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_collect_hash_codes
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
53 static boolean elf_link_read_relocs_from_section
54 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
55 static void elf_link_output_relocs
56 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
57 static boolean elf_link_size_reloc_section
58 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
59 static void elf_link_adjust_relocs
60 PARAMS ((bfd
*, Elf_Internal_Shdr
*, unsigned int,
61 struct elf_link_hash_entry
**));
63 /* Given an ELF BFD, add symbols to the global hash table as
67 elf_bfd_link_add_symbols (abfd
, info
)
69 struct bfd_link_info
*info
;
71 switch (bfd_get_format (abfd
))
74 return elf_link_add_object_symbols (abfd
, info
);
76 return elf_link_add_archive_symbols (abfd
, info
);
78 bfd_set_error (bfd_error_wrong_format
);
84 /* Add symbols from an ELF archive file to the linker hash table. We
85 don't use _bfd_generic_link_add_archive_symbols because of a
86 problem which arises on UnixWare. The UnixWare libc.so is an
87 archive which includes an entry libc.so.1 which defines a bunch of
88 symbols. The libc.so archive also includes a number of other
89 object files, which also define symbols, some of which are the same
90 as those defined in libc.so.1. Correct linking requires that we
91 consider each object file in turn, and include it if it defines any
92 symbols we need. _bfd_generic_link_add_archive_symbols does not do
93 this; it looks through the list of undefined symbols, and includes
94 any object file which defines them. When this algorithm is used on
95 UnixWare, it winds up pulling in libc.so.1 early and defining a
96 bunch of symbols. This means that some of the other objects in the
97 archive are not included in the link, which is incorrect since they
98 precede libc.so.1 in the archive.
100 Fortunately, ELF archive handling is simpler than that done by
101 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
102 oddities. In ELF, if we find a symbol in the archive map, and the
103 symbol is currently undefined, we know that we must pull in that
106 Unfortunately, we do have to make multiple passes over the symbol
107 table until nothing further is resolved. */
110 elf_link_add_archive_symbols (abfd
, info
)
112 struct bfd_link_info
*info
;
115 boolean
*defined
= NULL
;
116 boolean
*included
= NULL
;
120 if (! bfd_has_map (abfd
))
122 /* An empty archive is a special case. */
123 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
125 bfd_set_error (bfd_error_no_armap
);
129 /* Keep track of all symbols we know to be already defined, and all
130 files we know to be already included. This is to speed up the
131 second and subsequent passes. */
132 c
= bfd_ardata (abfd
)->symdef_count
;
135 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
136 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
137 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
139 memset (defined
, 0, c
* sizeof (boolean
));
140 memset (included
, 0, c
* sizeof (boolean
));
142 symdefs
= bfd_ardata (abfd
)->symdefs
;
155 symdefend
= symdef
+ c
;
156 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
158 struct elf_link_hash_entry
*h
;
160 struct bfd_link_hash_entry
*undefs_tail
;
163 if (defined
[i
] || included
[i
])
165 if (symdef
->file_offset
== last
)
171 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
172 false, false, false);
178 /* If this is a default version (the name contains @@),
179 look up the symbol again without the version. The
180 effect is that references to the symbol without the
181 version will be matched by the default symbol in the
184 p
= strchr (symdef
->name
, ELF_VER_CHR
);
185 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
188 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
191 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
192 copy
[p
- symdef
->name
] = '\0';
194 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
195 false, false, false);
197 bfd_release (abfd
, copy
);
203 if (h
->root
.type
!= bfd_link_hash_undefined
)
205 if (h
->root
.type
!= bfd_link_hash_undefweak
)
210 /* We need to include this archive member. */
212 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
213 if (element
== (bfd
*) NULL
)
216 if (! bfd_check_format (element
, bfd_object
))
219 /* Doublecheck that we have not included this object
220 already--it should be impossible, but there may be
221 something wrong with the archive. */
222 if (element
->archive_pass
!= 0)
224 bfd_set_error (bfd_error_bad_value
);
227 element
->archive_pass
= 1;
229 undefs_tail
= info
->hash
->undefs_tail
;
231 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
234 if (! elf_link_add_object_symbols (element
, info
))
237 /* If there are any new undefined symbols, we need to make
238 another pass through the archive in order to see whether
239 they can be defined. FIXME: This isn't perfect, because
240 common symbols wind up on undefs_tail and because an
241 undefined symbol which is defined later on in this pass
242 does not require another pass. This isn't a bug, but it
243 does make the code less efficient than it could be. */
244 if (undefs_tail
!= info
->hash
->undefs_tail
)
247 /* Look backward to mark all symbols from this object file
248 which we have already seen in this pass. */
252 included
[mark
] = true;
257 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
259 /* We mark subsequent symbols from this object file as we go
260 on through the loop. */
261 last
= symdef
->file_offset
;
272 if (defined
!= (boolean
*) NULL
)
274 if (included
!= (boolean
*) NULL
)
279 /* This function is called when we want to define a new symbol. It
280 handles the various cases which arise when we find a definition in
281 a dynamic object, or when there is already a definition in a
282 dynamic object. The new symbol is described by NAME, SYM, PSEC,
283 and PVALUE. We set SYM_HASH to the hash table entry. We set
284 OVERRIDE if the old symbol is overriding a new definition. We set
285 TYPE_CHANGE_OK if it is OK for the type to change. We set
286 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
287 change, we mean that we shouldn't warn if the type or size does
291 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
292 override
, type_change_ok
, size_change_ok
)
294 struct bfd_link_info
*info
;
296 Elf_Internal_Sym
*sym
;
299 struct elf_link_hash_entry
**sym_hash
;
301 boolean
*type_change_ok
;
302 boolean
*size_change_ok
;
305 struct elf_link_hash_entry
*h
;
308 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
313 bind
= ELF_ST_BIND (sym
->st_info
);
315 if (! bfd_is_und_section (sec
))
316 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
318 h
= ((struct elf_link_hash_entry
*)
319 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
324 /* This code is for coping with dynamic objects, and is only useful
325 if we are doing an ELF link. */
326 if (info
->hash
->creator
!= abfd
->xvec
)
329 /* For merging, we only care about real symbols. */
331 while (h
->root
.type
== bfd_link_hash_indirect
332 || h
->root
.type
== bfd_link_hash_warning
)
333 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
335 /* If we just created the symbol, mark it as being an ELF symbol.
336 Other than that, there is nothing to do--there is no merge issue
337 with a newly defined symbol--so we just return. */
339 if (h
->root
.type
== bfd_link_hash_new
)
341 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
345 /* OLDBFD is a BFD associated with the existing symbol. */
347 switch (h
->root
.type
)
353 case bfd_link_hash_undefined
:
354 case bfd_link_hash_undefweak
:
355 oldbfd
= h
->root
.u
.undef
.abfd
;
358 case bfd_link_hash_defined
:
359 case bfd_link_hash_defweak
:
360 oldbfd
= h
->root
.u
.def
.section
->owner
;
363 case bfd_link_hash_common
:
364 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
368 /* In cases involving weak versioned symbols, we may wind up trying
369 to merge a symbol with itself. Catch that here, to avoid the
370 confusion that results if we try to override a symbol with
371 itself. The additional tests catch cases like
372 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
373 dynamic object, which we do want to handle here. */
375 && ((abfd
->flags
& DYNAMIC
) == 0
376 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
379 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
380 respectively, is from a dynamic object. */
382 if ((abfd
->flags
& DYNAMIC
) != 0)
387 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
392 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
393 respectively, appear to be a definition rather than reference. */
395 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
400 if (h
->root
.type
== bfd_link_hash_undefined
401 || h
->root
.type
== bfd_link_hash_undefweak
402 || h
->root
.type
== bfd_link_hash_common
)
407 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
408 symbol, respectively, appears to be a common symbol in a dynamic
409 object. If a symbol appears in an uninitialized section, and is
410 not weak, and is not a function, then it may be a common symbol
411 which was resolved when the dynamic object was created. We want
412 to treat such symbols specially, because they raise special
413 considerations when setting the symbol size: if the symbol
414 appears as a common symbol in a regular object, and the size in
415 the regular object is larger, we must make sure that we use the
416 larger size. This problematic case can always be avoided in C,
417 but it must be handled correctly when using Fortran shared
420 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
421 likewise for OLDDYNCOMMON and OLDDEF.
423 Note that this test is just a heuristic, and that it is quite
424 possible to have an uninitialized symbol in a shared object which
425 is really a definition, rather than a common symbol. This could
426 lead to some minor confusion when the symbol really is a common
427 symbol in some regular object. However, I think it will be
432 && (sec
->flags
& SEC_ALLOC
) != 0
433 && (sec
->flags
& SEC_LOAD
) == 0
436 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
439 newdyncommon
= false;
443 && h
->root
.type
== bfd_link_hash_defined
444 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
445 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
446 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
448 && h
->type
!= STT_FUNC
)
451 olddyncommon
= false;
453 /* It's OK to change the type if either the existing symbol or the
454 new symbol is weak. */
456 if (h
->root
.type
== bfd_link_hash_defweak
457 || h
->root
.type
== bfd_link_hash_undefweak
459 *type_change_ok
= true;
461 /* It's OK to change the size if either the existing symbol or the
462 new symbol is weak, or if the old symbol is undefined. */
465 || h
->root
.type
== bfd_link_hash_undefined
)
466 *size_change_ok
= true;
468 /* If both the old and the new symbols look like common symbols in a
469 dynamic object, set the size of the symbol to the larger of the
474 && sym
->st_size
!= h
->size
)
476 /* Since we think we have two common symbols, issue a multiple
477 common warning if desired. Note that we only warn if the
478 size is different. If the size is the same, we simply let
479 the old symbol override the new one as normally happens with
480 symbols defined in dynamic objects. */
482 if (! ((*info
->callbacks
->multiple_common
)
483 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
484 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
487 if (sym
->st_size
> h
->size
)
488 h
->size
= sym
->st_size
;
490 *size_change_ok
= true;
493 /* If we are looking at a dynamic object, and we have found a
494 definition, we need to see if the symbol was already defined by
495 some other object. If so, we want to use the existing
496 definition, and we do not want to report a multiple symbol
497 definition error; we do this by clobbering *PSEC to be
500 We treat a common symbol as a definition if the symbol in the
501 shared library is a function, since common symbols always
502 represent variables; this can cause confusion in principle, but
503 any such confusion would seem to indicate an erroneous program or
504 shared library. We also permit a common symbol in a regular
505 object to override a weak symbol in a shared object.
507 We prefer a non-weak definition in a shared library to a weak
508 definition in the executable. */
513 || (h
->root
.type
== bfd_link_hash_common
515 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
516 && (h
->root
.type
!= bfd_link_hash_defweak
517 || bind
== STB_WEAK
))
521 newdyncommon
= false;
523 *psec
= sec
= bfd_und_section_ptr
;
524 *size_change_ok
= true;
526 /* If we get here when the old symbol is a common symbol, then
527 we are explicitly letting it override a weak symbol or
528 function in a dynamic object, and we don't want to warn about
529 a type change. If the old symbol is a defined symbol, a type
530 change warning may still be appropriate. */
532 if (h
->root
.type
== bfd_link_hash_common
)
533 *type_change_ok
= true;
536 /* Handle the special case of an old common symbol merging with a
537 new symbol which looks like a common symbol in a shared object.
538 We change *PSEC and *PVALUE to make the new symbol look like a
539 common symbol, and let _bfd_generic_link_add_one_symbol will do
543 && h
->root
.type
== bfd_link_hash_common
)
547 newdyncommon
= false;
548 *pvalue
= sym
->st_size
;
549 *psec
= sec
= bfd_com_section_ptr
;
550 *size_change_ok
= true;
553 /* If the old symbol is from a dynamic object, and the new symbol is
554 a definition which is not from a dynamic object, then the new
555 symbol overrides the old symbol. Symbols from regular files
556 always take precedence over symbols from dynamic objects, even if
557 they are defined after the dynamic object in the link.
559 As above, we again permit a common symbol in a regular object to
560 override a definition in a shared object if the shared object
561 symbol is a function or is weak.
563 As above, we permit a non-weak definition in a shared object to
564 override a weak definition in a regular object. */
568 || (bfd_is_com_section (sec
)
569 && (h
->root
.type
== bfd_link_hash_defweak
570 || h
->type
== STT_FUNC
)))
573 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
575 || h
->root
.type
== bfd_link_hash_defweak
))
577 /* Change the hash table entry to undefined, and let
578 _bfd_generic_link_add_one_symbol do the right thing with the
581 h
->root
.type
= bfd_link_hash_undefined
;
582 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
583 *size_change_ok
= true;
586 olddyncommon
= false;
588 /* We again permit a type change when a common symbol may be
589 overriding a function. */
591 if (bfd_is_com_section (sec
))
592 *type_change_ok
= true;
594 /* This union may have been set to be non-NULL when this symbol
595 was seen in a dynamic object. We must force the union to be
596 NULL, so that it is correct for a regular symbol. */
598 h
->verinfo
.vertree
= NULL
;
600 /* In this special case, if H is the target of an indirection,
601 we want the caller to frob with H rather than with the
602 indirect symbol. That will permit the caller to redefine the
603 target of the indirection, rather than the indirect symbol
604 itself. FIXME: This will break the -y option if we store a
605 symbol with a different name. */
609 /* Handle the special case of a new common symbol merging with an
610 old symbol that looks like it might be a common symbol defined in
611 a shared object. Note that we have already handled the case in
612 which a new common symbol should simply override the definition
613 in the shared library. */
616 && bfd_is_com_section (sec
)
619 /* It would be best if we could set the hash table entry to a
620 common symbol, but we don't know what to use for the section
622 if (! ((*info
->callbacks
->multiple_common
)
623 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
624 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
627 /* If the predumed common symbol in the dynamic object is
628 larger, pretend that the new symbol has its size. */
630 if (h
->size
> *pvalue
)
633 /* FIXME: We no longer know the alignment required by the symbol
634 in the dynamic object, so we just wind up using the one from
635 the regular object. */
638 olddyncommon
= false;
640 h
->root
.type
= bfd_link_hash_undefined
;
641 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
643 *size_change_ok
= true;
644 *type_change_ok
= true;
646 h
->verinfo
.vertree
= NULL
;
649 /* Handle the special case of a weak definition in a regular object
650 followed by a non-weak definition in a shared object. In this
651 case, we prefer the definition in the shared object. */
653 && h
->root
.type
== bfd_link_hash_defweak
658 /* To make this work we have to frob the flags so that the rest
659 of the code does not think we are using the regular
661 h
->elf_link_hash_flags
&= ~ ELF_LINK_HASH_DEF_REGULAR
;
662 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
664 /* If H is the target of an indirection, we want the caller to
665 use H rather than the indirect symbol. Otherwise if we are
666 defining a new indirect symbol we will wind up attaching it
667 to the entry we are overriding. */
671 /* Handle the special case of a non-weak definition in a shared
672 object followed by a weak definition in a regular object. In
673 this case we prefer to definition in the shared object. To make
674 this work we have to tell the caller to not treat the new symbol
678 && h
->root
.type
!= bfd_link_hash_defweak
687 /* Add symbols from an ELF object file to the linker hash table. */
690 elf_link_add_object_symbols (abfd
, info
)
692 struct bfd_link_info
*info
;
694 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
695 const Elf_Internal_Sym
*,
696 const char **, flagword
*,
697 asection
**, bfd_vma
*));
698 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
699 asection
*, const Elf_Internal_Rela
*));
701 Elf_Internal_Shdr
*hdr
;
705 Elf_External_Sym
*buf
= NULL
;
706 struct elf_link_hash_entry
**sym_hash
;
708 bfd_byte
*dynver
= NULL
;
709 Elf_External_Versym
*extversym
= NULL
;
710 Elf_External_Versym
*ever
;
711 Elf_External_Dyn
*dynbuf
= NULL
;
712 struct elf_link_hash_entry
*weaks
;
713 Elf_External_Sym
*esym
;
714 Elf_External_Sym
*esymend
;
716 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
717 collect
= get_elf_backend_data (abfd
)->collect
;
719 if ((abfd
->flags
& DYNAMIC
) == 0)
725 /* You can't use -r against a dynamic object. Also, there's no
726 hope of using a dynamic object which does not exactly match
727 the format of the output file. */
728 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
730 bfd_set_error (bfd_error_invalid_operation
);
735 /* As a GNU extension, any input sections which are named
736 .gnu.warning.SYMBOL are treated as warning symbols for the given
737 symbol. This differs from .gnu.warning sections, which generate
738 warnings when they are included in an output file. */
743 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
747 name
= bfd_get_section_name (abfd
, s
);
748 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
753 name
+= sizeof ".gnu.warning." - 1;
755 /* If this is a shared object, then look up the symbol
756 in the hash table. If it is there, and it is already
757 been defined, then we will not be using the entry
758 from this shared object, so we don't need to warn.
759 FIXME: If we see the definition in a regular object
760 later on, we will warn, but we shouldn't. The only
761 fix is to keep track of what warnings we are supposed
762 to emit, and then handle them all at the end of the
764 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
766 struct elf_link_hash_entry
*h
;
768 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
771 /* FIXME: What about bfd_link_hash_common? */
773 && (h
->root
.type
== bfd_link_hash_defined
774 || h
->root
.type
== bfd_link_hash_defweak
))
776 /* We don't want to issue this warning. Clobber
777 the section size so that the warning does not
778 get copied into the output file. */
784 sz
= bfd_section_size (abfd
, s
);
785 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
789 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
794 if (! (_bfd_generic_link_add_one_symbol
795 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
796 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
799 if (! info
->relocateable
)
801 /* Clobber the section size so that the warning does
802 not get copied into the output file. */
809 /* If this is a dynamic object, we always link against the .dynsym
810 symbol table, not the .symtab symbol table. The dynamic linker
811 will only see the .dynsym symbol table, so there is no reason to
812 look at .symtab for a dynamic object. */
814 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
815 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
817 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
821 /* Read in any version definitions. */
823 if (! _bfd_elf_slurp_version_tables (abfd
))
826 /* Read in the symbol versions, but don't bother to convert them
827 to internal format. */
828 if (elf_dynversym (abfd
) != 0)
830 Elf_Internal_Shdr
*versymhdr
;
832 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
833 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
834 if (extversym
== NULL
)
836 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
837 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
838 != versymhdr
->sh_size
))
843 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
845 /* The sh_info field of the symtab header tells us where the
846 external symbols start. We don't care about the local symbols at
848 if (elf_bad_symtab (abfd
))
850 extsymcount
= symcount
;
855 extsymcount
= symcount
- hdr
->sh_info
;
856 extsymoff
= hdr
->sh_info
;
859 buf
= ((Elf_External_Sym
*)
860 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
861 if (buf
== NULL
&& extsymcount
!= 0)
864 /* We store a pointer to the hash table entry for each external
866 sym_hash
= ((struct elf_link_hash_entry
**)
868 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
869 if (sym_hash
== NULL
)
871 elf_sym_hashes (abfd
) = sym_hash
;
875 /* If we are creating a shared library, create all the dynamic
876 sections immediately. We need to attach them to something,
877 so we attach them to this BFD, provided it is the right
878 format. FIXME: If there are no input BFD's of the same
879 format as the output, we can't make a shared library. */
881 && ! elf_hash_table (info
)->dynamic_sections_created
882 && abfd
->xvec
== info
->hash
->creator
)
884 if (! elf_link_create_dynamic_sections (abfd
, info
))
893 bfd_size_type oldsize
;
894 bfd_size_type strindex
;
896 /* Find the name to use in a DT_NEEDED entry that refers to this
897 object. If the object has a DT_SONAME entry, we use it.
898 Otherwise, if the generic linker stuck something in
899 elf_dt_name, we use that. Otherwise, we just use the file
900 name. If the generic linker put a null string into
901 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
902 there is a DT_SONAME entry. */
904 name
= bfd_get_filename (abfd
);
905 if (elf_dt_name (abfd
) != NULL
)
907 name
= elf_dt_name (abfd
);
911 s
= bfd_get_section_by_name (abfd
, ".dynamic");
914 Elf_External_Dyn
*extdyn
;
915 Elf_External_Dyn
*extdynend
;
919 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
923 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
924 (file_ptr
) 0, s
->_raw_size
))
927 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
930 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
933 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
934 for (; extdyn
< extdynend
; extdyn
++)
936 Elf_Internal_Dyn dyn
;
938 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
939 if (dyn
.d_tag
== DT_SONAME
)
941 name
= bfd_elf_string_from_elf_section (abfd
, link
,
946 if (dyn
.d_tag
== DT_NEEDED
)
948 struct bfd_link_needed_list
*n
, **pn
;
951 n
= ((struct bfd_link_needed_list
*)
952 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
953 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
955 if (n
== NULL
|| fnm
== NULL
)
957 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
964 for (pn
= &elf_hash_table (info
)->needed
;
976 /* We do not want to include any of the sections in a dynamic
977 object in the output file. We hack by simply clobbering the
978 list of sections in the BFD. This could be handled more
979 cleanly by, say, a new section flag; the existing
980 SEC_NEVER_LOAD flag is not the one we want, because that one
981 still implies that the section takes up space in the output
983 abfd
->sections
= NULL
;
984 abfd
->section_count
= 0;
986 /* If this is the first dynamic object found in the link, create
987 the special sections required for dynamic linking. */
988 if (! elf_hash_table (info
)->dynamic_sections_created
)
990 if (! elf_link_create_dynamic_sections (abfd
, info
))
996 /* Add a DT_NEEDED entry for this dynamic object. */
997 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
998 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
1000 if (strindex
== (bfd_size_type
) -1)
1003 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1006 Elf_External_Dyn
*dyncon
, *dynconend
;
1008 /* The hash table size did not change, which means that
1009 the dynamic object name was already entered. If we
1010 have already included this dynamic object in the
1011 link, just ignore it. There is no reason to include
1012 a particular dynamic object more than once. */
1013 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1015 BFD_ASSERT (sdyn
!= NULL
);
1017 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1018 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1020 for (; dyncon
< dynconend
; dyncon
++)
1022 Elf_Internal_Dyn dyn
;
1024 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
1026 if (dyn
.d_tag
== DT_NEEDED
1027 && dyn
.d_un
.d_val
== strindex
)
1031 if (extversym
!= NULL
)
1038 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1042 /* Save the SONAME, if there is one, because sometimes the
1043 linker emulation code will need to know it. */
1045 name
= bfd_get_filename (abfd
);
1046 elf_dt_name (abfd
) = name
;
1050 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
1052 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
1053 != extsymcount
* sizeof (Elf_External_Sym
)))
1058 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1059 esymend
= buf
+ extsymcount
;
1062 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1064 Elf_Internal_Sym sym
;
1070 struct elf_link_hash_entry
*h
;
1072 boolean size_change_ok
, type_change_ok
;
1073 boolean new_weakdef
;
1074 unsigned int old_alignment
;
1076 elf_swap_symbol_in (abfd
, esym
, &sym
);
1078 flags
= BSF_NO_FLAGS
;
1080 value
= sym
.st_value
;
1083 bind
= ELF_ST_BIND (sym
.st_info
);
1084 if (bind
== STB_LOCAL
)
1086 /* This should be impossible, since ELF requires that all
1087 global symbols follow all local symbols, and that sh_info
1088 point to the first global symbol. Unfortunatealy, Irix 5
1092 else if (bind
== STB_GLOBAL
)
1094 if (sym
.st_shndx
!= SHN_UNDEF
1095 && sym
.st_shndx
!= SHN_COMMON
)
1100 else if (bind
== STB_WEAK
)
1104 /* Leave it up to the processor backend. */
1107 if (sym
.st_shndx
== SHN_UNDEF
)
1108 sec
= bfd_und_section_ptr
;
1109 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1111 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1113 sec
= bfd_abs_section_ptr
;
1114 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1117 else if (sym
.st_shndx
== SHN_ABS
)
1118 sec
= bfd_abs_section_ptr
;
1119 else if (sym
.st_shndx
== SHN_COMMON
)
1121 sec
= bfd_com_section_ptr
;
1122 /* What ELF calls the size we call the value. What ELF
1123 calls the value we call the alignment. */
1124 value
= sym
.st_size
;
1128 /* Leave it up to the processor backend. */
1131 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1132 if (name
== (const char *) NULL
)
1135 if (add_symbol_hook
)
1137 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1141 /* The hook function sets the name to NULL if this symbol
1142 should be skipped for some reason. */
1143 if (name
== (const char *) NULL
)
1147 /* Sanity check that all possibilities were handled. */
1148 if (sec
== (asection
*) NULL
)
1150 bfd_set_error (bfd_error_bad_value
);
1154 if (bfd_is_und_section (sec
)
1155 || bfd_is_com_section (sec
))
1160 size_change_ok
= false;
1161 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1163 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1165 Elf_Internal_Versym iver
;
1166 unsigned int vernum
= 0;
1171 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1172 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1174 /* If this is a hidden symbol, or if it is not version
1175 1, we append the version name to the symbol name.
1176 However, we do not modify a non-hidden absolute
1177 symbol, because it might be the version symbol
1178 itself. FIXME: What if it isn't? */
1179 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1180 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1183 int namelen
, newlen
;
1186 if (sym
.st_shndx
!= SHN_UNDEF
)
1188 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1190 (*_bfd_error_handler
)
1191 (_("%s: %s: invalid version %u (max %d)"),
1192 bfd_get_filename (abfd
), name
, vernum
,
1193 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1194 bfd_set_error (bfd_error_bad_value
);
1197 else if (vernum
> 1)
1199 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1205 /* We cannot simply test for the number of
1206 entries in the VERNEED section since the
1207 numbers for the needed versions do not start
1209 Elf_Internal_Verneed
*t
;
1212 for (t
= elf_tdata (abfd
)->verref
;
1216 Elf_Internal_Vernaux
*a
;
1218 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1220 if (a
->vna_other
== vernum
)
1222 verstr
= a
->vna_nodename
;
1231 (*_bfd_error_handler
)
1232 (_("%s: %s: invalid needed version %d"),
1233 bfd_get_filename (abfd
), name
, vernum
);
1234 bfd_set_error (bfd_error_bad_value
);
1239 namelen
= strlen (name
);
1240 newlen
= namelen
+ strlen (verstr
) + 2;
1241 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1244 newname
= (char *) bfd_alloc (abfd
, newlen
);
1245 if (newname
== NULL
)
1247 strcpy (newname
, name
);
1248 p
= newname
+ namelen
;
1250 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1258 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1259 sym_hash
, &override
, &type_change_ok
,
1267 while (h
->root
.type
== bfd_link_hash_indirect
1268 || h
->root
.type
== bfd_link_hash_warning
)
1269 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1271 /* Remember the old alignment if this is a common symbol, so
1272 that we don't reduce the alignment later on. We can't
1273 check later, because _bfd_generic_link_add_one_symbol
1274 will set a default for the alignment which we want to
1276 if (h
->root
.type
== bfd_link_hash_common
)
1277 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1279 if (elf_tdata (abfd
)->verdef
!= NULL
1283 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1286 if (! (_bfd_generic_link_add_one_symbol
1287 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1288 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1292 while (h
->root
.type
== bfd_link_hash_indirect
1293 || h
->root
.type
== bfd_link_hash_warning
)
1294 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1297 new_weakdef
= false;
1300 && (flags
& BSF_WEAK
) != 0
1301 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1302 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1303 && h
->weakdef
== NULL
)
1305 /* Keep a list of all weak defined non function symbols from
1306 a dynamic object, using the weakdef field. Later in this
1307 function we will set the weakdef field to the correct
1308 value. We only put non-function symbols from dynamic
1309 objects on this list, because that happens to be the only
1310 time we need to know the normal symbol corresponding to a
1311 weak symbol, and the information is time consuming to
1312 figure out. If the weakdef field is not already NULL,
1313 then this symbol was already defined by some previous
1314 dynamic object, and we will be using that previous
1315 definition anyhow. */
1322 /* Set the alignment of a common symbol. */
1323 if (sym
.st_shndx
== SHN_COMMON
1324 && h
->root
.type
== bfd_link_hash_common
)
1328 align
= bfd_log2 (sym
.st_value
);
1329 if (align
> old_alignment
)
1330 h
->root
.u
.c
.p
->alignment_power
= align
;
1333 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1339 /* Remember the symbol size and type. */
1340 if (sym
.st_size
!= 0
1341 && (definition
|| h
->size
== 0))
1343 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1344 (*_bfd_error_handler
)
1345 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1346 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1347 bfd_get_filename (abfd
));
1349 h
->size
= sym
.st_size
;
1352 /* If this is a common symbol, then we always want H->SIZE
1353 to be the size of the common symbol. The code just above
1354 won't fix the size if a common symbol becomes larger. We
1355 don't warn about a size change here, because that is
1356 covered by --warn-common. */
1357 if (h
->root
.type
== bfd_link_hash_common
)
1358 h
->size
= h
->root
.u
.c
.size
;
1360 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1361 && (definition
|| h
->type
== STT_NOTYPE
))
1363 if (h
->type
!= STT_NOTYPE
1364 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1365 && ! type_change_ok
)
1366 (*_bfd_error_handler
)
1367 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1368 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1369 bfd_get_filename (abfd
));
1371 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1374 if (sym
.st_other
!= 0
1375 && (definition
|| h
->other
== 0))
1376 h
->other
= sym
.st_other
;
1378 /* Set a flag in the hash table entry indicating the type of
1379 reference or definition we just found. Keep a count of
1380 the number of dynamic symbols we find. A dynamic symbol
1381 is one which is referenced or defined by both a regular
1382 object and a shared object. */
1383 old_flags
= h
->elf_link_hash_flags
;
1389 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1390 if (bind
!= STB_WEAK
)
1391 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1394 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1396 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1397 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1403 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1405 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1406 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1407 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1408 || (h
->weakdef
!= NULL
1410 && h
->weakdef
->dynindx
!= -1))
1414 h
->elf_link_hash_flags
|= new_flag
;
1416 /* If this symbol has a version, and it is the default
1417 version, we create an indirect symbol from the default
1418 name to the fully decorated name. This will cause
1419 external references which do not specify a version to be
1420 bound to this version of the symbol. */
1425 p
= strchr (name
, ELF_VER_CHR
);
1426 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1429 struct elf_link_hash_entry
*hi
;
1432 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1434 if (shortname
== NULL
)
1436 strncpy (shortname
, name
, p
- name
);
1437 shortname
[p
- name
] = '\0';
1439 /* We are going to create a new symbol. Merge it
1440 with any existing symbol with this name. For the
1441 purposes of the merge, act as though we were
1442 defining the symbol we just defined, although we
1443 actually going to define an indirect symbol. */
1444 type_change_ok
= false;
1445 size_change_ok
= false;
1446 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1447 &value
, &hi
, &override
,
1448 &type_change_ok
, &size_change_ok
))
1453 if (! (_bfd_generic_link_add_one_symbol
1454 (info
, abfd
, shortname
, BSF_INDIRECT
,
1455 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1456 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1461 /* In this case the symbol named SHORTNAME is
1462 overriding the indirect symbol we want to
1463 add. We were planning on making SHORTNAME an
1464 indirect symbol referring to NAME. SHORTNAME
1465 is the name without a version. NAME is the
1466 fully versioned name, and it is the default
1469 Overriding means that we already saw a
1470 definition for the symbol SHORTNAME in a
1471 regular object, and it is overriding the
1472 symbol defined in the dynamic object.
1474 When this happens, we actually want to change
1475 NAME, the symbol we just added, to refer to
1476 SHORTNAME. This will cause references to
1477 NAME in the shared object to become
1478 references to SHORTNAME in the regular
1479 object. This is what we expect when we
1480 override a function in a shared object: that
1481 the references in the shared object will be
1482 mapped to the definition in the regular
1485 while (hi
->root
.type
== bfd_link_hash_indirect
1486 || hi
->root
.type
== bfd_link_hash_warning
)
1487 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1489 h
->root
.type
= bfd_link_hash_indirect
;
1490 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1491 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1493 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1494 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1495 if (hi
->elf_link_hash_flags
1496 & (ELF_LINK_HASH_REF_REGULAR
1497 | ELF_LINK_HASH_DEF_REGULAR
))
1499 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1505 /* Now set HI to H, so that the following code
1506 will set the other fields correctly. */
1510 /* If there is a duplicate definition somewhere,
1511 then HI may not point to an indirect symbol. We
1512 will have reported an error to the user in that
1515 if (hi
->root
.type
== bfd_link_hash_indirect
)
1517 struct elf_link_hash_entry
*ht
;
1519 /* If the symbol became indirect, then we assume
1520 that we have not seen a definition before. */
1521 BFD_ASSERT ((hi
->elf_link_hash_flags
1522 & (ELF_LINK_HASH_DEF_DYNAMIC
1523 | ELF_LINK_HASH_DEF_REGULAR
))
1526 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1528 /* Copy down any references that we may have
1529 already seen to the symbol which just became
1531 ht
->elf_link_hash_flags
|=
1532 (hi
->elf_link_hash_flags
1533 & (ELF_LINK_HASH_REF_DYNAMIC
1534 | ELF_LINK_HASH_REF_REGULAR
1535 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1537 /* Copy over the global and procedure linkage table
1538 offset entries. These may have been already set
1539 up by a check_relocs routine. */
1540 if (ht
->got
.offset
== (bfd_vma
) -1)
1542 ht
->got
.offset
= hi
->got
.offset
;
1543 hi
->got
.offset
= (bfd_vma
) -1;
1545 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1547 if (ht
->plt
.offset
== (bfd_vma
) -1)
1549 ht
->plt
.offset
= hi
->plt
.offset
;
1550 hi
->plt
.offset
= (bfd_vma
) -1;
1552 BFD_ASSERT (hi
->plt
.offset
== (bfd_vma
) -1);
1554 if (ht
->dynindx
== -1)
1556 ht
->dynindx
= hi
->dynindx
;
1557 ht
->dynstr_index
= hi
->dynstr_index
;
1559 hi
->dynstr_index
= 0;
1561 BFD_ASSERT (hi
->dynindx
== -1);
1563 /* FIXME: There may be other information to copy
1564 over for particular targets. */
1566 /* See if the new flags lead us to realize that
1567 the symbol must be dynamic. */
1573 || ((hi
->elf_link_hash_flags
1574 & ELF_LINK_HASH_REF_DYNAMIC
)
1580 if ((hi
->elf_link_hash_flags
1581 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1587 /* We also need to define an indirection from the
1588 nondefault version of the symbol. */
1590 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1592 if (shortname
== NULL
)
1594 strncpy (shortname
, name
, p
- name
);
1595 strcpy (shortname
+ (p
- name
), p
+ 1);
1597 /* Once again, merge with any existing symbol. */
1598 type_change_ok
= false;
1599 size_change_ok
= false;
1600 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1601 &value
, &hi
, &override
,
1602 &type_change_ok
, &size_change_ok
))
1607 /* Here SHORTNAME is a versioned name, so we
1608 don't expect to see the type of override we
1609 do in the case above. */
1610 (*_bfd_error_handler
)
1611 (_("%s: warning: unexpected redefinition of `%s'"),
1612 bfd_get_filename (abfd
), shortname
);
1616 if (! (_bfd_generic_link_add_one_symbol
1617 (info
, abfd
, shortname
, BSF_INDIRECT
,
1618 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1619 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1622 /* If there is a duplicate definition somewhere,
1623 then HI may not point to an indirect symbol.
1624 We will have reported an error to the user in
1627 if (hi
->root
.type
== bfd_link_hash_indirect
)
1629 /* If the symbol became indirect, then we
1630 assume that we have not seen a definition
1632 BFD_ASSERT ((hi
->elf_link_hash_flags
1633 & (ELF_LINK_HASH_DEF_DYNAMIC
1634 | ELF_LINK_HASH_DEF_REGULAR
))
1637 /* Copy down any references that we may have
1638 already seen to the symbol which just
1640 h
->elf_link_hash_flags
|=
1641 (hi
->elf_link_hash_flags
1642 & (ELF_LINK_HASH_REF_DYNAMIC
1643 | ELF_LINK_HASH_REF_REGULAR
1644 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1646 /* Copy over the global and procedure linkage
1647 table offset entries. These may have been
1648 already set up by a check_relocs routine. */
1649 if (h
->got
.offset
== (bfd_vma
) -1)
1651 h
->got
.offset
= hi
->got
.offset
;
1652 hi
->got
.offset
= (bfd_vma
) -1;
1654 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1656 if (h
->plt
.offset
== (bfd_vma
) -1)
1658 h
->plt
.offset
= hi
->plt
.offset
;
1659 hi
->plt
.offset
= (bfd_vma
) -1;
1661 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1663 if (h
->dynindx
== -1)
1665 h
->dynindx
= hi
->dynindx
;
1666 h
->dynstr_index
= hi
->dynstr_index
;
1668 hi
->dynstr_index
= 0;
1670 BFD_ASSERT (hi
->dynindx
== -1);
1672 /* FIXME: There may be other information to
1673 copy over for particular targets. */
1675 /* See if the new flags lead us to realize
1676 that the symbol must be dynamic. */
1682 || ((hi
->elf_link_hash_flags
1683 & ELF_LINK_HASH_REF_DYNAMIC
)
1689 if ((hi
->elf_link_hash_flags
1690 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1699 if (dynsym
&& h
->dynindx
== -1)
1701 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1703 if (h
->weakdef
!= NULL
1705 && h
->weakdef
->dynindx
== -1)
1707 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1715 /* Now set the weakdefs field correctly for all the weak defined
1716 symbols we found. The only way to do this is to search all the
1717 symbols. Since we only need the information for non functions in
1718 dynamic objects, that's the only time we actually put anything on
1719 the list WEAKS. We need this information so that if a regular
1720 object refers to a symbol defined weakly in a dynamic object, the
1721 real symbol in the dynamic object is also put in the dynamic
1722 symbols; we also must arrange for both symbols to point to the
1723 same memory location. We could handle the general case of symbol
1724 aliasing, but a general symbol alias can only be generated in
1725 assembler code, handling it correctly would be very time
1726 consuming, and other ELF linkers don't handle general aliasing
1728 while (weaks
!= NULL
)
1730 struct elf_link_hash_entry
*hlook
;
1733 struct elf_link_hash_entry
**hpp
;
1734 struct elf_link_hash_entry
**hppend
;
1737 weaks
= hlook
->weakdef
;
1738 hlook
->weakdef
= NULL
;
1740 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1741 || hlook
->root
.type
== bfd_link_hash_defweak
1742 || hlook
->root
.type
== bfd_link_hash_common
1743 || hlook
->root
.type
== bfd_link_hash_indirect
);
1744 slook
= hlook
->root
.u
.def
.section
;
1745 vlook
= hlook
->root
.u
.def
.value
;
1747 hpp
= elf_sym_hashes (abfd
);
1748 hppend
= hpp
+ extsymcount
;
1749 for (; hpp
< hppend
; hpp
++)
1751 struct elf_link_hash_entry
*h
;
1754 if (h
!= NULL
&& h
!= hlook
1755 && h
->root
.type
== bfd_link_hash_defined
1756 && h
->root
.u
.def
.section
== slook
1757 && h
->root
.u
.def
.value
== vlook
)
1761 /* If the weak definition is in the list of dynamic
1762 symbols, make sure the real definition is put there
1764 if (hlook
->dynindx
!= -1
1765 && h
->dynindx
== -1)
1767 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1771 /* If the real definition is in the list of dynamic
1772 symbols, make sure the weak definition is put there
1773 as well. If we don't do this, then the dynamic
1774 loader might not merge the entries for the real
1775 definition and the weak definition. */
1776 if (h
->dynindx
!= -1
1777 && hlook
->dynindx
== -1)
1779 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1794 if (extversym
!= NULL
)
1800 /* If this object is the same format as the output object, and it is
1801 not a shared library, then let the backend look through the
1804 This is required to build global offset table entries and to
1805 arrange for dynamic relocs. It is not required for the
1806 particular common case of linking non PIC code, even when linking
1807 against shared libraries, but unfortunately there is no way of
1808 knowing whether an object file has been compiled PIC or not.
1809 Looking through the relocs is not particularly time consuming.
1810 The problem is that we must either (1) keep the relocs in memory,
1811 which causes the linker to require additional runtime memory or
1812 (2) read the relocs twice from the input file, which wastes time.
1813 This would be a good case for using mmap.
1815 I have no idea how to handle linking PIC code into a file of a
1816 different format. It probably can't be done. */
1817 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1819 && abfd
->xvec
== info
->hash
->creator
1820 && check_relocs
!= NULL
)
1824 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1826 Elf_Internal_Rela
*internal_relocs
;
1829 if ((o
->flags
& SEC_RELOC
) == 0
1830 || o
->reloc_count
== 0
1831 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1832 && (o
->flags
& SEC_DEBUGGING
) != 0)
1833 || bfd_is_abs_section (o
->output_section
))
1836 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1837 (abfd
, o
, (PTR
) NULL
,
1838 (Elf_Internal_Rela
*) NULL
,
1839 info
->keep_memory
));
1840 if (internal_relocs
== NULL
)
1843 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1845 if (! info
->keep_memory
)
1846 free (internal_relocs
);
1853 /* If this is a non-traditional, non-relocateable link, try to
1854 optimize the handling of the .stab/.stabstr sections. */
1856 && ! info
->relocateable
1857 && ! info
->traditional_format
1858 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1859 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1861 asection
*stab
, *stabstr
;
1863 stab
= bfd_get_section_by_name (abfd
, ".stab");
1866 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1868 if (stabstr
!= NULL
)
1870 struct bfd_elf_section_data
*secdata
;
1872 secdata
= elf_section_data (stab
);
1873 if (! _bfd_link_section_stabs (abfd
,
1874 &elf_hash_table (info
)->stab_info
,
1876 &secdata
->stab_info
))
1891 if (extversym
!= NULL
)
1896 /* Create some sections which will be filled in with dynamic linking
1897 information. ABFD is an input file which requires dynamic sections
1898 to be created. The dynamic sections take up virtual memory space
1899 when the final executable is run, so we need to create them before
1900 addresses are assigned to the output sections. We work out the
1901 actual contents and size of these sections later. */
1904 elf_link_create_dynamic_sections (abfd
, info
)
1906 struct bfd_link_info
*info
;
1909 register asection
*s
;
1910 struct elf_link_hash_entry
*h
;
1911 struct elf_backend_data
*bed
;
1913 if (elf_hash_table (info
)->dynamic_sections_created
)
1916 /* Make sure that all dynamic sections use the same input BFD. */
1917 if (elf_hash_table (info
)->dynobj
== NULL
)
1918 elf_hash_table (info
)->dynobj
= abfd
;
1920 abfd
= elf_hash_table (info
)->dynobj
;
1922 /* Note that we set the SEC_IN_MEMORY flag for all of these
1924 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1925 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1927 /* A dynamically linked executable has a .interp section, but a
1928 shared library does not. */
1931 s
= bfd_make_section (abfd
, ".interp");
1933 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1937 /* Create sections to hold version informations. These are removed
1938 if they are not needed. */
1939 s
= bfd_make_section (abfd
, ".gnu.version_d");
1941 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1942 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1945 s
= bfd_make_section (abfd
, ".gnu.version");
1947 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1948 || ! bfd_set_section_alignment (abfd
, s
, 1))
1951 s
= bfd_make_section (abfd
, ".gnu.version_r");
1953 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1954 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1957 s
= bfd_make_section (abfd
, ".dynsym");
1959 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1960 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1963 s
= bfd_make_section (abfd
, ".dynstr");
1965 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1968 /* Create a strtab to hold the dynamic symbol names. */
1969 if (elf_hash_table (info
)->dynstr
== NULL
)
1971 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1972 if (elf_hash_table (info
)->dynstr
== NULL
)
1976 s
= bfd_make_section (abfd
, ".dynamic");
1978 || ! bfd_set_section_flags (abfd
, s
, flags
)
1979 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1982 /* The special symbol _DYNAMIC is always set to the start of the
1983 .dynamic section. This call occurs before we have processed the
1984 symbols for any dynamic object, so we don't have to worry about
1985 overriding a dynamic definition. We could set _DYNAMIC in a
1986 linker script, but we only want to define it if we are, in fact,
1987 creating a .dynamic section. We don't want to define it if there
1988 is no .dynamic section, since on some ELF platforms the start up
1989 code examines it to decide how to initialize the process. */
1991 if (! (_bfd_generic_link_add_one_symbol
1992 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1993 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1994 (struct bfd_link_hash_entry
**) &h
)))
1996 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1997 h
->type
= STT_OBJECT
;
2000 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2003 bed
= get_elf_backend_data (abfd
);
2005 s
= bfd_make_section (abfd
, ".hash");
2007 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2008 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2010 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2012 /* Let the backend create the rest of the sections. This lets the
2013 backend set the right flags. The backend will normally create
2014 the .got and .plt sections. */
2015 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2018 elf_hash_table (info
)->dynamic_sections_created
= true;
2023 /* Add an entry to the .dynamic table. */
2026 elf_add_dynamic_entry (info
, tag
, val
)
2027 struct bfd_link_info
*info
;
2031 Elf_Internal_Dyn dyn
;
2035 bfd_byte
*newcontents
;
2037 dynobj
= elf_hash_table (info
)->dynobj
;
2039 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2040 BFD_ASSERT (s
!= NULL
);
2042 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2043 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2044 if (newcontents
== NULL
)
2048 dyn
.d_un
.d_val
= val
;
2049 elf_swap_dyn_out (dynobj
, &dyn
,
2050 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2052 s
->_raw_size
= newsize
;
2053 s
->contents
= newcontents
;
2058 /* Record a new local dynamic symbol. */
2061 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2062 struct bfd_link_info
*info
;
2066 struct elf_link_local_dynamic_entry
*entry
;
2067 struct elf_link_hash_table
*eht
;
2068 struct bfd_strtab_hash
*dynstr
;
2069 Elf_External_Sym esym
;
2070 unsigned long dynstr_index
;
2073 /* See if the entry exists already. */
2074 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2075 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2078 entry
= (struct elf_link_local_dynamic_entry
*)
2079 bfd_alloc (input_bfd
, sizeof (*entry
));
2083 /* Go find the symbol, so that we can find it's name. */
2084 if (bfd_seek (input_bfd
,
2085 (elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
2086 + input_indx
* sizeof (Elf_External_Sym
)),
2088 || (bfd_read (&esym
, sizeof (Elf_External_Sym
), 1, input_bfd
)
2089 != sizeof (Elf_External_Sym
)))
2091 elf_swap_symbol_in (input_bfd
, &esym
, &entry
->isym
);
2093 name
= (bfd_elf_string_from_elf_section
2094 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2095 entry
->isym
.st_name
));
2097 dynstr
= elf_hash_table (info
)->dynstr
;
2100 /* Create a strtab to hold the dynamic symbol names. */
2101 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_stringtab_init ();
2106 dynstr_index
= _bfd_stringtab_add (dynstr
, name
, true, false);
2107 if (dynstr_index
== (unsigned long) -1)
2109 entry
->isym
.st_name
= dynstr_index
;
2111 eht
= elf_hash_table (info
);
2113 entry
->next
= eht
->dynlocal
;
2114 eht
->dynlocal
= entry
;
2115 entry
->input_bfd
= input_bfd
;
2116 entry
->input_indx
= input_indx
;
2119 /* Whatever binding the symbol had before, it's now local. */
2121 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2123 /* The dynindx will be set at the end of size_dynamic_sections. */
2129 /* Read and swap the relocs from the section indicated by SHDR. This
2130 may be either a REL or a RELA section. The relocations are
2131 translated into RELA relocations and stored in INTERNAL_RELOCS,
2132 which should have already been allocated to contain enough space.
2133 The EXTERNAL_RELOCS are a buffer where the external form of the
2134 relocations should be stored.
2136 Returns false if something goes wrong. */
2139 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2142 Elf_Internal_Shdr
*shdr
;
2143 PTR external_relocs
;
2144 Elf_Internal_Rela
*internal_relocs
;
2146 struct elf_backend_data
*bed
;
2148 /* If there aren't any relocations, that's OK. */
2152 /* Position ourselves at the start of the section. */
2153 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2156 /* Read the relocations. */
2157 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2161 bed
= get_elf_backend_data (abfd
);
2163 /* Convert the external relocations to the internal format. */
2164 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2166 Elf_External_Rel
*erel
;
2167 Elf_External_Rel
*erelend
;
2168 Elf_Internal_Rela
*irela
;
2169 Elf_Internal_Rel
*irel
;
2171 erel
= (Elf_External_Rel
*) external_relocs
;
2172 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2173 irela
= internal_relocs
;
2174 irel
= bfd_alloc (abfd
, (bed
->s
->int_rels_per_ext_rel
2175 * sizeof (Elf_Internal_Rel
)));
2176 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2180 if (bed
->s
->swap_reloc_in
)
2181 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2183 elf_swap_reloc_in (abfd
, erel
, irel
);
2185 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2187 irela
[i
].r_offset
= irel
[i
].r_offset
;
2188 irela
[i
].r_info
= irel
[i
].r_info
;
2189 irela
[i
].r_addend
= 0;
2195 Elf_External_Rela
*erela
;
2196 Elf_External_Rela
*erelaend
;
2197 Elf_Internal_Rela
*irela
;
2199 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2201 erela
= (Elf_External_Rela
*) external_relocs
;
2202 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2203 irela
= internal_relocs
;
2204 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2206 if (bed
->s
->swap_reloca_in
)
2207 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2209 elf_swap_reloca_in (abfd
, erela
, irela
);
2216 /* Read and swap the relocs for a section O. They may have been
2217 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2218 not NULL, they are used as buffers to read into. They are known to
2219 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2220 the return value is allocated using either malloc or bfd_alloc,
2221 according to the KEEP_MEMORY argument. If O has two relocation
2222 sections (both REL and RELA relocations), then the REL_HDR
2223 relocations will appear first in INTERNAL_RELOCS, followed by the
2224 REL_HDR2 relocations. */
2227 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2231 PTR external_relocs
;
2232 Elf_Internal_Rela
*internal_relocs
;
2233 boolean keep_memory
;
2235 Elf_Internal_Shdr
*rel_hdr
;
2237 Elf_Internal_Rela
*alloc2
= NULL
;
2238 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2240 if (elf_section_data (o
)->relocs
!= NULL
)
2241 return elf_section_data (o
)->relocs
;
2243 if (o
->reloc_count
== 0)
2246 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2248 if (internal_relocs
== NULL
)
2252 size
= (o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
2253 * sizeof (Elf_Internal_Rela
));
2255 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2257 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2258 if (internal_relocs
== NULL
)
2262 if (external_relocs
== NULL
)
2264 size_t size
= (size_t) rel_hdr
->sh_size
;
2266 if (elf_section_data (o
)->rel_hdr2
)
2267 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2268 alloc1
= (PTR
) bfd_malloc (size
);
2271 external_relocs
= alloc1
;
2274 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2278 if (!elf_link_read_relocs_from_section
2280 elf_section_data (o
)->rel_hdr2
,
2281 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2282 internal_relocs
+ (rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
2283 * bed
->s
->int_rels_per_ext_rel
)))
2286 /* Cache the results for next time, if we can. */
2288 elf_section_data (o
)->relocs
= internal_relocs
;
2293 /* Don't free alloc2, since if it was allocated we are passing it
2294 back (under the name of internal_relocs). */
2296 return internal_relocs
;
2307 /* Record an assignment to a symbol made by a linker script. We need
2308 this in case some dynamic object refers to this symbol. */
2312 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2313 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2314 struct bfd_link_info
*info
;
2318 struct elf_link_hash_entry
*h
;
2320 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2323 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2327 if (h
->root
.type
== bfd_link_hash_new
)
2328 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2330 /* If this symbol is being provided by the linker script, and it is
2331 currently defined by a dynamic object, but not by a regular
2332 object, then mark it as undefined so that the generic linker will
2333 force the correct value. */
2335 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2336 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2337 h
->root
.type
= bfd_link_hash_undefined
;
2339 /* If this symbol is not being provided by the linker script, and it is
2340 currently defined by a dynamic object, but not by a regular object,
2341 then clear out any version information because the symbol will not be
2342 associated with the dynamic object any more. */
2344 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2345 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2346 h
->verinfo
.verdef
= NULL
;
2348 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2349 h
->type
= STT_OBJECT
;
2351 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2352 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2354 && h
->dynindx
== -1)
2356 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2359 /* If this is a weak defined symbol, and we know a corresponding
2360 real symbol from the same dynamic object, make sure the real
2361 symbol is also made into a dynamic symbol. */
2362 if (h
->weakdef
!= NULL
2363 && h
->weakdef
->dynindx
== -1)
2365 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2373 /* This structure is used to pass information to
2374 elf_link_assign_sym_version. */
2376 struct elf_assign_sym_version_info
2380 /* General link information. */
2381 struct bfd_link_info
*info
;
2383 struct bfd_elf_version_tree
*verdefs
;
2384 /* Whether we are exporting all dynamic symbols. */
2385 boolean export_dynamic
;
2386 /* Whether we had a failure. */
2390 /* This structure is used to pass information to
2391 elf_link_find_version_dependencies. */
2393 struct elf_find_verdep_info
2397 /* General link information. */
2398 struct bfd_link_info
*info
;
2399 /* The number of dependencies. */
2401 /* Whether we had a failure. */
2405 /* Array used to determine the number of hash table buckets to use
2406 based on the number of symbols there are. If there are fewer than
2407 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2408 fewer than 37 we use 17 buckets, and so forth. We never use more
2409 than 32771 buckets. */
2411 static const size_t elf_buckets
[] =
2413 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2417 /* Compute bucket count for hashing table. We do not use a static set
2418 of possible tables sizes anymore. Instead we determine for all
2419 possible reasonable sizes of the table the outcome (i.e., the
2420 number of collisions etc) and choose the best solution. The
2421 weighting functions are not too simple to allow the table to grow
2422 without bounds. Instead one of the weighting factors is the size.
2423 Therefore the result is always a good payoff between few collisions
2424 (= short chain lengths) and table size. */
2426 compute_bucket_count (info
)
2427 struct bfd_link_info
*info
;
2429 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2430 size_t best_size
= 0;
2431 unsigned long int *hashcodes
;
2432 unsigned long int *hashcodesp
;
2433 unsigned long int i
;
2435 /* Compute the hash values for all exported symbols. At the same
2436 time store the values in an array so that we could use them for
2438 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2439 * sizeof (unsigned long int));
2440 if (hashcodes
== NULL
)
2442 hashcodesp
= hashcodes
;
2444 /* Put all hash values in HASHCODES. */
2445 elf_link_hash_traverse (elf_hash_table (info
),
2446 elf_collect_hash_codes
, &hashcodesp
);
2448 /* We have a problem here. The following code to optimize the table
2449 size requires an integer type with more the 32 bits. If
2450 BFD_HOST_U_64_BIT is set we know about such a type. */
2451 #ifdef BFD_HOST_U_64_BIT
2452 if (info
->optimize
== true)
2454 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2457 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2458 unsigned long int *counts
;
2460 /* Possible optimization parameters: if we have NSYMS symbols we say
2461 that the hashing table must at least have NSYMS/4 and at most
2463 minsize
= nsyms
/ 4;
2466 best_size
= maxsize
= nsyms
* 2;
2468 /* Create array where we count the collisions in. We must use bfd_malloc
2469 since the size could be large. */
2470 counts
= (unsigned long int *) bfd_malloc (maxsize
2471 * sizeof (unsigned long int));
2478 /* Compute the "optimal" size for the hash table. The criteria is a
2479 minimal chain length. The minor criteria is (of course) the size
2481 for (i
= minsize
; i
< maxsize
; ++i
)
2483 /* Walk through the array of hashcodes and count the collisions. */
2484 BFD_HOST_U_64_BIT max
;
2485 unsigned long int j
;
2486 unsigned long int fact
;
2488 memset (counts
, '\0', i
* sizeof (unsigned long int));
2490 /* Determine how often each hash bucket is used. */
2491 for (j
= 0; j
< nsyms
; ++j
)
2492 ++counts
[hashcodes
[j
] % i
];
2494 /* For the weight function we need some information about the
2495 pagesize on the target. This is information need not be 100%
2496 accurate. Since this information is not available (so far) we
2497 define it here to a reasonable default value. If it is crucial
2498 to have a better value some day simply define this value. */
2499 # ifndef BFD_TARGET_PAGESIZE
2500 # define BFD_TARGET_PAGESIZE (4096)
2503 /* We in any case need 2 + NSYMS entries for the size values and
2505 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2508 /* Variant 1: optimize for short chains. We add the squares
2509 of all the chain lengths (which favous many small chain
2510 over a few long chains). */
2511 for (j
= 0; j
< i
; ++j
)
2512 max
+= counts
[j
] * counts
[j
];
2514 /* This adds penalties for the overall size of the table. */
2515 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2518 /* Variant 2: Optimize a lot more for small table. Here we
2519 also add squares of the size but we also add penalties for
2520 empty slots (the +1 term). */
2521 for (j
= 0; j
< i
; ++j
)
2522 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2524 /* The overall size of the table is considered, but not as
2525 strong as in variant 1, where it is squared. */
2526 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2530 /* Compare with current best results. */
2531 if (max
< best_chlen
)
2541 #endif /* defined (BFD_HOST_U_64_BIT) */
2543 /* This is the fallback solution if no 64bit type is available or if we
2544 are not supposed to spend much time on optimizations. We select the
2545 bucket count using a fixed set of numbers. */
2546 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2548 best_size
= elf_buckets
[i
];
2549 if (dynsymcount
< elf_buckets
[i
+ 1])
2554 /* Free the arrays we needed. */
2560 /* Set up the sizes and contents of the ELF dynamic sections. This is
2561 called by the ELF linker emulation before_allocation routine. We
2562 must set the sizes of the sections before the linker sets the
2563 addresses of the various sections. */
2566 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2567 export_dynamic
, filter_shlib
,
2568 auxiliary_filters
, info
, sinterpptr
,
2573 boolean export_dynamic
;
2574 const char *filter_shlib
;
2575 const char * const *auxiliary_filters
;
2576 struct bfd_link_info
*info
;
2577 asection
**sinterpptr
;
2578 struct bfd_elf_version_tree
*verdefs
;
2580 bfd_size_type soname_indx
;
2582 struct elf_backend_data
*bed
;
2583 struct elf_assign_sym_version_info asvinfo
;
2587 soname_indx
= (bfd_size_type
) -1;
2589 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2592 /* The backend may have to create some sections regardless of whether
2593 we're dynamic or not. */
2594 bed
= get_elf_backend_data (output_bfd
);
2595 if (bed
->elf_backend_always_size_sections
2596 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2599 dynobj
= elf_hash_table (info
)->dynobj
;
2601 /* If there were no dynamic objects in the link, there is nothing to
2606 /* If we are supposed to export all symbols into the dynamic symbol
2607 table (this is not the normal case), then do so. */
2610 struct elf_info_failed eif
;
2614 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2620 if (elf_hash_table (info
)->dynamic_sections_created
)
2622 struct elf_info_failed eif
;
2623 struct elf_link_hash_entry
*h
;
2624 bfd_size_type strsize
;
2626 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2627 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2631 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2632 soname
, true, true);
2633 if (soname_indx
== (bfd_size_type
) -1
2634 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2640 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2648 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2650 if (indx
== (bfd_size_type
) -1
2651 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2655 if (filter_shlib
!= NULL
)
2659 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2660 filter_shlib
, true, true);
2661 if (indx
== (bfd_size_type
) -1
2662 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2666 if (auxiliary_filters
!= NULL
)
2668 const char * const *p
;
2670 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2674 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2676 if (indx
== (bfd_size_type
) -1
2677 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2682 /* Attach all the symbols to their version information. */
2683 asvinfo
.output_bfd
= output_bfd
;
2684 asvinfo
.info
= info
;
2685 asvinfo
.verdefs
= verdefs
;
2686 asvinfo
.export_dynamic
= export_dynamic
;
2687 asvinfo
.failed
= false;
2689 elf_link_hash_traverse (elf_hash_table (info
),
2690 elf_link_assign_sym_version
,
2695 /* Find all symbols which were defined in a dynamic object and make
2696 the backend pick a reasonable value for them. */
2699 elf_link_hash_traverse (elf_hash_table (info
),
2700 elf_adjust_dynamic_symbol
,
2705 /* Add some entries to the .dynamic section. We fill in some of the
2706 values later, in elf_bfd_final_link, but we must add the entries
2707 now so that we know the final size of the .dynamic section. */
2709 /* If there are initialization and/or finalization functions to
2710 call then add the corresponding DT_INIT/DT_FINI entries. */
2711 h
= (info
->init_function
2712 ? elf_link_hash_lookup (elf_hash_table (info
),
2713 info
->init_function
, false,
2717 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2718 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2720 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2723 h
= (info
->fini_function
2724 ? elf_link_hash_lookup (elf_hash_table (info
),
2725 info
->fini_function
, false,
2729 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2730 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2732 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2736 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2737 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2738 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2739 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2740 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2741 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2742 sizeof (Elf_External_Sym
)))
2746 /* The backend must work out the sizes of all the other dynamic
2748 if (bed
->elf_backend_size_dynamic_sections
2749 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2752 if (elf_hash_table (info
)->dynamic_sections_created
)
2756 size_t bucketcount
= 0;
2757 Elf_Internal_Sym isym
;
2758 size_t hash_entry_size
;
2760 /* Set up the version definition section. */
2761 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2762 BFD_ASSERT (s
!= NULL
);
2764 /* We may have created additional version definitions if we are
2765 just linking a regular application. */
2766 verdefs
= asvinfo
.verdefs
;
2768 if (verdefs
== NULL
)
2769 _bfd_strip_section_from_output (s
);
2774 struct bfd_elf_version_tree
*t
;
2776 Elf_Internal_Verdef def
;
2777 Elf_Internal_Verdaux defaux
;
2782 /* Make space for the base version. */
2783 size
+= sizeof (Elf_External_Verdef
);
2784 size
+= sizeof (Elf_External_Verdaux
);
2787 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2789 struct bfd_elf_version_deps
*n
;
2791 size
+= sizeof (Elf_External_Verdef
);
2792 size
+= sizeof (Elf_External_Verdaux
);
2795 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2796 size
+= sizeof (Elf_External_Verdaux
);
2799 s
->_raw_size
= size
;
2800 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2801 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2804 /* Fill in the version definition section. */
2808 def
.vd_version
= VER_DEF_CURRENT
;
2809 def
.vd_flags
= VER_FLG_BASE
;
2812 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2813 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2814 + sizeof (Elf_External_Verdaux
));
2816 if (soname_indx
!= (bfd_size_type
) -1)
2818 def
.vd_hash
= bfd_elf_hash (soname
);
2819 defaux
.vda_name
= soname_indx
;
2826 name
= output_bfd
->filename
;
2827 def
.vd_hash
= bfd_elf_hash (name
);
2828 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2830 if (indx
== (bfd_size_type
) -1)
2832 defaux
.vda_name
= indx
;
2834 defaux
.vda_next
= 0;
2836 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2837 (Elf_External_Verdef
*)p
);
2838 p
+= sizeof (Elf_External_Verdef
);
2839 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2840 (Elf_External_Verdaux
*) p
);
2841 p
+= sizeof (Elf_External_Verdaux
);
2843 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2846 struct bfd_elf_version_deps
*n
;
2847 struct elf_link_hash_entry
*h
;
2850 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2853 /* Add a symbol representing this version. */
2855 if (! (_bfd_generic_link_add_one_symbol
2856 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2857 (bfd_vma
) 0, (const char *) NULL
, false,
2858 get_elf_backend_data (dynobj
)->collect
,
2859 (struct bfd_link_hash_entry
**) &h
)))
2861 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2862 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2863 h
->type
= STT_OBJECT
;
2864 h
->verinfo
.vertree
= t
;
2866 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2869 def
.vd_version
= VER_DEF_CURRENT
;
2871 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2872 def
.vd_flags
|= VER_FLG_WEAK
;
2873 def
.vd_ndx
= t
->vernum
+ 1;
2874 def
.vd_cnt
= cdeps
+ 1;
2875 def
.vd_hash
= bfd_elf_hash (t
->name
);
2876 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2877 if (t
->next
!= NULL
)
2878 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2879 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2883 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2884 (Elf_External_Verdef
*) p
);
2885 p
+= sizeof (Elf_External_Verdef
);
2887 defaux
.vda_name
= h
->dynstr_index
;
2888 if (t
->deps
== NULL
)
2889 defaux
.vda_next
= 0;
2891 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2892 t
->name_indx
= defaux
.vda_name
;
2894 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2895 (Elf_External_Verdaux
*) p
);
2896 p
+= sizeof (Elf_External_Verdaux
);
2898 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2900 if (n
->version_needed
== NULL
)
2902 /* This can happen if there was an error in the
2904 defaux
.vda_name
= 0;
2907 defaux
.vda_name
= n
->version_needed
->name_indx
;
2908 if (n
->next
== NULL
)
2909 defaux
.vda_next
= 0;
2911 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2913 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2914 (Elf_External_Verdaux
*) p
);
2915 p
+= sizeof (Elf_External_Verdaux
);
2919 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2920 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2923 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2926 /* Work out the size of the version reference section. */
2928 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2929 BFD_ASSERT (s
!= NULL
);
2931 struct elf_find_verdep_info sinfo
;
2933 sinfo
.output_bfd
= output_bfd
;
2935 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2936 if (sinfo
.vers
== 0)
2938 sinfo
.failed
= false;
2940 elf_link_hash_traverse (elf_hash_table (info
),
2941 elf_link_find_version_dependencies
,
2944 if (elf_tdata (output_bfd
)->verref
== NULL
)
2945 _bfd_strip_section_from_output (s
);
2948 Elf_Internal_Verneed
*t
;
2953 /* Build the version definition section. */
2956 for (t
= elf_tdata (output_bfd
)->verref
;
2960 Elf_Internal_Vernaux
*a
;
2962 size
+= sizeof (Elf_External_Verneed
);
2964 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2965 size
+= sizeof (Elf_External_Vernaux
);
2968 s
->_raw_size
= size
;
2969 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2970 if (s
->contents
== NULL
)
2974 for (t
= elf_tdata (output_bfd
)->verref
;
2979 Elf_Internal_Vernaux
*a
;
2983 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2986 t
->vn_version
= VER_NEED_CURRENT
;
2988 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2989 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2990 elf_dt_name (t
->vn_bfd
),
2993 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2994 t
->vn_bfd
->filename
, true, false);
2995 if (indx
== (bfd_size_type
) -1)
2998 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2999 if (t
->vn_nextref
== NULL
)
3002 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3003 + caux
* sizeof (Elf_External_Vernaux
));
3005 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3006 (Elf_External_Verneed
*) p
);
3007 p
+= sizeof (Elf_External_Verneed
);
3009 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3011 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3012 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3013 a
->vna_nodename
, true, false);
3014 if (indx
== (bfd_size_type
) -1)
3017 if (a
->vna_nextptr
== NULL
)
3020 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3022 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3023 (Elf_External_Vernaux
*) p
);
3024 p
+= sizeof (Elf_External_Vernaux
);
3028 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
3029 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
3032 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3036 /* Assign dynsym indicies. In a shared library we generate a
3037 section symbol for each output section, which come first.
3038 Next come all of the back-end allocated local dynamic syms,
3039 followed by the rest of the global symbols. */
3041 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3043 /* Work out the size of the symbol version section. */
3044 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3045 BFD_ASSERT (s
!= NULL
);
3046 if (dynsymcount
== 0
3047 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3049 _bfd_strip_section_from_output (s
);
3050 /* The DYNSYMCOUNT might have changed if we were going to
3051 output a dynamic symbol table entry for S. */
3052 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3056 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3057 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3058 if (s
->contents
== NULL
)
3061 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
3065 /* Set the size of the .dynsym and .hash sections. We counted
3066 the number of dynamic symbols in elf_link_add_object_symbols.
3067 We will build the contents of .dynsym and .hash when we build
3068 the final symbol table, because until then we do not know the
3069 correct value to give the symbols. We built the .dynstr
3070 section as we went along in elf_link_add_object_symbols. */
3071 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3072 BFD_ASSERT (s
!= NULL
);
3073 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3074 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3075 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3078 /* The first entry in .dynsym is a dummy symbol. */
3085 elf_swap_symbol_out (output_bfd
, &isym
,
3086 (PTR
) (Elf_External_Sym
*) s
->contents
);
3088 /* Compute the size of the hashing table. As a side effect this
3089 computes the hash values for all the names we export. */
3090 bucketcount
= compute_bucket_count (info
);
3092 s
= bfd_get_section_by_name (dynobj
, ".hash");
3093 BFD_ASSERT (s
!= NULL
);
3094 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3095 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3096 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3097 if (s
->contents
== NULL
)
3099 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3101 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
3102 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
3103 s
->contents
+ hash_entry_size
);
3105 elf_hash_table (info
)->bucketcount
= bucketcount
;
3107 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3108 BFD_ASSERT (s
!= NULL
);
3109 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3111 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3118 /* Fix up the flags for a symbol. This handles various cases which
3119 can only be fixed after all the input files are seen. This is
3120 currently called by both adjust_dynamic_symbol and
3121 assign_sym_version, which is unnecessary but perhaps more robust in
3122 the face of future changes. */
3125 elf_fix_symbol_flags (h
, eif
)
3126 struct elf_link_hash_entry
*h
;
3127 struct elf_info_failed
*eif
;
3129 /* If this symbol was mentioned in a non-ELF file, try to set
3130 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3131 permit a non-ELF file to correctly refer to a symbol defined in
3132 an ELF dynamic object. */
3133 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3135 if (h
->root
.type
!= bfd_link_hash_defined
3136 && h
->root
.type
!= bfd_link_hash_defweak
)
3137 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3138 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3141 if (h
->root
.u
.def
.section
->owner
!= NULL
3142 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3143 == bfd_target_elf_flavour
))
3144 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3145 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3147 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3150 if (h
->dynindx
== -1
3151 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3152 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3154 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3163 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3164 was first seen in a non-ELF file. Fortunately, if the symbol
3165 was first seen in an ELF file, we're probably OK unless the
3166 symbol was defined in a non-ELF file. Catch that case here.
3167 FIXME: We're still in trouble if the symbol was first seen in
3168 a dynamic object, and then later in a non-ELF regular object. */
3169 if ((h
->root
.type
== bfd_link_hash_defined
3170 || h
->root
.type
== bfd_link_hash_defweak
)
3171 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3172 && (h
->root
.u
.def
.section
->owner
!= NULL
3173 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3174 != bfd_target_elf_flavour
)
3175 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3176 && (h
->elf_link_hash_flags
3177 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3178 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3181 /* If this is a final link, and the symbol was defined as a common
3182 symbol in a regular object file, and there was no definition in
3183 any dynamic object, then the linker will have allocated space for
3184 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3185 flag will not have been set. */
3186 if (h
->root
.type
== bfd_link_hash_defined
3187 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3188 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3189 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3190 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3191 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3193 /* If -Bsymbolic was used (which means to bind references to global
3194 symbols to the definition within the shared object), and this
3195 symbol was defined in a regular object, then it actually doesn't
3196 need a PLT entry. */
3197 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3198 && eif
->info
->shared
3199 && eif
->info
->symbolic
3200 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3202 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3203 h
->plt
.offset
= (bfd_vma
) -1;
3209 /* Make the backend pick a good value for a dynamic symbol. This is
3210 called via elf_link_hash_traverse, and also calls itself
3214 elf_adjust_dynamic_symbol (h
, data
)
3215 struct elf_link_hash_entry
*h
;
3218 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3220 struct elf_backend_data
*bed
;
3222 /* Ignore indirect symbols. These are added by the versioning code. */
3223 if (h
->root
.type
== bfd_link_hash_indirect
)
3226 /* Fix the symbol flags. */
3227 if (! elf_fix_symbol_flags (h
, eif
))
3230 /* If this symbol does not require a PLT entry, and it is not
3231 defined by a dynamic object, or is not referenced by a regular
3232 object, ignore it. We do have to handle a weak defined symbol,
3233 even if no regular object refers to it, if we decided to add it
3234 to the dynamic symbol table. FIXME: Do we normally need to worry
3235 about symbols which are defined by one dynamic object and
3236 referenced by another one? */
3237 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3238 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3239 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3240 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3241 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3243 h
->plt
.offset
= (bfd_vma
) -1;
3247 /* If we've already adjusted this symbol, don't do it again. This
3248 can happen via a recursive call. */
3249 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3252 /* Don't look at this symbol again. Note that we must set this
3253 after checking the above conditions, because we may look at a
3254 symbol once, decide not to do anything, and then get called
3255 recursively later after REF_REGULAR is set below. */
3256 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3258 /* If this is a weak definition, and we know a real definition, and
3259 the real symbol is not itself defined by a regular object file,
3260 then get a good value for the real definition. We handle the
3261 real symbol first, for the convenience of the backend routine.
3263 Note that there is a confusing case here. If the real definition
3264 is defined by a regular object file, we don't get the real symbol
3265 from the dynamic object, but we do get the weak symbol. If the
3266 processor backend uses a COPY reloc, then if some routine in the
3267 dynamic object changes the real symbol, we will not see that
3268 change in the corresponding weak symbol. This is the way other
3269 ELF linkers work as well, and seems to be a result of the shared
3272 I will clarify this issue. Most SVR4 shared libraries define the
3273 variable _timezone and define timezone as a weak synonym. The
3274 tzset call changes _timezone. If you write
3275 extern int timezone;
3277 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3278 you might expect that, since timezone is a synonym for _timezone,
3279 the same number will print both times. However, if the processor
3280 backend uses a COPY reloc, then actually timezone will be copied
3281 into your process image, and, since you define _timezone
3282 yourself, _timezone will not. Thus timezone and _timezone will
3283 wind up at different memory locations. The tzset call will set
3284 _timezone, leaving timezone unchanged. */
3286 if (h
->weakdef
!= NULL
)
3288 struct elf_link_hash_entry
*weakdef
;
3290 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3291 || h
->root
.type
== bfd_link_hash_defweak
);
3292 weakdef
= h
->weakdef
;
3293 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3294 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3295 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3296 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3298 /* This symbol is defined by a regular object file, so we
3299 will not do anything special. Clear weakdef for the
3300 convenience of the processor backend. */
3305 /* There is an implicit reference by a regular object file
3306 via the weak symbol. */
3307 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3308 if (h
->weakdef
->elf_link_hash_flags
3309 & ELF_LINK_HASH_REF_REGULAR_NONWEAK
)
3310 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
3311 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
3316 /* If a symbol has no type and no size and does not require a PLT
3317 entry, then we are probably about to do the wrong thing here: we
3318 are probably going to create a COPY reloc for an empty object.
3319 This case can arise when a shared object is built with assembly
3320 code, and the assembly code fails to set the symbol type. */
3322 && h
->type
== STT_NOTYPE
3323 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3324 (*_bfd_error_handler
)
3325 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3326 h
->root
.root
.string
);
3328 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3329 bed
= get_elf_backend_data (dynobj
);
3330 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3339 /* This routine is used to export all defined symbols into the dynamic
3340 symbol table. It is called via elf_link_hash_traverse. */
3343 elf_export_symbol (h
, data
)
3344 struct elf_link_hash_entry
*h
;
3347 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3349 /* Ignore indirect symbols. These are added by the versioning code. */
3350 if (h
->root
.type
== bfd_link_hash_indirect
)
3353 if (h
->dynindx
== -1
3354 && (h
->elf_link_hash_flags
3355 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3357 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3367 /* Look through the symbols which are defined in other shared
3368 libraries and referenced here. Update the list of version
3369 dependencies. This will be put into the .gnu.version_r section.
3370 This function is called via elf_link_hash_traverse. */
3373 elf_link_find_version_dependencies (h
, data
)
3374 struct elf_link_hash_entry
*h
;
3377 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3378 Elf_Internal_Verneed
*t
;
3379 Elf_Internal_Vernaux
*a
;
3381 /* We only care about symbols defined in shared objects with version
3383 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3384 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3386 || h
->verinfo
.verdef
== NULL
)
3389 /* See if we already know about this version. */
3390 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3392 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3395 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3396 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3402 /* This is a new version. Add it to tree we are building. */
3406 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3409 rinfo
->failed
= true;
3413 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3414 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3415 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3418 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3420 /* Note that we are copying a string pointer here, and testing it
3421 above. If bfd_elf_string_from_elf_section is ever changed to
3422 discard the string data when low in memory, this will have to be
3424 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3426 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3427 a
->vna_nextptr
= t
->vn_auxptr
;
3429 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3432 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3439 /* Figure out appropriate versions for all the symbols. We may not
3440 have the version number script until we have read all of the input
3441 files, so until that point we don't know which symbols should be
3442 local. This function is called via elf_link_hash_traverse. */
3445 elf_link_assign_sym_version (h
, data
)
3446 struct elf_link_hash_entry
*h
;
3449 struct elf_assign_sym_version_info
*sinfo
=
3450 (struct elf_assign_sym_version_info
*) data
;
3451 struct bfd_link_info
*info
= sinfo
->info
;
3452 struct elf_info_failed eif
;
3455 /* Fix the symbol flags. */
3458 if (! elf_fix_symbol_flags (h
, &eif
))
3461 sinfo
->failed
= true;
3465 /* We only need version numbers for symbols defined in regular
3467 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3470 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3471 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3473 struct bfd_elf_version_tree
*t
;
3478 /* There are two consecutive ELF_VER_CHR characters if this is
3479 not a hidden symbol. */
3481 if (*p
== ELF_VER_CHR
)
3487 /* If there is no version string, we can just return out. */
3491 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3495 /* Look for the version. If we find it, it is no longer weak. */
3496 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3498 if (strcmp (t
->name
, p
) == 0)
3502 struct bfd_elf_version_expr
*d
;
3504 len
= p
- h
->root
.root
.string
;
3505 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3508 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3509 alc
[len
- 1] = '\0';
3510 if (alc
[len
- 2] == ELF_VER_CHR
)
3511 alc
[len
- 2] = '\0';
3513 h
->verinfo
.vertree
= t
;
3517 if (t
->globals
!= NULL
)
3519 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3520 if ((*d
->match
) (d
, alc
))
3524 /* See if there is anything to force this symbol to
3526 if (d
== NULL
&& t
->locals
!= NULL
)
3528 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3530 if ((*d
->match
) (d
, alc
))
3532 if (h
->dynindx
!= -1
3534 && ! sinfo
->export_dynamic
)
3536 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3537 h
->elf_link_hash_flags
&=~
3538 ELF_LINK_HASH_NEEDS_PLT
;
3540 h
->plt
.offset
= (bfd_vma
) -1;
3541 /* FIXME: The name of the symbol has
3542 already been recorded in the dynamic
3543 string table section. */
3551 bfd_release (sinfo
->output_bfd
, alc
);
3556 /* If we are building an application, we need to create a
3557 version node for this version. */
3558 if (t
== NULL
&& ! info
->shared
)
3560 struct bfd_elf_version_tree
**pp
;
3563 /* If we aren't going to export this symbol, we don't need
3564 to worry about it. */
3565 if (h
->dynindx
== -1)
3568 t
= ((struct bfd_elf_version_tree
*)
3569 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3572 sinfo
->failed
= true;
3581 t
->name_indx
= (unsigned int) -1;
3585 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3587 t
->vernum
= version_index
;
3591 h
->verinfo
.vertree
= t
;
3595 /* We could not find the version for a symbol when
3596 generating a shared archive. Return an error. */
3597 (*_bfd_error_handler
)
3598 (_("%s: undefined versioned symbol name %s"),
3599 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3600 bfd_set_error (bfd_error_bad_value
);
3601 sinfo
->failed
= true;
3606 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3609 /* If we don't have a version for this symbol, see if we can find
3611 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3613 struct bfd_elf_version_tree
*t
;
3614 struct bfd_elf_version_tree
*deflt
;
3615 struct bfd_elf_version_expr
*d
;
3617 /* See if can find what version this symbol is in. If the
3618 symbol is supposed to be local, then don't actually register
3621 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3623 if (t
->globals
!= NULL
)
3625 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3627 if ((*d
->match
) (d
, h
->root
.root
.string
))
3629 h
->verinfo
.vertree
= t
;
3638 if (t
->locals
!= NULL
)
3640 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3642 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3644 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3646 h
->verinfo
.vertree
= t
;
3647 if (h
->dynindx
!= -1
3649 && ! sinfo
->export_dynamic
)
3651 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3652 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3654 h
->plt
.offset
= (bfd_vma
) -1;
3655 /* FIXME: The name of the symbol has already
3656 been recorded in the dynamic string table
3668 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3670 h
->verinfo
.vertree
= deflt
;
3671 if (h
->dynindx
!= -1
3673 && ! sinfo
->export_dynamic
)
3675 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3676 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3678 h
->plt
.offset
= (bfd_vma
) -1;
3679 /* FIXME: The name of the symbol has already been
3680 recorded in the dynamic string table section. */
3688 /* Final phase of ELF linker. */
3690 /* A structure we use to avoid passing large numbers of arguments. */
3692 struct elf_final_link_info
3694 /* General link information. */
3695 struct bfd_link_info
*info
;
3698 /* Symbol string table. */
3699 struct bfd_strtab_hash
*symstrtab
;
3700 /* .dynsym section. */
3701 asection
*dynsym_sec
;
3702 /* .hash section. */
3704 /* symbol version section (.gnu.version). */
3705 asection
*symver_sec
;
3706 /* Buffer large enough to hold contents of any section. */
3708 /* Buffer large enough to hold external relocs of any section. */
3709 PTR external_relocs
;
3710 /* Buffer large enough to hold internal relocs of any section. */
3711 Elf_Internal_Rela
*internal_relocs
;
3712 /* Buffer large enough to hold external local symbols of any input
3714 Elf_External_Sym
*external_syms
;
3715 /* Buffer large enough to hold internal local symbols of any input
3717 Elf_Internal_Sym
*internal_syms
;
3718 /* Array large enough to hold a symbol index for each local symbol
3719 of any input BFD. */
3721 /* Array large enough to hold a section pointer for each local
3722 symbol of any input BFD. */
3723 asection
**sections
;
3724 /* Buffer to hold swapped out symbols. */
3725 Elf_External_Sym
*symbuf
;
3726 /* Number of swapped out symbols in buffer. */
3727 size_t symbuf_count
;
3728 /* Number of symbols which fit in symbuf. */
3732 static boolean elf_link_output_sym
3733 PARAMS ((struct elf_final_link_info
*, const char *,
3734 Elf_Internal_Sym
*, asection
*));
3735 static boolean elf_link_flush_output_syms
3736 PARAMS ((struct elf_final_link_info
*));
3737 static boolean elf_link_output_extsym
3738 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3739 static boolean elf_link_input_bfd
3740 PARAMS ((struct elf_final_link_info
*, bfd
*));
3741 static boolean elf_reloc_link_order
3742 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3743 struct bfd_link_order
*));
3745 /* This struct is used to pass information to elf_link_output_extsym. */
3747 struct elf_outext_info
3751 struct elf_final_link_info
*finfo
;
3754 /* Compute the size of, and allocate space for, REL_HDR which is the
3755 section header for a section containing relocations for O. */
3758 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
3760 Elf_Internal_Shdr
*rel_hdr
;
3763 register struct elf_link_hash_entry
**p
, **pend
;
3764 unsigned reloc_count
;
3766 /* Figure out how many relocations there will be. */
3767 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
3768 reloc_count
= elf_section_data (o
)->rel_count
;
3770 reloc_count
= elf_section_data (o
)->rel_count2
;
3772 /* That allows us to calculate the size of the section. */
3773 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
3775 /* The contents field must last into write_object_contents, so we
3776 allocate it with bfd_alloc rather than malloc. */
3777 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3778 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3781 /* We only allocate one set of hash entries, so we only do it the
3782 first time we are called. */
3783 if (elf_section_data (o
)->rel_hashes
== NULL
)
3785 p
= ((struct elf_link_hash_entry
**)
3786 bfd_malloc (o
->reloc_count
3787 * sizeof (struct elf_link_hash_entry
*)));
3788 if (p
== NULL
&& o
->reloc_count
!= 0)
3791 elf_section_data (o
)->rel_hashes
= p
;
3792 pend
= p
+ o
->reloc_count
;
3793 for (; p
< pend
; p
++)
3800 /* When performing a relocateable link, the input relocations are
3801 preserved. But, if they reference global symbols, the indices
3802 referenced must be updated. Update all the relocations in
3803 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
3806 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
3808 Elf_Internal_Shdr
*rel_hdr
;
3810 struct elf_link_hash_entry
**rel_hash
;
3814 for (i
= 0; i
< count
; i
++, rel_hash
++)
3816 if (*rel_hash
== NULL
)
3819 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3821 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3823 Elf_External_Rel
*erel
;
3824 Elf_Internal_Rel irel
;
3826 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3827 elf_swap_reloc_in (abfd
, erel
, &irel
);
3828 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3829 ELF_R_TYPE (irel
.r_info
));
3830 elf_swap_reloc_out (abfd
, &irel
, erel
);
3834 Elf_External_Rela
*erela
;
3835 Elf_Internal_Rela irela
;
3837 BFD_ASSERT (rel_hdr
->sh_entsize
3838 == sizeof (Elf_External_Rela
));
3840 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3841 elf_swap_reloca_in (abfd
, erela
, &irela
);
3842 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3843 ELF_R_TYPE (irela
.r_info
));
3844 elf_swap_reloca_out (abfd
, &irela
, erela
);
3849 /* Do the final step of an ELF link. */
3852 elf_bfd_final_link (abfd
, info
)
3854 struct bfd_link_info
*info
;
3858 struct elf_final_link_info finfo
;
3859 register asection
*o
;
3860 register struct bfd_link_order
*p
;
3862 size_t max_contents_size
;
3863 size_t max_external_reloc_size
;
3864 size_t max_internal_reloc_count
;
3865 size_t max_sym_count
;
3867 Elf_Internal_Sym elfsym
;
3869 Elf_Internal_Shdr
*symtab_hdr
;
3870 Elf_Internal_Shdr
*symstrtab_hdr
;
3871 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3872 struct elf_outext_info eoinfo
;
3875 abfd
->flags
|= DYNAMIC
;
3877 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3878 dynobj
= elf_hash_table (info
)->dynobj
;
3881 finfo
.output_bfd
= abfd
;
3882 finfo
.symstrtab
= elf_stringtab_init ();
3883 if (finfo
.symstrtab
== NULL
)
3888 finfo
.dynsym_sec
= NULL
;
3889 finfo
.hash_sec
= NULL
;
3890 finfo
.symver_sec
= NULL
;
3894 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3895 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3896 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3897 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3898 /* Note that it is OK if symver_sec is NULL. */
3901 finfo
.contents
= NULL
;
3902 finfo
.external_relocs
= NULL
;
3903 finfo
.internal_relocs
= NULL
;
3904 finfo
.external_syms
= NULL
;
3905 finfo
.internal_syms
= NULL
;
3906 finfo
.indices
= NULL
;
3907 finfo
.sections
= NULL
;
3908 finfo
.symbuf
= NULL
;
3909 finfo
.symbuf_count
= 0;
3911 /* Count up the number of relocations we will output for each output
3912 section, so that we know the sizes of the reloc sections. We
3913 also figure out some maximum sizes. */
3914 max_contents_size
= 0;
3915 max_external_reloc_size
= 0;
3916 max_internal_reloc_count
= 0;
3918 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3922 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3924 if (p
->type
== bfd_section_reloc_link_order
3925 || p
->type
== bfd_symbol_reloc_link_order
)
3927 else if (p
->type
== bfd_indirect_link_order
)
3931 sec
= p
->u
.indirect
.section
;
3933 /* Mark all sections which are to be included in the
3934 link. This will normally be every section. We need
3935 to do this so that we can identify any sections which
3936 the linker has decided to not include. */
3937 sec
->linker_mark
= true;
3939 if (info
->relocateable
)
3940 o
->reloc_count
+= sec
->reloc_count
;
3942 if (sec
->_raw_size
> max_contents_size
)
3943 max_contents_size
= sec
->_raw_size
;
3944 if (sec
->_cooked_size
> max_contents_size
)
3945 max_contents_size
= sec
->_cooked_size
;
3947 /* We are interested in just local symbols, not all
3949 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3950 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3954 if (elf_bad_symtab (sec
->owner
))
3955 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3956 / sizeof (Elf_External_Sym
));
3958 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3960 if (sym_count
> max_sym_count
)
3961 max_sym_count
= sym_count
;
3963 if ((sec
->flags
& SEC_RELOC
) != 0)
3967 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3968 if (ext_size
> max_external_reloc_size
)
3969 max_external_reloc_size
= ext_size
;
3970 if (sec
->reloc_count
> max_internal_reloc_count
)
3971 max_internal_reloc_count
= sec
->reloc_count
;
3977 if (o
->reloc_count
> 0)
3978 o
->flags
|= SEC_RELOC
;
3981 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3982 set it (this is probably a bug) and if it is set
3983 assign_section_numbers will create a reloc section. */
3984 o
->flags
&=~ SEC_RELOC
;
3987 /* If the SEC_ALLOC flag is not set, force the section VMA to
3988 zero. This is done in elf_fake_sections as well, but forcing
3989 the VMA to 0 here will ensure that relocs against these
3990 sections are handled correctly. */
3991 if ((o
->flags
& SEC_ALLOC
) == 0
3992 && ! o
->user_set_vma
)
3996 /* Figure out the file positions for everything but the symbol table
3997 and the relocs. We set symcount to force assign_section_numbers
3998 to create a symbol table. */
3999 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
4000 BFD_ASSERT (! abfd
->output_has_begun
);
4001 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
4004 /* Figure out how many relocations we will have in each section.
4005 Just using RELOC_COUNT isn't good enough since that doesn't
4006 maintain a separate value for REL vs. RELA relocations. */
4007 if (info
->relocateable
)
4008 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4009 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4011 asection
* output_section
= o
->output_section
;
4013 if (output_section
&& (o
->flags
& SEC_RELOC
) != 0)
4015 struct bfd_elf_section_data
*esdi
4016 = elf_section_data (o
);
4017 struct bfd_elf_section_data
*esdo
4018 = elf_section_data (output_section
);
4020 esdo
->rel_count
+= (esdi
->rel_hdr
.sh_size
4021 / esdi
->rel_hdr
.sh_entsize
);
4023 esdo
->rel_count2
+= (esdi
->rel_hdr2
->sh_size
4024 / esdi
->rel_hdr2
->sh_entsize
);
4028 /* That created the reloc sections. Set their sizes, and assign
4029 them file positions, and allocate some buffers. */
4030 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4032 if ((o
->flags
& SEC_RELOC
) != 0)
4034 if (!elf_link_size_reloc_section (abfd
,
4035 &elf_section_data (o
)->rel_hdr
,
4039 if (elf_section_data (o
)->rel_hdr2
4040 && !elf_link_size_reloc_section (abfd
,
4041 elf_section_data (o
)->rel_hdr2
,
4046 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4047 to count upwards while actually outputting the relocations. */
4048 elf_section_data (o
)->rel_count
= 0;
4049 elf_section_data (o
)->rel_count2
= 0;
4052 _bfd_elf_assign_file_positions_for_relocs (abfd
);
4054 /* We have now assigned file positions for all the sections except
4055 .symtab and .strtab. We start the .symtab section at the current
4056 file position, and write directly to it. We build the .strtab
4057 section in memory. */
4058 bfd_get_symcount (abfd
) = 0;
4059 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4060 /* sh_name is set in prep_headers. */
4061 symtab_hdr
->sh_type
= SHT_SYMTAB
;
4062 symtab_hdr
->sh_flags
= 0;
4063 symtab_hdr
->sh_addr
= 0;
4064 symtab_hdr
->sh_size
= 0;
4065 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
4066 /* sh_link is set in assign_section_numbers. */
4067 /* sh_info is set below. */
4068 /* sh_offset is set just below. */
4069 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
4071 off
= elf_tdata (abfd
)->next_file_pos
;
4072 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
4074 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4075 incorrect. We do not yet know the size of the .symtab section.
4076 We correct next_file_pos below, after we do know the size. */
4078 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4079 continuously seeking to the right position in the file. */
4080 if (! info
->keep_memory
|| max_sym_count
< 20)
4081 finfo
.symbuf_size
= 20;
4083 finfo
.symbuf_size
= max_sym_count
;
4084 finfo
.symbuf
= ((Elf_External_Sym
*)
4085 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
4086 if (finfo
.symbuf
== NULL
)
4089 /* Start writing out the symbol table. The first symbol is always a
4091 if (info
->strip
!= strip_all
|| info
->relocateable
)
4093 elfsym
.st_value
= 0;
4096 elfsym
.st_other
= 0;
4097 elfsym
.st_shndx
= SHN_UNDEF
;
4098 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4099 &elfsym
, bfd_und_section_ptr
))
4104 /* Some standard ELF linkers do this, but we don't because it causes
4105 bootstrap comparison failures. */
4106 /* Output a file symbol for the output file as the second symbol.
4107 We output this even if we are discarding local symbols, although
4108 I'm not sure if this is correct. */
4109 elfsym
.st_value
= 0;
4111 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
4112 elfsym
.st_other
= 0;
4113 elfsym
.st_shndx
= SHN_ABS
;
4114 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
4115 &elfsym
, bfd_abs_section_ptr
))
4119 /* Output a symbol for each section. We output these even if we are
4120 discarding local symbols, since they are used for relocs. These
4121 symbols have no names. We store the index of each one in the
4122 index field of the section, so that we can find it again when
4123 outputting relocs. */
4124 if (info
->strip
!= strip_all
|| info
->relocateable
)
4127 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4128 elfsym
.st_other
= 0;
4129 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4131 o
= section_from_elf_index (abfd
, i
);
4133 o
->target_index
= bfd_get_symcount (abfd
);
4134 elfsym
.st_shndx
= i
;
4135 if (info
->relocateable
|| o
== NULL
)
4136 elfsym
.st_value
= 0;
4138 elfsym
.st_value
= o
->vma
;
4139 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4145 /* Allocate some memory to hold information read in from the input
4147 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
4148 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
4149 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
4150 bfd_malloc (max_internal_reloc_count
4151 * sizeof (Elf_Internal_Rela
)
4152 * bed
->s
->int_rels_per_ext_rel
));
4153 finfo
.external_syms
= ((Elf_External_Sym
*)
4154 bfd_malloc (max_sym_count
4155 * sizeof (Elf_External_Sym
)));
4156 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
4157 bfd_malloc (max_sym_count
4158 * sizeof (Elf_Internal_Sym
)));
4159 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
4160 finfo
.sections
= ((asection
**)
4161 bfd_malloc (max_sym_count
* sizeof (asection
*)));
4162 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
4163 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
4164 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
4165 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
4166 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
4167 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
4168 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
4171 /* Since ELF permits relocations to be against local symbols, we
4172 must have the local symbols available when we do the relocations.
4173 Since we would rather only read the local symbols once, and we
4174 would rather not keep them in memory, we handle all the
4175 relocations for a single input file at the same time.
4177 Unfortunately, there is no way to know the total number of local
4178 symbols until we have seen all of them, and the local symbol
4179 indices precede the global symbol indices. This means that when
4180 we are generating relocateable output, and we see a reloc against
4181 a global symbol, we can not know the symbol index until we have
4182 finished examining all the local symbols to see which ones we are
4183 going to output. To deal with this, we keep the relocations in
4184 memory, and don't output them until the end of the link. This is
4185 an unfortunate waste of memory, but I don't see a good way around
4186 it. Fortunately, it only happens when performing a relocateable
4187 link, which is not the common case. FIXME: If keep_memory is set
4188 we could write the relocs out and then read them again; I don't
4189 know how bad the memory loss will be. */
4191 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4192 sub
->output_has_begun
= false;
4193 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4195 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4197 if (p
->type
== bfd_indirect_link_order
4198 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4199 == bfd_target_elf_flavour
))
4201 sub
= p
->u
.indirect
.section
->owner
;
4202 if (! sub
->output_has_begun
)
4204 if (! elf_link_input_bfd (&finfo
, sub
))
4206 sub
->output_has_begun
= true;
4209 else if (p
->type
== bfd_section_reloc_link_order
4210 || p
->type
== bfd_symbol_reloc_link_order
)
4212 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4217 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4223 /* That wrote out all the local symbols. Finish up the symbol table
4224 with the global symbols. */
4226 if (info
->strip
!= strip_all
&& info
->shared
)
4228 /* Output any global symbols that got converted to local in a
4229 version script. We do this in a separate step since ELF
4230 requires all local symbols to appear prior to any global
4231 symbols. FIXME: We should only do this if some global
4232 symbols were, in fact, converted to become local. FIXME:
4233 Will this work correctly with the Irix 5 linker? */
4234 eoinfo
.failed
= false;
4235 eoinfo
.finfo
= &finfo
;
4236 eoinfo
.localsyms
= true;
4237 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4243 /* The sh_info field records the index of the first non local symbol. */
4244 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4248 Elf_Internal_Sym sym
;
4249 Elf_External_Sym
*dynsym
=
4250 (Elf_External_Sym
*)finfo
.dynsym_sec
->contents
;
4251 unsigned long last_local
= 0;
4253 /* Write out the section symbols for the output sections. */
4260 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4263 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4266 indx
= elf_section_data (s
)->this_idx
;
4267 BFD_ASSERT (indx
> 0);
4268 sym
.st_shndx
= indx
;
4269 sym
.st_value
= s
->vma
;
4271 elf_swap_symbol_out (abfd
, &sym
,
4272 dynsym
+ elf_section_data (s
)->dynindx
);
4275 last_local
= bfd_count_sections (abfd
);
4278 /* Write out the local dynsyms. */
4279 if (elf_hash_table (info
)->dynlocal
)
4281 struct elf_link_local_dynamic_entry
*e
;
4282 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
4286 sym
.st_size
= e
->isym
.st_size
;
4287 sym
.st_other
= e
->isym
.st_other
;
4289 /* Copy the internal symbol as is.
4290 Note that we saved a word of storage and overwrote
4291 the original st_name with the dynstr_index. */
4294 if (e
->isym
.st_shndx
> 0 && e
->isym
.st_shndx
< SHN_LORESERVE
)
4296 s
= bfd_section_from_elf_index (e
->input_bfd
,
4300 elf_section_data (s
->output_section
)->this_idx
;
4301 sym
.st_value
= (s
->output_section
->vma
4303 + e
->isym
.st_value
);
4306 if (last_local
< e
->dynindx
)
4307 last_local
= e
->dynindx
;
4309 elf_swap_symbol_out (abfd
, &sym
, dynsym
+ e
->dynindx
);
4313 elf_section_data (finfo
.dynsym_sec
->output_section
)
4314 ->this_hdr
.sh_info
= last_local
+ 1;
4317 /* We get the global symbols from the hash table. */
4318 eoinfo
.failed
= false;
4319 eoinfo
.localsyms
= false;
4320 eoinfo
.finfo
= &finfo
;
4321 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4326 /* If backend needs to output some symbols not present in the hash
4327 table, do it now. */
4328 if (bed
->elf_backend_output_arch_syms
)
4330 if (! (*bed
->elf_backend_output_arch_syms
)
4331 (abfd
, info
, (PTR
) &finfo
,
4332 (boolean (*) PARAMS ((PTR
, const char *,
4333 Elf_Internal_Sym
*, asection
*)))
4334 elf_link_output_sym
))
4338 /* Flush all symbols to the file. */
4339 if (! elf_link_flush_output_syms (&finfo
))
4342 /* Now we know the size of the symtab section. */
4343 off
+= symtab_hdr
->sh_size
;
4345 /* Finish up and write out the symbol string table (.strtab)
4347 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4348 /* sh_name was set in prep_headers. */
4349 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4350 symstrtab_hdr
->sh_flags
= 0;
4351 symstrtab_hdr
->sh_addr
= 0;
4352 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4353 symstrtab_hdr
->sh_entsize
= 0;
4354 symstrtab_hdr
->sh_link
= 0;
4355 symstrtab_hdr
->sh_info
= 0;
4356 /* sh_offset is set just below. */
4357 symstrtab_hdr
->sh_addralign
= 1;
4359 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4360 elf_tdata (abfd
)->next_file_pos
= off
;
4362 if (bfd_get_symcount (abfd
) > 0)
4364 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4365 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4369 /* Adjust the relocs to have the correct symbol indices. */
4370 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4372 if ((o
->flags
& SEC_RELOC
) == 0)
4375 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
4376 elf_section_data (o
)->rel_count
,
4377 elf_section_data (o
)->rel_hashes
);
4378 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
4379 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
4380 elf_section_data (o
)->rel_count2
,
4381 (elf_section_data (o
)->rel_hashes
4382 + elf_section_data (o
)->rel_count
));
4384 /* Set the reloc_count field to 0 to prevent write_relocs from
4385 trying to swap the relocs out itself. */
4389 /* If we are linking against a dynamic object, or generating a
4390 shared library, finish up the dynamic linking information. */
4393 Elf_External_Dyn
*dyncon
, *dynconend
;
4395 /* Fix up .dynamic entries. */
4396 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4397 BFD_ASSERT (o
!= NULL
);
4399 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4400 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4401 for (; dyncon
< dynconend
; dyncon
++)
4403 Elf_Internal_Dyn dyn
;
4407 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4414 name
= info
->init_function
;
4417 name
= info
->fini_function
;
4420 struct elf_link_hash_entry
*h
;
4422 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4423 false, false, true);
4425 && (h
->root
.type
== bfd_link_hash_defined
4426 || h
->root
.type
== bfd_link_hash_defweak
))
4428 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4429 o
= h
->root
.u
.def
.section
;
4430 if (o
->output_section
!= NULL
)
4431 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4432 + o
->output_offset
);
4435 /* The symbol is imported from another shared
4436 library and does not apply to this one. */
4440 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4455 name
= ".gnu.version_d";
4458 name
= ".gnu.version_r";
4461 name
= ".gnu.version";
4463 o
= bfd_get_section_by_name (abfd
, name
);
4464 BFD_ASSERT (o
!= NULL
);
4465 dyn
.d_un
.d_ptr
= o
->vma
;
4466 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4473 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4478 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4480 Elf_Internal_Shdr
*hdr
;
4482 hdr
= elf_elfsections (abfd
)[i
];
4483 if (hdr
->sh_type
== type
4484 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4486 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4487 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4490 if (dyn
.d_un
.d_val
== 0
4491 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4492 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4496 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4502 /* If we have created any dynamic sections, then output them. */
4505 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4508 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4510 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4511 || o
->_raw_size
== 0)
4513 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4515 /* At this point, we are only interested in sections
4516 created by elf_link_create_dynamic_sections. */
4519 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4521 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4523 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4524 o
->contents
, o
->output_offset
,
4532 /* The contents of the .dynstr section are actually in a
4534 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4535 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4536 || ! _bfd_stringtab_emit (abfd
,
4537 elf_hash_table (info
)->dynstr
))
4543 /* If we have optimized stabs strings, output them. */
4544 if (elf_hash_table (info
)->stab_info
!= NULL
)
4546 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4550 if (finfo
.symstrtab
!= NULL
)
4551 _bfd_stringtab_free (finfo
.symstrtab
);
4552 if (finfo
.contents
!= NULL
)
4553 free (finfo
.contents
);
4554 if (finfo
.external_relocs
!= NULL
)
4555 free (finfo
.external_relocs
);
4556 if (finfo
.internal_relocs
!= NULL
)
4557 free (finfo
.internal_relocs
);
4558 if (finfo
.external_syms
!= NULL
)
4559 free (finfo
.external_syms
);
4560 if (finfo
.internal_syms
!= NULL
)
4561 free (finfo
.internal_syms
);
4562 if (finfo
.indices
!= NULL
)
4563 free (finfo
.indices
);
4564 if (finfo
.sections
!= NULL
)
4565 free (finfo
.sections
);
4566 if (finfo
.symbuf
!= NULL
)
4567 free (finfo
.symbuf
);
4568 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4570 if ((o
->flags
& SEC_RELOC
) != 0
4571 && elf_section_data (o
)->rel_hashes
!= NULL
)
4572 free (elf_section_data (o
)->rel_hashes
);
4575 elf_tdata (abfd
)->linker
= true;
4580 if (finfo
.symstrtab
!= NULL
)
4581 _bfd_stringtab_free (finfo
.symstrtab
);
4582 if (finfo
.contents
!= NULL
)
4583 free (finfo
.contents
);
4584 if (finfo
.external_relocs
!= NULL
)
4585 free (finfo
.external_relocs
);
4586 if (finfo
.internal_relocs
!= NULL
)
4587 free (finfo
.internal_relocs
);
4588 if (finfo
.external_syms
!= NULL
)
4589 free (finfo
.external_syms
);
4590 if (finfo
.internal_syms
!= NULL
)
4591 free (finfo
.internal_syms
);
4592 if (finfo
.indices
!= NULL
)
4593 free (finfo
.indices
);
4594 if (finfo
.sections
!= NULL
)
4595 free (finfo
.sections
);
4596 if (finfo
.symbuf
!= NULL
)
4597 free (finfo
.symbuf
);
4598 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4600 if ((o
->flags
& SEC_RELOC
) != 0
4601 && elf_section_data (o
)->rel_hashes
!= NULL
)
4602 free (elf_section_data (o
)->rel_hashes
);
4608 /* Add a symbol to the output symbol table. */
4611 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4612 struct elf_final_link_info
*finfo
;
4614 Elf_Internal_Sym
*elfsym
;
4615 asection
*input_sec
;
4617 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4618 struct bfd_link_info
*info
,
4623 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4624 elf_backend_link_output_symbol_hook
;
4625 if (output_symbol_hook
!= NULL
)
4627 if (! ((*output_symbol_hook
)
4628 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4632 if (name
== (const char *) NULL
|| *name
== '\0')
4633 elfsym
->st_name
= 0;
4634 else if (input_sec
->flags
& SEC_EXCLUDE
)
4635 elfsym
->st_name
= 0;
4638 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4641 if (elfsym
->st_name
== (unsigned long) -1)
4645 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4647 if (! elf_link_flush_output_syms (finfo
))
4651 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4652 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4653 ++finfo
->symbuf_count
;
4655 ++ bfd_get_symcount (finfo
->output_bfd
);
4660 /* Flush the output symbols to the file. */
4663 elf_link_flush_output_syms (finfo
)
4664 struct elf_final_link_info
*finfo
;
4666 if (finfo
->symbuf_count
> 0)
4668 Elf_Internal_Shdr
*symtab
;
4670 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4672 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4674 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4675 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4676 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4679 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4681 finfo
->symbuf_count
= 0;
4687 /* Add an external symbol to the symbol table. This is called from
4688 the hash table traversal routine. When generating a shared object,
4689 we go through the symbol table twice. The first time we output
4690 anything that might have been forced to local scope in a version
4691 script. The second time we output the symbols that are still
4695 elf_link_output_extsym (h
, data
)
4696 struct elf_link_hash_entry
*h
;
4699 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4700 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4702 Elf_Internal_Sym sym
;
4703 asection
*input_sec
;
4705 /* Decide whether to output this symbol in this pass. */
4706 if (eoinfo
->localsyms
)
4708 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4713 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4717 /* If we are not creating a shared library, and this symbol is
4718 referenced by a shared library but is not defined anywhere, then
4719 warn that it is undefined. If we do not do this, the runtime
4720 linker will complain that the symbol is undefined when the
4721 program is run. We don't have to worry about symbols that are
4722 referenced by regular files, because we will already have issued
4723 warnings for them. */
4724 if (! finfo
->info
->relocateable
4725 && ! (finfo
->info
->shared
4726 && !finfo
->info
->no_undefined
)
4727 && h
->root
.type
== bfd_link_hash_undefined
4728 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4729 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4731 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4732 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4733 (asection
*) NULL
, 0)))
4735 eoinfo
->failed
= true;
4740 /* We don't want to output symbols that have never been mentioned by
4741 a regular file, or that we have been told to strip. However, if
4742 h->indx is set to -2, the symbol is used by a reloc and we must
4746 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4747 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4748 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4749 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4751 else if (finfo
->info
->strip
== strip_all
4752 || (finfo
->info
->strip
== strip_some
4753 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4754 h
->root
.root
.string
,
4755 false, false) == NULL
))
4760 /* If we're stripping it, and it's not a dynamic symbol, there's
4761 nothing else to do. */
4762 if (strip
&& h
->dynindx
== -1)
4766 sym
.st_size
= h
->size
;
4767 sym
.st_other
= h
->other
;
4768 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4769 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4770 else if (h
->root
.type
== bfd_link_hash_undefweak
4771 || h
->root
.type
== bfd_link_hash_defweak
)
4772 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4774 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4776 switch (h
->root
.type
)
4779 case bfd_link_hash_new
:
4783 case bfd_link_hash_undefined
:
4784 input_sec
= bfd_und_section_ptr
;
4785 sym
.st_shndx
= SHN_UNDEF
;
4788 case bfd_link_hash_undefweak
:
4789 input_sec
= bfd_und_section_ptr
;
4790 sym
.st_shndx
= SHN_UNDEF
;
4793 case bfd_link_hash_defined
:
4794 case bfd_link_hash_defweak
:
4796 input_sec
= h
->root
.u
.def
.section
;
4797 if (input_sec
->output_section
!= NULL
)
4800 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4801 input_sec
->output_section
);
4802 if (sym
.st_shndx
== (unsigned short) -1)
4804 (*_bfd_error_handler
)
4805 (_("%s: could not find output section %s for input section %s"),
4806 bfd_get_filename (finfo
->output_bfd
),
4807 input_sec
->output_section
->name
,
4809 eoinfo
->failed
= true;
4813 /* ELF symbols in relocateable files are section relative,
4814 but in nonrelocateable files they are virtual
4816 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4817 if (! finfo
->info
->relocateable
)
4818 sym
.st_value
+= input_sec
->output_section
->vma
;
4822 BFD_ASSERT (input_sec
->owner
== NULL
4823 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4824 sym
.st_shndx
= SHN_UNDEF
;
4825 input_sec
= bfd_und_section_ptr
;
4830 case bfd_link_hash_common
:
4831 input_sec
= h
->root
.u
.c
.p
->section
;
4832 sym
.st_shndx
= SHN_COMMON
;
4833 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4836 case bfd_link_hash_indirect
:
4837 /* These symbols are created by symbol versioning. They point
4838 to the decorated version of the name. For example, if the
4839 symbol foo@@GNU_1.2 is the default, which should be used when
4840 foo is used with no version, then we add an indirect symbol
4841 foo which points to foo@@GNU_1.2. We ignore these symbols,
4842 since the indirected symbol is already in the hash table. If
4843 the indirect symbol is non-ELF, fall through and output it. */
4844 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4848 case bfd_link_hash_warning
:
4849 /* We can't represent these symbols in ELF, although a warning
4850 symbol may have come from a .gnu.warning.SYMBOL section. We
4851 just put the target symbol in the hash table. If the target
4852 symbol does not really exist, don't do anything. */
4853 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4855 return (elf_link_output_extsym
4856 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4859 /* Give the processor backend a chance to tweak the symbol value,
4860 and also to finish up anything that needs to be done for this
4862 if ((h
->dynindx
!= -1
4863 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4864 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4866 struct elf_backend_data
*bed
;
4868 bed
= get_elf_backend_data (finfo
->output_bfd
);
4869 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4870 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4872 eoinfo
->failed
= true;
4877 /* If we are marking the symbol as undefined, and there are no
4878 non-weak references to this symbol from a regular object, then
4879 mark the symbol as weak undefined; if there are non-weak
4880 references, mark the symbol as strong. We can't do this earlier,
4881 because it might not be marked as undefined until the
4882 finish_dynamic_symbol routine gets through with it. */
4883 if (sym
.st_shndx
== SHN_UNDEF
4884 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
4885 && (ELF_ST_BIND(sym
.st_info
) == STB_GLOBAL
4886 || ELF_ST_BIND(sym
.st_info
) == STB_WEAK
))
4890 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
4891 bindtype
= STB_GLOBAL
;
4893 bindtype
= STB_WEAK
;
4894 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
4897 /* If this symbol should be put in the .dynsym section, then put it
4898 there now. We have already know the symbol index. We also fill
4899 in the entry in the .hash section. */
4900 if (h
->dynindx
!= -1
4901 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4905 size_t hash_entry_size
;
4906 bfd_byte
*bucketpos
;
4909 sym
.st_name
= h
->dynstr_index
;
4911 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4912 (PTR
) (((Elf_External_Sym
*)
4913 finfo
->dynsym_sec
->contents
)
4916 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4917 bucket
= h
->elf_hash_value
% bucketcount
;
4919 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
4920 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4921 + (bucket
+ 2) * hash_entry_size
);
4922 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
4923 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4924 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
4925 ((bfd_byte
*) finfo
->hash_sec
->contents
4926 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
4928 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4930 Elf_Internal_Versym iversym
;
4932 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4934 if (h
->verinfo
.verdef
== NULL
)
4935 iversym
.vs_vers
= 0;
4937 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4941 if (h
->verinfo
.vertree
== NULL
)
4942 iversym
.vs_vers
= 1;
4944 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4947 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4948 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4950 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4951 (((Elf_External_Versym
*)
4952 finfo
->symver_sec
->contents
)
4957 /* If we're stripping it, then it was just a dynamic symbol, and
4958 there's nothing else to do. */
4962 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
4964 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4966 eoinfo
->failed
= true;
4973 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
4974 originated from the section given by INPUT_REL_HDR) to the
4978 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
4981 asection
*input_section
;
4982 Elf_Internal_Shdr
*input_rel_hdr
;
4983 Elf_Internal_Rela
*internal_relocs
;
4985 Elf_Internal_Rela
*irela
;
4986 Elf_Internal_Rela
*irelaend
;
4987 Elf_Internal_Shdr
*output_rel_hdr
;
4988 asection
*output_section
;
4989 unsigned int *rel_countp
= NULL
;
4991 output_section
= input_section
->output_section
;
4992 output_rel_hdr
= NULL
;
4994 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
4995 == input_rel_hdr
->sh_entsize
)
4997 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
4998 rel_countp
= &elf_section_data (output_section
)->rel_count
;
5000 else if (elf_section_data (output_section
)->rel_hdr2
5001 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
5002 == input_rel_hdr
->sh_entsize
))
5004 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
5005 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
5008 BFD_ASSERT (output_rel_hdr
!= NULL
);
5010 irela
= internal_relocs
;
5011 irelaend
= irela
+ input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5012 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5014 Elf_External_Rel
*erel
;
5016 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
5017 for (; irela
< irelaend
; irela
++, erel
++)
5019 Elf_Internal_Rel irel
;
5021 irel
.r_offset
= irela
->r_offset
;
5022 irel
.r_info
= irela
->r_info
;
5023 BFD_ASSERT (irela
->r_addend
== 0);
5024 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5029 Elf_External_Rela
*erela
;
5031 BFD_ASSERT (input_rel_hdr
->sh_entsize
5032 == sizeof (Elf_External_Rela
));
5033 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
5034 for (; irela
< irelaend
; irela
++, erela
++)
5035 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5038 /* Bump the counter, so that we know where to add the next set of
5040 *rel_countp
+= input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5043 /* Link an input file into the linker output file. This function
5044 handles all the sections and relocations of the input file at once.
5045 This is so that we only have to read the local symbols once, and
5046 don't have to keep them in memory. */
5049 elf_link_input_bfd (finfo
, input_bfd
)
5050 struct elf_final_link_info
*finfo
;
5053 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
5054 bfd
*, asection
*, bfd_byte
*,
5055 Elf_Internal_Rela
*,
5056 Elf_Internal_Sym
*, asection
**));
5058 Elf_Internal_Shdr
*symtab_hdr
;
5061 Elf_External_Sym
*external_syms
;
5062 Elf_External_Sym
*esym
;
5063 Elf_External_Sym
*esymend
;
5064 Elf_Internal_Sym
*isym
;
5066 asection
**ppsection
;
5068 struct elf_backend_data
*bed
;
5070 output_bfd
= finfo
->output_bfd
;
5071 bed
= get_elf_backend_data (output_bfd
);
5072 relocate_section
= bed
->elf_backend_relocate_section
;
5074 /* If this is a dynamic object, we don't want to do anything here:
5075 we don't want the local symbols, and we don't want the section
5077 if ((input_bfd
->flags
& DYNAMIC
) != 0)
5080 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5081 if (elf_bad_symtab (input_bfd
))
5083 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5088 locsymcount
= symtab_hdr
->sh_info
;
5089 extsymoff
= symtab_hdr
->sh_info
;
5092 /* Read the local symbols. */
5093 if (symtab_hdr
->contents
!= NULL
)
5094 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5095 else if (locsymcount
== 0)
5096 external_syms
= NULL
;
5099 external_syms
= finfo
->external_syms
;
5100 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5101 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
5102 locsymcount
, input_bfd
)
5103 != locsymcount
* sizeof (Elf_External_Sym
)))
5107 /* Swap in the local symbols and write out the ones which we know
5108 are going into the output file. */
5109 esym
= external_syms
;
5110 esymend
= esym
+ locsymcount
;
5111 isym
= finfo
->internal_syms
;
5112 pindex
= finfo
->indices
;
5113 ppsection
= finfo
->sections
;
5114 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
5118 Elf_Internal_Sym osym
;
5120 elf_swap_symbol_in (input_bfd
, esym
, isym
);
5123 if (elf_bad_symtab (input_bfd
))
5125 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
5132 if (isym
->st_shndx
== SHN_UNDEF
)
5133 isec
= bfd_und_section_ptr
;
5134 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
5135 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
5136 else if (isym
->st_shndx
== SHN_ABS
)
5137 isec
= bfd_abs_section_ptr
;
5138 else if (isym
->st_shndx
== SHN_COMMON
)
5139 isec
= bfd_com_section_ptr
;
5148 /* Don't output the first, undefined, symbol. */
5149 if (esym
== external_syms
)
5152 /* If we are stripping all symbols, we don't want to output this
5154 if (finfo
->info
->strip
== strip_all
)
5157 /* We never output section symbols. Instead, we use the section
5158 symbol of the corresponding section in the output file. */
5159 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5162 /* If we are discarding all local symbols, we don't want to
5163 output this one. If we are generating a relocateable output
5164 file, then some of the local symbols may be required by
5165 relocs; we output them below as we discover that they are
5167 if (finfo
->info
->discard
== discard_all
)
5170 /* If this symbol is defined in a section which we are
5171 discarding, we don't need to keep it, but note that
5172 linker_mark is only reliable for sections that have contents.
5173 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5174 as well as linker_mark. */
5175 if (isym
->st_shndx
> 0
5176 && isym
->st_shndx
< SHN_LORESERVE
5178 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
5179 || (! finfo
->info
->relocateable
5180 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
5183 /* Get the name of the symbol. */
5184 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
5189 /* See if we are discarding symbols with this name. */
5190 if ((finfo
->info
->strip
== strip_some
5191 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
5193 || (finfo
->info
->discard
== discard_l
5194 && bfd_is_local_label_name (input_bfd
, name
)))
5197 /* If we get here, we are going to output this symbol. */
5201 /* Adjust the section index for the output file. */
5202 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
5203 isec
->output_section
);
5204 if (osym
.st_shndx
== (unsigned short) -1)
5207 *pindex
= bfd_get_symcount (output_bfd
);
5209 /* ELF symbols in relocateable files are section relative, but
5210 in executable files they are virtual addresses. Note that
5211 this code assumes that all ELF sections have an associated
5212 BFD section with a reasonable value for output_offset; below
5213 we assume that they also have a reasonable value for
5214 output_section. Any special sections must be set up to meet
5215 these requirements. */
5216 osym
.st_value
+= isec
->output_offset
;
5217 if (! finfo
->info
->relocateable
)
5218 osym
.st_value
+= isec
->output_section
->vma
;
5220 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
5224 /* Relocate the contents of each section. */
5225 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
5229 if (! o
->linker_mark
)
5231 /* This section was omitted from the link. */
5235 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5236 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
5239 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
5241 /* Section was created by elf_link_create_dynamic_sections
5246 /* Get the contents of the section. They have been cached by a
5247 relaxation routine. Note that o is a section in an input
5248 file, so the contents field will not have been set by any of
5249 the routines which work on output files. */
5250 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
5251 contents
= elf_section_data (o
)->this_hdr
.contents
;
5254 contents
= finfo
->contents
;
5255 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
5256 (file_ptr
) 0, o
->_raw_size
))
5260 if ((o
->flags
& SEC_RELOC
) != 0)
5262 Elf_Internal_Rela
*internal_relocs
;
5264 /* Get the swapped relocs. */
5265 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5266 (input_bfd
, o
, finfo
->external_relocs
,
5267 finfo
->internal_relocs
, false));
5268 if (internal_relocs
== NULL
5269 && o
->reloc_count
> 0)
5272 /* Relocate the section by invoking a back end routine.
5274 The back end routine is responsible for adjusting the
5275 section contents as necessary, and (if using Rela relocs
5276 and generating a relocateable output file) adjusting the
5277 reloc addend as necessary.
5279 The back end routine does not have to worry about setting
5280 the reloc address or the reloc symbol index.
5282 The back end routine is given a pointer to the swapped in
5283 internal symbols, and can access the hash table entries
5284 for the external symbols via elf_sym_hashes (input_bfd).
5286 When generating relocateable output, the back end routine
5287 must handle STB_LOCAL/STT_SECTION symbols specially. The
5288 output symbol is going to be a section symbol
5289 corresponding to the output section, which will require
5290 the addend to be adjusted. */
5292 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
5293 input_bfd
, o
, contents
,
5295 finfo
->internal_syms
,
5299 if (finfo
->info
->relocateable
)
5301 Elf_Internal_Rela
*irela
;
5302 Elf_Internal_Rela
*irelaend
;
5303 struct elf_link_hash_entry
**rel_hash
;
5304 Elf_Internal_Shdr
*input_rel_hdr
;
5306 /* Adjust the reloc addresses and symbol indices. */
5308 irela
= internal_relocs
;
5310 irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5311 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
5312 + elf_section_data (o
->output_section
)->rel_count
5313 + elf_section_data (o
->output_section
)->rel_count2
);
5314 for (; irela
< irelaend
; irela
++, rel_hash
++)
5316 unsigned long r_symndx
;
5317 Elf_Internal_Sym
*isym
;
5320 irela
->r_offset
+= o
->output_offset
;
5322 r_symndx
= ELF_R_SYM (irela
->r_info
);
5327 if (r_symndx
>= locsymcount
5328 || (elf_bad_symtab (input_bfd
)
5329 && finfo
->sections
[r_symndx
] == NULL
))
5331 struct elf_link_hash_entry
*rh
;
5334 /* This is a reloc against a global symbol. We
5335 have not yet output all the local symbols, so
5336 we do not know the symbol index of any global
5337 symbol. We set the rel_hash entry for this
5338 reloc to point to the global hash table entry
5339 for this symbol. The symbol index is then
5340 set at the end of elf_bfd_final_link. */
5341 indx
= r_symndx
- extsymoff
;
5342 rh
= elf_sym_hashes (input_bfd
)[indx
];
5343 while (rh
->root
.type
== bfd_link_hash_indirect
5344 || rh
->root
.type
== bfd_link_hash_warning
)
5345 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5347 /* Setting the index to -2 tells
5348 elf_link_output_extsym that this symbol is
5350 BFD_ASSERT (rh
->indx
< 0);
5358 /* This is a reloc against a local symbol. */
5361 isym
= finfo
->internal_syms
+ r_symndx
;
5362 sec
= finfo
->sections
[r_symndx
];
5363 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5365 /* I suppose the backend ought to fill in the
5366 section of any STT_SECTION symbol against a
5367 processor specific section. If we have
5368 discarded a section, the output_section will
5369 be the absolute section. */
5371 && (bfd_is_abs_section (sec
)
5372 || (sec
->output_section
!= NULL
5373 && bfd_is_abs_section (sec
->output_section
))))
5375 else if (sec
== NULL
|| sec
->owner
== NULL
)
5377 bfd_set_error (bfd_error_bad_value
);
5382 r_symndx
= sec
->output_section
->target_index
;
5383 BFD_ASSERT (r_symndx
!= 0);
5388 if (finfo
->indices
[r_symndx
] == -1)
5394 if (finfo
->info
->strip
== strip_all
)
5396 /* You can't do ld -r -s. */
5397 bfd_set_error (bfd_error_invalid_operation
);
5401 /* This symbol was skipped earlier, but
5402 since it is needed by a reloc, we
5403 must output it now. */
5404 link
= symtab_hdr
->sh_link
;
5405 name
= bfd_elf_string_from_elf_section (input_bfd
,
5411 osec
= sec
->output_section
;
5413 _bfd_elf_section_from_bfd_section (output_bfd
,
5415 if (isym
->st_shndx
== (unsigned short) -1)
5418 isym
->st_value
+= sec
->output_offset
;
5419 if (! finfo
->info
->relocateable
)
5420 isym
->st_value
+= osec
->vma
;
5422 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5424 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5428 r_symndx
= finfo
->indices
[r_symndx
];
5431 irela
->r_info
= ELF_R_INFO (r_symndx
,
5432 ELF_R_TYPE (irela
->r_info
));
5435 /* Swap out the relocs. */
5436 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5437 elf_link_output_relocs (output_bfd
, o
,
5441 += input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5442 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
5444 elf_link_output_relocs (output_bfd
, o
,
5450 /* Write out the modified section contents. */
5451 if (elf_section_data (o
)->stab_info
== NULL
)
5453 if (! (o
->flags
& SEC_EXCLUDE
) &&
5454 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5455 contents
, o
->output_offset
,
5456 (o
->_cooked_size
!= 0
5463 if (! (_bfd_write_section_stabs
5464 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5465 o
, &elf_section_data (o
)->stab_info
, contents
)))
5473 /* Generate a reloc when linking an ELF file. This is a reloc
5474 requested by the linker, and does come from any input file. This
5475 is used to build constructor and destructor tables when linking
5479 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5481 struct bfd_link_info
*info
;
5482 asection
*output_section
;
5483 struct bfd_link_order
*link_order
;
5485 reloc_howto_type
*howto
;
5489 struct elf_link_hash_entry
**rel_hash_ptr
;
5490 Elf_Internal_Shdr
*rel_hdr
;
5492 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5495 bfd_set_error (bfd_error_bad_value
);
5499 addend
= link_order
->u
.reloc
.p
->addend
;
5501 /* Figure out the symbol index. */
5502 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5503 + elf_section_data (output_section
)->rel_count
5504 + elf_section_data (output_section
)->rel_count2
);
5505 if (link_order
->type
== bfd_section_reloc_link_order
)
5507 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5508 BFD_ASSERT (indx
!= 0);
5509 *rel_hash_ptr
= NULL
;
5513 struct elf_link_hash_entry
*h
;
5515 /* Treat a reloc against a defined symbol as though it were
5516 actually against the section. */
5517 h
= ((struct elf_link_hash_entry
*)
5518 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5519 link_order
->u
.reloc
.p
->u
.name
,
5520 false, false, true));
5522 && (h
->root
.type
== bfd_link_hash_defined
5523 || h
->root
.type
== bfd_link_hash_defweak
))
5527 section
= h
->root
.u
.def
.section
;
5528 indx
= section
->output_section
->target_index
;
5529 *rel_hash_ptr
= NULL
;
5530 /* It seems that we ought to add the symbol value to the
5531 addend here, but in practice it has already been added
5532 because it was passed to constructor_callback. */
5533 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5537 /* Setting the index to -2 tells elf_link_output_extsym that
5538 this symbol is used by a reloc. */
5545 if (! ((*info
->callbacks
->unattached_reloc
)
5546 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5547 (asection
*) NULL
, (bfd_vma
) 0)))
5553 /* If this is an inplace reloc, we must write the addend into the
5555 if (howto
->partial_inplace
&& addend
!= 0)
5558 bfd_reloc_status_type rstat
;
5562 size
= bfd_get_reloc_size (howto
);
5563 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5564 if (buf
== (bfd_byte
*) NULL
)
5566 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5572 case bfd_reloc_outofrange
:
5574 case bfd_reloc_overflow
:
5575 if (! ((*info
->callbacks
->reloc_overflow
)
5577 (link_order
->type
== bfd_section_reloc_link_order
5578 ? bfd_section_name (output_bfd
,
5579 link_order
->u
.reloc
.p
->u
.section
)
5580 : link_order
->u
.reloc
.p
->u
.name
),
5581 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5589 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5590 (file_ptr
) link_order
->offset
, size
);
5596 /* The address of a reloc is relative to the section in a
5597 relocateable file, and is a virtual address in an executable
5599 offset
= link_order
->offset
;
5600 if (! info
->relocateable
)
5601 offset
+= output_section
->vma
;
5603 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5605 if (rel_hdr
->sh_type
== SHT_REL
)
5607 Elf_Internal_Rel irel
;
5608 Elf_External_Rel
*erel
;
5610 irel
.r_offset
= offset
;
5611 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5612 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5613 + elf_section_data (output_section
)->rel_count
);
5614 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5618 Elf_Internal_Rela irela
;
5619 Elf_External_Rela
*erela
;
5621 irela
.r_offset
= offset
;
5622 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5623 irela
.r_addend
= addend
;
5624 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5625 + elf_section_data (output_section
)->rel_count
);
5626 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5629 ++elf_section_data (output_section
)->rel_count
;
5635 /* Allocate a pointer to live in a linker created section. */
5638 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5640 struct bfd_link_info
*info
;
5641 elf_linker_section_t
*lsect
;
5642 struct elf_link_hash_entry
*h
;
5643 const Elf_Internal_Rela
*rel
;
5645 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5646 elf_linker_section_pointers_t
*linker_section_ptr
;
5647 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5649 BFD_ASSERT (lsect
!= NULL
);
5651 /* Is this a global symbol? */
5654 /* Has this symbol already been allocated, if so, our work is done */
5655 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5660 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5661 /* Make sure this symbol is output as a dynamic symbol. */
5662 if (h
->dynindx
== -1)
5664 if (! elf_link_record_dynamic_symbol (info
, h
))
5668 if (lsect
->rel_section
)
5669 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5672 else /* Allocation of a pointer to a local symbol */
5674 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5676 /* Allocate a table to hold the local symbols if first time */
5679 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5680 register unsigned int i
;
5682 ptr
= (elf_linker_section_pointers_t
**)
5683 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5688 elf_local_ptr_offsets (abfd
) = ptr
;
5689 for (i
= 0; i
< num_symbols
; i
++)
5690 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5693 /* Has this symbol already been allocated, if so, our work is done */
5694 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5699 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5703 /* If we are generating a shared object, we need to
5704 output a R_<xxx>_RELATIVE reloc so that the
5705 dynamic linker can adjust this GOT entry. */
5706 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5707 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5711 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5712 from internal memory. */
5713 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5714 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5715 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5717 if (!linker_section_ptr
)
5720 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5721 linker_section_ptr
->addend
= rel
->r_addend
;
5722 linker_section_ptr
->which
= lsect
->which
;
5723 linker_section_ptr
->written_address_p
= false;
5724 *ptr_linker_section_ptr
= linker_section_ptr
;
5727 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5729 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5730 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5731 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5732 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5734 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5736 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5737 lsect
->sym_hash
->root
.root
.string
,
5738 (long)ARCH_SIZE
/ 8,
5739 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5745 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5747 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5750 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5751 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5759 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5762 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5765 /* Fill in the address for a pointer generated in alinker section. */
5768 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5771 struct bfd_link_info
*info
;
5772 elf_linker_section_t
*lsect
;
5773 struct elf_link_hash_entry
*h
;
5775 const Elf_Internal_Rela
*rel
;
5778 elf_linker_section_pointers_t
*linker_section_ptr
;
5780 BFD_ASSERT (lsect
!= NULL
);
5782 if (h
!= NULL
) /* global symbol */
5784 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5788 BFD_ASSERT (linker_section_ptr
!= NULL
);
5790 if (! elf_hash_table (info
)->dynamic_sections_created
5793 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5795 /* This is actually a static link, or it is a
5796 -Bsymbolic link and the symbol is defined
5797 locally. We must initialize this entry in the
5800 When doing a dynamic link, we create a .rela.<xxx>
5801 relocation entry to initialize the value. This
5802 is done in the finish_dynamic_symbol routine. */
5803 if (!linker_section_ptr
->written_address_p
)
5805 linker_section_ptr
->written_address_p
= true;
5806 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5807 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5811 else /* local symbol */
5813 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5814 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5815 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5816 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5820 BFD_ASSERT (linker_section_ptr
!= NULL
);
5822 /* Write out pointer if it hasn't been rewritten out before */
5823 if (!linker_section_ptr
->written_address_p
)
5825 linker_section_ptr
->written_address_p
= true;
5826 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5827 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5831 asection
*srel
= lsect
->rel_section
;
5832 Elf_Internal_Rela outrel
;
5834 /* We need to generate a relative reloc for the dynamic linker. */
5836 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5839 BFD_ASSERT (srel
!= NULL
);
5841 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5842 + lsect
->section
->output_offset
5843 + linker_section_ptr
->offset
);
5844 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5845 outrel
.r_addend
= 0;
5846 elf_swap_reloca_out (output_bfd
, &outrel
,
5847 (((Elf_External_Rela
*)
5848 lsect
->section
->contents
)
5849 + elf_section_data (lsect
->section
)->rel_count
));
5850 ++elf_section_data (lsect
->section
)->rel_count
;
5855 relocation
= (lsect
->section
->output_offset
5856 + linker_section_ptr
->offset
5857 - lsect
->hole_offset
5858 - lsect
->sym_offset
);
5861 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5862 lsect
->name
, (long)relocation
, (long)relocation
);
5865 /* Subtract out the addend, because it will get added back in by the normal
5867 return relocation
- linker_section_ptr
->addend
;
5870 /* Garbage collect unused sections. */
5872 static boolean elf_gc_mark
5873 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5874 asection
* (*gc_mark_hook
)
5875 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5876 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5878 static boolean elf_gc_sweep
5879 PARAMS ((struct bfd_link_info
*info
,
5880 boolean (*gc_sweep_hook
)
5881 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5882 const Elf_Internal_Rela
*relocs
))));
5884 static boolean elf_gc_sweep_symbol
5885 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5887 static boolean elf_gc_allocate_got_offsets
5888 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5890 static boolean elf_gc_propagate_vtable_entries_used
5891 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5893 static boolean elf_gc_smash_unused_vtentry_relocs
5894 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5896 /* The mark phase of garbage collection. For a given section, mark
5897 it, and all the sections which define symbols to which it refers. */
5900 elf_gc_mark (info
, sec
, gc_mark_hook
)
5901 struct bfd_link_info
*info
;
5903 asection
* (*gc_mark_hook
)
5904 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5905 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
5911 /* Look through the section relocs. */
5913 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
5915 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
5916 Elf_Internal_Shdr
*symtab_hdr
;
5917 struct elf_link_hash_entry
**sym_hashes
;
5920 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
5921 bfd
*input_bfd
= sec
->owner
;
5922 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
5924 /* GCFIXME: how to arrange so that relocs and symbols are not
5925 reread continually? */
5927 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5928 sym_hashes
= elf_sym_hashes (input_bfd
);
5930 /* Read the local symbols. */
5931 if (elf_bad_symtab (input_bfd
))
5933 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5937 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
5938 if (symtab_hdr
->contents
)
5939 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5940 else if (nlocsyms
== 0)
5944 locsyms
= freesyms
=
5945 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
5946 if (freesyms
== NULL
5947 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5948 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
5949 nlocsyms
, input_bfd
)
5950 != nlocsyms
* sizeof (Elf_External_Sym
)))
5957 /* Read the relocations. */
5958 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
5959 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
5960 info
->keep_memory
));
5961 if (relstart
== NULL
)
5966 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5968 for (rel
= relstart
; rel
< relend
; rel
++)
5970 unsigned long r_symndx
;
5972 struct elf_link_hash_entry
*h
;
5975 r_symndx
= ELF_R_SYM (rel
->r_info
);
5979 if (elf_bad_symtab (sec
->owner
))
5981 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5982 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
5983 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
5986 h
= sym_hashes
[r_symndx
- extsymoff
];
5987 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5990 else if (r_symndx
>= nlocsyms
)
5992 h
= sym_hashes
[r_symndx
- extsymoff
];
5993 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
5997 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
5998 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6001 if (rsec
&& !rsec
->gc_mark
)
6002 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
6010 if (!info
->keep_memory
)
6020 /* The sweep phase of garbage collection. Remove all garbage sections. */
6023 elf_gc_sweep (info
, gc_sweep_hook
)
6024 struct bfd_link_info
*info
;
6025 boolean (*gc_sweep_hook
)
6026 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6027 const Elf_Internal_Rela
*relocs
));
6031 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6035 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6037 /* Keep special sections. Keep .debug sections. */
6038 if ((o
->flags
& SEC_LINKER_CREATED
)
6039 || (o
->flags
& SEC_DEBUGGING
))
6045 /* Skip sweeping sections already excluded. */
6046 if (o
->flags
& SEC_EXCLUDE
)
6049 /* Since this is early in the link process, it is simple
6050 to remove a section from the output. */
6051 o
->flags
|= SEC_EXCLUDE
;
6053 /* But we also have to update some of the relocation
6054 info we collected before. */
6056 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
6058 Elf_Internal_Rela
*internal_relocs
;
6061 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6062 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
6063 if (internal_relocs
== NULL
)
6066 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
6068 if (!info
->keep_memory
)
6069 free (internal_relocs
);
6077 /* Remove the symbols that were in the swept sections from the dynamic
6078 symbol table. GCFIXME: Anyone know how to get them out of the
6079 static symbol table as well? */
6083 elf_link_hash_traverse (elf_hash_table (info
),
6084 elf_gc_sweep_symbol
,
6087 elf_hash_table (info
)->dynsymcount
= i
;
6093 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6096 elf_gc_sweep_symbol (h
, idxptr
)
6097 struct elf_link_hash_entry
*h
;
6100 int *idx
= (int *) idxptr
;
6102 if (h
->dynindx
!= -1
6103 && ((h
->root
.type
!= bfd_link_hash_defined
6104 && h
->root
.type
!= bfd_link_hash_defweak
)
6105 || h
->root
.u
.def
.section
->gc_mark
))
6106 h
->dynindx
= (*idx
)++;
6111 /* Propogate collected vtable information. This is called through
6112 elf_link_hash_traverse. */
6115 elf_gc_propagate_vtable_entries_used (h
, okp
)
6116 struct elf_link_hash_entry
*h
;
6119 /* Those that are not vtables. */
6120 if (h
->vtable_parent
== NULL
)
6123 /* Those vtables that do not have parents, we cannot merge. */
6124 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
6127 /* If we've already been done, exit. */
6128 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
6131 /* Make sure the parent's table is up to date. */
6132 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
6134 if (h
->vtable_entries_used
== NULL
)
6136 /* None of this table's entries were referenced. Re-use the
6138 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
6139 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
6146 /* Or the parent's entries into ours. */
6147 cu
= h
->vtable_entries_used
;
6149 pu
= h
->vtable_parent
->vtable_entries_used
;
6152 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
6155 if (*pu
) *cu
= true;
6165 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
6166 struct elf_link_hash_entry
*h
;
6170 bfd_vma hstart
, hend
;
6171 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
6172 struct elf_backend_data
*bed
;
6174 /* Take care of both those symbols that do not describe vtables as
6175 well as those that are not loaded. */
6176 if (h
->vtable_parent
== NULL
)
6179 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
6180 || h
->root
.type
== bfd_link_hash_defweak
);
6182 sec
= h
->root
.u
.def
.section
;
6183 hstart
= h
->root
.u
.def
.value
;
6184 hend
= hstart
+ h
->size
;
6186 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6187 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
6189 return *(boolean
*)okp
= false;
6190 bed
= get_elf_backend_data (sec
->owner
);
6191 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6193 for (rel
= relstart
; rel
< relend
; ++rel
)
6194 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
6196 /* If the entry is in use, do nothing. */
6197 if (h
->vtable_entries_used
6198 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
6200 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
6201 if (h
->vtable_entries_used
[entry
])
6204 /* Otherwise, kill it. */
6205 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
6211 /* Do mark and sweep of unused sections. */
6214 elf_gc_sections (abfd
, info
)
6216 struct bfd_link_info
*info
;
6220 asection
* (*gc_mark_hook
)
6221 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
6222 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
6224 if (!get_elf_backend_data (abfd
)->can_gc_sections
6225 || info
->relocateable
6226 || elf_hash_table (info
)->dynamic_sections_created
)
6229 /* Apply transitive closure to the vtable entry usage info. */
6230 elf_link_hash_traverse (elf_hash_table (info
),
6231 elf_gc_propagate_vtable_entries_used
,
6236 /* Kill the vtable relocations that were not used. */
6237 elf_link_hash_traverse (elf_hash_table (info
),
6238 elf_gc_smash_unused_vtentry_relocs
,
6243 /* Grovel through relocs to find out who stays ... */
6245 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
6246 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6249 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6251 if (o
->flags
& SEC_KEEP
)
6252 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
6257 /* ... and mark SEC_EXCLUDE for those that go. */
6258 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
6264 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6267 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
6270 struct elf_link_hash_entry
*h
;
6273 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
6274 struct elf_link_hash_entry
**search
, *child
;
6275 bfd_size_type extsymcount
;
6277 /* The sh_info field of the symtab header tells us where the
6278 external symbols start. We don't care about the local symbols at
6280 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
6281 if (!elf_bad_symtab (abfd
))
6282 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6284 sym_hashes
= elf_sym_hashes (abfd
);
6285 sym_hashes_end
= sym_hashes
+ extsymcount
;
6287 /* Hunt down the child symbol, which is in this section at the same
6288 offset as the relocation. */
6289 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
6291 if ((child
= *search
) != NULL
6292 && (child
->root
.type
== bfd_link_hash_defined
6293 || child
->root
.type
== bfd_link_hash_defweak
)
6294 && child
->root
.u
.def
.section
== sec
6295 && child
->root
.u
.def
.value
== offset
)
6299 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
6300 bfd_get_filename (abfd
), sec
->name
,
6301 (unsigned long)offset
);
6302 bfd_set_error (bfd_error_invalid_operation
);
6308 /* This *should* only be the absolute section. It could potentially
6309 be that someone has defined a non-global vtable though, which
6310 would be bad. It isn't worth paging in the local symbols to be
6311 sure though; that case should simply be handled by the assembler. */
6313 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6316 child
->vtable_parent
= h
;
6321 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6324 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6325 bfd
*abfd ATTRIBUTE_UNUSED
;
6326 asection
*sec ATTRIBUTE_UNUSED
;
6327 struct elf_link_hash_entry
*h
;
6330 if (addend
>= h
->vtable_entries_size
)
6333 boolean
*ptr
= h
->vtable_entries_used
;
6335 /* While the symbol is undefined, we have to be prepared to handle
6337 if (h
->root
.type
== bfd_link_hash_undefined
)
6344 /* Oops! We've got a reference past the defined end of
6345 the table. This is probably a bug -- shall we warn? */
6350 /* Allocate one extra entry for use as a "done" flag for the
6351 consolidation pass. */
6352 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof(boolean
);
6358 ptr
= realloc (ptr
-1, bytes
);
6362 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof(boolean
);
6363 memset (ptr
+ oldbytes
, 0, bytes
- oldbytes
);
6367 ptr
= calloc (1, bytes
);
6372 /* And arrange for that done flag to be at index -1. */
6373 h
->vtable_entries_used
= ptr
+1;
6374 h
->vtable_entries_size
= size
;
6376 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6381 /* And an accompanying bit to work out final got entry offsets once
6382 we're done. Should be called from final_link. */
6385 elf_gc_common_finalize_got_offsets (abfd
, info
)
6387 struct bfd_link_info
*info
;
6390 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6393 /* The GOT offset is relative to the .got section, but the GOT header is
6394 put into the .got.plt section, if the backend uses it. */
6395 if (bed
->want_got_plt
)
6398 gotoff
= bed
->got_header_size
;
6400 /* Do the local .got entries first. */
6401 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6403 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
6404 bfd_size_type j
, locsymcount
;
6405 Elf_Internal_Shdr
*symtab_hdr
;
6410 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6411 if (elf_bad_symtab (i
))
6412 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6414 locsymcount
= symtab_hdr
->sh_info
;
6416 for (j
= 0; j
< locsymcount
; ++j
)
6418 if (local_got
[j
] > 0)
6420 local_got
[j
] = gotoff
;
6421 gotoff
+= ARCH_SIZE
/ 8;
6424 local_got
[j
] = (bfd_vma
) -1;
6428 /* Then the global .got and .plt entries. */
6429 elf_link_hash_traverse (elf_hash_table (info
),
6430 elf_gc_allocate_got_offsets
,
6435 /* We need a special top-level link routine to convert got reference counts
6436 to real got offsets. */
6439 elf_gc_allocate_got_offsets (h
, offarg
)
6440 struct elf_link_hash_entry
*h
;
6443 bfd_vma
*off
= (bfd_vma
*) offarg
;
6445 if (h
->got
.refcount
> 0)
6447 h
->got
.offset
= off
[0];
6448 off
[0] += ARCH_SIZE
/ 8;
6451 h
->got
.offset
= (bfd_vma
) -1;
6456 /* Many folk need no more in the way of final link than this, once
6457 got entry reference counting is enabled. */
6460 elf_gc_common_final_link (abfd
, info
)
6462 struct bfd_link_info
*info
;
6464 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6467 /* Invoke the regular ELF backend linker to do all the work. */
6468 return elf_bfd_final_link (abfd
, info
);
6471 /* This function will be called though elf_link_hash_traverse to store
6472 all hash value of the exported symbols in an array. */
6475 elf_collect_hash_codes (h
, data
)
6476 struct elf_link_hash_entry
*h
;
6479 unsigned long **valuep
= (unsigned long **) data
;
6485 /* Ignore indirect symbols. These are added by the versioning code. */
6486 if (h
->dynindx
== -1)
6489 name
= h
->root
.root
.string
;
6490 p
= strchr (name
, ELF_VER_CHR
);
6493 alc
= bfd_malloc (p
- name
+ 1);
6494 memcpy (alc
, name
, p
- name
);
6495 alc
[p
- name
] = '\0';
6499 /* Compute the hash value. */
6500 ha
= bfd_elf_hash (name
);
6502 /* Store the found hash value in the array given as the argument. */
6505 /* And store it in the struct so that we can put it in the hash table
6507 h
->elf_hash_value
= ha
;