binutils-gdb/bfd/i386os9k.c

/* BFD back-end for os9000 i386 binaries.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2001, 2002,
   2004, 2005, 2006 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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"

/* Swaps the information in an executable header taken from a raw byte
   stream memory image, into the internal exec_header structure.  */
static bfd_boolean
os9k_swap_exec_header_in (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;
}


/* 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 (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)->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;
}

static const bfd_target *
os9k_object_p (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);
}

static int
os9k_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
		     struct bfd_link_info *info ATTRIBUTE_UNUSED)
{
  return sizeof (struct internal_exec);
}



#define aout_32_close_and_cleanup aout_32_bfd_free_cached_info

#define aout_32_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol

#define aout_32_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup

#define aout_32_get_section_contents_in_window \
  _bfd_generic_get_section_contents_in_window

#define os9k_bfd_get_relocated_section_contents \
  bfd_generic_get_relocated_section_contents
#define os9k_bfd_relax_section bfd_generic_relax_section
#define os9k_bfd_gc_sections bfd_generic_gc_sections
#define os9k_bfd_merge_sections bfd_generic_merge_sections
#define os9k_bfd_is_group_section bfd_generic_is_group_section
#define os9k_bfd_discard_group bfd_generic_discard_group
#define os9k_section_already_linked \
  _bfd_generic_section_already_linked
#define os9k_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
#define os9k_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
#define os9k_bfd_link_add_symbols _bfd_generic_link_add_symbols
#define os9k_bfd_link_just_syms _bfd_generic_link_just_syms
#define os9k_bfd_final_link _bfd_generic_final_link
#define os9k_bfd_link_split_section  _bfd_generic_link_split_section

const bfd_target i386os9k_vec =
  {
    "i386os9k",			/* name */
    bfd_target_os9k_flavour,
    BFD_ENDIAN_LITTLE,		/* data byte order is little */
    BFD_ENDIAN_LITTLE,		/* hdr byte order is little */
    (HAS_RELOC | EXEC_P | WP_TEXT),	/* object flags */
    (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD),	/* section flags */
    0,				/* symbol leading char */
    ' ',				/* ar_pad_char */
    16,				/* ar_max_namelen */

    bfd_getl64, bfd_getl_signed_64, bfd_putl64,
    bfd_getl32, bfd_getl_signed_32, bfd_putl32,
    bfd_getl16, bfd_getl_signed_16, bfd_putl16,	/* data */
    bfd_getl64, bfd_getl_signed_64, bfd_putl64,
    bfd_getl32, bfd_getl_signed_32, bfd_putl32,
    bfd_getl16, bfd_getl_signed_16, bfd_putl16,	/* hdrs */
    {_bfd_dummy_target, os9k_object_p,	/* bfd_check_format */
     bfd_generic_archive_p, _bfd_dummy_target},
    {bfd_false, bfd_false,	/* bfd_set_format */
     _bfd_generic_mkarchive, bfd_false},
    {bfd_false, bfd_false,	/* bfd_write_contents */
     _bfd_write_archive_contents, bfd_false},

    BFD_JUMP_TABLE_GENERIC (aout_32),
    BFD_JUMP_TABLE_COPY (_bfd_generic),
    BFD_JUMP_TABLE_CORE (_bfd_nocore),
    BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
    BFD_JUMP_TABLE_SYMBOLS (aout_32),
    BFD_JUMP_TABLE_RELOCS (aout_32),
    BFD_JUMP_TABLE_WRITE (aout_32),
    BFD_JUMP_TABLE_LINK (os9k),
    BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

    NULL,

    (PTR) 0,
  };