[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
   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 *, boolean));
static boolean msdos_write_object_contents PARAMS ((bfd *));
static boolean msdos_set_section_contents PARAMS ((bfd *, sec_ptr, PTR, file_ptr, bfd_size_type));

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

static 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_before_reloc (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_before_reloc (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_before_reloc (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 boolean
msdos_set_section_contents (abfd, section, location, offset, count)
     bfd *abfd;
     sec_ptr section;
     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_link_hash_table_create _bfd_generic_link_hash_table_create
#define msdos_bfd_link_add_symbols _bfd_generic_link_add_symbols
#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_get_symtab _bfd_nosymbols_get_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.
e4b17274	2	Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001
5f771d47	3	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
e4b17274 NC	59	static int msdos_sizeof_headers PARAMS ((bfd *, boolean));
	60	static boolean msdos_write_object_contents PARAMS ((bfd *));
	61	static boolean msdos_set_section_contents PARAMS ((bfd *, sec_ptr, PTR, file_ptr, bfd_size_type));
252b5132 RH	62
	63	static int
	64	msdos_sizeof_headers (abfd, exec)
5f771d47 ILT	65	bfd *abfd ATTRIBUTE_UNUSED;
5f771d47 ILT	66	boolean exec ATTRIBUTE_UNUSED;
252b5132 RH	67	{
	68	return 0;
	69	}
	70
	71	static boolean
	72	msdos_write_object_contents (abfd)
	73	bfd *abfd;
	74	{
	75	static char hdr[EXE_PAGE_SIZE];
	76	file_ptr outfile_size = sizeof(hdr);
	77	bfd_vma high_vma = 0;
	78	asection *sec;
	79
	80	/* Find the total size of the program on disk and in memory. */
	81	for (sec = abfd->sections; sec != (asection *) NULL; sec = sec->next)
	82	{
	83	if (bfd_get_section_size_before_reloc (sec) == 0)
	84	continue;
	85	if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
	86	{
	87	bfd_vma sec_vma = bfd_get_section_vma (abfd, sec)
	88	+ bfd_get_section_size_before_reloc (sec);
	89	if (sec_vma > high_vma)
	90	high_vma = sec_vma;
	91	}
	92	if (bfd_get_section_flags (abfd, sec) & SEC_LOAD)
	93	{
	94	file_ptr sec_end = sizeof(hdr)
	95	+ bfd_get_section_vma (abfd, sec)
	96	+ bfd_get_section_size_before_reloc (sec);
	97	if (sec_end > outfile_size)
	98	outfile_size = sec_end;
	99	}
	100	}
	101
	102	/* Make sure the program isn't too big. */
	103	if (high_vma > (bfd_vma)0xffff)
	104	{
	105	bfd_set_error(bfd_error_file_too_big);
	106	return false;
	107	}
	108
e4b17274	109	/* Constants. */
dc810e39 AM	110	H_PUT_16 (abfd, EXE_MAGIC, &hdr[0]);
	111	H_PUT_16 (abfd, EXE_PAGE_SIZE / 16, &hdr[8]);
	112	H_PUT_16 (abfd, EXE_LOAD_LOW, &hdr[12]);
	113	H_PUT_16 (abfd, 0x3e, &hdr[24]);
	114	H_PUT_16 (abfd, 0x0001, &hdr[28]); /* XXX??? */
	115	H_PUT_16 (abfd, 0x30fb, &hdr[30]); /* XXX??? */
	116	H_PUT_16 (abfd, 0x726a, &hdr[32]); /* XXX??? */
252b5132	117
e4b17274	118	/* Bytes in last page (0 = full page). */
dc810e39	119	H_PUT_16 (abfd, outfile_size & (EXE_PAGE_SIZE - 1), &hdr[2]);
252b5132	120
e4b17274	121	/* Number of pages. */
dc810e39	122	H_PUT_16 (abfd, (outfile_size + EXE_PAGE_SIZE - 1) / EXE_PAGE_SIZE, &hdr[4]);
252b5132 RH	123
	124	/* Set the initial stack pointer to the end of the bss.
	125	The program's crt0 code must relocate it to a real stack. */
dc810e39	126	H_PUT_16 (abfd, high_vma, &hdr[16]);
252b5132 RH	127
252b5132 RH	128	if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
dc810e39	129	\|\| bfd_bwrite (hdr, (bfd_size_type) sizeof(hdr), abfd) != sizeof(hdr))
252b5132 RH	130	return false;
	131
	132	return true;
	133	}
	134
	135	static boolean
	136	msdos_set_section_contents (abfd, section, location, offset, count)
	137	bfd *abfd;
	138	sec_ptr section;
	139	PTR location;
	140	file_ptr offset;
	141	bfd_size_type count;
	142	{
	143
	144	if (count == 0)
	145	return true;
	146
	147	section->filepos = EXE_PAGE_SIZE + bfd_get_section_vma (abfd, section);
	148
	149	if (bfd_get_section_flags (abfd, section) & SEC_LOAD)
	150	{
dc810e39 AM	151	if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0
dc810e39 AM	152	\|\| bfd_bwrite (location, count, abfd) != count)
252b5132 RH	153	return false;
	154	}
	155
	156	return true;
	157	}
	158
	159
	160
	161	#define msdos_mkobject aout_32_mkobject
	162	#define msdos_make_empty_symbol aout_32_make_empty_symbol
	163	#define msdos_bfd_reloc_type_lookup aout_32_reloc_type_lookup
	164
	165	#define msdos_close_and_cleanup _bfd_generic_close_and_cleanup
	166	#define msdos_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
	167	#define msdos_new_section_hook _bfd_generic_new_section_hook
	168	#define msdos_get_section_contents _bfd_generic_get_section_contents
	169	#define msdos_get_section_contents_in_window \
	170	_bfd_generic_get_section_contents_in_window
	171	#define msdos_bfd_get_relocated_section_contents \
	172	bfd_generic_get_relocated_section_contents
	173	#define msdos_bfd_relax_section bfd_generic_relax_section
	174	#define msdos_bfd_gc_sections bfd_generic_gc_sections
8550eb6e	175	#define msdos_bfd_merge_sections bfd_generic_merge_sections
252b5132 RH	176	#define msdos_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
	177	#define msdos_bfd_link_add_symbols _bfd_generic_link_add_symbols
	178	#define msdos_bfd_final_link _bfd_generic_final_link
	179	#define msdos_bfd_link_split_section _bfd_generic_link_split_section
	180	#define msdos_set_arch_mach _bfd_generic_set_arch_mach
	181
	182	#define msdos_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
	183	#define msdos_get_symtab _bfd_nosymbols_get_symtab
	184	#define msdos_print_symbol _bfd_nosymbols_print_symbol
	185	#define msdos_get_symbol_info _bfd_nosymbols_get_symbol_info
	186	#define msdos_find_nearest_line _bfd_nosymbols_find_nearest_line
	187	#define msdos_get_lineno _bfd_nosymbols_get_lineno
	188	#define msdos_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
	189	#define msdos_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
	190	#define msdos_read_minisymbols _bfd_nosymbols_read_minisymbols
	191	#define msdos_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
	192
	193	#define msdos_canonicalize_reloc _bfd_norelocs_canonicalize_reloc
	194	#define msdos_get_reloc_upper_bound _bfd_norelocs_get_reloc_upper_bound
	195	#define msdos_32_bfd_link_split_section _bfd_generic_link_split_section
	196
	197	const bfd_target i386msdos_vec =
252b5132	198	{
e4b17274 NC	199	"msdos", /* name */
	200	bfd_target_msdos_flavour,
	201	BFD_ENDIAN_LITTLE, /* target byte order */
	202	BFD_ENDIAN_LITTLE, /* target headers byte order */
	203	(EXEC_P), /* object flags */
	204	(SEC_CODE \| SEC_DATA \| SEC_HAS_CONTENTS
	205	\| SEC_ALLOC \| SEC_LOAD), /* section flags */
	206	0, /* leading underscore */
	207	' ', /* ar_pad_char */
	208	16, /* ar_max_namelen */
	209	bfd_getl64, bfd_getl_signed_64, bfd_putl64,
	210	bfd_getl32, bfd_getl_signed_32, bfd_putl32,
	211	bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
	212	bfd_getl64, bfd_getl_signed_64, bfd_putl64,
	213	bfd_getl32, bfd_getl_signed_32, bfd_putl32,
	214	bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
	215
	216	{
	217	_bfd_dummy_target,
	218	_bfd_dummy_target, /* bfd_check_format */
	219	_bfd_dummy_target,
	220	_bfd_dummy_target,
	221	},
	222	{
	223	bfd_false,
	224	msdos_mkobject,
	225	_bfd_generic_mkarchive,
	226	bfd_false,
	227	},
	228	{ /* bfd_write_contents */
	229	bfd_false,
	230	msdos_write_object_contents,
	231	_bfd_write_archive_contents,
	232	bfd_false,
	233	},
	234
	235	BFD_JUMP_TABLE_GENERIC (msdos),
	236	BFD_JUMP_TABLE_COPY (_bfd_generic),
	237	BFD_JUMP_TABLE_CORE (_bfd_nocore),
	238	BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
	239	BFD_JUMP_TABLE_SYMBOLS (msdos),
	240	BFD_JUMP_TABLE_RELOCS (msdos),
	241	BFD_JUMP_TABLE_WRITE (msdos),
	242	BFD_JUMP_TABLE_LINK (msdos),
	243	BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
	244
	245	NULL,
dc810e39	246
e4b17274 NC	247	(PTR) 0
e4b17274 NC	248	};
252b5132 RH	249
252b5132 RH	250