2 Copyright 1995, 1996, 1997, 1998, 1999 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
));
53 static boolean elf_collect_hash_codes
54 PARAMS ((struct elf_link_hash_entry
*, PTR
));
55 static boolean elf_link_read_relocs_from_section
56 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
57 static void elf_link_remove_section_and_adjust_dynindices
58 PARAMS ((struct bfd_link_info
*, asection
*));
60 /* Given an ELF BFD, add symbols to the global hash table as
64 elf_bfd_link_add_symbols (abfd
, info
)
66 struct bfd_link_info
*info
;
68 switch (bfd_get_format (abfd
))
71 return elf_link_add_object_symbols (abfd
, info
);
73 return elf_link_add_archive_symbols (abfd
, info
);
75 bfd_set_error (bfd_error_wrong_format
);
81 /* Add symbols from an ELF archive file to the linker hash table. We
82 don't use _bfd_generic_link_add_archive_symbols because of a
83 problem which arises on UnixWare. The UnixWare libc.so is an
84 archive which includes an entry libc.so.1 which defines a bunch of
85 symbols. The libc.so archive also includes a number of other
86 object files, which also define symbols, some of which are the same
87 as those defined in libc.so.1. Correct linking requires that we
88 consider each object file in turn, and include it if it defines any
89 symbols we need. _bfd_generic_link_add_archive_symbols does not do
90 this; it looks through the list of undefined symbols, and includes
91 any object file which defines them. When this algorithm is used on
92 UnixWare, it winds up pulling in libc.so.1 early and defining a
93 bunch of symbols. This means that some of the other objects in the
94 archive are not included in the link, which is incorrect since they
95 precede libc.so.1 in the archive.
97 Fortunately, ELF archive handling is simpler than that done by
98 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
99 oddities. In ELF, if we find a symbol in the archive map, and the
100 symbol is currently undefined, we know that we must pull in that
103 Unfortunately, we do have to make multiple passes over the symbol
104 table until nothing further is resolved. */
107 elf_link_add_archive_symbols (abfd
, info
)
109 struct bfd_link_info
*info
;
112 boolean
*defined
= NULL
;
113 boolean
*included
= NULL
;
117 if (! bfd_has_map (abfd
))
119 /* An empty archive is a special case. */
120 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
122 bfd_set_error (bfd_error_no_armap
);
126 /* Keep track of all symbols we know to be already defined, and all
127 files we know to be already included. This is to speed up the
128 second and subsequent passes. */
129 c
= bfd_ardata (abfd
)->symdef_count
;
132 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
133 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
134 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
136 memset (defined
, 0, c
* sizeof (boolean
));
137 memset (included
, 0, c
* sizeof (boolean
));
139 symdefs
= bfd_ardata (abfd
)->symdefs
;
152 symdefend
= symdef
+ c
;
153 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
155 struct elf_link_hash_entry
*h
;
157 struct bfd_link_hash_entry
*undefs_tail
;
160 if (defined
[i
] || included
[i
])
162 if (symdef
->file_offset
== last
)
168 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
169 false, false, false);
175 /* If this is a default version (the name contains @@),
176 look up the symbol again without the version. The
177 effect is that references to the symbol without the
178 version will be matched by the default symbol in the
181 p
= strchr (symdef
->name
, ELF_VER_CHR
);
182 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
185 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
188 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
189 copy
[p
- symdef
->name
] = '\0';
191 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
192 false, false, false);
194 bfd_release (abfd
, copy
);
200 if (h
->root
.type
!= bfd_link_hash_undefined
)
202 if (h
->root
.type
!= bfd_link_hash_undefweak
)
207 /* We need to include this archive member. */
209 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
210 if (element
== (bfd
*) NULL
)
213 if (! bfd_check_format (element
, bfd_object
))
216 /* Doublecheck that we have not included this object
217 already--it should be impossible, but there may be
218 something wrong with the archive. */
219 if (element
->archive_pass
!= 0)
221 bfd_set_error (bfd_error_bad_value
);
224 element
->archive_pass
= 1;
226 undefs_tail
= info
->hash
->undefs_tail
;
228 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
231 if (! elf_link_add_object_symbols (element
, info
))
234 /* If there are any new undefined symbols, we need to make
235 another pass through the archive in order to see whether
236 they can be defined. FIXME: This isn't perfect, because
237 common symbols wind up on undefs_tail and because an
238 undefined symbol which is defined later on in this pass
239 does not require another pass. This isn't a bug, but it
240 does make the code less efficient than it could be. */
241 if (undefs_tail
!= info
->hash
->undefs_tail
)
244 /* Look backward to mark all symbols from this object file
245 which we have already seen in this pass. */
249 included
[mark
] = true;
254 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
256 /* We mark subsequent symbols from this object file as we go
257 on through the loop. */
258 last
= symdef
->file_offset
;
269 if (defined
!= (boolean
*) NULL
)
271 if (included
!= (boolean
*) NULL
)
276 /* This function is called when we want to define a new symbol. It
277 handles the various cases which arise when we find a definition in
278 a dynamic object, or when there is already a definition in a
279 dynamic object. The new symbol is described by NAME, SYM, PSEC,
280 and PVALUE. We set SYM_HASH to the hash table entry. We set
281 OVERRIDE if the old symbol is overriding a new definition. We set
282 TYPE_CHANGE_OK if it is OK for the type to change. We set
283 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
284 change, we mean that we shouldn't warn if the type or size does
288 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
289 override
, type_change_ok
, size_change_ok
)
291 struct bfd_link_info
*info
;
293 Elf_Internal_Sym
*sym
;
296 struct elf_link_hash_entry
**sym_hash
;
298 boolean
*type_change_ok
;
299 boolean
*size_change_ok
;
302 struct elf_link_hash_entry
*h
;
305 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
310 bind
= ELF_ST_BIND (sym
->st_info
);
312 if (! bfd_is_und_section (sec
))
313 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
315 h
= ((struct elf_link_hash_entry
*)
316 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
321 /* This code is for coping with dynamic objects, and is only useful
322 if we are doing an ELF link. */
323 if (info
->hash
->creator
!= abfd
->xvec
)
326 /* For merging, we only care about real symbols. */
328 while (h
->root
.type
== bfd_link_hash_indirect
329 || h
->root
.type
== bfd_link_hash_warning
)
330 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
332 /* If we just created the symbol, mark it as being an ELF symbol.
333 Other than that, there is nothing to do--there is no merge issue
334 with a newly defined symbol--so we just return. */
336 if (h
->root
.type
== bfd_link_hash_new
)
338 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
342 /* OLDBFD is a BFD associated with the existing symbol. */
344 switch (h
->root
.type
)
350 case bfd_link_hash_undefined
:
351 case bfd_link_hash_undefweak
:
352 oldbfd
= h
->root
.u
.undef
.abfd
;
355 case bfd_link_hash_defined
:
356 case bfd_link_hash_defweak
:
357 oldbfd
= h
->root
.u
.def
.section
->owner
;
360 case bfd_link_hash_common
:
361 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
365 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
366 respectively, is from a dynamic object. */
368 if ((abfd
->flags
& DYNAMIC
) != 0)
373 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
378 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
379 respectively, appear to be a definition rather than reference. */
381 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
386 if (h
->root
.type
== bfd_link_hash_undefined
387 || h
->root
.type
== bfd_link_hash_undefweak
388 || h
->root
.type
== bfd_link_hash_common
)
393 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
394 symbol, respectively, appears to be a common symbol in a dynamic
395 object. If a symbol appears in an uninitialized section, and is
396 not weak, and is not a function, then it may be a common symbol
397 which was resolved when the dynamic object was created. We want
398 to treat such symbols specially, because they raise special
399 considerations when setting the symbol size: if the symbol
400 appears as a common symbol in a regular object, and the size in
401 the regular object is larger, we must make sure that we use the
402 larger size. This problematic case can always be avoided in C,
403 but it must be handled correctly when using Fortran shared
406 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
407 likewise for OLDDYNCOMMON and OLDDEF.
409 Note that this test is just a heuristic, and that it is quite
410 possible to have an uninitialized symbol in a shared object which
411 is really a definition, rather than a common symbol. This could
412 lead to some minor confusion when the symbol really is a common
413 symbol in some regular object. However, I think it will be
418 && (sec
->flags
& SEC_ALLOC
) != 0
419 && (sec
->flags
& SEC_LOAD
) == 0
422 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
425 newdyncommon
= false;
429 && h
->root
.type
== bfd_link_hash_defined
430 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
431 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
432 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
434 && h
->type
!= STT_FUNC
)
437 olddyncommon
= false;
439 /* It's OK to change the type if either the existing symbol or the
440 new symbol is weak. */
442 if (h
->root
.type
== bfd_link_hash_defweak
443 || h
->root
.type
== bfd_link_hash_undefweak
445 *type_change_ok
= true;
447 /* It's OK to change the size if either the existing symbol or the
448 new symbol is weak, or if the old symbol is undefined. */
451 || h
->root
.type
== bfd_link_hash_undefined
)
452 *size_change_ok
= true;
454 /* If both the old and the new symbols look like common symbols in a
455 dynamic object, set the size of the symbol to the larger of the
460 && sym
->st_size
!= h
->size
)
462 /* Since we think we have two common symbols, issue a multiple
463 common warning if desired. Note that we only warn if the
464 size is different. If the size is the same, we simply let
465 the old symbol override the new one as normally happens with
466 symbols defined in dynamic objects. */
468 if (! ((*info
->callbacks
->multiple_common
)
469 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
470 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
473 if (sym
->st_size
> h
->size
)
474 h
->size
= sym
->st_size
;
476 *size_change_ok
= true;
479 /* If we are looking at a dynamic object, and we have found a
480 definition, we need to see if the symbol was already defined by
481 some other object. If so, we want to use the existing
482 definition, and we do not want to report a multiple symbol
483 definition error; we do this by clobbering *PSEC to be
486 We treat a common symbol as a definition if the symbol in the
487 shared library is a function, since common symbols always
488 represent variables; this can cause confusion in principle, but
489 any such confusion would seem to indicate an erroneous program or
490 shared library. We also permit a common symbol in a regular
491 object to override a weak symbol in a shared object. */
496 || (h
->root
.type
== bfd_link_hash_common
498 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
502 newdyncommon
= false;
504 *psec
= sec
= bfd_und_section_ptr
;
505 *size_change_ok
= true;
507 /* If we get here when the old symbol is a common symbol, then
508 we are explicitly letting it override a weak symbol or
509 function in a dynamic object, and we don't want to warn about
510 a type change. If the old symbol is a defined symbol, a type
511 change warning may still be appropriate. */
513 if (h
->root
.type
== bfd_link_hash_common
)
514 *type_change_ok
= true;
517 /* Handle the special case of an old common symbol merging with a
518 new symbol which looks like a common symbol in a shared object.
519 We change *PSEC and *PVALUE to make the new symbol look like a
520 common symbol, and let _bfd_generic_link_add_one_symbol will do
524 && h
->root
.type
== bfd_link_hash_common
)
528 newdyncommon
= false;
529 *pvalue
= sym
->st_size
;
530 *psec
= sec
= bfd_com_section_ptr
;
531 *size_change_ok
= true;
534 /* If the old symbol is from a dynamic object, and the new symbol is
535 a definition which is not from a dynamic object, then the new
536 symbol overrides the old symbol. Symbols from regular files
537 always take precedence over symbols from dynamic objects, even if
538 they are defined after the dynamic object in the link.
540 As above, we again permit a common symbol in a regular object to
541 override a definition in a shared object if the shared object
542 symbol is a function or is weak. */
546 || (bfd_is_com_section (sec
)
547 && (h
->root
.type
== bfd_link_hash_defweak
548 || h
->type
== STT_FUNC
)))
551 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
553 /* Change the hash table entry to undefined, and let
554 _bfd_generic_link_add_one_symbol do the right thing with the
557 h
->root
.type
= bfd_link_hash_undefined
;
558 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
559 *size_change_ok
= true;
562 olddyncommon
= false;
564 /* We again permit a type change when a common symbol may be
565 overriding a function. */
567 if (bfd_is_com_section (sec
))
568 *type_change_ok
= true;
570 /* This union may have been set to be non-NULL when this symbol
571 was seen in a dynamic object. We must force the union to be
572 NULL, so that it is correct for a regular symbol. */
574 h
->verinfo
.vertree
= NULL
;
576 /* In this special case, if H is the target of an indirection,
577 we want the caller to frob with H rather than with the
578 indirect symbol. That will permit the caller to redefine the
579 target of the indirection, rather than the indirect symbol
580 itself. FIXME: This will break the -y option if we store a
581 symbol with a different name. */
585 /* Handle the special case of a new common symbol merging with an
586 old symbol that looks like it might be a common symbol defined in
587 a shared object. Note that we have already handled the case in
588 which a new common symbol should simply override the definition
589 in the shared library. */
592 && bfd_is_com_section (sec
)
595 /* It would be best if we could set the hash table entry to a
596 common symbol, but we don't know what to use for the section
598 if (! ((*info
->callbacks
->multiple_common
)
599 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
600 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
603 /* If the predumed common symbol in the dynamic object is
604 larger, pretend that the new symbol has its size. */
606 if (h
->size
> *pvalue
)
609 /* FIXME: We no longer know the alignment required by the symbol
610 in the dynamic object, so we just wind up using the one from
611 the regular object. */
614 olddyncommon
= false;
616 h
->root
.type
= bfd_link_hash_undefined
;
617 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
619 *size_change_ok
= true;
620 *type_change_ok
= true;
622 h
->verinfo
.vertree
= NULL
;
628 /* Add symbols from an ELF object file to the linker hash table. */
631 elf_link_add_object_symbols (abfd
, info
)
633 struct bfd_link_info
*info
;
635 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
636 const Elf_Internal_Sym
*,
637 const char **, flagword
*,
638 asection
**, bfd_vma
*));
639 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
640 asection
*, const Elf_Internal_Rela
*));
642 Elf_Internal_Shdr
*hdr
;
646 Elf_External_Sym
*buf
= NULL
;
647 struct elf_link_hash_entry
**sym_hash
;
649 bfd_byte
*dynver
= NULL
;
650 Elf_External_Versym
*extversym
= NULL
;
651 Elf_External_Versym
*ever
;
652 Elf_External_Dyn
*dynbuf
= NULL
;
653 struct elf_link_hash_entry
*weaks
;
654 Elf_External_Sym
*esym
;
655 Elf_External_Sym
*esymend
;
657 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
658 collect
= get_elf_backend_data (abfd
)->collect
;
660 if ((abfd
->flags
& DYNAMIC
) == 0)
666 /* You can't use -r against a dynamic object. Also, there's no
667 hope of using a dynamic object which does not exactly match
668 the format of the output file. */
669 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
671 bfd_set_error (bfd_error_invalid_operation
);
676 /* As a GNU extension, any input sections which are named
677 .gnu.warning.SYMBOL are treated as warning symbols for the given
678 symbol. This differs from .gnu.warning sections, which generate
679 warnings when they are included in an output file. */
684 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
688 name
= bfd_get_section_name (abfd
, s
);
689 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
694 name
+= sizeof ".gnu.warning." - 1;
696 /* If this is a shared object, then look up the symbol
697 in the hash table. If it is there, and it is already
698 been defined, then we will not be using the entry
699 from this shared object, so we don't need to warn.
700 FIXME: If we see the definition in a regular object
701 later on, we will warn, but we shouldn't. The only
702 fix is to keep track of what warnings we are supposed
703 to emit, and then handle them all at the end of the
705 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
707 struct elf_link_hash_entry
*h
;
709 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
712 /* FIXME: What about bfd_link_hash_common? */
714 && (h
->root
.type
== bfd_link_hash_defined
715 || h
->root
.type
== bfd_link_hash_defweak
))
717 /* We don't want to issue this warning. Clobber
718 the section size so that the warning does not
719 get copied into the output file. */
725 sz
= bfd_section_size (abfd
, s
);
726 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
730 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
735 if (! (_bfd_generic_link_add_one_symbol
736 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
737 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
740 if (! info
->relocateable
)
742 /* Clobber the section size so that the warning does
743 not get copied into the output file. */
750 /* If this is a dynamic object, we always link against the .dynsym
751 symbol table, not the .symtab symbol table. The dynamic linker
752 will only see the .dynsym symbol table, so there is no reason to
753 look at .symtab for a dynamic object. */
755 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
756 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
758 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
762 /* Read in any version definitions. */
764 if (! _bfd_elf_slurp_version_tables (abfd
))
767 /* Read in the symbol versions, but don't bother to convert them
768 to internal format. */
769 if (elf_dynversym (abfd
) != 0)
771 Elf_Internal_Shdr
*versymhdr
;
773 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
774 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
775 if (extversym
== NULL
)
777 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
778 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
779 != versymhdr
->sh_size
))
784 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
786 /* The sh_info field of the symtab header tells us where the
787 external symbols start. We don't care about the local symbols at
789 if (elf_bad_symtab (abfd
))
791 extsymcount
= symcount
;
796 extsymcount
= symcount
- hdr
->sh_info
;
797 extsymoff
= hdr
->sh_info
;
800 buf
= ((Elf_External_Sym
*)
801 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
802 if (buf
== NULL
&& extsymcount
!= 0)
805 /* We store a pointer to the hash table entry for each external
807 sym_hash
= ((struct elf_link_hash_entry
**)
809 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
810 if (sym_hash
== NULL
)
812 elf_sym_hashes (abfd
) = sym_hash
;
816 /* If we are creating a shared library, create all the dynamic
817 sections immediately. We need to attach them to something,
818 so we attach them to this BFD, provided it is the right
819 format. FIXME: If there are no input BFD's of the same
820 format as the output, we can't make a shared library. */
822 && ! elf_hash_table (info
)->dynamic_sections_created
823 && abfd
->xvec
== info
->hash
->creator
)
825 if (! elf_link_create_dynamic_sections (abfd
, info
))
834 bfd_size_type oldsize
;
835 bfd_size_type strindex
;
837 /* Find the name to use in a DT_NEEDED entry that refers to this
838 object. If the object has a DT_SONAME entry, we use it.
839 Otherwise, if the generic linker stuck something in
840 elf_dt_name, we use that. Otherwise, we just use the file
841 name. If the generic linker put a null string into
842 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
843 there is a DT_SONAME entry. */
845 name
= bfd_get_filename (abfd
);
846 if (elf_dt_name (abfd
) != NULL
)
848 name
= elf_dt_name (abfd
);
852 s
= bfd_get_section_by_name (abfd
, ".dynamic");
855 Elf_External_Dyn
*extdyn
;
856 Elf_External_Dyn
*extdynend
;
860 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
864 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
865 (file_ptr
) 0, s
->_raw_size
))
868 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
871 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
874 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
875 for (; extdyn
< extdynend
; extdyn
++)
877 Elf_Internal_Dyn dyn
;
879 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
880 if (dyn
.d_tag
== DT_SONAME
)
882 name
= bfd_elf_string_from_elf_section (abfd
, link
,
887 if (dyn
.d_tag
== DT_NEEDED
)
889 struct bfd_link_needed_list
*n
, **pn
;
892 n
= ((struct bfd_link_needed_list
*)
893 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
894 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
896 if (n
== NULL
|| fnm
== NULL
)
898 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
905 for (pn
= &elf_hash_table (info
)->needed
;
917 /* We do not want to include any of the sections in a dynamic
918 object in the output file. We hack by simply clobbering the
919 list of sections in the BFD. This could be handled more
920 cleanly by, say, a new section flag; the existing
921 SEC_NEVER_LOAD flag is not the one we want, because that one
922 still implies that the section takes up space in the output
924 abfd
->sections
= NULL
;
925 abfd
->section_count
= 0;
927 /* If this is the first dynamic object found in the link, create
928 the special sections required for dynamic linking. */
929 if (! elf_hash_table (info
)->dynamic_sections_created
)
931 if (! elf_link_create_dynamic_sections (abfd
, info
))
937 /* Add a DT_NEEDED entry for this dynamic object. */
938 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
939 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
941 if (strindex
== (bfd_size_type
) -1)
944 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
947 Elf_External_Dyn
*dyncon
, *dynconend
;
949 /* The hash table size did not change, which means that
950 the dynamic object name was already entered. If we
951 have already included this dynamic object in the
952 link, just ignore it. There is no reason to include
953 a particular dynamic object more than once. */
954 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
956 BFD_ASSERT (sdyn
!= NULL
);
958 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
959 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
961 for (; dyncon
< dynconend
; dyncon
++)
963 Elf_Internal_Dyn dyn
;
965 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
967 if (dyn
.d_tag
== DT_NEEDED
968 && dyn
.d_un
.d_val
== strindex
)
972 if (extversym
!= NULL
)
979 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
983 /* Save the SONAME, if there is one, because sometimes the
984 linker emulation code will need to know it. */
986 name
= bfd_get_filename (abfd
);
987 elf_dt_name (abfd
) = name
;
991 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
993 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
994 != extsymcount
* sizeof (Elf_External_Sym
)))
999 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1000 esymend
= buf
+ extsymcount
;
1003 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1005 Elf_Internal_Sym sym
;
1011 struct elf_link_hash_entry
*h
;
1013 boolean size_change_ok
, type_change_ok
;
1014 boolean new_weakdef
;
1015 unsigned int old_alignment
;
1017 elf_swap_symbol_in (abfd
, esym
, &sym
);
1019 flags
= BSF_NO_FLAGS
;
1021 value
= sym
.st_value
;
1024 bind
= ELF_ST_BIND (sym
.st_info
);
1025 if (bind
== STB_LOCAL
)
1027 /* This should be impossible, since ELF requires that all
1028 global symbols follow all local symbols, and that sh_info
1029 point to the first global symbol. Unfortunatealy, Irix 5
1033 else if (bind
== STB_GLOBAL
)
1035 if (sym
.st_shndx
!= SHN_UNDEF
1036 && sym
.st_shndx
!= SHN_COMMON
)
1041 else if (bind
== STB_WEAK
)
1045 /* Leave it up to the processor backend. */
1048 if (sym
.st_shndx
== SHN_UNDEF
)
1049 sec
= bfd_und_section_ptr
;
1050 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1052 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1054 sec
= bfd_abs_section_ptr
;
1055 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1058 else if (sym
.st_shndx
== SHN_ABS
)
1059 sec
= bfd_abs_section_ptr
;
1060 else if (sym
.st_shndx
== SHN_COMMON
)
1062 sec
= bfd_com_section_ptr
;
1063 /* What ELF calls the size we call the value. What ELF
1064 calls the value we call the alignment. */
1065 value
= sym
.st_size
;
1069 /* Leave it up to the processor backend. */
1072 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1073 if (name
== (const char *) NULL
)
1076 if (add_symbol_hook
)
1078 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1082 /* The hook function sets the name to NULL if this symbol
1083 should be skipped for some reason. */
1084 if (name
== (const char *) NULL
)
1088 /* Sanity check that all possibilities were handled. */
1089 if (sec
== (asection
*) NULL
)
1091 bfd_set_error (bfd_error_bad_value
);
1095 if (bfd_is_und_section (sec
)
1096 || bfd_is_com_section (sec
))
1101 size_change_ok
= false;
1102 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1104 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1106 Elf_Internal_Versym iver
;
1107 unsigned int vernum
= 0;
1112 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1113 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1115 /* If this is a hidden symbol, or if it is not version
1116 1, we append the version name to the symbol name.
1117 However, we do not modify a non-hidden absolute
1118 symbol, because it might be the version symbol
1119 itself. FIXME: What if it isn't? */
1120 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1121 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1124 int namelen
, newlen
;
1127 if (sym
.st_shndx
!= SHN_UNDEF
)
1129 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1131 (*_bfd_error_handler
)
1132 (_("%s: %s: invalid version %u (max %d)"),
1133 bfd_get_filename (abfd
), name
, vernum
,
1134 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1135 bfd_set_error (bfd_error_bad_value
);
1138 else if (vernum
> 1)
1140 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1146 /* We cannot simply test for the number of
1147 entries in the VERNEED section since the
1148 numbers for the needed versions do not start
1150 Elf_Internal_Verneed
*t
;
1153 for (t
= elf_tdata (abfd
)->verref
;
1157 Elf_Internal_Vernaux
*a
;
1159 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1161 if (a
->vna_other
== vernum
)
1163 verstr
= a
->vna_nodename
;
1172 (*_bfd_error_handler
)
1173 (_("%s: %s: invalid needed version %d"),
1174 bfd_get_filename (abfd
), name
, vernum
);
1175 bfd_set_error (bfd_error_bad_value
);
1180 namelen
= strlen (name
);
1181 newlen
= namelen
+ strlen (verstr
) + 2;
1182 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1185 newname
= (char *) bfd_alloc (abfd
, newlen
);
1186 if (newname
== NULL
)
1188 strcpy (newname
, name
);
1189 p
= newname
+ namelen
;
1191 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1199 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1200 sym_hash
, &override
, &type_change_ok
,
1208 while (h
->root
.type
== bfd_link_hash_indirect
1209 || h
->root
.type
== bfd_link_hash_warning
)
1210 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1212 /* Remember the old alignment if this is a common symbol, so
1213 that we don't reduce the alignment later on. We can't
1214 check later, because _bfd_generic_link_add_one_symbol
1215 will set a default for the alignment which we want to
1217 if (h
->root
.type
== bfd_link_hash_common
)
1218 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1220 if (elf_tdata (abfd
)->verdef
!= NULL
1224 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1227 if (! (_bfd_generic_link_add_one_symbol
1228 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1229 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1233 while (h
->root
.type
== bfd_link_hash_indirect
1234 || h
->root
.type
== bfd_link_hash_warning
)
1235 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1238 new_weakdef
= false;
1241 && (flags
& BSF_WEAK
) != 0
1242 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1243 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1244 && h
->weakdef
== NULL
)
1246 /* Keep a list of all weak defined non function symbols from
1247 a dynamic object, using the weakdef field. Later in this
1248 function we will set the weakdef field to the correct
1249 value. We only put non-function symbols from dynamic
1250 objects on this list, because that happens to be the only
1251 time we need to know the normal symbol corresponding to a
1252 weak symbol, and the information is time consuming to
1253 figure out. If the weakdef field is not already NULL,
1254 then this symbol was already defined by some previous
1255 dynamic object, and we will be using that previous
1256 definition anyhow. */
1263 /* Set the alignment of a common symbol. */
1264 if (sym
.st_shndx
== SHN_COMMON
1265 && h
->root
.type
== bfd_link_hash_common
)
1269 align
= bfd_log2 (sym
.st_value
);
1270 if (align
> old_alignment
)
1271 h
->root
.u
.c
.p
->alignment_power
= align
;
1274 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1280 /* Remember the symbol size and type. */
1281 if (sym
.st_size
!= 0
1282 && (definition
|| h
->size
== 0))
1284 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1285 (*_bfd_error_handler
)
1286 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1287 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1288 bfd_get_filename (abfd
));
1290 h
->size
= sym
.st_size
;
1293 /* If this is a common symbol, then we always want H->SIZE
1294 to be the size of the common symbol. The code just above
1295 won't fix the size if a common symbol becomes larger. We
1296 don't warn about a size change here, because that is
1297 covered by --warn-common. */
1298 if (h
->root
.type
== bfd_link_hash_common
)
1299 h
->size
= h
->root
.u
.c
.size
;
1301 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1302 && (definition
|| h
->type
== STT_NOTYPE
))
1304 if (h
->type
!= STT_NOTYPE
1305 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1306 && ! type_change_ok
)
1307 (*_bfd_error_handler
)
1308 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1309 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1310 bfd_get_filename (abfd
));
1312 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1315 if (sym
.st_other
!= 0
1316 && (definition
|| h
->other
== 0))
1317 h
->other
= sym
.st_other
;
1319 /* Set a flag in the hash table entry indicating the type of
1320 reference or definition we just found. Keep a count of
1321 the number of dynamic symbols we find. A dynamic symbol
1322 is one which is referenced or defined by both a regular
1323 object and a shared object. */
1324 old_flags
= h
->elf_link_hash_flags
;
1330 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1331 if (bind
!= STB_WEAK
)
1332 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1335 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1337 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1338 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1344 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1346 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1347 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1348 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1349 || (h
->weakdef
!= NULL
1351 && h
->weakdef
->dynindx
!= -1))
1355 h
->elf_link_hash_flags
|= new_flag
;
1357 /* If this symbol has a version, and it is the default
1358 version, we create an indirect symbol from the default
1359 name to the fully decorated name. This will cause
1360 external references which do not specify a version to be
1361 bound to this version of the symbol. */
1366 p
= strchr (name
, ELF_VER_CHR
);
1367 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1370 struct elf_link_hash_entry
*hi
;
1373 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1375 if (shortname
== NULL
)
1377 strncpy (shortname
, name
, p
- name
);
1378 shortname
[p
- name
] = '\0';
1380 /* We are going to create a new symbol. Merge it
1381 with any existing symbol with this name. For the
1382 purposes of the merge, act as though we were
1383 defining the symbol we just defined, although we
1384 actually going to define an indirect symbol. */
1385 type_change_ok
= false;
1386 size_change_ok
= false;
1387 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1388 &value
, &hi
, &override
,
1389 &type_change_ok
, &size_change_ok
))
1394 if (! (_bfd_generic_link_add_one_symbol
1395 (info
, abfd
, shortname
, BSF_INDIRECT
,
1396 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1397 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1402 /* In this case the symbol named SHORTNAME is
1403 overriding the indirect symbol we want to
1404 add. We were planning on making SHORTNAME an
1405 indirect symbol referring to NAME. SHORTNAME
1406 is the name without a version. NAME is the
1407 fully versioned name, and it is the default
1410 Overriding means that we already saw a
1411 definition for the symbol SHORTNAME in a
1412 regular object, and it is overriding the
1413 symbol defined in the dynamic object.
1415 When this happens, we actually want to change
1416 NAME, the symbol we just added, to refer to
1417 SHORTNAME. This will cause references to
1418 NAME in the shared object to become
1419 references to SHORTNAME in the regular
1420 object. This is what we expect when we
1421 override a function in a shared object: that
1422 the references in the shared object will be
1423 mapped to the definition in the regular
1426 while (hi
->root
.type
== bfd_link_hash_indirect
1427 || hi
->root
.type
== bfd_link_hash_warning
)
1428 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1430 h
->root
.type
= bfd_link_hash_indirect
;
1431 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1432 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1434 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1435 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1436 if (hi
->elf_link_hash_flags
1437 & (ELF_LINK_HASH_REF_REGULAR
1438 | ELF_LINK_HASH_DEF_REGULAR
))
1440 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1446 /* Now set HI to H, so that the following code
1447 will set the other fields correctly. */
1451 /* If there is a duplicate definition somewhere,
1452 then HI may not point to an indirect symbol. We
1453 will have reported an error to the user in that
1456 if (hi
->root
.type
== bfd_link_hash_indirect
)
1458 struct elf_link_hash_entry
*ht
;
1460 /* If the symbol became indirect, then we assume
1461 that we have not seen a definition before. */
1462 BFD_ASSERT ((hi
->elf_link_hash_flags
1463 & (ELF_LINK_HASH_DEF_DYNAMIC
1464 | ELF_LINK_HASH_DEF_REGULAR
))
1467 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1469 /* Copy down any references that we may have
1470 already seen to the symbol which just became
1472 ht
->elf_link_hash_flags
|=
1473 (hi
->elf_link_hash_flags
1474 & (ELF_LINK_HASH_REF_DYNAMIC
1475 | ELF_LINK_HASH_REF_REGULAR
1476 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1478 /* Copy over the global and procedure linkage table
1479 offset entries. These may have been already set
1480 up by a check_relocs routine. */
1481 if (ht
->got
.offset
== (bfd_vma
) -1)
1483 ht
->got
.offset
= hi
->got
.offset
;
1484 hi
->got
.offset
= (bfd_vma
) -1;
1486 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1488 if (ht
->plt
.offset
== (bfd_vma
) -1)
1490 ht
->plt
.offset
= hi
->plt
.offset
;
1491 hi
->plt
.offset
= (bfd_vma
) -1;
1493 BFD_ASSERT (hi
->plt
.offset
== (bfd_vma
) -1);
1495 if (ht
->dynindx
== -1)
1497 ht
->dynindx
= hi
->dynindx
;
1498 ht
->dynstr_index
= hi
->dynstr_index
;
1500 hi
->dynstr_index
= 0;
1502 BFD_ASSERT (hi
->dynindx
== -1);
1504 /* FIXME: There may be other information to copy
1505 over for particular targets. */
1507 /* See if the new flags lead us to realize that
1508 the symbol must be dynamic. */
1514 || ((hi
->elf_link_hash_flags
1515 & ELF_LINK_HASH_REF_DYNAMIC
)
1521 if ((hi
->elf_link_hash_flags
1522 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1528 /* We also need to define an indirection from the
1529 nondefault version of the symbol. */
1531 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1533 if (shortname
== NULL
)
1535 strncpy (shortname
, name
, p
- name
);
1536 strcpy (shortname
+ (p
- name
), p
+ 1);
1538 /* Once again, merge with any existing symbol. */
1539 type_change_ok
= false;
1540 size_change_ok
= false;
1541 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1542 &value
, &hi
, &override
,
1543 &type_change_ok
, &size_change_ok
))
1548 /* Here SHORTNAME is a versioned name, so we
1549 don't expect to see the type of override we
1550 do in the case above. */
1551 (*_bfd_error_handler
)
1552 (_("%s: warning: unexpected redefinition of `%s'"),
1553 bfd_get_filename (abfd
), shortname
);
1557 if (! (_bfd_generic_link_add_one_symbol
1558 (info
, abfd
, shortname
, BSF_INDIRECT
,
1559 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1560 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1563 /* If there is a duplicate definition somewhere,
1564 then HI may not point to an indirect symbol.
1565 We will have reported an error to the user in
1568 if (hi
->root
.type
== bfd_link_hash_indirect
)
1570 /* If the symbol became indirect, then we
1571 assume that we have not seen a definition
1573 BFD_ASSERT ((hi
->elf_link_hash_flags
1574 & (ELF_LINK_HASH_DEF_DYNAMIC
1575 | ELF_LINK_HASH_DEF_REGULAR
))
1578 /* Copy down any references that we may have
1579 already seen to the symbol which just
1581 h
->elf_link_hash_flags
|=
1582 (hi
->elf_link_hash_flags
1583 & (ELF_LINK_HASH_REF_DYNAMIC
1584 | ELF_LINK_HASH_REF_REGULAR
1585 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1587 /* Copy over the global and procedure linkage
1588 table offset entries. These may have been
1589 already set up by a check_relocs routine. */
1590 if (h
->got
.offset
== (bfd_vma
) -1)
1592 h
->got
.offset
= hi
->got
.offset
;
1593 hi
->got
.offset
= (bfd_vma
) -1;
1595 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1597 if (h
->plt
.offset
== (bfd_vma
) -1)
1599 h
->plt
.offset
= hi
->plt
.offset
;
1600 hi
->plt
.offset
= (bfd_vma
) -1;
1602 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1604 if (h
->dynindx
== -1)
1606 h
->dynindx
= hi
->dynindx
;
1607 h
->dynstr_index
= hi
->dynstr_index
;
1609 hi
->dynstr_index
= 0;
1611 BFD_ASSERT (hi
->dynindx
== -1);
1613 /* FIXME: There may be other information to
1614 copy over for particular targets. */
1616 /* See if the new flags lead us to realize
1617 that the symbol must be dynamic. */
1623 || ((hi
->elf_link_hash_flags
1624 & ELF_LINK_HASH_REF_DYNAMIC
)
1630 if ((hi
->elf_link_hash_flags
1631 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1640 if (dynsym
&& h
->dynindx
== -1)
1642 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1644 if (h
->weakdef
!= NULL
1646 && h
->weakdef
->dynindx
== -1)
1648 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1656 /* Now set the weakdefs field correctly for all the weak defined
1657 symbols we found. The only way to do this is to search all the
1658 symbols. Since we only need the information for non functions in
1659 dynamic objects, that's the only time we actually put anything on
1660 the list WEAKS. We need this information so that if a regular
1661 object refers to a symbol defined weakly in a dynamic object, the
1662 real symbol in the dynamic object is also put in the dynamic
1663 symbols; we also must arrange for both symbols to point to the
1664 same memory location. We could handle the general case of symbol
1665 aliasing, but a general symbol alias can only be generated in
1666 assembler code, handling it correctly would be very time
1667 consuming, and other ELF linkers don't handle general aliasing
1669 while (weaks
!= NULL
)
1671 struct elf_link_hash_entry
*hlook
;
1674 struct elf_link_hash_entry
**hpp
;
1675 struct elf_link_hash_entry
**hppend
;
1678 weaks
= hlook
->weakdef
;
1679 hlook
->weakdef
= NULL
;
1681 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1682 || hlook
->root
.type
== bfd_link_hash_defweak
1683 || hlook
->root
.type
== bfd_link_hash_common
1684 || hlook
->root
.type
== bfd_link_hash_indirect
);
1685 slook
= hlook
->root
.u
.def
.section
;
1686 vlook
= hlook
->root
.u
.def
.value
;
1688 hpp
= elf_sym_hashes (abfd
);
1689 hppend
= hpp
+ extsymcount
;
1690 for (; hpp
< hppend
; hpp
++)
1692 struct elf_link_hash_entry
*h
;
1695 if (h
!= NULL
&& h
!= hlook
1696 && h
->root
.type
== bfd_link_hash_defined
1697 && h
->root
.u
.def
.section
== slook
1698 && h
->root
.u
.def
.value
== vlook
)
1702 /* If the weak definition is in the list of dynamic
1703 symbols, make sure the real definition is put there
1705 if (hlook
->dynindx
!= -1
1706 && h
->dynindx
== -1)
1708 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1712 /* If the real definition is in the list of dynamic
1713 symbols, make sure the weak definition is put there
1714 as well. If we don't do this, then the dynamic
1715 loader might not merge the entries for the real
1716 definition and the weak definition. */
1717 if (h
->dynindx
!= -1
1718 && hlook
->dynindx
== -1)
1720 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1735 if (extversym
!= NULL
)
1741 /* If this object is the same format as the output object, and it is
1742 not a shared library, then let the backend look through the
1745 This is required to build global offset table entries and to
1746 arrange for dynamic relocs. It is not required for the
1747 particular common case of linking non PIC code, even when linking
1748 against shared libraries, but unfortunately there is no way of
1749 knowing whether an object file has been compiled PIC or not.
1750 Looking through the relocs is not particularly time consuming.
1751 The problem is that we must either (1) keep the relocs in memory,
1752 which causes the linker to require additional runtime memory or
1753 (2) read the relocs twice from the input file, which wastes time.
1754 This would be a good case for using mmap.
1756 I have no idea how to handle linking PIC code into a file of a
1757 different format. It probably can't be done. */
1758 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1760 && abfd
->xvec
== info
->hash
->creator
1761 && check_relocs
!= NULL
)
1765 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1767 Elf_Internal_Rela
*internal_relocs
;
1770 if ((o
->flags
& SEC_RELOC
) == 0
1771 || o
->reloc_count
== 0
1772 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1773 && (o
->flags
& SEC_DEBUGGING
) != 0)
1774 || bfd_is_abs_section (o
->output_section
))
1777 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1778 (abfd
, o
, (PTR
) NULL
,
1779 (Elf_Internal_Rela
*) NULL
,
1780 info
->keep_memory
));
1781 if (internal_relocs
== NULL
)
1784 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1786 if (! info
->keep_memory
)
1787 free (internal_relocs
);
1794 /* If this is a non-traditional, non-relocateable link, try to
1795 optimize the handling of the .stab/.stabstr sections. */
1797 && ! info
->relocateable
1798 && ! info
->traditional_format
1799 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1800 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1802 asection
*stab
, *stabstr
;
1804 stab
= bfd_get_section_by_name (abfd
, ".stab");
1807 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1809 if (stabstr
!= NULL
)
1811 struct bfd_elf_section_data
*secdata
;
1813 secdata
= elf_section_data (stab
);
1814 if (! _bfd_link_section_stabs (abfd
,
1815 &elf_hash_table (info
)->stab_info
,
1817 &secdata
->stab_info
))
1832 if (extversym
!= NULL
)
1837 /* Create some sections which will be filled in with dynamic linking
1838 information. ABFD is an input file which requires dynamic sections
1839 to be created. The dynamic sections take up virtual memory space
1840 when the final executable is run, so we need to create them before
1841 addresses are assigned to the output sections. We work out the
1842 actual contents and size of these sections later. */
1845 elf_link_create_dynamic_sections (abfd
, info
)
1847 struct bfd_link_info
*info
;
1850 register asection
*s
;
1851 struct elf_link_hash_entry
*h
;
1852 struct elf_backend_data
*bed
;
1854 if (elf_hash_table (info
)->dynamic_sections_created
)
1857 /* Make sure that all dynamic sections use the same input BFD. */
1858 if (elf_hash_table (info
)->dynobj
== NULL
)
1859 elf_hash_table (info
)->dynobj
= abfd
;
1861 abfd
= elf_hash_table (info
)->dynobj
;
1863 /* Note that we set the SEC_IN_MEMORY flag for all of these
1865 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1866 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1868 /* A dynamically linked executable has a .interp section, but a
1869 shared library does not. */
1872 s
= bfd_make_section (abfd
, ".interp");
1874 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1878 /* Create sections to hold version informations. These are removed
1879 if they are not needed. */
1880 s
= bfd_make_section (abfd
, ".gnu.version_d");
1882 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1883 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1886 s
= bfd_make_section (abfd
, ".gnu.version");
1888 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1889 || ! bfd_set_section_alignment (abfd
, s
, 1))
1892 s
= bfd_make_section (abfd
, ".gnu.version_r");
1894 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1895 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1898 s
= bfd_make_section (abfd
, ".dynsym");
1900 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1901 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1904 s
= bfd_make_section (abfd
, ".dynstr");
1906 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1909 /* Create a strtab to hold the dynamic symbol names. */
1910 if (elf_hash_table (info
)->dynstr
== NULL
)
1912 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1913 if (elf_hash_table (info
)->dynstr
== NULL
)
1917 s
= bfd_make_section (abfd
, ".dynamic");
1919 || ! bfd_set_section_flags (abfd
, s
, flags
)
1920 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1923 /* The special symbol _DYNAMIC is always set to the start of the
1924 .dynamic section. This call occurs before we have processed the
1925 symbols for any dynamic object, so we don't have to worry about
1926 overriding a dynamic definition. We could set _DYNAMIC in a
1927 linker script, but we only want to define it if we are, in fact,
1928 creating a .dynamic section. We don't want to define it if there
1929 is no .dynamic section, since on some ELF platforms the start up
1930 code examines it to decide how to initialize the process. */
1932 if (! (_bfd_generic_link_add_one_symbol
1933 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1934 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1935 (struct bfd_link_hash_entry
**) &h
)))
1937 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1938 h
->type
= STT_OBJECT
;
1941 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1944 s
= bfd_make_section (abfd
, ".hash");
1946 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1947 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1950 /* Let the backend create the rest of the sections. This lets the
1951 backend set the right flags. The backend will normally create
1952 the .got and .plt sections. */
1953 bed
= get_elf_backend_data (abfd
);
1954 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1957 elf_hash_table (info
)->dynamic_sections_created
= true;
1962 /* Add an entry to the .dynamic table. */
1965 elf_add_dynamic_entry (info
, tag
, val
)
1966 struct bfd_link_info
*info
;
1970 Elf_Internal_Dyn dyn
;
1974 bfd_byte
*newcontents
;
1976 dynobj
= elf_hash_table (info
)->dynobj
;
1978 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1979 BFD_ASSERT (s
!= NULL
);
1981 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1982 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1983 if (newcontents
== NULL
)
1987 dyn
.d_un
.d_val
= val
;
1988 elf_swap_dyn_out (dynobj
, &dyn
,
1989 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1991 s
->_raw_size
= newsize
;
1992 s
->contents
= newcontents
;
1998 /* Read and swap the relocs from the section indicated by SHDR. This
1999 may be either a REL or a RELA section. The relocations are
2000 translated into RELA relocations and stored in INTERNAL_RELOCS,
2001 which should have already been allocated to contain enough space.
2002 The EXTERNAL_RELOCS are a buffer where the external form of the
2003 relocations should be stored.
2005 Returns false if something goes wrong. */
2008 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2011 Elf_Internal_Shdr
*shdr
;
2012 PTR external_relocs
;
2013 Elf_Internal_Rela
*internal_relocs
;
2015 /* If there aren't any relocations, that's OK. */
2019 /* Position ourselves at the start of the section. */
2020 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2023 /* Read the relocations. */
2024 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2028 /* Convert the external relocations to the internal format. */
2029 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2031 Elf_External_Rel
*erel
;
2032 Elf_External_Rel
*erelend
;
2033 Elf_Internal_Rela
*irela
;
2035 erel
= (Elf_External_Rel
*) external_relocs
;
2036 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2037 irela
= internal_relocs
;
2038 for (; erel
< erelend
; erel
++, irela
++)
2040 Elf_Internal_Rel irel
;
2042 elf_swap_reloc_in (abfd
, erel
, &irel
);
2043 irela
->r_offset
= irel
.r_offset
;
2044 irela
->r_info
= irel
.r_info
;
2045 irela
->r_addend
= 0;
2050 Elf_External_Rela
*erela
;
2051 Elf_External_Rela
*erelaend
;
2052 Elf_Internal_Rela
*irela
;
2054 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2056 erela
= (Elf_External_Rela
*) external_relocs
;
2057 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2058 irela
= internal_relocs
;
2059 for (; erela
< erelaend
; erela
++, irela
++)
2060 elf_swap_reloca_in (abfd
, erela
, irela
);
2066 /* Read and swap the relocs for a section. They may have been cached.
2067 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
2068 they are used as buffers to read into. They are known to be large
2069 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
2070 value is allocated using either malloc or bfd_alloc, according to
2071 the KEEP_MEMORY argument. */
2074 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2078 PTR external_relocs
;
2079 Elf_Internal_Rela
*internal_relocs
;
2080 boolean keep_memory
;
2082 Elf_Internal_Shdr
*rel_hdr
;
2084 Elf_Internal_Rela
*alloc2
= NULL
;
2086 if (elf_section_data (o
)->relocs
!= NULL
)
2087 return elf_section_data (o
)->relocs
;
2089 if (o
->reloc_count
== 0)
2092 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2094 if (internal_relocs
== NULL
)
2098 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2100 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2102 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2103 if (internal_relocs
== NULL
)
2107 if (external_relocs
== NULL
)
2109 size_t size
= (size_t) rel_hdr
->sh_size
;
2111 if (elf_section_data (o
)->rel_hdr2
)
2112 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2113 alloc1
= (PTR
) bfd_malloc (size
);
2116 external_relocs
= alloc1
;
2119 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2123 if (!elf_link_read_relocs_from_section
2125 elf_section_data (o
)->rel_hdr2
,
2126 external_relocs
+ rel_hdr
->sh_size
,
2127 internal_relocs
+ rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
))
2130 /* Cache the results for next time, if we can. */
2132 elf_section_data (o
)->relocs
= internal_relocs
;
2137 /* Don't free alloc2, since if it was allocated we are passing it
2138 back (under the name of internal_relocs). */
2140 return internal_relocs
;
2151 /* Record an assignment to a symbol made by a linker script. We need
2152 this in case some dynamic object refers to this symbol. */
2156 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2158 struct bfd_link_info
*info
;
2162 struct elf_link_hash_entry
*h
;
2164 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2167 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2171 if (h
->root
.type
== bfd_link_hash_new
)
2172 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2174 /* If this symbol is being provided by the linker script, and it is
2175 currently defined by a dynamic object, but not by a regular
2176 object, then mark it as undefined so that the generic linker will
2177 force the correct value. */
2179 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2180 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2181 h
->root
.type
= bfd_link_hash_undefined
;
2183 /* If this symbol is not being provided by the linker script, and it is
2184 currently defined by a dynamic object, but not by a regular object,
2185 then clear out any version information because the symbol will not be
2186 associated with the dynamic object any more. */
2188 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2189 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2190 h
->verinfo
.verdef
= NULL
;
2192 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2193 h
->type
= STT_OBJECT
;
2195 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2196 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2198 && h
->dynindx
== -1)
2200 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2203 /* If this is a weak defined symbol, and we know a corresponding
2204 real symbol from the same dynamic object, make sure the real
2205 symbol is also made into a dynamic symbol. */
2206 if (h
->weakdef
!= NULL
2207 && h
->weakdef
->dynindx
== -1)
2209 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2217 /* This structure is used to pass information to
2218 elf_link_assign_sym_version. */
2220 struct elf_assign_sym_version_info
2224 /* General link information. */
2225 struct bfd_link_info
*info
;
2227 struct bfd_elf_version_tree
*verdefs
;
2228 /* Whether we are exporting all dynamic symbols. */
2229 boolean export_dynamic
;
2230 /* Whether we removed any symbols from the dynamic symbol table. */
2231 boolean removed_dynamic
;
2232 /* Whether we had a failure. */
2236 /* This structure is used to pass information to
2237 elf_link_find_version_dependencies. */
2239 struct elf_find_verdep_info
2243 /* General link information. */
2244 struct bfd_link_info
*info
;
2245 /* The number of dependencies. */
2247 /* Whether we had a failure. */
2251 /* Array used to determine the number of hash table buckets to use
2252 based on the number of symbols there are. If there are fewer than
2253 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2254 fewer than 37 we use 17 buckets, and so forth. We never use more
2255 than 32771 buckets. */
2257 static const size_t elf_buckets
[] =
2259 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2263 /* Compute bucket count for hashing table. We do not use a static set
2264 of possible tables sizes anymore. Instead we determine for all
2265 possible reasonable sizes of the table the outcome (i.e., the
2266 number of collisions etc) and choose the best solution. The
2267 weighting functions are not too simple to allow the table to grow
2268 without bounds. Instead one of the weighting factors is the size.
2269 Therefore the result is always a good payoff between few collisions
2270 (= short chain lengths) and table size. */
2272 compute_bucket_count (info
)
2273 struct bfd_link_info
*info
;
2275 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2277 unsigned long int *hashcodes
;
2278 unsigned long int *hashcodesp
;
2279 unsigned long int i
;
2281 /* Compute the hash values for all exported symbols. At the same
2282 time store the values in an array so that we could use them for
2284 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2285 * sizeof (unsigned long int));
2286 if (hashcodes
== NULL
)
2288 hashcodesp
= hashcodes
;
2290 /* Put all hash values in HASHCODES. */
2291 elf_link_hash_traverse (elf_hash_table (info
),
2292 elf_collect_hash_codes
, &hashcodesp
);
2294 /* We have a problem here. The following code to optimize the table
2295 size requires an integer type with more the 32 bits. If
2296 BFD_HOST_U_64_BIT is set we know about such a type. */
2297 #ifdef BFD_HOST_U_64_BIT
2298 if (info
->optimize
== true)
2300 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2303 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2304 unsigned long int *counts
;
2306 /* Possible optimization parameters: if we have NSYMS symbols we say
2307 that the hashing table must at least have NSYMS/4 and at most
2309 minsize
= nsyms
/ 4;
2312 best_size
= maxsize
= nsyms
* 2;
2314 /* Create array where we count the collisions in. We must use bfd_malloc
2315 since the size could be large. */
2316 counts
= (unsigned long int *) bfd_malloc (maxsize
2317 * sizeof (unsigned long int));
2324 /* Compute the "optimal" size for the hash table. The criteria is a
2325 minimal chain length. The minor criteria is (of course) the size
2327 for (i
= minsize
; i
< maxsize
; ++i
)
2329 /* Walk through the array of hashcodes and count the collisions. */
2330 BFD_HOST_U_64_BIT max
;
2331 unsigned long int j
;
2332 unsigned long int fact
;
2334 memset (counts
, '\0', i
* sizeof (unsigned long int));
2336 /* Determine how often each hash bucket is used. */
2337 for (j
= 0; j
< nsyms
; ++j
)
2338 ++counts
[hashcodes
[j
] % i
];
2340 /* For the weight function we need some information about the
2341 pagesize on the target. This is information need not be 100%
2342 accurate. Since this information is not available (so far) we
2343 define it here to a reasonable default value. If it is crucial
2344 to have a better value some day simply define this value. */
2345 # ifndef BFD_TARGET_PAGESIZE
2346 # define BFD_TARGET_PAGESIZE (4096)
2349 /* We in any case need 2 + NSYMS entries for the size values and
2351 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2354 /* Variant 1: optimize for short chains. We add the squares
2355 of all the chain lengths (which favous many small chain
2356 over a few long chains). */
2357 for (j
= 0; j
< i
; ++j
)
2358 max
+= counts
[j
] * counts
[j
];
2360 /* This adds penalties for the overall size of the table. */
2361 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2364 /* Variant 2: Optimize a lot more for small table. Here we
2365 also add squares of the size but we also add penalties for
2366 empty slots (the +1 term). */
2367 for (j
= 0; j
< i
; ++j
)
2368 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2370 /* The overall size of the table is considered, but not as
2371 strong as in variant 1, where it is squared. */
2372 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2376 /* Compare with current best results. */
2377 if (max
< best_chlen
)
2387 #endif /* defined (BFD_HOST_U_64_BIT) */
2389 /* This is the fallback solution if no 64bit type is available or if we
2390 are not supposed to spend much time on optimizations. We select the
2391 bucket count using a fixed set of numbers. */
2392 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2394 best_size
= elf_buckets
[i
];
2395 if (dynsymcount
< elf_buckets
[i
+ 1])
2400 /* Free the arrays we needed. */
2406 /* Remove SECTION from the BFD. If a symbol for SECTION was going to
2407 be put into the dynamic symbol table, remove it, and renumber
2408 subsequent entries. */
2411 elf_link_remove_section_and_adjust_dynindices (info
, section
)
2412 struct bfd_link_info
*info
;
2417 /* Remove the section from the output list. */
2418 _bfd_strip_section_from_output (section
);
2420 if (elf_section_data (section
->output_section
)->dynindx
)
2425 /* We were going to output an entry in the dynamic symbol table
2426 for the symbol corresponding to this section. Now, the
2427 section is gone. So, we must renumber the dynamic indices of
2428 all subsequent sections and all other entries in the dynamic
2430 elf_section_data (section
->output_section
)->dynindx
= 0;
2431 for (s
= section
->output_section
->next
; s
; s
= s
->next
)
2432 if (elf_section_data (s
)->dynindx
)
2433 --elf_section_data (s
)->dynindx
;
2435 elf_link_hash_traverse (elf_hash_table (info
),
2436 _bfd_elf_link_adjust_dynindx
,
2439 /* There is one less dynamic symbol than there was before. */
2440 --elf_hash_table (info
)->dynsymcount
;
2444 /* Set up the sizes and contents of the ELF dynamic sections. This is
2445 called by the ELF linker emulation before_allocation routine. We
2446 must set the sizes of the sections before the linker sets the
2447 addresses of the various sections. */
2450 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2451 export_dynamic
, filter_shlib
,
2452 auxiliary_filters
, info
, sinterpptr
,
2457 boolean export_dynamic
;
2458 const char *filter_shlib
;
2459 const char * const *auxiliary_filters
;
2460 struct bfd_link_info
*info
;
2461 asection
**sinterpptr
;
2462 struct bfd_elf_version_tree
*verdefs
;
2464 bfd_size_type soname_indx
;
2466 struct elf_backend_data
*bed
;
2467 bfd_size_type old_dynsymcount
;
2468 struct elf_assign_sym_version_info asvinfo
;
2472 soname_indx
= (bfd_size_type
) -1;
2474 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2477 /* The backend may have to create some sections regardless of whether
2478 we're dynamic or not. */
2479 bed
= get_elf_backend_data (output_bfd
);
2480 if (bed
->elf_backend_always_size_sections
2481 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2484 dynobj
= elf_hash_table (info
)->dynobj
;
2486 /* If there were no dynamic objects in the link, there is nothing to
2491 /* If we are supposed to export all symbols into the dynamic symbol
2492 table (this is not the normal case), then do so. */
2495 struct elf_info_failed eif
;
2499 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2505 if (elf_hash_table (info
)->dynamic_sections_created
)
2507 struct elf_info_failed eif
;
2508 struct elf_link_hash_entry
*h
;
2509 bfd_size_type strsize
;
2511 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2512 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2516 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2517 soname
, true, true);
2518 if (soname_indx
== (bfd_size_type
) -1
2519 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2525 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2533 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2535 if (indx
== (bfd_size_type
) -1
2536 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2540 if (filter_shlib
!= NULL
)
2544 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2545 filter_shlib
, true, true);
2546 if (indx
== (bfd_size_type
) -1
2547 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2551 if (auxiliary_filters
!= NULL
)
2553 const char * const *p
;
2555 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2559 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2561 if (indx
== (bfd_size_type
) -1
2562 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2567 /* Attach all the symbols to their version information. */
2568 asvinfo
.output_bfd
= output_bfd
;
2569 asvinfo
.info
= info
;
2570 asvinfo
.verdefs
= verdefs
;
2571 asvinfo
.export_dynamic
= export_dynamic
;
2572 asvinfo
.removed_dynamic
= false;
2573 asvinfo
.failed
= false;
2575 elf_link_hash_traverse (elf_hash_table (info
),
2576 elf_link_assign_sym_version
,
2581 /* Find all symbols which were defined in a dynamic object and make
2582 the backend pick a reasonable value for them. */
2585 elf_link_hash_traverse (elf_hash_table (info
),
2586 elf_adjust_dynamic_symbol
,
2591 /* Add some entries to the .dynamic section. We fill in some of the
2592 values later, in elf_bfd_final_link, but we must add the entries
2593 now so that we know the final size of the .dynamic section. */
2594 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2597 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2598 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2600 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2603 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2606 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2607 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2609 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2612 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2613 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2614 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2615 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2616 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2617 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2618 sizeof (Elf_External_Sym
)))
2622 /* The backend must work out the sizes of all the other dynamic
2624 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2625 if (bed
->elf_backend_size_dynamic_sections
2626 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2629 if (elf_hash_table (info
)->dynamic_sections_created
)
2633 size_t bucketcount
= 0;
2634 Elf_Internal_Sym isym
;
2636 /* Set up the version definition section. */
2637 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2638 BFD_ASSERT (s
!= NULL
);
2640 /* We may have created additional version definitions if we are
2641 just linking a regular application. */
2642 verdefs
= asvinfo
.verdefs
;
2644 if (verdefs
== NULL
)
2645 elf_link_remove_section_and_adjust_dynindices (info
, s
);
2650 struct bfd_elf_version_tree
*t
;
2652 Elf_Internal_Verdef def
;
2653 Elf_Internal_Verdaux defaux
;
2655 if (asvinfo
.removed_dynamic
)
2657 /* Some dynamic symbols were changed to be local
2658 symbols. In this case, we renumber all of the
2659 dynamic symbols, so that we don't have a hole. If
2660 the backend changed dynsymcount, then assume that the
2661 new symbols are at the start. This is the case on
2662 the MIPS. FIXME: The names of the removed symbols
2663 will still be in the dynamic string table, wasting
2665 elf_hash_table (info
)->dynsymcount
=
2666 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2667 elf_link_hash_traverse (elf_hash_table (info
),
2668 elf_link_renumber_dynsyms
,
2675 /* Make space for the base version. */
2676 size
+= sizeof (Elf_External_Verdef
);
2677 size
+= sizeof (Elf_External_Verdaux
);
2680 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2682 struct bfd_elf_version_deps
*n
;
2684 size
+= sizeof (Elf_External_Verdef
);
2685 size
+= sizeof (Elf_External_Verdaux
);
2688 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2689 size
+= sizeof (Elf_External_Verdaux
);
2692 s
->_raw_size
= size
;
2693 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2694 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2697 /* Fill in the version definition section. */
2701 def
.vd_version
= VER_DEF_CURRENT
;
2702 def
.vd_flags
= VER_FLG_BASE
;
2705 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2706 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2707 + sizeof (Elf_External_Verdaux
));
2709 if (soname_indx
!= (bfd_size_type
) -1)
2711 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2712 defaux
.vda_name
= soname_indx
;
2719 name
= output_bfd
->filename
;
2720 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2721 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2723 if (indx
== (bfd_size_type
) -1)
2725 defaux
.vda_name
= indx
;
2727 defaux
.vda_next
= 0;
2729 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2730 (Elf_External_Verdef
*)p
);
2731 p
+= sizeof (Elf_External_Verdef
);
2732 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2733 (Elf_External_Verdaux
*) p
);
2734 p
+= sizeof (Elf_External_Verdaux
);
2736 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2739 struct bfd_elf_version_deps
*n
;
2740 struct elf_link_hash_entry
*h
;
2743 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2746 /* Add a symbol representing this version. */
2748 if (! (_bfd_generic_link_add_one_symbol
2749 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2750 (bfd_vma
) 0, (const char *) NULL
, false,
2751 get_elf_backend_data (dynobj
)->collect
,
2752 (struct bfd_link_hash_entry
**) &h
)))
2754 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2755 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2756 h
->type
= STT_OBJECT
;
2757 h
->verinfo
.vertree
= t
;
2759 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2762 def
.vd_version
= VER_DEF_CURRENT
;
2764 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2765 def
.vd_flags
|= VER_FLG_WEAK
;
2766 def
.vd_ndx
= t
->vernum
+ 1;
2767 def
.vd_cnt
= cdeps
+ 1;
2768 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2769 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2770 if (t
->next
!= NULL
)
2771 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2772 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2776 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2777 (Elf_External_Verdef
*) p
);
2778 p
+= sizeof (Elf_External_Verdef
);
2780 defaux
.vda_name
= h
->dynstr_index
;
2781 if (t
->deps
== NULL
)
2782 defaux
.vda_next
= 0;
2784 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2785 t
->name_indx
= defaux
.vda_name
;
2787 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2788 (Elf_External_Verdaux
*) p
);
2789 p
+= sizeof (Elf_External_Verdaux
);
2791 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2793 if (n
->version_needed
== NULL
)
2795 /* This can happen if there was an error in the
2797 defaux
.vda_name
= 0;
2800 defaux
.vda_name
= n
->version_needed
->name_indx
;
2801 if (n
->next
== NULL
)
2802 defaux
.vda_next
= 0;
2804 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2806 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2807 (Elf_External_Verdaux
*) p
);
2808 p
+= sizeof (Elf_External_Verdaux
);
2812 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2813 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2816 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2819 /* Work out the size of the version reference section. */
2821 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2822 BFD_ASSERT (s
!= NULL
);
2824 struct elf_find_verdep_info sinfo
;
2826 sinfo
.output_bfd
= output_bfd
;
2828 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2829 if (sinfo
.vers
== 0)
2831 sinfo
.failed
= false;
2833 elf_link_hash_traverse (elf_hash_table (info
),
2834 elf_link_find_version_dependencies
,
2837 if (elf_tdata (output_bfd
)->verref
== NULL
)
2838 elf_link_remove_section_and_adjust_dynindices (info
, s
);
2841 Elf_Internal_Verneed
*t
;
2846 /* Build the version definition section. */
2849 for (t
= elf_tdata (output_bfd
)->verref
;
2853 Elf_Internal_Vernaux
*a
;
2855 size
+= sizeof (Elf_External_Verneed
);
2857 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2858 size
+= sizeof (Elf_External_Vernaux
);
2861 s
->_raw_size
= size
;
2862 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2863 if (s
->contents
== NULL
)
2867 for (t
= elf_tdata (output_bfd
)->verref
;
2872 Elf_Internal_Vernaux
*a
;
2876 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2879 t
->vn_version
= VER_NEED_CURRENT
;
2881 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2882 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2883 elf_dt_name (t
->vn_bfd
),
2886 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2887 t
->vn_bfd
->filename
, true, false);
2888 if (indx
== (bfd_size_type
) -1)
2891 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2892 if (t
->vn_nextref
== NULL
)
2895 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2896 + caux
* sizeof (Elf_External_Vernaux
));
2898 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2899 (Elf_External_Verneed
*) p
);
2900 p
+= sizeof (Elf_External_Verneed
);
2902 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2904 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2906 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2907 a
->vna_nodename
, true, false);
2908 if (indx
== (bfd_size_type
) -1)
2911 if (a
->vna_nextptr
== NULL
)
2914 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2916 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2917 (Elf_External_Vernaux
*) p
);
2918 p
+= sizeof (Elf_External_Vernaux
);
2922 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2923 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2926 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2930 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2932 /* Work out the size of the symbol version section. */
2933 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2934 BFD_ASSERT (s
!= NULL
);
2935 if (dynsymcount
== 0
2936 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2938 elf_link_remove_section_and_adjust_dynindices (info
, s
);
2939 /* The DYNSYMCOUNT might have changed if we were going to
2940 output a dynamic symbol table entry for S. */
2941 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2945 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2946 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2947 if (s
->contents
== NULL
)
2950 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2954 /* Set the size of the .dynsym and .hash sections. We counted
2955 the number of dynamic symbols in elf_link_add_object_symbols.
2956 We will build the contents of .dynsym and .hash when we build
2957 the final symbol table, because until then we do not know the
2958 correct value to give the symbols. We built the .dynstr
2959 section as we went along in elf_link_add_object_symbols. */
2960 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2961 BFD_ASSERT (s
!= NULL
);
2962 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2963 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2964 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2967 /* The first entry in .dynsym is a dummy symbol. */
2974 elf_swap_symbol_out (output_bfd
, &isym
,
2975 (PTR
) (Elf_External_Sym
*) s
->contents
);
2977 /* Compute the size of the hashing table. As a side effect this
2978 computes the hash values for all the names we export. */
2979 bucketcount
= compute_bucket_count (info
);
2981 s
= bfd_get_section_by_name (dynobj
, ".hash");
2982 BFD_ASSERT (s
!= NULL
);
2983 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2984 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2985 if (s
->contents
== NULL
)
2987 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2989 put_word (output_bfd
, bucketcount
, s
->contents
);
2990 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2992 elf_hash_table (info
)->bucketcount
= bucketcount
;
2994 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2995 BFD_ASSERT (s
!= NULL
);
2996 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2998 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3005 /* Fix up the flags for a symbol. This handles various cases which
3006 can only be fixed after all the input files are seen. This is
3007 currently called by both adjust_dynamic_symbol and
3008 assign_sym_version, which is unnecessary but perhaps more robust in
3009 the face of future changes. */
3012 elf_fix_symbol_flags (h
, eif
)
3013 struct elf_link_hash_entry
*h
;
3014 struct elf_info_failed
*eif
;
3016 /* If this symbol was mentioned in a non-ELF file, try to set
3017 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3018 permit a non-ELF file to correctly refer to a symbol defined in
3019 an ELF dynamic object. */
3020 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3022 if (h
->root
.type
!= bfd_link_hash_defined
3023 && h
->root
.type
!= bfd_link_hash_defweak
)
3024 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3025 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3028 if (h
->root
.u
.def
.section
->owner
!= NULL
3029 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3030 == bfd_target_elf_flavour
))
3031 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3032 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3034 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3037 if (h
->dynindx
== -1
3038 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3039 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3041 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3050 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3051 was first seen in a non-ELF file. Fortunately, if the symbol
3052 was first seen in an ELF file, we're probably OK unless the
3053 symbol was defined in a non-ELF file. Catch that case here.
3054 FIXME: We're still in trouble if the symbol was first seen in
3055 a dynamic object, and then later in a non-ELF regular object. */
3056 if ((h
->root
.type
== bfd_link_hash_defined
3057 || h
->root
.type
== bfd_link_hash_defweak
)
3058 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3059 && (h
->root
.u
.def
.section
->owner
!= NULL
3060 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3061 != bfd_target_elf_flavour
)
3062 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3063 && (h
->elf_link_hash_flags
3064 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3065 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3068 /* If this is a final link, and the symbol was defined as a common
3069 symbol in a regular object file, and there was no definition in
3070 any dynamic object, then the linker will have allocated space for
3071 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3072 flag will not have been set. */
3073 if (h
->root
.type
== bfd_link_hash_defined
3074 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3075 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3076 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3077 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3078 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3080 /* If -Bsymbolic was used (which means to bind references to global
3081 symbols to the definition within the shared object), and this
3082 symbol was defined in a regular object, then it actually doesn't
3083 need a PLT entry. */
3084 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3085 && eif
->info
->shared
3086 && eif
->info
->symbolic
3087 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3089 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3090 h
->plt
.offset
= (bfd_vma
) -1;
3096 /* Make the backend pick a good value for a dynamic symbol. This is
3097 called via elf_link_hash_traverse, and also calls itself
3101 elf_adjust_dynamic_symbol (h
, data
)
3102 struct elf_link_hash_entry
*h
;
3105 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3107 struct elf_backend_data
*bed
;
3109 /* Ignore indirect symbols. These are added by the versioning code. */
3110 if (h
->root
.type
== bfd_link_hash_indirect
)
3113 /* Fix the symbol flags. */
3114 if (! elf_fix_symbol_flags (h
, eif
))
3117 /* If this symbol does not require a PLT entry, and it is not
3118 defined by a dynamic object, or is not referenced by a regular
3119 object, ignore it. We do have to handle a weak defined symbol,
3120 even if no regular object refers to it, if we decided to add it
3121 to the dynamic symbol table. FIXME: Do we normally need to worry
3122 about symbols which are defined by one dynamic object and
3123 referenced by another one? */
3124 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3125 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3126 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3127 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3128 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3130 h
->plt
.offset
= (bfd_vma
) -1;
3134 /* If we've already adjusted this symbol, don't do it again. This
3135 can happen via a recursive call. */
3136 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3139 /* Don't look at this symbol again. Note that we must set this
3140 after checking the above conditions, because we may look at a
3141 symbol once, decide not to do anything, and then get called
3142 recursively later after REF_REGULAR is set below. */
3143 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3145 /* If this is a weak definition, and we know a real definition, and
3146 the real symbol is not itself defined by a regular object file,
3147 then get a good value for the real definition. We handle the
3148 real symbol first, for the convenience of the backend routine.
3150 Note that there is a confusing case here. If the real definition
3151 is defined by a regular object file, we don't get the real symbol
3152 from the dynamic object, but we do get the weak symbol. If the
3153 processor backend uses a COPY reloc, then if some routine in the
3154 dynamic object changes the real symbol, we will not see that
3155 change in the corresponding weak symbol. This is the way other
3156 ELF linkers work as well, and seems to be a result of the shared
3159 I will clarify this issue. Most SVR4 shared libraries define the
3160 variable _timezone and define timezone as a weak synonym. The
3161 tzset call changes _timezone. If you write
3162 extern int timezone;
3164 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3165 you might expect that, since timezone is a synonym for _timezone,
3166 the same number will print both times. However, if the processor
3167 backend uses a COPY reloc, then actually timezone will be copied
3168 into your process image, and, since you define _timezone
3169 yourself, _timezone will not. Thus timezone and _timezone will
3170 wind up at different memory locations. The tzset call will set
3171 _timezone, leaving timezone unchanged. */
3173 if (h
->weakdef
!= NULL
)
3175 struct elf_link_hash_entry
*weakdef
;
3177 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3178 || h
->root
.type
== bfd_link_hash_defweak
);
3179 weakdef
= h
->weakdef
;
3180 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3181 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3182 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3183 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3185 /* This symbol is defined by a regular object file, so we
3186 will not do anything special. Clear weakdef for the
3187 convenience of the processor backend. */
3192 /* There is an implicit reference by a regular object file
3193 via the weak symbol. */
3194 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3195 if (h
->weakdef
->elf_link_hash_flags
3196 & ELF_LINK_HASH_REF_REGULAR_NONWEAK
)
3197 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
3198 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
3203 /* If a symbol has no type and no size and does not require a PLT
3204 entry, then we are probably about to do the wrong thing here: we
3205 are probably going to create a COPY reloc for an empty object.
3206 This case can arise when a shared object is built with assembly
3207 code, and the assembly code fails to set the symbol type. */
3209 && h
->type
== STT_NOTYPE
3210 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3211 (*_bfd_error_handler
)
3212 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3213 h
->root
.root
.string
);
3215 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3216 bed
= get_elf_backend_data (dynobj
);
3217 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3226 /* This routine is used to export all defined symbols into the dynamic
3227 symbol table. It is called via elf_link_hash_traverse. */
3230 elf_export_symbol (h
, data
)
3231 struct elf_link_hash_entry
*h
;
3234 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3236 /* Ignore indirect symbols. These are added by the versioning code. */
3237 if (h
->root
.type
== bfd_link_hash_indirect
)
3240 if (h
->dynindx
== -1
3241 && (h
->elf_link_hash_flags
3242 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3244 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3254 /* Look through the symbols which are defined in other shared
3255 libraries and referenced here. Update the list of version
3256 dependencies. This will be put into the .gnu.version_r section.
3257 This function is called via elf_link_hash_traverse. */
3260 elf_link_find_version_dependencies (h
, data
)
3261 struct elf_link_hash_entry
*h
;
3264 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3265 Elf_Internal_Verneed
*t
;
3266 Elf_Internal_Vernaux
*a
;
3268 /* We only care about symbols defined in shared objects with version
3270 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3271 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3273 || h
->verinfo
.verdef
== NULL
)
3276 /* See if we already know about this version. */
3277 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3279 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3282 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3283 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3289 /* This is a new version. Add it to tree we are building. */
3293 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3296 rinfo
->failed
= true;
3300 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3301 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3302 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3305 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3307 /* Note that we are copying a string pointer here, and testing it
3308 above. If bfd_elf_string_from_elf_section is ever changed to
3309 discard the string data when low in memory, this will have to be
3311 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3313 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3314 a
->vna_nextptr
= t
->vn_auxptr
;
3316 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3319 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3326 /* Figure out appropriate versions for all the symbols. We may not
3327 have the version number script until we have read all of the input
3328 files, so until that point we don't know which symbols should be
3329 local. This function is called via elf_link_hash_traverse. */
3332 elf_link_assign_sym_version (h
, data
)
3333 struct elf_link_hash_entry
*h
;
3336 struct elf_assign_sym_version_info
*sinfo
=
3337 (struct elf_assign_sym_version_info
*) data
;
3338 struct bfd_link_info
*info
= sinfo
->info
;
3339 struct elf_info_failed eif
;
3342 /* Fix the symbol flags. */
3345 if (! elf_fix_symbol_flags (h
, &eif
))
3348 sinfo
->failed
= true;
3352 /* We only need version numbers for symbols defined in regular
3354 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3357 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3358 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3360 struct bfd_elf_version_tree
*t
;
3365 /* There are two consecutive ELF_VER_CHR characters if this is
3366 not a hidden symbol. */
3368 if (*p
== ELF_VER_CHR
)
3374 /* If there is no version string, we can just return out. */
3378 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3382 /* Look for the version. If we find it, it is no longer weak. */
3383 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3385 if (strcmp (t
->name
, p
) == 0)
3389 struct bfd_elf_version_expr
*d
;
3391 len
= p
- h
->root
.root
.string
;
3392 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3395 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3396 alc
[len
- 1] = '\0';
3397 if (alc
[len
- 2] == ELF_VER_CHR
)
3398 alc
[len
- 2] = '\0';
3400 h
->verinfo
.vertree
= t
;
3404 if (t
->globals
!= NULL
)
3406 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3407 if ((*d
->match
) (d
, alc
))
3411 /* See if there is anything to force this symbol to
3413 if (d
== NULL
&& t
->locals
!= NULL
)
3415 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3417 if ((*d
->match
) (d
, alc
))
3419 if (h
->dynindx
!= -1
3421 && ! sinfo
->export_dynamic
)
3423 sinfo
->removed_dynamic
= true;
3424 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3425 h
->elf_link_hash_flags
&=~
3426 ELF_LINK_HASH_NEEDS_PLT
;
3428 h
->plt
.offset
= (bfd_vma
) -1;
3429 /* FIXME: The name of the symbol has
3430 already been recorded in the dynamic
3431 string table section. */
3439 bfd_release (sinfo
->output_bfd
, alc
);
3444 /* If we are building an application, we need to create a
3445 version node for this version. */
3446 if (t
== NULL
&& ! info
->shared
)
3448 struct bfd_elf_version_tree
**pp
;
3451 /* If we aren't going to export this symbol, we don't need
3452 to worry about it. */
3453 if (h
->dynindx
== -1)
3456 t
= ((struct bfd_elf_version_tree
*)
3457 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3460 sinfo
->failed
= true;
3469 t
->name_indx
= (unsigned int) -1;
3473 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3475 t
->vernum
= version_index
;
3479 h
->verinfo
.vertree
= t
;
3483 /* We could not find the version for a symbol when
3484 generating a shared archive. Return an error. */
3485 (*_bfd_error_handler
)
3486 (_("%s: undefined versioned symbol name %s"),
3487 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3488 bfd_set_error (bfd_error_bad_value
);
3489 sinfo
->failed
= true;
3494 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3497 /* If we don't have a version for this symbol, see if we can find
3499 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3501 struct bfd_elf_version_tree
*t
;
3502 struct bfd_elf_version_tree
*deflt
;
3503 struct bfd_elf_version_expr
*d
;
3505 /* See if can find what version this symbol is in. If the
3506 symbol is supposed to be local, then don't actually register
3509 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3511 if (t
->globals
!= NULL
)
3513 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3515 if ((*d
->match
) (d
, h
->root
.root
.string
))
3517 h
->verinfo
.vertree
= t
;
3526 if (t
->locals
!= NULL
)
3528 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3530 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3532 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3534 h
->verinfo
.vertree
= t
;
3535 if (h
->dynindx
!= -1
3537 && ! sinfo
->export_dynamic
)
3539 sinfo
->removed_dynamic
= true;
3540 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3541 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3543 h
->plt
.offset
= (bfd_vma
) -1;
3544 /* FIXME: The name of the symbol has already
3545 been recorded in the dynamic string table
3557 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3559 h
->verinfo
.vertree
= deflt
;
3560 if (h
->dynindx
!= -1
3562 && ! sinfo
->export_dynamic
)
3564 sinfo
->removed_dynamic
= true;
3565 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3566 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3568 h
->plt
.offset
= (bfd_vma
) -1;
3569 /* FIXME: The name of the symbol has already been
3570 recorded in the dynamic string table section. */
3578 /* This function is used to renumber the dynamic symbols, if some of
3579 them are removed because they are marked as local. This is called
3580 via elf_link_hash_traverse. */
3583 elf_link_renumber_dynsyms (h
, data
)
3584 struct elf_link_hash_entry
*h
;
3587 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3589 if (h
->dynindx
!= -1)
3591 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3592 ++elf_hash_table (info
)->dynsymcount
;
3598 /* Final phase of ELF linker. */
3600 /* A structure we use to avoid passing large numbers of arguments. */
3602 struct elf_final_link_info
3604 /* General link information. */
3605 struct bfd_link_info
*info
;
3608 /* Symbol string table. */
3609 struct bfd_strtab_hash
*symstrtab
;
3610 /* .dynsym section. */
3611 asection
*dynsym_sec
;
3612 /* .hash section. */
3614 /* symbol version section (.gnu.version). */
3615 asection
*symver_sec
;
3616 /* Buffer large enough to hold contents of any section. */
3618 /* Buffer large enough to hold external relocs of any section. */
3619 PTR external_relocs
;
3620 /* Buffer large enough to hold internal relocs of any section. */
3621 Elf_Internal_Rela
*internal_relocs
;
3622 /* Buffer large enough to hold external local symbols of any input
3624 Elf_External_Sym
*external_syms
;
3625 /* Buffer large enough to hold internal local symbols of any input
3627 Elf_Internal_Sym
*internal_syms
;
3628 /* Array large enough to hold a symbol index for each local symbol
3629 of any input BFD. */
3631 /* Array large enough to hold a section pointer for each local
3632 symbol of any input BFD. */
3633 asection
**sections
;
3634 /* Buffer to hold swapped out symbols. */
3635 Elf_External_Sym
*symbuf
;
3636 /* Number of swapped out symbols in buffer. */
3637 size_t symbuf_count
;
3638 /* Number of symbols which fit in symbuf. */
3642 static boolean elf_link_output_sym
3643 PARAMS ((struct elf_final_link_info
*, const char *,
3644 Elf_Internal_Sym
*, asection
*));
3645 static boolean elf_link_flush_output_syms
3646 PARAMS ((struct elf_final_link_info
*));
3647 static boolean elf_link_output_extsym
3648 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3649 static boolean elf_link_input_bfd
3650 PARAMS ((struct elf_final_link_info
*, bfd
*));
3651 static boolean elf_reloc_link_order
3652 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3653 struct bfd_link_order
*));
3655 /* This struct is used to pass information to elf_link_output_extsym. */
3657 struct elf_outext_info
3661 struct elf_final_link_info
*finfo
;
3664 /* Do the final step of an ELF link. */
3667 elf_bfd_final_link (abfd
, info
)
3669 struct bfd_link_info
*info
;
3673 struct elf_final_link_info finfo
;
3674 register asection
*o
;
3675 register struct bfd_link_order
*p
;
3677 size_t max_contents_size
;
3678 size_t max_external_reloc_size
;
3679 size_t max_internal_reloc_count
;
3680 size_t max_sym_count
;
3682 Elf_Internal_Sym elfsym
;
3684 Elf_Internal_Shdr
*symtab_hdr
;
3685 Elf_Internal_Shdr
*symstrtab_hdr
;
3686 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3687 struct elf_outext_info eoinfo
;
3690 abfd
->flags
|= DYNAMIC
;
3692 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3693 dynobj
= elf_hash_table (info
)->dynobj
;
3696 finfo
.output_bfd
= abfd
;
3697 finfo
.symstrtab
= elf_stringtab_init ();
3698 if (finfo
.symstrtab
== NULL
)
3703 finfo
.dynsym_sec
= NULL
;
3704 finfo
.hash_sec
= NULL
;
3705 finfo
.symver_sec
= NULL
;
3709 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3710 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3711 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3712 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3713 /* Note that it is OK if symver_sec is NULL. */
3716 finfo
.contents
= NULL
;
3717 finfo
.external_relocs
= NULL
;
3718 finfo
.internal_relocs
= NULL
;
3719 finfo
.external_syms
= NULL
;
3720 finfo
.internal_syms
= NULL
;
3721 finfo
.indices
= NULL
;
3722 finfo
.sections
= NULL
;
3723 finfo
.symbuf
= NULL
;
3724 finfo
.symbuf_count
= 0;
3726 /* Count up the number of relocations we will output for each output
3727 section, so that we know the sizes of the reloc sections. We
3728 also figure out some maximum sizes. */
3729 max_contents_size
= 0;
3730 max_external_reloc_size
= 0;
3731 max_internal_reloc_count
= 0;
3733 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3737 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3739 if (p
->type
== bfd_section_reloc_link_order
3740 || p
->type
== bfd_symbol_reloc_link_order
)
3742 else if (p
->type
== bfd_indirect_link_order
)
3746 sec
= p
->u
.indirect
.section
;
3748 /* Mark all sections which are to be included in the
3749 link. This will normally be every section. We need
3750 to do this so that we can identify any sections which
3751 the linker has decided to not include. */
3752 sec
->linker_mark
= true;
3754 if (info
->relocateable
)
3755 o
->reloc_count
+= sec
->reloc_count
;
3757 if (sec
->_raw_size
> max_contents_size
)
3758 max_contents_size
= sec
->_raw_size
;
3759 if (sec
->_cooked_size
> max_contents_size
)
3760 max_contents_size
= sec
->_cooked_size
;
3762 /* We are interested in just local symbols, not all
3764 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3765 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3769 if (elf_bad_symtab (sec
->owner
))
3770 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3771 / sizeof (Elf_External_Sym
));
3773 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3775 if (sym_count
> max_sym_count
)
3776 max_sym_count
= sym_count
;
3778 if ((sec
->flags
& SEC_RELOC
) != 0)
3782 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3783 if (ext_size
> max_external_reloc_size
)
3784 max_external_reloc_size
= ext_size
;
3785 if (sec
->reloc_count
> max_internal_reloc_count
)
3786 max_internal_reloc_count
= sec
->reloc_count
;
3792 if (o
->reloc_count
> 0)
3793 o
->flags
|= SEC_RELOC
;
3796 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3797 set it (this is probably a bug) and if it is set
3798 assign_section_numbers will create a reloc section. */
3799 o
->flags
&=~ SEC_RELOC
;
3802 /* If the SEC_ALLOC flag is not set, force the section VMA to
3803 zero. This is done in elf_fake_sections as well, but forcing
3804 the VMA to 0 here will ensure that relocs against these
3805 sections are handled correctly. */
3806 if ((o
->flags
& SEC_ALLOC
) == 0
3807 && ! o
->user_set_vma
)
3811 /* Figure out the file positions for everything but the symbol table
3812 and the relocs. We set symcount to force assign_section_numbers
3813 to create a symbol table. */
3814 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
3815 BFD_ASSERT (! abfd
->output_has_begun
);
3816 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3819 /* That created the reloc sections. Set their sizes, and assign
3820 them file positions, and allocate some buffers. */
3821 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3823 if ((o
->flags
& SEC_RELOC
) != 0)
3825 Elf_Internal_Shdr
*rel_hdr
;
3826 register struct elf_link_hash_entry
**p
, **pend
;
3828 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3830 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3832 /* The contents field must last into write_object_contents,
3833 so we allocate it with bfd_alloc rather than malloc. */
3834 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3835 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3838 p
= ((struct elf_link_hash_entry
**)
3839 bfd_malloc (o
->reloc_count
3840 * sizeof (struct elf_link_hash_entry
*)));
3841 if (p
== NULL
&& o
->reloc_count
!= 0)
3843 elf_section_data (o
)->rel_hashes
= p
;
3844 pend
= p
+ o
->reloc_count
;
3845 for (; p
< pend
; p
++)
3848 /* Use the reloc_count field as an index when outputting the
3854 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3856 /* We have now assigned file positions for all the sections except
3857 .symtab and .strtab. We start the .symtab section at the current
3858 file position, and write directly to it. We build the .strtab
3859 section in memory. */
3860 bfd_get_symcount (abfd
) = 0;
3861 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3862 /* sh_name is set in prep_headers. */
3863 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3864 symtab_hdr
->sh_flags
= 0;
3865 symtab_hdr
->sh_addr
= 0;
3866 symtab_hdr
->sh_size
= 0;
3867 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3868 /* sh_link is set in assign_section_numbers. */
3869 /* sh_info is set below. */
3870 /* sh_offset is set just below. */
3871 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3873 off
= elf_tdata (abfd
)->next_file_pos
;
3874 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3876 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3877 incorrect. We do not yet know the size of the .symtab section.
3878 We correct next_file_pos below, after we do know the size. */
3880 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3881 continuously seeking to the right position in the file. */
3882 if (! info
->keep_memory
|| max_sym_count
< 20)
3883 finfo
.symbuf_size
= 20;
3885 finfo
.symbuf_size
= max_sym_count
;
3886 finfo
.symbuf
= ((Elf_External_Sym
*)
3887 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3888 if (finfo
.symbuf
== NULL
)
3891 /* Start writing out the symbol table. The first symbol is always a
3893 if (info
->strip
!= strip_all
|| info
->relocateable
)
3895 elfsym
.st_value
= 0;
3898 elfsym
.st_other
= 0;
3899 elfsym
.st_shndx
= SHN_UNDEF
;
3900 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3901 &elfsym
, bfd_und_section_ptr
))
3906 /* Some standard ELF linkers do this, but we don't because it causes
3907 bootstrap comparison failures. */
3908 /* Output a file symbol for the output file as the second symbol.
3909 We output this even if we are discarding local symbols, although
3910 I'm not sure if this is correct. */
3911 elfsym
.st_value
= 0;
3913 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3914 elfsym
.st_other
= 0;
3915 elfsym
.st_shndx
= SHN_ABS
;
3916 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3917 &elfsym
, bfd_abs_section_ptr
))
3921 /* Output a symbol for each section. We output these even if we are
3922 discarding local symbols, since they are used for relocs. These
3923 symbols have no names. We store the index of each one in the
3924 index field of the section, so that we can find it again when
3925 outputting relocs. */
3926 if (info
->strip
!= strip_all
|| info
->relocateable
)
3929 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3930 elfsym
.st_other
= 0;
3931 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3933 o
= section_from_elf_index (abfd
, i
);
3935 o
->target_index
= bfd_get_symcount (abfd
);
3936 elfsym
.st_shndx
= i
;
3937 if (info
->relocateable
|| o
== NULL
)
3938 elfsym
.st_value
= 0;
3940 elfsym
.st_value
= o
->vma
;
3941 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3947 /* Allocate some memory to hold information read in from the input
3949 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3950 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3951 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3952 bfd_malloc (max_internal_reloc_count
3953 * sizeof (Elf_Internal_Rela
)));
3954 finfo
.external_syms
= ((Elf_External_Sym
*)
3955 bfd_malloc (max_sym_count
3956 * sizeof (Elf_External_Sym
)));
3957 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3958 bfd_malloc (max_sym_count
3959 * sizeof (Elf_Internal_Sym
)));
3960 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3961 finfo
.sections
= ((asection
**)
3962 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3963 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3964 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3965 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3966 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3967 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3968 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3969 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3972 /* Since ELF permits relocations to be against local symbols, we
3973 must have the local symbols available when we do the relocations.
3974 Since we would rather only read the local symbols once, and we
3975 would rather not keep them in memory, we handle all the
3976 relocations for a single input file at the same time.
3978 Unfortunately, there is no way to know the total number of local
3979 symbols until we have seen all of them, and the local symbol
3980 indices precede the global symbol indices. This means that when
3981 we are generating relocateable output, and we see a reloc against
3982 a global symbol, we can not know the symbol index until we have
3983 finished examining all the local symbols to see which ones we are
3984 going to output. To deal with this, we keep the relocations in
3985 memory, and don't output them until the end of the link. This is
3986 an unfortunate waste of memory, but I don't see a good way around
3987 it. Fortunately, it only happens when performing a relocateable
3988 link, which is not the common case. FIXME: If keep_memory is set
3989 we could write the relocs out and then read them again; I don't
3990 know how bad the memory loss will be. */
3992 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
3993 sub
->output_has_begun
= false;
3994 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3996 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3998 if (p
->type
== bfd_indirect_link_order
3999 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4000 == bfd_target_elf_flavour
))
4002 sub
= p
->u
.indirect
.section
->owner
;
4003 if (! sub
->output_has_begun
)
4005 if (! elf_link_input_bfd (&finfo
, sub
))
4007 sub
->output_has_begun
= true;
4010 else if (p
->type
== bfd_section_reloc_link_order
4011 || p
->type
== bfd_symbol_reloc_link_order
)
4013 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4018 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4024 /* That wrote out all the local symbols. Finish up the symbol table
4025 with the global symbols. */
4027 if (info
->strip
!= strip_all
&& info
->shared
)
4029 /* Output any global symbols that got converted to local in a
4030 version script. We do this in a separate step since ELF
4031 requires all local symbols to appear prior to any global
4032 symbols. FIXME: We should only do this if some global
4033 symbols were, in fact, converted to become local. FIXME:
4034 Will this work correctly with the Irix 5 linker? */
4035 eoinfo
.failed
= false;
4036 eoinfo
.finfo
= &finfo
;
4037 eoinfo
.localsyms
= true;
4038 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4044 /* The sh_info field records the index of the first non local
4046 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4048 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
4050 /* We get the global symbols from the hash table. */
4051 eoinfo
.failed
= false;
4052 eoinfo
.localsyms
= false;
4053 eoinfo
.finfo
= &finfo
;
4054 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4059 /* Flush all symbols to the file. */
4060 if (! elf_link_flush_output_syms (&finfo
))
4063 /* Now we know the size of the symtab section. */
4064 off
+= symtab_hdr
->sh_size
;
4066 /* Finish up and write out the symbol string table (.strtab)
4068 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4069 /* sh_name was set in prep_headers. */
4070 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4071 symstrtab_hdr
->sh_flags
= 0;
4072 symstrtab_hdr
->sh_addr
= 0;
4073 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4074 symstrtab_hdr
->sh_entsize
= 0;
4075 symstrtab_hdr
->sh_link
= 0;
4076 symstrtab_hdr
->sh_info
= 0;
4077 /* sh_offset is set just below. */
4078 symstrtab_hdr
->sh_addralign
= 1;
4080 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4081 elf_tdata (abfd
)->next_file_pos
= off
;
4083 if (bfd_get_symcount (abfd
) > 0)
4085 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4086 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4090 /* Adjust the relocs to have the correct symbol indices. */
4091 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4093 struct elf_link_hash_entry
**rel_hash
;
4094 Elf_Internal_Shdr
*rel_hdr
;
4096 if ((o
->flags
& SEC_RELOC
) == 0)
4099 rel_hash
= elf_section_data (o
)->rel_hashes
;
4100 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4101 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
4103 if (*rel_hash
== NULL
)
4106 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4108 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4110 Elf_External_Rel
*erel
;
4111 Elf_Internal_Rel irel
;
4113 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4114 elf_swap_reloc_in (abfd
, erel
, &irel
);
4115 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4116 ELF_R_TYPE (irel
.r_info
));
4117 elf_swap_reloc_out (abfd
, &irel
, erel
);
4121 Elf_External_Rela
*erela
;
4122 Elf_Internal_Rela irela
;
4124 BFD_ASSERT (rel_hdr
->sh_entsize
4125 == sizeof (Elf_External_Rela
));
4127 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4128 elf_swap_reloca_in (abfd
, erela
, &irela
);
4129 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4130 ELF_R_TYPE (irela
.r_info
));
4131 elf_swap_reloca_out (abfd
, &irela
, erela
);
4135 /* Set the reloc_count field to 0 to prevent write_relocs from
4136 trying to swap the relocs out itself. */
4140 /* If we are linking against a dynamic object, or generating a
4141 shared library, finish up the dynamic linking information. */
4144 Elf_External_Dyn
*dyncon
, *dynconend
;
4146 /* Fix up .dynamic entries. */
4147 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4148 BFD_ASSERT (o
!= NULL
);
4150 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4151 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4152 for (; dyncon
< dynconend
; dyncon
++)
4154 Elf_Internal_Dyn dyn
;
4158 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4165 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
4166 magic _init and _fini symbols. This is pretty ugly,
4167 but we are compatible. */
4175 struct elf_link_hash_entry
*h
;
4177 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4178 false, false, true);
4180 && (h
->root
.type
== bfd_link_hash_defined
4181 || h
->root
.type
== bfd_link_hash_defweak
))
4183 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4184 o
= h
->root
.u
.def
.section
;
4185 if (o
->output_section
!= NULL
)
4186 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4187 + o
->output_offset
);
4190 /* The symbol is imported from another shared
4191 library and does not apply to this one. */
4195 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4210 name
= ".gnu.version_d";
4213 name
= ".gnu.version_r";
4216 name
= ".gnu.version";
4218 o
= bfd_get_section_by_name (abfd
, name
);
4219 BFD_ASSERT (o
!= NULL
);
4220 dyn
.d_un
.d_ptr
= o
->vma
;
4221 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4228 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4233 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4235 Elf_Internal_Shdr
*hdr
;
4237 hdr
= elf_elfsections (abfd
)[i
];
4238 if (hdr
->sh_type
== type
4239 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4241 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4242 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4245 if (dyn
.d_un
.d_val
== 0
4246 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4247 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4251 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4257 /* If we have created any dynamic sections, then output them. */
4260 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4263 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4265 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4266 || o
->_raw_size
== 0)
4268 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4270 /* At this point, we are only interested in sections
4271 created by elf_link_create_dynamic_sections. */
4274 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4276 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4278 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4279 o
->contents
, o
->output_offset
,
4287 /* The contents of the .dynstr section are actually in a
4289 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4290 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4291 || ! _bfd_stringtab_emit (abfd
,
4292 elf_hash_table (info
)->dynstr
))
4298 /* If we have optimized stabs strings, output them. */
4299 if (elf_hash_table (info
)->stab_info
!= NULL
)
4301 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4305 if (finfo
.symstrtab
!= NULL
)
4306 _bfd_stringtab_free (finfo
.symstrtab
);
4307 if (finfo
.contents
!= NULL
)
4308 free (finfo
.contents
);
4309 if (finfo
.external_relocs
!= NULL
)
4310 free (finfo
.external_relocs
);
4311 if (finfo
.internal_relocs
!= NULL
)
4312 free (finfo
.internal_relocs
);
4313 if (finfo
.external_syms
!= NULL
)
4314 free (finfo
.external_syms
);
4315 if (finfo
.internal_syms
!= NULL
)
4316 free (finfo
.internal_syms
);
4317 if (finfo
.indices
!= NULL
)
4318 free (finfo
.indices
);
4319 if (finfo
.sections
!= NULL
)
4320 free (finfo
.sections
);
4321 if (finfo
.symbuf
!= NULL
)
4322 free (finfo
.symbuf
);
4323 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4325 if ((o
->flags
& SEC_RELOC
) != 0
4326 && elf_section_data (o
)->rel_hashes
!= NULL
)
4327 free (elf_section_data (o
)->rel_hashes
);
4330 elf_tdata (abfd
)->linker
= true;
4335 if (finfo
.symstrtab
!= NULL
)
4336 _bfd_stringtab_free (finfo
.symstrtab
);
4337 if (finfo
.contents
!= NULL
)
4338 free (finfo
.contents
);
4339 if (finfo
.external_relocs
!= NULL
)
4340 free (finfo
.external_relocs
);
4341 if (finfo
.internal_relocs
!= NULL
)
4342 free (finfo
.internal_relocs
);
4343 if (finfo
.external_syms
!= NULL
)
4344 free (finfo
.external_syms
);
4345 if (finfo
.internal_syms
!= NULL
)
4346 free (finfo
.internal_syms
);
4347 if (finfo
.indices
!= NULL
)
4348 free (finfo
.indices
);
4349 if (finfo
.sections
!= NULL
)
4350 free (finfo
.sections
);
4351 if (finfo
.symbuf
!= NULL
)
4352 free (finfo
.symbuf
);
4353 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4355 if ((o
->flags
& SEC_RELOC
) != 0
4356 && elf_section_data (o
)->rel_hashes
!= NULL
)
4357 free (elf_section_data (o
)->rel_hashes
);
4363 /* Add a symbol to the output symbol table. */
4366 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4367 struct elf_final_link_info
*finfo
;
4369 Elf_Internal_Sym
*elfsym
;
4370 asection
*input_sec
;
4372 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4373 struct bfd_link_info
*info
,
4378 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4379 elf_backend_link_output_symbol_hook
;
4380 if (output_symbol_hook
!= NULL
)
4382 if (! ((*output_symbol_hook
)
4383 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4387 if (name
== (const char *) NULL
|| *name
== '\0')
4388 elfsym
->st_name
= 0;
4389 else if (input_sec
->flags
& SEC_EXCLUDE
)
4390 elfsym
->st_name
= 0;
4393 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4396 if (elfsym
->st_name
== (unsigned long) -1)
4400 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4402 if (! elf_link_flush_output_syms (finfo
))
4406 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4407 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4408 ++finfo
->symbuf_count
;
4410 ++ bfd_get_symcount (finfo
->output_bfd
);
4415 /* Flush the output symbols to the file. */
4418 elf_link_flush_output_syms (finfo
)
4419 struct elf_final_link_info
*finfo
;
4421 if (finfo
->symbuf_count
> 0)
4423 Elf_Internal_Shdr
*symtab
;
4425 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4427 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4429 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4430 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4431 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4434 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4436 finfo
->symbuf_count
= 0;
4442 /* Add an external symbol to the symbol table. This is called from
4443 the hash table traversal routine. When generating a shared object,
4444 we go through the symbol table twice. The first time we output
4445 anything that might have been forced to local scope in a version
4446 script. The second time we output the symbols that are still
4450 elf_link_output_extsym (h
, data
)
4451 struct elf_link_hash_entry
*h
;
4454 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4455 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4457 Elf_Internal_Sym sym
;
4458 asection
*input_sec
;
4460 /* Decide whether to output this symbol in this pass. */
4461 if (eoinfo
->localsyms
)
4463 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4468 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4472 /* If we are not creating a shared library, and this symbol is
4473 referenced by a shared library but is not defined anywhere, then
4474 warn that it is undefined. If we do not do this, the runtime
4475 linker will complain that the symbol is undefined when the
4476 program is run. We don't have to worry about symbols that are
4477 referenced by regular files, because we will already have issued
4478 warnings for them. */
4479 if (! finfo
->info
->relocateable
4480 && ! (finfo
->info
->shared
4481 && !finfo
->info
->symbolic
4482 && !finfo
->info
->no_undefined
)
4483 && h
->root
.type
== bfd_link_hash_undefined
4484 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4485 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4487 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4488 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4489 (asection
*) NULL
, 0)))
4491 eoinfo
->failed
= true;
4496 /* We don't want to output symbols that have never been mentioned by
4497 a regular file, or that we have been told to strip. However, if
4498 h->indx is set to -2, the symbol is used by a reloc and we must
4502 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4503 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4504 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4505 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4507 else if (finfo
->info
->strip
== strip_all
4508 || (finfo
->info
->strip
== strip_some
4509 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4510 h
->root
.root
.string
,
4511 false, false) == NULL
))
4516 /* If we're stripping it, and it's not a dynamic symbol, there's
4517 nothing else to do. */
4518 if (strip
&& h
->dynindx
== -1)
4522 sym
.st_size
= h
->size
;
4523 sym
.st_other
= h
->other
;
4524 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4525 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4526 else if (h
->root
.type
== bfd_link_hash_undefweak
4527 || h
->root
.type
== bfd_link_hash_defweak
)
4528 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4530 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4532 switch (h
->root
.type
)
4535 case bfd_link_hash_new
:
4539 case bfd_link_hash_undefined
:
4540 input_sec
= bfd_und_section_ptr
;
4541 sym
.st_shndx
= SHN_UNDEF
;
4544 case bfd_link_hash_undefweak
:
4545 input_sec
= bfd_und_section_ptr
;
4546 sym
.st_shndx
= SHN_UNDEF
;
4549 case bfd_link_hash_defined
:
4550 case bfd_link_hash_defweak
:
4552 input_sec
= h
->root
.u
.def
.section
;
4553 if (input_sec
->output_section
!= NULL
)
4556 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4557 input_sec
->output_section
);
4558 if (sym
.st_shndx
== (unsigned short) -1)
4560 (*_bfd_error_handler
)
4561 (_("%s: could not find output section %s for input section %s"),
4562 bfd_get_filename (finfo
->output_bfd
),
4563 input_sec
->output_section
->name
,
4565 eoinfo
->failed
= true;
4569 /* ELF symbols in relocateable files are section relative,
4570 but in nonrelocateable files they are virtual
4572 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4573 if (! finfo
->info
->relocateable
)
4574 sym
.st_value
+= input_sec
->output_section
->vma
;
4578 BFD_ASSERT (input_sec
->owner
== NULL
4579 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4580 sym
.st_shndx
= SHN_UNDEF
;
4581 input_sec
= bfd_und_section_ptr
;
4586 case bfd_link_hash_common
:
4587 input_sec
= h
->root
.u
.c
.p
->section
;
4588 sym
.st_shndx
= SHN_COMMON
;
4589 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4592 case bfd_link_hash_indirect
:
4593 /* These symbols are created by symbol versioning. They point
4594 to the decorated version of the name. For example, if the
4595 symbol foo@@GNU_1.2 is the default, which should be used when
4596 foo is used with no version, then we add an indirect symbol
4597 foo which points to foo@@GNU_1.2. We ignore these symbols,
4598 since the indirected symbol is already in the hash table. If
4599 the indirect symbol is non-ELF, fall through and output it. */
4600 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4604 case bfd_link_hash_warning
:
4605 /* We can't represent these symbols in ELF, although a warning
4606 symbol may have come from a .gnu.warning.SYMBOL section. We
4607 just put the target symbol in the hash table. If the target
4608 symbol does not really exist, don't do anything. */
4609 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4611 return (elf_link_output_extsym
4612 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4615 /* Give the processor backend a chance to tweak the symbol value,
4616 and also to finish up anything that needs to be done for this
4618 if ((h
->dynindx
!= -1
4619 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4620 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4622 struct elf_backend_data
*bed
;
4624 bed
= get_elf_backend_data (finfo
->output_bfd
);
4625 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4626 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4628 eoinfo
->failed
= true;
4633 /* If we are marking the symbol as undefined, and there are no
4634 non-weak references to this symbol from a regular object, then
4635 mark the symbol as weak undefined. We can't do this earlier,
4636 because it might not be marked as undefined until the
4637 finish_dynamic_symbol routine gets through with it. */
4638 if (sym
.st_shndx
== SHN_UNDEF
4639 && sym
.st_info
== ELF_ST_INFO (STB_GLOBAL
, h
->type
)
4640 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
4641 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) == 0)
4642 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4644 /* If this symbol should be put in the .dynsym section, then put it
4645 there now. We have already know the symbol index. We also fill
4646 in the entry in the .hash section. */
4647 if (h
->dynindx
!= -1
4648 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4652 bfd_byte
*bucketpos
;
4655 sym
.st_name
= h
->dynstr_index
;
4657 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4658 (PTR
) (((Elf_External_Sym
*)
4659 finfo
->dynsym_sec
->contents
)
4662 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4663 bucket
= h
->elf_hash_value
% bucketcount
;
4664 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4665 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4666 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4667 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4668 put_word (finfo
->output_bfd
, chain
,
4669 ((bfd_byte
*) finfo
->hash_sec
->contents
4670 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4672 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4674 Elf_Internal_Versym iversym
;
4676 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4678 if (h
->verinfo
.verdef
== NULL
)
4679 iversym
.vs_vers
= 0;
4681 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4685 if (h
->verinfo
.vertree
== NULL
)
4686 iversym
.vs_vers
= 1;
4688 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4691 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4692 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4694 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4695 (((Elf_External_Versym
*)
4696 finfo
->symver_sec
->contents
)
4701 /* If we're stripping it, then it was just a dynamic symbol, and
4702 there's nothing else to do. */
4706 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
4708 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4710 eoinfo
->failed
= true;
4717 /* Link an input file into the linker output file. This function
4718 handles all the sections and relocations of the input file at once.
4719 This is so that we only have to read the local symbols once, and
4720 don't have to keep them in memory. */
4723 elf_link_input_bfd (finfo
, input_bfd
)
4724 struct elf_final_link_info
*finfo
;
4727 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4728 bfd
*, asection
*, bfd_byte
*,
4729 Elf_Internal_Rela
*,
4730 Elf_Internal_Sym
*, asection
**));
4732 Elf_Internal_Shdr
*symtab_hdr
;
4735 Elf_External_Sym
*external_syms
;
4736 Elf_External_Sym
*esym
;
4737 Elf_External_Sym
*esymend
;
4738 Elf_Internal_Sym
*isym
;
4740 asection
**ppsection
;
4743 output_bfd
= finfo
->output_bfd
;
4745 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4747 /* If this is a dynamic object, we don't want to do anything here:
4748 we don't want the local symbols, and we don't want the section
4750 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4753 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4754 if (elf_bad_symtab (input_bfd
))
4756 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4761 locsymcount
= symtab_hdr
->sh_info
;
4762 extsymoff
= symtab_hdr
->sh_info
;
4765 /* Read the local symbols. */
4766 if (symtab_hdr
->contents
!= NULL
)
4767 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4768 else if (locsymcount
== 0)
4769 external_syms
= NULL
;
4772 external_syms
= finfo
->external_syms
;
4773 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4774 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4775 locsymcount
, input_bfd
)
4776 != locsymcount
* sizeof (Elf_External_Sym
)))
4780 /* Swap in the local symbols and write out the ones which we know
4781 are going into the output file. */
4782 esym
= external_syms
;
4783 esymend
= esym
+ locsymcount
;
4784 isym
= finfo
->internal_syms
;
4785 pindex
= finfo
->indices
;
4786 ppsection
= finfo
->sections
;
4787 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4791 Elf_Internal_Sym osym
;
4793 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4796 if (elf_bad_symtab (input_bfd
))
4798 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4805 if (isym
->st_shndx
== SHN_UNDEF
)
4806 isec
= bfd_und_section_ptr
;
4807 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4808 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4809 else if (isym
->st_shndx
== SHN_ABS
)
4810 isec
= bfd_abs_section_ptr
;
4811 else if (isym
->st_shndx
== SHN_COMMON
)
4812 isec
= bfd_com_section_ptr
;
4821 /* Don't output the first, undefined, symbol. */
4822 if (esym
== external_syms
)
4825 /* If we are stripping all symbols, we don't want to output this
4827 if (finfo
->info
->strip
== strip_all
)
4830 /* We never output section symbols. Instead, we use the section
4831 symbol of the corresponding section in the output file. */
4832 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4835 /* If we are discarding all local symbols, we don't want to
4836 output this one. If we are generating a relocateable output
4837 file, then some of the local symbols may be required by
4838 relocs; we output them below as we discover that they are
4840 if (finfo
->info
->discard
== discard_all
)
4843 /* If this symbol is defined in a section which we are
4844 discarding, we don't need to keep it, but note that
4845 linker_mark is only reliable for sections that have contents.
4846 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4847 as well as linker_mark. */
4848 if (isym
->st_shndx
> 0
4849 && isym
->st_shndx
< SHN_LORESERVE
4851 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4852 || (! finfo
->info
->relocateable
4853 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4856 /* Get the name of the symbol. */
4857 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4862 /* See if we are discarding symbols with this name. */
4863 if ((finfo
->info
->strip
== strip_some
4864 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4866 || (finfo
->info
->discard
== discard_l
4867 && bfd_is_local_label_name (input_bfd
, name
)))
4870 /* If we get here, we are going to output this symbol. */
4874 /* Adjust the section index for the output file. */
4875 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4876 isec
->output_section
);
4877 if (osym
.st_shndx
== (unsigned short) -1)
4880 *pindex
= bfd_get_symcount (output_bfd
);
4882 /* ELF symbols in relocateable files are section relative, but
4883 in executable files they are virtual addresses. Note that
4884 this code assumes that all ELF sections have an associated
4885 BFD section with a reasonable value for output_offset; below
4886 we assume that they also have a reasonable value for
4887 output_section. Any special sections must be set up to meet
4888 these requirements. */
4889 osym
.st_value
+= isec
->output_offset
;
4890 if (! finfo
->info
->relocateable
)
4891 osym
.st_value
+= isec
->output_section
->vma
;
4893 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4897 /* Relocate the contents of each section. */
4898 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4902 if (! o
->linker_mark
)
4904 /* This section was omitted from the link. */
4908 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4909 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4912 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4914 /* Section was created by elf_link_create_dynamic_sections
4919 /* Get the contents of the section. They have been cached by a
4920 relaxation routine. Note that o is a section in an input
4921 file, so the contents field will not have been set by any of
4922 the routines which work on output files. */
4923 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4924 contents
= elf_section_data (o
)->this_hdr
.contents
;
4927 contents
= finfo
->contents
;
4928 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4929 (file_ptr
) 0, o
->_raw_size
))
4933 if ((o
->flags
& SEC_RELOC
) != 0)
4935 Elf_Internal_Rela
*internal_relocs
;
4937 /* Get the swapped relocs. */
4938 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4939 (input_bfd
, o
, finfo
->external_relocs
,
4940 finfo
->internal_relocs
, false));
4941 if (internal_relocs
== NULL
4942 && o
->reloc_count
> 0)
4945 /* Relocate the section by invoking a back end routine.
4947 The back end routine is responsible for adjusting the
4948 section contents as necessary, and (if using Rela relocs
4949 and generating a relocateable output file) adjusting the
4950 reloc addend as necessary.
4952 The back end routine does not have to worry about setting
4953 the reloc address or the reloc symbol index.
4955 The back end routine is given a pointer to the swapped in
4956 internal symbols, and can access the hash table entries
4957 for the external symbols via elf_sym_hashes (input_bfd).
4959 When generating relocateable output, the back end routine
4960 must handle STB_LOCAL/STT_SECTION symbols specially. The
4961 output symbol is going to be a section symbol
4962 corresponding to the output section, which will require
4963 the addend to be adjusted. */
4965 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4966 input_bfd
, o
, contents
,
4968 finfo
->internal_syms
,
4972 if (finfo
->info
->relocateable
)
4974 Elf_Internal_Rela
*irela
;
4975 Elf_Internal_Rela
*irelaend
;
4976 struct elf_link_hash_entry
**rel_hash
;
4977 Elf_Internal_Shdr
*input_rel_hdr
;
4978 Elf_Internal_Shdr
*output_rel_hdr
;
4980 /* Adjust the reloc addresses and symbol indices. */
4982 irela
= internal_relocs
;
4983 irelaend
= irela
+ o
->reloc_count
;
4984 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4985 + o
->output_section
->reloc_count
);
4986 for (; irela
< irelaend
; irela
++, rel_hash
++)
4988 unsigned long r_symndx
;
4989 Elf_Internal_Sym
*isym
;
4992 irela
->r_offset
+= o
->output_offset
;
4994 r_symndx
= ELF_R_SYM (irela
->r_info
);
4999 if (r_symndx
>= locsymcount
5000 || (elf_bad_symtab (input_bfd
)
5001 && finfo
->sections
[r_symndx
] == NULL
))
5003 struct elf_link_hash_entry
*rh
;
5006 /* This is a reloc against a global symbol. We
5007 have not yet output all the local symbols, so
5008 we do not know the symbol index of any global
5009 symbol. We set the rel_hash entry for this
5010 reloc to point to the global hash table entry
5011 for this symbol. The symbol index is then
5012 set at the end of elf_bfd_final_link. */
5013 indx
= r_symndx
- extsymoff
;
5014 rh
= elf_sym_hashes (input_bfd
)[indx
];
5015 while (rh
->root
.type
== bfd_link_hash_indirect
5016 || rh
->root
.type
== bfd_link_hash_warning
)
5017 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5019 /* Setting the index to -2 tells
5020 elf_link_output_extsym that this symbol is
5022 BFD_ASSERT (rh
->indx
< 0);
5030 /* This is a reloc against a local symbol. */
5033 isym
= finfo
->internal_syms
+ r_symndx
;
5034 sec
= finfo
->sections
[r_symndx
];
5035 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5037 /* I suppose the backend ought to fill in the
5038 section of any STT_SECTION symbol against a
5039 processor specific section. If we have
5040 discarded a section, the output_section will
5041 be the absolute section. */
5043 && (bfd_is_abs_section (sec
)
5044 || (sec
->output_section
!= NULL
5045 && bfd_is_abs_section (sec
->output_section
))))
5047 else if (sec
== NULL
|| sec
->owner
== NULL
)
5049 bfd_set_error (bfd_error_bad_value
);
5054 r_symndx
= sec
->output_section
->target_index
;
5055 BFD_ASSERT (r_symndx
!= 0);
5060 if (finfo
->indices
[r_symndx
] == -1)
5066 if (finfo
->info
->strip
== strip_all
)
5068 /* You can't do ld -r -s. */
5069 bfd_set_error (bfd_error_invalid_operation
);
5073 /* This symbol was skipped earlier, but
5074 since it is needed by a reloc, we
5075 must output it now. */
5076 link
= symtab_hdr
->sh_link
;
5077 name
= bfd_elf_string_from_elf_section (input_bfd
,
5083 osec
= sec
->output_section
;
5085 _bfd_elf_section_from_bfd_section (output_bfd
,
5087 if (isym
->st_shndx
== (unsigned short) -1)
5090 isym
->st_value
+= sec
->output_offset
;
5091 if (! finfo
->info
->relocateable
)
5092 isym
->st_value
+= osec
->vma
;
5094 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5096 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5100 r_symndx
= finfo
->indices
[r_symndx
];
5103 irela
->r_info
= ELF_R_INFO (r_symndx
,
5104 ELF_R_TYPE (irela
->r_info
));
5107 /* Swap out the relocs. */
5108 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5109 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
5110 BFD_ASSERT (output_rel_hdr
->sh_entsize
5111 == input_rel_hdr
->sh_entsize
);
5112 irela
= internal_relocs
;
5113 irelaend
= irela
+ o
->reloc_count
;
5114 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5116 Elf_External_Rel
*erel
;
5118 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
5119 + o
->output_section
->reloc_count
);
5120 for (; irela
< irelaend
; irela
++, erel
++)
5122 Elf_Internal_Rel irel
;
5124 irel
.r_offset
= irela
->r_offset
;
5125 irel
.r_info
= irela
->r_info
;
5126 BFD_ASSERT (irela
->r_addend
== 0);
5127 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5132 Elf_External_Rela
*erela
;
5134 BFD_ASSERT (input_rel_hdr
->sh_entsize
5135 == sizeof (Elf_External_Rela
));
5136 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
5137 + o
->output_section
->reloc_count
);
5138 for (; irela
< irelaend
; irela
++, erela
++)
5139 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5142 o
->output_section
->reloc_count
+= o
->reloc_count
;
5146 /* Write out the modified section contents. */
5147 if (elf_section_data (o
)->stab_info
== NULL
)
5149 if (! (o
->flags
& SEC_EXCLUDE
) &&
5150 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5151 contents
, o
->output_offset
,
5152 (o
->_cooked_size
!= 0
5159 if (! (_bfd_write_section_stabs
5160 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5161 o
, &elf_section_data (o
)->stab_info
, contents
)))
5169 /* Generate a reloc when linking an ELF file. This is a reloc
5170 requested by the linker, and does come from any input file. This
5171 is used to build constructor and destructor tables when linking
5175 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5177 struct bfd_link_info
*info
;
5178 asection
*output_section
;
5179 struct bfd_link_order
*link_order
;
5181 reloc_howto_type
*howto
;
5185 struct elf_link_hash_entry
**rel_hash_ptr
;
5186 Elf_Internal_Shdr
*rel_hdr
;
5188 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5191 bfd_set_error (bfd_error_bad_value
);
5195 addend
= link_order
->u
.reloc
.p
->addend
;
5197 /* Figure out the symbol index. */
5198 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5199 + output_section
->reloc_count
);
5200 if (link_order
->type
== bfd_section_reloc_link_order
)
5202 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5203 BFD_ASSERT (indx
!= 0);
5204 *rel_hash_ptr
= NULL
;
5208 struct elf_link_hash_entry
*h
;
5210 /* Treat a reloc against a defined symbol as though it were
5211 actually against the section. */
5212 h
= ((struct elf_link_hash_entry
*)
5213 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5214 link_order
->u
.reloc
.p
->u
.name
,
5215 false, false, true));
5217 && (h
->root
.type
== bfd_link_hash_defined
5218 || h
->root
.type
== bfd_link_hash_defweak
))
5222 section
= h
->root
.u
.def
.section
;
5223 indx
= section
->output_section
->target_index
;
5224 *rel_hash_ptr
= NULL
;
5225 /* It seems that we ought to add the symbol value to the
5226 addend here, but in practice it has already been added
5227 because it was passed to constructor_callback. */
5228 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5232 /* Setting the index to -2 tells elf_link_output_extsym that
5233 this symbol is used by a reloc. */
5240 if (! ((*info
->callbacks
->unattached_reloc
)
5241 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5242 (asection
*) NULL
, (bfd_vma
) 0)))
5248 /* If this is an inplace reloc, we must write the addend into the
5250 if (howto
->partial_inplace
&& addend
!= 0)
5253 bfd_reloc_status_type rstat
;
5257 size
= bfd_get_reloc_size (howto
);
5258 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5259 if (buf
== (bfd_byte
*) NULL
)
5261 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5267 case bfd_reloc_outofrange
:
5269 case bfd_reloc_overflow
:
5270 if (! ((*info
->callbacks
->reloc_overflow
)
5272 (link_order
->type
== bfd_section_reloc_link_order
5273 ? bfd_section_name (output_bfd
,
5274 link_order
->u
.reloc
.p
->u
.section
)
5275 : link_order
->u
.reloc
.p
->u
.name
),
5276 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5284 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5285 (file_ptr
) link_order
->offset
, size
);
5291 /* The address of a reloc is relative to the section in a
5292 relocateable file, and is a virtual address in an executable
5294 offset
= link_order
->offset
;
5295 if (! info
->relocateable
)
5296 offset
+= output_section
->vma
;
5298 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5300 if (rel_hdr
->sh_type
== SHT_REL
)
5302 Elf_Internal_Rel irel
;
5303 Elf_External_Rel
*erel
;
5305 irel
.r_offset
= offset
;
5306 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5307 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5308 + output_section
->reloc_count
);
5309 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5313 Elf_Internal_Rela irela
;
5314 Elf_External_Rela
*erela
;
5316 irela
.r_offset
= offset
;
5317 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5318 irela
.r_addend
= addend
;
5319 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5320 + output_section
->reloc_count
);
5321 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5324 ++output_section
->reloc_count
;
5330 /* Allocate a pointer to live in a linker created section. */
5333 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5335 struct bfd_link_info
*info
;
5336 elf_linker_section_t
*lsect
;
5337 struct elf_link_hash_entry
*h
;
5338 const Elf_Internal_Rela
*rel
;
5340 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5341 elf_linker_section_pointers_t
*linker_section_ptr
;
5342 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5344 BFD_ASSERT (lsect
!= NULL
);
5346 /* Is this a global symbol? */
5349 /* Has this symbol already been allocated, if so, our work is done */
5350 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5355 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5356 /* Make sure this symbol is output as a dynamic symbol. */
5357 if (h
->dynindx
== -1)
5359 if (! elf_link_record_dynamic_symbol (info
, h
))
5363 if (lsect
->rel_section
)
5364 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5367 else /* Allocation of a pointer to a local symbol */
5369 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5371 /* Allocate a table to hold the local symbols if first time */
5374 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5375 register unsigned int i
;
5377 ptr
= (elf_linker_section_pointers_t
**)
5378 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5383 elf_local_ptr_offsets (abfd
) = ptr
;
5384 for (i
= 0; i
< num_symbols
; i
++)
5385 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5388 /* Has this symbol already been allocated, if so, our work is done */
5389 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5394 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5398 /* If we are generating a shared object, we need to
5399 output a R_<xxx>_RELATIVE reloc so that the
5400 dynamic linker can adjust this GOT entry. */
5401 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5402 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5406 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5407 from internal memory. */
5408 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5409 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5410 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5412 if (!linker_section_ptr
)
5415 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5416 linker_section_ptr
->addend
= rel
->r_addend
;
5417 linker_section_ptr
->which
= lsect
->which
;
5418 linker_section_ptr
->written_address_p
= false;
5419 *ptr_linker_section_ptr
= linker_section_ptr
;
5422 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5424 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5425 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5426 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5427 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5429 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5431 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5432 lsect
->sym_hash
->root
.root
.string
,
5433 (long)ARCH_SIZE
/ 8,
5434 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5440 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5442 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5445 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5446 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5454 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5457 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5460 /* Fill in the address for a pointer generated in alinker section. */
5463 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5466 struct bfd_link_info
*info
;
5467 elf_linker_section_t
*lsect
;
5468 struct elf_link_hash_entry
*h
;
5470 const Elf_Internal_Rela
*rel
;
5473 elf_linker_section_pointers_t
*linker_section_ptr
;
5475 BFD_ASSERT (lsect
!= NULL
);
5477 if (h
!= NULL
) /* global symbol */
5479 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5483 BFD_ASSERT (linker_section_ptr
!= NULL
);
5485 if (! elf_hash_table (info
)->dynamic_sections_created
5488 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5490 /* This is actually a static link, or it is a
5491 -Bsymbolic link and the symbol is defined
5492 locally. We must initialize this entry in the
5495 When doing a dynamic link, we create a .rela.<xxx>
5496 relocation entry to initialize the value. This
5497 is done in the finish_dynamic_symbol routine. */
5498 if (!linker_section_ptr
->written_address_p
)
5500 linker_section_ptr
->written_address_p
= true;
5501 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5502 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5506 else /* local symbol */
5508 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5509 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5510 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5511 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5515 BFD_ASSERT (linker_section_ptr
!= NULL
);
5517 /* Write out pointer if it hasn't been rewritten out before */
5518 if (!linker_section_ptr
->written_address_p
)
5520 linker_section_ptr
->written_address_p
= true;
5521 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5522 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5526 asection
*srel
= lsect
->rel_section
;
5527 Elf_Internal_Rela outrel
;
5529 /* We need to generate a relative reloc for the dynamic linker. */
5531 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5534 BFD_ASSERT (srel
!= NULL
);
5536 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5537 + lsect
->section
->output_offset
5538 + linker_section_ptr
->offset
);
5539 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5540 outrel
.r_addend
= 0;
5541 elf_swap_reloca_out (output_bfd
, &outrel
,
5542 (((Elf_External_Rela
*)
5543 lsect
->section
->contents
)
5544 + lsect
->section
->reloc_count
));
5545 ++lsect
->section
->reloc_count
;
5550 relocation
= (lsect
->section
->output_offset
5551 + linker_section_ptr
->offset
5552 - lsect
->hole_offset
5553 - lsect
->sym_offset
);
5556 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5557 lsect
->name
, (long)relocation
, (long)relocation
);
5560 /* Subtract out the addend, because it will get added back in by the normal
5562 return relocation
- linker_section_ptr
->addend
;
5565 /* Garbage collect unused sections. */
5567 static boolean elf_gc_mark
5568 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5569 asection
* (*gc_mark_hook
)
5570 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5571 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5573 static boolean elf_gc_sweep
5574 PARAMS ((struct bfd_link_info
*info
,
5575 boolean (*gc_sweep_hook
)
5576 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5577 const Elf_Internal_Rela
*relocs
))));
5579 static boolean elf_gc_sweep_symbol
5580 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5582 static boolean elf_gc_allocate_got_offsets
5583 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5585 static boolean elf_gc_propagate_vtable_entries_used
5586 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5588 static boolean elf_gc_smash_unused_vtentry_relocs
5589 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5591 /* The mark phase of garbage collection. For a given section, mark
5592 it, and all the sections which define symbols to which it refers. */
5595 elf_gc_mark (info
, sec
, gc_mark_hook
)
5596 struct bfd_link_info
*info
;
5598 asection
* (*gc_mark_hook
)
5599 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5600 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
5606 /* Look through the section relocs. */
5608 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
5610 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
5611 Elf_Internal_Shdr
*symtab_hdr
;
5612 struct elf_link_hash_entry
**sym_hashes
;
5615 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
5616 bfd
*input_bfd
= sec
->owner
;
5618 /* GCFIXME: how to arrange so that relocs and symbols are not
5619 reread continually? */
5621 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5622 sym_hashes
= elf_sym_hashes (input_bfd
);
5624 /* Read the local symbols. */
5625 if (elf_bad_symtab (input_bfd
))
5627 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5631 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
5632 if (symtab_hdr
->contents
)
5633 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5634 else if (nlocsyms
== 0)
5638 locsyms
= freesyms
=
5639 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
5640 if (freesyms
== NULL
5641 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5642 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
5643 nlocsyms
, input_bfd
)
5644 != nlocsyms
* sizeof (Elf_External_Sym
)))
5651 /* Read the relocations. */
5652 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5653 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
5654 info
->keep_memory
));
5655 if (relstart
== NULL
)
5660 relend
= relstart
+ sec
->reloc_count
;
5662 for (rel
= relstart
; rel
< relend
; rel
++)
5664 unsigned long r_symndx
;
5666 struct elf_link_hash_entry
*h
;
5669 r_symndx
= ELF_R_SYM (rel
->r_info
);
5673 if (elf_bad_symtab (sec
->owner
))
5675 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5676 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
5677 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5680 h
= sym_hashes
[r_symndx
- extsymoff
];
5681 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5684 else if (r_symndx
>= nlocsyms
)
5686 h
= sym_hashes
[r_symndx
- extsymoff
];
5687 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5691 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5692 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5695 if (rsec
&& !rsec
->gc_mark
)
5696 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
5704 if (!info
->keep_memory
)
5714 /* The sweep phase of garbage collection. Remove all garbage sections. */
5717 elf_gc_sweep (info
, gc_sweep_hook
)
5718 struct bfd_link_info
*info
;
5719 boolean (*gc_sweep_hook
)
5720 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5721 const Elf_Internal_Rela
*relocs
));
5725 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5729 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5731 /* Keep special sections. Keep .debug sections. */
5732 if ((o
->flags
& SEC_LINKER_CREATED
)
5733 || (o
->flags
& SEC_DEBUGGING
))
5739 /* Skip sweeping sections already excluded. */
5740 if (o
->flags
& SEC_EXCLUDE
)
5743 /* Since this is early in the link process, it is simple
5744 to remove a section from the output. */
5745 o
->flags
|= SEC_EXCLUDE
;
5747 /* But we also have to update some of the relocation
5748 info we collected before. */
5750 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
5752 Elf_Internal_Rela
*internal_relocs
;
5755 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5756 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
5757 if (internal_relocs
== NULL
)
5760 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
5762 if (!info
->keep_memory
)
5763 free (internal_relocs
);
5771 /* Remove the symbols that were in the swept sections from the dynamic
5772 symbol table. GCFIXME: Anyone know how to get them out of the
5773 static symbol table as well? */
5777 elf_link_hash_traverse (elf_hash_table (info
),
5778 elf_gc_sweep_symbol
,
5781 elf_hash_table (info
)->dynsymcount
= i
;
5787 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
5790 elf_gc_sweep_symbol (h
, idxptr
)
5791 struct elf_link_hash_entry
*h
;
5794 int *idx
= (int *) idxptr
;
5796 if (h
->dynindx
!= -1
5797 && ((h
->root
.type
!= bfd_link_hash_defined
5798 && h
->root
.type
!= bfd_link_hash_defweak
)
5799 || h
->root
.u
.def
.section
->gc_mark
))
5800 h
->dynindx
= (*idx
)++;
5805 /* Propogate collected vtable information. This is called through
5806 elf_link_hash_traverse. */
5809 elf_gc_propagate_vtable_entries_used (h
, okp
)
5810 struct elf_link_hash_entry
*h
;
5813 /* Those that are not vtables. */
5814 if (h
->vtable_parent
== NULL
)
5817 /* Those vtables that do not have parents, we cannot merge. */
5818 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
5821 /* If we've already been done, exit. */
5822 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
5825 /* Make sure the parent's table is up to date. */
5826 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
5828 if (h
->vtable_entries_used
== NULL
)
5830 /* None of this table's entries were referenced. Re-use the
5832 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
5833 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
5840 /* Or the parent's entries into ours. */
5841 cu
= h
->vtable_entries_used
;
5843 pu
= h
->vtable_parent
->vtable_entries_used
;
5846 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
5849 if (*pu
) *cu
= true;
5859 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
5860 struct elf_link_hash_entry
*h
;
5864 bfd_vma hstart
, hend
;
5865 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
5867 /* Take care of both those symbols that do not describe vtables as
5868 well as those that are not loaded. */
5869 if (h
->vtable_parent
== NULL
)
5872 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5873 || h
->root
.type
== bfd_link_hash_defweak
);
5875 sec
= h
->root
.u
.def
.section
;
5876 hstart
= h
->root
.u
.def
.value
;
5877 hend
= hstart
+ h
->size
;
5879 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5880 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
5882 return *(boolean
*)okp
= false;
5883 relend
= relstart
+ sec
->reloc_count
;
5885 for (rel
= relstart
; rel
< relend
; ++rel
)
5886 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
5888 /* If the entry is in use, do nothing. */
5889 if (h
->vtable_entries_used
5890 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
5892 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
5893 if (h
->vtable_entries_used
[entry
])
5896 /* Otherwise, kill it. */
5897 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
5903 /* Do mark and sweep of unused sections. */
5906 elf_gc_sections (abfd
, info
)
5908 struct bfd_link_info
*info
;
5912 asection
* (*gc_mark_hook
)
5913 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
5914 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
5916 if (!get_elf_backend_data (abfd
)->can_gc_sections
5917 || info
->relocateable
5918 || elf_hash_table (info
)->dynamic_sections_created
)
5921 /* Apply transitive closure to the vtable entry usage info. */
5922 elf_link_hash_traverse (elf_hash_table (info
),
5923 elf_gc_propagate_vtable_entries_used
,
5928 /* Kill the vtable relocations that were not used. */
5929 elf_link_hash_traverse (elf_hash_table (info
),
5930 elf_gc_smash_unused_vtentry_relocs
,
5935 /* Grovel through relocs to find out who stays ... */
5937 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
5938 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5941 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5943 if (o
->flags
& SEC_KEEP
)
5944 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
5949 /* ... and mark SEC_EXCLUDE for those that go. */
5950 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
5956 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
5959 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
5962 struct elf_link_hash_entry
*h
;
5965 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
5966 struct elf_link_hash_entry
**search
, *child
;
5967 bfd_size_type extsymcount
;
5969 /* The sh_info field of the symtab header tells us where the
5970 external symbols start. We don't care about the local symbols at
5972 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
5973 if (!elf_bad_symtab (abfd
))
5974 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5976 sym_hashes
= elf_sym_hashes (abfd
);
5977 sym_hashes_end
= sym_hashes
+ extsymcount
;
5979 /* Hunt down the child symbol, which is in this section at the same
5980 offset as the relocation. */
5981 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
5983 if ((child
= *search
) != NULL
5984 && (child
->root
.type
== bfd_link_hash_defined
5985 || child
->root
.type
== bfd_link_hash_defweak
)
5986 && child
->root
.u
.def
.section
== sec
5987 && child
->root
.u
.def
.value
== offset
)
5991 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
5992 bfd_get_filename (abfd
), sec
->name
,
5993 (unsigned long)offset
);
5994 bfd_set_error (bfd_error_invalid_operation
);
6000 /* This *should* only be the absolute section. It could potentially
6001 be that someone has defined a non-global vtable though, which
6002 would be bad. It isn't worth paging in the local symbols to be
6003 sure though; that case should simply be handled by the assembler. */
6005 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6008 child
->vtable_parent
= h
;
6013 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6016 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6019 struct elf_link_hash_entry
*h
;
6022 if (addend
>= h
->vtable_entries_size
)
6025 boolean
*ptr
= h
->vtable_entries_used
;
6027 /* While the symbol is undefined, we have to be prepared to handle
6029 if (h
->root
.type
== bfd_link_hash_undefined
)
6036 /* Oops! We've got a reference past the defined end of
6037 the table. This is probably a bug -- shall we warn? */
6042 /* Allocate one extra entry for use as a "done" flag for the
6043 consolidation pass. */
6044 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof(boolean
);
6050 ptr
= realloc (ptr
-1, bytes
);
6054 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof(boolean
);
6055 memset (ptr
+ oldbytes
, 0, bytes
- oldbytes
);
6059 ptr
= calloc (1, bytes
);
6064 /* And arrange for that done flag to be at index -1. */
6065 h
->vtable_entries_used
= ptr
+1;
6066 h
->vtable_entries_size
= size
;
6068 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6073 /* And an accompanying bit to work out final got entry offsets once
6074 we're done. Should be called from final_link. */
6077 elf_gc_common_finalize_got_offsets (abfd
, info
)
6079 struct bfd_link_info
*info
;
6082 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6085 /* The GOT offset is relative to the .got section, but the GOT header is
6086 put into the .got.plt section, if the backend uses it. */
6087 if (bed
->want_got_plt
)
6090 gotoff
= bed
->got_header_size
;
6092 /* Do the local .got entries first. */
6093 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6095 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
6096 bfd_size_type j
, locsymcount
;
6097 Elf_Internal_Shdr
*symtab_hdr
;
6102 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6103 if (elf_bad_symtab (i
))
6104 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6106 locsymcount
= symtab_hdr
->sh_info
;
6108 for (j
= 0; j
< locsymcount
; ++j
)
6110 if (local_got
[j
] > 0)
6112 local_got
[j
] = gotoff
;
6113 gotoff
+= ARCH_SIZE
/ 8;
6116 local_got
[j
] = (bfd_vma
) -1;
6120 /* Then the global .got and .plt entries. */
6121 elf_link_hash_traverse (elf_hash_table (info
),
6122 elf_gc_allocate_got_offsets
,
6127 /* We need a special top-level link routine to convert got reference counts
6128 to real got offsets. */
6131 elf_gc_allocate_got_offsets (h
, offarg
)
6132 struct elf_link_hash_entry
*h
;
6135 bfd_vma
*off
= (bfd_vma
*) offarg
;
6137 if (h
->got
.refcount
> 0)
6139 h
->got
.offset
= off
[0];
6140 off
[0] += ARCH_SIZE
/ 8;
6143 h
->got
.offset
= (bfd_vma
) -1;
6148 /* Many folk need no more in the way of final link than this, once
6149 got entry reference counting is enabled. */
6152 elf_gc_common_final_link (abfd
, info
)
6154 struct bfd_link_info
*info
;
6156 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6159 /* Invoke the regular ELF backend linker to do all the work. */
6160 return elf_bfd_final_link (abfd
, info
);
6163 /* This function will be called though elf_link_hash_traverse to store
6164 all hash value of the exported symbols in an array. */
6167 elf_collect_hash_codes (h
, data
)
6168 struct elf_link_hash_entry
*h
;
6171 unsigned long **valuep
= (unsigned long **) data
;
6177 /* Ignore indirect symbols. These are added by the versioning code. */
6178 if (h
->dynindx
== -1)
6181 name
= h
->root
.root
.string
;
6182 p
= strchr (name
, ELF_VER_CHR
);
6185 alc
= bfd_malloc (p
- name
+ 1);
6186 memcpy (alc
, name
, p
- name
);
6187 alc
[p
- name
] = '\0';
6191 /* Compute the hash value. */
6192 ha
= bfd_elf_hash (name
);
6194 /* Store the found hash value in the array given as the argument. */
6197 /* And store it in the struct so that we can put it in the hash table
6199 h
->elf_hash_value
= ha
;