2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001
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;
32 static boolean elf_link_add_object_symbols
33 PARAMS ((bfd *, struct bfd_link_info *));
34 static boolean elf_link_add_archive_symbols
35 PARAMS ((bfd *, struct bfd_link_info *));
36 static boolean elf_merge_symbol
37 PARAMS ((bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
38 asection **, bfd_vma *, struct elf_link_hash_entry **,
39 boolean *, boolean *, boolean *, boolean));
40 static boolean elf_export_symbol
41 PARAMS ((struct elf_link_hash_entry *, PTR));
42 static boolean elf_fix_symbol_flags
43 PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *));
44 static boolean elf_adjust_dynamic_symbol
45 PARAMS ((struct elf_link_hash_entry *, PTR));
46 static boolean elf_link_find_version_dependencies
47 PARAMS ((struct elf_link_hash_entry *, PTR));
48 static boolean elf_link_find_version_dependencies
49 PARAMS ((struct elf_link_hash_entry *, PTR));
50 static boolean elf_link_assign_sym_version
51 PARAMS ((struct elf_link_hash_entry *, PTR));
52 static boolean elf_collect_hash_codes
53 PARAMS ((struct elf_link_hash_entry *, PTR));
54 static boolean elf_link_read_relocs_from_section
55 PARAMS ((bfd *, Elf_Internal_Shdr *, PTR, Elf_Internal_Rela *));
56 static void elf_link_output_relocs
57 PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *));
58 static boolean elf_link_size_reloc_section
59 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
60 static void elf_link_adjust_relocs
61 PARAMS ((bfd *, Elf_Internal_Shdr *, unsigned int,
62 struct elf_link_hash_entry **));
64 /* Given an ELF BFD, add symbols to the global hash table as
68 elf_bfd_link_add_symbols (abfd, info)
70 struct bfd_link_info *info;
72 switch (bfd_get_format (abfd))
75 return elf_link_add_object_symbols (abfd, info);
77 return elf_link_add_archive_symbols (abfd, info);
79 bfd_set_error (bfd_error_wrong_format);
84 /* Return true iff this is a non-common, definition of a non-function symbol. */
86 is_global_data_symbol_definition (abfd, sym)
87 bfd * abfd ATTRIBUTE_UNUSED;
88 Elf_Internal_Sym * sym;
90 /* Local symbols do not count, but target specific ones might. */
91 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
92 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
95 /* Function symbols do not count. */
96 if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
99 /* If the section is undefined, then so is the symbol. */
100 if (sym->st_shndx == SHN_UNDEF)
103 /* If the symbol is defined in the common section, then
104 it is a common definition and so does not count. */
105 if (sym->st_shndx == SHN_COMMON)
108 /* If the symbol is in a target specific section then we
109 must rely upon the backend to tell us what it is. */
110 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
111 /* FIXME - this function is not coded yet:
113 return _bfd_is_global_symbol_definition (abfd, sym);
115 Instead for now assume that the definition is not global,
116 Even if this is wrong, at least the linker will behave
117 in the same way that it used to do. */
123 /* Search the symbol table of the archive element of the archive ABFD
124 whoes archive map contains a mention of SYMDEF, and determine if
125 the symbol is defined in this element. */
127 elf_link_is_defined_archive_symbol (abfd, symdef)
131 Elf_Internal_Shdr * hdr;
132 Elf_External_Sym * esym;
133 Elf_External_Sym * esymend;
134 Elf_External_Sym * buf = NULL;
138 boolean result = false;
140 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
141 if (abfd == (bfd *) NULL)
144 if (! bfd_check_format (abfd, bfd_object))
147 /* If we have already included the element containing this symbol in the
148 link then we do not need to include it again. Just claim that any symbol
149 it contains is not a definition, so that our caller will not decide to
150 (re)include this element. */
151 if (abfd->archive_pass)
154 /* Select the appropriate symbol table. */
155 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
156 hdr = &elf_tdata (abfd)->symtab_hdr;
158 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
160 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
162 /* The sh_info field of the symtab header tells us where the
163 external symbols start. We don't care about the local symbols. */
164 if (elf_bad_symtab (abfd))
166 extsymcount = symcount;
171 extsymcount = symcount - hdr->sh_info;
172 extsymoff = hdr->sh_info;
175 buf = ((Elf_External_Sym *)
176 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
177 if (buf == NULL && extsymcount != 0)
180 /* Read in the symbol table.
181 FIXME: This ought to be cached somewhere. */
183 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
185 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
186 != extsymcount * sizeof (Elf_External_Sym)))
192 /* Scan the symbol table looking for SYMDEF. */
193 esymend = buf + extsymcount;
198 Elf_Internal_Sym sym;
201 elf_swap_symbol_in (abfd, esym, & sym);
203 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
204 if (name == (const char *) NULL)
207 if (strcmp (name, symdef->name) == 0)
209 result = is_global_data_symbol_definition (abfd, & sym);
219 /* Add symbols from an ELF archive file to the linker hash table. We
220 don't use _bfd_generic_link_add_archive_symbols because of a
221 problem which arises on UnixWare. The UnixWare libc.so is an
222 archive which includes an entry libc.so.1 which defines a bunch of
223 symbols. The libc.so archive also includes a number of other
224 object files, which also define symbols, some of which are the same
225 as those defined in libc.so.1. Correct linking requires that we
226 consider each object file in turn, and include it if it defines any
227 symbols we need. _bfd_generic_link_add_archive_symbols does not do
228 this; it looks through the list of undefined symbols, and includes
229 any object file which defines them. When this algorithm is used on
230 UnixWare, it winds up pulling in libc.so.1 early and defining a
231 bunch of symbols. This means that some of the other objects in the
232 archive are not included in the link, which is incorrect since they
233 precede libc.so.1 in the archive.
235 Fortunately, ELF archive handling is simpler than that done by
236 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
237 oddities. In ELF, if we find a symbol in the archive map, and the
238 symbol is currently undefined, we know that we must pull in that
241 Unfortunately, we do have to make multiple passes over the symbol
242 table until nothing further is resolved. */
245 elf_link_add_archive_symbols (abfd, info)
247 struct bfd_link_info *info;
250 boolean *defined = NULL;
251 boolean *included = NULL;
255 if (! bfd_has_map (abfd))
257 /* An empty archive is a special case. */
258 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
260 bfd_set_error (bfd_error_no_armap);
264 /* Keep track of all symbols we know to be already defined, and all
265 files we know to be already included. This is to speed up the
266 second and subsequent passes. */
267 c = bfd_ardata (abfd)->symdef_count;
270 defined = (boolean *) bfd_malloc (c * sizeof (boolean));
271 included = (boolean *) bfd_malloc (c * sizeof (boolean));
272 if (defined == (boolean *) NULL || included == (boolean *) NULL)
274 memset (defined, 0, c * sizeof (boolean));
275 memset (included, 0, c * sizeof (boolean));
277 symdefs = bfd_ardata (abfd)->symdefs;
290 symdefend = symdef + c;
291 for (i = 0; symdef < symdefend; symdef++, i++)
293 struct elf_link_hash_entry *h;
295 struct bfd_link_hash_entry *undefs_tail;
298 if (defined[i] || included[i])
300 if (symdef->file_offset == last)
306 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
307 false, false, false);
313 /* If this is a default version (the name contains @@),
314 look up the symbol again without the version. The
315 effect is that references to the symbol without the
316 version will be matched by the default symbol in the
319 p = strchr (symdef->name, ELF_VER_CHR);
320 if (p == NULL || p[1] != ELF_VER_CHR)
323 copy = bfd_alloc (abfd, p - symdef->name + 1);
326 memcpy (copy, symdef->name, p - symdef->name);
327 copy[p - symdef->name] = '\0';
329 h = elf_link_hash_lookup (elf_hash_table (info), copy,
330 false, false, false);
332 bfd_release (abfd, copy);
338 if (h->root.type == bfd_link_hash_common)
340 /* We currently have a common symbol. The archive map contains
341 a reference to this symbol, so we may want to include it. We
342 only want to include it however, if this archive element
343 contains a definition of the symbol, not just another common
346 Unfortunately some archivers (including GNU ar) will put
347 declarations of common symbols into their archive maps, as
348 well as real definitions, so we cannot just go by the archive
349 map alone. Instead we must read in the element's symbol
350 table and check that to see what kind of symbol definition
352 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
355 else if (h->root.type != bfd_link_hash_undefined)
357 if (h->root.type != bfd_link_hash_undefweak)
362 /* We need to include this archive member. */
363 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
364 if (element == (bfd *) NULL)
367 if (! bfd_check_format (element, bfd_object))
370 /* Doublecheck that we have not included this object
371 already--it should be impossible, but there may be
372 something wrong with the archive. */
373 if (element->archive_pass != 0)
375 bfd_set_error (bfd_error_bad_value);
378 element->archive_pass = 1;
380 undefs_tail = info->hash->undefs_tail;
382 if (! (*info->callbacks->add_archive_element) (info, element,
385 if (! elf_link_add_object_symbols (element, info))
388 /* If there are any new undefined symbols, we need to make
389 another pass through the archive in order to see whether
390 they can be defined. FIXME: This isn't perfect, because
391 common symbols wind up on undefs_tail and because an
392 undefined symbol which is defined later on in this pass
393 does not require another pass. This isn't a bug, but it
394 does make the code less efficient than it could be. */
395 if (undefs_tail != info->hash->undefs_tail)
398 /* Look backward to mark all symbols from this object file
399 which we have already seen in this pass. */
403 included[mark] = true;
408 while (symdefs[mark].file_offset == symdef->file_offset);
410 /* We mark subsequent symbols from this object file as we go
411 on through the loop. */
412 last = symdef->file_offset;
423 if (defined != (boolean *) NULL)
425 if (included != (boolean *) NULL)
430 /* This function is called when we want to define a new symbol. It
431 handles the various cases which arise when we find a definition in
432 a dynamic object, or when there is already a definition in a
433 dynamic object. The new symbol is described by NAME, SYM, PSEC,
434 and PVALUE. We set SYM_HASH to the hash table entry. We set
435 OVERRIDE if the old symbol is overriding a new definition. We set
436 TYPE_CHANGE_OK if it is OK for the type to change. We set
437 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
438 change, we mean that we shouldn't warn if the type or size does
439 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
443 elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash,
444 override, type_change_ok, size_change_ok, dt_needed)
446 struct bfd_link_info *info;
448 Elf_Internal_Sym *sym;
451 struct elf_link_hash_entry **sym_hash;
453 boolean *type_change_ok;
454 boolean *size_change_ok;
458 struct elf_link_hash_entry *h;
461 boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
466 bind = ELF_ST_BIND (sym->st_info);
468 if (! bfd_is_und_section (sec))
469 h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false);
471 h = ((struct elf_link_hash_entry *)
472 bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false));
477 /* This code is for coping with dynamic objects, and is only useful
478 if we are doing an ELF link. */
479 if (info->hash->creator != abfd->xvec)
482 /* For merging, we only care about real symbols. */
484 while (h->root.type == bfd_link_hash_indirect
485 || h->root.type == bfd_link_hash_warning)
486 h = (struct elf_link_hash_entry *) h->root.u.i.link;
488 /* If we just created the symbol, mark it as being an ELF symbol.
489 Other than that, there is nothing to do--there is no merge issue
490 with a newly defined symbol--so we just return. */
492 if (h->root.type == bfd_link_hash_new)
494 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
498 /* OLDBFD is a BFD associated with the existing symbol. */
500 switch (h->root.type)
506 case bfd_link_hash_undefined:
507 case bfd_link_hash_undefweak:
508 oldbfd = h->root.u.undef.abfd;
511 case bfd_link_hash_defined:
512 case bfd_link_hash_defweak:
513 oldbfd = h->root.u.def.section->owner;
516 case bfd_link_hash_common:
517 oldbfd = h->root.u.c.p->section->owner;
521 /* In cases involving weak versioned symbols, we may wind up trying
522 to merge a symbol with itself. Catch that here, to avoid the
523 confusion that results if we try to override a symbol with
524 itself. The additional tests catch cases like
525 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
526 dynamic object, which we do want to handle here. */
528 && ((abfd->flags & DYNAMIC) == 0
529 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))
532 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
533 respectively, is from a dynamic object. */
535 if ((abfd->flags & DYNAMIC) != 0)
541 olddyn = (oldbfd->flags & DYNAMIC) != 0;
546 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
547 indices used by MIPS ELF. */
548 switch (h->root.type)
554 case bfd_link_hash_defined:
555 case bfd_link_hash_defweak:
556 hsec = h->root.u.def.section;
559 case bfd_link_hash_common:
560 hsec = h->root.u.c.p->section;
567 olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0;
570 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
571 respectively, appear to be a definition rather than reference. */
573 if (bfd_is_und_section (sec) || bfd_is_com_section (sec))
578 if (h->root.type == bfd_link_hash_undefined
579 || h->root.type == bfd_link_hash_undefweak
580 || h->root.type == bfd_link_hash_common)
585 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
586 symbol, respectively, appears to be a common symbol in a dynamic
587 object. If a symbol appears in an uninitialized section, and is
588 not weak, and is not a function, then it may be a common symbol
589 which was resolved when the dynamic object was created. We want
590 to treat such symbols specially, because they raise special
591 considerations when setting the symbol size: if the symbol
592 appears as a common symbol in a regular object, and the size in
593 the regular object is larger, we must make sure that we use the
594 larger size. This problematic case can always be avoided in C,
595 but it must be handled correctly when using Fortran shared
598 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
599 likewise for OLDDYNCOMMON and OLDDEF.
601 Note that this test is just a heuristic, and that it is quite
602 possible to have an uninitialized symbol in a shared object which
603 is really a definition, rather than a common symbol. This could
604 lead to some minor confusion when the symbol really is a common
605 symbol in some regular object. However, I think it will be
610 && (sec->flags & SEC_ALLOC) != 0
611 && (sec->flags & SEC_LOAD) == 0
614 && ELF_ST_TYPE (sym->st_info) != STT_FUNC)
617 newdyncommon = false;
621 && h->root.type == bfd_link_hash_defined
622 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
623 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
624 && (h->root.u.def.section->flags & SEC_LOAD) == 0
626 && h->type != STT_FUNC)
629 olddyncommon = false;
631 /* It's OK to change the type if either the existing symbol or the
632 new symbol is weak unless it comes from a DT_NEEDED entry of
633 a shared object, in which case, the DT_NEEDED entry may not be
634 required at the run time. */
636 if ((! dt_needed && h->root.type == bfd_link_hash_defweak)
637 || h->root.type == bfd_link_hash_undefweak
639 *type_change_ok = true;
641 /* It's OK to change the size if either the existing symbol or the
642 new symbol is weak, or if the old symbol is undefined. */
645 || h->root.type == bfd_link_hash_undefined)
646 *size_change_ok = true;
648 /* If both the old and the new symbols look like common symbols in a
649 dynamic object, set the size of the symbol to the larger of the
654 && sym->st_size != h->size)
656 /* Since we think we have two common symbols, issue a multiple
657 common warning if desired. Note that we only warn if the
658 size is different. If the size is the same, we simply let
659 the old symbol override the new one as normally happens with
660 symbols defined in dynamic objects. */
662 if (! ((*info->callbacks->multiple_common)
663 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
664 h->size, abfd, bfd_link_hash_common, sym->st_size)))
667 if (sym->st_size > h->size)
668 h->size = sym->st_size;
670 *size_change_ok = true;
673 /* If we are looking at a dynamic object, and we have found a
674 definition, we need to see if the symbol was already defined by
675 some other object. If so, we want to use the existing
676 definition, and we do not want to report a multiple symbol
677 definition error; we do this by clobbering *PSEC to be
680 We treat a common symbol as a definition if the symbol in the
681 shared library is a function, since common symbols always
682 represent variables; this can cause confusion in principle, but
683 any such confusion would seem to indicate an erroneous program or
684 shared library. We also permit a common symbol in a regular
685 object to override a weak symbol in a shared object.
687 We prefer a non-weak definition in a shared library to a weak
688 definition in the executable unless it comes from a DT_NEEDED
689 entry of a shared object, in which case, the DT_NEEDED entry
690 may not be required at the run time. */
695 || (h->root.type == bfd_link_hash_common
697 || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))
698 && (h->root.type != bfd_link_hash_defweak
700 || bind == STB_WEAK))
704 newdyncommon = false;
706 *psec = sec = bfd_und_section_ptr;
707 *size_change_ok = true;
709 /* If we get here when the old symbol is a common symbol, then
710 we are explicitly letting it override a weak symbol or
711 function in a dynamic object, and we don't want to warn about
712 a type change. If the old symbol is a defined symbol, a type
713 change warning may still be appropriate. */
715 if (h->root.type == bfd_link_hash_common)
716 *type_change_ok = true;
719 /* Handle the special case of an old common symbol merging with a
720 new symbol which looks like a common symbol in a shared object.
721 We change *PSEC and *PVALUE to make the new symbol look like a
722 common symbol, and let _bfd_generic_link_add_one_symbol will do
726 && h->root.type == bfd_link_hash_common)
730 newdyncommon = false;
731 *pvalue = sym->st_size;
732 *psec = sec = bfd_com_section_ptr;
733 *size_change_ok = true;
736 /* If the old symbol is from a dynamic object, and the new symbol is
737 a definition which is not from a dynamic object, then the new
738 symbol overrides the old symbol. Symbols from regular files
739 always take precedence over symbols from dynamic objects, even if
740 they are defined after the dynamic object in the link.
742 As above, we again permit a common symbol in a regular object to
743 override a definition in a shared object if the shared object
744 symbol is a function or is weak.
746 As above, we permit a non-weak definition in a shared object to
747 override a weak definition in a regular object. */
751 || (bfd_is_com_section (sec)
752 && (h->root.type == bfd_link_hash_defweak
753 || h->type == STT_FUNC)))
756 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
758 || h->root.type == bfd_link_hash_defweak))
760 /* Change the hash table entry to undefined, and let
761 _bfd_generic_link_add_one_symbol do the right thing with the
764 h->root.type = bfd_link_hash_undefined;
765 h->root.u.undef.abfd = h->root.u.def.section->owner;
766 *size_change_ok = true;
769 olddyncommon = false;
771 /* We again permit a type change when a common symbol may be
772 overriding a function. */
774 if (bfd_is_com_section (sec))
775 *type_change_ok = true;
777 /* This union may have been set to be non-NULL when this symbol
778 was seen in a dynamic object. We must force the union to be
779 NULL, so that it is correct for a regular symbol. */
781 h->verinfo.vertree = NULL;
783 /* In this special case, if H is the target of an indirection,
784 we want the caller to frob with H rather than with the
785 indirect symbol. That will permit the caller to redefine the
786 target of the indirection, rather than the indirect symbol
787 itself. FIXME: This will break the -y option if we store a
788 symbol with a different name. */
792 /* Handle the special case of a new common symbol merging with an
793 old symbol that looks like it might be a common symbol defined in
794 a shared object. Note that we have already handled the case in
795 which a new common symbol should simply override the definition
796 in the shared library. */
799 && bfd_is_com_section (sec)
802 /* It would be best if we could set the hash table entry to a
803 common symbol, but we don't know what to use for the section
805 if (! ((*info->callbacks->multiple_common)
806 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
807 h->size, abfd, bfd_link_hash_common, sym->st_size)))
810 /* If the predumed common symbol in the dynamic object is
811 larger, pretend that the new symbol has its size. */
813 if (h->size > *pvalue)
816 /* FIXME: We no longer know the alignment required by the symbol
817 in the dynamic object, so we just wind up using the one from
818 the regular object. */
821 olddyncommon = false;
823 h->root.type = bfd_link_hash_undefined;
824 h->root.u.undef.abfd = h->root.u.def.section->owner;
826 *size_change_ok = true;
827 *type_change_ok = true;
829 h->verinfo.vertree = NULL;
832 /* Handle the special case of a weak definition in a regular object
833 followed by a non-weak definition in a shared object. In this
834 case, we prefer the definition in the shared object unless it
835 comes from a DT_NEEDED entry of a shared object, in which case,
836 the DT_NEEDED entry may not be required at the run time. */
839 && h->root.type == bfd_link_hash_defweak
844 /* To make this work we have to frob the flags so that the rest
845 of the code does not think we are using the regular
847 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
848 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
849 else if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)
850 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
851 h->elf_link_hash_flags &= ~ (ELF_LINK_HASH_DEF_REGULAR
852 | ELF_LINK_HASH_DEF_DYNAMIC);
854 /* If H is the target of an indirection, we want the caller to
855 use H rather than the indirect symbol. Otherwise if we are
856 defining a new indirect symbol we will wind up attaching it
857 to the entry we are overriding. */
861 /* Handle the special case of a non-weak definition in a shared
862 object followed by a weak definition in a regular object. In
863 this case we prefer to definition in the shared object. To make
864 this work we have to tell the caller to not treat the new symbol
868 && h->root.type != bfd_link_hash_defweak
877 /* Add symbols from an ELF object file to the linker hash table. */
880 elf_link_add_object_symbols (abfd, info)
882 struct bfd_link_info *info;
884 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
885 const Elf_Internal_Sym *,
886 const char **, flagword *,
887 asection **, bfd_vma *));
888 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
889 asection *, const Elf_Internal_Rela *));
891 Elf_Internal_Shdr *hdr;
895 Elf_External_Sym *buf = NULL;
896 struct elf_link_hash_entry **sym_hash;
898 Elf_External_Versym *extversym = NULL;
899 Elf_External_Versym *ever;
900 Elf_External_Dyn *dynbuf = NULL;
901 struct elf_link_hash_entry *weaks;
902 Elf_External_Sym *esym;
903 Elf_External_Sym *esymend;
904 struct elf_backend_data *bed;
907 bed = get_elf_backend_data (abfd);
908 add_symbol_hook = bed->elf_add_symbol_hook;
909 collect = bed->collect;
911 if ((abfd->flags & DYNAMIC) == 0)
917 /* You can't use -r against a dynamic object. Also, there's no
918 hope of using a dynamic object which does not exactly match
919 the format of the output file. */
920 if (info->relocateable || info->hash->creator != abfd->xvec)
922 bfd_set_error (bfd_error_invalid_operation);
927 /* As a GNU extension, any input sections which are named
928 .gnu.warning.SYMBOL are treated as warning symbols for the given
929 symbol. This differs from .gnu.warning sections, which generate
930 warnings when they are included in an output file. */
935 for (s = abfd->sections; s != NULL; s = s->next)
939 name = bfd_get_section_name (abfd, s);
940 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
945 name += sizeof ".gnu.warning." - 1;
947 /* If this is a shared object, then look up the symbol
948 in the hash table. If it is there, and it is already
949 been defined, then we will not be using the entry
950 from this shared object, so we don't need to warn.
951 FIXME: If we see the definition in a regular object
952 later on, we will warn, but we shouldn't. The only
953 fix is to keep track of what warnings we are supposed
954 to emit, and then handle them all at the end of the
956 if (dynamic && abfd->xvec == info->hash->creator)
958 struct elf_link_hash_entry *h;
960 h = elf_link_hash_lookup (elf_hash_table (info), name,
963 /* FIXME: What about bfd_link_hash_common? */
965 && (h->root.type == bfd_link_hash_defined
966 || h->root.type == bfd_link_hash_defweak))
968 /* We don't want to issue this warning. Clobber
969 the section size so that the warning does not
970 get copied into the output file. */
976 sz = bfd_section_size (abfd, s);
977 msg = (char *) bfd_alloc (abfd, sz + 1);
981 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
986 if (! (_bfd_generic_link_add_one_symbol
987 (info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg,
988 false, collect, (struct bfd_link_hash_entry **) NULL)))
991 if (! info->relocateable)
993 /* Clobber the section size so that the warning does
994 not get copied into the output file. */
1001 /* If this is a dynamic object, we always link against the .dynsym
1002 symbol table, not the .symtab symbol table. The dynamic linker
1003 will only see the .dynsym symbol table, so there is no reason to
1004 look at .symtab for a dynamic object. */
1006 if (! dynamic || elf_dynsymtab (abfd) == 0)
1007 hdr = &elf_tdata (abfd)->symtab_hdr;
1009 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
1013 /* Read in any version definitions. */
1015 if (! _bfd_elf_slurp_version_tables (abfd))
1018 /* Read in the symbol versions, but don't bother to convert them
1019 to internal format. */
1020 if (elf_dynversym (abfd) != 0)
1022 Elf_Internal_Shdr *versymhdr;
1024 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
1025 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
1026 if (extversym == NULL)
1028 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
1029 || (bfd_read ((PTR) extversym, 1, versymhdr->sh_size, abfd)
1030 != versymhdr->sh_size))
1035 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1037 /* The sh_info field of the symtab header tells us where the
1038 external symbols start. We don't care about the local symbols at
1040 if (elf_bad_symtab (abfd))
1042 extsymcount = symcount;
1047 extsymcount = symcount - hdr->sh_info;
1048 extsymoff = hdr->sh_info;
1051 buf = ((Elf_External_Sym *)
1052 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
1053 if (buf == NULL && extsymcount != 0)
1056 /* We store a pointer to the hash table entry for each external
1058 sym_hash = ((struct elf_link_hash_entry **)
1060 extsymcount * sizeof (struct elf_link_hash_entry *)));
1061 if (sym_hash == NULL)
1063 elf_sym_hashes (abfd) = sym_hash;
1069 /* If we are creating a shared library, create all the dynamic
1070 sections immediately. We need to attach them to something,
1071 so we attach them to this BFD, provided it is the right
1072 format. FIXME: If there are no input BFD's of the same
1073 format as the output, we can't make a shared library. */
1075 && ! elf_hash_table (info)->dynamic_sections_created
1076 && abfd->xvec == info->hash->creator)
1078 if (! elf_link_create_dynamic_sections (abfd, info))
1087 bfd_size_type oldsize;
1088 bfd_size_type strindex;
1090 /* Find the name to use in a DT_NEEDED entry that refers to this
1091 object. If the object has a DT_SONAME entry, we use it.
1092 Otherwise, if the generic linker stuck something in
1093 elf_dt_name, we use that. Otherwise, we just use the file
1094 name. If the generic linker put a null string into
1095 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1096 there is a DT_SONAME entry. */
1098 name = bfd_get_filename (abfd);
1099 if (elf_dt_name (abfd) != NULL)
1101 name = elf_dt_name (abfd);
1104 if (elf_dt_soname (abfd) != NULL)
1110 s = bfd_get_section_by_name (abfd, ".dynamic");
1113 Elf_External_Dyn *extdyn;
1114 Elf_External_Dyn *extdynend;
1120 dynbuf = (Elf_External_Dyn *) bfd_malloc ((size_t) s->_raw_size);
1124 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
1125 (file_ptr) 0, s->_raw_size))
1128 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1131 link = elf_elfsections (abfd)[elfsec]->sh_link;
1134 /* The shared libraries distributed with hpux11 have a bogus
1135 sh_link field for the ".dynamic" section. This code detects
1136 when LINK refers to a section that is not a string table and
1137 tries to find the string table for the ".dynsym" section
1139 Elf_Internal_Shdr *hdr = elf_elfsections (abfd)[link];
1140 if (hdr->sh_type != SHT_STRTAB)
1142 asection *s = bfd_get_section_by_name (abfd, ".dynsym");
1143 int elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1146 link = elf_elfsections (abfd)[elfsec]->sh_link;
1151 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
1154 for (; extdyn < extdynend; extdyn++)
1156 Elf_Internal_Dyn dyn;
1158 elf_swap_dyn_in (abfd, extdyn, &dyn);
1159 if (dyn.d_tag == DT_SONAME)
1161 name = bfd_elf_string_from_elf_section (abfd, link,
1166 if (dyn.d_tag == DT_NEEDED)
1168 struct bfd_link_needed_list *n, **pn;
1171 n = ((struct bfd_link_needed_list *)
1172 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1173 fnm = bfd_elf_string_from_elf_section (abfd, link,
1175 if (n == NULL || fnm == NULL)
1177 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1184 for (pn = &elf_hash_table (info)->needed;
1190 if (dyn.d_tag == DT_RUNPATH)
1192 struct bfd_link_needed_list *n, **pn;
1195 /* When we see DT_RPATH before DT_RUNPATH, we have
1196 to clear runpath. Do _NOT_ bfd_release, as that
1197 frees all more recently bfd_alloc'd blocks as
1199 if (rpath && elf_hash_table (info)->runpath)
1200 elf_hash_table (info)->runpath = NULL;
1202 n = ((struct bfd_link_needed_list *)
1203 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1204 fnm = bfd_elf_string_from_elf_section (abfd, link,
1206 if (n == NULL || fnm == NULL)
1208 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1215 for (pn = &elf_hash_table (info)->runpath;
1223 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1224 if (!runpath && dyn.d_tag == DT_RPATH)
1226 struct bfd_link_needed_list *n, **pn;
1229 n = ((struct bfd_link_needed_list *)
1230 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
1231 fnm = bfd_elf_string_from_elf_section (abfd, link,
1233 if (n == NULL || fnm == NULL)
1235 anm = bfd_alloc (abfd, strlen (fnm) + 1);
1242 for (pn = &elf_hash_table (info)->runpath;
1255 /* We do not want to include any of the sections in a dynamic
1256 object in the output file. We hack by simply clobbering the
1257 list of sections in the BFD. This could be handled more
1258 cleanly by, say, a new section flag; the existing
1259 SEC_NEVER_LOAD flag is not the one we want, because that one
1260 still implies that the section takes up space in the output
1262 abfd->sections = NULL;
1263 abfd->section_count = 0;
1265 /* If this is the first dynamic object found in the link, create
1266 the special sections required for dynamic linking. */
1267 if (! elf_hash_table (info)->dynamic_sections_created)
1269 if (! elf_link_create_dynamic_sections (abfd, info))
1275 /* Add a DT_NEEDED entry for this dynamic object. */
1276 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1277 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr, name,
1279 if (strindex == (bfd_size_type) -1)
1282 if (oldsize == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
1285 Elf_External_Dyn *dyncon, *dynconend;
1287 /* The hash table size did not change, which means that
1288 the dynamic object name was already entered. If we
1289 have already included this dynamic object in the
1290 link, just ignore it. There is no reason to include
1291 a particular dynamic object more than once. */
1292 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
1294 BFD_ASSERT (sdyn != NULL);
1296 dyncon = (Elf_External_Dyn *) sdyn->contents;
1297 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1299 for (; dyncon < dynconend; dyncon++)
1301 Elf_Internal_Dyn dyn;
1303 elf_swap_dyn_in (elf_hash_table (info)->dynobj, dyncon,
1305 if (dyn.d_tag == DT_NEEDED
1306 && dyn.d_un.d_val == strindex)
1310 if (extversym != NULL)
1317 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
1321 /* Save the SONAME, if there is one, because sometimes the
1322 linker emulation code will need to know it. */
1324 name = basename (bfd_get_filename (abfd));
1325 elf_dt_name (abfd) = name;
1329 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
1331 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
1332 != extsymcount * sizeof (Elf_External_Sym)))
1337 ever = extversym != NULL ? extversym + extsymoff : NULL;
1338 esymend = buf + extsymcount;
1341 esym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
1343 Elf_Internal_Sym sym;
1349 struct elf_link_hash_entry *h;
1351 boolean size_change_ok, type_change_ok;
1352 boolean new_weakdef;
1353 unsigned int old_alignment;
1355 elf_swap_symbol_in (abfd, esym, &sym);
1357 flags = BSF_NO_FLAGS;
1359 value = sym.st_value;
1362 bind = ELF_ST_BIND (sym.st_info);
1363 if (bind == STB_LOCAL)
1365 /* This should be impossible, since ELF requires that all
1366 global symbols follow all local symbols, and that sh_info
1367 point to the first global symbol. Unfortunatealy, Irix 5
1371 else if (bind == STB_GLOBAL)
1373 if (sym.st_shndx != SHN_UNDEF
1374 && sym.st_shndx != SHN_COMMON)
1377 else if (bind == STB_WEAK)
1381 /* Leave it up to the processor backend. */
1384 if (sym.st_shndx == SHN_UNDEF)
1385 sec = bfd_und_section_ptr;
1386 else if (sym.st_shndx > 0 && sym.st_shndx < SHN_LORESERVE)
1388 sec = section_from_elf_index (abfd, sym.st_shndx);
1390 sec = bfd_abs_section_ptr;
1391 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
1394 else if (sym.st_shndx == SHN_ABS)
1395 sec = bfd_abs_section_ptr;
1396 else if (sym.st_shndx == SHN_COMMON)
1398 sec = bfd_com_section_ptr;
1399 /* What ELF calls the size we call the value. What ELF
1400 calls the value we call the alignment. */
1401 value = sym.st_size;
1405 /* Leave it up to the processor backend. */
1408 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
1409 if (name == (const char *) NULL)
1412 if (add_symbol_hook)
1414 if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
1418 /* The hook function sets the name to NULL if this symbol
1419 should be skipped for some reason. */
1420 if (name == (const char *) NULL)
1424 /* Sanity check that all possibilities were handled. */
1425 if (sec == (asection *) NULL)
1427 bfd_set_error (bfd_error_bad_value);
1431 if (bfd_is_und_section (sec)
1432 || bfd_is_com_section (sec))
1437 size_change_ok = false;
1438 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
1440 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1442 Elf_Internal_Versym iver;
1443 unsigned int vernum = 0;
1448 _bfd_elf_swap_versym_in (abfd, ever, &iver);
1449 vernum = iver.vs_vers & VERSYM_VERSION;
1451 /* If this is a hidden symbol, or if it is not version
1452 1, we append the version name to the symbol name.
1453 However, we do not modify a non-hidden absolute
1454 symbol, because it might be the version symbol
1455 itself. FIXME: What if it isn't? */
1456 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
1457 || (vernum > 1 && ! bfd_is_abs_section (sec)))
1460 int namelen, newlen;
1463 if (sym.st_shndx != SHN_UNDEF)
1465 if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
1467 (*_bfd_error_handler)
1468 (_("%s: %s: invalid version %u (max %d)"),
1469 bfd_get_filename (abfd), name, vernum,
1470 elf_tdata (abfd)->dynverdef_hdr.sh_info);
1471 bfd_set_error (bfd_error_bad_value);
1474 else if (vernum > 1)
1476 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
1482 /* We cannot simply test for the number of
1483 entries in the VERNEED section since the
1484 numbers for the needed versions do not start
1486 Elf_Internal_Verneed *t;
1489 for (t = elf_tdata (abfd)->verref;
1493 Elf_Internal_Vernaux *a;
1495 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1497 if (a->vna_other == vernum)
1499 verstr = a->vna_nodename;
1508 (*_bfd_error_handler)
1509 (_("%s: %s: invalid needed version %d"),
1510 bfd_get_filename (abfd), name, vernum);
1511 bfd_set_error (bfd_error_bad_value);
1516 namelen = strlen (name);
1517 newlen = namelen + strlen (verstr) + 2;
1518 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
1521 newname = (char *) bfd_alloc (abfd, newlen);
1522 if (newname == NULL)
1524 strcpy (newname, name);
1525 p = newname + namelen;
1527 /* If this is a defined non-hidden version symbol,
1528 we add another @ to the name. This indicates the
1529 default version of the symbol. */
1530 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
1531 && sym.st_shndx != SHN_UNDEF)
1539 if (! elf_merge_symbol (abfd, info, name, &sym, &sec, &value,
1540 sym_hash, &override, &type_change_ok,
1541 &size_change_ok, dt_needed))
1548 while (h->root.type == bfd_link_hash_indirect
1549 || h->root.type == bfd_link_hash_warning)
1550 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1552 /* Remember the old alignment if this is a common symbol, so
1553 that we don't reduce the alignment later on. We can't
1554 check later, because _bfd_generic_link_add_one_symbol
1555 will set a default for the alignment which we want to
1557 if (h->root.type == bfd_link_hash_common)
1558 old_alignment = h->root.u.c.p->alignment_power;
1560 if (elf_tdata (abfd)->verdef != NULL
1564 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
1567 if (! (_bfd_generic_link_add_one_symbol
1568 (info, abfd, name, flags, sec, value, (const char *) NULL,
1569 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
1573 while (h->root.type == bfd_link_hash_indirect
1574 || h->root.type == bfd_link_hash_warning)
1575 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1578 new_weakdef = false;
1581 && (flags & BSF_WEAK) != 0
1582 && ELF_ST_TYPE (sym.st_info) != STT_FUNC
1583 && info->hash->creator->flavour == bfd_target_elf_flavour
1584 && h->weakdef == NULL)
1586 /* Keep a list of all weak defined non function symbols from
1587 a dynamic object, using the weakdef field. Later in this
1588 function we will set the weakdef field to the correct
1589 value. We only put non-function symbols from dynamic
1590 objects on this list, because that happens to be the only
1591 time we need to know the normal symbol corresponding to a
1592 weak symbol, and the information is time consuming to
1593 figure out. If the weakdef field is not already NULL,
1594 then this symbol was already defined by some previous
1595 dynamic object, and we will be using that previous
1596 definition anyhow. */
1603 /* Set the alignment of a common symbol. */
1604 if (sym.st_shndx == SHN_COMMON
1605 && h->root.type == bfd_link_hash_common)
1609 align = bfd_log2 (sym.st_value);
1610 if (align > old_alignment
1611 /* Permit an alignment power of zero if an alignment of one
1612 is specified and no other alignments have been specified. */
1613 || (sym.st_value == 1 && old_alignment == 0))
1614 h->root.u.c.p->alignment_power = align;
1617 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1623 /* Remember the symbol size and type. */
1624 if (sym.st_size != 0
1625 && (definition || h->size == 0))
1627 if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
1628 (*_bfd_error_handler)
1629 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1630 name, (unsigned long) h->size, (unsigned long) sym.st_size,
1631 bfd_get_filename (abfd));
1633 h->size = sym.st_size;
1636 /* If this is a common symbol, then we always want H->SIZE
1637 to be the size of the common symbol. The code just above
1638 won't fix the size if a common symbol becomes larger. We
1639 don't warn about a size change here, because that is
1640 covered by --warn-common. */
1641 if (h->root.type == bfd_link_hash_common)
1642 h->size = h->root.u.c.size;
1644 if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
1645 && (definition || h->type == STT_NOTYPE))
1647 if (h->type != STT_NOTYPE
1648 && h->type != ELF_ST_TYPE (sym.st_info)
1649 && ! type_change_ok)
1650 (*_bfd_error_handler)
1651 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1652 name, h->type, ELF_ST_TYPE (sym.st_info),
1653 bfd_get_filename (abfd));
1655 h->type = ELF_ST_TYPE (sym.st_info);
1658 /* If st_other has a processor-specific meaning, specific code
1659 might be needed here. */
1660 if (sym.st_other != 0)
1662 /* Combine visibilities, using the most constraining one. */
1663 unsigned char hvis = ELF_ST_VISIBILITY (h->other);
1664 unsigned char symvis = ELF_ST_VISIBILITY (sym.st_other);
1666 if (symvis && (hvis > symvis || hvis == 0))
1667 h->other = sym.st_other;
1669 /* If neither has visibility, use the st_other of the
1670 definition. This is an arbitrary choice, since the
1671 other bits have no general meaning. */
1672 if (!symvis && !hvis
1673 && (definition || h->other == 0))
1674 h->other = sym.st_other;
1677 /* Set a flag in the hash table entry indicating the type of
1678 reference or definition we just found. Keep a count of
1679 the number of dynamic symbols we find. A dynamic symbol
1680 is one which is referenced or defined by both a regular
1681 object and a shared object. */
1682 old_flags = h->elf_link_hash_flags;
1688 new_flag = ELF_LINK_HASH_REF_REGULAR;
1689 if (bind != STB_WEAK)
1690 new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK;
1693 new_flag = ELF_LINK_HASH_DEF_REGULAR;
1695 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
1696 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
1702 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
1704 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
1705 if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
1706 | ELF_LINK_HASH_REF_REGULAR)) != 0
1707 || (h->weakdef != NULL
1709 && h->weakdef->dynindx != -1))
1713 h->elf_link_hash_flags |= new_flag;
1715 /* If this symbol has a version, and it is the default
1716 version, we create an indirect symbol from the default
1717 name to the fully decorated name. This will cause
1718 external references which do not specify a version to be
1719 bound to this version of the symbol. */
1720 if (definition || h->root.type == bfd_link_hash_common)
1724 p = strchr (name, ELF_VER_CHR);
1725 if (p != NULL && p[1] == ELF_VER_CHR)
1728 struct elf_link_hash_entry *hi;
1731 shortname = bfd_hash_allocate (&info->hash->table,
1733 if (shortname == NULL)
1735 strncpy (shortname, name, p - name);
1736 shortname[p - name] = '\0';
1738 /* We are going to create a new symbol. Merge it
1739 with any existing symbol with this name. For the
1740 purposes of the merge, act as though we were
1741 defining the symbol we just defined, although we
1742 actually going to define an indirect symbol. */
1743 type_change_ok = false;
1744 size_change_ok = false;
1745 if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
1746 &value, &hi, &override,
1748 &size_change_ok, dt_needed))
1753 if (! (_bfd_generic_link_add_one_symbol
1754 (info, abfd, shortname, BSF_INDIRECT,
1755 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1756 collect, (struct bfd_link_hash_entry **) &hi)))
1761 /* In this case the symbol named SHORTNAME is
1762 overriding the indirect symbol we want to
1763 add. We were planning on making SHORTNAME an
1764 indirect symbol referring to NAME. SHORTNAME
1765 is the name without a version. NAME is the
1766 fully versioned name, and it is the default
1769 Overriding means that we already saw a
1770 definition for the symbol SHORTNAME in a
1771 regular object, and it is overriding the
1772 symbol defined in the dynamic object.
1774 When this happens, we actually want to change
1775 NAME, the symbol we just added, to refer to
1776 SHORTNAME. This will cause references to
1777 NAME in the shared object to become
1778 references to SHORTNAME in the regular
1779 object. This is what we expect when we
1780 override a function in a shared object: that
1781 the references in the shared object will be
1782 mapped to the definition in the regular
1785 while (hi->root.type == bfd_link_hash_indirect
1786 || hi->root.type == bfd_link_hash_warning)
1787 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1789 h->root.type = bfd_link_hash_indirect;
1790 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1791 if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC)
1793 h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC;
1794 hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
1795 if (hi->elf_link_hash_flags
1796 & (ELF_LINK_HASH_REF_REGULAR
1797 | ELF_LINK_HASH_DEF_REGULAR))
1799 if (! _bfd_elf_link_record_dynamic_symbol (info,
1805 /* Now set HI to H, so that the following code
1806 will set the other fields correctly. */
1810 /* If there is a duplicate definition somewhere,
1811 then HI may not point to an indirect symbol. We
1812 will have reported an error to the user in that
1815 if (hi->root.type == bfd_link_hash_indirect)
1817 struct elf_link_hash_entry *ht;
1819 /* If the symbol became indirect, then we assume
1820 that we have not seen a definition before. */
1821 BFD_ASSERT ((hi->elf_link_hash_flags
1822 & (ELF_LINK_HASH_DEF_DYNAMIC
1823 | ELF_LINK_HASH_DEF_REGULAR))
1826 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1827 (*bed->elf_backend_copy_indirect_symbol) (ht, hi);
1829 /* See if the new flags lead us to realize that
1830 the symbol must be dynamic. */
1836 || ((hi->elf_link_hash_flags
1837 & ELF_LINK_HASH_REF_DYNAMIC)
1843 if ((hi->elf_link_hash_flags
1844 & ELF_LINK_HASH_REF_REGULAR) != 0)
1850 /* We also need to define an indirection from the
1851 nondefault version of the symbol. */
1853 shortname = bfd_hash_allocate (&info->hash->table,
1855 if (shortname == NULL)
1857 strncpy (shortname, name, p - name);
1858 strcpy (shortname + (p - name), p + 1);
1860 /* Once again, merge with any existing symbol. */
1861 type_change_ok = false;
1862 size_change_ok = false;
1863 if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec,
1864 &value, &hi, &override,
1866 &size_change_ok, dt_needed))
1871 /* Here SHORTNAME is a versioned name, so we
1872 don't expect to see the type of override we
1873 do in the case above. */
1874 (*_bfd_error_handler)
1875 (_("%s: warning: unexpected redefinition of `%s'"),
1876 bfd_get_filename (abfd), shortname);
1880 if (! (_bfd_generic_link_add_one_symbol
1881 (info, abfd, shortname, BSF_INDIRECT,
1882 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1883 collect, (struct bfd_link_hash_entry **) &hi)))
1886 /* If there is a duplicate definition somewhere,
1887 then HI may not point to an indirect symbol.
1888 We will have reported an error to the user in
1891 if (hi->root.type == bfd_link_hash_indirect)
1893 /* If the symbol became indirect, then we
1894 assume that we have not seen a definition
1896 BFD_ASSERT ((hi->elf_link_hash_flags
1897 & (ELF_LINK_HASH_DEF_DYNAMIC
1898 | ELF_LINK_HASH_DEF_REGULAR))
1901 (*bed->elf_backend_copy_indirect_symbol) (h, hi);
1903 /* See if the new flags lead us to realize
1904 that the symbol must be dynamic. */
1910 || ((hi->elf_link_hash_flags
1911 & ELF_LINK_HASH_REF_DYNAMIC)
1917 if ((hi->elf_link_hash_flags
1918 & ELF_LINK_HASH_REF_REGULAR) != 0)
1927 if (dynsym && h->dynindx == -1)
1929 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
1931 if (h->weakdef != NULL
1933 && h->weakdef->dynindx == -1)
1935 if (! _bfd_elf_link_record_dynamic_symbol (info,
1940 else if (dynsym && h->dynindx != -1)
1941 /* If the symbol already has a dynamic index, but
1942 visibility says it should not be visible, turn it into
1944 switch (ELF_ST_VISIBILITY (h->other))
1948 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
1949 (*bed->elf_backend_hide_symbol) (info, h);
1953 if (dt_needed && definition
1954 && (h->elf_link_hash_flags
1955 & ELF_LINK_HASH_REF_REGULAR) != 0)
1957 bfd_size_type oldsize;
1958 bfd_size_type strindex;
1960 /* The symbol from a DT_NEEDED object is referenced from
1961 the regular object to create a dynamic executable. We
1962 have to make sure there is a DT_NEEDED entry for it. */
1965 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1966 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
1967 elf_dt_soname (abfd),
1969 if (strindex == (bfd_size_type) -1)
1973 == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
1976 Elf_External_Dyn *dyncon, *dynconend;
1978 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
1980 BFD_ASSERT (sdyn != NULL);
1982 dyncon = (Elf_External_Dyn *) sdyn->contents;
1983 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1985 for (; dyncon < dynconend; dyncon++)
1987 Elf_Internal_Dyn dyn;
1989 elf_swap_dyn_in (elf_hash_table (info)->dynobj,
1991 BFD_ASSERT (dyn.d_tag != DT_NEEDED ||
1992 dyn.d_un.d_val != strindex);
1996 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
2002 /* Now set the weakdefs field correctly for all the weak defined
2003 symbols we found. The only way to do this is to search all the
2004 symbols. Since we only need the information for non functions in
2005 dynamic objects, that's the only time we actually put anything on
2006 the list WEAKS. We need this information so that if a regular
2007 object refers to a symbol defined weakly in a dynamic object, the
2008 real symbol in the dynamic object is also put in the dynamic
2009 symbols; we also must arrange for both symbols to point to the
2010 same memory location. We could handle the general case of symbol
2011 aliasing, but a general symbol alias can only be generated in
2012 assembler code, handling it correctly would be very time
2013 consuming, and other ELF linkers don't handle general aliasing
2015 while (weaks != NULL)
2017 struct elf_link_hash_entry *hlook;
2020 struct elf_link_hash_entry **hpp;
2021 struct elf_link_hash_entry **hppend;
2024 weaks = hlook->weakdef;
2025 hlook->weakdef = NULL;
2027 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
2028 || hlook->root.type == bfd_link_hash_defweak
2029 || hlook->root.type == bfd_link_hash_common
2030 || hlook->root.type == bfd_link_hash_indirect);
2031 slook = hlook->root.u.def.section;
2032 vlook = hlook->root.u.def.value;
2034 hpp = elf_sym_hashes (abfd);
2035 hppend = hpp + extsymcount;
2036 for (; hpp < hppend; hpp++)
2038 struct elf_link_hash_entry *h;
2041 if (h != NULL && h != hlook
2042 && h->root.type == bfd_link_hash_defined
2043 && h->root.u.def.section == slook
2044 && h->root.u.def.value == vlook)
2048 /* If the weak definition is in the list of dynamic
2049 symbols, make sure the real definition is put there
2051 if (hlook->dynindx != -1
2052 && h->dynindx == -1)
2054 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2058 /* If the real definition is in the list of dynamic
2059 symbols, make sure the weak definition is put there
2060 as well. If we don't do this, then the dynamic
2061 loader might not merge the entries for the real
2062 definition and the weak definition. */
2063 if (h->dynindx != -1
2064 && hlook->dynindx == -1)
2066 if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
2081 if (extversym != NULL)
2087 /* If this object is the same format as the output object, and it is
2088 not a shared library, then let the backend look through the
2091 This is required to build global offset table entries and to
2092 arrange for dynamic relocs. It is not required for the
2093 particular common case of linking non PIC code, even when linking
2094 against shared libraries, but unfortunately there is no way of
2095 knowing whether an object file has been compiled PIC or not.
2096 Looking through the relocs is not particularly time consuming.
2097 The problem is that we must either (1) keep the relocs in memory,
2098 which causes the linker to require additional runtime memory or
2099 (2) read the relocs twice from the input file, which wastes time.
2100 This would be a good case for using mmap.
2102 I have no idea how to handle linking PIC code into a file of a
2103 different format. It probably can't be done. */
2104 check_relocs = get_elf_backend_data (abfd)->check_relocs;
2106 && abfd->xvec == info->hash->creator
2107 && check_relocs != NULL)
2111 for (o = abfd->sections; o != NULL; o = o->next)
2113 Elf_Internal_Rela *internal_relocs;
2116 if ((o->flags & SEC_RELOC) == 0
2117 || o->reloc_count == 0
2118 || ((info->strip == strip_all || info->strip == strip_debugger)
2119 && (o->flags & SEC_DEBUGGING) != 0)
2120 || bfd_is_abs_section (o->output_section))
2123 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2124 (abfd, o, (PTR) NULL,
2125 (Elf_Internal_Rela *) NULL,
2126 info->keep_memory));
2127 if (internal_relocs == NULL)
2130 ok = (*check_relocs) (abfd, info, o, internal_relocs);
2132 if (! info->keep_memory)
2133 free (internal_relocs);
2140 /* If this is a non-traditional, non-relocateable link, try to
2141 optimize the handling of the .stab/.stabstr sections. */
2143 && ! info->relocateable
2144 && ! info->traditional_format
2145 && info->hash->creator->flavour == bfd_target_elf_flavour
2146 && (info->strip != strip_all && info->strip != strip_debugger))
2148 asection *stab, *stabstr;
2150 stab = bfd_get_section_by_name (abfd, ".stab");
2153 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
2155 if (stabstr != NULL)
2157 struct bfd_elf_section_data *secdata;
2159 secdata = elf_section_data (stab);
2160 if (! _bfd_link_section_stabs (abfd,
2161 &elf_hash_table (info)->stab_info,
2163 &secdata->stab_info))
2169 if (! info->relocateable && ! dynamic)
2173 for (s = abfd->sections; s != NULL; s = s->next)
2174 if ((s->flags & SEC_MERGE)
2175 && ! _bfd_merge_section (abfd,
2176 &elf_hash_table (info)->merge_info,
2177 s, &elf_section_data (s)->merge_info))
2188 if (extversym != NULL)
2193 /* Create some sections which will be filled in with dynamic linking
2194 information. ABFD is an input file which requires dynamic sections
2195 to be created. The dynamic sections take up virtual memory space
2196 when the final executable is run, so we need to create them before
2197 addresses are assigned to the output sections. We work out the
2198 actual contents and size of these sections later. */
2201 elf_link_create_dynamic_sections (abfd, info)
2203 struct bfd_link_info *info;
2206 register asection *s;
2207 struct elf_link_hash_entry *h;
2208 struct elf_backend_data *bed;
2210 if (elf_hash_table (info)->dynamic_sections_created)
2213 /* Make sure that all dynamic sections use the same input BFD. */
2214 if (elf_hash_table (info)->dynobj == NULL)
2215 elf_hash_table (info)->dynobj = abfd;
2217 abfd = elf_hash_table (info)->dynobj;
2219 /* Note that we set the SEC_IN_MEMORY flag for all of these
2221 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
2222 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2224 /* A dynamically linked executable has a .interp section, but a
2225 shared library does not. */
2228 s = bfd_make_section (abfd, ".interp");
2230 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2234 /* Create sections to hold version informations. These are removed
2235 if they are not needed. */
2236 s = bfd_make_section (abfd, ".gnu.version_d");
2238 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2239 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2242 s = bfd_make_section (abfd, ".gnu.version");
2244 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2245 || ! bfd_set_section_alignment (abfd, s, 1))
2248 s = bfd_make_section (abfd, ".gnu.version_r");
2250 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2251 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2254 s = bfd_make_section (abfd, ".dynsym");
2256 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2257 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2260 s = bfd_make_section (abfd, ".dynstr");
2262 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2265 /* Create a strtab to hold the dynamic symbol names. */
2266 if (elf_hash_table (info)->dynstr == NULL)
2268 elf_hash_table (info)->dynstr = elf_stringtab_init ();
2269 if (elf_hash_table (info)->dynstr == NULL)
2273 s = bfd_make_section (abfd, ".dynamic");
2275 || ! bfd_set_section_flags (abfd, s, flags)
2276 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2279 /* The special symbol _DYNAMIC is always set to the start of the
2280 .dynamic section. This call occurs before we have processed the
2281 symbols for any dynamic object, so we don't have to worry about
2282 overriding a dynamic definition. We could set _DYNAMIC in a
2283 linker script, but we only want to define it if we are, in fact,
2284 creating a .dynamic section. We don't want to define it if there
2285 is no .dynamic section, since on some ELF platforms the start up
2286 code examines it to decide how to initialize the process. */
2288 if (! (_bfd_generic_link_add_one_symbol
2289 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
2290 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
2291 (struct bfd_link_hash_entry **) &h)))
2293 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2294 h->type = STT_OBJECT;
2297 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
2300 bed = get_elf_backend_data (abfd);
2302 s = bfd_make_section (abfd, ".hash");
2304 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2305 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2307 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
2309 /* Let the backend create the rest of the sections. This lets the
2310 backend set the right flags. The backend will normally create
2311 the .got and .plt sections. */
2312 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
2315 elf_hash_table (info)->dynamic_sections_created = true;
2320 /* Add an entry to the .dynamic table. */
2323 elf_add_dynamic_entry (info, tag, val)
2324 struct bfd_link_info *info;
2328 Elf_Internal_Dyn dyn;
2332 bfd_byte *newcontents;
2334 dynobj = elf_hash_table (info)->dynobj;
2336 s = bfd_get_section_by_name (dynobj, ".dynamic");
2337 BFD_ASSERT (s != NULL);
2339 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
2340 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
2341 if (newcontents == NULL)
2345 dyn.d_un.d_val = val;
2346 elf_swap_dyn_out (dynobj, &dyn,
2347 (Elf_External_Dyn *) (newcontents + s->_raw_size));
2349 s->_raw_size = newsize;
2350 s->contents = newcontents;
2355 /* Record a new local dynamic symbol. */
2358 elf_link_record_local_dynamic_symbol (info, input_bfd, input_indx)
2359 struct bfd_link_info *info;
2363 struct elf_link_local_dynamic_entry *entry;
2364 struct elf_link_hash_table *eht;
2365 struct bfd_strtab_hash *dynstr;
2366 Elf_External_Sym esym;
2367 unsigned long dynstr_index;
2370 /* See if the entry exists already. */
2371 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
2372 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
2375 entry = (struct elf_link_local_dynamic_entry *)
2376 bfd_alloc (input_bfd, sizeof (*entry));
2380 /* Go find the symbol, so that we can find it's name. */
2381 if (bfd_seek (input_bfd,
2382 (elf_tdata (input_bfd)->symtab_hdr.sh_offset
2383 + input_indx * sizeof (Elf_External_Sym)),
2385 || (bfd_read (&esym, sizeof (Elf_External_Sym), 1, input_bfd)
2386 != sizeof (Elf_External_Sym)))
2388 elf_swap_symbol_in (input_bfd, &esym, &entry->isym);
2390 name = (bfd_elf_string_from_elf_section
2391 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
2392 entry->isym.st_name));
2394 dynstr = elf_hash_table (info)->dynstr;
2397 /* Create a strtab to hold the dynamic symbol names. */
2398 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_stringtab_init ();
2403 dynstr_index = _bfd_stringtab_add (dynstr, name, true, false);
2404 if (dynstr_index == (unsigned long) -1)
2406 entry->isym.st_name = dynstr_index;
2408 eht = elf_hash_table (info);
2410 entry->next = eht->dynlocal;
2411 eht->dynlocal = entry;
2412 entry->input_bfd = input_bfd;
2413 entry->input_indx = input_indx;
2416 /* Whatever binding the symbol had before, it's now local. */
2418 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
2420 /* The dynindx will be set at the end of size_dynamic_sections. */
2425 /* Read and swap the relocs from the section indicated by SHDR. This
2426 may be either a REL or a RELA section. The relocations are
2427 translated into RELA relocations and stored in INTERNAL_RELOCS,
2428 which should have already been allocated to contain enough space.
2429 The EXTERNAL_RELOCS are a buffer where the external form of the
2430 relocations should be stored.
2432 Returns false if something goes wrong. */
2435 elf_link_read_relocs_from_section (abfd, shdr, external_relocs,
2438 Elf_Internal_Shdr *shdr;
2439 PTR external_relocs;
2440 Elf_Internal_Rela *internal_relocs;
2442 struct elf_backend_data *bed;
2444 /* If there aren't any relocations, that's OK. */
2448 /* Position ourselves at the start of the section. */
2449 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2452 /* Read the relocations. */
2453 if (bfd_read (external_relocs, 1, shdr->sh_size, abfd)
2457 bed = get_elf_backend_data (abfd);
2459 /* Convert the external relocations to the internal format. */
2460 if (shdr->sh_entsize == sizeof (Elf_External_Rel))
2462 Elf_External_Rel *erel;
2463 Elf_External_Rel *erelend;
2464 Elf_Internal_Rela *irela;
2465 Elf_Internal_Rel *irel;
2467 erel = (Elf_External_Rel *) external_relocs;
2468 erelend = erel + NUM_SHDR_ENTRIES (shdr);
2469 irela = internal_relocs;
2470 irel = bfd_alloc (abfd, (bed->s->int_rels_per_ext_rel
2471 * sizeof (Elf_Internal_Rel)));
2472 for (; erel < erelend; erel++, irela += bed->s->int_rels_per_ext_rel)
2476 if (bed->s->swap_reloc_in)
2477 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
2479 elf_swap_reloc_in (abfd, erel, irel);
2481 for (i = 0; i < bed->s->int_rels_per_ext_rel; ++i)
2483 irela[i].r_offset = irel[i].r_offset;
2484 irela[i].r_info = irel[i].r_info;
2485 irela[i].r_addend = 0;
2491 Elf_External_Rela *erela;
2492 Elf_External_Rela *erelaend;
2493 Elf_Internal_Rela *irela;
2495 BFD_ASSERT (shdr->sh_entsize == sizeof (Elf_External_Rela));
2497 erela = (Elf_External_Rela *) external_relocs;
2498 erelaend = erela + NUM_SHDR_ENTRIES (shdr);
2499 irela = internal_relocs;
2500 for (; erela < erelaend; erela++, irela += bed->s->int_rels_per_ext_rel)
2502 if (bed->s->swap_reloca_in)
2503 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
2505 elf_swap_reloca_in (abfd, erela, irela);
2512 /* Read and swap the relocs for a section O. They may have been
2513 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2514 not NULL, they are used as buffers to read into. They are known to
2515 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2516 the return value is allocated using either malloc or bfd_alloc,
2517 according to the KEEP_MEMORY argument. If O has two relocation
2518 sections (both REL and RELA relocations), then the REL_HDR
2519 relocations will appear first in INTERNAL_RELOCS, followed by the
2520 REL_HDR2 relocations. */
2523 NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
2527 PTR external_relocs;
2528 Elf_Internal_Rela *internal_relocs;
2529 boolean keep_memory;
2531 Elf_Internal_Shdr *rel_hdr;
2533 Elf_Internal_Rela *alloc2 = NULL;
2534 struct elf_backend_data *bed = get_elf_backend_data (abfd);
2536 if (elf_section_data (o)->relocs != NULL)
2537 return elf_section_data (o)->relocs;
2539 if (o->reloc_count == 0)
2542 rel_hdr = &elf_section_data (o)->rel_hdr;
2544 if (internal_relocs == NULL)
2548 size = (o->reloc_count * bed->s->int_rels_per_ext_rel
2549 * sizeof (Elf_Internal_Rela));
2551 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2553 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2554 if (internal_relocs == NULL)
2558 if (external_relocs == NULL)
2560 size_t size = (size_t) rel_hdr->sh_size;
2562 if (elf_section_data (o)->rel_hdr2)
2563 size += (size_t) elf_section_data (o)->rel_hdr2->sh_size;
2564 alloc1 = (PTR) bfd_malloc (size);
2567 external_relocs = alloc1;
2570 if (!elf_link_read_relocs_from_section (abfd, rel_hdr,
2574 if (!elf_link_read_relocs_from_section
2576 elf_section_data (o)->rel_hdr2,
2577 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2578 internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
2579 * bed->s->int_rels_per_ext_rel)))
2582 /* Cache the results for next time, if we can. */
2584 elf_section_data (o)->relocs = internal_relocs;
2589 /* Don't free alloc2, since if it was allocated we are passing it
2590 back (under the name of internal_relocs). */
2592 return internal_relocs;
2602 /* Record an assignment to a symbol made by a linker script. We need
2603 this in case some dynamic object refers to this symbol. */
2607 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
2608 bfd *output_bfd ATTRIBUTE_UNUSED;
2609 struct bfd_link_info *info;
2613 struct elf_link_hash_entry *h;
2615 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2618 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
2622 if (h->root.type == bfd_link_hash_new)
2623 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
2625 /* If this symbol is being provided by the linker script, and it is
2626 currently defined by a dynamic object, but not by a regular
2627 object, then mark it as undefined so that the generic linker will
2628 force the correct value. */
2630 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2631 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2632 h->root.type = bfd_link_hash_undefined;
2634 /* If this symbol is not being provided by the linker script, and it is
2635 currently defined by a dynamic object, but not by a regular object,
2636 then clear out any version information because the symbol will not be
2637 associated with the dynamic object any more. */
2639 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2640 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2641 h->verinfo.verdef = NULL;
2643 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2645 /* When possible, keep the original type of the symbol */
2646 if (h->type == STT_NOTYPE)
2647 h->type = STT_OBJECT;
2649 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2650 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
2652 && h->dynindx == -1)
2654 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2657 /* If this is a weak defined symbol, and we know a corresponding
2658 real symbol from the same dynamic object, make sure the real
2659 symbol is also made into a dynamic symbol. */
2660 if (h->weakdef != NULL
2661 && h->weakdef->dynindx == -1)
2663 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2671 /* This structure is used to pass information to
2672 elf_link_assign_sym_version. */
2674 struct elf_assign_sym_version_info
2678 /* General link information. */
2679 struct bfd_link_info *info;
2681 struct bfd_elf_version_tree *verdefs;
2682 /* Whether we are exporting all dynamic symbols. */
2683 boolean export_dynamic;
2684 /* Whether we had a failure. */
2688 /* This structure is used to pass information to
2689 elf_link_find_version_dependencies. */
2691 struct elf_find_verdep_info
2695 /* General link information. */
2696 struct bfd_link_info *info;
2697 /* The number of dependencies. */
2699 /* Whether we had a failure. */
2703 /* Array used to determine the number of hash table buckets to use
2704 based on the number of symbols there are. If there are fewer than
2705 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2706 fewer than 37 we use 17 buckets, and so forth. We never use more
2707 than 32771 buckets. */
2709 static const size_t elf_buckets[] =
2711 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2715 /* Compute bucket count for hashing table. We do not use a static set
2716 of possible tables sizes anymore. Instead we determine for all
2717 possible reasonable sizes of the table the outcome (i.e., the
2718 number of collisions etc) and choose the best solution. The
2719 weighting functions are not too simple to allow the table to grow
2720 without bounds. Instead one of the weighting factors is the size.
2721 Therefore the result is always a good payoff between few collisions
2722 (= short chain lengths) and table size. */
2724 compute_bucket_count (info)
2725 struct bfd_link_info *info;
2727 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
2728 size_t best_size = 0;
2729 unsigned long int *hashcodes;
2730 unsigned long int *hashcodesp;
2731 unsigned long int i;
2733 /* Compute the hash values for all exported symbols. At the same
2734 time store the values in an array so that we could use them for
2736 hashcodes = (unsigned long int *) bfd_malloc (dynsymcount
2737 * sizeof (unsigned long int));
2738 if (hashcodes == NULL)
2740 hashcodesp = hashcodes;
2742 /* Put all hash values in HASHCODES. */
2743 elf_link_hash_traverse (elf_hash_table (info),
2744 elf_collect_hash_codes, &hashcodesp);
2746 /* We have a problem here. The following code to optimize the table
2747 size requires an integer type with more the 32 bits. If
2748 BFD_HOST_U_64_BIT is set we know about such a type. */
2749 #ifdef BFD_HOST_U_64_BIT
2750 if (info->optimize == true)
2752 unsigned long int nsyms = hashcodesp - hashcodes;
2755 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
2756 unsigned long int *counts ;
2758 /* Possible optimization parameters: if we have NSYMS symbols we say
2759 that the hashing table must at least have NSYMS/4 and at most
2761 minsize = nsyms / 4;
2764 best_size = maxsize = nsyms * 2;
2766 /* Create array where we count the collisions in. We must use bfd_malloc
2767 since the size could be large. */
2768 counts = (unsigned long int *) bfd_malloc (maxsize
2769 * sizeof (unsigned long int));
2776 /* Compute the "optimal" size for the hash table. The criteria is a
2777 minimal chain length. The minor criteria is (of course) the size
2779 for (i = minsize; i < maxsize; ++i)
2781 /* Walk through the array of hashcodes and count the collisions. */
2782 BFD_HOST_U_64_BIT max;
2783 unsigned long int j;
2784 unsigned long int fact;
2786 memset (counts, '\0', i * sizeof (unsigned long int));
2788 /* Determine how often each hash bucket is used. */
2789 for (j = 0; j < nsyms; ++j)
2790 ++counts[hashcodes[j] % i];
2792 /* For the weight function we need some information about the
2793 pagesize on the target. This is information need not be 100%
2794 accurate. Since this information is not available (so far) we
2795 define it here to a reasonable default value. If it is crucial
2796 to have a better value some day simply define this value. */
2797 # ifndef BFD_TARGET_PAGESIZE
2798 # define BFD_TARGET_PAGESIZE (4096)
2801 /* We in any case need 2 + NSYMS entries for the size values and
2803 max = (2 + nsyms) * (ARCH_SIZE / 8);
2806 /* Variant 1: optimize for short chains. We add the squares
2807 of all the chain lengths (which favous many small chain
2808 over a few long chains). */
2809 for (j = 0; j < i; ++j)
2810 max += counts[j] * counts[j];
2812 /* This adds penalties for the overall size of the table. */
2813 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2816 /* Variant 2: Optimize a lot more for small table. Here we
2817 also add squares of the size but we also add penalties for
2818 empty slots (the +1 term). */
2819 for (j = 0; j < i; ++j)
2820 max += (1 + counts[j]) * (1 + counts[j]);
2822 /* The overall size of the table is considered, but not as
2823 strong as in variant 1, where it is squared. */
2824 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2828 /* Compare with current best results. */
2829 if (max < best_chlen)
2839 #endif /* defined (BFD_HOST_U_64_BIT) */
2841 /* This is the fallback solution if no 64bit type is available or if we
2842 are not supposed to spend much time on optimizations. We select the
2843 bucket count using a fixed set of numbers. */
2844 for (i = 0; elf_buckets[i] != 0; i++)
2846 best_size = elf_buckets[i];
2847 if (dynsymcount < elf_buckets[i + 1])
2852 /* Free the arrays we needed. */
2858 /* Set up the sizes and contents of the ELF dynamic sections. This is
2859 called by the ELF linker emulation before_allocation routine. We
2860 must set the sizes of the sections before the linker sets the
2861 addresses of the various sections. */
2864 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
2865 export_dynamic, filter_shlib,
2866 auxiliary_filters, info, sinterpptr,
2871 boolean export_dynamic;
2872 const char *filter_shlib;
2873 const char * const *auxiliary_filters;
2874 struct bfd_link_info *info;
2875 asection **sinterpptr;
2876 struct bfd_elf_version_tree *verdefs;
2878 bfd_size_type soname_indx;
2880 struct elf_backend_data *bed;
2881 struct elf_assign_sym_version_info asvinfo;
2885 soname_indx = (bfd_size_type) -1;
2887 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2890 /* The backend may have to create some sections regardless of whether
2891 we're dynamic or not. */
2892 bed = get_elf_backend_data (output_bfd);
2893 if (bed->elf_backend_always_size_sections
2894 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
2897 dynobj = elf_hash_table (info)->dynobj;
2899 /* If there were no dynamic objects in the link, there is nothing to
2904 if (elf_hash_table (info)->dynamic_sections_created)
2906 struct elf_info_failed eif;
2907 struct elf_link_hash_entry *h;
2910 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
2911 BFD_ASSERT (*sinterpptr != NULL || info->shared);
2915 soname_indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2916 soname, true, true);
2917 if (soname_indx == (bfd_size_type) -1
2918 || ! elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
2924 if (! elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
2926 info->flags |= DF_SYMBOLIC;
2933 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, rpath,
2935 if (indx == (bfd_size_type) -1
2936 || ! elf_add_dynamic_entry (info, DT_RPATH, indx)
2938 && ! elf_add_dynamic_entry (info, DT_RUNPATH, indx)))
2942 if (filter_shlib != NULL)
2946 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2947 filter_shlib, true, true);
2948 if (indx == (bfd_size_type) -1
2949 || ! elf_add_dynamic_entry (info, DT_FILTER, indx))
2953 if (auxiliary_filters != NULL)
2955 const char * const *p;
2957 for (p = auxiliary_filters; *p != NULL; p++)
2961 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
2963 if (indx == (bfd_size_type) -1
2964 || ! elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
2972 /* If we are supposed to export all symbols into the dynamic symbol
2973 table (this is not the normal case), then do so. */
2976 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
2982 /* Attach all the symbols to their version information. */
2983 asvinfo.output_bfd = output_bfd;
2984 asvinfo.info = info;
2985 asvinfo.verdefs = verdefs;
2986 asvinfo.export_dynamic = export_dynamic;
2987 asvinfo.failed = false;
2989 elf_link_hash_traverse (elf_hash_table (info),
2990 elf_link_assign_sym_version,
2995 /* Find all symbols which were defined in a dynamic object and make
2996 the backend pick a reasonable value for them. */
2997 elf_link_hash_traverse (elf_hash_table (info),
2998 elf_adjust_dynamic_symbol,
3003 /* Add some entries to the .dynamic section. We fill in some of the
3004 values later, in elf_bfd_final_link, but we must add the entries
3005 now so that we know the final size of the .dynamic section. */
3007 /* If there are initialization and/or finalization functions to
3008 call then add the corresponding DT_INIT/DT_FINI entries. */
3009 h = (info->init_function
3010 ? elf_link_hash_lookup (elf_hash_table (info),
3011 info->init_function, false,
3015 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3016 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3018 if (! elf_add_dynamic_entry (info, DT_INIT, 0))
3021 h = (info->fini_function
3022 ? elf_link_hash_lookup (elf_hash_table (info),
3023 info->fini_function, false,
3027 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3028 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3030 if (! elf_add_dynamic_entry (info, DT_FINI, 0))
3034 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
3035 /* If .dynstr is excluded from the link, we don't want any of
3036 these tags. Strictly, we should be checking each section
3037 individually; This quick check covers for the case where
3038 someone does a /DISCARD/ : { *(*) }. */
3039 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
3041 bfd_size_type strsize;
3043 strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
3044 if (! elf_add_dynamic_entry (info, DT_HASH, 0)
3045 || ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
3046 || ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
3047 || ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
3048 || ! elf_add_dynamic_entry (info, DT_SYMENT,
3049 sizeof (Elf_External_Sym)))
3054 /* The backend must work out the sizes of all the other dynamic
3056 if (bed->elf_backend_size_dynamic_sections
3057 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
3060 if (elf_hash_table (info)->dynamic_sections_created)
3064 size_t bucketcount = 0;
3065 size_t hash_entry_size;
3067 /* Set up the version definition section. */
3068 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3069 BFD_ASSERT (s != NULL);
3071 /* We may have created additional version definitions if we are
3072 just linking a regular application. */
3073 verdefs = asvinfo.verdefs;
3075 if (verdefs == NULL)
3076 _bfd_strip_section_from_output (info, s);
3081 struct bfd_elf_version_tree *t;
3083 Elf_Internal_Verdef def;
3084 Elf_Internal_Verdaux defaux;
3089 /* Make space for the base version. */
3090 size += sizeof (Elf_External_Verdef);
3091 size += sizeof (Elf_External_Verdaux);
3094 for (t = verdefs; t != NULL; t = t->next)
3096 struct bfd_elf_version_deps *n;
3098 size += sizeof (Elf_External_Verdef);
3099 size += sizeof (Elf_External_Verdaux);
3102 for (n = t->deps; n != NULL; n = n->next)
3103 size += sizeof (Elf_External_Verdaux);
3106 s->_raw_size = size;
3107 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3108 if (s->contents == NULL && s->_raw_size != 0)
3111 /* Fill in the version definition section. */
3115 def.vd_version = VER_DEF_CURRENT;
3116 def.vd_flags = VER_FLG_BASE;
3119 def.vd_aux = sizeof (Elf_External_Verdef);
3120 def.vd_next = (sizeof (Elf_External_Verdef)
3121 + sizeof (Elf_External_Verdaux));
3123 if (soname_indx != (bfd_size_type) -1)
3125 def.vd_hash = bfd_elf_hash (soname);
3126 defaux.vda_name = soname_indx;
3133 name = basename (output_bfd->filename);
3134 def.vd_hash = bfd_elf_hash (name);
3135 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3137 if (indx == (bfd_size_type) -1)
3139 defaux.vda_name = indx;
3141 defaux.vda_next = 0;
3143 _bfd_elf_swap_verdef_out (output_bfd, &def,
3144 (Elf_External_Verdef *)p);
3145 p += sizeof (Elf_External_Verdef);
3146 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3147 (Elf_External_Verdaux *) p);
3148 p += sizeof (Elf_External_Verdaux);
3150 for (t = verdefs; t != NULL; t = t->next)
3153 struct bfd_elf_version_deps *n;
3154 struct elf_link_hash_entry *h;
3157 for (n = t->deps; n != NULL; n = n->next)
3160 /* Add a symbol representing this version. */
3162 if (! (_bfd_generic_link_add_one_symbol
3163 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
3164 (bfd_vma) 0, (const char *) NULL, false,
3165 get_elf_backend_data (dynobj)->collect,
3166 (struct bfd_link_hash_entry **) &h)))
3168 h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
3169 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3170 h->type = STT_OBJECT;
3171 h->verinfo.vertree = t;
3173 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
3176 def.vd_version = VER_DEF_CURRENT;
3178 if (t->globals == NULL && t->locals == NULL && ! t->used)
3179 def.vd_flags |= VER_FLG_WEAK;
3180 def.vd_ndx = t->vernum + 1;
3181 def.vd_cnt = cdeps + 1;
3182 def.vd_hash = bfd_elf_hash (t->name);
3183 def.vd_aux = sizeof (Elf_External_Verdef);
3184 if (t->next != NULL)
3185 def.vd_next = (sizeof (Elf_External_Verdef)
3186 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
3190 _bfd_elf_swap_verdef_out (output_bfd, &def,
3191 (Elf_External_Verdef *) p);
3192 p += sizeof (Elf_External_Verdef);
3194 defaux.vda_name = h->dynstr_index;
3195 if (t->deps == NULL)
3196 defaux.vda_next = 0;
3198 defaux.vda_next = sizeof (Elf_External_Verdaux);
3199 t->name_indx = defaux.vda_name;
3201 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3202 (Elf_External_Verdaux *) p);
3203 p += sizeof (Elf_External_Verdaux);
3205 for (n = t->deps; n != NULL; n = n->next)
3207 if (n->version_needed == NULL)
3209 /* This can happen if there was an error in the
3211 defaux.vda_name = 0;
3214 defaux.vda_name = n->version_needed->name_indx;
3215 if (n->next == NULL)
3216 defaux.vda_next = 0;
3218 defaux.vda_next = sizeof (Elf_External_Verdaux);
3220 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3221 (Elf_External_Verdaux *) p);
3222 p += sizeof (Elf_External_Verdaux);
3226 if (! elf_add_dynamic_entry (info, DT_VERDEF, 0)
3227 || ! elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
3230 elf_tdata (output_bfd)->cverdefs = cdefs;
3233 if (info->new_dtags && info->flags)
3235 if (! elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
3242 info->flags_1 &= ~ (DF_1_INITFIRST
3245 if (! elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
3249 /* Work out the size of the version reference section. */
3251 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3252 BFD_ASSERT (s != NULL);
3254 struct elf_find_verdep_info sinfo;
3256 sinfo.output_bfd = output_bfd;
3258 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
3259 if (sinfo.vers == 0)
3261 sinfo.failed = false;
3263 elf_link_hash_traverse (elf_hash_table (info),
3264 elf_link_find_version_dependencies,
3267 if (elf_tdata (output_bfd)->verref == NULL)
3268 _bfd_strip_section_from_output (info, s);
3271 Elf_Internal_Verneed *t;
3276 /* Build the version definition section. */
3279 for (t = elf_tdata (output_bfd)->verref;
3283 Elf_Internal_Vernaux *a;
3285 size += sizeof (Elf_External_Verneed);
3287 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3288 size += sizeof (Elf_External_Vernaux);
3291 s->_raw_size = size;
3292 s->contents = (bfd_byte *) bfd_alloc (output_bfd, size);
3293 if (s->contents == NULL)
3297 for (t = elf_tdata (output_bfd)->verref;
3302 Elf_Internal_Vernaux *a;
3306 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3309 t->vn_version = VER_NEED_CURRENT;
3311 if (elf_dt_name (t->vn_bfd) != NULL)
3312 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3313 elf_dt_name (t->vn_bfd),
3316 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3317 basename (t->vn_bfd->filename),
3319 if (indx == (bfd_size_type) -1)
3322 t->vn_aux = sizeof (Elf_External_Verneed);
3323 if (t->vn_nextref == NULL)
3326 t->vn_next = (sizeof (Elf_External_Verneed)
3327 + caux * sizeof (Elf_External_Vernaux));
3329 _bfd_elf_swap_verneed_out (output_bfd, t,
3330 (Elf_External_Verneed *) p);
3331 p += sizeof (Elf_External_Verneed);
3333 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3335 a->vna_hash = bfd_elf_hash (a->vna_nodename);
3336 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr,
3337 a->vna_nodename, true, false);
3338 if (indx == (bfd_size_type) -1)
3341 if (a->vna_nextptr == NULL)
3344 a->vna_next = sizeof (Elf_External_Vernaux);
3346 _bfd_elf_swap_vernaux_out (output_bfd, a,
3347 (Elf_External_Vernaux *) p);
3348 p += sizeof (Elf_External_Vernaux);
3352 if (! elf_add_dynamic_entry (info, DT_VERNEED, 0)
3353 || ! elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
3356 elf_tdata (output_bfd)->cverrefs = crefs;
3360 /* Assign dynsym indicies. In a shared library we generate a
3361 section symbol for each output section, which come first.
3362 Next come all of the back-end allocated local dynamic syms,
3363 followed by the rest of the global symbols. */
3365 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3367 /* Work out the size of the symbol version section. */
3368 s = bfd_get_section_by_name (dynobj, ".gnu.version");
3369 BFD_ASSERT (s != NULL);
3370 if (dynsymcount == 0
3371 || (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
3373 _bfd_strip_section_from_output (info, s);
3374 /* The DYNSYMCOUNT might have changed if we were going to
3375 output a dynamic symbol table entry for S. */
3376 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3380 s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
3381 s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3382 if (s->contents == NULL)
3385 if (! elf_add_dynamic_entry (info, DT_VERSYM, 0))
3389 /* Set the size of the .dynsym and .hash sections. We counted
3390 the number of dynamic symbols in elf_link_add_object_symbols.
3391 We will build the contents of .dynsym and .hash when we build
3392 the final symbol table, because until then we do not know the
3393 correct value to give the symbols. We built the .dynstr
3394 section as we went along in elf_link_add_object_symbols. */
3395 s = bfd_get_section_by_name (dynobj, ".dynsym");
3396 BFD_ASSERT (s != NULL);
3397 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
3398 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3399 if (s->contents == NULL && s->_raw_size != 0)
3402 if (dynsymcount != 0)
3404 Elf_Internal_Sym isym;
3406 /* The first entry in .dynsym is a dummy symbol. */
3413 elf_swap_symbol_out (output_bfd, &isym,
3414 (PTR) (Elf_External_Sym *) s->contents);
3417 /* Compute the size of the hashing table. As a side effect this
3418 computes the hash values for all the names we export. */
3419 bucketcount = compute_bucket_count (info);
3421 s = bfd_get_section_by_name (dynobj, ".hash");
3422 BFD_ASSERT (s != NULL);
3423 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
3424 s->_raw_size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
3425 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3426 if (s->contents == NULL)
3428 memset (s->contents, 0, (size_t) s->_raw_size);
3430 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
3431 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
3432 s->contents + hash_entry_size);
3434 elf_hash_table (info)->bucketcount = bucketcount;
3436 s = bfd_get_section_by_name (dynobj, ".dynstr");
3437 BFD_ASSERT (s != NULL);
3438 s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
3440 if (! elf_add_dynamic_entry (info, DT_NULL, 0))
3447 /* Fix up the flags for a symbol. This handles various cases which
3448 can only be fixed after all the input files are seen. This is
3449 currently called by both adjust_dynamic_symbol and
3450 assign_sym_version, which is unnecessary but perhaps more robust in
3451 the face of future changes. */
3454 elf_fix_symbol_flags (h, eif)
3455 struct elf_link_hash_entry *h;
3456 struct elf_info_failed *eif;
3458 /* If this symbol was mentioned in a non-ELF file, try to set
3459 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3460 permit a non-ELF file to correctly refer to a symbol defined in
3461 an ELF dynamic object. */
3462 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
3464 while (h->root.type == bfd_link_hash_indirect)
3465 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3467 if (h->root.type != bfd_link_hash_defined
3468 && h->root.type != bfd_link_hash_defweak)
3469 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3470 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3473 if (h->root.u.def.section->owner != NULL
3474 && (bfd_get_flavour (h->root.u.def.section->owner)
3475 == bfd_target_elf_flavour))
3476 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3477 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3479 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3482 if (h->dynindx == -1
3483 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3484 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
3486 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3495 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3496 was first seen in a non-ELF file. Fortunately, if the symbol
3497 was first seen in an ELF file, we're probably OK unless the
3498 symbol was defined in a non-ELF file. Catch that case here.
3499 FIXME: We're still in trouble if the symbol was first seen in
3500 a dynamic object, and then later in a non-ELF regular object. */
3501 if ((h->root.type == bfd_link_hash_defined
3502 || h->root.type == bfd_link_hash_defweak)
3503 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3504 && (h->root.u.def.section->owner != NULL
3505 ? (bfd_get_flavour (h->root.u.def.section->owner)
3506 != bfd_target_elf_flavour)
3507 : (bfd_is_abs_section (h->root.u.def.section)
3508 && (h->elf_link_hash_flags
3509 & ELF_LINK_HASH_DEF_DYNAMIC) == 0)))
3510 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3513 /* If this is a final link, and the symbol was defined as a common
3514 symbol in a regular object file, and there was no definition in
3515 any dynamic object, then the linker will have allocated space for
3516 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3517 flag will not have been set. */
3518 if (h->root.type == bfd_link_hash_defined
3519 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3520 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
3521 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3522 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
3523 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3525 /* If -Bsymbolic was used (which means to bind references to global
3526 symbols to the definition within the shared object), and this
3527 symbol was defined in a regular object, then it actually doesn't
3528 need a PLT entry, and we can accomplish that by forcing it local.
3529 Likewise, if the symbol has hidden or internal visibility.
3530 FIXME: It might be that we also do not need a PLT for other
3531 non-hidden visibilities, but we would have to tell that to the
3532 backend specifically; we can't just clear PLT-related data here. */
3533 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
3534 && eif->info->shared
3535 && (eif->info->symbolic
3536 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3537 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
3538 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3540 struct elf_backend_data *bed;
3541 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3542 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3543 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
3544 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
3545 (*bed->elf_backend_hide_symbol) (eif->info, h);
3548 /* If this is a weak defined symbol in a dynamic object, and we know
3549 the real definition in the dynamic object, copy interesting flags
3550 over to the real definition. */
3551 if (h->weakdef != NULL)
3553 struct elf_link_hash_entry *weakdef;
3555 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3556 || h->root.type == bfd_link_hash_defweak);
3557 weakdef = h->weakdef;
3558 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
3559 || weakdef->root.type == bfd_link_hash_defweak);
3560 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
3562 /* If the real definition is defined by a regular object file,
3563 don't do anything special. See the longer description in
3564 elf_adjust_dynamic_symbol, below. */
3565 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3568 weakdef->elf_link_hash_flags |=
3569 (h->elf_link_hash_flags
3570 & (ELF_LINK_HASH_REF_REGULAR
3571 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3572 | ELF_LINK_NON_GOT_REF));
3578 /* Make the backend pick a good value for a dynamic symbol. This is
3579 called via elf_link_hash_traverse, and also calls itself
3583 elf_adjust_dynamic_symbol (h, data)
3584 struct elf_link_hash_entry *h;
3587 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3589 struct elf_backend_data *bed;
3591 /* Ignore indirect symbols. These are added by the versioning code. */
3592 if (h->root.type == bfd_link_hash_indirect)
3595 /* Fix the symbol flags. */
3596 if (! elf_fix_symbol_flags (h, eif))
3599 /* If this symbol does not require a PLT entry, and it is not
3600 defined by a dynamic object, or is not referenced by a regular
3601 object, ignore it. We do have to handle a weak defined symbol,
3602 even if no regular object refers to it, if we decided to add it
3603 to the dynamic symbol table. FIXME: Do we normally need to worry
3604 about symbols which are defined by one dynamic object and
3605 referenced by another one? */
3606 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
3607 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3608 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3609 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
3610 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
3612 h->plt.offset = (bfd_vma) -1;
3616 /* If we've already adjusted this symbol, don't do it again. This
3617 can happen via a recursive call. */
3618 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
3621 /* Don't look at this symbol again. Note that we must set this
3622 after checking the above conditions, because we may look at a
3623 symbol once, decide not to do anything, and then get called
3624 recursively later after REF_REGULAR is set below. */
3625 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
3627 /* If this is a weak definition, and we know a real definition, and
3628 the real symbol is not itself defined by a regular object file,
3629 then get a good value for the real definition. We handle the
3630 real symbol first, for the convenience of the backend routine.
3632 Note that there is a confusing case here. If the real definition
3633 is defined by a regular object file, we don't get the real symbol
3634 from the dynamic object, but we do get the weak symbol. If the
3635 processor backend uses a COPY reloc, then if some routine in the
3636 dynamic object changes the real symbol, we will not see that
3637 change in the corresponding weak symbol. This is the way other
3638 ELF linkers work as well, and seems to be a result of the shared
3641 I will clarify this issue. Most SVR4 shared libraries define the
3642 variable _timezone and define timezone as a weak synonym. The
3643 tzset call changes _timezone. If you write
3644 extern int timezone;
3646 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3647 you might expect that, since timezone is a synonym for _timezone,
3648 the same number will print both times. However, if the processor
3649 backend uses a COPY reloc, then actually timezone will be copied
3650 into your process image, and, since you define _timezone
3651 yourself, _timezone will not. Thus timezone and _timezone will
3652 wind up at different memory locations. The tzset call will set
3653 _timezone, leaving timezone unchanged. */
3655 if (h->weakdef != NULL)
3657 /* If we get to this point, we know there is an implicit
3658 reference by a regular object file via the weak symbol H.
3659 FIXME: Is this really true? What if the traversal finds
3660 H->WEAKDEF before it finds H? */
3661 h->weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
3663 if (! elf_adjust_dynamic_symbol (h->weakdef, (PTR) eif))
3667 /* If a symbol has no type and no size and does not require a PLT
3668 entry, then we are probably about to do the wrong thing here: we
3669 are probably going to create a COPY reloc for an empty object.
3670 This case can arise when a shared object is built with assembly
3671 code, and the assembly code fails to set the symbol type. */
3673 && h->type == STT_NOTYPE
3674 && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0)
3675 (*_bfd_error_handler)
3676 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3677 h->root.root.string);
3679 dynobj = elf_hash_table (eif->info)->dynobj;
3680 bed = get_elf_backend_data (dynobj);
3681 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
3690 /* This routine is used to export all defined symbols into the dynamic
3691 symbol table. It is called via elf_link_hash_traverse. */
3694 elf_export_symbol (h, data)
3695 struct elf_link_hash_entry *h;
3698 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3700 /* Ignore indirect symbols. These are added by the versioning code. */
3701 if (h->root.type == bfd_link_hash_indirect)
3704 if (h->dynindx == -1
3705 && (h->elf_link_hash_flags
3706 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
3708 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3718 /* Look through the symbols which are defined in other shared
3719 libraries and referenced here. Update the list of version
3720 dependencies. This will be put into the .gnu.version_r section.
3721 This function is called via elf_link_hash_traverse. */
3724 elf_link_find_version_dependencies (h, data)
3725 struct elf_link_hash_entry *h;
3728 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
3729 Elf_Internal_Verneed *t;
3730 Elf_Internal_Vernaux *a;
3732 /* We only care about symbols defined in shared objects with version
3734 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3735 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3737 || h->verinfo.verdef == NULL)
3740 /* See if we already know about this version. */
3741 for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
3743 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
3746 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3747 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
3753 /* This is a new version. Add it to tree we are building. */
3757 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, sizeof *t);
3760 rinfo->failed = true;
3764 t->vn_bfd = h->verinfo.verdef->vd_bfd;
3765 t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
3766 elf_tdata (rinfo->output_bfd)->verref = t;
3769 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, sizeof *a);
3771 /* Note that we are copying a string pointer here, and testing it
3772 above. If bfd_elf_string_from_elf_section is ever changed to
3773 discard the string data when low in memory, this will have to be
3775 a->vna_nodename = h->verinfo.verdef->vd_nodename;
3777 a->vna_flags = h->verinfo.verdef->vd_flags;
3778 a->vna_nextptr = t->vn_auxptr;
3780 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
3783 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
3790 /* Figure out appropriate versions for all the symbols. We may not
3791 have the version number script until we have read all of the input
3792 files, so until that point we don't know which symbols should be
3793 local. This function is called via elf_link_hash_traverse. */
3796 elf_link_assign_sym_version (h, data)
3797 struct elf_link_hash_entry *h;
3800 struct elf_assign_sym_version_info *sinfo =
3801 (struct elf_assign_sym_version_info *) data;
3802 struct bfd_link_info *info = sinfo->info;
3803 struct elf_backend_data *bed;
3804 struct elf_info_failed eif;
3807 /* Fix the symbol flags. */
3810 if (! elf_fix_symbol_flags (h, &eif))
3813 sinfo->failed = true;
3817 /* We only need version numbers for symbols defined in regular
3819 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3822 bed = get_elf_backend_data (sinfo->output_bfd);
3823 p = strchr (h->root.root.string, ELF_VER_CHR);
3824 if (p != NULL && h->verinfo.vertree == NULL)
3826 struct bfd_elf_version_tree *t;
3831 /* There are two consecutive ELF_VER_CHR characters if this is
3832 not a hidden symbol. */
3834 if (*p == ELF_VER_CHR)
3840 /* If there is no version string, we can just return out. */
3844 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
3848 /* Look for the version. If we find it, it is no longer weak. */
3849 for (t = sinfo->verdefs; t != NULL; t = t->next)
3851 if (strcmp (t->name, p) == 0)
3855 struct bfd_elf_version_expr *d;
3857 len = p - h->root.root.string;
3858 alc = bfd_alloc (sinfo->output_bfd, len);
3861 strncpy (alc, h->root.root.string, len - 1);
3862 alc[len - 1] = '\0';
3863 if (alc[len - 2] == ELF_VER_CHR)
3864 alc[len - 2] = '\0';
3866 h->verinfo.vertree = t;
3870 if (t->globals != NULL)
3872 for (d = t->globals; d != NULL; d = d->next)
3873 if ((*d->match) (d, alc))
3877 /* See if there is anything to force this symbol to
3879 if (d == NULL && t->locals != NULL)
3881 for (d = t->locals; d != NULL; d = d->next)
3883 if ((*d->match) (d, alc))
3885 if (h->dynindx != -1
3887 && ! sinfo->export_dynamic)
3889 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
3890 (*bed->elf_backend_hide_symbol) (info, h);
3891 /* FIXME: The name of the symbol has
3892 already been recorded in the dynamic
3893 string table section. */
3901 bfd_release (sinfo->output_bfd, alc);
3906 /* If we are building an application, we need to create a
3907 version node for this version. */
3908 if (t == NULL && ! info->shared)
3910 struct bfd_elf_version_tree **pp;
3913 /* If we aren't going to export this symbol, we don't need
3914 to worry about it. */
3915 if (h->dynindx == -1)
3918 t = ((struct bfd_elf_version_tree *)
3919 bfd_alloc (sinfo->output_bfd, sizeof *t));
3922 sinfo->failed = true;
3931 t->name_indx = (unsigned int) -1;
3935 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
3937 t->vernum = version_index;
3941 h->verinfo.vertree = t;
3945 /* We could not find the version for a symbol when
3946 generating a shared archive. Return an error. */
3947 (*_bfd_error_handler)
3948 (_("%s: undefined versioned symbol name %s"),
3949 bfd_get_filename (sinfo->output_bfd), h->root.root.string);
3950 bfd_set_error (bfd_error_bad_value);
3951 sinfo->failed = true;
3956 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
3959 /* If we don't have a version for this symbol, see if we can find
3961 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
3963 struct bfd_elf_version_tree *t;
3964 struct bfd_elf_version_tree *deflt;
3965 struct bfd_elf_version_expr *d;
3967 /* See if can find what version this symbol is in. If the
3968 symbol is supposed to be local, then don't actually register
3971 for (t = sinfo->verdefs; t != NULL; t = t->next)
3973 if (t->globals != NULL)
3975 for (d = t->globals; d != NULL; d = d->next)
3977 if ((*d->match) (d, h->root.root.string))
3979 h->verinfo.vertree = t;
3988 if (t->locals != NULL)
3990 for (d = t->locals; d != NULL; d = d->next)
3992 if (d->pattern[0] == '*' && d->pattern[1] == '\0')
3994 else if ((*d->match) (d, h->root.root.string))
3996 h->verinfo.vertree = t;
3997 if (h->dynindx != -1
3999 && ! sinfo->export_dynamic)
4001 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
4002 (*bed->elf_backend_hide_symbol) (info, h);
4003 /* FIXME: The name of the symbol has already
4004 been recorded in the dynamic string table
4016 if (deflt != NULL && h->verinfo.vertree == NULL)
4018 h->verinfo.vertree = deflt;
4019 if (h->dynindx != -1
4021 && ! sinfo->export_dynamic)
4023 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
4024 (*bed->elf_backend_hide_symbol) (info, h);
4025 /* FIXME: The name of the symbol has already been
4026 recorded in the dynamic string table section. */
4034 /* Final phase of ELF linker. */
4036 /* A structure we use to avoid passing large numbers of arguments. */
4038 struct elf_final_link_info
4040 /* General link information. */
4041 struct bfd_link_info *info;
4044 /* Symbol string table. */
4045 struct bfd_strtab_hash *symstrtab;
4046 /* .dynsym section. */
4047 asection *dynsym_sec;
4048 /* .hash section. */
4050 /* symbol version section (.gnu.version). */
4051 asection *symver_sec;
4052 /* Buffer large enough to hold contents of any section. */
4054 /* Buffer large enough to hold external relocs of any section. */
4055 PTR external_relocs;
4056 /* Buffer large enough to hold internal relocs of any section. */
4057 Elf_Internal_Rela *internal_relocs;
4058 /* Buffer large enough to hold external local symbols of any input
4060 Elf_External_Sym *external_syms;
4061 /* Buffer large enough to hold internal local symbols of any input
4063 Elf_Internal_Sym *internal_syms;
4064 /* Array large enough to hold a symbol index for each local symbol
4065 of any input BFD. */
4067 /* Array large enough to hold a section pointer for each local
4068 symbol of any input BFD. */
4069 asection **sections;
4070 /* Buffer to hold swapped out symbols. */
4071 Elf_External_Sym *symbuf;
4072 /* Number of swapped out symbols in buffer. */
4073 size_t symbuf_count;
4074 /* Number of symbols which fit in symbuf. */
4078 static boolean elf_link_output_sym
4079 PARAMS ((struct elf_final_link_info *, const char *,
4080 Elf_Internal_Sym *, asection *));
4081 static boolean elf_link_flush_output_syms
4082 PARAMS ((struct elf_final_link_info *));
4083 static boolean elf_link_output_extsym
4084 PARAMS ((struct elf_link_hash_entry *, PTR));
4085 static boolean elf_link_sec_merge_syms
4086 PARAMS ((struct elf_link_hash_entry *, PTR));
4087 static boolean elf_link_input_bfd
4088 PARAMS ((struct elf_final_link_info *, bfd *));
4089 static boolean elf_reloc_link_order
4090 PARAMS ((bfd *, struct bfd_link_info *, asection *,
4091 struct bfd_link_order *));
4093 /* This struct is used to pass information to elf_link_output_extsym. */
4095 struct elf_outext_info
4099 struct elf_final_link_info *finfo;
4102 /* Compute the size of, and allocate space for, REL_HDR which is the
4103 section header for a section containing relocations for O. */
4106 elf_link_size_reloc_section (abfd, rel_hdr, o)
4108 Elf_Internal_Shdr *rel_hdr;
4111 unsigned reloc_count;
4113 /* Figure out how many relocations there will be. */
4114 if (rel_hdr == &elf_section_data (o)->rel_hdr)
4115 reloc_count = elf_section_data (o)->rel_count;
4117 reloc_count = elf_section_data (o)->rel_count2;
4119 /* That allows us to calculate the size of the section. */
4120 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
4122 /* The contents field must last into write_object_contents, so we
4123 allocate it with bfd_alloc rather than malloc. Also since we
4124 cannot be sure that the contents will actually be filled in,
4125 we zero the allocated space. */
4126 rel_hdr->contents = (PTR) bfd_zalloc (abfd, rel_hdr->sh_size);
4127 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
4130 /* We only allocate one set of hash entries, so we only do it the
4131 first time we are called. */
4132 if (elf_section_data (o)->rel_hashes == NULL)
4134 struct elf_link_hash_entry **p;
4136 p = ((struct elf_link_hash_entry **)
4137 bfd_zmalloc (o->reloc_count
4138 * sizeof (struct elf_link_hash_entry *)));
4139 if (p == NULL && o->reloc_count != 0)
4142 elf_section_data (o)->rel_hashes = p;
4148 /* When performing a relocateable link, the input relocations are
4149 preserved. But, if they reference global symbols, the indices
4150 referenced must be updated. Update all the relocations in
4151 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4154 elf_link_adjust_relocs (abfd, rel_hdr, count, rel_hash)
4156 Elf_Internal_Shdr *rel_hdr;
4158 struct elf_link_hash_entry **rel_hash;
4161 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4162 Elf_Internal_Rel *irel;
4163 Elf_Internal_Rela *irela;
4165 irel = (Elf_Internal_Rel *) bfd_zmalloc (sizeof (Elf_Internal_Rel)
4166 * bed->s->int_rels_per_ext_rel);
4169 (*_bfd_error_handler) (_("Error: out of memory"));
4173 irela = (Elf_Internal_Rela *) bfd_zmalloc (sizeof (Elf_Internal_Rela)
4174 * bed->s->int_rels_per_ext_rel);
4177 (*_bfd_error_handler) (_("Error: out of memory"));
4181 for (i = 0; i < count; i++, rel_hash++)
4183 if (*rel_hash == NULL)
4186 BFD_ASSERT ((*rel_hash)->indx >= 0);
4188 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
4190 Elf_External_Rel *erel;
4193 erel = (Elf_External_Rel *) rel_hdr->contents + i;
4194 if (bed->s->swap_reloc_in)
4195 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
4197 elf_swap_reloc_in (abfd, erel, irel);
4199 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4200 irel[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4201 ELF_R_TYPE (irel[j].r_info));
4203 if (bed->s->swap_reloc_out)
4204 (*bed->s->swap_reloc_out) (abfd, irel, (bfd_byte *) erel);
4206 elf_swap_reloc_out (abfd, irel, erel);
4210 Elf_External_Rela *erela;
4213 BFD_ASSERT (rel_hdr->sh_entsize
4214 == sizeof (Elf_External_Rela));
4216 erela = (Elf_External_Rela *) rel_hdr->contents + i;
4217 if (bed->s->swap_reloca_in)
4218 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
4220 elf_swap_reloca_in (abfd, erela, irela);
4222 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4223 irela[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4224 ELF_R_TYPE (irela[j].r_info));
4226 if (bed->s->swap_reloca_out)
4227 (*bed->s->swap_reloca_out) (abfd, irela, (bfd_byte *) erela);
4229 elf_swap_reloca_out (abfd, irela, erela);
4237 /* Do the final step of an ELF link. */
4240 elf_bfd_final_link (abfd, info)
4242 struct bfd_link_info *info;
4246 struct elf_final_link_info finfo;
4247 register asection *o;
4248 register struct bfd_link_order *p;
4250 size_t max_contents_size;
4251 size_t max_external_reloc_size;
4252 size_t max_internal_reloc_count;
4253 size_t max_sym_count;
4255 Elf_Internal_Sym elfsym;
4257 Elf_Internal_Shdr *symtab_hdr;
4258 Elf_Internal_Shdr *symstrtab_hdr;
4259 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4260 struct elf_outext_info eoinfo;
4264 abfd->flags |= DYNAMIC;
4266 dynamic = elf_hash_table (info)->dynamic_sections_created;
4267 dynobj = elf_hash_table (info)->dynobj;
4270 finfo.output_bfd = abfd;
4271 finfo.symstrtab = elf_stringtab_init ();
4272 if (finfo.symstrtab == NULL)
4277 finfo.dynsym_sec = NULL;
4278 finfo.hash_sec = NULL;
4279 finfo.symver_sec = NULL;
4283 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
4284 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
4285 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
4286 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
4287 /* Note that it is OK if symver_sec is NULL. */
4290 finfo.contents = NULL;
4291 finfo.external_relocs = NULL;
4292 finfo.internal_relocs = NULL;
4293 finfo.external_syms = NULL;
4294 finfo.internal_syms = NULL;
4295 finfo.indices = NULL;
4296 finfo.sections = NULL;
4297 finfo.symbuf = NULL;
4298 finfo.symbuf_count = 0;
4300 /* Count up the number of relocations we will output for each output
4301 section, so that we know the sizes of the reloc sections. We
4302 also figure out some maximum sizes. */
4303 max_contents_size = 0;
4304 max_external_reloc_size = 0;
4305 max_internal_reloc_count = 0;
4308 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4312 for (p = o->link_order_head; p != NULL; p = p->next)
4314 if (p->type == bfd_section_reloc_link_order
4315 || p->type == bfd_symbol_reloc_link_order)
4317 else if (p->type == bfd_indirect_link_order)
4321 sec = p->u.indirect.section;
4323 /* Mark all sections which are to be included in the
4324 link. This will normally be every section. We need
4325 to do this so that we can identify any sections which
4326 the linker has decided to not include. */
4327 sec->linker_mark = true;
4329 if (sec->flags & SEC_MERGE)
4332 if (info->relocateable || info->emitrelocations)
4333 o->reloc_count += sec->reloc_count;
4335 if (sec->_raw_size > max_contents_size)
4336 max_contents_size = sec->_raw_size;
4337 if (sec->_cooked_size > max_contents_size)
4338 max_contents_size = sec->_cooked_size;
4340 /* We are interested in just local symbols, not all
4342 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
4343 && (sec->owner->flags & DYNAMIC) == 0)
4347 if (elf_bad_symtab (sec->owner))
4348 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
4349 / sizeof (Elf_External_Sym));
4351 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
4353 if (sym_count > max_sym_count)
4354 max_sym_count = sym_count;
4356 if ((sec->flags & SEC_RELOC) != 0)
4360 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
4361 if (ext_size > max_external_reloc_size)
4362 max_external_reloc_size = ext_size;
4363 if (sec->reloc_count > max_internal_reloc_count)
4364 max_internal_reloc_count = sec->reloc_count;
4370 if (o->reloc_count > 0)
4371 o->flags |= SEC_RELOC;
4374 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4375 set it (this is probably a bug) and if it is set
4376 assign_section_numbers will create a reloc section. */
4377 o->flags &=~ SEC_RELOC;
4380 /* If the SEC_ALLOC flag is not set, force the section VMA to
4381 zero. This is done in elf_fake_sections as well, but forcing
4382 the VMA to 0 here will ensure that relocs against these
4383 sections are handled correctly. */
4384 if ((o->flags & SEC_ALLOC) == 0
4385 && ! o->user_set_vma)
4389 if (! info->relocateable && merged)
4390 elf_link_hash_traverse (elf_hash_table (info),
4391 elf_link_sec_merge_syms, (PTR) abfd);
4393 /* Figure out the file positions for everything but the symbol table
4394 and the relocs. We set symcount to force assign_section_numbers
4395 to create a symbol table. */
4396 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
4397 BFD_ASSERT (! abfd->output_has_begun);
4398 if (! _bfd_elf_compute_section_file_positions (abfd, info))
4401 /* Figure out how many relocations we will have in each section.
4402 Just using RELOC_COUNT isn't good enough since that doesn't
4403 maintain a separate value for REL vs. RELA relocations. */
4404 if (info->relocateable || info->emitrelocations)
4405 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
4406 for (o = sub->sections; o != NULL; o = o->next)
4408 asection *output_section;
4410 if (! o->linker_mark)
4412 /* This section was omitted from the link. */
4416 output_section = o->output_section;
4418 if (output_section != NULL
4419 && (o->flags & SEC_RELOC) != 0)
4421 struct bfd_elf_section_data *esdi
4422 = elf_section_data (o);
4423 struct bfd_elf_section_data *esdo
4424 = elf_section_data (output_section);
4425 unsigned int *rel_count;
4426 unsigned int *rel_count2;
4428 /* We must be careful to add the relocation froms the
4429 input section to the right output count. */
4430 if (esdi->rel_hdr.sh_entsize == esdo->rel_hdr.sh_entsize)
4432 rel_count = &esdo->rel_count;
4433 rel_count2 = &esdo->rel_count2;
4437 rel_count = &esdo->rel_count2;
4438 rel_count2 = &esdo->rel_count;
4441 *rel_count += NUM_SHDR_ENTRIES (& esdi->rel_hdr);
4443 *rel_count2 += NUM_SHDR_ENTRIES (esdi->rel_hdr2);
4447 /* That created the reloc sections. Set their sizes, and assign
4448 them file positions, and allocate some buffers. */
4449 for (o = abfd->sections; o != NULL; o = o->next)
4451 if ((o->flags & SEC_RELOC) != 0)
4453 if (!elf_link_size_reloc_section (abfd,
4454 &elf_section_data (o)->rel_hdr,
4458 if (elf_section_data (o)->rel_hdr2
4459 && !elf_link_size_reloc_section (abfd,
4460 elf_section_data (o)->rel_hdr2,
4465 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4466 to count upwards while actually outputting the relocations. */
4467 elf_section_data (o)->rel_count = 0;
4468 elf_section_data (o)->rel_count2 = 0;
4471 _bfd_elf_assign_file_positions_for_relocs (abfd);
4473 /* We have now assigned file positions for all the sections except
4474 .symtab and .strtab. We start the .symtab section at the current
4475 file position, and write directly to it. We build the .strtab
4476 section in memory. */
4477 bfd_get_symcount (abfd) = 0;
4478 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
4479 /* sh_name is set in prep_headers. */
4480 symtab_hdr->sh_type = SHT_SYMTAB;
4481 symtab_hdr->sh_flags = 0;
4482 symtab_hdr->sh_addr = 0;
4483 symtab_hdr->sh_size = 0;
4484 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
4485 /* sh_link is set in assign_section_numbers. */
4486 /* sh_info is set below. */
4487 /* sh_offset is set just below. */
4488 symtab_hdr->sh_addralign = bed->s->file_align;
4490 off = elf_tdata (abfd)->next_file_pos;
4491 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
4493 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4494 incorrect. We do not yet know the size of the .symtab section.
4495 We correct next_file_pos below, after we do know the size. */
4497 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4498 continuously seeking to the right position in the file. */
4499 if (! info->keep_memory || max_sym_count < 20)
4500 finfo.symbuf_size = 20;
4502 finfo.symbuf_size = max_sym_count;
4503 finfo.symbuf = ((Elf_External_Sym *)
4504 bfd_malloc (finfo.symbuf_size * sizeof (Elf_External_Sym)));
4505 if (finfo.symbuf == NULL)
4508 /* Start writing out the symbol table. The first symbol is always a
4510 if (info->strip != strip_all || info->relocateable || info->emitrelocations)
4512 elfsym.st_value = 0;
4515 elfsym.st_other = 0;
4516 elfsym.st_shndx = SHN_UNDEF;
4517 if (! elf_link_output_sym (&finfo, (const char *) NULL,
4518 &elfsym, bfd_und_section_ptr))
4523 /* Some standard ELF linkers do this, but we don't because it causes
4524 bootstrap comparison failures. */
4525 /* Output a file symbol for the output file as the second symbol.
4526 We output this even if we are discarding local symbols, although
4527 I'm not sure if this is correct. */
4528 elfsym.st_value = 0;
4530 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
4531 elfsym.st_other = 0;
4532 elfsym.st_shndx = SHN_ABS;
4533 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
4534 &elfsym, bfd_abs_section_ptr))
4538 /* Output a symbol for each section. We output these even if we are
4539 discarding local symbols, since they are used for relocs. These
4540 symbols have no names. We store the index of each one in the
4541 index field of the section, so that we can find it again when
4542 outputting relocs. */
4543 if (info->strip != strip_all || info->relocateable || info->emitrelocations)
4546 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
4547 elfsym.st_other = 0;
4548 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
4550 o = section_from_elf_index (abfd, i);
4552 o->target_index = bfd_get_symcount (abfd);
4553 elfsym.st_shndx = i;
4554 if (info->relocateable || o == NULL)
4555 elfsym.st_value = 0;
4557 elfsym.st_value = o->vma;
4558 if (! elf_link_output_sym (&finfo, (const char *) NULL,
4564 /* Allocate some memory to hold information read in from the input
4566 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
4567 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
4568 finfo.internal_relocs = ((Elf_Internal_Rela *)
4569 bfd_malloc (max_internal_reloc_count
4570 * sizeof (Elf_Internal_Rela)
4571 * bed->s->int_rels_per_ext_rel));
4572 finfo.external_syms = ((Elf_External_Sym *)
4573 bfd_malloc (max_sym_count
4574 * sizeof (Elf_External_Sym)));
4575 finfo.internal_syms = ((Elf_Internal_Sym *)
4576 bfd_malloc (max_sym_count
4577 * sizeof (Elf_Internal_Sym)));
4578 finfo.indices = (long *) bfd_malloc (max_sym_count * sizeof (long));
4579 finfo.sections = ((asection **)
4580 bfd_malloc (max_sym_count * sizeof (asection *)));
4581 if ((finfo.contents == NULL && max_contents_size != 0)
4582 || (finfo.external_relocs == NULL && max_external_reloc_size != 0)
4583 || (finfo.internal_relocs == NULL && max_internal_reloc_count != 0)
4584 || (finfo.external_syms == NULL && max_sym_count != 0)
4585 || (finfo.internal_syms == NULL && max_sym_count != 0)
4586 || (finfo.indices == NULL && max_sym_count != 0)
4587 || (finfo.sections == NULL && max_sym_count != 0))
4590 /* Since ELF permits relocations to be against local symbols, we
4591 must have the local symbols available when we do the relocations.
4592 Since we would rather only read the local symbols once, and we
4593 would rather not keep them in memory, we handle all the
4594 relocations for a single input file at the same time.
4596 Unfortunately, there is no way to know the total number of local
4597 symbols until we have seen all of them, and the local symbol
4598 indices precede the global symbol indices. This means that when
4599 we are generating relocateable output, and we see a reloc against
4600 a global symbol, we can not know the symbol index until we have
4601 finished examining all the local symbols to see which ones we are
4602 going to output. To deal with this, we keep the relocations in
4603 memory, and don't output them until the end of the link. This is
4604 an unfortunate waste of memory, but I don't see a good way around
4605 it. Fortunately, it only happens when performing a relocateable
4606 link, which is not the common case. FIXME: If keep_memory is set
4607 we could write the relocs out and then read them again; I don't
4608 know how bad the memory loss will be. */
4610 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
4611 sub->output_has_begun = false;
4612 for (o = abfd->sections; o != NULL; o = o->next)
4614 for (p = o->link_order_head; p != NULL; p = p->next)
4616 if (p->type == bfd_indirect_link_order
4617 && (bfd_get_flavour (p->u.indirect.section->owner)
4618 == bfd_target_elf_flavour))
4620 sub = p->u.indirect.section->owner;
4621 if (! sub->output_has_begun)
4623 if (! elf_link_input_bfd (&finfo, sub))
4625 sub->output_has_begun = true;
4628 else if (p->type == bfd_section_reloc_link_order
4629 || p->type == bfd_symbol_reloc_link_order)
4631 if (! elf_reloc_link_order (abfd, info, o, p))
4636 if (! _bfd_default_link_order (abfd, info, o, p))
4642 /* That wrote out all the local symbols. Finish up the symbol table
4643 with the global symbols. Even if we want to strip everything we
4644 can, we still need to deal with those global symbols that got
4645 converted to local in a version script. */
4649 /* Output any global symbols that got converted to local in a
4650 version script. We do this in a separate step since ELF
4651 requires all local symbols to appear prior to any global
4652 symbols. FIXME: We should only do this if some global
4653 symbols were, in fact, converted to become local. FIXME:
4654 Will this work correctly with the Irix 5 linker? */
4655 eoinfo.failed = false;
4656 eoinfo.finfo = &finfo;
4657 eoinfo.localsyms = true;
4658 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
4664 /* The sh_info field records the index of the first non local symbol. */
4665 symtab_hdr->sh_info = bfd_get_symcount (abfd);
4668 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
4670 Elf_Internal_Sym sym;
4671 Elf_External_Sym *dynsym =
4672 (Elf_External_Sym *)finfo.dynsym_sec->contents;
4673 long last_local = 0;
4675 /* Write out the section symbols for the output sections. */
4682 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
4685 for (s = abfd->sections; s != NULL; s = s->next)
4688 indx = elf_section_data (s)->this_idx;
4689 BFD_ASSERT (indx > 0);
4690 sym.st_shndx = indx;
4691 sym.st_value = s->vma;
4693 elf_swap_symbol_out (abfd, &sym,
4694 dynsym + elf_section_data (s)->dynindx);
4697 last_local = bfd_count_sections (abfd);
4700 /* Write out the local dynsyms. */
4701 if (elf_hash_table (info)->dynlocal)
4703 struct elf_link_local_dynamic_entry *e;
4704 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
4708 sym.st_size = e->isym.st_size;
4709 sym.st_other = e->isym.st_other;
4711 /* Copy the internal symbol as is.
4712 Note that we saved a word of storage and overwrote
4713 the original st_name with the dynstr_index. */
4716 if (e->isym.st_shndx > 0 && e->isym.st_shndx < SHN_LORESERVE)
4718 s = bfd_section_from_elf_index (e->input_bfd,
4722 elf_section_data (s->output_section)->this_idx;
4723 sym.st_value = (s->output_section->vma
4725 + e->isym.st_value);
4728 if (last_local < e->dynindx)
4729 last_local = e->dynindx;
4731 elf_swap_symbol_out (abfd, &sym, dynsym + e->dynindx);
4735 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
4739 /* We get the global symbols from the hash table. */
4740 eoinfo.failed = false;
4741 eoinfo.localsyms = false;
4742 eoinfo.finfo = &finfo;
4743 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
4748 /* If backend needs to output some symbols not present in the hash
4749 table, do it now. */
4750 if (bed->elf_backend_output_arch_syms)
4752 if (! (*bed->elf_backend_output_arch_syms)
4753 (abfd, info, (PTR) &finfo,
4754 (boolean (*) PARAMS ((PTR, const char *,
4755 Elf_Internal_Sym *, asection *)))
4756 elf_link_output_sym))
4760 /* Flush all symbols to the file. */
4761 if (! elf_link_flush_output_syms (&finfo))
4764 /* Now we know the size of the symtab section. */
4765 off += symtab_hdr->sh_size;
4767 /* Finish up and write out the symbol string table (.strtab)
4769 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
4770 /* sh_name was set in prep_headers. */
4771 symstrtab_hdr->sh_type = SHT_STRTAB;
4772 symstrtab_hdr->sh_flags = 0;
4773 symstrtab_hdr->sh_addr = 0;
4774 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
4775 symstrtab_hdr->sh_entsize = 0;
4776 symstrtab_hdr->sh_link = 0;
4777 symstrtab_hdr->sh_info = 0;
4778 /* sh_offset is set just below. */
4779 symstrtab_hdr->sh_addralign = 1;
4781 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
4782 elf_tdata (abfd)->next_file_pos = off;
4784 if (bfd_get_symcount (abfd) > 0)
4786 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
4787 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
4791 /* Adjust the relocs to have the correct symbol indices. */
4792 for (o = abfd->sections; o != NULL; o = o->next)
4794 if ((o->flags & SEC_RELOC) == 0)
4797 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
4798 elf_section_data (o)->rel_count,
4799 elf_section_data (o)->rel_hashes);
4800 if (elf_section_data (o)->rel_hdr2 != NULL)
4801 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
4802 elf_section_data (o)->rel_count2,
4803 (elf_section_data (o)->rel_hashes
4804 + elf_section_data (o)->rel_count));
4806 /* Set the reloc_count field to 0 to prevent write_relocs from
4807 trying to swap the relocs out itself. */
4811 /* If we are linking against a dynamic object, or generating a
4812 shared library, finish up the dynamic linking information. */
4815 Elf_External_Dyn *dyncon, *dynconend;
4817 /* Fix up .dynamic entries. */
4818 o = bfd_get_section_by_name (dynobj, ".dynamic");
4819 BFD_ASSERT (o != NULL);
4821 dyncon = (Elf_External_Dyn *) o->contents;
4822 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
4823 for (; dyncon < dynconend; dyncon++)
4825 Elf_Internal_Dyn dyn;
4829 elf_swap_dyn_in (dynobj, dyncon, &dyn);
4836 name = info->init_function;
4839 name = info->fini_function;
4842 struct elf_link_hash_entry *h;
4844 h = elf_link_hash_lookup (elf_hash_table (info), name,
4845 false, false, true);
4847 && (h->root.type == bfd_link_hash_defined
4848 || h->root.type == bfd_link_hash_defweak))
4850 dyn.d_un.d_val = h->root.u.def.value;
4851 o = h->root.u.def.section;
4852 if (o->output_section != NULL)
4853 dyn.d_un.d_val += (o->output_section->vma
4854 + o->output_offset);
4857 /* The symbol is imported from another shared
4858 library and does not apply to this one. */
4862 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4877 name = ".gnu.version_d";
4880 name = ".gnu.version_r";
4883 name = ".gnu.version";
4885 o = bfd_get_section_by_name (abfd, name);
4886 BFD_ASSERT (o != NULL);
4887 dyn.d_un.d_ptr = o->vma;
4888 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4895 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
4900 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
4902 Elf_Internal_Shdr *hdr;
4904 hdr = elf_elfsections (abfd)[i];
4905 if (hdr->sh_type == type
4906 && (hdr->sh_flags & SHF_ALLOC) != 0)
4908 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
4909 dyn.d_un.d_val += hdr->sh_size;
4912 if (dyn.d_un.d_val == 0
4913 || hdr->sh_addr < dyn.d_un.d_val)
4914 dyn.d_un.d_val = hdr->sh_addr;
4918 elf_swap_dyn_out (dynobj, &dyn, dyncon);
4924 /* If we have created any dynamic sections, then output them. */
4927 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
4930 for (o = dynobj->sections; o != NULL; o = o->next)
4932 if ((o->flags & SEC_HAS_CONTENTS) == 0
4933 || o->_raw_size == 0
4934 || o->output_section == bfd_abs_section_ptr)
4936 if ((o->flags & SEC_LINKER_CREATED) == 0)
4938 /* At this point, we are only interested in sections
4939 created by elf_link_create_dynamic_sections. */
4942 if ((elf_section_data (o->output_section)->this_hdr.sh_type
4944 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
4946 if (! bfd_set_section_contents (abfd, o->output_section,
4947 o->contents, o->output_offset,
4955 /* The contents of the .dynstr section are actually in a
4957 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
4958 if (bfd_seek (abfd, off, SEEK_SET) != 0
4959 || ! _bfd_stringtab_emit (abfd,
4960 elf_hash_table (info)->dynstr))
4966 /* If we have optimized stabs strings, output them. */
4967 if (elf_hash_table (info)->stab_info != NULL)
4969 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
4973 if (finfo.symstrtab != NULL)
4974 _bfd_stringtab_free (finfo.symstrtab);
4975 if (finfo.contents != NULL)
4976 free (finfo.contents);
4977 if (finfo.external_relocs != NULL)
4978 free (finfo.external_relocs);
4979 if (finfo.internal_relocs != NULL)
4980 free (finfo.internal_relocs);
4981 if (finfo.external_syms != NULL)
4982 free (finfo.external_syms);
4983 if (finfo.internal_syms != NULL)
4984 free (finfo.internal_syms);
4985 if (finfo.indices != NULL)
4986 free (finfo.indices);
4987 if (finfo.sections != NULL)
4988 free (finfo.sections);
4989 if (finfo.symbuf != NULL)
4990 free (finfo.symbuf);
4991 for (o = abfd->sections; o != NULL; o = o->next)
4993 if ((o->flags & SEC_RELOC) != 0
4994 && elf_section_data (o)->rel_hashes != NULL)
4995 free (elf_section_data (o)->rel_hashes);
4998 elf_tdata (abfd)->linker = true;
5003 if (finfo.symstrtab != NULL)
5004 _bfd_stringtab_free (finfo.symstrtab);
5005 if (finfo.contents != NULL)
5006 free (finfo.contents);
5007 if (finfo.external_relocs != NULL)
5008 free (finfo.external_relocs);
5009 if (finfo.internal_relocs != NULL)
5010 free (finfo.internal_relocs);
5011 if (finfo.external_syms != NULL)
5012 free (finfo.external_syms);
5013 if (finfo.internal_syms != NULL)
5014 free (finfo.internal_syms);
5015 if (finfo.indices != NULL)
5016 free (finfo.indices);
5017 if (finfo.sections != NULL)
5018 free (finfo.sections);
5019 if (finfo.symbuf != NULL)
5020 free (finfo.symbuf);
5021 for (o = abfd->sections; o != NULL; o = o->next)
5023 if ((o->flags & SEC_RELOC) != 0
5024 && elf_section_data (o)->rel_hashes != NULL)
5025 free (elf_section_data (o)->rel_hashes);
5031 /* Add a symbol to the output symbol table. */
5034 elf_link_output_sym (finfo, name, elfsym, input_sec)
5035 struct elf_final_link_info *finfo;
5037 Elf_Internal_Sym *elfsym;
5038 asection *input_sec;
5040 boolean (*output_symbol_hook) PARAMS ((bfd *,
5041 struct bfd_link_info *info,
5046 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
5047 elf_backend_link_output_symbol_hook;
5048 if (output_symbol_hook != NULL)
5050 if (! ((*output_symbol_hook)
5051 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
5055 if (name == (const char *) NULL || *name == '\0')
5056 elfsym->st_name = 0;
5057 else if (input_sec->flags & SEC_EXCLUDE)
5058 elfsym->st_name = 0;
5061 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
5064 if (elfsym->st_name == (unsigned long) -1)
5068 if (finfo->symbuf_count >= finfo->symbuf_size)
5070 if (! elf_link_flush_output_syms (finfo))
5074 elf_swap_symbol_out (finfo->output_bfd, elfsym,
5075 (PTR) (finfo->symbuf + finfo->symbuf_count));
5076 ++finfo->symbuf_count;
5078 ++ bfd_get_symcount (finfo->output_bfd);
5083 /* Flush the output symbols to the file. */
5086 elf_link_flush_output_syms (finfo)
5087 struct elf_final_link_info *finfo;
5089 if (finfo->symbuf_count > 0)
5091 Elf_Internal_Shdr *symtab;
5093 symtab = &elf_tdata (finfo->output_bfd)->symtab_hdr;
5095 if (bfd_seek (finfo->output_bfd, symtab->sh_offset + symtab->sh_size,
5097 || (bfd_write ((PTR) finfo->symbuf, finfo->symbuf_count,
5098 sizeof (Elf_External_Sym), finfo->output_bfd)
5099 != finfo->symbuf_count * sizeof (Elf_External_Sym)))
5102 symtab->sh_size += finfo->symbuf_count * sizeof (Elf_External_Sym);
5104 finfo->symbuf_count = 0;
5110 /* Adjust all external symbols pointing into SEC_MERGE sections
5111 to reflect the object merging within the sections. */
5114 elf_link_sec_merge_syms (h, data)
5115 struct elf_link_hash_entry *h;
5120 if ((h->root.type == bfd_link_hash_defined
5121 || h->root.type == bfd_link_hash_defweak)
5122 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
5123 && elf_section_data (sec)->merge_info)
5125 bfd *output_bfd = (bfd *) data;
5127 h->root.u.def.value =
5128 _bfd_merged_section_offset (output_bfd,
5129 &h->root.u.def.section,
5130 elf_section_data (sec)->merge_info,
5131 h->root.u.def.value, (bfd_vma) 0);
5137 /* Add an external symbol to the symbol table. This is called from
5138 the hash table traversal routine. When generating a shared object,
5139 we go through the symbol table twice. The first time we output
5140 anything that might have been forced to local scope in a version
5141 script. The second time we output the symbols that are still
5145 elf_link_output_extsym (h, data)
5146 struct elf_link_hash_entry *h;
5149 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
5150 struct elf_final_link_info *finfo = eoinfo->finfo;
5152 Elf_Internal_Sym sym;
5153 asection *input_sec;
5155 /* Decide whether to output this symbol in this pass. */
5156 if (eoinfo->localsyms)
5158 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5163 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5167 /* If we are not creating a shared library, and this symbol is
5168 referenced by a shared library but is not defined anywhere, then
5169 warn that it is undefined. If we do not do this, the runtime
5170 linker will complain that the symbol is undefined when the
5171 program is run. We don't have to worry about symbols that are
5172 referenced by regular files, because we will already have issued
5173 warnings for them. */
5174 if (! finfo->info->relocateable
5175 && ! finfo->info->allow_shlib_undefined
5176 && ! (finfo->info->shared
5177 && !finfo->info->no_undefined)
5178 && h->root.type == bfd_link_hash_undefined
5179 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
5180 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
5182 if (! ((*finfo->info->callbacks->undefined_symbol)
5183 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
5184 (asection *) NULL, 0, true)))
5186 eoinfo->failed = true;
5191 /* We don't want to output symbols that have never been mentioned by
5192 a regular file, or that we have been told to strip. However, if
5193 h->indx is set to -2, the symbol is used by a reloc and we must
5197 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
5198 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
5199 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
5200 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
5202 else if (finfo->info->strip == strip_all
5203 || (finfo->info->strip == strip_some
5204 && bfd_hash_lookup (finfo->info->keep_hash,
5205 h->root.root.string,
5206 false, false) == NULL))
5211 /* If we're stripping it, and it's not a dynamic symbol, there's
5212 nothing else to do unless it is a forced local symbol. */
5215 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5219 sym.st_size = h->size;
5220 sym.st_other = h->other;
5221 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5222 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
5223 else if (h->root.type == bfd_link_hash_undefweak
5224 || h->root.type == bfd_link_hash_defweak)
5225 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
5227 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
5229 switch (h->root.type)
5232 case bfd_link_hash_new:
5236 case bfd_link_hash_undefined:
5237 input_sec = bfd_und_section_ptr;
5238 sym.st_shndx = SHN_UNDEF;
5241 case bfd_link_hash_undefweak:
5242 input_sec = bfd_und_section_ptr;
5243 sym.st_shndx = SHN_UNDEF;
5246 case bfd_link_hash_defined:
5247 case bfd_link_hash_defweak:
5249 input_sec = h->root.u.def.section;
5250 if (input_sec->output_section != NULL)
5253 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
5254 input_sec->output_section);
5255 if (sym.st_shndx == (unsigned short) -1)
5257 (*_bfd_error_handler)
5258 (_("%s: could not find output section %s for input section %s"),
5259 bfd_get_filename (finfo->output_bfd),
5260 input_sec->output_section->name,
5262 eoinfo->failed = true;
5266 /* ELF symbols in relocateable files are section relative,
5267 but in nonrelocateable files they are virtual
5269 sym.st_value = h->root.u.def.value + input_sec->output_offset;
5270 if (! finfo->info->relocateable)
5271 sym.st_value += input_sec->output_section->vma;
5275 BFD_ASSERT (input_sec->owner == NULL
5276 || (input_sec->owner->flags & DYNAMIC) != 0);
5277 sym.st_shndx = SHN_UNDEF;
5278 input_sec = bfd_und_section_ptr;
5283 case bfd_link_hash_common:
5284 input_sec = h->root.u.c.p->section;
5285 sym.st_shndx = SHN_COMMON;
5286 sym.st_value = 1 << h->root.u.c.p->alignment_power;
5289 case bfd_link_hash_indirect:
5290 /* These symbols are created by symbol versioning. They point
5291 to the decorated version of the name. For example, if the
5292 symbol foo@@GNU_1.2 is the default, which should be used when
5293 foo is used with no version, then we add an indirect symbol
5294 foo which points to foo@@GNU_1.2. We ignore these symbols,
5295 since the indirected symbol is already in the hash table. */
5298 case bfd_link_hash_warning:
5299 /* We can't represent these symbols in ELF, although a warning
5300 symbol may have come from a .gnu.warning.SYMBOL section. We
5301 just put the target symbol in the hash table. If the target
5302 symbol does not really exist, don't do anything. */
5303 if (h->root.u.i.link->type == bfd_link_hash_new)
5305 return (elf_link_output_extsym
5306 ((struct elf_link_hash_entry *) h->root.u.i.link, data));
5309 /* Give the processor backend a chance to tweak the symbol value,
5310 and also to finish up anything that needs to be done for this
5312 if ((h->dynindx != -1
5313 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5314 && elf_hash_table (finfo->info)->dynamic_sections_created)
5316 struct elf_backend_data *bed;
5318 bed = get_elf_backend_data (finfo->output_bfd);
5319 if (! ((*bed->elf_backend_finish_dynamic_symbol)
5320 (finfo->output_bfd, finfo->info, h, &sym)))
5322 eoinfo->failed = true;
5327 /* If we are marking the symbol as undefined, and there are no
5328 non-weak references to this symbol from a regular object, then
5329 mark the symbol as weak undefined; if there are non-weak
5330 references, mark the symbol as strong. We can't do this earlier,
5331 because it might not be marked as undefined until the
5332 finish_dynamic_symbol routine gets through with it. */
5333 if (sym.st_shndx == SHN_UNDEF
5334 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
5335 && (ELF_ST_BIND(sym.st_info) == STB_GLOBAL
5336 || ELF_ST_BIND(sym.st_info) == STB_WEAK))
5340 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
5341 bindtype = STB_GLOBAL;
5343 bindtype = STB_WEAK;
5344 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
5347 /* If a symbol is not defined locally, we clear the visibility
5349 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
5350 sym.st_other ^= ELF_ST_VISIBILITY(sym.st_other);
5352 /* If this symbol should be put in the .dynsym section, then put it
5353 there now. We have already know the symbol index. We also fill
5354 in the entry in the .hash section. */
5355 if (h->dynindx != -1
5356 && elf_hash_table (finfo->info)->dynamic_sections_created)
5360 size_t hash_entry_size;
5361 bfd_byte *bucketpos;
5364 sym.st_name = h->dynstr_index;
5366 elf_swap_symbol_out (finfo->output_bfd, &sym,
5367 (PTR) (((Elf_External_Sym *)
5368 finfo->dynsym_sec->contents)
5371 bucketcount = elf_hash_table (finfo->info)->bucketcount;
5372 bucket = h->elf_hash_value % bucketcount;
5374 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
5375 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
5376 + (bucket + 2) * hash_entry_size);
5377 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
5378 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
5379 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
5380 ((bfd_byte *) finfo->hash_sec->contents
5381 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
5383 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
5385 Elf_Internal_Versym iversym;
5387 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
5389 if (h->verinfo.verdef == NULL)
5390 iversym.vs_vers = 0;
5392 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
5396 if (h->verinfo.vertree == NULL)
5397 iversym.vs_vers = 1;
5399 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
5402 if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
5403 iversym.vs_vers |= VERSYM_HIDDEN;
5405 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym,
5406 (((Elf_External_Versym *)
5407 finfo->symver_sec->contents)
5412 /* If we're stripping it, then it was just a dynamic symbol, and
5413 there's nothing else to do. */
5417 h->indx = bfd_get_symcount (finfo->output_bfd);
5419 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
5421 eoinfo->failed = true;
5428 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5429 originated from the section given by INPUT_REL_HDR) to the
5433 elf_link_output_relocs (output_bfd, input_section, input_rel_hdr,
5436 asection *input_section;
5437 Elf_Internal_Shdr *input_rel_hdr;
5438 Elf_Internal_Rela *internal_relocs;
5440 Elf_Internal_Rela *irela;
5441 Elf_Internal_Rela *irelaend;
5442 Elf_Internal_Shdr *output_rel_hdr;
5443 asection *output_section;
5444 unsigned int *rel_countp = NULL;
5445 struct elf_backend_data *bed;
5447 output_section = input_section->output_section;
5448 output_rel_hdr = NULL;
5450 if (elf_section_data (output_section)->rel_hdr.sh_entsize
5451 == input_rel_hdr->sh_entsize)
5453 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
5454 rel_countp = &elf_section_data (output_section)->rel_count;
5456 else if (elf_section_data (output_section)->rel_hdr2
5457 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
5458 == input_rel_hdr->sh_entsize))
5460 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
5461 rel_countp = &elf_section_data (output_section)->rel_count2;
5464 BFD_ASSERT (output_rel_hdr != NULL);
5466 bed = get_elf_backend_data (output_bfd);
5467 irela = internal_relocs;
5468 irelaend = irela + NUM_SHDR_ENTRIES (input_rel_hdr)
5469 * bed->s->int_rels_per_ext_rel;
5471 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
5473 Elf_External_Rel *erel;
5474 Elf_Internal_Rel *irel;
5476 irel = (Elf_Internal_Rel *) bfd_zmalloc (bed->s->int_rels_per_ext_rel
5477 * sizeof (Elf_Internal_Rel));
5480 (*_bfd_error_handler) (_("Error: out of memory"));
5484 erel = ((Elf_External_Rel *) output_rel_hdr->contents + *rel_countp);
5485 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erel++)
5489 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
5491 irel[i].r_offset = irela[i].r_offset;
5492 irel[i].r_info = irela[i].r_info;
5493 BFD_ASSERT (irela[i].r_addend == 0);
5496 if (bed->s->swap_reloc_out)
5497 (*bed->s->swap_reloc_out) (output_bfd, irel, (PTR) erel);
5499 elf_swap_reloc_out (output_bfd, irel, erel);
5506 Elf_External_Rela *erela;
5508 BFD_ASSERT (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rela));
5510 erela = ((Elf_External_Rela *) output_rel_hdr->contents + *rel_countp);
5511 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erela++)
5512 if (bed->s->swap_reloca_out)
5513 (*bed->s->swap_reloca_out) (output_bfd, irela, (PTR) erela);
5515 elf_swap_reloca_out (output_bfd, irela, erela);
5518 /* Bump the counter, so that we know where to add the next set of
5520 *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr);
5523 /* Link an input file into the linker output file. This function
5524 handles all the sections and relocations of the input file at once.
5525 This is so that we only have to read the local symbols once, and
5526 don't have to keep them in memory. */
5529 elf_link_input_bfd (finfo, input_bfd)
5530 struct elf_final_link_info *finfo;
5533 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
5534 bfd *, asection *, bfd_byte *,
5535 Elf_Internal_Rela *,
5536 Elf_Internal_Sym *, asection **));
5538 Elf_Internal_Shdr *symtab_hdr;
5541 Elf_External_Sym *external_syms;
5542 Elf_External_Sym *esym;
5543 Elf_External_Sym *esymend;
5544 Elf_Internal_Sym *isym;
5546 asection **ppsection;
5548 struct elf_backend_data *bed;
5550 output_bfd = finfo->output_bfd;
5551 bed = get_elf_backend_data (output_bfd);
5552 relocate_section = bed->elf_backend_relocate_section;
5554 /* If this is a dynamic object, we don't want to do anything here:
5555 we don't want the local symbols, and we don't want the section
5557 if ((input_bfd->flags & DYNAMIC) != 0)
5560 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
5561 if (elf_bad_symtab (input_bfd))
5563 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
5568 locsymcount = symtab_hdr->sh_info;
5569 extsymoff = symtab_hdr->sh_info;
5572 /* Read the local symbols. */
5573 if (symtab_hdr->contents != NULL)
5574 external_syms = (Elf_External_Sym *) symtab_hdr->contents;
5575 else if (locsymcount == 0)
5576 external_syms = NULL;
5579 external_syms = finfo->external_syms;
5580 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
5581 || (bfd_read (external_syms, sizeof (Elf_External_Sym),
5582 locsymcount, input_bfd)
5583 != locsymcount * sizeof (Elf_External_Sym)))
5587 /* Swap in the local symbols and write out the ones which we know
5588 are going into the output file. */
5589 esym = external_syms;
5590 esymend = esym + locsymcount;
5591 isym = finfo->internal_syms;
5592 pindex = finfo->indices;
5593 ppsection = finfo->sections;
5594 for (; esym < esymend; esym++, isym++, pindex++, ppsection++)
5598 Elf_Internal_Sym osym;
5600 elf_swap_symbol_in (input_bfd, esym, isym);
5603 if (elf_bad_symtab (input_bfd))
5605 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
5613 if (isym->st_shndx == SHN_UNDEF)
5615 isec = bfd_und_section_ptr;
5618 else if (isym->st_shndx > 0 && isym->st_shndx < SHN_LORESERVE)
5620 isec = section_from_elf_index (input_bfd, isym->st_shndx);
5621 if (isec && elf_section_data (isec)->merge_info
5622 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
5624 _bfd_merged_section_offset (output_bfd, &isec,
5625 elf_section_data (isec)->merge_info,
5626 isym->st_value, (bfd_vma) 0);
5628 else if (isym->st_shndx == SHN_ABS)
5630 isec = bfd_abs_section_ptr;
5633 else if (isym->st_shndx == SHN_COMMON)
5635 isec = bfd_com_section_ptr;
5646 /* Don't output the first, undefined, symbol. */
5647 if (esym == external_syms)
5650 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
5654 /* Save away all section symbol values. */
5659 if (isec->symbol->value != isym->st_value)
5660 (*_bfd_error_handler)
5661 (_("%s: invalid section symbol index 0x%x (%s) ingored"),
5662 bfd_get_filename (input_bfd), isym->st_shndx,
5666 isec->symbol->value = isym->st_value;
5669 /* If this is a discarded link-once section symbol, update
5670 it's value to that of the kept section symbol. The
5671 linker will keep the first of any matching link-once
5672 sections, so we should have already seen it's section
5673 symbol. I trust no-one will have the bright idea of
5674 re-ordering the bfd list... */
5676 && (bfd_get_section_flags (input_bfd, isec) & SEC_LINK_ONCE) != 0
5677 && (ksec = isec->kept_section) != NULL)
5679 isym->st_value = ksec->symbol->value;
5681 /* That put the value right, but the section info is all
5682 wrong. I hope this works. */
5683 isec->output_offset = ksec->output_offset;
5684 isec->output_section = ksec->output_section;
5687 /* We never output section symbols. Instead, we use the
5688 section symbol of the corresponding section in the output
5693 /* If we are stripping all symbols, we don't want to output this
5695 if (finfo->info->strip == strip_all)
5698 /* If we are discarding all local symbols, we don't want to
5699 output this one. If we are generating a relocateable output
5700 file, then some of the local symbols may be required by
5701 relocs; we output them below as we discover that they are
5703 if (finfo->info->discard == discard_all)
5706 /* If this symbol is defined in a section which we are
5707 discarding, we don't need to keep it, but note that
5708 linker_mark is only reliable for sections that have contents.
5709 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5710 as well as linker_mark. */
5711 if (isym->st_shndx > 0
5712 && isym->st_shndx < SHN_LORESERVE
5714 && ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
5715 || (! finfo->info->relocateable
5716 && (isec->flags & SEC_EXCLUDE) != 0)))
5719 /* Get the name of the symbol. */
5720 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
5725 /* See if we are discarding symbols with this name. */
5726 if ((finfo->info->strip == strip_some
5727 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
5729 || (((finfo->info->discard == discard_sec_merge
5730 && (isec->flags & SEC_MERGE) && ! finfo->info->relocateable)
5731 || finfo->info->discard == discard_l)
5732 && bfd_is_local_label_name (input_bfd, name)))
5735 /* If we get here, we are going to output this symbol. */
5739 /* Adjust the section index for the output file. */
5740 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
5741 isec->output_section);
5742 if (osym.st_shndx == (unsigned short) -1)
5745 *pindex = bfd_get_symcount (output_bfd);
5747 /* ELF symbols in relocateable files are section relative, but
5748 in executable files they are virtual addresses. Note that
5749 this code assumes that all ELF sections have an associated
5750 BFD section with a reasonable value for output_offset; below
5751 we assume that they also have a reasonable value for
5752 output_section. Any special sections must be set up to meet
5753 these requirements. */
5754 osym.st_value += isec->output_offset;
5755 if (! finfo->info->relocateable)
5756 osym.st_value += isec->output_section->vma;
5758 if (! elf_link_output_sym (finfo, name, &osym, isec))
5762 /* Relocate the contents of each section. */
5763 for (o = input_bfd->sections; o != NULL; o = o->next)
5767 if (! o->linker_mark)
5769 /* This section was omitted from the link. */
5773 if ((o->flags & SEC_HAS_CONTENTS) == 0
5774 || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
5777 if ((o->flags & SEC_LINKER_CREATED) != 0)
5779 /* Section was created by elf_link_create_dynamic_sections
5784 /* Get the contents of the section. They have been cached by a
5785 relaxation routine. Note that o is a section in an input
5786 file, so the contents field will not have been set by any of
5787 the routines which work on output files. */
5788 if (elf_section_data (o)->this_hdr.contents != NULL)
5789 contents = elf_section_data (o)->this_hdr.contents;
5792 contents = finfo->contents;
5793 if (! bfd_get_section_contents (input_bfd, o, contents,
5794 (file_ptr) 0, o->_raw_size))
5798 if ((o->flags & SEC_RELOC) != 0)
5800 Elf_Internal_Rela *internal_relocs;
5802 /* Get the swapped relocs. */
5803 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
5804 (input_bfd, o, finfo->external_relocs,
5805 finfo->internal_relocs, false));
5806 if (internal_relocs == NULL
5807 && o->reloc_count > 0)
5810 /* Relocate the section by invoking a back end routine.
5812 The back end routine is responsible for adjusting the
5813 section contents as necessary, and (if using Rela relocs
5814 and generating a relocateable output file) adjusting the
5815 reloc addend as necessary.
5817 The back end routine does not have to worry about setting
5818 the reloc address or the reloc symbol index.
5820 The back end routine is given a pointer to the swapped in
5821 internal symbols, and can access the hash table entries
5822 for the external symbols via elf_sym_hashes (input_bfd).
5824 When generating relocateable output, the back end routine
5825 must handle STB_LOCAL/STT_SECTION symbols specially. The
5826 output symbol is going to be a section symbol
5827 corresponding to the output section, which will require
5828 the addend to be adjusted. */
5830 if (! (*relocate_section) (output_bfd, finfo->info,
5831 input_bfd, o, contents,
5833 finfo->internal_syms,
5837 if (finfo->info->relocateable || finfo->info->emitrelocations)
5839 Elf_Internal_Rela *irela;
5840 Elf_Internal_Rela *irelaend;
5841 struct elf_link_hash_entry **rel_hash;
5842 Elf_Internal_Shdr *input_rel_hdr;
5843 unsigned char next_erel;
5845 /* Adjust the reloc addresses and symbol indices. */
5847 irela = internal_relocs;
5849 + o->reloc_count * bed->s->int_rels_per_ext_rel;
5850 rel_hash = (elf_section_data (o->output_section)->rel_hashes
5851 + elf_section_data (o->output_section)->rel_count
5852 + elf_section_data (o->output_section)->rel_count2);
5853 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
5855 unsigned long r_symndx;
5856 Elf_Internal_Sym *isym;
5859 if (next_erel == bed->s->int_rels_per_ext_rel)
5865 irela->r_offset += o->output_offset;
5867 /* Relocs in an executable have to be virtual addresses. */
5868 if (finfo->info->emitrelocations)
5869 irela->r_offset += o->output_section->vma;
5871 r_symndx = ELF_R_SYM (irela->r_info);
5876 if (r_symndx >= locsymcount
5877 || (elf_bad_symtab (input_bfd)
5878 && finfo->sections[r_symndx] == NULL))
5880 struct elf_link_hash_entry *rh;
5883 /* This is a reloc against a global symbol. We
5884 have not yet output all the local symbols, so
5885 we do not know the symbol index of any global
5886 symbol. We set the rel_hash entry for this
5887 reloc to point to the global hash table entry
5888 for this symbol. The symbol index is then
5889 set at the end of elf_bfd_final_link. */
5890 indx = r_symndx - extsymoff;
5891 rh = elf_sym_hashes (input_bfd)[indx];
5892 while (rh->root.type == bfd_link_hash_indirect
5893 || rh->root.type == bfd_link_hash_warning)
5894 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
5896 /* Setting the index to -2 tells
5897 elf_link_output_extsym that this symbol is
5899 BFD_ASSERT (rh->indx < 0);
5907 /* This is a reloc against a local symbol. */
5910 isym = finfo->internal_syms + r_symndx;
5911 sec = finfo->sections[r_symndx];
5912 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
5914 /* I suppose the backend ought to fill in the
5915 section of any STT_SECTION symbol against a
5916 processor specific section. If we have
5917 discarded a section, the output_section will
5918 be the absolute section. */
5920 && (bfd_is_abs_section (sec)
5921 || (sec->output_section != NULL
5922 && bfd_is_abs_section (sec->output_section))))
5924 else if (sec == NULL || sec->owner == NULL)
5926 bfd_set_error (bfd_error_bad_value);
5931 r_symndx = sec->output_section->target_index;
5932 BFD_ASSERT (r_symndx != 0);
5937 if (finfo->indices[r_symndx] == -1)
5943 if (finfo->info->strip == strip_all)
5945 /* You can't do ld -r -s. */
5946 bfd_set_error (bfd_error_invalid_operation);
5950 /* This symbol was skipped earlier, but
5951 since it is needed by a reloc, we
5952 must output it now. */
5953 link = symtab_hdr->sh_link;
5954 name = bfd_elf_string_from_elf_section (input_bfd,
5960 osec = sec->output_section;
5962 _bfd_elf_section_from_bfd_section (output_bfd,
5964 if (isym->st_shndx == (unsigned short) -1)
5967 isym->st_value += sec->output_offset;
5968 if (! finfo->info->relocateable)
5969 isym->st_value += osec->vma;
5971 finfo->indices[r_symndx] = bfd_get_symcount (output_bfd);
5973 if (! elf_link_output_sym (finfo, name, isym, sec))
5977 r_symndx = finfo->indices[r_symndx];
5980 irela->r_info = ELF_R_INFO (r_symndx,
5981 ELF_R_TYPE (irela->r_info));
5984 /* Swap out the relocs. */
5985 input_rel_hdr = &elf_section_data (o)->rel_hdr;
5986 elf_link_output_relocs (output_bfd, o,
5989 internal_relocs += NUM_SHDR_ENTRIES (input_rel_hdr)
5990 * bed->s->int_rels_per_ext_rel;
5991 input_rel_hdr = elf_section_data (o)->rel_hdr2;
5993 elf_link_output_relocs (output_bfd, o,
5999 /* Write out the modified section contents. */
6000 if (elf_section_data (o)->stab_info)
6002 if (! (_bfd_write_section_stabs
6003 (output_bfd, &elf_hash_table (finfo->info)->stab_info,
6004 o, &elf_section_data (o)->stab_info, contents)))
6007 else if (elf_section_data (o)->merge_info)
6009 if (! (_bfd_write_merged_section
6010 (output_bfd, o, elf_section_data (o)->merge_info)))
6015 if (! (o->flags & SEC_EXCLUDE) &&
6016 ! bfd_set_section_contents (output_bfd, o->output_section,
6017 contents, o->output_offset,
6018 (o->_cooked_size != 0
6028 /* Generate a reloc when linking an ELF file. This is a reloc
6029 requested by the linker, and does come from any input file. This
6030 is used to build constructor and destructor tables when linking
6034 elf_reloc_link_order (output_bfd, info, output_section, link_order)
6036 struct bfd_link_info *info;
6037 asection *output_section;
6038 struct bfd_link_order *link_order;
6040 reloc_howto_type *howto;
6044 struct elf_link_hash_entry **rel_hash_ptr;
6045 Elf_Internal_Shdr *rel_hdr;
6046 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
6048 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
6051 bfd_set_error (bfd_error_bad_value);
6055 addend = link_order->u.reloc.p->addend;
6057 /* Figure out the symbol index. */
6058 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
6059 + elf_section_data (output_section)->rel_count
6060 + elf_section_data (output_section)->rel_count2);
6061 if (link_order->type == bfd_section_reloc_link_order)
6063 indx = link_order->u.reloc.p->u.section->target_index;
6064 BFD_ASSERT (indx != 0);
6065 *rel_hash_ptr = NULL;
6069 struct elf_link_hash_entry *h;
6071 /* Treat a reloc against a defined symbol as though it were
6072 actually against the section. */
6073 h = ((struct elf_link_hash_entry *)
6074 bfd_wrapped_link_hash_lookup (output_bfd, info,
6075 link_order->u.reloc.p->u.name,
6076 false, false, true));
6078 && (h->root.type == bfd_link_hash_defined
6079 || h->root.type == bfd_link_hash_defweak))
6083 section = h->root.u.def.section;
6084 indx = section->output_section->target_index;
6085 *rel_hash_ptr = NULL;
6086 /* It seems that we ought to add the symbol value to the
6087 addend here, but in practice it has already been added
6088 because it was passed to constructor_callback. */
6089 addend += section->output_section->vma + section->output_offset;
6093 /* Setting the index to -2 tells elf_link_output_extsym that
6094 this symbol is used by a reloc. */
6101 if (! ((*info->callbacks->unattached_reloc)
6102 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
6103 (asection *) NULL, (bfd_vma) 0)))
6109 /* If this is an inplace reloc, we must write the addend into the
6111 if (howto->partial_inplace && addend != 0)
6114 bfd_reloc_status_type rstat;
6118 size = bfd_get_reloc_size (howto);
6119 buf = (bfd_byte *) bfd_zmalloc (size);
6120 if (buf == (bfd_byte *) NULL)
6122 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
6128 case bfd_reloc_outofrange:
6130 case bfd_reloc_overflow:
6131 if (! ((*info->callbacks->reloc_overflow)
6133 (link_order->type == bfd_section_reloc_link_order
6134 ? bfd_section_name (output_bfd,
6135 link_order->u.reloc.p->u.section)
6136 : link_order->u.reloc.p->u.name),
6137 howto->name, addend, (bfd *) NULL, (asection *) NULL,
6145 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
6146 (file_ptr) link_order->offset, size);
6152 /* The address of a reloc is relative to the section in a
6153 relocateable file, and is a virtual address in an executable
6155 offset = link_order->offset;
6156 if (! info->relocateable)
6157 offset += output_section->vma;
6159 rel_hdr = &elf_section_data (output_section)->rel_hdr;
6161 if (rel_hdr->sh_type == SHT_REL)
6163 Elf_Internal_Rel *irel;
6164 Elf_External_Rel *erel;
6167 irel = (Elf_Internal_Rel *) bfd_zmalloc (bed->s->int_rels_per_ext_rel
6168 * sizeof (Elf_Internal_Rel));
6172 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
6173 irel[i].r_offset = offset;
6174 irel[0].r_info = ELF_R_INFO (indx, howto->type);
6176 erel = ((Elf_External_Rel *) rel_hdr->contents
6177 + elf_section_data (output_section)->rel_count);
6179 if (bed->s->swap_reloc_out)
6180 (*bed->s->swap_reloc_out) (output_bfd, irel, (bfd_byte *) erel);
6182 elf_swap_reloc_out (output_bfd, irel, erel);
6188 Elf_Internal_Rela *irela;
6189 Elf_External_Rela *erela;
6192 irela = (Elf_Internal_Rela *) bfd_zmalloc (bed->s->int_rels_per_ext_rel
6193 * sizeof (Elf_Internal_Rela));
6197 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
6198 irela[i].r_offset = offset;
6199 irela[0].r_info = ELF_R_INFO (indx, howto->type);
6200 irela[0].r_addend = addend;
6202 erela = ((Elf_External_Rela *) rel_hdr->contents
6203 + elf_section_data (output_section)->rel_count);
6205 if (bed->s->swap_reloca_out)
6206 (*bed->s->swap_reloca_out) (output_bfd, irela, (bfd_byte *) erela);
6208 elf_swap_reloca_out (output_bfd, irela, erela);
6211 ++elf_section_data (output_section)->rel_count;
6216 /* Allocate a pointer to live in a linker created section. */
6219 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
6221 struct bfd_link_info *info;
6222 elf_linker_section_t *lsect;
6223 struct elf_link_hash_entry *h;
6224 const Elf_Internal_Rela *rel;
6226 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
6227 elf_linker_section_pointers_t *linker_section_ptr;
6228 unsigned long r_symndx = ELF_R_SYM (rel->r_info);;
6230 BFD_ASSERT (lsect != NULL);
6232 /* Is this a global symbol? */
6235 /* Has this symbol already been allocated, if so, our work is done */
6236 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
6241 ptr_linker_section_ptr = &h->linker_section_pointer;
6242 /* Make sure this symbol is output as a dynamic symbol. */
6243 if (h->dynindx == -1)
6245 if (! elf_link_record_dynamic_symbol (info, h))
6249 if (lsect->rel_section)
6250 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
6253 else /* Allocation of a pointer to a local symbol */
6255 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
6257 /* Allocate a table to hold the local symbols if first time */
6260 unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
6261 register unsigned int i;
6263 ptr = (elf_linker_section_pointers_t **)
6264 bfd_alloc (abfd, num_symbols * sizeof (elf_linker_section_pointers_t *));
6269 elf_local_ptr_offsets (abfd) = ptr;
6270 for (i = 0; i < num_symbols; i++)
6271 ptr[i] = (elf_linker_section_pointers_t *)0;
6274 /* Has this symbol already been allocated, if so, our work is done */
6275 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
6280 ptr_linker_section_ptr = &ptr[r_symndx];
6284 /* If we are generating a shared object, we need to
6285 output a R_<xxx>_RELATIVE reloc so that the
6286 dynamic linker can adjust this GOT entry. */
6287 BFD_ASSERT (lsect->rel_section != NULL);
6288 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
6292 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
6293 from internal memory. */
6294 BFD_ASSERT (ptr_linker_section_ptr != NULL);
6295 linker_section_ptr = (elf_linker_section_pointers_t *)
6296 bfd_alloc (abfd, sizeof (elf_linker_section_pointers_t));
6298 if (!linker_section_ptr)
6301 linker_section_ptr->next = *ptr_linker_section_ptr;
6302 linker_section_ptr->addend = rel->r_addend;
6303 linker_section_ptr->which = lsect->which;
6304 linker_section_ptr->written_address_p = false;
6305 *ptr_linker_section_ptr = linker_section_ptr;
6308 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
6310 linker_section_ptr->offset = lsect->section->_raw_size - lsect->hole_size + (ARCH_SIZE / 8);
6311 lsect->hole_offset += ARCH_SIZE / 8;
6312 lsect->sym_offset += ARCH_SIZE / 8;
6313 if (lsect->sym_hash) /* Bump up symbol value if needed */
6315 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
6317 fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
6318 lsect->sym_hash->root.root.string,
6319 (long)ARCH_SIZE / 8,
6320 (long)lsect->sym_hash->root.u.def.value);
6326 linker_section_ptr->offset = lsect->section->_raw_size;
6328 lsect->section->_raw_size += ARCH_SIZE / 8;
6331 fprintf (stderr, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
6332 lsect->name, (long)linker_section_ptr->offset, (long)lsect->section->_raw_size);
6339 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
6342 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
6345 /* Fill in the address for a pointer generated in a linker section. */
6348 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h, relocation, rel, relative_reloc)
6351 struct bfd_link_info *info;
6352 elf_linker_section_t *lsect;
6353 struct elf_link_hash_entry *h;
6355 const Elf_Internal_Rela *rel;
6358 elf_linker_section_pointers_t *linker_section_ptr;
6360 BFD_ASSERT (lsect != NULL);
6362 if (h != NULL) /* global symbol */
6364 linker_section_ptr = _bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
6368 BFD_ASSERT (linker_section_ptr != NULL);
6370 if (! elf_hash_table (info)->dynamic_sections_created
6373 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
6375 /* This is actually a static link, or it is a
6376 -Bsymbolic link and the symbol is defined
6377 locally. We must initialize this entry in the
6380 When doing a dynamic link, we create a .rela.<xxx>
6381 relocation entry to initialize the value. This
6382 is done in the finish_dynamic_symbol routine. */
6383 if (!linker_section_ptr->written_address_p)
6385 linker_section_ptr->written_address_p = true;
6386 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
6387 lsect->section->contents + linker_section_ptr->offset);
6391 else /* local symbol */
6393 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
6394 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
6395 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
6396 linker_section_ptr = _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd)[r_symndx],
6400 BFD_ASSERT (linker_section_ptr != NULL);
6402 /* Write out pointer if it hasn't been rewritten out before */
6403 if (!linker_section_ptr->written_address_p)
6405 linker_section_ptr->written_address_p = true;
6406 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
6407 lsect->section->contents + linker_section_ptr->offset);
6411 asection *srel = lsect->rel_section;
6412 Elf_Internal_Rela *outrel;
6413 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
6416 outrel = (Elf_Internal_Rela *) bfd_zmalloc (sizeof (Elf_Internal_Rela)
6417 * bed->s->int_rels_per_ext_rel);
6420 (*_bfd_error_handler) (_("Error: out of memory"));
6424 /* We need to generate a relative reloc for the dynamic linker. */
6426 lsect->rel_section = srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
6429 BFD_ASSERT (srel != NULL);
6431 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
6432 outrel[i].r_offset = (lsect->section->output_section->vma
6433 + lsect->section->output_offset
6434 + linker_section_ptr->offset);
6435 outrel[0].r_info = ELF_R_INFO (0, relative_reloc);
6436 outrel[0].r_addend = 0;
6437 elf_swap_reloca_out (output_bfd, outrel,
6438 (((Elf_External_Rela *)
6439 lsect->section->contents)
6440 + elf_section_data (lsect->section)->rel_count));
6441 ++elf_section_data (lsect->section)->rel_count;
6448 relocation = (lsect->section->output_offset
6449 + linker_section_ptr->offset
6450 - lsect->hole_offset
6451 - lsect->sym_offset);
6454 fprintf (stderr, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
6455 lsect->name, (long)relocation, (long)relocation);
6458 /* Subtract out the addend, because it will get added back in by the normal
6460 return relocation - linker_section_ptr->addend;
6463 /* Garbage collect unused sections. */
6465 static boolean elf_gc_mark
6466 PARAMS ((struct bfd_link_info *info, asection *sec,
6467 asection * (*gc_mark_hook)
6468 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
6469 struct elf_link_hash_entry *, Elf_Internal_Sym *))));
6471 static boolean elf_gc_sweep
6472 PARAMS ((struct bfd_link_info *info,
6473 boolean (*gc_sweep_hook)
6474 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
6475 const Elf_Internal_Rela *relocs))));
6477 static boolean elf_gc_sweep_symbol
6478 PARAMS ((struct elf_link_hash_entry *h, PTR idxptr));
6480 static boolean elf_gc_allocate_got_offsets
6481 PARAMS ((struct elf_link_hash_entry *h, PTR offarg));
6483 static boolean elf_gc_propagate_vtable_entries_used
6484 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
6486 static boolean elf_gc_smash_unused_vtentry_relocs
6487 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
6489 /* The mark phase of garbage collection. For a given section, mark
6490 it, and all the sections which define symbols to which it refers. */
6493 elf_gc_mark (info, sec, gc_mark_hook)
6494 struct bfd_link_info *info;
6496 asection * (*gc_mark_hook)
6497 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
6498 struct elf_link_hash_entry *, Elf_Internal_Sym *));
6504 /* Look through the section relocs. */
6506 if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
6508 Elf_Internal_Rela *relstart, *rel, *relend;
6509 Elf_Internal_Shdr *symtab_hdr;
6510 struct elf_link_hash_entry **sym_hashes;
6513 Elf_External_Sym *locsyms, *freesyms = NULL;
6514 bfd *input_bfd = sec->owner;
6515 struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
6517 /* GCFIXME: how to arrange so that relocs and symbols are not
6518 reread continually? */
6520 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
6521 sym_hashes = elf_sym_hashes (input_bfd);
6523 /* Read the local symbols. */
6524 if (elf_bad_symtab (input_bfd))
6526 nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6530 extsymoff = nlocsyms = symtab_hdr->sh_info;
6531 if (symtab_hdr->contents)
6532 locsyms = (Elf_External_Sym *) symtab_hdr->contents;
6533 else if (nlocsyms == 0)
6537 locsyms = freesyms =
6538 bfd_malloc (nlocsyms * sizeof (Elf_External_Sym));
6539 if (freesyms == NULL
6540 || bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
6541 || (bfd_read (locsyms, sizeof (Elf_External_Sym),
6542 nlocsyms, input_bfd)
6543 != nlocsyms * sizeof (Elf_External_Sym)))
6550 /* Read the relocations. */
6551 relstart = (NAME(_bfd_elf,link_read_relocs)
6552 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL,
6553 info->keep_memory));
6554 if (relstart == NULL)
6559 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
6561 for (rel = relstart; rel < relend; rel++)
6563 unsigned long r_symndx;
6565 struct elf_link_hash_entry *h;
6568 r_symndx = ELF_R_SYM (rel->r_info);
6572 if (elf_bad_symtab (sec->owner))
6574 elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
6575 if (ELF_ST_BIND (s.st_info) == STB_LOCAL)
6576 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
6579 h = sym_hashes[r_symndx - extsymoff];
6580 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
6583 else if (r_symndx >= nlocsyms)
6585 h = sym_hashes[r_symndx - extsymoff];
6586 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
6590 elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s);
6591 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
6594 if (rsec && !rsec->gc_mark)
6595 if (!elf_gc_mark (info, rsec, gc_mark_hook))
6603 if (!info->keep_memory)
6613 /* The sweep phase of garbage collection. Remove all garbage sections. */
6616 elf_gc_sweep (info, gc_sweep_hook)
6617 struct bfd_link_info *info;
6618 boolean (*gc_sweep_hook)
6619 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
6620 const Elf_Internal_Rela *relocs));
6624 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
6628 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
6631 for (o = sub->sections; o != NULL; o = o->next)
6633 /* Keep special sections. Keep .debug sections. */
6634 if ((o->flags & SEC_LINKER_CREATED)
6635 || (o->flags & SEC_DEBUGGING))
6641 /* Skip sweeping sections already excluded. */
6642 if (o->flags & SEC_EXCLUDE)
6645 /* Since this is early in the link process, it is simple
6646 to remove a section from the output. */
6647 o->flags |= SEC_EXCLUDE;
6649 /* But we also have to update some of the relocation
6650 info we collected before. */
6652 && (o->flags & SEC_RELOC) && o->reloc_count > 0)
6654 Elf_Internal_Rela *internal_relocs;
6657 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
6658 (o->owner, o, NULL, NULL, info->keep_memory));
6659 if (internal_relocs == NULL)
6662 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
6664 if (!info->keep_memory)
6665 free (internal_relocs);
6673 /* Remove the symbols that were in the swept sections from the dynamic
6674 symbol table. GCFIXME: Anyone know how to get them out of the
6675 static symbol table as well? */
6679 elf_link_hash_traverse (elf_hash_table (info),
6680 elf_gc_sweep_symbol,
6683 elf_hash_table (info)->dynsymcount = i;
6689 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6692 elf_gc_sweep_symbol (h, idxptr)
6693 struct elf_link_hash_entry *h;
6696 int *idx = (int *) idxptr;
6698 if (h->dynindx != -1
6699 && ((h->root.type != bfd_link_hash_defined
6700 && h->root.type != bfd_link_hash_defweak)
6701 || h->root.u.def.section->gc_mark))
6702 h->dynindx = (*idx)++;
6707 /* Propogate collected vtable information. This is called through
6708 elf_link_hash_traverse. */
6711 elf_gc_propagate_vtable_entries_used (h, okp)
6712 struct elf_link_hash_entry *h;
6715 /* Those that are not vtables. */
6716 if (h->vtable_parent == NULL)
6719 /* Those vtables that do not have parents, we cannot merge. */
6720 if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
6723 /* If we've already been done, exit. */
6724 if (h->vtable_entries_used && h->vtable_entries_used[-1])
6727 /* Make sure the parent's table is up to date. */
6728 elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
6730 if (h->vtable_entries_used == NULL)
6732 /* None of this table's entries were referenced. Re-use the
6734 h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
6735 h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
6742 /* Or the parent's entries into ours. */
6743 cu = h->vtable_entries_used;
6745 pu = h->vtable_parent->vtable_entries_used;
6748 n = h->vtable_parent->vtable_entries_size / FILE_ALIGN;
6751 if (*pu) *cu = true;
6761 elf_gc_smash_unused_vtentry_relocs (h, okp)
6762 struct elf_link_hash_entry *h;
6766 bfd_vma hstart, hend;
6767 Elf_Internal_Rela *relstart, *relend, *rel;
6768 struct elf_backend_data *bed;
6770 /* Take care of both those symbols that do not describe vtables as
6771 well as those that are not loaded. */
6772 if (h->vtable_parent == NULL)
6775 BFD_ASSERT (h->root.type == bfd_link_hash_defined
6776 || h->root.type == bfd_link_hash_defweak);
6778 sec = h->root.u.def.section;
6779 hstart = h->root.u.def.value;
6780 hend = hstart + h->size;
6782 relstart = (NAME(_bfd_elf,link_read_relocs)
6783 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true));
6785 return *(boolean *)okp = false;
6786 bed = get_elf_backend_data (sec->owner);
6787 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
6789 for (rel = relstart; rel < relend; ++rel)
6790 if (rel->r_offset >= hstart && rel->r_offset < hend)
6792 /* If the entry is in use, do nothing. */
6793 if (h->vtable_entries_used
6794 && (rel->r_offset - hstart) < h->vtable_entries_size)
6796 bfd_vma entry = (rel->r_offset - hstart) / FILE_ALIGN;
6797 if (h->vtable_entries_used[entry])
6800 /* Otherwise, kill it. */
6801 rel->r_offset = rel->r_info = rel->r_addend = 0;
6807 /* Do mark and sweep of unused sections. */
6810 elf_gc_sections (abfd, info)
6812 struct bfd_link_info *info;
6816 asection * (*gc_mark_hook)
6817 PARAMS ((bfd *abfd, struct bfd_link_info *, Elf_Internal_Rela *,
6818 struct elf_link_hash_entry *h, Elf_Internal_Sym *));
6820 if (!get_elf_backend_data (abfd)->can_gc_sections
6821 || info->relocateable || info->emitrelocations
6822 || elf_hash_table (info)->dynamic_sections_created)
6825 /* Apply transitive closure to the vtable entry usage info. */
6826 elf_link_hash_traverse (elf_hash_table (info),
6827 elf_gc_propagate_vtable_entries_used,
6832 /* Kill the vtable relocations that were not used. */
6833 elf_link_hash_traverse (elf_hash_table (info),
6834 elf_gc_smash_unused_vtentry_relocs,
6839 /* Grovel through relocs to find out who stays ... */
6841 gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
6842 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
6846 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
6849 for (o = sub->sections; o != NULL; o = o->next)
6851 if (o->flags & SEC_KEEP)
6852 if (!elf_gc_mark (info, o, gc_mark_hook))
6857 /* ... and mark SEC_EXCLUDE for those that go. */
6858 if (!elf_gc_sweep(info, get_elf_backend_data (abfd)->gc_sweep_hook))
6864 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6867 elf_gc_record_vtinherit (abfd, sec, h, offset)
6870 struct elf_link_hash_entry *h;
6873 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
6874 struct elf_link_hash_entry **search, *child;
6875 bfd_size_type extsymcount;
6877 /* The sh_info field of the symtab header tells us where the
6878 external symbols start. We don't care about the local symbols at
6880 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
6881 if (!elf_bad_symtab (abfd))
6882 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
6884 sym_hashes = elf_sym_hashes (abfd);
6885 sym_hashes_end = sym_hashes + extsymcount;
6887 /* Hunt down the child symbol, which is in this section at the same
6888 offset as the relocation. */
6889 for (search = sym_hashes; search != sym_hashes_end; ++search)
6891 if ((child = *search) != NULL
6892 && (child->root.type == bfd_link_hash_defined
6893 || child->root.type == bfd_link_hash_defweak)
6894 && child->root.u.def.section == sec
6895 && child->root.u.def.value == offset)
6899 (*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
6900 bfd_get_filename (abfd), sec->name,
6901 (unsigned long)offset);
6902 bfd_set_error (bfd_error_invalid_operation);
6908 /* This *should* only be the absolute section. It could potentially
6909 be that someone has defined a non-global vtable though, which
6910 would be bad. It isn't worth paging in the local symbols to be
6911 sure though; that case should simply be handled by the assembler. */
6913 child->vtable_parent = (struct elf_link_hash_entry *) -1;
6916 child->vtable_parent = h;
6921 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6924 elf_gc_record_vtentry (abfd, sec, h, addend)
6925 bfd *abfd ATTRIBUTE_UNUSED;
6926 asection *sec ATTRIBUTE_UNUSED;
6927 struct elf_link_hash_entry *h;
6930 if (addend >= h->vtable_entries_size)
6933 boolean *ptr = h->vtable_entries_used;
6935 /* While the symbol is undefined, we have to be prepared to handle
6937 if (h->root.type == bfd_link_hash_undefined)
6944 /* Oops! We've got a reference past the defined end of
6945 the table. This is probably a bug -- shall we warn? */
6950 /* Allocate one extra entry for use as a "done" flag for the
6951 consolidation pass. */
6952 bytes = (size / FILE_ALIGN + 1) * sizeof (boolean);
6956 ptr = bfd_realloc (ptr - 1, bytes);
6962 oldbytes = (h->vtable_entries_size/FILE_ALIGN + 1) * sizeof (boolean);
6963 memset (((char *)ptr) + oldbytes, 0, bytes - oldbytes);
6967 ptr = bfd_zmalloc (bytes);
6972 /* And arrange for that done flag to be at index -1. */
6973 h->vtable_entries_used = ptr + 1;
6974 h->vtable_entries_size = size;
6977 h->vtable_entries_used[addend / FILE_ALIGN] = true;
6982 /* And an accompanying bit to work out final got entry offsets once
6983 we're done. Should be called from final_link. */
6986 elf_gc_common_finalize_got_offsets (abfd, info)
6988 struct bfd_link_info *info;
6991 struct elf_backend_data *bed = get_elf_backend_data (abfd);
6994 /* The GOT offset is relative to the .got section, but the GOT header is
6995 put into the .got.plt section, if the backend uses it. */
6996 if (bed->want_got_plt)
6999 gotoff = bed->got_header_size;
7001 /* Do the local .got entries first. */
7002 for (i = info->input_bfds; i; i = i->link_next)
7004 bfd_signed_vma *local_got;
7005 bfd_size_type j, locsymcount;
7006 Elf_Internal_Shdr *symtab_hdr;
7008 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
7011 local_got = elf_local_got_refcounts (i);
7015 symtab_hdr = &elf_tdata (i)->symtab_hdr;
7016 if (elf_bad_symtab (i))
7017 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
7019 locsymcount = symtab_hdr->sh_info;
7021 for (j = 0; j < locsymcount; ++j)
7023 if (local_got[j] > 0)
7025 local_got[j] = gotoff;
7026 gotoff += ARCH_SIZE / 8;
7029 local_got[j] = (bfd_vma) -1;
7033 /* Then the global .got entries. .plt refcounts are handled by
7034 adjust_dynamic_symbol */
7035 elf_link_hash_traverse (elf_hash_table (info),
7036 elf_gc_allocate_got_offsets,
7041 /* We need a special top-level link routine to convert got reference counts
7042 to real got offsets. */
7045 elf_gc_allocate_got_offsets (h, offarg)
7046 struct elf_link_hash_entry *h;
7049 bfd_vma *off = (bfd_vma *) offarg;
7051 if (h->got.refcount > 0)
7053 h->got.offset = off[0];
7054 off[0] += ARCH_SIZE / 8;
7057 h->got.offset = (bfd_vma) -1;
7062 /* Many folk need no more in the way of final link than this, once
7063 got entry reference counting is enabled. */
7066 elf_gc_common_final_link (abfd, info)
7068 struct bfd_link_info *info;
7070 if (!elf_gc_common_finalize_got_offsets (abfd, info))
7073 /* Invoke the regular ELF backend linker to do all the work. */
7074 return elf_bfd_final_link (abfd, info);
7077 /* This function will be called though elf_link_hash_traverse to store
7078 all hash value of the exported symbols in an array. */
7081 elf_collect_hash_codes (h, data)
7082 struct elf_link_hash_entry *h;
7085 unsigned long **valuep = (unsigned long **) data;
7091 /* Ignore indirect symbols. These are added by the versioning code. */
7092 if (h->dynindx == -1)
7095 name = h->root.root.string;
7096 p = strchr (name, ELF_VER_CHR);
7099 alc = bfd_malloc (p - name + 1);
7100 memcpy (alc, name, p - name);
7101 alc[p - name] = '\0';
7105 /* Compute the hash value. */
7106 ha = bfd_elf_hash (name);
7108 /* Store the found hash value in the array given as the argument. */
7111 /* And store it in the struct so that we can put it in the hash table
7113 h->elf_hash_value = ha;