[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 (bfd_get_section_size (sec) == 0)
        continue;
      if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
        {
	  bfd_vma sec_vma = (bfd_get_section_vma (abfd, sec)
			     + bfd_get_section_size (sec));
	  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)
			      + bfd_get_section_size (sec));
	  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	{
911d08a7	86	if (bfd_get_section_size (sec) == 0)
252b5132 RH	87	continue;
	88	if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
	89	{
911d08a7 AM	90	bfd_vma sec_vma = (bfd_get_section_vma (abfd, sec)
911d08a7 AM	91	+ bfd_get_section_size (sec));
252b5132 RH	92	if (sec_vma > high_vma)
	93	high_vma = sec_vma;
	94	}
	95	if (bfd_get_section_flags (abfd, sec) & SEC_LOAD)
	96	{
911d08a7 AM	97	file_ptr sec_end = (sizeof (hdr)
	98	+ bfd_get_section_vma (abfd, sec)
	99	+ bfd_get_section_size (sec));
252b5132 RH	100	if (sec_end > outfile_size)
	101	outfile_size = sec_end;
	102	}
	103	}
	104
	105	/* Make sure the program isn't too big. */
	106	if (high_vma > (bfd_vma)0xffff)
	107	{
	108	bfd_set_error(bfd_error_file_too_big);
b34976b6	109	return FALSE;
252b5132 RH	110	}
252b5132 RH	111
e4b17274	112	/* Constants. */
dc810e39 AM	113	H_PUT_16 (abfd, EXE_MAGIC, &hdr[0]);
	114	H_PUT_16 (abfd, EXE_PAGE_SIZE / 16, &hdr[8]);
	115	H_PUT_16 (abfd, EXE_LOAD_LOW, &hdr[12]);
	116	H_PUT_16 (abfd, 0x3e, &hdr[24]);
	117	H_PUT_16 (abfd, 0x0001, &hdr[28]); /* XXX??? */
	118	H_PUT_16 (abfd, 0x30fb, &hdr[30]); /* XXX??? */
	119	H_PUT_16 (abfd, 0x726a, &hdr[32]); /* XXX??? */
252b5132	120
e4b17274	121	/* Bytes in last page (0 = full page). */
dc810e39	122	H_PUT_16 (abfd, outfile_size & (EXE_PAGE_SIZE - 1), &hdr[2]);
252b5132	123
e4b17274	124	/* Number of pages. */
dc810e39	125	H_PUT_16 (abfd, (outfile_size + EXE_PAGE_SIZE - 1) / EXE_PAGE_SIZE, &hdr[4]);
252b5132 RH	126
	127	/* Set the initial stack pointer to the end of the bss.
	128	The program's crt0 code must relocate it to a real stack. */
dc810e39	129	H_PUT_16 (abfd, high_vma, &hdr[16]);
252b5132 RH	130
252b5132 RH	131	if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
dc810e39	132	\|\| bfd_bwrite (hdr, (bfd_size_type) sizeof(hdr), abfd) != sizeof(hdr))
b34976b6	133	return FALSE;
252b5132	134
b34976b6	135	return TRUE;
252b5132 RH	136	}
252b5132 RH	137
b34976b6	138	static bfd_boolean
252b5132 RH	139	msdos_set_section_contents (abfd, section, location, offset, count)
	140	bfd *abfd;
	141	sec_ptr section;
0f867abe	142	const PTR location;
252b5132 RH	143	file_ptr offset;
	144	bfd_size_type count;
	145	{
	146
	147	if (count == 0)
b34976b6	148	return TRUE;
252b5132 RH	149
	150	section->filepos = EXE_PAGE_SIZE + bfd_get_section_vma (abfd, section);
	151
	152	if (bfd_get_section_flags (abfd, section) & SEC_LOAD)
	153	{
dc810e39 AM	154	if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0
dc810e39 AM	155	\|\| bfd_bwrite (location, count, abfd) != count)
b34976b6	156	return FALSE;
252b5132 RH	157	}
252b5132 RH	158
b34976b6	159	return TRUE;
252b5132 RH	160	}
	161
	162
	163
	164	#define msdos_mkobject aout_32_mkobject
	165	#define msdos_make_empty_symbol aout_32_make_empty_symbol
	166	#define msdos_bfd_reloc_type_lookup aout_32_reloc_type_lookup
	167
	168	#define msdos_close_and_cleanup _bfd_generic_close_and_cleanup
	169	#define msdos_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
	170	#define msdos_new_section_hook _bfd_generic_new_section_hook
	171	#define msdos_get_section_contents _bfd_generic_get_section_contents
	172	#define msdos_get_section_contents_in_window \
	173	_bfd_generic_get_section_contents_in_window
	174	#define msdos_bfd_get_relocated_section_contents \
	175	bfd_generic_get_relocated_section_contents
	176	#define msdos_bfd_relax_section bfd_generic_relax_section
	177	#define msdos_bfd_gc_sections bfd_generic_gc_sections
8550eb6e	178	#define msdos_bfd_merge_sections bfd_generic_merge_sections
72adc230	179	#define msdos_bfd_is_group_section bfd_generic_is_group_section
e61463e1	180	#define msdos_bfd_discard_group bfd_generic_discard_group
252b5132	181	#define msdos_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
e2d34d7d	182	#define msdos_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
252b5132	183	#define msdos_bfd_link_add_symbols _bfd_generic_link_add_symbols
2d653fc7	184	#define msdos_bfd_link_just_syms _bfd_generic_link_just_syms
252b5132 RH	185	#define msdos_bfd_final_link _bfd_generic_final_link
	186	#define msdos_bfd_link_split_section _bfd_generic_link_split_section
	187	#define msdos_set_arch_mach _bfd_generic_set_arch_mach
	188
	189	#define msdos_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
6cee3f79	190	#define msdos_canonicalize_symtab _bfd_nosymbols_canonicalize_symtab
252b5132 RH	191	#define msdos_print_symbol _bfd_nosymbols_print_symbol
	192	#define msdos_get_symbol_info _bfd_nosymbols_get_symbol_info
	193	#define msdos_find_nearest_line _bfd_nosymbols_find_nearest_line
	194	#define msdos_get_lineno _bfd_nosymbols_get_lineno
	195	#define msdos_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
	196	#define msdos_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
	197	#define msdos_read_minisymbols _bfd_nosymbols_read_minisymbols
	198	#define msdos_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
	199
	200	#define msdos_canonicalize_reloc _bfd_norelocs_canonicalize_reloc
	201	#define msdos_get_reloc_upper_bound _bfd_norelocs_get_reloc_upper_bound
	202	#define msdos_32_bfd_link_split_section _bfd_generic_link_split_section
	203
	204	const bfd_target i386msdos_vec =
252b5132	205	{
e4b17274 NC	206	"msdos", /* name */
	207	bfd_target_msdos_flavour,
	208	BFD_ENDIAN_LITTLE, /* target byte order */
	209	BFD_ENDIAN_LITTLE, /* target headers byte order */
	210	(EXEC_P), /* object flags */
	211	(SEC_CODE \| SEC_DATA \| SEC_HAS_CONTENTS
	212	\| SEC_ALLOC \| SEC_LOAD), /* section flags */
	213	0, /* leading underscore */
	214	' ', /* ar_pad_char */
	215	16, /* ar_max_namelen */
	216	bfd_getl64, bfd_getl_signed_64, bfd_putl64,
	217	bfd_getl32, bfd_getl_signed_32, bfd_putl32,
	218	bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
	219	bfd_getl64, bfd_getl_signed_64, bfd_putl64,
	220	bfd_getl32, bfd_getl_signed_32, bfd_putl32,
	221	bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
	222
	223	{
	224	_bfd_dummy_target,
	225	_bfd_dummy_target, /* bfd_check_format */
	226	_bfd_dummy_target,
	227	_bfd_dummy_target,
	228	},
	229	{
	230	bfd_false,
	231	msdos_mkobject,
	232	_bfd_generic_mkarchive,
	233	bfd_false,
	234	},
	235	{ /* bfd_write_contents */
	236	bfd_false,
	237	msdos_write_object_contents,
	238	_bfd_write_archive_contents,
	239	bfd_false,
	240	},
	241
	242	BFD_JUMP_TABLE_GENERIC (msdos),
	243	BFD_JUMP_TABLE_COPY (_bfd_generic),
	244	BFD_JUMP_TABLE_CORE (_bfd_nocore),
	245	BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
	246	BFD_JUMP_TABLE_SYMBOLS (msdos),
	247	BFD_JUMP_TABLE_RELOCS (msdos),
	248	BFD_JUMP_TABLE_WRITE (msdos),
	249	BFD_JUMP_TABLE_LINK (msdos),
	250	BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
	251
	252	NULL,
dc810e39	253
e4b17274 NC	254	(PTR) 0
e4b17274 NC	255	};
252b5132 RH	256
252b5132 RH	257