binutils-gdb/bfd/archive64.c

/* MIPS-specific support for 64-bit ELF
   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006, 2007,
   2010, 2012  Free Software Foundation, Inc.
   Ian Lance Taylor, Cygnus Support
   Linker support added by Mark Mitchell, CodeSourcery, LLC.
   <mark@codesourcery.com>

   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.  */

/* This file supports the 64-bit (MIPS) ELF archives.  */

#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "aout/ar.h"

/* Irix 6 defines a 64bit archive map format, so that they can
   have archives more than 4 GB in size.  */

bfd_boolean bfd_elf64_archive_slurp_armap (bfd *);
bfd_boolean bfd_elf64_archive_write_armap
  (bfd *, unsigned int, struct orl *, unsigned int, int);

/* Read an Irix 6 armap.  */

bfd_boolean
bfd_elf64_archive_slurp_armap (bfd *abfd)
{
  struct artdata *ardata = bfd_ardata (abfd);
  char nextname[17];
  bfd_size_type i, parsed_size, nsymz, stringsize, carsym_size, ptrsize;
  struct areltdata *mapdata;
  bfd_byte int_buf[8];
  char *stringbase;
  bfd_byte *raw_armap = NULL;
  carsym *carsyms;
  bfd_size_type amt;

  ardata->symdefs = NULL;

  /* Get the name of the first element.  */
  i = bfd_bread (nextname, 16, abfd);
  if (i == 0)
    return TRUE;
  if (i != 16)
    return FALSE;

  if (bfd_seek (abfd, (file_ptr) - 16, SEEK_CUR) != 0)
    return FALSE;

  /* Archives with traditional armaps are still permitted.  */
  if (CONST_STRNEQ (nextname, "/               "))
    return bfd_slurp_armap (abfd);

  if (! CONST_STRNEQ (nextname, "/SYM64/         "))
    {
      bfd_has_map (abfd) = FALSE;
      return TRUE;
    }

  mapdata = (struct areltdata *) _bfd_read_ar_hdr (abfd);
  if (mapdata == NULL)
    return FALSE;
  parsed_size = mapdata->parsed_size;
  bfd_release (abfd, mapdata);

  if (bfd_bread (int_buf, 8, abfd) != 8)
    {
      if (bfd_get_error () != bfd_error_system_call)
	bfd_set_error (bfd_error_malformed_archive);
      return FALSE;
    }

  nsymz = bfd_getb64 (int_buf);
  stringsize = parsed_size - 8 * nsymz - 8;

  carsym_size = nsymz * sizeof (carsym);
  ptrsize = 8 * nsymz;

  amt = carsym_size + stringsize + 1;
  ardata->symdefs = (struct carsym *) bfd_zalloc (abfd, amt);
  if (ardata->symdefs == NULL)
    return FALSE;
  carsyms = ardata->symdefs;
  stringbase = ((char *) ardata->symdefs) + carsym_size;

  raw_armap = (bfd_byte *) bfd_alloc (abfd, ptrsize);
  if (raw_armap == NULL)
    goto release_symdefs;

  if (bfd_bread (raw_armap, ptrsize, abfd) != ptrsize
      || bfd_bread (stringbase, stringsize, abfd) != stringsize)
    {
      if (bfd_get_error () != bfd_error_system_call)
	bfd_set_error (bfd_error_malformed_archive);
      goto release_raw_armap;
    }

  for (i = 0; i < nsymz; i++)
    {
      carsyms->file_offset = bfd_getb64 (raw_armap + i * 8);
      carsyms->name = stringbase;
      stringbase += strlen (stringbase) + 1;
      ++carsyms;
    }
  *stringbase = '\0';

  ardata->symdef_count = nsymz;
  ardata->first_file_filepos = bfd_tell (abfd);
  /* Pad to an even boundary if you have to.  */
  ardata->first_file_filepos += (ardata->first_file_filepos) % 2;

  bfd_has_map (abfd) = TRUE;
  bfd_release (abfd, raw_armap);

  return TRUE;

release_raw_armap:
  bfd_release (abfd, raw_armap);
release_symdefs:
  bfd_release (abfd, ardata->symdefs);
  return FALSE;
}

/* Write out an Irix 6 armap.  The Irix 6 tools are supposed to be
   able to handle ordinary ELF armaps, but at least on Irix 6.2 the
   linker crashes.  */

bfd_boolean
bfd_elf64_archive_write_armap (bfd *arch,
			       unsigned int elength,
			       struct orl *map,
			       unsigned int symbol_count,
			       int stridx)
{
  unsigned int ranlibsize = (symbol_count * 8) + 8;
  unsigned int stringsize = stridx;
  unsigned int mapsize = stringsize + ranlibsize;
  file_ptr archive_member_file_ptr;
  bfd *current = arch->archive_head;
  unsigned int count;
  struct ar_hdr hdr;
  int padding;
  bfd_byte buf[8];

  padding = BFD_ALIGN (mapsize, 8) - mapsize;
  mapsize += padding;

  /* work out where the first object file will go in the archive */
  archive_member_file_ptr = (mapsize
			     + elength
			     + sizeof (struct ar_hdr)
			     + SARMAG);

  memset (&hdr, ' ', sizeof (struct ar_hdr));
  memcpy (hdr.ar_name, "/SYM64/", strlen ("/SYM64/"));
  if (!_bfd_ar_sizepad (hdr.ar_size, sizeof (hdr.ar_size), mapsize))
    return FALSE;
  _bfd_ar_spacepad (hdr.ar_date, sizeof (hdr.ar_date), "%ld",
                    time (NULL));
  /* This, at least, is what Intel coff sets the values to.: */
  _bfd_ar_spacepad (hdr.ar_uid, sizeof (hdr.ar_uid), "%ld", 0);
  _bfd_ar_spacepad (hdr.ar_gid, sizeof (hdr.ar_gid), "%ld", 0);
  _bfd_ar_spacepad (hdr.ar_mode, sizeof (hdr.ar_mode), "%-7lo", 0);
  memcpy (hdr.ar_fmag, ARFMAG, 2);

  /* Write the ar header for this item and the number of symbols */

  if (bfd_bwrite (&hdr, sizeof (struct ar_hdr), arch)
      != sizeof (struct ar_hdr))
    return FALSE;

  bfd_putb64 ((bfd_vma) symbol_count, buf);
  if (bfd_bwrite (buf, 8, arch) != 8)
    return FALSE;

  /* Two passes, first write the file offsets for each symbol -
     remembering that each offset is on a two byte boundary.  */

  /* Write out the file offset for the file associated with each
     symbol, and remember to keep the offsets padded out.  */
  count = 0;
  for (current = arch->archive_head;
       current != NULL && count < symbol_count;
       current = current->archive_next)
    {
      /* For each symbol which is used defined in this object, write out
	 the object file's address in the archive */

      for (;
	   count < symbol_count && map[count].u.abfd == current;
	   count++)
	{
	  bfd_putb64 ((bfd_vma) archive_member_file_ptr, buf);
	  if (bfd_bwrite (buf, 8, arch) != 8)
	    return FALSE;
	}
      /* Add size of this archive entry */
      archive_member_file_ptr += (arelt_size (current)
				  + sizeof (struct ar_hdr));
      /* remember about the even alignment */
      archive_member_file_ptr += archive_member_file_ptr % 2;
    }

  /* now write the strings themselves */
  for (count = 0; count < symbol_count; count++)
    {
      size_t len = strlen (*map[count].name) + 1;

      if (bfd_bwrite (*map[count].name, len, arch) != len)
	return FALSE;
    }

  /* The spec says that this should be padded to an 8 byte boundary.
     However, the Irix 6.2 tools do not appear to do this.  */
  while (padding != 0)
    {
      if (bfd_bwrite ("", 1, arch) != 1)
	return FALSE;
      --padding;
    }

  return TRUE;
}