257 lines
8.2 KiB
C
257 lines
8.2 KiB
C
|
/* BFD back-end for MS-DOS executables.
|
||
|
|
Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002,
|
||
|
|
2003 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_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 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_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
|
||
|
|
};
|
||
|
|
|
||
|
|
|