mirror of
https://sourceware.org/git/binutils-gdb.git
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6332 lines
182 KiB
C++
6332 lines
182 KiB
C++
/* ELF linker support.
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Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
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Free Software Foundation, Inc.
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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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static bfd_boolean elf_link_add_object_symbols (bfd *, struct bfd_link_info *);
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static bfd_boolean elf_link_add_archive_symbols (bfd *,
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struct bfd_link_info *);
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static bfd_boolean elf_finalize_dynstr (bfd *, struct bfd_link_info *);
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static bfd_boolean elf_collect_hash_codes (struct elf_link_hash_entry *,
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void *);
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static bfd_boolean elf_section_ignore_discarded_relocs (asection *);
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/* Given an ELF BFD, add symbols to the global hash table as
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appropriate. */
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bfd_boolean
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elf_bfd_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
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{
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switch (bfd_get_format (abfd))
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{
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case bfd_object:
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return elf_link_add_object_symbols (abfd, info);
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case bfd_archive:
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return elf_link_add_archive_symbols (abfd, info);
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default:
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bfd_set_error (bfd_error_wrong_format);
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return FALSE;
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}
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}
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/* Return TRUE iff this is a non-common, definition of a non-function symbol. */
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static bfd_boolean
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is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
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Elf_Internal_Sym *sym)
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{
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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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return FALSE;
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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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return FALSE;
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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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return FALSE;
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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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return FALSE;
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/* If the symbol is in a target specific section then we
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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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return FALSE;
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return TRUE;
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}
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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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static bfd_boolean
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elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
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{
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Elf_Internal_Shdr * hdr;
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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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bfd_boolean result;
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abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
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if (abfd == NULL)
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return FALSE;
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if (! bfd_check_format (abfd, bfd_object))
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return FALSE;
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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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return FALSE;
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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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else
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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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{
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extsymcount = symcount;
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extsymoff = 0;
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}
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else
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{
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extsymcount = symcount - hdr->sh_info;
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extsymoff = hdr->sh_info;
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}
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if (extsymcount == 0)
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return FALSE;
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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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NULL, NULL, NULL);
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if (isymbuf == NULL)
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return FALSE;
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/* Scan the symbol table looking for SYMDEF. */
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result = FALSE;
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for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
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{
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const char *name;
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name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
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isym->st_name);
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if (name == NULL)
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break;
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if (strcmp (name, symdef->name) == 0)
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{
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result = is_global_data_symbol_definition (abfd, isym);
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break;
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}
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}
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free (isymbuf);
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return result;
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}
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/* Add symbols from an ELF archive file to the linker hash table. We
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don't use _bfd_generic_link_add_archive_symbols because of a
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problem which arises on UnixWare. The UnixWare libc.so is an
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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
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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
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bunch of symbols. This means that some of the other objects in the
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archive are not included in the link, which is incorrect since they
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precede libc.so.1 in the archive.
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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
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oddities. In ELF, if we find a symbol in the archive map, and the
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symbol is currently undefined, we know that we must pull in that
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object file.
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Unfortunately, we do have to make multiple passes over the symbol
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table until nothing further is resolved. */
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static bfd_boolean
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elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
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{
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symindex c;
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bfd_boolean *defined = NULL;
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bfd_boolean *included = NULL;
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carsym *symdefs;
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bfd_boolean loop;
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bfd_size_type amt;
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if (! bfd_has_map (abfd))
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{
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/* An empty archive is a special case. */
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if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
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return TRUE;
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bfd_set_error (bfd_error_no_armap);
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return FALSE;
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}
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/* Keep track of all symbols we know to be already defined, and all
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files we know to be already included. This is to speed up the
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second and subsequent passes. */
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c = bfd_ardata (abfd)->symdef_count;
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if (c == 0)
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return TRUE;
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amt = c;
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amt *= sizeof (bfd_boolean);
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defined = bfd_zmalloc (amt);
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included = bfd_zmalloc (amt);
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if (defined == NULL || included == NULL)
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goto error_return;
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symdefs = bfd_ardata (abfd)->symdefs;
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do
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{
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file_ptr last;
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symindex i;
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carsym *symdef;
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carsym *symdefend;
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loop = FALSE;
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last = -1;
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symdef = symdefs;
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symdefend = symdef + c;
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for (i = 0; symdef < symdefend; symdef++, i++)
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{
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struct elf_link_hash_entry *h;
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bfd *element;
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struct bfd_link_hash_entry *undefs_tail;
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symindex mark;
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if (defined[i] || included[i])
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continue;
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if (symdef->file_offset == last)
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{
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included[i] = TRUE;
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continue;
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}
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h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
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FALSE, FALSE, FALSE);
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if (h == NULL)
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{
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char *p, *copy;
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size_t len, first;
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/* If this is a default version (the name contains @@),
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look up the symbol again with only one `@' as well
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as without the version. The effect is that references
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to the symbol with and without the version will be
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matched by the default symbol in the archive. */
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p = strchr (symdef->name, ELF_VER_CHR);
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if (p == NULL || p[1] != ELF_VER_CHR)
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continue;
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/* First check with only one `@'. */
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len = strlen (symdef->name);
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copy = bfd_alloc (abfd, len);
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if (copy == NULL)
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goto error_return;
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first = p - symdef->name + 1;
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memcpy (copy, symdef->name, first);
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memcpy (copy + first, symdef->name + first + 1, len - first);
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h = elf_link_hash_lookup (elf_hash_table (info), copy,
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FALSE, FALSE, FALSE);
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if (h == NULL)
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{
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/* We also need to check references to the symbol
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without the version. */
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copy[first - 1] = '\0';
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h = elf_link_hash_lookup (elf_hash_table (info),
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copy, FALSE, FALSE, FALSE);
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}
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bfd_release (abfd, copy);
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}
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if (h == NULL)
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continue;
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if (h->root.type == bfd_link_hash_common)
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{
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/* We currently have a common symbol. The archive map contains
|
||
a reference to this symbol, so we may want to include it. We
|
||
only want to include it however, if this archive element
|
||
contains a definition of the symbol, not just another common
|
||
declaration of it.
|
||
|
||
Unfortunately some archivers (including GNU ar) will put
|
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declarations of common symbols into their archive maps, as
|
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well as real definitions, so we cannot just go by the archive
|
||
map alone. Instead we must read in the element's symbol
|
||
table and check that to see what kind of symbol definition
|
||
this is. */
|
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if (! elf_link_is_defined_archive_symbol (abfd, symdef))
|
||
continue;
|
||
}
|
||
else if (h->root.type != bfd_link_hash_undefined)
|
||
{
|
||
if (h->root.type != bfd_link_hash_undefweak)
|
||
defined[i] = TRUE;
|
||
continue;
|
||
}
|
||
|
||
/* We need to include this archive member. */
|
||
element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
|
||
if (element == NULL)
|
||
goto error_return;
|
||
|
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if (! bfd_check_format (element, bfd_object))
|
||
goto error_return;
|
||
|
||
/* Doublecheck that we have not included this object
|
||
already--it should be impossible, but there may be
|
||
something wrong with the archive. */
|
||
if (element->archive_pass != 0)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_return;
|
||
}
|
||
element->archive_pass = 1;
|
||
|
||
undefs_tail = info->hash->undefs_tail;
|
||
|
||
if (! (*info->callbacks->add_archive_element) (info, element,
|
||
symdef->name))
|
||
goto error_return;
|
||
if (! elf_link_add_object_symbols (element, info))
|
||
goto error_return;
|
||
|
||
/* If there are any new undefined symbols, we need to make
|
||
another pass through the archive in order to see whether
|
||
they can be defined. FIXME: This isn't perfect, because
|
||
common symbols wind up on undefs_tail and because an
|
||
undefined symbol which is defined later on in this pass
|
||
does not require another pass. This isn't a bug, but it
|
||
does make the code less efficient than it could be. */
|
||
if (undefs_tail != info->hash->undefs_tail)
|
||
loop = TRUE;
|
||
|
||
/* Look backward to mark all symbols from this object file
|
||
which we have already seen in this pass. */
|
||
mark = i;
|
||
do
|
||
{
|
||
included[mark] = TRUE;
|
||
if (mark == 0)
|
||
break;
|
||
--mark;
|
||
}
|
||
while (symdefs[mark].file_offset == symdef->file_offset);
|
||
|
||
/* We mark subsequent symbols from this object file as we go
|
||
on through the loop. */
|
||
last = symdef->file_offset;
|
||
}
|
||
}
|
||
while (loop);
|
||
|
||
free (defined);
|
||
free (included);
|
||
|
||
return TRUE;
|
||
|
||
error_return:
|
||
if (defined != NULL)
|
||
free (defined);
|
||
if (included != NULL)
|
||
free (included);
|
||
return FALSE;
|
||
}
|
||
|
||
/* Add symbols from an ELF object file to the linker hash table. */
|
||
|
||
static bfd_boolean
|
||
elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
bfd_boolean (*add_symbol_hook)
|
||
(bfd *, struct bfd_link_info *, const Elf_Internal_Sym *,
|
||
const char **, flagword *, asection **, bfd_vma *);
|
||
bfd_boolean (*check_relocs)
|
||
(bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
|
||
bfd_boolean collect;
|
||
Elf_Internal_Shdr *hdr;
|
||
bfd_size_type symcount;
|
||
bfd_size_type extsymcount;
|
||
bfd_size_type extsymoff;
|
||
struct elf_link_hash_entry **sym_hash;
|
||
bfd_boolean dynamic;
|
||
Elf_External_Versym *extversym = NULL;
|
||
Elf_External_Versym *ever;
|
||
struct elf_link_hash_entry *weaks;
|
||
struct elf_link_hash_entry **nondeflt_vers = NULL;
|
||
bfd_size_type nondeflt_vers_cnt = 0;
|
||
Elf_Internal_Sym *isymbuf = NULL;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymend;
|
||
const struct elf_backend_data *bed;
|
||
bfd_boolean dt_needed;
|
||
struct elf_link_hash_table * hash_table;
|
||
bfd_size_type amt;
|
||
|
||
hash_table = elf_hash_table (info);
|
||
|
||
bed = get_elf_backend_data (abfd);
|
||
add_symbol_hook = bed->elf_add_symbol_hook;
|
||
collect = bed->collect;
|
||
|
||
if ((abfd->flags & DYNAMIC) == 0)
|
||
dynamic = FALSE;
|
||
else
|
||
{
|
||
dynamic = TRUE;
|
||
|
||
/* You can't use -r against a dynamic object. Also, there's no
|
||
hope of using a dynamic object which does not exactly match
|
||
the format of the output file. */
|
||
if (info->relocatable || info->hash->creator != abfd->xvec)
|
||
{
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
/* As a GNU extension, any input sections which are named
|
||
.gnu.warning.SYMBOL are treated as warning symbols for the given
|
||
symbol. This differs from .gnu.warning sections, which generate
|
||
warnings when they are included in an output file. */
|
||
if (info->executable)
|
||
{
|
||
asection *s;
|
||
|
||
for (s = abfd->sections; s != NULL; s = s->next)
|
||
{
|
||
const char *name;
|
||
|
||
name = bfd_get_section_name (abfd, s);
|
||
if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
|
||
{
|
||
char *msg;
|
||
bfd_size_type sz;
|
||
bfd_size_type prefix_len;
|
||
const char * gnu_warning_prefix = _("warning: ");
|
||
|
||
name += sizeof ".gnu.warning." - 1;
|
||
|
||
/* If this is a shared object, then look up the symbol
|
||
in the hash table. If it is there, and it is already
|
||
been defined, then we will not be using the entry
|
||
from this shared object, so we don't need to warn.
|
||
FIXME: If we see the definition in a regular object
|
||
later on, we will warn, but we shouldn't. The only
|
||
fix is to keep track of what warnings we are supposed
|
||
to emit, and then handle them all at the end of the
|
||
link. */
|
||
if (dynamic && abfd->xvec == info->hash->creator)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = elf_link_hash_lookup (hash_table, name,
|
||
FALSE, FALSE, TRUE);
|
||
|
||
/* FIXME: What about bfd_link_hash_common? */
|
||
if (h != NULL
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak))
|
||
{
|
||
/* We don't want to issue this warning. Clobber
|
||
the section size so that the warning does not
|
||
get copied into the output file. */
|
||
s->_raw_size = 0;
|
||
continue;
|
||
}
|
||
}
|
||
|
||
sz = bfd_section_size (abfd, s);
|
||
prefix_len = strlen (gnu_warning_prefix);
|
||
msg = bfd_alloc (abfd, prefix_len + sz + 1);
|
||
if (msg == NULL)
|
||
goto error_return;
|
||
|
||
strcpy (msg, gnu_warning_prefix);
|
||
if (! bfd_get_section_contents (abfd, s, msg + prefix_len, 0, sz))
|
||
goto error_return;
|
||
|
||
msg[prefix_len + sz] = '\0';
|
||
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, abfd, name, BSF_WARNING, s, 0, msg,
|
||
FALSE, collect, NULL)))
|
||
goto error_return;
|
||
|
||
if (! info->relocatable)
|
||
{
|
||
/* Clobber the section size so that the warning does
|
||
not get copied into the output file. */
|
||
s->_raw_size = 0;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
dt_needed = FALSE;
|
||
if (! dynamic)
|
||
{
|
||
/* If we are creating a shared library, create all the dynamic
|
||
sections immediately. We need to attach them to something,
|
||
so we attach them to this BFD, provided it is the right
|
||
format. FIXME: If there are no input BFD's of the same
|
||
format as the output, we can't make a shared library. */
|
||
if (info->shared
|
||
&& is_elf_hash_table (info)
|
||
&& ! hash_table->dynamic_sections_created
|
||
&& abfd->xvec == info->hash->creator)
|
||
{
|
||
if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
|
||
goto error_return;
|
||
}
|
||
}
|
||
else if (! is_elf_hash_table (info))
|
||
goto error_return;
|
||
else
|
||
{
|
||
asection *s;
|
||
bfd_boolean add_needed;
|
||
const char *name;
|
||
bfd_size_type oldsize;
|
||
bfd_size_type strindex;
|
||
struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
|
||
|
||
/* ld --just-symbols and dynamic objects don't mix very well.
|
||
Test for --just-symbols by looking at info set up by
|
||
_bfd_elf_link_just_syms. */
|
||
if ((s = abfd->sections) != NULL
|
||
&& s->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
|
||
goto error_return;
|
||
|
||
/* Find the name to use in a DT_NEEDED entry that refers to this
|
||
object. If the object has a DT_SONAME entry, we use it.
|
||
Otherwise, if the generic linker stuck something in
|
||
elf_dt_name, we use that. Otherwise, we just use the file
|
||
name. If the generic linker put a null string into
|
||
elf_dt_name, we don't make a DT_NEEDED entry at all, even if
|
||
there is a DT_SONAME entry. */
|
||
add_needed = TRUE;
|
||
name = bfd_get_filename (abfd);
|
||
if (elf_dt_name (abfd) != NULL)
|
||
{
|
||
name = elf_dt_name (abfd);
|
||
if (*name == '\0')
|
||
{
|
||
if (elf_dt_soname (abfd) != NULL)
|
||
dt_needed = TRUE;
|
||
|
||
add_needed = FALSE;
|
||
}
|
||
}
|
||
s = bfd_get_section_by_name (abfd, ".dynamic");
|
||
if (s != NULL)
|
||
{
|
||
Elf_External_Dyn *dynbuf = NULL;
|
||
Elf_External_Dyn *extdyn;
|
||
Elf_External_Dyn *extdynend;
|
||
int elfsec;
|
||
unsigned long shlink;
|
||
|
||
dynbuf = bfd_malloc (s->_raw_size);
|
||
if (dynbuf == NULL)
|
||
goto error_return;
|
||
|
||
if (! bfd_get_section_contents (abfd, s, dynbuf, 0, s->_raw_size))
|
||
goto error_free_dyn;
|
||
|
||
elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
|
||
if (elfsec == -1)
|
||
goto error_free_dyn;
|
||
shlink = elf_elfsections (abfd)[elfsec]->sh_link;
|
||
|
||
extdyn = dynbuf;
|
||
extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
|
||
for (; extdyn < extdynend; extdyn++)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
elf_swap_dyn_in (abfd, extdyn, &dyn);
|
||
if (dyn.d_tag == DT_SONAME)
|
||
{
|
||
unsigned int tagv = dyn.d_un.d_val;
|
||
name = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
|
||
if (name == NULL)
|
||
goto error_free_dyn;
|
||
}
|
||
if (dyn.d_tag == DT_NEEDED)
|
||
{
|
||
struct bfd_link_needed_list *n, **pn;
|
||
char *fnm, *anm;
|
||
unsigned int tagv = dyn.d_un.d_val;
|
||
|
||
amt = sizeof (struct bfd_link_needed_list);
|
||
n = bfd_alloc (abfd, amt);
|
||
fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
|
||
if (n == NULL || fnm == NULL)
|
||
goto error_free_dyn;
|
||
amt = strlen (fnm) + 1;
|
||
anm = bfd_alloc (abfd, amt);
|
||
if (anm == NULL)
|
||
goto error_free_dyn;
|
||
memcpy (anm, fnm, amt);
|
||
n->name = anm;
|
||
n->by = abfd;
|
||
n->next = NULL;
|
||
for (pn = & hash_table->needed;
|
||
*pn != NULL;
|
||
pn = &(*pn)->next)
|
||
;
|
||
*pn = n;
|
||
}
|
||
if (dyn.d_tag == DT_RUNPATH)
|
||
{
|
||
struct bfd_link_needed_list *n, **pn;
|
||
char *fnm, *anm;
|
||
unsigned int tagv = dyn.d_un.d_val;
|
||
|
||
amt = sizeof (struct bfd_link_needed_list);
|
||
n = bfd_alloc (abfd, amt);
|
||
fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
|
||
if (n == NULL || fnm == NULL)
|
||
goto error_free_dyn;
|
||
amt = strlen (fnm) + 1;
|
||
anm = bfd_alloc (abfd, amt);
|
||
if (anm == NULL)
|
||
goto error_free_dyn;
|
||
memcpy (anm, fnm, amt);
|
||
n->name = anm;
|
||
n->by = abfd;
|
||
n->next = NULL;
|
||
for (pn = & runpath;
|
||
*pn != NULL;
|
||
pn = &(*pn)->next)
|
||
;
|
||
*pn = n;
|
||
}
|
||
/* Ignore DT_RPATH if we have seen DT_RUNPATH. */
|
||
if (!runpath && dyn.d_tag == DT_RPATH)
|
||
{
|
||
struct bfd_link_needed_list *n, **pn;
|
||
char *fnm, *anm;
|
||
unsigned int tagv = dyn.d_un.d_val;
|
||
|
||
amt = sizeof (struct bfd_link_needed_list);
|
||
n = bfd_alloc (abfd, amt);
|
||
fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
|
||
if (n == NULL || fnm == NULL)
|
||
goto error_free_dyn;
|
||
amt = strlen (fnm) + 1;
|
||
anm = bfd_alloc (abfd, amt);
|
||
if (anm == NULL)
|
||
{
|
||
error_free_dyn:
|
||
free (dynbuf);
|
||
goto error_return;
|
||
}
|
||
memcpy (anm, fnm, amt);
|
||
n->name = anm;
|
||
n->by = abfd;
|
||
n->next = NULL;
|
||
for (pn = & rpath;
|
||
*pn != NULL;
|
||
pn = &(*pn)->next)
|
||
;
|
||
*pn = n;
|
||
}
|
||
}
|
||
|
||
free (dynbuf);
|
||
}
|
||
|
||
/* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
|
||
frees all more recently bfd_alloc'd blocks as well. */
|
||
if (runpath)
|
||
rpath = runpath;
|
||
|
||
if (rpath)
|
||
{
|
||
struct bfd_link_needed_list **pn;
|
||
for (pn = & hash_table->runpath;
|
||
*pn != NULL;
|
||
pn = &(*pn)->next)
|
||
;
|
||
*pn = rpath;
|
||
}
|
||
|
||
/* We do not want to include any of the sections in a dynamic
|
||
object in the output file. We hack by simply clobbering the
|
||
list of sections in the BFD. This could be handled more
|
||
cleanly by, say, a new section flag; the existing
|
||
SEC_NEVER_LOAD flag is not the one we want, because that one
|
||
still implies that the section takes up space in the output
|
||
file. */
|
||
bfd_section_list_clear (abfd);
|
||
|
||
/* If this is the first dynamic object found in the link, create
|
||
the special sections required for dynamic linking. */
|
||
if (! hash_table->dynamic_sections_created)
|
||
if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
|
||
goto error_return;
|
||
|
||
if (add_needed)
|
||
{
|
||
/* Add a DT_NEEDED entry for this dynamic object. */
|
||
oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
|
||
strindex = _bfd_elf_strtab_add (hash_table->dynstr, name, FALSE);
|
||
if (strindex == (bfd_size_type) -1)
|
||
goto error_return;
|
||
|
||
if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
|
||
{
|
||
asection *sdyn;
|
||
Elf_External_Dyn *dyncon, *dynconend;
|
||
|
||
/* The hash table size did not change, which means that
|
||
the dynamic object name was already entered. If we
|
||
have already included this dynamic object in the
|
||
link, just ignore it. There is no reason to include
|
||
a particular dynamic object more than once. */
|
||
sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
|
||
BFD_ASSERT (sdyn != NULL);
|
||
|
||
dyncon = (Elf_External_Dyn *) sdyn->contents;
|
||
dynconend = (Elf_External_Dyn *) (sdyn->contents +
|
||
sdyn->_raw_size);
|
||
for (; dyncon < dynconend; dyncon++)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
elf_swap_dyn_in (hash_table->dynobj, dyncon, & dyn);
|
||
if (dyn.d_tag == DT_NEEDED
|
||
&& dyn.d_un.d_val == strindex)
|
||
{
|
||
_bfd_elf_strtab_delref (hash_table->dynstr, strindex);
|
||
return TRUE;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
|
||
goto error_return;
|
||
}
|
||
|
||
/* Save the SONAME, if there is one, because sometimes the
|
||
linker emulation code will need to know it. */
|
||
if (*name == '\0')
|
||
name = basename (bfd_get_filename (abfd));
|
||
elf_dt_name (abfd) = name;
|
||
}
|
||
|
||
/* If this is a dynamic object, we always link against the .dynsym
|
||
symbol table, not the .symtab symbol table. The dynamic linker
|
||
will only see the .dynsym symbol table, so there is no reason to
|
||
look at .symtab for a dynamic object. */
|
||
|
||
if (! dynamic || elf_dynsymtab (abfd) == 0)
|
||
hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
else
|
||
hdr = &elf_tdata (abfd)->dynsymtab_hdr;
|
||
|
||
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
|
||
|
||
/* The sh_info field of the symtab header tells us where the
|
||
external symbols start. We don't care about the local symbols at
|
||
this point. */
|
||
if (elf_bad_symtab (abfd))
|
||
{
|
||
extsymcount = symcount;
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
{
|
||
extsymcount = symcount - hdr->sh_info;
|
||
extsymoff = hdr->sh_info;
|
||
}
|
||
|
||
sym_hash = NULL;
|
||
if (extsymcount != 0)
|
||
{
|
||
isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
|
||
NULL, NULL, NULL);
|
||
if (isymbuf == NULL)
|
||
goto error_return;
|
||
|
||
/* We store a pointer to the hash table entry for each external
|
||
symbol. */
|
||
amt = extsymcount * sizeof (struct elf_link_hash_entry *);
|
||
sym_hash = bfd_alloc (abfd, amt);
|
||
if (sym_hash == NULL)
|
||
goto error_free_sym;
|
||
elf_sym_hashes (abfd) = sym_hash;
|
||
}
|
||
|
||
if (dynamic)
|
||
{
|
||
/* Read in any version definitions. */
|
||
if (! _bfd_elf_slurp_version_tables (abfd))
|
||
goto error_free_sym;
|
||
|
||
/* Read in the symbol versions, but don't bother to convert them
|
||
to internal format. */
|
||
if (elf_dynversym (abfd) != 0)
|
||
{
|
||
Elf_Internal_Shdr *versymhdr;
|
||
|
||
versymhdr = &elf_tdata (abfd)->dynversym_hdr;
|
||
extversym = bfd_malloc (versymhdr->sh_size);
|
||
if (extversym == NULL)
|
||
goto error_free_sym;
|
||
amt = versymhdr->sh_size;
|
||
if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
|
||
|| bfd_bread (extversym, amt, abfd) != amt)
|
||
goto error_free_vers;
|
||
}
|
||
}
|
||
|
||
weaks = NULL;
|
||
|
||
ever = extversym != NULL ? extversym + extsymoff : NULL;
|
||
for (isym = isymbuf, isymend = isymbuf + extsymcount;
|
||
isym < isymend;
|
||
isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
|
||
{
|
||
int bind;
|
||
bfd_vma value;
|
||
asection *sec;
|
||
flagword flags;
|
||
const char *name;
|
||
struct elf_link_hash_entry *h;
|
||
bfd_boolean definition;
|
||
bfd_boolean size_change_ok;
|
||
bfd_boolean type_change_ok;
|
||
bfd_boolean new_weakdef;
|
||
bfd_boolean override;
|
||
unsigned int old_alignment;
|
||
bfd *old_bfd;
|
||
|
||
override = FALSE;
|
||
|
||
flags = BSF_NO_FLAGS;
|
||
sec = NULL;
|
||
value = isym->st_value;
|
||
*sym_hash = NULL;
|
||
|
||
bind = ELF_ST_BIND (isym->st_info);
|
||
if (bind == STB_LOCAL)
|
||
{
|
||
/* This should be impossible, since ELF requires that all
|
||
global symbols follow all local symbols, and that sh_info
|
||
point to the first global symbol. Unfortunatealy, Irix 5
|
||
screws this up. */
|
||
continue;
|
||
}
|
||
else if (bind == STB_GLOBAL)
|
||
{
|
||
if (isym->st_shndx != SHN_UNDEF
|
||
&& isym->st_shndx != SHN_COMMON)
|
||
flags = BSF_GLOBAL;
|
||
}
|
||
else if (bind == STB_WEAK)
|
||
flags = BSF_WEAK;
|
||
else
|
||
{
|
||
/* Leave it up to the processor backend. */
|
||
}
|
||
|
||
if (isym->st_shndx == SHN_UNDEF)
|
||
sec = bfd_und_section_ptr;
|
||
else if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
|
||
{
|
||
sec = section_from_elf_index (abfd, isym->st_shndx);
|
||
if (sec == NULL)
|
||
sec = bfd_abs_section_ptr;
|
||
else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
|
||
value -= sec->vma;
|
||
}
|
||
else if (isym->st_shndx == SHN_ABS)
|
||
sec = bfd_abs_section_ptr;
|
||
else if (isym->st_shndx == SHN_COMMON)
|
||
{
|
||
sec = bfd_com_section_ptr;
|
||
/* What ELF calls the size we call the value. What ELF
|
||
calls the value we call the alignment. */
|
||
value = isym->st_size;
|
||
}
|
||
else
|
||
{
|
||
/* Leave it up to the processor backend. */
|
||
}
|
||
|
||
name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
|
||
isym->st_name);
|
||
if (name == NULL)
|
||
goto error_free_vers;
|
||
|
||
if (isym->st_shndx == SHN_COMMON
|
||
&& ELF_ST_TYPE (isym->st_info) == STT_TLS)
|
||
{
|
||
asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
|
||
|
||
if (tcomm == NULL)
|
||
{
|
||
tcomm = bfd_make_section (abfd, ".tcommon");
|
||
if (tcomm == NULL
|
||
|| !bfd_set_section_flags (abfd, tcomm, (SEC_ALLOC
|
||
| SEC_IS_COMMON
|
||
| SEC_LINKER_CREATED
|
||
| SEC_THREAD_LOCAL)))
|
||
goto error_free_vers;
|
||
}
|
||
sec = tcomm;
|
||
}
|
||
else if (add_symbol_hook)
|
||
{
|
||
if (! (*add_symbol_hook) (abfd, info, isym, &name, &flags, &sec,
|
||
&value))
|
||
goto error_free_vers;
|
||
|
||
/* The hook function sets the name to NULL if this symbol
|
||
should be skipped for some reason. */
|
||
if (name == NULL)
|
||
continue;
|
||
}
|
||
|
||
/* Sanity check that all possibilities were handled. */
|
||
if (sec == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_free_vers;
|
||
}
|
||
|
||
if (bfd_is_und_section (sec)
|
||
|| bfd_is_com_section (sec))
|
||
definition = FALSE;
|
||
else
|
||
definition = TRUE;
|
||
|
||
size_change_ok = FALSE;
|
||
type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
|
||
old_alignment = 0;
|
||
old_bfd = NULL;
|
||
|
||
if (info->hash->creator->flavour == bfd_target_elf_flavour)
|
||
{
|
||
Elf_Internal_Versym iver;
|
||
unsigned int vernum = 0;
|
||
bfd_boolean skip;
|
||
|
||
if (ever != NULL)
|
||
{
|
||
_bfd_elf_swap_versym_in (abfd, ever, &iver);
|
||
vernum = iver.vs_vers & VERSYM_VERSION;
|
||
|
||
/* If this is a hidden symbol, or if it is not version
|
||
1, we append the version name to the symbol name.
|
||
However, we do not modify a non-hidden absolute
|
||
symbol, because it might be the version symbol
|
||
itself. FIXME: What if it isn't? */
|
||
if ((iver.vs_vers & VERSYM_HIDDEN) != 0
|
||
|| (vernum > 1 && ! bfd_is_abs_section (sec)))
|
||
{
|
||
const char *verstr;
|
||
size_t namelen, verlen, newlen;
|
||
char *newname, *p;
|
||
|
||
if (isym->st_shndx != SHN_UNDEF)
|
||
{
|
||
if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: %s: invalid version %u (max %d)"),
|
||
bfd_archive_filename (abfd), name, vernum,
|
||
elf_tdata (abfd)->dynverdef_hdr.sh_info);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_free_vers;
|
||
}
|
||
else if (vernum > 1)
|
||
verstr =
|
||
elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
|
||
else
|
||
verstr = "";
|
||
}
|
||
else
|
||
{
|
||
/* We cannot simply test for the number of
|
||
entries in the VERNEED section since the
|
||
numbers for the needed versions do not start
|
||
at 0. */
|
||
Elf_Internal_Verneed *t;
|
||
|
||
verstr = NULL;
|
||
for (t = elf_tdata (abfd)->verref;
|
||
t != NULL;
|
||
t = t->vn_nextref)
|
||
{
|
||
Elf_Internal_Vernaux *a;
|
||
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
{
|
||
if (a->vna_other == vernum)
|
||
{
|
||
verstr = a->vna_nodename;
|
||
break;
|
||
}
|
||
}
|
||
if (a != NULL)
|
||
break;
|
||
}
|
||
if (verstr == NULL)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: %s: invalid needed version %d"),
|
||
bfd_archive_filename (abfd), name, vernum);
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_free_vers;
|
||
}
|
||
}
|
||
|
||
namelen = strlen (name);
|
||
verlen = strlen (verstr);
|
||
newlen = namelen + verlen + 2;
|
||
if ((iver.vs_vers & VERSYM_HIDDEN) == 0
|
||
&& isym->st_shndx != SHN_UNDEF)
|
||
++newlen;
|
||
|
||
newname = bfd_alloc (abfd, newlen);
|
||
if (newname == NULL)
|
||
goto error_free_vers;
|
||
memcpy (newname, name, namelen);
|
||
p = newname + namelen;
|
||
*p++ = ELF_VER_CHR;
|
||
/* If this is a defined non-hidden version symbol,
|
||
we add another @ to the name. This indicates the
|
||
default version of the symbol. */
|
||
if ((iver.vs_vers & VERSYM_HIDDEN) == 0
|
||
&& isym->st_shndx != SHN_UNDEF)
|
||
*p++ = ELF_VER_CHR;
|
||
memcpy (p, verstr, verlen + 1);
|
||
|
||
name = newname;
|
||
}
|
||
}
|
||
|
||
if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
|
||
sym_hash, &skip, &override,
|
||
&type_change_ok, &size_change_ok,
|
||
dt_needed))
|
||
goto error_free_vers;
|
||
|
||
if (skip)
|
||
continue;
|
||
|
||
if (override)
|
||
definition = FALSE;
|
||
|
||
h = *sym_hash;
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* Remember the old alignment if this is a common symbol, so
|
||
that we don't reduce the alignment later on. We can't
|
||
check later, because _bfd_generic_link_add_one_symbol
|
||
will set a default for the alignment which we want to
|
||
override. We also remember the old bfd where the existing
|
||
definition comes from. */
|
||
switch (h->root.type)
|
||
{
|
||
default:
|
||
break;
|
||
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
old_bfd = h->root.u.def.section->owner;
|
||
break;
|
||
|
||
case bfd_link_hash_common:
|
||
old_bfd = h->root.u.c.p->section->owner;
|
||
old_alignment = h->root.u.c.p->alignment_power;
|
||
break;
|
||
}
|
||
|
||
if (elf_tdata (abfd)->verdef != NULL
|
||
&& ! override
|
||
&& vernum > 1
|
||
&& definition)
|
||
h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
|
||
}
|
||
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, abfd, name, flags, sec, value, NULL, FALSE, collect,
|
||
(struct bfd_link_hash_entry **) sym_hash)))
|
||
goto error_free_vers;
|
||
|
||
h = *sym_hash;
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
*sym_hash = h;
|
||
|
||
new_weakdef = FALSE;
|
||
if (dynamic
|
||
&& definition
|
||
&& (flags & BSF_WEAK) != 0
|
||
&& ELF_ST_TYPE (isym->st_info) != STT_FUNC
|
||
&& info->hash->creator->flavour == bfd_target_elf_flavour
|
||
&& h->weakdef == NULL)
|
||
{
|
||
/* Keep a list of all weak defined non function symbols from
|
||
a dynamic object, using the weakdef field. Later in this
|
||
function we will set the weakdef field to the correct
|
||
value. We only put non-function symbols from dynamic
|
||
objects on this list, because that happens to be the only
|
||
time we need to know the normal symbol corresponding to a
|
||
weak symbol, and the information is time consuming to
|
||
figure out. If the weakdef field is not already NULL,
|
||
then this symbol was already defined by some previous
|
||
dynamic object, and we will be using that previous
|
||
definition anyhow. */
|
||
|
||
h->weakdef = weaks;
|
||
weaks = h;
|
||
new_weakdef = TRUE;
|
||
}
|
||
|
||
/* Set the alignment of a common symbol. */
|
||
if (isym->st_shndx == SHN_COMMON
|
||
&& h->root.type == bfd_link_hash_common)
|
||
{
|
||
unsigned int align;
|
||
|
||
align = bfd_log2 (isym->st_value);
|
||
if (align > old_alignment
|
||
/* Permit an alignment power of zero if an alignment of one
|
||
is specified and no other alignments have been specified. */
|
||
|| (isym->st_value == 1 && old_alignment == 0))
|
||
h->root.u.c.p->alignment_power = align;
|
||
else
|
||
h->root.u.c.p->alignment_power = old_alignment;
|
||
}
|
||
|
||
if (info->hash->creator->flavour == bfd_target_elf_flavour)
|
||
{
|
||
int old_flags;
|
||
bfd_boolean dynsym;
|
||
int new_flag;
|
||
|
||
/* Check the alignment when a common symbol is involved. This
|
||
can change when a common symbol is overriden by a normal
|
||
definition or a common symbol is ignored due to the old
|
||
normal definition. We need to make sure the maximum
|
||
alignment is maintained. */
|
||
if ((old_alignment || isym->st_shndx == SHN_COMMON)
|
||
&& h->root.type != bfd_link_hash_common)
|
||
{
|
||
unsigned int common_align;
|
||
unsigned int normal_align;
|
||
unsigned int symbol_align;
|
||
bfd *normal_bfd;
|
||
bfd *common_bfd;
|
||
|
||
symbol_align = ffs (h->root.u.def.value) - 1;
|
||
if ((h->root.u.def.section->owner->flags & DYNAMIC) == 0)
|
||
{
|
||
normal_align = h->root.u.def.section->alignment_power;
|
||
if (normal_align > symbol_align)
|
||
normal_align = symbol_align;
|
||
}
|
||
else
|
||
normal_align = symbol_align;
|
||
|
||
if (old_alignment)
|
||
{
|
||
common_align = old_alignment;
|
||
common_bfd = old_bfd;
|
||
normal_bfd = abfd;
|
||
}
|
||
else
|
||
{
|
||
common_align = bfd_log2 (isym->st_value);
|
||
common_bfd = abfd;
|
||
normal_bfd = old_bfd;
|
||
}
|
||
|
||
if (normal_align < common_align)
|
||
(*_bfd_error_handler)
|
||
(_("Warning: alignment %u of symbol `%s' in %s is smaller than %u in %s"),
|
||
1 << normal_align,
|
||
name,
|
||
bfd_archive_filename (normal_bfd),
|
||
1 << common_align,
|
||
bfd_archive_filename (common_bfd));
|
||
}
|
||
|
||
/* Remember the symbol size and type. */
|
||
if (isym->st_size != 0
|
||
&& (definition || h->size == 0))
|
||
{
|
||
if (h->size != 0 && h->size != isym->st_size && ! size_change_ok)
|
||
(*_bfd_error_handler)
|
||
(_("Warning: size of symbol `%s' changed from %lu in %s to %lu in %s"),
|
||
name, (unsigned long) h->size,
|
||
bfd_archive_filename (old_bfd),
|
||
(unsigned long) isym->st_size,
|
||
bfd_archive_filename (abfd));
|
||
|
||
h->size = isym->st_size;
|
||
}
|
||
|
||
/* If this is a common symbol, then we always want H->SIZE
|
||
to be the size of the common symbol. The code just above
|
||
won't fix the size if a common symbol becomes larger. We
|
||
don't warn about a size change here, because that is
|
||
covered by --warn-common. */
|
||
if (h->root.type == bfd_link_hash_common)
|
||
h->size = h->root.u.c.size;
|
||
|
||
if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
|
||
&& (definition || h->type == STT_NOTYPE))
|
||
{
|
||
if (h->type != STT_NOTYPE
|
||
&& h->type != ELF_ST_TYPE (isym->st_info)
|
||
&& ! type_change_ok)
|
||
(*_bfd_error_handler)
|
||
(_("Warning: type of symbol `%s' changed from %d to %d in %s"),
|
||
name, h->type, ELF_ST_TYPE (isym->st_info),
|
||
bfd_archive_filename (abfd));
|
||
|
||
h->type = ELF_ST_TYPE (isym->st_info);
|
||
}
|
||
|
||
/* If st_other has a processor-specific meaning, specific
|
||
code might be needed here. We never merge the visibility
|
||
attribute with the one from a dynamic object. */
|
||
if (isym->st_other != 0 && !dynamic)
|
||
{
|
||
unsigned char hvis, symvis, other, nvis;
|
||
|
||
/* Take the balance of OTHER from the definition. */
|
||
other = (definition ? isym->st_other : h->other);
|
||
other &= ~ ELF_ST_VISIBILITY (-1);
|
||
|
||
/* Combine visibilities, using the most constraining one. */
|
||
hvis = ELF_ST_VISIBILITY (h->other);
|
||
symvis = ELF_ST_VISIBILITY (isym->st_other);
|
||
if (! hvis)
|
||
nvis = symvis;
|
||
else if (! symvis)
|
||
nvis = hvis;
|
||
else
|
||
nvis = hvis < symvis ? hvis : symvis;
|
||
|
||
h->other = other | nvis;
|
||
}
|
||
|
||
/* Set a flag in the hash table entry indicating the type of
|
||
reference or definition we just found. Keep a count of
|
||
the number of dynamic symbols we find. A dynamic symbol
|
||
is one which is referenced or defined by both a regular
|
||
object and a shared object. */
|
||
old_flags = h->elf_link_hash_flags;
|
||
dynsym = FALSE;
|
||
if (! dynamic)
|
||
{
|
||
if (! definition)
|
||
{
|
||
new_flag = ELF_LINK_HASH_REF_REGULAR;
|
||
if (bind != STB_WEAK)
|
||
new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK;
|
||
}
|
||
else
|
||
new_flag = ELF_LINK_HASH_DEF_REGULAR;
|
||
if (! info->executable
|
||
|| (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
|
||
| ELF_LINK_HASH_REF_DYNAMIC)) != 0)
|
||
dynsym = TRUE;
|
||
}
|
||
else
|
||
{
|
||
if (! definition)
|
||
new_flag = ELF_LINK_HASH_REF_DYNAMIC;
|
||
else
|
||
new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
|
||
if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
|
||
| ELF_LINK_HASH_REF_REGULAR)) != 0
|
||
|| (h->weakdef != NULL
|
||
&& ! new_weakdef
|
||
&& h->weakdef->dynindx != -1))
|
||
dynsym = TRUE;
|
||
}
|
||
|
||
h->elf_link_hash_flags |= new_flag;
|
||
|
||
/* Check to see if we need to add an indirect symbol for
|
||
the default name. */
|
||
if (definition || h->root.type == bfd_link_hash_common)
|
||
if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
|
||
&sec, &value, &dynsym,
|
||
override, dt_needed))
|
||
goto error_free_vers;
|
||
|
||
if (definition && !dynamic)
|
||
{
|
||
char *p = strchr (name, ELF_VER_CHR);
|
||
if (p != NULL && p[1] != ELF_VER_CHR)
|
||
{
|
||
/* Queue non-default versions so that .symver x, x@FOO
|
||
aliases can be checked. */
|
||
if (! nondeflt_vers)
|
||
{
|
||
amt = (isymend - isym + 1)
|
||
* sizeof (struct elf_link_hash_entry *);
|
||
nondeflt_vers = bfd_malloc (amt);
|
||
}
|
||
nondeflt_vers [nondeflt_vers_cnt++] = h;
|
||
}
|
||
}
|
||
|
||
if (dynsym && h->dynindx == -1)
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info, h))
|
||
goto error_free_vers;
|
||
if (h->weakdef != NULL
|
||
&& ! new_weakdef
|
||
&& h->weakdef->dynindx == -1)
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
|
||
goto error_free_vers;
|
||
}
|
||
}
|
||
else if (dynsym && h->dynindx != -1)
|
||
/* If the symbol already has a dynamic index, but
|
||
visibility says it should not be visible, turn it into
|
||
a local symbol. */
|
||
switch (ELF_ST_VISIBILITY (h->other))
|
||
{
|
||
case STV_INTERNAL:
|
||
case STV_HIDDEN:
|
||
(*bed->elf_backend_hide_symbol) (info, h, TRUE);
|
||
break;
|
||
}
|
||
|
||
if (dt_needed && definition
|
||
&& (h->elf_link_hash_flags
|
||
& ELF_LINK_HASH_REF_REGULAR) != 0)
|
||
{
|
||
bfd_size_type oldsize;
|
||
bfd_size_type strindex;
|
||
|
||
if (! is_elf_hash_table (info))
|
||
goto error_free_vers;
|
||
|
||
/* The symbol from a DT_NEEDED object is referenced from
|
||
the regular object to create a dynamic executable. We
|
||
have to make sure there is a DT_NEEDED entry for it. */
|
||
|
||
dt_needed = FALSE;
|
||
oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
|
||
strindex = _bfd_elf_strtab_add (hash_table->dynstr,
|
||
elf_dt_soname (abfd), FALSE);
|
||
if (strindex == (bfd_size_type) -1)
|
||
goto error_free_vers;
|
||
|
||
if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
|
||
{
|
||
asection *sdyn;
|
||
Elf_External_Dyn *dyncon, *dynconend;
|
||
|
||
sdyn = bfd_get_section_by_name (hash_table->dynobj,
|
||
".dynamic");
|
||
BFD_ASSERT (sdyn != NULL);
|
||
|
||
dyncon = (Elf_External_Dyn *) sdyn->contents;
|
||
dynconend = (Elf_External_Dyn *) (sdyn->contents +
|
||
sdyn->_raw_size);
|
||
for (; dyncon < dynconend; dyncon++)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
elf_swap_dyn_in (hash_table->dynobj,
|
||
dyncon, &dyn);
|
||
BFD_ASSERT (dyn.d_tag != DT_NEEDED ||
|
||
dyn.d_un.d_val != strindex);
|
||
}
|
||
}
|
||
|
||
if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
|
||
goto error_free_vers;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Now that all the symbols from this input file are created, handle
|
||
.symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
|
||
if (nondeflt_vers != NULL)
|
||
{
|
||
bfd_size_type cnt, symidx;
|
||
|
||
for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
|
||
{
|
||
struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
|
||
char *shortname, *p;
|
||
|
||
p = strchr (h->root.root.string, ELF_VER_CHR);
|
||
if (p == NULL
|
||
|| (h->root.type != bfd_link_hash_defined
|
||
&& h->root.type != bfd_link_hash_defweak))
|
||
continue;
|
||
|
||
amt = p - h->root.root.string;
|
||
shortname = bfd_malloc (amt + 1);
|
||
memcpy (shortname, h->root.root.string, amt);
|
||
shortname[amt] = '\0';
|
||
|
||
hi = (struct elf_link_hash_entry *)
|
||
bfd_link_hash_lookup (info->hash, shortname,
|
||
FALSE, FALSE, FALSE);
|
||
if (hi != NULL
|
||
&& hi->root.type == h->root.type
|
||
&& hi->root.u.def.value == h->root.u.def.value
|
||
&& hi->root.u.def.section == h->root.u.def.section)
|
||
{
|
||
(*bed->elf_backend_hide_symbol) (info, hi, TRUE);
|
||
hi->root.type = bfd_link_hash_indirect;
|
||
hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
|
||
(*bed->elf_backend_copy_indirect_symbol) (bed, h, hi);
|
||
sym_hash = elf_sym_hashes (abfd);
|
||
if (sym_hash)
|
||
for (symidx = 0; symidx < extsymcount; ++symidx)
|
||
if (sym_hash[symidx] == hi)
|
||
{
|
||
sym_hash[symidx] = h;
|
||
break;
|
||
}
|
||
}
|
||
free (shortname);
|
||
}
|
||
free (nondeflt_vers);
|
||
nondeflt_vers = NULL;
|
||
}
|
||
|
||
if (extversym != NULL)
|
||
{
|
||
free (extversym);
|
||
extversym = NULL;
|
||
}
|
||
|
||
if (isymbuf != NULL)
|
||
free (isymbuf);
|
||
isymbuf = NULL;
|
||
|
||
/* Now set the weakdefs field correctly for all the weak defined
|
||
symbols we found. The only way to do this is to search all the
|
||
symbols. Since we only need the information for non functions in
|
||
dynamic objects, that's the only time we actually put anything on
|
||
the list WEAKS. We need this information so that if a regular
|
||
object refers to a symbol defined weakly in a dynamic object, the
|
||
real symbol in the dynamic object is also put in the dynamic
|
||
symbols; we also must arrange for both symbols to point to the
|
||
same memory location. We could handle the general case of symbol
|
||
aliasing, but a general symbol alias can only be generated in
|
||
assembler code, handling it correctly would be very time
|
||
consuming, and other ELF linkers don't handle general aliasing
|
||
either. */
|
||
while (weaks != NULL)
|
||
{
|
||
struct elf_link_hash_entry *hlook;
|
||
asection *slook;
|
||
bfd_vma vlook;
|
||
struct elf_link_hash_entry **hpp;
|
||
struct elf_link_hash_entry **hppend;
|
||
|
||
hlook = weaks;
|
||
weaks = hlook->weakdef;
|
||
hlook->weakdef = NULL;
|
||
|
||
BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
|
||
|| hlook->root.type == bfd_link_hash_defweak
|
||
|| hlook->root.type == bfd_link_hash_common
|
||
|| hlook->root.type == bfd_link_hash_indirect);
|
||
slook = hlook->root.u.def.section;
|
||
vlook = hlook->root.u.def.value;
|
||
|
||
hpp = elf_sym_hashes (abfd);
|
||
hppend = hpp + extsymcount;
|
||
for (; hpp < hppend; hpp++)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = *hpp;
|
||
if (h != NULL && h != hlook
|
||
&& h->root.type == bfd_link_hash_defined
|
||
&& h->root.u.def.section == slook
|
||
&& h->root.u.def.value == vlook)
|
||
{
|
||
hlook->weakdef = h;
|
||
|
||
/* If the weak definition is in the list of dynamic
|
||
symbols, make sure the real definition is put there
|
||
as well. */
|
||
if (hlook->dynindx != -1
|
||
&& h->dynindx == -1)
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info, h))
|
||
goto error_return;
|
||
}
|
||
|
||
/* If the real definition is in the list of dynamic
|
||
symbols, make sure the weak definition is put there
|
||
as well. If we don't do this, then the dynamic
|
||
loader might not merge the entries for the real
|
||
definition and the weak definition. */
|
||
if (h->dynindx != -1
|
||
&& hlook->dynindx == -1)
|
||
{
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
|
||
goto error_return;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* If this object is the same format as the output object, and it is
|
||
not a shared library, then let the backend look through the
|
||
relocs.
|
||
|
||
This is required to build global offset table entries and to
|
||
arrange for dynamic relocs. It is not required for the
|
||
particular common case of linking non PIC code, even when linking
|
||
against shared libraries, but unfortunately there is no way of
|
||
knowing whether an object file has been compiled PIC or not.
|
||
Looking through the relocs is not particularly time consuming.
|
||
The problem is that we must either (1) keep the relocs in memory,
|
||
which causes the linker to require additional runtime memory or
|
||
(2) read the relocs twice from the input file, which wastes time.
|
||
This would be a good case for using mmap.
|
||
|
||
I have no idea how to handle linking PIC code into a file of a
|
||
different format. It probably can't be done. */
|
||
check_relocs = get_elf_backend_data (abfd)->check_relocs;
|
||
if (! dynamic
|
||
&& abfd->xvec == info->hash->creator
|
||
&& check_relocs != NULL)
|
||
{
|
||
asection *o;
|
||
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
Elf_Internal_Rela *internal_relocs;
|
||
bfd_boolean ok;
|
||
|
||
if ((o->flags & SEC_RELOC) == 0
|
||
|| o->reloc_count == 0
|
||
|| ((info->strip == strip_all || info->strip == strip_debugger)
|
||
&& (o->flags & SEC_DEBUGGING) != 0)
|
||
|| bfd_is_abs_section (o->output_section))
|
||
continue;
|
||
|
||
internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
|
||
info->keep_memory);
|
||
if (internal_relocs == NULL)
|
||
goto error_return;
|
||
|
||
ok = (*check_relocs) (abfd, info, o, internal_relocs);
|
||
|
||
if (elf_section_data (o)->relocs != internal_relocs)
|
||
free (internal_relocs);
|
||
|
||
if (! ok)
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
/* If this is a non-traditional link, try to optimize the handling
|
||
of the .stab/.stabstr sections. */
|
||
if (! dynamic
|
||
&& ! info->traditional_format
|
||
&& info->hash->creator->flavour == bfd_target_elf_flavour
|
||
&& is_elf_hash_table (info)
|
||
&& (info->strip != strip_all && info->strip != strip_debugger))
|
||
{
|
||
asection *stab, *stabstr;
|
||
|
||
stab = bfd_get_section_by_name (abfd, ".stab");
|
||
if (stab != NULL
|
||
&& (stab->flags & SEC_MERGE) == 0
|
||
&& !bfd_is_abs_section (stab->output_section))
|
||
{
|
||
stabstr = bfd_get_section_by_name (abfd, ".stabstr");
|
||
|
||
if (stabstr != NULL)
|
||
{
|
||
struct bfd_elf_section_data *secdata;
|
||
|
||
secdata = elf_section_data (stab);
|
||
if (! _bfd_link_section_stabs (abfd,
|
||
& hash_table->stab_info,
|
||
stab, stabstr,
|
||
&secdata->sec_info))
|
||
goto error_return;
|
||
if (secdata->sec_info)
|
||
stab->sec_info_type = ELF_INFO_TYPE_STABS;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (! info->relocatable && ! dynamic
|
||
&& is_elf_hash_table (info))
|
||
{
|
||
asection *s;
|
||
|
||
for (s = abfd->sections; s != NULL; s = s->next)
|
||
if ((s->flags & SEC_MERGE) != 0
|
||
&& !bfd_is_abs_section (s->output_section))
|
||
{
|
||
struct bfd_elf_section_data *secdata;
|
||
|
||
secdata = elf_section_data (s);
|
||
if (! _bfd_merge_section (abfd,
|
||
& hash_table->merge_info,
|
||
s, &secdata->sec_info))
|
||
goto error_return;
|
||
else if (secdata->sec_info)
|
||
s->sec_info_type = ELF_INFO_TYPE_MERGE;
|
||
}
|
||
}
|
||
|
||
if (is_elf_hash_table (info))
|
||
{
|
||
/* Add this bfd to the loaded list. */
|
||
struct elf_link_loaded_list *n;
|
||
|
||
n = bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
|
||
if (n == NULL)
|
||
goto error_return;
|
||
n->abfd = abfd;
|
||
n->next = hash_table->loaded;
|
||
hash_table->loaded = n;
|
||
}
|
||
|
||
return TRUE;
|
||
|
||
error_free_vers:
|
||
if (nondeflt_vers != NULL)
|
||
free (nondeflt_vers);
|
||
if (extversym != NULL)
|
||
free (extversym);
|
||
error_free_sym:
|
||
if (isymbuf != NULL)
|
||
free (isymbuf);
|
||
error_return:
|
||
return FALSE;
|
||
}
|
||
|
||
/* Add an entry to the .dynamic table. */
|
||
|
||
bfd_boolean
|
||
elf_add_dynamic_entry (struct bfd_link_info *info, bfd_vma tag, bfd_vma val)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
bfd *dynobj;
|
||
asection *s;
|
||
bfd_size_type newsize;
|
||
bfd_byte *newcontents;
|
||
|
||
if (! is_elf_hash_table (info))
|
||
return FALSE;
|
||
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
|
||
s = bfd_get_section_by_name (dynobj, ".dynamic");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
newsize = s->_raw_size + sizeof (Elf_External_Dyn);
|
||
newcontents = bfd_realloc (s->contents, newsize);
|
||
if (newcontents == NULL)
|
||
return FALSE;
|
||
|
||
dyn.d_tag = tag;
|
||
dyn.d_un.d_val = val;
|
||
elf_swap_dyn_out (dynobj, &dyn,
|
||
(Elf_External_Dyn *) (newcontents + s->_raw_size));
|
||
|
||
s->_raw_size = newsize;
|
||
s->contents = newcontents;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Array used to determine the number of hash table buckets to use
|
||
based on the number of symbols there are. If there are fewer than
|
||
3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
|
||
fewer than 37 we use 17 buckets, and so forth. We never use more
|
||
than 32771 buckets. */
|
||
|
||
static const size_t elf_buckets[] =
|
||
{
|
||
1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
|
||
16411, 32771, 0
|
||
};
|
||
|
||
/* Compute bucket count for hashing table. We do not use a static set
|
||
of possible tables sizes anymore. Instead we determine for all
|
||
possible reasonable sizes of the table the outcome (i.e., the
|
||
number of collisions etc) and choose the best solution. The
|
||
weighting functions are not too simple to allow the table to grow
|
||
without bounds. Instead one of the weighting factors is the size.
|
||
Therefore the result is always a good payoff between few collisions
|
||
(= short chain lengths) and table size. */
|
||
static size_t
|
||
compute_bucket_count (struct bfd_link_info *info)
|
||
{
|
||
size_t dynsymcount = elf_hash_table (info)->dynsymcount;
|
||
size_t best_size = 0;
|
||
unsigned long int *hashcodes;
|
||
unsigned long int *hashcodesp;
|
||
unsigned long int i;
|
||
bfd_size_type amt;
|
||
|
||
/* Compute the hash values for all exported symbols. At the same
|
||
time store the values in an array so that we could use them for
|
||
optimizations. */
|
||
amt = dynsymcount;
|
||
amt *= sizeof (unsigned long int);
|
||
hashcodes = bfd_malloc (amt);
|
||
if (hashcodes == NULL)
|
||
return 0;
|
||
hashcodesp = hashcodes;
|
||
|
||
/* Put all hash values in HASHCODES. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_collect_hash_codes, &hashcodesp);
|
||
|
||
/* We have a problem here. The following code to optimize the table
|
||
size requires an integer type with more the 32 bits. If
|
||
BFD_HOST_U_64_BIT is set we know about such a type. */
|
||
#ifdef BFD_HOST_U_64_BIT
|
||
if (info->optimize)
|
||
{
|
||
unsigned long int nsyms = hashcodesp - hashcodes;
|
||
size_t minsize;
|
||
size_t maxsize;
|
||
BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
|
||
unsigned long int *counts ;
|
||
|
||
/* Possible optimization parameters: if we have NSYMS symbols we say
|
||
that the hashing table must at least have NSYMS/4 and at most
|
||
2*NSYMS buckets. */
|
||
minsize = nsyms / 4;
|
||
if (minsize == 0)
|
||
minsize = 1;
|
||
best_size = maxsize = nsyms * 2;
|
||
|
||
/* Create array where we count the collisions in. We must use bfd_malloc
|
||
since the size could be large. */
|
||
amt = maxsize;
|
||
amt *= sizeof (unsigned long int);
|
||
counts = bfd_malloc (amt);
|
||
if (counts == NULL)
|
||
{
|
||
free (hashcodes);
|
||
return 0;
|
||
}
|
||
|
||
/* Compute the "optimal" size for the hash table. The criteria is a
|
||
minimal chain length. The minor criteria is (of course) the size
|
||
of the table. */
|
||
for (i = minsize; i < maxsize; ++i)
|
||
{
|
||
/* Walk through the array of hashcodes and count the collisions. */
|
||
BFD_HOST_U_64_BIT max;
|
||
unsigned long int j;
|
||
unsigned long int fact;
|
||
|
||
memset (counts, '\0', i * sizeof (unsigned long int));
|
||
|
||
/* Determine how often each hash bucket is used. */
|
||
for (j = 0; j < nsyms; ++j)
|
||
++counts[hashcodes[j] % i];
|
||
|
||
/* For the weight function we need some information about the
|
||
pagesize on the target. This is information need not be 100%
|
||
accurate. Since this information is not available (so far) we
|
||
define it here to a reasonable default value. If it is crucial
|
||
to have a better value some day simply define this value. */
|
||
# ifndef BFD_TARGET_PAGESIZE
|
||
# define BFD_TARGET_PAGESIZE (4096)
|
||
# endif
|
||
|
||
/* We in any case need 2 + NSYMS entries for the size values and
|
||
the chains. */
|
||
max = (2 + nsyms) * (ARCH_SIZE / 8);
|
||
|
||
# if 1
|
||
/* Variant 1: optimize for short chains. We add the squares
|
||
of all the chain lengths (which favous many small chain
|
||
over a few long chains). */
|
||
for (j = 0; j < i; ++j)
|
||
max += counts[j] * counts[j];
|
||
|
||
/* This adds penalties for the overall size of the table. */
|
||
fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
|
||
max *= fact * fact;
|
||
# else
|
||
/* Variant 2: Optimize a lot more for small table. Here we
|
||
also add squares of the size but we also add penalties for
|
||
empty slots (the +1 term). */
|
||
for (j = 0; j < i; ++j)
|
||
max += (1 + counts[j]) * (1 + counts[j]);
|
||
|
||
/* The overall size of the table is considered, but not as
|
||
strong as in variant 1, where it is squared. */
|
||
fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
|
||
max *= fact;
|
||
# endif
|
||
|
||
/* Compare with current best results. */
|
||
if (max < best_chlen)
|
||
{
|
||
best_chlen = max;
|
||
best_size = i;
|
||
}
|
||
}
|
||
|
||
free (counts);
|
||
}
|
||
else
|
||
#endif /* defined (BFD_HOST_U_64_BIT) */
|
||
{
|
||
/* This is the fallback solution if no 64bit type is available or if we
|
||
are not supposed to spend much time on optimizations. We select the
|
||
bucket count using a fixed set of numbers. */
|
||
for (i = 0; elf_buckets[i] != 0; i++)
|
||
{
|
||
best_size = elf_buckets[i];
|
||
if (dynsymcount < elf_buckets[i + 1])
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Free the arrays we needed. */
|
||
free (hashcodes);
|
||
|
||
return best_size;
|
||
}
|
||
|
||
/* Set up the sizes and contents of the ELF dynamic sections. This is
|
||
called by the ELF linker emulation before_allocation routine. We
|
||
must set the sizes of the sections before the linker sets the
|
||
addresses of the various sections. */
|
||
|
||
bfd_boolean
|
||
NAME(bfd_elf,size_dynamic_sections) (bfd *output_bfd,
|
||
const char *soname,
|
||
const char *rpath,
|
||
const char *filter_shlib,
|
||
const char * const *auxiliary_filters,
|
||
struct bfd_link_info *info,
|
||
asection **sinterpptr,
|
||
struct bfd_elf_version_tree *verdefs)
|
||
{
|
||
bfd_size_type soname_indx;
|
||
bfd *dynobj;
|
||
const struct elf_backend_data *bed;
|
||
struct elf_assign_sym_version_info asvinfo;
|
||
|
||
*sinterpptr = NULL;
|
||
|
||
soname_indx = (bfd_size_type) -1;
|
||
|
||
if (info->hash->creator->flavour != bfd_target_elf_flavour)
|
||
return TRUE;
|
||
|
||
if (! is_elf_hash_table (info))
|
||
return TRUE;
|
||
|
||
if (info->execstack)
|
||
elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
|
||
else if (info->noexecstack)
|
||
elf_tdata (output_bfd)->stack_flags = PF_R | PF_W;
|
||
else
|
||
{
|
||
bfd *inputobj;
|
||
asection *notesec = NULL;
|
||
int exec = 0;
|
||
|
||
for (inputobj = info->input_bfds;
|
||
inputobj;
|
||
inputobj = inputobj->link_next)
|
||
{
|
||
asection *s;
|
||
|
||
if (inputobj->flags & DYNAMIC)
|
||
continue;
|
||
s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
|
||
if (s)
|
||
{
|
||
if (s->flags & SEC_CODE)
|
||
exec = PF_X;
|
||
notesec = s;
|
||
}
|
||
else
|
||
exec = PF_X;
|
||
}
|
||
if (notesec)
|
||
{
|
||
elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec;
|
||
if (exec && info->relocatable
|
||
&& notesec->output_section != bfd_abs_section_ptr)
|
||
notesec->output_section->flags |= SEC_CODE;
|
||
}
|
||
}
|
||
|
||
/* Any syms created from now on start with -1 in
|
||
got.refcount/offset and plt.refcount/offset. */
|
||
elf_hash_table (info)->init_refcount = elf_hash_table (info)->init_offset;
|
||
|
||
/* The backend may have to create some sections regardless of whether
|
||
we're dynamic or not. */
|
||
bed = get_elf_backend_data (output_bfd);
|
||
if (bed->elf_backend_always_size_sections
|
||
&& ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
|
||
return FALSE;
|
||
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
|
||
/* If there were no dynamic objects in the link, there is nothing to
|
||
do here. */
|
||
if (dynobj == NULL)
|
||
return TRUE;
|
||
|
||
if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
|
||
return FALSE;
|
||
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
struct elf_info_failed eif;
|
||
struct elf_link_hash_entry *h;
|
||
asection *dynstr;
|
||
struct bfd_elf_version_tree *t;
|
||
struct bfd_elf_version_expr *d;
|
||
bfd_boolean all_defined;
|
||
|
||
*sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
|
||
BFD_ASSERT (*sinterpptr != NULL || info->shared);
|
||
|
||
if (soname != NULL)
|
||
{
|
||
soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
soname, TRUE);
|
||
if (soname_indx == (bfd_size_type) -1
|
||
|| ! elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
|
||
return FALSE;
|
||
}
|
||
|
||
if (info->symbolic)
|
||
{
|
||
if (! elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
|
||
return FALSE;
|
||
info->flags |= DF_SYMBOLIC;
|
||
}
|
||
|
||
if (rpath != NULL)
|
||
{
|
||
bfd_size_type indx;
|
||
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
|
||
TRUE);
|
||
if (info->new_dtags)
|
||
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
|
||
if (indx == (bfd_size_type) -1
|
||
|| ! elf_add_dynamic_entry (info, DT_RPATH, indx)
|
||
|| (info->new_dtags
|
||
&& ! elf_add_dynamic_entry (info, DT_RUNPATH, indx)))
|
||
return FALSE;
|
||
}
|
||
|
||
if (filter_shlib != NULL)
|
||
{
|
||
bfd_size_type indx;
|
||
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
filter_shlib, TRUE);
|
||
if (indx == (bfd_size_type) -1
|
||
|| ! elf_add_dynamic_entry (info, DT_FILTER, indx))
|
||
return FALSE;
|
||
}
|
||
|
||
if (auxiliary_filters != NULL)
|
||
{
|
||
const char * const *p;
|
||
|
||
for (p = auxiliary_filters; *p != NULL; p++)
|
||
{
|
||
bfd_size_type indx;
|
||
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
*p, TRUE);
|
||
if (indx == (bfd_size_type) -1
|
||
|| ! elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
eif.info = info;
|
||
eif.verdefs = verdefs;
|
||
eif.failed = FALSE;
|
||
|
||
/* If we are supposed to export all symbols into the dynamic symbol
|
||
table (this is not the normal case), then do so. */
|
||
if (info->export_dynamic)
|
||
{
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
_bfd_elf_export_symbol,
|
||
&eif);
|
||
if (eif.failed)
|
||
return FALSE;
|
||
}
|
||
|
||
/* Make all global versions with definiton. */
|
||
for (t = verdefs; t != NULL; t = t->next)
|
||
for (d = t->globals; d != NULL; d = d->next)
|
||
if (!d->symver && strchr (d->pattern, '*') == NULL)
|
||
{
|
||
const char *verstr, *name;
|
||
size_t namelen, verlen, newlen;
|
||
char *newname, *p;
|
||
struct elf_link_hash_entry *newh;
|
||
|
||
name = d->pattern;
|
||
namelen = strlen (name);
|
||
verstr = t->name;
|
||
verlen = strlen (verstr);
|
||
newlen = namelen + verlen + 3;
|
||
|
||
newname = bfd_malloc (newlen);
|
||
if (newname == NULL)
|
||
return FALSE;
|
||
memcpy (newname, name, namelen);
|
||
|
||
/* Check the hidden versioned definition. */
|
||
p = newname + namelen;
|
||
*p++ = ELF_VER_CHR;
|
||
memcpy (p, verstr, verlen + 1);
|
||
newh = elf_link_hash_lookup (elf_hash_table (info),
|
||
newname, FALSE, FALSE,
|
||
FALSE);
|
||
if (newh == NULL
|
||
|| (newh->root.type != bfd_link_hash_defined
|
||
&& newh->root.type != bfd_link_hash_defweak))
|
||
{
|
||
/* Check the default versioned definition. */
|
||
*p++ = ELF_VER_CHR;
|
||
memcpy (p, verstr, verlen + 1);
|
||
newh = elf_link_hash_lookup (elf_hash_table (info),
|
||
newname, FALSE, FALSE,
|
||
FALSE);
|
||
}
|
||
free (newname);
|
||
|
||
/* Mark this version if there is a definition and it is
|
||
not defined in a shared object. */
|
||
if (newh != NULL
|
||
&& ((newh->elf_link_hash_flags
|
||
& ELF_LINK_HASH_DEF_DYNAMIC) == 0)
|
||
&& (newh->root.type == bfd_link_hash_defined
|
||
|| newh->root.type == bfd_link_hash_defweak))
|
||
d->symver = 1;
|
||
}
|
||
|
||
/* Attach all the symbols to their version information. */
|
||
asvinfo.output_bfd = output_bfd;
|
||
asvinfo.info = info;
|
||
asvinfo.verdefs = verdefs;
|
||
asvinfo.failed = FALSE;
|
||
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
_bfd_elf_link_assign_sym_version,
|
||
&asvinfo);
|
||
if (asvinfo.failed)
|
||
return FALSE;
|
||
|
||
if (!info->allow_undefined_version)
|
||
{
|
||
/* Check if all global versions have a definiton. */
|
||
all_defined = TRUE;
|
||
for (t = verdefs; t != NULL; t = t->next)
|
||
for (d = t->globals; d != NULL; d = d->next)
|
||
if (!d->symver && !d->script
|
||
&& strchr (d->pattern, '*') == NULL)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: undefined version: %s"),
|
||
d->pattern, t->name);
|
||
all_defined = FALSE;
|
||
}
|
||
|
||
if (!all_defined)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* Find all symbols which were defined in a dynamic object and make
|
||
the backend pick a reasonable value for them. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
_bfd_elf_adjust_dynamic_symbol,
|
||
&eif);
|
||
if (eif.failed)
|
||
return FALSE;
|
||
|
||
/* Add some entries to the .dynamic section. We fill in some of the
|
||
values later, in elf_bfd_final_link, but we must add the entries
|
||
now so that we know the final size of the .dynamic section. */
|
||
|
||
/* If there are initialization and/or finalization functions to
|
||
call then add the corresponding DT_INIT/DT_FINI entries. */
|
||
h = (info->init_function
|
||
? elf_link_hash_lookup (elf_hash_table (info),
|
||
info->init_function, FALSE,
|
||
FALSE, FALSE)
|
||
: NULL);
|
||
if (h != NULL
|
||
&& (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
|
||
| ELF_LINK_HASH_DEF_REGULAR)) != 0)
|
||
{
|
||
if (! elf_add_dynamic_entry (info, DT_INIT, 0))
|
||
return FALSE;
|
||
}
|
||
h = (info->fini_function
|
||
? elf_link_hash_lookup (elf_hash_table (info),
|
||
info->fini_function, FALSE,
|
||
FALSE, FALSE)
|
||
: NULL);
|
||
if (h != NULL
|
||
&& (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
|
||
| ELF_LINK_HASH_DEF_REGULAR)) != 0)
|
||
{
|
||
if (! elf_add_dynamic_entry (info, DT_FINI, 0))
|
||
return FALSE;
|
||
}
|
||
|
||
if (bfd_get_section_by_name (output_bfd, ".preinit_array") != NULL)
|
||
{
|
||
/* DT_PREINIT_ARRAY is not allowed in shared library. */
|
||
if (! info->executable)
|
||
{
|
||
bfd *sub;
|
||
asection *o;
|
||
|
||
for (sub = info->input_bfds; sub != NULL;
|
||
sub = sub->link_next)
|
||
for (o = sub->sections; o != NULL; o = o->next)
|
||
if (elf_section_data (o)->this_hdr.sh_type
|
||
== SHT_PREINIT_ARRAY)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: .preinit_array section is not allowed in DSO"),
|
||
bfd_archive_filename (sub));
|
||
break;
|
||
}
|
||
|
||
bfd_set_error (bfd_error_nonrepresentable_section);
|
||
return FALSE;
|
||
}
|
||
|
||
if (!elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
|
||
|| !elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
|
||
return FALSE;
|
||
}
|
||
if (bfd_get_section_by_name (output_bfd, ".init_array") != NULL)
|
||
{
|
||
if (!elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
|
||
|| !elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
|
||
return FALSE;
|
||
}
|
||
if (bfd_get_section_by_name (output_bfd, ".fini_array") != NULL)
|
||
{
|
||
if (!elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
|
||
|| !elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
|
||
return FALSE;
|
||
}
|
||
|
||
dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
|
||
/* If .dynstr is excluded from the link, we don't want any of
|
||
these tags. Strictly, we should be checking each section
|
||
individually; This quick check covers for the case where
|
||
someone does a /DISCARD/ : { *(*) }. */
|
||
if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
|
||
{
|
||
bfd_size_type strsize;
|
||
|
||
strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
|
||
if (! elf_add_dynamic_entry (info, DT_HASH, 0)
|
||
|| ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
|
||
|| ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
|
||
|| ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
|
||
|| ! elf_add_dynamic_entry (info, DT_SYMENT,
|
||
sizeof (Elf_External_Sym)))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* The backend must work out the sizes of all the other dynamic
|
||
sections. */
|
||
if (bed->elf_backend_size_dynamic_sections
|
||
&& ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
|
||
return FALSE;
|
||
|
||
if (elf_hash_table (info)->dynamic_sections_created)
|
||
{
|
||
bfd_size_type dynsymcount;
|
||
asection *s;
|
||
size_t bucketcount = 0;
|
||
size_t hash_entry_size;
|
||
unsigned int dtagcount;
|
||
|
||
/* Set up the version definition section. */
|
||
s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
/* We may have created additional version definitions if we are
|
||
just linking a regular application. */
|
||
verdefs = asvinfo.verdefs;
|
||
|
||
/* Skip anonymous version tag. */
|
||
if (verdefs != NULL && verdefs->vernum == 0)
|
||
verdefs = verdefs->next;
|
||
|
||
if (verdefs == NULL)
|
||
_bfd_strip_section_from_output (info, s);
|
||
else
|
||
{
|
||
unsigned int cdefs;
|
||
bfd_size_type size;
|
||
struct bfd_elf_version_tree *t;
|
||
bfd_byte *p;
|
||
Elf_Internal_Verdef def;
|
||
Elf_Internal_Verdaux defaux;
|
||
|
||
cdefs = 0;
|
||
size = 0;
|
||
|
||
/* Make space for the base version. */
|
||
size += sizeof (Elf_External_Verdef);
|
||
size += sizeof (Elf_External_Verdaux);
|
||
++cdefs;
|
||
|
||
for (t = verdefs; t != NULL; t = t->next)
|
||
{
|
||
struct bfd_elf_version_deps *n;
|
||
|
||
size += sizeof (Elf_External_Verdef);
|
||
size += sizeof (Elf_External_Verdaux);
|
||
++cdefs;
|
||
|
||
for (n = t->deps; n != NULL; n = n->next)
|
||
size += sizeof (Elf_External_Verdaux);
|
||
}
|
||
|
||
s->_raw_size = size;
|
||
s->contents = bfd_alloc (output_bfd, s->_raw_size);
|
||
if (s->contents == NULL && s->_raw_size != 0)
|
||
return FALSE;
|
||
|
||
/* Fill in the version definition section. */
|
||
|
||
p = s->contents;
|
||
|
||
def.vd_version = VER_DEF_CURRENT;
|
||
def.vd_flags = VER_FLG_BASE;
|
||
def.vd_ndx = 1;
|
||
def.vd_cnt = 1;
|
||
def.vd_aux = sizeof (Elf_External_Verdef);
|
||
def.vd_next = (sizeof (Elf_External_Verdef)
|
||
+ sizeof (Elf_External_Verdaux));
|
||
|
||
if (soname_indx != (bfd_size_type) -1)
|
||
{
|
||
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
|
||
soname_indx);
|
||
def.vd_hash = bfd_elf_hash (soname);
|
||
defaux.vda_name = soname_indx;
|
||
}
|
||
else
|
||
{
|
||
const char *name;
|
||
bfd_size_type indx;
|
||
|
||
name = basename (output_bfd->filename);
|
||
def.vd_hash = bfd_elf_hash (name);
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
name, FALSE);
|
||
if (indx == (bfd_size_type) -1)
|
||
return FALSE;
|
||
defaux.vda_name = indx;
|
||
}
|
||
defaux.vda_next = 0;
|
||
|
||
_bfd_elf_swap_verdef_out (output_bfd, &def,
|
||
(Elf_External_Verdef *) p);
|
||
p += sizeof (Elf_External_Verdef);
|
||
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
|
||
(Elf_External_Verdaux *) p);
|
||
p += sizeof (Elf_External_Verdaux);
|
||
|
||
for (t = verdefs; t != NULL; t = t->next)
|
||
{
|
||
unsigned int cdeps;
|
||
struct bfd_elf_version_deps *n;
|
||
struct elf_link_hash_entry *h;
|
||
struct bfd_link_hash_entry *bh;
|
||
|
||
cdeps = 0;
|
||
for (n = t->deps; n != NULL; n = n->next)
|
||
++cdeps;
|
||
|
||
/* Add a symbol representing this version. */
|
||
bh = NULL;
|
||
if (! (_bfd_generic_link_add_one_symbol
|
||
(info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
|
||
0, NULL, FALSE,
|
||
get_elf_backend_data (dynobj)->collect, &bh)))
|
||
return FALSE;
|
||
h = (struct elf_link_hash_entry *) bh;
|
||
h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
|
||
h->type = STT_OBJECT;
|
||
h->verinfo.vertree = t;
|
||
|
||
if (! _bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return FALSE;
|
||
|
||
def.vd_version = VER_DEF_CURRENT;
|
||
def.vd_flags = 0;
|
||
if (t->globals == NULL && t->locals == NULL && ! t->used)
|
||
def.vd_flags |= VER_FLG_WEAK;
|
||
def.vd_ndx = t->vernum + 1;
|
||
def.vd_cnt = cdeps + 1;
|
||
def.vd_hash = bfd_elf_hash (t->name);
|
||
def.vd_aux = sizeof (Elf_External_Verdef);
|
||
if (t->next != NULL)
|
||
def.vd_next = (sizeof (Elf_External_Verdef)
|
||
+ (cdeps + 1) * sizeof (Elf_External_Verdaux));
|
||
else
|
||
def.vd_next = 0;
|
||
|
||
_bfd_elf_swap_verdef_out (output_bfd, &def,
|
||
(Elf_External_Verdef *) p);
|
||
p += sizeof (Elf_External_Verdef);
|
||
|
||
defaux.vda_name = h->dynstr_index;
|
||
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
|
||
h->dynstr_index);
|
||
if (t->deps == NULL)
|
||
defaux.vda_next = 0;
|
||
else
|
||
defaux.vda_next = sizeof (Elf_External_Verdaux);
|
||
t->name_indx = defaux.vda_name;
|
||
|
||
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
|
||
(Elf_External_Verdaux *) p);
|
||
p += sizeof (Elf_External_Verdaux);
|
||
|
||
for (n = t->deps; n != NULL; n = n->next)
|
||
{
|
||
if (n->version_needed == NULL)
|
||
{
|
||
/* This can happen if there was an error in the
|
||
version script. */
|
||
defaux.vda_name = 0;
|
||
}
|
||
else
|
||
{
|
||
defaux.vda_name = n->version_needed->name_indx;
|
||
_bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
|
||
defaux.vda_name);
|
||
}
|
||
if (n->next == NULL)
|
||
defaux.vda_next = 0;
|
||
else
|
||
defaux.vda_next = sizeof (Elf_External_Verdaux);
|
||
|
||
_bfd_elf_swap_verdaux_out (output_bfd, &defaux,
|
||
(Elf_External_Verdaux *) p);
|
||
p += sizeof (Elf_External_Verdaux);
|
||
}
|
||
}
|
||
|
||
if (! elf_add_dynamic_entry (info, DT_VERDEF, 0)
|
||
|| ! elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
|
||
return FALSE;
|
||
|
||
elf_tdata (output_bfd)->cverdefs = cdefs;
|
||
}
|
||
|
||
if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
|
||
{
|
||
if (! elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
|
||
return FALSE;
|
||
}
|
||
|
||
if (info->flags_1)
|
||
{
|
||
if (info->executable)
|
||
info->flags_1 &= ~ (DF_1_INITFIRST
|
||
| DF_1_NODELETE
|
||
| DF_1_NOOPEN);
|
||
if (! elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
|
||
return FALSE;
|
||
}
|
||
|
||
/* Work out the size of the version reference section. */
|
||
|
||
s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
|
||
BFD_ASSERT (s != NULL);
|
||
{
|
||
struct elf_find_verdep_info sinfo;
|
||
|
||
sinfo.output_bfd = output_bfd;
|
||
sinfo.info = info;
|
||
sinfo.vers = elf_tdata (output_bfd)->cverdefs;
|
||
if (sinfo.vers == 0)
|
||
sinfo.vers = 1;
|
||
sinfo.failed = FALSE;
|
||
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
_bfd_elf_link_find_version_dependencies,
|
||
&sinfo);
|
||
|
||
if (elf_tdata (output_bfd)->verref == NULL)
|
||
_bfd_strip_section_from_output (info, s);
|
||
else
|
||
{
|
||
Elf_Internal_Verneed *t;
|
||
unsigned int size;
|
||
unsigned int crefs;
|
||
bfd_byte *p;
|
||
|
||
/* Build the version definition section. */
|
||
size = 0;
|
||
crefs = 0;
|
||
for (t = elf_tdata (output_bfd)->verref;
|
||
t != NULL;
|
||
t = t->vn_nextref)
|
||
{
|
||
Elf_Internal_Vernaux *a;
|
||
|
||
size += sizeof (Elf_External_Verneed);
|
||
++crefs;
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
size += sizeof (Elf_External_Vernaux);
|
||
}
|
||
|
||
s->_raw_size = size;
|
||
s->contents = bfd_alloc (output_bfd, s->_raw_size);
|
||
if (s->contents == NULL)
|
||
return FALSE;
|
||
|
||
p = s->contents;
|
||
for (t = elf_tdata (output_bfd)->verref;
|
||
t != NULL;
|
||
t = t->vn_nextref)
|
||
{
|
||
unsigned int caux;
|
||
Elf_Internal_Vernaux *a;
|
||
bfd_size_type indx;
|
||
|
||
caux = 0;
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
++caux;
|
||
|
||
t->vn_version = VER_NEED_CURRENT;
|
||
t->vn_cnt = caux;
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
elf_dt_name (t->vn_bfd) != NULL
|
||
? elf_dt_name (t->vn_bfd)
|
||
: basename (t->vn_bfd->filename),
|
||
FALSE);
|
||
if (indx == (bfd_size_type) -1)
|
||
return FALSE;
|
||
t->vn_file = indx;
|
||
t->vn_aux = sizeof (Elf_External_Verneed);
|
||
if (t->vn_nextref == NULL)
|
||
t->vn_next = 0;
|
||
else
|
||
t->vn_next = (sizeof (Elf_External_Verneed)
|
||
+ caux * sizeof (Elf_External_Vernaux));
|
||
|
||
_bfd_elf_swap_verneed_out (output_bfd, t,
|
||
(Elf_External_Verneed *) p);
|
||
p += sizeof (Elf_External_Verneed);
|
||
|
||
for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
|
||
{
|
||
a->vna_hash = bfd_elf_hash (a->vna_nodename);
|
||
indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
|
||
a->vna_nodename, FALSE);
|
||
if (indx == (bfd_size_type) -1)
|
||
return FALSE;
|
||
a->vna_name = indx;
|
||
if (a->vna_nextptr == NULL)
|
||
a->vna_next = 0;
|
||
else
|
||
a->vna_next = sizeof (Elf_External_Vernaux);
|
||
|
||
_bfd_elf_swap_vernaux_out (output_bfd, a,
|
||
(Elf_External_Vernaux *) p);
|
||
p += sizeof (Elf_External_Vernaux);
|
||
}
|
||
}
|
||
|
||
if (! elf_add_dynamic_entry (info, DT_VERNEED, 0)
|
||
|| ! elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
|
||
return FALSE;
|
||
|
||
elf_tdata (output_bfd)->cverrefs = crefs;
|
||
}
|
||
}
|
||
|
||
/* Assign dynsym indicies. In a shared library we generate a
|
||
section symbol for each output section, which come first.
|
||
Next come all of the back-end allocated local dynamic syms,
|
||
followed by the rest of the global symbols. */
|
||
|
||
dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
|
||
|
||
/* Work out the size of the symbol version section. */
|
||
s = bfd_get_section_by_name (dynobj, ".gnu.version");
|
||
BFD_ASSERT (s != NULL);
|
||
if (dynsymcount == 0
|
||
|| (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
|
||
{
|
||
_bfd_strip_section_from_output (info, s);
|
||
/* The DYNSYMCOUNT might have changed if we were going to
|
||
output a dynamic symbol table entry for S. */
|
||
dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
|
||
}
|
||
else
|
||
{
|
||
s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
|
||
s->contents = bfd_zalloc (output_bfd, s->_raw_size);
|
||
if (s->contents == NULL)
|
||
return FALSE;
|
||
|
||
if (! elf_add_dynamic_entry (info, DT_VERSYM, 0))
|
||
return FALSE;
|
||
}
|
||
|
||
/* Set the size of the .dynsym and .hash sections. We counted
|
||
the number of dynamic symbols in elf_link_add_object_symbols.
|
||
We will build the contents of .dynsym and .hash when we build
|
||
the final symbol table, because until then we do not know the
|
||
correct value to give the symbols. We built the .dynstr
|
||
section as we went along in elf_link_add_object_symbols. */
|
||
s = bfd_get_section_by_name (dynobj, ".dynsym");
|
||
BFD_ASSERT (s != NULL);
|
||
s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
|
||
s->contents = bfd_alloc (output_bfd, s->_raw_size);
|
||
if (s->contents == NULL && s->_raw_size != 0)
|
||
return FALSE;
|
||
|
||
if (dynsymcount != 0)
|
||
{
|
||
Elf_Internal_Sym isym;
|
||
|
||
/* The first entry in .dynsym is a dummy symbol. */
|
||
isym.st_value = 0;
|
||
isym.st_size = 0;
|
||
isym.st_name = 0;
|
||
isym.st_info = 0;
|
||
isym.st_other = 0;
|
||
isym.st_shndx = 0;
|
||
elf_swap_symbol_out (output_bfd, &isym, s->contents, 0);
|
||
}
|
||
|
||
/* Compute the size of the hashing table. As a side effect this
|
||
computes the hash values for all the names we export. */
|
||
bucketcount = compute_bucket_count (info);
|
||
|
||
s = bfd_get_section_by_name (dynobj, ".hash");
|
||
BFD_ASSERT (s != NULL);
|
||
hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
|
||
s->_raw_size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
|
||
s->contents = bfd_zalloc (output_bfd, s->_raw_size);
|
||
if (s->contents == NULL)
|
||
return FALSE;
|
||
|
||
bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
|
||
bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
|
||
s->contents + hash_entry_size);
|
||
|
||
elf_hash_table (info)->bucketcount = bucketcount;
|
||
|
||
s = bfd_get_section_by_name (dynobj, ".dynstr");
|
||
BFD_ASSERT (s != NULL);
|
||
|
||
elf_finalize_dynstr (output_bfd, info);
|
||
|
||
s->_raw_size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
|
||
|
||
for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
|
||
if (! elf_add_dynamic_entry (info, DT_NULL, 0))
|
||
return FALSE;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* This function is used to adjust offsets into .dynstr for
|
||
dynamic symbols. This is called via elf_link_hash_traverse. */
|
||
|
||
static bfd_boolean
|
||
elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct elf_strtab_hash *dynstr = data;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
if (h->dynindx != -1)
|
||
h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
|
||
return TRUE;
|
||
}
|
||
|
||
/* Assign string offsets in .dynstr, update all structures referencing
|
||
them. */
|
||
|
||
static bfd_boolean
|
||
elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
|
||
{
|
||
struct elf_link_local_dynamic_entry *entry;
|
||
struct elf_strtab_hash *dynstr = elf_hash_table (info)->dynstr;
|
||
bfd *dynobj = elf_hash_table (info)->dynobj;
|
||
asection *sdyn;
|
||
bfd_size_type size;
|
||
Elf_External_Dyn *dyncon, *dynconend;
|
||
|
||
_bfd_elf_strtab_finalize (dynstr);
|
||
size = _bfd_elf_strtab_size (dynstr);
|
||
|
||
/* Update all .dynamic entries referencing .dynstr strings. */
|
||
sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
|
||
BFD_ASSERT (sdyn != NULL);
|
||
|
||
dyncon = (Elf_External_Dyn *) sdyn->contents;
|
||
dynconend = (Elf_External_Dyn *) (sdyn->contents +
|
||
sdyn->_raw_size);
|
||
for (; dyncon < dynconend; dyncon++)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
|
||
elf_swap_dyn_in (dynobj, dyncon, & dyn);
|
||
switch (dyn.d_tag)
|
||
{
|
||
case DT_STRSZ:
|
||
dyn.d_un.d_val = size;
|
||
elf_swap_dyn_out (dynobj, & dyn, dyncon);
|
||
break;
|
||
case DT_NEEDED:
|
||
case DT_SONAME:
|
||
case DT_RPATH:
|
||
case DT_RUNPATH:
|
||
case DT_FILTER:
|
||
case DT_AUXILIARY:
|
||
dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
|
||
elf_swap_dyn_out (dynobj, & dyn, dyncon);
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Now update local dynamic symbols. */
|
||
for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
|
||
entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
|
||
entry->isym.st_name);
|
||
|
||
/* And the rest of dynamic symbols. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_adjust_dynstr_offsets, dynstr);
|
||
|
||
/* Adjust version definitions. */
|
||
if (elf_tdata (output_bfd)->cverdefs)
|
||
{
|
||
asection *s;
|
||
bfd_byte *p;
|
||
bfd_size_type i;
|
||
Elf_Internal_Verdef def;
|
||
Elf_Internal_Verdaux defaux;
|
||
|
||
s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
|
||
p = (bfd_byte *) s->contents;
|
||
do
|
||
{
|
||
_bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
|
||
&def);
|
||
p += sizeof (Elf_External_Verdef);
|
||
for (i = 0; i < def.vd_cnt; ++i)
|
||
{
|
||
_bfd_elf_swap_verdaux_in (output_bfd,
|
||
(Elf_External_Verdaux *) p, &defaux);
|
||
defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
|
||
defaux.vda_name);
|
||
_bfd_elf_swap_verdaux_out (output_bfd,
|
||
&defaux, (Elf_External_Verdaux *) p);
|
||
p += sizeof (Elf_External_Verdaux);
|
||
}
|
||
}
|
||
while (def.vd_next);
|
||
}
|
||
|
||
/* Adjust version references. */
|
||
if (elf_tdata (output_bfd)->verref)
|
||
{
|
||
asection *s;
|
||
bfd_byte *p;
|
||
bfd_size_type i;
|
||
Elf_Internal_Verneed need;
|
||
Elf_Internal_Vernaux needaux;
|
||
|
||
s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
|
||
p = (bfd_byte *) s->contents;
|
||
do
|
||
{
|
||
_bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
|
||
&need);
|
||
need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
|
||
_bfd_elf_swap_verneed_out (output_bfd, &need,
|
||
(Elf_External_Verneed *) p);
|
||
p += sizeof (Elf_External_Verneed);
|
||
for (i = 0; i < need.vn_cnt; ++i)
|
||
{
|
||
_bfd_elf_swap_vernaux_in (output_bfd,
|
||
(Elf_External_Vernaux *) p, &needaux);
|
||
needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
|
||
needaux.vna_name);
|
||
_bfd_elf_swap_vernaux_out (output_bfd,
|
||
&needaux,
|
||
(Elf_External_Vernaux *) p);
|
||
p += sizeof (Elf_External_Vernaux);
|
||
}
|
||
}
|
||
while (need.vn_next);
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Final phase of ELF linker. */
|
||
|
||
/* A structure we use to avoid passing large numbers of arguments. */
|
||
|
||
struct elf_final_link_info
|
||
{
|
||
/* General link information. */
|
||
struct bfd_link_info *info;
|
||
/* Output BFD. */
|
||
bfd *output_bfd;
|
||
/* Symbol string table. */
|
||
struct bfd_strtab_hash *symstrtab;
|
||
/* .dynsym section. */
|
||
asection *dynsym_sec;
|
||
/* .hash section. */
|
||
asection *hash_sec;
|
||
/* symbol version section (.gnu.version). */
|
||
asection *symver_sec;
|
||
/* first SHF_TLS section (if any). */
|
||
asection *first_tls_sec;
|
||
/* Buffer large enough to hold contents of any section. */
|
||
bfd_byte *contents;
|
||
/* Buffer large enough to hold external relocs of any section. */
|
||
void *external_relocs;
|
||
/* Buffer large enough to hold internal relocs of any section. */
|
||
Elf_Internal_Rela *internal_relocs;
|
||
/* Buffer large enough to hold external local symbols of any input
|
||
BFD. */
|
||
Elf_External_Sym *external_syms;
|
||
/* And a buffer for symbol section indices. */
|
||
Elf_External_Sym_Shndx *locsym_shndx;
|
||
/* Buffer large enough to hold internal local symbols of any input
|
||
BFD. */
|
||
Elf_Internal_Sym *internal_syms;
|
||
/* Array large enough to hold a symbol index for each local symbol
|
||
of any input BFD. */
|
||
long *indices;
|
||
/* Array large enough to hold a section pointer for each local
|
||
symbol of any input BFD. */
|
||
asection **sections;
|
||
/* Buffer to hold swapped out symbols. */
|
||
Elf_External_Sym *symbuf;
|
||
/* And one for symbol section indices. */
|
||
Elf_External_Sym_Shndx *symshndxbuf;
|
||
/* Number of swapped out symbols in buffer. */
|
||
size_t symbuf_count;
|
||
/* Number of symbols which fit in symbuf. */
|
||
size_t symbuf_size;
|
||
/* And same for symshndxbuf. */
|
||
size_t shndxbuf_size;
|
||
};
|
||
|
||
static bfd_boolean elf_link_output_sym
|
||
(struct elf_final_link_info *, const char *, Elf_Internal_Sym *, asection *);
|
||
static bfd_boolean elf_link_flush_output_syms
|
||
(struct elf_final_link_info *);
|
||
static bfd_boolean elf_link_output_extsym
|
||
(struct elf_link_hash_entry *, void *);
|
||
static bfd_boolean elf_link_input_bfd
|
||
(struct elf_final_link_info *, bfd *);
|
||
static bfd_boolean elf_reloc_link_order
|
||
(bfd *, struct bfd_link_info *, asection *, struct bfd_link_order *);
|
||
|
||
/* This struct is used to pass information to elf_link_output_extsym. */
|
||
|
||
struct elf_outext_info
|
||
{
|
||
bfd_boolean failed;
|
||
bfd_boolean localsyms;
|
||
struct elf_final_link_info *finfo;
|
||
};
|
||
|
||
/* When performing a relocatable link, the input relocations are
|
||
preserved. But, if they reference global symbols, the indices
|
||
referenced must be updated. Update all the relocations in
|
||
REL_HDR (there are COUNT of them), using the data in REL_HASH. */
|
||
|
||
static void
|
||
elf_link_adjust_relocs (bfd *abfd,
|
||
Elf_Internal_Shdr *rel_hdr,
|
||
unsigned int count,
|
||
struct elf_link_hash_entry **rel_hash)
|
||
{
|
||
unsigned int i;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
bfd_byte *erela;
|
||
void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
|
||
void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
|
||
|
||
if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
|
||
{
|
||
swap_in = bed->s->swap_reloc_in;
|
||
swap_out = bed->s->swap_reloc_out;
|
||
}
|
||
else if (rel_hdr->sh_entsize == sizeof (Elf_External_Rela))
|
||
{
|
||
swap_in = bed->s->swap_reloca_in;
|
||
swap_out = bed->s->swap_reloca_out;
|
||
}
|
||
else
|
||
abort ();
|
||
|
||
if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
|
||
abort ();
|
||
|
||
erela = rel_hdr->contents;
|
||
for (i = 0; i < count; i++, rel_hash++, erela += rel_hdr->sh_entsize)
|
||
{
|
||
Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
|
||
unsigned int j;
|
||
|
||
if (*rel_hash == NULL)
|
||
continue;
|
||
|
||
BFD_ASSERT ((*rel_hash)->indx >= 0);
|
||
|
||
(*swap_in) (abfd, erela, irela);
|
||
for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
|
||
irela[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
|
||
ELF_R_TYPE (irela[j].r_info));
|
||
(*swap_out) (abfd, irela, erela);
|
||
}
|
||
}
|
||
|
||
struct elf_link_sort_rela
|
||
{
|
||
bfd_vma offset;
|
||
enum elf_reloc_type_class type;
|
||
/* We use this as an array of size int_rels_per_ext_rel. */
|
||
Elf_Internal_Rela rela[1];
|
||
};
|
||
|
||
static int
|
||
elf_link_sort_cmp1 (const void *A, const void *B)
|
||
{
|
||
const struct elf_link_sort_rela *a = A;
|
||
const struct elf_link_sort_rela *b = B;
|
||
int relativea, relativeb;
|
||
|
||
relativea = a->type == reloc_class_relative;
|
||
relativeb = b->type == reloc_class_relative;
|
||
|
||
if (relativea < relativeb)
|
||
return 1;
|
||
if (relativea > relativeb)
|
||
return -1;
|
||
if (ELF_R_SYM (a->rela->r_info) < ELF_R_SYM (b->rela->r_info))
|
||
return -1;
|
||
if (ELF_R_SYM (a->rela->r_info) > ELF_R_SYM (b->rela->r_info))
|
||
return 1;
|
||
if (a->rela->r_offset < b->rela->r_offset)
|
||
return -1;
|
||
if (a->rela->r_offset > b->rela->r_offset)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
elf_link_sort_cmp2 (const void *A, const void *B)
|
||
{
|
||
const struct elf_link_sort_rela *a = A;
|
||
const struct elf_link_sort_rela *b = B;
|
||
int copya, copyb;
|
||
|
||
if (a->offset < b->offset)
|
||
return -1;
|
||
if (a->offset > b->offset)
|
||
return 1;
|
||
copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
|
||
copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
|
||
if (copya < copyb)
|
||
return -1;
|
||
if (copya > copyb)
|
||
return 1;
|
||
if (a->rela->r_offset < b->rela->r_offset)
|
||
return -1;
|
||
if (a->rela->r_offset > b->rela->r_offset)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
static size_t
|
||
elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
|
||
{
|
||
asection *reldyn;
|
||
bfd_size_type count, size;
|
||
size_t i, ret, sort_elt, ext_size;
|
||
bfd_byte *sort, *s_non_relative, *p;
|
||
struct elf_link_sort_rela *sq;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
int i2e = bed->s->int_rels_per_ext_rel;
|
||
void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
|
||
void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
|
||
struct bfd_link_order *lo;
|
||
|
||
reldyn = bfd_get_section_by_name (abfd, ".rela.dyn");
|
||
if (reldyn == NULL || reldyn->_raw_size == 0)
|
||
{
|
||
reldyn = bfd_get_section_by_name (abfd, ".rel.dyn");
|
||
if (reldyn == NULL || reldyn->_raw_size == 0)
|
||
return 0;
|
||
ext_size = sizeof (Elf_External_Rel);
|
||
swap_in = bed->s->swap_reloc_in;
|
||
swap_out = bed->s->swap_reloc_out;
|
||
}
|
||
else
|
||
{
|
||
ext_size = sizeof (Elf_External_Rela);
|
||
swap_in = bed->s->swap_reloca_in;
|
||
swap_out = bed->s->swap_reloca_out;
|
||
}
|
||
count = reldyn->_raw_size / ext_size;
|
||
|
||
size = 0;
|
||
for (lo = reldyn->link_order_head; lo != NULL; lo = lo->next)
|
||
if (lo->type == bfd_indirect_link_order)
|
||
{
|
||
asection *o = lo->u.indirect.section;
|
||
size += o->_raw_size;
|
||
}
|
||
|
||
if (size != reldyn->_raw_size)
|
||
return 0;
|
||
|
||
sort_elt = (sizeof (struct elf_link_sort_rela)
|
||
+ (i2e - 1) * sizeof (Elf_Internal_Rela));
|
||
sort = bfd_zmalloc (sort_elt * count);
|
||
if (sort == NULL)
|
||
{
|
||
(*info->callbacks->warning)
|
||
(info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
|
||
return 0;
|
||
}
|
||
|
||
for (lo = reldyn->link_order_head; lo != NULL; lo = lo->next)
|
||
if (lo->type == bfd_indirect_link_order)
|
||
{
|
||
bfd_byte *erel, *erelend;
|
||
asection *o = lo->u.indirect.section;
|
||
|
||
erel = o->contents;
|
||
erelend = o->contents + o->_raw_size;
|
||
p = sort + o->output_offset / ext_size * sort_elt;
|
||
while (erel < erelend)
|
||
{
|
||
struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
|
||
(*swap_in) (abfd, erel, s->rela);
|
||
s->type = (*bed->elf_backend_reloc_type_class) (s->rela);
|
||
p += sort_elt;
|
||
erel += ext_size;
|
||
}
|
||
}
|
||
|
||
qsort (sort, count, sort_elt, elf_link_sort_cmp1);
|
||
|
||
for (i = 0, p = sort; i < count; i++, p += sort_elt)
|
||
{
|
||
struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
|
||
if (s->type != reloc_class_relative)
|
||
break;
|
||
}
|
||
ret = i;
|
||
s_non_relative = p;
|
||
|
||
sq = (struct elf_link_sort_rela *) s_non_relative;
|
||
for (; i < count; i++, p += sort_elt)
|
||
{
|
||
struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
|
||
if (ELF_R_SYM (sp->rela->r_info) != ELF_R_SYM (sq->rela->r_info))
|
||
sq = sp;
|
||
sp->offset = sq->rela->r_offset;
|
||
}
|
||
|
||
qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
|
||
|
||
for (lo = reldyn->link_order_head; lo != NULL; lo = lo->next)
|
||
if (lo->type == bfd_indirect_link_order)
|
||
{
|
||
bfd_byte *erel, *erelend;
|
||
asection *o = lo->u.indirect.section;
|
||
|
||
erel = o->contents;
|
||
erelend = o->contents + o->_raw_size;
|
||
p = sort + o->output_offset / ext_size * sort_elt;
|
||
while (erel < erelend)
|
||
{
|
||
struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
|
||
(*swap_out) (abfd, s->rela, erel);
|
||
p += sort_elt;
|
||
erel += ext_size;
|
||
}
|
||
}
|
||
|
||
free (sort);
|
||
*psec = reldyn;
|
||
return ret;
|
||
}
|
||
|
||
/* Do the final step of an ELF link. */
|
||
|
||
bfd_boolean
|
||
elf_bfd_final_link (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
bfd_boolean dynamic;
|
||
bfd_boolean emit_relocs;
|
||
bfd *dynobj;
|
||
struct elf_final_link_info finfo;
|
||
register asection *o;
|
||
register struct bfd_link_order *p;
|
||
register bfd *sub;
|
||
bfd_size_type max_contents_size;
|
||
bfd_size_type max_external_reloc_size;
|
||
bfd_size_type max_internal_reloc_count;
|
||
bfd_size_type max_sym_count;
|
||
bfd_size_type max_sym_shndx_count;
|
||
file_ptr off;
|
||
Elf_Internal_Sym elfsym;
|
||
unsigned int i;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
Elf_Internal_Shdr *symtab_shndx_hdr;
|
||
Elf_Internal_Shdr *symstrtab_hdr;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
struct elf_outext_info eoinfo;
|
||
bfd_boolean merged;
|
||
size_t relativecount = 0;
|
||
asection *reldyn = 0;
|
||
bfd_size_type amt;
|
||
|
||
if (! is_elf_hash_table (info))
|
||
return FALSE;
|
||
|
||
if (info->shared)
|
||
abfd->flags |= DYNAMIC;
|
||
|
||
dynamic = elf_hash_table (info)->dynamic_sections_created;
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
|
||
emit_relocs = (info->relocatable
|
||
|| info->emitrelocations
|
||
|| bed->elf_backend_emit_relocs);
|
||
|
||
finfo.info = info;
|
||
finfo.output_bfd = abfd;
|
||
finfo.symstrtab = elf_stringtab_init ();
|
||
if (finfo.symstrtab == NULL)
|
||
return FALSE;
|
||
|
||
if (! dynamic)
|
||
{
|
||
finfo.dynsym_sec = NULL;
|
||
finfo.hash_sec = NULL;
|
||
finfo.symver_sec = NULL;
|
||
}
|
||
else
|
||
{
|
||
finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
|
||
finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
|
||
BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
|
||
finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
|
||
/* Note that it is OK if symver_sec is NULL. */
|
||
}
|
||
|
||
finfo.contents = NULL;
|
||
finfo.external_relocs = NULL;
|
||
finfo.internal_relocs = NULL;
|
||
finfo.external_syms = NULL;
|
||
finfo.locsym_shndx = NULL;
|
||
finfo.internal_syms = NULL;
|
||
finfo.indices = NULL;
|
||
finfo.sections = NULL;
|
||
finfo.symbuf = NULL;
|
||
finfo.symshndxbuf = NULL;
|
||
finfo.symbuf_count = 0;
|
||
finfo.shndxbuf_size = 0;
|
||
finfo.first_tls_sec = NULL;
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
if ((o->flags & SEC_THREAD_LOCAL) != 0
|
||
&& (o->flags & SEC_LOAD) != 0)
|
||
{
|
||
finfo.first_tls_sec = o;
|
||
break;
|
||
}
|
||
|
||
/* Count up the number of relocations we will output for each output
|
||
section, so that we know the sizes of the reloc sections. We
|
||
also figure out some maximum sizes. */
|
||
max_contents_size = 0;
|
||
max_external_reloc_size = 0;
|
||
max_internal_reloc_count = 0;
|
||
max_sym_count = 0;
|
||
max_sym_shndx_count = 0;
|
||
merged = FALSE;
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
struct bfd_elf_section_data *esdo = elf_section_data (o);
|
||
o->reloc_count = 0;
|
||
|
||
for (p = o->link_order_head; p != NULL; p = p->next)
|
||
{
|
||
unsigned int reloc_count = 0;
|
||
struct bfd_elf_section_data *esdi = NULL;
|
||
unsigned int *rel_count1;
|
||
|
||
if (p->type == bfd_section_reloc_link_order
|
||
|| p->type == bfd_symbol_reloc_link_order)
|
||
reloc_count = 1;
|
||
else if (p->type == bfd_indirect_link_order)
|
||
{
|
||
asection *sec;
|
||
|
||
sec = p->u.indirect.section;
|
||
esdi = elf_section_data (sec);
|
||
|
||
/* Mark all sections which are to be included in the
|
||
link. This will normally be every section. We need
|
||
to do this so that we can identify any sections which
|
||
the linker has decided to not include. */
|
||
sec->linker_mark = TRUE;
|
||
|
||
if (sec->flags & SEC_MERGE)
|
||
merged = TRUE;
|
||
|
||
if (info->relocatable || info->emitrelocations)
|
||
reloc_count = sec->reloc_count;
|
||
else if (bed->elf_backend_count_relocs)
|
||
{
|
||
Elf_Internal_Rela * relocs;
|
||
|
||
relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
|
||
info->keep_memory);
|
||
|
||
reloc_count = (*bed->elf_backend_count_relocs) (sec, relocs);
|
||
|
||
if (elf_section_data (o)->relocs != relocs)
|
||
free (relocs);
|
||
}
|
||
|
||
if (sec->_raw_size > max_contents_size)
|
||
max_contents_size = sec->_raw_size;
|
||
if (sec->_cooked_size > max_contents_size)
|
||
max_contents_size = sec->_cooked_size;
|
||
|
||
/* We are interested in just local symbols, not all
|
||
symbols. */
|
||
if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
|
||
&& (sec->owner->flags & DYNAMIC) == 0)
|
||
{
|
||
size_t sym_count;
|
||
|
||
if (elf_bad_symtab (sec->owner))
|
||
sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
|
||
/ sizeof (Elf_External_Sym));
|
||
else
|
||
sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
|
||
|
||
if (sym_count > max_sym_count)
|
||
max_sym_count = sym_count;
|
||
|
||
if (sym_count > max_sym_shndx_count
|
||
&& elf_symtab_shndx (sec->owner) != 0)
|
||
max_sym_shndx_count = sym_count;
|
||
|
||
if ((sec->flags & SEC_RELOC) != 0)
|
||
{
|
||
size_t ext_size;
|
||
|
||
ext_size = elf_section_data (sec)->rel_hdr.sh_size;
|
||
if (ext_size > max_external_reloc_size)
|
||
max_external_reloc_size = ext_size;
|
||
if (sec->reloc_count > max_internal_reloc_count)
|
||
max_internal_reloc_count = sec->reloc_count;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (reloc_count == 0)
|
||
continue;
|
||
|
||
o->reloc_count += reloc_count;
|
||
|
||
/* MIPS may have a mix of REL and RELA relocs on sections.
|
||
To support this curious ABI we keep reloc counts in
|
||
elf_section_data too. We must be careful to add the
|
||
relocations from the input section to the right output
|
||
count. FIXME: Get rid of one count. We have
|
||
o->reloc_count == esdo->rel_count + esdo->rel_count2. */
|
||
rel_count1 = &esdo->rel_count;
|
||
if (esdi != NULL)
|
||
{
|
||
bfd_boolean same_size;
|
||
bfd_size_type entsize1;
|
||
|
||
entsize1 = esdi->rel_hdr.sh_entsize;
|
||
BFD_ASSERT (entsize1 == sizeof (Elf_External_Rel)
|
||
|| entsize1 == sizeof (Elf_External_Rela));
|
||
same_size = (!o->use_rela_p
|
||
== (entsize1 == sizeof (Elf_External_Rel)));
|
||
|
||
if (!same_size)
|
||
rel_count1 = &esdo->rel_count2;
|
||
|
||
if (esdi->rel_hdr2 != NULL)
|
||
{
|
||
bfd_size_type entsize2 = esdi->rel_hdr2->sh_entsize;
|
||
unsigned int alt_count;
|
||
unsigned int *rel_count2;
|
||
|
||
BFD_ASSERT (entsize2 != entsize1
|
||
&& (entsize2 == sizeof (Elf_External_Rel)
|
||
|| entsize2 == sizeof (Elf_External_Rela)));
|
||
|
||
rel_count2 = &esdo->rel_count2;
|
||
if (!same_size)
|
||
rel_count2 = &esdo->rel_count;
|
||
|
||
/* The following is probably too simplistic if the
|
||
backend counts output relocs unusually. */
|
||
BFD_ASSERT (bed->elf_backend_count_relocs == NULL);
|
||
alt_count = NUM_SHDR_ENTRIES (esdi->rel_hdr2);
|
||
*rel_count2 += alt_count;
|
||
reloc_count -= alt_count;
|
||
}
|
||
}
|
||
*rel_count1 += reloc_count;
|
||
}
|
||
|
||
if (o->reloc_count > 0)
|
||
o->flags |= SEC_RELOC;
|
||
else
|
||
{
|
||
/* Explicitly clear the SEC_RELOC flag. The linker tends to
|
||
set it (this is probably a bug) and if it is set
|
||
assign_section_numbers will create a reloc section. */
|
||
o->flags &=~ SEC_RELOC;
|
||
}
|
||
|
||
/* If the SEC_ALLOC flag is not set, force the section VMA to
|
||
zero. This is done in elf_fake_sections as well, but forcing
|
||
the VMA to 0 here will ensure that relocs against these
|
||
sections are handled correctly. */
|
||
if ((o->flags & SEC_ALLOC) == 0
|
||
&& ! o->user_set_vma)
|
||
o->vma = 0;
|
||
}
|
||
|
||
if (! info->relocatable && merged)
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
_bfd_elf_link_sec_merge_syms, abfd);
|
||
|
||
/* Figure out the file positions for everything but the symbol table
|
||
and the relocs. We set symcount to force assign_section_numbers
|
||
to create a symbol table. */
|
||
bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
|
||
BFD_ASSERT (! abfd->output_has_begun);
|
||
if (! _bfd_elf_compute_section_file_positions (abfd, info))
|
||
goto error_return;
|
||
|
||
/* That created the reloc sections. Set their sizes, and assign
|
||
them file positions, and allocate some buffers. */
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_RELOC) != 0)
|
||
{
|
||
if (!(_bfd_elf_link_size_reloc_section
|
||
(abfd, &elf_section_data (o)->rel_hdr, o)))
|
||
goto error_return;
|
||
|
||
if (elf_section_data (o)->rel_hdr2
|
||
&& !(_bfd_elf_link_size_reloc_section
|
||
(abfd, elf_section_data (o)->rel_hdr2, o)))
|
||
goto error_return;
|
||
}
|
||
|
||
/* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
|
||
to count upwards while actually outputting the relocations. */
|
||
elf_section_data (o)->rel_count = 0;
|
||
elf_section_data (o)->rel_count2 = 0;
|
||
}
|
||
|
||
_bfd_elf_assign_file_positions_for_relocs (abfd);
|
||
|
||
/* We have now assigned file positions for all the sections except
|
||
.symtab and .strtab. We start the .symtab section at the current
|
||
file position, and write directly to it. We build the .strtab
|
||
section in memory. */
|
||
bfd_get_symcount (abfd) = 0;
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
/* sh_name is set in prep_headers. */
|
||
symtab_hdr->sh_type = SHT_SYMTAB;
|
||
/* sh_flags, sh_addr and sh_size all start off zero. */
|
||
symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
|
||
/* sh_link is set in assign_section_numbers. */
|
||
/* sh_info is set below. */
|
||
/* sh_offset is set just below. */
|
||
symtab_hdr->sh_addralign = 1 << bed->s->log_file_align;
|
||
|
||
off = elf_tdata (abfd)->next_file_pos;
|
||
off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
|
||
|
||
/* Note that at this point elf_tdata (abfd)->next_file_pos is
|
||
incorrect. We do not yet know the size of the .symtab section.
|
||
We correct next_file_pos below, after we do know the size. */
|
||
|
||
/* Allocate a buffer to hold swapped out symbols. This is to avoid
|
||
continuously seeking to the right position in the file. */
|
||
if (! info->keep_memory || max_sym_count < 20)
|
||
finfo.symbuf_size = 20;
|
||
else
|
||
finfo.symbuf_size = max_sym_count;
|
||
amt = finfo.symbuf_size;
|
||
amt *= sizeof (Elf_External_Sym);
|
||
finfo.symbuf = bfd_malloc (amt);
|
||
if (finfo.symbuf == NULL)
|
||
goto error_return;
|
||
if (elf_numsections (abfd) > SHN_LORESERVE)
|
||
{
|
||
/* Wild guess at number of output symbols. realloc'd as needed. */
|
||
amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
|
||
finfo.shndxbuf_size = amt;
|
||
amt *= sizeof (Elf_External_Sym_Shndx);
|
||
finfo.symshndxbuf = bfd_zmalloc (amt);
|
||
if (finfo.symshndxbuf == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
/* Start writing out the symbol table. The first symbol is always a
|
||
dummy symbol. */
|
||
if (info->strip != strip_all
|
||
|| emit_relocs)
|
||
{
|
||
elfsym.st_value = 0;
|
||
elfsym.st_size = 0;
|
||
elfsym.st_info = 0;
|
||
elfsym.st_other = 0;
|
||
elfsym.st_shndx = SHN_UNDEF;
|
||
if (! elf_link_output_sym (&finfo, NULL, &elfsym, bfd_und_section_ptr))
|
||
goto error_return;
|
||
}
|
||
|
||
#if 0
|
||
/* Some standard ELF linkers do this, but we don't because it causes
|
||
bootstrap comparison failures. */
|
||
/* Output a file symbol for the output file as the second symbol.
|
||
We output this even if we are discarding local symbols, although
|
||
I'm not sure if this is correct. */
|
||
elfsym.st_value = 0;
|
||
elfsym.st_size = 0;
|
||
elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
|
||
elfsym.st_other = 0;
|
||
elfsym.st_shndx = SHN_ABS;
|
||
if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
|
||
&elfsym, bfd_abs_section_ptr))
|
||
goto error_return;
|
||
#endif
|
||
|
||
/* Output a symbol for each section. We output these even if we are
|
||
discarding local symbols, since they are used for relocs. These
|
||
symbols have no names. We store the index of each one in the
|
||
index field of the section, so that we can find it again when
|
||
outputting relocs. */
|
||
if (info->strip != strip_all
|
||
|| emit_relocs)
|
||
{
|
||
elfsym.st_size = 0;
|
||
elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
|
||
elfsym.st_other = 0;
|
||
for (i = 1; i < elf_numsections (abfd); i++)
|
||
{
|
||
o = section_from_elf_index (abfd, i);
|
||
if (o != NULL)
|
||
o->target_index = bfd_get_symcount (abfd);
|
||
elfsym.st_shndx = i;
|
||
if (info->relocatable || o == NULL)
|
||
elfsym.st_value = 0;
|
||
else
|
||
elfsym.st_value = o->vma;
|
||
if (! elf_link_output_sym (&finfo, NULL, &elfsym, o))
|
||
goto error_return;
|
||
if (i == SHN_LORESERVE - 1)
|
||
i += SHN_HIRESERVE + 1 - SHN_LORESERVE;
|
||
}
|
||
}
|
||
|
||
/* Allocate some memory to hold information read in from the input
|
||
files. */
|
||
if (max_contents_size != 0)
|
||
{
|
||
finfo.contents = bfd_malloc (max_contents_size);
|
||
if (finfo.contents == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (max_external_reloc_size != 0)
|
||
{
|
||
finfo.external_relocs = bfd_malloc (max_external_reloc_size);
|
||
if (finfo.external_relocs == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (max_internal_reloc_count != 0)
|
||
{
|
||
amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
|
||
amt *= sizeof (Elf_Internal_Rela);
|
||
finfo.internal_relocs = bfd_malloc (amt);
|
||
if (finfo.internal_relocs == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (max_sym_count != 0)
|
||
{
|
||
amt = max_sym_count * sizeof (Elf_External_Sym);
|
||
finfo.external_syms = bfd_malloc (amt);
|
||
if (finfo.external_syms == NULL)
|
||
goto error_return;
|
||
|
||
amt = max_sym_count * sizeof (Elf_Internal_Sym);
|
||
finfo.internal_syms = bfd_malloc (amt);
|
||
if (finfo.internal_syms == NULL)
|
||
goto error_return;
|
||
|
||
amt = max_sym_count * sizeof (long);
|
||
finfo.indices = bfd_malloc (amt);
|
||
if (finfo.indices == NULL)
|
||
goto error_return;
|
||
|
||
amt = max_sym_count * sizeof (asection *);
|
||
finfo.sections = bfd_malloc (amt);
|
||
if (finfo.sections == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (max_sym_shndx_count != 0)
|
||
{
|
||
amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
|
||
finfo.locsym_shndx = bfd_malloc (amt);
|
||
if (finfo.locsym_shndx == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
if (finfo.first_tls_sec)
|
||
{
|
||
unsigned int align = 0;
|
||
bfd_vma base = finfo.first_tls_sec->vma, end = 0;
|
||
asection *sec;
|
||
|
||
for (sec = finfo.first_tls_sec;
|
||
sec && (sec->flags & SEC_THREAD_LOCAL);
|
||
sec = sec->next)
|
||
{
|
||
bfd_vma size = sec->_raw_size;
|
||
|
||
if (bfd_get_section_alignment (abfd, sec) > align)
|
||
align = bfd_get_section_alignment (abfd, sec);
|
||
if (sec->_raw_size == 0 && (sec->flags & SEC_HAS_CONTENTS) == 0)
|
||
{
|
||
struct bfd_link_order *o;
|
||
|
||
size = 0;
|
||
for (o = sec->link_order_head; o != NULL; o = o->next)
|
||
if (size < o->offset + o->size)
|
||
size = o->offset + o->size;
|
||
}
|
||
end = sec->vma + size;
|
||
}
|
||
elf_hash_table (info)->tls_segment
|
||
= bfd_zalloc (abfd, sizeof (struct elf_link_tls_segment));
|
||
if (elf_hash_table (info)->tls_segment == NULL)
|
||
goto error_return;
|
||
elf_hash_table (info)->tls_segment->start = base;
|
||
elf_hash_table (info)->tls_segment->size = end - base;
|
||
elf_hash_table (info)->tls_segment->align = align;
|
||
}
|
||
|
||
/* Since ELF permits relocations to be against local symbols, we
|
||
must have the local symbols available when we do the relocations.
|
||
Since we would rather only read the local symbols once, and we
|
||
would rather not keep them in memory, we handle all the
|
||
relocations for a single input file at the same time.
|
||
|
||
Unfortunately, there is no way to know the total number of local
|
||
symbols until we have seen all of them, and the local symbol
|
||
indices precede the global symbol indices. This means that when
|
||
we are generating relocatable output, and we see a reloc against
|
||
a global symbol, we can not know the symbol index until we have
|
||
finished examining all the local symbols to see which ones we are
|
||
going to output. To deal with this, we keep the relocations in
|
||
memory, and don't output them until the end of the link. This is
|
||
an unfortunate waste of memory, but I don't see a good way around
|
||
it. Fortunately, it only happens when performing a relocatable
|
||
link, which is not the common case. FIXME: If keep_memory is set
|
||
we could write the relocs out and then read them again; I don't
|
||
know how bad the memory loss will be. */
|
||
|
||
for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
|
||
sub->output_has_begun = FALSE;
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
for (p = o->link_order_head; p != NULL; p = p->next)
|
||
{
|
||
if (p->type == bfd_indirect_link_order
|
||
&& (bfd_get_flavour ((sub = p->u.indirect.section->owner))
|
||
== bfd_target_elf_flavour)
|
||
&& elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
|
||
{
|
||
if (! sub->output_has_begun)
|
||
{
|
||
if (! elf_link_input_bfd (&finfo, sub))
|
||
goto error_return;
|
||
sub->output_has_begun = TRUE;
|
||
}
|
||
}
|
||
else if (p->type == bfd_section_reloc_link_order
|
||
|| p->type == bfd_symbol_reloc_link_order)
|
||
{
|
||
if (! elf_reloc_link_order (abfd, info, o, p))
|
||
goto error_return;
|
||
}
|
||
else
|
||
{
|
||
if (! _bfd_default_link_order (abfd, info, o, p))
|
||
goto error_return;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Output any global symbols that got converted to local in a
|
||
version script or due to symbol visibility. We do this in a
|
||
separate step since ELF requires all local symbols to appear
|
||
prior to any global symbols. FIXME: We should only do this if
|
||
some global symbols were, in fact, converted to become local.
|
||
FIXME: Will this work correctly with the Irix 5 linker? */
|
||
eoinfo.failed = FALSE;
|
||
eoinfo.finfo = &finfo;
|
||
eoinfo.localsyms = TRUE;
|
||
elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
|
||
&eoinfo);
|
||
if (eoinfo.failed)
|
||
return FALSE;
|
||
|
||
/* That wrote out all the local symbols. Finish up the symbol table
|
||
with the global symbols. Even if we want to strip everything we
|
||
can, we still need to deal with those global symbols that got
|
||
converted to local in a version script. */
|
||
|
||
/* The sh_info field records the index of the first non local symbol. */
|
||
symtab_hdr->sh_info = bfd_get_symcount (abfd);
|
||
|
||
if (dynamic
|
||
&& finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
|
||
{
|
||
Elf_Internal_Sym sym;
|
||
Elf_External_Sym *dynsym =
|
||
(Elf_External_Sym *) finfo.dynsym_sec->contents;
|
||
long last_local = 0;
|
||
|
||
/* Write out the section symbols for the output sections. */
|
||
if (info->shared)
|
||
{
|
||
asection *s;
|
||
|
||
sym.st_size = 0;
|
||
sym.st_name = 0;
|
||
sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
|
||
sym.st_other = 0;
|
||
|
||
for (s = abfd->sections; s != NULL; s = s->next)
|
||
{
|
||
int indx;
|
||
Elf_External_Sym *dest;
|
||
|
||
indx = elf_section_data (s)->this_idx;
|
||
BFD_ASSERT (indx > 0);
|
||
sym.st_shndx = indx;
|
||
sym.st_value = s->vma;
|
||
dest = dynsym + elf_section_data (s)->dynindx;
|
||
elf_swap_symbol_out (abfd, &sym, dest, 0);
|
||
}
|
||
|
||
last_local = bfd_count_sections (abfd);
|
||
}
|
||
|
||
/* Write out the local dynsyms. */
|
||
if (elf_hash_table (info)->dynlocal)
|
||
{
|
||
struct elf_link_local_dynamic_entry *e;
|
||
for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
|
||
{
|
||
asection *s;
|
||
Elf_External_Sym *dest;
|
||
|
||
sym.st_size = e->isym.st_size;
|
||
sym.st_other = e->isym.st_other;
|
||
|
||
/* Copy the internal symbol as is.
|
||
Note that we saved a word of storage and overwrote
|
||
the original st_name with the dynstr_index. */
|
||
sym = e->isym;
|
||
|
||
if (e->isym.st_shndx != SHN_UNDEF
|
||
&& (e->isym.st_shndx < SHN_LORESERVE
|
||
|| e->isym.st_shndx > SHN_HIRESERVE))
|
||
{
|
||
s = bfd_section_from_elf_index (e->input_bfd,
|
||
e->isym.st_shndx);
|
||
|
||
sym.st_shndx =
|
||
elf_section_data (s->output_section)->this_idx;
|
||
sym.st_value = (s->output_section->vma
|
||
+ s->output_offset
|
||
+ e->isym.st_value);
|
||
}
|
||
|
||
if (last_local < e->dynindx)
|
||
last_local = e->dynindx;
|
||
|
||
dest = dynsym + e->dynindx;
|
||
elf_swap_symbol_out (abfd, &sym, dest, 0);
|
||
}
|
||
}
|
||
|
||
elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
|
||
last_local + 1;
|
||
}
|
||
|
||
/* We get the global symbols from the hash table. */
|
||
eoinfo.failed = FALSE;
|
||
eoinfo.localsyms = FALSE;
|
||
eoinfo.finfo = &finfo;
|
||
elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
|
||
&eoinfo);
|
||
if (eoinfo.failed)
|
||
return FALSE;
|
||
|
||
/* If backend needs to output some symbols not present in the hash
|
||
table, do it now. */
|
||
if (bed->elf_backend_output_arch_syms)
|
||
{
|
||
typedef bfd_boolean (*out_sym_func)
|
||
(void *, const char *, Elf_Internal_Sym *, asection *);
|
||
|
||
if (! ((*bed->elf_backend_output_arch_syms)
|
||
(abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
|
||
return FALSE;
|
||
}
|
||
|
||
/* Flush all symbols to the file. */
|
||
if (! elf_link_flush_output_syms (&finfo))
|
||
return FALSE;
|
||
|
||
/* Now we know the size of the symtab section. */
|
||
off += symtab_hdr->sh_size;
|
||
|
||
symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
|
||
if (symtab_shndx_hdr->sh_name != 0)
|
||
{
|
||
symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
|
||
symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
|
||
symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
|
||
amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
|
||
symtab_shndx_hdr->sh_size = amt;
|
||
|
||
off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
|
||
off, TRUE);
|
||
|
||
if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
|
||
|| (bfd_bwrite (finfo.symshndxbuf, amt, abfd) != amt))
|
||
return FALSE;
|
||
}
|
||
|
||
|
||
/* Finish up and write out the symbol string table (.strtab)
|
||
section. */
|
||
symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
|
||
/* sh_name was set in prep_headers. */
|
||
symstrtab_hdr->sh_type = SHT_STRTAB;
|
||
symstrtab_hdr->sh_flags = 0;
|
||
symstrtab_hdr->sh_addr = 0;
|
||
symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
|
||
symstrtab_hdr->sh_entsize = 0;
|
||
symstrtab_hdr->sh_link = 0;
|
||
symstrtab_hdr->sh_info = 0;
|
||
/* sh_offset is set just below. */
|
||
symstrtab_hdr->sh_addralign = 1;
|
||
|
||
off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
|
||
elf_tdata (abfd)->next_file_pos = off;
|
||
|
||
if (bfd_get_symcount (abfd) > 0)
|
||
{
|
||
if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
|
||
|| ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
|
||
return FALSE;
|
||
}
|
||
|
||
/* Adjust the relocs to have the correct symbol indices. */
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_RELOC) == 0)
|
||
continue;
|
||
|
||
elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
|
||
elf_section_data (o)->rel_count,
|
||
elf_section_data (o)->rel_hashes);
|
||
if (elf_section_data (o)->rel_hdr2 != NULL)
|
||
elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
|
||
elf_section_data (o)->rel_count2,
|
||
(elf_section_data (o)->rel_hashes
|
||
+ elf_section_data (o)->rel_count));
|
||
|
||
/* Set the reloc_count field to 0 to prevent write_relocs from
|
||
trying to swap the relocs out itself. */
|
||
o->reloc_count = 0;
|
||
}
|
||
|
||
if (dynamic && info->combreloc && dynobj != NULL)
|
||
relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
|
||
|
||
/* If we are linking against a dynamic object, or generating a
|
||
shared library, finish up the dynamic linking information. */
|
||
if (dynamic)
|
||
{
|
||
Elf_External_Dyn *dyncon, *dynconend;
|
||
|
||
/* Fix up .dynamic entries. */
|
||
o = bfd_get_section_by_name (dynobj, ".dynamic");
|
||
BFD_ASSERT (o != NULL);
|
||
|
||
dyncon = (Elf_External_Dyn *) o->contents;
|
||
dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
|
||
for (; dyncon < dynconend; dyncon++)
|
||
{
|
||
Elf_Internal_Dyn dyn;
|
||
const char *name;
|
||
unsigned int type;
|
||
|
||
elf_swap_dyn_in (dynobj, dyncon, &dyn);
|
||
|
||
switch (dyn.d_tag)
|
||
{
|
||
default:
|
||
break;
|
||
case DT_NULL:
|
||
if (relativecount > 0 && dyncon + 1 < dynconend)
|
||
{
|
||
switch (elf_section_data (reldyn)->this_hdr.sh_type)
|
||
{
|
||
case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
|
||
case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
|
||
default: break;
|
||
}
|
||
if (dyn.d_tag != DT_NULL)
|
||
{
|
||
dyn.d_un.d_val = relativecount;
|
||
elf_swap_dyn_out (dynobj, &dyn, dyncon);
|
||
relativecount = 0;
|
||
}
|
||
}
|
||
break;
|
||
case DT_INIT:
|
||
name = info->init_function;
|
||
goto get_sym;
|
||
case DT_FINI:
|
||
name = info->fini_function;
|
||
get_sym:
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = elf_link_hash_lookup (elf_hash_table (info), name,
|
||
FALSE, FALSE, TRUE);
|
||
if (h != NULL
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak))
|
||
{
|
||
dyn.d_un.d_val = h->root.u.def.value;
|
||
o = h->root.u.def.section;
|
||
if (o->output_section != NULL)
|
||
dyn.d_un.d_val += (o->output_section->vma
|
||
+ o->output_offset);
|
||
else
|
||
{
|
||
/* The symbol is imported from another shared
|
||
library and does not apply to this one. */
|
||
dyn.d_un.d_val = 0;
|
||
}
|
||
|
||
elf_swap_dyn_out (dynobj, &dyn, dyncon);
|
||
}
|
||
}
|
||
break;
|
||
|
||
case DT_PREINIT_ARRAYSZ:
|
||
name = ".preinit_array";
|
||
goto get_size;
|
||
case DT_INIT_ARRAYSZ:
|
||
name = ".init_array";
|
||
goto get_size;
|
||
case DT_FINI_ARRAYSZ:
|
||
name = ".fini_array";
|
||
get_size:
|
||
o = bfd_get_section_by_name (abfd, name);
|
||
if (o == NULL)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: could not find output section %s"),
|
||
bfd_get_filename (abfd), name);
|
||
goto error_return;
|
||
}
|
||
if (o->_raw_size == 0)
|
||
(*_bfd_error_handler)
|
||
(_("warning: %s section has zero size"), name);
|
||
dyn.d_un.d_val = o->_raw_size;
|
||
elf_swap_dyn_out (dynobj, &dyn, dyncon);
|
||
break;
|
||
|
||
case DT_PREINIT_ARRAY:
|
||
name = ".preinit_array";
|
||
goto get_vma;
|
||
case DT_INIT_ARRAY:
|
||
name = ".init_array";
|
||
goto get_vma;
|
||
case DT_FINI_ARRAY:
|
||
name = ".fini_array";
|
||
goto get_vma;
|
||
|
||
case DT_HASH:
|
||
name = ".hash";
|
||
goto get_vma;
|
||
case DT_STRTAB:
|
||
name = ".dynstr";
|
||
goto get_vma;
|
||
case DT_SYMTAB:
|
||
name = ".dynsym";
|
||
goto get_vma;
|
||
case DT_VERDEF:
|
||
name = ".gnu.version_d";
|
||
goto get_vma;
|
||
case DT_VERNEED:
|
||
name = ".gnu.version_r";
|
||
goto get_vma;
|
||
case DT_VERSYM:
|
||
name = ".gnu.version";
|
||
get_vma:
|
||
o = bfd_get_section_by_name (abfd, name);
|
||
if (o == NULL)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: could not find output section %s"),
|
||
bfd_get_filename (abfd), name);
|
||
goto error_return;
|
||
}
|
||
dyn.d_un.d_ptr = o->vma;
|
||
elf_swap_dyn_out (dynobj, &dyn, dyncon);
|
||
break;
|
||
|
||
case DT_REL:
|
||
case DT_RELA:
|
||
case DT_RELSZ:
|
||
case DT_RELASZ:
|
||
if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
|
||
type = SHT_REL;
|
||
else
|
||
type = SHT_RELA;
|
||
dyn.d_un.d_val = 0;
|
||
for (i = 1; i < elf_numsections (abfd); i++)
|
||
{
|
||
Elf_Internal_Shdr *hdr;
|
||
|
||
hdr = elf_elfsections (abfd)[i];
|
||
if (hdr->sh_type == type
|
||
&& (hdr->sh_flags & SHF_ALLOC) != 0)
|
||
{
|
||
if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
|
||
dyn.d_un.d_val += hdr->sh_size;
|
||
else
|
||
{
|
||
if (dyn.d_un.d_val == 0
|
||
|| hdr->sh_addr < dyn.d_un.d_val)
|
||
dyn.d_un.d_val = hdr->sh_addr;
|
||
}
|
||
}
|
||
}
|
||
elf_swap_dyn_out (dynobj, &dyn, dyncon);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* If we have created any dynamic sections, then output them. */
|
||
if (dynobj != NULL)
|
||
{
|
||
if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
|
||
goto error_return;
|
||
|
||
for (o = dynobj->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_HAS_CONTENTS) == 0
|
||
|| o->_raw_size == 0
|
||
|| o->output_section == bfd_abs_section_ptr)
|
||
continue;
|
||
if ((o->flags & SEC_LINKER_CREATED) == 0)
|
||
{
|
||
/* At this point, we are only interested in sections
|
||
created by _bfd_elf_link_create_dynamic_sections. */
|
||
continue;
|
||
}
|
||
if ((elf_section_data (o->output_section)->this_hdr.sh_type
|
||
!= SHT_STRTAB)
|
||
|| strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
|
||
{
|
||
if (! bfd_set_section_contents (abfd, o->output_section,
|
||
o->contents,
|
||
(file_ptr) o->output_offset,
|
||
o->_raw_size))
|
||
goto error_return;
|
||
}
|
||
else
|
||
{
|
||
/* The contents of the .dynstr section are actually in a
|
||
stringtab. */
|
||
off = elf_section_data (o->output_section)->this_hdr.sh_offset;
|
||
if (bfd_seek (abfd, off, SEEK_SET) != 0
|
||
|| ! _bfd_elf_strtab_emit (abfd,
|
||
elf_hash_table (info)->dynstr))
|
||
goto error_return;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (info->relocatable)
|
||
{
|
||
bfd_boolean failed = FALSE;
|
||
|
||
bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
|
||
if (failed)
|
||
goto error_return;
|
||
}
|
||
|
||
/* If we have optimized stabs strings, output them. */
|
||
if (elf_hash_table (info)->stab_info != NULL)
|
||
{
|
||
if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
|
||
goto error_return;
|
||
}
|
||
|
||
if (info->eh_frame_hdr)
|
||
{
|
||
if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
|
||
goto error_return;
|
||
}
|
||
|
||
if (finfo.symstrtab != NULL)
|
||
_bfd_stringtab_free (finfo.symstrtab);
|
||
if (finfo.contents != NULL)
|
||
free (finfo.contents);
|
||
if (finfo.external_relocs != NULL)
|
||
free (finfo.external_relocs);
|
||
if (finfo.internal_relocs != NULL)
|
||
free (finfo.internal_relocs);
|
||
if (finfo.external_syms != NULL)
|
||
free (finfo.external_syms);
|
||
if (finfo.locsym_shndx != NULL)
|
||
free (finfo.locsym_shndx);
|
||
if (finfo.internal_syms != NULL)
|
||
free (finfo.internal_syms);
|
||
if (finfo.indices != NULL)
|
||
free (finfo.indices);
|
||
if (finfo.sections != NULL)
|
||
free (finfo.sections);
|
||
if (finfo.symbuf != NULL)
|
||
free (finfo.symbuf);
|
||
if (finfo.symshndxbuf != NULL)
|
||
free (finfo.symshndxbuf);
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_RELOC) != 0
|
||
&& elf_section_data (o)->rel_hashes != NULL)
|
||
free (elf_section_data (o)->rel_hashes);
|
||
}
|
||
|
||
elf_tdata (abfd)->linker = TRUE;
|
||
|
||
return TRUE;
|
||
|
||
error_return:
|
||
if (finfo.symstrtab != NULL)
|
||
_bfd_stringtab_free (finfo.symstrtab);
|
||
if (finfo.contents != NULL)
|
||
free (finfo.contents);
|
||
if (finfo.external_relocs != NULL)
|
||
free (finfo.external_relocs);
|
||
if (finfo.internal_relocs != NULL)
|
||
free (finfo.internal_relocs);
|
||
if (finfo.external_syms != NULL)
|
||
free (finfo.external_syms);
|
||
if (finfo.locsym_shndx != NULL)
|
||
free (finfo.locsym_shndx);
|
||
if (finfo.internal_syms != NULL)
|
||
free (finfo.internal_syms);
|
||
if (finfo.indices != NULL)
|
||
free (finfo.indices);
|
||
if (finfo.sections != NULL)
|
||
free (finfo.sections);
|
||
if (finfo.symbuf != NULL)
|
||
free (finfo.symbuf);
|
||
if (finfo.symshndxbuf != NULL)
|
||
free (finfo.symshndxbuf);
|
||
for (o = abfd->sections; o != NULL; o = o->next)
|
||
{
|
||
if ((o->flags & SEC_RELOC) != 0
|
||
&& elf_section_data (o)->rel_hashes != NULL)
|
||
free (elf_section_data (o)->rel_hashes);
|
||
}
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/* Add a symbol to the output symbol table. */
|
||
|
||
static bfd_boolean
|
||
elf_link_output_sym (struct elf_final_link_info *finfo,
|
||
const char *name,
|
||
Elf_Internal_Sym *elfsym,
|
||
asection *input_sec)
|
||
{
|
||
Elf_External_Sym *dest;
|
||
Elf_External_Sym_Shndx *destshndx;
|
||
bfd_boolean (*output_symbol_hook)
|
||
(bfd *, struct bfd_link_info *info, const char *,
|
||
Elf_Internal_Sym *, asection *);
|
||
|
||
output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
|
||
elf_backend_link_output_symbol_hook;
|
||
if (output_symbol_hook != NULL)
|
||
{
|
||
if (! ((*output_symbol_hook)
|
||
(finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
|
||
return FALSE;
|
||
}
|
||
|
||
if (name == NULL || *name == '\0')
|
||
elfsym->st_name = 0;
|
||
else if (input_sec->flags & SEC_EXCLUDE)
|
||
elfsym->st_name = 0;
|
||
else
|
||
{
|
||
elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
|
||
name, TRUE, FALSE);
|
||
if (elfsym->st_name == (unsigned long) -1)
|
||
return FALSE;
|
||
}
|
||
|
||
if (finfo->symbuf_count >= finfo->symbuf_size)
|
||
{
|
||
if (! elf_link_flush_output_syms (finfo))
|
||
return FALSE;
|
||
}
|
||
|
||
dest = finfo->symbuf + finfo->symbuf_count;
|
||
destshndx = finfo->symshndxbuf;
|
||
if (destshndx != NULL)
|
||
{
|
||
if (bfd_get_symcount (finfo->output_bfd) >= finfo->shndxbuf_size)
|
||
{
|
||
bfd_size_type amt;
|
||
|
||
amt = finfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
|
||
finfo->symshndxbuf = destshndx = bfd_realloc (destshndx, amt * 2);
|
||
if (destshndx == NULL)
|
||
return FALSE;
|
||
memset ((char *) destshndx + amt, 0, amt);
|
||
finfo->shndxbuf_size *= 2;
|
||
}
|
||
destshndx += bfd_get_symcount (finfo->output_bfd);
|
||
}
|
||
|
||
elf_swap_symbol_out (finfo->output_bfd, elfsym, dest, destshndx);
|
||
finfo->symbuf_count += 1;
|
||
bfd_get_symcount (finfo->output_bfd) += 1;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Flush the output symbols to the file. */
|
||
|
||
static bfd_boolean
|
||
elf_link_flush_output_syms (struct elf_final_link_info *finfo)
|
||
{
|
||
if (finfo->symbuf_count > 0)
|
||
{
|
||
Elf_Internal_Shdr *hdr;
|
||
file_ptr pos;
|
||
bfd_size_type amt;
|
||
|
||
hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
|
||
pos = hdr->sh_offset + hdr->sh_size;
|
||
amt = finfo->symbuf_count * sizeof (Elf_External_Sym);
|
||
if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
|
||
|| bfd_bwrite (finfo->symbuf, amt, finfo->output_bfd) != amt)
|
||
return FALSE;
|
||
|
||
hdr->sh_size += amt;
|
||
finfo->symbuf_count = 0;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
|
||
allowing an unsatisfied unversioned symbol in the DSO to match a
|
||
versioned symbol that would normally require an explicit version.
|
||
We also handle the case that a DSO references a hidden symbol
|
||
which may be satisfied by a versioned symbol in another DSO. */
|
||
|
||
static bfd_boolean
|
||
elf_link_check_versioned_symbol (struct bfd_link_info *info,
|
||
struct elf_link_hash_entry *h)
|
||
{
|
||
bfd *abfd;
|
||
struct elf_link_loaded_list *loaded;
|
||
|
||
if (info->hash->creator->flavour != bfd_target_elf_flavour)
|
||
return FALSE;
|
||
|
||
switch (h->root.type)
|
||
{
|
||
default:
|
||
abfd = NULL;
|
||
break;
|
||
|
||
case bfd_link_hash_undefined:
|
||
case bfd_link_hash_undefweak:
|
||
abfd = h->root.u.undef.abfd;
|
||
if ((abfd->flags & DYNAMIC) == 0 || elf_dt_soname (abfd) == NULL)
|
||
return FALSE;
|
||
break;
|
||
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
abfd = h->root.u.def.section->owner;
|
||
break;
|
||
|
||
case bfd_link_hash_common:
|
||
abfd = h->root.u.c.p->section->owner;
|
||
break;
|
||
}
|
||
BFD_ASSERT (abfd != NULL);
|
||
|
||
for (loaded = elf_hash_table (info)->loaded;
|
||
loaded != NULL;
|
||
loaded = loaded->next)
|
||
{
|
||
bfd *input;
|
||
Elf_Internal_Shdr *hdr;
|
||
bfd_size_type symcount;
|
||
bfd_size_type extsymcount;
|
||
bfd_size_type extsymoff;
|
||
Elf_Internal_Shdr *versymhdr;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymend;
|
||
Elf_Internal_Sym *isymbuf;
|
||
Elf_External_Versym *ever;
|
||
Elf_External_Versym *extversym;
|
||
|
||
input = loaded->abfd;
|
||
|
||
/* We check each DSO for a possible hidden versioned definition. */
|
||
if (input == abfd
|
||
|| (input->flags & DYNAMIC) == 0
|
||
|| elf_dynversym (input) == 0)
|
||
continue;
|
||
|
||
hdr = &elf_tdata (input)->dynsymtab_hdr;
|
||
|
||
symcount = hdr->sh_size / sizeof (Elf_External_Sym);
|
||
if (elf_bad_symtab (input))
|
||
{
|
||
extsymcount = symcount;
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
{
|
||
extsymcount = symcount - hdr->sh_info;
|
||
extsymoff = hdr->sh_info;
|
||
}
|
||
|
||
if (extsymcount == 0)
|
||
continue;
|
||
|
||
isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
|
||
NULL, NULL, NULL);
|
||
if (isymbuf == NULL)
|
||
return FALSE;
|
||
|
||
/* Read in any version definitions. */
|
||
versymhdr = &elf_tdata (input)->dynversym_hdr;
|
||
extversym = bfd_malloc (versymhdr->sh_size);
|
||
if (extversym == NULL)
|
||
goto error_ret;
|
||
|
||
if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
|
||
|| (bfd_bread (extversym, versymhdr->sh_size, input)
|
||
!= versymhdr->sh_size))
|
||
{
|
||
free (extversym);
|
||
error_ret:
|
||
free (isymbuf);
|
||
return FALSE;
|
||
}
|
||
|
||
ever = extversym + extsymoff;
|
||
isymend = isymbuf + extsymcount;
|
||
for (isym = isymbuf; isym < isymend; isym++, ever++)
|
||
{
|
||
const char *name;
|
||
Elf_Internal_Versym iver;
|
||
unsigned short version_index;
|
||
|
||
if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
|
||
|| isym->st_shndx == SHN_UNDEF)
|
||
continue;
|
||
|
||
name = bfd_elf_string_from_elf_section (input,
|
||
hdr->sh_link,
|
||
isym->st_name);
|
||
if (strcmp (name, h->root.root.string) != 0)
|
||
continue;
|
||
|
||
_bfd_elf_swap_versym_in (input, ever, &iver);
|
||
|
||
if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
|
||
{
|
||
/* If we have a non-hidden versioned sym, then it should
|
||
have provided a definition for the undefined sym. */
|
||
abort ();
|
||
}
|
||
|
||
version_index = iver.vs_vers & VERSYM_VERSION;
|
||
if (version_index == 1 || version_index == 2)
|
||
{
|
||
/* This is the base or first version. We can use it. */
|
||
free (extversym);
|
||
free (isymbuf);
|
||
return TRUE;
|
||
}
|
||
}
|
||
|
||
free (extversym);
|
||
free (isymbuf);
|
||
}
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/* Add an external symbol to the symbol table. This is called from
|
||
the hash table traversal routine. When generating a shared object,
|
||
we go through the symbol table twice. The first time we output
|
||
anything that might have been forced to local scope in a version
|
||
script. The second time we output the symbols that are still
|
||
global symbols. */
|
||
|
||
static bfd_boolean
|
||
elf_link_output_extsym (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
struct elf_outext_info *eoinfo = data;
|
||
struct elf_final_link_info *finfo = eoinfo->finfo;
|
||
bfd_boolean strip;
|
||
Elf_Internal_Sym sym;
|
||
asection *input_sec;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
{
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
if (h->root.type == bfd_link_hash_new)
|
||
return TRUE;
|
||
}
|
||
|
||
/* Decide whether to output this symbol in this pass. */
|
||
if (eoinfo->localsyms)
|
||
{
|
||
if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
|
||
return TRUE;
|
||
}
|
||
else
|
||
{
|
||
if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
|
||
return TRUE;
|
||
}
|
||
|
||
/* If we have an undefined symbol reference here then it must have
|
||
come from a shared library that is being linked in. (Undefined
|
||
references in regular files have already been handled). If we
|
||
are reporting errors for this situation then do so now. */
|
||
if (h->root.type == bfd_link_hash_undefined
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
|
||
&& ! elf_link_check_versioned_symbol (finfo->info, h)
|
||
&& finfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
|
||
{
|
||
if (! ((*finfo->info->callbacks->undefined_symbol)
|
||
(finfo->info, h->root.root.string, h->root.u.undef.abfd,
|
||
NULL, 0, finfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR)))
|
||
{
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* We should also warn if a forced local symbol is referenced from
|
||
shared libraries. */
|
||
if (! finfo->info->relocatable
|
||
&& (! finfo->info->shared)
|
||
&& (h->elf_link_hash_flags
|
||
& (ELF_LINK_FORCED_LOCAL | ELF_LINK_HASH_REF_DYNAMIC | ELF_LINK_DYNAMIC_DEF | ELF_LINK_DYNAMIC_WEAK))
|
||
== (ELF_LINK_FORCED_LOCAL | ELF_LINK_HASH_REF_DYNAMIC)
|
||
&& ! elf_link_check_versioned_symbol (finfo->info, h))
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: %s symbol `%s' in %s is referenced by DSO"),
|
||
bfd_get_filename (finfo->output_bfd),
|
||
ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
|
||
? "internal"
|
||
: ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
|
||
? "hidden" : "local",
|
||
h->root.root.string,
|
||
bfd_archive_filename (h->root.u.def.section->owner));
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
/* We don't want to output symbols that have never been mentioned by
|
||
a regular file, or that we have been told to strip. However, if
|
||
h->indx is set to -2, the symbol is used by a reloc and we must
|
||
output it. */
|
||
if (h->indx == -2)
|
||
strip = FALSE;
|
||
else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
|
||
|| (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
|
||
strip = TRUE;
|
||
else if (finfo->info->strip == strip_all)
|
||
strip = TRUE;
|
||
else if (finfo->info->strip == strip_some
|
||
&& bfd_hash_lookup (finfo->info->keep_hash,
|
||
h->root.root.string, FALSE, FALSE) == NULL)
|
||
strip = TRUE;
|
||
else if (finfo->info->strip_discarded
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& elf_discarded_section (h->root.u.def.section))
|
||
strip = TRUE;
|
||
else
|
||
strip = FALSE;
|
||
|
||
/* If we're stripping it, and it's not a dynamic symbol, there's
|
||
nothing else to do unless it is a forced local symbol. */
|
||
if (strip
|
||
&& h->dynindx == -1
|
||
&& (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
|
||
return TRUE;
|
||
|
||
sym.st_value = 0;
|
||
sym.st_size = h->size;
|
||
sym.st_other = h->other;
|
||
if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
|
||
sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
|
||
else if (h->root.type == bfd_link_hash_undefweak
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
|
||
else
|
||
sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
|
||
|
||
switch (h->root.type)
|
||
{
|
||
default:
|
||
case bfd_link_hash_new:
|
||
case bfd_link_hash_warning:
|
||
abort ();
|
||
return FALSE;
|
||
|
||
case bfd_link_hash_undefined:
|
||
case bfd_link_hash_undefweak:
|
||
input_sec = bfd_und_section_ptr;
|
||
sym.st_shndx = SHN_UNDEF;
|
||
break;
|
||
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
{
|
||
input_sec = h->root.u.def.section;
|
||
if (input_sec->output_section != NULL)
|
||
{
|
||
sym.st_shndx =
|
||
_bfd_elf_section_from_bfd_section (finfo->output_bfd,
|
||
input_sec->output_section);
|
||
if (sym.st_shndx == SHN_BAD)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: could not find output section %s for input section %s"),
|
||
bfd_get_filename (finfo->output_bfd),
|
||
input_sec->output_section->name,
|
||
input_sec->name);
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
/* ELF symbols in relocatable files are section relative,
|
||
but in nonrelocatable files they are virtual
|
||
addresses. */
|
||
sym.st_value = h->root.u.def.value + input_sec->output_offset;
|
||
if (! finfo->info->relocatable)
|
||
{
|
||
sym.st_value += input_sec->output_section->vma;
|
||
if (h->type == STT_TLS)
|
||
{
|
||
/* STT_TLS symbols are relative to PT_TLS segment
|
||
base. */
|
||
BFD_ASSERT (finfo->first_tls_sec != NULL);
|
||
sym.st_value -= finfo->first_tls_sec->vma;
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
BFD_ASSERT (input_sec->owner == NULL
|
||
|| (input_sec->owner->flags & DYNAMIC) != 0);
|
||
sym.st_shndx = SHN_UNDEF;
|
||
input_sec = bfd_und_section_ptr;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case bfd_link_hash_common:
|
||
input_sec = h->root.u.c.p->section;
|
||
sym.st_shndx = SHN_COMMON;
|
||
sym.st_value = 1 << h->root.u.c.p->alignment_power;
|
||
break;
|
||
|
||
case bfd_link_hash_indirect:
|
||
/* These symbols are created by symbol versioning. They point
|
||
to the decorated version of the name. For example, if the
|
||
symbol foo@@GNU_1.2 is the default, which should be used when
|
||
foo is used with no version, then we add an indirect symbol
|
||
foo which points to foo@@GNU_1.2. We ignore these symbols,
|
||
since the indirected symbol is already in the hash table. */
|
||
return TRUE;
|
||
}
|
||
|
||
/* Give the processor backend a chance to tweak the symbol value,
|
||
and also to finish up anything that needs to be done for this
|
||
symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
|
||
forced local syms when non-shared is due to a historical quirk. */
|
||
if ((h->dynindx != -1
|
||
|| (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
|
||
&& ((finfo->info->shared
|
||
&& (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
|
||
|| h->root.type != bfd_link_hash_undefweak))
|
||
|| (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
|
||
&& elf_hash_table (finfo->info)->dynamic_sections_created)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
|
||
bed = get_elf_backend_data (finfo->output_bfd);
|
||
if (! ((*bed->elf_backend_finish_dynamic_symbol)
|
||
(finfo->output_bfd, finfo->info, h, &sym)))
|
||
{
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* If we are marking the symbol as undefined, and there are no
|
||
non-weak references to this symbol from a regular object, then
|
||
mark the symbol as weak undefined; if there are non-weak
|
||
references, mark the symbol as strong. We can't do this earlier,
|
||
because it might not be marked as undefined until the
|
||
finish_dynamic_symbol routine gets through with it. */
|
||
if (sym.st_shndx == SHN_UNDEF
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
|
||
&& (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
|
||
|| ELF_ST_BIND (sym.st_info) == STB_WEAK))
|
||
{
|
||
int bindtype;
|
||
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
|
||
bindtype = STB_GLOBAL;
|
||
else
|
||
bindtype = STB_WEAK;
|
||
sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
|
||
}
|
||
|
||
/* If a non-weak symbol with non-default visibility is not defined
|
||
locally, it is a fatal error. */
|
||
if (! finfo->info->relocatable
|
||
&& ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
|
||
&& ELF_ST_BIND (sym.st_info) != STB_WEAK
|
||
&& h->root.type == bfd_link_hash_undefined
|
||
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: %s symbol `%s' isn't defined"),
|
||
bfd_get_filename (finfo->output_bfd),
|
||
ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED
|
||
? "protected"
|
||
: ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL
|
||
? "internal" : "hidden",
|
||
h->root.root.string);
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
/* If this symbol should be put in the .dynsym section, then put it
|
||
there now. We already know the symbol index. We also fill in
|
||
the entry in the .hash section. */
|
||
if (h->dynindx != -1
|
||
&& elf_hash_table (finfo->info)->dynamic_sections_created)
|
||
{
|
||
size_t bucketcount;
|
||
size_t bucket;
|
||
size_t hash_entry_size;
|
||
bfd_byte *bucketpos;
|
||
bfd_vma chain;
|
||
Elf_External_Sym *esym;
|
||
|
||
sym.st_name = h->dynstr_index;
|
||
esym = (Elf_External_Sym *) finfo->dynsym_sec->contents + h->dynindx;
|
||
elf_swap_symbol_out (finfo->output_bfd, &sym, esym, 0);
|
||
|
||
bucketcount = elf_hash_table (finfo->info)->bucketcount;
|
||
bucket = h->elf_hash_value % bucketcount;
|
||
hash_entry_size
|
||
= elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
|
||
bucketpos = ((bfd_byte *) finfo->hash_sec->contents
|
||
+ (bucket + 2) * hash_entry_size);
|
||
chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
|
||
bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
|
||
bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
|
||
((bfd_byte *) finfo->hash_sec->contents
|
||
+ (bucketcount + 2 + h->dynindx) * hash_entry_size));
|
||
|
||
if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
|
||
{
|
||
Elf_Internal_Versym iversym;
|
||
Elf_External_Versym *eversym;
|
||
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
|
||
{
|
||
if (h->verinfo.verdef == NULL)
|
||
iversym.vs_vers = 0;
|
||
else
|
||
iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
|
||
}
|
||
else
|
||
{
|
||
if (h->verinfo.vertree == NULL)
|
||
iversym.vs_vers = 1;
|
||
else
|
||
iversym.vs_vers = h->verinfo.vertree->vernum + 1;
|
||
}
|
||
|
||
if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
|
||
iversym.vs_vers |= VERSYM_HIDDEN;
|
||
|
||
eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
|
||
eversym += h->dynindx;
|
||
_bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
|
||
}
|
||
}
|
||
|
||
/* If we're stripping it, then it was just a dynamic symbol, and
|
||
there's nothing else to do. */
|
||
if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
|
||
return TRUE;
|
||
|
||
h->indx = bfd_get_symcount (finfo->output_bfd);
|
||
|
||
if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
|
||
{
|
||
eoinfo->failed = TRUE;
|
||
return FALSE;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Link an input file into the linker output file. This function
|
||
handles all the sections and relocations of the input file at once.
|
||
This is so that we only have to read the local symbols once, and
|
||
don't have to keep them in memory. */
|
||
|
||
static bfd_boolean
|
||
elf_link_input_bfd (struct elf_final_link_info *finfo, bfd *input_bfd)
|
||
{
|
||
bfd_boolean (*relocate_section)
|
||
(bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
|
||
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
|
||
bfd *output_bfd;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
size_t locsymcount;
|
||
size_t extsymoff;
|
||
Elf_Internal_Sym *isymbuf;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymend;
|
||
long *pindex;
|
||
asection **ppsection;
|
||
asection *o;
|
||
const struct elf_backend_data *bed;
|
||
bfd_boolean emit_relocs;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
|
||
output_bfd = finfo->output_bfd;
|
||
bed = get_elf_backend_data (output_bfd);
|
||
relocate_section = bed->elf_backend_relocate_section;
|
||
|
||
/* If this is a dynamic object, we don't want to do anything here:
|
||
we don't want the local symbols, and we don't want the section
|
||
contents. */
|
||
if ((input_bfd->flags & DYNAMIC) != 0)
|
||
return TRUE;
|
||
|
||
emit_relocs = (finfo->info->relocatable
|
||
|| finfo->info->emitrelocations
|
||
|| bed->elf_backend_emit_relocs);
|
||
|
||
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
if (elf_bad_symtab (input_bfd))
|
||
{
|
||
locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
{
|
||
locsymcount = symtab_hdr->sh_info;
|
||
extsymoff = symtab_hdr->sh_info;
|
||
}
|
||
|
||
/* Read the local symbols. */
|
||
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
if (isymbuf == NULL && locsymcount != 0)
|
||
{
|
||
isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
|
||
finfo->internal_syms,
|
||
finfo->external_syms,
|
||
finfo->locsym_shndx);
|
||
if (isymbuf == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
/* Find local symbol sections and adjust values of symbols in
|
||
SEC_MERGE sections. Write out those local symbols we know are
|
||
going into the output file. */
|
||
isymend = isymbuf + locsymcount;
|
||
for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections;
|
||
isym < isymend;
|
||
isym++, pindex++, ppsection++)
|
||
{
|
||
asection *isec;
|
||
const char *name;
|
||
Elf_Internal_Sym osym;
|
||
|
||
*pindex = -1;
|
||
|
||
if (elf_bad_symtab (input_bfd))
|
||
{
|
||
if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
|
||
{
|
||
*ppsection = NULL;
|
||
continue;
|
||
}
|
||
}
|
||
|
||
if (isym->st_shndx == SHN_UNDEF)
|
||
isec = bfd_und_section_ptr;
|
||
else if (isym->st_shndx < SHN_LORESERVE
|
||
|| isym->st_shndx > SHN_HIRESERVE)
|
||
{
|
||
isec = section_from_elf_index (input_bfd, isym->st_shndx);
|
||
if (isec
|
||
&& isec->sec_info_type == ELF_INFO_TYPE_MERGE
|
||
&& ELF_ST_TYPE (isym->st_info) != STT_SECTION)
|
||
isym->st_value =
|
||
_bfd_merged_section_offset (output_bfd, &isec,
|
||
elf_section_data (isec)->sec_info,
|
||
isym->st_value, 0);
|
||
}
|
||
else if (isym->st_shndx == SHN_ABS)
|
||
isec = bfd_abs_section_ptr;
|
||
else if (isym->st_shndx == SHN_COMMON)
|
||
isec = bfd_com_section_ptr;
|
||
else
|
||
{
|
||
/* Who knows? */
|
||
isec = NULL;
|
||
}
|
||
|
||
*ppsection = isec;
|
||
|
||
/* Don't output the first, undefined, symbol. */
|
||
if (ppsection == finfo->sections)
|
||
continue;
|
||
|
||
if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
|
||
{
|
||
/* We never output section symbols. Instead, we use the
|
||
section symbol of the corresponding section in the output
|
||
file. */
|
||
continue;
|
||
}
|
||
|
||
/* If we are stripping all symbols, we don't want to output this
|
||
one. */
|
||
if (finfo->info->strip == strip_all)
|
||
continue;
|
||
|
||
/* If we are discarding all local symbols, we don't want to
|
||
output this one. If we are generating a relocatable output
|
||
file, then some of the local symbols may be required by
|
||
relocs; we output them below as we discover that they are
|
||
needed. */
|
||
if (finfo->info->discard == discard_all)
|
||
continue;
|
||
|
||
/* If this symbol is defined in a section which we are
|
||
discarding, we don't need to keep it, but note that
|
||
linker_mark is only reliable for sections that have contents.
|
||
For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
|
||
as well as linker_mark. */
|
||
if ((isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
|
||
&& isec != NULL
|
||
&& ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
|
||
|| (! finfo->info->relocatable
|
||
&& (isec->flags & SEC_EXCLUDE) != 0)))
|
||
continue;
|
||
|
||
/* Get the name of the symbol. */
|
||
name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
|
||
isym->st_name);
|
||
if (name == NULL)
|
||
return FALSE;
|
||
|
||
/* See if we are discarding symbols with this name. */
|
||
if ((finfo->info->strip == strip_some
|
||
&& (bfd_hash_lookup (finfo->info->keep_hash, name, FALSE, FALSE)
|
||
== NULL))
|
||
|| (((finfo->info->discard == discard_sec_merge
|
||
&& (isec->flags & SEC_MERGE) && ! finfo->info->relocatable)
|
||
|| finfo->info->discard == discard_l)
|
||
&& bfd_is_local_label_name (input_bfd, name)))
|
||
continue;
|
||
|
||
/* If we get here, we are going to output this symbol. */
|
||
|
||
osym = *isym;
|
||
|
||
/* Adjust the section index for the output file. */
|
||
osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
|
||
isec->output_section);
|
||
if (osym.st_shndx == SHN_BAD)
|
||
return FALSE;
|
||
|
||
*pindex = bfd_get_symcount (output_bfd);
|
||
|
||
/* ELF symbols in relocatable files are section relative, but
|
||
in executable files they are virtual addresses. Note that
|
||
this code assumes that all ELF sections have an associated
|
||
BFD section with a reasonable value for output_offset; below
|
||
we assume that they also have a reasonable value for
|
||
output_section. Any special sections must be set up to meet
|
||
these requirements. */
|
||
osym.st_value += isec->output_offset;
|
||
if (! finfo->info->relocatable)
|
||
{
|
||
osym.st_value += isec->output_section->vma;
|
||
if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
|
||
{
|
||
/* STT_TLS symbols are relative to PT_TLS segment base. */
|
||
BFD_ASSERT (finfo->first_tls_sec != NULL);
|
||
osym.st_value -= finfo->first_tls_sec->vma;
|
||
}
|
||
}
|
||
|
||
if (! elf_link_output_sym (finfo, name, &osym, isec))
|
||
return FALSE;
|
||
}
|
||
|
||
/* Relocate the contents of each section. */
|
||
sym_hashes = elf_sym_hashes (input_bfd);
|
||
for (o = input_bfd->sections; o != NULL; o = o->next)
|
||
{
|
||
bfd_byte *contents;
|
||
|
||
if (! o->linker_mark)
|
||
{
|
||
/* This section was omitted from the link. */
|
||
continue;
|
||
}
|
||
|
||
if ((o->flags & SEC_HAS_CONTENTS) == 0
|
||
|| (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
|
||
continue;
|
||
|
||
if ((o->flags & SEC_LINKER_CREATED) != 0)
|
||
{
|
||
/* Section was created by _bfd_elf_link_create_dynamic_sections
|
||
or somesuch. */
|
||
continue;
|
||
}
|
||
|
||
/* Get the contents of the section. They have been cached by a
|
||
relaxation routine. Note that o is a section in an input
|
||
file, so the contents field will not have been set by any of
|
||
the routines which work on output files. */
|
||
if (elf_section_data (o)->this_hdr.contents != NULL)
|
||
contents = elf_section_data (o)->this_hdr.contents;
|
||
else
|
||
{
|
||
contents = finfo->contents;
|
||
if (! bfd_get_section_contents (input_bfd, o, contents, 0,
|
||
o->_raw_size))
|
||
return FALSE;
|
||
}
|
||
|
||
if ((o->flags & SEC_RELOC) != 0)
|
||
{
|
||
Elf_Internal_Rela *internal_relocs;
|
||
|
||
/* Get the swapped relocs. */
|
||
internal_relocs
|
||
= _bfd_elf_link_read_relocs (input_bfd, o, finfo->external_relocs,
|
||
finfo->internal_relocs, FALSE);
|
||
if (internal_relocs == NULL
|
||
&& o->reloc_count > 0)
|
||
return FALSE;
|
||
|
||
/* Run through the relocs looking for any against symbols
|
||
from discarded sections and section symbols from
|
||
removed link-once sections. Complain about relocs
|
||
against discarded sections. Zero relocs against removed
|
||
link-once sections. Preserve debug information as much
|
||
as we can. */
|
||
if (!elf_section_ignore_discarded_relocs (o))
|
||
{
|
||
Elf_Internal_Rela *rel, *relend;
|
||
|
||
rel = internal_relocs;
|
||
relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
|
||
for ( ; rel < relend; rel++)
|
||
{
|
||
unsigned long r_symndx = ELF_R_SYM (rel->r_info);
|
||
asection *sec;
|
||
|
||
if (r_symndx >= locsymcount
|
||
|| (elf_bad_symtab (input_bfd)
|
||
&& finfo->sections[r_symndx] == NULL))
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = sym_hashes[r_symndx - extsymoff];
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* Complain if the definition comes from a
|
||
discarded section. */
|
||
sec = h->root.u.def.section;
|
||
if ((h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& elf_discarded_section (sec))
|
||
{
|
||
if ((o->flags & SEC_DEBUGGING) != 0)
|
||
{
|
||
BFD_ASSERT (r_symndx != 0);
|
||
/* Try to preserve debug information. */
|
||
if ((o->flags & SEC_DEBUGGING) != 0
|
||
&& sec->kept_section != NULL
|
||
&& sec->_raw_size == sec->kept_section->_raw_size)
|
||
h->root.u.def.section
|
||
= sec->kept_section;
|
||
else
|
||
memset (rel, 0, sizeof (*rel));
|
||
}
|
||
else
|
||
finfo->info->callbacks->error_handler
|
||
(LD_DEFINITION_IN_DISCARDED_SECTION,
|
||
_("%T: discarded in section `%s' from %s\n"),
|
||
h->root.root.string,
|
||
h->root.root.string,
|
||
h->root.u.def.section->name,
|
||
bfd_archive_filename (h->root.u.def.section->owner));
|
||
}
|
||
}
|
||
else
|
||
{
|
||
sec = finfo->sections[r_symndx];
|
||
|
||
if (sec != NULL && elf_discarded_section (sec))
|
||
{
|
||
if ((o->flags & SEC_DEBUGGING) != 0
|
||
|| (sec->flags & SEC_LINK_ONCE) != 0)
|
||
{
|
||
BFD_ASSERT (r_symndx != 0);
|
||
/* Try to preserve debug information. */
|
||
if ((o->flags & SEC_DEBUGGING) != 0
|
||
&& sec->kept_section != NULL
|
||
&& sec->_raw_size == sec->kept_section->_raw_size)
|
||
finfo->sections[r_symndx]
|
||
= sec->kept_section;
|
||
else
|
||
{
|
||
rel->r_info
|
||
= ELF_R_INFO (0, ELF_R_TYPE (rel->r_info));
|
||
rel->r_addend = 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
static int count;
|
||
int ok;
|
||
char *buf;
|
||
|
||
ok = asprintf (&buf, "local symbol %d",
|
||
count++);
|
||
if (ok <= 0)
|
||
buf = (char *) "local symbol";
|
||
finfo->info->callbacks->error_handler
|
||
(LD_DEFINITION_IN_DISCARDED_SECTION,
|
||
_("%T: discarded in section `%s' from %s\n"),
|
||
buf, buf, sec->name,
|
||
bfd_archive_filename (input_bfd));
|
||
if (ok != -1)
|
||
free (buf);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Relocate the section by invoking a back end routine.
|
||
|
||
The back end routine is responsible for adjusting the
|
||
section contents as necessary, and (if using Rela relocs
|
||
and generating a relocatable output file) adjusting the
|
||
reloc addend as necessary.
|
||
|
||
The back end routine does not have to worry about setting
|
||
the reloc address or the reloc symbol index.
|
||
|
||
The back end routine is given a pointer to the swapped in
|
||
internal symbols, and can access the hash table entries
|
||
for the external symbols via elf_sym_hashes (input_bfd).
|
||
|
||
When generating relocatable output, the back end routine
|
||
must handle STB_LOCAL/STT_SECTION symbols specially. The
|
||
output symbol is going to be a section symbol
|
||
corresponding to the output section, which will require
|
||
the addend to be adjusted. */
|
||
|
||
if (! (*relocate_section) (output_bfd, finfo->info,
|
||
input_bfd, o, contents,
|
||
internal_relocs,
|
||
isymbuf,
|
||
finfo->sections))
|
||
return FALSE;
|
||
|
||
if (emit_relocs)
|
||
{
|
||
Elf_Internal_Rela *irela;
|
||
Elf_Internal_Rela *irelaend;
|
||
bfd_vma last_offset;
|
||
struct elf_link_hash_entry **rel_hash;
|
||
Elf_Internal_Shdr *input_rel_hdr, *input_rel_hdr2;
|
||
unsigned int next_erel;
|
||
bfd_boolean (*reloc_emitter)
|
||
(bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *);
|
||
bfd_boolean rela_normal;
|
||
|
||
input_rel_hdr = &elf_section_data (o)->rel_hdr;
|
||
rela_normal = (bed->rela_normal
|
||
&& (input_rel_hdr->sh_entsize
|
||
== sizeof (Elf_External_Rela)));
|
||
|
||
/* Adjust the reloc addresses and symbol indices. */
|
||
|
||
irela = internal_relocs;
|
||
irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
|
||
rel_hash = (elf_section_data (o->output_section)->rel_hashes
|
||
+ elf_section_data (o->output_section)->rel_count
|
||
+ elf_section_data (o->output_section)->rel_count2);
|
||
last_offset = o->output_offset;
|
||
if (!finfo->info->relocatable)
|
||
last_offset += o->output_section->vma;
|
||
for (next_erel = 0; irela < irelaend; irela++, next_erel++)
|
||
{
|
||
unsigned long r_symndx;
|
||
asection *sec;
|
||
Elf_Internal_Sym sym;
|
||
|
||
if (next_erel == bed->s->int_rels_per_ext_rel)
|
||
{
|
||
rel_hash++;
|
||
next_erel = 0;
|
||
}
|
||
|
||
irela->r_offset = _bfd_elf_section_offset (output_bfd,
|
||
finfo->info, o,
|
||
irela->r_offset);
|
||
if (irela->r_offset >= (bfd_vma) -2)
|
||
{
|
||
/* This is a reloc for a deleted entry or somesuch.
|
||
Turn it into an R_*_NONE reloc, at the same
|
||
offset as the last reloc. elf_eh_frame.c and
|
||
elf_bfd_discard_info rely on reloc offsets
|
||
being ordered. */
|
||
irela->r_offset = last_offset;
|
||
irela->r_info = 0;
|
||
irela->r_addend = 0;
|
||
continue;
|
||
}
|
||
|
||
irela->r_offset += o->output_offset;
|
||
|
||
/* Relocs in an executable have to be virtual addresses. */
|
||
if (!finfo->info->relocatable)
|
||
irela->r_offset += o->output_section->vma;
|
||
|
||
last_offset = irela->r_offset;
|
||
|
||
r_symndx = ELF_R_SYM (irela->r_info);
|
||
if (r_symndx == STN_UNDEF)
|
||
continue;
|
||
|
||
if (r_symndx >= locsymcount
|
||
|| (elf_bad_symtab (input_bfd)
|
||
&& finfo->sections[r_symndx] == NULL))
|
||
{
|
||
struct elf_link_hash_entry *rh;
|
||
unsigned long indx;
|
||
|
||
/* This is a reloc against a global symbol. We
|
||
have not yet output all the local symbols, so
|
||
we do not know the symbol index of any global
|
||
symbol. We set the rel_hash entry for this
|
||
reloc to point to the global hash table entry
|
||
for this symbol. The symbol index is then
|
||
set at the end of elf_bfd_final_link. */
|
||
indx = r_symndx - extsymoff;
|
||
rh = elf_sym_hashes (input_bfd)[indx];
|
||
while (rh->root.type == bfd_link_hash_indirect
|
||
|| rh->root.type == bfd_link_hash_warning)
|
||
rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
|
||
|
||
/* Setting the index to -2 tells
|
||
elf_link_output_extsym that this symbol is
|
||
used by a reloc. */
|
||
BFD_ASSERT (rh->indx < 0);
|
||
rh->indx = -2;
|
||
|
||
*rel_hash = rh;
|
||
|
||
continue;
|
||
}
|
||
|
||
/* This is a reloc against a local symbol. */
|
||
|
||
*rel_hash = NULL;
|
||
sym = isymbuf[r_symndx];
|
||
sec = finfo->sections[r_symndx];
|
||
if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
|
||
{
|
||
/* I suppose the backend ought to fill in the
|
||
section of any STT_SECTION symbol against a
|
||
processor specific section. If we have
|
||
discarded a section, the output_section will
|
||
be the absolute section. */
|
||
if (bfd_is_abs_section (sec)
|
||
|| (sec != NULL
|
||
&& bfd_is_abs_section (sec->output_section)))
|
||
r_symndx = 0;
|
||
else if (sec == NULL || sec->owner == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
else
|
||
{
|
||
r_symndx = sec->output_section->target_index;
|
||
BFD_ASSERT (r_symndx != 0);
|
||
}
|
||
|
||
/* Adjust the addend according to where the
|
||
section winds up in the output section. */
|
||
if (rela_normal)
|
||
irela->r_addend += sec->output_offset;
|
||
}
|
||
else
|
||
{
|
||
if (finfo->indices[r_symndx] == -1)
|
||
{
|
||
unsigned long shlink;
|
||
const char *name;
|
||
asection *osec;
|
||
|
||
if (finfo->info->strip == strip_all)
|
||
{
|
||
/* You can't do ld -r -s. */
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return FALSE;
|
||
}
|
||
|
||
/* This symbol was skipped earlier, but
|
||
since it is needed by a reloc, we
|
||
must output it now. */
|
||
shlink = symtab_hdr->sh_link;
|
||
name = (bfd_elf_string_from_elf_section
|
||
(input_bfd, shlink, sym.st_name));
|
||
if (name == NULL)
|
||
return FALSE;
|
||
|
||
osec = sec->output_section;
|
||
sym.st_shndx =
|
||
_bfd_elf_section_from_bfd_section (output_bfd,
|
||
osec);
|
||
if (sym.st_shndx == SHN_BAD)
|
||
return FALSE;
|
||
|
||
sym.st_value += sec->output_offset;
|
||
if (! finfo->info->relocatable)
|
||
{
|
||
sym.st_value += osec->vma;
|
||
if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
|
||
{
|
||
/* STT_TLS symbols are relative to PT_TLS
|
||
segment base. */
|
||
BFD_ASSERT (finfo->first_tls_sec != NULL);
|
||
sym.st_value -= finfo->first_tls_sec->vma;
|
||
}
|
||
}
|
||
|
||
finfo->indices[r_symndx]
|
||
= bfd_get_symcount (output_bfd);
|
||
|
||
if (! elf_link_output_sym (finfo, name, &sym, sec))
|
||
return FALSE;
|
||
}
|
||
|
||
r_symndx = finfo->indices[r_symndx];
|
||
}
|
||
|
||
irela->r_info = ELF_R_INFO (r_symndx,
|
||
ELF_R_TYPE (irela->r_info));
|
||
}
|
||
|
||
/* Swap out the relocs. */
|
||
if (bed->elf_backend_emit_relocs
|
||
&& !(finfo->info->relocatable
|
||
|| finfo->info->emitrelocations))
|
||
reloc_emitter = bed->elf_backend_emit_relocs;
|
||
else
|
||
reloc_emitter = _bfd_elf_link_output_relocs;
|
||
|
||
if (input_rel_hdr->sh_size != 0
|
||
&& ! (*reloc_emitter) (output_bfd, o, input_rel_hdr,
|
||
internal_relocs))
|
||
return FALSE;
|
||
|
||
input_rel_hdr2 = elf_section_data (o)->rel_hdr2;
|
||
if (input_rel_hdr2 && input_rel_hdr2->sh_size != 0)
|
||
{
|
||
internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
|
||
* bed->s->int_rels_per_ext_rel);
|
||
if (! (*reloc_emitter) (output_bfd, o, input_rel_hdr2,
|
||
internal_relocs))
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Write out the modified section contents. */
|
||
if (bed->elf_backend_write_section
|
||
&& (*bed->elf_backend_write_section) (output_bfd, o, contents))
|
||
{
|
||
/* Section written out. */
|
||
}
|
||
else switch (o->sec_info_type)
|
||
{
|
||
case ELF_INFO_TYPE_STABS:
|
||
if (! (_bfd_write_section_stabs
|
||
(output_bfd,
|
||
&elf_hash_table (finfo->info)->stab_info,
|
||
o, &elf_section_data (o)->sec_info, contents)))
|
||
return FALSE;
|
||
break;
|
||
case ELF_INFO_TYPE_MERGE:
|
||
if (! _bfd_write_merged_section (output_bfd, o,
|
||
elf_section_data (o)->sec_info))
|
||
return FALSE;
|
||
break;
|
||
case ELF_INFO_TYPE_EH_FRAME:
|
||
{
|
||
if (! _bfd_elf_write_section_eh_frame (output_bfd, finfo->info,
|
||
o, contents))
|
||
return FALSE;
|
||
}
|
||
break;
|
||
default:
|
||
{
|
||
bfd_size_type sec_size;
|
||
|
||
sec_size = (o->_cooked_size != 0 ? o->_cooked_size : o->_raw_size);
|
||
if (! (o->flags & SEC_EXCLUDE)
|
||
&& ! bfd_set_section_contents (output_bfd, o->output_section,
|
||
contents,
|
||
(file_ptr) o->output_offset,
|
||
sec_size))
|
||
return FALSE;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Generate a reloc when linking an ELF file. This is a reloc
|
||
requested by the linker, and does come from any input file. This
|
||
is used to build constructor and destructor tables when linking
|
||
with -Ur. */
|
||
|
||
static bfd_boolean
|
||
elf_reloc_link_order (bfd *output_bfd,
|
||
struct bfd_link_info *info,
|
||
asection *output_section,
|
||
struct bfd_link_order *link_order)
|
||
{
|
||
reloc_howto_type *howto;
|
||
long indx;
|
||
bfd_vma offset;
|
||
bfd_vma addend;
|
||
struct elf_link_hash_entry **rel_hash_ptr;
|
||
Elf_Internal_Shdr *rel_hdr;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
|
||
Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
|
||
bfd_byte *erel;
|
||
unsigned int i;
|
||
|
||
howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
|
||
if (howto == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
|
||
addend = link_order->u.reloc.p->addend;
|
||
|
||
/* Figure out the symbol index. */
|
||
rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
|
||
+ elf_section_data (output_section)->rel_count
|
||
+ elf_section_data (output_section)->rel_count2);
|
||
if (link_order->type == bfd_section_reloc_link_order)
|
||
{
|
||
indx = link_order->u.reloc.p->u.section->target_index;
|
||
BFD_ASSERT (indx != 0);
|
||
*rel_hash_ptr = NULL;
|
||
}
|
||
else
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
/* Treat a reloc against a defined symbol as though it were
|
||
actually against the section. */
|
||
h = ((struct elf_link_hash_entry *)
|
||
bfd_wrapped_link_hash_lookup (output_bfd, info,
|
||
link_order->u.reloc.p->u.name,
|
||
FALSE, FALSE, TRUE));
|
||
if (h != NULL
|
||
&& (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak))
|
||
{
|
||
asection *section;
|
||
|
||
section = h->root.u.def.section;
|
||
indx = section->output_section->target_index;
|
||
*rel_hash_ptr = NULL;
|
||
/* It seems that we ought to add the symbol value to the
|
||
addend here, but in practice it has already been added
|
||
because it was passed to constructor_callback. */
|
||
addend += section->output_section->vma + section->output_offset;
|
||
}
|
||
else if (h != NULL)
|
||
{
|
||
/* Setting the index to -2 tells elf_link_output_extsym that
|
||
this symbol is used by a reloc. */
|
||
h->indx = -2;
|
||
*rel_hash_ptr = h;
|
||
indx = 0;
|
||
}
|
||
else
|
||
{
|
||
if (! ((*info->callbacks->unattached_reloc)
|
||
(info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
|
||
return FALSE;
|
||
indx = 0;
|
||
}
|
||
}
|
||
|
||
/* If this is an inplace reloc, we must write the addend into the
|
||
object file. */
|
||
if (howto->partial_inplace && addend != 0)
|
||
{
|
||
bfd_size_type size;
|
||
bfd_reloc_status_type rstat;
|
||
bfd_byte *buf;
|
||
bfd_boolean ok;
|
||
const char *sym_name;
|
||
|
||
size = bfd_get_reloc_size (howto);
|
||
buf = bfd_zmalloc (size);
|
||
if (buf == NULL)
|
||
return FALSE;
|
||
rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
|
||
switch (rstat)
|
||
{
|
||
case bfd_reloc_ok:
|
||
break;
|
||
|
||
default:
|
||
case bfd_reloc_outofrange:
|
||
abort ();
|
||
|
||
case bfd_reloc_overflow:
|
||
if (link_order->type == bfd_section_reloc_link_order)
|
||
sym_name = bfd_section_name (output_bfd,
|
||
link_order->u.reloc.p->u.section);
|
||
else
|
||
sym_name = link_order->u.reloc.p->u.name;
|
||
if (! ((*info->callbacks->reloc_overflow)
|
||
(info, sym_name, howto->name, addend, NULL, NULL, 0)))
|
||
{
|
||
free (buf);
|
||
return FALSE;
|
||
}
|
||
break;
|
||
}
|
||
ok = bfd_set_section_contents (output_bfd, output_section, buf,
|
||
link_order->offset, size);
|
||
free (buf);
|
||
if (! ok)
|
||
return FALSE;
|
||
}
|
||
|
||
/* The address of a reloc is relative to the section in a
|
||
relocatable file, and is a virtual address in an executable
|
||
file. */
|
||
offset = link_order->offset;
|
||
if (! info->relocatable)
|
||
offset += output_section->vma;
|
||
|
||
for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
|
||
{
|
||
irel[i].r_offset = offset;
|
||
irel[i].r_info = 0;
|
||
irel[i].r_addend = 0;
|
||
}
|
||
irel[0].r_info = ELF_R_INFO (indx, howto->type);
|
||
|
||
rel_hdr = &elf_section_data (output_section)->rel_hdr;
|
||
erel = rel_hdr->contents;
|
||
if (rel_hdr->sh_type == SHT_REL)
|
||
{
|
||
erel += (elf_section_data (output_section)->rel_count
|
||
* sizeof (Elf_External_Rel));
|
||
(*bed->s->swap_reloc_out) (output_bfd, irel, erel);
|
||
}
|
||
else
|
||
{
|
||
irel[0].r_addend = addend;
|
||
erel += (elf_section_data (output_section)->rel_count
|
||
* sizeof (Elf_External_Rela));
|
||
(*bed->s->swap_reloca_out) (output_bfd, irel, erel);
|
||
}
|
||
|
||
++elf_section_data (output_section)->rel_count;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Garbage collect unused sections. */
|
||
|
||
static bfd_boolean elf_gc_sweep_symbol
|
||
(struct elf_link_hash_entry *, void *);
|
||
|
||
static bfd_boolean elf_gc_allocate_got_offsets
|
||
(struct elf_link_hash_entry *, void *);
|
||
|
||
/* The mark phase of garbage collection. For a given section, mark
|
||
it and any sections in this section's group, and all the sections
|
||
which define symbols to which it refers. */
|
||
|
||
typedef asection * (*gc_mark_hook_fn)
|
||
(asection *, struct bfd_link_info *, Elf_Internal_Rela *,
|
||
struct elf_link_hash_entry *, Elf_Internal_Sym *);
|
||
|
||
static bfd_boolean
|
||
elf_gc_mark (struct bfd_link_info *info,
|
||
asection *sec,
|
||
gc_mark_hook_fn gc_mark_hook)
|
||
{
|
||
bfd_boolean ret;
|
||
asection *group_sec;
|
||
|
||
sec->gc_mark = 1;
|
||
|
||
/* Mark all the sections in the group. */
|
||
group_sec = elf_section_data (sec)->next_in_group;
|
||
if (group_sec && !group_sec->gc_mark)
|
||
if (!elf_gc_mark (info, group_sec, gc_mark_hook))
|
||
return FALSE;
|
||
|
||
/* Look through the section relocs. */
|
||
ret = TRUE;
|
||
if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
|
||
{
|
||
Elf_Internal_Rela *relstart, *rel, *relend;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
size_t nlocsyms;
|
||
size_t extsymoff;
|
||
bfd *input_bfd = sec->owner;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
|
||
Elf_Internal_Sym *isym = NULL;
|
||
|
||
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (input_bfd);
|
||
|
||
/* Read the local symbols. */
|
||
if (elf_bad_symtab (input_bfd))
|
||
{
|
||
nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
|
||
extsymoff = 0;
|
||
}
|
||
else
|
||
extsymoff = nlocsyms = symtab_hdr->sh_info;
|
||
|
||
isym = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
if (isym == NULL && nlocsyms != 0)
|
||
{
|
||
isym = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, nlocsyms, 0,
|
||
NULL, NULL, NULL);
|
||
if (isym == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
/* Read the relocations. */
|
||
relstart = _bfd_elf_link_read_relocs (input_bfd, sec, NULL, NULL,
|
||
info->keep_memory);
|
||
if (relstart == NULL)
|
||
{
|
||
ret = FALSE;
|
||
goto out1;
|
||
}
|
||
relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
|
||
|
||
for (rel = relstart; rel < relend; rel++)
|
||
{
|
||
unsigned long r_symndx;
|
||
asection *rsec;
|
||
struct elf_link_hash_entry *h;
|
||
|
||
r_symndx = ELF_R_SYM (rel->r_info);
|
||
if (r_symndx == 0)
|
||
continue;
|
||
|
||
if (r_symndx >= nlocsyms
|
||
|| ELF_ST_BIND (isym[r_symndx].st_info) != STB_LOCAL)
|
||
{
|
||
h = sym_hashes[r_symndx - extsymoff];
|
||
rsec = (*gc_mark_hook) (sec, info, rel, h, NULL);
|
||
}
|
||
else
|
||
{
|
||
rsec = (*gc_mark_hook) (sec, info, rel, NULL, &isym[r_symndx]);
|
||
}
|
||
|
||
if (rsec && !rsec->gc_mark)
|
||
{
|
||
if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
|
||
rsec->gc_mark = 1;
|
||
else if (!elf_gc_mark (info, rsec, gc_mark_hook))
|
||
{
|
||
ret = FALSE;
|
||
goto out2;
|
||
}
|
||
}
|
||
}
|
||
|
||
out2:
|
||
if (elf_section_data (sec)->relocs != relstart)
|
||
free (relstart);
|
||
out1:
|
||
if (isym != NULL && symtab_hdr->contents != (unsigned char *) isym)
|
||
{
|
||
if (! info->keep_memory)
|
||
free (isym);
|
||
else
|
||
symtab_hdr->contents = (unsigned char *) isym;
|
||
}
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* The sweep phase of garbage collection. Remove all garbage sections. */
|
||
|
||
typedef bfd_boolean (*gc_sweep_hook_fn)
|
||
(bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
|
||
|
||
static bfd_boolean
|
||
elf_gc_sweep (struct bfd_link_info *info, gc_sweep_hook_fn gc_sweep_hook)
|
||
{
|
||
bfd *sub;
|
||
|
||
for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
|
||
{
|
||
asection *o;
|
||
|
||
if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
for (o = sub->sections; o != NULL; o = o->next)
|
||
{
|
||
/* Keep special sections. Keep .debug sections. */
|
||
if ((o->flags & SEC_LINKER_CREATED)
|
||
|| (o->flags & SEC_DEBUGGING))
|
||
o->gc_mark = 1;
|
||
|
||
if (o->gc_mark)
|
||
continue;
|
||
|
||
/* Skip sweeping sections already excluded. */
|
||
if (o->flags & SEC_EXCLUDE)
|
||
continue;
|
||
|
||
/* Since this is early in the link process, it is simple
|
||
to remove a section from the output. */
|
||
o->flags |= SEC_EXCLUDE;
|
||
|
||
/* But we also have to update some of the relocation
|
||
info we collected before. */
|
||
if (gc_sweep_hook
|
||
&& (o->flags & SEC_RELOC) && o->reloc_count > 0)
|
||
{
|
||
Elf_Internal_Rela *internal_relocs;
|
||
bfd_boolean r;
|
||
|
||
internal_relocs
|
||
= _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
|
||
info->keep_memory);
|
||
if (internal_relocs == NULL)
|
||
return FALSE;
|
||
|
||
r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
|
||
|
||
if (elf_section_data (o)->relocs != internal_relocs)
|
||
free (internal_relocs);
|
||
|
||
if (!r)
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Remove the symbols that were in the swept sections from the dynamic
|
||
symbol table. GCFIXME: Anyone know how to get them out of the
|
||
static symbol table as well? */
|
||
{
|
||
int i = 0;
|
||
|
||
elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol, &i);
|
||
|
||
elf_hash_table (info)->dynsymcount = i;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
|
||
|
||
static bfd_boolean
|
||
elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *idxptr)
|
||
{
|
||
int *idx = idxptr;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
if (h->dynindx != -1
|
||
&& ((h->root.type != bfd_link_hash_defined
|
||
&& h->root.type != bfd_link_hash_defweak)
|
||
|| h->root.u.def.section->gc_mark))
|
||
h->dynindx = (*idx)++;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Propogate collected vtable information. This is called through
|
||
elf_link_hash_traverse. */
|
||
|
||
static bfd_boolean
|
||
elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
|
||
{
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* Those that are not vtables. */
|
||
if (h->vtable_parent == NULL)
|
||
return TRUE;
|
||
|
||
/* Those vtables that do not have parents, we cannot merge. */
|
||
if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
|
||
return TRUE;
|
||
|
||
/* If we've already been done, exit. */
|
||
if (h->vtable_entries_used && h->vtable_entries_used[-1])
|
||
return TRUE;
|
||
|
||
/* Make sure the parent's table is up to date. */
|
||
elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
|
||
|
||
if (h->vtable_entries_used == NULL)
|
||
{
|
||
/* None of this table's entries were referenced. Re-use the
|
||
parent's table. */
|
||
h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
|
||
h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
|
||
}
|
||
else
|
||
{
|
||
size_t n;
|
||
bfd_boolean *cu, *pu;
|
||
|
||
/* Or the parent's entries into ours. */
|
||
cu = h->vtable_entries_used;
|
||
cu[-1] = TRUE;
|
||
pu = h->vtable_parent->vtable_entries_used;
|
||
if (pu != NULL)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
unsigned int log_file_align;
|
||
|
||
bed = get_elf_backend_data (h->root.u.def.section->owner);
|
||
log_file_align = bed->s->log_file_align;
|
||
n = h->vtable_parent->vtable_entries_size >> log_file_align;
|
||
while (n--)
|
||
{
|
||
if (*pu)
|
||
*cu = TRUE;
|
||
pu++;
|
||
cu++;
|
||
}
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static bfd_boolean
|
||
elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
|
||
{
|
||
asection *sec;
|
||
bfd_vma hstart, hend;
|
||
Elf_Internal_Rela *relstart, *relend, *rel;
|
||
const struct elf_backend_data *bed;
|
||
unsigned int log_file_align;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* Take care of both those symbols that do not describe vtables as
|
||
well as those that are not loaded. */
|
||
if (h->vtable_parent == NULL)
|
||
return TRUE;
|
||
|
||
BFD_ASSERT (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak);
|
||
|
||
sec = h->root.u.def.section;
|
||
hstart = h->root.u.def.value;
|
||
hend = hstart + h->size;
|
||
|
||
relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
|
||
if (!relstart)
|
||
return *(bfd_boolean *) okp = FALSE;
|
||
bed = get_elf_backend_data (sec->owner);
|
||
log_file_align = bed->s->log_file_align;
|
||
|
||
relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
|
||
|
||
for (rel = relstart; rel < relend; ++rel)
|
||
if (rel->r_offset >= hstart && rel->r_offset < hend)
|
||
{
|
||
/* If the entry is in use, do nothing. */
|
||
if (h->vtable_entries_used
|
||
&& (rel->r_offset - hstart) < h->vtable_entries_size)
|
||
{
|
||
bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
|
||
if (h->vtable_entries_used[entry])
|
||
continue;
|
||
}
|
||
/* Otherwise, kill it. */
|
||
rel->r_offset = rel->r_info = rel->r_addend = 0;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Do mark and sweep of unused sections. */
|
||
|
||
bfd_boolean
|
||
elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
bfd_boolean ok = TRUE;
|
||
bfd *sub;
|
||
asection * (*gc_mark_hook)
|
||
(asection *, struct bfd_link_info *, Elf_Internal_Rela *,
|
||
struct elf_link_hash_entry *h, Elf_Internal_Sym *);
|
||
|
||
if (!get_elf_backend_data (abfd)->can_gc_sections
|
||
|| info->relocatable || info->emitrelocations
|
||
|| elf_hash_table (info)->dynamic_sections_created)
|
||
return TRUE;
|
||
|
||
/* Apply transitive closure to the vtable entry usage info. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_gc_propagate_vtable_entries_used,
|
||
&ok);
|
||
if (!ok)
|
||
return FALSE;
|
||
|
||
/* Kill the vtable relocations that were not used. */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_gc_smash_unused_vtentry_relocs,
|
||
&ok);
|
||
if (!ok)
|
||
return FALSE;
|
||
|
||
/* Grovel through relocs to find out who stays ... */
|
||
|
||
gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
|
||
for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
|
||
{
|
||
asection *o;
|
||
|
||
if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
for (o = sub->sections; o != NULL; o = o->next)
|
||
{
|
||
if (o->flags & SEC_KEEP)
|
||
if (!elf_gc_mark (info, o, gc_mark_hook))
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* ... and mark SEC_EXCLUDE for those that go. */
|
||
if (!elf_gc_sweep (info, get_elf_backend_data (abfd)->gc_sweep_hook))
|
||
return FALSE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Called from check_relocs to record the existance of a VTINHERIT reloc. */
|
||
|
||
bfd_boolean
|
||
elf_gc_record_vtinherit (bfd *abfd,
|
||
asection *sec,
|
||
struct elf_link_hash_entry *h,
|
||
bfd_vma offset)
|
||
{
|
||
struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
|
||
struct elf_link_hash_entry **search, *child;
|
||
bfd_size_type extsymcount;
|
||
|
||
/* The sh_info field of the symtab header tells us where the
|
||
external symbols start. We don't care about the local symbols at
|
||
this point. */
|
||
extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
|
||
if (!elf_bad_symtab (abfd))
|
||
extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
|
||
|
||
sym_hashes = elf_sym_hashes (abfd);
|
||
sym_hashes_end = sym_hashes + extsymcount;
|
||
|
||
/* Hunt down the child symbol, which is in this section at the same
|
||
offset as the relocation. */
|
||
for (search = sym_hashes; search != sym_hashes_end; ++search)
|
||
{
|
||
if ((child = *search) != NULL
|
||
&& (child->root.type == bfd_link_hash_defined
|
||
|| child->root.type == bfd_link_hash_defweak)
|
||
&& child->root.u.def.section == sec
|
||
&& child->root.u.def.value == offset)
|
||
goto win;
|
||
}
|
||
|
||
(*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
|
||
bfd_archive_filename (abfd), sec->name,
|
||
(unsigned long) offset);
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return FALSE;
|
||
|
||
win:
|
||
if (!h)
|
||
{
|
||
/* This *should* only be the absolute section. It could potentially
|
||
be that someone has defined a non-global vtable though, which
|
||
would be bad. It isn't worth paging in the local symbols to be
|
||
sure though; that case should simply be handled by the assembler. */
|
||
|
||
child->vtable_parent = (struct elf_link_hash_entry *) -1;
|
||
}
|
||
else
|
||
child->vtable_parent = h;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Called from check_relocs to record the existance of a VTENTRY reloc. */
|
||
|
||
bfd_boolean
|
||
elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
|
||
asection *sec ATTRIBUTE_UNUSED,
|
||
struct elf_link_hash_entry *h,
|
||
bfd_vma addend)
|
||
{
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
unsigned int log_file_align = bed->s->log_file_align;
|
||
|
||
if (addend >= h->vtable_entries_size)
|
||
{
|
||
size_t size, bytes, file_align;
|
||
bfd_boolean *ptr = h->vtable_entries_used;
|
||
|
||
/* While the symbol is undefined, we have to be prepared to handle
|
||
a zero size. */
|
||
file_align = 1 << log_file_align;
|
||
if (h->root.type == bfd_link_hash_undefined)
|
||
size = addend + file_align;
|
||
else
|
||
{
|
||
size = h->size;
|
||
if (addend >= size)
|
||
{
|
||
/* Oops! We've got a reference past the defined end of
|
||
the table. This is probably a bug -- shall we warn? */
|
||
size = addend + file_align;
|
||
}
|
||
}
|
||
size = (size + file_align - 1) & -file_align;
|
||
|
||
/* Allocate one extra entry for use as a "done" flag for the
|
||
consolidation pass. */
|
||
bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
|
||
|
||
if (ptr)
|
||
{
|
||
ptr = bfd_realloc (ptr - 1, bytes);
|
||
|
||
if (ptr != NULL)
|
||
{
|
||
size_t oldbytes;
|
||
|
||
oldbytes = (((h->vtable_entries_size >> log_file_align) + 1)
|
||
* sizeof (bfd_boolean));
|
||
memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
|
||
}
|
||
}
|
||
else
|
||
ptr = bfd_zmalloc (bytes);
|
||
|
||
if (ptr == NULL)
|
||
return FALSE;
|
||
|
||
/* And arrange for that done flag to be at index -1. */
|
||
h->vtable_entries_used = ptr + 1;
|
||
h->vtable_entries_size = size;
|
||
}
|
||
|
||
h->vtable_entries_used[addend >> log_file_align] = TRUE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* And an accompanying bit to work out final got entry offsets once
|
||
we're done. Should be called from final_link. */
|
||
|
||
bfd_boolean
|
||
elf_gc_common_finalize_got_offsets (bfd *abfd,
|
||
struct bfd_link_info *info)
|
||
{
|
||
bfd *i;
|
||
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
bfd_vma gotoff;
|
||
|
||
/* The GOT offset is relative to the .got section, but the GOT header is
|
||
put into the .got.plt section, if the backend uses it. */
|
||
if (bed->want_got_plt)
|
||
gotoff = 0;
|
||
else
|
||
gotoff = bed->got_header_size;
|
||
|
||
/* Do the local .got entries first. */
|
||
for (i = info->input_bfds; i; i = i->link_next)
|
||
{
|
||
bfd_signed_vma *local_got;
|
||
bfd_size_type j, locsymcount;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
|
||
if (bfd_get_flavour (i) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
local_got = elf_local_got_refcounts (i);
|
||
if (!local_got)
|
||
continue;
|
||
|
||
symtab_hdr = &elf_tdata (i)->symtab_hdr;
|
||
if (elf_bad_symtab (i))
|
||
locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
|
||
else
|
||
locsymcount = symtab_hdr->sh_info;
|
||
|
||
for (j = 0; j < locsymcount; ++j)
|
||
{
|
||
if (local_got[j] > 0)
|
||
{
|
||
local_got[j] = gotoff;
|
||
gotoff += ARCH_SIZE / 8;
|
||
}
|
||
else
|
||
local_got[j] = (bfd_vma) -1;
|
||
}
|
||
}
|
||
|
||
/* Then the global .got entries. .plt refcounts are handled by
|
||
adjust_dynamic_symbol */
|
||
elf_link_hash_traverse (elf_hash_table (info),
|
||
elf_gc_allocate_got_offsets,
|
||
&gotoff);
|
||
return TRUE;
|
||
}
|
||
|
||
/* We need a special top-level link routine to convert got reference counts
|
||
to real got offsets. */
|
||
|
||
static bfd_boolean
|
||
elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *offarg)
|
||
{
|
||
bfd_vma *off = offarg;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
if (h->got.refcount > 0)
|
||
{
|
||
h->got.offset = off[0];
|
||
off[0] += ARCH_SIZE / 8;
|
||
}
|
||
else
|
||
h->got.offset = (bfd_vma) -1;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* Many folk need no more in the way of final link than this, once
|
||
got entry reference counting is enabled. */
|
||
|
||
bfd_boolean
|
||
elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
|
||
{
|
||
if (!elf_gc_common_finalize_got_offsets (abfd, info))
|
||
return FALSE;
|
||
|
||
/* Invoke the regular ELF backend linker to do all the work. */
|
||
return elf_bfd_final_link (abfd, info);
|
||
}
|
||
|
||
/* This function will be called though elf_link_hash_traverse to store
|
||
all hash value of the exported symbols in an array. */
|
||
|
||
static bfd_boolean
|
||
elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
|
||
{
|
||
unsigned long **valuep = data;
|
||
const char *name;
|
||
char *p;
|
||
unsigned long ha;
|
||
char *alc = NULL;
|
||
|
||
if (h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
/* Ignore indirect symbols. These are added by the versioning code. */
|
||
if (h->dynindx == -1)
|
||
return TRUE;
|
||
|
||
name = h->root.root.string;
|
||
p = strchr (name, ELF_VER_CHR);
|
||
if (p != NULL)
|
||
{
|
||
alc = bfd_malloc (p - name + 1);
|
||
memcpy (alc, name, p - name);
|
||
alc[p - name] = '\0';
|
||
name = alc;
|
||
}
|
||
|
||
/* Compute the hash value. */
|
||
ha = bfd_elf_hash (name);
|
||
|
||
/* Store the found hash value in the array given as the argument. */
|
||
*(*valuep)++ = ha;
|
||
|
||
/* And store it in the struct so that we can put it in the hash table
|
||
later. */
|
||
h->elf_hash_value = ha;
|
||
|
||
if (alc != NULL)
|
||
free (alc);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
bfd_boolean
|
||
elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
|
||
{
|
||
struct elf_reloc_cookie *rcookie = cookie;
|
||
|
||
if (rcookie->bad_symtab)
|
||
rcookie->rel = rcookie->rels;
|
||
|
||
for (; rcookie->rel < rcookie->relend; rcookie->rel++)
|
||
{
|
||
unsigned long r_symndx;
|
||
|
||
if (! rcookie->bad_symtab)
|
||
if (rcookie->rel->r_offset > offset)
|
||
return FALSE;
|
||
if (rcookie->rel->r_offset != offset)
|
||
continue;
|
||
|
||
r_symndx = ELF_R_SYM (rcookie->rel->r_info);
|
||
if (r_symndx == SHN_UNDEF)
|
||
return TRUE;
|
||
|
||
if (r_symndx >= rcookie->locsymcount
|
||
|| ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
|
||
h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
|
||
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
|
||
if ((h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
&& elf_discarded_section (h->root.u.def.section))
|
||
return TRUE;
|
||
else
|
||
return FALSE;
|
||
}
|
||
else
|
||
{
|
||
/* It's not a relocation against a global symbol,
|
||
but it could be a relocation against a local
|
||
symbol for a discarded section. */
|
||
asection *isec;
|
||
Elf_Internal_Sym *isym;
|
||
|
||
/* Need to: get the symbol; get the section. */
|
||
isym = &rcookie->locsyms[r_symndx];
|
||
if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
|
||
{
|
||
isec = section_from_elf_index (rcookie->abfd, isym->st_shndx);
|
||
if (isec != NULL && elf_discarded_section (isec))
|
||
return TRUE;
|
||
}
|
||
}
|
||
return FALSE;
|
||
}
|
||
return FALSE;
|
||
}
|
||
|
||
/* Discard unneeded references to discarded sections.
|
||
Returns TRUE if any section's size was changed. */
|
||
/* This function assumes that the relocations are in sorted order,
|
||
which is true for all known assemblers. */
|
||
|
||
bfd_boolean
|
||
elf_bfd_discard_info (bfd *output_bfd, struct bfd_link_info *info)
|
||
{
|
||
struct elf_reloc_cookie cookie;
|
||
asection *stab, *eh;
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
const struct elf_backend_data *bed;
|
||
bfd *abfd;
|
||
unsigned int count;
|
||
bfd_boolean ret = FALSE;
|
||
|
||
if (info->traditional_format
|
||
|| info->hash->creator->flavour != bfd_target_elf_flavour
|
||
|| ! is_elf_hash_table (info))
|
||
return FALSE;
|
||
|
||
for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
|
||
{
|
||
if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
|
||
continue;
|
||
|
||
bed = get_elf_backend_data (abfd);
|
||
|
||
if ((abfd->flags & DYNAMIC) != 0)
|
||
continue;
|
||
|
||
eh = bfd_get_section_by_name (abfd, ".eh_frame");
|
||
if (info->relocatable
|
||
|| (eh != NULL
|
||
&& (eh->_raw_size == 0
|
||
|| bfd_is_abs_section (eh->output_section))))
|
||
eh = NULL;
|
||
|
||
stab = bfd_get_section_by_name (abfd, ".stab");
|
||
if (stab != NULL
|
||
&& (stab->_raw_size == 0
|
||
|| bfd_is_abs_section (stab->output_section)
|
||
|| stab->sec_info_type != ELF_INFO_TYPE_STABS))
|
||
stab = NULL;
|
||
|
||
if (stab == NULL
|
||
&& eh == NULL
|
||
&& bed->elf_backend_discard_info == NULL)
|
||
continue;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
cookie.abfd = abfd;
|
||
cookie.sym_hashes = elf_sym_hashes (abfd);
|
||
cookie.bad_symtab = elf_bad_symtab (abfd);
|
||
if (cookie.bad_symtab)
|
||
{
|
||
cookie.locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
|
||
cookie.extsymoff = 0;
|
||
}
|
||
else
|
||
{
|
||
cookie.locsymcount = symtab_hdr->sh_info;
|
||
cookie.extsymoff = symtab_hdr->sh_info;
|
||
}
|
||
|
||
cookie.locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
if (cookie.locsyms == NULL && cookie.locsymcount != 0)
|
||
{
|
||
cookie.locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
|
||
cookie.locsymcount, 0,
|
||
NULL, NULL, NULL);
|
||
if (cookie.locsyms == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
if (stab != NULL)
|
||
{
|
||
cookie.rels = NULL;
|
||
count = stab->reloc_count;
|
||
if (count != 0)
|
||
cookie.rels = _bfd_elf_link_read_relocs (abfd, stab, NULL, NULL,
|
||
info->keep_memory);
|
||
if (cookie.rels != NULL)
|
||
{
|
||
cookie.rel = cookie.rels;
|
||
cookie.relend = cookie.rels;
|
||
cookie.relend += count * bed->s->int_rels_per_ext_rel;
|
||
if (_bfd_discard_section_stabs (abfd, stab,
|
||
elf_section_data (stab)->sec_info,
|
||
elf_reloc_symbol_deleted_p,
|
||
&cookie))
|
||
ret = TRUE;
|
||
if (elf_section_data (stab)->relocs != cookie.rels)
|
||
free (cookie.rels);
|
||
}
|
||
}
|
||
|
||
if (eh != NULL)
|
||
{
|
||
cookie.rels = NULL;
|
||
count = eh->reloc_count;
|
||
if (count != 0)
|
||
cookie.rels = _bfd_elf_link_read_relocs (abfd, eh, NULL, NULL,
|
||
info->keep_memory);
|
||
cookie.rel = cookie.rels;
|
||
cookie.relend = cookie.rels;
|
||
if (cookie.rels != NULL)
|
||
cookie.relend += count * bed->s->int_rels_per_ext_rel;
|
||
|
||
if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
|
||
elf_reloc_symbol_deleted_p,
|
||
&cookie))
|
||
ret = TRUE;
|
||
|
||
if (cookie.rels != NULL
|
||
&& elf_section_data (eh)->relocs != cookie.rels)
|
||
free (cookie.rels);
|
||
}
|
||
|
||
if (bed->elf_backend_discard_info != NULL
|
||
&& (*bed->elf_backend_discard_info) (abfd, &cookie, info))
|
||
ret = TRUE;
|
||
|
||
if (cookie.locsyms != NULL
|
||
&& symtab_hdr->contents != (unsigned char *) cookie.locsyms)
|
||
{
|
||
if (! info->keep_memory)
|
||
free (cookie.locsyms);
|
||
else
|
||
symtab_hdr->contents = (unsigned char *) cookie.locsyms;
|
||
}
|
||
}
|
||
|
||
if (info->eh_frame_hdr
|
||
&& !info->relocatable
|
||
&& _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
|
||
ret = TRUE;
|
||
|
||
return ret;
|
||
}
|
||
|
||
static bfd_boolean
|
||
elf_section_ignore_discarded_relocs (asection *sec)
|
||
{
|
||
const struct elf_backend_data *bed;
|
||
|
||
switch (sec->sec_info_type)
|
||
{
|
||
case ELF_INFO_TYPE_STABS:
|
||
case ELF_INFO_TYPE_EH_FRAME:
|
||
return TRUE;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
bed = get_elf_backend_data (sec->owner);
|
||
if (bed->elf_backend_ignore_discarded_relocs != NULL
|
||
&& (*bed->elf_backend_ignore_discarded_relocs) (sec))
|
||
return TRUE;
|
||
|
||
return FALSE;
|
||
}
|