[deliverable/binutils-gdb.git] / bfd / i386msdos.c

/* BFD back-end for MS-DOS executables.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002,
   2003, 2004 Free Software Foundation, Inc.
   Written by Bryan Ford of the University of Utah.

   Contributed by the Center for Software Science at the
   University of Utah (pa-gdb-bugs@cs.utah.edu).

   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 "libaout.h"

#if 0
struct exe_header
{
  unsigned short magic;
  unsigned short bytes_in_last_page;
  unsigned short npages;	/* number of 512-byte "pages" including this header */
  unsigned short nrelocs;
  unsigned short header_paras;	/* number of 16-byte paragraphs in header */
  unsigned short reserved;
  unsigned short load_switch;
  unsigned short ss_ofs;
  unsigned short sp;
  unsigned short checksum;
  unsigned short ip;
  unsigned short cs_ofs;
  unsigned short reloc_ofs;
  unsigned short reserved2;
  unsigned short something1;
  unsigned short something2;
  unsigned short something3;
};
#endif

#define EXE_MAGIC	0x5a4d
#define EXE_LOAD_HIGH	0x0000
#define EXE_LOAD_LOW	0xffff
#define EXE_PAGE_SIZE	512

static int msdos_sizeof_headers
  PARAMS ((bfd *, bfd_boolean));
static bfd_boolean msdos_write_object_contents
  PARAMS ((bfd *));
static bfd_boolean msdos_set_section_contents
  PARAMS ((bfd *, sec_ptr, const PTR, file_ptr, bfd_size_type));

static int
msdos_sizeof_headers (abfd, exec)
     bfd *abfd ATTRIBUTE_UNUSED;
     bfd_boolean exec ATTRIBUTE_UNUSED;
{
  return 0;
}

static bfd_boolean
msdos_write_object_contents (abfd)
     bfd *abfd;
{
  static char hdr[EXE_PAGE_SIZE];
  file_ptr outfile_size = sizeof(hdr);
  bfd_vma high_vma = 0;
  asection *sec;

  /* Find the total size of the program on disk and in memory.  */
  for (sec = abfd->sections; sec != (asection *) NULL; sec = sec->next)
    {
      if (sec->size == 0)
        continue;
      if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
        {
	  bfd_vma sec_vma = bfd_get_section_vma (abfd, sec) + sec->size;
	  if (sec_vma > high_vma)
	    high_vma = sec_vma;
	}
      if (bfd_get_section_flags (abfd, sec) & SEC_LOAD)
        {
	  file_ptr sec_end = (sizeof (hdr)
			      + bfd_get_section_vma (abfd, sec)
			      + sec->size);
	  if (sec_end > outfile_size)
	    outfile_size = sec_end;
	}
    }

  /* Make sure the program isn't too big.  */
  if (high_vma > (bfd_vma)0xffff)
    {
      bfd_set_error(bfd_error_file_too_big);
      return FALSE;
    }

  /* Constants.  */
  H_PUT_16 (abfd, EXE_MAGIC, &hdr[0]);
  H_PUT_16 (abfd, EXE_PAGE_SIZE / 16, &hdr[8]);
  H_PUT_16 (abfd, EXE_LOAD_LOW, &hdr[12]);
  H_PUT_16 (abfd, 0x3e, &hdr[24]);
  H_PUT_16 (abfd, 0x0001, &hdr[28]); /* XXX??? */
  H_PUT_16 (abfd, 0x30fb, &hdr[30]); /* XXX??? */
  H_PUT_16 (abfd, 0x726a, &hdr[32]); /* XXX??? */

  /* Bytes in last page (0 = full page).  */
  H_PUT_16 (abfd, outfile_size & (EXE_PAGE_SIZE - 1), &hdr[2]);

  /* Number of pages.  */
  H_PUT_16 (abfd, (outfile_size + EXE_PAGE_SIZE - 1) / EXE_PAGE_SIZE, &hdr[4]);

  /* Set the initial stack pointer to the end of the bss.
     The program's crt0 code must relocate it to a real stack.  */
  H_PUT_16 (abfd, high_vma, &hdr[16]);

  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
      || bfd_bwrite (hdr, (bfd_size_type) sizeof(hdr), abfd) != sizeof(hdr))
    return FALSE;

  return TRUE;
}

static bfd_boolean
msdos_set_section_contents (abfd, section, location, offset, count)
     bfd *abfd;
     sec_ptr section;
     const PTR location;
     file_ptr offset;
     bfd_size_type count;
{

  if (count == 0)
    return TRUE;

  section->filepos = EXE_PAGE_SIZE + bfd_get_section_vma (abfd, section);

  if (bfd_get_section_flags (abfd, section) & SEC_LOAD)
    {
      if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0
          || bfd_bwrite (location, count, abfd) != count)
        return FALSE;
    }

  return TRUE;
}


#define msdos_mkobject aout_32_mkobject
#define msdos_make_empty_symbol aout_32_make_empty_symbol
#define msdos_bfd_reloc_type_lookup aout_32_reloc_type_lookup

#define	msdos_close_and_cleanup _bfd_generic_close_and_cleanup
#define msdos_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
#define msdos_new_section_hook _bfd_generic_new_section_hook
#define msdos_get_section_contents _bfd_generic_get_section_contents
#define msdos_get_section_contents_in_window \
  _bfd_generic_get_section_contents_in_window
#define msdos_bfd_get_relocated_section_contents \
  bfd_generic_get_relocated_section_contents
#define msdos_bfd_relax_section bfd_generic_relax_section
#define msdos_bfd_gc_sections bfd_generic_gc_sections
#define msdos_bfd_merge_sections bfd_generic_merge_sections
#define msdos_bfd_is_group_section bfd_generic_is_group_section
#define msdos_bfd_discard_group bfd_generic_discard_group
#define msdos_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
#define msdos_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
#define msdos_bfd_link_add_symbols _bfd_generic_link_add_symbols
#define msdos_bfd_link_just_syms _bfd_generic_link_just_syms
#define msdos_bfd_final_link _bfd_generic_final_link
#define msdos_bfd_link_split_section _bfd_generic_link_split_section
#define msdos_set_arch_mach _bfd_generic_set_arch_mach

#define msdos_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
#define msdos_canonicalize_symtab _bfd_nosymbols_canonicalize_symtab
#define msdos_print_symbol _bfd_nosymbols_print_symbol
#define msdos_get_symbol_info _bfd_nosymbols_get_symbol_info
#define msdos_find_nearest_line _bfd_nosymbols_find_nearest_line
#define msdos_get_lineno _bfd_nosymbols_get_lineno
#define msdos_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
#define msdos_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
#define msdos_read_minisymbols _bfd_nosymbols_read_minisymbols
#define msdos_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol

#define msdos_canonicalize_reloc _bfd_norelocs_canonicalize_reloc
#define msdos_get_reloc_upper_bound _bfd_norelocs_get_reloc_upper_bound
#define msdos_32_bfd_link_split_section  _bfd_generic_link_split_section

const bfd_target i386msdos_vec =
  {
    "msdos",			/* name */
    bfd_target_msdos_flavour,
    BFD_ENDIAN_LITTLE,		/* target byte order */
    BFD_ENDIAN_LITTLE,		/* target headers byte order */
    (EXEC_P),			/* object flags */
    (SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS
     | SEC_ALLOC | SEC_LOAD),	/* section flags */
    0,				/* leading underscore */
    ' ',				/* 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,
      _bfd_dummy_target,		/* bfd_check_format */
      _bfd_dummy_target,
      _bfd_dummy_target,
    },
    {
      bfd_false,
      msdos_mkobject,
      _bfd_generic_mkarchive,
      bfd_false,
    },
    {				/* bfd_write_contents */
      bfd_false,
      msdos_write_object_contents,
      _bfd_write_archive_contents,
      bfd_false,
    },

    BFD_JUMP_TABLE_GENERIC (msdos),
    BFD_JUMP_TABLE_COPY (_bfd_generic),
    BFD_JUMP_TABLE_CORE (_bfd_nocore),
    BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
    BFD_JUMP_TABLE_SYMBOLS (msdos),
    BFD_JUMP_TABLE_RELOCS (msdos),
    BFD_JUMP_TABLE_WRITE (msdos),
    BFD_JUMP_TABLE_LINK (msdos),
    BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

    NULL,

    (PTR) 0
  };
Commit	Line	Data
252b5132	1	/* BFD back-end for MS-DOS executables.
0f867abe	2	Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002,
72adc230	3	2003, 2004 Free Software Foundation, Inc.
252b5132 RH	4	Written by Bryan Ford of the University of Utah.
	5
	6	Contributed by the Center for Software Science at the
	7	University of Utah (pa-gdb-bugs@cs.utah.edu).
	8
	9	This file is part of BFD, the Binary File Descriptor library.
	10
	11	This program is free software; you can redistribute it and/or modify
	12	it under the terms of the GNU General Public License as published by
	13	the Free Software Foundation; either version 2 of the License, or
	14	(at your option) any later version.
	15
	16	This program is distributed in the hope that it will be useful,
	17	but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	GNU General Public License for more details.
	20
	21	You should have received a copy of the GNU General Public License
	22	along with this program; if not, write to the Free Software
	23	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
	24
	25
	26	#include "bfd.h"
	27	#include "sysdep.h"
	28	#include "libbfd.h"
	29	#include "libaout.h"
	30
	31	#if 0
	32	struct exe_header
	33	{
e4b17274 NC	34	unsigned short magic;
	35	unsigned short bytes_in_last_page;
	36	unsigned short npages; /* number of 512-byte "pages" including this header */
	37	unsigned short nrelocs;
	38	unsigned short header_paras; /* number of 16-byte paragraphs in header */
	39	unsigned short reserved;
	40	unsigned short load_switch;
	41	unsigned short ss_ofs;
	42	unsigned short sp;
	43	unsigned short checksum;
	44	unsigned short ip;
	45	unsigned short cs_ofs;
	46	unsigned short reloc_ofs;
	47	unsigned short reserved2;
	48	unsigned short something1;
	49	unsigned short something2;
	50	unsigned short something3;
252b5132 RH	51	};
	52	#endif
	53
	54	#define EXE_MAGIC 0x5a4d
	55	#define EXE_LOAD_HIGH 0x0000
	56	#define EXE_LOAD_LOW 0xffff
	57	#define EXE_PAGE_SIZE 512
	58
b34976b6 AM	59	static int msdos_sizeof_headers
	60	PARAMS ((bfd *, bfd_boolean));
	61	static bfd_boolean msdos_write_object_contents
	62	PARAMS ((bfd *));
	63	static bfd_boolean msdos_set_section_contents
0f867abe	64	PARAMS ((bfd *, sec_ptr, const PTR, file_ptr, bfd_size_type));
252b5132 RH	65
	66	static int
	67	msdos_sizeof_headers (abfd, exec)
5f771d47	68	bfd *abfd ATTRIBUTE_UNUSED;
b34976b6	69	bfd_boolean exec ATTRIBUTE_UNUSED;
252b5132 RH	70	{
	71	return 0;
	72	}
	73
b34976b6	74	static bfd_boolean
252b5132 RH	75	msdos_write_object_contents (abfd)
	76	bfd *abfd;
	77	{
	78	static char hdr[EXE_PAGE_SIZE];
	79	file_ptr outfile_size = sizeof(hdr);
	80	bfd_vma high_vma = 0;
	81	asection *sec;
	82
	83	/* Find the total size of the program on disk and in memory. */
	84	for (sec = abfd->sections; sec != (asection *) NULL; sec = sec->next)
	85	{
eea6121a	86	if (sec->size == 0)
252b5132 RH	87	continue;
	88	if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
	89	{
eea6121a	90	bfd_vma sec_vma = bfd_get_section_vma (abfd, sec) + sec->size;
252b5132 RH	91	if (sec_vma > high_vma)
	92	high_vma = sec_vma;
	93	}
	94	if (bfd_get_section_flags (abfd, sec) & SEC_LOAD)
	95	{
911d08a7 AM	96	file_ptr sec_end = (sizeof (hdr)
911d08a7 AM	97	+ bfd_get_section_vma (abfd, sec)
eea6121a	98	+ sec->size);
252b5132 RH	99	if (sec_end > outfile_size)
	100	outfile_size = sec_end;
	101	}
	102	}
	103
	104	/* Make sure the program isn't too big. */
	105	if (high_vma > (bfd_vma)0xffff)
	106	{
	107	bfd_set_error(bfd_error_file_too_big);
b34976b6	108	return FALSE;
252b5132 RH	109	}
252b5132 RH	110
e4b17274	111	/* Constants. */
dc810e39 AM	112	H_PUT_16 (abfd, EXE_MAGIC, &hdr[0]);
	113	H_PUT_16 (abfd, EXE_PAGE_SIZE / 16, &hdr[8]);
	114	H_PUT_16 (abfd, EXE_LOAD_LOW, &hdr[12]);
	115	H_PUT_16 (abfd, 0x3e, &hdr[24]);
	116	H_PUT_16 (abfd, 0x0001, &hdr[28]); /* XXX??? */
	117	H_PUT_16 (abfd, 0x30fb, &hdr[30]); /* XXX??? */
	118	H_PUT_16 (abfd, 0x726a, &hdr[32]); /* XXX??? */
252b5132	119
e4b17274	120	/* Bytes in last page (0 = full page). */
dc810e39	121	H_PUT_16 (abfd, outfile_size & (EXE_PAGE_SIZE - 1), &hdr[2]);
252b5132	122
e4b17274	123	/* Number of pages. */
dc810e39	124	H_PUT_16 (abfd, (outfile_size + EXE_PAGE_SIZE - 1) / EXE_PAGE_SIZE, &hdr[4]);
252b5132 RH	125
	126	/* Set the initial stack pointer to the end of the bss.
	127	The program's crt0 code must relocate it to a real stack. */
dc810e39	128	H_PUT_16 (abfd, high_vma, &hdr[16]);
252b5132 RH	129
252b5132 RH	130	if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
dc810e39	131	\|\| bfd_bwrite (hdr, (bfd_size_type) sizeof(hdr), abfd) != sizeof(hdr))
b34976b6	132	return FALSE;
252b5132	133
b34976b6	134	return TRUE;
252b5132 RH	135	}
252b5132 RH	136
b34976b6	137	static bfd_boolean
252b5132 RH	138	msdos_set_section_contents (abfd, section, location, offset, count)
	139	bfd *abfd;
	140	sec_ptr section;
0f867abe	141	const PTR location;
252b5132 RH	142	file_ptr offset;
	143	bfd_size_type count;
	144	{
	145
	146	if (count == 0)
b34976b6	147	return TRUE;
252b5132 RH	148
	149	section->filepos = EXE_PAGE_SIZE + bfd_get_section_vma (abfd, section);
	150
	151	if (bfd_get_section_flags (abfd, section) & SEC_LOAD)
	152	{
dc810e39 AM	153	if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0
dc810e39 AM	154	\|\| bfd_bwrite (location, count, abfd) != count)
b34976b6	155	return FALSE;
252b5132 RH	156	}
252b5132 RH	157
b34976b6	158	return TRUE;
252b5132 RH	159	}
	160
	161
	162
	163	#define msdos_mkobject aout_32_mkobject
	164	#define msdos_make_empty_symbol aout_32_make_empty_symbol
	165	#define msdos_bfd_reloc_type_lookup aout_32_reloc_type_lookup
	166
	167	#define msdos_close_and_cleanup _bfd_generic_close_and_cleanup
	168	#define msdos_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
	169	#define msdos_new_section_hook _bfd_generic_new_section_hook
	170	#define msdos_get_section_contents _bfd_generic_get_section_contents
	171	#define msdos_get_section_contents_in_window \
	172	_bfd_generic_get_section_contents_in_window
	173	#define msdos_bfd_get_relocated_section_contents \
	174	bfd_generic_get_relocated_section_contents
	175	#define msdos_bfd_relax_section bfd_generic_relax_section
	176	#define msdos_bfd_gc_sections bfd_generic_gc_sections
8550eb6e	177	#define msdos_bfd_merge_sections bfd_generic_merge_sections
72adc230	178	#define msdos_bfd_is_group_section bfd_generic_is_group_section
e61463e1	179	#define msdos_bfd_discard_group bfd_generic_discard_group
252b5132	180	#define msdos_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
e2d34d7d	181	#define msdos_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
252b5132	182	#define msdos_bfd_link_add_symbols _bfd_generic_link_add_symbols
2d653fc7	183	#define msdos_bfd_link_just_syms _bfd_generic_link_just_syms
252b5132 RH	184	#define msdos_bfd_final_link _bfd_generic_final_link
	185	#define msdos_bfd_link_split_section _bfd_generic_link_split_section
	186	#define msdos_set_arch_mach _bfd_generic_set_arch_mach
	187
	188	#define msdos_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
6cee3f79	189	#define msdos_canonicalize_symtab _bfd_nosymbols_canonicalize_symtab
252b5132 RH	190	#define msdos_print_symbol _bfd_nosymbols_print_symbol
	191	#define msdos_get_symbol_info _bfd_nosymbols_get_symbol_info
	192	#define msdos_find_nearest_line _bfd_nosymbols_find_nearest_line
	193	#define msdos_get_lineno _bfd_nosymbols_get_lineno
	194	#define msdos_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
	195	#define msdos_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
	196	#define msdos_read_minisymbols _bfd_nosymbols_read_minisymbols
	197	#define msdos_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
	198
	199	#define msdos_canonicalize_reloc _bfd_norelocs_canonicalize_reloc
	200	#define msdos_get_reloc_upper_bound _bfd_norelocs_get_reloc_upper_bound
	201	#define msdos_32_bfd_link_split_section _bfd_generic_link_split_section
	202
	203	const bfd_target i386msdos_vec =
252b5132	204	{
e4b17274 NC	205	"msdos", /* name */
	206	bfd_target_msdos_flavour,
	207	BFD_ENDIAN_LITTLE, /* target byte order */
	208	BFD_ENDIAN_LITTLE, /* target headers byte order */
	209	(EXEC_P), /* object flags */
	210	(SEC_CODE \| SEC_DATA \| SEC_HAS_CONTENTS
	211	\| SEC_ALLOC \| SEC_LOAD), /* section flags */
	212	0, /* leading underscore */
	213	' ', /* ar_pad_char */
	214	16, /* ar_max_namelen */
	215	bfd_getl64, bfd_getl_signed_64, bfd_putl64,
	216	bfd_getl32, bfd_getl_signed_32, bfd_putl32,
	217	bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
	218	bfd_getl64, bfd_getl_signed_64, bfd_putl64,
	219	bfd_getl32, bfd_getl_signed_32, bfd_putl32,
	220	bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
	221
	222	{
	223	_bfd_dummy_target,
	224	_bfd_dummy_target, /* bfd_check_format */
	225	_bfd_dummy_target,
	226	_bfd_dummy_target,
	227	},
	228	{
	229	bfd_false,
	230	msdos_mkobject,
	231	_bfd_generic_mkarchive,
	232	bfd_false,
	233	},
	234	{ /* bfd_write_contents */
	235	bfd_false,
	236	msdos_write_object_contents,
	237	_bfd_write_archive_contents,
	238	bfd_false,
	239	},
	240
	241	BFD_JUMP_TABLE_GENERIC (msdos),
	242	BFD_JUMP_TABLE_COPY (_bfd_generic),
	243	BFD_JUMP_TABLE_CORE (_bfd_nocore),
	244	BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
	245	BFD_JUMP_TABLE_SYMBOLS (msdos),
	246	BFD_JUMP_TABLE_RELOCS (msdos),
	247	BFD_JUMP_TABLE_WRITE (msdos),
	248	BFD_JUMP_TABLE_LINK (msdos),
	249	BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
	250
	251	NULL,
dc810e39	252
e4b17274 NC	253	(PTR) 0
e4b17274 NC	254	};
252b5132 RH	255
252b5132 RH	256