binutils-gdb/bfd/i386os9k.c

/* BFD back-end for os9000 i386 binaries.
   Copyright 1990, 1991, 1992, 1993 1994 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., 675 Mass Ave, Cambridge, MA 02139, 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 bfd_target *os9k_callback PARAMS ((bfd *));

/* Swaps the information in an executable header taken from a raw byte
   stream memory image, into the internal exec_header structure.  */
void
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 = bfd_h_get_16 (abfd, bytes->m_sync);
  execp->a_syms = 0;
  execp->a_entry = bfd_h_get_32 (abfd, bytes->m_exec);
  execp->a_talign = 2;
  execp->a_dalign = 2;
  execp->a_balign = 2;

  dload = bfd_h_get_32 (abfd, bytes->m_idata);
  execp->a_data = dload + 8;

  bfd_seek (abfd, (file_ptr) dload, SEEK_SET);
  bfd_read (&dmemstart, sizeof (dmemstart), 1, abfd);
  bfd_read (&dmemsize, sizeof (dmemsize), 1, abfd);

  execp->a_tload = 0;
  execp->a_dload = bfd_h_get_32 (abfd, (unsigned char *) &dmemstart);
  execp->a_text = dload - execp->a_tload;
  execp->a_data = bfd_h_get_32 (abfd, (unsigned char *) &dmemsize);
  execp->a_bss = bfd_h_get_32 (abfd, bytes->m_data) - execp->a_data;

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

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

PROTO (void, os9k_swap_exec_header_out,
         (bfd * abfd,
	  struct internal_exec * execp,
	  struct mh_com * raw_bytes));
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. */
  bfd_h_put_32 (abfd, execp->a_info, bytes->e_info);
  bfd_h_put_32 (abfd, execp->a_text, bytes->e_text);
  bfd_h_put_32 (abfd, execp->a_data, bytes->e_data);
  bfd_h_put_32 (abfd, execp->a_bss, bytes->e_bss);
  bfd_h_put_32 (abfd, execp->a_syms, bytes->e_syms);
  bfd_h_put_32 (abfd, execp->a_entry, bytes->e_entry);
  bfd_h_put_32 (abfd, execp->a_trsize, bytes->e_trsize);
  bfd_h_put_32 (abfd, execp->a_drsize, bytes->e_drsize);
  bfd_h_put_32 (abfd, execp->a_tload, bytes->e_tload);
  bfd_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 bfd_target *
os9k_object_p (abfd)
     bfd *abfd;
{
  struct internal_exec anexec;
  mh_com exec_bytes;

  if (bfd_read ((PTR) & exec_bytes, MHCOM_BYTES_SIZE, 1, abfd)
      != MHCOM_BYTES_SIZE)
    {
      bfd_set_error (bfd_error_wrong_format);
      return 0;
    }

  anexec.a_info = bfd_h_get_16 (abfd, exec_bytes.m_sync);
  if (N_BADMAG (anexec))
    {
      bfd_set_error (bfd_error_wrong_format);
      return 0;
    }

  os9k_swap_exec_header_in (abfd, &exec_bytes, &anexec);
  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 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 boolean
os9k_mkobject (abfd)
     bfd *abfd;
{
  struct bout_data_struct *rawptr;

  rawptr = (struct bout_data_struct *) bfd_zalloc (abfd, sizeof (struct bout_data_struct));
  if (rawptr == NULL)
    {
      bfd_set_error (bfd_error_no_memory);
      return false;
    }

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

  /* For simplicity's sake we just make all the sections right here. */
  obj_textsec (abfd) = (asection *) NULL;
  obj_datasec (abfd) = (asection *) NULL;
  obj_bsssec (abfd) = (asection *) NULL;

  bfd_make_section (abfd, ".text");
  bfd_make_section (abfd, ".data");
  bfd_make_section (abfd, ".bss");

  return true;
}

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

  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);

  bfd_seek (abfd, (file_ptr) 0, SEEK_SET);
  bfd_write ((PTR) & swapped_hdr, 1, EXEC_BYTES_SIZE, abfd);

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

      if (!aout_32_write_syms (abfd))
	return false;

      bfd_seek (abfd, (file_ptr) (N_TROFF (*exec_hdr (abfd))), SEEK_SET);

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

      if (!b_out_squirt_out_relocs (abfd, obj_datasec (abfd)))
	return false;
    }
  return true;
}

static boolean
os9k_set_section_contents (abfd, section, location, offset, count)
     bfd *abfd;
     sec_ptr section;
     unsigned char *location;
     file_ptr offset;
     int count;
{

  if (abfd->output_has_begun == false)
    {				/* set by bfd.c handler */
      if ((obj_textsec (abfd) == NULL) || (obj_datasec (abfd) == NULL)	/*||
	          (obj_textsec (abfd)->_cooked_size == 0) || (obj_datasec (abfd)->_cooked_size == 0)*/ )
	{
	  bfd_set_error (bfd_error_invalid_operation);
	  return false;
	}

      obj_textsec (abfd)->filepos = sizeof (struct internal_exec);
      obj_datasec (abfd)->filepos = obj_textsec (abfd)->filepos
	+ obj_textsec (abfd)->_raw_size;

    }
  /* regardless, once we know what we're doing, we might as well get going */
  bfd_seek (abfd, section->filepos + offset, SEEK_SET);

  if (count != 0)
    {
      return (bfd_write ((PTR) location, 1, count, abfd) == count) ? true : false;
    }
  return true;
}
#endif	/* 0 */

static int
os9k_sizeof_headers (ignore_abfd, ignore)
     bfd *ignore_abfd;
     boolean ignore;
{
  return sizeof (struct internal_exec);
}


/***********************************************************************/

/* We don't have core files.  */
#define	aout_32_core_file_failing_command _bfd_dummy_core_file_failing_command
#define	aout_32_core_file_failing_signal _bfd_dummy_core_file_failing_signal
#define	aout_32_core_file_matches_executable_p	\
				_bfd_dummy_core_file_matches_executable_p

/* We use BSD-Unix generic archive files.  */
#define	aout_32_openr_next_archived_file	bfd_generic_openr_next_archived_file
#define	aout_32_generic_stat_arch_elt	bfd_generic_stat_arch_elt
#define	aout_32_slurp_armap		bfd_slurp_bsd_armap
#define	aout_32_slurp_extended_name_table	_bfd_slurp_extended_name_table
#define	aout_32_write_armap		bsd_write_armap
#define	aout_32_truncate_arname		bfd_bsd_truncate_arname

/* We override these routines from the usual a.out file routines.  */
#define	aout_32_canonicalize_reloc	bfd_canonicalize_reloc
#define	aout_32_get_reloc_upper_bound	bfd_get_reloc_upper_bound
#define	aout_32_set_section_contents	bfd_set_section_contents
#define	aout_32_set_arch_mach		bfd_default_set_arch_mach
#define	aout_32_sizeof_headers		os9k_sizeof_headers

#define aout_32_bfd_debug_info_start		bfd_void
#define aout_32_bfd_debug_info_end		bfd_void
#define aout_32_bfd_debug_info_accumulate	(PROTO(void,(*),(bfd*, struct sec *))) bfd_void

#define aout_32_bfd_make_debug_symbol \
  ((asymbol *(*) PARAMS ((bfd *, void *, unsigned long))) bfd_nullvoidptr)
#define aout_32_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
#define aout_32_bfd_link_add_symbols _bfd_generic_link_add_symbols
#define aout_32_bfd_final_link _bfd_generic_final_link
#define aout_32_bfd_get_relocated_section_contents  bfd_generic_get_relocated_section_contents
#define aout_32_bfd_relax_section                   bfd_generic_relax_section
#define aout_32_bfd_reloc_type_lookup \
  ((CONST struct reloc_howto_struct *(*) PARAMS \
((bfd *, bfd_reloc_code_real_type))) bfd_nullvoidptr)
#define aout_32_bfd_free_cached_info bfd_true

bfd_target i386os9k_vec =
{
  "i386os9k",			/* name */
  bfd_target_os9k_flavour,
  false,			/* data byte order is little */
  false,			/* hdr byte order is big */
  (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 */
  2,				/* minumum alignment power */

  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},

  JUMP_TABLE (aout_32),
  (PTR) 0,
};