2 Copyright 1995, 1996, 1997 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 /* This struct is used to pass information to routines called via
23 elf_link_hash_traverse which must return failure. */
25 struct elf_info_failed
28 struct bfd_link_info
*info
;
31 static boolean elf_link_add_object_symbols
32 PARAMS ((bfd
*, struct bfd_link_info
*));
33 static boolean elf_link_add_archive_symbols
34 PARAMS ((bfd
*, struct bfd_link_info
*));
35 static boolean elf_merge_symbol
36 PARAMS ((bfd
*, struct bfd_link_info
*, const char *, Elf_Internal_Sym
*,
37 asection
**, bfd_vma
*, struct elf_link_hash_entry
**,
38 boolean
*, boolean
*, boolean
*));
39 static boolean elf_export_symbol
40 PARAMS ((struct elf_link_hash_entry
*, PTR
));
41 static boolean elf_fix_symbol_flags
42 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
43 static boolean elf_adjust_dynamic_symbol
44 PARAMS ((struct elf_link_hash_entry
*, PTR
));
45 static boolean elf_link_find_version_dependencies
46 PARAMS ((struct elf_link_hash_entry
*, PTR
));
47 static boolean elf_link_find_version_dependencies
48 PARAMS ((struct elf_link_hash_entry
*, PTR
));
49 static boolean elf_link_assign_sym_version
50 PARAMS ((struct elf_link_hash_entry
*, PTR
));
51 static boolean elf_link_renumber_dynsyms
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
54 /* Given an ELF BFD, add symbols to the global hash table as
58 elf_bfd_link_add_symbols (abfd
, info
)
60 struct bfd_link_info
*info
;
62 switch (bfd_get_format (abfd
))
65 return elf_link_add_object_symbols (abfd
, info
);
67 return elf_link_add_archive_symbols (abfd
, info
);
69 bfd_set_error (bfd_error_wrong_format
);
75 /* Add symbols from an ELF archive file to the linker hash table. We
76 don't use _bfd_generic_link_add_archive_symbols because of a
77 problem which arises on UnixWare. The UnixWare libc.so is an
78 archive which includes an entry libc.so.1 which defines a bunch of
79 symbols. The libc.so archive also includes a number of other
80 object files, which also define symbols, some of which are the same
81 as those defined in libc.so.1. Correct linking requires that we
82 consider each object file in turn, and include it if it defines any
83 symbols we need. _bfd_generic_link_add_archive_symbols does not do
84 this; it looks through the list of undefined symbols, and includes
85 any object file which defines them. When this algorithm is used on
86 UnixWare, it winds up pulling in libc.so.1 early and defining a
87 bunch of symbols. This means that some of the other objects in the
88 archive are not included in the link, which is incorrect since they
89 precede libc.so.1 in the archive.
91 Fortunately, ELF archive handling is simpler than that done by
92 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
93 oddities. In ELF, if we find a symbol in the archive map, and the
94 symbol is currently undefined, we know that we must pull in that
97 Unfortunately, we do have to make multiple passes over the symbol
98 table until nothing further is resolved. */
101 elf_link_add_archive_symbols (abfd
, info
)
103 struct bfd_link_info
*info
;
106 boolean
*defined
= NULL
;
107 boolean
*included
= NULL
;
111 if (! bfd_has_map (abfd
))
113 /* An empty archive is a special case. */
114 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
116 bfd_set_error (bfd_error_no_armap
);
120 /* Keep track of all symbols we know to be already defined, and all
121 files we know to be already included. This is to speed up the
122 second and subsequent passes. */
123 c
= bfd_ardata (abfd
)->symdef_count
;
126 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
127 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
128 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
130 memset (defined
, 0, c
* sizeof (boolean
));
131 memset (included
, 0, c
* sizeof (boolean
));
133 symdefs
= bfd_ardata (abfd
)->symdefs
;
146 symdefend
= symdef
+ c
;
147 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
149 struct elf_link_hash_entry
*h
;
151 struct bfd_link_hash_entry
*undefs_tail
;
154 if (defined
[i
] || included
[i
])
156 if (symdef
->file_offset
== last
)
162 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
163 false, false, false);
169 /* If this is a default version (the name contains @@),
170 look up the symbol again without the version. The
171 effect is that references to the symbol without the
172 version will be matched by the default symbol in the
175 p
= strchr (symdef
->name
, ELF_VER_CHR
);
176 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
179 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
182 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
183 copy
[p
- symdef
->name
] = '\0';
185 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
186 false, false, false);
188 bfd_release (abfd
, copy
);
194 if (h
->root
.type
!= bfd_link_hash_undefined
)
196 if (h
->root
.type
!= bfd_link_hash_undefweak
)
201 /* We need to include this archive member. */
203 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
204 if (element
== (bfd
*) NULL
)
207 if (! bfd_check_format (element
, bfd_object
))
210 /* Doublecheck that we have not included this object
211 already--it should be impossible, but there may be
212 something wrong with the archive. */
213 if (element
->archive_pass
!= 0)
215 bfd_set_error (bfd_error_bad_value
);
218 element
->archive_pass
= 1;
220 undefs_tail
= info
->hash
->undefs_tail
;
222 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
225 if (! elf_link_add_object_symbols (element
, info
))
228 /* If there are any new undefined symbols, we need to make
229 another pass through the archive in order to see whether
230 they can be defined. FIXME: This isn't perfect, because
231 common symbols wind up on undefs_tail and because an
232 undefined symbol which is defined later on in this pass
233 does not require another pass. This isn't a bug, but it
234 does make the code less efficient than it could be. */
235 if (undefs_tail
!= info
->hash
->undefs_tail
)
238 /* Look backward to mark all symbols from this object file
239 which we have already seen in this pass. */
243 included
[mark
] = true;
248 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
250 /* We mark subsequent symbols from this object file as we go
251 on through the loop. */
252 last
= symdef
->file_offset
;
263 if (defined
!= (boolean
*) NULL
)
265 if (included
!= (boolean
*) NULL
)
270 /* This function is called when we want to define a new symbol. It
271 handles the various cases which arise when we find a definition in
272 a dynamic object, or when there is already a definition in a
273 dynamic object. The new symbol is described by NAME, SYM, PSEC,
274 and PVALUE. We set SYM_HASH to the hash table entry. We set
275 OVERRIDE if the old symbol is overriding a new definition. We set
276 TYPE_CHANGE_OK if it is OK for the type to change. We set
277 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
278 change, we mean that we shouldn't warn if the type or size does
282 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
283 override
, type_change_ok
, size_change_ok
)
285 struct bfd_link_info
*info
;
287 Elf_Internal_Sym
*sym
;
290 struct elf_link_hash_entry
**sym_hash
;
292 boolean
*type_change_ok
;
293 boolean
*size_change_ok
;
296 struct elf_link_hash_entry
*h
;
299 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
301 /* This code is for coping with dynamic objects, and is only useful
302 if we are doing an ELF link. */
303 if (info
->hash
->creator
!= abfd
->xvec
)
307 *type_change_ok
= false;
308 *size_change_ok
= false;
311 bind
= ELF_ST_BIND (sym
->st_info
);
313 if (! bfd_is_und_section (sec
))
314 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
316 h
= ((struct elf_link_hash_entry
*)
317 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
322 /* For merging, we only care about real symbols. */
324 while (h
->root
.type
== bfd_link_hash_indirect
325 || h
->root
.type
== bfd_link_hash_warning
)
326 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
328 /* If we just created the symbol, mark it as being an ELF symbol.
329 Other than that, there is nothing to do--there is no merge issue
330 with a newly defined symbol--so we just return. */
332 if (h
->root
.type
== bfd_link_hash_new
)
334 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
338 /* OLDBFD is a BFD associated with the existing symbol. */
340 switch (h
->root
.type
)
346 case bfd_link_hash_undefined
:
347 case bfd_link_hash_undefweak
:
348 oldbfd
= h
->root
.u
.undef
.abfd
;
351 case bfd_link_hash_defined
:
352 case bfd_link_hash_defweak
:
353 oldbfd
= h
->root
.u
.def
.section
->owner
;
356 case bfd_link_hash_common
:
357 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
361 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
362 respectively, is from a dynamic object. */
364 if ((abfd
->flags
& DYNAMIC
) != 0)
369 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
374 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
375 respectively, appear to be a definition rather than reference. */
377 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
382 if (h
->root
.type
== bfd_link_hash_undefined
383 || h
->root
.type
== bfd_link_hash_undefweak
384 || h
->root
.type
== bfd_link_hash_common
)
389 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
390 symbol, respectively, appears to be a common symbol in a dynamic
391 object. If a symbol appears in an uninitialized section, and is
392 not weak, and is not a function, then it may be a common symbol
393 which was resolved when the dynamic object was created. We want
394 to treat such symbols specially, because they raise special
395 considerations when setting the symbol size: if the symbol
396 appears as a common symbol in a regular object, and the size in
397 the regular object is larger, we must make sure that we use the
398 larger size. This problematic case can always be avoided in C,
399 but it must be handled correctly when using Fortran shared
402 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
403 likewise for OLDDYNCOMMON and OLDDEF.
405 Note that this test is just a heuristic, and that it is quite
406 possible to have an uninitialized symbol in a shared object which
407 is really a definition, rather than a common symbol. This could
408 lead to some minor confusion when the symbol really is a common
409 symbol in some regular object. However, I think it will be
414 && (sec
->flags
& SEC_ALLOC
) != 0
415 && (sec
->flags
& SEC_LOAD
) == 0
418 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
421 newdyncommon
= false;
425 && h
->root
.type
== bfd_link_hash_defined
426 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
427 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
428 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
430 && h
->type
!= STT_FUNC
)
433 olddyncommon
= false;
435 /* It's OK to change the type if either the existing symbol or the
436 new symbol is weak. */
438 if (h
->root
.type
== bfd_link_hash_defweak
439 || h
->root
.type
== bfd_link_hash_undefweak
441 *type_change_ok
= true;
443 /* It's OK to change the size if either the existing symbol or the
444 new symbol is weak, or if the old symbol is undefined. */
447 || h
->root
.type
== bfd_link_hash_undefined
)
448 *size_change_ok
= true;
450 /* If both the old and the new symbols look like common symbols in a
451 dynamic object, set the size of the symbol to the larger of the
456 && sym
->st_size
!= h
->size
)
458 /* Since we think we have two common symbols, issue a multiple
459 common warning if desired. Note that we only warn if the
460 size is different. If the size is the same, we simply let
461 the old symbol override the new one as normally happens with
462 symbols defined in dynamic objects. */
464 if (! ((*info
->callbacks
->multiple_common
)
465 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
466 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
469 if (sym
->st_size
> h
->size
)
470 h
->size
= sym
->st_size
;
472 *size_change_ok
= true;
475 /* If we are looking at a dynamic object, and we have found a
476 definition, we need to see if the symbol was already defined by
477 some other object. If so, we want to use the existing
478 definition, and we do not want to report a multiple symbol
479 definition error; we do this by clobbering *PSEC to be
482 We treat a common symbol as a definition if the symbol in the
483 shared library is a function, since common symbols always
484 represent variables; this can cause confusion in principle, but
485 any such confusion would seem to indicate an erroneous program or
486 shared library. We also permit a common symbol in a regular
487 object to override a weak symbol in a shared object. */
492 || (h
->root
.type
== bfd_link_hash_common
494 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
498 newdyncommon
= false;
500 *psec
= sec
= bfd_und_section_ptr
;
501 *size_change_ok
= true;
503 /* If we get here when the old symbol is a common symbol, then
504 we are explicitly letting it override a weak symbol or
505 function in a dynamic object, and we don't want to warn about
506 a type change. If the old symbol is a defined symbol, a type
507 change warning may still be appropriate. */
509 if (h
->root
.type
== bfd_link_hash_common
)
510 *type_change_ok
= true;
513 /* Handle the special case of an old common symbol merging with a
514 new symbol which looks like a common symbol in a shared object.
515 We change *PSEC and *PVALUE to make the new symbol look like a
516 common symbol, and let _bfd_generic_link_add_one_symbol will do
520 && h
->root
.type
== bfd_link_hash_common
)
524 newdyncommon
= false;
525 *pvalue
= sym
->st_size
;
526 *psec
= sec
= bfd_com_section_ptr
;
527 *size_change_ok
= true;
530 /* If the old symbol is from a dynamic object, and the new symbol is
531 a definition which is not from a dynamic object, then the new
532 symbol overrides the old symbol. Symbols from regular files
533 always take precedence over symbols from dynamic objects, even if
534 they are defined after the dynamic object in the link.
536 As above, we again permit a common symbol in a regular object to
537 override a definition in a shared object if the shared object
538 symbol is a function or is weak. */
542 || (bfd_is_com_section (sec
)
543 && (h
->root
.type
== bfd_link_hash_defweak
544 || h
->type
== STT_FUNC
)))
547 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
549 /* Change the hash table entry to undefined, and let
550 _bfd_generic_link_add_one_symbol do the right thing with the
553 h
->root
.type
= bfd_link_hash_undefined
;
554 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
555 *size_change_ok
= true;
558 olddyncommon
= false;
560 /* We again permit a type change when a common symbol may be
561 overriding a function. */
563 if (bfd_is_com_section (sec
))
564 *type_change_ok
= true;
566 /* This union may have been set to be non-NULL when this symbol
567 was seen in a dynamic object. We must force the union to be
568 NULL, so that it is correct for a regular symbol. */
570 h
->verinfo
.vertree
= NULL
;
572 /* In this special case, if H is the target of an indirection,
573 we want the caller to frob with H rather than with the
574 indirect symbol. That will permit the caller to redefine the
575 target of the indirection, rather than the indirect symbol
576 itself. FIXME: This will break the -y option if we store a
577 symbol with a different name. */
581 /* Handle the special case of a new common symbol merging with an
582 old symbol that looks like it might be a common symbol defined in
583 a shared object. Note that we have already handled the case in
584 which a new common symbol should simply override the definition
585 in the shared library. */
588 && bfd_is_com_section (sec
)
591 /* It would be best if we could set the hash table entry to a
592 common symbol, but we don't know what to use for the section
594 if (! ((*info
->callbacks
->multiple_common
)
595 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
596 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
599 /* If the predumed common symbol in the dynamic object is
600 larger, pretend that the new symbol has its size. */
602 if (h
->size
> *pvalue
)
605 /* FIXME: We no longer know the alignment required by the symbol
606 in the dynamic object, so we just wind up using the one from
607 the regular object. */
610 olddyncommon
= false;
612 h
->root
.type
= bfd_link_hash_undefined
;
613 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
615 *size_change_ok
= true;
616 *type_change_ok
= true;
618 h
->verinfo
.vertree
= NULL
;
624 /* Add symbols from an ELF object file to the linker hash table. */
627 elf_link_add_object_symbols (abfd
, info
)
629 struct bfd_link_info
*info
;
631 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
632 const Elf_Internal_Sym
*,
633 const char **, flagword
*,
634 asection
**, bfd_vma
*));
635 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
636 asection
*, const Elf_Internal_Rela
*));
638 Elf_Internal_Shdr
*hdr
;
642 Elf_External_Sym
*buf
= NULL
;
643 struct elf_link_hash_entry
**sym_hash
;
645 bfd_byte
*dynver
= NULL
;
646 Elf_External_Versym
*extversym
= NULL
;
647 Elf_External_Versym
*ever
;
648 Elf_External_Dyn
*dynbuf
= NULL
;
649 struct elf_link_hash_entry
*weaks
;
650 Elf_External_Sym
*esym
;
651 Elf_External_Sym
*esymend
;
653 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
654 collect
= get_elf_backend_data (abfd
)->collect
;
656 if ((abfd
->flags
& DYNAMIC
) == 0)
662 /* You can't use -r against a dynamic object. Also, there's no
663 hope of using a dynamic object which does not exactly match
664 the format of the output file. */
665 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
667 bfd_set_error (bfd_error_invalid_operation
);
672 /* As a GNU extension, any input sections which are named
673 .gnu.warning.SYMBOL are treated as warning symbols for the given
674 symbol. This differs from .gnu.warning sections, which generate
675 warnings when they are included in an output file. */
680 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
684 name
= bfd_get_section_name (abfd
, s
);
685 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
690 name
+= sizeof ".gnu.warning." - 1;
692 /* If this is a shared object, then look up the symbol
693 in the hash table. If it is there, and it is already
694 been defined, then we will not be using the entry
695 from this shared object, so we don't need to warn.
696 FIXME: If we see the definition in a regular object
697 later on, we will warn, but we shouldn't. The only
698 fix is to keep track of what warnings we are supposed
699 to emit, and then handle them all at the end of the
701 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
703 struct elf_link_hash_entry
*h
;
705 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
708 /* FIXME: What about bfd_link_hash_common? */
710 && (h
->root
.type
== bfd_link_hash_defined
711 || h
->root
.type
== bfd_link_hash_defweak
))
713 /* We don't want to issue this warning. Clobber
714 the section size so that the warning does not
715 get copied into the output file. */
721 sz
= bfd_section_size (abfd
, s
);
722 msg
= (char *) bfd_alloc (abfd
, sz
);
726 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
729 if (! (_bfd_generic_link_add_one_symbol
730 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
731 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
734 if (! info
->relocateable
)
736 /* Clobber the section size so that the warning does
737 not get copied into the output file. */
744 /* If this is a dynamic object, we always link against the .dynsym
745 symbol table, not the .symtab symbol table. The dynamic linker
746 will only see the .dynsym symbol table, so there is no reason to
747 look at .symtab for a dynamic object. */
749 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
750 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
752 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
756 /* Read in any version definitions. */
758 if (! _bfd_elf_slurp_version_tables (abfd
))
761 /* Read in the symbol versions, but don't bother to convert them
762 to internal format. */
763 if (elf_dynversym (abfd
) != 0)
765 Elf_Internal_Shdr
*versymhdr
;
767 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
768 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
769 if (extversym
== NULL
)
771 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
772 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
773 != versymhdr
->sh_size
))
778 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
780 /* The sh_info field of the symtab header tells us where the
781 external symbols start. We don't care about the local symbols at
783 if (elf_bad_symtab (abfd
))
785 extsymcount
= symcount
;
790 extsymcount
= symcount
- hdr
->sh_info
;
791 extsymoff
= hdr
->sh_info
;
794 buf
= ((Elf_External_Sym
*)
795 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
796 if (buf
== NULL
&& extsymcount
!= 0)
799 /* We store a pointer to the hash table entry for each external
801 sym_hash
= ((struct elf_link_hash_entry
**)
803 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
804 if (sym_hash
== NULL
)
806 elf_sym_hashes (abfd
) = sym_hash
;
810 /* If we are creating a shared library, create all the dynamic
811 sections immediately. We need to attach them to something,
812 so we attach them to this BFD, provided it is the right
813 format. FIXME: If there are no input BFD's of the same
814 format as the output, we can't make a shared library. */
816 && ! elf_hash_table (info
)->dynamic_sections_created
817 && abfd
->xvec
== info
->hash
->creator
)
819 if (! elf_link_create_dynamic_sections (abfd
, info
))
828 bfd_size_type oldsize
;
829 bfd_size_type strindex
;
831 /* Find the name to use in a DT_NEEDED entry that refers to this
832 object. If the object has a DT_SONAME entry, we use it.
833 Otherwise, if the generic linker stuck something in
834 elf_dt_name, we use that. Otherwise, we just use the file
835 name. If the generic linker put a null string into
836 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
837 there is a DT_SONAME entry. */
839 name
= bfd_get_filename (abfd
);
840 if (elf_dt_name (abfd
) != NULL
)
842 name
= elf_dt_name (abfd
);
846 s
= bfd_get_section_by_name (abfd
, ".dynamic");
849 Elf_External_Dyn
*extdyn
;
850 Elf_External_Dyn
*extdynend
;
854 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
858 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
859 (file_ptr
) 0, s
->_raw_size
))
862 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
865 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
868 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
869 for (; extdyn
< extdynend
; extdyn
++)
871 Elf_Internal_Dyn dyn
;
873 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
874 if (dyn
.d_tag
== DT_SONAME
)
876 name
= bfd_elf_string_from_elf_section (abfd
, link
,
881 if (dyn
.d_tag
== DT_NEEDED
)
883 struct bfd_link_needed_list
*n
, **pn
;
886 n
= ((struct bfd_link_needed_list
*)
887 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
888 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
890 if (n
== NULL
|| fnm
== NULL
)
892 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
899 for (pn
= &elf_hash_table (info
)->needed
;
911 /* We do not want to include any of the sections in a dynamic
912 object in the output file. We hack by simply clobbering the
913 list of sections in the BFD. This could be handled more
914 cleanly by, say, a new section flag; the existing
915 SEC_NEVER_LOAD flag is not the one we want, because that one
916 still implies that the section takes up space in the output
918 abfd
->sections
= NULL
;
919 abfd
->section_count
= 0;
921 /* If this is the first dynamic object found in the link, create
922 the special sections required for dynamic linking. */
923 if (! elf_hash_table (info
)->dynamic_sections_created
)
925 if (! elf_link_create_dynamic_sections (abfd
, info
))
931 /* Add a DT_NEEDED entry for this dynamic object. */
932 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
933 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
935 if (strindex
== (bfd_size_type
) -1)
938 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
941 Elf_External_Dyn
*dyncon
, *dynconend
;
943 /* The hash table size did not change, which means that
944 the dynamic object name was already entered. If we
945 have already included this dynamic object in the
946 link, just ignore it. There is no reason to include
947 a particular dynamic object more than once. */
948 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
950 BFD_ASSERT (sdyn
!= NULL
);
952 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
953 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
955 for (; dyncon
< dynconend
; dyncon
++)
957 Elf_Internal_Dyn dyn
;
959 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
961 if (dyn
.d_tag
== DT_NEEDED
962 && dyn
.d_un
.d_val
== strindex
)
966 if (extversym
!= NULL
)
973 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
977 /* Save the SONAME, if there is one, because sometimes the
978 linker emulation code will need to know it. */
980 name
= bfd_get_filename (abfd
);
981 elf_dt_name (abfd
) = name
;
985 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
987 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
988 != extsymcount
* sizeof (Elf_External_Sym
)))
993 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
994 esymend
= buf
+ extsymcount
;
997 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
999 Elf_Internal_Sym sym
;
1005 struct elf_link_hash_entry
*h
;
1007 boolean size_change_ok
, type_change_ok
;
1008 boolean new_weakdef
;
1009 unsigned int old_alignment
;
1011 elf_swap_symbol_in (abfd
, esym
, &sym
);
1013 flags
= BSF_NO_FLAGS
;
1015 value
= sym
.st_value
;
1018 bind
= ELF_ST_BIND (sym
.st_info
);
1019 if (bind
== STB_LOCAL
)
1021 /* This should be impossible, since ELF requires that all
1022 global symbols follow all local symbols, and that sh_info
1023 point to the first global symbol. Unfortunatealy, Irix 5
1027 else if (bind
== STB_GLOBAL
)
1029 if (sym
.st_shndx
!= SHN_UNDEF
1030 && sym
.st_shndx
!= SHN_COMMON
)
1035 else if (bind
== STB_WEAK
)
1039 /* Leave it up to the processor backend. */
1042 if (sym
.st_shndx
== SHN_UNDEF
)
1043 sec
= bfd_und_section_ptr
;
1044 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1046 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1048 sec
= bfd_abs_section_ptr
;
1049 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1052 else if (sym
.st_shndx
== SHN_ABS
)
1053 sec
= bfd_abs_section_ptr
;
1054 else if (sym
.st_shndx
== SHN_COMMON
)
1056 sec
= bfd_com_section_ptr
;
1057 /* What ELF calls the size we call the value. What ELF
1058 calls the value we call the alignment. */
1059 value
= sym
.st_size
;
1063 /* Leave it up to the processor backend. */
1066 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1067 if (name
== (const char *) NULL
)
1070 if (add_symbol_hook
)
1072 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1076 /* The hook function sets the name to NULL if this symbol
1077 should be skipped for some reason. */
1078 if (name
== (const char *) NULL
)
1082 /* Sanity check that all possibilities were handled. */
1083 if (sec
== (asection
*) NULL
)
1085 bfd_set_error (bfd_error_bad_value
);
1089 if (bfd_is_und_section (sec
)
1090 || bfd_is_com_section (sec
))
1095 size_change_ok
= false;
1096 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1098 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1100 Elf_Internal_Versym iver
;
1106 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1107 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1109 /* If this is a hidden symbol, or if it is not version
1110 1, we append the version name to the symbol name.
1111 However, we do not modify a non-hidden absolute
1112 symbol, because it might be the version symbol
1113 itself. FIXME: What if it isn't? */
1114 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1115 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1118 int namelen
, newlen
;
1121 if (sym
.st_shndx
!= SHN_UNDEF
)
1123 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1125 (*_bfd_error_handler
)
1126 ("%s: %s: invalid version %d (max %d)",
1127 abfd
->filename
, name
, vernum
,
1128 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1129 bfd_set_error (bfd_error_bad_value
);
1132 else if (vernum
> 1)
1134 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1140 /* We cannot simply test for the number of
1141 entries in the VERNEED section since the
1142 numbers for the needed versions do not start
1144 Elf_Internal_Verneed
*t
;
1147 for (t
= elf_tdata (abfd
)->verref
;
1151 Elf_Internal_Vernaux
*a
;
1153 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1155 if (a
->vna_other
== vernum
)
1157 verstr
= a
->vna_nodename
;
1166 (*_bfd_error_handler
)
1167 ("%s: %s: invalid needed version %d",
1168 abfd
->filename
, name
, vernum
);
1169 bfd_set_error (bfd_error_bad_value
);
1174 namelen
= strlen (name
);
1175 newlen
= namelen
+ strlen (verstr
) + 2;
1176 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1179 newname
= (char *) bfd_alloc (abfd
, newlen
);
1180 if (newname
== NULL
)
1182 strcpy (newname
, name
);
1183 p
= newname
+ namelen
;
1185 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1193 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1194 sym_hash
, &override
, &type_change_ok
,
1202 while (h
->root
.type
== bfd_link_hash_indirect
1203 || h
->root
.type
== bfd_link_hash_warning
)
1204 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1206 /* Remember the old alignment if this is a common symbol, so
1207 that we don't reduce the alignment later on. We can't
1208 check later, because _bfd_generic_link_add_one_symbol
1209 will set a default for the alignment which we want to
1211 if (h
->root
.type
== bfd_link_hash_common
)
1212 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1217 && (h
->verinfo
.verdef
== NULL
|| definition
))
1218 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1221 if (! (_bfd_generic_link_add_one_symbol
1222 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1223 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1227 while (h
->root
.type
== bfd_link_hash_indirect
1228 || h
->root
.type
== bfd_link_hash_warning
)
1229 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1232 new_weakdef
= false;
1235 && (flags
& BSF_WEAK
) != 0
1236 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1237 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1238 && h
->weakdef
== NULL
)
1240 /* Keep a list of all weak defined non function symbols from
1241 a dynamic object, using the weakdef field. Later in this
1242 function we will set the weakdef field to the correct
1243 value. We only put non-function symbols from dynamic
1244 objects on this list, because that happens to be the only
1245 time we need to know the normal symbol corresponding to a
1246 weak symbol, and the information is time consuming to
1247 figure out. If the weakdef field is not already NULL,
1248 then this symbol was already defined by some previous
1249 dynamic object, and we will be using that previous
1250 definition anyhow. */
1257 /* Set the alignment of a common symbol. */
1258 if (sym
.st_shndx
== SHN_COMMON
1259 && h
->root
.type
== bfd_link_hash_common
)
1263 align
= bfd_log2 (sym
.st_value
);
1264 if (align
> old_alignment
)
1265 h
->root
.u
.c
.p
->alignment_power
= align
;
1268 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1274 /* Remember the symbol size and type. */
1275 if (sym
.st_size
!= 0
1276 && (definition
|| h
->size
== 0))
1278 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1279 (*_bfd_error_handler
)
1280 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
1281 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1282 bfd_get_filename (abfd
));
1284 h
->size
= sym
.st_size
;
1287 /* If this is a common symbol, then we always want H->SIZE
1288 to be the size of the common symbol. The code just above
1289 won't fix the size if a common symbol becomes larger. We
1290 don't warn about a size change here, because that is
1291 covered by --warn-common. */
1292 if (h
->root
.type
== bfd_link_hash_common
)
1293 h
->size
= h
->root
.u
.c
.size
;
1295 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1296 && (definition
|| h
->type
== STT_NOTYPE
))
1298 if (h
->type
!= STT_NOTYPE
1299 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1300 && ! type_change_ok
)
1301 (*_bfd_error_handler
)
1302 ("Warning: type of symbol `%s' changed from %d to %d in %s",
1303 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1304 bfd_get_filename (abfd
));
1306 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1309 if (sym
.st_other
!= 0
1310 && (definition
|| h
->other
== 0))
1311 h
->other
= sym
.st_other
;
1313 /* Set a flag in the hash table entry indicating the type of
1314 reference or definition we just found. Keep a count of
1315 the number of dynamic symbols we find. A dynamic symbol
1316 is one which is referenced or defined by both a regular
1317 object and a shared object. */
1318 old_flags
= h
->elf_link_hash_flags
;
1323 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1325 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1327 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1328 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1334 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1336 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1337 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1338 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1339 || (h
->weakdef
!= NULL
1341 && h
->weakdef
->dynindx
!= -1))
1345 h
->elf_link_hash_flags
|= new_flag
;
1347 /* If this symbol has a version, and it is the default
1348 version, we create an indirect symbol from the default
1349 name to the fully decorated name. This will cause
1350 external references which do not specify a version to be
1351 bound to this version of the symbol. */
1356 p
= strchr (name
, ELF_VER_CHR
);
1357 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1360 struct elf_link_hash_entry
*hi
;
1363 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1365 if (shortname
== NULL
)
1367 strncpy (shortname
, name
, p
- name
);
1368 shortname
[p
- name
] = '\0';
1370 /* We are going to create a new symbol. Merge it
1371 with any existing symbol with this name. For the
1372 purposes of the merge, act as though we were
1373 defining the symbol we just defined, although we
1374 actually going to define an indirect symbol. */
1375 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1376 &value
, &hi
, &override
,
1377 &type_change_ok
, &size_change_ok
))
1382 if (! (_bfd_generic_link_add_one_symbol
1383 (info
, abfd
, shortname
, BSF_INDIRECT
,
1384 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1385 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1390 /* In this case the symbol named SHORTNAME is
1391 overriding the indirect symbol we want to
1392 add. We were planning on making SHORTNAME an
1393 indirect symbol referring to NAME. SHORTNAME
1394 is the name without a version. NAME is the
1395 fully versioned name, and it is the default
1398 Overriding means that we already saw a
1399 definition for the symbol SHORTNAME in a
1400 regular object, and it is overriding the
1401 symbol defined in the dynamic object.
1403 When this happens, we actually want to change
1404 NAME, the symbol we just added, to refer to
1405 SHORTNAME. This will cause references to
1406 NAME in the shared object to become
1407 references to SHORTNAME in the regular
1408 object. This is what we expect when we
1409 override a function in a shared object: that
1410 the references in the shared object will be
1411 mapped to the definition in the regular
1414 h
->root
.type
= bfd_link_hash_indirect
;
1415 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1416 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1418 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1419 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1420 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1424 /* Now set HI to H, so that the following code
1425 will set the other fields correctly. */
1429 /* If there is a duplicate definition somewhere,
1430 then HI may not point to an indirect symbol. We
1431 will have reported an error to the user in that
1434 if (hi
->root
.type
== bfd_link_hash_indirect
)
1436 struct elf_link_hash_entry
*ht
;
1438 /* If the symbol became indirect, then we assume
1439 that we have not seen a definition before. */
1440 BFD_ASSERT ((hi
->elf_link_hash_flags
1441 & (ELF_LINK_HASH_DEF_DYNAMIC
1442 | ELF_LINK_HASH_DEF_REGULAR
))
1445 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1447 /* Copy down any references that we may have
1448 already seen to the symbol which just became
1450 ht
->elf_link_hash_flags
|=
1451 (hi
->elf_link_hash_flags
1452 & (ELF_LINK_HASH_REF_DYNAMIC
1453 | ELF_LINK_HASH_REF_REGULAR
));
1455 /* Copy over the global table offset entry.
1456 This may have been already set up by a
1457 check_relocs routine. */
1458 if (ht
->got_offset
== (bfd_vma
) -1)
1460 ht
->got_offset
= hi
->got_offset
;
1461 hi
->got_offset
= (bfd_vma
) -1;
1463 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1465 if (ht
->dynindx
== -1)
1467 ht
->dynindx
= hi
->dynindx
;
1468 ht
->dynstr_index
= hi
->dynstr_index
;
1470 hi
->dynstr_index
= 0;
1472 BFD_ASSERT (hi
->dynindx
== -1);
1474 /* FIXME: There may be other information to copy
1475 over for particular targets. */
1477 /* See if the new flags lead us to realize that
1478 the symbol must be dynamic. */
1484 || ((hi
->elf_link_hash_flags
1485 & ELF_LINK_HASH_REF_DYNAMIC
)
1491 if ((hi
->elf_link_hash_flags
1492 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1498 /* We also need to define an indirection from the
1499 nondefault version of the symbol. */
1501 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1503 if (shortname
== NULL
)
1505 strncpy (shortname
, name
, p
- name
);
1506 strcpy (shortname
+ (p
- name
), p
+ 1);
1508 /* Once again, merge with any existing symbol. */
1509 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1510 &value
, &hi
, &override
,
1511 &type_change_ok
, &size_change_ok
))
1516 /* Here SHORTNAME is a versioned name, so we
1517 don't expect to see the type of override we
1518 do in the case above. */
1519 (*_bfd_error_handler
)
1520 ("%s: warning: unexpected redefinition of `%s'",
1521 bfd_get_filename (abfd
), shortname
);
1525 if (! (_bfd_generic_link_add_one_symbol
1526 (info
, abfd
, shortname
, BSF_INDIRECT
,
1527 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1528 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1531 /* If there is a duplicate definition somewhere,
1532 then HI may not point to an indirect symbol.
1533 We will have reported an error to the user in
1536 if (hi
->root
.type
== bfd_link_hash_indirect
)
1538 /* If the symbol became indirect, then we
1539 assume that we have not seen a definition
1541 BFD_ASSERT ((hi
->elf_link_hash_flags
1542 & (ELF_LINK_HASH_DEF_DYNAMIC
1543 | ELF_LINK_HASH_DEF_REGULAR
))
1546 /* Copy down any references that we may have
1547 already seen to the symbol which just
1549 h
->elf_link_hash_flags
|=
1550 (hi
->elf_link_hash_flags
1551 & (ELF_LINK_HASH_REF_DYNAMIC
1552 | ELF_LINK_HASH_REF_REGULAR
));
1554 /* Copy over the global table offset entry.
1555 This may have been already set up by a
1556 check_relocs routine. */
1557 if (h
->got_offset
== (bfd_vma
) -1)
1559 h
->got_offset
= hi
->got_offset
;
1560 hi
->got_offset
= (bfd_vma
) -1;
1562 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1564 if (h
->dynindx
== -1)
1566 h
->dynindx
= hi
->dynindx
;
1567 h
->dynstr_index
= hi
->dynstr_index
;
1569 hi
->dynstr_index
= 0;
1571 BFD_ASSERT (hi
->dynindx
== -1);
1573 /* FIXME: There may be other information to
1574 copy over for particular targets. */
1576 /* See if the new flags lead us to realize
1577 that the symbol must be dynamic. */
1583 || ((hi
->elf_link_hash_flags
1584 & ELF_LINK_HASH_REF_DYNAMIC
)
1590 if ((hi
->elf_link_hash_flags
1591 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1600 if (dynsym
&& h
->dynindx
== -1)
1602 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1604 if (h
->weakdef
!= NULL
1606 && h
->weakdef
->dynindx
== -1)
1608 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1616 /* Now set the weakdefs field correctly for all the weak defined
1617 symbols we found. The only way to do this is to search all the
1618 symbols. Since we only need the information for non functions in
1619 dynamic objects, that's the only time we actually put anything on
1620 the list WEAKS. We need this information so that if a regular
1621 object refers to a symbol defined weakly in a dynamic object, the
1622 real symbol in the dynamic object is also put in the dynamic
1623 symbols; we also must arrange for both symbols to point to the
1624 same memory location. We could handle the general case of symbol
1625 aliasing, but a general symbol alias can only be generated in
1626 assembler code, handling it correctly would be very time
1627 consuming, and other ELF linkers don't handle general aliasing
1629 while (weaks
!= NULL
)
1631 struct elf_link_hash_entry
*hlook
;
1634 struct elf_link_hash_entry
**hpp
;
1635 struct elf_link_hash_entry
**hppend
;
1638 weaks
= hlook
->weakdef
;
1639 hlook
->weakdef
= NULL
;
1641 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1642 || hlook
->root
.type
== bfd_link_hash_defweak
1643 || hlook
->root
.type
== bfd_link_hash_common
1644 || hlook
->root
.type
== bfd_link_hash_indirect
);
1645 slook
= hlook
->root
.u
.def
.section
;
1646 vlook
= hlook
->root
.u
.def
.value
;
1648 hpp
= elf_sym_hashes (abfd
);
1649 hppend
= hpp
+ extsymcount
;
1650 for (; hpp
< hppend
; hpp
++)
1652 struct elf_link_hash_entry
*h
;
1655 if (h
!= NULL
&& h
!= hlook
1656 && h
->root
.type
== bfd_link_hash_defined
1657 && h
->root
.u
.def
.section
== slook
1658 && h
->root
.u
.def
.value
== vlook
)
1662 /* If the weak definition is in the list of dynamic
1663 symbols, make sure the real definition is put there
1665 if (hlook
->dynindx
!= -1
1666 && h
->dynindx
== -1)
1668 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1672 /* If the real definition is in the list of dynamic
1673 symbols, make sure the weak definition is put there
1674 as well. If we don't do this, then the dynamic
1675 loader might not merge the entries for the real
1676 definition and the weak definition. */
1677 if (h
->dynindx
!= -1
1678 && hlook
->dynindx
== -1)
1680 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1695 if (extversym
!= NULL
)
1701 /* If this object is the same format as the output object, and it is
1702 not a shared library, then let the backend look through the
1705 This is required to build global offset table entries and to
1706 arrange for dynamic relocs. It is not required for the
1707 particular common case of linking non PIC code, even when linking
1708 against shared libraries, but unfortunately there is no way of
1709 knowing whether an object file has been compiled PIC or not.
1710 Looking through the relocs is not particularly time consuming.
1711 The problem is that we must either (1) keep the relocs in memory,
1712 which causes the linker to require additional runtime memory or
1713 (2) read the relocs twice from the input file, which wastes time.
1714 This would be a good case for using mmap.
1716 I have no idea how to handle linking PIC code into a file of a
1717 different format. It probably can't be done. */
1718 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1720 && abfd
->xvec
== info
->hash
->creator
1721 && check_relocs
!= NULL
)
1725 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1727 Elf_Internal_Rela
*internal_relocs
;
1730 if ((o
->flags
& SEC_RELOC
) == 0
1731 || o
->reloc_count
== 0
1732 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1733 && (o
->flags
& SEC_DEBUGGING
) != 0)
1734 || bfd_is_abs_section (o
->output_section
))
1737 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1738 (abfd
, o
, (PTR
) NULL
,
1739 (Elf_Internal_Rela
*) NULL
,
1740 info
->keep_memory
));
1741 if (internal_relocs
== NULL
)
1744 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1746 if (! info
->keep_memory
)
1747 free (internal_relocs
);
1754 /* If this is a non-traditional, non-relocateable link, try to
1755 optimize the handling of the .stab/.stabstr sections. */
1757 && ! info
->relocateable
1758 && ! info
->traditional_format
1759 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1760 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1762 asection
*stab
, *stabstr
;
1764 stab
= bfd_get_section_by_name (abfd
, ".stab");
1767 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1769 if (stabstr
!= NULL
)
1771 struct bfd_elf_section_data
*secdata
;
1773 secdata
= elf_section_data (stab
);
1774 if (! _bfd_link_section_stabs (abfd
,
1775 &elf_hash_table (info
)->stab_info
,
1777 &secdata
->stab_info
))
1792 if (extversym
!= NULL
)
1797 /* Create some sections which will be filled in with dynamic linking
1798 information. ABFD is an input file which requires dynamic sections
1799 to be created. The dynamic sections take up virtual memory space
1800 when the final executable is run, so we need to create them before
1801 addresses are assigned to the output sections. We work out the
1802 actual contents and size of these sections later. */
1805 elf_link_create_dynamic_sections (abfd
, info
)
1807 struct bfd_link_info
*info
;
1810 register asection
*s
;
1811 struct elf_link_hash_entry
*h
;
1812 struct elf_backend_data
*bed
;
1814 if (elf_hash_table (info
)->dynamic_sections_created
)
1817 /* Make sure that all dynamic sections use the same input BFD. */
1818 if (elf_hash_table (info
)->dynobj
== NULL
)
1819 elf_hash_table (info
)->dynobj
= abfd
;
1821 abfd
= elf_hash_table (info
)->dynobj
;
1823 /* Note that we set the SEC_IN_MEMORY flag for all of these
1825 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1826 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1828 /* A dynamically linked executable has a .interp section, but a
1829 shared library does not. */
1832 s
= bfd_make_section (abfd
, ".interp");
1834 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1838 /* Create sections to hold version informations. These are removed
1839 if they are not needed. */
1840 s
= bfd_make_section (abfd
, ".gnu.version_d");
1842 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1843 || ! bfd_set_section_alignment (abfd
, s
, 2))
1846 s
= bfd_make_section (abfd
, ".gnu.version");
1848 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1849 || ! bfd_set_section_alignment (abfd
, s
, 1))
1852 s
= bfd_make_section (abfd
, ".gnu.version_r");
1854 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1855 || ! bfd_set_section_alignment (abfd
, s
, 2))
1858 s
= bfd_make_section (abfd
, ".dynsym");
1860 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1861 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1864 s
= bfd_make_section (abfd
, ".dynstr");
1866 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1869 /* Create a strtab to hold the dynamic symbol names. */
1870 if (elf_hash_table (info
)->dynstr
== NULL
)
1872 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1873 if (elf_hash_table (info
)->dynstr
== NULL
)
1877 s
= bfd_make_section (abfd
, ".dynamic");
1879 || ! bfd_set_section_flags (abfd
, s
, flags
)
1880 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1883 /* The special symbol _DYNAMIC is always set to the start of the
1884 .dynamic section. This call occurs before we have processed the
1885 symbols for any dynamic object, so we don't have to worry about
1886 overriding a dynamic definition. We could set _DYNAMIC in a
1887 linker script, but we only want to define it if we are, in fact,
1888 creating a .dynamic section. We don't want to define it if there
1889 is no .dynamic section, since on some ELF platforms the start up
1890 code examines it to decide how to initialize the process. */
1892 if (! (_bfd_generic_link_add_one_symbol
1893 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1894 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1895 (struct bfd_link_hash_entry
**) &h
)))
1897 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1898 h
->type
= STT_OBJECT
;
1901 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1904 s
= bfd_make_section (abfd
, ".hash");
1906 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1907 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1910 /* Let the backend create the rest of the sections. This lets the
1911 backend set the right flags. The backend will normally create
1912 the .got and .plt sections. */
1913 bed
= get_elf_backend_data (abfd
);
1914 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1917 elf_hash_table (info
)->dynamic_sections_created
= true;
1922 /* Add an entry to the .dynamic table. */
1925 elf_add_dynamic_entry (info
, tag
, val
)
1926 struct bfd_link_info
*info
;
1930 Elf_Internal_Dyn dyn
;
1934 bfd_byte
*newcontents
;
1936 dynobj
= elf_hash_table (info
)->dynobj
;
1938 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1939 BFD_ASSERT (s
!= NULL
);
1941 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1942 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1943 if (newcontents
== NULL
)
1947 dyn
.d_un
.d_val
= val
;
1948 elf_swap_dyn_out (dynobj
, &dyn
,
1949 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1951 s
->_raw_size
= newsize
;
1952 s
->contents
= newcontents
;
1958 /* Read and swap the relocs for a section. They may have been cached.
1959 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1960 they are used as buffers to read into. They are known to be large
1961 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1962 value is allocated using either malloc or bfd_alloc, according to
1963 the KEEP_MEMORY argument. */
1966 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1970 PTR external_relocs
;
1971 Elf_Internal_Rela
*internal_relocs
;
1972 boolean keep_memory
;
1974 Elf_Internal_Shdr
*rel_hdr
;
1976 Elf_Internal_Rela
*alloc2
= NULL
;
1978 if (elf_section_data (o
)->relocs
!= NULL
)
1979 return elf_section_data (o
)->relocs
;
1981 if (o
->reloc_count
== 0)
1984 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1986 if (internal_relocs
== NULL
)
1990 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1992 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1994 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1995 if (internal_relocs
== NULL
)
1999 if (external_relocs
== NULL
)
2001 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
2004 external_relocs
= alloc1
;
2007 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
2008 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
2009 != rel_hdr
->sh_size
))
2012 /* Swap in the relocs. For convenience, we always produce an
2013 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
2015 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2017 Elf_External_Rel
*erel
;
2018 Elf_External_Rel
*erelend
;
2019 Elf_Internal_Rela
*irela
;
2021 erel
= (Elf_External_Rel
*) external_relocs
;
2022 erelend
= erel
+ o
->reloc_count
;
2023 irela
= internal_relocs
;
2024 for (; erel
< erelend
; erel
++, irela
++)
2026 Elf_Internal_Rel irel
;
2028 elf_swap_reloc_in (abfd
, erel
, &irel
);
2029 irela
->r_offset
= irel
.r_offset
;
2030 irela
->r_info
= irel
.r_info
;
2031 irela
->r_addend
= 0;
2036 Elf_External_Rela
*erela
;
2037 Elf_External_Rela
*erelaend
;
2038 Elf_Internal_Rela
*irela
;
2040 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2042 erela
= (Elf_External_Rela
*) external_relocs
;
2043 erelaend
= erela
+ o
->reloc_count
;
2044 irela
= internal_relocs
;
2045 for (; erela
< erelaend
; erela
++, irela
++)
2046 elf_swap_reloca_in (abfd
, erela
, irela
);
2049 /* Cache the results for next time, if we can. */
2051 elf_section_data (o
)->relocs
= internal_relocs
;
2056 /* Don't free alloc2, since if it was allocated we are passing it
2057 back (under the name of internal_relocs). */
2059 return internal_relocs
;
2070 /* Record an assignment to a symbol made by a linker script. We need
2071 this in case some dynamic object refers to this symbol. */
2075 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2077 struct bfd_link_info
*info
;
2081 struct elf_link_hash_entry
*h
;
2083 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2086 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2090 if (h
->root
.type
== bfd_link_hash_new
)
2091 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2093 /* If this symbol is being provided by the linker script, and it is
2094 currently defined by a dynamic object, but not by a regular
2095 object, then mark it as undefined so that the generic linker will
2096 force the correct value. */
2098 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2099 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2100 h
->root
.type
= bfd_link_hash_undefined
;
2102 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2103 h
->type
= STT_OBJECT
;
2105 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2106 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2108 && h
->dynindx
== -1)
2110 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2113 /* If this is a weak defined symbol, and we know a corresponding
2114 real symbol from the same dynamic object, make sure the real
2115 symbol is also made into a dynamic symbol. */
2116 if (h
->weakdef
!= NULL
2117 && h
->weakdef
->dynindx
== -1)
2119 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2127 /* This structure is used to pass information to
2128 elf_link_assign_sym_version. */
2130 struct elf_assign_sym_version_info
2134 /* General link information. */
2135 struct bfd_link_info
*info
;
2137 struct bfd_elf_version_tree
*verdefs
;
2138 /* Whether we are exporting all dynamic symbols. */
2139 boolean export_dynamic
;
2140 /* Whether we removed any symbols from the dynamic symbol table. */
2141 boolean removed_dynamic
;
2142 /* Whether we had a failure. */
2146 /* This structure is used to pass information to
2147 elf_link_find_version_dependencies. */
2149 struct elf_find_verdep_info
2153 /* General link information. */
2154 struct bfd_link_info
*info
;
2155 /* The number of dependencies. */
2157 /* Whether we had a failure. */
2161 /* Array used to determine the number of hash table buckets to use
2162 based on the number of symbols there are. If there are fewer than
2163 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2164 fewer than 37 we use 17 buckets, and so forth. We never use more
2165 than 32771 buckets. */
2167 static const size_t elf_buckets
[] =
2169 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2173 /* Set up the sizes and contents of the ELF dynamic sections. This is
2174 called by the ELF linker emulation before_allocation routine. We
2175 must set the sizes of the sections before the linker sets the
2176 addresses of the various sections. */
2179 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2180 export_dynamic
, filter_shlib
,
2181 auxiliary_filters
, info
, sinterpptr
,
2186 boolean export_dynamic
;
2187 const char *filter_shlib
;
2188 const char * const *auxiliary_filters
;
2189 struct bfd_link_info
*info
;
2190 asection
**sinterpptr
;
2191 struct bfd_elf_version_tree
*verdefs
;
2193 bfd_size_type soname_indx
;
2195 struct elf_backend_data
*bed
;
2196 bfd_size_type old_dynsymcount
;
2197 struct elf_assign_sym_version_info asvinfo
;
2203 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2206 /* The backend may have to create some sections regardless of whether
2207 we're dynamic or not. */
2208 bed
= get_elf_backend_data (output_bfd
);
2209 if (bed
->elf_backend_always_size_sections
2210 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2213 dynobj
= elf_hash_table (info
)->dynobj
;
2215 /* If there were no dynamic objects in the link, there is nothing to
2220 /* If we are supposed to export all symbols into the dynamic symbol
2221 table (this is not the normal case), then do so. */
2224 struct elf_info_failed eif
;
2228 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2234 if (elf_hash_table (info
)->dynamic_sections_created
)
2236 struct elf_info_failed eif
;
2237 struct elf_link_hash_entry
*h
;
2238 bfd_size_type strsize
;
2240 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2241 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2245 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2246 soname
, true, true);
2247 if (soname_indx
== (bfd_size_type
) -1
2248 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2254 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2262 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2264 if (indx
== (bfd_size_type
) -1
2265 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2269 if (filter_shlib
!= NULL
)
2273 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2274 filter_shlib
, true, true);
2275 if (indx
== (bfd_size_type
) -1
2276 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2280 if (auxiliary_filters
!= NULL
)
2282 const char * const *p
;
2284 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2288 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2290 if (indx
== (bfd_size_type
) -1
2291 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2296 /* Attach all the symbols to their version information. */
2297 asvinfo
.output_bfd
= output_bfd
;
2298 asvinfo
.info
= info
;
2299 asvinfo
.verdefs
= verdefs
;
2300 asvinfo
.export_dynamic
= export_dynamic
;
2301 asvinfo
.removed_dynamic
= false;
2302 asvinfo
.failed
= false;
2304 elf_link_hash_traverse (elf_hash_table (info
),
2305 elf_link_assign_sym_version
,
2310 /* Find all symbols which were defined in a dynamic object and make
2311 the backend pick a reasonable value for them. */
2314 elf_link_hash_traverse (elf_hash_table (info
),
2315 elf_adjust_dynamic_symbol
,
2320 /* Add some entries to the .dynamic section. We fill in some of the
2321 values later, in elf_bfd_final_link, but we must add the entries
2322 now so that we know the final size of the .dynamic section. */
2323 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2326 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2327 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2329 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2332 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2335 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2336 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2338 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2341 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2342 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2343 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2344 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2345 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2346 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2347 sizeof (Elf_External_Sym
)))
2351 /* The backend must work out the sizes of all the other dynamic
2353 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2354 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2357 if (elf_hash_table (info
)->dynamic_sections_created
)
2362 size_t bucketcount
= 0;
2363 Elf_Internal_Sym isym
;
2365 /* Set up the version definition section. */
2366 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2367 BFD_ASSERT (s
!= NULL
);
2369 /* We may have created additional version definitions if we are
2370 just linking a regular application. */
2371 verdefs
= asvinfo
.verdefs
;
2373 if (verdefs
== NULL
)
2377 /* Don't include this section in the output file. */
2378 for (spp
= &output_bfd
->sections
;
2379 *spp
!= s
->output_section
;
2380 spp
= &(*spp
)->next
)
2382 *spp
= s
->output_section
->next
;
2383 --output_bfd
->section_count
;
2389 struct bfd_elf_version_tree
*t
;
2391 Elf_Internal_Verdef def
;
2392 Elf_Internal_Verdaux defaux
;
2394 if (asvinfo
.removed_dynamic
)
2396 /* Some dynamic symbols were changed to be local
2397 symbols. In this case, we renumber all of the
2398 dynamic symbols, so that we don't have a hole. If
2399 the backend changed dynsymcount, then assume that the
2400 new symbols are at the start. This is the case on
2401 the MIPS. FIXME: The names of the removed symbols
2402 will still be in the dynamic string table, wasting
2404 elf_hash_table (info
)->dynsymcount
=
2405 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2406 elf_link_hash_traverse (elf_hash_table (info
),
2407 elf_link_renumber_dynsyms
,
2414 /* Make space for the base version. */
2415 size
+= sizeof (Elf_External_Verdef
);
2416 size
+= sizeof (Elf_External_Verdaux
);
2419 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2421 struct bfd_elf_version_deps
*n
;
2423 size
+= sizeof (Elf_External_Verdef
);
2424 size
+= sizeof (Elf_External_Verdaux
);
2427 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2428 size
+= sizeof (Elf_External_Verdaux
);
2431 s
->_raw_size
= size
;
2432 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2433 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2436 /* Fill in the version definition section. */
2440 def
.vd_version
= VER_DEF_CURRENT
;
2441 def
.vd_flags
= VER_FLG_BASE
;
2444 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2445 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2446 + sizeof (Elf_External_Verdaux
));
2448 if (soname_indx
!= -1)
2450 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2451 defaux
.vda_name
= soname_indx
;
2458 name
= output_bfd
->filename
;
2459 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2460 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2462 if (indx
== (bfd_size_type
) -1)
2464 defaux
.vda_name
= indx
;
2466 defaux
.vda_next
= 0;
2468 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2469 (Elf_External_Verdef
*)p
);
2470 p
+= sizeof (Elf_External_Verdef
);
2471 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2472 (Elf_External_Verdaux
*) p
);
2473 p
+= sizeof (Elf_External_Verdaux
);
2475 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2478 struct bfd_elf_version_deps
*n
;
2479 struct elf_link_hash_entry
*h
;
2482 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2485 /* Add a symbol representing this version. */
2487 if (! (_bfd_generic_link_add_one_symbol
2488 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2489 (bfd_vma
) 0, (const char *) NULL
, false,
2490 get_elf_backend_data (dynobj
)->collect
,
2491 (struct bfd_link_hash_entry
**) &h
)))
2493 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2494 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2495 h
->type
= STT_OBJECT
;
2496 h
->verinfo
.vertree
= t
;
2498 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2501 def
.vd_version
= VER_DEF_CURRENT
;
2503 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2504 def
.vd_flags
|= VER_FLG_WEAK
;
2505 def
.vd_ndx
= t
->vernum
+ 1;
2506 def
.vd_cnt
= cdeps
+ 1;
2507 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2508 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2509 if (t
->next
!= NULL
)
2510 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2511 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2515 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2516 (Elf_External_Verdef
*) p
);
2517 p
+= sizeof (Elf_External_Verdef
);
2519 defaux
.vda_name
= h
->dynstr_index
;
2520 if (t
->deps
== NULL
)
2521 defaux
.vda_next
= 0;
2523 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2524 t
->name_indx
= defaux
.vda_name
;
2526 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2527 (Elf_External_Verdaux
*) p
);
2528 p
+= sizeof (Elf_External_Verdaux
);
2530 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2532 defaux
.vda_name
= n
->version_needed
->name_indx
;
2533 if (n
->next
== NULL
)
2534 defaux
.vda_next
= 0;
2536 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2538 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2539 (Elf_External_Verdaux
*) p
);
2540 p
+= sizeof (Elf_External_Verdaux
);
2544 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2545 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2548 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2551 /* Work out the size of the version reference section. */
2553 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2554 BFD_ASSERT (s
!= NULL
);
2556 struct elf_find_verdep_info sinfo
;
2558 sinfo
.output_bfd
= output_bfd
;
2560 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2561 if (sinfo
.vers
== 0)
2563 sinfo
.failed
= false;
2565 elf_link_hash_traverse (elf_hash_table (info
),
2566 elf_link_find_version_dependencies
,
2569 if (elf_tdata (output_bfd
)->verref
== NULL
)
2573 /* We don't have any version definitions, so we can just
2574 remove the section. */
2576 for (spp
= &output_bfd
->sections
;
2577 *spp
!= s
->output_section
;
2578 spp
= &(*spp
)->next
)
2580 *spp
= s
->output_section
->next
;
2581 --output_bfd
->section_count
;
2585 Elf_Internal_Verneed
*t
;
2590 /* Build the version definition section. */
2593 for (t
= elf_tdata (output_bfd
)->verref
;
2597 Elf_Internal_Vernaux
*a
;
2599 size
+= sizeof (Elf_External_Verneed
);
2601 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2602 size
+= sizeof (Elf_External_Vernaux
);
2605 s
->_raw_size
= size
;
2606 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2607 if (s
->contents
== NULL
)
2611 for (t
= elf_tdata (output_bfd
)->verref
;
2616 Elf_Internal_Vernaux
*a
;
2620 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2623 t
->vn_version
= VER_NEED_CURRENT
;
2625 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2626 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2627 elf_dt_name (t
->vn_bfd
),
2630 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2631 t
->vn_bfd
->filename
, true, false);
2632 if (indx
== (bfd_size_type
) -1)
2635 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2636 if (t
->vn_nextref
== NULL
)
2639 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2640 + caux
* sizeof (Elf_External_Vernaux
));
2642 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2643 (Elf_External_Verneed
*) p
);
2644 p
+= sizeof (Elf_External_Verneed
);
2646 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2648 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2650 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2651 a
->vna_nodename
, true, false);
2652 if (indx
== (bfd_size_type
) -1)
2655 if (a
->vna_nextptr
== NULL
)
2658 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2660 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2661 (Elf_External_Vernaux
*) p
);
2662 p
+= sizeof (Elf_External_Vernaux
);
2666 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2667 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2670 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2674 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2676 /* Work out the size of the symbol version section. */
2677 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2678 BFD_ASSERT (s
!= NULL
);
2679 if (dynsymcount
== 0
2680 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2684 /* We don't need any symbol versions; just discard the
2686 for (spp
= &output_bfd
->sections
;
2687 *spp
!= s
->output_section
;
2688 spp
= &(*spp
)->next
)
2690 *spp
= s
->output_section
->next
;
2691 --output_bfd
->section_count
;
2695 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2696 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2697 if (s
->contents
== NULL
)
2700 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2704 /* Set the size of the .dynsym and .hash sections. We counted
2705 the number of dynamic symbols in elf_link_add_object_symbols.
2706 We will build the contents of .dynsym and .hash when we build
2707 the final symbol table, because until then we do not know the
2708 correct value to give the symbols. We built the .dynstr
2709 section as we went along in elf_link_add_object_symbols. */
2710 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2711 BFD_ASSERT (s
!= NULL
);
2712 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2713 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2714 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2717 /* The first entry in .dynsym is a dummy symbol. */
2724 elf_swap_symbol_out (output_bfd
, &isym
,
2725 (PTR
) (Elf_External_Sym
*) s
->contents
);
2727 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2729 bucketcount
= elf_buckets
[i
];
2730 if (dynsymcount
< elf_buckets
[i
+ 1])
2734 s
= bfd_get_section_by_name (dynobj
, ".hash");
2735 BFD_ASSERT (s
!= NULL
);
2736 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2737 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2738 if (s
->contents
== NULL
)
2740 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2742 put_word (output_bfd
, bucketcount
, s
->contents
);
2743 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2745 elf_hash_table (info
)->bucketcount
= bucketcount
;
2747 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2748 BFD_ASSERT (s
!= NULL
);
2749 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2751 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2758 /* Fix up the flags for a symbol. This handles various cases which
2759 can only be fixed after all the input files are seen. This is
2760 currently called by both adjust_dynamic_symbol and
2761 assign_sym_version, which is unnecessary but perhaps more robust in
2762 the face of future changes. */
2765 elf_fix_symbol_flags (h
, eif
)
2766 struct elf_link_hash_entry
*h
;
2767 struct elf_info_failed
*eif
;
2769 /* If this symbol was mentioned in a non-ELF file, try to set
2770 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2771 permit a non-ELF file to correctly refer to a symbol defined in
2772 an ELF dynamic object. */
2773 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2775 if (h
->root
.type
!= bfd_link_hash_defined
2776 && h
->root
.type
!= bfd_link_hash_defweak
)
2777 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2780 if (h
->root
.u
.def
.section
->owner
!= NULL
2781 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2782 == bfd_target_elf_flavour
))
2783 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2785 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2788 if (h
->dynindx
== -1
2789 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2790 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2792 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2800 /* If this is a final link, and the symbol was defined as a common
2801 symbol in a regular object file, and there was no definition in
2802 any dynamic object, then the linker will have allocated space for
2803 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2804 flag will not have been set. */
2805 if (h
->root
.type
== bfd_link_hash_defined
2806 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2807 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2808 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2809 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2810 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2812 /* If -Bsymbolic was used (which means to bind references to global
2813 symbols to the definition within the shared object), and this
2814 symbol was defined in a regular object, then it actually doesn't
2815 need a PLT entry. */
2816 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2817 && eif
->info
->shared
2818 && eif
->info
->symbolic
2819 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2820 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2825 /* Make the backend pick a good value for a dynamic symbol. This is
2826 called via elf_link_hash_traverse, and also calls itself
2830 elf_adjust_dynamic_symbol (h
, data
)
2831 struct elf_link_hash_entry
*h
;
2834 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2836 struct elf_backend_data
*bed
;
2838 /* Ignore indirect symbols. These are added by the versioning code. */
2839 if (h
->root
.type
== bfd_link_hash_indirect
)
2842 /* Fix the symbol flags. */
2843 if (! elf_fix_symbol_flags (h
, eif
))
2846 /* If this symbol does not require a PLT entry, and it is not
2847 defined by a dynamic object, or is not referenced by a regular
2848 object, ignore it. We do have to handle a weak defined symbol,
2849 even if no regular object refers to it, if we decided to add it
2850 to the dynamic symbol table. FIXME: Do we normally need to worry
2851 about symbols which are defined by one dynamic object and
2852 referenced by another one? */
2853 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2854 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2855 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2856 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2857 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2860 /* If we've already adjusted this symbol, don't do it again. This
2861 can happen via a recursive call. */
2862 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2865 /* Don't look at this symbol again. Note that we must set this
2866 after checking the above conditions, because we may look at a
2867 symbol once, decide not to do anything, and then get called
2868 recursively later after REF_REGULAR is set below. */
2869 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2871 /* If this is a weak definition, and we know a real definition, and
2872 the real symbol is not itself defined by a regular object file,
2873 then get a good value for the real definition. We handle the
2874 real symbol first, for the convenience of the backend routine.
2876 Note that there is a confusing case here. If the real definition
2877 is defined by a regular object file, we don't get the real symbol
2878 from the dynamic object, but we do get the weak symbol. If the
2879 processor backend uses a COPY reloc, then if some routine in the
2880 dynamic object changes the real symbol, we will not see that
2881 change in the corresponding weak symbol. This is the way other
2882 ELF linkers work as well, and seems to be a result of the shared
2885 I will clarify this issue. Most SVR4 shared libraries define the
2886 variable _timezone and define timezone as a weak synonym. The
2887 tzset call changes _timezone. If you write
2888 extern int timezone;
2890 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2891 you might expect that, since timezone is a synonym for _timezone,
2892 the same number will print both times. However, if the processor
2893 backend uses a COPY reloc, then actually timezone will be copied
2894 into your process image, and, since you define _timezone
2895 yourself, _timezone will not. Thus timezone and _timezone will
2896 wind up at different memory locations. The tzset call will set
2897 _timezone, leaving timezone unchanged. */
2899 if (h
->weakdef
!= NULL
)
2901 struct elf_link_hash_entry
*weakdef
;
2903 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2904 || h
->root
.type
== bfd_link_hash_defweak
);
2905 weakdef
= h
->weakdef
;
2906 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2907 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2908 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2909 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2911 /* This symbol is defined by a regular object file, so we
2912 will not do anything special. Clear weakdef for the
2913 convenience of the processor backend. */
2918 /* There is an implicit reference by a regular object file
2919 via the weak symbol. */
2920 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2921 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2926 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2927 bed
= get_elf_backend_data (dynobj
);
2928 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2937 /* This routine is used to export all defined symbols into the dynamic
2938 symbol table. It is called via elf_link_hash_traverse. */
2941 elf_export_symbol (h
, data
)
2942 struct elf_link_hash_entry
*h
;
2945 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2947 /* Ignore indirect symbols. These are added by the versioning code. */
2948 if (h
->root
.type
== bfd_link_hash_indirect
)
2951 if (h
->dynindx
== -1
2952 && (h
->elf_link_hash_flags
2953 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2955 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2965 /* Look through the symbols which are defined in other shared
2966 libraries and referenced here. Update the list of version
2967 dependencies. This will be put into the .gnu.version_r section.
2968 This function is called via elf_link_hash_traverse. */
2971 elf_link_find_version_dependencies (h
, data
)
2972 struct elf_link_hash_entry
*h
;
2975 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2976 Elf_Internal_Verneed
*t
;
2977 Elf_Internal_Vernaux
*a
;
2979 /* We only care about symbols defined in shared objects with version
2981 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2982 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2984 || h
->verinfo
.verdef
== NULL
)
2987 /* See if we already know about this version. */
2988 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
2990 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2993 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2994 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3000 /* This is a new version. Add it to tree we are building. */
3004 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3007 rinfo
->failed
= true;
3011 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3012 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3013 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3016 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3018 /* Note that we are copying a string pointer here, and testing it
3019 above. If bfd_elf_string_from_elf_section is ever changed to
3020 discard the string data when low in memory, this will have to be
3022 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3024 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3025 a
->vna_nextptr
= t
->vn_auxptr
;
3027 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3030 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3037 /* Figure out appropriate versions for all the symbols. We may not
3038 have the version number script until we have read all of the input
3039 files, so until that point we don't know which symbols should be
3040 local. This function is called via elf_link_hash_traverse. */
3043 elf_link_assign_sym_version (h
, data
)
3044 struct elf_link_hash_entry
*h
;
3047 struct elf_assign_sym_version_info
*sinfo
=
3048 (struct elf_assign_sym_version_info
*) data
;
3049 struct bfd_link_info
*info
= sinfo
->info
;
3050 struct elf_info_failed eif
;
3053 /* Fix the symbol flags. */
3056 if (! elf_fix_symbol_flags (h
, &eif
))
3059 sinfo
->failed
= true;
3063 /* We only need version numbers for symbols defined in regular
3065 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3068 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3069 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3071 struct bfd_elf_version_tree
*t
;
3076 /* There are two consecutive ELF_VER_CHR characters if this is
3077 not a hidden symbol. */
3079 if (*p
== ELF_VER_CHR
)
3085 /* If there is no version string, we can just return out. */
3089 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3093 /* Look for the version. If we find it, it is no longer weak. */
3094 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3096 if (strcmp (t
->name
, p
) == 0)
3098 h
->verinfo
.vertree
= t
;
3101 /* See if there is anything to force this symbol to
3103 if (t
->locals
!= NULL
)
3107 struct bfd_elf_version_expr
*d
;
3109 len
= p
- h
->root
.root
.string
;
3110 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3113 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3114 alc
[len
- 1] = '\0';
3115 if (alc
[len
- 2] == ELF_VER_CHR
)
3116 alc
[len
- 2] = '\0';
3118 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3120 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3121 || fnmatch (d
->match
, alc
, 0) == 0)
3123 if (h
->dynindx
!= -1
3125 && ! sinfo
->export_dynamic
)
3127 sinfo
->removed_dynamic
= true;
3128 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3129 h
->elf_link_hash_flags
&=~
3130 ELF_LINK_HASH_NEEDS_PLT
;
3132 /* FIXME: The name of the symbol has
3133 already been recorded in the dynamic
3134 string table section. */
3141 bfd_release (sinfo
->output_bfd
, alc
);
3148 /* If we are building an application, we need to create a
3149 version node for this version. */
3150 if (t
== NULL
&& ! info
->shared
)
3152 struct bfd_elf_version_tree
**pp
;
3155 /* If we aren't going to export this symbol, we don't need
3156 to worry about it. */
3157 if (h
->dynindx
== -1)
3160 t
= ((struct bfd_elf_version_tree
*)
3161 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3164 sinfo
->failed
= true;
3173 t
->name_indx
= (unsigned int) -1;
3177 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3179 t
->vernum
= version_index
;
3183 h
->verinfo
.vertree
= t
;
3187 /* We could not find the version for a symbol when
3188 generating a shared archive. Return an error. */
3189 (*_bfd_error_handler
)
3190 ("%s: undefined version name %s",
3191 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3192 bfd_set_error (bfd_error_bad_value
);
3193 sinfo
->failed
= true;
3198 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3201 /* If we don't have a version for this symbol, see if we can find
3203 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3205 struct bfd_elf_version_tree
*t
;
3206 struct bfd_elf_version_tree
*deflt
;
3207 struct bfd_elf_version_expr
*d
;
3209 /* See if can find what version this symbol is in. If the
3210 symbol is supposed to be local, then don't actually register
3213 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3215 if (t
->globals
!= NULL
)
3217 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3219 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3221 h
->verinfo
.vertree
= t
;
3230 if (t
->locals
!= NULL
)
3232 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3234 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
3236 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3238 h
->verinfo
.vertree
= t
;
3239 if (h
->dynindx
!= -1
3241 && ! sinfo
->export_dynamic
)
3243 sinfo
->removed_dynamic
= true;
3244 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3245 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3247 /* FIXME: The name of the symbol has already
3248 been recorded in the dynamic string table
3260 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3262 h
->verinfo
.vertree
= deflt
;
3263 if (h
->dynindx
!= -1
3265 && ! sinfo
->export_dynamic
)
3267 sinfo
->removed_dynamic
= true;
3268 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3269 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3271 /* FIXME: The name of the symbol has already been
3272 recorded in the dynamic string table section. */
3280 /* This function is used to renumber the dynamic symbols, if some of
3281 them are removed because they are marked as local. This is called
3282 via elf_link_hash_traverse. */
3285 elf_link_renumber_dynsyms (h
, data
)
3286 struct elf_link_hash_entry
*h
;
3289 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3291 if (h
->dynindx
!= -1)
3293 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3294 ++elf_hash_table (info
)->dynsymcount
;
3300 /* Final phase of ELF linker. */
3302 /* A structure we use to avoid passing large numbers of arguments. */
3304 struct elf_final_link_info
3306 /* General link information. */
3307 struct bfd_link_info
*info
;
3310 /* Symbol string table. */
3311 struct bfd_strtab_hash
*symstrtab
;
3312 /* .dynsym section. */
3313 asection
*dynsym_sec
;
3314 /* .hash section. */
3316 /* symbol version section (.gnu.version). */
3317 asection
*symver_sec
;
3318 /* Buffer large enough to hold contents of any section. */
3320 /* Buffer large enough to hold external relocs of any section. */
3321 PTR external_relocs
;
3322 /* Buffer large enough to hold internal relocs of any section. */
3323 Elf_Internal_Rela
*internal_relocs
;
3324 /* Buffer large enough to hold external local symbols of any input
3326 Elf_External_Sym
*external_syms
;
3327 /* Buffer large enough to hold internal local symbols of any input
3329 Elf_Internal_Sym
*internal_syms
;
3330 /* Array large enough to hold a symbol index for each local symbol
3331 of any input BFD. */
3333 /* Array large enough to hold a section pointer for each local
3334 symbol of any input BFD. */
3335 asection
**sections
;
3336 /* Buffer to hold swapped out symbols. */
3337 Elf_External_Sym
*symbuf
;
3338 /* Number of swapped out symbols in buffer. */
3339 size_t symbuf_count
;
3340 /* Number of symbols which fit in symbuf. */
3344 static boolean elf_link_output_sym
3345 PARAMS ((struct elf_final_link_info
*, const char *,
3346 Elf_Internal_Sym
*, asection
*));
3347 static boolean elf_link_flush_output_syms
3348 PARAMS ((struct elf_final_link_info
*));
3349 static boolean elf_link_output_extsym
3350 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3351 static boolean elf_link_input_bfd
3352 PARAMS ((struct elf_final_link_info
*, bfd
*));
3353 static boolean elf_reloc_link_order
3354 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3355 struct bfd_link_order
*));
3357 /* This struct is used to pass information to elf_link_output_extsym. */
3359 struct elf_outext_info
3363 struct elf_final_link_info
*finfo
;
3366 /* Do the final step of an ELF link. */
3369 elf_bfd_final_link (abfd
, info
)
3371 struct bfd_link_info
*info
;
3375 struct elf_final_link_info finfo
;
3376 register asection
*o
;
3377 register struct bfd_link_order
*p
;
3379 size_t max_contents_size
;
3380 size_t max_external_reloc_size
;
3381 size_t max_internal_reloc_count
;
3382 size_t max_sym_count
;
3384 Elf_Internal_Sym elfsym
;
3386 Elf_Internal_Shdr
*symtab_hdr
;
3387 Elf_Internal_Shdr
*symstrtab_hdr
;
3388 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3389 struct elf_outext_info eoinfo
;
3392 abfd
->flags
|= DYNAMIC
;
3394 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3395 dynobj
= elf_hash_table (info
)->dynobj
;
3398 finfo
.output_bfd
= abfd
;
3399 finfo
.symstrtab
= elf_stringtab_init ();
3400 if (finfo
.symstrtab
== NULL
)
3405 finfo
.dynsym_sec
= NULL
;
3406 finfo
.hash_sec
= NULL
;
3407 finfo
.symver_sec
= NULL
;
3411 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3412 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3413 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3414 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3415 /* Note that it is OK if symver_sec is NULL. */
3418 finfo
.contents
= NULL
;
3419 finfo
.external_relocs
= NULL
;
3420 finfo
.internal_relocs
= NULL
;
3421 finfo
.external_syms
= NULL
;
3422 finfo
.internal_syms
= NULL
;
3423 finfo
.indices
= NULL
;
3424 finfo
.sections
= NULL
;
3425 finfo
.symbuf
= NULL
;
3426 finfo
.symbuf_count
= 0;
3428 /* Count up the number of relocations we will output for each output
3429 section, so that we know the sizes of the reloc sections. We
3430 also figure out some maximum sizes. */
3431 max_contents_size
= 0;
3432 max_external_reloc_size
= 0;
3433 max_internal_reloc_count
= 0;
3435 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3439 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3441 if (p
->type
== bfd_section_reloc_link_order
3442 || p
->type
== bfd_symbol_reloc_link_order
)
3444 else if (p
->type
== bfd_indirect_link_order
)
3448 sec
= p
->u
.indirect
.section
;
3450 /* Mark all sections which are to be included in the
3451 link. This will normally be every section. We need
3452 to do this so that we can identify any sections which
3453 the linker has decided to not include. */
3454 sec
->linker_mark
= true;
3456 if (info
->relocateable
)
3457 o
->reloc_count
+= sec
->reloc_count
;
3459 if (sec
->_raw_size
> max_contents_size
)
3460 max_contents_size
= sec
->_raw_size
;
3461 if (sec
->_cooked_size
> max_contents_size
)
3462 max_contents_size
= sec
->_cooked_size
;
3464 /* We are interested in just local symbols, not all
3466 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3467 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3471 if (elf_bad_symtab (sec
->owner
))
3472 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3473 / sizeof (Elf_External_Sym
));
3475 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3477 if (sym_count
> max_sym_count
)
3478 max_sym_count
= sym_count
;
3480 if ((sec
->flags
& SEC_RELOC
) != 0)
3484 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3485 if (ext_size
> max_external_reloc_size
)
3486 max_external_reloc_size
= ext_size
;
3487 if (sec
->reloc_count
> max_internal_reloc_count
)
3488 max_internal_reloc_count
= sec
->reloc_count
;
3494 if (o
->reloc_count
> 0)
3495 o
->flags
|= SEC_RELOC
;
3498 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3499 set it (this is probably a bug) and if it is set
3500 assign_section_numbers will create a reloc section. */
3501 o
->flags
&=~ SEC_RELOC
;
3504 /* If the SEC_ALLOC flag is not set, force the section VMA to
3505 zero. This is done in elf_fake_sections as well, but forcing
3506 the VMA to 0 here will ensure that relocs against these
3507 sections are handled correctly. */
3508 if ((o
->flags
& SEC_ALLOC
) == 0
3509 && ! o
->user_set_vma
)
3513 /* Figure out the file positions for everything but the symbol table
3514 and the relocs. We set symcount to force assign_section_numbers
3515 to create a symbol table. */
3516 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3517 BFD_ASSERT (! abfd
->output_has_begun
);
3518 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3521 /* That created the reloc sections. Set their sizes, and assign
3522 them file positions, and allocate some buffers. */
3523 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3525 if ((o
->flags
& SEC_RELOC
) != 0)
3527 Elf_Internal_Shdr
*rel_hdr
;
3528 register struct elf_link_hash_entry
**p
, **pend
;
3530 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3532 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3534 /* The contents field must last into write_object_contents,
3535 so we allocate it with bfd_alloc rather than malloc. */
3536 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3537 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3540 p
= ((struct elf_link_hash_entry
**)
3541 bfd_malloc (o
->reloc_count
3542 * sizeof (struct elf_link_hash_entry
*)));
3543 if (p
== NULL
&& o
->reloc_count
!= 0)
3545 elf_section_data (o
)->rel_hashes
= p
;
3546 pend
= p
+ o
->reloc_count
;
3547 for (; p
< pend
; p
++)
3550 /* Use the reloc_count field as an index when outputting the
3556 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3558 /* We have now assigned file positions for all the sections except
3559 .symtab and .strtab. We start the .symtab section at the current
3560 file position, and write directly to it. We build the .strtab
3561 section in memory. */
3563 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3564 /* sh_name is set in prep_headers. */
3565 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3566 symtab_hdr
->sh_flags
= 0;
3567 symtab_hdr
->sh_addr
= 0;
3568 symtab_hdr
->sh_size
= 0;
3569 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3570 /* sh_link is set in assign_section_numbers. */
3571 /* sh_info is set below. */
3572 /* sh_offset is set just below. */
3573 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3575 off
= elf_tdata (abfd
)->next_file_pos
;
3576 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3578 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3579 incorrect. We do not yet know the size of the .symtab section.
3580 We correct next_file_pos below, after we do know the size. */
3582 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3583 continuously seeking to the right position in the file. */
3584 if (! info
->keep_memory
|| max_sym_count
< 20)
3585 finfo
.symbuf_size
= 20;
3587 finfo
.symbuf_size
= max_sym_count
;
3588 finfo
.symbuf
= ((Elf_External_Sym
*)
3589 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3590 if (finfo
.symbuf
== NULL
)
3593 /* Start writing out the symbol table. The first symbol is always a
3595 if (info
->strip
!= strip_all
|| info
->relocateable
)
3597 elfsym
.st_value
= 0;
3600 elfsym
.st_other
= 0;
3601 elfsym
.st_shndx
= SHN_UNDEF
;
3602 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3603 &elfsym
, bfd_und_section_ptr
))
3608 /* Some standard ELF linkers do this, but we don't because it causes
3609 bootstrap comparison failures. */
3610 /* Output a file symbol for the output file as the second symbol.
3611 We output this even if we are discarding local symbols, although
3612 I'm not sure if this is correct. */
3613 elfsym
.st_value
= 0;
3615 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3616 elfsym
.st_other
= 0;
3617 elfsym
.st_shndx
= SHN_ABS
;
3618 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3619 &elfsym
, bfd_abs_section_ptr
))
3623 /* Output a symbol for each section. We output these even if we are
3624 discarding local symbols, since they are used for relocs. These
3625 symbols have no names. We store the index of each one in the
3626 index field of the section, so that we can find it again when
3627 outputting relocs. */
3628 if (info
->strip
!= strip_all
|| info
->relocateable
)
3631 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3632 elfsym
.st_other
= 0;
3633 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3635 o
= section_from_elf_index (abfd
, i
);
3637 o
->target_index
= abfd
->symcount
;
3638 elfsym
.st_shndx
= i
;
3639 if (info
->relocateable
|| o
== NULL
)
3640 elfsym
.st_value
= 0;
3642 elfsym
.st_value
= o
->vma
;
3643 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3649 /* Allocate some memory to hold information read in from the input
3651 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3652 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3653 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3654 bfd_malloc (max_internal_reloc_count
3655 * sizeof (Elf_Internal_Rela
)));
3656 finfo
.external_syms
= ((Elf_External_Sym
*)
3657 bfd_malloc (max_sym_count
3658 * sizeof (Elf_External_Sym
)));
3659 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3660 bfd_malloc (max_sym_count
3661 * sizeof (Elf_Internal_Sym
)));
3662 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3663 finfo
.sections
= ((asection
**)
3664 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3665 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3666 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3667 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3668 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3669 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3670 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3671 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3674 /* Since ELF permits relocations to be against local symbols, we
3675 must have the local symbols available when we do the relocations.
3676 Since we would rather only read the local symbols once, and we
3677 would rather not keep them in memory, we handle all the
3678 relocations for a single input file at the same time.
3680 Unfortunately, there is no way to know the total number of local
3681 symbols until we have seen all of them, and the local symbol
3682 indices precede the global symbol indices. This means that when
3683 we are generating relocateable output, and we see a reloc against
3684 a global symbol, we can not know the symbol index until we have
3685 finished examining all the local symbols to see which ones we are
3686 going to output. To deal with this, we keep the relocations in
3687 memory, and don't output them until the end of the link. This is
3688 an unfortunate waste of memory, but I don't see a good way around
3689 it. Fortunately, it only happens when performing a relocateable
3690 link, which is not the common case. FIXME: If keep_memory is set
3691 we could write the relocs out and then read them again; I don't
3692 know how bad the memory loss will be. */
3694 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
3695 sub
->output_has_begun
= false;
3696 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3698 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3700 if (p
->type
== bfd_indirect_link_order
3701 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3702 == bfd_target_elf_flavour
))
3704 sub
= p
->u
.indirect
.section
->owner
;
3705 if (! sub
->output_has_begun
)
3707 if (! elf_link_input_bfd (&finfo
, sub
))
3709 sub
->output_has_begun
= true;
3712 else if (p
->type
== bfd_section_reloc_link_order
3713 || p
->type
== bfd_symbol_reloc_link_order
)
3715 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3720 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3726 /* That wrote out all the local symbols. Finish up the symbol table
3727 with the global symbols. */
3729 if (info
->strip
!= strip_all
&& info
->shared
)
3731 /* Output any global symbols that got converted to local in a
3732 version script. We do this in a separate step since ELF
3733 requires all local symbols to appear prior to any global
3734 symbols. FIXME: We should only do this if some global
3735 symbols were, in fact, converted to become local. FIXME:
3736 Will this work correctly with the Irix 5 linker? */
3737 eoinfo
.failed
= false;
3738 eoinfo
.finfo
= &finfo
;
3739 eoinfo
.localsyms
= true;
3740 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3746 /* The sh_info field records the index of the first non local
3748 symtab_hdr
->sh_info
= abfd
->symcount
;
3750 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3752 /* We get the global symbols from the hash table. */
3753 eoinfo
.failed
= false;
3754 eoinfo
.localsyms
= false;
3755 eoinfo
.finfo
= &finfo
;
3756 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3761 /* Flush all symbols to the file. */
3762 if (! elf_link_flush_output_syms (&finfo
))
3765 /* Now we know the size of the symtab section. */
3766 off
+= symtab_hdr
->sh_size
;
3768 /* Finish up and write out the symbol string table (.strtab)
3770 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3771 /* sh_name was set in prep_headers. */
3772 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3773 symstrtab_hdr
->sh_flags
= 0;
3774 symstrtab_hdr
->sh_addr
= 0;
3775 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3776 symstrtab_hdr
->sh_entsize
= 0;
3777 symstrtab_hdr
->sh_link
= 0;
3778 symstrtab_hdr
->sh_info
= 0;
3779 /* sh_offset is set just below. */
3780 symstrtab_hdr
->sh_addralign
= 1;
3782 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3783 elf_tdata (abfd
)->next_file_pos
= off
;
3785 if (abfd
->symcount
> 0)
3787 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3788 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3792 /* Adjust the relocs to have the correct symbol indices. */
3793 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3795 struct elf_link_hash_entry
**rel_hash
;
3796 Elf_Internal_Shdr
*rel_hdr
;
3798 if ((o
->flags
& SEC_RELOC
) == 0)
3801 rel_hash
= elf_section_data (o
)->rel_hashes
;
3802 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3803 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3805 if (*rel_hash
== NULL
)
3808 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3810 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3812 Elf_External_Rel
*erel
;
3813 Elf_Internal_Rel irel
;
3815 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3816 elf_swap_reloc_in (abfd
, erel
, &irel
);
3817 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3818 ELF_R_TYPE (irel
.r_info
));
3819 elf_swap_reloc_out (abfd
, &irel
, erel
);
3823 Elf_External_Rela
*erela
;
3824 Elf_Internal_Rela irela
;
3826 BFD_ASSERT (rel_hdr
->sh_entsize
3827 == sizeof (Elf_External_Rela
));
3829 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3830 elf_swap_reloca_in (abfd
, erela
, &irela
);
3831 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3832 ELF_R_TYPE (irela
.r_info
));
3833 elf_swap_reloca_out (abfd
, &irela
, erela
);
3837 /* Set the reloc_count field to 0 to prevent write_relocs from
3838 trying to swap the relocs out itself. */
3842 /* If we are linking against a dynamic object, or generating a
3843 shared library, finish up the dynamic linking information. */
3846 Elf_External_Dyn
*dyncon
, *dynconend
;
3848 /* Fix up .dynamic entries. */
3849 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3850 BFD_ASSERT (o
!= NULL
);
3852 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3853 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3854 for (; dyncon
< dynconend
; dyncon
++)
3856 Elf_Internal_Dyn dyn
;
3860 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3867 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3868 magic _init and _fini symbols. This is pretty ugly,
3869 but we are compatible. */
3877 struct elf_link_hash_entry
*h
;
3879 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3880 false, false, true);
3882 && (h
->root
.type
== bfd_link_hash_defined
3883 || h
->root
.type
== bfd_link_hash_defweak
))
3885 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3886 o
= h
->root
.u
.def
.section
;
3887 if (o
->output_section
!= NULL
)
3888 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3889 + o
->output_offset
);
3892 /* The symbol is imported from another shared
3893 library and does not apply to this one. */
3897 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3912 name
= ".gnu.version_d";
3915 name
= ".gnu.version_r";
3918 name
= ".gnu.version";
3920 o
= bfd_get_section_by_name (abfd
, name
);
3921 BFD_ASSERT (o
!= NULL
);
3922 dyn
.d_un
.d_ptr
= o
->vma
;
3923 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3930 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3935 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3937 Elf_Internal_Shdr
*hdr
;
3939 hdr
= elf_elfsections (abfd
)[i
];
3940 if (hdr
->sh_type
== type
3941 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3943 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3944 dyn
.d_un
.d_val
+= hdr
->sh_size
;
3947 if (dyn
.d_un
.d_val
== 0
3948 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
3949 dyn
.d_un
.d_val
= hdr
->sh_addr
;
3953 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3959 /* If we have created any dynamic sections, then output them. */
3962 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
3965 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
3967 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
3968 || o
->_raw_size
== 0)
3970 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
3972 /* At this point, we are only interested in sections
3973 created by elf_link_create_dynamic_sections. */
3976 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
3978 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
3980 if (! bfd_set_section_contents (abfd
, o
->output_section
,
3981 o
->contents
, o
->output_offset
,
3989 /* The contents of the .dynstr section are actually in a
3991 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
3992 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
3993 || ! _bfd_stringtab_emit (abfd
,
3994 elf_hash_table (info
)->dynstr
))
4000 /* If we have optimized stabs strings, output them. */
4001 if (elf_hash_table (info
)->stab_info
!= NULL
)
4003 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4007 if (finfo
.symstrtab
!= NULL
)
4008 _bfd_stringtab_free (finfo
.symstrtab
);
4009 if (finfo
.contents
!= NULL
)
4010 free (finfo
.contents
);
4011 if (finfo
.external_relocs
!= NULL
)
4012 free (finfo
.external_relocs
);
4013 if (finfo
.internal_relocs
!= NULL
)
4014 free (finfo
.internal_relocs
);
4015 if (finfo
.external_syms
!= NULL
)
4016 free (finfo
.external_syms
);
4017 if (finfo
.internal_syms
!= NULL
)
4018 free (finfo
.internal_syms
);
4019 if (finfo
.indices
!= NULL
)
4020 free (finfo
.indices
);
4021 if (finfo
.sections
!= NULL
)
4022 free (finfo
.sections
);
4023 if (finfo
.symbuf
!= NULL
)
4024 free (finfo
.symbuf
);
4025 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4027 if ((o
->flags
& SEC_RELOC
) != 0
4028 && elf_section_data (o
)->rel_hashes
!= NULL
)
4029 free (elf_section_data (o
)->rel_hashes
);
4032 elf_tdata (abfd
)->linker
= true;
4037 if (finfo
.symstrtab
!= NULL
)
4038 _bfd_stringtab_free (finfo
.symstrtab
);
4039 if (finfo
.contents
!= NULL
)
4040 free (finfo
.contents
);
4041 if (finfo
.external_relocs
!= NULL
)
4042 free (finfo
.external_relocs
);
4043 if (finfo
.internal_relocs
!= NULL
)
4044 free (finfo
.internal_relocs
);
4045 if (finfo
.external_syms
!= NULL
)
4046 free (finfo
.external_syms
);
4047 if (finfo
.internal_syms
!= NULL
)
4048 free (finfo
.internal_syms
);
4049 if (finfo
.indices
!= NULL
)
4050 free (finfo
.indices
);
4051 if (finfo
.sections
!= NULL
)
4052 free (finfo
.sections
);
4053 if (finfo
.symbuf
!= NULL
)
4054 free (finfo
.symbuf
);
4055 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4057 if ((o
->flags
& SEC_RELOC
) != 0
4058 && elf_section_data (o
)->rel_hashes
!= NULL
)
4059 free (elf_section_data (o
)->rel_hashes
);
4065 /* Add a symbol to the output symbol table. */
4068 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4069 struct elf_final_link_info
*finfo
;
4071 Elf_Internal_Sym
*elfsym
;
4072 asection
*input_sec
;
4074 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4075 struct bfd_link_info
*info
,
4080 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4081 elf_backend_link_output_symbol_hook
;
4082 if (output_symbol_hook
!= NULL
)
4084 if (! ((*output_symbol_hook
)
4085 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4089 if (name
== (const char *) NULL
|| *name
== '\0')
4090 elfsym
->st_name
= 0;
4093 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4096 if (elfsym
->st_name
== (unsigned long) -1)
4100 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4102 if (! elf_link_flush_output_syms (finfo
))
4106 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4107 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4108 ++finfo
->symbuf_count
;
4110 ++finfo
->output_bfd
->symcount
;
4115 /* Flush the output symbols to the file. */
4118 elf_link_flush_output_syms (finfo
)
4119 struct elf_final_link_info
*finfo
;
4121 if (finfo
->symbuf_count
> 0)
4123 Elf_Internal_Shdr
*symtab
;
4125 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4127 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4129 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4130 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4131 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4134 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4136 finfo
->symbuf_count
= 0;
4142 /* Add an external symbol to the symbol table. This is called from
4143 the hash table traversal routine. When generating a shared object,
4144 we go through the symbol table twice. The first time we output
4145 anything that might have been forced to local scope in a version
4146 script. The second time we output the symbols that are still
4150 elf_link_output_extsym (h
, data
)
4151 struct elf_link_hash_entry
*h
;
4154 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4155 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4157 Elf_Internal_Sym sym
;
4158 asection
*input_sec
;
4160 /* Decide whether to output this symbol in this pass. */
4161 if (eoinfo
->localsyms
)
4163 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4168 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4172 /* If we are not creating a shared library, and this symbol is
4173 referenced by a shared library but is not defined anywhere, then
4174 warn that it is undefined. If we do not do this, the runtime
4175 linker will complain that the symbol is undefined when the
4176 program is run. We don't have to worry about symbols that are
4177 referenced by regular files, because we will already have issued
4178 warnings for them. */
4179 if (! finfo
->info
->relocateable
4180 && ! finfo
->info
->shared
4181 && h
->root
.type
== bfd_link_hash_undefined
4182 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4183 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4185 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4186 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4187 (asection
*) NULL
, 0)))
4189 eoinfo
->failed
= true;
4194 /* We don't want to output symbols that have never been mentioned by
4195 a regular file, or that we have been told to strip. However, if
4196 h->indx is set to -2, the symbol is used by a reloc and we must
4200 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4201 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4202 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4203 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4205 else if (finfo
->info
->strip
== strip_all
4206 || (finfo
->info
->strip
== strip_some
4207 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4208 h
->root
.root
.string
,
4209 false, false) == NULL
))
4214 /* If we're stripping it, and it's not a dynamic symbol, there's
4215 nothing else to do. */
4216 if (strip
&& h
->dynindx
== -1)
4220 sym
.st_size
= h
->size
;
4221 sym
.st_other
= h
->other
;
4222 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4223 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4224 else if (h
->root
.type
== bfd_link_hash_undefweak
4225 || h
->root
.type
== bfd_link_hash_defweak
)
4226 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4228 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4230 switch (h
->root
.type
)
4233 case bfd_link_hash_new
:
4237 case bfd_link_hash_undefined
:
4238 input_sec
= bfd_und_section_ptr
;
4239 sym
.st_shndx
= SHN_UNDEF
;
4242 case bfd_link_hash_undefweak
:
4243 input_sec
= bfd_und_section_ptr
;
4244 sym
.st_shndx
= SHN_UNDEF
;
4247 case bfd_link_hash_defined
:
4248 case bfd_link_hash_defweak
:
4250 input_sec
= h
->root
.u
.def
.section
;
4251 if (input_sec
->output_section
!= NULL
)
4254 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4255 input_sec
->output_section
);
4256 if (sym
.st_shndx
== (unsigned short) -1)
4258 eoinfo
->failed
= true;
4262 /* ELF symbols in relocateable files are section relative,
4263 but in nonrelocateable files they are virtual
4265 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4266 if (! finfo
->info
->relocateable
)
4267 sym
.st_value
+= input_sec
->output_section
->vma
;
4271 BFD_ASSERT (input_sec
->owner
== NULL
4272 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4273 sym
.st_shndx
= SHN_UNDEF
;
4274 input_sec
= bfd_und_section_ptr
;
4279 case bfd_link_hash_common
:
4280 input_sec
= bfd_com_section_ptr
;
4281 sym
.st_shndx
= SHN_COMMON
;
4282 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4285 case bfd_link_hash_indirect
:
4286 /* These symbols are created by symbol versioning. They point
4287 to the decorated version of the name. For example, if the
4288 symbol foo@@GNU_1.2 is the default, which should be used when
4289 foo is used with no version, then we add an indirect symbol
4290 foo which points to foo@@GNU_1.2. We ignore these symbols,
4291 since the indirected symbol is already in the hash table. If
4292 the indirect symbol is non-ELF, fall through and output it. */
4293 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4297 case bfd_link_hash_warning
:
4298 /* We can't represent these symbols in ELF, although a warning
4299 symbol may have come from a .gnu.warning.SYMBOL section. We
4300 just put the target symbol in the hash table. If the target
4301 symbol does not really exist, don't do anything. */
4302 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4304 return (elf_link_output_extsym
4305 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4308 /* Give the processor backend a chance to tweak the symbol value,
4309 and also to finish up anything that needs to be done for this
4311 if ((h
->dynindx
!= -1
4312 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4313 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4315 struct elf_backend_data
*bed
;
4317 bed
= get_elf_backend_data (finfo
->output_bfd
);
4318 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4319 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4321 eoinfo
->failed
= true;
4326 /* If this symbol should be put in the .dynsym section, then put it
4327 there now. We have already know the symbol index. We also fill
4328 in the entry in the .hash section. */
4329 if (h
->dynindx
!= -1
4330 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4336 bfd_byte
*bucketpos
;
4339 sym
.st_name
= h
->dynstr_index
;
4341 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4342 (PTR
) (((Elf_External_Sym
*)
4343 finfo
->dynsym_sec
->contents
)
4346 /* We didn't include the version string in the dynamic string
4347 table, so we must not consider it in the hash table. */
4348 name
= h
->root
.root
.string
;
4349 p
= strchr (name
, ELF_VER_CHR
);
4354 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4355 strncpy (copy
, name
, p
- name
);
4356 copy
[p
- name
] = '\0';
4360 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4361 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4362 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4363 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4364 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4365 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4366 put_word (finfo
->output_bfd
, chain
,
4367 ((bfd_byte
*) finfo
->hash_sec
->contents
4368 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4371 bfd_release (finfo
->output_bfd
, copy
);
4373 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4375 Elf_Internal_Versym iversym
;
4377 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4379 if (h
->verinfo
.verdef
== NULL
)
4380 iversym
.vs_vers
= 0;
4382 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4386 if (h
->verinfo
.vertree
== NULL
)
4387 iversym
.vs_vers
= 1;
4389 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4392 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4393 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4395 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4396 (((Elf_External_Versym
*)
4397 finfo
->symver_sec
->contents
)
4402 /* If we're stripping it, then it was just a dynamic symbol, and
4403 there's nothing else to do. */
4407 h
->indx
= finfo
->output_bfd
->symcount
;
4409 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4411 eoinfo
->failed
= true;
4418 /* Link an input file into the linker output file. This function
4419 handles all the sections and relocations of the input file at once.
4420 This is so that we only have to read the local symbols once, and
4421 don't have to keep them in memory. */
4424 elf_link_input_bfd (finfo
, input_bfd
)
4425 struct elf_final_link_info
*finfo
;
4428 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4429 bfd
*, asection
*, bfd_byte
*,
4430 Elf_Internal_Rela
*,
4431 Elf_Internal_Sym
*, asection
**));
4433 Elf_Internal_Shdr
*symtab_hdr
;
4436 Elf_External_Sym
*external_syms
;
4437 Elf_External_Sym
*esym
;
4438 Elf_External_Sym
*esymend
;
4439 Elf_Internal_Sym
*isym
;
4441 asection
**ppsection
;
4444 output_bfd
= finfo
->output_bfd
;
4446 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4448 /* If this is a dynamic object, we don't want to do anything here:
4449 we don't want the local symbols, and we don't want the section
4451 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4454 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4455 if (elf_bad_symtab (input_bfd
))
4457 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4462 locsymcount
= symtab_hdr
->sh_info
;
4463 extsymoff
= symtab_hdr
->sh_info
;
4466 /* Read the local symbols. */
4467 if (symtab_hdr
->contents
!= NULL
)
4468 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4469 else if (locsymcount
== 0)
4470 external_syms
= NULL
;
4473 external_syms
= finfo
->external_syms
;
4474 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4475 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4476 locsymcount
, input_bfd
)
4477 != locsymcount
* sizeof (Elf_External_Sym
)))
4481 /* Swap in the local symbols and write out the ones which we know
4482 are going into the output file. */
4483 esym
= external_syms
;
4484 esymend
= esym
+ locsymcount
;
4485 isym
= finfo
->internal_syms
;
4486 pindex
= finfo
->indices
;
4487 ppsection
= finfo
->sections
;
4488 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4492 Elf_Internal_Sym osym
;
4494 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4497 if (elf_bad_symtab (input_bfd
))
4499 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4506 if (isym
->st_shndx
== SHN_UNDEF
)
4507 isec
= bfd_und_section_ptr
;
4508 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4509 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4510 else if (isym
->st_shndx
== SHN_ABS
)
4511 isec
= bfd_abs_section_ptr
;
4512 else if (isym
->st_shndx
== SHN_COMMON
)
4513 isec
= bfd_com_section_ptr
;
4522 /* Don't output the first, undefined, symbol. */
4523 if (esym
== external_syms
)
4526 /* If we are stripping all symbols, we don't want to output this
4528 if (finfo
->info
->strip
== strip_all
)
4531 /* We never output section symbols. Instead, we use the section
4532 symbol of the corresponding section in the output file. */
4533 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4536 /* If we are discarding all local symbols, we don't want to
4537 output this one. If we are generating a relocateable output
4538 file, then some of the local symbols may be required by
4539 relocs; we output them below as we discover that they are
4541 if (finfo
->info
->discard
== discard_all
)
4544 /* If this symbol is defined in a section which we are
4545 discarding, we don't need to keep it, but note that
4546 linker_mark is only reliable for sections that have contents.
4547 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4548 as well as linker_mark. */
4549 if (isym
->st_shndx
> 0
4550 && isym
->st_shndx
< SHN_LORESERVE
4552 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4553 || (! finfo
->info
->relocateable
4554 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4557 /* Get the name of the symbol. */
4558 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4563 /* See if we are discarding symbols with this name. */
4564 if ((finfo
->info
->strip
== strip_some
4565 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4567 || (finfo
->info
->discard
== discard_l
4568 && bfd_is_local_label_name (input_bfd
, name
)))
4571 /* If we get here, we are going to output this symbol. */
4575 /* Adjust the section index for the output file. */
4576 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4577 isec
->output_section
);
4578 if (osym
.st_shndx
== (unsigned short) -1)
4581 *pindex
= output_bfd
->symcount
;
4583 /* ELF symbols in relocateable files are section relative, but
4584 in executable files they are virtual addresses. Note that
4585 this code assumes that all ELF sections have an associated
4586 BFD section with a reasonable value for output_offset; below
4587 we assume that they also have a reasonable value for
4588 output_section. Any special sections must be set up to meet
4589 these requirements. */
4590 osym
.st_value
+= isec
->output_offset
;
4591 if (! finfo
->info
->relocateable
)
4592 osym
.st_value
+= isec
->output_section
->vma
;
4594 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4598 /* Relocate the contents of each section. */
4599 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4603 if (! o
->linker_mark
)
4605 /* This section was omitted from the link. */
4609 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4610 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4613 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4615 /* Section was created by elf_link_create_dynamic_sections
4620 /* Get the contents of the section. They have been cached by a
4621 relaxation routine. Note that o is a section in an input
4622 file, so the contents field will not have been set by any of
4623 the routines which work on output files. */
4624 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4625 contents
= elf_section_data (o
)->this_hdr
.contents
;
4628 contents
= finfo
->contents
;
4629 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4630 (file_ptr
) 0, o
->_raw_size
))
4634 if ((o
->flags
& SEC_RELOC
) != 0)
4636 Elf_Internal_Rela
*internal_relocs
;
4638 /* Get the swapped relocs. */
4639 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4640 (input_bfd
, o
, finfo
->external_relocs
,
4641 finfo
->internal_relocs
, false));
4642 if (internal_relocs
== NULL
4643 && o
->reloc_count
> 0)
4646 /* Relocate the section by invoking a back end routine.
4648 The back end routine is responsible for adjusting the
4649 section contents as necessary, and (if using Rela relocs
4650 and generating a relocateable output file) adjusting the
4651 reloc addend as necessary.
4653 The back end routine does not have to worry about setting
4654 the reloc address or the reloc symbol index.
4656 The back end routine is given a pointer to the swapped in
4657 internal symbols, and can access the hash table entries
4658 for the external symbols via elf_sym_hashes (input_bfd).
4660 When generating relocateable output, the back end routine
4661 must handle STB_LOCAL/STT_SECTION symbols specially. The
4662 output symbol is going to be a section symbol
4663 corresponding to the output section, which will require
4664 the addend to be adjusted. */
4666 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4667 input_bfd
, o
, contents
,
4669 finfo
->internal_syms
,
4673 if (finfo
->info
->relocateable
)
4675 Elf_Internal_Rela
*irela
;
4676 Elf_Internal_Rela
*irelaend
;
4677 struct elf_link_hash_entry
**rel_hash
;
4678 Elf_Internal_Shdr
*input_rel_hdr
;
4679 Elf_Internal_Shdr
*output_rel_hdr
;
4681 /* Adjust the reloc addresses and symbol indices. */
4683 irela
= internal_relocs
;
4684 irelaend
= irela
+ o
->reloc_count
;
4685 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4686 + o
->output_section
->reloc_count
);
4687 for (; irela
< irelaend
; irela
++, rel_hash
++)
4689 unsigned long r_symndx
;
4690 Elf_Internal_Sym
*isym
;
4693 irela
->r_offset
+= o
->output_offset
;
4695 r_symndx
= ELF_R_SYM (irela
->r_info
);
4700 if (r_symndx
>= locsymcount
4701 || (elf_bad_symtab (input_bfd
)
4702 && finfo
->sections
[r_symndx
] == NULL
))
4706 /* This is a reloc against a global symbol. We
4707 have not yet output all the local symbols, so
4708 we do not know the symbol index of any global
4709 symbol. We set the rel_hash entry for this
4710 reloc to point to the global hash table entry
4711 for this symbol. The symbol index is then
4712 set at the end of elf_bfd_final_link. */
4713 indx
= r_symndx
- extsymoff
;
4714 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
4716 /* Setting the index to -2 tells
4717 elf_link_output_extsym that this symbol is
4719 BFD_ASSERT ((*rel_hash
)->indx
< 0);
4720 (*rel_hash
)->indx
= -2;
4725 /* This is a reloc against a local symbol. */
4728 isym
= finfo
->internal_syms
+ r_symndx
;
4729 sec
= finfo
->sections
[r_symndx
];
4730 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4732 /* I suppose the backend ought to fill in the
4733 section of any STT_SECTION symbol against a
4734 processor specific section. If we have
4735 discarded a section, the output_section will
4736 be the absolute section. */
4738 && (bfd_is_abs_section (sec
)
4739 || (sec
->output_section
!= NULL
4740 && bfd_is_abs_section (sec
->output_section
))))
4742 else if (sec
== NULL
|| sec
->owner
== NULL
)
4744 bfd_set_error (bfd_error_bad_value
);
4749 r_symndx
= sec
->output_section
->target_index
;
4750 BFD_ASSERT (r_symndx
!= 0);
4755 if (finfo
->indices
[r_symndx
] == -1)
4761 if (finfo
->info
->strip
== strip_all
)
4763 /* You can't do ld -r -s. */
4764 bfd_set_error (bfd_error_invalid_operation
);
4768 /* This symbol was skipped earlier, but
4769 since it is needed by a reloc, we
4770 must output it now. */
4771 link
= symtab_hdr
->sh_link
;
4772 name
= bfd_elf_string_from_elf_section (input_bfd
,
4778 osec
= sec
->output_section
;
4780 _bfd_elf_section_from_bfd_section (output_bfd
,
4782 if (isym
->st_shndx
== (unsigned short) -1)
4785 isym
->st_value
+= sec
->output_offset
;
4786 if (! finfo
->info
->relocateable
)
4787 isym
->st_value
+= osec
->vma
;
4789 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4791 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4795 r_symndx
= finfo
->indices
[r_symndx
];
4798 irela
->r_info
= ELF_R_INFO (r_symndx
,
4799 ELF_R_TYPE (irela
->r_info
));
4802 /* Swap out the relocs. */
4803 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4804 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4805 BFD_ASSERT (output_rel_hdr
->sh_entsize
4806 == input_rel_hdr
->sh_entsize
);
4807 irela
= internal_relocs
;
4808 irelaend
= irela
+ o
->reloc_count
;
4809 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4811 Elf_External_Rel
*erel
;
4813 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4814 + o
->output_section
->reloc_count
);
4815 for (; irela
< irelaend
; irela
++, erel
++)
4817 Elf_Internal_Rel irel
;
4819 irel
.r_offset
= irela
->r_offset
;
4820 irel
.r_info
= irela
->r_info
;
4821 BFD_ASSERT (irela
->r_addend
== 0);
4822 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4827 Elf_External_Rela
*erela
;
4829 BFD_ASSERT (input_rel_hdr
->sh_entsize
4830 == sizeof (Elf_External_Rela
));
4831 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4832 + o
->output_section
->reloc_count
);
4833 for (; irela
< irelaend
; irela
++, erela
++)
4834 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4837 o
->output_section
->reloc_count
+= o
->reloc_count
;
4841 /* Write out the modified section contents. */
4842 if (elf_section_data (o
)->stab_info
== NULL
)
4844 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
4845 contents
, o
->output_offset
,
4846 (o
->_cooked_size
!= 0
4853 if (! (_bfd_write_section_stabs
4854 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4855 o
, &elf_section_data (o
)->stab_info
, contents
)))
4863 /* Generate a reloc when linking an ELF file. This is a reloc
4864 requested by the linker, and does come from any input file. This
4865 is used to build constructor and destructor tables when linking
4869 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4871 struct bfd_link_info
*info
;
4872 asection
*output_section
;
4873 struct bfd_link_order
*link_order
;
4875 reloc_howto_type
*howto
;
4879 struct elf_link_hash_entry
**rel_hash_ptr
;
4880 Elf_Internal_Shdr
*rel_hdr
;
4882 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4885 bfd_set_error (bfd_error_bad_value
);
4889 addend
= link_order
->u
.reloc
.p
->addend
;
4891 /* Figure out the symbol index. */
4892 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4893 + output_section
->reloc_count
);
4894 if (link_order
->type
== bfd_section_reloc_link_order
)
4896 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4897 BFD_ASSERT (indx
!= 0);
4898 *rel_hash_ptr
= NULL
;
4902 struct elf_link_hash_entry
*h
;
4904 /* Treat a reloc against a defined symbol as though it were
4905 actually against the section. */
4906 h
= ((struct elf_link_hash_entry
*)
4907 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4908 link_order
->u
.reloc
.p
->u
.name
,
4909 false, false, true));
4911 && (h
->root
.type
== bfd_link_hash_defined
4912 || h
->root
.type
== bfd_link_hash_defweak
))
4916 section
= h
->root
.u
.def
.section
;
4917 indx
= section
->output_section
->target_index
;
4918 *rel_hash_ptr
= NULL
;
4919 /* It seems that we ought to add the symbol value to the
4920 addend here, but in practice it has already been added
4921 because it was passed to constructor_callback. */
4922 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4926 /* Setting the index to -2 tells elf_link_output_extsym that
4927 this symbol is used by a reloc. */
4934 if (! ((*info
->callbacks
->unattached_reloc
)
4935 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
4936 (asection
*) NULL
, (bfd_vma
) 0)))
4942 /* If this is an inplace reloc, we must write the addend into the
4944 if (howto
->partial_inplace
&& addend
!= 0)
4947 bfd_reloc_status_type rstat
;
4951 size
= bfd_get_reloc_size (howto
);
4952 buf
= (bfd_byte
*) bfd_zmalloc (size
);
4953 if (buf
== (bfd_byte
*) NULL
)
4955 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
4961 case bfd_reloc_outofrange
:
4963 case bfd_reloc_overflow
:
4964 if (! ((*info
->callbacks
->reloc_overflow
)
4966 (link_order
->type
== bfd_section_reloc_link_order
4967 ? bfd_section_name (output_bfd
,
4968 link_order
->u
.reloc
.p
->u
.section
)
4969 : link_order
->u
.reloc
.p
->u
.name
),
4970 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
4978 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
4979 (file_ptr
) link_order
->offset
, size
);
4985 /* The address of a reloc is relative to the section in a
4986 relocateable file, and is a virtual address in an executable
4988 offset
= link_order
->offset
;
4989 if (! info
->relocateable
)
4990 offset
+= output_section
->vma
;
4992 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
4994 if (rel_hdr
->sh_type
== SHT_REL
)
4996 Elf_Internal_Rel irel
;
4997 Elf_External_Rel
*erel
;
4999 irel
.r_offset
= offset
;
5000 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5001 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5002 + output_section
->reloc_count
);
5003 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5007 Elf_Internal_Rela irela
;
5008 Elf_External_Rela
*erela
;
5010 irela
.r_offset
= offset
;
5011 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5012 irela
.r_addend
= addend
;
5013 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5014 + output_section
->reloc_count
);
5015 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5018 ++output_section
->reloc_count
;
5024 /* Allocate a pointer to live in a linker created section. */
5027 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5029 struct bfd_link_info
*info
;
5030 elf_linker_section_t
*lsect
;
5031 struct elf_link_hash_entry
*h
;
5032 const Elf_Internal_Rela
*rel
;
5034 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5035 elf_linker_section_pointers_t
*linker_section_ptr
;
5036 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5038 BFD_ASSERT (lsect
!= NULL
);
5040 /* Is this a global symbol? */
5043 /* Has this symbol already been allocated, if so, our work is done */
5044 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5049 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5050 /* Make sure this symbol is output as a dynamic symbol. */
5051 if (h
->dynindx
== -1)
5053 if (! elf_link_record_dynamic_symbol (info
, h
))
5057 if (lsect
->rel_section
)
5058 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5061 else /* Allocation of a pointer to a local symbol */
5063 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5065 /* Allocate a table to hold the local symbols if first time */
5068 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5069 register unsigned int i
;
5071 ptr
= (elf_linker_section_pointers_t
**)
5072 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5077 elf_local_ptr_offsets (abfd
) = ptr
;
5078 for (i
= 0; i
< num_symbols
; i
++)
5079 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5082 /* Has this symbol already been allocated, if so, our work is done */
5083 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5088 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5092 /* If we are generating a shared object, we need to
5093 output a R_<xxx>_RELATIVE reloc so that the
5094 dynamic linker can adjust this GOT entry. */
5095 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5096 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5100 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5101 from internal memory. */
5102 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5103 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5104 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5106 if (!linker_section_ptr
)
5109 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5110 linker_section_ptr
->addend
= rel
->r_addend
;
5111 linker_section_ptr
->which
= lsect
->which
;
5112 linker_section_ptr
->written_address_p
= false;
5113 *ptr_linker_section_ptr
= linker_section_ptr
;
5116 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5118 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5119 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5120 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5121 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5123 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5125 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5126 lsect
->sym_hash
->root
.root
.string
,
5127 (long)ARCH_SIZE
/ 8,
5128 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5134 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5136 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5139 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5140 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5148 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5151 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5154 /* Fill in the address for a pointer generated in alinker section. */
5157 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5160 struct bfd_link_info
*info
;
5161 elf_linker_section_t
*lsect
;
5162 struct elf_link_hash_entry
*h
;
5164 const Elf_Internal_Rela
*rel
;
5167 elf_linker_section_pointers_t
*linker_section_ptr
;
5169 BFD_ASSERT (lsect
!= NULL
);
5171 if (h
!= NULL
) /* global symbol */
5173 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5177 BFD_ASSERT (linker_section_ptr
!= NULL
);
5179 if (! elf_hash_table (info
)->dynamic_sections_created
5182 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5184 /* This is actually a static link, or it is a
5185 -Bsymbolic link and the symbol is defined
5186 locally. We must initialize this entry in the
5189 When doing a dynamic link, we create a .rela.<xxx>
5190 relocation entry to initialize the value. This
5191 is done in the finish_dynamic_symbol routine. */
5192 if (!linker_section_ptr
->written_address_p
)
5194 linker_section_ptr
->written_address_p
= true;
5195 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5196 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5200 else /* local symbol */
5202 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5203 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5204 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5205 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5209 BFD_ASSERT (linker_section_ptr
!= NULL
);
5211 /* Write out pointer if it hasn't been rewritten out before */
5212 if (!linker_section_ptr
->written_address_p
)
5214 linker_section_ptr
->written_address_p
= true;
5215 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5216 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5220 asection
*srel
= lsect
->rel_section
;
5221 Elf_Internal_Rela outrel
;
5223 /* We need to generate a relative reloc for the dynamic linker. */
5225 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5228 BFD_ASSERT (srel
!= NULL
);
5230 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5231 + lsect
->section
->output_offset
5232 + linker_section_ptr
->offset
);
5233 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5234 outrel
.r_addend
= 0;
5235 elf_swap_reloca_out (output_bfd
, &outrel
,
5236 (((Elf_External_Rela
*)
5237 lsect
->section
->contents
)
5238 + lsect
->section
->reloc_count
));
5239 ++lsect
->section
->reloc_count
;
5244 relocation
= (lsect
->section
->output_offset
5245 + linker_section_ptr
->offset
5246 - lsect
->hole_offset
5247 - lsect
->sym_offset
);
5250 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5251 lsect
->name
, (long)relocation
, (long)relocation
);
5254 /* Subtract out the addend, because it will get added back in by the normal
5256 return relocation
- linker_section_ptr
->addend
;