2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* ELF linker code. */
23 /* This struct is used to pass information to routines called via
24 elf_link_hash_traverse which must return failure. */
26 struct elf_info_failed
29 struct bfd_link_info *info;
30 struct bfd_elf_version_tree *verdefs;
33 static boolean is_global_data_symbol_definition
34 PARAMS ((bfd *, Elf_Internal_Sym *));
35 static boolean elf_link_is_defined_archive_symbol
36 PARAMS ((bfd *, carsym *));
37 static boolean elf_link_add_object_symbols
38 PARAMS ((bfd *, struct bfd_link_info *));
39 static boolean elf_link_add_archive_symbols
40 PARAMS ((bfd *, struct bfd_link_info *));
41 static boolean elf_merge_symbol
42 PARAMS ((bfd *, struct bfd_link_info *, const char *,
43 Elf_Internal_Sym *, asection **, bfd_vma *,
44 struct elf_link_hash_entry **, boolean *, boolean *,
46 static boolean elf_add_default_symbol
47 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
48 const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
49 boolean *, boolean, boolean));
50 static boolean elf_export_symbol
51 PARAMS ((struct elf_link_hash_entry *, PTR));
52 static boolean elf_finalize_dynstr
53 PARAMS ((bfd *, struct bfd_link_info *));
54 static boolean elf_fix_symbol_flags
55 PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *));
56 static boolean elf_adjust_dynamic_symbol
57 PARAMS ((struct elf_link_hash_entry *, PTR));
58 static boolean elf_link_find_version_dependencies
59 PARAMS ((struct elf_link_hash_entry *, PTR));
60 static boolean elf_link_assign_sym_version
61 PARAMS ((struct elf_link_hash_entry *, PTR));
62 static boolean elf_collect_hash_codes
63 PARAMS ((struct elf_link_hash_entry *, PTR));
64 static boolean elf_link_read_relocs_from_section
65 PARAMS ((bfd *, Elf_Internal_Shdr *, PTR, Elf_Internal_Rela *));
66 static size_t compute_bucket_count
67 PARAMS ((struct bfd_link_info *));
68 static boolean elf_link_output_relocs
69 PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *));
70 static boolean elf_link_size_reloc_section
71 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
72 static void elf_link_adjust_relocs
73 PARAMS ((bfd *, Elf_Internal_Shdr *, unsigned int,
74 struct elf_link_hash_entry **));
75 static int elf_link_sort_cmp1
76 PARAMS ((const void *, const void *));
77 static int elf_link_sort_cmp2
78 PARAMS ((const void *, const void *));
79 static size_t elf_link_sort_relocs
80 PARAMS ((bfd *, struct bfd_link_info *, asection **));
81 static boolean elf_section_ignore_discarded_relocs
82 PARAMS ((asection *));
84 /* Given an ELF BFD, add symbols to the global hash table as
88 elf_bfd_link_add_symbols (abfd, info)
90 struct bfd_link_info *info;
92 switch (bfd_get_format (abfd))
95 return elf_link_add_object_symbols (abfd, info);
97 return elf_link_add_archive_symbols (abfd, info);
99 bfd_set_error (bfd_error_wrong_format);
104 /* Return true iff this is a non-common, definition of a non-function symbol. */
106 is_global_data_symbol_definition (abfd, sym)
107 bfd * abfd ATTRIBUTE_UNUSED;
108 Elf_Internal_Sym * sym;
110 /* Local symbols do not count, but target specific ones might. */
111 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
112 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
115 /* Function symbols do not count. */
116 if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
119 /* If the section is undefined, then so is the symbol. */
120 if (sym->st_shndx == SHN_UNDEF)
123 /* If the symbol is defined in the common section, then
124 it is a common definition and so does not count. */
125 if (sym->st_shndx == SHN_COMMON)
128 /* If the symbol is in a target specific section then we
129 must rely upon the backend to tell us what it is. */
130 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
131 /* FIXME - this function is not coded yet:
133 return _bfd_is_global_symbol_definition (abfd, sym);
135 Instead for now assume that the definition is not global,
136 Even if this is wrong, at least the linker will behave
137 in the same way that it used to do. */
143 /* Search the symbol table of the archive element of the archive ABFD
144 whose archive map contains a mention of SYMDEF, and determine if
145 the symbol is defined in this element. */
147 elf_link_is_defined_archive_symbol (abfd, symdef)
151 Elf_Internal_Shdr * hdr;
152 bfd_size_type symcount;
153 bfd_size_type extsymcount;
154 bfd_size_type extsymoff;
155 Elf_Internal_Sym *isymbuf;
156 Elf_Internal_Sym *isym;
157 Elf_Internal_Sym *isymend;
160 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
161 if (abfd == (bfd *) NULL)
164 if (! bfd_check_format (abfd, bfd_object))
167 /* If we have already included the element containing this symbol in the
168 link then we do not need to include it again. Just claim that any symbol
169 it contains is not a definition, so that our caller will not decide to
170 (re)include this element. */
171 if (abfd->archive_pass)
174 /* Select the appropriate symbol table. */
175 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
176 hdr = &elf_tdata (abfd)->symtab_hdr;
178 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
180 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
182 /* The sh_info field of the symtab header tells us where the
183 external symbols start. We don't care about the local symbols. */
184 if (elf_bad_symtab (abfd))
186 extsymcount = symcount;
191 extsymcount = symcount - hdr->sh_info;
192 extsymoff = hdr->sh_info;
195 if (extsymcount == 0)
198 /* Read in the symbol table. */
199 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
204 /* Scan the symbol table looking for SYMDEF. */
206 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
210 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
212 if (name == (const char *) NULL)
215 if (strcmp (name, symdef->name) == 0)
217 result = is_global_data_symbol_definition (abfd, isym);
227 /* Add symbols from an ELF archive file to the linker hash table. We
228 don't use _bfd_generic_link_add_archive_symbols because of a
229 problem which arises on UnixWare. The UnixWare libc.so is an
230 archive which includes an entry libc.so.1 which defines a bunch of
231 symbols. The libc.so archive also includes a number of other
232 object files, which also define symbols, some of which are the same
233 as those defined in libc.so.1. Correct linking requires that we
234 consider each object file in turn, and include it if it defines any
235 symbols we need. _bfd_generic_link_add_archive_symbols does not do
236 this; it looks through the list of undefined symbols, and includes
237 any object file which defines them. When this algorithm is used on
238 UnixWare, it winds up pulling in libc.so.1 early and defining a
239 bunch of symbols. This means that some of the other objects in the
240 archive are not included in the link, which is incorrect since they
241 precede libc.so.1 in the archive.
243 Fortunately, ELF archive handling is simpler than that done by
244 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
245 oddities. In ELF, if we find a symbol in the archive map, and the
246 symbol is currently undefined, we know that we must pull in that
249 Unfortunately, we do have to make multiple passes over the symbol
250 table until nothing further is resolved. */
253 elf_link_add_archive_symbols (abfd, info)
255 struct bfd_link_info *info;
258 boolean *defined = NULL;
259 boolean *included = NULL;
264 if (! bfd_has_map (abfd))
266 /* An empty archive is a special case. */
267 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
269 bfd_set_error (bfd_error_no_armap);
273 /* Keep track of all symbols we know to be already defined, and all
274 files we know to be already included. This is to speed up the
275 second and subsequent passes. */
276 c = bfd_ardata (abfd)->symdef_count;
280 amt *= sizeof (boolean);
281 defined = (boolean *) bfd_zmalloc (amt);
282 included = (boolean *) bfd_zmalloc (amt);
283 if (defined == (boolean *) NULL || included == (boolean *) NULL)
286 symdefs = bfd_ardata (abfd)->symdefs;
299 symdefend = symdef + c;
300 for (i = 0; symdef < symdefend; symdef++, i++)
302 struct elf_link_hash_entry *h;
304 struct bfd_link_hash_entry *undefs_tail;
307 if (defined[i] || included[i])
309 if (symdef->file_offset == last)
315 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
316 false, false, false);
323 /* If this is a default version (the name contains @@),
324 look up the symbol again with only one `@' as well
325 as without the version. The effect is that references
326 to the symbol with and without the version will be
327 matched by the default symbol in the archive. */
329 p = strchr (symdef->name, ELF_VER_CHR);
330 if (p == NULL || p[1] != ELF_VER_CHR)
333 /* First check with only one `@'. */
334 len = strlen (symdef->name);
335 copy = bfd_alloc (abfd, (bfd_size_type) len);
338 first = p - symdef->name + 1;
339 memcpy (copy, symdef->name, first);
340 memcpy (copy + first, symdef->name + first + 1, len - first);
342 h = elf_link_hash_lookup (elf_hash_table (info), copy,
343 false, false, false);
347 /* We also need to check references to the symbol
348 without the version. */
350 copy[first - 1] = '\0';
351 h = elf_link_hash_lookup (elf_hash_table (info),
352 copy, false, false, false);
355 bfd_release (abfd, copy);
361 if (h->root.type == bfd_link_hash_common)
363 /* We currently have a common symbol. The archive map contains
364 a reference to this symbol, so we may want to include it. We
365 only want to include it however, if this archive element
366 contains a definition of the symbol, not just another common
369 Unfortunately some archivers (including GNU ar) will put
370 declarations of common symbols into their archive maps, as
371 well as real definitions, so we cannot just go by the archive
372 map alone. Instead we must read in the element's symbol
373 table and check that to see what kind of symbol definition
375 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
378 else if (h->root.type != bfd_link_hash_undefined)
380 if (h->root.type != bfd_link_hash_undefweak)
385 /* We need to include this archive member. */
386 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
387 if (element == (bfd *) NULL)
390 if (! bfd_check_format (element, bfd_object))
393 /* Doublecheck that we have not included this object
394 already--it should be impossible, but there may be
395 something wrong with the archive. */
396 if (element->archive_pass != 0)
398 bfd_set_error (bfd_error_bad_value);
401 element->archive_pass = 1;
403 undefs_tail = info->hash->undefs_tail;
405 if (! (*info->callbacks->add_archive_element) (info, element,
408 if (! elf_link_add_object_symbols (element, info))
411 /* If there are any new undefined symbols, we need to make
412 another pass through the archive in order to see whether
413 they can be defined. FIXME: This isn't perfect, because
414 common symbols wind up on undefs_tail and because an
415 undefined symbol which is defined later on in this pass
416 does not require another pass. This isn't a bug, but it
417 does make the code less efficient than it could be. */
418 if (undefs_tail != info->hash->undefs_tail)
421 /* Look backward to mark all symbols from this object file
422 which we have already seen in this pass. */
426 included[mark] = true;
431 while (symdefs[mark].file_offset == symdef->file_offset);
433 /* We mark subsequent symbols from this object file as we go
434 on through the loop. */
435 last = symdef->file_offset;
446 if (defined != (boolean *) NULL)
448 if (included != (boolean *) NULL)
453 /* This function is called when we want to define a new symbol. It
454 handles the various cases which arise when we find a definition in
455 a dynamic object, or when there is already a definition in a
456 dynamic object. The new symbol is described by NAME, SYM, PSEC,
457 and PVALUE. We set SYM_HASH to the hash table entry. We set
458 OVERRIDE if the old symbol is overriding a new definition. We set
459 TYPE_CHANGE_OK if it is OK for the type to change. We set
460 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
461 change, we mean that we shouldn't warn if the type or size does
462 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
466 elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash,
467 override, type_change_ok, size_change_ok, dt_needed)
469 struct bfd_link_info *info;
471 Elf_Internal_Sym *sym;
474 struct elf_link_hash_entry **sym_hash;
476 boolean *type_change_ok;
477 boolean *size_change_ok;
481 struct elf_link_hash_entry *h;
484 boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
489 bind = ELF_ST_BIND (sym->st_info);
491 if (! bfd_is_und_section (sec))
492 h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false);
494 h = ((struct elf_link_hash_entry *)
495 bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false));
500 /* This code is for coping with dynamic objects, and is only useful
501 if we are doing an ELF link. */
502 if (info->hash->creator != abfd->xvec)
505 /* For merging, we only care about real symbols. */
507 while (h->root.type == bfd_link_hash_indirect
508 || h->root.type == bfd_link_hash_warning)
509 h = (struct elf_link_hash_entry *) h->root.u.i.link;
511 /* If we just created the symbol, mark it as being an ELF symbol.
512 Other than that, there is nothing to do--there is no merge issue
513 with a newly defined symbol--so we just return. */
515 if (h->root.type == bfd_link_hash_new)
517 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
521 /* OLDBFD is a BFD associated with the existing symbol. */
523 switch (h->root.type)
529 case bfd_link_hash_undefined:
530 case bfd_link_hash_undefweak:
531 oldbfd = h->root.u.undef.abfd;
534 case bfd_link_hash_defined:
535 case bfd_link_hash_defweak:
536 oldbfd = h->root.u.def.section->owner;
539 case bfd_link_hash_common:
540 oldbfd = h->root.u.c.p->section->owner;
544 /* In cases involving weak versioned symbols, we may wind up trying
545 to merge a symbol with itself. Catch that here, to avoid the
546 confusion that results if we try to override a symbol with
547 itself. The additional tests catch cases like
548 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
549 dynamic object, which we do want to handle here. */
551 && ((abfd->flags & DYNAMIC) == 0
552 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))
555 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
556 respectively, is from a dynamic object. */
558 if ((abfd->flags & DYNAMIC) != 0)
564 olddyn = (oldbfd->flags & DYNAMIC) != 0;
569 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
570 indices used by MIPS ELF. */
571 switch (h->root.type)
577 case bfd_link_hash_defined:
578 case bfd_link_hash_defweak:
579 hsec = h->root.u.def.section;
582 case bfd_link_hash_common:
583 hsec = h->root.u.c.p->section;
590 olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0;
593 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
594 respectively, appear to be a definition rather than reference. */
596 if (bfd_is_und_section (sec) || bfd_is_com_section (sec))
601 if (h->root.type == bfd_link_hash_undefined
602 || h->root.type == bfd_link_hash_undefweak
603 || h->root.type == bfd_link_hash_common)
608 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
609 symbol, respectively, appears to be a common symbol in a dynamic
610 object. If a symbol appears in an uninitialized section, and is
611 not weak, and is not a function, then it may be a common symbol
612 which was resolved when the dynamic object was created. We want
613 to treat such symbols specially, because they raise special
614 considerations when setting the symbol size: if the symbol
615 appears as a common symbol in a regular object, and the size in
616 the regular object is larger, we must make sure that we use the
617 larger size. This problematic case can always be avoided in C,
618 but it must be handled correctly when using Fortran shared
621 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
622 likewise for OLDDYNCOMMON and OLDDEF.
624 Note that this test is just a heuristic, and that it is quite
625 possible to have an uninitialized symbol in a shared object which
626 is really a definition, rather than a common symbol. This could
627 lead to some minor confusion when the symbol really is a common
628 symbol in some regular object. However, I think it will be
633 && (sec->flags & SEC_ALLOC) != 0
634 && (sec->flags & SEC_LOAD) == 0
637 && ELF_ST_TYPE (sym->st_info) != STT_FUNC)
640 newdyncommon = false;
644 && h->root.type == bfd_link_hash_defined
645 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
646 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
647 && (h->root.u.def.section->flags & SEC_LOAD) == 0
649 && h->type != STT_FUNC)
652 olddyncommon = false;
654 /* It's OK to change the type if either the existing symbol or the
655 new symbol is weak unless it comes from a DT_NEEDED entry of
656 a shared object, in which case, the DT_NEEDED entry may not be
657 required at the run time. */
659 if ((! dt_needed && h->root.type == bfd_link_hash_defweak)
660 || h->root.type == bfd_link_hash_undefweak
662 *type_change_ok = true;
664 /* It's OK to change the size if either the existing symbol or the
665 new symbol is weak, or if the old symbol is undefined. */
668 || h->root.type == bfd_link_hash_undefined)
669 *size_change_ok = true;
671 /* If both the old and the new symbols look like common symbols in a
672 dynamic object, set the size of the symbol to the larger of the
677 && sym->st_size != h->size)
679 /* Since we think we have two common symbols, issue a multiple
680 common warning if desired. Note that we only warn if the
681 size is different. If the size is the same, we simply let
682 the old symbol override the new one as normally happens with
683 symbols defined in dynamic objects. */
685 if (! ((*info->callbacks->multiple_common)
686 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
687 h->size, abfd, bfd_link_hash_common, sym->st_size)))
690 if (sym->st_size > h->size)
691 h->size = sym->st_size;
693 *size_change_ok = true;
696 /* If we are looking at a dynamic object, and we have found a
697 definition, we need to see if the symbol was already defined by
698 some other object. If so, we want to use the existing
699 definition, and we do not want to report a multiple symbol
700 definition error; we do this by clobbering *PSEC to be
703 We treat a common symbol as a definition if the symbol in the
704 shared library is a function, since common symbols always
705 represent variables; this can cause confusion in principle, but
706 any such confusion would seem to indicate an erroneous program or
707 shared library. We also permit a common symbol in a regular
708 object to override a weak symbol in a shared object.
710 We prefer a non-weak definition in a shared library to a weak
711 definition in the executable unless it comes from a DT_NEEDED
712 entry of a shared object, in which case, the DT_NEEDED entry
713 may not be required at the run time. */
718 || (h->root.type == bfd_link_hash_common
720 || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))
721 && (h->root.type != bfd_link_hash_defweak
723 || bind == STB_WEAK))
727 newdyncommon = false;
729 *psec = sec = bfd_und_section_ptr;
730 *size_change_ok = true;
732 /* If we get here when the old symbol is a common symbol, then
733 we are explicitly letting it override a weak symbol or
734 function in a dynamic object, and we don't want to warn about
735 a type change. If the old symbol is a defined symbol, a type
736 change warning may still be appropriate. */
738 if (h->root.type == bfd_link_hash_common)
739 *type_change_ok = true;
742 /* Handle the special case of an old common symbol merging with a
743 new symbol which looks like a common symbol in a shared object.
744 We change *PSEC and *PVALUE to make the new symbol look like a
745 common symbol, and let _bfd_generic_link_add_one_symbol will do
749 && h->root.type == bfd_link_hash_common)
753 newdyncommon = false;
754 *pvalue = sym->st_size;
755 *psec = sec = bfd_com_section_ptr;
756 *size_change_ok = true;
759 /* If the old symbol is from a dynamic object, and the new symbol is
760 a definition which is not from a dynamic object, then the new
761 symbol overrides the old symbol. Symbols from regular files
762 always take precedence over symbols from dynamic objects, even if
763 they are defined after the dynamic object in the link.
765 As above, we again permit a common symbol in a regular object to
766 override a definition in a shared object if the shared object
767 symbol is a function or is weak.
769 As above, we permit a non-weak definition in a shared object to
770 override a weak definition in a regular object. */
774 || (bfd_is_com_section (sec)
775 && (h->root.type == bfd_link_hash_defweak
776 || h->type == STT_FUNC)))
779 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
781 || h->root.type == bfd_link_hash_defweak))
783 /* Change the hash table entry to undefined, and let
784 _bfd_generic_link_add_one_symbol do the right thing with the
787 h->root.type = bfd_link_hash_undefined;
788 h->root.u.undef.abfd = h->root.u.def.section->owner;
789 *size_change_ok = true;
792 olddyncommon = false;
794 /* We again permit a type change when a common symbol may be
795 overriding a function. */
797 if (bfd_is_com_section (sec))
798 *type_change_ok = true;
800 /* This union may have been set to be non-NULL when this symbol
801 was seen in a dynamic object. We must force the union to be
802 NULL, so that it is correct for a regular symbol. */
804 h->verinfo.vertree = NULL;
806 /* In this special case, if H is the target of an indirection,
807 we want the caller to frob with H rather than with the
808 indirect symbol. That will permit the caller to redefine the
809 target of the indirection, rather than the indirect symbol
810 itself. FIXME: This will break the -y option if we store a
811 symbol with a different name. */
815 /* Handle the special case of a new common symbol merging with an
816 old symbol that looks like it might be a common symbol defined in
817 a shared object. Note that we have already handled the case in
818 which a new common symbol should simply override the definition
819 in the shared library. */
822 && bfd_is_com_section (sec)
825 /* It would be best if we could set the hash table entry to a
826 common symbol, but we don't know what to use for the section
828 if (! ((*info->callbacks->multiple_common)
829 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
830 h->size, abfd, bfd_link_hash_common, sym->st_size)))
833 /* If the predumed common symbol in the dynamic object is
834 larger, pretend that the new symbol has its size. */
836 if (h->size > *pvalue)
839 /* FIXME: We no longer know the alignment required by the symbol
840 in the dynamic object, so we just wind up using the one from
841 the regular object. */
844 olddyncommon = false;
846 h->root.type = bfd_link_hash_undefined;
847 h->root.u.undef.abfd = h->root.u.def.section->owner;
849 *size_change_ok = true;
850 *type_change_ok = true;
852 h->verinfo.vertree = NULL;
855 /* Handle the special case of a weak definition in a regular object
856 followed by a non-weak definition in a shared object. In this
857 case, we prefer the definition in the shared object unless it
858 comes from a DT_NEEDED entry of a shared object, in which case,
859 the DT_NEEDED entry may not be required at the run time. */
862 && h->root.type == bfd_link_hash_defweak
867 /* To make this work we have to frob the flags so that the rest
868 of the code does not think we are using the regular
870 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
871 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
872 else if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)
873 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
874 h->elf_link_hash_flags &= ~ (ELF_LINK_HASH_DEF_REGULAR
875 | ELF_LINK_HASH_DEF_DYNAMIC);
877 /* If H is the target of an indirection, we want the caller to
878 use H rather than the indirect symbol. Otherwise if we are
879 defining a new indirect symbol we will wind up attaching it
880 to the entry we are overriding. */
884 /* Handle the special case of a non-weak definition in a shared
885 object followed by a weak definition in a regular object. In
886 this case we prefer to definition in the shared object. To make
887 this work we have to tell the caller to not treat the new symbol
891 && h->root.type != bfd_link_hash_defweak
900 /* This function is called to create an indirect symbol from the
901 default for the symbol with the default version if needed. The
902 symbol is described by H, NAME, SYM, SEC, VALUE, and OVERRIDE. We
903 set DYNSYM if the new indirect symbol is dynamic. DT_NEEDED
904 indicates if it comes from a DT_NEEDED entry of a shared object. */
907 elf_add_default_symbol (abfd, info, h, name, sym, sec, value,
908 dynsym, override, dt_needed)
910 struct bfd_link_info *info;
911 struct elf_link_hash_entry *h;
913 Elf_Internal_Sym *sym;
920 boolean type_change_ok;
921 boolean size_change_ok;
923 struct elf_link_hash_entry *hi;
924 struct elf_backend_data *bed;
928 size_t len, shortlen;
930 /* If this symbol has a version, and it is the default version, we
931 create an indirect symbol from the default name to the fully
932 decorated name. This will cause external references which do not
933 specify a version to be bound to this version of the symbol. */
934 p = strchr (name, ELF_VER_CHR);
935 if (p == NULL || p[1] != ELF_VER_CHR)
940 /* We are overridden by an old defition. We need to check if we
941 need to create the indirect symbol from the default name. */
942 hi = elf_link_hash_lookup (elf_hash_table (info), name, true,
944 BFD_ASSERT (hi != NULL);
947 while (hi->root.type == bfd_link_hash_indirect
948 || hi->root.type == bfd_link_hash_warning)
950 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
956 bed = get_elf_backend_data (abfd);
957 collect = bed->collect;
958 dynamic = (abfd->flags & DYNAMIC) != 0;
961 shortname = bfd_hash_allocate (&info->hash->table, shortlen + 1);
962 if (shortname == NULL)
964 memcpy (shortname, name, shortlen);
965 shortname[shortlen] = '\0';
967 /* We are going to create a new symbol. Merge it with any existing
968 symbol with this name. For the purposes of the merge, act as
969 though we were defining the symbol we just defined, although we
970 actually going to define an indirect symbol. */
971 type_change_ok = false;
972 size_change_ok = false;
973 if (! elf_merge_symbol (abfd, info, shortname, sym, sec, value,
974 &hi, &override, &type_change_ok,
975 &size_change_ok, dt_needed))
980 if (! (_bfd_generic_link_add_one_symbol
981 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
982 (bfd_vma) 0, name, false, collect,
983 (struct bfd_link_hash_entry **) &hi)))
988 /* In this case the symbol named SHORTNAME is overriding the
989 indirect symbol we want to add. We were planning on making
990 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
991 is the name without a version. NAME is the fully versioned
992 name, and it is the default version.
994 Overriding means that we already saw a definition for the
995 symbol SHORTNAME in a regular object, and it is overriding
996 the symbol defined in the dynamic object.
998 When this happens, we actually want to change NAME, the
999 symbol we just added, to refer to SHORTNAME. This will cause
1000 references to NAME in the shared object to become references
1001 to SHORTNAME in the regular object. This is what we expect
1002 when we override a function in a shared object: that the
1003 references in the shared object will be mapped to the
1004 definition in the regular object. */
1006 while (hi->root.type == bfd_link_hash_indirect
1007 || hi->root.type == bfd_link_hash_warning)
1008 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1010 h->root.type = bfd_link_hash_indirect;
1011 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1012 if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC)
1014 h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC;
1015 hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
1016 if (hi->elf_link_hash_flags
1017 & (ELF_LINK_HASH_REF_REGULAR
1018 | ELF_LINK_HASH_DEF_REGULAR))
1020 if (! _bfd_elf_link_record_dynamic_symbol (info, hi))
1025 /* Now set HI to H, so that the following code will set the
1026 other fields correctly. */
1030 /* If there is a duplicate definition somewhere, then HI may not
1031 point to an indirect symbol. We will have reported an error to
1032 the user in that case. */
1034 if (hi->root.type == bfd_link_hash_indirect)
1036 struct elf_link_hash_entry *ht;
1038 /* If the symbol became indirect, then we assume that we have
1039 not seen a definition before. */
1040 BFD_ASSERT ((hi->elf_link_hash_flags
1041 & (ELF_LINK_HASH_DEF_DYNAMIC
1042 | ELF_LINK_HASH_DEF_REGULAR)) == 0);
1044 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1045 (*bed->elf_backend_copy_indirect_symbol) (ht, hi);
1047 /* See if the new flags lead us to realize that the symbol must
1054 || ((hi->elf_link_hash_flags
1055 & ELF_LINK_HASH_REF_DYNAMIC) != 0))
1060 if ((hi->elf_link_hash_flags
1061 & ELF_LINK_HASH_REF_REGULAR) != 0)
1067 /* We also need to define an indirection from the nondefault version
1070 len = strlen (name);
1071 shortname = bfd_hash_allocate (&info->hash->table, len);
1072 if (shortname == NULL)
1074 memcpy (shortname, name, shortlen);
1075 memcpy (shortname + shortlen, p + 1, len - shortlen);
1077 /* Once again, merge with any existing symbol. */
1078 type_change_ok = false;
1079 size_change_ok = false;
1080 if (! elf_merge_symbol (abfd, info, shortname, sym, sec, value,
1081 &hi, &override, &type_change_ok,
1082 &size_change_ok, dt_needed))
1087 /* Here SHORTNAME is a versioned name, so we don't expect to see
1088 the type of override we do in the case above. */
1089 (*_bfd_error_handler)
1090 (_("%s: warning: unexpected redefinition of `%s'"),
1091 bfd_archive_filename (abfd), shortname);
1095 if (! (_bfd_generic_link_add_one_symbol
1096 (info, abfd, shortname, BSF_INDIRECT,
1097 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1098 collect, (struct bfd_link_hash_entry **) &hi)))
1101 /* If there is a duplicate definition somewhere, then HI may not
1102 point to an indirect symbol. We will have reported an error
1103 to the user in that case. */
1105 if (hi->root.type == bfd_link_hash_indirect)
1107 /* If the symbol became indirect, then we assume that we have
1108 not seen a definition before. */
1109 BFD_ASSERT ((hi->elf_link_hash_flags
1110 & (ELF_LINK_HASH_DEF_DYNAMIC
1111 | ELF_LINK_HASH_DEF_REGULAR)) == 0);
1113 (*bed->elf_backend_copy_indirect_symbol) (h, hi);
1115 /* See if the new flags lead us to realize that the symbol
1122 || ((hi->elf_link_hash_flags
1123 & ELF_LINK_HASH_REF_DYNAMIC) != 0))
1128 if ((hi->elf_link_hash_flags
1129 & ELF_LINK_HASH_REF_REGULAR) != 0)
1139 /* Add symbols from an ELF object file to the linker hash table. */
1142 elf_link_add_object_symbols (abfd, info)
1144 struct bfd_link_info *info;
1146 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
1147 const Elf_Internal_Sym *,
1148 const char **, flagword *,
1149 asection **, bfd_vma *));
1150 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
1151 asection *, const Elf_Internal_Rela *));
1153 Elf_Internal_Shdr *hdr;
1154 bfd_size_type symcount;
1155 bfd_size_type extsymcount;
1156 bfd_size_type extsymoff;
1157 struct elf_link_hash_entry **sym_hash;
1159 Elf_External_Versym *extversym = NULL;
1160 Elf_External_Versym *ever;
1161 struct elf_link_hash_entry *weaks;
1162 Elf_Internal_Sym *isymbuf = NULL;
1163 Elf_Internal_Sym *isym;
1164 Elf_Internal_Sym *isymend;
1165 struct elf_backend_data *bed;
1167 struct elf_link_hash_table * hash_table;
1170 hash_table = elf_hash_table (info);
1172 bed = get_elf_backend_data (abfd);
1173 add_symbol_hook = bed->elf_add_symbol_hook;
1174 collect = bed->collect;
1176 if ((abfd->flags & DYNAMIC) == 0)
1182 /* You can't use -r against a dynamic object. Also, there's no
1183 hope of using a dynamic object which does not exactly match
1184 the format of the output file. */
1185 if (info->relocateable || info->hash->creator != abfd->xvec)
1187 bfd_set_error (bfd_error_invalid_operation);
1192 /* As a GNU extension, any input sections which are named
1193 .gnu.warning.SYMBOL are treated as warning symbols for the given
1194 symbol. This differs from .gnu.warning sections, which generate
1195 warnings when they are included in an output file. */
1200 for (s = abfd->sections; s != NULL; s = s->next)
1204 name = bfd_get_section_name (abfd, s);
1205 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
1210 name += sizeof ".gnu.warning." - 1;
1212 /* If this is a shared object, then look up the symbol
1213 in the hash table. If it is there, and it is already
1214 been defined, then we will not be using the entry
1215 from this shared object, so we don't need to warn.
1216 FIXME: If we see the definition in a regular object
1217 later on, we will warn, but we shouldn't. The only
1218 fix is to keep track of what warnings we are supposed
1219 to emit, and then handle them all at the end of the
1221 if (dynamic && abfd->xvec == info->hash->creator)
1223 struct elf_link_hash_entry *h;
1225 h = elf_link_hash_lookup (hash_table, name,
1226 false, false, true);
1228 /* FIXME: What about bfd_link_hash_common? */
1230 && (h->root.type == bfd_link_hash_defined
1231 || h->root.type == bfd_link_hash_defweak))
1233 /* We don't want to issue this warning. Clobber
1234 the section size so that the warning does not
1235 get copied into the output file. */
1241 sz = bfd_section_size (abfd, s);
1242 msg = (char *) bfd_alloc (abfd, sz + 1);
1246 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
1251 if (! (_bfd_generic_link_add_one_symbol
1252 (info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg,
1253 false, collect, (struct bfd_link_hash_entry **) NULL)))
1256 if (! info->relocateable)
1258 /* Clobber the section size so that the warning does
1259 not get copied into the output file. */
1269 /* If we are creating a shared library, create all the dynamic
1270 sections immediately. We need to attach them to something,
1271 so we attach them to this BFD, provided it is the right
1272 format. FIXME: If there are no input BFD's of the same
1273 format as the output, we can't make a shared library. */
1275 && is_elf_hash_table (info)
1276 && ! hash_table->dynamic_sections_created
1277 && abfd->xvec == info->hash->creator)
1279 if (! elf_link_create_dynamic_sections (abfd, info))
1283 else if (! is_elf_hash_table (info))
1290 bfd_size_type oldsize;
1291 bfd_size_type strindex;
1293 /* Find the name to use in a DT_NEEDED entry that refers to this
1294 object. If the object has a DT_SONAME entry, we use it.
1295 Otherwise, if the generic linker stuck something in
1296 elf_dt_name, we use that. Otherwise, we just use the file
1297 name. If the generic linker put a null string into
1298 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1299 there is a DT_SONAME entry. */
1301 name = bfd_get_filename (abfd);
1302 if (elf_dt_name (abfd) != NULL)
1304 name = elf_dt_name (abfd);
1307 if (elf_dt_soname (abfd) != NULL)
1313 s = bfd_get_section_by_name (abfd, ".dynamic");
1316 Elf_External_Dyn *dynbuf = NULL;
1317 Elf_External_Dyn *extdyn;
1318 Elf_External_Dyn *extdynend;
1320 unsigned long shlink;
1324 dynbuf = (Elf_External_Dyn *) bfd_malloc (s->_raw_size);
1328 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
1329 (file_ptr) 0, s->_raw_size))
1330 goto error_free_dyn;
1332 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1334 goto error_free_dyn;
1335 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
1338 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
1341 for (; extdyn < extdynend; extdyn++)
1343 Elf_Internal_Dyn dyn;
1345 elf_swap_dyn_in (abfd, extdyn, &dyn);
1346 if (dyn.d_tag == DT_SONAME)
1348 unsigned int tagv = dyn.d_un.d_val;
1349 name = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1351 goto error_free_dyn;
1353 if (dyn.d_tag == DT_NEEDED)
1355 struct bfd_link_needed_list *n, **pn;
1357 unsigned int tagv = dyn.d_un.d_val;
1359 amt = sizeof (struct bfd_link_needed_list);
1360 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1361 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1362 if (n == NULL || fnm == NULL)
1363 goto error_free_dyn;
1364 amt = strlen (fnm) + 1;
1365 anm = bfd_alloc (abfd, amt);
1367 goto error_free_dyn;
1368 memcpy (anm, fnm, (size_t) amt);
1372 for (pn = & hash_table->needed;
1378 if (dyn.d_tag == DT_RUNPATH)
1380 struct bfd_link_needed_list *n, **pn;
1382 unsigned int tagv = dyn.d_un.d_val;
1384 /* When we see DT_RPATH before DT_RUNPATH, we have
1385 to clear runpath. Do _NOT_ bfd_release, as that
1386 frees all more recently bfd_alloc'd blocks as
1388 if (rpath && hash_table->runpath)
1389 hash_table->runpath = NULL;
1391 amt = sizeof (struct bfd_link_needed_list);
1392 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1393 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1394 if (n == NULL || fnm == NULL)
1395 goto error_free_dyn;
1396 amt = strlen (fnm) + 1;
1397 anm = bfd_alloc (abfd, amt);
1399 goto error_free_dyn;
1400 memcpy (anm, fnm, (size_t) amt);
1404 for (pn = & hash_table->runpath;
1412 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1413 if (!runpath && dyn.d_tag == DT_RPATH)
1415 struct bfd_link_needed_list *n, **pn;
1417 unsigned int tagv = dyn.d_un.d_val;
1419 amt = sizeof (struct bfd_link_needed_list);
1420 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1421 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1422 if (n == NULL || fnm == NULL)
1423 goto error_free_dyn;
1424 amt = strlen (fnm) + 1;
1425 anm = bfd_alloc (abfd, amt);
1432 memcpy (anm, fnm, (size_t) amt);
1436 for (pn = & hash_table->runpath;
1448 /* We do not want to include any of the sections in a dynamic
1449 object in the output file. We hack by simply clobbering the
1450 list of sections in the BFD. This could be handled more
1451 cleanly by, say, a new section flag; the existing
1452 SEC_NEVER_LOAD flag is not the one we want, because that one
1453 still implies that the section takes up space in the output
1455 bfd_section_list_clear (abfd);
1457 /* If this is the first dynamic object found in the link, create
1458 the special sections required for dynamic linking. */
1459 if (! hash_table->dynamic_sections_created)
1460 if (! elf_link_create_dynamic_sections (abfd, info))
1465 /* Add a DT_NEEDED entry for this dynamic object. */
1466 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
1467 strindex = _bfd_elf_strtab_add (hash_table->dynstr, name, false);
1468 if (strindex == (bfd_size_type) -1)
1471 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
1474 Elf_External_Dyn *dyncon, *dynconend;
1476 /* The hash table size did not change, which means that
1477 the dynamic object name was already entered. If we
1478 have already included this dynamic object in the
1479 link, just ignore it. There is no reason to include
1480 a particular dynamic object more than once. */
1481 sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
1482 BFD_ASSERT (sdyn != NULL);
1484 dyncon = (Elf_External_Dyn *) sdyn->contents;
1485 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1487 for (; dyncon < dynconend; dyncon++)
1489 Elf_Internal_Dyn dyn;
1491 elf_swap_dyn_in (hash_table->dynobj, dyncon, & dyn);
1492 if (dyn.d_tag == DT_NEEDED
1493 && dyn.d_un.d_val == strindex)
1495 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
1501 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NEEDED, strindex))
1505 /* Save the SONAME, if there is one, because sometimes the
1506 linker emulation code will need to know it. */
1508 name = basename (bfd_get_filename (abfd));
1509 elf_dt_name (abfd) = name;
1512 /* If this is a dynamic object, we always link against the .dynsym
1513 symbol table, not the .symtab symbol table. The dynamic linker
1514 will only see the .dynsym symbol table, so there is no reason to
1515 look at .symtab for a dynamic object. */
1517 if (! dynamic || elf_dynsymtab (abfd) == 0)
1518 hdr = &elf_tdata (abfd)->symtab_hdr;
1520 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
1522 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1524 /* The sh_info field of the symtab header tells us where the
1525 external symbols start. We don't care about the local symbols at
1527 if (elf_bad_symtab (abfd))
1529 extsymcount = symcount;
1534 extsymcount = symcount - hdr->sh_info;
1535 extsymoff = hdr->sh_info;
1539 if (extsymcount != 0)
1541 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
1543 if (isymbuf == NULL)
1546 /* We store a pointer to the hash table entry for each external
1548 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
1549 sym_hash = (struct elf_link_hash_entry **) bfd_alloc (abfd, amt);
1550 if (sym_hash == NULL)
1551 goto error_free_sym;
1552 elf_sym_hashes (abfd) = sym_hash;
1557 /* Read in any version definitions. */
1558 if (! _bfd_elf_slurp_version_tables (abfd))
1559 goto error_free_sym;
1561 /* Read in the symbol versions, but don't bother to convert them
1562 to internal format. */
1563 if (elf_dynversym (abfd) != 0)
1565 Elf_Internal_Shdr *versymhdr;
1567 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
1568 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
1569 if (extversym == NULL)
1570 goto error_free_sym;
1571 amt = versymhdr->sh_size;
1572 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
1573 || bfd_bread ((PTR) extversym, amt, abfd) != amt)
1574 goto error_free_vers;
1580 ever = extversym != NULL ? extversym + extsymoff : NULL;
1581 for (isym = isymbuf, isymend = isymbuf + extsymcount;
1583 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
1590 struct elf_link_hash_entry *h;
1592 boolean size_change_ok, type_change_ok;
1593 boolean new_weakdef;
1594 unsigned int old_alignment;
1599 flags = BSF_NO_FLAGS;
1601 value = isym->st_value;
1604 bind = ELF_ST_BIND (isym->st_info);
1605 if (bind == STB_LOCAL)
1607 /* This should be impossible, since ELF requires that all
1608 global symbols follow all local symbols, and that sh_info
1609 point to the first global symbol. Unfortunatealy, Irix 5
1613 else if (bind == STB_GLOBAL)
1615 if (isym->st_shndx != SHN_UNDEF
1616 && isym->st_shndx != SHN_COMMON)
1619 else if (bind == STB_WEAK)
1623 /* Leave it up to the processor backend. */
1626 if (isym->st_shndx == SHN_UNDEF)
1627 sec = bfd_und_section_ptr;
1628 else if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
1630 sec = section_from_elf_index (abfd, isym->st_shndx);
1632 sec = bfd_abs_section_ptr;
1633 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
1636 else if (isym->st_shndx == SHN_ABS)
1637 sec = bfd_abs_section_ptr;
1638 else if (isym->st_shndx == SHN_COMMON)
1640 sec = bfd_com_section_ptr;
1641 /* What ELF calls the size we call the value. What ELF
1642 calls the value we call the alignment. */
1643 value = isym->st_size;
1647 /* Leave it up to the processor backend. */
1650 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
1652 if (name == (const char *) NULL)
1653 goto error_free_vers;
1655 if (isym->st_shndx == SHN_COMMON
1656 && ELF_ST_TYPE (isym->st_info) == STT_TLS)
1658 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
1662 tcomm = bfd_make_section (abfd, ".tcommon");
1664 || !bfd_set_section_flags (abfd, tcomm, (SEC_ALLOC
1666 | SEC_LINKER_CREATED
1667 | SEC_THREAD_LOCAL)))
1668 goto error_free_vers;
1672 else if (add_symbol_hook)
1674 if (! (*add_symbol_hook) (abfd, info, isym, &name, &flags, &sec,
1676 goto error_free_vers;
1678 /* The hook function sets the name to NULL if this symbol
1679 should be skipped for some reason. */
1680 if (name == (const char *) NULL)
1684 /* Sanity check that all possibilities were handled. */
1685 if (sec == (asection *) NULL)
1687 bfd_set_error (bfd_error_bad_value);
1688 goto error_free_vers;
1691 if (bfd_is_und_section (sec)
1692 || bfd_is_com_section (sec))
1697 size_change_ok = false;
1698 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
1700 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1702 Elf_Internal_Versym iver;
1703 unsigned int vernum = 0;
1707 _bfd_elf_swap_versym_in (abfd, ever, &iver);
1708 vernum = iver.vs_vers & VERSYM_VERSION;
1710 /* If this is a hidden symbol, or if it is not version
1711 1, we append the version name to the symbol name.
1712 However, we do not modify a non-hidden absolute
1713 symbol, because it might be the version symbol
1714 itself. FIXME: What if it isn't? */
1715 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
1716 || (vernum > 1 && ! bfd_is_abs_section (sec)))
1719 size_t namelen, verlen, newlen;
1722 if (isym->st_shndx != SHN_UNDEF)
1724 if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
1726 (*_bfd_error_handler)
1727 (_("%s: %s: invalid version %u (max %d)"),
1728 bfd_archive_filename (abfd), name, vernum,
1729 elf_tdata (abfd)->dynverdef_hdr.sh_info);
1730 bfd_set_error (bfd_error_bad_value);
1731 goto error_free_vers;
1733 else if (vernum > 1)
1735 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
1741 /* We cannot simply test for the number of
1742 entries in the VERNEED section since the
1743 numbers for the needed versions do not start
1745 Elf_Internal_Verneed *t;
1748 for (t = elf_tdata (abfd)->verref;
1752 Elf_Internal_Vernaux *a;
1754 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1756 if (a->vna_other == vernum)
1758 verstr = a->vna_nodename;
1767 (*_bfd_error_handler)
1768 (_("%s: %s: invalid needed version %d"),
1769 bfd_archive_filename (abfd), name, vernum);
1770 bfd_set_error (bfd_error_bad_value);
1771 goto error_free_vers;
1775 namelen = strlen (name);
1776 verlen = strlen (verstr);
1777 newlen = namelen + verlen + 2;
1778 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
1779 && isym->st_shndx != SHN_UNDEF)
1782 newname = (char *) bfd_alloc (abfd, (bfd_size_type) newlen);
1783 if (newname == NULL)
1784 goto error_free_vers;
1785 memcpy (newname, name, namelen);
1786 p = newname + namelen;
1788 /* If this is a defined non-hidden version symbol,
1789 we add another @ to the name. This indicates the
1790 default version of the symbol. */
1791 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
1792 && isym->st_shndx != SHN_UNDEF)
1794 memcpy (p, verstr, verlen + 1);
1800 if (! elf_merge_symbol (abfd, info, name, isym, &sec, &value,
1801 sym_hash, &override, &type_change_ok,
1802 &size_change_ok, dt_needed))
1803 goto error_free_vers;
1809 while (h->root.type == bfd_link_hash_indirect
1810 || h->root.type == bfd_link_hash_warning)
1811 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1813 /* Remember the old alignment if this is a common symbol, so
1814 that we don't reduce the alignment later on. We can't
1815 check later, because _bfd_generic_link_add_one_symbol
1816 will set a default for the alignment which we want to
1818 if (h->root.type == bfd_link_hash_common)
1819 old_alignment = h->root.u.c.p->alignment_power;
1821 if (elf_tdata (abfd)->verdef != NULL
1825 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
1828 if (! (_bfd_generic_link_add_one_symbol
1829 (info, abfd, name, flags, sec, value, (const char *) NULL,
1830 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
1831 goto error_free_vers;
1834 while (h->root.type == bfd_link_hash_indirect
1835 || h->root.type == bfd_link_hash_warning)
1836 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1839 new_weakdef = false;
1842 && (flags & BSF_WEAK) != 0
1843 && ELF_ST_TYPE (isym->st_info) != STT_FUNC
1844 && info->hash->creator->flavour == bfd_target_elf_flavour
1845 && h->weakdef == NULL)
1847 /* Keep a list of all weak defined non function symbols from
1848 a dynamic object, using the weakdef field. Later in this
1849 function we will set the weakdef field to the correct
1850 value. We only put non-function symbols from dynamic
1851 objects on this list, because that happens to be the only
1852 time we need to know the normal symbol corresponding to a
1853 weak symbol, and the information is time consuming to
1854 figure out. If the weakdef field is not already NULL,
1855 then this symbol was already defined by some previous
1856 dynamic object, and we will be using that previous
1857 definition anyhow. */
1864 /* Set the alignment of a common symbol. */
1865 if (isym->st_shndx == SHN_COMMON
1866 && h->root.type == bfd_link_hash_common)
1870 align = bfd_log2 (isym->st_value);
1871 if (align > old_alignment
1872 /* Permit an alignment power of zero if an alignment of one
1873 is specified and no other alignments have been specified. */
1874 || (isym->st_value == 1 && old_alignment == 0))
1875 h->root.u.c.p->alignment_power = align;
1878 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1884 /* Remember the symbol size and type. */
1885 if (isym->st_size != 0
1886 && (definition || h->size == 0))
1888 if (h->size != 0 && h->size != isym->st_size && ! size_change_ok)
1889 (*_bfd_error_handler)
1890 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1891 name, (unsigned long) h->size,
1892 (unsigned long) isym->st_size, bfd_archive_filename (abfd));
1894 h->size = isym->st_size;
1897 /* If this is a common symbol, then we always want H->SIZE
1898 to be the size of the common symbol. The code just above
1899 won't fix the size if a common symbol becomes larger. We
1900 don't warn about a size change here, because that is
1901 covered by --warn-common. */
1902 if (h->root.type == bfd_link_hash_common)
1903 h->size = h->root.u.c.size;
1905 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
1906 && (definition || h->type == STT_NOTYPE))
1908 if (h->type != STT_NOTYPE
1909 && h->type != ELF_ST_TYPE (isym->st_info)
1910 && ! type_change_ok)
1911 (*_bfd_error_handler)
1912 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1913 name, h->type, ELF_ST_TYPE (isym->st_info),
1914 bfd_archive_filename (abfd));
1916 h->type = ELF_ST_TYPE (isym->st_info);
1919 /* If st_other has a processor-specific meaning, specific code
1920 might be needed here. */
1921 if (isym->st_other != 0)
1923 /* Combine visibilities, using the most constraining one. */
1924 unsigned char hvis = ELF_ST_VISIBILITY (h->other);
1925 unsigned char symvis = ELF_ST_VISIBILITY (isym->st_other);
1927 if (symvis && (hvis > symvis || hvis == 0))
1928 h->other = isym->st_other;
1930 /* If neither has visibility, use the st_other of the
1931 definition. This is an arbitrary choice, since the
1932 other bits have no general meaning. */
1933 if (!symvis && !hvis
1934 && (definition || h->other == 0))
1935 h->other = isym->st_other;
1938 /* Set a flag in the hash table entry indicating the type of
1939 reference or definition we just found. Keep a count of
1940 the number of dynamic symbols we find. A dynamic symbol
1941 is one which is referenced or defined by both a regular
1942 object and a shared object. */
1943 old_flags = h->elf_link_hash_flags;
1949 new_flag = ELF_LINK_HASH_REF_REGULAR;
1950 if (bind != STB_WEAK)
1951 new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK;
1954 new_flag = ELF_LINK_HASH_DEF_REGULAR;
1956 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
1957 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
1963 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
1965 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
1966 if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
1967 | ELF_LINK_HASH_REF_REGULAR)) != 0
1968 || (h->weakdef != NULL
1970 && h->weakdef->dynindx != -1))
1974 h->elf_link_hash_flags |= new_flag;
1976 /* Check to see if we need to add an indirect symbol for
1977 the default name. */
1978 if (definition || h->root.type == bfd_link_hash_common)
1979 if (! elf_add_default_symbol (abfd, info, h, name, isym,
1980 &sec, &value, &dynsym,
1981 override, dt_needed))
1982 goto error_free_vers;
1984 if (dynsym && h->dynindx == -1)
1986 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
1987 goto error_free_vers;
1988 if (h->weakdef != NULL
1990 && h->weakdef->dynindx == -1)
1992 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
1993 goto error_free_vers;
1996 else if (dynsym && h->dynindx != -1)
1997 /* If the symbol already has a dynamic index, but
1998 visibility says it should not be visible, turn it into
2000 switch (ELF_ST_VISIBILITY (h->other))
2004 (*bed->elf_backend_hide_symbol) (info, h, true);
2008 if (dt_needed && definition
2009 && (h->elf_link_hash_flags
2010 & ELF_LINK_HASH_REF_REGULAR) != 0)
2012 bfd_size_type oldsize;
2013 bfd_size_type strindex;
2015 if (! is_elf_hash_table (info))
2016 goto error_free_vers;
2018 /* The symbol from a DT_NEEDED object is referenced from
2019 the regular object to create a dynamic executable. We
2020 have to make sure there is a DT_NEEDED entry for it. */
2023 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
2024 strindex = _bfd_elf_strtab_add (hash_table->dynstr,
2025 elf_dt_soname (abfd), false);
2026 if (strindex == (bfd_size_type) -1)
2027 goto error_free_vers;
2029 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
2032 Elf_External_Dyn *dyncon, *dynconend;
2034 sdyn = bfd_get_section_by_name (hash_table->dynobj,
2036 BFD_ASSERT (sdyn != NULL);
2038 dyncon = (Elf_External_Dyn *) sdyn->contents;
2039 dynconend = (Elf_External_Dyn *) (sdyn->contents +
2041 for (; dyncon < dynconend; dyncon++)
2043 Elf_Internal_Dyn dyn;
2045 elf_swap_dyn_in (hash_table->dynobj,
2047 BFD_ASSERT (dyn.d_tag != DT_NEEDED ||
2048 dyn.d_un.d_val != strindex);
2052 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NEEDED, strindex))
2053 goto error_free_vers;
2058 if (extversym != NULL)
2064 if (isymbuf != NULL)
2068 /* Now set the weakdefs field correctly for all the weak defined
2069 symbols we found. The only way to do this is to search all the
2070 symbols. Since we only need the information for non functions in
2071 dynamic objects, that's the only time we actually put anything on
2072 the list WEAKS. We need this information so that if a regular
2073 object refers to a symbol defined weakly in a dynamic object, the
2074 real symbol in the dynamic object is also put in the dynamic
2075 symbols; we also must arrange for both symbols to point to the
2076 same memory location. We could handle the general case of symbol
2077 aliasing, but a general symbol alias can only be generated in
2078 assembler code, handling it correctly would be very time
2079 consuming, and other ELF linkers don't handle general aliasing
2081 while (weaks != NULL)
2083 struct elf_link_hash_entry *hlook;
2086 struct elf_link_hash_entry **hpp;
2087 struct elf_link_hash_entry **hppend;
2090 weaks = hlook->weakdef;
2091 hlook->weakdef = NULL;
2093 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
2094 || hlook->root.type == bfd_link_hash_defweak
2095 || hlook->root.type == bfd_link_hash_common
2096 || hlook->root.type == bfd_link_hash_indirect);
2097 slook = hlook->root.u.def.section;
2098 vlook = hlook->root.u.def.value;
2100 hpp = elf_sym_hashes (abfd);
2101 hppend = hpp + extsymcount;
2102 for (; hpp < hppend; hpp++)
2104 struct elf_link_hash_entry *h;
2107 if (h != NULL && h != hlook
2108 && h->root.type == bfd_link_hash_defined
2109 && h->root.u.def.section == slook
2110 && h->root.u.def.value == vlook)
2114 /* If the weak definition is in the list of dynamic
2115 symbols, make sure the real definition is put there
2117 if (hlook->dynindx != -1
2118 && h->dynindx == -1)
2120 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2124 /* If the real definition is in the list of dynamic
2125 symbols, make sure the weak definition is put there
2126 as well. If we don't do this, then the dynamic
2127 loader might not merge the entries for the real
2128 definition and the weak definition. */
2129 if (h->dynindx != -1
2130 && hlook->dynindx == -1)
2132 if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
2140 /* If this object is the same format as the output object, and it is
2141 not a shared library, then let the backend look through the
2144 This is required to build global offset table entries and to
2145 arrange for dynamic relocs. It is not required for the
2146 particular common case of linking non PIC code, even when linking
2147 against shared libraries, but unfortunately there is no way of
2148 knowing whether an object file has been compiled PIC or not.
2149 Looking through the relocs is not particularly time consuming.
2150 The problem is that we must either (1) keep the relocs in memory,
2151 which causes the linker to require additional runtime memory or
2152 (2) read the relocs twice from the input file, which wastes time.
2153 This would be a good case for using mmap.
2155 I have no idea how to handle linking PIC code into a file of a
2156 different format. It probably can't be done. */
2157 check_relocs = get_elf_backend_data (abfd)->check_relocs;
2159 && abfd->xvec == info->hash->creator
2160 && check_relocs != NULL)
2164 for (o = abfd->sections; o != NULL; o = o->next)
2166 Elf_Internal_Rela *internal_relocs;
2169 if ((o->flags & SEC_RELOC) == 0
2170 || o->reloc_count == 0
2171 || ((info->strip == strip_all || info->strip == strip_debugger)
2172 && (o->flags & SEC_DEBUGGING) != 0)
2173 || bfd_is_abs_section (o->output_section))
2176 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2177 (abfd, o, (PTR) NULL,
2178 (Elf_Internal_Rela *) NULL,
2179 info->keep_memory));
2180 if (internal_relocs == NULL)
2183 ok = (*check_relocs) (abfd, info, o, internal_relocs);
2185 if (elf_section_data (o)->relocs != internal_relocs)
2186 free (internal_relocs);
2193 /* If this is a non-traditional, non-relocateable link, try to
2194 optimize the handling of the .stab/.stabstr sections. */
2196 && ! info->relocateable
2197 && ! info->traditional_format
2198 && info->hash->creator->flavour == bfd_target_elf_flavour
2199 && is_elf_hash_table (info)
2200 && (info->strip != strip_all && info->strip != strip_debugger))
2202 asection *stab, *stabstr;
2204 stab = bfd_get_section_by_name (abfd, ".stab");
2206 && (stab->flags & SEC_MERGE) == 0
2207 && !bfd_is_abs_section (stab->output_section))
2209 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
2211 if (stabstr != NULL)
2213 struct bfd_elf_section_data *secdata;
2215 secdata = elf_section_data (stab);
2216 if (! _bfd_link_section_stabs (abfd,
2217 & hash_table->stab_info,
2219 &secdata->sec_info))
2221 if (secdata->sec_info)
2222 secdata->sec_info_type = ELF_INFO_TYPE_STABS;
2227 if (! info->relocateable && ! dynamic
2228 && is_elf_hash_table (info))
2232 for (s = abfd->sections; s != NULL; s = s->next)
2233 if ((s->flags & SEC_MERGE) != 0
2234 && !bfd_is_abs_section (s->output_section))
2236 struct bfd_elf_section_data *secdata;
2238 secdata = elf_section_data (s);
2239 if (! _bfd_merge_section (abfd,
2240 & hash_table->merge_info,
2241 s, &secdata->sec_info))
2243 else if (secdata->sec_info)
2244 secdata->sec_info_type = ELF_INFO_TYPE_MERGE;
2248 if (is_elf_hash_table (info))
2250 /* Add this bfd to the loaded list. */
2251 struct elf_link_loaded_list *n;
2253 n = ((struct elf_link_loaded_list *)
2254 bfd_alloc (abfd, sizeof (struct elf_link_loaded_list)));
2258 n->next = hash_table->loaded;
2259 hash_table->loaded = n;
2265 if (extversym != NULL)
2268 if (isymbuf != NULL)
2274 /* Create some sections which will be filled in with dynamic linking
2275 information. ABFD is an input file which requires dynamic sections
2276 to be created. The dynamic sections take up virtual memory space
2277 when the final executable is run, so we need to create them before
2278 addresses are assigned to the output sections. We work out the
2279 actual contents and size of these sections later. */
2282 elf_link_create_dynamic_sections (abfd, info)
2284 struct bfd_link_info *info;
2287 register asection *s;
2288 struct elf_link_hash_entry *h;
2289 struct elf_backend_data *bed;
2291 if (! is_elf_hash_table (info))
2294 if (elf_hash_table (info)->dynamic_sections_created)
2297 /* Make sure that all dynamic sections use the same input BFD. */
2298 if (elf_hash_table (info)->dynobj == NULL)
2299 elf_hash_table (info)->dynobj = abfd;
2301 abfd = elf_hash_table (info)->dynobj;
2303 /* Note that we set the SEC_IN_MEMORY flag for all of these
2305 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
2306 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2308 /* A dynamically linked executable has a .interp section, but a
2309 shared library does not. */
2312 s = bfd_make_section (abfd, ".interp");
2314 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2318 if (! info->traditional_format
2319 && info->hash->creator->flavour == bfd_target_elf_flavour)
2321 s = bfd_make_section (abfd, ".eh_frame_hdr");
2323 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2324 || ! bfd_set_section_alignment (abfd, s, 2))
2328 /* Create sections to hold version informations. These are removed
2329 if they are not needed. */
2330 s = bfd_make_section (abfd, ".gnu.version_d");
2332 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2333 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2336 s = bfd_make_section (abfd, ".gnu.version");
2338 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2339 || ! bfd_set_section_alignment (abfd, s, 1))
2342 s = bfd_make_section (abfd, ".gnu.version_r");
2344 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2345 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2348 s = bfd_make_section (abfd, ".dynsym");
2350 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2351 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2354 s = bfd_make_section (abfd, ".dynstr");
2356 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2359 /* Create a strtab to hold the dynamic symbol names. */
2360 if (elf_hash_table (info)->dynstr == NULL)
2362 elf_hash_table (info)->dynstr = _bfd_elf_strtab_init ();
2363 if (elf_hash_table (info)->dynstr == NULL)
2367 s = bfd_make_section (abfd, ".dynamic");
2369 || ! bfd_set_section_flags (abfd, s, flags)
2370 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2373 /* The special symbol _DYNAMIC is always set to the start of the
2374 .dynamic section. This call occurs before we have processed the
2375 symbols for any dynamic object, so we don't have to worry about
2376 overriding a dynamic definition. We could set _DYNAMIC in a
2377 linker script, but we only want to define it if we are, in fact,
2378 creating a .dynamic section. We don't want to define it if there
2379 is no .dynamic section, since on some ELF platforms the start up
2380 code examines it to decide how to initialize the process. */
2382 if (! (_bfd_generic_link_add_one_symbol
2383 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
2384 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
2385 (struct bfd_link_hash_entry **) &h)))
2387 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2388 h->type = STT_OBJECT;
2391 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
2394 bed = get_elf_backend_data (abfd);
2396 s = bfd_make_section (abfd, ".hash");
2398 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2399 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2401 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
2403 /* Let the backend create the rest of the sections. This lets the
2404 backend set the right flags. The backend will normally create
2405 the .got and .plt sections. */
2406 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
2409 elf_hash_table (info)->dynamic_sections_created = true;
2414 /* Add an entry to the .dynamic table. */
2417 elf_add_dynamic_entry (info, tag, val)
2418 struct bfd_link_info *info;
2422 Elf_Internal_Dyn dyn;
2425 bfd_size_type newsize;
2426 bfd_byte *newcontents;
2428 if (! is_elf_hash_table (info))
2431 dynobj = elf_hash_table (info)->dynobj;
2433 s = bfd_get_section_by_name (dynobj, ".dynamic");
2434 BFD_ASSERT (s != NULL);
2436 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
2437 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
2438 if (newcontents == NULL)
2442 dyn.d_un.d_val = val;
2443 elf_swap_dyn_out (dynobj, &dyn,
2444 (Elf_External_Dyn *) (newcontents + s->_raw_size));
2446 s->_raw_size = newsize;
2447 s->contents = newcontents;
2452 /* Read and swap the relocs from the section indicated by SHDR. This
2453 may be either a REL or a RELA section. The relocations are
2454 translated into RELA relocations and stored in INTERNAL_RELOCS,
2455 which should have already been allocated to contain enough space.
2456 The EXTERNAL_RELOCS are a buffer where the external form of the
2457 relocations should be stored.
2459 Returns false if something goes wrong. */
2462 elf_link_read_relocs_from_section (abfd, shdr, external_relocs,
2465 Elf_Internal_Shdr *shdr;
2466 PTR external_relocs;
2467 Elf_Internal_Rela *internal_relocs;
2469 struct elf_backend_data *bed;
2472 /* If there aren't any relocations, that's OK. */
2476 /* Position ourselves at the start of the section. */
2477 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2480 /* Read the relocations. */
2481 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2484 bed = get_elf_backend_data (abfd);
2486 /* Convert the external relocations to the internal format. */
2487 if (shdr->sh_entsize == sizeof (Elf_External_Rel))
2489 Elf_External_Rel *erel;
2490 Elf_External_Rel *erelend;
2491 Elf_Internal_Rela *irela;
2492 Elf_Internal_Rel *irel;
2494 erel = (Elf_External_Rel *) external_relocs;
2495 erelend = erel + NUM_SHDR_ENTRIES (shdr);
2496 irela = internal_relocs;
2497 amt = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
2498 irel = bfd_alloc (abfd, amt);
2499 for (; erel < erelend; erel++, irela += bed->s->int_rels_per_ext_rel)
2503 if (bed->s->swap_reloc_in)
2504 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
2506 elf_swap_reloc_in (abfd, erel, irel);
2508 for (i = 0; i < bed->s->int_rels_per_ext_rel; ++i)
2510 irela[i].r_offset = irel[i].r_offset;
2511 irela[i].r_info = irel[i].r_info;
2512 irela[i].r_addend = 0;
2518 Elf_External_Rela *erela;
2519 Elf_External_Rela *erelaend;
2520 Elf_Internal_Rela *irela;
2522 BFD_ASSERT (shdr->sh_entsize == sizeof (Elf_External_Rela));
2524 erela = (Elf_External_Rela *) external_relocs;
2525 erelaend = erela + NUM_SHDR_ENTRIES (shdr);
2526 irela = internal_relocs;
2527 for (; erela < erelaend; erela++, irela += bed->s->int_rels_per_ext_rel)
2529 if (bed->s->swap_reloca_in)
2530 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
2532 elf_swap_reloca_in (abfd, erela, irela);
2539 /* Read and swap the relocs for a section O. They may have been
2540 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2541 not NULL, they are used as buffers to read into. They are known to
2542 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2543 the return value is allocated using either malloc or bfd_alloc,
2544 according to the KEEP_MEMORY argument. If O has two relocation
2545 sections (both REL and RELA relocations), then the REL_HDR
2546 relocations will appear first in INTERNAL_RELOCS, followed by the
2547 REL_HDR2 relocations. */
2550 NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
2554 PTR external_relocs;
2555 Elf_Internal_Rela *internal_relocs;
2556 boolean keep_memory;
2558 Elf_Internal_Shdr *rel_hdr;
2560 Elf_Internal_Rela *alloc2 = NULL;
2561 struct elf_backend_data *bed = get_elf_backend_data (abfd);
2563 if (elf_section_data (o)->relocs != NULL)
2564 return elf_section_data (o)->relocs;
2566 if (o->reloc_count == 0)
2569 rel_hdr = &elf_section_data (o)->rel_hdr;
2571 if (internal_relocs == NULL)
2575 size = o->reloc_count;
2576 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2578 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2580 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2581 if (internal_relocs == NULL)
2585 if (external_relocs == NULL)
2587 bfd_size_type size = rel_hdr->sh_size;
2589 if (elf_section_data (o)->rel_hdr2)
2590 size += elf_section_data (o)->rel_hdr2->sh_size;
2591 alloc1 = (PTR) bfd_malloc (size);
2594 external_relocs = alloc1;
2597 if (!elf_link_read_relocs_from_section (abfd, rel_hdr,
2601 if (!elf_link_read_relocs_from_section
2603 elf_section_data (o)->rel_hdr2,
2604 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2605 internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
2606 * bed->s->int_rels_per_ext_rel)))
2609 /* Cache the results for next time, if we can. */
2611 elf_section_data (o)->relocs = internal_relocs;
2616 /* Don't free alloc2, since if it was allocated we are passing it
2617 back (under the name of internal_relocs). */
2619 return internal_relocs;
2629 /* Record an assignment to a symbol made by a linker script. We need
2630 this in case some dynamic object refers to this symbol. */
2633 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
2634 bfd *output_bfd ATTRIBUTE_UNUSED;
2635 struct bfd_link_info *info;
2639 struct elf_link_hash_entry *h;
2641 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2644 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
2648 if (h->root.type == bfd_link_hash_new)
2649 h->elf_link_hash_flags &= ~ELF_LINK_NON_ELF;
2651 /* If this symbol is being provided by the linker script, and it is
2652 currently defined by a dynamic object, but not by a regular
2653 object, then mark it as undefined so that the generic linker will
2654 force the correct value. */
2656 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2657 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2658 h->root.type = bfd_link_hash_undefined;
2660 /* If this symbol is not being provided by the linker script, and it is
2661 currently defined by a dynamic object, but not by a regular object,
2662 then clear out any version information because the symbol will not be
2663 associated with the dynamic object any more. */
2665 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2666 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2667 h->verinfo.verdef = NULL;
2669 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2671 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2672 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
2674 && h->dynindx == -1)
2676 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2679 /* If this is a weak defined symbol, and we know a corresponding
2680 real symbol from the same dynamic object, make sure the real
2681 symbol is also made into a dynamic symbol. */
2682 if (h->weakdef != NULL
2683 && h->weakdef->dynindx == -1)
2685 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2693 /* This structure is used to pass information to
2694 elf_link_assign_sym_version. */
2696 struct elf_assign_sym_version_info
2700 /* General link information. */
2701 struct bfd_link_info *info;
2703 struct bfd_elf_version_tree *verdefs;
2704 /* Whether we had a failure. */
2708 /* This structure is used to pass information to
2709 elf_link_find_version_dependencies. */
2711 struct elf_find_verdep_info
2715 /* General link information. */
2716 struct bfd_link_info *info;
2717 /* The number of dependencies. */
2719 /* Whether we had a failure. */
2723 /* Array used to determine the number of hash table buckets to use
2724 based on the number of symbols there are. If there are fewer than
2725 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2726 fewer than 37 we use 17 buckets, and so forth. We never use more
2727 than 32771 buckets. */
2729 static const size_t elf_buckets[] =
2731 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2735 /* Compute bucket count for hashing table. We do not use a static set
2736 of possible tables sizes anymore. Instead we determine for all
2737 possible reasonable sizes of the table the outcome (i.e., the
2738 number of collisions etc) and choose the best solution. The
2739 weighting functions are not too simple to allow the table to grow
2740 without bounds. Instead one of the weighting factors is the size.
2741 Therefore the result is always a good payoff between few collisions
2742 (= short chain lengths) and table size. */
2744 compute_bucket_count (info)
2745 struct bfd_link_info *info;
2747 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
2748 size_t best_size = 0;
2749 unsigned long int *hashcodes;
2750 unsigned long int *hashcodesp;
2751 unsigned long int i;
2754 /* Compute the hash values for all exported symbols. At the same
2755 time store the values in an array so that we could use them for
2758 amt *= sizeof (unsigned long int);
2759 hashcodes = (unsigned long int *) bfd_malloc (amt);
2760 if (hashcodes == NULL)
2762 hashcodesp = hashcodes;
2764 /* Put all hash values in HASHCODES. */
2765 elf_link_hash_traverse (elf_hash_table (info),
2766 elf_collect_hash_codes, &hashcodesp);
2768 /* We have a problem here. The following code to optimize the table
2769 size requires an integer type with more the 32 bits. If
2770 BFD_HOST_U_64_BIT is set we know about such a type. */
2771 #ifdef BFD_HOST_U_64_BIT
2774 unsigned long int nsyms = hashcodesp - hashcodes;
2777 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
2778 unsigned long int *counts ;
2780 /* Possible optimization parameters: if we have NSYMS symbols we say
2781 that the hashing table must at least have NSYMS/4 and at most
2783 minsize = nsyms / 4;
2786 best_size = maxsize = nsyms * 2;
2788 /* Create array where we count the collisions in. We must use bfd_malloc
2789 since the size could be large. */
2791 amt *= sizeof (unsigned long int);
2792 counts = (unsigned long int *) bfd_malloc (amt);
2799 /* Compute the "optimal" size for the hash table. The criteria is a
2800 minimal chain length. The minor criteria is (of course) the size
2802 for (i = minsize; i < maxsize; ++i)
2804 /* Walk through the array of hashcodes and count the collisions. */
2805 BFD_HOST_U_64_BIT max;
2806 unsigned long int j;
2807 unsigned long int fact;
2809 memset (counts, '\0', i * sizeof (unsigned long int));
2811 /* Determine how often each hash bucket is used. */
2812 for (j = 0; j < nsyms; ++j)
2813 ++counts[hashcodes[j] % i];
2815 /* For the weight function we need some information about the
2816 pagesize on the target. This is information need not be 100%
2817 accurate. Since this information is not available (so far) we
2818 define it here to a reasonable default value. If it is crucial
2819 to have a better value some day simply define this value. */
2820 # ifndef BFD_TARGET_PAGESIZE
2821 # define BFD_TARGET_PAGESIZE (4096)
2824 /* We in any case need 2 + NSYMS entries for the size values and
2826 max = (2 + nsyms) * (ARCH_SIZE / 8);
2829 /* Variant 1: optimize for short chains. We add the squares
2830 of all the chain lengths (which favous many small chain
2831 over a few long chains). */
2832 for (j = 0; j < i; ++j)
2833 max += counts[j] * counts[j];
2835 /* This adds penalties for the overall size of the table. */
2836 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2839 /* Variant 2: Optimize a lot more for small table. Here we
2840 also add squares of the size but we also add penalties for
2841 empty slots (the +1 term). */
2842 for (j = 0; j < i; ++j)
2843 max += (1 + counts[j]) * (1 + counts[j]);
2845 /* The overall size of the table is considered, but not as
2846 strong as in variant 1, where it is squared. */
2847 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2851 /* Compare with current best results. */
2852 if (max < best_chlen)
2862 #endif /* defined (BFD_HOST_U_64_BIT) */
2864 /* This is the fallback solution if no 64bit type is available or if we
2865 are not supposed to spend much time on optimizations. We select the
2866 bucket count using a fixed set of numbers. */
2867 for (i = 0; elf_buckets[i] != 0; i++)
2869 best_size = elf_buckets[i];
2870 if (dynsymcount < elf_buckets[i + 1])
2875 /* Free the arrays we needed. */
2881 /* Set up the sizes and contents of the ELF dynamic sections. This is
2882 called by the ELF linker emulation before_allocation routine. We
2883 must set the sizes of the sections before the linker sets the
2884 addresses of the various sections. */
2887 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
2889 auxiliary_filters, info, sinterpptr,
2894 const char *filter_shlib;
2895 const char * const *auxiliary_filters;
2896 struct bfd_link_info *info;
2897 asection **sinterpptr;
2898 struct bfd_elf_version_tree *verdefs;
2900 bfd_size_type soname_indx;
2902 struct elf_backend_data *bed;
2903 struct elf_assign_sym_version_info asvinfo;
2907 soname_indx = (bfd_size_type) -1;
2909 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2912 if (! is_elf_hash_table (info))
2915 /* Any syms created from now on start with -1 in
2916 got.refcount/offset and plt.refcount/offset. */
2917 elf_hash_table (info)->init_refcount = -1;
2919 /* The backend may have to create some sections regardless of whether
2920 we're dynamic or not. */
2921 bed = get_elf_backend_data (output_bfd);
2922 if (bed->elf_backend_always_size_sections
2923 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
2926 dynobj = elf_hash_table (info)->dynobj;
2928 /* If there were no dynamic objects in the link, there is nothing to
2933 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
2936 if (elf_hash_table (info)->dynamic_sections_created)
2938 struct elf_info_failed eif;
2939 struct elf_link_hash_entry *h;
2941 struct bfd_elf_version_tree *t;
2942 struct bfd_elf_version_expr *d;
2943 boolean all_defined;
2945 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
2946 BFD_ASSERT (*sinterpptr != NULL || info->shared);
2950 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
2952 if (soname_indx == (bfd_size_type) -1
2953 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SONAME,
2960 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMBOLIC,
2963 info->flags |= DF_SYMBOLIC;
2970 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
2972 if (info->new_dtags)
2973 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
2974 if (indx == (bfd_size_type) -1
2975 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_RPATH, indx)
2977 && ! elf_add_dynamic_entry (info, (bfd_vma) DT_RUNPATH,
2982 if (filter_shlib != NULL)
2986 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
2987 filter_shlib, true);
2988 if (indx == (bfd_size_type) -1
2989 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_FILTER, indx))
2993 if (auxiliary_filters != NULL)
2995 const char * const *p;
2997 for (p = auxiliary_filters; *p != NULL; p++)
3001 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3003 if (indx == (bfd_size_type) -1
3004 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_AUXILIARY,
3011 eif.verdefs = verdefs;
3014 /* If we are supposed to export all symbols into the dynamic symbol
3015 table (this is not the normal case), then do so. */
3016 if (info->export_dynamic)
3018 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
3024 /* Make all global versions with definiton. */
3025 for (t = verdefs; t != NULL; t = t->next)
3026 for (d = t->globals; d != NULL; d = d->next)
3027 if (!d->symver && strchr (d->pattern, '*') == NULL)
3029 const char *verstr, *name;
3030 size_t namelen, verlen, newlen;
3032 struct elf_link_hash_entry *newh;
3035 namelen = strlen (name);
3037 verlen = strlen (verstr);
3038 newlen = namelen + verlen + 3;
3040 newname = (char *) bfd_malloc ((bfd_size_type) newlen);
3041 if (newname == NULL)
3043 memcpy (newname, name, namelen);
3045 /* Check the hidden versioned definition. */
3046 p = newname + namelen;
3048 memcpy (p, verstr, verlen + 1);
3049 newh = elf_link_hash_lookup (elf_hash_table (info),
3050 newname, false, false,
3053 || (newh->root.type != bfd_link_hash_defined
3054 && newh->root.type != bfd_link_hash_defweak))
3056 /* Check the default versioned definition. */
3058 memcpy (p, verstr, verlen + 1);
3059 newh = elf_link_hash_lookup (elf_hash_table (info),
3060 newname, false, false,
3065 /* Mark this version if there is a definition. */
3067 && (newh->root.type == bfd_link_hash_defined
3068 || newh->root.type == bfd_link_hash_defweak))
3072 /* Attach all the symbols to their version information. */
3073 asvinfo.output_bfd = output_bfd;
3074 asvinfo.info = info;
3075 asvinfo.verdefs = verdefs;
3076 asvinfo.failed = false;
3078 elf_link_hash_traverse (elf_hash_table (info),
3079 elf_link_assign_sym_version,
3084 if (!info->allow_undefined_version)
3086 /* Check if all global versions have a definiton. */
3088 for (t = verdefs; t != NULL; t = t->next)
3089 for (d = t->globals; d != NULL; d = d->next)
3090 if (!d->symver && !d->script
3091 && strchr (d->pattern, '*') == NULL)
3093 (*_bfd_error_handler)
3094 (_("%s: undefined version: %s"),
3095 d->pattern, t->name);
3096 all_defined = false;
3101 bfd_set_error (bfd_error_bad_value);
3106 /* Find all symbols which were defined in a dynamic object and make
3107 the backend pick a reasonable value for them. */
3108 elf_link_hash_traverse (elf_hash_table (info),
3109 elf_adjust_dynamic_symbol,
3114 /* Add some entries to the .dynamic section. We fill in some of the
3115 values later, in elf_bfd_final_link, but we must add the entries
3116 now so that we know the final size of the .dynamic section. */
3118 /* If there are initialization and/or finalization functions to
3119 call then add the corresponding DT_INIT/DT_FINI entries. */
3120 h = (info->init_function
3121 ? elf_link_hash_lookup (elf_hash_table (info),
3122 info->init_function, false,
3126 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3127 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3129 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_INIT, (bfd_vma) 0))
3132 h = (info->fini_function
3133 ? elf_link_hash_lookup (elf_hash_table (info),
3134 info->fini_function, false,
3138 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3139 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3141 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FINI, (bfd_vma) 0))
3145 if (bfd_get_section_by_name (output_bfd, ".preinit_array") != NULL)
3147 /* DT_PREINIT_ARRAY is not allowed in shared library. */
3153 for (sub = info->input_bfds; sub != NULL;
3154 sub = sub->link_next)
3155 for (o = sub->sections; o != NULL; o = o->next)
3156 if (elf_section_data (o)->this_hdr.sh_type
3157 == SHT_PREINIT_ARRAY)
3159 (*_bfd_error_handler)
3160 (_("%s: .preinit_array section is not allowed in DSO"),
3161 bfd_archive_filename (sub));
3165 bfd_set_error (bfd_error_nonrepresentable_section);
3169 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_PREINIT_ARRAY,
3171 || !elf_add_dynamic_entry (info, (bfd_vma) DT_PREINIT_ARRAYSZ,
3175 if (bfd_get_section_by_name (output_bfd, ".init_array") != NULL)
3177 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_INIT_ARRAY,
3179 || !elf_add_dynamic_entry (info, (bfd_vma) DT_INIT_ARRAYSZ,
3183 if (bfd_get_section_by_name (output_bfd, ".fini_array") != NULL)
3185 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_FINI_ARRAY,
3187 || !elf_add_dynamic_entry (info, (bfd_vma) DT_FINI_ARRAYSZ,
3192 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
3193 /* If .dynstr is excluded from the link, we don't want any of
3194 these tags. Strictly, we should be checking each section
3195 individually; This quick check covers for the case where
3196 someone does a /DISCARD/ : { *(*) }. */
3197 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
3199 bfd_size_type strsize;
3201 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
3202 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_HASH, (bfd_vma) 0)
3203 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_STRTAB, (bfd_vma) 0)
3204 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMTAB, (bfd_vma) 0)
3205 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_STRSZ, strsize)
3206 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMENT,
3207 (bfd_vma) sizeof (Elf_External_Sym)))
3212 /* The backend must work out the sizes of all the other dynamic
3214 if (bed->elf_backend_size_dynamic_sections
3215 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
3218 if (elf_hash_table (info)->dynamic_sections_created)
3220 bfd_size_type dynsymcount;
3222 size_t bucketcount = 0;
3223 size_t hash_entry_size;
3224 unsigned int dtagcount;
3226 /* Set up the version definition section. */
3227 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3228 BFD_ASSERT (s != NULL);
3230 /* We may have created additional version definitions if we are
3231 just linking a regular application. */
3232 verdefs = asvinfo.verdefs;
3234 /* Skip anonymous version tag. */
3235 if (verdefs != NULL && verdefs->vernum == 0)
3236 verdefs = verdefs->next;
3238 if (verdefs == NULL)
3239 _bfd_strip_section_from_output (info, s);
3244 struct bfd_elf_version_tree *t;
3246 Elf_Internal_Verdef def;
3247 Elf_Internal_Verdaux defaux;
3252 /* Make space for the base version. */
3253 size += sizeof (Elf_External_Verdef);
3254 size += sizeof (Elf_External_Verdaux);
3257 for (t = verdefs; t != NULL; t = t->next)
3259 struct bfd_elf_version_deps *n;
3261 size += sizeof (Elf_External_Verdef);
3262 size += sizeof (Elf_External_Verdaux);
3265 for (n = t->deps; n != NULL; n = n->next)
3266 size += sizeof (Elf_External_Verdaux);
3269 s->_raw_size = size;
3270 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3271 if (s->contents == NULL && s->_raw_size != 0)
3274 /* Fill in the version definition section. */
3278 def.vd_version = VER_DEF_CURRENT;
3279 def.vd_flags = VER_FLG_BASE;
3282 def.vd_aux = sizeof (Elf_External_Verdef);
3283 def.vd_next = (sizeof (Elf_External_Verdef)
3284 + sizeof (Elf_External_Verdaux));
3286 if (soname_indx != (bfd_size_type) -1)
3288 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3290 def.vd_hash = bfd_elf_hash (soname);
3291 defaux.vda_name = soname_indx;
3298 name = basename (output_bfd->filename);
3299 def.vd_hash = bfd_elf_hash (name);
3300 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3302 if (indx == (bfd_size_type) -1)
3304 defaux.vda_name = indx;
3306 defaux.vda_next = 0;
3308 _bfd_elf_swap_verdef_out (output_bfd, &def,
3309 (Elf_External_Verdef *) p);
3310 p += sizeof (Elf_External_Verdef);
3311 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3312 (Elf_External_Verdaux *) p);
3313 p += sizeof (Elf_External_Verdaux);
3315 for (t = verdefs; t != NULL; t = t->next)
3318 struct bfd_elf_version_deps *n;
3319 struct elf_link_hash_entry *h;
3322 for (n = t->deps; n != NULL; n = n->next)
3325 /* Add a symbol representing this version. */
3327 if (! (_bfd_generic_link_add_one_symbol
3328 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
3329 (bfd_vma) 0, (const char *) NULL, false,
3330 get_elf_backend_data (dynobj)->collect,
3331 (struct bfd_link_hash_entry **) &h)))
3333 h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
3334 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3335 h->type = STT_OBJECT;
3336 h->verinfo.vertree = t;
3338 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
3341 def.vd_version = VER_DEF_CURRENT;
3343 if (t->globals == NULL && t->locals == NULL && ! t->used)
3344 def.vd_flags |= VER_FLG_WEAK;
3345 def.vd_ndx = t->vernum + 1;
3346 def.vd_cnt = cdeps + 1;
3347 def.vd_hash = bfd_elf_hash (t->name);
3348 def.vd_aux = sizeof (Elf_External_Verdef);
3349 if (t->next != NULL)
3350 def.vd_next = (sizeof (Elf_External_Verdef)
3351 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
3355 _bfd_elf_swap_verdef_out (output_bfd, &def,
3356 (Elf_External_Verdef *) p);
3357 p += sizeof (Elf_External_Verdef);
3359 defaux.vda_name = h->dynstr_index;
3360 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3362 if (t->deps == NULL)
3363 defaux.vda_next = 0;
3365 defaux.vda_next = sizeof (Elf_External_Verdaux);
3366 t->name_indx = defaux.vda_name;
3368 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3369 (Elf_External_Verdaux *) p);
3370 p += sizeof (Elf_External_Verdaux);
3372 for (n = t->deps; n != NULL; n = n->next)
3374 if (n->version_needed == NULL)
3376 /* This can happen if there was an error in the
3378 defaux.vda_name = 0;
3382 defaux.vda_name = n->version_needed->name_indx;
3383 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3386 if (n->next == NULL)
3387 defaux.vda_next = 0;
3389 defaux.vda_next = sizeof (Elf_External_Verdaux);
3391 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3392 (Elf_External_Verdaux *) p);
3393 p += sizeof (Elf_External_Verdaux);
3397 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERDEF, (bfd_vma) 0)
3398 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_VERDEFNUM,
3402 elf_tdata (output_bfd)->cverdefs = cdefs;
3405 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
3407 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FLAGS, info->flags))
3414 info->flags_1 &= ~ (DF_1_INITFIRST
3417 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FLAGS_1,
3422 /* Work out the size of the version reference section. */
3424 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3425 BFD_ASSERT (s != NULL);
3427 struct elf_find_verdep_info sinfo;
3429 sinfo.output_bfd = output_bfd;
3431 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
3432 if (sinfo.vers == 0)
3434 sinfo.failed = false;
3436 elf_link_hash_traverse (elf_hash_table (info),
3437 elf_link_find_version_dependencies,
3440 if (elf_tdata (output_bfd)->verref == NULL)
3441 _bfd_strip_section_from_output (info, s);
3444 Elf_Internal_Verneed *t;
3449 /* Build the version definition section. */
3452 for (t = elf_tdata (output_bfd)->verref;
3456 Elf_Internal_Vernaux *a;
3458 size += sizeof (Elf_External_Verneed);
3460 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3461 size += sizeof (Elf_External_Vernaux);
3464 s->_raw_size = size;
3465 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3466 if (s->contents == NULL)
3470 for (t = elf_tdata (output_bfd)->verref;
3475 Elf_Internal_Vernaux *a;
3479 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3482 t->vn_version = VER_NEED_CURRENT;
3484 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3485 elf_dt_name (t->vn_bfd) != NULL
3486 ? elf_dt_name (t->vn_bfd)
3487 : basename (t->vn_bfd->filename),
3489 if (indx == (bfd_size_type) -1)
3492 t->vn_aux = sizeof (Elf_External_Verneed);
3493 if (t->vn_nextref == NULL)
3496 t->vn_next = (sizeof (Elf_External_Verneed)
3497 + caux * sizeof (Elf_External_Vernaux));
3499 _bfd_elf_swap_verneed_out (output_bfd, t,
3500 (Elf_External_Verneed *) p);
3501 p += sizeof (Elf_External_Verneed);
3503 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3505 a->vna_hash = bfd_elf_hash (a->vna_nodename);
3506 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3507 a->vna_nodename, false);
3508 if (indx == (bfd_size_type) -1)
3511 if (a->vna_nextptr == NULL)
3514 a->vna_next = sizeof (Elf_External_Vernaux);
3516 _bfd_elf_swap_vernaux_out (output_bfd, a,
3517 (Elf_External_Vernaux *) p);
3518 p += sizeof (Elf_External_Vernaux);
3522 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERNEED,
3524 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_VERNEEDNUM,
3528 elf_tdata (output_bfd)->cverrefs = crefs;
3532 /* Assign dynsym indicies. In a shared library we generate a
3533 section symbol for each output section, which come first.
3534 Next come all of the back-end allocated local dynamic syms,
3535 followed by the rest of the global symbols. */
3537 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3539 /* Work out the size of the symbol version section. */
3540 s = bfd_get_section_by_name (dynobj, ".gnu.version");
3541 BFD_ASSERT (s != NULL);
3542 if (dynsymcount == 0
3543 || (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
3545 _bfd_strip_section_from_output (info, s);
3546 /* The DYNSYMCOUNT might have changed if we were going to
3547 output a dynamic symbol table entry for S. */
3548 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3552 s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
3553 s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3554 if (s->contents == NULL)
3557 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERSYM, (bfd_vma) 0))
3561 /* Set the size of the .dynsym and .hash sections. We counted
3562 the number of dynamic symbols in elf_link_add_object_symbols.
3563 We will build the contents of .dynsym and .hash when we build
3564 the final symbol table, because until then we do not know the
3565 correct value to give the symbols. We built the .dynstr
3566 section as we went along in elf_link_add_object_symbols. */
3567 s = bfd_get_section_by_name (dynobj, ".dynsym");
3568 BFD_ASSERT (s != NULL);
3569 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
3570 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3571 if (s->contents == NULL && s->_raw_size != 0)
3574 if (dynsymcount != 0)
3576 Elf_Internal_Sym isym;
3578 /* The first entry in .dynsym is a dummy symbol. */
3585 elf_swap_symbol_out (output_bfd, &isym, (PTR) s->contents, (PTR) 0);
3588 /* Compute the size of the hashing table. As a side effect this
3589 computes the hash values for all the names we export. */
3590 bucketcount = compute_bucket_count (info);
3592 s = bfd_get_section_by_name (dynobj, ".hash");
3593 BFD_ASSERT (s != NULL);
3594 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
3595 s->_raw_size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
3596 s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3597 if (s->contents == NULL)
3600 bfd_put (8 * hash_entry_size, output_bfd, (bfd_vma) bucketcount,
3602 bfd_put (8 * hash_entry_size, output_bfd, (bfd_vma) dynsymcount,
3603 s->contents + hash_entry_size);
3605 elf_hash_table (info)->bucketcount = bucketcount;
3607 s = bfd_get_section_by_name (dynobj, ".dynstr");
3608 BFD_ASSERT (s != NULL);
3610 elf_finalize_dynstr (output_bfd, info);
3612 s->_raw_size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
3614 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
3615 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NULL, (bfd_vma) 0))
3622 /* This function is used to adjust offsets into .dynstr for
3623 dynamic symbols. This is called via elf_link_hash_traverse. */
3625 static boolean elf_adjust_dynstr_offsets
3626 PARAMS ((struct elf_link_hash_entry *, PTR));
3629 elf_adjust_dynstr_offsets (h, data)
3630 struct elf_link_hash_entry *h;
3633 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3635 if (h->root.type == bfd_link_hash_warning)
3636 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3638 if (h->dynindx != -1)
3639 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3643 /* Assign string offsets in .dynstr, update all structures referencing
3647 elf_finalize_dynstr (output_bfd, info)
3649 struct bfd_link_info *info;
3651 struct elf_link_local_dynamic_entry *entry;
3652 struct elf_strtab_hash *dynstr = elf_hash_table (info)->dynstr;
3653 bfd *dynobj = elf_hash_table (info)->dynobj;
3656 Elf_External_Dyn *dyncon, *dynconend;
3658 _bfd_elf_strtab_finalize (dynstr);
3659 size = _bfd_elf_strtab_size (dynstr);
3661 /* Update all .dynamic entries referencing .dynstr strings. */
3662 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3663 BFD_ASSERT (sdyn != NULL);
3665 dyncon = (Elf_External_Dyn *) sdyn->contents;
3666 dynconend = (Elf_External_Dyn *) (sdyn->contents +
3668 for (; dyncon < dynconend; dyncon++)
3670 Elf_Internal_Dyn dyn;
3672 elf_swap_dyn_in (dynobj, dyncon, & dyn);
3676 dyn.d_un.d_val = size;
3677 elf_swap_dyn_out (dynobj, & dyn, dyncon);
3685 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3686 elf_swap_dyn_out (dynobj, & dyn, dyncon);
3693 /* Now update local dynamic symbols. */
3694 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
3695 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3696 entry->isym.st_name);
3698 /* And the rest of dynamic symbols. */
3699 elf_link_hash_traverse (elf_hash_table (info),
3700 elf_adjust_dynstr_offsets, dynstr);
3702 /* Adjust version definitions. */
3703 if (elf_tdata (output_bfd)->cverdefs)
3708 Elf_Internal_Verdef def;
3709 Elf_Internal_Verdaux defaux;
3711 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3712 p = (bfd_byte *) s->contents;
3715 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3717 p += sizeof (Elf_External_Verdef);
3718 for (i = 0; i < def.vd_cnt; ++i)
3720 _bfd_elf_swap_verdaux_in (output_bfd,
3721 (Elf_External_Verdaux *) p, &defaux);
3722 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3724 _bfd_elf_swap_verdaux_out (output_bfd,
3725 &defaux, (Elf_External_Verdaux *) p);
3726 p += sizeof (Elf_External_Verdaux);
3729 while (def.vd_next);
3732 /* Adjust version references. */
3733 if (elf_tdata (output_bfd)->verref)
3738 Elf_Internal_Verneed need;
3739 Elf_Internal_Vernaux needaux;
3741 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3742 p = (bfd_byte *) s->contents;
3745 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3747 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3748 _bfd_elf_swap_verneed_out (output_bfd, &need,
3749 (Elf_External_Verneed *) p);
3750 p += sizeof (Elf_External_Verneed);
3751 for (i = 0; i < need.vn_cnt; ++i)
3753 _bfd_elf_swap_vernaux_in (output_bfd,
3754 (Elf_External_Vernaux *) p, &needaux);
3755 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3757 _bfd_elf_swap_vernaux_out (output_bfd,
3759 (Elf_External_Vernaux *) p);
3760 p += sizeof (Elf_External_Vernaux);
3763 while (need.vn_next);
3769 /* Fix up the flags for a symbol. This handles various cases which
3770 can only be fixed after all the input files are seen. This is
3771 currently called by both adjust_dynamic_symbol and
3772 assign_sym_version, which is unnecessary but perhaps more robust in
3773 the face of future changes. */
3776 elf_fix_symbol_flags (h, eif)
3777 struct elf_link_hash_entry *h;
3778 struct elf_info_failed *eif;
3780 /* If this symbol was mentioned in a non-ELF file, try to set
3781 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3782 permit a non-ELF file to correctly refer to a symbol defined in
3783 an ELF dynamic object. */
3784 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
3786 while (h->root.type == bfd_link_hash_indirect)
3787 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3789 if (h->root.type != bfd_link_hash_defined
3790 && h->root.type != bfd_link_hash_defweak)
3791 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3792 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3795 if (h->root.u.def.section->owner != NULL
3796 && (bfd_get_flavour (h->root.u.def.section->owner)
3797 == bfd_target_elf_flavour))
3798 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3799 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3801 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3804 if (h->dynindx == -1
3805 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3806 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
3808 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3817 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3818 was first seen in a non-ELF file. Fortunately, if the symbol
3819 was first seen in an ELF file, we're probably OK unless the
3820 symbol was defined in a non-ELF file. Catch that case here.
3821 FIXME: We're still in trouble if the symbol was first seen in
3822 a dynamic object, and then later in a non-ELF regular object. */
3823 if ((h->root.type == bfd_link_hash_defined
3824 || h->root.type == bfd_link_hash_defweak)
3825 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3826 && (h->root.u.def.section->owner != NULL
3827 ? (bfd_get_flavour (h->root.u.def.section->owner)
3828 != bfd_target_elf_flavour)
3829 : (bfd_is_abs_section (h->root.u.def.section)
3830 && (h->elf_link_hash_flags
3831 & ELF_LINK_HASH_DEF_DYNAMIC) == 0)))
3832 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3835 /* If this is a final link, and the symbol was defined as a common
3836 symbol in a regular object file, and there was no definition in
3837 any dynamic object, then the linker will have allocated space for
3838 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3839 flag will not have been set. */
3840 if (h->root.type == bfd_link_hash_defined
3841 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3842 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
3843 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3844 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
3845 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3847 /* If -Bsymbolic was used (which means to bind references to global
3848 symbols to the definition within the shared object), and this
3849 symbol was defined in a regular object, then it actually doesn't
3850 need a PLT entry, and we can accomplish that by forcing it local.
3851 Likewise, if the symbol has hidden or internal visibility.
3852 FIXME: It might be that we also do not need a PLT for other
3853 non-hidden visibilities, but we would have to tell that to the
3854 backend specifically; we can't just clear PLT-related data here. */
3855 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
3856 && eif->info->shared
3857 && is_elf_hash_table (eif->info)
3858 && (eif->info->symbolic
3859 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3860 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
3861 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3863 struct elf_backend_data *bed;
3864 boolean force_local;
3866 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3868 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3869 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
3870 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
3873 /* If this is a weak defined symbol in a dynamic object, and we know
3874 the real definition in the dynamic object, copy interesting flags
3875 over to the real definition. */
3876 if (h->weakdef != NULL)
3878 struct elf_link_hash_entry *weakdef;
3880 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3881 || h->root.type == bfd_link_hash_defweak);
3882 weakdef = h->weakdef;
3883 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
3884 || weakdef->root.type == bfd_link_hash_defweak);
3885 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
3887 /* If the real definition is defined by a regular object file,
3888 don't do anything special. See the longer description in
3889 elf_adjust_dynamic_symbol, below. */
3890 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3894 struct elf_backend_data *bed;
3896 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3897 (*bed->elf_backend_copy_indirect_symbol) (weakdef, h);
3904 /* Make the backend pick a good value for a dynamic symbol. This is
3905 called via elf_link_hash_traverse, and also calls itself
3909 elf_adjust_dynamic_symbol (h, data)
3910 struct elf_link_hash_entry *h;
3913 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3915 struct elf_backend_data *bed;
3917 if (h->root.type == bfd_link_hash_warning)
3919 h->plt.offset = (bfd_vma) -1;
3920 h->got.offset = (bfd_vma) -1;
3922 /* When warning symbols are created, they **replace** the "real"
3923 entry in the hash table, thus we never get to see the real
3924 symbol in a hash traversal. So look at it now. */
3925 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3928 /* Ignore indirect symbols. These are added by the versioning code. */
3929 if (h->root.type == bfd_link_hash_indirect)
3932 if (! is_elf_hash_table (eif->info))
3935 /* Fix the symbol flags. */
3936 if (! elf_fix_symbol_flags (h, eif))
3939 /* If this symbol does not require a PLT entry, and it is not
3940 defined by a dynamic object, or is not referenced by a regular
3941 object, ignore it. We do have to handle a weak defined symbol,
3942 even if no regular object refers to it, if we decided to add it
3943 to the dynamic symbol table. FIXME: Do we normally need to worry
3944 about symbols which are defined by one dynamic object and
3945 referenced by another one? */
3946 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
3947 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3948 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3949 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
3950 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
3952 h->plt.offset = (bfd_vma) -1;
3956 /* If we've already adjusted this symbol, don't do it again. This
3957 can happen via a recursive call. */
3958 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
3961 /* Don't look at this symbol again. Note that we must set this
3962 after checking the above conditions, because we may look at a
3963 symbol once, decide not to do anything, and then get called
3964 recursively later after REF_REGULAR is set below. */
3965 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
3967 /* If this is a weak definition, and we know a real definition, and
3968 the real symbol is not itself defined by a regular object file,
3969 then get a good value for the real definition. We handle the
3970 real symbol first, for the convenience of the backend routine.
3972 Note that there is a confusing case here. If the real definition
3973 is defined by a regular object file, we don't get the real symbol
3974 from the dynamic object, but we do get the weak symbol. If the
3975 processor backend uses a COPY reloc, then if some routine in the
3976 dynamic object changes the real symbol, we will not see that
3977 change in the corresponding weak symbol. This is the way other
3978 ELF linkers work as well, and seems to be a result of the shared
3981 I will clarify this issue. Most SVR4 shared libraries define the
3982 variable _timezone and define timezone as a weak synonym. The
3983 tzset call changes _timezone. If you write
3984 extern int timezone;
3986 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3987 you might expect that, since timezone is a synonym for _timezone,
3988 the same number will print both times. However, if the processor
3989 backend uses a COPY reloc, then actually timezone will be copied
3990 into your process image, and, since you define _timezone
3991 yourself, _timezone will not. Thus timezone and _timezone will
3992 wind up at different memory locations. The tzset call will set
3993 _timezone, leaving timezone unchanged. */
3995 if (h->weakdef != NULL)
3997 /* If we get to this point, we know there is an implicit
3998 reference by a regular object file via the weak symbol H.
3999 FIXME: Is this really true? What if the traversal finds
4000 H->WEAKDEF before it finds H? */
4001 h->weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
4003 if (! elf_adjust_dynamic_symbol (h->weakdef, (PTR) eif))
4007 /* If a symbol has no type and no size and does not require a PLT
4008 entry, then we are probably about to do the wrong thing here: we
4009 are probably going to create a COPY reloc for an empty object.
4010 This case can arise when a shared object is built with assembly
4011 code, and the assembly code fails to set the symbol type. */
4013 && h->type == STT_NOTYPE
4014 && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0)
4015 (*_bfd_error_handler)
4016 (_("warning: type and size of dynamic symbol `%s' are not defined"),
4017 h->root.root.string);
4019 dynobj = elf_hash_table (eif->info)->dynobj;
4020 bed = get_elf_backend_data (dynobj);
4021 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
4030 /* This routine is used to export all defined symbols into the dynamic
4031 symbol table. It is called via elf_link_hash_traverse. */
4034 elf_export_symbol (h, data)
4035 struct elf_link_hash_entry *h;
4038 struct elf_info_failed *eif = (struct elf_info_failed *) data;
4040 /* Ignore indirect symbols. These are added by the versioning code. */
4041 if (h->root.type == bfd_link_hash_indirect)
4044 if (h->root.type == bfd_link_hash_warning)
4045 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4047 if (h->dynindx == -1
4048 && (h->elf_link_hash_flags
4049 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
4051 struct bfd_elf_version_tree *t;
4052 struct bfd_elf_version_expr *d;
4054 for (t = eif->verdefs; t != NULL; t = t->next)
4056 if (t->globals != NULL)
4058 for (d = t->globals; d != NULL; d = d->next)
4060 if ((*d->match) (d, h->root.root.string))
4065 if (t->locals != NULL)
4067 for (d = t->locals ; d != NULL; d = d->next)
4069 if ((*d->match) (d, h->root.root.string))
4078 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
4089 /* Look through the symbols which are defined in other shared
4090 libraries and referenced here. Update the list of version
4091 dependencies. This will be put into the .gnu.version_r section.
4092 This function is called via elf_link_hash_traverse. */
4095 elf_link_find_version_dependencies (h, data)
4096 struct elf_link_hash_entry *h;
4099 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
4100 Elf_Internal_Verneed *t;
4101 Elf_Internal_Vernaux *a;
4104 if (h->root.type == bfd_link_hash_warning)
4105 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4107 /* We only care about symbols defined in shared objects with version
4109 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
4110 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
4112 || h->verinfo.verdef == NULL)
4115 /* See if we already know about this version. */
4116 for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
4118 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
4121 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4122 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
4128 /* This is a new version. Add it to tree we are building. */
4133 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, amt);
4136 rinfo->failed = true;
4140 t->vn_bfd = h->verinfo.verdef->vd_bfd;
4141 t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
4142 elf_tdata (rinfo->output_bfd)->verref = t;
4146 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, amt);
4148 /* Note that we are copying a string pointer here, and testing it
4149 above. If bfd_elf_string_from_elf_section is ever changed to
4150 discard the string data when low in memory, this will have to be
4152 a->vna_nodename = h->verinfo.verdef->vd_nodename;
4154 a->vna_flags = h->verinfo.verdef->vd_flags;
4155 a->vna_nextptr = t->vn_auxptr;
4157 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
4160 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
4167 /* Figure out appropriate versions for all the symbols. We may not
4168 have the version number script until we have read all of the input
4169 files, so until that point we don't know which symbols should be
4170 local. This function is called via elf_link_hash_traverse. */
4173 elf_link_assign_sym_version (h, data)
4174 struct elf_link_hash_entry *h;
4177 struct elf_assign_sym_version_info *sinfo;
4178 struct bfd_link_info *info;
4179 struct elf_backend_data *bed;
4180 struct elf_info_failed eif;
4184 sinfo = (struct elf_assign_sym_version_info *) data;
4187 if (h->root.type == bfd_link_hash_warning)
4188 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4190 /* Fix the symbol flags. */
4193 if (! elf_fix_symbol_flags (h, &eif))
4196 sinfo->failed = true;
4200 /* We only need version numbers for symbols defined in regular
4202 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
4205 bed = get_elf_backend_data (sinfo->output_bfd);
4206 p = strchr (h->root.root.string, ELF_VER_CHR);
4207 if (p != NULL && h->verinfo.vertree == NULL)
4209 struct bfd_elf_version_tree *t;
4214 /* There are two consecutive ELF_VER_CHR characters if this is
4215 not a hidden symbol. */
4217 if (*p == ELF_VER_CHR)
4223 /* If there is no version string, we can just return out. */
4227 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
4231 /* Look for the version. If we find it, it is no longer weak. */
4232 for (t = sinfo->verdefs; t != NULL; t = t->next)
4234 if (strcmp (t->name, p) == 0)
4238 struct bfd_elf_version_expr *d;
4240 len = p - h->root.root.string;
4241 alc = bfd_malloc ((bfd_size_type) len);
4244 memcpy (alc, h->root.root.string, len - 1);
4245 alc[len - 1] = '\0';
4246 if (alc[len - 2] == ELF_VER_CHR)
4247 alc[len - 2] = '\0';
4249 h->verinfo.vertree = t;
4253 if (t->globals != NULL)
4255 for (d = t->globals; d != NULL; d = d->next)
4256 if ((*d->match) (d, alc))
4260 /* See if there is anything to force this symbol to
4262 if (d == NULL && t->locals != NULL)
4264 for (d = t->locals; d != NULL; d = d->next)
4266 if ((*d->match) (d, alc))
4268 if (h->dynindx != -1
4270 && ! info->export_dynamic)
4272 (*bed->elf_backend_hide_symbol) (info, h, true);
4285 /* If we are building an application, we need to create a
4286 version node for this version. */
4287 if (t == NULL && ! info->shared)
4289 struct bfd_elf_version_tree **pp;
4292 /* If we aren't going to export this symbol, we don't need
4293 to worry about it. */
4294 if (h->dynindx == -1)
4298 t = ((struct bfd_elf_version_tree *)
4299 bfd_alloc (sinfo->output_bfd, amt));
4302 sinfo->failed = true;
4311 t->name_indx = (unsigned int) -1;
4315 /* Don't count anonymous version tag. */
4316 if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0)
4318 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
4320 t->vernum = version_index;
4324 h->verinfo.vertree = t;
4328 /* We could not find the version for a symbol when
4329 generating a shared archive. Return an error. */
4330 (*_bfd_error_handler)
4331 (_("%s: undefined versioned symbol name %s"),
4332 bfd_get_filename (sinfo->output_bfd), h->root.root.string);
4333 bfd_set_error (bfd_error_bad_value);
4334 sinfo->failed = true;
4339 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
4342 /* If we don't have a version for this symbol, see if we can find
4344 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
4346 struct bfd_elf_version_tree *t;
4347 struct bfd_elf_version_tree *local_ver;
4348 struct bfd_elf_version_expr *d;
4350 /* See if can find what version this symbol is in. If the
4351 symbol is supposed to be local, then don't actually register
4354 for (t = sinfo->verdefs; t != NULL; t = t->next)
4356 if (t->globals != NULL)
4361 for (d = t->globals; d != NULL; d = d->next)
4363 if ((*d->match) (d, h->root.root.string))
4369 /* There is a version without definition. Make
4370 the symbol the default definition for this
4372 h->verinfo.vertree = t;
4383 /* There is no undefined version for this symbol. Hide the
4385 (*bed->elf_backend_hide_symbol) (info, h, true);
4388 if (t->locals != NULL)
4390 for (d = t->locals; d != NULL; d = d->next)
4392 /* If the match is "*", keep looking for a more
4393 explicit, perhaps even global, match. */
4394 if (d->pattern[0] == '*' && d->pattern[1] == '\0')
4396 else if ((*d->match) (d, h->root.root.string))
4408 if (local_ver != NULL)
4410 h->verinfo.vertree = local_ver;
4411 if (h->dynindx != -1
4413 && ! info->export_dynamic)
4415 (*bed->elf_backend_hide_symbol) (info, h, true);
4423 /* Final phase of ELF linker. */
4425 /* A structure we use to avoid passing large numbers of arguments. */
4427 struct elf_final_link_info
4429 /* General link information. */
4430 struct bfd_link_info *info;
4433 /* Symbol string table. */
4434 struct bfd_strtab_hash *symstrtab;
4435 /* .dynsym section. */
4436 asection *dynsym_sec;
4437 /* .hash section. */
4439 /* symbol version section (.gnu.version). */
4440 asection *symver_sec;
4441 /* first SHF_TLS section (if any). */
4442 asection *first_tls_sec;
4443 /* Buffer large enough to hold contents of any section. */
4445 /* Buffer large enough to hold external relocs of any section. */
4446 PTR external_relocs;
4447 /* Buffer large enough to hold internal relocs of any section. */
4448 Elf_Internal_Rela *internal_relocs;
4449 /* Buffer large enough to hold external local symbols of any input
4451 Elf_External_Sym *external_syms;
4452 /* And a buffer for symbol section indices. */
4453 Elf_External_Sym_Shndx *locsym_shndx;
4454 /* Buffer large enough to hold internal local symbols of any input
4456 Elf_Internal_Sym *internal_syms;
4457 /* Array large enough to hold a symbol index for each local symbol
4458 of any input BFD. */
4460 /* Array large enough to hold a section pointer for each local
4461 symbol of any input BFD. */
4462 asection **sections;
4463 /* Buffer to hold swapped out symbols. */
4464 Elf_External_Sym *symbuf;
4465 /* And one for symbol section indices. */
4466 Elf_External_Sym_Shndx *symshndxbuf;
4467 /* Number of swapped out symbols in buffer. */
4468 size_t symbuf_count;
4469 /* Number of symbols which fit in symbuf. */
4473 static boolean elf_link_output_sym
4474 PARAMS ((struct elf_final_link_info *, const char *,
4475 Elf_Internal_Sym *, asection *));
4476 static boolean elf_link_flush_output_syms
4477 PARAMS ((struct elf_final_link_info *));
4478 static boolean elf_link_output_extsym
4479 PARAMS ((struct elf_link_hash_entry *, PTR));
4480 static boolean elf_link_sec_merge_syms
4481 PARAMS ((struct elf_link_hash_entry *, PTR));
4482 static boolean elf_link_check_versioned_symbol
4483 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
4484 static boolean elf_link_input_bfd
4485 PARAMS ((struct elf_final_link_info *, bfd *));
4486 static boolean elf_reloc_link_order
4487 PARAMS ((bfd *, struct bfd_link_info *, asection *,
4488 struct bfd_link_order *));
4490 /* This struct is used to pass information to elf_link_output_extsym. */
4492 struct elf_outext_info
4496 struct elf_final_link_info *finfo;
4499 /* Compute the size of, and allocate space for, REL_HDR which is the
4500 section header for a section containing relocations for O. */
4503 elf_link_size_reloc_section (abfd, rel_hdr, o)
4505 Elf_Internal_Shdr *rel_hdr;
4508 bfd_size_type reloc_count;
4509 bfd_size_type num_rel_hashes;
4511 /* Figure out how many relocations there will be. */
4512 if (rel_hdr == &elf_section_data (o)->rel_hdr)
4513 reloc_count = elf_section_data (o)->rel_count;
4515 reloc_count = elf_section_data (o)->rel_count2;
4517 num_rel_hashes = o->reloc_count;
4518 if (num_rel_hashes < reloc_count)
4519 num_rel_hashes = reloc_count;
4521 /* That allows us to calculate the size of the section. */
4522 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
4524 /* The contents field must last into write_object_contents, so we
4525 allocate it with bfd_alloc rather than malloc. Also since we
4526 cannot be sure that the contents will actually be filled in,
4527 we zero the allocated space. */
4528 rel_hdr->contents = (PTR) bfd_zalloc (abfd, rel_hdr->sh_size);
4529 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
4532 /* We only allocate one set of hash entries, so we only do it the
4533 first time we are called. */
4534 if (elf_section_data (o)->rel_hashes == NULL
4537 struct elf_link_hash_entry **p;
4539 p = ((struct elf_link_hash_entry **)
4540 bfd_zmalloc (num_rel_hashes
4541 * sizeof (struct elf_link_hash_entry *)));
4545 elf_section_data (o)->rel_hashes = p;
4551 /* When performing a relocateable link, the input relocations are
4552 preserved. But, if they reference global symbols, the indices
4553 referenced must be updated. Update all the relocations in
4554 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4557 elf_link_adjust_relocs (abfd, rel_hdr, count, rel_hash)
4559 Elf_Internal_Shdr *rel_hdr;
4561 struct elf_link_hash_entry **rel_hash;
4564 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4565 Elf_Internal_Rel *irel;
4566 Elf_Internal_Rela *irela;
4567 bfd_size_type amt = sizeof (Elf_Internal_Rel) * bed->s->int_rels_per_ext_rel;
4569 irel = (Elf_Internal_Rel *) bfd_zmalloc (amt);
4572 (*_bfd_error_handler) (_("Error: out of memory"));
4576 amt = sizeof (Elf_Internal_Rela) * bed->s->int_rels_per_ext_rel;
4577 irela = (Elf_Internal_Rela *) bfd_zmalloc (amt);
4580 (*_bfd_error_handler) (_("Error: out of memory"));
4584 for (i = 0; i < count; i++, rel_hash++)
4586 if (*rel_hash == NULL)
4589 BFD_ASSERT ((*rel_hash)->indx >= 0);
4591 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
4593 Elf_External_Rel *erel;
4596 erel = (Elf_External_Rel *) rel_hdr->contents + i;
4597 if (bed->s->swap_reloc_in)
4598 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
4600 elf_swap_reloc_in (abfd, erel, irel);
4602 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4603 irel[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4604 ELF_R_TYPE (irel[j].r_info));
4606 if (bed->s->swap_reloc_out)
4607 (*bed->s->swap_reloc_out) (abfd, irel, (bfd_byte *) erel);
4609 elf_swap_reloc_out (abfd, irel, erel);
4613 Elf_External_Rela *erela;
4616 BFD_ASSERT (rel_hdr->sh_entsize
4617 == sizeof (Elf_External_Rela));
4619 erela = (Elf_External_Rela *) rel_hdr->contents + i;
4620 if (bed->s->swap_reloca_in)
4621 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
4623 elf_swap_reloca_in (abfd, erela, irela);
4625 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4626 irela[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4627 ELF_R_TYPE (irela[j].r_info));
4629 if (bed->s->swap_reloca_out)
4630 (*bed->s->swap_reloca_out) (abfd, irela, (bfd_byte *) erela);
4632 elf_swap_reloca_out (abfd, irela, erela);
4640 struct elf_link_sort_rela
4643 enum elf_reloc_type_class type;
4646 Elf_Internal_Rel rel;
4647 Elf_Internal_Rela rela;
4652 elf_link_sort_cmp1 (A, B)
4656 struct elf_link_sort_rela *a = (struct elf_link_sort_rela *) A;
4657 struct elf_link_sort_rela *b = (struct elf_link_sort_rela *) B;
4658 int relativea, relativeb;
4660 relativea = a->type == reloc_class_relative;
4661 relativeb = b->type == reloc_class_relative;
4663 if (relativea < relativeb)
4665 if (relativea > relativeb)
4667 if (ELF_R_SYM (a->u.rel.r_info) < ELF_R_SYM (b->u.rel.r_info))
4669 if (ELF_R_SYM (a->u.rel.r_info) > ELF_R_SYM (b->u.rel.r_info))
4671 if (a->u.rel.r_offset < b->u.rel.r_offset)
4673 if (a->u.rel.r_offset > b->u.rel.r_offset)
4679 elf_link_sort_cmp2 (A, B)
4683 struct elf_link_sort_rela *a = (struct elf_link_sort_rela *) A;
4684 struct elf_link_sort_rela *b = (struct elf_link_sort_rela *) B;
4687 if (a->offset < b->offset)
4689 if (a->offset > b->offset)
4691 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
4692 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
4697 if (a->u.rel.r_offset < b->u.rel.r_offset)
4699 if (a->u.rel.r_offset > b->u.rel.r_offset)
4705 elf_link_sort_relocs (abfd, info, psec)
4707 struct bfd_link_info *info;
4710 bfd *dynobj = elf_hash_table (info)->dynobj;
4711 asection *reldyn, *o;
4712 boolean rel = false;
4713 bfd_size_type count, size;
4715 struct elf_link_sort_rela *rela;
4716 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4718 reldyn = bfd_get_section_by_name (abfd, ".rela.dyn");
4719 if (reldyn == NULL || reldyn->_raw_size == 0)
4721 reldyn = bfd_get_section_by_name (abfd, ".rel.dyn");
4722 if (reldyn == NULL || reldyn->_raw_size == 0)
4725 count = reldyn->_raw_size / sizeof (Elf_External_Rel);
4728 count = reldyn->_raw_size / sizeof (Elf_External_Rela);
4731 for (o = dynobj->sections; o != NULL; o = o->next)
4732 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4733 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4734 && o->output_section == reldyn)
4735 size += o->_raw_size;
4737 if (size != reldyn->_raw_size)
4740 rela = (struct elf_link_sort_rela *) bfd_zmalloc (sizeof (*rela) * count);
4743 (*info->callbacks->warning)
4744 (info, _("Not enough memory to sort relocations"), 0, abfd, 0,
4749 for (o = dynobj->sections; o != NULL; o = o->next)
4750 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4751 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4752 && o->output_section == reldyn)
4756 Elf_External_Rel *erel, *erelend;
4757 struct elf_link_sort_rela *s;
4759 erel = (Elf_External_Rel *) o->contents;
4760 erelend = (Elf_External_Rel *) (o->contents + o->_raw_size);
4761 s = rela + o->output_offset / sizeof (Elf_External_Rel);
4762 for (; erel < erelend; erel++, s++)
4764 if (bed->s->swap_reloc_in)
4765 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, &s->u.rel);
4767 elf_swap_reloc_in (abfd, erel, &s->u.rel);
4769 s->type = (*bed->elf_backend_reloc_type_class) (&s->u.rela);
4774 Elf_External_Rela *erela, *erelaend;
4775 struct elf_link_sort_rela *s;
4777 erela = (Elf_External_Rela *) o->contents;
4778 erelaend = (Elf_External_Rela *) (o->contents + o->_raw_size);
4779 s = rela + o->output_offset / sizeof (Elf_External_Rela);
4780 for (; erela < erelaend; erela++, s++)
4782 if (bed->s->swap_reloca_in)
4783 (*bed->s->swap_reloca_in) (dynobj, (bfd_byte *) erela,
4786 elf_swap_reloca_in (dynobj, erela, &s->u.rela);
4788 s->type = (*bed->elf_backend_reloc_type_class) (&s->u.rela);
4793 qsort (rela, (size_t) count, sizeof (*rela), elf_link_sort_cmp1);
4794 for (ret = 0; ret < count && rela[ret].type == reloc_class_relative; ret++)
4796 for (i = ret, j = ret; i < count; i++)
4798 if (ELF_R_SYM (rela[i].u.rel.r_info) != ELF_R_SYM (rela[j].u.rel.r_info))
4800 rela[i].offset = rela[j].u.rel.r_offset;
4802 qsort (rela + ret, (size_t) count - ret, sizeof (*rela), elf_link_sort_cmp2);
4804 for (o = dynobj->sections; o != NULL; o = o->next)
4805 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4806 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4807 && o->output_section == reldyn)
4811 Elf_External_Rel *erel, *erelend;
4812 struct elf_link_sort_rela *s;
4814 erel = (Elf_External_Rel *) o->contents;
4815 erelend = (Elf_External_Rel *) (o->contents + o->_raw_size);
4816 s = rela + o->output_offset / sizeof (Elf_External_Rel);
4817 for (; erel < erelend; erel++, s++)
4819 if (bed->s->swap_reloc_out)
4820 (*bed->s->swap_reloc_out) (abfd, &s->u.rel,
4823 elf_swap_reloc_out (abfd, &s->u.rel, erel);
4828 Elf_External_Rela *erela, *erelaend;
4829 struct elf_link_sort_rela *s;
4831 erela = (Elf_External_Rela *) o->contents;
4832 erelaend = (Elf_External_Rela *) (o->contents + o->_raw_size);
4833 s = rela + o->output_offset / sizeof (Elf_External_Rela);
4834 for (; erela < erelaend; erela++, s++)
4836 if (bed->s->swap_reloca_out)
4837 (*bed->s->swap_reloca_out) (dynobj, &s->u.rela,
4838 (bfd_byte *) erela);
4840 elf_swap_reloca_out (dynobj, &s->u.rela, erela);
4850 /* Do the final step of an ELF link. */
4853 elf_bfd_final_link (abfd, info)
4855 struct bfd_link_info *info;
4858 boolean emit_relocs;
4860 struct elf_final_link_info finfo;
4861 register asection *o;
4862 register struct bfd_link_order *p;
4864 bfd_size_type max_contents_size;
4865 bfd_size_type max_external_reloc_size;
4866 bfd_size_type max_internal_reloc_count;
4867 bfd_size_type max_sym_count;
4868 bfd_size_type max_sym_shndx_count;
4870 Elf_Internal_Sym elfsym;
4872 Elf_Internal_Shdr *symtab_hdr;
4873 Elf_Internal_Shdr *symstrtab_hdr;
4874 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4875 struct elf_outext_info eoinfo;
4877 size_t relativecount = 0;
4878 asection *reldyn = 0;
4881 if (! is_elf_hash_table (info))
4885 abfd->flags |= DYNAMIC;
4887 dynamic = elf_hash_table (info)->dynamic_sections_created;
4888 dynobj = elf_hash_table (info)->dynobj;
4890 emit_relocs = (info->relocateable
4891 || info->emitrelocations
4892 || bed->elf_backend_emit_relocs);
4895 finfo.output_bfd = abfd;
4896 finfo.symstrtab = elf_stringtab_init ();
4897 if (finfo.symstrtab == NULL)
4902 finfo.dynsym_sec = NULL;
4903 finfo.hash_sec = NULL;
4904 finfo.symver_sec = NULL;
4908 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
4909 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
4910 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
4911 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
4912 /* Note that it is OK if symver_sec is NULL. */
4915 finfo.contents = NULL;
4916 finfo.external_relocs = NULL;
4917 finfo.internal_relocs = NULL;
4918 finfo.external_syms = NULL;
4919 finfo.locsym_shndx = NULL;
4920 finfo.internal_syms = NULL;
4921 finfo.indices = NULL;
4922 finfo.sections = NULL;
4923 finfo.symbuf = NULL;
4924 finfo.symshndxbuf = NULL;
4925 finfo.symbuf_count = 0;
4926 finfo.first_tls_sec = NULL;
4927 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4928 if ((o->flags & SEC_THREAD_LOCAL) != 0
4929 && (o->flags & SEC_LOAD) != 0)
4931 finfo.first_tls_sec = o;
4935 /* Count up the number of relocations we will output for each output
4936 section, so that we know the sizes of the reloc sections. We
4937 also figure out some maximum sizes. */
4938 max_contents_size = 0;
4939 max_external_reloc_size = 0;
4940 max_internal_reloc_count = 0;
4942 max_sym_shndx_count = 0;
4944 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4948 for (p = o->link_order_head; p != NULL; p = p->next)
4950 if (p->type == bfd_section_reloc_link_order
4951 || p->type == bfd_symbol_reloc_link_order)
4953 else if (p->type == bfd_indirect_link_order)
4957 sec = p->u.indirect.section;
4959 /* Mark all sections which are to be included in the
4960 link. This will normally be every section. We need
4961 to do this so that we can identify any sections which
4962 the linker has decided to not include. */
4963 sec->linker_mark = true;
4965 if (sec->flags & SEC_MERGE)
4968 if (info->relocateable || info->emitrelocations)
4969 o->reloc_count += sec->reloc_count;
4970 else if (bed->elf_backend_count_relocs)
4972 Elf_Internal_Rela * relocs;
4974 relocs = (NAME(_bfd_elf,link_read_relocs)
4975 (abfd, sec, (PTR) NULL,
4976 (Elf_Internal_Rela *) NULL, info->keep_memory));
4979 += (*bed->elf_backend_count_relocs) (sec, relocs);
4981 if (elf_section_data (o)->relocs != relocs)
4985 if (sec->_raw_size > max_contents_size)
4986 max_contents_size = sec->_raw_size;
4987 if (sec->_cooked_size > max_contents_size)
4988 max_contents_size = sec->_cooked_size;
4990 /* We are interested in just local symbols, not all
4992 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
4993 && (sec->owner->flags & DYNAMIC) == 0)
4997 if (elf_bad_symtab (sec->owner))
4998 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
4999 / sizeof (Elf_External_Sym));
5001 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
5003 if (sym_count > max_sym_count)
5004 max_sym_count = sym_count;
5006 if (sym_count > max_sym_shndx_count
5007 && elf_symtab_shndx (sec->owner) != 0)
5008 max_sym_shndx_count = sym_count;
5010 if ((sec->flags & SEC_RELOC) != 0)
5014 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
5015 if (ext_size > max_external_reloc_size)
5016 max_external_reloc_size = ext_size;
5017 if (sec->reloc_count > max_internal_reloc_count)
5018 max_internal_reloc_count = sec->reloc_count;
5024 if (o->reloc_count > 0)
5025 o->flags |= SEC_RELOC;
5028 /* Explicitly clear the SEC_RELOC flag. The linker tends to
5029 set it (this is probably a bug) and if it is set
5030 assign_section_numbers will create a reloc section. */
5031 o->flags &=~ SEC_RELOC;
5034 /* If the SEC_ALLOC flag is not set, force the section VMA to
5035 zero. This is done in elf_fake_sections as well, but forcing
5036 the VMA to 0 here will ensure that relocs against these
5037 sections are handled correctly. */
5038 if ((o->flags & SEC_ALLOC) == 0
5039 && ! o->user_set_vma)
5043 if (! info->relocateable && merged)
5044 elf_link_hash_traverse (elf_hash_table (info),
5045 elf_link_sec_merge_syms, (PTR) abfd);
5047 /* Figure out the file positions for everything but the symbol table
5048 and the relocs. We set symcount to force assign_section_numbers
5049 to create a symbol table. */
5050 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
5051 BFD_ASSERT (! abfd->output_has_begun);
5052 if (! _bfd_elf_compute_section_file_positions (abfd, info))
5055 /* Figure out how many relocations we will have in each section.
5056 Just using RELOC_COUNT isn't good enough since that doesn't
5057 maintain a separate value for REL vs. RELA relocations. */
5059 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
5060 for (o = sub->sections; o != NULL; o = o->next)
5062 asection *output_section;
5064 if (! o->linker_mark)
5066 /* This section was omitted from the link. */
5070 output_section = o->output_section;
5072 if (output_section != NULL
5073 && (o->flags & SEC_RELOC) != 0)
5075 struct bfd_elf_section_data *esdi
5076 = elf_section_data (o);
5077 struct bfd_elf_section_data *esdo
5078 = elf_section_data (output_section);
5079 unsigned int *rel_count;
5080 unsigned int *rel_count2;
5081 bfd_size_type entsize;
5082 bfd_size_type entsize2;
5084 /* We must be careful to add the relocations from the
5085 input section to the right output count. */
5086 entsize = esdi->rel_hdr.sh_entsize;
5087 entsize2 = esdi->rel_hdr2 ? esdi->rel_hdr2->sh_entsize : 0;
5088 BFD_ASSERT ((entsize == sizeof (Elf_External_Rel)
5089 || entsize == sizeof (Elf_External_Rela))
5090 && entsize2 != entsize
5092 || entsize2 == sizeof (Elf_External_Rel)
5093 || entsize2 == sizeof (Elf_External_Rela)));
5094 if (entsize == esdo->rel_hdr.sh_entsize)
5096 rel_count = &esdo->rel_count;
5097 rel_count2 = &esdo->rel_count2;
5101 rel_count = &esdo->rel_count2;
5102 rel_count2 = &esdo->rel_count;
5105 *rel_count += NUM_SHDR_ENTRIES (& esdi->rel_hdr);
5107 *rel_count2 += NUM_SHDR_ENTRIES (esdi->rel_hdr2);
5108 output_section->flags |= SEC_RELOC;
5112 /* That created the reloc sections. Set their sizes, and assign
5113 them file positions, and allocate some buffers. */
5114 for (o = abfd->sections; o != NULL; o = o->next)
5116 if ((o->flags & SEC_RELOC) != 0)
5118 if (!elf_link_size_reloc_section (abfd,
5119 &elf_section_data (o)->rel_hdr,
5123 if (elf_section_data (o)->rel_hdr2
5124 && !elf_link_size_reloc_section (abfd,
5125 elf_section_data (o)->rel_hdr2,
5130 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
5131 to count upwards while actually outputting the relocations. */
5132 elf_section_data (o)->rel_count = 0;
5133 elf_section_data (o)->rel_count2 = 0;
5136 _bfd_elf_assign_file_positions_for_relocs (abfd);
5138 /* We have now assigned file positions for all the sections except
5139 .symtab and .strtab. We start the .symtab section at the current
5140 file position, and write directly to it. We build the .strtab
5141 section in memory. */
5142 bfd_get_symcount (abfd) = 0;
5143 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
5144 /* sh_name is set in prep_headers. */
5145 symtab_hdr->sh_type = SHT_SYMTAB;
5146 symtab_hdr->sh_flags = 0;
5147 symtab_hdr->sh_addr = 0;
5148 symtab_hdr->sh_size = 0;
5149 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
5150 /* sh_link is set in assign_section_numbers. */
5151 /* sh_info is set below. */
5152 /* sh_offset is set just below. */
5153 symtab_hdr->sh_addralign = bed->s->file_align;
5155 off = elf_tdata (abfd)->next_file_pos;
5156 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
5158 /* Note that at this point elf_tdata (abfd)->next_file_pos is
5159 incorrect. We do not yet know the size of the .symtab section.
5160 We correct next_file_pos below, after we do know the size. */
5162 /* Allocate a buffer to hold swapped out symbols. This is to avoid
5163 continuously seeking to the right position in the file. */
5164 if (! info->keep_memory || max_sym_count < 20)
5165 finfo.symbuf_size = 20;
5167 finfo.symbuf_size = max_sym_count;
5168 amt = finfo.symbuf_size;
5169 amt *= sizeof (Elf_External_Sym);
5170 finfo.symbuf = (Elf_External_Sym *) bfd_malloc (amt);
5171 if (finfo.symbuf == NULL)
5173 if (elf_numsections (abfd) > SHN_LORESERVE)
5175 amt = finfo.symbuf_size;
5176 amt *= sizeof (Elf_External_Sym_Shndx);
5177 finfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
5178 if (finfo.symshndxbuf == NULL)
5182 /* Start writing out the symbol table. The first symbol is always a
5184 if (info->strip != strip_all
5187 elfsym.st_value = 0;
5190 elfsym.st_other = 0;
5191 elfsym.st_shndx = SHN_UNDEF;
5192 if (! elf_link_output_sym (&finfo, (const char *) NULL,
5193 &elfsym, bfd_und_section_ptr))
5198 /* Some standard ELF linkers do this, but we don't because it causes
5199 bootstrap comparison failures. */
5200 /* Output a file symbol for the output file as the second symbol.
5201 We output this even if we are discarding local symbols, although
5202 I'm not sure if this is correct. */
5203 elfsym.st_value = 0;
5205 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
5206 elfsym.st_other = 0;
5207 elfsym.st_shndx = SHN_ABS;
5208 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
5209 &elfsym, bfd_abs_section_ptr))
5213 /* Output a symbol for each section. We output these even if we are
5214 discarding local symbols, since they are used for relocs. These
5215 symbols have no names. We store the index of each one in the
5216 index field of the section, so that we can find it again when
5217 outputting relocs. */
5218 if (info->strip != strip_all
5222 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
5223 elfsym.st_other = 0;
5224 for (i = 1; i < elf_numsections (abfd); i++)
5226 o = section_from_elf_index (abfd, i);
5228 o->target_index = bfd_get_symcount (abfd);
5229 elfsym.st_shndx = i;
5230 if (info->relocateable || o == NULL)
5231 elfsym.st_value = 0;
5233 elfsym.st_value = o->vma;
5234 if (! elf_link_output_sym (&finfo, (const char *) NULL,
5237 if (i == SHN_LORESERVE)
5238 i += SHN_HIRESERVE + 1 - SHN_LORESERVE;
5242 /* Allocate some memory to hold information read in from the input
5244 if (max_contents_size != 0)
5246 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
5247 if (finfo.contents == NULL)
5251 if (max_external_reloc_size != 0)
5253 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
5254 if (finfo.external_relocs == NULL)
5258 if (max_internal_reloc_count != 0)
5260 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
5261 amt *= sizeof (Elf_Internal_Rela);
5262 finfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
5263 if (finfo.internal_relocs == NULL)
5267 if (max_sym_count != 0)
5269 amt = max_sym_count * sizeof (Elf_External_Sym);
5270 finfo.external_syms = (Elf_External_Sym *) bfd_malloc (amt);
5271 if (finfo.external_syms == NULL)
5274 amt = max_sym_count * sizeof (Elf_Internal_Sym);
5275 finfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
5276 if (finfo.internal_syms == NULL)
5279 amt = max_sym_count * sizeof (long);
5280 finfo.indices = (long *) bfd_malloc (amt);
5281 if (finfo.indices == NULL)
5284 amt = max_sym_count * sizeof (asection *);
5285 finfo.sections = (asection **) bfd_malloc (amt);
5286 if (finfo.sections == NULL)
5290 if (max_sym_shndx_count != 0)
5292 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
5293 finfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
5294 if (finfo.locsym_shndx == NULL)
5298 if (finfo.first_tls_sec)
5300 unsigned int align = 0;
5301 bfd_vma base = finfo.first_tls_sec->vma, end = 0;
5304 for (sec = finfo.first_tls_sec;
5305 sec && (sec->flags & SEC_THREAD_LOCAL);
5308 bfd_vma size = sec->_raw_size;
5310 if (bfd_get_section_alignment (abfd, sec) > align)
5311 align = bfd_get_section_alignment (abfd, sec);
5312 if (sec->_raw_size == 0 && (sec->flags & SEC_HAS_CONTENTS) == 0)
5314 struct bfd_link_order *o;
5317 for (o = sec->link_order_head; o != NULL; o = o->next)
5318 if (size < o->offset + o->size)
5319 size = o->offset + o->size;
5321 end = sec->vma + size;
5323 elf_hash_table (info)->tls_segment
5324 = bfd_zalloc (abfd, sizeof (struct elf_link_tls_segment));
5325 if (elf_hash_table (info)->tls_segment == NULL)
5327 elf_hash_table (info)->tls_segment->start = base;
5328 elf_hash_table (info)->tls_segment->size = end - base;
5329 elf_hash_table (info)->tls_segment->align = align;
5332 /* Since ELF permits relocations to be against local symbols, we
5333 must have the local symbols available when we do the relocations.
5334 Since we would rather only read the local symbols once, and we
5335 would rather not keep them in memory, we handle all the
5336 relocations for a single input file at the same time.
5338 Unfortunately, there is no way to know the total number of local
5339 symbols until we have seen all of them, and the local symbol
5340 indices precede the global symbol indices. This means that when
5341 we are generating relocateable output, and we see a reloc against
5342 a global symbol, we can not know the symbol index until we have
5343 finished examining all the local symbols to see which ones we are
5344 going to output. To deal with this, we keep the relocations in
5345 memory, and don't output them until the end of the link. This is
5346 an unfortunate waste of memory, but I don't see a good way around
5347 it. Fortunately, it only happens when performing a relocateable
5348 link, which is not the common case. FIXME: If keep_memory is set
5349 we could write the relocs out and then read them again; I don't
5350 know how bad the memory loss will be. */
5352 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
5353 sub->output_has_begun = false;
5354 for (o = abfd->sections; o != NULL; o = o->next)
5356 for (p = o->link_order_head; p != NULL; p = p->next)
5358 if (p->type == bfd_indirect_link_order
5359 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
5360 == bfd_target_elf_flavour)
5361 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
5363 if (! sub->output_has_begun)
5365 if (! elf_link_input_bfd (&finfo, sub))
5367 sub->output_has_begun = true;
5370 else if (p->type == bfd_section_reloc_link_order
5371 || p->type == bfd_symbol_reloc_link_order)
5373 if (! elf_reloc_link_order (abfd, info, o, p))
5378 if (! _bfd_default_link_order (abfd, info, o, p))
5384 /* Output any global symbols that got converted to local in a
5385 version script or due to symbol visibility. We do this in a
5386 separate step since ELF requires all local symbols to appear
5387 prior to any global symbols. FIXME: We should only do this if
5388 some global symbols were, in fact, converted to become local.
5389 FIXME: Will this work correctly with the Irix 5 linker? */
5390 eoinfo.failed = false;
5391 eoinfo.finfo = &finfo;
5392 eoinfo.localsyms = true;
5393 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
5398 /* That wrote out all the local symbols. Finish up the symbol table
5399 with the global symbols. Even if we want to strip everything we
5400 can, we still need to deal with those global symbols that got
5401 converted to local in a version script. */
5403 /* The sh_info field records the index of the first non local symbol. */
5404 symtab_hdr->sh_info = bfd_get_symcount (abfd);
5407 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
5409 Elf_Internal_Sym sym;
5410 Elf_External_Sym *dynsym =
5411 (Elf_External_Sym *) finfo.dynsym_sec->contents;
5412 long last_local = 0;
5414 /* Write out the section symbols for the output sections. */
5421 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
5424 for (s = abfd->sections; s != NULL; s = s->next)
5427 Elf_External_Sym *dest;
5429 indx = elf_section_data (s)->this_idx;
5430 BFD_ASSERT (indx > 0);
5431 sym.st_shndx = indx;
5432 sym.st_value = s->vma;
5433 dest = dynsym + elf_section_data (s)->dynindx;
5434 elf_swap_symbol_out (abfd, &sym, (PTR) dest, (PTR) 0);
5437 last_local = bfd_count_sections (abfd);
5440 /* Write out the local dynsyms. */
5441 if (elf_hash_table (info)->dynlocal)
5443 struct elf_link_local_dynamic_entry *e;
5444 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
5447 Elf_External_Sym *dest;
5449 sym.st_size = e->isym.st_size;
5450 sym.st_other = e->isym.st_other;
5452 /* Copy the internal symbol as is.
5453 Note that we saved a word of storage and overwrote
5454 the original st_name with the dynstr_index. */
5457 if (e->isym.st_shndx != SHN_UNDEF
5458 && (e->isym.st_shndx < SHN_LORESERVE
5459 || e->isym.st_shndx > SHN_HIRESERVE))
5461 s = bfd_section_from_elf_index (e->input_bfd,
5465 elf_section_data (s->output_section)->this_idx;
5466 sym.st_value = (s->output_section->vma
5468 + e->isym.st_value);
5471 if (last_local < e->dynindx)
5472 last_local = e->dynindx;
5474 dest = dynsym + e->dynindx;
5475 elf_swap_symbol_out (abfd, &sym, (PTR) dest, (PTR) 0);
5479 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
5483 /* We get the global symbols from the hash table. */
5484 eoinfo.failed = false;
5485 eoinfo.localsyms = false;
5486 eoinfo.finfo = &finfo;
5487 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
5492 /* If backend needs to output some symbols not present in the hash
5493 table, do it now. */
5494 if (bed->elf_backend_output_arch_syms)
5496 typedef boolean (*out_sym_func) PARAMS ((PTR, const char *,
5500 if (! ((*bed->elf_backend_output_arch_syms)
5501 (abfd, info, (PTR) &finfo, (out_sym_func) elf_link_output_sym)))
5505 /* Flush all symbols to the file. */
5506 if (! elf_link_flush_output_syms (&finfo))
5509 /* Now we know the size of the symtab section. */
5510 off += symtab_hdr->sh_size;
5512 /* Finish up and write out the symbol string table (.strtab)
5514 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
5515 /* sh_name was set in prep_headers. */
5516 symstrtab_hdr->sh_type = SHT_STRTAB;
5517 symstrtab_hdr->sh_flags = 0;
5518 symstrtab_hdr->sh_addr = 0;
5519 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
5520 symstrtab_hdr->sh_entsize = 0;
5521 symstrtab_hdr->sh_link = 0;
5522 symstrtab_hdr->sh_info = 0;
5523 /* sh_offset is set just below. */
5524 symstrtab_hdr->sh_addralign = 1;
5526 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
5527 elf_tdata (abfd)->next_file_pos = off;
5529 if (bfd_get_symcount (abfd) > 0)
5531 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
5532 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
5536 /* Adjust the relocs to have the correct symbol indices. */
5537 for (o = abfd->sections; o != NULL; o = o->next)
5539 if ((o->flags & SEC_RELOC) == 0)
5542 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
5543 elf_section_data (o)->rel_count,
5544 elf_section_data (o)->rel_hashes);
5545 if (elf_section_data (o)->rel_hdr2 != NULL)
5546 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
5547 elf_section_data (o)->rel_count2,
5548 (elf_section_data (o)->rel_hashes
5549 + elf_section_data (o)->rel_count));
5551 /* Set the reloc_count field to 0 to prevent write_relocs from
5552 trying to swap the relocs out itself. */
5556 if (dynamic && info->combreloc && dynobj != NULL)
5557 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
5559 /* If we are linking against a dynamic object, or generating a
5560 shared library, finish up the dynamic linking information. */
5563 Elf_External_Dyn *dyncon, *dynconend;
5565 /* Fix up .dynamic entries. */
5566 o = bfd_get_section_by_name (dynobj, ".dynamic");
5567 BFD_ASSERT (o != NULL);
5569 dyncon = (Elf_External_Dyn *) o->contents;
5570 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
5571 for (; dyncon < dynconend; dyncon++)
5573 Elf_Internal_Dyn dyn;
5577 elf_swap_dyn_in (dynobj, dyncon, &dyn);
5584 if (relativecount > 0 && dyncon + 1 < dynconend)
5586 switch (elf_section_data (reldyn)->this_hdr.sh_type)
5588 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
5589 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
5592 if (dyn.d_tag != DT_NULL)
5594 dyn.d_un.d_val = relativecount;
5595 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5601 name = info->init_function;
5604 name = info->fini_function;
5607 struct elf_link_hash_entry *h;
5609 h = elf_link_hash_lookup (elf_hash_table (info), name,
5610 false, false, true);
5612 && (h->root.type == bfd_link_hash_defined
5613 || h->root.type == bfd_link_hash_defweak))
5615 dyn.d_un.d_val = h->root.u.def.value;
5616 o = h->root.u.def.section;
5617 if (o->output_section != NULL)
5618 dyn.d_un.d_val += (o->output_section->vma
5619 + o->output_offset);
5622 /* The symbol is imported from another shared
5623 library and does not apply to this one. */
5627 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5632 case DT_PREINIT_ARRAYSZ:
5633 name = ".preinit_array";
5635 case DT_INIT_ARRAYSZ:
5636 name = ".init_array";
5638 case DT_FINI_ARRAYSZ:
5639 name = ".fini_array";
5641 o = bfd_get_section_by_name (abfd, name);
5644 (*_bfd_error_handler)
5645 (_("%s: could not find output section %s"),
5646 bfd_get_filename (abfd), name);
5649 if (o->_raw_size == 0)
5650 (*_bfd_error_handler)
5651 (_("warning: %s section has zero size"), name);
5652 dyn.d_un.d_val = o->_raw_size;
5653 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5656 case DT_PREINIT_ARRAY:
5657 name = ".preinit_array";
5660 name = ".init_array";
5663 name = ".fini_array";
5676 name = ".gnu.version_d";
5679 name = ".gnu.version_r";
5682 name = ".gnu.version";
5684 o = bfd_get_section_by_name (abfd, name);
5687 (*_bfd_error_handler)
5688 (_("%s: could not find output section %s"),
5689 bfd_get_filename (abfd), name);
5692 dyn.d_un.d_ptr = o->vma;
5693 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5700 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
5705 for (i = 1; i < elf_numsections (abfd); i++)
5707 Elf_Internal_Shdr *hdr;
5709 hdr = elf_elfsections (abfd)[i];
5710 if (hdr->sh_type == type
5711 && (hdr->sh_flags & SHF_ALLOC) != 0)
5713 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
5714 dyn.d_un.d_val += hdr->sh_size;
5717 if (dyn.d_un.d_val == 0
5718 || hdr->sh_addr < dyn.d_un.d_val)
5719 dyn.d_un.d_val = hdr->sh_addr;
5723 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5729 /* If we have created any dynamic sections, then output them. */
5732 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
5735 for (o = dynobj->sections; o != NULL; o = o->next)
5737 if ((o->flags & SEC_HAS_CONTENTS) == 0
5738 || o->_raw_size == 0
5739 || o->output_section == bfd_abs_section_ptr)
5741 if ((o->flags & SEC_LINKER_CREATED) == 0)
5743 /* At this point, we are only interested in sections
5744 created by elf_link_create_dynamic_sections. */
5747 if ((elf_section_data (o->output_section)->this_hdr.sh_type
5749 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
5751 if (! bfd_set_section_contents (abfd, o->output_section,
5753 (file_ptr) o->output_offset,
5759 /* The contents of the .dynstr section are actually in a
5761 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
5762 if (bfd_seek (abfd, off, SEEK_SET) != 0
5763 || ! _bfd_elf_strtab_emit (abfd,
5764 elf_hash_table (info)->dynstr))
5770 if (info->relocateable)
5772 boolean failed = false;
5774 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
5779 /* If we have optimized stabs strings, output them. */
5780 if (elf_hash_table (info)->stab_info != NULL)
5782 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
5786 if (info->eh_frame_hdr && elf_hash_table (info)->dynobj)
5788 o = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
5791 && (elf_section_data (o)->sec_info_type
5792 == ELF_INFO_TYPE_EH_FRAME_HDR))
5794 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, o))
5799 if (finfo.symstrtab != NULL)
5800 _bfd_stringtab_free (finfo.symstrtab);
5801 if (finfo.contents != NULL)
5802 free (finfo.contents);
5803 if (finfo.external_relocs != NULL)
5804 free (finfo.external_relocs);
5805 if (finfo.internal_relocs != NULL)
5806 free (finfo.internal_relocs);
5807 if (finfo.external_syms != NULL)
5808 free (finfo.external_syms);
5809 if (finfo.locsym_shndx != NULL)
5810 free (finfo.locsym_shndx);
5811 if (finfo.internal_syms != NULL)
5812 free (finfo.internal_syms);
5813 if (finfo.indices != NULL)
5814 free (finfo.indices);
5815 if (finfo.sections != NULL)
5816 free (finfo.sections);
5817 if (finfo.symbuf != NULL)
5818 free (finfo.symbuf);
5819 if (finfo.symshndxbuf != NULL)
5820 free (finfo.symbuf);
5821 for (o = abfd->sections; o != NULL; o = o->next)
5823 if ((o->flags & SEC_RELOC) != 0
5824 && elf_section_data (o)->rel_hashes != NULL)
5825 free (elf_section_data (o)->rel_hashes);
5828 elf_tdata (abfd)->linker = true;
5833 if (finfo.symstrtab != NULL)
5834 _bfd_stringtab_free (finfo.symstrtab);
5835 if (finfo.contents != NULL)
5836 free (finfo.contents);
5837 if (finfo.external_relocs != NULL)
5838 free (finfo.external_relocs);
5839 if (finfo.internal_relocs != NULL)
5840 free (finfo.internal_relocs);
5841 if (finfo.external_syms != NULL)
5842 free (finfo.external_syms);
5843 if (finfo.locsym_shndx != NULL)
5844 free (finfo.locsym_shndx);
5845 if (finfo.internal_syms != NULL)
5846 free (finfo.internal_syms);
5847 if (finfo.indices != NULL)
5848 free (finfo.indices);
5849 if (finfo.sections != NULL)
5850 free (finfo.sections);
5851 if (finfo.symbuf != NULL)
5852 free (finfo.symbuf);
5853 if (finfo.symshndxbuf != NULL)
5854 free (finfo.symbuf);
5855 for (o = abfd->sections; o != NULL; o = o->next)
5857 if ((o->flags & SEC_RELOC) != 0
5858 && elf_section_data (o)->rel_hashes != NULL)
5859 free (elf_section_data (o)->rel_hashes);
5865 /* Add a symbol to the output symbol table. */
5868 elf_link_output_sym (finfo, name, elfsym, input_sec)
5869 struct elf_final_link_info *finfo;
5871 Elf_Internal_Sym *elfsym;
5872 asection *input_sec;
5874 Elf_External_Sym *dest;
5875 Elf_External_Sym_Shndx *destshndx;
5877 boolean (*output_symbol_hook) PARAMS ((bfd *,
5878 struct bfd_link_info *info,
5883 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
5884 elf_backend_link_output_symbol_hook;
5885 if (output_symbol_hook != NULL)
5887 if (! ((*output_symbol_hook)
5888 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
5892 if (name == (const char *) NULL || *name == '\0')
5893 elfsym->st_name = 0;
5894 else if (input_sec->flags & SEC_EXCLUDE)
5895 elfsym->st_name = 0;
5898 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
5900 if (elfsym->st_name == (unsigned long) -1)
5904 if (finfo->symbuf_count >= finfo->symbuf_size)
5906 if (! elf_link_flush_output_syms (finfo))
5910 dest = finfo->symbuf + finfo->symbuf_count;
5911 destshndx = finfo->symshndxbuf;
5912 if (destshndx != NULL)
5913 destshndx += finfo->symbuf_count;
5914 elf_swap_symbol_out (finfo->output_bfd, elfsym, (PTR) dest, (PTR) destshndx);
5915 ++finfo->symbuf_count;
5917 ++ bfd_get_symcount (finfo->output_bfd);
5922 /* Flush the output symbols to the file. */
5925 elf_link_flush_output_syms (finfo)
5926 struct elf_final_link_info *finfo;
5928 if (finfo->symbuf_count > 0)
5930 Elf_Internal_Shdr *hdr;
5934 hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
5935 pos = hdr->sh_offset + hdr->sh_size;
5936 amt = finfo->symbuf_count * sizeof (Elf_External_Sym);
5937 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
5938 || bfd_bwrite ((PTR) finfo->symbuf, amt, finfo->output_bfd) != amt)
5941 hdr->sh_size += amt;
5943 if (finfo->symshndxbuf != NULL)
5945 hdr = &elf_tdata (finfo->output_bfd)->symtab_shndx_hdr;
5946 pos = hdr->sh_offset + hdr->sh_size;
5947 amt = finfo->symbuf_count * sizeof (Elf_External_Sym_Shndx);
5948 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
5949 || (bfd_bwrite ((PTR) finfo->symshndxbuf, amt, finfo->output_bfd)
5953 hdr->sh_size += amt;
5956 finfo->symbuf_count = 0;
5962 /* Adjust all external symbols pointing into SEC_MERGE sections
5963 to reflect the object merging within the sections. */
5966 elf_link_sec_merge_syms (h, data)
5967 struct elf_link_hash_entry *h;
5972 if (h->root.type == bfd_link_hash_warning)
5973 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5975 if ((h->root.type == bfd_link_hash_defined
5976 || h->root.type == bfd_link_hash_defweak)
5977 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
5978 && elf_section_data (sec)->sec_info_type == ELF_INFO_TYPE_MERGE)
5980 bfd *output_bfd = (bfd *) data;
5982 h->root.u.def.value =
5983 _bfd_merged_section_offset (output_bfd,
5984 &h->root.u.def.section,
5985 elf_section_data (sec)->sec_info,
5986 h->root.u.def.value, (bfd_vma) 0);
5992 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
5993 allowing an unsatisfied unversioned symbol in the DSO to match a
5994 versioned symbol that would normally require an explicit version. */
5997 elf_link_check_versioned_symbol (info, h)
5998 struct bfd_link_info *info;
5999 struct elf_link_hash_entry *h;
6001 bfd *undef_bfd = h->root.u.undef.abfd;
6002 struct elf_link_loaded_list *loaded;
6004 if ((undef_bfd->flags & DYNAMIC) == 0
6005 || info->hash->creator->flavour != bfd_target_elf_flavour
6006 || elf_dt_soname (h->root.u.undef.abfd) == NULL)
6009 for (loaded = elf_hash_table (info)->loaded;
6011 loaded = loaded->next)
6014 Elf_Internal_Shdr *hdr;
6015 bfd_size_type symcount;
6016 bfd_size_type extsymcount;
6017 bfd_size_type extsymoff;
6018 Elf_Internal_Shdr *versymhdr;
6019 Elf_Internal_Sym *isym;
6020 Elf_Internal_Sym *isymend;
6021 Elf_Internal_Sym *isymbuf;
6022 Elf_External_Versym *ever;
6023 Elf_External_Versym *extversym;
6025 input = loaded->abfd;
6027 /* We check each DSO for a possible hidden versioned definition. */
6028 if (input == undef_bfd
6029 || (input->flags & DYNAMIC) == 0
6030 || elf_dynversym (input) == 0)
6033 hdr = &elf_tdata (input)->dynsymtab_hdr;
6035 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
6036 if (elf_bad_symtab (input))
6038 extsymcount = symcount;
6043 extsymcount = symcount - hdr->sh_info;
6044 extsymoff = hdr->sh_info;
6047 if (extsymcount == 0)
6050 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
6052 if (isymbuf == NULL)
6055 /* Read in any version definitions. */
6056 versymhdr = &elf_tdata (input)->dynversym_hdr;
6057 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
6058 if (extversym == NULL)
6061 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
6062 || (bfd_bread ((PTR) extversym, versymhdr->sh_size, input)
6063 != versymhdr->sh_size))
6071 ever = extversym + extsymoff;
6072 isymend = isymbuf + extsymcount;
6073 for (isym = isymbuf; isym < isymend; isym++, ever++)
6076 Elf_Internal_Versym iver;
6078 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
6079 || isym->st_shndx == SHN_UNDEF)
6082 name = bfd_elf_string_from_elf_section (input,
6085 if (strcmp (name, h->root.root.string) != 0)
6088 _bfd_elf_swap_versym_in (input, ever, &iver);
6090 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
6092 /* If we have a non-hidden versioned sym, then it should
6093 have provided a definition for the undefined sym. */
6097 if ((iver.vs_vers & VERSYM_VERSION) == 2)
6099 /* This is the oldest (default) sym. We can use it. */
6113 /* Add an external symbol to the symbol table. This is called from
6114 the hash table traversal routine. When generating a shared object,
6115 we go through the symbol table twice. The first time we output
6116 anything that might have been forced to local scope in a version
6117 script. The second time we output the symbols that are still
6121 elf_link_output_extsym (h, data)
6122 struct elf_link_hash_entry *h;
6125 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
6126 struct elf_final_link_info *finfo = eoinfo->finfo;
6128 Elf_Internal_Sym sym;
6129 asection *input_sec;
6131 if (h->root.type == bfd_link_hash_warning)
6133 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6134 if (h->root.type == bfd_link_hash_new)
6138 /* Decide whether to output this symbol in this pass. */
6139 if (eoinfo->localsyms)
6141 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6146 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6150 /* If we are not creating a shared library, and this symbol is
6151 referenced by a shared library but is not defined anywhere, then
6152 warn that it is undefined. If we do not do this, the runtime
6153 linker will complain that the symbol is undefined when the
6154 program is run. We don't have to worry about symbols that are
6155 referenced by regular files, because we will already have issued
6156 warnings for them. */
6157 if (! finfo->info->relocateable
6158 && ! finfo->info->allow_shlib_undefined
6159 && ! finfo->info->shared
6160 && h->root.type == bfd_link_hash_undefined
6161 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
6162 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
6163 && ! elf_link_check_versioned_symbol (finfo->info, h))
6165 if (! ((*finfo->info->callbacks->undefined_symbol)
6166 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
6167 (asection *) NULL, (bfd_vma) 0, true)))
6169 eoinfo->failed = true;
6174 /* We don't want to output symbols that have never been mentioned by
6175 a regular file, or that we have been told to strip. However, if
6176 h->indx is set to -2, the symbol is used by a reloc and we must
6180 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
6181 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
6182 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
6183 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
6185 else if (finfo->info->strip == strip_all
6186 || (finfo->info->strip == strip_some
6187 && bfd_hash_lookup (finfo->info->keep_hash,
6188 h->root.root.string,
6189 false, false) == NULL))
6194 /* If we're stripping it, and it's not a dynamic symbol, there's
6195 nothing else to do unless it is a forced local symbol. */
6198 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6202 sym.st_size = h->size;
6203 sym.st_other = h->other;
6204 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6205 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
6206 else if (h->root.type == bfd_link_hash_undefweak
6207 || h->root.type == bfd_link_hash_defweak)
6208 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
6210 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
6212 switch (h->root.type)
6215 case bfd_link_hash_new:
6216 case bfd_link_hash_warning:
6220 case bfd_link_hash_undefined:
6221 case bfd_link_hash_undefweak:
6222 input_sec = bfd_und_section_ptr;
6223 sym.st_shndx = SHN_UNDEF;
6226 case bfd_link_hash_defined:
6227 case bfd_link_hash_defweak:
6229 input_sec = h->root.u.def.section;
6230 if (input_sec->output_section != NULL)
6233 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
6234 input_sec->output_section);
6235 if (sym.st_shndx == SHN_BAD)
6237 (*_bfd_error_handler)
6238 (_("%s: could not find output section %s for input section %s"),
6239 bfd_get_filename (finfo->output_bfd),
6240 input_sec->output_section->name,
6242 eoinfo->failed = true;
6246 /* ELF symbols in relocateable files are section relative,
6247 but in nonrelocateable files they are virtual
6249 sym.st_value = h->root.u.def.value + input_sec->output_offset;
6250 if (! finfo->info->relocateable)
6252 sym.st_value += input_sec->output_section->vma;
6253 if (h->type == STT_TLS)
6255 /* STT_TLS symbols are relative to PT_TLS segment
6257 BFD_ASSERT (finfo->first_tls_sec != NULL);
6258 sym.st_value -= finfo->first_tls_sec->vma;
6264 BFD_ASSERT (input_sec->owner == NULL
6265 || (input_sec->owner->flags & DYNAMIC) != 0);
6266 sym.st_shndx = SHN_UNDEF;
6267 input_sec = bfd_und_section_ptr;
6272 case bfd_link_hash_common:
6273 input_sec = h->root.u.c.p->section;
6274 sym.st_shndx = SHN_COMMON;
6275 sym.st_value = 1 << h->root.u.c.p->alignment_power;
6278 case bfd_link_hash_indirect:
6279 /* These symbols are created by symbol versioning. They point
6280 to the decorated version of the name. For example, if the
6281 symbol foo@@GNU_1.2 is the default, which should be used when
6282 foo is used with no version, then we add an indirect symbol
6283 foo which points to foo@@GNU_1.2. We ignore these symbols,
6284 since the indirected symbol is already in the hash table. */
6288 /* Give the processor backend a chance to tweak the symbol value,
6289 and also to finish up anything that needs to be done for this
6290 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6291 forced local syms when non-shared is due to a historical quirk. */
6292 if ((h->dynindx != -1
6293 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6294 && (finfo->info->shared
6295 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6296 && elf_hash_table (finfo->info)->dynamic_sections_created)
6298 struct elf_backend_data *bed;
6300 bed = get_elf_backend_data (finfo->output_bfd);
6301 if (! ((*bed->elf_backend_finish_dynamic_symbol)
6302 (finfo->output_bfd, finfo->info, h, &sym)))
6304 eoinfo->failed = true;
6309 /* If we are marking the symbol as undefined, and there are no
6310 non-weak references to this symbol from a regular object, then
6311 mark the symbol as weak undefined; if there are non-weak
6312 references, mark the symbol as strong. We can't do this earlier,
6313 because it might not be marked as undefined until the
6314 finish_dynamic_symbol routine gets through with it. */
6315 if (sym.st_shndx == SHN_UNDEF
6316 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
6317 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
6318 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
6322 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
6323 bindtype = STB_GLOBAL;
6325 bindtype = STB_WEAK;
6326 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
6329 /* If a symbol is not defined locally, we clear the visibility
6331 if (! finfo->info->relocateable
6332 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6333 sym.st_other ^= ELF_ST_VISIBILITY (sym.st_other);
6335 /* If this symbol should be put in the .dynsym section, then put it
6336 there now. We already know the symbol index. We also fill in
6337 the entry in the .hash section. */
6338 if (h->dynindx != -1
6339 && elf_hash_table (finfo->info)->dynamic_sections_created)
6343 size_t hash_entry_size;
6344 bfd_byte *bucketpos;
6346 Elf_External_Sym *esym;
6348 sym.st_name = h->dynstr_index;
6349 esym = (Elf_External_Sym *) finfo->dynsym_sec->contents + h->dynindx;
6350 elf_swap_symbol_out (finfo->output_bfd, &sym, (PTR) esym, (PTR) 0);
6352 bucketcount = elf_hash_table (finfo->info)->bucketcount;
6353 bucket = h->elf_hash_value % bucketcount;
6355 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
6356 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
6357 + (bucket + 2) * hash_entry_size);
6358 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
6359 bfd_put (8 * hash_entry_size, finfo->output_bfd, (bfd_vma) h->dynindx,
6361 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
6362 ((bfd_byte *) finfo->hash_sec->contents
6363 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
6365 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
6367 Elf_Internal_Versym iversym;
6368 Elf_External_Versym *eversym;
6370 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6372 if (h->verinfo.verdef == NULL)
6373 iversym.vs_vers = 0;
6375 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
6379 if (h->verinfo.vertree == NULL)
6380 iversym.vs_vers = 1;
6382 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
6385 if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
6386 iversym.vs_vers |= VERSYM_HIDDEN;
6388 eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
6389 eversym += h->dynindx;
6390 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
6394 /* If we're stripping it, then it was just a dynamic symbol, and
6395 there's nothing else to do. */
6396 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
6399 h->indx = bfd_get_symcount (finfo->output_bfd);
6401 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
6403 eoinfo->failed = true;
6410 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
6411 originated from the section given by INPUT_REL_HDR) to the
6415 elf_link_output_relocs (output_bfd, input_section, input_rel_hdr,
6418 asection *input_section;
6419 Elf_Internal_Shdr *input_rel_hdr;
6420 Elf_Internal_Rela *internal_relocs;
6422 Elf_Internal_Rela *irela;
6423 Elf_Internal_Rela *irelaend;
6424 Elf_Internal_Shdr *output_rel_hdr;
6425 asection *output_section;
6426 unsigned int *rel_countp = NULL;
6427 struct elf_backend_data *bed;
6430 output_section = input_section->output_section;
6431 output_rel_hdr = NULL;
6433 if (elf_section_data (output_section)->rel_hdr.sh_entsize
6434 == input_rel_hdr->sh_entsize)
6436 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
6437 rel_countp = &elf_section_data (output_section)->rel_count;
6439 else if (elf_section_data (output_section)->rel_hdr2
6440 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
6441 == input_rel_hdr->sh_entsize))
6443 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
6444 rel_countp = &elf_section_data (output_section)->rel_count2;
6448 (*_bfd_error_handler)
6449 (_("%s: relocation size mismatch in %s section %s"),
6450 bfd_get_filename (output_bfd),
6451 bfd_archive_filename (input_section->owner),
6452 input_section->name);
6453 bfd_set_error (bfd_error_wrong_object_format);
6457 bed = get_elf_backend_data (output_bfd);
6458 irela = internal_relocs;
6459 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
6460 * bed->s->int_rels_per_ext_rel);
6462 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
6464 Elf_External_Rel *erel;
6465 Elf_Internal_Rel *irel;
6467 amt = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
6468 irel = (Elf_Internal_Rel *) bfd_zmalloc (amt);
6471 (*_bfd_error_handler) (_("Error: out of memory"));
6475 erel = ((Elf_External_Rel *) output_rel_hdr->contents + *rel_countp);
6476 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erel++)
6480 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
6482 irel[i].r_offset = irela[i].r_offset;
6483 irel[i].r_info = irela[i].r_info;
6484 BFD_ASSERT (irela[i].r_addend == 0);
6487 if (bed->s->swap_reloc_out)
6488 (*bed->s->swap_reloc_out) (output_bfd, irel, (PTR) erel);
6490 elf_swap_reloc_out (output_bfd, irel, erel);
6497 Elf_External_Rela *erela;
6499 BFD_ASSERT (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rela));
6501 erela = ((Elf_External_Rela *) output_rel_hdr->contents + *rel_countp);
6502 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erela++)
6503 if (bed->s->swap_reloca_out)
6504 (*bed->s->swap_reloca_out) (output_bfd, irela, (PTR) erela);
6506 elf_swap_reloca_out (output_bfd, irela, erela);
6509 /* Bump the counter, so that we know where to add the next set of
6511 *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr);
6516 /* Link an input file into the linker output file. This function
6517 handles all the sections and relocations of the input file at once.
6518 This is so that we only have to read the local symbols once, and
6519 don't have to keep them in memory. */
6522 elf_link_input_bfd (finfo, input_bfd)
6523 struct elf_final_link_info *finfo;
6526 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
6527 bfd *, asection *, bfd_byte *,
6528 Elf_Internal_Rela *,
6529 Elf_Internal_Sym *, asection **));
6531 Elf_Internal_Shdr *symtab_hdr;
6534 Elf_Internal_Sym *isymbuf;
6535 Elf_Internal_Sym *isym;
6536 Elf_Internal_Sym *isymend;
6538 asection **ppsection;
6540 struct elf_backend_data *bed;
6541 boolean emit_relocs;
6542 struct elf_link_hash_entry **sym_hashes;
6544 output_bfd = finfo->output_bfd;
6545 bed = get_elf_backend_data (output_bfd);
6546 relocate_section = bed->elf_backend_relocate_section;
6548 /* If this is a dynamic object, we don't want to do anything here:
6549 we don't want the local symbols, and we don't want the section
6551 if ((input_bfd->flags & DYNAMIC) != 0)
6554 emit_relocs = (finfo->info->relocateable
6555 || finfo->info->emitrelocations
6556 || bed->elf_backend_emit_relocs);
6558 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
6559 if (elf_bad_symtab (input_bfd))
6561 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6566 locsymcount = symtab_hdr->sh_info;
6567 extsymoff = symtab_hdr->sh_info;
6570 /* Read the local symbols. */
6571 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
6572 if (isymbuf == NULL && locsymcount != 0)
6574 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
6575 finfo->internal_syms,
6576 finfo->external_syms,
6577 finfo->locsym_shndx);
6578 if (isymbuf == NULL)
6582 /* Find local symbol sections and adjust values of symbols in
6583 SEC_MERGE sections. Write out those local symbols we know are
6584 going into the output file. */
6585 isymend = isymbuf + locsymcount;
6586 for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections;
6588 isym++, pindex++, ppsection++)
6592 Elf_Internal_Sym osym;
6596 if (elf_bad_symtab (input_bfd))
6598 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
6605 if (isym->st_shndx == SHN_UNDEF)
6606 isec = bfd_und_section_ptr;
6607 else if (isym->st_shndx < SHN_LORESERVE
6608 || isym->st_shndx > SHN_HIRESERVE)
6610 isec = section_from_elf_index (input_bfd, isym->st_shndx);
6612 && elf_section_data (isec)->sec_info_type == ELF_INFO_TYPE_MERGE
6613 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
6615 _bfd_merged_section_offset (output_bfd, &isec,
6616 elf_section_data (isec)->sec_info,
6617 isym->st_value, (bfd_vma) 0);
6619 else if (isym->st_shndx == SHN_ABS)
6620 isec = bfd_abs_section_ptr;
6621 else if (isym->st_shndx == SHN_COMMON)
6622 isec = bfd_com_section_ptr;
6631 /* Don't output the first, undefined, symbol. */
6632 if (ppsection == finfo->sections)
6635 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
6637 /* We never output section symbols. Instead, we use the
6638 section symbol of the corresponding section in the output
6643 /* If we are stripping all symbols, we don't want to output this
6645 if (finfo->info->strip == strip_all)
6648 /* If we are discarding all local symbols, we don't want to
6649 output this one. If we are generating a relocateable output
6650 file, then some of the local symbols may be required by
6651 relocs; we output them below as we discover that they are
6653 if (finfo->info->discard == discard_all)
6656 /* If this symbol is defined in a section which we are
6657 discarding, we don't need to keep it, but note that
6658 linker_mark is only reliable for sections that have contents.
6659 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6660 as well as linker_mark. */
6661 if ((isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
6663 && ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
6664 || (! finfo->info->relocateable
6665 && (isec->flags & SEC_EXCLUDE) != 0)))
6668 /* Get the name of the symbol. */
6669 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
6674 /* See if we are discarding symbols with this name. */
6675 if ((finfo->info->strip == strip_some
6676 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
6678 || (((finfo->info->discard == discard_sec_merge
6679 && (isec->flags & SEC_MERGE) && ! finfo->info->relocateable)
6680 || finfo->info->discard == discard_l)
6681 && bfd_is_local_label_name (input_bfd, name)))
6684 /* If we get here, we are going to output this symbol. */
6688 /* Adjust the section index for the output file. */
6689 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
6690 isec->output_section);
6691 if (osym.st_shndx == SHN_BAD)
6694 *pindex = bfd_get_symcount (output_bfd);
6696 /* ELF symbols in relocateable files are section relative, but
6697 in executable files they are virtual addresses. Note that
6698 this code assumes that all ELF sections have an associated
6699 BFD section with a reasonable value for output_offset; below
6700 we assume that they also have a reasonable value for
6701 output_section. Any special sections must be set up to meet
6702 these requirements. */
6703 osym.st_value += isec->output_offset;
6704 if (! finfo->info->relocateable)
6706 osym.st_value += isec->output_section->vma;
6707 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
6709 /* STT_TLS symbols are relative to PT_TLS segment base. */
6710 BFD_ASSERT (finfo->first_tls_sec != NULL);
6711 osym.st_value -= finfo->first_tls_sec->vma;
6715 if (! elf_link_output_sym (finfo, name, &osym, isec))
6719 /* Relocate the contents of each section. */
6720 sym_hashes = elf_sym_hashes (input_bfd);
6721 for (o = input_bfd->sections; o != NULL; o = o->next)
6725 if (! o->linker_mark)
6727 /* This section was omitted from the link. */
6731 if ((o->flags & SEC_HAS_CONTENTS) == 0
6732 || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
6735 if ((o->flags & SEC_LINKER_CREATED) != 0)
6737 /* Section was created by elf_link_create_dynamic_sections
6742 /* Get the contents of the section. They have been cached by a
6743 relaxation routine. Note that o is a section in an input
6744 file, so the contents field will not have been set by any of
6745 the routines which work on output files. */
6746 if (elf_section_data (o)->this_hdr.contents != NULL)
6747 contents = elf_section_data (o)->this_hdr.contents;
6750 contents = finfo->contents;
6751 if (! bfd_get_section_contents (input_bfd, o, contents,
6752 (file_ptr) 0, o->_raw_size))
6756 if ((o->flags & SEC_RELOC) != 0)
6758 Elf_Internal_Rela *internal_relocs;
6760 /* Get the swapped relocs. */
6761 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
6762 (input_bfd, o, finfo->external_relocs,
6763 finfo->internal_relocs, false));
6764 if (internal_relocs == NULL
6765 && o->reloc_count > 0)
6768 /* Run through the relocs looking for any against symbols
6769 from discarded sections and section symbols from
6770 removed link-once sections. Complain about relocs
6771 against discarded sections. Zero relocs against removed
6772 link-once sections. We should really complain if
6773 anything in the final link tries to use it, but
6774 DWARF-based exception handling might have an entry in
6775 .eh_frame to describe a routine in the linkonce section,
6776 and it turns out to be hard to remove the .eh_frame
6777 entry too. FIXME. */
6778 if (!finfo->info->relocateable
6779 && !elf_section_ignore_discarded_relocs (o))
6781 Elf_Internal_Rela *rel, *relend;
6783 rel = internal_relocs;
6784 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
6785 for ( ; rel < relend; rel++)
6787 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
6789 if (r_symndx >= locsymcount
6790 || (elf_bad_symtab (input_bfd)
6791 && finfo->sections[r_symndx] == NULL))
6793 struct elf_link_hash_entry *h;
6795 h = sym_hashes[r_symndx - extsymoff];
6796 while (h->root.type == bfd_link_hash_indirect
6797 || h->root.type == bfd_link_hash_warning)
6798 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6800 /* Complain if the definition comes from a
6801 discarded section. */
6802 if ((h->root.type == bfd_link_hash_defined
6803 || h->root.type == bfd_link_hash_defweak)
6804 && elf_discarded_section (h->root.u.def.section))
6806 #if BFD_VERSION_DATE < 20031005
6807 if ((o->flags & SEC_DEBUGGING) != 0)
6809 #if BFD_VERSION_DATE > 20021005
6810 (*finfo->info->callbacks->warning)
6812 _("warning: relocation against removed section; zeroing"),
6813 NULL, input_bfd, o, rel->r_offset);
6815 BFD_ASSERT (r_symndx != 0);
6816 memset (rel, 0, sizeof (*rel));
6821 if (! ((*finfo->info->callbacks->undefined_symbol)
6822 (finfo->info, h->root.root.string,
6823 input_bfd, o, rel->r_offset,
6831 asection *sec = finfo->sections[r_symndx];
6833 if (sec != NULL && elf_discarded_section (sec))
6835 #if BFD_VERSION_DATE < 20031005
6836 if ((o->flags & SEC_DEBUGGING) != 0
6837 || (sec->flags & SEC_LINK_ONCE) != 0)
6839 #if BFD_VERSION_DATE > 20021005
6840 (*finfo->info->callbacks->warning)
6842 _("warning: relocation against removed section"),
6843 NULL, input_bfd, o, rel->r_offset);
6845 BFD_ASSERT (r_symndx != 0);
6847 = ELF_R_INFO (0, ELF_R_TYPE (rel->r_info));
6855 = _("local symbols in discarded section %s");
6857 = strlen (sec->name) + strlen (msg) - 1;
6858 char *buf = (char *) bfd_malloc (amt);
6861 sprintf (buf, msg, sec->name);
6863 buf = (char *) sec->name;
6864 ok = (*finfo->info->callbacks
6865 ->undefined_symbol) (finfo->info, buf,
6869 if (buf != sec->name)
6879 /* Relocate the section by invoking a back end routine.
6881 The back end routine is responsible for adjusting the
6882 section contents as necessary, and (if using Rela relocs
6883 and generating a relocateable output file) adjusting the
6884 reloc addend as necessary.
6886 The back end routine does not have to worry about setting
6887 the reloc address or the reloc symbol index.
6889 The back end routine is given a pointer to the swapped in
6890 internal symbols, and can access the hash table entries
6891 for the external symbols via elf_sym_hashes (input_bfd).
6893 When generating relocateable output, the back end routine
6894 must handle STB_LOCAL/STT_SECTION symbols specially. The
6895 output symbol is going to be a section symbol
6896 corresponding to the output section, which will require
6897 the addend to be adjusted. */
6899 if (! (*relocate_section) (output_bfd, finfo->info,
6900 input_bfd, o, contents,
6908 Elf_Internal_Rela *irela;
6909 Elf_Internal_Rela *irelaend;
6910 struct elf_link_hash_entry **rel_hash;
6911 Elf_Internal_Shdr *input_rel_hdr, *input_rel_hdr2;
6912 unsigned int next_erel;
6913 boolean (*reloc_emitter) PARAMS ((bfd *, asection *,
6914 Elf_Internal_Shdr *,
6915 Elf_Internal_Rela *));
6916 boolean rela_normal;
6918 input_rel_hdr = &elf_section_data (o)->rel_hdr;
6919 rela_normal = (bed->rela_normal
6920 && (input_rel_hdr->sh_entsize
6921 == sizeof (Elf_External_Rela)));
6923 /* Adjust the reloc addresses and symbol indices. */
6925 irela = internal_relocs;
6926 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
6927 rel_hash = (elf_section_data (o->output_section)->rel_hashes
6928 + elf_section_data (o->output_section)->rel_count
6929 + elf_section_data (o->output_section)->rel_count2);
6930 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
6932 unsigned long r_symndx;
6934 Elf_Internal_Sym sym;
6936 if (next_erel == bed->s->int_rels_per_ext_rel)
6942 irela->r_offset += o->output_offset;
6944 /* Relocs in an executable have to be virtual addresses. */
6945 if (!finfo->info->relocateable)
6946 irela->r_offset += o->output_section->vma;
6948 r_symndx = ELF_R_SYM (irela->r_info);
6953 if (r_symndx >= locsymcount
6954 || (elf_bad_symtab (input_bfd)
6955 && finfo->sections[r_symndx] == NULL))
6957 struct elf_link_hash_entry *rh;
6960 /* This is a reloc against a global symbol. We
6961 have not yet output all the local symbols, so
6962 we do not know the symbol index of any global
6963 symbol. We set the rel_hash entry for this
6964 reloc to point to the global hash table entry
6965 for this symbol. The symbol index is then
6966 set at the end of elf_bfd_final_link. */
6967 indx = r_symndx - extsymoff;
6968 rh = elf_sym_hashes (input_bfd)[indx];
6969 while (rh->root.type == bfd_link_hash_indirect
6970 || rh->root.type == bfd_link_hash_warning)
6971 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
6973 /* Setting the index to -2 tells
6974 elf_link_output_extsym that this symbol is
6976 BFD_ASSERT (rh->indx < 0);
6984 /* This is a reloc against a local symbol. */
6987 sym = isymbuf[r_symndx];
6988 sec = finfo->sections[r_symndx];
6989 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
6991 /* I suppose the backend ought to fill in the
6992 section of any STT_SECTION symbol against a
6993 processor specific section. If we have
6994 discarded a section, the output_section will
6995 be the absolute section. */
6996 if (bfd_is_abs_section (sec)
6998 && bfd_is_abs_section (sec->output_section)))
7000 else if (sec == NULL || sec->owner == NULL)
7002 bfd_set_error (bfd_error_bad_value);
7007 r_symndx = sec->output_section->target_index;
7008 BFD_ASSERT (r_symndx != 0);
7011 /* Adjust the addend according to where the
7012 section winds up in the output section. */
7014 irela->r_addend += sec->output_offset;
7018 if (finfo->indices[r_symndx] == -1)
7020 unsigned long shlink;
7024 if (finfo->info->strip == strip_all)
7026 /* You can't do ld -r -s. */
7027 bfd_set_error (bfd_error_invalid_operation);
7031 /* This symbol was skipped earlier, but
7032 since it is needed by a reloc, we
7033 must output it now. */
7034 shlink = symtab_hdr->sh_link;
7035 name = (bfd_elf_string_from_elf_section
7036 (input_bfd, shlink, sym.st_name));
7040 osec = sec->output_section;
7042 _bfd_elf_section_from_bfd_section (output_bfd,
7044 if (sym.st_shndx == SHN_BAD)
7047 sym.st_value += sec->output_offset;
7048 if (! finfo->info->relocateable)
7050 sym.st_value += osec->vma;
7051 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
7053 /* STT_TLS symbols are relative to PT_TLS
7055 BFD_ASSERT (finfo->first_tls_sec != NULL);
7056 sym.st_value -= finfo->first_tls_sec->vma;
7060 finfo->indices[r_symndx]
7061 = bfd_get_symcount (output_bfd);
7063 if (! elf_link_output_sym (finfo, name, &sym, sec))
7067 r_symndx = finfo->indices[r_symndx];
7070 irela->r_info = ELF_R_INFO (r_symndx,
7071 ELF_R_TYPE (irela->r_info));
7074 /* Swap out the relocs. */
7075 if (bed->elf_backend_emit_relocs
7076 && !(finfo->info->relocateable
7077 || finfo->info->emitrelocations))
7078 reloc_emitter = bed->elf_backend_emit_relocs;
7080 reloc_emitter = elf_link_output_relocs;
7082 if (input_rel_hdr->sh_size != 0
7083 && ! (*reloc_emitter) (output_bfd, o, input_rel_hdr,
7087 input_rel_hdr2 = elf_section_data (o)->rel_hdr2;
7088 if (input_rel_hdr2 && input_rel_hdr2->sh_size != 0)
7090 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
7091 * bed->s->int_rels_per_ext_rel);
7092 if (! (*reloc_emitter) (output_bfd, o, input_rel_hdr2,
7099 /* Write out the modified section contents. */
7100 if (bed->elf_backend_write_section
7101 && (*bed->elf_backend_write_section) (output_bfd, o, contents))
7103 /* Section written out. */
7105 else switch (elf_section_data (o)->sec_info_type)
7107 case ELF_INFO_TYPE_STABS:
7108 if (! (_bfd_write_section_stabs
7110 &elf_hash_table (finfo->info)->stab_info,
7111 o, &elf_section_data (o)->sec_info, contents)))
7114 case ELF_INFO_TYPE_MERGE:
7115 if (! (_bfd_write_merged_section
7116 (output_bfd, o, elf_section_data (o)->sec_info)))
7119 case ELF_INFO_TYPE_EH_FRAME:
7124 = bfd_get_section_by_name (elf_hash_table (finfo->info)->dynobj,
7126 if (! (_bfd_elf_write_section_eh_frame (output_bfd, o, ehdrsec,
7133 bfd_size_type sec_size;
7135 sec_size = (o->_cooked_size != 0 ? o->_cooked_size : o->_raw_size);
7136 if (! (o->flags & SEC_EXCLUDE)
7137 && ! bfd_set_section_contents (output_bfd, o->output_section,
7139 (file_ptr) o->output_offset,
7150 /* Generate a reloc when linking an ELF file. This is a reloc
7151 requested by the linker, and does come from any input file. This
7152 is used to build constructor and destructor tables when linking
7156 elf_reloc_link_order (output_bfd, info, output_section, link_order)
7158 struct bfd_link_info *info;
7159 asection *output_section;
7160 struct bfd_link_order *link_order;
7162 reloc_howto_type *howto;
7166 struct elf_link_hash_entry **rel_hash_ptr;
7167 Elf_Internal_Shdr *rel_hdr;
7168 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
7170 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
7173 bfd_set_error (bfd_error_bad_value);
7177 addend = link_order->u.reloc.p->addend;
7179 /* Figure out the symbol index. */
7180 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
7181 + elf_section_data (output_section)->rel_count
7182 + elf_section_data (output_section)->rel_count2);
7183 if (link_order->type == bfd_section_reloc_link_order)
7185 indx = link_order->u.reloc.p->u.section->target_index;
7186 BFD_ASSERT (indx != 0);
7187 *rel_hash_ptr = NULL;
7191 struct elf_link_hash_entry *h;
7193 /* Treat a reloc against a defined symbol as though it were
7194 actually against the section. */
7195 h = ((struct elf_link_hash_entry *)
7196 bfd_wrapped_link_hash_lookup (output_bfd, info,
7197 link_order->u.reloc.p->u.name,
7198 false, false, true));
7200 && (h->root.type == bfd_link_hash_defined
7201 || h->root.type == bfd_link_hash_defweak))
7205 section = h->root.u.def.section;
7206 indx = section->output_section->target_index;
7207 *rel_hash_ptr = NULL;
7208 /* It seems that we ought to add the symbol value to the
7209 addend here, but in practice it has already been added
7210 because it was passed to constructor_callback. */
7211 addend += section->output_section->vma + section->output_offset;
7215 /* Setting the index to -2 tells elf_link_output_extsym that
7216 this symbol is used by a reloc. */
7223 if (! ((*info->callbacks->unattached_reloc)
7224 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
7225 (asection *) NULL, (bfd_vma) 0)))
7231 /* If this is an inplace reloc, we must write the addend into the
7233 if (howto->partial_inplace && addend != 0)
7236 bfd_reloc_status_type rstat;
7239 const char *sym_name;
7241 size = bfd_get_reloc_size (howto);
7242 buf = (bfd_byte *) bfd_zmalloc (size);
7243 if (buf == (bfd_byte *) NULL)
7245 rstat = _bfd_relocate_contents (howto, output_bfd, (bfd_vma) addend, buf);
7252 case bfd_reloc_outofrange:
7255 case bfd_reloc_overflow:
7256 if (link_order->type == bfd_section_reloc_link_order)
7257 sym_name = bfd_section_name (output_bfd,
7258 link_order->u.reloc.p->u.section);
7260 sym_name = link_order->u.reloc.p->u.name;
7261 if (! ((*info->callbacks->reloc_overflow)
7262 (info, sym_name, howto->name, addend,
7263 (bfd *) NULL, (asection *) NULL, (bfd_vma) 0)))
7270 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
7271 (file_ptr) link_order->offset, size);
7277 /* The address of a reloc is relative to the section in a
7278 relocateable file, and is a virtual address in an executable
7280 offset = link_order->offset;
7281 if (! info->relocateable)
7282 offset += output_section->vma;
7284 rel_hdr = &elf_section_data (output_section)->rel_hdr;
7286 if (rel_hdr->sh_type == SHT_REL)
7289 Elf_Internal_Rel *irel;
7290 Elf_External_Rel *erel;
7293 size = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
7294 irel = (Elf_Internal_Rel *) bfd_zmalloc (size);
7298 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7299 irel[i].r_offset = offset;
7300 irel[0].r_info = ELF_R_INFO (indx, howto->type);
7302 erel = ((Elf_External_Rel *) rel_hdr->contents
7303 + elf_section_data (output_section)->rel_count);
7305 if (bed->s->swap_reloc_out)
7306 (*bed->s->swap_reloc_out) (output_bfd, irel, (bfd_byte *) erel);
7308 elf_swap_reloc_out (output_bfd, irel, erel);
7315 Elf_Internal_Rela *irela;
7316 Elf_External_Rela *erela;
7319 size = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
7320 irela = (Elf_Internal_Rela *) bfd_zmalloc (size);
7324 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7325 irela[i].r_offset = offset;
7326 irela[0].r_info = ELF_R_INFO (indx, howto->type);
7327 irela[0].r_addend = addend;
7329 erela = ((Elf_External_Rela *) rel_hdr->contents
7330 + elf_section_data (output_section)->rel_count);
7332 if (bed->s->swap_reloca_out)
7333 (*bed->s->swap_reloca_out) (output_bfd, irela, (bfd_byte *) erela);
7335 elf_swap_reloca_out (output_bfd, irela, erela);
7338 ++elf_section_data (output_section)->rel_count;
7343 /* Allocate a pointer to live in a linker created section. */
7346 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
7348 struct bfd_link_info *info;
7349 elf_linker_section_t *lsect;
7350 struct elf_link_hash_entry *h;
7351 const Elf_Internal_Rela *rel;
7353 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
7354 elf_linker_section_pointers_t *linker_section_ptr;
7355 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
7358 BFD_ASSERT (lsect != NULL);
7360 /* Is this a global symbol? */
7363 /* Has this symbol already been allocated? If so, our work is done. */
7364 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
7369 ptr_linker_section_ptr = &h->linker_section_pointer;
7370 /* Make sure this symbol is output as a dynamic symbol. */
7371 if (h->dynindx == -1)
7373 if (! elf_link_record_dynamic_symbol (info, h))
7377 if (lsect->rel_section)
7378 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
7382 /* Allocation of a pointer to a local symbol. */
7383 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
7385 /* Allocate a table to hold the local symbols if first time. */
7388 unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
7389 register unsigned int i;
7392 amt *= sizeof (elf_linker_section_pointers_t *);
7393 ptr = (elf_linker_section_pointers_t **) bfd_alloc (abfd, amt);
7398 elf_local_ptr_offsets (abfd) = ptr;
7399 for (i = 0; i < num_symbols; i++)
7400 ptr[i] = (elf_linker_section_pointers_t *) 0;
7403 /* Has this symbol already been allocated? If so, our work is done. */
7404 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
7409 ptr_linker_section_ptr = &ptr[r_symndx];
7413 /* If we are generating a shared object, we need to
7414 output a R_<xxx>_RELATIVE reloc so that the
7415 dynamic linker can adjust this GOT entry. */
7416 BFD_ASSERT (lsect->rel_section != NULL);
7417 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
7421 /* Allocate space for a pointer in the linker section, and allocate
7422 a new pointer record from internal memory. */
7423 BFD_ASSERT (ptr_linker_section_ptr != NULL);
7424 amt = sizeof (elf_linker_section_pointers_t);
7425 linker_section_ptr = (elf_linker_section_pointers_t *) bfd_alloc (abfd, amt);
7427 if (!linker_section_ptr)
7430 linker_section_ptr->next = *ptr_linker_section_ptr;
7431 linker_section_ptr->addend = rel->r_addend;
7432 linker_section_ptr->which = lsect->which;
7433 linker_section_ptr->written_address_p = false;
7434 *ptr_linker_section_ptr = linker_section_ptr;
7437 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
7439 linker_section_ptr->offset = (lsect->section->_raw_size
7440 - lsect->hole_size + (ARCH_SIZE / 8));
7441 lsect->hole_offset += ARCH_SIZE / 8;
7442 lsect->sym_offset += ARCH_SIZE / 8;
7443 if (lsect->sym_hash)
7445 /* Bump up symbol value if needed. */
7446 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
7448 fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
7449 lsect->sym_hash->root.root.string,
7450 (long) ARCH_SIZE / 8,
7451 (long) lsect->sym_hash->root.u.def.value);
7457 linker_section_ptr->offset = lsect->section->_raw_size;
7459 lsect->section->_raw_size += ARCH_SIZE / 8;
7463 "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
7464 lsect->name, (long) linker_section_ptr->offset,
7465 (long) lsect->section->_raw_size);
7472 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
7475 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
7478 /* Fill in the address for a pointer generated in a linker section. */
7481 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h,
7482 relocation, rel, relative_reloc)
7485 struct bfd_link_info *info;
7486 elf_linker_section_t *lsect;
7487 struct elf_link_hash_entry *h;
7489 const Elf_Internal_Rela *rel;
7492 elf_linker_section_pointers_t *linker_section_ptr;
7494 BFD_ASSERT (lsect != NULL);
7498 /* Handle global symbol. */
7499 linker_section_ptr = (_bfd_elf_find_pointer_linker_section
7500 (h->linker_section_pointer,
7504 BFD_ASSERT (linker_section_ptr != NULL);
7506 if (! elf_hash_table (info)->dynamic_sections_created
7509 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
7511 /* This is actually a static link, or it is a
7512 -Bsymbolic link and the symbol is defined
7513 locally. We must initialize this entry in the
7516 When doing a dynamic link, we create a .rela.<xxx>
7517 relocation entry to initialize the value. This
7518 is done in the finish_dynamic_symbol routine. */
7519 if (!linker_section_ptr->written_address_p)
7521 linker_section_ptr->written_address_p = true;
7522 bfd_put_ptr (output_bfd,
7523 relocation + linker_section_ptr->addend,
7524 (lsect->section->contents
7525 + linker_section_ptr->offset));
7531 /* Handle local symbol. */
7532 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
7533 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
7534 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
7535 linker_section_ptr = (_bfd_elf_find_pointer_linker_section
7536 (elf_local_ptr_offsets (input_bfd)[r_symndx],
7540 BFD_ASSERT (linker_section_ptr != NULL);
7542 /* Write out pointer if it hasn't been rewritten out before. */
7543 if (!linker_section_ptr->written_address_p)
7545 linker_section_ptr->written_address_p = true;
7546 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
7547 lsect->section->contents + linker_section_ptr->offset);
7551 asection *srel = lsect->rel_section;
7552 Elf_Internal_Rela *outrel;
7553 Elf_External_Rela *erel;
7554 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
7558 amt = sizeof (Elf_Internal_Rela) * bed->s->int_rels_per_ext_rel;
7559 outrel = (Elf_Internal_Rela *) bfd_zmalloc (amt);
7562 (*_bfd_error_handler) (_("Error: out of memory"));
7566 /* We need to generate a relative reloc for the dynamic
7570 srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
7572 lsect->rel_section = srel;
7575 BFD_ASSERT (srel != NULL);
7577 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7578 outrel[i].r_offset = (lsect->section->output_section->vma
7579 + lsect->section->output_offset
7580 + linker_section_ptr->offset);
7581 outrel[0].r_info = ELF_R_INFO (0, relative_reloc);
7582 outrel[0].r_addend = 0;
7583 erel = (Elf_External_Rela *) lsect->section->contents;
7584 erel += elf_section_data (lsect->section)->rel_count;
7585 elf_swap_reloca_out (output_bfd, outrel, erel);
7586 ++elf_section_data (lsect->section)->rel_count;
7593 relocation = (lsect->section->output_offset
7594 + linker_section_ptr->offset
7595 - lsect->hole_offset
7596 - lsect->sym_offset);
7600 "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
7601 lsect->name, (long) relocation, (long) relocation);
7604 /* Subtract out the addend, because it will get added back in by the normal
7606 return relocation - linker_section_ptr->addend;
7609 /* Garbage collect unused sections. */
7611 static boolean elf_gc_mark
7612 PARAMS ((struct bfd_link_info *, asection *,
7613 asection * (*) (asection *, struct bfd_link_info *,
7614 Elf_Internal_Rela *, struct elf_link_hash_entry *,
7615 Elf_Internal_Sym *)));
7617 static boolean elf_gc_sweep
7618 PARAMS ((struct bfd_link_info *,
7619 boolean (*) (bfd *, struct bfd_link_info *, asection *,
7620 const Elf_Internal_Rela *)));
7622 static boolean elf_gc_sweep_symbol
7623 PARAMS ((struct elf_link_hash_entry *, PTR));
7625 static boolean elf_gc_allocate_got_offsets
7626 PARAMS ((struct elf_link_hash_entry *, PTR));
7628 static boolean elf_gc_propagate_vtable_entries_used
7629 PARAMS ((struct elf_link_hash_entry *, PTR));
7631 static boolean elf_gc_smash_unused_vtentry_relocs
7632 PARAMS ((struct elf_link_hash_entry *, PTR));
7634 /* The mark phase of garbage collection. For a given section, mark
7635 it and any sections in this section's group, and all the sections
7636 which define symbols to which it refers. */
7639 elf_gc_mark (info, sec, gc_mark_hook)
7640 struct bfd_link_info *info;
7642 asection * (*gc_mark_hook) PARAMS ((asection *, struct bfd_link_info *,
7643 Elf_Internal_Rela *,
7644 struct elf_link_hash_entry *,
7645 Elf_Internal_Sym *));
7648 asection *group_sec;
7652 /* Mark all the sections in the group. */
7653 group_sec = elf_section_data (sec)->next_in_group;
7654 if (group_sec && !group_sec->gc_mark)
7655 if (!elf_gc_mark (info, group_sec, gc_mark_hook))
7658 /* Look through the section relocs. */
7660 if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
7662 Elf_Internal_Rela *relstart, *rel, *relend;
7663 Elf_Internal_Shdr *symtab_hdr;
7664 struct elf_link_hash_entry **sym_hashes;
7667 bfd *input_bfd = sec->owner;
7668 struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
7669 Elf_Internal_Sym *isym = NULL;
7671 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
7672 sym_hashes = elf_sym_hashes (input_bfd);
7674 /* Read the local symbols. */
7675 if (elf_bad_symtab (input_bfd))
7677 nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
7681 extsymoff = nlocsyms = symtab_hdr->sh_info;
7683 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
7684 if (isym == NULL && nlocsyms != 0)
7686 isym = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, nlocsyms, 0,
7692 /* Read the relocations. */
7693 relstart = (NAME(_bfd_elf,link_read_relocs)
7694 (input_bfd, sec, NULL, (Elf_Internal_Rela *) NULL,
7695 info->keep_memory));
7696 if (relstart == NULL)
7701 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
7703 for (rel = relstart; rel < relend; rel++)
7705 unsigned long r_symndx;
7707 struct elf_link_hash_entry *h;
7709 r_symndx = ELF_R_SYM (rel->r_info);
7713 if (r_symndx >= nlocsyms
7714 || ELF_ST_BIND (isym[r_symndx].st_info) != STB_LOCAL)
7716 h = sym_hashes[r_symndx - extsymoff];
7717 rsec = (*gc_mark_hook) (sec, info, rel, h, NULL);
7721 rsec = (*gc_mark_hook) (sec, info, rel, NULL, &isym[r_symndx]);
7724 if (rsec && !rsec->gc_mark)
7726 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
7728 else if (!elf_gc_mark (info, rsec, gc_mark_hook))
7737 if (elf_section_data (sec)->relocs != relstart)
7740 if (isym != NULL && symtab_hdr->contents != (unsigned char *) isym)
7742 if (! info->keep_memory)
7745 symtab_hdr->contents = (unsigned char *) isym;
7752 /* The sweep phase of garbage collection. Remove all garbage sections. */
7755 elf_gc_sweep (info, gc_sweep_hook)
7756 struct bfd_link_info *info;
7757 boolean (*gc_sweep_hook) PARAMS ((bfd *, struct bfd_link_info *,
7758 asection *, const Elf_Internal_Rela *));
7762 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
7766 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
7769 for (o = sub->sections; o != NULL; o = o->next)
7771 /* Keep special sections. Keep .debug sections. */
7772 if ((o->flags & SEC_LINKER_CREATED)
7773 || (o->flags & SEC_DEBUGGING))
7779 /* Skip sweeping sections already excluded. */
7780 if (o->flags & SEC_EXCLUDE)
7783 /* Since this is early in the link process, it is simple
7784 to remove a section from the output. */
7785 o->flags |= SEC_EXCLUDE;
7787 /* But we also have to update some of the relocation
7788 info we collected before. */
7790 && (o->flags & SEC_RELOC) && o->reloc_count > 0)
7792 Elf_Internal_Rela *internal_relocs;
7795 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
7796 (o->owner, o, NULL, NULL, info->keep_memory));
7797 if (internal_relocs == NULL)
7800 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
7802 if (elf_section_data (o)->relocs != internal_relocs)
7803 free (internal_relocs);
7811 /* Remove the symbols that were in the swept sections from the dynamic
7812 symbol table. GCFIXME: Anyone know how to get them out of the
7813 static symbol table as well? */
7817 elf_link_hash_traverse (elf_hash_table (info),
7818 elf_gc_sweep_symbol,
7821 elf_hash_table (info)->dynsymcount = i;
7827 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
7830 elf_gc_sweep_symbol (h, idxptr)
7831 struct elf_link_hash_entry *h;
7834 int *idx = (int *) idxptr;
7836 if (h->root.type == bfd_link_hash_warning)
7837 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7839 if (h->dynindx != -1
7840 && ((h->root.type != bfd_link_hash_defined
7841 && h->root.type != bfd_link_hash_defweak)
7842 || h->root.u.def.section->gc_mark))
7843 h->dynindx = (*idx)++;
7848 /* Propogate collected vtable information. This is called through
7849 elf_link_hash_traverse. */
7852 elf_gc_propagate_vtable_entries_used (h, okp)
7853 struct elf_link_hash_entry *h;
7856 if (h->root.type == bfd_link_hash_warning)
7857 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7859 /* Those that are not vtables. */
7860 if (h->vtable_parent == NULL)
7863 /* Those vtables that do not have parents, we cannot merge. */
7864 if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
7867 /* If we've already been done, exit. */
7868 if (h->vtable_entries_used && h->vtable_entries_used[-1])
7871 /* Make sure the parent's table is up to date. */
7872 elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
7874 if (h->vtable_entries_used == NULL)
7876 /* None of this table's entries were referenced. Re-use the
7878 h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
7879 h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
7886 /* Or the parent's entries into ours. */
7887 cu = h->vtable_entries_used;
7889 pu = h->vtable_parent->vtable_entries_used;
7892 asection *sec = h->root.u.def.section;
7893 struct elf_backend_data *bed = get_elf_backend_data (sec->owner);
7894 int file_align = bed->s->file_align;
7896 n = h->vtable_parent->vtable_entries_size / file_align;
7911 elf_gc_smash_unused_vtentry_relocs (h, okp)
7912 struct elf_link_hash_entry *h;
7916 bfd_vma hstart, hend;
7917 Elf_Internal_Rela *relstart, *relend, *rel;
7918 struct elf_backend_data *bed;
7921 if (h->root.type == bfd_link_hash_warning)
7922 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7924 /* Take care of both those symbols that do not describe vtables as
7925 well as those that are not loaded. */
7926 if (h->vtable_parent == NULL)
7929 BFD_ASSERT (h->root.type == bfd_link_hash_defined
7930 || h->root.type == bfd_link_hash_defweak);
7932 sec = h->root.u.def.section;
7933 hstart = h->root.u.def.value;
7934 hend = hstart + h->size;
7936 relstart = (NAME(_bfd_elf,link_read_relocs)
7937 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true));
7939 return *(boolean *) okp = false;
7940 bed = get_elf_backend_data (sec->owner);
7941 file_align = bed->s->file_align;
7943 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
7945 for (rel = relstart; rel < relend; ++rel)
7946 if (rel->r_offset >= hstart && rel->r_offset < hend)
7948 /* If the entry is in use, do nothing. */
7949 if (h->vtable_entries_used
7950 && (rel->r_offset - hstart) < h->vtable_entries_size)
7952 bfd_vma entry = (rel->r_offset - hstart) / file_align;
7953 if (h->vtable_entries_used[entry])
7956 /* Otherwise, kill it. */
7957 rel->r_offset = rel->r_info = rel->r_addend = 0;
7963 /* Do mark and sweep of unused sections. */
7966 elf_gc_sections (abfd, info)
7968 struct bfd_link_info *info;
7972 asection * (*gc_mark_hook)
7973 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
7974 struct elf_link_hash_entry *h, Elf_Internal_Sym *));
7976 if (!get_elf_backend_data (abfd)->can_gc_sections
7977 || info->relocateable || info->emitrelocations
7978 || elf_hash_table (info)->dynamic_sections_created)
7981 /* Apply transitive closure to the vtable entry usage info. */
7982 elf_link_hash_traverse (elf_hash_table (info),
7983 elf_gc_propagate_vtable_entries_used,
7988 /* Kill the vtable relocations that were not used. */
7989 elf_link_hash_traverse (elf_hash_table (info),
7990 elf_gc_smash_unused_vtentry_relocs,
7995 /* Grovel through relocs to find out who stays ... */
7997 gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
7998 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
8002 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
8005 for (o = sub->sections; o != NULL; o = o->next)
8007 if (o->flags & SEC_KEEP)
8008 if (!elf_gc_mark (info, o, gc_mark_hook))
8013 /* ... and mark SEC_EXCLUDE for those that go. */
8014 if (!elf_gc_sweep (info, get_elf_backend_data (abfd)->gc_sweep_hook))
8020 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
8023 elf_gc_record_vtinherit (abfd, sec, h, offset)
8026 struct elf_link_hash_entry *h;
8029 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
8030 struct elf_link_hash_entry **search, *child;
8031 bfd_size_type extsymcount;
8033 /* The sh_info field of the symtab header tells us where the
8034 external symbols start. We don't care about the local symbols at
8036 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
8037 if (!elf_bad_symtab (abfd))
8038 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
8040 sym_hashes = elf_sym_hashes (abfd);
8041 sym_hashes_end = sym_hashes + extsymcount;
8043 /* Hunt down the child symbol, which is in this section at the same
8044 offset as the relocation. */
8045 for (search = sym_hashes; search != sym_hashes_end; ++search)
8047 if ((child = *search) != NULL
8048 && (child->root.type == bfd_link_hash_defined
8049 || child->root.type == bfd_link_hash_defweak)
8050 && child->root.u.def.section == sec
8051 && child->root.u.def.value == offset)
8055 (*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
8056 bfd_archive_filename (abfd), sec->name,
8057 (unsigned long) offset);
8058 bfd_set_error (bfd_error_invalid_operation);
8064 /* This *should* only be the absolute section. It could potentially
8065 be that someone has defined a non-global vtable though, which
8066 would be bad. It isn't worth paging in the local symbols to be
8067 sure though; that case should simply be handled by the assembler. */
8069 child->vtable_parent = (struct elf_link_hash_entry *) -1;
8072 child->vtable_parent = h;
8077 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
8080 elf_gc_record_vtentry (abfd, sec, h, addend)
8081 bfd *abfd ATTRIBUTE_UNUSED;
8082 asection *sec ATTRIBUTE_UNUSED;
8083 struct elf_link_hash_entry *h;
8086 struct elf_backend_data *bed = get_elf_backend_data (abfd);
8087 int file_align = bed->s->file_align;
8089 if (addend >= h->vtable_entries_size)
8092 boolean *ptr = h->vtable_entries_used;
8094 /* While the symbol is undefined, we have to be prepared to handle
8096 if (h->root.type == bfd_link_hash_undefined)
8103 /* Oops! We've got a reference past the defined end of
8104 the table. This is probably a bug -- shall we warn? */
8109 /* Allocate one extra entry for use as a "done" flag for the
8110 consolidation pass. */
8111 bytes = (size / file_align + 1) * sizeof (boolean);
8115 ptr = bfd_realloc (ptr - 1, (bfd_size_type) bytes);
8121 oldbytes = ((h->vtable_entries_size / file_align + 1)
8122 * sizeof (boolean));
8123 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
8127 ptr = bfd_zmalloc ((bfd_size_type) bytes);
8132 /* And arrange for that done flag to be at index -1. */
8133 h->vtable_entries_used = ptr + 1;
8134 h->vtable_entries_size = size;
8137 h->vtable_entries_used[addend / file_align] = true;
8142 /* And an accompanying bit to work out final got entry offsets once
8143 we're done. Should be called from final_link. */
8146 elf_gc_common_finalize_got_offsets (abfd, info)
8148 struct bfd_link_info *info;
8151 struct elf_backend_data *bed = get_elf_backend_data (abfd);
8154 /* The GOT offset is relative to the .got section, but the GOT header is
8155 put into the .got.plt section, if the backend uses it. */
8156 if (bed->want_got_plt)
8159 gotoff = bed->got_header_size;
8161 /* Do the local .got entries first. */
8162 for (i = info->input_bfds; i; i = i->link_next)
8164 bfd_signed_vma *local_got;
8165 bfd_size_type j, locsymcount;
8166 Elf_Internal_Shdr *symtab_hdr;
8168 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
8171 local_got = elf_local_got_refcounts (i);
8175 symtab_hdr = &elf_tdata (i)->symtab_hdr;
8176 if (elf_bad_symtab (i))
8177 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
8179 locsymcount = symtab_hdr->sh_info;
8181 for (j = 0; j < locsymcount; ++j)
8183 if (local_got[j] > 0)
8185 local_got[j] = gotoff;
8186 gotoff += ARCH_SIZE / 8;
8189 local_got[j] = (bfd_vma) -1;
8193 /* Then the global .got entries. .plt refcounts are handled by
8194 adjust_dynamic_symbol */
8195 elf_link_hash_traverse (elf_hash_table (info),
8196 elf_gc_allocate_got_offsets,
8201 /* We need a special top-level link routine to convert got reference counts
8202 to real got offsets. */
8205 elf_gc_allocate_got_offsets (h, offarg)
8206 struct elf_link_hash_entry *h;
8209 bfd_vma *off = (bfd_vma *) offarg;
8211 if (h->root.type == bfd_link_hash_warning)
8212 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8214 if (h->got.refcount > 0)
8216 h->got.offset = off[0];
8217 off[0] += ARCH_SIZE / 8;
8220 h->got.offset = (bfd_vma) -1;
8225 /* Many folk need no more in the way of final link than this, once
8226 got entry reference counting is enabled. */
8229 elf_gc_common_final_link (abfd, info)
8231 struct bfd_link_info *info;
8233 if (!elf_gc_common_finalize_got_offsets (abfd, info))
8236 /* Invoke the regular ELF backend linker to do all the work. */
8237 return elf_bfd_final_link (abfd, info);
8240 /* This function will be called though elf_link_hash_traverse to store
8241 all hash value of the exported symbols in an array. */
8244 elf_collect_hash_codes (h, data)
8245 struct elf_link_hash_entry *h;
8248 unsigned long **valuep = (unsigned long **) data;
8254 if (h->root.type == bfd_link_hash_warning)
8255 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8257 /* Ignore indirect symbols. These are added by the versioning code. */
8258 if (h->dynindx == -1)
8261 name = h->root.root.string;
8262 p = strchr (name, ELF_VER_CHR);
8265 alc = bfd_malloc ((bfd_size_type) (p - name + 1));
8266 memcpy (alc, name, (size_t) (p - name));
8267 alc[p - name] = '\0';
8271 /* Compute the hash value. */
8272 ha = bfd_elf_hash (name);
8274 /* Store the found hash value in the array given as the argument. */
8277 /* And store it in the struct so that we can put it in the hash table
8279 h->elf_hash_value = ha;
8288 elf_reloc_symbol_deleted_p (offset, cookie)
8292 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
8294 if (rcookie->bad_symtab)
8295 rcookie->rel = rcookie->rels;
8297 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
8299 unsigned long r_symndx = ELF_R_SYM (rcookie->rel->r_info);
8301 if (! rcookie->bad_symtab)
8302 if (rcookie->rel->r_offset > offset)
8304 if (rcookie->rel->r_offset != offset)
8307 if (r_symndx >= rcookie->locsymcount
8308 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
8310 struct elf_link_hash_entry *h;
8312 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
8314 while (h->root.type == bfd_link_hash_indirect
8315 || h->root.type == bfd_link_hash_warning)
8316 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8318 if ((h->root.type == bfd_link_hash_defined
8319 || h->root.type == bfd_link_hash_defweak)
8320 && elf_discarded_section (h->root.u.def.section))
8327 /* It's not a relocation against a global symbol,
8328 but it could be a relocation against a local
8329 symbol for a discarded section. */
8331 Elf_Internal_Sym *isym;
8333 /* Need to: get the symbol; get the section. */
8334 isym = &rcookie->locsyms[r_symndx];
8335 if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
8337 isec = section_from_elf_index (rcookie->abfd, isym->st_shndx);
8338 if (isec != NULL && elf_discarded_section (isec))
8347 /* Discard unneeded references to discarded sections.
8348 Returns true if any section's size was changed. */
8349 /* This function assumes that the relocations are in sorted order,
8350 which is true for all known assemblers. */
8353 elf_bfd_discard_info (output_bfd, info)
8355 struct bfd_link_info *info;
8357 struct elf_reloc_cookie cookie;
8358 asection *stab, *eh, *ehdr;
8359 Elf_Internal_Shdr *symtab_hdr;
8360 struct elf_backend_data *bed;
8362 boolean ret = false;
8363 boolean strip = info->strip == strip_all || info->strip == strip_debugger;
8365 if (info->relocateable
8366 || info->traditional_format
8367 || info->hash->creator->flavour != bfd_target_elf_flavour
8368 || ! is_elf_hash_table (info))
8372 if (elf_hash_table (info)->dynobj != NULL)
8373 ehdr = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
8376 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
8378 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
8381 bed = get_elf_backend_data (abfd);
8383 if ((abfd->flags & DYNAMIC) != 0)
8389 eh = bfd_get_section_by_name (abfd, ".eh_frame");
8390 if (eh && (eh->_raw_size == 0
8391 || bfd_is_abs_section (eh->output_section)))
8398 stab = bfd_get_section_by_name (abfd, ".stab");
8399 if (stab && (stab->_raw_size == 0
8400 || bfd_is_abs_section (stab->output_section)))
8404 || elf_section_data(stab)->sec_info_type != ELF_INFO_TYPE_STABS)
8406 && (strip || ! bed->elf_backend_discard_info))
8409 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8411 cookie.sym_hashes = elf_sym_hashes (abfd);
8412 cookie.bad_symtab = elf_bad_symtab (abfd);
8413 if (cookie.bad_symtab)
8415 cookie.locsymcount =
8416 symtab_hdr->sh_size / sizeof (Elf_External_Sym);
8417 cookie.extsymoff = 0;
8421 cookie.locsymcount = symtab_hdr->sh_info;
8422 cookie.extsymoff = symtab_hdr->sh_info;
8425 cookie.locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
8426 if (cookie.locsyms == NULL && cookie.locsymcount != 0)
8428 cookie.locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
8429 cookie.locsymcount, 0,
8431 if (cookie.locsyms == NULL)
8437 cookie.rels = (NAME(_bfd_elf,link_read_relocs)
8438 (abfd, stab, (PTR) NULL, (Elf_Internal_Rela *) NULL,
8439 info->keep_memory));
8442 cookie.rel = cookie.rels;
8444 cookie.rels + stab->reloc_count * bed->s->int_rels_per_ext_rel;
8445 if (_bfd_discard_section_stabs (abfd, stab,
8446 elf_section_data (stab)->sec_info,
8447 elf_reloc_symbol_deleted_p,
8450 if (elf_section_data (stab)->relocs != cookie.rels)
8459 cookie.relend = NULL;
8460 if (eh->reloc_count)
8461 cookie.rels = (NAME(_bfd_elf,link_read_relocs)
8462 (abfd, eh, (PTR) NULL, (Elf_Internal_Rela *) NULL,
8463 info->keep_memory));
8466 cookie.rel = cookie.rels;
8468 cookie.rels + eh->reloc_count * bed->s->int_rels_per_ext_rel;
8470 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh, ehdr,
8471 elf_reloc_symbol_deleted_p,
8474 if (cookie.rels && elf_section_data (eh)->relocs != cookie.rels)
8478 if (bed->elf_backend_discard_info)
8480 if (bed->elf_backend_discard_info (abfd, &cookie, info))
8484 if (cookie.locsyms != NULL
8485 && symtab_hdr->contents != (unsigned char *) cookie.locsyms)
8487 if (! info->keep_memory)
8488 free (cookie.locsyms);
8490 symtab_hdr->contents = (unsigned char *) cookie.locsyms;
8494 if (ehdr && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info, ehdr))
8500 elf_section_ignore_discarded_relocs (sec)
8503 struct elf_backend_data *bed;
8505 switch (elf_section_data (sec)->sec_info_type)
8507 case ELF_INFO_TYPE_STABS:
8508 case ELF_INFO_TYPE_EH_FRAME:
8514 bed = get_elf_backend_data (sec->owner);
8515 if (bed->elf_backend_ignore_discarded_relocs != NULL
8516 && (*bed->elf_backend_ignore_discarded_relocs) (sec))