* cgen-ibld.in (extract_normal): Match type of VALUE and MASK
[binutils.git] / bfd / i386msdos.c
blob91e4d9d8e6bd821a20a43215301e20af42315dd0
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. */
26 #include "bfd.h"
27 #include "sysdep.h"
28 #include "libbfd.h"
29 #include "libaout.h"
31 #if 0
32 struct exe_header
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;
52 #endif
54 #define EXE_MAGIC 0x5a4d
55 #define EXE_LOAD_HIGH 0x0000
56 #define EXE_LOAD_LOW 0xffff
57 #define EXE_PAGE_SIZE 512
60 static int
61 msdos_sizeof_headers (abfd, exec)
62 bfd *abfd ATTRIBUTE_UNUSED;
63 boolean exec ATTRIBUTE_UNUSED;
65 return 0;
68 static boolean
69 msdos_write_object_contents (abfd)
70 bfd *abfd;
72 static char hdr[EXE_PAGE_SIZE];
73 file_ptr outfile_size = sizeof(hdr);
74 bfd_vma high_vma = 0;
75 asection *sec;
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)
81 continue;
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)
87 high_vma = sec_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);
103 return false;
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??? */
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,
120 &hdr[4]);
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))
128 return false;
130 return true;
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;
142 if (count == 0)
143 return true;
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)
151 return false;
154 return true;
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 =
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 */
215 _bfd_dummy_target,
216 _bfd_dummy_target, /* bfd_check_format */
217 _bfd_dummy_target,
218 _bfd_dummy_target,
221 bfd_false,
222 msdos_mkobject,
223 _bfd_generic_mkarchive,
224 bfd_false,
226 { /* bfd_write_contents */
227 bfd_false,
228 msdos_write_object_contents,
229 _bfd_write_archive_contents,
230 bfd_false,
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),
243 NULL,
245 (PTR) 0