2
Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3
Free Software Foundation, Inc.
5
This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* ELF linker code. */
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/* This struct is used to pass information to routines called via
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elf_link_hash_traverse which must return failure. */
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struct elf_info_failed
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struct bfd_link_info *info;
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struct bfd_elf_version_tree *verdefs;
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static boolean is_global_data_symbol_definition
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PARAMS ((bfd *, Elf_Internal_Sym *));
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static boolean elf_link_is_defined_archive_symbol
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PARAMS ((bfd *, carsym *));
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static boolean elf_link_add_object_symbols
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PARAMS ((bfd *, struct bfd_link_info *));
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static boolean elf_link_add_archive_symbols
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PARAMS ((bfd *, struct bfd_link_info *));
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static boolean elf_merge_symbol
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PARAMS ((bfd *, struct bfd_link_info *, const char *,
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Elf_Internal_Sym *, asection **, bfd_vma *,
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struct elf_link_hash_entry **, boolean *, boolean *,
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static boolean elf_add_default_symbol
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PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
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const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
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boolean *, boolean, boolean));
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static boolean elf_export_symbol
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PARAMS ((struct elf_link_hash_entry *, PTR));
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static boolean elf_finalize_dynstr
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PARAMS ((bfd *, struct bfd_link_info *));
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static boolean elf_fix_symbol_flags
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PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *));
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static boolean elf_adjust_dynamic_symbol
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PARAMS ((struct elf_link_hash_entry *, PTR));
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static boolean elf_link_find_version_dependencies
59
PARAMS ((struct elf_link_hash_entry *, PTR));
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static boolean elf_link_assign_sym_version
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PARAMS ((struct elf_link_hash_entry *, PTR));
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static boolean elf_collect_hash_codes
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PARAMS ((struct elf_link_hash_entry *, PTR));
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static boolean elf_link_read_relocs_from_section
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PARAMS ((bfd *, Elf_Internal_Shdr *, PTR, Elf_Internal_Rela *));
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static size_t compute_bucket_count
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PARAMS ((struct bfd_link_info *));
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static boolean elf_link_output_relocs
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PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *));
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static boolean elf_link_size_reloc_section
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PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
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static void elf_link_adjust_relocs
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PARAMS ((bfd *, Elf_Internal_Shdr *, unsigned int,
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struct elf_link_hash_entry **));
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static int elf_link_sort_cmp1
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PARAMS ((const void *, const void *));
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static int elf_link_sort_cmp2
78
PARAMS ((const void *, const void *));
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static size_t elf_link_sort_relocs
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PARAMS ((bfd *, struct bfd_link_info *, asection **));
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static boolean elf_section_ignore_discarded_relocs
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PARAMS ((asection *));
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/* Given an ELF BFD, add symbols to the global hash table as
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elf_bfd_link_add_symbols (abfd, info)
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struct bfd_link_info *info;
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switch (bfd_get_format (abfd))
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return elf_link_add_object_symbols (abfd, info);
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return elf_link_add_archive_symbols (abfd, info);
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bfd_set_error (bfd_error_wrong_format);
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/* Return true iff this is a non-common, definition of a non-function symbol. */
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is_global_data_symbol_definition (abfd, sym)
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bfd * abfd ATTRIBUTE_UNUSED;
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Elf_Internal_Sym * sym;
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/* Local symbols do not count, but target specific ones might. */
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if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
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&& ELF_ST_BIND (sym->st_info) < STB_LOOS)
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/* Function symbols do not count. */
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if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
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/* If the section is undefined, then so is the symbol. */
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if (sym->st_shndx == SHN_UNDEF)
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/* If the symbol is defined in the common section, then
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it is a common definition and so does not count. */
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if (sym->st_shndx == SHN_COMMON)
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/* If the symbol is in a target specific section then we
129
must rely upon the backend to tell us what it is. */
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if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
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/* FIXME - this function is not coded yet:
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return _bfd_is_global_symbol_definition (abfd, sym);
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Instead for now assume that the definition is not global,
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Even if this is wrong, at least the linker will behave
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in the same way that it used to do. */
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/* Search the symbol table of the archive element of the archive ABFD
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whose archive map contains a mention of SYMDEF, and determine if
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the symbol is defined in this element. */
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elf_link_is_defined_archive_symbol (abfd, symdef)
151
Elf_Internal_Shdr * hdr;
152
bfd_size_type symcount;
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bfd_size_type extsymcount;
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bfd_size_type extsymoff;
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Elf_Internal_Sym *isymbuf;
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Elf_Internal_Sym *isym;
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Elf_Internal_Sym *isymend;
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abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
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if (abfd == (bfd *) NULL)
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if (! bfd_check_format (abfd, bfd_object))
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/* If we have already included the element containing this symbol in the
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link then we do not need to include it again. Just claim that any symbol
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it contains is not a definition, so that our caller will not decide to
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(re)include this element. */
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if (abfd->archive_pass)
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/* Select the appropriate symbol table. */
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if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
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hdr = &elf_tdata (abfd)->symtab_hdr;
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hdr = &elf_tdata (abfd)->dynsymtab_hdr;
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symcount = hdr->sh_size / sizeof (Elf_External_Sym);
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/* The sh_info field of the symtab header tells us where the
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external symbols start. We don't care about the local symbols. */
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if (elf_bad_symtab (abfd))
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extsymcount = symcount;
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extsymcount = symcount - hdr->sh_info;
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extsymoff = hdr->sh_info;
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if (extsymcount == 0)
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/* Read in the symbol table. */
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isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
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/* Scan the symbol table looking for SYMDEF. */
206
for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
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name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
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if (name == (const char *) NULL)
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if (strcmp (name, symdef->name) == 0)
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result = is_global_data_symbol_definition (abfd, isym);
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/* Add symbols from an ELF archive file to the linker hash table. We
228
don't use _bfd_generic_link_add_archive_symbols because of a
229
problem which arises on UnixWare. The UnixWare libc.so is an
230
archive which includes an entry libc.so.1 which defines a bunch of
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symbols. The libc.so archive also includes a number of other
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object files, which also define symbols, some of which are the same
233
as those defined in libc.so.1. Correct linking requires that we
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consider each object file in turn, and include it if it defines any
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symbols we need. _bfd_generic_link_add_archive_symbols does not do
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this; it looks through the list of undefined symbols, and includes
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any object file which defines them. When this algorithm is used on
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UnixWare, it winds up pulling in libc.so.1 early and defining a
239
bunch of symbols. This means that some of the other objects in the
240
archive are not included in the link, which is incorrect since they
241
precede libc.so.1 in the archive.
243
Fortunately, ELF archive handling is simpler than that done by
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_bfd_generic_link_add_archive_symbols, which has to allow for a.out
245
oddities. In ELF, if we find a symbol in the archive map, and the
246
symbol is currently undefined, we know that we must pull in that
249
Unfortunately, we do have to make multiple passes over the symbol
250
table until nothing further is resolved. */
253
elf_link_add_archive_symbols (abfd, info)
255
struct bfd_link_info *info;
258
boolean *defined = NULL;
259
boolean *included = NULL;
264
if (! bfd_has_map (abfd))
266
/* An empty archive is a special case. */
267
if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
269
bfd_set_error (bfd_error_no_armap);
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/* Keep track of all symbols we know to be already defined, and all
274
files we know to be already included. This is to speed up the
275
second and subsequent passes. */
276
c = bfd_ardata (abfd)->symdef_count;
280
amt *= sizeof (boolean);
281
defined = (boolean *) bfd_zmalloc (amt);
282
included = (boolean *) bfd_zmalloc (amt);
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if (defined == (boolean *) NULL || included == (boolean *) NULL)
286
symdefs = bfd_ardata (abfd)->symdefs;
299
symdefend = symdef + c;
300
for (i = 0; symdef < symdefend; symdef++, i++)
302
struct elf_link_hash_entry *h;
304
struct bfd_link_hash_entry *undefs_tail;
307
if (defined[i] || included[i])
309
if (symdef->file_offset == last)
315
h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
316
false, false, false);
323
/* If this is a default version (the name contains @@),
324
look up the symbol again with only one `@' as well
325
as without the version. The effect is that references
326
to the symbol with and without the version will be
327
matched by the default symbol in the archive. */
329
p = strchr (symdef->name, ELF_VER_CHR);
330
if (p == NULL || p[1] != ELF_VER_CHR)
333
/* First check with only one `@'. */
334
len = strlen (symdef->name);
335
copy = bfd_alloc (abfd, (bfd_size_type) len);
338
first = p - symdef->name + 1;
339
memcpy (copy, symdef->name, first);
340
memcpy (copy + first, symdef->name + first + 1, len - first);
342
h = elf_link_hash_lookup (elf_hash_table (info), copy,
343
false, false, false);
347
/* We also need to check references to the symbol
348
without the version. */
350
copy[first - 1] = '\0';
351
h = elf_link_hash_lookup (elf_hash_table (info),
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copy, false, false, false);
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bfd_release (abfd, copy);
361
if (h->root.type == bfd_link_hash_common)
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/* We currently have a common symbol. The archive map contains
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a reference to this symbol, so we may want to include it. We
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only want to include it however, if this archive element
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contains a definition of the symbol, not just another common
369
Unfortunately some archivers (including GNU ar) will put
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declarations of common symbols into their archive maps, as
371
well as real definitions, so we cannot just go by the archive
372
map alone. Instead we must read in the element's symbol
373
table and check that to see what kind of symbol definition
375
if (! elf_link_is_defined_archive_symbol (abfd, symdef))
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else if (h->root.type != bfd_link_hash_undefined)
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if (h->root.type != bfd_link_hash_undefweak)
385
/* We need to include this archive member. */
386
element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
387
if (element == (bfd *) NULL)
390
if (! bfd_check_format (element, bfd_object))
393
/* Doublecheck that we have not included this object
394
already--it should be impossible, but there may be
395
something wrong with the archive. */
396
if (element->archive_pass != 0)
398
bfd_set_error (bfd_error_bad_value);
401
element->archive_pass = 1;
403
undefs_tail = info->hash->undefs_tail;
405
if (! (*info->callbacks->add_archive_element) (info, element,
408
if (! elf_link_add_object_symbols (element, info))
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/* If there are any new undefined symbols, we need to make
412
another pass through the archive in order to see whether
413
they can be defined. FIXME: This isn't perfect, because
414
common symbols wind up on undefs_tail and because an
415
undefined symbol which is defined later on in this pass
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does not require another pass. This isn't a bug, but it
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does make the code less efficient than it could be. */
418
if (undefs_tail != info->hash->undefs_tail)
421
/* Look backward to mark all symbols from this object file
422
which we have already seen in this pass. */
426
included[mark] = true;
431
while (symdefs[mark].file_offset == symdef->file_offset);
433
/* We mark subsequent symbols from this object file as we go
434
on through the loop. */
435
last = symdef->file_offset;
446
if (defined != (boolean *) NULL)
448
if (included != (boolean *) NULL)
453
/* This function is called when we want to define a new symbol. It
454
handles the various cases which arise when we find a definition in
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a dynamic object, or when there is already a definition in a
456
dynamic object. The new symbol is described by NAME, SYM, PSEC,
457
and PVALUE. We set SYM_HASH to the hash table entry. We set
458
OVERRIDE if the old symbol is overriding a new definition. We set
459
TYPE_CHANGE_OK if it is OK for the type to change. We set
460
SIZE_CHANGE_OK if it is OK for the size to change. By OK to
461
change, we mean that we shouldn't warn if the type or size does
462
change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
466
elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash,
467
override, type_change_ok, size_change_ok, dt_needed)
469
struct bfd_link_info *info;
471
Elf_Internal_Sym *sym;
474
struct elf_link_hash_entry **sym_hash;
476
boolean *type_change_ok;
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boolean *size_change_ok;
481
struct elf_link_hash_entry *h;
484
boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
489
bind = ELF_ST_BIND (sym->st_info);
491
if (! bfd_is_und_section (sec))
492
h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false);
494
h = ((struct elf_link_hash_entry *)
495
bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false));
500
/* This code is for coping with dynamic objects, and is only useful
501
if we are doing an ELF link. */
502
if (info->hash->creator != abfd->xvec)
505
/* For merging, we only care about real symbols. */
507
while (h->root.type == bfd_link_hash_indirect
508
|| h->root.type == bfd_link_hash_warning)
509
h = (struct elf_link_hash_entry *) h->root.u.i.link;
511
/* If we just created the symbol, mark it as being an ELF symbol.
512
Other than that, there is nothing to do--there is no merge issue
513
with a newly defined symbol--so we just return. */
515
if (h->root.type == bfd_link_hash_new)
517
h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
521
/* OLDBFD is a BFD associated with the existing symbol. */
523
switch (h->root.type)
529
case bfd_link_hash_undefined:
530
case bfd_link_hash_undefweak:
531
oldbfd = h->root.u.undef.abfd;
534
case bfd_link_hash_defined:
535
case bfd_link_hash_defweak:
536
oldbfd = h->root.u.def.section->owner;
539
case bfd_link_hash_common:
540
oldbfd = h->root.u.c.p->section->owner;
544
/* In cases involving weak versioned symbols, we may wind up trying
545
to merge a symbol with itself. Catch that here, to avoid the
546
confusion that results if we try to override a symbol with
547
itself. The additional tests catch cases like
548
_GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
549
dynamic object, which we do want to handle here. */
551
&& ((abfd->flags & DYNAMIC) == 0
552
|| (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))
555
/* NEWDYN and OLDDYN indicate whether the new or old symbol,
556
respectively, is from a dynamic object. */
558
if ((abfd->flags & DYNAMIC) != 0)
564
olddyn = (oldbfd->flags & DYNAMIC) != 0;
569
/* This code handles the special SHN_MIPS_{TEXT,DATA} section
570
indices used by MIPS ELF. */
571
switch (h->root.type)
577
case bfd_link_hash_defined:
578
case bfd_link_hash_defweak:
579
hsec = h->root.u.def.section;
582
case bfd_link_hash_common:
583
hsec = h->root.u.c.p->section;
590
olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0;
593
/* NEWDEF and OLDDEF indicate whether the new or old symbol,
594
respectively, appear to be a definition rather than reference. */
596
if (bfd_is_und_section (sec) || bfd_is_com_section (sec))
601
if (h->root.type == bfd_link_hash_undefined
602
|| h->root.type == bfd_link_hash_undefweak
603
|| h->root.type == bfd_link_hash_common)
608
/* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
609
symbol, respectively, appears to be a common symbol in a dynamic
610
object. If a symbol appears in an uninitialized section, and is
611
not weak, and is not a function, then it may be a common symbol
612
which was resolved when the dynamic object was created. We want
613
to treat such symbols specially, because they raise special
614
considerations when setting the symbol size: if the symbol
615
appears as a common symbol in a regular object, and the size in
616
the regular object is larger, we must make sure that we use the
617
larger size. This problematic case can always be avoided in C,
618
but it must be handled correctly when using Fortran shared
621
Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
622
likewise for OLDDYNCOMMON and OLDDEF.
624
Note that this test is just a heuristic, and that it is quite
625
possible to have an uninitialized symbol in a shared object which
626
is really a definition, rather than a common symbol. This could
627
lead to some minor confusion when the symbol really is a common
628
symbol in some regular object. However, I think it will be
633
&& (sec->flags & SEC_ALLOC) != 0
634
&& (sec->flags & SEC_LOAD) == 0
637
&& ELF_ST_TYPE (sym->st_info) != STT_FUNC)
640
newdyncommon = false;
644
&& h->root.type == bfd_link_hash_defined
645
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
646
&& (h->root.u.def.section->flags & SEC_ALLOC) != 0
647
&& (h->root.u.def.section->flags & SEC_LOAD) == 0
649
&& h->type != STT_FUNC)
652
olddyncommon = false;
654
/* It's OK to change the type if either the existing symbol or the
655
new symbol is weak unless it comes from a DT_NEEDED entry of
656
a shared object, in which case, the DT_NEEDED entry may not be
657
required at the run time. */
659
if ((! dt_needed && h->root.type == bfd_link_hash_defweak)
660
|| h->root.type == bfd_link_hash_undefweak
662
*type_change_ok = true;
664
/* It's OK to change the size if either the existing symbol or the
665
new symbol is weak, or if the old symbol is undefined. */
668
|| h->root.type == bfd_link_hash_undefined)
669
*size_change_ok = true;
671
/* If both the old and the new symbols look like common symbols in a
672
dynamic object, set the size of the symbol to the larger of the
677
&& sym->st_size != h->size)
679
/* Since we think we have two common symbols, issue a multiple
680
common warning if desired. Note that we only warn if the
681
size is different. If the size is the same, we simply let
682
the old symbol override the new one as normally happens with
683
symbols defined in dynamic objects. */
685
if (! ((*info->callbacks->multiple_common)
686
(info, h->root.root.string, oldbfd, bfd_link_hash_common,
687
h->size, abfd, bfd_link_hash_common, sym->st_size)))
690
if (sym->st_size > h->size)
691
h->size = sym->st_size;
693
*size_change_ok = true;
696
/* If we are looking at a dynamic object, and we have found a
697
definition, we need to see if the symbol was already defined by
698
some other object. If so, we want to use the existing
699
definition, and we do not want to report a multiple symbol
700
definition error; we do this by clobbering *PSEC to be
703
We treat a common symbol as a definition if the symbol in the
704
shared library is a function, since common symbols always
705
represent variables; this can cause confusion in principle, but
706
any such confusion would seem to indicate an erroneous program or
707
shared library. We also permit a common symbol in a regular
708
object to override a weak symbol in a shared object.
710
We prefer a non-weak definition in a shared library to a weak
711
definition in the executable unless it comes from a DT_NEEDED
712
entry of a shared object, in which case, the DT_NEEDED entry
713
may not be required at the run time. */
718
|| (h->root.type == bfd_link_hash_common
720
|| ELF_ST_TYPE (sym->st_info) == STT_FUNC)))
721
&& (h->root.type != bfd_link_hash_defweak
723
|| bind == STB_WEAK))
727
newdyncommon = false;
729
*psec = sec = bfd_und_section_ptr;
730
*size_change_ok = true;
732
/* If we get here when the old symbol is a common symbol, then
733
we are explicitly letting it override a weak symbol or
734
function in a dynamic object, and we don't want to warn about
735
a type change. If the old symbol is a defined symbol, a type
736
change warning may still be appropriate. */
738
if (h->root.type == bfd_link_hash_common)
739
*type_change_ok = true;
742
/* Handle the special case of an old common symbol merging with a
743
new symbol which looks like a common symbol in a shared object.
744
We change *PSEC and *PVALUE to make the new symbol look like a
745
common symbol, and let _bfd_generic_link_add_one_symbol will do
749
&& h->root.type == bfd_link_hash_common)
753
newdyncommon = false;
754
*pvalue = sym->st_size;
755
*psec = sec = bfd_com_section_ptr;
756
*size_change_ok = true;
759
/* If the old symbol is from a dynamic object, and the new symbol is
760
a definition which is not from a dynamic object, then the new
761
symbol overrides the old symbol. Symbols from regular files
762
always take precedence over symbols from dynamic objects, even if
763
they are defined after the dynamic object in the link.
765
As above, we again permit a common symbol in a regular object to
766
override a definition in a shared object if the shared object
767
symbol is a function or is weak.
769
As above, we permit a non-weak definition in a shared object to
770
override a weak definition in a regular object. */
774
|| (bfd_is_com_section (sec)
775
&& (h->root.type == bfd_link_hash_defweak
776
|| h->type == STT_FUNC)))
779
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
781
|| h->root.type == bfd_link_hash_defweak))
783
/* Change the hash table entry to undefined, and let
784
_bfd_generic_link_add_one_symbol do the right thing with the
787
h->root.type = bfd_link_hash_undefined;
788
h->root.u.undef.abfd = h->root.u.def.section->owner;
789
*size_change_ok = true;
792
olddyncommon = false;
794
/* We again permit a type change when a common symbol may be
795
overriding a function. */
797
if (bfd_is_com_section (sec))
798
*type_change_ok = true;
800
/* This union may have been set to be non-NULL when this symbol
801
was seen in a dynamic object. We must force the union to be
802
NULL, so that it is correct for a regular symbol. */
804
h->verinfo.vertree = NULL;
806
/* In this special case, if H is the target of an indirection,
807
we want the caller to frob with H rather than with the
808
indirect symbol. That will permit the caller to redefine the
809
target of the indirection, rather than the indirect symbol
810
itself. FIXME: This will break the -y option if we store a
811
symbol with a different name. */
815
/* Handle the special case of a new common symbol merging with an
816
old symbol that looks like it might be a common symbol defined in
817
a shared object. Note that we have already handled the case in
818
which a new common symbol should simply override the definition
819
in the shared library. */
822
&& bfd_is_com_section (sec)
825
/* It would be best if we could set the hash table entry to a
826
common symbol, but we don't know what to use for the section
828
if (! ((*info->callbacks->multiple_common)
829
(info, h->root.root.string, oldbfd, bfd_link_hash_common,
830
h->size, abfd, bfd_link_hash_common, sym->st_size)))
833
/* If the predumed common symbol in the dynamic object is
834
larger, pretend that the new symbol has its size. */
836
if (h->size > *pvalue)
839
/* FIXME: We no longer know the alignment required by the symbol
840
in the dynamic object, so we just wind up using the one from
841
the regular object. */
844
olddyncommon = false;
846
h->root.type = bfd_link_hash_undefined;
847
h->root.u.undef.abfd = h->root.u.def.section->owner;
849
*size_change_ok = true;
850
*type_change_ok = true;
852
h->verinfo.vertree = NULL;
855
/* Handle the special case of a weak definition in a regular object
856
followed by a non-weak definition in a shared object. In this
857
case, we prefer the definition in the shared object unless it
858
comes from a DT_NEEDED entry of a shared object, in which case,
859
the DT_NEEDED entry may not be required at the run time. */
862
&& h->root.type == bfd_link_hash_defweak
867
/* To make this work we have to frob the flags so that the rest
868
of the code does not think we are using the regular
870
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
871
h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
872
else if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)
873
h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
874
h->elf_link_hash_flags &= ~ (ELF_LINK_HASH_DEF_REGULAR
875
| ELF_LINK_HASH_DEF_DYNAMIC);
877
/* If H is the target of an indirection, we want the caller to
878
use H rather than the indirect symbol. Otherwise if we are
879
defining a new indirect symbol we will wind up attaching it
880
to the entry we are overriding. */
884
/* Handle the special case of a non-weak definition in a shared
885
object followed by a weak definition in a regular object. In
886
this case we prefer to definition in the shared object. To make
887
this work we have to tell the caller to not treat the new symbol
891
&& h->root.type != bfd_link_hash_defweak
900
/* This function is called to create an indirect symbol from the
901
default for the symbol with the default version if needed. The
902
symbol is described by H, NAME, SYM, SEC, VALUE, and OVERRIDE. We
903
set DYNSYM if the new indirect symbol is dynamic. DT_NEEDED
904
indicates if it comes from a DT_NEEDED entry of a shared object. */
907
elf_add_default_symbol (abfd, info, h, name, sym, sec, value,
908
dynsym, override, dt_needed)
910
struct bfd_link_info *info;
911
struct elf_link_hash_entry *h;
913
Elf_Internal_Sym *sym;
920
boolean type_change_ok;
921
boolean size_change_ok;
923
struct elf_link_hash_entry *hi;
924
struct elf_backend_data *bed;
928
size_t len, shortlen;
930
/* If this symbol has a version, and it is the default version, we
931
create an indirect symbol from the default name to the fully
932
decorated name. This will cause external references which do not
933
specify a version to be bound to this version of the symbol. */
934
p = strchr (name, ELF_VER_CHR);
935
if (p == NULL || p[1] != ELF_VER_CHR)
940
/* We are overridden by an old defition. We need to check if we
941
need to create the indirect symbol from the default name. */
942
hi = elf_link_hash_lookup (elf_hash_table (info), name, true,
944
BFD_ASSERT (hi != NULL);
947
while (hi->root.type == bfd_link_hash_indirect
948
|| hi->root.type == bfd_link_hash_warning)
950
hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
956
bed = get_elf_backend_data (abfd);
957
collect = bed->collect;
958
dynamic = (abfd->flags & DYNAMIC) != 0;
961
shortname = bfd_hash_allocate (&info->hash->table, shortlen + 1);
962
if (shortname == NULL)
964
memcpy (shortname, name, shortlen);
965
shortname[shortlen] = '\0';
967
/* We are going to create a new symbol. Merge it with any existing
968
symbol with this name. For the purposes of the merge, act as
969
though we were defining the symbol we just defined, although we
970
actually going to define an indirect symbol. */
971
type_change_ok = false;
972
size_change_ok = false;
973
if (! elf_merge_symbol (abfd, info, shortname, sym, sec, value,
974
&hi, &override, &type_change_ok,
975
&size_change_ok, dt_needed))
980
if (! (_bfd_generic_link_add_one_symbol
981
(info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
982
(bfd_vma) 0, name, false, collect,
983
(struct bfd_link_hash_entry **) &hi)))
988
/* In this case the symbol named SHORTNAME is overriding the
989
indirect symbol we want to add. We were planning on making
990
SHORTNAME an indirect symbol referring to NAME. SHORTNAME
991
is the name without a version. NAME is the fully versioned
992
name, and it is the default version.
994
Overriding means that we already saw a definition for the
995
symbol SHORTNAME in a regular object, and it is overriding
996
the symbol defined in the dynamic object.
998
When this happens, we actually want to change NAME, the
999
symbol we just added, to refer to SHORTNAME. This will cause
1000
references to NAME in the shared object to become references
1001
to SHORTNAME in the regular object. This is what we expect
1002
when we override a function in a shared object: that the
1003
references in the shared object will be mapped to the
1004
definition in the regular object. */
1006
while (hi->root.type == bfd_link_hash_indirect
1007
|| hi->root.type == bfd_link_hash_warning)
1008
hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1010
h->root.type = bfd_link_hash_indirect;
1011
h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1012
if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC)
1014
h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC;
1015
hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
1016
if (hi->elf_link_hash_flags
1017
& (ELF_LINK_HASH_REF_REGULAR
1018
| ELF_LINK_HASH_DEF_REGULAR))
1020
if (! _bfd_elf_link_record_dynamic_symbol (info, hi))
1025
/* Now set HI to H, so that the following code will set the
1026
other fields correctly. */
1030
/* If there is a duplicate definition somewhere, then HI may not
1031
point to an indirect symbol. We will have reported an error to
1032
the user in that case. */
1034
if (hi->root.type == bfd_link_hash_indirect)
1036
struct elf_link_hash_entry *ht;
1038
/* If the symbol became indirect, then we assume that we have
1039
not seen a definition before. */
1040
BFD_ASSERT ((hi->elf_link_hash_flags
1041
& (ELF_LINK_HASH_DEF_DYNAMIC
1042
| ELF_LINK_HASH_DEF_REGULAR)) == 0);
1044
ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1045
(*bed->elf_backend_copy_indirect_symbol) (ht, hi);
1047
/* See if the new flags lead us to realize that the symbol must
1054
|| ((hi->elf_link_hash_flags
1055
& ELF_LINK_HASH_REF_DYNAMIC) != 0))
1060
if ((hi->elf_link_hash_flags
1061
& ELF_LINK_HASH_REF_REGULAR) != 0)
1067
/* We also need to define an indirection from the nondefault version
1070
len = strlen (name);
1071
shortname = bfd_hash_allocate (&info->hash->table, len);
1072
if (shortname == NULL)
1074
memcpy (shortname, name, shortlen);
1075
memcpy (shortname + shortlen, p + 1, len - shortlen);
1077
/* Once again, merge with any existing symbol. */
1078
type_change_ok = false;
1079
size_change_ok = false;
1080
if (! elf_merge_symbol (abfd, info, shortname, sym, sec, value,
1081
&hi, &override, &type_change_ok,
1082
&size_change_ok, dt_needed))
1087
/* Here SHORTNAME is a versioned name, so we don't expect to see
1088
the type of override we do in the case above. */
1089
(*_bfd_error_handler)
1090
(_("%s: warning: unexpected redefinition of `%s'"),
1091
bfd_archive_filename (abfd), shortname);
1095
if (! (_bfd_generic_link_add_one_symbol
1096
(info, abfd, shortname, BSF_INDIRECT,
1097
bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1098
collect, (struct bfd_link_hash_entry **) &hi)))
1101
/* If there is a duplicate definition somewhere, then HI may not
1102
point to an indirect symbol. We will have reported an error
1103
to the user in that case. */
1105
if (hi->root.type == bfd_link_hash_indirect)
1107
/* If the symbol became indirect, then we assume that we have
1108
not seen a definition before. */
1109
BFD_ASSERT ((hi->elf_link_hash_flags
1110
& (ELF_LINK_HASH_DEF_DYNAMIC
1111
| ELF_LINK_HASH_DEF_REGULAR)) == 0);
1113
(*bed->elf_backend_copy_indirect_symbol) (h, hi);
1115
/* See if the new flags lead us to realize that the symbol
1122
|| ((hi->elf_link_hash_flags
1123
& ELF_LINK_HASH_REF_DYNAMIC) != 0))
1128
if ((hi->elf_link_hash_flags
1129
& ELF_LINK_HASH_REF_REGULAR) != 0)
1139
/* Add symbols from an ELF object file to the linker hash table. */
1142
elf_link_add_object_symbols (abfd, info)
1144
struct bfd_link_info *info;
1146
boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
1147
const Elf_Internal_Sym *,
1148
const char **, flagword *,
1149
asection **, bfd_vma *));
1150
boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
1151
asection *, const Elf_Internal_Rela *));
1153
Elf_Internal_Shdr *hdr;
1154
bfd_size_type symcount;
1155
bfd_size_type extsymcount;
1156
bfd_size_type extsymoff;
1157
struct elf_link_hash_entry **sym_hash;
1159
Elf_External_Versym *extversym = NULL;
1160
Elf_External_Versym *ever;
1161
struct elf_link_hash_entry *weaks;
1162
Elf_Internal_Sym *isymbuf = NULL;
1163
Elf_Internal_Sym *isym;
1164
Elf_Internal_Sym *isymend;
1165
struct elf_backend_data *bed;
1167
struct elf_link_hash_table * hash_table;
1170
hash_table = elf_hash_table (info);
1172
bed = get_elf_backend_data (abfd);
1173
add_symbol_hook = bed->elf_add_symbol_hook;
1174
collect = bed->collect;
1176
if ((abfd->flags & DYNAMIC) == 0)
1182
/* You can't use -r against a dynamic object. Also, there's no
1183
hope of using a dynamic object which does not exactly match
1184
the format of the output file. */
1185
if (info->relocateable || info->hash->creator != abfd->xvec)
1187
bfd_set_error (bfd_error_invalid_operation);
1192
/* As a GNU extension, any input sections which are named
1193
.gnu.warning.SYMBOL are treated as warning symbols for the given
1194
symbol. This differs from .gnu.warning sections, which generate
1195
warnings when they are included in an output file. */
1200
for (s = abfd->sections; s != NULL; s = s->next)
1204
name = bfd_get_section_name (abfd, s);
1205
if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
1210
name += sizeof ".gnu.warning." - 1;
1212
/* If this is a shared object, then look up the symbol
1213
in the hash table. If it is there, and it is already
1214
been defined, then we will not be using the entry
1215
from this shared object, so we don't need to warn.
1216
FIXME: If we see the definition in a regular object
1217
later on, we will warn, but we shouldn't. The only
1218
fix is to keep track of what warnings we are supposed
1219
to emit, and then handle them all at the end of the
1221
if (dynamic && abfd->xvec == info->hash->creator)
1223
struct elf_link_hash_entry *h;
1225
h = elf_link_hash_lookup (hash_table, name,
1226
false, false, true);
1228
/* FIXME: What about bfd_link_hash_common? */
1230
&& (h->root.type == bfd_link_hash_defined
1231
|| h->root.type == bfd_link_hash_defweak))
1233
/* We don't want to issue this warning. Clobber
1234
the section size so that the warning does not
1235
get copied into the output file. */
1241
sz = bfd_section_size (abfd, s);
1242
msg = (char *) bfd_alloc (abfd, sz + 1);
1246
if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
1251
if (! (_bfd_generic_link_add_one_symbol
1252
(info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg,
1253
false, collect, (struct bfd_link_hash_entry **) NULL)))
1256
if (! info->relocateable)
1258
/* Clobber the section size so that the warning does
1259
not get copied into the output file. */
1269
/* If we are creating a shared library, create all the dynamic
1270
sections immediately. We need to attach them to something,
1271
so we attach them to this BFD, provided it is the right
1272
format. FIXME: If there are no input BFD's of the same
1273
format as the output, we can't make a shared library. */
1275
&& is_elf_hash_table (info)
1276
&& ! hash_table->dynamic_sections_created
1277
&& abfd->xvec == info->hash->creator)
1279
if (! elf_link_create_dynamic_sections (abfd, info))
1283
else if (! is_elf_hash_table (info))
1290
bfd_size_type oldsize;
1291
bfd_size_type strindex;
1293
/* Find the name to use in a DT_NEEDED entry that refers to this
1294
object. If the object has a DT_SONAME entry, we use it.
1295
Otherwise, if the generic linker stuck something in
1296
elf_dt_name, we use that. Otherwise, we just use the file
1297
name. If the generic linker put a null string into
1298
elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1299
there is a DT_SONAME entry. */
1301
name = bfd_get_filename (abfd);
1302
if (elf_dt_name (abfd) != NULL)
1304
name = elf_dt_name (abfd);
1307
if (elf_dt_soname (abfd) != NULL)
1313
s = bfd_get_section_by_name (abfd, ".dynamic");
1316
Elf_External_Dyn *dynbuf = NULL;
1317
Elf_External_Dyn *extdyn;
1318
Elf_External_Dyn *extdynend;
1320
unsigned long shlink;
1324
dynbuf = (Elf_External_Dyn *) bfd_malloc (s->_raw_size);
1328
if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
1329
(file_ptr) 0, s->_raw_size))
1330
goto error_free_dyn;
1332
elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1334
goto error_free_dyn;
1335
shlink = elf_elfsections (abfd)[elfsec]->sh_link;
1338
extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
1341
for (; extdyn < extdynend; extdyn++)
1343
Elf_Internal_Dyn dyn;
1345
elf_swap_dyn_in (abfd, extdyn, &dyn);
1346
if (dyn.d_tag == DT_SONAME)
1348
unsigned int tagv = dyn.d_un.d_val;
1349
name = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1351
goto error_free_dyn;
1353
if (dyn.d_tag == DT_NEEDED)
1355
struct bfd_link_needed_list *n, **pn;
1357
unsigned int tagv = dyn.d_un.d_val;
1359
amt = sizeof (struct bfd_link_needed_list);
1360
n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1361
fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1362
if (n == NULL || fnm == NULL)
1363
goto error_free_dyn;
1364
amt = strlen (fnm) + 1;
1365
anm = bfd_alloc (abfd, amt);
1367
goto error_free_dyn;
1368
memcpy (anm, fnm, (size_t) amt);
1372
for (pn = & hash_table->needed;
1378
if (dyn.d_tag == DT_RUNPATH)
1380
struct bfd_link_needed_list *n, **pn;
1382
unsigned int tagv = dyn.d_un.d_val;
1384
/* When we see DT_RPATH before DT_RUNPATH, we have
1385
to clear runpath. Do _NOT_ bfd_release, as that
1386
frees all more recently bfd_alloc'd blocks as
1388
if (rpath && hash_table->runpath)
1389
hash_table->runpath = NULL;
1391
amt = sizeof (struct bfd_link_needed_list);
1392
n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1393
fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1394
if (n == NULL || fnm == NULL)
1395
goto error_free_dyn;
1396
amt = strlen (fnm) + 1;
1397
anm = bfd_alloc (abfd, amt);
1399
goto error_free_dyn;
1400
memcpy (anm, fnm, (size_t) amt);
1404
for (pn = & hash_table->runpath;
1412
/* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1413
if (!runpath && dyn.d_tag == DT_RPATH)
1415
struct bfd_link_needed_list *n, **pn;
1417
unsigned int tagv = dyn.d_un.d_val;
1419
amt = sizeof (struct bfd_link_needed_list);
1420
n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1421
fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1422
if (n == NULL || fnm == NULL)
1423
goto error_free_dyn;
1424
amt = strlen (fnm) + 1;
1425
anm = bfd_alloc (abfd, amt);
1432
memcpy (anm, fnm, (size_t) amt);
1436
for (pn = & hash_table->runpath;
1448
/* We do not want to include any of the sections in a dynamic
1449
object in the output file. We hack by simply clobbering the
1450
list of sections in the BFD. This could be handled more
1451
cleanly by, say, a new section flag; the existing
1452
SEC_NEVER_LOAD flag is not the one we want, because that one
1453
still implies that the section takes up space in the output
1455
bfd_section_list_clear (abfd);
1457
/* If this is the first dynamic object found in the link, create
1458
the special sections required for dynamic linking. */
1459
if (! hash_table->dynamic_sections_created)
1460
if (! elf_link_create_dynamic_sections (abfd, info))
1465
/* Add a DT_NEEDED entry for this dynamic object. */
1466
oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
1467
strindex = _bfd_elf_strtab_add (hash_table->dynstr, name, false);
1468
if (strindex == (bfd_size_type) -1)
1471
if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
1474
Elf_External_Dyn *dyncon, *dynconend;
1476
/* The hash table size did not change, which means that
1477
the dynamic object name was already entered. If we
1478
have already included this dynamic object in the
1479
link, just ignore it. There is no reason to include
1480
a particular dynamic object more than once. */
1481
sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
1482
BFD_ASSERT (sdyn != NULL);
1484
dyncon = (Elf_External_Dyn *) sdyn->contents;
1485
dynconend = (Elf_External_Dyn *) (sdyn->contents +
1487
for (; dyncon < dynconend; dyncon++)
1489
Elf_Internal_Dyn dyn;
1491
elf_swap_dyn_in (hash_table->dynobj, dyncon, & dyn);
1492
if (dyn.d_tag == DT_NEEDED
1493
&& dyn.d_un.d_val == strindex)
1495
_bfd_elf_strtab_delref (hash_table->dynstr, strindex);
1501
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NEEDED, strindex))
1505
/* Save the SONAME, if there is one, because sometimes the
1506
linker emulation code will need to know it. */
1508
name = basename (bfd_get_filename (abfd));
1509
elf_dt_name (abfd) = name;
1512
/* If this is a dynamic object, we always link against the .dynsym
1513
symbol table, not the .symtab symbol table. The dynamic linker
1514
will only see the .dynsym symbol table, so there is no reason to
1515
look at .symtab for a dynamic object. */
1517
if (! dynamic || elf_dynsymtab (abfd) == 0)
1518
hdr = &elf_tdata (abfd)->symtab_hdr;
1520
hdr = &elf_tdata (abfd)->dynsymtab_hdr;
1522
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1524
/* The sh_info field of the symtab header tells us where the
1525
external symbols start. We don't care about the local symbols at
1527
if (elf_bad_symtab (abfd))
1529
extsymcount = symcount;
1534
extsymcount = symcount - hdr->sh_info;
1535
extsymoff = hdr->sh_info;
1539
if (extsymcount != 0)
1541
isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
1543
if (isymbuf == NULL)
1546
/* We store a pointer to the hash table entry for each external
1548
amt = extsymcount * sizeof (struct elf_link_hash_entry *);
1549
sym_hash = (struct elf_link_hash_entry **) bfd_alloc (abfd, amt);
1550
if (sym_hash == NULL)
1551
goto error_free_sym;
1552
elf_sym_hashes (abfd) = sym_hash;
1557
/* Read in any version definitions. */
1558
if (! _bfd_elf_slurp_version_tables (abfd))
1559
goto error_free_sym;
1561
/* Read in the symbol versions, but don't bother to convert them
1562
to internal format. */
1563
if (elf_dynversym (abfd) != 0)
1565
Elf_Internal_Shdr *versymhdr;
1567
versymhdr = &elf_tdata (abfd)->dynversym_hdr;
1568
extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
1569
if (extversym == NULL)
1570
goto error_free_sym;
1571
amt = versymhdr->sh_size;
1572
if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
1573
|| bfd_bread ((PTR) extversym, amt, abfd) != amt)
1574
goto error_free_vers;
1580
ever = extversym != NULL ? extversym + extsymoff : NULL;
1581
for (isym = isymbuf, isymend = isymbuf + extsymcount;
1583
isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
1590
struct elf_link_hash_entry *h;
1592
boolean size_change_ok, type_change_ok;
1593
boolean new_weakdef;
1594
unsigned int old_alignment;
1599
flags = BSF_NO_FLAGS;
1601
value = isym->st_value;
1604
bind = ELF_ST_BIND (isym->st_info);
1605
if (bind == STB_LOCAL)
1607
/* This should be impossible, since ELF requires that all
1608
global symbols follow all local symbols, and that sh_info
1609
point to the first global symbol. Unfortunatealy, Irix 5
1613
else if (bind == STB_GLOBAL)
1615
if (isym->st_shndx != SHN_UNDEF
1616
&& isym->st_shndx != SHN_COMMON)
1619
else if (bind == STB_WEAK)
1623
/* Leave it up to the processor backend. */
1626
if (isym->st_shndx == SHN_UNDEF)
1627
sec = bfd_und_section_ptr;
1628
else if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
1630
sec = section_from_elf_index (abfd, isym->st_shndx);
1632
sec = bfd_abs_section_ptr;
1633
else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
1636
else if (isym->st_shndx == SHN_ABS)
1637
sec = bfd_abs_section_ptr;
1638
else if (isym->st_shndx == SHN_COMMON)
1640
sec = bfd_com_section_ptr;
1641
/* What ELF calls the size we call the value. What ELF
1642
calls the value we call the alignment. */
1643
value = isym->st_size;
1647
/* Leave it up to the processor backend. */
1650
name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
1652
if (name == (const char *) NULL)
1653
goto error_free_vers;
1655
if (isym->st_shndx == SHN_COMMON
1656
&& ELF_ST_TYPE (isym->st_info) == STT_TLS)
1658
asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
1662
tcomm = bfd_make_section (abfd, ".tcommon");
1664
|| !bfd_set_section_flags (abfd, tcomm, (SEC_ALLOC
1666
| SEC_LINKER_CREATED
1667
| SEC_THREAD_LOCAL)))
1668
goto error_free_vers;
1672
else if (add_symbol_hook)
1674
if (! (*add_symbol_hook) (abfd, info, isym, &name, &flags, &sec,
1676
goto error_free_vers;
1678
/* The hook function sets the name to NULL if this symbol
1679
should be skipped for some reason. */
1680
if (name == (const char *) NULL)
1684
/* Sanity check that all possibilities were handled. */
1685
if (sec == (asection *) NULL)
1687
bfd_set_error (bfd_error_bad_value);
1688
goto error_free_vers;
1691
if (bfd_is_und_section (sec)
1692
|| bfd_is_com_section (sec))
1697
size_change_ok = false;
1698
type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
1700
if (info->hash->creator->flavour == bfd_target_elf_flavour)
1702
Elf_Internal_Versym iver;
1703
unsigned int vernum = 0;
1707
_bfd_elf_swap_versym_in (abfd, ever, &iver);
1708
vernum = iver.vs_vers & VERSYM_VERSION;
1710
/* If this is a hidden symbol, or if it is not version
1711
1, we append the version name to the symbol name.
1712
However, we do not modify a non-hidden absolute
1713
symbol, because it might be the version symbol
1714
itself. FIXME: What if it isn't? */
1715
if ((iver.vs_vers & VERSYM_HIDDEN) != 0
1716
|| (vernum > 1 && ! bfd_is_abs_section (sec)))
1719
size_t namelen, verlen, newlen;
1722
if (isym->st_shndx != SHN_UNDEF)
1724
if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
1726
(*_bfd_error_handler)
1727
(_("%s: %s: invalid version %u (max %d)"),
1728
bfd_archive_filename (abfd), name, vernum,
1729
elf_tdata (abfd)->dynverdef_hdr.sh_info);
1730
bfd_set_error (bfd_error_bad_value);
1731
goto error_free_vers;
1733
else if (vernum > 1)
1735
elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
1741
/* We cannot simply test for the number of
1742
entries in the VERNEED section since the
1743
numbers for the needed versions do not start
1745
Elf_Internal_Verneed *t;
1748
for (t = elf_tdata (abfd)->verref;
1752
Elf_Internal_Vernaux *a;
1754
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1756
if (a->vna_other == vernum)
1758
verstr = a->vna_nodename;
1767
(*_bfd_error_handler)
1768
(_("%s: %s: invalid needed version %d"),
1769
bfd_archive_filename (abfd), name, vernum);
1770
bfd_set_error (bfd_error_bad_value);
1771
goto error_free_vers;
1775
namelen = strlen (name);
1776
verlen = strlen (verstr);
1777
newlen = namelen + verlen + 2;
1778
if ((iver.vs_vers & VERSYM_HIDDEN) == 0
1779
&& isym->st_shndx != SHN_UNDEF)
1782
newname = (char *) bfd_alloc (abfd, (bfd_size_type) newlen);
1783
if (newname == NULL)
1784
goto error_free_vers;
1785
memcpy (newname, name, namelen);
1786
p = newname + namelen;
1788
/* If this is a defined non-hidden version symbol,
1789
we add another @ to the name. This indicates the
1790
default version of the symbol. */
1791
if ((iver.vs_vers & VERSYM_HIDDEN) == 0
1792
&& isym->st_shndx != SHN_UNDEF)
1794
memcpy (p, verstr, verlen + 1);
1800
if (! elf_merge_symbol (abfd, info, name, isym, &sec, &value,
1801
sym_hash, &override, &type_change_ok,
1802
&size_change_ok, dt_needed))
1803
goto error_free_vers;
1809
while (h->root.type == bfd_link_hash_indirect
1810
|| h->root.type == bfd_link_hash_warning)
1811
h = (struct elf_link_hash_entry *) h->root.u.i.link;
1813
/* Remember the old alignment if this is a common symbol, so
1814
that we don't reduce the alignment later on. We can't
1815
check later, because _bfd_generic_link_add_one_symbol
1816
will set a default for the alignment which we want to
1818
if (h->root.type == bfd_link_hash_common)
1819
old_alignment = h->root.u.c.p->alignment_power;
1821
if (elf_tdata (abfd)->verdef != NULL
1825
h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
1828
if (! (_bfd_generic_link_add_one_symbol
1829
(info, abfd, name, flags, sec, value, (const char *) NULL,
1830
false, collect, (struct bfd_link_hash_entry **) sym_hash)))
1831
goto error_free_vers;
1834
while (h->root.type == bfd_link_hash_indirect
1835
|| h->root.type == bfd_link_hash_warning)
1836
h = (struct elf_link_hash_entry *) h->root.u.i.link;
1839
new_weakdef = false;
1842
&& (flags & BSF_WEAK) != 0
1843
&& ELF_ST_TYPE (isym->st_info) != STT_FUNC
1844
&& info->hash->creator->flavour == bfd_target_elf_flavour
1845
&& h->weakdef == NULL)
1847
/* Keep a list of all weak defined non function symbols from
1848
a dynamic object, using the weakdef field. Later in this
1849
function we will set the weakdef field to the correct
1850
value. We only put non-function symbols from dynamic
1851
objects on this list, because that happens to be the only
1852
time we need to know the normal symbol corresponding to a
1853
weak symbol, and the information is time consuming to
1854
figure out. If the weakdef field is not already NULL,
1855
then this symbol was already defined by some previous
1856
dynamic object, and we will be using that previous
1857
definition anyhow. */
1864
/* Set the alignment of a common symbol. */
1865
if (isym->st_shndx == SHN_COMMON
1866
&& h->root.type == bfd_link_hash_common)
1870
align = bfd_log2 (isym->st_value);
1871
if (align > old_alignment
1872
/* Permit an alignment power of zero if an alignment of one
1873
is specified and no other alignments have been specified. */
1874
|| (isym->st_value == 1 && old_alignment == 0))
1875
h->root.u.c.p->alignment_power = align;
1878
if (info->hash->creator->flavour == bfd_target_elf_flavour)
1884
/* Remember the symbol size and type. */
1885
if (isym->st_size != 0
1886
&& (definition || h->size == 0))
1888
if (h->size != 0 && h->size != isym->st_size && ! size_change_ok)
1889
(*_bfd_error_handler)
1890
(_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1891
name, (unsigned long) h->size,
1892
(unsigned long) isym->st_size, bfd_archive_filename (abfd));
1894
h->size = isym->st_size;
1897
/* If this is a common symbol, then we always want H->SIZE
1898
to be the size of the common symbol. The code just above
1899
won't fix the size if a common symbol becomes larger. We
1900
don't warn about a size change here, because that is
1901
covered by --warn-common. */
1902
if (h->root.type == bfd_link_hash_common)
1903
h->size = h->root.u.c.size;
1905
if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
1906
&& (definition || h->type == STT_NOTYPE))
1908
if (h->type != STT_NOTYPE
1909
&& h->type != ELF_ST_TYPE (isym->st_info)
1910
&& ! type_change_ok)
1911
(*_bfd_error_handler)
1912
(_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1913
name, h->type, ELF_ST_TYPE (isym->st_info),
1914
bfd_archive_filename (abfd));
1916
h->type = ELF_ST_TYPE (isym->st_info);
1919
/* If st_other has a processor-specific meaning, specific code
1920
might be needed here. */
1921
if (isym->st_other != 0)
1923
/* Combine visibilities, using the most constraining one. */
1924
unsigned char hvis = ELF_ST_VISIBILITY (h->other);
1925
unsigned char symvis = ELF_ST_VISIBILITY (isym->st_other);
1927
if (symvis && (hvis > symvis || hvis == 0))
1928
h->other = isym->st_other;
1930
/* If neither has visibility, use the st_other of the
1931
definition. This is an arbitrary choice, since the
1932
other bits have no general meaning. */
1933
if (!symvis && !hvis
1934
&& (definition || h->other == 0))
1935
h->other = isym->st_other;
1938
/* Set a flag in the hash table entry indicating the type of
1939
reference or definition we just found. Keep a count of
1940
the number of dynamic symbols we find. A dynamic symbol
1941
is one which is referenced or defined by both a regular
1942
object and a shared object. */
1943
old_flags = h->elf_link_hash_flags;
1949
new_flag = ELF_LINK_HASH_REF_REGULAR;
1950
if (bind != STB_WEAK)
1951
new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK;
1954
new_flag = ELF_LINK_HASH_DEF_REGULAR;
1956
|| (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
1957
| ELF_LINK_HASH_REF_DYNAMIC)) != 0)
1963
new_flag = ELF_LINK_HASH_REF_DYNAMIC;
1965
new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
1966
if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
1967
| ELF_LINK_HASH_REF_REGULAR)) != 0
1968
|| (h->weakdef != NULL
1970
&& h->weakdef->dynindx != -1))
1974
h->elf_link_hash_flags |= new_flag;
1976
/* Check to see if we need to add an indirect symbol for
1977
the default name. */
1978
if (definition || h->root.type == bfd_link_hash_common)
1979
if (! elf_add_default_symbol (abfd, info, h, name, isym,
1980
&sec, &value, &dynsym,
1981
override, dt_needed))
1982
goto error_free_vers;
1984
if (dynsym && h->dynindx == -1)
1986
if (! _bfd_elf_link_record_dynamic_symbol (info, h))
1987
goto error_free_vers;
1988
if (h->weakdef != NULL
1990
&& h->weakdef->dynindx == -1)
1992
if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
1993
goto error_free_vers;
1996
else if (dynsym && h->dynindx != -1)
1997
/* If the symbol already has a dynamic index, but
1998
visibility says it should not be visible, turn it into
2000
switch (ELF_ST_VISIBILITY (h->other))
2004
(*bed->elf_backend_hide_symbol) (info, h, true);
2008
if (dt_needed && definition
2009
&& (h->elf_link_hash_flags
2010
& ELF_LINK_HASH_REF_REGULAR) != 0)
2012
bfd_size_type oldsize;
2013
bfd_size_type strindex;
2015
if (! is_elf_hash_table (info))
2016
goto error_free_vers;
2018
/* The symbol from a DT_NEEDED object is referenced from
2019
the regular object to create a dynamic executable. We
2020
have to make sure there is a DT_NEEDED entry for it. */
2023
oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
2024
strindex = _bfd_elf_strtab_add (hash_table->dynstr,
2025
elf_dt_soname (abfd), false);
2026
if (strindex == (bfd_size_type) -1)
2027
goto error_free_vers;
2029
if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
2032
Elf_External_Dyn *dyncon, *dynconend;
2034
sdyn = bfd_get_section_by_name (hash_table->dynobj,
2036
BFD_ASSERT (sdyn != NULL);
2038
dyncon = (Elf_External_Dyn *) sdyn->contents;
2039
dynconend = (Elf_External_Dyn *) (sdyn->contents +
2041
for (; dyncon < dynconend; dyncon++)
2043
Elf_Internal_Dyn dyn;
2045
elf_swap_dyn_in (hash_table->dynobj,
2047
BFD_ASSERT (dyn.d_tag != DT_NEEDED ||
2048
dyn.d_un.d_val != strindex);
2052
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NEEDED, strindex))
2053
goto error_free_vers;
2058
if (extversym != NULL)
2064
if (isymbuf != NULL)
2068
/* Now set the weakdefs field correctly for all the weak defined
2069
symbols we found. The only way to do this is to search all the
2070
symbols. Since we only need the information for non functions in
2071
dynamic objects, that's the only time we actually put anything on
2072
the list WEAKS. We need this information so that if a regular
2073
object refers to a symbol defined weakly in a dynamic object, the
2074
real symbol in the dynamic object is also put in the dynamic
2075
symbols; we also must arrange for both symbols to point to the
2076
same memory location. We could handle the general case of symbol
2077
aliasing, but a general symbol alias can only be generated in
2078
assembler code, handling it correctly would be very time
2079
consuming, and other ELF linkers don't handle general aliasing
2081
while (weaks != NULL)
2083
struct elf_link_hash_entry *hlook;
2086
struct elf_link_hash_entry **hpp;
2087
struct elf_link_hash_entry **hppend;
2090
weaks = hlook->weakdef;
2091
hlook->weakdef = NULL;
2093
BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
2094
|| hlook->root.type == bfd_link_hash_defweak
2095
|| hlook->root.type == bfd_link_hash_common
2096
|| hlook->root.type == bfd_link_hash_indirect);
2097
slook = hlook->root.u.def.section;
2098
vlook = hlook->root.u.def.value;
2100
hpp = elf_sym_hashes (abfd);
2101
hppend = hpp + extsymcount;
2102
for (; hpp < hppend; hpp++)
2104
struct elf_link_hash_entry *h;
2107
if (h != NULL && h != hlook
2108
&& h->root.type == bfd_link_hash_defined
2109
&& h->root.u.def.section == slook
2110
&& h->root.u.def.value == vlook)
2114
/* If the weak definition is in the list of dynamic
2115
symbols, make sure the real definition is put there
2117
if (hlook->dynindx != -1
2118
&& h->dynindx == -1)
2120
if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2124
/* If the real definition is in the list of dynamic
2125
symbols, make sure the weak definition is put there
2126
as well. If we don't do this, then the dynamic
2127
loader might not merge the entries for the real
2128
definition and the weak definition. */
2129
if (h->dynindx != -1
2130
&& hlook->dynindx == -1)
2132
if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
2140
/* If this object is the same format as the output object, and it is
2141
not a shared library, then let the backend look through the
2144
This is required to build global offset table entries and to
2145
arrange for dynamic relocs. It is not required for the
2146
particular common case of linking non PIC code, even when linking
2147
against shared libraries, but unfortunately there is no way of
2148
knowing whether an object file has been compiled PIC or not.
2149
Looking through the relocs is not particularly time consuming.
2150
The problem is that we must either (1) keep the relocs in memory,
2151
which causes the linker to require additional runtime memory or
2152
(2) read the relocs twice from the input file, which wastes time.
2153
This would be a good case for using mmap.
2155
I have no idea how to handle linking PIC code into a file of a
2156
different format. It probably can't be done. */
2157
check_relocs = get_elf_backend_data (abfd)->check_relocs;
2159
&& abfd->xvec == info->hash->creator
2160
&& check_relocs != NULL)
2164
for (o = abfd->sections; o != NULL; o = o->next)
2166
Elf_Internal_Rela *internal_relocs;
2169
if ((o->flags & SEC_RELOC) == 0
2170
|| o->reloc_count == 0
2171
|| ((info->strip == strip_all || info->strip == strip_debugger)
2172
&& (o->flags & SEC_DEBUGGING) != 0)
2173
|| bfd_is_abs_section (o->output_section))
2176
internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2177
(abfd, o, (PTR) NULL,
2178
(Elf_Internal_Rela *) NULL,
2179
info->keep_memory));
2180
if (internal_relocs == NULL)
2183
ok = (*check_relocs) (abfd, info, o, internal_relocs);
2185
if (elf_section_data (o)->relocs != internal_relocs)
2186
free (internal_relocs);
2193
/* If this is a non-traditional, non-relocateable link, try to
2194
optimize the handling of the .stab/.stabstr sections. */
2196
&& ! info->relocateable
2197
&& ! info->traditional_format
2198
&& info->hash->creator->flavour == bfd_target_elf_flavour
2199
&& is_elf_hash_table (info)
2200
&& (info->strip != strip_all && info->strip != strip_debugger))
2202
asection *stab, *stabstr;
2204
stab = bfd_get_section_by_name (abfd, ".stab");
2206
&& (stab->flags & SEC_MERGE) == 0
2207
&& !bfd_is_abs_section (stab->output_section))
2209
stabstr = bfd_get_section_by_name (abfd, ".stabstr");
2211
if (stabstr != NULL)
2213
struct bfd_elf_section_data *secdata;
2215
secdata = elf_section_data (stab);
2216
if (! _bfd_link_section_stabs (abfd,
2217
& hash_table->stab_info,
2219
&secdata->sec_info))
2221
if (secdata->sec_info)
2222
secdata->sec_info_type = ELF_INFO_TYPE_STABS;
2227
if (! info->relocateable && ! dynamic
2228
&& is_elf_hash_table (info))
2232
for (s = abfd->sections; s != NULL; s = s->next)
2233
if ((s->flags & SEC_MERGE) != 0
2234
&& !bfd_is_abs_section (s->output_section))
2236
struct bfd_elf_section_data *secdata;
2238
secdata = elf_section_data (s);
2239
if (! _bfd_merge_section (abfd,
2240
& hash_table->merge_info,
2241
s, &secdata->sec_info))
2243
else if (secdata->sec_info)
2244
secdata->sec_info_type = ELF_INFO_TYPE_MERGE;
2248
if (is_elf_hash_table (info))
2250
/* Add this bfd to the loaded list. */
2251
struct elf_link_loaded_list *n;
2253
n = ((struct elf_link_loaded_list *)
2254
bfd_alloc (abfd, sizeof (struct elf_link_loaded_list)));
2258
n->next = hash_table->loaded;
2259
hash_table->loaded = n;
2265
if (extversym != NULL)
2268
if (isymbuf != NULL)
2274
/* Create some sections which will be filled in with dynamic linking
2275
information. ABFD is an input file which requires dynamic sections
2276
to be created. The dynamic sections take up virtual memory space
2277
when the final executable is run, so we need to create them before
2278
addresses are assigned to the output sections. We work out the
2279
actual contents and size of these sections later. */
2282
elf_link_create_dynamic_sections (abfd, info)
2284
struct bfd_link_info *info;
2287
register asection *s;
2288
struct elf_link_hash_entry *h;
2289
struct elf_backend_data *bed;
2291
if (! is_elf_hash_table (info))
2294
if (elf_hash_table (info)->dynamic_sections_created)
2297
/* Make sure that all dynamic sections use the same input BFD. */
2298
if (elf_hash_table (info)->dynobj == NULL)
2299
elf_hash_table (info)->dynobj = abfd;
2301
abfd = elf_hash_table (info)->dynobj;
2303
/* Note that we set the SEC_IN_MEMORY flag for all of these
2305
flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
2306
| SEC_IN_MEMORY | SEC_LINKER_CREATED);
2308
/* A dynamically linked executable has a .interp section, but a
2309
shared library does not. */
2312
s = bfd_make_section (abfd, ".interp");
2314
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2318
if (! info->traditional_format
2319
&& info->hash->creator->flavour == bfd_target_elf_flavour)
2321
s = bfd_make_section (abfd, ".eh_frame_hdr");
2323
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2324
|| ! bfd_set_section_alignment (abfd, s, 2))
2328
/* Create sections to hold version informations. These are removed
2329
if they are not needed. */
2330
s = bfd_make_section (abfd, ".gnu.version_d");
2332
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2333
|| ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2336
s = bfd_make_section (abfd, ".gnu.version");
2338
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2339
|| ! bfd_set_section_alignment (abfd, s, 1))
2342
s = bfd_make_section (abfd, ".gnu.version_r");
2344
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2345
|| ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2348
s = bfd_make_section (abfd, ".dynsym");
2350
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2351
|| ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2354
s = bfd_make_section (abfd, ".dynstr");
2356
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2359
/* Create a strtab to hold the dynamic symbol names. */
2360
if (elf_hash_table (info)->dynstr == NULL)
2362
elf_hash_table (info)->dynstr = _bfd_elf_strtab_init ();
2363
if (elf_hash_table (info)->dynstr == NULL)
2367
s = bfd_make_section (abfd, ".dynamic");
2369
|| ! bfd_set_section_flags (abfd, s, flags)
2370
|| ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2373
/* The special symbol _DYNAMIC is always set to the start of the
2374
.dynamic section. This call occurs before we have processed the
2375
symbols for any dynamic object, so we don't have to worry about
2376
overriding a dynamic definition. We could set _DYNAMIC in a
2377
linker script, but we only want to define it if we are, in fact,
2378
creating a .dynamic section. We don't want to define it if there
2379
is no .dynamic section, since on some ELF platforms the start up
2380
code examines it to decide how to initialize the process. */
2382
if (! (_bfd_generic_link_add_one_symbol
2383
(info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
2384
(const char *) NULL, false, get_elf_backend_data (abfd)->collect,
2385
(struct bfd_link_hash_entry **) &h)))
2387
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2388
h->type = STT_OBJECT;
2391
&& ! _bfd_elf_link_record_dynamic_symbol (info, h))
2394
bed = get_elf_backend_data (abfd);
2396
s = bfd_make_section (abfd, ".hash");
2398
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2399
|| ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2401
elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
2403
/* Let the backend create the rest of the sections. This lets the
2404
backend set the right flags. The backend will normally create
2405
the .got and .plt sections. */
2406
if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
2409
elf_hash_table (info)->dynamic_sections_created = true;
2414
/* Add an entry to the .dynamic table. */
2417
elf_add_dynamic_entry (info, tag, val)
2418
struct bfd_link_info *info;
2422
Elf_Internal_Dyn dyn;
2425
bfd_size_type newsize;
2426
bfd_byte *newcontents;
2428
if (! is_elf_hash_table (info))
2431
dynobj = elf_hash_table (info)->dynobj;
2433
s = bfd_get_section_by_name (dynobj, ".dynamic");
2434
BFD_ASSERT (s != NULL);
2436
newsize = s->_raw_size + sizeof (Elf_External_Dyn);
2437
newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
2438
if (newcontents == NULL)
2442
dyn.d_un.d_val = val;
2443
elf_swap_dyn_out (dynobj, &dyn,
2444
(Elf_External_Dyn *) (newcontents + s->_raw_size));
2446
s->_raw_size = newsize;
2447
s->contents = newcontents;
2452
/* Record a new local dynamic symbol. */
2455
elf_link_record_local_dynamic_symbol (info, input_bfd, input_indx)
2456
struct bfd_link_info *info;
2460
struct elf_link_local_dynamic_entry *entry;
2461
struct elf_link_hash_table *eht;
2462
struct elf_strtab_hash *dynstr;
2463
Elf_External_Sym esym;
2464
Elf_External_Sym_Shndx eshndx;
2465
Elf_External_Sym_Shndx *shndx;
2466
unsigned long dynstr_index;
2471
if (! is_elf_hash_table (info))
2474
/* See if the entry exists already. */
2475
for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
2476
if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
2479
entry = (struct elf_link_local_dynamic_entry *)
2480
bfd_alloc (input_bfd, (bfd_size_type) sizeof (*entry));
2484
/* Go find the symbol, so that we can find it's name. */
2485
amt = sizeof (Elf_External_Sym);
2486
pos = elf_tdata (input_bfd)->symtab_hdr.sh_offset + input_indx * amt;
2487
if (bfd_seek (input_bfd, pos, SEEK_SET) != 0
2488
|| bfd_bread ((PTR) &esym, amt, input_bfd) != amt)
2491
if (elf_tdata (input_bfd)->symtab_shndx_hdr.sh_size != 0)
2493
amt = sizeof (Elf_External_Sym_Shndx);
2494
pos = elf_tdata (input_bfd)->symtab_shndx_hdr.sh_offset;
2495
pos += input_indx * amt;
2497
if (bfd_seek (input_bfd, pos, SEEK_SET) != 0
2498
|| bfd_bread ((PTR) shndx, amt, input_bfd) != amt)
2501
elf_swap_symbol_in (input_bfd, (const PTR) &esym, (const PTR) shndx,
2504
name = (bfd_elf_string_from_elf_section
2505
(input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
2506
entry->isym.st_name));
2508
dynstr = elf_hash_table (info)->dynstr;
2511
/* Create a strtab to hold the dynamic symbol names. */
2512
elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
2517
dynstr_index = _bfd_elf_strtab_add (dynstr, name, false);
2518
if (dynstr_index == (unsigned long) -1)
2520
entry->isym.st_name = dynstr_index;
2522
eht = elf_hash_table (info);
2524
entry->next = eht->dynlocal;
2525
eht->dynlocal = entry;
2526
entry->input_bfd = input_bfd;
2527
entry->input_indx = input_indx;
2530
/* Whatever binding the symbol had before, it's now local. */
2532
= ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
2534
/* The dynindx will be set at the end of size_dynamic_sections. */
2539
/* Read and swap the relocs from the section indicated by SHDR. This
2540
may be either a REL or a RELA section. The relocations are
2541
translated into RELA relocations and stored in INTERNAL_RELOCS,
2542
which should have already been allocated to contain enough space.
2543
The EXTERNAL_RELOCS are a buffer where the external form of the
2544
relocations should be stored.
2546
Returns false if something goes wrong. */
2549
elf_link_read_relocs_from_section (abfd, shdr, external_relocs,
2552
Elf_Internal_Shdr *shdr;
2553
PTR external_relocs;
2554
Elf_Internal_Rela *internal_relocs;
2556
struct elf_backend_data *bed;
2559
/* If there aren't any relocations, that's OK. */
2563
/* Position ourselves at the start of the section. */
2564
if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2567
/* Read the relocations. */
2568
if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2571
bed = get_elf_backend_data (abfd);
2573
/* Convert the external relocations to the internal format. */
2574
if (shdr->sh_entsize == sizeof (Elf_External_Rel))
2576
Elf_External_Rel *erel;
2577
Elf_External_Rel *erelend;
2578
Elf_Internal_Rela *irela;
2579
Elf_Internal_Rel *irel;
2581
erel = (Elf_External_Rel *) external_relocs;
2582
erelend = erel + NUM_SHDR_ENTRIES (shdr);
2583
irela = internal_relocs;
2584
amt = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
2585
irel = bfd_alloc (abfd, amt);
2586
for (; erel < erelend; erel++, irela += bed->s->int_rels_per_ext_rel)
2590
if (bed->s->swap_reloc_in)
2591
(*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
2593
elf_swap_reloc_in (abfd, erel, irel);
2595
for (i = 0; i < bed->s->int_rels_per_ext_rel; ++i)
2597
irela[i].r_offset = irel[i].r_offset;
2598
irela[i].r_info = irel[i].r_info;
2599
irela[i].r_addend = 0;
2605
Elf_External_Rela *erela;
2606
Elf_External_Rela *erelaend;
2607
Elf_Internal_Rela *irela;
2609
BFD_ASSERT (shdr->sh_entsize == sizeof (Elf_External_Rela));
2611
erela = (Elf_External_Rela *) external_relocs;
2612
erelaend = erela + NUM_SHDR_ENTRIES (shdr);
2613
irela = internal_relocs;
2614
for (; erela < erelaend; erela++, irela += bed->s->int_rels_per_ext_rel)
2616
if (bed->s->swap_reloca_in)
2617
(*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
2619
elf_swap_reloca_in (abfd, erela, irela);
2626
/* Read and swap the relocs for a section O. They may have been
2627
cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2628
not NULL, they are used as buffers to read into. They are known to
2629
be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2630
the return value is allocated using either malloc or bfd_alloc,
2631
according to the KEEP_MEMORY argument. If O has two relocation
2632
sections (both REL and RELA relocations), then the REL_HDR
2633
relocations will appear first in INTERNAL_RELOCS, followed by the
2634
REL_HDR2 relocations. */
2637
NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
2641
PTR external_relocs;
2642
Elf_Internal_Rela *internal_relocs;
2643
boolean keep_memory;
2645
Elf_Internal_Shdr *rel_hdr;
2647
Elf_Internal_Rela *alloc2 = NULL;
2648
struct elf_backend_data *bed = get_elf_backend_data (abfd);
2650
if (elf_section_data (o)->relocs != NULL)
2651
return elf_section_data (o)->relocs;
2653
if (o->reloc_count == 0)
2656
rel_hdr = &elf_section_data (o)->rel_hdr;
2658
if (internal_relocs == NULL)
2662
size = o->reloc_count;
2663
size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2665
internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2667
internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2668
if (internal_relocs == NULL)
2672
if (external_relocs == NULL)
2674
bfd_size_type size = rel_hdr->sh_size;
2676
if (elf_section_data (o)->rel_hdr2)
2677
size += elf_section_data (o)->rel_hdr2->sh_size;
2678
alloc1 = (PTR) bfd_malloc (size);
2681
external_relocs = alloc1;
2684
if (!elf_link_read_relocs_from_section (abfd, rel_hdr,
2688
if (!elf_link_read_relocs_from_section
2690
elf_section_data (o)->rel_hdr2,
2691
((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2692
internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
2693
* bed->s->int_rels_per_ext_rel)))
2696
/* Cache the results for next time, if we can. */
2698
elf_section_data (o)->relocs = internal_relocs;
2703
/* Don't free alloc2, since if it was allocated we are passing it
2704
back (under the name of internal_relocs). */
2706
return internal_relocs;
2716
/* Record an assignment to a symbol made by a linker script. We need
2717
this in case some dynamic object refers to this symbol. */
2720
NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
2721
bfd *output_bfd ATTRIBUTE_UNUSED;
2722
struct bfd_link_info *info;
2726
struct elf_link_hash_entry *h;
2728
if (info->hash->creator->flavour != bfd_target_elf_flavour)
2731
h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
2735
if (h->root.type == bfd_link_hash_new)
2736
h->elf_link_hash_flags &= ~ELF_LINK_NON_ELF;
2738
/* If this symbol is being provided by the linker script, and it is
2739
currently defined by a dynamic object, but not by a regular
2740
object, then mark it as undefined so that the generic linker will
2741
force the correct value. */
2743
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2744
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2745
h->root.type = bfd_link_hash_undefined;
2747
/* If this symbol is not being provided by the linker script, and it is
2748
currently defined by a dynamic object, but not by a regular object,
2749
then clear out any version information because the symbol will not be
2750
associated with the dynamic object any more. */
2752
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2753
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2754
h->verinfo.verdef = NULL;
2756
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2758
if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2759
| ELF_LINK_HASH_REF_DYNAMIC)) != 0
2761
&& h->dynindx == -1)
2763
if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2766
/* If this is a weak defined symbol, and we know a corresponding
2767
real symbol from the same dynamic object, make sure the real
2768
symbol is also made into a dynamic symbol. */
2769
if (h->weakdef != NULL
2770
&& h->weakdef->dynindx == -1)
2772
if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2780
/* This structure is used to pass information to
2781
elf_link_assign_sym_version. */
2783
struct elf_assign_sym_version_info
2787
/* General link information. */
2788
struct bfd_link_info *info;
2790
struct bfd_elf_version_tree *verdefs;
2791
/* Whether we had a failure. */
2795
/* This structure is used to pass information to
2796
elf_link_find_version_dependencies. */
2798
struct elf_find_verdep_info
2802
/* General link information. */
2803
struct bfd_link_info *info;
2804
/* The number of dependencies. */
2806
/* Whether we had a failure. */
2810
/* Array used to determine the number of hash table buckets to use
2811
based on the number of symbols there are. If there are fewer than
2812
3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2813
fewer than 37 we use 17 buckets, and so forth. We never use more
2814
than 32771 buckets. */
2816
static const size_t elf_buckets[] =
2818
1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2822
/* Compute bucket count for hashing table. We do not use a static set
2823
of possible tables sizes anymore. Instead we determine for all
2824
possible reasonable sizes of the table the outcome (i.e., the
2825
number of collisions etc) and choose the best solution. The
2826
weighting functions are not too simple to allow the table to grow
2827
without bounds. Instead one of the weighting factors is the size.
2828
Therefore the result is always a good payoff between few collisions
2829
(= short chain lengths) and table size. */
2831
compute_bucket_count (info)
2832
struct bfd_link_info *info;
2834
size_t dynsymcount = elf_hash_table (info)->dynsymcount;
2835
size_t best_size = 0;
2836
unsigned long int *hashcodes;
2837
unsigned long int *hashcodesp;
2838
unsigned long int i;
2841
/* Compute the hash values for all exported symbols. At the same
2842
time store the values in an array so that we could use them for
2845
amt *= sizeof (unsigned long int);
2846
hashcodes = (unsigned long int *) bfd_malloc (amt);
2847
if (hashcodes == NULL)
2849
hashcodesp = hashcodes;
2851
/* Put all hash values in HASHCODES. */
2852
elf_link_hash_traverse (elf_hash_table (info),
2853
elf_collect_hash_codes, &hashcodesp);
2855
/* We have a problem here. The following code to optimize the table
2856
size requires an integer type with more the 32 bits. If
2857
BFD_HOST_U_64_BIT is set we know about such a type. */
2858
#ifdef BFD_HOST_U_64_BIT
2861
unsigned long int nsyms = hashcodesp - hashcodes;
2864
BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
2865
unsigned long int *counts ;
2867
/* Possible optimization parameters: if we have NSYMS symbols we say
2868
that the hashing table must at least have NSYMS/4 and at most
2870
minsize = nsyms / 4;
2873
best_size = maxsize = nsyms * 2;
2875
/* Create array where we count the collisions in. We must use bfd_malloc
2876
since the size could be large. */
2878
amt *= sizeof (unsigned long int);
2879
counts = (unsigned long int *) bfd_malloc (amt);
2886
/* Compute the "optimal" size for the hash table. The criteria is a
2887
minimal chain length. The minor criteria is (of course) the size
2889
for (i = minsize; i < maxsize; ++i)
2891
/* Walk through the array of hashcodes and count the collisions. */
2892
BFD_HOST_U_64_BIT max;
2893
unsigned long int j;
2894
unsigned long int fact;
2896
memset (counts, '\0', i * sizeof (unsigned long int));
2898
/* Determine how often each hash bucket is used. */
2899
for (j = 0; j < nsyms; ++j)
2900
++counts[hashcodes[j] % i];
2902
/* For the weight function we need some information about the
2903
pagesize on the target. This is information need not be 100%
2904
accurate. Since this information is not available (so far) we
2905
define it here to a reasonable default value. If it is crucial
2906
to have a better value some day simply define this value. */
2907
# ifndef BFD_TARGET_PAGESIZE
2908
# define BFD_TARGET_PAGESIZE (4096)
2911
/* We in any case need 2 + NSYMS entries for the size values and
2913
max = (2 + nsyms) * (ARCH_SIZE / 8);
2916
/* Variant 1: optimize for short chains. We add the squares
2917
of all the chain lengths (which favous many small chain
2918
over a few long chains). */
2919
for (j = 0; j < i; ++j)
2920
max += counts[j] * counts[j];
2922
/* This adds penalties for the overall size of the table. */
2923
fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2926
/* Variant 2: Optimize a lot more for small table. Here we
2927
also add squares of the size but we also add penalties for
2928
empty slots (the +1 term). */
2929
for (j = 0; j < i; ++j)
2930
max += (1 + counts[j]) * (1 + counts[j]);
2932
/* The overall size of the table is considered, but not as
2933
strong as in variant 1, where it is squared. */
2934
fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2938
/* Compare with current best results. */
2939
if (max < best_chlen)
2949
#endif /* defined (BFD_HOST_U_64_BIT) */
2951
/* This is the fallback solution if no 64bit type is available or if we
2952
are not supposed to spend much time on optimizations. We select the
2953
bucket count using a fixed set of numbers. */
2954
for (i = 0; elf_buckets[i] != 0; i++)
2956
best_size = elf_buckets[i];
2957
if (dynsymcount < elf_buckets[i + 1])
2962
/* Free the arrays we needed. */
2968
/* Set up the sizes and contents of the ELF dynamic sections. This is
2969
called by the ELF linker emulation before_allocation routine. We
2970
must set the sizes of the sections before the linker sets the
2971
addresses of the various sections. */
2974
NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
2976
auxiliary_filters, info, sinterpptr,
2981
const char *filter_shlib;
2982
const char * const *auxiliary_filters;
2983
struct bfd_link_info *info;
2984
asection **sinterpptr;
2985
struct bfd_elf_version_tree *verdefs;
2987
bfd_size_type soname_indx;
2989
struct elf_backend_data *bed;
2990
struct elf_assign_sym_version_info asvinfo;
2994
soname_indx = (bfd_size_type) -1;
2996
if (info->hash->creator->flavour != bfd_target_elf_flavour)
2999
if (! is_elf_hash_table (info))
3002
/* Any syms created from now on start with -1 in
3003
got.refcount/offset and plt.refcount/offset. */
3004
elf_hash_table (info)->init_refcount = -1;
3006
/* The backend may have to create some sections regardless of whether
3007
we're dynamic or not. */
3008
bed = get_elf_backend_data (output_bfd);
3009
if (bed->elf_backend_always_size_sections
3010
&& ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
3013
dynobj = elf_hash_table (info)->dynobj;
3015
/* If there were no dynamic objects in the link, there is nothing to
3020
if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
3023
if (elf_hash_table (info)->dynamic_sections_created)
3025
struct elf_info_failed eif;
3026
struct elf_link_hash_entry *h;
3029
*sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
3030
BFD_ASSERT (*sinterpptr != NULL || info->shared);
3034
soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3036
if (soname_indx == (bfd_size_type) -1
3037
|| ! elf_add_dynamic_entry (info, (bfd_vma) DT_SONAME,
3044
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMBOLIC,
3047
info->flags |= DF_SYMBOLIC;
3054
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
3056
if (info->new_dtags)
3057
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
3058
if (indx == (bfd_size_type) -1
3059
|| ! elf_add_dynamic_entry (info, (bfd_vma) DT_RPATH, indx)
3061
&& ! elf_add_dynamic_entry (info, (bfd_vma) DT_RUNPATH,
3066
if (filter_shlib != NULL)
3070
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3071
filter_shlib, true);
3072
if (indx == (bfd_size_type) -1
3073
|| ! elf_add_dynamic_entry (info, (bfd_vma) DT_FILTER, indx))
3077
if (auxiliary_filters != NULL)
3079
const char * const *p;
3081
for (p = auxiliary_filters; *p != NULL; p++)
3085
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3087
if (indx == (bfd_size_type) -1
3088
|| ! elf_add_dynamic_entry (info, (bfd_vma) DT_AUXILIARY,
3095
eif.verdefs = verdefs;
3098
/* If we are supposed to export all symbols into the dynamic symbol
3099
table (this is not the normal case), then do so. */
3100
if (info->export_dynamic)
3102
elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
3108
/* Attach all the symbols to their version information. */
3109
asvinfo.output_bfd = output_bfd;
3110
asvinfo.info = info;
3111
asvinfo.verdefs = verdefs;
3112
asvinfo.failed = false;
3114
elf_link_hash_traverse (elf_hash_table (info),
3115
elf_link_assign_sym_version,
3120
/* Find all symbols which were defined in a dynamic object and make
3121
the backend pick a reasonable value for them. */
3122
elf_link_hash_traverse (elf_hash_table (info),
3123
elf_adjust_dynamic_symbol,
3128
/* Add some entries to the .dynamic section. We fill in some of the
3129
values later, in elf_bfd_final_link, but we must add the entries
3130
now so that we know the final size of the .dynamic section. */
3132
/* If there are initialization and/or finalization functions to
3133
call then add the corresponding DT_INIT/DT_FINI entries. */
3134
h = (info->init_function
3135
? elf_link_hash_lookup (elf_hash_table (info),
3136
info->init_function, false,
3140
&& (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3141
| ELF_LINK_HASH_DEF_REGULAR)) != 0)
3143
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_INIT, (bfd_vma) 0))
3146
h = (info->fini_function
3147
? elf_link_hash_lookup (elf_hash_table (info),
3148
info->fini_function, false,
3152
&& (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3153
| ELF_LINK_HASH_DEF_REGULAR)) != 0)
3155
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FINI, (bfd_vma) 0))
3159
if (bfd_get_section_by_name (output_bfd, ".preinit_array") != NULL)
3161
/* DT_PREINIT_ARRAY is not allowed in shared library. */
3167
for (sub = info->input_bfds; sub != NULL;
3168
sub = sub->link_next)
3169
for (o = sub->sections; o != NULL; o = o->next)
3170
if (elf_section_data (o)->this_hdr.sh_type
3171
== SHT_PREINIT_ARRAY)
3173
(*_bfd_error_handler)
3174
(_("%s: .preinit_array section is not allowed in DSO"),
3175
bfd_archive_filename (sub));
3179
bfd_set_error (bfd_error_nonrepresentable_section);
3183
if (!elf_add_dynamic_entry (info, (bfd_vma) DT_PREINIT_ARRAY,
3185
|| !elf_add_dynamic_entry (info, (bfd_vma) DT_PREINIT_ARRAYSZ,
3189
if (bfd_get_section_by_name (output_bfd, ".init_array") != NULL)
3191
if (!elf_add_dynamic_entry (info, (bfd_vma) DT_INIT_ARRAY,
3193
|| !elf_add_dynamic_entry (info, (bfd_vma) DT_INIT_ARRAYSZ,
3197
if (bfd_get_section_by_name (output_bfd, ".fini_array") != NULL)
3199
if (!elf_add_dynamic_entry (info, (bfd_vma) DT_FINI_ARRAY,
3201
|| !elf_add_dynamic_entry (info, (bfd_vma) DT_FINI_ARRAYSZ,
3206
dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
3207
/* If .dynstr is excluded from the link, we don't want any of
3208
these tags. Strictly, we should be checking each section
3209
individually; This quick check covers for the case where
3210
someone does a /DISCARD/ : { *(*) }. */
3211
if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
3213
bfd_size_type strsize;
3215
strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
3216
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_HASH, (bfd_vma) 0)
3217
|| ! elf_add_dynamic_entry (info, (bfd_vma) DT_STRTAB, (bfd_vma) 0)
3218
|| ! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMTAB, (bfd_vma) 0)
3219
|| ! elf_add_dynamic_entry (info, (bfd_vma) DT_STRSZ, strsize)
3220
|| ! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMENT,
3221
(bfd_vma) sizeof (Elf_External_Sym)))
3226
/* The backend must work out the sizes of all the other dynamic
3228
if (bed->elf_backend_size_dynamic_sections
3229
&& ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
3232
if (elf_hash_table (info)->dynamic_sections_created)
3234
bfd_size_type dynsymcount;
3236
size_t bucketcount = 0;
3237
size_t hash_entry_size;
3238
unsigned int dtagcount;
3240
/* Set up the version definition section. */
3241
s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3242
BFD_ASSERT (s != NULL);
3244
/* We may have created additional version definitions if we are
3245
just linking a regular application. */
3246
verdefs = asvinfo.verdefs;
3248
/* Skip anonymous version tag. */
3249
if (verdefs != NULL && verdefs->vernum == 0)
3250
verdefs = verdefs->next;
3252
if (verdefs == NULL)
3253
_bfd_strip_section_from_output (info, s);
3258
struct bfd_elf_version_tree *t;
3260
Elf_Internal_Verdef def;
3261
Elf_Internal_Verdaux defaux;
3266
/* Make space for the base version. */
3267
size += sizeof (Elf_External_Verdef);
3268
size += sizeof (Elf_External_Verdaux);
3271
for (t = verdefs; t != NULL; t = t->next)
3273
struct bfd_elf_version_deps *n;
3275
size += sizeof (Elf_External_Verdef);
3276
size += sizeof (Elf_External_Verdaux);
3279
for (n = t->deps; n != NULL; n = n->next)
3280
size += sizeof (Elf_External_Verdaux);
3283
s->_raw_size = size;
3284
s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3285
if (s->contents == NULL && s->_raw_size != 0)
3288
/* Fill in the version definition section. */
3292
def.vd_version = VER_DEF_CURRENT;
3293
def.vd_flags = VER_FLG_BASE;
3296
def.vd_aux = sizeof (Elf_External_Verdef);
3297
def.vd_next = (sizeof (Elf_External_Verdef)
3298
+ sizeof (Elf_External_Verdaux));
3300
if (soname_indx != (bfd_size_type) -1)
3302
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3304
def.vd_hash = bfd_elf_hash (soname);
3305
defaux.vda_name = soname_indx;
3312
name = basename (output_bfd->filename);
3313
def.vd_hash = bfd_elf_hash (name);
3314
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3316
if (indx == (bfd_size_type) -1)
3318
defaux.vda_name = indx;
3320
defaux.vda_next = 0;
3322
_bfd_elf_swap_verdef_out (output_bfd, &def,
3323
(Elf_External_Verdef *) p);
3324
p += sizeof (Elf_External_Verdef);
3325
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3326
(Elf_External_Verdaux *) p);
3327
p += sizeof (Elf_External_Verdaux);
3329
for (t = verdefs; t != NULL; t = t->next)
3332
struct bfd_elf_version_deps *n;
3333
struct elf_link_hash_entry *h;
3336
for (n = t->deps; n != NULL; n = n->next)
3339
/* Add a symbol representing this version. */
3341
if (! (_bfd_generic_link_add_one_symbol
3342
(info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
3343
(bfd_vma) 0, (const char *) NULL, false,
3344
get_elf_backend_data (dynobj)->collect,
3345
(struct bfd_link_hash_entry **) &h)))
3347
h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
3348
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3349
h->type = STT_OBJECT;
3350
h->verinfo.vertree = t;
3352
if (! _bfd_elf_link_record_dynamic_symbol (info, h))
3355
def.vd_version = VER_DEF_CURRENT;
3357
if (t->globals == NULL && t->locals == NULL && ! t->used)
3358
def.vd_flags |= VER_FLG_WEAK;
3359
def.vd_ndx = t->vernum + 1;
3360
def.vd_cnt = cdeps + 1;
3361
def.vd_hash = bfd_elf_hash (t->name);
3362
def.vd_aux = sizeof (Elf_External_Verdef);
3363
if (t->next != NULL)
3364
def.vd_next = (sizeof (Elf_External_Verdef)
3365
+ (cdeps + 1) * sizeof (Elf_External_Verdaux));
3369
_bfd_elf_swap_verdef_out (output_bfd, &def,
3370
(Elf_External_Verdef *) p);
3371
p += sizeof (Elf_External_Verdef);
3373
defaux.vda_name = h->dynstr_index;
3374
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3376
if (t->deps == NULL)
3377
defaux.vda_next = 0;
3379
defaux.vda_next = sizeof (Elf_External_Verdaux);
3380
t->name_indx = defaux.vda_name;
3382
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3383
(Elf_External_Verdaux *) p);
3384
p += sizeof (Elf_External_Verdaux);
3386
for (n = t->deps; n != NULL; n = n->next)
3388
if (n->version_needed == NULL)
3390
/* This can happen if there was an error in the
3392
defaux.vda_name = 0;
3396
defaux.vda_name = n->version_needed->name_indx;
3397
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3400
if (n->next == NULL)
3401
defaux.vda_next = 0;
3403
defaux.vda_next = sizeof (Elf_External_Verdaux);
3405
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3406
(Elf_External_Verdaux *) p);
3407
p += sizeof (Elf_External_Verdaux);
3411
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERDEF, (bfd_vma) 0)
3412
|| ! elf_add_dynamic_entry (info, (bfd_vma) DT_VERDEFNUM,
3416
elf_tdata (output_bfd)->cverdefs = cdefs;
3419
if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
3421
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FLAGS, info->flags))
3428
info->flags_1 &= ~ (DF_1_INITFIRST
3431
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FLAGS_1,
3436
/* Work out the size of the version reference section. */
3438
s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3439
BFD_ASSERT (s != NULL);
3441
struct elf_find_verdep_info sinfo;
3443
sinfo.output_bfd = output_bfd;
3445
sinfo.vers = elf_tdata (output_bfd)->cverdefs;
3446
if (sinfo.vers == 0)
3448
sinfo.failed = false;
3450
elf_link_hash_traverse (elf_hash_table (info),
3451
elf_link_find_version_dependencies,
3454
if (elf_tdata (output_bfd)->verref == NULL)
3455
_bfd_strip_section_from_output (info, s);
3458
Elf_Internal_Verneed *t;
3463
/* Build the version definition section. */
3466
for (t = elf_tdata (output_bfd)->verref;
3470
Elf_Internal_Vernaux *a;
3472
size += sizeof (Elf_External_Verneed);
3474
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3475
size += sizeof (Elf_External_Vernaux);
3478
s->_raw_size = size;
3479
s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3480
if (s->contents == NULL)
3484
for (t = elf_tdata (output_bfd)->verref;
3489
Elf_Internal_Vernaux *a;
3493
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3496
t->vn_version = VER_NEED_CURRENT;
3498
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3499
elf_dt_name (t->vn_bfd) != NULL
3500
? elf_dt_name (t->vn_bfd)
3501
: basename (t->vn_bfd->filename),
3503
if (indx == (bfd_size_type) -1)
3506
t->vn_aux = sizeof (Elf_External_Verneed);
3507
if (t->vn_nextref == NULL)
3510
t->vn_next = (sizeof (Elf_External_Verneed)
3511
+ caux * sizeof (Elf_External_Vernaux));
3513
_bfd_elf_swap_verneed_out (output_bfd, t,
3514
(Elf_External_Verneed *) p);
3515
p += sizeof (Elf_External_Verneed);
3517
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3519
a->vna_hash = bfd_elf_hash (a->vna_nodename);
3520
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3521
a->vna_nodename, false);
3522
if (indx == (bfd_size_type) -1)
3525
if (a->vna_nextptr == NULL)
3528
a->vna_next = sizeof (Elf_External_Vernaux);
3530
_bfd_elf_swap_vernaux_out (output_bfd, a,
3531
(Elf_External_Vernaux *) p);
3532
p += sizeof (Elf_External_Vernaux);
3536
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERNEED,
3538
|| ! elf_add_dynamic_entry (info, (bfd_vma) DT_VERNEEDNUM,
3542
elf_tdata (output_bfd)->cverrefs = crefs;
3546
/* Assign dynsym indicies. In a shared library we generate a
3547
section symbol for each output section, which come first.
3548
Next come all of the back-end allocated local dynamic syms,
3549
followed by the rest of the global symbols. */
3551
dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3553
/* Work out the size of the symbol version section. */
3554
s = bfd_get_section_by_name (dynobj, ".gnu.version");
3555
BFD_ASSERT (s != NULL);
3556
if (dynsymcount == 0
3557
|| (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
3559
_bfd_strip_section_from_output (info, s);
3560
/* The DYNSYMCOUNT might have changed if we were going to
3561
output a dynamic symbol table entry for S. */
3562
dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3566
s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
3567
s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3568
if (s->contents == NULL)
3571
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERSYM, (bfd_vma) 0))
3575
/* Set the size of the .dynsym and .hash sections. We counted
3576
the number of dynamic symbols in elf_link_add_object_symbols.
3577
We will build the contents of .dynsym and .hash when we build
3578
the final symbol table, because until then we do not know the
3579
correct value to give the symbols. We built the .dynstr
3580
section as we went along in elf_link_add_object_symbols. */
3581
s = bfd_get_section_by_name (dynobj, ".dynsym");
3582
BFD_ASSERT (s != NULL);
3583
s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
3584
s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3585
if (s->contents == NULL && s->_raw_size != 0)
3588
if (dynsymcount != 0)
3590
Elf_Internal_Sym isym;
3592
/* The first entry in .dynsym is a dummy symbol. */
3599
elf_swap_symbol_out (output_bfd, &isym, (PTR) s->contents, (PTR) 0);
3602
/* Compute the size of the hashing table. As a side effect this
3603
computes the hash values for all the names we export. */
3604
bucketcount = compute_bucket_count (info);
3606
s = bfd_get_section_by_name (dynobj, ".hash");
3607
BFD_ASSERT (s != NULL);
3608
hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
3609
s->_raw_size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
3610
s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3611
if (s->contents == NULL)
3614
bfd_put (8 * hash_entry_size, output_bfd, (bfd_vma) bucketcount,
3616
bfd_put (8 * hash_entry_size, output_bfd, (bfd_vma) dynsymcount,
3617
s->contents + hash_entry_size);
3619
elf_hash_table (info)->bucketcount = bucketcount;
3621
s = bfd_get_section_by_name (dynobj, ".dynstr");
3622
BFD_ASSERT (s != NULL);
3624
elf_finalize_dynstr (output_bfd, info);
3626
s->_raw_size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
3628
for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
3629
if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NULL, (bfd_vma) 0))
3636
/* This function is used to adjust offsets into .dynstr for
3637
dynamic symbols. This is called via elf_link_hash_traverse. */
3639
static boolean elf_adjust_dynstr_offsets
3640
PARAMS ((struct elf_link_hash_entry *, PTR));
3643
elf_adjust_dynstr_offsets (h, data)
3644
struct elf_link_hash_entry *h;
3647
struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3649
if (h->root.type == bfd_link_hash_warning)
3650
h = (struct elf_link_hash_entry *) h->root.u.i.link;
3652
if (h->dynindx != -1)
3653
h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3657
/* Assign string offsets in .dynstr, update all structures referencing
3661
elf_finalize_dynstr (output_bfd, info)
3663
struct bfd_link_info *info;
3665
struct elf_link_local_dynamic_entry *entry;
3666
struct elf_strtab_hash *dynstr = elf_hash_table (info)->dynstr;
3667
bfd *dynobj = elf_hash_table (info)->dynobj;
3670
Elf_External_Dyn *dyncon, *dynconend;
3672
_bfd_elf_strtab_finalize (dynstr);
3673
size = _bfd_elf_strtab_size (dynstr);
3675
/* Update all .dynamic entries referencing .dynstr strings. */
3676
sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3677
BFD_ASSERT (sdyn != NULL);
3679
dyncon = (Elf_External_Dyn *) sdyn->contents;
3680
dynconend = (Elf_External_Dyn *) (sdyn->contents +
3682
for (; dyncon < dynconend; dyncon++)
3684
Elf_Internal_Dyn dyn;
3686
elf_swap_dyn_in (dynobj, dyncon, & dyn);
3690
dyn.d_un.d_val = size;
3691
elf_swap_dyn_out (dynobj, & dyn, dyncon);
3699
dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3700
elf_swap_dyn_out (dynobj, & dyn, dyncon);
3707
/* Now update local dynamic symbols. */
3708
for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
3709
entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3710
entry->isym.st_name);
3712
/* And the rest of dynamic symbols. */
3713
elf_link_hash_traverse (elf_hash_table (info),
3714
elf_adjust_dynstr_offsets, dynstr);
3716
/* Adjust version definitions. */
3717
if (elf_tdata (output_bfd)->cverdefs)
3722
Elf_Internal_Verdef def;
3723
Elf_Internal_Verdaux defaux;
3725
s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3726
p = (bfd_byte *) s->contents;
3729
_bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3731
p += sizeof (Elf_External_Verdef);
3732
for (i = 0; i < def.vd_cnt; ++i)
3734
_bfd_elf_swap_verdaux_in (output_bfd,
3735
(Elf_External_Verdaux *) p, &defaux);
3736
defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3738
_bfd_elf_swap_verdaux_out (output_bfd,
3739
&defaux, (Elf_External_Verdaux *) p);
3740
p += sizeof (Elf_External_Verdaux);
3743
while (def.vd_next);
3746
/* Adjust version references. */
3747
if (elf_tdata (output_bfd)->verref)
3752
Elf_Internal_Verneed need;
3753
Elf_Internal_Vernaux needaux;
3755
s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3756
p = (bfd_byte *) s->contents;
3759
_bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3761
need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3762
_bfd_elf_swap_verneed_out (output_bfd, &need,
3763
(Elf_External_Verneed *) p);
3764
p += sizeof (Elf_External_Verneed);
3765
for (i = 0; i < need.vn_cnt; ++i)
3767
_bfd_elf_swap_vernaux_in (output_bfd,
3768
(Elf_External_Vernaux *) p, &needaux);
3769
needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3771
_bfd_elf_swap_vernaux_out (output_bfd,
3773
(Elf_External_Vernaux *) p);
3774
p += sizeof (Elf_External_Vernaux);
3777
while (need.vn_next);
3783
/* Fix up the flags for a symbol. This handles various cases which
3784
can only be fixed after all the input files are seen. This is
3785
currently called by both adjust_dynamic_symbol and
3786
assign_sym_version, which is unnecessary but perhaps more robust in
3787
the face of future changes. */
3790
elf_fix_symbol_flags (h, eif)
3791
struct elf_link_hash_entry *h;
3792
struct elf_info_failed *eif;
3794
/* If this symbol was mentioned in a non-ELF file, try to set
3795
DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3796
permit a non-ELF file to correctly refer to a symbol defined in
3797
an ELF dynamic object. */
3798
if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
3800
while (h->root.type == bfd_link_hash_indirect)
3801
h = (struct elf_link_hash_entry *) h->root.u.i.link;
3803
if (h->root.type != bfd_link_hash_defined
3804
&& h->root.type != bfd_link_hash_defweak)
3805
h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3806
| ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3809
if (h->root.u.def.section->owner != NULL
3810
&& (bfd_get_flavour (h->root.u.def.section->owner)
3811
== bfd_target_elf_flavour))
3812
h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3813
| ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3815
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3818
if (h->dynindx == -1
3819
&& ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3820
|| (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
3822
if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3831
/* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3832
was first seen in a non-ELF file. Fortunately, if the symbol
3833
was first seen in an ELF file, we're probably OK unless the
3834
symbol was defined in a non-ELF file. Catch that case here.
3835
FIXME: We're still in trouble if the symbol was first seen in
3836
a dynamic object, and then later in a non-ELF regular object. */
3837
if ((h->root.type == bfd_link_hash_defined
3838
|| h->root.type == bfd_link_hash_defweak)
3839
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3840
&& (h->root.u.def.section->owner != NULL
3841
? (bfd_get_flavour (h->root.u.def.section->owner)
3842
!= bfd_target_elf_flavour)
3843
: (bfd_is_abs_section (h->root.u.def.section)
3844
&& (h->elf_link_hash_flags
3845
& ELF_LINK_HASH_DEF_DYNAMIC) == 0)))
3846
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3849
/* If this is a final link, and the symbol was defined as a common
3850
symbol in a regular object file, and there was no definition in
3851
any dynamic object, then the linker will have allocated space for
3852
the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3853
flag will not have been set. */
3854
if (h->root.type == bfd_link_hash_defined
3855
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3856
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
3857
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3858
&& (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
3859
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3861
/* If -Bsymbolic was used (which means to bind references to global
3862
symbols to the definition within the shared object), and this
3863
symbol was defined in a regular object, then it actually doesn't
3864
need a PLT entry, and we can accomplish that by forcing it local.
3865
Likewise, if the symbol has hidden or internal visibility.
3866
FIXME: It might be that we also do not need a PLT for other
3867
non-hidden visibilities, but we would have to tell that to the
3868
backend specifically; we can't just clear PLT-related data here. */
3869
if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
3870
&& eif->info->shared
3871
&& is_elf_hash_table (eif->info)
3872
&& (eif->info->symbolic
3873
|| ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3874
|| ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
3875
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3877
struct elf_backend_data *bed;
3878
boolean force_local;
3880
bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3882
force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3883
|| ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
3884
(*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
3887
/* If this is a weak defined symbol in a dynamic object, and we know
3888
the real definition in the dynamic object, copy interesting flags
3889
over to the real definition. */
3890
if (h->weakdef != NULL)
3892
struct elf_link_hash_entry *weakdef;
3894
BFD_ASSERT (h->root.type == bfd_link_hash_defined
3895
|| h->root.type == bfd_link_hash_defweak);
3896
weakdef = h->weakdef;
3897
BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
3898
|| weakdef->root.type == bfd_link_hash_defweak);
3899
BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
3901
/* If the real definition is defined by a regular object file,
3902
don't do anything special. See the longer description in
3903
elf_adjust_dynamic_symbol, below. */
3904
if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3908
struct elf_backend_data *bed;
3910
bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3911
(*bed->elf_backend_copy_indirect_symbol) (weakdef, h);
3918
/* Make the backend pick a good value for a dynamic symbol. This is
3919
called via elf_link_hash_traverse, and also calls itself
3923
elf_adjust_dynamic_symbol (h, data)
3924
struct elf_link_hash_entry *h;
3927
struct elf_info_failed *eif = (struct elf_info_failed *) data;
3929
struct elf_backend_data *bed;
3931
if (h->root.type == bfd_link_hash_warning)
3933
h->plt.offset = (bfd_vma) -1;
3934
h->got.offset = (bfd_vma) -1;
3936
/* When warning symbols are created, they **replace** the "real"
3937
entry in the hash table, thus we never get to see the real
3938
symbol in a hash traversal. So look at it now. */
3939
h = (struct elf_link_hash_entry *) h->root.u.i.link;
3942
/* Ignore indirect symbols. These are added by the versioning code. */
3943
if (h->root.type == bfd_link_hash_indirect)
3946
if (! is_elf_hash_table (eif->info))
3949
/* Fix the symbol flags. */
3950
if (! elf_fix_symbol_flags (h, eif))
3953
/* If this symbol does not require a PLT entry, and it is not
3954
defined by a dynamic object, or is not referenced by a regular
3955
object, ignore it. We do have to handle a weak defined symbol,
3956
even if no regular object refers to it, if we decided to add it
3957
to the dynamic symbol table. FIXME: Do we normally need to worry
3958
about symbols which are defined by one dynamic object and
3959
referenced by another one? */
3960
if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
3961
&& ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3962
|| (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3963
|| ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
3964
&& (h->weakdef == NULL || h->weakdef->dynindx == -1))))
3966
h->plt.offset = (bfd_vma) -1;
3970
/* If we've already adjusted this symbol, don't do it again. This
3971
can happen via a recursive call. */
3972
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
3975
/* Don't look at this symbol again. Note that we must set this
3976
after checking the above conditions, because we may look at a
3977
symbol once, decide not to do anything, and then get called
3978
recursively later after REF_REGULAR is set below. */
3979
h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
3981
/* If this is a weak definition, and we know a real definition, and
3982
the real symbol is not itself defined by a regular object file,
3983
then get a good value for the real definition. We handle the
3984
real symbol first, for the convenience of the backend routine.
3986
Note that there is a confusing case here. If the real definition
3987
is defined by a regular object file, we don't get the real symbol
3988
from the dynamic object, but we do get the weak symbol. If the
3989
processor backend uses a COPY reloc, then if some routine in the
3990
dynamic object changes the real symbol, we will not see that
3991
change in the corresponding weak symbol. This is the way other
3992
ELF linkers work as well, and seems to be a result of the shared
3995
I will clarify this issue. Most SVR4 shared libraries define the
3996
variable _timezone and define timezone as a weak synonym. The
3997
tzset call changes _timezone. If you write
3998
extern int timezone;
4000
int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
4001
you might expect that, since timezone is a synonym for _timezone,
4002
the same number will print both times. However, if the processor
4003
backend uses a COPY reloc, then actually timezone will be copied
4004
into your process image, and, since you define _timezone
4005
yourself, _timezone will not. Thus timezone and _timezone will
4006
wind up at different memory locations. The tzset call will set
4007
_timezone, leaving timezone unchanged. */
4009
if (h->weakdef != NULL)
4011
/* If we get to this point, we know there is an implicit
4012
reference by a regular object file via the weak symbol H.
4013
FIXME: Is this really true? What if the traversal finds
4014
H->WEAKDEF before it finds H? */
4015
h->weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
4017
if (! elf_adjust_dynamic_symbol (h->weakdef, (PTR) eif))
4021
/* If a symbol has no type and no size and does not require a PLT
4022
entry, then we are probably about to do the wrong thing here: we
4023
are probably going to create a COPY reloc for an empty object.
4024
This case can arise when a shared object is built with assembly
4025
code, and the assembly code fails to set the symbol type. */
4027
&& h->type == STT_NOTYPE
4028
&& (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0)
4029
(*_bfd_error_handler)
4030
(_("warning: type and size of dynamic symbol `%s' are not defined"),
4031
h->root.root.string);
4033
dynobj = elf_hash_table (eif->info)->dynobj;
4034
bed = get_elf_backend_data (dynobj);
4035
if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
4044
/* This routine is used to export all defined symbols into the dynamic
4045
symbol table. It is called via elf_link_hash_traverse. */
4048
elf_export_symbol (h, data)
4049
struct elf_link_hash_entry *h;
4052
struct elf_info_failed *eif = (struct elf_info_failed *) data;
4054
/* Ignore indirect symbols. These are added by the versioning code. */
4055
if (h->root.type == bfd_link_hash_indirect)
4058
if (h->root.type == bfd_link_hash_warning)
4059
h = (struct elf_link_hash_entry *) h->root.u.i.link;
4061
if (h->dynindx == -1
4062
&& (h->elf_link_hash_flags
4063
& (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
4065
struct bfd_elf_version_tree *t;
4066
struct bfd_elf_version_expr *d;
4068
for (t = eif->verdefs; t != NULL; t = t->next)
4070
if (t->globals != NULL)
4072
for (d = t->globals; d != NULL; d = d->next)
4074
if ((*d->match) (d, h->root.root.string))
4079
if (t->locals != NULL)
4081
for (d = t->locals ; d != NULL; d = d->next)
4083
if ((*d->match) (d, h->root.root.string))
4092
if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
4103
/* Look through the symbols which are defined in other shared
4104
libraries and referenced here. Update the list of version
4105
dependencies. This will be put into the .gnu.version_r section.
4106
This function is called via elf_link_hash_traverse. */
4109
elf_link_find_version_dependencies (h, data)
4110
struct elf_link_hash_entry *h;
4113
struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
4114
Elf_Internal_Verneed *t;
4115
Elf_Internal_Vernaux *a;
4118
if (h->root.type == bfd_link_hash_warning)
4119
h = (struct elf_link_hash_entry *) h->root.u.i.link;
4121
/* We only care about symbols defined in shared objects with version
4123
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
4124
|| (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
4126
|| h->verinfo.verdef == NULL)
4129
/* See if we already know about this version. */
4130
for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
4132
if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
4135
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4136
if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
4142
/* This is a new version. Add it to tree we are building. */
4147
t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, amt);
4150
rinfo->failed = true;
4154
t->vn_bfd = h->verinfo.verdef->vd_bfd;
4155
t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
4156
elf_tdata (rinfo->output_bfd)->verref = t;
4160
a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, amt);
4162
/* Note that we are copying a string pointer here, and testing it
4163
above. If bfd_elf_string_from_elf_section is ever changed to
4164
discard the string data when low in memory, this will have to be
4166
a->vna_nodename = h->verinfo.verdef->vd_nodename;
4168
a->vna_flags = h->verinfo.verdef->vd_flags;
4169
a->vna_nextptr = t->vn_auxptr;
4171
h->verinfo.verdef->vd_exp_refno = rinfo->vers;
4174
a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
4181
/* Figure out appropriate versions for all the symbols. We may not
4182
have the version number script until we have read all of the input
4183
files, so until that point we don't know which symbols should be
4184
local. This function is called via elf_link_hash_traverse. */
4187
elf_link_assign_sym_version (h, data)
4188
struct elf_link_hash_entry *h;
4191
struct elf_assign_sym_version_info *sinfo;
4192
struct bfd_link_info *info;
4193
struct elf_backend_data *bed;
4194
struct elf_info_failed eif;
4198
sinfo = (struct elf_assign_sym_version_info *) data;
4201
if (h->root.type == bfd_link_hash_warning)
4202
h = (struct elf_link_hash_entry *) h->root.u.i.link;
4204
/* Fix the symbol flags. */
4207
if (! elf_fix_symbol_flags (h, &eif))
4210
sinfo->failed = true;
4214
/* We only need version numbers for symbols defined in regular
4216
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
4219
bed = get_elf_backend_data (sinfo->output_bfd);
4220
p = strchr (h->root.root.string, ELF_VER_CHR);
4221
if (p != NULL && h->verinfo.vertree == NULL)
4223
struct bfd_elf_version_tree *t;
4228
/* There are two consecutive ELF_VER_CHR characters if this is
4229
not a hidden symbol. */
4231
if (*p == ELF_VER_CHR)
4237
/* If there is no version string, we can just return out. */
4241
h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
4245
/* Look for the version. If we find it, it is no longer weak. */
4246
for (t = sinfo->verdefs; t != NULL; t = t->next)
4248
if (strcmp (t->name, p) == 0)
4252
struct bfd_elf_version_expr *d;
4254
len = p - h->root.root.string;
4255
alc = bfd_malloc ((bfd_size_type) len);
4258
memcpy (alc, h->root.root.string, len - 1);
4259
alc[len - 1] = '\0';
4260
if (alc[len - 2] == ELF_VER_CHR)
4261
alc[len - 2] = '\0';
4263
h->verinfo.vertree = t;
4267
if (t->globals != NULL)
4269
for (d = t->globals; d != NULL; d = d->next)
4270
if ((*d->match) (d, alc))
4274
/* See if there is anything to force this symbol to
4276
if (d == NULL && t->locals != NULL)
4278
for (d = t->locals; d != NULL; d = d->next)
4280
if ((*d->match) (d, alc))
4282
if (h->dynindx != -1
4284
&& ! info->export_dynamic)
4286
(*bed->elf_backend_hide_symbol) (info, h, true);
4299
/* If we are building an application, we need to create a
4300
version node for this version. */
4301
if (t == NULL && ! info->shared)
4303
struct bfd_elf_version_tree **pp;
4306
/* If we aren't going to export this symbol, we don't need
4307
to worry about it. */
4308
if (h->dynindx == -1)
4312
t = ((struct bfd_elf_version_tree *)
4313
bfd_alloc (sinfo->output_bfd, amt));
4316
sinfo->failed = true;
4325
t->name_indx = (unsigned int) -1;
4329
/* Don't count anonymous version tag. */
4330
if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0)
4332
for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
4334
t->vernum = version_index;
4338
h->verinfo.vertree = t;
4342
/* We could not find the version for a symbol when
4343
generating a shared archive. Return an error. */
4344
(*_bfd_error_handler)
4345
(_("%s: undefined versioned symbol name %s"),
4346
bfd_get_filename (sinfo->output_bfd), h->root.root.string);
4347
bfd_set_error (bfd_error_bad_value);
4349
sinfo->failed = true;
4354
h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
4357
/* If we don't have a version for this symbol, see if we can find
4359
if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
4361
struct bfd_elf_version_tree *t;
4362
struct bfd_elf_version_tree *local_ver;
4363
struct bfd_elf_version_expr *d;
4365
/* See if can find what version this symbol is in. If the
4366
symbol is supposed to be local, then don't actually register
4369
for (t = sinfo->verdefs; t != NULL; t = t->next)
4371
if (t->globals != NULL)
4373
for (d = t->globals; d != NULL; d = d->next)
4375
if ((*d->match) (d, h->root.root.string))
4377
h->verinfo.vertree = t;
4387
if (t->locals != NULL)
4389
for (d = t->locals; d != NULL; d = d->next)
4391
/* If the match is "*", keep looking for a more
4392
explicit, perhaps even global, match. */
4393
if (d->pattern[0] == '*' && d->pattern[1] == '\0')
4395
else if ((*d->match) (d, h->root.root.string))
4407
if (local_ver != NULL)
4409
h->verinfo.vertree = local_ver;
4410
if (h->dynindx != -1
4412
&& ! info->export_dynamic)
4414
(*bed->elf_backend_hide_symbol) (info, h, true);
4418
/* We need to check if a hidden versioned definition should
4419
hide the default one. */
4420
if (h->dynindx != -1 && h->verinfo.vertree != NULL)
4422
const char *verstr, *name;
4423
size_t namelen, verlen, newlen;
4425
struct elf_link_hash_entry *newh;
4427
name = h->root.root.string;
4428
namelen = strlen (name);
4429
verstr = h->verinfo.vertree->name;
4430
verlen = strlen (verstr);
4431
newlen = namelen + verlen + 2;
4433
newname = (char *) bfd_malloc ((bfd_size_type) newlen);
4434
if (newname == NULL)
4436
memcpy (newname, name, namelen);
4438
/* Check the hidden versioned definition. */
4439
p = newname + namelen;
4441
memcpy (p, verstr, verlen + 1);
4442
newh = elf_link_hash_lookup (elf_hash_table (info), newname,
4443
false, false, false);
4446
&& (newh->root.type == bfd_link_hash_defined
4447
|| newh->root.type == bfd_link_hash_defweak))
4448
/* We found a hidden versioned definition. Hide the
4450
(*bed->elf_backend_hide_symbol) (info, h, true);
4459
/* Final phase of ELF linker. */
4461
/* A structure we use to avoid passing large numbers of arguments. */
4463
struct elf_final_link_info
4465
/* General link information. */
4466
struct bfd_link_info *info;
4469
/* Symbol string table. */
4470
struct bfd_strtab_hash *symstrtab;
4471
/* .dynsym section. */
4472
asection *dynsym_sec;
4473
/* .hash section. */
4475
/* symbol version section (.gnu.version). */
4476
asection *symver_sec;
4477
/* first SHF_TLS section (if any). */
4478
asection *first_tls_sec;
4479
/* Buffer large enough to hold contents of any section. */
4481
/* Buffer large enough to hold external relocs of any section. */
4482
PTR external_relocs;
4483
/* Buffer large enough to hold internal relocs of any section. */
4484
Elf_Internal_Rela *internal_relocs;
4485
/* Buffer large enough to hold external local symbols of any input
4487
Elf_External_Sym *external_syms;
4488
/* And a buffer for symbol section indices. */
4489
Elf_External_Sym_Shndx *locsym_shndx;
4490
/* Buffer large enough to hold internal local symbols of any input
4492
Elf_Internal_Sym *internal_syms;
4493
/* Array large enough to hold a symbol index for each local symbol
4494
of any input BFD. */
4496
/* Array large enough to hold a section pointer for each local
4497
symbol of any input BFD. */
4498
asection **sections;
4499
/* Buffer to hold swapped out symbols. */
4500
Elf_External_Sym *symbuf;
4501
/* And one for symbol section indices. */
4502
Elf_External_Sym_Shndx *symshndxbuf;
4503
/* Number of swapped out symbols in buffer. */
4504
size_t symbuf_count;
4505
/* Number of symbols which fit in symbuf. */
4509
static boolean elf_link_output_sym
4510
PARAMS ((struct elf_final_link_info *, const char *,
4511
Elf_Internal_Sym *, asection *));
4512
static boolean elf_link_flush_output_syms
4513
PARAMS ((struct elf_final_link_info *));
4514
static boolean elf_link_output_extsym
4515
PARAMS ((struct elf_link_hash_entry *, PTR));
4516
static boolean elf_link_sec_merge_syms
4517
PARAMS ((struct elf_link_hash_entry *, PTR));
4518
static boolean elf_link_check_versioned_symbol
4519
PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
4520
static boolean elf_link_input_bfd
4521
PARAMS ((struct elf_final_link_info *, bfd *));
4522
static boolean elf_reloc_link_order
4523
PARAMS ((bfd *, struct bfd_link_info *, asection *,
4524
struct bfd_link_order *));
4526
/* This struct is used to pass information to elf_link_output_extsym. */
4528
struct elf_outext_info
4532
struct elf_final_link_info *finfo;
4535
/* Compute the size of, and allocate space for, REL_HDR which is the
4536
section header for a section containing relocations for O. */
4539
elf_link_size_reloc_section (abfd, rel_hdr, o)
4541
Elf_Internal_Shdr *rel_hdr;
4544
bfd_size_type reloc_count;
4545
bfd_size_type num_rel_hashes;
4547
/* Figure out how many relocations there will be. */
4548
if (rel_hdr == &elf_section_data (o)->rel_hdr)
4549
reloc_count = elf_section_data (o)->rel_count;
4551
reloc_count = elf_section_data (o)->rel_count2;
4553
num_rel_hashes = o->reloc_count;
4554
if (num_rel_hashes < reloc_count)
4555
num_rel_hashes = reloc_count;
4557
/* That allows us to calculate the size of the section. */
4558
rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
4560
/* The contents field must last into write_object_contents, so we
4561
allocate it with bfd_alloc rather than malloc. Also since we
4562
cannot be sure that the contents will actually be filled in,
4563
we zero the allocated space. */
4564
rel_hdr->contents = (PTR) bfd_zalloc (abfd, rel_hdr->sh_size);
4565
if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
4568
/* We only allocate one set of hash entries, so we only do it the
4569
first time we are called. */
4570
if (elf_section_data (o)->rel_hashes == NULL
4573
struct elf_link_hash_entry **p;
4575
p = ((struct elf_link_hash_entry **)
4576
bfd_zmalloc (num_rel_hashes
4577
* sizeof (struct elf_link_hash_entry *)));
4581
elf_section_data (o)->rel_hashes = p;
4587
/* When performing a relocateable link, the input relocations are
4588
preserved. But, if they reference global symbols, the indices
4589
referenced must be updated. Update all the relocations in
4590
REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4593
elf_link_adjust_relocs (abfd, rel_hdr, count, rel_hash)
4595
Elf_Internal_Shdr *rel_hdr;
4597
struct elf_link_hash_entry **rel_hash;
4600
struct elf_backend_data *bed = get_elf_backend_data (abfd);
4601
Elf_Internal_Rel *irel;
4602
Elf_Internal_Rela *irela;
4603
bfd_size_type amt = sizeof (Elf_Internal_Rel) * bed->s->int_rels_per_ext_rel;
4605
irel = (Elf_Internal_Rel *) bfd_zmalloc (amt);
4608
(*_bfd_error_handler) (_("Error: out of memory"));
4612
amt = sizeof (Elf_Internal_Rela) * bed->s->int_rels_per_ext_rel;
4613
irela = (Elf_Internal_Rela *) bfd_zmalloc (amt);
4616
(*_bfd_error_handler) (_("Error: out of memory"));
4620
for (i = 0; i < count; i++, rel_hash++)
4622
if (*rel_hash == NULL)
4625
BFD_ASSERT ((*rel_hash)->indx >= 0);
4627
if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
4629
Elf_External_Rel *erel;
4632
erel = (Elf_External_Rel *) rel_hdr->contents + i;
4633
if (bed->s->swap_reloc_in)
4634
(*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
4636
elf_swap_reloc_in (abfd, erel, irel);
4638
for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4639
irel[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4640
ELF_R_TYPE (irel[j].r_info));
4642
if (bed->s->swap_reloc_out)
4643
(*bed->s->swap_reloc_out) (abfd, irel, (bfd_byte *) erel);
4645
elf_swap_reloc_out (abfd, irel, erel);
4649
Elf_External_Rela *erela;
4652
BFD_ASSERT (rel_hdr->sh_entsize
4653
== sizeof (Elf_External_Rela));
4655
erela = (Elf_External_Rela *) rel_hdr->contents + i;
4656
if (bed->s->swap_reloca_in)
4657
(*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
4659
elf_swap_reloca_in (abfd, erela, irela);
4661
for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4662
irela[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4663
ELF_R_TYPE (irela[j].r_info));
4665
if (bed->s->swap_reloca_out)
4666
(*bed->s->swap_reloca_out) (abfd, irela, (bfd_byte *) erela);
4668
elf_swap_reloca_out (abfd, irela, erela);
4676
struct elf_link_sort_rela
4679
enum elf_reloc_type_class type;
4682
Elf_Internal_Rel rel;
4683
Elf_Internal_Rela rela;
4688
elf_link_sort_cmp1 (A, B)
4692
struct elf_link_sort_rela *a = (struct elf_link_sort_rela *) A;
4693
struct elf_link_sort_rela *b = (struct elf_link_sort_rela *) B;
4694
int relativea, relativeb;
4696
relativea = a->type == reloc_class_relative;
4697
relativeb = b->type == reloc_class_relative;
4699
if (relativea < relativeb)
4701
if (relativea > relativeb)
4703
if (ELF_R_SYM (a->u.rel.r_info) < ELF_R_SYM (b->u.rel.r_info))
4705
if (ELF_R_SYM (a->u.rel.r_info) > ELF_R_SYM (b->u.rel.r_info))
4707
if (a->u.rel.r_offset < b->u.rel.r_offset)
4709
if (a->u.rel.r_offset > b->u.rel.r_offset)
4715
elf_link_sort_cmp2 (A, B)
4719
struct elf_link_sort_rela *a = (struct elf_link_sort_rela *) A;
4720
struct elf_link_sort_rela *b = (struct elf_link_sort_rela *) B;
4723
if (a->offset < b->offset)
4725
if (a->offset > b->offset)
4727
copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
4728
copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
4733
if (a->u.rel.r_offset < b->u.rel.r_offset)
4735
if (a->u.rel.r_offset > b->u.rel.r_offset)
4741
elf_link_sort_relocs (abfd, info, psec)
4743
struct bfd_link_info *info;
4746
bfd *dynobj = elf_hash_table (info)->dynobj;
4747
asection *reldyn, *o;
4748
boolean rel = false;
4749
bfd_size_type count, size;
4751
struct elf_link_sort_rela *rela;
4752
struct elf_backend_data *bed = get_elf_backend_data (abfd);
4754
reldyn = bfd_get_section_by_name (abfd, ".rela.dyn");
4755
if (reldyn == NULL || reldyn->_raw_size == 0)
4757
reldyn = bfd_get_section_by_name (abfd, ".rel.dyn");
4758
if (reldyn == NULL || reldyn->_raw_size == 0)
4761
count = reldyn->_raw_size / sizeof (Elf_External_Rel);
4764
count = reldyn->_raw_size / sizeof (Elf_External_Rela);
4767
for (o = dynobj->sections; o != NULL; o = o->next)
4768
if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4769
== (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4770
&& o->output_section == reldyn)
4771
size += o->_raw_size;
4773
if (size != reldyn->_raw_size)
4776
rela = (struct elf_link_sort_rela *) bfd_zmalloc (sizeof (*rela) * count);
4779
(*info->callbacks->warning)
4780
(info, _("Not enough memory to sort relocations"), 0, abfd, 0,
4785
for (o = dynobj->sections; o != NULL; o = o->next)
4786
if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4787
== (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4788
&& o->output_section == reldyn)
4792
Elf_External_Rel *erel, *erelend;
4793
struct elf_link_sort_rela *s;
4795
erel = (Elf_External_Rel *) o->contents;
4796
erelend = (Elf_External_Rel *) (o->contents + o->_raw_size);
4797
s = rela + o->output_offset / sizeof (Elf_External_Rel);
4798
for (; erel < erelend; erel++, s++)
4800
if (bed->s->swap_reloc_in)
4801
(*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, &s->u.rel);
4803
elf_swap_reloc_in (abfd, erel, &s->u.rel);
4805
s->type = (*bed->elf_backend_reloc_type_class) (&s->u.rela);
4810
Elf_External_Rela *erela, *erelaend;
4811
struct elf_link_sort_rela *s;
4813
erela = (Elf_External_Rela *) o->contents;
4814
erelaend = (Elf_External_Rela *) (o->contents + o->_raw_size);
4815
s = rela + o->output_offset / sizeof (Elf_External_Rela);
4816
for (; erela < erelaend; erela++, s++)
4818
if (bed->s->swap_reloca_in)
4819
(*bed->s->swap_reloca_in) (dynobj, (bfd_byte *) erela,
4822
elf_swap_reloca_in (dynobj, erela, &s->u.rela);
4824
s->type = (*bed->elf_backend_reloc_type_class) (&s->u.rela);
4829
qsort (rela, (size_t) count, sizeof (*rela), elf_link_sort_cmp1);
4830
for (ret = 0; ret < count && rela[ret].type == reloc_class_relative; ret++)
4832
for (i = ret, j = ret; i < count; i++)
4834
if (ELF_R_SYM (rela[i].u.rel.r_info) != ELF_R_SYM (rela[j].u.rel.r_info))
4836
rela[i].offset = rela[j].u.rel.r_offset;
4838
qsort (rela + ret, (size_t) count - ret, sizeof (*rela), elf_link_sort_cmp2);
4840
for (o = dynobj->sections; o != NULL; o = o->next)
4841
if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4842
== (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4843
&& o->output_section == reldyn)
4847
Elf_External_Rel *erel, *erelend;
4848
struct elf_link_sort_rela *s;
4850
erel = (Elf_External_Rel *) o->contents;
4851
erelend = (Elf_External_Rel *) (o->contents + o->_raw_size);
4852
s = rela + o->output_offset / sizeof (Elf_External_Rel);
4853
for (; erel < erelend; erel++, s++)
4855
if (bed->s->swap_reloc_out)
4856
(*bed->s->swap_reloc_out) (abfd, &s->u.rel,
4859
elf_swap_reloc_out (abfd, &s->u.rel, erel);
4864
Elf_External_Rela *erela, *erelaend;
4865
struct elf_link_sort_rela *s;
4867
erela = (Elf_External_Rela *) o->contents;
4868
erelaend = (Elf_External_Rela *) (o->contents + o->_raw_size);
4869
s = rela + o->output_offset / sizeof (Elf_External_Rela);
4870
for (; erela < erelaend; erela++, s++)
4872
if (bed->s->swap_reloca_out)
4873
(*bed->s->swap_reloca_out) (dynobj, &s->u.rela,
4874
(bfd_byte *) erela);
4876
elf_swap_reloca_out (dynobj, &s->u.rela, erela);
4886
/* Do the final step of an ELF link. */
4889
elf_bfd_final_link (abfd, info)
4891
struct bfd_link_info *info;
4894
boolean emit_relocs;
4896
struct elf_final_link_info finfo;
4897
register asection *o;
4898
register struct bfd_link_order *p;
4900
bfd_size_type max_contents_size;
4901
bfd_size_type max_external_reloc_size;
4902
bfd_size_type max_internal_reloc_count;
4903
bfd_size_type max_sym_count;
4904
bfd_size_type max_sym_shndx_count;
4906
Elf_Internal_Sym elfsym;
4908
Elf_Internal_Shdr *symtab_hdr;
4909
Elf_Internal_Shdr *symstrtab_hdr;
4910
struct elf_backend_data *bed = get_elf_backend_data (abfd);
4911
struct elf_outext_info eoinfo;
4913
size_t relativecount = 0;
4914
asection *reldyn = 0;
4917
if (! is_elf_hash_table (info))
4921
abfd->flags |= DYNAMIC;
4923
dynamic = elf_hash_table (info)->dynamic_sections_created;
4924
dynobj = elf_hash_table (info)->dynobj;
4926
emit_relocs = (info->relocateable
4927
|| info->emitrelocations
4928
|| bed->elf_backend_emit_relocs);
4931
finfo.output_bfd = abfd;
4932
finfo.symstrtab = elf_stringtab_init ();
4933
if (finfo.symstrtab == NULL)
4938
finfo.dynsym_sec = NULL;
4939
finfo.hash_sec = NULL;
4940
finfo.symver_sec = NULL;
4944
finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
4945
finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
4946
BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
4947
finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
4948
/* Note that it is OK if symver_sec is NULL. */
4951
finfo.contents = NULL;
4952
finfo.external_relocs = NULL;
4953
finfo.internal_relocs = NULL;
4954
finfo.external_syms = NULL;
4955
finfo.locsym_shndx = NULL;
4956
finfo.internal_syms = NULL;
4957
finfo.indices = NULL;
4958
finfo.sections = NULL;
4959
finfo.symbuf = NULL;
4960
finfo.symshndxbuf = NULL;
4961
finfo.symbuf_count = 0;
4962
finfo.first_tls_sec = NULL;
4963
for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4964
if ((o->flags & SEC_THREAD_LOCAL) != 0
4965
&& (o->flags & SEC_LOAD) != 0)
4967
finfo.first_tls_sec = o;
4971
/* Count up the number of relocations we will output for each output
4972
section, so that we know the sizes of the reloc sections. We
4973
also figure out some maximum sizes. */
4974
max_contents_size = 0;
4975
max_external_reloc_size = 0;
4976
max_internal_reloc_count = 0;
4978
max_sym_shndx_count = 0;
4980
for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4984
for (p = o->link_order_head; p != NULL; p = p->next)
4986
if (p->type == bfd_section_reloc_link_order
4987
|| p->type == bfd_symbol_reloc_link_order)
4989
else if (p->type == bfd_indirect_link_order)
4993
sec = p->u.indirect.section;
4995
/* Mark all sections which are to be included in the
4996
link. This will normally be every section. We need
4997
to do this so that we can identify any sections which
4998
the linker has decided to not include. */
4999
sec->linker_mark = true;
5001
if (sec->flags & SEC_MERGE)
5004
if (info->relocateable || info->emitrelocations)
5005
o->reloc_count += sec->reloc_count;
5006
else if (bed->elf_backend_count_relocs)
5008
Elf_Internal_Rela * relocs;
5010
relocs = (NAME(_bfd_elf,link_read_relocs)
5011
(abfd, sec, (PTR) NULL,
5012
(Elf_Internal_Rela *) NULL, info->keep_memory));
5015
+= (*bed->elf_backend_count_relocs) (sec, relocs);
5017
if (elf_section_data (o)->relocs != relocs)
5021
if (sec->_raw_size > max_contents_size)
5022
max_contents_size = sec->_raw_size;
5023
if (sec->_cooked_size > max_contents_size)
5024
max_contents_size = sec->_cooked_size;
5026
/* We are interested in just local symbols, not all
5028
if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
5029
&& (sec->owner->flags & DYNAMIC) == 0)
5033
if (elf_bad_symtab (sec->owner))
5034
sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
5035
/ sizeof (Elf_External_Sym));
5037
sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
5039
if (sym_count > max_sym_count)
5040
max_sym_count = sym_count;
5042
if (sym_count > max_sym_shndx_count
5043
&& elf_symtab_shndx (sec->owner) != 0)
5044
max_sym_shndx_count = sym_count;
5046
if ((sec->flags & SEC_RELOC) != 0)
5050
ext_size = elf_section_data (sec)->rel_hdr.sh_size;
5051
if (ext_size > max_external_reloc_size)
5052
max_external_reloc_size = ext_size;
5053
if (sec->reloc_count > max_internal_reloc_count)
5054
max_internal_reloc_count = sec->reloc_count;
5060
if (o->reloc_count > 0)
5061
o->flags |= SEC_RELOC;
5064
/* Explicitly clear the SEC_RELOC flag. The linker tends to
5065
set it (this is probably a bug) and if it is set
5066
assign_section_numbers will create a reloc section. */
5067
o->flags &=~ SEC_RELOC;
5070
/* If the SEC_ALLOC flag is not set, force the section VMA to
5071
zero. This is done in elf_fake_sections as well, but forcing
5072
the VMA to 0 here will ensure that relocs against these
5073
sections are handled correctly. */
5074
if ((o->flags & SEC_ALLOC) == 0
5075
&& ! o->user_set_vma)
5079
if (! info->relocateable && merged)
5080
elf_link_hash_traverse (elf_hash_table (info),
5081
elf_link_sec_merge_syms, (PTR) abfd);
5083
/* Figure out the file positions for everything but the symbol table
5084
and the relocs. We set symcount to force assign_section_numbers
5085
to create a symbol table. */
5086
bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
5087
BFD_ASSERT (! abfd->output_has_begun);
5088
if (! _bfd_elf_compute_section_file_positions (abfd, info))
5091
/* Figure out how many relocations we will have in each section.
5092
Just using RELOC_COUNT isn't good enough since that doesn't
5093
maintain a separate value for REL vs. RELA relocations. */
5095
for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
5096
for (o = sub->sections; o != NULL; o = o->next)
5098
asection *output_section;
5100
if (! o->linker_mark)
5102
/* This section was omitted from the link. */
5106
output_section = o->output_section;
5108
if (output_section != NULL
5109
&& (o->flags & SEC_RELOC) != 0)
5111
struct bfd_elf_section_data *esdi
5112
= elf_section_data (o);
5113
struct bfd_elf_section_data *esdo
5114
= elf_section_data (output_section);
5115
unsigned int *rel_count;
5116
unsigned int *rel_count2;
5117
bfd_size_type entsize;
5118
bfd_size_type entsize2;
5120
/* We must be careful to add the relocations from the
5121
input section to the right output count. */
5122
entsize = esdi->rel_hdr.sh_entsize;
5123
entsize2 = esdi->rel_hdr2 ? esdi->rel_hdr2->sh_entsize : 0;
5124
BFD_ASSERT ((entsize == sizeof (Elf_External_Rel)
5125
|| entsize == sizeof (Elf_External_Rela))
5126
&& entsize2 != entsize
5128
|| entsize2 == sizeof (Elf_External_Rel)
5129
|| entsize2 == sizeof (Elf_External_Rela)));
5130
if (entsize == esdo->rel_hdr.sh_entsize)
5132
rel_count = &esdo->rel_count;
5133
rel_count2 = &esdo->rel_count2;
5137
rel_count = &esdo->rel_count2;
5138
rel_count2 = &esdo->rel_count;
5141
*rel_count += NUM_SHDR_ENTRIES (& esdi->rel_hdr);
5143
*rel_count2 += NUM_SHDR_ENTRIES (esdi->rel_hdr2);
5144
output_section->flags |= SEC_RELOC;
5148
/* That created the reloc sections. Set their sizes, and assign
5149
them file positions, and allocate some buffers. */
5150
for (o = abfd->sections; o != NULL; o = o->next)
5152
if ((o->flags & SEC_RELOC) != 0)
5154
if (!elf_link_size_reloc_section (abfd,
5155
&elf_section_data (o)->rel_hdr,
5159
if (elf_section_data (o)->rel_hdr2
5160
&& !elf_link_size_reloc_section (abfd,
5161
elf_section_data (o)->rel_hdr2,
5166
/* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
5167
to count upwards while actually outputting the relocations. */
5168
elf_section_data (o)->rel_count = 0;
5169
elf_section_data (o)->rel_count2 = 0;
5172
_bfd_elf_assign_file_positions_for_relocs (abfd);
5174
/* We have now assigned file positions for all the sections except
5175
.symtab and .strtab. We start the .symtab section at the current
5176
file position, and write directly to it. We build the .strtab
5177
section in memory. */
5178
bfd_get_symcount (abfd) = 0;
5179
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
5180
/* sh_name is set in prep_headers. */
5181
symtab_hdr->sh_type = SHT_SYMTAB;
5182
symtab_hdr->sh_flags = 0;
5183
symtab_hdr->sh_addr = 0;
5184
symtab_hdr->sh_size = 0;
5185
symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
5186
/* sh_link is set in assign_section_numbers. */
5187
/* sh_info is set below. */
5188
/* sh_offset is set just below. */
5189
symtab_hdr->sh_addralign = bed->s->file_align;
5191
off = elf_tdata (abfd)->next_file_pos;
5192
off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
5194
/* Note that at this point elf_tdata (abfd)->next_file_pos is
5195
incorrect. We do not yet know the size of the .symtab section.
5196
We correct next_file_pos below, after we do know the size. */
5198
/* Allocate a buffer to hold swapped out symbols. This is to avoid
5199
continuously seeking to the right position in the file. */
5200
if (! info->keep_memory || max_sym_count < 20)
5201
finfo.symbuf_size = 20;
5203
finfo.symbuf_size = max_sym_count;
5204
amt = finfo.symbuf_size;
5205
amt *= sizeof (Elf_External_Sym);
5206
finfo.symbuf = (Elf_External_Sym *) bfd_malloc (amt);
5207
if (finfo.symbuf == NULL)
5209
if (elf_numsections (abfd) > SHN_LORESERVE)
5211
amt = finfo.symbuf_size;
5212
amt *= sizeof (Elf_External_Sym_Shndx);
5213
finfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
5214
if (finfo.symshndxbuf == NULL)
5218
/* Start writing out the symbol table. The first symbol is always a
5220
if (info->strip != strip_all
5223
elfsym.st_value = 0;
5226
elfsym.st_other = 0;
5227
elfsym.st_shndx = SHN_UNDEF;
5228
if (! elf_link_output_sym (&finfo, (const char *) NULL,
5229
&elfsym, bfd_und_section_ptr))
5234
/* Some standard ELF linkers do this, but we don't because it causes
5235
bootstrap comparison failures. */
5236
/* Output a file symbol for the output file as the second symbol.
5237
We output this even if we are discarding local symbols, although
5238
I'm not sure if this is correct. */
5239
elfsym.st_value = 0;
5241
elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
5242
elfsym.st_other = 0;
5243
elfsym.st_shndx = SHN_ABS;
5244
if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
5245
&elfsym, bfd_abs_section_ptr))
5249
/* Output a symbol for each section. We output these even if we are
5250
discarding local symbols, since they are used for relocs. These
5251
symbols have no names. We store the index of each one in the
5252
index field of the section, so that we can find it again when
5253
outputting relocs. */
5254
if (info->strip != strip_all
5258
elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
5259
elfsym.st_other = 0;
5260
for (i = 1; i < elf_numsections (abfd); i++)
5262
o = section_from_elf_index (abfd, i);
5264
o->target_index = bfd_get_symcount (abfd);
5265
elfsym.st_shndx = i;
5266
if (info->relocateable || o == NULL)
5267
elfsym.st_value = 0;
5269
elfsym.st_value = o->vma;
5270
if (! elf_link_output_sym (&finfo, (const char *) NULL,
5273
if (i == SHN_LORESERVE)
5274
i += SHN_HIRESERVE + 1 - SHN_LORESERVE;
5278
/* Allocate some memory to hold information read in from the input
5280
if (max_contents_size != 0)
5282
finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
5283
if (finfo.contents == NULL)
5287
if (max_external_reloc_size != 0)
5289
finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
5290
if (finfo.external_relocs == NULL)
5294
if (max_internal_reloc_count != 0)
5296
amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
5297
amt *= sizeof (Elf_Internal_Rela);
5298
finfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
5299
if (finfo.internal_relocs == NULL)
5303
if (max_sym_count != 0)
5305
amt = max_sym_count * sizeof (Elf_External_Sym);
5306
finfo.external_syms = (Elf_External_Sym *) bfd_malloc (amt);
5307
if (finfo.external_syms == NULL)
5310
amt = max_sym_count * sizeof (Elf_Internal_Sym);
5311
finfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
5312
if (finfo.internal_syms == NULL)
5315
amt = max_sym_count * sizeof (long);
5316
finfo.indices = (long *) bfd_malloc (amt);
5317
if (finfo.indices == NULL)
5320
amt = max_sym_count * sizeof (asection *);
5321
finfo.sections = (asection **) bfd_malloc (amt);
5322
if (finfo.sections == NULL)
5326
if (max_sym_shndx_count != 0)
5328
amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
5329
finfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
5330
if (finfo.locsym_shndx == NULL)
5334
if (finfo.first_tls_sec)
5336
unsigned int align = 0;
5337
bfd_vma base = finfo.first_tls_sec->vma, end = 0;
5340
for (sec = finfo.first_tls_sec;
5341
sec && (sec->flags & SEC_THREAD_LOCAL);
5344
bfd_vma size = sec->_raw_size;
5346
if (bfd_get_section_alignment (abfd, sec) > align)
5347
align = bfd_get_section_alignment (abfd, sec);
5348
if (sec->_raw_size == 0 && (sec->flags & SEC_HAS_CONTENTS) == 0)
5350
struct bfd_link_order *o;
5353
for (o = sec->link_order_head; o != NULL; o = o->next)
5354
if (size < o->offset + o->size)
5355
size = o->offset + o->size;
5357
end = sec->vma + size;
5359
elf_hash_table (info)->tls_segment
5360
= bfd_zalloc (abfd, sizeof (struct elf_link_tls_segment));
5361
if (elf_hash_table (info)->tls_segment == NULL)
5363
elf_hash_table (info)->tls_segment->start = base;
5364
elf_hash_table (info)->tls_segment->size = end - base;
5365
elf_hash_table (info)->tls_segment->align = align;
5368
/* Since ELF permits relocations to be against local symbols, we
5369
must have the local symbols available when we do the relocations.
5370
Since we would rather only read the local symbols once, and we
5371
would rather not keep them in memory, we handle all the
5372
relocations for a single input file at the same time.
5374
Unfortunately, there is no way to know the total number of local
5375
symbols until we have seen all of them, and the local symbol
5376
indices precede the global symbol indices. This means that when
5377
we are generating relocateable output, and we see a reloc against
5378
a global symbol, we can not know the symbol index until we have
5379
finished examining all the local symbols to see which ones we are
5380
going to output. To deal with this, we keep the relocations in
5381
memory, and don't output them until the end of the link. This is
5382
an unfortunate waste of memory, but I don't see a good way around
5383
it. Fortunately, it only happens when performing a relocateable
5384
link, which is not the common case. FIXME: If keep_memory is set
5385
we could write the relocs out and then read them again; I don't
5386
know how bad the memory loss will be. */
5388
for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
5389
sub->output_has_begun = false;
5390
for (o = abfd->sections; o != NULL; o = o->next)
5392
for (p = o->link_order_head; p != NULL; p = p->next)
5394
if (p->type == bfd_indirect_link_order
5395
&& (bfd_get_flavour ((sub = p->u.indirect.section->owner))
5396
== bfd_target_elf_flavour)
5397
&& elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
5399
if (! sub->output_has_begun)
5401
if (! elf_link_input_bfd (&finfo, sub))
5403
sub->output_has_begun = true;
5406
else if (p->type == bfd_section_reloc_link_order
5407
|| p->type == bfd_symbol_reloc_link_order)
5409
if (! elf_reloc_link_order (abfd, info, o, p))
5414
if (! _bfd_default_link_order (abfd, info, o, p))
5420
/* Output any global symbols that got converted to local in a
5421
version script or due to symbol visibility. We do this in a
5422
separate step since ELF requires all local symbols to appear
5423
prior to any global symbols. FIXME: We should only do this if
5424
some global symbols were, in fact, converted to become local.
5425
FIXME: Will this work correctly with the Irix 5 linker? */
5426
eoinfo.failed = false;
5427
eoinfo.finfo = &finfo;
5428
eoinfo.localsyms = true;
5429
elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
5434
/* That wrote out all the local symbols. Finish up the symbol table
5435
with the global symbols. Even if we want to strip everything we
5436
can, we still need to deal with those global symbols that got
5437
converted to local in a version script. */
5439
/* The sh_info field records the index of the first non local symbol. */
5440
symtab_hdr->sh_info = bfd_get_symcount (abfd);
5443
&& finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
5445
Elf_Internal_Sym sym;
5446
Elf_External_Sym *dynsym =
5447
(Elf_External_Sym *) finfo.dynsym_sec->contents;
5448
long last_local = 0;
5450
/* Write out the section symbols for the output sections. */
5457
sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
5460
for (s = abfd->sections; s != NULL; s = s->next)
5463
Elf_External_Sym *dest;
5465
indx = elf_section_data (s)->this_idx;
5466
BFD_ASSERT (indx > 0);
5467
sym.st_shndx = indx;
5468
sym.st_value = s->vma;
5469
dest = dynsym + elf_section_data (s)->dynindx;
5470
elf_swap_symbol_out (abfd, &sym, (PTR) dest, (PTR) 0);
5473
last_local = bfd_count_sections (abfd);
5476
/* Write out the local dynsyms. */
5477
if (elf_hash_table (info)->dynlocal)
5479
struct elf_link_local_dynamic_entry *e;
5480
for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
5483
Elf_External_Sym *dest;
5485
sym.st_size = e->isym.st_size;
5486
sym.st_other = e->isym.st_other;
5488
/* Copy the internal symbol as is.
5489
Note that we saved a word of storage and overwrote
5490
the original st_name with the dynstr_index. */
5493
if (e->isym.st_shndx != SHN_UNDEF
5494
&& (e->isym.st_shndx < SHN_LORESERVE
5495
|| e->isym.st_shndx > SHN_HIRESERVE))
5497
s = bfd_section_from_elf_index (e->input_bfd,
5501
elf_section_data (s->output_section)->this_idx;
5502
sym.st_value = (s->output_section->vma
5504
+ e->isym.st_value);
5507
if (last_local < e->dynindx)
5508
last_local = e->dynindx;
5510
dest = dynsym + e->dynindx;
5511
elf_swap_symbol_out (abfd, &sym, (PTR) dest, (PTR) 0);
5515
elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
5519
/* We get the global symbols from the hash table. */
5520
eoinfo.failed = false;
5521
eoinfo.localsyms = false;
5522
eoinfo.finfo = &finfo;
5523
elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
5528
/* If backend needs to output some symbols not present in the hash
5529
table, do it now. */
5530
if (bed->elf_backend_output_arch_syms)
5532
typedef boolean (*out_sym_func) PARAMS ((PTR, const char *,
5536
if (! ((*bed->elf_backend_output_arch_syms)
5537
(abfd, info, (PTR) &finfo, (out_sym_func) elf_link_output_sym)))
5541
/* Flush all symbols to the file. */
5542
if (! elf_link_flush_output_syms (&finfo))
5545
/* Now we know the size of the symtab section. */
5546
off += symtab_hdr->sh_size;
5548
/* Finish up and write out the symbol string table (.strtab)
5550
symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
5551
/* sh_name was set in prep_headers. */
5552
symstrtab_hdr->sh_type = SHT_STRTAB;
5553
symstrtab_hdr->sh_flags = 0;
5554
symstrtab_hdr->sh_addr = 0;
5555
symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
5556
symstrtab_hdr->sh_entsize = 0;
5557
symstrtab_hdr->sh_link = 0;
5558
symstrtab_hdr->sh_info = 0;
5559
/* sh_offset is set just below. */
5560
symstrtab_hdr->sh_addralign = 1;
5562
off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
5563
elf_tdata (abfd)->next_file_pos = off;
5565
if (bfd_get_symcount (abfd) > 0)
5567
if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
5568
|| ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
5572
/* Adjust the relocs to have the correct symbol indices. */
5573
for (o = abfd->sections; o != NULL; o = o->next)
5575
if ((o->flags & SEC_RELOC) == 0)
5578
elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
5579
elf_section_data (o)->rel_count,
5580
elf_section_data (o)->rel_hashes);
5581
if (elf_section_data (o)->rel_hdr2 != NULL)
5582
elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
5583
elf_section_data (o)->rel_count2,
5584
(elf_section_data (o)->rel_hashes
5585
+ elf_section_data (o)->rel_count));
5587
/* Set the reloc_count field to 0 to prevent write_relocs from
5588
trying to swap the relocs out itself. */
5592
if (dynamic && info->combreloc && dynobj != NULL)
5593
relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
5595
/* If we are linking against a dynamic object, or generating a
5596
shared library, finish up the dynamic linking information. */
5599
Elf_External_Dyn *dyncon, *dynconend;
5601
/* Fix up .dynamic entries. */
5602
o = bfd_get_section_by_name (dynobj, ".dynamic");
5603
BFD_ASSERT (o != NULL);
5605
dyncon = (Elf_External_Dyn *) o->contents;
5606
dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
5607
for (; dyncon < dynconend; dyncon++)
5609
Elf_Internal_Dyn dyn;
5613
elf_swap_dyn_in (dynobj, dyncon, &dyn);
5620
if (relativecount > 0 && dyncon + 1 < dynconend)
5622
switch (elf_section_data (reldyn)->this_hdr.sh_type)
5624
case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
5625
case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
5628
if (dyn.d_tag != DT_NULL)
5630
dyn.d_un.d_val = relativecount;
5631
elf_swap_dyn_out (dynobj, &dyn, dyncon);
5637
name = info->init_function;
5640
name = info->fini_function;
5643
struct elf_link_hash_entry *h;
5645
h = elf_link_hash_lookup (elf_hash_table (info), name,
5646
false, false, true);
5648
&& (h->root.type == bfd_link_hash_defined
5649
|| h->root.type == bfd_link_hash_defweak))
5651
dyn.d_un.d_val = h->root.u.def.value;
5652
o = h->root.u.def.section;
5653
if (o->output_section != NULL)
5654
dyn.d_un.d_val += (o->output_section->vma
5655
+ o->output_offset);
5658
/* The symbol is imported from another shared
5659
library and does not apply to this one. */
5663
elf_swap_dyn_out (dynobj, &dyn, dyncon);
5668
case DT_PREINIT_ARRAYSZ:
5669
name = ".preinit_array";
5671
case DT_INIT_ARRAYSZ:
5672
name = ".init_array";
5674
case DT_FINI_ARRAYSZ:
5675
name = ".fini_array";
5677
o = bfd_get_section_by_name (abfd, name);
5680
(*_bfd_error_handler)
5681
(_("%s: could not find output section %s"),
5682
bfd_get_filename (abfd), name);
5685
if (o->_raw_size == 0)
5686
(*_bfd_error_handler)
5687
(_("warning: %s section has zero size"), name);
5688
dyn.d_un.d_val = o->_raw_size;
5689
elf_swap_dyn_out (dynobj, &dyn, dyncon);
5692
case DT_PREINIT_ARRAY:
5693
name = ".preinit_array";
5696
name = ".init_array";
5699
name = ".fini_array";
5712
name = ".gnu.version_d";
5715
name = ".gnu.version_r";
5718
name = ".gnu.version";
5720
o = bfd_get_section_by_name (abfd, name);
5723
(*_bfd_error_handler)
5724
(_("%s: could not find output section %s"),
5725
bfd_get_filename (abfd), name);
5728
dyn.d_un.d_ptr = o->vma;
5729
elf_swap_dyn_out (dynobj, &dyn, dyncon);
5736
if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
5741
for (i = 1; i < elf_numsections (abfd); i++)
5743
Elf_Internal_Shdr *hdr;
5745
hdr = elf_elfsections (abfd)[i];
5746
if (hdr->sh_type == type
5747
&& (hdr->sh_flags & SHF_ALLOC) != 0)
5749
if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
5750
dyn.d_un.d_val += hdr->sh_size;
5753
if (dyn.d_un.d_val == 0
5754
|| hdr->sh_addr < dyn.d_un.d_val)
5755
dyn.d_un.d_val = hdr->sh_addr;
5759
elf_swap_dyn_out (dynobj, &dyn, dyncon);
5765
/* If we have created any dynamic sections, then output them. */
5768
if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
5771
for (o = dynobj->sections; o != NULL; o = o->next)
5773
if ((o->flags & SEC_HAS_CONTENTS) == 0
5774
|| o->_raw_size == 0
5775
|| o->output_section == bfd_abs_section_ptr)
5777
if ((o->flags & SEC_LINKER_CREATED) == 0)
5779
/* At this point, we are only interested in sections
5780
created by elf_link_create_dynamic_sections. */
5783
if ((elf_section_data (o->output_section)->this_hdr.sh_type
5785
|| strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
5787
if (! bfd_set_section_contents (abfd, o->output_section,
5789
(file_ptr) o->output_offset,
5795
/* The contents of the .dynstr section are actually in a
5797
off = elf_section_data (o->output_section)->this_hdr.sh_offset;
5798
if (bfd_seek (abfd, off, SEEK_SET) != 0
5799
|| ! _bfd_elf_strtab_emit (abfd,
5800
elf_hash_table (info)->dynstr))
5806
if (info->relocateable)
5808
boolean failed = false;
5810
bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
5815
/* If we have optimized stabs strings, output them. */
5816
if (elf_hash_table (info)->stab_info != NULL)
5818
if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
5822
if (info->eh_frame_hdr && elf_hash_table (info)->dynobj)
5824
o = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
5827
&& (elf_section_data (o)->sec_info_type
5828
== ELF_INFO_TYPE_EH_FRAME_HDR))
5830
if (! _bfd_elf_write_section_eh_frame_hdr (abfd, o))
5835
if (finfo.symstrtab != NULL)
5836
_bfd_stringtab_free (finfo.symstrtab);
5837
if (finfo.contents != NULL)
5838
free (finfo.contents);
5839
if (finfo.external_relocs != NULL)
5840
free (finfo.external_relocs);
5841
if (finfo.internal_relocs != NULL)
5842
free (finfo.internal_relocs);
5843
if (finfo.external_syms != NULL)
5844
free (finfo.external_syms);
5845
if (finfo.locsym_shndx != NULL)
5846
free (finfo.locsym_shndx);
5847
if (finfo.internal_syms != NULL)
5848
free (finfo.internal_syms);
5849
if (finfo.indices != NULL)
5850
free (finfo.indices);
5851
if (finfo.sections != NULL)
5852
free (finfo.sections);
5853
if (finfo.symbuf != NULL)
5854
free (finfo.symbuf);
5855
if (finfo.symshndxbuf != NULL)
5856
free (finfo.symbuf);
5857
for (o = abfd->sections; o != NULL; o = o->next)
5859
if ((o->flags & SEC_RELOC) != 0
5860
&& elf_section_data (o)->rel_hashes != NULL)
5861
free (elf_section_data (o)->rel_hashes);
5864
elf_tdata (abfd)->linker = true;
5869
if (finfo.symstrtab != NULL)
5870
_bfd_stringtab_free (finfo.symstrtab);
5871
if (finfo.contents != NULL)
5872
free (finfo.contents);
5873
if (finfo.external_relocs != NULL)
5874
free (finfo.external_relocs);
5875
if (finfo.internal_relocs != NULL)
5876
free (finfo.internal_relocs);
5877
if (finfo.external_syms != NULL)
5878
free (finfo.external_syms);
5879
if (finfo.locsym_shndx != NULL)
5880
free (finfo.locsym_shndx);
5881
if (finfo.internal_syms != NULL)
5882
free (finfo.internal_syms);
5883
if (finfo.indices != NULL)
5884
free (finfo.indices);
5885
if (finfo.sections != NULL)
5886
free (finfo.sections);
5887
if (finfo.symbuf != NULL)
5888
free (finfo.symbuf);
5889
if (finfo.symshndxbuf != NULL)
5890
free (finfo.symbuf);
5891
for (o = abfd->sections; o != NULL; o = o->next)
5893
if ((o->flags & SEC_RELOC) != 0
5894
&& elf_section_data (o)->rel_hashes != NULL)
5895
free (elf_section_data (o)->rel_hashes);
5901
/* Add a symbol to the output symbol table. */
5904
elf_link_output_sym (finfo, name, elfsym, input_sec)
5905
struct elf_final_link_info *finfo;
5907
Elf_Internal_Sym *elfsym;
5908
asection *input_sec;
5910
Elf_External_Sym *dest;
5911
Elf_External_Sym_Shndx *destshndx;
5913
boolean (*output_symbol_hook) PARAMS ((bfd *,
5914
struct bfd_link_info *info,
5919
output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
5920
elf_backend_link_output_symbol_hook;
5921
if (output_symbol_hook != NULL)
5923
if (! ((*output_symbol_hook)
5924
(finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
5928
if (name == (const char *) NULL || *name == '\0')
5929
elfsym->st_name = 0;
5930
else if (input_sec->flags & SEC_EXCLUDE)
5931
elfsym->st_name = 0;
5934
elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
5936
if (elfsym->st_name == (unsigned long) -1)
5940
if (finfo->symbuf_count >= finfo->symbuf_size)
5942
if (! elf_link_flush_output_syms (finfo))
5946
dest = finfo->symbuf + finfo->symbuf_count;
5947
destshndx = finfo->symshndxbuf;
5948
if (destshndx != NULL)
5949
destshndx += finfo->symbuf_count;
5950
elf_swap_symbol_out (finfo->output_bfd, elfsym, (PTR) dest, (PTR) destshndx);
5951
++finfo->symbuf_count;
5953
++ bfd_get_symcount (finfo->output_bfd);
5958
/* Flush the output symbols to the file. */
5961
elf_link_flush_output_syms (finfo)
5962
struct elf_final_link_info *finfo;
5964
if (finfo->symbuf_count > 0)
5966
Elf_Internal_Shdr *hdr;
5970
hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
5971
pos = hdr->sh_offset + hdr->sh_size;
5972
amt = finfo->symbuf_count * sizeof (Elf_External_Sym);
5973
if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
5974
|| bfd_bwrite ((PTR) finfo->symbuf, amt, finfo->output_bfd) != amt)
5977
hdr->sh_size += amt;
5979
if (finfo->symshndxbuf != NULL)
5981
hdr = &elf_tdata (finfo->output_bfd)->symtab_shndx_hdr;
5982
pos = hdr->sh_offset + hdr->sh_size;
5983
amt = finfo->symbuf_count * sizeof (Elf_External_Sym_Shndx);
5984
if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
5985
|| (bfd_bwrite ((PTR) finfo->symshndxbuf, amt, finfo->output_bfd)
5989
hdr->sh_size += amt;
5992
finfo->symbuf_count = 0;
5998
/* Adjust all external symbols pointing into SEC_MERGE sections
5999
to reflect the object merging within the sections. */
6002
elf_link_sec_merge_syms (h, data)
6003
struct elf_link_hash_entry *h;
6008
if (h->root.type == bfd_link_hash_warning)
6009
h = (struct elf_link_hash_entry *) h->root.u.i.link;
6011
if ((h->root.type == bfd_link_hash_defined
6012
|| h->root.type == bfd_link_hash_defweak)
6013
&& ((sec = h->root.u.def.section)->flags & SEC_MERGE)
6014
&& elf_section_data (sec)->sec_info_type == ELF_INFO_TYPE_MERGE)
6016
bfd *output_bfd = (bfd *) data;
6018
h->root.u.def.value =
6019
_bfd_merged_section_offset (output_bfd,
6020
&h->root.u.def.section,
6021
elf_section_data (sec)->sec_info,
6022
h->root.u.def.value, (bfd_vma) 0);
6028
/* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
6029
allowing an unsatisfied unversioned symbol in the DSO to match a
6030
versioned symbol that would normally require an explicit version. */
6033
elf_link_check_versioned_symbol (info, h)
6034
struct bfd_link_info *info;
6035
struct elf_link_hash_entry *h;
6037
bfd *undef_bfd = h->root.u.undef.abfd;
6038
struct elf_link_loaded_list *loaded;
6040
if ((undef_bfd->flags & DYNAMIC) == 0
6041
|| info->hash->creator->flavour != bfd_target_elf_flavour
6042
|| elf_dt_soname (h->root.u.undef.abfd) == NULL)
6045
for (loaded = elf_hash_table (info)->loaded;
6047
loaded = loaded->next)
6050
Elf_Internal_Shdr *hdr;
6051
bfd_size_type symcount;
6052
bfd_size_type extsymcount;
6053
bfd_size_type extsymoff;
6054
Elf_Internal_Shdr *versymhdr;
6055
Elf_Internal_Sym *isym;
6056
Elf_Internal_Sym *isymend;
6057
Elf_Internal_Sym *isymbuf;
6058
Elf_External_Versym *ever;
6059
Elf_External_Versym *extversym;
6061
input = loaded->abfd;
6063
/* We check each DSO for a possible hidden versioned definition. */
6064
if (input == undef_bfd
6065
|| (input->flags & DYNAMIC) == 0
6066
|| elf_dynversym (input) == 0)
6069
hdr = &elf_tdata (input)->dynsymtab_hdr;
6071
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
6072
if (elf_bad_symtab (input))
6074
extsymcount = symcount;
6079
extsymcount = symcount - hdr->sh_info;
6080
extsymoff = hdr->sh_info;
6083
if (extsymcount == 0)
6086
isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
6088
if (isymbuf == NULL)
6091
/* Read in any version definitions. */
6092
versymhdr = &elf_tdata (input)->dynversym_hdr;
6093
extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
6094
if (extversym == NULL)
6097
if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
6098
|| (bfd_bread ((PTR) extversym, versymhdr->sh_size, input)
6099
!= versymhdr->sh_size))
6107
ever = extversym + extsymoff;
6108
isymend = isymbuf + extsymcount;
6109
for (isym = isymbuf; isym < isymend; isym++, ever++)
6112
Elf_Internal_Versym iver;
6114
if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
6115
|| isym->st_shndx == SHN_UNDEF)
6118
name = bfd_elf_string_from_elf_section (input,
6121
if (strcmp (name, h->root.root.string) != 0)
6124
_bfd_elf_swap_versym_in (input, ever, &iver);
6126
if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
6128
/* If we have a non-hidden versioned sym, then it should
6129
have provided a definition for the undefined sym. */
6133
if ((iver.vs_vers & VERSYM_VERSION) == 2)
6135
/* This is the oldest (default) sym. We can use it. */
6149
/* Add an external symbol to the symbol table. This is called from
6150
the hash table traversal routine. When generating a shared object,
6151
we go through the symbol table twice. The first time we output
6152
anything that might have been forced to local scope in a version
6153
script. The second time we output the symbols that are still
6157
elf_link_output_extsym (h, data)
6158
struct elf_link_hash_entry *h;
6161
struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
6162
struct elf_final_link_info *finfo = eoinfo->finfo;
6164
Elf_Internal_Sym sym;
6165
asection *input_sec;
6167
if (h->root.type == bfd_link_hash_warning)
6169
h = (struct elf_link_hash_entry *) h->root.u.i.link;
6170
if (h->root.type == bfd_link_hash_new)
6174
/* Decide whether to output this symbol in this pass. */
6175
if (eoinfo->localsyms)
6177
if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6182
if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6186
/* If we are not creating a shared library, and this symbol is
6187
referenced by a shared library but is not defined anywhere, then
6188
warn that it is undefined. If we do not do this, the runtime
6189
linker will complain that the symbol is undefined when the
6190
program is run. We don't have to worry about symbols that are
6191
referenced by regular files, because we will already have issued
6192
warnings for them. */
6193
if (! finfo->info->relocateable
6194
&& ! finfo->info->allow_shlib_undefined
6195
&& ! finfo->info->shared
6196
&& h->root.type == bfd_link_hash_undefined
6197
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
6198
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
6199
&& ! elf_link_check_versioned_symbol (finfo->info, h))
6201
if (! ((*finfo->info->callbacks->undefined_symbol)
6202
(finfo->info, h->root.root.string, h->root.u.undef.abfd,
6203
(asection *) NULL, (bfd_vma) 0, true)))
6205
eoinfo->failed = true;
6210
/* We don't want to output symbols that have never been mentioned by
6211
a regular file, or that we have been told to strip. However, if
6212
h->indx is set to -2, the symbol is used by a reloc and we must
6216
else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
6217
|| (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
6218
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
6219
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
6221
else if (finfo->info->strip == strip_all
6222
|| (finfo->info->strip == strip_some
6223
&& bfd_hash_lookup (finfo->info->keep_hash,
6224
h->root.root.string,
6225
false, false) == NULL))
6230
/* If we're stripping it, and it's not a dynamic symbol, there's
6231
nothing else to do unless it is a forced local symbol. */
6234
&& (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6238
sym.st_size = h->size;
6239
sym.st_other = h->other;
6240
if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6241
sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
6242
else if (h->root.type == bfd_link_hash_undefweak
6243
|| h->root.type == bfd_link_hash_defweak)
6244
sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
6246
sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
6248
switch (h->root.type)
6251
case bfd_link_hash_new:
6252
case bfd_link_hash_warning:
6256
case bfd_link_hash_undefined:
6257
case bfd_link_hash_undefweak:
6258
input_sec = bfd_und_section_ptr;
6259
sym.st_shndx = SHN_UNDEF;
6262
case bfd_link_hash_defined:
6263
case bfd_link_hash_defweak:
6265
input_sec = h->root.u.def.section;
6266
if (input_sec->output_section != NULL)
6269
_bfd_elf_section_from_bfd_section (finfo->output_bfd,
6270
input_sec->output_section);
6271
if (sym.st_shndx == SHN_BAD)
6273
(*_bfd_error_handler)
6274
(_("%s: could not find output section %s for input section %s"),
6275
bfd_get_filename (finfo->output_bfd),
6276
input_sec->output_section->name,
6278
eoinfo->failed = true;
6282
/* ELF symbols in relocateable files are section relative,
6283
but in nonrelocateable files they are virtual
6285
sym.st_value = h->root.u.def.value + input_sec->output_offset;
6286
if (! finfo->info->relocateable)
6288
sym.st_value += input_sec->output_section->vma;
6289
if (h->type == STT_TLS)
6291
/* STT_TLS symbols are relative to PT_TLS segment
6293
BFD_ASSERT (finfo->first_tls_sec != NULL);
6294
sym.st_value -= finfo->first_tls_sec->vma;
6300
BFD_ASSERT (input_sec->owner == NULL
6301
|| (input_sec->owner->flags & DYNAMIC) != 0);
6302
sym.st_shndx = SHN_UNDEF;
6303
input_sec = bfd_und_section_ptr;
6308
case bfd_link_hash_common:
6309
input_sec = h->root.u.c.p->section;
6310
sym.st_shndx = SHN_COMMON;
6311
sym.st_value = 1 << h->root.u.c.p->alignment_power;
6314
case bfd_link_hash_indirect:
6315
/* These symbols are created by symbol versioning. They point
6316
to the decorated version of the name. For example, if the
6317
symbol foo@@GNU_1.2 is the default, which should be used when
6318
foo is used with no version, then we add an indirect symbol
6319
foo which points to foo@@GNU_1.2. We ignore these symbols,
6320
since the indirected symbol is already in the hash table. */
6324
/* Give the processor backend a chance to tweak the symbol value,
6325
and also to finish up anything that needs to be done for this
6326
symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6327
forced local syms when non-shared is due to a historical quirk. */
6328
if ((h->dynindx != -1
6329
|| (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6330
&& (finfo->info->shared
6331
|| (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6332
&& elf_hash_table (finfo->info)->dynamic_sections_created)
6334
struct elf_backend_data *bed;
6336
bed = get_elf_backend_data (finfo->output_bfd);
6337
if (! ((*bed->elf_backend_finish_dynamic_symbol)
6338
(finfo->output_bfd, finfo->info, h, &sym)))
6340
eoinfo->failed = true;
6345
/* If we are marking the symbol as undefined, and there are no
6346
non-weak references to this symbol from a regular object, then
6347
mark the symbol as weak undefined; if there are non-weak
6348
references, mark the symbol as strong. We can't do this earlier,
6349
because it might not be marked as undefined until the
6350
finish_dynamic_symbol routine gets through with it. */
6351
if (sym.st_shndx == SHN_UNDEF
6352
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
6353
&& (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
6354
|| ELF_ST_BIND (sym.st_info) == STB_WEAK))
6358
if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
6359
bindtype = STB_GLOBAL;
6361
bindtype = STB_WEAK;
6362
sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
6365
/* If a symbol is not defined locally, we clear the visibility
6367
if (! finfo->info->relocateable
6368
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6369
sym.st_other ^= ELF_ST_VISIBILITY (sym.st_other);
6371
/* If this symbol should be put in the .dynsym section, then put it
6372
there now. We already know the symbol index. We also fill in
6373
the entry in the .hash section. */
6374
if (h->dynindx != -1
6375
&& elf_hash_table (finfo->info)->dynamic_sections_created)
6379
size_t hash_entry_size;
6380
bfd_byte *bucketpos;
6382
Elf_External_Sym *esym;
6384
sym.st_name = h->dynstr_index;
6385
esym = (Elf_External_Sym *) finfo->dynsym_sec->contents + h->dynindx;
6386
elf_swap_symbol_out (finfo->output_bfd, &sym, (PTR) esym, (PTR) 0);
6388
bucketcount = elf_hash_table (finfo->info)->bucketcount;
6389
bucket = h->elf_hash_value % bucketcount;
6391
= elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
6392
bucketpos = ((bfd_byte *) finfo->hash_sec->contents
6393
+ (bucket + 2) * hash_entry_size);
6394
chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
6395
bfd_put (8 * hash_entry_size, finfo->output_bfd, (bfd_vma) h->dynindx,
6397
bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
6398
((bfd_byte *) finfo->hash_sec->contents
6399
+ (bucketcount + 2 + h->dynindx) * hash_entry_size));
6401
if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
6403
Elf_Internal_Versym iversym;
6404
Elf_External_Versym *eversym;
6406
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6408
if (h->verinfo.verdef == NULL)
6409
iversym.vs_vers = 0;
6411
iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
6415
if (h->verinfo.vertree == NULL)
6416
iversym.vs_vers = 1;
6418
iversym.vs_vers = h->verinfo.vertree->vernum + 1;
6421
if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
6422
iversym.vs_vers |= VERSYM_HIDDEN;
6424
eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
6425
eversym += h->dynindx;
6426
_bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
6430
/* If we're stripping it, then it was just a dynamic symbol, and
6431
there's nothing else to do. */
6435
h->indx = bfd_get_symcount (finfo->output_bfd);
6437
if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
6439
eoinfo->failed = true;
6446
/* Copy the relocations indicated by the INTERNAL_RELOCS (which
6447
originated from the section given by INPUT_REL_HDR) to the
6451
elf_link_output_relocs (output_bfd, input_section, input_rel_hdr,
6454
asection *input_section;
6455
Elf_Internal_Shdr *input_rel_hdr;
6456
Elf_Internal_Rela *internal_relocs;
6458
Elf_Internal_Rela *irela;
6459
Elf_Internal_Rela *irelaend;
6460
Elf_Internal_Shdr *output_rel_hdr;
6461
asection *output_section;
6462
unsigned int *rel_countp = NULL;
6463
struct elf_backend_data *bed;
6466
output_section = input_section->output_section;
6467
output_rel_hdr = NULL;
6469
if (elf_section_data (output_section)->rel_hdr.sh_entsize
6470
== input_rel_hdr->sh_entsize)
6472
output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
6473
rel_countp = &elf_section_data (output_section)->rel_count;
6475
else if (elf_section_data (output_section)->rel_hdr2
6476
&& (elf_section_data (output_section)->rel_hdr2->sh_entsize
6477
== input_rel_hdr->sh_entsize))
6479
output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
6480
rel_countp = &elf_section_data (output_section)->rel_count2;
6484
(*_bfd_error_handler)
6485
(_("%s: relocation size mismatch in %s section %s"),
6486
bfd_get_filename (output_bfd),
6487
bfd_archive_filename (input_section->owner),
6488
input_section->name);
6489
bfd_set_error (bfd_error_wrong_object_format);
6493
bed = get_elf_backend_data (output_bfd);
6494
irela = internal_relocs;
6495
irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
6496
* bed->s->int_rels_per_ext_rel);
6498
if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
6500
Elf_External_Rel *erel;
6501
Elf_Internal_Rel *irel;
6503
amt = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
6504
irel = (Elf_Internal_Rel *) bfd_zmalloc (amt);
6507
(*_bfd_error_handler) (_("Error: out of memory"));
6511
erel = ((Elf_External_Rel *) output_rel_hdr->contents + *rel_countp);
6512
for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erel++)
6516
for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
6518
irel[i].r_offset = irela[i].r_offset;
6519
irel[i].r_info = irela[i].r_info;
6520
BFD_ASSERT (irela[i].r_addend == 0);
6523
if (bed->s->swap_reloc_out)
6524
(*bed->s->swap_reloc_out) (output_bfd, irel, (PTR) erel);
6526
elf_swap_reloc_out (output_bfd, irel, erel);
6533
Elf_External_Rela *erela;
6535
BFD_ASSERT (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rela));
6537
erela = ((Elf_External_Rela *) output_rel_hdr->contents + *rel_countp);
6538
for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erela++)
6539
if (bed->s->swap_reloca_out)
6540
(*bed->s->swap_reloca_out) (output_bfd, irela, (PTR) erela);
6542
elf_swap_reloca_out (output_bfd, irela, erela);
6545
/* Bump the counter, so that we know where to add the next set of
6547
*rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr);
6552
/* Link an input file into the linker output file. This function
6553
handles all the sections and relocations of the input file at once.
6554
This is so that we only have to read the local symbols once, and
6555
don't have to keep them in memory. */
6558
elf_link_input_bfd (finfo, input_bfd)
6559
struct elf_final_link_info *finfo;
6562
boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
6563
bfd *, asection *, bfd_byte *,
6564
Elf_Internal_Rela *,
6565
Elf_Internal_Sym *, asection **));
6567
Elf_Internal_Shdr *symtab_hdr;
6570
Elf_Internal_Sym *isymbuf;
6571
Elf_Internal_Sym *isym;
6572
Elf_Internal_Sym *isymend;
6574
asection **ppsection;
6576
struct elf_backend_data *bed;
6577
boolean emit_relocs;
6578
struct elf_link_hash_entry **sym_hashes;
6580
output_bfd = finfo->output_bfd;
6581
bed = get_elf_backend_data (output_bfd);
6582
relocate_section = bed->elf_backend_relocate_section;
6584
/* If this is a dynamic object, we don't want to do anything here:
6585
we don't want the local symbols, and we don't want the section
6587
if ((input_bfd->flags & DYNAMIC) != 0)
6590
emit_relocs = (finfo->info->relocateable
6591
|| finfo->info->emitrelocations
6592
|| bed->elf_backend_emit_relocs);
6594
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
6595
if (elf_bad_symtab (input_bfd))
6597
locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6602
locsymcount = symtab_hdr->sh_info;
6603
extsymoff = symtab_hdr->sh_info;
6606
/* Read the local symbols. */
6607
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
6608
if (isymbuf == NULL && locsymcount != 0)
6610
isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
6611
finfo->internal_syms,
6612
finfo->external_syms,
6613
finfo->locsym_shndx);
6614
if (isymbuf == NULL)
6618
/* Find local symbol sections and adjust values of symbols in
6619
SEC_MERGE sections. Write out those local symbols we know are
6620
going into the output file. */
6621
isymend = isymbuf + locsymcount;
6622
for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections;
6624
isym++, pindex++, ppsection++)
6628
Elf_Internal_Sym osym;
6632
if (elf_bad_symtab (input_bfd))
6634
if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
6641
if (isym->st_shndx == SHN_UNDEF)
6642
isec = bfd_und_section_ptr;
6643
else if (isym->st_shndx < SHN_LORESERVE
6644
|| isym->st_shndx > SHN_HIRESERVE)
6646
isec = section_from_elf_index (input_bfd, isym->st_shndx);
6648
&& elf_section_data (isec)->sec_info_type == ELF_INFO_TYPE_MERGE
6649
&& ELF_ST_TYPE (isym->st_info) != STT_SECTION)
6651
_bfd_merged_section_offset (output_bfd, &isec,
6652
elf_section_data (isec)->sec_info,
6653
isym->st_value, (bfd_vma) 0);
6655
else if (isym->st_shndx == SHN_ABS)
6656
isec = bfd_abs_section_ptr;
6657
else if (isym->st_shndx == SHN_COMMON)
6658
isec = bfd_com_section_ptr;
6667
/* Don't output the first, undefined, symbol. */
6668
if (ppsection == finfo->sections)
6671
if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
6673
/* We never output section symbols. Instead, we use the
6674
section symbol of the corresponding section in the output
6679
/* If we are stripping all symbols, we don't want to output this
6681
if (finfo->info->strip == strip_all)
6684
/* If we are discarding all local symbols, we don't want to
6685
output this one. If we are generating a relocateable output
6686
file, then some of the local symbols may be required by
6687
relocs; we output them below as we discover that they are
6689
if (finfo->info->discard == discard_all)
6692
/* If this symbol is defined in a section which we are
6693
discarding, we don't need to keep it, but note that
6694
linker_mark is only reliable for sections that have contents.
6695
For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6696
as well as linker_mark. */
6697
if ((isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
6699
&& ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
6700
|| (! finfo->info->relocateable
6701
&& (isec->flags & SEC_EXCLUDE) != 0)))
6704
/* Get the name of the symbol. */
6705
name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
6710
/* See if we are discarding symbols with this name. */
6711
if ((finfo->info->strip == strip_some
6712
&& (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
6714
|| (((finfo->info->discard == discard_sec_merge
6715
&& (isec->flags & SEC_MERGE) && ! finfo->info->relocateable)
6716
|| finfo->info->discard == discard_l)
6717
&& bfd_is_local_label_name (input_bfd, name)))
6720
/* If we get here, we are going to output this symbol. */
6724
/* Adjust the section index for the output file. */
6725
osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
6726
isec->output_section);
6727
if (osym.st_shndx == SHN_BAD)
6730
*pindex = bfd_get_symcount (output_bfd);
6732
/* ELF symbols in relocateable files are section relative, but
6733
in executable files they are virtual addresses. Note that
6734
this code assumes that all ELF sections have an associated
6735
BFD section with a reasonable value for output_offset; below
6736
we assume that they also have a reasonable value for
6737
output_section. Any special sections must be set up to meet
6738
these requirements. */
6739
osym.st_value += isec->output_offset;
6740
if (! finfo->info->relocateable)
6742
osym.st_value += isec->output_section->vma;
6743
if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
6745
/* STT_TLS symbols are relative to PT_TLS segment base. */
6746
BFD_ASSERT (finfo->first_tls_sec != NULL);
6747
osym.st_value -= finfo->first_tls_sec->vma;
6751
if (! elf_link_output_sym (finfo, name, &osym, isec))
6755
/* Relocate the contents of each section. */
6756
sym_hashes = elf_sym_hashes (input_bfd);
6757
for (o = input_bfd->sections; o != NULL; o = o->next)
6761
if (! o->linker_mark)
6763
/* This section was omitted from the link. */
6767
if ((o->flags & SEC_HAS_CONTENTS) == 0
6768
|| (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
6771
if ((o->flags & SEC_LINKER_CREATED) != 0)
6773
/* Section was created by elf_link_create_dynamic_sections
6778
/* Get the contents of the section. They have been cached by a
6779
relaxation routine. Note that o is a section in an input
6780
file, so the contents field will not have been set by any of
6781
the routines which work on output files. */
6782
if (elf_section_data (o)->this_hdr.contents != NULL)
6783
contents = elf_section_data (o)->this_hdr.contents;
6786
contents = finfo->contents;
6787
if (! bfd_get_section_contents (input_bfd, o, contents,
6788
(file_ptr) 0, o->_raw_size))
6792
if ((o->flags & SEC_RELOC) != 0)
6794
Elf_Internal_Rela *internal_relocs;
6796
/* Get the swapped relocs. */
6797
internal_relocs = (NAME(_bfd_elf,link_read_relocs)
6798
(input_bfd, o, finfo->external_relocs,
6799
finfo->internal_relocs, false));
6800
if (internal_relocs == NULL
6801
&& o->reloc_count > 0)
6804
/* Run through the relocs looking for any against symbols
6805
from discarded sections and section symbols from
6806
removed link-once sections. Complain about relocs
6807
against discarded sections. Zero relocs against removed
6808
link-once sections. We should really complain if
6809
anything in the final link tries to use it, but
6810
DWARF-based exception handling might have an entry in
6811
.eh_frame to describe a routine in the linkonce section,
6812
and it turns out to be hard to remove the .eh_frame
6813
entry too. FIXME. */
6814
if (!finfo->info->relocateable
6815
&& !elf_section_ignore_discarded_relocs (o))
6817
Elf_Internal_Rela *rel, *relend;
6819
rel = internal_relocs;
6820
relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
6821
for ( ; rel < relend; rel++)
6823
unsigned long r_symndx = ELF_R_SYM (rel->r_info);
6825
if (r_symndx >= locsymcount
6826
|| (elf_bad_symtab (input_bfd)
6827
&& finfo->sections[r_symndx] == NULL))
6829
struct elf_link_hash_entry *h;
6831
h = sym_hashes[r_symndx - extsymoff];
6832
while (h->root.type == bfd_link_hash_indirect
6833
|| h->root.type == bfd_link_hash_warning)
6834
h = (struct elf_link_hash_entry *) h->root.u.i.link;
6836
/* Complain if the definition comes from a
6837
discarded section. */
6838
if ((h->root.type == bfd_link_hash_defined
6839
|| h->root.type == bfd_link_hash_defweak)
6840
&& elf_discarded_section (h->root.u.def.section))
6842
#if BFD_VERSION_DATE < 20031005
6843
if ((o->flags & SEC_DEBUGGING) != 0)
6845
#if BFD_VERSION_DATE > 20021005
6846
(*finfo->info->callbacks->warning)
6848
_("warning: relocation against removed section; zeroing"),
6849
NULL, input_bfd, o, rel->r_offset);
6851
BFD_ASSERT (r_symndx != 0);
6852
memset (rel, 0, sizeof (*rel));
6857
if (! ((*finfo->info->callbacks->undefined_symbol)
6858
(finfo->info, h->root.root.string,
6859
input_bfd, o, rel->r_offset,
6867
asection *sec = finfo->sections[r_symndx];
6869
if (sec != NULL && elf_discarded_section (sec))
6871
#if BFD_VERSION_DATE < 20031005
6872
if ((o->flags & SEC_DEBUGGING) != 0
6873
|| (sec->flags & SEC_LINK_ONCE) != 0)
6875
#if BFD_VERSION_DATE > 20021005
6876
(*finfo->info->callbacks->warning)
6878
_("warning: relocation against removed section"),
6879
NULL, input_bfd, o, rel->r_offset);
6881
BFD_ASSERT (r_symndx != 0);
6883
= ELF_R_INFO (0, ELF_R_TYPE (rel->r_info));
6891
= _("local symbols in discarded section %s");
6893
= strlen (sec->name) + strlen (msg) - 1;
6894
char *buf = (char *) bfd_malloc (amt);
6897
sprintf (buf, msg, sec->name);
6899
buf = (char *) sec->name;
6900
ok = (*finfo->info->callbacks
6901
->undefined_symbol) (finfo->info, buf,
6905
if (buf != sec->name)
6915
/* Relocate the section by invoking a back end routine.
6917
The back end routine is responsible for adjusting the
6918
section contents as necessary, and (if using Rela relocs
6919
and generating a relocateable output file) adjusting the
6920
reloc addend as necessary.
6922
The back end routine does not have to worry about setting
6923
the reloc address or the reloc symbol index.
6925
The back end routine is given a pointer to the swapped in
6926
internal symbols, and can access the hash table entries
6927
for the external symbols via elf_sym_hashes (input_bfd).
6929
When generating relocateable output, the back end routine
6930
must handle STB_LOCAL/STT_SECTION symbols specially. The
6931
output symbol is going to be a section symbol
6932
corresponding to the output section, which will require
6933
the addend to be adjusted. */
6935
if (! (*relocate_section) (output_bfd, finfo->info,
6936
input_bfd, o, contents,
6944
Elf_Internal_Rela *irela;
6945
Elf_Internal_Rela *irelaend;
6946
struct elf_link_hash_entry **rel_hash;
6947
Elf_Internal_Shdr *input_rel_hdr, *input_rel_hdr2;
6948
unsigned int next_erel;
6949
boolean (*reloc_emitter) PARAMS ((bfd *, asection *,
6950
Elf_Internal_Shdr *,
6951
Elf_Internal_Rela *));
6952
boolean rela_normal;
6954
input_rel_hdr = &elf_section_data (o)->rel_hdr;
6955
rela_normal = (bed->rela_normal
6956
&& (input_rel_hdr->sh_entsize
6957
== sizeof (Elf_External_Rela)));
6959
/* Adjust the reloc addresses and symbol indices. */
6961
irela = internal_relocs;
6962
irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
6963
rel_hash = (elf_section_data (o->output_section)->rel_hashes
6964
+ elf_section_data (o->output_section)->rel_count
6965
+ elf_section_data (o->output_section)->rel_count2);
6966
for (next_erel = 0; irela < irelaend; irela++, next_erel++)
6968
unsigned long r_symndx;
6971
if (next_erel == bed->s->int_rels_per_ext_rel)
6977
irela->r_offset += o->output_offset;
6979
/* Relocs in an executable have to be virtual addresses. */
6980
if (!finfo->info->relocateable)
6981
irela->r_offset += o->output_section->vma;
6983
r_symndx = ELF_R_SYM (irela->r_info);
6988
if (r_symndx >= locsymcount
6989
|| (elf_bad_symtab (input_bfd)
6990
&& finfo->sections[r_symndx] == NULL))
6992
struct elf_link_hash_entry *rh;
6995
/* This is a reloc against a global symbol. We
6996
have not yet output all the local symbols, so
6997
we do not know the symbol index of any global
6998
symbol. We set the rel_hash entry for this
6999
reloc to point to the global hash table entry
7000
for this symbol. The symbol index is then
7001
set at the end of elf_bfd_final_link. */
7002
indx = r_symndx - extsymoff;
7003
rh = elf_sym_hashes (input_bfd)[indx];
7004
while (rh->root.type == bfd_link_hash_indirect
7005
|| rh->root.type == bfd_link_hash_warning)
7006
rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
7008
/* Setting the index to -2 tells
7009
elf_link_output_extsym that this symbol is
7011
BFD_ASSERT (rh->indx < 0);
7019
/* This is a reloc against a local symbol. */
7022
isym = isymbuf + r_symndx;
7023
sec = finfo->sections[r_symndx];
7024
if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
7026
/* I suppose the backend ought to fill in the
7027
section of any STT_SECTION symbol against a
7028
processor specific section. If we have
7029
discarded a section, the output_section will
7030
be the absolute section. */
7031
if (bfd_is_abs_section (sec)
7033
&& bfd_is_abs_section (sec->output_section)))
7035
else if (sec == NULL || sec->owner == NULL)
7037
bfd_set_error (bfd_error_bad_value);
7042
r_symndx = sec->output_section->target_index;
7043
BFD_ASSERT (r_symndx != 0);
7046
/* Adjust the addend according to where the
7047
section winds up in the output section. */
7049
irela->r_addend += sec->output_offset;
7053
if (finfo->indices[r_symndx] == -1)
7055
unsigned long shlink;
7059
if (finfo->info->strip == strip_all)
7061
/* You can't do ld -r -s. */
7062
bfd_set_error (bfd_error_invalid_operation);
7066
/* This symbol was skipped earlier, but
7067
since it is needed by a reloc, we
7068
must output it now. */
7069
shlink = symtab_hdr->sh_link;
7070
name = (bfd_elf_string_from_elf_section
7071
(input_bfd, shlink, isym->st_name));
7075
osec = sec->output_section;
7077
_bfd_elf_section_from_bfd_section (output_bfd,
7079
if (isym->st_shndx == SHN_BAD)
7082
isym->st_value += sec->output_offset;
7083
if (! finfo->info->relocateable)
7085
isym->st_value += osec->vma;
7086
if (ELF_ST_TYPE (isym->st_info) == STT_TLS)
7088
/* STT_TLS symbols are relative to PT_TLS
7090
BFD_ASSERT (finfo->first_tls_sec != NULL);
7091
isym->st_value -= finfo->first_tls_sec->vma;
7095
finfo->indices[r_symndx]
7096
= bfd_get_symcount (output_bfd);
7098
if (! elf_link_output_sym (finfo, name, isym, sec))
7102
r_symndx = finfo->indices[r_symndx];
7105
irela->r_info = ELF_R_INFO (r_symndx,
7106
ELF_R_TYPE (irela->r_info));
7109
/* Swap out the relocs. */
7110
if (bed->elf_backend_emit_relocs
7111
&& !(finfo->info->relocateable
7112
|| finfo->info->emitrelocations))
7113
reloc_emitter = bed->elf_backend_emit_relocs;
7115
reloc_emitter = elf_link_output_relocs;
7117
if (input_rel_hdr->sh_size != 0
7118
&& ! (*reloc_emitter) (output_bfd, o, input_rel_hdr,
7122
input_rel_hdr2 = elf_section_data (o)->rel_hdr2;
7123
if (input_rel_hdr2 && input_rel_hdr2->sh_size != 0)
7125
internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
7126
* bed->s->int_rels_per_ext_rel);
7127
if (! (*reloc_emitter) (output_bfd, o, input_rel_hdr2,
7134
/* Write out the modified section contents. */
7135
if (bed->elf_backend_write_section
7136
&& (*bed->elf_backend_write_section) (output_bfd, o, contents))
7138
/* Section written out. */
7140
else switch (elf_section_data (o)->sec_info_type)
7142
case ELF_INFO_TYPE_STABS:
7143
if (! (_bfd_write_section_stabs
7145
&elf_hash_table (finfo->info)->stab_info,
7146
o, &elf_section_data (o)->sec_info, contents)))
7149
case ELF_INFO_TYPE_MERGE:
7150
if (! (_bfd_write_merged_section
7151
(output_bfd, o, elf_section_data (o)->sec_info)))
7154
case ELF_INFO_TYPE_EH_FRAME:
7159
= bfd_get_section_by_name (elf_hash_table (finfo->info)->dynobj,
7161
if (! (_bfd_elf_write_section_eh_frame (output_bfd, o, ehdrsec,
7168
bfd_size_type sec_size;
7170
sec_size = (o->_cooked_size != 0 ? o->_cooked_size : o->_raw_size);
7171
if (! (o->flags & SEC_EXCLUDE)
7172
&& ! bfd_set_section_contents (output_bfd, o->output_section,
7174
(file_ptr) o->output_offset,
7185
/* Generate a reloc when linking an ELF file. This is a reloc
7186
requested by the linker, and does come from any input file. This
7187
is used to build constructor and destructor tables when linking
7191
elf_reloc_link_order (output_bfd, info, output_section, link_order)
7193
struct bfd_link_info *info;
7194
asection *output_section;
7195
struct bfd_link_order *link_order;
7197
reloc_howto_type *howto;
7201
struct elf_link_hash_entry **rel_hash_ptr;
7202
Elf_Internal_Shdr *rel_hdr;
7203
struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
7205
howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
7208
bfd_set_error (bfd_error_bad_value);
7212
addend = link_order->u.reloc.p->addend;
7214
/* Figure out the symbol index. */
7215
rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
7216
+ elf_section_data (output_section)->rel_count
7217
+ elf_section_data (output_section)->rel_count2);
7218
if (link_order->type == bfd_section_reloc_link_order)
7220
indx = link_order->u.reloc.p->u.section->target_index;
7221
BFD_ASSERT (indx != 0);
7222
*rel_hash_ptr = NULL;
7226
struct elf_link_hash_entry *h;
7228
/* Treat a reloc against a defined symbol as though it were
7229
actually against the section. */
7230
h = ((struct elf_link_hash_entry *)
7231
bfd_wrapped_link_hash_lookup (output_bfd, info,
7232
link_order->u.reloc.p->u.name,
7233
false, false, true));
7235
&& (h->root.type == bfd_link_hash_defined
7236
|| h->root.type == bfd_link_hash_defweak))
7240
section = h->root.u.def.section;
7241
indx = section->output_section->target_index;
7242
*rel_hash_ptr = NULL;
7243
/* It seems that we ought to add the symbol value to the
7244
addend here, but in practice it has already been added
7245
because it was passed to constructor_callback. */
7246
addend += section->output_section->vma + section->output_offset;
7250
/* Setting the index to -2 tells elf_link_output_extsym that
7251
this symbol is used by a reloc. */
7258
if (! ((*info->callbacks->unattached_reloc)
7259
(info, link_order->u.reloc.p->u.name, (bfd *) NULL,
7260
(asection *) NULL, (bfd_vma) 0)))
7266
/* If this is an inplace reloc, we must write the addend into the
7268
if (howto->partial_inplace && addend != 0)
7271
bfd_reloc_status_type rstat;
7274
const char *sym_name;
7276
size = bfd_get_reloc_size (howto);
7277
buf = (bfd_byte *) bfd_zmalloc (size);
7278
if (buf == (bfd_byte *) NULL)
7280
rstat = _bfd_relocate_contents (howto, output_bfd, (bfd_vma) addend, buf);
7287
case bfd_reloc_outofrange:
7290
case bfd_reloc_overflow:
7291
if (link_order->type == bfd_section_reloc_link_order)
7292
sym_name = bfd_section_name (output_bfd,
7293
link_order->u.reloc.p->u.section);
7295
sym_name = link_order->u.reloc.p->u.name;
7296
if (! ((*info->callbacks->reloc_overflow)
7297
(info, sym_name, howto->name, addend,
7298
(bfd *) NULL, (asection *) NULL, (bfd_vma) 0)))
7305
ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
7306
(file_ptr) link_order->offset, size);
7312
/* The address of a reloc is relative to the section in a
7313
relocateable file, and is a virtual address in an executable
7315
offset = link_order->offset;
7316
if (! info->relocateable)
7317
offset += output_section->vma;
7319
rel_hdr = &elf_section_data (output_section)->rel_hdr;
7321
if (rel_hdr->sh_type == SHT_REL)
7324
Elf_Internal_Rel *irel;
7325
Elf_External_Rel *erel;
7328
size = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
7329
irel = (Elf_Internal_Rel *) bfd_zmalloc (size);
7333
for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7334
irel[i].r_offset = offset;
7335
irel[0].r_info = ELF_R_INFO (indx, howto->type);
7337
erel = ((Elf_External_Rel *) rel_hdr->contents
7338
+ elf_section_data (output_section)->rel_count);
7340
if (bed->s->swap_reloc_out)
7341
(*bed->s->swap_reloc_out) (output_bfd, irel, (bfd_byte *) erel);
7343
elf_swap_reloc_out (output_bfd, irel, erel);
7350
Elf_Internal_Rela *irela;
7351
Elf_External_Rela *erela;
7354
size = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
7355
irela = (Elf_Internal_Rela *) bfd_zmalloc (size);
7359
for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7360
irela[i].r_offset = offset;
7361
irela[0].r_info = ELF_R_INFO (indx, howto->type);
7362
irela[0].r_addend = addend;
7364
erela = ((Elf_External_Rela *) rel_hdr->contents
7365
+ elf_section_data (output_section)->rel_count);
7367
if (bed->s->swap_reloca_out)
7368
(*bed->s->swap_reloca_out) (output_bfd, irela, (bfd_byte *) erela);
7370
elf_swap_reloca_out (output_bfd, irela, erela);
7373
++elf_section_data (output_section)->rel_count;
7378
/* Allocate a pointer to live in a linker created section. */
7381
elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
7383
struct bfd_link_info *info;
7384
elf_linker_section_t *lsect;
7385
struct elf_link_hash_entry *h;
7386
const Elf_Internal_Rela *rel;
7388
elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
7389
elf_linker_section_pointers_t *linker_section_ptr;
7390
unsigned long r_symndx = ELF_R_SYM (rel->r_info);
7393
BFD_ASSERT (lsect != NULL);
7395
/* Is this a global symbol? */
7398
/* Has this symbol already been allocated? If so, our work is done. */
7399
if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
7404
ptr_linker_section_ptr = &h->linker_section_pointer;
7405
/* Make sure this symbol is output as a dynamic symbol. */
7406
if (h->dynindx == -1)
7408
if (! elf_link_record_dynamic_symbol (info, h))
7412
if (lsect->rel_section)
7413
lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
7417
/* Allocation of a pointer to a local symbol. */
7418
elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
7420
/* Allocate a table to hold the local symbols if first time. */
7423
unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
7424
register unsigned int i;
7427
amt *= sizeof (elf_linker_section_pointers_t *);
7428
ptr = (elf_linker_section_pointers_t **) bfd_alloc (abfd, amt);
7433
elf_local_ptr_offsets (abfd) = ptr;
7434
for (i = 0; i < num_symbols; i++)
7435
ptr[i] = (elf_linker_section_pointers_t *) 0;
7438
/* Has this symbol already been allocated? If so, our work is done. */
7439
if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
7444
ptr_linker_section_ptr = &ptr[r_symndx];
7448
/* If we are generating a shared object, we need to
7449
output a R_<xxx>_RELATIVE reloc so that the
7450
dynamic linker can adjust this GOT entry. */
7451
BFD_ASSERT (lsect->rel_section != NULL);
7452
lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
7456
/* Allocate space for a pointer in the linker section, and allocate
7457
a new pointer record from internal memory. */
7458
BFD_ASSERT (ptr_linker_section_ptr != NULL);
7459
amt = sizeof (elf_linker_section_pointers_t);
7460
linker_section_ptr = (elf_linker_section_pointers_t *) bfd_alloc (abfd, amt);
7462
if (!linker_section_ptr)
7465
linker_section_ptr->next = *ptr_linker_section_ptr;
7466
linker_section_ptr->addend = rel->r_addend;
7467
linker_section_ptr->which = lsect->which;
7468
linker_section_ptr->written_address_p = false;
7469
*ptr_linker_section_ptr = linker_section_ptr;
7472
if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
7474
linker_section_ptr->offset = (lsect->section->_raw_size
7475
- lsect->hole_size + (ARCH_SIZE / 8));
7476
lsect->hole_offset += ARCH_SIZE / 8;
7477
lsect->sym_offset += ARCH_SIZE / 8;
7478
if (lsect->sym_hash)
7480
/* Bump up symbol value if needed. */
7481
lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
7483
fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
7484
lsect->sym_hash->root.root.string,
7485
(long) ARCH_SIZE / 8,
7486
(long) lsect->sym_hash->root.u.def.value);
7492
linker_section_ptr->offset = lsect->section->_raw_size;
7494
lsect->section->_raw_size += ARCH_SIZE / 8;
7498
"Create pointer in linker section %s, offset = %ld, section size = %ld\n",
7499
lsect->name, (long) linker_section_ptr->offset,
7500
(long) lsect->section->_raw_size);
7507
#define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
7510
#define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
7513
/* Fill in the address for a pointer generated in a linker section. */
7516
elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h,
7517
relocation, rel, relative_reloc)
7520
struct bfd_link_info *info;
7521
elf_linker_section_t *lsect;
7522
struct elf_link_hash_entry *h;
7524
const Elf_Internal_Rela *rel;
7527
elf_linker_section_pointers_t *linker_section_ptr;
7529
BFD_ASSERT (lsect != NULL);
7533
/* Handle global symbol. */
7534
linker_section_ptr = (_bfd_elf_find_pointer_linker_section
7535
(h->linker_section_pointer,
7539
BFD_ASSERT (linker_section_ptr != NULL);
7541
if (! elf_hash_table (info)->dynamic_sections_created
7544
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
7546
/* This is actually a static link, or it is a
7547
-Bsymbolic link and the symbol is defined
7548
locally. We must initialize this entry in the
7551
When doing a dynamic link, we create a .rela.<xxx>
7552
relocation entry to initialize the value. This
7553
is done in the finish_dynamic_symbol routine. */
7554
if (!linker_section_ptr->written_address_p)
7556
linker_section_ptr->written_address_p = true;
7557
bfd_put_ptr (output_bfd,
7558
relocation + linker_section_ptr->addend,
7559
(lsect->section->contents
7560
+ linker_section_ptr->offset));
7566
/* Handle local symbol. */
7567
unsigned long r_symndx = ELF_R_SYM (rel->r_info);
7568
BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
7569
BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
7570
linker_section_ptr = (_bfd_elf_find_pointer_linker_section
7571
(elf_local_ptr_offsets (input_bfd)[r_symndx],
7575
BFD_ASSERT (linker_section_ptr != NULL);
7577
/* Write out pointer if it hasn't been rewritten out before. */
7578
if (!linker_section_ptr->written_address_p)
7580
linker_section_ptr->written_address_p = true;
7581
bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
7582
lsect->section->contents + linker_section_ptr->offset);
7586
asection *srel = lsect->rel_section;
7587
Elf_Internal_Rela *outrel;
7588
Elf_External_Rela *erel;
7589
struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
7593
amt = sizeof (Elf_Internal_Rela) * bed->s->int_rels_per_ext_rel;
7594
outrel = (Elf_Internal_Rela *) bfd_zmalloc (amt);
7597
(*_bfd_error_handler) (_("Error: out of memory"));
7601
/* We need to generate a relative reloc for the dynamic
7605
srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
7607
lsect->rel_section = srel;
7610
BFD_ASSERT (srel != NULL);
7612
for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7613
outrel[i].r_offset = (lsect->section->output_section->vma
7614
+ lsect->section->output_offset
7615
+ linker_section_ptr->offset);
7616
outrel[0].r_info = ELF_R_INFO (0, relative_reloc);
7617
outrel[0].r_addend = 0;
7618
erel = (Elf_External_Rela *) lsect->section->contents;
7619
erel += elf_section_data (lsect->section)->rel_count;
7620
elf_swap_reloca_out (output_bfd, outrel, erel);
7621
++elf_section_data (lsect->section)->rel_count;
7628
relocation = (lsect->section->output_offset
7629
+ linker_section_ptr->offset
7630
- lsect->hole_offset
7631
- lsect->sym_offset);
7635
"Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
7636
lsect->name, (long) relocation, (long) relocation);
7639
/* Subtract out the addend, because it will get added back in by the normal
7641
return relocation - linker_section_ptr->addend;
7644
/* Garbage collect unused sections. */
7646
static boolean elf_gc_mark
7647
PARAMS ((struct bfd_link_info *, asection *,
7648
asection * (*) (asection *, struct bfd_link_info *,
7649
Elf_Internal_Rela *, struct elf_link_hash_entry *,
7650
Elf_Internal_Sym *)));
7652
static boolean elf_gc_sweep
7653
PARAMS ((struct bfd_link_info *,
7654
boolean (*) (bfd *, struct bfd_link_info *, asection *,
7655
const Elf_Internal_Rela *)));
7657
static boolean elf_gc_sweep_symbol
7658
PARAMS ((struct elf_link_hash_entry *, PTR));
7660
static boolean elf_gc_allocate_got_offsets
7661
PARAMS ((struct elf_link_hash_entry *, PTR));
7663
static boolean elf_gc_propagate_vtable_entries_used
7664
PARAMS ((struct elf_link_hash_entry *, PTR));
7666
static boolean elf_gc_smash_unused_vtentry_relocs
7667
PARAMS ((struct elf_link_hash_entry *, PTR));
7669
/* The mark phase of garbage collection. For a given section, mark
7670
it and any sections in this section's group, and all the sections
7671
which define symbols to which it refers. */
7674
elf_gc_mark (info, sec, gc_mark_hook)
7675
struct bfd_link_info *info;
7677
asection * (*gc_mark_hook) PARAMS ((asection *, struct bfd_link_info *,
7678
Elf_Internal_Rela *,
7679
struct elf_link_hash_entry *,
7680
Elf_Internal_Sym *));
7683
asection *group_sec;
7687
/* Mark all the sections in the group. */
7688
group_sec = elf_section_data (sec)->next_in_group;
7689
if (group_sec && !group_sec->gc_mark)
7690
if (!elf_gc_mark (info, group_sec, gc_mark_hook))
7693
/* Look through the section relocs. */
7695
if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
7697
Elf_Internal_Rela *relstart, *rel, *relend;
7698
Elf_Internal_Shdr *symtab_hdr;
7699
struct elf_link_hash_entry **sym_hashes;
7702
bfd *input_bfd = sec->owner;
7703
struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
7704
Elf_Internal_Sym *isym = NULL;
7706
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
7707
sym_hashes = elf_sym_hashes (input_bfd);
7709
/* Read the local symbols. */
7710
if (elf_bad_symtab (input_bfd))
7712
nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
7716
extsymoff = nlocsyms = symtab_hdr->sh_info;
7718
isym = (Elf_Internal_Sym *) symtab_hdr->contents;
7719
if (isym == NULL && nlocsyms != 0)
7721
isym = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, nlocsyms, 0,
7727
/* Read the relocations. */
7728
relstart = (NAME(_bfd_elf,link_read_relocs)
7729
(input_bfd, sec, NULL, (Elf_Internal_Rela *) NULL,
7730
info->keep_memory));
7731
if (relstart == NULL)
7736
relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
7738
for (rel = relstart; rel < relend; rel++)
7740
unsigned long r_symndx;
7742
struct elf_link_hash_entry *h;
7744
r_symndx = ELF_R_SYM (rel->r_info);
7748
if (r_symndx >= nlocsyms
7749
|| ELF_ST_BIND (isym[r_symndx].st_info) != STB_LOCAL)
7751
h = sym_hashes[r_symndx - extsymoff];
7752
rsec = (*gc_mark_hook) (sec, info, rel, h, NULL);
7756
rsec = (*gc_mark_hook) (sec, info, rel, NULL, &isym[r_symndx]);
7759
if (rsec && !rsec->gc_mark)
7761
if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
7763
else if (!elf_gc_mark (info, rsec, gc_mark_hook))
7772
if (elf_section_data (sec)->relocs != relstart)
7775
if (isym != NULL && symtab_hdr->contents != (unsigned char *) isym)
7777
if (! info->keep_memory)
7780
symtab_hdr->contents = (unsigned char *) isym;
7787
/* The sweep phase of garbage collection. Remove all garbage sections. */
7790
elf_gc_sweep (info, gc_sweep_hook)
7791
struct bfd_link_info *info;
7792
boolean (*gc_sweep_hook) PARAMS ((bfd *, struct bfd_link_info *,
7793
asection *, const Elf_Internal_Rela *));
7797
for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
7801
if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
7804
for (o = sub->sections; o != NULL; o = o->next)
7806
/* Keep special sections. Keep .debug sections. */
7807
if ((o->flags & SEC_LINKER_CREATED)
7808
|| (o->flags & SEC_DEBUGGING))
7814
/* Skip sweeping sections already excluded. */
7815
if (o->flags & SEC_EXCLUDE)
7818
/* Since this is early in the link process, it is simple
7819
to remove a section from the output. */
7820
o->flags |= SEC_EXCLUDE;
7822
/* But we also have to update some of the relocation
7823
info we collected before. */
7825
&& (o->flags & SEC_RELOC) && o->reloc_count > 0)
7827
Elf_Internal_Rela *internal_relocs;
7830
internal_relocs = (NAME(_bfd_elf,link_read_relocs)
7831
(o->owner, o, NULL, NULL, info->keep_memory));
7832
if (internal_relocs == NULL)
7835
r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
7837
if (elf_section_data (o)->relocs != internal_relocs)
7838
free (internal_relocs);
7846
/* Remove the symbols that were in the swept sections from the dynamic
7847
symbol table. GCFIXME: Anyone know how to get them out of the
7848
static symbol table as well? */
7852
elf_link_hash_traverse (elf_hash_table (info),
7853
elf_gc_sweep_symbol,
7856
elf_hash_table (info)->dynsymcount = i;
7862
/* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
7865
elf_gc_sweep_symbol (h, idxptr)
7866
struct elf_link_hash_entry *h;
7869
int *idx = (int *) idxptr;
7871
if (h->root.type == bfd_link_hash_warning)
7872
h = (struct elf_link_hash_entry *) h->root.u.i.link;
7874
if (h->dynindx != -1
7875
&& ((h->root.type != bfd_link_hash_defined
7876
&& h->root.type != bfd_link_hash_defweak)
7877
|| h->root.u.def.section->gc_mark))
7878
h->dynindx = (*idx)++;
7883
/* Propogate collected vtable information. This is called through
7884
elf_link_hash_traverse. */
7887
elf_gc_propagate_vtable_entries_used (h, okp)
7888
struct elf_link_hash_entry *h;
7891
if (h->root.type == bfd_link_hash_warning)
7892
h = (struct elf_link_hash_entry *) h->root.u.i.link;
7894
/* Those that are not vtables. */
7895
if (h->vtable_parent == NULL)
7898
/* Those vtables that do not have parents, we cannot merge. */
7899
if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
7902
/* If we've already been done, exit. */
7903
if (h->vtable_entries_used && h->vtable_entries_used[-1])
7906
/* Make sure the parent's table is up to date. */
7907
elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
7909
if (h->vtable_entries_used == NULL)
7911
/* None of this table's entries were referenced. Re-use the
7913
h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
7914
h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
7921
/* Or the parent's entries into ours. */
7922
cu = h->vtable_entries_used;
7924
pu = h->vtable_parent->vtable_entries_used;
7927
asection *sec = h->root.u.def.section;
7928
struct elf_backend_data *bed = get_elf_backend_data (sec->owner);
7929
int file_align = bed->s->file_align;
7931
n = h->vtable_parent->vtable_entries_size / file_align;
7946
elf_gc_smash_unused_vtentry_relocs (h, okp)
7947
struct elf_link_hash_entry *h;
7951
bfd_vma hstart, hend;
7952
Elf_Internal_Rela *relstart, *relend, *rel;
7953
struct elf_backend_data *bed;
7956
if (h->root.type == bfd_link_hash_warning)
7957
h = (struct elf_link_hash_entry *) h->root.u.i.link;
7959
/* Take care of both those symbols that do not describe vtables as
7960
well as those that are not loaded. */
7961
if (h->vtable_parent == NULL)
7964
BFD_ASSERT (h->root.type == bfd_link_hash_defined
7965
|| h->root.type == bfd_link_hash_defweak);
7967
sec = h->root.u.def.section;
7968
hstart = h->root.u.def.value;
7969
hend = hstart + h->size;
7971
relstart = (NAME(_bfd_elf,link_read_relocs)
7972
(sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true));
7974
return *(boolean *) okp = false;
7975
bed = get_elf_backend_data (sec->owner);
7976
file_align = bed->s->file_align;
7978
relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
7980
for (rel = relstart; rel < relend; ++rel)
7981
if (rel->r_offset >= hstart && rel->r_offset < hend)
7983
/* If the entry is in use, do nothing. */
7984
if (h->vtable_entries_used
7985
&& (rel->r_offset - hstart) < h->vtable_entries_size)
7987
bfd_vma entry = (rel->r_offset - hstart) / file_align;
7988
if (h->vtable_entries_used[entry])
7991
/* Otherwise, kill it. */
7992
rel->r_offset = rel->r_info = rel->r_addend = 0;
7998
/* Do mark and sweep of unused sections. */
8001
elf_gc_sections (abfd, info)
8003
struct bfd_link_info *info;
8007
asection * (*gc_mark_hook)
8008
PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
8009
struct elf_link_hash_entry *h, Elf_Internal_Sym *));
8011
if (!get_elf_backend_data (abfd)->can_gc_sections
8012
|| info->relocateable || info->emitrelocations
8013
|| elf_hash_table (info)->dynamic_sections_created)
8016
/* Apply transitive closure to the vtable entry usage info. */
8017
elf_link_hash_traverse (elf_hash_table (info),
8018
elf_gc_propagate_vtable_entries_used,
8023
/* Kill the vtable relocations that were not used. */
8024
elf_link_hash_traverse (elf_hash_table (info),
8025
elf_gc_smash_unused_vtentry_relocs,
8030
/* Grovel through relocs to find out who stays ... */
8032
gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
8033
for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
8037
if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
8040
for (o = sub->sections; o != NULL; o = o->next)
8042
if (o->flags & SEC_KEEP)
8043
if (!elf_gc_mark (info, o, gc_mark_hook))
8048
/* ... and mark SEC_EXCLUDE for those that go. */
8049
if (!elf_gc_sweep (info, get_elf_backend_data (abfd)->gc_sweep_hook))
8055
/* Called from check_relocs to record the existance of a VTINHERIT reloc. */
8058
elf_gc_record_vtinherit (abfd, sec, h, offset)
8061
struct elf_link_hash_entry *h;
8064
struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
8065
struct elf_link_hash_entry **search, *child;
8066
bfd_size_type extsymcount;
8068
/* The sh_info field of the symtab header tells us where the
8069
external symbols start. We don't care about the local symbols at
8071
extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
8072
if (!elf_bad_symtab (abfd))
8073
extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
8075
sym_hashes = elf_sym_hashes (abfd);
8076
sym_hashes_end = sym_hashes + extsymcount;
8078
/* Hunt down the child symbol, which is in this section at the same
8079
offset as the relocation. */
8080
for (search = sym_hashes; search != sym_hashes_end; ++search)
8082
if ((child = *search) != NULL
8083
&& (child->root.type == bfd_link_hash_defined
8084
|| child->root.type == bfd_link_hash_defweak)
8085
&& child->root.u.def.section == sec
8086
&& child->root.u.def.value == offset)
8090
(*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
8091
bfd_archive_filename (abfd), sec->name,
8092
(unsigned long) offset);
8093
bfd_set_error (bfd_error_invalid_operation);
8099
/* This *should* only be the absolute section. It could potentially
8100
be that someone has defined a non-global vtable though, which
8101
would be bad. It isn't worth paging in the local symbols to be
8102
sure though; that case should simply be handled by the assembler. */
8104
child->vtable_parent = (struct elf_link_hash_entry *) -1;
8107
child->vtable_parent = h;
8112
/* Called from check_relocs to record the existance of a VTENTRY reloc. */
8115
elf_gc_record_vtentry (abfd, sec, h, addend)
8116
bfd *abfd ATTRIBUTE_UNUSED;
8117
asection *sec ATTRIBUTE_UNUSED;
8118
struct elf_link_hash_entry *h;
8121
struct elf_backend_data *bed = get_elf_backend_data (abfd);
8122
int file_align = bed->s->file_align;
8124
if (addend >= h->vtable_entries_size)
8127
boolean *ptr = h->vtable_entries_used;
8129
/* While the symbol is undefined, we have to be prepared to handle
8131
if (h->root.type == bfd_link_hash_undefined)
8138
/* Oops! We've got a reference past the defined end of
8139
the table. This is probably a bug -- shall we warn? */
8144
/* Allocate one extra entry for use as a "done" flag for the
8145
consolidation pass. */
8146
bytes = (size / file_align + 1) * sizeof (boolean);
8150
ptr = bfd_realloc (ptr - 1, (bfd_size_type) bytes);
8156
oldbytes = ((h->vtable_entries_size / file_align + 1)
8157
* sizeof (boolean));
8158
memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
8162
ptr = bfd_zmalloc ((bfd_size_type) bytes);
8167
/* And arrange for that done flag to be at index -1. */
8168
h->vtable_entries_used = ptr + 1;
8169
h->vtable_entries_size = size;
8172
h->vtable_entries_used[addend / file_align] = true;
8177
/* And an accompanying bit to work out final got entry offsets once
8178
we're done. Should be called from final_link. */
8181
elf_gc_common_finalize_got_offsets (abfd, info)
8183
struct bfd_link_info *info;
8186
struct elf_backend_data *bed = get_elf_backend_data (abfd);
8189
/* The GOT offset is relative to the .got section, but the GOT header is
8190
put into the .got.plt section, if the backend uses it. */
8191
if (bed->want_got_plt)
8194
gotoff = bed->got_header_size;
8196
/* Do the local .got entries first. */
8197
for (i = info->input_bfds; i; i = i->link_next)
8199
bfd_signed_vma *local_got;
8200
bfd_size_type j, locsymcount;
8201
Elf_Internal_Shdr *symtab_hdr;
8203
if (bfd_get_flavour (i) != bfd_target_elf_flavour)
8206
local_got = elf_local_got_refcounts (i);
8210
symtab_hdr = &elf_tdata (i)->symtab_hdr;
8211
if (elf_bad_symtab (i))
8212
locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
8214
locsymcount = symtab_hdr->sh_info;
8216
for (j = 0; j < locsymcount; ++j)
8218
if (local_got[j] > 0)
8220
local_got[j] = gotoff;
8221
gotoff += ARCH_SIZE / 8;
8224
local_got[j] = (bfd_vma) -1;
8228
/* Then the global .got entries. .plt refcounts are handled by
8229
adjust_dynamic_symbol */
8230
elf_link_hash_traverse (elf_hash_table (info),
8231
elf_gc_allocate_got_offsets,
8236
/* We need a special top-level link routine to convert got reference counts
8237
to real got offsets. */
8240
elf_gc_allocate_got_offsets (h, offarg)
8241
struct elf_link_hash_entry *h;
8244
bfd_vma *off = (bfd_vma *) offarg;
8246
if (h->root.type == bfd_link_hash_warning)
8247
h = (struct elf_link_hash_entry *) h->root.u.i.link;
8249
if (h->got.refcount > 0)
8251
h->got.offset = off[0];
8252
off[0] += ARCH_SIZE / 8;
8255
h->got.offset = (bfd_vma) -1;
8260
/* Many folk need no more in the way of final link than this, once
8261
got entry reference counting is enabled. */
8264
elf_gc_common_final_link (abfd, info)
8266
struct bfd_link_info *info;
8268
if (!elf_gc_common_finalize_got_offsets (abfd, info))
8271
/* Invoke the regular ELF backend linker to do all the work. */
8272
return elf_bfd_final_link (abfd, info);
8275
/* This function will be called though elf_link_hash_traverse to store
8276
all hash value of the exported symbols in an array. */
8279
elf_collect_hash_codes (h, data)
8280
struct elf_link_hash_entry *h;
8283
unsigned long **valuep = (unsigned long **) data;
8289
if (h->root.type == bfd_link_hash_warning)
8290
h = (struct elf_link_hash_entry *) h->root.u.i.link;
8292
/* Ignore indirect symbols. These are added by the versioning code. */
8293
if (h->dynindx == -1)
8296
name = h->root.root.string;
8297
p = strchr (name, ELF_VER_CHR);
8300
alc = bfd_malloc ((bfd_size_type) (p - name + 1));
8301
memcpy (alc, name, (size_t) (p - name));
8302
alc[p - name] = '\0';
8306
/* Compute the hash value. */
8307
ha = bfd_elf_hash (name);
8309
/* Store the found hash value in the array given as the argument. */
8312
/* And store it in the struct so that we can put it in the hash table
8314
h->elf_hash_value = ha;
8323
elf_reloc_symbol_deleted_p (offset, cookie)
8327
struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
8329
if (rcookie->bad_symtab)
8330
rcookie->rel = rcookie->rels;
8332
for (; rcookie->rel < rcookie->relend; rcookie->rel++)
8334
unsigned long r_symndx = ELF_R_SYM (rcookie->rel->r_info);
8336
if (! rcookie->bad_symtab)
8337
if (rcookie->rel->r_offset > offset)
8339
if (rcookie->rel->r_offset != offset)
8342
if (r_symndx >= rcookie->locsymcount
8343
|| ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
8345
struct elf_link_hash_entry *h;
8347
h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
8349
while (h->root.type == bfd_link_hash_indirect
8350
|| h->root.type == bfd_link_hash_warning)
8351
h = (struct elf_link_hash_entry *) h->root.u.i.link;
8353
if ((h->root.type == bfd_link_hash_defined
8354
|| h->root.type == bfd_link_hash_defweak)
8355
&& elf_discarded_section (h->root.u.def.section))
8362
/* It's not a relocation against a global symbol,
8363
but it could be a relocation against a local
8364
symbol for a discarded section. */
8366
Elf_Internal_Sym *isym;
8368
/* Need to: get the symbol; get the section. */
8369
isym = &rcookie->locsyms[r_symndx];
8370
if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
8372
isec = section_from_elf_index (rcookie->abfd, isym->st_shndx);
8373
if (isec != NULL && elf_discarded_section (isec))
8382
/* Discard unneeded references to discarded sections.
8383
Returns true if any section's size was changed. */
8384
/* This function assumes that the relocations are in sorted order,
8385
which is true for all known assemblers. */
8388
elf_bfd_discard_info (output_bfd, info)
8390
struct bfd_link_info *info;
8392
struct elf_reloc_cookie cookie;
8393
asection *stab, *eh, *ehdr;
8394
Elf_Internal_Shdr *symtab_hdr;
8395
struct elf_backend_data *bed;
8397
boolean ret = false;
8398
boolean strip = info->strip == strip_all || info->strip == strip_debugger;
8400
if (info->relocateable
8401
|| info->traditional_format
8402
|| info->hash->creator->flavour != bfd_target_elf_flavour
8403
|| ! is_elf_hash_table (info))
8407
if (elf_hash_table (info)->dynobj != NULL)
8408
ehdr = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
8411
for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
8413
if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
8416
bed = get_elf_backend_data (abfd);
8418
if ((abfd->flags & DYNAMIC) != 0)
8424
eh = bfd_get_section_by_name (abfd, ".eh_frame");
8425
if (eh && (eh->_raw_size == 0
8426
|| bfd_is_abs_section (eh->output_section)))
8433
stab = bfd_get_section_by_name (abfd, ".stab");
8434
if (stab && (stab->_raw_size == 0
8435
|| bfd_is_abs_section (stab->output_section)))
8439
|| elf_section_data(stab)->sec_info_type != ELF_INFO_TYPE_STABS)
8441
&& (strip || ! bed->elf_backend_discard_info))
8444
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8446
cookie.sym_hashes = elf_sym_hashes (abfd);
8447
cookie.bad_symtab = elf_bad_symtab (abfd);
8448
if (cookie.bad_symtab)
8450
cookie.locsymcount =
8451
symtab_hdr->sh_size / sizeof (Elf_External_Sym);
8452
cookie.extsymoff = 0;
8456
cookie.locsymcount = symtab_hdr->sh_info;
8457
cookie.extsymoff = symtab_hdr->sh_info;
8460
cookie.locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
8461
if (cookie.locsyms == NULL && cookie.locsymcount != 0)
8463
cookie.locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
8464
cookie.locsymcount, 0,
8466
if (cookie.locsyms == NULL)
8472
cookie.rels = (NAME(_bfd_elf,link_read_relocs)
8473
(abfd, stab, (PTR) NULL, (Elf_Internal_Rela *) NULL,
8474
info->keep_memory));
8477
cookie.rel = cookie.rels;
8479
cookie.rels + stab->reloc_count * bed->s->int_rels_per_ext_rel;
8480
if (_bfd_discard_section_stabs (abfd, stab,
8481
elf_section_data (stab)->sec_info,
8482
elf_reloc_symbol_deleted_p,
8485
if (elf_section_data (stab)->relocs != cookie.rels)
8494
cookie.relend = NULL;
8495
if (eh->reloc_count)
8496
cookie.rels = (NAME(_bfd_elf,link_read_relocs)
8497
(abfd, eh, (PTR) NULL, (Elf_Internal_Rela *) NULL,
8498
info->keep_memory));
8501
cookie.rel = cookie.rels;
8503
cookie.rels + eh->reloc_count * bed->s->int_rels_per_ext_rel;
8505
if (_bfd_elf_discard_section_eh_frame (abfd, info, eh, ehdr,
8506
elf_reloc_symbol_deleted_p,
8509
if (cookie.rels && elf_section_data (eh)->relocs != cookie.rels)
8513
if (bed->elf_backend_discard_info)
8515
if (bed->elf_backend_discard_info (abfd, &cookie, info))
8519
if (cookie.locsyms != NULL
8520
&& symtab_hdr->contents != (unsigned char *) cookie.locsyms)
8522
if (! info->keep_memory)
8523
free (cookie.locsyms);
8525
symtab_hdr->contents = (unsigned char *) cookie.locsyms;
8529
if (ehdr && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info, ehdr))
8535
elf_section_ignore_discarded_relocs (sec)
8538
struct elf_backend_data *bed;
8540
switch (elf_section_data (sec)->sec_info_type)
8542
case ELF_INFO_TYPE_STABS:
8543
case ELF_INFO_TYPE_EH_FRAME:
8549
bed = get_elf_backend_data (sec->owner);
8550
if (bed->elf_backend_ignore_discarded_relocs != NULL
8551
&& (*bed->elf_backend_ignore_discarded_relocs) (sec))
added
removed
binutils/bfd/elflink.h
