1 /* BFD back-end for MS-DOS executables.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999
3 Free Software Foundation, Inc.
4 Written by Bryan Ford of the University of Utah.
6 Contributed by the Center for Software Science at the
7 University of Utah (pa-gdb-bugs@cs.utah.edu).
9 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
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
;
43 unsigned short checksum
;
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
;
54 #define EXE_MAGIC 0x5a4d
55 #define EXE_LOAD_HIGH 0x0000
56 #define EXE_LOAD_LOW 0xffff
57 #define EXE_PAGE_SIZE 512
61 msdos_sizeof_headers (abfd
, exec
)
62 bfd
*abfd ATTRIBUTE_UNUSED
;
63 boolean exec ATTRIBUTE_UNUSED
;
69 msdos_write_object_contents (abfd
)
72 static char hdr
[EXE_PAGE_SIZE
];
73 file_ptr outfile_size
= sizeof(hdr
);
77 /* Find the total size of the program on disk and in memory. */
78 for (sec
= abfd
->sections
; sec
!= (asection
*) NULL
; sec
= sec
->next
)
80 if (bfd_get_section_size_before_reloc (sec
) == 0)
82 if (bfd_get_section_flags (abfd
, sec
) & SEC_ALLOC
)
84 bfd_vma sec_vma
= bfd_get_section_vma (abfd
, sec
)
85 + bfd_get_section_size_before_reloc (sec
);
86 if (sec_vma
> high_vma
)
89 if (bfd_get_section_flags (abfd
, sec
) & SEC_LOAD
)
91 file_ptr sec_end
= sizeof(hdr
)
92 + bfd_get_section_vma (abfd
, sec
)
93 + bfd_get_section_size_before_reloc (sec
);
94 if (sec_end
> outfile_size
)
95 outfile_size
= sec_end
;
99 /* Make sure the program isn't too big. */
100 if (high_vma
> (bfd_vma
)0xffff)
102 bfd_set_error(bfd_error_file_too_big
);
107 bfd_h_put_16(abfd
, EXE_MAGIC
, &hdr
[0]);
108 bfd_h_put_16(abfd
, EXE_PAGE_SIZE
/ 16, &hdr
[8]);
109 bfd_h_put_16(abfd
, EXE_LOAD_LOW
, &hdr
[12]);
110 bfd_h_put_16(abfd
, 0x3e, &hdr
[24]);
111 bfd_h_put_16(abfd
, 0x0001, &hdr
[28]); /* XXX??? */
112 bfd_h_put_16(abfd
, 0x30fb, &hdr
[30]); /* XXX??? */
113 bfd_h_put_16(abfd
, 0x726a, &hdr
[32]); /* XXX??? */
115 /* bytes in last page (0 = full page) */
116 bfd_h_put_16(abfd
, outfile_size
& (EXE_PAGE_SIZE
- 1), &hdr
[2]);
118 /* number of pages */
119 bfd_h_put_16(abfd
, (outfile_size
+ EXE_PAGE_SIZE
- 1) / EXE_PAGE_SIZE
,
122 /* Set the initial stack pointer to the end of the bss.
123 The program's crt0 code must relocate it to a real stack. */
124 bfd_h_put_16(abfd
, high_vma
, &hdr
[16]);
126 if (bfd_seek (abfd
, (file_ptr
) 0, SEEK_SET
) != 0
127 || bfd_write (hdr
, 1, sizeof(hdr
), abfd
) != sizeof(hdr
))
134 msdos_set_section_contents (abfd
, section
, location
, offset
, count
)
145 section
->filepos
= EXE_PAGE_SIZE
+ bfd_get_section_vma (abfd
, section
);
147 if (bfd_get_section_flags (abfd
, section
) & SEC_LOAD
)
149 if (bfd_seek (abfd
, (file_ptr
) (section
->filepos
+ offset
), SEEK_SET
) != 0
150 || bfd_write (location
, 1, count
, abfd
) != count
)
159 #define msdos_mkobject aout_32_mkobject
160 #define msdos_make_empty_symbol aout_32_make_empty_symbol
161 #define msdos_bfd_reloc_type_lookup aout_32_reloc_type_lookup
163 #define msdos_close_and_cleanup _bfd_generic_close_and_cleanup
164 #define msdos_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
165 #define msdos_new_section_hook _bfd_generic_new_section_hook
166 #define msdos_get_section_contents _bfd_generic_get_section_contents
167 #define msdos_get_section_contents_in_window \
168 _bfd_generic_get_section_contents_in_window
169 #define msdos_bfd_get_relocated_section_contents \
170 bfd_generic_get_relocated_section_contents
171 #define msdos_bfd_relax_section bfd_generic_relax_section
172 #define msdos_bfd_gc_sections bfd_generic_gc_sections
173 #define msdos_bfd_merge_sections bfd_generic_merge_sections
174 #define msdos_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
175 #define msdos_bfd_link_add_symbols _bfd_generic_link_add_symbols
176 #define msdos_bfd_final_link _bfd_generic_final_link
177 #define msdos_bfd_link_split_section _bfd_generic_link_split_section
178 #define msdos_set_arch_mach _bfd_generic_set_arch_mach
180 #define msdos_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
181 #define msdos_get_symtab _bfd_nosymbols_get_symtab
182 #define msdos_print_symbol _bfd_nosymbols_print_symbol
183 #define msdos_get_symbol_info _bfd_nosymbols_get_symbol_info
184 #define msdos_find_nearest_line _bfd_nosymbols_find_nearest_line
185 #define msdos_get_lineno _bfd_nosymbols_get_lineno
186 #define msdos_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
187 #define msdos_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
188 #define msdos_read_minisymbols _bfd_nosymbols_read_minisymbols
189 #define msdos_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
191 #define msdos_canonicalize_reloc _bfd_norelocs_canonicalize_reloc
192 #define msdos_get_reloc_upper_bound _bfd_norelocs_get_reloc_upper_bound
193 #define msdos_32_bfd_link_split_section _bfd_generic_link_split_section
195 const bfd_target i386msdos_vec
=
198 bfd_target_msdos_flavour
,
199 BFD_ENDIAN_LITTLE
, /* target byte order */
200 BFD_ENDIAN_LITTLE
, /* target headers byte order */
201 (EXEC_P
), /* object flags */
202 (SEC_CODE
| SEC_DATA
| SEC_HAS_CONTENTS
203 | SEC_ALLOC
| SEC_LOAD
), /* section flags */
204 0, /* leading underscore */
205 ' ', /* ar_pad_char */
206 16, /* ar_max_namelen */
207 bfd_getl64
, bfd_getl_signed_64
, bfd_putl64
,
208 bfd_getl32
, bfd_getl_signed_32
, bfd_putl32
,
209 bfd_getl16
, bfd_getl_signed_16
, bfd_putl16
, /* data */
210 bfd_getl64
, bfd_getl_signed_64
, bfd_putl64
,
211 bfd_getl32
, bfd_getl_signed_32
, bfd_putl32
,
212 bfd_getl16
, bfd_getl_signed_16
, bfd_putl16
, /* hdrs */
216 _bfd_dummy_target
, /* bfd_check_format */
223 _bfd_generic_mkarchive
,
226 { /* bfd_write_contents */
228 msdos_write_object_contents
,
229 _bfd_write_archive_contents
,
233 BFD_JUMP_TABLE_GENERIC (msdos
),
234 BFD_JUMP_TABLE_COPY (_bfd_generic
),
235 BFD_JUMP_TABLE_CORE (_bfd_nocore
),
236 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive
),
237 BFD_JUMP_TABLE_SYMBOLS (msdos
),
238 BFD_JUMP_TABLE_RELOCS (msdos
),
239 BFD_JUMP_TABLE_WRITE (msdos
),
240 BFD_JUMP_TABLE_LINK (msdos
),
241 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic
),