2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* ELF linker code. */
23 /* This struct is used to pass information to routines called via
24 elf_link_hash_traverse which must return failure. */
26 struct elf_info_failed
29 struct bfd_link_info
*info
;
30 struct bfd_elf_version_tree
*verdefs
;
33 static boolean is_global_data_symbol_definition
34 PARAMS ((bfd
*, Elf_Internal_Sym
*));
35 static boolean elf_link_is_defined_archive_symbol
36 PARAMS ((bfd
*, carsym
*));
37 static boolean elf_link_add_object_symbols
38 PARAMS ((bfd
*, struct bfd_link_info
*));
39 static boolean elf_link_add_archive_symbols
40 PARAMS ((bfd
*, struct bfd_link_info
*));
41 static boolean elf_merge_symbol
42 PARAMS ((bfd
*, struct bfd_link_info
*, const char *,
43 Elf_Internal_Sym
*, asection
**, bfd_vma
*,
44 struct elf_link_hash_entry
**, boolean
*, boolean
*,
46 static boolean elf_add_default_symbol
47 PARAMS ((bfd
*, struct bfd_link_info
*, struct elf_link_hash_entry
*,
48 const char *, Elf_Internal_Sym
*, asection
**, bfd_vma
*,
49 boolean
*, boolean
, boolean
));
50 static boolean elf_export_symbol
51 PARAMS ((struct elf_link_hash_entry
*, PTR
));
52 static boolean elf_finalize_dynstr
53 PARAMS ((bfd
*, struct bfd_link_info
*));
54 static boolean elf_fix_symbol_flags
55 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
56 static boolean elf_adjust_dynamic_symbol
57 PARAMS ((struct elf_link_hash_entry
*, PTR
));
58 static boolean elf_link_find_version_dependencies
59 PARAMS ((struct elf_link_hash_entry
*, PTR
));
60 static boolean elf_link_find_version_dependencies
61 PARAMS ((struct elf_link_hash_entry
*, PTR
));
62 static boolean elf_link_assign_sym_version
63 PARAMS ((struct elf_link_hash_entry
*, PTR
));
64 static boolean elf_collect_hash_codes
65 PARAMS ((struct elf_link_hash_entry
*, PTR
));
66 static boolean elf_link_read_relocs_from_section
67 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
68 static size_t compute_bucket_count
69 PARAMS ((struct bfd_link_info
*));
70 static void elf_link_output_relocs
71 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
72 static boolean elf_link_size_reloc_section
73 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
74 static void elf_link_adjust_relocs
75 PARAMS ((bfd
*, Elf_Internal_Shdr
*, unsigned int,
76 struct elf_link_hash_entry
**));
77 static int elf_link_sort_cmp1
78 PARAMS ((const void *, const void *));
79 static int elf_link_sort_cmp2
80 PARAMS ((const void *, const void *));
81 static size_t elf_link_sort_relocs
82 PARAMS ((bfd
*, struct bfd_link_info
*, asection
**));
83 static boolean elf_section_ignore_discarded_relocs
84 PARAMS ((asection
*));
86 /* Given an ELF BFD, add symbols to the global hash table as
90 elf_bfd_link_add_symbols (abfd
, info
)
92 struct bfd_link_info
*info
;
94 switch (bfd_get_format (abfd
))
97 return elf_link_add_object_symbols (abfd
, info
);
99 return elf_link_add_archive_symbols (abfd
, info
);
101 bfd_set_error (bfd_error_wrong_format
);
106 /* Return true iff this is a non-common, definition of a non-function symbol. */
108 is_global_data_symbol_definition (abfd
, sym
)
109 bfd
* abfd ATTRIBUTE_UNUSED
;
110 Elf_Internal_Sym
* sym
;
112 /* Local symbols do not count, but target specific ones might. */
113 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
114 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
117 /* Function symbols do not count. */
118 if (ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)
121 /* If the section is undefined, then so is the symbol. */
122 if (sym
->st_shndx
== SHN_UNDEF
)
125 /* If the symbol is defined in the common section, then
126 it is a common definition and so does not count. */
127 if (sym
->st_shndx
== SHN_COMMON
)
130 /* If the symbol is in a target specific section then we
131 must rely upon the backend to tell us what it is. */
132 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
133 /* FIXME - this function is not coded yet:
135 return _bfd_is_global_symbol_definition (abfd, sym);
137 Instead for now assume that the definition is not global,
138 Even if this is wrong, at least the linker will behave
139 in the same way that it used to do. */
145 /* Search the symbol table of the archive element of the archive ABFD
146 whose archive map contains a mention of SYMDEF, and determine if
147 the symbol is defined in this element. */
149 elf_link_is_defined_archive_symbol (abfd
, symdef
)
153 Elf_Internal_Shdr
* hdr
;
154 Elf_Internal_Shdr
* shndx_hdr
;
155 Elf_External_Sym
* esym
;
156 Elf_External_Sym
* esymend
;
157 Elf_External_Sym
* buf
= NULL
;
158 Elf_External_Sym_Shndx
* shndx_buf
= NULL
;
159 Elf_External_Sym_Shndx
* shndx
;
160 bfd_size_type symcount
;
161 bfd_size_type extsymcount
;
162 bfd_size_type extsymoff
;
163 boolean result
= false;
167 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
168 if (abfd
== (bfd
*) NULL
)
171 if (! bfd_check_format (abfd
, bfd_object
))
174 /* If we have already included the element containing this symbol in the
175 link then we do not need to include it again. Just claim that any symbol
176 it contains is not a definition, so that our caller will not decide to
177 (re)include this element. */
178 if (abfd
->archive_pass
)
181 /* Select the appropriate symbol table. */
182 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
184 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
185 shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
189 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
193 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
195 /* The sh_info field of the symtab header tells us where the
196 external symbols start. We don't care about the local symbols. */
197 if (elf_bad_symtab (abfd
))
199 extsymcount
= symcount
;
204 extsymcount
= symcount
- hdr
->sh_info
;
205 extsymoff
= hdr
->sh_info
;
208 amt
= extsymcount
* sizeof (Elf_External_Sym
);
209 buf
= (Elf_External_Sym
*) bfd_malloc (amt
);
210 if (buf
== NULL
&& extsymcount
!= 0)
213 /* Read in the symbol table.
214 FIXME: This ought to be cached somewhere. */
215 pos
= hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
);
216 if (bfd_seek (abfd
, pos
, SEEK_SET
) != 0
217 || bfd_bread ((PTR
) buf
, amt
, abfd
) != amt
)
220 if (shndx_hdr
!= NULL
&& shndx_hdr
->sh_size
!= 0)
222 amt
= extsymcount
* sizeof (Elf_External_Sym_Shndx
);
223 shndx_buf
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
224 if (shndx_buf
== NULL
&& extsymcount
!= 0)
227 pos
= shndx_hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym_Shndx
);
228 if (bfd_seek (abfd
, pos
, SEEK_SET
) != 0
229 || bfd_bread ((PTR
) shndx_buf
, amt
, abfd
) != amt
)
233 /* Scan the symbol table looking for SYMDEF. */
234 esymend
= buf
+ extsymcount
;
235 for (esym
= buf
, shndx
= shndx_buf
;
237 esym
++, shndx
= (shndx
!= NULL
? shndx
+ 1 : NULL
))
239 Elf_Internal_Sym sym
;
242 elf_swap_symbol_in (abfd
, esym
, shndx
, &sym
);
244 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
245 if (name
== (const char *) NULL
)
248 if (strcmp (name
, symdef
->name
) == 0)
250 result
= is_global_data_symbol_definition (abfd
, & sym
);
256 if (shndx_buf
!= NULL
)
264 /* Add symbols from an ELF archive file to the linker hash table. We
265 don't use _bfd_generic_link_add_archive_symbols because of a
266 problem which arises on UnixWare. The UnixWare libc.so is an
267 archive which includes an entry libc.so.1 which defines a bunch of
268 symbols. The libc.so archive also includes a number of other
269 object files, which also define symbols, some of which are the same
270 as those defined in libc.so.1. Correct linking requires that we
271 consider each object file in turn, and include it if it defines any
272 symbols we need. _bfd_generic_link_add_archive_symbols does not do
273 this; it looks through the list of undefined symbols, and includes
274 any object file which defines them. When this algorithm is used on
275 UnixWare, it winds up pulling in libc.so.1 early and defining a
276 bunch of symbols. This means that some of the other objects in the
277 archive are not included in the link, which is incorrect since they
278 precede libc.so.1 in the archive.
280 Fortunately, ELF archive handling is simpler than that done by
281 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
282 oddities. In ELF, if we find a symbol in the archive map, and the
283 symbol is currently undefined, we know that we must pull in that
286 Unfortunately, we do have to make multiple passes over the symbol
287 table until nothing further is resolved. */
290 elf_link_add_archive_symbols (abfd
, info
)
292 struct bfd_link_info
*info
;
295 boolean
*defined
= NULL
;
296 boolean
*included
= NULL
;
301 if (! bfd_has_map (abfd
))
303 /* An empty archive is a special case. */
304 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
306 bfd_set_error (bfd_error_no_armap
);
310 /* Keep track of all symbols we know to be already defined, and all
311 files we know to be already included. This is to speed up the
312 second and subsequent passes. */
313 c
= bfd_ardata (abfd
)->symdef_count
;
317 amt
*= sizeof (boolean
);
318 defined
= (boolean
*) bfd_malloc (amt
);
319 included
= (boolean
*) bfd_malloc (amt
);
320 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
322 memset (defined
, 0, (size_t) amt
);
323 memset (included
, 0, (size_t) amt
);
325 symdefs
= bfd_ardata (abfd
)->symdefs
;
338 symdefend
= symdef
+ c
;
339 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
341 struct elf_link_hash_entry
*h
;
343 struct bfd_link_hash_entry
*undefs_tail
;
346 if (defined
[i
] || included
[i
])
348 if (symdef
->file_offset
== last
)
354 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
355 false, false, false);
361 /* If this is a default version (the name contains @@),
362 look up the symbol again without the version. The
363 effect is that references to the symbol without the
364 version will be matched by the default symbol in the
367 p
= strchr (symdef
->name
, ELF_VER_CHR
);
368 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
371 copy
= bfd_alloc (abfd
, (bfd_size_type
) (p
- symdef
->name
+ 1));
374 memcpy (copy
, symdef
->name
, (size_t) (p
- symdef
->name
));
375 copy
[p
- symdef
->name
] = '\0';
377 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
378 false, false, false);
380 bfd_release (abfd
, copy
);
386 if (h
->root
.type
== bfd_link_hash_common
)
388 /* We currently have a common symbol. The archive map contains
389 a reference to this symbol, so we may want to include it. We
390 only want to include it however, if this archive element
391 contains a definition of the symbol, not just another common
394 Unfortunately some archivers (including GNU ar) will put
395 declarations of common symbols into their archive maps, as
396 well as real definitions, so we cannot just go by the archive
397 map alone. Instead we must read in the element's symbol
398 table and check that to see what kind of symbol definition
400 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
403 else if (h
->root
.type
!= bfd_link_hash_undefined
)
405 if (h
->root
.type
!= bfd_link_hash_undefweak
)
410 /* We need to include this archive member. */
411 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
412 if (element
== (bfd
*) NULL
)
415 if (! bfd_check_format (element
, bfd_object
))
418 /* Doublecheck that we have not included this object
419 already--it should be impossible, but there may be
420 something wrong with the archive. */
421 if (element
->archive_pass
!= 0)
423 bfd_set_error (bfd_error_bad_value
);
426 element
->archive_pass
= 1;
428 undefs_tail
= info
->hash
->undefs_tail
;
430 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
433 if (! elf_link_add_object_symbols (element
, info
))
436 /* If there are any new undefined symbols, we need to make
437 another pass through the archive in order to see whether
438 they can be defined. FIXME: This isn't perfect, because
439 common symbols wind up on undefs_tail and because an
440 undefined symbol which is defined later on in this pass
441 does not require another pass. This isn't a bug, but it
442 does make the code less efficient than it could be. */
443 if (undefs_tail
!= info
->hash
->undefs_tail
)
446 /* Look backward to mark all symbols from this object file
447 which we have already seen in this pass. */
451 included
[mark
] = true;
456 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
458 /* We mark subsequent symbols from this object file as we go
459 on through the loop. */
460 last
= symdef
->file_offset
;
471 if (defined
!= (boolean
*) NULL
)
473 if (included
!= (boolean
*) NULL
)
478 /* This function is called when we want to define a new symbol. It
479 handles the various cases which arise when we find a definition in
480 a dynamic object, or when there is already a definition in a
481 dynamic object. The new symbol is described by NAME, SYM, PSEC,
482 and PVALUE. We set SYM_HASH to the hash table entry. We set
483 OVERRIDE if the old symbol is overriding a new definition. We set
484 TYPE_CHANGE_OK if it is OK for the type to change. We set
485 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
486 change, we mean that we shouldn't warn if the type or size does
487 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
491 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
492 override
, type_change_ok
, size_change_ok
, dt_needed
)
494 struct bfd_link_info
*info
;
496 Elf_Internal_Sym
*sym
;
499 struct elf_link_hash_entry
**sym_hash
;
501 boolean
*type_change_ok
;
502 boolean
*size_change_ok
;
506 struct elf_link_hash_entry
*h
;
509 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
514 bind
= ELF_ST_BIND (sym
->st_info
);
516 if (! bfd_is_und_section (sec
))
517 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
519 h
= ((struct elf_link_hash_entry
*)
520 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
525 /* This code is for coping with dynamic objects, and is only useful
526 if we are doing an ELF link. */
527 if (info
->hash
->creator
!= abfd
->xvec
)
530 /* For merging, we only care about real symbols. */
532 while (h
->root
.type
== bfd_link_hash_indirect
533 || h
->root
.type
== bfd_link_hash_warning
)
534 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
536 /* If we just created the symbol, mark it as being an ELF symbol.
537 Other than that, there is nothing to do--there is no merge issue
538 with a newly defined symbol--so we just return. */
540 if (h
->root
.type
== bfd_link_hash_new
)
542 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
546 /* OLDBFD is a BFD associated with the existing symbol. */
548 switch (h
->root
.type
)
554 case bfd_link_hash_undefined
:
555 case bfd_link_hash_undefweak
:
556 oldbfd
= h
->root
.u
.undef
.abfd
;
559 case bfd_link_hash_defined
:
560 case bfd_link_hash_defweak
:
561 oldbfd
= h
->root
.u
.def
.section
->owner
;
564 case bfd_link_hash_common
:
565 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
569 /* In cases involving weak versioned symbols, we may wind up trying
570 to merge a symbol with itself. Catch that here, to avoid the
571 confusion that results if we try to override a symbol with
572 itself. The additional tests catch cases like
573 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
574 dynamic object, which we do want to handle here. */
576 && ((abfd
->flags
& DYNAMIC
) == 0
577 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
580 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
581 respectively, is from a dynamic object. */
583 if ((abfd
->flags
& DYNAMIC
) != 0)
589 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
594 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
595 indices used by MIPS ELF. */
596 switch (h
->root
.type
)
602 case bfd_link_hash_defined
:
603 case bfd_link_hash_defweak
:
604 hsec
= h
->root
.u
.def
.section
;
607 case bfd_link_hash_common
:
608 hsec
= h
->root
.u
.c
.p
->section
;
615 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
618 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
619 respectively, appear to be a definition rather than reference. */
621 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
626 if (h
->root
.type
== bfd_link_hash_undefined
627 || h
->root
.type
== bfd_link_hash_undefweak
628 || h
->root
.type
== bfd_link_hash_common
)
633 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
634 symbol, respectively, appears to be a common symbol in a dynamic
635 object. If a symbol appears in an uninitialized section, and is
636 not weak, and is not a function, then it may be a common symbol
637 which was resolved when the dynamic object was created. We want
638 to treat such symbols specially, because they raise special
639 considerations when setting the symbol size: if the symbol
640 appears as a common symbol in a regular object, and the size in
641 the regular object is larger, we must make sure that we use the
642 larger size. This problematic case can always be avoided in C,
643 but it must be handled correctly when using Fortran shared
646 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
647 likewise for OLDDYNCOMMON and OLDDEF.
649 Note that this test is just a heuristic, and that it is quite
650 possible to have an uninitialized symbol in a shared object which
651 is really a definition, rather than a common symbol. This could
652 lead to some minor confusion when the symbol really is a common
653 symbol in some regular object. However, I think it will be
658 && (sec
->flags
& SEC_ALLOC
) != 0
659 && (sec
->flags
& SEC_LOAD
) == 0
662 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
665 newdyncommon
= false;
669 && h
->root
.type
== bfd_link_hash_defined
670 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
671 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
672 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
674 && h
->type
!= STT_FUNC
)
677 olddyncommon
= false;
679 /* It's OK to change the type if either the existing symbol or the
680 new symbol is weak unless it comes from a DT_NEEDED entry of
681 a shared object, in which case, the DT_NEEDED entry may not be
682 required at the run time. */
684 if ((! dt_needed
&& h
->root
.type
== bfd_link_hash_defweak
)
685 || h
->root
.type
== bfd_link_hash_undefweak
687 *type_change_ok
= true;
689 /* It's OK to change the size if either the existing symbol or the
690 new symbol is weak, or if the old symbol is undefined. */
693 || h
->root
.type
== bfd_link_hash_undefined
)
694 *size_change_ok
= true;
696 /* If both the old and the new symbols look like common symbols in a
697 dynamic object, set the size of the symbol to the larger of the
702 && sym
->st_size
!= h
->size
)
704 /* Since we think we have two common symbols, issue a multiple
705 common warning if desired. Note that we only warn if the
706 size is different. If the size is the same, we simply let
707 the old symbol override the new one as normally happens with
708 symbols defined in dynamic objects. */
710 if (! ((*info
->callbacks
->multiple_common
)
711 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
712 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
715 if (sym
->st_size
> h
->size
)
716 h
->size
= sym
->st_size
;
718 *size_change_ok
= true;
721 /* If we are looking at a dynamic object, and we have found a
722 definition, we need to see if the symbol was already defined by
723 some other object. If so, we want to use the existing
724 definition, and we do not want to report a multiple symbol
725 definition error; we do this by clobbering *PSEC to be
728 We treat a common symbol as a definition if the symbol in the
729 shared library is a function, since common symbols always
730 represent variables; this can cause confusion in principle, but
731 any such confusion would seem to indicate an erroneous program or
732 shared library. We also permit a common symbol in a regular
733 object to override a weak symbol in a shared object.
735 We prefer a non-weak definition in a shared library to a weak
736 definition in the executable unless it comes from a DT_NEEDED
737 entry of a shared object, in which case, the DT_NEEDED entry
738 may not be required at the run time. */
743 || (h
->root
.type
== bfd_link_hash_common
745 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
746 && (h
->root
.type
!= bfd_link_hash_defweak
748 || bind
== STB_WEAK
))
752 newdyncommon
= false;
754 *psec
= sec
= bfd_und_section_ptr
;
755 *size_change_ok
= true;
757 /* If we get here when the old symbol is a common symbol, then
758 we are explicitly letting it override a weak symbol or
759 function in a dynamic object, and we don't want to warn about
760 a type change. If the old symbol is a defined symbol, a type
761 change warning may still be appropriate. */
763 if (h
->root
.type
== bfd_link_hash_common
)
764 *type_change_ok
= true;
767 /* Handle the special case of an old common symbol merging with a
768 new symbol which looks like a common symbol in a shared object.
769 We change *PSEC and *PVALUE to make the new symbol look like a
770 common symbol, and let _bfd_generic_link_add_one_symbol will do
774 && h
->root
.type
== bfd_link_hash_common
)
778 newdyncommon
= false;
779 *pvalue
= sym
->st_size
;
780 *psec
= sec
= bfd_com_section_ptr
;
781 *size_change_ok
= true;
784 /* If the old symbol is from a dynamic object, and the new symbol is
785 a definition which is not from a dynamic object, then the new
786 symbol overrides the old symbol. Symbols from regular files
787 always take precedence over symbols from dynamic objects, even if
788 they are defined after the dynamic object in the link.
790 As above, we again permit a common symbol in a regular object to
791 override a definition in a shared object if the shared object
792 symbol is a function or is weak.
794 As above, we permit a non-weak definition in a shared object to
795 override a weak definition in a regular object. */
799 || (bfd_is_com_section (sec
)
800 && (h
->root
.type
== bfd_link_hash_defweak
801 || h
->type
== STT_FUNC
)))
804 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
806 || h
->root
.type
== bfd_link_hash_defweak
))
808 /* Change the hash table entry to undefined, and let
809 _bfd_generic_link_add_one_symbol do the right thing with the
812 h
->root
.type
= bfd_link_hash_undefined
;
813 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
814 *size_change_ok
= true;
817 olddyncommon
= false;
819 /* We again permit a type change when a common symbol may be
820 overriding a function. */
822 if (bfd_is_com_section (sec
))
823 *type_change_ok
= true;
825 /* This union may have been set to be non-NULL when this symbol
826 was seen in a dynamic object. We must force the union to be
827 NULL, so that it is correct for a regular symbol. */
829 h
->verinfo
.vertree
= NULL
;
831 /* In this special case, if H is the target of an indirection,
832 we want the caller to frob with H rather than with the
833 indirect symbol. That will permit the caller to redefine the
834 target of the indirection, rather than the indirect symbol
835 itself. FIXME: This will break the -y option if we store a
836 symbol with a different name. */
840 /* Handle the special case of a new common symbol merging with an
841 old symbol that looks like it might be a common symbol defined in
842 a shared object. Note that we have already handled the case in
843 which a new common symbol should simply override the definition
844 in the shared library. */
847 && bfd_is_com_section (sec
)
850 /* It would be best if we could set the hash table entry to a
851 common symbol, but we don't know what to use for the section
853 if (! ((*info
->callbacks
->multiple_common
)
854 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
855 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
858 /* If the predumed common symbol in the dynamic object is
859 larger, pretend that the new symbol has its size. */
861 if (h
->size
> *pvalue
)
864 /* FIXME: We no longer know the alignment required by the symbol
865 in the dynamic object, so we just wind up using the one from
866 the regular object. */
869 olddyncommon
= false;
871 h
->root
.type
= bfd_link_hash_undefined
;
872 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
874 *size_change_ok
= true;
875 *type_change_ok
= true;
877 h
->verinfo
.vertree
= NULL
;
880 /* Handle the special case of a weak definition in a regular object
881 followed by a non-weak definition in a shared object. In this
882 case, we prefer the definition in the shared object unless it
883 comes from a DT_NEEDED entry of a shared object, in which case,
884 the DT_NEEDED entry may not be required at the run time. */
887 && h
->root
.type
== bfd_link_hash_defweak
892 /* To make this work we have to frob the flags so that the rest
893 of the code does not think we are using the regular
895 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
896 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
897 else if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
898 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
899 h
->elf_link_hash_flags
&= ~ (ELF_LINK_HASH_DEF_REGULAR
900 | ELF_LINK_HASH_DEF_DYNAMIC
);
902 /* If H is the target of an indirection, we want the caller to
903 use H rather than the indirect symbol. Otherwise if we are
904 defining a new indirect symbol we will wind up attaching it
905 to the entry we are overriding. */
909 /* Handle the special case of a non-weak definition in a shared
910 object followed by a weak definition in a regular object. In
911 this case we prefer to definition in the shared object. To make
912 this work we have to tell the caller to not treat the new symbol
916 && h
->root
.type
!= bfd_link_hash_defweak
925 /* This function is called to create an indirect symbol from the
926 default for the symbol with the default version if needed. The
927 symbol is described by H, NAME, SYM, SEC, VALUE, and OVERRIDE. We
928 set DYNSYM if the new indirect symbol is dynamic. DT_NEEDED
929 indicates if it comes from a DT_NEEDED entry of a shared object. */
932 elf_add_default_symbol (abfd
, info
, h
, name
, sym
, sec
, value
,
933 dynsym
, override
, dt_needed
)
935 struct bfd_link_info
*info
;
936 struct elf_link_hash_entry
*h
;
938 Elf_Internal_Sym
*sym
;
945 boolean type_change_ok
;
946 boolean size_change_ok
;
948 struct elf_link_hash_entry
*hi
;
949 struct elf_backend_data
*bed
;
954 /* If this symbol has a version, and it is the default version, we
955 create an indirect symbol from the default name to the fully
956 decorated name. This will cause external references which do not
957 specify a version to be bound to this version of the symbol. */
958 p
= strchr (name
, ELF_VER_CHR
);
959 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
964 /* We are overridden by an old defition. We need to check if we
965 need to crreate the indirect symbol from the default name. */
966 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, true,
968 BFD_ASSERT (hi
!= NULL
);
971 while (hi
->root
.type
== bfd_link_hash_indirect
972 || hi
->root
.type
== bfd_link_hash_warning
)
974 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
980 bed
= get_elf_backend_data (abfd
);
981 collect
= bed
->collect
;
982 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
984 shortname
= bfd_hash_allocate (&info
->hash
->table
,
985 (size_t) (p
- name
+ 1));
986 if (shortname
== NULL
)
988 strncpy (shortname
, name
, (size_t) (p
- name
));
989 shortname
[p
- name
] = '\0';
991 /* We are going to create a new symbol. Merge it with any existing
992 symbol with this name. For the purposes of the merge, act as
993 though we were defining the symbol we just defined, although we
994 actually going to define an indirect symbol. */
995 type_change_ok
= false;
996 size_change_ok
= false;
997 if (! elf_merge_symbol (abfd
, info
, shortname
, sym
, sec
, value
,
998 &hi
, &override
, &type_change_ok
,
999 &size_change_ok
, dt_needed
))
1004 if (! (_bfd_generic_link_add_one_symbol
1005 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1006 (bfd_vma
) 0, name
, false, collect
,
1007 (struct bfd_link_hash_entry
**) &hi
)))
1012 /* In this case the symbol named SHORTNAME is overriding the
1013 indirect symbol we want to add. We were planning on making
1014 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1015 is the name without a version. NAME is the fully versioned
1016 name, and it is the default version.
1018 Overriding means that we already saw a definition for the
1019 symbol SHORTNAME in a regular object, and it is overriding
1020 the symbol defined in the dynamic object.
1022 When this happens, we actually want to change NAME, the
1023 symbol we just added, to refer to SHORTNAME. This will cause
1024 references to NAME in the shared object to become references
1025 to SHORTNAME in the regular object. This is what we expect
1026 when we override a function in a shared object: that the
1027 references in the shared object will be mapped to the
1028 definition in the regular object. */
1030 while (hi
->root
.type
== bfd_link_hash_indirect
1031 || hi
->root
.type
== bfd_link_hash_warning
)
1032 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1034 h
->root
.type
= bfd_link_hash_indirect
;
1035 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1036 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1038 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1039 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1040 if (hi
->elf_link_hash_flags
1041 & (ELF_LINK_HASH_REF_REGULAR
1042 | ELF_LINK_HASH_DEF_REGULAR
))
1044 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1049 /* Now set HI to H, so that the following code will set the
1050 other fields correctly. */
1054 /* If there is a duplicate definition somewhere, then HI may not
1055 point to an indirect symbol. We will have reported an error to
1056 the user in that case. */
1058 if (hi
->root
.type
== bfd_link_hash_indirect
)
1060 struct elf_link_hash_entry
*ht
;
1062 /* If the symbol became indirect, then we assume that we have
1063 not seen a definition before. */
1064 BFD_ASSERT ((hi
->elf_link_hash_flags
1065 & (ELF_LINK_HASH_DEF_DYNAMIC
1066 | ELF_LINK_HASH_DEF_REGULAR
)) == 0);
1068 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1069 (*bed
->elf_backend_copy_indirect_symbol
) (ht
, hi
);
1071 /* See if the new flags lead us to realize that the symbol must
1078 || ((hi
->elf_link_hash_flags
1079 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1084 if ((hi
->elf_link_hash_flags
1085 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1091 /* We also need to define an indirection from the nondefault version
1094 shortname
= bfd_hash_allocate (&info
->hash
->table
, strlen (name
));
1095 if (shortname
== NULL
)
1097 strncpy (shortname
, name
, (size_t) (p
- name
));
1098 strcpy (shortname
+ (p
- name
), p
+ 1);
1100 /* Once again, merge with any existing symbol. */
1101 type_change_ok
= false;
1102 size_change_ok
= false;
1103 if (! elf_merge_symbol (abfd
, info
, shortname
, sym
, sec
, value
,
1104 &hi
, &override
, &type_change_ok
,
1105 &size_change_ok
, dt_needed
))
1110 /* Here SHORTNAME is a versioned name, so we don't expect to see
1111 the type of override we do in the case above. */
1112 (*_bfd_error_handler
)
1113 (_("%s: warning: unexpected redefinition of `%s'"),
1114 bfd_archive_filename (abfd
), shortname
);
1118 if (! (_bfd_generic_link_add_one_symbol
1119 (info
, abfd
, shortname
, BSF_INDIRECT
,
1120 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1121 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1124 /* If there is a duplicate definition somewhere, then HI may not
1125 point to an indirect symbol. We will have reported an error
1126 to the user in that case. */
1128 if (hi
->root
.type
== bfd_link_hash_indirect
)
1130 /* If the symbol became indirect, then we assume that we have
1131 not seen a definition before. */
1132 BFD_ASSERT ((hi
->elf_link_hash_flags
1133 & (ELF_LINK_HASH_DEF_DYNAMIC
1134 | ELF_LINK_HASH_DEF_REGULAR
)) == 0);
1136 (*bed
->elf_backend_copy_indirect_symbol
) (h
, hi
);
1138 /* See if the new flags lead us to realize that the symbol
1145 || ((hi
->elf_link_hash_flags
1146 & ELF_LINK_HASH_REF_DYNAMIC
) != 0))
1151 if ((hi
->elf_link_hash_flags
1152 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1162 /* Add symbols from an ELF object file to the linker hash table. */
1165 elf_link_add_object_symbols (abfd
, info
)
1167 struct bfd_link_info
*info
;
1169 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
1170 const Elf_Internal_Sym
*,
1171 const char **, flagword
*,
1172 asection
**, bfd_vma
*));
1173 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
1174 asection
*, const Elf_Internal_Rela
*));
1176 Elf_Internal_Shdr
*hdr
;
1177 Elf_Internal_Shdr
*shndx_hdr
;
1178 bfd_size_type symcount
;
1179 bfd_size_type extsymcount
;
1180 bfd_size_type extsymoff
;
1181 Elf_External_Sym
*buf
= NULL
;
1182 Elf_External_Sym_Shndx
*shndx_buf
= NULL
;
1183 Elf_External_Sym_Shndx
*shndx
;
1184 struct elf_link_hash_entry
**sym_hash
;
1186 Elf_External_Versym
*extversym
= NULL
;
1187 Elf_External_Versym
*ever
;
1188 Elf_External_Dyn
*dynbuf
= NULL
;
1189 struct elf_link_hash_entry
*weaks
;
1190 Elf_External_Sym
*esym
;
1191 Elf_External_Sym
*esymend
;
1192 struct elf_backend_data
*bed
;
1194 struct elf_link_hash_table
* hash_table
;
1198 hash_table
= elf_hash_table (info
);
1200 bed
= get_elf_backend_data (abfd
);
1201 add_symbol_hook
= bed
->elf_add_symbol_hook
;
1202 collect
= bed
->collect
;
1204 if ((abfd
->flags
& DYNAMIC
) == 0)
1210 /* You can't use -r against a dynamic object. Also, there's no
1211 hope of using a dynamic object which does not exactly match
1212 the format of the output file. */
1213 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
1215 bfd_set_error (bfd_error_invalid_operation
);
1220 /* As a GNU extension, any input sections which are named
1221 .gnu.warning.SYMBOL are treated as warning symbols for the given
1222 symbol. This differs from .gnu.warning sections, which generate
1223 warnings when they are included in an output file. */
1228 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
1232 name
= bfd_get_section_name (abfd
, s
);
1233 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
1238 name
+= sizeof ".gnu.warning." - 1;
1240 /* If this is a shared object, then look up the symbol
1241 in the hash table. If it is there, and it is already
1242 been defined, then we will not be using the entry
1243 from this shared object, so we don't need to warn.
1244 FIXME: If we see the definition in a regular object
1245 later on, we will warn, but we shouldn't. The only
1246 fix is to keep track of what warnings we are supposed
1247 to emit, and then handle them all at the end of the
1249 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
1251 struct elf_link_hash_entry
*h
;
1253 h
= elf_link_hash_lookup (hash_table
, name
,
1254 false, false, true);
1256 /* FIXME: What about bfd_link_hash_common? */
1258 && (h
->root
.type
== bfd_link_hash_defined
1259 || h
->root
.type
== bfd_link_hash_defweak
))
1261 /* We don't want to issue this warning. Clobber
1262 the section size so that the warning does not
1263 get copied into the output file. */
1269 sz
= bfd_section_size (abfd
, s
);
1270 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
1274 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
1279 if (! (_bfd_generic_link_add_one_symbol
1280 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
1281 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
1284 if (! info
->relocateable
)
1286 /* Clobber the section size so that the warning does
1287 not get copied into the output file. */
1294 /* If this is a dynamic object, we always link against the .dynsym
1295 symbol table, not the .symtab symbol table. The dynamic linker
1296 will only see the .dynsym symbol table, so there is no reason to
1297 look at .symtab for a dynamic object. */
1299 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
1301 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1302 shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
1306 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1312 /* Read in any version definitions. */
1314 if (! _bfd_elf_slurp_version_tables (abfd
))
1317 /* Read in the symbol versions, but don't bother to convert them
1318 to internal format. */
1319 if (elf_dynversym (abfd
) != 0)
1321 Elf_Internal_Shdr
*versymhdr
;
1323 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1324 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
1325 if (extversym
== NULL
)
1327 amt
= versymhdr
->sh_size
;
1328 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
1329 || bfd_bread ((PTR
) extversym
, amt
, abfd
) != amt
)
1334 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1336 /* The sh_info field of the symtab header tells us where the
1337 external symbols start. We don't care about the local symbols at
1339 if (elf_bad_symtab (abfd
))
1341 extsymcount
= symcount
;
1346 extsymcount
= symcount
- hdr
->sh_info
;
1347 extsymoff
= hdr
->sh_info
;
1350 amt
= extsymcount
* sizeof (Elf_External_Sym
);
1351 buf
= (Elf_External_Sym
*) bfd_malloc (amt
);
1352 if (buf
== NULL
&& extsymcount
!= 0)
1355 if (shndx_hdr
!= NULL
&& shndx_hdr
->sh_size
!= 0)
1357 amt
= extsymcount
* sizeof (Elf_External_Sym_Shndx
);
1358 shndx_buf
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
1359 if (shndx_buf
== NULL
&& extsymcount
!= 0)
1363 /* We store a pointer to the hash table entry for each external
1365 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
1366 sym_hash
= (struct elf_link_hash_entry
**) bfd_alloc (abfd
, amt
);
1367 if (sym_hash
== NULL
)
1369 elf_sym_hashes (abfd
) = sym_hash
;
1375 /* If we are creating a shared library, create all the dynamic
1376 sections immediately. We need to attach them to something,
1377 so we attach them to this BFD, provided it is the right
1378 format. FIXME: If there are no input BFD's of the same
1379 format as the output, we can't make a shared library. */
1381 && is_elf_hash_table (info
)
1382 && ! hash_table
->dynamic_sections_created
1383 && abfd
->xvec
== info
->hash
->creator
)
1385 if (! elf_link_create_dynamic_sections (abfd
, info
))
1389 else if (! is_elf_hash_table (info
))
1396 bfd_size_type oldsize
;
1397 bfd_size_type strindex
;
1399 /* Find the name to use in a DT_NEEDED entry that refers to this
1400 object. If the object has a DT_SONAME entry, we use it.
1401 Otherwise, if the generic linker stuck something in
1402 elf_dt_name, we use that. Otherwise, we just use the file
1403 name. If the generic linker put a null string into
1404 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1405 there is a DT_SONAME entry. */
1407 name
= bfd_get_filename (abfd
);
1408 if (elf_dt_name (abfd
) != NULL
)
1410 name
= elf_dt_name (abfd
);
1413 if (elf_dt_soname (abfd
) != NULL
)
1419 s
= bfd_get_section_by_name (abfd
, ".dynamic");
1422 Elf_External_Dyn
*extdyn
;
1423 Elf_External_Dyn
*extdynend
;
1425 unsigned long shlink
;
1429 dynbuf
= (Elf_External_Dyn
*) bfd_malloc (s
->_raw_size
);
1433 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
1434 (file_ptr
) 0, s
->_raw_size
))
1437 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1440 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1443 /* The shared libraries distributed with hpux11 have a bogus
1444 sh_link field for the ".dynamic" section. This code detects
1445 when SHLINK refers to a section that is not a string table
1446 and tries to find the string table for the ".dynsym" section
1448 Elf_Internal_Shdr
*shdr
= elf_elfsections (abfd
)[shlink
];
1449 if (shdr
->sh_type
!= SHT_STRTAB
)
1451 asection
*ds
= bfd_get_section_by_name (abfd
, ".dynsym");
1452 int elfdsec
= _bfd_elf_section_from_bfd_section (abfd
, ds
);
1455 shlink
= elf_elfsections (abfd
)[elfdsec
]->sh_link
;
1460 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
1463 for (; extdyn
< extdynend
; extdyn
++)
1465 Elf_Internal_Dyn dyn
;
1467 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1468 if (dyn
.d_tag
== DT_SONAME
)
1470 unsigned int tagv
= dyn
.d_un
.d_val
;
1471 name
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1475 if (dyn
.d_tag
== DT_NEEDED
)
1477 struct bfd_link_needed_list
*n
, **pn
;
1479 unsigned int tagv
= dyn
.d_un
.d_val
;
1481 amt
= sizeof (struct bfd_link_needed_list
);
1482 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1483 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1484 if (n
== NULL
|| fnm
== NULL
)
1486 anm
= bfd_alloc (abfd
, (bfd_size_type
) strlen (fnm
) + 1);
1493 for (pn
= & hash_table
->needed
;
1499 if (dyn
.d_tag
== DT_RUNPATH
)
1501 struct bfd_link_needed_list
*n
, **pn
;
1503 unsigned int tagv
= dyn
.d_un
.d_val
;
1505 /* When we see DT_RPATH before DT_RUNPATH, we have
1506 to clear runpath. Do _NOT_ bfd_release, as that
1507 frees all more recently bfd_alloc'd blocks as
1509 if (rpath
&& hash_table
->runpath
)
1510 hash_table
->runpath
= NULL
;
1512 amt
= sizeof (struct bfd_link_needed_list
);
1513 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1514 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1515 if (n
== NULL
|| fnm
== NULL
)
1517 anm
= bfd_alloc (abfd
, (bfd_size_type
) strlen (fnm
) + 1);
1524 for (pn
= & hash_table
->runpath
;
1532 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1533 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
1535 struct bfd_link_needed_list
*n
, **pn
;
1537 unsigned int tagv
= dyn
.d_un
.d_val
;
1539 amt
= sizeof (struct bfd_link_needed_list
);
1540 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
1541 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
1542 if (n
== NULL
|| fnm
== NULL
)
1544 anm
= bfd_alloc (abfd
, (bfd_size_type
) strlen (fnm
) + 1);
1551 for (pn
= & hash_table
->runpath
;
1564 /* We do not want to include any of the sections in a dynamic
1565 object in the output file. We hack by simply clobbering the
1566 list of sections in the BFD. This could be handled more
1567 cleanly by, say, a new section flag; the existing
1568 SEC_NEVER_LOAD flag is not the one we want, because that one
1569 still implies that the section takes up space in the output
1571 bfd_section_list_clear (abfd
);
1573 /* If this is the first dynamic object found in the link, create
1574 the special sections required for dynamic linking. */
1575 if (! hash_table
->dynamic_sections_created
)
1576 if (! elf_link_create_dynamic_sections (abfd
, info
))
1581 /* Add a DT_NEEDED entry for this dynamic object. */
1582 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
1583 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, name
, false);
1584 if (strindex
== (bfd_size_type
) -1)
1587 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
1590 Elf_External_Dyn
*dyncon
, *dynconend
;
1592 /* The hash table size did not change, which means that
1593 the dynamic object name was already entered. If we
1594 have already included this dynamic object in the
1595 link, just ignore it. There is no reason to include
1596 a particular dynamic object more than once. */
1597 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
1598 BFD_ASSERT (sdyn
!= NULL
);
1600 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1601 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1603 for (; dyncon
< dynconend
; dyncon
++)
1605 Elf_Internal_Dyn dyn
;
1607 elf_swap_dyn_in (hash_table
->dynobj
, dyncon
, & dyn
);
1608 if (dyn
.d_tag
== DT_NEEDED
1609 && dyn
.d_un
.d_val
== strindex
)
1613 if (extversym
!= NULL
)
1615 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
1621 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NEEDED
, strindex
))
1625 /* Save the SONAME, if there is one, because sometimes the
1626 linker emulation code will need to know it. */
1628 name
= basename (bfd_get_filename (abfd
));
1629 elf_dt_name (abfd
) = name
;
1632 pos
= hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
);
1633 amt
= extsymcount
* sizeof (Elf_External_Sym
);
1634 if (bfd_seek (abfd
, pos
, SEEK_SET
) != 0
1635 || bfd_bread ((PTR
) buf
, amt
, abfd
) != amt
)
1638 if (shndx_hdr
!= NULL
&& shndx_hdr
->sh_size
!= 0)
1640 amt
= extsymcount
* sizeof (Elf_External_Sym_Shndx
);
1641 pos
= shndx_hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym_Shndx
);
1642 if (bfd_seek (abfd
, pos
, SEEK_SET
) != 0
1643 || bfd_bread ((PTR
) shndx_buf
, amt
, abfd
) != amt
)
1649 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1650 esymend
= buf
+ extsymcount
;
1651 for (esym
= buf
, shndx
= shndx_buf
;
1653 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
),
1654 shndx
= (shndx
!= NULL
? shndx
+ 1 : NULL
))
1656 Elf_Internal_Sym sym
;
1662 struct elf_link_hash_entry
*h
;
1664 boolean size_change_ok
, type_change_ok
;
1665 boolean new_weakdef
;
1666 unsigned int old_alignment
;
1671 elf_swap_symbol_in (abfd
, esym
, shndx
, &sym
);
1673 flags
= BSF_NO_FLAGS
;
1675 value
= sym
.st_value
;
1678 bind
= ELF_ST_BIND (sym
.st_info
);
1679 if (bind
== STB_LOCAL
)
1681 /* This should be impossible, since ELF requires that all
1682 global symbols follow all local symbols, and that sh_info
1683 point to the first global symbol. Unfortunatealy, Irix 5
1687 else if (bind
== STB_GLOBAL
)
1689 if (sym
.st_shndx
!= SHN_UNDEF
1690 && sym
.st_shndx
!= SHN_COMMON
)
1693 else if (bind
== STB_WEAK
)
1697 /* Leave it up to the processor backend. */
1700 if (sym
.st_shndx
== SHN_UNDEF
)
1701 sec
= bfd_und_section_ptr
;
1702 else if (sym
.st_shndx
< SHN_LORESERVE
|| sym
.st_shndx
> SHN_HIRESERVE
)
1704 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1706 sec
= bfd_abs_section_ptr
;
1707 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1710 else if (sym
.st_shndx
== SHN_ABS
)
1711 sec
= bfd_abs_section_ptr
;
1712 else if (sym
.st_shndx
== SHN_COMMON
)
1714 sec
= bfd_com_section_ptr
;
1715 /* What ELF calls the size we call the value. What ELF
1716 calls the value we call the alignment. */
1717 value
= sym
.st_size
;
1721 /* Leave it up to the processor backend. */
1724 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1725 if (name
== (const char *) NULL
)
1728 if (add_symbol_hook
)
1730 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1734 /* The hook function sets the name to NULL if this symbol
1735 should be skipped for some reason. */
1736 if (name
== (const char *) NULL
)
1740 /* Sanity check that all possibilities were handled. */
1741 if (sec
== (asection
*) NULL
)
1743 bfd_set_error (bfd_error_bad_value
);
1747 if (bfd_is_und_section (sec
)
1748 || bfd_is_com_section (sec
))
1753 size_change_ok
= false;
1754 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1756 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1758 Elf_Internal_Versym iver
;
1759 unsigned int vernum
= 0;
1763 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1764 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1766 /* If this is a hidden symbol, or if it is not version
1767 1, we append the version name to the symbol name.
1768 However, we do not modify a non-hidden absolute
1769 symbol, because it might be the version symbol
1770 itself. FIXME: What if it isn't? */
1771 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1772 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1775 unsigned int namelen
;
1776 bfd_size_type newlen
;
1779 if (sym
.st_shndx
!= SHN_UNDEF
)
1781 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1783 (*_bfd_error_handler
)
1784 (_("%s: %s: invalid version %u (max %d)"),
1785 bfd_archive_filename (abfd
), name
, vernum
,
1786 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1787 bfd_set_error (bfd_error_bad_value
);
1790 else if (vernum
> 1)
1792 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1798 /* We cannot simply test for the number of
1799 entries in the VERNEED section since the
1800 numbers for the needed versions do not start
1802 Elf_Internal_Verneed
*t
;
1805 for (t
= elf_tdata (abfd
)->verref
;
1809 Elf_Internal_Vernaux
*a
;
1811 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1813 if (a
->vna_other
== vernum
)
1815 verstr
= a
->vna_nodename
;
1824 (*_bfd_error_handler
)
1825 (_("%s: %s: invalid needed version %d"),
1826 bfd_archive_filename (abfd
), name
, vernum
);
1827 bfd_set_error (bfd_error_bad_value
);
1832 namelen
= strlen (name
);
1833 newlen
= namelen
+ strlen (verstr
) + 2;
1834 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1837 newname
= (char *) bfd_alloc (abfd
, newlen
);
1838 if (newname
== NULL
)
1840 strcpy (newname
, name
);
1841 p
= newname
+ namelen
;
1843 /* If this is a defined non-hidden version symbol,
1844 we add another @ to the name. This indicates the
1845 default version of the symbol. */
1846 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1847 && sym
.st_shndx
!= SHN_UNDEF
)
1855 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1856 sym_hash
, &override
, &type_change_ok
,
1857 &size_change_ok
, dt_needed
))
1864 while (h
->root
.type
== bfd_link_hash_indirect
1865 || h
->root
.type
== bfd_link_hash_warning
)
1866 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1868 /* Remember the old alignment if this is a common symbol, so
1869 that we don't reduce the alignment later on. We can't
1870 check later, because _bfd_generic_link_add_one_symbol
1871 will set a default for the alignment which we want to
1873 if (h
->root
.type
== bfd_link_hash_common
)
1874 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1876 if (elf_tdata (abfd
)->verdef
!= NULL
1880 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1883 if (! (_bfd_generic_link_add_one_symbol
1884 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1885 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1889 while (h
->root
.type
== bfd_link_hash_indirect
1890 || h
->root
.type
== bfd_link_hash_warning
)
1891 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1894 new_weakdef
= false;
1897 && (flags
& BSF_WEAK
) != 0
1898 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1899 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1900 && h
->weakdef
== NULL
)
1902 /* Keep a list of all weak defined non function symbols from
1903 a dynamic object, using the weakdef field. Later in this
1904 function we will set the weakdef field to the correct
1905 value. We only put non-function symbols from dynamic
1906 objects on this list, because that happens to be the only
1907 time we need to know the normal symbol corresponding to a
1908 weak symbol, and the information is time consuming to
1909 figure out. If the weakdef field is not already NULL,
1910 then this symbol was already defined by some previous
1911 dynamic object, and we will be using that previous
1912 definition anyhow. */
1919 /* Set the alignment of a common symbol. */
1920 if (sym
.st_shndx
== SHN_COMMON
1921 && h
->root
.type
== bfd_link_hash_common
)
1925 align
= bfd_log2 (sym
.st_value
);
1926 if (align
> old_alignment
1927 /* Permit an alignment power of zero if an alignment of one
1928 is specified and no other alignments have been specified. */
1929 || (sym
.st_value
== 1 && old_alignment
== 0))
1930 h
->root
.u
.c
.p
->alignment_power
= align
;
1933 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1939 /* Remember the symbol size and type. */
1940 if (sym
.st_size
!= 0
1941 && (definition
|| h
->size
== 0))
1943 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1944 (*_bfd_error_handler
)
1945 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1946 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1947 bfd_archive_filename (abfd
));
1949 h
->size
= sym
.st_size
;
1952 /* If this is a common symbol, then we always want H->SIZE
1953 to be the size of the common symbol. The code just above
1954 won't fix the size if a common symbol becomes larger. We
1955 don't warn about a size change here, because that is
1956 covered by --warn-common. */
1957 if (h
->root
.type
== bfd_link_hash_common
)
1958 h
->size
= h
->root
.u
.c
.size
;
1960 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1961 && (definition
|| h
->type
== STT_NOTYPE
))
1963 if (h
->type
!= STT_NOTYPE
1964 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1965 && ! type_change_ok
)
1966 (*_bfd_error_handler
)
1967 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1968 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1969 bfd_archive_filename (abfd
));
1971 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1974 /* If st_other has a processor-specific meaning, specific code
1975 might be needed here. */
1976 if (sym
.st_other
!= 0)
1978 /* Combine visibilities, using the most constraining one. */
1979 unsigned char hvis
= ELF_ST_VISIBILITY (h
->other
);
1980 unsigned char symvis
= ELF_ST_VISIBILITY (sym
.st_other
);
1982 if (symvis
&& (hvis
> symvis
|| hvis
== 0))
1983 h
->other
= sym
.st_other
;
1985 /* If neither has visibility, use the st_other of the
1986 definition. This is an arbitrary choice, since the
1987 other bits have no general meaning. */
1988 if (!symvis
&& !hvis
1989 && (definition
|| h
->other
== 0))
1990 h
->other
= sym
.st_other
;
1993 /* Set a flag in the hash table entry indicating the type of
1994 reference or definition we just found. Keep a count of
1995 the number of dynamic symbols we find. A dynamic symbol
1996 is one which is referenced or defined by both a regular
1997 object and a shared object. */
1998 old_flags
= h
->elf_link_hash_flags
;
2004 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
2005 if (bind
!= STB_WEAK
)
2006 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
2009 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
2011 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2012 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
2018 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
2020 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
2021 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
2022 | ELF_LINK_HASH_REF_REGULAR
)) != 0
2023 || (h
->weakdef
!= NULL
2025 && h
->weakdef
->dynindx
!= -1))
2029 h
->elf_link_hash_flags
|= new_flag
;
2031 /* Check to see if we need to add an indirect symbol for
2032 the default name. */
2033 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
2034 if (! elf_add_default_symbol (abfd
, info
, h
, name
, &sym
,
2035 &sec
, &value
, &dynsym
,
2036 override
, dt_needed
))
2039 if (dynsym
&& h
->dynindx
== -1)
2041 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2043 if (h
->weakdef
!= NULL
2045 && h
->weakdef
->dynindx
== -1)
2047 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2051 else if (dynsym
&& h
->dynindx
!= -1)
2052 /* If the symbol already has a dynamic index, but
2053 visibility says it should not be visible, turn it into
2055 switch (ELF_ST_VISIBILITY (h
->other
))
2059 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2063 if (dt_needed
&& definition
2064 && (h
->elf_link_hash_flags
2065 & ELF_LINK_HASH_REF_REGULAR
) != 0)
2067 bfd_size_type oldsize
;
2068 bfd_size_type strindex
;
2070 if (! is_elf_hash_table (info
))
2073 /* The symbol from a DT_NEEDED object is referenced from
2074 the regular object to create a dynamic executable. We
2075 have to make sure there is a DT_NEEDED entry for it. */
2078 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
2079 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
,
2080 elf_dt_soname (abfd
), false);
2081 if (strindex
== (bfd_size_type
) -1)
2084 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
2087 Elf_External_Dyn
*dyncon
, *dynconend
;
2089 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
,
2091 BFD_ASSERT (sdyn
!= NULL
);
2093 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
2094 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
2096 for (; dyncon
< dynconend
; dyncon
++)
2098 Elf_Internal_Dyn dyn
;
2100 elf_swap_dyn_in (hash_table
->dynobj
,
2102 BFD_ASSERT (dyn
.d_tag
!= DT_NEEDED
||
2103 dyn
.d_un
.d_val
!= strindex
);
2107 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NEEDED
, strindex
))
2113 /* Now set the weakdefs field correctly for all the weak defined
2114 symbols we found. The only way to do this is to search all the
2115 symbols. Since we only need the information for non functions in
2116 dynamic objects, that's the only time we actually put anything on
2117 the list WEAKS. We need this information so that if a regular
2118 object refers to a symbol defined weakly in a dynamic object, the
2119 real symbol in the dynamic object is also put in the dynamic
2120 symbols; we also must arrange for both symbols to point to the
2121 same memory location. We could handle the general case of symbol
2122 aliasing, but a general symbol alias can only be generated in
2123 assembler code, handling it correctly would be very time
2124 consuming, and other ELF linkers don't handle general aliasing
2126 while (weaks
!= NULL
)
2128 struct elf_link_hash_entry
*hlook
;
2131 struct elf_link_hash_entry
**hpp
;
2132 struct elf_link_hash_entry
**hppend
;
2135 weaks
= hlook
->weakdef
;
2136 hlook
->weakdef
= NULL
;
2138 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
2139 || hlook
->root
.type
== bfd_link_hash_defweak
2140 || hlook
->root
.type
== bfd_link_hash_common
2141 || hlook
->root
.type
== bfd_link_hash_indirect
);
2142 slook
= hlook
->root
.u
.def
.section
;
2143 vlook
= hlook
->root
.u
.def
.value
;
2145 hpp
= elf_sym_hashes (abfd
);
2146 hppend
= hpp
+ extsymcount
;
2147 for (; hpp
< hppend
; hpp
++)
2149 struct elf_link_hash_entry
*h
;
2152 if (h
!= NULL
&& h
!= hlook
2153 && h
->root
.type
== bfd_link_hash_defined
2154 && h
->root
.u
.def
.section
== slook
2155 && h
->root
.u
.def
.value
== vlook
)
2159 /* If the weak definition is in the list of dynamic
2160 symbols, make sure the real definition is put there
2162 if (hlook
->dynindx
!= -1
2163 && h
->dynindx
== -1)
2165 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2169 /* If the real definition is in the list of dynamic
2170 symbols, make sure the weak definition is put there
2171 as well. If we don't do this, then the dynamic
2172 loader might not merge the entries for the real
2173 definition and the weak definition. */
2174 if (h
->dynindx
!= -1
2175 && hlook
->dynindx
== -1)
2177 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
2192 if (extversym
!= NULL
)
2198 /* If this object is the same format as the output object, and it is
2199 not a shared library, then let the backend look through the
2202 This is required to build global offset table entries and to
2203 arrange for dynamic relocs. It is not required for the
2204 particular common case of linking non PIC code, even when linking
2205 against shared libraries, but unfortunately there is no way of
2206 knowing whether an object file has been compiled PIC or not.
2207 Looking through the relocs is not particularly time consuming.
2208 The problem is that we must either (1) keep the relocs in memory,
2209 which causes the linker to require additional runtime memory or
2210 (2) read the relocs twice from the input file, which wastes time.
2211 This would be a good case for using mmap.
2213 I have no idea how to handle linking PIC code into a file of a
2214 different format. It probably can't be done. */
2215 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
2217 && abfd
->xvec
== info
->hash
->creator
2218 && check_relocs
!= NULL
)
2222 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2224 Elf_Internal_Rela
*internal_relocs
;
2227 if ((o
->flags
& SEC_RELOC
) == 0
2228 || o
->reloc_count
== 0
2229 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
2230 && (o
->flags
& SEC_DEBUGGING
) != 0)
2231 || bfd_is_abs_section (o
->output_section
))
2234 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
2235 (abfd
, o
, (PTR
) NULL
,
2236 (Elf_Internal_Rela
*) NULL
,
2237 info
->keep_memory
));
2238 if (internal_relocs
== NULL
)
2241 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
2243 if (! info
->keep_memory
)
2244 free (internal_relocs
);
2251 /* If this is a non-traditional, non-relocateable link, try to
2252 optimize the handling of the .stab/.stabstr sections. */
2254 && ! info
->relocateable
2255 && ! info
->traditional_format
2256 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
2257 && is_elf_hash_table (info
)
2258 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
2260 asection
*stab
, *stabstr
;
2262 stab
= bfd_get_section_by_name (abfd
, ".stab");
2263 if (stab
!= NULL
&& !(stab
->flags
& SEC_MERGE
))
2265 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
2267 if (stabstr
!= NULL
)
2269 struct bfd_elf_section_data
*secdata
;
2271 secdata
= elf_section_data (stab
);
2272 if (! _bfd_link_section_stabs (abfd
,
2273 & hash_table
->stab_info
,
2275 &secdata
->sec_info
))
2277 if (secdata
->sec_info
)
2278 secdata
->sec_info_type
= ELF_INFO_TYPE_STABS
;
2283 if (! info
->relocateable
&& ! dynamic
2284 && is_elf_hash_table (info
))
2288 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
2289 if (s
->flags
& SEC_MERGE
)
2291 struct bfd_elf_section_data
*secdata
;
2293 secdata
= elf_section_data (s
);
2294 if (! _bfd_merge_section (abfd
,
2295 & hash_table
->merge_info
,
2296 s
, &secdata
->sec_info
))
2298 else if (secdata
->sec_info
)
2299 secdata
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
2310 if (extversym
!= NULL
)
2315 /* Create some sections which will be filled in with dynamic linking
2316 information. ABFD is an input file which requires dynamic sections
2317 to be created. The dynamic sections take up virtual memory space
2318 when the final executable is run, so we need to create them before
2319 addresses are assigned to the output sections. We work out the
2320 actual contents and size of these sections later. */
2323 elf_link_create_dynamic_sections (abfd
, info
)
2325 struct bfd_link_info
*info
;
2328 register asection
*s
;
2329 struct elf_link_hash_entry
*h
;
2330 struct elf_backend_data
*bed
;
2332 if (! is_elf_hash_table (info
))
2335 if (elf_hash_table (info
)->dynamic_sections_created
)
2338 /* Make sure that all dynamic sections use the same input BFD. */
2339 if (elf_hash_table (info
)->dynobj
== NULL
)
2340 elf_hash_table (info
)->dynobj
= abfd
;
2342 abfd
= elf_hash_table (info
)->dynobj
;
2344 /* Note that we set the SEC_IN_MEMORY flag for all of these
2346 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
2347 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2349 /* A dynamically linked executable has a .interp section, but a
2350 shared library does not. */
2353 s
= bfd_make_section (abfd
, ".interp");
2355 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2359 if (! info
->traditional_format
2360 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
2362 s
= bfd_make_section (abfd
, ".eh_frame_hdr");
2364 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2365 || ! bfd_set_section_alignment (abfd
, s
, 2))
2369 /* Create sections to hold version informations. These are removed
2370 if they are not needed. */
2371 s
= bfd_make_section (abfd
, ".gnu.version_d");
2373 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2374 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2377 s
= bfd_make_section (abfd
, ".gnu.version");
2379 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2380 || ! bfd_set_section_alignment (abfd
, s
, 1))
2383 s
= bfd_make_section (abfd
, ".gnu.version_r");
2385 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2386 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2389 s
= bfd_make_section (abfd
, ".dynsym");
2391 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2392 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2395 s
= bfd_make_section (abfd
, ".dynstr");
2397 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2400 /* Create a strtab to hold the dynamic symbol names. */
2401 if (elf_hash_table (info
)->dynstr
== NULL
)
2403 elf_hash_table (info
)->dynstr
= _bfd_elf_strtab_init ();
2404 if (elf_hash_table (info
)->dynstr
== NULL
)
2408 s
= bfd_make_section (abfd
, ".dynamic");
2410 || ! bfd_set_section_flags (abfd
, s
, flags
)
2411 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2414 /* The special symbol _DYNAMIC is always set to the start of the
2415 .dynamic section. This call occurs before we have processed the
2416 symbols for any dynamic object, so we don't have to worry about
2417 overriding a dynamic definition. We could set _DYNAMIC in a
2418 linker script, but we only want to define it if we are, in fact,
2419 creating a .dynamic section. We don't want to define it if there
2420 is no .dynamic section, since on some ELF platforms the start up
2421 code examines it to decide how to initialize the process. */
2423 if (! (_bfd_generic_link_add_one_symbol
2424 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2425 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2426 (struct bfd_link_hash_entry
**) &h
)))
2428 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2429 h
->type
= STT_OBJECT
;
2432 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2435 bed
= get_elf_backend_data (abfd
);
2437 s
= bfd_make_section (abfd
, ".hash");
2439 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2440 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2442 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2444 /* Let the backend create the rest of the sections. This lets the
2445 backend set the right flags. The backend will normally create
2446 the .got and .plt sections. */
2447 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2450 elf_hash_table (info
)->dynamic_sections_created
= true;
2455 /* Add an entry to the .dynamic table. */
2458 elf_add_dynamic_entry (info
, tag
, val
)
2459 struct bfd_link_info
*info
;
2463 Elf_Internal_Dyn dyn
;
2466 bfd_size_type newsize
;
2467 bfd_byte
*newcontents
;
2469 if (! is_elf_hash_table (info
))
2472 dynobj
= elf_hash_table (info
)->dynobj
;
2474 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2475 BFD_ASSERT (s
!= NULL
);
2477 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2478 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2479 if (newcontents
== NULL
)
2483 dyn
.d_un
.d_val
= val
;
2484 elf_swap_dyn_out (dynobj
, &dyn
,
2485 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2487 s
->_raw_size
= newsize
;
2488 s
->contents
= newcontents
;
2493 /* Record a new local dynamic symbol. */
2496 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2497 struct bfd_link_info
*info
;
2501 struct elf_link_local_dynamic_entry
*entry
;
2502 struct elf_link_hash_table
*eht
;
2503 struct elf_strtab_hash
*dynstr
;
2504 Elf_External_Sym esym
;
2505 Elf_External_Sym_Shndx eshndx
;
2506 Elf_External_Sym_Shndx
*shndx
;
2507 unsigned long dynstr_index
;
2512 if (! is_elf_hash_table (info
))
2515 /* See if the entry exists already. */
2516 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2517 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2520 entry
= (struct elf_link_local_dynamic_entry
*)
2521 bfd_alloc (input_bfd
, (bfd_size_type
) sizeof (*entry
));
2525 /* Go find the symbol, so that we can find it's name. */
2526 amt
= sizeof (Elf_External_Sym
);
2527 pos
= elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
+ input_indx
* amt
;
2528 if (bfd_seek (input_bfd
, pos
, SEEK_SET
) != 0
2529 || bfd_bread ((PTR
) &esym
, amt
, input_bfd
) != amt
)
2532 if (elf_tdata (input_bfd
)->symtab_shndx_hdr
.sh_size
!= 0)
2534 amt
= sizeof (Elf_External_Sym_Shndx
);
2535 pos
= elf_tdata (input_bfd
)->symtab_shndx_hdr
.sh_offset
;
2536 pos
+= input_indx
* amt
;
2538 if (bfd_seek (input_bfd
, pos
, SEEK_SET
) != 0
2539 || bfd_bread ((PTR
) shndx
, amt
, input_bfd
) != amt
)
2542 elf_swap_symbol_in (input_bfd
, &esym
, shndx
, &entry
->isym
);
2544 name
= (bfd_elf_string_from_elf_section
2545 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2546 entry
->isym
.st_name
));
2548 dynstr
= elf_hash_table (info
)->dynstr
;
2551 /* Create a strtab to hold the dynamic symbol names. */
2552 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
2557 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, false);
2558 if (dynstr_index
== (unsigned long) -1)
2560 entry
->isym
.st_name
= dynstr_index
;
2562 eht
= elf_hash_table (info
);
2564 entry
->next
= eht
->dynlocal
;
2565 eht
->dynlocal
= entry
;
2566 entry
->input_bfd
= input_bfd
;
2567 entry
->input_indx
= input_indx
;
2570 /* Whatever binding the symbol had before, it's now local. */
2572 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2574 /* The dynindx will be set at the end of size_dynamic_sections. */
2579 /* Read and swap the relocs from the section indicated by SHDR. This
2580 may be either a REL or a RELA section. The relocations are
2581 translated into RELA relocations and stored in INTERNAL_RELOCS,
2582 which should have already been allocated to contain enough space.
2583 The EXTERNAL_RELOCS are a buffer where the external form of the
2584 relocations should be stored.
2586 Returns false if something goes wrong. */
2589 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2592 Elf_Internal_Shdr
*shdr
;
2593 PTR external_relocs
;
2594 Elf_Internal_Rela
*internal_relocs
;
2596 struct elf_backend_data
*bed
;
2599 /* If there aren't any relocations, that's OK. */
2603 /* Position ourselves at the start of the section. */
2604 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2607 /* Read the relocations. */
2608 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2611 bed
= get_elf_backend_data (abfd
);
2613 /* Convert the external relocations to the internal format. */
2614 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2616 Elf_External_Rel
*erel
;
2617 Elf_External_Rel
*erelend
;
2618 Elf_Internal_Rela
*irela
;
2619 Elf_Internal_Rel
*irel
;
2621 erel
= (Elf_External_Rel
*) external_relocs
;
2622 erelend
= erel
+ NUM_SHDR_ENTRIES (shdr
);
2623 irela
= internal_relocs
;
2624 amt
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
2625 irel
= bfd_alloc (abfd
, amt
);
2626 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2630 if (bed
->s
->swap_reloc_in
)
2631 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2633 elf_swap_reloc_in (abfd
, erel
, irel
);
2635 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2637 irela
[i
].r_offset
= irel
[i
].r_offset
;
2638 irela
[i
].r_info
= irel
[i
].r_info
;
2639 irela
[i
].r_addend
= 0;
2645 Elf_External_Rela
*erela
;
2646 Elf_External_Rela
*erelaend
;
2647 Elf_Internal_Rela
*irela
;
2649 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2651 erela
= (Elf_External_Rela
*) external_relocs
;
2652 erelaend
= erela
+ NUM_SHDR_ENTRIES (shdr
);
2653 irela
= internal_relocs
;
2654 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2656 if (bed
->s
->swap_reloca_in
)
2657 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2659 elf_swap_reloca_in (abfd
, erela
, irela
);
2666 /* Read and swap the relocs for a section O. They may have been
2667 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2668 not NULL, they are used as buffers to read into. They are known to
2669 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2670 the return value is allocated using either malloc or bfd_alloc,
2671 according to the KEEP_MEMORY argument. If O has two relocation
2672 sections (both REL and RELA relocations), then the REL_HDR
2673 relocations will appear first in INTERNAL_RELOCS, followed by the
2674 REL_HDR2 relocations. */
2677 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2681 PTR external_relocs
;
2682 Elf_Internal_Rela
*internal_relocs
;
2683 boolean keep_memory
;
2685 Elf_Internal_Shdr
*rel_hdr
;
2687 Elf_Internal_Rela
*alloc2
= NULL
;
2688 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2690 if (elf_section_data (o
)->relocs
!= NULL
)
2691 return elf_section_data (o
)->relocs
;
2693 if (o
->reloc_count
== 0)
2696 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2698 if (internal_relocs
== NULL
)
2702 size
= o
->reloc_count
;
2703 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2705 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2707 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2708 if (internal_relocs
== NULL
)
2712 if (external_relocs
== NULL
)
2714 bfd_size_type size
= rel_hdr
->sh_size
;
2716 if (elf_section_data (o
)->rel_hdr2
)
2717 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
2718 alloc1
= (PTR
) bfd_malloc (size
);
2721 external_relocs
= alloc1
;
2724 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2728 if (!elf_link_read_relocs_from_section
2730 elf_section_data (o
)->rel_hdr2
,
2731 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2732 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
2733 * bed
->s
->int_rels_per_ext_rel
)))
2736 /* Cache the results for next time, if we can. */
2738 elf_section_data (o
)->relocs
= internal_relocs
;
2743 /* Don't free alloc2, since if it was allocated we are passing it
2744 back (under the name of internal_relocs). */
2746 return internal_relocs
;
2756 /* Record an assignment to a symbol made by a linker script. We need
2757 this in case some dynamic object refers to this symbol. */
2760 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2761 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2762 struct bfd_link_info
*info
;
2766 struct elf_link_hash_entry
*h
;
2768 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2771 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2775 if (h
->root
.type
== bfd_link_hash_new
)
2776 h
->elf_link_hash_flags
&= ~ELF_LINK_NON_ELF
;
2778 /* If this symbol is being provided by the linker script, and it is
2779 currently defined by a dynamic object, but not by a regular
2780 object, then mark it as undefined so that the generic linker will
2781 force the correct value. */
2783 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2784 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2785 h
->root
.type
= bfd_link_hash_undefined
;
2787 /* If this symbol is not being provided by the linker script, and it is
2788 currently defined by a dynamic object, but not by a regular object,
2789 then clear out any version information because the symbol will not be
2790 associated with the dynamic object any more. */
2792 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2793 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2794 h
->verinfo
.verdef
= NULL
;
2796 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2798 /* When possible, keep the original type of the symbol. */
2799 if (h
->type
== STT_NOTYPE
)
2800 h
->type
= STT_OBJECT
;
2802 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2803 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2805 && h
->dynindx
== -1)
2807 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2810 /* If this is a weak defined symbol, and we know a corresponding
2811 real symbol from the same dynamic object, make sure the real
2812 symbol is also made into a dynamic symbol. */
2813 if (h
->weakdef
!= NULL
2814 && h
->weakdef
->dynindx
== -1)
2816 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2824 /* This structure is used to pass information to
2825 elf_link_assign_sym_version. */
2827 struct elf_assign_sym_version_info
2831 /* General link information. */
2832 struct bfd_link_info
*info
;
2834 struct bfd_elf_version_tree
*verdefs
;
2835 /* Whether we had a failure. */
2839 /* This structure is used to pass information to
2840 elf_link_find_version_dependencies. */
2842 struct elf_find_verdep_info
2846 /* General link information. */
2847 struct bfd_link_info
*info
;
2848 /* The number of dependencies. */
2850 /* Whether we had a failure. */
2854 /* Array used to determine the number of hash table buckets to use
2855 based on the number of symbols there are. If there are fewer than
2856 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2857 fewer than 37 we use 17 buckets, and so forth. We never use more
2858 than 32771 buckets. */
2860 static const size_t elf_buckets
[] =
2862 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2866 /* Compute bucket count for hashing table. We do not use a static set
2867 of possible tables sizes anymore. Instead we determine for all
2868 possible reasonable sizes of the table the outcome (i.e., the
2869 number of collisions etc) and choose the best solution. The
2870 weighting functions are not too simple to allow the table to grow
2871 without bounds. Instead one of the weighting factors is the size.
2872 Therefore the result is always a good payoff between few collisions
2873 (= short chain lengths) and table size. */
2875 compute_bucket_count (info
)
2876 struct bfd_link_info
*info
;
2878 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2879 size_t best_size
= 0;
2880 unsigned long int *hashcodes
;
2881 unsigned long int *hashcodesp
;
2882 unsigned long int i
;
2885 /* Compute the hash values for all exported symbols. At the same
2886 time store the values in an array so that we could use them for
2889 amt
*= sizeof (unsigned long int);
2890 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
2891 if (hashcodes
== NULL
)
2893 hashcodesp
= hashcodes
;
2895 /* Put all hash values in HASHCODES. */
2896 elf_link_hash_traverse (elf_hash_table (info
),
2897 elf_collect_hash_codes
, &hashcodesp
);
2899 /* We have a problem here. The following code to optimize the table
2900 size requires an integer type with more the 32 bits. If
2901 BFD_HOST_U_64_BIT is set we know about such a type. */
2902 #ifdef BFD_HOST_U_64_BIT
2903 if (info
->optimize
== true)
2905 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2908 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2909 unsigned long int *counts
;
2911 /* Possible optimization parameters: if we have NSYMS symbols we say
2912 that the hashing table must at least have NSYMS/4 and at most
2914 minsize
= nsyms
/ 4;
2917 best_size
= maxsize
= nsyms
* 2;
2919 /* Create array where we count the collisions in. We must use bfd_malloc
2920 since the size could be large. */
2922 amt
*= sizeof (unsigned long int);
2923 counts
= (unsigned long int *) bfd_malloc (amt
);
2930 /* Compute the "optimal" size for the hash table. The criteria is a
2931 minimal chain length. The minor criteria is (of course) the size
2933 for (i
= minsize
; i
< maxsize
; ++i
)
2935 /* Walk through the array of hashcodes and count the collisions. */
2936 BFD_HOST_U_64_BIT max
;
2937 unsigned long int j
;
2938 unsigned long int fact
;
2940 memset (counts
, '\0', i
* sizeof (unsigned long int));
2942 /* Determine how often each hash bucket is used. */
2943 for (j
= 0; j
< nsyms
; ++j
)
2944 ++counts
[hashcodes
[j
] % i
];
2946 /* For the weight function we need some information about the
2947 pagesize on the target. This is information need not be 100%
2948 accurate. Since this information is not available (so far) we
2949 define it here to a reasonable default value. If it is crucial
2950 to have a better value some day simply define this value. */
2951 # ifndef BFD_TARGET_PAGESIZE
2952 # define BFD_TARGET_PAGESIZE (4096)
2955 /* We in any case need 2 + NSYMS entries for the size values and
2957 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2960 /* Variant 1: optimize for short chains. We add the squares
2961 of all the chain lengths (which favous many small chain
2962 over a few long chains). */
2963 for (j
= 0; j
< i
; ++j
)
2964 max
+= counts
[j
] * counts
[j
];
2966 /* This adds penalties for the overall size of the table. */
2967 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2970 /* Variant 2: Optimize a lot more for small table. Here we
2971 also add squares of the size but we also add penalties for
2972 empty slots (the +1 term). */
2973 for (j
= 0; j
< i
; ++j
)
2974 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2976 /* The overall size of the table is considered, but not as
2977 strong as in variant 1, where it is squared. */
2978 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2982 /* Compare with current best results. */
2983 if (max
< best_chlen
)
2993 #endif /* defined (BFD_HOST_U_64_BIT) */
2995 /* This is the fallback solution if no 64bit type is available or if we
2996 are not supposed to spend much time on optimizations. We select the
2997 bucket count using a fixed set of numbers. */
2998 for (i
= 0; elf_buckets
[i
] != 0; i
++)
3000 best_size
= elf_buckets
[i
];
3001 if (dynsymcount
< elf_buckets
[i
+ 1])
3006 /* Free the arrays we needed. */
3012 /* Set up the sizes and contents of the ELF dynamic sections. This is
3013 called by the ELF linker emulation before_allocation routine. We
3014 must set the sizes of the sections before the linker sets the
3015 addresses of the various sections. */
3018 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
3020 auxiliary_filters
, info
, sinterpptr
,
3025 const char *filter_shlib
;
3026 const char * const *auxiliary_filters
;
3027 struct bfd_link_info
*info
;
3028 asection
**sinterpptr
;
3029 struct bfd_elf_version_tree
*verdefs
;
3031 bfd_size_type soname_indx
;
3033 struct elf_backend_data
*bed
;
3034 struct elf_assign_sym_version_info asvinfo
;
3038 soname_indx
= (bfd_size_type
) -1;
3040 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
3043 if (! is_elf_hash_table (info
))
3046 /* Any syms created from now on start with -1 in
3047 got.refcount/offset and plt.refcount/offset. */
3048 elf_hash_table (info
)->init_refcount
= -1;
3050 /* The backend may have to create some sections regardless of whether
3051 we're dynamic or not. */
3052 bed
= get_elf_backend_data (output_bfd
);
3053 if (bed
->elf_backend_always_size_sections
3054 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
3057 dynobj
= elf_hash_table (info
)->dynobj
;
3059 /* If there were no dynamic objects in the link, there is nothing to
3064 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
3067 if (elf_hash_table (info
)->dynamic_sections_created
)
3069 struct elf_info_failed eif
;
3070 struct elf_link_hash_entry
*h
;
3073 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
3074 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
3078 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3080 if (soname_indx
== (bfd_size_type
) -1
3081 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SONAME
,
3088 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMBOLIC
,
3091 info
->flags
|= DF_SYMBOLIC
;
3098 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
3100 if (info
->new_dtags
)
3101 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
3102 if (indx
== (bfd_size_type
) -1
3103 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_RPATH
, indx
)
3105 && ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_RUNPATH
,
3110 if (filter_shlib
!= NULL
)
3114 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3115 filter_shlib
, true);
3116 if (indx
== (bfd_size_type
) -1
3117 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FILTER
, indx
))
3121 if (auxiliary_filters
!= NULL
)
3123 const char * const *p
;
3125 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
3129 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3131 if (indx
== (bfd_size_type
) -1
3132 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_AUXILIARY
,
3139 eif
.verdefs
= verdefs
;
3142 /* If we are supposed to export all symbols into the dynamic symbol
3143 table (this is not the normal case), then do so. */
3144 if (info
->export_dynamic
)
3146 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
3152 /* Attach all the symbols to their version information. */
3153 asvinfo
.output_bfd
= output_bfd
;
3154 asvinfo
.info
= info
;
3155 asvinfo
.verdefs
= verdefs
;
3156 asvinfo
.failed
= false;
3158 elf_link_hash_traverse (elf_hash_table (info
),
3159 elf_link_assign_sym_version
,
3164 /* Find all symbols which were defined in a dynamic object and make
3165 the backend pick a reasonable value for them. */
3166 elf_link_hash_traverse (elf_hash_table (info
),
3167 elf_adjust_dynamic_symbol
,
3172 /* Add some entries to the .dynamic section. We fill in some of the
3173 values later, in elf_bfd_final_link, but we must add the entries
3174 now so that we know the final size of the .dynamic section. */
3176 /* If there are initialization and/or finalization functions to
3177 call then add the corresponding DT_INIT/DT_FINI entries. */
3178 h
= (info
->init_function
3179 ? elf_link_hash_lookup (elf_hash_table (info
),
3180 info
->init_function
, false,
3184 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3185 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3187 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT
, (bfd_vma
) 0))
3190 h
= (info
->fini_function
3191 ? elf_link_hash_lookup (elf_hash_table (info
),
3192 info
->fini_function
, false,
3196 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
3197 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
3199 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI
, (bfd_vma
) 0))
3203 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
3204 /* If .dynstr is excluded from the link, we don't want any of
3205 these tags. Strictly, we should be checking each section
3206 individually; This quick check covers for the case where
3207 someone does a /DISCARD/ : { *(*) }. */
3208 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
3210 bfd_size_type strsize
;
3212 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3213 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_HASH
, (bfd_vma
) 0)
3214 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRTAB
, (bfd_vma
) 0)
3215 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMTAB
, (bfd_vma
) 0)
3216 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRSZ
, strsize
)
3217 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMENT
,
3218 (bfd_vma
) sizeof (Elf_External_Sym
)))
3223 /* The backend must work out the sizes of all the other dynamic
3225 if (bed
->elf_backend_size_dynamic_sections
3226 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
3229 if (elf_hash_table (info
)->dynamic_sections_created
)
3231 bfd_size_type dynsymcount
;
3233 size_t bucketcount
= 0;
3234 size_t hash_entry_size
;
3235 unsigned int dtagcount
;
3237 /* Set up the version definition section. */
3238 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3239 BFD_ASSERT (s
!= NULL
);
3241 /* We may have created additional version definitions if we are
3242 just linking a regular application. */
3243 verdefs
= asvinfo
.verdefs
;
3245 /* Skip anonymous version tag. */
3246 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
3247 verdefs
= verdefs
->next
;
3249 if (verdefs
== NULL
)
3250 _bfd_strip_section_from_output (info
, s
);
3255 struct bfd_elf_version_tree
*t
;
3257 Elf_Internal_Verdef def
;
3258 Elf_Internal_Verdaux defaux
;
3263 /* Make space for the base version. */
3264 size
+= sizeof (Elf_External_Verdef
);
3265 size
+= sizeof (Elf_External_Verdaux
);
3268 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3270 struct bfd_elf_version_deps
*n
;
3272 size
+= sizeof (Elf_External_Verdef
);
3273 size
+= sizeof (Elf_External_Verdaux
);
3276 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3277 size
+= sizeof (Elf_External_Verdaux
);
3280 s
->_raw_size
= size
;
3281 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3282 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3285 /* Fill in the version definition section. */
3289 def
.vd_version
= VER_DEF_CURRENT
;
3290 def
.vd_flags
= VER_FLG_BASE
;
3293 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3294 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3295 + sizeof (Elf_External_Verdaux
));
3297 if (soname_indx
!= (bfd_size_type
) -1)
3299 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3301 def
.vd_hash
= bfd_elf_hash (soname
);
3302 defaux
.vda_name
= soname_indx
;
3309 name
= basename (output_bfd
->filename
);
3310 def
.vd_hash
= bfd_elf_hash (name
);
3311 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3313 if (indx
== (bfd_size_type
) -1)
3315 defaux
.vda_name
= indx
;
3317 defaux
.vda_next
= 0;
3319 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3320 (Elf_External_Verdef
*) p
);
3321 p
+= sizeof (Elf_External_Verdef
);
3322 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3323 (Elf_External_Verdaux
*) p
);
3324 p
+= sizeof (Elf_External_Verdaux
);
3326 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3329 struct bfd_elf_version_deps
*n
;
3330 struct elf_link_hash_entry
*h
;
3333 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3336 /* Add a symbol representing this version. */
3338 if (! (_bfd_generic_link_add_one_symbol
3339 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3340 (bfd_vma
) 0, (const char *) NULL
, false,
3341 get_elf_backend_data (dynobj
)->collect
,
3342 (struct bfd_link_hash_entry
**) &h
)))
3344 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3345 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3346 h
->type
= STT_OBJECT
;
3347 h
->verinfo
.vertree
= t
;
3349 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3352 def
.vd_version
= VER_DEF_CURRENT
;
3354 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3355 def
.vd_flags
|= VER_FLG_WEAK
;
3356 def
.vd_ndx
= t
->vernum
+ 1;
3357 def
.vd_cnt
= cdeps
+ 1;
3358 def
.vd_hash
= bfd_elf_hash (t
->name
);
3359 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3360 if (t
->next
!= NULL
)
3361 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3362 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3366 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3367 (Elf_External_Verdef
*) p
);
3368 p
+= sizeof (Elf_External_Verdef
);
3370 defaux
.vda_name
= h
->dynstr_index
;
3371 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3373 if (t
->deps
== NULL
)
3374 defaux
.vda_next
= 0;
3376 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3377 t
->name_indx
= defaux
.vda_name
;
3379 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3380 (Elf_External_Verdaux
*) p
);
3381 p
+= sizeof (Elf_External_Verdaux
);
3383 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3385 if (n
->version_needed
== NULL
)
3387 /* This can happen if there was an error in the
3389 defaux
.vda_name
= 0;
3393 defaux
.vda_name
= n
->version_needed
->name_indx
;
3394 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3397 if (n
->next
== NULL
)
3398 defaux
.vda_next
= 0;
3400 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3402 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3403 (Elf_External_Verdaux
*) p
);
3404 p
+= sizeof (Elf_External_Verdaux
);
3408 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEF
, (bfd_vma
) 0)
3409 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEFNUM
,
3413 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3416 if (info
->new_dtags
&& info
->flags
)
3418 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS
, info
->flags
))
3425 info
->flags_1
&= ~ (DF_1_INITFIRST
3428 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS_1
,
3433 /* Work out the size of the version reference section. */
3435 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3436 BFD_ASSERT (s
!= NULL
);
3438 struct elf_find_verdep_info sinfo
;
3440 sinfo
.output_bfd
= output_bfd
;
3442 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3443 if (sinfo
.vers
== 0)
3445 sinfo
.failed
= false;
3447 elf_link_hash_traverse (elf_hash_table (info
),
3448 elf_link_find_version_dependencies
,
3451 if (elf_tdata (output_bfd
)->verref
== NULL
)
3452 _bfd_strip_section_from_output (info
, s
);
3455 Elf_Internal_Verneed
*t
;
3460 /* Build the version definition section. */
3463 for (t
= elf_tdata (output_bfd
)->verref
;
3467 Elf_Internal_Vernaux
*a
;
3469 size
+= sizeof (Elf_External_Verneed
);
3471 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3472 size
+= sizeof (Elf_External_Vernaux
);
3475 s
->_raw_size
= size
;
3476 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3477 if (s
->contents
== NULL
)
3481 for (t
= elf_tdata (output_bfd
)->verref
;
3486 Elf_Internal_Vernaux
*a
;
3490 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3493 t
->vn_version
= VER_NEED_CURRENT
;
3495 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3496 elf_dt_name (t
->vn_bfd
) != NULL
3497 ? elf_dt_name (t
->vn_bfd
)
3498 : basename (t
->vn_bfd
->filename
),
3500 if (indx
== (bfd_size_type
) -1)
3503 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3504 if (t
->vn_nextref
== NULL
)
3507 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3508 + caux
* sizeof (Elf_External_Vernaux
));
3510 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3511 (Elf_External_Verneed
*) p
);
3512 p
+= sizeof (Elf_External_Verneed
);
3514 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3516 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3517 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3518 a
->vna_nodename
, false);
3519 if (indx
== (bfd_size_type
) -1)
3522 if (a
->vna_nextptr
== NULL
)
3525 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3527 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3528 (Elf_External_Vernaux
*) p
);
3529 p
+= sizeof (Elf_External_Vernaux
);
3533 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEED
,
3535 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEEDNUM
,
3539 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3543 /* Assign dynsym indicies. In a shared library we generate a
3544 section symbol for each output section, which come first.
3545 Next come all of the back-end allocated local dynamic syms,
3546 followed by the rest of the global symbols. */
3548 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3550 /* Work out the size of the symbol version section. */
3551 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3552 BFD_ASSERT (s
!= NULL
);
3553 if (dynsymcount
== 0
3554 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3556 _bfd_strip_section_from_output (info
, s
);
3557 /* The DYNSYMCOUNT might have changed if we were going to
3558 output a dynamic symbol table entry for S. */
3559 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3563 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3564 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3565 if (s
->contents
== NULL
)
3568 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERSYM
, (bfd_vma
) 0))
3572 /* Set the size of the .dynsym and .hash sections. We counted
3573 the number of dynamic symbols in elf_link_add_object_symbols.
3574 We will build the contents of .dynsym and .hash when we build
3575 the final symbol table, because until then we do not know the
3576 correct value to give the symbols. We built the .dynstr
3577 section as we went along in elf_link_add_object_symbols. */
3578 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3579 BFD_ASSERT (s
!= NULL
);
3580 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3581 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3582 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3585 if (dynsymcount
!= 0)
3587 Elf_Internal_Sym isym
;
3589 /* The first entry in .dynsym is a dummy symbol. */
3596 elf_swap_symbol_out (output_bfd
, &isym
, (PTR
) s
->contents
, (PTR
) 0);
3599 /* Compute the size of the hashing table. As a side effect this
3600 computes the hash values for all the names we export. */
3601 bucketcount
= compute_bucket_count (info
);
3603 s
= bfd_get_section_by_name (dynobj
, ".hash");
3604 BFD_ASSERT (s
!= NULL
);
3605 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3606 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3607 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3608 if (s
->contents
== NULL
)
3610 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3612 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) bucketcount
,
3614 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) dynsymcount
,
3615 s
->contents
+ hash_entry_size
);
3617 elf_hash_table (info
)->bucketcount
= bucketcount
;
3619 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3620 BFD_ASSERT (s
!= NULL
);
3622 elf_finalize_dynstr (output_bfd
, info
);
3624 s
->_raw_size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3626 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
3627 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NULL
, (bfd_vma
) 0))
3634 /* This function is used to adjust offsets into .dynstr for
3635 dynamic symbols. This is called via elf_link_hash_traverse. */
3637 static boolean elf_adjust_dynstr_offsets
3638 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3641 elf_adjust_dynstr_offsets (h
, data
)
3642 struct elf_link_hash_entry
*h
;
3645 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3647 if (h
->dynindx
!= -1)
3648 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3652 /* Assign string offsets in .dynstr, update all structures referencing
3656 elf_finalize_dynstr (output_bfd
, info
)
3658 struct bfd_link_info
*info
;
3660 struct elf_link_local_dynamic_entry
*entry
;
3661 struct elf_strtab_hash
*dynstr
= elf_hash_table (info
)->dynstr
;
3662 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
3665 Elf_External_Dyn
*dyncon
, *dynconend
;
3667 _bfd_elf_strtab_finalize (dynstr
);
3668 size
= _bfd_elf_strtab_size (dynstr
);
3670 /* Update all .dynamic entries referencing .dynstr strings. */
3671 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3672 BFD_ASSERT (sdyn
!= NULL
);
3674 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
3675 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
3677 for (; dyncon
< dynconend
; dyncon
++)
3679 Elf_Internal_Dyn dyn
;
3681 elf_swap_dyn_in (dynobj
, dyncon
, & dyn
);
3685 dyn
.d_un
.d_val
= size
;
3686 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3694 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3695 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3702 /* Now update local dynamic symbols. */
3703 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
3704 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3705 entry
->isym
.st_name
);
3707 /* And the rest of dynamic symbols. */
3708 elf_link_hash_traverse (elf_hash_table (info
),
3709 elf_adjust_dynstr_offsets
, dynstr
);
3711 /* Adjust version definitions. */
3712 if (elf_tdata (output_bfd
)->cverdefs
)
3717 Elf_Internal_Verdef def
;
3718 Elf_Internal_Verdaux defaux
;
3720 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3721 p
= (bfd_byte
*) s
->contents
;
3724 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3726 p
+= sizeof (Elf_External_Verdef
);
3727 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3729 _bfd_elf_swap_verdaux_in (output_bfd
,
3730 (Elf_External_Verdaux
*) p
, &defaux
);
3731 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3733 _bfd_elf_swap_verdaux_out (output_bfd
,
3734 &defaux
, (Elf_External_Verdaux
*) p
);
3735 p
+= sizeof (Elf_External_Verdaux
);
3738 while (def
.vd_next
);
3741 /* Adjust version references. */
3742 if (elf_tdata (output_bfd
)->verref
)
3747 Elf_Internal_Verneed need
;
3748 Elf_Internal_Vernaux needaux
;
3750 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3751 p
= (bfd_byte
*) s
->contents
;
3754 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3756 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3757 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3758 (Elf_External_Verneed
*) p
);
3759 p
+= sizeof (Elf_External_Verneed
);
3760 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3762 _bfd_elf_swap_vernaux_in (output_bfd
,
3763 (Elf_External_Vernaux
*) p
, &needaux
);
3764 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3766 _bfd_elf_swap_vernaux_out (output_bfd
,
3768 (Elf_External_Vernaux
*) p
);
3769 p
+= sizeof (Elf_External_Vernaux
);
3772 while (need
.vn_next
);
3778 /* Fix up the flags for a symbol. This handles various cases which
3779 can only be fixed after all the input files are seen. This is
3780 currently called by both adjust_dynamic_symbol and
3781 assign_sym_version, which is unnecessary but perhaps more robust in
3782 the face of future changes. */
3785 elf_fix_symbol_flags (h
, eif
)
3786 struct elf_link_hash_entry
*h
;
3787 struct elf_info_failed
*eif
;
3789 /* If this symbol was mentioned in a non-ELF file, try to set
3790 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3791 permit a non-ELF file to correctly refer to a symbol defined in
3792 an ELF dynamic object. */
3793 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3795 while (h
->root
.type
== bfd_link_hash_indirect
)
3796 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3798 if (h
->root
.type
!= bfd_link_hash_defined
3799 && h
->root
.type
!= bfd_link_hash_defweak
)
3800 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3801 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3804 if (h
->root
.u
.def
.section
->owner
!= NULL
3805 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3806 == bfd_target_elf_flavour
))
3807 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3808 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3810 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3813 if (h
->dynindx
== -1
3814 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3815 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3817 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3826 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3827 was first seen in a non-ELF file. Fortunately, if the symbol
3828 was first seen in an ELF file, we're probably OK unless the
3829 symbol was defined in a non-ELF file. Catch that case here.
3830 FIXME: We're still in trouble if the symbol was first seen in
3831 a dynamic object, and then later in a non-ELF regular object. */
3832 if ((h
->root
.type
== bfd_link_hash_defined
3833 || h
->root
.type
== bfd_link_hash_defweak
)
3834 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3835 && (h
->root
.u
.def
.section
->owner
!= NULL
3836 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3837 != bfd_target_elf_flavour
)
3838 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3839 && (h
->elf_link_hash_flags
3840 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3841 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3844 /* If this is a final link, and the symbol was defined as a common
3845 symbol in a regular object file, and there was no definition in
3846 any dynamic object, then the linker will have allocated space for
3847 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3848 flag will not have been set. */
3849 if (h
->root
.type
== bfd_link_hash_defined
3850 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3851 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3852 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3853 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3854 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3856 /* If -Bsymbolic was used (which means to bind references to global
3857 symbols to the definition within the shared object), and this
3858 symbol was defined in a regular object, then it actually doesn't
3859 need a PLT entry, and we can accomplish that by forcing it local.
3860 Likewise, if the symbol has hidden or internal visibility.
3861 FIXME: It might be that we also do not need a PLT for other
3862 non-hidden visibilities, but we would have to tell that to the
3863 backend specifically; we can't just clear PLT-related data here. */
3864 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3865 && eif
->info
->shared
3866 && is_elf_hash_table (eif
->info
)
3867 && (eif
->info
->symbolic
3868 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3869 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
3870 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3872 struct elf_backend_data
*bed
;
3873 boolean force_local
;
3875 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3877 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3878 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
3879 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
3882 /* If this is a weak defined symbol in a dynamic object, and we know
3883 the real definition in the dynamic object, copy interesting flags
3884 over to the real definition. */
3885 if (h
->weakdef
!= NULL
)
3887 struct elf_link_hash_entry
*weakdef
;
3889 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3890 || h
->root
.type
== bfd_link_hash_defweak
);
3891 weakdef
= h
->weakdef
;
3892 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3893 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3894 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3896 /* If the real definition is defined by a regular object file,
3897 don't do anything special. See the longer description in
3898 elf_adjust_dynamic_symbol, below. */
3899 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3903 struct elf_backend_data
*bed
;
3905 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3906 (*bed
->elf_backend_copy_indirect_symbol
) (weakdef
, h
);
3913 /* Make the backend pick a good value for a dynamic symbol. This is
3914 called via elf_link_hash_traverse, and also calls itself
3918 elf_adjust_dynamic_symbol (h
, data
)
3919 struct elf_link_hash_entry
*h
;
3922 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3924 struct elf_backend_data
*bed
;
3926 /* Ignore indirect symbols. These are added by the versioning code. */
3927 if (h
->root
.type
== bfd_link_hash_indirect
)
3930 if (! is_elf_hash_table (eif
->info
))
3933 /* Fix the symbol flags. */
3934 if (! elf_fix_symbol_flags (h
, eif
))
3937 /* If this symbol does not require a PLT entry, and it is not
3938 defined by a dynamic object, or is not referenced by a regular
3939 object, ignore it. We do have to handle a weak defined symbol,
3940 even if no regular object refers to it, if we decided to add it
3941 to the dynamic symbol table. FIXME: Do we normally need to worry
3942 about symbols which are defined by one dynamic object and
3943 referenced by another one? */
3944 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3945 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3946 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3947 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3948 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3950 h
->plt
.offset
= (bfd_vma
) -1;
3954 /* If we've already adjusted this symbol, don't do it again. This
3955 can happen via a recursive call. */
3956 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3959 /* Don't look at this symbol again. Note that we must set this
3960 after checking the above conditions, because we may look at a
3961 symbol once, decide not to do anything, and then get called
3962 recursively later after REF_REGULAR is set below. */
3963 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3965 /* If this is a weak definition, and we know a real definition, and
3966 the real symbol is not itself defined by a regular object file,
3967 then get a good value for the real definition. We handle the
3968 real symbol first, for the convenience of the backend routine.
3970 Note that there is a confusing case here. If the real definition
3971 is defined by a regular object file, we don't get the real symbol
3972 from the dynamic object, but we do get the weak symbol. If the
3973 processor backend uses a COPY reloc, then if some routine in the
3974 dynamic object changes the real symbol, we will not see that
3975 change in the corresponding weak symbol. This is the way other
3976 ELF linkers work as well, and seems to be a result of the shared
3979 I will clarify this issue. Most SVR4 shared libraries define the
3980 variable _timezone and define timezone as a weak synonym. The
3981 tzset call changes _timezone. If you write
3982 extern int timezone;
3984 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3985 you might expect that, since timezone is a synonym for _timezone,
3986 the same number will print both times. However, if the processor
3987 backend uses a COPY reloc, then actually timezone will be copied
3988 into your process image, and, since you define _timezone
3989 yourself, _timezone will not. Thus timezone and _timezone will
3990 wind up at different memory locations. The tzset call will set
3991 _timezone, leaving timezone unchanged. */
3993 if (h
->weakdef
!= NULL
)
3995 /* If we get to this point, we know there is an implicit
3996 reference by a regular object file via the weak symbol H.
3997 FIXME: Is this really true? What if the traversal finds
3998 H->WEAKDEF before it finds H? */
3999 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
4001 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
4005 /* If a symbol has no type and no size and does not require a PLT
4006 entry, then we are probably about to do the wrong thing here: we
4007 are probably going to create a COPY reloc for an empty object.
4008 This case can arise when a shared object is built with assembly
4009 code, and the assembly code fails to set the symbol type. */
4011 && h
->type
== STT_NOTYPE
4012 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
4013 (*_bfd_error_handler
)
4014 (_("warning: type and size of dynamic symbol `%s' are not defined"),
4015 h
->root
.root
.string
);
4017 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
4018 bed
= get_elf_backend_data (dynobj
);
4019 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
4028 /* This routine is used to export all defined symbols into the dynamic
4029 symbol table. It is called via elf_link_hash_traverse. */
4032 elf_export_symbol (h
, data
)
4033 struct elf_link_hash_entry
*h
;
4036 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
4038 /* Ignore indirect symbols. These are added by the versioning code. */
4039 if (h
->root
.type
== bfd_link_hash_indirect
)
4042 if (h
->dynindx
== -1
4043 && (h
->elf_link_hash_flags
4044 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
4046 struct bfd_elf_version_tree
*t
;
4047 struct bfd_elf_version_expr
*d
;
4049 for (t
= eif
->verdefs
; t
!= NULL
; t
= t
->next
)
4051 if (t
->globals
!= NULL
)
4053 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4055 if ((*d
->match
) (d
, h
->root
.root
.string
))
4060 if (t
->locals
!= NULL
)
4062 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4064 if ((*d
->match
) (d
, h
->root
.root
.string
))
4073 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
4084 /* Look through the symbols which are defined in other shared
4085 libraries and referenced here. Update the list of version
4086 dependencies. This will be put into the .gnu.version_r section.
4087 This function is called via elf_link_hash_traverse. */
4090 elf_link_find_version_dependencies (h
, data
)
4091 struct elf_link_hash_entry
*h
;
4094 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
4095 Elf_Internal_Verneed
*t
;
4096 Elf_Internal_Vernaux
*a
;
4099 /* We only care about symbols defined in shared objects with version
4101 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
4102 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
4104 || h
->verinfo
.verdef
== NULL
)
4107 /* See if we already know about this version. */
4108 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
4110 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
4113 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4114 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
4120 /* This is a new version. Add it to tree we are building. */
4125 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4128 rinfo
->failed
= true;
4132 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
4133 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
4134 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
4138 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4140 /* Note that we are copying a string pointer here, and testing it
4141 above. If bfd_elf_string_from_elf_section is ever changed to
4142 discard the string data when low in memory, this will have to be
4144 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
4146 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
4147 a
->vna_nextptr
= t
->vn_auxptr
;
4149 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
4152 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4159 /* Figure out appropriate versions for all the symbols. We may not
4160 have the version number script until we have read all of the input
4161 files, so until that point we don't know which symbols should be
4162 local. This function is called via elf_link_hash_traverse. */
4165 elf_link_assign_sym_version (h
, data
)
4166 struct elf_link_hash_entry
*h
;
4169 struct elf_assign_sym_version_info
*sinfo
;
4170 struct bfd_link_info
*info
;
4171 struct elf_backend_data
*bed
;
4172 struct elf_info_failed eif
;
4176 sinfo
= (struct elf_assign_sym_version_info
*) data
;
4179 /* Fix the symbol flags. */
4182 if (! elf_fix_symbol_flags (h
, &eif
))
4185 sinfo
->failed
= true;
4189 /* We only need version numbers for symbols defined in regular
4191 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4194 bed
= get_elf_backend_data (sinfo
->output_bfd
);
4195 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4196 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4198 struct bfd_elf_version_tree
*t
;
4203 /* There are two consecutive ELF_VER_CHR characters if this is
4204 not a hidden symbol. */
4206 if (*p
== ELF_VER_CHR
)
4212 /* If there is no version string, we can just return out. */
4216 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4220 /* Look for the version. If we find it, it is no longer weak. */
4221 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4223 if (strcmp (t
->name
, p
) == 0)
4227 struct bfd_elf_version_expr
*d
;
4229 len
= p
- h
->root
.root
.string
;
4230 alc
= bfd_malloc ((bfd_size_type
) len
);
4233 strncpy (alc
, h
->root
.root
.string
, len
- 1);
4234 alc
[len
- 1] = '\0';
4235 if (alc
[len
- 2] == ELF_VER_CHR
)
4236 alc
[len
- 2] = '\0';
4238 h
->verinfo
.vertree
= t
;
4242 if (t
->globals
!= NULL
)
4244 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4245 if ((*d
->match
) (d
, alc
))
4249 /* See if there is anything to force this symbol to
4251 if (d
== NULL
&& t
->locals
!= NULL
)
4253 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4255 if ((*d
->match
) (d
, alc
))
4257 if (h
->dynindx
!= -1
4259 && ! info
->export_dynamic
)
4261 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4274 /* If we are building an application, we need to create a
4275 version node for this version. */
4276 if (t
== NULL
&& ! info
->shared
)
4278 struct bfd_elf_version_tree
**pp
;
4281 /* If we aren't going to export this symbol, we don't need
4282 to worry about it. */
4283 if (h
->dynindx
== -1)
4287 t
= ((struct bfd_elf_version_tree
*)
4288 bfd_alloc (sinfo
->output_bfd
, amt
));
4291 sinfo
->failed
= true;
4300 t
->name_indx
= (unsigned int) -1;
4304 /* Don't count anonymous version tag. */
4305 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
4307 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
4309 t
->vernum
= version_index
;
4313 h
->verinfo
.vertree
= t
;
4317 /* We could not find the version for a symbol when
4318 generating a shared archive. Return an error. */
4319 (*_bfd_error_handler
)
4320 (_("%s: undefined versioned symbol name %s"),
4321 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
4322 bfd_set_error (bfd_error_bad_value
);
4323 sinfo
->failed
= true;
4328 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4331 /* If we don't have a version for this symbol, see if we can find
4333 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
4335 struct bfd_elf_version_tree
*t
;
4336 struct bfd_elf_version_tree
*deflt
;
4337 struct bfd_elf_version_expr
*d
;
4339 /* See if can find what version this symbol is in. If the
4340 symbol is supposed to be local, then don't actually register
4343 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4345 if (t
->globals
!= NULL
)
4347 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4349 if ((*d
->match
) (d
, h
->root
.root
.string
))
4351 h
->verinfo
.vertree
= t
;
4360 if (t
->locals
!= NULL
)
4362 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4364 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
4366 else if ((*d
->match
) (d
, h
->root
.root
.string
))
4368 h
->verinfo
.vertree
= t
;
4369 if (h
->dynindx
!= -1
4371 && ! info
->export_dynamic
)
4373 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4384 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4386 h
->verinfo
.vertree
= deflt
;
4387 if (h
->dynindx
!= -1
4389 && ! info
->export_dynamic
)
4391 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4399 /* Final phase of ELF linker. */
4401 /* A structure we use to avoid passing large numbers of arguments. */
4403 struct elf_final_link_info
4405 /* General link information. */
4406 struct bfd_link_info
*info
;
4409 /* Symbol string table. */
4410 struct bfd_strtab_hash
*symstrtab
;
4411 /* .dynsym section. */
4412 asection
*dynsym_sec
;
4413 /* .hash section. */
4415 /* symbol version section (.gnu.version). */
4416 asection
*symver_sec
;
4417 /* Buffer large enough to hold contents of any section. */
4419 /* Buffer large enough to hold external relocs of any section. */
4420 PTR external_relocs
;
4421 /* Buffer large enough to hold internal relocs of any section. */
4422 Elf_Internal_Rela
*internal_relocs
;
4423 /* Buffer large enough to hold external local symbols of any input
4425 Elf_External_Sym
*external_syms
;
4426 /* And a buffer for symbol section indices. */
4427 Elf_External_Sym_Shndx
*locsym_shndx
;
4428 /* Buffer large enough to hold internal local symbols of any input
4430 Elf_Internal_Sym
*internal_syms
;
4431 /* Array large enough to hold a symbol index for each local symbol
4432 of any input BFD. */
4434 /* Array large enough to hold a section pointer for each local
4435 symbol of any input BFD. */
4436 asection
**sections
;
4437 /* Buffer to hold swapped out symbols. */
4438 Elf_External_Sym
*symbuf
;
4439 /* And one for symbol section indices. */
4440 Elf_External_Sym_Shndx
*symshndxbuf
;
4441 /* Number of swapped out symbols in buffer. */
4442 size_t symbuf_count
;
4443 /* Number of symbols which fit in symbuf. */
4447 static boolean elf_link_output_sym
4448 PARAMS ((struct elf_final_link_info
*, const char *,
4449 Elf_Internal_Sym
*, asection
*));
4450 static boolean elf_link_flush_output_syms
4451 PARAMS ((struct elf_final_link_info
*));
4452 static boolean elf_link_output_extsym
4453 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4454 static boolean elf_link_sec_merge_syms
4455 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4456 static boolean elf_link_input_bfd
4457 PARAMS ((struct elf_final_link_info
*, bfd
*));
4458 static boolean elf_reloc_link_order
4459 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
4460 struct bfd_link_order
*));
4462 /* This struct is used to pass information to elf_link_output_extsym. */
4464 struct elf_outext_info
4468 struct elf_final_link_info
*finfo
;
4471 /* Compute the size of, and allocate space for, REL_HDR which is the
4472 section header for a section containing relocations for O. */
4475 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
4477 Elf_Internal_Shdr
*rel_hdr
;
4480 bfd_size_type reloc_count
;
4481 bfd_size_type num_rel_hashes
;
4483 /* Figure out how many relocations there will be. */
4484 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
4485 reloc_count
= elf_section_data (o
)->rel_count
;
4487 reloc_count
= elf_section_data (o
)->rel_count2
;
4489 num_rel_hashes
= o
->reloc_count
;
4490 if (num_rel_hashes
< reloc_count
)
4491 num_rel_hashes
= reloc_count
;
4493 /* That allows us to calculate the size of the section. */
4494 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
4496 /* The contents field must last into write_object_contents, so we
4497 allocate it with bfd_alloc rather than malloc. Also since we
4498 cannot be sure that the contents will actually be filled in,
4499 we zero the allocated space. */
4500 rel_hdr
->contents
= (PTR
) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
4501 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
4504 /* We only allocate one set of hash entries, so we only do it the
4505 first time we are called. */
4506 if (elf_section_data (o
)->rel_hashes
== NULL
4509 struct elf_link_hash_entry
**p
;
4511 p
= ((struct elf_link_hash_entry
**)
4512 bfd_zmalloc (num_rel_hashes
4513 * sizeof (struct elf_link_hash_entry
*)));
4517 elf_section_data (o
)->rel_hashes
= p
;
4523 /* When performing a relocateable link, the input relocations are
4524 preserved. But, if they reference global symbols, the indices
4525 referenced must be updated. Update all the relocations in
4526 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4529 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
4531 Elf_Internal_Shdr
*rel_hdr
;
4533 struct elf_link_hash_entry
**rel_hash
;
4536 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4537 Elf_Internal_Rel
*irel
;
4538 Elf_Internal_Rela
*irela
;
4539 bfd_size_type amt
= sizeof (Elf_Internal_Rel
) * bed
->s
->int_rels_per_ext_rel
;
4541 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (amt
);
4544 (*_bfd_error_handler
) (_("Error: out of memory"));
4548 amt
= sizeof (Elf_Internal_Rela
) * bed
->s
->int_rels_per_ext_rel
;
4549 irela
= (Elf_Internal_Rela
*) bfd_zmalloc (amt
);
4552 (*_bfd_error_handler
) (_("Error: out of memory"));
4556 for (i
= 0; i
< count
; i
++, rel_hash
++)
4558 if (*rel_hash
== NULL
)
4561 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4563 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4565 Elf_External_Rel
*erel
;
4568 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4569 if (bed
->s
->swap_reloc_in
)
4570 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
4572 elf_swap_reloc_in (abfd
, erel
, irel
);
4574 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
4575 irel
[j
].r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4576 ELF_R_TYPE (irel
[j
].r_info
));
4578 if (bed
->s
->swap_reloc_out
)
4579 (*bed
->s
->swap_reloc_out
) (abfd
, irel
, (bfd_byte
*) erel
);
4581 elf_swap_reloc_out (abfd
, irel
, erel
);
4585 Elf_External_Rela
*erela
;
4588 BFD_ASSERT (rel_hdr
->sh_entsize
4589 == sizeof (Elf_External_Rela
));
4591 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4592 if (bed
->s
->swap_reloca_in
)
4593 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
4595 elf_swap_reloca_in (abfd
, erela
, irela
);
4597 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
4598 irela
[j
].r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4599 ELF_R_TYPE (irela
[j
].r_info
));
4601 if (bed
->s
->swap_reloca_out
)
4602 (*bed
->s
->swap_reloca_out
) (abfd
, irela
, (bfd_byte
*) erela
);
4604 elf_swap_reloca_out (abfd
, irela
, erela
);
4612 struct elf_link_sort_rela
{
4614 enum elf_reloc_type_class type
;
4616 Elf_Internal_Rel rel
;
4617 Elf_Internal_Rela rela
;
4622 elf_link_sort_cmp1 (A
, B
)
4626 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4627 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4628 int relativea
, relativeb
;
4630 relativea
= a
->type
== reloc_class_relative
;
4631 relativeb
= b
->type
== reloc_class_relative
;
4633 if (relativea
< relativeb
)
4635 if (relativea
> relativeb
)
4637 if (ELF_R_SYM (a
->u
.rel
.r_info
) < ELF_R_SYM (b
->u
.rel
.r_info
))
4639 if (ELF_R_SYM (a
->u
.rel
.r_info
) > ELF_R_SYM (b
->u
.rel
.r_info
))
4641 if (a
->u
.rel
.r_offset
< b
->u
.rel
.r_offset
)
4643 if (a
->u
.rel
.r_offset
> b
->u
.rel
.r_offset
)
4649 elf_link_sort_cmp2 (A
, B
)
4653 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4654 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4657 if (a
->offset
< b
->offset
)
4659 if (a
->offset
> b
->offset
)
4661 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
4662 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
4667 if (a
->u
.rel
.r_offset
< b
->u
.rel
.r_offset
)
4669 if (a
->u
.rel
.r_offset
> b
->u
.rel
.r_offset
)
4675 elf_link_sort_relocs (abfd
, info
, psec
)
4677 struct bfd_link_info
*info
;
4680 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
4681 asection
*reldyn
, *o
;
4682 boolean rel
= false;
4683 bfd_size_type count
, size
;
4685 struct elf_link_sort_rela
*rela
;
4686 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4688 reldyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
4689 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4691 reldyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
4692 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4695 count
= reldyn
->_raw_size
/ sizeof (Elf_External_Rel
);
4698 count
= reldyn
->_raw_size
/ sizeof (Elf_External_Rela
);
4701 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4702 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4703 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4704 && o
->output_section
== reldyn
)
4705 size
+= o
->_raw_size
;
4707 if (size
!= reldyn
->_raw_size
)
4710 rela
= (struct elf_link_sort_rela
*) bfd_zmalloc (sizeof (*rela
) * count
);
4713 (*info
->callbacks
->warning
)
4714 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0,
4719 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4720 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4721 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4722 && o
->output_section
== reldyn
)
4726 Elf_External_Rel
*erel
, *erelend
;
4727 struct elf_link_sort_rela
*s
;
4729 erel
= (Elf_External_Rel
*) o
->contents
;
4730 erelend
= (Elf_External_Rel
*) (o
->contents
+ o
->_raw_size
);
4731 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rel
);
4732 for (; erel
< erelend
; erel
++, s
++)
4734 if (bed
->s
->swap_reloc_in
)
4735 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, &s
->u
.rel
);
4737 elf_swap_reloc_in (abfd
, erel
, &s
->u
.rel
);
4739 s
->type
= (*bed
->elf_backend_reloc_type_class
) (&s
->u
.rela
);
4744 Elf_External_Rela
*erela
, *erelaend
;
4745 struct elf_link_sort_rela
*s
;
4747 erela
= (Elf_External_Rela
*) o
->contents
;
4748 erelaend
= (Elf_External_Rela
*) (o
->contents
+ o
->_raw_size
);
4749 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rela
);
4750 for (; erela
< erelaend
; erela
++, s
++)
4752 if (bed
->s
->swap_reloca_in
)
4753 (*bed
->s
->swap_reloca_in
) (dynobj
, (bfd_byte
*) erela
,
4756 elf_swap_reloca_in (dynobj
, erela
, &s
->u
.rela
);
4758 s
->type
= (*bed
->elf_backend_reloc_type_class
) (&s
->u
.rela
);
4763 qsort (rela
, (size_t) count
, sizeof (*rela
), elf_link_sort_cmp1
);
4764 for (ret
= 0; ret
< count
&& rela
[ret
].type
== reloc_class_relative
; ret
++)
4766 for (i
= ret
, j
= ret
; i
< count
; i
++)
4768 if (ELF_R_SYM (rela
[i
].u
.rel
.r_info
) != ELF_R_SYM (rela
[j
].u
.rel
.r_info
))
4770 rela
[i
].offset
= rela
[j
].u
.rel
.r_offset
;
4772 qsort (rela
+ ret
, (size_t) count
- ret
, sizeof (*rela
), elf_link_sort_cmp2
);
4774 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4775 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4776 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4777 && o
->output_section
== reldyn
)
4781 Elf_External_Rel
*erel
, *erelend
;
4782 struct elf_link_sort_rela
*s
;
4784 erel
= (Elf_External_Rel
*) o
->contents
;
4785 erelend
= (Elf_External_Rel
*) (o
->contents
+ o
->_raw_size
);
4786 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rel
);
4787 for (; erel
< erelend
; erel
++, s
++)
4789 if (bed
->s
->swap_reloc_out
)
4790 (*bed
->s
->swap_reloc_out
) (abfd
, &s
->u
.rel
,
4793 elf_swap_reloc_out (abfd
, &s
->u
.rel
, erel
);
4798 Elf_External_Rela
*erela
, *erelaend
;
4799 struct elf_link_sort_rela
*s
;
4801 erela
= (Elf_External_Rela
*) o
->contents
;
4802 erelaend
= (Elf_External_Rela
*) (o
->contents
+ o
->_raw_size
);
4803 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rela
);
4804 for (; erela
< erelaend
; erela
++, s
++)
4806 if (bed
->s
->swap_reloca_out
)
4807 (*bed
->s
->swap_reloca_out
) (dynobj
, &s
->u
.rela
,
4808 (bfd_byte
*) erela
);
4810 elf_swap_reloca_out (dynobj
, &s
->u
.rela
, erela
);
4820 /* Do the final step of an ELF link. */
4823 elf_bfd_final_link (abfd
, info
)
4825 struct bfd_link_info
*info
;
4828 boolean emit_relocs
;
4830 struct elf_final_link_info finfo
;
4831 register asection
*o
;
4832 register struct bfd_link_order
*p
;
4834 bfd_size_type max_contents_size
;
4835 bfd_size_type max_external_reloc_size
;
4836 bfd_size_type max_internal_reloc_count
;
4837 bfd_size_type max_sym_count
;
4838 bfd_size_type max_sym_shndx_count
;
4840 Elf_Internal_Sym elfsym
;
4842 Elf_Internal_Shdr
*symtab_hdr
;
4843 Elf_Internal_Shdr
*symstrtab_hdr
;
4844 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4845 struct elf_outext_info eoinfo
;
4847 size_t relativecount
= 0;
4848 asection
*reldyn
= 0;
4851 if (! is_elf_hash_table (info
))
4855 abfd
->flags
|= DYNAMIC
;
4857 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4858 dynobj
= elf_hash_table (info
)->dynobj
;
4860 emit_relocs
= (info
->relocateable
4861 || info
->emitrelocations
4862 || bed
->elf_backend_emit_relocs
);
4865 finfo
.output_bfd
= abfd
;
4866 finfo
.symstrtab
= elf_stringtab_init ();
4867 if (finfo
.symstrtab
== NULL
)
4872 finfo
.dynsym_sec
= NULL
;
4873 finfo
.hash_sec
= NULL
;
4874 finfo
.symver_sec
= NULL
;
4878 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4879 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4880 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4881 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4882 /* Note that it is OK if symver_sec is NULL. */
4885 finfo
.contents
= NULL
;
4886 finfo
.external_relocs
= NULL
;
4887 finfo
.internal_relocs
= NULL
;
4888 finfo
.external_syms
= NULL
;
4889 finfo
.locsym_shndx
= NULL
;
4890 finfo
.internal_syms
= NULL
;
4891 finfo
.indices
= NULL
;
4892 finfo
.sections
= NULL
;
4893 finfo
.symbuf
= NULL
;
4894 finfo
.symshndxbuf
= NULL
;
4895 finfo
.symbuf_count
= 0;
4897 /* Count up the number of relocations we will output for each output
4898 section, so that we know the sizes of the reloc sections. We
4899 also figure out some maximum sizes. */
4900 max_contents_size
= 0;
4901 max_external_reloc_size
= 0;
4902 max_internal_reloc_count
= 0;
4904 max_sym_shndx_count
= 0;
4906 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4910 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4912 if (p
->type
== bfd_section_reloc_link_order
4913 || p
->type
== bfd_symbol_reloc_link_order
)
4915 else if (p
->type
== bfd_indirect_link_order
)
4919 sec
= p
->u
.indirect
.section
;
4921 /* Mark all sections which are to be included in the
4922 link. This will normally be every section. We need
4923 to do this so that we can identify any sections which
4924 the linker has decided to not include. */
4925 sec
->linker_mark
= true;
4927 if (sec
->flags
& SEC_MERGE
)
4930 if (info
->relocateable
|| info
->emitrelocations
)
4931 o
->reloc_count
+= sec
->reloc_count
;
4932 else if (bed
->elf_backend_count_relocs
)
4934 Elf_Internal_Rela
* relocs
;
4936 relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4937 (abfd
, sec
, (PTR
) NULL
,
4938 (Elf_Internal_Rela
*) NULL
, info
->keep_memory
));
4940 o
->reloc_count
+= (*bed
->elf_backend_count_relocs
)
4943 if (!info
->keep_memory
)
4947 if (sec
->_raw_size
> max_contents_size
)
4948 max_contents_size
= sec
->_raw_size
;
4949 if (sec
->_cooked_size
> max_contents_size
)
4950 max_contents_size
= sec
->_cooked_size
;
4952 /* We are interested in just local symbols, not all
4954 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
4955 && (sec
->owner
->flags
& DYNAMIC
) == 0)
4959 if (elf_bad_symtab (sec
->owner
))
4960 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
4961 / sizeof (Elf_External_Sym
));
4963 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
4965 if (sym_count
> max_sym_count
)
4966 max_sym_count
= sym_count
;
4968 if (sym_count
> max_sym_shndx_count
4969 && elf_symtab_shndx (sec
->owner
) != 0)
4970 max_sym_shndx_count
= sym_count
;
4972 if ((sec
->flags
& SEC_RELOC
) != 0)
4976 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
4977 if (ext_size
> max_external_reloc_size
)
4978 max_external_reloc_size
= ext_size
;
4979 if (sec
->reloc_count
> max_internal_reloc_count
)
4980 max_internal_reloc_count
= sec
->reloc_count
;
4986 if (o
->reloc_count
> 0)
4987 o
->flags
|= SEC_RELOC
;
4990 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4991 set it (this is probably a bug) and if it is set
4992 assign_section_numbers will create a reloc section. */
4993 o
->flags
&=~ SEC_RELOC
;
4996 /* If the SEC_ALLOC flag is not set, force the section VMA to
4997 zero. This is done in elf_fake_sections as well, but forcing
4998 the VMA to 0 here will ensure that relocs against these
4999 sections are handled correctly. */
5000 if ((o
->flags
& SEC_ALLOC
) == 0
5001 && ! o
->user_set_vma
)
5005 if (! info
->relocateable
&& merged
)
5006 elf_link_hash_traverse (elf_hash_table (info
),
5007 elf_link_sec_merge_syms
, (PTR
) abfd
);
5009 /* Figure out the file positions for everything but the symbol table
5010 and the relocs. We set symcount to force assign_section_numbers
5011 to create a symbol table. */
5012 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
5013 BFD_ASSERT (! abfd
->output_has_begun
);
5014 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
5017 /* Figure out how many relocations we will have in each section.
5018 Just using RELOC_COUNT isn't good enough since that doesn't
5019 maintain a separate value for REL vs. RELA relocations. */
5021 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5022 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5024 asection
*output_section
;
5026 if (! o
->linker_mark
)
5028 /* This section was omitted from the link. */
5032 output_section
= o
->output_section
;
5034 if (output_section
!= NULL
5035 && (o
->flags
& SEC_RELOC
) != 0)
5037 struct bfd_elf_section_data
*esdi
5038 = elf_section_data (o
);
5039 struct bfd_elf_section_data
*esdo
5040 = elf_section_data (output_section
);
5041 unsigned int *rel_count
;
5042 unsigned int *rel_count2
;
5044 /* We must be careful to add the relocation froms the
5045 input section to the right output count. */
5046 if (esdi
->rel_hdr
.sh_entsize
== esdo
->rel_hdr
.sh_entsize
)
5048 rel_count
= &esdo
->rel_count
;
5049 rel_count2
= &esdo
->rel_count2
;
5053 rel_count
= &esdo
->rel_count2
;
5054 rel_count2
= &esdo
->rel_count
;
5057 *rel_count
+= NUM_SHDR_ENTRIES (& esdi
->rel_hdr
);
5059 *rel_count2
+= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
5060 output_section
->flags
|= SEC_RELOC
;
5064 /* That created the reloc sections. Set their sizes, and assign
5065 them file positions, and allocate some buffers. */
5066 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5068 if ((o
->flags
& SEC_RELOC
) != 0)
5070 if (!elf_link_size_reloc_section (abfd
,
5071 &elf_section_data (o
)->rel_hdr
,
5075 if (elf_section_data (o
)->rel_hdr2
5076 && !elf_link_size_reloc_section (abfd
,
5077 elf_section_data (o
)->rel_hdr2
,
5082 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
5083 to count upwards while actually outputting the relocations. */
5084 elf_section_data (o
)->rel_count
= 0;
5085 elf_section_data (o
)->rel_count2
= 0;
5088 _bfd_elf_assign_file_positions_for_relocs (abfd
);
5090 /* We have now assigned file positions for all the sections except
5091 .symtab and .strtab. We start the .symtab section at the current
5092 file position, and write directly to it. We build the .strtab
5093 section in memory. */
5094 bfd_get_symcount (abfd
) = 0;
5095 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
5096 /* sh_name is set in prep_headers. */
5097 symtab_hdr
->sh_type
= SHT_SYMTAB
;
5098 symtab_hdr
->sh_flags
= 0;
5099 symtab_hdr
->sh_addr
= 0;
5100 symtab_hdr
->sh_size
= 0;
5101 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
5102 /* sh_link is set in assign_section_numbers. */
5103 /* sh_info is set below. */
5104 /* sh_offset is set just below. */
5105 symtab_hdr
->sh_addralign
= bed
->s
->file_align
;
5107 off
= elf_tdata (abfd
)->next_file_pos
;
5108 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
5110 /* Note that at this point elf_tdata (abfd)->next_file_pos is
5111 incorrect. We do not yet know the size of the .symtab section.
5112 We correct next_file_pos below, after we do know the size. */
5114 /* Allocate a buffer to hold swapped out symbols. This is to avoid
5115 continuously seeking to the right position in the file. */
5116 if (! info
->keep_memory
|| max_sym_count
< 20)
5117 finfo
.symbuf_size
= 20;
5119 finfo
.symbuf_size
= max_sym_count
;
5120 amt
= finfo
.symbuf_size
;
5121 amt
*= sizeof (Elf_External_Sym
);
5122 finfo
.symbuf
= (Elf_External_Sym
*) bfd_malloc (amt
);
5123 if (finfo
.symbuf
== NULL
)
5125 if (elf_numsections (abfd
) > SHN_LORESERVE
)
5127 amt
= finfo
.symbuf_size
;
5128 amt
*= sizeof (Elf_External_Sym_Shndx
);
5129 finfo
.symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
5130 if (finfo
.symshndxbuf
== NULL
)
5134 /* Start writing out the symbol table. The first symbol is always a
5136 if (info
->strip
!= strip_all
5139 elfsym
.st_value
= 0;
5142 elfsym
.st_other
= 0;
5143 elfsym
.st_shndx
= SHN_UNDEF
;
5144 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5145 &elfsym
, bfd_und_section_ptr
))
5150 /* Some standard ELF linkers do this, but we don't because it causes
5151 bootstrap comparison failures. */
5152 /* Output a file symbol for the output file as the second symbol.
5153 We output this even if we are discarding local symbols, although
5154 I'm not sure if this is correct. */
5155 elfsym
.st_value
= 0;
5157 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
5158 elfsym
.st_other
= 0;
5159 elfsym
.st_shndx
= SHN_ABS
;
5160 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
5161 &elfsym
, bfd_abs_section_ptr
))
5165 /* Output a symbol for each section. We output these even if we are
5166 discarding local symbols, since they are used for relocs. These
5167 symbols have no names. We store the index of each one in the
5168 index field of the section, so that we can find it again when
5169 outputting relocs. */
5170 if (info
->strip
!= strip_all
5174 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5175 elfsym
.st_other
= 0;
5176 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5178 o
= section_from_elf_index (abfd
, i
);
5180 o
->target_index
= bfd_get_symcount (abfd
);
5181 elfsym
.st_shndx
= i
;
5182 if (info
->relocateable
|| o
== NULL
)
5183 elfsym
.st_value
= 0;
5185 elfsym
.st_value
= o
->vma
;
5186 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5189 if (i
== SHN_LORESERVE
)
5190 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
5194 /* Allocate some memory to hold information read in from the input
5196 if (max_contents_size
!= 0)
5198 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
5199 if (finfo
.contents
== NULL
)
5203 if (max_external_reloc_size
!= 0)
5205 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
5206 if (finfo
.external_relocs
== NULL
)
5210 if (max_internal_reloc_count
!= 0)
5212 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5213 amt
*= sizeof (Elf_Internal_Rela
);
5214 finfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
5215 if (finfo
.internal_relocs
== NULL
)
5219 if (max_sym_count
!= 0)
5221 amt
= max_sym_count
* sizeof (Elf_External_Sym
);
5222 finfo
.external_syms
= (Elf_External_Sym
*) bfd_malloc (amt
);
5223 if (finfo
.external_syms
== NULL
)
5226 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
5227 finfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
5228 if (finfo
.internal_syms
== NULL
)
5231 amt
= max_sym_count
* sizeof (long);
5232 finfo
.indices
= (long *) bfd_malloc (amt
);
5233 if (finfo
.indices
== NULL
)
5236 amt
= max_sym_count
* sizeof (asection
*);
5237 finfo
.sections
= (asection
**) bfd_malloc (amt
);
5238 if (finfo
.sections
== NULL
)
5242 if (max_sym_shndx_count
!= 0)
5244 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
5245 finfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
5246 if (finfo
.locsym_shndx
== NULL
)
5250 /* Since ELF permits relocations to be against local symbols, we
5251 must have the local symbols available when we do the relocations.
5252 Since we would rather only read the local symbols once, and we
5253 would rather not keep them in memory, we handle all the
5254 relocations for a single input file at the same time.
5256 Unfortunately, there is no way to know the total number of local
5257 symbols until we have seen all of them, and the local symbol
5258 indices precede the global symbol indices. This means that when
5259 we are generating relocateable output, and we see a reloc against
5260 a global symbol, we can not know the symbol index until we have
5261 finished examining all the local symbols to see which ones we are
5262 going to output. To deal with this, we keep the relocations in
5263 memory, and don't output them until the end of the link. This is
5264 an unfortunate waste of memory, but I don't see a good way around
5265 it. Fortunately, it only happens when performing a relocateable
5266 link, which is not the common case. FIXME: If keep_memory is set
5267 we could write the relocs out and then read them again; I don't
5268 know how bad the memory loss will be. */
5270 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5271 sub
->output_has_begun
= false;
5272 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5274 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
5276 if (p
->type
== bfd_indirect_link_order
5277 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
5278 == bfd_target_elf_flavour
))
5280 sub
= p
->u
.indirect
.section
->owner
;
5281 if (! sub
->output_has_begun
)
5283 if (! elf_link_input_bfd (&finfo
, sub
))
5285 sub
->output_has_begun
= true;
5288 else if (p
->type
== bfd_section_reloc_link_order
5289 || p
->type
== bfd_symbol_reloc_link_order
)
5291 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
5296 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
5302 /* That wrote out all the local symbols. Finish up the symbol table
5303 with the global symbols. Even if we want to strip everything we
5304 can, we still need to deal with those global symbols that got
5305 converted to local in a version script. */
5309 /* Output any global symbols that got converted to local in a
5310 version script. We do this in a separate step since ELF
5311 requires all local symbols to appear prior to any global
5312 symbols. FIXME: We should only do this if some global
5313 symbols were, in fact, converted to become local. FIXME:
5314 Will this work correctly with the Irix 5 linker? */
5315 eoinfo
.failed
= false;
5316 eoinfo
.finfo
= &finfo
;
5317 eoinfo
.localsyms
= true;
5318 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5324 /* The sh_info field records the index of the first non local symbol. */
5325 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
5328 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
5330 Elf_Internal_Sym sym
;
5331 Elf_External_Sym
*dynsym
=
5332 (Elf_External_Sym
*) finfo
.dynsym_sec
->contents
;
5333 long last_local
= 0;
5335 /* Write out the section symbols for the output sections. */
5342 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5345 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5348 Elf_External_Sym
*dest
;
5350 indx
= elf_section_data (s
)->this_idx
;
5351 BFD_ASSERT (indx
> 0);
5352 sym
.st_shndx
= indx
;
5353 sym
.st_value
= s
->vma
;
5354 dest
= dynsym
+ elf_section_data (s
)->dynindx
;
5355 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5358 last_local
= bfd_count_sections (abfd
);
5361 /* Write out the local dynsyms. */
5362 if (elf_hash_table (info
)->dynlocal
)
5364 struct elf_link_local_dynamic_entry
*e
;
5365 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
5368 Elf_External_Sym
*dest
;
5370 sym
.st_size
= e
->isym
.st_size
;
5371 sym
.st_other
= e
->isym
.st_other
;
5373 /* Copy the internal symbol as is.
5374 Note that we saved a word of storage and overwrote
5375 the original st_name with the dynstr_index. */
5378 if (e
->isym
.st_shndx
!= SHN_UNDEF
5379 && (e
->isym
.st_shndx
< SHN_LORESERVE
5380 || e
->isym
.st_shndx
> SHN_HIRESERVE
))
5382 s
= bfd_section_from_elf_index (e
->input_bfd
,
5386 elf_section_data (s
->output_section
)->this_idx
;
5387 sym
.st_value
= (s
->output_section
->vma
5389 + e
->isym
.st_value
);
5392 if (last_local
< e
->dynindx
)
5393 last_local
= e
->dynindx
;
5395 dest
= dynsym
+ e
->dynindx
;
5396 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5400 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
5404 /* We get the global symbols from the hash table. */
5405 eoinfo
.failed
= false;
5406 eoinfo
.localsyms
= false;
5407 eoinfo
.finfo
= &finfo
;
5408 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5413 /* If backend needs to output some symbols not present in the hash
5414 table, do it now. */
5415 if (bed
->elf_backend_output_arch_syms
)
5417 typedef boolean (*out_sym_func
) PARAMS ((PTR
, const char *,
5421 if (! ((*bed
->elf_backend_output_arch_syms
)
5422 (abfd
, info
, (PTR
) &finfo
, (out_sym_func
) elf_link_output_sym
)))
5426 /* Flush all symbols to the file. */
5427 if (! elf_link_flush_output_syms (&finfo
))
5430 /* Now we know the size of the symtab section. */
5431 off
+= symtab_hdr
->sh_size
;
5433 /* Finish up and write out the symbol string table (.strtab)
5435 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
5436 /* sh_name was set in prep_headers. */
5437 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
5438 symstrtab_hdr
->sh_flags
= 0;
5439 symstrtab_hdr
->sh_addr
= 0;
5440 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
5441 symstrtab_hdr
->sh_entsize
= 0;
5442 symstrtab_hdr
->sh_link
= 0;
5443 symstrtab_hdr
->sh_info
= 0;
5444 /* sh_offset is set just below. */
5445 symstrtab_hdr
->sh_addralign
= 1;
5447 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
5448 elf_tdata (abfd
)->next_file_pos
= off
;
5450 if (bfd_get_symcount (abfd
) > 0)
5452 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
5453 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
5457 /* Adjust the relocs to have the correct symbol indices. */
5458 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5460 if ((o
->flags
& SEC_RELOC
) == 0)
5463 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
5464 elf_section_data (o
)->rel_count
,
5465 elf_section_data (o
)->rel_hashes
);
5466 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
5467 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
5468 elf_section_data (o
)->rel_count2
,
5469 (elf_section_data (o
)->rel_hashes
5470 + elf_section_data (o
)->rel_count
));
5472 /* Set the reloc_count field to 0 to prevent write_relocs from
5473 trying to swap the relocs out itself. */
5477 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
5478 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
5480 /* If we are linking against a dynamic object, or generating a
5481 shared library, finish up the dynamic linking information. */
5484 Elf_External_Dyn
*dyncon
, *dynconend
;
5486 /* Fix up .dynamic entries. */
5487 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
5488 BFD_ASSERT (o
!= NULL
);
5490 dyncon
= (Elf_External_Dyn
*) o
->contents
;
5491 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
5492 for (; dyncon
< dynconend
; dyncon
++)
5494 Elf_Internal_Dyn dyn
;
5498 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
5505 if (relativecount
> 0 && dyncon
+ 1 < dynconend
)
5507 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
5509 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
5510 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
5513 if (dyn
.d_tag
!= DT_NULL
)
5515 dyn
.d_un
.d_val
= relativecount
;
5516 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5522 name
= info
->init_function
;
5525 name
= info
->fini_function
;
5528 struct elf_link_hash_entry
*h
;
5530 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
5531 false, false, true);
5533 && (h
->root
.type
== bfd_link_hash_defined
5534 || h
->root
.type
== bfd_link_hash_defweak
))
5536 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
5537 o
= h
->root
.u
.def
.section
;
5538 if (o
->output_section
!= NULL
)
5539 dyn
.d_un
.d_val
+= (o
->output_section
->vma
5540 + o
->output_offset
);
5543 /* The symbol is imported from another shared
5544 library and does not apply to this one. */
5548 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5563 name
= ".gnu.version_d";
5566 name
= ".gnu.version_r";
5569 name
= ".gnu.version";
5571 o
= bfd_get_section_by_name (abfd
, name
);
5572 BFD_ASSERT (o
!= NULL
);
5573 dyn
.d_un
.d_ptr
= o
->vma
;
5574 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5581 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
5586 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5588 Elf_Internal_Shdr
*hdr
;
5590 hdr
= elf_elfsections (abfd
)[i
];
5591 if (hdr
->sh_type
== type
5592 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
5594 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
5595 dyn
.d_un
.d_val
+= hdr
->sh_size
;
5598 if (dyn
.d_un
.d_val
== 0
5599 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
5600 dyn
.d_un
.d_val
= hdr
->sh_addr
;
5604 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5610 /* If we have created any dynamic sections, then output them. */
5613 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
5616 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
5618 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5619 || o
->_raw_size
== 0
5620 || o
->output_section
== bfd_abs_section_ptr
)
5622 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
5624 /* At this point, we are only interested in sections
5625 created by elf_link_create_dynamic_sections. */
5628 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
5630 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
5632 if (! bfd_set_section_contents (abfd
, o
->output_section
,
5634 (file_ptr
) o
->output_offset
,
5640 /* The contents of the .dynstr section are actually in a
5642 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
5643 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
5644 || ! _bfd_elf_strtab_emit (abfd
,
5645 elf_hash_table (info
)->dynstr
))
5651 /* If we have optimized stabs strings, output them. */
5652 if (elf_hash_table (info
)->stab_info
!= NULL
)
5654 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
5658 if (info
->eh_frame_hdr
&& elf_hash_table (info
)->dynobj
)
5660 o
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5663 && (elf_section_data (o
)->sec_info_type
5664 == ELF_INFO_TYPE_EH_FRAME_HDR
))
5666 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, o
))
5671 if (finfo
.symstrtab
!= NULL
)
5672 _bfd_stringtab_free (finfo
.symstrtab
);
5673 if (finfo
.contents
!= NULL
)
5674 free (finfo
.contents
);
5675 if (finfo
.external_relocs
!= NULL
)
5676 free (finfo
.external_relocs
);
5677 if (finfo
.internal_relocs
!= NULL
)
5678 free (finfo
.internal_relocs
);
5679 if (finfo
.external_syms
!= NULL
)
5680 free (finfo
.external_syms
);
5681 if (finfo
.locsym_shndx
!= NULL
)
5682 free (finfo
.locsym_shndx
);
5683 if (finfo
.internal_syms
!= NULL
)
5684 free (finfo
.internal_syms
);
5685 if (finfo
.indices
!= NULL
)
5686 free (finfo
.indices
);
5687 if (finfo
.sections
!= NULL
)
5688 free (finfo
.sections
);
5689 if (finfo
.symbuf
!= NULL
)
5690 free (finfo
.symbuf
);
5691 if (finfo
.symshndxbuf
!= NULL
)
5692 free (finfo
.symbuf
);
5693 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5695 if ((o
->flags
& SEC_RELOC
) != 0
5696 && elf_section_data (o
)->rel_hashes
!= NULL
)
5697 free (elf_section_data (o
)->rel_hashes
);
5700 elf_tdata (abfd
)->linker
= true;
5705 if (finfo
.symstrtab
!= NULL
)
5706 _bfd_stringtab_free (finfo
.symstrtab
);
5707 if (finfo
.contents
!= NULL
)
5708 free (finfo
.contents
);
5709 if (finfo
.external_relocs
!= NULL
)
5710 free (finfo
.external_relocs
);
5711 if (finfo
.internal_relocs
!= NULL
)
5712 free (finfo
.internal_relocs
);
5713 if (finfo
.external_syms
!= NULL
)
5714 free (finfo
.external_syms
);
5715 if (finfo
.locsym_shndx
!= NULL
)
5716 free (finfo
.locsym_shndx
);
5717 if (finfo
.internal_syms
!= NULL
)
5718 free (finfo
.internal_syms
);
5719 if (finfo
.indices
!= NULL
)
5720 free (finfo
.indices
);
5721 if (finfo
.sections
!= NULL
)
5722 free (finfo
.sections
);
5723 if (finfo
.symbuf
!= NULL
)
5724 free (finfo
.symbuf
);
5725 if (finfo
.symshndxbuf
!= NULL
)
5726 free (finfo
.symbuf
);
5727 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5729 if ((o
->flags
& SEC_RELOC
) != 0
5730 && elf_section_data (o
)->rel_hashes
!= NULL
)
5731 free (elf_section_data (o
)->rel_hashes
);
5737 /* Add a symbol to the output symbol table. */
5740 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
5741 struct elf_final_link_info
*finfo
;
5743 Elf_Internal_Sym
*elfsym
;
5744 asection
*input_sec
;
5746 Elf_External_Sym
*dest
;
5747 Elf_External_Sym_Shndx
*destshndx
;
5749 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
5750 struct bfd_link_info
*info
,
5755 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
5756 elf_backend_link_output_symbol_hook
;
5757 if (output_symbol_hook
!= NULL
)
5759 if (! ((*output_symbol_hook
)
5760 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
5764 if (name
== (const char *) NULL
|| *name
== '\0')
5765 elfsym
->st_name
= 0;
5766 else if (input_sec
->flags
& SEC_EXCLUDE
)
5767 elfsym
->st_name
= 0;
5770 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5772 if (elfsym
->st_name
== (unsigned long) -1)
5776 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5778 if (! elf_link_flush_output_syms (finfo
))
5782 dest
= finfo
->symbuf
+ finfo
->symbuf_count
;
5783 destshndx
= finfo
->symshndxbuf
;
5784 if (destshndx
!= NULL
)
5785 destshndx
+= finfo
->symbuf_count
;
5786 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
, (PTR
) dest
, (PTR
) destshndx
);
5787 ++finfo
->symbuf_count
;
5789 ++ bfd_get_symcount (finfo
->output_bfd
);
5794 /* Flush the output symbols to the file. */
5797 elf_link_flush_output_syms (finfo
)
5798 struct elf_final_link_info
*finfo
;
5800 if (finfo
->symbuf_count
> 0)
5802 Elf_Internal_Shdr
*hdr
;
5806 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5807 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5808 amt
= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
5809 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5810 || bfd_bwrite ((PTR
) finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
5813 hdr
->sh_size
+= amt
;
5815 if (finfo
->symshndxbuf
!= NULL
)
5817 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_shndx_hdr
;
5818 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5819 amt
= finfo
->symbuf_count
* sizeof (Elf_External_Sym_Shndx
);
5820 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5821 || (bfd_bwrite ((PTR
) finfo
->symshndxbuf
, amt
, finfo
->output_bfd
)
5825 hdr
->sh_size
+= amt
;
5828 finfo
->symbuf_count
= 0;
5834 /* Adjust all external symbols pointing into SEC_MERGE sections
5835 to reflect the object merging within the sections. */
5838 elf_link_sec_merge_syms (h
, data
)
5839 struct elf_link_hash_entry
*h
;
5844 if ((h
->root
.type
== bfd_link_hash_defined
5845 || h
->root
.type
== bfd_link_hash_defweak
)
5846 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
5847 && elf_section_data (sec
)->sec_info_type
== ELF_INFO_TYPE_MERGE
)
5849 bfd
*output_bfd
= (bfd
*) data
;
5851 h
->root
.u
.def
.value
=
5852 _bfd_merged_section_offset (output_bfd
,
5853 &h
->root
.u
.def
.section
,
5854 elf_section_data (sec
)->sec_info
,
5855 h
->root
.u
.def
.value
, (bfd_vma
) 0);
5861 /* Add an external symbol to the symbol table. This is called from
5862 the hash table traversal routine. When generating a shared object,
5863 we go through the symbol table twice. The first time we output
5864 anything that might have been forced to local scope in a version
5865 script. The second time we output the symbols that are still
5869 elf_link_output_extsym (h
, data
)
5870 struct elf_link_hash_entry
*h
;
5873 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
5874 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
5876 Elf_Internal_Sym sym
;
5877 asection
*input_sec
;
5879 /* Decide whether to output this symbol in this pass. */
5880 if (eoinfo
->localsyms
)
5882 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5887 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5891 /* If we are not creating a shared library, and this symbol is
5892 referenced by a shared library but is not defined anywhere, then
5893 warn that it is undefined. If we do not do this, the runtime
5894 linker will complain that the symbol is undefined when the
5895 program is run. We don't have to worry about symbols that are
5896 referenced by regular files, because we will already have issued
5897 warnings for them. */
5898 if (! finfo
->info
->relocateable
5899 && ! finfo
->info
->allow_shlib_undefined
5900 && ! finfo
->info
->shared
5901 && h
->root
.type
== bfd_link_hash_undefined
5902 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
5903 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5905 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
5906 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
5907 (asection
*) NULL
, (bfd_vma
) 0, true)))
5909 eoinfo
->failed
= true;
5914 /* We don't want to output symbols that have never been mentioned by
5915 a regular file, or that we have been told to strip. However, if
5916 h->indx is set to -2, the symbol is used by a reloc and we must
5920 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
5921 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
5922 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
5923 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5925 else if (finfo
->info
->strip
== strip_all
5926 || (finfo
->info
->strip
== strip_some
5927 && bfd_hash_lookup (finfo
->info
->keep_hash
,
5928 h
->root
.root
.string
,
5929 false, false) == NULL
))
5934 /* If we're stripping it, and it's not a dynamic symbol, there's
5935 nothing else to do unless it is a forced local symbol. */
5938 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5942 sym
.st_size
= h
->size
;
5943 sym
.st_other
= h
->other
;
5944 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5945 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
5946 else if (h
->root
.type
== bfd_link_hash_undefweak
5947 || h
->root
.type
== bfd_link_hash_defweak
)
5948 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
5950 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
5952 switch (h
->root
.type
)
5955 case bfd_link_hash_new
:
5959 case bfd_link_hash_undefined
:
5960 input_sec
= bfd_und_section_ptr
;
5961 sym
.st_shndx
= SHN_UNDEF
;
5964 case bfd_link_hash_undefweak
:
5965 input_sec
= bfd_und_section_ptr
;
5966 sym
.st_shndx
= SHN_UNDEF
;
5969 case bfd_link_hash_defined
:
5970 case bfd_link_hash_defweak
:
5972 input_sec
= h
->root
.u
.def
.section
;
5973 if (input_sec
->output_section
!= NULL
)
5976 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
5977 input_sec
->output_section
);
5978 if (sym
.st_shndx
== SHN_BAD
)
5980 (*_bfd_error_handler
)
5981 (_("%s: could not find output section %s for input section %s"),
5982 bfd_get_filename (finfo
->output_bfd
),
5983 input_sec
->output_section
->name
,
5985 eoinfo
->failed
= true;
5989 /* ELF symbols in relocateable files are section relative,
5990 but in nonrelocateable files they are virtual
5992 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
5993 if (! finfo
->info
->relocateable
)
5994 sym
.st_value
+= input_sec
->output_section
->vma
;
5998 BFD_ASSERT (input_sec
->owner
== NULL
5999 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
6000 sym
.st_shndx
= SHN_UNDEF
;
6001 input_sec
= bfd_und_section_ptr
;
6006 case bfd_link_hash_common
:
6007 input_sec
= h
->root
.u
.c
.p
->section
;
6008 sym
.st_shndx
= SHN_COMMON
;
6009 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
6012 case bfd_link_hash_indirect
:
6013 /* These symbols are created by symbol versioning. They point
6014 to the decorated version of the name. For example, if the
6015 symbol foo@@GNU_1.2 is the default, which should be used when
6016 foo is used with no version, then we add an indirect symbol
6017 foo which points to foo@@GNU_1.2. We ignore these symbols,
6018 since the indirected symbol is already in the hash table. */
6021 case bfd_link_hash_warning
:
6022 /* We can't represent these symbols in ELF, although a warning
6023 symbol may have come from a .gnu.warning.SYMBOL section. We
6024 just put the target symbol in the hash table. If the target
6025 symbol does not really exist, don't do anything. */
6026 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
6028 return (elf_link_output_extsym
6029 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
6032 /* Give the processor backend a chance to tweak the symbol value,
6033 and also to finish up anything that needs to be done for this
6035 if ((h
->dynindx
!= -1
6036 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6037 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6039 struct elf_backend_data
*bed
;
6041 bed
= get_elf_backend_data (finfo
->output_bfd
);
6042 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
6043 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
6045 eoinfo
->failed
= true;
6050 /* If we are marking the symbol as undefined, and there are no
6051 non-weak references to this symbol from a regular object, then
6052 mark the symbol as weak undefined; if there are non-weak
6053 references, mark the symbol as strong. We can't do this earlier,
6054 because it might not be marked as undefined until the
6055 finish_dynamic_symbol routine gets through with it. */
6056 if (sym
.st_shndx
== SHN_UNDEF
6057 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
6058 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
6059 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
6063 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
6064 bindtype
= STB_GLOBAL
;
6066 bindtype
= STB_WEAK
;
6067 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
6070 /* If a symbol is not defined locally, we clear the visibility
6072 if (! finfo
->info
->relocateable
6073 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6074 sym
.st_other
^= ELF_ST_VISIBILITY (sym
.st_other
);
6076 /* If this symbol should be put in the .dynsym section, then put it
6077 there now. We have already know the symbol index. We also fill
6078 in the entry in the .hash section. */
6079 if (h
->dynindx
!= -1
6080 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6084 size_t hash_entry_size
;
6085 bfd_byte
*bucketpos
;
6087 Elf_External_Sym
*esym
;
6089 sym
.st_name
= h
->dynstr_index
;
6090 esym
= (Elf_External_Sym
*) finfo
->dynsym_sec
->contents
+ h
->dynindx
;
6091 elf_swap_symbol_out (finfo
->output_bfd
, &sym
, (PTR
) esym
, (PTR
) 0);
6093 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
6094 bucket
= h
->elf_hash_value
% bucketcount
;
6096 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
6097 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
6098 + (bucket
+ 2) * hash_entry_size
);
6099 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
6100 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, (bfd_vma
) h
->dynindx
,
6102 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
6103 ((bfd_byte
*) finfo
->hash_sec
->contents
6104 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
6106 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
6108 Elf_Internal_Versym iversym
;
6109 Elf_External_Versym
*eversym
;
6111 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6113 if (h
->verinfo
.verdef
== NULL
)
6114 iversym
.vs_vers
= 0;
6116 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
6120 if (h
->verinfo
.vertree
== NULL
)
6121 iversym
.vs_vers
= 1;
6123 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
6126 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
6127 iversym
.vs_vers
|= VERSYM_HIDDEN
;
6129 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
6130 eversym
+= h
->dynindx
;
6131 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
6135 /* If we're stripping it, then it was just a dynamic symbol, and
6136 there's nothing else to do. */
6140 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
6142 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
6144 eoinfo
->failed
= true;
6151 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
6152 originated from the section given by INPUT_REL_HDR) to the
6156 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
6159 asection
*input_section
;
6160 Elf_Internal_Shdr
*input_rel_hdr
;
6161 Elf_Internal_Rela
*internal_relocs
;
6163 Elf_Internal_Rela
*irela
;
6164 Elf_Internal_Rela
*irelaend
;
6165 Elf_Internal_Shdr
*output_rel_hdr
;
6166 asection
*output_section
;
6167 unsigned int *rel_countp
= NULL
;
6168 struct elf_backend_data
*bed
;
6171 output_section
= input_section
->output_section
;
6172 output_rel_hdr
= NULL
;
6174 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
6175 == input_rel_hdr
->sh_entsize
)
6177 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
6178 rel_countp
= &elf_section_data (output_section
)->rel_count
;
6180 else if (elf_section_data (output_section
)->rel_hdr2
6181 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
6182 == input_rel_hdr
->sh_entsize
))
6184 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
6185 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
6188 BFD_ASSERT (output_rel_hdr
!= NULL
);
6190 bed
= get_elf_backend_data (output_bfd
);
6191 irela
= internal_relocs
;
6192 irelaend
= irela
+ NUM_SHDR_ENTRIES (input_rel_hdr
)
6193 * bed
->s
->int_rels_per_ext_rel
;
6195 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
6197 Elf_External_Rel
*erel
;
6198 Elf_Internal_Rel
*irel
;
6200 amt
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
6201 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (amt
);
6204 (*_bfd_error_handler
) (_("Error: out of memory"));
6208 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
6209 for (; irela
< irelaend
; irela
+= bed
->s
->int_rels_per_ext_rel
, erel
++)
6213 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
6215 irel
[i
].r_offset
= irela
[i
].r_offset
;
6216 irel
[i
].r_info
= irela
[i
].r_info
;
6217 BFD_ASSERT (irela
[i
].r_addend
== 0);
6220 if (bed
->s
->swap_reloc_out
)
6221 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, (PTR
) erel
);
6223 elf_swap_reloc_out (output_bfd
, irel
, erel
);
6230 Elf_External_Rela
*erela
;
6232 BFD_ASSERT (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
6234 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
6235 for (; irela
< irelaend
; irela
+= bed
->s
->int_rels_per_ext_rel
, erela
++)
6236 if (bed
->s
->swap_reloca_out
)
6237 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (PTR
) erela
);
6239 elf_swap_reloca_out (output_bfd
, irela
, erela
);
6242 /* Bump the counter, so that we know where to add the next set of
6244 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
6247 /* Link an input file into the linker output file. This function
6248 handles all the sections and relocations of the input file at once.
6249 This is so that we only have to read the local symbols once, and
6250 don't have to keep them in memory. */
6253 elf_link_input_bfd (finfo
, input_bfd
)
6254 struct elf_final_link_info
*finfo
;
6257 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
6258 bfd
*, asection
*, bfd_byte
*,
6259 Elf_Internal_Rela
*,
6260 Elf_Internal_Sym
*, asection
**));
6262 Elf_Internal_Shdr
*symtab_hdr
;
6263 Elf_Internal_Shdr
*shndx_hdr
;
6266 Elf_External_Sym
*external_syms
;
6267 Elf_External_Sym
*esym
;
6268 Elf_External_Sym
*esymend
;
6269 Elf_External_Sym_Shndx
*shndx_buf
;
6270 Elf_External_Sym_Shndx
*shndx
;
6271 Elf_Internal_Sym
*isym
;
6273 asection
**ppsection
;
6275 struct elf_backend_data
*bed
;
6276 boolean emit_relocs
;
6277 struct elf_link_hash_entry
**sym_hashes
;
6279 output_bfd
= finfo
->output_bfd
;
6280 bed
= get_elf_backend_data (output_bfd
);
6281 relocate_section
= bed
->elf_backend_relocate_section
;
6283 /* If this is a dynamic object, we don't want to do anything here:
6284 we don't want the local symbols, and we don't want the section
6286 if ((input_bfd
->flags
& DYNAMIC
) != 0)
6289 emit_relocs
= (finfo
->info
->relocateable
6290 || finfo
->info
->emitrelocations
6291 || bed
->elf_backend_emit_relocs
);
6293 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6294 if (elf_bad_symtab (input_bfd
))
6296 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6301 locsymcount
= symtab_hdr
->sh_info
;
6302 extsymoff
= symtab_hdr
->sh_info
;
6305 /* Read the local symbols. */
6306 if (symtab_hdr
->contents
!= NULL
)
6307 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
6308 else if (locsymcount
== 0)
6309 external_syms
= NULL
;
6312 bfd_size_type amt
= locsymcount
* sizeof (Elf_External_Sym
);
6313 external_syms
= finfo
->external_syms
;
6314 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
6315 || bfd_bread (external_syms
, amt
, input_bfd
) != amt
)
6319 shndx_hdr
= &elf_tdata (input_bfd
)->symtab_shndx_hdr
;
6321 if (shndx_hdr
->sh_size
!= 0 && locsymcount
!= 0)
6323 bfd_size_type amt
= locsymcount
* sizeof (Elf_External_Sym_Shndx
);
6324 shndx_buf
= finfo
->locsym_shndx
;
6325 if (bfd_seek (input_bfd
, shndx_hdr
->sh_offset
, SEEK_SET
) != 0
6326 || bfd_bread (shndx_buf
, amt
, input_bfd
) != amt
)
6330 /* Swap in the local symbols and write out the ones which we know
6331 are going into the output file. */
6332 for (esym
= external_syms
, esymend
= esym
+ locsymcount
,
6333 isym
= finfo
->internal_syms
, pindex
= finfo
->indices
,
6334 ppsection
= finfo
->sections
, shndx
= shndx_buf
;
6336 esym
++, isym
++, pindex
++, ppsection
++,
6337 shndx
= (shndx
!= NULL
? shndx
+ 1 : NULL
))
6341 Elf_Internal_Sym osym
;
6343 elf_swap_symbol_in (input_bfd
, esym
, shndx
, isym
);
6346 if (elf_bad_symtab (input_bfd
))
6348 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
6355 if (isym
->st_shndx
== SHN_UNDEF
)
6356 isec
= bfd_und_section_ptr
;
6357 else if (isym
->st_shndx
< SHN_LORESERVE
6358 || isym
->st_shndx
> SHN_HIRESERVE
)
6360 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
6362 && elf_section_data (isec
)->sec_info_type
== ELF_INFO_TYPE_MERGE
6363 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
6365 _bfd_merged_section_offset (output_bfd
, &isec
,
6366 elf_section_data (isec
)->sec_info
,
6367 isym
->st_value
, (bfd_vma
) 0);
6369 else if (isym
->st_shndx
== SHN_ABS
)
6370 isec
= bfd_abs_section_ptr
;
6371 else if (isym
->st_shndx
== SHN_COMMON
)
6372 isec
= bfd_com_section_ptr
;
6381 /* Don't output the first, undefined, symbol. */
6382 if (esym
== external_syms
)
6385 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6387 /* We never output section symbols. Instead, we use the
6388 section symbol of the corresponding section in the output
6393 /* If we are stripping all symbols, we don't want to output this
6395 if (finfo
->info
->strip
== strip_all
)
6398 /* If we are discarding all local symbols, we don't want to
6399 output this one. If we are generating a relocateable output
6400 file, then some of the local symbols may be required by
6401 relocs; we output them below as we discover that they are
6403 if (finfo
->info
->discard
== discard_all
)
6406 /* If this symbol is defined in a section which we are
6407 discarding, we don't need to keep it, but note that
6408 linker_mark is only reliable for sections that have contents.
6409 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6410 as well as linker_mark. */
6411 if ((isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
6413 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
6414 || (! finfo
->info
->relocateable
6415 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
6418 /* Get the name of the symbol. */
6419 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
6424 /* See if we are discarding symbols with this name. */
6425 if ((finfo
->info
->strip
== strip_some
6426 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
6428 || (((finfo
->info
->discard
== discard_sec_merge
6429 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocateable
)
6430 || finfo
->info
->discard
== discard_l
)
6431 && bfd_is_local_label_name (input_bfd
, name
)))
6434 /* If we get here, we are going to output this symbol. */
6438 /* Adjust the section index for the output file. */
6439 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
6440 isec
->output_section
);
6441 if (osym
.st_shndx
== SHN_BAD
)
6444 *pindex
= bfd_get_symcount (output_bfd
);
6446 /* ELF symbols in relocateable files are section relative, but
6447 in executable files they are virtual addresses. Note that
6448 this code assumes that all ELF sections have an associated
6449 BFD section with a reasonable value for output_offset; below
6450 we assume that they also have a reasonable value for
6451 output_section. Any special sections must be set up to meet
6452 these requirements. */
6453 osym
.st_value
+= isec
->output_offset
;
6454 if (! finfo
->info
->relocateable
)
6455 osym
.st_value
+= isec
->output_section
->vma
;
6457 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
6461 /* Relocate the contents of each section. */
6462 sym_hashes
= elf_sym_hashes (input_bfd
);
6463 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
6467 if (! o
->linker_mark
)
6469 /* This section was omitted from the link. */
6473 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
6474 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
6477 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
6479 /* Section was created by elf_link_create_dynamic_sections
6484 /* Get the contents of the section. They have been cached by a
6485 relaxation routine. Note that o is a section in an input
6486 file, so the contents field will not have been set by any of
6487 the routines which work on output files. */
6488 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
6489 contents
= elf_section_data (o
)->this_hdr
.contents
;
6492 contents
= finfo
->contents
;
6493 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
6494 (file_ptr
) 0, o
->_raw_size
))
6498 if ((o
->flags
& SEC_RELOC
) != 0)
6500 Elf_Internal_Rela
*internal_relocs
;
6502 /* Get the swapped relocs. */
6503 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6504 (input_bfd
, o
, finfo
->external_relocs
,
6505 finfo
->internal_relocs
, false));
6506 if (internal_relocs
== NULL
6507 && o
->reloc_count
> 0)
6510 /* Run through the relocs looking for any against symbols
6511 from discarded sections and section symbols from
6512 removed link-once sections. Complain about relocs
6513 against discarded sections. Zero relocs against removed
6514 link-once sections. We should really complain if
6515 anything in the final link tries to use it, but
6516 DWARF-based exception handling might have an entry in
6517 .eh_frame to describe a routine in the linkonce section,
6518 and it turns out to be hard to remove the .eh_frame
6519 entry too. FIXME. */
6520 if (!finfo
->info
->relocateable
6521 && !elf_section_ignore_discarded_relocs (o
))
6523 Elf_Internal_Rela
*rel
, *relend
;
6525 rel
= internal_relocs
;
6526 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6527 for ( ; rel
< relend
; rel
++)
6529 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
6531 if (r_symndx
>= locsymcount
6532 || (elf_bad_symtab (input_bfd
)
6533 && finfo
->sections
[r_symndx
] == NULL
))
6535 struct elf_link_hash_entry
*h
;
6537 h
= sym_hashes
[r_symndx
- extsymoff
];
6538 while (h
->root
.type
== bfd_link_hash_indirect
6539 || h
->root
.type
== bfd_link_hash_warning
)
6540 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6542 /* Complain if the definition comes from a
6543 discarded section. */
6544 if ((h
->root
.type
== bfd_link_hash_defined
6545 || h
->root
.type
== bfd_link_hash_defweak
)
6546 && elf_discarded_section (h
->root
.u
.def
.section
))
6548 #if BFD_VERSION_DATE < 20031005
6549 if ((o
->flags
& SEC_DEBUGGING
) != 0)
6551 #if BFD_VERSION_DATE > 20021005
6552 (*finfo
->info
->callbacks
->warning
)
6554 _("warning: relocation against removed section; zeroing"),
6555 NULL
, input_bfd
, o
, rel
->r_offset
);
6557 BFD_ASSERT (r_symndx
!= 0);
6558 memset (rel
, 0, sizeof (*rel
));
6563 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
6564 (finfo
->info
, h
->root
.root
.string
,
6565 input_bfd
, o
, rel
->r_offset
,
6573 asection
*sec
= finfo
->sections
[r_symndx
];
6575 if (sec
!= NULL
&& elf_discarded_section (sec
))
6577 #if BFD_VERSION_DATE < 20031005
6578 if ((o
->flags
& SEC_DEBUGGING
) != 0
6579 || (sec
->flags
& SEC_LINK_ONCE
) != 0)
6581 #if BFD_VERSION_DATE > 20021005
6582 (*finfo
->info
->callbacks
->warning
)
6584 _("warning: relocation against removed section"),
6585 NULL
, input_bfd
, o
, rel
->r_offset
);
6587 BFD_ASSERT (r_symndx
!= 0);
6589 = ELF_R_INFO (0, ELF_R_TYPE (rel
->r_info
));
6597 = _("local symbols in discarded section %s");
6599 = strlen (sec
->name
) + strlen (msg
) - 1;
6600 char *buf
= (char *) bfd_malloc (amt
);
6603 sprintf (buf
, msg
, sec
->name
);
6605 buf
= (char *) sec
->name
;
6606 ok
= (*finfo
->info
->callbacks
6607 ->undefined_symbol
) (finfo
->info
, buf
,
6611 if (buf
!= sec
->name
)
6621 /* Relocate the section by invoking a back end routine.
6623 The back end routine is responsible for adjusting the
6624 section contents as necessary, and (if using Rela relocs
6625 and generating a relocateable output file) adjusting the
6626 reloc addend as necessary.
6628 The back end routine does not have to worry about setting
6629 the reloc address or the reloc symbol index.
6631 The back end routine is given a pointer to the swapped in
6632 internal symbols, and can access the hash table entries
6633 for the external symbols via elf_sym_hashes (input_bfd).
6635 When generating relocateable output, the back end routine
6636 must handle STB_LOCAL/STT_SECTION symbols specially. The
6637 output symbol is going to be a section symbol
6638 corresponding to the output section, which will require
6639 the addend to be adjusted. */
6641 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
6642 input_bfd
, o
, contents
,
6644 finfo
->internal_syms
,
6650 Elf_Internal_Rela
*irela
;
6651 Elf_Internal_Rela
*irelaend
;
6652 struct elf_link_hash_entry
**rel_hash
;
6653 Elf_Internal_Shdr
*input_rel_hdr
;
6654 unsigned int next_erel
;
6655 void (*reloc_emitter
) PARAMS ((bfd
*, asection
*,
6656 Elf_Internal_Shdr
*,
6657 Elf_Internal_Rela
*));
6659 /* Adjust the reloc addresses and symbol indices. */
6661 irela
= internal_relocs
;
6662 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6663 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
6664 + elf_section_data (o
->output_section
)->rel_count
6665 + elf_section_data (o
->output_section
)->rel_count2
);
6666 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
6668 unsigned long r_symndx
;
6671 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
6677 irela
->r_offset
+= o
->output_offset
;
6679 /* Relocs in an executable have to be virtual addresses. */
6680 if (finfo
->info
->emitrelocations
)
6681 irela
->r_offset
+= o
->output_section
->vma
;
6683 r_symndx
= ELF_R_SYM (irela
->r_info
);
6688 if (r_symndx
>= locsymcount
6689 || (elf_bad_symtab (input_bfd
)
6690 && finfo
->sections
[r_symndx
] == NULL
))
6692 struct elf_link_hash_entry
*rh
;
6695 /* This is a reloc against a global symbol. We
6696 have not yet output all the local symbols, so
6697 we do not know the symbol index of any global
6698 symbol. We set the rel_hash entry for this
6699 reloc to point to the global hash table entry
6700 for this symbol. The symbol index is then
6701 set at the end of elf_bfd_final_link. */
6702 indx
= r_symndx
- extsymoff
;
6703 rh
= elf_sym_hashes (input_bfd
)[indx
];
6704 while (rh
->root
.type
== bfd_link_hash_indirect
6705 || rh
->root
.type
== bfd_link_hash_warning
)
6706 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
6708 /* Setting the index to -2 tells
6709 elf_link_output_extsym that this symbol is
6711 BFD_ASSERT (rh
->indx
< 0);
6719 /* This is a reloc against a local symbol. */
6722 isym
= finfo
->internal_syms
+ r_symndx
;
6723 sec
= finfo
->sections
[r_symndx
];
6724 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6726 /* I suppose the backend ought to fill in the
6727 section of any STT_SECTION symbol against a
6728 processor specific section. If we have
6729 discarded a section, the output_section will
6730 be the absolute section. */
6732 && (bfd_is_abs_section (sec
)
6733 || (sec
->output_section
!= NULL
6734 && bfd_is_abs_section (sec
->output_section
))))
6736 else if (sec
== NULL
|| sec
->owner
== NULL
)
6738 bfd_set_error (bfd_error_bad_value
);
6743 r_symndx
= sec
->output_section
->target_index
;
6744 BFD_ASSERT (r_symndx
!= 0);
6749 if (finfo
->indices
[r_symndx
] == -1)
6751 unsigned long shlink
;
6755 if (finfo
->info
->strip
== strip_all
)
6757 /* You can't do ld -r -s. */
6758 bfd_set_error (bfd_error_invalid_operation
);
6762 /* This symbol was skipped earlier, but
6763 since it is needed by a reloc, we
6764 must output it now. */
6765 shlink
= symtab_hdr
->sh_link
;
6766 name
= (bfd_elf_string_from_elf_section
6767 (input_bfd
, shlink
, isym
->st_name
));
6771 osec
= sec
->output_section
;
6773 _bfd_elf_section_from_bfd_section (output_bfd
,
6775 if (isym
->st_shndx
== SHN_BAD
)
6778 isym
->st_value
+= sec
->output_offset
;
6779 if (! finfo
->info
->relocateable
)
6780 isym
->st_value
+= osec
->vma
;
6782 finfo
->indices
[r_symndx
]
6783 = bfd_get_symcount (output_bfd
);
6785 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
6789 r_symndx
= finfo
->indices
[r_symndx
];
6792 irela
->r_info
= ELF_R_INFO (r_symndx
,
6793 ELF_R_TYPE (irela
->r_info
));
6796 /* Swap out the relocs. */
6797 if (bed
->elf_backend_emit_relocs
6798 && !(finfo
->info
->relocateable
6799 || finfo
->info
->emitrelocations
))
6800 reloc_emitter
= bed
->elf_backend_emit_relocs
;
6802 reloc_emitter
= elf_link_output_relocs
;
6804 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
6805 (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
, internal_relocs
);
6807 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
6810 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
6811 * bed
->s
->int_rels_per_ext_rel
);
6812 reloc_emitter (output_bfd
, o
, input_rel_hdr
, internal_relocs
);
6818 /* Write out the modified section contents. */
6819 if (bed
->elf_backend_write_section
6820 && (*bed
->elf_backend_write_section
) (output_bfd
, o
, contents
))
6822 /* Section written out. */
6824 else switch (elf_section_data (o
)->sec_info_type
)
6826 case ELF_INFO_TYPE_STABS
:
6827 if (! (_bfd_write_section_stabs
6829 &elf_hash_table (finfo
->info
)->stab_info
,
6830 o
, &elf_section_data (o
)->sec_info
, contents
)))
6833 case ELF_INFO_TYPE_MERGE
:
6834 if (! (_bfd_write_merged_section
6835 (output_bfd
, o
, elf_section_data (o
)->sec_info
)))
6838 case ELF_INFO_TYPE_EH_FRAME
:
6843 = bfd_get_section_by_name (elf_hash_table (finfo
->info
)->dynobj
,
6845 if (! (_bfd_elf_write_section_eh_frame (output_bfd
, o
, ehdrsec
,
6852 bfd_size_type sec_size
;
6854 sec_size
= (o
->_cooked_size
!= 0 ? o
->_cooked_size
: o
->_raw_size
);
6855 if (! (o
->flags
& SEC_EXCLUDE
)
6856 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
6858 (file_ptr
) o
->output_offset
,
6869 /* Generate a reloc when linking an ELF file. This is a reloc
6870 requested by the linker, and does come from any input file. This
6871 is used to build constructor and destructor tables when linking
6875 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
6877 struct bfd_link_info
*info
;
6878 asection
*output_section
;
6879 struct bfd_link_order
*link_order
;
6881 reloc_howto_type
*howto
;
6885 struct elf_link_hash_entry
**rel_hash_ptr
;
6886 Elf_Internal_Shdr
*rel_hdr
;
6887 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
6889 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
6892 bfd_set_error (bfd_error_bad_value
);
6896 addend
= link_order
->u
.reloc
.p
->addend
;
6898 /* Figure out the symbol index. */
6899 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
6900 + elf_section_data (output_section
)->rel_count
6901 + elf_section_data (output_section
)->rel_count2
);
6902 if (link_order
->type
== bfd_section_reloc_link_order
)
6904 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
6905 BFD_ASSERT (indx
!= 0);
6906 *rel_hash_ptr
= NULL
;
6910 struct elf_link_hash_entry
*h
;
6912 /* Treat a reloc against a defined symbol as though it were
6913 actually against the section. */
6914 h
= ((struct elf_link_hash_entry
*)
6915 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
6916 link_order
->u
.reloc
.p
->u
.name
,
6917 false, false, true));
6919 && (h
->root
.type
== bfd_link_hash_defined
6920 || h
->root
.type
== bfd_link_hash_defweak
))
6924 section
= h
->root
.u
.def
.section
;
6925 indx
= section
->output_section
->target_index
;
6926 *rel_hash_ptr
= NULL
;
6927 /* It seems that we ought to add the symbol value to the
6928 addend here, but in practice it has already been added
6929 because it was passed to constructor_callback. */
6930 addend
+= section
->output_section
->vma
+ section
->output_offset
;
6934 /* Setting the index to -2 tells elf_link_output_extsym that
6935 this symbol is used by a reloc. */
6942 if (! ((*info
->callbacks
->unattached_reloc
)
6943 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
6944 (asection
*) NULL
, (bfd_vma
) 0)))
6950 /* If this is an inplace reloc, we must write the addend into the
6952 if (howto
->partial_inplace
&& addend
!= 0)
6955 bfd_reloc_status_type rstat
;
6958 const char *sym_name
;
6960 size
= bfd_get_reloc_size (howto
);
6961 buf
= (bfd_byte
*) bfd_zmalloc (size
);
6962 if (buf
== (bfd_byte
*) NULL
)
6964 rstat
= _bfd_relocate_contents (howto
, output_bfd
, (bfd_vma
) addend
, buf
);
6971 case bfd_reloc_outofrange
:
6974 case bfd_reloc_overflow
:
6975 if (link_order
->type
== bfd_section_reloc_link_order
)
6976 sym_name
= bfd_section_name (output_bfd
,
6977 link_order
->u
.reloc
.p
->u
.section
);
6979 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
6980 if (! ((*info
->callbacks
->reloc_overflow
)
6981 (info
, sym_name
, howto
->name
, addend
,
6982 (bfd
*) NULL
, (asection
*) NULL
, (bfd_vma
) 0)))
6989 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
6990 (file_ptr
) link_order
->offset
, size
);
6996 /* The address of a reloc is relative to the section in a
6997 relocateable file, and is a virtual address in an executable
6999 offset
= link_order
->offset
;
7000 if (! info
->relocateable
)
7001 offset
+= output_section
->vma
;
7003 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
7005 if (rel_hdr
->sh_type
== SHT_REL
)
7008 Elf_Internal_Rel
*irel
;
7009 Elf_External_Rel
*erel
;
7012 size
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
7013 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (size
);
7017 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7018 irel
[i
].r_offset
= offset
;
7019 irel
[0].r_info
= ELF_R_INFO (indx
, howto
->type
);
7021 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
7022 + elf_section_data (output_section
)->rel_count
);
7024 if (bed
->s
->swap_reloc_out
)
7025 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, (bfd_byte
*) erel
);
7027 elf_swap_reloc_out (output_bfd
, irel
, erel
);
7034 Elf_Internal_Rela
*irela
;
7035 Elf_External_Rela
*erela
;
7038 size
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
7039 irela
= (Elf_Internal_Rela
*) bfd_zmalloc (size
);
7043 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7044 irela
[i
].r_offset
= offset
;
7045 irela
[0].r_info
= ELF_R_INFO (indx
, howto
->type
);
7046 irela
[0].r_addend
= addend
;
7048 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
7049 + elf_section_data (output_section
)->rel_count
);
7051 if (bed
->s
->swap_reloca_out
)
7052 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (bfd_byte
*) erela
);
7054 elf_swap_reloca_out (output_bfd
, irela
, erela
);
7057 ++elf_section_data (output_section
)->rel_count
;
7062 /* Allocate a pointer to live in a linker created section. */
7065 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
7067 struct bfd_link_info
*info
;
7068 elf_linker_section_t
*lsect
;
7069 struct elf_link_hash_entry
*h
;
7070 const Elf_Internal_Rela
*rel
;
7072 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
7073 elf_linker_section_pointers_t
*linker_section_ptr
;
7074 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7077 BFD_ASSERT (lsect
!= NULL
);
7079 /* Is this a global symbol? */
7082 /* Has this symbol already been allocated? If so, our work is done. */
7083 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
7088 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
7089 /* Make sure this symbol is output as a dynamic symbol. */
7090 if (h
->dynindx
== -1)
7092 if (! elf_link_record_dynamic_symbol (info
, h
))
7096 if (lsect
->rel_section
)
7097 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7101 /* Allocation of a pointer to a local symbol. */
7102 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
7104 /* Allocate a table to hold the local symbols if first time. */
7107 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
7108 register unsigned int i
;
7111 amt
*= sizeof (elf_linker_section_pointers_t
*);
7112 ptr
= (elf_linker_section_pointers_t
**) bfd_alloc (abfd
, amt
);
7117 elf_local_ptr_offsets (abfd
) = ptr
;
7118 for (i
= 0; i
< num_symbols
; i
++)
7119 ptr
[i
] = (elf_linker_section_pointers_t
*) 0;
7122 /* Has this symbol already been allocated? If so, our work is done. */
7123 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
7128 ptr_linker_section_ptr
= &ptr
[r_symndx
];
7132 /* If we are generating a shared object, we need to
7133 output a R_<xxx>_RELATIVE reloc so that the
7134 dynamic linker can adjust this GOT entry. */
7135 BFD_ASSERT (lsect
->rel_section
!= NULL
);
7136 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7140 /* Allocate space for a pointer in the linker section, and allocate
7141 a new pointer record from internal memory. */
7142 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
7143 amt
= sizeof (elf_linker_section_pointers_t
);
7144 linker_section_ptr
= (elf_linker_section_pointers_t
*) bfd_alloc (abfd
, amt
);
7146 if (!linker_section_ptr
)
7149 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
7150 linker_section_ptr
->addend
= rel
->r_addend
;
7151 linker_section_ptr
->which
= lsect
->which
;
7152 linker_section_ptr
->written_address_p
= false;
7153 *ptr_linker_section_ptr
= linker_section_ptr
;
7156 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
7158 linker_section_ptr
->offset
= (lsect
->section
->_raw_size
7159 - lsect
->hole_size
+ (ARCH_SIZE
/ 8));
7160 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
7161 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
7162 if (lsect
->sym_hash
)
7164 /* Bump up symbol value if needed. */
7165 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
7167 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
7168 lsect
->sym_hash
->root
.root
.string
,
7169 (long) ARCH_SIZE
/ 8,
7170 (long) lsect
->sym_hash
->root
.u
.def
.value
);
7176 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
7178 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
7182 "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
7183 lsect
->name
, (long) linker_section_ptr
->offset
,
7184 (long) lsect
->section
->_raw_size
);
7191 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
7194 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
7197 /* Fill in the address for a pointer generated in a linker section. */
7200 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
,
7201 relocation
, rel
, relative_reloc
)
7204 struct bfd_link_info
*info
;
7205 elf_linker_section_t
*lsect
;
7206 struct elf_link_hash_entry
*h
;
7208 const Elf_Internal_Rela
*rel
;
7211 elf_linker_section_pointers_t
*linker_section_ptr
;
7213 BFD_ASSERT (lsect
!= NULL
);
7217 /* Handle global symbol. */
7218 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7219 (h
->linker_section_pointer
,
7223 BFD_ASSERT (linker_section_ptr
!= NULL
);
7225 if (! elf_hash_table (info
)->dynamic_sections_created
7228 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
7230 /* This is actually a static link, or it is a
7231 -Bsymbolic link and the symbol is defined
7232 locally. We must initialize this entry in the
7235 When doing a dynamic link, we create a .rela.<xxx>
7236 relocation entry to initialize the value. This
7237 is done in the finish_dynamic_symbol routine. */
7238 if (!linker_section_ptr
->written_address_p
)
7240 linker_section_ptr
->written_address_p
= true;
7241 bfd_put_ptr (output_bfd
,
7242 relocation
+ linker_section_ptr
->addend
,
7243 (lsect
->section
->contents
7244 + linker_section_ptr
->offset
));
7250 /* Handle local symbol. */
7251 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7252 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
7253 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
7254 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7255 (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
7259 BFD_ASSERT (linker_section_ptr
!= NULL
);
7261 /* Write out pointer if it hasn't been rewritten out before. */
7262 if (!linker_section_ptr
->written_address_p
)
7264 linker_section_ptr
->written_address_p
= true;
7265 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
7266 lsect
->section
->contents
+ linker_section_ptr
->offset
);
7270 asection
*srel
= lsect
->rel_section
;
7271 Elf_Internal_Rela
*outrel
;
7272 Elf_External_Rela
*erel
;
7273 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7277 amt
= sizeof (Elf_Internal_Rela
) * bed
->s
->int_rels_per_ext_rel
;
7278 outrel
= (Elf_Internal_Rela
*) bfd_zmalloc (amt
);
7281 (*_bfd_error_handler
) (_("Error: out of memory"));
7285 /* We need to generate a relative reloc for the dynamic
7289 srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
7291 lsect
->rel_section
= srel
;
7294 BFD_ASSERT (srel
!= NULL
);
7296 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7297 outrel
[i
].r_offset
= (lsect
->section
->output_section
->vma
7298 + lsect
->section
->output_offset
7299 + linker_section_ptr
->offset
);
7300 outrel
[0].r_info
= ELF_R_INFO (0, relative_reloc
);
7301 outrel
[0].r_addend
= 0;
7302 erel
= (Elf_External_Rela
*) lsect
->section
->contents
;
7303 erel
+= elf_section_data (lsect
->section
)->rel_count
;
7304 elf_swap_reloca_out (output_bfd
, outrel
, erel
);
7305 ++elf_section_data (lsect
->section
)->rel_count
;
7312 relocation
= (lsect
->section
->output_offset
7313 + linker_section_ptr
->offset
7314 - lsect
->hole_offset
7315 - lsect
->sym_offset
);
7319 "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
7320 lsect
->name
, (long) relocation
, (long) relocation
);
7323 /* Subtract out the addend, because it will get added back in by the normal
7325 return relocation
- linker_section_ptr
->addend
;
7328 /* Garbage collect unused sections. */
7330 static boolean elf_gc_mark
7331 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
7332 asection
* (*gc_mark_hook
)
7333 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7334 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
7336 static boolean elf_gc_sweep
7337 PARAMS ((struct bfd_link_info
*info
,
7338 boolean (*gc_sweep_hook
)
7339 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
7340 const Elf_Internal_Rela
*relocs
))));
7342 static boolean elf_gc_sweep_symbol
7343 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
7345 static boolean elf_gc_allocate_got_offsets
7346 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
7348 static boolean elf_gc_propagate_vtable_entries_used
7349 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
7351 static boolean elf_gc_smash_unused_vtentry_relocs
7352 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
7354 /* The mark phase of garbage collection. For a given section, mark
7355 it and any sections in this section's group, and all the sections
7356 which define symbols to which it refers. */
7359 elf_gc_mark (info
, sec
, gc_mark_hook
)
7360 struct bfd_link_info
*info
;
7362 asection
* (*gc_mark_hook
)
7363 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7364 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
7367 asection
*group_sec
;
7371 /* Mark all the sections in the group. */
7372 group_sec
= elf_section_data (sec
)->next_in_group
;
7373 if (group_sec
&& !group_sec
->gc_mark
)
7374 if (!elf_gc_mark (info
, group_sec
, gc_mark_hook
))
7377 /* Look through the section relocs. */
7379 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
7381 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
7382 Elf_Internal_Shdr
*symtab_hdr
;
7383 Elf_Internal_Shdr
*shndx_hdr
;
7384 struct elf_link_hash_entry
**sym_hashes
;
7387 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
7388 Elf_External_Sym_Shndx
*locsym_shndx
;
7389 bfd
*input_bfd
= sec
->owner
;
7390 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
7392 /* GCFIXME: how to arrange so that relocs and symbols are not
7393 reread continually? */
7395 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
7396 sym_hashes
= elf_sym_hashes (input_bfd
);
7398 /* Read the local symbols. */
7399 if (elf_bad_symtab (input_bfd
))
7401 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
7405 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
7407 if (symtab_hdr
->contents
)
7408 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
7409 else if (nlocsyms
== 0)
7413 bfd_size_type amt
= nlocsyms
* sizeof (Elf_External_Sym
);
7414 locsyms
= freesyms
= bfd_malloc (amt
);
7415 if (freesyms
== NULL
7416 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
7417 || bfd_bread (locsyms
, amt
, input_bfd
) != amt
)
7424 shndx_hdr
= &elf_tdata (input_bfd
)->symtab_shndx_hdr
;
7425 locsym_shndx
= NULL
;
7426 if (shndx_hdr
->sh_size
!= 0 && nlocsyms
!= 0)
7428 bfd_size_type amt
= nlocsyms
* sizeof (Elf_External_Sym_Shndx
);
7429 locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
7430 if (bfd_seek (input_bfd
, shndx_hdr
->sh_offset
, SEEK_SET
) != 0
7431 || bfd_bread (locsym_shndx
, amt
, input_bfd
) != amt
)
7435 /* Read the relocations. */
7436 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7437 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
7438 info
->keep_memory
));
7439 if (relstart
== NULL
)
7444 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7446 for (rel
= relstart
; rel
< relend
; rel
++)
7448 unsigned long r_symndx
;
7450 struct elf_link_hash_entry
*h
;
7453 r_symndx
= ELF_R_SYM (rel
->r_info
);
7457 if (elf_bad_symtab (sec
->owner
))
7459 elf_swap_symbol_in (input_bfd
,
7461 locsym_shndx
+ (locsym_shndx
? r_symndx
: 0),
7463 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
7464 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, NULL
, &s
);
7467 h
= sym_hashes
[r_symndx
- extsymoff
];
7468 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, h
, NULL
);
7471 else if (r_symndx
>= nlocsyms
)
7473 h
= sym_hashes
[r_symndx
- extsymoff
];
7474 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, h
, NULL
);
7478 elf_swap_symbol_in (input_bfd
,
7480 locsym_shndx
+ (locsym_shndx
? r_symndx
: 0),
7482 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, NULL
, &s
);
7485 if (rsec
&& !rsec
->gc_mark
)
7486 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
7494 if (!info
->keep_memory
)
7504 /* The sweep phase of garbage collection. Remove all garbage sections. */
7507 elf_gc_sweep (info
, gc_sweep_hook
)
7508 struct bfd_link_info
*info
;
7509 boolean (*gc_sweep_hook
)
7510 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
7511 const Elf_Internal_Rela
*relocs
));
7515 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7519 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
7522 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7524 /* Keep special sections. Keep .debug sections. */
7525 if ((o
->flags
& SEC_LINKER_CREATED
)
7526 || (o
->flags
& SEC_DEBUGGING
))
7532 /* Skip sweeping sections already excluded. */
7533 if (o
->flags
& SEC_EXCLUDE
)
7536 /* Since this is early in the link process, it is simple
7537 to remove a section from the output. */
7538 o
->flags
|= SEC_EXCLUDE
;
7540 /* But we also have to update some of the relocation
7541 info we collected before. */
7543 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
7545 Elf_Internal_Rela
*internal_relocs
;
7548 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
7549 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
7550 if (internal_relocs
== NULL
)
7553 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
7555 if (!info
->keep_memory
)
7556 free (internal_relocs
);
7564 /* Remove the symbols that were in the swept sections from the dynamic
7565 symbol table. GCFIXME: Anyone know how to get them out of the
7566 static symbol table as well? */
7570 elf_link_hash_traverse (elf_hash_table (info
),
7571 elf_gc_sweep_symbol
,
7574 elf_hash_table (info
)->dynsymcount
= i
;
7580 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
7583 elf_gc_sweep_symbol (h
, idxptr
)
7584 struct elf_link_hash_entry
*h
;
7587 int *idx
= (int *) idxptr
;
7589 if (h
->dynindx
!= -1
7590 && ((h
->root
.type
!= bfd_link_hash_defined
7591 && h
->root
.type
!= bfd_link_hash_defweak
)
7592 || h
->root
.u
.def
.section
->gc_mark
))
7593 h
->dynindx
= (*idx
)++;
7598 /* Propogate collected vtable information. This is called through
7599 elf_link_hash_traverse. */
7602 elf_gc_propagate_vtable_entries_used (h
, okp
)
7603 struct elf_link_hash_entry
*h
;
7606 /* Those that are not vtables. */
7607 if (h
->vtable_parent
== NULL
)
7610 /* Those vtables that do not have parents, we cannot merge. */
7611 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
7614 /* If we've already been done, exit. */
7615 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
7618 /* Make sure the parent's table is up to date. */
7619 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
7621 if (h
->vtable_entries_used
== NULL
)
7623 /* None of this table's entries were referenced. Re-use the
7625 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
7626 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
7633 /* Or the parent's entries into ours. */
7634 cu
= h
->vtable_entries_used
;
7636 pu
= h
->vtable_parent
->vtable_entries_used
;
7639 asection
*sec
= h
->root
.u
.def
.section
;
7640 struct elf_backend_data
*bed
= get_elf_backend_data (sec
->owner
);
7641 int file_align
= bed
->s
->file_align
;
7643 n
= h
->vtable_parent
->vtable_entries_size
/ file_align
;
7658 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
7659 struct elf_link_hash_entry
*h
;
7663 bfd_vma hstart
, hend
;
7664 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
7665 struct elf_backend_data
*bed
;
7668 /* Take care of both those symbols that do not describe vtables as
7669 well as those that are not loaded. */
7670 if (h
->vtable_parent
== NULL
)
7673 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
7674 || h
->root
.type
== bfd_link_hash_defweak
);
7676 sec
= h
->root
.u
.def
.section
;
7677 hstart
= h
->root
.u
.def
.value
;
7678 hend
= hstart
+ h
->size
;
7680 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7681 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
7683 return *(boolean
*) okp
= false;
7684 bed
= get_elf_backend_data (sec
->owner
);
7685 file_align
= bed
->s
->file_align
;
7687 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7689 for (rel
= relstart
; rel
< relend
; ++rel
)
7690 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
7692 /* If the entry is in use, do nothing. */
7693 if (h
->vtable_entries_used
7694 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
7696 bfd_vma entry
= (rel
->r_offset
- hstart
) / file_align
;
7697 if (h
->vtable_entries_used
[entry
])
7700 /* Otherwise, kill it. */
7701 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
7707 /* Do mark and sweep of unused sections. */
7710 elf_gc_sections (abfd
, info
)
7712 struct bfd_link_info
*info
;
7716 asection
* (*gc_mark_hook
)
7717 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7718 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
7720 if (!get_elf_backend_data (abfd
)->can_gc_sections
7721 || info
->relocateable
|| info
->emitrelocations
7722 || elf_hash_table (info
)->dynamic_sections_created
)
7725 /* Apply transitive closure to the vtable entry usage info. */
7726 elf_link_hash_traverse (elf_hash_table (info
),
7727 elf_gc_propagate_vtable_entries_used
,
7732 /* Kill the vtable relocations that were not used. */
7733 elf_link_hash_traverse (elf_hash_table (info
),
7734 elf_gc_smash_unused_vtentry_relocs
,
7739 /* Grovel through relocs to find out who stays ... */
7741 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
7742 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7746 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
7749 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7751 if (o
->flags
& SEC_KEEP
)
7752 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
7757 /* ... and mark SEC_EXCLUDE for those that go. */
7758 if (!elf_gc_sweep (info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
7764 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
7767 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
7770 struct elf_link_hash_entry
*h
;
7773 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
7774 struct elf_link_hash_entry
**search
, *child
;
7775 bfd_size_type extsymcount
;
7777 /* The sh_info field of the symtab header tells us where the
7778 external symbols start. We don't care about the local symbols at
7780 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
7781 if (!elf_bad_symtab (abfd
))
7782 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
7784 sym_hashes
= elf_sym_hashes (abfd
);
7785 sym_hashes_end
= sym_hashes
+ extsymcount
;
7787 /* Hunt down the child symbol, which is in this section at the same
7788 offset as the relocation. */
7789 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
7791 if ((child
= *search
) != NULL
7792 && (child
->root
.type
== bfd_link_hash_defined
7793 || child
->root
.type
== bfd_link_hash_defweak
)
7794 && child
->root
.u
.def
.section
== sec
7795 && child
->root
.u
.def
.value
== offset
)
7799 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
7800 bfd_archive_filename (abfd
), sec
->name
,
7801 (unsigned long) offset
);
7802 bfd_set_error (bfd_error_invalid_operation
);
7808 /* This *should* only be the absolute section. It could potentially
7809 be that someone has defined a non-global vtable though, which
7810 would be bad. It isn't worth paging in the local symbols to be
7811 sure though; that case should simply be handled by the assembler. */
7813 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
7816 child
->vtable_parent
= h
;
7821 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
7824 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
7825 bfd
*abfd ATTRIBUTE_UNUSED
;
7826 asection
*sec ATTRIBUTE_UNUSED
;
7827 struct elf_link_hash_entry
*h
;
7830 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7831 int file_align
= bed
->s
->file_align
;
7833 if (addend
>= h
->vtable_entries_size
)
7836 boolean
*ptr
= h
->vtable_entries_used
;
7838 /* While the symbol is undefined, we have to be prepared to handle
7840 if (h
->root
.type
== bfd_link_hash_undefined
)
7847 /* Oops! We've got a reference past the defined end of
7848 the table. This is probably a bug -- shall we warn? */
7853 /* Allocate one extra entry for use as a "done" flag for the
7854 consolidation pass. */
7855 bytes
= (size
/ file_align
+ 1) * sizeof (boolean
);
7859 ptr
= bfd_realloc (ptr
- 1, (bfd_size_type
) bytes
);
7865 oldbytes
= ((h
->vtable_entries_size
/ file_align
+ 1)
7866 * sizeof (boolean
));
7867 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
7871 ptr
= bfd_zmalloc ((bfd_size_type
) bytes
);
7876 /* And arrange for that done flag to be at index -1. */
7877 h
->vtable_entries_used
= ptr
+ 1;
7878 h
->vtable_entries_size
= size
;
7881 h
->vtable_entries_used
[addend
/ file_align
] = true;
7886 /* And an accompanying bit to work out final got entry offsets once
7887 we're done. Should be called from final_link. */
7890 elf_gc_common_finalize_got_offsets (abfd
, info
)
7892 struct bfd_link_info
*info
;
7895 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7898 /* The GOT offset is relative to the .got section, but the GOT header is
7899 put into the .got.plt section, if the backend uses it. */
7900 if (bed
->want_got_plt
)
7903 gotoff
= bed
->got_header_size
;
7905 /* Do the local .got entries first. */
7906 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
7908 bfd_signed_vma
*local_got
;
7909 bfd_size_type j
, locsymcount
;
7910 Elf_Internal_Shdr
*symtab_hdr
;
7912 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
7915 local_got
= elf_local_got_refcounts (i
);
7919 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
7920 if (elf_bad_symtab (i
))
7921 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
7923 locsymcount
= symtab_hdr
->sh_info
;
7925 for (j
= 0; j
< locsymcount
; ++j
)
7927 if (local_got
[j
] > 0)
7929 local_got
[j
] = gotoff
;
7930 gotoff
+= ARCH_SIZE
/ 8;
7933 local_got
[j
] = (bfd_vma
) -1;
7937 /* Then the global .got entries. .plt refcounts are handled by
7938 adjust_dynamic_symbol */
7939 elf_link_hash_traverse (elf_hash_table (info
),
7940 elf_gc_allocate_got_offsets
,
7945 /* We need a special top-level link routine to convert got reference counts
7946 to real got offsets. */
7949 elf_gc_allocate_got_offsets (h
, offarg
)
7950 struct elf_link_hash_entry
*h
;
7953 bfd_vma
*off
= (bfd_vma
*) offarg
;
7955 if (h
->got
.refcount
> 0)
7957 h
->got
.offset
= off
[0];
7958 off
[0] += ARCH_SIZE
/ 8;
7961 h
->got
.offset
= (bfd_vma
) -1;
7966 /* Many folk need no more in the way of final link than this, once
7967 got entry reference counting is enabled. */
7970 elf_gc_common_final_link (abfd
, info
)
7972 struct bfd_link_info
*info
;
7974 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
7977 /* Invoke the regular ELF backend linker to do all the work. */
7978 return elf_bfd_final_link (abfd
, info
);
7981 /* This function will be called though elf_link_hash_traverse to store
7982 all hash value of the exported symbols in an array. */
7985 elf_collect_hash_codes (h
, data
)
7986 struct elf_link_hash_entry
*h
;
7989 unsigned long **valuep
= (unsigned long **) data
;
7995 /* Ignore indirect symbols. These are added by the versioning code. */
7996 if (h
->dynindx
== -1)
7999 name
= h
->root
.root
.string
;
8000 p
= strchr (name
, ELF_VER_CHR
);
8003 alc
= bfd_malloc ((bfd_size_type
) (p
- name
+ 1));
8004 memcpy (alc
, name
, (size_t) (p
- name
));
8005 alc
[p
- name
] = '\0';
8009 /* Compute the hash value. */
8010 ha
= bfd_elf_hash (name
);
8012 /* Store the found hash value in the array given as the argument. */
8015 /* And store it in the struct so that we can put it in the hash table
8017 h
->elf_hash_value
= ha
;
8026 elf_reloc_symbol_deleted_p (offset
, cookie
)
8030 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
8032 if (rcookie
->bad_symtab
)
8033 rcookie
->rel
= rcookie
->rels
;
8035 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
8037 unsigned long r_symndx
= ELF_R_SYM (rcookie
->rel
->r_info
);
8038 Elf_Internal_Sym isym
;
8040 if (! rcookie
->bad_symtab
)
8041 if (rcookie
->rel
->r_offset
> offset
)
8043 if (rcookie
->rel
->r_offset
!= offset
)
8046 if (rcookie
->locsyms
&& r_symndx
< rcookie
->locsymcount
)
8048 Elf_External_Sym
*lsym
;
8049 Elf_External_Sym_Shndx
*lshndx
;
8051 lsym
= (Elf_External_Sym
*) rcookie
->locsyms
+ r_symndx
;
8052 lshndx
= (Elf_External_Sym_Shndx
*) rcookie
->locsym_shndx
;
8055 elf_swap_symbol_in (rcookie
->abfd
, lsym
, lshndx
, &isym
);
8058 if (r_symndx
>= rcookie
->locsymcount
8059 || (rcookie
->locsyms
8060 && ELF_ST_BIND (isym
.st_info
) != STB_LOCAL
))
8062 struct elf_link_hash_entry
*h
;
8064 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
8066 while (h
->root
.type
== bfd_link_hash_indirect
8067 || h
->root
.type
== bfd_link_hash_warning
)
8068 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8070 if ((h
->root
.type
== bfd_link_hash_defined
8071 || h
->root
.type
== bfd_link_hash_defweak
)
8072 && elf_discarded_section (h
->root
.u
.def
.section
))
8077 else if (rcookie
->locsyms
)
8079 /* It's not a relocation against a global symbol,
8080 but it could be a relocation against a local
8081 symbol for a discarded section. */
8084 /* Need to: get the symbol; get the section. */
8085 if (isym
.st_shndx
< SHN_LORESERVE
|| isym
.st_shndx
> SHN_HIRESERVE
)
8087 isec
= section_from_elf_index (rcookie
->abfd
, isym
.st_shndx
);
8088 if (isec
!= NULL
&& elf_discarded_section (isec
))
8097 /* Discard unneeded references to discarded sections.
8098 Returns true if any section's size was changed. */
8099 /* This function assumes that the relocations are in sorted order,
8100 which is true for all known assemblers. */
8103 elf_bfd_discard_info (output_bfd
, info
)
8105 struct bfd_link_info
*info
;
8107 struct elf_reloc_cookie cookie
;
8108 asection
*stab
, *eh
, *ehdr
;
8109 Elf_Internal_Shdr
*symtab_hdr
;
8110 Elf_Internal_Shdr
*shndx_hdr
;
8111 Elf_External_Sym
*freesyms
;
8112 struct elf_backend_data
*bed
;
8114 boolean ret
= false;
8115 boolean strip
= info
->strip
== strip_all
|| info
->strip
== strip_debugger
;
8117 if (info
->relocateable
8118 || info
->traditional_format
8119 || info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
8120 || ! is_elf_hash_table (info
))
8124 if (elf_hash_table (info
)->dynobj
!= NULL
)
8125 ehdr
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
8128 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
8130 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
8133 bed
= get_elf_backend_data (abfd
);
8135 if ((abfd
->flags
& DYNAMIC
) != 0)
8141 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
8142 if (eh
&& eh
->_raw_size
== 0)
8146 stab
= strip
? NULL
: bfd_get_section_by_name (abfd
, ".stab");
8147 if ((! stab
|| elf_section_data(stab
)->sec_info_type
!= ELF_INFO_TYPE_STABS
)
8149 && (strip
|| ! bed
->elf_backend_discard_info
))
8152 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8153 shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
8156 cookie
.sym_hashes
= elf_sym_hashes (abfd
);
8157 cookie
.bad_symtab
= elf_bad_symtab (abfd
);
8158 if (cookie
.bad_symtab
)
8160 cookie
.locsymcount
=
8161 symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
8162 cookie
.extsymoff
= 0;
8166 cookie
.locsymcount
= symtab_hdr
->sh_info
;
8167 cookie
.extsymoff
= symtab_hdr
->sh_info
;
8171 if (symtab_hdr
->contents
)
8172 cookie
.locsyms
= (void *) symtab_hdr
->contents
;
8173 else if (cookie
.locsymcount
== 0)
8174 cookie
.locsyms
= NULL
;
8177 bfd_size_type amt
= cookie
.locsymcount
* sizeof (Elf_External_Sym
);
8178 cookie
.locsyms
= bfd_malloc (amt
);
8179 if (cookie
.locsyms
== NULL
)
8181 freesyms
= cookie
.locsyms
;
8182 if (bfd_seek (abfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
8183 || bfd_bread (cookie
.locsyms
, amt
, abfd
) != amt
)
8186 free (cookie
.locsyms
);
8191 cookie
.locsym_shndx
= NULL
;
8192 if (shndx_hdr
->sh_size
!= 0 && cookie
.locsymcount
!= 0)
8195 amt
= cookie
.locsymcount
* sizeof (Elf_External_Sym_Shndx
);
8196 cookie
.locsym_shndx
= bfd_malloc (amt
);
8197 if (cookie
.locsym_shndx
== NULL
)
8198 goto error_ret_free_loc
;
8199 if (bfd_seek (abfd
, shndx_hdr
->sh_offset
, SEEK_SET
) != 0
8200 || bfd_bread (cookie
.locsym_shndx
, amt
, abfd
) != amt
)
8202 free (cookie
.locsym_shndx
);
8203 goto error_ret_free_loc
;
8209 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8210 (abfd
, stab
, (PTR
) NULL
,
8211 (Elf_Internal_Rela
*) NULL
,
8212 info
->keep_memory
));
8215 cookie
.rel
= cookie
.rels
;
8217 cookie
.rels
+ stab
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8218 if (_bfd_discard_section_stabs (abfd
, stab
,
8219 elf_section_data (stab
)->sec_info
,
8220 elf_reloc_symbol_deleted_p
,
8223 if (! info
->keep_memory
)
8232 cookie
.relend
= NULL
;
8233 if (eh
->reloc_count
)
8234 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8235 (abfd
, eh
, (PTR
) NULL
,
8236 (Elf_Internal_Rela
*) NULL
,
8237 info
->keep_memory
));
8240 cookie
.rel
= cookie
.rels
;
8242 cookie
.rels
+ eh
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8244 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
, ehdr
,
8245 elf_reloc_symbol_deleted_p
,
8248 if (! info
->keep_memory
)
8252 if (bed
->elf_backend_discard_info
)
8254 if (bed
->elf_backend_discard_info (abfd
, &cookie
, info
))
8258 if (cookie
.locsym_shndx
!= NULL
)
8259 free (cookie
.locsym_shndx
);
8261 if (freesyms
!= NULL
)
8266 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
,
8273 elf_section_ignore_discarded_relocs (sec
)
8276 switch (elf_section_data (sec
)->sec_info_type
)
8278 case ELF_INFO_TYPE_STABS
:
8279 case ELF_INFO_TYPE_EH_FRAME
:
8284 if ((get_elf_backend_data (sec
->owner
)->elf_backend_ignore_discarded_relocs
8286 && (*get_elf_backend_data (sec
->owner
)
8287 ->elf_backend_ignore_discarded_relocs
) (sec
))