Add elfedit

binutils/

2010-01-06  H.J. Lu  <hongjiu.lu@intel.com>

	PR binutils/11131
	* Makefile.am (ELFEDIT_PROG): New.
	(bin_PROGRAMS): Add $(ELFEDIT_PROG).
	(CFILES): Add elfedit.c.
	(elfedit_DEPENDENCIES): New.
	(elfedit_SOURCES): Likewise.
	(elfedit_LDADD): Likewise.
	* Makefile.in: Regenerated.

	* elfedit.c: New.

	* doc/binutils.texi: Document elfedit.

	* doc/Makefile.am (man_MANS): Add elfedit.1.
	(elfedit.1): New.
	* doc/Makefile.in: Regenerated.

binutils/testsuite/

2010-01-06  H.J. Lu  <hongjiu.lu@intel.com>

	PR binutils/11131
	* binutils-all/elfedit-1.d: New.
	* binutils-all/elfedit.exp: Likewise.

	* config/default.exp (ELFEDIT): New. Set if it doesn't exist.
	(ELFEDITFLAGS): Likewise.

	* lib/utils-lib.exp (run_dump_test): Support elfedit.

1 files changed, 1110 insertions, 0 deletions

diff --git a/binutils/elfedit.c b/binutils/elfedit.c
new file mode 100644
index 0000000000..28e40be321
--- /dev/null
+++ b/binutils/elfedit.c
@@ -0,0 +1,1110 @@
+/* elfedit.c -- Update the ELF header of an ELF format file
+   Copyright 2010
+   Free Software Foundation, Inc.
+
+   This file is part of GNU Binutils.
+
+   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 "config.h"
+#include "sysdep.h"
+#include <assert.h>
+#include <sys/stat.h>
+
+#if __GNUC__ >= 2
+/* Define BFD64 here, even if our default architecture is 32 bit ELF
+   as this will allow us to read in and parse 64bit and 32bit ELF files.
+   Only do this if we believe that the compiler can support a 64 bit
+   data type.  For now we only rely on GCC being able to do this.  */
+#define BFD64
+#endif
+
+#include "bfd.h"
+#include "bucomm.h"
+
+#include "elf/common.h"
+#include "elf/external.h"
+#include "elf/internal.h"
+
+
+#include "aout/ar.h"
+
+#include "getopt.h"
+#include "libiberty.h"
+#include "safe-ctype.h"
+#include "filenames.h"
+
+char * program_name = "elfedit";
+static long archive_file_offset;
+static unsigned long archive_file_size;
+static Elf_Internal_Ehdr elf_header;
+static Elf32_External_Ehdr ehdr32;
+static Elf64_External_Ehdr ehdr64;
+static int input_elf_machine = -1;
+static int output_elf_machine = -1;
+static int input_elf_class = -1;
+
+#define streq(a,b)	  (strcmp ((a), (b)) == 0)
+#define strneq(a,b,n)	  (strncmp ((a), (b), (n)) == 0)
+#define const_strneq(a,b) (strncmp ((a), (b), sizeof (b) - 1) == 0)
+
+void
+non_fatal (const char *message, ...)
+{
+  va_list args;
+
+  va_start (args, message);
+  fprintf (stderr, _("%s: Error: "), program_name);
+  vfprintf (stderr, message, args);
+  va_end (args);
+}
+
+#define BYTE_GET(field)		byte_get (field, sizeof (field))
+#define BYTE_PUT(field, val)	byte_put (field, val, sizeof (field))
+
+static bfd_vma (*byte_get) (unsigned char *, int);
+static void (*byte_put) (unsigned char *, bfd_vma, int);
+
+static bfd_vma
+byte_get_little_endian (unsigned char *field, int size)
+{
+  switch (size)
+    {
+    case 1:
+      return *field;
+
+    case 2:
+      return  ((unsigned int) (field[0]))
+	|    (((unsigned int) (field[1])) << 8);
+
+    case 4:
+      return  ((unsigned long) (field[0]))
+	|    (((unsigned long) (field[1])) << 8)
+	|    (((unsigned long) (field[2])) << 16)
+	|    (((unsigned long) (field[3])) << 24);
+
+    case 8:
+      if (sizeof (bfd_vma) == 8)
+	return  ((bfd_vma) (field[0]))
+	  |    (((bfd_vma) (field[1])) << 8)
+	  |    (((bfd_vma) (field[2])) << 16)
+	  |    (((bfd_vma) (field[3])) << 24)
+	  |    (((bfd_vma) (field[4])) << 32)
+	  |    (((bfd_vma) (field[5])) << 40)
+	  |    (((bfd_vma) (field[6])) << 48)
+	  |    (((bfd_vma) (field[7])) << 56);
+      else if (sizeof (bfd_vma) == 4)
+	/* We want to extract data from an 8 byte wide field and
+	   place it into a 4 byte wide field.  Since this is a little
+	   endian source we can just use the 4 byte extraction code.  */
+	return  ((unsigned long) (field[0]))
+	  |    (((unsigned long) (field[1])) << 8)
+	  |    (((unsigned long) (field[2])) << 16)
+	  |    (((unsigned long) (field[3])) << 24);
+
+    default:
+      non_fatal (_("Unhandled data length: %d\n"), size);
+      abort ();
+    }
+}
+
+static bfd_vma
+byte_get_big_endian (unsigned char *field, int size)
+{
+  switch (size)
+    {
+    case 1:
+      return *field;
+
+    case 2:
+      return ((unsigned int) (field[1])) | (((int) (field[0])) << 8);
+
+    case 4:
+      return ((unsigned long) (field[3]))
+	|   (((unsigned long) (field[2])) << 8)
+	|   (((unsigned long) (field[1])) << 16)
+	|   (((unsigned long) (field[0])) << 24);
+
+    case 8:
+      if (sizeof (bfd_vma) == 8)
+	return ((bfd_vma) (field[7]))
+	  |   (((bfd_vma) (field[6])) << 8)
+	  |   (((bfd_vma) (field[5])) << 16)
+	  |   (((bfd_vma) (field[4])) << 24)
+	  |   (((bfd_vma) (field[3])) << 32)
+	  |   (((bfd_vma) (field[2])) << 40)
+	  |   (((bfd_vma) (field[1])) << 48)
+	  |   (((bfd_vma) (field[0])) << 56);
+      else if (sizeof (bfd_vma) == 4)
+	{
+	  /* Although we are extracing data from an 8 byte wide field,
+	     we are returning only 4 bytes of data.  */
+	  field += 4;
+	  return ((unsigned long) (field[3]))
+	    |   (((unsigned long) (field[2])) << 8)
+	    |   (((unsigned long) (field[1])) << 16)
+	    |   (((unsigned long) (field[0])) << 24);
+	}
+
+    default:
+      non_fatal (_("Unhandled data length: %d\n"), size);
+      abort ();
+    }
+}
+
+static void
+byte_put_little_endian (unsigned char * field, bfd_vma value, int size)
+{
+  switch (size)
+    {
+    case 8:
+      field[7] = (((value >> 24) >> 24) >> 8) & 0xff;
+      field[6] = ((value >> 24) >> 24) & 0xff;
+      field[5] = ((value >> 24) >> 16) & 0xff;
+      field[4] = ((value >> 24) >> 8) & 0xff;
+      /* Fall through.  */
+    case 4:
+      field[3] = (value >> 24) & 0xff;
+      field[2] = (value >> 16) & 0xff;
+      /* Fall through.  */
+    case 2:
+      field[1] = (value >> 8) & 0xff;
+      /* Fall through.  */
+    case 1:
+      field[0] = value & 0xff;
+      break;
+
+    default:
+      non_fatal (_("Unhandled data length: %d\n"), size);
+      abort ();
+    }
+}
+
+static void
+byte_put_big_endian (unsigned char * field, bfd_vma value, int size)
+{
+  switch (size)
+    {
+    case 8:
+      field[7] = value & 0xff;
+      field[6] = (value >> 8) & 0xff;
+      field[5] = (value >> 16) & 0xff;
+      field[4] = (value >> 24) & 0xff;
+      value >>= 16;
+      value >>= 16;
+      /* Fall through.  */
+    case 4:
+      field[3] = value & 0xff;
+      field[2] = (value >> 8) & 0xff;
+      value >>= 16;
+      /* Fall through.  */
+    case 2:
+      field[1] = value & 0xff;
+      value >>= 8;
+      /* Fall through.  */
+    case 1:
+      field[0] = value & 0xff;
+      break;
+
+    default:
+      non_fatal (_("Unhandled data length: %d\n"), size);
+      abort ();
+    }
+}
+
+static int
+update_elf_header (const char *file_name, FILE *file)
+{
+  int status;
+
+  if (elf_header.e_ident[EI_MAG0] != ELFMAG0
+      || elf_header.e_ident[EI_MAG1] != ELFMAG1
+      || elf_header.e_ident[EI_MAG2] != ELFMAG2
+      || elf_header.e_ident[EI_MAG3] != ELFMAG3)
+    {
+      non_fatal
+	(_("%s: Not an ELF file - wrong magic bytes at the start\n"),
+	 file_name);
+      return 0;
+    }
+
+  if (elf_header.e_ident[EI_VERSION] != EV_CURRENT)
+    {
+      non_fatal
+	(_("%s: Unsupported EI_VERSION: %d is not %d\n"),
+	 file_name, elf_header.e_ident[EI_VERSION],
+	 EV_CURRENT);
+      return 0;
+    }
+
+  /* Skip if class doesn't match. */
+  if (input_elf_class == -1)
+    input_elf_class = elf_header.e_ident[EI_CLASS];
+  else
+  if (elf_header.e_ident[EI_CLASS] != input_elf_class)
+    {
+      non_fatal
+	(_("%s: Unmatched EI_CLASS: %d is not %d\n"),
+	 file_name, elf_header.e_ident[EI_CLASS],
+	 input_elf_class);
+      return 0;
+    }
+
+  /* Return if e_machine is the same as output_elf_machine.  */
+  if (output_elf_machine == elf_header.e_machine)
+    return 1;
+
+  /* Skip if e_machine doesn't match. */
+  if (input_elf_machine == -1)
+    input_elf_machine = elf_header.e_machine;
+  else if (elf_header.e_machine != input_elf_machine)
+    {
+      non_fatal
+	(_("%s: Unmatched e_machine: %d is not %d\n"),
+	 file_name, elf_header.e_machine, input_elf_machine);
+      return 0;
+    }
+
+  /* Update e_machine.  */
+  switch (input_elf_class)
+    {
+    default:
+      /* We should never get here.  */
+      abort ();
+      break;
+    case ELFCLASS32:
+      BYTE_PUT (ehdr32.e_machine, output_elf_machine);
+      status = fwrite (&ehdr32, sizeof (ehdr32), 1, file) == 1;
+      break;
+    case ELFCLASS64:
+      BYTE_PUT (ehdr64.e_machine, output_elf_machine);
+      status = fwrite (&ehdr64, sizeof (ehdr64), 1, file) == 1;
+      break;
+    }
+
+  if (status != 1)
+    non_fatal (_("%s: Failed to update ELF header: %s\n"),
+	       file_name, strerror (errno));
+
+  return status;
+}
+
+static int
+get_file_header (FILE * file)
+{
+  /* Read in the identity array.  */
+  if (fread (elf_header.e_ident, EI_NIDENT, 1, file) != 1)
+    return 0;
+
+  /* Determine how to read the rest of the header.  */
+  switch (elf_header.e_ident[EI_DATA])
+    {
+    default: /* fall through */
+    case ELFDATANONE: /* fall through */
+    case ELFDATA2LSB:
+      byte_get = byte_get_little_endian;
+      byte_put = byte_put_little_endian;
+      break;
+    case ELFDATA2MSB:
+      byte_get = byte_get_big_endian;
+      byte_put = byte_put_big_endian;
+      break;
+    }
+
+  /* Read in the rest of the header.  For now we only support 32 bit
+     and 64 bit ELF files.  */
+  switch (elf_header.e_ident[EI_CLASS])
+    {
+    default:
+      non_fatal (_("Unsupported EI_CLASS: %d\n"),
+		 elf_header.e_ident[EI_CLASS]);
+      return 0;
+
+    case ELFCLASS32:
+      if (fread (ehdr32.e_type, sizeof (ehdr32) - EI_NIDENT,
+		 1, file) != 1)
+	return 0;
+
+      elf_header.e_type      = BYTE_GET (ehdr32.e_type);
+      elf_header.e_machine   = BYTE_GET (ehdr32.e_machine);
+      elf_header.e_version   = BYTE_GET (ehdr32.e_version);
+      elf_header.e_entry     = BYTE_GET (ehdr32.e_entry);
+      elf_header.e_phoff     = BYTE_GET (ehdr32.e_phoff);
+      elf_header.e_shoff     = BYTE_GET (ehdr32.e_shoff);
+      elf_header.e_flags     = BYTE_GET (ehdr32.e_flags);
+      elf_header.e_ehsize    = BYTE_GET (ehdr32.e_ehsize);
+      elf_header.e_phentsize = BYTE_GET (ehdr32.e_phentsize);
+      elf_header.e_phnum     = BYTE_GET (ehdr32.e_phnum);
+      elf_header.e_shentsize = BYTE_GET (ehdr32.e_shentsize);
+      elf_header.e_shnum     = BYTE_GET (ehdr32.e_shnum);
+      elf_header.e_shstrndx  = BYTE_GET (ehdr32.e_shstrndx);
+
+      memcpy (&ehdr32, &elf_header, EI_NIDENT);
+      break;
+
+    case ELFCLASS64:
+      /* If we have been compiled with sizeof (bfd_vma) == 4, then
+	 we will not be able to cope with the 64bit data found in
+	 64 ELF files.  Detect this now and abort before we start
+	 overwriting things.  */
+      if (sizeof (bfd_vma) < 8)
+	{
+	  non_fatal (_("This executable has been built without support for a\n\
+64 bit data type and so it cannot process 64 bit ELF files.\n"));
+	  return 0;
+	}
+
+      if (fread (ehdr64.e_type, sizeof (ehdr64) - EI_NIDENT,
+		 1, file) != 1)
+	return 0;
+
+      elf_header.e_type      = BYTE_GET (ehdr64.e_type);
+      elf_header.e_machine   = BYTE_GET (ehdr64.e_machine);
+      elf_header.e_version   = BYTE_GET (ehdr64.e_version);
+      elf_header.e_entry     = BYTE_GET (ehdr64.e_entry);
+      elf_header.e_phoff     = BYTE_GET (ehdr64.e_phoff);
+      elf_header.e_shoff     = BYTE_GET (ehdr64.e_shoff);
+      elf_header.e_flags     = BYTE_GET (ehdr64.e_flags);
+      elf_header.e_ehsize    = BYTE_GET (ehdr64.e_ehsize);
+      elf_header.e_phentsize = BYTE_GET (ehdr64.e_phentsize);
+      elf_header.e_phnum     = BYTE_GET (ehdr64.e_phnum);
+      elf_header.e_shentsize = BYTE_GET (ehdr64.e_shentsize);
+      elf_header.e_shnum     = BYTE_GET (ehdr64.e_shnum);
+      elf_header.e_shstrndx  = BYTE_GET (ehdr64.e_shstrndx);
+
+      memcpy (&ehdr64, &elf_header, EI_NIDENT);
+      break;
+    }
+  return 1;
+}
+
+/* Process one ELF object file according to the command line options.
+   This file may actually be stored in an archive.  The file is
+   positioned at the start of the ELF object.  */
+
+static int
+process_object (const char *file_name, FILE *file)
+{
+  /* Rememeber where we are.  */
+  long offset = ftell (file);
+
+  if (! get_file_header (file))
+    {
+      non_fatal (_("%s: Failed to read ELF header\n"), file_name);
+      return 1;
+    }
+
+  /* Go to the position of the ELF header.  */
+  if (fseek (file, offset, SEEK_SET) != 0)
+    {
+      non_fatal (_("%s: Failed to seek to ELF header\n"), file_name);
+    }
+
+  if (! update_elf_header (file_name, file))
+    return 1;
+
+  return 0;
+}
+
+/* Return the path name for a proxy entry in a thin archive, adjusted relative
+   to the path name of the thin archive itself if necessary.  Always returns
+   a pointer to malloc'ed memory.  */
+
+static char *
+adjust_relative_path (const char *file_name, char * name, int name_len)
+{
+  char * member_file_name;
+  const char * base_name = lbasename (file_name);
+
+  /* This is a proxy entry for a thin archive member.
+     If the extended name table contains an absolute path
+     name, or if the archive is in the current directory,
+     use the path name as given.  Otherwise, we need to
+     find the member relative to the directory where the
+     archive is located.  */
+  if (IS_ABSOLUTE_PATH (name) || base_name == file_name)
+    {
+      member_file_name = malloc (name_len + 1);
+      if (member_file_name == NULL)
+        {
+          non_fatal (_("Out of memory\n"));
+          return NULL;
+        }
+      memcpy (member_file_name, name, name_len);
+      member_file_name[name_len] = '\0';
+    }
+  else
+    {
+      /* Concatenate the path components of the archive file name
+         to the relative path name from the extended name table.  */
+      size_t prefix_len = base_name - file_name;
+      member_file_name = malloc (prefix_len + name_len + 1);
+      if (member_file_name == NULL)
+        {
+          non_fatal (_("Out of memory\n"));
+          return NULL;
+        }
+      memcpy (member_file_name, file_name, prefix_len);
+      memcpy (member_file_name + prefix_len, name, name_len);
+      member_file_name[prefix_len + name_len] = '\0';
+    }
+  return member_file_name;
+}
+
+/* Structure to hold information about an archive file.  */
+
+struct archive_info
+{
+  char * file_name;                     /* Archive file name.  */
+  FILE * file;                          /* Open file descriptor.  */
+  unsigned long index_num;              /* Number of symbols in table.  */
+  unsigned long * index_array;          /* The array of member offsets.  */
+  char * sym_table;                     /* The symbol table.  */
+  unsigned long sym_size;               /* Size of the symbol table.  */
+  char * longnames;                     /* The long file names table.  */
+  unsigned long longnames_size;         /* Size of the long file names table.  */
+  unsigned long nested_member_origin;   /* Origin in the nested archive of the current member.  */
+  unsigned long next_arhdr_offset;      /* Offset of the next archive header.  */
+  bfd_boolean is_thin_archive;          /* TRUE if this is a thin archive.  */
+  struct ar_hdr arhdr;                  /* Current archive header.  */
+};
+
+/* Read the symbol table and long-name table from an archive.  */
+
+static int
+setup_archive (struct archive_info * arch, const char * file_name,
+	       FILE * file, bfd_boolean is_thin_archive)
+{
+  size_t got;
+  unsigned long size;
+
+  arch->file_name = strdup (file_name);
+  arch->file = file;
+  arch->index_num = 0;
+  arch->index_array = NULL;
+  arch->sym_table = NULL;
+  arch->sym_size = 0;
+  arch->longnames = NULL;
+  arch->longnames_size = 0;
+  arch->nested_member_origin = 0;
+  arch->is_thin_archive = is_thin_archive;
+  arch->next_arhdr_offset = SARMAG;
+
+  /* Read the first archive member header.  */
+  if (fseek (file, SARMAG, SEEK_SET) != 0)
+    {
+      non_fatal (_("%s: failed to seek to first archive header\n"),
+		 file_name);
+      return 1;
+    }
+  got = fread (&arch->arhdr, 1, sizeof arch->arhdr, file);
+  if (got != sizeof arch->arhdr)
+    {
+      if (got == 0)
+	return 0;
+
+      non_fatal (_("%s: failed to read archive header\n"), file_name);
+      return 1;
+    }
+
+  /* See if this is the archive symbol table.  */
+  if (const_strneq (arch->arhdr.ar_name, "/               ")
+      || const_strneq (arch->arhdr.ar_name, "/SYM64/         "))
+    {
+      size = strtoul (arch->arhdr.ar_size, NULL, 10);
+      size = size + (size & 1);
+
+      arch->next_arhdr_offset += sizeof arch->arhdr + size;
+
+      if (fseek (file, size, SEEK_CUR) != 0)
+	{
+	  non_fatal (_("%s: failed to skip archive symbol table\n"),
+		     file_name);
+	  return 1;
+	}
+
+      /* Read the next archive header.  */
+      got = fread (&arch->arhdr, 1, sizeof arch->arhdr, file);
+      if (got != sizeof arch->arhdr)
+	{
+	  if (got == 0)
+            return 0;
+	  non_fatal (_("%s: failed to read archive header following archive index\n"),
+		     file_name);
+	  return 1;
+	}
+    }
+
+  if (const_strneq (arch->arhdr.ar_name, "//              "))
+    {
+      /* This is the archive string table holding long member names.  */
+      arch->longnames_size = strtoul (arch->arhdr.ar_size, NULL, 10);
+      arch->next_arhdr_offset += sizeof arch->arhdr + arch->longnames_size;
+
+      arch->longnames = malloc (arch->longnames_size);
+      if (arch->longnames == NULL)
+	{
+	  non_fatal (_("Out of memory reading long symbol names in archive\n"));
+	  return 1;
+	}
+
+      if (fread (arch->longnames, arch->longnames_size, 1, file) != 1)
+	{
+	  free (arch->longnames);
+	  arch->longnames = NULL;
+	  non_fatal (_("%s: failed to read long symbol name string table\n")
+		     , file_name);
+	  return 1;
+	}
+
+      if ((arch->longnames_size & 1) != 0)
+	getc (file);
+    }
+
+  return 0;
+}
+
+/* Release the memory used for the archive information.  */
+
+static void
+release_archive (struct archive_info * arch)
+{
+  if (arch->file_name != NULL)
+    free (arch->file_name);
+  if (arch->index_array != NULL)
+    free (arch->index_array);
+  if (arch->sym_table != NULL)
+    free (arch->sym_table);
+  if (arch->longnames != NULL)
+    free (arch->longnames);
+}
+
+/* Open and setup a nested archive, if not already open.  */
+
+static int
+setup_nested_archive (struct archive_info * nested_arch, char * member_file_name)
+{
+  FILE * member_file;
+
+  /* Have we already setup this archive?  */
+  if (nested_arch->file_name != NULL
+      && streq (nested_arch->file_name, member_file_name))
+    return 0;
+
+  /* Close previous file and discard cached information.  */
+  if (nested_arch->file != NULL)
+    fclose (nested_arch->file);
+  release_archive (nested_arch);
+
+  member_file = fopen (member_file_name, "r+b");
+  if (member_file == NULL)
+    return 1;
+  return setup_archive (nested_arch, member_file_name, member_file,
+			FALSE);
+}
+
+static char *
+get_archive_member_name_at (struct archive_info *  arch,
+			    unsigned long          offset,
+			    struct archive_info *  nested_arch);
+
+/* Get the name of an archive member from the current archive header.
+   For simple names, this will modify the ar_name field of the current
+   archive header.  For long names, it will return a pointer to the
+   longnames table.  For nested archives, it will open the nested archive
+   and get the name recursively.  NESTED_ARCH is a single-entry cache so
+   we don't keep rereading the same information from a nested archive.  */
+
+static char *
+get_archive_member_name (struct archive_info *  arch,
+                         struct archive_info *  nested_arch)
+{
+  unsigned long j, k;
+
+  if (arch->arhdr.ar_name[0] == '/')
+    {
+      /* We have a long name.  */
+      char * endp;
+      char * member_file_name;
+      char * member_name;
+
+      arch->nested_member_origin = 0;
+      k = j = strtoul (arch->arhdr.ar_name + 1, &endp, 10);
+      if (arch->is_thin_archive && endp != NULL && * endp == ':')
+        arch->nested_member_origin = strtoul (endp + 1, NULL, 10);
+
+      while ((j < arch->longnames_size)
+             && (arch->longnames[j] != '\n')
+             && (arch->longnames[j] != '\0'))
+        j++;
+      if (arch->longnames[j-1] == '/')
+        j--;
+      arch->longnames[j] = '\0';
+
+      if (!arch->is_thin_archive || arch->nested_member_origin == 0)
+        return arch->longnames + k;
+
+      /* This is a proxy for a member of a nested archive.
+         Find the name of the member in that archive.  */
+      member_file_name = adjust_relative_path (arch->file_name,
+					       arch->longnames + k,
+					       j - k);
+      if (member_file_name != NULL
+          && setup_nested_archive (nested_arch, member_file_name) == 0
+          && (member_name = get_archive_member_name_at (nested_arch,
+							arch->nested_member_origin,
+							NULL)) != NULL)
+        {
+          free (member_file_name);
+          return member_name;
+        }
+      free (member_file_name);
+
+      /* Last resort: just return the name of the nested archive.  */
+      return arch->longnames + k;
+    }
+
+  /* We have a normal (short) name.  */
+  j = 0;
+  while ((arch->arhdr.ar_name[j] != '/') && (j < 16))
+    j++;
+  arch->arhdr.ar_name[j] = '\0';
+  return arch->arhdr.ar_name;
+}
+
+/* Get the name of an archive member at a given OFFSET within an
+   archive ARCH.  */
+
+static char *
+get_archive_member_name_at (struct archive_info * arch,
+                            unsigned long         offset,
+			    struct archive_info * nested_arch)
+{
+  size_t got;
+
+  if (fseek (arch->file, offset, SEEK_SET) != 0)
+    {
+      non_fatal (_("%s: failed to seek to next file name\n"),
+		 arch->file_name);
+      return NULL;
+    }
+  got = fread (&arch->arhdr, 1, sizeof arch->arhdr, arch->file);
+  if (got != sizeof arch->arhdr)
+    {
+      non_fatal (_("%s: failed to read archive header\n"),
+		 arch->file_name);
+      return NULL;
+    }
+  if (memcmp (arch->arhdr.ar_fmag, ARFMAG, 2) != 0)
+    {
+      non_fatal (_("%s: did not find a valid archive header\n"),
+		 arch->file_name);
+      return NULL;
+    }
+
+  return get_archive_member_name (arch, nested_arch);
+}
+
+/* Construct a string showing the name of the archive member, qualified
+   with the name of the containing archive file.  For thin archives, we
+   use square brackets to denote the indirection.  For nested archives,
+   we show the qualified name of the external member inside the square
+   brackets (e.g., "thin.a[normal.a(foo.o)]").  */
+
+static char *
+make_qualified_name (struct archive_info * arch,
+                     struct archive_info * nested_arch,
+                     char * member_name)
+{
+  size_t len;
+  char * name;
+
+  len = strlen (arch->file_name) + strlen (member_name) + 3;
+  if (arch->is_thin_archive && arch->nested_member_origin != 0)
+    len += strlen (nested_arch->file_name) + 2;
+
+  name = malloc (len);
+  if (name == NULL)
+    {
+      non_fatal (_("Out of memory\n"));
+      return NULL;
+    }
+
+  if (arch->is_thin_archive && arch->nested_member_origin != 0)
+    snprintf (name, len, "%s[%s(%s)]", arch->file_name, nested_arch->file_name, member_name);
+  else if (arch->is_thin_archive)
+    snprintf (name, len, "%s[%s]", arch->file_name, member_name);
+  else
+    snprintf (name, len, "%s(%s)", arch->file_name, member_name);
+
+  return name;
+}
+
+/* Process an ELF archive.
+   On entry the file is positioned just after the ARMAG string.  */
+
+static int
+process_archive (const char * file_name, FILE * file,
+		 bfd_boolean is_thin_archive)
+{
+  struct archive_info arch;
+  struct archive_info nested_arch;
+  size_t got;
+  size_t file_name_size;
+  int ret;
+
+  /* The ARCH structure is used to hold information about this archive.  */
+  arch.file_name = NULL;
+  arch.file = NULL;
+  arch.index_array = NULL;
+  arch.sym_table = NULL;
+  arch.longnames = NULL;
+
+  /* The NESTED_ARCH structure is used as a single-item cache of information
+     about a nested archive (when members of a thin archive reside within
+     another regular archive file).  */
+  nested_arch.file_name = NULL;
+  nested_arch.file = NULL;
+  nested_arch.index_array = NULL;
+  nested_arch.sym_table = NULL;
+  nested_arch.longnames = NULL;
+
+  if (setup_archive (&arch, file_name, file, is_thin_archive) != 0)
+    {
+      ret = 1;
+      goto out;
+    }
+
+  file_name_size = strlen (file_name);
+  ret = 0;
+
+  while (1)
+    {
+      char * name;
+      size_t namelen;
+      char * qualified_name;
+
+      /* Read the next archive header.  */
+      if (fseek (file, arch.next_arhdr_offset, SEEK_SET) != 0)
+        {
+          non_fatal (_("%s: failed to seek to next archive header\n"),
+		     file_name);
+          return 1;
+        }
+      got = fread (&arch.arhdr, 1, sizeof arch.arhdr, file);
+      if (got != sizeof arch.arhdr)
+        {
+          if (got == 0)
+	    break;
+          non_fatal (_("%s: failed to read archive header\n"),
+		     file_name);
+          ret = 1;
+          break;
+        }
+      if (memcmp (arch.arhdr.ar_fmag, ARFMAG, 2) != 0)
+        {
+          non_fatal (_("%s: did not find a valid archive header\n"),
+		     arch.file_name);
+          ret = 1;
+          break;
+        }
+
+      arch.next_arhdr_offset += sizeof arch.arhdr;
+
+      archive_file_size = strtoul (arch.arhdr.ar_size, NULL, 10);
+      if (archive_file_size & 01)
+        ++archive_file_size;
+
+      name = get_archive_member_name (&arch, &nested_arch);
+      if (name == NULL)
+	{
+	  non_fatal (_("%s: bad archive file name\n"), file_name);
+	  ret = 1;
+	  break;
+	}
+      namelen = strlen (name);
+
+      qualified_name = make_qualified_name (&arch, &nested_arch, name);
+      if (qualified_name == NULL)
+	{
+	  non_fatal (_("%s: bad archive file name\n"), file_name);
+	  ret = 1;
+	  break;
+	}
+
+      if (is_thin_archive && arch.nested_member_origin == 0)
+        {
+          /* This is a proxy for an external member of a thin archive.  */
+          FILE *member_file;
+          char *member_file_name = adjust_relative_path (file_name,
+							 name, namelen);
+          if (member_file_name == NULL)
+            {
+              ret = 1;
+              break;
+            }
+
+          member_file = fopen (member_file_name, "r+b");
+          if (member_file == NULL)
+            {
+              non_fatal (_("Input file '%s' is not readable\n"),
+			 member_file_name);
+              free (member_file_name);
+              ret = 1;
+              break;
+            }
+
+          archive_file_offset = arch.nested_member_origin;
+
+          ret |= process_object (qualified_name, member_file);
+
+          fclose (member_file);
+          free (member_file_name);
+        }
+      else if (is_thin_archive)
+        {
+          /* This is a proxy for a member of a nested archive.  */
+          archive_file_offset = arch.nested_member_origin + sizeof arch.arhdr;
+
+          /* The nested archive file will have been opened and setup by
+             get_archive_member_name.  */
+          if (fseek (nested_arch.file, archive_file_offset,
+		     SEEK_SET) != 0)
+            {
+              non_fatal (_("%s: failed to seek to archive member\n"),
+			 nested_arch.file_name);
+              ret = 1;
+              break;
+            }
+
+          ret |= process_object (qualified_name, nested_arch.file);
+        }
+      else
+        {
+          archive_file_offset = arch.next_arhdr_offset;
+          arch.next_arhdr_offset += archive_file_size;
+
+          ret |= process_object (qualified_name, file);
+        }
+
+      free (qualified_name);
+    }
+
+ out:
+  if (nested_arch.file != NULL)
+    fclose (nested_arch.file);
+  release_archive (&nested_arch);
+  release_archive (&arch);
+
+  return ret;
+}
+
+static int
+check_file (const char *file_name, struct stat *statbuf_p)
+{
+  struct stat statbuf;
+
+  if (statbuf_p == NULL)
+    statbuf_p = &statbuf;
+
+  if (stat (file_name, statbuf_p) < 0)
+    {
+      if (errno == ENOENT)
+	non_fatal (_("'%s': No such file\n"), file_name);
+      else
+	non_fatal (_("Could not locate '%s'.  System error message: %s\n"),
+		   file_name, strerror (errno));
+      return 1;
+    }
+
+  if (! S_ISREG (statbuf_p->st_mode))
+    {
+      non_fatal (_("'%s' is not an ordinary file\n"), file_name);
+      return 1;
+    }
+
+  return 0;
+}
+
+static int
+process_file (const char *file_name)
+{
+  FILE * file;
+  char armag[SARMAG];
+  int ret;
+
+  if (check_file (file_name, NULL))
+    return 1;
+
+  file = fopen (file_name, "r+b");
+  if (file == NULL)
+    {
+      non_fatal (_("Input file '%s' is not readable\n"), file_name);
+      return 1;
+    }
+
+  if (fread (armag, SARMAG, 1, file) != 1)
+    {
+      non_fatal (_("%s: Failed to read file's magic number\n"),
+		 file_name);
+      fclose (file);
+      return 1;
+    }
+
+  if (memcmp (armag, ARMAG, SARMAG) == 0)
+    ret = process_archive (file_name, file, FALSE);
+  else if (memcmp (armag, ARMAGT, SARMAG) == 0)
+    ret = process_archive (file_name, file, TRUE);
+  else
+    {
+      rewind (file);
+      archive_file_size = archive_file_offset = 0;
+      ret = process_object (file_name, file);
+    }
+
+  fclose (file);
+
+  return ret;
+}
+
+/* Return EM_XXX for a machine string, MACH.  */
+
+static int
+elf_machine (const char *mach)
+{
+  if (strcasecmp (mach, "l1om") == 0)
+    return EM_L1OM;
+  if (strcasecmp (mach, "x86_64") == 0)
+    return EM_X86_64;
+  if (strcasecmp (mach, "x86-64") == 0)
+    return EM_X86_64;
+  if (strcasecmp (mach, "none") == 0)
+    return EM_NONE;
+
+  non_fatal (_("Unknown machine type: %s\n"), mach);
+
+  return -1;
+}
+
+/* Return ELF class for a machine type, MACH.  */
+
+static int
+elf_class (int mach)
+{
+  switch (mach)
+    {
+    case EM_L1OM:
+    case EM_X86_64:
+      return ELFCLASS64;
+    case EM_NONE:
+      return ELFCLASSNONE;
+    default:
+      non_fatal (_("Unknown machine type: %d\n"), mach);
+      return -1;
+    }
+}
+
+enum command_line_switch
+  {
+    OPTION_INPUT_MACH = 150,
+    OPTION_OUTPUT_MACH
+  };
+
+static struct option options[] =
+{
+  {"input-mach",	required_argument, 0, OPTION_INPUT_MACH},
+  {"output-mach",	required_argument, 0, OPTION_OUTPUT_MACH},
+  {"version",		no_argument, 0, 'v'},
+  {"help",		no_argument, 0, 'h'},
+  {0,			no_argument, 0, 0}
+};
+
+static void
+usage (FILE *stream, int exit_status)
+{
+  fprintf (stream, _("Usage: %s [option(s)] --output-mach <machine> elffile(s)\n"),
+	   program_name);
+  fprintf (stream, _(" Update the ELF header of ELF files\n"));
+  fprintf (stream, _(" The options are:\n"));
+  fprintf (stream, _("\
+  --input-mach <machine>      Set input machine type to <machine>\n\
+  --output-mach <machine>     Set output machine type to <machine>\n\
+  -h --help                   Display this information\n\
+  -v --version                Display the version number of %s\n\
+"),
+	   program_name);
+  if (REPORT_BUGS_TO[0] && exit_status == 0)
+    fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
+  exit (exit_status);
+}
+
+int
+main (int argc, char ** argv)
+{
+  int c, status;
+
+#if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
+  setlocale (LC_MESSAGES, "");
+#endif
+#if defined (HAVE_SETLOCALE)
+  setlocale (LC_CTYPE, "");
+#endif
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  expandargv (&argc, &argv);
+
+  while ((c = getopt_long (argc, argv, "hv",
+			   options, (int *) 0)) != EOF)
+    {
+      switch (c)
+	{
+	case OPTION_INPUT_MACH:
+	  input_elf_machine = elf_machine (optarg);
+	  if (input_elf_machine < 0)
+	    return 1;
+	  input_elf_class = elf_class (input_elf_machine);
+	  if (input_elf_class < 0)
+	    return 1;
+	  break;
+
+	case OPTION_OUTPUT_MACH:
+	  output_elf_machine = elf_machine (optarg);
+	  if (output_elf_machine < 0)
+	    return 1;
+	  break;
+
+	case 'h':
+	  usage (stdout, 0);
+
+	case 'v':
+	  print_version (program_name);
+	  break;
+
+	default:
+	  usage (stderr, 1);
+	}
+    }
+
+  if (optind == argc || output_elf_machine == -1)
+    usage (stderr, 1);
+
+  status = 0;
+  while (optind < argc)
+    status |= process_file (argv[optind++]);
+
+  return status;
+}