1 files changed, 105 insertions, 0 deletions
diff --git a/bfd/elf-ifunc.c b/bfd/elf-ifunc.c
new file mode 100644
index 0000000..4bfc31b
--- /dev/null
+++ b/bfd/elf-ifunc.c
@@ -0,0 +1,105 @@
+/* ELF STT_GNU_IFUNC support.
+   Copyright 2009
+   Free Software Foundation, Inc.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#include "sysdep.h"
+#include "bfd.h"
+#include "bfdlink.h"
+#include "libbfd.h"
+#define ARCH_SIZE 0
+#include "elf-bfd.h"
+#include "safe-ctype.h"
+#include "libiberty.h"
+#include "objalloc.h"
+
+/* Create sections needed by STT_GNU_IFUNC symbol.  */
+
+bfd_boolean
+_bfd_elf_create_ifunc_sections (bfd *abfd, struct bfd_link_info *info)
+{
+  flagword flags, pltflags;
+  asection *s;
+  const struct elf_backend_data *bed = get_elf_backend_data (abfd);
+  struct elf_link_hash_table *htab = elf_hash_table (info);
+
+  if (htab->irelifunc != NULL || htab->iplt != NULL)
+    return TRUE;
+
+  flags = bed->dynamic_sec_flags;
+  pltflags = flags;
+  if (bed->plt_not_loaded)
+    /* We do not clear SEC_ALLOC here because we still want the OS to
+       allocate space for the section; it's just that there's nothing
+       to read in from the object file.  */
+    pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
+  else
+    pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
+  if (bed->plt_readonly)
+    pltflags |= SEC_READONLY;
+
+  if (info->shared)
+    {
+      /* We need to create .rel[a].ifunc for shared objects.  */
+      const char *rel_sec = (bed->rela_plts_and_copies_p
+			     ? ".rela.ifunc" : ".rel.ifunc");
+
+      s = bfd_make_section_with_flags (abfd, rel_sec,
+				       flags | SEC_READONLY);
+      if (s == NULL
+	  || ! bfd_set_section_alignment (abfd, s,
+					  bed->s->log_file_align))
+	return FALSE;
+      htab->irelifunc = s;
+    }
+  else
+    {
+      /* We need to create .iplt, .rel[a].iplt, .igot and .igot.plt
+	 for static executables.   */
+      s = bfd_make_section_with_flags (abfd, ".iplt", pltflags);
+      if (s == NULL
+	  || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
+	return FALSE;
+      htab->iplt = s;
+
+      s = bfd_make_section_with_flags (abfd,
+				       (bed->rela_plts_and_copies_p
+					? ".rela.iplt" : ".rel.iplt"),
+				       flags | SEC_READONLY);
+      if (s == NULL
+	  || ! bfd_set_section_alignment (abfd, s,
+					  bed->s->log_file_align))
+	return FALSE;
+      htab->irelplt = s;
+
+      /* We don't need the .igot section if we have the .igot.plt
+	 section.  */
+      if (bed->want_got_plt)
+	s = bfd_make_section_with_flags (abfd, ".igot.plt", flags);
+      else
+	s = bfd_make_section_with_flags (abfd, ".igot", flags);
+      if (s == NULL
+	  || !bfd_set_section_alignment (abfd, s,
+					 bed->s->log_file_align))
+	return FALSE;
+      htab->igotplt = s;
+    }
+
+  return TRUE;
+}