source: trunk/src/binutils/bfd/i386os9k.c@ 1917

/* BFD back-end for os9000 i386 binaries.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2001, 2002
   Free Software Foundation, Inc.
   Written by Cygnus Support.

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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */


#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "bfdlink.h"
#include "libaout.h"            /* BFD a.out internal data structures */
#include "os9k.h"

static const bfd_target * os9k_callback
  PARAMS ((bfd *));
static const bfd_target * os9k_object_p
  PARAMS ((bfd *));
static int os9k_sizeof_headers
  PARAMS ((bfd *, bfd_boolean));
bfd_boolean os9k_swap_exec_header_in
  PARAMS ((bfd *, mh_com *, struct internal_exec *));

/* Swaps the information in an executable header taken from a raw byte
   stream memory image, into the internal exec_header structure.  */
bfd_boolean
os9k_swap_exec_header_in (abfd, raw_bytes, execp)
     bfd *abfd;
     mh_com *raw_bytes;
     struct internal_exec *execp;
{
  mh_com *bytes = (mh_com *) raw_bytes;
  unsigned int dload, dmemsize, dmemstart;

  /* Now fill in fields in the execp, from the bytes in the raw data.  */
  execp->a_info = H_GET_16 (abfd, bytes->m_sync);
  execp->a_syms = 0;
  execp->a_entry = H_GET_32 (abfd, bytes->m_exec);
  execp->a_talign = 2;
  execp->a_dalign = 2;
  execp->a_balign = 2;

  dload = H_GET_32 (abfd, bytes->m_idata);
  execp->a_data = dload + 8;

  if (bfd_seek (abfd, (file_ptr) dload, SEEK_SET) != 0
      || (bfd_bread (&dmemstart, (bfd_size_type) sizeof (dmemstart), abfd)
          != sizeof (dmemstart))
      || (bfd_bread (&dmemsize, (bfd_size_type) sizeof (dmemsize), abfd)
          != sizeof (dmemsize)))
    return FALSE;

  execp->a_tload = 0;
  execp->a_dload = H_GET_32 (abfd, (unsigned char *) &dmemstart);
  execp->a_text = dload - execp->a_tload;
  execp->a_data = H_GET_32 (abfd, (unsigned char *) &dmemsize);
  execp->a_bss = H_GET_32 (abfd, bytes->m_data) - execp->a_data;

  execp->a_trsize = 0;
  execp->a_drsize = 0;

  return TRUE;
}

#if 0
/* Swaps the information in an internal exec header structure into the
   supplied buffer ready for writing to disk.  */

void os9k_swap_exec_header_out
  PARAMS ((bfd *, struct internal_exec *, struct mh_com *));

void
os9k_swap_exec_header_out (abfd, execp, raw_bytes)
     bfd *abfd;
     struct internal_exec *execp;
     mh_com *raw_bytes;
{
  mh_com *bytes = (mh_com *) raw_bytes;

  /* Now fill in fields in the raw data, from the fields in the exec struct. */
  H_PUT_32 (abfd, execp->a_info, bytes->e_info);
  H_PUT_32 (abfd, execp->a_text, bytes->e_text);
  H_PUT_32 (abfd, execp->a_data, bytes->e_data);
  H_PUT_32 (abfd, execp->a_bss, bytes->e_bss);
  H_PUT_32 (abfd, execp->a_syms, bytes->e_syms);
  H_PUT_32 (abfd, execp->a_entry, bytes->e_entry);
  H_PUT_32 (abfd, execp->a_trsize, bytes->e_trsize);
  H_PUT_32 (abfd, execp->a_drsize, bytes->e_drsize);
  H_PUT_32 (abfd, execp->a_tload, bytes->e_tload);
  H_PUT_32 (abfd, execp->a_dload, bytes->e_dload);
  bytes->e_talign[0] = execp->a_talign;
  bytes->e_dalign[0] = execp->a_dalign;
  bytes->e_balign[0] = execp->a_balign;
  bytes->e_relaxable[0] = execp->a_relaxable;
}

#endif  /* 0 */

static const bfd_target *
os9k_object_p (abfd)
     bfd *abfd;
{
  struct internal_exec anexec;
  mh_com exec_bytes;

  if (bfd_bread ((PTR) &exec_bytes, (bfd_size_type) MHCOM_BYTES_SIZE, abfd)
      != MHCOM_BYTES_SIZE)
    {
      if (bfd_get_error () != bfd_error_system_call)
        bfd_set_error (bfd_error_wrong_format);
      return 0;
    }

  anexec.a_info = H_GET_16 (abfd, exec_bytes.m_sync);
  if (N_BADMAG (anexec))
    {
      bfd_set_error (bfd_error_wrong_format);
      return 0;
    }

  if (! os9k_swap_exec_header_in (abfd, &exec_bytes, &anexec))
    {
      if (bfd_get_error () != bfd_error_system_call)
        bfd_set_error (bfd_error_wrong_format);
      return NULL;
    }
  return aout_32_some_aout_object_p (abfd, &anexec, os9k_callback);
}


/* Finish up the opening of a b.out file for reading.  Fill in all the
   fields that are not handled by common code.  */

static const bfd_target *
os9k_callback (abfd)
     bfd *abfd;
{
  struct internal_exec *execp = exec_hdr (abfd);
  unsigned long bss_start;

  /* Architecture and machine type.  */
  bfd_set_arch_mach (abfd, bfd_arch_i386, 0);

  /* The positions of the string table and symbol table.  */
  obj_str_filepos (abfd) = 0;
  obj_sym_filepos (abfd) = 0;

  /* The alignments of the sections.  */
  obj_textsec (abfd)->alignment_power = execp->a_talign;
  obj_datasec (abfd)->alignment_power = execp->a_dalign;
  obj_bsssec (abfd)->alignment_power = execp->a_balign;

  /* The starting addresses of the sections.  */
  obj_textsec (abfd)->vma = execp->a_tload;
  obj_datasec (abfd)->vma = execp->a_dload;

  /* And reload the sizes, since the aout module zaps them.  */
  obj_textsec (abfd)->_raw_size = execp->a_text;

  bss_start = execp->a_dload + execp->a_data;   /* BSS = end of data section.  */
  obj_bsssec (abfd)->vma = align_power (bss_start, execp->a_balign);

  /* The file positions of the sections.  */
  obj_textsec (abfd)->filepos = execp->a_entry;
  obj_datasec (abfd)->filepos = execp->a_dload;

  /* The file positions of the relocation info ***
  obj_textsec (abfd)->rel_filepos = N_TROFF(*execp);
  obj_datasec (abfd)->rel_filepos =  N_DROFF(*execp);  */

  adata (abfd).page_size = 1;   /* Not applicable.  */
  adata (abfd).segment_size = 1;/* Not applicable.  */
  adata (abfd).exec_bytes_size = MHCOM_BYTES_SIZE;

  return abfd->xvec;
}

#if 0
struct bout_data_struct
{
  struct aoutdata a;
  struct internal_exec e;
};

static bfd_boolean
os9k_mkobject (abfd)
     bfd *abfd;
{
  struct bout_data_struct *rawptr;
  bfd_size_type amt = sizeof (struct bout_data_struct);

  rawptr = (struct bout_data_struct *) bfd_zalloc (abfd, amt);
  if (rawptr == NULL)
    return FALSE;

  abfd->tdata.bout_data = rawptr;
  exec_hdr (abfd) = &rawptr->e;

  obj_textsec (abfd) = (asection *) NULL;
  obj_datasec (abfd) = (asection *) NULL;
  obj_bsssec (abfd) = (asection *) NULL;

  return TRUE;
}

static bfd_boolean
os9k_write_object_contents (abfd)
     bfd *abfd;
{
  struct external_exec swapped_hdr;

  if (! aout_32_make_sections (abfd))
    return FALSE;

  exec_hdr (abfd)->a_info = BMAGIC;

  exec_hdr (abfd)->a_text = obj_textsec (abfd)->_raw_size;
  exec_hdr (abfd)->a_data = obj_datasec (abfd)->_raw_size;
  exec_hdr (abfd)->a_bss = obj_bsssec (abfd)->_raw_size;
  exec_hdr (abfd)->a_syms = bfd_get_symcount (abfd) * sizeof (struct nlist);
  exec_hdr (abfd)->a_entry = bfd_get_start_address (abfd);
  exec_hdr (abfd)->a_trsize = ((obj_textsec (abfd)->reloc_count) *
                               sizeof (struct relocation_info));
  exec_hdr (abfd)->a_drsize = ((obj_datasec (abfd)->reloc_count) *
                               sizeof (struct relocation_info));

  exec_hdr (abfd)->a_talign = obj_textsec (abfd)->alignment_power;
  exec_hdr (abfd)->a_dalign = obj_datasec (abfd)->alignment_power;
  exec_hdr (abfd)->a_balign = obj_bsssec (abfd)->alignment_power;

  exec_hdr (abfd)->a_tload = obj_textsec (abfd)->vma;
  exec_hdr (abfd)->a_dload = obj_datasec (abfd)->vma;

  bout_swap_exec_header_out (abfd, exec_hdr (abfd), &swapped_hdr);

  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
      || bfd_bwrite ((PTR) & swapped_hdr, (bfd_size_type) EXEC_BYTES_SIZE,
                    abfd) != EXEC_BYTES_SIZE)
    return FALSE;

  /* Now write out reloc info, followed by syms and strings.  */
  if (bfd_get_symcount (abfd) != 0)
    {
      if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (*exec_hdr (abfd))), SEEK_SET)
          != 0)
        return FALSE;

      if (!aout_32_write_syms (abfd))
        return FALSE;

      if (bfd_seek (abfd, (file_ptr) (N_TROFF (*exec_hdr (abfd))), SEEK_SET)
          != 0)
        return FALSE;

      if (!b_out_squirt_out_relocs (abfd, obj_textsec (abfd)))
        return FALSE;
      if (bfd_seek (abfd, (file_ptr) (N_DROFF (*exec_hdr (abfd))), SEEK_SET)
          != 0)
        return FALSE;

      if (!b_out_squirt_out_relocs (abfd, obj_datasec (abfd)))
        return FALSE;
    }
  return TRUE;
}