2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* ELF linker code. */
23 /* This struct is used to pass information to routines called via
24 elf_link_hash_traverse which must return failure. */
26 struct elf_info_failed
29 struct bfd_link_info
*info
;
32 static boolean elf_link_add_object_symbols
33 PARAMS ((bfd
*, struct bfd_link_info
*));
34 static boolean elf_link_add_archive_symbols
35 PARAMS ((bfd
*, struct bfd_link_info
*));
36 static boolean elf_merge_symbol
37 PARAMS ((bfd
*, struct bfd_link_info
*, const char *, Elf_Internal_Sym
*,
38 asection
**, bfd_vma
*, struct elf_link_hash_entry
**,
39 boolean
*, boolean
*, boolean
*, boolean
));
40 static boolean elf_export_symbol
41 PARAMS ((struct elf_link_hash_entry
*, PTR
));
42 static boolean elf_fix_symbol_flags
43 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
44 static boolean elf_adjust_dynamic_symbol
45 PARAMS ((struct elf_link_hash_entry
*, PTR
));
46 static boolean elf_link_find_version_dependencies
47 PARAMS ((struct elf_link_hash_entry
*, PTR
));
48 static boolean elf_link_find_version_dependencies
49 PARAMS ((struct elf_link_hash_entry
*, PTR
));
50 static boolean elf_link_assign_sym_version
51 PARAMS ((struct elf_link_hash_entry
*, PTR
));
52 static boolean elf_collect_hash_codes
53 PARAMS ((struct elf_link_hash_entry
*, PTR
));
54 static boolean elf_link_read_relocs_from_section
55 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
56 static void elf_link_output_relocs
57 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
58 static boolean elf_link_size_reloc_section
59 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
60 static void elf_link_adjust_relocs
61 PARAMS ((bfd
*, Elf_Internal_Shdr
*, unsigned int,
62 struct elf_link_hash_entry
**));
64 /* Given an ELF BFD, add symbols to the global hash table as
68 elf_bfd_link_add_symbols (abfd
, info
)
70 struct bfd_link_info
*info
;
72 switch (bfd_get_format (abfd
))
75 return elf_link_add_object_symbols (abfd
, info
);
77 return elf_link_add_archive_symbols (abfd
, info
);
79 bfd_set_error (bfd_error_wrong_format
);
84 /* Return true iff this is a non-common, definition of a non-function symbol. */
86 is_global_data_symbol_definition (abfd
, sym
)
87 bfd
* abfd ATTRIBUTE_UNUSED
;
88 Elf_Internal_Sym
* sym
;
90 /* Local symbols do not count, but target specific ones might. */
91 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
92 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
95 /* Function symbols do not count. */
96 if (ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)
99 /* If the section is undefined, then so is the symbol. */
100 if (sym
->st_shndx
== SHN_UNDEF
)
103 /* If the symbol is defined in the common section, then
104 it is a common definition and so does not count. */
105 if (sym
->st_shndx
== SHN_COMMON
)
108 /* If the symbol is in a target specific section then we
109 must rely upon the backend to tell us what it is. */
110 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
111 /* FIXME - this function is not coded yet:
113 return _bfd_is_global_symbol_definition (abfd, sym);
115 Instead for now assume that the definition is not global,
116 Even if this is wrong, at least the linker will behave
117 in the same way that it used to do. */
123 /* Search the symbol table of the archive element of the archive ABFD
124 whoes archive map contains a mention of SYMDEF, and determine if
125 the symbol is defined in this element. */
127 elf_link_is_defined_archive_symbol (abfd
, symdef
)
131 Elf_Internal_Shdr
* hdr
;
132 Elf_External_Sym
* esym
;
133 Elf_External_Sym
* esymend
;
134 Elf_External_Sym
* buf
= NULL
;
138 boolean result
= false;
140 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
141 if (abfd
== (bfd
*) NULL
)
144 if (! bfd_check_format (abfd
, bfd_object
))
147 /* If we have already included the element containing this symbol in the
148 link then we do not need to include it again. Just claim that any symbol
149 it contains is not a definition, so that our caller will not decide to
150 (re)include this element. */
151 if (abfd
->archive_pass
)
154 /* Select the appropriate symbol table. */
155 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
156 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
158 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
160 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
162 /* The sh_info field of the symtab header tells us where the
163 external symbols start. We don't care about the local symbols. */
164 if (elf_bad_symtab (abfd
))
166 extsymcount
= symcount
;
171 extsymcount
= symcount
- hdr
->sh_info
;
172 extsymoff
= hdr
->sh_info
;
175 buf
= ((Elf_External_Sym
*)
176 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
177 if (buf
== NULL
&& extsymcount
!= 0)
180 /* Read in the symbol table.
181 FIXME: This ought to be cached somewhere. */
183 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
185 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
186 != extsymcount
* sizeof (Elf_External_Sym
)))
192 /* Scan the symbol table looking for SYMDEF. */
193 esymend
= buf
+ extsymcount
;
198 Elf_Internal_Sym sym
;
201 elf_swap_symbol_in (abfd
, esym
, & sym
);
203 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
204 if (name
== (const char *) NULL
)
207 if (strcmp (name
, symdef
->name
) == 0)
209 result
= is_global_data_symbol_definition (abfd
, & sym
);
219 /* Add symbols from an ELF archive file to the linker hash table. We
220 don't use _bfd_generic_link_add_archive_symbols because of a
221 problem which arises on UnixWare. The UnixWare libc.so is an
222 archive which includes an entry libc.so.1 which defines a bunch of
223 symbols. The libc.so archive also includes a number of other
224 object files, which also define symbols, some of which are the same
225 as those defined in libc.so.1. Correct linking requires that we
226 consider each object file in turn, and include it if it defines any
227 symbols we need. _bfd_generic_link_add_archive_symbols does not do
228 this; it looks through the list of undefined symbols, and includes
229 any object file which defines them. When this algorithm is used on
230 UnixWare, it winds up pulling in libc.so.1 early and defining a
231 bunch of symbols. This means that some of the other objects in the
232 archive are not included in the link, which is incorrect since they
233 precede libc.so.1 in the archive.
235 Fortunately, ELF archive handling is simpler than that done by
236 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
237 oddities. In ELF, if we find a symbol in the archive map, and the
238 symbol is currently undefined, we know that we must pull in that
241 Unfortunately, we do have to make multiple passes over the symbol
242 table until nothing further is resolved. */
245 elf_link_add_archive_symbols (abfd
, info
)
247 struct bfd_link_info
*info
;
250 boolean
*defined
= NULL
;
251 boolean
*included
= NULL
;
255 if (! bfd_has_map (abfd
))
257 /* An empty archive is a special case. */
258 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
260 bfd_set_error (bfd_error_no_armap
);
264 /* Keep track of all symbols we know to be already defined, and all
265 files we know to be already included. This is to speed up the
266 second and subsequent passes. */
267 c
= bfd_ardata (abfd
)->symdef_count
;
270 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
271 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
272 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
274 memset (defined
, 0, c
* sizeof (boolean
));
275 memset (included
, 0, c
* sizeof (boolean
));
277 symdefs
= bfd_ardata (abfd
)->symdefs
;
290 symdefend
= symdef
+ c
;
291 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
293 struct elf_link_hash_entry
*h
;
295 struct bfd_link_hash_entry
*undefs_tail
;
298 if (defined
[i
] || included
[i
])
300 if (symdef
->file_offset
== last
)
306 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
307 false, false, false);
313 /* If this is a default version (the name contains @@),
314 look up the symbol again without the version. The
315 effect is that references to the symbol without the
316 version will be matched by the default symbol in the
319 p
= strchr (symdef
->name
, ELF_VER_CHR
);
320 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
323 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
326 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
327 copy
[p
- symdef
->name
] = '\0';
329 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
330 false, false, false);
332 bfd_release (abfd
, copy
);
338 if (h
->root
.type
== bfd_link_hash_common
)
340 /* We currently have a common symbol. The archive map contains
341 a reference to this symbol, so we may want to include it. We
342 only want to include it however, if this archive element
343 contains a definition of the symbol, not just another common
346 Unfortunately some archivers (including GNU ar) will put
347 declarations of common symbols into their archive maps, as
348 well as real definitions, so we cannot just go by the archive
349 map alone. Instead we must read in the element's symbol
350 table and check that to see what kind of symbol definition
352 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
355 else if (h
->root
.type
!= bfd_link_hash_undefined
)
357 if (h
->root
.type
!= bfd_link_hash_undefweak
)
362 /* We need to include this archive member. */
363 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
364 if (element
== (bfd
*) NULL
)
367 if (! bfd_check_format (element
, bfd_object
))
370 /* Doublecheck that we have not included this object
371 already--it should be impossible, but there may be
372 something wrong with the archive. */
373 if (element
->archive_pass
!= 0)
375 bfd_set_error (bfd_error_bad_value
);
378 element
->archive_pass
= 1;
380 undefs_tail
= info
->hash
->undefs_tail
;
382 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
385 if (! elf_link_add_object_symbols (element
, info
))
388 /* If there are any new undefined symbols, we need to make
389 another pass through the archive in order to see whether
390 they can be defined. FIXME: This isn't perfect, because
391 common symbols wind up on undefs_tail and because an
392 undefined symbol which is defined later on in this pass
393 does not require another pass. This isn't a bug, but it
394 does make the code less efficient than it could be. */
395 if (undefs_tail
!= info
->hash
->undefs_tail
)
398 /* Look backward to mark all symbols from this object file
399 which we have already seen in this pass. */
403 included
[mark
] = true;
408 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
410 /* We mark subsequent symbols from this object file as we go
411 on through the loop. */
412 last
= symdef
->file_offset
;
423 if (defined
!= (boolean
*) NULL
)
425 if (included
!= (boolean
*) NULL
)
430 /* This function is called when we want to define a new symbol. It
431 handles the various cases which arise when we find a definition in
432 a dynamic object, or when there is already a definition in a
433 dynamic object. The new symbol is described by NAME, SYM, PSEC,
434 and PVALUE. We set SYM_HASH to the hash table entry. We set
435 OVERRIDE if the old symbol is overriding a new definition. We set
436 TYPE_CHANGE_OK if it is OK for the type to change. We set
437 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
438 change, we mean that we shouldn't warn if the type or size does
439 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
443 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
444 override
, type_change_ok
, size_change_ok
, dt_needed
)
446 struct bfd_link_info
*info
;
448 Elf_Internal_Sym
*sym
;
451 struct elf_link_hash_entry
**sym_hash
;
453 boolean
*type_change_ok
;
454 boolean
*size_change_ok
;
458 struct elf_link_hash_entry
*h
;
461 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
466 bind
= ELF_ST_BIND (sym
->st_info
);
468 if (! bfd_is_und_section (sec
))
469 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
471 h
= ((struct elf_link_hash_entry
*)
472 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
477 /* This code is for coping with dynamic objects, and is only useful
478 if we are doing an ELF link. */
479 if (info
->hash
->creator
!= abfd
->xvec
)
482 /* For merging, we only care about real symbols. */
484 while (h
->root
.type
== bfd_link_hash_indirect
485 || h
->root
.type
== bfd_link_hash_warning
)
486 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
488 /* If we just created the symbol, mark it as being an ELF symbol.
489 Other than that, there is nothing to do--there is no merge issue
490 with a newly defined symbol--so we just return. */
492 if (h
->root
.type
== bfd_link_hash_new
)
494 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
498 /* OLDBFD is a BFD associated with the existing symbol. */
500 switch (h
->root
.type
)
506 case bfd_link_hash_undefined
:
507 case bfd_link_hash_undefweak
:
508 oldbfd
= h
->root
.u
.undef
.abfd
;
511 case bfd_link_hash_defined
:
512 case bfd_link_hash_defweak
:
513 oldbfd
= h
->root
.u
.def
.section
->owner
;
516 case bfd_link_hash_common
:
517 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
521 /* In cases involving weak versioned symbols, we may wind up trying
522 to merge a symbol with itself. Catch that here, to avoid the
523 confusion that results if we try to override a symbol with
524 itself. The additional tests catch cases like
525 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
526 dynamic object, which we do want to handle here. */
528 && ((abfd
->flags
& DYNAMIC
) == 0
529 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
532 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
533 respectively, is from a dynamic object. */
535 if ((abfd
->flags
& DYNAMIC
) != 0)
541 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
546 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
547 indices used by MIPS ELF. */
548 switch (h
->root
.type
)
554 case bfd_link_hash_defined
:
555 case bfd_link_hash_defweak
:
556 hsec
= h
->root
.u
.def
.section
;
559 case bfd_link_hash_common
:
560 hsec
= h
->root
.u
.c
.p
->section
;
567 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
570 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
571 respectively, appear to be a definition rather than reference. */
573 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
578 if (h
->root
.type
== bfd_link_hash_undefined
579 || h
->root
.type
== bfd_link_hash_undefweak
580 || h
->root
.type
== bfd_link_hash_common
)
585 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
586 symbol, respectively, appears to be a common symbol in a dynamic
587 object. If a symbol appears in an uninitialized section, and is
588 not weak, and is not a function, then it may be a common symbol
589 which was resolved when the dynamic object was created. We want
590 to treat such symbols specially, because they raise special
591 considerations when setting the symbol size: if the symbol
592 appears as a common symbol in a regular object, and the size in
593 the regular object is larger, we must make sure that we use the
594 larger size. This problematic case can always be avoided in C,
595 but it must be handled correctly when using Fortran shared
598 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
599 likewise for OLDDYNCOMMON and OLDDEF.
601 Note that this test is just a heuristic, and that it is quite
602 possible to have an uninitialized symbol in a shared object which
603 is really a definition, rather than a common symbol. This could
604 lead to some minor confusion when the symbol really is a common
605 symbol in some regular object. However, I think it will be
610 && (sec
->flags
& SEC_ALLOC
) != 0
611 && (sec
->flags
& SEC_LOAD
) == 0
614 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
617 newdyncommon
= false;
621 && h
->root
.type
== bfd_link_hash_defined
622 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
623 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
624 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
626 && h
->type
!= STT_FUNC
)
629 olddyncommon
= false;
631 /* It's OK to change the type if either the existing symbol or the
632 new symbol is weak unless it comes from a DT_NEEDED entry of
633 a shared object, in which case, the DT_NEEDED entry may not be
634 required at the run time. */
636 if ((! dt_needed
&& h
->root
.type
== bfd_link_hash_defweak
)
637 || h
->root
.type
== bfd_link_hash_undefweak
639 *type_change_ok
= true;
641 /* It's OK to change the size if either the existing symbol or the
642 new symbol is weak, or if the old symbol is undefined. */
645 || h
->root
.type
== bfd_link_hash_undefined
)
646 *size_change_ok
= true;
648 /* If both the old and the new symbols look like common symbols in a
649 dynamic object, set the size of the symbol to the larger of the
654 && sym
->st_size
!= h
->size
)
656 /* Since we think we have two common symbols, issue a multiple
657 common warning if desired. Note that we only warn if the
658 size is different. If the size is the same, we simply let
659 the old symbol override the new one as normally happens with
660 symbols defined in dynamic objects. */
662 if (! ((*info
->callbacks
->multiple_common
)
663 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
664 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
667 if (sym
->st_size
> h
->size
)
668 h
->size
= sym
->st_size
;
670 *size_change_ok
= true;
673 /* If we are looking at a dynamic object, and we have found a
674 definition, we need to see if the symbol was already defined by
675 some other object. If so, we want to use the existing
676 definition, and we do not want to report a multiple symbol
677 definition error; we do this by clobbering *PSEC to be
680 We treat a common symbol as a definition if the symbol in the
681 shared library is a function, since common symbols always
682 represent variables; this can cause confusion in principle, but
683 any such confusion would seem to indicate an erroneous program or
684 shared library. We also permit a common symbol in a regular
685 object to override a weak symbol in a shared object.
687 We prefer a non-weak definition in a shared library to a weak
688 definition in the executable unless it comes from a DT_NEEDED
689 entry of a shared object, in which case, the DT_NEEDED entry
690 may not be required at the run time. */
695 || (h
->root
.type
== bfd_link_hash_common
697 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
698 && (h
->root
.type
!= bfd_link_hash_defweak
700 || bind
== STB_WEAK
))
704 newdyncommon
= false;
706 *psec
= sec
= bfd_und_section_ptr
;
707 *size_change_ok
= true;
709 /* If we get here when the old symbol is a common symbol, then
710 we are explicitly letting it override a weak symbol or
711 function in a dynamic object, and we don't want to warn about
712 a type change. If the old symbol is a defined symbol, a type
713 change warning may still be appropriate. */
715 if (h
->root
.type
== bfd_link_hash_common
)
716 *type_change_ok
= true;
719 /* Handle the special case of an old common symbol merging with a
720 new symbol which looks like a common symbol in a shared object.
721 We change *PSEC and *PVALUE to make the new symbol look like a
722 common symbol, and let _bfd_generic_link_add_one_symbol will do
726 && h
->root
.type
== bfd_link_hash_common
)
730 newdyncommon
= false;
731 *pvalue
= sym
->st_size
;
732 *psec
= sec
= bfd_com_section_ptr
;
733 *size_change_ok
= true;
736 /* If the old symbol is from a dynamic object, and the new symbol is
737 a definition which is not from a dynamic object, then the new
738 symbol overrides the old symbol. Symbols from regular files
739 always take precedence over symbols from dynamic objects, even if
740 they are defined after the dynamic object in the link.
742 As above, we again permit a common symbol in a regular object to
743 override a definition in a shared object if the shared object
744 symbol is a function or is weak.
746 As above, we permit a non-weak definition in a shared object to
747 override a weak definition in a regular object. */
751 || (bfd_is_com_section (sec
)
752 && (h
->root
.type
== bfd_link_hash_defweak
753 || h
->type
== STT_FUNC
)))
756 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
758 || h
->root
.type
== bfd_link_hash_defweak
))
760 /* Change the hash table entry to undefined, and let
761 _bfd_generic_link_add_one_symbol do the right thing with the
764 h
->root
.type
= bfd_link_hash_undefined
;
765 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
766 *size_change_ok
= true;
769 olddyncommon
= false;
771 /* We again permit a type change when a common symbol may be
772 overriding a function. */
774 if (bfd_is_com_section (sec
))
775 *type_change_ok
= true;
777 /* This union may have been set to be non-NULL when this symbol
778 was seen in a dynamic object. We must force the union to be
779 NULL, so that it is correct for a regular symbol. */
781 h
->verinfo
.vertree
= NULL
;
783 /* In this special case, if H is the target of an indirection,
784 we want the caller to frob with H rather than with the
785 indirect symbol. That will permit the caller to redefine the
786 target of the indirection, rather than the indirect symbol
787 itself. FIXME: This will break the -y option if we store a
788 symbol with a different name. */
792 /* Handle the special case of a new common symbol merging with an
793 old symbol that looks like it might be a common symbol defined in
794 a shared object. Note that we have already handled the case in
795 which a new common symbol should simply override the definition
796 in the shared library. */
799 && bfd_is_com_section (sec
)
802 /* It would be best if we could set the hash table entry to a
803 common symbol, but we don't know what to use for the section
805 if (! ((*info
->callbacks
->multiple_common
)
806 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
807 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
810 /* If the predumed common symbol in the dynamic object is
811 larger, pretend that the new symbol has its size. */
813 if (h
->size
> *pvalue
)
816 /* FIXME: We no longer know the alignment required by the symbol
817 in the dynamic object, so we just wind up using the one from
818 the regular object. */
821 olddyncommon
= false;
823 h
->root
.type
= bfd_link_hash_undefined
;
824 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
826 *size_change_ok
= true;
827 *type_change_ok
= true;
829 h
->verinfo
.vertree
= NULL
;
832 /* Handle the special case of a weak definition in a regular object
833 followed by a non-weak definition in a shared object. In this
834 case, we prefer the definition in the shared object unless it
835 comes from a DT_NEEDED entry of a shared object, in which case,
836 the DT_NEEDED entry may not be required at the run time. */
839 && h
->root
.type
== bfd_link_hash_defweak
844 /* To make this work we have to frob the flags so that the rest
845 of the code does not think we are using the regular
847 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
848 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
849 else if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
850 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
851 h
->elf_link_hash_flags
&= ~ (ELF_LINK_HASH_DEF_REGULAR
852 | ELF_LINK_HASH_DEF_DYNAMIC
);
854 /* If H is the target of an indirection, we want the caller to
855 use H rather than the indirect symbol. Otherwise if we are
856 defining a new indirect symbol we will wind up attaching it
857 to the entry we are overriding. */
861 /* Handle the special case of a non-weak definition in a shared
862 object followed by a weak definition in a regular object. In
863 this case we prefer to definition in the shared object. To make
864 this work we have to tell the caller to not treat the new symbol
868 && h
->root
.type
!= bfd_link_hash_defweak
877 /* Add symbols from an ELF object file to the linker hash table. */
880 elf_link_add_object_symbols (abfd
, info
)
882 struct bfd_link_info
*info
;
884 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
885 const Elf_Internal_Sym
*,
886 const char **, flagword
*,
887 asection
**, bfd_vma
*));
888 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
889 asection
*, const Elf_Internal_Rela
*));
891 Elf_Internal_Shdr
*hdr
;
895 Elf_External_Sym
*buf
= NULL
;
896 struct elf_link_hash_entry
**sym_hash
;
898 bfd_byte
*dynver
= NULL
;
899 Elf_External_Versym
*extversym
= NULL
;
900 Elf_External_Versym
*ever
;
901 Elf_External_Dyn
*dynbuf
= NULL
;
902 struct elf_link_hash_entry
*weaks
;
903 Elf_External_Sym
*esym
;
904 Elf_External_Sym
*esymend
;
905 struct elf_backend_data
*bed
;
908 bed
= get_elf_backend_data (abfd
);
909 add_symbol_hook
= bed
->elf_add_symbol_hook
;
910 collect
= bed
->collect
;
912 if ((abfd
->flags
& DYNAMIC
) == 0)
918 /* You can't use -r against a dynamic object. Also, there's no
919 hope of using a dynamic object which does not exactly match
920 the format of the output file. */
921 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
923 bfd_set_error (bfd_error_invalid_operation
);
928 /* As a GNU extension, any input sections which are named
929 .gnu.warning.SYMBOL are treated as warning symbols for the given
930 symbol. This differs from .gnu.warning sections, which generate
931 warnings when they are included in an output file. */
936 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
940 name
= bfd_get_section_name (abfd
, s
);
941 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
946 name
+= sizeof ".gnu.warning." - 1;
948 /* If this is a shared object, then look up the symbol
949 in the hash table. If it is there, and it is already
950 been defined, then we will not be using the entry
951 from this shared object, so we don't need to warn.
952 FIXME: If we see the definition in a regular object
953 later on, we will warn, but we shouldn't. The only
954 fix is to keep track of what warnings we are supposed
955 to emit, and then handle them all at the end of the
957 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
959 struct elf_link_hash_entry
*h
;
961 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
964 /* FIXME: What about bfd_link_hash_common? */
966 && (h
->root
.type
== bfd_link_hash_defined
967 || h
->root
.type
== bfd_link_hash_defweak
))
969 /* We don't want to issue this warning. Clobber
970 the section size so that the warning does not
971 get copied into the output file. */
977 sz
= bfd_section_size (abfd
, s
);
978 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
982 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
987 if (! (_bfd_generic_link_add_one_symbol
988 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
989 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
992 if (! info
->relocateable
)
994 /* Clobber the section size so that the warning does
995 not get copied into the output file. */
1002 /* If this is a dynamic object, we always link against the .dynsym
1003 symbol table, not the .symtab symbol table. The dynamic linker
1004 will only see the .dynsym symbol table, so there is no reason to
1005 look at .symtab for a dynamic object. */
1007 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
1008 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1010 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1014 /* Read in any version definitions. */
1016 if (! _bfd_elf_slurp_version_tables (abfd
))
1019 /* Read in the symbol versions, but don't bother to convert them
1020 to internal format. */
1021 if (elf_dynversym (abfd
) != 0)
1023 Elf_Internal_Shdr
*versymhdr
;
1025 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1026 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
1027 if (extversym
== NULL
)
1029 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
1030 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
1031 != versymhdr
->sh_size
))
1036 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1038 /* The sh_info field of the symtab header tells us where the
1039 external symbols start. We don't care about the local symbols at
1041 if (elf_bad_symtab (abfd
))
1043 extsymcount
= symcount
;
1048 extsymcount
= symcount
- hdr
->sh_info
;
1049 extsymoff
= hdr
->sh_info
;
1052 buf
= ((Elf_External_Sym
*)
1053 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
1054 if (buf
== NULL
&& extsymcount
!= 0)
1057 /* We store a pointer to the hash table entry for each external
1059 sym_hash
= ((struct elf_link_hash_entry
**)
1061 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
1062 if (sym_hash
== NULL
)
1064 elf_sym_hashes (abfd
) = sym_hash
;
1070 /* If we are creating a shared library, create all the dynamic
1071 sections immediately. We need to attach them to something,
1072 so we attach them to this BFD, provided it is the right
1073 format. FIXME: If there are no input BFD's of the same
1074 format as the output, we can't make a shared library. */
1076 && ! elf_hash_table (info
)->dynamic_sections_created
1077 && abfd
->xvec
== info
->hash
->creator
)
1079 if (! elf_link_create_dynamic_sections (abfd
, info
))
1088 bfd_size_type oldsize
;
1089 bfd_size_type strindex
;
1091 /* Find the name to use in a DT_NEEDED entry that refers to this
1092 object. If the object has a DT_SONAME entry, we use it.
1093 Otherwise, if the generic linker stuck something in
1094 elf_dt_name, we use that. Otherwise, we just use the file
1095 name. If the generic linker put a null string into
1096 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1097 there is a DT_SONAME entry. */
1099 name
= bfd_get_filename (abfd
);
1100 if (elf_dt_name (abfd
) != NULL
)
1102 name
= elf_dt_name (abfd
);
1105 if (elf_dt_soname (abfd
) != NULL
)
1111 s
= bfd_get_section_by_name (abfd
, ".dynamic");
1114 Elf_External_Dyn
*extdyn
;
1115 Elf_External_Dyn
*extdynend
;
1121 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
1125 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
1126 (file_ptr
) 0, s
->_raw_size
))
1129 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1132 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1135 /* The shared libraries distributed with hpux11 have a bogus
1136 sh_link field for the ".dynamic" section. This code detects
1137 when LINK refers to a section that is not a string table and
1138 tries to find the string table for the ".dynsym" section
1140 Elf_Internal_Shdr
*hdr
= elf_elfsections (abfd
)[link
];
1141 if (hdr
->sh_type
!= SHT_STRTAB
)
1143 asection
*s
= bfd_get_section_by_name (abfd
, ".dynsym");
1144 int elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1147 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1152 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
1155 for (; extdyn
< extdynend
; extdyn
++)
1157 Elf_Internal_Dyn dyn
;
1159 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1160 if (dyn
.d_tag
== DT_SONAME
)
1162 name
= bfd_elf_string_from_elf_section (abfd
, link
,
1167 if (dyn
.d_tag
== DT_NEEDED
)
1169 struct bfd_link_needed_list
*n
, **pn
;
1172 n
= ((struct bfd_link_needed_list
*)
1173 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1174 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1176 if (n
== NULL
|| fnm
== NULL
)
1178 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1185 for (pn
= &elf_hash_table (info
)->needed
;
1191 if (dyn
.d_tag
== DT_RUNPATH
)
1193 struct bfd_link_needed_list
*n
, **pn
;
1196 /* When we see DT_RPATH before DT_RUNPATH, we have
1197 to clear runpath. Do _NOT_ bfd_release, as that
1198 frees all more recently bfd_alloc'd blocks as
1200 if (rpath
&& elf_hash_table (info
)->runpath
)
1201 elf_hash_table (info
)->runpath
= NULL
;
1203 n
= ((struct bfd_link_needed_list
*)
1204 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1205 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1207 if (n
== NULL
|| fnm
== NULL
)
1209 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1216 for (pn
= &elf_hash_table (info
)->runpath
;
1224 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1225 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
1227 struct bfd_link_needed_list
*n
, **pn
;
1230 n
= ((struct bfd_link_needed_list
*)
1231 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1232 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1234 if (n
== NULL
|| fnm
== NULL
)
1236 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1243 for (pn
= &elf_hash_table (info
)->runpath
;
1256 /* We do not want to include any of the sections in a dynamic
1257 object in the output file. We hack by simply clobbering the
1258 list of sections in the BFD. This could be handled more
1259 cleanly by, say, a new section flag; the existing
1260 SEC_NEVER_LOAD flag is not the one we want, because that one
1261 still implies that the section takes up space in the output
1263 abfd
->sections
= NULL
;
1264 abfd
->section_count
= 0;
1266 /* If this is the first dynamic object found in the link, create
1267 the special sections required for dynamic linking. */
1268 if (! elf_hash_table (info
)->dynamic_sections_created
)
1270 if (! elf_link_create_dynamic_sections (abfd
, info
))
1276 /* Add a DT_NEEDED entry for this dynamic object. */
1277 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1278 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
1280 if (strindex
== (bfd_size_type
) -1)
1283 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1286 Elf_External_Dyn
*dyncon
, *dynconend
;
1288 /* The hash table size did not change, which means that
1289 the dynamic object name was already entered. If we
1290 have already included this dynamic object in the
1291 link, just ignore it. There is no reason to include
1292 a particular dynamic object more than once. */
1293 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1295 BFD_ASSERT (sdyn
!= NULL
);
1297 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1298 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1300 for (; dyncon
< dynconend
; dyncon
++)
1302 Elf_Internal_Dyn dyn
;
1304 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
1306 if (dyn
.d_tag
== DT_NEEDED
1307 && dyn
.d_un
.d_val
== strindex
)
1311 if (extversym
!= NULL
)
1318 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1322 /* Save the SONAME, if there is one, because sometimes the
1323 linker emulation code will need to know it. */
1325 name
= basename (bfd_get_filename (abfd
));
1326 elf_dt_name (abfd
) = name
;
1330 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
1332 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
1333 != extsymcount
* sizeof (Elf_External_Sym
)))
1338 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1339 esymend
= buf
+ extsymcount
;
1342 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1344 Elf_Internal_Sym sym
;
1350 struct elf_link_hash_entry
*h
;
1352 boolean size_change_ok
, type_change_ok
;
1353 boolean new_weakdef
;
1354 unsigned int old_alignment
;
1356 elf_swap_symbol_in (abfd
, esym
, &sym
);
1358 flags
= BSF_NO_FLAGS
;
1360 value
= sym
.st_value
;
1363 bind
= ELF_ST_BIND (sym
.st_info
);
1364 if (bind
== STB_LOCAL
)
1366 /* This should be impossible, since ELF requires that all
1367 global symbols follow all local symbols, and that sh_info
1368 point to the first global symbol. Unfortunatealy, Irix 5
1372 else if (bind
== STB_GLOBAL
)
1374 if (sym
.st_shndx
!= SHN_UNDEF
1375 && sym
.st_shndx
!= SHN_COMMON
)
1378 else if (bind
== STB_WEAK
)
1382 /* Leave it up to the processor backend. */
1385 if (sym
.st_shndx
== SHN_UNDEF
)
1386 sec
= bfd_und_section_ptr
;
1387 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1389 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1391 sec
= bfd_abs_section_ptr
;
1392 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1395 else if (sym
.st_shndx
== SHN_ABS
)
1396 sec
= bfd_abs_section_ptr
;
1397 else if (sym
.st_shndx
== SHN_COMMON
)
1399 sec
= bfd_com_section_ptr
;
1400 /* What ELF calls the size we call the value. What ELF
1401 calls the value we call the alignment. */
1402 value
= sym
.st_size
;
1406 /* Leave it up to the processor backend. */
1409 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1410 if (name
== (const char *) NULL
)
1413 if (add_symbol_hook
)
1415 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1419 /* The hook function sets the name to NULL if this symbol
1420 should be skipped for some reason. */
1421 if (name
== (const char *) NULL
)
1425 /* Sanity check that all possibilities were handled. */
1426 if (sec
== (asection
*) NULL
)
1428 bfd_set_error (bfd_error_bad_value
);
1432 if (bfd_is_und_section (sec
)
1433 || bfd_is_com_section (sec
))
1438 size_change_ok
= false;
1439 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1441 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1443 Elf_Internal_Versym iver
;
1444 unsigned int vernum
= 0;
1449 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1450 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1452 /* If this is a hidden symbol, or if it is not version
1453 1, we append the version name to the symbol name.
1454 However, we do not modify a non-hidden absolute
1455 symbol, because it might be the version symbol
1456 itself. FIXME: What if it isn't? */
1457 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1458 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1461 int namelen
, newlen
;
1464 if (sym
.st_shndx
!= SHN_UNDEF
)
1466 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1468 (*_bfd_error_handler
)
1469 (_("%s: %s: invalid version %u (max %d)"),
1470 bfd_get_filename (abfd
), name
, vernum
,
1471 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1472 bfd_set_error (bfd_error_bad_value
);
1475 else if (vernum
> 1)
1477 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1483 /* We cannot simply test for the number of
1484 entries in the VERNEED section since the
1485 numbers for the needed versions do not start
1487 Elf_Internal_Verneed
*t
;
1490 for (t
= elf_tdata (abfd
)->verref
;
1494 Elf_Internal_Vernaux
*a
;
1496 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1498 if (a
->vna_other
== vernum
)
1500 verstr
= a
->vna_nodename
;
1509 (*_bfd_error_handler
)
1510 (_("%s: %s: invalid needed version %d"),
1511 bfd_get_filename (abfd
), name
, vernum
);
1512 bfd_set_error (bfd_error_bad_value
);
1517 namelen
= strlen (name
);
1518 newlen
= namelen
+ strlen (verstr
) + 2;
1519 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1522 newname
= (char *) bfd_alloc (abfd
, newlen
);
1523 if (newname
== NULL
)
1525 strcpy (newname
, name
);
1526 p
= newname
+ namelen
;
1528 /* If this is a defined non-hidden version symbol,
1529 we add another @ to the name. This indicates the
1530 default version of the symbol. */
1531 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1532 && sym
.st_shndx
!= SHN_UNDEF
)
1540 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1541 sym_hash
, &override
, &type_change_ok
,
1542 &size_change_ok
, dt_needed
))
1549 while (h
->root
.type
== bfd_link_hash_indirect
1550 || h
->root
.type
== bfd_link_hash_warning
)
1551 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1553 /* Remember the old alignment if this is a common symbol, so
1554 that we don't reduce the alignment later on. We can't
1555 check later, because _bfd_generic_link_add_one_symbol
1556 will set a default for the alignment which we want to
1558 if (h
->root
.type
== bfd_link_hash_common
)
1559 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1561 if (elf_tdata (abfd
)->verdef
!= NULL
1565 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1568 if (! (_bfd_generic_link_add_one_symbol
1569 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1570 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1574 while (h
->root
.type
== bfd_link_hash_indirect
1575 || h
->root
.type
== bfd_link_hash_warning
)
1576 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1579 new_weakdef
= false;
1582 && (flags
& BSF_WEAK
) != 0
1583 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1584 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1585 && h
->weakdef
== NULL
)
1587 /* Keep a list of all weak defined non function symbols from
1588 a dynamic object, using the weakdef field. Later in this
1589 function we will set the weakdef field to the correct
1590 value. We only put non-function symbols from dynamic
1591 objects on this list, because that happens to be the only
1592 time we need to know the normal symbol corresponding to a
1593 weak symbol, and the information is time consuming to
1594 figure out. If the weakdef field is not already NULL,
1595 then this symbol was already defined by some previous
1596 dynamic object, and we will be using that previous
1597 definition anyhow. */
1604 /* Set the alignment of a common symbol. */
1605 if (sym
.st_shndx
== SHN_COMMON
1606 && h
->root
.type
== bfd_link_hash_common
)
1610 align
= bfd_log2 (sym
.st_value
);
1611 if (align
> old_alignment
1612 /* Permit an alignment power of zero if an alignment of one
1613 is specified and no other alignments have been specified. */
1614 || (sym
.st_value
== 1 && old_alignment
== 0))
1615 h
->root
.u
.c
.p
->alignment_power
= align
;
1618 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1624 /* Remember the symbol size and type. */
1625 if (sym
.st_size
!= 0
1626 && (definition
|| h
->size
== 0))
1628 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1629 (*_bfd_error_handler
)
1630 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1631 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1632 bfd_get_filename (abfd
));
1634 h
->size
= sym
.st_size
;
1637 /* If this is a common symbol, then we always want H->SIZE
1638 to be the size of the common symbol. The code just above
1639 won't fix the size if a common symbol becomes larger. We
1640 don't warn about a size change here, because that is
1641 covered by --warn-common. */
1642 if (h
->root
.type
== bfd_link_hash_common
)
1643 h
->size
= h
->root
.u
.c
.size
;
1645 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1646 && (definition
|| h
->type
== STT_NOTYPE
))
1648 if (h
->type
!= STT_NOTYPE
1649 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1650 && ! type_change_ok
)
1651 (*_bfd_error_handler
)
1652 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1653 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1654 bfd_get_filename (abfd
));
1656 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1659 /* If st_other has a processor-specific meaning, specific code
1660 might be needed here. */
1661 if (sym
.st_other
!= 0)
1663 /* Combine visibilities, using the most constraining one. */
1664 unsigned char hvis
= ELF_ST_VISIBILITY (h
->other
);
1665 unsigned char symvis
= ELF_ST_VISIBILITY (sym
.st_other
);
1667 if (symvis
&& (hvis
> symvis
|| hvis
== 0))
1668 h
->other
= sym
.st_other
;
1670 /* If neither has visibility, use the st_other of the
1671 definition. This is an arbitrary choice, since the
1672 other bits have no general meaning. */
1673 if (!symvis
&& !hvis
1674 && (definition
|| h
->other
== 0))
1675 h
->other
= sym
.st_other
;
1678 /* Set a flag in the hash table entry indicating the type of
1679 reference or definition we just found. Keep a count of
1680 the number of dynamic symbols we find. A dynamic symbol
1681 is one which is referenced or defined by both a regular
1682 object and a shared object. */
1683 old_flags
= h
->elf_link_hash_flags
;
1689 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1690 if (bind
!= STB_WEAK
)
1691 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1694 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1696 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1697 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1703 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1705 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1706 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1707 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1708 || (h
->weakdef
!= NULL
1710 && h
->weakdef
->dynindx
!= -1))
1714 h
->elf_link_hash_flags
|= new_flag
;
1716 /* If this symbol has a version, and it is the default
1717 version, we create an indirect symbol from the default
1718 name to the fully decorated name. This will cause
1719 external references which do not specify a version to be
1720 bound to this version of the symbol. */
1721 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
1725 p
= strchr (name
, ELF_VER_CHR
);
1726 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1729 struct elf_link_hash_entry
*hi
;
1732 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1734 if (shortname
== NULL
)
1736 strncpy (shortname
, name
, p
- name
);
1737 shortname
[p
- name
] = '\0';
1739 /* We are going to create a new symbol. Merge it
1740 with any existing symbol with this name. For the
1741 purposes of the merge, act as though we were
1742 defining the symbol we just defined, although we
1743 actually going to define an indirect symbol. */
1744 type_change_ok
= false;
1745 size_change_ok
= false;
1746 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1747 &value
, &hi
, &override
,
1749 &size_change_ok
, dt_needed
))
1754 if (! (_bfd_generic_link_add_one_symbol
1755 (info
, abfd
, shortname
, BSF_INDIRECT
,
1756 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1757 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1762 /* In this case the symbol named SHORTNAME is
1763 overriding the indirect symbol we want to
1764 add. We were planning on making SHORTNAME an
1765 indirect symbol referring to NAME. SHORTNAME
1766 is the name without a version. NAME is the
1767 fully versioned name, and it is the default
1770 Overriding means that we already saw a
1771 definition for the symbol SHORTNAME in a
1772 regular object, and it is overriding the
1773 symbol defined in the dynamic object.
1775 When this happens, we actually want to change
1776 NAME, the symbol we just added, to refer to
1777 SHORTNAME. This will cause references to
1778 NAME in the shared object to become
1779 references to SHORTNAME in the regular
1780 object. This is what we expect when we
1781 override a function in a shared object: that
1782 the references in the shared object will be
1783 mapped to the definition in the regular
1786 while (hi
->root
.type
== bfd_link_hash_indirect
1787 || hi
->root
.type
== bfd_link_hash_warning
)
1788 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1790 h
->root
.type
= bfd_link_hash_indirect
;
1791 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1792 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1794 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1795 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1796 if (hi
->elf_link_hash_flags
1797 & (ELF_LINK_HASH_REF_REGULAR
1798 | ELF_LINK_HASH_DEF_REGULAR
))
1800 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1806 /* Now set HI to H, so that the following code
1807 will set the other fields correctly. */
1811 /* If there is a duplicate definition somewhere,
1812 then HI may not point to an indirect symbol. We
1813 will have reported an error to the user in that
1816 if (hi
->root
.type
== bfd_link_hash_indirect
)
1818 struct elf_link_hash_entry
*ht
;
1820 /* If the symbol became indirect, then we assume
1821 that we have not seen a definition before. */
1822 BFD_ASSERT ((hi
->elf_link_hash_flags
1823 & (ELF_LINK_HASH_DEF_DYNAMIC
1824 | ELF_LINK_HASH_DEF_REGULAR
))
1827 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1828 (*bed
->elf_backend_copy_indirect_symbol
) (ht
, hi
);
1830 /* See if the new flags lead us to realize that
1831 the symbol must be dynamic. */
1837 || ((hi
->elf_link_hash_flags
1838 & ELF_LINK_HASH_REF_DYNAMIC
)
1844 if ((hi
->elf_link_hash_flags
1845 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1851 /* We also need to define an indirection from the
1852 nondefault version of the symbol. */
1854 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1856 if (shortname
== NULL
)
1858 strncpy (shortname
, name
, p
- name
);
1859 strcpy (shortname
+ (p
- name
), p
+ 1);
1861 /* Once again, merge with any existing symbol. */
1862 type_change_ok
= false;
1863 size_change_ok
= false;
1864 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1865 &value
, &hi
, &override
,
1867 &size_change_ok
, dt_needed
))
1872 /* Here SHORTNAME is a versioned name, so we
1873 don't expect to see the type of override we
1874 do in the case above. */
1875 (*_bfd_error_handler
)
1876 (_("%s: warning: unexpected redefinition of `%s'"),
1877 bfd_get_filename (abfd
), shortname
);
1881 if (! (_bfd_generic_link_add_one_symbol
1882 (info
, abfd
, shortname
, BSF_INDIRECT
,
1883 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1884 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1887 /* If there is a duplicate definition somewhere,
1888 then HI may not point to an indirect symbol.
1889 We will have reported an error to the user in
1892 if (hi
->root
.type
== bfd_link_hash_indirect
)
1894 /* If the symbol became indirect, then we
1895 assume that we have not seen a definition
1897 BFD_ASSERT ((hi
->elf_link_hash_flags
1898 & (ELF_LINK_HASH_DEF_DYNAMIC
1899 | ELF_LINK_HASH_DEF_REGULAR
))
1902 (*bed
->elf_backend_copy_indirect_symbol
) (h
, hi
);
1904 /* See if the new flags lead us to realize
1905 that the symbol must be dynamic. */
1911 || ((hi
->elf_link_hash_flags
1912 & ELF_LINK_HASH_REF_DYNAMIC
)
1918 if ((hi
->elf_link_hash_flags
1919 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1928 if (dynsym
&& h
->dynindx
== -1)
1930 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1932 if (h
->weakdef
!= NULL
1934 && h
->weakdef
->dynindx
== -1)
1936 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1941 else if (dynsym
&& h
->dynindx
!= -1)
1942 /* If the symbol already has a dynamic index, but
1943 visibility says it should not be visible, turn it into
1945 switch (ELF_ST_VISIBILITY (h
->other
))
1949 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
1950 (*bed
->elf_backend_hide_symbol
) (info
, h
);
1954 if (dt_needed
&& definition
1955 && (h
->elf_link_hash_flags
1956 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1958 bfd_size_type oldsize
;
1959 bfd_size_type strindex
;
1961 /* The symbol from a DT_NEEDED object is referenced from
1962 the regular object to create a dynamic executable. We
1963 have to make sure there is a DT_NEEDED entry for it. */
1966 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1967 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
1968 elf_dt_soname (abfd
),
1970 if (strindex
== (bfd_size_type
) -1)
1974 == _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1977 Elf_External_Dyn
*dyncon
, *dynconend
;
1979 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1981 BFD_ASSERT (sdyn
!= NULL
);
1983 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1984 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1986 for (; dyncon
< dynconend
; dyncon
++)
1988 Elf_Internal_Dyn dyn
;
1990 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
,
1992 BFD_ASSERT (dyn
.d_tag
!= DT_NEEDED
||
1993 dyn
.d_un
.d_val
!= strindex
);
1997 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
2003 /* Now set the weakdefs field correctly for all the weak defined
2004 symbols we found. The only way to do this is to search all the
2005 symbols. Since we only need the information for non functions in
2006 dynamic objects, that's the only time we actually put anything on
2007 the list WEAKS. We need this information so that if a regular
2008 object refers to a symbol defined weakly in a dynamic object, the
2009 real symbol in the dynamic object is also put in the dynamic
2010 symbols; we also must arrange for both symbols to point to the
2011 same memory location. We could handle the general case of symbol
2012 aliasing, but a general symbol alias can only be generated in
2013 assembler code, handling it correctly would be very time
2014 consuming, and other ELF linkers don't handle general aliasing
2016 while (weaks
!= NULL
)
2018 struct elf_link_hash_entry
*hlook
;
2021 struct elf_link_hash_entry
**hpp
;
2022 struct elf_link_hash_entry
**hppend
;
2025 weaks
= hlook
->weakdef
;
2026 hlook
->weakdef
= NULL
;
2028 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
2029 || hlook
->root
.type
== bfd_link_hash_defweak
2030 || hlook
->root
.type
== bfd_link_hash_common
2031 || hlook
->root
.type
== bfd_link_hash_indirect
);
2032 slook
= hlook
->root
.u
.def
.section
;
2033 vlook
= hlook
->root
.u
.def
.value
;
2035 hpp
= elf_sym_hashes (abfd
);
2036 hppend
= hpp
+ extsymcount
;
2037 for (; hpp
< hppend
; hpp
++)
2039 struct elf_link_hash_entry
*h
;
2042 if (h
!= NULL
&& h
!= hlook
2043 && h
->root
.type
== bfd_link_hash_defined
2044 && h
->root
.u
.def
.section
== slook
2045 && h
->root
.u
.def
.value
== vlook
)
2049 /* If the weak definition is in the list of dynamic
2050 symbols, make sure the real definition is put there
2052 if (hlook
->dynindx
!= -1
2053 && h
->dynindx
== -1)
2055 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2059 /* If the real definition is in the list of dynamic
2060 symbols, make sure the weak definition is put there
2061 as well. If we don't do this, then the dynamic
2062 loader might not merge the entries for the real
2063 definition and the weak definition. */
2064 if (h
->dynindx
!= -1
2065 && hlook
->dynindx
== -1)
2067 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
2082 if (extversym
!= NULL
)
2088 /* If this object is the same format as the output object, and it is
2089 not a shared library, then let the backend look through the
2092 This is required to build global offset table entries and to
2093 arrange for dynamic relocs. It is not required for the
2094 particular common case of linking non PIC code, even when linking
2095 against shared libraries, but unfortunately there is no way of
2096 knowing whether an object file has been compiled PIC or not.
2097 Looking through the relocs is not particularly time consuming.
2098 The problem is that we must either (1) keep the relocs in memory,
2099 which causes the linker to require additional runtime memory or
2100 (2) read the relocs twice from the input file, which wastes time.
2101 This would be a good case for using mmap.
2103 I have no idea how to handle linking PIC code into a file of a
2104 different format. It probably can't be done. */
2105 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
2107 && abfd
->xvec
== info
->hash
->creator
2108 && check_relocs
!= NULL
)
2112 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2114 Elf_Internal_Rela
*internal_relocs
;
2117 if ((o
->flags
& SEC_RELOC
) == 0
2118 || o
->reloc_count
== 0
2119 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
2120 && (o
->flags
& SEC_DEBUGGING
) != 0)
2121 || bfd_is_abs_section (o
->output_section
))
2124 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
2125 (abfd
, o
, (PTR
) NULL
,
2126 (Elf_Internal_Rela
*) NULL
,
2127 info
->keep_memory
));
2128 if (internal_relocs
== NULL
)
2131 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
2133 if (! info
->keep_memory
)
2134 free (internal_relocs
);
2141 /* If this is a non-traditional, non-relocateable link, try to
2142 optimize the handling of the .stab/.stabstr sections. */
2144 && ! info
->relocateable
2145 && ! info
->traditional_format
2146 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
2147 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
2149 asection
*stab
, *stabstr
;
2151 stab
= bfd_get_section_by_name (abfd
, ".stab");
2154 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
2156 if (stabstr
!= NULL
)
2158 struct bfd_elf_section_data
*secdata
;
2160 secdata
= elf_section_data (stab
);
2161 if (! _bfd_link_section_stabs (abfd
,
2162 &elf_hash_table (info
)->stab_info
,
2164 &secdata
->stab_info
))
2170 if (! info
->relocateable
&& ! dynamic
)
2174 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
2175 if ((s
->flags
& SEC_MERGE
)
2176 && ! _bfd_merge_section (abfd
,
2177 &elf_hash_table (info
)->merge_info
,
2178 s
, &elf_section_data (s
)->merge_info
))
2191 if (extversym
!= NULL
)
2196 /* Create some sections which will be filled in with dynamic linking
2197 information. ABFD is an input file which requires dynamic sections
2198 to be created. The dynamic sections take up virtual memory space
2199 when the final executable is run, so we need to create them before
2200 addresses are assigned to the output sections. We work out the
2201 actual contents and size of these sections later. */
2204 elf_link_create_dynamic_sections (abfd
, info
)
2206 struct bfd_link_info
*info
;
2209 register asection
*s
;
2210 struct elf_link_hash_entry
*h
;
2211 struct elf_backend_data
*bed
;
2213 if (elf_hash_table (info
)->dynamic_sections_created
)
2216 /* Make sure that all dynamic sections use the same input BFD. */
2217 if (elf_hash_table (info
)->dynobj
== NULL
)
2218 elf_hash_table (info
)->dynobj
= abfd
;
2220 abfd
= elf_hash_table (info
)->dynobj
;
2222 /* Note that we set the SEC_IN_MEMORY flag for all of these
2224 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
2225 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2227 /* A dynamically linked executable has a .interp section, but a
2228 shared library does not. */
2231 s
= bfd_make_section (abfd
, ".interp");
2233 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2237 /* Create sections to hold version informations. These are removed
2238 if they are not needed. */
2239 s
= bfd_make_section (abfd
, ".gnu.version_d");
2241 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2242 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2245 s
= bfd_make_section (abfd
, ".gnu.version");
2247 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2248 || ! bfd_set_section_alignment (abfd
, s
, 1))
2251 s
= bfd_make_section (abfd
, ".gnu.version_r");
2253 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2254 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2257 s
= bfd_make_section (abfd
, ".dynsym");
2259 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2260 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2263 s
= bfd_make_section (abfd
, ".dynstr");
2265 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2268 /* Create a strtab to hold the dynamic symbol names. */
2269 if (elf_hash_table (info
)->dynstr
== NULL
)
2271 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
2272 if (elf_hash_table (info
)->dynstr
== NULL
)
2276 s
= bfd_make_section (abfd
, ".dynamic");
2278 || ! bfd_set_section_flags (abfd
, s
, flags
)
2279 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2282 /* The special symbol _DYNAMIC is always set to the start of the
2283 .dynamic section. This call occurs before we have processed the
2284 symbols for any dynamic object, so we don't have to worry about
2285 overriding a dynamic definition. We could set _DYNAMIC in a
2286 linker script, but we only want to define it if we are, in fact,
2287 creating a .dynamic section. We don't want to define it if there
2288 is no .dynamic section, since on some ELF platforms the start up
2289 code examines it to decide how to initialize the process. */
2291 if (! (_bfd_generic_link_add_one_symbol
2292 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2293 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2294 (struct bfd_link_hash_entry
**) &h
)))
2296 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2297 h
->type
= STT_OBJECT
;
2300 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2303 bed
= get_elf_backend_data (abfd
);
2305 s
= bfd_make_section (abfd
, ".hash");
2307 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2308 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2310 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2312 /* Let the backend create the rest of the sections. This lets the
2313 backend set the right flags. The backend will normally create
2314 the .got and .plt sections. */
2315 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2318 elf_hash_table (info
)->dynamic_sections_created
= true;
2323 /* Add an entry to the .dynamic table. */
2326 elf_add_dynamic_entry (info
, tag
, val
)
2327 struct bfd_link_info
*info
;
2331 Elf_Internal_Dyn dyn
;
2335 bfd_byte
*newcontents
;
2337 dynobj
= elf_hash_table (info
)->dynobj
;
2339 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2340 BFD_ASSERT (s
!= NULL
);
2342 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2343 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2344 if (newcontents
== NULL
)
2348 dyn
.d_un
.d_val
= val
;
2349 elf_swap_dyn_out (dynobj
, &dyn
,
2350 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2352 s
->_raw_size
= newsize
;
2353 s
->contents
= newcontents
;
2358 /* Record a new local dynamic symbol. */
2361 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2362 struct bfd_link_info
*info
;
2366 struct elf_link_local_dynamic_entry
*entry
;
2367 struct elf_link_hash_table
*eht
;
2368 struct bfd_strtab_hash
*dynstr
;
2369 Elf_External_Sym esym
;
2370 unsigned long dynstr_index
;
2373 /* See if the entry exists already. */
2374 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2375 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2378 entry
= (struct elf_link_local_dynamic_entry
*)
2379 bfd_alloc (input_bfd
, sizeof (*entry
));
2383 /* Go find the symbol, so that we can find it's name. */
2384 if (bfd_seek (input_bfd
,
2385 (elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
2386 + input_indx
* sizeof (Elf_External_Sym
)),
2388 || (bfd_read (&esym
, sizeof (Elf_External_Sym
), 1, input_bfd
)
2389 != sizeof (Elf_External_Sym
)))
2391 elf_swap_symbol_in (input_bfd
, &esym
, &entry
->isym
);
2393 name
= (bfd_elf_string_from_elf_section
2394 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2395 entry
->isym
.st_name
));
2397 dynstr
= elf_hash_table (info
)->dynstr
;
2400 /* Create a strtab to hold the dynamic symbol names. */
2401 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_stringtab_init ();
2406 dynstr_index
= _bfd_stringtab_add (dynstr
, name
, true, false);
2407 if (dynstr_index
== (unsigned long) -1)
2409 entry
->isym
.st_name
= dynstr_index
;
2411 eht
= elf_hash_table (info
);
2413 entry
->next
= eht
->dynlocal
;
2414 eht
->dynlocal
= entry
;
2415 entry
->input_bfd
= input_bfd
;
2416 entry
->input_indx
= input_indx
;
2419 /* Whatever binding the symbol had before, it's now local. */
2421 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2423 /* The dynindx will be set at the end of size_dynamic_sections. */
2428 /* Read and swap the relocs from the section indicated by SHDR. This
2429 may be either a REL or a RELA section. The relocations are
2430 translated into RELA relocations and stored in INTERNAL_RELOCS,
2431 which should have already been allocated to contain enough space.
2432 The EXTERNAL_RELOCS are a buffer where the external form of the
2433 relocations should be stored.
2435 Returns false if something goes wrong. */
2438 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2441 Elf_Internal_Shdr
*shdr
;
2442 PTR external_relocs
;
2443 Elf_Internal_Rela
*internal_relocs
;
2445 struct elf_backend_data
*bed
;
2447 /* If there aren't any relocations, that's OK. */
2451 /* Position ourselves at the start of the section. */
2452 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2455 /* Read the relocations. */
2456 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2460 bed
= get_elf_backend_data (abfd
);
2462 /* Convert the external relocations to the internal format. */
2463 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2465 Elf_External_Rel
*erel
;
2466 Elf_External_Rel
*erelend
;
2467 Elf_Internal_Rela
*irela
;
2468 Elf_Internal_Rel
*irel
;
2470 erel
= (Elf_External_Rel
*) external_relocs
;
2471 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2472 irela
= internal_relocs
;
2473 irel
= bfd_alloc (abfd
, (bed
->s
->int_rels_per_ext_rel
2474 * sizeof (Elf_Internal_Rel
)));
2475 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2479 if (bed
->s
->swap_reloc_in
)
2480 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2482 elf_swap_reloc_in (abfd
, erel
, irel
);
2484 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2486 irela
[i
].r_offset
= irel
[i
].r_offset
;
2487 irela
[i
].r_info
= irel
[i
].r_info
;
2488 irela
[i
].r_addend
= 0;
2494 Elf_External_Rela
*erela
;
2495 Elf_External_Rela
*erelaend
;
2496 Elf_Internal_Rela
*irela
;
2498 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2500 erela
= (Elf_External_Rela
*) external_relocs
;
2501 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2502 irela
= internal_relocs
;
2503 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2505 if (bed
->s
->swap_reloca_in
)
2506 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2508 elf_swap_reloca_in (abfd
, erela
, irela
);
2515 /* Read and swap the relocs for a section O. They may have been
2516 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2517 not NULL, they are used as buffers to read into. They are known to
2518 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2519 the return value is allocated using either malloc or bfd_alloc,
2520 according to the KEEP_MEMORY argument. If O has two relocation
2521 sections (both REL and RELA relocations), then the REL_HDR
2522 relocations will appear first in INTERNAL_RELOCS, followed by the
2523 REL_HDR2 relocations. */
2526 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2530 PTR external_relocs
;
2531 Elf_Internal_Rela
*internal_relocs
;
2532 boolean keep_memory
;
2534 Elf_Internal_Shdr
*rel_hdr
;
2536 Elf_Internal_Rela
*alloc2
= NULL
;
2537 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2539 if (elf_section_data (o
)->relocs
!= NULL
)
2540 return elf_section_data (o
)->relocs
;
2542 if (o
->reloc_count
== 0)
2545 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2547 if (internal_relocs
== NULL
)
2551 size
= (o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
2552 * sizeof (Elf_Internal_Rela
));
2554 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2556 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2557 if (internal_relocs
== NULL
)
2561 if (external_relocs
== NULL
)
2563 size_t size
= (size_t) rel_hdr
->sh_size
;
2565 if (elf_section_data (o
)->rel_hdr2
)
2566 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2567 alloc1
= (PTR
) bfd_malloc (size
);
2570 external_relocs
= alloc1
;
2573 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2577 if (!elf_link_read_relocs_from_section
2579 elf_section_data (o
)->rel_hdr2
,
2580 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2581 internal_relocs
+ (rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
2582 * bed
->s
->int_rels_per_ext_rel
)))
2585 /* Cache the results for next time, if we can. */
2587 elf_section_data (o
)->relocs
= internal_relocs
;
2592 /* Don't free alloc2, since if it was allocated we are passing it
2593 back (under the name of internal_relocs). */
2595 return internal_relocs
;
2605 /* Record an assignment to a symbol made by a linker script. We need
2606 this in case some dynamic object refers to this symbol. */
2610 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2611 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2612 struct bfd_link_info
*info
;
2616 struct elf_link_hash_entry
*h
;
2618 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2621 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2625 if (h
->root
.type
== bfd_link_hash_new
)
2626 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2628 /* If this symbol is being provided by the linker script, and it is
2629 currently defined by a dynamic object, but not by a regular
2630 object, then mark it as undefined so that the generic linker will
2631 force the correct value. */
2633 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2634 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2635 h
->root
.type
= bfd_link_hash_undefined
;
2637 /* If this symbol is not being provided by the linker script, and it is
2638 currently defined by a dynamic object, but not by a regular object,
2639 then clear out any version information because the symbol will not be
2640 associated with the dynamic object any more. */
2642 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2643 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2644 h
->verinfo
.verdef
= NULL
;
2646 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2648 /* When possible, keep the original type of the symbol */
2649 if (h
->type
== STT_NOTYPE
)
2650 h
->type
= STT_OBJECT
;
2652 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2653 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2655 && h
->dynindx
== -1)
2657 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2660 /* If this is a weak defined symbol, and we know a corresponding
2661 real symbol from the same dynamic object, make sure the real
2662 symbol is also made into a dynamic symbol. */
2663 if (h
->weakdef
!= NULL
2664 && h
->weakdef
->dynindx
== -1)
2666 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2674 /* This structure is used to pass information to
2675 elf_link_assign_sym_version. */
2677 struct elf_assign_sym_version_info
2681 /* General link information. */
2682 struct bfd_link_info
*info
;
2684 struct bfd_elf_version_tree
*verdefs
;
2685 /* Whether we are exporting all dynamic symbols. */
2686 boolean export_dynamic
;
2687 /* Whether we had a failure. */
2691 /* This structure is used to pass information to
2692 elf_link_find_version_dependencies. */
2694 struct elf_find_verdep_info
2698 /* General link information. */
2699 struct bfd_link_info
*info
;
2700 /* The number of dependencies. */
2702 /* Whether we had a failure. */
2706 /* Array used to determine the number of hash table buckets to use
2707 based on the number of symbols there are. If there are fewer than
2708 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2709 fewer than 37 we use 17 buckets, and so forth. We never use more
2710 than 32771 buckets. */
2712 static const size_t elf_buckets
[] =
2714 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2718 /* Compute bucket count for hashing table. We do not use a static set
2719 of possible tables sizes anymore. Instead we determine for all
2720 possible reasonable sizes of the table the outcome (i.e., the
2721 number of collisions etc) and choose the best solution. The
2722 weighting functions are not too simple to allow the table to grow
2723 without bounds. Instead one of the weighting factors is the size.
2724 Therefore the result is always a good payoff between few collisions
2725 (= short chain lengths) and table size. */
2727 compute_bucket_count (info
)
2728 struct bfd_link_info
*info
;
2730 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2731 size_t best_size
= 0;
2732 unsigned long int *hashcodes
;
2733 unsigned long int *hashcodesp
;
2734 unsigned long int i
;
2736 /* Compute the hash values for all exported symbols. At the same
2737 time store the values in an array so that we could use them for
2739 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2740 * sizeof (unsigned long int));
2741 if (hashcodes
== NULL
)
2743 hashcodesp
= hashcodes
;
2745 /* Put all hash values in HASHCODES. */
2746 elf_link_hash_traverse (elf_hash_table (info
),
2747 elf_collect_hash_codes
, &hashcodesp
);
2749 /* We have a problem here. The following code to optimize the table
2750 size requires an integer type with more the 32 bits. If
2751 BFD_HOST_U_64_BIT is set we know about such a type. */
2752 #ifdef BFD_HOST_U_64_BIT
2753 if (info
->optimize
== true)
2755 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2758 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2759 unsigned long int *counts
;
2761 /* Possible optimization parameters: if we have NSYMS symbols we say
2762 that the hashing table must at least have NSYMS/4 and at most
2764 minsize
= nsyms
/ 4;
2767 best_size
= maxsize
= nsyms
* 2;
2769 /* Create array where we count the collisions in. We must use bfd_malloc
2770 since the size could be large. */
2771 counts
= (unsigned long int *) bfd_malloc (maxsize
2772 * sizeof (unsigned long int));
2779 /* Compute the "optimal" size for the hash table. The criteria is a
2780 minimal chain length. The minor criteria is (of course) the size
2782 for (i
= minsize
; i
< maxsize
; ++i
)
2784 /* Walk through the array of hashcodes and count the collisions. */
2785 BFD_HOST_U_64_BIT max
;
2786 unsigned long int j
;
2787 unsigned long int fact
;
2789 memset (counts
, '\0', i
* sizeof (unsigned long int));
2791 /* Determine how often each hash bucket is used. */
2792 for (j
= 0; j
< nsyms
; ++j
)
2793 ++counts
[hashcodes
[j
] % i
];
2795 /* For the weight function we need some information about the
2796 pagesize on the target. This is information need not be 100%
2797 accurate. Since this information is not available (so far) we
2798 define it here to a reasonable default value. If it is crucial
2799 to have a better value some day simply define this value. */
2800 # ifndef BFD_TARGET_PAGESIZE
2801 # define BFD_TARGET_PAGESIZE (4096)
2804 /* We in any case need 2 + NSYMS entries for the size values and
2806 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2809 /* Variant 1: optimize for short chains. We add the squares
2810 of all the chain lengths (which favous many small chain
2811 over a few long chains). */
2812 for (j
= 0; j
< i
; ++j
)
2813 max
+= counts
[j
] * counts
[j
];
2815 /* This adds penalties for the overall size of the table. */
2816 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2819 /* Variant 2: Optimize a lot more for small table. Here we
2820 also add squares of the size but we also add penalties for
2821 empty slots (the +1 term). */
2822 for (j
= 0; j
< i
; ++j
)
2823 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2825 /* The overall size of the table is considered, but not as
2826 strong as in variant 1, where it is squared. */
2827 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2831 /* Compare with current best results. */
2832 if (max
< best_chlen
)
2842 #endif /* defined (BFD_HOST_U_64_BIT) */
2844 /* This is the fallback solution if no 64bit type is available or if we
2845 are not supposed to spend much time on optimizations. We select the
2846 bucket count using a fixed set of numbers. */
2847 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2849 best_size
= elf_buckets
[i
];
2850 if (dynsymcount
< elf_buckets
[i
+ 1])
2855 /* Free the arrays we needed. */
2861 /* Set up the sizes and contents of the ELF dynamic sections. This is
2862 called by the ELF linker emulation before_allocation routine. We
2863 must set the sizes of the sections before the linker sets the
2864 addresses of the various sections. */
2867 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2868 export_dynamic
, filter_shlib
,
2869 auxiliary_filters
, info
, sinterpptr
,
2874 boolean export_dynamic
;
2875 const char *filter_shlib
;
2876 const char * const *auxiliary_filters
;
2877 struct bfd_link_info
*info
;
2878 asection
**sinterpptr
;
2879 struct bfd_elf_version_tree
*verdefs
;
2881 bfd_size_type soname_indx
;
2883 struct elf_backend_data
*bed
;
2884 struct elf_assign_sym_version_info asvinfo
;
2888 soname_indx
= (bfd_size_type
) -1;
2890 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2893 /* The backend may have to create some sections regardless of whether
2894 we're dynamic or not. */
2895 bed
= get_elf_backend_data (output_bfd
);
2896 if (bed
->elf_backend_always_size_sections
2897 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2900 dynobj
= elf_hash_table (info
)->dynobj
;
2902 /* If there were no dynamic objects in the link, there is nothing to
2907 if (elf_hash_table (info
)->dynamic_sections_created
)
2909 struct elf_info_failed eif
;
2910 struct elf_link_hash_entry
*h
;
2913 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2914 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2918 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2919 soname
, true, true);
2920 if (soname_indx
== (bfd_size_type
) -1
2921 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2927 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2929 info
->flags
|= DF_SYMBOLIC
;
2936 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2938 if (indx
== (bfd_size_type
) -1
2939 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
)
2941 && ! elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
)))
2945 if (filter_shlib
!= NULL
)
2949 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2950 filter_shlib
, true, true);
2951 if (indx
== (bfd_size_type
) -1
2952 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2956 if (auxiliary_filters
!= NULL
)
2958 const char * const *p
;
2960 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2964 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2966 if (indx
== (bfd_size_type
) -1
2967 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2975 /* If we are supposed to export all symbols into the dynamic symbol
2976 table (this is not the normal case), then do so. */
2979 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2985 /* Attach all the symbols to their version information. */
2986 asvinfo
.output_bfd
= output_bfd
;
2987 asvinfo
.info
= info
;
2988 asvinfo
.verdefs
= verdefs
;
2989 asvinfo
.export_dynamic
= export_dynamic
;
2990 asvinfo
.failed
= false;
2992 elf_link_hash_traverse (elf_hash_table (info
),
2993 elf_link_assign_sym_version
,
2998 /* Find all symbols which were defined in a dynamic object and make
2999 the backend pick a reasonable value for them. */
3000 elf_link_hash_traverse (elf_hash_table (info
),
3001 elf_adjust_dynamic_symbol
,
3006 /* Add some entries to the .dynamic section. We fill in some of the
3007 values later, in elf_bfd_final_link, but we must add the entries
3008 now so that we know the final size of the .dynamic section. */
3010 /* If there are initialization and/or finalization functions to
3011 call then add the corresponding DT_INIT/DT_FINI entries. */
3012 h
= (info
->init_function
3013 ? elf_link_hash_lookup (elf_hash_table (info
),
3014 info
->init_function
, false,
3018 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3019 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3021 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
3024 h
= (info
->fini_function
3025 ? elf_link_hash_lookup (elf_hash_table (info
),
3026 info
->fini_function
, false,
3030 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3031 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3033 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
3037 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
3038 /* If .dynstr is excluded from the link, we don't want any of
3039 these tags. Strictly, we should be checking each section
3040 individually; This quick check covers for the case where
3041 someone does a /DISCARD/ : { *(*) }. */
3042 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
3044 bfd_size_type strsize
;
3046 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3047 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
3048 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
3049 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
3050 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
3051 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
3052 sizeof (Elf_External_Sym
)))
3057 /* The backend must work out the sizes of all the other dynamic
3059 if (bed
->elf_backend_size_dynamic_sections
3060 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
3063 if (elf_hash_table (info
)->dynamic_sections_created
)
3067 size_t bucketcount
= 0;
3068 size_t hash_entry_size
;
3070 /* Set up the version definition section. */
3071 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3072 BFD_ASSERT (s
!= NULL
);
3074 /* We may have created additional version definitions if we are
3075 just linking a regular application. */
3076 verdefs
= asvinfo
.verdefs
;
3078 if (verdefs
== NULL
)
3079 _bfd_strip_section_from_output (info
, s
);
3084 struct bfd_elf_version_tree
*t
;
3086 Elf_Internal_Verdef def
;
3087 Elf_Internal_Verdaux defaux
;
3092 /* Make space for the base version. */
3093 size
+= sizeof (Elf_External_Verdef
);
3094 size
+= sizeof (Elf_External_Verdaux
);
3097 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3099 struct bfd_elf_version_deps
*n
;
3101 size
+= sizeof (Elf_External_Verdef
);
3102 size
+= sizeof (Elf_External_Verdaux
);
3105 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3106 size
+= sizeof (Elf_External_Verdaux
);
3109 s
->_raw_size
= size
;
3110 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3111 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3114 /* Fill in the version definition section. */
3118 def
.vd_version
= VER_DEF_CURRENT
;
3119 def
.vd_flags
= VER_FLG_BASE
;
3122 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3123 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3124 + sizeof (Elf_External_Verdaux
));
3126 if (soname_indx
!= (bfd_size_type
) -1)
3128 def
.vd_hash
= bfd_elf_hash (soname
);
3129 defaux
.vda_name
= soname_indx
;
3136 name
= output_bfd
->filename
;
3137 def
.vd_hash
= bfd_elf_hash (name
);
3138 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3140 if (indx
== (bfd_size_type
) -1)
3142 defaux
.vda_name
= indx
;
3144 defaux
.vda_next
= 0;
3146 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3147 (Elf_External_Verdef
*)p
);
3148 p
+= sizeof (Elf_External_Verdef
);
3149 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3150 (Elf_External_Verdaux
*) p
);
3151 p
+= sizeof (Elf_External_Verdaux
);
3153 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3156 struct bfd_elf_version_deps
*n
;
3157 struct elf_link_hash_entry
*h
;
3160 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3163 /* Add a symbol representing this version. */
3165 if (! (_bfd_generic_link_add_one_symbol
3166 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3167 (bfd_vma
) 0, (const char *) NULL
, false,
3168 get_elf_backend_data (dynobj
)->collect
,
3169 (struct bfd_link_hash_entry
**) &h
)))
3171 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3172 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3173 h
->type
= STT_OBJECT
;
3174 h
->verinfo
.vertree
= t
;
3176 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3179 def
.vd_version
= VER_DEF_CURRENT
;
3181 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3182 def
.vd_flags
|= VER_FLG_WEAK
;
3183 def
.vd_ndx
= t
->vernum
+ 1;
3184 def
.vd_cnt
= cdeps
+ 1;
3185 def
.vd_hash
= bfd_elf_hash (t
->name
);
3186 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3187 if (t
->next
!= NULL
)
3188 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3189 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3193 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3194 (Elf_External_Verdef
*) p
);
3195 p
+= sizeof (Elf_External_Verdef
);
3197 defaux
.vda_name
= h
->dynstr_index
;
3198 if (t
->deps
== NULL
)
3199 defaux
.vda_next
= 0;
3201 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3202 t
->name_indx
= defaux
.vda_name
;
3204 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3205 (Elf_External_Verdaux
*) p
);
3206 p
+= sizeof (Elf_External_Verdaux
);
3208 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3210 if (n
->version_needed
== NULL
)
3212 /* This can happen if there was an error in the
3214 defaux
.vda_name
= 0;
3217 defaux
.vda_name
= n
->version_needed
->name_indx
;
3218 if (n
->next
== NULL
)
3219 defaux
.vda_next
= 0;
3221 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3223 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3224 (Elf_External_Verdaux
*) p
);
3225 p
+= sizeof (Elf_External_Verdaux
);
3229 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
3230 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
3233 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3236 if (info
->new_dtags
&& info
->flags
)
3238 if (! elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
3245 info
->flags_1
&= ~ (DF_1_INITFIRST
3248 if (! elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
3252 /* Work out the size of the version reference section. */
3254 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3255 BFD_ASSERT (s
!= NULL
);
3257 struct elf_find_verdep_info sinfo
;
3259 sinfo
.output_bfd
= output_bfd
;
3261 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3262 if (sinfo
.vers
== 0)
3264 sinfo
.failed
= false;
3266 elf_link_hash_traverse (elf_hash_table (info
),
3267 elf_link_find_version_dependencies
,
3270 if (elf_tdata (output_bfd
)->verref
== NULL
)
3271 _bfd_strip_section_from_output (info
, s
);
3274 Elf_Internal_Verneed
*t
;
3279 /* Build the version definition section. */
3282 for (t
= elf_tdata (output_bfd
)->verref
;
3286 Elf_Internal_Vernaux
*a
;
3288 size
+= sizeof (Elf_External_Verneed
);
3290 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3291 size
+= sizeof (Elf_External_Vernaux
);
3294 s
->_raw_size
= size
;
3295 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
3296 if (s
->contents
== NULL
)
3300 for (t
= elf_tdata (output_bfd
)->verref
;
3305 Elf_Internal_Vernaux
*a
;
3309 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3312 t
->vn_version
= VER_NEED_CURRENT
;
3314 if (elf_dt_name (t
->vn_bfd
) != NULL
)
3315 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3316 elf_dt_name (t
->vn_bfd
),
3319 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3320 basename (t
->vn_bfd
->filename
),
3322 if (indx
== (bfd_size_type
) -1)
3325 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3326 if (t
->vn_nextref
== NULL
)
3329 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3330 + caux
* sizeof (Elf_External_Vernaux
));
3332 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3333 (Elf_External_Verneed
*) p
);
3334 p
+= sizeof (Elf_External_Verneed
);
3336 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3338 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3339 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3340 a
->vna_nodename
, true, false);
3341 if (indx
== (bfd_size_type
) -1)
3344 if (a
->vna_nextptr
== NULL
)
3347 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3349 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3350 (Elf_External_Vernaux
*) p
);
3351 p
+= sizeof (Elf_External_Vernaux
);
3355 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
3356 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
3359 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3363 /* Assign dynsym indicies. In a shared library we generate a
3364 section symbol for each output section, which come first.
3365 Next come all of the back-end allocated local dynamic syms,
3366 followed by the rest of the global symbols. */
3368 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3370 /* Work out the size of the symbol version section. */
3371 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3372 BFD_ASSERT (s
!= NULL
);
3373 if (dynsymcount
== 0
3374 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3376 _bfd_strip_section_from_output (info
, s
);
3377 /* The DYNSYMCOUNT might have changed if we were going to
3378 output a dynamic symbol table entry for S. */
3379 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3383 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3384 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3385 if (s
->contents
== NULL
)
3388 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
3392 /* Set the size of the .dynsym and .hash sections. We counted
3393 the number of dynamic symbols in elf_link_add_object_symbols.
3394 We will build the contents of .dynsym and .hash when we build
3395 the final symbol table, because until then we do not know the
3396 correct value to give the symbols. We built the .dynstr
3397 section as we went along in elf_link_add_object_symbols. */
3398 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3399 BFD_ASSERT (s
!= NULL
);
3400 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3401 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3402 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3405 if (dynsymcount
!= 0)
3407 Elf_Internal_Sym isym
;
3409 /* The first entry in .dynsym is a dummy symbol. */
3416 elf_swap_symbol_out (output_bfd
, &isym
,
3417 (PTR
) (Elf_External_Sym
*) s
->contents
);
3420 /* Compute the size of the hashing table. As a side effect this
3421 computes the hash values for all the names we export. */
3422 bucketcount
= compute_bucket_count (info
);
3424 s
= bfd_get_section_by_name (dynobj
, ".hash");
3425 BFD_ASSERT (s
!= NULL
);
3426 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3427 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3428 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3429 if (s
->contents
== NULL
)
3431 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3433 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
3434 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
3435 s
->contents
+ hash_entry_size
);
3437 elf_hash_table (info
)->bucketcount
= bucketcount
;
3439 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3440 BFD_ASSERT (s
!= NULL
);
3441 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3443 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3450 /* Fix up the flags for a symbol. This handles various cases which
3451 can only be fixed after all the input files are seen. This is
3452 currently called by both adjust_dynamic_symbol and
3453 assign_sym_version, which is unnecessary but perhaps more robust in
3454 the face of future changes. */
3457 elf_fix_symbol_flags (h
, eif
)
3458 struct elf_link_hash_entry
*h
;
3459 struct elf_info_failed
*eif
;
3461 /* If this symbol was mentioned in a non-ELF file, try to set
3462 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3463 permit a non-ELF file to correctly refer to a symbol defined in
3464 an ELF dynamic object. */
3465 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3467 while (h
->root
.type
== bfd_link_hash_indirect
)
3468 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3470 if (h
->root
.type
!= bfd_link_hash_defined
3471 && h
->root
.type
!= bfd_link_hash_defweak
)
3472 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3473 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3476 if (h
->root
.u
.def
.section
->owner
!= NULL
3477 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3478 == bfd_target_elf_flavour
))
3479 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3480 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3482 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3485 if (h
->dynindx
== -1
3486 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3487 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3489 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3498 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3499 was first seen in a non-ELF file. Fortunately, if the symbol
3500 was first seen in an ELF file, we're probably OK unless the
3501 symbol was defined in a non-ELF file. Catch that case here.
3502 FIXME: We're still in trouble if the symbol was first seen in
3503 a dynamic object, and then later in a non-ELF regular object. */
3504 if ((h
->root
.type
== bfd_link_hash_defined
3505 || h
->root
.type
== bfd_link_hash_defweak
)
3506 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3507 && (h
->root
.u
.def
.section
->owner
!= NULL
3508 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3509 != bfd_target_elf_flavour
)
3510 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3511 && (h
->elf_link_hash_flags
3512 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3513 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3516 /* If this is a final link, and the symbol was defined as a common
3517 symbol in a regular object file, and there was no definition in
3518 any dynamic object, then the linker will have allocated space for
3519 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3520 flag will not have been set. */
3521 if (h
->root
.type
== bfd_link_hash_defined
3522 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3523 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3524 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3525 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3526 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3528 /* If -Bsymbolic was used (which means to bind references to global
3529 symbols to the definition within the shared object), and this
3530 symbol was defined in a regular object, then it actually doesn't
3531 need a PLT entry, and we can accomplish that by forcing it local.
3532 Likewise, if the symbol has hidden or internal visibility.
3533 FIXME: It might be that we also do not need a PLT for other
3534 non-hidden visibilities, but we would have to tell that to the
3535 backend specifically; we can't just clear PLT-related data here. */
3536 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3537 && eif
->info
->shared
3538 && (eif
->info
->symbolic
3539 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3540 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
3541 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3543 struct elf_backend_data
*bed
;
3544 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3545 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3546 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
3547 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3548 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
);
3551 /* If this is a weak defined symbol in a dynamic object, and we know
3552 the real definition in the dynamic object, copy interesting flags
3553 over to the real definition. */
3554 if (h
->weakdef
!= NULL
)
3556 struct elf_link_hash_entry
*weakdef
;
3558 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3559 || h
->root
.type
== bfd_link_hash_defweak
);
3560 weakdef
= h
->weakdef
;
3561 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3562 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3563 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3565 /* If the real definition is defined by a regular object file,
3566 don't do anything special. See the longer description in
3567 elf_adjust_dynamic_symbol, below. */
3568 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3571 weakdef
->elf_link_hash_flags
|=
3572 (h
->elf_link_hash_flags
3573 & (ELF_LINK_HASH_REF_REGULAR
3574 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3575 | ELF_LINK_NON_GOT_REF
));
3581 /* Make the backend pick a good value for a dynamic symbol. This is
3582 called via elf_link_hash_traverse, and also calls itself
3586 elf_adjust_dynamic_symbol (h
, data
)
3587 struct elf_link_hash_entry
*h
;
3590 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3592 struct elf_backend_data
*bed
;
3594 /* Ignore indirect symbols. These are added by the versioning code. */
3595 if (h
->root
.type
== bfd_link_hash_indirect
)
3598 /* Fix the symbol flags. */
3599 if (! elf_fix_symbol_flags (h
, eif
))
3602 /* If this symbol does not require a PLT entry, and it is not
3603 defined by a dynamic object, or is not referenced by a regular
3604 object, ignore it. We do have to handle a weak defined symbol,
3605 even if no regular object refers to it, if we decided to add it
3606 to the dynamic symbol table. FIXME: Do we normally need to worry
3607 about symbols which are defined by one dynamic object and
3608 referenced by another one? */
3609 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3610 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3611 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3612 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3613 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3615 h
->plt
.offset
= (bfd_vma
) -1;
3619 /* If we've already adjusted this symbol, don't do it again. This
3620 can happen via a recursive call. */
3621 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3624 /* Don't look at this symbol again. Note that we must set this
3625 after checking the above conditions, because we may look at a
3626 symbol once, decide not to do anything, and then get called
3627 recursively later after REF_REGULAR is set below. */
3628 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3630 /* If this is a weak definition, and we know a real definition, and
3631 the real symbol is not itself defined by a regular object file,
3632 then get a good value for the real definition. We handle the
3633 real symbol first, for the convenience of the backend routine.
3635 Note that there is a confusing case here. If the real definition
3636 is defined by a regular object file, we don't get the real symbol
3637 from the dynamic object, but we do get the weak symbol. If the
3638 processor backend uses a COPY reloc, then if some routine in the
3639 dynamic object changes the real symbol, we will not see that
3640 change in the corresponding weak symbol. This is the way other
3641 ELF linkers work as well, and seems to be a result of the shared
3644 I will clarify this issue. Most SVR4 shared libraries define the
3645 variable _timezone and define timezone as a weak synonym. The
3646 tzset call changes _timezone. If you write
3647 extern int timezone;
3649 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3650 you might expect that, since timezone is a synonym for _timezone,
3651 the same number will print both times. However, if the processor
3652 backend uses a COPY reloc, then actually timezone will be copied
3653 into your process image, and, since you define _timezone
3654 yourself, _timezone will not. Thus timezone and _timezone will
3655 wind up at different memory locations. The tzset call will set
3656 _timezone, leaving timezone unchanged. */
3658 if (h
->weakdef
!= NULL
)
3660 /* If we get to this point, we know there is an implicit
3661 reference by a regular object file via the weak symbol H.
3662 FIXME: Is this really true? What if the traversal finds
3663 H->WEAKDEF before it finds H? */
3664 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3666 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
3670 /* If a symbol has no type and no size and does not require a PLT
3671 entry, then we are probably about to do the wrong thing here: we
3672 are probably going to create a COPY reloc for an empty object.
3673 This case can arise when a shared object is built with assembly
3674 code, and the assembly code fails to set the symbol type. */
3676 && h
->type
== STT_NOTYPE
3677 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3678 (*_bfd_error_handler
)
3679 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3680 h
->root
.root
.string
);
3682 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3683 bed
= get_elf_backend_data (dynobj
);
3684 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3693 /* This routine is used to export all defined symbols into the dynamic
3694 symbol table. It is called via elf_link_hash_traverse. */
3697 elf_export_symbol (h
, data
)
3698 struct elf_link_hash_entry
*h
;
3701 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3703 /* Ignore indirect symbols. These are added by the versioning code. */
3704 if (h
->root
.type
== bfd_link_hash_indirect
)
3707 if (h
->dynindx
== -1
3708 && (h
->elf_link_hash_flags
3709 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3711 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3721 /* Look through the symbols which are defined in other shared
3722 libraries and referenced here. Update the list of version
3723 dependencies. This will be put into the .gnu.version_r section.
3724 This function is called via elf_link_hash_traverse. */
3727 elf_link_find_version_dependencies (h
, data
)
3728 struct elf_link_hash_entry
*h
;
3731 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3732 Elf_Internal_Verneed
*t
;
3733 Elf_Internal_Vernaux
*a
;
3735 /* We only care about symbols defined in shared objects with version
3737 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3738 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3740 || h
->verinfo
.verdef
== NULL
)
3743 /* See if we already know about this version. */
3744 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3746 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3749 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3750 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3756 /* This is a new version. Add it to tree we are building. */
3760 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3763 rinfo
->failed
= true;
3767 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3768 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3769 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3772 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3774 /* Note that we are copying a string pointer here, and testing it
3775 above. If bfd_elf_string_from_elf_section is ever changed to
3776 discard the string data when low in memory, this will have to be
3778 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3780 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3781 a
->vna_nextptr
= t
->vn_auxptr
;
3783 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3786 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3793 /* Figure out appropriate versions for all the symbols. We may not
3794 have the version number script until we have read all of the input
3795 files, so until that point we don't know which symbols should be
3796 local. This function is called via elf_link_hash_traverse. */
3799 elf_link_assign_sym_version (h
, data
)
3800 struct elf_link_hash_entry
*h
;
3803 struct elf_assign_sym_version_info
*sinfo
=
3804 (struct elf_assign_sym_version_info
*) data
;
3805 struct bfd_link_info
*info
= sinfo
->info
;
3806 struct elf_backend_data
*bed
;
3807 struct elf_info_failed eif
;
3810 /* Fix the symbol flags. */
3813 if (! elf_fix_symbol_flags (h
, &eif
))
3816 sinfo
->failed
= true;
3820 /* We only need version numbers for symbols defined in regular
3822 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3825 bed
= get_elf_backend_data (sinfo
->output_bfd
);
3826 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3827 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3829 struct bfd_elf_version_tree
*t
;
3834 /* There are two consecutive ELF_VER_CHR characters if this is
3835 not a hidden symbol. */
3837 if (*p
== ELF_VER_CHR
)
3843 /* If there is no version string, we can just return out. */
3847 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3851 /* Look for the version. If we find it, it is no longer weak. */
3852 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3854 if (strcmp (t
->name
, p
) == 0)
3858 struct bfd_elf_version_expr
*d
;
3860 len
= p
- h
->root
.root
.string
;
3861 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3864 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3865 alc
[len
- 1] = '\0';
3866 if (alc
[len
- 2] == ELF_VER_CHR
)
3867 alc
[len
- 2] = '\0';
3869 h
->verinfo
.vertree
= t
;
3873 if (t
->globals
!= NULL
)
3875 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3876 if ((*d
->match
) (d
, alc
))
3880 /* See if there is anything to force this symbol to
3882 if (d
== NULL
&& t
->locals
!= NULL
)
3884 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3886 if ((*d
->match
) (d
, alc
))
3888 if (h
->dynindx
!= -1
3890 && ! sinfo
->export_dynamic
)
3892 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3893 (*bed
->elf_backend_hide_symbol
) (info
, h
);
3894 /* FIXME: The name of the symbol has
3895 already been recorded in the dynamic
3896 string table section. */
3904 bfd_release (sinfo
->output_bfd
, alc
);
3909 /* If we are building an application, we need to create a
3910 version node for this version. */
3911 if (t
== NULL
&& ! info
->shared
)
3913 struct bfd_elf_version_tree
**pp
;
3916 /* If we aren't going to export this symbol, we don't need
3917 to worry about it. */
3918 if (h
->dynindx
== -1)
3921 t
= ((struct bfd_elf_version_tree
*)
3922 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3925 sinfo
->failed
= true;
3934 t
->name_indx
= (unsigned int) -1;
3938 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3940 t
->vernum
= version_index
;
3944 h
->verinfo
.vertree
= t
;
3948 /* We could not find the version for a symbol when
3949 generating a shared archive. Return an error. */
3950 (*_bfd_error_handler
)
3951 (_("%s: undefined versioned symbol name %s"),
3952 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3953 bfd_set_error (bfd_error_bad_value
);
3954 sinfo
->failed
= true;
3959 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3962 /* If we don't have a version for this symbol, see if we can find
3964 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3966 struct bfd_elf_version_tree
*t
;
3967 struct bfd_elf_version_tree
*deflt
;
3968 struct bfd_elf_version_expr
*d
;
3970 /* See if can find what version this symbol is in. If the
3971 symbol is supposed to be local, then don't actually register
3974 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3976 if (t
->globals
!= NULL
)
3978 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3980 if ((*d
->match
) (d
, h
->root
.root
.string
))
3982 h
->verinfo
.vertree
= t
;
3991 if (t
->locals
!= NULL
)
3993 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3995 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3997 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3999 h
->verinfo
.vertree
= t
;
4000 if (h
->dynindx
!= -1
4002 && ! sinfo
->export_dynamic
)
4004 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
4005 (*bed
->elf_backend_hide_symbol
) (info
, h
);
4006 /* FIXME: The name of the symbol has already
4007 been recorded in the dynamic string table
4019 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4021 h
->verinfo
.vertree
= deflt
;
4022 if (h
->dynindx
!= -1
4024 && ! sinfo
->export_dynamic
)
4026 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
4027 (*bed
->elf_backend_hide_symbol
) (info
, h
);
4028 /* FIXME: The name of the symbol has already been
4029 recorded in the dynamic string table section. */
4037 /* Final phase of ELF linker. */
4039 /* A structure we use to avoid passing large numbers of arguments. */
4041 struct elf_final_link_info
4043 /* General link information. */
4044 struct bfd_link_info
*info
;
4047 /* Symbol string table. */
4048 struct bfd_strtab_hash
*symstrtab
;
4049 /* .dynsym section. */
4050 asection
*dynsym_sec
;
4051 /* .hash section. */
4053 /* symbol version section (.gnu.version). */
4054 asection
*symver_sec
;
4055 /* Buffer large enough to hold contents of any section. */
4057 /* Buffer large enough to hold external relocs of any section. */
4058 PTR external_relocs
;
4059 /* Buffer large enough to hold internal relocs of any section. */
4060 Elf_Internal_Rela
*internal_relocs
;
4061 /* Buffer large enough to hold external local symbols of any input
4063 Elf_External_Sym
*external_syms
;
4064 /* Buffer large enough to hold internal local symbols of any input
4066 Elf_Internal_Sym
*internal_syms
;
4067 /* Array large enough to hold a symbol index for each local symbol
4068 of any input BFD. */
4070 /* Array large enough to hold a section pointer for each local
4071 symbol of any input BFD. */
4072 asection
**sections
;
4073 /* Buffer to hold swapped out symbols. */
4074 Elf_External_Sym
*symbuf
;
4075 /* Number of swapped out symbols in buffer. */
4076 size_t symbuf_count
;
4077 /* Number of symbols which fit in symbuf. */
4081 static boolean elf_link_output_sym
4082 PARAMS ((struct elf_final_link_info
*, const char *,
4083 Elf_Internal_Sym
*, asection
*));
4084 static boolean elf_link_flush_output_syms
4085 PARAMS ((struct elf_final_link_info
*));
4086 static boolean elf_link_output_extsym
4087 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4088 static boolean elf_link_sec_merge_syms
4089 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4090 static boolean elf_link_input_bfd
4091 PARAMS ((struct elf_final_link_info
*, bfd
*));
4092 static boolean elf_reloc_link_order
4093 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
4094 struct bfd_link_order
*));
4096 /* This struct is used to pass information to elf_link_output_extsym. */
4098 struct elf_outext_info
4102 struct elf_final_link_info
*finfo
;
4105 /* Compute the size of, and allocate space for, REL_HDR which is the
4106 section header for a section containing relocations for O. */
4109 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
4111 Elf_Internal_Shdr
*rel_hdr
;
4114 register struct elf_link_hash_entry
**p
, **pend
;
4115 unsigned reloc_count
;
4117 /* Figure out how many relocations there will be. */
4118 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
4119 reloc_count
= elf_section_data (o
)->rel_count
;
4121 reloc_count
= elf_section_data (o
)->rel_count2
;
4123 /* That allows us to calculate the size of the section. */
4124 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
4126 /* The contents field must last into write_object_contents, so we
4127 allocate it with bfd_alloc rather than malloc. Also since we
4128 cannot be sure that the contents will actually be filled in,
4129 we zero the allocated space. */
4130 rel_hdr
->contents
= (PTR
) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
4131 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
4134 /* We only allocate one set of hash entries, so we only do it the
4135 first time we are called. */
4136 if (elf_section_data (o
)->rel_hashes
== NULL
)
4138 p
= ((struct elf_link_hash_entry
**)
4139 bfd_malloc (o
->reloc_count
4140 * sizeof (struct elf_link_hash_entry
*)));
4141 if (p
== NULL
&& o
->reloc_count
!= 0)
4144 elf_section_data (o
)->rel_hashes
= p
;
4145 pend
= p
+ o
->reloc_count
;
4146 for (; p
< pend
; p
++)
4153 /* When performing a relocateable link, the input relocations are
4154 preserved. But, if they reference global symbols, the indices
4155 referenced must be updated. Update all the relocations in
4156 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4159 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
4161 Elf_Internal_Shdr
*rel_hdr
;
4163 struct elf_link_hash_entry
**rel_hash
;
4166 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4168 for (i
= 0; i
< count
; i
++, rel_hash
++)
4170 if (*rel_hash
== NULL
)
4173 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4175 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4177 Elf_External_Rel
*erel
;
4178 Elf_Internal_Rel irel
;
4180 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4181 if (bed
->s
->swap_reloc_in
)
4182 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, &irel
);
4184 elf_swap_reloc_in (abfd
, erel
, &irel
);
4185 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4186 ELF_R_TYPE (irel
.r_info
));
4187 if (bed
->s
->swap_reloc_out
)
4188 (*bed
->s
->swap_reloc_out
) (abfd
, &irel
, (bfd_byte
*) erel
);
4190 elf_swap_reloc_out (abfd
, &irel
, erel
);
4194 Elf_External_Rela
*erela
;
4195 Elf_Internal_Rela irela
;
4197 BFD_ASSERT (rel_hdr
->sh_entsize
4198 == sizeof (Elf_External_Rela
));
4200 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4201 if (bed
->s
->swap_reloca_in
)
4202 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, &irela
);
4204 elf_swap_reloca_in (abfd
, erela
, &irela
);
4205 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4206 ELF_R_TYPE (irela
.r_info
));
4207 if (bed
->s
->swap_reloca_out
)
4208 (*bed
->s
->swap_reloca_out
) (abfd
, &irela
, (bfd_byte
*) erela
);
4210 elf_swap_reloca_out (abfd
, &irela
, erela
);
4215 /* Do the final step of an ELF link. */
4218 elf_bfd_final_link (abfd
, info
)
4220 struct bfd_link_info
*info
;
4224 struct elf_final_link_info finfo
;
4225 register asection
*o
;
4226 register struct bfd_link_order
*p
;
4228 size_t max_contents_size
;
4229 size_t max_external_reloc_size
;
4230 size_t max_internal_reloc_count
;
4231 size_t max_sym_count
;
4233 Elf_Internal_Sym elfsym
;
4235 Elf_Internal_Shdr
*symtab_hdr
;
4236 Elf_Internal_Shdr
*symstrtab_hdr
;
4237 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4238 struct elf_outext_info eoinfo
;
4242 abfd
->flags
|= DYNAMIC
;
4244 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4245 dynobj
= elf_hash_table (info
)->dynobj
;
4248 finfo
.output_bfd
= abfd
;
4249 finfo
.symstrtab
= elf_stringtab_init ();
4250 if (finfo
.symstrtab
== NULL
)
4255 finfo
.dynsym_sec
= NULL
;
4256 finfo
.hash_sec
= NULL
;
4257 finfo
.symver_sec
= NULL
;
4261 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4262 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4263 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4264 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4265 /* Note that it is OK if symver_sec is NULL. */
4268 finfo
.contents
= NULL
;
4269 finfo
.external_relocs
= NULL
;
4270 finfo
.internal_relocs
= NULL
;
4271 finfo
.external_syms
= NULL
;
4272 finfo
.internal_syms
= NULL
;
4273 finfo
.indices
= NULL
;
4274 finfo
.sections
= NULL
;
4275 finfo
.symbuf
= NULL
;
4276 finfo
.symbuf_count
= 0;
4278 /* Count up the number of relocations we will output for each output
4279 section, so that we know the sizes of the reloc sections. We
4280 also figure out some maximum sizes. */
4281 max_contents_size
= 0;
4282 max_external_reloc_size
= 0;
4283 max_internal_reloc_count
= 0;
4286 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4290 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4292 if (p
->type
== bfd_section_reloc_link_order
4293 || p
->type
== bfd_symbol_reloc_link_order
)
4295 else if (p
->type
== bfd_indirect_link_order
)
4299 sec
= p
->u
.indirect
.section
;
4301 /* Mark all sections which are to be included in the
4302 link. This will normally be every section. We need
4303 to do this so that we can identify any sections which
4304 the linker has decided to not include. */
4305 sec
->linker_mark
= true;
4307 if (sec
->flags
& SEC_MERGE
)
4310 if (info
->relocateable
|| info
->emitrelocations
)
4311 o
->reloc_count
+= sec
->reloc_count
;
4313 if (sec
->_raw_size
> max_contents_size
)
4314 max_contents_size
= sec
->_raw_size
;
4315 if (sec
->_cooked_size
> max_contents_size
)
4316 max_contents_size
= sec
->_cooked_size
;
4318 /* We are interested in just local symbols, not all
4320 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
4321 && (sec
->owner
->flags
& DYNAMIC
) == 0)
4325 if (elf_bad_symtab (sec
->owner
))
4326 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
4327 / sizeof (Elf_External_Sym
));
4329 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
4331 if (sym_count
> max_sym_count
)
4332 max_sym_count
= sym_count
;
4334 if ((sec
->flags
& SEC_RELOC
) != 0)
4338 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
4339 if (ext_size
> max_external_reloc_size
)
4340 max_external_reloc_size
= ext_size
;
4341 if (sec
->reloc_count
> max_internal_reloc_count
)
4342 max_internal_reloc_count
= sec
->reloc_count
;
4348 if (o
->reloc_count
> 0)
4349 o
->flags
|= SEC_RELOC
;
4352 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4353 set it (this is probably a bug) and if it is set
4354 assign_section_numbers will create a reloc section. */
4355 o
->flags
&=~ SEC_RELOC
;
4358 /* If the SEC_ALLOC flag is not set, force the section VMA to
4359 zero. This is done in elf_fake_sections as well, but forcing
4360 the VMA to 0 here will ensure that relocs against these
4361 sections are handled correctly. */
4362 if ((o
->flags
& SEC_ALLOC
) == 0
4363 && ! o
->user_set_vma
)
4367 if (! info
->relocateable
&& merged
)
4368 elf_link_hash_traverse (elf_hash_table (info
),
4369 elf_link_sec_merge_syms
, (PTR
) abfd
);
4371 /* Figure out the file positions for everything but the symbol table
4372 and the relocs. We set symcount to force assign_section_numbers
4373 to create a symbol table. */
4374 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
4375 BFD_ASSERT (! abfd
->output_has_begun
);
4376 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
4379 /* Figure out how many relocations we will have in each section.
4380 Just using RELOC_COUNT isn't good enough since that doesn't
4381 maintain a separate value for REL vs. RELA relocations. */
4382 if (info
->relocateable
|| info
->emitrelocations
)
4383 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4384 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4386 asection
*output_section
;
4388 if (! o
->linker_mark
)
4390 /* This section was omitted from the link. */
4394 output_section
= o
->output_section
;
4396 if (output_section
!= NULL
4397 && (o
->flags
& SEC_RELOC
) != 0)
4399 struct bfd_elf_section_data
*esdi
4400 = elf_section_data (o
);
4401 struct bfd_elf_section_data
*esdo
4402 = elf_section_data (output_section
);
4403 unsigned int *rel_count
;
4404 unsigned int *rel_count2
;
4406 /* We must be careful to add the relocation froms the
4407 input section to the right output count. */
4408 if (esdi
->rel_hdr
.sh_entsize
== esdo
->rel_hdr
.sh_entsize
)
4410 rel_count
= &esdo
->rel_count
;
4411 rel_count2
= &esdo
->rel_count2
;
4415 rel_count
= &esdo
->rel_count2
;
4416 rel_count2
= &esdo
->rel_count
;
4419 *rel_count
+= (esdi
->rel_hdr
.sh_size
4420 / esdi
->rel_hdr
.sh_entsize
);
4422 *rel_count2
+= (esdi
->rel_hdr2
->sh_size
4423 / esdi
->rel_hdr2
->sh_entsize
);
4427 /* That created the reloc sections. Set their sizes, and assign
4428 them file positions, and allocate some buffers. */
4429 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4431 if ((o
->flags
& SEC_RELOC
) != 0)
4433 if (!elf_link_size_reloc_section (abfd
,
4434 &elf_section_data (o
)->rel_hdr
,
4438 if (elf_section_data (o
)->rel_hdr2
4439 && !elf_link_size_reloc_section (abfd
,
4440 elf_section_data (o
)->rel_hdr2
,
4445 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4446 to count upwards while actually outputting the relocations. */
4447 elf_section_data (o
)->rel_count
= 0;
4448 elf_section_data (o
)->rel_count2
= 0;
4451 _bfd_elf_assign_file_positions_for_relocs (abfd
);
4453 /* We have now assigned file positions for all the sections except
4454 .symtab and .strtab. We start the .symtab section at the current
4455 file position, and write directly to it. We build the .strtab
4456 section in memory. */
4457 bfd_get_symcount (abfd
) = 0;
4458 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4459 /* sh_name is set in prep_headers. */
4460 symtab_hdr
->sh_type
= SHT_SYMTAB
;
4461 symtab_hdr
->sh_flags
= 0;
4462 symtab_hdr
->sh_addr
= 0;
4463 symtab_hdr
->sh_size
= 0;
4464 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
4465 /* sh_link is set in assign_section_numbers. */
4466 /* sh_info is set below. */
4467 /* sh_offset is set just below. */
4468 symtab_hdr
->sh_addralign
= bed
->s
->file_align
;
4470 off
= elf_tdata (abfd
)->next_file_pos
;
4471 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
4473 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4474 incorrect. We do not yet know the size of the .symtab section.
4475 We correct next_file_pos below, after we do know the size. */
4477 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4478 continuously seeking to the right position in the file. */
4479 if (! info
->keep_memory
|| max_sym_count
< 20)
4480 finfo
.symbuf_size
= 20;
4482 finfo
.symbuf_size
= max_sym_count
;
4483 finfo
.symbuf
= ((Elf_External_Sym
*)
4484 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
4485 if (finfo
.symbuf
== NULL
)
4488 /* Start writing out the symbol table. The first symbol is always a
4490 if (info
->strip
!= strip_all
|| info
->relocateable
|| info
->emitrelocations
)
4492 elfsym
.st_value
= 0;
4495 elfsym
.st_other
= 0;
4496 elfsym
.st_shndx
= SHN_UNDEF
;
4497 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4498 &elfsym
, bfd_und_section_ptr
))
4503 /* Some standard ELF linkers do this, but we don't because it causes
4504 bootstrap comparison failures. */
4505 /* Output a file symbol for the output file as the second symbol.
4506 We output this even if we are discarding local symbols, although
4507 I'm not sure if this is correct. */
4508 elfsym
.st_value
= 0;
4510 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
4511 elfsym
.st_other
= 0;
4512 elfsym
.st_shndx
= SHN_ABS
;
4513 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
4514 &elfsym
, bfd_abs_section_ptr
))
4518 /* Output a symbol for each section. We output these even if we are
4519 discarding local symbols, since they are used for relocs. These
4520 symbols have no names. We store the index of each one in the
4521 index field of the section, so that we can find it again when
4522 outputting relocs. */
4523 if (info
->strip
!= strip_all
|| info
->relocateable
|| info
->emitrelocations
)
4526 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4527 elfsym
.st_other
= 0;
4528 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4530 o
= section_from_elf_index (abfd
, i
);
4532 o
->target_index
= bfd_get_symcount (abfd
);
4533 elfsym
.st_shndx
= i
;
4534 if (info
->relocateable
|| o
== NULL
)
4535 elfsym
.st_value
= 0;
4537 elfsym
.st_value
= o
->vma
;
4538 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4544 /* Allocate some memory to hold information read in from the input
4546 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
4547 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
4548 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
4549 bfd_malloc (max_internal_reloc_count
4550 * sizeof (Elf_Internal_Rela
)
4551 * bed
->s
->int_rels_per_ext_rel
));
4552 finfo
.external_syms
= ((Elf_External_Sym
*)
4553 bfd_malloc (max_sym_count
4554 * sizeof (Elf_External_Sym
)));
4555 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
4556 bfd_malloc (max_sym_count
4557 * sizeof (Elf_Internal_Sym
)));
4558 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
4559 finfo
.sections
= ((asection
**)
4560 bfd_malloc (max_sym_count
* sizeof (asection
*)));
4561 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
4562 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
4563 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
4564 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
4565 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
4566 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
4567 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
4570 /* Since ELF permits relocations to be against local symbols, we
4571 must have the local symbols available when we do the relocations.
4572 Since we would rather only read the local symbols once, and we
4573 would rather not keep them in memory, we handle all the
4574 relocations for a single input file at the same time.
4576 Unfortunately, there is no way to know the total number of local
4577 symbols until we have seen all of them, and the local symbol
4578 indices precede the global symbol indices. This means that when
4579 we are generating relocateable output, and we see a reloc against
4580 a global symbol, we can not know the symbol index until we have
4581 finished examining all the local symbols to see which ones we are
4582 going to output. To deal with this, we keep the relocations in
4583 memory, and don't output them until the end of the link. This is
4584 an unfortunate waste of memory, but I don't see a good way around
4585 it. Fortunately, it only happens when performing a relocateable
4586 link, which is not the common case. FIXME: If keep_memory is set
4587 we could write the relocs out and then read them again; I don't
4588 know how bad the memory loss will be. */
4590 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4591 sub
->output_has_begun
= false;
4592 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4594 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4596 if (p
->type
== bfd_indirect_link_order
4597 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4598 == bfd_target_elf_flavour
))
4600 sub
= p
->u
.indirect
.section
->owner
;
4601 if (! sub
->output_has_begun
)
4603 if (! elf_link_input_bfd (&finfo
, sub
))
4605 sub
->output_has_begun
= true;
4608 else if (p
->type
== bfd_section_reloc_link_order
4609 || p
->type
== bfd_symbol_reloc_link_order
)
4611 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4616 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4622 /* That wrote out all the local symbols. Finish up the symbol table
4623 with the global symbols. Even if we want to strip everything we
4624 can, we still need to deal with those global symbols that got
4625 converted to local in a version script. */
4629 /* Output any global symbols that got converted to local in a
4630 version script. We do this in a separate step since ELF
4631 requires all local symbols to appear prior to any global
4632 symbols. FIXME: We should only do this if some global
4633 symbols were, in fact, converted to become local. FIXME:
4634 Will this work correctly with the Irix 5 linker? */
4635 eoinfo
.failed
= false;
4636 eoinfo
.finfo
= &finfo
;
4637 eoinfo
.localsyms
= true;
4638 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4644 /* The sh_info field records the index of the first non local symbol. */
4645 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4648 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
4650 Elf_Internal_Sym sym
;
4651 Elf_External_Sym
*dynsym
=
4652 (Elf_External_Sym
*)finfo
.dynsym_sec
->contents
;
4653 long last_local
= 0;
4655 /* Write out the section symbols for the output sections. */
4662 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4665 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4668 indx
= elf_section_data (s
)->this_idx
;
4669 BFD_ASSERT (indx
> 0);
4670 sym
.st_shndx
= indx
;
4671 sym
.st_value
= s
->vma
;
4673 elf_swap_symbol_out (abfd
, &sym
,
4674 dynsym
+ elf_section_data (s
)->dynindx
);
4677 last_local
= bfd_count_sections (abfd
);
4680 /* Write out the local dynsyms. */
4681 if (elf_hash_table (info
)->dynlocal
)
4683 struct elf_link_local_dynamic_entry
*e
;
4684 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
4688 sym
.st_size
= e
->isym
.st_size
;
4689 sym
.st_other
= e
->isym
.st_other
;
4691 /* Copy the internal symbol as is.
4692 Note that we saved a word of storage and overwrote
4693 the original st_name with the dynstr_index. */
4696 if (e
->isym
.st_shndx
> 0 && e
->isym
.st_shndx
< SHN_LORESERVE
)
4698 s
= bfd_section_from_elf_index (e
->input_bfd
,
4702 elf_section_data (s
->output_section
)->this_idx
;
4703 sym
.st_value
= (s
->output_section
->vma
4705 + e
->isym
.st_value
);
4708 if (last_local
< e
->dynindx
)
4709 last_local
= e
->dynindx
;
4711 elf_swap_symbol_out (abfd
, &sym
, dynsym
+ e
->dynindx
);
4715 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
4719 /* We get the global symbols from the hash table. */
4720 eoinfo
.failed
= false;
4721 eoinfo
.localsyms
= false;
4722 eoinfo
.finfo
= &finfo
;
4723 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4728 /* If backend needs to output some symbols not present in the hash
4729 table, do it now. */
4730 if (bed
->elf_backend_output_arch_syms
)
4732 if (! (*bed
->elf_backend_output_arch_syms
)
4733 (abfd
, info
, (PTR
) &finfo
,
4734 (boolean (*) PARAMS ((PTR
, const char *,
4735 Elf_Internal_Sym
*, asection
*)))
4736 elf_link_output_sym
))
4740 /* Flush all symbols to the file. */
4741 if (! elf_link_flush_output_syms (&finfo
))
4744 /* Now we know the size of the symtab section. */
4745 off
+= symtab_hdr
->sh_size
;
4747 /* Finish up and write out the symbol string table (.strtab)
4749 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4750 /* sh_name was set in prep_headers. */
4751 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4752 symstrtab_hdr
->sh_flags
= 0;
4753 symstrtab_hdr
->sh_addr
= 0;
4754 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4755 symstrtab_hdr
->sh_entsize
= 0;
4756 symstrtab_hdr
->sh_link
= 0;
4757 symstrtab_hdr
->sh_info
= 0;
4758 /* sh_offset is set just below. */
4759 symstrtab_hdr
->sh_addralign
= 1;
4761 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4762 elf_tdata (abfd
)->next_file_pos
= off
;
4764 if (bfd_get_symcount (abfd
) > 0)
4766 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4767 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4771 /* Adjust the relocs to have the correct symbol indices. */
4772 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4774 if ((o
->flags
& SEC_RELOC
) == 0)
4777 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
4778 elf_section_data (o
)->rel_count
,
4779 elf_section_data (o
)->rel_hashes
);
4780 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
4781 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
4782 elf_section_data (o
)->rel_count2
,
4783 (elf_section_data (o
)->rel_hashes
4784 + elf_section_data (o
)->rel_count
));
4786 /* Set the reloc_count field to 0 to prevent write_relocs from
4787 trying to swap the relocs out itself. */
4791 /* If we are linking against a dynamic object, or generating a
4792 shared library, finish up the dynamic linking information. */
4795 Elf_External_Dyn
*dyncon
, *dynconend
;
4797 /* Fix up .dynamic entries. */
4798 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4799 BFD_ASSERT (o
!= NULL
);
4801 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4802 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4803 for (; dyncon
< dynconend
; dyncon
++)
4805 Elf_Internal_Dyn dyn
;
4809 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4816 name
= info
->init_function
;
4819 name
= info
->fini_function
;
4822 struct elf_link_hash_entry
*h
;
4824 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4825 false, false, true);
4827 && (h
->root
.type
== bfd_link_hash_defined
4828 || h
->root
.type
== bfd_link_hash_defweak
))
4830 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4831 o
= h
->root
.u
.def
.section
;
4832 if (o
->output_section
!= NULL
)
4833 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4834 + o
->output_offset
);
4837 /* The symbol is imported from another shared
4838 library and does not apply to this one. */
4842 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4857 name
= ".gnu.version_d";
4860 name
= ".gnu.version_r";
4863 name
= ".gnu.version";
4865 o
= bfd_get_section_by_name (abfd
, name
);
4866 BFD_ASSERT (o
!= NULL
);
4867 dyn
.d_un
.d_ptr
= o
->vma
;
4868 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4875 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4880 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4882 Elf_Internal_Shdr
*hdr
;
4884 hdr
= elf_elfsections (abfd
)[i
];
4885 if (hdr
->sh_type
== type
4886 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4888 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4889 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4892 if (dyn
.d_un
.d_val
== 0
4893 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4894 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4898 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4904 /* If we have created any dynamic sections, then output them. */
4907 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4910 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4912 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4913 || o
->_raw_size
== 0
4914 || o
->output_section
== bfd_abs_section_ptr
)
4916 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4918 /* At this point, we are only interested in sections
4919 created by elf_link_create_dynamic_sections. */
4922 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4924 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4926 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4927 o
->contents
, o
->output_offset
,
4935 /* The contents of the .dynstr section are actually in a
4937 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4938 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4939 || ! _bfd_stringtab_emit (abfd
,
4940 elf_hash_table (info
)->dynstr
))
4946 /* If we have optimized stabs strings, output them. */
4947 if (elf_hash_table (info
)->stab_info
!= NULL
)
4949 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4953 if (finfo
.symstrtab
!= NULL
)
4954 _bfd_stringtab_free (finfo
.symstrtab
);
4955 if (finfo
.contents
!= NULL
)
4956 free (finfo
.contents
);
4957 if (finfo
.external_relocs
!= NULL
)
4958 free (finfo
.external_relocs
);
4959 if (finfo
.internal_relocs
!= NULL
)
4960 free (finfo
.internal_relocs
);
4961 if (finfo
.external_syms
!= NULL
)
4962 free (finfo
.external_syms
);
4963 if (finfo
.internal_syms
!= NULL
)
4964 free (finfo
.internal_syms
);
4965 if (finfo
.indices
!= NULL
)
4966 free (finfo
.indices
);
4967 if (finfo
.sections
!= NULL
)
4968 free (finfo
.sections
);
4969 if (finfo
.symbuf
!= NULL
)
4970 free (finfo
.symbuf
);
4971 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4973 if ((o
->flags
& SEC_RELOC
) != 0
4974 && elf_section_data (o
)->rel_hashes
!= NULL
)
4975 free (elf_section_data (o
)->rel_hashes
);
4978 elf_tdata (abfd
)->linker
= true;
4983 if (finfo
.symstrtab
!= NULL
)
4984 _bfd_stringtab_free (finfo
.symstrtab
);
4985 if (finfo
.contents
!= NULL
)
4986 free (finfo
.contents
);
4987 if (finfo
.external_relocs
!= NULL
)
4988 free (finfo
.external_relocs
);
4989 if (finfo
.internal_relocs
!= NULL
)
4990 free (finfo
.internal_relocs
);
4991 if (finfo
.external_syms
!= NULL
)
4992 free (finfo
.external_syms
);
4993 if (finfo
.internal_syms
!= NULL
)
4994 free (finfo
.internal_syms
);
4995 if (finfo
.indices
!= NULL
)
4996 free (finfo
.indices
);
4997 if (finfo
.sections
!= NULL
)
4998 free (finfo
.sections
);
4999 if (finfo
.symbuf
!= NULL
)
5000 free (finfo
.symbuf
);
5001 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5003 if ((o
->flags
& SEC_RELOC
) != 0
5004 && elf_section_data (o
)->rel_hashes
!= NULL
)
5005 free (elf_section_data (o
)->rel_hashes
);
5011 /* Add a symbol to the output symbol table. */
5014 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
5015 struct elf_final_link_info
*finfo
;
5017 Elf_Internal_Sym
*elfsym
;
5018 asection
*input_sec
;
5020 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
5021 struct bfd_link_info
*info
,
5026 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
5027 elf_backend_link_output_symbol_hook
;
5028 if (output_symbol_hook
!= NULL
)
5030 if (! ((*output_symbol_hook
)
5031 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
5035 if (name
== (const char *) NULL
|| *name
== '\0')
5036 elfsym
->st_name
= 0;
5037 else if (input_sec
->flags
& SEC_EXCLUDE
)
5038 elfsym
->st_name
= 0;
5041 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5044 if (elfsym
->st_name
== (unsigned long) -1)
5048 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5050 if (! elf_link_flush_output_syms (finfo
))
5054 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
5055 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
5056 ++finfo
->symbuf_count
;
5058 ++ bfd_get_symcount (finfo
->output_bfd
);
5063 /* Flush the output symbols to the file. */
5066 elf_link_flush_output_syms (finfo
)
5067 struct elf_final_link_info
*finfo
;
5069 if (finfo
->symbuf_count
> 0)
5071 Elf_Internal_Shdr
*symtab
;
5073 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5075 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
5077 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
5078 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
5079 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
5082 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
5084 finfo
->symbuf_count
= 0;
5090 /* Adjust all external symbols pointing into SEC_MERGE sections
5091 to reflect the object merging within the sections. */
5094 elf_link_sec_merge_syms (h
, data
)
5095 struct elf_link_hash_entry
*h
;
5100 if ((h
->root
.type
== bfd_link_hash_defined
5101 || h
->root
.type
== bfd_link_hash_defweak
)
5102 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
5103 && elf_section_data (sec
)->merge_info
)
5105 bfd
*output_bfd
= (bfd
*) data
;
5107 h
->root
.u
.def
.value
=
5108 _bfd_merged_section_offset (output_bfd
,
5109 &h
->root
.u
.def
.section
,
5110 elf_section_data (sec
)->merge_info
,
5111 h
->root
.u
.def
.value
, (bfd_vma
) 0);
5117 /* Add an external symbol to the symbol table. This is called from
5118 the hash table traversal routine. When generating a shared object,
5119 we go through the symbol table twice. The first time we output
5120 anything that might have been forced to local scope in a version
5121 script. The second time we output the symbols that are still
5125 elf_link_output_extsym (h
, data
)
5126 struct elf_link_hash_entry
*h
;
5129 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
5130 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
5132 Elf_Internal_Sym sym
;
5133 asection
*input_sec
;
5135 /* Decide whether to output this symbol in this pass. */
5136 if (eoinfo
->localsyms
)
5138 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5143 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5147 /* If we are not creating a shared library, and this symbol is
5148 referenced by a shared library but is not defined anywhere, then
5149 warn that it is undefined. If we do not do this, the runtime
5150 linker will complain that the symbol is undefined when the
5151 program is run. We don't have to worry about symbols that are
5152 referenced by regular files, because we will already have issued
5153 warnings for them. */
5154 if (! finfo
->info
->relocateable
5155 && ! finfo
->info
->allow_shlib_undefined
5156 && ! (finfo
->info
->shared
5157 && !finfo
->info
->no_undefined
)
5158 && h
->root
.type
== bfd_link_hash_undefined
5159 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
5160 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5162 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
5163 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
5164 (asection
*) NULL
, 0, true)))
5166 eoinfo
->failed
= true;
5171 /* We don't want to output symbols that have never been mentioned by
5172 a regular file, or that we have been told to strip. However, if
5173 h->indx is set to -2, the symbol is used by a reloc and we must
5177 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
5178 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
5179 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
5180 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5182 else if (finfo
->info
->strip
== strip_all
5183 || (finfo
->info
->strip
== strip_some
5184 && bfd_hash_lookup (finfo
->info
->keep_hash
,
5185 h
->root
.root
.string
,
5186 false, false) == NULL
))
5191 /* If we're stripping it, and it's not a dynamic symbol, there's
5192 nothing else to do unless it is a forced local symbol. */
5195 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5199 sym
.st_size
= h
->size
;
5200 sym
.st_other
= h
->other
;
5201 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5202 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
5203 else if (h
->root
.type
== bfd_link_hash_undefweak
5204 || h
->root
.type
== bfd_link_hash_defweak
)
5205 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
5207 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
5209 switch (h
->root
.type
)
5212 case bfd_link_hash_new
:
5216 case bfd_link_hash_undefined
:
5217 input_sec
= bfd_und_section_ptr
;
5218 sym
.st_shndx
= SHN_UNDEF
;
5221 case bfd_link_hash_undefweak
:
5222 input_sec
= bfd_und_section_ptr
;
5223 sym
.st_shndx
= SHN_UNDEF
;
5226 case bfd_link_hash_defined
:
5227 case bfd_link_hash_defweak
:
5229 input_sec
= h
->root
.u
.def
.section
;
5230 if (input_sec
->output_section
!= NULL
)
5233 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
5234 input_sec
->output_section
);
5235 if (sym
.st_shndx
== (unsigned short) -1)
5237 (*_bfd_error_handler
)
5238 (_("%s: could not find output section %s for input section %s"),
5239 bfd_get_filename (finfo
->output_bfd
),
5240 input_sec
->output_section
->name
,
5242 eoinfo
->failed
= true;
5246 /* ELF symbols in relocateable files are section relative,
5247 but in nonrelocateable files they are virtual
5249 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
5250 if (! finfo
->info
->relocateable
)
5251 sym
.st_value
+= input_sec
->output_section
->vma
;
5255 BFD_ASSERT (input_sec
->owner
== NULL
5256 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
5257 sym
.st_shndx
= SHN_UNDEF
;
5258 input_sec
= bfd_und_section_ptr
;
5263 case bfd_link_hash_common
:
5264 input_sec
= h
->root
.u
.c
.p
->section
;
5265 sym
.st_shndx
= SHN_COMMON
;
5266 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
5269 case bfd_link_hash_indirect
:
5270 /* These symbols are created by symbol versioning. They point
5271 to the decorated version of the name. For example, if the
5272 symbol foo@@GNU_1.2 is the default, which should be used when
5273 foo is used with no version, then we add an indirect symbol
5274 foo which points to foo@@GNU_1.2. We ignore these symbols,
5275 since the indirected symbol is already in the hash table. */
5278 case bfd_link_hash_warning
:
5279 /* We can't represent these symbols in ELF, although a warning
5280 symbol may have come from a .gnu.warning.SYMBOL section. We
5281 just put the target symbol in the hash table. If the target
5282 symbol does not really exist, don't do anything. */
5283 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
5285 return (elf_link_output_extsym
5286 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
5289 /* Give the processor backend a chance to tweak the symbol value,
5290 and also to finish up anything that needs to be done for this
5292 if ((h
->dynindx
!= -1
5293 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5294 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5296 struct elf_backend_data
*bed
;
5298 bed
= get_elf_backend_data (finfo
->output_bfd
);
5299 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
5300 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
5302 eoinfo
->failed
= true;
5307 /* If we are marking the symbol as undefined, and there are no
5308 non-weak references to this symbol from a regular object, then
5309 mark the symbol as weak undefined; if there are non-weak
5310 references, mark the symbol as strong. We can't do this earlier,
5311 because it might not be marked as undefined until the
5312 finish_dynamic_symbol routine gets through with it. */
5313 if (sym
.st_shndx
== SHN_UNDEF
5314 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
5315 && (ELF_ST_BIND(sym
.st_info
) == STB_GLOBAL
5316 || ELF_ST_BIND(sym
.st_info
) == STB_WEAK
))
5320 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
5321 bindtype
= STB_GLOBAL
;
5323 bindtype
= STB_WEAK
;
5324 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
5327 /* If a symbol is not defined locally, we clear the visibility
5329 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
5330 sym
.st_other
^= ELF_ST_VISIBILITY(sym
.st_other
);
5332 /* If this symbol should be put in the .dynsym section, then put it
5333 there now. We have already know the symbol index. We also fill
5334 in the entry in the .hash section. */
5335 if (h
->dynindx
!= -1
5336 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5340 size_t hash_entry_size
;
5341 bfd_byte
*bucketpos
;
5344 sym
.st_name
= h
->dynstr_index
;
5346 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
5347 (PTR
) (((Elf_External_Sym
*)
5348 finfo
->dynsym_sec
->contents
)
5351 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
5352 bucket
= h
->elf_hash_value
% bucketcount
;
5354 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
5355 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
5356 + (bucket
+ 2) * hash_entry_size
);
5357 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
5358 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
5359 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
5360 ((bfd_byte
*) finfo
->hash_sec
->contents
5361 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
5363 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
5365 Elf_Internal_Versym iversym
;
5367 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
5369 if (h
->verinfo
.verdef
== NULL
)
5370 iversym
.vs_vers
= 0;
5372 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
5376 if (h
->verinfo
.vertree
== NULL
)
5377 iversym
.vs_vers
= 1;
5379 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
5382 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
5383 iversym
.vs_vers
|= VERSYM_HIDDEN
;
5385 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
5386 (((Elf_External_Versym
*)
5387 finfo
->symver_sec
->contents
)
5392 /* If we're stripping it, then it was just a dynamic symbol, and
5393 there's nothing else to do. */
5397 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
5399 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
5401 eoinfo
->failed
= true;
5408 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5409 originated from the section given by INPUT_REL_HDR) to the
5413 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
5416 asection
*input_section
;
5417 Elf_Internal_Shdr
*input_rel_hdr
;
5418 Elf_Internal_Rela
*internal_relocs
;
5420 Elf_Internal_Rela
*irela
;
5421 Elf_Internal_Rela
*irelaend
;
5422 Elf_Internal_Shdr
*output_rel_hdr
;
5423 asection
*output_section
;
5424 unsigned int *rel_countp
= NULL
;
5425 struct elf_backend_data
*bed
;
5427 output_section
= input_section
->output_section
;
5428 output_rel_hdr
= NULL
;
5430 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
5431 == input_rel_hdr
->sh_entsize
)
5433 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5434 rel_countp
= &elf_section_data (output_section
)->rel_count
;
5436 else if (elf_section_data (output_section
)->rel_hdr2
5437 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
5438 == input_rel_hdr
->sh_entsize
))
5440 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
5441 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
5444 BFD_ASSERT (output_rel_hdr
!= NULL
);
5446 bed
= get_elf_backend_data (output_bfd
);
5447 irela
= internal_relocs
;
5448 irelaend
= irela
+ input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5449 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5451 Elf_External_Rel
*erel
;
5453 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
5454 for (; irela
< irelaend
; irela
++, erel
++)
5456 Elf_Internal_Rel irel
;
5458 irel
.r_offset
= irela
->r_offset
;
5459 irel
.r_info
= irela
->r_info
;
5460 BFD_ASSERT (irela
->r_addend
== 0);
5461 if (bed
->s
->swap_reloc_out
)
5462 (*bed
->s
->swap_reloc_out
) (output_bfd
, &irel
, (PTR
) erel
);
5464 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5469 Elf_External_Rela
*erela
;
5471 BFD_ASSERT (input_rel_hdr
->sh_entsize
5472 == sizeof (Elf_External_Rela
));
5473 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
5474 for (; irela
< irelaend
; irela
++, erela
++)
5475 if (bed
->s
->swap_reloca_out
)
5476 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (PTR
) erela
);
5478 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5481 /* Bump the counter, so that we know where to add the next set of
5483 *rel_countp
+= input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5486 /* Link an input file into the linker output file. This function
5487 handles all the sections and relocations of the input file at once.
5488 This is so that we only have to read the local symbols once, and
5489 don't have to keep them in memory. */
5492 elf_link_input_bfd (finfo
, input_bfd
)
5493 struct elf_final_link_info
*finfo
;
5496 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
5497 bfd
*, asection
*, bfd_byte
*,
5498 Elf_Internal_Rela
*,
5499 Elf_Internal_Sym
*, asection
**));
5501 Elf_Internal_Shdr
*symtab_hdr
;
5504 Elf_External_Sym
*external_syms
;
5505 Elf_External_Sym
*esym
;
5506 Elf_External_Sym
*esymend
;
5507 Elf_Internal_Sym
*isym
;
5509 asection
**ppsection
;
5511 struct elf_backend_data
*bed
;
5513 output_bfd
= finfo
->output_bfd
;
5514 bed
= get_elf_backend_data (output_bfd
);
5515 relocate_section
= bed
->elf_backend_relocate_section
;
5517 /* If this is a dynamic object, we don't want to do anything here:
5518 we don't want the local symbols, and we don't want the section
5520 if ((input_bfd
->flags
& DYNAMIC
) != 0)
5523 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5524 if (elf_bad_symtab (input_bfd
))
5526 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5531 locsymcount
= symtab_hdr
->sh_info
;
5532 extsymoff
= symtab_hdr
->sh_info
;
5535 /* Read the local symbols. */
5536 if (symtab_hdr
->contents
!= NULL
)
5537 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5538 else if (locsymcount
== 0)
5539 external_syms
= NULL
;
5542 external_syms
= finfo
->external_syms
;
5543 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5544 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
5545 locsymcount
, input_bfd
)
5546 != locsymcount
* sizeof (Elf_External_Sym
)))
5550 /* Swap in the local symbols and write out the ones which we know
5551 are going into the output file. */
5552 esym
= external_syms
;
5553 esymend
= esym
+ locsymcount
;
5554 isym
= finfo
->internal_syms
;
5555 pindex
= finfo
->indices
;
5556 ppsection
= finfo
->sections
;
5557 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
5561 Elf_Internal_Sym osym
;
5563 elf_swap_symbol_in (input_bfd
, esym
, isym
);
5566 if (elf_bad_symtab (input_bfd
))
5568 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
5576 if (isym
->st_shndx
== SHN_UNDEF
)
5578 isec
= bfd_und_section_ptr
;
5581 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
5583 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
5584 if (isec
&& elf_section_data (isec
)->merge_info
5585 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
5587 _bfd_merged_section_offset (output_bfd
, &isec
,
5588 elf_section_data (isec
)->merge_info
,
5589 isym
->st_value
, (bfd_vma
) 0);
5591 else if (isym
->st_shndx
== SHN_ABS
)
5593 isec
= bfd_abs_section_ptr
;
5596 else if (isym
->st_shndx
== SHN_COMMON
)
5598 isec
= bfd_com_section_ptr
;
5609 /* Don't output the first, undefined, symbol. */
5610 if (esym
== external_syms
)
5613 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5617 /* Save away all section symbol values. */
5622 if (isec
->symbol
->value
!= isym
->st_value
)
5623 (*_bfd_error_handler
)
5624 (_("%s: invalid section symbol index 0x%x (%s) ingored"),
5625 bfd_get_filename (input_bfd
), isym
->st_shndx
,
5629 isec
->symbol
->value
= isym
->st_value
;
5632 /* If this is a discarded link-once section symbol, update
5633 it's value to that of the kept section symbol. The
5634 linker will keep the first of any matching link-once
5635 sections, so we should have already seen it's section
5636 symbol. I trust no-one will have the bright idea of
5637 re-ordering the bfd list... */
5639 && (bfd_get_section_flags (input_bfd
, isec
) & SEC_LINK_ONCE
) != 0
5640 && (ksec
= isec
->kept_section
) != NULL
)
5642 isym
->st_value
= ksec
->symbol
->value
;
5644 /* That put the value right, but the section info is all
5645 wrong. I hope this works. */
5646 isec
->output_offset
= ksec
->output_offset
;
5647 isec
->output_section
= ksec
->output_section
;
5650 /* We never output section symbols. Instead, we use the
5651 section symbol of the corresponding section in the output
5656 /* If we are stripping all symbols, we don't want to output this
5658 if (finfo
->info
->strip
== strip_all
)
5661 /* If we are discarding all local symbols, we don't want to
5662 output this one. If we are generating a relocateable output
5663 file, then some of the local symbols may be required by
5664 relocs; we output them below as we discover that they are
5666 if (finfo
->info
->discard
== discard_all
)
5669 /* If this symbol is defined in a section which we are
5670 discarding, we don't need to keep it, but note that
5671 linker_mark is only reliable for sections that have contents.
5672 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5673 as well as linker_mark. */
5674 if (isym
->st_shndx
> 0
5675 && isym
->st_shndx
< SHN_LORESERVE
5677 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
5678 || (! finfo
->info
->relocateable
5679 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
5682 /* Get the name of the symbol. */
5683 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
5688 /* See if we are discarding symbols with this name. */
5689 if ((finfo
->info
->strip
== strip_some
5690 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
5692 || (((finfo
->info
->discard
== discard_sec_merge
5693 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocateable
)
5694 || finfo
->info
->discard
== discard_l
)
5695 && bfd_is_local_label_name (input_bfd
, name
)))
5698 /* If we get here, we are going to output this symbol. */
5702 /* Adjust the section index for the output file. */
5703 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
5704 isec
->output_section
);
5705 if (osym
.st_shndx
== (unsigned short) -1)
5708 *pindex
= bfd_get_symcount (output_bfd
);
5710 /* ELF symbols in relocateable files are section relative, but
5711 in executable files they are virtual addresses. Note that
5712 this code assumes that all ELF sections have an associated
5713 BFD section with a reasonable value for output_offset; below
5714 we assume that they also have a reasonable value for
5715 output_section. Any special sections must be set up to meet
5716 these requirements. */
5717 osym
.st_value
+= isec
->output_offset
;
5718 if (! finfo
->info
->relocateable
)
5719 osym
.st_value
+= isec
->output_section
->vma
;
5721 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
5725 /* Relocate the contents of each section. */
5726 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
5730 if (! o
->linker_mark
)
5732 /* This section was omitted from the link. */
5736 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5737 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
5740 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
5742 /* Section was created by elf_link_create_dynamic_sections
5747 /* Get the contents of the section. They have been cached by a
5748 relaxation routine. Note that o is a section in an input
5749 file, so the contents field will not have been set by any of
5750 the routines which work on output files. */
5751 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
5752 contents
= elf_section_data (o
)->this_hdr
.contents
;
5755 contents
= finfo
->contents
;
5756 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
5757 (file_ptr
) 0, o
->_raw_size
))
5761 if ((o
->flags
& SEC_RELOC
) != 0)
5763 Elf_Internal_Rela
*internal_relocs
;
5765 /* Get the swapped relocs. */
5766 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5767 (input_bfd
, o
, finfo
->external_relocs
,
5768 finfo
->internal_relocs
, false));
5769 if (internal_relocs
== NULL
5770 && o
->reloc_count
> 0)
5773 /* Relocate the section by invoking a back end routine.
5775 The back end routine is responsible for adjusting the
5776 section contents as necessary, and (if using Rela relocs
5777 and generating a relocateable output file) adjusting the
5778 reloc addend as necessary.
5780 The back end routine does not have to worry about setting
5781 the reloc address or the reloc symbol index.
5783 The back end routine is given a pointer to the swapped in
5784 internal symbols, and can access the hash table entries
5785 for the external symbols via elf_sym_hashes (input_bfd).
5787 When generating relocateable output, the back end routine
5788 must handle STB_LOCAL/STT_SECTION symbols specially. The
5789 output symbol is going to be a section symbol
5790 corresponding to the output section, which will require
5791 the addend to be adjusted. */
5793 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
5794 input_bfd
, o
, contents
,
5796 finfo
->internal_syms
,
5800 if (finfo
->info
->relocateable
|| finfo
->info
->emitrelocations
)
5802 Elf_Internal_Rela
*irela
;
5803 Elf_Internal_Rela
*irelaend
;
5804 struct elf_link_hash_entry
**rel_hash
;
5805 Elf_Internal_Shdr
*input_rel_hdr
;
5807 /* Adjust the reloc addresses and symbol indices. */
5809 irela
= internal_relocs
;
5811 irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5812 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
5813 + elf_section_data (o
->output_section
)->rel_count
5814 + elf_section_data (o
->output_section
)->rel_count2
);
5815 for (; irela
< irelaend
; irela
++, rel_hash
++)
5817 unsigned long r_symndx
;
5818 Elf_Internal_Sym
*isym
;
5821 irela
->r_offset
+= o
->output_offset
;
5823 /* Relocs in an executable have to be virtual addresses. */
5824 if (finfo
->info
->emitrelocations
)
5825 irela
->r_offset
+= o
->output_section
->vma
;
5827 r_symndx
= ELF_R_SYM (irela
->r_info
);
5832 if (r_symndx
>= locsymcount
5833 || (elf_bad_symtab (input_bfd
)
5834 && finfo
->sections
[r_symndx
] == NULL
))
5836 struct elf_link_hash_entry
*rh
;
5839 /* This is a reloc against a global symbol. We
5840 have not yet output all the local symbols, so
5841 we do not know the symbol index of any global
5842 symbol. We set the rel_hash entry for this
5843 reloc to point to the global hash table entry
5844 for this symbol. The symbol index is then
5845 set at the end of elf_bfd_final_link. */
5846 indx
= r_symndx
- extsymoff
;
5847 rh
= elf_sym_hashes (input_bfd
)[indx
];
5848 while (rh
->root
.type
== bfd_link_hash_indirect
5849 || rh
->root
.type
== bfd_link_hash_warning
)
5850 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5852 /* Setting the index to -2 tells
5853 elf_link_output_extsym that this symbol is
5855 BFD_ASSERT (rh
->indx
< 0);
5863 /* This is a reloc against a local symbol. */
5866 isym
= finfo
->internal_syms
+ r_symndx
;
5867 sec
= finfo
->sections
[r_symndx
];
5868 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5870 /* I suppose the backend ought to fill in the
5871 section of any STT_SECTION symbol against a
5872 processor specific section. If we have
5873 discarded a section, the output_section will
5874 be the absolute section. */
5876 && (bfd_is_abs_section (sec
)
5877 || (sec
->output_section
!= NULL
5878 && bfd_is_abs_section (sec
->output_section
))))
5880 else if (sec
== NULL
|| sec
->owner
== NULL
)
5882 bfd_set_error (bfd_error_bad_value
);
5887 r_symndx
= sec
->output_section
->target_index
;
5888 BFD_ASSERT (r_symndx
!= 0);
5893 if (finfo
->indices
[r_symndx
] == -1)
5899 if (finfo
->info
->strip
== strip_all
)
5901 /* You can't do ld -r -s. */
5902 bfd_set_error (bfd_error_invalid_operation
);
5906 /* This symbol was skipped earlier, but
5907 since it is needed by a reloc, we
5908 must output it now. */
5909 link
= symtab_hdr
->sh_link
;
5910 name
= bfd_elf_string_from_elf_section (input_bfd
,
5916 osec
= sec
->output_section
;
5918 _bfd_elf_section_from_bfd_section (output_bfd
,
5920 if (isym
->st_shndx
== (unsigned short) -1)
5923 isym
->st_value
+= sec
->output_offset
;
5924 if (! finfo
->info
->relocateable
)
5925 isym
->st_value
+= osec
->vma
;
5927 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5929 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5933 r_symndx
= finfo
->indices
[r_symndx
];
5936 irela
->r_info
= ELF_R_INFO (r_symndx
,
5937 ELF_R_TYPE (irela
->r_info
));
5940 /* Swap out the relocs. */
5941 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5942 elf_link_output_relocs (output_bfd
, o
,
5946 += input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5947 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
5949 elf_link_output_relocs (output_bfd
, o
,
5955 /* Write out the modified section contents. */
5956 if (elf_section_data (o
)->stab_info
)
5958 if (! (_bfd_write_section_stabs
5959 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5960 o
, &elf_section_data (o
)->stab_info
, contents
)))
5963 else if (elf_section_data (o
)->merge_info
)
5965 if (! (_bfd_write_merged_section
5966 (output_bfd
, o
, elf_section_data (o
)->merge_info
)))
5971 if (! (o
->flags
& SEC_EXCLUDE
) &&
5972 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5973 contents
, o
->output_offset
,
5974 (o
->_cooked_size
!= 0
5984 /* Generate a reloc when linking an ELF file. This is a reloc
5985 requested by the linker, and does come from any input file. This
5986 is used to build constructor and destructor tables when linking
5990 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5992 struct bfd_link_info
*info
;
5993 asection
*output_section
;
5994 struct bfd_link_order
*link_order
;
5996 reloc_howto_type
*howto
;
6000 struct elf_link_hash_entry
**rel_hash_ptr
;
6001 Elf_Internal_Shdr
*rel_hdr
;
6002 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
6004 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
6007 bfd_set_error (bfd_error_bad_value
);
6011 addend
= link_order
->u
.reloc
.p
->addend
;
6013 /* Figure out the symbol index. */
6014 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
6015 + elf_section_data (output_section
)->rel_count
6016 + elf_section_data (output_section
)->rel_count2
);
6017 if (link_order
->type
== bfd_section_reloc_link_order
)
6019 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
6020 BFD_ASSERT (indx
!= 0);
6021 *rel_hash_ptr
= NULL
;
6025 struct elf_link_hash_entry
*h
;
6027 /* Treat a reloc against a defined symbol as though it were
6028 actually against the section. */
6029 h
= ((struct elf_link_hash_entry
*)
6030 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
6031 link_order
->u
.reloc
.p
->u
.name
,
6032 false, false, true));
6034 && (h
->root
.type
== bfd_link_hash_defined
6035 || h
->root
.type
== bfd_link_hash_defweak
))
6039 section
= h
->root
.u
.def
.section
;
6040 indx
= section
->output_section
->target_index
;
6041 *rel_hash_ptr
= NULL
;
6042 /* It seems that we ought to add the symbol value to the
6043 addend here, but in practice it has already been added
6044 because it was passed to constructor_callback. */
6045 addend
+= section
->output_section
->vma
+ section
->output_offset
;
6049 /* Setting the index to -2 tells elf_link_output_extsym that
6050 this symbol is used by a reloc. */
6057 if (! ((*info
->callbacks
->unattached_reloc
)
6058 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
6059 (asection
*) NULL
, (bfd_vma
) 0)))
6065 /* If this is an inplace reloc, we must write the addend into the
6067 if (howto
->partial_inplace
&& addend
!= 0)
6070 bfd_reloc_status_type rstat
;
6074 size
= bfd_get_reloc_size (howto
);
6075 buf
= (bfd_byte
*) bfd_zmalloc (size
);
6076 if (buf
== (bfd_byte
*) NULL
)
6078 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
6084 case bfd_reloc_outofrange
:
6086 case bfd_reloc_overflow
:
6087 if (! ((*info
->callbacks
->reloc_overflow
)
6089 (link_order
->type
== bfd_section_reloc_link_order
6090 ? bfd_section_name (output_bfd
,
6091 link_order
->u
.reloc
.p
->u
.section
)
6092 : link_order
->u
.reloc
.p
->u
.name
),
6093 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
6101 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
6102 (file_ptr
) link_order
->offset
, size
);
6108 /* The address of a reloc is relative to the section in a
6109 relocateable file, and is a virtual address in an executable
6111 offset
= link_order
->offset
;
6112 if (! info
->relocateable
)
6113 offset
+= output_section
->vma
;
6115 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
6117 if (rel_hdr
->sh_type
== SHT_REL
)
6119 Elf_Internal_Rel irel
;
6120 Elf_External_Rel
*erel
;
6122 irel
.r_offset
= offset
;
6123 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
6124 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
6125 + elf_section_data (output_section
)->rel_count
);
6126 if (bed
->s
->swap_reloc_out
)
6127 (*bed
->s
->swap_reloc_out
) (output_bfd
, &irel
, (bfd_byte
*) erel
);
6129 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
6133 Elf_Internal_Rela irela
;
6134 Elf_External_Rela
*erela
;
6136 irela
.r_offset
= offset
;
6137 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
6138 irela
.r_addend
= addend
;
6139 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
6140 + elf_section_data (output_section
)->rel_count
);
6141 if (bed
->s
->swap_reloca_out
)
6142 (*bed
->s
->swap_reloca_out
) (output_bfd
, &irela
, (bfd_byte
*) erela
);
6144 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
6147 ++elf_section_data (output_section
)->rel_count
;
6152 /* Allocate a pointer to live in a linker created section. */
6155 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
6157 struct bfd_link_info
*info
;
6158 elf_linker_section_t
*lsect
;
6159 struct elf_link_hash_entry
*h
;
6160 const Elf_Internal_Rela
*rel
;
6162 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
6163 elf_linker_section_pointers_t
*linker_section_ptr
;
6164 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
6166 BFD_ASSERT (lsect
!= NULL
);
6168 /* Is this a global symbol? */
6171 /* Has this symbol already been allocated, if so, our work is done */
6172 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
6177 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
6178 /* Make sure this symbol is output as a dynamic symbol. */
6179 if (h
->dynindx
== -1)
6181 if (! elf_link_record_dynamic_symbol (info
, h
))
6185 if (lsect
->rel_section
)
6186 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
6189 else /* Allocation of a pointer to a local symbol */
6191 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
6193 /* Allocate a table to hold the local symbols if first time */
6196 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6197 register unsigned int i
;
6199 ptr
= (elf_linker_section_pointers_t
**)
6200 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
6205 elf_local_ptr_offsets (abfd
) = ptr
;
6206 for (i
= 0; i
< num_symbols
; i
++)
6207 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
6210 /* Has this symbol already been allocated, if so, our work is done */
6211 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
6216 ptr_linker_section_ptr
= &ptr
[r_symndx
];
6220 /* If we are generating a shared object, we need to
6221 output a R_<xxx>_RELATIVE reloc so that the
6222 dynamic linker can adjust this GOT entry. */
6223 BFD_ASSERT (lsect
->rel_section
!= NULL
);
6224 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
6228 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
6229 from internal memory. */
6230 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
6231 linker_section_ptr
= (elf_linker_section_pointers_t
*)
6232 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
6234 if (!linker_section_ptr
)
6237 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
6238 linker_section_ptr
->addend
= rel
->r_addend
;
6239 linker_section_ptr
->which
= lsect
->which
;
6240 linker_section_ptr
->written_address_p
= false;
6241 *ptr_linker_section_ptr
= linker_section_ptr
;
6244 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
6246 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
6247 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
6248 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
6249 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
6251 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
6253 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
6254 lsect
->sym_hash
->root
.root
.string
,
6255 (long)ARCH_SIZE
/ 8,
6256 (long)lsect
->sym_hash
->root
.u
.def
.value
);
6262 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
6264 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
6267 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
6268 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
6275 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
6278 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
6281 /* Fill in the address for a pointer generated in alinker section. */
6284 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
6287 struct bfd_link_info
*info
;
6288 elf_linker_section_t
*lsect
;
6289 struct elf_link_hash_entry
*h
;
6291 const Elf_Internal_Rela
*rel
;
6294 elf_linker_section_pointers_t
*linker_section_ptr
;
6296 BFD_ASSERT (lsect
!= NULL
);
6298 if (h
!= NULL
) /* global symbol */
6300 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
6304 BFD_ASSERT (linker_section_ptr
!= NULL
);
6306 if (! elf_hash_table (info
)->dynamic_sections_created
6309 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
6311 /* This is actually a static link, or it is a
6312 -Bsymbolic link and the symbol is defined
6313 locally. We must initialize this entry in the
6316 When doing a dynamic link, we create a .rela.<xxx>
6317 relocation entry to initialize the value. This
6318 is done in the finish_dynamic_symbol routine. */
6319 if (!linker_section_ptr
->written_address_p
)
6321 linker_section_ptr
->written_address_p
= true;
6322 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
6323 lsect
->section
->contents
+ linker_section_ptr
->offset
);
6327 else /* local symbol */
6329 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
6330 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
6331 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
6332 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
6336 BFD_ASSERT (linker_section_ptr
!= NULL
);
6338 /* Write out pointer if it hasn't been rewritten out before */
6339 if (!linker_section_ptr
->written_address_p
)
6341 linker_section_ptr
->written_address_p
= true;
6342 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
6343 lsect
->section
->contents
+ linker_section_ptr
->offset
);
6347 asection
*srel
= lsect
->rel_section
;
6348 Elf_Internal_Rela outrel
;
6350 /* We need to generate a relative reloc for the dynamic linker. */
6352 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
6355 BFD_ASSERT (srel
!= NULL
);
6357 outrel
.r_offset
= (lsect
->section
->output_section
->vma
6358 + lsect
->section
->output_offset
6359 + linker_section_ptr
->offset
);
6360 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
6361 outrel
.r_addend
= 0;
6362 elf_swap_reloca_out (output_bfd
, &outrel
,
6363 (((Elf_External_Rela
*)
6364 lsect
->section
->contents
)
6365 + elf_section_data (lsect
->section
)->rel_count
));
6366 ++elf_section_data (lsect
->section
)->rel_count
;
6371 relocation
= (lsect
->section
->output_offset
6372 + linker_section_ptr
->offset
6373 - lsect
->hole_offset
6374 - lsect
->sym_offset
);
6377 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
6378 lsect
->name
, (long)relocation
, (long)relocation
);
6381 /* Subtract out the addend, because it will get added back in by the normal
6383 return relocation
- linker_section_ptr
->addend
;
6386 /* Garbage collect unused sections. */
6388 static boolean elf_gc_mark
6389 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
6390 asection
* (*gc_mark_hook
)
6391 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6392 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
6394 static boolean elf_gc_sweep
6395 PARAMS ((struct bfd_link_info
*info
,
6396 boolean (*gc_sweep_hook
)
6397 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6398 const Elf_Internal_Rela
*relocs
))));
6400 static boolean elf_gc_sweep_symbol
6401 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
6403 static boolean elf_gc_allocate_got_offsets
6404 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
6406 static boolean elf_gc_propagate_vtable_entries_used
6407 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6409 static boolean elf_gc_smash_unused_vtentry_relocs
6410 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6412 /* The mark phase of garbage collection. For a given section, mark
6413 it, and all the sections which define symbols to which it refers. */
6416 elf_gc_mark (info
, sec
, gc_mark_hook
)
6417 struct bfd_link_info
*info
;
6419 asection
* (*gc_mark_hook
)
6420 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6421 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
6427 /* Look through the section relocs. */
6429 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
6431 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
6432 Elf_Internal_Shdr
*symtab_hdr
;
6433 struct elf_link_hash_entry
**sym_hashes
;
6436 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
6437 bfd
*input_bfd
= sec
->owner
;
6438 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
6440 /* GCFIXME: how to arrange so that relocs and symbols are not
6441 reread continually? */
6443 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6444 sym_hashes
= elf_sym_hashes (input_bfd
);
6446 /* Read the local symbols. */
6447 if (elf_bad_symtab (input_bfd
))
6449 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6453 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
6454 if (symtab_hdr
->contents
)
6455 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
6456 else if (nlocsyms
== 0)
6460 locsyms
= freesyms
=
6461 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
6462 if (freesyms
== NULL
6463 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
6464 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
6465 nlocsyms
, input_bfd
)
6466 != nlocsyms
* sizeof (Elf_External_Sym
)))
6473 /* Read the relocations. */
6474 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6475 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
6476 info
->keep_memory
));
6477 if (relstart
== NULL
)
6482 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6484 for (rel
= relstart
; rel
< relend
; rel
++)
6486 unsigned long r_symndx
;
6488 struct elf_link_hash_entry
*h
;
6491 r_symndx
= ELF_R_SYM (rel
->r_info
);
6495 if (elf_bad_symtab (sec
->owner
))
6497 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6498 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
6499 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, NULL
, &s
);
6502 h
= sym_hashes
[r_symndx
- extsymoff
];
6503 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, h
, NULL
);
6506 else if (r_symndx
>= nlocsyms
)
6508 h
= sym_hashes
[r_symndx
- extsymoff
];
6509 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, h
, NULL
);
6513 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6514 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, NULL
, &s
);
6517 if (rsec
&& !rsec
->gc_mark
)
6518 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
6526 if (!info
->keep_memory
)
6536 /* The sweep phase of garbage collection. Remove all garbage sections. */
6539 elf_gc_sweep (info
, gc_sweep_hook
)
6540 struct bfd_link_info
*info
;
6541 boolean (*gc_sweep_hook
)
6542 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6543 const Elf_Internal_Rela
*relocs
));
6547 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6551 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6554 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6556 /* Keep special sections. Keep .debug sections. */
6557 if ((o
->flags
& SEC_LINKER_CREATED
)
6558 || (o
->flags
& SEC_DEBUGGING
))
6564 /* Skip sweeping sections already excluded. */
6565 if (o
->flags
& SEC_EXCLUDE
)
6568 /* Since this is early in the link process, it is simple
6569 to remove a section from the output. */
6570 o
->flags
|= SEC_EXCLUDE
;
6572 /* But we also have to update some of the relocation
6573 info we collected before. */
6575 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
6577 Elf_Internal_Rela
*internal_relocs
;
6580 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6581 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
6582 if (internal_relocs
== NULL
)
6585 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
6587 if (!info
->keep_memory
)
6588 free (internal_relocs
);
6596 /* Remove the symbols that were in the swept sections from the dynamic
6597 symbol table. GCFIXME: Anyone know how to get them out of the
6598 static symbol table as well? */
6602 elf_link_hash_traverse (elf_hash_table (info
),
6603 elf_gc_sweep_symbol
,
6606 elf_hash_table (info
)->dynsymcount
= i
;
6612 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6615 elf_gc_sweep_symbol (h
, idxptr
)
6616 struct elf_link_hash_entry
*h
;
6619 int *idx
= (int *) idxptr
;
6621 if (h
->dynindx
!= -1
6622 && ((h
->root
.type
!= bfd_link_hash_defined
6623 && h
->root
.type
!= bfd_link_hash_defweak
)
6624 || h
->root
.u
.def
.section
->gc_mark
))
6625 h
->dynindx
= (*idx
)++;
6630 /* Propogate collected vtable information. This is called through
6631 elf_link_hash_traverse. */
6634 elf_gc_propagate_vtable_entries_used (h
, okp
)
6635 struct elf_link_hash_entry
*h
;
6638 /* Those that are not vtables. */
6639 if (h
->vtable_parent
== NULL
)
6642 /* Those vtables that do not have parents, we cannot merge. */
6643 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
6646 /* If we've already been done, exit. */
6647 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
6650 /* Make sure the parent's table is up to date. */
6651 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
6653 if (h
->vtable_entries_used
== NULL
)
6655 /* None of this table's entries were referenced. Re-use the
6657 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
6658 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
6665 /* Or the parent's entries into ours. */
6666 cu
= h
->vtable_entries_used
;
6668 pu
= h
->vtable_parent
->vtable_entries_used
;
6671 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
6674 if (*pu
) *cu
= true;
6684 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
6685 struct elf_link_hash_entry
*h
;
6689 bfd_vma hstart
, hend
;
6690 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
6691 struct elf_backend_data
*bed
;
6693 /* Take care of both those symbols that do not describe vtables as
6694 well as those that are not loaded. */
6695 if (h
->vtable_parent
== NULL
)
6698 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
6699 || h
->root
.type
== bfd_link_hash_defweak
);
6701 sec
= h
->root
.u
.def
.section
;
6702 hstart
= h
->root
.u
.def
.value
;
6703 hend
= hstart
+ h
->size
;
6705 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6706 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
6708 return *(boolean
*)okp
= false;
6709 bed
= get_elf_backend_data (sec
->owner
);
6710 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6712 for (rel
= relstart
; rel
< relend
; ++rel
)
6713 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
6715 /* If the entry is in use, do nothing. */
6716 if (h
->vtable_entries_used
6717 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
6719 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
6720 if (h
->vtable_entries_used
[entry
])
6723 /* Otherwise, kill it. */
6724 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
6730 /* Do mark and sweep of unused sections. */
6733 elf_gc_sections (abfd
, info
)
6735 struct bfd_link_info
*info
;
6739 asection
* (*gc_mark_hook
)
6740 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
6741 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
6743 if (!get_elf_backend_data (abfd
)->can_gc_sections
6744 || info
->relocateable
|| info
->emitrelocations
6745 || elf_hash_table (info
)->dynamic_sections_created
)
6748 /* Apply transitive closure to the vtable entry usage info. */
6749 elf_link_hash_traverse (elf_hash_table (info
),
6750 elf_gc_propagate_vtable_entries_used
,
6755 /* Kill the vtable relocations that were not used. */
6756 elf_link_hash_traverse (elf_hash_table (info
),
6757 elf_gc_smash_unused_vtentry_relocs
,
6762 /* Grovel through relocs to find out who stays ... */
6764 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
6765 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6769 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6772 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6774 if (o
->flags
& SEC_KEEP
)
6775 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
6780 /* ... and mark SEC_EXCLUDE for those that go. */
6781 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
6787 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6790 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
6793 struct elf_link_hash_entry
*h
;
6796 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
6797 struct elf_link_hash_entry
**search
, *child
;
6798 bfd_size_type extsymcount
;
6800 /* The sh_info field of the symtab header tells us where the
6801 external symbols start. We don't care about the local symbols at
6803 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
6804 if (!elf_bad_symtab (abfd
))
6805 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6807 sym_hashes
= elf_sym_hashes (abfd
);
6808 sym_hashes_end
= sym_hashes
+ extsymcount
;
6810 /* Hunt down the child symbol, which is in this section at the same
6811 offset as the relocation. */
6812 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
6814 if ((child
= *search
) != NULL
6815 && (child
->root
.type
== bfd_link_hash_defined
6816 || child
->root
.type
== bfd_link_hash_defweak
)
6817 && child
->root
.u
.def
.section
== sec
6818 && child
->root
.u
.def
.value
== offset
)
6822 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
6823 bfd_get_filename (abfd
), sec
->name
,
6824 (unsigned long)offset
);
6825 bfd_set_error (bfd_error_invalid_operation
);
6831 /* This *should* only be the absolute section. It could potentially
6832 be that someone has defined a non-global vtable though, which
6833 would be bad. It isn't worth paging in the local symbols to be
6834 sure though; that case should simply be handled by the assembler. */
6836 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6839 child
->vtable_parent
= h
;
6844 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6847 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6848 bfd
*abfd ATTRIBUTE_UNUSED
;
6849 asection
*sec ATTRIBUTE_UNUSED
;
6850 struct elf_link_hash_entry
*h
;
6853 if (addend
>= h
->vtable_entries_size
)
6856 boolean
*ptr
= h
->vtable_entries_used
;
6858 /* While the symbol is undefined, we have to be prepared to handle
6860 if (h
->root
.type
== bfd_link_hash_undefined
)
6867 /* Oops! We've got a reference past the defined end of
6868 the table. This is probably a bug -- shall we warn? */
6873 /* Allocate one extra entry for use as a "done" flag for the
6874 consolidation pass. */
6875 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof (boolean
);
6879 ptr
= bfd_realloc (ptr
- 1, bytes
);
6885 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof (boolean
);
6886 memset (((char *)ptr
) + oldbytes
, 0, bytes
- oldbytes
);
6890 ptr
= bfd_zmalloc (bytes
);
6895 /* And arrange for that done flag to be at index -1. */
6896 h
->vtable_entries_used
= ptr
+ 1;
6897 h
->vtable_entries_size
= size
;
6900 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6905 /* And an accompanying bit to work out final got entry offsets once
6906 we're done. Should be called from final_link. */
6909 elf_gc_common_finalize_got_offsets (abfd
, info
)
6911 struct bfd_link_info
*info
;
6914 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6917 /* The GOT offset is relative to the .got section, but the GOT header is
6918 put into the .got.plt section, if the backend uses it. */
6919 if (bed
->want_got_plt
)
6922 gotoff
= bed
->got_header_size
;
6924 /* Do the local .got entries first. */
6925 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6927 bfd_signed_vma
*local_got
;
6928 bfd_size_type j
, locsymcount
;
6929 Elf_Internal_Shdr
*symtab_hdr
;
6931 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
6934 local_got
= elf_local_got_refcounts (i
);
6938 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6939 if (elf_bad_symtab (i
))
6940 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6942 locsymcount
= symtab_hdr
->sh_info
;
6944 for (j
= 0; j
< locsymcount
; ++j
)
6946 if (local_got
[j
] > 0)
6948 local_got
[j
] = gotoff
;
6949 gotoff
+= ARCH_SIZE
/ 8;
6952 local_got
[j
] = (bfd_vma
) -1;
6956 /* Then the global .got entries. .plt refcounts are handled by
6957 adjust_dynamic_symbol */
6958 elf_link_hash_traverse (elf_hash_table (info
),
6959 elf_gc_allocate_got_offsets
,
6964 /* We need a special top-level link routine to convert got reference counts
6965 to real got offsets. */
6968 elf_gc_allocate_got_offsets (h
, offarg
)
6969 struct elf_link_hash_entry
*h
;
6972 bfd_vma
*off
= (bfd_vma
*) offarg
;
6974 if (h
->got
.refcount
> 0)
6976 h
->got
.offset
= off
[0];
6977 off
[0] += ARCH_SIZE
/ 8;
6980 h
->got
.offset
= (bfd_vma
) -1;
6985 /* Many folk need no more in the way of final link than this, once
6986 got entry reference counting is enabled. */
6989 elf_gc_common_final_link (abfd
, info
)
6991 struct bfd_link_info
*info
;
6993 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6996 /* Invoke the regular ELF backend linker to do all the work. */
6997 return elf_bfd_final_link (abfd
, info
);
7000 /* This function will be called though elf_link_hash_traverse to store
7001 all hash value of the exported symbols in an array. */
7004 elf_collect_hash_codes (h
, data
)
7005 struct elf_link_hash_entry
*h
;
7008 unsigned long **valuep
= (unsigned long **) data
;
7014 /* Ignore indirect symbols. These are added by the versioning code. */
7015 if (h
->dynindx
== -1)
7018 name
= h
->root
.root
.string
;
7019 p
= strchr (name
, ELF_VER_CHR
);
7022 alc
= bfd_malloc (p
- name
+ 1);
7023 memcpy (alc
, name
, p
- name
);
7024 alc
[p
- name
] = '\0';
7028 /* Compute the hash value. */
7029 ha
= bfd_elf_hash (name
);
7031 /* Store the found hash value in the array given as the argument. */
7034 /* And store it in the struct so that we can put it in the hash table
7036 h
->elf_hash_value
= ha
;