2 Copyright 1995, 1996, 1997 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 static boolean elf_link_add_object_symbols
23 PARAMS ((bfd
*, struct bfd_link_info
*));
24 static boolean elf_link_add_archive_symbols
25 PARAMS ((bfd
*, struct bfd_link_info
*));
26 static boolean elf_export_symbol
27 PARAMS ((struct elf_link_hash_entry
*, PTR
));
28 static boolean elf_adjust_dynamic_symbol
29 PARAMS ((struct elf_link_hash_entry
*, PTR
));
30 static boolean elf_link_find_version_dependencies
31 PARAMS ((struct elf_link_hash_entry
*, PTR
));
32 static boolean elf_link_find_version_dependencies
33 PARAMS ((struct elf_link_hash_entry
*, PTR
));
34 static boolean elf_link_assign_sym_version
35 PARAMS ((struct elf_link_hash_entry
*, PTR
));
36 static boolean elf_link_renumber_dynsyms
37 PARAMS ((struct elf_link_hash_entry
*, PTR
));
39 /* This struct is used to pass information to routines called via
40 elf_link_hash_traverse which must return failure. */
42 struct elf_info_failed
45 struct bfd_link_info
*info
;
48 /* Given an ELF BFD, add symbols to the global hash table as
52 elf_bfd_link_add_symbols (abfd
, info
)
54 struct bfd_link_info
*info
;
56 switch (bfd_get_format (abfd
))
59 return elf_link_add_object_symbols (abfd
, info
);
61 return elf_link_add_archive_symbols (abfd
, info
);
63 bfd_set_error (bfd_error_wrong_format
);
69 /* Add symbols from an ELF archive file to the linker hash table. We
70 don't use _bfd_generic_link_add_archive_symbols because of a
71 problem which arises on UnixWare. The UnixWare libc.so is an
72 archive which includes an entry libc.so.1 which defines a bunch of
73 symbols. The libc.so archive also includes a number of other
74 object files, which also define symbols, some of which are the same
75 as those defined in libc.so.1. Correct linking requires that we
76 consider each object file in turn, and include it if it defines any
77 symbols we need. _bfd_generic_link_add_archive_symbols does not do
78 this; it looks through the list of undefined symbols, and includes
79 any object file which defines them. When this algorithm is used on
80 UnixWare, it winds up pulling in libc.so.1 early and defining a
81 bunch of symbols. This means that some of the other objects in the
82 archive are not included in the link, which is incorrect since they
83 precede libc.so.1 in the archive.
85 Fortunately, ELF archive handling is simpler than that done by
86 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
87 oddities. In ELF, if we find a symbol in the archive map, and the
88 symbol is currently undefined, we know that we must pull in that
91 Unfortunately, we do have to make multiple passes over the symbol
92 table until nothing further is resolved. */
95 elf_link_add_archive_symbols (abfd
, info
)
97 struct bfd_link_info
*info
;
100 boolean
*defined
= NULL
;
101 boolean
*included
= NULL
;
105 if (! bfd_has_map (abfd
))
107 /* An empty archive is a special case. */
108 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
110 bfd_set_error (bfd_error_no_armap
);
114 /* Keep track of all symbols we know to be already defined, and all
115 files we know to be already included. This is to speed up the
116 second and subsequent passes. */
117 c
= bfd_ardata (abfd
)->symdef_count
;
120 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
121 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
122 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
124 memset (defined
, 0, c
* sizeof (boolean
));
125 memset (included
, 0, c
* sizeof (boolean
));
127 symdefs
= bfd_ardata (abfd
)->symdefs
;
140 symdefend
= symdef
+ c
;
141 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
143 struct elf_link_hash_entry
*h
;
145 struct bfd_link_hash_entry
*undefs_tail
;
148 if (defined
[i
] || included
[i
])
150 if (symdef
->file_offset
== last
)
156 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
157 false, false, false);
163 /* If this is a default version (the name contains @@),
164 look up the symbol again without the version. The
165 effect is that references to the symbol without the
166 version will be matched by the default symbol in the
169 p
= strchr (symdef
->name
, ELF_VER_CHR
);
170 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
173 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
176 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
177 copy
[p
- symdef
->name
] = '\0';
179 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
180 false, false, false);
182 bfd_release (abfd
, copy
);
188 if (h
->root
.type
!= bfd_link_hash_undefined
)
190 if (h
->root
.type
!= bfd_link_hash_undefweak
)
195 /* We need to include this archive member. */
197 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
198 if (element
== (bfd
*) NULL
)
201 if (! bfd_check_format (element
, bfd_object
))
204 /* Doublecheck that we have not included this object
205 already--it should be impossible, but there may be
206 something wrong with the archive. */
207 if (element
->archive_pass
!= 0)
209 bfd_set_error (bfd_error_bad_value
);
212 element
->archive_pass
= 1;
214 undefs_tail
= info
->hash
->undefs_tail
;
216 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
219 if (! elf_link_add_object_symbols (element
, info
))
222 /* If there are any new undefined symbols, we need to make
223 another pass through the archive in order to see whether
224 they can be defined. FIXME: This isn't perfect, because
225 common symbols wind up on undefs_tail and because an
226 undefined symbol which is defined later on in this pass
227 does not require another pass. This isn't a bug, but it
228 does make the code less efficient than it could be. */
229 if (undefs_tail
!= info
->hash
->undefs_tail
)
232 /* Look backward to mark all symbols from this object file
233 which we have already seen in this pass. */
237 included
[mark
] = true;
242 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
244 /* We mark subsequent symbols from this object file as we go
245 on through the loop. */
246 last
= symdef
->file_offset
;
257 if (defined
!= (boolean
*) NULL
)
259 if (included
!= (boolean
*) NULL
)
264 /* Add symbols from an ELF object file to the linker hash table. */
267 elf_link_add_object_symbols (abfd
, info
)
269 struct bfd_link_info
*info
;
271 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
272 const Elf_Internal_Sym
*,
273 const char **, flagword
*,
274 asection
**, bfd_vma
*));
275 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
276 asection
*, const Elf_Internal_Rela
*));
278 Elf_Internal_Shdr
*hdr
;
282 Elf_External_Sym
*buf
= NULL
;
283 struct elf_link_hash_entry
**sym_hash
;
285 bfd_byte
*dynver
= NULL
;
286 Elf_External_Versym
*extversym
= NULL
;
287 Elf_External_Versym
*ever
;
288 Elf_External_Dyn
*dynbuf
= NULL
;
289 struct elf_link_hash_entry
*weaks
;
290 Elf_External_Sym
*esym
;
291 Elf_External_Sym
*esymend
;
293 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
294 collect
= get_elf_backend_data (abfd
)->collect
;
296 if ((abfd
->flags
& DYNAMIC
) == 0)
302 /* You can't use -r against a dynamic object. Also, there's no
303 hope of using a dynamic object which does not exactly match
304 the format of the output file. */
305 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
307 bfd_set_error (bfd_error_invalid_operation
);
312 /* As a GNU extension, any input sections which are named
313 .gnu.warning.SYMBOL are treated as warning symbols for the given
314 symbol. This differs from .gnu.warning sections, which generate
315 warnings when they are included in an output file. */
320 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
324 name
= bfd_get_section_name (abfd
, s
);
325 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
330 name
+= sizeof ".gnu.warning." - 1;
332 /* If this is a shared object, then look up the symbol
333 in the hash table. If it is there, and it is already
334 been defined, then we will not be using the entry
335 from this shared object, so we don't need to warn.
336 FIXME: If we see the definition in a regular object
337 later on, we will warn, but we shouldn't. The only
338 fix is to keep track of what warnings we are supposed
339 to emit, and then handle them all at the end of the
341 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
343 struct elf_link_hash_entry
*h
;
345 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
348 /* FIXME: What about bfd_link_hash_common? */
350 && (h
->root
.type
== bfd_link_hash_defined
351 || h
->root
.type
== bfd_link_hash_defweak
))
353 /* We don't want to issue this warning. Clobber
354 the section size so that the warning does not
355 get copied into the output file. */
361 sz
= bfd_section_size (abfd
, s
);
362 msg
= (char *) bfd_alloc (abfd
, sz
);
366 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
369 if (! (_bfd_generic_link_add_one_symbol
370 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
371 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
374 if (! info
->relocateable
)
376 /* Clobber the section size so that the warning does
377 not get copied into the output file. */
384 /* If this is a dynamic object, we always link against the .dynsym
385 symbol table, not the .symtab symbol table. The dynamic linker
386 will only see the .dynsym symbol table, so there is no reason to
387 look at .symtab for a dynamic object. */
389 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
390 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
392 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
396 /* Read in any version definitions. */
398 if (! _bfd_elf_slurp_version_tables (abfd
))
401 /* Read in the symbol versions, but don't bother to convert them
402 to internal format. */
403 if (elf_dynversym (abfd
) != 0)
405 Elf_Internal_Shdr
*versymhdr
;
407 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
408 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
409 if (extversym
== NULL
)
411 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
412 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
413 != versymhdr
->sh_size
))
418 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
420 /* The sh_info field of the symtab header tells us where the
421 external symbols start. We don't care about the local symbols at
423 if (elf_bad_symtab (abfd
))
425 extsymcount
= symcount
;
430 extsymcount
= symcount
- hdr
->sh_info
;
431 extsymoff
= hdr
->sh_info
;
434 buf
= ((Elf_External_Sym
*)
435 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
436 if (buf
== NULL
&& extsymcount
!= 0)
439 /* We store a pointer to the hash table entry for each external
441 sym_hash
= ((struct elf_link_hash_entry
**)
443 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
444 if (sym_hash
== NULL
)
446 elf_sym_hashes (abfd
) = sym_hash
;
450 /* If we are creating a shared library, create all the dynamic
451 sections immediately. We need to attach them to something,
452 so we attach them to this BFD, provided it is the right
453 format. FIXME: If there are no input BFD's of the same
454 format as the output, we can't make a shared library. */
456 && ! elf_hash_table (info
)->dynamic_sections_created
457 && abfd
->xvec
== info
->hash
->creator
)
459 if (! elf_link_create_dynamic_sections (abfd
, info
))
468 bfd_size_type oldsize
;
469 bfd_size_type strindex
;
471 /* Find the name to use in a DT_NEEDED entry that refers to this
472 object. If the object has a DT_SONAME entry, we use it.
473 Otherwise, if the generic linker stuck something in
474 elf_dt_name, we use that. Otherwise, we just use the file
475 name. If the generic linker put a null string into
476 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
477 there is a DT_SONAME entry. */
479 name
= bfd_get_filename (abfd
);
480 if (elf_dt_name (abfd
) != NULL
)
482 name
= elf_dt_name (abfd
);
486 s
= bfd_get_section_by_name (abfd
, ".dynamic");
489 Elf_External_Dyn
*extdyn
;
490 Elf_External_Dyn
*extdynend
;
494 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
498 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
499 (file_ptr
) 0, s
->_raw_size
))
502 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
505 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
508 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
509 for (; extdyn
< extdynend
; extdyn
++)
511 Elf_Internal_Dyn dyn
;
513 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
514 if (dyn
.d_tag
== DT_SONAME
)
516 name
= bfd_elf_string_from_elf_section (abfd
, link
,
521 if (dyn
.d_tag
== DT_NEEDED
)
523 struct bfd_link_needed_list
*n
, **pn
;
526 n
= ((struct bfd_link_needed_list
*)
527 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
528 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
530 if (n
== NULL
|| fnm
== NULL
)
532 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
539 for (pn
= &elf_hash_table (info
)->needed
;
551 /* We do not want to include any of the sections in a dynamic
552 object in the output file. We hack by simply clobbering the
553 list of sections in the BFD. This could be handled more
554 cleanly by, say, a new section flag; the existing
555 SEC_NEVER_LOAD flag is not the one we want, because that one
556 still implies that the section takes up space in the output
558 abfd
->sections
= NULL
;
559 abfd
->section_count
= 0;
561 /* If this is the first dynamic object found in the link, create
562 the special sections required for dynamic linking. */
563 if (! elf_hash_table (info
)->dynamic_sections_created
)
565 if (! elf_link_create_dynamic_sections (abfd
, info
))
571 /* Add a DT_NEEDED entry for this dynamic object. */
572 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
573 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
575 if (strindex
== (bfd_size_type
) -1)
578 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
581 Elf_External_Dyn
*dyncon
, *dynconend
;
583 /* The hash table size did not change, which means that
584 the dynamic object name was already entered. If we
585 have already included this dynamic object in the
586 link, just ignore it. There is no reason to include
587 a particular dynamic object more than once. */
588 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
590 BFD_ASSERT (sdyn
!= NULL
);
592 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
593 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
595 for (; dyncon
< dynconend
; dyncon
++)
597 Elf_Internal_Dyn dyn
;
599 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
601 if (dyn
.d_tag
== DT_NEEDED
602 && dyn
.d_un
.d_val
== strindex
)
606 if (extversym
!= NULL
)
613 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
617 /* Save the SONAME, if there is one, because sometimes the
618 linker emulation code will need to know it. */
620 name
= bfd_get_filename (abfd
);
621 elf_dt_name (abfd
) = name
;
625 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
627 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
628 != extsymcount
* sizeof (Elf_External_Sym
)))
633 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
634 esymend
= buf
+ extsymcount
;
637 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
639 Elf_Internal_Sym sym
;
645 struct elf_link_hash_entry
*h
;
647 boolean size_change_ok
, type_change_ok
;
649 unsigned int old_alignment
;
651 elf_swap_symbol_in (abfd
, esym
, &sym
);
653 flags
= BSF_NO_FLAGS
;
655 value
= sym
.st_value
;
658 bind
= ELF_ST_BIND (sym
.st_info
);
659 if (bind
== STB_LOCAL
)
661 /* This should be impossible, since ELF requires that all
662 global symbols follow all local symbols, and that sh_info
663 point to the first global symbol. Unfortunatealy, Irix 5
667 else if (bind
== STB_GLOBAL
)
669 if (sym
.st_shndx
!= SHN_UNDEF
670 && sym
.st_shndx
!= SHN_COMMON
)
675 else if (bind
== STB_WEAK
)
679 /* Leave it up to the processor backend. */
682 if (sym
.st_shndx
== SHN_UNDEF
)
683 sec
= bfd_und_section_ptr
;
684 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
686 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
688 sec
= bfd_abs_section_ptr
;
689 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
692 else if (sym
.st_shndx
== SHN_ABS
)
693 sec
= bfd_abs_section_ptr
;
694 else if (sym
.st_shndx
== SHN_COMMON
)
696 sec
= bfd_com_section_ptr
;
697 /* What ELF calls the size we call the value. What ELF
698 calls the value we call the alignment. */
703 /* Leave it up to the processor backend. */
706 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
707 if (name
== (const char *) NULL
)
712 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
716 /* The hook function sets the name to NULL if this symbol
717 should be skipped for some reason. */
718 if (name
== (const char *) NULL
)
722 /* Sanity check that all possibilities were handled. */
723 if (sec
== (asection
*) NULL
)
725 bfd_set_error (bfd_error_bad_value
);
729 if (bfd_is_und_section (sec
)
730 || bfd_is_com_section (sec
))
735 size_change_ok
= false;
736 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
738 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
740 Elf_Internal_Versym iver
;
746 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
747 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
749 /* If this is a hidden symbol, or if it is not version
750 1, we append the version name to the symbol name.
751 However, we do not modify a non-hidden absolute
752 symbol, because it might be the version symbol
753 itself. FIXME: What if it isn't? */
754 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
755 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
761 if (sym
.st_shndx
!= SHN_UNDEF
)
763 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
765 (*_bfd_error_handler
)
766 ("%s: %s: invalid version %d (max %d)",
767 abfd
->filename
, name
, vernum
,
768 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
769 bfd_set_error (bfd_error_bad_value
);
774 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
780 /* We cannot simply test for the number of
781 entries in the VERNEED section since the
782 numbers for the needed versions do not start
784 Elf_Internal_Verneed
*t
;
787 for (t
= elf_tdata (abfd
)->verref
;
791 Elf_Internal_Vernaux
*a
;
793 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
795 if (a
->vna_other
== vernum
)
797 verstr
= a
->vna_nodename
;
806 (*_bfd_error_handler
)
807 ("%s: %s: invalid needed version %d",
808 abfd
->filename
, name
, vernum
);
809 bfd_set_error (bfd_error_bad_value
);
814 namelen
= strlen (name
);
815 newlen
= namelen
+ strlen (verstr
) + 2;
816 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
819 newname
= (char *) bfd_alloc (abfd
, newlen
);
822 strcpy (newname
, name
);
823 p
= newname
+ namelen
;
825 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
833 /* We need to look up the symbol now in order to get some of
834 the dynamic object handling right. We pass the hash
835 table entry in to _bfd_generic_link_add_one_symbol so
836 that it does not have to look it up again. */
837 if (! bfd_is_und_section (sec
))
838 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
841 h
= ((struct elf_link_hash_entry
*)
842 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true,
848 if (h
->root
.type
== bfd_link_hash_new
)
849 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
851 while (h
->root
.type
== bfd_link_hash_indirect
852 || h
->root
.type
== bfd_link_hash_warning
)
853 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
855 /* FIXME: There are too many cases here, and it's too
856 confusing. This code needs to be reorganized somehow. */
858 /* It's OK to change the type if it used to be a weak
859 definition, or if the current definition is weak (and
860 hence might be ignored). */
861 if (h
->root
.type
== bfd_link_hash_defweak
862 || h
->root
.type
== bfd_link_hash_undefweak
864 type_change_ok
= true;
866 /* It's OK to change the size if it used to be a weak
867 definition, or if it used to be undefined, or if we will
868 be overriding an old definition. */
870 || h
->root
.type
== bfd_link_hash_undefined
)
871 size_change_ok
= true;
873 if (h
->root
.type
== bfd_link_hash_common
)
874 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
878 /* If we are looking at a dynamic object, and this is a
879 definition, we need to see if it has already been defined
880 by some other object. If it has, we want to use the
881 existing definition, and we do not want to report a
882 multiple symbol definition error; we do this by
883 clobbering sec to be bfd_und_section_ptr. We treat a
884 common symbol as a definition if the symbol in the shared
885 library is a function, since common symbols always
886 represent variables; this can cause confusion in
887 principle, but any such confusion would seem to indicate
888 an erroneous program or shared library. */
889 if (dynamic
&& definition
)
891 if (h
->root
.type
== bfd_link_hash_defined
892 || h
->root
.type
== bfd_link_hash_defweak
893 || (h
->root
.type
== bfd_link_hash_common
895 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
)))
897 /* In the special case of two symbols which look
898 like common symbols in a dynamic object, set the
899 size of the symbol to the larger of the two. */
900 if ((sec
->flags
& SEC_ALLOC
) != 0
901 && (sec
->flags
& SEC_LOAD
) == 0
904 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
905 && h
->root
.type
== bfd_link_hash_defined
906 && (h
->elf_link_hash_flags
907 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
908 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) != 0
909 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
910 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
912 && h
->type
!= STT_FUNC
913 && sym
.st_size
!= h
->size
)
915 /* Note that we only warn if the size is
916 different. If the size is the same, then we
917 simply let the first shared library override
919 if (! ((*info
->callbacks
->multiple_common
)
920 (info
, h
->root
.root
.string
,
921 h
->root
.u
.def
.section
->owner
,
922 bfd_link_hash_common
,
923 h
->size
, abfd
, bfd_link_hash_common
,
926 if (sym
.st_size
> h
->size
)
927 h
->size
= sym
.st_size
;
931 sec
= bfd_und_section_ptr
;
933 size_change_ok
= true;
934 if (h
->root
.type
== bfd_link_hash_common
)
935 type_change_ok
= true;
939 /* If we already have a common symbol, and the symbol in the
940 shared library is in an uninitialized section, then treat
941 the shared library symbol as a common symbol. This will
942 not always be correct, but it should do little harm. */
945 && h
->root
.type
== bfd_link_hash_common
946 && (sec
->flags
& SEC_ALLOC
) != 0
947 && (sec
->flags
& SEC_LOAD
) == 0
950 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
)
953 sec
= bfd_com_section_ptr
;
956 size_change_ok
= true;
959 /* If we are not looking at a dynamic object, and we have a
960 definition, we want to override any definition we may
961 have from a dynamic object. Symbols from regular files
962 always take precedence over symbols from dynamic objects,
963 even if they are defined after the dynamic object in the
967 || (bfd_is_com_section (sec
)
968 && (h
->root
.type
== bfd_link_hash_defweak
969 || h
->type
== STT_FUNC
)))
970 && (h
->root
.type
== bfd_link_hash_defined
971 || h
->root
.type
== bfd_link_hash_defweak
)
972 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
973 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) != 0)
976 /* Change the hash table entry to undefined, and let
977 _bfd_generic_link_add_one_symbol do the right thing
978 with the new definition. */
979 h
->root
.type
= bfd_link_hash_undefined
;
980 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
981 size_change_ok
= true;
982 if (bfd_is_com_section (sec
))
983 type_change_ok
= true;
985 /* This union may have been set to be non-NULL when this
986 symbol was seen in a dynamic object. We must force
987 the union to be NULL, so that it is correct for a
989 h
->verinfo
.vertree
= NULL
;
992 /* If we are not looking at a shared library and we have a
993 common symbol, and the symbol in the shared library is in
994 an uninitialized section, then treat the shared library
995 symbol as a common symbol. This will not always be
996 correct, but it should do little harm. Note that the
997 above condition already handled cases in which a common
998 symbol should simply override the definition in the
1002 && bfd_is_com_section (sec
)
1003 && h
->root
.type
== bfd_link_hash_defined
1004 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1005 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) != 0
1006 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1007 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1009 && h
->type
!= STT_FUNC
)
1011 /* It would be best if we could set the hash table entry
1012 to a common symbol, but we don't know what to use for
1013 the section or the alignment. */
1014 if (! ((*info
->callbacks
->multiple_common
)
1015 (info
, h
->root
.root
.string
,
1016 h
->root
.u
.def
.section
->owner
, bfd_link_hash_common
,
1017 h
->size
, abfd
, bfd_link_hash_common
, value
)))
1020 if (h
->size
> value
)
1023 /* FIXME: We no longer know the alignment required by
1024 the symbol in the shared library, so we just wind up
1025 using the one from the regular object. */
1028 h
->root
.type
= bfd_link_hash_undefined
;
1029 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1030 size_change_ok
= true;
1031 type_change_ok
= true;
1032 h
->verinfo
.vertree
= NULL
;
1038 && (h
->verinfo
.verdef
== NULL
|| definition
))
1039 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1042 if (! (_bfd_generic_link_add_one_symbol
1043 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1044 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1048 while (h
->root
.type
== bfd_link_hash_indirect
1049 || h
->root
.type
== bfd_link_hash_warning
)
1050 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1053 new_weakdef
= false;
1056 && (flags
& BSF_WEAK
) != 0
1057 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1058 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1059 && h
->weakdef
== NULL
)
1061 /* Keep a list of all weak defined non function symbols from
1062 a dynamic object, using the weakdef field. Later in this
1063 function we will set the weakdef field to the correct
1064 value. We only put non-function symbols from dynamic
1065 objects on this list, because that happens to be the only
1066 time we need to know the normal symbol corresponding to a
1067 weak symbol, and the information is time consuming to
1068 figure out. If the weakdef field is not already NULL,
1069 then this symbol was already defined by some previous
1070 dynamic object, and we will be using that previous
1071 definition anyhow. */
1078 /* Set the alignment of a common symbol. */
1079 if (sym
.st_shndx
== SHN_COMMON
1080 && h
->root
.type
== bfd_link_hash_common
)
1084 align
= bfd_log2 (sym
.st_value
);
1085 if (align
> old_alignment
)
1086 h
->root
.u
.c
.p
->alignment_power
= align
;
1089 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1095 /* Remember the symbol size and type. */
1096 if (sym
.st_size
!= 0
1097 && (definition
|| h
->size
== 0))
1099 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1100 (*_bfd_error_handler
)
1101 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
1102 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1103 bfd_get_filename (abfd
));
1105 h
->size
= sym
.st_size
;
1108 /* If this is a common symbol, then we always want H->SIZE
1109 to be the size of the common symbol. The code just above
1110 won't fix the size if a common symbol becomes larger. We
1111 don't warn about a size change here, because that is
1112 covered by --warn-common. */
1113 if (h
->root
.type
== bfd_link_hash_common
)
1114 h
->size
= h
->root
.u
.c
.size
;
1116 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1117 && (definition
|| h
->type
== STT_NOTYPE
))
1119 if (h
->type
!= STT_NOTYPE
1120 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1121 && ! type_change_ok
)
1122 (*_bfd_error_handler
)
1123 ("Warning: type of symbol `%s' changed from %d to %d in %s",
1124 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1125 bfd_get_filename (abfd
));
1127 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1130 if (sym
.st_other
!= 0
1131 && (definition
|| h
->other
== 0))
1132 h
->other
= sym
.st_other
;
1134 /* Set a flag in the hash table entry indicating the type of
1135 reference or definition we just found. Keep a count of
1136 the number of dynamic symbols we find. A dynamic symbol
1137 is one which is referenced or defined by both a regular
1138 object and a shared object. */
1139 old_flags
= h
->elf_link_hash_flags
;
1144 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1146 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1148 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1149 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1155 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1157 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1158 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1159 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1160 || (h
->weakdef
!= NULL
1162 && h
->weakdef
->dynindx
!= -1))
1166 h
->elf_link_hash_flags
|= new_flag
;
1168 /* If this symbol has a version, and it is the default
1169 version, we create an indirect symbol from the default
1170 name to the fully decorated name. This will cause
1171 external references which do not specify a version to be
1172 bound to this version of the symbol. */
1177 p
= strchr (name
, ELF_VER_CHR
);
1178 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1181 struct elf_link_hash_entry
*hold
;
1183 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1185 if (shortname
== NULL
)
1187 strncpy (shortname
, name
, p
- name
);
1188 shortname
[p
- name
] = '\0';
1190 /* First look to see if we have an existing symbol
1192 hold
= elf_link_hash_lookup (elf_hash_table (info
),
1193 shortname
, false, false,
1196 /* If we are looking at a normal object, and the
1197 symbol was seen in a shared object, clobber the
1198 definition in the shared object. */
1201 && (hold
->root
.type
== bfd_link_hash_defined
1202 || hold
->root
.type
== bfd_link_hash_defweak
)
1203 && (hold
->elf_link_hash_flags
1204 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1205 && ((hold
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
)
1208 /* Change the hash table entry to undefined, so
1209 that _bfd_generic_link_add_one_symbol will do
1211 hold
->root
.type
= bfd_link_hash_undefined
;
1212 hold
->root
.u
.undef
.abfd
=
1213 hold
->root
.u
.def
.section
->owner
;
1214 hold
->verinfo
.vertree
= NULL
;
1218 /* If we are looking at a shared object, and we have
1219 already seen this symbol defined elsewhere, then
1220 don't try to define it again. */
1223 && (hold
->root
.type
== bfd_link_hash_defined
1224 || hold
->root
.type
== bfd_link_hash_defweak
1225 || hold
->root
.type
== bfd_link_hash_indirect
1226 || (hold
->root
.type
== bfd_link_hash_common
1227 && (bind
== STB_WEAK
1228 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
))))
1230 /* Don't add an indirect symbol. */
1234 struct elf_link_hash_entry
*hi
;
1237 if (! (_bfd_generic_link_add_one_symbol
1238 (info
, abfd
, shortname
, BSF_INDIRECT
,
1239 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1240 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1243 /* If there is a duplicate definition somewhere,
1244 then HI may not point to an indirect symbol.
1245 We will have reported an error to the user in
1248 if (hi
->root
.type
== bfd_link_hash_indirect
)
1250 hi
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
1252 /* If the symbol became indirect, then we
1253 assume that we have not seen a definition
1255 BFD_ASSERT ((hi
->elf_link_hash_flags
1256 & (ELF_LINK_HASH_DEF_DYNAMIC
1257 | ELF_LINK_HASH_DEF_REGULAR
))
1260 /* Copy down any references that we may have
1261 already seen to the symbol which just
1263 h
->elf_link_hash_flags
|=
1264 (hi
->elf_link_hash_flags
1265 & (ELF_LINK_HASH_REF_DYNAMIC
1266 | ELF_LINK_HASH_REF_REGULAR
));
1268 /* Copy over the global table offset entry.
1269 This may have been already set up by a
1270 check_relocs routine. */
1271 if (h
->got_offset
== (bfd_vma
) -1)
1273 h
->got_offset
= hi
->got_offset
;
1274 hi
->got_offset
= (bfd_vma
) -1;
1276 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1278 if (h
->dynindx
== -1)
1280 h
->dynindx
= hi
->dynindx
;
1281 h
->dynstr_index
= hi
->dynstr_index
;
1283 hi
->dynstr_index
= 0;
1285 BFD_ASSERT (hi
->dynindx
== -1);
1287 /* FIXME: There may be other information to
1288 copy over for particular targets. */
1290 /* See if the new flags lead us to realize
1291 that the symbol must be dynamic. */
1297 || ((hi
->elf_link_hash_flags
1298 & ELF_LINK_HASH_REF_DYNAMIC
)
1304 if ((hi
->elf_link_hash_flags
1305 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1312 /* We also need to define an indirection from the
1313 nondefault version of the symbol. */
1315 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1317 if (shortname
== NULL
)
1319 strncpy (shortname
, name
, p
- name
);
1320 strcpy (shortname
+ (p
- name
), p
+ 1);
1322 /* First look to see if we have an existing symbol
1324 hold
= elf_link_hash_lookup (elf_hash_table (info
),
1325 shortname
, false, false,
1328 /* If we are looking at a normal object, and the
1329 symbol was seen in a shared object, clobber the
1330 definition in the shared object. */
1333 && (hold
->root
.type
== bfd_link_hash_defined
1334 || hold
->root
.type
== bfd_link_hash_defweak
)
1335 && (hold
->elf_link_hash_flags
1336 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1337 && ((hold
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
)
1340 /* Change the hash table entry to undefined, so
1341 that _bfd_generic_link_add_one_symbol will do
1343 hold
->root
.type
= bfd_link_hash_undefined
;
1344 hold
->root
.u
.undef
.abfd
=
1345 hold
->root
.u
.def
.section
->owner
;
1346 hold
->verinfo
.vertree
= NULL
;
1350 /* If we are looking at a shared object, and we have
1351 already seen this symbol defined elsewhere, then
1352 don't try to define it again. */
1355 && (hold
->root
.type
== bfd_link_hash_defined
1356 || hold
->root
.type
== bfd_link_hash_defweak
1357 || hold
->root
.type
== bfd_link_hash_indirect
1358 || (hold
->root
.type
== bfd_link_hash_common
1359 && (bind
== STB_WEAK
1360 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
))))
1362 /* Don't add an indirect symbol. */
1366 struct elf_link_hash_entry
*hi
;
1369 if (! (_bfd_generic_link_add_one_symbol
1370 (info
, abfd
, shortname
, BSF_INDIRECT
,
1371 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1372 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1375 /* If there is a duplicate definition somewhere,
1376 then HI may not point to an indirect symbol.
1377 We will have reported an error to the user in
1380 if (hi
->root
.type
== bfd_link_hash_indirect
)
1382 hi
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
1384 /* If the symbol became indirect, then we
1385 assume that we have not seen a definition
1387 BFD_ASSERT ((hi
->elf_link_hash_flags
1388 & (ELF_LINK_HASH_DEF_DYNAMIC
1389 | ELF_LINK_HASH_DEF_REGULAR
))
1392 /* Copy down any references that we may have
1393 already seen to the symbol which just
1395 h
->elf_link_hash_flags
|=
1396 (hi
->elf_link_hash_flags
1397 & (ELF_LINK_HASH_REF_DYNAMIC
1398 | ELF_LINK_HASH_REF_REGULAR
));
1400 /* Copy over the global table offset entry.
1401 This may have been already set up by a
1402 check_relocs routine. */
1403 if (h
->got_offset
== (bfd_vma
) -1)
1405 h
->got_offset
= hi
->got_offset
;
1406 hi
->got_offset
= (bfd_vma
) -1;
1408 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1410 if (h
->dynindx
== -1)
1412 h
->dynindx
= hi
->dynindx
;
1413 h
->dynstr_index
= hi
->dynstr_index
;
1415 hi
->dynstr_index
= 0;
1417 BFD_ASSERT (hi
->dynindx
== -1);
1419 /* FIXME: There may be other information to
1420 copy over for particular targets. */
1422 /* See if the new flags lead us to realize
1423 that the symbol must be dynamic. */
1429 || ((hi
->elf_link_hash_flags
1430 & ELF_LINK_HASH_REF_DYNAMIC
)
1436 if ((hi
->elf_link_hash_flags
1437 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1446 if (dynsym
&& h
->dynindx
== -1)
1448 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1450 if (h
->weakdef
!= NULL
1452 && h
->weakdef
->dynindx
== -1)
1454 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1462 /* Now set the weakdefs field correctly for all the weak defined
1463 symbols we found. The only way to do this is to search all the
1464 symbols. Since we only need the information for non functions in
1465 dynamic objects, that's the only time we actually put anything on
1466 the list WEAKS. We need this information so that if a regular
1467 object refers to a symbol defined weakly in a dynamic object, the
1468 real symbol in the dynamic object is also put in the dynamic
1469 symbols; we also must arrange for both symbols to point to the
1470 same memory location. We could handle the general case of symbol
1471 aliasing, but a general symbol alias can only be generated in
1472 assembler code, handling it correctly would be very time
1473 consuming, and other ELF linkers don't handle general aliasing
1475 while (weaks
!= NULL
)
1477 struct elf_link_hash_entry
*hlook
;
1480 struct elf_link_hash_entry
**hpp
;
1481 struct elf_link_hash_entry
**hppend
;
1484 weaks
= hlook
->weakdef
;
1485 hlook
->weakdef
= NULL
;
1487 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1488 || hlook
->root
.type
== bfd_link_hash_defweak
1489 || hlook
->root
.type
== bfd_link_hash_common
1490 || hlook
->root
.type
== bfd_link_hash_indirect
);
1491 slook
= hlook
->root
.u
.def
.section
;
1492 vlook
= hlook
->root
.u
.def
.value
;
1494 hpp
= elf_sym_hashes (abfd
);
1495 hppend
= hpp
+ extsymcount
;
1496 for (; hpp
< hppend
; hpp
++)
1498 struct elf_link_hash_entry
*h
;
1501 if (h
!= NULL
&& h
!= hlook
1502 && h
->root
.type
== bfd_link_hash_defined
1503 && h
->root
.u
.def
.section
== slook
1504 && h
->root
.u
.def
.value
== vlook
)
1508 /* If the weak definition is in the list of dynamic
1509 symbols, make sure the real definition is put there
1511 if (hlook
->dynindx
!= -1
1512 && h
->dynindx
== -1)
1514 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1518 /* If the real definition is in the list of dynamic
1519 symbols, make sure the weak definition is put there
1520 as well. If we don't do this, then the dynamic
1521 loader might not merge the entries for the real
1522 definition and the weak definition. */
1523 if (h
->dynindx
!= -1
1524 && hlook
->dynindx
== -1)
1526 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1541 if (extversym
!= NULL
)
1547 /* If this object is the same format as the output object, and it is
1548 not a shared library, then let the backend look through the
1551 This is required to build global offset table entries and to
1552 arrange for dynamic relocs. It is not required for the
1553 particular common case of linking non PIC code, even when linking
1554 against shared libraries, but unfortunately there is no way of
1555 knowing whether an object file has been compiled PIC or not.
1556 Looking through the relocs is not particularly time consuming.
1557 The problem is that we must either (1) keep the relocs in memory,
1558 which causes the linker to require additional runtime memory or
1559 (2) read the relocs twice from the input file, which wastes time.
1560 This would be a good case for using mmap.
1562 I have no idea how to handle linking PIC code into a file of a
1563 different format. It probably can't be done. */
1564 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1566 && abfd
->xvec
== info
->hash
->creator
1567 && check_relocs
!= NULL
)
1571 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1573 Elf_Internal_Rela
*internal_relocs
;
1576 if ((o
->flags
& SEC_RELOC
) == 0
1577 || o
->reloc_count
== 0
1578 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1579 && (o
->flags
& SEC_DEBUGGING
) != 0)
1580 || bfd_is_abs_section (o
->output_section
))
1583 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1584 (abfd
, o
, (PTR
) NULL
,
1585 (Elf_Internal_Rela
*) NULL
,
1586 info
->keep_memory
));
1587 if (internal_relocs
== NULL
)
1590 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1592 if (! info
->keep_memory
)
1593 free (internal_relocs
);
1600 /* If this is a non-traditional, non-relocateable link, try to
1601 optimize the handling of the .stab/.stabstr sections. */
1603 && ! info
->relocateable
1604 && ! info
->traditional_format
1605 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1606 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1608 asection
*stab
, *stabstr
;
1610 stab
= bfd_get_section_by_name (abfd
, ".stab");
1613 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1615 if (stabstr
!= NULL
)
1617 struct bfd_elf_section_data
*secdata
;
1619 secdata
= elf_section_data (stab
);
1620 if (! _bfd_link_section_stabs (abfd
,
1621 &elf_hash_table (info
)->stab_info
,
1623 &secdata
->stab_info
))
1638 if (extversym
!= NULL
)
1643 /* Create some sections which will be filled in with dynamic linking
1644 information. ABFD is an input file which requires dynamic sections
1645 to be created. The dynamic sections take up virtual memory space
1646 when the final executable is run, so we need to create them before
1647 addresses are assigned to the output sections. We work out the
1648 actual contents and size of these sections later. */
1651 elf_link_create_dynamic_sections (abfd
, info
)
1653 struct bfd_link_info
*info
;
1656 register asection
*s
;
1657 struct elf_link_hash_entry
*h
;
1658 struct elf_backend_data
*bed
;
1660 if (elf_hash_table (info
)->dynamic_sections_created
)
1663 /* Make sure that all dynamic sections use the same input BFD. */
1664 if (elf_hash_table (info
)->dynobj
== NULL
)
1665 elf_hash_table (info
)->dynobj
= abfd
;
1667 abfd
= elf_hash_table (info
)->dynobj
;
1669 /* Note that we set the SEC_IN_MEMORY flag for all of these
1671 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1672 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1674 /* A dynamically linked executable has a .interp section, but a
1675 shared library does not. */
1678 s
= bfd_make_section (abfd
, ".interp");
1680 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1684 /* Create sections to hold version informations. These are removed
1685 if they are not needed. */
1686 s
= bfd_make_section (abfd
, ".gnu.version_d");
1688 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1689 || ! bfd_set_section_alignment (abfd
, s
, 2))
1692 s
= bfd_make_section (abfd
, ".gnu.version");
1694 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1695 || ! bfd_set_section_alignment (abfd
, s
, 1))
1698 s
= bfd_make_section (abfd
, ".gnu.version_r");
1700 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1701 || ! bfd_set_section_alignment (abfd
, s
, 2))
1704 s
= bfd_make_section (abfd
, ".dynsym");
1706 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1707 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1710 s
= bfd_make_section (abfd
, ".dynstr");
1712 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1715 /* Create a strtab to hold the dynamic symbol names. */
1716 if (elf_hash_table (info
)->dynstr
== NULL
)
1718 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1719 if (elf_hash_table (info
)->dynstr
== NULL
)
1723 s
= bfd_make_section (abfd
, ".dynamic");
1725 || ! bfd_set_section_flags (abfd
, s
, flags
)
1726 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1729 /* The special symbol _DYNAMIC is always set to the start of the
1730 .dynamic section. This call occurs before we have processed the
1731 symbols for any dynamic object, so we don't have to worry about
1732 overriding a dynamic definition. We could set _DYNAMIC in a
1733 linker script, but we only want to define it if we are, in fact,
1734 creating a .dynamic section. We don't want to define it if there
1735 is no .dynamic section, since on some ELF platforms the start up
1736 code examines it to decide how to initialize the process. */
1738 if (! (_bfd_generic_link_add_one_symbol
1739 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1740 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1741 (struct bfd_link_hash_entry
**) &h
)))
1743 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1744 h
->type
= STT_OBJECT
;
1747 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1750 s
= bfd_make_section (abfd
, ".hash");
1752 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1753 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1756 /* Let the backend create the rest of the sections. This lets the
1757 backend set the right flags. The backend will normally create
1758 the .got and .plt sections. */
1759 bed
= get_elf_backend_data (abfd
);
1760 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1763 elf_hash_table (info
)->dynamic_sections_created
= true;
1768 /* Add an entry to the .dynamic table. */
1771 elf_add_dynamic_entry (info
, tag
, val
)
1772 struct bfd_link_info
*info
;
1776 Elf_Internal_Dyn dyn
;
1780 bfd_byte
*newcontents
;
1782 dynobj
= elf_hash_table (info
)->dynobj
;
1784 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1785 BFD_ASSERT (s
!= NULL
);
1787 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1788 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1789 if (newcontents
== NULL
)
1793 dyn
.d_un
.d_val
= val
;
1794 elf_swap_dyn_out (dynobj
, &dyn
,
1795 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1797 s
->_raw_size
= newsize
;
1798 s
->contents
= newcontents
;
1804 /* Read and swap the relocs for a section. They may have been cached.
1805 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1806 they are used as buffers to read into. They are known to be large
1807 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1808 value is allocated using either malloc or bfd_alloc, according to
1809 the KEEP_MEMORY argument. */
1812 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1816 PTR external_relocs
;
1817 Elf_Internal_Rela
*internal_relocs
;
1818 boolean keep_memory
;
1820 Elf_Internal_Shdr
*rel_hdr
;
1822 Elf_Internal_Rela
*alloc2
= NULL
;
1824 if (elf_section_data (o
)->relocs
!= NULL
)
1825 return elf_section_data (o
)->relocs
;
1827 if (o
->reloc_count
== 0)
1830 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1832 if (internal_relocs
== NULL
)
1836 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1838 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1840 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1841 if (internal_relocs
== NULL
)
1845 if (external_relocs
== NULL
)
1847 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
1850 external_relocs
= alloc1
;
1853 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
1854 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
1855 != rel_hdr
->sh_size
))
1858 /* Swap in the relocs. For convenience, we always produce an
1859 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1861 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
1863 Elf_External_Rel
*erel
;
1864 Elf_External_Rel
*erelend
;
1865 Elf_Internal_Rela
*irela
;
1867 erel
= (Elf_External_Rel
*) external_relocs
;
1868 erelend
= erel
+ o
->reloc_count
;
1869 irela
= internal_relocs
;
1870 for (; erel
< erelend
; erel
++, irela
++)
1872 Elf_Internal_Rel irel
;
1874 elf_swap_reloc_in (abfd
, erel
, &irel
);
1875 irela
->r_offset
= irel
.r_offset
;
1876 irela
->r_info
= irel
.r_info
;
1877 irela
->r_addend
= 0;
1882 Elf_External_Rela
*erela
;
1883 Elf_External_Rela
*erelaend
;
1884 Elf_Internal_Rela
*irela
;
1886 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
1888 erela
= (Elf_External_Rela
*) external_relocs
;
1889 erelaend
= erela
+ o
->reloc_count
;
1890 irela
= internal_relocs
;
1891 for (; erela
< erelaend
; erela
++, irela
++)
1892 elf_swap_reloca_in (abfd
, erela
, irela
);
1895 /* Cache the results for next time, if we can. */
1897 elf_section_data (o
)->relocs
= internal_relocs
;
1902 /* Don't free alloc2, since if it was allocated we are passing it
1903 back (under the name of internal_relocs). */
1905 return internal_relocs
;
1916 /* Record an assignment to a symbol made by a linker script. We need
1917 this in case some dynamic object refers to this symbol. */
1921 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
1923 struct bfd_link_info
*info
;
1927 struct elf_link_hash_entry
*h
;
1929 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1932 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
1936 if (h
->root
.type
== bfd_link_hash_new
)
1937 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
1939 /* If this symbol is being provided by the linker script, and it is
1940 currently defined by a dynamic object, but not by a regular
1941 object, then mark it as undefined so that the generic linker will
1942 force the correct value. */
1944 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1945 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1946 h
->root
.type
= bfd_link_hash_undefined
;
1948 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1949 h
->type
= STT_OBJECT
;
1951 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1952 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
1954 && h
->dynindx
== -1)
1956 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1959 /* If this is a weak defined symbol, and we know a corresponding
1960 real symbol from the same dynamic object, make sure the real
1961 symbol is also made into a dynamic symbol. */
1962 if (h
->weakdef
!= NULL
1963 && h
->weakdef
->dynindx
== -1)
1965 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
1973 /* This structure is used to pass information to
1974 elf_link_assign_sym_version. */
1976 struct elf_assign_sym_version_info
1980 /* General link information. */
1981 struct bfd_link_info
*info
;
1983 struct bfd_elf_version_tree
*verdefs
;
1984 /* Whether we are exporting all dynamic symbols. */
1985 boolean export_dynamic
;
1986 /* Whether we removed any symbols from the dynamic symbol table. */
1987 boolean removed_dynamic
;
1988 /* Whether we had a failure. */
1992 /* This structure is used to pass information to
1993 elf_link_find_version_dependencies. */
1995 struct elf_find_verdep_info
1999 /* General link information. */
2000 struct bfd_link_info
*info
;
2001 /* The number of dependencies. */
2003 /* Whether we had a failure. */
2007 /* Array used to determine the number of hash table buckets to use
2008 based on the number of symbols there are. If there are fewer than
2009 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2010 fewer than 37 we use 17 buckets, and so forth. We never use more
2011 than 32771 buckets. */
2013 static const size_t elf_buckets
[] =
2015 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2019 /* Set up the sizes and contents of the ELF dynamic sections. This is
2020 called by the ELF linker emulation before_allocation routine. We
2021 must set the sizes of the sections before the linker sets the
2022 addresses of the various sections. */
2025 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2026 export_dynamic
, filter_shlib
,
2027 auxiliary_filters
, info
, sinterpptr
,
2032 boolean export_dynamic
;
2033 const char *filter_shlib
;
2034 const char * const *auxiliary_filters
;
2035 struct bfd_link_info
*info
;
2036 asection
**sinterpptr
;
2037 struct bfd_elf_version_tree
*verdefs
;
2039 bfd_size_type soname_indx
;
2041 struct elf_backend_data
*bed
;
2042 bfd_size_type old_dynsymcount
;
2048 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2051 /* The backend may have to create some sections regardless of whether
2052 we're dynamic or not. */
2053 bed
= get_elf_backend_data (output_bfd
);
2054 if (bed
->elf_backend_always_size_sections
2055 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2058 dynobj
= elf_hash_table (info
)->dynobj
;
2060 /* If there were no dynamic objects in the link, there is nothing to
2065 /* If we are supposed to export all symbols into the dynamic symbol
2066 table (this is not the normal case), then do so. */
2069 struct elf_info_failed eif
;
2073 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2079 if (elf_hash_table (info
)->dynamic_sections_created
)
2081 struct elf_info_failed eif
;
2082 struct elf_link_hash_entry
*h
;
2083 bfd_size_type strsize
;
2085 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2086 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2090 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2091 soname
, true, true);
2092 if (soname_indx
== (bfd_size_type
) -1
2093 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2099 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2107 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2109 if (indx
== (bfd_size_type
) -1
2110 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2114 if (filter_shlib
!= NULL
)
2118 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2119 filter_shlib
, true, true);
2120 if (indx
== (bfd_size_type
) -1
2121 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2125 if (auxiliary_filters
!= NULL
)
2127 const char * const *p
;
2129 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2133 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2135 if (indx
== (bfd_size_type
) -1
2136 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2141 /* Find all symbols which were defined in a dynamic object and make
2142 the backend pick a reasonable value for them. */
2145 elf_link_hash_traverse (elf_hash_table (info
),
2146 elf_adjust_dynamic_symbol
,
2151 /* Add some entries to the .dynamic section. We fill in some of the
2152 values later, in elf_bfd_final_link, but we must add the entries
2153 now so that we know the final size of the .dynamic section. */
2154 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2157 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2158 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2160 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2163 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2166 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2167 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2169 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2172 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2173 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2174 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2175 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2176 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2177 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2178 sizeof (Elf_External_Sym
)))
2182 /* The backend must work out the sizes of all the other dynamic
2184 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2185 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2188 if (elf_hash_table (info
)->dynamic_sections_created
)
2193 size_t bucketcount
= 0;
2194 Elf_Internal_Sym isym
;
2195 struct elf_assign_sym_version_info sinfo
;
2197 /* Set up the version definition section. */
2198 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2199 BFD_ASSERT (s
!= NULL
);
2201 /* Attach all the symbols to their version information. This
2202 may cause some symbols to be unexported. */
2203 sinfo
.output_bfd
= output_bfd
;
2205 sinfo
.verdefs
= verdefs
;
2206 sinfo
.export_dynamic
= export_dynamic
;
2207 sinfo
.removed_dynamic
= false;
2208 sinfo
.failed
= false;
2210 elf_link_hash_traverse (elf_hash_table (info
),
2211 elf_link_assign_sym_version
,
2216 /* We may have created additional version definitions if we are
2217 just linking a regular application. */
2218 verdefs
= sinfo
.verdefs
;
2220 if (verdefs
== NULL
)
2224 /* Don't include this section in the output file. */
2225 for (spp
= &output_bfd
->sections
;
2226 *spp
!= s
->output_section
;
2227 spp
= &(*spp
)->next
)
2229 *spp
= s
->output_section
->next
;
2230 --output_bfd
->section_count
;
2236 struct bfd_elf_version_tree
*t
;
2238 Elf_Internal_Verdef def
;
2239 Elf_Internal_Verdaux defaux
;
2241 if (sinfo
.removed_dynamic
)
2243 /* Some dynamic symbols were changed to be local
2244 symbols. In this case, we renumber all of the
2245 dynamic symbols, so that we don't have a hole. If
2246 the backend changed dynsymcount, then assume that the
2247 new symbols are at the start. This is the case on
2248 the MIPS. FIXME: The names of the removed symbols
2249 will still be in the dynamic string table, wasting
2251 elf_hash_table (info
)->dynsymcount
=
2252 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2253 elf_link_hash_traverse (elf_hash_table (info
),
2254 elf_link_renumber_dynsyms
,
2261 /* Make space for the base version. */
2262 size
+= sizeof (Elf_External_Verdef
);
2263 size
+= sizeof (Elf_External_Verdaux
);
2266 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2268 struct bfd_elf_version_deps
*n
;
2270 size
+= sizeof (Elf_External_Verdef
);
2271 size
+= sizeof (Elf_External_Verdaux
);
2274 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2275 size
+= sizeof (Elf_External_Verdaux
);
2278 s
->_raw_size
= size
;
2279 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2280 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2283 /* Fill in the version definition section. */
2287 def
.vd_version
= VER_DEF_CURRENT
;
2288 def
.vd_flags
= VER_FLG_BASE
;
2291 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2292 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2293 + sizeof (Elf_External_Verdaux
));
2295 if (soname_indx
!= -1)
2297 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2298 defaux
.vda_name
= soname_indx
;
2305 name
= output_bfd
->filename
;
2306 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2307 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2309 if (indx
== (bfd_size_type
) -1)
2311 defaux
.vda_name
= indx
;
2313 defaux
.vda_next
= 0;
2315 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2316 (Elf_External_Verdef
*)p
);
2317 p
+= sizeof (Elf_External_Verdef
);
2318 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2319 (Elf_External_Verdaux
*) p
);
2320 p
+= sizeof (Elf_External_Verdaux
);
2322 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2325 struct bfd_elf_version_deps
*n
;
2326 struct elf_link_hash_entry
*h
;
2329 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2332 /* Add a symbol representing this version. */
2334 if (! (_bfd_generic_link_add_one_symbol
2335 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2336 (bfd_vma
) 0, (const char *) NULL
, false,
2337 get_elf_backend_data (dynobj
)->collect
,
2338 (struct bfd_link_hash_entry
**) &h
)))
2340 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2341 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2342 h
->type
= STT_OBJECT
;
2343 h
->verinfo
.vertree
= t
;
2345 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2348 def
.vd_version
= VER_DEF_CURRENT
;
2350 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2351 def
.vd_flags
|= VER_FLG_WEAK
;
2352 def
.vd_ndx
= t
->vernum
+ 1;
2353 def
.vd_cnt
= cdeps
+ 1;
2354 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2355 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2356 if (t
->next
!= NULL
)
2357 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2358 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2362 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2363 (Elf_External_Verdef
*) p
);
2364 p
+= sizeof (Elf_External_Verdef
);
2366 defaux
.vda_name
= h
->dynstr_index
;
2367 if (t
->deps
== NULL
)
2368 defaux
.vda_next
= 0;
2370 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2371 t
->name_indx
= defaux
.vda_name
;
2373 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2374 (Elf_External_Verdaux
*) p
);
2375 p
+= sizeof (Elf_External_Verdaux
);
2377 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2379 defaux
.vda_name
= n
->version_needed
->name_indx
;
2380 if (n
->next
== NULL
)
2381 defaux
.vda_next
= 0;
2383 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2385 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2386 (Elf_External_Verdaux
*) p
);
2387 p
+= sizeof (Elf_External_Verdaux
);
2391 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2392 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2395 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2398 /* Work out the size of the version reference section. */
2400 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2401 BFD_ASSERT (s
!= NULL
);
2403 struct elf_find_verdep_info sinfo
;
2405 sinfo
.output_bfd
= output_bfd
;
2407 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2408 if (sinfo
.vers
== 0)
2410 sinfo
.failed
= false;
2412 elf_link_hash_traverse (elf_hash_table (info
),
2413 elf_link_find_version_dependencies
,
2416 if (elf_tdata (output_bfd
)->verref
== NULL
)
2420 /* We don't have any version definitions, so we can just
2421 remove the section. */
2423 for (spp
= &output_bfd
->sections
;
2424 *spp
!= s
->output_section
;
2425 spp
= &(*spp
)->next
)
2427 *spp
= s
->output_section
->next
;
2428 --output_bfd
->section_count
;
2432 Elf_Internal_Verneed
*t
;
2437 /* Build the version definition section. */
2440 for (t
= elf_tdata (output_bfd
)->verref
;
2444 Elf_Internal_Vernaux
*a
;
2446 size
+= sizeof (Elf_External_Verneed
);
2448 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2449 size
+= sizeof (Elf_External_Vernaux
);
2452 s
->_raw_size
= size
;
2453 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2454 if (s
->contents
== NULL
)
2458 for (t
= elf_tdata (output_bfd
)->verref
;
2463 Elf_Internal_Vernaux
*a
;
2467 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2470 t
->vn_version
= VER_NEED_CURRENT
;
2472 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2473 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2474 elf_dt_name (t
->vn_bfd
),
2477 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2478 t
->vn_bfd
->filename
, true, false);
2479 if (indx
== (bfd_size_type
) -1)
2482 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2483 if (t
->vn_nextref
== NULL
)
2486 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2487 + caux
* sizeof (Elf_External_Vernaux
));
2489 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2490 (Elf_External_Verneed
*) p
);
2491 p
+= sizeof (Elf_External_Verneed
);
2493 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2495 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2497 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2498 a
->vna_nodename
, true, false);
2499 if (indx
== (bfd_size_type
) -1)
2502 if (a
->vna_nextptr
== NULL
)
2505 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2507 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2508 (Elf_External_Vernaux
*) p
);
2509 p
+= sizeof (Elf_External_Vernaux
);
2513 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2514 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2517 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2521 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2523 /* Work out the size of the symbol version section. */
2524 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2525 BFD_ASSERT (s
!= NULL
);
2526 if (dynsymcount
== 0
2527 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2531 /* We don't need any symbol versions; just discard the
2533 for (spp
= &output_bfd
->sections
;
2534 *spp
!= s
->output_section
;
2535 spp
= &(*spp
)->next
)
2537 *spp
= s
->output_section
->next
;
2538 --output_bfd
->section_count
;
2542 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2543 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2544 if (s
->contents
== NULL
)
2547 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2551 /* Set the size of the .dynsym and .hash sections. We counted
2552 the number of dynamic symbols in elf_link_add_object_symbols.
2553 We will build the contents of .dynsym and .hash when we build
2554 the final symbol table, because until then we do not know the
2555 correct value to give the symbols. We built the .dynstr
2556 section as we went along in elf_link_add_object_symbols. */
2557 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2558 BFD_ASSERT (s
!= NULL
);
2559 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2560 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2561 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2564 /* The first entry in .dynsym is a dummy symbol. */
2571 elf_swap_symbol_out (output_bfd
, &isym
,
2572 (PTR
) (Elf_External_Sym
*) s
->contents
);
2574 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2576 bucketcount
= elf_buckets
[i
];
2577 if (dynsymcount
< elf_buckets
[i
+ 1])
2581 s
= bfd_get_section_by_name (dynobj
, ".hash");
2582 BFD_ASSERT (s
!= NULL
);
2583 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2584 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2585 if (s
->contents
== NULL
)
2587 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2589 put_word (output_bfd
, bucketcount
, s
->contents
);
2590 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2592 elf_hash_table (info
)->bucketcount
= bucketcount
;
2594 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2595 BFD_ASSERT (s
!= NULL
);
2596 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2598 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2605 /* Make the backend pick a good value for a dynamic symbol. This is
2606 called via elf_link_hash_traverse, and also calls itself
2610 elf_adjust_dynamic_symbol (h
, data
)
2611 struct elf_link_hash_entry
*h
;
2614 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2616 struct elf_backend_data
*bed
;
2618 /* Ignore indirect symbols. These are added by the versioning code. */
2619 if (h
->root
.type
== bfd_link_hash_indirect
)
2622 /* If this symbol was mentioned in a non-ELF file, try to set
2623 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2624 permit a non-ELF file to correctly refer to a symbol defined in
2625 an ELF dynamic object. */
2626 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2628 if (h
->root
.type
!= bfd_link_hash_defined
2629 && h
->root
.type
!= bfd_link_hash_defweak
)
2630 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2633 if (h
->root
.u
.def
.section
->owner
!= NULL
2634 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2635 == bfd_target_elf_flavour
))
2636 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2638 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2641 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2642 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
2644 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2652 /* If this is a final link, and the symbol was defined as a common
2653 symbol in a regular object file, and there was no definition in
2654 any dynamic object, then the linker will have allocated space for
2655 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2656 flag will not have been set. */
2657 if (h
->root
.type
== bfd_link_hash_defined
2658 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2659 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2660 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2661 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2662 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2664 /* If -Bsymbolic was used (which means to bind references to global
2665 symbols to the definition within the shared object), and this
2666 symbol was defined in a regular object, then it actually doesn't
2667 need a PLT entry. */
2668 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2669 && eif
->info
->shared
2670 && eif
->info
->symbolic
2671 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2672 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2674 /* If this symbol does not require a PLT entry, and it is not
2675 defined by a dynamic object, or is not referenced by a regular
2676 object, ignore it. We do have to handle a weak defined symbol,
2677 even if no regular object refers to it, if we decided to add it
2678 to the dynamic symbol table. FIXME: Do we normally need to worry
2679 about symbols which are defined by one dynamic object and
2680 referenced by another one? */
2681 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2682 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2683 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2684 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2685 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2688 /* If we've already adjusted this symbol, don't do it again. This
2689 can happen via a recursive call. */
2690 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2693 /* Don't look at this symbol again. Note that we must set this
2694 after checking the above conditions, because we may look at a
2695 symbol once, decide not to do anything, and then get called
2696 recursively later after REF_REGULAR is set below. */
2697 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2699 /* If this is a weak definition, and we know a real definition, and
2700 the real symbol is not itself defined by a regular object file,
2701 then get a good value for the real definition. We handle the
2702 real symbol first, for the convenience of the backend routine.
2704 Note that there is a confusing case here. If the real definition
2705 is defined by a regular object file, we don't get the real symbol
2706 from the dynamic object, but we do get the weak symbol. If the
2707 processor backend uses a COPY reloc, then if some routine in the
2708 dynamic object changes the real symbol, we will not see that
2709 change in the corresponding weak symbol. This is the way other
2710 ELF linkers work as well, and seems to be a result of the shared
2713 I will clarify this issue. Most SVR4 shared libraries define the
2714 variable _timezone and define timezone as a weak synonym. The
2715 tzset call changes _timezone. If you write
2716 extern int timezone;
2718 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2719 you might expect that, since timezone is a synonym for _timezone,
2720 the same number will print both times. However, if the processor
2721 backend uses a COPY reloc, then actually timezone will be copied
2722 into your process image, and, since you define _timezone
2723 yourself, _timezone will not. Thus timezone and _timezone will
2724 wind up at different memory locations. The tzset call will set
2725 _timezone, leaving timezone unchanged. */
2727 if (h
->weakdef
!= NULL
)
2729 struct elf_link_hash_entry
*weakdef
;
2731 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2732 || h
->root
.type
== bfd_link_hash_defweak
);
2733 weakdef
= h
->weakdef
;
2734 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2735 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2736 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2737 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2739 /* This symbol is defined by a regular object file, so we
2740 will not do anything special. Clear weakdef for the
2741 convenience of the processor backend. */
2746 /* There is an implicit reference by a regular object file
2747 via the weak symbol. */
2748 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2749 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2754 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2755 bed
= get_elf_backend_data (dynobj
);
2756 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2765 /* This routine is used to export all defined symbols into the dynamic
2766 symbol table. It is called via elf_link_hash_traverse. */
2769 elf_export_symbol (h
, data
)
2770 struct elf_link_hash_entry
*h
;
2773 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2775 /* Ignore indirect symbols. These are added by the versioning code. */
2776 if (h
->root
.type
== bfd_link_hash_indirect
)
2779 if (h
->dynindx
== -1
2780 && (h
->elf_link_hash_flags
2781 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2783 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2793 /* Look through the symbols which are defined in other shared
2794 libraries and referenced here. Update the list of version
2795 dependencies. This will be put into the .gnu.version_r section.
2796 This function is called via elf_link_hash_traverse. */
2799 elf_link_find_version_dependencies (h
, data
)
2800 struct elf_link_hash_entry
*h
;
2803 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2804 Elf_Internal_Verneed
*t
;
2805 Elf_Internal_Vernaux
*a
;
2807 /* We only care about symbols defined in shared objects with version
2809 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2810 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2812 || h
->verinfo
.verdef
== NULL
)
2815 /* See if we already know about this version. */
2816 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
2818 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2821 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2822 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2828 /* This is a new version. Add it to tree we are building. */
2832 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
2835 rinfo
->failed
= true;
2839 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2840 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
2841 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
2844 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
2846 /* Note that we are copying a string pointer here, and testing it
2847 above. If bfd_elf_string_from_elf_section is ever changed to
2848 discard the string data when low in memory, this will have to be
2850 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2852 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2853 a
->vna_nextptr
= t
->vn_auxptr
;
2855 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2858 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2865 /* Figure out appropriate versions for all the symbols. We may not
2866 have the version number script until we have read all of the input
2867 files, so until that point we don't know which symbols should be
2868 local. This function is called via elf_link_hash_traverse. */
2871 elf_link_assign_sym_version (h
, data
)
2872 struct elf_link_hash_entry
*h
;
2875 struct elf_assign_sym_version_info
*sinfo
=
2876 (struct elf_assign_sym_version_info
*) data
;
2877 struct bfd_link_info
*info
= sinfo
->info
;
2880 /* We only need version numbers for symbols defined in regular
2882 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2885 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2886 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2888 struct bfd_elf_version_tree
*t
;
2893 /* There are two consecutive ELF_VER_CHR characters if this is
2894 not a hidden symbol. */
2896 if (*p
== ELF_VER_CHR
)
2902 /* If there is no version string, we can just return out. */
2906 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
2910 /* Look for the version. If we find it, it is no longer weak. */
2911 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
2913 if (strcmp (t
->name
, p
) == 0)
2915 h
->verinfo
.vertree
= t
;
2918 /* See if there is anything to force this symbol to
2920 if (t
->locals
!= NULL
)
2924 struct bfd_elf_version_expr
*d
;
2926 len
= p
- h
->root
.root
.string
;
2927 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
2930 strncpy (alc
, h
->root
.root
.string
, len
- 1);
2931 alc
[len
- 1] = '\0';
2932 if (alc
[len
- 2] == ELF_VER_CHR
)
2933 alc
[len
- 2] = '\0';
2935 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
2937 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
2938 || fnmatch (d
->match
, alc
, 0) == 0)
2940 if (h
->dynindx
!= -1
2942 && ! sinfo
->export_dynamic
2943 && (h
->elf_link_hash_flags
2944 & ELF_LINK_HASH_NEEDS_PLT
) == 0)
2946 sinfo
->removed_dynamic
= true;
2947 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
2949 /* FIXME: The name of the symbol has
2950 already been recorded in the dynamic
2951 string table section. */
2958 bfd_release (sinfo
->output_bfd
, alc
);
2965 /* If we are building an application, we need to create a
2966 version node for this version. */
2967 if (t
== NULL
&& ! info
->shared
)
2969 struct bfd_elf_version_tree
**pp
;
2972 /* If we aren't going to export this symbol, we don't need
2973 to worry about it. */
2974 if (h
->dynindx
== -1)
2977 t
= ((struct bfd_elf_version_tree
*)
2978 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
2981 sinfo
->failed
= true;
2990 t
->name_indx
= (unsigned int) -1;
2994 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
2996 t
->vernum
= version_index
;
3000 h
->verinfo
.vertree
= t
;
3004 /* We could not find the version for a symbol when
3005 generating a shared archive. Return an error. */
3006 (*_bfd_error_handler
)
3007 ("%s: undefined version name %s",
3008 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3009 bfd_set_error (bfd_error_bad_value
);
3010 sinfo
->failed
= true;
3015 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3018 /* If we don't have a version for this symbol, see if we can find
3020 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3022 struct bfd_elf_version_tree
*t
;
3023 struct bfd_elf_version_tree
*deflt
;
3024 struct bfd_elf_version_expr
*d
;
3026 /* See if can find what version this symbol is in. If the
3027 symbol is supposed to eb local, then don't actually register
3030 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3032 if (t
->globals
!= NULL
)
3034 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3036 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3038 h
->verinfo
.vertree
= t
;
3047 if (t
->locals
!= NULL
)
3049 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3051 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
3053 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3055 h
->verinfo
.vertree
= t
;
3056 if (h
->dynindx
!= -1
3058 && ! sinfo
->export_dynamic
3059 && (h
->elf_link_hash_flags
3060 & ELF_LINK_HASH_NEEDS_PLT
) == 0)
3062 sinfo
->removed_dynamic
= true;
3063 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3065 /* FIXME: The name of the symbol has already
3066 been recorded in the dynamic string table
3078 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3080 h
->verinfo
.vertree
= deflt
;
3081 if (h
->dynindx
!= -1
3083 && ! sinfo
->export_dynamic
3084 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3086 sinfo
->removed_dynamic
= true;
3087 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3089 /* FIXME: The name of the symbol has already been
3090 recorded in the dynamic string table section. */
3098 /* This function is used to renumber the dynamic symbols, if some of
3099 them are removed because they are marked as local. This is called
3100 via elf_link_hash_traverse. */
3103 elf_link_renumber_dynsyms (h
, data
)
3104 struct elf_link_hash_entry
*h
;
3107 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3109 if (h
->dynindx
!= -1)
3111 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3112 ++elf_hash_table (info
)->dynsymcount
;
3118 /* Final phase of ELF linker. */
3120 /* A structure we use to avoid passing large numbers of arguments. */
3122 struct elf_final_link_info
3124 /* General link information. */
3125 struct bfd_link_info
*info
;
3128 /* Symbol string table. */
3129 struct bfd_strtab_hash
*symstrtab
;
3130 /* .dynsym section. */
3131 asection
*dynsym_sec
;
3132 /* .hash section. */
3134 /* symbol version section (.gnu.version). */
3135 asection
*symver_sec
;
3136 /* Buffer large enough to hold contents of any section. */
3138 /* Buffer large enough to hold external relocs of any section. */
3139 PTR external_relocs
;
3140 /* Buffer large enough to hold internal relocs of any section. */
3141 Elf_Internal_Rela
*internal_relocs
;
3142 /* Buffer large enough to hold external local symbols of any input
3144 Elf_External_Sym
*external_syms
;
3145 /* Buffer large enough to hold internal local symbols of any input
3147 Elf_Internal_Sym
*internal_syms
;
3148 /* Array large enough to hold a symbol index for each local symbol
3149 of any input BFD. */
3151 /* Array large enough to hold a section pointer for each local
3152 symbol of any input BFD. */
3153 asection
**sections
;
3154 /* Buffer to hold swapped out symbols. */
3155 Elf_External_Sym
*symbuf
;
3156 /* Number of swapped out symbols in buffer. */
3157 size_t symbuf_count
;
3158 /* Number of symbols which fit in symbuf. */
3162 static boolean elf_link_output_sym
3163 PARAMS ((struct elf_final_link_info
*, const char *,
3164 Elf_Internal_Sym
*, asection
*));
3165 static boolean elf_link_flush_output_syms
3166 PARAMS ((struct elf_final_link_info
*));
3167 static boolean elf_link_output_extsym
3168 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3169 static boolean elf_link_input_bfd
3170 PARAMS ((struct elf_final_link_info
*, bfd
*));
3171 static boolean elf_reloc_link_order
3172 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3173 struct bfd_link_order
*));
3175 /* This struct is used to pass information to elf_link_output_extsym. */
3177 struct elf_outext_info
3181 struct elf_final_link_info
*finfo
;
3184 /* Do the final step of an ELF link. */
3187 elf_bfd_final_link (abfd
, info
)
3189 struct bfd_link_info
*info
;
3193 struct elf_final_link_info finfo
;
3194 register asection
*o
;
3195 register struct bfd_link_order
*p
;
3197 size_t max_contents_size
;
3198 size_t max_external_reloc_size
;
3199 size_t max_internal_reloc_count
;
3200 size_t max_sym_count
;
3202 Elf_Internal_Sym elfsym
;
3204 Elf_Internal_Shdr
*symtab_hdr
;
3205 Elf_Internal_Shdr
*symstrtab_hdr
;
3206 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3207 struct elf_outext_info eoinfo
;
3210 abfd
->flags
|= DYNAMIC
;
3212 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3213 dynobj
= elf_hash_table (info
)->dynobj
;
3216 finfo
.output_bfd
= abfd
;
3217 finfo
.symstrtab
= elf_stringtab_init ();
3218 if (finfo
.symstrtab
== NULL
)
3223 finfo
.dynsym_sec
= NULL
;
3224 finfo
.hash_sec
= NULL
;
3225 finfo
.symver_sec
= NULL
;
3229 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3230 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3231 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3232 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3233 /* Note that it is OK if symver_sec is NULL. */
3236 finfo
.contents
= NULL
;
3237 finfo
.external_relocs
= NULL
;
3238 finfo
.internal_relocs
= NULL
;
3239 finfo
.external_syms
= NULL
;
3240 finfo
.internal_syms
= NULL
;
3241 finfo
.indices
= NULL
;
3242 finfo
.sections
= NULL
;
3243 finfo
.symbuf
= NULL
;
3244 finfo
.symbuf_count
= 0;
3246 /* Count up the number of relocations we will output for each output
3247 section, so that we know the sizes of the reloc sections. We
3248 also figure out some maximum sizes. */
3249 max_contents_size
= 0;
3250 max_external_reloc_size
= 0;
3251 max_internal_reloc_count
= 0;
3253 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3257 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3259 if (p
->type
== bfd_section_reloc_link_order
3260 || p
->type
== bfd_symbol_reloc_link_order
)
3262 else if (p
->type
== bfd_indirect_link_order
)
3266 sec
= p
->u
.indirect
.section
;
3268 /* Mark all sections which are to be included in the
3269 link. This will normally be every section. We need
3270 to do this so that we can identify any sections which
3271 the linker has decided to not include. */
3272 sec
->linker_mark
= true;
3274 if (info
->relocateable
)
3275 o
->reloc_count
+= sec
->reloc_count
;
3277 if (sec
->_raw_size
> max_contents_size
)
3278 max_contents_size
= sec
->_raw_size
;
3279 if (sec
->_cooked_size
> max_contents_size
)
3280 max_contents_size
= sec
->_cooked_size
;
3282 /* We are interested in just local symbols, not all
3284 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3285 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3289 if (elf_bad_symtab (sec
->owner
))
3290 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3291 / sizeof (Elf_External_Sym
));
3293 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3295 if (sym_count
> max_sym_count
)
3296 max_sym_count
= sym_count
;
3298 if ((sec
->flags
& SEC_RELOC
) != 0)
3302 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3303 if (ext_size
> max_external_reloc_size
)
3304 max_external_reloc_size
= ext_size
;
3305 if (sec
->reloc_count
> max_internal_reloc_count
)
3306 max_internal_reloc_count
= sec
->reloc_count
;
3312 if (o
->reloc_count
> 0)
3313 o
->flags
|= SEC_RELOC
;
3316 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3317 set it (this is probably a bug) and if it is set
3318 assign_section_numbers will create a reloc section. */
3319 o
->flags
&=~ SEC_RELOC
;
3322 /* If the SEC_ALLOC flag is not set, force the section VMA to
3323 zero. This is done in elf_fake_sections as well, but forcing
3324 the VMA to 0 here will ensure that relocs against these
3325 sections are handled correctly. */
3326 if ((o
->flags
& SEC_ALLOC
) == 0
3327 && ! o
->user_set_vma
)
3331 /* Figure out the file positions for everything but the symbol table
3332 and the relocs. We set symcount to force assign_section_numbers
3333 to create a symbol table. */
3334 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3335 BFD_ASSERT (! abfd
->output_has_begun
);
3336 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3339 /* That created the reloc sections. Set their sizes, and assign
3340 them file positions, and allocate some buffers. */
3341 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3343 if ((o
->flags
& SEC_RELOC
) != 0)
3345 Elf_Internal_Shdr
*rel_hdr
;
3346 register struct elf_link_hash_entry
**p
, **pend
;
3348 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3350 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3352 /* The contents field must last into write_object_contents,
3353 so we allocate it with bfd_alloc rather than malloc. */
3354 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3355 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3358 p
= ((struct elf_link_hash_entry
**)
3359 bfd_malloc (o
->reloc_count
3360 * sizeof (struct elf_link_hash_entry
*)));
3361 if (p
== NULL
&& o
->reloc_count
!= 0)
3363 elf_section_data (o
)->rel_hashes
= p
;
3364 pend
= p
+ o
->reloc_count
;
3365 for (; p
< pend
; p
++)
3368 /* Use the reloc_count field as an index when outputting the
3374 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3376 /* We have now assigned file positions for all the sections except
3377 .symtab and .strtab. We start the .symtab section at the current
3378 file position, and write directly to it. We build the .strtab
3379 section in memory. */
3381 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3382 /* sh_name is set in prep_headers. */
3383 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3384 symtab_hdr
->sh_flags
= 0;
3385 symtab_hdr
->sh_addr
= 0;
3386 symtab_hdr
->sh_size
= 0;
3387 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3388 /* sh_link is set in assign_section_numbers. */
3389 /* sh_info is set below. */
3390 /* sh_offset is set just below. */
3391 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3393 off
= elf_tdata (abfd
)->next_file_pos
;
3394 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3396 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3397 incorrect. We do not yet know the size of the .symtab section.
3398 We correct next_file_pos below, after we do know the size. */
3400 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3401 continuously seeking to the right position in the file. */
3402 if (! info
->keep_memory
|| max_sym_count
< 20)
3403 finfo
.symbuf_size
= 20;
3405 finfo
.symbuf_size
= max_sym_count
;
3406 finfo
.symbuf
= ((Elf_External_Sym
*)
3407 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3408 if (finfo
.symbuf
== NULL
)
3411 /* Start writing out the symbol table. The first symbol is always a
3413 if (info
->strip
!= strip_all
|| info
->relocateable
)
3415 elfsym
.st_value
= 0;
3418 elfsym
.st_other
= 0;
3419 elfsym
.st_shndx
= SHN_UNDEF
;
3420 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3421 &elfsym
, bfd_und_section_ptr
))
3426 /* Some standard ELF linkers do this, but we don't because it causes
3427 bootstrap comparison failures. */
3428 /* Output a file symbol for the output file as the second symbol.
3429 We output this even if we are discarding local symbols, although
3430 I'm not sure if this is correct. */
3431 elfsym
.st_value
= 0;
3433 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3434 elfsym
.st_other
= 0;
3435 elfsym
.st_shndx
= SHN_ABS
;
3436 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3437 &elfsym
, bfd_abs_section_ptr
))
3441 /* Output a symbol for each section. We output these even if we are
3442 discarding local symbols, since they are used for relocs. These
3443 symbols have no names. We store the index of each one in the
3444 index field of the section, so that we can find it again when
3445 outputting relocs. */
3446 if (info
->strip
!= strip_all
|| info
->relocateable
)
3449 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3450 elfsym
.st_other
= 0;
3451 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3453 o
= section_from_elf_index (abfd
, i
);
3455 o
->target_index
= abfd
->symcount
;
3456 elfsym
.st_shndx
= i
;
3457 if (info
->relocateable
|| o
== NULL
)
3458 elfsym
.st_value
= 0;
3460 elfsym
.st_value
= o
->vma
;
3461 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3467 /* Allocate some memory to hold information read in from the input
3469 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3470 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3471 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3472 bfd_malloc (max_internal_reloc_count
3473 * sizeof (Elf_Internal_Rela
)));
3474 finfo
.external_syms
= ((Elf_External_Sym
*)
3475 bfd_malloc (max_sym_count
3476 * sizeof (Elf_External_Sym
)));
3477 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3478 bfd_malloc (max_sym_count
3479 * sizeof (Elf_Internal_Sym
)));
3480 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3481 finfo
.sections
= ((asection
**)
3482 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3483 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3484 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3485 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3486 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3487 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3488 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3489 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3492 /* Since ELF permits relocations to be against local symbols, we
3493 must have the local symbols available when we do the relocations.
3494 Since we would rather only read the local symbols once, and we
3495 would rather not keep them in memory, we handle all the
3496 relocations for a single input file at the same time.
3498 Unfortunately, there is no way to know the total number of local
3499 symbols until we have seen all of them, and the local symbol
3500 indices precede the global symbol indices. This means that when
3501 we are generating relocateable output, and we see a reloc against
3502 a global symbol, we can not know the symbol index until we have
3503 finished examining all the local symbols to see which ones we are
3504 going to output. To deal with this, we keep the relocations in
3505 memory, and don't output them until the end of the link. This is
3506 an unfortunate waste of memory, but I don't see a good way around
3507 it. Fortunately, it only happens when performing a relocateable
3508 link, which is not the common case. FIXME: If keep_memory is set
3509 we could write the relocs out and then read them again; I don't
3510 know how bad the memory loss will be. */
3512 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
3513 sub
->output_has_begun
= false;
3514 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3516 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3518 if (p
->type
== bfd_indirect_link_order
3519 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3520 == bfd_target_elf_flavour
))
3522 sub
= p
->u
.indirect
.section
->owner
;
3523 if (! sub
->output_has_begun
)
3525 if (! elf_link_input_bfd (&finfo
, sub
))
3527 sub
->output_has_begun
= true;
3530 else if (p
->type
== bfd_section_reloc_link_order
3531 || p
->type
== bfd_symbol_reloc_link_order
)
3533 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3538 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3544 /* That wrote out all the local symbols. Finish up the symbol table
3545 with the global symbols. */
3547 if (info
->strip
!= strip_all
&& info
->shared
)
3549 /* Output any global symbols that got converted to local in a
3550 version script. We do this in a separate step since ELF
3551 requires all local symbols to appear prior to any global
3552 symbols. FIXME: We should only do this if some global
3553 symbols were, in fact, converted to become local. FIXME:
3554 Will this work correctly with the Irix 5 linker? */
3555 eoinfo
.failed
= false;
3556 eoinfo
.finfo
= &finfo
;
3557 eoinfo
.localsyms
= true;
3558 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3564 /* The sh_info field records the index of the first non local
3566 symtab_hdr
->sh_info
= abfd
->symcount
;
3568 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3570 /* We get the global symbols from the hash table. */
3571 eoinfo
.failed
= false;
3572 eoinfo
.localsyms
= false;
3573 eoinfo
.finfo
= &finfo
;
3574 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3579 /* Flush all symbols to the file. */
3580 if (! elf_link_flush_output_syms (&finfo
))
3583 /* Now we know the size of the symtab section. */
3584 off
+= symtab_hdr
->sh_size
;
3586 /* Finish up and write out the symbol string table (.strtab)
3588 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3589 /* sh_name was set in prep_headers. */
3590 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3591 symstrtab_hdr
->sh_flags
= 0;
3592 symstrtab_hdr
->sh_addr
= 0;
3593 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3594 symstrtab_hdr
->sh_entsize
= 0;
3595 symstrtab_hdr
->sh_link
= 0;
3596 symstrtab_hdr
->sh_info
= 0;
3597 /* sh_offset is set just below. */
3598 symstrtab_hdr
->sh_addralign
= 1;
3600 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3601 elf_tdata (abfd
)->next_file_pos
= off
;
3603 if (abfd
->symcount
> 0)
3605 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3606 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3610 /* Adjust the relocs to have the correct symbol indices. */
3611 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3613 struct elf_link_hash_entry
**rel_hash
;
3614 Elf_Internal_Shdr
*rel_hdr
;
3616 if ((o
->flags
& SEC_RELOC
) == 0)
3619 rel_hash
= elf_section_data (o
)->rel_hashes
;
3620 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3621 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3623 if (*rel_hash
== NULL
)
3626 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3628 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3630 Elf_External_Rel
*erel
;
3631 Elf_Internal_Rel irel
;
3633 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3634 elf_swap_reloc_in (abfd
, erel
, &irel
);
3635 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3636 ELF_R_TYPE (irel
.r_info
));
3637 elf_swap_reloc_out (abfd
, &irel
, erel
);
3641 Elf_External_Rela
*erela
;
3642 Elf_Internal_Rela irela
;
3644 BFD_ASSERT (rel_hdr
->sh_entsize
3645 == sizeof (Elf_External_Rela
));
3647 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3648 elf_swap_reloca_in (abfd
, erela
, &irela
);
3649 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3650 ELF_R_TYPE (irela
.r_info
));
3651 elf_swap_reloca_out (abfd
, &irela
, erela
);
3655 /* Set the reloc_count field to 0 to prevent write_relocs from
3656 trying to swap the relocs out itself. */
3660 /* If we are linking against a dynamic object, or generating a
3661 shared library, finish up the dynamic linking information. */
3664 Elf_External_Dyn
*dyncon
, *dynconend
;
3666 /* Fix up .dynamic entries. */
3667 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3668 BFD_ASSERT (o
!= NULL
);
3670 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3671 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3672 for (; dyncon
< dynconend
; dyncon
++)
3674 Elf_Internal_Dyn dyn
;
3678 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3685 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3686 magic _init and _fini symbols. This is pretty ugly,
3687 but we are compatible. */
3695 struct elf_link_hash_entry
*h
;
3697 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3698 false, false, true);
3700 && (h
->root
.type
== bfd_link_hash_defined
3701 || h
->root
.type
== bfd_link_hash_defweak
))
3703 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3704 o
= h
->root
.u
.def
.section
;
3705 if (o
->output_section
!= NULL
)
3706 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3707 + o
->output_offset
);
3710 /* The symbol is imported from another shared
3711 library and does not apply to this one. */
3715 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3730 name
= ".gnu.version_d";
3733 name
= ".gnu.version_r";
3736 name
= ".gnu.version";
3738 o
= bfd_get_section_by_name (abfd
, name
);
3739 BFD_ASSERT (o
!= NULL
);
3740 dyn
.d_un
.d_ptr
= o
->vma
;
3741 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3748 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3753 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3755 Elf_Internal_Shdr
*hdr
;
3757 hdr
= elf_elfsections (abfd
)[i
];
3758 if (hdr
->sh_type
== type
3759 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3761 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3762 dyn
.d_un
.d_val
+= hdr
->sh_size
;
3765 if (dyn
.d_un
.d_val
== 0
3766 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
3767 dyn
.d_un
.d_val
= hdr
->sh_addr
;
3771 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3777 /* If we have created any dynamic sections, then output them. */
3780 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
3783 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
3785 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
3786 || o
->_raw_size
== 0)
3788 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
3790 /* At this point, we are only interested in sections
3791 created by elf_link_create_dynamic_sections. */
3794 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
3796 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
3798 if (! bfd_set_section_contents (abfd
, o
->output_section
,
3799 o
->contents
, o
->output_offset
,
3807 /* The contents of the .dynstr section are actually in a
3809 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
3810 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
3811 || ! _bfd_stringtab_emit (abfd
,
3812 elf_hash_table (info
)->dynstr
))
3818 /* If we have optimized stabs strings, output them. */
3819 if (elf_hash_table (info
)->stab_info
!= NULL
)
3821 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
3825 if (finfo
.symstrtab
!= NULL
)
3826 _bfd_stringtab_free (finfo
.symstrtab
);
3827 if (finfo
.contents
!= NULL
)
3828 free (finfo
.contents
);
3829 if (finfo
.external_relocs
!= NULL
)
3830 free (finfo
.external_relocs
);
3831 if (finfo
.internal_relocs
!= NULL
)
3832 free (finfo
.internal_relocs
);
3833 if (finfo
.external_syms
!= NULL
)
3834 free (finfo
.external_syms
);
3835 if (finfo
.internal_syms
!= NULL
)
3836 free (finfo
.internal_syms
);
3837 if (finfo
.indices
!= NULL
)
3838 free (finfo
.indices
);
3839 if (finfo
.sections
!= NULL
)
3840 free (finfo
.sections
);
3841 if (finfo
.symbuf
!= NULL
)
3842 free (finfo
.symbuf
);
3843 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3845 if ((o
->flags
& SEC_RELOC
) != 0
3846 && elf_section_data (o
)->rel_hashes
!= NULL
)
3847 free (elf_section_data (o
)->rel_hashes
);
3850 elf_tdata (abfd
)->linker
= true;
3855 if (finfo
.symstrtab
!= NULL
)
3856 _bfd_stringtab_free (finfo
.symstrtab
);
3857 if (finfo
.contents
!= NULL
)
3858 free (finfo
.contents
);
3859 if (finfo
.external_relocs
!= NULL
)
3860 free (finfo
.external_relocs
);
3861 if (finfo
.internal_relocs
!= NULL
)
3862 free (finfo
.internal_relocs
);
3863 if (finfo
.external_syms
!= NULL
)
3864 free (finfo
.external_syms
);
3865 if (finfo
.internal_syms
!= NULL
)
3866 free (finfo
.internal_syms
);
3867 if (finfo
.indices
!= NULL
)
3868 free (finfo
.indices
);
3869 if (finfo
.sections
!= NULL
)
3870 free (finfo
.sections
);
3871 if (finfo
.symbuf
!= NULL
)
3872 free (finfo
.symbuf
);
3873 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3875 if ((o
->flags
& SEC_RELOC
) != 0
3876 && elf_section_data (o
)->rel_hashes
!= NULL
)
3877 free (elf_section_data (o
)->rel_hashes
);
3883 /* Add a symbol to the output symbol table. */
3886 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
3887 struct elf_final_link_info
*finfo
;
3889 Elf_Internal_Sym
*elfsym
;
3890 asection
*input_sec
;
3892 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
3893 struct bfd_link_info
*info
,
3898 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
3899 elf_backend_link_output_symbol_hook
;
3900 if (output_symbol_hook
!= NULL
)
3902 if (! ((*output_symbol_hook
)
3903 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
3907 if (name
== (const char *) NULL
|| *name
== '\0')
3908 elfsym
->st_name
= 0;
3911 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
3914 if (elfsym
->st_name
== (unsigned long) -1)
3918 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
3920 if (! elf_link_flush_output_syms (finfo
))
3924 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
3925 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
3926 ++finfo
->symbuf_count
;
3928 ++finfo
->output_bfd
->symcount
;
3933 /* Flush the output symbols to the file. */
3936 elf_link_flush_output_syms (finfo
)
3937 struct elf_final_link_info
*finfo
;
3939 if (finfo
->symbuf_count
> 0)
3941 Elf_Internal_Shdr
*symtab
;
3943 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
3945 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
3947 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
3948 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
3949 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
3952 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
3954 finfo
->symbuf_count
= 0;
3960 /* Add an external symbol to the symbol table. This is called from
3961 the hash table traversal routine. When generating a shared object,
3962 we go through the symbol table twice. The first time we output
3963 anything that might have been forced to local scope in a version
3964 script. The second time we output the symbols that are still
3968 elf_link_output_extsym (h
, data
)
3969 struct elf_link_hash_entry
*h
;
3972 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
3973 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
3975 Elf_Internal_Sym sym
;
3976 asection
*input_sec
;
3978 /* Decide whether to output this symbol in this pass. */
3979 if (eoinfo
->localsyms
)
3981 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
3986 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
3990 /* If we are not creating a shared library, and this symbol is
3991 referenced by a shared library but is not defined anywhere, then
3992 warn that it is undefined. If we do not do this, the runtime
3993 linker will complain that the symbol is undefined when the
3994 program is run. We don't have to worry about symbols that are
3995 referenced by regular files, because we will already have issued
3996 warnings for them. */
3997 if (! finfo
->info
->relocateable
3998 && ! finfo
->info
->shared
3999 && h
->root
.type
== bfd_link_hash_undefined
4000 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4001 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4003 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4004 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4005 (asection
*) NULL
, 0)))
4007 eoinfo
->failed
= true;
4012 /* We don't want to output symbols that have never been mentioned by
4013 a regular file, or that we have been told to strip. However, if
4014 h->indx is set to -2, the symbol is used by a reloc and we must
4018 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4019 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4020 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4021 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4023 else if (finfo
->info
->strip
== strip_all
4024 || (finfo
->info
->strip
== strip_some
4025 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4026 h
->root
.root
.string
,
4027 false, false) == NULL
))
4032 /* If we're stripping it, and it's not a dynamic symbol, there's
4033 nothing else to do. */
4034 if (strip
&& h
->dynindx
== -1)
4038 sym
.st_size
= h
->size
;
4039 sym
.st_other
= h
->other
;
4040 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4041 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4042 else if (h
->root
.type
== bfd_link_hash_undefweak
4043 || h
->root
.type
== bfd_link_hash_defweak
)
4044 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4046 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4048 switch (h
->root
.type
)
4051 case bfd_link_hash_new
:
4055 case bfd_link_hash_undefined
:
4056 input_sec
= bfd_und_section_ptr
;
4057 sym
.st_shndx
= SHN_UNDEF
;
4060 case bfd_link_hash_undefweak
:
4061 input_sec
= bfd_und_section_ptr
;
4062 sym
.st_shndx
= SHN_UNDEF
;
4065 case bfd_link_hash_defined
:
4066 case bfd_link_hash_defweak
:
4068 input_sec
= h
->root
.u
.def
.section
;
4069 if (input_sec
->output_section
!= NULL
)
4072 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4073 input_sec
->output_section
);
4074 if (sym
.st_shndx
== (unsigned short) -1)
4076 eoinfo
->failed
= true;
4080 /* ELF symbols in relocateable files are section relative,
4081 but in nonrelocateable files they are virtual
4083 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4084 if (! finfo
->info
->relocateable
)
4085 sym
.st_value
+= input_sec
->output_section
->vma
;
4089 BFD_ASSERT (input_sec
->owner
== NULL
4090 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4091 sym
.st_shndx
= SHN_UNDEF
;
4092 input_sec
= bfd_und_section_ptr
;
4097 case bfd_link_hash_common
:
4098 input_sec
= bfd_com_section_ptr
;
4099 sym
.st_shndx
= SHN_COMMON
;
4100 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4103 case bfd_link_hash_indirect
:
4104 /* These symbols are created by symbol versioning. They point
4105 to the decorated version of the name. For example, if the
4106 symbol foo@@GNU_1.2 is the default, which should be used when
4107 foo is used with no version, then we add an indirect symbol
4108 foo which points to foo@@GNU_1.2. We ignore these symbols,
4109 since the indirected symbol is already in the hash table. If
4110 the indirect symbol is non-ELF, fall through and output it. */
4111 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4115 case bfd_link_hash_warning
:
4116 /* We can't represent these symbols in ELF, although a warning
4117 symbol may have come from a .gnu.warning.SYMBOL section. We
4118 just put the target symbol in the hash table. If the target
4119 symbol does not really exist, don't do anything. */
4120 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4122 return (elf_link_output_extsym
4123 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4126 /* Give the processor backend a chance to tweak the symbol value,
4127 and also to finish up anything that needs to be done for this
4129 if ((h
->dynindx
!= -1
4130 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4131 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4133 struct elf_backend_data
*bed
;
4135 bed
= get_elf_backend_data (finfo
->output_bfd
);
4136 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4137 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4139 eoinfo
->failed
= true;
4144 /* If this symbol should be put in the .dynsym section, then put it
4145 there now. We have already know the symbol index. We also fill
4146 in the entry in the .hash section. */
4147 if (h
->dynindx
!= -1
4148 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4150 struct elf_backend_data
*bed
;
4155 bfd_byte
*bucketpos
;
4158 sym
.st_name
= h
->dynstr_index
;
4160 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4161 (PTR
) (((Elf_External_Sym
*)
4162 finfo
->dynsym_sec
->contents
)
4165 /* We didn't include the version string in the dynamic string
4166 table, so we must not consider it in the hash table. */
4167 name
= h
->root
.root
.string
;
4168 p
= strchr (name
, ELF_VER_CHR
);
4173 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4174 strncpy (copy
, name
, p
- name
);
4175 copy
[p
- name
] = '\0';
4179 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4180 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4181 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4182 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4183 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4184 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4185 put_word (finfo
->output_bfd
, chain
,
4186 ((bfd_byte
*) finfo
->hash_sec
->contents
4187 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4190 bfd_release (finfo
->output_bfd
, copy
);
4192 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4194 Elf_Internal_Versym iversym
;
4196 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4198 if (h
->verinfo
.verdef
== NULL
)
4199 iversym
.vs_vers
= 0;
4201 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4205 if (h
->verinfo
.vertree
== NULL
)
4206 iversym
.vs_vers
= 1;
4208 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4211 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4212 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4214 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4215 (((Elf_External_Versym
*)
4216 finfo
->symver_sec
->contents
)
4221 /* If we're stripping it, then it was just a dynamic symbol, and
4222 there's nothing else to do. */
4226 h
->indx
= finfo
->output_bfd
->symcount
;
4228 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4230 eoinfo
->failed
= true;
4237 /* Link an input file into the linker output file. This function
4238 handles all the sections and relocations of the input file at once.
4239 This is so that we only have to read the local symbols once, and
4240 don't have to keep them in memory. */
4243 elf_link_input_bfd (finfo
, input_bfd
)
4244 struct elf_final_link_info
*finfo
;
4247 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4248 bfd
*, asection
*, bfd_byte
*,
4249 Elf_Internal_Rela
*,
4250 Elf_Internal_Sym
*, asection
**));
4252 Elf_Internal_Shdr
*symtab_hdr
;
4255 Elf_External_Sym
*external_syms
;
4256 Elf_External_Sym
*esym
;
4257 Elf_External_Sym
*esymend
;
4258 Elf_Internal_Sym
*isym
;
4260 asection
**ppsection
;
4263 output_bfd
= finfo
->output_bfd
;
4265 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4267 /* If this is a dynamic object, we don't want to do anything here:
4268 we don't want the local symbols, and we don't want the section
4270 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4273 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4274 if (elf_bad_symtab (input_bfd
))
4276 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4281 locsymcount
= symtab_hdr
->sh_info
;
4282 extsymoff
= symtab_hdr
->sh_info
;
4285 /* Read the local symbols. */
4286 if (symtab_hdr
->contents
!= NULL
)
4287 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4288 else if (locsymcount
== 0)
4289 external_syms
= NULL
;
4292 external_syms
= finfo
->external_syms
;
4293 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4294 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4295 locsymcount
, input_bfd
)
4296 != locsymcount
* sizeof (Elf_External_Sym
)))
4300 /* Swap in the local symbols and write out the ones which we know
4301 are going into the output file. */
4302 esym
= external_syms
;
4303 esymend
= esym
+ locsymcount
;
4304 isym
= finfo
->internal_syms
;
4305 pindex
= finfo
->indices
;
4306 ppsection
= finfo
->sections
;
4307 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4311 Elf_Internal_Sym osym
;
4313 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4316 if (elf_bad_symtab (input_bfd
))
4318 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4325 if (isym
->st_shndx
== SHN_UNDEF
)
4326 isec
= bfd_und_section_ptr
;
4327 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4328 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4329 else if (isym
->st_shndx
== SHN_ABS
)
4330 isec
= bfd_abs_section_ptr
;
4331 else if (isym
->st_shndx
== SHN_COMMON
)
4332 isec
= bfd_com_section_ptr
;
4341 /* Don't output the first, undefined, symbol. */
4342 if (esym
== external_syms
)
4345 /* If we are stripping all symbols, we don't want to output this
4347 if (finfo
->info
->strip
== strip_all
)
4350 /* We never output section symbols. Instead, we use the section
4351 symbol of the corresponding section in the output file. */
4352 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4355 /* If we are discarding all local symbols, we don't want to
4356 output this one. If we are generating a relocateable output
4357 file, then some of the local symbols may be required by
4358 relocs; we output them below as we discover that they are
4360 if (finfo
->info
->discard
== discard_all
)
4363 /* If this symbol is defined in a section which we are
4364 discarding, we don't need to keep it, but note that
4365 linker_mark is only reliable for sections that have contents.
4366 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4367 as well as linker_mark. */
4368 if (isym
->st_shndx
> 0
4369 && isym
->st_shndx
< SHN_LORESERVE
4371 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4372 || (! finfo
->info
->relocateable
4373 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4376 /* Get the name of the symbol. */
4377 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4382 /* See if we are discarding symbols with this name. */
4383 if ((finfo
->info
->strip
== strip_some
4384 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4386 || (finfo
->info
->discard
== discard_l
4387 && bfd_is_local_label_name (input_bfd
, name
)))
4390 /* If we get here, we are going to output this symbol. */
4394 /* Adjust the section index for the output file. */
4395 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4396 isec
->output_section
);
4397 if (osym
.st_shndx
== (unsigned short) -1)
4400 *pindex
= output_bfd
->symcount
;
4402 /* ELF symbols in relocateable files are section relative, but
4403 in executable files they are virtual addresses. Note that
4404 this code assumes that all ELF sections have an associated
4405 BFD section with a reasonable value for output_offset; below
4406 we assume that they also have a reasonable value for
4407 output_section. Any special sections must be set up to meet
4408 these requirements. */
4409 osym
.st_value
+= isec
->output_offset
;
4410 if (! finfo
->info
->relocateable
)
4411 osym
.st_value
+= isec
->output_section
->vma
;
4413 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4417 /* Relocate the contents of each section. */
4418 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4422 if (! o
->linker_mark
)
4424 /* This section was omitted from the link. */
4428 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4429 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4432 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4434 /* Section was created by elf_link_create_dynamic_sections
4439 /* Get the contents of the section. They have been cached by a
4440 relaxation routine. Note that o is a section in an input
4441 file, so the contents field will not have been set by any of
4442 the routines which work on output files. */
4443 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4444 contents
= elf_section_data (o
)->this_hdr
.contents
;
4447 contents
= finfo
->contents
;
4448 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4449 (file_ptr
) 0, o
->_raw_size
))
4453 if ((o
->flags
& SEC_RELOC
) != 0)
4455 Elf_Internal_Rela
*internal_relocs
;
4457 /* Get the swapped relocs. */
4458 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4459 (input_bfd
, o
, finfo
->external_relocs
,
4460 finfo
->internal_relocs
, false));
4461 if (internal_relocs
== NULL
4462 && o
->reloc_count
> 0)
4465 /* Relocate the section by invoking a back end routine.
4467 The back end routine is responsible for adjusting the
4468 section contents as necessary, and (if using Rela relocs
4469 and generating a relocateable output file) adjusting the
4470 reloc addend as necessary.
4472 The back end routine does not have to worry about setting
4473 the reloc address or the reloc symbol index.
4475 The back end routine is given a pointer to the swapped in
4476 internal symbols, and can access the hash table entries
4477 for the external symbols via elf_sym_hashes (input_bfd).
4479 When generating relocateable output, the back end routine
4480 must handle STB_LOCAL/STT_SECTION symbols specially. The
4481 output symbol is going to be a section symbol
4482 corresponding to the output section, which will require
4483 the addend to be adjusted. */
4485 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4486 input_bfd
, o
, contents
,
4488 finfo
->internal_syms
,
4492 if (finfo
->info
->relocateable
)
4494 Elf_Internal_Rela
*irela
;
4495 Elf_Internal_Rela
*irelaend
;
4496 struct elf_link_hash_entry
**rel_hash
;
4497 Elf_Internal_Shdr
*input_rel_hdr
;
4498 Elf_Internal_Shdr
*output_rel_hdr
;
4500 /* Adjust the reloc addresses and symbol indices. */
4502 irela
= internal_relocs
;
4503 irelaend
= irela
+ o
->reloc_count
;
4504 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4505 + o
->output_section
->reloc_count
);
4506 for (; irela
< irelaend
; irela
++, rel_hash
++)
4508 unsigned long r_symndx
;
4509 Elf_Internal_Sym
*isym
;
4512 irela
->r_offset
+= o
->output_offset
;
4514 r_symndx
= ELF_R_SYM (irela
->r_info
);
4519 if (r_symndx
>= locsymcount
4520 || (elf_bad_symtab (input_bfd
)
4521 && finfo
->sections
[r_symndx
] == NULL
))
4525 /* This is a reloc against a global symbol. We
4526 have not yet output all the local symbols, so
4527 we do not know the symbol index of any global
4528 symbol. We set the rel_hash entry for this
4529 reloc to point to the global hash table entry
4530 for this symbol. The symbol index is then
4531 set at the end of elf_bfd_final_link. */
4532 indx
= r_symndx
- extsymoff
;
4533 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
4535 /* Setting the index to -2 tells
4536 elf_link_output_extsym that this symbol is
4538 BFD_ASSERT ((*rel_hash
)->indx
< 0);
4539 (*rel_hash
)->indx
= -2;
4544 /* This is a reloc against a local symbol. */
4547 isym
= finfo
->internal_syms
+ r_symndx
;
4548 sec
= finfo
->sections
[r_symndx
];
4549 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4551 /* I suppose the backend ought to fill in the
4552 section of any STT_SECTION symbol against a
4553 processor specific section. If we have
4554 discarded a section, the output_section will
4555 be the absolute section. */
4557 && (bfd_is_abs_section (sec
)
4558 || (sec
->output_section
!= NULL
4559 && bfd_is_abs_section (sec
->output_section
))))
4561 else if (sec
== NULL
|| sec
->owner
== NULL
)
4563 bfd_set_error (bfd_error_bad_value
);
4568 r_symndx
= sec
->output_section
->target_index
;
4569 BFD_ASSERT (r_symndx
!= 0);
4574 if (finfo
->indices
[r_symndx
] == -1)
4580 if (finfo
->info
->strip
== strip_all
)
4582 /* You can't do ld -r -s. */
4583 bfd_set_error (bfd_error_invalid_operation
);
4587 /* This symbol was skipped earlier, but
4588 since it is needed by a reloc, we
4589 must output it now. */
4590 link
= symtab_hdr
->sh_link
;
4591 name
= bfd_elf_string_from_elf_section (input_bfd
,
4597 osec
= sec
->output_section
;
4599 _bfd_elf_section_from_bfd_section (output_bfd
,
4601 if (isym
->st_shndx
== (unsigned short) -1)
4604 isym
->st_value
+= sec
->output_offset
;
4605 if (! finfo
->info
->relocateable
)
4606 isym
->st_value
+= osec
->vma
;
4608 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4610 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4614 r_symndx
= finfo
->indices
[r_symndx
];
4617 irela
->r_info
= ELF_R_INFO (r_symndx
,
4618 ELF_R_TYPE (irela
->r_info
));
4621 /* Swap out the relocs. */
4622 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4623 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4624 BFD_ASSERT (output_rel_hdr
->sh_entsize
4625 == input_rel_hdr
->sh_entsize
);
4626 irela
= internal_relocs
;
4627 irelaend
= irela
+ o
->reloc_count
;
4628 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4630 Elf_External_Rel
*erel
;
4632 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4633 + o
->output_section
->reloc_count
);
4634 for (; irela
< irelaend
; irela
++, erel
++)
4636 Elf_Internal_Rel irel
;
4638 irel
.r_offset
= irela
->r_offset
;
4639 irel
.r_info
= irela
->r_info
;
4640 BFD_ASSERT (irela
->r_addend
== 0);
4641 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4646 Elf_External_Rela
*erela
;
4648 BFD_ASSERT (input_rel_hdr
->sh_entsize
4649 == sizeof (Elf_External_Rela
));
4650 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4651 + o
->output_section
->reloc_count
);
4652 for (; irela
< irelaend
; irela
++, erela
++)
4653 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4656 o
->output_section
->reloc_count
+= o
->reloc_count
;
4660 /* Write out the modified section contents. */
4661 if (elf_section_data (o
)->stab_info
== NULL
)
4663 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
4664 contents
, o
->output_offset
,
4665 (o
->_cooked_size
!= 0
4672 if (! (_bfd_write_section_stabs
4673 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4674 o
, &elf_section_data (o
)->stab_info
, contents
)))
4682 /* Generate a reloc when linking an ELF file. This is a reloc
4683 requested by the linker, and does come from any input file. This
4684 is used to build constructor and destructor tables when linking
4688 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4690 struct bfd_link_info
*info
;
4691 asection
*output_section
;
4692 struct bfd_link_order
*link_order
;
4694 reloc_howto_type
*howto
;
4698 struct elf_link_hash_entry
**rel_hash_ptr
;
4699 Elf_Internal_Shdr
*rel_hdr
;
4701 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4704 bfd_set_error (bfd_error_bad_value
);
4708 addend
= link_order
->u
.reloc
.p
->addend
;
4710 /* Figure out the symbol index. */
4711 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4712 + output_section
->reloc_count
);
4713 if (link_order
->type
== bfd_section_reloc_link_order
)
4715 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4716 BFD_ASSERT (indx
!= 0);
4717 *rel_hash_ptr
= NULL
;
4721 struct elf_link_hash_entry
*h
;
4723 /* Treat a reloc against a defined symbol as though it were
4724 actually against the section. */
4725 h
= ((struct elf_link_hash_entry
*)
4726 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4727 link_order
->u
.reloc
.p
->u
.name
,
4728 false, false, true));
4730 && (h
->root
.type
== bfd_link_hash_defined
4731 || h
->root
.type
== bfd_link_hash_defweak
))
4735 section
= h
->root
.u
.def
.section
;
4736 indx
= section
->output_section
->target_index
;
4737 *rel_hash_ptr
= NULL
;
4738 /* It seems that we ought to add the symbol value to the
4739 addend here, but in practice it has already been added
4740 because it was passed to constructor_callback. */
4741 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4745 /* Setting the index to -2 tells elf_link_output_extsym that
4746 this symbol is used by a reloc. */
4753 if (! ((*info
->callbacks
->unattached_reloc
)
4754 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
4755 (asection
*) NULL
, (bfd_vma
) 0)))
4761 /* If this is an inplace reloc, we must write the addend into the
4763 if (howto
->partial_inplace
&& addend
!= 0)
4766 bfd_reloc_status_type rstat
;
4770 size
= bfd_get_reloc_size (howto
);
4771 buf
= (bfd_byte
*) bfd_zmalloc (size
);
4772 if (buf
== (bfd_byte
*) NULL
)
4774 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
4780 case bfd_reloc_outofrange
:
4782 case bfd_reloc_overflow
:
4783 if (! ((*info
->callbacks
->reloc_overflow
)
4785 (link_order
->type
== bfd_section_reloc_link_order
4786 ? bfd_section_name (output_bfd
,
4787 link_order
->u
.reloc
.p
->u
.section
)
4788 : link_order
->u
.reloc
.p
->u
.name
),
4789 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
4797 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
4798 (file_ptr
) link_order
->offset
, size
);
4804 /* The address of a reloc is relative to the section in a
4805 relocateable file, and is a virtual address in an executable
4807 offset
= link_order
->offset
;
4808 if (! info
->relocateable
)
4809 offset
+= output_section
->vma
;
4811 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
4813 if (rel_hdr
->sh_type
== SHT_REL
)
4815 Elf_Internal_Rel irel
;
4816 Elf_External_Rel
*erel
;
4818 irel
.r_offset
= offset
;
4819 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
4820 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
4821 + output_section
->reloc_count
);
4822 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4826 Elf_Internal_Rela irela
;
4827 Elf_External_Rela
*erela
;
4829 irela
.r_offset
= offset
;
4830 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
4831 irela
.r_addend
= addend
;
4832 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
4833 + output_section
->reloc_count
);
4834 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
4837 ++output_section
->reloc_count
;
4843 /* Allocate a pointer to live in a linker created section. */
4846 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
4848 struct bfd_link_info
*info
;
4849 elf_linker_section_t
*lsect
;
4850 struct elf_link_hash_entry
*h
;
4851 const Elf_Internal_Rela
*rel
;
4853 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
4854 elf_linker_section_pointers_t
*linker_section_ptr
;
4855 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
4857 BFD_ASSERT (lsect
!= NULL
);
4859 /* Is this a global symbol? */
4862 /* Has this symbol already been allocated, if so, our work is done */
4863 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
4868 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
4869 /* Make sure this symbol is output as a dynamic symbol. */
4870 if (h
->dynindx
== -1)
4872 if (! elf_link_record_dynamic_symbol (info
, h
))
4876 if (lsect
->rel_section
)
4877 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
4880 else /* Allocation of a pointer to a local symbol */
4882 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
4884 /* Allocate a table to hold the local symbols if first time */
4887 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
4888 register unsigned int i
;
4890 ptr
= (elf_linker_section_pointers_t
**)
4891 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
4896 elf_local_ptr_offsets (abfd
) = ptr
;
4897 for (i
= 0; i
< num_symbols
; i
++)
4898 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
4901 /* Has this symbol already been allocated, if so, our work is done */
4902 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
4907 ptr_linker_section_ptr
= &ptr
[r_symndx
];
4911 /* If we are generating a shared object, we need to
4912 output a R_<xxx>_RELATIVE reloc so that the
4913 dynamic linker can adjust this GOT entry. */
4914 BFD_ASSERT (lsect
->rel_section
!= NULL
);
4915 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
4919 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
4920 from internal memory. */
4921 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
4922 linker_section_ptr
= (elf_linker_section_pointers_t
*)
4923 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
4925 if (!linker_section_ptr
)
4928 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
4929 linker_section_ptr
->addend
= rel
->r_addend
;
4930 linker_section_ptr
->which
= lsect
->which
;
4931 linker_section_ptr
->written_address_p
= false;
4932 *ptr_linker_section_ptr
= linker_section_ptr
;
4935 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
4937 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
4938 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
4939 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
4940 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
4942 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
4944 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
4945 lsect
->sym_hash
->root
.root
.string
,
4946 (long)ARCH_SIZE
/ 8,
4947 (long)lsect
->sym_hash
->root
.u
.def
.value
);
4953 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
4955 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
4958 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
4959 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
4967 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
4970 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
4973 /* Fill in the address for a pointer generated in alinker section. */
4976 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
4979 struct bfd_link_info
*info
;
4980 elf_linker_section_t
*lsect
;
4981 struct elf_link_hash_entry
*h
;
4983 const Elf_Internal_Rela
*rel
;
4986 elf_linker_section_pointers_t
*linker_section_ptr
;
4988 BFD_ASSERT (lsect
!= NULL
);
4990 if (h
!= NULL
) /* global symbol */
4992 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
4996 BFD_ASSERT (linker_section_ptr
!= NULL
);
4998 if (! elf_hash_table (info
)->dynamic_sections_created
5001 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5003 /* This is actually a static link, or it is a
5004 -Bsymbolic link and the symbol is defined
5005 locally. We must initialize this entry in the
5008 When doing a dynamic link, we create a .rela.<xxx>
5009 relocation entry to initialize the value. This
5010 is done in the finish_dynamic_symbol routine. */
5011 if (!linker_section_ptr
->written_address_p
)
5013 linker_section_ptr
->written_address_p
= true;
5014 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5015 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5019 else /* local symbol */
5021 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5022 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5023 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5024 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5028 BFD_ASSERT (linker_section_ptr
!= NULL
);
5030 /* Write out pointer if it hasn't been rewritten out before */
5031 if (!linker_section_ptr
->written_address_p
)
5033 linker_section_ptr
->written_address_p
= true;
5034 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5035 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5039 asection
*srel
= lsect
->rel_section
;
5040 Elf_Internal_Rela outrel
;
5042 /* We need to generate a relative reloc for the dynamic linker. */
5044 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5047 BFD_ASSERT (srel
!= NULL
);
5049 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5050 + lsect
->section
->output_offset
5051 + linker_section_ptr
->offset
);
5052 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5053 outrel
.r_addend
= 0;
5054 elf_swap_reloca_out (output_bfd
, &outrel
,
5055 (((Elf_External_Rela
*)
5056 lsect
->section
->contents
)
5057 + lsect
->section
->reloc_count
));
5058 ++lsect
->section
->reloc_count
;
5063 relocation
= (lsect
->section
->output_offset
5064 + linker_section_ptr
->offset
5065 - lsect
->hole_offset
5066 - lsect
->sym_offset
);
5069 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5070 lsect
->name
, (long)relocation
, (long)relocation
);
5073 /* Subtract out the addend, because it will get added back in by the normal
5075 return relocation
- linker_section_ptr
->addend
;