1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 Free Software Foundation, Inc.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
29 #include "safe-ctype.h"
30 #include "libiberty.h"
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
38 struct bfd_link_info *info;
42 /* This structure is used to pass information to
43 _bfd_elf_link_find_version_dependencies. */
45 struct elf_find_verdep_info
47 /* General link information. */
48 struct bfd_link_info *info;
49 /* The number of dependencies. */
51 /* Whether we had a failure. */
55 static bfd_boolean _bfd_elf_fix_symbol_flags
56 (struct elf_link_hash_entry *, struct elf_info_failed *);
58 /* Define a symbol in a dynamic linkage section. */
60 struct elf_link_hash_entry *
61 _bfd_elf_define_linkage_sym (bfd *abfd,
62 struct bfd_link_info *info,
66 struct elf_link_hash_entry *h;
67 struct bfd_link_hash_entry *bh;
68 const struct elf_backend_data *bed;
70 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
73 /* Zap symbol defined in an as-needed lib that wasn't linked.
74 This is a symptom of a larger problem: Absolute symbols
75 defined in shared libraries can't be overridden, because we
76 lose the link to the bfd which is via the symbol section. */
77 h->root.type = bfd_link_hash_new;
81 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
83 get_elf_backend_data (abfd)->collect,
86 h = (struct elf_link_hash_entry *) bh;
90 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
92 bed = get_elf_backend_data (abfd);
93 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
98 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
102 struct elf_link_hash_entry *h;
103 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
104 struct elf_link_hash_table *htab = elf_hash_table (info);
106 /* This function may be called more than once. */
107 s = bfd_get_linker_section (abfd, ".got");
111 flags = bed->dynamic_sec_flags;
113 s = bfd_make_section_anyway_with_flags (abfd,
114 (bed->rela_plts_and_copies_p
115 ? ".rela.got" : ".rel.got"),
116 (bed->dynamic_sec_flags
119 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
123 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
125 || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
129 if (bed->want_got_plt)
131 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
133 || !bfd_set_section_alignment (abfd, s,
134 bed->s->log_file_align))
139 /* The first bit of the global offset table is the header. */
140 s->size += bed->got_header_size;
142 if (bed->want_got_sym)
144 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
145 (or .got.plt) section. We don't do this in the linker script
146 because we don't want to define the symbol if we are not creating
147 a global offset table. */
148 h = _bfd_elf_define_linkage_sym (abfd, info, s,
149 "_GLOBAL_OFFSET_TABLE_");
150 elf_hash_table (info)->hgot = h;
158 /* Create a strtab to hold the dynamic symbol names. */
160 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
162 struct elf_link_hash_table *hash_table;
164 hash_table = elf_hash_table (info);
165 if (hash_table->dynobj == NULL)
166 hash_table->dynobj = abfd;
168 if (hash_table->dynstr == NULL)
170 hash_table->dynstr = _bfd_elf_strtab_init ();
171 if (hash_table->dynstr == NULL)
177 /* Create some sections which will be filled in with dynamic linking
178 information. ABFD is an input file which requires dynamic sections
179 to be created. The dynamic sections take up virtual memory space
180 when the final executable is run, so we need to create them before
181 addresses are assigned to the output sections. We work out the
182 actual contents and size of these sections later. */
185 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
189 const struct elf_backend_data *bed;
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 if (!_bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC"))
262 s = bfd_make_section_anyway_with_flags (abfd, ".hash",
263 flags | SEC_READONLY);
265 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
267 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
270 if (info->emit_gnu_hash)
272 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
273 flags | SEC_READONLY);
275 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
277 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
278 4 32-bit words followed by variable count of 64-bit words, then
279 variable count of 32-bit words. */
280 if (bed->s->arch_size == 64)
281 elf_section_data (s)->this_hdr.sh_entsize = 0;
283 elf_section_data (s)->this_hdr.sh_entsize = 4;
286 /* Let the backend create the rest of the sections. This lets the
287 backend set the right flags. The backend will normally create
288 the .got and .plt sections. */
289 if (bed->elf_backend_create_dynamic_sections == NULL
290 || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
293 elf_hash_table (info)->dynamic_sections_created = TRUE;
298 /* Create dynamic sections when linking against a dynamic object. */
301 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
303 flagword flags, pltflags;
304 struct elf_link_hash_entry *h;
306 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
307 struct elf_link_hash_table *htab = elf_hash_table (info);
309 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
310 .rel[a].bss sections. */
311 flags = bed->dynamic_sec_flags;
314 if (bed->plt_not_loaded)
315 /* We do not clear SEC_ALLOC here because we still want the OS to
316 allocate space for the section; it's just that there's nothing
317 to read in from the object file. */
318 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
320 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
321 if (bed->plt_readonly)
322 pltflags |= SEC_READONLY;
324 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
326 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
330 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
332 if (bed->want_plt_sym)
334 h = _bfd_elf_define_linkage_sym (abfd, info, s,
335 "_PROCEDURE_LINKAGE_TABLE_");
336 elf_hash_table (info)->hplt = h;
341 s = bfd_make_section_anyway_with_flags (abfd,
342 (bed->rela_plts_and_copies_p
343 ? ".rela.plt" : ".rel.plt"),
344 flags | SEC_READONLY);
346 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
350 if (! _bfd_elf_create_got_section (abfd, info))
353 if (bed->want_dynbss)
355 /* The .dynbss section is a place to put symbols which are defined
356 by dynamic objects, are referenced by regular objects, and are
357 not functions. We must allocate space for them in the process
358 image and use a R_*_COPY reloc to tell the dynamic linker to
359 initialize them at run time. The linker script puts the .dynbss
360 section into the .bss section of the final image. */
361 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
362 (SEC_ALLOC | SEC_LINKER_CREATED));
366 /* The .rel[a].bss section holds copy relocs. This section is not
367 normally needed. We need to create it here, though, so that the
368 linker will map it to an output section. We can't just create it
369 only if we need it, because we will not know whether we need it
370 until we have seen all the input files, and the first time the
371 main linker code calls BFD after examining all the input files
372 (size_dynamic_sections) the input sections have already been
373 mapped to the output sections. If the section turns out not to
374 be needed, we can discard it later. We will never need this
375 section when generating a shared object, since they do not use
379 s = bfd_make_section_anyway_with_flags (abfd,
380 (bed->rela_plts_and_copies_p
381 ? ".rela.bss" : ".rel.bss"),
382 flags | SEC_READONLY);
384 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
392 /* Record a new dynamic symbol. We record the dynamic symbols as we
393 read the input files, since we need to have a list of all of them
394 before we can determine the final sizes of the output sections.
395 Note that we may actually call this function even though we are not
396 going to output any dynamic symbols; in some cases we know that a
397 symbol should be in the dynamic symbol table, but only if there is
401 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
402 struct elf_link_hash_entry *h)
404 if (h->dynindx == -1)
406 struct elf_strtab_hash *dynstr;
411 /* XXX: The ABI draft says the linker must turn hidden and
412 internal symbols into STB_LOCAL symbols when producing the
413 DSO. However, if ld.so honors st_other in the dynamic table,
414 this would not be necessary. */
415 switch (ELF_ST_VISIBILITY (h->other))
419 if (h->root.type != bfd_link_hash_undefined
420 && h->root.type != bfd_link_hash_undefweak)
423 if (!elf_hash_table (info)->is_relocatable_executable)
431 h->dynindx = elf_hash_table (info)->dynsymcount;
432 ++elf_hash_table (info)->dynsymcount;
434 dynstr = elf_hash_table (info)->dynstr;
437 /* Create a strtab to hold the dynamic symbol names. */
438 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
443 /* We don't put any version information in the dynamic string
445 name = h->root.root.string;
446 p = strchr (name, ELF_VER_CHR);
448 /* We know that the p points into writable memory. In fact,
449 there are only a few symbols that have read-only names, being
450 those like _GLOBAL_OFFSET_TABLE_ that are created specially
451 by the backends. Most symbols will have names pointing into
452 an ELF string table read from a file, or to objalloc memory. */
455 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
460 if (indx == (bfd_size_type) -1)
462 h->dynstr_index = indx;
468 /* Mark a symbol dynamic. */
471 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
472 struct elf_link_hash_entry *h,
473 Elf_Internal_Sym *sym)
475 struct bfd_elf_dynamic_list *d = info->dynamic_list;
477 /* It may be called more than once on the same H. */
478 if(h->dynamic || info->relocatable)
481 if ((info->dynamic_data
482 && (h->type == STT_OBJECT
484 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
486 && h->root.type == bfd_link_hash_new
487 && (*d->match) (&d->head, NULL, h->root.root.string)))
491 /* Record an assignment to a symbol made by a linker script. We need
492 this in case some dynamic object refers to this symbol. */
495 bfd_elf_record_link_assignment (bfd *output_bfd,
496 struct bfd_link_info *info,
501 struct elf_link_hash_entry *h, *hv;
502 struct elf_link_hash_table *htab;
503 const struct elf_backend_data *bed;
505 if (!is_elf_hash_table (info->hash))
508 htab = elf_hash_table (info);
509 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
513 switch (h->root.type)
515 case bfd_link_hash_defined:
516 case bfd_link_hash_defweak:
517 case bfd_link_hash_common:
519 case bfd_link_hash_undefweak:
520 case bfd_link_hash_undefined:
521 /* Since we're defining the symbol, don't let it seem to have not
522 been defined. record_dynamic_symbol and size_dynamic_sections
523 may depend on this. */
524 h->root.type = bfd_link_hash_new;
525 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
526 bfd_link_repair_undef_list (&htab->root);
528 case bfd_link_hash_new:
529 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
532 case bfd_link_hash_indirect:
533 /* We had a versioned symbol in a dynamic library. We make the
534 the versioned symbol point to this one. */
535 bed = get_elf_backend_data (output_bfd);
537 while (hv->root.type == bfd_link_hash_indirect
538 || hv->root.type == bfd_link_hash_warning)
539 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
540 /* We don't need to update h->root.u since linker will set them
542 h->root.type = bfd_link_hash_undefined;
543 hv->root.type = bfd_link_hash_indirect;
544 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
545 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
547 case bfd_link_hash_warning:
552 /* If this symbol is being provided by the linker script, and it is
553 currently defined by a dynamic object, but not by a regular
554 object, then mark it as undefined so that the generic linker will
555 force the correct value. */
559 h->root.type = bfd_link_hash_undefined;
561 /* If this symbol is not being provided by the linker script, and it is
562 currently defined by a dynamic object, but not by a regular object,
563 then clear out any version information because the symbol will not be
564 associated with the dynamic object any more. */
568 h->verinfo.verdef = NULL;
572 if (provide && hidden)
574 bed = get_elf_backend_data (output_bfd);
575 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
576 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
579 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
581 if (!info->relocatable
583 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
584 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
590 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
593 if (! bfd_elf_link_record_dynamic_symbol (info, h))
596 /* If this is a weak defined symbol, and we know a corresponding
597 real symbol from the same dynamic object, make sure the real
598 symbol is also made into a dynamic symbol. */
599 if (h->u.weakdef != NULL
600 && h->u.weakdef->dynindx == -1)
602 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
610 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
611 success, and 2 on a failure caused by attempting to record a symbol
612 in a discarded section, eg. a discarded link-once section symbol. */
615 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
620 struct elf_link_local_dynamic_entry *entry;
621 struct elf_link_hash_table *eht;
622 struct elf_strtab_hash *dynstr;
623 unsigned long dynstr_index;
625 Elf_External_Sym_Shndx eshndx;
626 char esym[sizeof (Elf64_External_Sym)];
628 if (! is_elf_hash_table (info->hash))
631 /* See if the entry exists already. */
632 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
633 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
636 amt = sizeof (*entry);
637 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
641 /* Go find the symbol, so that we can find it's name. */
642 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
643 1, input_indx, &entry->isym, esym, &eshndx))
645 bfd_release (input_bfd, entry);
649 if (entry->isym.st_shndx != SHN_UNDEF
650 && entry->isym.st_shndx < SHN_LORESERVE)
654 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
655 if (s == NULL || bfd_is_abs_section (s->output_section))
657 /* We can still bfd_release here as nothing has done another
658 bfd_alloc. We can't do this later in this function. */
659 bfd_release (input_bfd, entry);
664 name = (bfd_elf_string_from_elf_section
665 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
666 entry->isym.st_name));
668 dynstr = elf_hash_table (info)->dynstr;
671 /* Create a strtab to hold the dynamic symbol names. */
672 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
677 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
678 if (dynstr_index == (unsigned long) -1)
680 entry->isym.st_name = dynstr_index;
682 eht = elf_hash_table (info);
684 entry->next = eht->dynlocal;
685 eht->dynlocal = entry;
686 entry->input_bfd = input_bfd;
687 entry->input_indx = input_indx;
690 /* Whatever binding the symbol had before, it's now local. */
692 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
694 /* The dynindx will be set at the end of size_dynamic_sections. */
699 /* Return the dynindex of a local dynamic symbol. */
702 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
706 struct elf_link_local_dynamic_entry *e;
708 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
709 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
714 /* This function is used to renumber the dynamic symbols, if some of
715 them are removed because they are marked as local. This is called
716 via elf_link_hash_traverse. */
719 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
722 size_t *count = (size_t *) data;
727 if (h->dynindx != -1)
728 h->dynindx = ++(*count);
734 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
735 STB_LOCAL binding. */
738 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
741 size_t *count = (size_t *) data;
743 if (!h->forced_local)
746 if (h->dynindx != -1)
747 h->dynindx = ++(*count);
752 /* Return true if the dynamic symbol for a given section should be
753 omitted when creating a shared library. */
755 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
756 struct bfd_link_info *info,
759 struct elf_link_hash_table *htab;
761 switch (elf_section_data (p)->this_hdr.sh_type)
765 /* If sh_type is yet undecided, assume it could be
766 SHT_PROGBITS/SHT_NOBITS. */
768 htab = elf_hash_table (info);
769 if (p == htab->tls_sec)
772 if (htab->text_index_section != NULL)
773 return p != htab->text_index_section && p != htab->data_index_section;
775 if (strcmp (p->name, ".got") == 0
776 || strcmp (p->name, ".got.plt") == 0
777 || strcmp (p->name, ".plt") == 0)
781 if (htab->dynobj != NULL
782 && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
783 && ip->output_section == p)
788 /* There shouldn't be section relative relocations
789 against any other section. */
795 /* Assign dynsym indices. In a shared library we generate a section
796 symbol for each output section, which come first. Next come symbols
797 which have been forced to local binding. Then all of the back-end
798 allocated local dynamic syms, followed by the rest of the global
802 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
803 struct bfd_link_info *info,
804 unsigned long *section_sym_count)
806 unsigned long dynsymcount = 0;
808 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
810 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
812 for (p = output_bfd->sections; p ; p = p->next)
813 if ((p->flags & SEC_EXCLUDE) == 0
814 && (p->flags & SEC_ALLOC) != 0
815 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
816 elf_section_data (p)->dynindx = ++dynsymcount;
818 elf_section_data (p)->dynindx = 0;
820 *section_sym_count = dynsymcount;
822 elf_link_hash_traverse (elf_hash_table (info),
823 elf_link_renumber_local_hash_table_dynsyms,
826 if (elf_hash_table (info)->dynlocal)
828 struct elf_link_local_dynamic_entry *p;
829 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
830 p->dynindx = ++dynsymcount;
833 elf_link_hash_traverse (elf_hash_table (info),
834 elf_link_renumber_hash_table_dynsyms,
837 /* There is an unused NULL entry at the head of the table which
838 we must account for in our count. Unless there weren't any
839 symbols, which means we'll have no table at all. */
840 if (dynsymcount != 0)
843 elf_hash_table (info)->dynsymcount = dynsymcount;
847 /* Merge st_other field. */
850 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
851 Elf_Internal_Sym *isym, bfd_boolean definition,
854 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
856 /* If st_other has a processor-specific meaning, specific
857 code might be needed here. We never merge the visibility
858 attribute with the one from a dynamic object. */
859 if (bed->elf_backend_merge_symbol_attribute)
860 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
863 /* If this symbol has default visibility and the user has requested
864 we not re-export it, then mark it as hidden. */
868 || (abfd->my_archive && abfd->my_archive->no_export))
869 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
870 isym->st_other = (STV_HIDDEN
871 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
873 if (!dynamic && ELF_ST_VISIBILITY (isym->st_other) != 0)
875 unsigned char hvis, symvis, other, nvis;
877 /* Only merge the visibility. Leave the remainder of the
878 st_other field to elf_backend_merge_symbol_attribute. */
879 other = h->other & ~ELF_ST_VISIBILITY (-1);
881 /* Combine visibilities, using the most constraining one. */
882 hvis = ELF_ST_VISIBILITY (h->other);
883 symvis = ELF_ST_VISIBILITY (isym->st_other);
889 nvis = hvis < symvis ? hvis : symvis;
891 h->other = other | nvis;
895 /* This function is called when we want to define a new symbol. It
896 handles the various cases which arise when we find a definition in
897 a dynamic object, or when there is already a definition in a
898 dynamic object. The new symbol is described by NAME, SYM, PSEC,
899 and PVALUE. We set SYM_HASH to the hash table entry. We set
900 OVERRIDE if the old symbol is overriding a new definition. We set
901 TYPE_CHANGE_OK if it is OK for the type to change. We set
902 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
903 change, we mean that we shouldn't warn if the type or size does
904 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
905 object is overridden by a regular object. */
908 _bfd_elf_merge_symbol (bfd *abfd,
909 struct bfd_link_info *info,
911 Elf_Internal_Sym *sym,
914 unsigned int *pold_alignment,
915 struct elf_link_hash_entry **sym_hash,
917 bfd_boolean *override,
918 bfd_boolean *type_change_ok,
919 bfd_boolean *size_change_ok)
921 asection *sec, *oldsec;
922 struct elf_link_hash_entry *h;
923 struct elf_link_hash_entry *flip;
926 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
927 bfd_boolean newweak, oldweak, newfunc, oldfunc;
928 const struct elf_backend_data *bed;
934 bind = ELF_ST_BIND (sym->st_info);
936 /* Silently discard TLS symbols from --just-syms. There's no way to
937 combine a static TLS block with a new TLS block for this executable. */
938 if (ELF_ST_TYPE (sym->st_info) == STT_TLS
939 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
945 if (! bfd_is_und_section (sec))
946 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
948 h = ((struct elf_link_hash_entry *)
949 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
954 bed = get_elf_backend_data (abfd);
956 /* This code is for coping with dynamic objects, and is only useful
957 if we are doing an ELF link. */
958 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
961 /* For merging, we only care about real symbols. */
963 while (h->root.type == bfd_link_hash_indirect
964 || h->root.type == bfd_link_hash_warning)
965 h = (struct elf_link_hash_entry *) h->root.u.i.link;
967 /* We have to check it for every instance since the first few may be
968 refereences and not all compilers emit symbol type for undefined
970 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
972 /* If we just created the symbol, mark it as being an ELF symbol.
973 Other than that, there is nothing to do--there is no merge issue
974 with a newly defined symbol--so we just return. */
976 if (h->root.type == bfd_link_hash_new)
982 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
985 switch (h->root.type)
992 case bfd_link_hash_undefined:
993 case bfd_link_hash_undefweak:
994 oldbfd = h->root.u.undef.abfd;
998 case bfd_link_hash_defined:
999 case bfd_link_hash_defweak:
1000 oldbfd = h->root.u.def.section->owner;
1001 oldsec = h->root.u.def.section;
1004 case bfd_link_hash_common:
1005 oldbfd = h->root.u.c.p->section->owner;
1006 oldsec = h->root.u.c.p->section;
1010 /* Differentiate strong and weak symbols. */
1011 newweak = bind == STB_WEAK;
1012 oldweak = (h->root.type == bfd_link_hash_defweak
1013 || h->root.type == bfd_link_hash_undefweak);
1015 /* In cases involving weak versioned symbols, we may wind up trying
1016 to merge a symbol with itself. Catch that here, to avoid the
1017 confusion that results if we try to override a symbol with
1018 itself. The additional tests catch cases like
1019 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1020 dynamic object, which we do want to handle here. */
1022 && (newweak || oldweak)
1023 && ((abfd->flags & DYNAMIC) == 0
1024 || !h->def_regular))
1027 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1028 respectively, is from a dynamic object. */
1030 newdyn = (abfd->flags & DYNAMIC) != 0;
1034 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1035 else if (oldsec != NULL)
1037 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1038 indices used by MIPS ELF. */
1039 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1042 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1043 respectively, appear to be a definition rather than reference. */
1045 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1047 olddef = (h->root.type != bfd_link_hash_undefined
1048 && h->root.type != bfd_link_hash_undefweak
1049 && h->root.type != bfd_link_hash_common);
1051 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1052 respectively, appear to be a function. */
1054 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1055 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1057 oldfunc = (h->type != STT_NOTYPE
1058 && bed->is_function_type (h->type));
1060 /* When we try to create a default indirect symbol from the dynamic
1061 definition with the default version, we skip it if its type and
1062 the type of existing regular definition mismatch. We only do it
1063 if the existing regular definition won't be dynamic. */
1064 if (pold_alignment == NULL
1066 && !info->export_dynamic
1071 && (olddef || h->root.type == bfd_link_hash_common)
1072 && ELF_ST_TYPE (sym->st_info) != h->type
1073 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1074 && h->type != STT_NOTYPE
1075 && !(newfunc && oldfunc))
1081 /* Plugin symbol type isn't currently set. Stop bogus errors. */
1082 if (oldbfd != NULL && (oldbfd->flags & BFD_PLUGIN) != 0)
1083 *type_change_ok = TRUE;
1085 /* Check TLS symbol. We don't check undefined symbol introduced by
1087 else if (oldbfd != NULL
1088 && ELF_ST_TYPE (sym->st_info) != h->type
1089 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1092 bfd_boolean ntdef, tdef;
1093 asection *ntsec, *tsec;
1095 if (h->type == STT_TLS)
1115 (*_bfd_error_handler)
1116 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1117 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1118 else if (!tdef && !ntdef)
1119 (*_bfd_error_handler)
1120 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1121 tbfd, ntbfd, h->root.root.string);
1123 (*_bfd_error_handler)
1124 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1125 tbfd, tsec, ntbfd, h->root.root.string);
1127 (*_bfd_error_handler)
1128 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1129 tbfd, ntbfd, ntsec, h->root.root.string);
1131 bfd_set_error (bfd_error_bad_value);
1135 /* We need to remember if a symbol has a definition in a dynamic
1136 object or is weak in all dynamic objects. Internal and hidden
1137 visibility will make it unavailable to dynamic objects. */
1138 if (newdyn && !h->dynamic_def)
1140 if (!bfd_is_und_section (sec))
1144 /* Check if this symbol is weak in all dynamic objects. If it
1145 is the first time we see it in a dynamic object, we mark
1146 if it is weak. Otherwise, we clear it. */
1147 if (!h->ref_dynamic)
1149 if (bind == STB_WEAK)
1150 h->dynamic_weak = 1;
1152 else if (bind != STB_WEAK)
1153 h->dynamic_weak = 0;
1157 /* If the old symbol has non-default visibility, we ignore the new
1158 definition from a dynamic object. */
1160 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1161 && !bfd_is_und_section (sec))
1164 /* Make sure this symbol is dynamic. */
1166 /* A protected symbol has external availability. Make sure it is
1167 recorded as dynamic.
1169 FIXME: Should we check type and size for protected symbol? */
1170 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1171 return bfd_elf_link_record_dynamic_symbol (info, h);
1176 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1179 /* If the new symbol with non-default visibility comes from a
1180 relocatable file and the old definition comes from a dynamic
1181 object, we remove the old definition. */
1182 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1184 /* Handle the case where the old dynamic definition is
1185 default versioned. We need to copy the symbol info from
1186 the symbol with default version to the normal one if it
1187 was referenced before. */
1190 struct elf_link_hash_entry *vh = *sym_hash;
1192 vh->root.type = h->root.type;
1193 h->root.type = bfd_link_hash_indirect;
1194 (*bed->elf_backend_copy_indirect_symbol) (info, vh, h);
1195 /* Protected symbols will override the dynamic definition
1196 with default version. */
1197 if (ELF_ST_VISIBILITY (sym->st_other) == STV_PROTECTED)
1199 h->root.u.i.link = (struct bfd_link_hash_entry *) vh;
1200 vh->dynamic_def = 1;
1201 vh->ref_dynamic = 1;
1205 h->root.type = vh->root.type;
1206 vh->ref_dynamic = 0;
1207 /* We have to hide it here since it was made dynamic
1208 global with extra bits when the symbol info was
1209 copied from the old dynamic definition. */
1210 (*bed->elf_backend_hide_symbol) (info, vh, TRUE);
1218 /* If the old symbol was undefined before, then it will still be
1219 on the undefs list. If the new symbol is undefined or
1220 common, we can't make it bfd_link_hash_new here, because new
1221 undefined or common symbols will be added to the undefs list
1222 by _bfd_generic_link_add_one_symbol. Symbols may not be
1223 added twice to the undefs list. Also, if the new symbol is
1224 undefweak then we don't want to lose the strong undef. */
1225 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1227 h->root.type = bfd_link_hash_undefined;
1228 h->root.u.undef.abfd = abfd;
1232 h->root.type = bfd_link_hash_new;
1233 h->root.u.undef.abfd = NULL;
1236 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1238 /* If the new symbol is hidden or internal, completely undo
1239 any dynamic link state. */
1240 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1241 h->forced_local = 0;
1248 /* FIXME: Should we check type and size for protected symbol? */
1254 if (bind == STB_GNU_UNIQUE)
1255 h->unique_global = 1;
1257 /* If a new weak symbol definition comes from a regular file and the
1258 old symbol comes from a dynamic library, we treat the new one as
1259 strong. Similarly, an old weak symbol definition from a regular
1260 file is treated as strong when the new symbol comes from a dynamic
1261 library. Further, an old weak symbol from a dynamic library is
1262 treated as strong if the new symbol is from a dynamic library.
1263 This reflects the way glibc's ld.so works.
1265 Do this before setting *type_change_ok or *size_change_ok so that
1266 we warn properly when dynamic library symbols are overridden. */
1268 if (newdef && !newdyn && olddyn)
1270 if (olddef && newdyn)
1273 /* Allow changes between different types of function symbol. */
1274 if (newfunc && oldfunc)
1275 *type_change_ok = TRUE;
1277 /* It's OK to change the type if either the existing symbol or the
1278 new symbol is weak. A type change is also OK if the old symbol
1279 is undefined and the new symbol is defined. */
1284 && h->root.type == bfd_link_hash_undefined))
1285 *type_change_ok = TRUE;
1287 /* It's OK to change the size if either the existing symbol or the
1288 new symbol is weak, or if the old symbol is undefined. */
1291 || h->root.type == bfd_link_hash_undefined)
1292 *size_change_ok = TRUE;
1294 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1295 symbol, respectively, appears to be a common symbol in a dynamic
1296 object. If a symbol appears in an uninitialized section, and is
1297 not weak, and is not a function, then it may be a common symbol
1298 which was resolved when the dynamic object was created. We want
1299 to treat such symbols specially, because they raise special
1300 considerations when setting the symbol size: if the symbol
1301 appears as a common symbol in a regular object, and the size in
1302 the regular object is larger, we must make sure that we use the
1303 larger size. This problematic case can always be avoided in C,
1304 but it must be handled correctly when using Fortran shared
1307 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1308 likewise for OLDDYNCOMMON and OLDDEF.
1310 Note that this test is just a heuristic, and that it is quite
1311 possible to have an uninitialized symbol in a shared object which
1312 is really a definition, rather than a common symbol. This could
1313 lead to some minor confusion when the symbol really is a common
1314 symbol in some regular object. However, I think it will be
1320 && (sec->flags & SEC_ALLOC) != 0
1321 && (sec->flags & SEC_LOAD) == 0
1324 newdyncommon = TRUE;
1326 newdyncommon = FALSE;
1330 && h->root.type == bfd_link_hash_defined
1332 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1333 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1336 olddyncommon = TRUE;
1338 olddyncommon = FALSE;
1340 /* We now know everything about the old and new symbols. We ask the
1341 backend to check if we can merge them. */
1342 if (bed->merge_symbol
1343 && !bed->merge_symbol (info, sym_hash, h, sym, psec, pvalue,
1344 pold_alignment, skip, override,
1345 type_change_ok, size_change_ok,
1346 &newdyn, &newdef, &newdyncommon, &newweak,
1348 &olddyn, &olddef, &olddyncommon, &oldweak,
1352 /* If both the old and the new symbols look like common symbols in a
1353 dynamic object, set the size of the symbol to the larger of the
1358 && sym->st_size != h->size)
1360 /* Since we think we have two common symbols, issue a multiple
1361 common warning if desired. Note that we only warn if the
1362 size is different. If the size is the same, we simply let
1363 the old symbol override the new one as normally happens with
1364 symbols defined in dynamic objects. */
1366 if (! ((*info->callbacks->multiple_common)
1367 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1370 if (sym->st_size > h->size)
1371 h->size = sym->st_size;
1373 *size_change_ok = TRUE;
1376 /* If we are looking at a dynamic object, and we have found a
1377 definition, we need to see if the symbol was already defined by
1378 some other object. If so, we want to use the existing
1379 definition, and we do not want to report a multiple symbol
1380 definition error; we do this by clobbering *PSEC to be
1381 bfd_und_section_ptr.
1383 We treat a common symbol as a definition if the symbol in the
1384 shared library is a function, since common symbols always
1385 represent variables; this can cause confusion in principle, but
1386 any such confusion would seem to indicate an erroneous program or
1387 shared library. We also permit a common symbol in a regular
1388 object to override a weak symbol in a shared object. */
1393 || (h->root.type == bfd_link_hash_common
1394 && (newweak || newfunc))))
1398 newdyncommon = FALSE;
1400 *psec = sec = bfd_und_section_ptr;
1401 *size_change_ok = TRUE;
1403 /* If we get here when the old symbol is a common symbol, then
1404 we are explicitly letting it override a weak symbol or
1405 function in a dynamic object, and we don't want to warn about
1406 a type change. If the old symbol is a defined symbol, a type
1407 change warning may still be appropriate. */
1409 if (h->root.type == bfd_link_hash_common)
1410 *type_change_ok = TRUE;
1413 /* Handle the special case of an old common symbol merging with a
1414 new symbol which looks like a common symbol in a shared object.
1415 We change *PSEC and *PVALUE to make the new symbol look like a
1416 common symbol, and let _bfd_generic_link_add_one_symbol do the
1420 && h->root.type == bfd_link_hash_common)
1424 newdyncommon = FALSE;
1425 *pvalue = sym->st_size;
1426 *psec = sec = bed->common_section (oldsec);
1427 *size_change_ok = TRUE;
1430 /* Skip weak definitions of symbols that are already defined. */
1431 if (newdef && olddef && newweak)
1433 /* Don't skip new non-IR weak syms. */
1434 if (!(oldbfd != NULL
1435 && (oldbfd->flags & BFD_PLUGIN) != 0
1436 && (abfd->flags & BFD_PLUGIN) == 0))
1439 /* Merge st_other. If the symbol already has a dynamic index,
1440 but visibility says it should not be visible, turn it into a
1442 elf_merge_st_other (abfd, h, sym, newdef, newdyn);
1443 if (h->dynindx != -1)
1444 switch (ELF_ST_VISIBILITY (h->other))
1448 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1453 /* If the old symbol is from a dynamic object, and the new symbol is
1454 a definition which is not from a dynamic object, then the new
1455 symbol overrides the old symbol. Symbols from regular files
1456 always take precedence over symbols from dynamic objects, even if
1457 they are defined after the dynamic object in the link.
1459 As above, we again permit a common symbol in a regular object to
1460 override a definition in a shared object if the shared object
1461 symbol is a function or is weak. */
1466 || (bfd_is_com_section (sec)
1467 && (oldweak || oldfunc)))
1472 /* Change the hash table entry to undefined, and let
1473 _bfd_generic_link_add_one_symbol do the right thing with the
1476 h->root.type = bfd_link_hash_undefined;
1477 h->root.u.undef.abfd = h->root.u.def.section->owner;
1478 *size_change_ok = TRUE;
1481 olddyncommon = FALSE;
1483 /* We again permit a type change when a common symbol may be
1484 overriding a function. */
1486 if (bfd_is_com_section (sec))
1490 /* If a common symbol overrides a function, make sure
1491 that it isn't defined dynamically nor has type
1494 h->type = STT_NOTYPE;
1496 *type_change_ok = TRUE;
1499 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1502 /* This union may have been set to be non-NULL when this symbol
1503 was seen in a dynamic object. We must force the union to be
1504 NULL, so that it is correct for a regular symbol. */
1505 h->verinfo.vertree = NULL;
1508 /* Handle the special case of a new common symbol merging with an
1509 old symbol that looks like it might be a common symbol defined in
1510 a shared object. Note that we have already handled the case in
1511 which a new common symbol should simply override the definition
1512 in the shared library. */
1515 && bfd_is_com_section (sec)
1518 /* It would be best if we could set the hash table entry to a
1519 common symbol, but we don't know what to use for the section
1520 or the alignment. */
1521 if (! ((*info->callbacks->multiple_common)
1522 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1525 /* If the presumed common symbol in the dynamic object is
1526 larger, pretend that the new symbol has its size. */
1528 if (h->size > *pvalue)
1531 /* We need to remember the alignment required by the symbol
1532 in the dynamic object. */
1533 BFD_ASSERT (pold_alignment);
1534 *pold_alignment = h->root.u.def.section->alignment_power;
1537 olddyncommon = FALSE;
1539 h->root.type = bfd_link_hash_undefined;
1540 h->root.u.undef.abfd = h->root.u.def.section->owner;
1542 *size_change_ok = TRUE;
1543 *type_change_ok = TRUE;
1545 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1548 h->verinfo.vertree = NULL;
1553 /* Handle the case where we had a versioned symbol in a dynamic
1554 library and now find a definition in a normal object. In this
1555 case, we make the versioned symbol point to the normal one. */
1556 flip->root.type = h->root.type;
1557 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1558 h->root.type = bfd_link_hash_indirect;
1559 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1560 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1564 flip->ref_dynamic = 1;
1571 /* This function is called to create an indirect symbol from the
1572 default for the symbol with the default version if needed. The
1573 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1574 set DYNSYM if the new indirect symbol is dynamic. */
1577 _bfd_elf_add_default_symbol (bfd *abfd,
1578 struct bfd_link_info *info,
1579 struct elf_link_hash_entry *h,
1581 Elf_Internal_Sym *sym,
1584 bfd_boolean *dynsym,
1585 bfd_boolean override)
1587 bfd_boolean type_change_ok;
1588 bfd_boolean size_change_ok;
1591 struct elf_link_hash_entry *hi;
1592 struct bfd_link_hash_entry *bh;
1593 const struct elf_backend_data *bed;
1594 bfd_boolean collect;
1595 bfd_boolean dynamic;
1597 size_t len, shortlen;
1600 /* If this symbol has a version, and it is the default version, we
1601 create an indirect symbol from the default name to the fully
1602 decorated name. This will cause external references which do not
1603 specify a version to be bound to this version of the symbol. */
1604 p = strchr (name, ELF_VER_CHR);
1605 if (p == NULL || p[1] != ELF_VER_CHR)
1610 /* We are overridden by an old definition. We need to check if we
1611 need to create the indirect symbol from the default name. */
1612 hi = elf_link_hash_lookup (elf_hash_table (info), name, TRUE,
1614 BFD_ASSERT (hi != NULL);
1617 while (hi->root.type == bfd_link_hash_indirect
1618 || hi->root.type == bfd_link_hash_warning)
1620 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1626 bed = get_elf_backend_data (abfd);
1627 collect = bed->collect;
1628 dynamic = (abfd->flags & DYNAMIC) != 0;
1630 shortlen = p - name;
1631 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1632 if (shortname == NULL)
1634 memcpy (shortname, name, shortlen);
1635 shortname[shortlen] = '\0';
1637 /* We are going to create a new symbol. Merge it with any existing
1638 symbol with this name. For the purposes of the merge, act as
1639 though we were defining the symbol we just defined, although we
1640 actually going to define an indirect symbol. */
1641 type_change_ok = FALSE;
1642 size_change_ok = FALSE;
1644 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1645 NULL, &hi, &skip, &override,
1646 &type_change_ok, &size_change_ok))
1655 if (! (_bfd_generic_link_add_one_symbol
1656 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1657 0, name, FALSE, collect, &bh)))
1659 hi = (struct elf_link_hash_entry *) bh;
1663 /* In this case the symbol named SHORTNAME is overriding the
1664 indirect symbol we want to add. We were planning on making
1665 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1666 is the name without a version. NAME is the fully versioned
1667 name, and it is the default version.
1669 Overriding means that we already saw a definition for the
1670 symbol SHORTNAME in a regular object, and it is overriding
1671 the symbol defined in the dynamic object.
1673 When this happens, we actually want to change NAME, the
1674 symbol we just added, to refer to SHORTNAME. This will cause
1675 references to NAME in the shared object to become references
1676 to SHORTNAME in the regular object. This is what we expect
1677 when we override a function in a shared object: that the
1678 references in the shared object will be mapped to the
1679 definition in the regular object. */
1681 while (hi->root.type == bfd_link_hash_indirect
1682 || hi->root.type == bfd_link_hash_warning)
1683 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1685 h->root.type = bfd_link_hash_indirect;
1686 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1690 hi->ref_dynamic = 1;
1694 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1699 /* Now set HI to H, so that the following code will set the
1700 other fields correctly. */
1704 /* Check if HI is a warning symbol. */
1705 if (hi->root.type == bfd_link_hash_warning)
1706 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1708 /* If there is a duplicate definition somewhere, then HI may not
1709 point to an indirect symbol. We will have reported an error to
1710 the user in that case. */
1712 if (hi->root.type == bfd_link_hash_indirect)
1714 struct elf_link_hash_entry *ht;
1716 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1717 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1719 /* See if the new flags lead us to realize that the symbol must
1725 if (! info->executable
1731 if (hi->ref_regular)
1737 /* We also need to define an indirection from the nondefault version
1741 len = strlen (name);
1742 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1743 if (shortname == NULL)
1745 memcpy (shortname, name, shortlen);
1746 memcpy (shortname + shortlen, p + 1, len - shortlen);
1748 /* Once again, merge with any existing symbol. */
1749 type_change_ok = FALSE;
1750 size_change_ok = FALSE;
1752 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1753 NULL, &hi, &skip, &override,
1754 &type_change_ok, &size_change_ok))
1762 /* Here SHORTNAME is a versioned name, so we don't expect to see
1763 the type of override we do in the case above unless it is
1764 overridden by a versioned definition. */
1765 if (hi->root.type != bfd_link_hash_defined
1766 && hi->root.type != bfd_link_hash_defweak)
1767 (*_bfd_error_handler)
1768 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1774 if (! (_bfd_generic_link_add_one_symbol
1775 (info, abfd, shortname, BSF_INDIRECT,
1776 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1778 hi = (struct elf_link_hash_entry *) bh;
1780 /* If there is a duplicate definition somewhere, then HI may not
1781 point to an indirect symbol. We will have reported an error
1782 to the user in that case. */
1784 if (hi->root.type == bfd_link_hash_indirect)
1786 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1788 /* See if the new flags lead us to realize that the symbol
1794 if (! info->executable
1800 if (hi->ref_regular)
1810 /* This routine is used to export all defined symbols into the dynamic
1811 symbol table. It is called via elf_link_hash_traverse. */
1814 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1816 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1818 /* Ignore indirect symbols. These are added by the versioning code. */
1819 if (h->root.type == bfd_link_hash_indirect)
1822 /* Ignore this if we won't export it. */
1823 if (!eif->info->export_dynamic && !h->dynamic)
1826 if (h->dynindx == -1
1827 && (h->def_regular || h->ref_regular)
1828 && ! bfd_hide_sym_by_version (eif->info->version_info,
1829 h->root.root.string))
1831 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1841 /* Look through the symbols which are defined in other shared
1842 libraries and referenced here. Update the list of version
1843 dependencies. This will be put into the .gnu.version_r section.
1844 This function is called via elf_link_hash_traverse. */
1847 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1850 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1851 Elf_Internal_Verneed *t;
1852 Elf_Internal_Vernaux *a;
1855 /* We only care about symbols defined in shared objects with version
1860 || h->verinfo.verdef == NULL)
1863 /* See if we already know about this version. */
1864 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1868 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1871 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1872 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1878 /* This is a new version. Add it to tree we are building. */
1883 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1886 rinfo->failed = TRUE;
1890 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1891 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1892 elf_tdata (rinfo->info->output_bfd)->verref = t;
1896 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1899 rinfo->failed = TRUE;
1903 /* Note that we are copying a string pointer here, and testing it
1904 above. If bfd_elf_string_from_elf_section is ever changed to
1905 discard the string data when low in memory, this will have to be
1907 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1909 a->vna_flags = h->verinfo.verdef->vd_flags;
1910 a->vna_nextptr = t->vn_auxptr;
1912 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1915 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1922 /* Figure out appropriate versions for all the symbols. We may not
1923 have the version number script until we have read all of the input
1924 files, so until that point we don't know which symbols should be
1925 local. This function is called via elf_link_hash_traverse. */
1928 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1930 struct elf_info_failed *sinfo;
1931 struct bfd_link_info *info;
1932 const struct elf_backend_data *bed;
1933 struct elf_info_failed eif;
1937 sinfo = (struct elf_info_failed *) data;
1940 /* Fix the symbol flags. */
1943 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1946 sinfo->failed = TRUE;
1950 /* We only need version numbers for symbols defined in regular
1952 if (!h->def_regular)
1955 bed = get_elf_backend_data (info->output_bfd);
1956 p = strchr (h->root.root.string, ELF_VER_CHR);
1957 if (p != NULL && h->verinfo.vertree == NULL)
1959 struct bfd_elf_version_tree *t;
1964 /* There are two consecutive ELF_VER_CHR characters if this is
1965 not a hidden symbol. */
1967 if (*p == ELF_VER_CHR)
1973 /* If there is no version string, we can just return out. */
1981 /* Look for the version. If we find it, it is no longer weak. */
1982 for (t = sinfo->info->version_info; t != NULL; t = t->next)
1984 if (strcmp (t->name, p) == 0)
1988 struct bfd_elf_version_expr *d;
1990 len = p - h->root.root.string;
1991 alc = (char *) bfd_malloc (len);
1994 sinfo->failed = TRUE;
1997 memcpy (alc, h->root.root.string, len - 1);
1998 alc[len - 1] = '\0';
1999 if (alc[len - 2] == ELF_VER_CHR)
2000 alc[len - 2] = '\0';
2002 h->verinfo.vertree = t;
2006 if (t->globals.list != NULL)
2007 d = (*t->match) (&t->globals, NULL, alc);
2009 /* See if there is anything to force this symbol to
2011 if (d == NULL && t->locals.list != NULL)
2013 d = (*t->match) (&t->locals, NULL, alc);
2016 && ! info->export_dynamic)
2017 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2025 /* If we are building an application, we need to create a
2026 version node for this version. */
2027 if (t == NULL && info->executable)
2029 struct bfd_elf_version_tree **pp;
2032 /* If we aren't going to export this symbol, we don't need
2033 to worry about it. */
2034 if (h->dynindx == -1)
2038 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2041 sinfo->failed = TRUE;
2046 t->name_indx = (unsigned int) -1;
2050 /* Don't count anonymous version tag. */
2051 if (sinfo->info->version_info != NULL
2052 && sinfo->info->version_info->vernum == 0)
2054 for (pp = &sinfo->info->version_info;
2058 t->vernum = version_index;
2062 h->verinfo.vertree = t;
2066 /* We could not find the version for a symbol when
2067 generating a shared archive. Return an error. */
2068 (*_bfd_error_handler)
2069 (_("%B: version node not found for symbol %s"),
2070 info->output_bfd, h->root.root.string);
2071 bfd_set_error (bfd_error_bad_value);
2072 sinfo->failed = TRUE;
2080 /* If we don't have a version for this symbol, see if we can find
2082 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2087 = bfd_find_version_for_sym (sinfo->info->version_info,
2088 h->root.root.string, &hide);
2089 if (h->verinfo.vertree != NULL && hide)
2090 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2096 /* Read and swap the relocs from the section indicated by SHDR. This
2097 may be either a REL or a RELA section. The relocations are
2098 translated into RELA relocations and stored in INTERNAL_RELOCS,
2099 which should have already been allocated to contain enough space.
2100 The EXTERNAL_RELOCS are a buffer where the external form of the
2101 relocations should be stored.
2103 Returns FALSE if something goes wrong. */
2106 elf_link_read_relocs_from_section (bfd *abfd,
2108 Elf_Internal_Shdr *shdr,
2109 void *external_relocs,
2110 Elf_Internal_Rela *internal_relocs)
2112 const struct elf_backend_data *bed;
2113 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2114 const bfd_byte *erela;
2115 const bfd_byte *erelaend;
2116 Elf_Internal_Rela *irela;
2117 Elf_Internal_Shdr *symtab_hdr;
2120 /* Position ourselves at the start of the section. */
2121 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2124 /* Read the relocations. */
2125 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2128 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2129 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2131 bed = get_elf_backend_data (abfd);
2133 /* Convert the external relocations to the internal format. */
2134 if (shdr->sh_entsize == bed->s->sizeof_rel)
2135 swap_in = bed->s->swap_reloc_in;
2136 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2137 swap_in = bed->s->swap_reloca_in;
2140 bfd_set_error (bfd_error_wrong_format);
2144 erela = (const bfd_byte *) external_relocs;
2145 erelaend = erela + shdr->sh_size;
2146 irela = internal_relocs;
2147 while (erela < erelaend)
2151 (*swap_in) (abfd, erela, irela);
2152 r_symndx = ELF32_R_SYM (irela->r_info);
2153 if (bed->s->arch_size == 64)
2157 if ((size_t) r_symndx >= nsyms)
2159 (*_bfd_error_handler)
2160 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2161 " for offset 0x%lx in section `%A'"),
2163 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2164 bfd_set_error (bfd_error_bad_value);
2168 else if (r_symndx != STN_UNDEF)
2170 (*_bfd_error_handler)
2171 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2172 " when the object file has no symbol table"),
2174 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2175 bfd_set_error (bfd_error_bad_value);
2178 irela += bed->s->int_rels_per_ext_rel;
2179 erela += shdr->sh_entsize;
2185 /* Read and swap the relocs for a section O. They may have been
2186 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2187 not NULL, they are used as buffers to read into. They are known to
2188 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2189 the return value is allocated using either malloc or bfd_alloc,
2190 according to the KEEP_MEMORY argument. If O has two relocation
2191 sections (both REL and RELA relocations), then the REL_HDR
2192 relocations will appear first in INTERNAL_RELOCS, followed by the
2193 RELA_HDR relocations. */
2196 _bfd_elf_link_read_relocs (bfd *abfd,
2198 void *external_relocs,
2199 Elf_Internal_Rela *internal_relocs,
2200 bfd_boolean keep_memory)
2202 void *alloc1 = NULL;
2203 Elf_Internal_Rela *alloc2 = NULL;
2204 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2205 struct bfd_elf_section_data *esdo = elf_section_data (o);
2206 Elf_Internal_Rela *internal_rela_relocs;
2208 if (esdo->relocs != NULL)
2209 return esdo->relocs;
2211 if (o->reloc_count == 0)
2214 if (internal_relocs == NULL)
2218 size = o->reloc_count;
2219 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2221 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2223 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2224 if (internal_relocs == NULL)
2228 if (external_relocs == NULL)
2230 bfd_size_type size = 0;
2233 size += esdo->rel.hdr->sh_size;
2235 size += esdo->rela.hdr->sh_size;
2237 alloc1 = bfd_malloc (size);
2240 external_relocs = alloc1;
2243 internal_rela_relocs = internal_relocs;
2246 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2250 external_relocs = (((bfd_byte *) external_relocs)
2251 + esdo->rel.hdr->sh_size);
2252 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2253 * bed->s->int_rels_per_ext_rel);
2257 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2259 internal_rela_relocs)))
2262 /* Cache the results for next time, if we can. */
2264 esdo->relocs = internal_relocs;
2269 /* Don't free alloc2, since if it was allocated we are passing it
2270 back (under the name of internal_relocs). */
2272 return internal_relocs;
2280 bfd_release (abfd, alloc2);
2287 /* Compute the size of, and allocate space for, REL_HDR which is the
2288 section header for a section containing relocations for O. */
2291 _bfd_elf_link_size_reloc_section (bfd *abfd,
2292 struct bfd_elf_section_reloc_data *reldata)
2294 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2296 /* That allows us to calculate the size of the section. */
2297 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2299 /* The contents field must last into write_object_contents, so we
2300 allocate it with bfd_alloc rather than malloc. Also since we
2301 cannot be sure that the contents will actually be filled in,
2302 we zero the allocated space. */
2303 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2304 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2307 if (reldata->hashes == NULL && reldata->count)
2309 struct elf_link_hash_entry **p;
2311 p = (struct elf_link_hash_entry **)
2312 bfd_zmalloc (reldata->count * sizeof (struct elf_link_hash_entry *));
2316 reldata->hashes = p;
2322 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2323 originated from the section given by INPUT_REL_HDR) to the
2327 _bfd_elf_link_output_relocs (bfd *output_bfd,
2328 asection *input_section,
2329 Elf_Internal_Shdr *input_rel_hdr,
2330 Elf_Internal_Rela *internal_relocs,
2331 struct elf_link_hash_entry **rel_hash
2334 Elf_Internal_Rela *irela;
2335 Elf_Internal_Rela *irelaend;
2337 struct bfd_elf_section_reloc_data *output_reldata;
2338 asection *output_section;
2339 const struct elf_backend_data *bed;
2340 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2341 struct bfd_elf_section_data *esdo;
2343 output_section = input_section->output_section;
2345 bed = get_elf_backend_data (output_bfd);
2346 esdo = elf_section_data (output_section);
2347 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2349 output_reldata = &esdo->rel;
2350 swap_out = bed->s->swap_reloc_out;
2352 else if (esdo->rela.hdr
2353 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2355 output_reldata = &esdo->rela;
2356 swap_out = bed->s->swap_reloca_out;
2360 (*_bfd_error_handler)
2361 (_("%B: relocation size mismatch in %B section %A"),
2362 output_bfd, input_section->owner, input_section);
2363 bfd_set_error (bfd_error_wrong_format);
2367 erel = output_reldata->hdr->contents;
2368 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2369 irela = internal_relocs;
2370 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2371 * bed->s->int_rels_per_ext_rel);
2372 while (irela < irelaend)
2374 (*swap_out) (output_bfd, irela, erel);
2375 irela += bed->s->int_rels_per_ext_rel;
2376 erel += input_rel_hdr->sh_entsize;
2379 /* Bump the counter, so that we know where to add the next set of
2381 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2386 /* Make weak undefined symbols in PIE dynamic. */
2389 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2390 struct elf_link_hash_entry *h)
2394 && h->root.type == bfd_link_hash_undefweak)
2395 return bfd_elf_link_record_dynamic_symbol (info, h);
2400 /* Fix up the flags for a symbol. This handles various cases which
2401 can only be fixed after all the input files are seen. This is
2402 currently called by both adjust_dynamic_symbol and
2403 assign_sym_version, which is unnecessary but perhaps more robust in
2404 the face of future changes. */
2407 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2408 struct elf_info_failed *eif)
2410 const struct elf_backend_data *bed;
2412 /* If this symbol was mentioned in a non-ELF file, try to set
2413 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2414 permit a non-ELF file to correctly refer to a symbol defined in
2415 an ELF dynamic object. */
2418 while (h->root.type == bfd_link_hash_indirect)
2419 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2421 if (h->root.type != bfd_link_hash_defined
2422 && h->root.type != bfd_link_hash_defweak)
2425 h->ref_regular_nonweak = 1;
2429 if (h->root.u.def.section->owner != NULL
2430 && (bfd_get_flavour (h->root.u.def.section->owner)
2431 == bfd_target_elf_flavour))
2434 h->ref_regular_nonweak = 1;
2440 if (h->dynindx == -1
2444 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2453 /* Unfortunately, NON_ELF is only correct if the symbol
2454 was first seen in a non-ELF file. Fortunately, if the symbol
2455 was first seen in an ELF file, we're probably OK unless the
2456 symbol was defined in a non-ELF file. Catch that case here.
2457 FIXME: We're still in trouble if the symbol was first seen in
2458 a dynamic object, and then later in a non-ELF regular object. */
2459 if ((h->root.type == bfd_link_hash_defined
2460 || h->root.type == bfd_link_hash_defweak)
2462 && (h->root.u.def.section->owner != NULL
2463 ? (bfd_get_flavour (h->root.u.def.section->owner)
2464 != bfd_target_elf_flavour)
2465 : (bfd_is_abs_section (h->root.u.def.section)
2466 && !h->def_dynamic)))
2470 /* Backend specific symbol fixup. */
2471 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2472 if (bed->elf_backend_fixup_symbol
2473 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2476 /* If this is a final link, and the symbol was defined as a common
2477 symbol in a regular object file, and there was no definition in
2478 any dynamic object, then the linker will have allocated space for
2479 the symbol in a common section but the DEF_REGULAR
2480 flag will not have been set. */
2481 if (h->root.type == bfd_link_hash_defined
2485 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
2488 /* If -Bsymbolic was used (which means to bind references to global
2489 symbols to the definition within the shared object), and this
2490 symbol was defined in a regular object, then it actually doesn't
2491 need a PLT entry. Likewise, if the symbol has non-default
2492 visibility. If the symbol has hidden or internal visibility, we
2493 will force it local. */
2495 && eif->info->shared
2496 && is_elf_hash_table (eif->info->hash)
2497 && (SYMBOLIC_BIND (eif->info, h)
2498 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2501 bfd_boolean force_local;
2503 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2504 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2505 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2508 /* If a weak undefined symbol has non-default visibility, we also
2509 hide it from the dynamic linker. */
2510 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2511 && h->root.type == bfd_link_hash_undefweak)
2512 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2514 /* If this is a weak defined symbol in a dynamic object, and we know
2515 the real definition in the dynamic object, copy interesting flags
2516 over to the real definition. */
2517 if (h->u.weakdef != NULL)
2519 /* If the real definition is defined by a regular object file,
2520 don't do anything special. See the longer description in
2521 _bfd_elf_adjust_dynamic_symbol, below. */
2522 if (h->u.weakdef->def_regular)
2523 h->u.weakdef = NULL;
2526 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2528 while (h->root.type == bfd_link_hash_indirect)
2529 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2531 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2532 || h->root.type == bfd_link_hash_defweak);
2533 BFD_ASSERT (weakdef->def_dynamic);
2534 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2535 || weakdef->root.type == bfd_link_hash_defweak);
2536 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2543 /* Make the backend pick a good value for a dynamic symbol. This is
2544 called via elf_link_hash_traverse, and also calls itself
2548 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2550 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2552 const struct elf_backend_data *bed;
2554 if (! is_elf_hash_table (eif->info->hash))
2557 /* Ignore indirect symbols. These are added by the versioning code. */
2558 if (h->root.type == bfd_link_hash_indirect)
2561 /* Fix the symbol flags. */
2562 if (! _bfd_elf_fix_symbol_flags (h, eif))
2565 /* If this symbol does not require a PLT entry, and it is not
2566 defined by a dynamic object, or is not referenced by a regular
2567 object, ignore it. We do have to handle a weak defined symbol,
2568 even if no regular object refers to it, if we decided to add it
2569 to the dynamic symbol table. FIXME: Do we normally need to worry
2570 about symbols which are defined by one dynamic object and
2571 referenced by another one? */
2573 && h->type != STT_GNU_IFUNC
2577 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2579 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2583 /* If we've already adjusted this symbol, don't do it again. This
2584 can happen via a recursive call. */
2585 if (h->dynamic_adjusted)
2588 /* Don't look at this symbol again. Note that we must set this
2589 after checking the above conditions, because we may look at a
2590 symbol once, decide not to do anything, and then get called
2591 recursively later after REF_REGULAR is set below. */
2592 h->dynamic_adjusted = 1;
2594 /* If this is a weak definition, and we know a real definition, and
2595 the real symbol is not itself defined by a regular object file,
2596 then get a good value for the real definition. We handle the
2597 real symbol first, for the convenience of the backend routine.
2599 Note that there is a confusing case here. If the real definition
2600 is defined by a regular object file, we don't get the real symbol
2601 from the dynamic object, but we do get the weak symbol. If the
2602 processor backend uses a COPY reloc, then if some routine in the
2603 dynamic object changes the real symbol, we will not see that
2604 change in the corresponding weak symbol. This is the way other
2605 ELF linkers work as well, and seems to be a result of the shared
2608 I will clarify this issue. Most SVR4 shared libraries define the
2609 variable _timezone and define timezone as a weak synonym. The
2610 tzset call changes _timezone. If you write
2611 extern int timezone;
2613 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2614 you might expect that, since timezone is a synonym for _timezone,
2615 the same number will print both times. However, if the processor
2616 backend uses a COPY reloc, then actually timezone will be copied
2617 into your process image, and, since you define _timezone
2618 yourself, _timezone will not. Thus timezone and _timezone will
2619 wind up at different memory locations. The tzset call will set
2620 _timezone, leaving timezone unchanged. */
2622 if (h->u.weakdef != NULL)
2624 /* If we get to this point, there is an implicit reference to
2625 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2626 h->u.weakdef->ref_regular = 1;
2628 /* Ensure that the backend adjust_dynamic_symbol function sees
2629 H->U.WEAKDEF before H by recursively calling ourselves. */
2630 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2634 /* If a symbol has no type and no size and does not require a PLT
2635 entry, then we are probably about to do the wrong thing here: we
2636 are probably going to create a COPY reloc for an empty object.
2637 This case can arise when a shared object is built with assembly
2638 code, and the assembly code fails to set the symbol type. */
2640 && h->type == STT_NOTYPE
2642 (*_bfd_error_handler)
2643 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2644 h->root.root.string);
2646 dynobj = elf_hash_table (eif->info)->dynobj;
2647 bed = get_elf_backend_data (dynobj);
2649 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2658 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2662 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
2665 unsigned int power_of_two;
2667 asection *sec = h->root.u.def.section;
2669 /* The section aligment of definition is the maximum alignment
2670 requirement of symbols defined in the section. Since we don't
2671 know the symbol alignment requirement, we start with the
2672 maximum alignment and check low bits of the symbol address
2673 for the minimum alignment. */
2674 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2675 mask = ((bfd_vma) 1 << power_of_two) - 1;
2676 while ((h->root.u.def.value & mask) != 0)
2682 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2685 /* Adjust the section alignment if needed. */
2686 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2691 /* We make sure that the symbol will be aligned properly. */
2692 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2694 /* Define the symbol as being at this point in DYNBSS. */
2695 h->root.u.def.section = dynbss;
2696 h->root.u.def.value = dynbss->size;
2698 /* Increment the size of DYNBSS to make room for the symbol. */
2699 dynbss->size += h->size;
2704 /* Adjust all external symbols pointing into SEC_MERGE sections
2705 to reflect the object merging within the sections. */
2708 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2712 if ((h->root.type == bfd_link_hash_defined
2713 || h->root.type == bfd_link_hash_defweak)
2714 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2715 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2717 bfd *output_bfd = (bfd *) data;
2719 h->root.u.def.value =
2720 _bfd_merged_section_offset (output_bfd,
2721 &h->root.u.def.section,
2722 elf_section_data (sec)->sec_info,
2723 h->root.u.def.value);
2729 /* Returns false if the symbol referred to by H should be considered
2730 to resolve local to the current module, and true if it should be
2731 considered to bind dynamically. */
2734 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2735 struct bfd_link_info *info,
2736 bfd_boolean not_local_protected)
2738 bfd_boolean binding_stays_local_p;
2739 const struct elf_backend_data *bed;
2740 struct elf_link_hash_table *hash_table;
2745 while (h->root.type == bfd_link_hash_indirect
2746 || h->root.type == bfd_link_hash_warning)
2747 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2749 /* If it was forced local, then clearly it's not dynamic. */
2750 if (h->dynindx == -1)
2752 if (h->forced_local)
2755 /* Identify the cases where name binding rules say that a
2756 visible symbol resolves locally. */
2757 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2759 switch (ELF_ST_VISIBILITY (h->other))
2766 hash_table = elf_hash_table (info);
2767 if (!is_elf_hash_table (hash_table))
2770 bed = get_elf_backend_data (hash_table->dynobj);
2772 /* Proper resolution for function pointer equality may require
2773 that these symbols perhaps be resolved dynamically, even though
2774 we should be resolving them to the current module. */
2775 if (!not_local_protected || !bed->is_function_type (h->type))
2776 binding_stays_local_p = TRUE;
2783 /* If it isn't defined locally, then clearly it's dynamic. */
2784 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2787 /* Otherwise, the symbol is dynamic if binding rules don't tell
2788 us that it remains local. */
2789 return !binding_stays_local_p;
2792 /* Return true if the symbol referred to by H should be considered
2793 to resolve local to the current module, and false otherwise. Differs
2794 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2795 undefined symbols. The two functions are virtually identical except
2796 for the place where forced_local and dynindx == -1 are tested. If
2797 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2798 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2799 the symbol is local only for defined symbols.
2800 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2801 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2802 treatment of undefined weak symbols. For those that do not make
2803 undefined weak symbols dynamic, both functions may return false. */
2806 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2807 struct bfd_link_info *info,
2808 bfd_boolean local_protected)
2810 const struct elf_backend_data *bed;
2811 struct elf_link_hash_table *hash_table;
2813 /* If it's a local sym, of course we resolve locally. */
2817 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2818 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2819 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2822 /* Common symbols that become definitions don't get the DEF_REGULAR
2823 flag set, so test it first, and don't bail out. */
2824 if (ELF_COMMON_DEF_P (h))
2826 /* If we don't have a definition in a regular file, then we can't
2827 resolve locally. The sym is either undefined or dynamic. */
2828 else if (!h->def_regular)
2831 /* Forced local symbols resolve locally. */
2832 if (h->forced_local)
2835 /* As do non-dynamic symbols. */
2836 if (h->dynindx == -1)
2839 /* At this point, we know the symbol is defined and dynamic. In an
2840 executable it must resolve locally, likewise when building symbolic
2841 shared libraries. */
2842 if (info->executable || SYMBOLIC_BIND (info, h))
2845 /* Now deal with defined dynamic symbols in shared libraries. Ones
2846 with default visibility might not resolve locally. */
2847 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2850 hash_table = elf_hash_table (info);
2851 if (!is_elf_hash_table (hash_table))
2854 bed = get_elf_backend_data (hash_table->dynobj);
2856 /* STV_PROTECTED non-function symbols are local. */
2857 if (!bed->is_function_type (h->type))
2860 /* Function pointer equality tests may require that STV_PROTECTED
2861 symbols be treated as dynamic symbols. If the address of a
2862 function not defined in an executable is set to that function's
2863 plt entry in the executable, then the address of the function in
2864 a shared library must also be the plt entry in the executable. */
2865 return local_protected;
2868 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2869 aligned. Returns the first TLS output section. */
2871 struct bfd_section *
2872 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2874 struct bfd_section *sec, *tls;
2875 unsigned int align = 0;
2877 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2878 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2882 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2883 if (sec->alignment_power > align)
2884 align = sec->alignment_power;
2886 elf_hash_table (info)->tls_sec = tls;
2888 /* Ensure the alignment of the first section is the largest alignment,
2889 so that the tls segment starts aligned. */
2891 tls->alignment_power = align;
2896 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2898 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2899 Elf_Internal_Sym *sym)
2901 const struct elf_backend_data *bed;
2903 /* Local symbols do not count, but target specific ones might. */
2904 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2905 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2908 bed = get_elf_backend_data (abfd);
2909 /* Function symbols do not count. */
2910 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2913 /* If the section is undefined, then so is the symbol. */
2914 if (sym->st_shndx == SHN_UNDEF)
2917 /* If the symbol is defined in the common section, then
2918 it is a common definition and so does not count. */
2919 if (bed->common_definition (sym))
2922 /* If the symbol is in a target specific section then we
2923 must rely upon the backend to tell us what it is. */
2924 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2925 /* FIXME - this function is not coded yet:
2927 return _bfd_is_global_symbol_definition (abfd, sym);
2929 Instead for now assume that the definition is not global,
2930 Even if this is wrong, at least the linker will behave
2931 in the same way that it used to do. */
2937 /* Search the symbol table of the archive element of the archive ABFD
2938 whose archive map contains a mention of SYMDEF, and determine if
2939 the symbol is defined in this element. */
2941 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2943 Elf_Internal_Shdr * hdr;
2944 bfd_size_type symcount;
2945 bfd_size_type extsymcount;
2946 bfd_size_type extsymoff;
2947 Elf_Internal_Sym *isymbuf;
2948 Elf_Internal_Sym *isym;
2949 Elf_Internal_Sym *isymend;
2952 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2956 if (! bfd_check_format (abfd, bfd_object))
2959 /* If we have already included the element containing this symbol in the
2960 link then we do not need to include it again. Just claim that any symbol
2961 it contains is not a definition, so that our caller will not decide to
2962 (re)include this element. */
2963 if (abfd->archive_pass)
2966 /* Select the appropriate symbol table. */
2967 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2968 hdr = &elf_tdata (abfd)->symtab_hdr;
2970 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2972 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2974 /* The sh_info field of the symtab header tells us where the
2975 external symbols start. We don't care about the local symbols. */
2976 if (elf_bad_symtab (abfd))
2978 extsymcount = symcount;
2983 extsymcount = symcount - hdr->sh_info;
2984 extsymoff = hdr->sh_info;
2987 if (extsymcount == 0)
2990 /* Read in the symbol table. */
2991 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2993 if (isymbuf == NULL)
2996 /* Scan the symbol table looking for SYMDEF. */
2998 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
3002 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3007 if (strcmp (name, symdef->name) == 0)
3009 result = is_global_data_symbol_definition (abfd, isym);
3019 /* Add an entry to the .dynamic table. */
3022 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3026 struct elf_link_hash_table *hash_table;
3027 const struct elf_backend_data *bed;
3029 bfd_size_type newsize;
3030 bfd_byte *newcontents;
3031 Elf_Internal_Dyn dyn;
3033 hash_table = elf_hash_table (info);
3034 if (! is_elf_hash_table (hash_table))
3037 bed = get_elf_backend_data (hash_table->dynobj);
3038 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3039 BFD_ASSERT (s != NULL);
3041 newsize = s->size + bed->s->sizeof_dyn;
3042 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3043 if (newcontents == NULL)
3047 dyn.d_un.d_val = val;
3048 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3051 s->contents = newcontents;
3056 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3057 otherwise just check whether one already exists. Returns -1 on error,
3058 1 if a DT_NEEDED tag already exists, and 0 on success. */
3061 elf_add_dt_needed_tag (bfd *abfd,
3062 struct bfd_link_info *info,
3066 struct elf_link_hash_table *hash_table;
3067 bfd_size_type oldsize;
3068 bfd_size_type strindex;
3070 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3073 hash_table = elf_hash_table (info);
3074 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
3075 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3076 if (strindex == (bfd_size_type) -1)
3079 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
3082 const struct elf_backend_data *bed;
3085 bed = get_elf_backend_data (hash_table->dynobj);
3086 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3088 for (extdyn = sdyn->contents;
3089 extdyn < sdyn->contents + sdyn->size;
3090 extdyn += bed->s->sizeof_dyn)
3092 Elf_Internal_Dyn dyn;
3094 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3095 if (dyn.d_tag == DT_NEEDED
3096 && dyn.d_un.d_val == strindex)
3098 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3106 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3109 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3113 /* We were just checking for existence of the tag. */
3114 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3120 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3122 for (; needed != NULL; needed = needed->next)
3123 if (strcmp (soname, needed->name) == 0)
3129 /* Sort symbol by value and section. */
3131 elf_sort_symbol (const void *arg1, const void *arg2)
3133 const struct elf_link_hash_entry *h1;
3134 const struct elf_link_hash_entry *h2;
3135 bfd_signed_vma vdiff;
3137 h1 = *(const struct elf_link_hash_entry **) arg1;
3138 h2 = *(const struct elf_link_hash_entry **) arg2;
3139 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3141 return vdiff > 0 ? 1 : -1;
3144 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3146 return sdiff > 0 ? 1 : -1;
3151 /* This function is used to adjust offsets into .dynstr for
3152 dynamic symbols. This is called via elf_link_hash_traverse. */
3155 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3157 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3159 if (h->dynindx != -1)
3160 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3164 /* Assign string offsets in .dynstr, update all structures referencing
3168 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3170 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3171 struct elf_link_local_dynamic_entry *entry;
3172 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3173 bfd *dynobj = hash_table->dynobj;
3176 const struct elf_backend_data *bed;
3179 _bfd_elf_strtab_finalize (dynstr);
3180 size = _bfd_elf_strtab_size (dynstr);
3182 bed = get_elf_backend_data (dynobj);
3183 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3184 BFD_ASSERT (sdyn != NULL);
3186 /* Update all .dynamic entries referencing .dynstr strings. */
3187 for (extdyn = sdyn->contents;
3188 extdyn < sdyn->contents + sdyn->size;
3189 extdyn += bed->s->sizeof_dyn)
3191 Elf_Internal_Dyn dyn;
3193 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3197 dyn.d_un.d_val = size;
3207 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3212 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3215 /* Now update local dynamic symbols. */
3216 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3217 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3218 entry->isym.st_name);
3220 /* And the rest of dynamic symbols. */
3221 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3223 /* Adjust version definitions. */
3224 if (elf_tdata (output_bfd)->cverdefs)
3229 Elf_Internal_Verdef def;
3230 Elf_Internal_Verdaux defaux;
3232 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3236 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3238 p += sizeof (Elf_External_Verdef);
3239 if (def.vd_aux != sizeof (Elf_External_Verdef))
3241 for (i = 0; i < def.vd_cnt; ++i)
3243 _bfd_elf_swap_verdaux_in (output_bfd,
3244 (Elf_External_Verdaux *) p, &defaux);
3245 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3247 _bfd_elf_swap_verdaux_out (output_bfd,
3248 &defaux, (Elf_External_Verdaux *) p);
3249 p += sizeof (Elf_External_Verdaux);
3252 while (def.vd_next);
3255 /* Adjust version references. */
3256 if (elf_tdata (output_bfd)->verref)
3261 Elf_Internal_Verneed need;
3262 Elf_Internal_Vernaux needaux;
3264 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3268 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3270 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3271 _bfd_elf_swap_verneed_out (output_bfd, &need,
3272 (Elf_External_Verneed *) p);
3273 p += sizeof (Elf_External_Verneed);
3274 for (i = 0; i < need.vn_cnt; ++i)
3276 _bfd_elf_swap_vernaux_in (output_bfd,
3277 (Elf_External_Vernaux *) p, &needaux);
3278 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3280 _bfd_elf_swap_vernaux_out (output_bfd,
3282 (Elf_External_Vernaux *) p);
3283 p += sizeof (Elf_External_Vernaux);
3286 while (need.vn_next);
3292 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3293 The default is to only match when the INPUT and OUTPUT are exactly
3297 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3298 const bfd_target *output)
3300 return input == output;
3303 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3304 This version is used when different targets for the same architecture
3305 are virtually identical. */
3308 _bfd_elf_relocs_compatible (const bfd_target *input,
3309 const bfd_target *output)
3311 const struct elf_backend_data *obed, *ibed;
3313 if (input == output)
3316 ibed = xvec_get_elf_backend_data (input);
3317 obed = xvec_get_elf_backend_data (output);
3319 if (ibed->arch != obed->arch)
3322 /* If both backends are using this function, deem them compatible. */
3323 return ibed->relocs_compatible == obed->relocs_compatible;
3326 /* Add symbols from an ELF object file to the linker hash table. */
3329 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3331 Elf_Internal_Ehdr *ehdr;
3332 Elf_Internal_Shdr *hdr;
3333 bfd_size_type symcount;
3334 bfd_size_type extsymcount;
3335 bfd_size_type extsymoff;
3336 struct elf_link_hash_entry **sym_hash;
3337 bfd_boolean dynamic;
3338 Elf_External_Versym *extversym = NULL;
3339 Elf_External_Versym *ever;
3340 struct elf_link_hash_entry *weaks;
3341 struct elf_link_hash_entry **nondeflt_vers = NULL;
3342 bfd_size_type nondeflt_vers_cnt = 0;
3343 Elf_Internal_Sym *isymbuf = NULL;
3344 Elf_Internal_Sym *isym;
3345 Elf_Internal_Sym *isymend;
3346 const struct elf_backend_data *bed;
3347 bfd_boolean add_needed;
3348 struct elf_link_hash_table *htab;
3350 void *alloc_mark = NULL;
3351 struct bfd_hash_entry **old_table = NULL;
3352 unsigned int old_size = 0;
3353 unsigned int old_count = 0;
3354 void *old_tab = NULL;
3357 struct bfd_link_hash_entry *old_undefs = NULL;
3358 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3359 long old_dynsymcount = 0;
3361 size_t hashsize = 0;
3363 htab = elf_hash_table (info);
3364 bed = get_elf_backend_data (abfd);
3366 if ((abfd->flags & DYNAMIC) == 0)
3372 /* You can't use -r against a dynamic object. Also, there's no
3373 hope of using a dynamic object which does not exactly match
3374 the format of the output file. */
3375 if (info->relocatable
3376 || !is_elf_hash_table (htab)
3377 || info->output_bfd->xvec != abfd->xvec)
3379 if (info->relocatable)
3380 bfd_set_error (bfd_error_invalid_operation);
3382 bfd_set_error (bfd_error_wrong_format);
3387 ehdr = elf_elfheader (abfd);
3388 if (info->warn_alternate_em
3389 && bed->elf_machine_code != ehdr->e_machine
3390 && ((bed->elf_machine_alt1 != 0
3391 && ehdr->e_machine == bed->elf_machine_alt1)
3392 || (bed->elf_machine_alt2 != 0
3393 && ehdr->e_machine == bed->elf_machine_alt2)))
3394 info->callbacks->einfo
3395 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3396 ehdr->e_machine, abfd, bed->elf_machine_code);
3398 /* As a GNU extension, any input sections which are named
3399 .gnu.warning.SYMBOL are treated as warning symbols for the given
3400 symbol. This differs from .gnu.warning sections, which generate
3401 warnings when they are included in an output file. */
3402 /* PR 12761: Also generate this warning when building shared libraries. */
3403 if (info->executable || info->shared)
3407 for (s = abfd->sections; s != NULL; s = s->next)
3411 name = bfd_get_section_name (abfd, s);
3412 if (CONST_STRNEQ (name, ".gnu.warning."))
3417 name += sizeof ".gnu.warning." - 1;
3419 /* If this is a shared object, then look up the symbol
3420 in the hash table. If it is there, and it is already
3421 been defined, then we will not be using the entry
3422 from this shared object, so we don't need to warn.
3423 FIXME: If we see the definition in a regular object
3424 later on, we will warn, but we shouldn't. The only
3425 fix is to keep track of what warnings we are supposed
3426 to emit, and then handle them all at the end of the
3430 struct elf_link_hash_entry *h;
3432 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3434 /* FIXME: What about bfd_link_hash_common? */
3436 && (h->root.type == bfd_link_hash_defined
3437 || h->root.type == bfd_link_hash_defweak))
3439 /* We don't want to issue this warning. Clobber
3440 the section size so that the warning does not
3441 get copied into the output file. */
3448 msg = (char *) bfd_alloc (abfd, sz + 1);
3452 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3457 if (! (_bfd_generic_link_add_one_symbol
3458 (info, abfd, name, BSF_WARNING, s, 0, msg,
3459 FALSE, bed->collect, NULL)))
3462 if (! info->relocatable)
3464 /* Clobber the section size so that the warning does
3465 not get copied into the output file. */
3468 /* Also set SEC_EXCLUDE, so that symbols defined in
3469 the warning section don't get copied to the output. */
3470 s->flags |= SEC_EXCLUDE;
3479 /* If we are creating a shared library, create all the dynamic
3480 sections immediately. We need to attach them to something,
3481 so we attach them to this BFD, provided it is the right
3482 format. FIXME: If there are no input BFD's of the same
3483 format as the output, we can't make a shared library. */
3485 && is_elf_hash_table (htab)
3486 && info->output_bfd->xvec == abfd->xvec
3487 && !htab->dynamic_sections_created)
3489 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3493 else if (!is_elf_hash_table (htab))
3498 const char *soname = NULL;
3500 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3503 /* ld --just-symbols and dynamic objects don't mix very well.
3504 ld shouldn't allow it. */
3505 if ((s = abfd->sections) != NULL
3506 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3509 /* If this dynamic lib was specified on the command line with
3510 --as-needed in effect, then we don't want to add a DT_NEEDED
3511 tag unless the lib is actually used. Similary for libs brought
3512 in by another lib's DT_NEEDED. When --no-add-needed is used
3513 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3514 any dynamic library in DT_NEEDED tags in the dynamic lib at
3516 add_needed = (elf_dyn_lib_class (abfd)
3517 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3518 | DYN_NO_NEEDED)) == 0;
3520 s = bfd_get_section_by_name (abfd, ".dynamic");
3525 unsigned int elfsec;
3526 unsigned long shlink;
3528 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3535 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3536 if (elfsec == SHN_BAD)
3537 goto error_free_dyn;
3538 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3540 for (extdyn = dynbuf;
3541 extdyn < dynbuf + s->size;
3542 extdyn += bed->s->sizeof_dyn)
3544 Elf_Internal_Dyn dyn;
3546 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3547 if (dyn.d_tag == DT_SONAME)
3549 unsigned int tagv = dyn.d_un.d_val;
3550 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3552 goto error_free_dyn;
3554 if (dyn.d_tag == DT_NEEDED)
3556 struct bfd_link_needed_list *n, **pn;
3558 unsigned int tagv = dyn.d_un.d_val;
3560 amt = sizeof (struct bfd_link_needed_list);
3561 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3562 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3563 if (n == NULL || fnm == NULL)
3564 goto error_free_dyn;
3565 amt = strlen (fnm) + 1;
3566 anm = (char *) bfd_alloc (abfd, amt);
3568 goto error_free_dyn;
3569 memcpy (anm, fnm, amt);
3573 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3577 if (dyn.d_tag == DT_RUNPATH)
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);
3596 for (pn = & runpath;
3602 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3603 if (!runpath && dyn.d_tag == DT_RPATH)
3605 struct bfd_link_needed_list *n, **pn;
3607 unsigned int tagv = dyn.d_un.d_val;
3609 amt = sizeof (struct bfd_link_needed_list);
3610 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3611 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3612 if (n == NULL || fnm == NULL)
3613 goto error_free_dyn;
3614 amt = strlen (fnm) + 1;
3615 anm = (char *) bfd_alloc (abfd, amt);
3617 goto error_free_dyn;
3618 memcpy (anm, fnm, amt);
3628 if (dyn.d_tag == DT_AUDIT)
3630 unsigned int tagv = dyn.d_un.d_val;
3631 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3638 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3639 frees all more recently bfd_alloc'd blocks as well. */
3645 struct bfd_link_needed_list **pn;
3646 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3651 /* We do not want to include any of the sections in a dynamic
3652 object in the output file. We hack by simply clobbering the
3653 list of sections in the BFD. This could be handled more
3654 cleanly by, say, a new section flag; the existing
3655 SEC_NEVER_LOAD flag is not the one we want, because that one
3656 still implies that the section takes up space in the output
3658 bfd_section_list_clear (abfd);
3660 /* Find the name to use in a DT_NEEDED entry that refers to this
3661 object. If the object has a DT_SONAME entry, we use it.
3662 Otherwise, if the generic linker stuck something in
3663 elf_dt_name, we use that. Otherwise, we just use the file
3665 if (soname == NULL || *soname == '\0')
3667 soname = elf_dt_name (abfd);
3668 if (soname == NULL || *soname == '\0')
3669 soname = bfd_get_filename (abfd);
3672 /* Save the SONAME because sometimes the linker emulation code
3673 will need to know it. */
3674 elf_dt_name (abfd) = soname;
3676 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3680 /* If we have already included this dynamic object in the
3681 link, just ignore it. There is no reason to include a
3682 particular dynamic object more than once. */
3686 /* Save the DT_AUDIT entry for the linker emulation code. */
3687 elf_dt_audit (abfd) = audit;
3690 /* If this is a dynamic object, we always link against the .dynsym
3691 symbol table, not the .symtab symbol table. The dynamic linker
3692 will only see the .dynsym symbol table, so there is no reason to
3693 look at .symtab for a dynamic object. */
3695 if (! dynamic || elf_dynsymtab (abfd) == 0)
3696 hdr = &elf_tdata (abfd)->symtab_hdr;
3698 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3700 symcount = hdr->sh_size / bed->s->sizeof_sym;
3702 /* The sh_info field of the symtab header tells us where the
3703 external symbols start. We don't care about the local symbols at
3705 if (elf_bad_symtab (abfd))
3707 extsymcount = symcount;
3712 extsymcount = symcount - hdr->sh_info;
3713 extsymoff = hdr->sh_info;
3717 if (extsymcount != 0)
3719 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3721 if (isymbuf == NULL)
3724 /* We store a pointer to the hash table entry for each external
3726 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3727 sym_hash = (struct elf_link_hash_entry **) bfd_alloc (abfd, amt);
3728 if (sym_hash == NULL)
3729 goto error_free_sym;
3730 elf_sym_hashes (abfd) = sym_hash;
3735 /* Read in any version definitions. */
3736 if (!_bfd_elf_slurp_version_tables (abfd,
3737 info->default_imported_symver))
3738 goto error_free_sym;
3740 /* Read in the symbol versions, but don't bother to convert them
3741 to internal format. */
3742 if (elf_dynversym (abfd) != 0)
3744 Elf_Internal_Shdr *versymhdr;
3746 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3747 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3748 if (extversym == NULL)
3749 goto error_free_sym;
3750 amt = versymhdr->sh_size;
3751 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3752 || bfd_bread (extversym, amt, abfd) != amt)
3753 goto error_free_vers;
3757 /* If we are loading an as-needed shared lib, save the symbol table
3758 state before we start adding symbols. If the lib turns out
3759 to be unneeded, restore the state. */
3760 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3765 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3767 struct bfd_hash_entry *p;
3768 struct elf_link_hash_entry *h;
3770 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3772 h = (struct elf_link_hash_entry *) p;
3773 entsize += htab->root.table.entsize;
3774 if (h->root.type == bfd_link_hash_warning)
3775 entsize += htab->root.table.entsize;
3779 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3780 hashsize = extsymcount * sizeof (struct elf_link_hash_entry *);
3781 old_tab = bfd_malloc (tabsize + entsize + hashsize);
3782 if (old_tab == NULL)
3783 goto error_free_vers;
3785 /* Remember the current objalloc pointer, so that all mem for
3786 symbols added can later be reclaimed. */
3787 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3788 if (alloc_mark == NULL)
3789 goto error_free_vers;
3791 /* Make a special call to the linker "notice" function to
3792 tell it that we are about to handle an as-needed lib. */
3793 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
3794 notice_as_needed, 0, NULL))
3795 goto error_free_vers;
3797 /* Clone the symbol table and sym hashes. Remember some
3798 pointers into the symbol table, and dynamic symbol count. */
3799 old_hash = (char *) old_tab + tabsize;
3800 old_ent = (char *) old_hash + hashsize;
3801 memcpy (old_tab, htab->root.table.table, tabsize);
3802 memcpy (old_hash, sym_hash, hashsize);
3803 old_undefs = htab->root.undefs;
3804 old_undefs_tail = htab->root.undefs_tail;
3805 old_table = htab->root.table.table;
3806 old_size = htab->root.table.size;
3807 old_count = htab->root.table.count;
3808 old_dynsymcount = htab->dynsymcount;
3810 for (i = 0; i < htab->root.table.size; i++)
3812 struct bfd_hash_entry *p;
3813 struct elf_link_hash_entry *h;
3815 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3817 memcpy (old_ent, p, htab->root.table.entsize);
3818 old_ent = (char *) old_ent + htab->root.table.entsize;
3819 h = (struct elf_link_hash_entry *) p;
3820 if (h->root.type == bfd_link_hash_warning)
3822 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3823 old_ent = (char *) old_ent + htab->root.table.entsize;
3830 ever = extversym != NULL ? extversym + extsymoff : NULL;
3831 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3833 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3837 asection *sec, *new_sec;
3840 struct elf_link_hash_entry *h;
3841 bfd_boolean definition;
3842 bfd_boolean size_change_ok;
3843 bfd_boolean type_change_ok;
3844 bfd_boolean new_weakdef;
3845 bfd_boolean override;
3847 unsigned int old_alignment;
3849 bfd * undef_bfd = NULL;
3853 flags = BSF_NO_FLAGS;
3855 value = isym->st_value;
3857 common = bed->common_definition (isym);
3859 bind = ELF_ST_BIND (isym->st_info);
3863 /* This should be impossible, since ELF requires that all
3864 global symbols follow all local symbols, and that sh_info
3865 point to the first global symbol. Unfortunately, Irix 5
3870 if (isym->st_shndx != SHN_UNDEF && !common)
3878 case STB_GNU_UNIQUE:
3879 flags = BSF_GNU_UNIQUE;
3883 /* Leave it up to the processor backend. */
3887 if (isym->st_shndx == SHN_UNDEF)
3888 sec = bfd_und_section_ptr;
3889 else if (isym->st_shndx == SHN_ABS)
3890 sec = bfd_abs_section_ptr;
3891 else if (isym->st_shndx == SHN_COMMON)
3893 sec = bfd_com_section_ptr;
3894 /* What ELF calls the size we call the value. What ELF
3895 calls the value we call the alignment. */
3896 value = isym->st_size;
3900 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3902 sec = bfd_abs_section_ptr;
3903 else if (discarded_section (sec))
3905 /* Symbols from discarded section are undefined. We keep
3907 sec = bfd_und_section_ptr;
3908 isym->st_shndx = SHN_UNDEF;
3910 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3914 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3917 goto error_free_vers;
3919 if (isym->st_shndx == SHN_COMMON
3920 && (abfd->flags & BFD_PLUGIN) != 0)
3922 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
3926 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
3928 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
3930 goto error_free_vers;
3934 else if (isym->st_shndx == SHN_COMMON
3935 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3936 && !info->relocatable)
3938 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3942 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
3943 | SEC_LINKER_CREATED);
3944 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
3946 goto error_free_vers;
3950 else if (bed->elf_add_symbol_hook)
3952 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3954 goto error_free_vers;
3956 /* The hook function sets the name to NULL if this symbol
3957 should be skipped for some reason. */
3962 /* Sanity check that all possibilities were handled. */
3965 bfd_set_error (bfd_error_bad_value);
3966 goto error_free_vers;
3969 if (bfd_is_und_section (sec)
3970 || bfd_is_com_section (sec))
3975 size_change_ok = FALSE;
3976 type_change_ok = bed->type_change_ok;
3981 if (is_elf_hash_table (htab))
3983 Elf_Internal_Versym iver;
3984 unsigned int vernum = 0;
3987 /* If this is a definition of a symbol which was previously
3988 referenced in a non-weak manner then make a note of the bfd
3989 that contained the reference. This is used if we need to
3990 refer to the source of the reference later on. */
3991 if (! bfd_is_und_section (sec))
3993 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
3996 && h->root.type == bfd_link_hash_undefined
3997 && h->root.u.undef.abfd)
3998 undef_bfd = h->root.u.undef.abfd;
4003 if (info->default_imported_symver)
4004 /* Use the default symbol version created earlier. */
4005 iver.vs_vers = elf_tdata (abfd)->cverdefs;
4010 _bfd_elf_swap_versym_in (abfd, ever, &iver);
4012 vernum = iver.vs_vers & VERSYM_VERSION;
4014 /* If this is a hidden symbol, or if it is not version
4015 1, we append the version name to the symbol name.
4016 However, we do not modify a non-hidden absolute symbol
4017 if it is not a function, because it might be the version
4018 symbol itself. FIXME: What if it isn't? */
4019 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4021 && (!bfd_is_abs_section (sec)
4022 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4025 size_t namelen, verlen, newlen;
4028 if (isym->st_shndx != SHN_UNDEF)
4030 if (vernum > elf_tdata (abfd)->cverdefs)
4032 else if (vernum > 1)
4034 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4040 (*_bfd_error_handler)
4041 (_("%B: %s: invalid version %u (max %d)"),
4043 elf_tdata (abfd)->cverdefs);
4044 bfd_set_error (bfd_error_bad_value);
4045 goto error_free_vers;
4050 /* We cannot simply test for the number of
4051 entries in the VERNEED section since the
4052 numbers for the needed versions do not start
4054 Elf_Internal_Verneed *t;
4057 for (t = elf_tdata (abfd)->verref;
4061 Elf_Internal_Vernaux *a;
4063 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4065 if (a->vna_other == vernum)
4067 verstr = a->vna_nodename;
4076 (*_bfd_error_handler)
4077 (_("%B: %s: invalid needed version %d"),
4078 abfd, name, vernum);
4079 bfd_set_error (bfd_error_bad_value);
4080 goto error_free_vers;
4084 namelen = strlen (name);
4085 verlen = strlen (verstr);
4086 newlen = namelen + verlen + 2;
4087 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4088 && isym->st_shndx != SHN_UNDEF)
4091 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4092 if (newname == NULL)
4093 goto error_free_vers;
4094 memcpy (newname, name, namelen);
4095 p = newname + namelen;
4097 /* If this is a defined non-hidden version symbol,
4098 we add another @ to the name. This indicates the
4099 default version of the symbol. */
4100 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4101 && isym->st_shndx != SHN_UNDEF)
4103 memcpy (p, verstr, verlen + 1);
4108 /* If necessary, make a second attempt to locate the bfd
4109 containing an unresolved, non-weak reference to the
4111 if (! bfd_is_und_section (sec) && undef_bfd == NULL)
4113 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
4116 && h->root.type == bfd_link_hash_undefined
4117 && h->root.u.undef.abfd)
4118 undef_bfd = h->root.u.undef.abfd;
4121 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec,
4122 &value, &old_alignment,
4123 sym_hash, &skip, &override,
4124 &type_change_ok, &size_change_ok))
4125 goto error_free_vers;
4134 while (h->root.type == bfd_link_hash_indirect
4135 || h->root.type == bfd_link_hash_warning)
4136 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4138 /* Remember the old alignment if this is a common symbol, so
4139 that we don't reduce the alignment later on. We can't
4140 check later, because _bfd_generic_link_add_one_symbol
4141 will set a default for the alignment which we want to
4142 override. We also remember the old bfd where the existing
4143 definition comes from. */
4144 switch (h->root.type)
4149 case bfd_link_hash_defined:
4150 case bfd_link_hash_defweak:
4151 old_bfd = h->root.u.def.section->owner;
4154 case bfd_link_hash_common:
4155 old_bfd = h->root.u.c.p->section->owner;
4156 old_alignment = h->root.u.c.p->alignment_power;
4160 if (elf_tdata (abfd)->verdef != NULL
4164 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4167 if (! (_bfd_generic_link_add_one_symbol
4168 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4169 (struct bfd_link_hash_entry **) sym_hash)))
4170 goto error_free_vers;
4173 while (h->root.type == bfd_link_hash_indirect
4174 || h->root.type == bfd_link_hash_warning)
4175 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4178 if (is_elf_hash_table (htab))
4179 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4181 new_weakdef = FALSE;
4184 && (flags & BSF_WEAK) != 0
4185 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4186 && is_elf_hash_table (htab)
4187 && h->u.weakdef == NULL)
4189 /* Keep a list of all weak defined non function symbols from
4190 a dynamic object, using the weakdef field. Later in this
4191 function we will set the weakdef field to the correct
4192 value. We only put non-function symbols from dynamic
4193 objects on this list, because that happens to be the only
4194 time we need to know the normal symbol corresponding to a
4195 weak symbol, and the information is time consuming to
4196 figure out. If the weakdef field is not already NULL,
4197 then this symbol was already defined by some previous
4198 dynamic object, and we will be using that previous
4199 definition anyhow. */
4201 h->u.weakdef = weaks;
4206 /* Set the alignment of a common symbol. */
4207 if ((common || bfd_is_com_section (sec))
4208 && h->root.type == bfd_link_hash_common)
4213 align = bfd_log2 (isym->st_value);
4216 /* The new symbol is a common symbol in a shared object.
4217 We need to get the alignment from the section. */
4218 align = new_sec->alignment_power;
4220 if (align > old_alignment)
4221 h->root.u.c.p->alignment_power = align;
4223 h->root.u.c.p->alignment_power = old_alignment;
4226 if (is_elf_hash_table (htab))
4230 /* Check the alignment when a common symbol is involved. This
4231 can change when a common symbol is overridden by a normal
4232 definition or a common symbol is ignored due to the old
4233 normal definition. We need to make sure the maximum
4234 alignment is maintained. */
4235 if ((old_alignment || common)
4236 && h->root.type != bfd_link_hash_common)
4238 unsigned int common_align;
4239 unsigned int normal_align;
4240 unsigned int symbol_align;
4244 symbol_align = ffs (h->root.u.def.value) - 1;
4245 if (h->root.u.def.section->owner != NULL
4246 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4248 normal_align = h->root.u.def.section->alignment_power;
4249 if (normal_align > symbol_align)
4250 normal_align = symbol_align;
4253 normal_align = symbol_align;
4257 common_align = old_alignment;
4258 common_bfd = old_bfd;
4263 common_align = bfd_log2 (isym->st_value);
4265 normal_bfd = old_bfd;
4268 if (normal_align < common_align)
4270 /* PR binutils/2735 */
4271 if (normal_bfd == NULL)
4272 (*_bfd_error_handler)
4273 (_("Warning: alignment %u of common symbol `%s' in %B"
4274 " is greater than the alignment (%u) of its section %A"),
4275 common_bfd, h->root.u.def.section,
4276 1 << common_align, name, 1 << normal_align);
4278 (*_bfd_error_handler)
4279 (_("Warning: alignment %u of symbol `%s' in %B"
4280 " is smaller than %u in %B"),
4281 normal_bfd, common_bfd,
4282 1 << normal_align, name, 1 << common_align);
4286 /* Remember the symbol size if it isn't undefined. */
4287 if ((isym->st_size != 0 && isym->st_shndx != SHN_UNDEF)
4288 && (definition || h->size == 0))
4291 && h->size != isym->st_size
4292 && ! size_change_ok)
4293 (*_bfd_error_handler)
4294 (_("Warning: size of symbol `%s' changed"
4295 " from %lu in %B to %lu in %B"),
4297 name, (unsigned long) h->size,
4298 (unsigned long) isym->st_size);
4300 h->size = isym->st_size;
4303 /* If this is a common symbol, then we always want H->SIZE
4304 to be the size of the common symbol. The code just above
4305 won't fix the size if a common symbol becomes larger. We
4306 don't warn about a size change here, because that is
4307 covered by --warn-common. Allow changed between different
4309 if (h->root.type == bfd_link_hash_common)
4310 h->size = h->root.u.c.size;
4312 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4313 && (definition || h->type == STT_NOTYPE))
4315 unsigned int type = ELF_ST_TYPE (isym->st_info);
4317 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4319 if (type == STT_GNU_IFUNC
4320 && (abfd->flags & DYNAMIC) != 0)
4323 if (h->type != type)
4325 if (h->type != STT_NOTYPE && ! type_change_ok)
4326 (*_bfd_error_handler)
4327 (_("Warning: type of symbol `%s' changed"
4328 " from %d to %d in %B"),
4329 abfd, name, h->type, type);
4335 /* Merge st_other field. */
4336 elf_merge_st_other (abfd, h, isym, definition, dynamic);
4338 /* Set a flag in the hash table entry indicating the type of
4339 reference or definition we just found. Keep a count of
4340 the number of dynamic symbols we find. A dynamic symbol
4341 is one which is referenced or defined by both a regular
4342 object and a shared object. */
4349 if (bind != STB_WEAK)
4350 h->ref_regular_nonweak = 1;
4361 if (! info->executable
4377 || (h->u.weakdef != NULL
4379 && h->u.weakdef->dynindx != -1))
4383 /* We don't want to make debug symbol dynamic. */
4384 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4387 /* Nor should we make plugin symbols dynamic. */
4388 if ((abfd->flags & BFD_PLUGIN) != 0)
4392 h->target_internal = isym->st_target_internal;
4394 /* Check to see if we need to add an indirect symbol for
4395 the default name. */
4396 if (definition || h->root.type == bfd_link_hash_common)
4397 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4398 &sec, &value, &dynsym,
4400 goto error_free_vers;
4402 if (definition && !dynamic)
4404 char *p = strchr (name, ELF_VER_CHR);
4405 if (p != NULL && p[1] != ELF_VER_CHR)
4407 /* Queue non-default versions so that .symver x, x@FOO
4408 aliases can be checked. */
4411 amt = ((isymend - isym + 1)
4412 * sizeof (struct elf_link_hash_entry *));
4414 (struct elf_link_hash_entry **) bfd_malloc (amt);
4416 goto error_free_vers;
4418 nondeflt_vers[nondeflt_vers_cnt++] = h;
4422 if (dynsym && h->dynindx == -1)
4424 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4425 goto error_free_vers;
4426 if (h->u.weakdef != NULL
4428 && h->u.weakdef->dynindx == -1)
4430 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4431 goto error_free_vers;
4434 else if (dynsym && h->dynindx != -1)
4435 /* If the symbol already has a dynamic index, but
4436 visibility says it should not be visible, turn it into
4438 switch (ELF_ST_VISIBILITY (h->other))
4442 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4452 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4453 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4456 const char *soname = elf_dt_name (abfd);
4458 /* A symbol from a library loaded via DT_NEEDED of some
4459 other library is referenced by a regular object.
4460 Add a DT_NEEDED entry for it. Issue an error if
4461 --no-add-needed is used and the reference was not
4463 if (undef_bfd != NULL
4464 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4466 (*_bfd_error_handler)
4467 (_("%B: undefined reference to symbol '%s'"),
4469 (*_bfd_error_handler)
4470 (_("note: '%s' is defined in DSO %B so try adding it to the linker command line"),
4472 bfd_set_error (bfd_error_invalid_operation);
4473 goto error_free_vers;
4476 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4477 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4480 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4482 goto error_free_vers;
4484 BFD_ASSERT (ret == 0);
4489 if (extversym != NULL)
4495 if (isymbuf != NULL)
4501 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4505 /* Restore the symbol table. */
4506 if (bed->as_needed_cleanup)
4507 (*bed->as_needed_cleanup) (abfd, info);
4508 old_hash = (char *) old_tab + tabsize;
4509 old_ent = (char *) old_hash + hashsize;
4510 sym_hash = elf_sym_hashes (abfd);
4511 htab->root.table.table = old_table;
4512 htab->root.table.size = old_size;
4513 htab->root.table.count = old_count;
4514 memcpy (htab->root.table.table, old_tab, tabsize);
4515 memcpy (sym_hash, old_hash, hashsize);
4516 htab->root.undefs = old_undefs;
4517 htab->root.undefs_tail = old_undefs_tail;
4518 for (i = 0; i < htab->root.table.size; i++)
4520 struct bfd_hash_entry *p;
4521 struct elf_link_hash_entry *h;
4523 unsigned int alignment_power;
4525 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4527 h = (struct elf_link_hash_entry *) p;
4528 if (h->root.type == bfd_link_hash_warning)
4529 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4530 if (h->dynindx >= old_dynsymcount)
4531 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4533 /* Preserve the maximum alignment and size for common
4534 symbols even if this dynamic lib isn't on DT_NEEDED
4535 since it can still be loaded at the run-time by another
4537 if (h->root.type == bfd_link_hash_common)
4539 size = h->root.u.c.size;
4540 alignment_power = h->root.u.c.p->alignment_power;
4545 alignment_power = 0;
4547 memcpy (p, old_ent, htab->root.table.entsize);
4548 old_ent = (char *) old_ent + htab->root.table.entsize;
4549 h = (struct elf_link_hash_entry *) p;
4550 if (h->root.type == bfd_link_hash_warning)
4552 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4553 old_ent = (char *) old_ent + htab->root.table.entsize;
4555 else if (h->root.type == bfd_link_hash_common)
4557 if (size > h->root.u.c.size)
4558 h->root.u.c.size = size;
4559 if (alignment_power > h->root.u.c.p->alignment_power)
4560 h->root.u.c.p->alignment_power = alignment_power;
4565 /* Make a special call to the linker "notice" function to
4566 tell it that symbols added for crefs may need to be removed. */
4567 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4568 notice_not_needed, 0, NULL))
4569 goto error_free_vers;
4572 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4574 if (nondeflt_vers != NULL)
4575 free (nondeflt_vers);
4579 if (old_tab != NULL)
4581 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4582 notice_needed, 0, NULL))
4583 goto error_free_vers;
4588 /* Now that all the symbols from this input file are created, handle
4589 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4590 if (nondeflt_vers != NULL)
4592 bfd_size_type cnt, symidx;
4594 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4596 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4597 char *shortname, *p;
4599 p = strchr (h->root.root.string, ELF_VER_CHR);
4601 || (h->root.type != bfd_link_hash_defined
4602 && h->root.type != bfd_link_hash_defweak))
4605 amt = p - h->root.root.string;
4606 shortname = (char *) bfd_malloc (amt + 1);
4608 goto error_free_vers;
4609 memcpy (shortname, h->root.root.string, amt);
4610 shortname[amt] = '\0';
4612 hi = (struct elf_link_hash_entry *)
4613 bfd_link_hash_lookup (&htab->root, shortname,
4614 FALSE, FALSE, FALSE);
4616 && hi->root.type == h->root.type
4617 && hi->root.u.def.value == h->root.u.def.value
4618 && hi->root.u.def.section == h->root.u.def.section)
4620 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4621 hi->root.type = bfd_link_hash_indirect;
4622 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4623 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4624 sym_hash = elf_sym_hashes (abfd);
4626 for (symidx = 0; symidx < extsymcount; ++symidx)
4627 if (sym_hash[symidx] == hi)
4629 sym_hash[symidx] = h;
4635 free (nondeflt_vers);
4636 nondeflt_vers = NULL;
4639 /* Now set the weakdefs field correctly for all the weak defined
4640 symbols we found. The only way to do this is to search all the
4641 symbols. Since we only need the information for non functions in
4642 dynamic objects, that's the only time we actually put anything on
4643 the list WEAKS. We need this information so that if a regular
4644 object refers to a symbol defined weakly in a dynamic object, the
4645 real symbol in the dynamic object is also put in the dynamic
4646 symbols; we also must arrange for both symbols to point to the
4647 same memory location. We could handle the general case of symbol
4648 aliasing, but a general symbol alias can only be generated in
4649 assembler code, handling it correctly would be very time
4650 consuming, and other ELF linkers don't handle general aliasing
4654 struct elf_link_hash_entry **hpp;
4655 struct elf_link_hash_entry **hppend;
4656 struct elf_link_hash_entry **sorted_sym_hash;
4657 struct elf_link_hash_entry *h;
4660 /* Since we have to search the whole symbol list for each weak
4661 defined symbol, search time for N weak defined symbols will be
4662 O(N^2). Binary search will cut it down to O(NlogN). */
4663 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4664 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4665 if (sorted_sym_hash == NULL)
4667 sym_hash = sorted_sym_hash;
4668 hpp = elf_sym_hashes (abfd);
4669 hppend = hpp + extsymcount;
4671 for (; hpp < hppend; hpp++)
4675 && h->root.type == bfd_link_hash_defined
4676 && !bed->is_function_type (h->type))
4684 qsort (sorted_sym_hash, sym_count,
4685 sizeof (struct elf_link_hash_entry *),
4688 while (weaks != NULL)
4690 struct elf_link_hash_entry *hlook;
4697 weaks = hlook->u.weakdef;
4698 hlook->u.weakdef = NULL;
4700 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4701 || hlook->root.type == bfd_link_hash_defweak
4702 || hlook->root.type == bfd_link_hash_common
4703 || hlook->root.type == bfd_link_hash_indirect);
4704 slook = hlook->root.u.def.section;
4705 vlook = hlook->root.u.def.value;
4712 bfd_signed_vma vdiff;
4714 h = sorted_sym_hash [idx];
4715 vdiff = vlook - h->root.u.def.value;
4722 long sdiff = slook->id - h->root.u.def.section->id;
4735 /* We didn't find a value/section match. */
4739 for (i = ilook; i < sym_count; i++)
4741 h = sorted_sym_hash [i];
4743 /* Stop if value or section doesn't match. */
4744 if (h->root.u.def.value != vlook
4745 || h->root.u.def.section != slook)
4747 else if (h != hlook)
4749 hlook->u.weakdef = h;
4751 /* If the weak definition is in the list of dynamic
4752 symbols, make sure the real definition is put
4754 if (hlook->dynindx != -1 && h->dynindx == -1)
4756 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4759 free (sorted_sym_hash);
4764 /* If the real definition is in the list of dynamic
4765 symbols, make sure the weak definition is put
4766 there as well. If we don't do this, then the
4767 dynamic loader might not merge the entries for the
4768 real definition and the weak definition. */
4769 if (h->dynindx != -1 && hlook->dynindx == -1)
4771 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4772 goto err_free_sym_hash;
4779 free (sorted_sym_hash);
4782 if (bed->check_directives
4783 && !(*bed->check_directives) (abfd, info))
4786 /* If this object is the same format as the output object, and it is
4787 not a shared library, then let the backend look through the
4790 This is required to build global offset table entries and to
4791 arrange for dynamic relocs. It is not required for the
4792 particular common case of linking non PIC code, even when linking
4793 against shared libraries, but unfortunately there is no way of
4794 knowing whether an object file has been compiled PIC or not.
4795 Looking through the relocs is not particularly time consuming.
4796 The problem is that we must either (1) keep the relocs in memory,
4797 which causes the linker to require additional runtime memory or
4798 (2) read the relocs twice from the input file, which wastes time.
4799 This would be a good case for using mmap.
4801 I have no idea how to handle linking PIC code into a file of a
4802 different format. It probably can't be done. */
4804 && is_elf_hash_table (htab)
4805 && bed->check_relocs != NULL
4806 && elf_object_id (abfd) == elf_hash_table_id (htab)
4807 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4811 for (o = abfd->sections; o != NULL; o = o->next)
4813 Elf_Internal_Rela *internal_relocs;
4816 if ((o->flags & SEC_RELOC) == 0
4817 || o->reloc_count == 0
4818 || ((info->strip == strip_all || info->strip == strip_debugger)
4819 && (o->flags & SEC_DEBUGGING) != 0)
4820 || bfd_is_abs_section (o->output_section))
4823 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4825 if (internal_relocs == NULL)
4828 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4830 if (elf_section_data (o)->relocs != internal_relocs)
4831 free (internal_relocs);
4838 /* If this is a non-traditional link, try to optimize the handling
4839 of the .stab/.stabstr sections. */
4841 && ! info->traditional_format
4842 && is_elf_hash_table (htab)
4843 && (info->strip != strip_all && info->strip != strip_debugger))
4847 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4848 if (stabstr != NULL)
4850 bfd_size_type string_offset = 0;
4853 for (stab = abfd->sections; stab; stab = stab->next)
4854 if (CONST_STRNEQ (stab->name, ".stab")
4855 && (!stab->name[5] ||
4856 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4857 && (stab->flags & SEC_MERGE) == 0
4858 && !bfd_is_abs_section (stab->output_section))
4860 struct bfd_elf_section_data *secdata;
4862 secdata = elf_section_data (stab);
4863 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4864 stabstr, &secdata->sec_info,
4867 if (secdata->sec_info)
4868 stab->sec_info_type = SEC_INFO_TYPE_STABS;
4873 if (is_elf_hash_table (htab) && add_needed)
4875 /* Add this bfd to the loaded list. */
4876 struct elf_link_loaded_list *n;
4878 n = (struct elf_link_loaded_list *)
4879 bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4883 n->next = htab->loaded;
4890 if (old_tab != NULL)
4892 if (nondeflt_vers != NULL)
4893 free (nondeflt_vers);
4894 if (extversym != NULL)
4897 if (isymbuf != NULL)
4903 /* Return the linker hash table entry of a symbol that might be
4904 satisfied by an archive symbol. Return -1 on error. */
4906 struct elf_link_hash_entry *
4907 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4908 struct bfd_link_info *info,
4911 struct elf_link_hash_entry *h;
4915 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
4919 /* If this is a default version (the name contains @@), look up the
4920 symbol again with only one `@' as well as without the version.
4921 The effect is that references to the symbol with and without the
4922 version will be matched by the default symbol in the archive. */
4924 p = strchr (name, ELF_VER_CHR);
4925 if (p == NULL || p[1] != ELF_VER_CHR)
4928 /* First check with only one `@'. */
4929 len = strlen (name);
4930 copy = (char *) bfd_alloc (abfd, len);
4932 return (struct elf_link_hash_entry *) 0 - 1;
4934 first = p - name + 1;
4935 memcpy (copy, name, first);
4936 memcpy (copy + first, name + first + 1, len - first);
4938 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
4941 /* We also need to check references to the symbol without the
4943 copy[first - 1] = '\0';
4944 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4945 FALSE, FALSE, TRUE);
4948 bfd_release (abfd, copy);
4952 /* Add symbols from an ELF archive file to the linker hash table. We
4953 don't use _bfd_generic_link_add_archive_symbols because of a
4954 problem which arises on UnixWare. The UnixWare libc.so is an
4955 archive which includes an entry libc.so.1 which defines a bunch of
4956 symbols. The libc.so archive also includes a number of other
4957 object files, which also define symbols, some of which are the same
4958 as those defined in libc.so.1. Correct linking requires that we
4959 consider each object file in turn, and include it if it defines any
4960 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4961 this; it looks through the list of undefined symbols, and includes
4962 any object file which defines them. When this algorithm is used on
4963 UnixWare, it winds up pulling in libc.so.1 early and defining a
4964 bunch of symbols. This means that some of the other objects in the
4965 archive are not included in the link, which is incorrect since they
4966 precede libc.so.1 in the archive.
4968 Fortunately, ELF archive handling is simpler than that done by
4969 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4970 oddities. In ELF, if we find a symbol in the archive map, and the
4971 symbol is currently undefined, we know that we must pull in that
4974 Unfortunately, we do have to make multiple passes over the symbol
4975 table until nothing further is resolved. */
4978 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4981 bfd_boolean *defined = NULL;
4982 bfd_boolean *included = NULL;
4986 const struct elf_backend_data *bed;
4987 struct elf_link_hash_entry * (*archive_symbol_lookup)
4988 (bfd *, struct bfd_link_info *, const char *);
4990 if (! bfd_has_map (abfd))
4992 /* An empty archive is a special case. */
4993 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4995 bfd_set_error (bfd_error_no_armap);
4999 /* Keep track of all symbols we know to be already defined, and all
5000 files we know to be already included. This is to speed up the
5001 second and subsequent passes. */
5002 c = bfd_ardata (abfd)->symdef_count;
5006 amt *= sizeof (bfd_boolean);
5007 defined = (bfd_boolean *) bfd_zmalloc (amt);
5008 included = (bfd_boolean *) bfd_zmalloc (amt);
5009 if (defined == NULL || included == NULL)
5012 symdefs = bfd_ardata (abfd)->symdefs;
5013 bed = get_elf_backend_data (abfd);
5014 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5027 symdefend = symdef + c;
5028 for (i = 0; symdef < symdefend; symdef++, i++)
5030 struct elf_link_hash_entry *h;
5032 struct bfd_link_hash_entry *undefs_tail;
5035 if (defined[i] || included[i])
5037 if (symdef->file_offset == last)
5043 h = archive_symbol_lookup (abfd, info, symdef->name);
5044 if (h == (struct elf_link_hash_entry *) 0 - 1)
5050 if (h->root.type == bfd_link_hash_common)
5052 /* We currently have a common symbol. The archive map contains
5053 a reference to this symbol, so we may want to include it. We
5054 only want to include it however, if this archive element
5055 contains a definition of the symbol, not just another common
5058 Unfortunately some archivers (including GNU ar) will put
5059 declarations of common symbols into their archive maps, as
5060 well as real definitions, so we cannot just go by the archive
5061 map alone. Instead we must read in the element's symbol
5062 table and check that to see what kind of symbol definition
5064 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5067 else if (h->root.type != bfd_link_hash_undefined)
5069 if (h->root.type != bfd_link_hash_undefweak)
5074 /* We need to include this archive member. */
5075 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5076 if (element == NULL)
5079 if (! bfd_check_format (element, bfd_object))
5082 /* Doublecheck that we have not included this object
5083 already--it should be impossible, but there may be
5084 something wrong with the archive. */
5085 if (element->archive_pass != 0)
5087 bfd_set_error (bfd_error_bad_value);
5090 element->archive_pass = 1;
5092 undefs_tail = info->hash->undefs_tail;
5094 if (!(*info->callbacks
5095 ->add_archive_element) (info, element, symdef->name, &element))
5097 if (!bfd_link_add_symbols (element, info))
5100 /* If there are any new undefined symbols, we need to make
5101 another pass through the archive in order to see whether
5102 they can be defined. FIXME: This isn't perfect, because
5103 common symbols wind up on undefs_tail and because an
5104 undefined symbol which is defined later on in this pass
5105 does not require another pass. This isn't a bug, but it
5106 does make the code less efficient than it could be. */
5107 if (undefs_tail != info->hash->undefs_tail)
5110 /* Look backward to mark all symbols from this object file
5111 which we have already seen in this pass. */
5115 included[mark] = TRUE;
5120 while (symdefs[mark].file_offset == symdef->file_offset);
5122 /* We mark subsequent symbols from this object file as we go
5123 on through the loop. */
5124 last = symdef->file_offset;
5135 if (defined != NULL)
5137 if (included != NULL)
5142 /* Given an ELF BFD, add symbols to the global hash table as
5146 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5148 switch (bfd_get_format (abfd))
5151 return elf_link_add_object_symbols (abfd, info);
5153 return elf_link_add_archive_symbols (abfd, info);
5155 bfd_set_error (bfd_error_wrong_format);
5160 struct hash_codes_info
5162 unsigned long *hashcodes;
5166 /* This function will be called though elf_link_hash_traverse to store
5167 all hash value of the exported symbols in an array. */
5170 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5172 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5178 /* Ignore indirect symbols. These are added by the versioning code. */
5179 if (h->dynindx == -1)
5182 name = h->root.root.string;
5183 p = strchr (name, ELF_VER_CHR);
5186 alc = (char *) bfd_malloc (p - name + 1);
5192 memcpy (alc, name, p - name);
5193 alc[p - name] = '\0';
5197 /* Compute the hash value. */
5198 ha = bfd_elf_hash (name);
5200 /* Store the found hash value in the array given as the argument. */
5201 *(inf->hashcodes)++ = ha;
5203 /* And store it in the struct so that we can put it in the hash table
5205 h->u.elf_hash_value = ha;
5213 struct collect_gnu_hash_codes
5216 const struct elf_backend_data *bed;
5217 unsigned long int nsyms;
5218 unsigned long int maskbits;
5219 unsigned long int *hashcodes;
5220 unsigned long int *hashval;
5221 unsigned long int *indx;
5222 unsigned long int *counts;
5225 long int min_dynindx;
5226 unsigned long int bucketcount;
5227 unsigned long int symindx;
5228 long int local_indx;
5229 long int shift1, shift2;
5230 unsigned long int mask;
5234 /* This function will be called though elf_link_hash_traverse to store
5235 all hash value of the exported symbols in an array. */
5238 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5240 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5246 /* Ignore indirect symbols. These are added by the versioning code. */
5247 if (h->dynindx == -1)
5250 /* Ignore also local symbols and undefined symbols. */
5251 if (! (*s->bed->elf_hash_symbol) (h))
5254 name = h->root.root.string;
5255 p = strchr (name, ELF_VER_CHR);
5258 alc = (char *) bfd_malloc (p - name + 1);
5264 memcpy (alc, name, p - name);
5265 alc[p - name] = '\0';
5269 /* Compute the hash value. */
5270 ha = bfd_elf_gnu_hash (name);
5272 /* Store the found hash value in the array for compute_bucket_count,
5273 and also for .dynsym reordering purposes. */
5274 s->hashcodes[s->nsyms] = ha;
5275 s->hashval[h->dynindx] = ha;
5277 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5278 s->min_dynindx = h->dynindx;
5286 /* This function will be called though elf_link_hash_traverse to do
5287 final dynaminc symbol renumbering. */
5290 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5292 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5293 unsigned long int bucket;
5294 unsigned long int val;
5296 /* Ignore indirect symbols. */
5297 if (h->dynindx == -1)
5300 /* Ignore also local symbols and undefined symbols. */
5301 if (! (*s->bed->elf_hash_symbol) (h))
5303 if (h->dynindx >= s->min_dynindx)
5304 h->dynindx = s->local_indx++;
5308 bucket = s->hashval[h->dynindx] % s->bucketcount;
5309 val = (s->hashval[h->dynindx] >> s->shift1)
5310 & ((s->maskbits >> s->shift1) - 1);
5311 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5313 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5314 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5315 if (s->counts[bucket] == 1)
5316 /* Last element terminates the chain. */
5318 bfd_put_32 (s->output_bfd, val,
5319 s->contents + (s->indx[bucket] - s->symindx) * 4);
5320 --s->counts[bucket];
5321 h->dynindx = s->indx[bucket]++;
5325 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5328 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5330 return !(h->forced_local
5331 || h->root.type == bfd_link_hash_undefined
5332 || h->root.type == bfd_link_hash_undefweak
5333 || ((h->root.type == bfd_link_hash_defined
5334 || h->root.type == bfd_link_hash_defweak)
5335 && h->root.u.def.section->output_section == NULL));
5338 /* Array used to determine the number of hash table buckets to use
5339 based on the number of symbols there are. If there are fewer than
5340 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5341 fewer than 37 we use 17 buckets, and so forth. We never use more
5342 than 32771 buckets. */
5344 static const size_t elf_buckets[] =
5346 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5350 /* Compute bucket count for hashing table. We do not use a static set
5351 of possible tables sizes anymore. Instead we determine for all
5352 possible reasonable sizes of the table the outcome (i.e., the
5353 number of collisions etc) and choose the best solution. The
5354 weighting functions are not too simple to allow the table to grow
5355 without bounds. Instead one of the weighting factors is the size.
5356 Therefore the result is always a good payoff between few collisions
5357 (= short chain lengths) and table size. */
5359 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5360 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5361 unsigned long int nsyms,
5364 size_t best_size = 0;
5365 unsigned long int i;
5367 /* We have a problem here. The following code to optimize the table
5368 size requires an integer type with more the 32 bits. If
5369 BFD_HOST_U_64_BIT is set we know about such a type. */
5370 #ifdef BFD_HOST_U_64_BIT
5375 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5376 bfd *dynobj = elf_hash_table (info)->dynobj;
5377 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5378 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5379 unsigned long int *counts;
5381 unsigned int no_improvement_count = 0;
5383 /* Possible optimization parameters: if we have NSYMS symbols we say
5384 that the hashing table must at least have NSYMS/4 and at most
5386 minsize = nsyms / 4;
5389 best_size = maxsize = nsyms * 2;
5394 if ((best_size & 31) == 0)
5398 /* Create array where we count the collisions in. We must use bfd_malloc
5399 since the size could be large. */
5401 amt *= sizeof (unsigned long int);
5402 counts = (unsigned long int *) bfd_malloc (amt);
5406 /* Compute the "optimal" size for the hash table. The criteria is a
5407 minimal chain length. The minor criteria is (of course) the size
5409 for (i = minsize; i < maxsize; ++i)
5411 /* Walk through the array of hashcodes and count the collisions. */
5412 BFD_HOST_U_64_BIT max;
5413 unsigned long int j;
5414 unsigned long int fact;
5416 if (gnu_hash && (i & 31) == 0)
5419 memset (counts, '\0', i * sizeof (unsigned long int));
5421 /* Determine how often each hash bucket is used. */
5422 for (j = 0; j < nsyms; ++j)
5423 ++counts[hashcodes[j] % i];
5425 /* For the weight function we need some information about the
5426 pagesize on the target. This is information need not be 100%
5427 accurate. Since this information is not available (so far) we
5428 define it here to a reasonable default value. If it is crucial
5429 to have a better value some day simply define this value. */
5430 # ifndef BFD_TARGET_PAGESIZE
5431 # define BFD_TARGET_PAGESIZE (4096)
5434 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5436 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5439 /* Variant 1: optimize for short chains. We add the squares
5440 of all the chain lengths (which favors many small chain
5441 over a few long chains). */
5442 for (j = 0; j < i; ++j)
5443 max += counts[j] * counts[j];
5445 /* This adds penalties for the overall size of the table. */
5446 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5449 /* Variant 2: Optimize a lot more for small table. Here we
5450 also add squares of the size but we also add penalties for
5451 empty slots (the +1 term). */
5452 for (j = 0; j < i; ++j)
5453 max += (1 + counts[j]) * (1 + counts[j]);
5455 /* The overall size of the table is considered, but not as
5456 strong as in variant 1, where it is squared. */
5457 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5461 /* Compare with current best results. */
5462 if (max < best_chlen)
5466 no_improvement_count = 0;
5468 /* PR 11843: Avoid futile long searches for the best bucket size
5469 when there are a large number of symbols. */
5470 else if (++no_improvement_count == 100)
5477 #endif /* defined (BFD_HOST_U_64_BIT) */
5479 /* This is the fallback solution if no 64bit type is available or if we
5480 are not supposed to spend much time on optimizations. We select the
5481 bucket count using a fixed set of numbers. */
5482 for (i = 0; elf_buckets[i] != 0; i++)
5484 best_size = elf_buckets[i];
5485 if (nsyms < elf_buckets[i + 1])
5488 if (gnu_hash && best_size < 2)
5495 /* Size any SHT_GROUP section for ld -r. */
5498 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5502 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
5503 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5504 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5509 /* Set up the sizes and contents of the ELF dynamic sections. This is
5510 called by the ELF linker emulation before_allocation routine. We
5511 must set the sizes of the sections before the linker sets the
5512 addresses of the various sections. */
5515 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5518 const char *filter_shlib,
5520 const char *depaudit,
5521 const char * const *auxiliary_filters,
5522 struct bfd_link_info *info,
5523 asection **sinterpptr)
5525 bfd_size_type soname_indx;
5527 const struct elf_backend_data *bed;
5528 struct elf_info_failed asvinfo;
5532 soname_indx = (bfd_size_type) -1;
5534 if (!is_elf_hash_table (info->hash))
5537 bed = get_elf_backend_data (output_bfd);
5538 if (info->execstack)
5539 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
5540 else if (info->noexecstack)
5541 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W;
5545 asection *notesec = NULL;
5548 for (inputobj = info->input_bfds;
5550 inputobj = inputobj->link_next)
5555 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5557 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5560 if (s->flags & SEC_CODE)
5564 else if (bed->default_execstack)
5569 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec;
5570 if (exec && info->relocatable
5571 && notesec->output_section != bfd_abs_section_ptr)
5572 notesec->output_section->flags |= SEC_CODE;
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 dynobj = elf_hash_table (info)->dynobj;
5595 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5597 struct elf_info_failed eif;
5598 struct elf_link_hash_entry *h;
5600 struct bfd_elf_version_tree *t;
5601 struct bfd_elf_version_expr *d;
5603 bfd_boolean all_defined;
5605 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5606 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5610 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5612 if (soname_indx == (bfd_size_type) -1
5613 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5619 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5621 info->flags |= DF_SYMBOLIC;
5628 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5630 if (indx == (bfd_size_type) -1
5631 || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))
5634 if (info->new_dtags)
5636 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
5637 if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx))
5642 if (filter_shlib != NULL)
5646 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5647 filter_shlib, TRUE);
5648 if (indx == (bfd_size_type) -1
5649 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5653 if (auxiliary_filters != NULL)
5655 const char * const *p;
5657 for (p = auxiliary_filters; *p != NULL; p++)
5661 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5663 if (indx == (bfd_size_type) -1
5664 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5673 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5675 if (indx == (bfd_size_type) -1
5676 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5680 if (depaudit != NULL)
5684 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5686 if (indx == (bfd_size_type) -1
5687 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5694 /* If we are supposed to export all symbols into the dynamic symbol
5695 table (this is not the normal case), then do so. */
5696 if (info->export_dynamic
5697 || (info->executable && info->dynamic))
5699 elf_link_hash_traverse (elf_hash_table (info),
5700 _bfd_elf_export_symbol,
5706 /* Make all global versions with definition. */
5707 for (t = info->version_info; t != NULL; t = t->next)
5708 for (d = t->globals.list; d != NULL; d = d->next)
5709 if (!d->symver && d->literal)
5711 const char *verstr, *name;
5712 size_t namelen, verlen, newlen;
5713 char *newname, *p, leading_char;
5714 struct elf_link_hash_entry *newh;
5716 leading_char = bfd_get_symbol_leading_char (output_bfd);
5718 namelen = strlen (name) + (leading_char != '\0');
5720 verlen = strlen (verstr);
5721 newlen = namelen + verlen + 3;
5723 newname = (char *) bfd_malloc (newlen);
5724 if (newname == NULL)
5726 newname[0] = leading_char;
5727 memcpy (newname + (leading_char != '\0'), name, namelen);
5729 /* Check the hidden versioned definition. */
5730 p = newname + namelen;
5732 memcpy (p, verstr, verlen + 1);
5733 newh = elf_link_hash_lookup (elf_hash_table (info),
5734 newname, FALSE, FALSE,
5737 || (newh->root.type != bfd_link_hash_defined
5738 && newh->root.type != bfd_link_hash_defweak))
5740 /* Check the default versioned definition. */
5742 memcpy (p, verstr, verlen + 1);
5743 newh = elf_link_hash_lookup (elf_hash_table (info),
5744 newname, FALSE, FALSE,
5749 /* Mark this version if there is a definition and it is
5750 not defined in a shared object. */
5752 && !newh->def_dynamic
5753 && (newh->root.type == bfd_link_hash_defined
5754 || newh->root.type == bfd_link_hash_defweak))
5758 /* Attach all the symbols to their version information. */
5759 asvinfo.info = info;
5760 asvinfo.failed = FALSE;
5762 elf_link_hash_traverse (elf_hash_table (info),
5763 _bfd_elf_link_assign_sym_version,
5768 if (!info->allow_undefined_version)
5770 /* Check if all global versions have a definition. */
5772 for (t = info->version_info; t != NULL; t = t->next)
5773 for (d = t->globals.list; d != NULL; d = d->next)
5774 if (d->literal && !d->symver && !d->script)
5776 (*_bfd_error_handler)
5777 (_("%s: undefined version: %s"),
5778 d->pattern, t->name);
5779 all_defined = FALSE;
5784 bfd_set_error (bfd_error_bad_value);
5789 /* Find all symbols which were defined in a dynamic object and make
5790 the backend pick a reasonable value for them. */
5791 elf_link_hash_traverse (elf_hash_table (info),
5792 _bfd_elf_adjust_dynamic_symbol,
5797 /* Add some entries to the .dynamic section. We fill in some of the
5798 values later, in bfd_elf_final_link, but we must add the entries
5799 now so that we know the final size of the .dynamic section. */
5801 /* If there are initialization and/or finalization functions to
5802 call then add the corresponding DT_INIT/DT_FINI entries. */
5803 h = (info->init_function
5804 ? elf_link_hash_lookup (elf_hash_table (info),
5805 info->init_function, FALSE,
5812 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5815 h = (info->fini_function
5816 ? elf_link_hash_lookup (elf_hash_table (info),
5817 info->fini_function, FALSE,
5824 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5828 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5829 if (s != NULL && s->linker_has_input)
5831 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5832 if (! info->executable)
5837 for (sub = info->input_bfds; sub != NULL;
5838 sub = sub->link_next)
5839 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5840 for (o = sub->sections; o != NULL; o = o->next)
5841 if (elf_section_data (o)->this_hdr.sh_type
5842 == SHT_PREINIT_ARRAY)
5844 (*_bfd_error_handler)
5845 (_("%B: .preinit_array section is not allowed in DSO"),
5850 bfd_set_error (bfd_error_nonrepresentable_section);
5854 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5855 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5858 s = bfd_get_section_by_name (output_bfd, ".init_array");
5859 if (s != NULL && s->linker_has_input)
5861 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5862 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5865 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5866 if (s != NULL && s->linker_has_input)
5868 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5869 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5873 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
5874 /* If .dynstr is excluded from the link, we don't want any of
5875 these tags. Strictly, we should be checking each section
5876 individually; This quick check covers for the case where
5877 someone does a /DISCARD/ : { *(*) }. */
5878 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5880 bfd_size_type strsize;
5882 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5883 if ((info->emit_hash
5884 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5885 || (info->emit_gnu_hash
5886 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5887 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5888 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5889 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5890 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5891 bed->s->sizeof_sym))
5896 /* The backend must work out the sizes of all the other dynamic
5899 && bed->elf_backend_size_dynamic_sections != NULL
5900 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5903 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5906 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5908 unsigned long section_sym_count;
5909 struct bfd_elf_version_tree *verdefs;
5912 /* Set up the version definition section. */
5913 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
5914 BFD_ASSERT (s != NULL);
5916 /* We may have created additional version definitions if we are
5917 just linking a regular application. */
5918 verdefs = info->version_info;
5920 /* Skip anonymous version tag. */
5921 if (verdefs != NULL && verdefs->vernum == 0)
5922 verdefs = verdefs->next;
5924 if (verdefs == NULL && !info->create_default_symver)
5925 s->flags |= SEC_EXCLUDE;
5930 struct bfd_elf_version_tree *t;
5932 Elf_Internal_Verdef def;
5933 Elf_Internal_Verdaux defaux;
5934 struct bfd_link_hash_entry *bh;
5935 struct elf_link_hash_entry *h;
5941 /* Make space for the base version. */
5942 size += sizeof (Elf_External_Verdef);
5943 size += sizeof (Elf_External_Verdaux);
5946 /* Make space for the default version. */
5947 if (info->create_default_symver)
5949 size += sizeof (Elf_External_Verdef);
5953 for (t = verdefs; t != NULL; t = t->next)
5955 struct bfd_elf_version_deps *n;
5957 /* Don't emit base version twice. */
5961 size += sizeof (Elf_External_Verdef);
5962 size += sizeof (Elf_External_Verdaux);
5965 for (n = t->deps; n != NULL; n = n->next)
5966 size += sizeof (Elf_External_Verdaux);
5970 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
5971 if (s->contents == NULL && s->size != 0)
5974 /* Fill in the version definition section. */
5978 def.vd_version = VER_DEF_CURRENT;
5979 def.vd_flags = VER_FLG_BASE;
5982 if (info->create_default_symver)
5984 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
5985 def.vd_next = sizeof (Elf_External_Verdef);
5989 def.vd_aux = sizeof (Elf_External_Verdef);
5990 def.vd_next = (sizeof (Elf_External_Verdef)
5991 + sizeof (Elf_External_Verdaux));
5994 if (soname_indx != (bfd_size_type) -1)
5996 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5998 def.vd_hash = bfd_elf_hash (soname);
5999 defaux.vda_name = soname_indx;
6006 name = lbasename (output_bfd->filename);
6007 def.vd_hash = bfd_elf_hash (name);
6008 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6010 if (indx == (bfd_size_type) -1)
6012 defaux.vda_name = indx;
6014 defaux.vda_next = 0;
6016 _bfd_elf_swap_verdef_out (output_bfd, &def,
6017 (Elf_External_Verdef *) p);
6018 p += sizeof (Elf_External_Verdef);
6019 if (info->create_default_symver)
6021 /* Add a symbol representing this version. */
6023 if (! (_bfd_generic_link_add_one_symbol
6024 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6026 get_elf_backend_data (dynobj)->collect, &bh)))
6028 h = (struct elf_link_hash_entry *) bh;
6031 h->type = STT_OBJECT;
6032 h->verinfo.vertree = NULL;
6034 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6037 /* Create a duplicate of the base version with the same
6038 aux block, but different flags. */
6041 def.vd_aux = sizeof (Elf_External_Verdef);
6043 def.vd_next = (sizeof (Elf_External_Verdef)
6044 + sizeof (Elf_External_Verdaux));
6047 _bfd_elf_swap_verdef_out (output_bfd, &def,
6048 (Elf_External_Verdef *) p);
6049 p += sizeof (Elf_External_Verdef);
6051 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6052 (Elf_External_Verdaux *) p);
6053 p += sizeof (Elf_External_Verdaux);
6055 for (t = verdefs; t != NULL; t = t->next)
6058 struct bfd_elf_version_deps *n;
6060 /* Don't emit the base version twice. */
6065 for (n = t->deps; n != NULL; n = n->next)
6068 /* Add a symbol representing this version. */
6070 if (! (_bfd_generic_link_add_one_symbol
6071 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6073 get_elf_backend_data (dynobj)->collect, &bh)))
6075 h = (struct elf_link_hash_entry *) bh;
6078 h->type = STT_OBJECT;
6079 h->verinfo.vertree = t;
6081 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6084 def.vd_version = VER_DEF_CURRENT;
6086 if (t->globals.list == NULL
6087 && t->locals.list == NULL
6089 def.vd_flags |= VER_FLG_WEAK;
6090 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6091 def.vd_cnt = cdeps + 1;
6092 def.vd_hash = bfd_elf_hash (t->name);
6093 def.vd_aux = sizeof (Elf_External_Verdef);
6096 /* If a basever node is next, it *must* be the last node in
6097 the chain, otherwise Verdef construction breaks. */
6098 if (t->next != NULL && t->next->vernum == 0)
6099 BFD_ASSERT (t->next->next == NULL);
6101 if (t->next != NULL && t->next->vernum != 0)
6102 def.vd_next = (sizeof (Elf_External_Verdef)
6103 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6105 _bfd_elf_swap_verdef_out (output_bfd, &def,
6106 (Elf_External_Verdef *) p);
6107 p += sizeof (Elf_External_Verdef);
6109 defaux.vda_name = h->dynstr_index;
6110 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6112 defaux.vda_next = 0;
6113 if (t->deps != NULL)
6114 defaux.vda_next = sizeof (Elf_External_Verdaux);
6115 t->name_indx = defaux.vda_name;
6117 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6118 (Elf_External_Verdaux *) p);
6119 p += sizeof (Elf_External_Verdaux);
6121 for (n = t->deps; n != NULL; n = n->next)
6123 if (n->version_needed == NULL)
6125 /* This can happen if there was an error in the
6127 defaux.vda_name = 0;
6131 defaux.vda_name = n->version_needed->name_indx;
6132 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6135 if (n->next == NULL)
6136 defaux.vda_next = 0;
6138 defaux.vda_next = sizeof (Elf_External_Verdaux);
6140 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6141 (Elf_External_Verdaux *) p);
6142 p += sizeof (Elf_External_Verdaux);
6146 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6147 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6150 elf_tdata (output_bfd)->cverdefs = cdefs;
6153 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6155 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6158 else if (info->flags & DF_BIND_NOW)
6160 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6166 if (info->executable)
6167 info->flags_1 &= ~ (DF_1_INITFIRST
6170 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6174 /* Work out the size of the version reference section. */
6176 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6177 BFD_ASSERT (s != NULL);
6179 struct elf_find_verdep_info sinfo;
6182 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6183 if (sinfo.vers == 0)
6185 sinfo.failed = FALSE;
6187 elf_link_hash_traverse (elf_hash_table (info),
6188 _bfd_elf_link_find_version_dependencies,
6193 if (elf_tdata (output_bfd)->verref == NULL)
6194 s->flags |= SEC_EXCLUDE;
6197 Elf_Internal_Verneed *t;
6202 /* Build the version dependency section. */
6205 for (t = elf_tdata (output_bfd)->verref;
6209 Elf_Internal_Vernaux *a;
6211 size += sizeof (Elf_External_Verneed);
6213 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6214 size += sizeof (Elf_External_Vernaux);
6218 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6219 if (s->contents == NULL)
6223 for (t = elf_tdata (output_bfd)->verref;
6228 Elf_Internal_Vernaux *a;
6232 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6235 t->vn_version = VER_NEED_CURRENT;
6237 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6238 elf_dt_name (t->vn_bfd) != NULL
6239 ? elf_dt_name (t->vn_bfd)
6240 : lbasename (t->vn_bfd->filename),
6242 if (indx == (bfd_size_type) -1)
6245 t->vn_aux = sizeof (Elf_External_Verneed);
6246 if (t->vn_nextref == NULL)
6249 t->vn_next = (sizeof (Elf_External_Verneed)
6250 + caux * sizeof (Elf_External_Vernaux));
6252 _bfd_elf_swap_verneed_out (output_bfd, t,
6253 (Elf_External_Verneed *) p);
6254 p += sizeof (Elf_External_Verneed);
6256 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6258 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6259 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6260 a->vna_nodename, FALSE);
6261 if (indx == (bfd_size_type) -1)
6264 if (a->vna_nextptr == NULL)
6267 a->vna_next = sizeof (Elf_External_Vernaux);
6269 _bfd_elf_swap_vernaux_out (output_bfd, a,
6270 (Elf_External_Vernaux *) p);
6271 p += sizeof (Elf_External_Vernaux);
6275 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6276 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6279 elf_tdata (output_bfd)->cverrefs = crefs;
6283 if ((elf_tdata (output_bfd)->cverrefs == 0
6284 && elf_tdata (output_bfd)->cverdefs == 0)
6285 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6286 §ion_sym_count) == 0)
6288 s = bfd_get_linker_section (dynobj, ".gnu.version");
6289 s->flags |= SEC_EXCLUDE;
6295 /* Find the first non-excluded output section. We'll use its
6296 section symbol for some emitted relocs. */
6298 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6302 for (s = output_bfd->sections; s != NULL; s = s->next)
6303 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6304 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6306 elf_hash_table (info)->text_index_section = s;
6311 /* Find two non-excluded output sections, one for code, one for data.
6312 We'll use their section symbols for some emitted relocs. */
6314 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6318 /* Data first, since setting text_index_section changes
6319 _bfd_elf_link_omit_section_dynsym. */
6320 for (s = output_bfd->sections; s != NULL; s = s->next)
6321 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6322 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6324 elf_hash_table (info)->data_index_section = s;
6328 for (s = output_bfd->sections; s != NULL; s = s->next)
6329 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6330 == (SEC_ALLOC | SEC_READONLY))
6331 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6333 elf_hash_table (info)->text_index_section = s;
6337 if (elf_hash_table (info)->text_index_section == NULL)
6338 elf_hash_table (info)->text_index_section
6339 = elf_hash_table (info)->data_index_section;
6343 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6345 const struct elf_backend_data *bed;
6347 if (!is_elf_hash_table (info->hash))
6350 bed = get_elf_backend_data (output_bfd);
6351 (*bed->elf_backend_init_index_section) (output_bfd, info);
6353 if (elf_hash_table (info)->dynamic_sections_created)
6357 bfd_size_type dynsymcount;
6358 unsigned long section_sym_count;
6359 unsigned int dtagcount;
6361 dynobj = elf_hash_table (info)->dynobj;
6363 /* Assign dynsym indicies. In a shared library we generate a
6364 section symbol for each output section, which come first.
6365 Next come all of the back-end allocated local dynamic syms,
6366 followed by the rest of the global symbols. */
6368 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6369 §ion_sym_count);
6371 /* Work out the size of the symbol version section. */
6372 s = bfd_get_linker_section (dynobj, ".gnu.version");
6373 BFD_ASSERT (s != NULL);
6374 if (dynsymcount != 0
6375 && (s->flags & SEC_EXCLUDE) == 0)
6377 s->size = dynsymcount * sizeof (Elf_External_Versym);
6378 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6379 if (s->contents == NULL)
6382 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6386 /* Set the size of the .dynsym and .hash sections. We counted
6387 the number of dynamic symbols in elf_link_add_object_symbols.
6388 We will build the contents of .dynsym and .hash when we build
6389 the final symbol table, because until then we do not know the
6390 correct value to give the symbols. We built the .dynstr
6391 section as we went along in elf_link_add_object_symbols. */
6392 s = bfd_get_linker_section (dynobj, ".dynsym");
6393 BFD_ASSERT (s != NULL);
6394 s->size = dynsymcount * bed->s->sizeof_sym;
6396 if (dynsymcount != 0)
6398 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6399 if (s->contents == NULL)
6402 /* The first entry in .dynsym is a dummy symbol.
6403 Clear all the section syms, in case we don't output them all. */
6404 ++section_sym_count;
6405 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6408 elf_hash_table (info)->bucketcount = 0;
6410 /* Compute the size of the hashing table. As a side effect this
6411 computes the hash values for all the names we export. */
6412 if (info->emit_hash)
6414 unsigned long int *hashcodes;
6415 struct hash_codes_info hashinf;
6417 unsigned long int nsyms;
6419 size_t hash_entry_size;
6421 /* Compute the hash values for all exported symbols. At the same
6422 time store the values in an array so that we could use them for
6424 amt = dynsymcount * sizeof (unsigned long int);
6425 hashcodes = (unsigned long int *) bfd_malloc (amt);
6426 if (hashcodes == NULL)
6428 hashinf.hashcodes = hashcodes;
6429 hashinf.error = FALSE;
6431 /* Put all hash values in HASHCODES. */
6432 elf_link_hash_traverse (elf_hash_table (info),
6433 elf_collect_hash_codes, &hashinf);
6440 nsyms = hashinf.hashcodes - hashcodes;
6442 = compute_bucket_count (info, hashcodes, nsyms, 0);
6445 if (bucketcount == 0)
6448 elf_hash_table (info)->bucketcount = bucketcount;
6450 s = bfd_get_linker_section (dynobj, ".hash");
6451 BFD_ASSERT (s != NULL);
6452 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6453 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6454 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6455 if (s->contents == NULL)
6458 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6459 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6460 s->contents + hash_entry_size);
6463 if (info->emit_gnu_hash)
6466 unsigned char *contents;
6467 struct collect_gnu_hash_codes cinfo;
6471 memset (&cinfo, 0, sizeof (cinfo));
6473 /* Compute the hash values for all exported symbols. At the same
6474 time store the values in an array so that we could use them for
6476 amt = dynsymcount * 2 * sizeof (unsigned long int);
6477 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6478 if (cinfo.hashcodes == NULL)
6481 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6482 cinfo.min_dynindx = -1;
6483 cinfo.output_bfd = output_bfd;
6486 /* Put all hash values in HASHCODES. */
6487 elf_link_hash_traverse (elf_hash_table (info),
6488 elf_collect_gnu_hash_codes, &cinfo);
6491 free (cinfo.hashcodes);
6496 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6498 if (bucketcount == 0)
6500 free (cinfo.hashcodes);
6504 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6505 BFD_ASSERT (s != NULL);
6507 if (cinfo.nsyms == 0)
6509 /* Empty .gnu.hash section is special. */
6510 BFD_ASSERT (cinfo.min_dynindx == -1);
6511 free (cinfo.hashcodes);
6512 s->size = 5 * 4 + bed->s->arch_size / 8;
6513 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6514 if (contents == NULL)
6516 s->contents = contents;
6517 /* 1 empty bucket. */
6518 bfd_put_32 (output_bfd, 1, contents);
6519 /* SYMIDX above the special symbol 0. */
6520 bfd_put_32 (output_bfd, 1, contents + 4);
6521 /* Just one word for bitmask. */
6522 bfd_put_32 (output_bfd, 1, contents + 8);
6523 /* Only hash fn bloom filter. */
6524 bfd_put_32 (output_bfd, 0, contents + 12);
6525 /* No hashes are valid - empty bitmask. */
6526 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6527 /* No hashes in the only bucket. */
6528 bfd_put_32 (output_bfd, 0,
6529 contents + 16 + bed->s->arch_size / 8);
6533 unsigned long int maskwords, maskbitslog2, x;
6534 BFD_ASSERT (cinfo.min_dynindx != -1);
6538 while ((x >>= 1) != 0)
6540 if (maskbitslog2 < 3)
6542 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6543 maskbitslog2 = maskbitslog2 + 3;
6545 maskbitslog2 = maskbitslog2 + 2;
6546 if (bed->s->arch_size == 64)
6548 if (maskbitslog2 == 5)
6554 cinfo.mask = (1 << cinfo.shift1) - 1;
6555 cinfo.shift2 = maskbitslog2;
6556 cinfo.maskbits = 1 << maskbitslog2;
6557 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6558 amt = bucketcount * sizeof (unsigned long int) * 2;
6559 amt += maskwords * sizeof (bfd_vma);
6560 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6561 if (cinfo.bitmask == NULL)
6563 free (cinfo.hashcodes);
6567 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6568 cinfo.indx = cinfo.counts + bucketcount;
6569 cinfo.symindx = dynsymcount - cinfo.nsyms;
6570 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6572 /* Determine how often each hash bucket is used. */
6573 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6574 for (i = 0; i < cinfo.nsyms; ++i)
6575 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6577 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6578 if (cinfo.counts[i] != 0)
6580 cinfo.indx[i] = cnt;
6581 cnt += cinfo.counts[i];
6583 BFD_ASSERT (cnt == dynsymcount);
6584 cinfo.bucketcount = bucketcount;
6585 cinfo.local_indx = cinfo.min_dynindx;
6587 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6588 s->size += cinfo.maskbits / 8;
6589 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6590 if (contents == NULL)
6592 free (cinfo.bitmask);
6593 free (cinfo.hashcodes);
6597 s->contents = contents;
6598 bfd_put_32 (output_bfd, bucketcount, contents);
6599 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6600 bfd_put_32 (output_bfd, maskwords, contents + 8);
6601 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6602 contents += 16 + cinfo.maskbits / 8;
6604 for (i = 0; i < bucketcount; ++i)
6606 if (cinfo.counts[i] == 0)
6607 bfd_put_32 (output_bfd, 0, contents);
6609 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6613 cinfo.contents = contents;
6615 /* Renumber dynamic symbols, populate .gnu.hash section. */
6616 elf_link_hash_traverse (elf_hash_table (info),
6617 elf_renumber_gnu_hash_syms, &cinfo);
6619 contents = s->contents + 16;
6620 for (i = 0; i < maskwords; ++i)
6622 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6624 contents += bed->s->arch_size / 8;
6627 free (cinfo.bitmask);
6628 free (cinfo.hashcodes);
6632 s = bfd_get_linker_section (dynobj, ".dynstr");
6633 BFD_ASSERT (s != NULL);
6635 elf_finalize_dynstr (output_bfd, info);
6637 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6639 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6640 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6647 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6650 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6653 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6654 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6657 /* Finish SHF_MERGE section merging. */
6660 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6665 if (!is_elf_hash_table (info->hash))
6668 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6669 if ((ibfd->flags & DYNAMIC) == 0)
6670 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6671 if ((sec->flags & SEC_MERGE) != 0
6672 && !bfd_is_abs_section (sec->output_section))
6674 struct bfd_elf_section_data *secdata;
6676 secdata = elf_section_data (sec);
6677 if (! _bfd_add_merge_section (abfd,
6678 &elf_hash_table (info)->merge_info,
6679 sec, &secdata->sec_info))
6681 else if (secdata->sec_info)
6682 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6685 if (elf_hash_table (info)->merge_info != NULL)
6686 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6687 merge_sections_remove_hook);
6691 /* Create an entry in an ELF linker hash table. */
6693 struct bfd_hash_entry *
6694 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6695 struct bfd_hash_table *table,
6698 /* Allocate the structure if it has not already been allocated by a
6702 entry = (struct bfd_hash_entry *)
6703 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6708 /* Call the allocation method of the superclass. */
6709 entry = _bfd_link_hash_newfunc (entry, table, string);
6712 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6713 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6715 /* Set local fields. */
6718 ret->got = htab->init_got_refcount;
6719 ret->plt = htab->init_plt_refcount;
6720 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6721 - offsetof (struct elf_link_hash_entry, size)));
6722 /* Assume that we have been called by a non-ELF symbol reader.
6723 This flag is then reset by the code which reads an ELF input
6724 file. This ensures that a symbol created by a non-ELF symbol
6725 reader will have the flag set correctly. */
6732 /* Copy data from an indirect symbol to its direct symbol, hiding the
6733 old indirect symbol. Also used for copying flags to a weakdef. */
6736 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6737 struct elf_link_hash_entry *dir,
6738 struct elf_link_hash_entry *ind)
6740 struct elf_link_hash_table *htab;
6742 /* Copy down any references that we may have already seen to the
6743 symbol which just became indirect. */
6745 dir->ref_dynamic |= ind->ref_dynamic;
6746 dir->ref_regular |= ind->ref_regular;
6747 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6748 dir->non_got_ref |= ind->non_got_ref;
6749 dir->needs_plt |= ind->needs_plt;
6750 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6752 if (ind->root.type != bfd_link_hash_indirect)
6755 /* Copy over the global and procedure linkage table refcount entries.
6756 These may have been already set up by a check_relocs routine. */
6757 htab = elf_hash_table (info);
6758 if (ind->got.refcount > htab->init_got_refcount.refcount)
6760 if (dir->got.refcount < 0)
6761 dir->got.refcount = 0;
6762 dir->got.refcount += ind->got.refcount;
6763 ind->got.refcount = htab->init_got_refcount.refcount;
6766 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6768 if (dir->plt.refcount < 0)
6769 dir->plt.refcount = 0;
6770 dir->plt.refcount += ind->plt.refcount;
6771 ind->plt.refcount = htab->init_plt_refcount.refcount;
6774 if (ind->dynindx != -1)
6776 if (dir->dynindx != -1)
6777 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6778 dir->dynindx = ind->dynindx;
6779 dir->dynstr_index = ind->dynstr_index;
6781 ind->dynstr_index = 0;
6786 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6787 struct elf_link_hash_entry *h,
6788 bfd_boolean force_local)
6790 /* STT_GNU_IFUNC symbol must go through PLT. */
6791 if (h->type != STT_GNU_IFUNC)
6793 h->plt = elf_hash_table (info)->init_plt_offset;
6798 h->forced_local = 1;
6799 if (h->dynindx != -1)
6802 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6808 /* Initialize an ELF linker hash table. */
6811 _bfd_elf_link_hash_table_init
6812 (struct elf_link_hash_table *table,
6814 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6815 struct bfd_hash_table *,
6817 unsigned int entsize,
6818 enum elf_target_id target_id)
6821 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6823 memset (table, 0, sizeof * table);
6824 table->init_got_refcount.refcount = can_refcount - 1;
6825 table->init_plt_refcount.refcount = can_refcount - 1;
6826 table->init_got_offset.offset = -(bfd_vma) 1;
6827 table->init_plt_offset.offset = -(bfd_vma) 1;
6828 /* The first dynamic symbol is a dummy. */
6829 table->dynsymcount = 1;
6831 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6833 table->root.type = bfd_link_elf_hash_table;
6834 table->hash_table_id = target_id;
6839 /* Create an ELF linker hash table. */
6841 struct bfd_link_hash_table *
6842 _bfd_elf_link_hash_table_create (bfd *abfd)
6844 struct elf_link_hash_table *ret;
6845 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6847 ret = (struct elf_link_hash_table *) bfd_malloc (amt);
6851 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6852 sizeof (struct elf_link_hash_entry),
6862 /* This is a hook for the ELF emulation code in the generic linker to
6863 tell the backend linker what file name to use for the DT_NEEDED
6864 entry for a dynamic object. */
6867 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6869 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6870 && bfd_get_format (abfd) == bfd_object)
6871 elf_dt_name (abfd) = name;
6875 bfd_elf_get_dyn_lib_class (bfd *abfd)
6878 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6879 && bfd_get_format (abfd) == bfd_object)
6880 lib_class = elf_dyn_lib_class (abfd);
6887 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6889 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6890 && bfd_get_format (abfd) == bfd_object)
6891 elf_dyn_lib_class (abfd) = lib_class;
6894 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6895 the linker ELF emulation code. */
6897 struct bfd_link_needed_list *
6898 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6899 struct bfd_link_info *info)
6901 if (! is_elf_hash_table (info->hash))
6903 return elf_hash_table (info)->needed;
6906 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6907 hook for the linker ELF emulation code. */
6909 struct bfd_link_needed_list *
6910 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6911 struct bfd_link_info *info)
6913 if (! is_elf_hash_table (info->hash))
6915 return elf_hash_table (info)->runpath;
6918 /* Get the name actually used for a dynamic object for a link. This
6919 is the SONAME entry if there is one. Otherwise, it is the string
6920 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6923 bfd_elf_get_dt_soname (bfd *abfd)
6925 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6926 && bfd_get_format (abfd) == bfd_object)
6927 return elf_dt_name (abfd);
6931 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6932 the ELF linker emulation code. */
6935 bfd_elf_get_bfd_needed_list (bfd *abfd,
6936 struct bfd_link_needed_list **pneeded)
6939 bfd_byte *dynbuf = NULL;
6940 unsigned int elfsec;
6941 unsigned long shlink;
6942 bfd_byte *extdyn, *extdynend;
6944 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6948 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6949 || bfd_get_format (abfd) != bfd_object)
6952 s = bfd_get_section_by_name (abfd, ".dynamic");
6953 if (s == NULL || s->size == 0)
6956 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6959 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6960 if (elfsec == SHN_BAD)
6963 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6965 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6966 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
6969 extdynend = extdyn + s->size;
6970 for (; extdyn < extdynend; extdyn += extdynsize)
6972 Elf_Internal_Dyn dyn;
6974 (*swap_dyn_in) (abfd, extdyn, &dyn);
6976 if (dyn.d_tag == DT_NULL)
6979 if (dyn.d_tag == DT_NEEDED)
6982 struct bfd_link_needed_list *l;
6983 unsigned int tagv = dyn.d_un.d_val;
6986 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
6991 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7012 struct elf_symbuf_symbol
7014 unsigned long st_name; /* Symbol name, index in string tbl */
7015 unsigned char st_info; /* Type and binding attributes */
7016 unsigned char st_other; /* Visibilty, and target specific */
7019 struct elf_symbuf_head
7021 struct elf_symbuf_symbol *ssym;
7022 bfd_size_type count;
7023 unsigned int st_shndx;
7030 Elf_Internal_Sym *isym;
7031 struct elf_symbuf_symbol *ssym;
7036 /* Sort references to symbols by ascending section number. */
7039 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7041 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7042 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7044 return s1->st_shndx - s2->st_shndx;
7048 elf_sym_name_compare (const void *arg1, const void *arg2)
7050 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7051 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7052 return strcmp (s1->name, s2->name);
7055 static struct elf_symbuf_head *
7056 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7058 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7059 struct elf_symbuf_symbol *ssym;
7060 struct elf_symbuf_head *ssymbuf, *ssymhead;
7061 bfd_size_type i, shndx_count, total_size;
7063 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7067 for (ind = indbuf, i = 0; i < symcount; i++)
7068 if (isymbuf[i].st_shndx != SHN_UNDEF)
7069 *ind++ = &isymbuf[i];
7072 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7073 elf_sort_elf_symbol);
7076 if (indbufend > indbuf)
7077 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7078 if (ind[0]->st_shndx != ind[1]->st_shndx)
7081 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7082 + (indbufend - indbuf) * sizeof (*ssym));
7083 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7084 if (ssymbuf == NULL)
7090 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7091 ssymbuf->ssym = NULL;
7092 ssymbuf->count = shndx_count;
7093 ssymbuf->st_shndx = 0;
7094 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7096 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7099 ssymhead->ssym = ssym;
7100 ssymhead->count = 0;
7101 ssymhead->st_shndx = (*ind)->st_shndx;
7103 ssym->st_name = (*ind)->st_name;
7104 ssym->st_info = (*ind)->st_info;
7105 ssym->st_other = (*ind)->st_other;
7108 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7109 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7116 /* Check if 2 sections define the same set of local and global
7120 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7121 struct bfd_link_info *info)
7124 const struct elf_backend_data *bed1, *bed2;
7125 Elf_Internal_Shdr *hdr1, *hdr2;
7126 bfd_size_type symcount1, symcount2;
7127 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7128 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7129 Elf_Internal_Sym *isym, *isymend;
7130 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7131 bfd_size_type count1, count2, i;
7132 unsigned int shndx1, shndx2;
7138 /* Both sections have to be in ELF. */
7139 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7140 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7143 if (elf_section_type (sec1) != elf_section_type (sec2))
7146 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7147 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7148 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7151 bed1 = get_elf_backend_data (bfd1);
7152 bed2 = get_elf_backend_data (bfd2);
7153 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7154 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7155 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7156 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7158 if (symcount1 == 0 || symcount2 == 0)
7164 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7165 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7167 if (ssymbuf1 == NULL)
7169 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7171 if (isymbuf1 == NULL)
7174 if (!info->reduce_memory_overheads)
7175 elf_tdata (bfd1)->symbuf = ssymbuf1
7176 = elf_create_symbuf (symcount1, isymbuf1);
7179 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7181 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7183 if (isymbuf2 == NULL)
7186 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7187 elf_tdata (bfd2)->symbuf = ssymbuf2
7188 = elf_create_symbuf (symcount2, isymbuf2);
7191 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7193 /* Optimized faster version. */
7194 bfd_size_type lo, hi, mid;
7195 struct elf_symbol *symp;
7196 struct elf_symbuf_symbol *ssym, *ssymend;
7199 hi = ssymbuf1->count;
7204 mid = (lo + hi) / 2;
7205 if (shndx1 < ssymbuf1[mid].st_shndx)
7207 else if (shndx1 > ssymbuf1[mid].st_shndx)
7211 count1 = ssymbuf1[mid].count;
7218 hi = ssymbuf2->count;
7223 mid = (lo + hi) / 2;
7224 if (shndx2 < ssymbuf2[mid].st_shndx)
7226 else if (shndx2 > ssymbuf2[mid].st_shndx)
7230 count2 = ssymbuf2[mid].count;
7236 if (count1 == 0 || count2 == 0 || count1 != count2)
7239 symtable1 = (struct elf_symbol *)
7240 bfd_malloc (count1 * sizeof (struct elf_symbol));
7241 symtable2 = (struct elf_symbol *)
7242 bfd_malloc (count2 * sizeof (struct elf_symbol));
7243 if (symtable1 == NULL || symtable2 == NULL)
7247 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7248 ssym < ssymend; ssym++, symp++)
7250 symp->u.ssym = ssym;
7251 symp->name = bfd_elf_string_from_elf_section (bfd1,
7257 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7258 ssym < ssymend; ssym++, symp++)
7260 symp->u.ssym = ssym;
7261 symp->name = bfd_elf_string_from_elf_section (bfd2,
7266 /* Sort symbol by name. */
7267 qsort (symtable1, count1, sizeof (struct elf_symbol),
7268 elf_sym_name_compare);
7269 qsort (symtable2, count1, sizeof (struct elf_symbol),
7270 elf_sym_name_compare);
7272 for (i = 0; i < count1; i++)
7273 /* Two symbols must have the same binding, type and name. */
7274 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7275 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7276 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7283 symtable1 = (struct elf_symbol *)
7284 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7285 symtable2 = (struct elf_symbol *)
7286 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7287 if (symtable1 == NULL || symtable2 == NULL)
7290 /* Count definitions in the section. */
7292 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7293 if (isym->st_shndx == shndx1)
7294 symtable1[count1++].u.isym = isym;
7297 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7298 if (isym->st_shndx == shndx2)
7299 symtable2[count2++].u.isym = isym;
7301 if (count1 == 0 || count2 == 0 || count1 != count2)
7304 for (i = 0; i < count1; i++)
7306 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7307 symtable1[i].u.isym->st_name);
7309 for (i = 0; i < count2; i++)
7311 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7312 symtable2[i].u.isym->st_name);
7314 /* Sort symbol by name. */
7315 qsort (symtable1, count1, sizeof (struct elf_symbol),
7316 elf_sym_name_compare);
7317 qsort (symtable2, count1, sizeof (struct elf_symbol),
7318 elf_sym_name_compare);
7320 for (i = 0; i < count1; i++)
7321 /* Two symbols must have the same binding, type and name. */
7322 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7323 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7324 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7342 /* Return TRUE if 2 section types are compatible. */
7345 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7346 bfd *bbfd, const asection *bsec)
7350 || abfd->xvec->flavour != bfd_target_elf_flavour
7351 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7354 return elf_section_type (asec) == elf_section_type (bsec);
7357 /* Final phase of ELF linker. */
7359 /* A structure we use to avoid passing large numbers of arguments. */
7361 struct elf_final_link_info
7363 /* General link information. */
7364 struct bfd_link_info *info;
7367 /* Symbol string table. */
7368 struct bfd_strtab_hash *symstrtab;
7369 /* .dynsym section. */
7370 asection *dynsym_sec;
7371 /* .hash section. */
7373 /* symbol version section (.gnu.version). */
7374 asection *symver_sec;
7375 /* Buffer large enough to hold contents of any section. */
7377 /* Buffer large enough to hold external relocs of any section. */
7378 void *external_relocs;
7379 /* Buffer large enough to hold internal relocs of any section. */
7380 Elf_Internal_Rela *internal_relocs;
7381 /* Buffer large enough to hold external local symbols of any input
7383 bfd_byte *external_syms;
7384 /* And a buffer for symbol section indices. */
7385 Elf_External_Sym_Shndx *locsym_shndx;
7386 /* Buffer large enough to hold internal local symbols of any input
7388 Elf_Internal_Sym *internal_syms;
7389 /* Array large enough to hold a symbol index for each local symbol
7390 of any input BFD. */
7392 /* Array large enough to hold a section pointer for each local
7393 symbol of any input BFD. */
7394 asection **sections;
7395 /* Buffer to hold swapped out symbols. */
7397 /* And one for symbol section indices. */
7398 Elf_External_Sym_Shndx *symshndxbuf;
7399 /* Number of swapped out symbols in buffer. */
7400 size_t symbuf_count;
7401 /* Number of symbols which fit in symbuf. */
7403 /* And same for symshndxbuf. */
7404 size_t shndxbuf_size;
7405 /* Number of STT_FILE syms seen. */
7406 size_t filesym_count;
7409 /* This struct is used to pass information to elf_link_output_extsym. */
7411 struct elf_outext_info
7414 bfd_boolean localsyms;
7415 bfd_boolean need_second_pass;
7416 bfd_boolean second_pass;
7417 struct elf_final_link_info *flinfo;
7421 /* Support for evaluating a complex relocation.
7423 Complex relocations are generalized, self-describing relocations. The
7424 implementation of them consists of two parts: complex symbols, and the
7425 relocations themselves.
7427 The relocations are use a reserved elf-wide relocation type code (R_RELC
7428 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7429 information (start bit, end bit, word width, etc) into the addend. This
7430 information is extracted from CGEN-generated operand tables within gas.
7432 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7433 internal) representing prefix-notation expressions, including but not
7434 limited to those sorts of expressions normally encoded as addends in the
7435 addend field. The symbol mangling format is:
7438 | <unary-operator> ':' <node>
7439 | <binary-operator> ':' <node> ':' <node>
7442 <literal> := 's' <digits=N> ':' <N character symbol name>
7443 | 'S' <digits=N> ':' <N character section name>
7447 <binary-operator> := as in C
7448 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7451 set_symbol_value (bfd *bfd_with_globals,
7452 Elf_Internal_Sym *isymbuf,
7457 struct elf_link_hash_entry **sym_hashes;
7458 struct elf_link_hash_entry *h;
7459 size_t extsymoff = locsymcount;
7461 if (symidx < locsymcount)
7463 Elf_Internal_Sym *sym;
7465 sym = isymbuf + symidx;
7466 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7468 /* It is a local symbol: move it to the
7469 "absolute" section and give it a value. */
7470 sym->st_shndx = SHN_ABS;
7471 sym->st_value = val;
7474 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7478 /* It is a global symbol: set its link type
7479 to "defined" and give it a value. */
7481 sym_hashes = elf_sym_hashes (bfd_with_globals);
7482 h = sym_hashes [symidx - extsymoff];
7483 while (h->root.type == bfd_link_hash_indirect
7484 || h->root.type == bfd_link_hash_warning)
7485 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7486 h->root.type = bfd_link_hash_defined;
7487 h->root.u.def.value = val;
7488 h->root.u.def.section = bfd_abs_section_ptr;
7492 resolve_symbol (const char *name,
7494 struct elf_final_link_info *flinfo,
7496 Elf_Internal_Sym *isymbuf,
7499 Elf_Internal_Sym *sym;
7500 struct bfd_link_hash_entry *global_entry;
7501 const char *candidate = NULL;
7502 Elf_Internal_Shdr *symtab_hdr;
7505 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7507 for (i = 0; i < locsymcount; ++ i)
7511 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7514 candidate = bfd_elf_string_from_elf_section (input_bfd,
7515 symtab_hdr->sh_link,
7518 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7519 name, candidate, (unsigned long) sym->st_value);
7521 if (candidate && strcmp (candidate, name) == 0)
7523 asection *sec = flinfo->sections [i];
7525 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7526 *result += sec->output_offset + sec->output_section->vma;
7528 printf ("Found symbol with value %8.8lx\n",
7529 (unsigned long) *result);
7535 /* Hmm, haven't found it yet. perhaps it is a global. */
7536 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7537 FALSE, FALSE, TRUE);
7541 if (global_entry->type == bfd_link_hash_defined
7542 || global_entry->type == bfd_link_hash_defweak)
7544 *result = (global_entry->u.def.value
7545 + global_entry->u.def.section->output_section->vma
7546 + global_entry->u.def.section->output_offset);
7548 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7549 global_entry->root.string, (unsigned long) *result);
7558 resolve_section (const char *name,
7565 for (curr = sections; curr; curr = curr->next)
7566 if (strcmp (curr->name, name) == 0)
7568 *result = curr->vma;
7572 /* Hmm. still haven't found it. try pseudo-section names. */
7573 for (curr = sections; curr; curr = curr->next)
7575 len = strlen (curr->name);
7576 if (len > strlen (name))
7579 if (strncmp (curr->name, name, len) == 0)
7581 if (strncmp (".end", name + len, 4) == 0)
7583 *result = curr->vma + curr->size;
7587 /* Insert more pseudo-section names here, if you like. */
7595 undefined_reference (const char *reftype, const char *name)
7597 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7602 eval_symbol (bfd_vma *result,
7605 struct elf_final_link_info *flinfo,
7607 Elf_Internal_Sym *isymbuf,
7616 const char *sym = *symp;
7618 bfd_boolean symbol_is_section = FALSE;
7623 if (len < 1 || len > sizeof (symbuf))
7625 bfd_set_error (bfd_error_invalid_operation);
7638 *result = strtoul (sym, (char **) symp, 16);
7642 symbol_is_section = TRUE;
7645 symlen = strtol (sym, (char **) symp, 10);
7646 sym = *symp + 1; /* Skip the trailing ':'. */
7648 if (symend < sym || symlen + 1 > sizeof (symbuf))
7650 bfd_set_error (bfd_error_invalid_operation);
7654 memcpy (symbuf, sym, symlen);
7655 symbuf[symlen] = '\0';
7656 *symp = sym + symlen;
7658 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7659 the symbol as a section, or vice-versa. so we're pretty liberal in our
7660 interpretation here; section means "try section first", not "must be a
7661 section", and likewise with symbol. */
7663 if (symbol_is_section)
7665 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result)
7666 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7667 isymbuf, locsymcount))
7669 undefined_reference ("section", symbuf);
7675 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7676 isymbuf, locsymcount)
7677 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7680 undefined_reference ("symbol", symbuf);
7687 /* All that remains are operators. */
7689 #define UNARY_OP(op) \
7690 if (strncmp (sym, #op, strlen (#op)) == 0) \
7692 sym += strlen (#op); \
7696 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7697 isymbuf, locsymcount, signed_p)) \
7700 *result = op ((bfd_signed_vma) a); \
7706 #define BINARY_OP(op) \
7707 if (strncmp (sym, #op, strlen (#op)) == 0) \
7709 sym += strlen (#op); \
7713 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7714 isymbuf, locsymcount, signed_p)) \
7717 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7718 isymbuf, locsymcount, signed_p)) \
7721 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7751 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7752 bfd_set_error (bfd_error_invalid_operation);
7758 put_value (bfd_vma size,
7759 unsigned long chunksz,
7764 location += (size - chunksz);
7766 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7774 bfd_put_8 (input_bfd, x, location);
7777 bfd_put_16 (input_bfd, x, location);
7780 bfd_put_32 (input_bfd, x, location);
7784 bfd_put_64 (input_bfd, x, location);
7794 get_value (bfd_vma size,
7795 unsigned long chunksz,
7801 for (; size; size -= chunksz, location += chunksz)
7809 x = (x << (8 * chunksz)) | bfd_get_8 (input_bfd, location);
7812 x = (x << (8 * chunksz)) | bfd_get_16 (input_bfd, location);
7815 x = (x << (8 * chunksz)) | bfd_get_32 (input_bfd, location);
7819 x = (x << (8 * chunksz)) | bfd_get_64 (input_bfd, location);
7830 decode_complex_addend (unsigned long *start, /* in bits */
7831 unsigned long *oplen, /* in bits */
7832 unsigned long *len, /* in bits */
7833 unsigned long *wordsz, /* in bytes */
7834 unsigned long *chunksz, /* in bytes */
7835 unsigned long *lsb0_p,
7836 unsigned long *signed_p,
7837 unsigned long *trunc_p,
7838 unsigned long encoded)
7840 * start = encoded & 0x3F;
7841 * len = (encoded >> 6) & 0x3F;
7842 * oplen = (encoded >> 12) & 0x3F;
7843 * wordsz = (encoded >> 18) & 0xF;
7844 * chunksz = (encoded >> 22) & 0xF;
7845 * lsb0_p = (encoded >> 27) & 1;
7846 * signed_p = (encoded >> 28) & 1;
7847 * trunc_p = (encoded >> 29) & 1;
7850 bfd_reloc_status_type
7851 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7852 asection *input_section ATTRIBUTE_UNUSED,
7854 Elf_Internal_Rela *rel,
7857 bfd_vma shift, x, mask;
7858 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7859 bfd_reloc_status_type r;
7861 /* Perform this reloc, since it is complex.
7862 (this is not to say that it necessarily refers to a complex
7863 symbol; merely that it is a self-describing CGEN based reloc.
7864 i.e. the addend has the complete reloc information (bit start, end,
7865 word size, etc) encoded within it.). */
7867 decode_complex_addend (&start, &oplen, &len, &wordsz,
7868 &chunksz, &lsb0_p, &signed_p,
7869 &trunc_p, rel->r_addend);
7871 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7874 shift = (start + 1) - len;
7876 shift = (8 * wordsz) - (start + len);
7878 /* FIXME: octets_per_byte. */
7879 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7882 printf ("Doing complex reloc: "
7883 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7884 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7885 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7886 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7887 oplen, (unsigned long) x, (unsigned long) mask,
7888 (unsigned long) relocation);
7893 /* Now do an overflow check. */
7894 r = bfd_check_overflow ((signed_p
7895 ? complain_overflow_signed
7896 : complain_overflow_unsigned),
7897 len, 0, (8 * wordsz),
7901 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7904 printf (" relocation: %8.8lx\n"
7905 " shifted mask: %8.8lx\n"
7906 " shifted/masked reloc: %8.8lx\n"
7907 " result: %8.8lx\n",
7908 (unsigned long) relocation, (unsigned long) (mask << shift),
7909 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
7911 /* FIXME: octets_per_byte. */
7912 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7916 /* When performing a relocatable link, the input relocations are
7917 preserved. But, if they reference global symbols, the indices
7918 referenced must be updated. Update all the relocations found in
7922 elf_link_adjust_relocs (bfd *abfd,
7923 struct bfd_elf_section_reloc_data *reldata)
7926 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7928 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7929 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7930 bfd_vma r_type_mask;
7932 unsigned int count = reldata->count;
7933 struct elf_link_hash_entry **rel_hash = reldata->hashes;
7935 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
7937 swap_in = bed->s->swap_reloc_in;
7938 swap_out = bed->s->swap_reloc_out;
7940 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
7942 swap_in = bed->s->swap_reloca_in;
7943 swap_out = bed->s->swap_reloca_out;
7948 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
7951 if (bed->s->arch_size == 32)
7958 r_type_mask = 0xffffffff;
7962 erela = reldata->hdr->contents;
7963 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
7965 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
7968 if (*rel_hash == NULL)
7971 BFD_ASSERT ((*rel_hash)->indx >= 0);
7973 (*swap_in) (abfd, erela, irela);
7974 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
7975 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
7976 | (irela[j].r_info & r_type_mask));
7977 (*swap_out) (abfd, irela, erela);
7981 struct elf_link_sort_rela
7987 enum elf_reloc_type_class type;
7988 /* We use this as an array of size int_rels_per_ext_rel. */
7989 Elf_Internal_Rela rela[1];
7993 elf_link_sort_cmp1 (const void *A, const void *B)
7995 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
7996 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
7997 int relativea, relativeb;
7999 relativea = a->type == reloc_class_relative;
8000 relativeb = b->type == reloc_class_relative;
8002 if (relativea < relativeb)
8004 if (relativea > relativeb)
8006 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8008 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8010 if (a->rela->r_offset < b->rela->r_offset)
8012 if (a->rela->r_offset > b->rela->r_offset)
8018 elf_link_sort_cmp2 (const void *A, const void *B)
8020 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8021 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8024 if (a->u.offset < b->u.offset)
8026 if (a->u.offset > b->u.offset)
8028 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
8029 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
8034 if (a->rela->r_offset < b->rela->r_offset)
8036 if (a->rela->r_offset > b->rela->r_offset)
8042 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8044 asection *dynamic_relocs;
8047 bfd_size_type count, size;
8048 size_t i, ret, sort_elt, ext_size;
8049 bfd_byte *sort, *s_non_relative, *p;
8050 struct elf_link_sort_rela *sq;
8051 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8052 int i2e = bed->s->int_rels_per_ext_rel;
8053 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8054 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8055 struct bfd_link_order *lo;
8057 bfd_boolean use_rela;
8059 /* Find a dynamic reloc section. */
8060 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8061 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8062 if (rela_dyn != NULL && rela_dyn->size > 0
8063 && rel_dyn != NULL && rel_dyn->size > 0)
8065 bfd_boolean use_rela_initialised = FALSE;
8067 /* This is just here to stop gcc from complaining.
8068 It's initialization checking code is not perfect. */
8071 /* Both sections are present. Examine the sizes
8072 of the indirect sections to help us choose. */
8073 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8074 if (lo->type == bfd_indirect_link_order)
8076 asection *o = lo->u.indirect.section;
8078 if ((o->size % bed->s->sizeof_rela) == 0)
8080 if ((o->size % bed->s->sizeof_rel) == 0)
8081 /* Section size is divisible by both rel and rela sizes.
8082 It is of no help to us. */
8086 /* Section size is only divisible by rela. */
8087 if (use_rela_initialised && (use_rela == FALSE))
8090 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8091 bfd_set_error (bfd_error_invalid_operation);
8097 use_rela_initialised = TRUE;
8101 else if ((o->size % bed->s->sizeof_rel) == 0)
8103 /* Section size is only divisible by rel. */
8104 if (use_rela_initialised && (use_rela == TRUE))
8107 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8108 bfd_set_error (bfd_error_invalid_operation);
8114 use_rela_initialised = TRUE;
8119 /* The section size is not divisible by either - something is wrong. */
8121 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8122 bfd_set_error (bfd_error_invalid_operation);
8127 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8128 if (lo->type == bfd_indirect_link_order)
8130 asection *o = lo->u.indirect.section;
8132 if ((o->size % bed->s->sizeof_rela) == 0)
8134 if ((o->size % bed->s->sizeof_rel) == 0)
8135 /* Section size is divisible by both rel and rela sizes.
8136 It is of no help to us. */
8140 /* Section size is only divisible by rela. */
8141 if (use_rela_initialised && (use_rela == FALSE))
8144 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8145 bfd_set_error (bfd_error_invalid_operation);
8151 use_rela_initialised = TRUE;
8155 else if ((o->size % bed->s->sizeof_rel) == 0)
8157 /* Section size is only divisible by rel. */
8158 if (use_rela_initialised && (use_rela == TRUE))
8161 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8162 bfd_set_error (bfd_error_invalid_operation);
8168 use_rela_initialised = TRUE;
8173 /* The section size is not divisible by either - something is wrong. */
8175 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8176 bfd_set_error (bfd_error_invalid_operation);
8181 if (! use_rela_initialised)
8185 else if (rela_dyn != NULL && rela_dyn->size > 0)
8187 else if (rel_dyn != NULL && rel_dyn->size > 0)
8194 dynamic_relocs = rela_dyn;
8195 ext_size = bed->s->sizeof_rela;
8196 swap_in = bed->s->swap_reloca_in;
8197 swap_out = bed->s->swap_reloca_out;
8201 dynamic_relocs = rel_dyn;
8202 ext_size = bed->s->sizeof_rel;
8203 swap_in = bed->s->swap_reloc_in;
8204 swap_out = bed->s->swap_reloc_out;
8208 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8209 if (lo->type == bfd_indirect_link_order)
8210 size += lo->u.indirect.section->size;
8212 if (size != dynamic_relocs->size)
8215 sort_elt = (sizeof (struct elf_link_sort_rela)
8216 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8218 count = dynamic_relocs->size / ext_size;
8221 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8225 (*info->callbacks->warning)
8226 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8230 if (bed->s->arch_size == 32)
8231 r_sym_mask = ~(bfd_vma) 0xff;
8233 r_sym_mask = ~(bfd_vma) 0xffffffff;
8235 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8236 if (lo->type == bfd_indirect_link_order)
8238 bfd_byte *erel, *erelend;
8239 asection *o = lo->u.indirect.section;
8241 if (o->contents == NULL && o->size != 0)
8243 /* This is a reloc section that is being handled as a normal
8244 section. See bfd_section_from_shdr. We can't combine
8245 relocs in this case. */
8250 erelend = o->contents + o->size;
8251 /* FIXME: octets_per_byte. */
8252 p = sort + o->output_offset / ext_size * sort_elt;
8254 while (erel < erelend)
8256 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8258 (*swap_in) (abfd, erel, s->rela);
8259 s->type = (*bed->elf_backend_reloc_type_class) (s->rela);
8260 s->u.sym_mask = r_sym_mask;
8266 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8268 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8270 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8271 if (s->type != reloc_class_relative)
8277 sq = (struct elf_link_sort_rela *) s_non_relative;
8278 for (; i < count; i++, p += sort_elt)
8280 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8281 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8283 sp->u.offset = sq->rela->r_offset;
8286 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8288 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8289 if (lo->type == bfd_indirect_link_order)
8291 bfd_byte *erel, *erelend;
8292 asection *o = lo->u.indirect.section;
8295 erelend = o->contents + o->size;
8296 /* FIXME: octets_per_byte. */
8297 p = sort + o->output_offset / ext_size * sort_elt;
8298 while (erel < erelend)
8300 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8301 (*swap_out) (abfd, s->rela, erel);
8308 *psec = dynamic_relocs;
8312 /* Flush the output symbols to the file. */
8315 elf_link_flush_output_syms (struct elf_final_link_info *flinfo,
8316 const struct elf_backend_data *bed)
8318 if (flinfo->symbuf_count > 0)
8320 Elf_Internal_Shdr *hdr;
8324 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8325 pos = hdr->sh_offset + hdr->sh_size;
8326 amt = flinfo->symbuf_count * bed->s->sizeof_sym;
8327 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) != 0
8328 || bfd_bwrite (flinfo->symbuf, amt, flinfo->output_bfd) != amt)
8331 hdr->sh_size += amt;
8332 flinfo->symbuf_count = 0;
8338 /* Add a symbol to the output symbol table. */
8341 elf_link_output_sym (struct elf_final_link_info *flinfo,
8343 Elf_Internal_Sym *elfsym,
8344 asection *input_sec,
8345 struct elf_link_hash_entry *h)
8348 Elf_External_Sym_Shndx *destshndx;
8349 int (*output_symbol_hook)
8350 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8351 struct elf_link_hash_entry *);
8352 const struct elf_backend_data *bed;
8354 bed = get_elf_backend_data (flinfo->output_bfd);
8355 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8356 if (output_symbol_hook != NULL)
8358 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8363 if (name == NULL || *name == '\0')
8364 elfsym->st_name = 0;
8365 else if (input_sec->flags & SEC_EXCLUDE)
8366 elfsym->st_name = 0;
8369 elfsym->st_name = (unsigned long) _bfd_stringtab_add (flinfo->symstrtab,
8371 if (elfsym->st_name == (unsigned long) -1)
8375 if (flinfo->symbuf_count >= flinfo->symbuf_size)
8377 if (! elf_link_flush_output_syms (flinfo, bed))
8381 dest = flinfo->symbuf + flinfo->symbuf_count * bed->s->sizeof_sym;
8382 destshndx = flinfo->symshndxbuf;
8383 if (destshndx != NULL)
8385 if (bfd_get_symcount (flinfo->output_bfd) >= flinfo->shndxbuf_size)
8389 amt = flinfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8390 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8392 if (destshndx == NULL)
8394 flinfo->symshndxbuf = destshndx;
8395 memset ((char *) destshndx + amt, 0, amt);
8396 flinfo->shndxbuf_size *= 2;
8398 destshndx += bfd_get_symcount (flinfo->output_bfd);
8401 bed->s->swap_symbol_out (flinfo->output_bfd, elfsym, dest, destshndx);
8402 flinfo->symbuf_count += 1;
8403 bfd_get_symcount (flinfo->output_bfd) += 1;
8408 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8411 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8413 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8414 && sym->st_shndx < SHN_LORESERVE)
8416 /* The gABI doesn't support dynamic symbols in output sections
8418 (*_bfd_error_handler)
8419 (_("%B: Too many sections: %d (>= %d)"),
8420 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8421 bfd_set_error (bfd_error_nonrepresentable_section);
8427 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8428 allowing an unsatisfied unversioned symbol in the DSO to match a
8429 versioned symbol that would normally require an explicit version.
8430 We also handle the case that a DSO references a hidden symbol
8431 which may be satisfied by a versioned symbol in another DSO. */
8434 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8435 const struct elf_backend_data *bed,
8436 struct elf_link_hash_entry *h)
8439 struct elf_link_loaded_list *loaded;
8441 if (!is_elf_hash_table (info->hash))
8444 switch (h->root.type)
8450 case bfd_link_hash_undefined:
8451 case bfd_link_hash_undefweak:
8452 abfd = h->root.u.undef.abfd;
8453 if ((abfd->flags & DYNAMIC) == 0
8454 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8458 case bfd_link_hash_defined:
8459 case bfd_link_hash_defweak:
8460 abfd = h->root.u.def.section->owner;
8463 case bfd_link_hash_common:
8464 abfd = h->root.u.c.p->section->owner;
8467 BFD_ASSERT (abfd != NULL);
8469 for (loaded = elf_hash_table (info)->loaded;
8471 loaded = loaded->next)
8474 Elf_Internal_Shdr *hdr;
8475 bfd_size_type symcount;
8476 bfd_size_type extsymcount;
8477 bfd_size_type extsymoff;
8478 Elf_Internal_Shdr *versymhdr;
8479 Elf_Internal_Sym *isym;
8480 Elf_Internal_Sym *isymend;
8481 Elf_Internal_Sym *isymbuf;
8482 Elf_External_Versym *ever;
8483 Elf_External_Versym *extversym;
8485 input = loaded->abfd;
8487 /* We check each DSO for a possible hidden versioned definition. */
8489 || (input->flags & DYNAMIC) == 0
8490 || elf_dynversym (input) == 0)
8493 hdr = &elf_tdata (input)->dynsymtab_hdr;
8495 symcount = hdr->sh_size / bed->s->sizeof_sym;
8496 if (elf_bad_symtab (input))
8498 extsymcount = symcount;
8503 extsymcount = symcount - hdr->sh_info;
8504 extsymoff = hdr->sh_info;
8507 if (extsymcount == 0)
8510 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8512 if (isymbuf == NULL)
8515 /* Read in any version definitions. */
8516 versymhdr = &elf_tdata (input)->dynversym_hdr;
8517 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8518 if (extversym == NULL)
8521 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8522 || (bfd_bread (extversym, versymhdr->sh_size, input)
8523 != versymhdr->sh_size))
8531 ever = extversym + extsymoff;
8532 isymend = isymbuf + extsymcount;
8533 for (isym = isymbuf; isym < isymend; isym++, ever++)
8536 Elf_Internal_Versym iver;
8537 unsigned short version_index;
8539 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8540 || isym->st_shndx == SHN_UNDEF)
8543 name = bfd_elf_string_from_elf_section (input,
8546 if (strcmp (name, h->root.root.string) != 0)
8549 _bfd_elf_swap_versym_in (input, ever, &iver);
8551 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8553 && h->forced_local))
8555 /* If we have a non-hidden versioned sym, then it should
8556 have provided a definition for the undefined sym unless
8557 it is defined in a non-shared object and forced local.
8562 version_index = iver.vs_vers & VERSYM_VERSION;
8563 if (version_index == 1 || version_index == 2)
8565 /* This is the base or first version. We can use it. */
8579 /* Add an external symbol to the symbol table. This is called from
8580 the hash table traversal routine. When generating a shared object,
8581 we go through the symbol table twice. The first time we output
8582 anything that might have been forced to local scope in a version
8583 script. The second time we output the symbols that are still
8587 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
8589 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
8590 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8591 struct elf_final_link_info *flinfo = eoinfo->flinfo;
8593 Elf_Internal_Sym sym;
8594 asection *input_sec;
8595 const struct elf_backend_data *bed;
8599 if (h->root.type == bfd_link_hash_warning)
8601 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8602 if (h->root.type == bfd_link_hash_new)
8606 /* Decide whether to output this symbol in this pass. */
8607 if (eoinfo->localsyms)
8609 if (!h->forced_local)
8611 if (eoinfo->second_pass
8612 && !((h->root.type == bfd_link_hash_defined
8613 || h->root.type == bfd_link_hash_defweak)
8614 && h->root.u.def.section->output_section != NULL))
8619 if (h->forced_local)
8623 bed = get_elf_backend_data (flinfo->output_bfd);
8625 if (h->root.type == bfd_link_hash_undefined)
8627 /* If we have an undefined symbol reference here then it must have
8628 come from a shared library that is being linked in. (Undefined
8629 references in regular files have already been handled unless
8630 they are in unreferenced sections which are removed by garbage
8632 bfd_boolean ignore_undef = FALSE;
8634 /* Some symbols may be special in that the fact that they're
8635 undefined can be safely ignored - let backend determine that. */
8636 if (bed->elf_backend_ignore_undef_symbol)
8637 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8639 /* If we are reporting errors for this situation then do so now. */
8642 && (!h->ref_regular || flinfo->info->gc_sections)
8643 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
8644 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8646 if (!(flinfo->info->callbacks->undefined_symbol
8647 (flinfo->info, h->root.root.string,
8648 h->ref_regular ? NULL : h->root.u.undef.abfd,
8650 (flinfo->info->unresolved_syms_in_shared_libs
8651 == RM_GENERATE_ERROR))))
8653 bfd_set_error (bfd_error_bad_value);
8654 eoinfo->failed = TRUE;
8660 /* We should also warn if a forced local symbol is referenced from
8661 shared libraries. */
8662 if (!flinfo->info->relocatable
8663 && flinfo->info->executable
8669 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
8674 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
8675 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
8676 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
8677 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
8679 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
8680 def_bfd = flinfo->output_bfd;
8681 if (h->root.u.def.section != bfd_abs_section_ptr)
8682 def_bfd = h->root.u.def.section->owner;
8683 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
8684 h->root.root.string);
8685 bfd_set_error (bfd_error_bad_value);
8686 eoinfo->failed = TRUE;
8690 /* We don't want to output symbols that have never been mentioned by
8691 a regular file, or that we have been told to strip. However, if
8692 h->indx is set to -2, the symbol is used by a reloc and we must
8696 else if ((h->def_dynamic
8698 || h->root.type == bfd_link_hash_new)
8702 else if (flinfo->info->strip == strip_all)
8704 else if (flinfo->info->strip == strip_some
8705 && bfd_hash_lookup (flinfo->info->keep_hash,
8706 h->root.root.string, FALSE, FALSE) == NULL)
8708 else if ((h->root.type == bfd_link_hash_defined
8709 || h->root.type == bfd_link_hash_defweak)
8710 && ((flinfo->info->strip_discarded
8711 && discarded_section (h->root.u.def.section))
8712 || (h->root.u.def.section->owner != NULL
8713 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
8715 else if ((h->root.type == bfd_link_hash_undefined
8716 || h->root.type == bfd_link_hash_undefweak)
8717 && h->root.u.undef.abfd != NULL
8718 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
8723 /* If we're stripping it, and it's not a dynamic symbol, there's
8724 nothing else to do unless it is a forced local symbol or a
8725 STT_GNU_IFUNC symbol. */
8728 && h->type != STT_GNU_IFUNC
8729 && !h->forced_local)
8733 sym.st_size = h->size;
8734 sym.st_other = h->other;
8735 if (h->forced_local)
8737 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8738 /* Turn off visibility on local symbol. */
8739 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8741 else if (h->unique_global)
8742 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8743 else if (h->root.type == bfd_link_hash_undefweak
8744 || h->root.type == bfd_link_hash_defweak)
8745 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8747 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8748 sym.st_target_internal = h->target_internal;
8750 switch (h->root.type)
8753 case bfd_link_hash_new:
8754 case bfd_link_hash_warning:
8758 case bfd_link_hash_undefined:
8759 case bfd_link_hash_undefweak:
8760 input_sec = bfd_und_section_ptr;
8761 sym.st_shndx = SHN_UNDEF;
8764 case bfd_link_hash_defined:
8765 case bfd_link_hash_defweak:
8767 input_sec = h->root.u.def.section;
8768 if (input_sec->output_section != NULL)
8770 if (eoinfo->localsyms && flinfo->filesym_count == 1)
8772 bfd_boolean second_pass_sym
8773 = (input_sec->owner == flinfo->output_bfd
8774 || input_sec->owner == NULL
8775 || (input_sec->flags & SEC_LINKER_CREATED) != 0
8776 || (input_sec->owner->flags & BFD_LINKER_CREATED) != 0);
8778 eoinfo->need_second_pass |= second_pass_sym;
8779 if (eoinfo->second_pass != second_pass_sym)
8784 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
8785 input_sec->output_section);
8786 if (sym.st_shndx == SHN_BAD)
8788 (*_bfd_error_handler)
8789 (_("%B: could not find output section %A for input section %A"),
8790 flinfo->output_bfd, input_sec->output_section, input_sec);
8791 bfd_set_error (bfd_error_nonrepresentable_section);
8792 eoinfo->failed = TRUE;
8796 /* ELF symbols in relocatable files are section relative,
8797 but in nonrelocatable files they are virtual
8799 sym.st_value = h->root.u.def.value + input_sec->output_offset;
8800 if (!flinfo->info->relocatable)
8802 sym.st_value += input_sec->output_section->vma;
8803 if (h->type == STT_TLS)
8805 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
8806 if (tls_sec != NULL)
8807 sym.st_value -= tls_sec->vma;
8810 /* The TLS section may have been garbage collected. */
8811 BFD_ASSERT (flinfo->info->gc_sections
8812 && !input_sec->gc_mark);
8819 BFD_ASSERT (input_sec->owner == NULL
8820 || (input_sec->owner->flags & DYNAMIC) != 0);
8821 sym.st_shndx = SHN_UNDEF;
8822 input_sec = bfd_und_section_ptr;
8827 case bfd_link_hash_common:
8828 input_sec = h->root.u.c.p->section;
8829 sym.st_shndx = bed->common_section_index (input_sec);
8830 sym.st_value = 1 << h->root.u.c.p->alignment_power;
8833 case bfd_link_hash_indirect:
8834 /* These symbols are created by symbol versioning. They point
8835 to the decorated version of the name. For example, if the
8836 symbol foo@@GNU_1.2 is the default, which should be used when
8837 foo is used with no version, then we add an indirect symbol
8838 foo which points to foo@@GNU_1.2. We ignore these symbols,
8839 since the indirected symbol is already in the hash table. */
8843 /* Give the processor backend a chance to tweak the symbol value,
8844 and also to finish up anything that needs to be done for this
8845 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8846 forced local syms when non-shared is due to a historical quirk.
8847 STT_GNU_IFUNC symbol must go through PLT. */
8848 if ((h->type == STT_GNU_IFUNC
8850 && !flinfo->info->relocatable)
8851 || ((h->dynindx != -1
8853 && ((flinfo->info->shared
8854 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
8855 || h->root.type != bfd_link_hash_undefweak))
8856 || !h->forced_local)
8857 && elf_hash_table (flinfo->info)->dynamic_sections_created))
8859 if (! ((*bed->elf_backend_finish_dynamic_symbol)
8860 (flinfo->output_bfd, flinfo->info, h, &sym)))
8862 eoinfo->failed = TRUE;
8867 /* If we are marking the symbol as undefined, and there are no
8868 non-weak references to this symbol from a regular object, then
8869 mark the symbol as weak undefined; if there are non-weak
8870 references, mark the symbol as strong. We can't do this earlier,
8871 because it might not be marked as undefined until the
8872 finish_dynamic_symbol routine gets through with it. */
8873 if (sym.st_shndx == SHN_UNDEF
8875 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
8876 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
8879 unsigned int type = ELF_ST_TYPE (sym.st_info);
8881 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8882 if (type == STT_GNU_IFUNC)
8885 if (h->ref_regular_nonweak)
8886 bindtype = STB_GLOBAL;
8888 bindtype = STB_WEAK;
8889 sym.st_info = ELF_ST_INFO (bindtype, type);
8892 /* If this is a symbol defined in a dynamic library, don't use the
8893 symbol size from the dynamic library. Relinking an executable
8894 against a new library may introduce gratuitous changes in the
8895 executable's symbols if we keep the size. */
8896 if (sym.st_shndx == SHN_UNDEF
8901 /* If a non-weak symbol with non-default visibility is not defined
8902 locally, it is a fatal error. */
8903 if (!flinfo->info->relocatable
8904 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
8905 && ELF_ST_BIND (sym.st_info) != STB_WEAK
8906 && h->root.type == bfd_link_hash_undefined
8911 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
8912 msg = _("%B: protected symbol `%s' isn't defined");
8913 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
8914 msg = _("%B: internal symbol `%s' isn't defined");
8916 msg = _("%B: hidden symbol `%s' isn't defined");
8917 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
8918 bfd_set_error (bfd_error_bad_value);
8919 eoinfo->failed = TRUE;
8923 /* If this symbol should be put in the .dynsym section, then put it
8924 there now. We already know the symbol index. We also fill in
8925 the entry in the .hash section. */
8926 if (flinfo->dynsym_sec != NULL
8928 && elf_hash_table (flinfo->info)->dynamic_sections_created)
8932 sym.st_name = h->dynstr_index;
8933 esym = flinfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
8934 if (!check_dynsym (flinfo->output_bfd, &sym))
8936 eoinfo->failed = TRUE;
8939 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
8941 if (flinfo->hash_sec != NULL)
8943 size_t hash_entry_size;
8944 bfd_byte *bucketpos;
8949 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
8950 bucket = h->u.elf_hash_value % bucketcount;
8953 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
8954 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
8955 + (bucket + 2) * hash_entry_size);
8956 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
8957 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
8959 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
8960 ((bfd_byte *) flinfo->hash_sec->contents
8961 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
8964 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
8966 Elf_Internal_Versym iversym;
8967 Elf_External_Versym *eversym;
8969 if (!h->def_regular)
8971 if (h->verinfo.verdef == NULL)
8972 iversym.vs_vers = 0;
8974 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
8978 if (h->verinfo.vertree == NULL)
8979 iversym.vs_vers = 1;
8981 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
8982 if (flinfo->info->create_default_symver)
8987 iversym.vs_vers |= VERSYM_HIDDEN;
8989 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
8990 eversym += h->dynindx;
8991 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
8995 /* If we're stripping it, then it was just a dynamic symbol, and
8996 there's nothing else to do. */
8997 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
9000 indx = bfd_get_symcount (flinfo->output_bfd);
9001 ret = elf_link_output_sym (flinfo, h->root.root.string, &sym, input_sec, h);
9004 eoinfo->failed = TRUE;
9009 else if (h->indx == -2)
9015 /* Return TRUE if special handling is done for relocs in SEC against
9016 symbols defined in discarded sections. */
9019 elf_section_ignore_discarded_relocs (asection *sec)
9021 const struct elf_backend_data *bed;
9023 switch (sec->sec_info_type)
9025 case SEC_INFO_TYPE_STABS:
9026 case SEC_INFO_TYPE_EH_FRAME:
9032 bed = get_elf_backend_data (sec->owner);
9033 if (bed->elf_backend_ignore_discarded_relocs != NULL
9034 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9040 /* Return a mask saying how ld should treat relocations in SEC against
9041 symbols defined in discarded sections. If this function returns
9042 COMPLAIN set, ld will issue a warning message. If this function
9043 returns PRETEND set, and the discarded section was link-once and the
9044 same size as the kept link-once section, ld will pretend that the
9045 symbol was actually defined in the kept section. Otherwise ld will
9046 zero the reloc (at least that is the intent, but some cooperation by
9047 the target dependent code is needed, particularly for REL targets). */
9050 _bfd_elf_default_action_discarded (asection *sec)
9052 if (sec->flags & SEC_DEBUGGING)
9055 if (strcmp (".eh_frame", sec->name) == 0)
9058 if (strcmp (".gcc_except_table", sec->name) == 0)
9061 return COMPLAIN | PRETEND;
9064 /* Find a match between a section and a member of a section group. */
9067 match_group_member (asection *sec, asection *group,
9068 struct bfd_link_info *info)
9070 asection *first = elf_next_in_group (group);
9071 asection *s = first;
9075 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9078 s = elf_next_in_group (s);
9086 /* Check if the kept section of a discarded section SEC can be used
9087 to replace it. Return the replacement if it is OK. Otherwise return
9091 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9095 kept = sec->kept_section;
9098 if ((kept->flags & SEC_GROUP) != 0)
9099 kept = match_group_member (sec, kept, info);
9101 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9102 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9104 sec->kept_section = kept;
9109 /* Link an input file into the linker output file. This function
9110 handles all the sections and relocations of the input file at once.
9111 This is so that we only have to read the local symbols once, and
9112 don't have to keep them in memory. */
9115 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9117 int (*relocate_section)
9118 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9119 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9121 Elf_Internal_Shdr *symtab_hdr;
9124 Elf_Internal_Sym *isymbuf;
9125 Elf_Internal_Sym *isym;
9126 Elf_Internal_Sym *isymend;
9128 asection **ppsection;
9130 const struct elf_backend_data *bed;
9131 struct elf_link_hash_entry **sym_hashes;
9132 bfd_size_type address_size;
9133 bfd_vma r_type_mask;
9135 bfd_boolean have_file_sym = FALSE;
9137 output_bfd = flinfo->output_bfd;
9138 bed = get_elf_backend_data (output_bfd);
9139 relocate_section = bed->elf_backend_relocate_section;
9141 /* If this is a dynamic object, we don't want to do anything here:
9142 we don't want the local symbols, and we don't want the section
9144 if ((input_bfd->flags & DYNAMIC) != 0)
9147 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9148 if (elf_bad_symtab (input_bfd))
9150 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9155 locsymcount = symtab_hdr->sh_info;
9156 extsymoff = symtab_hdr->sh_info;
9159 /* Read the local symbols. */
9160 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9161 if (isymbuf == NULL && locsymcount != 0)
9163 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9164 flinfo->internal_syms,
9165 flinfo->external_syms,
9166 flinfo->locsym_shndx);
9167 if (isymbuf == NULL)
9171 /* Find local symbol sections and adjust values of symbols in
9172 SEC_MERGE sections. Write out those local symbols we know are
9173 going into the output file. */
9174 isymend = isymbuf + locsymcount;
9175 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9177 isym++, pindex++, ppsection++)
9181 Elf_Internal_Sym osym;
9187 if (elf_bad_symtab (input_bfd))
9189 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9196 if (isym->st_shndx == SHN_UNDEF)
9197 isec = bfd_und_section_ptr;
9198 else if (isym->st_shndx == SHN_ABS)
9199 isec = bfd_abs_section_ptr;
9200 else if (isym->st_shndx == SHN_COMMON)
9201 isec = bfd_com_section_ptr;
9204 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9207 /* Don't attempt to output symbols with st_shnx in the
9208 reserved range other than SHN_ABS and SHN_COMMON. */
9212 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9213 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9215 _bfd_merged_section_offset (output_bfd, &isec,
9216 elf_section_data (isec)->sec_info,
9222 /* Don't output the first, undefined, symbol. */
9223 if (ppsection == flinfo->sections)
9226 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9228 /* We never output section symbols. Instead, we use the
9229 section symbol of the corresponding section in the output
9234 /* If we are stripping all symbols, we don't want to output this
9236 if (flinfo->info->strip == strip_all)
9239 /* If we are discarding all local symbols, we don't want to
9240 output this one. If we are generating a relocatable output
9241 file, then some of the local symbols may be required by
9242 relocs; we output them below as we discover that they are
9244 if (flinfo->info->discard == discard_all)
9247 /* If this symbol is defined in a section which we are
9248 discarding, we don't need to keep it. */
9249 if (isym->st_shndx != SHN_UNDEF
9250 && isym->st_shndx < SHN_LORESERVE
9251 && bfd_section_removed_from_list (output_bfd,
9252 isec->output_section))
9255 /* Get the name of the symbol. */
9256 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9261 /* See if we are discarding symbols with this name. */
9262 if ((flinfo->info->strip == strip_some
9263 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9265 || (((flinfo->info->discard == discard_sec_merge
9266 && (isec->flags & SEC_MERGE) && !flinfo->info->relocatable)
9267 || flinfo->info->discard == discard_l)
9268 && bfd_is_local_label_name (input_bfd, name)))
9271 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9273 have_file_sym = TRUE;
9274 flinfo->filesym_count += 1;
9278 /* In the absence of debug info, bfd_find_nearest_line uses
9279 FILE symbols to determine the source file for local
9280 function symbols. Provide a FILE symbol here if input
9281 files lack such, so that their symbols won't be
9282 associated with a previous input file. It's not the
9283 source file, but the best we can do. */
9284 have_file_sym = TRUE;
9285 flinfo->filesym_count += 1;
9286 memset (&osym, 0, sizeof (osym));
9287 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9288 osym.st_shndx = SHN_ABS;
9289 if (!elf_link_output_sym (flinfo, input_bfd->filename, &osym,
9290 bfd_abs_section_ptr, NULL))
9296 /* Adjust the section index for the output file. */
9297 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9298 isec->output_section);
9299 if (osym.st_shndx == SHN_BAD)
9302 /* ELF symbols in relocatable files are section relative, but
9303 in executable files they are virtual addresses. Note that
9304 this code assumes that all ELF sections have an associated
9305 BFD section with a reasonable value for output_offset; below
9306 we assume that they also have a reasonable value for
9307 output_section. Any special sections must be set up to meet
9308 these requirements. */
9309 osym.st_value += isec->output_offset;
9310 if (!flinfo->info->relocatable)
9312 osym.st_value += isec->output_section->vma;
9313 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9315 /* STT_TLS symbols are relative to PT_TLS segment base. */
9316 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9317 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9321 indx = bfd_get_symcount (output_bfd);
9322 ret = elf_link_output_sym (flinfo, name, &osym, isec, NULL);
9329 if (bed->s->arch_size == 32)
9337 r_type_mask = 0xffffffff;
9342 /* Relocate the contents of each section. */
9343 sym_hashes = elf_sym_hashes (input_bfd);
9344 for (o = input_bfd->sections; o != NULL; o = o->next)
9348 if (! o->linker_mark)
9350 /* This section was omitted from the link. */
9354 if (flinfo->info->relocatable
9355 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9357 /* Deal with the group signature symbol. */
9358 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9359 unsigned long symndx = sec_data->this_hdr.sh_info;
9360 asection *osec = o->output_section;
9362 if (symndx >= locsymcount
9363 || (elf_bad_symtab (input_bfd)
9364 && flinfo->sections[symndx] == NULL))
9366 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9367 while (h->root.type == bfd_link_hash_indirect
9368 || h->root.type == bfd_link_hash_warning)
9369 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9370 /* Arrange for symbol to be output. */
9372 elf_section_data (osec)->this_hdr.sh_info = -2;
9374 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9376 /* We'll use the output section target_index. */
9377 asection *sec = flinfo->sections[symndx]->output_section;
9378 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9382 if (flinfo->indices[symndx] == -1)
9384 /* Otherwise output the local symbol now. */
9385 Elf_Internal_Sym sym = isymbuf[symndx];
9386 asection *sec = flinfo->sections[symndx]->output_section;
9391 name = bfd_elf_string_from_elf_section (input_bfd,
9392 symtab_hdr->sh_link,
9397 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9399 if (sym.st_shndx == SHN_BAD)
9402 sym.st_value += o->output_offset;
9404 indx = bfd_get_symcount (output_bfd);
9405 ret = elf_link_output_sym (flinfo, name, &sym, o, NULL);
9409 flinfo->indices[symndx] = indx;
9413 elf_section_data (osec)->this_hdr.sh_info
9414 = flinfo->indices[symndx];
9418 if ((o->flags & SEC_HAS_CONTENTS) == 0
9419 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9422 if ((o->flags & SEC_LINKER_CREATED) != 0)
9424 /* Section was created by _bfd_elf_link_create_dynamic_sections
9429 /* Get the contents of the section. They have been cached by a
9430 relaxation routine. Note that o is a section in an input
9431 file, so the contents field will not have been set by any of
9432 the routines which work on output files. */
9433 if (elf_section_data (o)->this_hdr.contents != NULL)
9434 contents = elf_section_data (o)->this_hdr.contents;
9437 contents = flinfo->contents;
9438 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9442 if ((o->flags & SEC_RELOC) != 0)
9444 Elf_Internal_Rela *internal_relocs;
9445 Elf_Internal_Rela *rel, *relend;
9446 int action_discarded;
9449 /* Get the swapped relocs. */
9451 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
9452 flinfo->internal_relocs, FALSE);
9453 if (internal_relocs == NULL
9454 && o->reloc_count > 0)
9457 /* We need to reverse-copy input .ctors/.dtors sections if
9458 they are placed in .init_array/.finit_array for output. */
9459 if (o->size > address_size
9460 && ((strncmp (o->name, ".ctors", 6) == 0
9461 && strcmp (o->output_section->name,
9462 ".init_array") == 0)
9463 || (strncmp (o->name, ".dtors", 6) == 0
9464 && strcmp (o->output_section->name,
9465 ".fini_array") == 0))
9466 && (o->name[6] == 0 || o->name[6] == '.'))
9468 if (o->size != o->reloc_count * address_size)
9470 (*_bfd_error_handler)
9471 (_("error: %B: size of section %A is not "
9472 "multiple of address size"),
9474 bfd_set_error (bfd_error_on_input);
9477 o->flags |= SEC_ELF_REVERSE_COPY;
9480 action_discarded = -1;
9481 if (!elf_section_ignore_discarded_relocs (o))
9482 action_discarded = (*bed->action_discarded) (o);
9484 /* Run through the relocs evaluating complex reloc symbols and
9485 looking for relocs against symbols from discarded sections
9486 or section symbols from removed link-once sections.
9487 Complain about relocs against discarded sections. Zero
9488 relocs against removed link-once sections. */
9490 rel = internal_relocs;
9491 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9492 for ( ; rel < relend; rel++)
9494 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9495 unsigned int s_type;
9496 asection **ps, *sec;
9497 struct elf_link_hash_entry *h = NULL;
9498 const char *sym_name;
9500 if (r_symndx == STN_UNDEF)
9503 if (r_symndx >= locsymcount
9504 || (elf_bad_symtab (input_bfd)
9505 && flinfo->sections[r_symndx] == NULL))
9507 h = sym_hashes[r_symndx - extsymoff];
9509 /* Badly formatted input files can contain relocs that
9510 reference non-existant symbols. Check here so that
9511 we do not seg fault. */
9516 sprintf_vma (buffer, rel->r_info);
9517 (*_bfd_error_handler)
9518 (_("error: %B contains a reloc (0x%s) for section %A "
9519 "that references a non-existent global symbol"),
9520 input_bfd, o, buffer);
9521 bfd_set_error (bfd_error_bad_value);
9525 while (h->root.type == bfd_link_hash_indirect
9526 || h->root.type == bfd_link_hash_warning)
9527 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9532 if (h->root.type == bfd_link_hash_defined
9533 || h->root.type == bfd_link_hash_defweak)
9534 ps = &h->root.u.def.section;
9536 sym_name = h->root.root.string;
9540 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9542 s_type = ELF_ST_TYPE (sym->st_info);
9543 ps = &flinfo->sections[r_symndx];
9544 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9548 if ((s_type == STT_RELC || s_type == STT_SRELC)
9549 && !flinfo->info->relocatable)
9552 bfd_vma dot = (rel->r_offset
9553 + o->output_offset + o->output_section->vma);
9555 printf ("Encountered a complex symbol!");
9556 printf (" (input_bfd %s, section %s, reloc %ld\n",
9557 input_bfd->filename, o->name,
9558 (long) (rel - internal_relocs));
9559 printf (" symbol: idx %8.8lx, name %s\n",
9560 r_symndx, sym_name);
9561 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9562 (unsigned long) rel->r_info,
9563 (unsigned long) rel->r_offset);
9565 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
9566 isymbuf, locsymcount, s_type == STT_SRELC))
9569 /* Symbol evaluated OK. Update to absolute value. */
9570 set_symbol_value (input_bfd, isymbuf, locsymcount,
9575 if (action_discarded != -1 && ps != NULL)
9577 /* Complain if the definition comes from a
9578 discarded section. */
9579 if ((sec = *ps) != NULL && discarded_section (sec))
9581 BFD_ASSERT (r_symndx != STN_UNDEF);
9582 if (action_discarded & COMPLAIN)
9583 (*flinfo->info->callbacks->einfo)
9584 (_("%X`%s' referenced in section `%A' of %B: "
9585 "defined in discarded section `%A' of %B\n"),
9586 sym_name, o, input_bfd, sec, sec->owner);
9588 /* Try to do the best we can to support buggy old
9589 versions of gcc. Pretend that the symbol is
9590 really defined in the kept linkonce section.
9591 FIXME: This is quite broken. Modifying the
9592 symbol here means we will be changing all later
9593 uses of the symbol, not just in this section. */
9594 if (action_discarded & PRETEND)
9598 kept = _bfd_elf_check_kept_section (sec,
9610 /* Relocate the section by invoking a back end routine.
9612 The back end routine is responsible for adjusting the
9613 section contents as necessary, and (if using Rela relocs
9614 and generating a relocatable output file) adjusting the
9615 reloc addend as necessary.
9617 The back end routine does not have to worry about setting
9618 the reloc address or the reloc symbol index.
9620 The back end routine is given a pointer to the swapped in
9621 internal symbols, and can access the hash table entries
9622 for the external symbols via elf_sym_hashes (input_bfd).
9624 When generating relocatable output, the back end routine
9625 must handle STB_LOCAL/STT_SECTION symbols specially. The
9626 output symbol is going to be a section symbol
9627 corresponding to the output section, which will require
9628 the addend to be adjusted. */
9630 ret = (*relocate_section) (output_bfd, flinfo->info,
9631 input_bfd, o, contents,
9639 || flinfo->info->relocatable
9640 || flinfo->info->emitrelocations)
9642 Elf_Internal_Rela *irela;
9643 Elf_Internal_Rela *irelaend, *irelamid;
9644 bfd_vma last_offset;
9645 struct elf_link_hash_entry **rel_hash;
9646 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
9647 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
9648 unsigned int next_erel;
9649 bfd_boolean rela_normal;
9650 struct bfd_elf_section_data *esdi, *esdo;
9652 esdi = elf_section_data (o);
9653 esdo = elf_section_data (o->output_section);
9654 rela_normal = FALSE;
9656 /* Adjust the reloc addresses and symbol indices. */
9658 irela = internal_relocs;
9659 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9660 rel_hash = esdo->rel.hashes + esdo->rel.count;
9661 /* We start processing the REL relocs, if any. When we reach
9662 IRELAMID in the loop, we switch to the RELA relocs. */
9664 if (esdi->rel.hdr != NULL)
9665 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
9666 * bed->s->int_rels_per_ext_rel);
9667 rel_hash_list = rel_hash;
9668 rela_hash_list = NULL;
9669 last_offset = o->output_offset;
9670 if (!flinfo->info->relocatable)
9671 last_offset += o->output_section->vma;
9672 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9674 unsigned long r_symndx;
9676 Elf_Internal_Sym sym;
9678 if (next_erel == bed->s->int_rels_per_ext_rel)
9684 if (irela == irelamid)
9686 rel_hash = esdo->rela.hashes + esdo->rela.count;
9687 rela_hash_list = rel_hash;
9688 rela_normal = bed->rela_normal;
9691 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9694 if (irela->r_offset >= (bfd_vma) -2)
9696 /* This is a reloc for a deleted entry or somesuch.
9697 Turn it into an R_*_NONE reloc, at the same
9698 offset as the last reloc. elf_eh_frame.c and
9699 bfd_elf_discard_info rely on reloc offsets
9701 irela->r_offset = last_offset;
9703 irela->r_addend = 0;
9707 irela->r_offset += o->output_offset;
9709 /* Relocs in an executable have to be virtual addresses. */
9710 if (!flinfo->info->relocatable)
9711 irela->r_offset += o->output_section->vma;
9713 last_offset = irela->r_offset;
9715 r_symndx = irela->r_info >> r_sym_shift;
9716 if (r_symndx == STN_UNDEF)
9719 if (r_symndx >= locsymcount
9720 || (elf_bad_symtab (input_bfd)
9721 && flinfo->sections[r_symndx] == NULL))
9723 struct elf_link_hash_entry *rh;
9726 /* This is a reloc against a global symbol. We
9727 have not yet output all the local symbols, so
9728 we do not know the symbol index of any global
9729 symbol. We set the rel_hash entry for this
9730 reloc to point to the global hash table entry
9731 for this symbol. The symbol index is then
9732 set at the end of bfd_elf_final_link. */
9733 indx = r_symndx - extsymoff;
9734 rh = elf_sym_hashes (input_bfd)[indx];
9735 while (rh->root.type == bfd_link_hash_indirect
9736 || rh->root.type == bfd_link_hash_warning)
9737 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
9739 /* Setting the index to -2 tells
9740 elf_link_output_extsym that this symbol is
9742 BFD_ASSERT (rh->indx < 0);
9750 /* This is a reloc against a local symbol. */
9753 sym = isymbuf[r_symndx];
9754 sec = flinfo->sections[r_symndx];
9755 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
9757 /* I suppose the backend ought to fill in the
9758 section of any STT_SECTION symbol against a
9759 processor specific section. */
9760 r_symndx = STN_UNDEF;
9761 if (bfd_is_abs_section (sec))
9763 else if (sec == NULL || sec->owner == NULL)
9765 bfd_set_error (bfd_error_bad_value);
9770 asection *osec = sec->output_section;
9772 /* If we have discarded a section, the output
9773 section will be the absolute section. In
9774 case of discarded SEC_MERGE sections, use
9775 the kept section. relocate_section should
9776 have already handled discarded linkonce
9778 if (bfd_is_abs_section (osec)
9779 && sec->kept_section != NULL
9780 && sec->kept_section->output_section != NULL)
9782 osec = sec->kept_section->output_section;
9783 irela->r_addend -= osec->vma;
9786 if (!bfd_is_abs_section (osec))
9788 r_symndx = osec->target_index;
9789 if (r_symndx == STN_UNDEF)
9791 irela->r_addend += osec->vma;
9792 osec = _bfd_nearby_section (output_bfd, osec,
9794 irela->r_addend -= osec->vma;
9795 r_symndx = osec->target_index;
9800 /* Adjust the addend according to where the
9801 section winds up in the output section. */
9803 irela->r_addend += sec->output_offset;
9807 if (flinfo->indices[r_symndx] == -1)
9809 unsigned long shlink;
9814 if (flinfo->info->strip == strip_all)
9816 /* You can't do ld -r -s. */
9817 bfd_set_error (bfd_error_invalid_operation);
9821 /* This symbol was skipped earlier, but
9822 since it is needed by a reloc, we
9823 must output it now. */
9824 shlink = symtab_hdr->sh_link;
9825 name = (bfd_elf_string_from_elf_section
9826 (input_bfd, shlink, sym.st_name));
9830 osec = sec->output_section;
9832 _bfd_elf_section_from_bfd_section (output_bfd,
9834 if (sym.st_shndx == SHN_BAD)
9837 sym.st_value += sec->output_offset;
9838 if (!flinfo->info->relocatable)
9840 sym.st_value += osec->vma;
9841 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
9843 /* STT_TLS symbols are relative to PT_TLS
9845 BFD_ASSERT (elf_hash_table (flinfo->info)
9847 sym.st_value -= (elf_hash_table (flinfo->info)
9852 indx = bfd_get_symcount (output_bfd);
9853 ret = elf_link_output_sym (flinfo, name, &sym, sec,
9858 flinfo->indices[r_symndx] = indx;
9863 r_symndx = flinfo->indices[r_symndx];
9866 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
9867 | (irela->r_info & r_type_mask));
9870 /* Swap out the relocs. */
9871 input_rel_hdr = esdi->rel.hdr;
9872 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
9874 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9879 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
9880 * bed->s->int_rels_per_ext_rel);
9881 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
9884 input_rela_hdr = esdi->rela.hdr;
9885 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
9887 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9896 /* Write out the modified section contents. */
9897 if (bed->elf_backend_write_section
9898 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
9901 /* Section written out. */
9903 else switch (o->sec_info_type)
9905 case SEC_INFO_TYPE_STABS:
9906 if (! (_bfd_write_section_stabs
9908 &elf_hash_table (flinfo->info)->stab_info,
9909 o, &elf_section_data (o)->sec_info, contents)))
9912 case SEC_INFO_TYPE_MERGE:
9913 if (! _bfd_write_merged_section (output_bfd, o,
9914 elf_section_data (o)->sec_info))
9917 case SEC_INFO_TYPE_EH_FRAME:
9919 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
9926 /* FIXME: octets_per_byte. */
9927 if (! (o->flags & SEC_EXCLUDE))
9929 file_ptr offset = (file_ptr) o->output_offset;
9930 bfd_size_type todo = o->size;
9931 if ((o->flags & SEC_ELF_REVERSE_COPY))
9933 /* Reverse-copy input section to output. */
9936 todo -= address_size;
9937 if (! bfd_set_section_contents (output_bfd,
9945 offset += address_size;
9949 else if (! bfd_set_section_contents (output_bfd,
9963 /* Generate a reloc when linking an ELF file. This is a reloc
9964 requested by the linker, and does not come from any input file. This
9965 is used to build constructor and destructor tables when linking
9969 elf_reloc_link_order (bfd *output_bfd,
9970 struct bfd_link_info *info,
9971 asection *output_section,
9972 struct bfd_link_order *link_order)
9974 reloc_howto_type *howto;
9978 struct bfd_elf_section_reloc_data *reldata;
9979 struct elf_link_hash_entry **rel_hash_ptr;
9980 Elf_Internal_Shdr *rel_hdr;
9981 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
9982 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
9985 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
9987 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
9990 bfd_set_error (bfd_error_bad_value);
9994 addend = link_order->u.reloc.p->addend;
9997 reldata = &esdo->rel;
9998 else if (esdo->rela.hdr)
9999 reldata = &esdo->rela;
10006 /* Figure out the symbol index. */
10007 rel_hash_ptr = reldata->hashes + reldata->count;
10008 if (link_order->type == bfd_section_reloc_link_order)
10010 indx = link_order->u.reloc.p->u.section->target_index;
10011 BFD_ASSERT (indx != 0);
10012 *rel_hash_ptr = NULL;
10016 struct elf_link_hash_entry *h;
10018 /* Treat a reloc against a defined symbol as though it were
10019 actually against the section. */
10020 h = ((struct elf_link_hash_entry *)
10021 bfd_wrapped_link_hash_lookup (output_bfd, info,
10022 link_order->u.reloc.p->u.name,
10023 FALSE, FALSE, TRUE));
10025 && (h->root.type == bfd_link_hash_defined
10026 || h->root.type == bfd_link_hash_defweak))
10030 section = h->root.u.def.section;
10031 indx = section->output_section->target_index;
10032 *rel_hash_ptr = NULL;
10033 /* It seems that we ought to add the symbol value to the
10034 addend here, but in practice it has already been added
10035 because it was passed to constructor_callback. */
10036 addend += section->output_section->vma + section->output_offset;
10038 else if (h != NULL)
10040 /* Setting the index to -2 tells elf_link_output_extsym that
10041 this symbol is used by a reloc. */
10048 if (! ((*info->callbacks->unattached_reloc)
10049 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10055 /* If this is an inplace reloc, we must write the addend into the
10057 if (howto->partial_inplace && addend != 0)
10059 bfd_size_type size;
10060 bfd_reloc_status_type rstat;
10063 const char *sym_name;
10065 size = (bfd_size_type) bfd_get_reloc_size (howto);
10066 buf = (bfd_byte *) bfd_zmalloc (size);
10069 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10076 case bfd_reloc_outofrange:
10079 case bfd_reloc_overflow:
10080 if (link_order->type == bfd_section_reloc_link_order)
10081 sym_name = bfd_section_name (output_bfd,
10082 link_order->u.reloc.p->u.section);
10084 sym_name = link_order->u.reloc.p->u.name;
10085 if (! ((*info->callbacks->reloc_overflow)
10086 (info, NULL, sym_name, howto->name, addend, NULL,
10087 NULL, (bfd_vma) 0)))
10094 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10095 link_order->offset, size);
10101 /* The address of a reloc is relative to the section in a
10102 relocatable file, and is a virtual address in an executable
10104 offset = link_order->offset;
10105 if (! info->relocatable)
10106 offset += output_section->vma;
10108 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10110 irel[i].r_offset = offset;
10111 irel[i].r_info = 0;
10112 irel[i].r_addend = 0;
10114 if (bed->s->arch_size == 32)
10115 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10117 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10119 rel_hdr = reldata->hdr;
10120 erel = rel_hdr->contents;
10121 if (rel_hdr->sh_type == SHT_REL)
10123 erel += reldata->count * bed->s->sizeof_rel;
10124 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10128 irel[0].r_addend = addend;
10129 erel += reldata->count * bed->s->sizeof_rela;
10130 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10139 /* Get the output vma of the section pointed to by the sh_link field. */
10142 elf_get_linked_section_vma (struct bfd_link_order *p)
10144 Elf_Internal_Shdr **elf_shdrp;
10148 s = p->u.indirect.section;
10149 elf_shdrp = elf_elfsections (s->owner);
10150 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10151 elfsec = elf_shdrp[elfsec]->sh_link;
10153 The Intel C compiler generates SHT_IA_64_UNWIND with
10154 SHF_LINK_ORDER. But it doesn't set the sh_link or
10155 sh_info fields. Hence we could get the situation
10156 where elfsec is 0. */
10159 const struct elf_backend_data *bed
10160 = get_elf_backend_data (s->owner);
10161 if (bed->link_order_error_handler)
10162 bed->link_order_error_handler
10163 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10168 s = elf_shdrp[elfsec]->bfd_section;
10169 return s->output_section->vma + s->output_offset;
10174 /* Compare two sections based on the locations of the sections they are
10175 linked to. Used by elf_fixup_link_order. */
10178 compare_link_order (const void * a, const void * b)
10183 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10184 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10187 return apos > bpos;
10191 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10192 order as their linked sections. Returns false if this could not be done
10193 because an output section includes both ordered and unordered
10194 sections. Ideally we'd do this in the linker proper. */
10197 elf_fixup_link_order (bfd *abfd, asection *o)
10199 int seen_linkorder;
10202 struct bfd_link_order *p;
10204 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10206 struct bfd_link_order **sections;
10207 asection *s, *other_sec, *linkorder_sec;
10211 linkorder_sec = NULL;
10213 seen_linkorder = 0;
10214 for (p = o->map_head.link_order; p != NULL; p = p->next)
10216 if (p->type == bfd_indirect_link_order)
10218 s = p->u.indirect.section;
10220 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10221 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10222 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10223 && elfsec < elf_numsections (sub)
10224 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10225 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10239 if (seen_other && seen_linkorder)
10241 if (other_sec && linkorder_sec)
10242 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10244 linkorder_sec->owner, other_sec,
10247 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10249 bfd_set_error (bfd_error_bad_value);
10254 if (!seen_linkorder)
10257 sections = (struct bfd_link_order **)
10258 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10259 if (sections == NULL)
10261 seen_linkorder = 0;
10263 for (p = o->map_head.link_order; p != NULL; p = p->next)
10265 sections[seen_linkorder++] = p;
10267 /* Sort the input sections in the order of their linked section. */
10268 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10269 compare_link_order);
10271 /* Change the offsets of the sections. */
10273 for (n = 0; n < seen_linkorder; n++)
10275 s = sections[n]->u.indirect.section;
10276 offset &= ~(bfd_vma) 0 << s->alignment_power;
10277 s->output_offset = offset;
10278 sections[n]->offset = offset;
10279 /* FIXME: octets_per_byte. */
10280 offset += sections[n]->size;
10288 /* Do the final step of an ELF link. */
10291 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10293 bfd_boolean dynamic;
10294 bfd_boolean emit_relocs;
10296 struct elf_final_link_info flinfo;
10298 struct bfd_link_order *p;
10300 bfd_size_type max_contents_size;
10301 bfd_size_type max_external_reloc_size;
10302 bfd_size_type max_internal_reloc_count;
10303 bfd_size_type max_sym_count;
10304 bfd_size_type max_sym_shndx_count;
10306 Elf_Internal_Sym elfsym;
10308 Elf_Internal_Shdr *symtab_hdr;
10309 Elf_Internal_Shdr *symtab_shndx_hdr;
10310 Elf_Internal_Shdr *symstrtab_hdr;
10311 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10312 struct elf_outext_info eoinfo;
10313 bfd_boolean merged;
10314 size_t relativecount = 0;
10315 asection *reldyn = 0;
10317 asection *attr_section = NULL;
10318 bfd_vma attr_size = 0;
10319 const char *std_attrs_section;
10321 if (! is_elf_hash_table (info->hash))
10325 abfd->flags |= DYNAMIC;
10327 dynamic = elf_hash_table (info)->dynamic_sections_created;
10328 dynobj = elf_hash_table (info)->dynobj;
10330 emit_relocs = (info->relocatable
10331 || info->emitrelocations);
10333 flinfo.info = info;
10334 flinfo.output_bfd = abfd;
10335 flinfo.symstrtab = _bfd_elf_stringtab_init ();
10336 if (flinfo.symstrtab == NULL)
10341 flinfo.dynsym_sec = NULL;
10342 flinfo.hash_sec = NULL;
10343 flinfo.symver_sec = NULL;
10347 flinfo.dynsym_sec = bfd_get_linker_section (dynobj, ".dynsym");
10348 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
10349 /* Note that dynsym_sec can be NULL (on VMS). */
10350 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
10351 /* Note that it is OK if symver_sec is NULL. */
10354 flinfo.contents = NULL;
10355 flinfo.external_relocs = NULL;
10356 flinfo.internal_relocs = NULL;
10357 flinfo.external_syms = NULL;
10358 flinfo.locsym_shndx = NULL;
10359 flinfo.internal_syms = NULL;
10360 flinfo.indices = NULL;
10361 flinfo.sections = NULL;
10362 flinfo.symbuf = NULL;
10363 flinfo.symshndxbuf = NULL;
10364 flinfo.symbuf_count = 0;
10365 flinfo.shndxbuf_size = 0;
10366 flinfo.filesym_count = 0;
10368 /* The object attributes have been merged. Remove the input
10369 sections from the link, and set the contents of the output
10371 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10372 for (o = abfd->sections; o != NULL; o = o->next)
10374 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10375 || strcmp (o->name, ".gnu.attributes") == 0)
10377 for (p = o->map_head.link_order; p != NULL; p = p->next)
10379 asection *input_section;
10381 if (p->type != bfd_indirect_link_order)
10383 input_section = p->u.indirect.section;
10384 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10385 elf_link_input_bfd ignores this section. */
10386 input_section->flags &= ~SEC_HAS_CONTENTS;
10389 attr_size = bfd_elf_obj_attr_size (abfd);
10392 bfd_set_section_size (abfd, o, attr_size);
10394 /* Skip this section later on. */
10395 o->map_head.link_order = NULL;
10398 o->flags |= SEC_EXCLUDE;
10402 /* Count up the number of relocations we will output for each output
10403 section, so that we know the sizes of the reloc sections. We
10404 also figure out some maximum sizes. */
10405 max_contents_size = 0;
10406 max_external_reloc_size = 0;
10407 max_internal_reloc_count = 0;
10409 max_sym_shndx_count = 0;
10411 for (o = abfd->sections; o != NULL; o = o->next)
10413 struct bfd_elf_section_data *esdo = elf_section_data (o);
10414 o->reloc_count = 0;
10416 for (p = o->map_head.link_order; p != NULL; p = p->next)
10418 unsigned int reloc_count = 0;
10419 struct bfd_elf_section_data *esdi = NULL;
10421 if (p->type == bfd_section_reloc_link_order
10422 || p->type == bfd_symbol_reloc_link_order)
10424 else if (p->type == bfd_indirect_link_order)
10428 sec = p->u.indirect.section;
10429 esdi = elf_section_data (sec);
10431 /* Mark all sections which are to be included in the
10432 link. This will normally be every section. We need
10433 to do this so that we can identify any sections which
10434 the linker has decided to not include. */
10435 sec->linker_mark = TRUE;
10437 if (sec->flags & SEC_MERGE)
10440 if (esdo->this_hdr.sh_type == SHT_REL
10441 || esdo->this_hdr.sh_type == SHT_RELA)
10442 /* Some backends use reloc_count in relocation sections
10443 to count particular types of relocs. Of course,
10444 reloc sections themselves can't have relocations. */
10446 else if (info->relocatable || info->emitrelocations)
10447 reloc_count = sec->reloc_count;
10448 else if (bed->elf_backend_count_relocs)
10449 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10451 if (sec->rawsize > max_contents_size)
10452 max_contents_size = sec->rawsize;
10453 if (sec->size > max_contents_size)
10454 max_contents_size = sec->size;
10456 /* We are interested in just local symbols, not all
10458 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10459 && (sec->owner->flags & DYNAMIC) == 0)
10463 if (elf_bad_symtab (sec->owner))
10464 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10465 / bed->s->sizeof_sym);
10467 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10469 if (sym_count > max_sym_count)
10470 max_sym_count = sym_count;
10472 if (sym_count > max_sym_shndx_count
10473 && elf_symtab_shndx (sec->owner) != 0)
10474 max_sym_shndx_count = sym_count;
10476 if ((sec->flags & SEC_RELOC) != 0)
10478 size_t ext_size = 0;
10480 if (esdi->rel.hdr != NULL)
10481 ext_size = esdi->rel.hdr->sh_size;
10482 if (esdi->rela.hdr != NULL)
10483 ext_size += esdi->rela.hdr->sh_size;
10485 if (ext_size > max_external_reloc_size)
10486 max_external_reloc_size = ext_size;
10487 if (sec->reloc_count > max_internal_reloc_count)
10488 max_internal_reloc_count = sec->reloc_count;
10493 if (reloc_count == 0)
10496 o->reloc_count += reloc_count;
10498 if (p->type == bfd_indirect_link_order
10499 && (info->relocatable || info->emitrelocations))
10502 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
10503 if (esdi->rela.hdr)
10504 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
10509 esdo->rela.count += reloc_count;
10511 esdo->rel.count += reloc_count;
10515 if (o->reloc_count > 0)
10516 o->flags |= SEC_RELOC;
10519 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10520 set it (this is probably a bug) and if it is set
10521 assign_section_numbers will create a reloc section. */
10522 o->flags &=~ SEC_RELOC;
10525 /* If the SEC_ALLOC flag is not set, force the section VMA to
10526 zero. This is done in elf_fake_sections as well, but forcing
10527 the VMA to 0 here will ensure that relocs against these
10528 sections are handled correctly. */
10529 if ((o->flags & SEC_ALLOC) == 0
10530 && ! o->user_set_vma)
10534 if (! info->relocatable && merged)
10535 elf_link_hash_traverse (elf_hash_table (info),
10536 _bfd_elf_link_sec_merge_syms, abfd);
10538 /* Figure out the file positions for everything but the symbol table
10539 and the relocs. We set symcount to force assign_section_numbers
10540 to create a symbol table. */
10541 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
10542 BFD_ASSERT (! abfd->output_has_begun);
10543 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10546 /* Set sizes, and assign file positions for reloc sections. */
10547 for (o = abfd->sections; o != NULL; o = o->next)
10549 struct bfd_elf_section_data *esdo = elf_section_data (o);
10550 if ((o->flags & SEC_RELOC) != 0)
10553 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
10557 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
10561 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10562 to count upwards while actually outputting the relocations. */
10563 esdo->rel.count = 0;
10564 esdo->rela.count = 0;
10567 _bfd_elf_assign_file_positions_for_relocs (abfd);
10569 /* We have now assigned file positions for all the sections except
10570 .symtab and .strtab. We start the .symtab section at the current
10571 file position, and write directly to it. We build the .strtab
10572 section in memory. */
10573 bfd_get_symcount (abfd) = 0;
10574 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10575 /* sh_name is set in prep_headers. */
10576 symtab_hdr->sh_type = SHT_SYMTAB;
10577 /* sh_flags, sh_addr and sh_size all start off zero. */
10578 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10579 /* sh_link is set in assign_section_numbers. */
10580 /* sh_info is set below. */
10581 /* sh_offset is set just below. */
10582 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10584 off = elf_tdata (abfd)->next_file_pos;
10585 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10587 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10588 incorrect. We do not yet know the size of the .symtab section.
10589 We correct next_file_pos below, after we do know the size. */
10591 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10592 continuously seeking to the right position in the file. */
10593 if (! info->keep_memory || max_sym_count < 20)
10594 flinfo.symbuf_size = 20;
10596 flinfo.symbuf_size = max_sym_count;
10597 amt = flinfo.symbuf_size;
10598 amt *= bed->s->sizeof_sym;
10599 flinfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10600 if (flinfo.symbuf == NULL)
10602 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10604 /* Wild guess at number of output symbols. realloc'd as needed. */
10605 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10606 flinfo.shndxbuf_size = amt;
10607 amt *= sizeof (Elf_External_Sym_Shndx);
10608 flinfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10609 if (flinfo.symshndxbuf == NULL)
10613 /* Start writing out the symbol table. The first symbol is always a
10615 if (info->strip != strip_all
10618 elfsym.st_value = 0;
10619 elfsym.st_size = 0;
10620 elfsym.st_info = 0;
10621 elfsym.st_other = 0;
10622 elfsym.st_shndx = SHN_UNDEF;
10623 elfsym.st_target_internal = 0;
10624 if (elf_link_output_sym (&flinfo, NULL, &elfsym, bfd_und_section_ptr,
10629 /* Output a symbol for each section. We output these even if we are
10630 discarding local symbols, since they are used for relocs. These
10631 symbols have no names. We store the index of each one in the
10632 index field of the section, so that we can find it again when
10633 outputting relocs. */
10634 if (info->strip != strip_all
10637 elfsym.st_size = 0;
10638 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10639 elfsym.st_other = 0;
10640 elfsym.st_value = 0;
10641 elfsym.st_target_internal = 0;
10642 for (i = 1; i < elf_numsections (abfd); i++)
10644 o = bfd_section_from_elf_index (abfd, i);
10647 o->target_index = bfd_get_symcount (abfd);
10648 elfsym.st_shndx = i;
10649 if (!info->relocatable)
10650 elfsym.st_value = o->vma;
10651 if (elf_link_output_sym (&flinfo, NULL, &elfsym, o, NULL) != 1)
10657 /* Allocate some memory to hold information read in from the input
10659 if (max_contents_size != 0)
10661 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10662 if (flinfo.contents == NULL)
10666 if (max_external_reloc_size != 0)
10668 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
10669 if (flinfo.external_relocs == NULL)
10673 if (max_internal_reloc_count != 0)
10675 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10676 amt *= sizeof (Elf_Internal_Rela);
10677 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10678 if (flinfo.internal_relocs == NULL)
10682 if (max_sym_count != 0)
10684 amt = max_sym_count * bed->s->sizeof_sym;
10685 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
10686 if (flinfo.external_syms == NULL)
10689 amt = max_sym_count * sizeof (Elf_Internal_Sym);
10690 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
10691 if (flinfo.internal_syms == NULL)
10694 amt = max_sym_count * sizeof (long);
10695 flinfo.indices = (long int *) bfd_malloc (amt);
10696 if (flinfo.indices == NULL)
10699 amt = max_sym_count * sizeof (asection *);
10700 flinfo.sections = (asection **) bfd_malloc (amt);
10701 if (flinfo.sections == NULL)
10705 if (max_sym_shndx_count != 0)
10707 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
10708 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
10709 if (flinfo.locsym_shndx == NULL)
10713 if (elf_hash_table (info)->tls_sec)
10715 bfd_vma base, end = 0;
10718 for (sec = elf_hash_table (info)->tls_sec;
10719 sec && (sec->flags & SEC_THREAD_LOCAL);
10722 bfd_size_type size = sec->size;
10725 && (sec->flags & SEC_HAS_CONTENTS) == 0)
10727 struct bfd_link_order *ord = sec->map_tail.link_order;
10730 size = ord->offset + ord->size;
10732 end = sec->vma + size;
10734 base = elf_hash_table (info)->tls_sec->vma;
10735 /* Only align end of TLS section if static TLS doesn't have special
10736 alignment requirements. */
10737 if (bed->static_tls_alignment == 1)
10738 end = align_power (end,
10739 elf_hash_table (info)->tls_sec->alignment_power);
10740 elf_hash_table (info)->tls_size = end - base;
10743 /* Reorder SHF_LINK_ORDER sections. */
10744 for (o = abfd->sections; o != NULL; o = o->next)
10746 if (!elf_fixup_link_order (abfd, o))
10750 /* Since ELF permits relocations to be against local symbols, we
10751 must have the local symbols available when we do the relocations.
10752 Since we would rather only read the local symbols once, and we
10753 would rather not keep them in memory, we handle all the
10754 relocations for a single input file at the same time.
10756 Unfortunately, there is no way to know the total number of local
10757 symbols until we have seen all of them, and the local symbol
10758 indices precede the global symbol indices. This means that when
10759 we are generating relocatable output, and we see a reloc against
10760 a global symbol, we can not know the symbol index until we have
10761 finished examining all the local symbols to see which ones we are
10762 going to output. To deal with this, we keep the relocations in
10763 memory, and don't output them until the end of the link. This is
10764 an unfortunate waste of memory, but I don't see a good way around
10765 it. Fortunately, it only happens when performing a relocatable
10766 link, which is not the common case. FIXME: If keep_memory is set
10767 we could write the relocs out and then read them again; I don't
10768 know how bad the memory loss will be. */
10770 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10771 sub->output_has_begun = FALSE;
10772 for (o = abfd->sections; o != NULL; o = o->next)
10774 for (p = o->map_head.link_order; p != NULL; p = p->next)
10776 if (p->type == bfd_indirect_link_order
10777 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
10778 == bfd_target_elf_flavour)
10779 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
10781 if (! sub->output_has_begun)
10783 if (! elf_link_input_bfd (&flinfo, sub))
10785 sub->output_has_begun = TRUE;
10788 else if (p->type == bfd_section_reloc_link_order
10789 || p->type == bfd_symbol_reloc_link_order)
10791 if (! elf_reloc_link_order (abfd, info, o, p))
10796 if (! _bfd_default_link_order (abfd, info, o, p))
10798 if (p->type == bfd_indirect_link_order
10799 && (bfd_get_flavour (sub)
10800 == bfd_target_elf_flavour)
10801 && (elf_elfheader (sub)->e_ident[EI_CLASS]
10802 != bed->s->elfclass))
10804 const char *iclass, *oclass;
10806 if (bed->s->elfclass == ELFCLASS64)
10808 iclass = "ELFCLASS32";
10809 oclass = "ELFCLASS64";
10813 iclass = "ELFCLASS64";
10814 oclass = "ELFCLASS32";
10817 bfd_set_error (bfd_error_wrong_format);
10818 (*_bfd_error_handler)
10819 (_("%B: file class %s incompatible with %s"),
10820 sub, iclass, oclass);
10829 /* Free symbol buffer if needed. */
10830 if (!info->reduce_memory_overheads)
10832 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10833 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10834 && elf_tdata (sub)->symbuf)
10836 free (elf_tdata (sub)->symbuf);
10837 elf_tdata (sub)->symbuf = NULL;
10841 /* Output a FILE symbol so that following locals are not associated
10842 with the wrong input file. */
10843 memset (&elfsym, 0, sizeof (elfsym));
10844 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
10845 elfsym.st_shndx = SHN_ABS;
10847 if (flinfo.filesym_count > 1
10848 && !elf_link_output_sym (&flinfo, NULL, &elfsym,
10849 bfd_und_section_ptr, NULL))
10852 /* Output any global symbols that got converted to local in a
10853 version script or due to symbol visibility. We do this in a
10854 separate step since ELF requires all local symbols to appear
10855 prior to any global symbols. FIXME: We should only do this if
10856 some global symbols were, in fact, converted to become local.
10857 FIXME: Will this work correctly with the Irix 5 linker? */
10858 eoinfo.failed = FALSE;
10859 eoinfo.flinfo = &flinfo;
10860 eoinfo.localsyms = TRUE;
10861 eoinfo.need_second_pass = FALSE;
10862 eoinfo.second_pass = FALSE;
10863 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
10867 if (flinfo.filesym_count == 1
10868 && !elf_link_output_sym (&flinfo, NULL, &elfsym,
10869 bfd_und_section_ptr, NULL))
10872 if (eoinfo.need_second_pass)
10874 eoinfo.second_pass = TRUE;
10875 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
10880 /* If backend needs to output some local symbols not present in the hash
10881 table, do it now. */
10882 if (bed->elf_backend_output_arch_local_syms)
10884 typedef int (*out_sym_func)
10885 (void *, const char *, Elf_Internal_Sym *, asection *,
10886 struct elf_link_hash_entry *);
10888 if (! ((*bed->elf_backend_output_arch_local_syms)
10889 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
10893 /* That wrote out all the local symbols. Finish up the symbol table
10894 with the global symbols. Even if we want to strip everything we
10895 can, we still need to deal with those global symbols that got
10896 converted to local in a version script. */
10898 /* The sh_info field records the index of the first non local symbol. */
10899 symtab_hdr->sh_info = bfd_get_symcount (abfd);
10902 && flinfo.dynsym_sec != NULL
10903 && flinfo.dynsym_sec->output_section != bfd_abs_section_ptr)
10905 Elf_Internal_Sym sym;
10906 bfd_byte *dynsym = flinfo.dynsym_sec->contents;
10907 long last_local = 0;
10909 /* Write out the section symbols for the output sections. */
10910 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
10916 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10918 sym.st_target_internal = 0;
10920 for (s = abfd->sections; s != NULL; s = s->next)
10926 dynindx = elf_section_data (s)->dynindx;
10929 indx = elf_section_data (s)->this_idx;
10930 BFD_ASSERT (indx > 0);
10931 sym.st_shndx = indx;
10932 if (! check_dynsym (abfd, &sym))
10934 sym.st_value = s->vma;
10935 dest = dynsym + dynindx * bed->s->sizeof_sym;
10936 if (last_local < dynindx)
10937 last_local = dynindx;
10938 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10942 /* Write out the local dynsyms. */
10943 if (elf_hash_table (info)->dynlocal)
10945 struct elf_link_local_dynamic_entry *e;
10946 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
10951 /* Copy the internal symbol and turn off visibility.
10952 Note that we saved a word of storage and overwrote
10953 the original st_name with the dynstr_index. */
10955 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
10957 s = bfd_section_from_elf_index (e->input_bfd,
10962 elf_section_data (s->output_section)->this_idx;
10963 if (! check_dynsym (abfd, &sym))
10965 sym.st_value = (s->output_section->vma
10967 + e->isym.st_value);
10970 if (last_local < e->dynindx)
10971 last_local = e->dynindx;
10973 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
10974 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10978 elf_section_data (flinfo.dynsym_sec->output_section)->this_hdr.sh_info =
10982 /* We get the global symbols from the hash table. */
10983 eoinfo.failed = FALSE;
10984 eoinfo.localsyms = FALSE;
10985 eoinfo.flinfo = &flinfo;
10986 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
10990 /* If backend needs to output some symbols not present in the hash
10991 table, do it now. */
10992 if (bed->elf_backend_output_arch_syms)
10994 typedef int (*out_sym_func)
10995 (void *, const char *, Elf_Internal_Sym *, asection *,
10996 struct elf_link_hash_entry *);
10998 if (! ((*bed->elf_backend_output_arch_syms)
10999 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11003 /* Flush all symbols to the file. */
11004 if (! elf_link_flush_output_syms (&flinfo, bed))
11007 /* Now we know the size of the symtab section. */
11008 off += symtab_hdr->sh_size;
11010 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
11011 if (symtab_shndx_hdr->sh_name != 0)
11013 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11014 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11015 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11016 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11017 symtab_shndx_hdr->sh_size = amt;
11019 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11022 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11023 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11028 /* Finish up and write out the symbol string table (.strtab)
11030 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11031 /* sh_name was set in prep_headers. */
11032 symstrtab_hdr->sh_type = SHT_STRTAB;
11033 symstrtab_hdr->sh_flags = 0;
11034 symstrtab_hdr->sh_addr = 0;
11035 symstrtab_hdr->sh_size = _bfd_stringtab_size (flinfo.symstrtab);
11036 symstrtab_hdr->sh_entsize = 0;
11037 symstrtab_hdr->sh_link = 0;
11038 symstrtab_hdr->sh_info = 0;
11039 /* sh_offset is set just below. */
11040 symstrtab_hdr->sh_addralign = 1;
11042 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
11043 elf_tdata (abfd)->next_file_pos = off;
11045 if (bfd_get_symcount (abfd) > 0)
11047 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11048 || ! _bfd_stringtab_emit (abfd, flinfo.symstrtab))
11052 /* Adjust the relocs to have the correct symbol indices. */
11053 for (o = abfd->sections; o != NULL; o = o->next)
11055 struct bfd_elf_section_data *esdo = elf_section_data (o);
11056 if ((o->flags & SEC_RELOC) == 0)
11059 if (esdo->rel.hdr != NULL)
11060 elf_link_adjust_relocs (abfd, &esdo->rel);
11061 if (esdo->rela.hdr != NULL)
11062 elf_link_adjust_relocs (abfd, &esdo->rela);
11064 /* Set the reloc_count field to 0 to prevent write_relocs from
11065 trying to swap the relocs out itself. */
11066 o->reloc_count = 0;
11069 if (dynamic && info->combreloc && dynobj != NULL)
11070 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11072 /* If we are linking against a dynamic object, or generating a
11073 shared library, finish up the dynamic linking information. */
11076 bfd_byte *dyncon, *dynconend;
11078 /* Fix up .dynamic entries. */
11079 o = bfd_get_linker_section (dynobj, ".dynamic");
11080 BFD_ASSERT (o != NULL);
11082 dyncon = o->contents;
11083 dynconend = o->contents + o->size;
11084 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11086 Elf_Internal_Dyn dyn;
11090 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11097 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11099 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11101 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11102 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11105 dyn.d_un.d_val = relativecount;
11112 name = info->init_function;
11115 name = info->fini_function;
11118 struct elf_link_hash_entry *h;
11120 h = elf_link_hash_lookup (elf_hash_table (info), name,
11121 FALSE, FALSE, TRUE);
11123 && (h->root.type == bfd_link_hash_defined
11124 || h->root.type == bfd_link_hash_defweak))
11126 dyn.d_un.d_ptr = h->root.u.def.value;
11127 o = h->root.u.def.section;
11128 if (o->output_section != NULL)
11129 dyn.d_un.d_ptr += (o->output_section->vma
11130 + o->output_offset);
11133 /* The symbol is imported from another shared
11134 library and does not apply to this one. */
11135 dyn.d_un.d_ptr = 0;
11142 case DT_PREINIT_ARRAYSZ:
11143 name = ".preinit_array";
11145 case DT_INIT_ARRAYSZ:
11146 name = ".init_array";
11148 case DT_FINI_ARRAYSZ:
11149 name = ".fini_array";
11151 o = bfd_get_section_by_name (abfd, name);
11154 (*_bfd_error_handler)
11155 (_("%B: could not find output section %s"), abfd, name);
11159 (*_bfd_error_handler)
11160 (_("warning: %s section has zero size"), name);
11161 dyn.d_un.d_val = o->size;
11164 case DT_PREINIT_ARRAY:
11165 name = ".preinit_array";
11167 case DT_INIT_ARRAY:
11168 name = ".init_array";
11170 case DT_FINI_ARRAY:
11171 name = ".fini_array";
11178 name = ".gnu.hash";
11187 name = ".gnu.version_d";
11190 name = ".gnu.version_r";
11193 name = ".gnu.version";
11195 o = bfd_get_section_by_name (abfd, name);
11198 (*_bfd_error_handler)
11199 (_("%B: could not find output section %s"), abfd, name);
11202 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11204 (*_bfd_error_handler)
11205 (_("warning: section '%s' is being made into a note"), name);
11206 bfd_set_error (bfd_error_nonrepresentable_section);
11209 dyn.d_un.d_ptr = o->vma;
11216 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11220 dyn.d_un.d_val = 0;
11221 dyn.d_un.d_ptr = 0;
11222 for (i = 1; i < elf_numsections (abfd); i++)
11224 Elf_Internal_Shdr *hdr;
11226 hdr = elf_elfsections (abfd)[i];
11227 if (hdr->sh_type == type
11228 && (hdr->sh_flags & SHF_ALLOC) != 0)
11230 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11231 dyn.d_un.d_val += hdr->sh_size;
11234 if (dyn.d_un.d_ptr == 0
11235 || hdr->sh_addr < dyn.d_un.d_ptr)
11236 dyn.d_un.d_ptr = hdr->sh_addr;
11242 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11246 /* If we have created any dynamic sections, then output them. */
11247 if (dynobj != NULL)
11249 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11252 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11253 if (((info->warn_shared_textrel && info->shared)
11254 || info->error_textrel)
11255 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11257 bfd_byte *dyncon, *dynconend;
11259 dyncon = o->contents;
11260 dynconend = o->contents + o->size;
11261 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11263 Elf_Internal_Dyn dyn;
11265 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11267 if (dyn.d_tag == DT_TEXTREL)
11269 if (info->error_textrel)
11270 info->callbacks->einfo
11271 (_("%P%X: read-only segment has dynamic relocations.\n"));
11273 info->callbacks->einfo
11274 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11280 for (o = dynobj->sections; o != NULL; o = o->next)
11282 if ((o->flags & SEC_HAS_CONTENTS) == 0
11284 || o->output_section == bfd_abs_section_ptr)
11286 if ((o->flags & SEC_LINKER_CREATED) == 0)
11288 /* At this point, we are only interested in sections
11289 created by _bfd_elf_link_create_dynamic_sections. */
11292 if (elf_hash_table (info)->stab_info.stabstr == o)
11294 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11296 if (strcmp (o->name, ".dynstr") != 0)
11298 /* FIXME: octets_per_byte. */
11299 if (! bfd_set_section_contents (abfd, o->output_section,
11301 (file_ptr) o->output_offset,
11307 /* The contents of the .dynstr section are actually in a
11309 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11310 if (bfd_seek (abfd, off, SEEK_SET) != 0
11311 || ! _bfd_elf_strtab_emit (abfd,
11312 elf_hash_table (info)->dynstr))
11318 if (info->relocatable)
11320 bfd_boolean failed = FALSE;
11322 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11327 /* If we have optimized stabs strings, output them. */
11328 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11330 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11334 if (info->eh_frame_hdr)
11336 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11340 if (flinfo.symstrtab != NULL)
11341 _bfd_stringtab_free (flinfo.symstrtab);
11342 if (flinfo.contents != NULL)
11343 free (flinfo.contents);
11344 if (flinfo.external_relocs != NULL)
11345 free (flinfo.external_relocs);
11346 if (flinfo.internal_relocs != NULL)
11347 free (flinfo.internal_relocs);
11348 if (flinfo.external_syms != NULL)
11349 free (flinfo.external_syms);
11350 if (flinfo.locsym_shndx != NULL)
11351 free (flinfo.locsym_shndx);
11352 if (flinfo.internal_syms != NULL)
11353 free (flinfo.internal_syms);
11354 if (flinfo.indices != NULL)
11355 free (flinfo.indices);
11356 if (flinfo.sections != NULL)
11357 free (flinfo.sections);
11358 if (flinfo.symbuf != NULL)
11359 free (flinfo.symbuf);
11360 if (flinfo.symshndxbuf != NULL)
11361 free (flinfo.symshndxbuf);
11362 for (o = abfd->sections; o != NULL; o = o->next)
11364 struct bfd_elf_section_data *esdo = elf_section_data (o);
11365 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
11366 free (esdo->rel.hashes);
11367 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
11368 free (esdo->rela.hashes);
11371 elf_tdata (abfd)->linker = TRUE;
11375 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11376 if (contents == NULL)
11377 return FALSE; /* Bail out and fail. */
11378 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11379 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11386 if (flinfo.symstrtab != NULL)
11387 _bfd_stringtab_free (flinfo.symstrtab);
11388 if (flinfo.contents != NULL)
11389 free (flinfo.contents);
11390 if (flinfo.external_relocs != NULL)
11391 free (flinfo.external_relocs);
11392 if (flinfo.internal_relocs != NULL)
11393 free (flinfo.internal_relocs);
11394 if (flinfo.external_syms != NULL)
11395 free (flinfo.external_syms);
11396 if (flinfo.locsym_shndx != NULL)
11397 free (flinfo.locsym_shndx);
11398 if (flinfo.internal_syms != NULL)
11399 free (flinfo.internal_syms);
11400 if (flinfo.indices != NULL)
11401 free (flinfo.indices);
11402 if (flinfo.sections != NULL)
11403 free (flinfo.sections);
11404 if (flinfo.symbuf != NULL)
11405 free (flinfo.symbuf);
11406 if (flinfo.symshndxbuf != NULL)
11407 free (flinfo.symshndxbuf);
11408 for (o = abfd->sections; o != NULL; o = o->next)
11410 struct bfd_elf_section_data *esdo = elf_section_data (o);
11411 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
11412 free (esdo->rel.hashes);
11413 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
11414 free (esdo->rela.hashes);
11420 /* Initialize COOKIE for input bfd ABFD. */
11423 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11424 struct bfd_link_info *info, bfd *abfd)
11426 Elf_Internal_Shdr *symtab_hdr;
11427 const struct elf_backend_data *bed;
11429 bed = get_elf_backend_data (abfd);
11430 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11432 cookie->abfd = abfd;
11433 cookie->sym_hashes = elf_sym_hashes (abfd);
11434 cookie->bad_symtab = elf_bad_symtab (abfd);
11435 if (cookie->bad_symtab)
11437 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11438 cookie->extsymoff = 0;
11442 cookie->locsymcount = symtab_hdr->sh_info;
11443 cookie->extsymoff = symtab_hdr->sh_info;
11446 if (bed->s->arch_size == 32)
11447 cookie->r_sym_shift = 8;
11449 cookie->r_sym_shift = 32;
11451 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11452 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11454 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11455 cookie->locsymcount, 0,
11457 if (cookie->locsyms == NULL)
11459 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11462 if (info->keep_memory)
11463 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11468 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11471 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11473 Elf_Internal_Shdr *symtab_hdr;
11475 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11476 if (cookie->locsyms != NULL
11477 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11478 free (cookie->locsyms);
11481 /* Initialize the relocation information in COOKIE for input section SEC
11482 of input bfd ABFD. */
11485 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11486 struct bfd_link_info *info, bfd *abfd,
11489 const struct elf_backend_data *bed;
11491 if (sec->reloc_count == 0)
11493 cookie->rels = NULL;
11494 cookie->relend = NULL;
11498 bed = get_elf_backend_data (abfd);
11500 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11501 info->keep_memory);
11502 if (cookie->rels == NULL)
11504 cookie->rel = cookie->rels;
11505 cookie->relend = (cookie->rels
11506 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11508 cookie->rel = cookie->rels;
11512 /* Free the memory allocated by init_reloc_cookie_rels,
11516 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11519 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11520 free (cookie->rels);
11523 /* Initialize the whole of COOKIE for input section SEC. */
11526 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11527 struct bfd_link_info *info,
11530 if (!init_reloc_cookie (cookie, info, sec->owner))
11532 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11537 fini_reloc_cookie (cookie, sec->owner);
11542 /* Free the memory allocated by init_reloc_cookie_for_section,
11546 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11549 fini_reloc_cookie_rels (cookie, sec);
11550 fini_reloc_cookie (cookie, sec->owner);
11553 /* Garbage collect unused sections. */
11555 /* Default gc_mark_hook. */
11558 _bfd_elf_gc_mark_hook (asection *sec,
11559 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11560 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11561 struct elf_link_hash_entry *h,
11562 Elf_Internal_Sym *sym)
11564 const char *sec_name;
11568 switch (h->root.type)
11570 case bfd_link_hash_defined:
11571 case bfd_link_hash_defweak:
11572 return h->root.u.def.section;
11574 case bfd_link_hash_common:
11575 return h->root.u.c.p->section;
11577 case bfd_link_hash_undefined:
11578 case bfd_link_hash_undefweak:
11579 /* To work around a glibc bug, keep all XXX input sections
11580 when there is an as yet undefined reference to __start_XXX
11581 or __stop_XXX symbols. The linker will later define such
11582 symbols for orphan input sections that have a name
11583 representable as a C identifier. */
11584 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11585 sec_name = h->root.root.string + 8;
11586 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11587 sec_name = h->root.root.string + 7;
11591 if (sec_name && *sec_name != '\0')
11595 for (i = info->input_bfds; i; i = i->link_next)
11597 sec = bfd_get_section_by_name (i, sec_name);
11599 sec->flags |= SEC_KEEP;
11609 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11614 /* COOKIE->rel describes a relocation against section SEC, which is
11615 a section we've decided to keep. Return the section that contains
11616 the relocation symbol, or NULL if no section contains it. */
11619 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11620 elf_gc_mark_hook_fn gc_mark_hook,
11621 struct elf_reloc_cookie *cookie)
11623 unsigned long r_symndx;
11624 struct elf_link_hash_entry *h;
11626 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11627 if (r_symndx == STN_UNDEF)
11630 if (r_symndx >= cookie->locsymcount
11631 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11633 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11634 while (h->root.type == bfd_link_hash_indirect
11635 || h->root.type == bfd_link_hash_warning)
11636 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11638 /* If this symbol is weak and there is a non-weak definition, we
11639 keep the non-weak definition because many backends put
11640 dynamic reloc info on the non-weak definition for code
11641 handling copy relocs. */
11642 if (h->u.weakdef != NULL)
11643 h->u.weakdef->mark = 1;
11644 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11647 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11648 &cookie->locsyms[r_symndx]);
11651 /* COOKIE->rel describes a relocation against section SEC, which is
11652 a section we've decided to keep. Mark the section that contains
11653 the relocation symbol. */
11656 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11658 elf_gc_mark_hook_fn gc_mark_hook,
11659 struct elf_reloc_cookie *cookie)
11663 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11664 if (rsec && !rsec->gc_mark)
11666 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
11667 || (rsec->owner->flags & DYNAMIC) != 0)
11669 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11675 /* The mark phase of garbage collection. For a given section, mark
11676 it and any sections in this section's group, and all the sections
11677 which define symbols to which it refers. */
11680 _bfd_elf_gc_mark (struct bfd_link_info *info,
11682 elf_gc_mark_hook_fn gc_mark_hook)
11685 asection *group_sec, *eh_frame;
11689 /* Mark all the sections in the group. */
11690 group_sec = elf_section_data (sec)->next_in_group;
11691 if (group_sec && !group_sec->gc_mark)
11692 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11695 /* Look through the section relocs. */
11697 eh_frame = elf_eh_frame_section (sec->owner);
11698 if ((sec->flags & SEC_RELOC) != 0
11699 && sec->reloc_count > 0
11700 && sec != eh_frame)
11702 struct elf_reloc_cookie cookie;
11704 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11708 for (; cookie.rel < cookie.relend; cookie.rel++)
11709 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11714 fini_reloc_cookie_for_section (&cookie, sec);
11718 if (ret && eh_frame && elf_fde_list (sec))
11720 struct elf_reloc_cookie cookie;
11722 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11726 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11727 gc_mark_hook, &cookie))
11729 fini_reloc_cookie_for_section (&cookie, eh_frame);
11736 /* Keep debug and special sections. */
11739 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
11740 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
11744 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
11747 bfd_boolean some_kept;
11749 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
11752 /* Ensure all linker created sections are kept, and see whether
11753 any other section is already marked. */
11755 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11757 if ((isec->flags & SEC_LINKER_CREATED) != 0)
11759 else if (isec->gc_mark)
11763 /* If no section in this file will be kept, then we can
11764 toss out debug sections. */
11768 /* Keep debug and special sections like .comment when they are
11769 not part of a group, or when we have single-member groups. */
11770 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11771 if ((elf_next_in_group (isec) == NULL
11772 || elf_next_in_group (isec) == isec)
11773 && ((isec->flags & SEC_DEBUGGING) != 0
11774 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0))
11780 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11782 struct elf_gc_sweep_symbol_info
11784 struct bfd_link_info *info;
11785 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
11790 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
11793 && (((h->root.type == bfd_link_hash_defined
11794 || h->root.type == bfd_link_hash_defweak)
11795 && !(h->def_regular
11796 && h->root.u.def.section->gc_mark))
11797 || h->root.type == bfd_link_hash_undefined
11798 || h->root.type == bfd_link_hash_undefweak))
11800 struct elf_gc_sweep_symbol_info *inf;
11802 inf = (struct elf_gc_sweep_symbol_info *) data;
11803 (*inf->hide_symbol) (inf->info, h, TRUE);
11804 h->def_regular = 0;
11805 h->ref_regular = 0;
11806 h->ref_regular_nonweak = 0;
11812 /* The sweep phase of garbage collection. Remove all garbage sections. */
11814 typedef bfd_boolean (*gc_sweep_hook_fn)
11815 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
11818 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
11821 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11822 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
11823 unsigned long section_sym_count;
11824 struct elf_gc_sweep_symbol_info sweep_info;
11826 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11830 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11833 for (o = sub->sections; o != NULL; o = o->next)
11835 /* When any section in a section group is kept, we keep all
11836 sections in the section group. If the first member of
11837 the section group is excluded, we will also exclude the
11839 if (o->flags & SEC_GROUP)
11841 asection *first = elf_next_in_group (o);
11842 o->gc_mark = first->gc_mark;
11848 /* Skip sweeping sections already excluded. */
11849 if (o->flags & SEC_EXCLUDE)
11852 /* Since this is early in the link process, it is simple
11853 to remove a section from the output. */
11854 o->flags |= SEC_EXCLUDE;
11856 if (info->print_gc_sections && o->size != 0)
11857 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
11859 /* But we also have to update some of the relocation
11860 info we collected before. */
11862 && (o->flags & SEC_RELOC) != 0
11863 && o->reloc_count > 0
11864 && !bfd_is_abs_section (o->output_section))
11866 Elf_Internal_Rela *internal_relocs;
11870 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
11871 info->keep_memory);
11872 if (internal_relocs == NULL)
11875 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
11877 if (elf_section_data (o)->relocs != internal_relocs)
11878 free (internal_relocs);
11886 /* Remove the symbols that were in the swept sections from the dynamic
11887 symbol table. GCFIXME: Anyone know how to get them out of the
11888 static symbol table as well? */
11889 sweep_info.info = info;
11890 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
11891 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
11894 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
11898 /* Propagate collected vtable information. This is called through
11899 elf_link_hash_traverse. */
11902 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
11904 /* Those that are not vtables. */
11905 if (h->vtable == NULL || h->vtable->parent == NULL)
11908 /* Those vtables that do not have parents, we cannot merge. */
11909 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
11912 /* If we've already been done, exit. */
11913 if (h->vtable->used && h->vtable->used[-1])
11916 /* Make sure the parent's table is up to date. */
11917 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
11919 if (h->vtable->used == NULL)
11921 /* None of this table's entries were referenced. Re-use the
11923 h->vtable->used = h->vtable->parent->vtable->used;
11924 h->vtable->size = h->vtable->parent->vtable->size;
11929 bfd_boolean *cu, *pu;
11931 /* Or the parent's entries into ours. */
11932 cu = h->vtable->used;
11934 pu = h->vtable->parent->vtable->used;
11937 const struct elf_backend_data *bed;
11938 unsigned int log_file_align;
11940 bed = get_elf_backend_data (h->root.u.def.section->owner);
11941 log_file_align = bed->s->log_file_align;
11942 n = h->vtable->parent->vtable->size >> log_file_align;
11957 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
11960 bfd_vma hstart, hend;
11961 Elf_Internal_Rela *relstart, *relend, *rel;
11962 const struct elf_backend_data *bed;
11963 unsigned int log_file_align;
11965 /* Take care of both those symbols that do not describe vtables as
11966 well as those that are not loaded. */
11967 if (h->vtable == NULL || h->vtable->parent == NULL)
11970 BFD_ASSERT (h->root.type == bfd_link_hash_defined
11971 || h->root.type == bfd_link_hash_defweak);
11973 sec = h->root.u.def.section;
11974 hstart = h->root.u.def.value;
11975 hend = hstart + h->size;
11977 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
11979 return *(bfd_boolean *) okp = FALSE;
11980 bed = get_elf_backend_data (sec->owner);
11981 log_file_align = bed->s->log_file_align;
11983 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
11985 for (rel = relstart; rel < relend; ++rel)
11986 if (rel->r_offset >= hstart && rel->r_offset < hend)
11988 /* If the entry is in use, do nothing. */
11989 if (h->vtable->used
11990 && (rel->r_offset - hstart) < h->vtable->size)
11992 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
11993 if (h->vtable->used[entry])
11996 /* Otherwise, kill it. */
11997 rel->r_offset = rel->r_info = rel->r_addend = 0;
12003 /* Mark sections containing dynamically referenced symbols. When
12004 building shared libraries, we must assume that any visible symbol is
12008 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12010 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12012 if ((h->root.type == bfd_link_hash_defined
12013 || h->root.type == bfd_link_hash_defweak)
12015 || ((!info->executable || info->export_dynamic)
12017 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12018 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12019 && (strchr (h->root.root.string, ELF_VER_CHR) != NULL
12020 || !bfd_hide_sym_by_version (info->version_info,
12021 h->root.root.string)))))
12022 h->root.u.def.section->flags |= SEC_KEEP;
12027 /* Keep all sections containing symbols undefined on the command-line,
12028 and the section containing the entry symbol. */
12031 _bfd_elf_gc_keep (struct bfd_link_info *info)
12033 struct bfd_sym_chain *sym;
12035 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12037 struct elf_link_hash_entry *h;
12039 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12040 FALSE, FALSE, FALSE);
12043 && (h->root.type == bfd_link_hash_defined
12044 || h->root.type == bfd_link_hash_defweak)
12045 && !bfd_is_abs_section (h->root.u.def.section))
12046 h->root.u.def.section->flags |= SEC_KEEP;
12050 /* Do mark and sweep of unused sections. */
12053 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12055 bfd_boolean ok = TRUE;
12057 elf_gc_mark_hook_fn gc_mark_hook;
12058 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12060 if (!bed->can_gc_sections
12061 || !is_elf_hash_table (info->hash))
12063 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12067 bed->gc_keep (info);
12069 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12070 at the .eh_frame section if we can mark the FDEs individually. */
12071 _bfd_elf_begin_eh_frame_parsing (info);
12072 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
12075 struct elf_reloc_cookie cookie;
12077 sec = bfd_get_section_by_name (sub, ".eh_frame");
12078 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12080 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12081 if (elf_section_data (sec)->sec_info
12082 && (sec->flags & SEC_LINKER_CREATED) == 0)
12083 elf_eh_frame_section (sub) = sec;
12084 fini_reloc_cookie_for_section (&cookie, sec);
12085 sec = bfd_get_next_section_by_name (sec);
12088 _bfd_elf_end_eh_frame_parsing (info);
12090 /* Apply transitive closure to the vtable entry usage info. */
12091 elf_link_hash_traverse (elf_hash_table (info),
12092 elf_gc_propagate_vtable_entries_used,
12097 /* Kill the vtable relocations that were not used. */
12098 elf_link_hash_traverse (elf_hash_table (info),
12099 elf_gc_smash_unused_vtentry_relocs,
12104 /* Mark dynamically referenced symbols. */
12105 if (elf_hash_table (info)->dynamic_sections_created)
12106 elf_link_hash_traverse (elf_hash_table (info),
12107 bed->gc_mark_dynamic_ref,
12110 /* Grovel through relocs to find out who stays ... */
12111 gc_mark_hook = bed->gc_mark_hook;
12112 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
12116 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12119 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12120 Also treat note sections as a root, if the section is not part
12122 for (o = sub->sections; o != NULL; o = o->next)
12124 && (o->flags & SEC_EXCLUDE) == 0
12125 && ((o->flags & SEC_KEEP) != 0
12126 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12127 && elf_next_in_group (o) == NULL )))
12129 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12134 /* Allow the backend to mark additional target specific sections. */
12135 bed->gc_mark_extra_sections (info, gc_mark_hook);
12137 /* ... and mark SEC_EXCLUDE for those that go. */
12138 return elf_gc_sweep (abfd, info);
12141 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12144 bfd_elf_gc_record_vtinherit (bfd *abfd,
12146 struct elf_link_hash_entry *h,
12149 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12150 struct elf_link_hash_entry **search, *child;
12151 bfd_size_type extsymcount;
12152 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12154 /* The sh_info field of the symtab header tells us where the
12155 external symbols start. We don't care about the local symbols at
12157 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12158 if (!elf_bad_symtab (abfd))
12159 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12161 sym_hashes = elf_sym_hashes (abfd);
12162 sym_hashes_end = sym_hashes + extsymcount;
12164 /* Hunt down the child symbol, which is in this section at the same
12165 offset as the relocation. */
12166 for (search = sym_hashes; search != sym_hashes_end; ++search)
12168 if ((child = *search) != NULL
12169 && (child->root.type == bfd_link_hash_defined
12170 || child->root.type == bfd_link_hash_defweak)
12171 && child->root.u.def.section == sec
12172 && child->root.u.def.value == offset)
12176 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12177 abfd, sec, (unsigned long) offset);
12178 bfd_set_error (bfd_error_invalid_operation);
12182 if (!child->vtable)
12184 child->vtable = (struct elf_link_virtual_table_entry *)
12185 bfd_zalloc (abfd, sizeof (*child->vtable));
12186 if (!child->vtable)
12191 /* This *should* only be the absolute section. It could potentially
12192 be that someone has defined a non-global vtable though, which
12193 would be bad. It isn't worth paging in the local symbols to be
12194 sure though; that case should simply be handled by the assembler. */
12196 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12199 child->vtable->parent = h;
12204 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12207 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12208 asection *sec ATTRIBUTE_UNUSED,
12209 struct elf_link_hash_entry *h,
12212 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12213 unsigned int log_file_align = bed->s->log_file_align;
12217 h->vtable = (struct elf_link_virtual_table_entry *)
12218 bfd_zalloc (abfd, sizeof (*h->vtable));
12223 if (addend >= h->vtable->size)
12225 size_t size, bytes, file_align;
12226 bfd_boolean *ptr = h->vtable->used;
12228 /* While the symbol is undefined, we have to be prepared to handle
12230 file_align = 1 << log_file_align;
12231 if (h->root.type == bfd_link_hash_undefined)
12232 size = addend + file_align;
12236 if (addend >= size)
12238 /* Oops! We've got a reference past the defined end of
12239 the table. This is probably a bug -- shall we warn? */
12240 size = addend + file_align;
12243 size = (size + file_align - 1) & -file_align;
12245 /* Allocate one extra entry for use as a "done" flag for the
12246 consolidation pass. */
12247 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12251 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12257 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12258 * sizeof (bfd_boolean));
12259 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12263 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12268 /* And arrange for that done flag to be at index -1. */
12269 h->vtable->used = ptr + 1;
12270 h->vtable->size = size;
12273 h->vtable->used[addend >> log_file_align] = TRUE;
12278 /* Map an ELF section header flag to its corresponding string. */
12282 flagword flag_value;
12283 } elf_flags_to_name_table;
12285 static elf_flags_to_name_table elf_flags_to_names [] =
12287 { "SHF_WRITE", SHF_WRITE },
12288 { "SHF_ALLOC", SHF_ALLOC },
12289 { "SHF_EXECINSTR", SHF_EXECINSTR },
12290 { "SHF_MERGE", SHF_MERGE },
12291 { "SHF_STRINGS", SHF_STRINGS },
12292 { "SHF_INFO_LINK", SHF_INFO_LINK},
12293 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
12294 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
12295 { "SHF_GROUP", SHF_GROUP },
12296 { "SHF_TLS", SHF_TLS },
12297 { "SHF_MASKOS", SHF_MASKOS },
12298 { "SHF_EXCLUDE", SHF_EXCLUDE },
12301 /* Returns TRUE if the section is to be included, otherwise FALSE. */
12303 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
12304 struct flag_info *flaginfo,
12307 const bfd_vma sh_flags = elf_section_flags (section);
12309 if (!flaginfo->flags_initialized)
12311 bfd *obfd = info->output_bfd;
12312 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12313 struct flag_info_list *tf = flaginfo->flag_list;
12315 int without_hex = 0;
12317 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
12320 flagword (*lookup) (char *);
12322 lookup = bed->elf_backend_lookup_section_flags_hook;
12323 if (lookup != NULL)
12325 flagword hexval = (*lookup) ((char *) tf->name);
12329 if (tf->with == with_flags)
12330 with_hex |= hexval;
12331 else if (tf->with == without_flags)
12332 without_hex |= hexval;
12337 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
12339 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
12341 if (tf->with == with_flags)
12342 with_hex |= elf_flags_to_names[i].flag_value;
12343 else if (tf->with == without_flags)
12344 without_hex |= elf_flags_to_names[i].flag_value;
12351 info->callbacks->einfo
12352 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
12356 flaginfo->flags_initialized = TRUE;
12357 flaginfo->only_with_flags |= with_hex;
12358 flaginfo->not_with_flags |= without_hex;
12361 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
12364 if ((flaginfo->not_with_flags & sh_flags) != 0)
12370 struct alloc_got_off_arg {
12372 struct bfd_link_info *info;
12375 /* We need a special top-level link routine to convert got reference counts
12376 to real got offsets. */
12379 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12381 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12382 bfd *obfd = gofarg->info->output_bfd;
12383 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12385 if (h->got.refcount > 0)
12387 h->got.offset = gofarg->gotoff;
12388 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12391 h->got.offset = (bfd_vma) -1;
12396 /* And an accompanying bit to work out final got entry offsets once
12397 we're done. Should be called from final_link. */
12400 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12401 struct bfd_link_info *info)
12404 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12406 struct alloc_got_off_arg gofarg;
12408 BFD_ASSERT (abfd == info->output_bfd);
12410 if (! is_elf_hash_table (info->hash))
12413 /* The GOT offset is relative to the .got section, but the GOT header is
12414 put into the .got.plt section, if the backend uses it. */
12415 if (bed->want_got_plt)
12418 gotoff = bed->got_header_size;
12420 /* Do the local .got entries first. */
12421 for (i = info->input_bfds; i; i = i->link_next)
12423 bfd_signed_vma *local_got;
12424 bfd_size_type j, locsymcount;
12425 Elf_Internal_Shdr *symtab_hdr;
12427 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12430 local_got = elf_local_got_refcounts (i);
12434 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12435 if (elf_bad_symtab (i))
12436 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12438 locsymcount = symtab_hdr->sh_info;
12440 for (j = 0; j < locsymcount; ++j)
12442 if (local_got[j] > 0)
12444 local_got[j] = gotoff;
12445 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12448 local_got[j] = (bfd_vma) -1;
12452 /* Then the global .got entries. .plt refcounts are handled by
12453 adjust_dynamic_symbol */
12454 gofarg.gotoff = gotoff;
12455 gofarg.info = info;
12456 elf_link_hash_traverse (elf_hash_table (info),
12457 elf_gc_allocate_got_offsets,
12462 /* Many folk need no more in the way of final link than this, once
12463 got entry reference counting is enabled. */
12466 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12468 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12471 /* Invoke the regular ELF backend linker to do all the work. */
12472 return bfd_elf_final_link (abfd, info);
12476 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12478 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12480 if (rcookie->bad_symtab)
12481 rcookie->rel = rcookie->rels;
12483 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12485 unsigned long r_symndx;
12487 if (! rcookie->bad_symtab)
12488 if (rcookie->rel->r_offset > offset)
12490 if (rcookie->rel->r_offset != offset)
12493 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12494 if (r_symndx == STN_UNDEF)
12497 if (r_symndx >= rcookie->locsymcount
12498 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12500 struct elf_link_hash_entry *h;
12502 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12504 while (h->root.type == bfd_link_hash_indirect
12505 || h->root.type == bfd_link_hash_warning)
12506 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12508 if ((h->root.type == bfd_link_hash_defined
12509 || h->root.type == bfd_link_hash_defweak)
12510 && discarded_section (h->root.u.def.section))
12517 /* It's not a relocation against a global symbol,
12518 but it could be a relocation against a local
12519 symbol for a discarded section. */
12521 Elf_Internal_Sym *isym;
12523 /* Need to: get the symbol; get the section. */
12524 isym = &rcookie->locsyms[r_symndx];
12525 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12526 if (isec != NULL && discarded_section (isec))
12534 /* Discard unneeded references to discarded sections.
12535 Returns TRUE if any section's size was changed. */
12536 /* This function assumes that the relocations are in sorted order,
12537 which is true for all known assemblers. */
12540 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12542 struct elf_reloc_cookie cookie;
12543 asection *stab, *eh;
12544 const struct elf_backend_data *bed;
12546 bfd_boolean ret = FALSE;
12548 if (info->traditional_format
12549 || !is_elf_hash_table (info->hash))
12552 _bfd_elf_begin_eh_frame_parsing (info);
12553 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
12555 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12558 bed = get_elf_backend_data (abfd);
12561 if (!info->relocatable)
12563 eh = bfd_get_section_by_name (abfd, ".eh_frame");
12566 || bfd_is_abs_section (eh->output_section)))
12567 eh = bfd_get_next_section_by_name (eh);
12570 stab = bfd_get_section_by_name (abfd, ".stab");
12572 && (stab->size == 0
12573 || bfd_is_abs_section (stab->output_section)
12574 || stab->sec_info_type != SEC_INFO_TYPE_STABS))
12579 && bed->elf_backend_discard_info == NULL)
12582 if (!init_reloc_cookie (&cookie, info, abfd))
12586 && stab->reloc_count > 0
12587 && init_reloc_cookie_rels (&cookie, info, abfd, stab))
12589 if (_bfd_discard_section_stabs (abfd, stab,
12590 elf_section_data (stab)->sec_info,
12591 bfd_elf_reloc_symbol_deleted_p,
12594 fini_reloc_cookie_rels (&cookie, stab);
12598 && init_reloc_cookie_rels (&cookie, info, abfd, eh))
12600 _bfd_elf_parse_eh_frame (abfd, info, eh, &cookie);
12601 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
12602 bfd_elf_reloc_symbol_deleted_p,
12605 fini_reloc_cookie_rels (&cookie, eh);
12606 eh = bfd_get_next_section_by_name (eh);
12609 if (bed->elf_backend_discard_info != NULL
12610 && (*bed->elf_backend_discard_info) (abfd, &cookie, info))
12613 fini_reloc_cookie (&cookie, abfd);
12615 _bfd_elf_end_eh_frame_parsing (info);
12617 if (info->eh_frame_hdr
12618 && !info->relocatable
12619 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12626 _bfd_elf_section_already_linked (bfd *abfd,
12628 struct bfd_link_info *info)
12631 const char *name, *key;
12632 struct bfd_section_already_linked *l;
12633 struct bfd_section_already_linked_hash_entry *already_linked_list;
12635 if (sec->output_section == bfd_abs_section_ptr)
12638 flags = sec->flags;
12640 /* Return if it isn't a linkonce section. A comdat group section
12641 also has SEC_LINK_ONCE set. */
12642 if ((flags & SEC_LINK_ONCE) == 0)
12645 /* Don't put group member sections on our list of already linked
12646 sections. They are handled as a group via their group section. */
12647 if (elf_sec_group (sec) != NULL)
12650 /* For a SHT_GROUP section, use the group signature as the key. */
12652 if ((flags & SEC_GROUP) != 0
12653 && elf_next_in_group (sec) != NULL
12654 && elf_group_name (elf_next_in_group (sec)) != NULL)
12655 key = elf_group_name (elf_next_in_group (sec));
12658 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
12659 if (CONST_STRNEQ (name, ".gnu.linkonce.")
12660 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
12663 /* Must be a user linkonce section that doesn't follow gcc's
12664 naming convention. In this case we won't be matching
12665 single member groups. */
12669 already_linked_list = bfd_section_already_linked_table_lookup (key);
12671 for (l = already_linked_list->entry; l != NULL; l = l->next)
12673 /* We may have 2 different types of sections on the list: group
12674 sections with a signature of <key> (<key> is some string),
12675 and linkonce sections named .gnu.linkonce.<type>.<key>.
12676 Match like sections. LTO plugin sections are an exception.
12677 They are always named .gnu.linkonce.t.<key> and match either
12678 type of section. */
12679 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
12680 && ((flags & SEC_GROUP) != 0
12681 || strcmp (name, l->sec->name) == 0))
12682 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
12684 /* The section has already been linked. See if we should
12685 issue a warning. */
12686 if (!_bfd_handle_already_linked (sec, l, info))
12689 if (flags & SEC_GROUP)
12691 asection *first = elf_next_in_group (sec);
12692 asection *s = first;
12696 s->output_section = bfd_abs_section_ptr;
12697 /* Record which group discards it. */
12698 s->kept_section = l->sec;
12699 s = elf_next_in_group (s);
12700 /* These lists are circular. */
12710 /* A single member comdat group section may be discarded by a
12711 linkonce section and vice versa. */
12712 if ((flags & SEC_GROUP) != 0)
12714 asection *first = elf_next_in_group (sec);
12716 if (first != NULL && elf_next_in_group (first) == first)
12717 /* Check this single member group against linkonce sections. */
12718 for (l = already_linked_list->entry; l != NULL; l = l->next)
12719 if ((l->sec->flags & SEC_GROUP) == 0
12720 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
12722 first->output_section = bfd_abs_section_ptr;
12723 first->kept_section = l->sec;
12724 sec->output_section = bfd_abs_section_ptr;
12729 /* Check this linkonce section against single member groups. */
12730 for (l = already_linked_list->entry; l != NULL; l = l->next)
12731 if (l->sec->flags & SEC_GROUP)
12733 asection *first = elf_next_in_group (l->sec);
12736 && elf_next_in_group (first) == first
12737 && bfd_elf_match_symbols_in_sections (first, sec, info))
12739 sec->output_section = bfd_abs_section_ptr;
12740 sec->kept_section = first;
12745 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12746 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12747 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12748 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12749 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12750 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12751 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12752 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12753 The reverse order cannot happen as there is never a bfd with only the
12754 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12755 matter as here were are looking only for cross-bfd sections. */
12757 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
12758 for (l = already_linked_list->entry; l != NULL; l = l->next)
12759 if ((l->sec->flags & SEC_GROUP) == 0
12760 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
12762 if (abfd != l->sec->owner)
12763 sec->output_section = bfd_abs_section_ptr;
12767 /* This is the first section with this name. Record it. */
12768 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
12769 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
12770 return sec->output_section == bfd_abs_section_ptr;
12774 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
12776 return sym->st_shndx == SHN_COMMON;
12780 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
12786 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
12788 return bfd_com_section_ptr;
12792 _bfd_elf_default_got_elt_size (bfd *abfd,
12793 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12794 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
12795 bfd *ibfd ATTRIBUTE_UNUSED,
12796 unsigned long symndx ATTRIBUTE_UNUSED)
12798 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12799 return bed->s->arch_size / 8;
12802 /* Routines to support the creation of dynamic relocs. */
12804 /* Returns the name of the dynamic reloc section associated with SEC. */
12806 static const char *
12807 get_dynamic_reloc_section_name (bfd * abfd,
12809 bfd_boolean is_rela)
12812 const char *old_name = bfd_get_section_name (NULL, sec);
12813 const char *prefix = is_rela ? ".rela" : ".rel";
12815 if (old_name == NULL)
12818 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
12819 sprintf (name, "%s%s", prefix, old_name);
12824 /* Returns the dynamic reloc section associated with SEC.
12825 If necessary compute the name of the dynamic reloc section based
12826 on SEC's name (looked up in ABFD's string table) and the setting
12830 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
12832 bfd_boolean is_rela)
12834 asection * reloc_sec = elf_section_data (sec)->sreloc;
12836 if (reloc_sec == NULL)
12838 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12842 reloc_sec = bfd_get_linker_section (abfd, name);
12844 if (reloc_sec != NULL)
12845 elf_section_data (sec)->sreloc = reloc_sec;
12852 /* Returns the dynamic reloc section associated with SEC. If the
12853 section does not exist it is created and attached to the DYNOBJ
12854 bfd and stored in the SRELOC field of SEC's elf_section_data
12857 ALIGNMENT is the alignment for the newly created section and
12858 IS_RELA defines whether the name should be .rela.<SEC's name>
12859 or .rel.<SEC's name>. The section name is looked up in the
12860 string table associated with ABFD. */
12863 _bfd_elf_make_dynamic_reloc_section (asection * sec,
12865 unsigned int alignment,
12867 bfd_boolean is_rela)
12869 asection * reloc_sec = elf_section_data (sec)->sreloc;
12871 if (reloc_sec == NULL)
12873 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12878 reloc_sec = bfd_get_linker_section (dynobj, name);
12880 if (reloc_sec == NULL)
12882 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
12883 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
12884 if ((sec->flags & SEC_ALLOC) != 0)
12885 flags |= SEC_ALLOC | SEC_LOAD;
12887 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
12888 if (reloc_sec != NULL)
12890 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
12895 elf_section_data (sec)->sreloc = reloc_sec;
12901 /* Copy the ELF symbol type associated with a linker hash entry. */
12903 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd ATTRIBUTE_UNUSED,
12904 struct bfd_link_hash_entry * hdest,
12905 struct bfd_link_hash_entry * hsrc)
12907 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *)hdest;
12908 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *)hsrc;
12910 ehdest->type = ehsrc->type;
12911 ehdest->target_internal = ehsrc->target_internal;
12914 /* Append a RELA relocation REL to section S in BFD. */
12917 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
12919 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12920 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
12921 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
12922 bed->s->swap_reloca_out (abfd, rel, loc);
12925 /* Append a REL relocation REL to section S in BFD. */
12928 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
12930 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12931 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
12932 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
12933 bed->s->swap_reloca_out (abfd, rel, loc);