2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* ELF linker code. */
23 /* This struct is used to pass information to routines called via
24 elf_link_hash_traverse which must return failure. */
26 struct elf_info_failed
29 struct bfd_link_info *info;
30 struct bfd_elf_version_tree *verdefs;
33 static boolean is_global_data_symbol_definition
34 PARAMS ((bfd *, Elf_Internal_Sym *));
35 static boolean elf_link_is_defined_archive_symbol
36 PARAMS ((bfd *, carsym *));
37 static boolean elf_link_add_object_symbols
38 PARAMS ((bfd *, struct bfd_link_info *));
39 static boolean elf_link_add_archive_symbols
40 PARAMS ((bfd *, struct bfd_link_info *));
41 static boolean elf_merge_symbol
42 PARAMS ((bfd *, struct bfd_link_info *, const char *,
43 Elf_Internal_Sym *, asection **, bfd_vma *,
44 struct elf_link_hash_entry **, boolean *, boolean *,
46 static boolean elf_add_default_symbol
47 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
48 const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
49 boolean *, boolean, boolean));
50 static boolean elf_export_symbol
51 PARAMS ((struct elf_link_hash_entry *, PTR));
52 static boolean elf_finalize_dynstr
53 PARAMS ((bfd *, struct bfd_link_info *));
54 static boolean elf_fix_symbol_flags
55 PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *));
56 static boolean elf_adjust_dynamic_symbol
57 PARAMS ((struct elf_link_hash_entry *, PTR));
58 static boolean elf_link_find_version_dependencies
59 PARAMS ((struct elf_link_hash_entry *, PTR));
60 static boolean elf_link_assign_sym_version
61 PARAMS ((struct elf_link_hash_entry *, PTR));
62 static boolean elf_collect_hash_codes
63 PARAMS ((struct elf_link_hash_entry *, PTR));
64 static boolean elf_link_read_relocs_from_section
65 PARAMS ((bfd *, Elf_Internal_Shdr *, PTR, Elf_Internal_Rela *));
66 static size_t compute_bucket_count
67 PARAMS ((struct bfd_link_info *));
68 static boolean elf_link_output_relocs
69 PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *));
70 static boolean elf_link_size_reloc_section
71 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
72 static void elf_link_adjust_relocs
73 PARAMS ((bfd *, Elf_Internal_Shdr *, unsigned int,
74 struct elf_link_hash_entry **));
75 static int elf_link_sort_cmp1
76 PARAMS ((const void *, const void *));
77 static int elf_link_sort_cmp2
78 PARAMS ((const void *, const void *));
79 static size_t elf_link_sort_relocs
80 PARAMS ((bfd *, struct bfd_link_info *, asection **));
81 static boolean elf_section_ignore_discarded_relocs
82 PARAMS ((asection *));
84 /* Given an ELF BFD, add symbols to the global hash table as
88 elf_bfd_link_add_symbols (abfd, info)
90 struct bfd_link_info *info;
92 switch (bfd_get_format (abfd))
95 return elf_link_add_object_symbols (abfd, info);
97 return elf_link_add_archive_symbols (abfd, info);
99 bfd_set_error (bfd_error_wrong_format);
104 /* Return true iff this is a non-common, definition of a non-function symbol. */
106 is_global_data_symbol_definition (abfd, sym)
107 bfd * abfd ATTRIBUTE_UNUSED;
108 Elf_Internal_Sym * sym;
110 /* Local symbols do not count, but target specific ones might. */
111 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
112 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
115 /* Function symbols do not count. */
116 if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
119 /* If the section is undefined, then so is the symbol. */
120 if (sym->st_shndx == SHN_UNDEF)
123 /* If the symbol is defined in the common section, then
124 it is a common definition and so does not count. */
125 if (sym->st_shndx == SHN_COMMON)
128 /* If the symbol is in a target specific section then we
129 must rely upon the backend to tell us what it is. */
130 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
131 /* FIXME - this function is not coded yet:
133 return _bfd_is_global_symbol_definition (abfd, sym);
135 Instead for now assume that the definition is not global,
136 Even if this is wrong, at least the linker will behave
137 in the same way that it used to do. */
143 /* Search the symbol table of the archive element of the archive ABFD
144 whose archive map contains a mention of SYMDEF, and determine if
145 the symbol is defined in this element. */
147 elf_link_is_defined_archive_symbol (abfd, symdef)
151 Elf_Internal_Shdr * hdr;
152 Elf_Internal_Shdr * shndx_hdr;
153 Elf_External_Sym * esym;
154 Elf_External_Sym * esymend;
155 Elf_External_Sym * buf = NULL;
156 Elf_External_Sym_Shndx * shndx_buf = NULL;
157 Elf_External_Sym_Shndx * shndx;
158 bfd_size_type symcount;
159 bfd_size_type extsymcount;
160 bfd_size_type extsymoff;
161 boolean result = false;
165 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
166 if (abfd == (bfd *) NULL)
169 if (! bfd_check_format (abfd, bfd_object))
172 /* If we have already included the element containing this symbol in the
173 link then we do not need to include it again. Just claim that any symbol
174 it contains is not a definition, so that our caller will not decide to
175 (re)include this element. */
176 if (abfd->archive_pass)
179 /* Select the appropriate symbol table. */
180 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
182 hdr = &elf_tdata (abfd)->symtab_hdr;
183 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
187 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
191 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
193 /* The sh_info field of the symtab header tells us where the
194 external symbols start. We don't care about the local symbols. */
195 if (elf_bad_symtab (abfd))
197 extsymcount = symcount;
202 extsymcount = symcount - hdr->sh_info;
203 extsymoff = hdr->sh_info;
206 amt = extsymcount * sizeof (Elf_External_Sym);
207 buf = (Elf_External_Sym *) bfd_malloc (amt);
208 if (buf == NULL && extsymcount != 0)
211 /* Read in the symbol table.
212 FIXME: This ought to be cached somewhere. */
213 pos = hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym);
214 if (bfd_seek (abfd, pos, SEEK_SET) != 0
215 || bfd_bread ((PTR) buf, amt, abfd) != amt)
218 if (shndx_hdr != NULL && shndx_hdr->sh_size != 0)
220 amt = extsymcount * sizeof (Elf_External_Sym_Shndx);
221 shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
222 if (shndx_buf == NULL && extsymcount != 0)
225 pos = shndx_hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym_Shndx);
226 if (bfd_seek (abfd, pos, SEEK_SET) != 0
227 || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
231 /* Scan the symbol table looking for SYMDEF. */
232 esymend = buf + extsymcount;
233 for (esym = buf, shndx = shndx_buf;
235 esym++, shndx = (shndx != NULL ? shndx + 1 : NULL))
237 Elf_Internal_Sym sym;
240 elf_swap_symbol_in (abfd, esym, shndx, &sym);
242 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
243 if (name == (const char *) NULL)
246 if (strcmp (name, symdef->name) == 0)
248 result = is_global_data_symbol_definition (abfd, & sym);
254 if (shndx_buf != NULL)
262 /* Add symbols from an ELF archive file to the linker hash table. We
263 don't use _bfd_generic_link_add_archive_symbols because of a
264 problem which arises on UnixWare. The UnixWare libc.so is an
265 archive which includes an entry libc.so.1 which defines a bunch of
266 symbols. The libc.so archive also includes a number of other
267 object files, which also define symbols, some of which are the same
268 as those defined in libc.so.1. Correct linking requires that we
269 consider each object file in turn, and include it if it defines any
270 symbols we need. _bfd_generic_link_add_archive_symbols does not do
271 this; it looks through the list of undefined symbols, and includes
272 any object file which defines them. When this algorithm is used on
273 UnixWare, it winds up pulling in libc.so.1 early and defining a
274 bunch of symbols. This means that some of the other objects in the
275 archive are not included in the link, which is incorrect since they
276 precede libc.so.1 in the archive.
278 Fortunately, ELF archive handling is simpler than that done by
279 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
280 oddities. In ELF, if we find a symbol in the archive map, and the
281 symbol is currently undefined, we know that we must pull in that
284 Unfortunately, we do have to make multiple passes over the symbol
285 table until nothing further is resolved. */
288 elf_link_add_archive_symbols (abfd, info)
290 struct bfd_link_info *info;
293 boolean *defined = NULL;
294 boolean *included = NULL;
299 if (! bfd_has_map (abfd))
301 /* An empty archive is a special case. */
302 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
304 bfd_set_error (bfd_error_no_armap);
308 /* Keep track of all symbols we know to be already defined, and all
309 files we know to be already included. This is to speed up the
310 second and subsequent passes. */
311 c = bfd_ardata (abfd)->symdef_count;
315 amt *= sizeof (boolean);
316 defined = (boolean *) bfd_malloc (amt);
317 included = (boolean *) bfd_malloc (amt);
318 if (defined == (boolean *) NULL || included == (boolean *) NULL)
320 memset (defined, 0, (size_t) amt);
321 memset (included, 0, (size_t) amt);
323 symdefs = bfd_ardata (abfd)->symdefs;
336 symdefend = symdef + c;
337 for (i = 0; symdef < symdefend; symdef++, i++)
339 struct elf_link_hash_entry *h;
341 struct bfd_link_hash_entry *undefs_tail;
344 if (defined[i] || included[i])
346 if (symdef->file_offset == last)
352 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
353 false, false, false);
359 /* If this is a default version (the name contains @@),
360 look up the symbol again without the version. The
361 effect is that references to the symbol without the
362 version will be matched by the default symbol in the
365 p = strchr (symdef->name, ELF_VER_CHR);
366 if (p == NULL || p[1] != ELF_VER_CHR)
369 copy = bfd_alloc (abfd, (bfd_size_type) (p - symdef->name + 1));
372 memcpy (copy, symdef->name, (size_t) (p - symdef->name));
373 copy[p - symdef->name] = '\0';
375 h = elf_link_hash_lookup (elf_hash_table (info), copy,
376 false, false, false);
378 bfd_release (abfd, copy);
384 if (h->root.type == bfd_link_hash_common)
386 /* We currently have a common symbol. The archive map contains
387 a reference to this symbol, so we may want to include it. We
388 only want to include it however, if this archive element
389 contains a definition of the symbol, not just another common
392 Unfortunately some archivers (including GNU ar) will put
393 declarations of common symbols into their archive maps, as
394 well as real definitions, so we cannot just go by the archive
395 map alone. Instead we must read in the element's symbol
396 table and check that to see what kind of symbol definition
398 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
401 else if (h->root.type != bfd_link_hash_undefined)
403 if (h->root.type != bfd_link_hash_undefweak)
408 /* We need to include this archive member. */
409 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
410 if (element == (bfd *) NULL)
413 if (! bfd_check_format (element, bfd_object))
416 /* Doublecheck that we have not included this object
417 already--it should be impossible, but there may be
418 something wrong with the archive. */
419 if (element->archive_pass != 0)
421 bfd_set_error (bfd_error_bad_value);
424 element->archive_pass = 1;
426 undefs_tail = info->hash->undefs_tail;
428 if (! (*info->callbacks->add_archive_element) (info, element,
431 if (! elf_link_add_object_symbols (element, info))
434 /* If there are any new undefined symbols, we need to make
435 another pass through the archive in order to see whether
436 they can be defined. FIXME: This isn't perfect, because
437 common symbols wind up on undefs_tail and because an
438 undefined symbol which is defined later on in this pass
439 does not require another pass. This isn't a bug, but it
440 does make the code less efficient than it could be. */
441 if (undefs_tail != info->hash->undefs_tail)
444 /* Look backward to mark all symbols from this object file
445 which we have already seen in this pass. */
449 included[mark] = true;
454 while (symdefs[mark].file_offset == symdef->file_offset);
456 /* We mark subsequent symbols from this object file as we go
457 on through the loop. */
458 last = symdef->file_offset;
469 if (defined != (boolean *) NULL)
471 if (included != (boolean *) NULL)
476 /* This function is called when we want to define a new symbol. It
477 handles the various cases which arise when we find a definition in
478 a dynamic object, or when there is already a definition in a
479 dynamic object. The new symbol is described by NAME, SYM, PSEC,
480 and PVALUE. We set SYM_HASH to the hash table entry. We set
481 OVERRIDE if the old symbol is overriding a new definition. We set
482 TYPE_CHANGE_OK if it is OK for the type to change. We set
483 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
484 change, we mean that we shouldn't warn if the type or size does
485 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
489 elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash,
490 override, type_change_ok, size_change_ok, dt_needed)
492 struct bfd_link_info *info;
494 Elf_Internal_Sym *sym;
497 struct elf_link_hash_entry **sym_hash;
499 boolean *type_change_ok;
500 boolean *size_change_ok;
504 struct elf_link_hash_entry *h;
507 boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
512 bind = ELF_ST_BIND (sym->st_info);
514 if (! bfd_is_und_section (sec))
515 h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false);
517 h = ((struct elf_link_hash_entry *)
518 bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false));
523 /* This code is for coping with dynamic objects, and is only useful
524 if we are doing an ELF link. */
525 if (info->hash->creator != abfd->xvec)
528 /* For merging, we only care about real symbols. */
530 while (h->root.type == bfd_link_hash_indirect
531 || h->root.type == bfd_link_hash_warning)
532 h = (struct elf_link_hash_entry *) h->root.u.i.link;
534 /* If we just created the symbol, mark it as being an ELF symbol.
535 Other than that, there is nothing to do--there is no merge issue
536 with a newly defined symbol--so we just return. */
538 if (h->root.type == bfd_link_hash_new)
540 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
544 /* OLDBFD is a BFD associated with the existing symbol. */
546 switch (h->root.type)
552 case bfd_link_hash_undefined:
553 case bfd_link_hash_undefweak:
554 oldbfd = h->root.u.undef.abfd;
557 case bfd_link_hash_defined:
558 case bfd_link_hash_defweak:
559 oldbfd = h->root.u.def.section->owner;
562 case bfd_link_hash_common:
563 oldbfd = h->root.u.c.p->section->owner;
567 /* In cases involving weak versioned symbols, we may wind up trying
568 to merge a symbol with itself. Catch that here, to avoid the
569 confusion that results if we try to override a symbol with
570 itself. The additional tests catch cases like
571 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
572 dynamic object, which we do want to handle here. */
574 && ((abfd->flags & DYNAMIC) == 0
575 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))
578 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
579 respectively, is from a dynamic object. */
581 if ((abfd->flags & DYNAMIC) != 0)
587 olddyn = (oldbfd->flags & DYNAMIC) != 0;
592 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
593 indices used by MIPS ELF. */
594 switch (h->root.type)
600 case bfd_link_hash_defined:
601 case bfd_link_hash_defweak:
602 hsec = h->root.u.def.section;
605 case bfd_link_hash_common:
606 hsec = h->root.u.c.p->section;
613 olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0;
616 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
617 respectively, appear to be a definition rather than reference. */
619 if (bfd_is_und_section (sec) || bfd_is_com_section (sec))
624 if (h->root.type == bfd_link_hash_undefined
625 || h->root.type == bfd_link_hash_undefweak
626 || h->root.type == bfd_link_hash_common)
631 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
632 symbol, respectively, appears to be a common symbol in a dynamic
633 object. If a symbol appears in an uninitialized section, and is
634 not weak, and is not a function, then it may be a common symbol
635 which was resolved when the dynamic object was created. We want
636 to treat such symbols specially, because they raise special
637 considerations when setting the symbol size: if the symbol
638 appears as a common symbol in a regular object, and the size in
639 the regular object is larger, we must make sure that we use the
640 larger size. This problematic case can always be avoided in C,
641 but it must be handled correctly when using Fortran shared
644 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
645 likewise for OLDDYNCOMMON and OLDDEF.
647 Note that this test is just a heuristic, and that it is quite
648 possible to have an uninitialized symbol in a shared object which
649 is really a definition, rather than a common symbol. This could
650 lead to some minor confusion when the symbol really is a common
651 symbol in some regular object. However, I think it will be
656 && (sec->flags & SEC_ALLOC) != 0
657 && (sec->flags & SEC_LOAD) == 0
660 && ELF_ST_TYPE (sym->st_info) != STT_FUNC)
663 newdyncommon = false;
667 && h->root.type == bfd_link_hash_defined
668 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
669 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
670 && (h->root.u.def.section->flags & SEC_LOAD) == 0
672 && h->type != STT_FUNC)
675 olddyncommon = false;
677 /* It's OK to change the type if either the existing symbol or the
678 new symbol is weak unless it comes from a DT_NEEDED entry of
679 a shared object, in which case, the DT_NEEDED entry may not be
680 required at the run time. */
682 if ((! dt_needed && h->root.type == bfd_link_hash_defweak)
683 || h->root.type == bfd_link_hash_undefweak
685 *type_change_ok = true;
687 /* It's OK to change the size if either the existing symbol or the
688 new symbol is weak, or if the old symbol is undefined. */
691 || h->root.type == bfd_link_hash_undefined)
692 *size_change_ok = true;
694 /* If both the old and the new symbols look like common symbols in a
695 dynamic object, set the size of the symbol to the larger of the
700 && sym->st_size != h->size)
702 /* Since we think we have two common symbols, issue a multiple
703 common warning if desired. Note that we only warn if the
704 size is different. If the size is the same, we simply let
705 the old symbol override the new one as normally happens with
706 symbols defined in dynamic objects. */
708 if (! ((*info->callbacks->multiple_common)
709 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
710 h->size, abfd, bfd_link_hash_common, sym->st_size)))
713 if (sym->st_size > h->size)
714 h->size = sym->st_size;
716 *size_change_ok = true;
719 /* If we are looking at a dynamic object, and we have found a
720 definition, we need to see if the symbol was already defined by
721 some other object. If so, we want to use the existing
722 definition, and we do not want to report a multiple symbol
723 definition error; we do this by clobbering *PSEC to be
726 We treat a common symbol as a definition if the symbol in the
727 shared library is a function, since common symbols always
728 represent variables; this can cause confusion in principle, but
729 any such confusion would seem to indicate an erroneous program or
730 shared library. We also permit a common symbol in a regular
731 object to override a weak symbol in a shared object.
733 We prefer a non-weak definition in a shared library to a weak
734 definition in the executable unless it comes from a DT_NEEDED
735 entry of a shared object, in which case, the DT_NEEDED entry
736 may not be required at the run time. */
741 || (h->root.type == bfd_link_hash_common
743 || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))
744 && (h->root.type != bfd_link_hash_defweak
746 || bind == STB_WEAK))
750 newdyncommon = false;
752 *psec = sec = bfd_und_section_ptr;
753 *size_change_ok = true;
755 /* If we get here when the old symbol is a common symbol, then
756 we are explicitly letting it override a weak symbol or
757 function in a dynamic object, and we don't want to warn about
758 a type change. If the old symbol is a defined symbol, a type
759 change warning may still be appropriate. */
761 if (h->root.type == bfd_link_hash_common)
762 *type_change_ok = true;
765 /* Handle the special case of an old common symbol merging with a
766 new symbol which looks like a common symbol in a shared object.
767 We change *PSEC and *PVALUE to make the new symbol look like a
768 common symbol, and let _bfd_generic_link_add_one_symbol will do
772 && h->root.type == bfd_link_hash_common)
776 newdyncommon = false;
777 *pvalue = sym->st_size;
778 *psec = sec = bfd_com_section_ptr;
779 *size_change_ok = true;
782 /* If the old symbol is from a dynamic object, and the new symbol is
783 a definition which is not from a dynamic object, then the new
784 symbol overrides the old symbol. Symbols from regular files
785 always take precedence over symbols from dynamic objects, even if
786 they are defined after the dynamic object in the link.
788 As above, we again permit a common symbol in a regular object to
789 override a definition in a shared object if the shared object
790 symbol is a function or is weak.
792 As above, we permit a non-weak definition in a shared object to
793 override a weak definition in a regular object. */
797 || (bfd_is_com_section (sec)
798 && (h->root.type == bfd_link_hash_defweak
799 || h->type == STT_FUNC)))
802 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
804 || h->root.type == bfd_link_hash_defweak))
806 /* Change the hash table entry to undefined, and let
807 _bfd_generic_link_add_one_symbol do the right thing with the
810 h->root.type = bfd_link_hash_undefined;
811 h->root.u.undef.abfd = h->root.u.def.section->owner;
812 *size_change_ok = true;
815 olddyncommon = false;
817 /* We again permit a type change when a common symbol may be
818 overriding a function. */
820 if (bfd_is_com_section (sec))
821 *type_change_ok = true;
823 /* This union may have been set to be non-NULL when this symbol
824 was seen in a dynamic object. We must force the union to be
825 NULL, so that it is correct for a regular symbol. */
827 h->verinfo.vertree = NULL;
829 /* In this special case, if H is the target of an indirection,
830 we want the caller to frob with H rather than with the
831 indirect symbol. That will permit the caller to redefine the
832 target of the indirection, rather than the indirect symbol
833 itself. FIXME: This will break the -y option if we store a
834 symbol with a different name. */
838 /* Handle the special case of a new common symbol merging with an
839 old symbol that looks like it might be a common symbol defined in
840 a shared object. Note that we have already handled the case in
841 which a new common symbol should simply override the definition
842 in the shared library. */
845 && bfd_is_com_section (sec)
848 /* It would be best if we could set the hash table entry to a
849 common symbol, but we don't know what to use for the section
851 if (! ((*info->callbacks->multiple_common)
852 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
853 h->size, abfd, bfd_link_hash_common, sym->st_size)))
856 /* If the predumed common symbol in the dynamic object is
857 larger, pretend that the new symbol has its size. */
859 if (h->size > *pvalue)
862 /* FIXME: We no longer know the alignment required by the symbol
863 in the dynamic object, so we just wind up using the one from
864 the regular object. */
867 olddyncommon = false;
869 h->root.type = bfd_link_hash_undefined;
870 h->root.u.undef.abfd = h->root.u.def.section->owner;
872 *size_change_ok = true;
873 *type_change_ok = true;
875 h->verinfo.vertree = NULL;
878 /* Handle the special case of a weak definition in a regular object
879 followed by a non-weak definition in a shared object. In this
880 case, we prefer the definition in the shared object unless it
881 comes from a DT_NEEDED entry of a shared object, in which case,
882 the DT_NEEDED entry may not be required at the run time. */
885 && h->root.type == bfd_link_hash_defweak
890 /* To make this work we have to frob the flags so that the rest
891 of the code does not think we are using the regular
893 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
894 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
895 else if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)
896 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
897 h->elf_link_hash_flags &= ~ (ELF_LINK_HASH_DEF_REGULAR
898 | ELF_LINK_HASH_DEF_DYNAMIC);
900 /* If H is the target of an indirection, we want the caller to
901 use H rather than the indirect symbol. Otherwise if we are
902 defining a new indirect symbol we will wind up attaching it
903 to the entry we are overriding. */
907 /* Handle the special case of a non-weak definition in a shared
908 object followed by a weak definition in a regular object. In
909 this case we prefer to definition in the shared object. To make
910 this work we have to tell the caller to not treat the new symbol
914 && h->root.type != bfd_link_hash_defweak
923 /* This function is called to create an indirect symbol from the
924 default for the symbol with the default version if needed. The
925 symbol is described by H, NAME, SYM, SEC, VALUE, and OVERRIDE. We
926 set DYNSYM if the new indirect symbol is dynamic. DT_NEEDED
927 indicates if it comes from a DT_NEEDED entry of a shared object. */
930 elf_add_default_symbol (abfd, info, h, name, sym, sec, value,
931 dynsym, override, dt_needed)
933 struct bfd_link_info *info;
934 struct elf_link_hash_entry *h;
936 Elf_Internal_Sym *sym;
943 boolean type_change_ok;
944 boolean size_change_ok;
946 struct elf_link_hash_entry *hi;
947 struct elf_backend_data *bed;
952 /* If this symbol has a version, and it is the default version, we
953 create an indirect symbol from the default name to the fully
954 decorated name. This will cause external references which do not
955 specify a version to be bound to this version of the symbol. */
956 p = strchr (name, ELF_VER_CHR);
957 if (p == NULL || p[1] != ELF_VER_CHR)
962 /* We are overridden by an old defition. We need to check if we
963 need to crreate the indirect symbol from the default name. */
964 hi = elf_link_hash_lookup (elf_hash_table (info), name, true,
966 BFD_ASSERT (hi != NULL);
969 while (hi->root.type == bfd_link_hash_indirect
970 || hi->root.type == bfd_link_hash_warning)
972 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
978 bed = get_elf_backend_data (abfd);
979 collect = bed->collect;
980 dynamic = (abfd->flags & DYNAMIC) != 0;
982 shortname = bfd_hash_allocate (&info->hash->table,
983 (size_t) (p - name + 1));
984 if (shortname == NULL)
986 strncpy (shortname, name, (size_t) (p - name));
987 shortname [p - name] = '\0';
989 /* We are going to create a new symbol. Merge it with any existing
990 symbol with this name. For the purposes of the merge, act as
991 though we were defining the symbol we just defined, although we
992 actually going to define an indirect symbol. */
993 type_change_ok = false;
994 size_change_ok = false;
995 if (! elf_merge_symbol (abfd, info, shortname, sym, sec, value,
996 &hi, &override, &type_change_ok,
997 &size_change_ok, dt_needed))
1002 if (! (_bfd_generic_link_add_one_symbol
1003 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1004 (bfd_vma) 0, name, false, collect,
1005 (struct bfd_link_hash_entry **) &hi)))
1010 /* In this case the symbol named SHORTNAME is overriding the
1011 indirect symbol we want to add. We were planning on making
1012 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1013 is the name without a version. NAME is the fully versioned
1014 name, and it is the default version.
1016 Overriding means that we already saw a definition for the
1017 symbol SHORTNAME in a regular object, and it is overriding
1018 the symbol defined in the dynamic object.
1020 When this happens, we actually want to change NAME, the
1021 symbol we just added, to refer to SHORTNAME. This will cause
1022 references to NAME in the shared object to become references
1023 to SHORTNAME in the regular object. This is what we expect
1024 when we override a function in a shared object: that the
1025 references in the shared object will be mapped to the
1026 definition in the regular object. */
1028 while (hi->root.type == bfd_link_hash_indirect
1029 || hi->root.type == bfd_link_hash_warning)
1030 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1032 h->root.type = bfd_link_hash_indirect;
1033 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1034 if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC)
1036 h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC;
1037 hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
1038 if (hi->elf_link_hash_flags
1039 & (ELF_LINK_HASH_REF_REGULAR
1040 | ELF_LINK_HASH_DEF_REGULAR))
1042 if (! _bfd_elf_link_record_dynamic_symbol (info, hi))
1047 /* Now set HI to H, so that the following code will set the
1048 other fields correctly. */
1052 /* If there is a duplicate definition somewhere, then HI may not
1053 point to an indirect symbol. We will have reported an error to
1054 the user in that case. */
1056 if (hi->root.type == bfd_link_hash_indirect)
1058 struct elf_link_hash_entry *ht;
1060 /* If the symbol became indirect, then we assume that we have
1061 not seen a definition before. */
1062 BFD_ASSERT ((hi->elf_link_hash_flags
1063 & (ELF_LINK_HASH_DEF_DYNAMIC
1064 | ELF_LINK_HASH_DEF_REGULAR)) == 0);
1066 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1067 (*bed->elf_backend_copy_indirect_symbol) (ht, hi);
1069 /* See if the new flags lead us to realize that the symbol must
1076 || ((hi->elf_link_hash_flags
1077 & ELF_LINK_HASH_REF_DYNAMIC) != 0))
1082 if ((hi->elf_link_hash_flags
1083 & ELF_LINK_HASH_REF_REGULAR) != 0)
1089 /* We also need to define an indirection from the nondefault version
1092 shortname = bfd_hash_allocate (&info->hash->table, strlen (name));
1093 if (shortname == NULL)
1095 strncpy (shortname, name, (size_t) (p - name));
1096 strcpy (shortname + (p - name), p + 1);
1098 /* Once again, merge with any existing symbol. */
1099 type_change_ok = false;
1100 size_change_ok = false;
1101 if (! elf_merge_symbol (abfd, info, shortname, sym, sec, value,
1102 &hi, &override, &type_change_ok,
1103 &size_change_ok, dt_needed))
1108 /* Here SHORTNAME is a versioned name, so we don't expect to see
1109 the type of override we do in the case above. */
1110 (*_bfd_error_handler)
1111 (_("%s: warning: unexpected redefinition of `%s'"),
1112 bfd_archive_filename (abfd), shortname);
1116 if (! (_bfd_generic_link_add_one_symbol
1117 (info, abfd, shortname, BSF_INDIRECT,
1118 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1119 collect, (struct bfd_link_hash_entry **) &hi)))
1122 /* If there is a duplicate definition somewhere, then HI may not
1123 point to an indirect symbol. We will have reported an error
1124 to the user in that case. */
1126 if (hi->root.type == bfd_link_hash_indirect)
1128 /* If the symbol became indirect, then we assume that we have
1129 not seen a definition before. */
1130 BFD_ASSERT ((hi->elf_link_hash_flags
1131 & (ELF_LINK_HASH_DEF_DYNAMIC
1132 | ELF_LINK_HASH_DEF_REGULAR)) == 0);
1134 (*bed->elf_backend_copy_indirect_symbol) (h, hi);
1136 /* See if the new flags lead us to realize that the symbol
1143 || ((hi->elf_link_hash_flags
1144 & ELF_LINK_HASH_REF_DYNAMIC) != 0))
1149 if ((hi->elf_link_hash_flags
1150 & ELF_LINK_HASH_REF_REGULAR) != 0)
1160 /* Add symbols from an ELF object file to the linker hash table. */
1163 elf_link_add_object_symbols (abfd, info)
1165 struct bfd_link_info *info;
1167 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
1168 const Elf_Internal_Sym *,
1169 const char **, flagword *,
1170 asection **, bfd_vma *));
1171 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
1172 asection *, const Elf_Internal_Rela *));
1174 Elf_Internal_Shdr *hdr;
1175 Elf_Internal_Shdr *shndx_hdr;
1176 bfd_size_type symcount;
1177 bfd_size_type extsymcount;
1178 bfd_size_type extsymoff;
1179 Elf_External_Sym *buf = NULL;
1180 Elf_External_Sym_Shndx *shndx_buf = NULL;
1181 Elf_External_Sym_Shndx *shndx;
1182 struct elf_link_hash_entry **sym_hash;
1184 Elf_External_Versym *extversym = NULL;
1185 Elf_External_Versym *ever;
1186 Elf_External_Dyn *dynbuf = NULL;
1187 struct elf_link_hash_entry *weaks;
1188 Elf_External_Sym *esym;
1189 Elf_External_Sym *esymend;
1190 struct elf_backend_data *bed;
1192 struct elf_link_hash_table * hash_table;
1196 hash_table = elf_hash_table (info);
1198 bed = get_elf_backend_data (abfd);
1199 add_symbol_hook = bed->elf_add_symbol_hook;
1200 collect = bed->collect;
1202 if ((abfd->flags & DYNAMIC) == 0)
1208 /* You can't use -r against a dynamic object. Also, there's no
1209 hope of using a dynamic object which does not exactly match
1210 the format of the output file. */
1211 if (info->relocateable || info->hash->creator != abfd->xvec)
1213 bfd_set_error (bfd_error_invalid_operation);
1218 /* As a GNU extension, any input sections which are named
1219 .gnu.warning.SYMBOL are treated as warning symbols for the given
1220 symbol. This differs from .gnu.warning sections, which generate
1221 warnings when they are included in an output file. */
1226 for (s = abfd->sections; s != NULL; s = s->next)
1230 name = bfd_get_section_name (abfd, s);
1231 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
1236 name += sizeof ".gnu.warning." - 1;
1238 /* If this is a shared object, then look up the symbol
1239 in the hash table. If it is there, and it is already
1240 been defined, then we will not be using the entry
1241 from this shared object, so we don't need to warn.
1242 FIXME: If we see the definition in a regular object
1243 later on, we will warn, but we shouldn't. The only
1244 fix is to keep track of what warnings we are supposed
1245 to emit, and then handle them all at the end of the
1247 if (dynamic && abfd->xvec == info->hash->creator)
1249 struct elf_link_hash_entry *h;
1251 h = elf_link_hash_lookup (hash_table, name,
1252 false, false, true);
1254 /* FIXME: What about bfd_link_hash_common? */
1256 && (h->root.type == bfd_link_hash_defined
1257 || h->root.type == bfd_link_hash_defweak))
1259 /* We don't want to issue this warning. Clobber
1260 the section size so that the warning does not
1261 get copied into the output file. */
1267 sz = bfd_section_size (abfd, s);
1268 msg = (char *) bfd_alloc (abfd, sz + 1);
1272 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
1277 if (! (_bfd_generic_link_add_one_symbol
1278 (info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg,
1279 false, collect, (struct bfd_link_hash_entry **) NULL)))
1282 if (! info->relocateable)
1284 /* Clobber the section size so that the warning does
1285 not get copied into the output file. */
1292 /* If this is a dynamic object, we always link against the .dynsym
1293 symbol table, not the .symtab symbol table. The dynamic linker
1294 will only see the .dynsym symbol table, so there is no reason to
1295 look at .symtab for a dynamic object. */
1297 if (! dynamic || elf_dynsymtab (abfd) == 0)
1299 hdr = &elf_tdata (abfd)->symtab_hdr;
1300 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
1304 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
1310 /* Read in any version definitions. */
1312 if (! _bfd_elf_slurp_version_tables (abfd))
1315 /* Read in the symbol versions, but don't bother to convert them
1316 to internal format. */
1317 if (elf_dynversym (abfd) != 0)
1319 Elf_Internal_Shdr *versymhdr;
1321 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
1322 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
1323 if (extversym == NULL)
1325 amt = versymhdr->sh_size;
1326 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
1327 || bfd_bread ((PTR) extversym, amt, abfd) != amt)
1332 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1334 /* The sh_info field of the symtab header tells us where the
1335 external symbols start. We don't care about the local symbols at
1337 if (elf_bad_symtab (abfd))
1339 extsymcount = symcount;
1344 extsymcount = symcount - hdr->sh_info;
1345 extsymoff = hdr->sh_info;
1348 amt = extsymcount * sizeof (Elf_External_Sym);
1349 buf = (Elf_External_Sym *) bfd_malloc (amt);
1350 if (buf == NULL && extsymcount != 0)
1353 if (shndx_hdr != NULL && shndx_hdr->sh_size != 0)
1355 amt = extsymcount * sizeof (Elf_External_Sym_Shndx);
1356 shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
1357 if (shndx_buf == NULL && extsymcount != 0)
1361 /* We store a pointer to the hash table entry for each external
1363 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
1364 sym_hash = (struct elf_link_hash_entry **) bfd_alloc (abfd, amt);
1365 if (sym_hash == NULL)
1367 elf_sym_hashes (abfd) = sym_hash;
1373 /* If we are creating a shared library, create all the dynamic
1374 sections immediately. We need to attach them to something,
1375 so we attach them to this BFD, provided it is the right
1376 format. FIXME: If there are no input BFD's of the same
1377 format as the output, we can't make a shared library. */
1379 && is_elf_hash_table (info)
1380 && ! hash_table->dynamic_sections_created
1381 && abfd->xvec == info->hash->creator)
1383 if (! elf_link_create_dynamic_sections (abfd, info))
1387 else if (! is_elf_hash_table (info))
1394 bfd_size_type oldsize;
1395 bfd_size_type strindex;
1397 /* Find the name to use in a DT_NEEDED entry that refers to this
1398 object. If the object has a DT_SONAME entry, we use it.
1399 Otherwise, if the generic linker stuck something in
1400 elf_dt_name, we use that. Otherwise, we just use the file
1401 name. If the generic linker put a null string into
1402 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1403 there is a DT_SONAME entry. */
1405 name = bfd_get_filename (abfd);
1406 if (elf_dt_name (abfd) != NULL)
1408 name = elf_dt_name (abfd);
1411 if (elf_dt_soname (abfd) != NULL)
1417 s = bfd_get_section_by_name (abfd, ".dynamic");
1420 Elf_External_Dyn *extdyn;
1421 Elf_External_Dyn *extdynend;
1423 unsigned long shlink;
1427 dynbuf = (Elf_External_Dyn *) bfd_malloc (s->_raw_size);
1431 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
1432 (file_ptr) 0, s->_raw_size))
1435 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1438 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
1441 /* The shared libraries distributed with hpux11 have a bogus
1442 sh_link field for the ".dynamic" section. This code detects
1443 when SHLINK refers to a section that is not a string table
1444 and tries to find the string table for the ".dynsym" section
1446 Elf_Internal_Shdr *shdr = elf_elfsections (abfd)[shlink];
1447 if (shdr->sh_type != SHT_STRTAB)
1449 asection *ds = bfd_get_section_by_name (abfd, ".dynsym");
1450 int elfdsec = _bfd_elf_section_from_bfd_section (abfd, ds);
1453 shlink = elf_elfsections (abfd)[elfdsec]->sh_link;
1458 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
1461 for (; extdyn < extdynend; extdyn++)
1463 Elf_Internal_Dyn dyn;
1465 elf_swap_dyn_in (abfd, extdyn, &dyn);
1466 if (dyn.d_tag == DT_SONAME)
1468 unsigned int tagv = dyn.d_un.d_val;
1469 name = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1473 if (dyn.d_tag == DT_NEEDED)
1475 struct bfd_link_needed_list *n, **pn;
1477 unsigned int tagv = dyn.d_un.d_val;
1479 amt = sizeof (struct bfd_link_needed_list);
1480 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1481 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1482 if (n == NULL || fnm == NULL)
1484 anm = bfd_alloc (abfd, (bfd_size_type) strlen (fnm) + 1);
1491 for (pn = & hash_table->needed;
1497 if (dyn.d_tag == DT_RUNPATH)
1499 struct bfd_link_needed_list *n, **pn;
1501 unsigned int tagv = dyn.d_un.d_val;
1503 /* When we see DT_RPATH before DT_RUNPATH, we have
1504 to clear runpath. Do _NOT_ bfd_release, as that
1505 frees all more recently bfd_alloc'd blocks as
1507 if (rpath && hash_table->runpath)
1508 hash_table->runpath = NULL;
1510 amt = sizeof (struct bfd_link_needed_list);
1511 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1512 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1513 if (n == NULL || fnm == NULL)
1515 anm = bfd_alloc (abfd, (bfd_size_type) strlen (fnm) + 1);
1522 for (pn = & hash_table->runpath;
1530 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1531 if (!runpath && dyn.d_tag == DT_RPATH)
1533 struct bfd_link_needed_list *n, **pn;
1535 unsigned int tagv = dyn.d_un.d_val;
1537 amt = sizeof (struct bfd_link_needed_list);
1538 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1539 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1540 if (n == NULL || fnm == NULL)
1542 anm = bfd_alloc (abfd, (bfd_size_type) strlen (fnm) + 1);
1549 for (pn = & hash_table->runpath;
1562 /* We do not want to include any of the sections in a dynamic
1563 object in the output file. We hack by simply clobbering the
1564 list of sections in the BFD. This could be handled more
1565 cleanly by, say, a new section flag; the existing
1566 SEC_NEVER_LOAD flag is not the one we want, because that one
1567 still implies that the section takes up space in the output
1569 bfd_section_list_clear (abfd);
1571 /* If this is the first dynamic object found in the link, create
1572 the special sections required for dynamic linking. */
1573 if (! hash_table->dynamic_sections_created)
1574 if (! elf_link_create_dynamic_sections (abfd, info))
1579 /* Add a DT_NEEDED entry for this dynamic object. */
1580 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
1581 strindex = _bfd_elf_strtab_add (hash_table->dynstr, name, false);
1582 if (strindex == (bfd_size_type) -1)
1585 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
1588 Elf_External_Dyn *dyncon, *dynconend;
1590 /* The hash table size did not change, which means that
1591 the dynamic object name was already entered. If we
1592 have already included this dynamic object in the
1593 link, just ignore it. There is no reason to include
1594 a particular dynamic object more than once. */
1595 sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
1596 BFD_ASSERT (sdyn != NULL);
1598 dyncon = (Elf_External_Dyn *) sdyn->contents;
1599 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1601 for (; dyncon < dynconend; dyncon++)
1603 Elf_Internal_Dyn dyn;
1605 elf_swap_dyn_in (hash_table->dynobj, dyncon, & dyn);
1606 if (dyn.d_tag == DT_NEEDED
1607 && dyn.d_un.d_val == strindex)
1611 if (extversym != NULL)
1613 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
1619 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NEEDED, strindex))
1623 /* Save the SONAME, if there is one, because sometimes the
1624 linker emulation code will need to know it. */
1626 name = basename (bfd_get_filename (abfd));
1627 elf_dt_name (abfd) = name;
1630 pos = hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym);
1631 amt = extsymcount * sizeof (Elf_External_Sym);
1632 if (bfd_seek (abfd, pos, SEEK_SET) != 0
1633 || bfd_bread ((PTR) buf, amt, abfd) != amt)
1636 if (shndx_hdr != NULL && shndx_hdr->sh_size != 0)
1638 amt = extsymcount * sizeof (Elf_External_Sym_Shndx);
1639 pos = shndx_hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym_Shndx);
1640 if (bfd_seek (abfd, pos, SEEK_SET) != 0
1641 || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
1647 ever = extversym != NULL ? extversym + extsymoff : NULL;
1648 esymend = buf + extsymcount;
1649 for (esym = buf, shndx = shndx_buf;
1651 esym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL),
1652 shndx = (shndx != NULL ? shndx + 1 : NULL))
1654 Elf_Internal_Sym sym;
1660 struct elf_link_hash_entry *h;
1662 boolean size_change_ok, type_change_ok;
1663 boolean new_weakdef;
1664 unsigned int old_alignment;
1669 elf_swap_symbol_in (abfd, esym, shndx, &sym);
1671 flags = BSF_NO_FLAGS;
1673 value = sym.st_value;
1676 bind = ELF_ST_BIND (sym.st_info);
1677 if (bind == STB_LOCAL)
1679 /* This should be impossible, since ELF requires that all
1680 global symbols follow all local symbols, and that sh_info
1681 point to the first global symbol. Unfortunatealy, Irix 5
1685 else if (bind == STB_GLOBAL)
1687 if (sym.st_shndx != SHN_UNDEF
1688 && sym.st_shndx != SHN_COMMON)
1691 else if (bind == STB_WEAK)
1695 /* Leave it up to the processor backend. */
1698 if (sym.st_shndx == SHN_UNDEF)
1699 sec = bfd_und_section_ptr;
1700 else if (sym.st_shndx < SHN_LORESERVE || sym.st_shndx > SHN_HIRESERVE)
1702 sec = section_from_elf_index (abfd, sym.st_shndx);
1704 sec = bfd_abs_section_ptr;
1705 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
1708 else if (sym.st_shndx == SHN_ABS)
1709 sec = bfd_abs_section_ptr;
1710 else if (sym.st_shndx == SHN_COMMON)
1712 sec = bfd_com_section_ptr;
1713 /* What ELF calls the size we call the value. What ELF
1714 calls the value we call the alignment. */
1715 value = sym.st_size;
1719 /* Leave it up to the processor backend. */
1722 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
1723 if (name == (const char *) NULL)
1726 if (add_symbol_hook)
1728 if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
1732 /* The hook function sets the name to NULL if this symbol
1733 should be skipped for some reason. */
1734 if (name == (const char *) NULL)
1738 /* Sanity check that all possibilities were handled. */
1739 if (sec == (asection *) NULL)
1741 bfd_set_error (bfd_error_bad_value);
1745 if (bfd_is_und_section (sec)
1746 || bfd_is_com_section (sec))
1751 size_change_ok = false;
1752 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
1754 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1756 Elf_Internal_Versym iver;
1757 unsigned int vernum = 0;
1761 _bfd_elf_swap_versym_in (abfd, ever, &iver);
1762 vernum = iver.vs_vers & VERSYM_VERSION;
1764 /* If this is a hidden symbol, or if it is not version
1765 1, we append the version name to the symbol name.
1766 However, we do not modify a non-hidden absolute
1767 symbol, because it might be the version symbol
1768 itself. FIXME: What if it isn't? */
1769 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
1770 || (vernum > 1 && ! bfd_is_abs_section (sec)))
1773 unsigned int namelen;
1774 bfd_size_type newlen;
1777 if (sym.st_shndx != SHN_UNDEF)
1779 if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
1781 (*_bfd_error_handler)
1782 (_("%s: %s: invalid version %u (max %d)"),
1783 bfd_archive_filename (abfd), name, vernum,
1784 elf_tdata (abfd)->dynverdef_hdr.sh_info);
1785 bfd_set_error (bfd_error_bad_value);
1788 else if (vernum > 1)
1790 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
1796 /* We cannot simply test for the number of
1797 entries in the VERNEED section since the
1798 numbers for the needed versions do not start
1800 Elf_Internal_Verneed *t;
1803 for (t = elf_tdata (abfd)->verref;
1807 Elf_Internal_Vernaux *a;
1809 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1811 if (a->vna_other == vernum)
1813 verstr = a->vna_nodename;
1822 (*_bfd_error_handler)
1823 (_("%s: %s: invalid needed version %d"),
1824 bfd_archive_filename (abfd), name, vernum);
1825 bfd_set_error (bfd_error_bad_value);
1830 namelen = strlen (name);
1831 newlen = namelen + strlen (verstr) + 2;
1832 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
1835 newname = (char *) bfd_alloc (abfd, newlen);
1836 if (newname == NULL)
1838 strcpy (newname, name);
1839 p = newname + namelen;
1841 /* If this is a defined non-hidden version symbol,
1842 we add another @ to the name. This indicates the
1843 default version of the symbol. */
1844 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
1845 && sym.st_shndx != SHN_UNDEF)
1853 if (! elf_merge_symbol (abfd, info, name, &sym, &sec, &value,
1854 sym_hash, &override, &type_change_ok,
1855 &size_change_ok, dt_needed))
1862 while (h->root.type == bfd_link_hash_indirect
1863 || h->root.type == bfd_link_hash_warning)
1864 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1866 /* Remember the old alignment if this is a common symbol, so
1867 that we don't reduce the alignment later on. We can't
1868 check later, because _bfd_generic_link_add_one_symbol
1869 will set a default for the alignment which we want to
1871 if (h->root.type == bfd_link_hash_common)
1872 old_alignment = h->root.u.c.p->alignment_power;
1874 if (elf_tdata (abfd)->verdef != NULL
1878 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
1881 if (! (_bfd_generic_link_add_one_symbol
1882 (info, abfd, name, flags, sec, value, (const char *) NULL,
1883 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
1887 while (h->root.type == bfd_link_hash_indirect
1888 || h->root.type == bfd_link_hash_warning)
1889 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1892 new_weakdef = false;
1895 && (flags & BSF_WEAK) != 0
1896 && ELF_ST_TYPE (sym.st_info) != STT_FUNC
1897 && info->hash->creator->flavour == bfd_target_elf_flavour
1898 && h->weakdef == NULL)
1900 /* Keep a list of all weak defined non function symbols from
1901 a dynamic object, using the weakdef field. Later in this
1902 function we will set the weakdef field to the correct
1903 value. We only put non-function symbols from dynamic
1904 objects on this list, because that happens to be the only
1905 time we need to know the normal symbol corresponding to a
1906 weak symbol, and the information is time consuming to
1907 figure out. If the weakdef field is not already NULL,
1908 then this symbol was already defined by some previous
1909 dynamic object, and we will be using that previous
1910 definition anyhow. */
1917 /* Set the alignment of a common symbol. */
1918 if (sym.st_shndx == SHN_COMMON
1919 && h->root.type == bfd_link_hash_common)
1923 align = bfd_log2 (sym.st_value);
1924 if (align > old_alignment
1925 /* Permit an alignment power of zero if an alignment of one
1926 is specified and no other alignments have been specified. */
1927 || (sym.st_value == 1 && old_alignment == 0))
1928 h->root.u.c.p->alignment_power = align;
1931 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1937 /* Remember the symbol size and type. */
1938 if (sym.st_size != 0
1939 && (definition || h->size == 0))
1941 if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
1942 (*_bfd_error_handler)
1943 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1944 name, (unsigned long) h->size, (unsigned long) sym.st_size,
1945 bfd_archive_filename (abfd));
1947 h->size = sym.st_size;
1950 /* If this is a common symbol, then we always want H->SIZE
1951 to be the size of the common symbol. The code just above
1952 won't fix the size if a common symbol becomes larger. We
1953 don't warn about a size change here, because that is
1954 covered by --warn-common. */
1955 if (h->root.type == bfd_link_hash_common)
1956 h->size = h->root.u.c.size;
1958 if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
1959 && (definition || h->type == STT_NOTYPE))
1961 if (h->type != STT_NOTYPE
1962 && h->type != ELF_ST_TYPE (sym.st_info)
1963 && ! type_change_ok)
1964 (*_bfd_error_handler)
1965 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1966 name, h->type, ELF_ST_TYPE (sym.st_info),
1967 bfd_archive_filename (abfd));
1969 h->type = ELF_ST_TYPE (sym.st_info);
1972 /* If st_other has a processor-specific meaning, specific code
1973 might be needed here. */
1974 if (sym.st_other != 0)
1976 /* Combine visibilities, using the most constraining one. */
1977 unsigned char hvis = ELF_ST_VISIBILITY (h->other);
1978 unsigned char symvis = ELF_ST_VISIBILITY (sym.st_other);
1980 if (symvis && (hvis > symvis || hvis == 0))
1981 h->other = sym.st_other;
1983 /* If neither has visibility, use the st_other of the
1984 definition. This is an arbitrary choice, since the
1985 other bits have no general meaning. */
1986 if (!symvis && !hvis
1987 && (definition || h->other == 0))
1988 h->other = sym.st_other;
1991 /* Set a flag in the hash table entry indicating the type of
1992 reference or definition we just found. Keep a count of
1993 the number of dynamic symbols we find. A dynamic symbol
1994 is one which is referenced or defined by both a regular
1995 object and a shared object. */
1996 old_flags = h->elf_link_hash_flags;
2002 new_flag = ELF_LINK_HASH_REF_REGULAR;
2003 if (bind != STB_WEAK)
2004 new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK;
2007 new_flag = ELF_LINK_HASH_DEF_REGULAR;
2009 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2010 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
2016 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
2018 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
2019 if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
2020 | ELF_LINK_HASH_REF_REGULAR)) != 0
2021 || (h->weakdef != NULL
2023 && h->weakdef->dynindx != -1))
2027 h->elf_link_hash_flags |= new_flag;
2029 /* Check to see if we need to add an indirect symbol for
2030 the default name. */
2031 if (definition || h->root.type == bfd_link_hash_common)
2032 if (! elf_add_default_symbol (abfd, info, h, name, &sym,
2033 &sec, &value, &dynsym,
2034 override, dt_needed))
2037 if (dynsym && h->dynindx == -1)
2039 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2041 if (h->weakdef != NULL
2043 && h->weakdef->dynindx == -1)
2045 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2049 else if (dynsym && h->dynindx != -1)
2050 /* If the symbol already has a dynamic index, but
2051 visibility says it should not be visible, turn it into
2053 switch (ELF_ST_VISIBILITY (h->other))
2057 (*bed->elf_backend_hide_symbol) (info, h, true);
2061 if (dt_needed && definition
2062 && (h->elf_link_hash_flags
2063 & ELF_LINK_HASH_REF_REGULAR) != 0)
2065 bfd_size_type oldsize;
2066 bfd_size_type strindex;
2068 if (! is_elf_hash_table (info))
2071 /* The symbol from a DT_NEEDED object is referenced from
2072 the regular object to create a dynamic executable. We
2073 have to make sure there is a DT_NEEDED entry for it. */
2076 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
2077 strindex = _bfd_elf_strtab_add (hash_table->dynstr,
2078 elf_dt_soname (abfd), false);
2079 if (strindex == (bfd_size_type) -1)
2082 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
2085 Elf_External_Dyn *dyncon, *dynconend;
2087 sdyn = bfd_get_section_by_name (hash_table->dynobj,
2089 BFD_ASSERT (sdyn != NULL);
2091 dyncon = (Elf_External_Dyn *) sdyn->contents;
2092 dynconend = (Elf_External_Dyn *) (sdyn->contents +
2094 for (; dyncon < dynconend; dyncon++)
2096 Elf_Internal_Dyn dyn;
2098 elf_swap_dyn_in (hash_table->dynobj,
2100 BFD_ASSERT (dyn.d_tag != DT_NEEDED ||
2101 dyn.d_un.d_val != strindex);
2105 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NEEDED, strindex))
2111 /* Now set the weakdefs field correctly for all the weak defined
2112 symbols we found. The only way to do this is to search all the
2113 symbols. Since we only need the information for non functions in
2114 dynamic objects, that's the only time we actually put anything on
2115 the list WEAKS. We need this information so that if a regular
2116 object refers to a symbol defined weakly in a dynamic object, the
2117 real symbol in the dynamic object is also put in the dynamic
2118 symbols; we also must arrange for both symbols to point to the
2119 same memory location. We could handle the general case of symbol
2120 aliasing, but a general symbol alias can only be generated in
2121 assembler code, handling it correctly would be very time
2122 consuming, and other ELF linkers don't handle general aliasing
2124 while (weaks != NULL)
2126 struct elf_link_hash_entry *hlook;
2129 struct elf_link_hash_entry **hpp;
2130 struct elf_link_hash_entry **hppend;
2133 weaks = hlook->weakdef;
2134 hlook->weakdef = NULL;
2136 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
2137 || hlook->root.type == bfd_link_hash_defweak
2138 || hlook->root.type == bfd_link_hash_common
2139 || hlook->root.type == bfd_link_hash_indirect);
2140 slook = hlook->root.u.def.section;
2141 vlook = hlook->root.u.def.value;
2143 hpp = elf_sym_hashes (abfd);
2144 hppend = hpp + extsymcount;
2145 for (; hpp < hppend; hpp++)
2147 struct elf_link_hash_entry *h;
2150 if (h != NULL && h != hlook
2151 && h->root.type == bfd_link_hash_defined
2152 && h->root.u.def.section == slook
2153 && h->root.u.def.value == vlook)
2157 /* If the weak definition is in the list of dynamic
2158 symbols, make sure the real definition is put there
2160 if (hlook->dynindx != -1
2161 && h->dynindx == -1)
2163 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2167 /* If the real definition is in the list of dynamic
2168 symbols, make sure the weak definition is put there
2169 as well. If we don't do this, then the dynamic
2170 loader might not merge the entries for the real
2171 definition and the weak definition. */
2172 if (h->dynindx != -1
2173 && hlook->dynindx == -1)
2175 if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
2190 if (extversym != NULL)
2196 /* If this object is the same format as the output object, and it is
2197 not a shared library, then let the backend look through the
2200 This is required to build global offset table entries and to
2201 arrange for dynamic relocs. It is not required for the
2202 particular common case of linking non PIC code, even when linking
2203 against shared libraries, but unfortunately there is no way of
2204 knowing whether an object file has been compiled PIC or not.
2205 Looking through the relocs is not particularly time consuming.
2206 The problem is that we must either (1) keep the relocs in memory,
2207 which causes the linker to require additional runtime memory or
2208 (2) read the relocs twice from the input file, which wastes time.
2209 This would be a good case for using mmap.
2211 I have no idea how to handle linking PIC code into a file of a
2212 different format. It probably can't be done. */
2213 check_relocs = get_elf_backend_data (abfd)->check_relocs;
2215 && abfd->xvec == info->hash->creator
2216 && check_relocs != NULL)
2220 for (o = abfd->sections; o != NULL; o = o->next)
2222 Elf_Internal_Rela *internal_relocs;
2225 if ((o->flags & SEC_RELOC) == 0
2226 || o->reloc_count == 0
2227 || ((info->strip == strip_all || info->strip == strip_debugger)
2228 && (o->flags & SEC_DEBUGGING) != 0)
2229 || bfd_is_abs_section (o->output_section))
2232 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2233 (abfd, o, (PTR) NULL,
2234 (Elf_Internal_Rela *) NULL,
2235 info->keep_memory));
2236 if (internal_relocs == NULL)
2239 ok = (*check_relocs) (abfd, info, o, internal_relocs);
2241 if (! info->keep_memory)
2242 free (internal_relocs);
2249 /* If this is a non-traditional, non-relocateable link, try to
2250 optimize the handling of the .stab/.stabstr sections. */
2252 && ! info->relocateable
2253 && ! info->traditional_format
2254 && info->hash->creator->flavour == bfd_target_elf_flavour
2255 && is_elf_hash_table (info)
2256 && (info->strip != strip_all && info->strip != strip_debugger))
2258 asection *stab, *stabstr;
2260 stab = bfd_get_section_by_name (abfd, ".stab");
2262 && (stab->flags & SEC_MERGE) == 0
2263 && !bfd_is_abs_section (stab->output_section))
2265 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
2267 if (stabstr != NULL)
2269 struct bfd_elf_section_data *secdata;
2271 secdata = elf_section_data (stab);
2272 if (! _bfd_link_section_stabs (abfd,
2273 & hash_table->stab_info,
2275 &secdata->sec_info))
2277 if (secdata->sec_info)
2278 secdata->sec_info_type = ELF_INFO_TYPE_STABS;
2283 if (! info->relocateable && ! dynamic
2284 && is_elf_hash_table (info))
2288 for (s = abfd->sections; s != NULL; s = s->next)
2289 if ((s->flags & SEC_MERGE) != 0
2290 && !bfd_is_abs_section (s->output_section))
2292 struct bfd_elf_section_data *secdata;
2294 secdata = elf_section_data (s);
2295 if (! _bfd_merge_section (abfd,
2296 & hash_table->merge_info,
2297 s, &secdata->sec_info))
2299 else if (secdata->sec_info)
2300 secdata->sec_info_type = ELF_INFO_TYPE_MERGE;
2311 if (extversym != NULL)
2316 /* Create some sections which will be filled in with dynamic linking
2317 information. ABFD is an input file which requires dynamic sections
2318 to be created. The dynamic sections take up virtual memory space
2319 when the final executable is run, so we need to create them before
2320 addresses are assigned to the output sections. We work out the
2321 actual contents and size of these sections later. */
2324 elf_link_create_dynamic_sections (abfd, info)
2326 struct bfd_link_info *info;
2329 register asection *s;
2330 struct elf_link_hash_entry *h;
2331 struct elf_backend_data *bed;
2333 if (! is_elf_hash_table (info))
2336 if (elf_hash_table (info)->dynamic_sections_created)
2339 /* Make sure that all dynamic sections use the same input BFD. */
2340 if (elf_hash_table (info)->dynobj == NULL)
2341 elf_hash_table (info)->dynobj = abfd;
2343 abfd = elf_hash_table (info)->dynobj;
2345 /* Note that we set the SEC_IN_MEMORY flag for all of these
2347 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
2348 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2350 /* A dynamically linked executable has a .interp section, but a
2351 shared library does not. */
2354 s = bfd_make_section (abfd, ".interp");
2356 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2360 if (! info->traditional_format
2361 && info->hash->creator->flavour == bfd_target_elf_flavour)
2363 s = bfd_make_section (abfd, ".eh_frame_hdr");
2365 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2366 || ! bfd_set_section_alignment (abfd, s, 2))
2370 /* Create sections to hold version informations. These are removed
2371 if they are not needed. */
2372 s = bfd_make_section (abfd, ".gnu.version_d");
2374 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2375 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2378 s = bfd_make_section (abfd, ".gnu.version");
2380 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2381 || ! bfd_set_section_alignment (abfd, s, 1))
2384 s = bfd_make_section (abfd, ".gnu.version_r");
2386 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2387 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2390 s = bfd_make_section (abfd, ".dynsym");
2392 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2393 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2396 s = bfd_make_section (abfd, ".dynstr");
2398 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2401 /* Create a strtab to hold the dynamic symbol names. */
2402 if (elf_hash_table (info)->dynstr == NULL)
2404 elf_hash_table (info)->dynstr = _bfd_elf_strtab_init ();
2405 if (elf_hash_table (info)->dynstr == NULL)
2409 s = bfd_make_section (abfd, ".dynamic");
2411 || ! bfd_set_section_flags (abfd, s, flags)
2412 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2415 /* The special symbol _DYNAMIC is always set to the start of the
2416 .dynamic section. This call occurs before we have processed the
2417 symbols for any dynamic object, so we don't have to worry about
2418 overriding a dynamic definition. We could set _DYNAMIC in a
2419 linker script, but we only want to define it if we are, in fact,
2420 creating a .dynamic section. We don't want to define it if there
2421 is no .dynamic section, since on some ELF platforms the start up
2422 code examines it to decide how to initialize the process. */
2424 if (! (_bfd_generic_link_add_one_symbol
2425 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
2426 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
2427 (struct bfd_link_hash_entry **) &h)))
2429 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2430 h->type = STT_OBJECT;
2433 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
2436 bed = get_elf_backend_data (abfd);
2438 s = bfd_make_section (abfd, ".hash");
2440 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2441 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2443 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
2445 /* Let the backend create the rest of the sections. This lets the
2446 backend set the right flags. The backend will normally create
2447 the .got and .plt sections. */
2448 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
2451 elf_hash_table (info)->dynamic_sections_created = true;
2456 /* Add an entry to the .dynamic table. */
2459 elf_add_dynamic_entry (info, tag, val)
2460 struct bfd_link_info *info;
2464 Elf_Internal_Dyn dyn;
2467 bfd_size_type newsize;
2468 bfd_byte *newcontents;
2470 if (! is_elf_hash_table (info))
2473 dynobj = elf_hash_table (info)->dynobj;
2475 s = bfd_get_section_by_name (dynobj, ".dynamic");
2476 BFD_ASSERT (s != NULL);
2478 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
2479 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
2480 if (newcontents == NULL)
2484 dyn.d_un.d_val = val;
2485 elf_swap_dyn_out (dynobj, &dyn,
2486 (Elf_External_Dyn *) (newcontents + s->_raw_size));
2488 s->_raw_size = newsize;
2489 s->contents = newcontents;
2494 /* Record a new local dynamic symbol. */
2497 elf_link_record_local_dynamic_symbol (info, input_bfd, input_indx)
2498 struct bfd_link_info *info;
2502 struct elf_link_local_dynamic_entry *entry;
2503 struct elf_link_hash_table *eht;
2504 struct elf_strtab_hash *dynstr;
2505 Elf_External_Sym esym;
2506 Elf_External_Sym_Shndx eshndx;
2507 Elf_External_Sym_Shndx *shndx;
2508 unsigned long dynstr_index;
2513 if (! is_elf_hash_table (info))
2516 /* See if the entry exists already. */
2517 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
2518 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
2521 entry = (struct elf_link_local_dynamic_entry *)
2522 bfd_alloc (input_bfd, (bfd_size_type) sizeof (*entry));
2526 /* Go find the symbol, so that we can find it's name. */
2527 amt = sizeof (Elf_External_Sym);
2528 pos = elf_tdata (input_bfd)->symtab_hdr.sh_offset + input_indx * amt;
2529 if (bfd_seek (input_bfd, pos, SEEK_SET) != 0
2530 || bfd_bread ((PTR) &esym, amt, input_bfd) != amt)
2533 if (elf_tdata (input_bfd)->symtab_shndx_hdr.sh_size != 0)
2535 amt = sizeof (Elf_External_Sym_Shndx);
2536 pos = elf_tdata (input_bfd)->symtab_shndx_hdr.sh_offset;
2537 pos += input_indx * amt;
2539 if (bfd_seek (input_bfd, pos, SEEK_SET) != 0
2540 || bfd_bread ((PTR) shndx, amt, input_bfd) != amt)
2543 elf_swap_symbol_in (input_bfd, &esym, shndx, &entry->isym);
2545 name = (bfd_elf_string_from_elf_section
2546 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
2547 entry->isym.st_name));
2549 dynstr = elf_hash_table (info)->dynstr;
2552 /* Create a strtab to hold the dynamic symbol names. */
2553 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
2558 dynstr_index = _bfd_elf_strtab_add (dynstr, name, false);
2559 if (dynstr_index == (unsigned long) -1)
2561 entry->isym.st_name = dynstr_index;
2563 eht = elf_hash_table (info);
2565 entry->next = eht->dynlocal;
2566 eht->dynlocal = entry;
2567 entry->input_bfd = input_bfd;
2568 entry->input_indx = input_indx;
2571 /* Whatever binding the symbol had before, it's now local. */
2573 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
2575 /* The dynindx will be set at the end of size_dynamic_sections. */
2580 /* Read and swap the relocs from the section indicated by SHDR. This
2581 may be either a REL or a RELA section. The relocations are
2582 translated into RELA relocations and stored in INTERNAL_RELOCS,
2583 which should have already been allocated to contain enough space.
2584 The EXTERNAL_RELOCS are a buffer where the external form of the
2585 relocations should be stored.
2587 Returns false if something goes wrong. */
2590 elf_link_read_relocs_from_section (abfd, shdr, external_relocs,
2593 Elf_Internal_Shdr *shdr;
2594 PTR external_relocs;
2595 Elf_Internal_Rela *internal_relocs;
2597 struct elf_backend_data *bed;
2600 /* If there aren't any relocations, that's OK. */
2604 /* Position ourselves at the start of the section. */
2605 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2608 /* Read the relocations. */
2609 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2612 bed = get_elf_backend_data (abfd);
2614 /* Convert the external relocations to the internal format. */
2615 if (shdr->sh_entsize == sizeof (Elf_External_Rel))
2617 Elf_External_Rel *erel;
2618 Elf_External_Rel *erelend;
2619 Elf_Internal_Rela *irela;
2620 Elf_Internal_Rel *irel;
2622 erel = (Elf_External_Rel *) external_relocs;
2623 erelend = erel + NUM_SHDR_ENTRIES (shdr);
2624 irela = internal_relocs;
2625 amt = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
2626 irel = bfd_alloc (abfd, amt);
2627 for (; erel < erelend; erel++, irela += bed->s->int_rels_per_ext_rel)
2631 if (bed->s->swap_reloc_in)
2632 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
2634 elf_swap_reloc_in (abfd, erel, irel);
2636 for (i = 0; i < bed->s->int_rels_per_ext_rel; ++i)
2638 irela[i].r_offset = irel[i].r_offset;
2639 irela[i].r_info = irel[i].r_info;
2640 irela[i].r_addend = 0;
2646 Elf_External_Rela *erela;
2647 Elf_External_Rela *erelaend;
2648 Elf_Internal_Rela *irela;
2650 BFD_ASSERT (shdr->sh_entsize == sizeof (Elf_External_Rela));
2652 erela = (Elf_External_Rela *) external_relocs;
2653 erelaend = erela + NUM_SHDR_ENTRIES (shdr);
2654 irela = internal_relocs;
2655 for (; erela < erelaend; erela++, irela += bed->s->int_rels_per_ext_rel)
2657 if (bed->s->swap_reloca_in)
2658 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
2660 elf_swap_reloca_in (abfd, erela, irela);
2667 /* Read and swap the relocs for a section O. They may have been
2668 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2669 not NULL, they are used as buffers to read into. They are known to
2670 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2671 the return value is allocated using either malloc or bfd_alloc,
2672 according to the KEEP_MEMORY argument. If O has two relocation
2673 sections (both REL and RELA relocations), then the REL_HDR
2674 relocations will appear first in INTERNAL_RELOCS, followed by the
2675 REL_HDR2 relocations. */
2678 NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
2682 PTR external_relocs;
2683 Elf_Internal_Rela *internal_relocs;
2684 boolean keep_memory;
2686 Elf_Internal_Shdr *rel_hdr;
2688 Elf_Internal_Rela *alloc2 = NULL;
2689 struct elf_backend_data *bed = get_elf_backend_data (abfd);
2691 if (elf_section_data (o)->relocs != NULL)
2692 return elf_section_data (o)->relocs;
2694 if (o->reloc_count == 0)
2697 rel_hdr = &elf_section_data (o)->rel_hdr;
2699 if (internal_relocs == NULL)
2703 size = o->reloc_count;
2704 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2706 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2708 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2709 if (internal_relocs == NULL)
2713 if (external_relocs == NULL)
2715 bfd_size_type size = rel_hdr->sh_size;
2717 if (elf_section_data (o)->rel_hdr2)
2718 size += elf_section_data (o)->rel_hdr2->sh_size;
2719 alloc1 = (PTR) bfd_malloc (size);
2722 external_relocs = alloc1;
2725 if (!elf_link_read_relocs_from_section (abfd, rel_hdr,
2729 if (!elf_link_read_relocs_from_section
2731 elf_section_data (o)->rel_hdr2,
2732 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2733 internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
2734 * bed->s->int_rels_per_ext_rel)))
2737 /* Cache the results for next time, if we can. */
2739 elf_section_data (o)->relocs = internal_relocs;
2744 /* Don't free alloc2, since if it was allocated we are passing it
2745 back (under the name of internal_relocs). */
2747 return internal_relocs;
2757 /* Record an assignment to a symbol made by a linker script. We need
2758 this in case some dynamic object refers to this symbol. */
2761 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
2762 bfd *output_bfd ATTRIBUTE_UNUSED;
2763 struct bfd_link_info *info;
2767 struct elf_link_hash_entry *h;
2769 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2772 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
2776 if (h->root.type == bfd_link_hash_new)
2777 h->elf_link_hash_flags &= ~ELF_LINK_NON_ELF;
2779 /* If this symbol is being provided by the linker script, and it is
2780 currently defined by a dynamic object, but not by a regular
2781 object, then mark it as undefined so that the generic linker will
2782 force the correct value. */
2784 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2785 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2786 h->root.type = bfd_link_hash_undefined;
2788 /* If this symbol is not being provided by the linker script, and it is
2789 currently defined by a dynamic object, but not by a regular object,
2790 then clear out any version information because the symbol will not be
2791 associated with the dynamic object any more. */
2793 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2794 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2795 h->verinfo.verdef = NULL;
2797 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2799 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2800 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
2802 && h->dynindx == -1)
2804 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2807 /* If this is a weak defined symbol, and we know a corresponding
2808 real symbol from the same dynamic object, make sure the real
2809 symbol is also made into a dynamic symbol. */
2810 if (h->weakdef != NULL
2811 && h->weakdef->dynindx == -1)
2813 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2821 /* This structure is used to pass information to
2822 elf_link_assign_sym_version. */
2824 struct elf_assign_sym_version_info
2828 /* General link information. */
2829 struct bfd_link_info *info;
2831 struct bfd_elf_version_tree *verdefs;
2832 /* Whether we had a failure. */
2836 /* This structure is used to pass information to
2837 elf_link_find_version_dependencies. */
2839 struct elf_find_verdep_info
2843 /* General link information. */
2844 struct bfd_link_info *info;
2845 /* The number of dependencies. */
2847 /* Whether we had a failure. */
2851 /* Array used to determine the number of hash table buckets to use
2852 based on the number of symbols there are. If there are fewer than
2853 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2854 fewer than 37 we use 17 buckets, and so forth. We never use more
2855 than 32771 buckets. */
2857 static const size_t elf_buckets[] =
2859 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2863 /* Compute bucket count for hashing table. We do not use a static set
2864 of possible tables sizes anymore. Instead we determine for all
2865 possible reasonable sizes of the table the outcome (i.e., the
2866 number of collisions etc) and choose the best solution. The
2867 weighting functions are not too simple to allow the table to grow
2868 without bounds. Instead one of the weighting factors is the size.
2869 Therefore the result is always a good payoff between few collisions
2870 (= short chain lengths) and table size. */
2872 compute_bucket_count (info)
2873 struct bfd_link_info *info;
2875 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
2876 size_t best_size = 0;
2877 unsigned long int *hashcodes;
2878 unsigned long int *hashcodesp;
2879 unsigned long int i;
2882 /* Compute the hash values for all exported symbols. At the same
2883 time store the values in an array so that we could use them for
2886 amt *= sizeof (unsigned long int);
2887 hashcodes = (unsigned long int *) bfd_malloc (amt);
2888 if (hashcodes == NULL)
2890 hashcodesp = hashcodes;
2892 /* Put all hash values in HASHCODES. */
2893 elf_link_hash_traverse (elf_hash_table (info),
2894 elf_collect_hash_codes, &hashcodesp);
2896 /* We have a problem here. The following code to optimize the table
2897 size requires an integer type with more the 32 bits. If
2898 BFD_HOST_U_64_BIT is set we know about such a type. */
2899 #ifdef BFD_HOST_U_64_BIT
2900 if (info->optimize == true)
2902 unsigned long int nsyms = hashcodesp - hashcodes;
2905 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
2906 unsigned long int *counts ;
2908 /* Possible optimization parameters: if we have NSYMS symbols we say
2909 that the hashing table must at least have NSYMS/4 and at most
2911 minsize = nsyms / 4;
2914 best_size = maxsize = nsyms * 2;
2916 /* Create array where we count the collisions in. We must use bfd_malloc
2917 since the size could be large. */
2919 amt *= sizeof (unsigned long int);
2920 counts = (unsigned long int *) bfd_malloc (amt);
2927 /* Compute the "optimal" size for the hash table. The criteria is a
2928 minimal chain length. The minor criteria is (of course) the size
2930 for (i = minsize; i < maxsize; ++i)
2932 /* Walk through the array of hashcodes and count the collisions. */
2933 BFD_HOST_U_64_BIT max;
2934 unsigned long int j;
2935 unsigned long int fact;
2937 memset (counts, '\0', i * sizeof (unsigned long int));
2939 /* Determine how often each hash bucket is used. */
2940 for (j = 0; j < nsyms; ++j)
2941 ++counts[hashcodes[j] % i];
2943 /* For the weight function we need some information about the
2944 pagesize on the target. This is information need not be 100%
2945 accurate. Since this information is not available (so far) we
2946 define it here to a reasonable default value. If it is crucial
2947 to have a better value some day simply define this value. */
2948 # ifndef BFD_TARGET_PAGESIZE
2949 # define BFD_TARGET_PAGESIZE (4096)
2952 /* We in any case need 2 + NSYMS entries for the size values and
2954 max = (2 + nsyms) * (ARCH_SIZE / 8);
2957 /* Variant 1: optimize for short chains. We add the squares
2958 of all the chain lengths (which favous many small chain
2959 over a few long chains). */
2960 for (j = 0; j < i; ++j)
2961 max += counts[j] * counts[j];
2963 /* This adds penalties for the overall size of the table. */
2964 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2967 /* Variant 2: Optimize a lot more for small table. Here we
2968 also add squares of the size but we also add penalties for
2969 empty slots (the +1 term). */
2970 for (j = 0; j < i; ++j)
2971 max += (1 + counts[j]) * (1 + counts[j]);
2973 /* The overall size of the table is considered, but not as
2974 strong as in variant 1, where it is squared. */
2975 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2979 /* Compare with current best results. */
2980 if (max < best_chlen)
2990 #endif /* defined (BFD_HOST_U_64_BIT) */
2992 /* This is the fallback solution if no 64bit type is available or if we
2993 are not supposed to spend much time on optimizations. We select the
2994 bucket count using a fixed set of numbers. */
2995 for (i = 0; elf_buckets[i] != 0; i++)
2997 best_size = elf_buckets[i];
2998 if (dynsymcount < elf_buckets[i + 1])
3003 /* Free the arrays we needed. */
3009 /* Set up the sizes and contents of the ELF dynamic sections. This is
3010 called by the ELF linker emulation before_allocation routine. We
3011 must set the sizes of the sections before the linker sets the
3012 addresses of the various sections. */
3015 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
3017 auxiliary_filters, info, sinterpptr,
3022 const char *filter_shlib;
3023 const char * const *auxiliary_filters;
3024 struct bfd_link_info *info;
3025 asection **sinterpptr;
3026 struct bfd_elf_version_tree *verdefs;
3028 bfd_size_type soname_indx;
3030 struct elf_backend_data *bed;
3031 struct elf_assign_sym_version_info asvinfo;
3035 soname_indx = (bfd_size_type) -1;
3037 if (info->hash->creator->flavour != bfd_target_elf_flavour)
3040 if (! is_elf_hash_table (info))
3043 /* Any syms created from now on start with -1 in
3044 got.refcount/offset and plt.refcount/offset. */
3045 elf_hash_table (info)->init_refcount = -1;
3047 /* The backend may have to create some sections regardless of whether
3048 we're dynamic or not. */
3049 bed = get_elf_backend_data (output_bfd);
3050 if (bed->elf_backend_always_size_sections
3051 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
3054 dynobj = elf_hash_table (info)->dynobj;
3056 /* If there were no dynamic objects in the link, there is nothing to
3061 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
3064 if (elf_hash_table (info)->dynamic_sections_created)
3066 struct elf_info_failed eif;
3067 struct elf_link_hash_entry *h;
3070 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
3071 BFD_ASSERT (*sinterpptr != NULL || info->shared);
3075 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3077 if (soname_indx == (bfd_size_type) -1
3078 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SONAME,
3085 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMBOLIC,
3088 info->flags |= DF_SYMBOLIC;
3095 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
3097 if (info->new_dtags)
3098 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
3099 if (indx == (bfd_size_type) -1
3100 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_RPATH, indx)
3102 && ! elf_add_dynamic_entry (info, (bfd_vma) DT_RUNPATH,
3107 if (filter_shlib != NULL)
3111 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3112 filter_shlib, true);
3113 if (indx == (bfd_size_type) -1
3114 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_FILTER, indx))
3118 if (auxiliary_filters != NULL)
3120 const char * const *p;
3122 for (p = auxiliary_filters; *p != NULL; p++)
3126 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3128 if (indx == (bfd_size_type) -1
3129 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_AUXILIARY,
3136 eif.verdefs = verdefs;
3139 /* If we are supposed to export all symbols into the dynamic symbol
3140 table (this is not the normal case), then do so. */
3141 if (info->export_dynamic)
3143 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
3149 /* Attach all the symbols to their version information. */
3150 asvinfo.output_bfd = output_bfd;
3151 asvinfo.info = info;
3152 asvinfo.verdefs = verdefs;
3153 asvinfo.failed = false;
3155 elf_link_hash_traverse (elf_hash_table (info),
3156 elf_link_assign_sym_version,
3161 /* Find all symbols which were defined in a dynamic object and make
3162 the backend pick a reasonable value for them. */
3163 elf_link_hash_traverse (elf_hash_table (info),
3164 elf_adjust_dynamic_symbol,
3169 /* Add some entries to the .dynamic section. We fill in some of the
3170 values later, in elf_bfd_final_link, but we must add the entries
3171 now so that we know the final size of the .dynamic section. */
3173 /* If there are initialization and/or finalization functions to
3174 call then add the corresponding DT_INIT/DT_FINI entries. */
3175 h = (info->init_function
3176 ? elf_link_hash_lookup (elf_hash_table (info),
3177 info->init_function, false,
3181 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3182 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3184 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_INIT, (bfd_vma) 0))
3187 h = (info->fini_function
3188 ? elf_link_hash_lookup (elf_hash_table (info),
3189 info->fini_function, false,
3193 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3194 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3196 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FINI, (bfd_vma) 0))
3200 if (bfd_get_section_by_name (output_bfd, ".preinit_array") != NULL)
3202 /* DT_PREINIT_ARRAY is not allowed in shared library. */
3208 for (sub = info->input_bfds; sub != NULL;
3209 sub = sub->link_next)
3210 for (o = sub->sections; o != NULL; o = o->next)
3211 if (elf_section_data (o)->this_hdr.sh_type
3212 == SHT_PREINIT_ARRAY)
3214 (*_bfd_error_handler)
3215 (_("%s: .preinit_array section is not allowed in DSO"),
3216 bfd_archive_filename (sub));
3220 bfd_set_error (bfd_error_nonrepresentable_section);
3224 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_PREINIT_ARRAY,
3226 || !elf_add_dynamic_entry (info, (bfd_vma) DT_PREINIT_ARRAYSZ,
3230 if (bfd_get_section_by_name (output_bfd, ".init_array") != NULL)
3232 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_INIT_ARRAY,
3234 || !elf_add_dynamic_entry (info, (bfd_vma) DT_INIT_ARRAYSZ,
3238 if (bfd_get_section_by_name (output_bfd, ".fini_array") != NULL)
3240 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_FINI_ARRAY,
3242 || !elf_add_dynamic_entry (info, (bfd_vma) DT_FINI_ARRAYSZ,
3247 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
3248 /* If .dynstr is excluded from the link, we don't want any of
3249 these tags. Strictly, we should be checking each section
3250 individually; This quick check covers for the case where
3251 someone does a /DISCARD/ : { *(*) }. */
3252 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
3254 bfd_size_type strsize;
3256 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
3257 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_HASH, (bfd_vma) 0)
3258 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_STRTAB, (bfd_vma) 0)
3259 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMTAB, (bfd_vma) 0)
3260 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_STRSZ, strsize)
3261 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMENT,
3262 (bfd_vma) sizeof (Elf_External_Sym)))
3267 /* The backend must work out the sizes of all the other dynamic
3269 if (bed->elf_backend_size_dynamic_sections
3270 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
3273 if (elf_hash_table (info)->dynamic_sections_created)
3275 bfd_size_type dynsymcount;
3277 size_t bucketcount = 0;
3278 size_t hash_entry_size;
3279 unsigned int dtagcount;
3281 /* Set up the version definition section. */
3282 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3283 BFD_ASSERT (s != NULL);
3285 /* We may have created additional version definitions if we are
3286 just linking a regular application. */
3287 verdefs = asvinfo.verdefs;
3289 /* Skip anonymous version tag. */
3290 if (verdefs != NULL && verdefs->vernum == 0)
3291 verdefs = verdefs->next;
3293 if (verdefs == NULL)
3294 _bfd_strip_section_from_output (info, s);
3299 struct bfd_elf_version_tree *t;
3301 Elf_Internal_Verdef def;
3302 Elf_Internal_Verdaux defaux;
3307 /* Make space for the base version. */
3308 size += sizeof (Elf_External_Verdef);
3309 size += sizeof (Elf_External_Verdaux);
3312 for (t = verdefs; t != NULL; t = t->next)
3314 struct bfd_elf_version_deps *n;
3316 size += sizeof (Elf_External_Verdef);
3317 size += sizeof (Elf_External_Verdaux);
3320 for (n = t->deps; n != NULL; n = n->next)
3321 size += sizeof (Elf_External_Verdaux);
3324 s->_raw_size = size;
3325 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3326 if (s->contents == NULL && s->_raw_size != 0)
3329 /* Fill in the version definition section. */
3333 def.vd_version = VER_DEF_CURRENT;
3334 def.vd_flags = VER_FLG_BASE;
3337 def.vd_aux = sizeof (Elf_External_Verdef);
3338 def.vd_next = (sizeof (Elf_External_Verdef)
3339 + sizeof (Elf_External_Verdaux));
3341 if (soname_indx != (bfd_size_type) -1)
3343 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3345 def.vd_hash = bfd_elf_hash (soname);
3346 defaux.vda_name = soname_indx;
3353 name = basename (output_bfd->filename);
3354 def.vd_hash = bfd_elf_hash (name);
3355 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3357 if (indx == (bfd_size_type) -1)
3359 defaux.vda_name = indx;
3361 defaux.vda_next = 0;
3363 _bfd_elf_swap_verdef_out (output_bfd, &def,
3364 (Elf_External_Verdef *) p);
3365 p += sizeof (Elf_External_Verdef);
3366 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3367 (Elf_External_Verdaux *) p);
3368 p += sizeof (Elf_External_Verdaux);
3370 for (t = verdefs; t != NULL; t = t->next)
3373 struct bfd_elf_version_deps *n;
3374 struct elf_link_hash_entry *h;
3377 for (n = t->deps; n != NULL; n = n->next)
3380 /* Add a symbol representing this version. */
3382 if (! (_bfd_generic_link_add_one_symbol
3383 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
3384 (bfd_vma) 0, (const char *) NULL, false,
3385 get_elf_backend_data (dynobj)->collect,
3386 (struct bfd_link_hash_entry **) &h)))
3388 h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
3389 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3390 h->type = STT_OBJECT;
3391 h->verinfo.vertree = t;
3393 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
3396 def.vd_version = VER_DEF_CURRENT;
3398 if (t->globals == NULL && t->locals == NULL && ! t->used)
3399 def.vd_flags |= VER_FLG_WEAK;
3400 def.vd_ndx = t->vernum + 1;
3401 def.vd_cnt = cdeps + 1;
3402 def.vd_hash = bfd_elf_hash (t->name);
3403 def.vd_aux = sizeof (Elf_External_Verdef);
3404 if (t->next != NULL)
3405 def.vd_next = (sizeof (Elf_External_Verdef)
3406 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
3410 _bfd_elf_swap_verdef_out (output_bfd, &def,
3411 (Elf_External_Verdef *) p);
3412 p += sizeof (Elf_External_Verdef);
3414 defaux.vda_name = h->dynstr_index;
3415 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3417 if (t->deps == NULL)
3418 defaux.vda_next = 0;
3420 defaux.vda_next = sizeof (Elf_External_Verdaux);
3421 t->name_indx = defaux.vda_name;
3423 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3424 (Elf_External_Verdaux *) p);
3425 p += sizeof (Elf_External_Verdaux);
3427 for (n = t->deps; n != NULL; n = n->next)
3429 if (n->version_needed == NULL)
3431 /* This can happen if there was an error in the
3433 defaux.vda_name = 0;
3437 defaux.vda_name = n->version_needed->name_indx;
3438 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3441 if (n->next == NULL)
3442 defaux.vda_next = 0;
3444 defaux.vda_next = sizeof (Elf_External_Verdaux);
3446 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3447 (Elf_External_Verdaux *) p);
3448 p += sizeof (Elf_External_Verdaux);
3452 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERDEF, (bfd_vma) 0)
3453 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_VERDEFNUM,
3457 elf_tdata (output_bfd)->cverdefs = cdefs;
3460 if (info->new_dtags && info->flags)
3462 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FLAGS, info->flags))
3469 info->flags_1 &= ~ (DF_1_INITFIRST
3472 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FLAGS_1,
3477 /* Work out the size of the version reference section. */
3479 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3480 BFD_ASSERT (s != NULL);
3482 struct elf_find_verdep_info sinfo;
3484 sinfo.output_bfd = output_bfd;
3486 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
3487 if (sinfo.vers == 0)
3489 sinfo.failed = false;
3491 elf_link_hash_traverse (elf_hash_table (info),
3492 elf_link_find_version_dependencies,
3495 if (elf_tdata (output_bfd)->verref == NULL)
3496 _bfd_strip_section_from_output (info, s);
3499 Elf_Internal_Verneed *t;
3504 /* Build the version definition section. */
3507 for (t = elf_tdata (output_bfd)->verref;
3511 Elf_Internal_Vernaux *a;
3513 size += sizeof (Elf_External_Verneed);
3515 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3516 size += sizeof (Elf_External_Vernaux);
3519 s->_raw_size = size;
3520 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3521 if (s->contents == NULL)
3525 for (t = elf_tdata (output_bfd)->verref;
3530 Elf_Internal_Vernaux *a;
3534 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3537 t->vn_version = VER_NEED_CURRENT;
3539 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3540 elf_dt_name (t->vn_bfd) != NULL
3541 ? elf_dt_name (t->vn_bfd)
3542 : basename (t->vn_bfd->filename),
3544 if (indx == (bfd_size_type) -1)
3547 t->vn_aux = sizeof (Elf_External_Verneed);
3548 if (t->vn_nextref == NULL)
3551 t->vn_next = (sizeof (Elf_External_Verneed)
3552 + caux * sizeof (Elf_External_Vernaux));
3554 _bfd_elf_swap_verneed_out (output_bfd, t,
3555 (Elf_External_Verneed *) p);
3556 p += sizeof (Elf_External_Verneed);
3558 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3560 a->vna_hash = bfd_elf_hash (a->vna_nodename);
3561 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3562 a->vna_nodename, false);
3563 if (indx == (bfd_size_type) -1)
3566 if (a->vna_nextptr == NULL)
3569 a->vna_next = sizeof (Elf_External_Vernaux);
3571 _bfd_elf_swap_vernaux_out (output_bfd, a,
3572 (Elf_External_Vernaux *) p);
3573 p += sizeof (Elf_External_Vernaux);
3577 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERNEED,
3579 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_VERNEEDNUM,
3583 elf_tdata (output_bfd)->cverrefs = crefs;
3587 /* Assign dynsym indicies. In a shared library we generate a
3588 section symbol for each output section, which come first.
3589 Next come all of the back-end allocated local dynamic syms,
3590 followed by the rest of the global symbols. */
3592 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3594 /* Work out the size of the symbol version section. */
3595 s = bfd_get_section_by_name (dynobj, ".gnu.version");
3596 BFD_ASSERT (s != NULL);
3597 if (dynsymcount == 0
3598 || (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
3600 _bfd_strip_section_from_output (info, s);
3601 /* The DYNSYMCOUNT might have changed if we were going to
3602 output a dynamic symbol table entry for S. */
3603 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3607 s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
3608 s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3609 if (s->contents == NULL)
3612 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERSYM, (bfd_vma) 0))
3616 /* Set the size of the .dynsym and .hash sections. We counted
3617 the number of dynamic symbols in elf_link_add_object_symbols.
3618 We will build the contents of .dynsym and .hash when we build
3619 the final symbol table, because until then we do not know the
3620 correct value to give the symbols. We built the .dynstr
3621 section as we went along in elf_link_add_object_symbols. */
3622 s = bfd_get_section_by_name (dynobj, ".dynsym");
3623 BFD_ASSERT (s != NULL);
3624 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
3625 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3626 if (s->contents == NULL && s->_raw_size != 0)
3629 if (dynsymcount != 0)
3631 Elf_Internal_Sym isym;
3633 /* The first entry in .dynsym is a dummy symbol. */
3640 elf_swap_symbol_out (output_bfd, &isym, (PTR) s->contents, (PTR) 0);
3643 /* Compute the size of the hashing table. As a side effect this
3644 computes the hash values for all the names we export. */
3645 bucketcount = compute_bucket_count (info);
3647 s = bfd_get_section_by_name (dynobj, ".hash");
3648 BFD_ASSERT (s != NULL);
3649 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
3650 s->_raw_size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
3651 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3652 if (s->contents == NULL)
3654 memset (s->contents, 0, (size_t) s->_raw_size);
3656 bfd_put (8 * hash_entry_size, output_bfd, (bfd_vma) bucketcount,
3658 bfd_put (8 * hash_entry_size, output_bfd, (bfd_vma) dynsymcount,
3659 s->contents + hash_entry_size);
3661 elf_hash_table (info)->bucketcount = bucketcount;
3663 s = bfd_get_section_by_name (dynobj, ".dynstr");
3664 BFD_ASSERT (s != NULL);
3666 elf_finalize_dynstr (output_bfd, info);
3668 s->_raw_size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
3670 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
3671 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NULL, (bfd_vma) 0))
3678 /* This function is used to adjust offsets into .dynstr for
3679 dynamic symbols. This is called via elf_link_hash_traverse. */
3681 static boolean elf_adjust_dynstr_offsets
3682 PARAMS ((struct elf_link_hash_entry *, PTR));
3685 elf_adjust_dynstr_offsets (h, data)
3686 struct elf_link_hash_entry *h;
3689 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3691 if (h->root.type == bfd_link_hash_warning)
3692 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3694 if (h->dynindx != -1)
3695 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3699 /* Assign string offsets in .dynstr, update all structures referencing
3703 elf_finalize_dynstr (output_bfd, info)
3705 struct bfd_link_info *info;
3707 struct elf_link_local_dynamic_entry *entry;
3708 struct elf_strtab_hash *dynstr = elf_hash_table (info)->dynstr;
3709 bfd *dynobj = elf_hash_table (info)->dynobj;
3712 Elf_External_Dyn *dyncon, *dynconend;
3714 _bfd_elf_strtab_finalize (dynstr);
3715 size = _bfd_elf_strtab_size (dynstr);
3717 /* Update all .dynamic entries referencing .dynstr strings. */
3718 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3719 BFD_ASSERT (sdyn != NULL);
3721 dyncon = (Elf_External_Dyn *) sdyn->contents;
3722 dynconend = (Elf_External_Dyn *) (sdyn->contents +
3724 for (; dyncon < dynconend; dyncon++)
3726 Elf_Internal_Dyn dyn;
3728 elf_swap_dyn_in (dynobj, dyncon, & dyn);
3732 dyn.d_un.d_val = size;
3733 elf_swap_dyn_out (dynobj, & dyn, dyncon);
3741 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3742 elf_swap_dyn_out (dynobj, & dyn, dyncon);
3749 /* Now update local dynamic symbols. */
3750 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
3751 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3752 entry->isym.st_name);
3754 /* And the rest of dynamic symbols. */
3755 elf_link_hash_traverse (elf_hash_table (info),
3756 elf_adjust_dynstr_offsets, dynstr);
3758 /* Adjust version definitions. */
3759 if (elf_tdata (output_bfd)->cverdefs)
3764 Elf_Internal_Verdef def;
3765 Elf_Internal_Verdaux defaux;
3767 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3768 p = (bfd_byte *) s->contents;
3771 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3773 p += sizeof (Elf_External_Verdef);
3774 for (i = 0; i < def.vd_cnt; ++i)
3776 _bfd_elf_swap_verdaux_in (output_bfd,
3777 (Elf_External_Verdaux *) p, &defaux);
3778 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3780 _bfd_elf_swap_verdaux_out (output_bfd,
3781 &defaux, (Elf_External_Verdaux *) p);
3782 p += sizeof (Elf_External_Verdaux);
3785 while (def.vd_next);
3788 /* Adjust version references. */
3789 if (elf_tdata (output_bfd)->verref)
3794 Elf_Internal_Verneed need;
3795 Elf_Internal_Vernaux needaux;
3797 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3798 p = (bfd_byte *) s->contents;
3801 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3803 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3804 _bfd_elf_swap_verneed_out (output_bfd, &need,
3805 (Elf_External_Verneed *) p);
3806 p += sizeof (Elf_External_Verneed);
3807 for (i = 0; i < need.vn_cnt; ++i)
3809 _bfd_elf_swap_vernaux_in (output_bfd,
3810 (Elf_External_Vernaux *) p, &needaux);
3811 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3813 _bfd_elf_swap_vernaux_out (output_bfd,
3815 (Elf_External_Vernaux *) p);
3816 p += sizeof (Elf_External_Vernaux);
3819 while (need.vn_next);
3825 /* Fix up the flags for a symbol. This handles various cases which
3826 can only be fixed after all the input files are seen. This is
3827 currently called by both adjust_dynamic_symbol and
3828 assign_sym_version, which is unnecessary but perhaps more robust in
3829 the face of future changes. */
3832 elf_fix_symbol_flags (h, eif)
3833 struct elf_link_hash_entry *h;
3834 struct elf_info_failed *eif;
3836 /* If this symbol was mentioned in a non-ELF file, try to set
3837 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3838 permit a non-ELF file to correctly refer to a symbol defined in
3839 an ELF dynamic object. */
3840 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
3842 while (h->root.type == bfd_link_hash_indirect)
3843 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3845 if (h->root.type != bfd_link_hash_defined
3846 && h->root.type != bfd_link_hash_defweak)
3847 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3848 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3851 if (h->root.u.def.section->owner != NULL
3852 && (bfd_get_flavour (h->root.u.def.section->owner)
3853 == bfd_target_elf_flavour))
3854 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3855 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3857 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3860 if (h->dynindx == -1
3861 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3862 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
3864 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3873 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3874 was first seen in a non-ELF file. Fortunately, if the symbol
3875 was first seen in an ELF file, we're probably OK unless the
3876 symbol was defined in a non-ELF file. Catch that case here.
3877 FIXME: We're still in trouble if the symbol was first seen in
3878 a dynamic object, and then later in a non-ELF regular object. */
3879 if ((h->root.type == bfd_link_hash_defined
3880 || h->root.type == bfd_link_hash_defweak)
3881 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3882 && (h->root.u.def.section->owner != NULL
3883 ? (bfd_get_flavour (h->root.u.def.section->owner)
3884 != bfd_target_elf_flavour)
3885 : (bfd_is_abs_section (h->root.u.def.section)
3886 && (h->elf_link_hash_flags
3887 & ELF_LINK_HASH_DEF_DYNAMIC) == 0)))
3888 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3891 /* If this is a final link, and the symbol was defined as a common
3892 symbol in a regular object file, and there was no definition in
3893 any dynamic object, then the linker will have allocated space for
3894 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3895 flag will not have been set. */
3896 if (h->root.type == bfd_link_hash_defined
3897 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3898 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
3899 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3900 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
3901 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3903 /* If -Bsymbolic was used (which means to bind references to global
3904 symbols to the definition within the shared object), and this
3905 symbol was defined in a regular object, then it actually doesn't
3906 need a PLT entry, and we can accomplish that by forcing it local.
3907 Likewise, if the symbol has hidden or internal visibility.
3908 FIXME: It might be that we also do not need a PLT for other
3909 non-hidden visibilities, but we would have to tell that to the
3910 backend specifically; we can't just clear PLT-related data here. */
3911 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
3912 && eif->info->shared
3913 && is_elf_hash_table (eif->info)
3914 && (eif->info->symbolic
3915 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3916 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
3917 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3919 struct elf_backend_data *bed;
3920 boolean force_local;
3922 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3924 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3925 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
3926 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
3929 /* If this is a weak defined symbol in a dynamic object, and we know
3930 the real definition in the dynamic object, copy interesting flags
3931 over to the real definition. */
3932 if (h->weakdef != NULL)
3934 struct elf_link_hash_entry *weakdef;
3936 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3937 || h->root.type == bfd_link_hash_defweak);
3938 weakdef = h->weakdef;
3939 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
3940 || weakdef->root.type == bfd_link_hash_defweak);
3941 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
3943 /* If the real definition is defined by a regular object file,
3944 don't do anything special. See the longer description in
3945 elf_adjust_dynamic_symbol, below. */
3946 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3950 struct elf_backend_data *bed;
3952 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3953 (*bed->elf_backend_copy_indirect_symbol) (weakdef, h);
3960 /* Make the backend pick a good value for a dynamic symbol. This is
3961 called via elf_link_hash_traverse, and also calls itself
3965 elf_adjust_dynamic_symbol (h, data)
3966 struct elf_link_hash_entry *h;
3969 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3971 struct elf_backend_data *bed;
3973 if (h->root.type == bfd_link_hash_warning)
3975 h->plt.offset = (bfd_vma) -1;
3976 h->got.offset = (bfd_vma) -1;
3978 /* When warning symbols are created, they **replace** the "real"
3979 entry in the hash table, thus we never get to see the real
3980 symbol in a hash traversal. So look at it now. */
3981 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3984 /* Ignore indirect symbols. These are added by the versioning code. */
3985 if (h->root.type == bfd_link_hash_indirect)
3988 if (! is_elf_hash_table (eif->info))
3991 /* Fix the symbol flags. */
3992 if (! elf_fix_symbol_flags (h, eif))
3995 /* If this symbol does not require a PLT entry, and it is not
3996 defined by a dynamic object, or is not referenced by a regular
3997 object, ignore it. We do have to handle a weak defined symbol,
3998 even if no regular object refers to it, if we decided to add it
3999 to the dynamic symbol table. FIXME: Do we normally need to worry
4000 about symbols which are defined by one dynamic object and
4001 referenced by another one? */
4002 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
4003 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
4004 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
4005 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
4006 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
4008 h->plt.offset = (bfd_vma) -1;
4012 /* If we've already adjusted this symbol, don't do it again. This
4013 can happen via a recursive call. */
4014 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
4017 /* Don't look at this symbol again. Note that we must set this
4018 after checking the above conditions, because we may look at a
4019 symbol once, decide not to do anything, and then get called
4020 recursively later after REF_REGULAR is set below. */
4021 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
4023 /* If this is a weak definition, and we know a real definition, and
4024 the real symbol is not itself defined by a regular object file,
4025 then get a good value for the real definition. We handle the
4026 real symbol first, for the convenience of the backend routine.
4028 Note that there is a confusing case here. If the real definition
4029 is defined by a regular object file, we don't get the real symbol
4030 from the dynamic object, but we do get the weak symbol. If the
4031 processor backend uses a COPY reloc, then if some routine in the
4032 dynamic object changes the real symbol, we will not see that
4033 change in the corresponding weak symbol. This is the way other
4034 ELF linkers work as well, and seems to be a result of the shared
4037 I will clarify this issue. Most SVR4 shared libraries define the
4038 variable _timezone and define timezone as a weak synonym. The
4039 tzset call changes _timezone. If you write
4040 extern int timezone;
4042 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
4043 you might expect that, since timezone is a synonym for _timezone,
4044 the same number will print both times. However, if the processor
4045 backend uses a COPY reloc, then actually timezone will be copied
4046 into your process image, and, since you define _timezone
4047 yourself, _timezone will not. Thus timezone and _timezone will
4048 wind up at different memory locations. The tzset call will set
4049 _timezone, leaving timezone unchanged. */
4051 if (h->weakdef != NULL)
4053 /* If we get to this point, we know there is an implicit
4054 reference by a regular object file via the weak symbol H.
4055 FIXME: Is this really true? What if the traversal finds
4056 H->WEAKDEF before it finds H? */
4057 h->weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
4059 if (! elf_adjust_dynamic_symbol (h->weakdef, (PTR) eif))
4063 /* If a symbol has no type and no size and does not require a PLT
4064 entry, then we are probably about to do the wrong thing here: we
4065 are probably going to create a COPY reloc for an empty object.
4066 This case can arise when a shared object is built with assembly
4067 code, and the assembly code fails to set the symbol type. */
4069 && h->type == STT_NOTYPE
4070 && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0)
4071 (*_bfd_error_handler)
4072 (_("warning: type and size of dynamic symbol `%s' are not defined"),
4073 h->root.root.string);
4075 dynobj = elf_hash_table (eif->info)->dynobj;
4076 bed = get_elf_backend_data (dynobj);
4077 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
4086 /* This routine is used to export all defined symbols into the dynamic
4087 symbol table. It is called via elf_link_hash_traverse. */
4090 elf_export_symbol (h, data)
4091 struct elf_link_hash_entry *h;
4094 struct elf_info_failed *eif = (struct elf_info_failed *) data;
4096 /* Ignore indirect symbols. These are added by the versioning code. */
4097 if (h->root.type == bfd_link_hash_indirect)
4100 if (h->root.type == bfd_link_hash_warning)
4101 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4103 if (h->dynindx == -1
4104 && (h->elf_link_hash_flags
4105 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
4107 struct bfd_elf_version_tree *t;
4108 struct bfd_elf_version_expr *d;
4110 for (t = eif->verdefs; t != NULL; t = t->next)
4112 if (t->globals != NULL)
4114 for (d = t->globals; d != NULL; d = d->next)
4116 if ((*d->match) (d, h->root.root.string))
4121 if (t->locals != NULL)
4123 for (d = t->locals ; d != NULL; d = d->next)
4125 if ((*d->match) (d, h->root.root.string))
4134 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
4145 /* Look through the symbols which are defined in other shared
4146 libraries and referenced here. Update the list of version
4147 dependencies. This will be put into the .gnu.version_r section.
4148 This function is called via elf_link_hash_traverse. */
4151 elf_link_find_version_dependencies (h, data)
4152 struct elf_link_hash_entry *h;
4155 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
4156 Elf_Internal_Verneed *t;
4157 Elf_Internal_Vernaux *a;
4160 if (h->root.type == bfd_link_hash_warning)
4161 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4163 /* We only care about symbols defined in shared objects with version
4165 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
4166 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
4168 || h->verinfo.verdef == NULL)
4171 /* See if we already know about this version. */
4172 for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
4174 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
4177 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4178 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
4184 /* This is a new version. Add it to tree we are building. */
4189 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, amt);
4192 rinfo->failed = true;
4196 t->vn_bfd = h->verinfo.verdef->vd_bfd;
4197 t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
4198 elf_tdata (rinfo->output_bfd)->verref = t;
4202 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, amt);
4204 /* Note that we are copying a string pointer here, and testing it
4205 above. If bfd_elf_string_from_elf_section is ever changed to
4206 discard the string data when low in memory, this will have to be
4208 a->vna_nodename = h->verinfo.verdef->vd_nodename;
4210 a->vna_flags = h->verinfo.verdef->vd_flags;
4211 a->vna_nextptr = t->vn_auxptr;
4213 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
4216 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
4223 /* Figure out appropriate versions for all the symbols. We may not
4224 have the version number script until we have read all of the input
4225 files, so until that point we don't know which symbols should be
4226 local. This function is called via elf_link_hash_traverse. */
4229 elf_link_assign_sym_version (h, data)
4230 struct elf_link_hash_entry *h;
4233 struct elf_assign_sym_version_info *sinfo;
4234 struct bfd_link_info *info;
4235 struct elf_backend_data *bed;
4236 struct elf_info_failed eif;
4240 sinfo = (struct elf_assign_sym_version_info *) data;
4243 if (h->root.type == bfd_link_hash_warning)
4244 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4246 /* Fix the symbol flags. */
4249 if (! elf_fix_symbol_flags (h, &eif))
4252 sinfo->failed = true;
4256 /* We only need version numbers for symbols defined in regular
4258 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
4261 bed = get_elf_backend_data (sinfo->output_bfd);
4262 p = strchr (h->root.root.string, ELF_VER_CHR);
4263 if (p != NULL && h->verinfo.vertree == NULL)
4265 struct bfd_elf_version_tree *t;
4270 /* There are two consecutive ELF_VER_CHR characters if this is
4271 not a hidden symbol. */
4273 if (*p == ELF_VER_CHR)
4279 /* If there is no version string, we can just return out. */
4283 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
4287 /* Look for the version. If we find it, it is no longer weak. */
4288 for (t = sinfo->verdefs; t != NULL; t = t->next)
4290 if (strcmp (t->name, p) == 0)
4294 struct bfd_elf_version_expr *d;
4296 len = p - h->root.root.string;
4297 alc = bfd_malloc ((bfd_size_type) len);
4300 strncpy (alc, h->root.root.string, len - 1);
4301 alc[len - 1] = '\0';
4302 if (alc[len - 2] == ELF_VER_CHR)
4303 alc[len - 2] = '\0';
4305 h->verinfo.vertree = t;
4309 if (t->globals != NULL)
4311 for (d = t->globals; d != NULL; d = d->next)
4312 if ((*d->match) (d, alc))
4316 /* See if there is anything to force this symbol to
4318 if (d == NULL && t->locals != NULL)
4320 for (d = t->locals; d != NULL; d = d->next)
4322 if ((*d->match) (d, alc))
4324 if (h->dynindx != -1
4326 && ! info->export_dynamic)
4328 (*bed->elf_backend_hide_symbol) (info, h, true);
4341 /* If we are building an application, we need to create a
4342 version node for this version. */
4343 if (t == NULL && ! info->shared)
4345 struct bfd_elf_version_tree **pp;
4348 /* If we aren't going to export this symbol, we don't need
4349 to worry about it. */
4350 if (h->dynindx == -1)
4354 t = ((struct bfd_elf_version_tree *)
4355 bfd_alloc (sinfo->output_bfd, amt));
4358 sinfo->failed = true;
4367 t->name_indx = (unsigned int) -1;
4371 /* Don't count anonymous version tag. */
4372 if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0)
4374 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
4376 t->vernum = version_index;
4380 h->verinfo.vertree = t;
4384 /* We could not find the version for a symbol when
4385 generating a shared archive. Return an error. */
4386 (*_bfd_error_handler)
4387 (_("%s: undefined versioned symbol name %s"),
4388 bfd_get_filename (sinfo->output_bfd), h->root.root.string);
4389 bfd_set_error (bfd_error_bad_value);
4390 sinfo->failed = true;
4395 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
4398 /* If we don't have a version for this symbol, see if we can find
4400 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
4402 struct bfd_elf_version_tree *t;
4403 struct bfd_elf_version_tree *deflt;
4404 struct bfd_elf_version_expr *d;
4406 /* See if can find what version this symbol is in. If the
4407 symbol is supposed to be local, then don't actually register
4410 for (t = sinfo->verdefs; t != NULL; t = t->next)
4412 if (t->globals != NULL)
4414 for (d = t->globals; d != NULL; d = d->next)
4416 if ((*d->match) (d, h->root.root.string))
4418 h->verinfo.vertree = t;
4427 if (t->locals != NULL)
4429 for (d = t->locals; d != NULL; d = d->next)
4431 if (d->pattern[0] == '*' && d->pattern[1] == '\0')
4433 else if ((*d->match) (d, h->root.root.string))
4435 h->verinfo.vertree = t;
4436 if (h->dynindx != -1
4438 && ! info->export_dynamic)
4440 (*bed->elf_backend_hide_symbol) (info, h, true);
4451 if (deflt != NULL && h->verinfo.vertree == NULL)
4453 h->verinfo.vertree = deflt;
4454 if (h->dynindx != -1
4456 && ! info->export_dynamic)
4458 (*bed->elf_backend_hide_symbol) (info, h, true);
4466 /* Final phase of ELF linker. */
4468 /* A structure we use to avoid passing large numbers of arguments. */
4470 struct elf_final_link_info
4472 /* General link information. */
4473 struct bfd_link_info *info;
4476 /* Symbol string table. */
4477 struct bfd_strtab_hash *symstrtab;
4478 /* .dynsym section. */
4479 asection *dynsym_sec;
4480 /* .hash section. */
4482 /* symbol version section (.gnu.version). */
4483 asection *symver_sec;
4484 /* Buffer large enough to hold contents of any section. */
4486 /* Buffer large enough to hold external relocs of any section. */
4487 PTR external_relocs;
4488 /* Buffer large enough to hold internal relocs of any section. */
4489 Elf_Internal_Rela *internal_relocs;
4490 /* Buffer large enough to hold external local symbols of any input
4492 Elf_External_Sym *external_syms;
4493 /* And a buffer for symbol section indices. */
4494 Elf_External_Sym_Shndx *locsym_shndx;
4495 /* Buffer large enough to hold internal local symbols of any input
4497 Elf_Internal_Sym *internal_syms;
4498 /* Array large enough to hold a symbol index for each local symbol
4499 of any input BFD. */
4501 /* Array large enough to hold a section pointer for each local
4502 symbol of any input BFD. */
4503 asection **sections;
4504 /* Buffer to hold swapped out symbols. */
4505 Elf_External_Sym *symbuf;
4506 /* And one for symbol section indices. */
4507 Elf_External_Sym_Shndx *symshndxbuf;
4508 /* Number of swapped out symbols in buffer. */
4509 size_t symbuf_count;
4510 /* Number of symbols which fit in symbuf. */
4514 static boolean elf_link_output_sym
4515 PARAMS ((struct elf_final_link_info *, const char *,
4516 Elf_Internal_Sym *, asection *));
4517 static boolean elf_link_flush_output_syms
4518 PARAMS ((struct elf_final_link_info *));
4519 static boolean elf_link_output_extsym
4520 PARAMS ((struct elf_link_hash_entry *, PTR));
4521 static boolean elf_link_sec_merge_syms
4522 PARAMS ((struct elf_link_hash_entry *, PTR));
4523 static boolean elf_link_input_bfd
4524 PARAMS ((struct elf_final_link_info *, bfd *));
4525 static boolean elf_reloc_link_order
4526 PARAMS ((bfd *, struct bfd_link_info *, asection *,
4527 struct bfd_link_order *));
4529 /* This struct is used to pass information to elf_link_output_extsym. */
4531 struct elf_outext_info
4535 struct elf_final_link_info *finfo;
4538 /* Compute the size of, and allocate space for, REL_HDR which is the
4539 section header for a section containing relocations for O. */
4542 elf_link_size_reloc_section (abfd, rel_hdr, o)
4544 Elf_Internal_Shdr *rel_hdr;
4547 bfd_size_type reloc_count;
4548 bfd_size_type num_rel_hashes;
4550 /* Figure out how many relocations there will be. */
4551 if (rel_hdr == &elf_section_data (o)->rel_hdr)
4552 reloc_count = elf_section_data (o)->rel_count;
4554 reloc_count = elf_section_data (o)->rel_count2;
4556 num_rel_hashes = o->reloc_count;
4557 if (num_rel_hashes < reloc_count)
4558 num_rel_hashes = reloc_count;
4560 /* That allows us to calculate the size of the section. */
4561 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
4563 /* The contents field must last into write_object_contents, so we
4564 allocate it with bfd_alloc rather than malloc. Also since we
4565 cannot be sure that the contents will actually be filled in,
4566 we zero the allocated space. */
4567 rel_hdr->contents = (PTR) bfd_zalloc (abfd, rel_hdr->sh_size);
4568 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
4571 /* We only allocate one set of hash entries, so we only do it the
4572 first time we are called. */
4573 if (elf_section_data (o)->rel_hashes == NULL
4576 struct elf_link_hash_entry **p;
4578 p = ((struct elf_link_hash_entry **)
4579 bfd_zmalloc (num_rel_hashes
4580 * sizeof (struct elf_link_hash_entry *)));
4584 elf_section_data (o)->rel_hashes = p;
4590 /* When performing a relocateable link, the input relocations are
4591 preserved. But, if they reference global symbols, the indices
4592 referenced must be updated. Update all the relocations in
4593 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4596 elf_link_adjust_relocs (abfd, rel_hdr, count, rel_hash)
4598 Elf_Internal_Shdr *rel_hdr;
4600 struct elf_link_hash_entry **rel_hash;
4603 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4604 Elf_Internal_Rel *irel;
4605 Elf_Internal_Rela *irela;
4606 bfd_size_type amt = sizeof (Elf_Internal_Rel) * bed->s->int_rels_per_ext_rel;
4608 irel = (Elf_Internal_Rel *) bfd_zmalloc (amt);
4611 (*_bfd_error_handler) (_("Error: out of memory"));
4615 amt = sizeof (Elf_Internal_Rela) * bed->s->int_rels_per_ext_rel;
4616 irela = (Elf_Internal_Rela *) bfd_zmalloc (amt);
4619 (*_bfd_error_handler) (_("Error: out of memory"));
4623 for (i = 0; i < count; i++, rel_hash++)
4625 if (*rel_hash == NULL)
4628 BFD_ASSERT ((*rel_hash)->indx >= 0);
4630 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
4632 Elf_External_Rel *erel;
4635 erel = (Elf_External_Rel *) rel_hdr->contents + i;
4636 if (bed->s->swap_reloc_in)
4637 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
4639 elf_swap_reloc_in (abfd, erel, irel);
4641 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4642 irel[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4643 ELF_R_TYPE (irel[j].r_info));
4645 if (bed->s->swap_reloc_out)
4646 (*bed->s->swap_reloc_out) (abfd, irel, (bfd_byte *) erel);
4648 elf_swap_reloc_out (abfd, irel, erel);
4652 Elf_External_Rela *erela;
4655 BFD_ASSERT (rel_hdr->sh_entsize
4656 == sizeof (Elf_External_Rela));
4658 erela = (Elf_External_Rela *) rel_hdr->contents + i;
4659 if (bed->s->swap_reloca_in)
4660 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
4662 elf_swap_reloca_in (abfd, erela, irela);
4664 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4665 irela[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4666 ELF_R_TYPE (irela[j].r_info));
4668 if (bed->s->swap_reloca_out)
4669 (*bed->s->swap_reloca_out) (abfd, irela, (bfd_byte *) erela);
4671 elf_swap_reloca_out (abfd, irela, erela);
4679 struct elf_link_sort_rela {
4681 enum elf_reloc_type_class type;
4683 Elf_Internal_Rel rel;
4684 Elf_Internal_Rela rela;
4689 elf_link_sort_cmp1 (A, B)
4693 struct elf_link_sort_rela *a = (struct elf_link_sort_rela *) A;
4694 struct elf_link_sort_rela *b = (struct elf_link_sort_rela *) B;
4695 int relativea, relativeb;
4697 relativea = a->type == reloc_class_relative;
4698 relativeb = b->type == reloc_class_relative;
4700 if (relativea < relativeb)
4702 if (relativea > relativeb)
4704 if (ELF_R_SYM (a->u.rel.r_info) < ELF_R_SYM (b->u.rel.r_info))
4706 if (ELF_R_SYM (a->u.rel.r_info) > ELF_R_SYM (b->u.rel.r_info))
4708 if (a->u.rel.r_offset < b->u.rel.r_offset)
4710 if (a->u.rel.r_offset > b->u.rel.r_offset)
4716 elf_link_sort_cmp2 (A, B)
4720 struct elf_link_sort_rela *a = (struct elf_link_sort_rela *) A;
4721 struct elf_link_sort_rela *b = (struct elf_link_sort_rela *) B;
4724 if (a->offset < b->offset)
4726 if (a->offset > b->offset)
4728 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
4729 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
4734 if (a->u.rel.r_offset < b->u.rel.r_offset)
4736 if (a->u.rel.r_offset > b->u.rel.r_offset)
4742 elf_link_sort_relocs (abfd, info, psec)
4744 struct bfd_link_info *info;
4747 bfd *dynobj = elf_hash_table (info)->dynobj;
4748 asection *reldyn, *o;
4749 boolean rel = false;
4750 bfd_size_type count, size;
4752 struct elf_link_sort_rela *rela;
4753 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4755 reldyn = bfd_get_section_by_name (abfd, ".rela.dyn");
4756 if (reldyn == NULL || reldyn->_raw_size == 0)
4758 reldyn = bfd_get_section_by_name (abfd, ".rel.dyn");
4759 if (reldyn == NULL || reldyn->_raw_size == 0)
4762 count = reldyn->_raw_size / sizeof (Elf_External_Rel);
4765 count = reldyn->_raw_size / sizeof (Elf_External_Rela);
4768 for (o = dynobj->sections; o != NULL; o = o->next)
4769 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4770 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4771 && o->output_section == reldyn)
4772 size += o->_raw_size;
4774 if (size != reldyn->_raw_size)
4777 rela = (struct elf_link_sort_rela *) bfd_zmalloc (sizeof (*rela) * count);
4780 (*info->callbacks->warning)
4781 (info, _("Not enough memory to sort relocations"), 0, abfd, 0,
4786 for (o = dynobj->sections; o != NULL; o = o->next)
4787 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4788 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4789 && o->output_section == reldyn)
4793 Elf_External_Rel *erel, *erelend;
4794 struct elf_link_sort_rela *s;
4796 erel = (Elf_External_Rel *) o->contents;
4797 erelend = (Elf_External_Rel *) (o->contents + o->_raw_size);
4798 s = rela + o->output_offset / sizeof (Elf_External_Rel);
4799 for (; erel < erelend; erel++, s++)
4801 if (bed->s->swap_reloc_in)
4802 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, &s->u.rel);
4804 elf_swap_reloc_in (abfd, erel, &s->u.rel);
4806 s->type = (*bed->elf_backend_reloc_type_class) (&s->u.rela);
4811 Elf_External_Rela *erela, *erelaend;
4812 struct elf_link_sort_rela *s;
4814 erela = (Elf_External_Rela *) o->contents;
4815 erelaend = (Elf_External_Rela *) (o->contents + o->_raw_size);
4816 s = rela + o->output_offset / sizeof (Elf_External_Rela);
4817 for (; erela < erelaend; erela++, s++)
4819 if (bed->s->swap_reloca_in)
4820 (*bed->s->swap_reloca_in) (dynobj, (bfd_byte *) erela,
4823 elf_swap_reloca_in (dynobj, erela, &s->u.rela);
4825 s->type = (*bed->elf_backend_reloc_type_class) (&s->u.rela);
4830 qsort (rela, (size_t) count, sizeof (*rela), elf_link_sort_cmp1);
4831 for (ret = 0; ret < count && rela[ret].type == reloc_class_relative; ret++)
4833 for (i = ret, j = ret; i < count; i++)
4835 if (ELF_R_SYM (rela[i].u.rel.r_info) != ELF_R_SYM (rela[j].u.rel.r_info))
4837 rela[i].offset = rela[j].u.rel.r_offset;
4839 qsort (rela + ret, (size_t) count - ret, sizeof (*rela), elf_link_sort_cmp2);
4841 for (o = dynobj->sections; o != NULL; o = o->next)
4842 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4843 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4844 && o->output_section == reldyn)
4848 Elf_External_Rel *erel, *erelend;
4849 struct elf_link_sort_rela *s;
4851 erel = (Elf_External_Rel *) o->contents;
4852 erelend = (Elf_External_Rel *) (o->contents + o->_raw_size);
4853 s = rela + o->output_offset / sizeof (Elf_External_Rel);
4854 for (; erel < erelend; erel++, s++)
4856 if (bed->s->swap_reloc_out)
4857 (*bed->s->swap_reloc_out) (abfd, &s->u.rel,
4860 elf_swap_reloc_out (abfd, &s->u.rel, erel);
4865 Elf_External_Rela *erela, *erelaend;
4866 struct elf_link_sort_rela *s;
4868 erela = (Elf_External_Rela *) o->contents;
4869 erelaend = (Elf_External_Rela *) (o->contents + o->_raw_size);
4870 s = rela + o->output_offset / sizeof (Elf_External_Rela);
4871 for (; erela < erelaend; erela++, s++)
4873 if (bed->s->swap_reloca_out)
4874 (*bed->s->swap_reloca_out) (dynobj, &s->u.rela,
4875 (bfd_byte *) erela);
4877 elf_swap_reloca_out (dynobj, &s->u.rela, erela);
4887 /* Do the final step of an ELF link. */
4890 elf_bfd_final_link (abfd, info)
4892 struct bfd_link_info *info;
4895 boolean emit_relocs;
4897 struct elf_final_link_info finfo;
4898 register asection *o;
4899 register struct bfd_link_order *p;
4901 bfd_size_type max_contents_size;
4902 bfd_size_type max_external_reloc_size;
4903 bfd_size_type max_internal_reloc_count;
4904 bfd_size_type max_sym_count;
4905 bfd_size_type max_sym_shndx_count;
4907 Elf_Internal_Sym elfsym;
4909 Elf_Internal_Shdr *symtab_hdr;
4910 Elf_Internal_Shdr *symstrtab_hdr;
4911 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4912 struct elf_outext_info eoinfo;
4914 size_t relativecount = 0;
4915 asection *reldyn = 0;
4918 if (! is_elf_hash_table (info))
4922 abfd->flags |= DYNAMIC;
4924 dynamic = elf_hash_table (info)->dynamic_sections_created;
4925 dynobj = elf_hash_table (info)->dynobj;
4927 emit_relocs = (info->relocateable
4928 || info->emitrelocations
4929 || bed->elf_backend_emit_relocs);
4932 finfo.output_bfd = abfd;
4933 finfo.symstrtab = elf_stringtab_init ();
4934 if (finfo.symstrtab == NULL)
4939 finfo.dynsym_sec = NULL;
4940 finfo.hash_sec = NULL;
4941 finfo.symver_sec = NULL;
4945 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
4946 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
4947 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
4948 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
4949 /* Note that it is OK if symver_sec is NULL. */
4952 finfo.contents = NULL;
4953 finfo.external_relocs = NULL;
4954 finfo.internal_relocs = NULL;
4955 finfo.external_syms = NULL;
4956 finfo.locsym_shndx = NULL;
4957 finfo.internal_syms = NULL;
4958 finfo.indices = NULL;
4959 finfo.sections = NULL;
4960 finfo.symbuf = NULL;
4961 finfo.symshndxbuf = NULL;
4962 finfo.symbuf_count = 0;
4964 /* Count up the number of relocations we will output for each output
4965 section, so that we know the sizes of the reloc sections. We
4966 also figure out some maximum sizes. */
4967 max_contents_size = 0;
4968 max_external_reloc_size = 0;
4969 max_internal_reloc_count = 0;
4971 max_sym_shndx_count = 0;
4973 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4977 for (p = o->link_order_head; p != NULL; p = p->next)
4979 if (p->type == bfd_section_reloc_link_order
4980 || p->type == bfd_symbol_reloc_link_order)
4982 else if (p->type == bfd_indirect_link_order)
4986 sec = p->u.indirect.section;
4988 /* Mark all sections which are to be included in the
4989 link. This will normally be every section. We need
4990 to do this so that we can identify any sections which
4991 the linker has decided to not include. */
4992 sec->linker_mark = true;
4994 if (sec->flags & SEC_MERGE)
4997 if (info->relocateable || info->emitrelocations)
4998 o->reloc_count += sec->reloc_count;
4999 else if (bed->elf_backend_count_relocs)
5001 Elf_Internal_Rela * relocs;
5003 relocs = (NAME(_bfd_elf,link_read_relocs)
5004 (abfd, sec, (PTR) NULL,
5005 (Elf_Internal_Rela *) NULL, info->keep_memory));
5008 += (*bed->elf_backend_count_relocs) (sec, relocs);
5010 if (!info->keep_memory)
5014 if (sec->_raw_size > max_contents_size)
5015 max_contents_size = sec->_raw_size;
5016 if (sec->_cooked_size > max_contents_size)
5017 max_contents_size = sec->_cooked_size;
5019 /* We are interested in just local symbols, not all
5021 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
5022 && (sec->owner->flags & DYNAMIC) == 0)
5026 if (elf_bad_symtab (sec->owner))
5027 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
5028 / sizeof (Elf_External_Sym));
5030 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
5032 if (sym_count > max_sym_count)
5033 max_sym_count = sym_count;
5035 if (sym_count > max_sym_shndx_count
5036 && elf_symtab_shndx (sec->owner) != 0)
5037 max_sym_shndx_count = sym_count;
5039 if ((sec->flags & SEC_RELOC) != 0)
5043 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
5044 if (ext_size > max_external_reloc_size)
5045 max_external_reloc_size = ext_size;
5046 if (sec->reloc_count > max_internal_reloc_count)
5047 max_internal_reloc_count = sec->reloc_count;
5053 if (o->reloc_count > 0)
5054 o->flags |= SEC_RELOC;
5057 /* Explicitly clear the SEC_RELOC flag. The linker tends to
5058 set it (this is probably a bug) and if it is set
5059 assign_section_numbers will create a reloc section. */
5060 o->flags &=~ SEC_RELOC;
5063 /* If the SEC_ALLOC flag is not set, force the section VMA to
5064 zero. This is done in elf_fake_sections as well, but forcing
5065 the VMA to 0 here will ensure that relocs against these
5066 sections are handled correctly. */
5067 if ((o->flags & SEC_ALLOC) == 0
5068 && ! o->user_set_vma)
5072 if (! info->relocateable && merged)
5073 elf_link_hash_traverse (elf_hash_table (info),
5074 elf_link_sec_merge_syms, (PTR) abfd);
5076 /* Figure out the file positions for everything but the symbol table
5077 and the relocs. We set symcount to force assign_section_numbers
5078 to create a symbol table. */
5079 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
5080 BFD_ASSERT (! abfd->output_has_begun);
5081 if (! _bfd_elf_compute_section_file_positions (abfd, info))
5084 /* Figure out how many relocations we will have in each section.
5085 Just using RELOC_COUNT isn't good enough since that doesn't
5086 maintain a separate value for REL vs. RELA relocations. */
5088 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
5089 for (o = sub->sections; o != NULL; o = o->next)
5091 asection *output_section;
5093 if (! o->linker_mark)
5095 /* This section was omitted from the link. */
5099 output_section = o->output_section;
5101 if (output_section != NULL
5102 && (o->flags & SEC_RELOC) != 0)
5104 struct bfd_elf_section_data *esdi
5105 = elf_section_data (o);
5106 struct bfd_elf_section_data *esdo
5107 = elf_section_data (output_section);
5108 unsigned int *rel_count;
5109 unsigned int *rel_count2;
5110 bfd_size_type entsize;
5111 bfd_size_type entsize2;
5113 /* We must be careful to add the relocations from the
5114 input section to the right output count. */
5115 entsize = esdi->rel_hdr.sh_entsize;
5116 entsize2 = esdi->rel_hdr2 ? esdi->rel_hdr2->sh_entsize : 0;
5117 BFD_ASSERT ((entsize == sizeof (Elf_External_Rel)
5118 || entsize == sizeof (Elf_External_Rela))
5119 && entsize2 != entsize
5121 || entsize2 == sizeof (Elf_External_Rel)
5122 || entsize2 == sizeof (Elf_External_Rela)));
5123 if (entsize == esdo->rel_hdr.sh_entsize)
5125 rel_count = &esdo->rel_count;
5126 rel_count2 = &esdo->rel_count2;
5130 rel_count = &esdo->rel_count2;
5131 rel_count2 = &esdo->rel_count;
5134 *rel_count += NUM_SHDR_ENTRIES (& esdi->rel_hdr);
5136 *rel_count2 += NUM_SHDR_ENTRIES (esdi->rel_hdr2);
5137 output_section->flags |= SEC_RELOC;
5141 /* That created the reloc sections. Set their sizes, and assign
5142 them file positions, and allocate some buffers. */
5143 for (o = abfd->sections; o != NULL; o = o->next)
5145 if ((o->flags & SEC_RELOC) != 0)
5147 if (!elf_link_size_reloc_section (abfd,
5148 &elf_section_data (o)->rel_hdr,
5152 if (elf_section_data (o)->rel_hdr2
5153 && !elf_link_size_reloc_section (abfd,
5154 elf_section_data (o)->rel_hdr2,
5159 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
5160 to count upwards while actually outputting the relocations. */
5161 elf_section_data (o)->rel_count = 0;
5162 elf_section_data (o)->rel_count2 = 0;
5165 _bfd_elf_assign_file_positions_for_relocs (abfd);
5167 /* We have now assigned file positions for all the sections except
5168 .symtab and .strtab. We start the .symtab section at the current
5169 file position, and write directly to it. We build the .strtab
5170 section in memory. */
5171 bfd_get_symcount (abfd) = 0;
5172 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
5173 /* sh_name is set in prep_headers. */
5174 symtab_hdr->sh_type = SHT_SYMTAB;
5175 symtab_hdr->sh_flags = 0;
5176 symtab_hdr->sh_addr = 0;
5177 symtab_hdr->sh_size = 0;
5178 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
5179 /* sh_link is set in assign_section_numbers. */
5180 /* sh_info is set below. */
5181 /* sh_offset is set just below. */
5182 symtab_hdr->sh_addralign = bed->s->file_align;
5184 off = elf_tdata (abfd)->next_file_pos;
5185 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
5187 /* Note that at this point elf_tdata (abfd)->next_file_pos is
5188 incorrect. We do not yet know the size of the .symtab section.
5189 We correct next_file_pos below, after we do know the size. */
5191 /* Allocate a buffer to hold swapped out symbols. This is to avoid
5192 continuously seeking to the right position in the file. */
5193 if (! info->keep_memory || max_sym_count < 20)
5194 finfo.symbuf_size = 20;
5196 finfo.symbuf_size = max_sym_count;
5197 amt = finfo.symbuf_size;
5198 amt *= sizeof (Elf_External_Sym);
5199 finfo.symbuf = (Elf_External_Sym *) bfd_malloc (amt);
5200 if (finfo.symbuf == NULL)
5202 if (elf_numsections (abfd) > SHN_LORESERVE)
5204 amt = finfo.symbuf_size;
5205 amt *= sizeof (Elf_External_Sym_Shndx);
5206 finfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
5207 if (finfo.symshndxbuf == NULL)
5211 /* Start writing out the symbol table. The first symbol is always a
5213 if (info->strip != strip_all
5216 elfsym.st_value = 0;
5219 elfsym.st_other = 0;
5220 elfsym.st_shndx = SHN_UNDEF;
5221 if (! elf_link_output_sym (&finfo, (const char *) NULL,
5222 &elfsym, bfd_und_section_ptr))
5227 /* Some standard ELF linkers do this, but we don't because it causes
5228 bootstrap comparison failures. */
5229 /* Output a file symbol for the output file as the second symbol.
5230 We output this even if we are discarding local symbols, although
5231 I'm not sure if this is correct. */
5232 elfsym.st_value = 0;
5234 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
5235 elfsym.st_other = 0;
5236 elfsym.st_shndx = SHN_ABS;
5237 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
5238 &elfsym, bfd_abs_section_ptr))
5242 /* Output a symbol for each section. We output these even if we are
5243 discarding local symbols, since they are used for relocs. These
5244 symbols have no names. We store the index of each one in the
5245 index field of the section, so that we can find it again when
5246 outputting relocs. */
5247 if (info->strip != strip_all
5251 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
5252 elfsym.st_other = 0;
5253 for (i = 1; i < elf_numsections (abfd); i++)
5255 o = section_from_elf_index (abfd, i);
5257 o->target_index = bfd_get_symcount (abfd);
5258 elfsym.st_shndx = i;
5259 if (info->relocateable || o == NULL)
5260 elfsym.st_value = 0;
5262 elfsym.st_value = o->vma;
5263 if (! elf_link_output_sym (&finfo, (const char *) NULL,
5266 if (i == SHN_LORESERVE)
5267 i += SHN_HIRESERVE + 1 - SHN_LORESERVE;
5271 /* Allocate some memory to hold information read in from the input
5273 if (max_contents_size != 0)
5275 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
5276 if (finfo.contents == NULL)
5280 if (max_external_reloc_size != 0)
5282 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
5283 if (finfo.external_relocs == NULL)
5287 if (max_internal_reloc_count != 0)
5289 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
5290 amt *= sizeof (Elf_Internal_Rela);
5291 finfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
5292 if (finfo.internal_relocs == NULL)
5296 if (max_sym_count != 0)
5298 amt = max_sym_count * sizeof (Elf_External_Sym);
5299 finfo.external_syms = (Elf_External_Sym *) bfd_malloc (amt);
5300 if (finfo.external_syms == NULL)
5303 amt = max_sym_count * sizeof (Elf_Internal_Sym);
5304 finfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
5305 if (finfo.internal_syms == NULL)
5308 amt = max_sym_count * sizeof (long);
5309 finfo.indices = (long *) bfd_malloc (amt);
5310 if (finfo.indices == NULL)
5313 amt = max_sym_count * sizeof (asection *);
5314 finfo.sections = (asection **) bfd_malloc (amt);
5315 if (finfo.sections == NULL)
5319 if (max_sym_shndx_count != 0)
5321 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
5322 finfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
5323 if (finfo.locsym_shndx == NULL)
5327 /* Since ELF permits relocations to be against local symbols, we
5328 must have the local symbols available when we do the relocations.
5329 Since we would rather only read the local symbols once, and we
5330 would rather not keep them in memory, we handle all the
5331 relocations for a single input file at the same time.
5333 Unfortunately, there is no way to know the total number of local
5334 symbols until we have seen all of them, and the local symbol
5335 indices precede the global symbol indices. This means that when
5336 we are generating relocateable output, and we see a reloc against
5337 a global symbol, we can not know the symbol index until we have
5338 finished examining all the local symbols to see which ones we are
5339 going to output. To deal with this, we keep the relocations in
5340 memory, and don't output them until the end of the link. This is
5341 an unfortunate waste of memory, but I don't see a good way around
5342 it. Fortunately, it only happens when performing a relocateable
5343 link, which is not the common case. FIXME: If keep_memory is set
5344 we could write the relocs out and then read them again; I don't
5345 know how bad the memory loss will be. */
5347 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
5348 sub->output_has_begun = false;
5349 for (o = abfd->sections; o != NULL; o = o->next)
5351 for (p = o->link_order_head; p != NULL; p = p->next)
5353 if (p->type == bfd_indirect_link_order
5354 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
5355 == bfd_target_elf_flavour)
5356 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
5358 if (! sub->output_has_begun)
5360 if (! elf_link_input_bfd (&finfo, sub))
5362 sub->output_has_begun = true;
5365 else if (p->type == bfd_section_reloc_link_order
5366 || p->type == bfd_symbol_reloc_link_order)
5368 if (! elf_reloc_link_order (abfd, info, o, p))
5373 if (! _bfd_default_link_order (abfd, info, o, p))
5379 /* Output any global symbols that got converted to local in a
5380 version script or due to symbol visibility. We do this in a
5381 separate step since ELF requires all local symbols to appear
5382 prior to any global symbols. FIXME: We should only do this if
5383 some global symbols were, in fact, converted to become local.
5384 FIXME: Will this work correctly with the Irix 5 linker? */
5385 eoinfo.failed = false;
5386 eoinfo.finfo = &finfo;
5387 eoinfo.localsyms = true;
5388 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
5393 /* That wrote out all the local symbols. Finish up the symbol table
5394 with the global symbols. Even if we want to strip everything we
5395 can, we still need to deal with those global symbols that got
5396 converted to local in a version script. */
5398 /* The sh_info field records the index of the first non local symbol. */
5399 symtab_hdr->sh_info = bfd_get_symcount (abfd);
5402 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
5404 Elf_Internal_Sym sym;
5405 Elf_External_Sym *dynsym =
5406 (Elf_External_Sym *) finfo.dynsym_sec->contents;
5407 long last_local = 0;
5409 /* Write out the section symbols for the output sections. */
5416 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
5419 for (s = abfd->sections; s != NULL; s = s->next)
5422 Elf_External_Sym *dest;
5424 indx = elf_section_data (s)->this_idx;
5425 BFD_ASSERT (indx > 0);
5426 sym.st_shndx = indx;
5427 sym.st_value = s->vma;
5428 dest = dynsym + elf_section_data (s)->dynindx;
5429 elf_swap_symbol_out (abfd, &sym, (PTR) dest, (PTR) 0);
5432 last_local = bfd_count_sections (abfd);
5435 /* Write out the local dynsyms. */
5436 if (elf_hash_table (info)->dynlocal)
5438 struct elf_link_local_dynamic_entry *e;
5439 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
5442 Elf_External_Sym *dest;
5444 sym.st_size = e->isym.st_size;
5445 sym.st_other = e->isym.st_other;
5447 /* Copy the internal symbol as is.
5448 Note that we saved a word of storage and overwrote
5449 the original st_name with the dynstr_index. */
5452 if (e->isym.st_shndx != SHN_UNDEF
5453 && (e->isym.st_shndx < SHN_LORESERVE
5454 || e->isym.st_shndx > SHN_HIRESERVE))
5456 s = bfd_section_from_elf_index (e->input_bfd,
5460 elf_section_data (s->output_section)->this_idx;
5461 sym.st_value = (s->output_section->vma
5463 + e->isym.st_value);
5466 if (last_local < e->dynindx)
5467 last_local = e->dynindx;
5469 dest = dynsym + e->dynindx;
5470 elf_swap_symbol_out (abfd, &sym, (PTR) dest, (PTR) 0);
5474 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
5478 /* We get the global symbols from the hash table. */
5479 eoinfo.failed = false;
5480 eoinfo.localsyms = false;
5481 eoinfo.finfo = &finfo;
5482 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
5487 /* If backend needs to output some symbols not present in the hash
5488 table, do it now. */
5489 if (bed->elf_backend_output_arch_syms)
5491 typedef boolean (*out_sym_func) PARAMS ((PTR, const char *,
5495 if (! ((*bed->elf_backend_output_arch_syms)
5496 (abfd, info, (PTR) &finfo, (out_sym_func) elf_link_output_sym)))
5500 /* Flush all symbols to the file. */
5501 if (! elf_link_flush_output_syms (&finfo))
5504 /* Now we know the size of the symtab section. */
5505 off += symtab_hdr->sh_size;
5507 /* Finish up and write out the symbol string table (.strtab)
5509 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
5510 /* sh_name was set in prep_headers. */
5511 symstrtab_hdr->sh_type = SHT_STRTAB;
5512 symstrtab_hdr->sh_flags = 0;
5513 symstrtab_hdr->sh_addr = 0;
5514 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
5515 symstrtab_hdr->sh_entsize = 0;
5516 symstrtab_hdr->sh_link = 0;
5517 symstrtab_hdr->sh_info = 0;
5518 /* sh_offset is set just below. */
5519 symstrtab_hdr->sh_addralign = 1;
5521 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
5522 elf_tdata (abfd)->next_file_pos = off;
5524 if (bfd_get_symcount (abfd) > 0)
5526 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
5527 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
5531 /* Adjust the relocs to have the correct symbol indices. */
5532 for (o = abfd->sections; o != NULL; o = o->next)
5534 if ((o->flags & SEC_RELOC) == 0)
5537 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
5538 elf_section_data (o)->rel_count,
5539 elf_section_data (o)->rel_hashes);
5540 if (elf_section_data (o)->rel_hdr2 != NULL)
5541 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
5542 elf_section_data (o)->rel_count2,
5543 (elf_section_data (o)->rel_hashes
5544 + elf_section_data (o)->rel_count));
5546 /* Set the reloc_count field to 0 to prevent write_relocs from
5547 trying to swap the relocs out itself. */
5551 if (dynamic && info->combreloc && dynobj != NULL)
5552 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
5554 /* If we are linking against a dynamic object, or generating a
5555 shared library, finish up the dynamic linking information. */
5558 Elf_External_Dyn *dyncon, *dynconend;
5560 /* Fix up .dynamic entries. */
5561 o = bfd_get_section_by_name (dynobj, ".dynamic");
5562 BFD_ASSERT (o != NULL);
5564 dyncon = (Elf_External_Dyn *) o->contents;
5565 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
5566 for (; dyncon < dynconend; dyncon++)
5568 Elf_Internal_Dyn dyn;
5572 elf_swap_dyn_in (dynobj, dyncon, &dyn);
5579 if (relativecount > 0 && dyncon + 1 < dynconend)
5581 switch (elf_section_data (reldyn)->this_hdr.sh_type)
5583 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
5584 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
5587 if (dyn.d_tag != DT_NULL)
5589 dyn.d_un.d_val = relativecount;
5590 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5596 name = info->init_function;
5599 name = info->fini_function;
5602 struct elf_link_hash_entry *h;
5604 h = elf_link_hash_lookup (elf_hash_table (info), name,
5605 false, false, true);
5607 && (h->root.type == bfd_link_hash_defined
5608 || h->root.type == bfd_link_hash_defweak))
5610 dyn.d_un.d_val = h->root.u.def.value;
5611 o = h->root.u.def.section;
5612 if (o->output_section != NULL)
5613 dyn.d_un.d_val += (o->output_section->vma
5614 + o->output_offset);
5617 /* The symbol is imported from another shared
5618 library and does not apply to this one. */
5622 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5627 case DT_PREINIT_ARRAYSZ:
5628 name = ".preinit_array";
5630 case DT_INIT_ARRAYSZ:
5631 name = ".init_array";
5633 case DT_FINI_ARRAYSZ:
5634 name = ".fini_array";
5636 o = bfd_get_section_by_name (abfd, name);
5637 BFD_ASSERT (o != NULL);
5638 if (o->_raw_size == 0)
5639 (*_bfd_error_handler)
5640 (_("warning: %s section has zero size"), name);
5641 dyn.d_un.d_val = o->_raw_size;
5642 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5645 case DT_PREINIT_ARRAY:
5646 name = ".preinit_array";
5649 name = ".init_array";
5652 name = ".fini_array";
5665 name = ".gnu.version_d";
5668 name = ".gnu.version_r";
5671 name = ".gnu.version";
5673 o = bfd_get_section_by_name (abfd, name);
5674 BFD_ASSERT (o != NULL);
5675 dyn.d_un.d_ptr = o->vma;
5676 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5683 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
5688 for (i = 1; i < elf_numsections (abfd); i++)
5690 Elf_Internal_Shdr *hdr;
5692 hdr = elf_elfsections (abfd)[i];
5693 if (hdr->sh_type == type
5694 && (hdr->sh_flags & SHF_ALLOC) != 0)
5696 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
5697 dyn.d_un.d_val += hdr->sh_size;
5700 if (dyn.d_un.d_val == 0
5701 || hdr->sh_addr < dyn.d_un.d_val)
5702 dyn.d_un.d_val = hdr->sh_addr;
5706 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5712 /* If we have created any dynamic sections, then output them. */
5715 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
5718 for (o = dynobj->sections; o != NULL; o = o->next)
5720 if ((o->flags & SEC_HAS_CONTENTS) == 0
5721 || o->_raw_size == 0
5722 || o->output_section == bfd_abs_section_ptr)
5724 if ((o->flags & SEC_LINKER_CREATED) == 0)
5726 /* At this point, we are only interested in sections
5727 created by elf_link_create_dynamic_sections. */
5730 if ((elf_section_data (o->output_section)->this_hdr.sh_type
5732 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
5734 if (! bfd_set_section_contents (abfd, o->output_section,
5736 (file_ptr) o->output_offset,
5742 /* The contents of the .dynstr section are actually in a
5744 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
5745 if (bfd_seek (abfd, off, SEEK_SET) != 0
5746 || ! _bfd_elf_strtab_emit (abfd,
5747 elf_hash_table (info)->dynstr))
5753 /* If we have optimized stabs strings, output them. */
5754 if (elf_hash_table (info)->stab_info != NULL)
5756 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
5760 if (info->eh_frame_hdr && elf_hash_table (info)->dynobj)
5762 o = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
5765 && (elf_section_data (o)->sec_info_type
5766 == ELF_INFO_TYPE_EH_FRAME_HDR))
5768 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, o))
5773 if (finfo.symstrtab != NULL)
5774 _bfd_stringtab_free (finfo.symstrtab);
5775 if (finfo.contents != NULL)
5776 free (finfo.contents);
5777 if (finfo.external_relocs != NULL)
5778 free (finfo.external_relocs);
5779 if (finfo.internal_relocs != NULL)
5780 free (finfo.internal_relocs);
5781 if (finfo.external_syms != NULL)
5782 free (finfo.external_syms);
5783 if (finfo.locsym_shndx != NULL)
5784 free (finfo.locsym_shndx);
5785 if (finfo.internal_syms != NULL)
5786 free (finfo.internal_syms);
5787 if (finfo.indices != NULL)
5788 free (finfo.indices);
5789 if (finfo.sections != NULL)
5790 free (finfo.sections);
5791 if (finfo.symbuf != NULL)
5792 free (finfo.symbuf);
5793 if (finfo.symshndxbuf != NULL)
5794 free (finfo.symbuf);
5795 for (o = abfd->sections; o != NULL; o = o->next)
5797 if ((o->flags & SEC_RELOC) != 0
5798 && elf_section_data (o)->rel_hashes != NULL)
5799 free (elf_section_data (o)->rel_hashes);
5802 elf_tdata (abfd)->linker = true;
5807 if (finfo.symstrtab != NULL)
5808 _bfd_stringtab_free (finfo.symstrtab);
5809 if (finfo.contents != NULL)
5810 free (finfo.contents);
5811 if (finfo.external_relocs != NULL)
5812 free (finfo.external_relocs);
5813 if (finfo.internal_relocs != NULL)
5814 free (finfo.internal_relocs);
5815 if (finfo.external_syms != NULL)
5816 free (finfo.external_syms);
5817 if (finfo.locsym_shndx != NULL)
5818 free (finfo.locsym_shndx);
5819 if (finfo.internal_syms != NULL)
5820 free (finfo.internal_syms);
5821 if (finfo.indices != NULL)
5822 free (finfo.indices);
5823 if (finfo.sections != NULL)
5824 free (finfo.sections);
5825 if (finfo.symbuf != NULL)
5826 free (finfo.symbuf);
5827 if (finfo.symshndxbuf != NULL)
5828 free (finfo.symbuf);
5829 for (o = abfd->sections; o != NULL; o = o->next)
5831 if ((o->flags & SEC_RELOC) != 0
5832 && elf_section_data (o)->rel_hashes != NULL)
5833 free (elf_section_data (o)->rel_hashes);
5839 /* Add a symbol to the output symbol table. */
5842 elf_link_output_sym (finfo, name, elfsym, input_sec)
5843 struct elf_final_link_info *finfo;
5845 Elf_Internal_Sym *elfsym;
5846 asection *input_sec;
5848 Elf_External_Sym *dest;
5849 Elf_External_Sym_Shndx *destshndx;
5851 boolean (*output_symbol_hook) PARAMS ((bfd *,
5852 struct bfd_link_info *info,
5857 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
5858 elf_backend_link_output_symbol_hook;
5859 if (output_symbol_hook != NULL)
5861 if (! ((*output_symbol_hook)
5862 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
5866 if (name == (const char *) NULL || *name == '\0')
5867 elfsym->st_name = 0;
5868 else if (input_sec->flags & SEC_EXCLUDE)
5869 elfsym->st_name = 0;
5872 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
5874 if (elfsym->st_name == (unsigned long) -1)
5878 if (finfo->symbuf_count >= finfo->symbuf_size)
5880 if (! elf_link_flush_output_syms (finfo))
5884 dest = finfo->symbuf + finfo->symbuf_count;
5885 destshndx = finfo->symshndxbuf;
5886 if (destshndx != NULL)
5887 destshndx += finfo->symbuf_count;
5888 elf_swap_symbol_out (finfo->output_bfd, elfsym, (PTR) dest, (PTR) destshndx);
5889 ++finfo->symbuf_count;
5891 ++ bfd_get_symcount (finfo->output_bfd);
5896 /* Flush the output symbols to the file. */
5899 elf_link_flush_output_syms (finfo)
5900 struct elf_final_link_info *finfo;
5902 if (finfo->symbuf_count > 0)
5904 Elf_Internal_Shdr *hdr;
5908 hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
5909 pos = hdr->sh_offset + hdr->sh_size;
5910 amt = finfo->symbuf_count * sizeof (Elf_External_Sym);
5911 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
5912 || bfd_bwrite ((PTR) finfo->symbuf, amt, finfo->output_bfd) != amt)
5915 hdr->sh_size += amt;
5917 if (finfo->symshndxbuf != NULL)
5919 hdr = &elf_tdata (finfo->output_bfd)->symtab_shndx_hdr;
5920 pos = hdr->sh_offset + hdr->sh_size;
5921 amt = finfo->symbuf_count * sizeof (Elf_External_Sym_Shndx);
5922 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
5923 || (bfd_bwrite ((PTR) finfo->symshndxbuf, amt, finfo->output_bfd)
5927 hdr->sh_size += amt;
5930 finfo->symbuf_count = 0;
5936 /* Adjust all external symbols pointing into SEC_MERGE sections
5937 to reflect the object merging within the sections. */
5940 elf_link_sec_merge_syms (h, data)
5941 struct elf_link_hash_entry *h;
5946 if (h->root.type == bfd_link_hash_warning)
5947 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5949 if ((h->root.type == bfd_link_hash_defined
5950 || h->root.type == bfd_link_hash_defweak)
5951 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
5952 && elf_section_data (sec)->sec_info_type == ELF_INFO_TYPE_MERGE)
5954 bfd *output_bfd = (bfd *) data;
5956 h->root.u.def.value =
5957 _bfd_merged_section_offset (output_bfd,
5958 &h->root.u.def.section,
5959 elf_section_data (sec)->sec_info,
5960 h->root.u.def.value, (bfd_vma) 0);
5966 /* Add an external symbol to the symbol table. This is called from
5967 the hash table traversal routine. When generating a shared object,
5968 we go through the symbol table twice. The first time we output
5969 anything that might have been forced to local scope in a version
5970 script. The second time we output the symbols that are still
5974 elf_link_output_extsym (h, data)
5975 struct elf_link_hash_entry *h;
5978 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
5979 struct elf_final_link_info *finfo = eoinfo->finfo;
5981 Elf_Internal_Sym sym;
5982 asection *input_sec;
5984 if (h->root.type == bfd_link_hash_warning)
5986 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5987 if (h->root.type == bfd_link_hash_new)
5991 /* Decide whether to output this symbol in this pass. */
5992 if (eoinfo->localsyms)
5994 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5999 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6003 /* If we are not creating a shared library, and this symbol is
6004 referenced by a shared library but is not defined anywhere, then
6005 warn that it is undefined. If we do not do this, the runtime
6006 linker will complain that the symbol is undefined when the
6007 program is run. We don't have to worry about symbols that are
6008 referenced by regular files, because we will already have issued
6009 warnings for them. */
6010 if (! finfo->info->relocateable
6011 && ! finfo->info->allow_shlib_undefined
6012 && ! finfo->info->shared
6013 && h->root.type == bfd_link_hash_undefined
6014 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
6015 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
6017 if (! ((*finfo->info->callbacks->undefined_symbol)
6018 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
6019 (asection *) NULL, (bfd_vma) 0, true)))
6021 eoinfo->failed = true;
6026 /* We don't want to output symbols that have never been mentioned by
6027 a regular file, or that we have been told to strip. However, if
6028 h->indx is set to -2, the symbol is used by a reloc and we must
6032 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
6033 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
6034 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
6035 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
6037 else if (finfo->info->strip == strip_all
6038 || (finfo->info->strip == strip_some
6039 && bfd_hash_lookup (finfo->info->keep_hash,
6040 h->root.root.string,
6041 false, false) == NULL))
6046 /* If we're stripping it, and it's not a dynamic symbol, there's
6047 nothing else to do unless it is a forced local symbol. */
6050 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6054 sym.st_size = h->size;
6055 sym.st_other = h->other;
6056 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6057 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
6058 else if (h->root.type == bfd_link_hash_undefweak
6059 || h->root.type == bfd_link_hash_defweak)
6060 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
6062 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
6064 switch (h->root.type)
6067 case bfd_link_hash_new:
6068 case bfd_link_hash_warning:
6072 case bfd_link_hash_undefined:
6073 case bfd_link_hash_undefweak:
6074 input_sec = bfd_und_section_ptr;
6075 sym.st_shndx = SHN_UNDEF;
6078 case bfd_link_hash_defined:
6079 case bfd_link_hash_defweak:
6081 input_sec = h->root.u.def.section;
6082 if (input_sec->output_section != NULL)
6085 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
6086 input_sec->output_section);
6087 if (sym.st_shndx == SHN_BAD)
6089 (*_bfd_error_handler)
6090 (_("%s: could not find output section %s for input section %s"),
6091 bfd_get_filename (finfo->output_bfd),
6092 input_sec->output_section->name,
6094 eoinfo->failed = true;
6098 /* ELF symbols in relocateable files are section relative,
6099 but in nonrelocateable files they are virtual
6101 sym.st_value = h->root.u.def.value + input_sec->output_offset;
6102 if (! finfo->info->relocateable)
6103 sym.st_value += input_sec->output_section->vma;
6107 BFD_ASSERT (input_sec->owner == NULL
6108 || (input_sec->owner->flags & DYNAMIC) != 0);
6109 sym.st_shndx = SHN_UNDEF;
6110 input_sec = bfd_und_section_ptr;
6115 case bfd_link_hash_common:
6116 input_sec = h->root.u.c.p->section;
6117 sym.st_shndx = SHN_COMMON;
6118 sym.st_value = 1 << h->root.u.c.p->alignment_power;
6121 case bfd_link_hash_indirect:
6122 /* These symbols are created by symbol versioning. They point
6123 to the decorated version of the name. For example, if the
6124 symbol foo@@GNU_1.2 is the default, which should be used when
6125 foo is used with no version, then we add an indirect symbol
6126 foo which points to foo@@GNU_1.2. We ignore these symbols,
6127 since the indirected symbol is already in the hash table. */
6131 /* Give the processor backend a chance to tweak the symbol value,
6132 and also to finish up anything that needs to be done for this
6133 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6134 forced local syms when non-shared is due to a historical quirk. */
6135 if ((h->dynindx != -1
6136 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6137 && (finfo->info->shared
6138 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6139 && elf_hash_table (finfo->info)->dynamic_sections_created)
6141 struct elf_backend_data *bed;
6143 bed = get_elf_backend_data (finfo->output_bfd);
6144 if (! ((*bed->elf_backend_finish_dynamic_symbol)
6145 (finfo->output_bfd, finfo->info, h, &sym)))
6147 eoinfo->failed = true;
6152 /* If we are marking the symbol as undefined, and there are no
6153 non-weak references to this symbol from a regular object, then
6154 mark the symbol as weak undefined; if there are non-weak
6155 references, mark the symbol as strong. We can't do this earlier,
6156 because it might not be marked as undefined until the
6157 finish_dynamic_symbol routine gets through with it. */
6158 if (sym.st_shndx == SHN_UNDEF
6159 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
6160 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
6161 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
6165 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
6166 bindtype = STB_GLOBAL;
6168 bindtype = STB_WEAK;
6169 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
6172 /* If a symbol is not defined locally, we clear the visibility
6174 if (! finfo->info->relocateable
6175 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6176 sym.st_other ^= ELF_ST_VISIBILITY (sym.st_other);
6178 /* If this symbol should be put in the .dynsym section, then put it
6179 there now. We have already know the symbol index. We also fill
6180 in the entry in the .hash section. */
6181 if (h->dynindx != -1
6182 && elf_hash_table (finfo->info)->dynamic_sections_created)
6186 size_t hash_entry_size;
6187 bfd_byte *bucketpos;
6189 Elf_External_Sym *esym;
6191 sym.st_name = h->dynstr_index;
6192 esym = (Elf_External_Sym *) finfo->dynsym_sec->contents + h->dynindx;
6193 elf_swap_symbol_out (finfo->output_bfd, &sym, (PTR) esym, (PTR) 0);
6195 bucketcount = elf_hash_table (finfo->info)->bucketcount;
6196 bucket = h->elf_hash_value % bucketcount;
6198 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
6199 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
6200 + (bucket + 2) * hash_entry_size);
6201 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
6202 bfd_put (8 * hash_entry_size, finfo->output_bfd, (bfd_vma) h->dynindx,
6204 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
6205 ((bfd_byte *) finfo->hash_sec->contents
6206 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
6208 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
6210 Elf_Internal_Versym iversym;
6211 Elf_External_Versym *eversym;
6213 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6215 if (h->verinfo.verdef == NULL)
6216 iversym.vs_vers = 0;
6218 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
6222 if (h->verinfo.vertree == NULL)
6223 iversym.vs_vers = 1;
6225 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
6228 if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
6229 iversym.vs_vers |= VERSYM_HIDDEN;
6231 eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
6232 eversym += h->dynindx;
6233 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
6237 /* If we're stripping it, then it was just a dynamic symbol, and
6238 there's nothing else to do. */
6242 h->indx = bfd_get_symcount (finfo->output_bfd);
6244 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
6246 eoinfo->failed = true;
6253 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
6254 originated from the section given by INPUT_REL_HDR) to the
6258 elf_link_output_relocs (output_bfd, input_section, input_rel_hdr,
6261 asection *input_section;
6262 Elf_Internal_Shdr *input_rel_hdr;
6263 Elf_Internal_Rela *internal_relocs;
6265 Elf_Internal_Rela *irela;
6266 Elf_Internal_Rela *irelaend;
6267 Elf_Internal_Shdr *output_rel_hdr;
6268 asection *output_section;
6269 unsigned int *rel_countp = NULL;
6270 struct elf_backend_data *bed;
6273 output_section = input_section->output_section;
6274 output_rel_hdr = NULL;
6276 if (elf_section_data (output_section)->rel_hdr.sh_entsize
6277 == input_rel_hdr->sh_entsize)
6279 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
6280 rel_countp = &elf_section_data (output_section)->rel_count;
6282 else if (elf_section_data (output_section)->rel_hdr2
6283 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
6284 == input_rel_hdr->sh_entsize))
6286 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
6287 rel_countp = &elf_section_data (output_section)->rel_count2;
6291 (*_bfd_error_handler) (
6292 _("%s: relocation size mismatch in %s section %s"),
6293 bfd_get_filename (output_bfd),
6294 bfd_archive_filename (input_section->owner),
6295 input_section->name);
6296 bfd_set_error (bfd_error_wrong_object_format);
6300 bed = get_elf_backend_data (output_bfd);
6301 irela = internal_relocs;
6302 irelaend = irela + NUM_SHDR_ENTRIES (input_rel_hdr)
6303 * bed->s->int_rels_per_ext_rel;
6305 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
6307 Elf_External_Rel *erel;
6308 Elf_Internal_Rel *irel;
6310 amt = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
6311 irel = (Elf_Internal_Rel *) bfd_zmalloc (amt);
6314 (*_bfd_error_handler) (_("Error: out of memory"));
6318 erel = ((Elf_External_Rel *) output_rel_hdr->contents + *rel_countp);
6319 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erel++)
6323 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
6325 irel[i].r_offset = irela[i].r_offset;
6326 irel[i].r_info = irela[i].r_info;
6327 BFD_ASSERT (irela[i].r_addend == 0);
6330 if (bed->s->swap_reloc_out)
6331 (*bed->s->swap_reloc_out) (output_bfd, irel, (PTR) erel);
6333 elf_swap_reloc_out (output_bfd, irel, erel);
6340 Elf_External_Rela *erela;
6342 BFD_ASSERT (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rela));
6344 erela = ((Elf_External_Rela *) output_rel_hdr->contents + *rel_countp);
6345 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erela++)
6346 if (bed->s->swap_reloca_out)
6347 (*bed->s->swap_reloca_out) (output_bfd, irela, (PTR) erela);
6349 elf_swap_reloca_out (output_bfd, irela, erela);
6352 /* Bump the counter, so that we know where to add the next set of
6354 *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr);
6359 /* Link an input file into the linker output file. This function
6360 handles all the sections and relocations of the input file at once.
6361 This is so that we only have to read the local symbols once, and
6362 don't have to keep them in memory. */
6365 elf_link_input_bfd (finfo, input_bfd)
6366 struct elf_final_link_info *finfo;
6369 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
6370 bfd *, asection *, bfd_byte *,
6371 Elf_Internal_Rela *,
6372 Elf_Internal_Sym *, asection **));
6374 Elf_Internal_Shdr *symtab_hdr;
6375 Elf_Internal_Shdr *shndx_hdr;
6378 Elf_External_Sym *external_syms;
6379 Elf_External_Sym *esym;
6380 Elf_External_Sym *esymend;
6381 Elf_External_Sym_Shndx *shndx_buf;
6382 Elf_External_Sym_Shndx *shndx;
6383 Elf_Internal_Sym *isym;
6385 asection **ppsection;
6387 struct elf_backend_data *bed;
6388 boolean emit_relocs;
6389 struct elf_link_hash_entry **sym_hashes;
6391 output_bfd = finfo->output_bfd;
6392 bed = get_elf_backend_data (output_bfd);
6393 relocate_section = bed->elf_backend_relocate_section;
6395 /* If this is a dynamic object, we don't want to do anything here:
6396 we don't want the local symbols, and we don't want the section
6398 if ((input_bfd->flags & DYNAMIC) != 0)
6401 emit_relocs = (finfo->info->relocateable
6402 || finfo->info->emitrelocations
6403 || bed->elf_backend_emit_relocs);
6405 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
6406 if (elf_bad_symtab (input_bfd))
6408 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6413 locsymcount = symtab_hdr->sh_info;
6414 extsymoff = symtab_hdr->sh_info;
6417 /* Read the local symbols. */
6418 if (symtab_hdr->contents != NULL)
6419 external_syms = (Elf_External_Sym *) symtab_hdr->contents;
6420 else if (locsymcount == 0)
6421 external_syms = NULL;
6424 bfd_size_type amt = locsymcount * sizeof (Elf_External_Sym);
6425 external_syms = finfo->external_syms;
6426 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
6427 || bfd_bread (external_syms, amt, input_bfd) != amt)
6431 shndx_hdr = &elf_tdata (input_bfd)->symtab_shndx_hdr;
6433 if (shndx_hdr->sh_size != 0 && locsymcount != 0)
6435 bfd_size_type amt = locsymcount * sizeof (Elf_External_Sym_Shndx);
6436 shndx_buf = finfo->locsym_shndx;
6437 if (bfd_seek (input_bfd, shndx_hdr->sh_offset, SEEK_SET) != 0
6438 || bfd_bread (shndx_buf, amt, input_bfd) != amt)
6442 /* Swap in the local symbols and write out the ones which we know
6443 are going into the output file. */
6444 for (esym = external_syms, esymend = esym + locsymcount,
6445 isym = finfo->internal_syms, pindex = finfo->indices,
6446 ppsection = finfo->sections, shndx = shndx_buf;
6448 esym++, isym++, pindex++, ppsection++,
6449 shndx = (shndx != NULL ? shndx + 1 : NULL))
6453 Elf_Internal_Sym osym;
6455 elf_swap_symbol_in (input_bfd, esym, shndx, isym);
6458 if (elf_bad_symtab (input_bfd))
6460 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
6467 if (isym->st_shndx == SHN_UNDEF)
6468 isec = bfd_und_section_ptr;
6469 else if (isym->st_shndx < SHN_LORESERVE
6470 || isym->st_shndx > SHN_HIRESERVE)
6472 isec = section_from_elf_index (input_bfd, isym->st_shndx);
6474 && elf_section_data (isec)->sec_info_type == ELF_INFO_TYPE_MERGE
6475 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
6477 _bfd_merged_section_offset (output_bfd, &isec,
6478 elf_section_data (isec)->sec_info,
6479 isym->st_value, (bfd_vma) 0);
6481 else if (isym->st_shndx == SHN_ABS)
6482 isec = bfd_abs_section_ptr;
6483 else if (isym->st_shndx == SHN_COMMON)
6484 isec = bfd_com_section_ptr;
6493 /* Don't output the first, undefined, symbol. */
6494 if (esym == external_syms)
6497 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
6499 /* We never output section symbols. Instead, we use the
6500 section symbol of the corresponding section in the output
6505 /* If we are stripping all symbols, we don't want to output this
6507 if (finfo->info->strip == strip_all)
6510 /* If we are discarding all local symbols, we don't want to
6511 output this one. If we are generating a relocateable output
6512 file, then some of the local symbols may be required by
6513 relocs; we output them below as we discover that they are
6515 if (finfo->info->discard == discard_all)
6518 /* If this symbol is defined in a section which we are
6519 discarding, we don't need to keep it, but note that
6520 linker_mark is only reliable for sections that have contents.
6521 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6522 as well as linker_mark. */
6523 if ((isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
6525 && ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
6526 || (! finfo->info->relocateable
6527 && (isec->flags & SEC_EXCLUDE) != 0)))
6530 /* Get the name of the symbol. */
6531 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
6536 /* See if we are discarding symbols with this name. */
6537 if ((finfo->info->strip == strip_some
6538 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
6540 || (((finfo->info->discard == discard_sec_merge
6541 && (isec->flags & SEC_MERGE) && ! finfo->info->relocateable)
6542 || finfo->info->discard == discard_l)
6543 && bfd_is_local_label_name (input_bfd, name)))
6546 /* If we get here, we are going to output this symbol. */
6550 /* Adjust the section index for the output file. */
6551 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
6552 isec->output_section);
6553 if (osym.st_shndx == SHN_BAD)
6556 *pindex = bfd_get_symcount (output_bfd);
6558 /* ELF symbols in relocateable files are section relative, but
6559 in executable files they are virtual addresses. Note that
6560 this code assumes that all ELF sections have an associated
6561 BFD section with a reasonable value for output_offset; below
6562 we assume that they also have a reasonable value for
6563 output_section. Any special sections must be set up to meet
6564 these requirements. */
6565 osym.st_value += isec->output_offset;
6566 if (! finfo->info->relocateable)
6567 osym.st_value += isec->output_section->vma;
6569 if (! elf_link_output_sym (finfo, name, &osym, isec))
6573 /* Relocate the contents of each section. */
6574 sym_hashes = elf_sym_hashes (input_bfd);
6575 for (o = input_bfd->sections; o != NULL; o = o->next)
6579 if (! o->linker_mark)
6581 /* This section was omitted from the link. */
6585 if ((o->flags & SEC_HAS_CONTENTS) == 0
6586 || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
6589 if ((o->flags & SEC_LINKER_CREATED) != 0)
6591 /* Section was created by elf_link_create_dynamic_sections
6596 /* Get the contents of the section. They have been cached by a
6597 relaxation routine. Note that o is a section in an input
6598 file, so the contents field will not have been set by any of
6599 the routines which work on output files. */
6600 if (elf_section_data (o)->this_hdr.contents != NULL)
6601 contents = elf_section_data (o)->this_hdr.contents;
6604 contents = finfo->contents;
6605 if (! bfd_get_section_contents (input_bfd, o, contents,
6606 (file_ptr) 0, o->_raw_size))
6610 if ((o->flags & SEC_RELOC) != 0)
6612 Elf_Internal_Rela *internal_relocs;
6614 /* Get the swapped relocs. */
6615 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
6616 (input_bfd, o, finfo->external_relocs,
6617 finfo->internal_relocs, false));
6618 if (internal_relocs == NULL
6619 && o->reloc_count > 0)
6622 /* Run through the relocs looking for any against symbols
6623 from discarded sections and section symbols from
6624 removed link-once sections. Complain about relocs
6625 against discarded sections. Zero relocs against removed
6626 link-once sections. We should really complain if
6627 anything in the final link tries to use it, but
6628 DWARF-based exception handling might have an entry in
6629 .eh_frame to describe a routine in the linkonce section,
6630 and it turns out to be hard to remove the .eh_frame
6631 entry too. FIXME. */
6632 if (!finfo->info->relocateable
6633 && !elf_section_ignore_discarded_relocs (o))
6635 Elf_Internal_Rela *rel, *relend;
6637 rel = internal_relocs;
6638 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
6639 for ( ; rel < relend; rel++)
6641 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
6643 if (r_symndx >= locsymcount
6644 || (elf_bad_symtab (input_bfd)
6645 && finfo->sections[r_symndx] == NULL))
6647 struct elf_link_hash_entry *h;
6649 h = sym_hashes[r_symndx - extsymoff];
6650 while (h->root.type == bfd_link_hash_indirect
6651 || h->root.type == bfd_link_hash_warning)
6652 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6654 /* Complain if the definition comes from a
6655 discarded section. */
6656 if ((h->root.type == bfd_link_hash_defined
6657 || h->root.type == bfd_link_hash_defweak)
6658 && elf_discarded_section (h->root.u.def.section))
6660 #if BFD_VERSION_DATE < 20031005
6661 if ((o->flags & SEC_DEBUGGING) != 0)
6663 #if BFD_VERSION_DATE > 20021005
6664 (*finfo->info->callbacks->warning)
6666 _("warning: relocation against removed section; zeroing"),
6667 NULL, input_bfd, o, rel->r_offset);
6669 BFD_ASSERT (r_symndx != 0);
6670 memset (rel, 0, sizeof (*rel));
6675 if (! ((*finfo->info->callbacks->undefined_symbol)
6676 (finfo->info, h->root.root.string,
6677 input_bfd, o, rel->r_offset,
6685 asection *sec = finfo->sections[r_symndx];
6687 if (sec != NULL && elf_discarded_section (sec))
6689 #if BFD_VERSION_DATE < 20031005
6690 if ((o->flags & SEC_DEBUGGING) != 0
6691 || (sec->flags & SEC_LINK_ONCE) != 0)
6693 #if BFD_VERSION_DATE > 20021005
6694 (*finfo->info->callbacks->warning)
6696 _("warning: relocation against removed section"),
6697 NULL, input_bfd, o, rel->r_offset);
6699 BFD_ASSERT (r_symndx != 0);
6701 = ELF_R_INFO (0, ELF_R_TYPE (rel->r_info));
6709 = _("local symbols in discarded section %s");
6711 = strlen (sec->name) + strlen (msg) - 1;
6712 char *buf = (char *) bfd_malloc (amt);
6715 sprintf (buf, msg, sec->name);
6717 buf = (char *) sec->name;
6718 ok = (*finfo->info->callbacks
6719 ->undefined_symbol) (finfo->info, buf,
6723 if (buf != sec->name)
6733 /* Relocate the section by invoking a back end routine.
6735 The back end routine is responsible for adjusting the
6736 section contents as necessary, and (if using Rela relocs
6737 and generating a relocateable output file) adjusting the
6738 reloc addend as necessary.
6740 The back end routine does not have to worry about setting
6741 the reloc address or the reloc symbol index.
6743 The back end routine is given a pointer to the swapped in
6744 internal symbols, and can access the hash table entries
6745 for the external symbols via elf_sym_hashes (input_bfd).
6747 When generating relocateable output, the back end routine
6748 must handle STB_LOCAL/STT_SECTION symbols specially. The
6749 output symbol is going to be a section symbol
6750 corresponding to the output section, which will require
6751 the addend to be adjusted. */
6753 if (! (*relocate_section) (output_bfd, finfo->info,
6754 input_bfd, o, contents,
6756 finfo->internal_syms,
6762 Elf_Internal_Rela *irela;
6763 Elf_Internal_Rela *irelaend;
6764 struct elf_link_hash_entry **rel_hash;
6765 Elf_Internal_Shdr *input_rel_hdr;
6766 unsigned int next_erel;
6767 boolean (*reloc_emitter) PARAMS ((bfd *, asection *,
6768 Elf_Internal_Shdr *,
6769 Elf_Internal_Rela *));
6770 boolean rela_normal;
6772 input_rel_hdr = &elf_section_data (o)->rel_hdr;
6773 rela_normal = (bed->rela_normal
6774 && (input_rel_hdr->sh_entsize
6775 == sizeof (Elf_External_Rela)));
6777 /* Adjust the reloc addresses and symbol indices. */
6779 irela = internal_relocs;
6780 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
6781 rel_hash = (elf_section_data (o->output_section)->rel_hashes
6782 + elf_section_data (o->output_section)->rel_count
6783 + elf_section_data (o->output_section)->rel_count2);
6784 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
6786 unsigned long r_symndx;
6789 if (next_erel == bed->s->int_rels_per_ext_rel)
6795 irela->r_offset += o->output_offset;
6797 /* Relocs in an executable have to be virtual addresses. */
6798 if (!finfo->info->relocateable)
6799 irela->r_offset += o->output_section->vma;
6801 r_symndx = ELF_R_SYM (irela->r_info);
6806 if (r_symndx >= locsymcount
6807 || (elf_bad_symtab (input_bfd)
6808 && finfo->sections[r_symndx] == NULL))
6810 struct elf_link_hash_entry *rh;
6813 /* This is a reloc against a global symbol. We
6814 have not yet output all the local symbols, so
6815 we do not know the symbol index of any global
6816 symbol. We set the rel_hash entry for this
6817 reloc to point to the global hash table entry
6818 for this symbol. The symbol index is then
6819 set at the end of elf_bfd_final_link. */
6820 indx = r_symndx - extsymoff;
6821 rh = elf_sym_hashes (input_bfd)[indx];
6822 while (rh->root.type == bfd_link_hash_indirect
6823 || rh->root.type == bfd_link_hash_warning)
6824 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
6826 /* Setting the index to -2 tells
6827 elf_link_output_extsym that this symbol is
6829 BFD_ASSERT (rh->indx < 0);
6837 /* This is a reloc against a local symbol. */
6840 isym = finfo->internal_syms + r_symndx;
6841 sec = finfo->sections[r_symndx];
6842 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
6844 /* I suppose the backend ought to fill in the
6845 section of any STT_SECTION symbol against a
6846 processor specific section. If we have
6847 discarded a section, the output_section will
6848 be the absolute section. */
6849 if (bfd_is_abs_section (sec)
6851 && bfd_is_abs_section (sec->output_section)))
6853 else if (sec == NULL || sec->owner == NULL)
6855 bfd_set_error (bfd_error_bad_value);
6860 r_symndx = sec->output_section->target_index;
6861 BFD_ASSERT (r_symndx != 0);
6864 /* Adjust the addend according to where the
6865 section winds up in the output section. */
6867 irela->r_addend += sec->output_offset;
6871 if (finfo->indices[r_symndx] == -1)
6873 unsigned long shlink;
6877 if (finfo->info->strip == strip_all)
6879 /* You can't do ld -r -s. */
6880 bfd_set_error (bfd_error_invalid_operation);
6884 /* This symbol was skipped earlier, but
6885 since it is needed by a reloc, we
6886 must output it now. */
6887 shlink = symtab_hdr->sh_link;
6888 name = (bfd_elf_string_from_elf_section
6889 (input_bfd, shlink, isym->st_name));
6893 osec = sec->output_section;
6895 _bfd_elf_section_from_bfd_section (output_bfd,
6897 if (isym->st_shndx == SHN_BAD)
6900 isym->st_value += sec->output_offset;
6901 if (! finfo->info->relocateable)
6902 isym->st_value += osec->vma;
6904 finfo->indices[r_symndx]
6905 = bfd_get_symcount (output_bfd);
6907 if (! elf_link_output_sym (finfo, name, isym, sec))
6911 r_symndx = finfo->indices[r_symndx];
6914 irela->r_info = ELF_R_INFO (r_symndx,
6915 ELF_R_TYPE (irela->r_info));
6918 /* Swap out the relocs. */
6919 if (bed->elf_backend_emit_relocs
6920 && !(finfo->info->relocateable
6921 || finfo->info->emitrelocations))
6922 reloc_emitter = bed->elf_backend_emit_relocs;
6924 reloc_emitter = elf_link_output_relocs;
6926 if (! (*reloc_emitter) (output_bfd, o, input_rel_hdr,
6930 input_rel_hdr = elf_section_data (o)->rel_hdr2;
6933 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
6934 * bed->s->int_rels_per_ext_rel);
6935 if (! (*reloc_emitter) (output_bfd, o, input_rel_hdr,
6943 /* Write out the modified section contents. */
6944 if (bed->elf_backend_write_section
6945 && (*bed->elf_backend_write_section) (output_bfd, o, contents))
6947 /* Section written out. */
6949 else switch (elf_section_data (o)->sec_info_type)
6951 case ELF_INFO_TYPE_STABS:
6952 if (! (_bfd_write_section_stabs
6954 &elf_hash_table (finfo->info)->stab_info,
6955 o, &elf_section_data (o)->sec_info, contents)))
6958 case ELF_INFO_TYPE_MERGE:
6959 if (! (_bfd_write_merged_section
6960 (output_bfd, o, elf_section_data (o)->sec_info)))
6963 case ELF_INFO_TYPE_EH_FRAME:
6968 = bfd_get_section_by_name (elf_hash_table (finfo->info)->dynobj,
6970 if (! (_bfd_elf_write_section_eh_frame (output_bfd, o, ehdrsec,
6977 bfd_size_type sec_size;
6979 sec_size = (o->_cooked_size != 0 ? o->_cooked_size : o->_raw_size);
6980 if (! (o->flags & SEC_EXCLUDE)
6981 && ! bfd_set_section_contents (output_bfd, o->output_section,
6983 (file_ptr) o->output_offset,
6994 /* Generate a reloc when linking an ELF file. This is a reloc
6995 requested by the linker, and does come from any input file. This
6996 is used to build constructor and destructor tables when linking
7000 elf_reloc_link_order (output_bfd, info, output_section, link_order)
7002 struct bfd_link_info *info;
7003 asection *output_section;
7004 struct bfd_link_order *link_order;
7006 reloc_howto_type *howto;
7010 struct elf_link_hash_entry **rel_hash_ptr;
7011 Elf_Internal_Shdr *rel_hdr;
7012 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
7014 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
7017 bfd_set_error (bfd_error_bad_value);
7021 addend = link_order->u.reloc.p->addend;
7023 /* Figure out the symbol index. */
7024 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
7025 + elf_section_data (output_section)->rel_count
7026 + elf_section_data (output_section)->rel_count2);
7027 if (link_order->type == bfd_section_reloc_link_order)
7029 indx = link_order->u.reloc.p->u.section->target_index;
7030 BFD_ASSERT (indx != 0);
7031 *rel_hash_ptr = NULL;
7035 struct elf_link_hash_entry *h;
7037 /* Treat a reloc against a defined symbol as though it were
7038 actually against the section. */
7039 h = ((struct elf_link_hash_entry *)
7040 bfd_wrapped_link_hash_lookup (output_bfd, info,
7041 link_order->u.reloc.p->u.name,
7042 false, false, true));
7044 && (h->root.type == bfd_link_hash_defined
7045 || h->root.type == bfd_link_hash_defweak))
7049 section = h->root.u.def.section;
7050 indx = section->output_section->target_index;
7051 *rel_hash_ptr = NULL;
7052 /* It seems that we ought to add the symbol value to the
7053 addend here, but in practice it has already been added
7054 because it was passed to constructor_callback. */
7055 addend += section->output_section->vma + section->output_offset;
7059 /* Setting the index to -2 tells elf_link_output_extsym that
7060 this symbol is used by a reloc. */
7067 if (! ((*info->callbacks->unattached_reloc)
7068 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
7069 (asection *) NULL, (bfd_vma) 0)))
7075 /* If this is an inplace reloc, we must write the addend into the
7077 if (howto->partial_inplace && addend != 0)
7080 bfd_reloc_status_type rstat;
7083 const char *sym_name;
7085 size = bfd_get_reloc_size (howto);
7086 buf = (bfd_byte *) bfd_zmalloc (size);
7087 if (buf == (bfd_byte *) NULL)
7089 rstat = _bfd_relocate_contents (howto, output_bfd, (bfd_vma) addend, buf);
7096 case bfd_reloc_outofrange:
7099 case bfd_reloc_overflow:
7100 if (link_order->type == bfd_section_reloc_link_order)
7101 sym_name = bfd_section_name (output_bfd,
7102 link_order->u.reloc.p->u.section);
7104 sym_name = link_order->u.reloc.p->u.name;
7105 if (! ((*info->callbacks->reloc_overflow)
7106 (info, sym_name, howto->name, addend,
7107 (bfd *) NULL, (asection *) NULL, (bfd_vma) 0)))
7114 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
7115 (file_ptr) link_order->offset, size);
7121 /* The address of a reloc is relative to the section in a
7122 relocateable file, and is a virtual address in an executable
7124 offset = link_order->offset;
7125 if (! info->relocateable)
7126 offset += output_section->vma;
7128 rel_hdr = &elf_section_data (output_section)->rel_hdr;
7130 if (rel_hdr->sh_type == SHT_REL)
7133 Elf_Internal_Rel *irel;
7134 Elf_External_Rel *erel;
7137 size = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
7138 irel = (Elf_Internal_Rel *) bfd_zmalloc (size);
7142 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7143 irel[i].r_offset = offset;
7144 irel[0].r_info = ELF_R_INFO (indx, howto->type);
7146 erel = ((Elf_External_Rel *) rel_hdr->contents
7147 + elf_section_data (output_section)->rel_count);
7149 if (bed->s->swap_reloc_out)
7150 (*bed->s->swap_reloc_out) (output_bfd, irel, (bfd_byte *) erel);
7152 elf_swap_reloc_out (output_bfd, irel, erel);
7159 Elf_Internal_Rela *irela;
7160 Elf_External_Rela *erela;
7163 size = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
7164 irela = (Elf_Internal_Rela *) bfd_zmalloc (size);
7168 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7169 irela[i].r_offset = offset;
7170 irela[0].r_info = ELF_R_INFO (indx, howto->type);
7171 irela[0].r_addend = addend;
7173 erela = ((Elf_External_Rela *) rel_hdr->contents
7174 + elf_section_data (output_section)->rel_count);
7176 if (bed->s->swap_reloca_out)
7177 (*bed->s->swap_reloca_out) (output_bfd, irela, (bfd_byte *) erela);
7179 elf_swap_reloca_out (output_bfd, irela, erela);
7182 ++elf_section_data (output_section)->rel_count;
7187 /* Allocate a pointer to live in a linker created section. */
7190 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
7192 struct bfd_link_info *info;
7193 elf_linker_section_t *lsect;
7194 struct elf_link_hash_entry *h;
7195 const Elf_Internal_Rela *rel;
7197 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
7198 elf_linker_section_pointers_t *linker_section_ptr;
7199 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
7202 BFD_ASSERT (lsect != NULL);
7204 /* Is this a global symbol? */
7207 /* Has this symbol already been allocated? If so, our work is done. */
7208 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
7213 ptr_linker_section_ptr = &h->linker_section_pointer;
7214 /* Make sure this symbol is output as a dynamic symbol. */
7215 if (h->dynindx == -1)
7217 if (! elf_link_record_dynamic_symbol (info, h))
7221 if (lsect->rel_section)
7222 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
7226 /* Allocation of a pointer to a local symbol. */
7227 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
7229 /* Allocate a table to hold the local symbols if first time. */
7232 unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
7233 register unsigned int i;
7236 amt *= sizeof (elf_linker_section_pointers_t *);
7237 ptr = (elf_linker_section_pointers_t **) bfd_alloc (abfd, amt);
7242 elf_local_ptr_offsets (abfd) = ptr;
7243 for (i = 0; i < num_symbols; i++)
7244 ptr[i] = (elf_linker_section_pointers_t *) 0;
7247 /* Has this symbol already been allocated? If so, our work is done. */
7248 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
7253 ptr_linker_section_ptr = &ptr[r_symndx];
7257 /* If we are generating a shared object, we need to
7258 output a R_<xxx>_RELATIVE reloc so that the
7259 dynamic linker can adjust this GOT entry. */
7260 BFD_ASSERT (lsect->rel_section != NULL);
7261 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
7265 /* Allocate space for a pointer in the linker section, and allocate
7266 a new pointer record from internal memory. */
7267 BFD_ASSERT (ptr_linker_section_ptr != NULL);
7268 amt = sizeof (elf_linker_section_pointers_t);
7269 linker_section_ptr = (elf_linker_section_pointers_t *) bfd_alloc (abfd, amt);
7271 if (!linker_section_ptr)
7274 linker_section_ptr->next = *ptr_linker_section_ptr;
7275 linker_section_ptr->addend = rel->r_addend;
7276 linker_section_ptr->which = lsect->which;
7277 linker_section_ptr->written_address_p = false;
7278 *ptr_linker_section_ptr = linker_section_ptr;
7281 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
7283 linker_section_ptr->offset = (lsect->section->_raw_size
7284 - lsect->hole_size + (ARCH_SIZE / 8));
7285 lsect->hole_offset += ARCH_SIZE / 8;
7286 lsect->sym_offset += ARCH_SIZE / 8;
7287 if (lsect->sym_hash)
7289 /* Bump up symbol value if needed. */
7290 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
7292 fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
7293 lsect->sym_hash->root.root.string,
7294 (long) ARCH_SIZE / 8,
7295 (long) lsect->sym_hash->root.u.def.value);
7301 linker_section_ptr->offset = lsect->section->_raw_size;
7303 lsect->section->_raw_size += ARCH_SIZE / 8;
7307 "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
7308 lsect->name, (long) linker_section_ptr->offset,
7309 (long) lsect->section->_raw_size);
7316 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
7319 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
7322 /* Fill in the address for a pointer generated in a linker section. */
7325 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h,
7326 relocation, rel, relative_reloc)
7329 struct bfd_link_info *info;
7330 elf_linker_section_t *lsect;
7331 struct elf_link_hash_entry *h;
7333 const Elf_Internal_Rela *rel;
7336 elf_linker_section_pointers_t *linker_section_ptr;
7338 BFD_ASSERT (lsect != NULL);
7342 /* Handle global symbol. */
7343 linker_section_ptr = (_bfd_elf_find_pointer_linker_section
7344 (h->linker_section_pointer,
7348 BFD_ASSERT (linker_section_ptr != NULL);
7350 if (! elf_hash_table (info)->dynamic_sections_created
7353 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
7355 /* This is actually a static link, or it is a
7356 -Bsymbolic link and the symbol is defined
7357 locally. We must initialize this entry in the
7360 When doing a dynamic link, we create a .rela.<xxx>
7361 relocation entry to initialize the value. This
7362 is done in the finish_dynamic_symbol routine. */
7363 if (!linker_section_ptr->written_address_p)
7365 linker_section_ptr->written_address_p = true;
7366 bfd_put_ptr (output_bfd,
7367 relocation + linker_section_ptr->addend,
7368 (lsect->section->contents
7369 + linker_section_ptr->offset));
7375 /* Handle local symbol. */
7376 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
7377 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
7378 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
7379 linker_section_ptr = (_bfd_elf_find_pointer_linker_section
7380 (elf_local_ptr_offsets (input_bfd)[r_symndx],
7384 BFD_ASSERT (linker_section_ptr != NULL);
7386 /* Write out pointer if it hasn't been rewritten out before. */
7387 if (!linker_section_ptr->written_address_p)
7389 linker_section_ptr->written_address_p = true;
7390 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
7391 lsect->section->contents + linker_section_ptr->offset);
7395 asection *srel = lsect->rel_section;
7396 Elf_Internal_Rela *outrel;
7397 Elf_External_Rela *erel;
7398 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
7402 amt = sizeof (Elf_Internal_Rela) * bed->s->int_rels_per_ext_rel;
7403 outrel = (Elf_Internal_Rela *) bfd_zmalloc (amt);
7406 (*_bfd_error_handler) (_("Error: out of memory"));
7410 /* We need to generate a relative reloc for the dynamic
7414 srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
7416 lsect->rel_section = srel;
7419 BFD_ASSERT (srel != NULL);
7421 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7422 outrel[i].r_offset = (lsect->section->output_section->vma
7423 + lsect->section->output_offset
7424 + linker_section_ptr->offset);
7425 outrel[0].r_info = ELF_R_INFO (0, relative_reloc);
7426 outrel[0].r_addend = 0;
7427 erel = (Elf_External_Rela *) lsect->section->contents;
7428 erel += elf_section_data (lsect->section)->rel_count;
7429 elf_swap_reloca_out (output_bfd, outrel, erel);
7430 ++elf_section_data (lsect->section)->rel_count;
7437 relocation = (lsect->section->output_offset
7438 + linker_section_ptr->offset
7439 - lsect->hole_offset
7440 - lsect->sym_offset);
7444 "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
7445 lsect->name, (long) relocation, (long) relocation);
7448 /* Subtract out the addend, because it will get added back in by the normal
7450 return relocation - linker_section_ptr->addend;
7453 /* Garbage collect unused sections. */
7455 static boolean elf_gc_mark
7456 PARAMS ((struct bfd_link_info *info, asection *sec,
7457 asection * (*gc_mark_hook)
7458 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
7459 struct elf_link_hash_entry *, Elf_Internal_Sym *))));
7461 static boolean elf_gc_sweep
7462 PARAMS ((struct bfd_link_info *info,
7463 boolean (*gc_sweep_hook)
7464 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
7465 const Elf_Internal_Rela *relocs))));
7467 static boolean elf_gc_sweep_symbol
7468 PARAMS ((struct elf_link_hash_entry *h, PTR idxptr));
7470 static boolean elf_gc_allocate_got_offsets
7471 PARAMS ((struct elf_link_hash_entry *h, PTR offarg));
7473 static boolean elf_gc_propagate_vtable_entries_used
7474 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
7476 static boolean elf_gc_smash_unused_vtentry_relocs
7477 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
7479 /* The mark phase of garbage collection. For a given section, mark
7480 it and any sections in this section's group, and all the sections
7481 which define symbols to which it refers. */
7484 elf_gc_mark (info, sec, gc_mark_hook)
7485 struct bfd_link_info *info;
7487 asection * (*gc_mark_hook)
7488 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
7489 struct elf_link_hash_entry *, Elf_Internal_Sym *));
7492 asection *group_sec;
7496 /* Mark all the sections in the group. */
7497 group_sec = elf_section_data (sec)->next_in_group;
7498 if (group_sec && !group_sec->gc_mark)
7499 if (!elf_gc_mark (info, group_sec, gc_mark_hook))
7502 /* Look through the section relocs. */
7504 if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
7506 Elf_Internal_Rela *relstart, *rel, *relend;
7507 Elf_Internal_Shdr *symtab_hdr;
7508 Elf_Internal_Shdr *shndx_hdr;
7509 struct elf_link_hash_entry **sym_hashes;
7512 Elf_External_Sym *locsyms, *freesyms = NULL;
7513 Elf_External_Sym_Shndx *locsym_shndx;
7514 bfd *input_bfd = sec->owner;
7515 struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
7517 /* GCFIXME: how to arrange so that relocs and symbols are not
7518 reread continually? */
7520 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
7521 sym_hashes = elf_sym_hashes (input_bfd);
7523 /* Read the local symbols. */
7524 if (elf_bad_symtab (input_bfd))
7526 nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
7530 extsymoff = nlocsyms = symtab_hdr->sh_info;
7532 if (symtab_hdr->contents)
7533 locsyms = (Elf_External_Sym *) symtab_hdr->contents;
7534 else if (nlocsyms == 0)
7538 bfd_size_type amt = nlocsyms * sizeof (Elf_External_Sym);
7539 locsyms = freesyms = bfd_malloc (amt);
7540 if (freesyms == NULL
7541 || bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
7542 || bfd_bread (locsyms, amt, input_bfd) != amt)
7549 shndx_hdr = &elf_tdata (input_bfd)->symtab_shndx_hdr;
7550 locsym_shndx = NULL;
7551 if (shndx_hdr->sh_size != 0 && nlocsyms != 0)
7553 bfd_size_type amt = nlocsyms * sizeof (Elf_External_Sym_Shndx);
7554 locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
7555 if (bfd_seek (input_bfd, shndx_hdr->sh_offset, SEEK_SET) != 0
7556 || bfd_bread (locsym_shndx, amt, input_bfd) != amt)
7560 /* Read the relocations. */
7561 relstart = (NAME(_bfd_elf,link_read_relocs)
7562 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL,
7563 info->keep_memory));
7564 if (relstart == NULL)
7569 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
7571 for (rel = relstart; rel < relend; rel++)
7573 unsigned long r_symndx;
7575 struct elf_link_hash_entry *h;
7578 r_symndx = ELF_R_SYM (rel->r_info);
7582 if (elf_bad_symtab (sec->owner))
7584 elf_swap_symbol_in (input_bfd,
7586 locsym_shndx + (locsym_shndx ? r_symndx : 0),
7588 if (ELF_ST_BIND (s.st_info) == STB_LOCAL)
7589 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
7592 h = sym_hashes[r_symndx - extsymoff];
7593 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
7596 else if (r_symndx >= nlocsyms)
7598 h = sym_hashes[r_symndx - extsymoff];
7599 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
7603 elf_swap_symbol_in (input_bfd,
7605 locsym_shndx + (locsym_shndx ? r_symndx : 0),
7607 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
7610 if (rsec && !rsec->gc_mark)
7612 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
7614 else if (!elf_gc_mark (info, rsec, gc_mark_hook))
7623 if (!info->keep_memory)
7633 /* The sweep phase of garbage collection. Remove all garbage sections. */
7636 elf_gc_sweep (info, gc_sweep_hook)
7637 struct bfd_link_info *info;
7638 boolean (*gc_sweep_hook)
7639 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
7640 const Elf_Internal_Rela *relocs));
7644 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
7648 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
7651 for (o = sub->sections; o != NULL; o = o->next)
7653 /* Keep special sections. Keep .debug sections. */
7654 if ((o->flags & SEC_LINKER_CREATED)
7655 || (o->flags & SEC_DEBUGGING))
7661 /* Skip sweeping sections already excluded. */
7662 if (o->flags & SEC_EXCLUDE)
7665 /* Since this is early in the link process, it is simple
7666 to remove a section from the output. */
7667 o->flags |= SEC_EXCLUDE;
7669 /* But we also have to update some of the relocation
7670 info we collected before. */
7672 && (o->flags & SEC_RELOC) && o->reloc_count > 0)
7674 Elf_Internal_Rela *internal_relocs;
7677 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
7678 (o->owner, o, NULL, NULL, info->keep_memory));
7679 if (internal_relocs == NULL)
7682 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
7684 if (!info->keep_memory)
7685 free (internal_relocs);
7693 /* Remove the symbols that were in the swept sections from the dynamic
7694 symbol table. GCFIXME: Anyone know how to get them out of the
7695 static symbol table as well? */
7699 elf_link_hash_traverse (elf_hash_table (info),
7700 elf_gc_sweep_symbol,
7703 elf_hash_table (info)->dynsymcount = i;
7709 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
7712 elf_gc_sweep_symbol (h, idxptr)
7713 struct elf_link_hash_entry *h;
7716 int *idx = (int *) idxptr;
7718 if (h->root.type == bfd_link_hash_warning)
7719 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7721 if (h->dynindx != -1
7722 && ((h->root.type != bfd_link_hash_defined
7723 && h->root.type != bfd_link_hash_defweak)
7724 || h->root.u.def.section->gc_mark))
7725 h->dynindx = (*idx)++;
7730 /* Propogate collected vtable information. This is called through
7731 elf_link_hash_traverse. */
7734 elf_gc_propagate_vtable_entries_used (h, okp)
7735 struct elf_link_hash_entry *h;
7738 if (h->root.type == bfd_link_hash_warning)
7739 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7741 /* Those that are not vtables. */
7742 if (h->vtable_parent == NULL)
7745 /* Those vtables that do not have parents, we cannot merge. */
7746 if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
7749 /* If we've already been done, exit. */
7750 if (h->vtable_entries_used && h->vtable_entries_used[-1])
7753 /* Make sure the parent's table is up to date. */
7754 elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
7756 if (h->vtable_entries_used == NULL)
7758 /* None of this table's entries were referenced. Re-use the
7760 h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
7761 h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
7768 /* Or the parent's entries into ours. */
7769 cu = h->vtable_entries_used;
7771 pu = h->vtable_parent->vtable_entries_used;
7774 asection *sec = h->root.u.def.section;
7775 struct elf_backend_data *bed = get_elf_backend_data (sec->owner);
7776 int file_align = bed->s->file_align;
7778 n = h->vtable_parent->vtable_entries_size / file_align;
7793 elf_gc_smash_unused_vtentry_relocs (h, okp)
7794 struct elf_link_hash_entry *h;
7798 bfd_vma hstart, hend;
7799 Elf_Internal_Rela *relstart, *relend, *rel;
7800 struct elf_backend_data *bed;
7803 if (h->root.type == bfd_link_hash_warning)
7804 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7806 /* Take care of both those symbols that do not describe vtables as
7807 well as those that are not loaded. */
7808 if (h->vtable_parent == NULL)
7811 BFD_ASSERT (h->root.type == bfd_link_hash_defined
7812 || h->root.type == bfd_link_hash_defweak);
7814 sec = h->root.u.def.section;
7815 hstart = h->root.u.def.value;
7816 hend = hstart + h->size;
7818 relstart = (NAME(_bfd_elf,link_read_relocs)
7819 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true));
7821 return *(boolean *) okp = false;
7822 bed = get_elf_backend_data (sec->owner);
7823 file_align = bed->s->file_align;
7825 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
7827 for (rel = relstart; rel < relend; ++rel)
7828 if (rel->r_offset >= hstart && rel->r_offset < hend)
7830 /* If the entry is in use, do nothing. */
7831 if (h->vtable_entries_used
7832 && (rel->r_offset - hstart) < h->vtable_entries_size)
7834 bfd_vma entry = (rel->r_offset - hstart) / file_align;
7835 if (h->vtable_entries_used[entry])
7838 /* Otherwise, kill it. */
7839 rel->r_offset = rel->r_info = rel->r_addend = 0;
7845 /* Do mark and sweep of unused sections. */
7848 elf_gc_sections (abfd, info)
7850 struct bfd_link_info *info;
7854 asection * (*gc_mark_hook)
7855 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
7856 struct elf_link_hash_entry *h, Elf_Internal_Sym *));
7858 if (!get_elf_backend_data (abfd)->can_gc_sections
7859 || info->relocateable || info->emitrelocations
7860 || elf_hash_table (info)->dynamic_sections_created)
7863 /* Apply transitive closure to the vtable entry usage info. */
7864 elf_link_hash_traverse (elf_hash_table (info),
7865 elf_gc_propagate_vtable_entries_used,
7870 /* Kill the vtable relocations that were not used. */
7871 elf_link_hash_traverse (elf_hash_table (info),
7872 elf_gc_smash_unused_vtentry_relocs,
7877 /* Grovel through relocs to find out who stays ... */
7879 gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
7880 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
7884 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
7887 for (o = sub->sections; o != NULL; o = o->next)
7889 if (o->flags & SEC_KEEP)
7890 if (!elf_gc_mark (info, o, gc_mark_hook))
7895 /* ... and mark SEC_EXCLUDE for those that go. */
7896 if (!elf_gc_sweep (info, get_elf_backend_data (abfd)->gc_sweep_hook))
7902 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
7905 elf_gc_record_vtinherit (abfd, sec, h, offset)
7908 struct elf_link_hash_entry *h;
7911 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
7912 struct elf_link_hash_entry **search, *child;
7913 bfd_size_type extsymcount;
7915 /* The sh_info field of the symtab header tells us where the
7916 external symbols start. We don't care about the local symbols at
7918 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
7919 if (!elf_bad_symtab (abfd))
7920 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
7922 sym_hashes = elf_sym_hashes (abfd);
7923 sym_hashes_end = sym_hashes + extsymcount;
7925 /* Hunt down the child symbol, which is in this section at the same
7926 offset as the relocation. */
7927 for (search = sym_hashes; search != sym_hashes_end; ++search)
7929 if ((child = *search) != NULL
7930 && (child->root.type == bfd_link_hash_defined
7931 || child->root.type == bfd_link_hash_defweak)
7932 && child->root.u.def.section == sec
7933 && child->root.u.def.value == offset)
7937 (*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
7938 bfd_archive_filename (abfd), sec->name,
7939 (unsigned long) offset);
7940 bfd_set_error (bfd_error_invalid_operation);
7946 /* This *should* only be the absolute section. It could potentially
7947 be that someone has defined a non-global vtable though, which
7948 would be bad. It isn't worth paging in the local symbols to be
7949 sure though; that case should simply be handled by the assembler. */
7951 child->vtable_parent = (struct elf_link_hash_entry *) -1;
7954 child->vtable_parent = h;
7959 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
7962 elf_gc_record_vtentry (abfd, sec, h, addend)
7963 bfd *abfd ATTRIBUTE_UNUSED;
7964 asection *sec ATTRIBUTE_UNUSED;
7965 struct elf_link_hash_entry *h;
7968 struct elf_backend_data *bed = get_elf_backend_data (abfd);
7969 int file_align = bed->s->file_align;
7971 if (addend >= h->vtable_entries_size)
7974 boolean *ptr = h->vtable_entries_used;
7976 /* While the symbol is undefined, we have to be prepared to handle
7978 if (h->root.type == bfd_link_hash_undefined)
7985 /* Oops! We've got a reference past the defined end of
7986 the table. This is probably a bug -- shall we warn? */
7991 /* Allocate one extra entry for use as a "done" flag for the
7992 consolidation pass. */
7993 bytes = (size / file_align + 1) * sizeof (boolean);
7997 ptr = bfd_realloc (ptr - 1, (bfd_size_type) bytes);
8003 oldbytes = ((h->vtable_entries_size / file_align + 1)
8004 * sizeof (boolean));
8005 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
8009 ptr = bfd_zmalloc ((bfd_size_type) bytes);
8014 /* And arrange for that done flag to be at index -1. */
8015 h->vtable_entries_used = ptr + 1;
8016 h->vtable_entries_size = size;
8019 h->vtable_entries_used[addend / file_align] = true;
8024 /* And an accompanying bit to work out final got entry offsets once
8025 we're done. Should be called from final_link. */
8028 elf_gc_common_finalize_got_offsets (abfd, info)
8030 struct bfd_link_info *info;
8033 struct elf_backend_data *bed = get_elf_backend_data (abfd);
8036 /* The GOT offset is relative to the .got section, but the GOT header is
8037 put into the .got.plt section, if the backend uses it. */
8038 if (bed->want_got_plt)
8041 gotoff = bed->got_header_size;
8043 /* Do the local .got entries first. */
8044 for (i = info->input_bfds; i; i = i->link_next)
8046 bfd_signed_vma *local_got;
8047 bfd_size_type j, locsymcount;
8048 Elf_Internal_Shdr *symtab_hdr;
8050 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
8053 local_got = elf_local_got_refcounts (i);
8057 symtab_hdr = &elf_tdata (i)->symtab_hdr;
8058 if (elf_bad_symtab (i))
8059 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
8061 locsymcount = symtab_hdr->sh_info;
8063 for (j = 0; j < locsymcount; ++j)
8065 if (local_got[j] > 0)
8067 local_got[j] = gotoff;
8068 gotoff += ARCH_SIZE / 8;
8071 local_got[j] = (bfd_vma) -1;
8075 /* Then the global .got entries. .plt refcounts are handled by
8076 adjust_dynamic_symbol */
8077 elf_link_hash_traverse (elf_hash_table (info),
8078 elf_gc_allocate_got_offsets,
8083 /* We need a special top-level link routine to convert got reference counts
8084 to real got offsets. */
8087 elf_gc_allocate_got_offsets (h, offarg)
8088 struct elf_link_hash_entry *h;
8091 bfd_vma *off = (bfd_vma *) offarg;
8093 if (h->root.type == bfd_link_hash_warning)
8094 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8096 if (h->got.refcount > 0)
8098 h->got.offset = off[0];
8099 off[0] += ARCH_SIZE / 8;
8102 h->got.offset = (bfd_vma) -1;
8107 /* Many folk need no more in the way of final link than this, once
8108 got entry reference counting is enabled. */
8111 elf_gc_common_final_link (abfd, info)
8113 struct bfd_link_info *info;
8115 if (!elf_gc_common_finalize_got_offsets (abfd, info))
8118 /* Invoke the regular ELF backend linker to do all the work. */
8119 return elf_bfd_final_link (abfd, info);
8122 /* This function will be called though elf_link_hash_traverse to store
8123 all hash value of the exported symbols in an array. */
8126 elf_collect_hash_codes (h, data)
8127 struct elf_link_hash_entry *h;
8130 unsigned long **valuep = (unsigned long **) data;
8136 if (h->root.type == bfd_link_hash_warning)
8137 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8139 /* Ignore indirect symbols. These are added by the versioning code. */
8140 if (h->dynindx == -1)
8143 name = h->root.root.string;
8144 p = strchr (name, ELF_VER_CHR);
8147 alc = bfd_malloc ((bfd_size_type) (p - name + 1));
8148 memcpy (alc, name, (size_t) (p - name));
8149 alc[p - name] = '\0';
8153 /* Compute the hash value. */
8154 ha = bfd_elf_hash (name);
8156 /* Store the found hash value in the array given as the argument. */
8159 /* And store it in the struct so that we can put it in the hash table
8161 h->elf_hash_value = ha;
8170 elf_reloc_symbol_deleted_p (offset, cookie)
8174 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
8176 if (rcookie->bad_symtab)
8177 rcookie->rel = rcookie->rels;
8179 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
8181 unsigned long r_symndx = ELF_R_SYM (rcookie->rel->r_info);
8182 Elf_Internal_Sym isym;
8184 if (! rcookie->bad_symtab)
8185 if (rcookie->rel->r_offset > offset)
8187 if (rcookie->rel->r_offset != offset)
8190 if (rcookie->locsyms && r_symndx < rcookie->locsymcount)
8192 Elf_External_Sym *lsym;
8193 Elf_External_Sym_Shndx *lshndx;
8195 lsym = (Elf_External_Sym *) rcookie->locsyms + r_symndx;
8196 lshndx = (Elf_External_Sym_Shndx *) rcookie->locsym_shndx;
8199 elf_swap_symbol_in (rcookie->abfd, lsym, lshndx, &isym);
8202 if (r_symndx >= rcookie->locsymcount
8203 || (rcookie->locsyms
8204 && ELF_ST_BIND (isym.st_info) != STB_LOCAL))
8206 struct elf_link_hash_entry *h;
8208 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
8210 while (h->root.type == bfd_link_hash_indirect
8211 || h->root.type == bfd_link_hash_warning)
8212 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8214 if ((h->root.type == bfd_link_hash_defined
8215 || h->root.type == bfd_link_hash_defweak)
8216 && elf_discarded_section (h->root.u.def.section))
8221 else if (rcookie->locsyms)
8223 /* It's not a relocation against a global symbol,
8224 but it could be a relocation against a local
8225 symbol for a discarded section. */
8228 /* Need to: get the symbol; get the section. */
8229 if (isym.st_shndx < SHN_LORESERVE || isym.st_shndx > SHN_HIRESERVE)
8231 isec = section_from_elf_index (rcookie->abfd, isym.st_shndx);
8232 if (isec != NULL && elf_discarded_section (isec))
8241 /* Discard unneeded references to discarded sections.
8242 Returns true if any section's size was changed. */
8243 /* This function assumes that the relocations are in sorted order,
8244 which is true for all known assemblers. */
8247 elf_bfd_discard_info (output_bfd, info)
8249 struct bfd_link_info *info;
8251 struct elf_reloc_cookie cookie;
8252 asection *stab, *eh, *ehdr;
8253 Elf_Internal_Shdr *symtab_hdr;
8254 Elf_Internal_Shdr *shndx_hdr;
8255 Elf_External_Sym *freesyms;
8256 struct elf_backend_data *bed;
8258 boolean ret = false;
8259 boolean strip = info->strip == strip_all || info->strip == strip_debugger;
8261 if (info->relocateable
8262 || info->traditional_format
8263 || info->hash->creator->flavour != bfd_target_elf_flavour
8264 || ! is_elf_hash_table (info))
8268 if (elf_hash_table (info)->dynobj != NULL)
8269 ehdr = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
8272 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
8274 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
8277 bed = get_elf_backend_data (abfd);
8279 if ((abfd->flags & DYNAMIC) != 0)
8285 eh = bfd_get_section_by_name (abfd, ".eh_frame");
8286 if (eh && (eh->_raw_size == 0
8287 || bfd_is_abs_section (eh->output_section)))
8294 stab = bfd_get_section_by_name (abfd, ".stab");
8295 if (stab && (stab->_raw_size == 0
8296 || bfd_is_abs_section (stab->output_section)))
8300 || elf_section_data(stab)->sec_info_type != ELF_INFO_TYPE_STABS)
8302 && (strip || ! bed->elf_backend_discard_info))
8305 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8306 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
8309 cookie.sym_hashes = elf_sym_hashes (abfd);
8310 cookie.bad_symtab = elf_bad_symtab (abfd);
8311 if (cookie.bad_symtab)
8313 cookie.locsymcount =
8314 symtab_hdr->sh_size / sizeof (Elf_External_Sym);
8315 cookie.extsymoff = 0;
8319 cookie.locsymcount = symtab_hdr->sh_info;
8320 cookie.extsymoff = symtab_hdr->sh_info;
8324 if (symtab_hdr->contents)
8325 cookie.locsyms = (void *) symtab_hdr->contents;
8326 else if (cookie.locsymcount == 0)
8327 cookie.locsyms = NULL;
8330 bfd_size_type amt = cookie.locsymcount * sizeof (Elf_External_Sym);
8331 cookie.locsyms = bfd_malloc (amt);
8332 if (cookie.locsyms == NULL)
8334 freesyms = cookie.locsyms;
8335 if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
8336 || bfd_bread (cookie.locsyms, amt, abfd) != amt)
8339 free (cookie.locsyms);
8344 cookie.locsym_shndx = NULL;
8345 if (shndx_hdr->sh_size != 0 && cookie.locsymcount != 0)
8348 amt = cookie.locsymcount * sizeof (Elf_External_Sym_Shndx);
8349 cookie.locsym_shndx = bfd_malloc (amt);
8350 if (cookie.locsym_shndx == NULL)
8351 goto error_ret_free_loc;
8352 if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0
8353 || bfd_bread (cookie.locsym_shndx, amt, abfd) != amt)
8355 free (cookie.locsym_shndx);
8356 goto error_ret_free_loc;
8362 cookie.rels = (NAME(_bfd_elf,link_read_relocs)
8363 (abfd, stab, (PTR) NULL,
8364 (Elf_Internal_Rela *) NULL,
8365 info->keep_memory));
8368 cookie.rel = cookie.rels;
8370 cookie.rels + stab->reloc_count * bed->s->int_rels_per_ext_rel;
8371 if (_bfd_discard_section_stabs (abfd, stab,
8372 elf_section_data (stab)->sec_info,
8373 elf_reloc_symbol_deleted_p,
8376 if (! info->keep_memory)
8385 cookie.relend = NULL;
8386 if (eh->reloc_count)
8387 cookie.rels = (NAME(_bfd_elf,link_read_relocs)
8388 (abfd, eh, (PTR) NULL, (Elf_Internal_Rela *) NULL,
8389 info->keep_memory));
8392 cookie.rel = cookie.rels;
8394 cookie.rels + eh->reloc_count * bed->s->int_rels_per_ext_rel;
8396 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh, ehdr,
8397 elf_reloc_symbol_deleted_p,
8400 if (! info->keep_memory)
8404 if (bed->elf_backend_discard_info)
8406 if (bed->elf_backend_discard_info (abfd, &cookie, info))
8410 if (cookie.locsym_shndx != NULL)
8411 free (cookie.locsym_shndx);
8413 if (freesyms != NULL)
8417 if (ehdr && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info, ehdr))
8423 elf_section_ignore_discarded_relocs (sec)
8426 struct elf_backend_data *bed;
8428 switch (elf_section_data (sec)->sec_info_type)
8430 case ELF_INFO_TYPE_STABS:
8431 case ELF_INFO_TYPE_EH_FRAME:
8437 bed = get_elf_backend_data (sec->owner);
8438 if (bed->elf_backend_ignore_discarded_relocs != NULL
8439 && (*bed->elf_backend_ignore_discarded_relocs) (sec))