output_bfd, 1, contents);
6533 /* SYMIDX above the special symbol 0. */
6534 bfd_put_32 (output_bfd, 1, contents + 4);
6535 /* Just one word for bitmask. */
6536 bfd_put_32 (output_bfd, 1, contents + 8);
6537 /* Only hash fn bloom filter. */
6538 bfd_put_32 (output_bfd, 0, contents + 12);
6539 /* No hashes are valid - empty bitmask. */
6540 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6541 /* No hashes in the only bucket. */
6542 bfd_put_32 (output_bfd, 0,
6543 contents + 16 + bed->s->arch_size / 8);
6547 unsigned long int maskwords, maskbitslog2, x;
6548 BFD_ASSERT (cinfo.min_dynindx != -1);
6552 while ((x >>= 1) != 0)
6554 if (maskbitslog2 < 3)
6556 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6557 maskbitslog2 = maskbitslog2 + 3;
6559 maskbitslog2 = maskbitslog2 + 2;
6560 if (bed->s->arch_size == 64)
6562 if (maskbitslog2 == 5)
6568 cinfo.mask = (1 << cinfo.shift1) - 1;
6569 cinfo.shift2 = maskbitslog2;
6570 cinfo.maskbits = 1 << maskbitslog2;
6571 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6572 amt = bucketcount * sizeof (unsigned long int) * 2;
6573 amt += maskwords * sizeof (bfd_vma);
6574 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6575 if (cinfo.bitmask == NULL)
6577 free (cinfo.hashcodes);
6581 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6582 cinfo.indx = cinfo.counts + bucketcount;
6583 cinfo.symindx = dynsymcount - cinfo.nsyms;
6584 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6586 /* Determine how often each hash bucket is used. */
6587 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6588 for (i = 0; i < cinfo.nsyms; ++i)
6589 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6591 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6592 if (cinfo.counts[i] != 0)
6594 cinfo.indx[i] = cnt;
6595 cnt += cinfo.counts[i];
6597 BFD_ASSERT (cnt == dynsymcount);
6598 cinfo.bucketcount = bucketcount;
6599 cinfo.local_indx = cinfo.min_dynindx;
6601 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6602 s->size += cinfo.maskbits / 8;
6603 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6604 if (contents == NULL)
6606 free (cinfo.bitmask);
6607 free (cinfo.hashcodes);
6611 s->contents = contents;
6612 bfd_put_32 (output_bfd, bucketcount, contents);
6613 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6614 bfd_put_32 (output_bfd, maskwords, contents + 8);
6615 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6616 contents += 16 + cinfo.maskbits / 8;
6618 for (i = 0; i < bucketcount; ++i)
6620 if (cinfo.counts[i] == 0)
6621 bfd_put_32 (output_bfd, 0, contents);
6623 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6627 cinfo.contents = contents;
6629 /* Renumber dynamic symbols, populate .gnu.hash section. */
6630 elf_link_hash_traverse (elf_hash_table (info),
6631 elf_renumber_gnu_hash_syms, &cinfo);
6633 contents = s->contents + 16;
6634 for (i = 0; i < maskwords; ++i)
6636 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6638 contents += bed->s->arch_size / 8;
6641 free (cinfo.bitmask);
6642 free (cinfo.hashcodes);
6646 s = bfd_get_linker_section (dynobj, ".dynstr");
6647 BFD_ASSERT (s != NULL);
6649 elf_finalize_dynstr (output_bfd, info);
6651 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6653 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6654 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6661 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6664 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6667 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6668 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6671 /* Finish SHF_MERGE section merging. */
6674 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6679 if (!is_elf_hash_table (info->hash))
6682 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6683 if ((ibfd->flags & DYNAMIC) == 0)
6684 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6685 if ((sec->flags & SEC_MERGE) != 0
6686 && !bfd_is_abs_section (sec->output_section))
6688 struct bfd_elf_section_data *secdata;
6690 secdata = elf_section_data (sec);
6691 if (! _bfd_add_merge_section (abfd,
6692 &elf_hash_table (info)->merge_info,
6693 sec, &secdata->sec_info))
6695 else if (secdata->sec_info)
6696 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6699 if (elf_hash_table (info)->merge_info != NULL)
6700 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6701 merge_sections_remove_hook);
6705 /* Create an entry in an ELF linker hash table. */
6707 struct bfd_hash_entry *
6708 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6709 struct bfd_hash_table *table,
6712 /* Allocate the structure if it has not already been allocated by a
6716 entry = (struct bfd_hash_entry *)
6717 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6722 /* Call the allocation method of the superclass. */
6723 entry = _bfd_link_hash_newfunc (entry, table, string);
6726 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6727 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6729 /* Set local fields. */
6732 ret->got = htab->init_got_refcount;
6733 ret->plt = htab->init_plt_refcount;
6734 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6735 - offsetof (struct elf_link_hash_entry, size)));
6736 /* Assume that we have been called by a non-ELF symbol reader.
6737 This flag is then reset by the code which reads an ELF input
6738 file. This ensures that a symbol created by a non-ELF symbol
6739 reader will have the flag set correctly. */
6746 /* Copy data from an indirect symbol to its direct symbol, hiding the
6747 old indirect symbol. Also used for copying flags to a weakdef. */
6750 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6751 struct elf_link_hash_entry *dir,
6752 struct elf_link_hash_entry *ind)
6754 struct elf_link_hash_table *htab;
6756 /* Copy down any references that we may have already seen to the
6757 symbol which just became indirect. */
6759 dir->ref_dynamic |= ind->ref_dynamic;
6760 dir->ref_regular |= ind->ref_regular;
6761 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6762 dir->non_got_ref |= ind->non_got_ref;
6763 dir->needs_plt |= ind->needs_plt;
6764 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6766 if (ind->root.type != bfd_link_hash_indirect)
6769 /* Copy over the global and procedure linkage table refcount entries.
6770 These may have been already set up by a check_relocs routine. */
6771 htab = elf_hash_table (info);
6772 if (ind->got.refcount > htab->init_got_refcount.refcount)
6774 if (dir->got.refcount < 0)
6775 dir->got.refcount = 0;
6776 dir->got.refcount += ind->got.refcount;
6777 ind->got.refcount = htab->init_got_refcount.refcount;
6780 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6782 if (dir->plt.refcount < 0)
6783 dir->plt.refcount = 0;
6784 dir->plt.refcount += ind->plt.refcount;
6785 ind->plt.refcount = htab->init_plt_refcount.refcount;
6788 if (ind->dynindx != -1)
6790 if (dir->dynindx != -1)
6791 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6792 dir->dynindx = ind->dynindx;
6793 dir->dynstr_index = ind->dynstr_index;
6795 ind->dynstr_index = 0;
6800 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6801 struct elf_link_hash_entry *h,
6802 bfd_boolean force_local)
6804 /* STT_GNU_IFUNC symbol must go through PLT. */
6805 if (h->type != STT_GNU_IFUNC)
6807 h->plt = elf_hash_table (info)->init_plt_offset;
6812 h->forced_local = 1;
6813 if (h->dynindx != -1)
6816 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6822 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
6826 _bfd_elf_link_hash_table_init
6827 (struct elf_link_hash_table *table,
6829 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6830 struct bfd_hash_table *,
6832 unsigned int entsize,
6833 enum elf_target_id target_id)
6836 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6838 table->init_got_refcount.refcount = can_refcount - 1;
6839 table->init_plt_refcount.refcount = can_refcount - 1;
6840 table->init_got_offset.offset = -(bfd_vma) 1;
6841 table->init_plt_offset.offset = -(bfd_vma) 1;
6842 /* The first dynamic symbol is a dummy. */
6843 table->dynsymcount = 1;
6845 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6847 table->root.type = bfd_link_elf_hash_table;
6848 table->hash_table_id = target_id;
6853 /* Create an ELF linker hash table. */
6855 struct bfd_link_hash_table *
6856 _bfd_elf_link_hash_table_create (bfd *abfd)
6858 struct elf_link_hash_table *ret;
6859 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6861 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
6865 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6866 sizeof (struct elf_link_hash_entry),
6872 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
6877 /* Destroy an ELF linker hash table. */
6880 _bfd_elf_link_hash_table_free (bfd *obfd)
6882 struct elf_link_hash_table *htab;
6884 htab = (struct elf_link_hash_table *) obfd->link.hash;
6885 if (htab->dynstr != NULL)
6886 _bfd_elf_strtab_free (htab->dynstr);
6887 _bfd_merge_sections_free (htab->merge_info);
6888 _bfd_generic_link_hash_table_free (obfd);
6891 /* This is a hook for the ELF emulation code in the generic linker to
6892 tell the backend linker what file name to use for the DT_NEEDED
6893 entry for a dynamic object. */
6896 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6898 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6899 && bfd_get_format (abfd) == bfd_object)
6900 elf_dt_name (abfd) = name;
6904 bfd_elf_get_dyn_lib_class (bfd *abfd)
6907 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6908 && bfd_get_format (abfd) == bfd_object)
6909 lib_class = elf_dyn_lib_class (abfd);
6916 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6918 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6919 && bfd_get_format (abfd) == bfd_object)
6920 elf_dyn_lib_class (abfd) = lib_class;
6923 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6924 the linker ELF emulation code. */
6926 struct bfd_link_needed_list *
6927 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6928 struct bfd_link_info *info)
6930 if (! is_elf_hash_table (info->hash))
6932 return elf_hash_table (info)->needed;
6935 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6936 hook for the linker ELF emulation code. */
6938 struct bfd_link_needed_list *
6939 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6940 struct bfd_link_info *info)
6942 if (! is_elf_hash_table (info->hash))
6944 return elf_hash_table (info)->runpath;
6947 /* Get the name actually used for a dynamic object for a link. This
6948 is the SONAME entry if there is one. Otherwise, it is the string
6949 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6952 bfd_elf_get_dt_soname (bfd *abfd)
6954 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6955 && bfd_get_format (abfd) == bfd_object)
6956 return elf_dt_name (abfd);
6960 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6961 the ELF linker emulation code. */
6964 bfd_elf_get_bfd_needed_list (bfd *abfd,
6965 struct bfd_link_needed_list **pneeded)
6968 bfd_byte *dynbuf = NULL;
6969 unsigned int elfsec;
6970 unsigned long shlink;
6971 bfd_byte *extdyn, *extdynend;
6973 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6977 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6978 || bfd_get_format (abfd) != bfd_object)
6981 s = bfd_get_section_by_name (abfd, ".dynamic");
6982 if (s == NULL || s->size == 0)
6985 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6988 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6989 if (elfsec == SHN_BAD)
6992 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6994 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6995 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
6998 extdynend = extdyn + s->size;
6999 for (; extdyn < extdynend; extdyn += extdynsize)
7001 Elf_Internal_Dyn dyn;
7003 (*swap_dyn_in) (abfd, extdyn, &dyn);
7005 if (dyn.d_tag == DT_NULL)
7008 if (dyn.d_tag == DT_NEEDED)
7011 struct bfd_link_needed_list *l;
7012 unsigned int tagv = dyn.d_un.d_val;
7015 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7020 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7041 struct elf_symbuf_symbol
7043 unsigned long st_name; /* Symbol name, index in string tbl */
7044 unsigned char st_info; /* Type and binding attributes */
7045 unsigned char st_other; /* Visibilty, and target specific */
7048 struct elf_symbuf_head
7050 struct elf_symbuf_symbol *ssym;
7051 bfd_size_type count;
7052 unsigned int st_shndx;
7059 Elf_Internal_Sym *isym;
7060 struct elf_symbuf_symbol *ssym;
7065 /* Sort references to symbols by ascending section number. */
7068 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7070 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7071 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7073 return s1->st_shndx - s2->st_shndx;
7077 elf_sym_name_compare (const void *arg1, const void *arg2)
7079 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7080 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7081 return strcmp (s1->name, s2->name);
7084 static struct elf_symbuf_head *
7085 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7087 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7088 struct elf_symbuf_symbol *ssym;
7089 struct elf_symbuf_head *ssymbuf, *ssymhead;
7090 bfd_size_type i, shndx_count, total_size;
7092 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7096 for (ind = indbuf, i = 0; i < symcount; i++)
7097 if (isymbuf[i].st_shndx != SHN_UNDEF)
7098 *ind++ = &isymbuf[i];
7101 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7102 elf_sort_elf_symbol);
7105 if (indbufend > indbuf)
7106 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7107 if (ind[0]->st_shndx != ind[1]->st_shndx)
7110 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7111 + (indbufend - indbuf) * sizeof (*ssym));
7112 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7113 if (ssymbuf == NULL)
7119 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7120 ssymbuf->ssym = NULL;
7121 ssymbuf->count = shndx_count;
7122 ssymbuf->st_shndx = 0;
7123 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7125 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7128 ssymhead->ssym = ssym;
7129 ssymhead->count = 0;
7130 ssymhead->st_shndx = (*ind)->st_shndx;
7132 ssym->st_name = (*ind)->st_name;
7133 ssym->st_info = (*ind)->st_info;
7134 ssym->st_other = (*ind)->st_other;
7137 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7138 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7145 /* Check if 2 sections define the same set of local and global
7149 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7150 struct bfd_link_info *info)
7153 const struct elf_backend_data *bed1, *bed2;
7154 Elf_Internal_Shdr *hdr1, *hdr2;
7155 bfd_size_type symcount1, symcount2;
7156 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7157 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7158 Elf_Internal_Sym *isym, *isymend;
7159 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7160 bfd_size_type count1, count2, i;
7161 unsigned int shndx1, shndx2;
7167 /* Both sections have to be in ELF. */
7168 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7169 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7172 if (elf_section_type (sec1) != elf_section_type (sec2))
7175 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7176 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7177 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7180 bed1 = get_elf_backend_data (bfd1);
7181 bed2 = get_elf_backend_data (bfd2);
7182 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7183 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7184 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7185 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7187 if (symcount1 == 0 || symcount2 == 0)
7193 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7194 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7196 if (ssymbuf1 == NULL)
7198 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7200 if (isymbuf1 == NULL)
7203 if (!info->reduce_memory_overheads)
7204 elf_tdata (bfd1)->symbuf = ssymbuf1
7205 = elf_create_symbuf (symcount1, isymbuf1);
7208 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7210 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7212 if (isymbuf2 == NULL)
7215 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7216 elf_tdata (bfd2)->symbuf = ssymbuf2
7217 = elf_create_symbuf (symcount2, isymbuf2);
7220 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7222 /* Optimized faster version. */
7223 bfd_size_type lo, hi, mid;
7224 struct elf_symbol *symp;
7225 struct elf_symbuf_symbol *ssym, *ssymend;
7228 hi = ssymbuf1->count;
7233 mid = (lo + hi) / 2;
7234 if (shndx1 < ssymbuf1[mid].st_shndx)
7236 else if (shndx1 > ssymbuf1[mid].st_shndx)
7240 count1 = ssymbuf1[mid].count;
7247 hi = ssymbuf2->count;
7252 mid = (lo + hi) / 2;
7253 if (shndx2 < ssymbuf2[mid].st_shndx)
7255 else if (shndx2 > ssymbuf2[mid].st_shndx)
7259 count2 = ssymbuf2[mid].count;
7265 if (count1 == 0 || count2 == 0 || count1 != count2)
7269 = (struct elf_symbol *) bfd_malloc (count1 * sizeof (*symtable1));
7271 = (struct elf_symbol *) bfd_malloc (count2 * sizeof (*symtable2));
7272 if (symtable1 == NULL || symtable2 == NULL)
7276 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7277 ssym < ssymend; ssym++, symp++)
7279 symp->u.ssym = ssym;
7280 symp->name = bfd_elf_string_from_elf_section (bfd1,
7286 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7287 ssym < ssymend; ssym++, symp++)
7289 symp->u.ssym = ssym;
7290 symp->name = bfd_elf_string_from_elf_section (bfd2,
7295 /* Sort symbol by name. */
7296 qsort (symtable1, count1, sizeof (struct elf_symbol),
7297 elf_sym_name_compare);
7298 qsort (symtable2, count1, sizeof (struct elf_symbol),
7299 elf_sym_name_compare);
7301 for (i = 0; i < count1; i++)
7302 /* Two symbols must have the same binding, type and name. */
7303 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7304 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7305 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7312 symtable1 = (struct elf_symbol *)
7313 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7314 symtable2 = (struct elf_symbol *)
7315 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7316 if (symtable1 == NULL || symtable2 == NULL)
7319 /* Count definitions in the section. */
7321 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7322 if (isym->st_shndx == shndx1)
7323 symtable1[count1++].u.isym = isym;
7326 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7327 if (isym->st_shndx == shndx2)
7328 symtable2[count2++].u.isym = isym;
7330 if (count1 == 0 || count2 == 0 || count1 != count2)
7333 for (i = 0; i < count1; i++)
7335 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7336 symtable1[i].u.isym->st_name);
7338 for (i = 0; i < count2; i++)
7340 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7341 symtable2[i].u.isym->st_name);
7343 /* Sort symbol by name. */
7344 qsort (symtable1, count1, sizeof (struct elf_symbol),
7345 elf_sym_name_compare);
7346 qsort (symtable2, count1, sizeof (struct elf_symbol),
7347 elf_sym_name_compare);
7349 for (i = 0; i < count1; i++)
7350 /* Two symbols must have the same binding, type and name. */
7351 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7352 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7353 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7371 /* Return TRUE if 2 section types are compatible. */
7374 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7375 bfd *bbfd, const asection *bsec)
7379 || abfd->xvec->flavour != bfd_target_elf_flavour
7380 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7383 return elf_section_type (asec) == elf_section_type (bsec);
7386 /* Final phase of ELF linker. */
7388 /* A structure we use to avoid passing large numbers of arguments. */
7390 struct elf_final_link_info
7392 /* General link information. */
7393 struct bfd_link_info *info;
7396 /* Symbol string table. */
7397 struct bfd_strtab_hash *symstrtab;
7398 /* .dynsym section. */
7399 asection *dynsym_sec;
7400 /* .hash section. */
7402 /* symbol version section (.gnu.version). */
7403 asection *symver_sec;
7404 /* Buffer large enough to hold contents of any section. */
7406 /* Buffer large enough to hold external relocs of any section. */
7407 void *external_relocs;
7408 /* Buffer large enough to hold internal relocs of any section. */
7409 Elf_Internal_Rela *internal_relocs;
7410 /* Buffer large enough to hold external local symbols of any input
7412 bfd_byte *external_syms;
7413 /* And a buffer for symbol section indices. */
7414 Elf_External_Sym_Shndx *locsym_shndx;
7415 /* Buffer large enough to hold internal local symbols of any input
7417 Elf_Internal_Sym *internal_syms;
7418 /* Array large enough to hold a symbol index for each local symbol
7419 of any input BFD. */
7421 /* Array large enough to hold a section pointer for each local
7422 symbol of any input BFD. */
7423 asection **sections;
7424 /* Buffer to hold swapped out symbols. */
7426 /* And one for symbol section indices. */
7427 Elf_External_Sym_Shndx *symshndxbuf;
7428 /* Number of swapped out symbols in buffer. */
7429 size_t symbuf_count;
7430 /* Number of symbols which fit in symbuf. */
7432 /* And same for symshndxbuf. */
7433 size_t shndxbuf_size;
7434 /* Number of STT_FILE syms seen. */
7435 size_t filesym_count;
7438 /* This struct is used to pass information to elf_link_output_extsym. */
7440 struct elf_outext_info
7443 bfd_boolean localsyms;
7444 bfd_boolean file_sym_done;
7445 struct elf_final_link_info *flinfo;
7449 /* Support for evaluating a complex relocation.
7451 Complex relocations are generalized, self-describing relocations. The
7452 implementation of them consists of two parts: complex symbols, and the
7453 relocations themselves.
7455 The relocations are use a reserved elf-wide relocation type code (R_RELC
7456 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7457 information (start bit, end bit, word width, etc) into the addend. This
7458 information is extracted from CGEN-generated operand tables within gas.
7460 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7461 internal) representing prefix-notation expressions, including but not
7462 limited to those sorts of expressions normally encoded as addends in the
7463 addend field. The symbol mangling format is:
7466 | <unary-operator> ':' <node>
7467 | <binary-operator> ':' <node> ':' <node>
7470 <literal> := 's' <digits=N> ':' <N character symbol name>
7471 | 'S' <digits=N> ':' <N character section name>
7475 <binary-operator> := as in C
7476 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7479 set_symbol_value (bfd *bfd_with_globals,
7480 Elf_Internal_Sym *isymbuf,
7485 struct elf_link_hash_entry **sym_hashes;
7486 struct elf_link_hash_entry *h;
7487 size_t extsymoff = locsymcount;
7489 if (symidx < locsymcount)
7491 Elf_Internal_Sym *sym;
7493 sym = isymbuf + symidx;
7494 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7496 /* It is a local symbol: move it to the
7497 "absolute" section and give it a value. */
7498 sym->st_shndx = SHN_ABS;
7499 sym->st_value = val;
7502 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7506 /* It is a global symbol: set its link type
7507 to "defined" and give it a value. */
7509 sym_hashes = elf_sym_hashes (bfd_with_globals);
7510 h = sym_hashes [symidx - extsymoff];
7511 while (h->root.type == bfd_link_hash_indirect
7512 || h->root.type == bfd_link_hash_warning)
7513 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7514 h->root.type = bfd_link_hash_defined;
7515 h->root.u.def.value = val;
7516 h->root.u.def.section = bfd_abs_section_ptr;
7520 resolve_symbol (const char *name,
7522 struct elf_final_link_info *flinfo,
7524 Elf_Internal_Sym *isymbuf,
7527 Elf_Internal_Sym *sym;
7528 struct bfd_link_hash_entry *global_entry;
7529 const char *candidate = NULL;
7530 Elf_Internal_Shdr *symtab_hdr;
7533 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7535 for (i = 0; i < locsymcount; ++ i)
7539 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7542 candidate = bfd_elf_string_from_elf_section (input_bfd,
7543 symtab_hdr->sh_link,
7546 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7547 name, candidate, (unsigned long) sym->st_value);
7549 if (candidate && strcmp (candidate, name) == 0)
7551 asection *sec = flinfo->sections [i];
7553 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7554 *result += sec->output_offset + sec->output_section->vma;
7556 printf ("Found symbol with value %8.8lx\n",
7557 (unsigned long) *result);
7563 /* Hmm, haven't found it yet. perhaps it is a global. */
7564 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7565 FALSE, FALSE, TRUE);
7569 if (global_entry->type == bfd_link_hash_defined
7570 || global_entry->type == bfd_link_hash_defweak)
7572 *result = (global_entry->u.def.value
7573 + global_entry->u.def.section->output_section->vma
7574 + global_entry->u.def.section->output_offset);
7576 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7577 global_entry->root.string, (unsigned long) *result);
7586 resolve_section (const char *name,
7593 for (curr = sections; curr; curr = curr->next)
7594 if (strcmp (curr->name, name) == 0)
7596 *result = curr->vma;
7600 /* Hmm. still haven't found it. try pseudo-section names. */
7601 for (curr = sections; curr; curr = curr->next)
7603 len = strlen (curr->name);
7604 if (len > strlen (name))
7607 if (strncmp (curr->name, name, len) == 0)
7609 if (strncmp (".end", name + len, 4) == 0)
7611 *result = curr->vma + curr->size;
7615 /* Insert more pseudo-section names here, if you like. */
7623 undefined_reference (const char *reftype, const char *name)
7625 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7630 eval_symbol (bfd_vma *result,
7633 struct elf_final_link_info *flinfo,
7635 Elf_Internal_Sym *isymbuf,
7644 const char *sym = *symp;
7646 bfd_boolean symbol_is_section = FALSE;
7651 if (len < 1 || len > sizeof (symbuf))
7653 bfd_set_error (bfd_error_invalid_operation);
7666 *result = strtoul (sym, (char **) symp, 16);
7670 symbol_is_section = TRUE;
7673 symlen = strtol (sym, (char **) symp, 10);
7674 sym = *symp + 1; /* Skip the trailing ':'. */
7676 if (symend < sym || symlen + 1 > sizeof (symbuf))
7678 bfd_set_error (bfd_error_invalid_operation);
7682 memcpy (symbuf, sym, symlen);
7683 symbuf[symlen] = '\0';
7684 *symp = sym + symlen;
7686 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7687 the symbol as a section, or vice-versa. so we're pretty liberal in our
7688 interpretation here; section means "try section first", not "must be a
7689 section", and likewise with symbol. */
7691 if (symbol_is_section)
7693 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result)
7694 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7695 isymbuf, locsymcount))
7697 undefined_reference ("section", symbuf);
7703 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7704 isymbuf, locsymcount)
7705 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7708 undefined_reference ("symbol", symbuf);
7715 /* All that remains are operators. */
7717 #define UNARY_OP(op) \
7718 if (strncmp (sym, #op, strlen (#op)) == 0) \
7720 sym += strlen (#op); \
7724 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7725 isymbuf, locsymcount, signed_p)) \
7728 *result = op ((bfd_signed_vma) a); \
7734 #define BINARY_OP(op) \
7735 if (strncmp (sym, #op, strlen (#op)) == 0) \
7737 sym += strlen (#op); \
7741 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7742 isymbuf, locsymcount, signed_p)) \
7745 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7746 isymbuf, locsymcount, signed_p)) \
7749 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7779 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7780 bfd_set_error (bfd_error_invalid_operation);
7786 put_value (bfd_vma size,
7787 unsigned long chunksz,
7792 location += (size - chunksz);
7794 for (; size; size -= chunksz, location -= chunksz)
7799 bfd_put_8 (input_bfd, x, location);
7803 bfd_put_16 (input_bfd, x, location);
7807 bfd_put_32 (input_bfd, x, location);
7808 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
7814 bfd_put_64 (input_bfd, x, location);
7815 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
7828 get_value (bfd_vma size,
7829 unsigned long chunksz,
7836 /* Sanity checks. */
7837 BFD_ASSERT (chunksz <= sizeof (x)
7840 && (size % chunksz) == 0
7841 && input_bfd != NULL
7842 && location != NULL);
7844 if (chunksz == sizeof (x))
7846 BFD_ASSERT (size == chunksz);
7848 /* Make sure that we do not perform an undefined shift operation.
7849 We know that size == chunksz so there will only be one iteration
7850 of the loop below. */
7854 shift = 8 * chunksz;
7856 for (; size; size -= chunksz, location += chunksz)
7861 x = (x << shift) | bfd_get_8 (input_bfd, location);
7864 x = (x << shift) | bfd_get_16 (input_bfd, location);
7867 x = (x << shift) | bfd_get_32 (input_bfd, location);
7871 x = (x << shift) | bfd_get_64 (input_bfd, location);
7882 decode_complex_addend (unsigned long *start, /* in bits */
7883 unsigned long *oplen, /* in bits */
7884 unsigned long *len, /* in bits */
7885 unsigned long *wordsz, /* in bytes */
7886 unsigned long *chunksz, /* in bytes */
7887 unsigned long *lsb0_p,
7888 unsigned long *signed_p,
7889 unsigned long *trunc_p,
7890 unsigned long encoded)
7892 * start = encoded & 0x3F;
7893 * len = (encoded >> 6) & 0x3F;
7894 * oplen = (encoded >> 12) & 0x3F;
7895 * wordsz = (encoded >> 18) & 0xF;
7896 * chunksz = (encoded >> 22) & 0xF;
7897 * lsb0_p = (encoded >> 27) & 1;
7898 * signed_p = (encoded >> 28) & 1;
7899 * trunc_p = (encoded >> 29) & 1;
7902 bfd_reloc_status_type
7903 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7904 asection *input_section ATTRIBUTE_UNUSED,
7906 Elf_Internal_Rela *rel,
7909 bfd_vma shift, x, mask;
7910 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7911 bfd_reloc_status_type r;
7913 /* Perform this reloc, since it is complex.
7914 (this is not to say that it necessarily refers to a complex
7915 symbol; merely that it is a self-describing CGEN based reloc.
7916 i.e. the addend has the complete reloc information (bit start, end,
7917 word size, etc) encoded within it.). */
7919 decode_complex_addend (&start, &oplen, &len, &wordsz,
7920 &chunksz, &lsb0_p, &signed_p,
7921 &trunc_p, rel->r_addend);
7923 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7926 shift = (start + 1) - len;
7928 shift = (8 * wordsz) - (start + len);
7930 /* FIXME: octets_per_byte. */
7931 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7934 printf ("Doing complex reloc: "
7935 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7936 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7937 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7938 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7939 oplen, (unsigned long) x, (unsigned long) mask,
7940 (unsigned long) relocation);
7945 /* Now do an overflow check. */
7946 r = bfd_check_overflow ((signed_p
7947 ? complain_overflow_signed
7948 : complain_overflow_unsigned),
7949 len, 0, (8 * wordsz),
7953 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7956 printf (" relocation: %8.8lx\n"
7957 " shifted mask: %8.8lx\n"
7958 " shifted/masked reloc: %8.8lx\n"
7959 " result: %8.8lx\n",
7960 (unsigned long) relocation, (unsigned long) (mask << shift),
7961 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
7963 /* FIXME: octets_per_byte. */
7964 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7968 /* qsort comparison functions sorting external relocs by r_offset. */
7971 cmp_ext32l_r_offset (const void *p, const void *q)
7978 const union aligned32 *a
7979 = (const union aligned32 *) ((const Elf32_External_Rel *) p)->r_offset;
7980 const union aligned32 *b
7981 = (const union aligned32 *) ((const Elf32_External_Rel *) q)->r_offset;
7983 uint32_t aval = ( (uint32_t) a->c[0]
7984 | (uint32_t) a->c[1] << 8
7985 | (uint32_t) a->c[2] << 16
7986 | (uint32_t) a->c[3] << 24);
7987 uint32_t bval = ( (uint32_t) b->c[0]
7988 | (uint32_t) b->c[1] << 8
7989 | (uint32_t) b->c[2] << 16
7990 | (uint32_t) b->c[3] << 24);
7993 else if (aval > bval)
7999 cmp_ext32b_r_offset (const void *p, const void *q)
8006 const union aligned32 *a
8007 = (const union aligned32 *) ((const Elf32_External_Rel *) p)->r_offset;
8008 const union aligned32 *b
8009 = (const union aligned32 *) ((const Elf32_External_Rel *) q)->r_offset;
8011 uint32_t aval = ( (uint32_t) a->c[0] << 24
8012 | (uint32_t) a->c[1] << 16
8013 | (uint32_t) a->c[2] << 8
8014 | (uint32_t) a->c[3]);
8015 uint32_t bval = ( (uint32_t) b->c[0] << 24
8016 | (uint32_t) b->c[1] << 16
8017 | (uint32_t) b->c[2] << 8
8018 | (uint32_t) b->c[3]);
8021 else if (aval > bval)
8026 #ifdef BFD_HOST_64_BIT
8028 cmp_ext64l_r_offset (const void *p, const void *q)
8035 const union aligned64 *a
8036 = (const union aligned64 *) ((const Elf64_External_Rel *) p)->r_offset;
8037 const union aligned64 *b
8038 = (const union aligned64 *) ((const Elf64_External_Rel *) q)->r_offset;
8040 uint64_t aval = ( (uint64_t) a->c[0]
8041 | (uint64_t) a->c[1] << 8
8042 | (uint64_t) a->c[2] << 16
8043 | (uint64_t) a->c[3] << 24
8044 | (uint64_t) a->c[4] << 32
8045 | (uint64_t) a->c[5] << 40
8046 | (uint64_t) a->c[6] << 48
8047 | (uint64_t) a->c[7] << 56);
8048 uint64_t bval = ( (uint64_t) b->c[0]
8049 | (uint64_t) b->c[1] << 8
8050 | (uint64_t) b->c[2] << 16
8051 | (uint64_t) b->c[3] << 24
8052 | (uint64_t) b->c[4] << 32
8053 | (uint64_t) b->c[5] << 40
8054 | (uint64_t) b->c[6] << 48
8055 | (uint64_t) b->c[7] << 56);
8058 else if (aval > bval)
8064 cmp_ext64b_r_offset (const void *p, const void *q)
8071 const union aligned64 *a
8072 = (const union aligned64 *) ((const Elf64_External_Rel *) p)->r_offset;
8073 const union aligned64 *b
8074 = (const union aligned64 *) ((const Elf64_External_Rel *) q)->r_offset;
8076 uint64_t aval = ( (uint64_t) a->c[0] << 56
8077 | (uint64_t) a->c[1] << 48
8078 | (uint64_t) a->c[2] << 40
8079 | (uint64_t) a->c[3] << 32
8080 | (uint64_t) a->c[4] << 24
8081 | (uint64_t) a->c[5] << 16
8082 | (uint64_t) a->c[6] << 8
8083 | (uint64_t) a->c[7]);
8084 uint64_t bval = ( (uint64_t) b->c[0] << 56
8085 | (uint64_t) b->c[1] << 48
8086 | (uint64_t) b->c[2] << 40
8087 | (uint64_t) b->c[3] << 32
8088 | (uint64_t) b->c[4] << 24
8089 | (uint64_t) b->c[5] << 16
8090 | (uint64_t) b->c[6] << 8
8091 | (uint64_t) b->c[7]);
8094 else if (aval > bval)
8100 /* When performing a relocatable link, the input relocations are
8101 preserved. But, if they reference global symbols, the indices
8102 referenced must be updated. Update all the relocations found in
8106 elf_link_adjust_relocs (bfd *abfd,
8107 struct bfd_elf_section_reloc_data *reldata,
8111 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8113 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8114 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8115 bfd_vma r_type_mask;
8117 unsigned int count = reldata->count;
8118 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8120 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8122 swap_in = bed->s->swap_reloc_in;
8123 swap_out = bed->s->swap_reloc_out;
8125 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8127 swap_in = bed->s->swap_reloca_in;
8128 swap_out = bed->s->swap_reloca_out;
8133 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8136 if (bed->s->arch_size == 32)
8143 r_type_mask = 0xffffffff;
8147 erela = reldata->hdr->contents;
8148 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8150 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8153 if (*rel_hash == NULL)
8156 BFD_ASSERT ((*rel_hash)->indx >= 0);
8158 (*swap_in) (abfd, erela, irela);
8159 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8160 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8161 | (irela[j].r_info & r_type_mask));
8162 (*swap_out) (abfd, irela, erela);
8167 int (*compare) (const void *, const void *);
8169 if (bed->s->arch_size == 32)
8171 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8172 compare = cmp_ext32l_r_offset;
8173 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8174 compare = cmp_ext32b_r_offset;
8180 #ifdef BFD_HOST_64_BIT
8181 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8182 compare = cmp_ext64l_r_offset;
8183 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8184 compare = cmp_ext64b_r_offset;
8189 qsort (reldata->hdr->contents, count, reldata->hdr->sh_entsize, compare);
8190 free (reldata->hashes);
8191 reldata->hashes = NULL;
8195 struct elf_link_sort_rela
8201 enum elf_reloc_type_class type;
8202 /* We use this as an array of size int_rels_per_ext_rel. */
8203 Elf_Internal_Rela rela[1];
8207 elf_link_sort_cmp1 (const void *A, const void *B)
8209 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8210 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8211 int relativea, relativeb;
8213 relativea = a->type == reloc_class_relative;
8214 relativeb = b->type == reloc_class_relative;
8216 if (relativea < relativeb)
8218 if (relativea > relativeb)
8220 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8222 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8224 if (a->rela->r_offset < b->rela->r_offset)
8226 if (a->rela->r_offset > b->rela->r_offset)
8232 elf_link_sort_cmp2 (const void *A, const void *B)
8234 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8235 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8237 if (a->type < b->type)
8239 if (a->type > b->type)
8241 if (a->u.offset < b->u.offset)
8243 if (a->u.offset > b->u.offset)
8245 if (a->rela->r_offset < b->rela->r_offset)
8247 if (a->rela->r_offset > b->rela->r_offset)
8253 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8255 asection *dynamic_relocs;
8258 bfd_size_type count, size;
8259 size_t i, ret, sort_elt, ext_size;
8260 bfd_byte *sort, *s_non_relative, *p;
8261 struct elf_link_sort_rela *sq;
8262 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8263 int i2e = bed->s->int_rels_per_ext_rel;
8264 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8265 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8266 struct bfd_link_order *lo;
8268 bfd_boolean use_rela;
8270 /* Find a dynamic reloc section. */
8271 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8272 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8273 if (rela_dyn != NULL && rela_dyn->size > 0
8274 && rel_dyn != NULL && rel_dyn->size > 0)
8276 bfd_boolean use_rela_initialised = FALSE;
8278 /* This is just here to stop gcc from complaining.
8279 It's initialization checking code is not perfect. */
8282 /* Both sections are present. Examine the sizes
8283 of the indirect sections to help us choose. */
8284 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8285 if (lo->type == bfd_indirect_link_order)
8287 asection *o = lo->u.indirect.section;
8289 if ((o->size % bed->s->sizeof_rela) == 0)
8291 if ((o->size % bed->s->sizeof_rel) == 0)
8292 /* Section size is divisible by both rel and rela sizes.
8293 It is of no help to us. */
8297 /* Section size is only divisible by rela. */
8298 if (use_rela_initialised && (use_rela == FALSE))
8301 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8302 bfd_set_error (bfd_error_invalid_operation);
8308 use_rela_initialised = TRUE;
8312 else if ((o->size % bed->s->sizeof_rel) == 0)
8314 /* Section size is only divisible by rel. */
8315 if (use_rela_initialised && (use_rela == TRUE))
8318 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8319 bfd_set_error (bfd_error_invalid_operation);
8325 use_rela_initialised = TRUE;
8330 /* The section size is not divisible by either - something is wrong. */
8332 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8333 bfd_set_error (bfd_error_invalid_operation);
8338 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8339 if (lo->type == bfd_indirect_link_order)
8341 asection *o = lo->u.indirect.section;
8343 if ((o->size % bed->s->sizeof_rela) == 0)
8345 if ((o->size % bed->s->sizeof_rel) == 0)
8346 /* Section size is divisible by both rel and rela sizes.
8347 It is of no help to us. */
8351 /* Section size is only divisible by rela. */
8352 if (use_rela_initialised && (use_rela == FALSE))
8355 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8356 bfd_set_error (bfd_error_invalid_operation);
8362 use_rela_initialised = TRUE;
8366 else if ((o->size % bed->s->sizeof_rel) == 0)
8368 /* Section size is only divisible by rel. */
8369 if (use_rela_initialised && (use_rela == TRUE))
8372 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8373 bfd_set_error (bfd_error_invalid_operation);
8379 use_rela_initialised = TRUE;
8384 /* The section size is not divisible by either - something is wrong. */
8386 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8387 bfd_set_error (bfd_error_invalid_operation);
8392 if (! use_rela_initialised)
8396 else if (rela_dyn != NULL && rela_dyn->size > 0)
8398 else if (rel_dyn != NULL && rel_dyn->size > 0)
8405 dynamic_relocs = rela_dyn;
8406 ext_size = bed->s->sizeof_rela;
8407 swap_in = bed->s->swap_reloca_in;
8408 swap_out = bed->s->swap_reloca_out;
8412 dynamic_relocs = rel_dyn;
8413 ext_size = bed->s->sizeof_rel;
8414 swap_in = bed->s->swap_reloc_in;
8415 swap_out = bed->s->swap_reloc_out;
8419 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8420 if (lo->type == bfd_indirect_link_order)
8421 size += lo->u.indirect.section->size;
8423 if (size != dynamic_relocs->size)
8426 sort_elt = (sizeof (struct elf_link_sort_rela)
8427 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8429 count = dynamic_relocs->size / ext_size;
8432 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8436 (*info->callbacks->warning)
8437 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8441 if (bed->s->arch_size == 32)
8442 r_sym_mask = ~(bfd_vma) 0xff;
8444 r_sym_mask = ~(bfd_vma) 0xffffffff;
8446 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8447 if (lo->type == bfd_indirect_link_order)
8449 bfd_byte *erel, *erelend;
8450 asection *o = lo->u.indirect.section;
8452 if (o->contents == NULL && o->size != 0)
8454 /* This is a reloc section that is being handled as a normal
8455 section. See bfd_section_from_shdr. We can't combine
8456 relocs in this case. */
8461 erelend = o->contents + o->size;
8462 /* FIXME: octets_per_byte. */
8463 p = sort + o->output_offset / ext_size * sort_elt;
8465 while (erel < erelend)
8467 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8469 (*swap_in) (abfd, erel, s->rela);
8470 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8471 s->u.sym_mask = r_sym_mask;
8477 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8479 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8481 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8482 if (s->type != reloc_class_relative)
8488 sq = (struct elf_link_sort_rela *) s_non_relative;
8489 for (; i < count; i++, p += sort_elt)
8491 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8492 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8494 sp->u.offset = sq->rela->r_offset;
8497 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8499 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8500 if (lo->type == bfd_indirect_link_order)
8502 bfd_byte *erel, *erelend;
8503 asection *o = lo->u.indirect.section;
8506 erelend = o->contents + o->size;
8507 /* FIXME: octets_per_byte. */
8508 p = sort + o->output_offset / ext_size * sort_elt;
8509 while (erel < erelend)
8511 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8512 (*swap_out) (abfd, s->rela, erel);
8519 *psec = dynamic_relocs;
8523 /* Flush the output symbols to the file. */
8526 elf_link_flush_output_syms (struct elf_final_link_info *flinfo,
8527 const struct elf_backend_data *bed)
8529 if (flinfo->symbuf_count > 0)
8531 Elf_Internal_Shdr *hdr;
8535 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8536 pos = hdr->sh_offset + hdr->sh_size;
8537 amt = flinfo->symbuf_count * bed->s->sizeof_sym;
8538 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) != 0
8539 || bfd_bwrite (flinfo->symbuf, amt, flinfo->output_bfd) != amt)
8542 hdr->sh_size += amt;
8543 flinfo->symbuf_count = 0;
8549 /* Add a symbol to the output symbol table. */
8552 elf_link_output_sym (struct elf_final_link_info *flinfo,
8554 Elf_Internal_Sym *elfsym,
8555 asection *input_sec,
8556 struct elf_link_hash_entry *h)
8559 Elf_External_Sym_Shndx *destshndx;
8560 int (*output_symbol_hook)
8561 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8562 struct elf_link_hash_entry *);
8563 const struct elf_backend_data *bed;
8565 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8567 bed = get_elf_backend_data (flinfo->output_bfd);
8568 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8569 if (output_symbol_hook != NULL)
8571 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8576 if (name == NULL || *name == '\0')
8577 elfsym->st_name = 0;
8578 else if (input_sec->flags & SEC_EXCLUDE)
8579 elfsym->st_name = 0;
8582 elfsym->st_name = (unsigned long) _bfd_stringtab_add (flinfo->symstrtab,
8584 if (elfsym->st_name == (unsigned long) -1)
8588 if (flinfo->symbuf_count >= flinfo->symbuf_size)
8590 if (! elf_link_flush_output_syms (flinfo, bed))
8594 dest = flinfo->symbuf + flinfo->symbuf_count * bed->s->sizeof_sym;
8595 destshndx = flinfo->symshndxbuf;
8596 if (destshndx != NULL)
8598 if (bfd_get_symcount (flinfo->output_bfd) >= flinfo->shndxbuf_size)
8602 amt = flinfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8603 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8605 if (destshndx == NULL)
8607 flinfo->symshndxbuf = destshndx;
8608 memset ((char *) destshndx + amt, 0, amt);
8609 flinfo->shndxbuf_size *= 2;
8611 destshndx += bfd_get_symcount (flinfo->output_bfd);
8614 bed->s->swap_symbol_out (flinfo->output_bfd, elfsym, dest, destshndx);
8615 flinfo->symbuf_count += 1;
8616 bfd_get_symcount (flinfo->output_bfd) += 1;
8621 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8624 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8626 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8627 && sym->st_shndx < SHN_LORESERVE)
8629 /* The gABI doesn't support dynamic symbols in output sections
8631 (*_bfd_error_handler)
8632 (_("%B: Too many sections: %d (>= %d)"),
8633 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8634 bfd_set_error (bfd_error_nonrepresentable_section);
8640 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8641 allowing an unsatisfied unversioned symbol in the DSO to match a
8642 versioned symbol that would normally require an explicit version.
8643 We also handle the case that a DSO references a hidden symbol
8644 which may be satisfied by a versioned symbol in another DSO. */
8647 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8648 const struct elf_backend_data *bed,
8649 struct elf_link_hash_entry *h)
8652 struct elf_link_loaded_list *loaded;
8654 if (!is_elf_hash_table (info->hash))
8657 /* Check indirect symbol. */
8658 while (h->root.type == bfd_link_hash_indirect)
8659 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8661 switch (h->root.type)
8667 case bfd_link_hash_undefined:
8668 case bfd_link_hash_undefweak:
8669 abfd = h->root.u.undef.abfd;
8670 if ((abfd->flags & DYNAMIC) == 0
8671 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8675 case bfd_link_hash_defined:
8676 case bfd_link_hash_defweak:
8677 abfd = h->root.u.def.section->owner;
8680 case bfd_link_hash_common:
8681 abfd = h->root.u.c.p->section->owner;
8684 BFD_ASSERT (abfd != NULL);
8686 for (loaded = elf_hash_table (info)->loaded;
8688 loaded = loaded->next)
8691 Elf_Internal_Shdr *hdr;
8692 bfd_size_type symcount;
8693 bfd_size_type extsymcount;
8694 bfd_size_type extsymoff;
8695 Elf_Internal_Shdr *versymhdr;
8696 Elf_Internal_Sym *isym;
8697 Elf_Internal_Sym *isymend;
8698 Elf_Internal_Sym *isymbuf;
8699 Elf_External_Versym *ever;
8700 Elf_External_Versym *extversym;
8702 input = loaded->abfd;
8704 /* We check each DSO for a possible hidden versioned definition. */
8706 || (input->flags & DYNAMIC) == 0
8707 || elf_dynversym (input) == 0)
8710 hdr = &elf_tdata (input)->dynsymtab_hdr;
8712 symcount = hdr->sh_size / bed->s->sizeof_sym;
8713 if (elf_bad_symtab (input))
8715 extsymcount = symcount;
8720 extsymcount = symcount - hdr->sh_info;
8721 extsymoff = hdr->sh_info;
8724 if (extsymcount == 0)
8727 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8729 if (isymbuf == NULL)
8732 /* Read in any version definitions. */
8733 versymhdr = &elf_tdata (input)->dynversym_hdr;
8734 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8735 if (extversym == NULL)
8738 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8739 || (bfd_bread (extversym, versymhdr->sh_size, input)
8740 != versymhdr->sh_size))
8748 ever = extversym + extsymoff;
8749 isymend = isymbuf + extsymcount;
8750 for (isym = isymbuf; isym < isymend; isym++, ever++)
8753 Elf_Internal_Versym iver;
8754 unsigned short version_index;
8756 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8757 || isym->st_shndx == SHN_UNDEF)
8760 name = bfd_elf_string_from_elf_section (input,
8763 if (strcmp (name, h->root.root.string) != 0)
8766 _bfd_elf_swap_versym_in (input, ever, &iver);
8768 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8770 && h->forced_local))
8772 /* If we have a non-hidden versioned sym, then it should
8773 have provided a definition for the undefined sym unless
8774 it is defined in a non-shared object and forced local.
8779 version_index = iver.vs_vers & VERSYM_VERSION;
8780 if (version_index == 1 || version_index == 2)
8782 /* This is the base or first version. We can use it. */
8796 /* Add an external symbol to the symbol table. This is called from
8797 the hash table traversal routine. When generating a shared object,
8798 we go through the symbol table twice. The first time we output
8799 anything that might have been forced to local scope in a version
8800 script. The second time we output the symbols that are still
8804 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
8806 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
8807 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8808 struct elf_final_link_info *flinfo = eoinfo->flinfo;
8810 Elf_Internal_Sym sym;
8811 asection *input_sec;
8812 const struct elf_backend_data *bed;
8816 if (h->root.type == bfd_link_hash_warning)
8818 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8819 if (h->root.type == bfd_link_hash_new)
8823 /* Decide whether to output this symbol in this pass. */
8824 if (eoinfo->localsyms)
8826 if (!h->forced_local)
8831 if (h->forced_local)
8835 bed = get_elf_backend_data (flinfo->output_bfd);
8837 if (h->root.type == bfd_link_hash_undefined)
8839 /* If we have an undefined symbol reference here then it must have
8840 come from a shared library that is being linked in. (Undefined
8841 references in regular files have already been handled unless
8842 they are in unreferenced sections which are removed by garbage
8844 bfd_boolean ignore_undef = FALSE;
8846 /* Some symbols may be special in that the fact that they're
8847 undefined can be safely ignored - let backend determine that. */
8848 if (bed->elf_backend_ignore_undef_symbol)
8849 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8851 /* If we are reporting errors for this situation then do so now. */
8854 && (!h->ref_regular || flinfo->info->gc_sections)
8855 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
8856 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8858 if (!(flinfo->info->callbacks->undefined_symbol
8859 (flinfo->info, h->root.root.string,
8860 h->ref_regular ? NULL : h->root.u.undef.abfd,
8862 (flinfo->info->unresolved_syms_in_shared_libs
8863 == RM_GENERATE_ERROR))))
8865 bfd_set_error (bfd_error_bad_value);
8866 eoinfo->failed = TRUE;
8872 /* We should also warn if a forced local symbol is referenced from
8873 shared libraries. */
8874 if (!flinfo->info->relocatable
8875 && flinfo->info->executable
8880 && h->ref_dynamic_nonweak
8881 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
8885 struct elf_link_hash_entry *hi = h;
8887 /* Check indirect symbol. */
8888 while (hi->root.type == bfd_link_hash_indirect)
8889 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
8891 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
8892 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
8893 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
8894 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
8896 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
8897 def_bfd = flinfo->output_bfd;
8898 if (hi->root.u.def.section != bfd_abs_section_ptr)
8899 def_bfd = hi->root.u.def.section->owner;
8900 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
8901 h->root.root.string);
8902 bfd_set_error (bfd_error_bad_value);
8903 eoinfo->failed = TRUE;
8907 /* We don't want to output symbols that have never been mentioned by
8908 a regular file, or that we have been told to strip. However, if
8909 h->indx is set to -2, the symbol is used by a reloc and we must
8914 else if ((h->def_dynamic
8916 || h->root.type == bfd_link_hash_new)
8920 else if (flinfo->info->strip == strip_all)
8922 else if (flinfo->info->strip == strip_some
8923 && bfd_hash_lookup (flinfo->info->keep_hash,
8924 h->root.root.string, FALSE, FALSE) == NULL)
8926 else if ((h->root.type == bfd_link_hash_defined
8927 || h->root.type == bfd_link_hash_defweak)
8928 && ((flinfo->info->strip_discarded
8929 && discarded_section (h->root.u.def.section))
8930 || ((h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0
8931 && h->root.u.def.section->owner != NULL
8932 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
8934 else if ((h->root.type == bfd_link_hash_undefined
8935 || h->root.type == bfd_link_hash_undefweak)
8936 && h->root.u.undef.abfd != NULL
8937 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
8940 /* If we're stripping it, and it's not a dynamic symbol, there's
8941 nothing else to do. However, if it is a forced local symbol or
8942 an ifunc symbol we need to give the backend finish_dynamic_symbol
8943 function a chance to make it dynamic. */
8946 && h->type != STT_GNU_IFUNC
8947 && !h->forced_local)
8951 sym.st_size = h->size;
8952 sym.st_other = h->other;
8953 if (h->forced_local)
8955 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8956 /* Turn off visibility on local symbol. */
8957 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8959 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
8960 else if (h->unique_global && h->def_regular)
8961 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8962 else if (h->root.type == bfd_link_hash_undefweak
8963 || h->root.type == bfd_link_hash_defweak)
8964 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8966 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8967 sym.st_target_internal = h->target_internal;
8969 switch (h->root.type)
8972 case bfd_link_hash_new:
8973 case bfd_link_hash_warning:
8977 case bfd_link_hash_undefined:
8978 case bfd_link_hash_undefweak:
8979 input_sec = bfd_und_section_ptr;
8980 sym.st_shndx = SHN_UNDEF;
8983 case bfd_link_hash_defined:
8984 case bfd_link_hash_defweak:
8986 input_sec = h->root.u.def.section;
8987 if (input_sec->output_section != NULL)
8990 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
8991 input_sec->output_section);
8992 if (sym.st_shndx == SHN_BAD)
8994 (*_bfd_error_handler)
8995 (_("%B: could not find output section %A for input section %A"),
8996 flinfo->output_bfd, input_sec->output_section, input_sec);
8997 bfd_set_error (bfd_error_nonrepresentable_section);
8998 eoinfo->failed = TRUE;
9002 /* ELF symbols in relocatable files are section relative,
9003 but in nonrelocatable files they are virtual
9005 sym.st_value = h->root.u.def.value + input_sec->output_offset;
9006 if (!flinfo->info->relocatable)
9008 sym.st_value += input_sec->output_section->vma;
9009 if (h->type == STT_TLS)
9011 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
9012 if (tls_sec != NULL)
9013 sym.st_value -= tls_sec->vma;
9019 BFD_ASSERT (input_sec->owner == NULL
9020 || (input_sec->owner->flags & DYNAMIC) != 0);
9021 sym.st_shndx = SHN_UNDEF;
9022 input_sec = bfd_und_section_ptr;
9027 case bfd_link_hash_common:
9028 input_sec = h->root.u.c.p->section;
9029 sym.st_shndx = bed->common_section_index (input_sec);
9030 sym.st_value = 1 << h->root.u.c.p->alignment_power;
9033 case bfd_link_hash_indirect:
9034 /* These symbols are created by symbol versioning. They point
9035 to the decorated version of the name. For example, if the
9036 symbol foo@@GNU_1.2 is the default, which should be used when
9037 foo is used with no version, then we add an indirect symbol
9038 foo which points to foo@@GNU_1.2. We ignore these symbols,
9039 since the indirected symbol is already in the hash table. */
9043 /* Give the processor backend a chance to tweak the symbol value,
9044 and also to finish up anything that needs to be done for this
9045 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
9046 forced local syms when non-shared is due to a historical quirk.
9047 STT_GNU_IFUNC symbol must go through PLT. */
9048 if ((h->type == STT_GNU_IFUNC
9050 && !flinfo->info->relocatable)
9051 || ((h->dynindx != -1
9053 && ((flinfo->info->shared
9054 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
9055 || h->root.type != bfd_link_hash_undefweak))
9056 || !h->forced_local)
9057 && elf_hash_table (flinfo->info)->dynamic_sections_created))
9059 if (! ((*bed->elf_backend_finish_dynamic_symbol)
9060 (flinfo->output_bfd, flinfo->info, h, &sym)))
9062 eoinfo->failed = TRUE;
9067 /* If we are marking the symbol as undefined, and there are no
9068 non-weak references to this symbol from a regular object, then
9069 mark the symbol as weak undefined; if there are non-weak
9070 references, mark the symbol as strong. We can't do this earlier,
9071 because it might not be marked as undefined until the
9072 finish_dynamic_symbol routine gets through with it. */
9073 if (sym.st_shndx == SHN_UNDEF
9075 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
9076 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
9079 unsigned int type = ELF_ST_TYPE (sym.st_info);
9081 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
9082 if (type == STT_GNU_IFUNC)
9085 if (h->ref_regular_nonweak)
9086 bindtype = STB_GLOBAL;
9088 bindtype = STB_WEAK;
9089 sym.st_info = ELF_ST_INFO (bindtype, type);
9092 /* If this is a symbol defined in a dynamic library, don't use the
9093 symbol size from the dynamic library. Relinking an executable
9094 against a new library may introduce gratuitous changes in the
9095 executable's symbols if we keep the size. */
9096 if (sym.st_shndx == SHN_UNDEF
9101 /* If a non-weak symbol with non-default visibility is not defined
9102 locally, it is a fatal error. */
9103 if (!flinfo->info->relocatable
9104 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
9105 && ELF_ST_BIND (sym.st_info) != STB_WEAK
9106 && h->root.type == bfd_link_hash_undefined
9111 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
9112 msg = _("%B: protected symbol `%s' isn't defined");
9113 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
9114 msg = _("%B: internal symbol `%s' isn't defined");
9116 msg = _("%B: hidden symbol `%s' isn't defined");
9117 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
9118 bfd_set_error (bfd_error_bad_value);
9119 eoinfo->failed = TRUE;
9123 /* If this symbol should be put in the .dynsym section, then put it
9124 there now. We already know the symbol index. We also fill in
9125 the entry in the .hash section. */
9126 if (flinfo->dynsym_sec != NULL
9128 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9132 /* Since there is no version information in the dynamic string,
9133 if there is no version info in symbol version section, we will
9134 have a run-time problem. */
9135 if (h->verinfo.verdef == NULL)
9137 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9139 if (p && p [1] != '\0')
9141 (*_bfd_error_handler)
9142 (_("%B: No symbol version section for versioned symbol `%s'"),
9143 flinfo->output_bfd, h->root.root.string);
9144 eoinfo->failed = TRUE;
9149 sym.st_name = h->dynstr_index;
9150 esym = flinfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
9151 if (!check_dynsym (flinfo->output_bfd, &sym))
9153 eoinfo->failed = TRUE;
9156 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9158 if (flinfo->hash_sec != NULL)
9160 size_t hash_entry_size;
9161 bfd_byte *bucketpos;
9166 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9167 bucket = h->u.elf_hash_value % bucketcount;
9170 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9171 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9172 + (bucket + 2) * hash_entry_size);
9173 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9174 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9176 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9177 ((bfd_byte *) flinfo->hash_sec->contents
9178 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9181 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9183 Elf_Internal_Versym iversym;
9184 Elf_External_Versym *eversym;
9186 if (!h->def_regular)
9188 if (h->verinfo.verdef == NULL
9189 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
9190 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
9191 iversym.vs_vers = 0;
9193 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9197 if (h->verinfo.vertree == NULL)
9198 iversym.vs_vers = 1;
9200 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9201 if (flinfo->info->create_default_symver)
9206 iversym.vs_vers |= VERSYM_HIDDEN;
9208 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9209 eversym += h->dynindx;
9210 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9214 /* If the symbol is undefined, and we didn't output it to .dynsym,
9215 strip it from .symtab too. Obviously we can't do this for
9216 relocatable output or when needed for --emit-relocs. */
9217 else if (input_sec == bfd_und_section_ptr
9219 && !flinfo->info->relocatable)
9221 /* Also strip others that we couldn't earlier due to dynamic symbol
9225 if ((input_sec->flags & SEC_EXCLUDE) != 0)
9228 /* Output a FILE symbol so that following locals are not associated
9229 with the wrong input file. We need one for forced local symbols
9230 if we've seen more than one FILE symbol or when we have exactly
9231 one FILE symbol but global symbols are present in a file other
9232 than the one with the FILE symbol. We also need one if linker
9233 defined symbols are present. In practice these conditions are
9234 always met, so just emit the FILE symbol unconditionally. */
9235 if (eoinfo->localsyms
9236 && !eoinfo->file_sym_done
9237 && eoinfo->flinfo->filesym_count != 0)
9239 Elf_Internal_Sym fsym;
9241 memset (&fsym, 0, sizeof (fsym));
9242 fsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9243 fsym.st_shndx = SHN_ABS;
9244 if (!elf_link_output_sym (eoinfo->flinfo, NULL, &fsym,
9245 bfd_und_section_ptr, NULL))
9248 eoinfo->file_sym_done = TRUE;
9251 indx = bfd_get_symcount (flinfo->output_bfd);
9252 ret = elf_link_output_sym (flinfo, h->root.root.string, &sym, input_sec, h);
9255 eoinfo->failed = TRUE;
9260 else if (h->indx == -2)
9266 /* Return TRUE if special handling is done for relocs in SEC against
9267 symbols defined in discarded sections. */
9270 elf_section_ignore_discarded_relocs (asection *sec)
9272 const struct elf_backend_data *bed;
9274 switch (sec->sec_info_type)
9276 case SEC_INFO_TYPE_STABS:
9277 case SEC_INFO_TYPE_EH_FRAME:
9283 bed = get_elf_backend_data (sec->owner);
9284 if (bed->elf_backend_ignore_discarded_relocs != NULL
9285 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9291 /* Return a mask saying how ld should treat relocations in SEC against
9292 symbols defined in discarded sections. If this function returns
9293 COMPLAIN set, ld will issue a warning message. If this function
9294 returns PRETEND set, and the discarded section was link-once and the
9295 same size as the kept link-once section, ld will pretend that the
9296 symbol was actually defined in the kept section. Otherwise ld will
9297 zero the reloc (at least that is the intent, but some cooperation by
9298 the target dependent code is needed, particularly for REL targets). */
9301 _bfd_elf_default_action_discarded (asection *sec)
9303 if (sec->flags & SEC_DEBUGGING)
9306 if (strcmp (".eh_frame", sec->name) == 0)
9309 if (strcmp (".gcc_except_table", sec->name) == 0)
9312 return COMPLAIN | PRETEND;
9315 /* Find a match between a section and a member of a section group. */
9318 match_group_member (asection *sec, asection *group,
9319 struct bfd_link_info *info)
9321 asection *first = elf_next_in_group (group);
9322 asection *s = first;
9326 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9329 s = elf_next_in_group (s);
9337 /* Check if the kept section of a discarded section SEC can be used
9338 to replace it. Return the replacement if it is OK. Otherwise return
9342 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9346 kept = sec->kept_section;
9349 if ((kept->flags & SEC_GROUP) != 0)
9350 kept = match_group_member (sec, kept, info);
9352 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9353 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9355 sec->kept_section = kept;
9360 /* Link an input file into the linker output file. This function
9361 handles all the sections and relocations of the input file at once.
9362 This is so that we only have to read the local symbols once, and
9363 don't have to keep them in memory. */
9366 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9368 int (*relocate_section)
9369 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9370 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9372 Elf_Internal_Shdr *symtab_hdr;
9375 Elf_Internal_Sym *isymbuf;
9376 Elf_Internal_Sym *isym;
9377 Elf_Internal_Sym *isymend;
9379 asection **ppsection;
9381 const struct elf_backend_data *bed;
9382 struct elf_link_hash_entry **sym_hashes;
9383 bfd_size_type address_size;
9384 bfd_vma r_type_mask;
9386 bfd_boolean have_file_sym = FALSE;
9388 output_bfd = flinfo->output_bfd;
9389 bed = get_elf_backend_data (output_bfd);
9390 relocate_section = bed->elf_backend_relocate_section;
9392 /* If this is a dynamic object, we don't want to do anything here:
9393 we don't want the local symbols, and we don't want the section
9395 if ((input_bfd->flags & DYNAMIC) != 0)
9398 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9399 if (elf_bad_symtab (input_bfd))
9401 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9406 locsymcount = symtab_hdr->sh_info;
9407 extsymoff = symtab_hdr->sh_info;
9410 /* Read the local symbols. */
9411 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9412 if (isymbuf == NULL && locsymcount != 0)
9414 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9415 flinfo->internal_syms,
9416 flinfo->external_syms,
9417 flinfo->locsym_shndx);
9418 if (isymbuf == NULL)
9422 /* Find local symbol sections and adjust values of symbols in
9423 SEC_MERGE sections. Write out those local symbols we know are
9424 going into the output file. */
9425 isymend = isymbuf + locsymcount;
9426 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9428 isym++, pindex++, ppsection++)
9432 Elf_Internal_Sym osym;
9438 if (elf_bad_symtab (input_bfd))
9440 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9447 if (isym->st_shndx == SHN_UNDEF)
9448 isec = bfd_und_section_ptr;
9449 else if (isym->st_shndx == SHN_ABS)
9450 isec = bfd_abs_section_ptr;
9451 else if (isym->st_shndx == SHN_COMMON)
9452 isec = bfd_com_section_ptr;
9455 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9458 /* Don't attempt to output symbols with st_shnx in the
9459 reserved range other than SHN_ABS and SHN_COMMON. */
9463 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9464 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9466 _bfd_merged_section_offset (output_bfd, &isec,
9467 elf_section_data (isec)->sec_info,
9473 /* Don't output the first, undefined, symbol. In fact, don't
9474 output any undefined local symbol. */
9475 if (isec == bfd_und_section_ptr)
9478 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9480 /* We never output section symbols. Instead, we use the
9481 section symbol of the corresponding section in the output
9486 /* If we are stripping all symbols, we don't want to output this
9488 if (flinfo->info->strip == strip_all)
9491 /* If we are discarding all local symbols, we don't want to
9492 output this one. If we are generating a relocatable output
9493 file, then some of the local symbols may be required by
9494 relocs; we output them below as we discover that they are
9496 if (flinfo->info->discard == discard_all)
9499 /* If this symbol is defined in a section which we are
9500 discarding, we don't need to keep it. */
9501 if (isym->st_shndx != SHN_UNDEF
9502 && isym->st_shndx < SHN_LORESERVE
9503 && bfd_section_removed_from_list (output_bfd,
9504 isec->output_section))
9507 /* Get the name of the symbol. */
9508 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9513 /* See if we are discarding symbols with this name. */
9514 if ((flinfo->info->strip == strip_some
9515 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9517 || (((flinfo->info->discard == discard_sec_merge
9518 && (isec->flags & SEC_MERGE) && !flinfo->info->relocatable)
9519 || flinfo->info->discard == discard_l)
9520 && bfd_is_local_label_name (input_bfd, name)))
9523 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9525 if (input_bfd->lto_output)
9526 /* -flto puts a temp file name here. This means builds
9527 are not reproducible. Discard the symbol. */
9529 have_file_sym = TRUE;
9530 flinfo->filesym_count += 1;
9534 /* In the absence of debug info, bfd_find_nearest_line uses
9535 FILE symbols to determine the source file for local
9536 function symbols. Provide a FILE symbol here if input
9537 files lack such, so that their symbols won't be
9538 associated with a previous input file. It's not the
9539 source file, but the best we can do. */
9540 have_file_sym = TRUE;
9541 flinfo->filesym_count += 1;
9542 memset (&osym, 0, sizeof (osym));
9543 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9544 osym.st_shndx = SHN_ABS;
9545 if (!elf_link_output_sym (flinfo,
9546 (input_bfd->lto_output ? NULL
9547 : input_bfd->filename),
9548 &osym, bfd_abs_section_ptr, NULL))
9554 /* Adjust the section index for the output file. */
9555 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9556 isec->output_section);
9557 if (osym.st_shndx == SHN_BAD)
9560 /* ELF symbols in relocatable files are section relative, but
9561 in executable files they are virtual addresses. Note that
9562 this code assumes that all ELF sections have an associated
9563 BFD section with a reasonable value for output_offset; below
9564 we assume that they also have a reasonable value for
9565 output_section. Any special sections must be set up to meet
9566 these requirements. */
9567 osym.st_value += isec->output_offset;
9568 if (!flinfo->info->relocatable)
9570 osym.st_value += isec->output_section->vma;
9571 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9573 /* STT_TLS symbols are relative to PT_TLS segment base. */
9574 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9575 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9579 indx = bfd_get_symcount (output_bfd);
9580 ret = elf_link_output_sym (flinfo, name, &osym, isec, NULL);
9587 if (bed->s->arch_size == 32)
9595 r_type_mask = 0xffffffff;
9600 /* Relocate the contents of each section. */
9601 sym_hashes = elf_sym_hashes (input_bfd);
9602 for (o = input_bfd->sections; o != NULL; o = o->next)
9606 if (! o->linker_mark)
9608 /* This section was omitted from the link. */
9612 if (flinfo->info->relocatable
9613 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9615 /* Deal with the group signature symbol. */
9616 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9617 unsigned long symndx = sec_data->this_hdr.sh_info;
9618 asection *osec = o->output_section;
9620 if (symndx >= locsymcount
9621 || (elf_bad_symtab (input_bfd)
9622 && flinfo->sections[symndx] == NULL))
9624 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9625 while (h->root.type == bfd_link_hash_indirect
9626 || h->root.type == bfd_link_hash_warning)
9627 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9628 /* Arrange for symbol to be output. */
9630 elf_section_data (osec)->this_hdr.sh_info = -2;
9632 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9634 /* We'll use the output section target_index. */
9635 asection *sec = flinfo->sections[symndx]->output_section;
9636 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9640 if (flinfo->indices[symndx] == -1)
9642 /* Otherwise output the local symbol now. */
9643 Elf_Internal_Sym sym = isymbuf[symndx];
9644 asection *sec = flinfo->sections[symndx]->output_section;
9649 name = bfd_elf_string_from_elf_section (input_bfd,
9650 symtab_hdr->sh_link,
9655 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9657 if (sym.st_shndx == SHN_BAD)
9660 sym.st_value += o->output_offset;
9662 indx = bfd_get_symcount (output_bfd);
9663 ret = elf_link_output_sym (flinfo, name, &sym, o, NULL);
9667 flinfo->indices[symndx] = indx;
9671 elf_section_data (osec)->this_hdr.sh_info
9672 = flinfo->indices[symndx];
9676 if ((o->flags & SEC_HAS_CONTENTS) == 0
9677 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9680 if ((o->flags & SEC_LINKER_CREATED) != 0)
9682 /* Section was created by _bfd_elf_link_create_dynamic_sections
9687 /* Get the contents of the section. They have been cached by a
9688 relaxation routine. Note that o is a section in an input
9689 file, so the contents field will not have been set by any of
9690 the routines which work on output files. */
9691 if (elf_section_data (o)->this_hdr.contents != NULL)
9693 contents = elf_section_data (o)->this_hdr.contents;
9694 if (bed->caches_rawsize
9696 && o->rawsize < o->size)
9698 memcpy (flinfo->contents, contents, o->rawsize);
9699 contents = flinfo->contents;
9704 contents = flinfo->contents;
9705 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9709 if ((o->flags & SEC_RELOC) != 0)
9711 Elf_Internal_Rela *internal_relocs;
9712 Elf_Internal_Rela *rel, *relend;
9713 int action_discarded;
9716 /* Get the swapped relocs. */
9718 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
9719 flinfo->internal_relocs, FALSE);
9720 if (internal_relocs == NULL
9721 && o->reloc_count > 0)
9724 /* We need to reverse-copy input .ctors/.dtors sections if
9725 they are placed in .init_array/.finit_array for output. */
9726 if (o->size > address_size
9727 && ((strncmp (o->name, ".ctors", 6) == 0
9728 && strcmp (o->output_section->name,
9729 ".init_array") == 0)
9730 || (strncmp (o->name, ".dtors", 6) == 0
9731 && strcmp (o->output_section->name,
9732 ".fini_array") == 0))
9733 && (o->name[6] == 0 || o->name[6] == '.'))
9735 if (o->size != o->reloc_count * address_size)
9737 (*_bfd_error_handler)
9738 (_("error: %B: size of section %A is not "
9739 "multiple of address size"),
9741 bfd_set_error (bfd_error_on_input);
9744 o->flags |= SEC_ELF_REVERSE_COPY;
9747 action_discarded = -1;
9748 if (!elf_section_ignore_discarded_relocs (o))
9749 action_discarded = (*bed->action_discarded) (o);
9751 /* Run through the relocs evaluating complex reloc symbols and
9752 looking for relocs against symbols from discarded sections
9753 or section symbols from removed link-once sections.
9754 Complain about relocs against discarded sections. Zero
9755 relocs against removed link-once sections. */
9757 rel = internal_relocs;
9758 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9759 for ( ; rel < relend; rel++)
9761 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9762 unsigned int s_type;
9763 asection **ps, *sec;
9764 struct elf_link_hash_entry *h = NULL;
9765 const char *sym_name;
9767 if (r_symndx == STN_UNDEF)
9770 if (r_symndx >= locsymcount
9771 || (elf_bad_symtab (input_bfd)
9772 && flinfo->sections[r_symndx] == NULL))
9774 h = sym_hashes[r_symndx - extsymoff];
9776 /* Badly formatted input files can contain relocs that
9777 reference non-existant symbols. Check here so that
9778 we do not seg fault. */
9783 sprintf_vma (buffer, rel->r_info);
9784 (*_bfd_error_handler)
9785 (_("error: %B contains a reloc (0x%s) for section %A "
9786 "that references a non-existent global symbol"),
9787 input_bfd, o, buffer);
9788 bfd_set_error (bfd_error_bad_value);
9792 while (h->root.type == bfd_link_hash_indirect
9793 || h->root.type == bfd_link_hash_warning)
9794 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9798 /* If a plugin symbol is referenced from a non-IR file,
9799 mark the symbol as undefined. Note that the
9800 linker may attach linker created dynamic sections
9801 to the plugin bfd. Symbols defined in linker
9802 created sections are not plugin symbols. */
9803 if (h->root.non_ir_ref
9804 && (h->root.type == bfd_link_hash_defined
9805 || h->root.type == bfd_link_hash_defweak)
9806 && (h->root.u.def.section->flags
9807 & SEC_LINKER_CREATED) == 0
9808 && h->root.u.def.section->owner != NULL
9809 && (h->root.u.def.section->owner->flags
9812 h->root.type = bfd_link_hash_undefined;
9813 h->root.u.undef.abfd = h->root.u.def.section->owner;
9817 if (h->root.type == bfd_link_hash_defined
9818 || h->root.type == bfd_link_hash_defweak)
9819 ps = &h->root.u.def.section;
9821 sym_name = h->root.root.string;
9825 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9827 s_type = ELF_ST_TYPE (sym->st_info);
9828 ps = &flinfo->sections[r_symndx];
9829 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9833 if ((s_type == STT_RELC || s_type == STT_SRELC)
9834 && !flinfo->info->relocatable)
9837 bfd_vma dot = (rel->r_offset
9838 + o->output_offset + o->output_section->vma);
9840 printf ("Encountered a complex symbol!");
9841 printf (" (input_bfd %s, section %s, reloc %ld\n",
9842 input_bfd->filename, o->name,
9843 (long) (rel - internal_relocs));
9844 printf (" symbol: idx %8.8lx, name %s\n",
9845 r_symndx, sym_name);
9846 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9847 (unsigned long) rel->r_info,
9848 (unsigned long) rel->r_offset);
9850 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
9851 isymbuf, locsymcount, s_type == STT_SRELC))
9854 /* Symbol evaluated OK. Update to absolute value. */
9855 set_symbol_value (input_bfd, isymbuf, locsymcount,
9860 if (action_discarded != -1 && ps != NULL)
9862 /* Complain if the definition comes from a
9863 discarded section. */
9864 if ((sec = *ps) != NULL && discarded_section (sec))
9866 BFD_ASSERT (r_symndx != STN_UNDEF);
9867 if (action_discarded & COMPLAIN)
9868 (*flinfo->info->callbacks->einfo)
9869 (_("%X`%s' referenced in section `%A' of %B: "
9870 "defined in discarded section `%A' of %B\n"),
9871 sym_name, o, input_bfd, sec, sec->owner);
9873 /* Try to do the best we can to support buggy old
9874 versions of gcc. Pretend that the symbol is
9875 really defined in the kept linkonce section.
9876 FIXME: This is quite broken. Modifying the
9877 symbol here means we will be changing all later
9878 uses of the symbol, not just in this section. */
9879 if (action_discarded & PRETEND)
9883 kept = _bfd_elf_check_kept_section (sec,
9895 /* Relocate the section by invoking a back end routine.
9897 The back end routine is responsible for adjusting the
9898 section contents as necessary, and (if using Rela relocs
9899 and generating a relocatable output file) adjusting the
9900 reloc addend as necessary.
9902 The back end routine does not have to worry about setting
9903 the reloc address or the reloc symbol index.
9905 The back end routine is given a pointer to the swapped in
9906 internal symbols, and can access the hash table entries
9907 for the external symbols via elf_sym_hashes (input_bfd).
9909 When generating relocatable output, the back end routine
9910 must handle STB_LOCAL/STT_SECTION symbols specially. The
9911 output symbol is going to be a section symbol
9912 corresponding to the output section, which will require
9913 the addend to be adjusted. */
9915 ret = (*relocate_section) (output_bfd, flinfo->info,
9916 input_bfd, o, contents,
9924 || flinfo->info->relocatable
9925 || flinfo->info->emitrelocations)
9927 Elf_Internal_Rela *irela;
9928 Elf_Internal_Rela *irelaend, *irelamid;
9929 bfd_vma last_offset;
9930 struct elf_link_hash_entry **rel_hash;
9931 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
9932 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
9933 unsigned int next_erel;
9934 bfd_boolean rela_normal;
9935 struct bfd_elf_section_data *esdi, *esdo;
9937 esdi = elf_section_data (o);
9938 esdo = elf_section_data (o->output_section);
9939 rela_normal = FALSE;
9941 /* Adjust the reloc addresses and symbol indices. */
9943 irela = internal_relocs;
9944 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9945 rel_hash = esdo->rel.hashes + esdo->rel.count;
9946 /* We start processing the REL relocs, if any. When we reach
9947 IRELAMID in the loop, we switch to the RELA relocs. */
9949 if (esdi->rel.hdr != NULL)
9950 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
9951 * bed->s->int_rels_per_ext_rel);
9952 rel_hash_list = rel_hash;
9953 rela_hash_list = NULL;
9954 last_offset = o->output_offset;
9955 if (!flinfo->info->relocatable)
9956 last_offset += o->output_section->vma;
9957 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9959 unsigned long r_symndx;
9961 Elf_Internal_Sym sym;
9963 if (next_erel == bed->s->int_rels_per_ext_rel)
9969 if (irela == irelamid)
9971 rel_hash = esdo->rela.hashes + esdo->rela.count;
9972 rela_hash_list = rel_hash;
9973 rela_normal = bed->rela_normal;
9976 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9979 if (irela->r_offset >= (bfd_vma) -2)
9981 /* This is a reloc for a deleted entry or somesuch.
9982 Turn it into an R_*_NONE reloc, at the same
9983 offset as the last reloc. elf_eh_frame.c and
9984 bfd_elf_discard_info rely on reloc offsets
9986 irela->r_offset = last_offset;
9988 irela->r_addend = 0;
9992 irela->r_offset += o->output_offset;
9994 /* Relocs in an executable have to be virtual addresses. */
9995 if (!flinfo->info->relocatable)
9996 irela->r_offset += o->output_section->vma;
9998 last_offset = irela->r_offset;
10000 r_symndx = irela->r_info >> r_sym_shift;
10001 if (r_symndx == STN_UNDEF)
10004 if (r_symndx >= locsymcount
10005 || (elf_bad_symtab (input_bfd)
10006 && flinfo->sections[r_symndx] == NULL))
10008 struct elf_link_hash_entry *rh;
10009 unsigned long indx;
10011 /* This is a reloc against a global symbol. We
10012 have not yet output all the local symbols, so
10013 we do not know the symbol index of any global
10014 symbol. We set the rel_hash entry for this
10015 reloc to point to the global hash table entry
10016 for this symbol. The symbol index is then
10017 set at the end of bfd_elf_final_link. */
10018 indx = r_symndx - extsymoff;
10019 rh = elf_sym_hashes (input_bfd)[indx];
10020 while (rh->root.type == bfd_link_hash_indirect
10021 || rh->root.type == bfd_link_hash_warning)
10022 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
10024 /* Setting the index to -2 tells
10025 elf_link_output_extsym that this symbol is
10026 used by a reloc. */
10027 BFD_ASSERT (rh->indx < 0);
10035 /* This is a reloc against a local symbol. */
10038 sym = isymbuf[r_symndx];
10039 sec = flinfo->sections[r_symndx];
10040 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
10042 /* I suppose the backend ought to fill in the
10043 section of any STT_SECTION symbol against a
10044 processor specific section. */
10045 r_symndx = STN_UNDEF;
10046 if (bfd_is_abs_section (sec))
10048 else if (sec == NULL || sec->owner == NULL)
10050 bfd_set_error (bfd_error_bad_value);
10055 asection *osec = sec->output_section;
10057 /* If we have discarded a section, the output
10058 section will be the absolute section. In
10059 case of discarded SEC_MERGE sections, use
10060 the kept section. relocate_section should
10061 have already handled discarded linkonce
10063 if (bfd_is_abs_section (osec)
10064 && sec->kept_section != NULL
10065 && sec->kept_section->output_section != NULL)
10067 osec = sec->kept_section->output_section;
10068 irela->r_addend -= osec->vma;
10071 if (!bfd_is_abs_section (osec))
10073 r_symndx = osec->target_index;
10074 if (r_symndx == STN_UNDEF)
10076 irela->r_addend += osec->vma;
10077 osec = _bfd_nearby_section (output_bfd, osec,
10079 irela->r_addend -= osec->vma;
10080 r_symndx = osec->target_index;
10085 /* Adjust the addend according to where the
10086 section winds up in the output section. */
10088 irela->r_addend += sec->output_offset;
10092 if (flinfo->indices[r_symndx] == -1)
10094 unsigned long shlink;
10099 if (flinfo->info->strip == strip_all)
10101 /* You can't do ld -r -s. */
10102 bfd_set_error (bfd_error_invalid_operation);
10106 /* This symbol was skipped earlier, but
10107 since it is needed by a reloc, we
10108 must output it now. */
10109 shlink = symtab_hdr->sh_link;
10110 name = (bfd_elf_string_from_elf_section
10111 (input_bfd, shlink, sym.st_name));
10115 osec = sec->output_section;
10117 _bfd_elf_section_from_bfd_section (output_bfd,
10119 if (sym.st_shndx == SHN_BAD)
10122 sym.st_value += sec->output_offset;
10123 if (!flinfo->info->relocatable)
10125 sym.st_value += osec->vma;
10126 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
10128 /* STT_TLS symbols are relative to PT_TLS
10130 BFD_ASSERT (elf_hash_table (flinfo->info)
10131 ->tls_sec != NULL);
10132 sym.st_value -= (elf_hash_table (flinfo->info)
10137 indx = bfd_get_symcount (output_bfd);
10138 ret = elf_link_output_sym (flinfo, name, &sym, sec,
10143 flinfo->indices[r_symndx] = indx;
10148 r_symndx = flinfo->indices[r_symndx];
10151 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
10152 | (irela->r_info & r_type_mask));
10155 /* Swap out the relocs. */
10156 input_rel_hdr = esdi->rel.hdr;
10157 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
10159 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10164 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
10165 * bed->s->int_rels_per_ext_rel);
10166 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
10169 input_rela_hdr = esdi->rela.hdr;
10170 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
10172 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10181 /* Write out the modified section contents. */
10182 if (bed->elf_backend_write_section
10183 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
10186 /* Section written out. */
10188 else switch (o->sec_info_type)
10190 case SEC_INFO_TYPE_STABS:
10191 if (! (_bfd_write_section_stabs
10193 &elf_hash_table (flinfo->info)->stab_info,
10194 o, &elf_section_data (o)->sec_info, contents)))
10197 case SEC_INFO_TYPE_MERGE:
10198 if (! _bfd_write_merged_section (output_bfd, o,
10199 elf_section_data (o)->sec_info))
10202 case SEC_INFO_TYPE_EH_FRAME:
10204 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10211 /* FIXME: octets_per_byte. */
10212 if (! (o->flags & SEC_EXCLUDE))
10214 file_ptr offset = (file_ptr) o->output_offset;
10215 bfd_size_type todo = o->size;
10216 if ((o->flags & SEC_ELF_REVERSE_COPY))
10218 /* Reverse-copy input section to output. */
10221 todo -= address_size;
10222 if (! bfd_set_section_contents (output_bfd,
10230 offset += address_size;
10234 else if (! bfd_set_section_contents (output_bfd,
10248 /* Generate a reloc when linking an ELF file. This is a reloc
10249 requested by the linker, and does not come from any input file. This
10250 is used to build constructor and destructor tables when linking
10254 elf_reloc_link_order (bfd *output_bfd,
10255 struct bfd_link_info *info,
10256 asection *output_section,
10257 struct bfd_link_order *link_order)
10259 reloc_howto_type *howto;
10263 struct bfd_elf_section_reloc_data *reldata;
10264 struct elf_link_hash_entry **rel_hash_ptr;
10265 Elf_Internal_Shdr *rel_hdr;
10266 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10267 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10270 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10272 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10275 bfd_set_error (bfd_error_bad_value);
10279 addend = link_order->u.reloc.p->addend;
10282 reldata = &esdo->rel;
10283 else if (esdo->rela.hdr)
10284 reldata = &esdo->rela;
10291 /* Figure out the symbol index. */
10292 rel_hash_ptr = reldata->hashes + reldata->count;
10293 if (link_order->type == bfd_section_reloc_link_order)
10295 indx = link_order->u.reloc.p->u.section->target_index;
10296 BFD_ASSERT (indx != 0);
10297 *rel_hash_ptr = NULL;
10301 struct elf_link_hash_entry *h;
10303 /* Treat a reloc against a defined symbol as though it were
10304 actually against the section. */
10305 h = ((struct elf_link_hash_entry *)
10306 bfd_wrapped_link_hash_lookup (output_bfd, info,
10307 link_order->u.reloc.p->u.name,
10308 FALSE, FALSE, TRUE));
10310 && (h->root.type == bfd_link_hash_defined
10311 || h->root.type == bfd_link_hash_defweak))
10315 section = h->root.u.def.section;
10316 indx = section->output_section->target_index;
10317 *rel_hash_ptr = NULL;
10318 /* It seems that we ought to add the symbol value to the
10319 addend here, but in practice it has already been added
10320 because it was passed to constructor_callback. */
10321 addend += section->output_section->vma + section->output_offset;
10323 else if (h != NULL)
10325 /* Setting the index to -2 tells elf_link_output_extsym that
10326 this symbol is used by a reloc. */
10333 if (! ((*info->callbacks->unattached_reloc)
10334 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10340 /* If this is an inplace reloc, we must write the addend into the
10342 if (howto->partial_inplace && addend != 0)
10344 bfd_size_type size;
10345 bfd_reloc_status_type rstat;
10348 const char *sym_name;
10350 size = (bfd_size_type) bfd_get_reloc_size (howto);
10351 buf = (bfd_byte *) bfd_zmalloc (size);
10352 if (buf == NULL && size != 0)
10354 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10361 case bfd_reloc_outofrange:
10364 case bfd_reloc_overflow:
10365 if (link_order->type == bfd_section_reloc_link_order)
10366 sym_name = bfd_section_name (output_bfd,
10367 link_order->u.reloc.p->u.section);
10369 sym_name = link_order->u.reloc.p->u.name;
10370 if (! ((*info->callbacks->reloc_overflow)
10371 (info, NULL, sym_name, howto->name, addend, NULL,
10372 NULL, (bfd_vma) 0)))
10379 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10380 link_order->offset, size);
10386 /* The address of a reloc is relative to the section in a
10387 relocatable file, and is a virtual address in an executable
10389 offset = link_order->offset;
10390 if (! info->relocatable)
10391 offset += output_section->vma;
10393 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10395 irel[i].r_offset = offset;
10396 irel[i].r_info = 0;
10397 irel[i].r_addend = 0;
10399 if (bed->s->arch_size == 32)
10400 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10402 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10404 rel_hdr = reldata->hdr;
10405 erel = rel_hdr->contents;
10406 if (rel_hdr->sh_type == SHT_REL)
10408 erel += reldata->count * bed->s->sizeof_rel;
10409 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10413 irel[0].r_addend = addend;
10414 erel += reldata->count * bed->s->sizeof_rela;
10415 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10424 /* Get the output vma of the section pointed to by the sh_link field. */
10427 elf_get_linked_section_vma (struct bfd_link_order *p)
10429 Elf_Internal_Shdr **elf_shdrp;
10433 s = p->u.indirect.section;
10434 elf_shdrp = elf_elfsections (s->owner);
10435 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10436 elfsec = elf_shdrp[elfsec]->sh_link;
10438 The Intel C compiler generates SHT_IA_64_UNWIND with
10439 SHF_LINK_ORDER. But it doesn't set the sh_link or
10440 sh_info fields. Hence we could get the situation
10441 where elfsec is 0. */
10444 const struct elf_backend_data *bed
10445 = get_elf_backend_data (s->owner);
10446 if (bed->link_order_error_handler)
10447 bed->link_order_error_handler
10448 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10453 s = elf_shdrp[elfsec]->bfd_section;
10454 return s->output_section->vma + s->output_offset;
10459 /* Compare two sections based on the locations of the sections they are
10460 linked to. Used by elf_fixup_link_order. */
10463 compare_link_order (const void * a, const void * b)
10468 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10469 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10472 return apos > bpos;
10476 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10477 order as their linked sections. Returns false if this could not be done
10478 because an output section includes both ordered and unordered
10479 sections. Ideally we'd do this in the linker proper. */
10482 elf_fixup_link_order (bfd *abfd, asection *o)
10484 int seen_linkorder;
10487 struct bfd_link_order *p;
10489 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10491 struct bfd_link_order **sections;
10492 asection *s, *other_sec, *linkorder_sec;
10496 linkorder_sec = NULL;
10498 seen_linkorder = 0;
10499 for (p = o->map_head.link_order; p != NULL; p = p->next)
10501 if (p->type == bfd_indirect_link_order)
10503 s = p->u.indirect.section;
10505 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10506 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10507 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10508 && elfsec < elf_numsections (sub)
10509 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10510 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10524 if (seen_other && seen_linkorder)
10526 if (other_sec && linkorder_sec)
10527 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10529 linkorder_sec->owner, other_sec,
10532 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10534 bfd_set_error (bfd_error_bad_value);
10539 if (!seen_linkorder)
10542 sections = (struct bfd_link_order **)
10543 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10544 if (sections == NULL)
10546 seen_linkorder = 0;
10548 for (p = o->map_head.link_order; p != NULL; p = p->next)
10550 sections[seen_linkorder++] = p;
10552 /* Sort the input sections in the order of their linked section. */
10553 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10554 compare_link_order);
10556 /* Change the offsets of the sections. */
10558 for (n = 0; n < seen_linkorder; n++)
10560 s = sections[n]->u.indirect.section;
10561 offset &= ~(bfd_vma) 0 << s->alignment_power;
10562 s->output_offset = offset;
10563 sections[n]->offset = offset;
10564 /* FIXME: octets_per_byte. */
10565 offset += sections[n]->size;
10573 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10577 if (flinfo->symstrtab != NULL)
10578 _bfd_stringtab_free (flinfo->symstrtab);
10579 if (flinfo->contents != NULL)
10580 free (flinfo->contents);
10581 if (flinfo->external_relocs != NULL)
10582 free (flinfo->external_relocs);
10583 if (flinfo->internal_relocs != NULL)
10584 free (flinfo->internal_relocs);
10585 if (flinfo->external_syms != NULL)
10586 free (flinfo->external_syms);
10587 if (flinfo->locsym_shndx != NULL)
10588 free (flinfo->locsym_shndx);
10589 if (flinfo->internal_syms != NULL)
10590 free (flinfo->internal_syms);
10591 if (flinfo->indices != NULL)
10592 free (flinfo->indices);
10593 if (flinfo->sections != NULL)
10594 free (flinfo->sections);
10595 if (flinfo->symbuf != NULL)
10596 free (flinfo->symbuf);
10597 if (flinfo->symshndxbuf != NULL)
10598 free (flinfo->symshndxbuf);
10599 for (o = obfd->sections; o != NULL; o = o->next)
10601 struct bfd_elf_section_data *esdo = elf_section_data (o);
10602 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10603 free (esdo->rel.hashes);
10604 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10605 free (esdo->rela.hashes);
10609 /* Do the final step of an ELF link. */
10612 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10614 bfd_boolean dynamic;
10615 bfd_boolean emit_relocs;
10617 struct elf_final_link_info flinfo;
10619 struct bfd_link_order *p;
10621 bfd_size_type max_contents_size;
10622 bfd_size_type max_external_reloc_size;
10623 bfd_size_type max_internal_reloc_count;
10624 bfd_size_type max_sym_count;
10625 bfd_size_type max_sym_shndx_count;
10626 Elf_Internal_Sym elfsym;
10628 Elf_Internal_Shdr *symtab_hdr;
10629 Elf_Internal_Shdr *symtab_shndx_hdr;
10630 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10631 struct elf_outext_info eoinfo;
10632 bfd_boolean merged;
10633 size_t relativecount = 0;
10634 asection *reldyn = 0;
10636 asection *attr_section = NULL;
10637 bfd_vma attr_size = 0;
10638 const char *std_attrs_section;
10640 if (! is_elf_hash_table (info->hash))
10644 abfd->flags |= DYNAMIC;
10646 dynamic = elf_hash_table (info)->dynamic_sections_created;
10647 dynobj = elf_hash_table (info)->dynobj;
10649 emit_relocs = (info->relocatable
10650 || info->emitrelocations);
10652 flinfo.info = info;
10653 flinfo.output_bfd = abfd;
10654 flinfo.symstrtab = _bfd_elf_stringtab_init ();
10655 if (flinfo.symstrtab == NULL)
10660 flinfo.dynsym_sec = NULL;
10661 flinfo.hash_sec = NULL;
10662 flinfo.symver_sec = NULL;
10666 flinfo.dynsym_sec = bfd_get_linker_section (dynobj, ".dynsym");
10667 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
10668 /* Note that dynsym_sec can be NULL (on VMS). */
10669 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
10670 /* Note that it is OK if symver_sec is NULL. */
10673 flinfo.contents = NULL;
10674 flinfo.external_relocs = NULL;
10675 flinfo.internal_relocs = NULL;
10676 flinfo.external_syms = NULL;
10677 flinfo.locsym_shndx = NULL;
10678 flinfo.internal_syms = NULL;
10679 flinfo.indices = NULL;
10680 flinfo.sections = NULL;
10681 flinfo.symbuf = NULL;
10682 flinfo.symshndxbuf = NULL;
10683 flinfo.symbuf_count = 0;
10684 flinfo.shndxbuf_size = 0;
10685 flinfo.filesym_count = 0;
10687 /* The object attributes have been merged. Remove the input
10688 sections from the link, and set the contents of the output
10690 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10691 for (o = abfd->sections; o != NULL; o = o->next)
10693 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10694 || strcmp (o->name, ".gnu.attributes") == 0)
10696 for (p = o->map_head.link_order; p != NULL; p = p->next)
10698 asection *input_section;
10700 if (p->type != bfd_indirect_link_order)
10702 input_section = p->u.indirect.section;
10703 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10704 elf_link_input_bfd ignores this section. */
10705 input_section->flags &= ~SEC_HAS_CONTENTS;
10708 attr_size = bfd_elf_obj_attr_size (abfd);
10711 bfd_set_section_size (abfd, o, attr_size);
10713 /* Skip this section later on. */
10714 o->map_head.link_order = NULL;
10717 o->flags |= SEC_EXCLUDE;
10721 /* Count up the number of relocations we will output for each output
10722 section, so that we know the sizes of the reloc sections. We
10723 also figure out some maximum sizes. */
10724 max_contents_size = 0;
10725 max_external_reloc_size = 0;
10726 max_internal_reloc_count = 0;
10728 max_sym_shndx_count = 0;
10730 for (o = abfd->sections; o != NULL; o = o->next)
10732 struct bfd_elf_section_data *esdo = elf_section_data (o);
10733 o->reloc_count = 0;
10735 for (p = o->map_head.link_order; p != NULL; p = p->next)
10737 unsigned int reloc_count = 0;
10738 struct bfd_elf_section_data *esdi = NULL;
10740 if (p->type == bfd_section_reloc_link_order
10741 || p->type == bfd_symbol_reloc_link_order)
10743 else if (p->type == bfd_indirect_link_order)
10747 sec = p->u.indirect.section;
10748 esdi = elf_section_data (sec);
10750 /* Mark all sections which are to be included in the
10751 link. This will normally be every section. We need
10752 to do this so that we can identify any sections which
10753 the linker has decided to not include. */
10754 sec->linker_mark = TRUE;
10756 if (sec->flags & SEC_MERGE)
10759 if (esdo->this_hdr.sh_type == SHT_REL
10760 || esdo->this_hdr.sh_type == SHT_RELA)
10761 /* Some backends use reloc_count in relocation sections
10762 to count particular types of relocs. Of course,
10763 reloc sections themselves can't have relocations. */
10765 else if (info->relocatable || info->emitrelocations)
10766 reloc_count = sec->reloc_count;
10767 else if (bed->elf_backend_count_relocs)
10768 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10770 if (sec->rawsize > max_contents_size)
10771 max_contents_size = sec->rawsize;
10772 if (sec->size > max_contents_size)
10773 max_contents_size = sec->size;
10775 /* We are interested in just local symbols, not all
10777 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10778 && (sec->owner->flags & DYNAMIC) == 0)
10782 if (elf_bad_symtab (sec->owner))
10783 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10784 / bed->s->sizeof_sym);
10786 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10788 if (sym_count > max_sym_count)
10789 max_sym_count = sym_count;
10791 if (sym_count > max_sym_shndx_count
10792 && elf_symtab_shndx (sec->owner) != 0)
10793 max_sym_shndx_count = sym_count;
10795 if ((sec->flags & SEC_RELOC) != 0)
10797 size_t ext_size = 0;
10799 if (esdi->rel.hdr != NULL)
10800 ext_size = esdi->rel.hdr->sh_size;
10801 if (esdi->rela.hdr != NULL)
10802 ext_size += esdi->rela.hdr->sh_size;
10804 if (ext_size > max_external_reloc_size)
10805 max_external_reloc_size = ext_size;
10806 if (sec->reloc_count > max_internal_reloc_count)
10807 max_internal_reloc_count = sec->reloc_count;
10812 if (reloc_count == 0)
10815 o->reloc_count += reloc_count;
10817 if (p->type == bfd_indirect_link_order
10818 && (info->relocatable || info->emitrelocations))
10821 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
10822 if (esdi->rela.hdr)
10823 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
10828 esdo->rela.count += reloc_count;
10830 esdo->rel.count += reloc_count;
10834 if (o->reloc_count > 0)
10835 o->flags |= SEC_RELOC;
10838 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10839 set it (this is probably a bug) and if it is set
10840 assign_section_numbers will create a reloc section. */
10841 o->flags &=~ SEC_RELOC;
10844 /* If the SEC_ALLOC flag is not set, force the section VMA to
10845 zero. This is done in elf_fake_sections as well, but forcing
10846 the VMA to 0 here will ensure that relocs against these
10847 sections are handled correctly. */
10848 if ((o->flags & SEC_ALLOC) == 0
10849 && ! o->user_set_vma)
10853 if (! info->relocatable && merged)
10854 elf_link_hash_traverse (elf_hash_table (info),
10855 _bfd_elf_link_sec_merge_syms, abfd);
10857 /* Figure out the file positions for everything but the symbol table
10858 and the relocs. We set symcount to force assign_section_numbers
10859 to create a symbol table. */
10860 bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
10861 BFD_ASSERT (! abfd->output_has_begun);
10862 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10865 /* Set sizes, and assign file positions for reloc sections. */
10866 for (o = abfd->sections; o != NULL; o = o->next)
10868 struct bfd_elf_section_data *esdo = elf_section_data (o);
10869 if ((o->flags & SEC_RELOC) != 0)
10872 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
10876 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
10880 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10881 to count upwards while actually outputting the relocations. */
10882 esdo->rel.count = 0;
10883 esdo->rela.count = 0;
10886 /* We have now assigned file positions for all the sections except
10887 .symtab, .strtab, and non-loaded reloc sections. We start the
10888 .symtab section at the current file position, and write directly
10889 to it. We build the .strtab section in memory. */
10890 bfd_get_symcount (abfd) = 0;
10891 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10892 /* sh_name is set in prep_headers. */
10893 symtab_hdr->sh_type = SHT_SYMTAB;
10894 /* sh_flags, sh_addr and sh_size all start off zero. */
10895 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10896 /* sh_link is set in assign_section_numbers. */
10897 /* sh_info is set below. */
10898 /* sh_offset is set just below. */
10899 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10901 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10902 continuously seeking to the right position in the file. */
10903 if (! info->keep_memory || max_sym_count < 20)
10904 flinfo.symbuf_size = 20;
10906 flinfo.symbuf_size = max_sym_count;
10907 amt = flinfo.symbuf_size;
10908 amt *= bed->s->sizeof_sym;
10909 flinfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10910 if (flinfo.symbuf == NULL)
10912 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10914 /* Wild guess at number of output symbols. realloc'd as needed. */
10915 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10916 flinfo.shndxbuf_size = amt;
10917 amt *= sizeof (Elf_External_Sym_Shndx);
10918 flinfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10919 if (flinfo.symshndxbuf == NULL)
10923 if (info->strip != strip_all || emit_relocs)
10925 file_ptr off = elf_next_file_pos (abfd);
10927 _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10929 /* Note that at this point elf_next_file_pos (abfd) is
10930 incorrect. We do not yet know the size of the .symtab section.
10931 We correct next_file_pos below, after we do know the size. */
10933 /* Start writing out the symbol table. The first symbol is always a
10935 elfsym.st_value = 0;
10936 elfsym.st_size = 0;
10937 elfsym.st_info = 0;
10938 elfsym.st_other = 0;
10939 elfsym.st_shndx = SHN_UNDEF;
10940 elfsym.st_target_internal = 0;
10941 if (elf_link_output_sym (&flinfo, NULL, &elfsym, bfd_und_section_ptr,
10945 /* Output a symbol for each section. We output these even if we are
10946 discarding local symbols, since they are used for relocs. These
10947 symbols have no names. We store the index of each one in the
10948 index field of the section, so that we can find it again when
10949 outputting relocs. */
10951 elfsym.st_size = 0;
10952 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10953 elfsym.st_other = 0;
10954 elfsym.st_value = 0;
10955 elfsym.st_target_internal = 0;
10956 for (i = 1; i < elf_numsections (abfd); i++)
10958 o = bfd_section_from_elf_index (abfd, i);
10961 o->target_index = bfd_get_symcount (abfd);
10962 elfsym.st_shndx = i;
10963 if (!info->relocatable)
10964 elfsym.st_value = o->vma;
10965 if (elf_link_output_sym (&flinfo, NULL, &elfsym, o, NULL) != 1)
10971 /* Allocate some memory to hold information read in from the input
10973 if (max_contents_size != 0)
10975 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10976 if (flinfo.contents == NULL)
10980 if (max_external_reloc_size != 0)
10982 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
10983 if (flinfo.external_relocs == NULL)
10987 if (max_internal_reloc_count != 0)
10989 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10990 amt *= sizeof (Elf_Internal_Rela);
10991 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10992 if (flinfo.internal_relocs == NULL)
10996 if (max_sym_count != 0)
10998 amt = max_sym_count * bed->s->sizeof_sym;
10999 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
11000 if (flinfo.external_syms == NULL)
11003 amt = max_sym_count * sizeof (Elf_Internal_Sym);
11004 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
11005 if (flinfo.internal_syms == NULL)
11008 amt = max_sym_count * sizeof (long);
11009 flinfo.indices = (long int *) bfd_malloc (amt);
11010 if (flinfo.indices == NULL)
11013 amt = max_sym_count * sizeof (asection *);
11014 flinfo.sections = (asection **) bfd_malloc (amt);
11015 if (flinfo.sections == NULL)
11019 if (max_sym_shndx_count != 0)
11021 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
11022 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
11023 if (flinfo.locsym_shndx == NULL)
11027 if (elf_hash_table (info)->tls_sec)
11029 bfd_vma base, end = 0;
11032 for (sec = elf_hash_table (info)->tls_sec;
11033 sec && (sec->flags & SEC_THREAD_LOCAL);
11036 bfd_size_type size = sec->size;
11039 && (sec->flags & SEC_HAS_CONTENTS) == 0)
11041 struct bfd_link_order *ord = sec->map_tail.link_order;
11044 size = ord->offset + ord->size;
11046 end = sec->vma + size;
11048 base = elf_hash_table (info)->tls_sec->vma;
11049 /* Only align end of TLS section if static TLS doesn't have special
11050 alignment requirements. */
11051 if (bed->static_tls_alignment == 1)
11052 end = align_power (end,
11053 elf_hash_table (info)->tls_sec->alignment_power);
11054 elf_hash_table (info)->tls_size = end - base;
11057 /* Reorder SHF_LINK_ORDER sections. */
11058 for (o = abfd->sections; o != NULL; o = o->next)
11060 if (!elf_fixup_link_order (abfd, o))
11064 /* Since ELF permits relocations to be against local symbols, we
11065 must have the local symbols available when we do the relocations.
11066 Since we would rather only read the local symbols once, and we
11067 would rather not keep them in memory, we handle all the
11068 relocations for a single input file at the same time.
11070 Unfortunately, there is no way to know the total number of local
11071 symbols until we have seen all of them, and the local symbol
11072 indices precede the global symbol indices. This means that when
11073 we are generating relocatable output, and we see a reloc against
11074 a global symbol, we can not know the symbol index until we have
11075 finished examining all the local symbols to see which ones we are
11076 going to output. To deal with this, we keep the relocations in
11077 memory, and don't output them until the end of the link. This is
11078 an unfortunate waste of memory, but I don't see a good way around
11079 it. Fortunately, it only happens when performing a relocatable
11080 link, which is not the common case. FIXME: If keep_memory is set
11081 we could write the relocs out and then read them again; I don't
11082 know how bad the memory loss will be. */
11084 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11085 sub->output_has_begun = FALSE;
11086 for (o = abfd->sections; o != NULL; o = o->next)
11088 for (p = o->map_head.link_order; p != NULL; p = p->next)
11090 if (p->type == bfd_indirect_link_order
11091 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
11092 == bfd_target_elf_flavour)
11093 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
11095 if (! sub->output_has_begun)
11097 if (! elf_link_input_bfd (&flinfo, sub))
11099 sub->output_has_begun = TRUE;
11102 else if (p->type == bfd_section_reloc_link_order
11103 || p->type == bfd_symbol_reloc_link_order)
11105 if (! elf_reloc_link_order (abfd, info, o, p))
11110 if (! _bfd_default_link_order (abfd, info, o, p))
11112 if (p->type == bfd_indirect_link_order
11113 && (bfd_get_flavour (sub)
11114 == bfd_target_elf_flavour)
11115 && (elf_elfheader (sub)->e_ident[EI_CLASS]
11116 != bed->s->elfclass))
11118 const char *iclass, *oclass;
11120 if (bed->s->elfclass == ELFCLASS64)
11122 iclass = "ELFCLASS32";
11123 oclass = "ELFCLASS64";
11127 iclass = "ELFCLASS64";
11128 oclass = "ELFCLASS32";
11131 bfd_set_error (bfd_error_wrong_format);
11132 (*_bfd_error_handler)
11133 (_("%B: file class %s incompatible with %s"),
11134 sub, iclass, oclass);
11143 /* Free symbol buffer if needed. */
11144 if (!info->reduce_memory_overheads)
11146 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11147 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
11148 && elf_tdata (sub)->symbuf)
11150 free (elf_tdata (sub)->symbuf);
11151 elf_tdata (sub)->symbuf = NULL;
11155 /* Output any global symbols that got converted to local in a
11156 version script or due to symbol visibility. We do this in a
11157 separate step since ELF requires all local symbols to appear
11158 prior to any global symbols. FIXME: We should only do this if
11159 some global symbols were, in fact, converted to become local.
11160 FIXME: Will this work correctly with the Irix 5 linker? */
11161 eoinfo.failed = FALSE;
11162 eoinfo.flinfo = &flinfo;
11163 eoinfo.localsyms = TRUE;
11164 eoinfo.file_sym_done = FALSE;
11165 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11169 /* If backend needs to output some local symbols not present in the hash
11170 table, do it now. */
11171 if (bed->elf_backend_output_arch_local_syms
11172 && (info->strip != strip_all || emit_relocs))
11174 typedef int (*out_sym_func)
11175 (void *, const char *, Elf_Internal_Sym *, asection *,
11176 struct elf_link_hash_entry *);
11178 if (! ((*bed->elf_backend_output_arch_local_syms)
11179 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11183 /* That wrote out all the local symbols. Finish up the symbol table
11184 with the global symbols. Even if we want to strip everything we
11185 can, we still need to deal with those global symbols that got
11186 converted to local in a version script. */
11188 /* The sh_info field records the index of the first non local symbol. */
11189 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11192 && flinfo.dynsym_sec != NULL
11193 && flinfo.dynsym_sec->output_section != bfd_abs_section_ptr)
11195 Elf_Internal_Sym sym;
11196 bfd_byte *dynsym = flinfo.dynsym_sec->contents;
11197 long last_local = 0;
11199 /* Write out the section symbols for the output sections. */
11200 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
11206 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11208 sym.st_target_internal = 0;
11210 for (s = abfd->sections; s != NULL; s = s->next)
11216 dynindx = elf_section_data (s)->dynindx;
11219 indx = elf_section_data (s)->this_idx;
11220 BFD_ASSERT (indx > 0);
11221 sym.st_shndx = indx;
11222 if (! check_dynsym (abfd, &sym))
11224 sym.st_value = s->vma;
11225 dest = dynsym + dynindx * bed->s->sizeof_sym;
11226 if (last_local < dynindx)
11227 last_local = dynindx;
11228 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11232 /* Write out the local dynsyms. */
11233 if (elf_hash_table (info)->dynlocal)
11235 struct elf_link_local_dynamic_entry *e;
11236 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11241 /* Copy the internal symbol and turn off visibility.
11242 Note that we saved a word of storage and overwrote
11243 the original st_name with the dynstr_index. */
11245 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11247 s = bfd_section_from_elf_index (e->input_bfd,
11252 elf_section_data (s->output_section)->this_idx;
11253 if (! check_dynsym (abfd, &sym))
11255 sym.st_value = (s->output_section->vma
11257 + e->isym.st_value);
11260 if (last_local < e->dynindx)
11261 last_local = e->dynindx;
11263 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11264 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11268 elf_section_data (flinfo.dynsym_sec->output_section)->this_hdr.sh_info =
11272 /* We get the global symbols from the hash table. */
11273 eoinfo.failed = FALSE;
11274 eoinfo.localsyms = FALSE;
11275 eoinfo.flinfo = &flinfo;
11276 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11280 /* If backend needs to output some symbols not present in the hash
11281 table, do it now. */
11282 if (bed->elf_backend_output_arch_syms
11283 && (info->strip != strip_all || emit_relocs))
11285 typedef int (*out_sym_func)
11286 (void *, const char *, Elf_Internal_Sym *, asection *,
11287 struct elf_link_hash_entry *);
11289 if (! ((*bed->elf_backend_output_arch_syms)
11290 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11294 /* Flush all symbols to the file. */
11295 if (! elf_link_flush_output_syms (&flinfo, bed))
11298 /* Now we know the size of the symtab section. */
11299 if (bfd_get_symcount (abfd) > 0)
11301 /* Finish up and write out the symbol string table (.strtab)
11303 Elf_Internal_Shdr *symstrtab_hdr;
11304 file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
11306 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
11307 if (symtab_shndx_hdr->sh_name != 0)
11309 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11310 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11311 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11312 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11313 symtab_shndx_hdr->sh_size = amt;
11315 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11318 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11319 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11323 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11324 /* sh_name was set in prep_headers. */
11325 symstrtab_hdr->sh_type = SHT_STRTAB;
11326 symstrtab_hdr->sh_flags = 0;
11327 symstrtab_hdr->sh_addr = 0;
11328 symstrtab_hdr->sh_size = _bfd_stringtab_size (flinfo.symstrtab);
11329 symstrtab_hdr->sh_entsize = 0;
11330 symstrtab_hdr->sh_link = 0;
11331 symstrtab_hdr->sh_info = 0;
11332 /* sh_offset is set just below. */
11333 symstrtab_hdr->sh_addralign = 1;
11335 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
11337 elf_next_file_pos (abfd) = off;
11339 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11340 || ! _bfd_stringtab_emit (abfd, flinfo.symstrtab))
11344 /* Adjust the relocs to have the correct symbol indices. */
11345 for (o = abfd->sections; o != NULL; o = o->next)
11347 struct bfd_elf_section_data *esdo = elf_section_data (o);
11349 if ((o->flags & SEC_RELOC) == 0)
11352 sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o);
11353 if (esdo->rel.hdr != NULL)
11354 elf_link_adjust_relocs (abfd, &esdo->rel, sort);
11355 if (esdo->rela.hdr != NULL)
11356 elf_link_adjust_relocs (abfd, &esdo->rela, sort);
11358 /* Set the reloc_count field to 0 to prevent write_relocs from
11359 trying to swap the relocs out itself. */
11360 o->reloc_count = 0;
11363 if (dynamic && info->combreloc && dynobj != NULL)
11364 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11366 /* If we are linking against a dynamic object, or generating a
11367 shared library, finish up the dynamic linking information. */
11370 bfd_byte *dyncon, *dynconend;
11372 /* Fix up .dynamic entries. */
11373 o = bfd_get_linker_section (dynobj, ".dynamic");
11374 BFD_ASSERT (o != NULL);
11376 dyncon = o->contents;
11377 dynconend = o->contents + o->size;
11378 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11380 Elf_Internal_Dyn dyn;
11384 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11391 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11393 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11395 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11396 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11399 dyn.d_un.d_val = relativecount;
11406 name = info->init_function;
11409 name = info->fini_function;
11412 struct elf_link_hash_entry *h;
11414 h = elf_link_hash_lookup (elf_hash_table (info), name,
11415 FALSE, FALSE, TRUE);
11417 && (h->root.type == bfd_link_hash_defined
11418 || h->root.type == bfd_link_hash_defweak))
11420 dyn.d_un.d_ptr = h->root.u.def.value;
11421 o = h->root.u.def.section;
11422 if (o->output_section != NULL)
11423 dyn.d_un.d_ptr += (o->output_section->vma
11424 + o->output_offset);
11427 /* The symbol is imported from another shared
11428 library and does not apply to this one. */
11429 dyn.d_un.d_ptr = 0;
11436 case DT_PREINIT_ARRAYSZ:
11437 name = ".preinit_array";
11439 case DT_INIT_ARRAYSZ:
11440 name = ".init_array";
11442 case DT_FINI_ARRAYSZ:
11443 name = ".fini_array";
11445 o = bfd_get_section_by_name (abfd, name);
11448 (*_bfd_error_handler)
11449 (_("%B: could not find output section %s"), abfd, name);
11453 (*_bfd_error_handler)
11454 (_("warning: %s section has zero size"), name);
11455 dyn.d_un.d_val = o->size;
11458 case DT_PREINIT_ARRAY:
11459 name = ".preinit_array";
11461 case DT_INIT_ARRAY:
11462 name = ".init_array";
11464 case DT_FINI_ARRAY:
11465 name = ".fini_array";
11472 name = ".gnu.hash";
11481 name = ".gnu.version_d";
11484 name = ".gnu.version_r";
11487 name = ".gnu.version";
11489 o = bfd_get_section_by_name (abfd, name);
11492 (*_bfd_error_handler)
11493 (_("%B: could not find output section %s"), abfd, name);
11496 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11498 (*_bfd_error_handler)
11499 (_("warning: section '%s' is being made into a note"), name);
11500 bfd_set_error (bfd_error_nonrepresentable_section);
11503 dyn.d_un.d_ptr = o->vma;
11510 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11514 dyn.d_un.d_val = 0;
11515 dyn.d_un.d_ptr = 0;
11516 for (i = 1; i < elf_numsections (abfd); i++)
11518 Elf_Internal_Shdr *hdr;
11520 hdr = elf_elfsections (abfd)[i];
11521 if (hdr->sh_type == type
11522 && (hdr->sh_flags & SHF_ALLOC) != 0)
11524 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11525 dyn.d_un.d_val += hdr->sh_size;
11528 if (dyn.d_un.d_ptr == 0
11529 || hdr->sh_addr < dyn.d_un.d_ptr)
11530 dyn.d_un.d_ptr = hdr->sh_addr;
11536 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11540 /* If we have created any dynamic sections, then output them. */
11541 if (dynobj != NULL)
11543 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11546 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11547 if (((info->warn_shared_textrel && info->shared)
11548 || info->error_textrel)
11549 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11551 bfd_byte *dyncon, *dynconend;
11553 dyncon = o->contents;
11554 dynconend = o->contents + o->size;
11555 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11557 Elf_Internal_Dyn dyn;
11559 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11561 if (dyn.d_tag == DT_TEXTREL)
11563 if (info->error_textrel)
11564 info->callbacks->einfo
11565 (_("%P%X: read-only segment has dynamic relocations.\n"));
11567 info->callbacks->einfo
11568 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11574 for (o = dynobj->sections; o != NULL; o = o->next)
11576 if ((o->flags & SEC_HAS_CONTENTS) == 0
11578 || o->output_section == bfd_abs_section_ptr)
11580 if ((o->flags & SEC_LINKER_CREATED) == 0)
11582 /* At this point, we are only interested in sections
11583 created by _bfd_elf_link_create_dynamic_sections. */
11586 if (elf_hash_table (info)->stab_info.stabstr == o)
11588 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11590 if (strcmp (o->name, ".dynstr") != 0)
11592 /* FIXME: octets_per_byte. */
11593 if (! bfd_set_section_contents (abfd, o->output_section,
11595 (file_ptr) o->output_offset,
11601 /* The contents of the .dynstr section are actually in a
11605 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11606 if (bfd_seek (abfd, off, SEEK_SET) != 0
11607 || ! _bfd_elf_strtab_emit (abfd,
11608 elf_hash_table (info)->dynstr))
11614 if (info->relocatable)
11616 bfd_boolean failed = FALSE;
11618 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11623 /* If we have optimized stabs strings, output them. */
11624 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11626 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11630 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11633 elf_final_link_free (abfd, &flinfo);
11635 elf_linker (abfd) = TRUE;
11639 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11640 if (contents == NULL)
11641 return FALSE; /* Bail out and fail. */
11642 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11643 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11650 elf_final_link_free (abfd, &flinfo);
11654 /* Initialize COOKIE for input bfd ABFD. */
11657 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11658 struct bfd_link_info *info, bfd *abfd)
11660 Elf_Internal_Shdr *symtab_hdr;
11661 const struct elf_backend_data *bed;
11663 bed = get_elf_backend_data (abfd);
11664 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11666 cookie->abfd = abfd;
11667 cookie->sym_hashes = elf_sym_hashes (abfd);
11668 cookie->bad_symtab = elf_bad_symtab (abfd);
11669 if (cookie->bad_symtab)
11671 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11672 cookie->extsymoff = 0;
11676 cookie->locsymcount = symtab_hdr->sh_info;
11677 cookie->extsymoff = symtab_hdr->sh_info;
11680 if (bed->s->arch_size == 32)
11681 cookie->r_sym_shift = 8;
11683 cookie->r_sym_shift = 32;
11685 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11686 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11688 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11689 cookie->locsymcount, 0,
11691 if (cookie->locsyms == NULL)
11693 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11696 if (info->keep_memory)
11697 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11702 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11705 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11707 Elf_Internal_Shdr *symtab_hdr;
11709 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11710 if (cookie->locsyms != NULL
11711 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11712 free (cookie->locsyms);
11715 /* Initialize the relocation information in COOKIE for input section SEC
11716 of input bfd ABFD. */
11719 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11720 struct bfd_link_info *info, bfd *abfd,
11723 const struct elf_backend_data *bed;
11725 if (sec->reloc_count == 0)
11727 cookie->rels = NULL;
11728 cookie->relend = NULL;
11732 bed = get_elf_backend_data (abfd);
11734 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11735 info->keep_memory);
11736 if (cookie->rels == NULL)
11738 cookie->rel = cookie->rels;
11739 cookie->relend = (cookie->rels
11740 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11742 cookie->rel = cookie->rels;
11746 /* Free the memory allocated by init_reloc_cookie_rels,
11750 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11753 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11754 free (cookie->rels);
11757 /* Initialize the whole of COOKIE for input section SEC. */
11760 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11761 struct bfd_link_info *info,
11764 if (!init_reloc_cookie (cookie, info, sec->owner))
11766 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11771 fini_reloc_cookie (cookie, sec->owner);
11776 /* Free the memory allocated by init_reloc_cookie_for_section,
11780 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11783 fini_reloc_cookie_rels (cookie, sec);
11784 fini_reloc_cookie (cookie, sec->owner);
11787 /* Garbage collect unused sections. */
11789 /* Default gc_mark_hook. */
11792 _bfd_elf_gc_mark_hook (asection *sec,
11793 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11794 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11795 struct elf_link_hash_entry *h,
11796 Elf_Internal_Sym *sym)
11798 const char *sec_name;
11802 switch (h->root.type)
11804 case bfd_link_hash_defined:
11805 case bfd_link_hash_defweak:
11806 return h->root.u.def.section;
11808 case bfd_link_hash_common:
11809 return h->root.u.c.p->section;
11811 case bfd_link_hash_undefined:
11812 case bfd_link_hash_undefweak:
11813 /* To work around a glibc bug, keep all XXX input sections
11814 when there is an as yet undefined reference to __start_XXX
11815 or __stop_XXX symbols. The linker will later define such
11816 symbols for orphan input sections that have a name
11817 representable as a C identifier. */
11818 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11819 sec_name = h->root.root.string + 8;
11820 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11821 sec_name = h->root.root.string + 7;
11825 if (sec_name && *sec_name != '\0')
11829 for (i = info->input_bfds; i; i = i->link.next)
11831 sec = bfd_get_section_by_name (i, sec_name);
11833 sec->flags |= SEC_KEEP;
11843 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11848 /* COOKIE->rel describes a relocation against section SEC, which is
11849 a section we've decided to keep. Return the section that contains
11850 the relocation symbol, or NULL if no section contains it. */
11853 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11854 elf_gc_mark_hook_fn gc_mark_hook,
11855 struct elf_reloc_cookie *cookie)
11857 unsigned long r_symndx;
11858 struct elf_link_hash_entry *h;
11860 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11861 if (r_symndx == STN_UNDEF)
11864 if (r_symndx >= cookie->locsymcount
11865 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11867 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11870 info->callbacks->einfo (_("%F%P: corrupt input: %B\n"),
11874 while (h->root.type == bfd_link_hash_indirect
11875 || h->root.type == bfd_link_hash_warning)
11876 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11878 /* If this symbol is weak and there is a non-weak definition, we
11879 keep the non-weak definition because many backends put
11880 dynamic reloc info on the non-weak definition for code
11881 handling copy relocs. */
11882 if (h->u.weakdef != NULL)
11883 h->u.weakdef->mark = 1;
11884 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11887 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11888 &cookie->locsyms[r_symndx]);
11891 /* COOKIE->rel describes a relocation against section SEC, which is
11892 a section we've decided to keep. Mark the section that contains
11893 the relocation symbol. */
11896 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11898 elf_gc_mark_hook_fn gc_mark_hook,
11899 struct elf_reloc_cookie *cookie)
11903 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11904 if (rsec && !rsec->gc_mark)
11906 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
11907 || (rsec->owner->flags & DYNAMIC) != 0)
11909 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11915 /* The mark phase of garbage collection. For a given section, mark
11916 it and any sections in this section's group, and all the sections
11917 which define symbols to which it refers. */
11920 _bfd_elf_gc_mark (struct bfd_link_info *info,
11922 elf_gc_mark_hook_fn gc_mark_hook)
11925 asection *group_sec, *eh_frame;
11929 /* Mark all the sections in the group. */
11930 group_sec = elf_section_data (sec)->next_in_group;
11931 if (group_sec && !group_sec->gc_mark)
11932 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11935 /* Look through the section relocs. */
11937 eh_frame = elf_eh_frame_section (sec->owner);
11938 if ((sec->flags & SEC_RELOC) != 0
11939 && sec->reloc_count > 0
11940 && sec != eh_frame)
11942 struct elf_reloc_cookie cookie;
11944 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11948 for (; cookie.rel < cookie.relend; cookie.rel++)
11949 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11954 fini_reloc_cookie_for_section (&cookie, sec);
11958 if (ret && eh_frame && elf_fde_list (sec))
11960 struct elf_reloc_cookie cookie;
11962 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11966 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11967 gc_mark_hook, &cookie))
11969 fini_reloc_cookie_for_section (&cookie, eh_frame);
11976 /* Scan and mark sections in a special or debug section group. */
11979 _bfd_elf_gc_mark_debug_special_section_group (asection *grp)
11981 /* Point to first section of section group. */
11983 /* Used to iterate the section group. */
11986 bfd_boolean is_special_grp = TRUE;
11987 bfd_boolean is_debug_grp = TRUE;
11989 /* First scan to see if group contains any section other than debug
11990 and special section. */
11991 ssec = msec = elf_next_in_group (grp);
11994 if ((msec->flags & SEC_DEBUGGING) == 0)
11995 is_debug_grp = FALSE;
11997 if ((msec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) != 0)
11998 is_special_grp = FALSE;
12000 msec = elf_next_in_group (msec);
12002 while (msec != ssec);
12004 /* If this is a pure debug section group or pure special section group,
12005 keep all sections in this group. */
12006 if (is_debug_grp || is_special_grp)
12011 msec = elf_next_in_group (msec);
12013 while (msec != ssec);
12017 /* Keep debug and special sections. */
12020 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
12021 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
12025 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12028 bfd_boolean some_kept;
12029 bfd_boolean debug_frag_seen;
12031 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12034 /* Ensure all linker created sections are kept,
12035 see if any other section is already marked,
12036 and note if we have any fragmented debug sections. */
12037 debug_frag_seen = some_kept = FALSE;
12038 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12040 if ((isec->flags & SEC_LINKER_CREATED) != 0)
12042 else if (isec->gc_mark)
12045 if (debug_frag_seen == FALSE
12046 && (isec->flags & SEC_DEBUGGING)
12047 && CONST_STRNEQ (isec->name, ".debug_line."))
12048 debug_frag_seen = TRUE;
12051 /* If no section in this file will be kept, then we can
12052 toss out the debug and special sections. */
12056 /* Keep debug and special sections like .comment when they are
12057 not part of a group. Also keep section groups that contain
12058 just debug sections or special sections. */
12059 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12061 if ((isec->flags & SEC_GROUP) != 0)
12062 _bfd_elf_gc_mark_debug_special_section_group (isec);
12063 else if (((isec->flags & SEC_DEBUGGING) != 0
12064 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
12065 && elf_next_in_group (isec) == NULL)
12069 if (! debug_frag_seen)
12072 /* Look for CODE sections which are going to be discarded,
12073 and find and discard any fragmented debug sections which
12074 are associated with that code section. */
12075 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12076 if ((isec->flags & SEC_CODE) != 0
12077 && isec->gc_mark == 0)
12082 ilen = strlen (isec->name);
12084 /* Association is determined by the name of the debug section
12085 containing the name of the code section as a suffix. For
12086 example .debug_line.text.foo is a debug section associated
12088 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
12092 if (dsec->gc_mark == 0
12093 || (dsec->flags & SEC_DEBUGGING) == 0)
12096 dlen = strlen (dsec->name);
12099 && strncmp (dsec->name + (dlen - ilen),
12100 isec->name, ilen) == 0)
12110 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
12112 struct elf_gc_sweep_symbol_info
12114 struct bfd_link_info *info;
12115 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
12120 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
12123 && (((h->root.type == bfd_link_hash_defined
12124 || h->root.type == bfd_link_hash_defweak)
12125 && !((h->def_regular || ELF_COMMON_DEF_P (h))
12126 && h->root.u.def.section->gc_mark))
12127 || h->root.type == bfd_link_hash_undefined
12128 || h->root.type == bfd_link_hash_undefweak))
12130 struct elf_gc_sweep_symbol_info *inf;
12132 inf = (struct elf_gc_sweep_symbol_info *) data;
12133 (*inf->hide_symbol) (inf->info, h, TRUE);
12134 h->def_regular = 0;
12135 h->ref_regular = 0;
12136 h->ref_regular_nonweak = 0;
12142 /* The sweep phase of garbage collection. Remove all garbage sections. */
12144 typedef bfd_boolean (*gc_sweep_hook_fn)
12145 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
12148 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
12151 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12152 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
12153 unsigned long section_sym_count;
12154 struct elf_gc_sweep_symbol_info sweep_info;
12156 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12160 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12161 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12164 for (o = sub->sections; o != NULL; o = o->next)
12166 /* When any section in a section group is kept, we keep all
12167 sections in the section group. If the first member of
12168 the section group is excluded, we will also exclude the
12170 if (o->flags & SEC_GROUP)
12172 asection *first = elf_next_in_group (o);
12173 o->gc_mark = first->gc_mark;
12179 /* Skip sweeping sections already excluded. */
12180 if (o->flags & SEC_EXCLUDE)
12183 /* Since this is early in the link process, it is simple
12184 to remove a section from the output. */
12185 o->flags |= SEC_EXCLUDE;
12187 if (info->print_gc_sections && o->size != 0)
12188 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
12190 /* But we also have to update some of the relocation
12191 info we collected before. */
12193 && (o->flags & SEC_RELOC) != 0
12194 && o->reloc_count != 0
12195 && !((info->strip == strip_all || info->strip == strip_debugger)
12196 && (o->flags & SEC_DEBUGGING) != 0)
12197 && !bfd_is_abs_section (o->output_section))
12199 Elf_Internal_Rela *internal_relocs;
12203 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
12204 info->keep_memory);
12205 if (internal_relocs == NULL)
12208 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
12210 if (elf_section_data (o)->relocs != internal_relocs)
12211 free (internal_relocs);
12219 /* Remove the symbols that were in the swept sections from the dynamic
12220 symbol table. GCFIXME: Anyone know how to get them out of the
12221 static symbol table as well? */
12222 sweep_info.info = info;
12223 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
12224 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
12227 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
12231 /* Propagate collected vtable information. This is called through
12232 elf_link_hash_traverse. */
12235 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
12237 /* Those that are not vtables. */
12238 if (h->vtable == NULL || h->vtable->parent == NULL)
12241 /* Those vtables that do not have parents, we cannot merge. */
12242 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12245 /* If we've already been done, exit. */
12246 if (h->vtable->used && h->vtable->used[-1])
12249 /* Make sure the parent's table is up to date. */
12250 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12252 if (h->vtable->used == NULL)
12254 /* None of this table's entries were referenced. Re-use the
12256 h->vtable->used = h->vtable->parent->vtable->used;
12257 h->vtable->size = h->vtable->parent->vtable->size;
12262 bfd_boolean *cu, *pu;
12264 /* Or the parent's entries into ours. */
12265 cu = h->vtable->used;
12267 pu = h->vtable->parent->vtable->used;
12270 const struct elf_backend_data *bed;
12271 unsigned int log_file_align;
12273 bed = get_elf_backend_data (h->root.u.def.section->owner);
12274 log_file_align = bed->s->log_file_align;
12275 n = h->vtable->parent->vtable->size >> log_file_align;
12290 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12293 bfd_vma hstart, hend;
12294 Elf_Internal_Rela *relstart, *relend, *rel;
12295 const struct elf_backend_data *bed;
12296 unsigned int log_file_align;
12298 /* Take care of both those symbols that do not describe vtables as
12299 well as those that are not loaded. */
12300 if (h->vtable == NULL || h->vtable->parent == NULL)
12303 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12304 || h->root.type == bfd_link_hash_defweak);
12306 sec = h->root.u.def.section;
12307 hstart = h->root.u.def.value;
12308 hend = hstart + h->size;
12310 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12312 return *(bfd_boolean *) okp = FALSE;
12313 bed = get_elf_backend_data (sec->owner);
12314 log_file_align = bed->s->log_file_align;
12316 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12318 for (rel = relstart; rel < relend; ++rel)
12319 if (rel->r_offset >= hstart && rel->r_offset < hend)
12321 /* If the entry is in use, do nothing. */
12322 if (h->vtable->used
12323 && (rel->r_offset - hstart) < h->vtable->size)
12325 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12326 if (h->vtable->used[entry])
12329 /* Otherwise, kill it. */
12330 rel->r_offset = rel->r_info = rel->r_addend = 0;
12336 /* Mark sections containing dynamically referenced symbols. When
12337 building shared libraries, we must assume that any visible symbol is
12341 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12343 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12344 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12346 if ((h->root.type == bfd_link_hash_defined
12347 || h->root.type == bfd_link_hash_defweak)
12349 || ((h->def_regular || ELF_COMMON_DEF_P (h))
12350 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12351 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12352 && (!info->executable
12353 || info->export_dynamic
12356 && (*d->match) (&d->head, NULL, h->root.root.string)))
12357 && (strchr (h->root.root.string, ELF_VER_CHR) != NULL
12358 || !bfd_hide_sym_by_version (info->version_info,
12359 h->root.root.string)))))
12360 h->root.u.def.section->flags |= SEC_KEEP;
12365 /* Keep all sections containing symbols undefined on the command-line,
12366 and the section containing the entry symbol. */
12369 _bfd_elf_gc_keep (struct bfd_link_info *info)
12371 struct bfd_sym_chain *sym;
12373 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12375 struct elf_link_hash_entry *h;
12377 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12378 FALSE, FALSE, FALSE);
12381 && (h->root.type == bfd_link_hash_defined
12382 || h->root.type == bfd_link_hash_defweak)
12383 && !bfd_is_abs_section (h->root.u.def.section))
12384 h->root.u.def.section->flags |= SEC_KEEP;
12388 /* Do mark and sweep of unused sections. */
12391 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12393 bfd_boolean ok = TRUE;
12395 elf_gc_mark_hook_fn gc_mark_hook;
12396 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12397 struct elf_link_hash_table *htab;
12399 if (!bed->can_gc_sections
12400 || !is_elf_hash_table (info->hash))
12402 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12406 bed->gc_keep (info);
12407 htab = elf_hash_table (info);
12409 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12410 at the .eh_frame section if we can mark the FDEs individually. */
12411 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12414 struct elf_reloc_cookie cookie;
12416 sec = bfd_get_section_by_name (sub, ".eh_frame");
12417 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12419 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12420 if (elf_section_data (sec)->sec_info
12421 && (sec->flags & SEC_LINKER_CREATED) == 0)
12422 elf_eh_frame_section (sub) = sec;
12423 fini_reloc_cookie_for_section (&cookie, sec);
12424 sec = bfd_get_next_section_by_name (sec);
12428 /* Apply transitive closure to the vtable entry usage info. */
12429 elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
12433 /* Kill the vtable relocations that were not used. */
12434 elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
12438 /* Mark dynamically referenced symbols. */
12439 if (htab->dynamic_sections_created)
12440 elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
12442 /* Grovel through relocs to find out who stays ... */
12443 gc_mark_hook = bed->gc_mark_hook;
12444 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12448 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12449 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12452 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12453 Also treat note sections as a root, if the section is not part
12455 for (o = sub->sections; o != NULL; o = o->next)
12457 && (o->flags & SEC_EXCLUDE) == 0
12458 && ((o->flags & SEC_KEEP) != 0
12459 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12460 && elf_next_in_group (o) == NULL )))
12462 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12467 /* Allow the backend to mark additional target specific sections. */
12468 bed->gc_mark_extra_sections (info, gc_mark_hook);
12470 /* ... and mark SEC_EXCLUDE for those that go. */
12471 return elf_gc_sweep (abfd, info);
12474 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12477 bfd_elf_gc_record_vtinherit (bfd *abfd,
12479 struct elf_link_hash_entry *h,
12482 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12483 struct elf_link_hash_entry **search, *child;
12484 bfd_size_type extsymcount;
12485 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12487 /* The sh_info field of the symtab header tells us where the
12488 external symbols start. We don't care about the local symbols at
12490 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12491 if (!elf_bad_symtab (abfd))
12492 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12494 sym_hashes = elf_sym_hashes (abfd);
12495 sym_hashes_end = sym_hashes + extsymcount;
12497 /* Hunt down the child symbol, which is in this section at the same
12498 offset as the relocation. */
12499 for (search = sym_hashes; search != sym_hashes_end; ++search)
12501 if ((child = *search) != NULL
12502 && (child->root.type == bfd_link_hash_defined
12503 || child->root.type == bfd_link_hash_defweak)
12504 && child->root.u.def.section == sec
12505 && child->root.u.def.value == offset)
12509 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12510 abfd, sec, (unsigned long) offset);
12511 bfd_set_error (bfd_error_invalid_operation);
12515 if (!child->vtable)
12517 child->vtable = ((struct elf_link_virtual_table_entry *)
12518 bfd_zalloc (abfd, sizeof (*child->vtable)));
12519 if (!child->vtable)
12524 /* This *should* only be the absolute section. It could potentially
12525 be that someone has defined a non-global vtable though, which
12526 would be bad. It isn't worth paging in the local symbols to be
12527 sure though; that case should simply be handled by the assembler. */
12529 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12532 child->vtable->parent = h;
12537 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12540 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12541 asection *sec ATTRIBUTE_UNUSED,
12542 struct elf_link_hash_entry *h,
12545 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12546 unsigned int log_file_align = bed->s->log_file_align;
12550 h->vtable = ((struct elf_link_virtual_table_entry *)
12551 bfd_zalloc (abfd, sizeof (*h->vtable)));
12556 if (addend >= h->vtable->size)
12558 size_t size, bytes, file_align;
12559 bfd_boolean *ptr = h->vtable->used;
12561 /* While the symbol is undefined, we have to be prepared to handle
12563 file_align = 1 << log_file_align;
12564 if (h->root.type == bfd_link_hash_undefined)
12565 size = addend + file_align;
12569 if (addend >= size)
12571 /* Oops! We've got a reference past the defined end of
12572 the table. This is probably a bug -- shall we warn? */
12573 size = addend + file_align;
12576 size = (size + file_align - 1) & -file_align;
12578 /* Allocate one extra entry for use as a "done" flag for the
12579 consolidation pass. */
12580 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12584 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12590 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12591 * sizeof (bfd_boolean));
12592 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12596 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12601 /* And arrange for that done flag to be at index -1. */
12602 h->vtable->used = ptr + 1;
12603 h->vtable->size = size;
12606 h->vtable->used[addend >> log_file_align] = TRUE;
12611 /* Map an ELF section header flag to its corresponding string. */
12615 flagword flag_value;
12616 } elf_flags_to_name_table;
12618 static elf_flags_to_name_table elf_flags_to_names [] =
12620 { "SHF_WRITE", SHF_WRITE },
12621 { "SHF_ALLOC", SHF_ALLOC },
12622 { "SHF_EXECINSTR", SHF_EXECINSTR },
12623 { "SHF_MERGE", SHF_MERGE },
12624 { "SHF_STRINGS", SHF_STRINGS },
12625 { "SHF_INFO_LINK", SHF_INFO_LINK},
12626 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
12627 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
12628 { "SHF_GROUP", SHF_GROUP },
12629 { "SHF_TLS", SHF_TLS },
12630 { "SHF_MASKOS", SHF_MASKOS },
12631 { "SHF_EXCLUDE", SHF_EXCLUDE },
12634 /* Returns TRUE if the section is to be included, otherwise FALSE. */
12636 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
12637 struct flag_info *flaginfo,
12640 const bfd_vma sh_flags = elf_section_flags (section);
12642 if (!flaginfo->flags_initialized)
12644 bfd *obfd = info->output_bfd;
12645 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12646 struct flag_info_list *tf = flaginfo->flag_list;
12648 int without_hex = 0;
12650 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
12653 flagword (*lookup) (char *);
12655 lookup = bed->elf_backend_lookup_section_flags_hook;
12656 if (lookup != NULL)
12658 flagword hexval = (*lookup) ((char *) tf->name);
12662 if (tf->with == with_flags)
12663 with_hex |= hexval;
12664 else if (tf->with == without_flags)
12665 without_hex |= hexval;
12670 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
12672 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
12674 if (tf->with == with_flags)
12675 with_hex |= elf_flags_to_names[i].flag_value;
12676 else if (tf->with == without_flags)
12677 without_hex |= elf_flags_to_names[i].flag_value;
12684 info->callbacks->einfo
12685 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
12689 flaginfo->flags_initialized = TRUE;
12690 flaginfo->only_with_flags |= with_hex;
12691 flaginfo->not_with_flags |= without_hex;
12694 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
12697 if ((flaginfo->not_with_flags & sh_flags) != 0)
12703 struct alloc_got_off_arg {
12705 struct bfd_link_info *info;
12708 /* We need a special top-level link routine to convert got reference counts
12709 to real got offsets. */
12712 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12714 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12715 bfd *obfd = gofarg->info->output_bfd;
12716 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12718 if (h->got.refcount > 0)
12720 h->got.offset = gofarg->gotoff;
12721 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12724 h->got.offset = (bfd_vma) -1;
12729 /* And an accompanying bit to work out final got entry offsets once
12730 we're done. Should be called from final_link. */
12733 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12734 struct bfd_link_info *info)
12737 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12739 struct alloc_got_off_arg gofarg;
12741 BFD_ASSERT (abfd == info->output_bfd);
12743 if (! is_elf_hash_table (info->hash))
12746 /* The GOT offset is relative to the .got section, but the GOT header is
12747 put into the .got.plt section, if the backend uses it. */
12748 if (bed->want_got_plt)
12751 gotoff = bed->got_header_size;
12753 /* Do the local .got entries first. */
12754 for (i = info->input_bfds; i; i = i->link.next)
12756 bfd_signed_vma *local_got;
12757 bfd_size_type j, locsymcount;
12758 Elf_Internal_Shdr *symtab_hdr;
12760 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12763 local_got = elf_local_got_refcounts (i);
12767 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12768 if (elf_bad_symtab (i))
12769 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12771 locsymcount = symtab_hdr->sh_info;
12773 for (j = 0; j < locsymcount; ++j)
12775 if (local_got[j] > 0)
12777 local_got[j] = gotoff;
12778 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12781 local_got[j] = (bfd_vma) -1;
12785 /* Then the global .got entries. .plt refcounts are handled by
12786 adjust_dynamic_symbol */
12787 gofarg.gotoff = gotoff;
12788 gofarg.info = info;
12789 elf_link_hash_traverse (elf_hash_table (info),
12790 elf_gc_allocate_got_offsets,
12795 /* Many folk need no more in the way of final link than this, once
12796 got entry reference counting is enabled. */
12799 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12801 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12804 /* Invoke the regular ELF backend linker to do all the work. */
12805 return bfd_elf_final_link (abfd, info);
12809 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12811 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12813 if (rcookie->bad_symtab)
12814 rcookie->rel = rcookie->rels;
12816 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12818 unsigned long r_symndx;
12820 if (! rcookie->bad_symtab)
12821 if (rcookie->rel->r_offset > offset)
12823 if (rcookie->rel->r_offset != offset)
12826 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12827 if (r_symndx == STN_UNDEF)
12830 if (r_symndx >= rcookie->locsymcount
12831 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12833 struct elf_link_hash_entry *h;
12835 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12837 while (h->root.type == bfd_link_hash_indirect
12838 || h->root.type == bfd_link_hash_warning)
12839 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12841 if ((h->root.type == bfd_link_hash_defined
12842 || h->root.type == bfd_link_hash_defweak)
12843 && (h->root.u.def.section->owner != rcookie->abfd
12844 || h->root.u.def.section->kept_section != NULL
12845 || discarded_section (h->root.u.def.section)))
12850 /* It's not a relocation against a global symbol,
12851 but it could be a relocation against a local
12852 symbol for a discarded section. */
12854 Elf_Internal_Sym *isym;
12856 /* Need to: get the symbol; get the section. */
12857 isym = &rcookie->locsyms[r_symndx];
12858 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12860 && (isec->kept_section != NULL
12861 || discarded_section (isec)))
12869 /* Discard unneeded references to discarded sections.
12870 Returns -1 on error, 1 if any section's size was changed, 0 if
12871 nothing changed. This function assumes that the relocations are in
12872 sorted order, which is true for all known assemblers. */
12875 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12877 struct elf_reloc_cookie cookie;
12882 if (info->traditional_format
12883 || !is_elf_hash_table (info->hash))
12886 o = bfd_get_section_by_name (output_bfd, ".stab");
12891 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12894 || i->reloc_count == 0
12895 || i->sec_info_type != SEC_INFO_TYPE_STABS)
12899 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12902 if (!init_reloc_cookie_for_section (&cookie, info, i))
12905 if (_bfd_discard_section_stabs (abfd, i,
12906 elf_section_data (i)->sec_info,
12907 bfd_elf_reloc_symbol_deleted_p,
12911 fini_reloc_cookie_for_section (&cookie, i);
12915 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
12920 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12926 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12929 if (!init_reloc_cookie_for_section (&cookie, info, i))
12932 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
12933 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
12934 bfd_elf_reloc_symbol_deleted_p,
12938 fini_reloc_cookie_for_section (&cookie, i);
12942 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
12944 const struct elf_backend_data *bed;
12946 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12949 bed = get_elf_backend_data (abfd);
12951 if (bed->elf_backend_discard_info != NULL)
12953 if (!init_reloc_cookie (&cookie, info, abfd))
12956 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
12959 fini_reloc_cookie (&cookie, abfd);
12963 if (info->eh_frame_hdr
12964 && !info->relocatable
12965 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12972 _bfd_elf_section_already_linked (bfd *abfd,
12974 struct bfd_link_info *info)
12977 const char *name, *key;
12978 struct bfd_section_already_linked *l;
12979 struct bfd_section_already_linked_hash_entry *already_linked_list;
12981 if (sec->output_section == bfd_abs_section_ptr)
12984 flags = sec->flags;
12986 /* Return if it isn't a linkonce section. A comdat group section
12987 also has SEC_LINK_ONCE set. */
12988 if ((flags & SEC_LINK_ONCE) == 0)
12991 /* Don't put group member sections on our list of already linked
12992 sections. They are handled as a group via their group section. */
12993 if (elf_sec_group (sec) != NULL)
12996 /* For a SHT_GROUP section, use the group signature as the key. */
12998 if ((flags & SEC_GROUP) != 0
12999 && elf_next_in_group (sec) != NULL
13000 && elf_group_name (elf_next_in_group (sec)) != NULL)
13001 key = elf_group_name (elf_next_in_group (sec));
13004 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
13005 if (CONST_STRNEQ (name, ".gnu.linkonce.")
13006 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
13009 /* Must be a user linkonce section that doesn't follow gcc's
13010 naming convention. In this case we won't be matching
13011 single member groups. */
13015 already_linked_list = bfd_section_already_linked_table_lookup (key);
13017 for (l = already_linked_list->entry; l != NULL; l = l->next)
13019 /* We may have 2 different types of sections on the list: group
13020 sections with a signature of <key> (<key> is some string),
13021 and linkonce sections named .gnu.linkonce.<type>.<key>.
13022 Match like sections. LTO plugin sections are an exception.
13023 They are always named .gnu.linkonce.t.<key> and match either
13024 type of section. */
13025 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
13026 && ((flags & SEC_GROUP) != 0
13027 || strcmp (name, l->sec->name) == 0))
13028 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
13030 /* The section has already been linked. See if we should
13031 issue a warning. */
13032 if (!_bfd_handle_already_linked (sec, l, info))
13035 if (flags & SEC_GROUP)
13037 asection *first = elf_next_in_group (sec);
13038 asection *s = first;
13042 s->output_section = bfd_abs_section_ptr;
13043 /* Record which group discards it. */
13044 s->kept_section = l->sec;
13045 s = elf_next_in_group (s);
13046 /* These lists are circular. */
13056 /* A single member comdat group section may be discarded by a
13057 linkonce section and vice versa. */
13058 if ((flags & SEC_GROUP) != 0)
13060 asection *first = elf_next_in_group (sec);
13062 if (first != NULL && elf_next_in_group (first) == first)
13063 /* Check this single member group against linkonce sections. */
13064 for (l = already_linked_list->entry; l != NULL; l = l->next)
13065 if ((l->sec->flags & SEC_GROUP) == 0
13066 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
13068 first->output_section = bfd_abs_section_ptr;
13069 first->kept_section = l->sec;
13070 sec->output_section = bfd_abs_section_ptr;
13075 /* Check this linkonce section against single member groups. */
13076 for (l = already_linked_list->entry; l != NULL; l = l->next)
13077 if (l->sec->flags & SEC_GROUP)
13079 asection *first = elf_next_in_group (l->sec);
13082 && elf_next_in_group (first) == first
13083 && bfd_elf_match_symbols_in_sections (first, sec, info))
13085 sec->output_section = bfd_abs_section_ptr;
13086 sec->kept_section = first;
13091 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
13092 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
13093 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
13094 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
13095 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
13096 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
13097 `.gnu.linkonce.t.F' section from a different bfd not requiring any
13098 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
13099 The reverse order cannot happen as there is never a bfd with only the
13100 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
13101 matter as here were are looking only for cross-bfd sections. */
13103 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
13104 for (l = already_linked_list->entry; l != NULL; l = l->next)
13105 if ((l->sec->flags & SEC_GROUP) == 0
13106 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
13108 if (abfd != l->sec->owner)
13109 sec->output_section = bfd_abs_section_ptr;
13113 /* This is the first section with this name. Record it. */
13114 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
13115 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
13116 return sec->output_section == bfd_abs_section_ptr;
13120 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
13122 return sym->st_shndx == SHN_COMMON;
13126 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
13132 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
13134 return bfd_com_section_ptr;
13138 _bfd_elf_default_got_elt_size (bfd *abfd,
13139 struct bfd_link_info *info ATTRIBUTE_UNUSED,
13140 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
13141 bfd *ibfd ATTRIBUTE_UNUSED,
13142 unsigned long symndx ATTRIBUTE_UNUSED)
13144 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13145 return bed->s->arch_size / 8;
13148 /* Routines to support the creation of dynamic relocs. */
13150 /* Returns the name of the dynamic reloc section associated with SEC. */
13152 static const char *
13153 get_dynamic_reloc_section_name (bfd * abfd,
13155 bfd_boolean is_rela)
13158 const char *old_name = bfd_get_section_name (NULL, sec);
13159 const char *prefix = is_rela ? ".rela" : ".rel";
13161 if (old_name == NULL)
13164 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
13165 sprintf (name, "%s%s", prefix, old_name);
13170 /* Returns the dynamic reloc section associated with SEC.
13171 If necessary compute the name of the dynamic reloc section based
13172 on SEC's name (looked up in ABFD's string table) and the setting
13176 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
13178 bfd_boolean is_rela)
13180 asection * reloc_sec = elf_section_data (sec)->sreloc;
13182 if (reloc_sec == NULL)
13184 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13188 reloc_sec = bfd_get_linker_section (abfd, name);
13190 if (reloc_sec != NULL)
13191 elf_section_data (sec)->sreloc = reloc_sec;
13198 /* Returns the dynamic reloc section associated with SEC. If the
13199 section does not exist it is created and attached to the DYNOBJ
13200 bfd and stored in the SRELOC field of SEC's elf_section_data
13203 ALIGNMENT is the alignment for the newly created section and
13204 IS_RELA defines whether the name should be .rela.<SEC's name>
13205 or .rel.<SEC's name>. The section name is looked up in the
13206 string table associated with ABFD. */
13209 _bfd_elf_make_dynamic_reloc_section (asection *sec,
13211 unsigned int alignment,
13213 bfd_boolean is_rela)
13215 asection * reloc_sec = elf_section_data (sec)->sreloc;
13217 if (reloc_sec == NULL)
13219 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13224 reloc_sec = bfd_get_linker_section (dynobj, name);
13226 if (reloc_sec == NULL)
13228 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
13229 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
13230 if ((sec->flags & SEC_ALLOC) != 0)
13231 flags |= SEC_ALLOC | SEC_LOAD;
13233 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13234 if (reloc_sec != NULL)
13236 /* _bfd_elf_get_sec_type_attr chooses a section type by
13237 name. Override as it may be wrong, eg. for a user
13238 section named "auto" we'll get ".relauto" which is
13239 seen to be a .rela section. */
13240 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13241 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13246 elf_section_data (sec)->sreloc = reloc_sec;
13252 /* Copy the ELF symbol type and other attributes for a linker script
13253 assignment from HSRC to HDEST. Generally this should be treated as
13254 if we found a strong non-dynamic definition for HDEST (except that
13255 ld ignores multiple definition errors). */
13257 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13258 struct bfd_link_hash_entry *hdest,
13259 struct bfd_link_hash_entry *hsrc)
13261 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13262 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13263 Elf_Internal_Sym isym;
13265 ehdest->type = ehsrc->type;
13266 ehdest->target_internal = ehsrc->target_internal;
13268 isym.st_other = ehsrc->other;
13269 elf_merge_st_other (abfd, ehdest, &isym, NULL, TRUE, FALSE);
13272 /* Append a RELA relocation REL to section S in BFD. */
13275 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13277 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13278 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13279 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13280 bed->s->swap_reloca_out (abfd, rel, loc);
13283 /* Append a REL relocation REL to section S in BFD. */
13286 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13288 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13289 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13290 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13291 bed->s->swap_reloc_out (abfd, rel, loc);