106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
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/* ELF STT_GNU_IFUNC support.
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Copyright 2009
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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 3 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., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.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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#include "safe-ctype.h"
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#include "libiberty.h"
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#include "objalloc.h"
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/* Create sections needed by STT_GNU_IFUNC symbol. */
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bfd_boolean
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_bfd_elf_create_ifunc_sections (bfd *abfd, struct bfd_link_info *info)
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{
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flagword flags, pltflags;
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asection *s;
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const struct elf_backend_data *bed = get_elf_backend_data (abfd);
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struct elf_link_hash_table *htab = elf_hash_table (info);
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if (htab->irelifunc != NULL || htab->iplt != NULL)
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return TRUE;
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flags = bed->dynamic_sec_flags;
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pltflags = flags;
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if (bed->plt_not_loaded)
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/* We do not clear SEC_ALLOC here because we still want the OS to
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allocate space for the section; it's just that there's nothing
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to read in from the object file. */
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pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
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else
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pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
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if (bed->plt_readonly)
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pltflags |= SEC_READONLY;
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if (info->shared)
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{
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/* We need to create .rel[a].ifunc for shared objects. */
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const char *rel_sec = (bed->rela_plts_and_copies_p
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? ".rela.ifunc" : ".rel.ifunc");
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s = bfd_make_section_with_flags (abfd, rel_sec,
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flags | SEC_READONLY);
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if (s == NULL
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|| ! bfd_set_section_alignment (abfd, s,
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bed->s->log_file_align))
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return FALSE;
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htab->irelifunc = s;
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}
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else
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{
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/* We need to create .iplt, .rel[a].iplt, .igot and .igot.plt
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for static executables. */
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s = bfd_make_section_with_flags (abfd, ".iplt", pltflags);
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if (s == NULL
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|| ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
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return FALSE;
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htab->iplt = s;
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s = bfd_make_section_with_flags (abfd,
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(bed->rela_plts_and_copies_p
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? ".rela.iplt" : ".rel.iplt"),
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flags | SEC_READONLY);
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if (s == NULL
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|| ! bfd_set_section_alignment (abfd, s,
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bed->s->log_file_align))
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return FALSE;
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htab->irelplt = s;
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/* We don't need the .igot section if we have the .igot.plt
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section. */
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if (bed->want_got_plt)
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s = bfd_make_section_with_flags (abfd, ".igot.plt", flags);
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else
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s = bfd_make_section_with_flags (abfd, ".igot", flags);
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if (s == NULL
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bed->s->log_file_align))
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return FALSE;
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htab->igotplt = s;
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}
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return TRUE;
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}
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