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, 2013
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;
190 struct elf_link_hash_entry *h;
192 if (! is_elf_hash_table (info->hash))
195 if (elf_hash_table (info)->dynamic_sections_created)
198 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
201 abfd = elf_hash_table (info)->dynobj;
202 bed = get_elf_backend_data (abfd);
204 flags = bed->dynamic_sec_flags;
206 /* A dynamically linked executable has a .interp section, but a
207 shared library does not. */
208 if (info->executable)
210 s = bfd_make_section_anyway_with_flags (abfd, ".interp",
211 flags | SEC_READONLY);
216 /* Create sections to hold version informations. These are removed
217 if they are not needed. */
218 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d",
219 flags | SEC_READONLY);
221 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
224 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version",
225 flags | SEC_READONLY);
227 || ! bfd_set_section_alignment (abfd, s, 1))
230 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r",
231 flags | SEC_READONLY);
233 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
236 s = bfd_make_section_anyway_with_flags (abfd, ".dynsym",
237 flags | SEC_READONLY);
239 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
242 s = bfd_make_section_anyway_with_flags (abfd, ".dynstr",
243 flags | SEC_READONLY);
247 s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags);
249 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
252 /* The special symbol _DYNAMIC is always set to the start of the
253 .dynamic section. We could set _DYNAMIC in a linker script, but we
254 only want to define it if we are, in fact, creating a .dynamic
255 section. We don't want to define it if there is no .dynamic
256 section, since on some ELF platforms the start up code examines it
257 to decide how to initialize the process. */
258 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC");
259 elf_hash_table (info)->hdynamic = h;
265 s = bfd_make_section_anyway_with_flags (abfd, ".hash",
266 flags | SEC_READONLY);
268 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
270 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
273 if (info->emit_gnu_hash)
275 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
276 flags | SEC_READONLY);
278 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
280 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
281 4 32-bit words followed by variable count of 64-bit words, then
282 variable count of 32-bit words. */
283 if (bed->s->arch_size == 64)
284 elf_section_data (s)->this_hdr.sh_entsize = 0;
286 elf_section_data (s)->this_hdr.sh_entsize = 4;
289 /* Let the backend create the rest of the sections. This lets the
290 backend set the right flags. The backend will normally create
291 the .got and .plt sections. */
292 if (bed->elf_backend_create_dynamic_sections == NULL
293 || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
296 elf_hash_table (info)->dynamic_sections_created = TRUE;
301 /* Create dynamic sections when linking against a dynamic object. */
304 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
306 flagword flags, pltflags;
307 struct elf_link_hash_entry *h;
309 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
310 struct elf_link_hash_table *htab = elf_hash_table (info);
312 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
313 .rel[a].bss sections. */
314 flags = bed->dynamic_sec_flags;
317 if (bed->plt_not_loaded)
318 /* We do not clear SEC_ALLOC here because we still want the OS to
319 allocate space for the section; it's just that there's nothing
320 to read in from the object file. */
321 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
323 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
324 if (bed->plt_readonly)
325 pltflags |= SEC_READONLY;
327 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
329 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
333 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
335 if (bed->want_plt_sym)
337 h = _bfd_elf_define_linkage_sym (abfd, info, s,
338 "_PROCEDURE_LINKAGE_TABLE_");
339 elf_hash_table (info)->hplt = h;
344 s = bfd_make_section_anyway_with_flags (abfd,
345 (bed->rela_plts_and_copies_p
346 ? ".rela.plt" : ".rel.plt"),
347 flags | SEC_READONLY);
349 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
353 if (! _bfd_elf_create_got_section (abfd, info))
356 if (bed->want_dynbss)
358 /* The .dynbss section is a place to put symbols which are defined
359 by dynamic objects, are referenced by regular objects, and are
360 not functions. We must allocate space for them in the process
361 image and use a R_*_COPY reloc to tell the dynamic linker to
362 initialize them at run time. The linker script puts the .dynbss
363 section into the .bss section of the final image. */
364 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
365 (SEC_ALLOC | SEC_LINKER_CREATED));
369 /* The .rel[a].bss section holds copy relocs. This section is not
370 normally needed. We need to create it here, though, so that the
371 linker will map it to an output section. We can't just create it
372 only if we need it, because we will not know whether we need it
373 until we have seen all the input files, and the first time the
374 main linker code calls BFD after examining all the input files
375 (size_dynamic_sections) the input sections have already been
376 mapped to the output sections. If the section turns out not to
377 be needed, we can discard it later. We will never need this
378 section when generating a shared object, since they do not use
382 s = bfd_make_section_anyway_with_flags (abfd,
383 (bed->rela_plts_and_copies_p
384 ? ".rela.bss" : ".rel.bss"),
385 flags | SEC_READONLY);
387 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
395 /* Record a new dynamic symbol. We record the dynamic symbols as we
396 read the input files, since we need to have a list of all of them
397 before we can determine the final sizes of the output sections.
398 Note that we may actually call this function even though we are not
399 going to output any dynamic symbols; in some cases we know that a
400 symbol should be in the dynamic symbol table, but only if there is
404 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
405 struct elf_link_hash_entry *h)
407 if (h->dynindx == -1)
409 struct elf_strtab_hash *dynstr;
414 /* XXX: The ABI draft says the linker must turn hidden and
415 internal symbols into STB_LOCAL symbols when producing the
416 DSO. However, if ld.so honors st_other in the dynamic table,
417 this would not be necessary. */
418 switch (ELF_ST_VISIBILITY (h->other))
422 if (h->root.type != bfd_link_hash_undefined
423 && h->root.type != bfd_link_hash_undefweak)
426 if (!elf_hash_table (info)->is_relocatable_executable)
434 h->dynindx = elf_hash_table (info)->dynsymcount;
435 ++elf_hash_table (info)->dynsymcount;
437 dynstr = elf_hash_table (info)->dynstr;
440 /* Create a strtab to hold the dynamic symbol names. */
441 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
446 /* We don't put any version information in the dynamic string
448 name = h->root.root.string;
449 p = strchr (name, ELF_VER_CHR);
451 /* We know that the p points into writable memory. In fact,
452 there are only a few symbols that have read-only names, being
453 those like _GLOBAL_OFFSET_TABLE_ that are created specially
454 by the backends. Most symbols will have names pointing into
455 an ELF string table read from a file, or to objalloc memory. */
458 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
463 if (indx == (bfd_size_type) -1)
465 h->dynstr_index = indx;
471 /* Mark a symbol dynamic. */
474 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
475 struct elf_link_hash_entry *h,
476 Elf_Internal_Sym *sym)
478 struct bfd_elf_dynamic_list *d = info->dynamic_list;
480 /* It may be called more than once on the same H. */
481 if(h->dynamic || info->relocatable)
484 if ((info->dynamic_data
485 && (h->type == STT_OBJECT
487 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
489 && h->root.type == bfd_link_hash_new
490 && (*d->match) (&d->head, NULL, h->root.root.string)))
494 /* Record an assignment to a symbol made by a linker script. We need
495 this in case some dynamic object refers to this symbol. */
498 bfd_elf_record_link_assignment (bfd *output_bfd,
499 struct bfd_link_info *info,
504 struct elf_link_hash_entry *h, *hv;
505 struct elf_link_hash_table *htab;
506 const struct elf_backend_data *bed;
508 if (!is_elf_hash_table (info->hash))
511 htab = elf_hash_table (info);
512 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
516 switch (h->root.type)
518 case bfd_link_hash_defined:
519 case bfd_link_hash_defweak:
520 case bfd_link_hash_common:
522 case bfd_link_hash_undefweak:
523 case bfd_link_hash_undefined:
524 /* Since we're defining the symbol, don't let it seem to have not
525 been defined. record_dynamic_symbol and size_dynamic_sections
526 may depend on this. */
527 h->root.type = bfd_link_hash_new;
528 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
529 bfd_link_repair_undef_list (&htab->root);
531 case bfd_link_hash_new:
532 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
535 case bfd_link_hash_indirect:
536 /* We had a versioned symbol in a dynamic library. We make the
537 the versioned symbol point to this one. */
538 bed = get_elf_backend_data (output_bfd);
540 while (hv->root.type == bfd_link_hash_indirect
541 || hv->root.type == bfd_link_hash_warning)
542 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
543 /* We don't need to update h->root.u since linker will set them
545 h->root.type = bfd_link_hash_undefined;
546 hv->root.type = bfd_link_hash_indirect;
547 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
548 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
550 case bfd_link_hash_warning:
555 /* If this symbol is being provided by the linker script, and it is
556 currently defined by a dynamic object, but not by a regular
557 object, then mark it as undefined so that the generic linker will
558 force the correct value. */
562 h->root.type = bfd_link_hash_undefined;
564 /* If this symbol is not being provided by the linker script, and it is
565 currently defined by a dynamic object, but not by a regular object,
566 then clear out any version information because the symbol will not be
567 associated with the dynamic object any more. */
571 h->verinfo.verdef = NULL;
577 bed = get_elf_backend_data (output_bfd);
578 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
579 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
582 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
584 if (!info->relocatable
586 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
587 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
593 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
596 if (! bfd_elf_link_record_dynamic_symbol (info, h))
599 /* If this is a weak defined symbol, and we know a corresponding
600 real symbol from the same dynamic object, make sure the real
601 symbol is also made into a dynamic symbol. */
602 if (h->u.weakdef != NULL
603 && h->u.weakdef->dynindx == -1)
605 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
613 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
614 success, and 2 on a failure caused by attempting to record a symbol
615 in a discarded section, eg. a discarded link-once section symbol. */
618 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
623 struct elf_link_local_dynamic_entry *entry;
624 struct elf_link_hash_table *eht;
625 struct elf_strtab_hash *dynstr;
626 unsigned long dynstr_index;
628 Elf_External_Sym_Shndx eshndx;
629 char esym[sizeof (Elf64_External_Sym)];
631 if (! is_elf_hash_table (info->hash))
634 /* See if the entry exists already. */
635 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
636 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
639 amt = sizeof (*entry);
640 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
644 /* Go find the symbol, so that we can find it's name. */
645 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
646 1, input_indx, &entry->isym, esym, &eshndx))
648 bfd_release (input_bfd, entry);
652 if (entry->isym.st_shndx != SHN_UNDEF
653 && entry->isym.st_shndx < SHN_LORESERVE)
657 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
658 if (s == NULL || bfd_is_abs_section (s->output_section))
660 /* We can still bfd_release here as nothing has done another
661 bfd_alloc. We can't do this later in this function. */
662 bfd_release (input_bfd, entry);
667 name = (bfd_elf_string_from_elf_section
668 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
669 entry->isym.st_name));
671 dynstr = elf_hash_table (info)->dynstr;
674 /* Create a strtab to hold the dynamic symbol names. */
675 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
680 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
681 if (dynstr_index == (unsigned long) -1)
683 entry->isym.st_name = dynstr_index;
685 eht = elf_hash_table (info);
687 entry->next = eht->dynlocal;
688 eht->dynlocal = entry;
689 entry->input_bfd = input_bfd;
690 entry->input_indx = input_indx;
693 /* Whatever binding the symbol had before, it's now local. */
695 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
697 /* The dynindx will be set at the end of size_dynamic_sections. */
702 /* Return the dynindex of a local dynamic symbol. */
705 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
709 struct elf_link_local_dynamic_entry *e;
711 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
712 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
717 /* This function is used to renumber the dynamic symbols, if some of
718 them are removed because they are marked as local. This is called
719 via elf_link_hash_traverse. */
722 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
725 size_t *count = (size_t *) data;
730 if (h->dynindx != -1)
731 h->dynindx = ++(*count);
737 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
738 STB_LOCAL binding. */
741 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
744 size_t *count = (size_t *) data;
746 if (!h->forced_local)
749 if (h->dynindx != -1)
750 h->dynindx = ++(*count);
755 /* Return true if the dynamic symbol for a given section should be
756 omitted when creating a shared library. */
758 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
759 struct bfd_link_info *info,
762 struct elf_link_hash_table *htab;
764 switch (elf_section_data (p)->this_hdr.sh_type)
768 /* If sh_type is yet undecided, assume it could be
769 SHT_PROGBITS/SHT_NOBITS. */
771 htab = elf_hash_table (info);
772 if (p == htab->tls_sec)
775 if (htab->text_index_section != NULL)
776 return p != htab->text_index_section && p != htab->data_index_section;
778 if (strcmp (p->name, ".got") == 0
779 || strcmp (p->name, ".got.plt") == 0
780 || strcmp (p->name, ".plt") == 0)
784 if (htab->dynobj != NULL
785 && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
786 && ip->output_section == p)
791 /* There shouldn't be section relative relocations
792 against any other section. */
798 /* Assign dynsym indices. In a shared library we generate a section
799 symbol for each output section, which come first. Next come symbols
800 which have been forced to local binding. Then all of the back-end
801 allocated local dynamic syms, followed by the rest of the global
805 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
806 struct bfd_link_info *info,
807 unsigned long *section_sym_count)
809 unsigned long dynsymcount = 0;
811 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
813 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
815 for (p = output_bfd->sections; p ; p = p->next)
816 if ((p->flags & SEC_EXCLUDE) == 0
817 && (p->flags & SEC_ALLOC) != 0
818 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
819 elf_section_data (p)->dynindx = ++dynsymcount;
821 elf_section_data (p)->dynindx = 0;
823 *section_sym_count = dynsymcount;
825 elf_link_hash_traverse (elf_hash_table (info),
826 elf_link_renumber_local_hash_table_dynsyms,
829 if (elf_hash_table (info)->dynlocal)
831 struct elf_link_local_dynamic_entry *p;
832 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
833 p->dynindx = ++dynsymcount;
836 elf_link_hash_traverse (elf_hash_table (info),
837 elf_link_renumber_hash_table_dynsyms,
840 /* There is an unused NULL entry at the head of the table which
841 we must account for in our count. Unless there weren't any
842 symbols, which means we'll have no table at all. */
843 if (dynsymcount != 0)
846 elf_hash_table (info)->dynsymcount = dynsymcount;
850 /* Merge st_other field. */
853 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
854 Elf_Internal_Sym *isym, bfd_boolean definition,
857 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
859 /* If st_other has a processor-specific meaning, specific
860 code might be needed here. We never merge the visibility
861 attribute with the one from a dynamic object. */
862 if (bed->elf_backend_merge_symbol_attribute)
863 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
866 /* If this symbol has default visibility and the user has requested
867 we not re-export it, then mark it as hidden. */
871 || (abfd->my_archive && abfd->my_archive->no_export))
872 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
873 isym->st_other = (STV_HIDDEN
874 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
876 if (!dynamic && ELF_ST_VISIBILITY (isym->st_other) != 0)
878 unsigned char hvis, symvis, other, nvis;
880 /* Only merge the visibility. Leave the remainder of the
881 st_other field to elf_backend_merge_symbol_attribute. */
882 other = h->other & ~ELF_ST_VISIBILITY (-1);
884 /* Combine visibilities, using the most constraining one. */
885 hvis = ELF_ST_VISIBILITY (h->other);
886 symvis = ELF_ST_VISIBILITY (isym->st_other);
892 nvis = hvis < symvis ? hvis : symvis;
894 h->other = other | nvis;
898 /* This function is called when we want to merge a new symbol with an
899 existing symbol. It handles the various cases which arise when we
900 find a definition in a dynamic object, or when there is already a
901 definition in a dynamic object. The new symbol is described by
902 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
903 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
904 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
905 of an old common symbol. We set OVERRIDE if the old symbol is
906 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
907 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
908 to change. By OK to change, we mean that we shouldn't warn if the
909 type or size does change. */
912 _bfd_elf_merge_symbol (bfd *abfd,
913 struct bfd_link_info *info,
915 Elf_Internal_Sym *sym,
918 struct elf_link_hash_entry **sym_hash,
920 bfd_boolean *pold_weak,
921 unsigned int *pold_alignment,
923 bfd_boolean *override,
924 bfd_boolean *type_change_ok,
925 bfd_boolean *size_change_ok)
927 asection *sec, *oldsec;
928 struct elf_link_hash_entry *h;
929 struct elf_link_hash_entry *hi;
930 struct elf_link_hash_entry *flip;
933 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
934 bfd_boolean newweak, oldweak, newfunc, oldfunc;
935 const struct elf_backend_data *bed;
941 bind = ELF_ST_BIND (sym->st_info);
943 if (! bfd_is_und_section (sec))
944 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
946 h = ((struct elf_link_hash_entry *)
947 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
952 bed = get_elf_backend_data (abfd);
954 /* This code is for coping with dynamic objects, and is only useful
955 if we are doing an ELF link. */
956 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
959 /* For merging, we only care about real symbols. But we need to make
960 sure that indirect symbol dynamic flags are updated. */
962 while (h->root.type == bfd_link_hash_indirect
963 || h->root.type == bfd_link_hash_warning)
964 h = (struct elf_link_hash_entry *) h->root.u.i.link;
966 /* We have to check it for every instance since the first few may be
967 references and not all compilers emit symbol type for undefined
969 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
971 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
972 respectively, is from a dynamic object. */
974 newdyn = (abfd->flags & DYNAMIC) != 0;
976 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
977 syms and defined syms in dynamic libraries respectively.
978 ref_dynamic on the other hand can be set for a symbol defined in
979 a dynamic library, and def_dynamic may not be set; When the
980 definition in a dynamic lib is overridden by a definition in the
981 executable use of the symbol in the dynamic lib becomes a
982 reference to the executable symbol. */
985 if (bfd_is_und_section (sec))
987 if (bind != STB_WEAK)
989 h->ref_dynamic_nonweak = 1;
990 hi->ref_dynamic_nonweak = 1;
1000 /* If we just created the symbol, mark it as being an ELF symbol.
1001 Other than that, there is nothing to do--there is no merge issue
1002 with a newly defined symbol--so we just return. */
1004 if (h->root.type == bfd_link_hash_new)
1010 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1013 switch (h->root.type)
1020 case bfd_link_hash_undefined:
1021 case bfd_link_hash_undefweak:
1022 oldbfd = h->root.u.undef.abfd;
1026 case bfd_link_hash_defined:
1027 case bfd_link_hash_defweak:
1028 oldbfd = h->root.u.def.section->owner;
1029 oldsec = h->root.u.def.section;
1032 case bfd_link_hash_common:
1033 oldbfd = h->root.u.c.p->section->owner;
1034 oldsec = h->root.u.c.p->section;
1036 *pold_alignment = h->root.u.c.p->alignment_power;
1039 if (poldbfd && *poldbfd == NULL)
1042 /* Differentiate strong and weak symbols. */
1043 newweak = bind == STB_WEAK;
1044 oldweak = (h->root.type == bfd_link_hash_defweak
1045 || h->root.type == bfd_link_hash_undefweak);
1047 *pold_weak = oldweak;
1049 /* In cases involving weak versioned symbols, we may wind up trying
1050 to merge a symbol with itself. Catch that here, to avoid the
1051 confusion that results if we try to override a symbol with
1052 itself. The additional tests catch cases like
1053 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1054 dynamic object, which we do want to handle here. */
1056 && (newweak || oldweak)
1057 && ((abfd->flags & DYNAMIC) == 0
1058 || !h->def_regular))
1063 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1064 else if (oldsec != NULL)
1066 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1067 indices used by MIPS ELF. */
1068 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1071 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1072 respectively, appear to be a definition rather than reference. */
1074 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1076 olddef = (h->root.type != bfd_link_hash_undefined
1077 && h->root.type != bfd_link_hash_undefweak
1078 && h->root.type != bfd_link_hash_common);
1080 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1081 respectively, appear to be a function. */
1083 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1084 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1086 oldfunc = (h->type != STT_NOTYPE
1087 && bed->is_function_type (h->type));
1089 /* When we try to create a default indirect symbol from the dynamic
1090 definition with the default version, we skip it if its type and
1091 the type of existing regular definition mismatch. We only do it
1092 if the existing regular definition won't be dynamic. */
1093 if (pold_alignment == NULL
1095 && !info->export_dynamic
1100 && (olddef || h->root.type == bfd_link_hash_common)
1101 && ELF_ST_TYPE (sym->st_info) != h->type
1102 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1103 && h->type != STT_NOTYPE
1104 && !(newfunc && oldfunc))
1110 /* Plugin symbol type isn't currently set. Stop bogus errors. */
1111 if (oldbfd != NULL && (oldbfd->flags & BFD_PLUGIN) != 0)
1112 *type_change_ok = TRUE;
1114 /* Check TLS symbol. We don't check undefined symbol introduced by
1116 else if (oldbfd != NULL
1117 && ELF_ST_TYPE (sym->st_info) != h->type
1118 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1121 bfd_boolean ntdef, tdef;
1122 asection *ntsec, *tsec;
1124 if (h->type == STT_TLS)
1144 (*_bfd_error_handler)
1145 (_("%s: TLS definition in %B section %A "
1146 "mismatches non-TLS definition in %B section %A"),
1147 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1148 else if (!tdef && !ntdef)
1149 (*_bfd_error_handler)
1150 (_("%s: TLS reference in %B "
1151 "mismatches non-TLS reference in %B"),
1152 tbfd, ntbfd, h->root.root.string);
1154 (*_bfd_error_handler)
1155 (_("%s: TLS definition in %B section %A "
1156 "mismatches non-TLS reference in %B"),
1157 tbfd, tsec, ntbfd, h->root.root.string);
1159 (*_bfd_error_handler)
1160 (_("%s: TLS reference in %B "
1161 "mismatches non-TLS definition in %B section %A"),
1162 tbfd, ntbfd, ntsec, h->root.root.string);
1164 bfd_set_error (bfd_error_bad_value);
1168 /* If the old symbol has non-default visibility, we ignore the new
1169 definition from a dynamic object. */
1171 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1172 && !bfd_is_und_section (sec))
1175 /* Make sure this symbol is dynamic. */
1177 hi->ref_dynamic = 1;
1178 /* A protected symbol has external availability. Make sure it is
1179 recorded as dynamic.
1181 FIXME: Should we check type and size for protected symbol? */
1182 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1183 return bfd_elf_link_record_dynamic_symbol (info, h);
1188 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1191 /* If the new symbol with non-default visibility comes from a
1192 relocatable file and the old definition comes from a dynamic
1193 object, we remove the old definition. */
1194 if (hi->root.type == bfd_link_hash_indirect)
1196 /* Handle the case where the old dynamic definition is
1197 default versioned. We need to copy the symbol info from
1198 the symbol with default version to the normal one if it
1199 was referenced before. */
1202 hi->root.type = h->root.type;
1203 h->root.type = bfd_link_hash_indirect;
1204 (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
1206 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1207 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1209 /* If the new symbol is hidden or internal, completely undo
1210 any dynamic link state. */
1211 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1212 h->forced_local = 0;
1219 /* FIXME: Should we check type and size for protected symbol? */
1229 /* If the old symbol was undefined before, then it will still be
1230 on the undefs list. If the new symbol is undefined or
1231 common, we can't make it bfd_link_hash_new here, because new
1232 undefined or common symbols will be added to the undefs list
1233 by _bfd_generic_link_add_one_symbol. Symbols may not be
1234 added twice to the undefs list. Also, if the new symbol is
1235 undefweak then we don't want to lose the strong undef. */
1236 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1238 h->root.type = bfd_link_hash_undefined;
1239 h->root.u.undef.abfd = abfd;
1243 h->root.type = bfd_link_hash_new;
1244 h->root.u.undef.abfd = NULL;
1247 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1249 /* If the new symbol is hidden or internal, completely undo
1250 any dynamic link state. */
1251 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1252 h->forced_local = 0;
1258 /* FIXME: Should we check type and size for protected symbol? */
1264 /* If a new weak symbol definition comes from a regular file and the
1265 old symbol comes from a dynamic library, we treat the new one as
1266 strong. Similarly, an old weak symbol definition from a regular
1267 file is treated as strong when the new symbol comes from a dynamic
1268 library. Further, an old weak symbol from a dynamic library is
1269 treated as strong if the new symbol is from a dynamic library.
1270 This reflects the way glibc's ld.so works.
1272 Do this before setting *type_change_ok or *size_change_ok so that
1273 we warn properly when dynamic library symbols are overridden. */
1275 if (newdef && !newdyn && olddyn)
1277 if (olddef && newdyn)
1280 /* Allow changes between different types of function symbol. */
1281 if (newfunc && oldfunc)
1282 *type_change_ok = TRUE;
1284 /* It's OK to change the type if either the existing symbol or the
1285 new symbol is weak. A type change is also OK if the old symbol
1286 is undefined and the new symbol is defined. */
1291 && h->root.type == bfd_link_hash_undefined))
1292 *type_change_ok = TRUE;
1294 /* It's OK to change the size if either the existing symbol or the
1295 new symbol is weak, or if the old symbol is undefined. */
1298 || h->root.type == bfd_link_hash_undefined)
1299 *size_change_ok = TRUE;
1301 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1302 symbol, respectively, appears to be a common symbol in a dynamic
1303 object. If a symbol appears in an uninitialized section, and is
1304 not weak, and is not a function, then it may be a common symbol
1305 which was resolved when the dynamic object was created. We want
1306 to treat such symbols specially, because they raise special
1307 considerations when setting the symbol size: if the symbol
1308 appears as a common symbol in a regular object, and the size in
1309 the regular object is larger, we must make sure that we use the
1310 larger size. This problematic case can always be avoided in C,
1311 but it must be handled correctly when using Fortran shared
1314 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1315 likewise for OLDDYNCOMMON and OLDDEF.
1317 Note that this test is just a heuristic, and that it is quite
1318 possible to have an uninitialized symbol in a shared object which
1319 is really a definition, rather than a common symbol. This could
1320 lead to some minor confusion when the symbol really is a common
1321 symbol in some regular object. However, I think it will be
1327 && (sec->flags & SEC_ALLOC) != 0
1328 && (sec->flags & SEC_LOAD) == 0
1331 newdyncommon = TRUE;
1333 newdyncommon = FALSE;
1337 && h->root.type == bfd_link_hash_defined
1339 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1340 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1343 olddyncommon = TRUE;
1345 olddyncommon = FALSE;
1347 /* We now know everything about the old and new symbols. We ask the
1348 backend to check if we can merge them. */
1349 if (bed->merge_symbol != NULL)
1351 if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
1356 /* If both the old and the new symbols look like common symbols in a
1357 dynamic object, set the size of the symbol to the larger of the
1362 && sym->st_size != h->size)
1364 /* Since we think we have two common symbols, issue a multiple
1365 common warning if desired. Note that we only warn if the
1366 size is different. If the size is the same, we simply let
1367 the old symbol override the new one as normally happens with
1368 symbols defined in dynamic objects. */
1370 if (! ((*info->callbacks->multiple_common)
1371 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1374 if (sym->st_size > h->size)
1375 h->size = sym->st_size;
1377 *size_change_ok = TRUE;
1380 /* If we are looking at a dynamic object, and we have found a
1381 definition, we need to see if the symbol was already defined by
1382 some other object. If so, we want to use the existing
1383 definition, and we do not want to report a multiple symbol
1384 definition error; we do this by clobbering *PSEC to be
1385 bfd_und_section_ptr.
1387 We treat a common symbol as a definition if the symbol in the
1388 shared library is a function, since common symbols always
1389 represent variables; this can cause confusion in principle, but
1390 any such confusion would seem to indicate an erroneous program or
1391 shared library. We also permit a common symbol in a regular
1392 object to override a weak symbol in a shared object. */
1397 || (h->root.type == bfd_link_hash_common
1398 && (newweak || newfunc))))
1402 newdyncommon = FALSE;
1404 *psec = sec = bfd_und_section_ptr;
1405 *size_change_ok = TRUE;
1407 /* If we get here when the old symbol is a common symbol, then
1408 we are explicitly letting it override a weak symbol or
1409 function in a dynamic object, and we don't want to warn about
1410 a type change. If the old symbol is a defined symbol, a type
1411 change warning may still be appropriate. */
1413 if (h->root.type == bfd_link_hash_common)
1414 *type_change_ok = TRUE;
1417 /* Handle the special case of an old common symbol merging with a
1418 new symbol which looks like a common symbol in a shared object.
1419 We change *PSEC and *PVALUE to make the new symbol look like a
1420 common symbol, and let _bfd_generic_link_add_one_symbol do the
1424 && h->root.type == bfd_link_hash_common)
1428 newdyncommon = FALSE;
1429 *pvalue = sym->st_size;
1430 *psec = sec = bed->common_section (oldsec);
1431 *size_change_ok = TRUE;
1434 /* Skip weak definitions of symbols that are already defined. */
1435 if (newdef && olddef && newweak)
1437 /* Don't skip new non-IR weak syms. */
1438 if (!(oldbfd != NULL
1439 && (oldbfd->flags & BFD_PLUGIN) != 0
1440 && (abfd->flags & BFD_PLUGIN) == 0))
1443 /* Merge st_other. If the symbol already has a dynamic index,
1444 but visibility says it should not be visible, turn it into a
1446 elf_merge_st_other (abfd, h, sym, newdef, newdyn);
1447 if (h->dynindx != -1)
1448 switch (ELF_ST_VISIBILITY (h->other))
1452 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1457 /* If the old symbol is from a dynamic object, and the new symbol is
1458 a definition which is not from a dynamic object, then the new
1459 symbol overrides the old symbol. Symbols from regular files
1460 always take precedence over symbols from dynamic objects, even if
1461 they are defined after the dynamic object in the link.
1463 As above, we again permit a common symbol in a regular object to
1464 override a definition in a shared object if the shared object
1465 symbol is a function or is weak. */
1470 || (bfd_is_com_section (sec)
1471 && (oldweak || oldfunc)))
1476 /* Change the hash table entry to undefined, and let
1477 _bfd_generic_link_add_one_symbol do the right thing with the
1480 h->root.type = bfd_link_hash_undefined;
1481 h->root.u.undef.abfd = h->root.u.def.section->owner;
1482 *size_change_ok = TRUE;
1485 olddyncommon = FALSE;
1487 /* We again permit a type change when a common symbol may be
1488 overriding a function. */
1490 if (bfd_is_com_section (sec))
1494 /* If a common symbol overrides a function, make sure
1495 that it isn't defined dynamically nor has type
1498 h->type = STT_NOTYPE;
1500 *type_change_ok = TRUE;
1503 if (hi->root.type == bfd_link_hash_indirect)
1506 /* This union may have been set to be non-NULL when this symbol
1507 was seen in a dynamic object. We must force the union to be
1508 NULL, so that it is correct for a regular symbol. */
1509 h->verinfo.vertree = NULL;
1512 /* Handle the special case of a new common symbol merging with an
1513 old symbol that looks like it might be a common symbol defined in
1514 a shared object. Note that we have already handled the case in
1515 which a new common symbol should simply override the definition
1516 in the shared library. */
1519 && bfd_is_com_section (sec)
1522 /* It would be best if we could set the hash table entry to a
1523 common symbol, but we don't know what to use for the section
1524 or the alignment. */
1525 if (! ((*info->callbacks->multiple_common)
1526 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1529 /* If the presumed common symbol in the dynamic object is
1530 larger, pretend that the new symbol has its size. */
1532 if (h->size > *pvalue)
1535 /* We need to remember the alignment required by the symbol
1536 in the dynamic object. */
1537 BFD_ASSERT (pold_alignment);
1538 *pold_alignment = h->root.u.def.section->alignment_power;
1541 olddyncommon = FALSE;
1543 h->root.type = bfd_link_hash_undefined;
1544 h->root.u.undef.abfd = h->root.u.def.section->owner;
1546 *size_change_ok = TRUE;
1547 *type_change_ok = TRUE;
1549 if (hi->root.type == bfd_link_hash_indirect)
1552 h->verinfo.vertree = NULL;
1557 /* Handle the case where we had a versioned symbol in a dynamic
1558 library and now find a definition in a normal object. In this
1559 case, we make the versioned symbol point to the normal one. */
1560 flip->root.type = h->root.type;
1561 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1562 h->root.type = bfd_link_hash_indirect;
1563 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1564 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1568 flip->ref_dynamic = 1;
1575 /* This function is called to create an indirect symbol from the
1576 default for the symbol with the default version if needed. The
1577 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1578 set DYNSYM if the new indirect symbol is dynamic. */
1581 _bfd_elf_add_default_symbol (bfd *abfd,
1582 struct bfd_link_info *info,
1583 struct elf_link_hash_entry *h,
1585 Elf_Internal_Sym *sym,
1589 bfd_boolean *dynsym)
1591 bfd_boolean type_change_ok;
1592 bfd_boolean size_change_ok;
1595 struct elf_link_hash_entry *hi;
1596 struct bfd_link_hash_entry *bh;
1597 const struct elf_backend_data *bed;
1598 bfd_boolean collect;
1599 bfd_boolean dynamic;
1600 bfd_boolean override;
1602 size_t len, shortlen;
1605 /* If this symbol has a version, and it is the default version, we
1606 create an indirect symbol from the default name to the fully
1607 decorated name. This will cause external references which do not
1608 specify a version to be bound to this version of the symbol. */
1609 p = strchr (name, ELF_VER_CHR);
1610 if (p == NULL || p[1] != ELF_VER_CHR)
1613 bed = get_elf_backend_data (abfd);
1614 collect = bed->collect;
1615 dynamic = (abfd->flags & DYNAMIC) != 0;
1617 shortlen = p - name;
1618 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1619 if (shortname == NULL)
1621 memcpy (shortname, name, shortlen);
1622 shortname[shortlen] = '\0';
1624 /* We are going to create a new symbol. Merge it with any existing
1625 symbol with this name. For the purposes of the merge, act as
1626 though we were defining the symbol we just defined, although we
1627 actually going to define an indirect symbol. */
1628 type_change_ok = FALSE;
1629 size_change_ok = FALSE;
1631 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1632 &hi, poldbfd, NULL, NULL, &skip, &override,
1633 &type_change_ok, &size_change_ok))
1642 if (! (_bfd_generic_link_add_one_symbol
1643 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1644 0, name, FALSE, collect, &bh)))
1646 hi = (struct elf_link_hash_entry *) bh;
1650 /* In this case the symbol named SHORTNAME is overriding the
1651 indirect symbol we want to add. We were planning on making
1652 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1653 is the name without a version. NAME is the fully versioned
1654 name, and it is the default version.
1656 Overriding means that we already saw a definition for the
1657 symbol SHORTNAME in a regular object, and it is overriding
1658 the symbol defined in the dynamic object.
1660 When this happens, we actually want to change NAME, the
1661 symbol we just added, to refer to SHORTNAME. This will cause
1662 references to NAME in the shared object to become references
1663 to SHORTNAME in the regular object. This is what we expect
1664 when we override a function in a shared object: that the
1665 references in the shared object will be mapped to the
1666 definition in the regular object. */
1668 while (hi->root.type == bfd_link_hash_indirect
1669 || hi->root.type == bfd_link_hash_warning)
1670 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1672 h->root.type = bfd_link_hash_indirect;
1673 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1677 hi->ref_dynamic = 1;
1681 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1686 /* Now set HI to H, so that the following code will set the
1687 other fields correctly. */
1691 /* Check if HI is a warning symbol. */
1692 if (hi->root.type == bfd_link_hash_warning)
1693 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1695 /* If there is a duplicate definition somewhere, then HI may not
1696 point to an indirect symbol. We will have reported an error to
1697 the user in that case. */
1699 if (hi->root.type == bfd_link_hash_indirect)
1701 struct elf_link_hash_entry *ht;
1703 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1704 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1706 /* See if the new flags lead us to realize that the symbol must
1712 if (! info->executable
1719 if (hi->ref_regular)
1725 /* We also need to define an indirection from the nondefault version
1729 len = strlen (name);
1730 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1731 if (shortname == NULL)
1733 memcpy (shortname, name, shortlen);
1734 memcpy (shortname + shortlen, p + 1, len - shortlen);
1736 /* Once again, merge with any existing symbol. */
1737 type_change_ok = FALSE;
1738 size_change_ok = FALSE;
1740 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1741 &hi, NULL, NULL, NULL, &skip, &override,
1742 &type_change_ok, &size_change_ok))
1750 /* Here SHORTNAME is a versioned name, so we don't expect to see
1751 the type of override we do in the case above unless it is
1752 overridden by a versioned definition. */
1753 if (hi->root.type != bfd_link_hash_defined
1754 && hi->root.type != bfd_link_hash_defweak)
1755 (*_bfd_error_handler)
1756 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1762 if (! (_bfd_generic_link_add_one_symbol
1763 (info, abfd, shortname, BSF_INDIRECT,
1764 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1766 hi = (struct elf_link_hash_entry *) bh;
1768 /* If there is a duplicate definition somewhere, then HI may not
1769 point to an indirect symbol. We will have reported an error
1770 to the user in that case. */
1772 if (hi->root.type == bfd_link_hash_indirect)
1774 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1776 /* See if the new flags lead us to realize that the symbol
1782 if (! info->executable
1788 if (hi->ref_regular)
1798 /* This routine is used to export all defined symbols into the dynamic
1799 symbol table. It is called via elf_link_hash_traverse. */
1802 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1804 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1806 /* Ignore indirect symbols. These are added by the versioning code. */
1807 if (h->root.type == bfd_link_hash_indirect)
1810 /* Ignore this if we won't export it. */
1811 if (!eif->info->export_dynamic && !h->dynamic)
1814 if (h->dynindx == -1
1815 && (h->def_regular || h->ref_regular)
1816 && ! bfd_hide_sym_by_version (eif->info->version_info,
1817 h->root.root.string))
1819 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1829 /* Look through the symbols which are defined in other shared
1830 libraries and referenced here. Update the list of version
1831 dependencies. This will be put into the .gnu.version_r section.
1832 This function is called via elf_link_hash_traverse. */
1835 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1838 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1839 Elf_Internal_Verneed *t;
1840 Elf_Internal_Vernaux *a;
1843 /* We only care about symbols defined in shared objects with version
1848 || h->verinfo.verdef == NULL)
1851 /* See if we already know about this version. */
1852 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1856 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1859 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1860 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1866 /* This is a new version. Add it to tree we are building. */
1871 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1874 rinfo->failed = TRUE;
1878 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1879 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1880 elf_tdata (rinfo->info->output_bfd)->verref = t;
1884 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1887 rinfo->failed = TRUE;
1891 /* Note that we are copying a string pointer here, and testing it
1892 above. If bfd_elf_string_from_elf_section is ever changed to
1893 discard the string data when low in memory, this will have to be
1895 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1897 a->vna_flags = h->verinfo.verdef->vd_flags;
1898 a->vna_nextptr = t->vn_auxptr;
1900 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1903 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1910 /* Figure out appropriate versions for all the symbols. We may not
1911 have the version number script until we have read all of the input
1912 files, so until that point we don't know which symbols should be
1913 local. This function is called via elf_link_hash_traverse. */
1916 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1918 struct elf_info_failed *sinfo;
1919 struct bfd_link_info *info;
1920 const struct elf_backend_data *bed;
1921 struct elf_info_failed eif;
1925 sinfo = (struct elf_info_failed *) data;
1928 /* Fix the symbol flags. */
1931 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1934 sinfo->failed = TRUE;
1938 /* We only need version numbers for symbols defined in regular
1940 if (!h->def_regular)
1943 bed = get_elf_backend_data (info->output_bfd);
1944 p = strchr (h->root.root.string, ELF_VER_CHR);
1945 if (p != NULL && h->verinfo.vertree == NULL)
1947 struct bfd_elf_version_tree *t;
1952 /* There are two consecutive ELF_VER_CHR characters if this is
1953 not a hidden symbol. */
1955 if (*p == ELF_VER_CHR)
1961 /* If there is no version string, we can just return out. */
1969 /* Look for the version. If we find it, it is no longer weak. */
1970 for (t = sinfo->info->version_info; t != NULL; t = t->next)
1972 if (strcmp (t->name, p) == 0)
1976 struct bfd_elf_version_expr *d;
1978 len = p - h->root.root.string;
1979 alc = (char *) bfd_malloc (len);
1982 sinfo->failed = TRUE;
1985 memcpy (alc, h->root.root.string, len - 1);
1986 alc[len - 1] = '\0';
1987 if (alc[len - 2] == ELF_VER_CHR)
1988 alc[len - 2] = '\0';
1990 h->verinfo.vertree = t;
1994 if (t->globals.list != NULL)
1995 d = (*t->match) (&t->globals, NULL, alc);
1997 /* See if there is anything to force this symbol to
1999 if (d == NULL && t->locals.list != NULL)
2001 d = (*t->match) (&t->locals, NULL, alc);
2004 && ! info->export_dynamic)
2005 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2013 /* If we are building an application, we need to create a
2014 version node for this version. */
2015 if (t == NULL && info->executable)
2017 struct bfd_elf_version_tree **pp;
2020 /* If we aren't going to export this symbol, we don't need
2021 to worry about it. */
2022 if (h->dynindx == -1)
2026 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2029 sinfo->failed = TRUE;
2034 t->name_indx = (unsigned int) -1;
2038 /* Don't count anonymous version tag. */
2039 if (sinfo->info->version_info != NULL
2040 && sinfo->info->version_info->vernum == 0)
2042 for (pp = &sinfo->info->version_info;
2046 t->vernum = version_index;
2050 h->verinfo.vertree = t;
2054 /* We could not find the version for a symbol when
2055 generating a shared archive. Return an error. */
2056 (*_bfd_error_handler)
2057 (_("%B: version node not found for symbol %s"),
2058 info->output_bfd, h->root.root.string);
2059 bfd_set_error (bfd_error_bad_value);
2060 sinfo->failed = TRUE;
2068 /* If we don't have a version for this symbol, see if we can find
2070 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2075 = bfd_find_version_for_sym (sinfo->info->version_info,
2076 h->root.root.string, &hide);
2077 if (h->verinfo.vertree != NULL && hide)
2078 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2084 /* Read and swap the relocs from the section indicated by SHDR. This
2085 may be either a REL or a RELA section. The relocations are
2086 translated into RELA relocations and stored in INTERNAL_RELOCS,
2087 which should have already been allocated to contain enough space.
2088 The EXTERNAL_RELOCS are a buffer where the external form of the
2089 relocations should be stored.
2091 Returns FALSE if something goes wrong. */
2094 elf_link_read_relocs_from_section (bfd *abfd,
2096 Elf_Internal_Shdr *shdr,
2097 void *external_relocs,
2098 Elf_Internal_Rela *internal_relocs)
2100 const struct elf_backend_data *bed;
2101 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2102 const bfd_byte *erela;
2103 const bfd_byte *erelaend;
2104 Elf_Internal_Rela *irela;
2105 Elf_Internal_Shdr *symtab_hdr;
2108 /* Position ourselves at the start of the section. */
2109 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2112 /* Read the relocations. */
2113 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2116 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2117 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2119 bed = get_elf_backend_data (abfd);
2121 /* Convert the external relocations to the internal format. */
2122 if (shdr->sh_entsize == bed->s->sizeof_rel)
2123 swap_in = bed->s->swap_reloc_in;
2124 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2125 swap_in = bed->s->swap_reloca_in;
2128 bfd_set_error (bfd_error_wrong_format);
2132 erela = (const bfd_byte *) external_relocs;
2133 erelaend = erela + shdr->sh_size;
2134 irela = internal_relocs;
2135 while (erela < erelaend)
2139 (*swap_in) (abfd, erela, irela);
2140 r_symndx = ELF32_R_SYM (irela->r_info);
2141 if (bed->s->arch_size == 64)
2145 if ((size_t) r_symndx >= nsyms)
2147 (*_bfd_error_handler)
2148 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2149 " for offset 0x%lx in section `%A'"),
2151 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2152 bfd_set_error (bfd_error_bad_value);
2156 else if (r_symndx != STN_UNDEF)
2158 (*_bfd_error_handler)
2159 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2160 " when the object file has no symbol table"),
2162 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2163 bfd_set_error (bfd_error_bad_value);
2166 irela += bed->s->int_rels_per_ext_rel;
2167 erela += shdr->sh_entsize;
2173 /* Read and swap the relocs for a section O. They may have been
2174 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2175 not NULL, they are used as buffers to read into. They are known to
2176 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2177 the return value is allocated using either malloc or bfd_alloc,
2178 according to the KEEP_MEMORY argument. If O has two relocation
2179 sections (both REL and RELA relocations), then the REL_HDR
2180 relocations will appear first in INTERNAL_RELOCS, followed by the
2181 RELA_HDR relocations. */
2184 _bfd_elf_link_read_relocs (bfd *abfd,
2186 void *external_relocs,
2187 Elf_Internal_Rela *internal_relocs,
2188 bfd_boolean keep_memory)
2190 void *alloc1 = NULL;
2191 Elf_Internal_Rela *alloc2 = NULL;
2192 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2193 struct bfd_elf_section_data *esdo = elf_section_data (o);
2194 Elf_Internal_Rela *internal_rela_relocs;
2196 if (esdo->relocs != NULL)
2197 return esdo->relocs;
2199 if (o->reloc_count == 0)
2202 if (internal_relocs == NULL)
2206 size = o->reloc_count;
2207 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2209 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2211 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2212 if (internal_relocs == NULL)
2216 if (external_relocs == NULL)
2218 bfd_size_type size = 0;
2221 size += esdo->rel.hdr->sh_size;
2223 size += esdo->rela.hdr->sh_size;
2225 alloc1 = bfd_malloc (size);
2228 external_relocs = alloc1;
2231 internal_rela_relocs = internal_relocs;
2234 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2238 external_relocs = (((bfd_byte *) external_relocs)
2239 + esdo->rel.hdr->sh_size);
2240 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2241 * bed->s->int_rels_per_ext_rel);
2245 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2247 internal_rela_relocs)))
2250 /* Cache the results for next time, if we can. */
2252 esdo->relocs = internal_relocs;
2257 /* Don't free alloc2, since if it was allocated we are passing it
2258 back (under the name of internal_relocs). */
2260 return internal_relocs;
2268 bfd_release (abfd, alloc2);
2275 /* Compute the size of, and allocate space for, REL_HDR which is the
2276 section header for a section containing relocations for O. */
2279 _bfd_elf_link_size_reloc_section (bfd *abfd,
2280 struct bfd_elf_section_reloc_data *reldata)
2282 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2284 /* That allows us to calculate the size of the section. */
2285 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2287 /* The contents field must last into write_object_contents, so we
2288 allocate it with bfd_alloc rather than malloc. Also since we
2289 cannot be sure that the contents will actually be filled in,
2290 we zero the allocated space. */
2291 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2292 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2295 if (reldata->hashes == NULL && reldata->count)
2297 struct elf_link_hash_entry **p;
2299 p = (struct elf_link_hash_entry **)
2300 bfd_zmalloc (reldata->count * sizeof (struct elf_link_hash_entry *));
2304 reldata->hashes = p;
2310 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2311 originated from the section given by INPUT_REL_HDR) to the
2315 _bfd_elf_link_output_relocs (bfd *output_bfd,
2316 asection *input_section,
2317 Elf_Internal_Shdr *input_rel_hdr,
2318 Elf_Internal_Rela *internal_relocs,
2319 struct elf_link_hash_entry **rel_hash
2322 Elf_Internal_Rela *irela;
2323 Elf_Internal_Rela *irelaend;
2325 struct bfd_elf_section_reloc_data *output_reldata;
2326 asection *output_section;
2327 const struct elf_backend_data *bed;
2328 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2329 struct bfd_elf_section_data *esdo;
2331 output_section = input_section->output_section;
2333 bed = get_elf_backend_data (output_bfd);
2334 esdo = elf_section_data (output_section);
2335 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2337 output_reldata = &esdo->rel;
2338 swap_out = bed->s->swap_reloc_out;
2340 else if (esdo->rela.hdr
2341 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2343 output_reldata = &esdo->rela;
2344 swap_out = bed->s->swap_reloca_out;
2348 (*_bfd_error_handler)
2349 (_("%B: relocation size mismatch in %B section %A"),
2350 output_bfd, input_section->owner, input_section);
2351 bfd_set_error (bfd_error_wrong_format);
2355 erel = output_reldata->hdr->contents;
2356 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2357 irela = internal_relocs;
2358 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2359 * bed->s->int_rels_per_ext_rel);
2360 while (irela < irelaend)
2362 (*swap_out) (output_bfd, irela, erel);
2363 irela += bed->s->int_rels_per_ext_rel;
2364 erel += input_rel_hdr->sh_entsize;
2367 /* Bump the counter, so that we know where to add the next set of
2369 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2374 /* Make weak undefined symbols in PIE dynamic. */
2377 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2378 struct elf_link_hash_entry *h)
2382 && h->root.type == bfd_link_hash_undefweak)
2383 return bfd_elf_link_record_dynamic_symbol (info, h);
2388 /* Fix up the flags for a symbol. This handles various cases which
2389 can only be fixed after all the input files are seen. This is
2390 currently called by both adjust_dynamic_symbol and
2391 assign_sym_version, which is unnecessary but perhaps more robust in
2392 the face of future changes. */
2395 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2396 struct elf_info_failed *eif)
2398 const struct elf_backend_data *bed;
2400 /* If this symbol was mentioned in a non-ELF file, try to set
2401 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2402 permit a non-ELF file to correctly refer to a symbol defined in
2403 an ELF dynamic object. */
2406 while (h->root.type == bfd_link_hash_indirect)
2407 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2409 if (h->root.type != bfd_link_hash_defined
2410 && h->root.type != bfd_link_hash_defweak)
2413 h->ref_regular_nonweak = 1;
2417 if (h->root.u.def.section->owner != NULL
2418 && (bfd_get_flavour (h->root.u.def.section->owner)
2419 == bfd_target_elf_flavour))
2422 h->ref_regular_nonweak = 1;
2428 if (h->dynindx == -1
2432 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2441 /* Unfortunately, NON_ELF is only correct if the symbol
2442 was first seen in a non-ELF file. Fortunately, if the symbol
2443 was first seen in an ELF file, we're probably OK unless the
2444 symbol was defined in a non-ELF file. Catch that case here.
2445 FIXME: We're still in trouble if the symbol was first seen in
2446 a dynamic object, and then later in a non-ELF regular object. */
2447 if ((h->root.type == bfd_link_hash_defined
2448 || h->root.type == bfd_link_hash_defweak)
2450 && (h->root.u.def.section->owner != NULL
2451 ? (bfd_get_flavour (h->root.u.def.section->owner)
2452 != bfd_target_elf_flavour)
2453 : (bfd_is_abs_section (h->root.u.def.section)
2454 && !h->def_dynamic)))
2458 /* Backend specific symbol fixup. */
2459 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2460 if (bed->elf_backend_fixup_symbol
2461 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2464 /* If this is a final link, and the symbol was defined as a common
2465 symbol in a regular object file, and there was no definition in
2466 any dynamic object, then the linker will have allocated space for
2467 the symbol in a common section but the DEF_REGULAR
2468 flag will not have been set. */
2469 if (h->root.type == bfd_link_hash_defined
2473 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2476 /* If -Bsymbolic was used (which means to bind references to global
2477 symbols to the definition within the shared object), and this
2478 symbol was defined in a regular object, then it actually doesn't
2479 need a PLT entry. Likewise, if the symbol has non-default
2480 visibility. If the symbol has hidden or internal visibility, we
2481 will force it local. */
2483 && eif->info->shared
2484 && is_elf_hash_table (eif->info->hash)
2485 && (SYMBOLIC_BIND (eif->info, h)
2486 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2489 bfd_boolean force_local;
2491 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2492 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2493 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2496 /* If a weak undefined symbol has non-default visibility, we also
2497 hide it from the dynamic linker. */
2498 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2499 && h->root.type == bfd_link_hash_undefweak)
2500 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2502 /* If this is a weak defined symbol in a dynamic object, and we know
2503 the real definition in the dynamic object, copy interesting flags
2504 over to the real definition. */
2505 if (h->u.weakdef != NULL)
2507 /* If the real definition is defined by a regular object file,
2508 don't do anything special. See the longer description in
2509 _bfd_elf_adjust_dynamic_symbol, below. */
2510 if (h->u.weakdef->def_regular)
2511 h->u.weakdef = NULL;
2514 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2516 while (h->root.type == bfd_link_hash_indirect)
2517 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2519 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2520 || h->root.type == bfd_link_hash_defweak);
2521 BFD_ASSERT (weakdef->def_dynamic);
2522 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2523 || weakdef->root.type == bfd_link_hash_defweak);
2524 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2531 /* Make the backend pick a good value for a dynamic symbol. This is
2532 called via elf_link_hash_traverse, and also calls itself
2536 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2538 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2540 const struct elf_backend_data *bed;
2542 if (! is_elf_hash_table (eif->info->hash))
2545 /* Ignore indirect symbols. These are added by the versioning code. */
2546 if (h->root.type == bfd_link_hash_indirect)
2549 /* Fix the symbol flags. */
2550 if (! _bfd_elf_fix_symbol_flags (h, eif))
2553 /* If this symbol does not require a PLT entry, and it is not
2554 defined by a dynamic object, or is not referenced by a regular
2555 object, ignore it. We do have to handle a weak defined symbol,
2556 even if no regular object refers to it, if we decided to add it
2557 to the dynamic symbol table. FIXME: Do we normally need to worry
2558 about symbols which are defined by one dynamic object and
2559 referenced by another one? */
2561 && h->type != STT_GNU_IFUNC
2565 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2567 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2571 /* If we've already adjusted this symbol, don't do it again. This
2572 can happen via a recursive call. */
2573 if (h->dynamic_adjusted)
2576 /* Don't look at this symbol again. Note that we must set this
2577 after checking the above conditions, because we may look at a
2578 symbol once, decide not to do anything, and then get called
2579 recursively later after REF_REGULAR is set below. */
2580 h->dynamic_adjusted = 1;
2582 /* If this is a weak definition, and we know a real definition, and
2583 the real symbol is not itself defined by a regular object file,
2584 then get a good value for the real definition. We handle the
2585 real symbol first, for the convenience of the backend routine.
2587 Note that there is a confusing case here. If the real definition
2588 is defined by a regular object file, we don't get the real symbol
2589 from the dynamic object, but we do get the weak symbol. If the
2590 processor backend uses a COPY reloc, then if some routine in the
2591 dynamic object changes the real symbol, we will not see that
2592 change in the corresponding weak symbol. This is the way other
2593 ELF linkers work as well, and seems to be a result of the shared
2596 I will clarify this issue. Most SVR4 shared libraries define the
2597 variable _timezone and define timezone as a weak synonym. The
2598 tzset call changes _timezone. If you write
2599 extern int timezone;
2601 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2602 you might expect that, since timezone is a synonym for _timezone,
2603 the same number will print both times. However, if the processor
2604 backend uses a COPY reloc, then actually timezone will be copied
2605 into your process image, and, since you define _timezone
2606 yourself, _timezone will not. Thus timezone and _timezone will
2607 wind up at different memory locations. The tzset call will set
2608 _timezone, leaving timezone unchanged. */
2610 if (h->u.weakdef != NULL)
2612 /* If we get to this point, there is an implicit reference to
2613 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2614 h->u.weakdef->ref_regular = 1;
2616 /* Ensure that the backend adjust_dynamic_symbol function sees
2617 H->U.WEAKDEF before H by recursively calling ourselves. */
2618 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2622 /* If a symbol has no type and no size and does not require a PLT
2623 entry, then we are probably about to do the wrong thing here: we
2624 are probably going to create a COPY reloc for an empty object.
2625 This case can arise when a shared object is built with assembly
2626 code, and the assembly code fails to set the symbol type. */
2628 && h->type == STT_NOTYPE
2630 (*_bfd_error_handler)
2631 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2632 h->root.root.string);
2634 dynobj = elf_hash_table (eif->info)->dynobj;
2635 bed = get_elf_backend_data (dynobj);
2637 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2646 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2650 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
2653 unsigned int power_of_two;
2655 asection *sec = h->root.u.def.section;
2657 /* The section aligment of definition is the maximum alignment
2658 requirement of symbols defined in the section. Since we don't
2659 know the symbol alignment requirement, we start with the
2660 maximum alignment and check low bits of the symbol address
2661 for the minimum alignment. */
2662 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2663 mask = ((bfd_vma) 1 << power_of_two) - 1;
2664 while ((h->root.u.def.value & mask) != 0)
2670 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2673 /* Adjust the section alignment if needed. */
2674 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2679 /* We make sure that the symbol will be aligned properly. */
2680 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2682 /* Define the symbol as being at this point in DYNBSS. */
2683 h->root.u.def.section = dynbss;
2684 h->root.u.def.value = dynbss->size;
2686 /* Increment the size of DYNBSS to make room for the symbol. */
2687 dynbss->size += h->size;
2692 /* Adjust all external symbols pointing into SEC_MERGE sections
2693 to reflect the object merging within the sections. */
2696 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2700 if ((h->root.type == bfd_link_hash_defined
2701 || h->root.type == bfd_link_hash_defweak)
2702 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2703 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2705 bfd *output_bfd = (bfd *) data;
2707 h->root.u.def.value =
2708 _bfd_merged_section_offset (output_bfd,
2709 &h->root.u.def.section,
2710 elf_section_data (sec)->sec_info,
2711 h->root.u.def.value);
2717 /* Returns false if the symbol referred to by H should be considered
2718 to resolve local to the current module, and true if it should be
2719 considered to bind dynamically. */
2722 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2723 struct bfd_link_info *info,
2724 bfd_boolean not_local_protected)
2726 bfd_boolean binding_stays_local_p;
2727 const struct elf_backend_data *bed;
2728 struct elf_link_hash_table *hash_table;
2733 while (h->root.type == bfd_link_hash_indirect
2734 || h->root.type == bfd_link_hash_warning)
2735 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2737 /* If it was forced local, then clearly it's not dynamic. */
2738 if (h->dynindx == -1)
2740 if (h->forced_local)
2743 /* Identify the cases where name binding rules say that a
2744 visible symbol resolves locally. */
2745 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2747 switch (ELF_ST_VISIBILITY (h->other))
2754 hash_table = elf_hash_table (info);
2755 if (!is_elf_hash_table (hash_table))
2758 bed = get_elf_backend_data (hash_table->dynobj);
2760 /* Proper resolution for function pointer equality may require
2761 that these symbols perhaps be resolved dynamically, even though
2762 we should be resolving them to the current module. */
2763 if (!not_local_protected || !bed->is_function_type (h->type))
2764 binding_stays_local_p = TRUE;
2771 /* If it isn't defined locally, then clearly it's dynamic. */
2772 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2775 /* Otherwise, the symbol is dynamic if binding rules don't tell
2776 us that it remains local. */
2777 return !binding_stays_local_p;
2780 /* Return true if the symbol referred to by H should be considered
2781 to resolve local to the current module, and false otherwise. Differs
2782 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2783 undefined symbols. The two functions are virtually identical except
2784 for the place where forced_local and dynindx == -1 are tested. If
2785 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2786 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2787 the symbol is local only for defined symbols.
2788 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2789 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2790 treatment of undefined weak symbols. For those that do not make
2791 undefined weak symbols dynamic, both functions may return false. */
2794 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2795 struct bfd_link_info *info,
2796 bfd_boolean local_protected)
2798 const struct elf_backend_data *bed;
2799 struct elf_link_hash_table *hash_table;
2801 /* If it's a local sym, of course we resolve locally. */
2805 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2806 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2807 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2810 /* Common symbols that become definitions don't get the DEF_REGULAR
2811 flag set, so test it first, and don't bail out. */
2812 if (ELF_COMMON_DEF_P (h))
2814 /* If we don't have a definition in a regular file, then we can't
2815 resolve locally. The sym is either undefined or dynamic. */
2816 else if (!h->def_regular)
2819 /* Forced local symbols resolve locally. */
2820 if (h->forced_local)
2823 /* As do non-dynamic symbols. */
2824 if (h->dynindx == -1)
2827 /* At this point, we know the symbol is defined and dynamic. In an
2828 executable it must resolve locally, likewise when building symbolic
2829 shared libraries. */
2830 if (info->executable || SYMBOLIC_BIND (info, h))
2833 /* Now deal with defined dynamic symbols in shared libraries. Ones
2834 with default visibility might not resolve locally. */
2835 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2838 hash_table = elf_hash_table (info);
2839 if (!is_elf_hash_table (hash_table))
2842 bed = get_elf_backend_data (hash_table->dynobj);
2844 /* STV_PROTECTED non-function symbols are local. */
2845 if (!bed->is_function_type (h->type))
2848 /* Function pointer equality tests may require that STV_PROTECTED
2849 symbols be treated as dynamic symbols. If the address of a
2850 function not defined in an executable is set to that function's
2851 plt entry in the executable, then the address of the function in
2852 a shared library must also be the plt entry in the executable. */
2853 return local_protected;
2856 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2857 aligned. Returns the first TLS output section. */
2859 struct bfd_section *
2860 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2862 struct bfd_section *sec, *tls;
2863 unsigned int align = 0;
2865 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2866 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2870 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2871 if (sec->alignment_power > align)
2872 align = sec->alignment_power;
2874 elf_hash_table (info)->tls_sec = tls;
2876 /* Ensure the alignment of the first section is the largest alignment,
2877 so that the tls segment starts aligned. */
2879 tls->alignment_power = align;
2884 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2886 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2887 Elf_Internal_Sym *sym)
2889 const struct elf_backend_data *bed;
2891 /* Local symbols do not count, but target specific ones might. */
2892 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2893 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2896 bed = get_elf_backend_data (abfd);
2897 /* Function symbols do not count. */
2898 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2901 /* If the section is undefined, then so is the symbol. */
2902 if (sym->st_shndx == SHN_UNDEF)
2905 /* If the symbol is defined in the common section, then
2906 it is a common definition and so does not count. */
2907 if (bed->common_definition (sym))
2910 /* If the symbol is in a target specific section then we
2911 must rely upon the backend to tell us what it is. */
2912 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2913 /* FIXME - this function is not coded yet:
2915 return _bfd_is_global_symbol_definition (abfd, sym);
2917 Instead for now assume that the definition is not global,
2918 Even if this is wrong, at least the linker will behave
2919 in the same way that it used to do. */
2925 /* Search the symbol table of the archive element of the archive ABFD
2926 whose archive map contains a mention of SYMDEF, and determine if
2927 the symbol is defined in this element. */
2929 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2931 Elf_Internal_Shdr * hdr;
2932 bfd_size_type symcount;
2933 bfd_size_type extsymcount;
2934 bfd_size_type extsymoff;
2935 Elf_Internal_Sym *isymbuf;
2936 Elf_Internal_Sym *isym;
2937 Elf_Internal_Sym *isymend;
2940 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2944 if (! bfd_check_format (abfd, bfd_object))
2947 /* If we have already included the element containing this symbol in the
2948 link then we do not need to include it again. Just claim that any symbol
2949 it contains is not a definition, so that our caller will not decide to
2950 (re)include this element. */
2951 if (abfd->archive_pass)
2954 /* Select the appropriate symbol table. */
2955 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2956 hdr = &elf_tdata (abfd)->symtab_hdr;
2958 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2960 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2962 /* The sh_info field of the symtab header tells us where the
2963 external symbols start. We don't care about the local symbols. */
2964 if (elf_bad_symtab (abfd))
2966 extsymcount = symcount;
2971 extsymcount = symcount - hdr->sh_info;
2972 extsymoff = hdr->sh_info;
2975 if (extsymcount == 0)
2978 /* Read in the symbol table. */
2979 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2981 if (isymbuf == NULL)
2984 /* Scan the symbol table looking for SYMDEF. */
2986 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
2990 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
2995 if (strcmp (name, symdef->name) == 0)
2997 result = is_global_data_symbol_definition (abfd, isym);
3007 /* Add an entry to the .dynamic table. */
3010 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3014 struct elf_link_hash_table *hash_table;
3015 const struct elf_backend_data *bed;
3017 bfd_size_type newsize;
3018 bfd_byte *newcontents;
3019 Elf_Internal_Dyn dyn;
3021 hash_table = elf_hash_table (info);
3022 if (! is_elf_hash_table (hash_table))
3025 bed = get_elf_backend_data (hash_table->dynobj);
3026 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3027 BFD_ASSERT (s != NULL);
3029 newsize = s->size + bed->s->sizeof_dyn;
3030 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3031 if (newcontents == NULL)
3035 dyn.d_un.d_val = val;
3036 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3039 s->contents = newcontents;
3044 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3045 otherwise just check whether one already exists. Returns -1 on error,
3046 1 if a DT_NEEDED tag already exists, and 0 on success. */
3049 elf_add_dt_needed_tag (bfd *abfd,
3050 struct bfd_link_info *info,
3054 struct elf_link_hash_table *hash_table;
3055 bfd_size_type strindex;
3057 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3060 hash_table = elf_hash_table (info);
3061 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3062 if (strindex == (bfd_size_type) -1)
3065 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3068 const struct elf_backend_data *bed;
3071 bed = get_elf_backend_data (hash_table->dynobj);
3072 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3074 for (extdyn = sdyn->contents;
3075 extdyn < sdyn->contents + sdyn->size;
3076 extdyn += bed->s->sizeof_dyn)
3078 Elf_Internal_Dyn dyn;
3080 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3081 if (dyn.d_tag == DT_NEEDED
3082 && dyn.d_un.d_val == strindex)
3084 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3092 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3095 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3099 /* We were just checking for existence of the tag. */
3100 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3106 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3108 for (; needed != NULL; needed = needed->next)
3109 if (strcmp (soname, needed->name) == 0)
3115 /* Sort symbol by value, section, and size. */
3117 elf_sort_symbol (const void *arg1, const void *arg2)
3119 const struct elf_link_hash_entry *h1;
3120 const struct elf_link_hash_entry *h2;
3121 bfd_signed_vma vdiff;
3123 h1 = *(const struct elf_link_hash_entry **) arg1;
3124 h2 = *(const struct elf_link_hash_entry **) arg2;
3125 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3127 return vdiff > 0 ? 1 : -1;
3130 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3132 return sdiff > 0 ? 1 : -1;
3134 vdiff = h1->size - h2->size;
3135 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3138 /* This function is used to adjust offsets into .dynstr for
3139 dynamic symbols. This is called via elf_link_hash_traverse. */
3142 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3144 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3146 if (h->dynindx != -1)
3147 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3151 /* Assign string offsets in .dynstr, update all structures referencing
3155 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3157 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3158 struct elf_link_local_dynamic_entry *entry;
3159 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3160 bfd *dynobj = hash_table->dynobj;
3163 const struct elf_backend_data *bed;
3166 _bfd_elf_strtab_finalize (dynstr);
3167 size = _bfd_elf_strtab_size (dynstr);
3169 bed = get_elf_backend_data (dynobj);
3170 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3171 BFD_ASSERT (sdyn != NULL);
3173 /* Update all .dynamic entries referencing .dynstr strings. */
3174 for (extdyn = sdyn->contents;
3175 extdyn < sdyn->contents + sdyn->size;
3176 extdyn += bed->s->sizeof_dyn)
3178 Elf_Internal_Dyn dyn;
3180 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3184 dyn.d_un.d_val = size;
3194 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3199 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3202 /* Now update local dynamic symbols. */
3203 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3204 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3205 entry->isym.st_name);
3207 /* And the rest of dynamic symbols. */
3208 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3210 /* Adjust version definitions. */
3211 if (elf_tdata (output_bfd)->cverdefs)
3216 Elf_Internal_Verdef def;
3217 Elf_Internal_Verdaux defaux;
3219 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3223 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3225 p += sizeof (Elf_External_Verdef);
3226 if (def.vd_aux != sizeof (Elf_External_Verdef))
3228 for (i = 0; i < def.vd_cnt; ++i)
3230 _bfd_elf_swap_verdaux_in (output_bfd,
3231 (Elf_External_Verdaux *) p, &defaux);
3232 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3234 _bfd_elf_swap_verdaux_out (output_bfd,
3235 &defaux, (Elf_External_Verdaux *) p);
3236 p += sizeof (Elf_External_Verdaux);
3239 while (def.vd_next);
3242 /* Adjust version references. */
3243 if (elf_tdata (output_bfd)->verref)
3248 Elf_Internal_Verneed need;
3249 Elf_Internal_Vernaux needaux;
3251 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3255 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3257 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3258 _bfd_elf_swap_verneed_out (output_bfd, &need,
3259 (Elf_External_Verneed *) p);
3260 p += sizeof (Elf_External_Verneed);
3261 for (i = 0; i < need.vn_cnt; ++i)
3263 _bfd_elf_swap_vernaux_in (output_bfd,
3264 (Elf_External_Vernaux *) p, &needaux);
3265 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3267 _bfd_elf_swap_vernaux_out (output_bfd,
3269 (Elf_External_Vernaux *) p);
3270 p += sizeof (Elf_External_Vernaux);
3273 while (need.vn_next);
3279 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3280 The default is to only match when the INPUT and OUTPUT are exactly
3284 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3285 const bfd_target *output)
3287 return input == output;
3290 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3291 This version is used when different targets for the same architecture
3292 are virtually identical. */
3295 _bfd_elf_relocs_compatible (const bfd_target *input,
3296 const bfd_target *output)
3298 const struct elf_backend_data *obed, *ibed;
3300 if (input == output)
3303 ibed = xvec_get_elf_backend_data (input);
3304 obed = xvec_get_elf_backend_data (output);
3306 if (ibed->arch != obed->arch)
3309 /* If both backends are using this function, deem them compatible. */
3310 return ibed->relocs_compatible == obed->relocs_compatible;
3313 /* Add symbols from an ELF object file to the linker hash table. */
3316 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3318 Elf_Internal_Ehdr *ehdr;
3319 Elf_Internal_Shdr *hdr;
3320 bfd_size_type symcount;
3321 bfd_size_type extsymcount;
3322 bfd_size_type extsymoff;
3323 struct elf_link_hash_entry **sym_hash;
3324 bfd_boolean dynamic;
3325 Elf_External_Versym *extversym = NULL;
3326 Elf_External_Versym *ever;
3327 struct elf_link_hash_entry *weaks;
3328 struct elf_link_hash_entry **nondeflt_vers = NULL;
3329 bfd_size_type nondeflt_vers_cnt = 0;
3330 Elf_Internal_Sym *isymbuf = NULL;
3331 Elf_Internal_Sym *isym;
3332 Elf_Internal_Sym *isymend;
3333 const struct elf_backend_data *bed;
3334 bfd_boolean add_needed;
3335 struct elf_link_hash_table *htab;
3337 void *alloc_mark = NULL;
3338 struct bfd_hash_entry **old_table = NULL;
3339 unsigned int old_size = 0;
3340 unsigned int old_count = 0;
3341 void *old_tab = NULL;
3344 struct bfd_link_hash_entry *old_undefs = NULL;
3345 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3346 long old_dynsymcount = 0;
3347 bfd_size_type old_dynstr_size = 0;
3349 size_t hashsize = 0;
3351 htab = elf_hash_table (info);
3352 bed = get_elf_backend_data (abfd);
3354 if ((abfd->flags & DYNAMIC) == 0)
3360 /* You can't use -r against a dynamic object. Also, there's no
3361 hope of using a dynamic object which does not exactly match
3362 the format of the output file. */
3363 if (info->relocatable
3364 || !is_elf_hash_table (htab)
3365 || info->output_bfd->xvec != abfd->xvec)
3367 if (info->relocatable)
3368 bfd_set_error (bfd_error_invalid_operation);
3370 bfd_set_error (bfd_error_wrong_format);
3375 ehdr = elf_elfheader (abfd);
3376 if (info->warn_alternate_em
3377 && bed->elf_machine_code != ehdr->e_machine
3378 && ((bed->elf_machine_alt1 != 0
3379 && ehdr->e_machine == bed->elf_machine_alt1)
3380 || (bed->elf_machine_alt2 != 0
3381 && ehdr->e_machine == bed->elf_machine_alt2)))
3382 info->callbacks->einfo
3383 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3384 ehdr->e_machine, abfd, bed->elf_machine_code);
3386 /* As a GNU extension, any input sections which are named
3387 .gnu.warning.SYMBOL are treated as warning symbols for the given
3388 symbol. This differs from .gnu.warning sections, which generate
3389 warnings when they are included in an output file. */
3390 /* PR 12761: Also generate this warning when building shared libraries. */
3391 if (info->executable || info->shared)
3395 for (s = abfd->sections; s != NULL; s = s->next)
3399 name = bfd_get_section_name (abfd, s);
3400 if (CONST_STRNEQ (name, ".gnu.warning."))
3405 name += sizeof ".gnu.warning." - 1;
3407 /* If this is a shared object, then look up the symbol
3408 in the hash table. If it is there, and it is already
3409 been defined, then we will not be using the entry
3410 from this shared object, so we don't need to warn.
3411 FIXME: If we see the definition in a regular object
3412 later on, we will warn, but we shouldn't. The only
3413 fix is to keep track of what warnings we are supposed
3414 to emit, and then handle them all at the end of the
3418 struct elf_link_hash_entry *h;
3420 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3422 /* FIXME: What about bfd_link_hash_common? */
3424 && (h->root.type == bfd_link_hash_defined
3425 || h->root.type == bfd_link_hash_defweak))
3427 /* We don't want to issue this warning. Clobber
3428 the section size so that the warning does not
3429 get copied into the output file. */
3436 msg = (char *) bfd_alloc (abfd, sz + 1);
3440 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3445 if (! (_bfd_generic_link_add_one_symbol
3446 (info, abfd, name, BSF_WARNING, s, 0, msg,
3447 FALSE, bed->collect, NULL)))
3450 if (! info->relocatable)
3452 /* Clobber the section size so that the warning does
3453 not get copied into the output file. */
3456 /* Also set SEC_EXCLUDE, so that symbols defined in
3457 the warning section don't get copied to the output. */
3458 s->flags |= SEC_EXCLUDE;
3467 /* If we are creating a shared library, create all the dynamic
3468 sections immediately. We need to attach them to something,
3469 so we attach them to this BFD, provided it is the right
3470 format. FIXME: If there are no input BFD's of the same
3471 format as the output, we can't make a shared library. */
3473 && is_elf_hash_table (htab)
3474 && info->output_bfd->xvec == abfd->xvec
3475 && !htab->dynamic_sections_created)
3477 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3481 else if (!is_elf_hash_table (htab))
3486 const char *soname = NULL;
3488 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3491 /* ld --just-symbols and dynamic objects don't mix very well.
3492 ld shouldn't allow it. */
3493 if ((s = abfd->sections) != NULL
3494 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3497 /* If this dynamic lib was specified on the command line with
3498 --as-needed in effect, then we don't want to add a DT_NEEDED
3499 tag unless the lib is actually used. Similary for libs brought
3500 in by another lib's DT_NEEDED. When --no-add-needed is used
3501 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3502 any dynamic library in DT_NEEDED tags in the dynamic lib at
3504 add_needed = (elf_dyn_lib_class (abfd)
3505 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3506 | DYN_NO_NEEDED)) == 0;
3508 s = bfd_get_section_by_name (abfd, ".dynamic");
3513 unsigned int elfsec;
3514 unsigned long shlink;
3516 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3523 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3524 if (elfsec == SHN_BAD)
3525 goto error_free_dyn;
3526 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3528 for (extdyn = dynbuf;
3529 extdyn < dynbuf + s->size;
3530 extdyn += bed->s->sizeof_dyn)
3532 Elf_Internal_Dyn dyn;
3534 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3535 if (dyn.d_tag == DT_SONAME)
3537 unsigned int tagv = dyn.d_un.d_val;
3538 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3540 goto error_free_dyn;
3542 if (dyn.d_tag == DT_NEEDED)
3544 struct bfd_link_needed_list *n, **pn;
3546 unsigned int tagv = dyn.d_un.d_val;
3548 amt = sizeof (struct bfd_link_needed_list);
3549 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3550 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3551 if (n == NULL || fnm == NULL)
3552 goto error_free_dyn;
3553 amt = strlen (fnm) + 1;
3554 anm = (char *) bfd_alloc (abfd, amt);
3556 goto error_free_dyn;
3557 memcpy (anm, fnm, amt);
3561 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3565 if (dyn.d_tag == DT_RUNPATH)
3567 struct bfd_link_needed_list *n, **pn;
3569 unsigned int tagv = dyn.d_un.d_val;
3571 amt = sizeof (struct bfd_link_needed_list);
3572 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3573 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3574 if (n == NULL || fnm == NULL)
3575 goto error_free_dyn;
3576 amt = strlen (fnm) + 1;
3577 anm = (char *) bfd_alloc (abfd, amt);
3579 goto error_free_dyn;
3580 memcpy (anm, fnm, amt);
3584 for (pn = & runpath;
3590 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3591 if (!runpath && dyn.d_tag == DT_RPATH)
3593 struct bfd_link_needed_list *n, **pn;
3595 unsigned int tagv = dyn.d_un.d_val;
3597 amt = sizeof (struct bfd_link_needed_list);
3598 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3599 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3600 if (n == NULL || fnm == NULL)
3601 goto error_free_dyn;
3602 amt = strlen (fnm) + 1;
3603 anm = (char *) bfd_alloc (abfd, amt);
3605 goto error_free_dyn;
3606 memcpy (anm, fnm, amt);
3616 if (dyn.d_tag == DT_AUDIT)
3618 unsigned int tagv = dyn.d_un.d_val;
3619 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3626 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3627 frees all more recently bfd_alloc'd blocks as well. */
3633 struct bfd_link_needed_list **pn;
3634 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3639 /* We do not want to include any of the sections in a dynamic
3640 object in the output file. We hack by simply clobbering the
3641 list of sections in the BFD. This could be handled more
3642 cleanly by, say, a new section flag; the existing
3643 SEC_NEVER_LOAD flag is not the one we want, because that one
3644 still implies that the section takes up space in the output
3646 bfd_section_list_clear (abfd);
3648 /* Find the name to use in a DT_NEEDED entry that refers to this
3649 object. If the object has a DT_SONAME entry, we use it.
3650 Otherwise, if the generic linker stuck something in
3651 elf_dt_name, we use that. Otherwise, we just use the file
3653 if (soname == NULL || *soname == '\0')
3655 soname = elf_dt_name (abfd);
3656 if (soname == NULL || *soname == '\0')
3657 soname = bfd_get_filename (abfd);
3660 /* Save the SONAME because sometimes the linker emulation code
3661 will need to know it. */
3662 elf_dt_name (abfd) = soname;
3664 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3668 /* If we have already included this dynamic object in the
3669 link, just ignore it. There is no reason to include a
3670 particular dynamic object more than once. */
3674 /* Save the DT_AUDIT entry for the linker emulation code. */
3675 elf_dt_audit (abfd) = audit;
3678 /* If this is a dynamic object, we always link against the .dynsym
3679 symbol table, not the .symtab symbol table. The dynamic linker
3680 will only see the .dynsym symbol table, so there is no reason to
3681 look at .symtab for a dynamic object. */
3683 if (! dynamic || elf_dynsymtab (abfd) == 0)
3684 hdr = &elf_tdata (abfd)->symtab_hdr;
3686 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3688 symcount = hdr->sh_size / bed->s->sizeof_sym;
3690 /* The sh_info field of the symtab header tells us where the
3691 external symbols start. We don't care about the local symbols at
3693 if (elf_bad_symtab (abfd))
3695 extsymcount = symcount;
3700 extsymcount = symcount - hdr->sh_info;
3701 extsymoff = hdr->sh_info;
3705 if (extsymcount != 0)
3707 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3709 if (isymbuf == NULL)
3712 /* We store a pointer to the hash table entry for each external
3714 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3715 sym_hash = (struct elf_link_hash_entry **) bfd_alloc (abfd, amt);
3716 if (sym_hash == NULL)
3717 goto error_free_sym;
3718 elf_sym_hashes (abfd) = sym_hash;
3723 /* Read in any version definitions. */
3724 if (!_bfd_elf_slurp_version_tables (abfd,
3725 info->default_imported_symver))
3726 goto error_free_sym;
3728 /* Read in the symbol versions, but don't bother to convert them
3729 to internal format. */
3730 if (elf_dynversym (abfd) != 0)
3732 Elf_Internal_Shdr *versymhdr;
3734 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3735 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3736 if (extversym == NULL)
3737 goto error_free_sym;
3738 amt = versymhdr->sh_size;
3739 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3740 || bfd_bread (extversym, amt, abfd) != amt)
3741 goto error_free_vers;
3745 /* If we are loading an as-needed shared lib, save the symbol table
3746 state before we start adding symbols. If the lib turns out
3747 to be unneeded, restore the state. */
3748 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3753 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3755 struct bfd_hash_entry *p;
3756 struct elf_link_hash_entry *h;
3758 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3760 h = (struct elf_link_hash_entry *) p;
3761 entsize += htab->root.table.entsize;
3762 if (h->root.type == bfd_link_hash_warning)
3763 entsize += htab->root.table.entsize;
3767 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3768 hashsize = extsymcount * sizeof (struct elf_link_hash_entry *);
3769 old_tab = bfd_malloc (tabsize + entsize + hashsize);
3770 if (old_tab == NULL)
3771 goto error_free_vers;
3773 /* Remember the current objalloc pointer, so that all mem for
3774 symbols added can later be reclaimed. */
3775 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3776 if (alloc_mark == NULL)
3777 goto error_free_vers;
3779 /* Make a special call to the linker "notice" function to
3780 tell it that we are about to handle an as-needed lib. */
3781 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
3782 notice_as_needed, 0, NULL))
3783 goto error_free_vers;
3785 /* Clone the symbol table and sym hashes. Remember some
3786 pointers into the symbol table, and dynamic symbol count. */
3787 old_hash = (char *) old_tab + tabsize;
3788 old_ent = (char *) old_hash + hashsize;
3789 memcpy (old_tab, htab->root.table.table, tabsize);
3790 memcpy (old_hash, sym_hash, hashsize);
3791 old_undefs = htab->root.undefs;
3792 old_undefs_tail = htab->root.undefs_tail;
3793 old_table = htab->root.table.table;
3794 old_size = htab->root.table.size;
3795 old_count = htab->root.table.count;
3796 old_dynsymcount = htab->dynsymcount;
3797 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
3799 for (i = 0; i < htab->root.table.size; i++)
3801 struct bfd_hash_entry *p;
3802 struct elf_link_hash_entry *h;
3804 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3806 memcpy (old_ent, p, htab->root.table.entsize);
3807 old_ent = (char *) old_ent + htab->root.table.entsize;
3808 h = (struct elf_link_hash_entry *) p;
3809 if (h->root.type == bfd_link_hash_warning)
3811 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3812 old_ent = (char *) old_ent + htab->root.table.entsize;
3819 ever = extversym != NULL ? extversym + extsymoff : NULL;
3820 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3822 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3826 asection *sec, *new_sec;
3829 struct elf_link_hash_entry *h;
3830 struct elf_link_hash_entry *hi;
3831 bfd_boolean definition;
3832 bfd_boolean size_change_ok;
3833 bfd_boolean type_change_ok;
3834 bfd_boolean new_weakdef;
3835 bfd_boolean new_weak;
3836 bfd_boolean old_weak;
3837 bfd_boolean override;
3839 unsigned int old_alignment;
3844 flags = BSF_NO_FLAGS;
3846 value = isym->st_value;
3848 common = bed->common_definition (isym);
3850 bind = ELF_ST_BIND (isym->st_info);
3854 /* This should be impossible, since ELF requires that all
3855 global symbols follow all local symbols, and that sh_info
3856 point to the first global symbol. Unfortunately, Irix 5
3861 if (isym->st_shndx != SHN_UNDEF && !common)
3869 case STB_GNU_UNIQUE:
3870 flags = BSF_GNU_UNIQUE;
3874 /* Leave it up to the processor backend. */
3878 if (isym->st_shndx == SHN_UNDEF)
3879 sec = bfd_und_section_ptr;
3880 else if (isym->st_shndx == SHN_ABS)
3881 sec = bfd_abs_section_ptr;
3882 else if (isym->st_shndx == SHN_COMMON)
3884 sec = bfd_com_section_ptr;
3885 /* What ELF calls the size we call the value. What ELF
3886 calls the value we call the alignment. */
3887 value = isym->st_size;
3891 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3893 sec = bfd_abs_section_ptr;
3894 else if (discarded_section (sec))
3896 /* Symbols from discarded section are undefined. We keep
3898 sec = bfd_und_section_ptr;
3899 isym->st_shndx = SHN_UNDEF;
3901 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3905 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3908 goto error_free_vers;
3910 if (isym->st_shndx == SHN_COMMON
3911 && (abfd->flags & BFD_PLUGIN) != 0)
3913 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
3917 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
3919 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
3921 goto error_free_vers;
3925 else if (isym->st_shndx == SHN_COMMON
3926 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3927 && !info->relocatable)
3929 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3933 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
3934 | SEC_LINKER_CREATED);
3935 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
3937 goto error_free_vers;
3941 else if (bed->elf_add_symbol_hook)
3943 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3945 goto error_free_vers;
3947 /* The hook function sets the name to NULL if this symbol
3948 should be skipped for some reason. */
3953 /* Sanity check that all possibilities were handled. */
3956 bfd_set_error (bfd_error_bad_value);
3957 goto error_free_vers;
3960 /* Silently discard TLS symbols from --just-syms. There's
3961 no way to combine a static TLS block with a new TLS block
3962 for this executable. */
3963 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
3964 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3967 if (bfd_is_und_section (sec)
3968 || bfd_is_com_section (sec))
3973 size_change_ok = FALSE;
3974 type_change_ok = bed->type_change_ok;
3980 if (is_elf_hash_table (htab))
3982 Elf_Internal_Versym iver;
3983 unsigned int vernum = 0;
3988 if (info->default_imported_symver)
3989 /* Use the default symbol version created earlier. */
3990 iver.vs_vers = elf_tdata (abfd)->cverdefs;
3995 _bfd_elf_swap_versym_in (abfd, ever, &iver);
3997 vernum = iver.vs_vers & VERSYM_VERSION;
3999 /* If this is a hidden symbol, or if it is not version
4000 1, we append the version name to the symbol name.
4001 However, we do not modify a non-hidden absolute symbol
4002 if it is not a function, because it might be the version
4003 symbol itself. FIXME: What if it isn't? */
4004 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4006 && (!bfd_is_abs_section (sec)
4007 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4010 size_t namelen, verlen, newlen;
4013 if (isym->st_shndx != SHN_UNDEF)
4015 if (vernum > elf_tdata (abfd)->cverdefs)
4017 else if (vernum > 1)
4019 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4025 (*_bfd_error_handler)
4026 (_("%B: %s: invalid version %u (max %d)"),
4028 elf_tdata (abfd)->cverdefs);
4029 bfd_set_error (bfd_error_bad_value);
4030 goto error_free_vers;
4035 /* We cannot simply test for the number of
4036 entries in the VERNEED section since the
4037 numbers for the needed versions do not start
4039 Elf_Internal_Verneed *t;
4042 for (t = elf_tdata (abfd)->verref;
4046 Elf_Internal_Vernaux *a;
4048 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4050 if (a->vna_other == vernum)
4052 verstr = a->vna_nodename;
4061 (*_bfd_error_handler)
4062 (_("%B: %s: invalid needed version %d"),
4063 abfd, name, vernum);
4064 bfd_set_error (bfd_error_bad_value);
4065 goto error_free_vers;
4069 namelen = strlen (name);
4070 verlen = strlen (verstr);
4071 newlen = namelen + verlen + 2;
4072 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4073 && isym->st_shndx != SHN_UNDEF)
4076 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4077 if (newname == NULL)
4078 goto error_free_vers;
4079 memcpy (newname, name, namelen);
4080 p = newname + namelen;
4082 /* If this is a defined non-hidden version symbol,
4083 we add another @ to the name. This indicates the
4084 default version of the symbol. */
4085 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4086 && isym->st_shndx != SHN_UNDEF)
4088 memcpy (p, verstr, verlen + 1);
4093 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4094 sym_hash, &old_bfd, &old_weak,
4095 &old_alignment, &skip, &override,
4096 &type_change_ok, &size_change_ok))
4097 goto error_free_vers;
4106 while (h->root.type == bfd_link_hash_indirect
4107 || h->root.type == bfd_link_hash_warning)
4108 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4110 if (elf_tdata (abfd)->verdef != NULL
4113 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4116 if (! (_bfd_generic_link_add_one_symbol
4117 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4118 (struct bfd_link_hash_entry **) sym_hash)))
4119 goto error_free_vers;
4122 /* We need to make sure that indirect symbol dynamic flags are
4125 while (h->root.type == bfd_link_hash_indirect
4126 || h->root.type == bfd_link_hash_warning)
4127 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4131 new_weak = (flags & BSF_WEAK) != 0;
4132 new_weakdef = FALSE;
4136 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4137 && is_elf_hash_table (htab)
4138 && h->u.weakdef == NULL)
4140 /* Keep a list of all weak defined non function symbols from
4141 a dynamic object, using the weakdef field. Later in this
4142 function we will set the weakdef field to the correct
4143 value. We only put non-function symbols from dynamic
4144 objects on this list, because that happens to be the only
4145 time we need to know the normal symbol corresponding to a
4146 weak symbol, and the information is time consuming to
4147 figure out. If the weakdef field is not already NULL,
4148 then this symbol was already defined by some previous
4149 dynamic object, and we will be using that previous
4150 definition anyhow. */
4152 h->u.weakdef = weaks;
4157 /* Set the alignment of a common symbol. */
4158 if ((common || bfd_is_com_section (sec))
4159 && h->root.type == bfd_link_hash_common)
4164 align = bfd_log2 (isym->st_value);
4167 /* The new symbol is a common symbol in a shared object.
4168 We need to get the alignment from the section. */
4169 align = new_sec->alignment_power;
4171 if (align > old_alignment)
4172 h->root.u.c.p->alignment_power = align;
4174 h->root.u.c.p->alignment_power = old_alignment;
4177 if (is_elf_hash_table (htab))
4179 /* Set a flag in the hash table entry indicating the type of
4180 reference or definition we just found. A dynamic symbol
4181 is one which is referenced or defined by both a regular
4182 object and a shared object. */
4183 bfd_boolean dynsym = FALSE;
4185 /* Plugin symbols aren't normal. Don't set def_regular or
4186 ref_regular for them, or make them dynamic. */
4187 if ((abfd->flags & BFD_PLUGIN) != 0)
4194 if (bind != STB_WEAK)
4195 h->ref_regular_nonweak = 1;
4207 /* If the indirect symbol has been forced local, don't
4208 make the real symbol dynamic. */
4209 if ((h == hi || !hi->forced_local)
4210 && (! info->executable
4220 hi->ref_dynamic = 1;
4225 hi->def_dynamic = 1;
4228 /* If the indirect symbol has been forced local, don't
4229 make the real symbol dynamic. */
4230 if ((h == hi || !hi->forced_local)
4233 || (h->u.weakdef != NULL
4235 && h->u.weakdef->dynindx != -1)))
4239 /* Check to see if we need to add an indirect symbol for
4240 the default name. */
4242 || (!override && h->root.type == bfd_link_hash_common))
4243 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4244 sec, value, &old_bfd, &dynsym))
4245 goto error_free_vers;
4247 /* Check the alignment when a common symbol is involved. This
4248 can change when a common symbol is overridden by a normal
4249 definition or a common symbol is ignored due to the old
4250 normal definition. We need to make sure the maximum
4251 alignment is maintained. */
4252 if ((old_alignment || common)
4253 && h->root.type != bfd_link_hash_common)
4255 unsigned int common_align;
4256 unsigned int normal_align;
4257 unsigned int symbol_align;
4261 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4262 || h->root.type == bfd_link_hash_defweak);
4264 symbol_align = ffs (h->root.u.def.value) - 1;
4265 if (h->root.u.def.section->owner != NULL
4266 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4268 normal_align = h->root.u.def.section->alignment_power;
4269 if (normal_align > symbol_align)
4270 normal_align = symbol_align;
4273 normal_align = symbol_align;
4277 common_align = old_alignment;
4278 common_bfd = old_bfd;
4283 common_align = bfd_log2 (isym->st_value);
4285 normal_bfd = old_bfd;
4288 if (normal_align < common_align)
4290 /* PR binutils/2735 */
4291 if (normal_bfd == NULL)
4292 (*_bfd_error_handler)
4293 (_("Warning: alignment %u of common symbol `%s' in %B is"
4294 " greater than the alignment (%u) of its section %A"),
4295 common_bfd, h->root.u.def.section,
4296 1 << common_align, name, 1 << normal_align);
4298 (*_bfd_error_handler)
4299 (_("Warning: alignment %u of symbol `%s' in %B"
4300 " is smaller than %u in %B"),
4301 normal_bfd, common_bfd,
4302 1 << normal_align, name, 1 << common_align);
4306 /* Remember the symbol size if it isn't undefined. */
4307 if (isym->st_size != 0
4308 && isym->st_shndx != SHN_UNDEF
4309 && (definition || h->size == 0))
4312 && h->size != isym->st_size
4313 && ! size_change_ok)
4314 (*_bfd_error_handler)
4315 (_("Warning: size of symbol `%s' changed"
4316 " from %lu in %B to %lu in %B"),
4318 name, (unsigned long) h->size,
4319 (unsigned long) isym->st_size);
4321 h->size = isym->st_size;
4324 /* If this is a common symbol, then we always want H->SIZE
4325 to be the size of the common symbol. The code just above
4326 won't fix the size if a common symbol becomes larger. We
4327 don't warn about a size change here, because that is
4328 covered by --warn-common. Allow changes between different
4330 if (h->root.type == bfd_link_hash_common)
4331 h->size = h->root.u.c.size;
4333 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4334 && ((definition && !new_weak)
4335 || (old_weak && h->root.type == bfd_link_hash_common)
4336 || h->type == STT_NOTYPE))
4338 unsigned int type = ELF_ST_TYPE (isym->st_info);
4340 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4342 if (type == STT_GNU_IFUNC
4343 && (abfd->flags & DYNAMIC) != 0)
4346 if (h->type != type)
4348 if (h->type != STT_NOTYPE && ! type_change_ok)
4349 (*_bfd_error_handler)
4350 (_("Warning: type of symbol `%s' changed"
4351 " from %d to %d in %B"),
4352 abfd, name, h->type, type);
4358 /* Merge st_other field. */
4359 elf_merge_st_other (abfd, h, isym, definition, dynamic);
4361 /* We don't want to make debug symbol dynamic. */
4362 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4365 /* Nor should we make plugin symbols dynamic. */
4366 if ((abfd->flags & BFD_PLUGIN) != 0)
4371 h->target_internal = isym->st_target_internal;
4372 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4375 if (definition && !dynamic)
4377 char *p = strchr (name, ELF_VER_CHR);
4378 if (p != NULL && p[1] != ELF_VER_CHR)
4380 /* Queue non-default versions so that .symver x, x@FOO
4381 aliases can be checked. */
4384 amt = ((isymend - isym + 1)
4385 * sizeof (struct elf_link_hash_entry *));
4387 (struct elf_link_hash_entry **) bfd_malloc (amt);
4389 goto error_free_vers;
4391 nondeflt_vers[nondeflt_vers_cnt++] = h;
4395 if (dynsym && h->dynindx == -1)
4397 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4398 goto error_free_vers;
4399 if (h->u.weakdef != NULL
4401 && h->u.weakdef->dynindx == -1)
4403 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4404 goto error_free_vers;
4407 else if (dynsym && h->dynindx != -1)
4408 /* If the symbol already has a dynamic index, but
4409 visibility says it should not be visible, turn it into
4411 switch (ELF_ST_VISIBILITY (h->other))
4415 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4420 /* Don't add DT_NEEDED for references from the dummy bfd. */
4424 && h->ref_regular_nonweak
4426 || (old_bfd->flags & BFD_PLUGIN) == 0))
4427 || (h->ref_dynamic_nonweak
4428 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4429 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4432 const char *soname = elf_dt_name (abfd);
4434 /* A symbol from a library loaded via DT_NEEDED of some
4435 other library is referenced by a regular object.
4436 Add a DT_NEEDED entry for it. Issue an error if
4437 --no-add-needed is used and the reference was not
4440 && h->ref_regular_nonweak
4441 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4443 (*_bfd_error_handler)
4444 (_("%B: undefined reference to symbol '%s'"),
4446 (*_bfd_error_handler)
4447 (_("note: '%s' is defined in DSO %B"
4448 " so try adding it to the linker command line"),
4450 bfd_set_error (bfd_error_invalid_operation);
4451 goto error_free_vers;
4454 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4455 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4458 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4460 goto error_free_vers;
4462 BFD_ASSERT (ret == 0);
4467 if (extversym != NULL)
4473 if (isymbuf != NULL)
4479 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4483 /* Restore the symbol table. */
4484 if (bed->as_needed_cleanup)
4485 (*bed->as_needed_cleanup) (abfd, info);
4486 old_hash = (char *) old_tab + tabsize;
4487 old_ent = (char *) old_hash + hashsize;
4488 sym_hash = elf_sym_hashes (abfd);
4489 htab->root.table.table = old_table;
4490 htab->root.table.size = old_size;
4491 htab->root.table.count = old_count;
4492 memcpy (htab->root.table.table, old_tab, tabsize);
4493 memcpy (sym_hash, old_hash, hashsize);
4494 htab->root.undefs = old_undefs;
4495 htab->root.undefs_tail = old_undefs_tail;
4496 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4497 for (i = 0; i < htab->root.table.size; i++)
4499 struct bfd_hash_entry *p;
4500 struct elf_link_hash_entry *h;
4502 unsigned int alignment_power;
4504 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4506 h = (struct elf_link_hash_entry *) p;
4507 if (h->root.type == bfd_link_hash_warning)
4508 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4509 if (h->dynindx >= old_dynsymcount
4510 && h->dynstr_index < old_dynstr_size)
4511 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4513 /* Preserve the maximum alignment and size for common
4514 symbols even if this dynamic lib isn't on DT_NEEDED
4515 since it can still be loaded at run time by another
4517 if (h->root.type == bfd_link_hash_common)
4519 size = h->root.u.c.size;
4520 alignment_power = h->root.u.c.p->alignment_power;
4525 alignment_power = 0;
4527 memcpy (p, old_ent, htab->root.table.entsize);
4528 old_ent = (char *) old_ent + htab->root.table.entsize;
4529 h = (struct elf_link_hash_entry *) p;
4530 if (h->root.type == bfd_link_hash_warning)
4532 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4533 old_ent = (char *) old_ent + htab->root.table.entsize;
4534 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4536 if (h->root.type == bfd_link_hash_common)
4538 if (size > h->root.u.c.size)
4539 h->root.u.c.size = size;
4540 if (alignment_power > h->root.u.c.p->alignment_power)
4541 h->root.u.c.p->alignment_power = alignment_power;
4546 /* Make a special call to the linker "notice" function to
4547 tell it that symbols added for crefs may need to be removed. */
4548 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4549 notice_not_needed, 0, NULL))
4550 goto error_free_vers;
4553 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4555 if (nondeflt_vers != NULL)
4556 free (nondeflt_vers);
4560 if (old_tab != NULL)
4562 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4563 notice_needed, 0, NULL))
4564 goto error_free_vers;
4569 /* Now that all the symbols from this input file are created, handle
4570 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4571 if (nondeflt_vers != NULL)
4573 bfd_size_type cnt, symidx;
4575 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4577 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4578 char *shortname, *p;
4580 p = strchr (h->root.root.string, ELF_VER_CHR);
4582 || (h->root.type != bfd_link_hash_defined
4583 && h->root.type != bfd_link_hash_defweak))
4586 amt = p - h->root.root.string;
4587 shortname = (char *) bfd_malloc (amt + 1);
4589 goto error_free_vers;
4590 memcpy (shortname, h->root.root.string, amt);
4591 shortname[amt] = '\0';
4593 hi = (struct elf_link_hash_entry *)
4594 bfd_link_hash_lookup (&htab->root, shortname,
4595 FALSE, FALSE, FALSE);
4597 && hi->root.type == h->root.type
4598 && hi->root.u.def.value == h->root.u.def.value
4599 && hi->root.u.def.section == h->root.u.def.section)
4601 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4602 hi->root.type = bfd_link_hash_indirect;
4603 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4604 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4605 sym_hash = elf_sym_hashes (abfd);
4607 for (symidx = 0; symidx < extsymcount; ++symidx)
4608 if (sym_hash[symidx] == hi)
4610 sym_hash[symidx] = h;
4616 free (nondeflt_vers);
4617 nondeflt_vers = NULL;
4620 /* Now set the weakdefs field correctly for all the weak defined
4621 symbols we found. The only way to do this is to search all the
4622 symbols. Since we only need the information for non functions in
4623 dynamic objects, that's the only time we actually put anything on
4624 the list WEAKS. We need this information so that if a regular
4625 object refers to a symbol defined weakly in a dynamic object, the
4626 real symbol in the dynamic object is also put in the dynamic
4627 symbols; we also must arrange for both symbols to point to the
4628 same memory location. We could handle the general case of symbol
4629 aliasing, but a general symbol alias can only be generated in
4630 assembler code, handling it correctly would be very time
4631 consuming, and other ELF linkers don't handle general aliasing
4635 struct elf_link_hash_entry **hpp;
4636 struct elf_link_hash_entry **hppend;
4637 struct elf_link_hash_entry **sorted_sym_hash;
4638 struct elf_link_hash_entry *h;
4641 /* Since we have to search the whole symbol list for each weak
4642 defined symbol, search time for N weak defined symbols will be
4643 O(N^2). Binary search will cut it down to O(NlogN). */
4644 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4645 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4646 if (sorted_sym_hash == NULL)
4648 sym_hash = sorted_sym_hash;
4649 hpp = elf_sym_hashes (abfd);
4650 hppend = hpp + extsymcount;
4652 for (; hpp < hppend; hpp++)
4656 && h->root.type == bfd_link_hash_defined
4657 && !bed->is_function_type (h->type))
4665 qsort (sorted_sym_hash, sym_count,
4666 sizeof (struct elf_link_hash_entry *),
4669 while (weaks != NULL)
4671 struct elf_link_hash_entry *hlook;
4677 weaks = hlook->u.weakdef;
4678 hlook->u.weakdef = NULL;
4680 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4681 || hlook->root.type == bfd_link_hash_defweak
4682 || hlook->root.type == bfd_link_hash_common
4683 || hlook->root.type == bfd_link_hash_indirect);
4684 slook = hlook->root.u.def.section;
4685 vlook = hlook->root.u.def.value;
4691 bfd_signed_vma vdiff;
4693 h = sorted_sym_hash[idx];
4694 vdiff = vlook - h->root.u.def.value;
4701 long sdiff = slook->id - h->root.u.def.section->id;
4711 /* We didn't find a value/section match. */
4715 /* With multiple aliases, or when the weak symbol is already
4716 strongly defined, we have multiple matching symbols and
4717 the binary search above may land on any of them. Step
4718 one past the matching symbol(s). */
4721 h = sorted_sym_hash[idx];
4722 if (h->root.u.def.section != slook
4723 || h->root.u.def.value != vlook)
4727 /* Now look back over the aliases. Since we sorted by size
4728 as well as value and section, we'll choose the one with
4729 the largest size. */
4732 h = sorted_sym_hash[idx];
4734 /* Stop if value or section doesn't match. */
4735 if (h->root.u.def.section != slook
4736 || h->root.u.def.value != vlook)
4738 else if (h != hlook)
4740 hlook->u.weakdef = h;
4742 /* If the weak definition is in the list of dynamic
4743 symbols, make sure the real definition is put
4745 if (hlook->dynindx != -1 && h->dynindx == -1)
4747 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4750 free (sorted_sym_hash);
4755 /* If the real definition is in the list of dynamic
4756 symbols, make sure the weak definition is put
4757 there as well. If we don't do this, then the
4758 dynamic loader might not merge the entries for the
4759 real definition and the weak definition. */
4760 if (h->dynindx != -1 && hlook->dynindx == -1)
4762 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4763 goto err_free_sym_hash;
4770 free (sorted_sym_hash);
4773 if (bed->check_directives
4774 && !(*bed->check_directives) (abfd, info))
4777 /* If this object is the same format as the output object, and it is
4778 not a shared library, then let the backend look through the
4781 This is required to build global offset table entries and to
4782 arrange for dynamic relocs. It is not required for the
4783 particular common case of linking non PIC code, even when linking
4784 against shared libraries, but unfortunately there is no way of
4785 knowing whether an object file has been compiled PIC or not.
4786 Looking through the relocs is not particularly time consuming.
4787 The problem is that we must either (1) keep the relocs in memory,
4788 which causes the linker to require additional runtime memory or
4789 (2) read the relocs twice from the input file, which wastes time.
4790 This would be a good case for using mmap.
4792 I have no idea how to handle linking PIC code into a file of a
4793 different format. It probably can't be done. */
4795 && is_elf_hash_table (htab)
4796 && bed->check_relocs != NULL
4797 && elf_object_id (abfd) == elf_hash_table_id (htab)
4798 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4802 for (o = abfd->sections; o != NULL; o = o->next)
4804 Elf_Internal_Rela *internal_relocs;
4807 if ((o->flags & SEC_RELOC) == 0
4808 || o->reloc_count == 0
4809 || ((info->strip == strip_all || info->strip == strip_debugger)
4810 && (o->flags & SEC_DEBUGGING) != 0)
4811 || bfd_is_abs_section (o->output_section))
4814 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4816 if (internal_relocs == NULL)
4819 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4821 if (elf_section_data (o)->relocs != internal_relocs)
4822 free (internal_relocs);
4829 /* If this is a non-traditional link, try to optimize the handling
4830 of the .stab/.stabstr sections. */
4832 && ! info->traditional_format
4833 && is_elf_hash_table (htab)
4834 && (info->strip != strip_all && info->strip != strip_debugger))
4838 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4839 if (stabstr != NULL)
4841 bfd_size_type string_offset = 0;
4844 for (stab = abfd->sections; stab; stab = stab->next)
4845 if (CONST_STRNEQ (stab->name, ".stab")
4846 && (!stab->name[5] ||
4847 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4848 && (stab->flags & SEC_MERGE) == 0
4849 && !bfd_is_abs_section (stab->output_section))
4851 struct bfd_elf_section_data *secdata;
4853 secdata = elf_section_data (stab);
4854 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4855 stabstr, &secdata->sec_info,
4858 if (secdata->sec_info)
4859 stab->sec_info_type = SEC_INFO_TYPE_STABS;
4864 if (is_elf_hash_table (htab) && add_needed)
4866 /* Add this bfd to the loaded list. */
4867 struct elf_link_loaded_list *n;
4869 n = (struct elf_link_loaded_list *)
4870 bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4874 n->next = htab->loaded;
4881 if (old_tab != NULL)
4883 if (nondeflt_vers != NULL)
4884 free (nondeflt_vers);
4885 if (extversym != NULL)
4888 if (isymbuf != NULL)
4894 /* Return the linker hash table entry of a symbol that might be
4895 satisfied by an archive symbol. Return -1 on error. */
4897 struct elf_link_hash_entry *
4898 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4899 struct bfd_link_info *info,
4902 struct elf_link_hash_entry *h;
4906 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
4910 /* If this is a default version (the name contains @@), look up the
4911 symbol again with only one `@' as well as without the version.
4912 The effect is that references to the symbol with and without the
4913 version will be matched by the default symbol in the archive. */
4915 p = strchr (name, ELF_VER_CHR);
4916 if (p == NULL || p[1] != ELF_VER_CHR)
4919 /* First check with only one `@'. */
4920 len = strlen (name);
4921 copy = (char *) bfd_alloc (abfd, len);
4923 return (struct elf_link_hash_entry *) 0 - 1;
4925 first = p - name + 1;
4926 memcpy (copy, name, first);
4927 memcpy (copy + first, name + first + 1, len - first);
4929 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
4932 /* We also need to check references to the symbol without the
4934 copy[first - 1] = '\0';
4935 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4936 FALSE, FALSE, TRUE);
4939 bfd_release (abfd, copy);
4943 /* Add symbols from an ELF archive file to the linker hash table. We
4944 don't use _bfd_generic_link_add_archive_symbols because of a
4945 problem which arises on UnixWare. The UnixWare libc.so is an
4946 archive which includes an entry libc.so.1 which defines a bunch of
4947 symbols. The libc.so archive also includes a number of other
4948 object files, which also define symbols, some of which are the same
4949 as those defined in libc.so.1. Correct linking requires that we
4950 consider each object file in turn, and include it if it defines any
4951 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4952 this; it looks through the list of undefined symbols, and includes
4953 any object file which defines them. When this algorithm is used on
4954 UnixWare, it winds up pulling in libc.so.1 early and defining a
4955 bunch of symbols. This means that some of the other objects in the
4956 archive are not included in the link, which is incorrect since they
4957 precede libc.so.1 in the archive.
4959 Fortunately, ELF archive handling is simpler than that done by
4960 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4961 oddities. In ELF, if we find a symbol in the archive map, and the
4962 symbol is currently undefined, we know that we must pull in that
4965 Unfortunately, we do have to make multiple passes over the symbol
4966 table until nothing further is resolved. */
4969 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4972 bfd_boolean *defined = NULL;
4973 bfd_boolean *included = NULL;
4977 const struct elf_backend_data *bed;
4978 struct elf_link_hash_entry * (*archive_symbol_lookup)
4979 (bfd *, struct bfd_link_info *, const char *);
4981 if (! bfd_has_map (abfd))
4983 /* An empty archive is a special case. */
4984 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4986 bfd_set_error (bfd_error_no_armap);
4990 /* Keep track of all symbols we know to be already defined, and all
4991 files we know to be already included. This is to speed up the
4992 second and subsequent passes. */
4993 c = bfd_ardata (abfd)->symdef_count;
4997 amt *= sizeof (bfd_boolean);
4998 defined = (bfd_boolean *) bfd_zmalloc (amt);
4999 included = (bfd_boolean *) bfd_zmalloc (amt);
5000 if (defined == NULL || included == NULL)
5003 symdefs = bfd_ardata (abfd)->symdefs;
5004 bed = get_elf_backend_data (abfd);
5005 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5018 symdefend = symdef + c;
5019 for (i = 0; symdef < symdefend; symdef++, i++)
5021 struct elf_link_hash_entry *h;
5023 struct bfd_link_hash_entry *undefs_tail;
5026 if (defined[i] || included[i])
5028 if (symdef->file_offset == last)
5034 h = archive_symbol_lookup (abfd, info, symdef->name);
5035 if (h == (struct elf_link_hash_entry *) 0 - 1)
5041 if (h->root.type == bfd_link_hash_common)
5043 /* We currently have a common symbol. The archive map contains
5044 a reference to this symbol, so we may want to include it. We
5045 only want to include it however, if this archive element
5046 contains a definition of the symbol, not just another common
5049 Unfortunately some archivers (including GNU ar) will put
5050 declarations of common symbols into their archive maps, as
5051 well as real definitions, so we cannot just go by the archive
5052 map alone. Instead we must read in the element's symbol
5053 table and check that to see what kind of symbol definition
5055 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5058 else if (h->root.type != bfd_link_hash_undefined)
5060 if (h->root.type != bfd_link_hash_undefweak)
5065 /* We need to include this archive member. */
5066 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5067 if (element == NULL)
5070 if (! bfd_check_format (element, bfd_object))
5073 /* Doublecheck that we have not included this object
5074 already--it should be impossible, but there may be
5075 something wrong with the archive. */
5076 if (element->archive_pass != 0)
5078 bfd_set_error (bfd_error_bad_value);
5081 element->archive_pass = 1;
5083 undefs_tail = info->hash->undefs_tail;
5085 if (!(*info->callbacks
5086 ->add_archive_element) (info, element, symdef->name, &element))
5088 if (!bfd_link_add_symbols (element, info))
5091 /* If there are any new undefined symbols, we need to make
5092 another pass through the archive in order to see whether
5093 they can be defined. FIXME: This isn't perfect, because
5094 common symbols wind up on undefs_tail and because an
5095 undefined symbol which is defined later on in this pass
5096 does not require another pass. This isn't a bug, but it
5097 does make the code less efficient than it could be. */
5098 if (undefs_tail != info->hash->undefs_tail)
5101 /* Look backward to mark all symbols from this object file
5102 which we have already seen in this pass. */
5106 included[mark] = TRUE;
5111 while (symdefs[mark].file_offset == symdef->file_offset);
5113 /* We mark subsequent symbols from this object file as we go
5114 on through the loop. */
5115 last = symdef->file_offset;
5126 if (defined != NULL)
5128 if (included != NULL)
5133 /* Given an ELF BFD, add symbols to the global hash table as
5137 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5139 switch (bfd_get_format (abfd))
5142 return elf_link_add_object_symbols (abfd, info);
5144 return elf_link_add_archive_symbols (abfd, info);
5146 bfd_set_error (bfd_error_wrong_format);
5151 struct hash_codes_info
5153 unsigned long *hashcodes;
5157 /* This function will be called though elf_link_hash_traverse to store
5158 all hash value of the exported symbols in an array. */
5161 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5163 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5169 /* Ignore indirect symbols. These are added by the versioning code. */
5170 if (h->dynindx == -1)
5173 name = h->root.root.string;
5174 p = strchr (name, ELF_VER_CHR);
5177 alc = (char *) bfd_malloc (p - name + 1);
5183 memcpy (alc, name, p - name);
5184 alc[p - name] = '\0';
5188 /* Compute the hash value. */
5189 ha = bfd_elf_hash (name);
5191 /* Store the found hash value in the array given as the argument. */
5192 *(inf->hashcodes)++ = ha;
5194 /* And store it in the struct so that we can put it in the hash table
5196 h->u.elf_hash_value = ha;
5204 struct collect_gnu_hash_codes
5207 const struct elf_backend_data *bed;
5208 unsigned long int nsyms;
5209 unsigned long int maskbits;
5210 unsigned long int *hashcodes;
5211 unsigned long int *hashval;
5212 unsigned long int *indx;
5213 unsigned long int *counts;
5216 long int min_dynindx;
5217 unsigned long int bucketcount;
5218 unsigned long int symindx;
5219 long int local_indx;
5220 long int shift1, shift2;
5221 unsigned long int mask;
5225 /* This function will be called though elf_link_hash_traverse to store
5226 all hash value of the exported symbols in an array. */
5229 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5231 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5237 /* Ignore indirect symbols. These are added by the versioning code. */
5238 if (h->dynindx == -1)
5241 /* Ignore also local symbols and undefined symbols. */
5242 if (! (*s->bed->elf_hash_symbol) (h))
5245 name = h->root.root.string;
5246 p = strchr (name, ELF_VER_CHR);
5249 alc = (char *) bfd_malloc (p - name + 1);
5255 memcpy (alc, name, p - name);
5256 alc[p - name] = '\0';
5260 /* Compute the hash value. */
5261 ha = bfd_elf_gnu_hash (name);
5263 /* Store the found hash value in the array for compute_bucket_count,
5264 and also for .dynsym reordering purposes. */
5265 s->hashcodes[s->nsyms] = ha;
5266 s->hashval[h->dynindx] = ha;
5268 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5269 s->min_dynindx = h->dynindx;
5277 /* This function will be called though elf_link_hash_traverse to do
5278 final dynaminc symbol renumbering. */
5281 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5283 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5284 unsigned long int bucket;
5285 unsigned long int val;
5287 /* Ignore indirect symbols. */
5288 if (h->dynindx == -1)
5291 /* Ignore also local symbols and undefined symbols. */
5292 if (! (*s->bed->elf_hash_symbol) (h))
5294 if (h->dynindx >= s->min_dynindx)
5295 h->dynindx = s->local_indx++;
5299 bucket = s->hashval[h->dynindx] % s->bucketcount;
5300 val = (s->hashval[h->dynindx] >> s->shift1)
5301 & ((s->maskbits >> s->shift1) - 1);
5302 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5304 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5305 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5306 if (s->counts[bucket] == 1)
5307 /* Last element terminates the chain. */
5309 bfd_put_32 (s->output_bfd, val,
5310 s->contents + (s->indx[bucket] - s->symindx) * 4);
5311 --s->counts[bucket];
5312 h->dynindx = s->indx[bucket]++;
5316 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5319 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5321 return !(h->forced_local
5322 || h->root.type == bfd_link_hash_undefined
5323 || h->root.type == bfd_link_hash_undefweak
5324 || ((h->root.type == bfd_link_hash_defined
5325 || h->root.type == bfd_link_hash_defweak)
5326 && h->root.u.def.section->output_section == NULL));
5329 /* Array used to determine the number of hash table buckets to use
5330 based on the number of symbols there are. If there are fewer than
5331 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5332 fewer than 37 we use 17 buckets, and so forth. We never use more
5333 than 32771 buckets. */
5335 static const size_t elf_buckets[] =
5337 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5341 /* Compute bucket count for hashing table. We do not use a static set
5342 of possible tables sizes anymore. Instead we determine for all
5343 possible reasonable sizes of the table the outcome (i.e., the
5344 number of collisions etc) and choose the best solution. The
5345 weighting functions are not too simple to allow the table to grow
5346 without bounds. Instead one of the weighting factors is the size.
5347 Therefore the result is always a good payoff between few collisions
5348 (= short chain lengths) and table size. */
5350 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5351 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5352 unsigned long int nsyms,
5355 size_t best_size = 0;
5356 unsigned long int i;
5358 /* We have a problem here. The following code to optimize the table
5359 size requires an integer type with more the 32 bits. If
5360 BFD_HOST_U_64_BIT is set we know about such a type. */
5361 #ifdef BFD_HOST_U_64_BIT
5366 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5367 bfd *dynobj = elf_hash_table (info)->dynobj;
5368 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5369 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5370 unsigned long int *counts;
5372 unsigned int no_improvement_count = 0;
5374 /* Possible optimization parameters: if we have NSYMS symbols we say
5375 that the hashing table must at least have NSYMS/4 and at most
5377 minsize = nsyms / 4;
5380 best_size = maxsize = nsyms * 2;
5385 if ((best_size & 31) == 0)
5389 /* Create array where we count the collisions in. We must use bfd_malloc
5390 since the size could be large. */
5392 amt *= sizeof (unsigned long int);
5393 counts = (unsigned long int *) bfd_malloc (amt);
5397 /* Compute the "optimal" size for the hash table. The criteria is a
5398 minimal chain length. The minor criteria is (of course) the size
5400 for (i = minsize; i < maxsize; ++i)
5402 /* Walk through the array of hashcodes and count the collisions. */
5403 BFD_HOST_U_64_BIT max;
5404 unsigned long int j;
5405 unsigned long int fact;
5407 if (gnu_hash && (i & 31) == 0)
5410 memset (counts, '\0', i * sizeof (unsigned long int));
5412 /* Determine how often each hash bucket is used. */
5413 for (j = 0; j < nsyms; ++j)
5414 ++counts[hashcodes[j] % i];
5416 /* For the weight function we need some information about the
5417 pagesize on the target. This is information need not be 100%
5418 accurate. Since this information is not available (so far) we
5419 define it here to a reasonable default value. If it is crucial
5420 to have a better value some day simply define this value. */
5421 # ifndef BFD_TARGET_PAGESIZE
5422 # define BFD_TARGET_PAGESIZE (4096)
5425 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5427 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5430 /* Variant 1: optimize for short chains. We add the squares
5431 of all the chain lengths (which favors many small chain
5432 over a few long chains). */
5433 for (j = 0; j < i; ++j)
5434 max += counts[j] * counts[j];
5436 /* This adds penalties for the overall size of the table. */
5437 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5440 /* Variant 2: Optimize a lot more for small table. Here we
5441 also add squares of the size but we also add penalties for
5442 empty slots (the +1 term). */
5443 for (j = 0; j < i; ++j)
5444 max += (1 + counts[j]) * (1 + counts[j]);
5446 /* The overall size of the table is considered, but not as
5447 strong as in variant 1, where it is squared. */
5448 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5452 /* Compare with current best results. */
5453 if (max < best_chlen)
5457 no_improvement_count = 0;
5459 /* PR 11843: Avoid futile long searches for the best bucket size
5460 when there are a large number of symbols. */
5461 else if (++no_improvement_count == 100)
5468 #endif /* defined (BFD_HOST_U_64_BIT) */
5470 /* This is the fallback solution if no 64bit type is available or if we
5471 are not supposed to spend much time on optimizations. We select the
5472 bucket count using a fixed set of numbers. */
5473 for (i = 0; elf_buckets[i] != 0; i++)
5475 best_size = elf_buckets[i];
5476 if (nsyms < elf_buckets[i + 1])
5479 if (gnu_hash && best_size < 2)
5486 /* Size any SHT_GROUP section for ld -r. */
5489 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5493 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
5494 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5495 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5500 /* Set a default stack segment size. The value in INFO wins. If it
5501 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5502 undefined it is initialized. */
5505 bfd_elf_stack_segment_size (bfd *output_bfd,
5506 struct bfd_link_info *info,
5507 const char *legacy_symbol,
5508 bfd_vma default_size)
5510 struct elf_link_hash_entry *h = NULL;
5512 /* Look for legacy symbol. */
5514 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5515 FALSE, FALSE, FALSE);
5516 if (h && (h->root.type == bfd_link_hash_defined
5517 || h->root.type == bfd_link_hash_defweak)
5519 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5521 /* The symbol has no type if specified on the command line. */
5522 h->type = STT_OBJECT;
5523 if (info->stacksize)
5524 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5525 output_bfd, legacy_symbol);
5526 else if (h->root.u.def.section != bfd_abs_section_ptr)
5527 (*_bfd_error_handler) (_("%B: %s not absolute"),
5528 output_bfd, legacy_symbol);
5530 info->stacksize = h->root.u.def.value;
5533 if (!info->stacksize)
5534 /* If the user didn't set a size, or explicitly inhibit the
5535 size, set it now. */
5536 info->stacksize = default_size;
5538 /* Provide the legacy symbol, if it is referenced. */
5539 if (h && (h->root.type == bfd_link_hash_undefined
5540 || h->root.type == bfd_link_hash_undefweak))
5542 struct bfd_link_hash_entry *bh = NULL;
5544 if (!(_bfd_generic_link_add_one_symbol
5545 (info, output_bfd, legacy_symbol,
5546 BSF_GLOBAL, bfd_abs_section_ptr,
5547 info->stacksize >= 0 ? info->stacksize : 0,
5548 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5551 h = (struct elf_link_hash_entry *) bh;
5553 h->type = STT_OBJECT;
5559 /* Set up the sizes and contents of the ELF dynamic sections. This is
5560 called by the ELF linker emulation before_allocation routine. We
5561 must set the sizes of the sections before the linker sets the
5562 addresses of the various sections. */
5565 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5568 const char *filter_shlib,
5570 const char *depaudit,
5571 const char * const *auxiliary_filters,
5572 struct bfd_link_info *info,
5573 asection **sinterpptr)
5575 bfd_size_type soname_indx;
5577 const struct elf_backend_data *bed;
5578 struct elf_info_failed asvinfo;
5582 soname_indx = (bfd_size_type) -1;
5584 if (!is_elf_hash_table (info->hash))
5587 bed = get_elf_backend_data (output_bfd);
5589 /* Any syms created from now on start with -1 in
5590 got.refcount/offset and plt.refcount/offset. */
5591 elf_hash_table (info)->init_got_refcount
5592 = elf_hash_table (info)->init_got_offset;
5593 elf_hash_table (info)->init_plt_refcount
5594 = elf_hash_table (info)->init_plt_offset;
5596 if (info->relocatable
5597 && !_bfd_elf_size_group_sections (info))
5600 /* The backend may have to create some sections regardless of whether
5601 we're dynamic or not. */
5602 if (bed->elf_backend_always_size_sections
5603 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5606 /* Determine any GNU_STACK segment requirements, after the backend
5607 has had a chance to set a default segment size. */
5608 if (info->execstack)
5609 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5610 else if (info->noexecstack)
5611 elf_stack_flags (output_bfd) = PF_R | PF_W;
5615 asection *notesec = NULL;
5618 for (inputobj = info->input_bfds;
5620 inputobj = inputobj->link_next)
5625 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5627 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5630 if (s->flags & SEC_CODE)
5634 else if (bed->default_execstack)
5637 if (notesec || info->stacksize > 0)
5638 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5639 if (notesec && exec && info->relocatable
5640 && notesec->output_section != bfd_abs_section_ptr)
5641 notesec->output_section->flags |= SEC_CODE;
5644 dynobj = elf_hash_table (info)->dynobj;
5646 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5648 struct elf_info_failed eif;
5649 struct elf_link_hash_entry *h;
5651 struct bfd_elf_version_tree *t;
5652 struct bfd_elf_version_expr *d;
5654 bfd_boolean all_defined;
5656 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5657 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5661 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5663 if (soname_indx == (bfd_size_type) -1
5664 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5670 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5672 info->flags |= DF_SYMBOLIC;
5680 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5682 if (indx == (bfd_size_type) -1)
5685 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5686 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5690 if (filter_shlib != NULL)
5694 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5695 filter_shlib, TRUE);
5696 if (indx == (bfd_size_type) -1
5697 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5701 if (auxiliary_filters != NULL)
5703 const char * const *p;
5705 for (p = auxiliary_filters; *p != NULL; p++)
5709 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5711 if (indx == (bfd_size_type) -1
5712 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5721 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5723 if (indx == (bfd_size_type) -1
5724 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5728 if (depaudit != NULL)
5732 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5734 if (indx == (bfd_size_type) -1
5735 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5742 /* If we are supposed to export all symbols into the dynamic symbol
5743 table (this is not the normal case), then do so. */
5744 if (info->export_dynamic
5745 || (info->executable && info->dynamic))
5747 elf_link_hash_traverse (elf_hash_table (info),
5748 _bfd_elf_export_symbol,
5754 /* Make all global versions with definition. */
5755 for (t = info->version_info; t != NULL; t = t->next)
5756 for (d = t->globals.list; d != NULL; d = d->next)
5757 if (!d->symver && d->literal)
5759 const char *verstr, *name;
5760 size_t namelen, verlen, newlen;
5761 char *newname, *p, leading_char;
5762 struct elf_link_hash_entry *newh;
5764 leading_char = bfd_get_symbol_leading_char (output_bfd);
5766 namelen = strlen (name) + (leading_char != '\0');
5768 verlen = strlen (verstr);
5769 newlen = namelen + verlen + 3;
5771 newname = (char *) bfd_malloc (newlen);
5772 if (newname == NULL)
5774 newname[0] = leading_char;
5775 memcpy (newname + (leading_char != '\0'), name, namelen);
5777 /* Check the hidden versioned definition. */
5778 p = newname + namelen;
5780 memcpy (p, verstr, verlen + 1);
5781 newh = elf_link_hash_lookup (elf_hash_table (info),
5782 newname, FALSE, FALSE,
5785 || (newh->root.type != bfd_link_hash_defined
5786 && newh->root.type != bfd_link_hash_defweak))
5788 /* Check the default versioned definition. */
5790 memcpy (p, verstr, verlen + 1);
5791 newh = elf_link_hash_lookup (elf_hash_table (info),
5792 newname, FALSE, FALSE,
5797 /* Mark this version if there is a definition and it is
5798 not defined in a shared object. */
5800 && !newh->def_dynamic
5801 && (newh->root.type == bfd_link_hash_defined
5802 || newh->root.type == bfd_link_hash_defweak))
5806 /* Attach all the symbols to their version information. */
5807 asvinfo.info = info;
5808 asvinfo.failed = FALSE;
5810 elf_link_hash_traverse (elf_hash_table (info),
5811 _bfd_elf_link_assign_sym_version,
5816 if (!info->allow_undefined_version)
5818 /* Check if all global versions have a definition. */
5820 for (t = info->version_info; t != NULL; t = t->next)
5821 for (d = t->globals.list; d != NULL; d = d->next)
5822 if (d->literal && !d->symver && !d->script)
5824 (*_bfd_error_handler)
5825 (_("%s: undefined version: %s"),
5826 d->pattern, t->name);
5827 all_defined = FALSE;
5832 bfd_set_error (bfd_error_bad_value);
5837 /* Find all symbols which were defined in a dynamic object and make
5838 the backend pick a reasonable value for them. */
5839 elf_link_hash_traverse (elf_hash_table (info),
5840 _bfd_elf_adjust_dynamic_symbol,
5845 /* Add some entries to the .dynamic section. We fill in some of the
5846 values later, in bfd_elf_final_link, but we must add the entries
5847 now so that we know the final size of the .dynamic section. */
5849 /* If there are initialization and/or finalization functions to
5850 call then add the corresponding DT_INIT/DT_FINI entries. */
5851 h = (info->init_function
5852 ? elf_link_hash_lookup (elf_hash_table (info),
5853 info->init_function, FALSE,
5860 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5863 h = (info->fini_function
5864 ? elf_link_hash_lookup (elf_hash_table (info),
5865 info->fini_function, FALSE,
5872 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5876 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5877 if (s != NULL && s->linker_has_input)
5879 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5880 if (! info->executable)
5885 for (sub = info->input_bfds; sub != NULL;
5886 sub = sub->link_next)
5887 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5888 for (o = sub->sections; o != NULL; o = o->next)
5889 if (elf_section_data (o)->this_hdr.sh_type
5890 == SHT_PREINIT_ARRAY)
5892 (*_bfd_error_handler)
5893 (_("%B: .preinit_array section is not allowed in DSO"),
5898 bfd_set_error (bfd_error_nonrepresentable_section);
5902 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5903 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5906 s = bfd_get_section_by_name (output_bfd, ".init_array");
5907 if (s != NULL && s->linker_has_input)
5909 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5910 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5913 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5914 if (s != NULL && s->linker_has_input)
5916 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5917 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5921 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
5922 /* If .dynstr is excluded from the link, we don't want any of
5923 these tags. Strictly, we should be checking each section
5924 individually; This quick check covers for the case where
5925 someone does a /DISCARD/ : { *(*) }. */
5926 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5928 bfd_size_type strsize;
5930 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5931 if ((info->emit_hash
5932 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5933 || (info->emit_gnu_hash
5934 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5935 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5936 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5937 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5938 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5939 bed->s->sizeof_sym))
5944 /* The backend must work out the sizes of all the other dynamic
5947 && bed->elf_backend_size_dynamic_sections != NULL
5948 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5951 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5954 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5956 unsigned long section_sym_count;
5957 struct bfd_elf_version_tree *verdefs;
5960 /* Set up the version definition section. */
5961 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
5962 BFD_ASSERT (s != NULL);
5964 /* We may have created additional version definitions if we are
5965 just linking a regular application. */
5966 verdefs = info->version_info;
5968 /* Skip anonymous version tag. */
5969 if (verdefs != NULL && verdefs->vernum == 0)
5970 verdefs = verdefs->next;
5972 if (verdefs == NULL && !info->create_default_symver)
5973 s->flags |= SEC_EXCLUDE;
5978 struct bfd_elf_version_tree *t;
5980 Elf_Internal_Verdef def;
5981 Elf_Internal_Verdaux defaux;
5982 struct bfd_link_hash_entry *bh;
5983 struct elf_link_hash_entry *h;
5989 /* Make space for the base version. */
5990 size += sizeof (Elf_External_Verdef);
5991 size += sizeof (Elf_External_Verdaux);
5994 /* Make space for the default version. */
5995 if (info->create_default_symver)
5997 size += sizeof (Elf_External_Verdef);
6001 for (t = verdefs; t != NULL; t = t->next)
6003 struct bfd_elf_version_deps *n;
6005 /* Don't emit base version twice. */
6009 size += sizeof (Elf_External_Verdef);
6010 size += sizeof (Elf_External_Verdaux);
6013 for (n = t->deps; n != NULL; n = n->next)
6014 size += sizeof (Elf_External_Verdaux);
6018 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6019 if (s->contents == NULL && s->size != 0)
6022 /* Fill in the version definition section. */
6026 def.vd_version = VER_DEF_CURRENT;
6027 def.vd_flags = VER_FLG_BASE;
6030 if (info->create_default_symver)
6032 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
6033 def.vd_next = sizeof (Elf_External_Verdef);
6037 def.vd_aux = sizeof (Elf_External_Verdef);
6038 def.vd_next = (sizeof (Elf_External_Verdef)
6039 + sizeof (Elf_External_Verdaux));
6042 if (soname_indx != (bfd_size_type) -1)
6044 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6046 def.vd_hash = bfd_elf_hash (soname);
6047 defaux.vda_name = soname_indx;
6054 name = lbasename (output_bfd->filename);
6055 def.vd_hash = bfd_elf_hash (name);
6056 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6058 if (indx == (bfd_size_type) -1)
6060 defaux.vda_name = indx;
6062 defaux.vda_next = 0;
6064 _bfd_elf_swap_verdef_out (output_bfd, &def,
6065 (Elf_External_Verdef *) p);
6066 p += sizeof (Elf_External_Verdef);
6067 if (info->create_default_symver)
6069 /* Add a symbol representing this version. */
6071 if (! (_bfd_generic_link_add_one_symbol
6072 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6074 get_elf_backend_data (dynobj)->collect, &bh)))
6076 h = (struct elf_link_hash_entry *) bh;
6079 h->type = STT_OBJECT;
6080 h->verinfo.vertree = NULL;
6082 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6085 /* Create a duplicate of the base version with the same
6086 aux block, but different flags. */
6089 def.vd_aux = sizeof (Elf_External_Verdef);
6091 def.vd_next = (sizeof (Elf_External_Verdef)
6092 + sizeof (Elf_External_Verdaux));
6095 _bfd_elf_swap_verdef_out (output_bfd, &def,
6096 (Elf_External_Verdef *) p);
6097 p += sizeof (Elf_External_Verdef);
6099 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6100 (Elf_External_Verdaux *) p);
6101 p += sizeof (Elf_External_Verdaux);
6103 for (t = verdefs; t != NULL; t = t->next)
6106 struct bfd_elf_version_deps *n;
6108 /* Don't emit the base version twice. */
6113 for (n = t->deps; n != NULL; n = n->next)
6116 /* Add a symbol representing this version. */
6118 if (! (_bfd_generic_link_add_one_symbol
6119 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6121 get_elf_backend_data (dynobj)->collect, &bh)))
6123 h = (struct elf_link_hash_entry *) bh;
6126 h->type = STT_OBJECT;
6127 h->verinfo.vertree = t;
6129 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6132 def.vd_version = VER_DEF_CURRENT;
6134 if (t->globals.list == NULL
6135 && t->locals.list == NULL
6137 def.vd_flags |= VER_FLG_WEAK;
6138 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6139 def.vd_cnt = cdeps + 1;
6140 def.vd_hash = bfd_elf_hash (t->name);
6141 def.vd_aux = sizeof (Elf_External_Verdef);
6144 /* If a basever node is next, it *must* be the last node in
6145 the chain, otherwise Verdef construction breaks. */
6146 if (t->next != NULL && t->next->vernum == 0)
6147 BFD_ASSERT (t->next->next == NULL);
6149 if (t->next != NULL && t->next->vernum != 0)
6150 def.vd_next = (sizeof (Elf_External_Verdef)
6151 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6153 _bfd_elf_swap_verdef_out (output_bfd, &def,
6154 (Elf_External_Verdef *) p);
6155 p += sizeof (Elf_External_Verdef);
6157 defaux.vda_name = h->dynstr_index;
6158 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6160 defaux.vda_next = 0;
6161 if (t->deps != NULL)
6162 defaux.vda_next = sizeof (Elf_External_Verdaux);
6163 t->name_indx = defaux.vda_name;
6165 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6166 (Elf_External_Verdaux *) p);
6167 p += sizeof (Elf_External_Verdaux);
6169 for (n = t->deps; n != NULL; n = n->next)
6171 if (n->version_needed == NULL)
6173 /* This can happen if there was an error in the
6175 defaux.vda_name = 0;
6179 defaux.vda_name = n->version_needed->name_indx;
6180 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6183 if (n->next == NULL)
6184 defaux.vda_next = 0;
6186 defaux.vda_next = sizeof (Elf_External_Verdaux);
6188 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6189 (Elf_External_Verdaux *) p);
6190 p += sizeof (Elf_External_Verdaux);
6194 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6195 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6198 elf_tdata (output_bfd)->cverdefs = cdefs;
6201 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6203 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6206 else if (info->flags & DF_BIND_NOW)
6208 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6214 if (info->executable)
6215 info->flags_1 &= ~ (DF_1_INITFIRST
6218 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6222 /* Work out the size of the version reference section. */
6224 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6225 BFD_ASSERT (s != NULL);
6227 struct elf_find_verdep_info sinfo;
6230 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6231 if (sinfo.vers == 0)
6233 sinfo.failed = FALSE;
6235 elf_link_hash_traverse (elf_hash_table (info),
6236 _bfd_elf_link_find_version_dependencies,
6241 if (elf_tdata (output_bfd)->verref == NULL)
6242 s->flags |= SEC_EXCLUDE;
6245 Elf_Internal_Verneed *t;
6250 /* Build the version dependency section. */
6253 for (t = elf_tdata (output_bfd)->verref;
6257 Elf_Internal_Vernaux *a;
6259 size += sizeof (Elf_External_Verneed);
6261 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6262 size += sizeof (Elf_External_Vernaux);
6266 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6267 if (s->contents == NULL)
6271 for (t = elf_tdata (output_bfd)->verref;
6276 Elf_Internal_Vernaux *a;
6280 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6283 t->vn_version = VER_NEED_CURRENT;
6285 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6286 elf_dt_name (t->vn_bfd) != NULL
6287 ? elf_dt_name (t->vn_bfd)
6288 : lbasename (t->vn_bfd->filename),
6290 if (indx == (bfd_size_type) -1)
6293 t->vn_aux = sizeof (Elf_External_Verneed);
6294 if (t->vn_nextref == NULL)
6297 t->vn_next = (sizeof (Elf_External_Verneed)
6298 + caux * sizeof (Elf_External_Vernaux));
6300 _bfd_elf_swap_verneed_out (output_bfd, t,
6301 (Elf_External_Verneed *) p);
6302 p += sizeof (Elf_External_Verneed);
6304 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6306 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6307 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6308 a->vna_nodename, FALSE);
6309 if (indx == (bfd_size_type) -1)
6312 if (a->vna_nextptr == NULL)
6315 a->vna_next = sizeof (Elf_External_Vernaux);
6317 _bfd_elf_swap_vernaux_out (output_bfd, a,
6318 (Elf_External_Vernaux *) p);
6319 p += sizeof (Elf_External_Vernaux);
6323 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6324 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6327 elf_tdata (output_bfd)->cverrefs = crefs;
6331 if ((elf_tdata (output_bfd)->cverrefs == 0
6332 && elf_tdata (output_bfd)->cverdefs == 0)
6333 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6334 §ion_sym_count) == 0)
6336 s = bfd_get_linker_section (dynobj, ".gnu.version");
6337 s->flags |= SEC_EXCLUDE;
6343 /* Find the first non-excluded output section. We'll use its
6344 section symbol for some emitted relocs. */
6346 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6350 for (s = output_bfd->sections; s != NULL; s = s->next)
6351 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6352 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6354 elf_hash_table (info)->text_index_section = s;
6359 /* Find two non-excluded output sections, one for code, one for data.
6360 We'll use their section symbols for some emitted relocs. */
6362 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6366 /* Data first, since setting text_index_section changes
6367 _bfd_elf_link_omit_section_dynsym. */
6368 for (s = output_bfd->sections; s != NULL; s = s->next)
6369 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6370 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6372 elf_hash_table (info)->data_index_section = s;
6376 for (s = output_bfd->sections; s != NULL; s = s->next)
6377 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6378 == (SEC_ALLOC | SEC_READONLY))
6379 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6381 elf_hash_table (info)->text_index_section = s;
6385 if (elf_hash_table (info)->text_index_section == NULL)
6386 elf_hash_table (info)->text_index_section
6387 = elf_hash_table (info)->data_index_section;
6391 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6393 const struct elf_backend_data *bed;
6395 if (!is_elf_hash_table (info->hash))
6398 bed = get_elf_backend_data (output_bfd);
6399 (*bed->elf_backend_init_index_section) (output_bfd, info);
6401 if (elf_hash_table (info)->dynamic_sections_created)
6405 bfd_size_type dynsymcount;
6406 unsigned long section_sym_count;
6407 unsigned int dtagcount;
6409 dynobj = elf_hash_table (info)->dynobj;
6411 /* Assign dynsym indicies. In a shared library we generate a
6412 section symbol for each output section, which come first.
6413 Next come all of the back-end allocated local dynamic syms,
6414 followed by the rest of the global symbols. */
6416 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6417 §ion_sym_count);
6419 /* Work out the size of the symbol version section. */
6420 s = bfd_get_linker_section (dynobj, ".gnu.version");
6421 BFD_ASSERT (s != NULL);
6422 if (dynsymcount != 0
6423 && (s->flags & SEC_EXCLUDE) == 0)
6425 s->size = dynsymcount * sizeof (Elf_External_Versym);
6426 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6427 if (s->contents == NULL)
6430 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6434 /* Set the size of the .dynsym and .hash sections. We counted
6435 the number of dynamic symbols in elf_link_add_object_symbols.
6436 We will build the contents of .dynsym and .hash when we build
6437 the final symbol table, because until then we do not know the
6438 correct value to give the symbols. We built the .dynstr
6439 section as we went along in elf_link_add_object_symbols. */
6440 s = bfd_get_linker_section (dynobj, ".dynsym");
6441 BFD_ASSERT (s != NULL);
6442 s->size = dynsymcount * bed->s->sizeof_sym;
6444 if (dynsymcount != 0)
6446 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6447 if (s->contents == NULL)
6450 /* The first entry in .dynsym is a dummy symbol.
6451 Clear all the section syms, in case we don't output them all. */
6452 ++section_sym_count;
6453 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6456 elf_hash_table (info)->bucketcount = 0;
6458 /* Compute the size of the hashing table. As a side effect this
6459 computes the hash values for all the names we export. */
6460 if (info->emit_hash)
6462 unsigned long int *hashcodes;
6463 struct hash_codes_info hashinf;
6465 unsigned long int nsyms;
6467 size_t hash_entry_size;
6469 /* Compute the hash values for all exported symbols. At the same
6470 time store the values in an array so that we could use them for
6472 amt = dynsymcount * sizeof (unsigned long int);
6473 hashcodes = (unsigned long int *) bfd_malloc (amt);
6474 if (hashcodes == NULL)
6476 hashinf.hashcodes = hashcodes;
6477 hashinf.error = FALSE;
6479 /* Put all hash values in HASHCODES. */
6480 elf_link_hash_traverse (elf_hash_table (info),
6481 elf_collect_hash_codes, &hashinf);
6488 nsyms = hashinf.hashcodes - hashcodes;
6490 = compute_bucket_count (info, hashcodes, nsyms, 0);
6493 if (bucketcount == 0)
6496 elf_hash_table (info)->bucketcount = bucketcount;
6498 s = bfd_get_linker_section (dynobj, ".hash");
6499 BFD_ASSERT (s != NULL);
6500 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6501 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6502 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6503 if (s->contents == NULL)
6506 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6507 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6508 s->contents + hash_entry_size);
6511 if (info->emit_gnu_hash)
6514 unsigned char *contents;
6515 struct collect_gnu_hash_codes cinfo;
6519 memset (&cinfo, 0, sizeof (cinfo));
6521 /* Compute the hash values for all exported symbols. At the same
6522 time store the values in an array so that we could use them for
6524 amt = dynsymcount * 2 * sizeof (unsigned long int);
6525 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6526 if (cinfo.hashcodes == NULL)
6529 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6530 cinfo.min_dynindx = -1;
6531 cinfo.output_bfd = output_bfd;
6534 /* Put all hash values in HASHCODES. */
6535 elf_link_hash_traverse (elf_hash_table (info),
6536 elf_collect_gnu_hash_codes, &cinfo);
6539 free (cinfo.hashcodes);
6544 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6546 if (bucketcount == 0)
6548 free (cinfo.hashcodes);
6552 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6553 BFD_ASSERT (s != NULL);
6555 if (cinfo.nsyms == 0)
6557 /* Empty .gnu.hash section is special. */
6558 BFD_ASSERT (cinfo.min_dynindx == -1);
6559 free (cinfo.hashcodes);
6560 s->size = 5 * 4 + bed->s->arch_size / 8;
6561 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6562 if (contents == NULL)
6564 s->contents = contents;
6565 /* 1 empty bucket. */
6566 bfd_put_32 (output_bfd, 1, contents);
6567 /* SYMIDX above the special symbol 0. */
6568 bfd_put_32 (output_bfd, 1, contents + 4);
6569 /* Just one word for bitmask. */
6570 bfd_put_32 (output_bfd, 1, contents + 8);
6571 /* Only hash fn bloom filter. */
6572 bfd_put_32 (output_bfd, 0, contents + 12);
6573 /* No hashes are valid - empty bitmask. */
6574 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6575 /* No hashes in the only bucket. */
6576 bfd_put_32 (output_bfd, 0,
6577 contents + 16 + bed->s->arch_size / 8);
6581 unsigned long int maskwords, maskbitslog2, x;
6582 BFD_ASSERT (cinfo.min_dynindx != -1);
6586 while ((x >>= 1) != 0)
6588 if (maskbitslog2 < 3)
6590 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6591 maskbitslog2 = maskbitslog2 + 3;
6593 maskbitslog2 = maskbitslog2 + 2;
6594 if (bed->s->arch_size == 64)
6596 if (maskbitslog2 == 5)
6602 cinfo.mask = (1 << cinfo.shift1) - 1;
6603 cinfo.shift2 = maskbitslog2;
6604 cinfo.maskbits = 1 << maskbitslog2;
6605 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6606 amt = bucketcount * sizeof (unsigned long int) * 2;
6607 amt += maskwords * sizeof (bfd_vma);
6608 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6609 if (cinfo.bitmask == NULL)
6611 free (cinfo.hashcodes);
6615 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6616 cinfo.indx = cinfo.counts + bucketcount;
6617 cinfo.symindx = dynsymcount - cinfo.nsyms;
6618 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6620 /* Determine how often each hash bucket is used. */
6621 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6622 for (i = 0; i < cinfo.nsyms; ++i)
6623 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6625 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6626 if (cinfo.counts[i] != 0)
6628 cinfo.indx[i] = cnt;
6629 cnt += cinfo.counts[i];
6631 BFD_ASSERT (cnt == dynsymcount);
6632 cinfo.bucketcount = bucketcount;
6633 cinfo.local_indx = cinfo.min_dynindx;
6635 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6636 s->size += cinfo.maskbits / 8;
6637 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6638 if (contents == NULL)
6640 free (cinfo.bitmask);
6641 free (cinfo.hashcodes);
6645 s->contents = contents;
6646 bfd_put_32 (output_bfd, bucketcount, contents);
6647 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6648 bfd_put_32 (output_bfd, maskwords, contents + 8);
6649 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6650 contents += 16 + cinfo.maskbits / 8;
6652 for (i = 0; i < bucketcount; ++i)
6654 if (cinfo.counts[i] == 0)
6655 bfd_put_32 (output_bfd, 0, contents);
6657 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6661 cinfo.contents = contents;
6663 /* Renumber dynamic symbols, populate .gnu.hash section. */
6664 elf_link_hash_traverse (elf_hash_table (info),
6665 elf_renumber_gnu_hash_syms, &cinfo);
6667 contents = s->contents + 16;
6668 for (i = 0; i < maskwords; ++i)
6670 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6672 contents += bed->s->arch_size / 8;
6675 free (cinfo.bitmask);
6676 free (cinfo.hashcodes);
6680 s = bfd_get_linker_section (dynobj, ".dynstr");
6681 BFD_ASSERT (s != NULL);
6683 elf_finalize_dynstr (output_bfd, info);
6685 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6687 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6688 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6695 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6698 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6701 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6702 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6705 /* Finish SHF_MERGE section merging. */
6708 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6713 if (!is_elf_hash_table (info->hash))
6716 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6717 if ((ibfd->flags & DYNAMIC) == 0)
6718 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6719 if ((sec->flags & SEC_MERGE) != 0
6720 && !bfd_is_abs_section (sec->output_section))
6722 struct bfd_elf_section_data *secdata;
6724 secdata = elf_section_data (sec);
6725 if (! _bfd_add_merge_section (abfd,
6726 &elf_hash_table (info)->merge_info,
6727 sec, &secdata->sec_info))
6729 else if (secdata->sec_info)
6730 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6733 if (elf_hash_table (info)->merge_info != NULL)
6734 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6735 merge_sections_remove_hook);
6739 /* Create an entry in an ELF linker hash table. */
6741 struct bfd_hash_entry *
6742 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6743 struct bfd_hash_table *table,
6746 /* Allocate the structure if it has not already been allocated by a
6750 entry = (struct bfd_hash_entry *)
6751 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6756 /* Call the allocation method of the superclass. */
6757 entry = _bfd_link_hash_newfunc (entry, table, string);
6760 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6761 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6763 /* Set local fields. */
6766 ret->got = htab->init_got_refcount;
6767 ret->plt = htab->init_plt_refcount;
6768 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6769 - offsetof (struct elf_link_hash_entry, size)));
6770 /* Assume that we have been called by a non-ELF symbol reader.
6771 This flag is then reset by the code which reads an ELF input
6772 file. This ensures that a symbol created by a non-ELF symbol
6773 reader will have the flag set correctly. */
6780 /* Copy data from an indirect symbol to its direct symbol, hiding the
6781 old indirect symbol. Also used for copying flags to a weakdef. */
6784 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6785 struct elf_link_hash_entry *dir,
6786 struct elf_link_hash_entry *ind)
6788 struct elf_link_hash_table *htab;
6790 /* Copy down any references that we may have already seen to the
6791 symbol which just became indirect. */
6793 dir->ref_dynamic |= ind->ref_dynamic;
6794 dir->ref_regular |= ind->ref_regular;
6795 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6796 dir->non_got_ref |= ind->non_got_ref;
6797 dir->needs_plt |= ind->needs_plt;
6798 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6800 if (ind->root.type != bfd_link_hash_indirect)
6803 /* Copy over the global and procedure linkage table refcount entries.
6804 These may have been already set up by a check_relocs routine. */
6805 htab = elf_hash_table (info);
6806 if (ind->got.refcount > htab->init_got_refcount.refcount)
6808 if (dir->got.refcount < 0)
6809 dir->got.refcount = 0;
6810 dir->got.refcount += ind->got.refcount;
6811 ind->got.refcount = htab->init_got_refcount.refcount;
6814 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6816 if (dir->plt.refcount < 0)
6817 dir->plt.refcount = 0;
6818 dir->plt.refcount += ind->plt.refcount;
6819 ind->plt.refcount = htab->init_plt_refcount.refcount;
6822 if (ind->dynindx != -1)
6824 if (dir->dynindx != -1)
6825 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6826 dir->dynindx = ind->dynindx;
6827 dir->dynstr_index = ind->dynstr_index;
6829 ind->dynstr_index = 0;
6834 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6835 struct elf_link_hash_entry *h,
6836 bfd_boolean force_local)
6838 /* STT_GNU_IFUNC symbol must go through PLT. */
6839 if (h->type != STT_GNU_IFUNC)
6841 h->plt = elf_hash_table (info)->init_plt_offset;
6846 h->forced_local = 1;
6847 if (h->dynindx != -1)
6850 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6856 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
6860 _bfd_elf_link_hash_table_init
6861 (struct elf_link_hash_table *table,
6863 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6864 struct bfd_hash_table *,
6866 unsigned int entsize,
6867 enum elf_target_id target_id)
6870 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6872 table->init_got_refcount.refcount = can_refcount - 1;
6873 table->init_plt_refcount.refcount = can_refcount - 1;
6874 table->init_got_offset.offset = -(bfd_vma) 1;
6875 table->init_plt_offset.offset = -(bfd_vma) 1;
6876 /* The first dynamic symbol is a dummy. */
6877 table->dynsymcount = 1;
6879 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6881 table->root.type = bfd_link_elf_hash_table;
6882 table->hash_table_id = target_id;
6887 /* Create an ELF linker hash table. */
6889 struct bfd_link_hash_table *
6890 _bfd_elf_link_hash_table_create (bfd *abfd)
6892 struct elf_link_hash_table *ret;
6893 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6895 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
6899 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6900 sizeof (struct elf_link_hash_entry),
6910 /* Destroy an ELF linker hash table. */
6913 _bfd_elf_link_hash_table_free (struct bfd_link_hash_table *hash)
6915 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) hash;
6916 if (htab->dynstr != NULL)
6917 _bfd_elf_strtab_free (htab->dynstr);
6918 _bfd_merge_sections_free (htab->merge_info);
6919 _bfd_generic_link_hash_table_free (hash);
6922 /* This is a hook for the ELF emulation code in the generic linker to
6923 tell the backend linker what file name to use for the DT_NEEDED
6924 entry for a dynamic object. */
6927 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6929 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6930 && bfd_get_format (abfd) == bfd_object)
6931 elf_dt_name (abfd) = name;
6935 bfd_elf_get_dyn_lib_class (bfd *abfd)
6938 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6939 && bfd_get_format (abfd) == bfd_object)
6940 lib_class = elf_dyn_lib_class (abfd);
6947 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6949 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6950 && bfd_get_format (abfd) == bfd_object)
6951 elf_dyn_lib_class (abfd) = lib_class;
6954 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6955 the linker ELF emulation code. */
6957 struct bfd_link_needed_list *
6958 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6959 struct bfd_link_info *info)
6961 if (! is_elf_hash_table (info->hash))
6963 return elf_hash_table (info)->needed;
6966 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6967 hook for the linker ELF emulation code. */
6969 struct bfd_link_needed_list *
6970 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6971 struct bfd_link_info *info)
6973 if (! is_elf_hash_table (info->hash))
6975 return elf_hash_table (info)->runpath;
6978 /* Get the name actually used for a dynamic object for a link. This
6979 is the SONAME entry if there is one. Otherwise, it is the string
6980 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6983 bfd_elf_get_dt_soname (bfd *abfd)
6985 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6986 && bfd_get_format (abfd) == bfd_object)
6987 return elf_dt_name (abfd);
6991 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6992 the ELF linker emulation code. */
6995 bfd_elf_get_bfd_needed_list (bfd *abfd,
6996 struct bfd_link_needed_list **pneeded)
6999 bfd_byte *dynbuf = NULL;
7000 unsigned int elfsec;
7001 unsigned long shlink;
7002 bfd_byte *extdyn, *extdynend;
7004 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
7008 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
7009 || bfd_get_format (abfd) != bfd_object)
7012 s = bfd_get_section_by_name (abfd, ".dynamic");
7013 if (s == NULL || s->size == 0)
7016 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
7019 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
7020 if (elfsec == SHN_BAD)
7023 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
7025 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
7026 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
7029 extdynend = extdyn + s->size;
7030 for (; extdyn < extdynend; extdyn += extdynsize)
7032 Elf_Internal_Dyn dyn;
7034 (*swap_dyn_in) (abfd, extdyn, &dyn);
7036 if (dyn.d_tag == DT_NULL)
7039 if (dyn.d_tag == DT_NEEDED)
7042 struct bfd_link_needed_list *l;
7043 unsigned int tagv = dyn.d_un.d_val;
7046 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7051 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7072 struct elf_symbuf_symbol
7074 unsigned long st_name; /* Symbol name, index in string tbl */
7075 unsigned char st_info; /* Type and binding attributes */
7076 unsigned char st_other; /* Visibilty, and target specific */
7079 struct elf_symbuf_head
7081 struct elf_symbuf_symbol *ssym;
7082 bfd_size_type count;
7083 unsigned int st_shndx;
7090 Elf_Internal_Sym *isym;
7091 struct elf_symbuf_symbol *ssym;
7096 /* Sort references to symbols by ascending section number. */
7099 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7101 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7102 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7104 return s1->st_shndx - s2->st_shndx;
7108 elf_sym_name_compare (const void *arg1, const void *arg2)
7110 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7111 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7112 return strcmp (s1->name, s2->name);
7115 static struct elf_symbuf_head *
7116 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7118 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7119 struct elf_symbuf_symbol *ssym;
7120 struct elf_symbuf_head *ssymbuf, *ssymhead;
7121 bfd_size_type i, shndx_count, total_size;
7123 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7127 for (ind = indbuf, i = 0; i < symcount; i++)
7128 if (isymbuf[i].st_shndx != SHN_UNDEF)
7129 *ind++ = &isymbuf[i];
7132 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7133 elf_sort_elf_symbol);
7136 if (indbufend > indbuf)
7137 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7138 if (ind[0]->st_shndx != ind[1]->st_shndx)
7141 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7142 + (indbufend - indbuf) * sizeof (*ssym));
7143 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7144 if (ssymbuf == NULL)
7150 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7151 ssymbuf->ssym = NULL;
7152 ssymbuf->count = shndx_count;
7153 ssymbuf->st_shndx = 0;
7154 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7156 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7159 ssymhead->ssym = ssym;
7160 ssymhead->count = 0;
7161 ssymhead->st_shndx = (*ind)->st_shndx;
7163 ssym->st_name = (*ind)->st_name;
7164 ssym->st_info = (*ind)->st_info;
7165 ssym->st_other = (*ind)->st_other;
7168 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7169 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7176 /* Check if 2 sections define the same set of local and global
7180 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7181 struct bfd_link_info *info)
7184 const struct elf_backend_data *bed1, *bed2;
7185 Elf_Internal_Shdr *hdr1, *hdr2;
7186 bfd_size_type symcount1, symcount2;
7187 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7188 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7189 Elf_Internal_Sym *isym, *isymend;
7190 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7191 bfd_size_type count1, count2, i;
7192 unsigned int shndx1, shndx2;
7198 /* Both sections have to be in ELF. */
7199 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7200 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7203 if (elf_section_type (sec1) != elf_section_type (sec2))
7206 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7207 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7208 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7211 bed1 = get_elf_backend_data (bfd1);
7212 bed2 = get_elf_backend_data (bfd2);
7213 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7214 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7215 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7216 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7218 if (symcount1 == 0 || symcount2 == 0)
7224 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7225 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7227 if (ssymbuf1 == NULL)
7229 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7231 if (isymbuf1 == NULL)
7234 if (!info->reduce_memory_overheads)
7235 elf_tdata (bfd1)->symbuf = ssymbuf1
7236 = elf_create_symbuf (symcount1, isymbuf1);
7239 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7241 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7243 if (isymbuf2 == NULL)
7246 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7247 elf_tdata (bfd2)->symbuf = ssymbuf2
7248 = elf_create_symbuf (symcount2, isymbuf2);
7251 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7253 /* Optimized faster version. */
7254 bfd_size_type lo, hi, mid;
7255 struct elf_symbol *symp;
7256 struct elf_symbuf_symbol *ssym, *ssymend;
7259 hi = ssymbuf1->count;
7264 mid = (lo + hi) / 2;
7265 if (shndx1 < ssymbuf1[mid].st_shndx)
7267 else if (shndx1 > ssymbuf1[mid].st_shndx)
7271 count1 = ssymbuf1[mid].count;
7278 hi = ssymbuf2->count;
7283 mid = (lo + hi) / 2;
7284 if (shndx2 < ssymbuf2[mid].st_shndx)
7286 else if (shndx2 > ssymbuf2[mid].st_shndx)
7290 count2 = ssymbuf2[mid].count;
7296 if (count1 == 0 || count2 == 0 || count1 != count2)
7299 symtable1 = (struct elf_symbol *)
7300 bfd_malloc (count1 * sizeof (struct elf_symbol));
7301 symtable2 = (struct elf_symbol *)
7302 bfd_malloc (count2 * sizeof (struct elf_symbol));
7303 if (symtable1 == NULL || symtable2 == NULL)
7307 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7308 ssym < ssymend; ssym++, symp++)
7310 symp->u.ssym = ssym;
7311 symp->name = bfd_elf_string_from_elf_section (bfd1,
7317 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7318 ssym < ssymend; ssym++, symp++)
7320 symp->u.ssym = ssym;
7321 symp->name = bfd_elf_string_from_elf_section (bfd2,
7326 /* Sort symbol by name. */
7327 qsort (symtable1, count1, sizeof (struct elf_symbol),
7328 elf_sym_name_compare);
7329 qsort (symtable2, count1, sizeof (struct elf_symbol),
7330 elf_sym_name_compare);
7332 for (i = 0; i < count1; i++)
7333 /* Two symbols must have the same binding, type and name. */
7334 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7335 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7336 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7343 symtable1 = (struct elf_symbol *)
7344 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7345 symtable2 = (struct elf_symbol *)
7346 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7347 if (symtable1 == NULL || symtable2 == NULL)
7350 /* Count definitions in the section. */
7352 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7353 if (isym->st_shndx == shndx1)
7354 symtable1[count1++].u.isym = isym;
7357 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7358 if (isym->st_shndx == shndx2)
7359 symtable2[count2++].u.isym = isym;
7361 if (count1 == 0 || count2 == 0 || count1 != count2)
7364 for (i = 0; i < count1; i++)
7366 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7367 symtable1[i].u.isym->st_name);
7369 for (i = 0; i < count2; i++)
7371 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7372 symtable2[i].u.isym->st_name);
7374 /* Sort symbol by name. */
7375 qsort (symtable1, count1, sizeof (struct elf_symbol),
7376 elf_sym_name_compare);
7377 qsort (symtable2, count1, sizeof (struct elf_symbol),
7378 elf_sym_name_compare);
7380 for (i = 0; i < count1; i++)
7381 /* Two symbols must have the same binding, type and name. */
7382 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7383 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7384 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7402 /* Return TRUE if 2 section types are compatible. */
7405 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7406 bfd *bbfd, const asection *bsec)
7410 || abfd->xvec->flavour != bfd_target_elf_flavour
7411 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7414 return elf_section_type (asec) == elf_section_type (bsec);
7417 /* Final phase of ELF linker. */
7419 /* A structure we use to avoid passing large numbers of arguments. */
7421 struct elf_final_link_info
7423 /* General link information. */
7424 struct bfd_link_info *info;
7427 /* Symbol string table. */
7428 struct bfd_strtab_hash *symstrtab;
7429 /* .dynsym section. */
7430 asection *dynsym_sec;
7431 /* .hash section. */
7433 /* symbol version section (.gnu.version). */
7434 asection *symver_sec;
7435 /* Buffer large enough to hold contents of any section. */
7437 /* Buffer large enough to hold external relocs of any section. */
7438 void *external_relocs;
7439 /* Buffer large enough to hold internal relocs of any section. */
7440 Elf_Internal_Rela *internal_relocs;
7441 /* Buffer large enough to hold external local symbols of any input
7443 bfd_byte *external_syms;
7444 /* And a buffer for symbol section indices. */
7445 Elf_External_Sym_Shndx *locsym_shndx;
7446 /* Buffer large enough to hold internal local symbols of any input
7448 Elf_Internal_Sym *internal_syms;
7449 /* Array large enough to hold a symbol index for each local symbol
7450 of any input BFD. */
7452 /* Array large enough to hold a section pointer for each local
7453 symbol of any input BFD. */
7454 asection **sections;
7455 /* Buffer to hold swapped out symbols. */
7457 /* And one for symbol section indices. */
7458 Elf_External_Sym_Shndx *symshndxbuf;
7459 /* Number of swapped out symbols in buffer. */
7460 size_t symbuf_count;
7461 /* Number of symbols which fit in symbuf. */
7463 /* And same for symshndxbuf. */
7464 size_t shndxbuf_size;
7465 /* Number of STT_FILE syms seen. */
7466 size_t filesym_count;
7469 /* This struct is used to pass information to elf_link_output_extsym. */
7471 struct elf_outext_info
7474 bfd_boolean localsyms;
7475 bfd_boolean need_second_pass;
7476 bfd_boolean second_pass;
7477 struct elf_final_link_info *flinfo;
7481 /* Support for evaluating a complex relocation.
7483 Complex relocations are generalized, self-describing relocations. The
7484 implementation of them consists of two parts: complex symbols, and the
7485 relocations themselves.
7487 The relocations are use a reserved elf-wide relocation type code (R_RELC
7488 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7489 information (start bit, end bit, word width, etc) into the addend. This
7490 information is extracted from CGEN-generated operand tables within gas.
7492 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7493 internal) representing prefix-notation expressions, including but not
7494 limited to those sorts of expressions normally encoded as addends in the
7495 addend field. The symbol mangling format is:
7498 | <unary-operator> ':' <node>
7499 | <binary-operator> ':' <node> ':' <node>
7502 <literal> := 's' <digits=N> ':' <N character symbol name>
7503 | 'S' <digits=N> ':' <N character section name>
7507 <binary-operator> := as in C
7508 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7511 set_symbol_value (bfd *bfd_with_globals,
7512 Elf_Internal_Sym *isymbuf,
7517 struct elf_link_hash_entry **sym_hashes;
7518 struct elf_link_hash_entry *h;
7519 size_t extsymoff = locsymcount;
7521 if (symidx < locsymcount)
7523 Elf_Internal_Sym *sym;
7525 sym = isymbuf + symidx;
7526 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7528 /* It is a local symbol: move it to the
7529 "absolute" section and give it a value. */
7530 sym->st_shndx = SHN_ABS;
7531 sym->st_value = val;
7534 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7538 /* It is a global symbol: set its link type
7539 to "defined" and give it a value. */
7541 sym_hashes = elf_sym_hashes (bfd_with_globals);
7542 h = sym_hashes [symidx - extsymoff];
7543 while (h->root.type == bfd_link_hash_indirect
7544 || h->root.type == bfd_link_hash_warning)
7545 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7546 h->root.type = bfd_link_hash_defined;
7547 h->root.u.def.value = val;
7548 h->root.u.def.section = bfd_abs_section_ptr;
7552 resolve_symbol (const char *name,
7554 struct elf_final_link_info *flinfo,
7556 Elf_Internal_Sym *isymbuf,
7559 Elf_Internal_Sym *sym;
7560 struct bfd_link_hash_entry *global_entry;
7561 const char *candidate = NULL;
7562 Elf_Internal_Shdr *symtab_hdr;
7565 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7567 for (i = 0; i < locsymcount; ++ i)
7571 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7574 candidate = bfd_elf_string_from_elf_section (input_bfd,
7575 symtab_hdr->sh_link,
7578 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7579 name, candidate, (unsigned long) sym->st_value);
7581 if (candidate && strcmp (candidate, name) == 0)
7583 asection *sec = flinfo->sections [i];
7585 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7586 *result += sec->output_offset + sec->output_section->vma;
7588 printf ("Found symbol with value %8.8lx\n",
7589 (unsigned long) *result);
7595 /* Hmm, haven't found it yet. perhaps it is a global. */
7596 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7597 FALSE, FALSE, TRUE);
7601 if (global_entry->type == bfd_link_hash_defined
7602 || global_entry->type == bfd_link_hash_defweak)
7604 *result = (global_entry->u.def.value
7605 + global_entry->u.def.section->output_section->vma
7606 + global_entry->u.def.section->output_offset);
7608 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7609 global_entry->root.string, (unsigned long) *result);
7618 resolve_section (const char *name,
7625 for (curr = sections; curr; curr = curr->next)
7626 if (strcmp (curr->name, name) == 0)
7628 *result = curr->vma;
7632 /* Hmm. still haven't found it. try pseudo-section names. */
7633 for (curr = sections; curr; curr = curr->next)
7635 len = strlen (curr->name);
7636 if (len > strlen (name))
7639 if (strncmp (curr->name, name, len) == 0)
7641 if (strncmp (".end", name + len, 4) == 0)
7643 *result = curr->vma + curr->size;
7647 /* Insert more pseudo-section names here, if you like. */
7655 undefined_reference (const char *reftype, const char *name)
7657 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7662 eval_symbol (bfd_vma *result,
7665 struct elf_final_link_info *flinfo,
7667 Elf_Internal_Sym *isymbuf,
7676 const char *sym = *symp;
7678 bfd_boolean symbol_is_section = FALSE;
7683 if (len < 1 || len > sizeof (symbuf))
7685 bfd_set_error (bfd_error_invalid_operation);
7698 *result = strtoul (sym, (char **) symp, 16);
7702 symbol_is_section = TRUE;
7705 symlen = strtol (sym, (char **) symp, 10);
7706 sym = *symp + 1; /* Skip the trailing ':'. */
7708 if (symend < sym || symlen + 1 > sizeof (symbuf))
7710 bfd_set_error (bfd_error_invalid_operation);
7714 memcpy (symbuf, sym, symlen);
7715 symbuf[symlen] = '\0';
7716 *symp = sym + symlen;
7718 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7719 the symbol as a section, or vice-versa. so we're pretty liberal in our
7720 interpretation here; section means "try section first", not "must be a
7721 section", and likewise with symbol. */
7723 if (symbol_is_section)
7725 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result)
7726 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7727 isymbuf, locsymcount))
7729 undefined_reference ("section", symbuf);
7735 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7736 isymbuf, locsymcount)
7737 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7740 undefined_reference ("symbol", symbuf);
7747 /* All that remains are operators. */
7749 #define UNARY_OP(op) \
7750 if (strncmp (sym, #op, strlen (#op)) == 0) \
7752 sym += strlen (#op); \
7756 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7757 isymbuf, locsymcount, signed_p)) \
7760 *result = op ((bfd_signed_vma) a); \
7766 #define BINARY_OP(op) \
7767 if (strncmp (sym, #op, strlen (#op)) == 0) \
7769 sym += strlen (#op); \
7773 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7774 isymbuf, locsymcount, signed_p)) \
7777 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7778 isymbuf, locsymcount, signed_p)) \
7781 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7811 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7812 bfd_set_error (bfd_error_invalid_operation);
7818 put_value (bfd_vma size,
7819 unsigned long chunksz,
7824 location += (size - chunksz);
7826 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7834 bfd_put_8 (input_bfd, x, location);
7837 bfd_put_16 (input_bfd, x, location);
7840 bfd_put_32 (input_bfd, x, location);
7844 bfd_put_64 (input_bfd, x, location);
7854 get_value (bfd_vma size,
7855 unsigned long chunksz,
7862 /* Sanity checks. */
7863 BFD_ASSERT (chunksz <= sizeof (x)
7866 && (size % chunksz) == 0
7867 && input_bfd != NULL
7868 && location != NULL);
7870 if (chunksz == sizeof (x))
7872 BFD_ASSERT (size == chunksz);
7874 /* Make sure that we do not perform an undefined shift operation.
7875 We know that size == chunksz so there will only be one iteration
7876 of the loop below. */
7880 shift = 8 * chunksz;
7882 for (; size; size -= chunksz, location += chunksz)
7887 x = (x << shift) | bfd_get_8 (input_bfd, location);
7890 x = (x << shift) | bfd_get_16 (input_bfd, location);
7893 x = (x << shift) | bfd_get_32 (input_bfd, location);
7897 x = (x << shift) | bfd_get_64 (input_bfd, location);
7908 decode_complex_addend (unsigned long *start, /* in bits */
7909 unsigned long *oplen, /* in bits */
7910 unsigned long *len, /* in bits */
7911 unsigned long *wordsz, /* in bytes */
7912 unsigned long *chunksz, /* in bytes */
7913 unsigned long *lsb0_p,
7914 unsigned long *signed_p,
7915 unsigned long *trunc_p,
7916 unsigned long encoded)
7918 * start = encoded & 0x3F;
7919 * len = (encoded >> 6) & 0x3F;
7920 * oplen = (encoded >> 12) & 0x3F;
7921 * wordsz = (encoded >> 18) & 0xF;
7922 * chunksz = (encoded >> 22) & 0xF;
7923 * lsb0_p = (encoded >> 27) & 1;
7924 * signed_p = (encoded >> 28) & 1;
7925 * trunc_p = (encoded >> 29) & 1;
7928 bfd_reloc_status_type
7929 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7930 asection *input_section ATTRIBUTE_UNUSED,
7932 Elf_Internal_Rela *rel,
7935 bfd_vma shift, x, mask;
7936 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7937 bfd_reloc_status_type r;
7939 /* Perform this reloc, since it is complex.
7940 (this is not to say that it necessarily refers to a complex
7941 symbol; merely that it is a self-describing CGEN based reloc.
7942 i.e. the addend has the complete reloc information (bit start, end,
7943 word size, etc) encoded within it.). */
7945 decode_complex_addend (&start, &oplen, &len, &wordsz,
7946 &chunksz, &lsb0_p, &signed_p,
7947 &trunc_p, rel->r_addend);
7949 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7952 shift = (start + 1) - len;
7954 shift = (8 * wordsz) - (start + len);
7956 /* FIXME: octets_per_byte. */
7957 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7960 printf ("Doing complex reloc: "
7961 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7962 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7963 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7964 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7965 oplen, (unsigned long) x, (unsigned long) mask,
7966 (unsigned long) relocation);
7971 /* Now do an overflow check. */
7972 r = bfd_check_overflow ((signed_p
7973 ? complain_overflow_signed
7974 : complain_overflow_unsigned),
7975 len, 0, (8 * wordsz),
7979 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7982 printf (" relocation: %8.8lx\n"
7983 " shifted mask: %8.8lx\n"
7984 " shifted/masked reloc: %8.8lx\n"
7985 " result: %8.8lx\n",
7986 (unsigned long) relocation, (unsigned long) (mask << shift),
7987 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
7989 /* FIXME: octets_per_byte. */
7990 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7994 /* When performing a relocatable link, the input relocations are
7995 preserved. But, if they reference global symbols, the indices
7996 referenced must be updated. Update all the relocations found in
8000 elf_link_adjust_relocs (bfd *abfd,
8001 struct bfd_elf_section_reloc_data *reldata)
8004 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8006 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8007 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8008 bfd_vma r_type_mask;
8010 unsigned int count = reldata->count;
8011 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8013 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8015 swap_in = bed->s->swap_reloc_in;
8016 swap_out = bed->s->swap_reloc_out;
8018 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8020 swap_in = bed->s->swap_reloca_in;
8021 swap_out = bed->s->swap_reloca_out;
8026 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8029 if (bed->s->arch_size == 32)
8036 r_type_mask = 0xffffffff;
8040 erela = reldata->hdr->contents;
8041 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8043 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8046 if (*rel_hash == NULL)
8049 BFD_ASSERT ((*rel_hash)->indx >= 0);
8051 (*swap_in) (abfd, erela, irela);
8052 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8053 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8054 | (irela[j].r_info & r_type_mask));
8055 (*swap_out) (abfd, irela, erela);
8059 struct elf_link_sort_rela
8065 enum elf_reloc_type_class type;
8066 /* We use this as an array of size int_rels_per_ext_rel. */
8067 Elf_Internal_Rela rela[1];
8071 elf_link_sort_cmp1 (const void *A, const void *B)
8073 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8074 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8075 int relativea, relativeb;
8077 relativea = a->type == reloc_class_relative;
8078 relativeb = b->type == reloc_class_relative;
8080 if (relativea < relativeb)
8082 if (relativea > relativeb)
8084 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8086 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8088 if (a->rela->r_offset < b->rela->r_offset)
8090 if (a->rela->r_offset > b->rela->r_offset)
8096 elf_link_sort_cmp2 (const void *A, const void *B)
8098 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8099 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8101 if (a->type < b->type)
8103 if (a->type > b->type)
8105 if (a->u.offset < b->u.offset)
8107 if (a->u.offset > b->u.offset)
8109 if (a->rela->r_offset < b->rela->r_offset)
8111 if (a->rela->r_offset > b->rela->r_offset)
8117 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8119 asection *dynamic_relocs;
8122 bfd_size_type count, size;
8123 size_t i, ret, sort_elt, ext_size;
8124 bfd_byte *sort, *s_non_relative, *p;
8125 struct elf_link_sort_rela *sq;
8126 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8127 int i2e = bed->s->int_rels_per_ext_rel;
8128 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8129 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8130 struct bfd_link_order *lo;
8132 bfd_boolean use_rela;
8134 /* Find a dynamic reloc section. */
8135 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8136 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8137 if (rela_dyn != NULL && rela_dyn->size > 0
8138 && rel_dyn != NULL && rel_dyn->size > 0)
8140 bfd_boolean use_rela_initialised = FALSE;
8142 /* This is just here to stop gcc from complaining.
8143 It's initialization checking code is not perfect. */
8146 /* Both sections are present. Examine the sizes
8147 of the indirect sections to help us choose. */
8148 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8149 if (lo->type == bfd_indirect_link_order)
8151 asection *o = lo->u.indirect.section;
8153 if ((o->size % bed->s->sizeof_rela) == 0)
8155 if ((o->size % bed->s->sizeof_rel) == 0)
8156 /* Section size is divisible by both rel and rela sizes.
8157 It is of no help to us. */
8161 /* Section size is only divisible by rela. */
8162 if (use_rela_initialised && (use_rela == FALSE))
8165 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8166 bfd_set_error (bfd_error_invalid_operation);
8172 use_rela_initialised = TRUE;
8176 else if ((o->size % bed->s->sizeof_rel) == 0)
8178 /* Section size is only divisible by rel. */
8179 if (use_rela_initialised && (use_rela == TRUE))
8182 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8183 bfd_set_error (bfd_error_invalid_operation);
8189 use_rela_initialised = TRUE;
8194 /* The section size is not divisible by either - something is wrong. */
8196 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8197 bfd_set_error (bfd_error_invalid_operation);
8202 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8203 if (lo->type == bfd_indirect_link_order)
8205 asection *o = lo->u.indirect.section;
8207 if ((o->size % bed->s->sizeof_rela) == 0)
8209 if ((o->size % bed->s->sizeof_rel) == 0)
8210 /* Section size is divisible by both rel and rela sizes.
8211 It is of no help to us. */
8215 /* Section size is only divisible by rela. */
8216 if (use_rela_initialised && (use_rela == FALSE))
8219 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8220 bfd_set_error (bfd_error_invalid_operation);
8226 use_rela_initialised = TRUE;
8230 else if ((o->size % bed->s->sizeof_rel) == 0)
8232 /* Section size is only divisible by rel. */
8233 if (use_rela_initialised && (use_rela == TRUE))
8236 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8237 bfd_set_error (bfd_error_invalid_operation);
8243 use_rela_initialised = TRUE;
8248 /* The section size is not divisible by either - something is wrong. */
8250 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8251 bfd_set_error (bfd_error_invalid_operation);
8256 if (! use_rela_initialised)
8260 else if (rela_dyn != NULL && rela_dyn->size > 0)
8262 else if (rel_dyn != NULL && rel_dyn->size > 0)
8269 dynamic_relocs = rela_dyn;
8270 ext_size = bed->s->sizeof_rela;
8271 swap_in = bed->s->swap_reloca_in;
8272 swap_out = bed->s->swap_reloca_out;
8276 dynamic_relocs = rel_dyn;
8277 ext_size = bed->s->sizeof_rel;
8278 swap_in = bed->s->swap_reloc_in;
8279 swap_out = bed->s->swap_reloc_out;
8283 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8284 if (lo->type == bfd_indirect_link_order)
8285 size += lo->u.indirect.section->size;
8287 if (size != dynamic_relocs->size)
8290 sort_elt = (sizeof (struct elf_link_sort_rela)
8291 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8293 count = dynamic_relocs->size / ext_size;
8296 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8300 (*info->callbacks->warning)
8301 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8305 if (bed->s->arch_size == 32)
8306 r_sym_mask = ~(bfd_vma) 0xff;
8308 r_sym_mask = ~(bfd_vma) 0xffffffff;
8310 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8311 if (lo->type == bfd_indirect_link_order)
8313 bfd_byte *erel, *erelend;
8314 asection *o = lo->u.indirect.section;
8316 if (o->contents == NULL && o->size != 0)
8318 /* This is a reloc section that is being handled as a normal
8319 section. See bfd_section_from_shdr. We can't combine
8320 relocs in this case. */
8325 erelend = o->contents + o->size;
8326 /* FIXME: octets_per_byte. */
8327 p = sort + o->output_offset / ext_size * sort_elt;
8329 while (erel < erelend)
8331 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8333 (*swap_in) (abfd, erel, s->rela);
8334 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8335 s->u.sym_mask = r_sym_mask;
8341 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8343 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8345 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8346 if (s->type != reloc_class_relative)
8352 sq = (struct elf_link_sort_rela *) s_non_relative;
8353 for (; i < count; i++, p += sort_elt)
8355 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8356 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8358 sp->u.offset = sq->rela->r_offset;
8361 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8363 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8364 if (lo->type == bfd_indirect_link_order)
8366 bfd_byte *erel, *erelend;
8367 asection *o = lo->u.indirect.section;
8370 erelend = o->contents + o->size;
8371 /* FIXME: octets_per_byte. */
8372 p = sort + o->output_offset / ext_size * sort_elt;
8373 while (erel < erelend)
8375 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8376 (*swap_out) (abfd, s->rela, erel);
8383 *psec = dynamic_relocs;
8387 /* Flush the output symbols to the file. */
8390 elf_link_flush_output_syms (struct elf_final_link_info *flinfo,
8391 const struct elf_backend_data *bed)
8393 if (flinfo->symbuf_count > 0)
8395 Elf_Internal_Shdr *hdr;
8399 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8400 pos = hdr->sh_offset + hdr->sh_size;
8401 amt = flinfo->symbuf_count * bed->s->sizeof_sym;
8402 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) != 0
8403 || bfd_bwrite (flinfo->symbuf, amt, flinfo->output_bfd) != amt)
8406 hdr->sh_size += amt;
8407 flinfo->symbuf_count = 0;
8413 /* Add a symbol to the output symbol table. */
8416 elf_link_output_sym (struct elf_final_link_info *flinfo,
8418 Elf_Internal_Sym *elfsym,
8419 asection *input_sec,
8420 struct elf_link_hash_entry *h)
8423 Elf_External_Sym_Shndx *destshndx;
8424 int (*output_symbol_hook)
8425 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8426 struct elf_link_hash_entry *);
8427 const struct elf_backend_data *bed;
8429 bed = get_elf_backend_data (flinfo->output_bfd);
8430 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8431 if (output_symbol_hook != NULL)
8433 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8438 if (name == NULL || *name == '\0')
8439 elfsym->st_name = 0;
8440 else if (input_sec->flags & SEC_EXCLUDE)
8441 elfsym->st_name = 0;
8444 elfsym->st_name = (unsigned long) _bfd_stringtab_add (flinfo->symstrtab,
8446 if (elfsym->st_name == (unsigned long) -1)
8450 if (flinfo->symbuf_count >= flinfo->symbuf_size)
8452 if (! elf_link_flush_output_syms (flinfo, bed))
8456 dest = flinfo->symbuf + flinfo->symbuf_count * bed->s->sizeof_sym;
8457 destshndx = flinfo->symshndxbuf;
8458 if (destshndx != NULL)
8460 if (bfd_get_symcount (flinfo->output_bfd) >= flinfo->shndxbuf_size)
8464 amt = flinfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8465 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8467 if (destshndx == NULL)
8469 flinfo->symshndxbuf = destshndx;
8470 memset ((char *) destshndx + amt, 0, amt);
8471 flinfo->shndxbuf_size *= 2;
8473 destshndx += bfd_get_symcount (flinfo->output_bfd);
8476 bed->s->swap_symbol_out (flinfo->output_bfd, elfsym, dest, destshndx);
8477 flinfo->symbuf_count += 1;
8478 bfd_get_symcount (flinfo->output_bfd) += 1;
8483 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8486 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8488 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8489 && sym->st_shndx < SHN_LORESERVE)
8491 /* The gABI doesn't support dynamic symbols in output sections
8493 (*_bfd_error_handler)
8494 (_("%B: Too many sections: %d (>= %d)"),
8495 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8496 bfd_set_error (bfd_error_nonrepresentable_section);
8502 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8503 allowing an unsatisfied unversioned symbol in the DSO to match a
8504 versioned symbol that would normally require an explicit version.
8505 We also handle the case that a DSO references a hidden symbol
8506 which may be satisfied by a versioned symbol in another DSO. */
8509 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8510 const struct elf_backend_data *bed,
8511 struct elf_link_hash_entry *h)
8514 struct elf_link_loaded_list *loaded;
8516 if (!is_elf_hash_table (info->hash))
8519 /* Check indirect symbol. */
8520 while (h->root.type == bfd_link_hash_indirect)
8521 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8523 switch (h->root.type)
8529 case bfd_link_hash_undefined:
8530 case bfd_link_hash_undefweak:
8531 abfd = h->root.u.undef.abfd;
8532 if ((abfd->flags & DYNAMIC) == 0
8533 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8537 case bfd_link_hash_defined:
8538 case bfd_link_hash_defweak:
8539 abfd = h->root.u.def.section->owner;
8542 case bfd_link_hash_common:
8543 abfd = h->root.u.c.p->section->owner;
8546 BFD_ASSERT (abfd != NULL);
8548 for (loaded = elf_hash_table (info)->loaded;
8550 loaded = loaded->next)
8553 Elf_Internal_Shdr *hdr;
8554 bfd_size_type symcount;
8555 bfd_size_type extsymcount;
8556 bfd_size_type extsymoff;
8557 Elf_Internal_Shdr *versymhdr;
8558 Elf_Internal_Sym *isym;
8559 Elf_Internal_Sym *isymend;
8560 Elf_Internal_Sym *isymbuf;
8561 Elf_External_Versym *ever;
8562 Elf_External_Versym *extversym;
8564 input = loaded->abfd;
8566 /* We check each DSO for a possible hidden versioned definition. */
8568 || (input->flags & DYNAMIC) == 0
8569 || elf_dynversym (input) == 0)
8572 hdr = &elf_tdata (input)->dynsymtab_hdr;
8574 symcount = hdr->sh_size / bed->s->sizeof_sym;
8575 if (elf_bad_symtab (input))
8577 extsymcount = symcount;
8582 extsymcount = symcount - hdr->sh_info;
8583 extsymoff = hdr->sh_info;
8586 if (extsymcount == 0)
8589 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8591 if (isymbuf == NULL)
8594 /* Read in any version definitions. */
8595 versymhdr = &elf_tdata (input)->dynversym_hdr;
8596 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8597 if (extversym == NULL)
8600 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8601 || (bfd_bread (extversym, versymhdr->sh_size, input)
8602 != versymhdr->sh_size))
8610 ever = extversym + extsymoff;
8611 isymend = isymbuf + extsymcount;
8612 for (isym = isymbuf; isym < isymend; isym++, ever++)
8615 Elf_Internal_Versym iver;
8616 unsigned short version_index;
8618 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8619 || isym->st_shndx == SHN_UNDEF)
8622 name = bfd_elf_string_from_elf_section (input,
8625 if (strcmp (name, h->root.root.string) != 0)
8628 _bfd_elf_swap_versym_in (input, ever, &iver);
8630 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8632 && h->forced_local))
8634 /* If we have a non-hidden versioned sym, then it should
8635 have provided a definition for the undefined sym unless
8636 it is defined in a non-shared object and forced local.
8641 version_index = iver.vs_vers & VERSYM_VERSION;
8642 if (version_index == 1 || version_index == 2)
8644 /* This is the base or first version. We can use it. */
8658 /* Add an external symbol to the symbol table. This is called from
8659 the hash table traversal routine. When generating a shared object,
8660 we go through the symbol table twice. The first time we output
8661 anything that might have been forced to local scope in a version
8662 script. The second time we output the symbols that are still
8666 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
8668 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
8669 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8670 struct elf_final_link_info *flinfo = eoinfo->flinfo;
8672 Elf_Internal_Sym sym;
8673 asection *input_sec;
8674 const struct elf_backend_data *bed;
8678 if (h->root.type == bfd_link_hash_warning)
8680 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8681 if (h->root.type == bfd_link_hash_new)
8685 /* Decide whether to output this symbol in this pass. */
8686 if (eoinfo->localsyms)
8688 if (!h->forced_local)
8690 if (eoinfo->second_pass
8691 && !((h->root.type == bfd_link_hash_defined
8692 || h->root.type == bfd_link_hash_defweak)
8693 && h->root.u.def.section->output_section != NULL))
8698 if (h->forced_local)
8702 bed = get_elf_backend_data (flinfo->output_bfd);
8704 if (h->root.type == bfd_link_hash_undefined)
8706 /* If we have an undefined symbol reference here then it must have
8707 come from a shared library that is being linked in. (Undefined
8708 references in regular files have already been handled unless
8709 they are in unreferenced sections which are removed by garbage
8711 bfd_boolean ignore_undef = FALSE;
8713 /* Some symbols may be special in that the fact that they're
8714 undefined can be safely ignored - let backend determine that. */
8715 if (bed->elf_backend_ignore_undef_symbol)
8716 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8718 /* If we are reporting errors for this situation then do so now. */
8721 && (!h->ref_regular || flinfo->info->gc_sections)
8722 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
8723 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8725 if (!(flinfo->info->callbacks->undefined_symbol
8726 (flinfo->info, h->root.root.string,
8727 h->ref_regular ? NULL : h->root.u.undef.abfd,
8729 (flinfo->info->unresolved_syms_in_shared_libs
8730 == RM_GENERATE_ERROR))))
8732 bfd_set_error (bfd_error_bad_value);
8733 eoinfo->failed = TRUE;
8739 /* We should also warn if a forced local symbol is referenced from
8740 shared libraries. */
8741 if (!flinfo->info->relocatable
8742 && flinfo->info->executable
8747 && h->ref_dynamic_nonweak
8748 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
8752 struct elf_link_hash_entry *hi = h;
8754 /* Check indirect symbol. */
8755 while (hi->root.type == bfd_link_hash_indirect)
8756 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
8758 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
8759 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
8760 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
8761 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
8763 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
8764 def_bfd = flinfo->output_bfd;
8765 if (hi->root.u.def.section != bfd_abs_section_ptr)
8766 def_bfd = hi->root.u.def.section->owner;
8767 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
8768 h->root.root.string);
8769 bfd_set_error (bfd_error_bad_value);
8770 eoinfo->failed = TRUE;
8774 /* We don't want to output symbols that have never been mentioned by
8775 a regular file, or that we have been told to strip. However, if
8776 h->indx is set to -2, the symbol is used by a reloc and we must
8780 else if ((h->def_dynamic
8782 || h->root.type == bfd_link_hash_new)
8786 else if (flinfo->info->strip == strip_all)
8788 else if (flinfo->info->strip == strip_some
8789 && bfd_hash_lookup (flinfo->info->keep_hash,
8790 h->root.root.string, FALSE, FALSE) == NULL)
8792 else if ((h->root.type == bfd_link_hash_defined
8793 || h->root.type == bfd_link_hash_defweak)
8794 && ((flinfo->info->strip_discarded
8795 && discarded_section (h->root.u.def.section))
8796 || (h->root.u.def.section->owner != NULL
8797 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
8799 else if ((h->root.type == bfd_link_hash_undefined
8800 || h->root.type == bfd_link_hash_undefweak)
8801 && h->root.u.undef.abfd != NULL
8802 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
8807 /* If we're stripping it, and it's not a dynamic symbol, there's
8808 nothing else to do unless it is a forced local symbol or a
8809 STT_GNU_IFUNC symbol. */
8812 && h->type != STT_GNU_IFUNC
8813 && !h->forced_local)
8817 sym.st_size = h->size;
8818 sym.st_other = h->other;
8819 if (h->forced_local)
8821 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8822 /* Turn off visibility on local symbol. */
8823 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8825 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
8826 else if (h->unique_global && h->def_regular)
8827 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8828 else if (h->root.type == bfd_link_hash_undefweak
8829 || h->root.type == bfd_link_hash_defweak)
8830 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8832 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8833 sym.st_target_internal = h->target_internal;
8835 switch (h->root.type)
8838 case bfd_link_hash_new:
8839 case bfd_link_hash_warning:
8843 case bfd_link_hash_undefined:
8844 case bfd_link_hash_undefweak:
8845 input_sec = bfd_und_section_ptr;
8846 sym.st_shndx = SHN_UNDEF;
8849 case bfd_link_hash_defined:
8850 case bfd_link_hash_defweak:
8852 input_sec = h->root.u.def.section;
8853 if (input_sec->output_section != NULL)
8855 if (eoinfo->localsyms && flinfo->filesym_count == 1)
8857 bfd_boolean second_pass_sym
8858 = (input_sec->owner == flinfo->output_bfd
8859 || input_sec->owner == NULL
8860 || (input_sec->flags & SEC_LINKER_CREATED) != 0
8861 || (input_sec->owner->flags & BFD_LINKER_CREATED) != 0);
8863 eoinfo->need_second_pass |= second_pass_sym;
8864 if (eoinfo->second_pass != second_pass_sym)
8869 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
8870 input_sec->output_section);
8871 if (sym.st_shndx == SHN_BAD)
8873 (*_bfd_error_handler)
8874 (_("%B: could not find output section %A for input section %A"),
8875 flinfo->output_bfd, input_sec->output_section, input_sec);
8876 bfd_set_error (bfd_error_nonrepresentable_section);
8877 eoinfo->failed = TRUE;
8881 /* ELF symbols in relocatable files are section relative,
8882 but in nonrelocatable files they are virtual
8884 sym.st_value = h->root.u.def.value + input_sec->output_offset;
8885 if (!flinfo->info->relocatable)
8887 sym.st_value += input_sec->output_section->vma;
8888 if (h->type == STT_TLS)
8890 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
8891 if (tls_sec != NULL)
8892 sym.st_value -= tls_sec->vma;
8895 /* The TLS section may have been garbage collected. */
8896 BFD_ASSERT (flinfo->info->gc_sections
8897 && !input_sec->gc_mark);
8904 BFD_ASSERT (input_sec->owner == NULL
8905 || (input_sec->owner->flags & DYNAMIC) != 0);
8906 sym.st_shndx = SHN_UNDEF;
8907 input_sec = bfd_und_section_ptr;
8912 case bfd_link_hash_common:
8913 input_sec = h->root.u.c.p->section;
8914 sym.st_shndx = bed->common_section_index (input_sec);
8915 sym.st_value = 1 << h->root.u.c.p->alignment_power;
8918 case bfd_link_hash_indirect:
8919 /* These symbols are created by symbol versioning. They point
8920 to the decorated version of the name. For example, if the
8921 symbol foo@@GNU_1.2 is the default, which should be used when
8922 foo is used with no version, then we add an indirect symbol
8923 foo which points to foo@@GNU_1.2. We ignore these symbols,
8924 since the indirected symbol is already in the hash table. */
8928 /* Give the processor backend a chance to tweak the symbol value,
8929 and also to finish up anything that needs to be done for this
8930 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8931 forced local syms when non-shared is due to a historical quirk.
8932 STT_GNU_IFUNC symbol must go through PLT. */
8933 if ((h->type == STT_GNU_IFUNC
8935 && !flinfo->info->relocatable)
8936 || ((h->dynindx != -1
8938 && ((flinfo->info->shared
8939 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
8940 || h->root.type != bfd_link_hash_undefweak))
8941 || !h->forced_local)
8942 && elf_hash_table (flinfo->info)->dynamic_sections_created))
8944 if (! ((*bed->elf_backend_finish_dynamic_symbol)
8945 (flinfo->output_bfd, flinfo->info, h, &sym)))
8947 eoinfo->failed = TRUE;
8952 /* If we are marking the symbol as undefined, and there are no
8953 non-weak references to this symbol from a regular object, then
8954 mark the symbol as weak undefined; if there are non-weak
8955 references, mark the symbol as strong. We can't do this earlier,
8956 because it might not be marked as undefined until the
8957 finish_dynamic_symbol routine gets through with it. */
8958 if (sym.st_shndx == SHN_UNDEF
8960 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
8961 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
8964 unsigned int type = ELF_ST_TYPE (sym.st_info);
8966 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8967 if (type == STT_GNU_IFUNC)
8970 if (h->ref_regular_nonweak)
8971 bindtype = STB_GLOBAL;
8973 bindtype = STB_WEAK;
8974 sym.st_info = ELF_ST_INFO (bindtype, type);
8977 /* If this is a symbol defined in a dynamic library, don't use the
8978 symbol size from the dynamic library. Relinking an executable
8979 against a new library may introduce gratuitous changes in the
8980 executable's symbols if we keep the size. */
8981 if (sym.st_shndx == SHN_UNDEF
8986 /* If a non-weak symbol with non-default visibility is not defined
8987 locally, it is a fatal error. */
8988 if (!flinfo->info->relocatable
8989 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
8990 && ELF_ST_BIND (sym.st_info) != STB_WEAK
8991 && h->root.type == bfd_link_hash_undefined
8996 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
8997 msg = _("%B: protected symbol `%s' isn't defined");
8998 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
8999 msg = _("%B: internal symbol `%s' isn't defined");
9001 msg = _("%B: hidden symbol `%s' isn't defined");
9002 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
9003 bfd_set_error (bfd_error_bad_value);
9004 eoinfo->failed = TRUE;
9008 /* If this symbol should be put in the .dynsym section, then put it
9009 there now. We already know the symbol index. We also fill in
9010 the entry in the .hash section. */
9011 if (flinfo->dynsym_sec != NULL
9013 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9017 /* Since there is no version information in the dynamic string,
9018 if there is no version info in symbol version section, we will
9019 have a run-time problem. */
9020 if (h->verinfo.verdef == NULL)
9022 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9024 if (p && p [1] != '\0')
9026 (*_bfd_error_handler)
9027 (_("%B: No symbol version section for versioned symbol `%s'"),
9028 flinfo->output_bfd, h->root.root.string);
9029 eoinfo->failed = TRUE;
9034 sym.st_name = h->dynstr_index;
9035 esym = flinfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
9036 if (!check_dynsym (flinfo->output_bfd, &sym))
9038 eoinfo->failed = TRUE;
9041 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9043 if (flinfo->hash_sec != NULL)
9045 size_t hash_entry_size;
9046 bfd_byte *bucketpos;
9051 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9052 bucket = h->u.elf_hash_value % bucketcount;
9055 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9056 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9057 + (bucket + 2) * hash_entry_size);
9058 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9059 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9061 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9062 ((bfd_byte *) flinfo->hash_sec->contents
9063 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9066 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9068 Elf_Internal_Versym iversym;
9069 Elf_External_Versym *eversym;
9071 if (!h->def_regular)
9073 if (h->verinfo.verdef == NULL)
9074 iversym.vs_vers = 0;
9076 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9080 if (h->verinfo.vertree == NULL)
9081 iversym.vs_vers = 1;
9083 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9084 if (flinfo->info->create_default_symver)
9089 iversym.vs_vers |= VERSYM_HIDDEN;
9091 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9092 eversym += h->dynindx;
9093 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9097 /* If we're stripping it, then it was just a dynamic symbol, and
9098 there's nothing else to do. */
9099 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
9102 indx = bfd_get_symcount (flinfo->output_bfd);
9103 ret = elf_link_output_sym (flinfo, h->root.root.string, &sym, input_sec, h);
9106 eoinfo->failed = TRUE;
9111 else if (h->indx == -2)
9117 /* Return TRUE if special handling is done for relocs in SEC against
9118 symbols defined in discarded sections. */
9121 elf_section_ignore_discarded_relocs (asection *sec)
9123 const struct elf_backend_data *bed;
9125 switch (sec->sec_info_type)
9127 case SEC_INFO_TYPE_STABS:
9128 case SEC_INFO_TYPE_EH_FRAME:
9134 bed = get_elf_backend_data (sec->owner);
9135 if (bed->elf_backend_ignore_discarded_relocs != NULL
9136 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9142 /* Return a mask saying how ld should treat relocations in SEC against
9143 symbols defined in discarded sections. If this function returns
9144 COMPLAIN set, ld will issue a warning message. If this function
9145 returns PRETEND set, and the discarded section was link-once and the
9146 same size as the kept link-once section, ld will pretend that the
9147 symbol was actually defined in the kept section. Otherwise ld will
9148 zero the reloc (at least that is the intent, but some cooperation by
9149 the target dependent code is needed, particularly for REL targets). */
9152 _bfd_elf_default_action_discarded (asection *sec)
9154 if (sec->flags & SEC_DEBUGGING)
9157 if (strcmp (".eh_frame", sec->name) == 0)
9160 if (strcmp (".gcc_except_table", sec->name) == 0)
9163 return COMPLAIN | PRETEND;
9166 /* Find a match between a section and a member of a section group. */
9169 match_group_member (asection *sec, asection *group,
9170 struct bfd_link_info *info)
9172 asection *first = elf_next_in_group (group);
9173 asection *s = first;
9177 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9180 s = elf_next_in_group (s);
9188 /* Check if the kept section of a discarded section SEC can be used
9189 to replace it. Return the replacement if it is OK. Otherwise return
9193 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9197 kept = sec->kept_section;
9200 if ((kept->flags & SEC_GROUP) != 0)
9201 kept = match_group_member (sec, kept, info);
9203 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9204 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9206 sec->kept_section = kept;
9211 /* Link an input file into the linker output file. This function
9212 handles all the sections and relocations of the input file at once.
9213 This is so that we only have to read the local symbols once, and
9214 don't have to keep them in memory. */
9217 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9219 int (*relocate_section)
9220 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9221 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9223 Elf_Internal_Shdr *symtab_hdr;
9226 Elf_Internal_Sym *isymbuf;
9227 Elf_Internal_Sym *isym;
9228 Elf_Internal_Sym *isymend;
9230 asection **ppsection;
9232 const struct elf_backend_data *bed;
9233 struct elf_link_hash_entry **sym_hashes;
9234 bfd_size_type address_size;
9235 bfd_vma r_type_mask;
9237 bfd_boolean have_file_sym = FALSE;
9239 output_bfd = flinfo->output_bfd;
9240 bed = get_elf_backend_data (output_bfd);
9241 relocate_section = bed->elf_backend_relocate_section;
9243 /* If this is a dynamic object, we don't want to do anything here:
9244 we don't want the local symbols, and we don't want the section
9246 if ((input_bfd->flags & DYNAMIC) != 0)
9249 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9250 if (elf_bad_symtab (input_bfd))
9252 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9257 locsymcount = symtab_hdr->sh_info;
9258 extsymoff = symtab_hdr->sh_info;
9261 /* Read the local symbols. */
9262 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9263 if (isymbuf == NULL && locsymcount != 0)
9265 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9266 flinfo->internal_syms,
9267 flinfo->external_syms,
9268 flinfo->locsym_shndx);
9269 if (isymbuf == NULL)
9273 /* Find local symbol sections and adjust values of symbols in
9274 SEC_MERGE sections. Write out those local symbols we know are
9275 going into the output file. */
9276 isymend = isymbuf + locsymcount;
9277 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9279 isym++, pindex++, ppsection++)
9283 Elf_Internal_Sym osym;
9289 if (elf_bad_symtab (input_bfd))
9291 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9298 if (isym->st_shndx == SHN_UNDEF)
9299 isec = bfd_und_section_ptr;
9300 else if (isym->st_shndx == SHN_ABS)
9301 isec = bfd_abs_section_ptr;
9302 else if (isym->st_shndx == SHN_COMMON)
9303 isec = bfd_com_section_ptr;
9306 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9309 /* Don't attempt to output symbols with st_shnx in the
9310 reserved range other than SHN_ABS and SHN_COMMON. */
9314 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9315 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9317 _bfd_merged_section_offset (output_bfd, &isec,
9318 elf_section_data (isec)->sec_info,
9324 /* Don't output the first, undefined, symbol. */
9325 if (ppsection == flinfo->sections)
9328 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9330 /* We never output section symbols. Instead, we use the
9331 section symbol of the corresponding section in the output
9336 /* If we are stripping all symbols, we don't want to output this
9338 if (flinfo->info->strip == strip_all)
9341 /* If we are discarding all local symbols, we don't want to
9342 output this one. If we are generating a relocatable output
9343 file, then some of the local symbols may be required by
9344 relocs; we output them below as we discover that they are
9346 if (flinfo->info->discard == discard_all)
9349 /* If this symbol is defined in a section which we are
9350 discarding, we don't need to keep it. */
9351 if (isym->st_shndx != SHN_UNDEF
9352 && isym->st_shndx < SHN_LORESERVE
9353 && bfd_section_removed_from_list (output_bfd,
9354 isec->output_section))
9357 /* Get the name of the symbol. */
9358 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9363 /* See if we are discarding symbols with this name. */
9364 if ((flinfo->info->strip == strip_some
9365 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9367 || (((flinfo->info->discard == discard_sec_merge
9368 && (isec->flags & SEC_MERGE) && !flinfo->info->relocatable)
9369 || flinfo->info->discard == discard_l)
9370 && bfd_is_local_label_name (input_bfd, name)))
9373 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9375 have_file_sym = TRUE;
9376 flinfo->filesym_count += 1;
9380 /* In the absence of debug info, bfd_find_nearest_line uses
9381 FILE symbols to determine the source file for local
9382 function symbols. Provide a FILE symbol here if input
9383 files lack such, so that their symbols won't be
9384 associated with a previous input file. It's not the
9385 source file, but the best we can do. */
9386 have_file_sym = TRUE;
9387 flinfo->filesym_count += 1;
9388 memset (&osym, 0, sizeof (osym));
9389 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9390 osym.st_shndx = SHN_ABS;
9391 if (!elf_link_output_sym (flinfo, input_bfd->filename, &osym,
9392 bfd_abs_section_ptr, NULL))
9398 /* Adjust the section index for the output file. */
9399 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9400 isec->output_section);
9401 if (osym.st_shndx == SHN_BAD)
9404 /* ELF symbols in relocatable files are section relative, but
9405 in executable files they are virtual addresses. Note that
9406 this code assumes that all ELF sections have an associated
9407 BFD section with a reasonable value for output_offset; below
9408 we assume that they also have a reasonable value for
9409 output_section. Any special sections must be set up to meet
9410 these requirements. */
9411 osym.st_value += isec->output_offset;
9412 if (!flinfo->info->relocatable)
9414 osym.st_value += isec->output_section->vma;
9415 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9417 /* STT_TLS symbols are relative to PT_TLS segment base. */
9418 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9419 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9423 indx = bfd_get_symcount (output_bfd);
9424 ret = elf_link_output_sym (flinfo, name, &osym, isec, NULL);
9431 if (bed->s->arch_size == 32)
9439 r_type_mask = 0xffffffff;
9444 /* Relocate the contents of each section. */
9445 sym_hashes = elf_sym_hashes (input_bfd);
9446 for (o = input_bfd->sections; o != NULL; o = o->next)
9450 if (! o->linker_mark)
9452 /* This section was omitted from the link. */
9456 if (flinfo->info->relocatable
9457 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9459 /* Deal with the group signature symbol. */
9460 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9461 unsigned long symndx = sec_data->this_hdr.sh_info;
9462 asection *osec = o->output_section;
9464 if (symndx >= locsymcount
9465 || (elf_bad_symtab (input_bfd)
9466 && flinfo->sections[symndx] == NULL))
9468 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9469 while (h->root.type == bfd_link_hash_indirect
9470 || h->root.type == bfd_link_hash_warning)
9471 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9472 /* Arrange for symbol to be output. */
9474 elf_section_data (osec)->this_hdr.sh_info = -2;
9476 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9478 /* We'll use the output section target_index. */
9479 asection *sec = flinfo->sections[symndx]->output_section;
9480 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9484 if (flinfo->indices[symndx] == -1)
9486 /* Otherwise output the local symbol now. */
9487 Elf_Internal_Sym sym = isymbuf[symndx];
9488 asection *sec = flinfo->sections[symndx]->output_section;
9493 name = bfd_elf_string_from_elf_section (input_bfd,
9494 symtab_hdr->sh_link,
9499 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9501 if (sym.st_shndx == SHN_BAD)
9504 sym.st_value += o->output_offset;
9506 indx = bfd_get_symcount (output_bfd);
9507 ret = elf_link_output_sym (flinfo, name, &sym, o, NULL);
9511 flinfo->indices[symndx] = indx;
9515 elf_section_data (osec)->this_hdr.sh_info
9516 = flinfo->indices[symndx];
9520 if ((o->flags & SEC_HAS_CONTENTS) == 0
9521 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9524 if ((o->flags & SEC_LINKER_CREATED) != 0)
9526 /* Section was created by _bfd_elf_link_create_dynamic_sections
9531 /* Get the contents of the section. They have been cached by a
9532 relaxation routine. Note that o is a section in an input
9533 file, so the contents field will not have been set by any of
9534 the routines which work on output files. */
9535 if (elf_section_data (o)->this_hdr.contents != NULL)
9536 contents = elf_section_data (o)->this_hdr.contents;
9539 contents = flinfo->contents;
9540 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9544 if ((o->flags & SEC_RELOC) != 0)
9546 Elf_Internal_Rela *internal_relocs;
9547 Elf_Internal_Rela *rel, *relend;
9548 int action_discarded;
9551 /* Get the swapped relocs. */
9553 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
9554 flinfo->internal_relocs, FALSE);
9555 if (internal_relocs == NULL
9556 && o->reloc_count > 0)
9559 /* We need to reverse-copy input .ctors/.dtors sections if
9560 they are placed in .init_array/.finit_array for output. */
9561 if (o->size > address_size
9562 && ((strncmp (o->name, ".ctors", 6) == 0
9563 && strcmp (o->output_section->name,
9564 ".init_array") == 0)
9565 || (strncmp (o->name, ".dtors", 6) == 0
9566 && strcmp (o->output_section->name,
9567 ".fini_array") == 0))
9568 && (o->name[6] == 0 || o->name[6] == '.'))
9570 if (o->size != o->reloc_count * address_size)
9572 (*_bfd_error_handler)
9573 (_("error: %B: size of section %A is not "
9574 "multiple of address size"),
9576 bfd_set_error (bfd_error_on_input);
9579 o->flags |= SEC_ELF_REVERSE_COPY;
9582 action_discarded = -1;
9583 if (!elf_section_ignore_discarded_relocs (o))
9584 action_discarded = (*bed->action_discarded) (o);
9586 /* Run through the relocs evaluating complex reloc symbols and
9587 looking for relocs against symbols from discarded sections
9588 or section symbols from removed link-once sections.
9589 Complain about relocs against discarded sections. Zero
9590 relocs against removed link-once sections. */
9592 rel = internal_relocs;
9593 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9594 for ( ; rel < relend; rel++)
9596 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9597 unsigned int s_type;
9598 asection **ps, *sec;
9599 struct elf_link_hash_entry *h = NULL;
9600 const char *sym_name;
9602 if (r_symndx == STN_UNDEF)
9605 if (r_symndx >= locsymcount
9606 || (elf_bad_symtab (input_bfd)
9607 && flinfo->sections[r_symndx] == NULL))
9609 h = sym_hashes[r_symndx - extsymoff];
9611 /* Badly formatted input files can contain relocs that
9612 reference non-existant symbols. Check here so that
9613 we do not seg fault. */
9618 sprintf_vma (buffer, rel->r_info);
9619 (*_bfd_error_handler)
9620 (_("error: %B contains a reloc (0x%s) for section %A "
9621 "that references a non-existent global symbol"),
9622 input_bfd, o, buffer);
9623 bfd_set_error (bfd_error_bad_value);
9627 while (h->root.type == bfd_link_hash_indirect
9628 || h->root.type == bfd_link_hash_warning)
9629 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9634 if (h->root.type == bfd_link_hash_defined
9635 || h->root.type == bfd_link_hash_defweak)
9636 ps = &h->root.u.def.section;
9638 sym_name = h->root.root.string;
9642 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9644 s_type = ELF_ST_TYPE (sym->st_info);
9645 ps = &flinfo->sections[r_symndx];
9646 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9650 if ((s_type == STT_RELC || s_type == STT_SRELC)
9651 && !flinfo->info->relocatable)
9654 bfd_vma dot = (rel->r_offset
9655 + o->output_offset + o->output_section->vma);
9657 printf ("Encountered a complex symbol!");
9658 printf (" (input_bfd %s, section %s, reloc %ld\n",
9659 input_bfd->filename, o->name,
9660 (long) (rel - internal_relocs));
9661 printf (" symbol: idx %8.8lx, name %s\n",
9662 r_symndx, sym_name);
9663 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9664 (unsigned long) rel->r_info,
9665 (unsigned long) rel->r_offset);
9667 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
9668 isymbuf, locsymcount, s_type == STT_SRELC))
9671 /* Symbol evaluated OK. Update to absolute value. */
9672 set_symbol_value (input_bfd, isymbuf, locsymcount,
9677 if (action_discarded != -1 && ps != NULL)
9679 /* Complain if the definition comes from a
9680 discarded section. */
9681 if ((sec = *ps) != NULL && discarded_section (sec))
9683 BFD_ASSERT (r_symndx != STN_UNDEF);
9684 if (action_discarded & COMPLAIN)
9685 (*flinfo->info->callbacks->einfo)
9686 (_("%X`%s' referenced in section `%A' of %B: "
9687 "defined in discarded section `%A' of %B\n"),
9688 sym_name, o, input_bfd, sec, sec->owner);
9690 /* Try to do the best we can to support buggy old
9691 versions of gcc. Pretend that the symbol is
9692 really defined in the kept linkonce section.
9693 FIXME: This is quite broken. Modifying the
9694 symbol here means we will be changing all later
9695 uses of the symbol, not just in this section. */
9696 if (action_discarded & PRETEND)
9700 kept = _bfd_elf_check_kept_section (sec,
9712 /* Relocate the section by invoking a back end routine.
9714 The back end routine is responsible for adjusting the
9715 section contents as necessary, and (if using Rela relocs
9716 and generating a relocatable output file) adjusting the
9717 reloc addend as necessary.
9719 The back end routine does not have to worry about setting
9720 the reloc address or the reloc symbol index.
9722 The back end routine is given a pointer to the swapped in
9723 internal symbols, and can access the hash table entries
9724 for the external symbols via elf_sym_hashes (input_bfd).
9726 When generating relocatable output, the back end routine
9727 must handle STB_LOCAL/STT_SECTION symbols specially. The
9728 output symbol is going to be a section symbol
9729 corresponding to the output section, which will require
9730 the addend to be adjusted. */
9732 ret = (*relocate_section) (output_bfd, flinfo->info,
9733 input_bfd, o, contents,
9741 || flinfo->info->relocatable
9742 || flinfo->info->emitrelocations)
9744 Elf_Internal_Rela *irela;
9745 Elf_Internal_Rela *irelaend, *irelamid;
9746 bfd_vma last_offset;
9747 struct elf_link_hash_entry **rel_hash;
9748 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
9749 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
9750 unsigned int next_erel;
9751 bfd_boolean rela_normal;
9752 struct bfd_elf_section_data *esdi, *esdo;
9754 esdi = elf_section_data (o);
9755 esdo = elf_section_data (o->output_section);
9756 rela_normal = FALSE;
9758 /* Adjust the reloc addresses and symbol indices. */
9760 irela = internal_relocs;
9761 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9762 rel_hash = esdo->rel.hashes + esdo->rel.count;
9763 /* We start processing the REL relocs, if any. When we reach
9764 IRELAMID in the loop, we switch to the RELA relocs. */
9766 if (esdi->rel.hdr != NULL)
9767 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
9768 * bed->s->int_rels_per_ext_rel);
9769 rel_hash_list = rel_hash;
9770 rela_hash_list = NULL;
9771 last_offset = o->output_offset;
9772 if (!flinfo->info->relocatable)
9773 last_offset += o->output_section->vma;
9774 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9776 unsigned long r_symndx;
9778 Elf_Internal_Sym sym;
9780 if (next_erel == bed->s->int_rels_per_ext_rel)
9786 if (irela == irelamid)
9788 rel_hash = esdo->rela.hashes + esdo->rela.count;
9789 rela_hash_list = rel_hash;
9790 rela_normal = bed->rela_normal;
9793 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9796 if (irela->r_offset >= (bfd_vma) -2)
9798 /* This is a reloc for a deleted entry or somesuch.
9799 Turn it into an R_*_NONE reloc, at the same
9800 offset as the last reloc. elf_eh_frame.c and
9801 bfd_elf_discard_info rely on reloc offsets
9803 irela->r_offset = last_offset;
9805 irela->r_addend = 0;
9809 irela->r_offset += o->output_offset;
9811 /* Relocs in an executable have to be virtual addresses. */
9812 if (!flinfo->info->relocatable)
9813 irela->r_offset += o->output_section->vma;
9815 last_offset = irela->r_offset;
9817 r_symndx = irela->r_info >> r_sym_shift;
9818 if (r_symndx == STN_UNDEF)
9821 if (r_symndx >= locsymcount
9822 || (elf_bad_symtab (input_bfd)
9823 && flinfo->sections[r_symndx] == NULL))
9825 struct elf_link_hash_entry *rh;
9828 /* This is a reloc against a global symbol. We
9829 have not yet output all the local symbols, so
9830 we do not know the symbol index of any global
9831 symbol. We set the rel_hash entry for this
9832 reloc to point to the global hash table entry
9833 for this symbol. The symbol index is then
9834 set at the end of bfd_elf_final_link. */
9835 indx = r_symndx - extsymoff;
9836 rh = elf_sym_hashes (input_bfd)[indx];
9837 while (rh->root.type == bfd_link_hash_indirect
9838 || rh->root.type == bfd_link_hash_warning)
9839 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
9841 /* Setting the index to -2 tells
9842 elf_link_output_extsym that this symbol is
9844 BFD_ASSERT (rh->indx < 0);
9852 /* This is a reloc against a local symbol. */
9855 sym = isymbuf[r_symndx];
9856 sec = flinfo->sections[r_symndx];
9857 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
9859 /* I suppose the backend ought to fill in the
9860 section of any STT_SECTION symbol against a
9861 processor specific section. */
9862 r_symndx = STN_UNDEF;
9863 if (bfd_is_abs_section (sec))
9865 else if (sec == NULL || sec->owner == NULL)
9867 bfd_set_error (bfd_error_bad_value);
9872 asection *osec = sec->output_section;
9874 /* If we have discarded a section, the output
9875 section will be the absolute section. In
9876 case of discarded SEC_MERGE sections, use
9877 the kept section. relocate_section should
9878 have already handled discarded linkonce
9880 if (bfd_is_abs_section (osec)
9881 && sec->kept_section != NULL
9882 && sec->kept_section->output_section != NULL)
9884 osec = sec->kept_section->output_section;
9885 irela->r_addend -= osec->vma;
9888 if (!bfd_is_abs_section (osec))
9890 r_symndx = osec->target_index;
9891 if (r_symndx == STN_UNDEF)
9893 irela->r_addend += osec->vma;
9894 osec = _bfd_nearby_section (output_bfd, osec,
9896 irela->r_addend -= osec->vma;
9897 r_symndx = osec->target_index;
9902 /* Adjust the addend according to where the
9903 section winds up in the output section. */
9905 irela->r_addend += sec->output_offset;
9909 if (flinfo->indices[r_symndx] == -1)
9911 unsigned long shlink;
9916 if (flinfo->info->strip == strip_all)
9918 /* You can't do ld -r -s. */
9919 bfd_set_error (bfd_error_invalid_operation);
9923 /* This symbol was skipped earlier, but
9924 since it is needed by a reloc, we
9925 must output it now. */
9926 shlink = symtab_hdr->sh_link;
9927 name = (bfd_elf_string_from_elf_section
9928 (input_bfd, shlink, sym.st_name));
9932 osec = sec->output_section;
9934 _bfd_elf_section_from_bfd_section (output_bfd,
9936 if (sym.st_shndx == SHN_BAD)
9939 sym.st_value += sec->output_offset;
9940 if (!flinfo->info->relocatable)
9942 sym.st_value += osec->vma;
9943 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
9945 /* STT_TLS symbols are relative to PT_TLS
9947 BFD_ASSERT (elf_hash_table (flinfo->info)
9949 sym.st_value -= (elf_hash_table (flinfo->info)
9954 indx = bfd_get_symcount (output_bfd);
9955 ret = elf_link_output_sym (flinfo, name, &sym, sec,
9960 flinfo->indices[r_symndx] = indx;
9965 r_symndx = flinfo->indices[r_symndx];
9968 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
9969 | (irela->r_info & r_type_mask));
9972 /* Swap out the relocs. */
9973 input_rel_hdr = esdi->rel.hdr;
9974 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
9976 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9981 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
9982 * bed->s->int_rels_per_ext_rel);
9983 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
9986 input_rela_hdr = esdi->rela.hdr;
9987 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
9989 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9998 /* Write out the modified section contents. */
9999 if (bed->elf_backend_write_section
10000 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
10003 /* Section written out. */
10005 else switch (o->sec_info_type)
10007 case SEC_INFO_TYPE_STABS:
10008 if (! (_bfd_write_section_stabs
10010 &elf_hash_table (flinfo->info)->stab_info,
10011 o, &elf_section_data (o)->sec_info, contents)))
10014 case SEC_INFO_TYPE_MERGE:
10015 if (! _bfd_write_merged_section (output_bfd, o,
10016 elf_section_data (o)->sec_info))
10019 case SEC_INFO_TYPE_EH_FRAME:
10021 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10028 /* FIXME: octets_per_byte. */
10029 if (! (o->flags & SEC_EXCLUDE))
10031 file_ptr offset = (file_ptr) o->output_offset;
10032 bfd_size_type todo = o->size;
10033 if ((o->flags & SEC_ELF_REVERSE_COPY))
10035 /* Reverse-copy input section to output. */
10038 todo -= address_size;
10039 if (! bfd_set_section_contents (output_bfd,
10047 offset += address_size;
10051 else if (! bfd_set_section_contents (output_bfd,
10065 /* Generate a reloc when linking an ELF file. This is a reloc
10066 requested by the linker, and does not come from any input file. This
10067 is used to build constructor and destructor tables when linking
10071 elf_reloc_link_order (bfd *output_bfd,
10072 struct bfd_link_info *info,
10073 asection *output_section,
10074 struct bfd_link_order *link_order)
10076 reloc_howto_type *howto;
10080 struct bfd_elf_section_reloc_data *reldata;
10081 struct elf_link_hash_entry **rel_hash_ptr;
10082 Elf_Internal_Shdr *rel_hdr;
10083 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10084 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10087 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10089 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10092 bfd_set_error (bfd_error_bad_value);
10096 addend = link_order->u.reloc.p->addend;
10099 reldata = &esdo->rel;
10100 else if (esdo->rela.hdr)
10101 reldata = &esdo->rela;
10108 /* Figure out the symbol index. */
10109 rel_hash_ptr = reldata->hashes + reldata->count;
10110 if (link_order->type == bfd_section_reloc_link_order)
10112 indx = link_order->u.reloc.p->u.section->target_index;
10113 BFD_ASSERT (indx != 0);
10114 *rel_hash_ptr = NULL;
10118 struct elf_link_hash_entry *h;
10120 /* Treat a reloc against a defined symbol as though it were
10121 actually against the section. */
10122 h = ((struct elf_link_hash_entry *)
10123 bfd_wrapped_link_hash_lookup (output_bfd, info,
10124 link_order->u.reloc.p->u.name,
10125 FALSE, FALSE, TRUE));
10127 && (h->root.type == bfd_link_hash_defined
10128 || h->root.type == bfd_link_hash_defweak))
10132 section = h->root.u.def.section;
10133 indx = section->output_section->target_index;
10134 *rel_hash_ptr = NULL;
10135 /* It seems that we ought to add the symbol value to the
10136 addend here, but in practice it has already been added
10137 because it was passed to constructor_callback. */
10138 addend += section->output_section->vma + section->output_offset;
10140 else if (h != NULL)
10142 /* Setting the index to -2 tells elf_link_output_extsym that
10143 this symbol is used by a reloc. */
10150 if (! ((*info->callbacks->unattached_reloc)
10151 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10157 /* If this is an inplace reloc, we must write the addend into the
10159 if (howto->partial_inplace && addend != 0)
10161 bfd_size_type size;
10162 bfd_reloc_status_type rstat;
10165 const char *sym_name;
10167 size = (bfd_size_type) bfd_get_reloc_size (howto);
10168 buf = (bfd_byte *) bfd_zmalloc (size);
10171 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10178 case bfd_reloc_outofrange:
10181 case bfd_reloc_overflow:
10182 if (link_order->type == bfd_section_reloc_link_order)
10183 sym_name = bfd_section_name (output_bfd,
10184 link_order->u.reloc.p->u.section);
10186 sym_name = link_order->u.reloc.p->u.name;
10187 if (! ((*info->callbacks->reloc_overflow)
10188 (info, NULL, sym_name, howto->name, addend, NULL,
10189 NULL, (bfd_vma) 0)))
10196 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10197 link_order->offset, size);
10203 /* The address of a reloc is relative to the section in a
10204 relocatable file, and is a virtual address in an executable
10206 offset = link_order->offset;
10207 if (! info->relocatable)
10208 offset += output_section->vma;
10210 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10212 irel[i].r_offset = offset;
10213 irel[i].r_info = 0;
10214 irel[i].r_addend = 0;
10216 if (bed->s->arch_size == 32)
10217 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10219 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10221 rel_hdr = reldata->hdr;
10222 erel = rel_hdr->contents;
10223 if (rel_hdr->sh_type == SHT_REL)
10225 erel += reldata->count * bed->s->sizeof_rel;
10226 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10230 irel[0].r_addend = addend;
10231 erel += reldata->count * bed->s->sizeof_rela;
10232 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10241 /* Get the output vma of the section pointed to by the sh_link field. */
10244 elf_get_linked_section_vma (struct bfd_link_order *p)
10246 Elf_Internal_Shdr **elf_shdrp;
10250 s = p->u.indirect.section;
10251 elf_shdrp = elf_elfsections (s->owner);
10252 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10253 elfsec = elf_shdrp[elfsec]->sh_link;
10255 The Intel C compiler generates SHT_IA_64_UNWIND with
10256 SHF_LINK_ORDER. But it doesn't set the sh_link or
10257 sh_info fields. Hence we could get the situation
10258 where elfsec is 0. */
10261 const struct elf_backend_data *bed
10262 = get_elf_backend_data (s->owner);
10263 if (bed->link_order_error_handler)
10264 bed->link_order_error_handler
10265 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10270 s = elf_shdrp[elfsec]->bfd_section;
10271 return s->output_section->vma + s->output_offset;
10276 /* Compare two sections based on the locations of the sections they are
10277 linked to. Used by elf_fixup_link_order. */
10280 compare_link_order (const void * a, const void * b)
10285 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10286 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10289 return apos > bpos;
10293 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10294 order as their linked sections. Returns false if this could not be done
10295 because an output section includes both ordered and unordered
10296 sections. Ideally we'd do this in the linker proper. */
10299 elf_fixup_link_order (bfd *abfd, asection *o)
10301 int seen_linkorder;
10304 struct bfd_link_order *p;
10306 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10308 struct bfd_link_order **sections;
10309 asection *s, *other_sec, *linkorder_sec;
10313 linkorder_sec = NULL;
10315 seen_linkorder = 0;
10316 for (p = o->map_head.link_order; p != NULL; p = p->next)
10318 if (p->type == bfd_indirect_link_order)
10320 s = p->u.indirect.section;
10322 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10323 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10324 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10325 && elfsec < elf_numsections (sub)
10326 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10327 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10341 if (seen_other && seen_linkorder)
10343 if (other_sec && linkorder_sec)
10344 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10346 linkorder_sec->owner, other_sec,
10349 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10351 bfd_set_error (bfd_error_bad_value);
10356 if (!seen_linkorder)
10359 sections = (struct bfd_link_order **)
10360 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10361 if (sections == NULL)
10363 seen_linkorder = 0;
10365 for (p = o->map_head.link_order; p != NULL; p = p->next)
10367 sections[seen_linkorder++] = p;
10369 /* Sort the input sections in the order of their linked section. */
10370 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10371 compare_link_order);
10373 /* Change the offsets of the sections. */
10375 for (n = 0; n < seen_linkorder; n++)
10377 s = sections[n]->u.indirect.section;
10378 offset &= ~(bfd_vma) 0 << s->alignment_power;
10379 s->output_offset = offset;
10380 sections[n]->offset = offset;
10381 /* FIXME: octets_per_byte. */
10382 offset += sections[n]->size;
10390 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10394 if (flinfo->symstrtab != NULL)
10395 _bfd_stringtab_free (flinfo->symstrtab);
10396 if (flinfo->contents != NULL)
10397 free (flinfo->contents);
10398 if (flinfo->external_relocs != NULL)
10399 free (flinfo->external_relocs);
10400 if (flinfo->internal_relocs != NULL)
10401 free (flinfo->internal_relocs);
10402 if (flinfo->external_syms != NULL)
10403 free (flinfo->external_syms);
10404 if (flinfo->locsym_shndx != NULL)
10405 free (flinfo->locsym_shndx);
10406 if (flinfo->internal_syms != NULL)
10407 free (flinfo->internal_syms);
10408 if (flinfo->indices != NULL)
10409 free (flinfo->indices);
10410 if (flinfo->sections != NULL)
10411 free (flinfo->sections);
10412 if (flinfo->symbuf != NULL)
10413 free (flinfo->symbuf);
10414 if (flinfo->symshndxbuf != NULL)
10415 free (flinfo->symshndxbuf);
10416 for (o = obfd->sections; o != NULL; o = o->next)
10418 struct bfd_elf_section_data *esdo = elf_section_data (o);
10419 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10420 free (esdo->rel.hashes);
10421 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10422 free (esdo->rela.hashes);
10426 /* Do the final step of an ELF link. */
10429 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10431 bfd_boolean dynamic;
10432 bfd_boolean emit_relocs;
10434 struct elf_final_link_info flinfo;
10436 struct bfd_link_order *p;
10438 bfd_size_type max_contents_size;
10439 bfd_size_type max_external_reloc_size;
10440 bfd_size_type max_internal_reloc_count;
10441 bfd_size_type max_sym_count;
10442 bfd_size_type max_sym_shndx_count;
10444 Elf_Internal_Sym elfsym;
10446 Elf_Internal_Shdr *symtab_hdr;
10447 Elf_Internal_Shdr *symtab_shndx_hdr;
10448 Elf_Internal_Shdr *symstrtab_hdr;
10449 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10450 struct elf_outext_info eoinfo;
10451 bfd_boolean merged;
10452 size_t relativecount = 0;
10453 asection *reldyn = 0;
10455 asection *attr_section = NULL;
10456 bfd_vma attr_size = 0;
10457 const char *std_attrs_section;
10459 if (! is_elf_hash_table (info->hash))
10463 abfd->flags |= DYNAMIC;
10465 dynamic = elf_hash_table (info)->dynamic_sections_created;
10466 dynobj = elf_hash_table (info)->dynobj;
10468 emit_relocs = (info->relocatable
10469 || info->emitrelocations);
10471 flinfo.info = info;
10472 flinfo.output_bfd = abfd;
10473 flinfo.symstrtab = _bfd_elf_stringtab_init ();
10474 if (flinfo.symstrtab == NULL)
10479 flinfo.dynsym_sec = NULL;
10480 flinfo.hash_sec = NULL;
10481 flinfo.symver_sec = NULL;
10485 flinfo.dynsym_sec = bfd_get_linker_section (dynobj, ".dynsym");
10486 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
10487 /* Note that dynsym_sec can be NULL (on VMS). */
10488 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
10489 /* Note that it is OK if symver_sec is NULL. */
10492 flinfo.contents = NULL;
10493 flinfo.external_relocs = NULL;
10494 flinfo.internal_relocs = NULL;
10495 flinfo.external_syms = NULL;
10496 flinfo.locsym_shndx = NULL;
10497 flinfo.internal_syms = NULL;
10498 flinfo.indices = NULL;
10499 flinfo.sections = NULL;
10500 flinfo.symbuf = NULL;
10501 flinfo.symshndxbuf = NULL;
10502 flinfo.symbuf_count = 0;
10503 flinfo.shndxbuf_size = 0;
10504 flinfo.filesym_count = 0;
10506 /* The object attributes have been merged. Remove the input
10507 sections from the link, and set the contents of the output
10509 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10510 for (o = abfd->sections; o != NULL; o = o->next)
10512 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10513 || strcmp (o->name, ".gnu.attributes") == 0)
10515 for (p = o->map_head.link_order; p != NULL; p = p->next)
10517 asection *input_section;
10519 if (p->type != bfd_indirect_link_order)
10521 input_section = p->u.indirect.section;
10522 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10523 elf_link_input_bfd ignores this section. */
10524 input_section->flags &= ~SEC_HAS_CONTENTS;
10527 attr_size = bfd_elf_obj_attr_size (abfd);
10530 bfd_set_section_size (abfd, o, attr_size);
10532 /* Skip this section later on. */
10533 o->map_head.link_order = NULL;
10536 o->flags |= SEC_EXCLUDE;
10540 /* Count up the number of relocations we will output for each output
10541 section, so that we know the sizes of the reloc sections. We
10542 also figure out some maximum sizes. */
10543 max_contents_size = 0;
10544 max_external_reloc_size = 0;
10545 max_internal_reloc_count = 0;
10547 max_sym_shndx_count = 0;
10549 for (o = abfd->sections; o != NULL; o = o->next)
10551 struct bfd_elf_section_data *esdo = elf_section_data (o);
10552 o->reloc_count = 0;
10554 for (p = o->map_head.link_order; p != NULL; p = p->next)
10556 unsigned int reloc_count = 0;
10557 struct bfd_elf_section_data *esdi = NULL;
10559 if (p->type == bfd_section_reloc_link_order
10560 || p->type == bfd_symbol_reloc_link_order)
10562 else if (p->type == bfd_indirect_link_order)
10566 sec = p->u.indirect.section;
10567 esdi = elf_section_data (sec);
10569 /* Mark all sections which are to be included in the
10570 link. This will normally be every section. We need
10571 to do this so that we can identify any sections which
10572 the linker has decided to not include. */
10573 sec->linker_mark = TRUE;
10575 if (sec->flags & SEC_MERGE)
10578 if (esdo->this_hdr.sh_type == SHT_REL
10579 || esdo->this_hdr.sh_type == SHT_RELA)
10580 /* Some backends use reloc_count in relocation sections
10581 to count particular types of relocs. Of course,
10582 reloc sections themselves can't have relocations. */
10584 else if (info->relocatable || info->emitrelocations)
10585 reloc_count = sec->reloc_count;
10586 else if (bed->elf_backend_count_relocs)
10587 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10589 if (sec->rawsize > max_contents_size)
10590 max_contents_size = sec->rawsize;
10591 if (sec->size > max_contents_size)
10592 max_contents_size = sec->size;
10594 /* We are interested in just local symbols, not all
10596 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10597 && (sec->owner->flags & DYNAMIC) == 0)
10601 if (elf_bad_symtab (sec->owner))
10602 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10603 / bed->s->sizeof_sym);
10605 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10607 if (sym_count > max_sym_count)
10608 max_sym_count = sym_count;
10610 if (sym_count > max_sym_shndx_count
10611 && elf_symtab_shndx (sec->owner) != 0)
10612 max_sym_shndx_count = sym_count;
10614 if ((sec->flags & SEC_RELOC) != 0)
10616 size_t ext_size = 0;
10618 if (esdi->rel.hdr != NULL)
10619 ext_size = esdi->rel.hdr->sh_size;
10620 if (esdi->rela.hdr != NULL)
10621 ext_size += esdi->rela.hdr->sh_size;
10623 if (ext_size > max_external_reloc_size)
10624 max_external_reloc_size = ext_size;
10625 if (sec->reloc_count > max_internal_reloc_count)
10626 max_internal_reloc_count = sec->reloc_count;
10631 if (reloc_count == 0)
10634 o->reloc_count += reloc_count;
10636 if (p->type == bfd_indirect_link_order
10637 && (info->relocatable || info->emitrelocations))
10640 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
10641 if (esdi->rela.hdr)
10642 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
10647 esdo->rela.count += reloc_count;
10649 esdo->rel.count += reloc_count;
10653 if (o->reloc_count > 0)
10654 o->flags |= SEC_RELOC;
10657 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10658 set it (this is probably a bug) and if it is set
10659 assign_section_numbers will create a reloc section. */
10660 o->flags &=~ SEC_RELOC;
10663 /* If the SEC_ALLOC flag is not set, force the section VMA to
10664 zero. This is done in elf_fake_sections as well, but forcing
10665 the VMA to 0 here will ensure that relocs against these
10666 sections are handled correctly. */
10667 if ((o->flags & SEC_ALLOC) == 0
10668 && ! o->user_set_vma)
10672 if (! info->relocatable && merged)
10673 elf_link_hash_traverse (elf_hash_table (info),
10674 _bfd_elf_link_sec_merge_syms, abfd);
10676 /* Figure out the file positions for everything but the symbol table
10677 and the relocs. We set symcount to force assign_section_numbers
10678 to create a symbol table. */
10679 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
10680 BFD_ASSERT (! abfd->output_has_begun);
10681 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10684 /* Set sizes, and assign file positions for reloc sections. */
10685 for (o = abfd->sections; o != NULL; o = o->next)
10687 struct bfd_elf_section_data *esdo = elf_section_data (o);
10688 if ((o->flags & SEC_RELOC) != 0)
10691 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
10695 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
10699 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10700 to count upwards while actually outputting the relocations. */
10701 esdo->rel.count = 0;
10702 esdo->rela.count = 0;
10705 _bfd_elf_assign_file_positions_for_relocs (abfd);
10707 /* We have now assigned file positions for all the sections except
10708 .symtab and .strtab. We start the .symtab section at the current
10709 file position, and write directly to it. We build the .strtab
10710 section in memory. */
10711 bfd_get_symcount (abfd) = 0;
10712 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10713 /* sh_name is set in prep_headers. */
10714 symtab_hdr->sh_type = SHT_SYMTAB;
10715 /* sh_flags, sh_addr and sh_size all start off zero. */
10716 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10717 /* sh_link is set in assign_section_numbers. */
10718 /* sh_info is set below. */
10719 /* sh_offset is set just below. */
10720 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10722 off = elf_next_file_pos (abfd);
10723 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10725 /* Note that at this point elf_next_file_pos (abfd) is
10726 incorrect. We do not yet know the size of the .symtab section.
10727 We correct next_file_pos below, after we do know the size. */
10729 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10730 continuously seeking to the right position in the file. */
10731 if (! info->keep_memory || max_sym_count < 20)
10732 flinfo.symbuf_size = 20;
10734 flinfo.symbuf_size = max_sym_count;
10735 amt = flinfo.symbuf_size;
10736 amt *= bed->s->sizeof_sym;
10737 flinfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10738 if (flinfo.symbuf == NULL)
10740 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10742 /* Wild guess at number of output symbols. realloc'd as needed. */
10743 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10744 flinfo.shndxbuf_size = amt;
10745 amt *= sizeof (Elf_External_Sym_Shndx);
10746 flinfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10747 if (flinfo.symshndxbuf == NULL)
10751 /* Start writing out the symbol table. The first symbol is always a
10753 if (info->strip != strip_all
10756 elfsym.st_value = 0;
10757 elfsym.st_size = 0;
10758 elfsym.st_info = 0;
10759 elfsym.st_other = 0;
10760 elfsym.st_shndx = SHN_UNDEF;
10761 elfsym.st_target_internal = 0;
10762 if (elf_link_output_sym (&flinfo, NULL, &elfsym, bfd_und_section_ptr,
10767 /* Output a symbol for each section. We output these even if we are
10768 discarding local symbols, since they are used for relocs. These
10769 symbols have no names. We store the index of each one in the
10770 index field of the section, so that we can find it again when
10771 outputting relocs. */
10772 if (info->strip != strip_all
10775 elfsym.st_size = 0;
10776 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10777 elfsym.st_other = 0;
10778 elfsym.st_value = 0;
10779 elfsym.st_target_internal = 0;
10780 for (i = 1; i < elf_numsections (abfd); i++)
10782 o = bfd_section_from_elf_index (abfd, i);
10785 o->target_index = bfd_get_symcount (abfd);
10786 elfsym.st_shndx = i;
10787 if (!info->relocatable)
10788 elfsym.st_value = o->vma;
10789 if (elf_link_output_sym (&flinfo, NULL, &elfsym, o, NULL) != 1)
10795 /* Allocate some memory to hold information read in from the input
10797 if (max_contents_size != 0)
10799 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10800 if (flinfo.contents == NULL)
10804 if (max_external_reloc_size != 0)
10806 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
10807 if (flinfo.external_relocs == NULL)
10811 if (max_internal_reloc_count != 0)
10813 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10814 amt *= sizeof (Elf_Internal_Rela);
10815 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10816 if (flinfo.internal_relocs == NULL)
10820 if (max_sym_count != 0)
10822 amt = max_sym_count * bed->s->sizeof_sym;
10823 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
10824 if (flinfo.external_syms == NULL)
10827 amt = max_sym_count * sizeof (Elf_Internal_Sym);
10828 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
10829 if (flinfo.internal_syms == NULL)
10832 amt = max_sym_count * sizeof (long);
10833 flinfo.indices = (long int *) bfd_malloc (amt);
10834 if (flinfo.indices == NULL)
10837 amt = max_sym_count * sizeof (asection *);
10838 flinfo.sections = (asection **) bfd_malloc (amt);
10839 if (flinfo.sections == NULL)
10843 if (max_sym_shndx_count != 0)
10845 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
10846 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
10847 if (flinfo.locsym_shndx == NULL)
10851 if (elf_hash_table (info)->tls_sec)
10853 bfd_vma base, end = 0;
10856 for (sec = elf_hash_table (info)->tls_sec;
10857 sec && (sec->flags & SEC_THREAD_LOCAL);
10860 bfd_size_type size = sec->size;
10863 && (sec->flags & SEC_HAS_CONTENTS) == 0)
10865 struct bfd_link_order *ord = sec->map_tail.link_order;
10868 size = ord->offset + ord->size;
10870 end = sec->vma + size;
10872 base = elf_hash_table (info)->tls_sec->vma;
10873 /* Only align end of TLS section if static TLS doesn't have special
10874 alignment requirements. */
10875 if (bed->static_tls_alignment == 1)
10876 end = align_power (end,
10877 elf_hash_table (info)->tls_sec->alignment_power);
10878 elf_hash_table (info)->tls_size = end - base;
10881 /* Reorder SHF_LINK_ORDER sections. */
10882 for (o = abfd->sections; o != NULL; o = o->next)
10884 if (!elf_fixup_link_order (abfd, o))
10888 /* Since ELF permits relocations to be against local symbols, we
10889 must have the local symbols available when we do the relocations.
10890 Since we would rather only read the local symbols once, and we
10891 would rather not keep them in memory, we handle all the
10892 relocations for a single input file at the same time.
10894 Unfortunately, there is no way to know the total number of local
10895 symbols until we have seen all of them, and the local symbol
10896 indices precede the global symbol indices. This means that when
10897 we are generating relocatable output, and we see a reloc against
10898 a global symbol, we can not know the symbol index until we have
10899 finished examining all the local symbols to see which ones we are
10900 going to output. To deal with this, we keep the relocations in
10901 memory, and don't output them until the end of the link. This is
10902 an unfortunate waste of memory, but I don't see a good way around
10903 it. Fortunately, it only happens when performing a relocatable
10904 link, which is not the common case. FIXME: If keep_memory is set
10905 we could write the relocs out and then read them again; I don't
10906 know how bad the memory loss will be. */
10908 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10909 sub->output_has_begun = FALSE;
10910 for (o = abfd->sections; o != NULL; o = o->next)
10912 for (p = o->map_head.link_order; p != NULL; p = p->next)
10914 if (p->type == bfd_indirect_link_order
10915 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
10916 == bfd_target_elf_flavour)
10917 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
10919 if (! sub->output_has_begun)
10921 if (! elf_link_input_bfd (&flinfo, sub))
10923 sub->output_has_begun = TRUE;
10926 else if (p->type == bfd_section_reloc_link_order
10927 || p->type == bfd_symbol_reloc_link_order)
10929 if (! elf_reloc_link_order (abfd, info, o, p))
10934 if (! _bfd_default_link_order (abfd, info, o, p))
10936 if (p->type == bfd_indirect_link_order
10937 && (bfd_get_flavour (sub)
10938 == bfd_target_elf_flavour)
10939 && (elf_elfheader (sub)->e_ident[EI_CLASS]
10940 != bed->s->elfclass))
10942 const char *iclass, *oclass;
10944 if (bed->s->elfclass == ELFCLASS64)
10946 iclass = "ELFCLASS32";
10947 oclass = "ELFCLASS64";
10951 iclass = "ELFCLASS64";
10952 oclass = "ELFCLASS32";
10955 bfd_set_error (bfd_error_wrong_format);
10956 (*_bfd_error_handler)
10957 (_("%B: file class %s incompatible with %s"),
10958 sub, iclass, oclass);
10967 /* Free symbol buffer if needed. */
10968 if (!info->reduce_memory_overheads)
10970 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10971 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10972 && elf_tdata (sub)->symbuf)
10974 free (elf_tdata (sub)->symbuf);
10975 elf_tdata (sub)->symbuf = NULL;
10979 /* Output a FILE symbol so that following locals are not associated
10980 with the wrong input file. */
10981 memset (&elfsym, 0, sizeof (elfsym));
10982 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
10983 elfsym.st_shndx = SHN_ABS;
10985 if (flinfo.filesym_count > 1
10986 && !elf_link_output_sym (&flinfo, NULL, &elfsym,
10987 bfd_und_section_ptr, NULL))
10990 /* Output any global symbols that got converted to local in a
10991 version script or due to symbol visibility. We do this in a
10992 separate step since ELF requires all local symbols to appear
10993 prior to any global symbols. FIXME: We should only do this if
10994 some global symbols were, in fact, converted to become local.
10995 FIXME: Will this work correctly with the Irix 5 linker? */
10996 eoinfo.failed = FALSE;
10997 eoinfo.flinfo = &flinfo;
10998 eoinfo.localsyms = TRUE;
10999 eoinfo.need_second_pass = FALSE;
11000 eoinfo.second_pass = FALSE;
11001 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11005 if (flinfo.filesym_count == 1
11006 && !elf_link_output_sym (&flinfo, NULL, &elfsym,
11007 bfd_und_section_ptr, NULL))
11010 if (eoinfo.need_second_pass)
11012 eoinfo.second_pass = TRUE;
11013 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11018 /* If backend needs to output some local symbols not present in the hash
11019 table, do it now. */
11020 if (bed->elf_backend_output_arch_local_syms)
11022 typedef int (*out_sym_func)
11023 (void *, const char *, Elf_Internal_Sym *, asection *,
11024 struct elf_link_hash_entry *);
11026 if (! ((*bed->elf_backend_output_arch_local_syms)
11027 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11031 /* That wrote out all the local symbols. Finish up the symbol table
11032 with the global symbols. Even if we want to strip everything we
11033 can, we still need to deal with those global symbols that got
11034 converted to local in a version script. */
11036 /* The sh_info field records the index of the first non local symbol. */
11037 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11040 && flinfo.dynsym_sec != NULL
11041 && flinfo.dynsym_sec->output_section != bfd_abs_section_ptr)
11043 Elf_Internal_Sym sym;
11044 bfd_byte *dynsym = flinfo.dynsym_sec->contents;
11045 long last_local = 0;
11047 /* Write out the section symbols for the output sections. */
11048 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
11054 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11056 sym.st_target_internal = 0;
11058 for (s = abfd->sections; s != NULL; s = s->next)
11064 dynindx = elf_section_data (s)->dynindx;
11067 indx = elf_section_data (s)->this_idx;
11068 BFD_ASSERT (indx > 0);
11069 sym.st_shndx = indx;
11070 if (! check_dynsym (abfd, &sym))
11072 sym.st_value = s->vma;
11073 dest = dynsym + dynindx * bed->s->sizeof_sym;
11074 if (last_local < dynindx)
11075 last_local = dynindx;
11076 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11080 /* Write out the local dynsyms. */
11081 if (elf_hash_table (info)->dynlocal)
11083 struct elf_link_local_dynamic_entry *e;
11084 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11089 /* Copy the internal symbol and turn off visibility.
11090 Note that we saved a word of storage and overwrote
11091 the original st_name with the dynstr_index. */
11093 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11095 s = bfd_section_from_elf_index (e->input_bfd,
11100 elf_section_data (s->output_section)->this_idx;
11101 if (! check_dynsym (abfd, &sym))
11103 sym.st_value = (s->output_section->vma
11105 + e->isym.st_value);
11108 if (last_local < e->dynindx)
11109 last_local = e->dynindx;
11111 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11112 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11116 elf_section_data (flinfo.dynsym_sec->output_section)->this_hdr.sh_info =
11120 /* We get the global symbols from the hash table. */
11121 eoinfo.failed = FALSE;
11122 eoinfo.localsyms = FALSE;
11123 eoinfo.flinfo = &flinfo;
11124 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11128 /* If backend needs to output some symbols not present in the hash
11129 table, do it now. */
11130 if (bed->elf_backend_output_arch_syms)
11132 typedef int (*out_sym_func)
11133 (void *, const char *, Elf_Internal_Sym *, asection *,
11134 struct elf_link_hash_entry *);
11136 if (! ((*bed->elf_backend_output_arch_syms)
11137 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11141 /* Flush all symbols to the file. */
11142 if (! elf_link_flush_output_syms (&flinfo, bed))
11145 /* Now we know the size of the symtab section. */
11146 off += symtab_hdr->sh_size;
11148 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
11149 if (symtab_shndx_hdr->sh_name != 0)
11151 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11152 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11153 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11154 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11155 symtab_shndx_hdr->sh_size = amt;
11157 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11160 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11161 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11166 /* Finish up and write out the symbol string table (.strtab)
11168 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11169 /* sh_name was set in prep_headers. */
11170 symstrtab_hdr->sh_type = SHT_STRTAB;
11171 symstrtab_hdr->sh_flags = 0;
11172 symstrtab_hdr->sh_addr = 0;
11173 symstrtab_hdr->sh_size = _bfd_stringtab_size (flinfo.symstrtab);
11174 symstrtab_hdr->sh_entsize = 0;
11175 symstrtab_hdr->sh_link = 0;
11176 symstrtab_hdr->sh_info = 0;
11177 /* sh_offset is set just below. */
11178 symstrtab_hdr->sh_addralign = 1;
11180 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
11181 elf_next_file_pos (abfd) = off;
11183 if (bfd_get_symcount (abfd) > 0)
11185 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11186 || ! _bfd_stringtab_emit (abfd, flinfo.symstrtab))
11190 /* Adjust the relocs to have the correct symbol indices. */
11191 for (o = abfd->sections; o != NULL; o = o->next)
11193 struct bfd_elf_section_data *esdo = elf_section_data (o);
11194 if ((o->flags & SEC_RELOC) == 0)
11197 if (esdo->rel.hdr != NULL)
11198 elf_link_adjust_relocs (abfd, &esdo->rel);
11199 if (esdo->rela.hdr != NULL)
11200 elf_link_adjust_relocs (abfd, &esdo->rela);
11202 /* Set the reloc_count field to 0 to prevent write_relocs from
11203 trying to swap the relocs out itself. */
11204 o->reloc_count = 0;
11207 if (dynamic && info->combreloc && dynobj != NULL)
11208 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11210 /* If we are linking against a dynamic object, or generating a
11211 shared library, finish up the dynamic linking information. */
11214 bfd_byte *dyncon, *dynconend;
11216 /* Fix up .dynamic entries. */
11217 o = bfd_get_linker_section (dynobj, ".dynamic");
11218 BFD_ASSERT (o != NULL);
11220 dyncon = o->contents;
11221 dynconend = o->contents + o->size;
11222 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11224 Elf_Internal_Dyn dyn;
11228 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11235 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11237 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11239 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11240 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11243 dyn.d_un.d_val = relativecount;
11250 name = info->init_function;
11253 name = info->fini_function;
11256 struct elf_link_hash_entry *h;
11258 h = elf_link_hash_lookup (elf_hash_table (info), name,
11259 FALSE, FALSE, TRUE);
11261 && (h->root.type == bfd_link_hash_defined
11262 || h->root.type == bfd_link_hash_defweak))
11264 dyn.d_un.d_ptr = h->root.u.def.value;
11265 o = h->root.u.def.section;
11266 if (o->output_section != NULL)
11267 dyn.d_un.d_ptr += (o->output_section->vma
11268 + o->output_offset);
11271 /* The symbol is imported from another shared
11272 library and does not apply to this one. */
11273 dyn.d_un.d_ptr = 0;
11280 case DT_PREINIT_ARRAYSZ:
11281 name = ".preinit_array";
11283 case DT_INIT_ARRAYSZ:
11284 name = ".init_array";
11286 case DT_FINI_ARRAYSZ:
11287 name = ".fini_array";
11289 o = bfd_get_section_by_name (abfd, name);
11292 (*_bfd_error_handler)
11293 (_("%B: could not find output section %s"), abfd, name);
11297 (*_bfd_error_handler)
11298 (_("warning: %s section has zero size"), name);
11299 dyn.d_un.d_val = o->size;
11302 case DT_PREINIT_ARRAY:
11303 name = ".preinit_array";
11305 case DT_INIT_ARRAY:
11306 name = ".init_array";
11308 case DT_FINI_ARRAY:
11309 name = ".fini_array";
11316 name = ".gnu.hash";
11325 name = ".gnu.version_d";
11328 name = ".gnu.version_r";
11331 name = ".gnu.version";
11333 o = bfd_get_section_by_name (abfd, name);
11336 (*_bfd_error_handler)
11337 (_("%B: could not find output section %s"), abfd, name);
11340 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11342 (*_bfd_error_handler)
11343 (_("warning: section '%s' is being made into a note"), name);
11344 bfd_set_error (bfd_error_nonrepresentable_section);
11347 dyn.d_un.d_ptr = o->vma;
11354 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11358 dyn.d_un.d_val = 0;
11359 dyn.d_un.d_ptr = 0;
11360 for (i = 1; i < elf_numsections (abfd); i++)
11362 Elf_Internal_Shdr *hdr;
11364 hdr = elf_elfsections (abfd)[i];
11365 if (hdr->sh_type == type
11366 && (hdr->sh_flags & SHF_ALLOC) != 0)
11368 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11369 dyn.d_un.d_val += hdr->sh_size;
11372 if (dyn.d_un.d_ptr == 0
11373 || hdr->sh_addr < dyn.d_un.d_ptr)
11374 dyn.d_un.d_ptr = hdr->sh_addr;
11380 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11384 /* If we have created any dynamic sections, then output them. */
11385 if (dynobj != NULL)
11387 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11390 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11391 if (((info->warn_shared_textrel && info->shared)
11392 || info->error_textrel)
11393 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11395 bfd_byte *dyncon, *dynconend;
11397 dyncon = o->contents;
11398 dynconend = o->contents + o->size;
11399 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11401 Elf_Internal_Dyn dyn;
11403 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11405 if (dyn.d_tag == DT_TEXTREL)
11407 if (info->error_textrel)
11408 info->callbacks->einfo
11409 (_("%P%X: read-only segment has dynamic relocations.\n"));
11411 info->callbacks->einfo
11412 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11418 for (o = dynobj->sections; o != NULL; o = o->next)
11420 if ((o->flags & SEC_HAS_CONTENTS) == 0
11422 || o->output_section == bfd_abs_section_ptr)
11424 if ((o->flags & SEC_LINKER_CREATED) == 0)
11426 /* At this point, we are only interested in sections
11427 created by _bfd_elf_link_create_dynamic_sections. */
11430 if (elf_hash_table (info)->stab_info.stabstr == o)
11432 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11434 if (strcmp (o->name, ".dynstr") != 0)
11436 /* FIXME: octets_per_byte. */
11437 if (! bfd_set_section_contents (abfd, o->output_section,
11439 (file_ptr) o->output_offset,
11445 /* The contents of the .dynstr section are actually in a
11447 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11448 if (bfd_seek (abfd, off, SEEK_SET) != 0
11449 || ! _bfd_elf_strtab_emit (abfd,
11450 elf_hash_table (info)->dynstr))
11456 if (info->relocatable)
11458 bfd_boolean failed = FALSE;
11460 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11465 /* If we have optimized stabs strings, output them. */
11466 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11468 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11472 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11475 elf_final_link_free (abfd, &flinfo);
11477 elf_linker (abfd) = TRUE;
11481 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11482 if (contents == NULL)
11483 return FALSE; /* Bail out and fail. */
11484 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11485 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11492 elf_final_link_free (abfd, &flinfo);
11496 /* Initialize COOKIE for input bfd ABFD. */
11499 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11500 struct bfd_link_info *info, bfd *abfd)
11502 Elf_Internal_Shdr *symtab_hdr;
11503 const struct elf_backend_data *bed;
11505 bed = get_elf_backend_data (abfd);
11506 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11508 cookie->abfd = abfd;
11509 cookie->sym_hashes = elf_sym_hashes (abfd);
11510 cookie->bad_symtab = elf_bad_symtab (abfd);
11511 if (cookie->bad_symtab)
11513 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11514 cookie->extsymoff = 0;
11518 cookie->locsymcount = symtab_hdr->sh_info;
11519 cookie->extsymoff = symtab_hdr->sh_info;
11522 if (bed->s->arch_size == 32)
11523 cookie->r_sym_shift = 8;
11525 cookie->r_sym_shift = 32;
11527 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11528 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11530 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11531 cookie->locsymcount, 0,
11533 if (cookie->locsyms == NULL)
11535 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11538 if (info->keep_memory)
11539 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11544 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11547 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11549 Elf_Internal_Shdr *symtab_hdr;
11551 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11552 if (cookie->locsyms != NULL
11553 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11554 free (cookie->locsyms);
11557 /* Initialize the relocation information in COOKIE for input section SEC
11558 of input bfd ABFD. */
11561 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11562 struct bfd_link_info *info, bfd *abfd,
11565 const struct elf_backend_data *bed;
11567 if (sec->reloc_count == 0)
11569 cookie->rels = NULL;
11570 cookie->relend = NULL;
11574 bed = get_elf_backend_data (abfd);
11576 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11577 info->keep_memory);
11578 if (cookie->rels == NULL)
11580 cookie->rel = cookie->rels;
11581 cookie->relend = (cookie->rels
11582 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11584 cookie->rel = cookie->rels;
11588 /* Free the memory allocated by init_reloc_cookie_rels,
11592 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11595 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11596 free (cookie->rels);
11599 /* Initialize the whole of COOKIE for input section SEC. */
11602 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11603 struct bfd_link_info *info,
11606 if (!init_reloc_cookie (cookie, info, sec->owner))
11608 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11613 fini_reloc_cookie (cookie, sec->owner);
11618 /* Free the memory allocated by init_reloc_cookie_for_section,
11622 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11625 fini_reloc_cookie_rels (cookie, sec);
11626 fini_reloc_cookie (cookie, sec->owner);
11629 /* Garbage collect unused sections. */
11631 /* Default gc_mark_hook. */
11634 _bfd_elf_gc_mark_hook (asection *sec,
11635 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11636 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11637 struct elf_link_hash_entry *h,
11638 Elf_Internal_Sym *sym)
11640 const char *sec_name;
11644 switch (h->root.type)
11646 case bfd_link_hash_defined:
11647 case bfd_link_hash_defweak:
11648 return h->root.u.def.section;
11650 case bfd_link_hash_common:
11651 return h->root.u.c.p->section;
11653 case bfd_link_hash_undefined:
11654 case bfd_link_hash_undefweak:
11655 /* To work around a glibc bug, keep all XXX input sections
11656 when there is an as yet undefined reference to __start_XXX
11657 or __stop_XXX symbols. The linker will later define such
11658 symbols for orphan input sections that have a name
11659 representable as a C identifier. */
11660 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11661 sec_name = h->root.root.string + 8;
11662 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11663 sec_name = h->root.root.string + 7;
11667 if (sec_name && *sec_name != '\0')
11671 for (i = info->input_bfds; i; i = i->link_next)
11673 sec = bfd_get_section_by_name (i, sec_name);
11675 sec->flags |= SEC_KEEP;
11685 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11690 /* COOKIE->rel describes a relocation against section SEC, which is
11691 a section we've decided to keep. Return the section that contains
11692 the relocation symbol, or NULL if no section contains it. */
11695 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11696 elf_gc_mark_hook_fn gc_mark_hook,
11697 struct elf_reloc_cookie *cookie)
11699 unsigned long r_symndx;
11700 struct elf_link_hash_entry *h;
11702 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11703 if (r_symndx == STN_UNDEF)
11706 if (r_symndx >= cookie->locsymcount
11707 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11709 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11710 while (h->root.type == bfd_link_hash_indirect
11711 || h->root.type == bfd_link_hash_warning)
11712 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11714 /* If this symbol is weak and there is a non-weak definition, we
11715 keep the non-weak definition because many backends put
11716 dynamic reloc info on the non-weak definition for code
11717 handling copy relocs. */
11718 if (h->u.weakdef != NULL)
11719 h->u.weakdef->mark = 1;
11720 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11723 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11724 &cookie->locsyms[r_symndx]);
11727 /* COOKIE->rel describes a relocation against section SEC, which is
11728 a section we've decided to keep. Mark the section that contains
11729 the relocation symbol. */
11732 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11734 elf_gc_mark_hook_fn gc_mark_hook,
11735 struct elf_reloc_cookie *cookie)
11739 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11740 if (rsec && !rsec->gc_mark)
11742 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
11743 || (rsec->owner->flags & DYNAMIC) != 0)
11745 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11751 /* The mark phase of garbage collection. For a given section, mark
11752 it and any sections in this section's group, and all the sections
11753 which define symbols to which it refers. */
11756 _bfd_elf_gc_mark (struct bfd_link_info *info,
11758 elf_gc_mark_hook_fn gc_mark_hook)
11761 asection *group_sec, *eh_frame;
11765 /* Mark all the sections in the group. */
11766 group_sec = elf_section_data (sec)->next_in_group;
11767 if (group_sec && !group_sec->gc_mark)
11768 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11771 /* Look through the section relocs. */
11773 eh_frame = elf_eh_frame_section (sec->owner);
11774 if ((sec->flags & SEC_RELOC) != 0
11775 && sec->reloc_count > 0
11776 && sec != eh_frame)
11778 struct elf_reloc_cookie cookie;
11780 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11784 for (; cookie.rel < cookie.relend; cookie.rel++)
11785 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11790 fini_reloc_cookie_for_section (&cookie, sec);
11794 if (ret && eh_frame && elf_fde_list (sec))
11796 struct elf_reloc_cookie cookie;
11798 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11802 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11803 gc_mark_hook, &cookie))
11805 fini_reloc_cookie_for_section (&cookie, eh_frame);
11812 /* Keep debug and special sections. */
11815 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
11816 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
11820 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
11823 bfd_boolean some_kept;
11825 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
11828 /* Ensure all linker created sections are kept, and see whether
11829 any other section is already marked. */
11831 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11833 if ((isec->flags & SEC_LINKER_CREATED) != 0)
11835 else if (isec->gc_mark)
11839 /* If no section in this file will be kept, then we can
11840 toss out debug sections. */
11844 /* Keep debug and special sections like .comment when they are
11845 not part of a group, or when we have single-member groups. */
11846 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11847 if ((elf_next_in_group (isec) == NULL
11848 || elf_next_in_group (isec) == isec)
11849 && ((isec->flags & SEC_DEBUGGING) != 0
11850 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0))
11856 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11858 struct elf_gc_sweep_symbol_info
11860 struct bfd_link_info *info;
11861 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
11866 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
11869 && (((h->root.type == bfd_link_hash_defined
11870 || h->root.type == bfd_link_hash_defweak)
11871 && !(h->def_regular
11872 && h->root.u.def.section->gc_mark))
11873 || h->root.type == bfd_link_hash_undefined
11874 || h->root.type == bfd_link_hash_undefweak))
11876 struct elf_gc_sweep_symbol_info *inf;
11878 inf = (struct elf_gc_sweep_symbol_info *) data;
11879 (*inf->hide_symbol) (inf->info, h, TRUE);
11880 h->def_regular = 0;
11881 h->ref_regular = 0;
11882 h->ref_regular_nonweak = 0;
11888 /* The sweep phase of garbage collection. Remove all garbage sections. */
11890 typedef bfd_boolean (*gc_sweep_hook_fn)
11891 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
11894 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
11897 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11898 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
11899 unsigned long section_sym_count;
11900 struct elf_gc_sweep_symbol_info sweep_info;
11902 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11906 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11909 for (o = sub->sections; o != NULL; o = o->next)
11911 /* When any section in a section group is kept, we keep all
11912 sections in the section group. If the first member of
11913 the section group is excluded, we will also exclude the
11915 if (o->flags & SEC_GROUP)
11917 asection *first = elf_next_in_group (o);
11918 o->gc_mark = first->gc_mark;
11924 /* Skip sweeping sections already excluded. */
11925 if (o->flags & SEC_EXCLUDE)
11928 /* Since this is early in the link process, it is simple
11929 to remove a section from the output. */
11930 o->flags |= SEC_EXCLUDE;
11932 if (info->print_gc_sections && o->size != 0)
11933 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
11935 /* But we also have to update some of the relocation
11936 info we collected before. */
11938 && (o->flags & SEC_RELOC) != 0
11939 && o->reloc_count > 0
11940 && !bfd_is_abs_section (o->output_section))
11942 Elf_Internal_Rela *internal_relocs;
11946 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
11947 info->keep_memory);
11948 if (internal_relocs == NULL)
11951 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
11953 if (elf_section_data (o)->relocs != internal_relocs)
11954 free (internal_relocs);
11962 /* Remove the symbols that were in the swept sections from the dynamic
11963 symbol table. GCFIXME: Anyone know how to get them out of the
11964 static symbol table as well? */
11965 sweep_info.info = info;
11966 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
11967 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
11970 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
11974 /* Propagate collected vtable information. This is called through
11975 elf_link_hash_traverse. */
11978 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
11980 /* Those that are not vtables. */
11981 if (h->vtable == NULL || h->vtable->parent == NULL)
11984 /* Those vtables that do not have parents, we cannot merge. */
11985 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
11988 /* If we've already been done, exit. */
11989 if (h->vtable->used && h->vtable->used[-1])
11992 /* Make sure the parent's table is up to date. */
11993 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
11995 if (h->vtable->used == NULL)
11997 /* None of this table's entries were referenced. Re-use the
11999 h->vtable->used = h->vtable->parent->vtable->used;
12000 h->vtable->size = h->vtable->parent->vtable->size;
12005 bfd_boolean *cu, *pu;
12007 /* Or the parent's entries into ours. */
12008 cu = h->vtable->used;
12010 pu = h->vtable->parent->vtable->used;
12013 const struct elf_backend_data *bed;
12014 unsigned int log_file_align;
12016 bed = get_elf_backend_data (h->root.u.def.section->owner);
12017 log_file_align = bed->s->log_file_align;
12018 n = h->vtable->parent->vtable->size >> log_file_align;
12033 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12036 bfd_vma hstart, hend;
12037 Elf_Internal_Rela *relstart, *relend, *rel;
12038 const struct elf_backend_data *bed;
12039 unsigned int log_file_align;
12041 /* Take care of both those symbols that do not describe vtables as
12042 well as those that are not loaded. */
12043 if (h->vtable == NULL || h->vtable->parent == NULL)
12046 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12047 || h->root.type == bfd_link_hash_defweak);
12049 sec = h->root.u.def.section;
12050 hstart = h->root.u.def.value;
12051 hend = hstart + h->size;
12053 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12055 return *(bfd_boolean *) okp = FALSE;
12056 bed = get_elf_backend_data (sec->owner);
12057 log_file_align = bed->s->log_file_align;
12059 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12061 for (rel = relstart; rel < relend; ++rel)
12062 if (rel->r_offset >= hstart && rel->r_offset < hend)
12064 /* If the entry is in use, do nothing. */
12065 if (h->vtable->used
12066 && (rel->r_offset - hstart) < h->vtable->size)
12068 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12069 if (h->vtable->used[entry])
12072 /* Otherwise, kill it. */
12073 rel->r_offset = rel->r_info = rel->r_addend = 0;
12079 /* Mark sections containing dynamically referenced symbols. When
12080 building shared libraries, we must assume that any visible symbol is
12084 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12086 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12088 if ((h->root.type == bfd_link_hash_defined
12089 || h->root.type == bfd_link_hash_defweak)
12091 || ((!info->executable || info->export_dynamic)
12093 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12094 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12095 && (strchr (h->root.root.string, ELF_VER_CHR) != NULL
12096 || !bfd_hide_sym_by_version (info->version_info,
12097 h->root.root.string)))))
12098 h->root.u.def.section->flags |= SEC_KEEP;
12103 /* Keep all sections containing symbols undefined on the command-line,
12104 and the section containing the entry symbol. */
12107 _bfd_elf_gc_keep (struct bfd_link_info *info)
12109 struct bfd_sym_chain *sym;
12111 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12113 struct elf_link_hash_entry *h;
12115 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12116 FALSE, FALSE, FALSE);
12119 && (h->root.type == bfd_link_hash_defined
12120 || h->root.type == bfd_link_hash_defweak)
12121 && !bfd_is_abs_section (h->root.u.def.section))
12122 h->root.u.def.section->flags |= SEC_KEEP;
12126 /* Do mark and sweep of unused sections. */
12129 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12131 bfd_boolean ok = TRUE;
12133 elf_gc_mark_hook_fn gc_mark_hook;
12134 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12136 if (!bed->can_gc_sections
12137 || !is_elf_hash_table (info->hash))
12139 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12143 bed->gc_keep (info);
12145 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12146 at the .eh_frame section if we can mark the FDEs individually. */
12147 _bfd_elf_begin_eh_frame_parsing (info);
12148 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
12151 struct elf_reloc_cookie cookie;
12153 sec = bfd_get_section_by_name (sub, ".eh_frame");
12154 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12156 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12157 if (elf_section_data (sec)->sec_info
12158 && (sec->flags & SEC_LINKER_CREATED) == 0)
12159 elf_eh_frame_section (sub) = sec;
12160 fini_reloc_cookie_for_section (&cookie, sec);
12161 sec = bfd_get_next_section_by_name (sec);
12164 _bfd_elf_end_eh_frame_parsing (info);
12166 /* Apply transitive closure to the vtable entry usage info. */
12167 elf_link_hash_traverse (elf_hash_table (info),
12168 elf_gc_propagate_vtable_entries_used,
12173 /* Kill the vtable relocations that were not used. */
12174 elf_link_hash_traverse (elf_hash_table (info),
12175 elf_gc_smash_unused_vtentry_relocs,
12180 /* Mark dynamically referenced symbols. */
12181 if (elf_hash_table (info)->dynamic_sections_created)
12182 elf_link_hash_traverse (elf_hash_table (info),
12183 bed->gc_mark_dynamic_ref,
12186 /* Grovel through relocs to find out who stays ... */
12187 gc_mark_hook = bed->gc_mark_hook;
12188 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
12192 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12195 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12196 Also treat note sections as a root, if the section is not part
12198 for (o = sub->sections; o != NULL; o = o->next)
12200 && (o->flags & SEC_EXCLUDE) == 0
12201 && ((o->flags & SEC_KEEP) != 0
12202 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12203 && elf_next_in_group (o) == NULL )))
12205 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12210 /* Allow the backend to mark additional target specific sections. */
12211 bed->gc_mark_extra_sections (info, gc_mark_hook);
12213 /* ... and mark SEC_EXCLUDE for those that go. */
12214 return elf_gc_sweep (abfd, info);
12217 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12220 bfd_elf_gc_record_vtinherit (bfd *abfd,
12222 struct elf_link_hash_entry *h,
12225 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12226 struct elf_link_hash_entry **search, *child;
12227 bfd_size_type extsymcount;
12228 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12230 /* The sh_info field of the symtab header tells us where the
12231 external symbols start. We don't care about the local symbols at
12233 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12234 if (!elf_bad_symtab (abfd))
12235 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12237 sym_hashes = elf_sym_hashes (abfd);
12238 sym_hashes_end = sym_hashes + extsymcount;
12240 /* Hunt down the child symbol, which is in this section at the same
12241 offset as the relocation. */
12242 for (search = sym_hashes; search != sym_hashes_end; ++search)
12244 if ((child = *search) != NULL
12245 && (child->root.type == bfd_link_hash_defined
12246 || child->root.type == bfd_link_hash_defweak)
12247 && child->root.u.def.section == sec
12248 && child->root.u.def.value == offset)
12252 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12253 abfd, sec, (unsigned long) offset);
12254 bfd_set_error (bfd_error_invalid_operation);
12258 if (!child->vtable)
12260 child->vtable = (struct elf_link_virtual_table_entry *)
12261 bfd_zalloc (abfd, sizeof (*child->vtable));
12262 if (!child->vtable)
12267 /* This *should* only be the absolute section. It could potentially
12268 be that someone has defined a non-global vtable though, which
12269 would be bad. It isn't worth paging in the local symbols to be
12270 sure though; that case should simply be handled by the assembler. */
12272 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12275 child->vtable->parent = h;
12280 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12283 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12284 asection *sec ATTRIBUTE_UNUSED,
12285 struct elf_link_hash_entry *h,
12288 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12289 unsigned int log_file_align = bed->s->log_file_align;
12293 h->vtable = (struct elf_link_virtual_table_entry *)
12294 bfd_zalloc (abfd, sizeof (*h->vtable));
12299 if (addend >= h->vtable->size)
12301 size_t size, bytes, file_align;
12302 bfd_boolean *ptr = h->vtable->used;
12304 /* While the symbol is undefined, we have to be prepared to handle
12306 file_align = 1 << log_file_align;
12307 if (h->root.type == bfd_link_hash_undefined)
12308 size = addend + file_align;
12312 if (addend >= size)
12314 /* Oops! We've got a reference past the defined end of
12315 the table. This is probably a bug -- shall we warn? */
12316 size = addend + file_align;
12319 size = (size + file_align - 1) & -file_align;
12321 /* Allocate one extra entry for use as a "done" flag for the
12322 consolidation pass. */
12323 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12327 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12333 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12334 * sizeof (bfd_boolean));
12335 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12339 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12344 /* And arrange for that done flag to be at index -1. */
12345 h->vtable->used = ptr + 1;
12346 h->vtable->size = size;
12349 h->vtable->used[addend >> log_file_align] = TRUE;
12354 /* Map an ELF section header flag to its corresponding string. */
12358 flagword flag_value;
12359 } elf_flags_to_name_table;
12361 static elf_flags_to_name_table elf_flags_to_names [] =
12363 { "SHF_WRITE", SHF_WRITE },
12364 { "SHF_ALLOC", SHF_ALLOC },
12365 { "SHF_EXECINSTR", SHF_EXECINSTR },
12366 { "SHF_MERGE", SHF_MERGE },
12367 { "SHF_STRINGS", SHF_STRINGS },
12368 { "SHF_INFO_LINK", SHF_INFO_LINK},
12369 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
12370 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
12371 { "SHF_GROUP", SHF_GROUP },
12372 { "SHF_TLS", SHF_TLS },
12373 { "SHF_MASKOS", SHF_MASKOS },
12374 { "SHF_EXCLUDE", SHF_EXCLUDE },
12377 /* Returns TRUE if the section is to be included, otherwise FALSE. */
12379 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
12380 struct flag_info *flaginfo,
12383 const bfd_vma sh_flags = elf_section_flags (section);
12385 if (!flaginfo->flags_initialized)
12387 bfd *obfd = info->output_bfd;
12388 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12389 struct flag_info_list *tf = flaginfo->flag_list;
12391 int without_hex = 0;
12393 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
12396 flagword (*lookup) (char *);
12398 lookup = bed->elf_backend_lookup_section_flags_hook;
12399 if (lookup != NULL)
12401 flagword hexval = (*lookup) ((char *) tf->name);
12405 if (tf->with == with_flags)
12406 with_hex |= hexval;
12407 else if (tf->with == without_flags)
12408 without_hex |= hexval;
12413 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
12415 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
12417 if (tf->with == with_flags)
12418 with_hex |= elf_flags_to_names[i].flag_value;
12419 else if (tf->with == without_flags)
12420 without_hex |= elf_flags_to_names[i].flag_value;
12427 info->callbacks->einfo
12428 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
12432 flaginfo->flags_initialized = TRUE;
12433 flaginfo->only_with_flags |= with_hex;
12434 flaginfo->not_with_flags |= without_hex;
12437 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
12440 if ((flaginfo->not_with_flags & sh_flags) != 0)
12446 struct alloc_got_off_arg {
12448 struct bfd_link_info *info;
12451 /* We need a special top-level link routine to convert got reference counts
12452 to real got offsets. */
12455 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12457 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12458 bfd *obfd = gofarg->info->output_bfd;
12459 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12461 if (h->got.refcount > 0)
12463 h->got.offset = gofarg->gotoff;
12464 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12467 h->got.offset = (bfd_vma) -1;
12472 /* And an accompanying bit to work out final got entry offsets once
12473 we're done. Should be called from final_link. */
12476 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12477 struct bfd_link_info *info)
12480 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12482 struct alloc_got_off_arg gofarg;
12484 BFD_ASSERT (abfd == info->output_bfd);
12486 if (! is_elf_hash_table (info->hash))
12489 /* The GOT offset is relative to the .got section, but the GOT header is
12490 put into the .got.plt section, if the backend uses it. */
12491 if (bed->want_got_plt)
12494 gotoff = bed->got_header_size;
12496 /* Do the local .got entries first. */
12497 for (i = info->input_bfds; i; i = i->link_next)
12499 bfd_signed_vma *local_got;
12500 bfd_size_type j, locsymcount;
12501 Elf_Internal_Shdr *symtab_hdr;
12503 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12506 local_got = elf_local_got_refcounts (i);
12510 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12511 if (elf_bad_symtab (i))
12512 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12514 locsymcount = symtab_hdr->sh_info;
12516 for (j = 0; j < locsymcount; ++j)
12518 if (local_got[j] > 0)
12520 local_got[j] = gotoff;
12521 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12524 local_got[j] = (bfd_vma) -1;
12528 /* Then the global .got entries. .plt refcounts are handled by
12529 adjust_dynamic_symbol */
12530 gofarg.gotoff = gotoff;
12531 gofarg.info = info;
12532 elf_link_hash_traverse (elf_hash_table (info),
12533 elf_gc_allocate_got_offsets,
12538 /* Many folk need no more in the way of final link than this, once
12539 got entry reference counting is enabled. */
12542 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12544 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12547 /* Invoke the regular ELF backend linker to do all the work. */
12548 return bfd_elf_final_link (abfd, info);
12552 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12554 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12556 if (rcookie->bad_symtab)
12557 rcookie->rel = rcookie->rels;
12559 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12561 unsigned long r_symndx;
12563 if (! rcookie->bad_symtab)
12564 if (rcookie->rel->r_offset > offset)
12566 if (rcookie->rel->r_offset != offset)
12569 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12570 if (r_symndx == STN_UNDEF)
12573 if (r_symndx >= rcookie->locsymcount
12574 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12576 struct elf_link_hash_entry *h;
12578 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12580 while (h->root.type == bfd_link_hash_indirect
12581 || h->root.type == bfd_link_hash_warning)
12582 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12584 if ((h->root.type == bfd_link_hash_defined
12585 || h->root.type == bfd_link_hash_defweak)
12586 && discarded_section (h->root.u.def.section))
12593 /* It's not a relocation against a global symbol,
12594 but it could be a relocation against a local
12595 symbol for a discarded section. */
12597 Elf_Internal_Sym *isym;
12599 /* Need to: get the symbol; get the section. */
12600 isym = &rcookie->locsyms[r_symndx];
12601 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12602 if (isec != NULL && discarded_section (isec))
12610 /* Discard unneeded references to discarded sections.
12611 Returns TRUE if any section's size was changed. */
12612 /* This function assumes that the relocations are in sorted order,
12613 which is true for all known assemblers. */
12616 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12618 struct elf_reloc_cookie cookie;
12619 asection *stab, *eh;
12620 const struct elf_backend_data *bed;
12622 bfd_boolean ret = FALSE;
12624 if (info->traditional_format
12625 || !is_elf_hash_table (info->hash))
12628 _bfd_elf_begin_eh_frame_parsing (info);
12629 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
12631 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12634 bed = get_elf_backend_data (abfd);
12637 if (!info->relocatable)
12639 eh = bfd_get_section_by_name (abfd, ".eh_frame");
12642 || bfd_is_abs_section (eh->output_section)))
12643 eh = bfd_get_next_section_by_name (eh);
12646 stab = bfd_get_section_by_name (abfd, ".stab");
12648 && (stab->size == 0
12649 || bfd_is_abs_section (stab->output_section)
12650 || stab->sec_info_type != SEC_INFO_TYPE_STABS))
12655 && bed->elf_backend_discard_info == NULL)
12658 if (!init_reloc_cookie (&cookie, info, abfd))
12662 && stab->reloc_count > 0
12663 && init_reloc_cookie_rels (&cookie, info, abfd, stab))
12665 if (_bfd_discard_section_stabs (abfd, stab,
12666 elf_section_data (stab)->sec_info,
12667 bfd_elf_reloc_symbol_deleted_p,
12670 fini_reloc_cookie_rels (&cookie, stab);
12674 && init_reloc_cookie_rels (&cookie, info, abfd, eh))
12676 _bfd_elf_parse_eh_frame (abfd, info, eh, &cookie);
12677 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
12678 bfd_elf_reloc_symbol_deleted_p,
12681 fini_reloc_cookie_rels (&cookie, eh);
12682 eh = bfd_get_next_section_by_name (eh);
12685 if (bed->elf_backend_discard_info != NULL
12686 && (*bed->elf_backend_discard_info) (abfd, &cookie, info))
12689 fini_reloc_cookie (&cookie, abfd);
12691 _bfd_elf_end_eh_frame_parsing (info);
12693 if (info->eh_frame_hdr
12694 && !info->relocatable
12695 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12702 _bfd_elf_section_already_linked (bfd *abfd,
12704 struct bfd_link_info *info)
12707 const char *name, *key;
12708 struct bfd_section_already_linked *l;
12709 struct bfd_section_already_linked_hash_entry *already_linked_list;
12711 if (sec->output_section == bfd_abs_section_ptr)
12714 flags = sec->flags;
12716 /* Return if it isn't a linkonce section. A comdat group section
12717 also has SEC_LINK_ONCE set. */
12718 if ((flags & SEC_LINK_ONCE) == 0)
12721 /* Don't put group member sections on our list of already linked
12722 sections. They are handled as a group via their group section. */
12723 if (elf_sec_group (sec) != NULL)
12726 /* For a SHT_GROUP section, use the group signature as the key. */
12728 if ((flags & SEC_GROUP) != 0
12729 && elf_next_in_group (sec) != NULL
12730 && elf_group_name (elf_next_in_group (sec)) != NULL)
12731 key = elf_group_name (elf_next_in_group (sec));
12734 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
12735 if (CONST_STRNEQ (name, ".gnu.linkonce.")
12736 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
12739 /* Must be a user linkonce section that doesn't follow gcc's
12740 naming convention. In this case we won't be matching
12741 single member groups. */
12745 already_linked_list = bfd_section_already_linked_table_lookup (key);
12747 for (l = already_linked_list->entry; l != NULL; l = l->next)
12749 /* We may have 2 different types of sections on the list: group
12750 sections with a signature of <key> (<key> is some string),
12751 and linkonce sections named .gnu.linkonce.<type>.<key>.
12752 Match like sections. LTO plugin sections are an exception.
12753 They are always named .gnu.linkonce.t.<key> and match either
12754 type of section. */
12755 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
12756 && ((flags & SEC_GROUP) != 0
12757 || strcmp (name, l->sec->name) == 0))
12758 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
12760 /* The section has already been linked. See if we should
12761 issue a warning. */
12762 if (!_bfd_handle_already_linked (sec, l, info))
12765 if (flags & SEC_GROUP)
12767 asection *first = elf_next_in_group (sec);
12768 asection *s = first;
12772 s->output_section = bfd_abs_section_ptr;
12773 /* Record which group discards it. */
12774 s->kept_section = l->sec;
12775 s = elf_next_in_group (s);
12776 /* These lists are circular. */
12786 /* A single member comdat group section may be discarded by a
12787 linkonce section and vice versa. */
12788 if ((flags & SEC_GROUP) != 0)
12790 asection *first = elf_next_in_group (sec);
12792 if (first != NULL && elf_next_in_group (first) == first)
12793 /* Check this single member group against linkonce sections. */
12794 for (l = already_linked_list->entry; l != NULL; l = l->next)
12795 if ((l->sec->flags & SEC_GROUP) == 0
12796 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
12798 first->output_section = bfd_abs_section_ptr;
12799 first->kept_section = l->sec;
12800 sec->output_section = bfd_abs_section_ptr;
12805 /* Check this linkonce section against single member groups. */
12806 for (l = already_linked_list->entry; l != NULL; l = l->next)
12807 if (l->sec->flags & SEC_GROUP)
12809 asection *first = elf_next_in_group (l->sec);
12812 && elf_next_in_group (first) == first
12813 && bfd_elf_match_symbols_in_sections (first, sec, info))
12815 sec->output_section = bfd_abs_section_ptr;
12816 sec->kept_section = first;
12821 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12822 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12823 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12824 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12825 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12826 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12827 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12828 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12829 The reverse order cannot happen as there is never a bfd with only the
12830 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12831 matter as here were are looking only for cross-bfd sections. */
12833 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
12834 for (l = already_linked_list->entry; l != NULL; l = l->next)
12835 if ((l->sec->flags & SEC_GROUP) == 0
12836 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
12838 if (abfd != l->sec->owner)
12839 sec->output_section = bfd_abs_section_ptr;
12843 /* This is the first section with this name. Record it. */
12844 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
12845 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
12846 return sec->output_section == bfd_abs_section_ptr;
12850 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
12852 return sym->st_shndx == SHN_COMMON;
12856 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
12862 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
12864 return bfd_com_section_ptr;
12868 _bfd_elf_default_got_elt_size (bfd *abfd,
12869 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12870 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
12871 bfd *ibfd ATTRIBUTE_UNUSED,
12872 unsigned long symndx ATTRIBUTE_UNUSED)
12874 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12875 return bed->s->arch_size / 8;
12878 /* Routines to support the creation of dynamic relocs. */
12880 /* Returns the name of the dynamic reloc section associated with SEC. */
12882 static const char *
12883 get_dynamic_reloc_section_name (bfd * abfd,
12885 bfd_boolean is_rela)
12888 const char *old_name = bfd_get_section_name (NULL, sec);
12889 const char *prefix = is_rela ? ".rela" : ".rel";
12891 if (old_name == NULL)
12894 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
12895 sprintf (name, "%s%s", prefix, old_name);
12900 /* Returns the dynamic reloc section associated with SEC.
12901 If necessary compute the name of the dynamic reloc section based
12902 on SEC's name (looked up in ABFD's string table) and the setting
12906 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
12908 bfd_boolean is_rela)
12910 asection * reloc_sec = elf_section_data (sec)->sreloc;
12912 if (reloc_sec == NULL)
12914 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12918 reloc_sec = bfd_get_linker_section (abfd, name);
12920 if (reloc_sec != NULL)
12921 elf_section_data (sec)->sreloc = reloc_sec;
12928 /* Returns the dynamic reloc section associated with SEC. If the
12929 section does not exist it is created and attached to the DYNOBJ
12930 bfd and stored in the SRELOC field of SEC's elf_section_data
12933 ALIGNMENT is the alignment for the newly created section and
12934 IS_RELA defines whether the name should be .rela.<SEC's name>
12935 or .rel.<SEC's name>. The section name is looked up in the
12936 string table associated with ABFD. */
12939 _bfd_elf_make_dynamic_reloc_section (asection * sec,
12941 unsigned int alignment,
12943 bfd_boolean is_rela)
12945 asection * reloc_sec = elf_section_data (sec)->sreloc;
12947 if (reloc_sec == NULL)
12949 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12954 reloc_sec = bfd_get_linker_section (dynobj, name);
12956 if (reloc_sec == NULL)
12958 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
12959 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
12960 if ((sec->flags & SEC_ALLOC) != 0)
12961 flags |= SEC_ALLOC | SEC_LOAD;
12963 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
12964 if (reloc_sec != NULL)
12966 /* _bfd_elf_get_sec_type_attr chooses a section type by
12967 name. Override as it may be wrong, eg. for a user
12968 section named "auto" we'll get ".relauto" which is
12969 seen to be a .rela section. */
12970 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
12971 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
12976 elf_section_data (sec)->sreloc = reloc_sec;
12982 /* Copy the ELF symbol type associated with a linker hash entry. */
12984 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd ATTRIBUTE_UNUSED,
12985 struct bfd_link_hash_entry * hdest,
12986 struct bfd_link_hash_entry * hsrc)
12988 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *)hdest;
12989 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *)hsrc;
12991 ehdest->type = ehsrc->type;
12992 ehdest->target_internal = ehsrc->target_internal;
12995 /* Append a RELA relocation REL to section S in BFD. */
12998 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13000 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13001 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13002 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13003 bed->s->swap_reloca_out (abfd, rel, loc);
13006 /* Append a REL relocation REL to section S in BFD. */
13009 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13011 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13012 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13013 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13014 bed->s->swap_reloc_out (abfd, rel, loc);