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 if (bfd_get_section_by_name (output_bfd
, ".preinit_array") != NULL
)
3205 /* DT_PREINIT_ARRAY is not allowed in shared library. */
3211 for (sub
= info
->input_bfds
; sub
!= NULL
;
3212 sub
= sub
->link_next
)
3213 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
3214 if (elf_section_data (o
)->this_hdr
.sh_type
3215 == SHT_PREINIT_ARRAY
)
3217 (*_bfd_error_handler
)
3218 (_("%s: .preinit_array section is not allowed in DSO"),
3219 bfd_archive_filename (sub
));
3226 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_PREINIT_ARRAY
,
3228 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_PREINIT_ARRAYSZ
,
3232 if (bfd_get_section_by_name (output_bfd
, ".init_array") != NULL
)
3234 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT_ARRAY
,
3236 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_INIT_ARRAYSZ
,
3240 if (bfd_get_section_by_name (output_bfd
, ".fini_array") != NULL
)
3242 if (!elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI_ARRAY
,
3244 || !elf_add_dynamic_entry (info
, (bfd_vma
) DT_FINI_ARRAYSZ
,
3249 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
3250 /* If .dynstr is excluded from the link, we don't want any of
3251 these tags. Strictly, we should be checking each section
3252 individually; This quick check covers for the case where
3253 someone does a /DISCARD/ : { *(*) }. */
3254 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
3256 bfd_size_type strsize
;
3258 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3259 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_HASH
, (bfd_vma
) 0)
3260 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRTAB
, (bfd_vma
) 0)
3261 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMTAB
, (bfd_vma
) 0)
3262 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_STRSZ
, strsize
)
3263 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_SYMENT
,
3264 (bfd_vma
) sizeof (Elf_External_Sym
)))
3269 /* The backend must work out the sizes of all the other dynamic
3271 if (bed
->elf_backend_size_dynamic_sections
3272 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
3275 if (elf_hash_table (info
)->dynamic_sections_created
)
3277 bfd_size_type dynsymcount
;
3279 size_t bucketcount
= 0;
3280 size_t hash_entry_size
;
3281 unsigned int dtagcount
;
3283 /* Set up the version definition section. */
3284 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3285 BFD_ASSERT (s
!= NULL
);
3287 /* We may have created additional version definitions if we are
3288 just linking a regular application. */
3289 verdefs
= asvinfo
.verdefs
;
3291 /* Skip anonymous version tag. */
3292 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
3293 verdefs
= verdefs
->next
;
3295 if (verdefs
== NULL
)
3296 _bfd_strip_section_from_output (info
, s
);
3301 struct bfd_elf_version_tree
*t
;
3303 Elf_Internal_Verdef def
;
3304 Elf_Internal_Verdaux defaux
;
3309 /* Make space for the base version. */
3310 size
+= sizeof (Elf_External_Verdef
);
3311 size
+= sizeof (Elf_External_Verdaux
);
3314 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3316 struct bfd_elf_version_deps
*n
;
3318 size
+= sizeof (Elf_External_Verdef
);
3319 size
+= sizeof (Elf_External_Verdaux
);
3322 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3323 size
+= sizeof (Elf_External_Verdaux
);
3326 s
->_raw_size
= size
;
3327 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3328 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3331 /* Fill in the version definition section. */
3335 def
.vd_version
= VER_DEF_CURRENT
;
3336 def
.vd_flags
= VER_FLG_BASE
;
3339 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3340 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3341 + sizeof (Elf_External_Verdaux
));
3343 if (soname_indx
!= (bfd_size_type
) -1)
3345 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3347 def
.vd_hash
= bfd_elf_hash (soname
);
3348 defaux
.vda_name
= soname_indx
;
3355 name
= basename (output_bfd
->filename
);
3356 def
.vd_hash
= bfd_elf_hash (name
);
3357 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3359 if (indx
== (bfd_size_type
) -1)
3361 defaux
.vda_name
= indx
;
3363 defaux
.vda_next
= 0;
3365 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3366 (Elf_External_Verdef
*) p
);
3367 p
+= sizeof (Elf_External_Verdef
);
3368 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3369 (Elf_External_Verdaux
*) p
);
3370 p
+= sizeof (Elf_External_Verdaux
);
3372 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
3375 struct bfd_elf_version_deps
*n
;
3376 struct elf_link_hash_entry
*h
;
3379 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3382 /* Add a symbol representing this version. */
3384 if (! (_bfd_generic_link_add_one_symbol
3385 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3386 (bfd_vma
) 0, (const char *) NULL
, false,
3387 get_elf_backend_data (dynobj
)->collect
,
3388 (struct bfd_link_hash_entry
**) &h
)))
3390 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3391 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3392 h
->type
= STT_OBJECT
;
3393 h
->verinfo
.vertree
= t
;
3395 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3398 def
.vd_version
= VER_DEF_CURRENT
;
3400 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3401 def
.vd_flags
|= VER_FLG_WEAK
;
3402 def
.vd_ndx
= t
->vernum
+ 1;
3403 def
.vd_cnt
= cdeps
+ 1;
3404 def
.vd_hash
= bfd_elf_hash (t
->name
);
3405 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3406 if (t
->next
!= NULL
)
3407 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3408 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3412 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3413 (Elf_External_Verdef
*) p
);
3414 p
+= sizeof (Elf_External_Verdef
);
3416 defaux
.vda_name
= h
->dynstr_index
;
3417 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3419 if (t
->deps
== NULL
)
3420 defaux
.vda_next
= 0;
3422 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3423 t
->name_indx
= defaux
.vda_name
;
3425 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3426 (Elf_External_Verdaux
*) p
);
3427 p
+= sizeof (Elf_External_Verdaux
);
3429 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3431 if (n
->version_needed
== NULL
)
3433 /* This can happen if there was an error in the
3435 defaux
.vda_name
= 0;
3439 defaux
.vda_name
= n
->version_needed
->name_indx
;
3440 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
3443 if (n
->next
== NULL
)
3444 defaux
.vda_next
= 0;
3446 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3448 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3449 (Elf_External_Verdaux
*) p
);
3450 p
+= sizeof (Elf_External_Verdaux
);
3454 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEF
, (bfd_vma
) 0)
3455 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERDEFNUM
,
3459 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3462 if (info
->new_dtags
&& info
->flags
)
3464 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS
, info
->flags
))
3471 info
->flags_1
&= ~ (DF_1_INITFIRST
3474 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_FLAGS_1
,
3479 /* Work out the size of the version reference section. */
3481 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3482 BFD_ASSERT (s
!= NULL
);
3484 struct elf_find_verdep_info sinfo
;
3486 sinfo
.output_bfd
= output_bfd
;
3488 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3489 if (sinfo
.vers
== 0)
3491 sinfo
.failed
= false;
3493 elf_link_hash_traverse (elf_hash_table (info
),
3494 elf_link_find_version_dependencies
,
3497 if (elf_tdata (output_bfd
)->verref
== NULL
)
3498 _bfd_strip_section_from_output (info
, s
);
3501 Elf_Internal_Verneed
*t
;
3506 /* Build the version definition section. */
3509 for (t
= elf_tdata (output_bfd
)->verref
;
3513 Elf_Internal_Vernaux
*a
;
3515 size
+= sizeof (Elf_External_Verneed
);
3517 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3518 size
+= sizeof (Elf_External_Vernaux
);
3521 s
->_raw_size
= size
;
3522 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3523 if (s
->contents
== NULL
)
3527 for (t
= elf_tdata (output_bfd
)->verref
;
3532 Elf_Internal_Vernaux
*a
;
3536 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3539 t
->vn_version
= VER_NEED_CURRENT
;
3541 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3542 elf_dt_name (t
->vn_bfd
) != NULL
3543 ? elf_dt_name (t
->vn_bfd
)
3544 : basename (t
->vn_bfd
->filename
),
3546 if (indx
== (bfd_size_type
) -1)
3549 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3550 if (t
->vn_nextref
== NULL
)
3553 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3554 + caux
* sizeof (Elf_External_Vernaux
));
3556 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3557 (Elf_External_Verneed
*) p
);
3558 p
+= sizeof (Elf_External_Verneed
);
3560 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3562 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3563 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
3564 a
->vna_nodename
, false);
3565 if (indx
== (bfd_size_type
) -1)
3568 if (a
->vna_nextptr
== NULL
)
3571 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3573 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3574 (Elf_External_Vernaux
*) p
);
3575 p
+= sizeof (Elf_External_Vernaux
);
3579 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEED
,
3581 || ! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERNEEDNUM
,
3585 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3589 /* Assign dynsym indicies. In a shared library we generate a
3590 section symbol for each output section, which come first.
3591 Next come all of the back-end allocated local dynamic syms,
3592 followed by the rest of the global symbols. */
3594 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3596 /* Work out the size of the symbol version section. */
3597 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3598 BFD_ASSERT (s
!= NULL
);
3599 if (dynsymcount
== 0
3600 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3602 _bfd_strip_section_from_output (info
, s
);
3603 /* The DYNSYMCOUNT might have changed if we were going to
3604 output a dynamic symbol table entry for S. */
3605 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3609 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3610 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3611 if (s
->contents
== NULL
)
3614 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_VERSYM
, (bfd_vma
) 0))
3618 /* Set the size of the .dynsym and .hash sections. We counted
3619 the number of dynamic symbols in elf_link_add_object_symbols.
3620 We will build the contents of .dynsym and .hash when we build
3621 the final symbol table, because until then we do not know the
3622 correct value to give the symbols. We built the .dynstr
3623 section as we went along in elf_link_add_object_symbols. */
3624 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3625 BFD_ASSERT (s
!= NULL
);
3626 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3627 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3628 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3631 if (dynsymcount
!= 0)
3633 Elf_Internal_Sym isym
;
3635 /* The first entry in .dynsym is a dummy symbol. */
3642 elf_swap_symbol_out (output_bfd
, &isym
, (PTR
) s
->contents
, (PTR
) 0);
3645 /* Compute the size of the hashing table. As a side effect this
3646 computes the hash values for all the names we export. */
3647 bucketcount
= compute_bucket_count (info
);
3649 s
= bfd_get_section_by_name (dynobj
, ".hash");
3650 BFD_ASSERT (s
!= NULL
);
3651 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3652 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3653 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3654 if (s
->contents
== NULL
)
3656 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3658 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) bucketcount
,
3660 bfd_put (8 * hash_entry_size
, output_bfd
, (bfd_vma
) dynsymcount
,
3661 s
->contents
+ hash_entry_size
);
3663 elf_hash_table (info
)->bucketcount
= bucketcount
;
3665 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3666 BFD_ASSERT (s
!= NULL
);
3668 elf_finalize_dynstr (output_bfd
, info
);
3670 s
->_raw_size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
3672 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
3673 if (! elf_add_dynamic_entry (info
, (bfd_vma
) DT_NULL
, (bfd_vma
) 0))
3680 /* This function is used to adjust offsets into .dynstr for
3681 dynamic symbols. This is called via elf_link_hash_traverse. */
3683 static boolean elf_adjust_dynstr_offsets
3684 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3687 elf_adjust_dynstr_offsets (h
, data
)
3688 struct elf_link_hash_entry
*h
;
3691 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3693 if (h
->dynindx
!= -1)
3694 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3698 /* Assign string offsets in .dynstr, update all structures referencing
3702 elf_finalize_dynstr (output_bfd
, info
)
3704 struct bfd_link_info
*info
;
3706 struct elf_link_local_dynamic_entry
*entry
;
3707 struct elf_strtab_hash
*dynstr
= elf_hash_table (info
)->dynstr
;
3708 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
3711 Elf_External_Dyn
*dyncon
, *dynconend
;
3713 _bfd_elf_strtab_finalize (dynstr
);
3714 size
= _bfd_elf_strtab_size (dynstr
);
3716 /* Update all .dynamic entries referencing .dynstr strings. */
3717 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3718 BFD_ASSERT (sdyn
!= NULL
);
3720 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
3721 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
3723 for (; dyncon
< dynconend
; dyncon
++)
3725 Elf_Internal_Dyn dyn
;
3727 elf_swap_dyn_in (dynobj
, dyncon
, & dyn
);
3731 dyn
.d_un
.d_val
= size
;
3732 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3740 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3741 elf_swap_dyn_out (dynobj
, & dyn
, dyncon
);
3748 /* Now update local dynamic symbols. */
3749 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
3750 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3751 entry
->isym
.st_name
);
3753 /* And the rest of dynamic symbols. */
3754 elf_link_hash_traverse (elf_hash_table (info
),
3755 elf_adjust_dynstr_offsets
, dynstr
);
3757 /* Adjust version definitions. */
3758 if (elf_tdata (output_bfd
)->cverdefs
)
3763 Elf_Internal_Verdef def
;
3764 Elf_Internal_Verdaux defaux
;
3766 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3767 p
= (bfd_byte
*) s
->contents
;
3770 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3772 p
+= sizeof (Elf_External_Verdef
);
3773 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3775 _bfd_elf_swap_verdaux_in (output_bfd
,
3776 (Elf_External_Verdaux
*) p
, &defaux
);
3777 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3779 _bfd_elf_swap_verdaux_out (output_bfd
,
3780 &defaux
, (Elf_External_Verdaux
*) p
);
3781 p
+= sizeof (Elf_External_Verdaux
);
3784 while (def
.vd_next
);
3787 /* Adjust version references. */
3788 if (elf_tdata (output_bfd
)->verref
)
3793 Elf_Internal_Verneed need
;
3794 Elf_Internal_Vernaux needaux
;
3796 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3797 p
= (bfd_byte
*) s
->contents
;
3800 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3802 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3803 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3804 (Elf_External_Verneed
*) p
);
3805 p
+= sizeof (Elf_External_Verneed
);
3806 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3808 _bfd_elf_swap_vernaux_in (output_bfd
,
3809 (Elf_External_Vernaux
*) p
, &needaux
);
3810 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3812 _bfd_elf_swap_vernaux_out (output_bfd
,
3814 (Elf_External_Vernaux
*) p
);
3815 p
+= sizeof (Elf_External_Vernaux
);
3818 while (need
.vn_next
);
3824 /* Fix up the flags for a symbol. This handles various cases which
3825 can only be fixed after all the input files are seen. This is
3826 currently called by both adjust_dynamic_symbol and
3827 assign_sym_version, which is unnecessary but perhaps more robust in
3828 the face of future changes. */
3831 elf_fix_symbol_flags (h
, eif
)
3832 struct elf_link_hash_entry
*h
;
3833 struct elf_info_failed
*eif
;
3835 /* If this symbol was mentioned in a non-ELF file, try to set
3836 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3837 permit a non-ELF file to correctly refer to a symbol defined in
3838 an ELF dynamic object. */
3839 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3841 while (h
->root
.type
== bfd_link_hash_indirect
)
3842 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3844 if (h
->root
.type
!= bfd_link_hash_defined
3845 && h
->root
.type
!= bfd_link_hash_defweak
)
3846 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3847 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3850 if (h
->root
.u
.def
.section
->owner
!= NULL
3851 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3852 == bfd_target_elf_flavour
))
3853 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3854 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3856 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3859 if (h
->dynindx
== -1
3860 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3861 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3863 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3872 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3873 was first seen in a non-ELF file. Fortunately, if the symbol
3874 was first seen in an ELF file, we're probably OK unless the
3875 symbol was defined in a non-ELF file. Catch that case here.
3876 FIXME: We're still in trouble if the symbol was first seen in
3877 a dynamic object, and then later in a non-ELF regular object. */
3878 if ((h
->root
.type
== bfd_link_hash_defined
3879 || h
->root
.type
== bfd_link_hash_defweak
)
3880 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3881 && (h
->root
.u
.def
.section
->owner
!= NULL
3882 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3883 != bfd_target_elf_flavour
)
3884 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3885 && (h
->elf_link_hash_flags
3886 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3887 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3890 /* If this is a final link, and the symbol was defined as a common
3891 symbol in a regular object file, and there was no definition in
3892 any dynamic object, then the linker will have allocated space for
3893 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3894 flag will not have been set. */
3895 if (h
->root
.type
== bfd_link_hash_defined
3896 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3897 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3898 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3899 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3900 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3902 /* If -Bsymbolic was used (which means to bind references to global
3903 symbols to the definition within the shared object), and this
3904 symbol was defined in a regular object, then it actually doesn't
3905 need a PLT entry, and we can accomplish that by forcing it local.
3906 Likewise, if the symbol has hidden or internal visibility.
3907 FIXME: It might be that we also do not need a PLT for other
3908 non-hidden visibilities, but we would have to tell that to the
3909 backend specifically; we can't just clear PLT-related data here. */
3910 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3911 && eif
->info
->shared
3912 && is_elf_hash_table (eif
->info
)
3913 && (eif
->info
->symbolic
3914 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3915 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
3916 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3918 struct elf_backend_data
*bed
;
3919 boolean force_local
;
3921 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3923 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3924 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
3925 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
3928 /* If this is a weak defined symbol in a dynamic object, and we know
3929 the real definition in the dynamic object, copy interesting flags
3930 over to the real definition. */
3931 if (h
->weakdef
!= NULL
)
3933 struct elf_link_hash_entry
*weakdef
;
3935 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3936 || h
->root
.type
== bfd_link_hash_defweak
);
3937 weakdef
= h
->weakdef
;
3938 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3939 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3940 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3942 /* If the real definition is defined by a regular object file,
3943 don't do anything special. See the longer description in
3944 elf_adjust_dynamic_symbol, below. */
3945 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3949 struct elf_backend_data
*bed
;
3951 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3952 (*bed
->elf_backend_copy_indirect_symbol
) (weakdef
, h
);
3959 /* Make the backend pick a good value for a dynamic symbol. This is
3960 called via elf_link_hash_traverse, and also calls itself
3964 elf_adjust_dynamic_symbol (h
, data
)
3965 struct elf_link_hash_entry
*h
;
3968 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3970 struct elf_backend_data
*bed
;
3972 /* Ignore indirect symbols. These are added by the versioning code. */
3973 if (h
->root
.type
== bfd_link_hash_indirect
)
3976 if (! is_elf_hash_table (eif
->info
))
3979 /* Fix the symbol flags. */
3980 if (! elf_fix_symbol_flags (h
, eif
))
3983 /* If this symbol does not require a PLT entry, and it is not
3984 defined by a dynamic object, or is not referenced by a regular
3985 object, ignore it. We do have to handle a weak defined symbol,
3986 even if no regular object refers to it, if we decided to add it
3987 to the dynamic symbol table. FIXME: Do we normally need to worry
3988 about symbols which are defined by one dynamic object and
3989 referenced by another one? */
3990 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3991 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3992 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3993 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3994 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3996 h
->plt
.offset
= (bfd_vma
) -1;
4000 /* If we've already adjusted this symbol, don't do it again. This
4001 can happen via a recursive call. */
4002 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
4005 /* Don't look at this symbol again. Note that we must set this
4006 after checking the above conditions, because we may look at a
4007 symbol once, decide not to do anything, and then get called
4008 recursively later after REF_REGULAR is set below. */
4009 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
4011 /* If this is a weak definition, and we know a real definition, and
4012 the real symbol is not itself defined by a regular object file,
4013 then get a good value for the real definition. We handle the
4014 real symbol first, for the convenience of the backend routine.
4016 Note that there is a confusing case here. If the real definition
4017 is defined by a regular object file, we don't get the real symbol
4018 from the dynamic object, but we do get the weak symbol. If the
4019 processor backend uses a COPY reloc, then if some routine in the
4020 dynamic object changes the real symbol, we will not see that
4021 change in the corresponding weak symbol. This is the way other
4022 ELF linkers work as well, and seems to be a result of the shared
4025 I will clarify this issue. Most SVR4 shared libraries define the
4026 variable _timezone and define timezone as a weak synonym. The
4027 tzset call changes _timezone. If you write
4028 extern int timezone;
4030 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
4031 you might expect that, since timezone is a synonym for _timezone,
4032 the same number will print both times. However, if the processor
4033 backend uses a COPY reloc, then actually timezone will be copied
4034 into your process image, and, since you define _timezone
4035 yourself, _timezone will not. Thus timezone and _timezone will
4036 wind up at different memory locations. The tzset call will set
4037 _timezone, leaving timezone unchanged. */
4039 if (h
->weakdef
!= NULL
)
4041 /* If we get to this point, we know there is an implicit
4042 reference by a regular object file via the weak symbol H.
4043 FIXME: Is this really true? What if the traversal finds
4044 H->WEAKDEF before it finds H? */
4045 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
4047 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
4051 /* If a symbol has no type and no size and does not require a PLT
4052 entry, then we are probably about to do the wrong thing here: we
4053 are probably going to create a COPY reloc for an empty object.
4054 This case can arise when a shared object is built with assembly
4055 code, and the assembly code fails to set the symbol type. */
4057 && h
->type
== STT_NOTYPE
4058 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
4059 (*_bfd_error_handler
)
4060 (_("warning: type and size of dynamic symbol `%s' are not defined"),
4061 h
->root
.root
.string
);
4063 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
4064 bed
= get_elf_backend_data (dynobj
);
4065 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
4074 /* This routine is used to export all defined symbols into the dynamic
4075 symbol table. It is called via elf_link_hash_traverse. */
4078 elf_export_symbol (h
, data
)
4079 struct elf_link_hash_entry
*h
;
4082 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
4084 /* Ignore indirect symbols. These are added by the versioning code. */
4085 if (h
->root
.type
== bfd_link_hash_indirect
)
4088 if (h
->dynindx
== -1
4089 && (h
->elf_link_hash_flags
4090 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
4092 struct bfd_elf_version_tree
*t
;
4093 struct bfd_elf_version_expr
*d
;
4095 for (t
= eif
->verdefs
; t
!= NULL
; t
= t
->next
)
4097 if (t
->globals
!= NULL
)
4099 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4101 if ((*d
->match
) (d
, h
->root
.root
.string
))
4106 if (t
->locals
!= NULL
)
4108 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4110 if ((*d
->match
) (d
, h
->root
.root
.string
))
4119 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
4130 /* Look through the symbols which are defined in other shared
4131 libraries and referenced here. Update the list of version
4132 dependencies. This will be put into the .gnu.version_r section.
4133 This function is called via elf_link_hash_traverse. */
4136 elf_link_find_version_dependencies (h
, data
)
4137 struct elf_link_hash_entry
*h
;
4140 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
4141 Elf_Internal_Verneed
*t
;
4142 Elf_Internal_Vernaux
*a
;
4145 /* We only care about symbols defined in shared objects with version
4147 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
4148 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
4150 || h
->verinfo
.verdef
== NULL
)
4153 /* See if we already know about this version. */
4154 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
4156 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
4159 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4160 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
4166 /* This is a new version. Add it to tree we are building. */
4171 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4174 rinfo
->failed
= true;
4178 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
4179 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
4180 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
4184 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, amt
);
4186 /* Note that we are copying a string pointer here, and testing it
4187 above. If bfd_elf_string_from_elf_section is ever changed to
4188 discard the string data when low in memory, this will have to be
4190 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
4192 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
4193 a
->vna_nextptr
= t
->vn_auxptr
;
4195 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
4198 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4205 /* Figure out appropriate versions for all the symbols. We may not
4206 have the version number script until we have read all of the input
4207 files, so until that point we don't know which symbols should be
4208 local. This function is called via elf_link_hash_traverse. */
4211 elf_link_assign_sym_version (h
, data
)
4212 struct elf_link_hash_entry
*h
;
4215 struct elf_assign_sym_version_info
*sinfo
;
4216 struct bfd_link_info
*info
;
4217 struct elf_backend_data
*bed
;
4218 struct elf_info_failed eif
;
4222 sinfo
= (struct elf_assign_sym_version_info
*) data
;
4225 /* Fix the symbol flags. */
4228 if (! elf_fix_symbol_flags (h
, &eif
))
4231 sinfo
->failed
= true;
4235 /* We only need version numbers for symbols defined in regular
4237 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4240 bed
= get_elf_backend_data (sinfo
->output_bfd
);
4241 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4242 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4244 struct bfd_elf_version_tree
*t
;
4249 /* There are two consecutive ELF_VER_CHR characters if this is
4250 not a hidden symbol. */
4252 if (*p
== ELF_VER_CHR
)
4258 /* If there is no version string, we can just return out. */
4262 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4266 /* Look for the version. If we find it, it is no longer weak. */
4267 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4269 if (strcmp (t
->name
, p
) == 0)
4273 struct bfd_elf_version_expr
*d
;
4275 len
= p
- h
->root
.root
.string
;
4276 alc
= bfd_malloc ((bfd_size_type
) len
);
4279 strncpy (alc
, h
->root
.root
.string
, len
- 1);
4280 alc
[len
- 1] = '\0';
4281 if (alc
[len
- 2] == ELF_VER_CHR
)
4282 alc
[len
- 2] = '\0';
4284 h
->verinfo
.vertree
= t
;
4288 if (t
->globals
!= NULL
)
4290 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4291 if ((*d
->match
) (d
, alc
))
4295 /* See if there is anything to force this symbol to
4297 if (d
== NULL
&& t
->locals
!= NULL
)
4299 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4301 if ((*d
->match
) (d
, alc
))
4303 if (h
->dynindx
!= -1
4305 && ! info
->export_dynamic
)
4307 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4320 /* If we are building an application, we need to create a
4321 version node for this version. */
4322 if (t
== NULL
&& ! info
->shared
)
4324 struct bfd_elf_version_tree
**pp
;
4327 /* If we aren't going to export this symbol, we don't need
4328 to worry about it. */
4329 if (h
->dynindx
== -1)
4333 t
= ((struct bfd_elf_version_tree
*)
4334 bfd_alloc (sinfo
->output_bfd
, amt
));
4337 sinfo
->failed
= true;
4346 t
->name_indx
= (unsigned int) -1;
4350 /* Don't count anonymous version tag. */
4351 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
4353 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
4355 t
->vernum
= version_index
;
4359 h
->verinfo
.vertree
= t
;
4363 /* We could not find the version for a symbol when
4364 generating a shared archive. Return an error. */
4365 (*_bfd_error_handler
)
4366 (_("%s: undefined versioned symbol name %s"),
4367 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
4368 bfd_set_error (bfd_error_bad_value
);
4369 sinfo
->failed
= true;
4374 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
4377 /* If we don't have a version for this symbol, see if we can find
4379 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
4381 struct bfd_elf_version_tree
*t
;
4382 struct bfd_elf_version_tree
*deflt
;
4383 struct bfd_elf_version_expr
*d
;
4385 /* See if can find what version this symbol is in. If the
4386 symbol is supposed to be local, then don't actually register
4389 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
4391 if (t
->globals
!= NULL
)
4393 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
4395 if ((*d
->match
) (d
, h
->root
.root
.string
))
4397 h
->verinfo
.vertree
= t
;
4406 if (t
->locals
!= NULL
)
4408 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
4410 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
4412 else if ((*d
->match
) (d
, h
->root
.root
.string
))
4414 h
->verinfo
.vertree
= t
;
4415 if (h
->dynindx
!= -1
4417 && ! info
->export_dynamic
)
4419 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4430 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
4432 h
->verinfo
.vertree
= deflt
;
4433 if (h
->dynindx
!= -1
4435 && ! info
->export_dynamic
)
4437 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
4445 /* Final phase of ELF linker. */
4447 /* A structure we use to avoid passing large numbers of arguments. */
4449 struct elf_final_link_info
4451 /* General link information. */
4452 struct bfd_link_info
*info
;
4455 /* Symbol string table. */
4456 struct bfd_strtab_hash
*symstrtab
;
4457 /* .dynsym section. */
4458 asection
*dynsym_sec
;
4459 /* .hash section. */
4461 /* symbol version section (.gnu.version). */
4462 asection
*symver_sec
;
4463 /* Buffer large enough to hold contents of any section. */
4465 /* Buffer large enough to hold external relocs of any section. */
4466 PTR external_relocs
;
4467 /* Buffer large enough to hold internal relocs of any section. */
4468 Elf_Internal_Rela
*internal_relocs
;
4469 /* Buffer large enough to hold external local symbols of any input
4471 Elf_External_Sym
*external_syms
;
4472 /* And a buffer for symbol section indices. */
4473 Elf_External_Sym_Shndx
*locsym_shndx
;
4474 /* Buffer large enough to hold internal local symbols of any input
4476 Elf_Internal_Sym
*internal_syms
;
4477 /* Array large enough to hold a symbol index for each local symbol
4478 of any input BFD. */
4480 /* Array large enough to hold a section pointer for each local
4481 symbol of any input BFD. */
4482 asection
**sections
;
4483 /* Buffer to hold swapped out symbols. */
4484 Elf_External_Sym
*symbuf
;
4485 /* And one for symbol section indices. */
4486 Elf_External_Sym_Shndx
*symshndxbuf
;
4487 /* Number of swapped out symbols in buffer. */
4488 size_t symbuf_count
;
4489 /* Number of symbols which fit in symbuf. */
4493 static boolean elf_link_output_sym
4494 PARAMS ((struct elf_final_link_info
*, const char *,
4495 Elf_Internal_Sym
*, asection
*));
4496 static boolean elf_link_flush_output_syms
4497 PARAMS ((struct elf_final_link_info
*));
4498 static boolean elf_link_output_extsym
4499 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4500 static boolean elf_link_sec_merge_syms
4501 PARAMS ((struct elf_link_hash_entry
*, PTR
));
4502 static boolean elf_link_input_bfd
4503 PARAMS ((struct elf_final_link_info
*, bfd
*));
4504 static boolean elf_reloc_link_order
4505 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
4506 struct bfd_link_order
*));
4508 /* This struct is used to pass information to elf_link_output_extsym. */
4510 struct elf_outext_info
4514 struct elf_final_link_info
*finfo
;
4517 /* Compute the size of, and allocate space for, REL_HDR which is the
4518 section header for a section containing relocations for O. */
4521 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
4523 Elf_Internal_Shdr
*rel_hdr
;
4526 bfd_size_type reloc_count
;
4527 bfd_size_type num_rel_hashes
;
4529 /* Figure out how many relocations there will be. */
4530 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
4531 reloc_count
= elf_section_data (o
)->rel_count
;
4533 reloc_count
= elf_section_data (o
)->rel_count2
;
4535 num_rel_hashes
= o
->reloc_count
;
4536 if (num_rel_hashes
< reloc_count
)
4537 num_rel_hashes
= reloc_count
;
4539 /* That allows us to calculate the size of the section. */
4540 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
4542 /* The contents field must last into write_object_contents, so we
4543 allocate it with bfd_alloc rather than malloc. Also since we
4544 cannot be sure that the contents will actually be filled in,
4545 we zero the allocated space. */
4546 rel_hdr
->contents
= (PTR
) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
4547 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
4550 /* We only allocate one set of hash entries, so we only do it the
4551 first time we are called. */
4552 if (elf_section_data (o
)->rel_hashes
== NULL
4555 struct elf_link_hash_entry
**p
;
4557 p
= ((struct elf_link_hash_entry
**)
4558 bfd_zmalloc (num_rel_hashes
4559 * sizeof (struct elf_link_hash_entry
*)));
4563 elf_section_data (o
)->rel_hashes
= p
;
4569 /* When performing a relocateable link, the input relocations are
4570 preserved. But, if they reference global symbols, the indices
4571 referenced must be updated. Update all the relocations in
4572 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4575 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
4577 Elf_Internal_Shdr
*rel_hdr
;
4579 struct elf_link_hash_entry
**rel_hash
;
4582 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4583 Elf_Internal_Rel
*irel
;
4584 Elf_Internal_Rela
*irela
;
4585 bfd_size_type amt
= sizeof (Elf_Internal_Rel
) * bed
->s
->int_rels_per_ext_rel
;
4587 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (amt
);
4590 (*_bfd_error_handler
) (_("Error: out of memory"));
4594 amt
= sizeof (Elf_Internal_Rela
) * bed
->s
->int_rels_per_ext_rel
;
4595 irela
= (Elf_Internal_Rela
*) bfd_zmalloc (amt
);
4598 (*_bfd_error_handler
) (_("Error: out of memory"));
4602 for (i
= 0; i
< count
; i
++, rel_hash
++)
4604 if (*rel_hash
== NULL
)
4607 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
4609 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4611 Elf_External_Rel
*erel
;
4614 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
4615 if (bed
->s
->swap_reloc_in
)
4616 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
4618 elf_swap_reloc_in (abfd
, erel
, irel
);
4620 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
4621 irel
[j
].r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4622 ELF_R_TYPE (irel
[j
].r_info
));
4624 if (bed
->s
->swap_reloc_out
)
4625 (*bed
->s
->swap_reloc_out
) (abfd
, irel
, (bfd_byte
*) erel
);
4627 elf_swap_reloc_out (abfd
, irel
, erel
);
4631 Elf_External_Rela
*erela
;
4634 BFD_ASSERT (rel_hdr
->sh_entsize
4635 == sizeof (Elf_External_Rela
));
4637 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
4638 if (bed
->s
->swap_reloca_in
)
4639 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
4641 elf_swap_reloca_in (abfd
, erela
, irela
);
4643 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
4644 irela
[j
].r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
4645 ELF_R_TYPE (irela
[j
].r_info
));
4647 if (bed
->s
->swap_reloca_out
)
4648 (*bed
->s
->swap_reloca_out
) (abfd
, irela
, (bfd_byte
*) erela
);
4650 elf_swap_reloca_out (abfd
, irela
, erela
);
4658 struct elf_link_sort_rela
{
4660 enum elf_reloc_type_class type
;
4662 Elf_Internal_Rel rel
;
4663 Elf_Internal_Rela rela
;
4668 elf_link_sort_cmp1 (A
, B
)
4672 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4673 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4674 int relativea
, relativeb
;
4676 relativea
= a
->type
== reloc_class_relative
;
4677 relativeb
= b
->type
== reloc_class_relative
;
4679 if (relativea
< relativeb
)
4681 if (relativea
> relativeb
)
4683 if (ELF_R_SYM (a
->u
.rel
.r_info
) < ELF_R_SYM (b
->u
.rel
.r_info
))
4685 if (ELF_R_SYM (a
->u
.rel
.r_info
) > ELF_R_SYM (b
->u
.rel
.r_info
))
4687 if (a
->u
.rel
.r_offset
< b
->u
.rel
.r_offset
)
4689 if (a
->u
.rel
.r_offset
> b
->u
.rel
.r_offset
)
4695 elf_link_sort_cmp2 (A
, B
)
4699 struct elf_link_sort_rela
*a
= (struct elf_link_sort_rela
*) A
;
4700 struct elf_link_sort_rela
*b
= (struct elf_link_sort_rela
*) B
;
4703 if (a
->offset
< b
->offset
)
4705 if (a
->offset
> b
->offset
)
4707 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
4708 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
4713 if (a
->u
.rel
.r_offset
< b
->u
.rel
.r_offset
)
4715 if (a
->u
.rel
.r_offset
> b
->u
.rel
.r_offset
)
4721 elf_link_sort_relocs (abfd
, info
, psec
)
4723 struct bfd_link_info
*info
;
4726 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
4727 asection
*reldyn
, *o
;
4728 boolean rel
= false;
4729 bfd_size_type count
, size
;
4731 struct elf_link_sort_rela
*rela
;
4732 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4734 reldyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
4735 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4737 reldyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
4738 if (reldyn
== NULL
|| reldyn
->_raw_size
== 0)
4741 count
= reldyn
->_raw_size
/ sizeof (Elf_External_Rel
);
4744 count
= reldyn
->_raw_size
/ sizeof (Elf_External_Rela
);
4747 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4748 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4749 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4750 && o
->output_section
== reldyn
)
4751 size
+= o
->_raw_size
;
4753 if (size
!= reldyn
->_raw_size
)
4756 rela
= (struct elf_link_sort_rela
*) bfd_zmalloc (sizeof (*rela
) * count
);
4759 (*info
->callbacks
->warning
)
4760 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0,
4765 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4766 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4767 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4768 && o
->output_section
== reldyn
)
4772 Elf_External_Rel
*erel
, *erelend
;
4773 struct elf_link_sort_rela
*s
;
4775 erel
= (Elf_External_Rel
*) o
->contents
;
4776 erelend
= (Elf_External_Rel
*) (o
->contents
+ o
->_raw_size
);
4777 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rel
);
4778 for (; erel
< erelend
; erel
++, s
++)
4780 if (bed
->s
->swap_reloc_in
)
4781 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, &s
->u
.rel
);
4783 elf_swap_reloc_in (abfd
, erel
, &s
->u
.rel
);
4785 s
->type
= (*bed
->elf_backend_reloc_type_class
) (&s
->u
.rela
);
4790 Elf_External_Rela
*erela
, *erelaend
;
4791 struct elf_link_sort_rela
*s
;
4793 erela
= (Elf_External_Rela
*) o
->contents
;
4794 erelaend
= (Elf_External_Rela
*) (o
->contents
+ o
->_raw_size
);
4795 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rela
);
4796 for (; erela
< erelaend
; erela
++, s
++)
4798 if (bed
->s
->swap_reloca_in
)
4799 (*bed
->s
->swap_reloca_in
) (dynobj
, (bfd_byte
*) erela
,
4802 elf_swap_reloca_in (dynobj
, erela
, &s
->u
.rela
);
4804 s
->type
= (*bed
->elf_backend_reloc_type_class
) (&s
->u
.rela
);
4809 qsort (rela
, (size_t) count
, sizeof (*rela
), elf_link_sort_cmp1
);
4810 for (ret
= 0; ret
< count
&& rela
[ret
].type
== reloc_class_relative
; ret
++)
4812 for (i
= ret
, j
= ret
; i
< count
; i
++)
4814 if (ELF_R_SYM (rela
[i
].u
.rel
.r_info
) != ELF_R_SYM (rela
[j
].u
.rel
.r_info
))
4816 rela
[i
].offset
= rela
[j
].u
.rel
.r_offset
;
4818 qsort (rela
+ ret
, (size_t) count
- ret
, sizeof (*rela
), elf_link_sort_cmp2
);
4820 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4821 if ((o
->flags
& (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
))
4822 == (SEC_HAS_CONTENTS
|SEC_LINKER_CREATED
)
4823 && o
->output_section
== reldyn
)
4827 Elf_External_Rel
*erel
, *erelend
;
4828 struct elf_link_sort_rela
*s
;
4830 erel
= (Elf_External_Rel
*) o
->contents
;
4831 erelend
= (Elf_External_Rel
*) (o
->contents
+ o
->_raw_size
);
4832 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rel
);
4833 for (; erel
< erelend
; erel
++, s
++)
4835 if (bed
->s
->swap_reloc_out
)
4836 (*bed
->s
->swap_reloc_out
) (abfd
, &s
->u
.rel
,
4839 elf_swap_reloc_out (abfd
, &s
->u
.rel
, erel
);
4844 Elf_External_Rela
*erela
, *erelaend
;
4845 struct elf_link_sort_rela
*s
;
4847 erela
= (Elf_External_Rela
*) o
->contents
;
4848 erelaend
= (Elf_External_Rela
*) (o
->contents
+ o
->_raw_size
);
4849 s
= rela
+ o
->output_offset
/ sizeof (Elf_External_Rela
);
4850 for (; erela
< erelaend
; erela
++, s
++)
4852 if (bed
->s
->swap_reloca_out
)
4853 (*bed
->s
->swap_reloca_out
) (dynobj
, &s
->u
.rela
,
4854 (bfd_byte
*) erela
);
4856 elf_swap_reloca_out (dynobj
, &s
->u
.rela
, erela
);
4866 /* Do the final step of an ELF link. */
4869 elf_bfd_final_link (abfd
, info
)
4871 struct bfd_link_info
*info
;
4874 boolean emit_relocs
;
4876 struct elf_final_link_info finfo
;
4877 register asection
*o
;
4878 register struct bfd_link_order
*p
;
4880 bfd_size_type max_contents_size
;
4881 bfd_size_type max_external_reloc_size
;
4882 bfd_size_type max_internal_reloc_count
;
4883 bfd_size_type max_sym_count
;
4884 bfd_size_type max_sym_shndx_count
;
4886 Elf_Internal_Sym elfsym
;
4888 Elf_Internal_Shdr
*symtab_hdr
;
4889 Elf_Internal_Shdr
*symstrtab_hdr
;
4890 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4891 struct elf_outext_info eoinfo
;
4893 size_t relativecount
= 0;
4894 asection
*reldyn
= 0;
4897 if (! is_elf_hash_table (info
))
4901 abfd
->flags
|= DYNAMIC
;
4903 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4904 dynobj
= elf_hash_table (info
)->dynobj
;
4906 emit_relocs
= (info
->relocateable
4907 || info
->emitrelocations
4908 || bed
->elf_backend_emit_relocs
);
4911 finfo
.output_bfd
= abfd
;
4912 finfo
.symstrtab
= elf_stringtab_init ();
4913 if (finfo
.symstrtab
== NULL
)
4918 finfo
.dynsym_sec
= NULL
;
4919 finfo
.hash_sec
= NULL
;
4920 finfo
.symver_sec
= NULL
;
4924 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4925 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4926 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4927 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4928 /* Note that it is OK if symver_sec is NULL. */
4931 finfo
.contents
= NULL
;
4932 finfo
.external_relocs
= NULL
;
4933 finfo
.internal_relocs
= NULL
;
4934 finfo
.external_syms
= NULL
;
4935 finfo
.locsym_shndx
= NULL
;
4936 finfo
.internal_syms
= NULL
;
4937 finfo
.indices
= NULL
;
4938 finfo
.sections
= NULL
;
4939 finfo
.symbuf
= NULL
;
4940 finfo
.symshndxbuf
= NULL
;
4941 finfo
.symbuf_count
= 0;
4943 /* Count up the number of relocations we will output for each output
4944 section, so that we know the sizes of the reloc sections. We
4945 also figure out some maximum sizes. */
4946 max_contents_size
= 0;
4947 max_external_reloc_size
= 0;
4948 max_internal_reloc_count
= 0;
4950 max_sym_shndx_count
= 0;
4952 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4956 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4958 if (p
->type
== bfd_section_reloc_link_order
4959 || p
->type
== bfd_symbol_reloc_link_order
)
4961 else if (p
->type
== bfd_indirect_link_order
)
4965 sec
= p
->u
.indirect
.section
;
4967 /* Mark all sections which are to be included in the
4968 link. This will normally be every section. We need
4969 to do this so that we can identify any sections which
4970 the linker has decided to not include. */
4971 sec
->linker_mark
= true;
4973 if (sec
->flags
& SEC_MERGE
)
4976 if (info
->relocateable
|| info
->emitrelocations
)
4977 o
->reloc_count
+= sec
->reloc_count
;
4978 else if (bed
->elf_backend_count_relocs
)
4980 Elf_Internal_Rela
* relocs
;
4982 relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4983 (abfd
, sec
, (PTR
) NULL
,
4984 (Elf_Internal_Rela
*) NULL
, info
->keep_memory
));
4987 += (*bed
->elf_backend_count_relocs
) (sec
, relocs
);
4989 if (!info
->keep_memory
)
4993 if (sec
->_raw_size
> max_contents_size
)
4994 max_contents_size
= sec
->_raw_size
;
4995 if (sec
->_cooked_size
> max_contents_size
)
4996 max_contents_size
= sec
->_cooked_size
;
4998 /* We are interested in just local symbols, not all
5000 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
5001 && (sec
->owner
->flags
& DYNAMIC
) == 0)
5005 if (elf_bad_symtab (sec
->owner
))
5006 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
5007 / sizeof (Elf_External_Sym
));
5009 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
5011 if (sym_count
> max_sym_count
)
5012 max_sym_count
= sym_count
;
5014 if (sym_count
> max_sym_shndx_count
5015 && elf_symtab_shndx (sec
->owner
) != 0)
5016 max_sym_shndx_count
= sym_count
;
5018 if ((sec
->flags
& SEC_RELOC
) != 0)
5022 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
5023 if (ext_size
> max_external_reloc_size
)
5024 max_external_reloc_size
= ext_size
;
5025 if (sec
->reloc_count
> max_internal_reloc_count
)
5026 max_internal_reloc_count
= sec
->reloc_count
;
5032 if (o
->reloc_count
> 0)
5033 o
->flags
|= SEC_RELOC
;
5036 /* Explicitly clear the SEC_RELOC flag. The linker tends to
5037 set it (this is probably a bug) and if it is set
5038 assign_section_numbers will create a reloc section. */
5039 o
->flags
&=~ SEC_RELOC
;
5042 /* If the SEC_ALLOC flag is not set, force the section VMA to
5043 zero. This is done in elf_fake_sections as well, but forcing
5044 the VMA to 0 here will ensure that relocs against these
5045 sections are handled correctly. */
5046 if ((o
->flags
& SEC_ALLOC
) == 0
5047 && ! o
->user_set_vma
)
5051 if (! info
->relocateable
&& merged
)
5052 elf_link_hash_traverse (elf_hash_table (info
),
5053 elf_link_sec_merge_syms
, (PTR
) abfd
);
5055 /* Figure out the file positions for everything but the symbol table
5056 and the relocs. We set symcount to force assign_section_numbers
5057 to create a symbol table. */
5058 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
5059 BFD_ASSERT (! abfd
->output_has_begun
);
5060 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
5063 /* Figure out how many relocations we will have in each section.
5064 Just using RELOC_COUNT isn't good enough since that doesn't
5065 maintain a separate value for REL vs. RELA relocations. */
5067 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5068 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5070 asection
*output_section
;
5072 if (! o
->linker_mark
)
5074 /* This section was omitted from the link. */
5078 output_section
= o
->output_section
;
5080 if (output_section
!= NULL
5081 && (o
->flags
& SEC_RELOC
) != 0)
5083 struct bfd_elf_section_data
*esdi
5084 = elf_section_data (o
);
5085 struct bfd_elf_section_data
*esdo
5086 = elf_section_data (output_section
);
5087 unsigned int *rel_count
;
5088 unsigned int *rel_count2
;
5090 /* We must be careful to add the relocation froms the
5091 input section to the right output count. */
5092 if (esdi
->rel_hdr
.sh_entsize
== esdo
->rel_hdr
.sh_entsize
)
5094 rel_count
= &esdo
->rel_count
;
5095 rel_count2
= &esdo
->rel_count2
;
5099 rel_count
= &esdo
->rel_count2
;
5100 rel_count2
= &esdo
->rel_count
;
5103 *rel_count
+= NUM_SHDR_ENTRIES (& esdi
->rel_hdr
);
5105 *rel_count2
+= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
5106 output_section
->flags
|= SEC_RELOC
;
5110 /* That created the reloc sections. Set their sizes, and assign
5111 them file positions, and allocate some buffers. */
5112 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5114 if ((o
->flags
& SEC_RELOC
) != 0)
5116 if (!elf_link_size_reloc_section (abfd
,
5117 &elf_section_data (o
)->rel_hdr
,
5121 if (elf_section_data (o
)->rel_hdr2
5122 && !elf_link_size_reloc_section (abfd
,
5123 elf_section_data (o
)->rel_hdr2
,
5128 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
5129 to count upwards while actually outputting the relocations. */
5130 elf_section_data (o
)->rel_count
= 0;
5131 elf_section_data (o
)->rel_count2
= 0;
5134 _bfd_elf_assign_file_positions_for_relocs (abfd
);
5136 /* We have now assigned file positions for all the sections except
5137 .symtab and .strtab. We start the .symtab section at the current
5138 file position, and write directly to it. We build the .strtab
5139 section in memory. */
5140 bfd_get_symcount (abfd
) = 0;
5141 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
5142 /* sh_name is set in prep_headers. */
5143 symtab_hdr
->sh_type
= SHT_SYMTAB
;
5144 symtab_hdr
->sh_flags
= 0;
5145 symtab_hdr
->sh_addr
= 0;
5146 symtab_hdr
->sh_size
= 0;
5147 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
5148 /* sh_link is set in assign_section_numbers. */
5149 /* sh_info is set below. */
5150 /* sh_offset is set just below. */
5151 symtab_hdr
->sh_addralign
= bed
->s
->file_align
;
5153 off
= elf_tdata (abfd
)->next_file_pos
;
5154 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
5156 /* Note that at this point elf_tdata (abfd)->next_file_pos is
5157 incorrect. We do not yet know the size of the .symtab section.
5158 We correct next_file_pos below, after we do know the size. */
5160 /* Allocate a buffer to hold swapped out symbols. This is to avoid
5161 continuously seeking to the right position in the file. */
5162 if (! info
->keep_memory
|| max_sym_count
< 20)
5163 finfo
.symbuf_size
= 20;
5165 finfo
.symbuf_size
= max_sym_count
;
5166 amt
= finfo
.symbuf_size
;
5167 amt
*= sizeof (Elf_External_Sym
);
5168 finfo
.symbuf
= (Elf_External_Sym
*) bfd_malloc (amt
);
5169 if (finfo
.symbuf
== NULL
)
5171 if (elf_numsections (abfd
) > SHN_LORESERVE
)
5173 amt
= finfo
.symbuf_size
;
5174 amt
*= sizeof (Elf_External_Sym_Shndx
);
5175 finfo
.symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
5176 if (finfo
.symshndxbuf
== NULL
)
5180 /* Start writing out the symbol table. The first symbol is always a
5182 if (info
->strip
!= strip_all
5185 elfsym
.st_value
= 0;
5188 elfsym
.st_other
= 0;
5189 elfsym
.st_shndx
= SHN_UNDEF
;
5190 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5191 &elfsym
, bfd_und_section_ptr
))
5196 /* Some standard ELF linkers do this, but we don't because it causes
5197 bootstrap comparison failures. */
5198 /* Output a file symbol for the output file as the second symbol.
5199 We output this even if we are discarding local symbols, although
5200 I'm not sure if this is correct. */
5201 elfsym
.st_value
= 0;
5203 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
5204 elfsym
.st_other
= 0;
5205 elfsym
.st_shndx
= SHN_ABS
;
5206 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
5207 &elfsym
, bfd_abs_section_ptr
))
5211 /* Output a symbol for each section. We output these even if we are
5212 discarding local symbols, since they are used for relocs. These
5213 symbols have no names. We store the index of each one in the
5214 index field of the section, so that we can find it again when
5215 outputting relocs. */
5216 if (info
->strip
!= strip_all
5220 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5221 elfsym
.st_other
= 0;
5222 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5224 o
= section_from_elf_index (abfd
, i
);
5226 o
->target_index
= bfd_get_symcount (abfd
);
5227 elfsym
.st_shndx
= i
;
5228 if (info
->relocateable
|| o
== NULL
)
5229 elfsym
.st_value
= 0;
5231 elfsym
.st_value
= o
->vma
;
5232 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
5235 if (i
== SHN_LORESERVE
)
5236 i
+= SHN_HIRESERVE
+ 1 - SHN_LORESERVE
;
5240 /* Allocate some memory to hold information read in from the input
5242 if (max_contents_size
!= 0)
5244 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
5245 if (finfo
.contents
== NULL
)
5249 if (max_external_reloc_size
!= 0)
5251 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
5252 if (finfo
.external_relocs
== NULL
)
5256 if (max_internal_reloc_count
!= 0)
5258 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5259 amt
*= sizeof (Elf_Internal_Rela
);
5260 finfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
5261 if (finfo
.internal_relocs
== NULL
)
5265 if (max_sym_count
!= 0)
5267 amt
= max_sym_count
* sizeof (Elf_External_Sym
);
5268 finfo
.external_syms
= (Elf_External_Sym
*) bfd_malloc (amt
);
5269 if (finfo
.external_syms
== NULL
)
5272 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
5273 finfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
5274 if (finfo
.internal_syms
== NULL
)
5277 amt
= max_sym_count
* sizeof (long);
5278 finfo
.indices
= (long *) bfd_malloc (amt
);
5279 if (finfo
.indices
== NULL
)
5282 amt
= max_sym_count
* sizeof (asection
*);
5283 finfo
.sections
= (asection
**) bfd_malloc (amt
);
5284 if (finfo
.sections
== NULL
)
5288 if (max_sym_shndx_count
!= 0)
5290 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
5291 finfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
5292 if (finfo
.locsym_shndx
== NULL
)
5296 /* Since ELF permits relocations to be against local symbols, we
5297 must have the local symbols available when we do the relocations.
5298 Since we would rather only read the local symbols once, and we
5299 would rather not keep them in memory, we handle all the
5300 relocations for a single input file at the same time.
5302 Unfortunately, there is no way to know the total number of local
5303 symbols until we have seen all of them, and the local symbol
5304 indices precede the global symbol indices. This means that when
5305 we are generating relocateable output, and we see a reloc against
5306 a global symbol, we can not know the symbol index until we have
5307 finished examining all the local symbols to see which ones we are
5308 going to output. To deal with this, we keep the relocations in
5309 memory, and don't output them until the end of the link. This is
5310 an unfortunate waste of memory, but I don't see a good way around
5311 it. Fortunately, it only happens when performing a relocateable
5312 link, which is not the common case. FIXME: If keep_memory is set
5313 we could write the relocs out and then read them again; I don't
5314 know how bad the memory loss will be. */
5316 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
5317 sub
->output_has_begun
= false;
5318 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5320 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
5322 if (p
->type
== bfd_indirect_link_order
5323 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
5324 == bfd_target_elf_flavour
))
5326 sub
= p
->u
.indirect
.section
->owner
;
5327 if (! sub
->output_has_begun
)
5329 if (! elf_link_input_bfd (&finfo
, sub
))
5331 sub
->output_has_begun
= true;
5334 else if (p
->type
== bfd_section_reloc_link_order
5335 || p
->type
== bfd_symbol_reloc_link_order
)
5337 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
5342 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
5348 /* Output any global symbols that got converted to local in a
5349 version script or due to symbol visibility. We do this in a
5350 separate step since ELF requires all local symbols to appear
5351 prior to any global symbols. FIXME: We should only do this if
5352 some global symbols were, in fact, converted to become local.
5353 FIXME: Will this work correctly with the Irix 5 linker? */
5354 eoinfo
.failed
= false;
5355 eoinfo
.finfo
= &finfo
;
5356 eoinfo
.localsyms
= true;
5357 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5362 /* That wrote out all the local symbols. Finish up the symbol table
5363 with the global symbols. Even if we want to strip everything we
5364 can, we still need to deal with those global symbols that got
5365 converted to local in a version script. */
5367 /* The sh_info field records the index of the first non local symbol. */
5368 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
5371 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
5373 Elf_Internal_Sym sym
;
5374 Elf_External_Sym
*dynsym
=
5375 (Elf_External_Sym
*) finfo
.dynsym_sec
->contents
;
5376 long last_local
= 0;
5378 /* Write out the section symbols for the output sections. */
5385 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
5388 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5391 Elf_External_Sym
*dest
;
5393 indx
= elf_section_data (s
)->this_idx
;
5394 BFD_ASSERT (indx
> 0);
5395 sym
.st_shndx
= indx
;
5396 sym
.st_value
= s
->vma
;
5397 dest
= dynsym
+ elf_section_data (s
)->dynindx
;
5398 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5401 last_local
= bfd_count_sections (abfd
);
5404 /* Write out the local dynsyms. */
5405 if (elf_hash_table (info
)->dynlocal
)
5407 struct elf_link_local_dynamic_entry
*e
;
5408 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
5411 Elf_External_Sym
*dest
;
5413 sym
.st_size
= e
->isym
.st_size
;
5414 sym
.st_other
= e
->isym
.st_other
;
5416 /* Copy the internal symbol as is.
5417 Note that we saved a word of storage and overwrote
5418 the original st_name with the dynstr_index. */
5421 if (e
->isym
.st_shndx
!= SHN_UNDEF
5422 && (e
->isym
.st_shndx
< SHN_LORESERVE
5423 || e
->isym
.st_shndx
> SHN_HIRESERVE
))
5425 s
= bfd_section_from_elf_index (e
->input_bfd
,
5429 elf_section_data (s
->output_section
)->this_idx
;
5430 sym
.st_value
= (s
->output_section
->vma
5432 + e
->isym
.st_value
);
5435 if (last_local
< e
->dynindx
)
5436 last_local
= e
->dynindx
;
5438 dest
= dynsym
+ e
->dynindx
;
5439 elf_swap_symbol_out (abfd
, &sym
, (PTR
) dest
, (PTR
) 0);
5443 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
5447 /* We get the global symbols from the hash table. */
5448 eoinfo
.failed
= false;
5449 eoinfo
.localsyms
= false;
5450 eoinfo
.finfo
= &finfo
;
5451 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
5456 /* If backend needs to output some symbols not present in the hash
5457 table, do it now. */
5458 if (bed
->elf_backend_output_arch_syms
)
5460 typedef boolean (*out_sym_func
) PARAMS ((PTR
, const char *,
5464 if (! ((*bed
->elf_backend_output_arch_syms
)
5465 (abfd
, info
, (PTR
) &finfo
, (out_sym_func
) elf_link_output_sym
)))
5469 /* Flush all symbols to the file. */
5470 if (! elf_link_flush_output_syms (&finfo
))
5473 /* Now we know the size of the symtab section. */
5474 off
+= symtab_hdr
->sh_size
;
5476 /* Finish up and write out the symbol string table (.strtab)
5478 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
5479 /* sh_name was set in prep_headers. */
5480 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
5481 symstrtab_hdr
->sh_flags
= 0;
5482 symstrtab_hdr
->sh_addr
= 0;
5483 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
5484 symstrtab_hdr
->sh_entsize
= 0;
5485 symstrtab_hdr
->sh_link
= 0;
5486 symstrtab_hdr
->sh_info
= 0;
5487 /* sh_offset is set just below. */
5488 symstrtab_hdr
->sh_addralign
= 1;
5490 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
5491 elf_tdata (abfd
)->next_file_pos
= off
;
5493 if (bfd_get_symcount (abfd
) > 0)
5495 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
5496 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
5500 /* Adjust the relocs to have the correct symbol indices. */
5501 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5503 if ((o
->flags
& SEC_RELOC
) == 0)
5506 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
5507 elf_section_data (o
)->rel_count
,
5508 elf_section_data (o
)->rel_hashes
);
5509 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
5510 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
5511 elf_section_data (o
)->rel_count2
,
5512 (elf_section_data (o
)->rel_hashes
5513 + elf_section_data (o
)->rel_count
));
5515 /* Set the reloc_count field to 0 to prevent write_relocs from
5516 trying to swap the relocs out itself. */
5520 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
5521 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
5523 /* If we are linking against a dynamic object, or generating a
5524 shared library, finish up the dynamic linking information. */
5527 Elf_External_Dyn
*dyncon
, *dynconend
;
5529 /* Fix up .dynamic entries. */
5530 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
5531 BFD_ASSERT (o
!= NULL
);
5533 dyncon
= (Elf_External_Dyn
*) o
->contents
;
5534 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
5535 for (; dyncon
< dynconend
; dyncon
++)
5537 Elf_Internal_Dyn dyn
;
5541 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
5548 if (relativecount
> 0 && dyncon
+ 1 < dynconend
)
5550 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
5552 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
5553 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
5556 if (dyn
.d_tag
!= DT_NULL
)
5558 dyn
.d_un
.d_val
= relativecount
;
5559 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5565 name
= info
->init_function
;
5568 name
= info
->fini_function
;
5571 struct elf_link_hash_entry
*h
;
5573 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
5574 false, false, true);
5576 && (h
->root
.type
== bfd_link_hash_defined
5577 || h
->root
.type
== bfd_link_hash_defweak
))
5579 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
5580 o
= h
->root
.u
.def
.section
;
5581 if (o
->output_section
!= NULL
)
5582 dyn
.d_un
.d_val
+= (o
->output_section
->vma
5583 + o
->output_offset
);
5586 /* The symbol is imported from another shared
5587 library and does not apply to this one. */
5591 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5596 case DT_PREINIT_ARRAYSZ
:
5597 name
= ".preinit_array";
5599 case DT_INIT_ARRAYSZ
:
5600 name
= ".init_array";
5602 case DT_FINI_ARRAYSZ
:
5603 name
= ".fini_array";
5605 o
= bfd_get_section_by_name (abfd
, name
);
5606 BFD_ASSERT (o
!= NULL
);
5607 if (o
->_raw_size
== 0)
5608 (*_bfd_error_handler
)
5609 (_("warning: %s section has zero size"), name
);
5610 dyn
.d_un
.d_val
= o
->_raw_size
;
5611 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5614 case DT_PREINIT_ARRAY
:
5615 name
= ".preinit_array";
5618 name
= ".init_array";
5621 name
= ".fini_array";
5634 name
= ".gnu.version_d";
5637 name
= ".gnu.version_r";
5640 name
= ".gnu.version";
5642 o
= bfd_get_section_by_name (abfd
, name
);
5643 BFD_ASSERT (o
!= NULL
);
5644 dyn
.d_un
.d_ptr
= o
->vma
;
5645 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5652 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
5657 for (i
= 1; i
< elf_numsections (abfd
); i
++)
5659 Elf_Internal_Shdr
*hdr
;
5661 hdr
= elf_elfsections (abfd
)[i
];
5662 if (hdr
->sh_type
== type
5663 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
5665 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
5666 dyn
.d_un
.d_val
+= hdr
->sh_size
;
5669 if (dyn
.d_un
.d_val
== 0
5670 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
5671 dyn
.d_un
.d_val
= hdr
->sh_addr
;
5675 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
5681 /* If we have created any dynamic sections, then output them. */
5684 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
5687 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
5689 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5690 || o
->_raw_size
== 0
5691 || o
->output_section
== bfd_abs_section_ptr
)
5693 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
5695 /* At this point, we are only interested in sections
5696 created by elf_link_create_dynamic_sections. */
5699 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
5701 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
5703 if (! bfd_set_section_contents (abfd
, o
->output_section
,
5705 (file_ptr
) o
->output_offset
,
5711 /* The contents of the .dynstr section are actually in a
5713 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
5714 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
5715 || ! _bfd_elf_strtab_emit (abfd
,
5716 elf_hash_table (info
)->dynstr
))
5722 /* If we have optimized stabs strings, output them. */
5723 if (elf_hash_table (info
)->stab_info
!= NULL
)
5725 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
5729 if (info
->eh_frame_hdr
&& elf_hash_table (info
)->dynobj
)
5731 o
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5734 && (elf_section_data (o
)->sec_info_type
5735 == ELF_INFO_TYPE_EH_FRAME_HDR
))
5737 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, o
))
5742 if (finfo
.symstrtab
!= NULL
)
5743 _bfd_stringtab_free (finfo
.symstrtab
);
5744 if (finfo
.contents
!= NULL
)
5745 free (finfo
.contents
);
5746 if (finfo
.external_relocs
!= NULL
)
5747 free (finfo
.external_relocs
);
5748 if (finfo
.internal_relocs
!= NULL
)
5749 free (finfo
.internal_relocs
);
5750 if (finfo
.external_syms
!= NULL
)
5751 free (finfo
.external_syms
);
5752 if (finfo
.locsym_shndx
!= NULL
)
5753 free (finfo
.locsym_shndx
);
5754 if (finfo
.internal_syms
!= NULL
)
5755 free (finfo
.internal_syms
);
5756 if (finfo
.indices
!= NULL
)
5757 free (finfo
.indices
);
5758 if (finfo
.sections
!= NULL
)
5759 free (finfo
.sections
);
5760 if (finfo
.symbuf
!= NULL
)
5761 free (finfo
.symbuf
);
5762 if (finfo
.symshndxbuf
!= NULL
)
5763 free (finfo
.symbuf
);
5764 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5766 if ((o
->flags
& SEC_RELOC
) != 0
5767 && elf_section_data (o
)->rel_hashes
!= NULL
)
5768 free (elf_section_data (o
)->rel_hashes
);
5771 elf_tdata (abfd
)->linker
= true;
5776 if (finfo
.symstrtab
!= NULL
)
5777 _bfd_stringtab_free (finfo
.symstrtab
);
5778 if (finfo
.contents
!= NULL
)
5779 free (finfo
.contents
);
5780 if (finfo
.external_relocs
!= NULL
)
5781 free (finfo
.external_relocs
);
5782 if (finfo
.internal_relocs
!= NULL
)
5783 free (finfo
.internal_relocs
);
5784 if (finfo
.external_syms
!= NULL
)
5785 free (finfo
.external_syms
);
5786 if (finfo
.locsym_shndx
!= NULL
)
5787 free (finfo
.locsym_shndx
);
5788 if (finfo
.internal_syms
!= NULL
)
5789 free (finfo
.internal_syms
);
5790 if (finfo
.indices
!= NULL
)
5791 free (finfo
.indices
);
5792 if (finfo
.sections
!= NULL
)
5793 free (finfo
.sections
);
5794 if (finfo
.symbuf
!= NULL
)
5795 free (finfo
.symbuf
);
5796 if (finfo
.symshndxbuf
!= NULL
)
5797 free (finfo
.symbuf
);
5798 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
5800 if ((o
->flags
& SEC_RELOC
) != 0
5801 && elf_section_data (o
)->rel_hashes
!= NULL
)
5802 free (elf_section_data (o
)->rel_hashes
);
5808 /* Add a symbol to the output symbol table. */
5811 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
5812 struct elf_final_link_info
*finfo
;
5814 Elf_Internal_Sym
*elfsym
;
5815 asection
*input_sec
;
5817 Elf_External_Sym
*dest
;
5818 Elf_External_Sym_Shndx
*destshndx
;
5820 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
5821 struct bfd_link_info
*info
,
5826 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
5827 elf_backend_link_output_symbol_hook
;
5828 if (output_symbol_hook
!= NULL
)
5830 if (! ((*output_symbol_hook
)
5831 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
5835 if (name
== (const char *) NULL
|| *name
== '\0')
5836 elfsym
->st_name
= 0;
5837 else if (input_sec
->flags
& SEC_EXCLUDE
)
5838 elfsym
->st_name
= 0;
5841 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
5843 if (elfsym
->st_name
== (unsigned long) -1)
5847 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
5849 if (! elf_link_flush_output_syms (finfo
))
5853 dest
= finfo
->symbuf
+ finfo
->symbuf_count
;
5854 destshndx
= finfo
->symshndxbuf
;
5855 if (destshndx
!= NULL
)
5856 destshndx
+= finfo
->symbuf_count
;
5857 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
, (PTR
) dest
, (PTR
) destshndx
);
5858 ++finfo
->symbuf_count
;
5860 ++ bfd_get_symcount (finfo
->output_bfd
);
5865 /* Flush the output symbols to the file. */
5868 elf_link_flush_output_syms (finfo
)
5869 struct elf_final_link_info
*finfo
;
5871 if (finfo
->symbuf_count
> 0)
5873 Elf_Internal_Shdr
*hdr
;
5877 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
5878 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5879 amt
= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
5880 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5881 || bfd_bwrite ((PTR
) finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
5884 hdr
->sh_size
+= amt
;
5886 if (finfo
->symshndxbuf
!= NULL
)
5888 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_shndx_hdr
;
5889 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
5890 amt
= finfo
->symbuf_count
* sizeof (Elf_External_Sym_Shndx
);
5891 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
5892 || (bfd_bwrite ((PTR
) finfo
->symshndxbuf
, amt
, finfo
->output_bfd
)
5896 hdr
->sh_size
+= amt
;
5899 finfo
->symbuf_count
= 0;
5905 /* Adjust all external symbols pointing into SEC_MERGE sections
5906 to reflect the object merging within the sections. */
5909 elf_link_sec_merge_syms (h
, data
)
5910 struct elf_link_hash_entry
*h
;
5915 if ((h
->root
.type
== bfd_link_hash_defined
5916 || h
->root
.type
== bfd_link_hash_defweak
)
5917 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
5918 && elf_section_data (sec
)->sec_info_type
== ELF_INFO_TYPE_MERGE
)
5920 bfd
*output_bfd
= (bfd
*) data
;
5922 h
->root
.u
.def
.value
=
5923 _bfd_merged_section_offset (output_bfd
,
5924 &h
->root
.u
.def
.section
,
5925 elf_section_data (sec
)->sec_info
,
5926 h
->root
.u
.def
.value
, (bfd_vma
) 0);
5932 /* Add an external symbol to the symbol table. This is called from
5933 the hash table traversal routine. When generating a shared object,
5934 we go through the symbol table twice. The first time we output
5935 anything that might have been forced to local scope in a version
5936 script. The second time we output the symbols that are still
5940 elf_link_output_extsym (h
, data
)
5941 struct elf_link_hash_entry
*h
;
5944 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
5945 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
5947 Elf_Internal_Sym sym
;
5948 asection
*input_sec
;
5950 /* Decide whether to output this symbol in this pass. */
5951 if (eoinfo
->localsyms
)
5953 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
5958 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5962 /* If we are not creating a shared library, and this symbol is
5963 referenced by a shared library but is not defined anywhere, then
5964 warn that it is undefined. If we do not do this, the runtime
5965 linker will complain that the symbol is undefined when the
5966 program is run. We don't have to worry about symbols that are
5967 referenced by regular files, because we will already have issued
5968 warnings for them. */
5969 if (! finfo
->info
->relocateable
5970 && ! finfo
->info
->allow_shlib_undefined
5971 && ! finfo
->info
->shared
5972 && h
->root
.type
== bfd_link_hash_undefined
5973 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
5974 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5976 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
5977 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
5978 (asection
*) NULL
, (bfd_vma
) 0, true)))
5980 eoinfo
->failed
= true;
5985 /* We don't want to output symbols that have never been mentioned by
5986 a regular file, or that we have been told to strip. However, if
5987 h->indx is set to -2, the symbol is used by a reloc and we must
5991 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
5992 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
5993 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
5994 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
5996 else if (finfo
->info
->strip
== strip_all
5997 || (finfo
->info
->strip
== strip_some
5998 && bfd_hash_lookup (finfo
->info
->keep_hash
,
5999 h
->root
.root
.string
,
6000 false, false) == NULL
))
6005 /* If we're stripping it, and it's not a dynamic symbol, there's
6006 nothing else to do unless it is a forced local symbol. */
6009 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6013 sym
.st_size
= h
->size
;
6014 sym
.st_other
= h
->other
;
6015 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6016 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
6017 else if (h
->root
.type
== bfd_link_hash_undefweak
6018 || h
->root
.type
== bfd_link_hash_defweak
)
6019 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
6021 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
6023 switch (h
->root
.type
)
6026 case bfd_link_hash_new
:
6030 case bfd_link_hash_undefined
:
6031 input_sec
= bfd_und_section_ptr
;
6032 sym
.st_shndx
= SHN_UNDEF
;
6035 case bfd_link_hash_undefweak
:
6036 input_sec
= bfd_und_section_ptr
;
6037 sym
.st_shndx
= SHN_UNDEF
;
6040 case bfd_link_hash_defined
:
6041 case bfd_link_hash_defweak
:
6043 input_sec
= h
->root
.u
.def
.section
;
6044 if (input_sec
->output_section
!= NULL
)
6047 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
6048 input_sec
->output_section
);
6049 if (sym
.st_shndx
== SHN_BAD
)
6051 (*_bfd_error_handler
)
6052 (_("%s: could not find output section %s for input section %s"),
6053 bfd_get_filename (finfo
->output_bfd
),
6054 input_sec
->output_section
->name
,
6056 eoinfo
->failed
= true;
6060 /* ELF symbols in relocateable files are section relative,
6061 but in nonrelocateable files they are virtual
6063 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
6064 if (! finfo
->info
->relocateable
)
6065 sym
.st_value
+= input_sec
->output_section
->vma
;
6069 BFD_ASSERT (input_sec
->owner
== NULL
6070 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
6071 sym
.st_shndx
= SHN_UNDEF
;
6072 input_sec
= bfd_und_section_ptr
;
6077 case bfd_link_hash_common
:
6078 input_sec
= h
->root
.u
.c
.p
->section
;
6079 sym
.st_shndx
= SHN_COMMON
;
6080 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
6083 case bfd_link_hash_indirect
:
6084 /* These symbols are created by symbol versioning. They point
6085 to the decorated version of the name. For example, if the
6086 symbol foo@@GNU_1.2 is the default, which should be used when
6087 foo is used with no version, then we add an indirect symbol
6088 foo which points to foo@@GNU_1.2. We ignore these symbols,
6089 since the indirected symbol is already in the hash table. */
6092 case bfd_link_hash_warning
:
6093 /* We can't represent these symbols in ELF, although a warning
6094 symbol may have come from a .gnu.warning.SYMBOL section. We
6095 just put the target symbol in the hash table. If the target
6096 symbol does not really exist, don't do anything. */
6097 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
6099 return (elf_link_output_extsym
6100 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
6103 /* Give the processor backend a chance to tweak the symbol value,
6104 and also to finish up anything that needs to be done for this
6105 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6106 forced local syms when non-shared is due to a historical quirk. */
6107 if ((h
->dynindx
!= -1
6108 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
6109 && (finfo
->info
->shared
6110 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
6111 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6113 struct elf_backend_data
*bed
;
6115 bed
= get_elf_backend_data (finfo
->output_bfd
);
6116 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
6117 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
6119 eoinfo
->failed
= true;
6124 /* If we are marking the symbol as undefined, and there are no
6125 non-weak references to this symbol from a regular object, then
6126 mark the symbol as weak undefined; if there are non-weak
6127 references, mark the symbol as strong. We can't do this earlier,
6128 because it might not be marked as undefined until the
6129 finish_dynamic_symbol routine gets through with it. */
6130 if (sym
.st_shndx
== SHN_UNDEF
6131 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
6132 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
6133 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
6137 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
6138 bindtype
= STB_GLOBAL
;
6140 bindtype
= STB_WEAK
;
6141 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
6144 /* If a symbol is not defined locally, we clear the visibility
6146 if (! finfo
->info
->relocateable
6147 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6148 sym
.st_other
^= ELF_ST_VISIBILITY (sym
.st_other
);
6150 /* If this symbol should be put in the .dynsym section, then put it
6151 there now. We have already know the symbol index. We also fill
6152 in the entry in the .hash section. */
6153 if (h
->dynindx
!= -1
6154 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
6158 size_t hash_entry_size
;
6159 bfd_byte
*bucketpos
;
6161 Elf_External_Sym
*esym
;
6163 sym
.st_name
= h
->dynstr_index
;
6164 esym
= (Elf_External_Sym
*) finfo
->dynsym_sec
->contents
+ h
->dynindx
;
6165 elf_swap_symbol_out (finfo
->output_bfd
, &sym
, (PTR
) esym
, (PTR
) 0);
6167 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
6168 bucket
= h
->elf_hash_value
% bucketcount
;
6170 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
6171 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
6172 + (bucket
+ 2) * hash_entry_size
);
6173 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
6174 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, (bfd_vma
) h
->dynindx
,
6176 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
6177 ((bfd_byte
*) finfo
->hash_sec
->contents
6178 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
6180 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
6182 Elf_Internal_Versym iversym
;
6183 Elf_External_Versym
*eversym
;
6185 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
6187 if (h
->verinfo
.verdef
== NULL
)
6188 iversym
.vs_vers
= 0;
6190 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
6194 if (h
->verinfo
.vertree
== NULL
)
6195 iversym
.vs_vers
= 1;
6197 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
6200 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
6201 iversym
.vs_vers
|= VERSYM_HIDDEN
;
6203 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
6204 eversym
+= h
->dynindx
;
6205 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
6209 /* If we're stripping it, then it was just a dynamic symbol, and
6210 there's nothing else to do. */
6214 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
6216 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
6218 eoinfo
->failed
= true;
6225 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
6226 originated from the section given by INPUT_REL_HDR) to the
6230 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
6233 asection
*input_section
;
6234 Elf_Internal_Shdr
*input_rel_hdr
;
6235 Elf_Internal_Rela
*internal_relocs
;
6237 Elf_Internal_Rela
*irela
;
6238 Elf_Internal_Rela
*irelaend
;
6239 Elf_Internal_Shdr
*output_rel_hdr
;
6240 asection
*output_section
;
6241 unsigned int *rel_countp
= NULL
;
6242 struct elf_backend_data
*bed
;
6245 output_section
= input_section
->output_section
;
6246 output_rel_hdr
= NULL
;
6248 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
6249 == input_rel_hdr
->sh_entsize
)
6251 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
6252 rel_countp
= &elf_section_data (output_section
)->rel_count
;
6254 else if (elf_section_data (output_section
)->rel_hdr2
6255 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
6256 == input_rel_hdr
->sh_entsize
))
6258 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
6259 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
6262 BFD_ASSERT (output_rel_hdr
!= NULL
);
6264 bed
= get_elf_backend_data (output_bfd
);
6265 irela
= internal_relocs
;
6266 irelaend
= irela
+ NUM_SHDR_ENTRIES (input_rel_hdr
)
6267 * bed
->s
->int_rels_per_ext_rel
;
6269 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
6271 Elf_External_Rel
*erel
;
6272 Elf_Internal_Rel
*irel
;
6274 amt
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
6275 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (amt
);
6278 (*_bfd_error_handler
) (_("Error: out of memory"));
6282 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
6283 for (; irela
< irelaend
; irela
+= bed
->s
->int_rels_per_ext_rel
, erel
++)
6287 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
6289 irel
[i
].r_offset
= irela
[i
].r_offset
;
6290 irel
[i
].r_info
= irela
[i
].r_info
;
6291 BFD_ASSERT (irela
[i
].r_addend
== 0);
6294 if (bed
->s
->swap_reloc_out
)
6295 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, (PTR
) erel
);
6297 elf_swap_reloc_out (output_bfd
, irel
, erel
);
6304 Elf_External_Rela
*erela
;
6306 BFD_ASSERT (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
6308 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
6309 for (; irela
< irelaend
; irela
+= bed
->s
->int_rels_per_ext_rel
, erela
++)
6310 if (bed
->s
->swap_reloca_out
)
6311 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (PTR
) erela
);
6313 elf_swap_reloca_out (output_bfd
, irela
, erela
);
6316 /* Bump the counter, so that we know where to add the next set of
6318 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
6321 /* Link an input file into the linker output file. This function
6322 handles all the sections and relocations of the input file at once.
6323 This is so that we only have to read the local symbols once, and
6324 don't have to keep them in memory. */
6327 elf_link_input_bfd (finfo
, input_bfd
)
6328 struct elf_final_link_info
*finfo
;
6331 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
6332 bfd
*, asection
*, bfd_byte
*,
6333 Elf_Internal_Rela
*,
6334 Elf_Internal_Sym
*, asection
**));
6336 Elf_Internal_Shdr
*symtab_hdr
;
6337 Elf_Internal_Shdr
*shndx_hdr
;
6340 Elf_External_Sym
*external_syms
;
6341 Elf_External_Sym
*esym
;
6342 Elf_External_Sym
*esymend
;
6343 Elf_External_Sym_Shndx
*shndx_buf
;
6344 Elf_External_Sym_Shndx
*shndx
;
6345 Elf_Internal_Sym
*isym
;
6347 asection
**ppsection
;
6349 struct elf_backend_data
*bed
;
6350 boolean emit_relocs
;
6351 struct elf_link_hash_entry
**sym_hashes
;
6353 output_bfd
= finfo
->output_bfd
;
6354 bed
= get_elf_backend_data (output_bfd
);
6355 relocate_section
= bed
->elf_backend_relocate_section
;
6357 /* If this is a dynamic object, we don't want to do anything here:
6358 we don't want the local symbols, and we don't want the section
6360 if ((input_bfd
->flags
& DYNAMIC
) != 0)
6363 emit_relocs
= (finfo
->info
->relocateable
6364 || finfo
->info
->emitrelocations
6365 || bed
->elf_backend_emit_relocs
);
6367 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6368 if (elf_bad_symtab (input_bfd
))
6370 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6375 locsymcount
= symtab_hdr
->sh_info
;
6376 extsymoff
= symtab_hdr
->sh_info
;
6379 /* Read the local symbols. */
6380 if (symtab_hdr
->contents
!= NULL
)
6381 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
6382 else if (locsymcount
== 0)
6383 external_syms
= NULL
;
6386 bfd_size_type amt
= locsymcount
* sizeof (Elf_External_Sym
);
6387 external_syms
= finfo
->external_syms
;
6388 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
6389 || bfd_bread (external_syms
, amt
, input_bfd
) != amt
)
6393 shndx_hdr
= &elf_tdata (input_bfd
)->symtab_shndx_hdr
;
6395 if (shndx_hdr
->sh_size
!= 0 && locsymcount
!= 0)
6397 bfd_size_type amt
= locsymcount
* sizeof (Elf_External_Sym_Shndx
);
6398 shndx_buf
= finfo
->locsym_shndx
;
6399 if (bfd_seek (input_bfd
, shndx_hdr
->sh_offset
, SEEK_SET
) != 0
6400 || bfd_bread (shndx_buf
, amt
, input_bfd
) != amt
)
6404 /* Swap in the local symbols and write out the ones which we know
6405 are going into the output file. */
6406 for (esym
= external_syms
, esymend
= esym
+ locsymcount
,
6407 isym
= finfo
->internal_syms
, pindex
= finfo
->indices
,
6408 ppsection
= finfo
->sections
, shndx
= shndx_buf
;
6410 esym
++, isym
++, pindex
++, ppsection
++,
6411 shndx
= (shndx
!= NULL
? shndx
+ 1 : NULL
))
6415 Elf_Internal_Sym osym
;
6417 elf_swap_symbol_in (input_bfd
, esym
, shndx
, isym
);
6420 if (elf_bad_symtab (input_bfd
))
6422 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
6429 if (isym
->st_shndx
== SHN_UNDEF
)
6430 isec
= bfd_und_section_ptr
;
6431 else if (isym
->st_shndx
< SHN_LORESERVE
6432 || isym
->st_shndx
> SHN_HIRESERVE
)
6434 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
6436 && elf_section_data (isec
)->sec_info_type
== ELF_INFO_TYPE_MERGE
6437 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
6439 _bfd_merged_section_offset (output_bfd
, &isec
,
6440 elf_section_data (isec
)->sec_info
,
6441 isym
->st_value
, (bfd_vma
) 0);
6443 else if (isym
->st_shndx
== SHN_ABS
)
6444 isec
= bfd_abs_section_ptr
;
6445 else if (isym
->st_shndx
== SHN_COMMON
)
6446 isec
= bfd_com_section_ptr
;
6455 /* Don't output the first, undefined, symbol. */
6456 if (esym
== external_syms
)
6459 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6461 /* We never output section symbols. Instead, we use the
6462 section symbol of the corresponding section in the output
6467 /* If we are stripping all symbols, we don't want to output this
6469 if (finfo
->info
->strip
== strip_all
)
6472 /* If we are discarding all local symbols, we don't want to
6473 output this one. If we are generating a relocateable output
6474 file, then some of the local symbols may be required by
6475 relocs; we output them below as we discover that they are
6477 if (finfo
->info
->discard
== discard_all
)
6480 /* If this symbol is defined in a section which we are
6481 discarding, we don't need to keep it, but note that
6482 linker_mark is only reliable for sections that have contents.
6483 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6484 as well as linker_mark. */
6485 if ((isym
->st_shndx
< SHN_LORESERVE
|| isym
->st_shndx
> SHN_HIRESERVE
)
6487 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
6488 || (! finfo
->info
->relocateable
6489 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
6492 /* Get the name of the symbol. */
6493 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
6498 /* See if we are discarding symbols with this name. */
6499 if ((finfo
->info
->strip
== strip_some
6500 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
6502 || (((finfo
->info
->discard
== discard_sec_merge
6503 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocateable
)
6504 || finfo
->info
->discard
== discard_l
)
6505 && bfd_is_local_label_name (input_bfd
, name
)))
6508 /* If we get here, we are going to output this symbol. */
6512 /* Adjust the section index for the output file. */
6513 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
6514 isec
->output_section
);
6515 if (osym
.st_shndx
== SHN_BAD
)
6518 *pindex
= bfd_get_symcount (output_bfd
);
6520 /* ELF symbols in relocateable files are section relative, but
6521 in executable files they are virtual addresses. Note that
6522 this code assumes that all ELF sections have an associated
6523 BFD section with a reasonable value for output_offset; below
6524 we assume that they also have a reasonable value for
6525 output_section. Any special sections must be set up to meet
6526 these requirements. */
6527 osym
.st_value
+= isec
->output_offset
;
6528 if (! finfo
->info
->relocateable
)
6529 osym
.st_value
+= isec
->output_section
->vma
;
6531 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
6535 /* Relocate the contents of each section. */
6536 sym_hashes
= elf_sym_hashes (input_bfd
);
6537 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
6541 if (! o
->linker_mark
)
6543 /* This section was omitted from the link. */
6547 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
6548 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
6551 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
6553 /* Section was created by elf_link_create_dynamic_sections
6558 /* Get the contents of the section. They have been cached by a
6559 relaxation routine. Note that o is a section in an input
6560 file, so the contents field will not have been set by any of
6561 the routines which work on output files. */
6562 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
6563 contents
= elf_section_data (o
)->this_hdr
.contents
;
6566 contents
= finfo
->contents
;
6567 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
6568 (file_ptr
) 0, o
->_raw_size
))
6572 if ((o
->flags
& SEC_RELOC
) != 0)
6574 Elf_Internal_Rela
*internal_relocs
;
6576 /* Get the swapped relocs. */
6577 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6578 (input_bfd
, o
, finfo
->external_relocs
,
6579 finfo
->internal_relocs
, false));
6580 if (internal_relocs
== NULL
6581 && o
->reloc_count
> 0)
6584 /* Run through the relocs looking for any against symbols
6585 from discarded sections and section symbols from
6586 removed link-once sections. Complain about relocs
6587 against discarded sections. Zero relocs against removed
6588 link-once sections. We should really complain if
6589 anything in the final link tries to use it, but
6590 DWARF-based exception handling might have an entry in
6591 .eh_frame to describe a routine in the linkonce section,
6592 and it turns out to be hard to remove the .eh_frame
6593 entry too. FIXME. */
6594 if (!finfo
->info
->relocateable
6595 && !elf_section_ignore_discarded_relocs (o
))
6597 Elf_Internal_Rela
*rel
, *relend
;
6599 rel
= internal_relocs
;
6600 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6601 for ( ; rel
< relend
; rel
++)
6603 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
6605 if (r_symndx
>= locsymcount
6606 || (elf_bad_symtab (input_bfd
)
6607 && finfo
->sections
[r_symndx
] == NULL
))
6609 struct elf_link_hash_entry
*h
;
6611 h
= sym_hashes
[r_symndx
- extsymoff
];
6612 while (h
->root
.type
== bfd_link_hash_indirect
6613 || h
->root
.type
== bfd_link_hash_warning
)
6614 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
6616 /* Complain if the definition comes from a
6617 discarded section. */
6618 if ((h
->root
.type
== bfd_link_hash_defined
6619 || h
->root
.type
== bfd_link_hash_defweak
)
6620 && elf_discarded_section (h
->root
.u
.def
.section
))
6622 #if BFD_VERSION_DATE < 20031005
6623 if ((o
->flags
& SEC_DEBUGGING
) != 0)
6625 #if BFD_VERSION_DATE > 20021005
6626 (*finfo
->info
->callbacks
->warning
)
6628 _("warning: relocation against removed section; zeroing"),
6629 NULL
, input_bfd
, o
, rel
->r_offset
);
6631 BFD_ASSERT (r_symndx
!= 0);
6632 memset (rel
, 0, sizeof (*rel
));
6637 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
6638 (finfo
->info
, h
->root
.root
.string
,
6639 input_bfd
, o
, rel
->r_offset
,
6647 asection
*sec
= finfo
->sections
[r_symndx
];
6649 if (sec
!= NULL
&& elf_discarded_section (sec
))
6651 #if BFD_VERSION_DATE < 20031005
6652 if ((o
->flags
& SEC_DEBUGGING
) != 0
6653 || (sec
->flags
& SEC_LINK_ONCE
) != 0)
6655 #if BFD_VERSION_DATE > 20021005
6656 (*finfo
->info
->callbacks
->warning
)
6658 _("warning: relocation against removed section"),
6659 NULL
, input_bfd
, o
, rel
->r_offset
);
6661 BFD_ASSERT (r_symndx
!= 0);
6663 = ELF_R_INFO (0, ELF_R_TYPE (rel
->r_info
));
6671 = _("local symbols in discarded section %s");
6673 = strlen (sec
->name
) + strlen (msg
) - 1;
6674 char *buf
= (char *) bfd_malloc (amt
);
6677 sprintf (buf
, msg
, sec
->name
);
6679 buf
= (char *) sec
->name
;
6680 ok
= (*finfo
->info
->callbacks
6681 ->undefined_symbol
) (finfo
->info
, buf
,
6685 if (buf
!= sec
->name
)
6695 /* Relocate the section by invoking a back end routine.
6697 The back end routine is responsible for adjusting the
6698 section contents as necessary, and (if using Rela relocs
6699 and generating a relocateable output file) adjusting the
6700 reloc addend as necessary.
6702 The back end routine does not have to worry about setting
6703 the reloc address or the reloc symbol index.
6705 The back end routine is given a pointer to the swapped in
6706 internal symbols, and can access the hash table entries
6707 for the external symbols via elf_sym_hashes (input_bfd).
6709 When generating relocateable output, the back end routine
6710 must handle STB_LOCAL/STT_SECTION symbols specially. The
6711 output symbol is going to be a section symbol
6712 corresponding to the output section, which will require
6713 the addend to be adjusted. */
6715 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
6716 input_bfd
, o
, contents
,
6718 finfo
->internal_syms
,
6724 Elf_Internal_Rela
*irela
;
6725 Elf_Internal_Rela
*irelaend
;
6726 struct elf_link_hash_entry
**rel_hash
;
6727 Elf_Internal_Shdr
*input_rel_hdr
;
6728 unsigned int next_erel
;
6729 void (*reloc_emitter
) PARAMS ((bfd
*, asection
*,
6730 Elf_Internal_Shdr
*,
6731 Elf_Internal_Rela
*));
6733 /* Adjust the reloc addresses and symbol indices. */
6735 irela
= internal_relocs
;
6736 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6737 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
6738 + elf_section_data (o
->output_section
)->rel_count
6739 + elf_section_data (o
->output_section
)->rel_count2
);
6740 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
6742 unsigned long r_symndx
;
6745 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
6751 irela
->r_offset
+= o
->output_offset
;
6753 /* Relocs in an executable have to be virtual addresses. */
6754 if (finfo
->info
->emitrelocations
)
6755 irela
->r_offset
+= o
->output_section
->vma
;
6757 r_symndx
= ELF_R_SYM (irela
->r_info
);
6762 if (r_symndx
>= locsymcount
6763 || (elf_bad_symtab (input_bfd
)
6764 && finfo
->sections
[r_symndx
] == NULL
))
6766 struct elf_link_hash_entry
*rh
;
6769 /* This is a reloc against a global symbol. We
6770 have not yet output all the local symbols, so
6771 we do not know the symbol index of any global
6772 symbol. We set the rel_hash entry for this
6773 reloc to point to the global hash table entry
6774 for this symbol. The symbol index is then
6775 set at the end of elf_bfd_final_link. */
6776 indx
= r_symndx
- extsymoff
;
6777 rh
= elf_sym_hashes (input_bfd
)[indx
];
6778 while (rh
->root
.type
== bfd_link_hash_indirect
6779 || rh
->root
.type
== bfd_link_hash_warning
)
6780 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
6782 /* Setting the index to -2 tells
6783 elf_link_output_extsym that this symbol is
6785 BFD_ASSERT (rh
->indx
< 0);
6793 /* This is a reloc against a local symbol. */
6796 isym
= finfo
->internal_syms
+ r_symndx
;
6797 sec
= finfo
->sections
[r_symndx
];
6798 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
6800 /* I suppose the backend ought to fill in the
6801 section of any STT_SECTION symbol against a
6802 processor specific section. If we have
6803 discarded a section, the output_section will
6804 be the absolute section. */
6806 && (bfd_is_abs_section (sec
)
6807 || (sec
->output_section
!= NULL
6808 && bfd_is_abs_section (sec
->output_section
))))
6810 else if (sec
== NULL
|| sec
->owner
== NULL
)
6812 bfd_set_error (bfd_error_bad_value
);
6817 r_symndx
= sec
->output_section
->target_index
;
6818 BFD_ASSERT (r_symndx
!= 0);
6823 if (finfo
->indices
[r_symndx
] == -1)
6825 unsigned long shlink
;
6829 if (finfo
->info
->strip
== strip_all
)
6831 /* You can't do ld -r -s. */
6832 bfd_set_error (bfd_error_invalid_operation
);
6836 /* This symbol was skipped earlier, but
6837 since it is needed by a reloc, we
6838 must output it now. */
6839 shlink
= symtab_hdr
->sh_link
;
6840 name
= (bfd_elf_string_from_elf_section
6841 (input_bfd
, shlink
, isym
->st_name
));
6845 osec
= sec
->output_section
;
6847 _bfd_elf_section_from_bfd_section (output_bfd
,
6849 if (isym
->st_shndx
== SHN_BAD
)
6852 isym
->st_value
+= sec
->output_offset
;
6853 if (! finfo
->info
->relocateable
)
6854 isym
->st_value
+= osec
->vma
;
6856 finfo
->indices
[r_symndx
]
6857 = bfd_get_symcount (output_bfd
);
6859 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
6863 r_symndx
= finfo
->indices
[r_symndx
];
6866 irela
->r_info
= ELF_R_INFO (r_symndx
,
6867 ELF_R_TYPE (irela
->r_info
));
6870 /* Swap out the relocs. */
6871 if (bed
->elf_backend_emit_relocs
6872 && !(finfo
->info
->relocateable
6873 || finfo
->info
->emitrelocations
))
6874 reloc_emitter
= bed
->elf_backend_emit_relocs
;
6876 reloc_emitter
= elf_link_output_relocs
;
6878 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
6879 (*reloc_emitter
) (output_bfd
, o
, input_rel_hdr
, internal_relocs
);
6881 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
6884 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
6885 * bed
->s
->int_rels_per_ext_rel
);
6886 reloc_emitter (output_bfd
, o
, input_rel_hdr
, internal_relocs
);
6892 /* Write out the modified section contents. */
6893 if (bed
->elf_backend_write_section
6894 && (*bed
->elf_backend_write_section
) (output_bfd
, o
, contents
))
6896 /* Section written out. */
6898 else switch (elf_section_data (o
)->sec_info_type
)
6900 case ELF_INFO_TYPE_STABS
:
6901 if (! (_bfd_write_section_stabs
6903 &elf_hash_table (finfo
->info
)->stab_info
,
6904 o
, &elf_section_data (o
)->sec_info
, contents
)))
6907 case ELF_INFO_TYPE_MERGE
:
6908 if (! (_bfd_write_merged_section
6909 (output_bfd
, o
, elf_section_data (o
)->sec_info
)))
6912 case ELF_INFO_TYPE_EH_FRAME
:
6917 = bfd_get_section_by_name (elf_hash_table (finfo
->info
)->dynobj
,
6919 if (! (_bfd_elf_write_section_eh_frame (output_bfd
, o
, ehdrsec
,
6926 bfd_size_type sec_size
;
6928 sec_size
= (o
->_cooked_size
!= 0 ? o
->_cooked_size
: o
->_raw_size
);
6929 if (! (o
->flags
& SEC_EXCLUDE
)
6930 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
6932 (file_ptr
) o
->output_offset
,
6943 /* Generate a reloc when linking an ELF file. This is a reloc
6944 requested by the linker, and does come from any input file. This
6945 is used to build constructor and destructor tables when linking
6949 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
6951 struct bfd_link_info
*info
;
6952 asection
*output_section
;
6953 struct bfd_link_order
*link_order
;
6955 reloc_howto_type
*howto
;
6959 struct elf_link_hash_entry
**rel_hash_ptr
;
6960 Elf_Internal_Shdr
*rel_hdr
;
6961 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
6963 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
6966 bfd_set_error (bfd_error_bad_value
);
6970 addend
= link_order
->u
.reloc
.p
->addend
;
6972 /* Figure out the symbol index. */
6973 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
6974 + elf_section_data (output_section
)->rel_count
6975 + elf_section_data (output_section
)->rel_count2
);
6976 if (link_order
->type
== bfd_section_reloc_link_order
)
6978 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
6979 BFD_ASSERT (indx
!= 0);
6980 *rel_hash_ptr
= NULL
;
6984 struct elf_link_hash_entry
*h
;
6986 /* Treat a reloc against a defined symbol as though it were
6987 actually against the section. */
6988 h
= ((struct elf_link_hash_entry
*)
6989 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
6990 link_order
->u
.reloc
.p
->u
.name
,
6991 false, false, true));
6993 && (h
->root
.type
== bfd_link_hash_defined
6994 || h
->root
.type
== bfd_link_hash_defweak
))
6998 section
= h
->root
.u
.def
.section
;
6999 indx
= section
->output_section
->target_index
;
7000 *rel_hash_ptr
= NULL
;
7001 /* It seems that we ought to add the symbol value to the
7002 addend here, but in practice it has already been added
7003 because it was passed to constructor_callback. */
7004 addend
+= section
->output_section
->vma
+ section
->output_offset
;
7008 /* Setting the index to -2 tells elf_link_output_extsym that
7009 this symbol is used by a reloc. */
7016 if (! ((*info
->callbacks
->unattached_reloc
)
7017 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
7018 (asection
*) NULL
, (bfd_vma
) 0)))
7024 /* If this is an inplace reloc, we must write the addend into the
7026 if (howto
->partial_inplace
&& addend
!= 0)
7029 bfd_reloc_status_type rstat
;
7032 const char *sym_name
;
7034 size
= bfd_get_reloc_size (howto
);
7035 buf
= (bfd_byte
*) bfd_zmalloc (size
);
7036 if (buf
== (bfd_byte
*) NULL
)
7038 rstat
= _bfd_relocate_contents (howto
, output_bfd
, (bfd_vma
) addend
, buf
);
7045 case bfd_reloc_outofrange
:
7048 case bfd_reloc_overflow
:
7049 if (link_order
->type
== bfd_section_reloc_link_order
)
7050 sym_name
= bfd_section_name (output_bfd
,
7051 link_order
->u
.reloc
.p
->u
.section
);
7053 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
7054 if (! ((*info
->callbacks
->reloc_overflow
)
7055 (info
, sym_name
, howto
->name
, addend
,
7056 (bfd
*) NULL
, (asection
*) NULL
, (bfd_vma
) 0)))
7063 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
7064 (file_ptr
) link_order
->offset
, size
);
7070 /* The address of a reloc is relative to the section in a
7071 relocateable file, and is a virtual address in an executable
7073 offset
= link_order
->offset
;
7074 if (! info
->relocateable
)
7075 offset
+= output_section
->vma
;
7077 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
7079 if (rel_hdr
->sh_type
== SHT_REL
)
7082 Elf_Internal_Rel
*irel
;
7083 Elf_External_Rel
*erel
;
7086 size
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rel
);
7087 irel
= (Elf_Internal_Rel
*) bfd_zmalloc (size
);
7091 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7092 irel
[i
].r_offset
= offset
;
7093 irel
[0].r_info
= ELF_R_INFO (indx
, howto
->type
);
7095 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
7096 + elf_section_data (output_section
)->rel_count
);
7098 if (bed
->s
->swap_reloc_out
)
7099 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, (bfd_byte
*) erel
);
7101 elf_swap_reloc_out (output_bfd
, irel
, erel
);
7108 Elf_Internal_Rela
*irela
;
7109 Elf_External_Rela
*erela
;
7112 size
= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
7113 irela
= (Elf_Internal_Rela
*) bfd_zmalloc (size
);
7117 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7118 irela
[i
].r_offset
= offset
;
7119 irela
[0].r_info
= ELF_R_INFO (indx
, howto
->type
);
7120 irela
[0].r_addend
= addend
;
7122 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
7123 + elf_section_data (output_section
)->rel_count
);
7125 if (bed
->s
->swap_reloca_out
)
7126 (*bed
->s
->swap_reloca_out
) (output_bfd
, irela
, (bfd_byte
*) erela
);
7128 elf_swap_reloca_out (output_bfd
, irela
, erela
);
7131 ++elf_section_data (output_section
)->rel_count
;
7136 /* Allocate a pointer to live in a linker created section. */
7139 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
7141 struct bfd_link_info
*info
;
7142 elf_linker_section_t
*lsect
;
7143 struct elf_link_hash_entry
*h
;
7144 const Elf_Internal_Rela
*rel
;
7146 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
7147 elf_linker_section_pointers_t
*linker_section_ptr
;
7148 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7151 BFD_ASSERT (lsect
!= NULL
);
7153 /* Is this a global symbol? */
7156 /* Has this symbol already been allocated? If so, our work is done. */
7157 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
7162 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
7163 /* Make sure this symbol is output as a dynamic symbol. */
7164 if (h
->dynindx
== -1)
7166 if (! elf_link_record_dynamic_symbol (info
, h
))
7170 if (lsect
->rel_section
)
7171 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7175 /* Allocation of a pointer to a local symbol. */
7176 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
7178 /* Allocate a table to hold the local symbols if first time. */
7181 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
7182 register unsigned int i
;
7185 amt
*= sizeof (elf_linker_section_pointers_t
*);
7186 ptr
= (elf_linker_section_pointers_t
**) bfd_alloc (abfd
, amt
);
7191 elf_local_ptr_offsets (abfd
) = ptr
;
7192 for (i
= 0; i
< num_symbols
; i
++)
7193 ptr
[i
] = (elf_linker_section_pointers_t
*) 0;
7196 /* Has this symbol already been allocated? If so, our work is done. */
7197 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
7202 ptr_linker_section_ptr
= &ptr
[r_symndx
];
7206 /* If we are generating a shared object, we need to
7207 output a R_<xxx>_RELATIVE reloc so that the
7208 dynamic linker can adjust this GOT entry. */
7209 BFD_ASSERT (lsect
->rel_section
!= NULL
);
7210 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
7214 /* Allocate space for a pointer in the linker section, and allocate
7215 a new pointer record from internal memory. */
7216 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
7217 amt
= sizeof (elf_linker_section_pointers_t
);
7218 linker_section_ptr
= (elf_linker_section_pointers_t
*) bfd_alloc (abfd
, amt
);
7220 if (!linker_section_ptr
)
7223 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
7224 linker_section_ptr
->addend
= rel
->r_addend
;
7225 linker_section_ptr
->which
= lsect
->which
;
7226 linker_section_ptr
->written_address_p
= false;
7227 *ptr_linker_section_ptr
= linker_section_ptr
;
7230 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
7232 linker_section_ptr
->offset
= (lsect
->section
->_raw_size
7233 - lsect
->hole_size
+ (ARCH_SIZE
/ 8));
7234 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
7235 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
7236 if (lsect
->sym_hash
)
7238 /* Bump up symbol value if needed. */
7239 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
7241 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
7242 lsect
->sym_hash
->root
.root
.string
,
7243 (long) ARCH_SIZE
/ 8,
7244 (long) lsect
->sym_hash
->root
.u
.def
.value
);
7250 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
7252 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
7256 "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
7257 lsect
->name
, (long) linker_section_ptr
->offset
,
7258 (long) lsect
->section
->_raw_size
);
7265 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
7268 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
7271 /* Fill in the address for a pointer generated in a linker section. */
7274 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
,
7275 relocation
, rel
, relative_reloc
)
7278 struct bfd_link_info
*info
;
7279 elf_linker_section_t
*lsect
;
7280 struct elf_link_hash_entry
*h
;
7282 const Elf_Internal_Rela
*rel
;
7285 elf_linker_section_pointers_t
*linker_section_ptr
;
7287 BFD_ASSERT (lsect
!= NULL
);
7291 /* Handle global symbol. */
7292 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7293 (h
->linker_section_pointer
,
7297 BFD_ASSERT (linker_section_ptr
!= NULL
);
7299 if (! elf_hash_table (info
)->dynamic_sections_created
7302 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
7304 /* This is actually a static link, or it is a
7305 -Bsymbolic link and the symbol is defined
7306 locally. We must initialize this entry in the
7309 When doing a dynamic link, we create a .rela.<xxx>
7310 relocation entry to initialize the value. This
7311 is done in the finish_dynamic_symbol routine. */
7312 if (!linker_section_ptr
->written_address_p
)
7314 linker_section_ptr
->written_address_p
= true;
7315 bfd_put_ptr (output_bfd
,
7316 relocation
+ linker_section_ptr
->addend
,
7317 (lsect
->section
->contents
7318 + linker_section_ptr
->offset
));
7324 /* Handle local symbol. */
7325 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
7326 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
7327 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
7328 linker_section_ptr
= (_bfd_elf_find_pointer_linker_section
7329 (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
7333 BFD_ASSERT (linker_section_ptr
!= NULL
);
7335 /* Write out pointer if it hasn't been rewritten out before. */
7336 if (!linker_section_ptr
->written_address_p
)
7338 linker_section_ptr
->written_address_p
= true;
7339 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
7340 lsect
->section
->contents
+ linker_section_ptr
->offset
);
7344 asection
*srel
= lsect
->rel_section
;
7345 Elf_Internal_Rela
*outrel
;
7346 Elf_External_Rela
*erel
;
7347 struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
7351 amt
= sizeof (Elf_Internal_Rela
) * bed
->s
->int_rels_per_ext_rel
;
7352 outrel
= (Elf_Internal_Rela
*) bfd_zmalloc (amt
);
7355 (*_bfd_error_handler
) (_("Error: out of memory"));
7359 /* We need to generate a relative reloc for the dynamic
7363 srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
7365 lsect
->rel_section
= srel
;
7368 BFD_ASSERT (srel
!= NULL
);
7370 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
7371 outrel
[i
].r_offset
= (lsect
->section
->output_section
->vma
7372 + lsect
->section
->output_offset
7373 + linker_section_ptr
->offset
);
7374 outrel
[0].r_info
= ELF_R_INFO (0, relative_reloc
);
7375 outrel
[0].r_addend
= 0;
7376 erel
= (Elf_External_Rela
*) lsect
->section
->contents
;
7377 erel
+= elf_section_data (lsect
->section
)->rel_count
;
7378 elf_swap_reloca_out (output_bfd
, outrel
, erel
);
7379 ++elf_section_data (lsect
->section
)->rel_count
;
7386 relocation
= (lsect
->section
->output_offset
7387 + linker_section_ptr
->offset
7388 - lsect
->hole_offset
7389 - lsect
->sym_offset
);
7393 "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
7394 lsect
->name
, (long) relocation
, (long) relocation
);
7397 /* Subtract out the addend, because it will get added back in by the normal
7399 return relocation
- linker_section_ptr
->addend
;
7402 /* Garbage collect unused sections. */
7404 static boolean elf_gc_mark
7405 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
7406 asection
* (*gc_mark_hook
)
7407 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7408 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
7410 static boolean elf_gc_sweep
7411 PARAMS ((struct bfd_link_info
*info
,
7412 boolean (*gc_sweep_hook
)
7413 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
7414 const Elf_Internal_Rela
*relocs
))));
7416 static boolean elf_gc_sweep_symbol
7417 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
7419 static boolean elf_gc_allocate_got_offsets
7420 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
7422 static boolean elf_gc_propagate_vtable_entries_used
7423 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
7425 static boolean elf_gc_smash_unused_vtentry_relocs
7426 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
7428 /* The mark phase of garbage collection. For a given section, mark
7429 it and any sections in this section's group, and all the sections
7430 which define symbols to which it refers. */
7433 elf_gc_mark (info
, sec
, gc_mark_hook
)
7434 struct bfd_link_info
*info
;
7436 asection
* (*gc_mark_hook
)
7437 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7438 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
7441 asection
*group_sec
;
7445 /* Mark all the sections in the group. */
7446 group_sec
= elf_section_data (sec
)->next_in_group
;
7447 if (group_sec
&& !group_sec
->gc_mark
)
7448 if (!elf_gc_mark (info
, group_sec
, gc_mark_hook
))
7451 /* Look through the section relocs. */
7453 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
7455 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
7456 Elf_Internal_Shdr
*symtab_hdr
;
7457 Elf_Internal_Shdr
*shndx_hdr
;
7458 struct elf_link_hash_entry
**sym_hashes
;
7461 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
7462 Elf_External_Sym_Shndx
*locsym_shndx
;
7463 bfd
*input_bfd
= sec
->owner
;
7464 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
7466 /* GCFIXME: how to arrange so that relocs and symbols are not
7467 reread continually? */
7469 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
7470 sym_hashes
= elf_sym_hashes (input_bfd
);
7472 /* Read the local symbols. */
7473 if (elf_bad_symtab (input_bfd
))
7475 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
7479 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
7481 if (symtab_hdr
->contents
)
7482 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
7483 else if (nlocsyms
== 0)
7487 bfd_size_type amt
= nlocsyms
* sizeof (Elf_External_Sym
);
7488 locsyms
= freesyms
= bfd_malloc (amt
);
7489 if (freesyms
== NULL
7490 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
7491 || bfd_bread (locsyms
, amt
, input_bfd
) != amt
)
7498 shndx_hdr
= &elf_tdata (input_bfd
)->symtab_shndx_hdr
;
7499 locsym_shndx
= NULL
;
7500 if (shndx_hdr
->sh_size
!= 0 && nlocsyms
!= 0)
7502 bfd_size_type amt
= nlocsyms
* sizeof (Elf_External_Sym_Shndx
);
7503 locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
7504 if (bfd_seek (input_bfd
, shndx_hdr
->sh_offset
, SEEK_SET
) != 0
7505 || bfd_bread (locsym_shndx
, amt
, input_bfd
) != amt
)
7509 /* Read the relocations. */
7510 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7511 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
7512 info
->keep_memory
));
7513 if (relstart
== NULL
)
7518 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7520 for (rel
= relstart
; rel
< relend
; rel
++)
7522 unsigned long r_symndx
;
7524 struct elf_link_hash_entry
*h
;
7527 r_symndx
= ELF_R_SYM (rel
->r_info
);
7531 if (elf_bad_symtab (sec
->owner
))
7533 elf_swap_symbol_in (input_bfd
,
7535 locsym_shndx
+ (locsym_shndx
? r_symndx
: 0),
7537 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
7538 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, NULL
, &s
);
7541 h
= sym_hashes
[r_symndx
- extsymoff
];
7542 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, h
, NULL
);
7545 else if (r_symndx
>= nlocsyms
)
7547 h
= sym_hashes
[r_symndx
- extsymoff
];
7548 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, h
, NULL
);
7552 elf_swap_symbol_in (input_bfd
,
7554 locsym_shndx
+ (locsym_shndx
? r_symndx
: 0),
7556 rsec
= (*gc_mark_hook
) (sec
->owner
, info
, rel
, NULL
, &s
);
7559 if (rsec
&& !rsec
->gc_mark
)
7560 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
7568 if (!info
->keep_memory
)
7578 /* The sweep phase of garbage collection. Remove all garbage sections. */
7581 elf_gc_sweep (info
, gc_sweep_hook
)
7582 struct bfd_link_info
*info
;
7583 boolean (*gc_sweep_hook
)
7584 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
7585 const Elf_Internal_Rela
*relocs
));
7589 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7593 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
7596 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7598 /* Keep special sections. Keep .debug sections. */
7599 if ((o
->flags
& SEC_LINKER_CREATED
)
7600 || (o
->flags
& SEC_DEBUGGING
))
7606 /* Skip sweeping sections already excluded. */
7607 if (o
->flags
& SEC_EXCLUDE
)
7610 /* Since this is early in the link process, it is simple
7611 to remove a section from the output. */
7612 o
->flags
|= SEC_EXCLUDE
;
7614 /* But we also have to update some of the relocation
7615 info we collected before. */
7617 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
7619 Elf_Internal_Rela
*internal_relocs
;
7622 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
7623 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
7624 if (internal_relocs
== NULL
)
7627 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
7629 if (!info
->keep_memory
)
7630 free (internal_relocs
);
7638 /* Remove the symbols that were in the swept sections from the dynamic
7639 symbol table. GCFIXME: Anyone know how to get them out of the
7640 static symbol table as well? */
7644 elf_link_hash_traverse (elf_hash_table (info
),
7645 elf_gc_sweep_symbol
,
7648 elf_hash_table (info
)->dynsymcount
= i
;
7654 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
7657 elf_gc_sweep_symbol (h
, idxptr
)
7658 struct elf_link_hash_entry
*h
;
7661 int *idx
= (int *) idxptr
;
7663 if (h
->dynindx
!= -1
7664 && ((h
->root
.type
!= bfd_link_hash_defined
7665 && h
->root
.type
!= bfd_link_hash_defweak
)
7666 || h
->root
.u
.def
.section
->gc_mark
))
7667 h
->dynindx
= (*idx
)++;
7672 /* Propogate collected vtable information. This is called through
7673 elf_link_hash_traverse. */
7676 elf_gc_propagate_vtable_entries_used (h
, okp
)
7677 struct elf_link_hash_entry
*h
;
7680 /* Those that are not vtables. */
7681 if (h
->vtable_parent
== NULL
)
7684 /* Those vtables that do not have parents, we cannot merge. */
7685 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
7688 /* If we've already been done, exit. */
7689 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
7692 /* Make sure the parent's table is up to date. */
7693 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
7695 if (h
->vtable_entries_used
== NULL
)
7697 /* None of this table's entries were referenced. Re-use the
7699 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
7700 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
7707 /* Or the parent's entries into ours. */
7708 cu
= h
->vtable_entries_used
;
7710 pu
= h
->vtable_parent
->vtable_entries_used
;
7713 asection
*sec
= h
->root
.u
.def
.section
;
7714 struct elf_backend_data
*bed
= get_elf_backend_data (sec
->owner
);
7715 int file_align
= bed
->s
->file_align
;
7717 n
= h
->vtable_parent
->vtable_entries_size
/ file_align
;
7732 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
7733 struct elf_link_hash_entry
*h
;
7737 bfd_vma hstart
, hend
;
7738 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
7739 struct elf_backend_data
*bed
;
7742 /* Take care of both those symbols that do not describe vtables as
7743 well as those that are not loaded. */
7744 if (h
->vtable_parent
== NULL
)
7747 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
7748 || h
->root
.type
== bfd_link_hash_defweak
);
7750 sec
= h
->root
.u
.def
.section
;
7751 hstart
= h
->root
.u
.def
.value
;
7752 hend
= hstart
+ h
->size
;
7754 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
7755 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
7757 return *(boolean
*) okp
= false;
7758 bed
= get_elf_backend_data (sec
->owner
);
7759 file_align
= bed
->s
->file_align
;
7761 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
7763 for (rel
= relstart
; rel
< relend
; ++rel
)
7764 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
7766 /* If the entry is in use, do nothing. */
7767 if (h
->vtable_entries_used
7768 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
7770 bfd_vma entry
= (rel
->r_offset
- hstart
) / file_align
;
7771 if (h
->vtable_entries_used
[entry
])
7774 /* Otherwise, kill it. */
7775 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
7781 /* Do mark and sweep of unused sections. */
7784 elf_gc_sections (abfd
, info
)
7786 struct bfd_link_info
*info
;
7790 asection
* (*gc_mark_hook
)
7791 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
7792 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
7794 if (!get_elf_backend_data (abfd
)->can_gc_sections
7795 || info
->relocateable
|| info
->emitrelocations
7796 || elf_hash_table (info
)->dynamic_sections_created
)
7799 /* Apply transitive closure to the vtable entry usage info. */
7800 elf_link_hash_traverse (elf_hash_table (info
),
7801 elf_gc_propagate_vtable_entries_used
,
7806 /* Kill the vtable relocations that were not used. */
7807 elf_link_hash_traverse (elf_hash_table (info
),
7808 elf_gc_smash_unused_vtentry_relocs
,
7813 /* Grovel through relocs to find out who stays ... */
7815 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
7816 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
7820 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
7823 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7825 if (o
->flags
& SEC_KEEP
)
7826 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
7831 /* ... and mark SEC_EXCLUDE for those that go. */
7832 if (!elf_gc_sweep (info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
7838 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
7841 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
7844 struct elf_link_hash_entry
*h
;
7847 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
7848 struct elf_link_hash_entry
**search
, *child
;
7849 bfd_size_type extsymcount
;
7851 /* The sh_info field of the symtab header tells us where the
7852 external symbols start. We don't care about the local symbols at
7854 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
7855 if (!elf_bad_symtab (abfd
))
7856 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
7858 sym_hashes
= elf_sym_hashes (abfd
);
7859 sym_hashes_end
= sym_hashes
+ extsymcount
;
7861 /* Hunt down the child symbol, which is in this section at the same
7862 offset as the relocation. */
7863 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
7865 if ((child
= *search
) != NULL
7866 && (child
->root
.type
== bfd_link_hash_defined
7867 || child
->root
.type
== bfd_link_hash_defweak
)
7868 && child
->root
.u
.def
.section
== sec
7869 && child
->root
.u
.def
.value
== offset
)
7873 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
7874 bfd_archive_filename (abfd
), sec
->name
,
7875 (unsigned long) offset
);
7876 bfd_set_error (bfd_error_invalid_operation
);
7882 /* This *should* only be the absolute section. It could potentially
7883 be that someone has defined a non-global vtable though, which
7884 would be bad. It isn't worth paging in the local symbols to be
7885 sure though; that case should simply be handled by the assembler. */
7887 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
7890 child
->vtable_parent
= h
;
7895 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
7898 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
7899 bfd
*abfd ATTRIBUTE_UNUSED
;
7900 asection
*sec ATTRIBUTE_UNUSED
;
7901 struct elf_link_hash_entry
*h
;
7904 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7905 int file_align
= bed
->s
->file_align
;
7907 if (addend
>= h
->vtable_entries_size
)
7910 boolean
*ptr
= h
->vtable_entries_used
;
7912 /* While the symbol is undefined, we have to be prepared to handle
7914 if (h
->root
.type
== bfd_link_hash_undefined
)
7921 /* Oops! We've got a reference past the defined end of
7922 the table. This is probably a bug -- shall we warn? */
7927 /* Allocate one extra entry for use as a "done" flag for the
7928 consolidation pass. */
7929 bytes
= (size
/ file_align
+ 1) * sizeof (boolean
);
7933 ptr
= bfd_realloc (ptr
- 1, (bfd_size_type
) bytes
);
7939 oldbytes
= ((h
->vtable_entries_size
/ file_align
+ 1)
7940 * sizeof (boolean
));
7941 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
7945 ptr
= bfd_zmalloc ((bfd_size_type
) bytes
);
7950 /* And arrange for that done flag to be at index -1. */
7951 h
->vtable_entries_used
= ptr
+ 1;
7952 h
->vtable_entries_size
= size
;
7955 h
->vtable_entries_used
[addend
/ file_align
] = true;
7960 /* And an accompanying bit to work out final got entry offsets once
7961 we're done. Should be called from final_link. */
7964 elf_gc_common_finalize_got_offsets (abfd
, info
)
7966 struct bfd_link_info
*info
;
7969 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7972 /* The GOT offset is relative to the .got section, but the GOT header is
7973 put into the .got.plt section, if the backend uses it. */
7974 if (bed
->want_got_plt
)
7977 gotoff
= bed
->got_header_size
;
7979 /* Do the local .got entries first. */
7980 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
7982 bfd_signed_vma
*local_got
;
7983 bfd_size_type j
, locsymcount
;
7984 Elf_Internal_Shdr
*symtab_hdr
;
7986 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
7989 local_got
= elf_local_got_refcounts (i
);
7993 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
7994 if (elf_bad_symtab (i
))
7995 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
7997 locsymcount
= symtab_hdr
->sh_info
;
7999 for (j
= 0; j
< locsymcount
; ++j
)
8001 if (local_got
[j
] > 0)
8003 local_got
[j
] = gotoff
;
8004 gotoff
+= ARCH_SIZE
/ 8;
8007 local_got
[j
] = (bfd_vma
) -1;
8011 /* Then the global .got entries. .plt refcounts are handled by
8012 adjust_dynamic_symbol */
8013 elf_link_hash_traverse (elf_hash_table (info
),
8014 elf_gc_allocate_got_offsets
,
8019 /* We need a special top-level link routine to convert got reference counts
8020 to real got offsets. */
8023 elf_gc_allocate_got_offsets (h
, offarg
)
8024 struct elf_link_hash_entry
*h
;
8027 bfd_vma
*off
= (bfd_vma
*) offarg
;
8029 if (h
->got
.refcount
> 0)
8031 h
->got
.offset
= off
[0];
8032 off
[0] += ARCH_SIZE
/ 8;
8035 h
->got
.offset
= (bfd_vma
) -1;
8040 /* Many folk need no more in the way of final link than this, once
8041 got entry reference counting is enabled. */
8044 elf_gc_common_final_link (abfd
, info
)
8046 struct bfd_link_info
*info
;
8048 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
8051 /* Invoke the regular ELF backend linker to do all the work. */
8052 return elf_bfd_final_link (abfd
, info
);
8055 /* This function will be called though elf_link_hash_traverse to store
8056 all hash value of the exported symbols in an array. */
8059 elf_collect_hash_codes (h
, data
)
8060 struct elf_link_hash_entry
*h
;
8063 unsigned long **valuep
= (unsigned long **) data
;
8069 /* Ignore indirect symbols. These are added by the versioning code. */
8070 if (h
->dynindx
== -1)
8073 name
= h
->root
.root
.string
;
8074 p
= strchr (name
, ELF_VER_CHR
);
8077 alc
= bfd_malloc ((bfd_size_type
) (p
- name
+ 1));
8078 memcpy (alc
, name
, (size_t) (p
- name
));
8079 alc
[p
- name
] = '\0';
8083 /* Compute the hash value. */
8084 ha
= bfd_elf_hash (name
);
8086 /* Store the found hash value in the array given as the argument. */
8089 /* And store it in the struct so that we can put it in the hash table
8091 h
->elf_hash_value
= ha
;
8100 elf_reloc_symbol_deleted_p (offset
, cookie
)
8104 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
8106 if (rcookie
->bad_symtab
)
8107 rcookie
->rel
= rcookie
->rels
;
8109 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
8111 unsigned long r_symndx
= ELF_R_SYM (rcookie
->rel
->r_info
);
8112 Elf_Internal_Sym isym
;
8114 if (! rcookie
->bad_symtab
)
8115 if (rcookie
->rel
->r_offset
> offset
)
8117 if (rcookie
->rel
->r_offset
!= offset
)
8120 if (rcookie
->locsyms
&& r_symndx
< rcookie
->locsymcount
)
8122 Elf_External_Sym
*lsym
;
8123 Elf_External_Sym_Shndx
*lshndx
;
8125 lsym
= (Elf_External_Sym
*) rcookie
->locsyms
+ r_symndx
;
8126 lshndx
= (Elf_External_Sym_Shndx
*) rcookie
->locsym_shndx
;
8129 elf_swap_symbol_in (rcookie
->abfd
, lsym
, lshndx
, &isym
);
8132 if (r_symndx
>= rcookie
->locsymcount
8133 || (rcookie
->locsyms
8134 && ELF_ST_BIND (isym
.st_info
) != STB_LOCAL
))
8136 struct elf_link_hash_entry
*h
;
8138 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
8140 while (h
->root
.type
== bfd_link_hash_indirect
8141 || h
->root
.type
== bfd_link_hash_warning
)
8142 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8144 if ((h
->root
.type
== bfd_link_hash_defined
8145 || h
->root
.type
== bfd_link_hash_defweak
)
8146 && elf_discarded_section (h
->root
.u
.def
.section
))
8151 else if (rcookie
->locsyms
)
8153 /* It's not a relocation against a global symbol,
8154 but it could be a relocation against a local
8155 symbol for a discarded section. */
8158 /* Need to: get the symbol; get the section. */
8159 if (isym
.st_shndx
< SHN_LORESERVE
|| isym
.st_shndx
> SHN_HIRESERVE
)
8161 isec
= section_from_elf_index (rcookie
->abfd
, isym
.st_shndx
);
8162 if (isec
!= NULL
&& elf_discarded_section (isec
))
8171 /* Discard unneeded references to discarded sections.
8172 Returns true if any section's size was changed. */
8173 /* This function assumes that the relocations are in sorted order,
8174 which is true for all known assemblers. */
8177 elf_bfd_discard_info (output_bfd
, info
)
8179 struct bfd_link_info
*info
;
8181 struct elf_reloc_cookie cookie
;
8182 asection
*stab
, *eh
, *ehdr
;
8183 Elf_Internal_Shdr
*symtab_hdr
;
8184 Elf_Internal_Shdr
*shndx_hdr
;
8185 Elf_External_Sym
*freesyms
;
8186 struct elf_backend_data
*bed
;
8188 boolean ret
= false;
8189 boolean strip
= info
->strip
== strip_all
|| info
->strip
== strip_debugger
;
8191 if (info
->relocateable
8192 || info
->traditional_format
8193 || info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
8194 || ! is_elf_hash_table (info
))
8198 if (elf_hash_table (info
)->dynobj
!= NULL
)
8199 ehdr
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
8202 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
8204 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
8207 bed
= get_elf_backend_data (abfd
);
8209 if ((abfd
->flags
& DYNAMIC
) != 0)
8215 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
8216 if (eh
&& eh
->_raw_size
== 0)
8220 stab
= strip
? NULL
: bfd_get_section_by_name (abfd
, ".stab");
8221 if ((! stab
|| elf_section_data(stab
)->sec_info_type
!= ELF_INFO_TYPE_STABS
)
8223 && (strip
|| ! bed
->elf_backend_discard_info
))
8226 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8227 shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
8230 cookie
.sym_hashes
= elf_sym_hashes (abfd
);
8231 cookie
.bad_symtab
= elf_bad_symtab (abfd
);
8232 if (cookie
.bad_symtab
)
8234 cookie
.locsymcount
=
8235 symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
8236 cookie
.extsymoff
= 0;
8240 cookie
.locsymcount
= symtab_hdr
->sh_info
;
8241 cookie
.extsymoff
= symtab_hdr
->sh_info
;
8245 if (symtab_hdr
->contents
)
8246 cookie
.locsyms
= (void *) symtab_hdr
->contents
;
8247 else if (cookie
.locsymcount
== 0)
8248 cookie
.locsyms
= NULL
;
8251 bfd_size_type amt
= cookie
.locsymcount
* sizeof (Elf_External_Sym
);
8252 cookie
.locsyms
= bfd_malloc (amt
);
8253 if (cookie
.locsyms
== NULL
)
8255 freesyms
= cookie
.locsyms
;
8256 if (bfd_seek (abfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
8257 || bfd_bread (cookie
.locsyms
, amt
, abfd
) != amt
)
8260 free (cookie
.locsyms
);
8265 cookie
.locsym_shndx
= NULL
;
8266 if (shndx_hdr
->sh_size
!= 0 && cookie
.locsymcount
!= 0)
8269 amt
= cookie
.locsymcount
* sizeof (Elf_External_Sym_Shndx
);
8270 cookie
.locsym_shndx
= bfd_malloc (amt
);
8271 if (cookie
.locsym_shndx
== NULL
)
8272 goto error_ret_free_loc
;
8273 if (bfd_seek (abfd
, shndx_hdr
->sh_offset
, SEEK_SET
) != 0
8274 || bfd_bread (cookie
.locsym_shndx
, amt
, abfd
) != amt
)
8276 free (cookie
.locsym_shndx
);
8277 goto error_ret_free_loc
;
8283 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8284 (abfd
, stab
, (PTR
) NULL
,
8285 (Elf_Internal_Rela
*) NULL
,
8286 info
->keep_memory
));
8289 cookie
.rel
= cookie
.rels
;
8291 cookie
.rels
+ stab
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8292 if (_bfd_discard_section_stabs (abfd
, stab
,
8293 elf_section_data (stab
)->sec_info
,
8294 elf_reloc_symbol_deleted_p
,
8297 if (! info
->keep_memory
)
8306 cookie
.relend
= NULL
;
8307 if (eh
->reloc_count
)
8308 cookie
.rels
= (NAME(_bfd_elf
,link_read_relocs
)
8309 (abfd
, eh
, (PTR
) NULL
,
8310 (Elf_Internal_Rela
*) NULL
,
8311 info
->keep_memory
));
8314 cookie
.rel
= cookie
.rels
;
8316 cookie
.rels
+ eh
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
8318 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
, ehdr
,
8319 elf_reloc_symbol_deleted_p
,
8322 if (! info
->keep_memory
)
8326 if (bed
->elf_backend_discard_info
)
8328 if (bed
->elf_backend_discard_info (abfd
, &cookie
, info
))
8332 if (cookie
.locsym_shndx
!= NULL
)
8333 free (cookie
.locsym_shndx
);
8335 if (freesyms
!= NULL
)
8340 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
,
8347 elf_section_ignore_discarded_relocs (sec
)
8350 switch (elf_section_data (sec
)->sec_info_type
)
8352 case ELF_INFO_TYPE_STABS
:
8353 case ELF_INFO_TYPE_EH_FRAME
:
8358 if ((get_elf_backend_data (sec
->owner
)->elf_backend_ignore_discarded_relocs
8360 && (*get_elf_backend_data (sec
->owner
)
8361 ->elf_backend_ignore_discarded_relocs
) (sec
))