651 lines
18 KiB
C
651 lines
18 KiB
C
/* ELF linking support for BFD.
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Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
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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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#include "bfd.h"
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#include "sysdep.h"
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#include "bfdlink.h"
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#include "libbfd.h"
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#define ARCH_SIZE 0
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#include "elf-bfd.h"
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boolean
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_bfd_elf_create_got_section (abfd, info)
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bfd *abfd;
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struct bfd_link_info *info;
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{
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flagword flags;
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register asection *s;
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struct elf_link_hash_entry *h;
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struct bfd_link_hash_entry *bh;
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struct elf_backend_data *bed = get_elf_backend_data (abfd);
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int ptralign;
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/* This function may be called more than once. */
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if (bfd_get_section_by_name (abfd, ".got") != NULL)
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return true;
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switch (bed->s->arch_size)
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{
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case 32:
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ptralign = 2;
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break;
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case 64:
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ptralign = 3;
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break;
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default:
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bfd_set_error (bfd_error_bad_value);
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return false;
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}
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flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
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| SEC_LINKER_CREATED);
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s = bfd_make_section (abfd, ".got");
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if (s == NULL
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|| !bfd_set_section_flags (abfd, s, flags)
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|| !bfd_set_section_alignment (abfd, s, ptralign))
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return false;
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if (bed->want_got_plt)
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{
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s = bfd_make_section (abfd, ".got.plt");
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if (s == NULL
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|| !bfd_set_section_flags (abfd, s, flags)
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|| !bfd_set_section_alignment (abfd, s, ptralign))
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return false;
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}
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if (bed->want_got_sym)
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{
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/* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
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(or .got.plt) section. We don't do this in the linker script
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because we don't want to define the symbol if we are not creating
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a global offset table. */
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bh = NULL;
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if (!(_bfd_generic_link_add_one_symbol
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(info, abfd, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL, s,
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bed->got_symbol_offset, (const char *) NULL, false,
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bed->collect, &bh)))
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return false;
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h = (struct elf_link_hash_entry *) bh;
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h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
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h->type = STT_OBJECT;
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if (info->shared
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&& ! _bfd_elf_link_record_dynamic_symbol (info, h))
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return false;
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elf_hash_table (info)->hgot = h;
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}
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/* The first bit of the global offset table is the header. */
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s->_raw_size += bed->got_header_size + bed->got_symbol_offset;
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return true;
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}
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/* Create dynamic sections when linking against a dynamic object. */
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boolean
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_bfd_elf_create_dynamic_sections (abfd, info)
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bfd *abfd;
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struct bfd_link_info *info;
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{
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flagword flags, pltflags;
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register asection *s;
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struct elf_backend_data *bed = get_elf_backend_data (abfd);
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int ptralign;
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switch (bed->s->arch_size)
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{
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case 32:
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ptralign = 2;
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break;
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case 64:
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ptralign = 3;
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break;
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default:
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bfd_set_error (bfd_error_bad_value);
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return false;
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}
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/* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
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.rel[a].bss sections. */
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flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
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| SEC_LINKER_CREATED);
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pltflags = flags;
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pltflags |= SEC_CODE;
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if (bed->plt_not_loaded)
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pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
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if (bed->plt_readonly)
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pltflags |= SEC_READONLY;
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s = bfd_make_section (abfd, ".plt");
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if (s == NULL
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|| ! bfd_set_section_flags (abfd, s, pltflags)
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|| ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
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return false;
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if (bed->want_plt_sym)
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{
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/* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
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.plt section. */
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struct elf_link_hash_entry *h;
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struct bfd_link_hash_entry *bh = NULL;
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if (! (_bfd_generic_link_add_one_symbol
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(info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s,
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(bfd_vma) 0, (const char *) NULL, false,
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get_elf_backend_data (abfd)->collect, &bh)))
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return false;
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h = (struct elf_link_hash_entry *) bh;
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h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
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h->type = STT_OBJECT;
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if (info->shared
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&& ! _bfd_elf_link_record_dynamic_symbol (info, h))
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return false;
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}
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s = bfd_make_section (abfd,
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bed->default_use_rela_p ? ".rela.plt" : ".rel.plt");
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if (s == NULL
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|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
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|| ! bfd_set_section_alignment (abfd, s, ptralign))
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return false;
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if (! _bfd_elf_create_got_section (abfd, info))
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return false;
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if (bed->want_dynbss)
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{
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/* The .dynbss section is a place to put symbols which are defined
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by dynamic objects, are referenced by regular objects, and are
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not functions. We must allocate space for them in the process
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image and use a R_*_COPY reloc to tell the dynamic linker to
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initialize them at run time. The linker script puts the .dynbss
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section into the .bss section of the final image. */
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s = bfd_make_section (abfd, ".dynbss");
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if (s == NULL
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|| ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
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return false;
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/* The .rel[a].bss section holds copy relocs. This section is not
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normally needed. We need to create it here, though, so that the
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linker will map it to an output section. We can't just create it
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only if we need it, because we will not know whether we need it
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until we have seen all the input files, and the first time the
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main linker code calls BFD after examining all the input files
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(size_dynamic_sections) the input sections have already been
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mapped to the output sections. If the section turns out not to
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be needed, we can discard it later. We will never need this
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section when generating a shared object, since they do not use
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copy relocs. */
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if (! info->shared)
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{
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s = bfd_make_section (abfd,
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(bed->default_use_rela_p
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? ".rela.bss" : ".rel.bss"));
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if (s == NULL
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|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
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|| ! bfd_set_section_alignment (abfd, s, ptralign))
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return false;
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}
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}
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return true;
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}
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/* Record a new dynamic symbol. We record the dynamic symbols as we
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read the input files, since we need to have a list of all of them
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before we can determine the final sizes of the output sections.
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Note that we may actually call this function even though we are not
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going to output any dynamic symbols; in some cases we know that a
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symbol should be in the dynamic symbol table, but only if there is
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one. */
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boolean
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_bfd_elf_link_record_dynamic_symbol (info, h)
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struct bfd_link_info *info;
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struct elf_link_hash_entry *h;
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{
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if (h->dynindx == -1)
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{
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struct elf_strtab_hash *dynstr;
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char *p, *alc;
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const char *name;
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boolean copy;
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bfd_size_type indx;
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/* XXX: The ABI draft says the linker must turn hidden and
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internal symbols into STB_LOCAL symbols when producing the
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DSO. However, if ld.so honors st_other in the dynamic table,
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this would not be necessary. */
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switch (ELF_ST_VISIBILITY (h->other))
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{
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case STV_INTERNAL:
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case STV_HIDDEN:
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if (h->root.type != bfd_link_hash_undefined
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&& h->root.type != bfd_link_hash_undefweak)
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{
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h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL;
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return true;
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}
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default:
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break;
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}
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h->dynindx = elf_hash_table (info)->dynsymcount;
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++elf_hash_table (info)->dynsymcount;
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dynstr = elf_hash_table (info)->dynstr;
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if (dynstr == NULL)
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{
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/* Create a strtab to hold the dynamic symbol names. */
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elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
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if (dynstr == NULL)
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return false;
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}
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/* We don't put any version information in the dynamic string
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table. */
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name = h->root.root.string;
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p = strchr (name, ELF_VER_CHR);
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if (p == NULL)
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{
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alc = NULL;
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copy = false;
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}
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else
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{
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size_t len = p - name + 1;
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alc = bfd_malloc ((bfd_size_type) len);
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if (alc == NULL)
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return false;
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memcpy (alc, name, len - 1);
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alc[len - 1] = '\0';
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name = alc;
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copy = true;
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}
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indx = _bfd_elf_strtab_add (dynstr, name, copy);
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if (alc != NULL)
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free (alc);
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if (indx == (bfd_size_type) -1)
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return false;
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h->dynstr_index = indx;
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}
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return true;
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}
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/* Record a new local dynamic symbol. Returns 0 on failure, 1 on
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success, and 2 on a failure caused by attempting to record a symbol
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in a discarded section, eg. a discarded link-once section symbol. */
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int
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elf_link_record_local_dynamic_symbol (info, input_bfd, input_indx)
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struct bfd_link_info *info;
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bfd *input_bfd;
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long input_indx;
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{
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bfd_size_type amt;
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struct elf_link_local_dynamic_entry *entry;
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struct elf_link_hash_table *eht;
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struct elf_strtab_hash *dynstr;
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unsigned long dynstr_index;
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char *name;
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Elf_External_Sym_Shndx eshndx;
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char esym[sizeof (Elf64_External_Sym)];
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if (! is_elf_hash_table (info))
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return 0;
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/* See if the entry exists already. */
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for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
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if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
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return 1;
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amt = sizeof (*entry);
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entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
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if (entry == NULL)
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return 0;
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/* Go find the symbol, so that we can find it's name. */
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if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
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(size_t) 1, (size_t) input_indx,
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&entry->isym, esym, &eshndx))
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{
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bfd_release (input_bfd, entry);
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return 0;
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}
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if (entry->isym.st_shndx != SHN_UNDEF
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&& (entry->isym.st_shndx < SHN_LORESERVE
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|| entry->isym.st_shndx > SHN_HIRESERVE))
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{
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asection *s;
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s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
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if (s == NULL || bfd_is_abs_section (s->output_section))
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{
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/* We can still bfd_release here as nothing has done another
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bfd_alloc. We can't do this later in this function. */
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bfd_release (input_bfd, entry);
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return 2;
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}
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}
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name = (bfd_elf_string_from_elf_section
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(input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
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entry->isym.st_name));
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dynstr = elf_hash_table (info)->dynstr;
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if (dynstr == NULL)
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{
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/* Create a strtab to hold the dynamic symbol names. */
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elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
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if (dynstr == NULL)
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return 0;
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}
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dynstr_index = _bfd_elf_strtab_add (dynstr, name, false);
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if (dynstr_index == (unsigned long) -1)
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return 0;
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entry->isym.st_name = dynstr_index;
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eht = elf_hash_table (info);
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entry->next = eht->dynlocal;
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eht->dynlocal = entry;
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entry->input_bfd = input_bfd;
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entry->input_indx = input_indx;
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eht->dynsymcount++;
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/* Whatever binding the symbol had before, it's now local. */
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entry->isym.st_info
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= ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
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/* The dynindx will be set at the end of size_dynamic_sections. */
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return 1;
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}
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/* Return the dynindex of a local dynamic symbol. */
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long
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_bfd_elf_link_lookup_local_dynindx (info, input_bfd, input_indx)
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struct bfd_link_info *info;
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bfd *input_bfd;
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long input_indx;
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{
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struct elf_link_local_dynamic_entry *e;
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for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
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if (e->input_bfd == input_bfd && e->input_indx == input_indx)
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return e->dynindx;
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return -1;
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}
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/* This function is used to renumber the dynamic symbols, if some of
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them are removed because they are marked as local. This is called
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via elf_link_hash_traverse. */
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static boolean elf_link_renumber_hash_table_dynsyms
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PARAMS ((struct elf_link_hash_entry *, PTR));
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static boolean
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elf_link_renumber_hash_table_dynsyms (h, data)
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struct elf_link_hash_entry *h;
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PTR data;
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{
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size_t *count = (size_t *) data;
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if (h->root.type == bfd_link_hash_warning)
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h = (struct elf_link_hash_entry *) h->root.u.i.link;
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if (h->dynindx != -1)
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h->dynindx = ++(*count);
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return true;
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}
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/* Assign dynsym indices. In a shared library we generate a section
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symbol for each output section, which come first. Next come all of
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the back-end allocated local dynamic syms, followed by the rest of
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the global symbols. */
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unsigned long
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_bfd_elf_link_renumber_dynsyms (output_bfd, info)
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bfd *output_bfd;
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struct bfd_link_info *info;
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{
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unsigned long dynsymcount = 0;
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if (info->shared)
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{
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asection *p;
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for (p = output_bfd->sections; p ; p = p->next)
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if ((p->flags & SEC_EXCLUDE) == 0)
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elf_section_data (p)->dynindx = ++dynsymcount;
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}
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if (elf_hash_table (info)->dynlocal)
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{
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struct elf_link_local_dynamic_entry *p;
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for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
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p->dynindx = ++dynsymcount;
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}
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elf_link_hash_traverse (elf_hash_table (info),
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elf_link_renumber_hash_table_dynsyms,
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&dynsymcount);
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/* There is an unused NULL entry at the head of the table which
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we must account for in our count. Unless there weren't any
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symbols, which means we'll have no table at all. */
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if (dynsymcount != 0)
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++dynsymcount;
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return elf_hash_table (info)->dynsymcount = dynsymcount;
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}
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/* Create a special linker section, or return a pointer to a linker
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section already created */
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elf_linker_section_t *
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_bfd_elf_create_linker_section (abfd, info, which, defaults)
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bfd *abfd;
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struct bfd_link_info *info;
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enum elf_linker_section_enum which;
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elf_linker_section_t *defaults;
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{
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bfd *dynobj = elf_hash_table (info)->dynobj;
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elf_linker_section_t *lsect;
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/* Record the first bfd section that needs the special section */
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if (!dynobj)
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dynobj = elf_hash_table (info)->dynobj = abfd;
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/* If this is the first time, create the section */
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lsect = elf_linker_section (dynobj, which);
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if (!lsect)
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{
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asection *s;
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bfd_size_type amt = sizeof (elf_linker_section_t);
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lsect = (elf_linker_section_t *) bfd_alloc (dynobj, amt);
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*lsect = *defaults;
|
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elf_linker_section (dynobj, which) = lsect;
|
||
lsect->which = which;
|
||
lsect->hole_written_p = false;
|
||
|
||
/* See if the sections already exist */
|
||
lsect->section = s = bfd_get_section_by_name (dynobj, lsect->name);
|
||
if (!s || (s->flags & defaults->flags) != defaults->flags)
|
||
{
|
||
lsect->section = s = bfd_make_section_anyway (dynobj, lsect->name);
|
||
|
||
if (s == NULL)
|
||
return (elf_linker_section_t *)0;
|
||
|
||
bfd_set_section_flags (dynobj, s, defaults->flags);
|
||
bfd_set_section_alignment (dynobj, s, lsect->alignment);
|
||
}
|
||
else if (bfd_get_section_alignment (dynobj, s) < lsect->alignment)
|
||
bfd_set_section_alignment (dynobj, s, lsect->alignment);
|
||
|
||
s->_raw_size = align_power (s->_raw_size, lsect->alignment);
|
||
|
||
/* Is there a hole we have to provide? If so check whether the segment is
|
||
too big already */
|
||
if (lsect->hole_size)
|
||
{
|
||
lsect->hole_offset = s->_raw_size;
|
||
s->_raw_size += lsect->hole_size;
|
||
if (lsect->hole_offset > lsect->max_hole_offset)
|
||
{
|
||
(*_bfd_error_handler) (_("%s: Section %s is too large to add hole of %ld bytes"),
|
||
bfd_get_filename (abfd),
|
||
lsect->name,
|
||
(long) lsect->hole_size);
|
||
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return (elf_linker_section_t *)0;
|
||
}
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "Creating section %s, current size = %ld\n",
|
||
lsect->name, (long)s->_raw_size);
|
||
#endif
|
||
|
||
if (lsect->sym_name)
|
||
{
|
||
struct elf_link_hash_entry *h;
|
||
struct bfd_link_hash_entry *bh;
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "Adding %s to section %s\n",
|
||
lsect->sym_name,
|
||
lsect->name);
|
||
#endif
|
||
bh = bfd_link_hash_lookup (info->hash, lsect->sym_name,
|
||
false, false, false);
|
||
|
||
if ((bh == NULL || bh->type == bfd_link_hash_undefined)
|
||
&& !(_bfd_generic_link_add_one_symbol
|
||
(info, abfd, lsect->sym_name, BSF_GLOBAL, s,
|
||
(lsect->hole_size
|
||
? s->_raw_size - lsect->hole_size + lsect->sym_offset
|
||
: lsect->sym_offset),
|
||
(const char *) NULL, false,
|
||
get_elf_backend_data (abfd)->collect, &bh)))
|
||
return (elf_linker_section_t *) 0;
|
||
h = (struct elf_link_hash_entry *) bh;
|
||
|
||
if ((defaults->which != LINKER_SECTION_SDATA)
|
||
&& (defaults->which != LINKER_SECTION_SDATA2))
|
||
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_DYNAMIC;
|
||
|
||
h->type = STT_OBJECT;
|
||
lsect->sym_hash = h;
|
||
|
||
if (info->shared
|
||
&& ! _bfd_elf_link_record_dynamic_symbol (info, h))
|
||
return (elf_linker_section_t *) 0;
|
||
}
|
||
}
|
||
|
||
#if 0
|
||
/* This does not make sense. The sections which may exist in the
|
||
object file have nothing to do with the sections we want to
|
||
create. */
|
||
|
||
/* Find the related sections if they have been created */
|
||
if (lsect->bss_name && !lsect->bss_section)
|
||
lsect->bss_section = bfd_get_section_by_name (dynobj, lsect->bss_name);
|
||
|
||
if (lsect->rel_name && !lsect->rel_section)
|
||
lsect->rel_section = bfd_get_section_by_name (dynobj, lsect->rel_name);
|
||
#endif
|
||
|
||
return lsect;
|
||
}
|
||
|
||
/* Find a linker generated pointer with a given addend and type. */
|
||
|
||
elf_linker_section_pointers_t *
|
||
_bfd_elf_find_pointer_linker_section (linker_pointers, addend, which)
|
||
elf_linker_section_pointers_t *linker_pointers;
|
||
bfd_vma addend;
|
||
elf_linker_section_enum_t which;
|
||
{
|
||
for ( ; linker_pointers != NULL; linker_pointers = linker_pointers->next)
|
||
{
|
||
if (which == linker_pointers->which && addend == linker_pointers->addend)
|
||
return linker_pointers;
|
||
}
|
||
|
||
return (elf_linker_section_pointers_t *)0;
|
||
}
|
||
|
||
/* Make the .rela section corresponding to the generated linker section. */
|
||
|
||
boolean
|
||
_bfd_elf_make_linker_section_rela (dynobj, lsect, alignment)
|
||
bfd *dynobj;
|
||
elf_linker_section_t *lsect;
|
||
int alignment;
|
||
{
|
||
if (lsect->rel_section)
|
||
return true;
|
||
|
||
lsect->rel_section = bfd_get_section_by_name (dynobj, lsect->rel_name);
|
||
if (lsect->rel_section == NULL)
|
||
{
|
||
lsect->rel_section = bfd_make_section (dynobj, lsect->rel_name);
|
||
if (lsect->rel_section == NULL
|
||
|| ! bfd_set_section_flags (dynobj,
|
||
lsect->rel_section,
|
||
(SEC_ALLOC
|
||
| SEC_LOAD
|
||
| SEC_HAS_CONTENTS
|
||
| SEC_IN_MEMORY
|
||
| SEC_LINKER_CREATED
|
||
| SEC_READONLY))
|
||
|| ! bfd_set_section_alignment (dynobj, lsect->rel_section, alignment))
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|