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252b5132 | 1 | /* BFD back-end for MS-DOS executables. |
7898deda | 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999 |
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 | { | |
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; | |
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 | ||
59 | ||
60 | static int | |
61 | msdos_sizeof_headers (abfd, exec) | |
5f771d47 ILT |
62 | bfd *abfd ATTRIBUTE_UNUSED; |
63 | boolean exec ATTRIBUTE_UNUSED; | |
252b5132 RH |
64 | { |
65 | return 0; | |
66 | } | |
67 | ||
68 | static boolean | |
69 | msdos_write_object_contents (abfd) | |
70 | bfd *abfd; | |
71 | { | |
72 | static char hdr[EXE_PAGE_SIZE]; | |
73 | file_ptr outfile_size = sizeof(hdr); | |
74 | bfd_vma high_vma = 0; | |
75 | asection *sec; | |
76 | ||
77 | /* Find the total size of the program on disk and in memory. */ | |
78 | for (sec = abfd->sections; sec != (asection *) NULL; sec = sec->next) | |
79 | { | |
80 | if (bfd_get_section_size_before_reloc (sec) == 0) | |
81 | continue; | |
82 | if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC) | |
83 | { | |
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) | |
87 | high_vma = sec_vma; | |
88 | } | |
89 | if (bfd_get_section_flags (abfd, sec) & SEC_LOAD) | |
90 | { | |
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; | |
96 | } | |
97 | } | |
98 | ||
99 | /* Make sure the program isn't too big. */ | |
100 | if (high_vma > (bfd_vma)0xffff) | |
101 | { | |
102 | bfd_set_error(bfd_error_file_too_big); | |
103 | return false; | |
104 | } | |
105 | ||
106 | /* constants */ | |
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??? */ | |
114 | ||
115 | /* bytes in last page (0 = full page) */ | |
116 | bfd_h_put_16(abfd, outfile_size & (EXE_PAGE_SIZE - 1), &hdr[2]); | |
117 | ||
118 | /* number of pages */ | |
119 | bfd_h_put_16(abfd, (outfile_size + EXE_PAGE_SIZE - 1) / EXE_PAGE_SIZE, | |
120 | &hdr[4]); | |
121 | ||
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]); | |
125 | ||
126 | if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 | |
127 | || bfd_write (hdr, 1, sizeof(hdr), abfd) != sizeof(hdr)) | |
128 | return false; | |
129 | ||
130 | return true; | |
131 | } | |
132 | ||
133 | static boolean | |
134 | msdos_set_section_contents (abfd, section, location, offset, count) | |
135 | bfd *abfd; | |
136 | sec_ptr section; | |
137 | PTR location; | |
138 | file_ptr offset; | |
139 | bfd_size_type count; | |
140 | { | |
141 | ||
142 | if (count == 0) | |
143 | return true; | |
144 | ||
145 | section->filepos = EXE_PAGE_SIZE + bfd_get_section_vma (abfd, section); | |
146 | ||
147 | if (bfd_get_section_flags (abfd, section) & SEC_LOAD) | |
148 | { | |
149 | if (bfd_seek (abfd, (file_ptr) (section->filepos + offset), SEEK_SET) != 0 | |
150 | || bfd_write (location, 1, count, abfd) != count) | |
151 | return false; | |
152 | } | |
153 | ||
154 | return true; | |
155 | } | |
156 | ||
157 | ||
158 | ||
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 | |
162 | ||
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 | |
8550eb6e | 173 | #define msdos_bfd_merge_sections bfd_generic_merge_sections |
252b5132 RH |
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 | |
179 | ||
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 | |
190 | ||
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 | |
194 | ||
195 | const bfd_target i386msdos_vec = | |
196 | { | |
197 | "msdos", /* name */ | |
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 */ | |
213 | ||
214 | { | |
215 | _bfd_dummy_target, | |
216 | _bfd_dummy_target, /* bfd_check_format */ | |
217 | _bfd_dummy_target, | |
218 | _bfd_dummy_target, | |
219 | }, | |
220 | { | |
221 | bfd_false, | |
222 | msdos_mkobject, | |
223 | _bfd_generic_mkarchive, | |
224 | bfd_false, | |
225 | }, | |
226 | { /* bfd_write_contents */ | |
227 | bfd_false, | |
228 | msdos_write_object_contents, | |
229 | _bfd_write_archive_contents, | |
230 | bfd_false, | |
231 | }, | |
232 | ||
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), | |
242 | ||
c3c89269 NC |
243 | NULL, |
244 | ||
252b5132 RH |
245 | (PTR) 0 |
246 | }; | |
247 | ||
248 |