1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2014 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. */
27 #include "safe-ctype.h"
28 #include "libiberty.h"
31 /* This struct is used to pass information to routines called via
32 elf_link_hash_traverse which must return failure. */
34 struct elf_info_failed
36 struct bfd_link_info *info;
40 /* This structure is used to pass information to
41 _bfd_elf_link_find_version_dependencies. */
43 struct elf_find_verdep_info
45 /* General link information. */
46 struct bfd_link_info *info;
47 /* The number of dependencies. */
49 /* Whether we had a failure. */
53 static bfd_boolean _bfd_elf_fix_symbol_flags
54 (struct elf_link_hash_entry *, struct elf_info_failed *);
56 /* Define a symbol in a dynamic linkage section. */
58 struct elf_link_hash_entry *
59 _bfd_elf_define_linkage_sym (bfd *abfd,
60 struct bfd_link_info *info,
64 struct elf_link_hash_entry *h;
65 struct bfd_link_hash_entry *bh;
66 const struct elf_backend_data *bed;
68 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
71 /* Zap symbol defined in an as-needed lib that wasn't linked.
72 This is a symptom of a larger problem: Absolute symbols
73 defined in shared libraries can't be overridden, because we
74 lose the link to the bfd which is via the symbol section. */
75 h->root.type = bfd_link_hash_new;
79 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
81 get_elf_backend_data (abfd)->collect,
84 h = (struct elf_link_hash_entry *) bh;
88 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
89 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
91 bed = get_elf_backend_data (abfd);
92 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
97 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
101 struct elf_link_hash_entry *h;
102 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
103 struct elf_link_hash_table *htab = elf_hash_table (info);
105 /* This function may be called more than once. */
106 s = bfd_get_linker_section (abfd, ".got");
110 flags = bed->dynamic_sec_flags;
112 s = bfd_make_section_anyway_with_flags (abfd,
113 (bed->rela_plts_and_copies_p
114 ? ".rela.got" : ".rel.got"),
115 (bed->dynamic_sec_flags
118 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
122 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
124 || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
128 if (bed->want_got_plt)
130 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
132 || !bfd_set_section_alignment (abfd, s,
133 bed->s->log_file_align))
138 /* The first bit of the global offset table is the header. */
139 s->size += bed->got_header_size;
141 if (bed->want_got_sym)
143 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
144 (or .got.plt) section. We don't do this in the linker script
145 because we don't want to define the symbol if we are not creating
146 a global offset table. */
147 h = _bfd_elf_define_linkage_sym (abfd, info, s,
148 "_GLOBAL_OFFSET_TABLE_");
149 elf_hash_table (info)->hgot = h;
157 /* Create a strtab to hold the dynamic symbol names. */
159 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
161 struct elf_link_hash_table *hash_table;
163 hash_table = elf_hash_table (info);
164 if (hash_table->dynobj == NULL)
165 hash_table->dynobj = abfd;
167 if (hash_table->dynstr == NULL)
169 hash_table->dynstr = _bfd_elf_strtab_init ();
170 if (hash_table->dynstr == NULL)
176 /* Create some sections which will be filled in with dynamic linking
177 information. ABFD is an input file which requires dynamic sections
178 to be created. The dynamic sections take up virtual memory space
179 when the final executable is run, so we need to create them before
180 addresses are assigned to the output sections. We work out the
181 actual contents and size of these sections later. */
184 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
188 const struct elf_backend_data *bed;
189 struct elf_link_hash_entry *h;
191 if (! is_elf_hash_table (info->hash))
194 if (elf_hash_table (info)->dynamic_sections_created)
197 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
200 abfd = elf_hash_table (info)->dynobj;
201 bed = get_elf_backend_data (abfd);
203 flags = bed->dynamic_sec_flags;
205 /* A dynamically linked executable has a .interp section, but a
206 shared library does not. */
207 if (info->executable)
209 s = bfd_make_section_anyway_with_flags (abfd, ".interp",
210 flags | SEC_READONLY);
215 /* Create sections to hold version informations. These are removed
216 if they are not needed. */
217 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d",
218 flags | SEC_READONLY);
220 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
223 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version",
224 flags | SEC_READONLY);
226 || ! bfd_set_section_alignment (abfd, s, 1))
229 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r",
230 flags | SEC_READONLY);
232 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
235 s = bfd_make_section_anyway_with_flags (abfd, ".dynsym",
236 flags | SEC_READONLY);
238 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
241 s = bfd_make_section_anyway_with_flags (abfd, ".dynstr",
242 flags | SEC_READONLY);
246 s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags);
248 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
251 /* The special symbol _DYNAMIC is always set to the start of the
252 .dynamic section. We could set _DYNAMIC in a linker script, but we
253 only want to define it if we are, in fact, creating a .dynamic
254 section. We don't want to define it if there is no .dynamic
255 section, since on some ELF platforms the start up code examines it
256 to decide how to initialize the process. */
257 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC");
258 elf_hash_table (info)->hdynamic = h;
264 s = bfd_make_section_anyway_with_flags (abfd, ".hash",
265 flags | SEC_READONLY);
267 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
269 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
272 if (info->emit_gnu_hash)
274 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
275 flags | SEC_READONLY);
277 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
279 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
280 4 32-bit words followed by variable count of 64-bit words, then
281 variable count of 32-bit words. */
282 if (bed->s->arch_size == 64)
283 elf_section_data (s)->this_hdr.sh_entsize = 0;
285 elf_section_data (s)->this_hdr.sh_entsize = 4;
288 /* Let the backend create the rest of the sections. This lets the
289 backend set the right flags. The backend will normally create
290 the .got and .plt sections. */
291 if (bed->elf_backend_create_dynamic_sections == NULL
292 || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
295 elf_hash_table (info)->dynamic_sections_created = TRUE;
300 /* Create dynamic sections when linking against a dynamic object. */
303 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
305 flagword flags, pltflags;
306 struct elf_link_hash_entry *h;
308 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
309 struct elf_link_hash_table *htab = elf_hash_table (info);
311 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
312 .rel[a].bss sections. */
313 flags = bed->dynamic_sec_flags;
316 if (bed->plt_not_loaded)
317 /* We do not clear SEC_ALLOC here because we still want the OS to
318 allocate space for the section; it's just that there's nothing
319 to read in from the object file. */
320 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
322 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
323 if (bed->plt_readonly)
324 pltflags |= SEC_READONLY;
326 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
328 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
332 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
334 if (bed->want_plt_sym)
336 h = _bfd_elf_define_linkage_sym (abfd, info, s,
337 "_PROCEDURE_LINKAGE_TABLE_");
338 elf_hash_table (info)->hplt = h;
343 s = bfd_make_section_anyway_with_flags (abfd,
344 (bed->rela_plts_and_copies_p
345 ? ".rela.plt" : ".rel.plt"),
346 flags | SEC_READONLY);
348 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
352 if (! _bfd_elf_create_got_section (abfd, info))
355 if (bed->want_dynbss)
357 /* The .dynbss section is a place to put symbols which are defined
358 by dynamic objects, are referenced by regular objects, and are
359 not functions. We must allocate space for them in the process
360 image and use a R_*_COPY reloc to tell the dynamic linker to
361 initialize them at run time. The linker script puts the .dynbss
362 section into the .bss section of the final image. */
363 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
364 (SEC_ALLOC | SEC_LINKER_CREATED));
368 /* The .rel[a].bss section holds copy relocs. This section is not
369 normally needed. We need to create it here, though, so that the
370 linker will map it to an output section. We can't just create it
371 only if we need it, because we will not know whether we need it
372 until we have seen all the input files, and the first time the
373 main linker code calls BFD after examining all the input files
374 (size_dynamic_sections) the input sections have already been
375 mapped to the output sections. If the section turns out not to
376 be needed, we can discard it later. We will never need this
377 section when generating a shared object, since they do not use
381 s = bfd_make_section_anyway_with_flags (abfd,
382 (bed->rela_plts_and_copies_p
383 ? ".rela.bss" : ".rel.bss"),
384 flags | SEC_READONLY);
386 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
394 /* Record a new dynamic symbol. We record the dynamic symbols as we
395 read the input files, since we need to have a list of all of them
396 before we can determine the final sizes of the output sections.
397 Note that we may actually call this function even though we are not
398 going to output any dynamic symbols; in some cases we know that a
399 symbol should be in the dynamic symbol table, but only if there is
403 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
404 struct elf_link_hash_entry *h)
406 if (h->dynindx == -1)
408 struct elf_strtab_hash *dynstr;
413 /* XXX: The ABI draft says the linker must turn hidden and
414 internal symbols into STB_LOCAL symbols when producing the
415 DSO. However, if ld.so honors st_other in the dynamic table,
416 this would not be necessary. */
417 switch (ELF_ST_VISIBILITY (h->other))
421 if (h->root.type != bfd_link_hash_undefined
422 && h->root.type != bfd_link_hash_undefweak)
425 if (!elf_hash_table (info)->is_relocatable_executable)
433 h->dynindx = elf_hash_table (info)->dynsymcount;
434 ++elf_hash_table (info)->dynsymcount;
436 dynstr = elf_hash_table (info)->dynstr;
439 /* Create a strtab to hold the dynamic symbol names. */
440 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
445 /* We don't put any version information in the dynamic string
447 name = h->root.root.string;
448 p = strchr (name, ELF_VER_CHR);
450 /* We know that the p points into writable memory. In fact,
451 there are only a few symbols that have read-only names, being
452 those like _GLOBAL_OFFSET_TABLE_ that are created specially
453 by the backends. Most symbols will have names pointing into
454 an ELF string table read from a file, or to objalloc memory. */
457 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
462 if (indx == (bfd_size_type) -1)
464 h->dynstr_index = indx;
470 /* Mark a symbol dynamic. */
473 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
474 struct elf_link_hash_entry *h,
475 Elf_Internal_Sym *sym)
477 struct bfd_elf_dynamic_list *d = info->dynamic_list;
479 /* It may be called more than once on the same H. */
480 if(h->dynamic || info->relocatable)
483 if ((info->dynamic_data
484 && (h->type == STT_OBJECT
486 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
488 && h->root.type == bfd_link_hash_new
489 && (*d->match) (&d->head, NULL, h->root.root.string)))
493 /* Record an assignment to a symbol made by a linker script. We need
494 this in case some dynamic object refers to this symbol. */
497 bfd_elf_record_link_assignment (bfd *output_bfd,
498 struct bfd_link_info *info,
503 struct elf_link_hash_entry *h, *hv;
504 struct elf_link_hash_table *htab;
505 const struct elf_backend_data *bed;
507 if (!is_elf_hash_table (info->hash))
510 htab = elf_hash_table (info);
511 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
515 switch (h->root.type)
517 case bfd_link_hash_defined:
518 case bfd_link_hash_defweak:
519 case bfd_link_hash_common:
521 case bfd_link_hash_undefweak:
522 case bfd_link_hash_undefined:
523 /* Since we're defining the symbol, don't let it seem to have not
524 been defined. record_dynamic_symbol and size_dynamic_sections
525 may depend on this. */
526 h->root.type = bfd_link_hash_new;
527 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
528 bfd_link_repair_undef_list (&htab->root);
530 case bfd_link_hash_new:
531 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
534 case bfd_link_hash_indirect:
535 /* We had a versioned symbol in a dynamic library. We make the
536 the versioned symbol point to this one. */
537 bed = get_elf_backend_data (output_bfd);
539 while (hv->root.type == bfd_link_hash_indirect
540 || hv->root.type == bfd_link_hash_warning)
541 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
542 /* We don't need to update h->root.u since linker will set them
544 h->root.type = bfd_link_hash_undefined;
545 hv->root.type = bfd_link_hash_indirect;
546 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
547 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
549 case bfd_link_hash_warning:
554 /* If this symbol is being provided by the linker script, and it is
555 currently defined by a dynamic object, but not by a regular
556 object, then mark it as undefined so that the generic linker will
557 force the correct value. */
561 h->root.type = bfd_link_hash_undefined;
563 /* If this symbol is not being provided by the linker script, and it is
564 currently defined by a dynamic object, but not by a regular object,
565 then clear out any version information because the symbol will not be
566 associated with the dynamic object any more. */
570 h->verinfo.verdef = NULL;
576 bed = get_elf_backend_data (output_bfd);
577 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
578 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
579 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
582 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
584 if (!info->relocatable
586 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
587 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
593 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
596 if (! bfd_elf_link_record_dynamic_symbol (info, h))
599 /* If this is a weak defined symbol, and we know a corresponding
600 real symbol from the same dynamic object, make sure the real
601 symbol is also made into a dynamic symbol. */
602 if (h->u.weakdef != NULL
603 && h->u.weakdef->dynindx == -1)
605 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
613 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
614 success, and 2 on a failure caused by attempting to record a symbol
615 in a discarded section, eg. a discarded link-once section symbol. */
618 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
623 struct elf_link_local_dynamic_entry *entry;
624 struct elf_link_hash_table *eht;
625 struct elf_strtab_hash *dynstr;
626 unsigned long dynstr_index;
628 Elf_External_Sym_Shndx eshndx;
629 char esym[sizeof (Elf64_External_Sym)];
631 if (! is_elf_hash_table (info->hash))
634 /* See if the entry exists already. */
635 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
636 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
639 amt = sizeof (*entry);
640 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
644 /* Go find the symbol, so that we can find it's name. */
645 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
646 1, input_indx, &entry->isym, esym, &eshndx))
648 bfd_release (input_bfd, entry);
652 if (entry->isym.st_shndx != SHN_UNDEF
653 && entry->isym.st_shndx < SHN_LORESERVE)
657 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
658 if (s == NULL || bfd_is_abs_section (s->output_section))
660 /* We can still bfd_release here as nothing has done another
661 bfd_alloc. We can't do this later in this function. */
662 bfd_release (input_bfd, entry);
667 name = (bfd_elf_string_from_elf_section
668 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
669 entry->isym.st_name));
671 dynstr = elf_hash_table (info)->dynstr;
674 /* Create a strtab to hold the dynamic symbol names. */
675 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
680 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
681 if (dynstr_index == (unsigned long) -1)
683 entry->isym.st_name = dynstr_index;
685 eht = elf_hash_table (info);
687 entry->next = eht->dynlocal;
688 eht->dynlocal = entry;
689 entry->input_bfd = input_bfd;
690 entry->input_indx = input_indx;
693 /* Whatever binding the symbol had before, it's now local. */
695 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
697 /* The dynindx will be set at the end of size_dynamic_sections. */
702 /* Return the dynindex of a local dynamic symbol. */
705 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
709 struct elf_link_local_dynamic_entry *e;
711 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
712 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
717 /* This function is used to renumber the dynamic symbols, if some of
718 them are removed because they are marked as local. This is called
719 via elf_link_hash_traverse. */
722 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
725 size_t *count = (size_t *) data;
730 if (h->dynindx != -1)
731 h->dynindx = ++(*count);
737 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
738 STB_LOCAL binding. */
741 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
744 size_t *count = (size_t *) data;
746 if (!h->forced_local)
749 if (h->dynindx != -1)
750 h->dynindx = ++(*count);
755 /* Return true if the dynamic symbol for a given section should be
756 omitted when creating a shared library. */
758 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
759 struct bfd_link_info *info,
762 struct elf_link_hash_table *htab;
764 switch (elf_section_data (p)->this_hdr.sh_type)
768 /* If sh_type is yet undecided, assume it could be
769 SHT_PROGBITS/SHT_NOBITS. */
771 htab = elf_hash_table (info);
772 if (p == htab->tls_sec)
775 if (htab->text_index_section != NULL)
776 return p != htab->text_index_section && p != htab->data_index_section;
778 if (strcmp (p->name, ".got") == 0
779 || strcmp (p->name, ".got.plt") == 0
780 || strcmp (p->name, ".plt") == 0)
784 if (htab->dynobj != NULL
785 && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
786 && ip->output_section == p)
791 /* There shouldn't be section relative relocations
792 against any other section. */
798 /* Assign dynsym indices. In a shared library we generate a section
799 symbol for each output section, which come first. Next come symbols
800 which have been forced to local binding. Then all of the back-end
801 allocated local dynamic syms, followed by the rest of the global
805 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
806 struct bfd_link_info *info,
807 unsigned long *section_sym_count)
809 unsigned long dynsymcount = 0;
811 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
813 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
815 for (p = output_bfd->sections; p ; p = p->next)
816 if ((p->flags & SEC_EXCLUDE) == 0
817 && (p->flags & SEC_ALLOC) != 0
818 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
819 elf_section_data (p)->dynindx = ++dynsymcount;
821 elf_section_data (p)->dynindx = 0;
823 *section_sym_count = dynsymcount;
825 elf_link_hash_traverse (elf_hash_table (info),
826 elf_link_renumber_local_hash_table_dynsyms,
829 if (elf_hash_table (info)->dynlocal)
831 struct elf_link_local_dynamic_entry *p;
832 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
833 p->dynindx = ++dynsymcount;
836 elf_link_hash_traverse (elf_hash_table (info),
837 elf_link_renumber_hash_table_dynsyms,
840 /* There is an unused NULL entry at the head of the table which
841 we must account for in our count. Unless there weren't any
842 symbols, which means we'll have no table at all. */
843 if (dynsymcount != 0)
846 elf_hash_table (info)->dynsymcount = dynsymcount;
850 /* Merge st_other field. */
853 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
854 const Elf_Internal_Sym *isym,
855 bfd_boolean definition, bfd_boolean dynamic)
857 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
859 /* If st_other has a processor-specific meaning, specific
860 code might be needed here. */
861 if (bed->elf_backend_merge_symbol_attribute)
862 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
867 unsigned symvis = ELF_ST_VISIBILITY (isym->st_other);
868 unsigned hvis = ELF_ST_VISIBILITY (h->other);
870 /* Keep the most constraining visibility. Leave the remainder
871 of the st_other field to elf_backend_merge_symbol_attribute. */
872 if (symvis - 1 < hvis - 1)
873 h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
877 /* This function is called when we want to merge a new symbol with an
878 existing symbol. It handles the various cases which arise when we
879 find a definition in a dynamic object, or when there is already a
880 definition in a dynamic object. The new symbol is described by
881 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
882 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
883 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
884 of an old common symbol. We set OVERRIDE if the old symbol is
885 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
886 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
887 to change. By OK to change, we mean that we shouldn't warn if the
888 type or size does change. */
891 _bfd_elf_merge_symbol (bfd *abfd,
892 struct bfd_link_info *info,
894 Elf_Internal_Sym *sym,
897 struct elf_link_hash_entry **sym_hash,
899 bfd_boolean *pold_weak,
900 unsigned int *pold_alignment,
902 bfd_boolean *override,
903 bfd_boolean *type_change_ok,
904 bfd_boolean *size_change_ok)
906 asection *sec, *oldsec;
907 struct elf_link_hash_entry *h;
908 struct elf_link_hash_entry *hi;
909 struct elf_link_hash_entry *flip;
912 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
913 bfd_boolean newweak, oldweak, newfunc, oldfunc;
914 const struct elf_backend_data *bed;
920 bind = ELF_ST_BIND (sym->st_info);
922 if (! bfd_is_und_section (sec))
923 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
925 h = ((struct elf_link_hash_entry *)
926 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
931 bed = get_elf_backend_data (abfd);
933 /* For merging, we only care about real symbols. But we need to make
934 sure that indirect symbol dynamic flags are updated. */
936 while (h->root.type == bfd_link_hash_indirect
937 || h->root.type == bfd_link_hash_warning)
938 h = (struct elf_link_hash_entry *) h->root.u.i.link;
940 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
945 switch (h->root.type)
950 case bfd_link_hash_undefined:
951 case bfd_link_hash_undefweak:
952 oldbfd = h->root.u.undef.abfd;
955 case bfd_link_hash_defined:
956 case bfd_link_hash_defweak:
957 oldbfd = h->root.u.def.section->owner;
958 oldsec = h->root.u.def.section;
961 case bfd_link_hash_common:
962 oldbfd = h->root.u.c.p->section->owner;
963 oldsec = h->root.u.c.p->section;
965 *pold_alignment = h->root.u.c.p->alignment_power;
968 if (poldbfd && *poldbfd == NULL)
971 /* Differentiate strong and weak symbols. */
972 newweak = bind == STB_WEAK;
973 oldweak = (h->root.type == bfd_link_hash_defweak
974 || h->root.type == bfd_link_hash_undefweak);
976 *pold_weak = oldweak;
978 /* This code is for coping with dynamic objects, and is only useful
979 if we are doing an ELF link. */
980 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
983 /* We have to check it for every instance since the first few may be
984 references and not all compilers emit symbol type for undefined
986 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
988 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
989 respectively, is from a dynamic object. */
991 newdyn = (abfd->flags & DYNAMIC) != 0;
993 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
994 syms and defined syms in dynamic libraries respectively.
995 ref_dynamic on the other hand can be set for a symbol defined in
996 a dynamic library, and def_dynamic may not be set; When the
997 definition in a dynamic lib is overridden by a definition in the
998 executable use of the symbol in the dynamic lib becomes a
999 reference to the executable symbol. */
1002 if (bfd_is_und_section (sec))
1004 if (bind != STB_WEAK)
1006 h->ref_dynamic_nonweak = 1;
1007 hi->ref_dynamic_nonweak = 1;
1013 hi->dynamic_def = 1;
1017 /* If we just created the symbol, mark it as being an ELF symbol.
1018 Other than that, there is nothing to do--there is no merge issue
1019 with a newly defined symbol--so we just return. */
1021 if (h->root.type == bfd_link_hash_new)
1027 /* In cases involving weak versioned symbols, we may wind up trying
1028 to merge a symbol with itself. Catch that here, to avoid the
1029 confusion that results if we try to override a symbol with
1030 itself. The additional tests catch cases like
1031 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1032 dynamic object, which we do want to handle here. */
1034 && (newweak || oldweak)
1035 && ((abfd->flags & DYNAMIC) == 0
1036 || !h->def_regular))
1041 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1042 else if (oldsec != NULL)
1044 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1045 indices used by MIPS ELF. */
1046 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1049 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1050 respectively, appear to be a definition rather than reference. */
1052 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1054 olddef = (h->root.type != bfd_link_hash_undefined
1055 && h->root.type != bfd_link_hash_undefweak
1056 && h->root.type != bfd_link_hash_common);
1058 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1059 respectively, appear to be a function. */
1061 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1062 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1064 oldfunc = (h->type != STT_NOTYPE
1065 && bed->is_function_type (h->type));
1067 /* When we try to create a default indirect symbol from the dynamic
1068 definition with the default version, we skip it if its type and
1069 the type of existing regular definition mismatch. */
1070 if (pold_alignment == NULL
1074 && (((olddef || h->root.type == bfd_link_hash_common)
1075 && ELF_ST_TYPE (sym->st_info) != h->type
1076 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1077 && h->type != STT_NOTYPE
1078 && !(newfunc && oldfunc))
1080 && ((h->type == STT_GNU_IFUNC)
1081 != (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)))))
1087 /* Check TLS symbols. We don't check undefined symbols introduced
1088 by "ld -u" which have no type (and oldbfd NULL), and we don't
1089 check symbols from plugins because they also have no type. */
1091 && (oldbfd->flags & BFD_PLUGIN) == 0
1092 && (abfd->flags & BFD_PLUGIN) == 0
1093 && ELF_ST_TYPE (sym->st_info) != h->type
1094 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1097 bfd_boolean ntdef, tdef;
1098 asection *ntsec, *tsec;
1100 if (h->type == STT_TLS)
1120 (*_bfd_error_handler)
1121 (_("%s: TLS definition in %B section %A "
1122 "mismatches non-TLS definition in %B section %A"),
1123 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1124 else if (!tdef && !ntdef)
1125 (*_bfd_error_handler)
1126 (_("%s: TLS reference in %B "
1127 "mismatches non-TLS reference in %B"),
1128 tbfd, ntbfd, h->root.root.string);
1130 (*_bfd_error_handler)
1131 (_("%s: TLS definition in %B section %A "
1132 "mismatches non-TLS reference in %B"),
1133 tbfd, tsec, ntbfd, h->root.root.string);
1135 (*_bfd_error_handler)
1136 (_("%s: TLS reference in %B "
1137 "mismatches non-TLS definition in %B section %A"),
1138 tbfd, ntbfd, ntsec, h->root.root.string);
1140 bfd_set_error (bfd_error_bad_value);
1144 /* If the old symbol has non-default visibility, we ignore the new
1145 definition from a dynamic object. */
1147 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1148 && !bfd_is_und_section (sec))
1151 /* Make sure this symbol is dynamic. */
1153 hi->ref_dynamic = 1;
1154 /* A protected symbol has external availability. Make sure it is
1155 recorded as dynamic.
1157 FIXME: Should we check type and size for protected symbol? */
1158 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1159 return bfd_elf_link_record_dynamic_symbol (info, h);
1164 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1167 /* If the new symbol with non-default visibility comes from a
1168 relocatable file and the old definition comes from a dynamic
1169 object, we remove the old definition. */
1170 if (hi->root.type == bfd_link_hash_indirect)
1172 /* Handle the case where the old dynamic definition is
1173 default versioned. We need to copy the symbol info from
1174 the symbol with default version to the normal one if it
1175 was referenced before. */
1178 hi->root.type = h->root.type;
1179 h->root.type = bfd_link_hash_indirect;
1180 (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
1182 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1183 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1185 /* If the new symbol is hidden or internal, completely undo
1186 any dynamic link state. */
1187 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1188 h->forced_local = 0;
1195 /* FIXME: Should we check type and size for protected symbol? */
1205 /* If the old symbol was undefined before, then it will still be
1206 on the undefs list. If the new symbol is undefined or
1207 common, we can't make it bfd_link_hash_new here, because new
1208 undefined or common symbols will be added to the undefs list
1209 by _bfd_generic_link_add_one_symbol. Symbols may not be
1210 added twice to the undefs list. Also, if the new symbol is
1211 undefweak then we don't want to lose the strong undef. */
1212 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1214 h->root.type = bfd_link_hash_undefined;
1215 h->root.u.undef.abfd = abfd;
1219 h->root.type = bfd_link_hash_new;
1220 h->root.u.undef.abfd = NULL;
1223 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1225 /* If the new symbol is hidden or internal, completely undo
1226 any dynamic link state. */
1227 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1228 h->forced_local = 0;
1234 /* FIXME: Should we check type and size for protected symbol? */
1240 /* If a new weak symbol definition comes from a regular file and the
1241 old symbol comes from a dynamic library, we treat the new one as
1242 strong. Similarly, an old weak symbol definition from a regular
1243 file is treated as strong when the new symbol comes from a dynamic
1244 library. Further, an old weak symbol from a dynamic library is
1245 treated as strong if the new symbol is from a dynamic library.
1246 This reflects the way glibc's ld.so works.
1248 Do this before setting *type_change_ok or *size_change_ok so that
1249 we warn properly when dynamic library symbols are overridden. */
1251 if (newdef && !newdyn && olddyn)
1253 if (olddef && newdyn)
1256 /* Allow changes between different types of function symbol. */
1257 if (newfunc && oldfunc)
1258 *type_change_ok = TRUE;
1260 /* It's OK to change the type if either the existing symbol or the
1261 new symbol is weak. A type change is also OK if the old symbol
1262 is undefined and the new symbol is defined. */
1267 && h->root.type == bfd_link_hash_undefined))
1268 *type_change_ok = TRUE;
1270 /* It's OK to change the size if either the existing symbol or the
1271 new symbol is weak, or if the old symbol is undefined. */
1274 || h->root.type == bfd_link_hash_undefined)
1275 *size_change_ok = TRUE;
1277 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1278 symbol, respectively, appears to be a common symbol in a dynamic
1279 object. If a symbol appears in an uninitialized section, and is
1280 not weak, and is not a function, then it may be a common symbol
1281 which was resolved when the dynamic object was created. We want
1282 to treat such symbols specially, because they raise special
1283 considerations when setting the symbol size: if the symbol
1284 appears as a common symbol in a regular object, and the size in
1285 the regular object is larger, we must make sure that we use the
1286 larger size. This problematic case can always be avoided in C,
1287 but it must be handled correctly when using Fortran shared
1290 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1291 likewise for OLDDYNCOMMON and OLDDEF.
1293 Note that this test is just a heuristic, and that it is quite
1294 possible to have an uninitialized symbol in a shared object which
1295 is really a definition, rather than a common symbol. This could
1296 lead to some minor confusion when the symbol really is a common
1297 symbol in some regular object. However, I think it will be
1303 && (sec->flags & SEC_ALLOC) != 0
1304 && (sec->flags & SEC_LOAD) == 0
1307 newdyncommon = TRUE;
1309 newdyncommon = FALSE;
1313 && h->root.type == bfd_link_hash_defined
1315 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1316 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1319 olddyncommon = TRUE;
1321 olddyncommon = FALSE;
1323 /* We now know everything about the old and new symbols. We ask the
1324 backend to check if we can merge them. */
1325 if (bed->merge_symbol != NULL)
1327 if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
1332 /* If both the old and the new symbols look like common symbols in a
1333 dynamic object, set the size of the symbol to the larger of the
1338 && sym->st_size != h->size)
1340 /* Since we think we have two common symbols, issue a multiple
1341 common warning if desired. Note that we only warn if the
1342 size is different. If the size is the same, we simply let
1343 the old symbol override the new one as normally happens with
1344 symbols defined in dynamic objects. */
1346 if (! ((*info->callbacks->multiple_common)
1347 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1350 if (sym->st_size > h->size)
1351 h->size = sym->st_size;
1353 *size_change_ok = TRUE;
1356 /* If we are looking at a dynamic object, and we have found a
1357 definition, we need to see if the symbol was already defined by
1358 some other object. If so, we want to use the existing
1359 definition, and we do not want to report a multiple symbol
1360 definition error; we do this by clobbering *PSEC to be
1361 bfd_und_section_ptr.
1363 We treat a common symbol as a definition if the symbol in the
1364 shared library is a function, since common symbols always
1365 represent variables; this can cause confusion in principle, but
1366 any such confusion would seem to indicate an erroneous program or
1367 shared library. We also permit a common symbol in a regular
1368 object to override a weak symbol in a shared object. */
1373 || (h->root.type == bfd_link_hash_common
1374 && (newweak || newfunc))))
1378 newdyncommon = FALSE;
1380 *psec = sec = bfd_und_section_ptr;
1381 *size_change_ok = TRUE;
1383 /* If we get here when the old symbol is a common symbol, then
1384 we are explicitly letting it override a weak symbol or
1385 function in a dynamic object, and we don't want to warn about
1386 a type change. If the old symbol is a defined symbol, a type
1387 change warning may still be appropriate. */
1389 if (h->root.type == bfd_link_hash_common)
1390 *type_change_ok = TRUE;
1393 /* Handle the special case of an old common symbol merging with a
1394 new symbol which looks like a common symbol in a shared object.
1395 We change *PSEC and *PVALUE to make the new symbol look like a
1396 common symbol, and let _bfd_generic_link_add_one_symbol do the
1400 && h->root.type == bfd_link_hash_common)
1404 newdyncommon = FALSE;
1405 *pvalue = sym->st_size;
1406 *psec = sec = bed->common_section (oldsec);
1407 *size_change_ok = TRUE;
1410 /* Skip weak definitions of symbols that are already defined. */
1411 if (newdef && olddef && newweak)
1413 /* Don't skip new non-IR weak syms. */
1414 if (!(oldbfd != NULL
1415 && (oldbfd->flags & BFD_PLUGIN) != 0
1416 && (abfd->flags & BFD_PLUGIN) == 0))
1422 /* Merge st_other. If the symbol already has a dynamic index,
1423 but visibility says it should not be visible, turn it into a
1425 elf_merge_st_other (abfd, h, sym, newdef, newdyn);
1426 if (h->dynindx != -1)
1427 switch (ELF_ST_VISIBILITY (h->other))
1431 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1436 /* If the old symbol is from a dynamic object, and the new symbol is
1437 a definition which is not from a dynamic object, then the new
1438 symbol overrides the old symbol. Symbols from regular files
1439 always take precedence over symbols from dynamic objects, even if
1440 they are defined after the dynamic object in the link.
1442 As above, we again permit a common symbol in a regular object to
1443 override a definition in a shared object if the shared object
1444 symbol is a function or is weak. */
1449 || (bfd_is_com_section (sec)
1450 && (oldweak || oldfunc)))
1455 /* Change the hash table entry to undefined, and let
1456 _bfd_generic_link_add_one_symbol do the right thing with the
1459 h->root.type = bfd_link_hash_undefined;
1460 h->root.u.undef.abfd = h->root.u.def.section->owner;
1461 *size_change_ok = TRUE;
1464 olddyncommon = FALSE;
1466 /* We again permit a type change when a common symbol may be
1467 overriding a function. */
1469 if (bfd_is_com_section (sec))
1473 /* If a common symbol overrides a function, make sure
1474 that it isn't defined dynamically nor has type
1477 h->type = STT_NOTYPE;
1479 *type_change_ok = TRUE;
1482 if (hi->root.type == bfd_link_hash_indirect)
1485 /* This union may have been set to be non-NULL when this symbol
1486 was seen in a dynamic object. We must force the union to be
1487 NULL, so that it is correct for a regular symbol. */
1488 h->verinfo.vertree = NULL;
1491 /* Handle the special case of a new common symbol merging with an
1492 old symbol that looks like it might be a common symbol defined in
1493 a shared object. Note that we have already handled the case in
1494 which a new common symbol should simply override the definition
1495 in the shared library. */
1498 && bfd_is_com_section (sec)
1501 /* It would be best if we could set the hash table entry to a
1502 common symbol, but we don't know what to use for the section
1503 or the alignment. */
1504 if (! ((*info->callbacks->multiple_common)
1505 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1508 /* If the presumed common symbol in the dynamic object is
1509 larger, pretend that the new symbol has its size. */
1511 if (h->size > *pvalue)
1514 /* We need to remember the alignment required by the symbol
1515 in the dynamic object. */
1516 BFD_ASSERT (pold_alignment);
1517 *pold_alignment = h->root.u.def.section->alignment_power;
1520 olddyncommon = FALSE;
1522 h->root.type = bfd_link_hash_undefined;
1523 h->root.u.undef.abfd = h->root.u.def.section->owner;
1525 *size_change_ok = TRUE;
1526 *type_change_ok = TRUE;
1528 if (hi->root.type == bfd_link_hash_indirect)
1531 h->verinfo.vertree = NULL;
1536 /* Handle the case where we had a versioned symbol in a dynamic
1537 library and now find a definition in a normal object. In this
1538 case, we make the versioned symbol point to the normal one. */
1539 flip->root.type = h->root.type;
1540 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1541 h->root.type = bfd_link_hash_indirect;
1542 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1543 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1547 flip->ref_dynamic = 1;
1554 /* This function is called to create an indirect symbol from the
1555 default for the symbol with the default version if needed. The
1556 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1557 set DYNSYM if the new indirect symbol is dynamic. */
1560 _bfd_elf_add_default_symbol (bfd *abfd,
1561 struct bfd_link_info *info,
1562 struct elf_link_hash_entry *h,
1564 Elf_Internal_Sym *sym,
1568 bfd_boolean *dynsym)
1570 bfd_boolean type_change_ok;
1571 bfd_boolean size_change_ok;
1574 struct elf_link_hash_entry *hi;
1575 struct bfd_link_hash_entry *bh;
1576 const struct elf_backend_data *bed;
1577 bfd_boolean collect;
1578 bfd_boolean dynamic;
1579 bfd_boolean override;
1581 size_t len, shortlen;
1584 /* If this symbol has a version, and it is the default version, we
1585 create an indirect symbol from the default name to the fully
1586 decorated name. This will cause external references which do not
1587 specify a version to be bound to this version of the symbol. */
1588 p = strchr (name, ELF_VER_CHR);
1589 if (p == NULL || p[1] != ELF_VER_CHR)
1592 bed = get_elf_backend_data (abfd);
1593 collect = bed->collect;
1594 dynamic = (abfd->flags & DYNAMIC) != 0;
1596 shortlen = p - name;
1597 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1598 if (shortname == NULL)
1600 memcpy (shortname, name, shortlen);
1601 shortname[shortlen] = '\0';
1603 /* We are going to create a new symbol. Merge it with any existing
1604 symbol with this name. For the purposes of the merge, act as
1605 though we were defining the symbol we just defined, although we
1606 actually going to define an indirect symbol. */
1607 type_change_ok = FALSE;
1608 size_change_ok = FALSE;
1610 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1611 &hi, poldbfd, NULL, NULL, &skip, &override,
1612 &type_change_ok, &size_change_ok))
1621 if (! (_bfd_generic_link_add_one_symbol
1622 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1623 0, name, FALSE, collect, &bh)))
1625 hi = (struct elf_link_hash_entry *) bh;
1629 /* In this case the symbol named SHORTNAME is overriding the
1630 indirect symbol we want to add. We were planning on making
1631 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1632 is the name without a version. NAME is the fully versioned
1633 name, and it is the default version.
1635 Overriding means that we already saw a definition for the
1636 symbol SHORTNAME in a regular object, and it is overriding
1637 the symbol defined in the dynamic object.
1639 When this happens, we actually want to change NAME, the
1640 symbol we just added, to refer to SHORTNAME. This will cause
1641 references to NAME in the shared object to become references
1642 to SHORTNAME in the regular object. This is what we expect
1643 when we override a function in a shared object: that the
1644 references in the shared object will be mapped to the
1645 definition in the regular object. */
1647 while (hi->root.type == bfd_link_hash_indirect
1648 || hi->root.type == bfd_link_hash_warning)
1649 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1651 h->root.type = bfd_link_hash_indirect;
1652 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1656 hi->ref_dynamic = 1;
1660 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1665 /* Now set HI to H, so that the following code will set the
1666 other fields correctly. */
1670 /* Check if HI is a warning symbol. */
1671 if (hi->root.type == bfd_link_hash_warning)
1672 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1674 /* If there is a duplicate definition somewhere, then HI may not
1675 point to an indirect symbol. We will have reported an error to
1676 the user in that case. */
1678 if (hi->root.type == bfd_link_hash_indirect)
1680 struct elf_link_hash_entry *ht;
1682 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1683 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1685 /* A reference to the SHORTNAME symbol from a dynamic library
1686 will be satisfied by the versioned symbol at runtime. In
1687 effect, we have a reference to the versioned symbol. */
1688 ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1689 hi->dynamic_def |= ht->dynamic_def;
1691 /* See if the new flags lead us to realize that the symbol must
1697 if (! info->executable
1704 if (hi->ref_regular)
1710 /* We also need to define an indirection from the nondefault version
1714 len = strlen (name);
1715 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1716 if (shortname == NULL)
1718 memcpy (shortname, name, shortlen);
1719 memcpy (shortname + shortlen, p + 1, len - shortlen);
1721 /* Once again, merge with any existing symbol. */
1722 type_change_ok = FALSE;
1723 size_change_ok = FALSE;
1725 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1726 &hi, poldbfd, NULL, NULL, &skip, &override,
1727 &type_change_ok, &size_change_ok))
1735 /* Here SHORTNAME is a versioned name, so we don't expect to see
1736 the type of override we do in the case above unless it is
1737 overridden by a versioned definition. */
1738 if (hi->root.type != bfd_link_hash_defined
1739 && hi->root.type != bfd_link_hash_defweak)
1740 (*_bfd_error_handler)
1741 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1747 if (! (_bfd_generic_link_add_one_symbol
1748 (info, abfd, shortname, BSF_INDIRECT,
1749 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1751 hi = (struct elf_link_hash_entry *) bh;
1753 /* If there is a duplicate definition somewhere, then HI may not
1754 point to an indirect symbol. We will have reported an error
1755 to the user in that case. */
1757 if (hi->root.type == bfd_link_hash_indirect)
1759 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1760 h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1761 hi->dynamic_def |= h->dynamic_def;
1763 /* See if the new flags lead us to realize that the symbol
1769 if (! info->executable
1775 if (hi->ref_regular)
1785 /* This routine is used to export all defined symbols into the dynamic
1786 symbol table. It is called via elf_link_hash_traverse. */
1789 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1791 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1793 /* Ignore indirect symbols. These are added by the versioning code. */
1794 if (h->root.type == bfd_link_hash_indirect)
1797 /* Ignore this if we won't export it. */
1798 if (!eif->info->export_dynamic && !h->dynamic)
1801 if (h->dynindx == -1
1802 && (h->def_regular || h->ref_regular)
1803 && ! bfd_hide_sym_by_version (eif->info->version_info,
1804 h->root.root.string))
1806 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1816 /* Look through the symbols which are defined in other shared
1817 libraries and referenced here. Update the list of version
1818 dependencies. This will be put into the .gnu.version_r section.
1819 This function is called via elf_link_hash_traverse. */
1822 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1825 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1826 Elf_Internal_Verneed *t;
1827 Elf_Internal_Vernaux *a;
1830 /* We only care about symbols defined in shared objects with version
1835 || h->verinfo.verdef == NULL)
1838 /* See if we already know about this version. */
1839 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1843 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1846 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1847 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1853 /* This is a new version. Add it to tree we are building. */
1858 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1861 rinfo->failed = TRUE;
1865 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1866 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1867 elf_tdata (rinfo->info->output_bfd)->verref = t;
1871 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1874 rinfo->failed = TRUE;
1878 /* Note that we are copying a string pointer here, and testing it
1879 above. If bfd_elf_string_from_elf_section is ever changed to
1880 discard the string data when low in memory, this will have to be
1882 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1884 a->vna_flags = h->verinfo.verdef->vd_flags;
1885 a->vna_nextptr = t->vn_auxptr;
1887 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1890 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1897 /* Figure out appropriate versions for all the symbols. We may not
1898 have the version number script until we have read all of the input
1899 files, so until that point we don't know which symbols should be
1900 local. This function is called via elf_link_hash_traverse. */
1903 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1905 struct elf_info_failed *sinfo;
1906 struct bfd_link_info *info;
1907 const struct elf_backend_data *bed;
1908 struct elf_info_failed eif;
1912 sinfo = (struct elf_info_failed *) data;
1915 /* Fix the symbol flags. */
1918 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1921 sinfo->failed = TRUE;
1925 /* We only need version numbers for symbols defined in regular
1927 if (!h->def_regular)
1930 bed = get_elf_backend_data (info->output_bfd);
1931 p = strchr (h->root.root.string, ELF_VER_CHR);
1932 if (p != NULL && h->verinfo.vertree == NULL)
1934 struct bfd_elf_version_tree *t;
1939 /* There are two consecutive ELF_VER_CHR characters if this is
1940 not a hidden symbol. */
1942 if (*p == ELF_VER_CHR)
1948 /* If there is no version string, we can just return out. */
1956 /* Look for the version. If we find it, it is no longer weak. */
1957 for (t = sinfo->info->version_info; t != NULL; t = t->next)
1959 if (strcmp (t->name, p) == 0)
1963 struct bfd_elf_version_expr *d;
1965 len = p - h->root.root.string;
1966 alc = (char *) bfd_malloc (len);
1969 sinfo->failed = TRUE;
1972 memcpy (alc, h->root.root.string, len - 1);
1973 alc[len - 1] = '\0';
1974 if (alc[len - 2] == ELF_VER_CHR)
1975 alc[len - 2] = '\0';
1977 h->verinfo.vertree = t;
1981 if (t->globals.list != NULL)
1982 d = (*t->match) (&t->globals, NULL, alc);
1984 /* See if there is anything to force this symbol to
1986 if (d == NULL && t->locals.list != NULL)
1988 d = (*t->match) (&t->locals, NULL, alc);
1991 && ! info->export_dynamic)
1992 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2000 /* If we are building an application, we need to create a
2001 version node for this version. */
2002 if (t == NULL && info->executable)
2004 struct bfd_elf_version_tree **pp;
2007 /* If we aren't going to export this symbol, we don't need
2008 to worry about it. */
2009 if (h->dynindx == -1)
2013 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2016 sinfo->failed = TRUE;
2021 t->name_indx = (unsigned int) -1;
2025 /* Don't count anonymous version tag. */
2026 if (sinfo->info->version_info != NULL
2027 && sinfo->info->version_info->vernum == 0)
2029 for (pp = &sinfo->info->version_info;
2033 t->vernum = version_index;
2037 h->verinfo.vertree = t;
2041 /* We could not find the version for a symbol when
2042 generating a shared archive. Return an error. */
2043 (*_bfd_error_handler)
2044 (_("%B: version node not found for symbol %s"),
2045 info->output_bfd, h->root.root.string);
2046 bfd_set_error (bfd_error_bad_value);
2047 sinfo->failed = TRUE;
2055 /* If we don't have a version for this symbol, see if we can find
2057 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2062 = bfd_find_version_for_sym (sinfo->info->version_info,
2063 h->root.root.string, &hide);
2064 if (h->verinfo.vertree != NULL && hide)
2065 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2071 /* Read and swap the relocs from the section indicated by SHDR. This
2072 may be either a REL or a RELA section. The relocations are
2073 translated into RELA relocations and stored in INTERNAL_RELOCS,
2074 which should have already been allocated to contain enough space.
2075 The EXTERNAL_RELOCS are a buffer where the external form of the
2076 relocations should be stored.
2078 Returns FALSE if something goes wrong. */
2081 elf_link_read_relocs_from_section (bfd *abfd,
2083 Elf_Internal_Shdr *shdr,
2084 void *external_relocs,
2085 Elf_Internal_Rela *internal_relocs)
2087 const struct elf_backend_data *bed;
2088 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2089 const bfd_byte *erela;
2090 const bfd_byte *erelaend;
2091 Elf_Internal_Rela *irela;
2092 Elf_Internal_Shdr *symtab_hdr;
2095 /* Position ourselves at the start of the section. */
2096 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2099 /* Read the relocations. */
2100 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2103 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2104 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2106 bed = get_elf_backend_data (abfd);
2108 /* Convert the external relocations to the internal format. */
2109 if (shdr->sh_entsize == bed->s->sizeof_rel)
2110 swap_in = bed->s->swap_reloc_in;
2111 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2112 swap_in = bed->s->swap_reloca_in;
2115 bfd_set_error (bfd_error_wrong_format);
2119 erela = (const bfd_byte *) external_relocs;
2120 erelaend = erela + shdr->sh_size;
2121 irela = internal_relocs;
2122 while (erela < erelaend)
2126 (*swap_in) (abfd, erela, irela);
2127 r_symndx = ELF32_R_SYM (irela->r_info);
2128 if (bed->s->arch_size == 64)
2132 if ((size_t) r_symndx >= nsyms)
2134 (*_bfd_error_handler)
2135 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2136 " for offset 0x%lx in section `%A'"),
2138 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2139 bfd_set_error (bfd_error_bad_value);
2143 else if (r_symndx != STN_UNDEF)
2145 (*_bfd_error_handler)
2146 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2147 " when the object file has no symbol table"),
2149 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2150 bfd_set_error (bfd_error_bad_value);
2153 irela += bed->s->int_rels_per_ext_rel;
2154 erela += shdr->sh_entsize;
2160 /* Read and swap the relocs for a section O. They may have been
2161 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2162 not NULL, they are used as buffers to read into. They are known to
2163 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2164 the return value is allocated using either malloc or bfd_alloc,
2165 according to the KEEP_MEMORY argument. If O has two relocation
2166 sections (both REL and RELA relocations), then the REL_HDR
2167 relocations will appear first in INTERNAL_RELOCS, followed by the
2168 RELA_HDR relocations. */
2171 _bfd_elf_link_read_relocs (bfd *abfd,
2173 void *external_relocs,
2174 Elf_Internal_Rela *internal_relocs,
2175 bfd_boolean keep_memory)
2177 void *alloc1 = NULL;
2178 Elf_Internal_Rela *alloc2 = NULL;
2179 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2180 struct bfd_elf_section_data *esdo = elf_section_data (o);
2181 Elf_Internal_Rela *internal_rela_relocs;
2183 if (esdo->relocs != NULL)
2184 return esdo->relocs;
2186 if (o->reloc_count == 0)
2189 if (internal_relocs == NULL)
2193 size = o->reloc_count;
2194 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2196 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2198 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2199 if (internal_relocs == NULL)
2203 if (external_relocs == NULL)
2205 bfd_size_type size = 0;
2208 size += esdo->rel.hdr->sh_size;
2210 size += esdo->rela.hdr->sh_size;
2212 alloc1 = bfd_malloc (size);
2215 external_relocs = alloc1;
2218 internal_rela_relocs = internal_relocs;
2221 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2225 external_relocs = (((bfd_byte *) external_relocs)
2226 + esdo->rel.hdr->sh_size);
2227 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2228 * bed->s->int_rels_per_ext_rel);
2232 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2234 internal_rela_relocs)))
2237 /* Cache the results for next time, if we can. */
2239 esdo->relocs = internal_relocs;
2244 /* Don't free alloc2, since if it was allocated we are passing it
2245 back (under the name of internal_relocs). */
2247 return internal_relocs;
2255 bfd_release (abfd, alloc2);
2262 /* Compute the size of, and allocate space for, REL_HDR which is the
2263 section header for a section containing relocations for O. */
2266 _bfd_elf_link_size_reloc_section (bfd *abfd,
2267 struct bfd_elf_section_reloc_data *reldata)
2269 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2271 /* That allows us to calculate the size of the section. */
2272 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2274 /* The contents field must last into write_object_contents, so we
2275 allocate it with bfd_alloc rather than malloc. Also since we
2276 cannot be sure that the contents will actually be filled in,
2277 we zero the allocated space. */
2278 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2279 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2282 if (reldata->hashes == NULL && reldata->count)
2284 struct elf_link_hash_entry **p;
2286 p = (struct elf_link_hash_entry **)
2287 bfd_zmalloc (reldata->count * sizeof (struct elf_link_hash_entry *));
2291 reldata->hashes = p;
2297 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2298 originated from the section given by INPUT_REL_HDR) to the
2302 _bfd_elf_link_output_relocs (bfd *output_bfd,
2303 asection *input_section,
2304 Elf_Internal_Shdr *input_rel_hdr,
2305 Elf_Internal_Rela *internal_relocs,
2306 struct elf_link_hash_entry **rel_hash
2309 Elf_Internal_Rela *irela;
2310 Elf_Internal_Rela *irelaend;
2312 struct bfd_elf_section_reloc_data *output_reldata;
2313 asection *output_section;
2314 const struct elf_backend_data *bed;
2315 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2316 struct bfd_elf_section_data *esdo;
2318 output_section = input_section->output_section;
2320 bed = get_elf_backend_data (output_bfd);
2321 esdo = elf_section_data (output_section);
2322 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2324 output_reldata = &esdo->rel;
2325 swap_out = bed->s->swap_reloc_out;
2327 else if (esdo->rela.hdr
2328 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2330 output_reldata = &esdo->rela;
2331 swap_out = bed->s->swap_reloca_out;
2335 (*_bfd_error_handler)
2336 (_("%B: relocation size mismatch in %B section %A"),
2337 output_bfd, input_section->owner, input_section);
2338 bfd_set_error (bfd_error_wrong_format);
2342 erel = output_reldata->hdr->contents;
2343 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2344 irela = internal_relocs;
2345 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2346 * bed->s->int_rels_per_ext_rel);
2347 while (irela < irelaend)
2349 (*swap_out) (output_bfd, irela, erel);
2350 irela += bed->s->int_rels_per_ext_rel;
2351 erel += input_rel_hdr->sh_entsize;
2354 /* Bump the counter, so that we know where to add the next set of
2356 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2361 /* Make weak undefined symbols in PIE dynamic. */
2364 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2365 struct elf_link_hash_entry *h)
2369 && h->root.type == bfd_link_hash_undefweak)
2370 return bfd_elf_link_record_dynamic_symbol (info, h);
2375 /* Fix up the flags for a symbol. This handles various cases which
2376 can only be fixed after all the input files are seen. This is
2377 currently called by both adjust_dynamic_symbol and
2378 assign_sym_version, which is unnecessary but perhaps more robust in
2379 the face of future changes. */
2382 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2383 struct elf_info_failed *eif)
2385 const struct elf_backend_data *bed;
2387 /* If this symbol was mentioned in a non-ELF file, try to set
2388 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2389 permit a non-ELF file to correctly refer to a symbol defined in
2390 an ELF dynamic object. */
2393 while (h->root.type == bfd_link_hash_indirect)
2394 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2396 if (h->root.type != bfd_link_hash_defined
2397 && h->root.type != bfd_link_hash_defweak)
2400 h->ref_regular_nonweak = 1;
2404 if (h->root.u.def.section->owner != NULL
2405 && (bfd_get_flavour (h->root.u.def.section->owner)
2406 == bfd_target_elf_flavour))
2409 h->ref_regular_nonweak = 1;
2415 if (h->dynindx == -1
2419 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2428 /* Unfortunately, NON_ELF is only correct if the symbol
2429 was first seen in a non-ELF file. Fortunately, if the symbol
2430 was first seen in an ELF file, we're probably OK unless the
2431 symbol was defined in a non-ELF file. Catch that case here.
2432 FIXME: We're still in trouble if the symbol was first seen in
2433 a dynamic object, and then later in a non-ELF regular object. */
2434 if ((h->root.type == bfd_link_hash_defined
2435 || h->root.type == bfd_link_hash_defweak)
2437 && (h->root.u.def.section->owner != NULL
2438 ? (bfd_get_flavour (h->root.u.def.section->owner)
2439 != bfd_target_elf_flavour)
2440 : (bfd_is_abs_section (h->root.u.def.section)
2441 && !h->def_dynamic)))
2445 /* Backend specific symbol fixup. */
2446 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2447 if (bed->elf_backend_fixup_symbol
2448 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2451 /* If this is a final link, and the symbol was defined as a common
2452 symbol in a regular object file, and there was no definition in
2453 any dynamic object, then the linker will have allocated space for
2454 the symbol in a common section but the DEF_REGULAR
2455 flag will not have been set. */
2456 if (h->root.type == bfd_link_hash_defined
2460 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2463 /* If -Bsymbolic was used (which means to bind references to global
2464 symbols to the definition within the shared object), and this
2465 symbol was defined in a regular object, then it actually doesn't
2466 need a PLT entry. Likewise, if the symbol has non-default
2467 visibility. If the symbol has hidden or internal visibility, we
2468 will force it local. */
2470 && eif->info->shared
2471 && is_elf_hash_table (eif->info->hash)
2472 && (SYMBOLIC_BIND (eif->info, h)
2473 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2476 bfd_boolean force_local;
2478 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2479 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2480 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2483 /* If a weak undefined symbol has non-default visibility, we also
2484 hide it from the dynamic linker. */
2485 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2486 && h->root.type == bfd_link_hash_undefweak)
2487 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2489 /* If this is a weak defined symbol in a dynamic object, and we know
2490 the real definition in the dynamic object, copy interesting flags
2491 over to the real definition. */
2492 if (h->u.weakdef != NULL)
2494 /* If the real definition is defined by a regular object file,
2495 don't do anything special. See the longer description in
2496 _bfd_elf_adjust_dynamic_symbol, below. */
2497 if (h->u.weakdef->def_regular)
2498 h->u.weakdef = NULL;
2501 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2503 while (h->root.type == bfd_link_hash_indirect)
2504 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2506 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2507 || h->root.type == bfd_link_hash_defweak);
2508 BFD_ASSERT (weakdef->def_dynamic);
2509 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2510 || weakdef->root.type == bfd_link_hash_defweak);
2511 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2518 /* Make the backend pick a good value for a dynamic symbol. This is
2519 called via elf_link_hash_traverse, and also calls itself
2523 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2525 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2527 const struct elf_backend_data *bed;
2529 if (! is_elf_hash_table (eif->info->hash))
2532 /* Ignore indirect symbols. These are added by the versioning code. */
2533 if (h->root.type == bfd_link_hash_indirect)
2536 /* Fix the symbol flags. */
2537 if (! _bfd_elf_fix_symbol_flags (h, eif))
2540 /* If this symbol does not require a PLT entry, and it is not
2541 defined by a dynamic object, or is not referenced by a regular
2542 object, ignore it. We do have to handle a weak defined symbol,
2543 even if no regular object refers to it, if we decided to add it
2544 to the dynamic symbol table. FIXME: Do we normally need to worry
2545 about symbols which are defined by one dynamic object and
2546 referenced by another one? */
2548 && h->type != STT_GNU_IFUNC
2552 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2554 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2558 /* If we've already adjusted this symbol, don't do it again. This
2559 can happen via a recursive call. */
2560 if (h->dynamic_adjusted)
2563 /* Don't look at this symbol again. Note that we must set this
2564 after checking the above conditions, because we may look at a
2565 symbol once, decide not to do anything, and then get called
2566 recursively later after REF_REGULAR is set below. */
2567 h->dynamic_adjusted = 1;
2569 /* If this is a weak definition, and we know a real definition, and
2570 the real symbol is not itself defined by a regular object file,
2571 then get a good value for the real definition. We handle the
2572 real symbol first, for the convenience of the backend routine.
2574 Note that there is a confusing case here. If the real definition
2575 is defined by a regular object file, we don't get the real symbol
2576 from the dynamic object, but we do get the weak symbol. If the
2577 processor backend uses a COPY reloc, then if some routine in the
2578 dynamic object changes the real symbol, we will not see that
2579 change in the corresponding weak symbol. This is the way other
2580 ELF linkers work as well, and seems to be a result of the shared
2583 I will clarify this issue. Most SVR4 shared libraries define the
2584 variable _timezone and define timezone as a weak synonym. The
2585 tzset call changes _timezone. If you write
2586 extern int timezone;
2588 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2589 you might expect that, since timezone is a synonym for _timezone,
2590 the same number will print both times. However, if the processor
2591 backend uses a COPY reloc, then actually timezone will be copied
2592 into your process image, and, since you define _timezone
2593 yourself, _timezone will not. Thus timezone and _timezone will
2594 wind up at different memory locations. The tzset call will set
2595 _timezone, leaving timezone unchanged. */
2597 if (h->u.weakdef != NULL)
2599 /* If we get to this point, there is an implicit reference to
2600 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2601 h->u.weakdef->ref_regular = 1;
2603 /* Ensure that the backend adjust_dynamic_symbol function sees
2604 H->U.WEAKDEF before H by recursively calling ourselves. */
2605 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2609 /* If a symbol has no type and no size and does not require a PLT
2610 entry, then we are probably about to do the wrong thing here: we
2611 are probably going to create a COPY reloc for an empty object.
2612 This case can arise when a shared object is built with assembly
2613 code, and the assembly code fails to set the symbol type. */
2615 && h->type == STT_NOTYPE
2617 (*_bfd_error_handler)
2618 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2619 h->root.root.string);
2621 dynobj = elf_hash_table (eif->info)->dynobj;
2622 bed = get_elf_backend_data (dynobj);
2624 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2633 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2637 _bfd_elf_adjust_dynamic_copy (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;
2679 /* Adjust all external symbols pointing into SEC_MERGE sections
2680 to reflect the object merging within the sections. */
2683 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2687 if ((h->root.type == bfd_link_hash_defined
2688 || h->root.type == bfd_link_hash_defweak)
2689 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2690 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2692 bfd *output_bfd = (bfd *) data;
2694 h->root.u.def.value =
2695 _bfd_merged_section_offset (output_bfd,
2696 &h->root.u.def.section,
2697 elf_section_data (sec)->sec_info,
2698 h->root.u.def.value);
2704 /* Returns false if the symbol referred to by H should be considered
2705 to resolve local to the current module, and true if it should be
2706 considered to bind dynamically. */
2709 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2710 struct bfd_link_info *info,
2711 bfd_boolean not_local_protected)
2713 bfd_boolean binding_stays_local_p;
2714 const struct elf_backend_data *bed;
2715 struct elf_link_hash_table *hash_table;
2720 while (h->root.type == bfd_link_hash_indirect
2721 || h->root.type == bfd_link_hash_warning)
2722 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2724 /* If it was forced local, then clearly it's not dynamic. */
2725 if (h->dynindx == -1)
2727 if (h->forced_local)
2730 /* Identify the cases where name binding rules say that a
2731 visible symbol resolves locally. */
2732 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2734 switch (ELF_ST_VISIBILITY (h->other))
2741 hash_table = elf_hash_table (info);
2742 if (!is_elf_hash_table (hash_table))
2745 bed = get_elf_backend_data (hash_table->dynobj);
2747 /* Proper resolution for function pointer equality may require
2748 that these symbols perhaps be resolved dynamically, even though
2749 we should be resolving them to the current module. */
2750 if (!not_local_protected || !bed->is_function_type (h->type))
2751 binding_stays_local_p = TRUE;
2758 /* If it isn't defined locally, then clearly it's dynamic. */
2759 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2762 /* Otherwise, the symbol is dynamic if binding rules don't tell
2763 us that it remains local. */
2764 return !binding_stays_local_p;
2767 /* Return true if the symbol referred to by H should be considered
2768 to resolve local to the current module, and false otherwise. Differs
2769 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2770 undefined symbols. The two functions are virtually identical except
2771 for the place where forced_local and dynindx == -1 are tested. If
2772 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2773 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2774 the symbol is local only for defined symbols.
2775 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2776 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2777 treatment of undefined weak symbols. For those that do not make
2778 undefined weak symbols dynamic, both functions may return false. */
2781 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2782 struct bfd_link_info *info,
2783 bfd_boolean local_protected)
2785 const struct elf_backend_data *bed;
2786 struct elf_link_hash_table *hash_table;
2788 /* If it's a local sym, of course we resolve locally. */
2792 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2793 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2794 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2797 /* Common symbols that become definitions don't get the DEF_REGULAR
2798 flag set, so test it first, and don't bail out. */
2799 if (ELF_COMMON_DEF_P (h))
2801 /* If we don't have a definition in a regular file, then we can't
2802 resolve locally. The sym is either undefined or dynamic. */
2803 else if (!h->def_regular)
2806 /* Forced local symbols resolve locally. */
2807 if (h->forced_local)
2810 /* As do non-dynamic symbols. */
2811 if (h->dynindx == -1)
2814 /* At this point, we know the symbol is defined and dynamic. In an
2815 executable it must resolve locally, likewise when building symbolic
2816 shared libraries. */
2817 if (info->executable || SYMBOLIC_BIND (info, h))
2820 /* Now deal with defined dynamic symbols in shared libraries. Ones
2821 with default visibility might not resolve locally. */
2822 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2825 hash_table = elf_hash_table (info);
2826 if (!is_elf_hash_table (hash_table))
2829 bed = get_elf_backend_data (hash_table->dynobj);
2831 /* STV_PROTECTED non-function symbols are local. */
2832 if (!bed->is_function_type (h->type))
2835 /* Function pointer equality tests may require that STV_PROTECTED
2836 symbols be treated as dynamic symbols. If the address of a
2837 function not defined in an executable is set to that function's
2838 plt entry in the executable, then the address of the function in
2839 a shared library must also be the plt entry in the executable. */
2840 return local_protected;
2843 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2844 aligned. Returns the first TLS output section. */
2846 struct bfd_section *
2847 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2849 struct bfd_section *sec, *tls;
2850 unsigned int align = 0;
2852 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2853 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2857 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2858 if (sec->alignment_power > align)
2859 align = sec->alignment_power;
2861 elf_hash_table (info)->tls_sec = tls;
2863 /* Ensure the alignment of the first section is the largest alignment,
2864 so that the tls segment starts aligned. */
2866 tls->alignment_power = align;
2871 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2873 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2874 Elf_Internal_Sym *sym)
2876 const struct elf_backend_data *bed;
2878 /* Local symbols do not count, but target specific ones might. */
2879 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2880 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2883 bed = get_elf_backend_data (abfd);
2884 /* Function symbols do not count. */
2885 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2888 /* If the section is undefined, then so is the symbol. */
2889 if (sym->st_shndx == SHN_UNDEF)
2892 /* If the symbol is defined in the common section, then
2893 it is a common definition and so does not count. */
2894 if (bed->common_definition (sym))
2897 /* If the symbol is in a target specific section then we
2898 must rely upon the backend to tell us what it is. */
2899 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2900 /* FIXME - this function is not coded yet:
2902 return _bfd_is_global_symbol_definition (abfd, sym);
2904 Instead for now assume that the definition is not global,
2905 Even if this is wrong, at least the linker will behave
2906 in the same way that it used to do. */
2912 /* Search the symbol table of the archive element of the archive ABFD
2913 whose archive map contains a mention of SYMDEF, and determine if
2914 the symbol is defined in this element. */
2916 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2918 Elf_Internal_Shdr * hdr;
2919 bfd_size_type symcount;
2920 bfd_size_type extsymcount;
2921 bfd_size_type extsymoff;
2922 Elf_Internal_Sym *isymbuf;
2923 Elf_Internal_Sym *isym;
2924 Elf_Internal_Sym *isymend;
2927 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2931 if (! bfd_check_format (abfd, bfd_object))
2934 /* If we have already included the element containing this symbol in the
2935 link then we do not need to include it again. Just claim that any symbol
2936 it contains is not a definition, so that our caller will not decide to
2937 (re)include this element. */
2938 if (abfd->archive_pass)
2941 /* Select the appropriate symbol table. */
2942 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2943 hdr = &elf_tdata (abfd)->symtab_hdr;
2945 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2947 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2949 /* The sh_info field of the symtab header tells us where the
2950 external symbols start. We don't care about the local symbols. */
2951 if (elf_bad_symtab (abfd))
2953 extsymcount = symcount;
2958 extsymcount = symcount - hdr->sh_info;
2959 extsymoff = hdr->sh_info;
2962 if (extsymcount == 0)
2965 /* Read in the symbol table. */
2966 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2968 if (isymbuf == NULL)
2971 /* Scan the symbol table looking for SYMDEF. */
2973 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
2977 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
2982 if (strcmp (name, symdef->name) == 0)
2984 result = is_global_data_symbol_definition (abfd, isym);
2994 /* Add an entry to the .dynamic table. */
2997 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3001 struct elf_link_hash_table *hash_table;
3002 const struct elf_backend_data *bed;
3004 bfd_size_type newsize;
3005 bfd_byte *newcontents;
3006 Elf_Internal_Dyn dyn;
3008 hash_table = elf_hash_table (info);
3009 if (! is_elf_hash_table (hash_table))
3012 bed = get_elf_backend_data (hash_table->dynobj);
3013 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3014 BFD_ASSERT (s != NULL);
3016 newsize = s->size + bed->s->sizeof_dyn;
3017 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3018 if (newcontents == NULL)
3022 dyn.d_un.d_val = val;
3023 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3026 s->contents = newcontents;
3031 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3032 otherwise just check whether one already exists. Returns -1 on error,
3033 1 if a DT_NEEDED tag already exists, and 0 on success. */
3036 elf_add_dt_needed_tag (bfd *abfd,
3037 struct bfd_link_info *info,
3041 struct elf_link_hash_table *hash_table;
3042 bfd_size_type strindex;
3044 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3047 hash_table = elf_hash_table (info);
3048 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3049 if (strindex == (bfd_size_type) -1)
3052 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3055 const struct elf_backend_data *bed;
3058 bed = get_elf_backend_data (hash_table->dynobj);
3059 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3061 for (extdyn = sdyn->contents;
3062 extdyn < sdyn->contents + sdyn->size;
3063 extdyn += bed->s->sizeof_dyn)
3065 Elf_Internal_Dyn dyn;
3067 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3068 if (dyn.d_tag == DT_NEEDED
3069 && dyn.d_un.d_val == strindex)
3071 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3079 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3082 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3086 /* We were just checking for existence of the tag. */
3087 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3093 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3095 for (; needed != NULL; needed = needed->next)
3096 if (strcmp (soname, needed->name) == 0)
3102 /* Sort symbol by value, section, and size. */
3104 elf_sort_symbol (const void *arg1, const void *arg2)
3106 const struct elf_link_hash_entry *h1;
3107 const struct elf_link_hash_entry *h2;
3108 bfd_signed_vma vdiff;
3110 h1 = *(const struct elf_link_hash_entry **) arg1;
3111 h2 = *(const struct elf_link_hash_entry **) arg2;
3112 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3114 return vdiff > 0 ? 1 : -1;
3117 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3119 return sdiff > 0 ? 1 : -1;
3121 vdiff = h1->size - h2->size;
3122 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3125 /* This function is used to adjust offsets into .dynstr for
3126 dynamic symbols. This is called via elf_link_hash_traverse. */
3129 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3131 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3133 if (h->dynindx != -1)
3134 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3138 /* Assign string offsets in .dynstr, update all structures referencing
3142 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3144 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3145 struct elf_link_local_dynamic_entry *entry;
3146 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3147 bfd *dynobj = hash_table->dynobj;
3150 const struct elf_backend_data *bed;
3153 _bfd_elf_strtab_finalize (dynstr);
3154 size = _bfd_elf_strtab_size (dynstr);
3156 bed = get_elf_backend_data (dynobj);
3157 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3158 BFD_ASSERT (sdyn != NULL);
3160 /* Update all .dynamic entries referencing .dynstr strings. */
3161 for (extdyn = sdyn->contents;
3162 extdyn < sdyn->contents + sdyn->size;
3163 extdyn += bed->s->sizeof_dyn)
3165 Elf_Internal_Dyn dyn;
3167 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3171 dyn.d_un.d_val = size;
3181 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3186 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3189 /* Now update local dynamic symbols. */
3190 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3191 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3192 entry->isym.st_name);
3194 /* And the rest of dynamic symbols. */
3195 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3197 /* Adjust version definitions. */
3198 if (elf_tdata (output_bfd)->cverdefs)
3203 Elf_Internal_Verdef def;
3204 Elf_Internal_Verdaux defaux;
3206 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3210 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3212 p += sizeof (Elf_External_Verdef);
3213 if (def.vd_aux != sizeof (Elf_External_Verdef))
3215 for (i = 0; i < def.vd_cnt; ++i)
3217 _bfd_elf_swap_verdaux_in (output_bfd,
3218 (Elf_External_Verdaux *) p, &defaux);
3219 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3221 _bfd_elf_swap_verdaux_out (output_bfd,
3222 &defaux, (Elf_External_Verdaux *) p);
3223 p += sizeof (Elf_External_Verdaux);
3226 while (def.vd_next);
3229 /* Adjust version references. */
3230 if (elf_tdata (output_bfd)->verref)
3235 Elf_Internal_Verneed need;
3236 Elf_Internal_Vernaux needaux;
3238 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3242 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3244 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3245 _bfd_elf_swap_verneed_out (output_bfd, &need,
3246 (Elf_External_Verneed *) p);
3247 p += sizeof (Elf_External_Verneed);
3248 for (i = 0; i < need.vn_cnt; ++i)
3250 _bfd_elf_swap_vernaux_in (output_bfd,
3251 (Elf_External_Vernaux *) p, &needaux);
3252 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3254 _bfd_elf_swap_vernaux_out (output_bfd,
3256 (Elf_External_Vernaux *) p);
3257 p += sizeof (Elf_External_Vernaux);
3260 while (need.vn_next);
3266 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3267 The default is to only match when the INPUT and OUTPUT are exactly
3271 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3272 const bfd_target *output)
3274 return input == output;
3277 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3278 This version is used when different targets for the same architecture
3279 are virtually identical. */
3282 _bfd_elf_relocs_compatible (const bfd_target *input,
3283 const bfd_target *output)
3285 const struct elf_backend_data *obed, *ibed;
3287 if (input == output)
3290 ibed = xvec_get_elf_backend_data (input);
3291 obed = xvec_get_elf_backend_data (output);
3293 if (ibed->arch != obed->arch)
3296 /* If both backends are using this function, deem them compatible. */
3297 return ibed->relocs_compatible == obed->relocs_compatible;
3300 /* Make a special call to the linker "notice" function to tell it that
3301 we are about to handle an as-needed lib, or have finished
3302 processing the lib. */
3305 _bfd_elf_notice_as_needed (bfd *ibfd,
3306 struct bfd_link_info *info,
3307 enum notice_asneeded_action act)
3309 return (*info->callbacks->notice) (info, NULL, ibfd, NULL, act, 0, NULL);
3312 /* Add symbols from an ELF object file to the linker hash table. */
3315 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3317 Elf_Internal_Ehdr *ehdr;
3318 Elf_Internal_Shdr *hdr;
3319 bfd_size_type symcount;
3320 bfd_size_type extsymcount;
3321 bfd_size_type extsymoff;
3322 struct elf_link_hash_entry **sym_hash;
3323 bfd_boolean dynamic;
3324 Elf_External_Versym *extversym = NULL;
3325 Elf_External_Versym *ever;
3326 struct elf_link_hash_entry *weaks;
3327 struct elf_link_hash_entry **nondeflt_vers = NULL;
3328 bfd_size_type nondeflt_vers_cnt = 0;
3329 Elf_Internal_Sym *isymbuf = NULL;
3330 Elf_Internal_Sym *isym;
3331 Elf_Internal_Sym *isymend;
3332 const struct elf_backend_data *bed;
3333 bfd_boolean add_needed;
3334 struct elf_link_hash_table *htab;
3336 void *alloc_mark = NULL;
3337 struct bfd_hash_entry **old_table = NULL;
3338 unsigned int old_size = 0;
3339 unsigned int old_count = 0;
3340 void *old_tab = NULL;
3342 struct bfd_link_hash_entry *old_undefs = NULL;
3343 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3344 long old_dynsymcount = 0;
3345 bfd_size_type old_dynstr_size = 0;
3349 htab = elf_hash_table (info);
3350 bed = get_elf_backend_data (abfd);
3352 if ((abfd->flags & DYNAMIC) == 0)
3358 /* You can't use -r against a dynamic object. Also, there's no
3359 hope of using a dynamic object which does not exactly match
3360 the format of the output file. */
3361 if (info->relocatable
3362 || !is_elf_hash_table (htab)
3363 || info->output_bfd->xvec != abfd->xvec)
3365 if (info->relocatable)
3366 bfd_set_error (bfd_error_invalid_operation);
3368 bfd_set_error (bfd_error_wrong_format);
3373 ehdr = elf_elfheader (abfd);
3374 if (info->warn_alternate_em
3375 && bed->elf_machine_code != ehdr->e_machine
3376 && ((bed->elf_machine_alt1 != 0
3377 && ehdr->e_machine == bed->elf_machine_alt1)
3378 || (bed->elf_machine_alt2 != 0
3379 && ehdr->e_machine == bed->elf_machine_alt2)))
3380 info->callbacks->einfo
3381 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3382 ehdr->e_machine, abfd, bed->elf_machine_code);
3384 /* As a GNU extension, any input sections which are named
3385 .gnu.warning.SYMBOL are treated as warning symbols for the given
3386 symbol. This differs from .gnu.warning sections, which generate
3387 warnings when they are included in an output file. */
3388 /* PR 12761: Also generate this warning when building shared libraries. */
3389 for (s = abfd->sections; s != NULL; s = s->next)
3393 name = bfd_get_section_name (abfd, s);
3394 if (CONST_STRNEQ (name, ".gnu.warning."))
3399 name += sizeof ".gnu.warning." - 1;
3401 /* If this is a shared object, then look up the symbol
3402 in the hash table. If it is there, and it is already
3403 been defined, then we will not be using the entry
3404 from this shared object, so we don't need to warn.
3405 FIXME: If we see the definition in a regular object
3406 later on, we will warn, but we shouldn't. The only
3407 fix is to keep track of what warnings we are supposed
3408 to emit, and then handle them all at the end of the
3412 struct elf_link_hash_entry *h;
3414 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3416 /* FIXME: What about bfd_link_hash_common? */
3418 && (h->root.type == bfd_link_hash_defined
3419 || h->root.type == bfd_link_hash_defweak))
3424 msg = (char *) bfd_alloc (abfd, sz + 1);
3428 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3433 if (! (_bfd_generic_link_add_one_symbol
3434 (info, abfd, name, BSF_WARNING, s, 0, msg,
3435 FALSE, bed->collect, NULL)))
3438 if (!info->relocatable && info->executable)
3440 /* Clobber the section size so that the warning does
3441 not get copied into the output file. */
3444 /* Also set SEC_EXCLUDE, so that symbols defined in
3445 the warning section don't get copied to the output. */
3446 s->flags |= SEC_EXCLUDE;
3454 /* If we are creating a shared library, create all the dynamic
3455 sections immediately. We need to attach them to something,
3456 so we attach them to this BFD, provided it is the right
3457 format. FIXME: If there are no input BFD's of the same
3458 format as the output, we can't make a shared library. */
3460 && is_elf_hash_table (htab)
3461 && info->output_bfd->xvec == abfd->xvec
3462 && !htab->dynamic_sections_created)
3464 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3468 else if (!is_elf_hash_table (htab))
3472 const char *soname = NULL;
3474 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3477 /* ld --just-symbols and dynamic objects don't mix very well.
3478 ld shouldn't allow it. */
3479 if ((s = abfd->sections) != NULL
3480 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3483 /* If this dynamic lib was specified on the command line with
3484 --as-needed in effect, then we don't want to add a DT_NEEDED
3485 tag unless the lib is actually used. Similary for libs brought
3486 in by another lib's DT_NEEDED. When --no-add-needed is used
3487 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3488 any dynamic library in DT_NEEDED tags in the dynamic lib at
3490 add_needed = (elf_dyn_lib_class (abfd)
3491 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3492 | DYN_NO_NEEDED)) == 0;
3494 s = bfd_get_section_by_name (abfd, ".dynamic");
3499 unsigned int elfsec;
3500 unsigned long shlink;
3502 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3509 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3510 if (elfsec == SHN_BAD)
3511 goto error_free_dyn;
3512 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3514 for (extdyn = dynbuf;
3515 extdyn < dynbuf + s->size;
3516 extdyn += bed->s->sizeof_dyn)
3518 Elf_Internal_Dyn dyn;
3520 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3521 if (dyn.d_tag == DT_SONAME)
3523 unsigned int tagv = dyn.d_un.d_val;
3524 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3526 goto error_free_dyn;
3528 if (dyn.d_tag == DT_NEEDED)
3530 struct bfd_link_needed_list *n, **pn;
3532 unsigned int tagv = dyn.d_un.d_val;
3534 amt = sizeof (struct bfd_link_needed_list);
3535 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3536 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3537 if (n == NULL || fnm == NULL)
3538 goto error_free_dyn;
3539 amt = strlen (fnm) + 1;
3540 anm = (char *) bfd_alloc (abfd, amt);
3542 goto error_free_dyn;
3543 memcpy (anm, fnm, amt);
3547 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3551 if (dyn.d_tag == DT_RUNPATH)
3553 struct bfd_link_needed_list *n, **pn;
3555 unsigned int tagv = dyn.d_un.d_val;
3557 amt = sizeof (struct bfd_link_needed_list);
3558 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3559 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3560 if (n == NULL || fnm == NULL)
3561 goto error_free_dyn;
3562 amt = strlen (fnm) + 1;
3563 anm = (char *) bfd_alloc (abfd, amt);
3565 goto error_free_dyn;
3566 memcpy (anm, fnm, amt);
3570 for (pn = & runpath;
3576 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3577 if (!runpath && dyn.d_tag == DT_RPATH)
3579 struct bfd_link_needed_list *n, **pn;
3581 unsigned int tagv = dyn.d_un.d_val;
3583 amt = sizeof (struct bfd_link_needed_list);
3584 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3585 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3586 if (n == NULL || fnm == NULL)
3587 goto error_free_dyn;
3588 amt = strlen (fnm) + 1;
3589 anm = (char *) bfd_alloc (abfd, amt);
3591 goto error_free_dyn;
3592 memcpy (anm, fnm, amt);
3602 if (dyn.d_tag == DT_AUDIT)
3604 unsigned int tagv = dyn.d_un.d_val;
3605 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3612 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3613 frees all more recently bfd_alloc'd blocks as well. */
3619 struct bfd_link_needed_list **pn;
3620 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3625 /* We do not want to include any of the sections in a dynamic
3626 object in the output file. We hack by simply clobbering the
3627 list of sections in the BFD. This could be handled more
3628 cleanly by, say, a new section flag; the existing
3629 SEC_NEVER_LOAD flag is not the one we want, because that one
3630 still implies that the section takes up space in the output
3632 bfd_section_list_clear (abfd);
3634 /* Find the name to use in a DT_NEEDED entry that refers to this
3635 object. If the object has a DT_SONAME entry, we use it.
3636 Otherwise, if the generic linker stuck something in
3637 elf_dt_name, we use that. Otherwise, we just use the file
3639 if (soname == NULL || *soname == '\0')
3641 soname = elf_dt_name (abfd);
3642 if (soname == NULL || *soname == '\0')
3643 soname = bfd_get_filename (abfd);
3646 /* Save the SONAME because sometimes the linker emulation code
3647 will need to know it. */
3648 elf_dt_name (abfd) = soname;
3650 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3654 /* If we have already included this dynamic object in the
3655 link, just ignore it. There is no reason to include a
3656 particular dynamic object more than once. */
3660 /* Save the DT_AUDIT entry for the linker emulation code. */
3661 elf_dt_audit (abfd) = audit;
3664 /* If this is a dynamic object, we always link against the .dynsym
3665 symbol table, not the .symtab symbol table. The dynamic linker
3666 will only see the .dynsym symbol table, so there is no reason to
3667 look at .symtab for a dynamic object. */
3669 if (! dynamic || elf_dynsymtab (abfd) == 0)
3670 hdr = &elf_tdata (abfd)->symtab_hdr;
3672 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3674 symcount = hdr->sh_size / bed->s->sizeof_sym;
3676 /* The sh_info field of the symtab header tells us where the
3677 external symbols start. We don't care about the local symbols at
3679 if (elf_bad_symtab (abfd))
3681 extsymcount = symcount;
3686 extsymcount = symcount - hdr->sh_info;
3687 extsymoff = hdr->sh_info;
3690 sym_hash = elf_sym_hashes (abfd);
3691 if (extsymcount != 0)
3693 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3695 if (isymbuf == NULL)
3698 if (sym_hash == NULL)
3700 /* We store a pointer to the hash table entry for each
3702 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3703 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
3704 if (sym_hash == NULL)
3705 goto error_free_sym;
3706 elf_sym_hashes (abfd) = sym_hash;
3712 /* Read in any version definitions. */
3713 if (!_bfd_elf_slurp_version_tables (abfd,
3714 info->default_imported_symver))
3715 goto error_free_sym;
3717 /* Read in the symbol versions, but don't bother to convert them
3718 to internal format. */
3719 if (elf_dynversym (abfd) != 0)
3721 Elf_Internal_Shdr *versymhdr;
3723 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3724 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3725 if (extversym == NULL)
3726 goto error_free_sym;
3727 amt = versymhdr->sh_size;
3728 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3729 || bfd_bread (extversym, amt, abfd) != amt)
3730 goto error_free_vers;
3734 /* If we are loading an as-needed shared lib, save the symbol table
3735 state before we start adding symbols. If the lib turns out
3736 to be unneeded, restore the state. */
3737 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3742 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3744 struct bfd_hash_entry *p;
3745 struct elf_link_hash_entry *h;
3747 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3749 h = (struct elf_link_hash_entry *) p;
3750 entsize += htab->root.table.entsize;
3751 if (h->root.type == bfd_link_hash_warning)
3752 entsize += htab->root.table.entsize;
3756 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3757 old_tab = bfd_malloc (tabsize + entsize);
3758 if (old_tab == NULL)
3759 goto error_free_vers;
3761 /* Remember the current objalloc pointer, so that all mem for
3762 symbols added can later be reclaimed. */
3763 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3764 if (alloc_mark == NULL)
3765 goto error_free_vers;
3767 /* Make a special call to the linker "notice" function to
3768 tell it that we are about to handle an as-needed lib. */
3769 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
3770 goto error_free_vers;
3772 /* Clone the symbol table. Remember some pointers into the
3773 symbol table, and dynamic symbol count. */
3774 old_ent = (char *) old_tab + tabsize;
3775 memcpy (old_tab, htab->root.table.table, tabsize);
3776 old_undefs = htab->root.undefs;
3777 old_undefs_tail = htab->root.undefs_tail;
3778 old_table = htab->root.table.table;
3779 old_size = htab->root.table.size;
3780 old_count = htab->root.table.count;
3781 old_dynsymcount = htab->dynsymcount;
3782 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
3784 for (i = 0; i < htab->root.table.size; i++)
3786 struct bfd_hash_entry *p;
3787 struct elf_link_hash_entry *h;
3789 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3791 memcpy (old_ent, p, htab->root.table.entsize);
3792 old_ent = (char *) old_ent + htab->root.table.entsize;
3793 h = (struct elf_link_hash_entry *) p;
3794 if (h->root.type == bfd_link_hash_warning)
3796 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3797 old_ent = (char *) old_ent + htab->root.table.entsize;
3804 ever = extversym != NULL ? extversym + extsymoff : NULL;
3805 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3807 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3811 asection *sec, *new_sec;
3814 struct elf_link_hash_entry *h;
3815 struct elf_link_hash_entry *hi;
3816 bfd_boolean definition;
3817 bfd_boolean size_change_ok;
3818 bfd_boolean type_change_ok;
3819 bfd_boolean new_weakdef;
3820 bfd_boolean new_weak;
3821 bfd_boolean old_weak;
3822 bfd_boolean override;
3824 unsigned int old_alignment;
3829 flags = BSF_NO_FLAGS;
3831 value = isym->st_value;
3832 common = bed->common_definition (isym);
3834 bind = ELF_ST_BIND (isym->st_info);
3838 /* This should be impossible, since ELF requires that all
3839 global symbols follow all local symbols, and that sh_info
3840 point to the first global symbol. Unfortunately, Irix 5
3845 if (isym->st_shndx != SHN_UNDEF && !common)
3853 case STB_GNU_UNIQUE:
3854 flags = BSF_GNU_UNIQUE;
3858 /* Leave it up to the processor backend. */
3862 if (isym->st_shndx == SHN_UNDEF)
3863 sec = bfd_und_section_ptr;
3864 else if (isym->st_shndx == SHN_ABS)
3865 sec = bfd_abs_section_ptr;
3866 else if (isym->st_shndx == SHN_COMMON)
3868 sec = bfd_com_section_ptr;
3869 /* What ELF calls the size we call the value. What ELF
3870 calls the value we call the alignment. */
3871 value = isym->st_size;
3875 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3877 sec = bfd_abs_section_ptr;
3878 else if (discarded_section (sec))
3880 /* Symbols from discarded section are undefined. We keep
3882 sec = bfd_und_section_ptr;
3883 isym->st_shndx = SHN_UNDEF;
3885 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3889 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3892 goto error_free_vers;
3894 if (isym->st_shndx == SHN_COMMON
3895 && (abfd->flags & BFD_PLUGIN) != 0)
3897 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
3901 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
3903 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
3905 goto error_free_vers;
3909 else if (isym->st_shndx == SHN_COMMON
3910 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3911 && !info->relocatable)
3913 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3917 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
3918 | SEC_LINKER_CREATED);
3919 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
3921 goto error_free_vers;
3925 else if (bed->elf_add_symbol_hook)
3927 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3929 goto error_free_vers;
3931 /* The hook function sets the name to NULL if this symbol
3932 should be skipped for some reason. */
3937 /* Sanity check that all possibilities were handled. */
3940 bfd_set_error (bfd_error_bad_value);
3941 goto error_free_vers;
3944 /* Silently discard TLS symbols from --just-syms. There's
3945 no way to combine a static TLS block with a new TLS block
3946 for this executable. */
3947 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
3948 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3951 if (bfd_is_und_section (sec)
3952 || bfd_is_com_section (sec))
3957 size_change_ok = FALSE;
3958 type_change_ok = bed->type_change_ok;
3964 if (is_elf_hash_table (htab))
3966 Elf_Internal_Versym iver;
3967 unsigned int vernum = 0;
3972 if (info->default_imported_symver)
3973 /* Use the default symbol version created earlier. */
3974 iver.vs_vers = elf_tdata (abfd)->cverdefs;
3979 _bfd_elf_swap_versym_in (abfd, ever, &iver);
3981 vernum = iver.vs_vers & VERSYM_VERSION;
3983 /* If this is a hidden symbol, or if it is not version
3984 1, we append the version name to the symbol name.
3985 However, we do not modify a non-hidden absolute symbol
3986 if it is not a function, because it might be the version
3987 symbol itself. FIXME: What if it isn't? */
3988 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
3990 && (!bfd_is_abs_section (sec)
3991 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
3994 size_t namelen, verlen, newlen;
3997 if (isym->st_shndx != SHN_UNDEF)
3999 if (vernum > elf_tdata (abfd)->cverdefs)
4001 else if (vernum > 1)
4003 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4009 (*_bfd_error_handler)
4010 (_("%B: %s: invalid version %u (max %d)"),
4012 elf_tdata (abfd)->cverdefs);
4013 bfd_set_error (bfd_error_bad_value);
4014 goto error_free_vers;
4019 /* We cannot simply test for the number of
4020 entries in the VERNEED section since the
4021 numbers for the needed versions do not start
4023 Elf_Internal_Verneed *t;
4026 for (t = elf_tdata (abfd)->verref;
4030 Elf_Internal_Vernaux *a;
4032 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4034 if (a->vna_other == vernum)
4036 verstr = a->vna_nodename;
4045 (*_bfd_error_handler)
4046 (_("%B: %s: invalid needed version %d"),
4047 abfd, name, vernum);
4048 bfd_set_error (bfd_error_bad_value);
4049 goto error_free_vers;
4053 namelen = strlen (name);
4054 verlen = strlen (verstr);
4055 newlen = namelen + verlen + 2;
4056 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4057 && isym->st_shndx != SHN_UNDEF)
4060 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4061 if (newname == NULL)
4062 goto error_free_vers;
4063 memcpy (newname, name, namelen);
4064 p = newname + namelen;
4066 /* If this is a defined non-hidden version symbol,
4067 we add another @ to the name. This indicates the
4068 default version of the symbol. */
4069 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4070 && isym->st_shndx != SHN_UNDEF)
4072 memcpy (p, verstr, verlen + 1);
4077 /* If this symbol has default visibility and the user has
4078 requested we not re-export it, then mark it as hidden. */
4082 || (abfd->my_archive && abfd->my_archive->no_export))
4083 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4084 isym->st_other = (STV_HIDDEN
4085 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4087 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4088 sym_hash, &old_bfd, &old_weak,
4089 &old_alignment, &skip, &override,
4090 &type_change_ok, &size_change_ok))
4091 goto error_free_vers;
4100 while (h->root.type == bfd_link_hash_indirect
4101 || h->root.type == bfd_link_hash_warning)
4102 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4104 if (elf_tdata (abfd)->verdef != NULL
4107 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4110 if (! (_bfd_generic_link_add_one_symbol
4111 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4112 (struct bfd_link_hash_entry **) sym_hash)))
4113 goto error_free_vers;
4116 /* We need to make sure that indirect symbol dynamic flags are
4119 while (h->root.type == bfd_link_hash_indirect
4120 || h->root.type == bfd_link_hash_warning)
4121 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4125 new_weak = (flags & BSF_WEAK) != 0;
4126 new_weakdef = FALSE;
4130 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4131 && is_elf_hash_table (htab)
4132 && h->u.weakdef == NULL)
4134 /* Keep a list of all weak defined non function symbols from
4135 a dynamic object, using the weakdef field. Later in this
4136 function we will set the weakdef field to the correct
4137 value. We only put non-function symbols from dynamic
4138 objects on this list, because that happens to be the only
4139 time we need to know the normal symbol corresponding to a
4140 weak symbol, and the information is time consuming to
4141 figure out. If the weakdef field is not already NULL,
4142 then this symbol was already defined by some previous
4143 dynamic object, and we will be using that previous
4144 definition anyhow. */
4146 h->u.weakdef = weaks;
4151 /* Set the alignment of a common symbol. */
4152 if ((common || bfd_is_com_section (sec))
4153 && h->root.type == bfd_link_hash_common)
4158 align = bfd_log2 (isym->st_value);
4161 /* The new symbol is a common symbol in a shared object.
4162 We need to get the alignment from the section. */
4163 align = new_sec->alignment_power;
4165 if (align > old_alignment)
4166 h->root.u.c.p->alignment_power = align;
4168 h->root.u.c.p->alignment_power = old_alignment;
4171 if (is_elf_hash_table (htab))
4173 /* Set a flag in the hash table entry indicating the type of
4174 reference or definition we just found. A dynamic symbol
4175 is one which is referenced or defined by both a regular
4176 object and a shared object. */
4177 bfd_boolean dynsym = FALSE;
4179 /* Plugin symbols aren't normal. Don't set def_regular or
4180 ref_regular for them, or make them dynamic. */
4181 if ((abfd->flags & BFD_PLUGIN) != 0)
4188 if (bind != STB_WEAK)
4189 h->ref_regular_nonweak = 1;
4201 /* If the indirect symbol has been forced local, don't
4202 make the real symbol dynamic. */
4203 if ((h == hi || !hi->forced_local)
4204 && (! info->executable
4214 hi->ref_dynamic = 1;
4219 hi->def_dynamic = 1;
4222 /* If the indirect symbol has been forced local, don't
4223 make the real symbol dynamic. */
4224 if ((h == hi || !hi->forced_local)
4227 || (h->u.weakdef != NULL
4229 && h->u.weakdef->dynindx != -1)))
4233 /* Check to see if we need to add an indirect symbol for
4234 the default name. */
4236 || (!override && h->root.type == bfd_link_hash_common))
4237 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4238 sec, value, &old_bfd, &dynsym))
4239 goto error_free_vers;
4241 /* Check the alignment when a common symbol is involved. This
4242 can change when a common symbol is overridden by a normal
4243 definition or a common symbol is ignored due to the old
4244 normal definition. We need to make sure the maximum
4245 alignment is maintained. */
4246 if ((old_alignment || common)
4247 && h->root.type != bfd_link_hash_common)
4249 unsigned int common_align;
4250 unsigned int normal_align;
4251 unsigned int symbol_align;
4255 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4256 || h->root.type == bfd_link_hash_defweak);
4258 symbol_align = ffs (h->root.u.def.value) - 1;
4259 if (h->root.u.def.section->owner != NULL
4260 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4262 normal_align = h->root.u.def.section->alignment_power;
4263 if (normal_align > symbol_align)
4264 normal_align = symbol_align;
4267 normal_align = symbol_align;
4271 common_align = old_alignment;
4272 common_bfd = old_bfd;
4277 common_align = bfd_log2 (isym->st_value);
4279 normal_bfd = old_bfd;
4282 if (normal_align < common_align)
4284 /* PR binutils/2735 */
4285 if (normal_bfd == NULL)
4286 (*_bfd_error_handler)
4287 (_("Warning: alignment %u of common symbol `%s' in %B is"
4288 " greater than the alignment (%u) of its section %A"),
4289 common_bfd, h->root.u.def.section,
4290 1 << common_align, name, 1 << normal_align);
4292 (*_bfd_error_handler)
4293 (_("Warning: alignment %u of symbol `%s' in %B"
4294 " is smaller than %u in %B"),
4295 normal_bfd, common_bfd,
4296 1 << normal_align, name, 1 << common_align);
4300 /* Remember the symbol size if it isn't undefined. */
4301 if (isym->st_size != 0
4302 && isym->st_shndx != SHN_UNDEF
4303 && (definition || h->size == 0))
4306 && h->size != isym->st_size
4307 && ! size_change_ok)
4308 (*_bfd_error_handler)
4309 (_("Warning: size of symbol `%s' changed"
4310 " from %lu in %B to %lu in %B"),
4312 name, (unsigned long) h->size,
4313 (unsigned long) isym->st_size);
4315 h->size = isym->st_size;
4318 /* If this is a common symbol, then we always want H->SIZE
4319 to be the size of the common symbol. The code just above
4320 won't fix the size if a common symbol becomes larger. We
4321 don't warn about a size change here, because that is
4322 covered by --warn-common. Allow changes between different
4324 if (h->root.type == bfd_link_hash_common)
4325 h->size = h->root.u.c.size;
4327 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4328 && ((definition && !new_weak)
4329 || (old_weak && h->root.type == bfd_link_hash_common)
4330 || h->type == STT_NOTYPE))
4332 unsigned int type = ELF_ST_TYPE (isym->st_info);
4334 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4336 if (type == STT_GNU_IFUNC
4337 && (abfd->flags & DYNAMIC) != 0)
4340 if (h->type != type)
4342 if (h->type != STT_NOTYPE && ! type_change_ok)
4343 (*_bfd_error_handler)
4344 (_("Warning: type of symbol `%s' changed"
4345 " from %d to %d in %B"),
4346 abfd, name, h->type, type);
4352 /* Merge st_other field. */
4353 elf_merge_st_other (abfd, h, isym, definition, dynamic);
4355 /* We don't want to make debug symbol dynamic. */
4356 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4359 /* Nor should we make plugin symbols dynamic. */
4360 if ((abfd->flags & BFD_PLUGIN) != 0)
4365 h->target_internal = isym->st_target_internal;
4366 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4369 if (definition && !dynamic)
4371 char *p = strchr (name, ELF_VER_CHR);
4372 if (p != NULL && p[1] != ELF_VER_CHR)
4374 /* Queue non-default versions so that .symver x, x@FOO
4375 aliases can be checked. */
4378 amt = ((isymend - isym + 1)
4379 * sizeof (struct elf_link_hash_entry *));
4381 (struct elf_link_hash_entry **) bfd_malloc (amt);
4383 goto error_free_vers;
4385 nondeflt_vers[nondeflt_vers_cnt++] = h;
4389 if (dynsym && h->dynindx == -1)
4391 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4392 goto error_free_vers;
4393 if (h->u.weakdef != NULL
4395 && h->u.weakdef->dynindx == -1)
4397 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4398 goto error_free_vers;
4401 else if (dynsym && h->dynindx != -1)
4402 /* If the symbol already has a dynamic index, but
4403 visibility says it should not be visible, turn it into
4405 switch (ELF_ST_VISIBILITY (h->other))
4409 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4414 /* Don't add DT_NEEDED for references from the dummy bfd. */
4418 && h->ref_regular_nonweak
4420 || (old_bfd->flags & BFD_PLUGIN) == 0))
4421 || (h->ref_dynamic_nonweak
4422 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4423 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4426 const char *soname = elf_dt_name (abfd);
4428 info->callbacks->minfo ("%!", soname, old_bfd,
4429 h->root.root.string);
4431 /* A symbol from a library loaded via DT_NEEDED of some
4432 other library is referenced by a regular object.
4433 Add a DT_NEEDED entry for it. Issue an error if
4434 --no-add-needed is used and the reference was not
4437 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4439 (*_bfd_error_handler)
4440 (_("%B: undefined reference to symbol '%s'"),
4442 bfd_set_error (bfd_error_missing_dso);
4443 goto error_free_vers;
4446 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4447 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4450 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4452 goto error_free_vers;
4454 BFD_ASSERT (ret == 0);
4459 if (extversym != NULL)
4465 if (isymbuf != NULL)
4471 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4475 /* Restore the symbol table. */
4476 old_ent = (char *) old_tab + tabsize;
4477 memset (elf_sym_hashes (abfd), 0,
4478 extsymcount * sizeof (struct elf_link_hash_entry *));
4479 htab->root.table.table = old_table;
4480 htab->root.table.size = old_size;
4481 htab->root.table.count = old_count;
4482 memcpy (htab->root.table.table, old_tab, tabsize);
4483 htab->root.undefs = old_undefs;
4484 htab->root.undefs_tail = old_undefs_tail;
4485 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4486 for (i = 0; i < htab->root.table.size; i++)
4488 struct bfd_hash_entry *p;
4489 struct elf_link_hash_entry *h;
4491 unsigned int alignment_power;
4493 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4495 h = (struct elf_link_hash_entry *) p;
4496 if (h->root.type == bfd_link_hash_warning)
4497 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4498 if (h->dynindx >= old_dynsymcount
4499 && h->dynstr_index < old_dynstr_size)
4500 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4502 /* Preserve the maximum alignment and size for common
4503 symbols even if this dynamic lib isn't on DT_NEEDED
4504 since it can still be loaded at run time by another
4506 if (h->root.type == bfd_link_hash_common)
4508 size = h->root.u.c.size;
4509 alignment_power = h->root.u.c.p->alignment_power;
4514 alignment_power = 0;
4516 memcpy (p, old_ent, htab->root.table.entsize);
4517 old_ent = (char *) old_ent + htab->root.table.entsize;
4518 h = (struct elf_link_hash_entry *) p;
4519 if (h->root.type == bfd_link_hash_warning)
4521 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4522 old_ent = (char *) old_ent + htab->root.table.entsize;
4523 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4525 if (h->root.type == bfd_link_hash_common)
4527 if (size > h->root.u.c.size)
4528 h->root.u.c.size = size;
4529 if (alignment_power > h->root.u.c.p->alignment_power)
4530 h->root.u.c.p->alignment_power = alignment_power;
4535 /* Make a special call to the linker "notice" function to
4536 tell it that symbols added for crefs may need to be removed. */
4537 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4538 goto error_free_vers;
4541 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4543 if (nondeflt_vers != NULL)
4544 free (nondeflt_vers);
4548 if (old_tab != NULL)
4550 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4551 goto error_free_vers;
4556 /* Now that all the symbols from this input file are created, handle
4557 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4558 if (nondeflt_vers != NULL)
4560 bfd_size_type cnt, symidx;
4562 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4564 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4565 char *shortname, *p;
4567 p = strchr (h->root.root.string, ELF_VER_CHR);
4569 || (h->root.type != bfd_link_hash_defined
4570 && h->root.type != bfd_link_hash_defweak))
4573 amt = p - h->root.root.string;
4574 shortname = (char *) bfd_malloc (amt + 1);
4576 goto error_free_vers;
4577 memcpy (shortname, h->root.root.string, amt);
4578 shortname[amt] = '\0';
4580 hi = (struct elf_link_hash_entry *)
4581 bfd_link_hash_lookup (&htab->root, shortname,
4582 FALSE, FALSE, FALSE);
4584 && hi->root.type == h->root.type
4585 && hi->root.u.def.value == h->root.u.def.value
4586 && hi->root.u.def.section == h->root.u.def.section)
4588 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4589 hi->root.type = bfd_link_hash_indirect;
4590 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4591 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4592 sym_hash = elf_sym_hashes (abfd);
4594 for (symidx = 0; symidx < extsymcount; ++symidx)
4595 if (sym_hash[symidx] == hi)
4597 sym_hash[symidx] = h;
4603 free (nondeflt_vers);
4604 nondeflt_vers = NULL;
4607 /* Now set the weakdefs field correctly for all the weak defined
4608 symbols we found. The only way to do this is to search all the
4609 symbols. Since we only need the information for non functions in
4610 dynamic objects, that's the only time we actually put anything on
4611 the list WEAKS. We need this information so that if a regular
4612 object refers to a symbol defined weakly in a dynamic object, the
4613 real symbol in the dynamic object is also put in the dynamic
4614 symbols; we also must arrange for both symbols to point to the
4615 same memory location. We could handle the general case of symbol
4616 aliasing, but a general symbol alias can only be generated in
4617 assembler code, handling it correctly would be very time
4618 consuming, and other ELF linkers don't handle general aliasing
4622 struct elf_link_hash_entry **hpp;
4623 struct elf_link_hash_entry **hppend;
4624 struct elf_link_hash_entry **sorted_sym_hash;
4625 struct elf_link_hash_entry *h;
4628 /* Since we have to search the whole symbol list for each weak
4629 defined symbol, search time for N weak defined symbols will be
4630 O(N^2). Binary search will cut it down to O(NlogN). */
4631 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4632 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4633 if (sorted_sym_hash == NULL)
4635 sym_hash = sorted_sym_hash;
4636 hpp = elf_sym_hashes (abfd);
4637 hppend = hpp + extsymcount;
4639 for (; hpp < hppend; hpp++)
4643 && h->root.type == bfd_link_hash_defined
4644 && !bed->is_function_type (h->type))
4652 qsort (sorted_sym_hash, sym_count,
4653 sizeof (struct elf_link_hash_entry *),
4656 while (weaks != NULL)
4658 struct elf_link_hash_entry *hlook;
4661 size_t i, j, idx = 0;
4664 weaks = hlook->u.weakdef;
4665 hlook->u.weakdef = NULL;
4667 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4668 || hlook->root.type == bfd_link_hash_defweak
4669 || hlook->root.type == bfd_link_hash_common
4670 || hlook->root.type == bfd_link_hash_indirect);
4671 slook = hlook->root.u.def.section;
4672 vlook = hlook->root.u.def.value;
4678 bfd_signed_vma vdiff;
4680 h = sorted_sym_hash[idx];
4681 vdiff = vlook - h->root.u.def.value;
4688 long sdiff = slook->id - h->root.u.def.section->id;
4698 /* We didn't find a value/section match. */
4702 /* With multiple aliases, or when the weak symbol is already
4703 strongly defined, we have multiple matching symbols and
4704 the binary search above may land on any of them. Step
4705 one past the matching symbol(s). */
4708 h = sorted_sym_hash[idx];
4709 if (h->root.u.def.section != slook
4710 || h->root.u.def.value != vlook)
4714 /* Now look back over the aliases. Since we sorted by size
4715 as well as value and section, we'll choose the one with
4716 the largest size. */
4719 h = sorted_sym_hash[idx];
4721 /* Stop if value or section doesn't match. */
4722 if (h->root.u.def.section != slook
4723 || h->root.u.def.value != vlook)
4725 else if (h != hlook)
4727 hlook->u.weakdef = h;
4729 /* If the weak definition is in the list of dynamic
4730 symbols, make sure the real definition is put
4732 if (hlook->dynindx != -1 && h->dynindx == -1)
4734 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4737 free (sorted_sym_hash);
4742 /* If the real definition is in the list of dynamic
4743 symbols, make sure the weak definition is put
4744 there as well. If we don't do this, then the
4745 dynamic loader might not merge the entries for the
4746 real definition and the weak definition. */
4747 if (h->dynindx != -1 && hlook->dynindx == -1)
4749 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4750 goto err_free_sym_hash;
4757 free (sorted_sym_hash);
4760 if (bed->check_directives
4761 && !(*bed->check_directives) (abfd, info))
4764 /* If this object is the same format as the output object, and it is
4765 not a shared library, then let the backend look through the
4768 This is required to build global offset table entries and to
4769 arrange for dynamic relocs. It is not required for the
4770 particular common case of linking non PIC code, even when linking
4771 against shared libraries, but unfortunately there is no way of
4772 knowing whether an object file has been compiled PIC or not.
4773 Looking through the relocs is not particularly time consuming.
4774 The problem is that we must either (1) keep the relocs in memory,
4775 which causes the linker to require additional runtime memory or
4776 (2) read the relocs twice from the input file, which wastes time.
4777 This would be a good case for using mmap.
4779 I have no idea how to handle linking PIC code into a file of a
4780 different format. It probably can't be done. */
4782 && is_elf_hash_table (htab)
4783 && bed->check_relocs != NULL
4784 && elf_object_id (abfd) == elf_hash_table_id (htab)
4785 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4789 for (o = abfd->sections; o != NULL; o = o->next)
4791 Elf_Internal_Rela *internal_relocs;
4794 if ((o->flags & SEC_RELOC) == 0
4795 || o->reloc_count == 0
4796 || ((info->strip == strip_all || info->strip == strip_debugger)
4797 && (o->flags & SEC_DEBUGGING) != 0)
4798 || bfd_is_abs_section (o->output_section))
4801 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4803 if (internal_relocs == NULL)
4806 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4808 if (elf_section_data (o)->relocs != internal_relocs)
4809 free (internal_relocs);
4816 /* If this is a non-traditional link, try to optimize the handling
4817 of the .stab/.stabstr sections. */
4819 && ! info->traditional_format
4820 && is_elf_hash_table (htab)
4821 && (info->strip != strip_all && info->strip != strip_debugger))
4825 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4826 if (stabstr != NULL)
4828 bfd_size_type string_offset = 0;
4831 for (stab = abfd->sections; stab; stab = stab->next)
4832 if (CONST_STRNEQ (stab->name, ".stab")
4833 && (!stab->name[5] ||
4834 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4835 && (stab->flags & SEC_MERGE) == 0
4836 && !bfd_is_abs_section (stab->output_section))
4838 struct bfd_elf_section_data *secdata;
4840 secdata = elf_section_data (stab);
4841 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4842 stabstr, &secdata->sec_info,
4845 if (secdata->sec_info)
4846 stab->sec_info_type = SEC_INFO_TYPE_STABS;
4851 if (is_elf_hash_table (htab) && add_needed)
4853 /* Add this bfd to the loaded list. */
4854 struct elf_link_loaded_list *n;
4856 n = (struct elf_link_loaded_list *)
4857 bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4861 n->next = htab->loaded;
4868 if (old_tab != NULL)
4870 if (nondeflt_vers != NULL)
4871 free (nondeflt_vers);
4872 if (extversym != NULL)
4875 if (isymbuf != NULL)
4881 /* Return the linker hash table entry of a symbol that might be
4882 satisfied by an archive symbol. Return -1 on error. */
4884 struct elf_link_hash_entry *
4885 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4886 struct bfd_link_info *info,
4889 struct elf_link_hash_entry *h;
4893 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
4897 /* If this is a default version (the name contains @@), look up the
4898 symbol again with only one `@' as well as without the version.
4899 The effect is that references to the symbol with and without the
4900 version will be matched by the default symbol in the archive. */
4902 p = strchr (name, ELF_VER_CHR);
4903 if (p == NULL || p[1] != ELF_VER_CHR)
4906 /* First check with only one `@'. */
4907 len = strlen (name);
4908 copy = (char *) bfd_alloc (abfd, len);
4910 return (struct elf_link_hash_entry *) 0 - 1;
4912 first = p - name + 1;
4913 memcpy (copy, name, first);
4914 memcpy (copy + first, name + first + 1, len - first);
4916 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
4919 /* We also need to check references to the symbol without the
4921 copy[first - 1] = '\0';
4922 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4923 FALSE, FALSE, TRUE);
4926 bfd_release (abfd, copy);
4930 /* Add symbols from an ELF archive file to the linker hash table. We
4931 don't use _bfd_generic_link_add_archive_symbols because of a
4932 problem which arises on UnixWare. The UnixWare libc.so is an
4933 archive which includes an entry libc.so.1 which defines a bunch of
4934 symbols. The libc.so archive also includes a number of other
4935 object files, which also define symbols, some of which are the same
4936 as those defined in libc.so.1. Correct linking requires that we
4937 consider each object file in turn, and include it if it defines any
4938 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4939 this; it looks through the list of undefined symbols, and includes
4940 any object file which defines them. When this algorithm is used on
4941 UnixWare, it winds up pulling in libc.so.1 early and defining a
4942 bunch of symbols. This means that some of the other objects in the
4943 archive are not included in the link, which is incorrect since they
4944 precede libc.so.1 in the archive.
4946 Fortunately, ELF archive handling is simpler than that done by
4947 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4948 oddities. In ELF, if we find a symbol in the archive map, and the
4949 symbol is currently undefined, we know that we must pull in that
4952 Unfortunately, we do have to make multiple passes over the symbol
4953 table until nothing further is resolved. */
4956 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4959 bfd_boolean *defined = NULL;
4960 bfd_boolean *included = NULL;
4964 const struct elf_backend_data *bed;
4965 struct elf_link_hash_entry * (*archive_symbol_lookup)
4966 (bfd *, struct bfd_link_info *, const char *);
4968 if (! bfd_has_map (abfd))
4970 /* An empty archive is a special case. */
4971 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4973 bfd_set_error (bfd_error_no_armap);
4977 /* Keep track of all symbols we know to be already defined, and all
4978 files we know to be already included. This is to speed up the
4979 second and subsequent passes. */
4980 c = bfd_ardata (abfd)->symdef_count;
4984 amt *= sizeof (bfd_boolean);
4985 defined = (bfd_boolean *) bfd_zmalloc (amt);
4986 included = (bfd_boolean *) bfd_zmalloc (amt);
4987 if (defined == NULL || included == NULL)
4990 symdefs = bfd_ardata (abfd)->symdefs;
4991 bed = get_elf_backend_data (abfd);
4992 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5005 symdefend = symdef + c;
5006 for (i = 0; symdef < symdefend; symdef++, i++)
5008 struct elf_link_hash_entry *h;
5010 struct bfd_link_hash_entry *undefs_tail;
5013 if (defined[i] || included[i])
5015 if (symdef->file_offset == last)
5021 h = archive_symbol_lookup (abfd, info, symdef->name);
5022 if (h == (struct elf_link_hash_entry *) 0 - 1)
5028 if (h->root.type == bfd_link_hash_common)
5030 /* We currently have a common symbol. The archive map contains
5031 a reference to this symbol, so we may want to include it. We
5032 only want to include it however, if this archive element
5033 contains a definition of the symbol, not just another common
5036 Unfortunately some archivers (including GNU ar) will put
5037 declarations of common symbols into their archive maps, as
5038 well as real definitions, so we cannot just go by the archive
5039 map alone. Instead we must read in the element's symbol
5040 table and check that to see what kind of symbol definition
5042 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5045 else if (h->root.type != bfd_link_hash_undefined)
5047 if (h->root.type != bfd_link_hash_undefweak)
5052 /* We need to include this archive member. */
5053 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5054 if (element == NULL)
5057 if (! bfd_check_format (element, bfd_object))
5060 /* Doublecheck that we have not included this object
5061 already--it should be impossible, but there may be
5062 something wrong with the archive. */
5063 if (element->archive_pass != 0)
5065 bfd_set_error (bfd_error_bad_value);
5068 element->archive_pass = 1;
5070 undefs_tail = info->hash->undefs_tail;
5072 if (!(*info->callbacks
5073 ->add_archive_element) (info, element, symdef->name, &element))
5075 if (!bfd_link_add_symbols (element, info))
5078 /* If there are any new undefined symbols, we need to make
5079 another pass through the archive in order to see whether
5080 they can be defined. FIXME: This isn't perfect, because
5081 common symbols wind up on undefs_tail and because an
5082 undefined symbol which is defined later on in this pass
5083 does not require another pass. This isn't a bug, but it
5084 does make the code less efficient than it could be. */
5085 if (undefs_tail != info->hash->undefs_tail)
5088 /* Look backward to mark all symbols from this object file
5089 which we have already seen in this pass. */
5093 included[mark] = TRUE;
5098 while (symdefs[mark].file_offset == symdef->file_offset);
5100 /* We mark subsequent symbols from this object file as we go
5101 on through the loop. */
5102 last = symdef->file_offset;
5113 if (defined != NULL)
5115 if (included != NULL)
5120 /* Given an ELF BFD, add symbols to the global hash table as
5124 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5126 switch (bfd_get_format (abfd))
5129 return elf_link_add_object_symbols (abfd, info);
5131 return elf_link_add_archive_symbols (abfd, info);
5133 bfd_set_error (bfd_error_wrong_format);
5138 struct hash_codes_info
5140 unsigned long *hashcodes;
5144 /* This function will be called though elf_link_hash_traverse to store
5145 all hash value of the exported symbols in an array. */
5148 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5150 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5156 /* Ignore indirect symbols. These are added by the versioning code. */
5157 if (h->dynindx == -1)
5160 name = h->root.root.string;
5161 p = strchr (name, ELF_VER_CHR);
5164 alc = (char *) bfd_malloc (p - name + 1);
5170 memcpy (alc, name, p - name);
5171 alc[p - name] = '\0';
5175 /* Compute the hash value. */
5176 ha = bfd_elf_hash (name);
5178 /* Store the found hash value in the array given as the argument. */
5179 *(inf->hashcodes)++ = ha;
5181 /* And store it in the struct so that we can put it in the hash table
5183 h->u.elf_hash_value = ha;
5191 struct collect_gnu_hash_codes
5194 const struct elf_backend_data *bed;
5195 unsigned long int nsyms;
5196 unsigned long int maskbits;
5197 unsigned long int *hashcodes;
5198 unsigned long int *hashval;
5199 unsigned long int *indx;
5200 unsigned long int *counts;
5203 long int min_dynindx;
5204 unsigned long int bucketcount;
5205 unsigned long int symindx;
5206 long int local_indx;
5207 long int shift1, shift2;
5208 unsigned long int mask;
5212 /* This function will be called though elf_link_hash_traverse to store
5213 all hash value of the exported symbols in an array. */
5216 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5218 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5224 /* Ignore indirect symbols. These are added by the versioning code. */
5225 if (h->dynindx == -1)
5228 /* Ignore also local symbols and undefined symbols. */
5229 if (! (*s->bed->elf_hash_symbol) (h))
5232 name = h->root.root.string;
5233 p = strchr (name, ELF_VER_CHR);
5236 alc = (char *) bfd_malloc (p - name + 1);
5242 memcpy (alc, name, p - name);
5243 alc[p - name] = '\0';
5247 /* Compute the hash value. */
5248 ha = bfd_elf_gnu_hash (name);
5250 /* Store the found hash value in the array for compute_bucket_count,
5251 and also for .dynsym reordering purposes. */
5252 s->hashcodes[s->nsyms] = ha;
5253 s->hashval[h->dynindx] = ha;
5255 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5256 s->min_dynindx = h->dynindx;
5264 /* This function will be called though elf_link_hash_traverse to do
5265 final dynaminc symbol renumbering. */
5268 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5270 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5271 unsigned long int bucket;
5272 unsigned long int val;
5274 /* Ignore indirect symbols. */
5275 if (h->dynindx == -1)
5278 /* Ignore also local symbols and undefined symbols. */
5279 if (! (*s->bed->elf_hash_symbol) (h))
5281 if (h->dynindx >= s->min_dynindx)
5282 h->dynindx = s->local_indx++;
5286 bucket = s->hashval[h->dynindx] % s->bucketcount;
5287 val = (s->hashval[h->dynindx] >> s->shift1)
5288 & ((s->maskbits >> s->shift1) - 1);
5289 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5291 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5292 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5293 if (s->counts[bucket] == 1)
5294 /* Last element terminates the chain. */
5296 bfd_put_32 (s->output_bfd, val,
5297 s->contents + (s->indx[bucket] - s->symindx) * 4);
5298 --s->counts[bucket];
5299 h->dynindx = s->indx[bucket]++;
5303 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5306 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5308 return !(h->forced_local
5309 || h->root.type == bfd_link_hash_undefined
5310 || h->root.type == bfd_link_hash_undefweak
5311 || ((h->root.type == bfd_link_hash_defined
5312 || h->root.type == bfd_link_hash_defweak)
5313 && h->root.u.def.section->output_section == NULL));
5316 /* Array used to determine the number of hash table buckets to use
5317 based on the number of symbols there are. If there are fewer than
5318 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5319 fewer than 37 we use 17 buckets, and so forth. We never use more
5320 than 32771 buckets. */
5322 static const size_t elf_buckets[] =
5324 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5328 /* Compute bucket count for hashing table. We do not use a static set
5329 of possible tables sizes anymore. Instead we determine for all
5330 possible reasonable sizes of the table the outcome (i.e., the
5331 number of collisions etc) and choose the best solution. The
5332 weighting functions are not too simple to allow the table to grow
5333 without bounds. Instead one of the weighting factors is the size.
5334 Therefore the result is always a good payoff between few collisions
5335 (= short chain lengths) and table size. */
5337 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5338 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5339 unsigned long int nsyms,
5342 size_t best_size = 0;
5343 unsigned long int i;
5345 /* We have a problem here. The following code to optimize the table
5346 size requires an integer type with more the 32 bits. If
5347 BFD_HOST_U_64_BIT is set we know about such a type. */
5348 #ifdef BFD_HOST_U_64_BIT
5353 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5354 bfd *dynobj = elf_hash_table (info)->dynobj;
5355 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5356 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5357 unsigned long int *counts;
5359 unsigned int no_improvement_count = 0;
5361 /* Possible optimization parameters: if we have NSYMS symbols we say
5362 that the hashing table must at least have NSYMS/4 and at most
5364 minsize = nsyms / 4;
5367 best_size = maxsize = nsyms * 2;
5372 if ((best_size & 31) == 0)
5376 /* Create array where we count the collisions in. We must use bfd_malloc
5377 since the size could be large. */
5379 amt *= sizeof (unsigned long int);
5380 counts = (unsigned long int *) bfd_malloc (amt);
5384 /* Compute the "optimal" size for the hash table. The criteria is a
5385 minimal chain length. The minor criteria is (of course) the size
5387 for (i = minsize; i < maxsize; ++i)
5389 /* Walk through the array of hashcodes and count the collisions. */
5390 BFD_HOST_U_64_BIT max;
5391 unsigned long int j;
5392 unsigned long int fact;
5394 if (gnu_hash && (i & 31) == 0)
5397 memset (counts, '\0', i * sizeof (unsigned long int));
5399 /* Determine how often each hash bucket is used. */
5400 for (j = 0; j < nsyms; ++j)
5401 ++counts[hashcodes[j] % i];
5403 /* For the weight function we need some information about the
5404 pagesize on the target. This is information need not be 100%
5405 accurate. Since this information is not available (so far) we
5406 define it here to a reasonable default value. If it is crucial
5407 to have a better value some day simply define this value. */
5408 # ifndef BFD_TARGET_PAGESIZE
5409 # define BFD_TARGET_PAGESIZE (4096)
5412 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5414 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5417 /* Variant 1: optimize for short chains. We add the squares
5418 of all the chain lengths (which favors many small chain
5419 over a few long chains). */
5420 for (j = 0; j < i; ++j)
5421 max += counts[j] * counts[j];
5423 /* This adds penalties for the overall size of the table. */
5424 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5427 /* Variant 2: Optimize a lot more for small table. Here we
5428 also add squares of the size but we also add penalties for
5429 empty slots (the +1 term). */
5430 for (j = 0; j < i; ++j)
5431 max += (1 + counts[j]) * (1 + counts[j]);
5433 /* The overall size of the table is considered, but not as
5434 strong as in variant 1, where it is squared. */
5435 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5439 /* Compare with current best results. */
5440 if (max < best_chlen)
5444 no_improvement_count = 0;
5446 /* PR 11843: Avoid futile long searches for the best bucket size
5447 when there are a large number of symbols. */
5448 else if (++no_improvement_count == 100)
5455 #endif /* defined (BFD_HOST_U_64_BIT) */
5457 /* This is the fallback solution if no 64bit type is available or if we
5458 are not supposed to spend much time on optimizations. We select the
5459 bucket count using a fixed set of numbers. */
5460 for (i = 0; elf_buckets[i] != 0; i++)
5462 best_size = elf_buckets[i];
5463 if (nsyms < elf_buckets[i + 1])
5466 if (gnu_hash && best_size < 2)
5473 /* Size any SHT_GROUP section for ld -r. */
5476 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5480 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5481 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5482 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5487 /* Set a default stack segment size. The value in INFO wins. If it
5488 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5489 undefined it is initialized. */
5492 bfd_elf_stack_segment_size (bfd *output_bfd,
5493 struct bfd_link_info *info,
5494 const char *legacy_symbol,
5495 bfd_vma default_size)
5497 struct elf_link_hash_entry *h = NULL;
5499 /* Look for legacy symbol. */
5501 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5502 FALSE, FALSE, FALSE);
5503 if (h && (h->root.type == bfd_link_hash_defined
5504 || h->root.type == bfd_link_hash_defweak)
5506 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5508 /* The symbol has no type if specified on the command line. */
5509 h->type = STT_OBJECT;
5510 if (info->stacksize)
5511 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5512 output_bfd, legacy_symbol);
5513 else if (h->root.u.def.section != bfd_abs_section_ptr)
5514 (*_bfd_error_handler) (_("%B: %s not absolute"),
5515 output_bfd, legacy_symbol);
5517 info->stacksize = h->root.u.def.value;
5520 if (!info->stacksize)
5521 /* If the user didn't set a size, or explicitly inhibit the
5522 size, set it now. */
5523 info->stacksize = default_size;
5525 /* Provide the legacy symbol, if it is referenced. */
5526 if (h && (h->root.type == bfd_link_hash_undefined
5527 || h->root.type == bfd_link_hash_undefweak))
5529 struct bfd_link_hash_entry *bh = NULL;
5531 if (!(_bfd_generic_link_add_one_symbol
5532 (info, output_bfd, legacy_symbol,
5533 BSF_GLOBAL, bfd_abs_section_ptr,
5534 info->stacksize >= 0 ? info->stacksize : 0,
5535 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5538 h = (struct elf_link_hash_entry *) bh;
5540 h->type = STT_OBJECT;
5546 /* Set up the sizes and contents of the ELF dynamic sections. This is
5547 called by the ELF linker emulation before_allocation routine. We
5548 must set the sizes of the sections before the linker sets the
5549 addresses of the various sections. */
5552 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5555 const char *filter_shlib,
5557 const char *depaudit,
5558 const char * const *auxiliary_filters,
5559 struct bfd_link_info *info,
5560 asection **sinterpptr)
5562 bfd_size_type soname_indx;
5564 const struct elf_backend_data *bed;
5565 struct elf_info_failed asvinfo;
5569 soname_indx = (bfd_size_type) -1;
5571 if (!is_elf_hash_table (info->hash))
5574 bed = get_elf_backend_data (output_bfd);
5576 /* Any syms created from now on start with -1 in
5577 got.refcount/offset and plt.refcount/offset. */
5578 elf_hash_table (info)->init_got_refcount
5579 = elf_hash_table (info)->init_got_offset;
5580 elf_hash_table (info)->init_plt_refcount
5581 = elf_hash_table (info)->init_plt_offset;
5583 if (info->relocatable
5584 && !_bfd_elf_size_group_sections (info))
5587 /* The backend may have to create some sections regardless of whether
5588 we're dynamic or not. */
5589 if (bed->elf_backend_always_size_sections
5590 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5593 /* Determine any GNU_STACK segment requirements, after the backend
5594 has had a chance to set a default segment size. */
5595 if (info->execstack)
5596 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5597 else if (info->noexecstack)
5598 elf_stack_flags (output_bfd) = PF_R | PF_W;
5602 asection *notesec = NULL;
5605 for (inputobj = info->input_bfds;
5607 inputobj = inputobj->link.next)
5612 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5614 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5617 if (s->flags & SEC_CODE)
5621 else if (bed->default_execstack)
5624 if (notesec || info->stacksize > 0)
5625 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5626 if (notesec && exec && info->relocatable
5627 && notesec->output_section != bfd_abs_section_ptr)
5628 notesec->output_section->flags |= SEC_CODE;
5631 dynobj = elf_hash_table (info)->dynobj;
5633 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5635 struct elf_info_failed eif;
5636 struct elf_link_hash_entry *h;
5638 struct bfd_elf_version_tree *t;
5639 struct bfd_elf_version_expr *d;
5641 bfd_boolean all_defined;
5643 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5644 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5648 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5650 if (soname_indx == (bfd_size_type) -1
5651 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5657 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5659 info->flags |= DF_SYMBOLIC;
5667 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5669 if (indx == (bfd_size_type) -1)
5672 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5673 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5677 if (filter_shlib != NULL)
5681 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5682 filter_shlib, TRUE);
5683 if (indx == (bfd_size_type) -1
5684 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5688 if (auxiliary_filters != NULL)
5690 const char * const *p;
5692 for (p = auxiliary_filters; *p != NULL; p++)
5696 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5698 if (indx == (bfd_size_type) -1
5699 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5708 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5710 if (indx == (bfd_size_type) -1
5711 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5715 if (depaudit != NULL)
5719 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5721 if (indx == (bfd_size_type) -1
5722 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5729 /* If we are supposed to export all symbols into the dynamic symbol
5730 table (this is not the normal case), then do so. */
5731 if (info->export_dynamic
5732 || (info->executable && info->dynamic))
5734 elf_link_hash_traverse (elf_hash_table (info),
5735 _bfd_elf_export_symbol,
5741 /* Make all global versions with definition. */
5742 for (t = info->version_info; t != NULL; t = t->next)
5743 for (d = t->globals.list; d != NULL; d = d->next)
5744 if (!d->symver && d->literal)
5746 const char *verstr, *name;
5747 size_t namelen, verlen, newlen;
5748 char *newname, *p, leading_char;
5749 struct elf_link_hash_entry *newh;
5751 leading_char = bfd_get_symbol_leading_char (output_bfd);
5753 namelen = strlen (name) + (leading_char != '\0');
5755 verlen = strlen (verstr);
5756 newlen = namelen + verlen + 3;
5758 newname = (char *) bfd_malloc (newlen);
5759 if (newname == NULL)
5761 newname[0] = leading_char;
5762 memcpy (newname + (leading_char != '\0'), name, namelen);
5764 /* Check the hidden versioned definition. */
5765 p = newname + namelen;
5767 memcpy (p, verstr, verlen + 1);
5768 newh = elf_link_hash_lookup (elf_hash_table (info),
5769 newname, FALSE, FALSE,
5772 || (newh->root.type != bfd_link_hash_defined
5773 && newh->root.type != bfd_link_hash_defweak))
5775 /* Check the default versioned definition. */
5777 memcpy (p, verstr, verlen + 1);
5778 newh = elf_link_hash_lookup (elf_hash_table (info),
5779 newname, FALSE, FALSE,
5784 /* Mark this version if there is a definition and it is
5785 not defined in a shared object. */
5787 && !newh->def_dynamic
5788 && (newh->root.type == bfd_link_hash_defined
5789 || newh->root.type == bfd_link_hash_defweak))
5793 /* Attach all the symbols to their version information. */
5794 asvinfo.info = info;
5795 asvinfo.failed = FALSE;
5797 elf_link_hash_traverse (elf_hash_table (info),
5798 _bfd_elf_link_assign_sym_version,
5803 if (!info->allow_undefined_version)
5805 /* Check if all global versions have a definition. */
5807 for (t = info->version_info; t != NULL; t = t->next)
5808 for (d = t->globals.list; d != NULL; d = d->next)
5809 if (d->literal && !d->symver && !d->script)
5811 (*_bfd_error_handler)
5812 (_("%s: undefined version: %s"),
5813 d->pattern, t->name);
5814 all_defined = FALSE;
5819 bfd_set_error (bfd_error_bad_value);
5824 /* Find all symbols which were defined in a dynamic object and make
5825 the backend pick a reasonable value for them. */
5826 elf_link_hash_traverse (elf_hash_table (info),
5827 _bfd_elf_adjust_dynamic_symbol,
5832 /* Add some entries to the .dynamic section. We fill in some of the
5833 values later, in bfd_elf_final_link, but we must add the entries
5834 now so that we know the final size of the .dynamic section. */
5836 /* If there are initialization and/or finalization functions to
5837 call then add the corresponding DT_INIT/DT_FINI entries. */
5838 h = (info->init_function
5839 ? elf_link_hash_lookup (elf_hash_table (info),
5840 info->init_function, FALSE,
5847 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5850 h = (info->fini_function
5851 ? elf_link_hash_lookup (elf_hash_table (info),
5852 info->fini_function, FALSE,
5859 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5863 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5864 if (s != NULL && s->linker_has_input)
5866 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5867 if (! info->executable)
5872 for (sub = info->input_bfds; sub != NULL;
5873 sub = sub->link.next)
5874 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5875 for (o = sub->sections; o != NULL; o = o->next)
5876 if (elf_section_data (o)->this_hdr.sh_type
5877 == SHT_PREINIT_ARRAY)
5879 (*_bfd_error_handler)
5880 (_("%B: .preinit_array section is not allowed in DSO"),
5885 bfd_set_error (bfd_error_nonrepresentable_section);
5889 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5890 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5893 s = bfd_get_section_by_name (output_bfd, ".init_array");
5894 if (s != NULL && s->linker_has_input)
5896 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5897 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5900 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5901 if (s != NULL && s->linker_has_input)
5903 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5904 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5908 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
5909 /* If .dynstr is excluded from the link, we don't want any of
5910 these tags. Strictly, we should be checking each section
5911 individually; This quick check covers for the case where
5912 someone does a /DISCARD/ : { *(*) }. */
5913 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5915 bfd_size_type strsize;
5917 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5918 if ((info->emit_hash
5919 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5920 || (info->emit_gnu_hash
5921 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5922 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5923 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5924 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5925 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5926 bed->s->sizeof_sym))
5931 /* The backend must work out the sizes of all the other dynamic
5934 && bed->elf_backend_size_dynamic_sections != NULL
5935 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5938 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5941 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5943 unsigned long section_sym_count;
5944 struct bfd_elf_version_tree *verdefs;
5947 /* Set up the version definition section. */
5948 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
5949 BFD_ASSERT (s != NULL);
5951 /* We may have created additional version definitions if we are
5952 just linking a regular application. */
5953 verdefs = info->version_info;
5955 /* Skip anonymous version tag. */
5956 if (verdefs != NULL && verdefs->vernum == 0)
5957 verdefs = verdefs->next;
5959 if (verdefs == NULL && !info->create_default_symver)
5960 s->flags |= SEC_EXCLUDE;
5965 struct bfd_elf_version_tree *t;
5967 Elf_Internal_Verdef def;
5968 Elf_Internal_Verdaux defaux;
5969 struct bfd_link_hash_entry *bh;
5970 struct elf_link_hash_entry *h;
5976 /* Make space for the base version. */
5977 size += sizeof (Elf_External_Verdef);
5978 size += sizeof (Elf_External_Verdaux);
5981 /* Make space for the default version. */
5982 if (info->create_default_symver)
5984 size += sizeof (Elf_External_Verdef);
5988 for (t = verdefs; t != NULL; t = t->next)
5990 struct bfd_elf_version_deps *n;
5992 /* Don't emit base version twice. */
5996 size += sizeof (Elf_External_Verdef);
5997 size += sizeof (Elf_External_Verdaux);
6000 for (n = t->deps; n != NULL; n = n->next)
6001 size += sizeof (Elf_External_Verdaux);
6005 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6006 if (s->contents == NULL && s->size != 0)
6009 /* Fill in the version definition section. */
6013 def.vd_version = VER_DEF_CURRENT;
6014 def.vd_flags = VER_FLG_BASE;
6017 if (info->create_default_symver)
6019 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
6020 def.vd_next = sizeof (Elf_External_Verdef);
6024 def.vd_aux = sizeof (Elf_External_Verdef);
6025 def.vd_next = (sizeof (Elf_External_Verdef)
6026 + sizeof (Elf_External_Verdaux));
6029 if (soname_indx != (bfd_size_type) -1)
6031 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6033 def.vd_hash = bfd_elf_hash (soname);
6034 defaux.vda_name = soname_indx;
6041 name = lbasename (output_bfd->filename);
6042 def.vd_hash = bfd_elf_hash (name);
6043 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6045 if (indx == (bfd_size_type) -1)
6047 defaux.vda_name = indx;
6049 defaux.vda_next = 0;
6051 _bfd_elf_swap_verdef_out (output_bfd, &def,
6052 (Elf_External_Verdef *) p);
6053 p += sizeof (Elf_External_Verdef);
6054 if (info->create_default_symver)
6056 /* Add a symbol representing this version. */
6058 if (! (_bfd_generic_link_add_one_symbol
6059 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6061 get_elf_backend_data (dynobj)->collect, &bh)))
6063 h = (struct elf_link_hash_entry *) bh;
6066 h->type = STT_OBJECT;
6067 h->verinfo.vertree = NULL;
6069 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6072 /* Create a duplicate of the base version with the same
6073 aux block, but different flags. */
6076 def.vd_aux = sizeof (Elf_External_Verdef);
6078 def.vd_next = (sizeof (Elf_External_Verdef)
6079 + sizeof (Elf_External_Verdaux));
6082 _bfd_elf_swap_verdef_out (output_bfd, &def,
6083 (Elf_External_Verdef *) p);
6084 p += sizeof (Elf_External_Verdef);
6086 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6087 (Elf_External_Verdaux *) p);
6088 p += sizeof (Elf_External_Verdaux);
6090 for (t = verdefs; t != NULL; t = t->next)
6093 struct bfd_elf_version_deps *n;
6095 /* Don't emit the base version twice. */
6100 for (n = t->deps; n != NULL; n = n->next)
6103 /* Add a symbol representing this version. */
6105 if (! (_bfd_generic_link_add_one_symbol
6106 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6108 get_elf_backend_data (dynobj)->collect, &bh)))
6110 h = (struct elf_link_hash_entry *) bh;
6113 h->type = STT_OBJECT;
6114 h->verinfo.vertree = t;
6116 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6119 def.vd_version = VER_DEF_CURRENT;
6121 if (t->globals.list == NULL
6122 && t->locals.list == NULL
6124 def.vd_flags |= VER_FLG_WEAK;
6125 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6126 def.vd_cnt = cdeps + 1;
6127 def.vd_hash = bfd_elf_hash (t->name);
6128 def.vd_aux = sizeof (Elf_External_Verdef);
6131 /* If a basever node is next, it *must* be the last node in
6132 the chain, otherwise Verdef construction breaks. */
6133 if (t->next != NULL && t->next->vernum == 0)
6134 BFD_ASSERT (t->next->next == NULL);
6136 if (t->next != NULL && t->next->vernum != 0)
6137 def.vd_next = (sizeof (Elf_External_Verdef)
6138 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6140 _bfd_elf_swap_verdef_out (output_bfd, &def,
6141 (Elf_External_Verdef *) p);
6142 p += sizeof (Elf_External_Verdef);
6144 defaux.vda_name = h->dynstr_index;
6145 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6147 defaux.vda_next = 0;
6148 if (t->deps != NULL)
6149 defaux.vda_next = sizeof (Elf_External_Verdaux);
6150 t->name_indx = defaux.vda_name;
6152 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6153 (Elf_External_Verdaux *) p);
6154 p += sizeof (Elf_External_Verdaux);
6156 for (n = t->deps; n != NULL; n = n->next)
6158 if (n->version_needed == NULL)
6160 /* This can happen if there was an error in the
6162 defaux.vda_name = 0;
6166 defaux.vda_name = n->version_needed->name_indx;
6167 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6170 if (n->next == NULL)
6171 defaux.vda_next = 0;
6173 defaux.vda_next = sizeof (Elf_External_Verdaux);
6175 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6176 (Elf_External_Verdaux *) p);
6177 p += sizeof (Elf_External_Verdaux);
6181 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6182 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6185 elf_tdata (output_bfd)->cverdefs = cdefs;
6188 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6190 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6193 else if (info->flags & DF_BIND_NOW)
6195 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6201 if (info->executable)
6202 info->flags_1 &= ~ (DF_1_INITFIRST
6205 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6209 /* Work out the size of the version reference section. */
6211 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6212 BFD_ASSERT (s != NULL);
6214 struct elf_find_verdep_info sinfo;
6217 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6218 if (sinfo.vers == 0)
6220 sinfo.failed = FALSE;
6222 elf_link_hash_traverse (elf_hash_table (info),
6223 _bfd_elf_link_find_version_dependencies,
6228 if (elf_tdata (output_bfd)->verref == NULL)
6229 s->flags |= SEC_EXCLUDE;
6232 Elf_Internal_Verneed *t;
6237 /* Build the version dependency section. */
6240 for (t = elf_tdata (output_bfd)->verref;
6244 Elf_Internal_Vernaux *a;
6246 size += sizeof (Elf_External_Verneed);
6248 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6249 size += sizeof (Elf_External_Vernaux);
6253 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6254 if (s->contents == NULL)
6258 for (t = elf_tdata (output_bfd)->verref;
6263 Elf_Internal_Vernaux *a;
6267 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6270 t->vn_version = VER_NEED_CURRENT;
6272 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6273 elf_dt_name (t->vn_bfd) != NULL
6274 ? elf_dt_name (t->vn_bfd)
6275 : lbasename (t->vn_bfd->filename),
6277 if (indx == (bfd_size_type) -1)
6280 t->vn_aux = sizeof (Elf_External_Verneed);
6281 if (t->vn_nextref == NULL)
6284 t->vn_next = (sizeof (Elf_External_Verneed)
6285 + caux * sizeof (Elf_External_Vernaux));
6287 _bfd_elf_swap_verneed_out (output_bfd, t,
6288 (Elf_External_Verneed *) p);
6289 p += sizeof (Elf_External_Verneed);
6291 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6293 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6294 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6295 a->vna_nodename, FALSE);
6296 if (indx == (bfd_size_type) -1)
6299 if (a->vna_nextptr == NULL)
6302 a->vna_next = sizeof (Elf_External_Vernaux);
6304 _bfd_elf_swap_vernaux_out (output_bfd, a,
6305 (Elf_External_Vernaux *) p);
6306 p += sizeof (Elf_External_Vernaux);
6310 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6311 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6314 elf_tdata (output_bfd)->cverrefs = crefs;
6318 if ((elf_tdata (output_bfd)->cverrefs == 0
6319 && elf_tdata (output_bfd)->cverdefs == 0)
6320 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6321 §ion_sym_count) == 0)
6323 s = bfd_get_linker_section (dynobj, ".gnu.version");
6324 s->flags |= SEC_EXCLUDE;
6330 /* Find the first non-excluded output section. We'll use its
6331 section symbol for some emitted relocs. */
6333 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6337 for (s = output_bfd->sections; s != NULL; s = s->next)
6338 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6339 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6341 elf_hash_table (info)->text_index_section = s;
6346 /* Find two non-excluded output sections, one for code, one for data.
6347 We'll use their section symbols for some emitted relocs. */
6349 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6353 /* Data first, since setting text_index_section changes
6354 _bfd_elf_link_omit_section_dynsym. */
6355 for (s = output_bfd->sections; s != NULL; s = s->next)
6356 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6357 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6359 elf_hash_table (info)->data_index_section = s;
6363 for (s = output_bfd->sections; s != NULL; s = s->next)
6364 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6365 == (SEC_ALLOC | SEC_READONLY))
6366 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6368 elf_hash_table (info)->text_index_section = s;
6372 if (elf_hash_table (info)->text_index_section == NULL)
6373 elf_hash_table (info)->text_index_section
6374 = elf_hash_table (info)->data_index_section;
6378 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6380 const struct elf_backend_data *bed;
6382 if (!is_elf_hash_table (info->hash))
6385 bed = get_elf_backend_data (output_bfd);
6386 (*bed->elf_backend_init_index_section) (output_bfd, info);
6388 if (elf_hash_table (info)->dynamic_sections_created)
6392 bfd_size_type dynsymcount;
6393 unsigned long section_sym_count;
6394 unsigned int dtagcount;
6396 dynobj = elf_hash_table (info)->dynobj;
6398 /* Assign dynsym indicies. In a shared library we generate a
6399 section symbol for each output section, which come first.
6400 Next come all of the back-end allocated local dynamic syms,
6401 followed by the rest of the global symbols. */
6403 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6404 §ion_sym_count);
6406 /* Work out the size of the symbol version section. */
6407 s = bfd_get_linker_section (dynobj, ".gnu.version");
6408 BFD_ASSERT (s != NULL);
6409 if (dynsymcount != 0
6410 && (s->flags & SEC_EXCLUDE) == 0)
6412 s->size = dynsymcount * sizeof (Elf_External_Versym);
6413 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6414 if (s->contents == NULL)
6417 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6421 /* Set the size of the .dynsym and .hash sections. We counted
6422 the number of dynamic symbols in elf_link_add_object_symbols.
6423 We will build the contents of .dynsym and .hash when we build
6424 the final symbol table, because until then we do not know the
6425 correct value to give the symbols. We built the .dynstr
6426 section as we went along in elf_link_add_object_symbols. */
6427 s = bfd_get_linker_section (dynobj, ".dynsym");
6428 BFD_ASSERT (s != NULL);
6429 s->size = dynsymcount * bed->s->sizeof_sym;
6431 if (dynsymcount != 0)
6433 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6434 if (s->contents == NULL)
6437 /* The first entry in .dynsym is a dummy symbol.
6438 Clear all the section syms, in case we don't output them all. */
6439 ++section_sym_count;
6440 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6443 elf_hash_table (info)->bucketcount = 0;
6445 /* Compute the size of the hashing table. As a side effect this
6446 computes the hash values for all the names we export. */
6447 if (info->emit_hash)
6449 unsigned long int *hashcodes;
6450 struct hash_codes_info hashinf;
6452 unsigned long int nsyms;
6454 size_t hash_entry_size;
6456 /* Compute the hash values for all exported symbols. At the same
6457 time store the values in an array so that we could use them for
6459 amt = dynsymcount * sizeof (unsigned long int);
6460 hashcodes = (unsigned long int *) bfd_malloc (amt);
6461 if (hashcodes == NULL)
6463 hashinf.hashcodes = hashcodes;
6464 hashinf.error = FALSE;
6466 /* Put all hash values in HASHCODES. */
6467 elf_link_hash_traverse (elf_hash_table (info),
6468 elf_collect_hash_codes, &hashinf);
6475 nsyms = hashinf.hashcodes - hashcodes;
6477 = compute_bucket_count (info, hashcodes, nsyms, 0);
6480 if (bucketcount == 0)
6483 elf_hash_table (info)->bucketcount = bucketcount;
6485 s = bfd_get_linker_section (dynobj, ".hash");
6486 BFD_ASSERT (s != NULL);
6487 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6488 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6489 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6490 if (s->contents == NULL)
6493 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6494 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6495 s->contents + hash_entry_size);
6498 if (info->emit_gnu_hash)
6501 unsigned char *contents;
6502 struct collect_gnu_hash_codes cinfo;
6506 memset (&cinfo, 0, sizeof (cinfo));
6508 /* Compute the hash values for all exported symbols. At the same
6509 time store the values in an array so that we could use them for
6511 amt = dynsymcount * 2 * sizeof (unsigned long int);
6512 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6513 if (cinfo.hashcodes == NULL)
6516 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6517 cinfo.min_dynindx = -1;
6518 cinfo.output_bfd = output_bfd;
6521 /* Put all hash values in HASHCODES. */
6522 elf_link_hash_traverse (elf_hash_table (info),
6523 elf_collect_gnu_hash_codes, &cinfo);
6526 free (cinfo.hashcodes);
6531 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6533 if (bucketcount == 0)
6535 free (cinfo.hashcodes);
6539 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6540 BFD_ASSERT (s != NULL);
6542 if (cinfo.nsyms == 0)
6544 /* Empty .gnu.hash section is special. */
6545 BFD_ASSERT (cinfo.min_dynindx == -1);
6546 free (cinfo.hashcodes);
6547 s->size = 5 * 4 + bed->s->arch_size / 8;
6548 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6549 if (contents == NULL)
6551 s->contents = contents;
6552 /* 1 empty bucket. */
6553 bfd_put_32 (output_bfd, 1, contents);
6554 /* SYMIDX above the special symbol 0. */
6555 bfd_put_32 (output_bfd, 1, contents + 4);
6556 /* Just one word for bitmask. */
6557 bfd_put_32 (output_bfd, 1, contents + 8);
6558 /* Only hash fn bloom filter. */
6559 bfd_put_32 (output_bfd, 0, contents + 12);
6560 /* No hashes are valid - empty bitmask. */
6561 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6562 /* No hashes in the only bucket. */
6563 bfd_put_32 (output_bfd, 0,
6564 contents + 16 + bed->s->arch_size / 8);
6568 unsigned long int maskwords, maskbitslog2, x;
6569 BFD_ASSERT (cinfo.min_dynindx != -1);
6573 while ((x >>= 1) != 0)
6575 if (maskbitslog2 < 3)
6577 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6578 maskbitslog2 = maskbitslog2 + 3;
6580 maskbitslog2 = maskbitslog2 + 2;
6581 if (bed->s->arch_size == 64)
6583 if (maskbitslog2 == 5)
6589 cinfo.mask = (1 << cinfo.shift1) - 1;
6590 cinfo.shift2 = maskbitslog2;
6591 cinfo.maskbits = 1 << maskbitslog2;
6592 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6593 amt = bucketcount * sizeof (unsigned long int) * 2;
6594 amt += maskwords * sizeof (bfd_vma);
6595 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6596 if (cinfo.bitmask == NULL)
6598 free (cinfo.hashcodes);
6602 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6603 cinfo.indx = cinfo.counts + bucketcount;
6604 cinfo.symindx = dynsymcount - cinfo.nsyms;
6605 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6607 /* Determine how often each hash bucket is used. */
6608 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6609 for (i = 0; i < cinfo.nsyms; ++i)
6610 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6612 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6613 if (cinfo.counts[i] != 0)
6615 cinfo.indx[i] = cnt;
6616 cnt += cinfo.counts[i];
6618 BFD_ASSERT (cnt == dynsymcount);
6619 cinfo.bucketcount = bucketcount;
6620 cinfo.local_indx = cinfo.min_dynindx;
6622 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6623 s->size += cinfo.maskbits / 8;
6624 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6625 if (contents == NULL)
6627 free (cinfo.bitmask);
6628 free (cinfo.hashcodes);
6632 s->contents = contents;
6633 bfd_put_32 (output_bfd, bucketcount, contents);
6634 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6635 bfd_put_32 (output_bfd, maskwords, contents + 8);
6636 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6637 contents += 16 + cinfo.maskbits / 8;
6639 for (i = 0; i < bucketcount; ++i)
6641 if (cinfo.counts[i] == 0)
6642 bfd_put_32 (output_bfd, 0, contents);
6644 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6648 cinfo.contents = contents;
6650 /* Renumber dynamic symbols, populate .gnu.hash section. */
6651 elf_link_hash_traverse (elf_hash_table (info),
6652 elf_renumber_gnu_hash_syms, &cinfo);
6654 contents = s->contents + 16;
6655 for (i = 0; i < maskwords; ++i)
6657 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6659 contents += bed->s->arch_size / 8;
6662 free (cinfo.bitmask);
6663 free (cinfo.hashcodes);
6667 s = bfd_get_linker_section (dynobj, ".dynstr");
6668 BFD_ASSERT (s != NULL);
6670 elf_finalize_dynstr (output_bfd, info);
6672 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6674 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6675 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6682 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6685 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6688 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6689 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6692 /* Finish SHF_MERGE section merging. */
6695 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6700 if (!is_elf_hash_table (info->hash))
6703 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6704 if ((ibfd->flags & DYNAMIC) == 0)
6705 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6706 if ((sec->flags & SEC_MERGE) != 0
6707 && !bfd_is_abs_section (sec->output_section))
6709 struct bfd_elf_section_data *secdata;
6711 secdata = elf_section_data (sec);
6712 if (! _bfd_add_merge_section (abfd,
6713 &elf_hash_table (info)->merge_info,
6714 sec, &secdata->sec_info))
6716 else if (secdata->sec_info)
6717 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6720 if (elf_hash_table (info)->merge_info != NULL)
6721 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6722 merge_sections_remove_hook);
6726 /* Create an entry in an ELF linker hash table. */
6728 struct bfd_hash_entry *
6729 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6730 struct bfd_hash_table *table,
6733 /* Allocate the structure if it has not already been allocated by a
6737 entry = (struct bfd_hash_entry *)
6738 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6743 /* Call the allocation method of the superclass. */
6744 entry = _bfd_link_hash_newfunc (entry, table, string);
6747 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6748 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6750 /* Set local fields. */
6753 ret->got = htab->init_got_refcount;
6754 ret->plt = htab->init_plt_refcount;
6755 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6756 - offsetof (struct elf_link_hash_entry, size)));
6757 /* Assume that we have been called by a non-ELF symbol reader.
6758 This flag is then reset by the code which reads an ELF input
6759 file. This ensures that a symbol created by a non-ELF symbol
6760 reader will have the flag set correctly. */
6767 /* Copy data from an indirect symbol to its direct symbol, hiding the
6768 old indirect symbol. Also used for copying flags to a weakdef. */
6771 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6772 struct elf_link_hash_entry *dir,
6773 struct elf_link_hash_entry *ind)
6775 struct elf_link_hash_table *htab;
6777 /* Copy down any references that we may have already seen to the
6778 symbol which just became indirect. */
6780 dir->ref_dynamic |= ind->ref_dynamic;
6781 dir->ref_regular |= ind->ref_regular;
6782 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6783 dir->non_got_ref |= ind->non_got_ref;
6784 dir->needs_plt |= ind->needs_plt;
6785 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6787 if (ind->root.type != bfd_link_hash_indirect)
6790 /* Copy over the global and procedure linkage table refcount entries.
6791 These may have been already set up by a check_relocs routine. */
6792 htab = elf_hash_table (info);
6793 if (ind->got.refcount > htab->init_got_refcount.refcount)
6795 if (dir->got.refcount < 0)
6796 dir->got.refcount = 0;
6797 dir->got.refcount += ind->got.refcount;
6798 ind->got.refcount = htab->init_got_refcount.refcount;
6801 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6803 if (dir->plt.refcount < 0)
6804 dir->plt.refcount = 0;
6805 dir->plt.refcount += ind->plt.refcount;
6806 ind->plt.refcount = htab->init_plt_refcount.refcount;
6809 if (ind->dynindx != -1)
6811 if (dir->dynindx != -1)
6812 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6813 dir->dynindx = ind->dynindx;
6814 dir->dynstr_index = ind->dynstr_index;
6816 ind->dynstr_index = 0;
6821 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6822 struct elf_link_hash_entry *h,
6823 bfd_boolean force_local)
6825 /* STT_GNU_IFUNC symbol must go through PLT. */
6826 if (h->type != STT_GNU_IFUNC)
6828 h->plt = elf_hash_table (info)->init_plt_offset;
6833 h->forced_local = 1;
6834 if (h->dynindx != -1)
6837 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6843 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
6847 _bfd_elf_link_hash_table_init
6848 (struct elf_link_hash_table *table,
6850 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6851 struct bfd_hash_table *,
6853 unsigned int entsize,
6854 enum elf_target_id target_id)
6857 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6859 table->init_got_refcount.refcount = can_refcount - 1;
6860 table->init_plt_refcount.refcount = can_refcount - 1;
6861 table->init_got_offset.offset = -(bfd_vma) 1;
6862 table->init_plt_offset.offset = -(bfd_vma) 1;
6863 /* The first dynamic symbol is a dummy. */
6864 table->dynsymcount = 1;
6866 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6868 table->root.type = bfd_link_elf_hash_table;
6869 table->hash_table_id = target_id;
6874 /* Create an ELF linker hash table. */
6876 struct bfd_link_hash_table *
6877 _bfd_elf_link_hash_table_create (bfd *abfd)
6879 struct elf_link_hash_table *ret;
6880 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6882 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
6886 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6887 sizeof (struct elf_link_hash_entry),
6893 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
6898 /* Destroy an ELF linker hash table. */
6901 _bfd_elf_link_hash_table_free (bfd *obfd)
6903 struct elf_link_hash_table *htab;
6905 htab = (struct elf_link_hash_table *) obfd->link.hash;
6906 if (htab->dynstr != NULL)
6907 _bfd_elf_strtab_free (htab->dynstr);
6908 _bfd_merge_sections_free (htab->merge_info);
6909 _bfd_generic_link_hash_table_free (obfd);
6912 /* This is a hook for the ELF emulation code in the generic linker to
6913 tell the backend linker what file name to use for the DT_NEEDED
6914 entry for a dynamic object. */
6917 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6919 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6920 && bfd_get_format (abfd) == bfd_object)
6921 elf_dt_name (abfd) = name;
6925 bfd_elf_get_dyn_lib_class (bfd *abfd)
6928 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6929 && bfd_get_format (abfd) == bfd_object)
6930 lib_class = elf_dyn_lib_class (abfd);
6937 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6939 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6940 && bfd_get_format (abfd) == bfd_object)
6941 elf_dyn_lib_class (abfd) = lib_class;
6944 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6945 the linker ELF emulation code. */
6947 struct bfd_link_needed_list *
6948 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6949 struct bfd_link_info *info)
6951 if (! is_elf_hash_table (info->hash))
6953 return elf_hash_table (info)->needed;
6956 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6957 hook for the linker ELF emulation code. */
6959 struct bfd_link_needed_list *
6960 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6961 struct bfd_link_info *info)
6963 if (! is_elf_hash_table (info->hash))
6965 return elf_hash_table (info)->runpath;
6968 /* Get the name actually used for a dynamic object for a link. This
6969 is the SONAME entry if there is one. Otherwise, it is the string
6970 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6973 bfd_elf_get_dt_soname (bfd *abfd)
6975 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6976 && bfd_get_format (abfd) == bfd_object)
6977 return elf_dt_name (abfd);
6981 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6982 the ELF linker emulation code. */
6985 bfd_elf_get_bfd_needed_list (bfd *abfd,
6986 struct bfd_link_needed_list **pneeded)
6989 bfd_byte *dynbuf = NULL;
6990 unsigned int elfsec;
6991 unsigned long shlink;
6992 bfd_byte *extdyn, *extdynend;
6994 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6998 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6999 || bfd_get_format (abfd) != bfd_object)
7002 s = bfd_get_section_by_name (abfd, ".dynamic");
7003 if (s == NULL || s->size == 0)
7006 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
7009 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
7010 if (elfsec == SHN_BAD)
7013 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
7015 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
7016 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
7019 extdynend = extdyn + s->size;
7020 for (; extdyn < extdynend; extdyn += extdynsize)
7022 Elf_Internal_Dyn dyn;
7024 (*swap_dyn_in) (abfd, extdyn, &dyn);
7026 if (dyn.d_tag == DT_NULL)
7029 if (dyn.d_tag == DT_NEEDED)
7032 struct bfd_link_needed_list *l;
7033 unsigned int tagv = dyn.d_un.d_val;
7036 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7041 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7062 struct elf_symbuf_symbol
7064 unsigned long st_name; /* Symbol name, index in string tbl */
7065 unsigned char st_info; /* Type and binding attributes */
7066 unsigned char st_other; /* Visibilty, and target specific */
7069 struct elf_symbuf_head
7071 struct elf_symbuf_symbol *ssym;
7072 bfd_size_type count;
7073 unsigned int st_shndx;
7080 Elf_Internal_Sym *isym;
7081 struct elf_symbuf_symbol *ssym;
7086 /* Sort references to symbols by ascending section number. */
7089 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7091 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7092 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7094 return s1->st_shndx - s2->st_shndx;
7098 elf_sym_name_compare (const void *arg1, const void *arg2)
7100 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7101 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7102 return strcmp (s1->name, s2->name);
7105 static struct elf_symbuf_head *
7106 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7108 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7109 struct elf_symbuf_symbol *ssym;
7110 struct elf_symbuf_head *ssymbuf, *ssymhead;
7111 bfd_size_type i, shndx_count, total_size;
7113 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7117 for (ind = indbuf, i = 0; i < symcount; i++)
7118 if (isymbuf[i].st_shndx != SHN_UNDEF)
7119 *ind++ = &isymbuf[i];
7122 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7123 elf_sort_elf_symbol);
7126 if (indbufend > indbuf)
7127 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7128 if (ind[0]->st_shndx != ind[1]->st_shndx)
7131 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7132 + (indbufend - indbuf) * sizeof (*ssym));
7133 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7134 if (ssymbuf == NULL)
7140 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7141 ssymbuf->ssym = NULL;
7142 ssymbuf->count = shndx_count;
7143 ssymbuf->st_shndx = 0;
7144 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7146 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7149 ssymhead->ssym = ssym;
7150 ssymhead->count = 0;
7151 ssymhead->st_shndx = (*ind)->st_shndx;
7153 ssym->st_name = (*ind)->st_name;
7154 ssym->st_info = (*ind)->st_info;
7155 ssym->st_other = (*ind)->st_other;
7158 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7159 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7166 /* Check if 2 sections define the same set of local and global
7170 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7171 struct bfd_link_info *info)
7174 const struct elf_backend_data *bed1, *bed2;
7175 Elf_Internal_Shdr *hdr1, *hdr2;
7176 bfd_size_type symcount1, symcount2;
7177 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7178 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7179 Elf_Internal_Sym *isym, *isymend;
7180 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7181 bfd_size_type count1, count2, i;
7182 unsigned int shndx1, shndx2;
7188 /* Both sections have to be in ELF. */
7189 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7190 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7193 if (elf_section_type (sec1) != elf_section_type (sec2))
7196 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7197 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7198 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7201 bed1 = get_elf_backend_data (bfd1);
7202 bed2 = get_elf_backend_data (bfd2);
7203 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7204 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7205 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7206 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7208 if (symcount1 == 0 || symcount2 == 0)
7214 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7215 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7217 if (ssymbuf1 == NULL)
7219 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7221 if (isymbuf1 == NULL)
7224 if (!info->reduce_memory_overheads)
7225 elf_tdata (bfd1)->symbuf = ssymbuf1
7226 = elf_create_symbuf (symcount1, isymbuf1);
7229 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7231 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7233 if (isymbuf2 == NULL)
7236 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7237 elf_tdata (bfd2)->symbuf = ssymbuf2
7238 = elf_create_symbuf (symcount2, isymbuf2);
7241 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7243 /* Optimized faster version. */
7244 bfd_size_type lo, hi, mid;
7245 struct elf_symbol *symp;
7246 struct elf_symbuf_symbol *ssym, *ssymend;
7249 hi = ssymbuf1->count;
7254 mid = (lo + hi) / 2;
7255 if (shndx1 < ssymbuf1[mid].st_shndx)
7257 else if (shndx1 > ssymbuf1[mid].st_shndx)
7261 count1 = ssymbuf1[mid].count;
7268 hi = ssymbuf2->count;
7273 mid = (lo + hi) / 2;
7274 if (shndx2 < ssymbuf2[mid].st_shndx)
7276 else if (shndx2 > ssymbuf2[mid].st_shndx)
7280 count2 = ssymbuf2[mid].count;
7286 if (count1 == 0 || count2 == 0 || count1 != count2)
7289 symtable1 = (struct elf_symbol *)
7290 bfd_malloc (count1 * sizeof (struct elf_symbol));
7291 symtable2 = (struct elf_symbol *)
7292 bfd_malloc (count2 * sizeof (struct elf_symbol));
7293 if (symtable1 == NULL || symtable2 == NULL)
7297 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7298 ssym < ssymend; ssym++, symp++)
7300 symp->u.ssym = ssym;
7301 symp->name = bfd_elf_string_from_elf_section (bfd1,
7307 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7308 ssym < ssymend; ssym++, symp++)
7310 symp->u.ssym = ssym;
7311 symp->name = bfd_elf_string_from_elf_section (bfd2,
7316 /* Sort symbol by name. */
7317 qsort (symtable1, count1, sizeof (struct elf_symbol),
7318 elf_sym_name_compare);
7319 qsort (symtable2, count1, sizeof (struct elf_symbol),
7320 elf_sym_name_compare);
7322 for (i = 0; i < count1; i++)
7323 /* Two symbols must have the same binding, type and name. */
7324 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7325 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7326 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7333 symtable1 = (struct elf_symbol *)
7334 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7335 symtable2 = (struct elf_symbol *)
7336 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7337 if (symtable1 == NULL || symtable2 == NULL)
7340 /* Count definitions in the section. */
7342 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7343 if (isym->st_shndx == shndx1)
7344 symtable1[count1++].u.isym = isym;
7347 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7348 if (isym->st_shndx == shndx2)
7349 symtable2[count2++].u.isym = isym;
7351 if (count1 == 0 || count2 == 0 || count1 != count2)
7354 for (i = 0; i < count1; i++)
7356 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7357 symtable1[i].u.isym->st_name);
7359 for (i = 0; i < count2; i++)
7361 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7362 symtable2[i].u.isym->st_name);
7364 /* Sort symbol by name. */
7365 qsort (symtable1, count1, sizeof (struct elf_symbol),
7366 elf_sym_name_compare);
7367 qsort (symtable2, count1, sizeof (struct elf_symbol),
7368 elf_sym_name_compare);
7370 for (i = 0; i < count1; i++)
7371 /* Two symbols must have the same binding, type and name. */
7372 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7373 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7374 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7392 /* Return TRUE if 2 section types are compatible. */
7395 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7396 bfd *bbfd, const asection *bsec)
7400 || abfd->xvec->flavour != bfd_target_elf_flavour
7401 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7404 return elf_section_type (asec) == elf_section_type (bsec);
7407 /* Final phase of ELF linker. */
7409 /* A structure we use to avoid passing large numbers of arguments. */
7411 struct elf_final_link_info
7413 /* General link information. */
7414 struct bfd_link_info *info;
7417 /* Symbol string table. */
7418 struct bfd_strtab_hash *symstrtab;
7419 /* .dynsym section. */
7420 asection *dynsym_sec;
7421 /* .hash section. */
7423 /* symbol version section (.gnu.version). */
7424 asection *symver_sec;
7425 /* Buffer large enough to hold contents of any section. */
7427 /* Buffer large enough to hold external relocs of any section. */
7428 void *external_relocs;
7429 /* Buffer large enough to hold internal relocs of any section. */
7430 Elf_Internal_Rela *internal_relocs;
7431 /* Buffer large enough to hold external local symbols of any input
7433 bfd_byte *external_syms;
7434 /* And a buffer for symbol section indices. */
7435 Elf_External_Sym_Shndx *locsym_shndx;
7436 /* Buffer large enough to hold internal local symbols of any input
7438 Elf_Internal_Sym *internal_syms;
7439 /* Array large enough to hold a symbol index for each local symbol
7440 of any input BFD. */
7442 /* Array large enough to hold a section pointer for each local
7443 symbol of any input BFD. */
7444 asection **sections;
7445 /* Buffer to hold swapped out symbols. */
7447 /* And one for symbol section indices. */
7448 Elf_External_Sym_Shndx *symshndxbuf;
7449 /* Number of swapped out symbols in buffer. */
7450 size_t symbuf_count;
7451 /* Number of symbols which fit in symbuf. */
7453 /* And same for symshndxbuf. */
7454 size_t shndxbuf_size;
7455 /* Number of STT_FILE syms seen. */
7456 size_t filesym_count;
7459 /* This struct is used to pass information to elf_link_output_extsym. */
7461 struct elf_outext_info
7464 bfd_boolean localsyms;
7465 bfd_boolean need_second_pass;
7466 bfd_boolean second_pass;
7467 bfd_boolean file_sym_done;
7468 struct elf_final_link_info *flinfo;
7472 /* Support for evaluating a complex relocation.
7474 Complex relocations are generalized, self-describing relocations. The
7475 implementation of them consists of two parts: complex symbols, and the
7476 relocations themselves.
7478 The relocations are use a reserved elf-wide relocation type code (R_RELC
7479 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7480 information (start bit, end bit, word width, etc) into the addend. This
7481 information is extracted from CGEN-generated operand tables within gas.
7483 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7484 internal) representing prefix-notation expressions, including but not
7485 limited to those sorts of expressions normally encoded as addends in the
7486 addend field. The symbol mangling format is:
7489 | <unary-operator> ':' <node>
7490 | <binary-operator> ':' <node> ':' <node>
7493 <literal> := 's' <digits=N> ':' <N character symbol name>
7494 | 'S' <digits=N> ':' <N character section name>
7498 <binary-operator> := as in C
7499 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7502 set_symbol_value (bfd *bfd_with_globals,
7503 Elf_Internal_Sym *isymbuf,
7508 struct elf_link_hash_entry **sym_hashes;
7509 struct elf_link_hash_entry *h;
7510 size_t extsymoff = locsymcount;
7512 if (symidx < locsymcount)
7514 Elf_Internal_Sym *sym;
7516 sym = isymbuf + symidx;
7517 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7519 /* It is a local symbol: move it to the
7520 "absolute" section and give it a value. */
7521 sym->st_shndx = SHN_ABS;
7522 sym->st_value = val;
7525 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7529 /* It is a global symbol: set its link type
7530 to "defined" and give it a value. */
7532 sym_hashes = elf_sym_hashes (bfd_with_globals);
7533 h = sym_hashes [symidx - extsymoff];
7534 while (h->root.type == bfd_link_hash_indirect
7535 || h->root.type == bfd_link_hash_warning)
7536 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7537 h->root.type = bfd_link_hash_defined;
7538 h->root.u.def.value = val;
7539 h->root.u.def.section = bfd_abs_section_ptr;
7543 resolve_symbol (const char *name,
7545 struct elf_final_link_info *flinfo,
7547 Elf_Internal_Sym *isymbuf,
7550 Elf_Internal_Sym *sym;
7551 struct bfd_link_hash_entry *global_entry;
7552 const char *candidate = NULL;
7553 Elf_Internal_Shdr *symtab_hdr;
7556 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7558 for (i = 0; i < locsymcount; ++ i)
7562 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7565 candidate = bfd_elf_string_from_elf_section (input_bfd,
7566 symtab_hdr->sh_link,
7569 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7570 name, candidate, (unsigned long) sym->st_value);
7572 if (candidate && strcmp (candidate, name) == 0)
7574 asection *sec = flinfo->sections [i];
7576 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7577 *result += sec->output_offset + sec->output_section->vma;
7579 printf ("Found symbol with value %8.8lx\n",
7580 (unsigned long) *result);
7586 /* Hmm, haven't found it yet. perhaps it is a global. */
7587 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7588 FALSE, FALSE, TRUE);
7592 if (global_entry->type == bfd_link_hash_defined
7593 || global_entry->type == bfd_link_hash_defweak)
7595 *result = (global_entry->u.def.value
7596 + global_entry->u.def.section->output_section->vma
7597 + global_entry->u.def.section->output_offset);
7599 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7600 global_entry->root.string, (unsigned long) *result);
7609 resolve_section (const char *name,
7616 for (curr = sections; curr; curr = curr->next)
7617 if (strcmp (curr->name, name) == 0)
7619 *result = curr->vma;
7623 /* Hmm. still haven't found it. try pseudo-section names. */
7624 for (curr = sections; curr; curr = curr->next)
7626 len = strlen (curr->name);
7627 if (len > strlen (name))
7630 if (strncmp (curr->name, name, len) == 0)
7632 if (strncmp (".end", name + len, 4) == 0)
7634 *result = curr->vma + curr->size;
7638 /* Insert more pseudo-section names here, if you like. */
7646 undefined_reference (const char *reftype, const char *name)
7648 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7653 eval_symbol (bfd_vma *result,
7656 struct elf_final_link_info *flinfo,
7658 Elf_Internal_Sym *isymbuf,
7667 const char *sym = *symp;
7669 bfd_boolean symbol_is_section = FALSE;
7674 if (len < 1 || len > sizeof (symbuf))
7676 bfd_set_error (bfd_error_invalid_operation);
7689 *result = strtoul (sym, (char **) symp, 16);
7693 symbol_is_section = TRUE;
7696 symlen = strtol (sym, (char **) symp, 10);
7697 sym = *symp + 1; /* Skip the trailing ':'. */
7699 if (symend < sym || symlen + 1 > sizeof (symbuf))
7701 bfd_set_error (bfd_error_invalid_operation);
7705 memcpy (symbuf, sym, symlen);
7706 symbuf[symlen] = '\0';
7707 *symp = sym + symlen;
7709 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7710 the symbol as a section, or vice-versa. so we're pretty liberal in our
7711 interpretation here; section means "try section first", not "must be a
7712 section", and likewise with symbol. */
7714 if (symbol_is_section)
7716 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result)
7717 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7718 isymbuf, locsymcount))
7720 undefined_reference ("section", symbuf);
7726 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7727 isymbuf, locsymcount)
7728 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7731 undefined_reference ("symbol", symbuf);
7738 /* All that remains are operators. */
7740 #define UNARY_OP(op) \
7741 if (strncmp (sym, #op, strlen (#op)) == 0) \
7743 sym += strlen (#op); \
7747 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7748 isymbuf, locsymcount, signed_p)) \
7751 *result = op ((bfd_signed_vma) a); \
7757 #define BINARY_OP(op) \
7758 if (strncmp (sym, #op, strlen (#op)) == 0) \
7760 sym += strlen (#op); \
7764 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7765 isymbuf, locsymcount, signed_p)) \
7768 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7769 isymbuf, locsymcount, signed_p)) \
7772 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7802 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7803 bfd_set_error (bfd_error_invalid_operation);
7809 put_value (bfd_vma size,
7810 unsigned long chunksz,
7815 location += (size - chunksz);
7817 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7825 bfd_put_8 (input_bfd, x, location);
7828 bfd_put_16 (input_bfd, x, location);
7831 bfd_put_32 (input_bfd, x, location);
7835 bfd_put_64 (input_bfd, x, location);
7845 get_value (bfd_vma size,
7846 unsigned long chunksz,
7853 /* Sanity checks. */
7854 BFD_ASSERT (chunksz <= sizeof (x)
7857 && (size % chunksz) == 0
7858 && input_bfd != NULL
7859 && location != NULL);
7861 if (chunksz == sizeof (x))
7863 BFD_ASSERT (size == chunksz);
7865 /* Make sure that we do not perform an undefined shift operation.
7866 We know that size == chunksz so there will only be one iteration
7867 of the loop below. */
7871 shift = 8 * chunksz;
7873 for (; size; size -= chunksz, location += chunksz)
7878 x = (x << shift) | bfd_get_8 (input_bfd, location);
7881 x = (x << shift) | bfd_get_16 (input_bfd, location);
7884 x = (x << shift) | bfd_get_32 (input_bfd, location);
7888 x = (x << shift) | bfd_get_64 (input_bfd, location);
7899 decode_complex_addend (unsigned long *start, /* in bits */
7900 unsigned long *oplen, /* in bits */
7901 unsigned long *len, /* in bits */
7902 unsigned long *wordsz, /* in bytes */
7903 unsigned long *chunksz, /* in bytes */
7904 unsigned long *lsb0_p,
7905 unsigned long *signed_p,
7906 unsigned long *trunc_p,
7907 unsigned long encoded)
7909 * start = encoded & 0x3F;
7910 * len = (encoded >> 6) & 0x3F;
7911 * oplen = (encoded >> 12) & 0x3F;
7912 * wordsz = (encoded >> 18) & 0xF;
7913 * chunksz = (encoded >> 22) & 0xF;
7914 * lsb0_p = (encoded >> 27) & 1;
7915 * signed_p = (encoded >> 28) & 1;
7916 * trunc_p = (encoded >> 29) & 1;
7919 bfd_reloc_status_type
7920 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7921 asection *input_section ATTRIBUTE_UNUSED,
7923 Elf_Internal_Rela *rel,
7926 bfd_vma shift, x, mask;
7927 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7928 bfd_reloc_status_type r;
7930 /* Perform this reloc, since it is complex.
7931 (this is not to say that it necessarily refers to a complex
7932 symbol; merely that it is a self-describing CGEN based reloc.
7933 i.e. the addend has the complete reloc information (bit start, end,
7934 word size, etc) encoded within it.). */
7936 decode_complex_addend (&start, &oplen, &len, &wordsz,
7937 &chunksz, &lsb0_p, &signed_p,
7938 &trunc_p, rel->r_addend);
7940 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7943 shift = (start + 1) - len;
7945 shift = (8 * wordsz) - (start + len);
7947 /* FIXME: octets_per_byte. */
7948 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7951 printf ("Doing complex reloc: "
7952 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7953 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7954 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7955 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7956 oplen, (unsigned long) x, (unsigned long) mask,
7957 (unsigned long) relocation);
7962 /* Now do an overflow check. */
7963 r = bfd_check_overflow ((signed_p
7964 ? complain_overflow_signed
7965 : complain_overflow_unsigned),
7966 len, 0, (8 * wordsz),
7970 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7973 printf (" relocation: %8.8lx\n"
7974 " shifted mask: %8.8lx\n"
7975 " shifted/masked reloc: %8.8lx\n"
7976 " result: %8.8lx\n",
7977 (unsigned long) relocation, (unsigned long) (mask << shift),
7978 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
7980 /* FIXME: octets_per_byte. */
7981 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7985 /* When performing a relocatable link, the input relocations are
7986 preserved. But, if they reference global symbols, the indices
7987 referenced must be updated. Update all the relocations found in
7991 elf_link_adjust_relocs (bfd *abfd,
7992 struct bfd_elf_section_reloc_data *reldata)
7995 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7997 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7998 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7999 bfd_vma r_type_mask;
8001 unsigned int count = reldata->count;
8002 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8004 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8006 swap_in = bed->s->swap_reloc_in;
8007 swap_out = bed->s->swap_reloc_out;
8009 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8011 swap_in = bed->s->swap_reloca_in;
8012 swap_out = bed->s->swap_reloca_out;
8017 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8020 if (bed->s->arch_size == 32)
8027 r_type_mask = 0xffffffff;
8031 erela = reldata->hdr->contents;
8032 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8034 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8037 if (*rel_hash == NULL)
8040 BFD_ASSERT ((*rel_hash)->indx >= 0);
8042 (*swap_in) (abfd, erela, irela);
8043 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8044 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8045 | (irela[j].r_info & r_type_mask));
8046 (*swap_out) (abfd, irela, erela);
8050 struct elf_link_sort_rela
8056 enum elf_reloc_type_class type;
8057 /* We use this as an array of size int_rels_per_ext_rel. */
8058 Elf_Internal_Rela rela[1];
8062 elf_link_sort_cmp1 (const void *A, const void *B)
8064 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8065 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8066 int relativea, relativeb;
8068 relativea = a->type == reloc_class_relative;
8069 relativeb = b->type == reloc_class_relative;
8071 if (relativea < relativeb)
8073 if (relativea > relativeb)
8075 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8077 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8079 if (a->rela->r_offset < b->rela->r_offset)
8081 if (a->rela->r_offset > b->rela->r_offset)
8087 elf_link_sort_cmp2 (const void *A, const void *B)
8089 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8090 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8092 if (a->type < b->type)
8094 if (a->type > b->type)
8096 if (a->u.offset < b->u.offset)
8098 if (a->u.offset > b->u.offset)
8100 if (a->rela->r_offset < b->rela->r_offset)
8102 if (a->rela->r_offset > b->rela->r_offset)
8108 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8110 asection *dynamic_relocs;
8113 bfd_size_type count, size;
8114 size_t i, ret, sort_elt, ext_size;
8115 bfd_byte *sort, *s_non_relative, *p;
8116 struct elf_link_sort_rela *sq;
8117 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8118 int i2e = bed->s->int_rels_per_ext_rel;
8119 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8120 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8121 struct bfd_link_order *lo;
8123 bfd_boolean use_rela;
8125 /* Find a dynamic reloc section. */
8126 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8127 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8128 if (rela_dyn != NULL && rela_dyn->size > 0
8129 && rel_dyn != NULL && rel_dyn->size > 0)
8131 bfd_boolean use_rela_initialised = FALSE;
8133 /* This is just here to stop gcc from complaining.
8134 It's initialization checking code is not perfect. */
8137 /* Both sections are present. Examine the sizes
8138 of the indirect sections to help us choose. */
8139 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8140 if (lo->type == bfd_indirect_link_order)
8142 asection *o = lo->u.indirect.section;
8144 if ((o->size % bed->s->sizeof_rela) == 0)
8146 if ((o->size % bed->s->sizeof_rel) == 0)
8147 /* Section size is divisible by both rel and rela sizes.
8148 It is of no help to us. */
8152 /* Section size is only divisible by rela. */
8153 if (use_rela_initialised && (use_rela == FALSE))
8156 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8157 bfd_set_error (bfd_error_invalid_operation);
8163 use_rela_initialised = TRUE;
8167 else if ((o->size % bed->s->sizeof_rel) == 0)
8169 /* Section size is only divisible by rel. */
8170 if (use_rela_initialised && (use_rela == TRUE))
8173 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8174 bfd_set_error (bfd_error_invalid_operation);
8180 use_rela_initialised = TRUE;
8185 /* The section size is not divisible by either - something is wrong. */
8187 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8188 bfd_set_error (bfd_error_invalid_operation);
8193 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8194 if (lo->type == bfd_indirect_link_order)
8196 asection *o = lo->u.indirect.section;
8198 if ((o->size % bed->s->sizeof_rela) == 0)
8200 if ((o->size % bed->s->sizeof_rel) == 0)
8201 /* Section size is divisible by both rel and rela sizes.
8202 It is of no help to us. */
8206 /* Section size is only divisible by rela. */
8207 if (use_rela_initialised && (use_rela == FALSE))
8210 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8211 bfd_set_error (bfd_error_invalid_operation);
8217 use_rela_initialised = TRUE;
8221 else if ((o->size % bed->s->sizeof_rel) == 0)
8223 /* Section size is only divisible by rel. */
8224 if (use_rela_initialised && (use_rela == TRUE))
8227 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8228 bfd_set_error (bfd_error_invalid_operation);
8234 use_rela_initialised = TRUE;
8239 /* The section size is not divisible by either - something is wrong. */
8241 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8242 bfd_set_error (bfd_error_invalid_operation);
8247 if (! use_rela_initialised)
8251 else if (rela_dyn != NULL && rela_dyn->size > 0)
8253 else if (rel_dyn != NULL && rel_dyn->size > 0)
8260 dynamic_relocs = rela_dyn;
8261 ext_size = bed->s->sizeof_rela;
8262 swap_in = bed->s->swap_reloca_in;
8263 swap_out = bed->s->swap_reloca_out;
8267 dynamic_relocs = rel_dyn;
8268 ext_size = bed->s->sizeof_rel;
8269 swap_in = bed->s->swap_reloc_in;
8270 swap_out = bed->s->swap_reloc_out;
8274 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8275 if (lo->type == bfd_indirect_link_order)
8276 size += lo->u.indirect.section->size;
8278 if (size != dynamic_relocs->size)
8281 sort_elt = (sizeof (struct elf_link_sort_rela)
8282 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8284 count = dynamic_relocs->size / ext_size;
8287 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8291 (*info->callbacks->warning)
8292 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8296 if (bed->s->arch_size == 32)
8297 r_sym_mask = ~(bfd_vma) 0xff;
8299 r_sym_mask = ~(bfd_vma) 0xffffffff;
8301 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8302 if (lo->type == bfd_indirect_link_order)
8304 bfd_byte *erel, *erelend;
8305 asection *o = lo->u.indirect.section;
8307 if (o->contents == NULL && o->size != 0)
8309 /* This is a reloc section that is being handled as a normal
8310 section. See bfd_section_from_shdr. We can't combine
8311 relocs in this case. */
8316 erelend = o->contents + o->size;
8317 /* FIXME: octets_per_byte. */
8318 p = sort + o->output_offset / ext_size * sort_elt;
8320 while (erel < erelend)
8322 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8324 (*swap_in) (abfd, erel, s->rela);
8325 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8326 s->u.sym_mask = r_sym_mask;
8332 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8334 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8336 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8337 if (s->type != reloc_class_relative)
8343 sq = (struct elf_link_sort_rela *) s_non_relative;
8344 for (; i < count; i++, p += sort_elt)
8346 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8347 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8349 sp->u.offset = sq->rela->r_offset;
8352 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8354 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8355 if (lo->type == bfd_indirect_link_order)
8357 bfd_byte *erel, *erelend;
8358 asection *o = lo->u.indirect.section;
8361 erelend = o->contents + o->size;
8362 /* FIXME: octets_per_byte. */
8363 p = sort + o->output_offset / ext_size * sort_elt;
8364 while (erel < erelend)
8366 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8367 (*swap_out) (abfd, s->rela, erel);
8374 *psec = dynamic_relocs;
8378 /* Flush the output symbols to the file. */
8381 elf_link_flush_output_syms (struct elf_final_link_info *flinfo,
8382 const struct elf_backend_data *bed)
8384 if (flinfo->symbuf_count > 0)
8386 Elf_Internal_Shdr *hdr;
8390 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8391 pos = hdr->sh_offset + hdr->sh_size;
8392 amt = flinfo->symbuf_count * bed->s->sizeof_sym;
8393 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) != 0
8394 || bfd_bwrite (flinfo->symbuf, amt, flinfo->output_bfd) != amt)
8397 hdr->sh_size += amt;
8398 flinfo->symbuf_count = 0;
8404 /* Add a symbol to the output symbol table. */
8407 elf_link_output_sym (struct elf_final_link_info *flinfo,
8409 Elf_Internal_Sym *elfsym,
8410 asection *input_sec,
8411 struct elf_link_hash_entry *h)
8414 Elf_External_Sym_Shndx *destshndx;
8415 int (*output_symbol_hook)
8416 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8417 struct elf_link_hash_entry *);
8418 const struct elf_backend_data *bed;
8420 bed = get_elf_backend_data (flinfo->output_bfd);
8421 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8422 if (output_symbol_hook != NULL)
8424 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8429 if (name == NULL || *name == '\0')
8430 elfsym->st_name = 0;
8431 else if (input_sec->flags & SEC_EXCLUDE)
8432 elfsym->st_name = 0;
8435 elfsym->st_name = (unsigned long) _bfd_stringtab_add (flinfo->symstrtab,
8437 if (elfsym->st_name == (unsigned long) -1)
8441 if (flinfo->symbuf_count >= flinfo->symbuf_size)
8443 if (! elf_link_flush_output_syms (flinfo, bed))
8447 dest = flinfo->symbuf + flinfo->symbuf_count * bed->s->sizeof_sym;
8448 destshndx = flinfo->symshndxbuf;
8449 if (destshndx != NULL)
8451 if (bfd_get_symcount (flinfo->output_bfd) >= flinfo->shndxbuf_size)
8455 amt = flinfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8456 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8458 if (destshndx == NULL)
8460 flinfo->symshndxbuf = destshndx;
8461 memset ((char *) destshndx + amt, 0, amt);
8462 flinfo->shndxbuf_size *= 2;
8464 destshndx += bfd_get_symcount (flinfo->output_bfd);
8467 bed->s->swap_symbol_out (flinfo->output_bfd, elfsym, dest, destshndx);
8468 flinfo->symbuf_count += 1;
8469 bfd_get_symcount (flinfo->output_bfd) += 1;
8474 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8477 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8479 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8480 && sym->st_shndx < SHN_LORESERVE)
8482 /* The gABI doesn't support dynamic symbols in output sections
8484 (*_bfd_error_handler)
8485 (_("%B: Too many sections: %d (>= %d)"),
8486 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8487 bfd_set_error (bfd_error_nonrepresentable_section);
8493 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8494 allowing an unsatisfied unversioned symbol in the DSO to match a
8495 versioned symbol that would normally require an explicit version.
8496 We also handle the case that a DSO references a hidden symbol
8497 which may be satisfied by a versioned symbol in another DSO. */
8500 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8501 const struct elf_backend_data *bed,
8502 struct elf_link_hash_entry *h)
8505 struct elf_link_loaded_list *loaded;
8507 if (!is_elf_hash_table (info->hash))
8510 /* Check indirect symbol. */
8511 while (h->root.type == bfd_link_hash_indirect)
8512 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8514 switch (h->root.type)
8520 case bfd_link_hash_undefined:
8521 case bfd_link_hash_undefweak:
8522 abfd = h->root.u.undef.abfd;
8523 if ((abfd->flags & DYNAMIC) == 0
8524 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8528 case bfd_link_hash_defined:
8529 case bfd_link_hash_defweak:
8530 abfd = h->root.u.def.section->owner;
8533 case bfd_link_hash_common:
8534 abfd = h->root.u.c.p->section->owner;
8537 BFD_ASSERT (abfd != NULL);
8539 for (loaded = elf_hash_table (info)->loaded;
8541 loaded = loaded->next)
8544 Elf_Internal_Shdr *hdr;
8545 bfd_size_type symcount;
8546 bfd_size_type extsymcount;
8547 bfd_size_type extsymoff;
8548 Elf_Internal_Shdr *versymhdr;
8549 Elf_Internal_Sym *isym;
8550 Elf_Internal_Sym *isymend;
8551 Elf_Internal_Sym *isymbuf;
8552 Elf_External_Versym *ever;
8553 Elf_External_Versym *extversym;
8555 input = loaded->abfd;
8557 /* We check each DSO for a possible hidden versioned definition. */
8559 || (input->flags & DYNAMIC) == 0
8560 || elf_dynversym (input) == 0)
8563 hdr = &elf_tdata (input)->dynsymtab_hdr;
8565 symcount = hdr->sh_size / bed->s->sizeof_sym;
8566 if (elf_bad_symtab (input))
8568 extsymcount = symcount;
8573 extsymcount = symcount - hdr->sh_info;
8574 extsymoff = hdr->sh_info;
8577 if (extsymcount == 0)
8580 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8582 if (isymbuf == NULL)
8585 /* Read in any version definitions. */
8586 versymhdr = &elf_tdata (input)->dynversym_hdr;
8587 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8588 if (extversym == NULL)
8591 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8592 || (bfd_bread (extversym, versymhdr->sh_size, input)
8593 != versymhdr->sh_size))
8601 ever = extversym + extsymoff;
8602 isymend = isymbuf + extsymcount;
8603 for (isym = isymbuf; isym < isymend; isym++, ever++)
8606 Elf_Internal_Versym iver;
8607 unsigned short version_index;
8609 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8610 || isym->st_shndx == SHN_UNDEF)
8613 name = bfd_elf_string_from_elf_section (input,
8616 if (strcmp (name, h->root.root.string) != 0)
8619 _bfd_elf_swap_versym_in (input, ever, &iver);
8621 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8623 && h->forced_local))
8625 /* If we have a non-hidden versioned sym, then it should
8626 have provided a definition for the undefined sym unless
8627 it is defined in a non-shared object and forced local.
8632 version_index = iver.vs_vers & VERSYM_VERSION;
8633 if (version_index == 1 || version_index == 2)
8635 /* This is the base or first version. We can use it. */
8649 /* Add an external symbol to the symbol table. This is called from
8650 the hash table traversal routine. When generating a shared object,
8651 we go through the symbol table twice. The first time we output
8652 anything that might have been forced to local scope in a version
8653 script. The second time we output the symbols that are still
8657 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
8659 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
8660 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8661 struct elf_final_link_info *flinfo = eoinfo->flinfo;
8663 Elf_Internal_Sym sym;
8664 asection *input_sec;
8665 const struct elf_backend_data *bed;
8669 if (h->root.type == bfd_link_hash_warning)
8671 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8672 if (h->root.type == bfd_link_hash_new)
8676 /* Decide whether to output this symbol in this pass. */
8677 if (eoinfo->localsyms)
8679 if (!h->forced_local)
8681 if (eoinfo->second_pass
8682 && !((h->root.type == bfd_link_hash_defined
8683 || h->root.type == bfd_link_hash_defweak)
8684 && h->root.u.def.section->output_section != NULL))
8687 if (!eoinfo->file_sym_done
8688 && (eoinfo->second_pass ? eoinfo->flinfo->filesym_count == 1
8689 : eoinfo->flinfo->filesym_count > 1))
8691 /* Output a FILE symbol so that following locals are not associated
8692 with the wrong input file. */
8693 memset (&sym, 0, sizeof (sym));
8694 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
8695 sym.st_shndx = SHN_ABS;
8696 if (!elf_link_output_sym (eoinfo->flinfo, NULL, &sym,
8697 bfd_und_section_ptr, NULL))
8700 eoinfo->file_sym_done = TRUE;
8705 if (h->forced_local)
8709 bed = get_elf_backend_data (flinfo->output_bfd);
8711 if (h->root.type == bfd_link_hash_undefined)
8713 /* If we have an undefined symbol reference here then it must have
8714 come from a shared library that is being linked in. (Undefined
8715 references in regular files have already been handled unless
8716 they are in unreferenced sections which are removed by garbage
8718 bfd_boolean ignore_undef = FALSE;
8720 /* Some symbols may be special in that the fact that they're
8721 undefined can be safely ignored - let backend determine that. */
8722 if (bed->elf_backend_ignore_undef_symbol)
8723 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8725 /* If we are reporting errors for this situation then do so now. */
8728 && (!h->ref_regular || flinfo->info->gc_sections)
8729 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
8730 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8732 if (!(flinfo->info->callbacks->undefined_symbol
8733 (flinfo->info, h->root.root.string,
8734 h->ref_regular ? NULL : h->root.u.undef.abfd,
8736 (flinfo->info->unresolved_syms_in_shared_libs
8737 == RM_GENERATE_ERROR))))
8739 bfd_set_error (bfd_error_bad_value);
8740 eoinfo->failed = TRUE;
8746 /* We should also warn if a forced local symbol is referenced from
8747 shared libraries. */
8748 if (!flinfo->info->relocatable
8749 && flinfo->info->executable
8754 && h->ref_dynamic_nonweak
8755 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
8759 struct elf_link_hash_entry *hi = h;
8761 /* Check indirect symbol. */
8762 while (hi->root.type == bfd_link_hash_indirect)
8763 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
8765 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
8766 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
8767 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
8768 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
8770 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
8771 def_bfd = flinfo->output_bfd;
8772 if (hi->root.u.def.section != bfd_abs_section_ptr)
8773 def_bfd = hi->root.u.def.section->owner;
8774 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
8775 h->root.root.string);
8776 bfd_set_error (bfd_error_bad_value);
8777 eoinfo->failed = TRUE;
8781 /* We don't want to output symbols that have never been mentioned by
8782 a regular file, or that we have been told to strip. However, if
8783 h->indx is set to -2, the symbol is used by a reloc and we must
8787 else if ((h->def_dynamic
8789 || h->root.type == bfd_link_hash_new)
8793 else if (flinfo->info->strip == strip_all)
8795 else if (flinfo->info->strip == strip_some
8796 && bfd_hash_lookup (flinfo->info->keep_hash,
8797 h->root.root.string, FALSE, FALSE) == NULL)
8799 else if ((h->root.type == bfd_link_hash_defined
8800 || h->root.type == bfd_link_hash_defweak)
8801 && ((flinfo->info->strip_discarded
8802 && discarded_section (h->root.u.def.section))
8803 || (h->root.u.def.section->owner != NULL
8804 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
8806 else if ((h->root.type == bfd_link_hash_undefined
8807 || h->root.type == bfd_link_hash_undefweak)
8808 && h->root.u.undef.abfd != NULL
8809 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
8814 /* If we're stripping it, and it's not a dynamic symbol, there's
8815 nothing else to do unless it is a forced local symbol or a
8816 STT_GNU_IFUNC symbol. */
8819 && h->type != STT_GNU_IFUNC
8820 && !h->forced_local)
8824 sym.st_size = h->size;
8825 sym.st_other = h->other;
8826 if (h->forced_local)
8828 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8829 /* Turn off visibility on local symbol. */
8830 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8832 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
8833 else if (h->unique_global && h->def_regular)
8834 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8835 else if (h->root.type == bfd_link_hash_undefweak
8836 || h->root.type == bfd_link_hash_defweak)
8837 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8839 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8840 sym.st_target_internal = h->target_internal;
8842 switch (h->root.type)
8845 case bfd_link_hash_new:
8846 case bfd_link_hash_warning:
8850 case bfd_link_hash_undefined:
8851 case bfd_link_hash_undefweak:
8852 input_sec = bfd_und_section_ptr;
8853 sym.st_shndx = SHN_UNDEF;
8856 case bfd_link_hash_defined:
8857 case bfd_link_hash_defweak:
8859 input_sec = h->root.u.def.section;
8860 if (input_sec->output_section != NULL)
8862 if (eoinfo->localsyms && flinfo->filesym_count == 1)
8864 bfd_boolean second_pass_sym
8865 = (input_sec->owner == flinfo->output_bfd
8866 || input_sec->owner == NULL
8867 || (input_sec->flags & SEC_LINKER_CREATED) != 0
8868 || (input_sec->owner->flags & BFD_LINKER_CREATED) != 0);
8870 eoinfo->need_second_pass |= second_pass_sym;
8871 if (eoinfo->second_pass != second_pass_sym)
8876 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
8877 input_sec->output_section);
8878 if (sym.st_shndx == SHN_BAD)
8880 (*_bfd_error_handler)
8881 (_("%B: could not find output section %A for input section %A"),
8882 flinfo->output_bfd, input_sec->output_section, input_sec);
8883 bfd_set_error (bfd_error_nonrepresentable_section);
8884 eoinfo->failed = TRUE;
8888 /* ELF symbols in relocatable files are section relative,
8889 but in nonrelocatable files they are virtual
8891 sym.st_value = h->root.u.def.value + input_sec->output_offset;
8892 if (!flinfo->info->relocatable)
8894 sym.st_value += input_sec->output_section->vma;
8895 if (h->type == STT_TLS)
8897 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
8898 if (tls_sec != NULL)
8899 sym.st_value -= tls_sec->vma;
8902 /* The TLS section may have been garbage collected. */
8903 BFD_ASSERT (flinfo->info->gc_sections
8904 && !input_sec->gc_mark);
8911 BFD_ASSERT (input_sec->owner == NULL
8912 || (input_sec->owner->flags & DYNAMIC) != 0);
8913 sym.st_shndx = SHN_UNDEF;
8914 input_sec = bfd_und_section_ptr;
8919 case bfd_link_hash_common:
8920 input_sec = h->root.u.c.p->section;
8921 sym.st_shndx = bed->common_section_index (input_sec);
8922 sym.st_value = 1 << h->root.u.c.p->alignment_power;
8925 case bfd_link_hash_indirect:
8926 /* These symbols are created by symbol versioning. They point
8927 to the decorated version of the name. For example, if the
8928 symbol foo@@GNU_1.2 is the default, which should be used when
8929 foo is used with no version, then we add an indirect symbol
8930 foo which points to foo@@GNU_1.2. We ignore these symbols,
8931 since the indirected symbol is already in the hash table. */
8935 /* Give the processor backend a chance to tweak the symbol value,
8936 and also to finish up anything that needs to be done for this
8937 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8938 forced local syms when non-shared is due to a historical quirk.
8939 STT_GNU_IFUNC symbol must go through PLT. */
8940 if ((h->type == STT_GNU_IFUNC
8942 && !flinfo->info->relocatable)
8943 || ((h->dynindx != -1
8945 && ((flinfo->info->shared
8946 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
8947 || h->root.type != bfd_link_hash_undefweak))
8948 || !h->forced_local)
8949 && elf_hash_table (flinfo->info)->dynamic_sections_created))
8951 if (! ((*bed->elf_backend_finish_dynamic_symbol)
8952 (flinfo->output_bfd, flinfo->info, h, &sym)))
8954 eoinfo->failed = TRUE;
8959 /* If we are marking the symbol as undefined, and there are no
8960 non-weak references to this symbol from a regular object, then
8961 mark the symbol as weak undefined; if there are non-weak
8962 references, mark the symbol as strong. We can't do this earlier,
8963 because it might not be marked as undefined until the
8964 finish_dynamic_symbol routine gets through with it. */
8965 if (sym.st_shndx == SHN_UNDEF
8967 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
8968 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
8971 unsigned int type = ELF_ST_TYPE (sym.st_info);
8973 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8974 if (type == STT_GNU_IFUNC)
8977 if (h->ref_regular_nonweak)
8978 bindtype = STB_GLOBAL;
8980 bindtype = STB_WEAK;
8981 sym.st_info = ELF_ST_INFO (bindtype, type);
8984 /* If this is a symbol defined in a dynamic library, don't use the
8985 symbol size from the dynamic library. Relinking an executable
8986 against a new library may introduce gratuitous changes in the
8987 executable's symbols if we keep the size. */
8988 if (sym.st_shndx == SHN_UNDEF
8993 /* If a non-weak symbol with non-default visibility is not defined
8994 locally, it is a fatal error. */
8995 if (!flinfo->info->relocatable
8996 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
8997 && ELF_ST_BIND (sym.st_info) != STB_WEAK
8998 && h->root.type == bfd_link_hash_undefined
9003 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
9004 msg = _("%B: protected symbol `%s' isn't defined");
9005 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
9006 msg = _("%B: internal symbol `%s' isn't defined");
9008 msg = _("%B: hidden symbol `%s' isn't defined");
9009 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
9010 bfd_set_error (bfd_error_bad_value);
9011 eoinfo->failed = TRUE;
9015 /* If this symbol should be put in the .dynsym section, then put it
9016 there now. We already know the symbol index. We also fill in
9017 the entry in the .hash section. */
9018 if (flinfo->dynsym_sec != NULL
9020 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9024 /* Since there is no version information in the dynamic string,
9025 if there is no version info in symbol version section, we will
9026 have a run-time problem. */
9027 if (h->verinfo.verdef == NULL)
9029 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9031 if (p && p [1] != '\0')
9033 (*_bfd_error_handler)
9034 (_("%B: No symbol version section for versioned symbol `%s'"),
9035 flinfo->output_bfd, h->root.root.string);
9036 eoinfo->failed = TRUE;
9041 sym.st_name = h->dynstr_index;
9042 esym = flinfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
9043 if (!check_dynsym (flinfo->output_bfd, &sym))
9045 eoinfo->failed = TRUE;
9048 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9050 if (flinfo->hash_sec != NULL)
9052 size_t hash_entry_size;
9053 bfd_byte *bucketpos;
9058 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9059 bucket = h->u.elf_hash_value % bucketcount;
9062 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9063 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9064 + (bucket + 2) * hash_entry_size);
9065 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9066 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9068 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9069 ((bfd_byte *) flinfo->hash_sec->contents
9070 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9073 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9075 Elf_Internal_Versym iversym;
9076 Elf_External_Versym *eversym;
9078 if (!h->def_regular)
9080 if (h->verinfo.verdef == NULL)
9081 iversym.vs_vers = 0;
9083 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9087 if (h->verinfo.vertree == NULL)
9088 iversym.vs_vers = 1;
9090 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9091 if (flinfo->info->create_default_symver)
9096 iversym.vs_vers |= VERSYM_HIDDEN;
9098 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9099 eversym += h->dynindx;
9100 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9104 /* If we're stripping it, then it was just a dynamic symbol, and
9105 there's nothing else to do. */
9106 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
9109 indx = bfd_get_symcount (flinfo->output_bfd);
9110 ret = elf_link_output_sym (flinfo, h->root.root.string, &sym, input_sec, h);
9113 eoinfo->failed = TRUE;
9118 else if (h->indx == -2)
9124 /* Return TRUE if special handling is done for relocs in SEC against
9125 symbols defined in discarded sections. */
9128 elf_section_ignore_discarded_relocs (asection *sec)
9130 const struct elf_backend_data *bed;
9132 switch (sec->sec_info_type)
9134 case SEC_INFO_TYPE_STABS:
9135 case SEC_INFO_TYPE_EH_FRAME:
9141 bed = get_elf_backend_data (sec->owner);
9142 if (bed->elf_backend_ignore_discarded_relocs != NULL
9143 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9149 /* Return a mask saying how ld should treat relocations in SEC against
9150 symbols defined in discarded sections. If this function returns
9151 COMPLAIN set, ld will issue a warning message. If this function
9152 returns PRETEND set, and the discarded section was link-once and the
9153 same size as the kept link-once section, ld will pretend that the
9154 symbol was actually defined in the kept section. Otherwise ld will
9155 zero the reloc (at least that is the intent, but some cooperation by
9156 the target dependent code is needed, particularly for REL targets). */
9159 _bfd_elf_default_action_discarded (asection *sec)
9161 if (sec->flags & SEC_DEBUGGING)
9164 if (strcmp (".eh_frame", sec->name) == 0)
9167 if (strcmp (".gcc_except_table", sec->name) == 0)
9170 return COMPLAIN | PRETEND;
9173 /* Find a match between a section and a member of a section group. */
9176 match_group_member (asection *sec, asection *group,
9177 struct bfd_link_info *info)
9179 asection *first = elf_next_in_group (group);
9180 asection *s = first;
9184 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9187 s = elf_next_in_group (s);
9195 /* Check if the kept section of a discarded section SEC can be used
9196 to replace it. Return the replacement if it is OK. Otherwise return
9200 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9204 kept = sec->kept_section;
9207 if ((kept->flags & SEC_GROUP) != 0)
9208 kept = match_group_member (sec, kept, info);
9210 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9211 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9213 sec->kept_section = kept;
9218 /* Link an input file into the linker output file. This function
9219 handles all the sections and relocations of the input file at once.
9220 This is so that we only have to read the local symbols once, and
9221 don't have to keep them in memory. */
9224 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9226 int (*relocate_section)
9227 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9228 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9230 Elf_Internal_Shdr *symtab_hdr;
9233 Elf_Internal_Sym *isymbuf;
9234 Elf_Internal_Sym *isym;
9235 Elf_Internal_Sym *isymend;
9237 asection **ppsection;
9239 const struct elf_backend_data *bed;
9240 struct elf_link_hash_entry **sym_hashes;
9241 bfd_size_type address_size;
9242 bfd_vma r_type_mask;
9244 bfd_boolean have_file_sym = FALSE;
9246 output_bfd = flinfo->output_bfd;
9247 bed = get_elf_backend_data (output_bfd);
9248 relocate_section = bed->elf_backend_relocate_section;
9250 /* If this is a dynamic object, we don't want to do anything here:
9251 we don't want the local symbols, and we don't want the section
9253 if ((input_bfd->flags & DYNAMIC) != 0)
9256 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9257 if (elf_bad_symtab (input_bfd))
9259 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9264 locsymcount = symtab_hdr->sh_info;
9265 extsymoff = symtab_hdr->sh_info;
9268 /* Read the local symbols. */
9269 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9270 if (isymbuf == NULL && locsymcount != 0)
9272 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9273 flinfo->internal_syms,
9274 flinfo->external_syms,
9275 flinfo->locsym_shndx);
9276 if (isymbuf == NULL)
9280 /* Find local symbol sections and adjust values of symbols in
9281 SEC_MERGE sections. Write out those local symbols we know are
9282 going into the output file. */
9283 isymend = isymbuf + locsymcount;
9284 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9286 isym++, pindex++, ppsection++)
9290 Elf_Internal_Sym osym;
9296 if (elf_bad_symtab (input_bfd))
9298 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9305 if (isym->st_shndx == SHN_UNDEF)
9306 isec = bfd_und_section_ptr;
9307 else if (isym->st_shndx == SHN_ABS)
9308 isec = bfd_abs_section_ptr;
9309 else if (isym->st_shndx == SHN_COMMON)
9310 isec = bfd_com_section_ptr;
9313 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9316 /* Don't attempt to output symbols with st_shnx in the
9317 reserved range other than SHN_ABS and SHN_COMMON. */
9321 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9322 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9324 _bfd_merged_section_offset (output_bfd, &isec,
9325 elf_section_data (isec)->sec_info,
9331 /* Don't output the first, undefined, symbol. */
9332 if (ppsection == flinfo->sections)
9335 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9337 /* We never output section symbols. Instead, we use the
9338 section symbol of the corresponding section in the output
9343 /* If we are stripping all symbols, we don't want to output this
9345 if (flinfo->info->strip == strip_all)
9348 /* If we are discarding all local symbols, we don't want to
9349 output this one. If we are generating a relocatable output
9350 file, then some of the local symbols may be required by
9351 relocs; we output them below as we discover that they are
9353 if (flinfo->info->discard == discard_all)
9356 /* If this symbol is defined in a section which we are
9357 discarding, we don't need to keep it. */
9358 if (isym->st_shndx != SHN_UNDEF
9359 && isym->st_shndx < SHN_LORESERVE
9360 && bfd_section_removed_from_list (output_bfd,
9361 isec->output_section))
9364 /* Get the name of the symbol. */
9365 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9370 /* See if we are discarding symbols with this name. */
9371 if ((flinfo->info->strip == strip_some
9372 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9374 || (((flinfo->info->discard == discard_sec_merge
9375 && (isec->flags & SEC_MERGE) && !flinfo->info->relocatable)
9376 || flinfo->info->discard == discard_l)
9377 && bfd_is_local_label_name (input_bfd, name)))
9380 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9382 have_file_sym = TRUE;
9383 flinfo->filesym_count += 1;
9387 /* In the absence of debug info, bfd_find_nearest_line uses
9388 FILE symbols to determine the source file for local
9389 function symbols. Provide a FILE symbol here if input
9390 files lack such, so that their symbols won't be
9391 associated with a previous input file. It's not the
9392 source file, but the best we can do. */
9393 have_file_sym = TRUE;
9394 flinfo->filesym_count += 1;
9395 memset (&osym, 0, sizeof (osym));
9396 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9397 osym.st_shndx = SHN_ABS;
9398 if (!elf_link_output_sym (flinfo, input_bfd->filename, &osym,
9399 bfd_abs_section_ptr, NULL))
9405 /* Adjust the section index for the output file. */
9406 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9407 isec->output_section);
9408 if (osym.st_shndx == SHN_BAD)
9411 /* ELF symbols in relocatable files are section relative, but
9412 in executable files they are virtual addresses. Note that
9413 this code assumes that all ELF sections have an associated
9414 BFD section with a reasonable value for output_offset; below
9415 we assume that they also have a reasonable value for
9416 output_section. Any special sections must be set up to meet
9417 these requirements. */
9418 osym.st_value += isec->output_offset;
9419 if (!flinfo->info->relocatable)
9421 osym.st_value += isec->output_section->vma;
9422 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9424 /* STT_TLS symbols are relative to PT_TLS segment base. */
9425 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9426 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9430 indx = bfd_get_symcount (output_bfd);
9431 ret = elf_link_output_sym (flinfo, name, &osym, isec, NULL);
9438 if (bed->s->arch_size == 32)
9446 r_type_mask = 0xffffffff;
9451 /* Relocate the contents of each section. */
9452 sym_hashes = elf_sym_hashes (input_bfd);
9453 for (o = input_bfd->sections; o != NULL; o = o->next)
9457 if (! o->linker_mark)
9459 /* This section was omitted from the link. */
9463 if (flinfo->info->relocatable
9464 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9466 /* Deal with the group signature symbol. */
9467 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9468 unsigned long symndx = sec_data->this_hdr.sh_info;
9469 asection *osec = o->output_section;
9471 if (symndx >= locsymcount
9472 || (elf_bad_symtab (input_bfd)
9473 && flinfo->sections[symndx] == NULL))
9475 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9476 while (h->root.type == bfd_link_hash_indirect
9477 || h->root.type == bfd_link_hash_warning)
9478 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9479 /* Arrange for symbol to be output. */
9481 elf_section_data (osec)->this_hdr.sh_info = -2;
9483 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9485 /* We'll use the output section target_index. */
9486 asection *sec = flinfo->sections[symndx]->output_section;
9487 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9491 if (flinfo->indices[symndx] == -1)
9493 /* Otherwise output the local symbol now. */
9494 Elf_Internal_Sym sym = isymbuf[symndx];
9495 asection *sec = flinfo->sections[symndx]->output_section;
9500 name = bfd_elf_string_from_elf_section (input_bfd,
9501 symtab_hdr->sh_link,
9506 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9508 if (sym.st_shndx == SHN_BAD)
9511 sym.st_value += o->output_offset;
9513 indx = bfd_get_symcount (output_bfd);
9514 ret = elf_link_output_sym (flinfo, name, &sym, o, NULL);
9518 flinfo->indices[symndx] = indx;
9522 elf_section_data (osec)->this_hdr.sh_info
9523 = flinfo->indices[symndx];
9527 if ((o->flags & SEC_HAS_CONTENTS) == 0
9528 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9531 if ((o->flags & SEC_LINKER_CREATED) != 0)
9533 /* Section was created by _bfd_elf_link_create_dynamic_sections
9538 /* Get the contents of the section. They have been cached by a
9539 relaxation routine. Note that o is a section in an input
9540 file, so the contents field will not have been set by any of
9541 the routines which work on output files. */
9542 if (elf_section_data (o)->this_hdr.contents != NULL)
9544 contents = elf_section_data (o)->this_hdr.contents;
9545 if (bed->caches_rawsize
9547 && o->rawsize < o->size)
9549 memcpy (flinfo->contents, contents, o->rawsize);
9550 contents = flinfo->contents;
9555 contents = flinfo->contents;
9556 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9560 if ((o->flags & SEC_RELOC) != 0)
9562 Elf_Internal_Rela *internal_relocs;
9563 Elf_Internal_Rela *rel, *relend;
9564 int action_discarded;
9567 /* Get the swapped relocs. */
9569 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
9570 flinfo->internal_relocs, FALSE);
9571 if (internal_relocs == NULL
9572 && o->reloc_count > 0)
9575 /* We need to reverse-copy input .ctors/.dtors sections if
9576 they are placed in .init_array/.finit_array for output. */
9577 if (o->size > address_size
9578 && ((strncmp (o->name, ".ctors", 6) == 0
9579 && strcmp (o->output_section->name,
9580 ".init_array") == 0)
9581 || (strncmp (o->name, ".dtors", 6) == 0
9582 && strcmp (o->output_section->name,
9583 ".fini_array") == 0))
9584 && (o->name[6] == 0 || o->name[6] == '.'))
9586 if (o->size != o->reloc_count * address_size)
9588 (*_bfd_error_handler)
9589 (_("error: %B: size of section %A is not "
9590 "multiple of address size"),
9592 bfd_set_error (bfd_error_on_input);
9595 o->flags |= SEC_ELF_REVERSE_COPY;
9598 action_discarded = -1;
9599 if (!elf_section_ignore_discarded_relocs (o))
9600 action_discarded = (*bed->action_discarded) (o);
9602 /* Run through the relocs evaluating complex reloc symbols and
9603 looking for relocs against symbols from discarded sections
9604 or section symbols from removed link-once sections.
9605 Complain about relocs against discarded sections. Zero
9606 relocs against removed link-once sections. */
9608 rel = internal_relocs;
9609 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9610 for ( ; rel < relend; rel++)
9612 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9613 unsigned int s_type;
9614 asection **ps, *sec;
9615 struct elf_link_hash_entry *h = NULL;
9616 const char *sym_name;
9618 if (r_symndx == STN_UNDEF)
9621 if (r_symndx >= locsymcount
9622 || (elf_bad_symtab (input_bfd)
9623 && flinfo->sections[r_symndx] == NULL))
9625 h = sym_hashes[r_symndx - extsymoff];
9627 /* Badly formatted input files can contain relocs that
9628 reference non-existant symbols. Check here so that
9629 we do not seg fault. */
9634 sprintf_vma (buffer, rel->r_info);
9635 (*_bfd_error_handler)
9636 (_("error: %B contains a reloc (0x%s) for section %A "
9637 "that references a non-existent global symbol"),
9638 input_bfd, o, buffer);
9639 bfd_set_error (bfd_error_bad_value);
9643 while (h->root.type == bfd_link_hash_indirect
9644 || h->root.type == bfd_link_hash_warning)
9645 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9650 if (h->root.type == bfd_link_hash_defined
9651 || h->root.type == bfd_link_hash_defweak)
9652 ps = &h->root.u.def.section;
9654 sym_name = h->root.root.string;
9658 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9660 s_type = ELF_ST_TYPE (sym->st_info);
9661 ps = &flinfo->sections[r_symndx];
9662 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9666 if ((s_type == STT_RELC || s_type == STT_SRELC)
9667 && !flinfo->info->relocatable)
9670 bfd_vma dot = (rel->r_offset
9671 + o->output_offset + o->output_section->vma);
9673 printf ("Encountered a complex symbol!");
9674 printf (" (input_bfd %s, section %s, reloc %ld\n",
9675 input_bfd->filename, o->name,
9676 (long) (rel - internal_relocs));
9677 printf (" symbol: idx %8.8lx, name %s\n",
9678 r_symndx, sym_name);
9679 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9680 (unsigned long) rel->r_info,
9681 (unsigned long) rel->r_offset);
9683 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
9684 isymbuf, locsymcount, s_type == STT_SRELC))
9687 /* Symbol evaluated OK. Update to absolute value. */
9688 set_symbol_value (input_bfd, isymbuf, locsymcount,
9693 if (action_discarded != -1 && ps != NULL)
9695 /* Complain if the definition comes from a
9696 discarded section. */
9697 if ((sec = *ps) != NULL && discarded_section (sec))
9699 BFD_ASSERT (r_symndx != STN_UNDEF);
9700 if (action_discarded & COMPLAIN)
9701 (*flinfo->info->callbacks->einfo)
9702 (_("%X`%s' referenced in section `%A' of %B: "
9703 "defined in discarded section `%A' of %B\n"),
9704 sym_name, o, input_bfd, sec, sec->owner);
9706 /* Try to do the best we can to support buggy old
9707 versions of gcc. Pretend that the symbol is
9708 really defined in the kept linkonce section.
9709 FIXME: This is quite broken. Modifying the
9710 symbol here means we will be changing all later
9711 uses of the symbol, not just in this section. */
9712 if (action_discarded & PRETEND)
9716 kept = _bfd_elf_check_kept_section (sec,
9728 /* Relocate the section by invoking a back end routine.
9730 The back end routine is responsible for adjusting the
9731 section contents as necessary, and (if using Rela relocs
9732 and generating a relocatable output file) adjusting the
9733 reloc addend as necessary.
9735 The back end routine does not have to worry about setting
9736 the reloc address or the reloc symbol index.
9738 The back end routine is given a pointer to the swapped in
9739 internal symbols, and can access the hash table entries
9740 for the external symbols via elf_sym_hashes (input_bfd).
9742 When generating relocatable output, the back end routine
9743 must handle STB_LOCAL/STT_SECTION symbols specially. The
9744 output symbol is going to be a section symbol
9745 corresponding to the output section, which will require
9746 the addend to be adjusted. */
9748 ret = (*relocate_section) (output_bfd, flinfo->info,
9749 input_bfd, o, contents,
9757 || flinfo->info->relocatable
9758 || flinfo->info->emitrelocations)
9760 Elf_Internal_Rela *irela;
9761 Elf_Internal_Rela *irelaend, *irelamid;
9762 bfd_vma last_offset;
9763 struct elf_link_hash_entry **rel_hash;
9764 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
9765 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
9766 unsigned int next_erel;
9767 bfd_boolean rela_normal;
9768 struct bfd_elf_section_data *esdi, *esdo;
9770 esdi = elf_section_data (o);
9771 esdo = elf_section_data (o->output_section);
9772 rela_normal = FALSE;
9774 /* Adjust the reloc addresses and symbol indices. */
9776 irela = internal_relocs;
9777 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9778 rel_hash = esdo->rel.hashes + esdo->rel.count;
9779 /* We start processing the REL relocs, if any. When we reach
9780 IRELAMID in the loop, we switch to the RELA relocs. */
9782 if (esdi->rel.hdr != NULL)
9783 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
9784 * bed->s->int_rels_per_ext_rel);
9785 rel_hash_list = rel_hash;
9786 rela_hash_list = NULL;
9787 last_offset = o->output_offset;
9788 if (!flinfo->info->relocatable)
9789 last_offset += o->output_section->vma;
9790 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9792 unsigned long r_symndx;
9794 Elf_Internal_Sym sym;
9796 if (next_erel == bed->s->int_rels_per_ext_rel)
9802 if (irela == irelamid)
9804 rel_hash = esdo->rela.hashes + esdo->rela.count;
9805 rela_hash_list = rel_hash;
9806 rela_normal = bed->rela_normal;
9809 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9812 if (irela->r_offset >= (bfd_vma) -2)
9814 /* This is a reloc for a deleted entry or somesuch.
9815 Turn it into an R_*_NONE reloc, at the same
9816 offset as the last reloc. elf_eh_frame.c and
9817 bfd_elf_discard_info rely on reloc offsets
9819 irela->r_offset = last_offset;
9821 irela->r_addend = 0;
9825 irela->r_offset += o->output_offset;
9827 /* Relocs in an executable have to be virtual addresses. */
9828 if (!flinfo->info->relocatable)
9829 irela->r_offset += o->output_section->vma;
9831 last_offset = irela->r_offset;
9833 r_symndx = irela->r_info >> r_sym_shift;
9834 if (r_symndx == STN_UNDEF)
9837 if (r_symndx >= locsymcount
9838 || (elf_bad_symtab (input_bfd)
9839 && flinfo->sections[r_symndx] == NULL))
9841 struct elf_link_hash_entry *rh;
9844 /* This is a reloc against a global symbol. We
9845 have not yet output all the local symbols, so
9846 we do not know the symbol index of any global
9847 symbol. We set the rel_hash entry for this
9848 reloc to point to the global hash table entry
9849 for this symbol. The symbol index is then
9850 set at the end of bfd_elf_final_link. */
9851 indx = r_symndx - extsymoff;
9852 rh = elf_sym_hashes (input_bfd)[indx];
9853 while (rh->root.type == bfd_link_hash_indirect
9854 || rh->root.type == bfd_link_hash_warning)
9855 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
9857 /* Setting the index to -2 tells
9858 elf_link_output_extsym that this symbol is
9860 BFD_ASSERT (rh->indx < 0);
9868 /* This is a reloc against a local symbol. */
9871 sym = isymbuf[r_symndx];
9872 sec = flinfo->sections[r_symndx];
9873 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
9875 /* I suppose the backend ought to fill in the
9876 section of any STT_SECTION symbol against a
9877 processor specific section. */
9878 r_symndx = STN_UNDEF;
9879 if (bfd_is_abs_section (sec))
9881 else if (sec == NULL || sec->owner == NULL)
9883 bfd_set_error (bfd_error_bad_value);
9888 asection *osec = sec->output_section;
9890 /* If we have discarded a section, the output
9891 section will be the absolute section. In
9892 case of discarded SEC_MERGE sections, use
9893 the kept section. relocate_section should
9894 have already handled discarded linkonce
9896 if (bfd_is_abs_section (osec)
9897 && sec->kept_section != NULL
9898 && sec->kept_section->output_section != NULL)
9900 osec = sec->kept_section->output_section;
9901 irela->r_addend -= osec->vma;
9904 if (!bfd_is_abs_section (osec))
9906 r_symndx = osec->target_index;
9907 if (r_symndx == STN_UNDEF)
9909 irela->r_addend += osec->vma;
9910 osec = _bfd_nearby_section (output_bfd, osec,
9912 irela->r_addend -= osec->vma;
9913 r_symndx = osec->target_index;
9918 /* Adjust the addend according to where the
9919 section winds up in the output section. */
9921 irela->r_addend += sec->output_offset;
9925 if (flinfo->indices[r_symndx] == -1)
9927 unsigned long shlink;
9932 if (flinfo->info->strip == strip_all)
9934 /* You can't do ld -r -s. */
9935 bfd_set_error (bfd_error_invalid_operation);
9939 /* This symbol was skipped earlier, but
9940 since it is needed by a reloc, we
9941 must output it now. */
9942 shlink = symtab_hdr->sh_link;
9943 name = (bfd_elf_string_from_elf_section
9944 (input_bfd, shlink, sym.st_name));
9948 osec = sec->output_section;
9950 _bfd_elf_section_from_bfd_section (output_bfd,
9952 if (sym.st_shndx == SHN_BAD)
9955 sym.st_value += sec->output_offset;
9956 if (!flinfo->info->relocatable)
9958 sym.st_value += osec->vma;
9959 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
9961 /* STT_TLS symbols are relative to PT_TLS
9963 BFD_ASSERT (elf_hash_table (flinfo->info)
9965 sym.st_value -= (elf_hash_table (flinfo->info)
9970 indx = bfd_get_symcount (output_bfd);
9971 ret = elf_link_output_sym (flinfo, name, &sym, sec,
9976 flinfo->indices[r_symndx] = indx;
9981 r_symndx = flinfo->indices[r_symndx];
9984 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
9985 | (irela->r_info & r_type_mask));
9988 /* Swap out the relocs. */
9989 input_rel_hdr = esdi->rel.hdr;
9990 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
9992 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9997 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
9998 * bed->s->int_rels_per_ext_rel);
9999 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
10002 input_rela_hdr = esdi->rela.hdr;
10003 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
10005 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10014 /* Write out the modified section contents. */
10015 if (bed->elf_backend_write_section
10016 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
10019 /* Section written out. */
10021 else switch (o->sec_info_type)
10023 case SEC_INFO_TYPE_STABS:
10024 if (! (_bfd_write_section_stabs
10026 &elf_hash_table (flinfo->info)->stab_info,
10027 o, &elf_section_data (o)->sec_info, contents)))
10030 case SEC_INFO_TYPE_MERGE:
10031 if (! _bfd_write_merged_section (output_bfd, o,
10032 elf_section_data (o)->sec_info))
10035 case SEC_INFO_TYPE_EH_FRAME:
10037 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10044 /* FIXME: octets_per_byte. */
10045 if (! (o->flags & SEC_EXCLUDE))
10047 file_ptr offset = (file_ptr) o->output_offset;
10048 bfd_size_type todo = o->size;
10049 if ((o->flags & SEC_ELF_REVERSE_COPY))
10051 /* Reverse-copy input section to output. */
10054 todo -= address_size;
10055 if (! bfd_set_section_contents (output_bfd,
10063 offset += address_size;
10067 else if (! bfd_set_section_contents (output_bfd,
10081 /* Generate a reloc when linking an ELF file. This is a reloc
10082 requested by the linker, and does not come from any input file. This
10083 is used to build constructor and destructor tables when linking
10087 elf_reloc_link_order (bfd *output_bfd,
10088 struct bfd_link_info *info,
10089 asection *output_section,
10090 struct bfd_link_order *link_order)
10092 reloc_howto_type *howto;
10096 struct bfd_elf_section_reloc_data *reldata;
10097 struct elf_link_hash_entry **rel_hash_ptr;
10098 Elf_Internal_Shdr *rel_hdr;
10099 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10100 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10103 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10105 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10108 bfd_set_error (bfd_error_bad_value);
10112 addend = link_order->u.reloc.p->addend;
10115 reldata = &esdo->rel;
10116 else if (esdo->rela.hdr)
10117 reldata = &esdo->rela;
10124 /* Figure out the symbol index. */
10125 rel_hash_ptr = reldata->hashes + reldata->count;
10126 if (link_order->type == bfd_section_reloc_link_order)
10128 indx = link_order->u.reloc.p->u.section->target_index;
10129 BFD_ASSERT (indx != 0);
10130 *rel_hash_ptr = NULL;
10134 struct elf_link_hash_entry *h;
10136 /* Treat a reloc against a defined symbol as though it were
10137 actually against the section. */
10138 h = ((struct elf_link_hash_entry *)
10139 bfd_wrapped_link_hash_lookup (output_bfd, info,
10140 link_order->u.reloc.p->u.name,
10141 FALSE, FALSE, TRUE));
10143 && (h->root.type == bfd_link_hash_defined
10144 || h->root.type == bfd_link_hash_defweak))
10148 section = h->root.u.def.section;
10149 indx = section->output_section->target_index;
10150 *rel_hash_ptr = NULL;
10151 /* It seems that we ought to add the symbol value to the
10152 addend here, but in practice it has already been added
10153 because it was passed to constructor_callback. */
10154 addend += section->output_section->vma + section->output_offset;
10156 else if (h != NULL)
10158 /* Setting the index to -2 tells elf_link_output_extsym that
10159 this symbol is used by a reloc. */
10166 if (! ((*info->callbacks->unattached_reloc)
10167 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10173 /* If this is an inplace reloc, we must write the addend into the
10175 if (howto->partial_inplace && addend != 0)
10177 bfd_size_type size;
10178 bfd_reloc_status_type rstat;
10181 const char *sym_name;
10183 size = (bfd_size_type) bfd_get_reloc_size (howto);
10184 buf = (bfd_byte *) bfd_zmalloc (size);
10187 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10194 case bfd_reloc_outofrange:
10197 case bfd_reloc_overflow:
10198 if (link_order->type == bfd_section_reloc_link_order)
10199 sym_name = bfd_section_name (output_bfd,
10200 link_order->u.reloc.p->u.section);
10202 sym_name = link_order->u.reloc.p->u.name;
10203 if (! ((*info->callbacks->reloc_overflow)
10204 (info, NULL, sym_name, howto->name, addend, NULL,
10205 NULL, (bfd_vma) 0)))
10212 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10213 link_order->offset, size);
10219 /* The address of a reloc is relative to the section in a
10220 relocatable file, and is a virtual address in an executable
10222 offset = link_order->offset;
10223 if (! info->relocatable)
10224 offset += output_section->vma;
10226 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10228 irel[i].r_offset = offset;
10229 irel[i].r_info = 0;
10230 irel[i].r_addend = 0;
10232 if (bed->s->arch_size == 32)
10233 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10235 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10237 rel_hdr = reldata->hdr;
10238 erel = rel_hdr->contents;
10239 if (rel_hdr->sh_type == SHT_REL)
10241 erel += reldata->count * bed->s->sizeof_rel;
10242 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10246 irel[0].r_addend = addend;
10247 erel += reldata->count * bed->s->sizeof_rela;
10248 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10257 /* Get the output vma of the section pointed to by the sh_link field. */
10260 elf_get_linked_section_vma (struct bfd_link_order *p)
10262 Elf_Internal_Shdr **elf_shdrp;
10266 s = p->u.indirect.section;
10267 elf_shdrp = elf_elfsections (s->owner);
10268 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10269 elfsec = elf_shdrp[elfsec]->sh_link;
10271 The Intel C compiler generates SHT_IA_64_UNWIND with
10272 SHF_LINK_ORDER. But it doesn't set the sh_link or
10273 sh_info fields. Hence we could get the situation
10274 where elfsec is 0. */
10277 const struct elf_backend_data *bed
10278 = get_elf_backend_data (s->owner);
10279 if (bed->link_order_error_handler)
10280 bed->link_order_error_handler
10281 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10286 s = elf_shdrp[elfsec]->bfd_section;
10287 return s->output_section->vma + s->output_offset;
10292 /* Compare two sections based on the locations of the sections they are
10293 linked to. Used by elf_fixup_link_order. */
10296 compare_link_order (const void * a, const void * b)
10301 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10302 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10305 return apos > bpos;
10309 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10310 order as their linked sections. Returns false if this could not be done
10311 because an output section includes both ordered and unordered
10312 sections. Ideally we'd do this in the linker proper. */
10315 elf_fixup_link_order (bfd *abfd, asection *o)
10317 int seen_linkorder;
10320 struct bfd_link_order *p;
10322 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10324 struct bfd_link_order **sections;
10325 asection *s, *other_sec, *linkorder_sec;
10329 linkorder_sec = NULL;
10331 seen_linkorder = 0;
10332 for (p = o->map_head.link_order; p != NULL; p = p->next)
10334 if (p->type == bfd_indirect_link_order)
10336 s = p->u.indirect.section;
10338 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10339 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10340 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10341 && elfsec < elf_numsections (sub)
10342 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10343 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10357 if (seen_other && seen_linkorder)
10359 if (other_sec && linkorder_sec)
10360 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10362 linkorder_sec->owner, other_sec,
10365 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10367 bfd_set_error (bfd_error_bad_value);
10372 if (!seen_linkorder)
10375 sections = (struct bfd_link_order **)
10376 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10377 if (sections == NULL)
10379 seen_linkorder = 0;
10381 for (p = o->map_head.link_order; p != NULL; p = p->next)
10383 sections[seen_linkorder++] = p;
10385 /* Sort the input sections in the order of their linked section. */
10386 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10387 compare_link_order);
10389 /* Change the offsets of the sections. */
10391 for (n = 0; n < seen_linkorder; n++)
10393 s = sections[n]->u.indirect.section;
10394 offset &= ~(bfd_vma) 0 << s->alignment_power;
10395 s->output_offset = offset;
10396 sections[n]->offset = offset;
10397 /* FIXME: octets_per_byte. */
10398 offset += sections[n]->size;
10406 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10410 if (flinfo->symstrtab != NULL)
10411 _bfd_stringtab_free (flinfo->symstrtab);
10412 if (flinfo->contents != NULL)
10413 free (flinfo->contents);
10414 if (flinfo->external_relocs != NULL)
10415 free (flinfo->external_relocs);
10416 if (flinfo->internal_relocs != NULL)
10417 free (flinfo->internal_relocs);
10418 if (flinfo->external_syms != NULL)
10419 free (flinfo->external_syms);
10420 if (flinfo->locsym_shndx != NULL)
10421 free (flinfo->locsym_shndx);
10422 if (flinfo->internal_syms != NULL)
10423 free (flinfo->internal_syms);
10424 if (flinfo->indices != NULL)
10425 free (flinfo->indices);
10426 if (flinfo->sections != NULL)
10427 free (flinfo->sections);
10428 if (flinfo->symbuf != NULL)
10429 free (flinfo->symbuf);
10430 if (flinfo->symshndxbuf != NULL)
10431 free (flinfo->symshndxbuf);
10432 for (o = obfd->sections; o != NULL; o = o->next)
10434 struct bfd_elf_section_data *esdo = elf_section_data (o);
10435 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10436 free (esdo->rel.hashes);
10437 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10438 free (esdo->rela.hashes);
10442 /* Do the final step of an ELF link. */
10445 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10447 bfd_boolean dynamic;
10448 bfd_boolean emit_relocs;
10450 struct elf_final_link_info flinfo;
10452 struct bfd_link_order *p;
10454 bfd_size_type max_contents_size;
10455 bfd_size_type max_external_reloc_size;
10456 bfd_size_type max_internal_reloc_count;
10457 bfd_size_type max_sym_count;
10458 bfd_size_type max_sym_shndx_count;
10460 Elf_Internal_Sym elfsym;
10462 Elf_Internal_Shdr *symtab_hdr;
10463 Elf_Internal_Shdr *symtab_shndx_hdr;
10464 Elf_Internal_Shdr *symstrtab_hdr;
10465 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10466 struct elf_outext_info eoinfo;
10467 bfd_boolean merged;
10468 size_t relativecount = 0;
10469 asection *reldyn = 0;
10471 asection *attr_section = NULL;
10472 bfd_vma attr_size = 0;
10473 const char *std_attrs_section;
10475 if (! is_elf_hash_table (info->hash))
10479 abfd->flags |= DYNAMIC;
10481 dynamic = elf_hash_table (info)->dynamic_sections_created;
10482 dynobj = elf_hash_table (info)->dynobj;
10484 emit_relocs = (info->relocatable
10485 || info->emitrelocations);
10487 flinfo.info = info;
10488 flinfo.output_bfd = abfd;
10489 flinfo.symstrtab = _bfd_elf_stringtab_init ();
10490 if (flinfo.symstrtab == NULL)
10495 flinfo.dynsym_sec = NULL;
10496 flinfo.hash_sec = NULL;
10497 flinfo.symver_sec = NULL;
10501 flinfo.dynsym_sec = bfd_get_linker_section (dynobj, ".dynsym");
10502 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
10503 /* Note that dynsym_sec can be NULL (on VMS). */
10504 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
10505 /* Note that it is OK if symver_sec is NULL. */
10508 flinfo.contents = NULL;
10509 flinfo.external_relocs = NULL;
10510 flinfo.internal_relocs = NULL;
10511 flinfo.external_syms = NULL;
10512 flinfo.locsym_shndx = NULL;
10513 flinfo.internal_syms = NULL;
10514 flinfo.indices = NULL;
10515 flinfo.sections = NULL;
10516 flinfo.symbuf = NULL;
10517 flinfo.symshndxbuf = NULL;
10518 flinfo.symbuf_count = 0;
10519 flinfo.shndxbuf_size = 0;
10520 flinfo.filesym_count = 0;
10522 /* The object attributes have been merged. Remove the input
10523 sections from the link, and set the contents of the output
10525 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10526 for (o = abfd->sections; o != NULL; o = o->next)
10528 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10529 || strcmp (o->name, ".gnu.attributes") == 0)
10531 for (p = o->map_head.link_order; p != NULL; p = p->next)
10533 asection *input_section;
10535 if (p->type != bfd_indirect_link_order)
10537 input_section = p->u.indirect.section;
10538 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10539 elf_link_input_bfd ignores this section. */
10540 input_section->flags &= ~SEC_HAS_CONTENTS;
10543 attr_size = bfd_elf_obj_attr_size (abfd);
10546 bfd_set_section_size (abfd, o, attr_size);
10548 /* Skip this section later on. */
10549 o->map_head.link_order = NULL;
10552 o->flags |= SEC_EXCLUDE;
10556 /* Count up the number of relocations we will output for each output
10557 section, so that we know the sizes of the reloc sections. We
10558 also figure out some maximum sizes. */
10559 max_contents_size = 0;
10560 max_external_reloc_size = 0;
10561 max_internal_reloc_count = 0;
10563 max_sym_shndx_count = 0;
10565 for (o = abfd->sections; o != NULL; o = o->next)
10567 struct bfd_elf_section_data *esdo = elf_section_data (o);
10568 o->reloc_count = 0;
10570 for (p = o->map_head.link_order; p != NULL; p = p->next)
10572 unsigned int reloc_count = 0;
10573 struct bfd_elf_section_data *esdi = NULL;
10575 if (p->type == bfd_section_reloc_link_order
10576 || p->type == bfd_symbol_reloc_link_order)
10578 else if (p->type == bfd_indirect_link_order)
10582 sec = p->u.indirect.section;
10583 esdi = elf_section_data (sec);
10585 /* Mark all sections which are to be included in the
10586 link. This will normally be every section. We need
10587 to do this so that we can identify any sections which
10588 the linker has decided to not include. */
10589 sec->linker_mark = TRUE;
10591 if (sec->flags & SEC_MERGE)
10594 if (esdo->this_hdr.sh_type == SHT_REL
10595 || esdo->this_hdr.sh_type == SHT_RELA)
10596 /* Some backends use reloc_count in relocation sections
10597 to count particular types of relocs. Of course,
10598 reloc sections themselves can't have relocations. */
10600 else if (info->relocatable || info->emitrelocations)
10601 reloc_count = sec->reloc_count;
10602 else if (bed->elf_backend_count_relocs)
10603 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10605 if (sec->rawsize > max_contents_size)
10606 max_contents_size = sec->rawsize;
10607 if (sec->size > max_contents_size)
10608 max_contents_size = sec->size;
10610 /* We are interested in just local symbols, not all
10612 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10613 && (sec->owner->flags & DYNAMIC) == 0)
10617 if (elf_bad_symtab (sec->owner))
10618 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10619 / bed->s->sizeof_sym);
10621 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10623 if (sym_count > max_sym_count)
10624 max_sym_count = sym_count;
10626 if (sym_count > max_sym_shndx_count
10627 && elf_symtab_shndx (sec->owner) != 0)
10628 max_sym_shndx_count = sym_count;
10630 if ((sec->flags & SEC_RELOC) != 0)
10632 size_t ext_size = 0;
10634 if (esdi->rel.hdr != NULL)
10635 ext_size = esdi->rel.hdr->sh_size;
10636 if (esdi->rela.hdr != NULL)
10637 ext_size += esdi->rela.hdr->sh_size;
10639 if (ext_size > max_external_reloc_size)
10640 max_external_reloc_size = ext_size;
10641 if (sec->reloc_count > max_internal_reloc_count)
10642 max_internal_reloc_count = sec->reloc_count;
10647 if (reloc_count == 0)
10650 o->reloc_count += reloc_count;
10652 if (p->type == bfd_indirect_link_order
10653 && (info->relocatable || info->emitrelocations))
10656 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
10657 if (esdi->rela.hdr)
10658 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
10663 esdo->rela.count += reloc_count;
10665 esdo->rel.count += reloc_count;
10669 if (o->reloc_count > 0)
10670 o->flags |= SEC_RELOC;
10673 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10674 set it (this is probably a bug) and if it is set
10675 assign_section_numbers will create a reloc section. */
10676 o->flags &=~ SEC_RELOC;
10679 /* If the SEC_ALLOC flag is not set, force the section VMA to
10680 zero. This is done in elf_fake_sections as well, but forcing
10681 the VMA to 0 here will ensure that relocs against these
10682 sections are handled correctly. */
10683 if ((o->flags & SEC_ALLOC) == 0
10684 && ! o->user_set_vma)
10688 if (! info->relocatable && merged)
10689 elf_link_hash_traverse (elf_hash_table (info),
10690 _bfd_elf_link_sec_merge_syms, abfd);
10692 /* Figure out the file positions for everything but the symbol table
10693 and the relocs. We set symcount to force assign_section_numbers
10694 to create a symbol table. */
10695 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
10696 BFD_ASSERT (! abfd->output_has_begun);
10697 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10700 /* Set sizes, and assign file positions for reloc sections. */
10701 for (o = abfd->sections; o != NULL; o = o->next)
10703 struct bfd_elf_section_data *esdo = elf_section_data (o);
10704 if ((o->flags & SEC_RELOC) != 0)
10707 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
10711 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
10715 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10716 to count upwards while actually outputting the relocations. */
10717 esdo->rel.count = 0;
10718 esdo->rela.count = 0;
10721 _bfd_elf_assign_file_positions_for_relocs (abfd);
10723 /* We have now assigned file positions for all the sections except
10724 .symtab and .strtab. We start the .symtab section at the current
10725 file position, and write directly to it. We build the .strtab
10726 section in memory. */
10727 bfd_get_symcount (abfd) = 0;
10728 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10729 /* sh_name is set in prep_headers. */
10730 symtab_hdr->sh_type = SHT_SYMTAB;
10731 /* sh_flags, sh_addr and sh_size all start off zero. */
10732 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10733 /* sh_link is set in assign_section_numbers. */
10734 /* sh_info is set below. */
10735 /* sh_offset is set just below. */
10736 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10738 off = elf_next_file_pos (abfd);
10739 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10741 /* Note that at this point elf_next_file_pos (abfd) is
10742 incorrect. We do not yet know the size of the .symtab section.
10743 We correct next_file_pos below, after we do know the size. */
10745 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10746 continuously seeking to the right position in the file. */
10747 if (! info->keep_memory || max_sym_count < 20)
10748 flinfo.symbuf_size = 20;
10750 flinfo.symbuf_size = max_sym_count;
10751 amt = flinfo.symbuf_size;
10752 amt *= bed->s->sizeof_sym;
10753 flinfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10754 if (flinfo.symbuf == NULL)
10756 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10758 /* Wild guess at number of output symbols. realloc'd as needed. */
10759 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10760 flinfo.shndxbuf_size = amt;
10761 amt *= sizeof (Elf_External_Sym_Shndx);
10762 flinfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10763 if (flinfo.symshndxbuf == NULL)
10767 /* Start writing out the symbol table. The first symbol is always a
10769 if (info->strip != strip_all
10772 elfsym.st_value = 0;
10773 elfsym.st_size = 0;
10774 elfsym.st_info = 0;
10775 elfsym.st_other = 0;
10776 elfsym.st_shndx = SHN_UNDEF;
10777 elfsym.st_target_internal = 0;
10778 if (elf_link_output_sym (&flinfo, NULL, &elfsym, bfd_und_section_ptr,
10783 /* Output a symbol for each section. We output these even if we are
10784 discarding local symbols, since they are used for relocs. These
10785 symbols have no names. We store the index of each one in the
10786 index field of the section, so that we can find it again when
10787 outputting relocs. */
10788 if (info->strip != strip_all
10791 elfsym.st_size = 0;
10792 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10793 elfsym.st_other = 0;
10794 elfsym.st_value = 0;
10795 elfsym.st_target_internal = 0;
10796 for (i = 1; i < elf_numsections (abfd); i++)
10798 o = bfd_section_from_elf_index (abfd, i);
10801 o->target_index = bfd_get_symcount (abfd);
10802 elfsym.st_shndx = i;
10803 if (!info->relocatable)
10804 elfsym.st_value = o->vma;
10805 if (elf_link_output_sym (&flinfo, NULL, &elfsym, o, NULL) != 1)
10811 /* Allocate some memory to hold information read in from the input
10813 if (max_contents_size != 0)
10815 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10816 if (flinfo.contents == NULL)
10820 if (max_external_reloc_size != 0)
10822 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
10823 if (flinfo.external_relocs == NULL)
10827 if (max_internal_reloc_count != 0)
10829 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10830 amt *= sizeof (Elf_Internal_Rela);
10831 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10832 if (flinfo.internal_relocs == NULL)
10836 if (max_sym_count != 0)
10838 amt = max_sym_count * bed->s->sizeof_sym;
10839 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
10840 if (flinfo.external_syms == NULL)
10843 amt = max_sym_count * sizeof (Elf_Internal_Sym);
10844 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
10845 if (flinfo.internal_syms == NULL)
10848 amt = max_sym_count * sizeof (long);
10849 flinfo.indices = (long int *) bfd_malloc (amt);
10850 if (flinfo.indices == NULL)
10853 amt = max_sym_count * sizeof (asection *);
10854 flinfo.sections = (asection **) bfd_malloc (amt);
10855 if (flinfo.sections == NULL)
10859 if (max_sym_shndx_count != 0)
10861 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
10862 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
10863 if (flinfo.locsym_shndx == NULL)
10867 if (elf_hash_table (info)->tls_sec)
10869 bfd_vma base, end = 0;
10872 for (sec = elf_hash_table (info)->tls_sec;
10873 sec && (sec->flags & SEC_THREAD_LOCAL);
10876 bfd_size_type size = sec->size;
10879 && (sec->flags & SEC_HAS_CONTENTS) == 0)
10881 struct bfd_link_order *ord = sec->map_tail.link_order;
10884 size = ord->offset + ord->size;
10886 end = sec->vma + size;
10888 base = elf_hash_table (info)->tls_sec->vma;
10889 /* Only align end of TLS section if static TLS doesn't have special
10890 alignment requirements. */
10891 if (bed->static_tls_alignment == 1)
10892 end = align_power (end,
10893 elf_hash_table (info)->tls_sec->alignment_power);
10894 elf_hash_table (info)->tls_size = end - base;
10897 /* Reorder SHF_LINK_ORDER sections. */
10898 for (o = abfd->sections; o != NULL; o = o->next)
10900 if (!elf_fixup_link_order (abfd, o))
10904 /* Since ELF permits relocations to be against local symbols, we
10905 must have the local symbols available when we do the relocations.
10906 Since we would rather only read the local symbols once, and we
10907 would rather not keep them in memory, we handle all the
10908 relocations for a single input file at the same time.
10910 Unfortunately, there is no way to know the total number of local
10911 symbols until we have seen all of them, and the local symbol
10912 indices precede the global symbol indices. This means that when
10913 we are generating relocatable output, and we see a reloc against
10914 a global symbol, we can not know the symbol index until we have
10915 finished examining all the local symbols to see which ones we are
10916 going to output. To deal with this, we keep the relocations in
10917 memory, and don't output them until the end of the link. This is
10918 an unfortunate waste of memory, but I don't see a good way around
10919 it. Fortunately, it only happens when performing a relocatable
10920 link, which is not the common case. FIXME: If keep_memory is set
10921 we could write the relocs out and then read them again; I don't
10922 know how bad the memory loss will be. */
10924 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
10925 sub->output_has_begun = FALSE;
10926 for (o = abfd->sections; o != NULL; o = o->next)
10928 for (p = o->map_head.link_order; p != NULL; p = p->next)
10930 if (p->type == bfd_indirect_link_order
10931 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
10932 == bfd_target_elf_flavour)
10933 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
10935 if (! sub->output_has_begun)
10937 if (! elf_link_input_bfd (&flinfo, sub))
10939 sub->output_has_begun = TRUE;
10942 else if (p->type == bfd_section_reloc_link_order
10943 || p->type == bfd_symbol_reloc_link_order)
10945 if (! elf_reloc_link_order (abfd, info, o, p))
10950 if (! _bfd_default_link_order (abfd, info, o, p))
10952 if (p->type == bfd_indirect_link_order
10953 && (bfd_get_flavour (sub)
10954 == bfd_target_elf_flavour)
10955 && (elf_elfheader (sub)->e_ident[EI_CLASS]
10956 != bed->s->elfclass))
10958 const char *iclass, *oclass;
10960 if (bed->s->elfclass == ELFCLASS64)
10962 iclass = "ELFCLASS32";
10963 oclass = "ELFCLASS64";
10967 iclass = "ELFCLASS64";
10968 oclass = "ELFCLASS32";
10971 bfd_set_error (bfd_error_wrong_format);
10972 (*_bfd_error_handler)
10973 (_("%B: file class %s incompatible with %s"),
10974 sub, iclass, oclass);
10983 /* Free symbol buffer if needed. */
10984 if (!info->reduce_memory_overheads)
10986 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
10987 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10988 && elf_tdata (sub)->symbuf)
10990 free (elf_tdata (sub)->symbuf);
10991 elf_tdata (sub)->symbuf = NULL;
10995 /* Output any global symbols that got converted to local in a
10996 version script or due to symbol visibility. We do this in a
10997 separate step since ELF requires all local symbols to appear
10998 prior to any global symbols. FIXME: We should only do this if
10999 some global symbols were, in fact, converted to become local.
11000 FIXME: Will this work correctly with the Irix 5 linker? */
11001 eoinfo.failed = FALSE;
11002 eoinfo.flinfo = &flinfo;
11003 eoinfo.localsyms = TRUE;
11004 eoinfo.need_second_pass = FALSE;
11005 eoinfo.second_pass = FALSE;
11006 eoinfo.file_sym_done = FALSE;
11007 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11011 if (eoinfo.need_second_pass)
11013 eoinfo.second_pass = TRUE;
11014 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11019 /* If backend needs to output some local symbols not present in the hash
11020 table, do it now. */
11021 if (bed->elf_backend_output_arch_local_syms)
11023 typedef int (*out_sym_func)
11024 (void *, const char *, Elf_Internal_Sym *, asection *,
11025 struct elf_link_hash_entry *);
11027 if (! ((*bed->elf_backend_output_arch_local_syms)
11028 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11032 /* That wrote out all the local symbols. Finish up the symbol table
11033 with the global symbols. Even if we want to strip everything we
11034 can, we still need to deal with those global symbols that got
11035 converted to local in a version script. */
11037 /* The sh_info field records the index of the first non local symbol. */
11038 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11041 && flinfo.dynsym_sec != NULL
11042 && flinfo.dynsym_sec->output_section != bfd_abs_section_ptr)
11044 Elf_Internal_Sym sym;
11045 bfd_byte *dynsym = flinfo.dynsym_sec->contents;
11046 long last_local = 0;
11048 /* Write out the section symbols for the output sections. */
11049 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
11055 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11057 sym.st_target_internal = 0;
11059 for (s = abfd->sections; s != NULL; s = s->next)
11065 dynindx = elf_section_data (s)->dynindx;
11068 indx = elf_section_data (s)->this_idx;
11069 BFD_ASSERT (indx > 0);
11070 sym.st_shndx = indx;
11071 if (! check_dynsym (abfd, &sym))
11073 sym.st_value = s->vma;
11074 dest = dynsym + dynindx * bed->s->sizeof_sym;
11075 if (last_local < dynindx)
11076 last_local = dynindx;
11077 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11081 /* Write out the local dynsyms. */
11082 if (elf_hash_table (info)->dynlocal)
11084 struct elf_link_local_dynamic_entry *e;
11085 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11090 /* Copy the internal symbol and turn off visibility.
11091 Note that we saved a word of storage and overwrote
11092 the original st_name with the dynstr_index. */
11094 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11096 s = bfd_section_from_elf_index (e->input_bfd,
11101 elf_section_data (s->output_section)->this_idx;
11102 if (! check_dynsym (abfd, &sym))
11104 sym.st_value = (s->output_section->vma
11106 + e->isym.st_value);
11109 if (last_local < e->dynindx)
11110 last_local = e->dynindx;
11112 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11113 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11117 elf_section_data (flinfo.dynsym_sec->output_section)->this_hdr.sh_info =
11121 /* We get the global symbols from the hash table. */
11122 eoinfo.failed = FALSE;
11123 eoinfo.localsyms = FALSE;
11124 eoinfo.flinfo = &flinfo;
11125 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11129 /* If backend needs to output some symbols not present in the hash
11130 table, do it now. */
11131 if (bed->elf_backend_output_arch_syms)
11133 typedef int (*out_sym_func)
11134 (void *, const char *, Elf_Internal_Sym *, asection *,
11135 struct elf_link_hash_entry *);
11137 if (! ((*bed->elf_backend_output_arch_syms)
11138 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11142 /* Flush all symbols to the file. */
11143 if (! elf_link_flush_output_syms (&flinfo, bed))
11146 /* Now we know the size of the symtab section. */
11147 off += symtab_hdr->sh_size;
11149 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
11150 if (symtab_shndx_hdr->sh_name != 0)
11152 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11153 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11154 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11155 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11156 symtab_shndx_hdr->sh_size = amt;
11158 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11161 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11162 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11167 /* Finish up and write out the symbol string table (.strtab)
11169 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11170 /* sh_name was set in prep_headers. */
11171 symstrtab_hdr->sh_type = SHT_STRTAB;
11172 symstrtab_hdr->sh_flags = 0;
11173 symstrtab_hdr->sh_addr = 0;
11174 symstrtab_hdr->sh_size = _bfd_stringtab_size (flinfo.symstrtab);
11175 symstrtab_hdr->sh_entsize = 0;
11176 symstrtab_hdr->sh_link = 0;
11177 symstrtab_hdr->sh_info = 0;
11178 /* sh_offset is set just below. */
11179 symstrtab_hdr->sh_addralign = 1;
11181 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
11182 elf_next_file_pos (abfd) = off;
11184 if (bfd_get_symcount (abfd) > 0)
11186 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11187 || ! _bfd_stringtab_emit (abfd, flinfo.symstrtab))
11191 /* Adjust the relocs to have the correct symbol indices. */
11192 for (o = abfd->sections; o != NULL; o = o->next)
11194 struct bfd_elf_section_data *esdo = elf_section_data (o);
11195 if ((o->flags & SEC_RELOC) == 0)
11198 if (esdo->rel.hdr != NULL)
11199 elf_link_adjust_relocs (abfd, &esdo->rel);
11200 if (esdo->rela.hdr != NULL)
11201 elf_link_adjust_relocs (abfd, &esdo->rela);
11203 /* Set the reloc_count field to 0 to prevent write_relocs from
11204 trying to swap the relocs out itself. */
11205 o->reloc_count = 0;
11208 if (dynamic && info->combreloc && dynobj != NULL)
11209 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11211 /* If we are linking against a dynamic object, or generating a
11212 shared library, finish up the dynamic linking information. */
11215 bfd_byte *dyncon, *dynconend;
11217 /* Fix up .dynamic entries. */
11218 o = bfd_get_linker_section (dynobj, ".dynamic");
11219 BFD_ASSERT (o != NULL);
11221 dyncon = o->contents;
11222 dynconend = o->contents + o->size;
11223 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11225 Elf_Internal_Dyn dyn;
11229 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11236 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11238 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11240 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11241 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11244 dyn.d_un.d_val = relativecount;
11251 name = info->init_function;
11254 name = info->fini_function;
11257 struct elf_link_hash_entry *h;
11259 h = elf_link_hash_lookup (elf_hash_table (info), name,
11260 FALSE, FALSE, TRUE);
11262 && (h->root.type == bfd_link_hash_defined
11263 || h->root.type == bfd_link_hash_defweak))
11265 dyn.d_un.d_ptr = h->root.u.def.value;
11266 o = h->root.u.def.section;
11267 if (o->output_section != NULL)
11268 dyn.d_un.d_ptr += (o->output_section->vma
11269 + o->output_offset);
11272 /* The symbol is imported from another shared
11273 library and does not apply to this one. */
11274 dyn.d_un.d_ptr = 0;
11281 case DT_PREINIT_ARRAYSZ:
11282 name = ".preinit_array";
11284 case DT_INIT_ARRAYSZ:
11285 name = ".init_array";
11287 case DT_FINI_ARRAYSZ:
11288 name = ".fini_array";
11290 o = bfd_get_section_by_name (abfd, name);
11293 (*_bfd_error_handler)
11294 (_("%B: could not find output section %s"), abfd, name);
11298 (*_bfd_error_handler)
11299 (_("warning: %s section has zero size"), name);
11300 dyn.d_un.d_val = o->size;
11303 case DT_PREINIT_ARRAY:
11304 name = ".preinit_array";
11306 case DT_INIT_ARRAY:
11307 name = ".init_array";
11309 case DT_FINI_ARRAY:
11310 name = ".fini_array";
11317 name = ".gnu.hash";
11326 name = ".gnu.version_d";
11329 name = ".gnu.version_r";
11332 name = ".gnu.version";
11334 o = bfd_get_section_by_name (abfd, name);
11337 (*_bfd_error_handler)
11338 (_("%B: could not find output section %s"), abfd, name);
11341 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11343 (*_bfd_error_handler)
11344 (_("warning: section '%s' is being made into a note"), name);
11345 bfd_set_error (bfd_error_nonrepresentable_section);
11348 dyn.d_un.d_ptr = o->vma;
11355 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11359 dyn.d_un.d_val = 0;
11360 dyn.d_un.d_ptr = 0;
11361 for (i = 1; i < elf_numsections (abfd); i++)
11363 Elf_Internal_Shdr *hdr;
11365 hdr = elf_elfsections (abfd)[i];
11366 if (hdr->sh_type == type
11367 && (hdr->sh_flags & SHF_ALLOC) != 0)
11369 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11370 dyn.d_un.d_val += hdr->sh_size;
11373 if (dyn.d_un.d_ptr == 0
11374 || hdr->sh_addr < dyn.d_un.d_ptr)
11375 dyn.d_un.d_ptr = hdr->sh_addr;
11381 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11385 /* If we have created any dynamic sections, then output them. */
11386 if (dynobj != NULL)
11388 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11391 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11392 if (((info->warn_shared_textrel && info->shared)
11393 || info->error_textrel)
11394 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11396 bfd_byte *dyncon, *dynconend;
11398 dyncon = o->contents;
11399 dynconend = o->contents + o->size;
11400 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11402 Elf_Internal_Dyn dyn;
11404 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11406 if (dyn.d_tag == DT_TEXTREL)
11408 if (info->error_textrel)
11409 info->callbacks->einfo
11410 (_("%P%X: read-only segment has dynamic relocations.\n"));
11412 info->callbacks->einfo
11413 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11419 for (o = dynobj->sections; o != NULL; o = o->next)
11421 if ((o->flags & SEC_HAS_CONTENTS) == 0
11423 || o->output_section == bfd_abs_section_ptr)
11425 if ((o->flags & SEC_LINKER_CREATED) == 0)
11427 /* At this point, we are only interested in sections
11428 created by _bfd_elf_link_create_dynamic_sections. */
11431 if (elf_hash_table (info)->stab_info.stabstr == o)
11433 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11435 if (strcmp (o->name, ".dynstr") != 0)
11437 /* FIXME: octets_per_byte. */
11438 if (! bfd_set_section_contents (abfd, o->output_section,
11440 (file_ptr) o->output_offset,
11446 /* The contents of the .dynstr section are actually in a
11448 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11449 if (bfd_seek (abfd, off, SEEK_SET) != 0
11450 || ! _bfd_elf_strtab_emit (abfd,
11451 elf_hash_table (info)->dynstr))
11457 if (info->relocatable)
11459 bfd_boolean failed = FALSE;
11461 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11466 /* If we have optimized stabs strings, output them. */
11467 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11469 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11473 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11476 elf_final_link_free (abfd, &flinfo);
11478 elf_linker (abfd) = TRUE;
11482 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11483 if (contents == NULL)
11484 return FALSE; /* Bail out and fail. */
11485 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11486 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11493 elf_final_link_free (abfd, &flinfo);
11497 /* Initialize COOKIE for input bfd ABFD. */
11500 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11501 struct bfd_link_info *info, bfd *abfd)
11503 Elf_Internal_Shdr *symtab_hdr;
11504 const struct elf_backend_data *bed;
11506 bed = get_elf_backend_data (abfd);
11507 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11509 cookie->abfd = abfd;
11510 cookie->sym_hashes = elf_sym_hashes (abfd);
11511 cookie->bad_symtab = elf_bad_symtab (abfd);
11512 if (cookie->bad_symtab)
11514 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11515 cookie->extsymoff = 0;
11519 cookie->locsymcount = symtab_hdr->sh_info;
11520 cookie->extsymoff = symtab_hdr->sh_info;
11523 if (bed->s->arch_size == 32)
11524 cookie->r_sym_shift = 8;
11526 cookie->r_sym_shift = 32;
11528 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11529 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11531 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11532 cookie->locsymcount, 0,
11534 if (cookie->locsyms == NULL)
11536 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11539 if (info->keep_memory)
11540 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11545 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11548 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11550 Elf_Internal_Shdr *symtab_hdr;
11552 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11553 if (cookie->locsyms != NULL
11554 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11555 free (cookie->locsyms);
11558 /* Initialize the relocation information in COOKIE for input section SEC
11559 of input bfd ABFD. */
11562 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11563 struct bfd_link_info *info, bfd *abfd,
11566 const struct elf_backend_data *bed;
11568 if (sec->reloc_count == 0)
11570 cookie->rels = NULL;
11571 cookie->relend = NULL;
11575 bed = get_elf_backend_data (abfd);
11577 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11578 info->keep_memory);
11579 if (cookie->rels == NULL)
11581 cookie->rel = cookie->rels;
11582 cookie->relend = (cookie->rels
11583 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11585 cookie->rel = cookie->rels;
11589 /* Free the memory allocated by init_reloc_cookie_rels,
11593 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11596 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11597 free (cookie->rels);
11600 /* Initialize the whole of COOKIE for input section SEC. */
11603 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11604 struct bfd_link_info *info,
11607 if (!init_reloc_cookie (cookie, info, sec->owner))
11609 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11614 fini_reloc_cookie (cookie, sec->owner);
11619 /* Free the memory allocated by init_reloc_cookie_for_section,
11623 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11626 fini_reloc_cookie_rels (cookie, sec);
11627 fini_reloc_cookie (cookie, sec->owner);
11630 /* Garbage collect unused sections. */
11632 /* Default gc_mark_hook. */
11635 _bfd_elf_gc_mark_hook (asection *sec,
11636 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11637 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11638 struct elf_link_hash_entry *h,
11639 Elf_Internal_Sym *sym)
11641 const char *sec_name;
11645 switch (h->root.type)
11647 case bfd_link_hash_defined:
11648 case bfd_link_hash_defweak:
11649 return h->root.u.def.section;
11651 case bfd_link_hash_common:
11652 return h->root.u.c.p->section;
11654 case bfd_link_hash_undefined:
11655 case bfd_link_hash_undefweak:
11656 /* To work around a glibc bug, keep all XXX input sections
11657 when there is an as yet undefined reference to __start_XXX
11658 or __stop_XXX symbols. The linker will later define such
11659 symbols for orphan input sections that have a name
11660 representable as a C identifier. */
11661 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11662 sec_name = h->root.root.string + 8;
11663 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11664 sec_name = h->root.root.string + 7;
11668 if (sec_name && *sec_name != '\0')
11672 for (i = info->input_bfds; i; i = i->link.next)
11674 sec = bfd_get_section_by_name (i, sec_name);
11676 sec->flags |= SEC_KEEP;
11686 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11691 /* COOKIE->rel describes a relocation against section SEC, which is
11692 a section we've decided to keep. Return the section that contains
11693 the relocation symbol, or NULL if no section contains it. */
11696 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11697 elf_gc_mark_hook_fn gc_mark_hook,
11698 struct elf_reloc_cookie *cookie)
11700 unsigned long r_symndx;
11701 struct elf_link_hash_entry *h;
11703 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11704 if (r_symndx == STN_UNDEF)
11707 if (r_symndx >= cookie->locsymcount
11708 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11710 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11711 while (h->root.type == bfd_link_hash_indirect
11712 || h->root.type == bfd_link_hash_warning)
11713 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11715 /* If this symbol is weak and there is a non-weak definition, we
11716 keep the non-weak definition because many backends put
11717 dynamic reloc info on the non-weak definition for code
11718 handling copy relocs. */
11719 if (h->u.weakdef != NULL)
11720 h->u.weakdef->mark = 1;
11721 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11724 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11725 &cookie->locsyms[r_symndx]);
11728 /* COOKIE->rel describes a relocation against section SEC, which is
11729 a section we've decided to keep. Mark the section that contains
11730 the relocation symbol. */
11733 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11735 elf_gc_mark_hook_fn gc_mark_hook,
11736 struct elf_reloc_cookie *cookie)
11740 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11741 if (rsec && !rsec->gc_mark)
11743 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
11744 || (rsec->owner->flags & DYNAMIC) != 0)
11746 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11752 /* The mark phase of garbage collection. For a given section, mark
11753 it and any sections in this section's group, and all the sections
11754 which define symbols to which it refers. */
11757 _bfd_elf_gc_mark (struct bfd_link_info *info,
11759 elf_gc_mark_hook_fn gc_mark_hook)
11762 asection *group_sec, *eh_frame;
11766 /* Mark all the sections in the group. */
11767 group_sec = elf_section_data (sec)->next_in_group;
11768 if (group_sec && !group_sec->gc_mark)
11769 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11772 /* Look through the section relocs. */
11774 eh_frame = elf_eh_frame_section (sec->owner);
11775 if ((sec->flags & SEC_RELOC) != 0
11776 && sec->reloc_count > 0
11777 && sec != eh_frame)
11779 struct elf_reloc_cookie cookie;
11781 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11785 for (; cookie.rel < cookie.relend; cookie.rel++)
11786 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11791 fini_reloc_cookie_for_section (&cookie, sec);
11795 if (ret && eh_frame && elf_fde_list (sec))
11797 struct elf_reloc_cookie cookie;
11799 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11803 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11804 gc_mark_hook, &cookie))
11806 fini_reloc_cookie_for_section (&cookie, eh_frame);
11813 /* Keep debug and special sections. */
11816 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
11817 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
11821 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
11824 bfd_boolean some_kept;
11825 bfd_boolean debug_frag_seen;
11827 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
11830 /* Ensure all linker created sections are kept,
11831 see if any other section is already marked,
11832 and note if we have any fragmented debug sections. */
11833 debug_frag_seen = some_kept = FALSE;
11834 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11836 if ((isec->flags & SEC_LINKER_CREATED) != 0)
11838 else if (isec->gc_mark)
11841 if (debug_frag_seen == FALSE
11842 && (isec->flags & SEC_DEBUGGING)
11843 && CONST_STRNEQ (isec->name, ".debug_line."))
11844 debug_frag_seen = TRUE;
11847 /* If no section in this file will be kept, then we can
11848 toss out the debug and special sections. */
11852 /* Keep debug and special sections like .comment when they are
11853 not part of a group, or when we have single-member groups. */
11854 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11855 if ((elf_next_in_group (isec) == NULL
11856 || elf_next_in_group (isec) == isec)
11857 && ((isec->flags & SEC_DEBUGGING) != 0
11858 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0))
11861 if (! debug_frag_seen)
11864 /* Look for CODE sections which are going to be discarded,
11865 and find and discard any fragmented debug sections which
11866 are associated with that code section. */
11867 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11868 if ((isec->flags & SEC_CODE) != 0
11869 && isec->gc_mark == 0)
11874 ilen = strlen (isec->name);
11876 /* Association is determined by the name of the debug section
11877 containing the name of the code section as a suffix. For
11878 example .debug_line.text.foo is a debug section associated
11880 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
11884 if (dsec->gc_mark == 0
11885 || (dsec->flags & SEC_DEBUGGING) == 0)
11888 dlen = strlen (dsec->name);
11891 && strncmp (dsec->name + (dlen - ilen),
11892 isec->name, ilen) == 0)
11903 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11905 struct elf_gc_sweep_symbol_info
11907 struct bfd_link_info *info;
11908 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
11913 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
11916 && (((h->root.type == bfd_link_hash_defined
11917 || h->root.type == bfd_link_hash_defweak)
11918 && !(h->def_regular
11919 && h->root.u.def.section->gc_mark))
11920 || h->root.type == bfd_link_hash_undefined
11921 || h->root.type == bfd_link_hash_undefweak))
11923 struct elf_gc_sweep_symbol_info *inf;
11925 inf = (struct elf_gc_sweep_symbol_info *) data;
11926 (*inf->hide_symbol) (inf->info, h, TRUE);
11927 h->def_regular = 0;
11928 h->ref_regular = 0;
11929 h->ref_regular_nonweak = 0;
11935 /* The sweep phase of garbage collection. Remove all garbage sections. */
11937 typedef bfd_boolean (*gc_sweep_hook_fn)
11938 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
11941 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
11944 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11945 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
11946 unsigned long section_sym_count;
11947 struct elf_gc_sweep_symbol_info sweep_info;
11949 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11953 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11956 for (o = sub->sections; o != NULL; o = o->next)
11958 /* When any section in a section group is kept, we keep all
11959 sections in the section group. If the first member of
11960 the section group is excluded, we will also exclude the
11962 if (o->flags & SEC_GROUP)
11964 asection *first = elf_next_in_group (o);
11965 o->gc_mark = first->gc_mark;
11971 /* Skip sweeping sections already excluded. */
11972 if (o->flags & SEC_EXCLUDE)
11975 /* Since this is early in the link process, it is simple
11976 to remove a section from the output. */
11977 o->flags |= SEC_EXCLUDE;
11979 if (info->print_gc_sections && o->size != 0)
11980 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
11982 /* But we also have to update some of the relocation
11983 info we collected before. */
11985 && (o->flags & SEC_RELOC) != 0
11986 && o->reloc_count != 0
11987 && !((info->strip == strip_all || info->strip == strip_debugger)
11988 && (o->flags & SEC_DEBUGGING) != 0)
11989 && !bfd_is_abs_section (o->output_section))
11991 Elf_Internal_Rela *internal_relocs;
11995 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
11996 info->keep_memory);
11997 if (internal_relocs == NULL)
12000 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
12002 if (elf_section_data (o)->relocs != internal_relocs)
12003 free (internal_relocs);
12011 /* Remove the symbols that were in the swept sections from the dynamic
12012 symbol table. GCFIXME: Anyone know how to get them out of the
12013 static symbol table as well? */
12014 sweep_info.info = info;
12015 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
12016 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
12019 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
12023 /* Propagate collected vtable information. This is called through
12024 elf_link_hash_traverse. */
12027 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
12029 /* Those that are not vtables. */
12030 if (h->vtable == NULL || h->vtable->parent == NULL)
12033 /* Those vtables that do not have parents, we cannot merge. */
12034 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12037 /* If we've already been done, exit. */
12038 if (h->vtable->used && h->vtable->used[-1])
12041 /* Make sure the parent's table is up to date. */
12042 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12044 if (h->vtable->used == NULL)
12046 /* None of this table's entries were referenced. Re-use the
12048 h->vtable->used = h->vtable->parent->vtable->used;
12049 h->vtable->size = h->vtable->parent->vtable->size;
12054 bfd_boolean *cu, *pu;
12056 /* Or the parent's entries into ours. */
12057 cu = h->vtable->used;
12059 pu = h->vtable->parent->vtable->used;
12062 const struct elf_backend_data *bed;
12063 unsigned int log_file_align;
12065 bed = get_elf_backend_data (h->root.u.def.section->owner);
12066 log_file_align = bed->s->log_file_align;
12067 n = h->vtable->parent->vtable->size >> log_file_align;
12082 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12085 bfd_vma hstart, hend;
12086 Elf_Internal_Rela *relstart, *relend, *rel;
12087 const struct elf_backend_data *bed;
12088 unsigned int log_file_align;
12090 /* Take care of both those symbols that do not describe vtables as
12091 well as those that are not loaded. */
12092 if (h->vtable == NULL || h->vtable->parent == NULL)
12095 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12096 || h->root.type == bfd_link_hash_defweak);
12098 sec = h->root.u.def.section;
12099 hstart = h->root.u.def.value;
12100 hend = hstart + h->size;
12102 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12104 return *(bfd_boolean *) okp = FALSE;
12105 bed = get_elf_backend_data (sec->owner);
12106 log_file_align = bed->s->log_file_align;
12108 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12110 for (rel = relstart; rel < relend; ++rel)
12111 if (rel->r_offset >= hstart && rel->r_offset < hend)
12113 /* If the entry is in use, do nothing. */
12114 if (h->vtable->used
12115 && (rel->r_offset - hstart) < h->vtable->size)
12117 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12118 if (h->vtable->used[entry])
12121 /* Otherwise, kill it. */
12122 rel->r_offset = rel->r_info = rel->r_addend = 0;
12128 /* Mark sections containing dynamically referenced symbols. When
12129 building shared libraries, we must assume that any visible symbol is
12133 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12135 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12136 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12138 if ((h->root.type == bfd_link_hash_defined
12139 || h->root.type == bfd_link_hash_defweak)
12142 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12143 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12144 && (!info->executable
12145 || info->export_dynamic
12148 && (*d->match) (&d->head, NULL, h->root.root.string)))
12149 && (strchr (h->root.root.string, ELF_VER_CHR) != NULL
12150 || !bfd_hide_sym_by_version (info->version_info,
12151 h->root.root.string)))))
12152 h->root.u.def.section->flags |= SEC_KEEP;
12157 /* Keep all sections containing symbols undefined on the command-line,
12158 and the section containing the entry symbol. */
12161 _bfd_elf_gc_keep (struct bfd_link_info *info)
12163 struct bfd_sym_chain *sym;
12165 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12167 struct elf_link_hash_entry *h;
12169 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12170 FALSE, FALSE, FALSE);
12173 && (h->root.type == bfd_link_hash_defined
12174 || h->root.type == bfd_link_hash_defweak)
12175 && !bfd_is_abs_section (h->root.u.def.section))
12176 h->root.u.def.section->flags |= SEC_KEEP;
12180 /* Do mark and sweep of unused sections. */
12183 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12185 bfd_boolean ok = TRUE;
12187 elf_gc_mark_hook_fn gc_mark_hook;
12188 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12190 if (!bed->can_gc_sections
12191 || !is_elf_hash_table (info->hash))
12193 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12197 bed->gc_keep (info);
12199 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12200 at the .eh_frame section if we can mark the FDEs individually. */
12201 _bfd_elf_begin_eh_frame_parsing (info);
12202 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12205 struct elf_reloc_cookie cookie;
12207 sec = bfd_get_section_by_name (sub, ".eh_frame");
12208 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12210 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12211 if (elf_section_data (sec)->sec_info
12212 && (sec->flags & SEC_LINKER_CREATED) == 0)
12213 elf_eh_frame_section (sub) = sec;
12214 fini_reloc_cookie_for_section (&cookie, sec);
12215 sec = bfd_get_next_section_by_name (sec);
12218 _bfd_elf_end_eh_frame_parsing (info);
12220 /* Apply transitive closure to the vtable entry usage info. */
12221 elf_link_hash_traverse (elf_hash_table (info),
12222 elf_gc_propagate_vtable_entries_used,
12227 /* Kill the vtable relocations that were not used. */
12228 elf_link_hash_traverse (elf_hash_table (info),
12229 elf_gc_smash_unused_vtentry_relocs,
12234 /* Mark dynamically referenced symbols. */
12235 if (elf_hash_table (info)->dynamic_sections_created)
12236 elf_link_hash_traverse (elf_hash_table (info),
12237 bed->gc_mark_dynamic_ref,
12240 /* Grovel through relocs to find out who stays ... */
12241 gc_mark_hook = bed->gc_mark_hook;
12242 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12246 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12249 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12250 Also treat note sections as a root, if the section is not part
12252 for (o = sub->sections; o != NULL; o = o->next)
12254 && (o->flags & SEC_EXCLUDE) == 0
12255 && ((o->flags & SEC_KEEP) != 0
12256 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12257 && elf_next_in_group (o) == NULL )))
12259 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12264 /* Allow the backend to mark additional target specific sections. */
12265 bed->gc_mark_extra_sections (info, gc_mark_hook);
12267 /* ... and mark SEC_EXCLUDE for those that go. */
12268 return elf_gc_sweep (abfd, info);
12271 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12274 bfd_elf_gc_record_vtinherit (bfd *abfd,
12276 struct elf_link_hash_entry *h,
12279 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12280 struct elf_link_hash_entry **search, *child;
12281 bfd_size_type extsymcount;
12282 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12284 /* The sh_info field of the symtab header tells us where the
12285 external symbols start. We don't care about the local symbols at
12287 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12288 if (!elf_bad_symtab (abfd))
12289 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12291 sym_hashes = elf_sym_hashes (abfd);
12292 sym_hashes_end = sym_hashes + extsymcount;
12294 /* Hunt down the child symbol, which is in this section at the same
12295 offset as the relocation. */
12296 for (search = sym_hashes; search != sym_hashes_end; ++search)
12298 if ((child = *search) != NULL
12299 && (child->root.type == bfd_link_hash_defined
12300 || child->root.type == bfd_link_hash_defweak)
12301 && child->root.u.def.section == sec
12302 && child->root.u.def.value == offset)
12306 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12307 abfd, sec, (unsigned long) offset);
12308 bfd_set_error (bfd_error_invalid_operation);
12312 if (!child->vtable)
12314 child->vtable = (struct elf_link_virtual_table_entry *)
12315 bfd_zalloc (abfd, sizeof (*child->vtable));
12316 if (!child->vtable)
12321 /* This *should* only be the absolute section. It could potentially
12322 be that someone has defined a non-global vtable though, which
12323 would be bad. It isn't worth paging in the local symbols to be
12324 sure though; that case should simply be handled by the assembler. */
12326 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12329 child->vtable->parent = h;
12334 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12337 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12338 asection *sec ATTRIBUTE_UNUSED,
12339 struct elf_link_hash_entry *h,
12342 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12343 unsigned int log_file_align = bed->s->log_file_align;
12347 h->vtable = (struct elf_link_virtual_table_entry *)
12348 bfd_zalloc (abfd, sizeof (*h->vtable));
12353 if (addend >= h->vtable->size)
12355 size_t size, bytes, file_align;
12356 bfd_boolean *ptr = h->vtable->used;
12358 /* While the symbol is undefined, we have to be prepared to handle
12360 file_align = 1 << log_file_align;
12361 if (h->root.type == bfd_link_hash_undefined)
12362 size = addend + file_align;
12366 if (addend >= size)
12368 /* Oops! We've got a reference past the defined end of
12369 the table. This is probably a bug -- shall we warn? */
12370 size = addend + file_align;
12373 size = (size + file_align - 1) & -file_align;
12375 /* Allocate one extra entry for use as a "done" flag for the
12376 consolidation pass. */
12377 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12381 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12387 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12388 * sizeof (bfd_boolean));
12389 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12393 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12398 /* And arrange for that done flag to be at index -1. */
12399 h->vtable->used = ptr + 1;
12400 h->vtable->size = size;
12403 h->vtable->used[addend >> log_file_align] = TRUE;
12408 /* Map an ELF section header flag to its corresponding string. */
12412 flagword flag_value;
12413 } elf_flags_to_name_table;
12415 static elf_flags_to_name_table elf_flags_to_names [] =
12417 { "SHF_WRITE", SHF_WRITE },
12418 { "SHF_ALLOC", SHF_ALLOC },
12419 { "SHF_EXECINSTR", SHF_EXECINSTR },
12420 { "SHF_MERGE", SHF_MERGE },
12421 { "SHF_STRINGS", SHF_STRINGS },
12422 { "SHF_INFO_LINK", SHF_INFO_LINK},
12423 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
12424 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
12425 { "SHF_GROUP", SHF_GROUP },
12426 { "SHF_TLS", SHF_TLS },
12427 { "SHF_MASKOS", SHF_MASKOS },
12428 { "SHF_EXCLUDE", SHF_EXCLUDE },
12431 /* Returns TRUE if the section is to be included, otherwise FALSE. */
12433 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
12434 struct flag_info *flaginfo,
12437 const bfd_vma sh_flags = elf_section_flags (section);
12439 if (!flaginfo->flags_initialized)
12441 bfd *obfd = info->output_bfd;
12442 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12443 struct flag_info_list *tf = flaginfo->flag_list;
12445 int without_hex = 0;
12447 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
12450 flagword (*lookup) (char *);
12452 lookup = bed->elf_backend_lookup_section_flags_hook;
12453 if (lookup != NULL)
12455 flagword hexval = (*lookup) ((char *) tf->name);
12459 if (tf->with == with_flags)
12460 with_hex |= hexval;
12461 else if (tf->with == without_flags)
12462 without_hex |= hexval;
12467 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
12469 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
12471 if (tf->with == with_flags)
12472 with_hex |= elf_flags_to_names[i].flag_value;
12473 else if (tf->with == without_flags)
12474 without_hex |= elf_flags_to_names[i].flag_value;
12481 info->callbacks->einfo
12482 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
12486 flaginfo->flags_initialized = TRUE;
12487 flaginfo->only_with_flags |= with_hex;
12488 flaginfo->not_with_flags |= without_hex;
12491 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
12494 if ((flaginfo->not_with_flags & sh_flags) != 0)
12500 struct alloc_got_off_arg {
12502 struct bfd_link_info *info;
12505 /* We need a special top-level link routine to convert got reference counts
12506 to real got offsets. */
12509 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12511 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12512 bfd *obfd = gofarg->info->output_bfd;
12513 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12515 if (h->got.refcount > 0)
12517 h->got.offset = gofarg->gotoff;
12518 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12521 h->got.offset = (bfd_vma) -1;
12526 /* And an accompanying bit to work out final got entry offsets once
12527 we're done. Should be called from final_link. */
12530 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12531 struct bfd_link_info *info)
12534 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12536 struct alloc_got_off_arg gofarg;
12538 BFD_ASSERT (abfd == info->output_bfd);
12540 if (! is_elf_hash_table (info->hash))
12543 /* The GOT offset is relative to the .got section, but the GOT header is
12544 put into the .got.plt section, if the backend uses it. */
12545 if (bed->want_got_plt)
12548 gotoff = bed->got_header_size;
12550 /* Do the local .got entries first. */
12551 for (i = info->input_bfds; i; i = i->link.next)
12553 bfd_signed_vma *local_got;
12554 bfd_size_type j, locsymcount;
12555 Elf_Internal_Shdr *symtab_hdr;
12557 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12560 local_got = elf_local_got_refcounts (i);
12564 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12565 if (elf_bad_symtab (i))
12566 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12568 locsymcount = symtab_hdr->sh_info;
12570 for (j = 0; j < locsymcount; ++j)
12572 if (local_got[j] > 0)
12574 local_got[j] = gotoff;
12575 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12578 local_got[j] = (bfd_vma) -1;
12582 /* Then the global .got entries. .plt refcounts are handled by
12583 adjust_dynamic_symbol */
12584 gofarg.gotoff = gotoff;
12585 gofarg.info = info;
12586 elf_link_hash_traverse (elf_hash_table (info),
12587 elf_gc_allocate_got_offsets,
12592 /* Many folk need no more in the way of final link than this, once
12593 got entry reference counting is enabled. */
12596 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12598 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12601 /* Invoke the regular ELF backend linker to do all the work. */
12602 return bfd_elf_final_link (abfd, info);
12606 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12608 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12610 if (rcookie->bad_symtab)
12611 rcookie->rel = rcookie->rels;
12613 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12615 unsigned long r_symndx;
12617 if (! rcookie->bad_symtab)
12618 if (rcookie->rel->r_offset > offset)
12620 if (rcookie->rel->r_offset != offset)
12623 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12624 if (r_symndx == STN_UNDEF)
12627 if (r_symndx >= rcookie->locsymcount
12628 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12630 struct elf_link_hash_entry *h;
12632 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12634 while (h->root.type == bfd_link_hash_indirect
12635 || h->root.type == bfd_link_hash_warning)
12636 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12638 if ((h->root.type == bfd_link_hash_defined
12639 || h->root.type == bfd_link_hash_defweak)
12640 && discarded_section (h->root.u.def.section))
12647 /* It's not a relocation against a global symbol,
12648 but it could be a relocation against a local
12649 symbol for a discarded section. */
12651 Elf_Internal_Sym *isym;
12653 /* Need to: get the symbol; get the section. */
12654 isym = &rcookie->locsyms[r_symndx];
12655 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12656 if (isec != NULL && discarded_section (isec))
12664 /* Discard unneeded references to discarded sections.
12665 Returns TRUE if any section's size was changed. */
12666 /* This function assumes that the relocations are in sorted order,
12667 which is true for all known assemblers. */
12670 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12672 struct elf_reloc_cookie cookie;
12673 asection *stab, *eh;
12674 const struct elf_backend_data *bed;
12676 bfd_boolean ret = FALSE;
12678 if (info->traditional_format
12679 || !is_elf_hash_table (info->hash))
12682 _bfd_elf_begin_eh_frame_parsing (info);
12683 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
12685 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12688 bed = get_elf_backend_data (abfd);
12691 if (!info->relocatable)
12693 eh = bfd_get_section_by_name (abfd, ".eh_frame");
12696 || bfd_is_abs_section (eh->output_section)))
12697 eh = bfd_get_next_section_by_name (eh);
12700 stab = bfd_get_section_by_name (abfd, ".stab");
12702 && (stab->size == 0
12703 || bfd_is_abs_section (stab->output_section)
12704 || stab->sec_info_type != SEC_INFO_TYPE_STABS))
12709 && bed->elf_backend_discard_info == NULL)
12712 if (!init_reloc_cookie (&cookie, info, abfd))
12716 && stab->reloc_count > 0
12717 && init_reloc_cookie_rels (&cookie, info, abfd, stab))
12719 if (_bfd_discard_section_stabs (abfd, stab,
12720 elf_section_data (stab)->sec_info,
12721 bfd_elf_reloc_symbol_deleted_p,
12724 fini_reloc_cookie_rels (&cookie, stab);
12728 && init_reloc_cookie_rels (&cookie, info, abfd, eh))
12730 _bfd_elf_parse_eh_frame (abfd, info, eh, &cookie);
12731 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
12732 bfd_elf_reloc_symbol_deleted_p,
12735 fini_reloc_cookie_rels (&cookie, eh);
12736 eh = bfd_get_next_section_by_name (eh);
12739 if (bed->elf_backend_discard_info != NULL
12740 && (*bed->elf_backend_discard_info) (abfd, &cookie, info))
12743 fini_reloc_cookie (&cookie, abfd);
12745 _bfd_elf_end_eh_frame_parsing (info);
12747 if (info->eh_frame_hdr
12748 && !info->relocatable
12749 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12756 _bfd_elf_section_already_linked (bfd *abfd,
12758 struct bfd_link_info *info)
12761 const char *name, *key;
12762 struct bfd_section_already_linked *l;
12763 struct bfd_section_already_linked_hash_entry *already_linked_list;
12765 if (sec->output_section == bfd_abs_section_ptr)
12768 flags = sec->flags;
12770 /* Return if it isn't a linkonce section. A comdat group section
12771 also has SEC_LINK_ONCE set. */
12772 if ((flags & SEC_LINK_ONCE) == 0)
12775 /* Don't put group member sections on our list of already linked
12776 sections. They are handled as a group via their group section. */
12777 if (elf_sec_group (sec) != NULL)
12780 /* For a SHT_GROUP section, use the group signature as the key. */
12782 if ((flags & SEC_GROUP) != 0
12783 && elf_next_in_group (sec) != NULL
12784 && elf_group_name (elf_next_in_group (sec)) != NULL)
12785 key = elf_group_name (elf_next_in_group (sec));
12788 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
12789 if (CONST_STRNEQ (name, ".gnu.linkonce.")
12790 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
12793 /* Must be a user linkonce section that doesn't follow gcc's
12794 naming convention. In this case we won't be matching
12795 single member groups. */
12799 already_linked_list = bfd_section_already_linked_table_lookup (key);
12801 for (l = already_linked_list->entry; l != NULL; l = l->next)
12803 /* We may have 2 different types of sections on the list: group
12804 sections with a signature of <key> (<key> is some string),
12805 and linkonce sections named .gnu.linkonce.<type>.<key>.
12806 Match like sections. LTO plugin sections are an exception.
12807 They are always named .gnu.linkonce.t.<key> and match either
12808 type of section. */
12809 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
12810 && ((flags & SEC_GROUP) != 0
12811 || strcmp (name, l->sec->name) == 0))
12812 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
12814 /* The section has already been linked. See if we should
12815 issue a warning. */
12816 if (!_bfd_handle_already_linked (sec, l, info))
12819 if (flags & SEC_GROUP)
12821 asection *first = elf_next_in_group (sec);
12822 asection *s = first;
12826 s->output_section = bfd_abs_section_ptr;
12827 /* Record which group discards it. */
12828 s->kept_section = l->sec;
12829 s = elf_next_in_group (s);
12830 /* These lists are circular. */
12840 /* A single member comdat group section may be discarded by a
12841 linkonce section and vice versa. */
12842 if ((flags & SEC_GROUP) != 0)
12844 asection *first = elf_next_in_group (sec);
12846 if (first != NULL && elf_next_in_group (first) == first)
12847 /* Check this single member group against linkonce sections. */
12848 for (l = already_linked_list->entry; l != NULL; l = l->next)
12849 if ((l->sec->flags & SEC_GROUP) == 0
12850 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
12852 first->output_section = bfd_abs_section_ptr;
12853 first->kept_section = l->sec;
12854 sec->output_section = bfd_abs_section_ptr;
12859 /* Check this linkonce section against single member groups. */
12860 for (l = already_linked_list->entry; l != NULL; l = l->next)
12861 if (l->sec->flags & SEC_GROUP)
12863 asection *first = elf_next_in_group (l->sec);
12866 && elf_next_in_group (first) == first
12867 && bfd_elf_match_symbols_in_sections (first, sec, info))
12869 sec->output_section = bfd_abs_section_ptr;
12870 sec->kept_section = first;
12875 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12876 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12877 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12878 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12879 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12880 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12881 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12882 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12883 The reverse order cannot happen as there is never a bfd with only the
12884 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12885 matter as here were are looking only for cross-bfd sections. */
12887 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
12888 for (l = already_linked_list->entry; l != NULL; l = l->next)
12889 if ((l->sec->flags & SEC_GROUP) == 0
12890 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
12892 if (abfd != l->sec->owner)
12893 sec->output_section = bfd_abs_section_ptr;
12897 /* This is the first section with this name. Record it. */
12898 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
12899 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
12900 return sec->output_section == bfd_abs_section_ptr;
12904 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
12906 return sym->st_shndx == SHN_COMMON;
12910 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
12916 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
12918 return bfd_com_section_ptr;
12922 _bfd_elf_default_got_elt_size (bfd *abfd,
12923 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12924 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
12925 bfd *ibfd ATTRIBUTE_UNUSED,
12926 unsigned long symndx ATTRIBUTE_UNUSED)
12928 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12929 return bed->s->arch_size / 8;
12932 /* Routines to support the creation of dynamic relocs. */
12934 /* Returns the name of the dynamic reloc section associated with SEC. */
12936 static const char *
12937 get_dynamic_reloc_section_name (bfd * abfd,
12939 bfd_boolean is_rela)
12942 const char *old_name = bfd_get_section_name (NULL, sec);
12943 const char *prefix = is_rela ? ".rela" : ".rel";
12945 if (old_name == NULL)
12948 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
12949 sprintf (name, "%s%s", prefix, old_name);
12954 /* Returns the dynamic reloc section associated with SEC.
12955 If necessary compute the name of the dynamic reloc section based
12956 on SEC's name (looked up in ABFD's string table) and the setting
12960 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
12962 bfd_boolean is_rela)
12964 asection * reloc_sec = elf_section_data (sec)->sreloc;
12966 if (reloc_sec == NULL)
12968 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12972 reloc_sec = bfd_get_linker_section (abfd, name);
12974 if (reloc_sec != NULL)
12975 elf_section_data (sec)->sreloc = reloc_sec;
12982 /* Returns the dynamic reloc section associated with SEC. If the
12983 section does not exist it is created and attached to the DYNOBJ
12984 bfd and stored in the SRELOC field of SEC's elf_section_data
12987 ALIGNMENT is the alignment for the newly created section and
12988 IS_RELA defines whether the name should be .rela.<SEC's name>
12989 or .rel.<SEC's name>. The section name is looked up in the
12990 string table associated with ABFD. */
12993 _bfd_elf_make_dynamic_reloc_section (asection * sec,
12995 unsigned int alignment,
12997 bfd_boolean is_rela)
12999 asection * reloc_sec = elf_section_data (sec)->sreloc;
13001 if (reloc_sec == NULL)
13003 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13008 reloc_sec = bfd_get_linker_section (dynobj, name);
13010 if (reloc_sec == NULL)
13012 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
13013 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
13014 if ((sec->flags & SEC_ALLOC) != 0)
13015 flags |= SEC_ALLOC | SEC_LOAD;
13017 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13018 if (reloc_sec != NULL)
13020 /* _bfd_elf_get_sec_type_attr chooses a section type by
13021 name. Override as it may be wrong, eg. for a user
13022 section named "auto" we'll get ".relauto" which is
13023 seen to be a .rela section. */
13024 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13025 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13030 elf_section_data (sec)->sreloc = reloc_sec;
13036 /* Copy the ELF symbol type and other attributes for a linker script
13037 assignment from HSRC to HDEST. Generally this should be treated as
13038 if we found a strong non-dynamic definition for HDEST (except that
13039 ld ignores multiple definition errors). */
13041 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13042 struct bfd_link_hash_entry *hdest,
13043 struct bfd_link_hash_entry *hsrc)
13045 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13046 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13047 Elf_Internal_Sym isym;
13049 ehdest->type = ehsrc->type;
13050 ehdest->target_internal = ehsrc->target_internal;
13052 isym.st_other = ehsrc->other;
13053 elf_merge_st_other (abfd, ehdest, &isym, TRUE, FALSE);
13056 /* Append a RELA relocation REL to section S in BFD. */
13059 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13061 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13062 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13063 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13064 bed->s->swap_reloca_out (abfd, rel, loc);
13067 /* Append a REL relocation REL to section S in BFD. */
13070 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13072 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13073 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13074 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13075 bed->s->swap_reloc_out (abfd, rel, loc);