/* BFD backend for local host's a.out binaries */

/* Copyright (C) 1990, 1991 Free Software Foundation, Inc.

This file is part of BFD, the Binary File Diddler.

BFD 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 1, or (at your option)
any later version.

BFD 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 BFD; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <ansidecl.h>
#include <sysdep.h>
#include "bfd.h"
#include "libbfd.h"

#include <a.out.h>
#include "liba.out.h"           /* BFD a.out internal data structures */

#include "trad-core.h"		/* Traditional Unix core files */

void (*bfd_error_trap)();

static bfd_target *host_aout_callback ();

/*SUPPRESS558*/
/*SUPPRESS529*/

bfd_target *
host_aout_object_p (abfd)
     bfd *abfd;
{
  unsigned char magicbuf[4];	/* Raw bytes of magic number from file */
  unsigned long magic;		/* Swapped magic number */

  bfd_error = system_call_error;

  if (bfd_read ((PTR)magicbuf, 1, sizeof (magicbuf), abfd) !=
      sizeof (magicbuf))
    return 0;
  magic = bfd_h_getlong (abfd, magicbuf);

  if (N_BADMAG (*((struct exec *) &magic))) return 0;

  return some_aout_object_p (abfd, host_aout_callback);
}

/* Set parameters about this a.out file that are machine-dependent.
   This routine is called from some_aout_object_p just before it returns.  */

static bfd_target *
host_aout_callback (abfd)
     bfd *abfd;
{
  struct exec *execp = exec_hdr (abfd);

  /* The virtual memory addresses of the sections */
  obj_datasec (abfd)->vma = N_DATADDR(*execp);
  obj_bsssec (abfd)->vma = N_BSSADDR(*execp);
  obj_textsec (abfd)->vma = N_TXTADDR(*execp);

  /* The file offsets of the sections */
  obj_textsec (abfd)->filepos = N_TXTOFF(*execp);
  obj_datasec (abfd)->filepos = N_DATOFF(*execp);

  /* The file offsets of the relocation info */
  obj_textsec (abfd)->rel_filepos = N_TRELOFF(*execp);
  obj_datasec (abfd)->rel_filepos = N_DRELOFF(*execp);

  /* The file offsets of the string table and symbol table.  */
  obj_str_filepos (abfd) = N_STROFF (*execp);
  obj_sym_filepos (abfd) = N_SYMOFF (*execp);

#ifdef HOST_MACHINE_ARCH
  abfd->obj_arch = HOST_MACHINE_ARCH;
#endif
#ifdef HOST_MACHINE_MACHINE
  abfd->obj_machine = HOST_MACHINE_MACHINE;
#endif

  return abfd->xvec;
}


boolean
host_aout_mkobject (abfd)
     bfd *abfd;
{
  char *rawptr;

  bfd_error = system_call_error;

  /* Use an intermediate variable for clarity */
  rawptr = bfd_zalloc (abfd, sizeof (struct aoutdata) + sizeof (struct exec));

  if (rawptr == NULL) {
    bfd_error = no_memory;
    return false;
  }

  set_tdata (abfd, (struct aoutdata *) rawptr);
  exec_hdr (abfd) = (struct exec *) (rawptr + sizeof (struct aoutdata));

  /* 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;
}

/* Write an object file in host a.out format.
   Section contents have already been written.  We write the
   file header, symbols, and relocation.  */

boolean
host_aout_write_object_contents (abfd)
     bfd *abfd;
{
/* This works because we are on the host system */
#define	EXEC_BYTES_SIZE	sizeof (struct exec)
  size_t data_pad = 0;
  unsigned char exec_bytes[EXEC_BYTES_SIZE];
  struct exec *execp = exec_hdr (abfd);

  execp->a_text = obj_textsec (abfd)->size;


  N_SET_MAGIC (*execp, OMAGIC);
  if (abfd->flags & D_PAGED) {
    /* This is not strictly true, but will probably do for the default
	case.  FIXME.  
	*/

    execp->a_text = obj_textsec (abfd)->size + EXEC_BYTES_SIZE;
    N_SET_MAGIC (*execp, ZMAGIC);
  } else if (abfd->flags & WP_TEXT) {
    N_SET_MAGIC (*execp, NMAGIC);
  }
  N_SET_FLAGS (*execp, 0x1);	/* copied from ld.c; who the hell knows? */

  if (abfd->flags & D_PAGED) 
      {
	data_pad = ((obj_datasec(abfd)->size + PAGE_SIZE -1)
		    & (- PAGE_SIZE)) - obj_datasec(abfd)->size;

	if (data_pad > obj_bsssec(abfd)->size)
	  execp->a_bss = 0;
	else 
	  execp->a_bss = obj_bsssec(abfd)->size - data_pad;
	execp->a_data = obj_datasec(abfd)->size + data_pad;

      }
  else {
    execp->a_data = obj_datasec (abfd)->size;
    execp->a_bss = obj_bsssec (abfd)->size;
  }

  execp->a_syms = bfd_get_symcount (abfd) * sizeof (struct nlist);
  execp->a_entry = bfd_get_start_address (abfd);

  execp->a_trsize = ((obj_textsec (abfd)->reloc_count) *
		     obj_reloc_entry_size (abfd));
		       
  execp->a_drsize = ((obj_datasec (abfd)->reloc_count) *
		     obj_reloc_entry_size (abfd));

  bfd_aout_swap_exec_header_out (abfd, execp, exec_bytes);

  bfd_seek (abfd, 0L, false);
  bfd_write ((PTR) exec_bytes, 1, EXEC_BYTES_SIZE, abfd);

  /* Now write out reloc info, followed by syms and strings */

  if (bfd_get_symcount (abfd) != 0) 
    {
      bfd_seek (abfd,
		(long)(N_SYMOFF(*execp)), false);

      aout_write_syms (abfd);

      bfd_seek (abfd,	(long)(N_TRELOFF(*execp)), false);

      if (!aout_squirt_out_relocs (abfd, obj_textsec (abfd))) return false;
      bfd_seek (abfd, (long)(N_DRELOFF(*execp)), false);

      if (!aout_squirt_out_relocs (abfd, obj_datasec (abfd))) return false;
    }
  return true;
}

/* We use BFD generic archive files.  */
#define	aout_openr_next_archived_file	bfd_generic_openr_next_archived_file
#define	aout_generic_stat_arch_elt	bfd_generic_stat_arch_elt
#define	aout_slurp_armap		bfd_slurp_bsd_armap
#define	aout_slurp_extended_name_table	bfd_true
#define	aout_write_armap		bsd_write_armap
#define	aout_truncate_arname		bfd_bsd_truncate_arname

/* We use traditional Unix core file format.  */
#define	aout_core_file_failing_command	trad_unix_core_file_failing_command
#define	aout_core_file_failing_signal	trad_unix_core_file_failing_signal
#define	aout_core_file_matches_executable_p	\
					trad_unix_core_file_matches_executable_p

/* We replace this function */
#define	aout_write_object_contents	host_aout_write_object_contents

bfd_target host_aout_big_vec =
{
  "a.out-host-big",		/* name */
  bfd_target_aout_flavour_enum,
  true,				/* target byte order */
  true,				/* target headers byte order */
  (HAS_RELOC | EXEC_P |		/* object flags */
   HAS_LINENO | HAS_DEBUG |
   HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
  ' ',				/* ar_pad_char */
  16,				/* ar_max_namelen */
  _do_getblong, _do_putblong, _do_getbshort, _do_putbshort, /* data */
  _do_getblong, _do_putblong, _do_getbshort, _do_putbshort, /* hdrs */

    {_bfd_dummy_target, host_aout_object_p,
       bfd_generic_archive_p, trad_unix_core_file_p},
    {bfd_false, host_aout_mkobject,
       _bfd_generic_mkarchive, bfd_false},
    {bfd_false, aout_write_object_contents,	/* bfd_write_contents */
       _bfd_write_archive_contents, bfd_false},

  JUMP_TABLE(aout)
};

bfd_target host_aout_little_vec =
{
  "a.out-host-little",		/* name */
  bfd_target_aout_flavour_enum,
  false,			/* target byte order */
  false,			/* target headers byte order */
  (HAS_RELOC | EXEC_P |		/* object flags */
   HAS_LINENO | HAS_DEBUG |
   HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
  ' ',				/* ar_pad_char */
  16,				/* ar_max_namelen */
  _do_getllong, _do_putllong, _do_getlshort, _do_putlshort, /* data */
  _do_getllong, _do_putllong, _do_getlshort, _do_putlshort, /* hdrs */

    {_bfd_dummy_target, host_aout_object_p,
       bfd_generic_archive_p, trad_unix_core_file_p},
    {bfd_false, host_aout_mkobject,
       _bfd_generic_mkarchive, bfd_false},
    {bfd_false, aout_write_object_contents,	/* bfd_write_contents */
       _bfd_write_archive_contents, bfd_false},

  JUMP_TABLE(aout)
};