1*3d8817e4Smiod /* BFD back-end for MS-DOS executables.
2*3d8817e4Smiod Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002,
3*3d8817e4Smiod 2003, 2004, 2005 Free Software Foundation, Inc.
4*3d8817e4Smiod Written by Bryan Ford of the University of Utah.
5*3d8817e4Smiod
6*3d8817e4Smiod Contributed by the Center for Software Science at the
7*3d8817e4Smiod University of Utah (pa-gdb-bugs@cs.utah.edu).
8*3d8817e4Smiod
9*3d8817e4Smiod This file is part of BFD, the Binary File Descriptor library.
10*3d8817e4Smiod
11*3d8817e4Smiod This program is free software; you can redistribute it and/or modify
12*3d8817e4Smiod it under the terms of the GNU General Public License as published by
13*3d8817e4Smiod the Free Software Foundation; either version 2 of the License, or
14*3d8817e4Smiod (at your option) any later version.
15*3d8817e4Smiod
16*3d8817e4Smiod This program is distributed in the hope that it will be useful,
17*3d8817e4Smiod but WITHOUT ANY WARRANTY; without even the implied warranty of
18*3d8817e4Smiod MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19*3d8817e4Smiod GNU General Public License for more details.
20*3d8817e4Smiod
21*3d8817e4Smiod You should have received a copy of the GNU General Public License
22*3d8817e4Smiod along with this program; if not, write to the Free Software
23*3d8817e4Smiod Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
24*3d8817e4Smiod
25*3d8817e4Smiod
26*3d8817e4Smiod #include "bfd.h"
27*3d8817e4Smiod #include "sysdep.h"
28*3d8817e4Smiod #include "libbfd.h"
29*3d8817e4Smiod #include "libaout.h"
30*3d8817e4Smiod
31*3d8817e4Smiod #define EXE_MAGIC 0x5a4d
32*3d8817e4Smiod #define EXE_LOAD_HIGH 0x0000
33*3d8817e4Smiod #define EXE_LOAD_LOW 0xffff
34*3d8817e4Smiod #define EXE_PAGE_SIZE 512
35*3d8817e4Smiod
36*3d8817e4Smiod static int msdos_sizeof_headers
37*3d8817e4Smiod PARAMS ((bfd *, bfd_boolean));
38*3d8817e4Smiod static bfd_boolean msdos_write_object_contents
39*3d8817e4Smiod PARAMS ((bfd *));
40*3d8817e4Smiod static bfd_boolean msdos_set_section_contents
41*3d8817e4Smiod PARAMS ((bfd *, sec_ptr, const PTR, file_ptr, bfd_size_type));
42*3d8817e4Smiod
43*3d8817e4Smiod static int
msdos_sizeof_headers(abfd,exec)44*3d8817e4Smiod msdos_sizeof_headers (abfd, exec)
45*3d8817e4Smiod bfd *abfd ATTRIBUTE_UNUSED;
46*3d8817e4Smiod bfd_boolean exec ATTRIBUTE_UNUSED;
47*3d8817e4Smiod {
48*3d8817e4Smiod return 0;
49*3d8817e4Smiod }
50*3d8817e4Smiod
51*3d8817e4Smiod static bfd_boolean
msdos_write_object_contents(abfd)52*3d8817e4Smiod msdos_write_object_contents (abfd)
53*3d8817e4Smiod bfd *abfd;
54*3d8817e4Smiod {
55*3d8817e4Smiod static char hdr[EXE_PAGE_SIZE];
56*3d8817e4Smiod file_ptr outfile_size = sizeof(hdr);
57*3d8817e4Smiod bfd_vma high_vma = 0;
58*3d8817e4Smiod asection *sec;
59*3d8817e4Smiod
60*3d8817e4Smiod /* Find the total size of the program on disk and in memory. */
61*3d8817e4Smiod for (sec = abfd->sections; sec != (asection *) NULL; sec = sec->next)
62*3d8817e4Smiod {
63*3d8817e4Smiod if (sec->size == 0)
64*3d8817e4Smiod continue;
65*3d8817e4Smiod if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
66*3d8817e4Smiod {
67*3d8817e4Smiod bfd_vma sec_vma = bfd_get_section_vma (abfd, sec) + sec->size;
68*3d8817e4Smiod if (sec_vma > high_vma)
69*3d8817e4Smiod high_vma = sec_vma;
70*3d8817e4Smiod }
71*3d8817e4Smiod if (bfd_get_section_flags (abfd, sec) & SEC_LOAD)
72*3d8817e4Smiod {
73*3d8817e4Smiod file_ptr sec_end = (sizeof (hdr)
74*3d8817e4Smiod + bfd_get_section_vma (abfd, sec)
75*3d8817e4Smiod + sec->size);
76*3d8817e4Smiod if (sec_end > outfile_size)
77*3d8817e4Smiod outfile_size = sec_end;
78*3d8817e4Smiod }
79*3d8817e4Smiod }
80*3d8817e4Smiod
81*3d8817e4Smiod /* Make sure the program isn't too big. */
82*3d8817e4Smiod if (high_vma > (bfd_vma)0xffff)
83*3d8817e4Smiod {
84*3d8817e4Smiod bfd_set_error(bfd_error_file_too_big);
85*3d8817e4Smiod return FALSE;
86*3d8817e4Smiod }
87*3d8817e4Smiod
88*3d8817e4Smiod /* Constants. */
89*3d8817e4Smiod H_PUT_16 (abfd, EXE_MAGIC, &hdr[0]);
90*3d8817e4Smiod H_PUT_16 (abfd, EXE_PAGE_SIZE / 16, &hdr[8]);
91*3d8817e4Smiod H_PUT_16 (abfd, EXE_LOAD_LOW, &hdr[12]);
92*3d8817e4Smiod H_PUT_16 (abfd, 0x3e, &hdr[24]);
93*3d8817e4Smiod H_PUT_16 (abfd, 0x0001, &hdr[28]); /* XXX??? */
94*3d8817e4Smiod H_PUT_16 (abfd, 0x30fb, &hdr[30]); /* XXX??? */
95*3d8817e4Smiod H_PUT_16 (abfd, 0x726a, &hdr[32]); /* XXX??? */
96*3d8817e4Smiod
97*3d8817e4Smiod /* Bytes in last page (0 = full page). */
98*3d8817e4Smiod H_PUT_16 (abfd, outfile_size & (EXE_PAGE_SIZE - 1), &hdr[2]);
99*3d8817e4Smiod
100*3d8817e4Smiod /* Number of pages. */
101*3d8817e4Smiod H_PUT_16 (abfd, (outfile_size + EXE_PAGE_SIZE - 1) / EXE_PAGE_SIZE, &hdr[4]);
102*3d8817e4Smiod
103*3d8817e4Smiod /* Set the initial stack pointer to the end of the bss.
104*3d8817e4Smiod The program's crt0 code must relocate it to a real stack. */
105*3d8817e4Smiod H_PUT_16 (abfd, high_vma, &hdr[16]);
106*3d8817e4Smiod
107*3d8817e4Smiod if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
108*3d8817e4Smiod || bfd_bwrite (hdr, (bfd_size_type) sizeof(hdr), abfd) != sizeof(hdr))
109*3d8817e4Smiod return FALSE;
110*3d8817e4Smiod
111*3d8817e4Smiod return TRUE;
112*3d8817e4Smiod }
113*3d8817e4Smiod
114*3d8817e4Smiod static bfd_boolean
msdos_set_section_contents(abfd,section,location,offset,count)115*3d8817e4Smiod msdos_set_section_contents (abfd, section, location, offset, count)
116*3d8817e4Smiod bfd *abfd;
117*3d8817e4Smiod sec_ptr section;
118*3d8817e4Smiod const PTR location;
119*3d8817e4Smiod file_ptr offset;
120*3d8817e4Smiod bfd_size_type count;
121*3d8817e4Smiod {
122*3d8817e4Smiod
123*3d8817e4Smiod if (count == 0)
124*3d8817e4Smiod return TRUE;
125*3d8817e4Smiod
126*3d8817e4Smiod section->filepos = EXE_PAGE_SIZE + bfd_get_section_vma (abfd, section);
127*3d8817e4Smiod
128*3d8817e4Smiod if (bfd_get_section_flags (abfd, section) & SEC_LOAD)
129*3d8817e4Smiod {
130*3d8817e4Smiod if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0
131*3d8817e4Smiod || bfd_bwrite (location, count, abfd) != count)
132*3d8817e4Smiod return FALSE;
133*3d8817e4Smiod }
134*3d8817e4Smiod
135*3d8817e4Smiod return TRUE;
136*3d8817e4Smiod }
137*3d8817e4Smiod
138*3d8817e4Smiod
139*3d8817e4Smiod
140*3d8817e4Smiod #define msdos_mkobject aout_32_mkobject
141*3d8817e4Smiod #define msdos_make_empty_symbol aout_32_make_empty_symbol
142*3d8817e4Smiod #define msdos_bfd_reloc_type_lookup aout_32_reloc_type_lookup
143*3d8817e4Smiod
144*3d8817e4Smiod #define msdos_close_and_cleanup _bfd_generic_close_and_cleanup
145*3d8817e4Smiod #define msdos_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
146*3d8817e4Smiod #define msdos_new_section_hook _bfd_generic_new_section_hook
147*3d8817e4Smiod #define msdos_get_section_contents _bfd_generic_get_section_contents
148*3d8817e4Smiod #define msdos_get_section_contents_in_window \
149*3d8817e4Smiod _bfd_generic_get_section_contents_in_window
150*3d8817e4Smiod #define msdos_bfd_get_relocated_section_contents \
151*3d8817e4Smiod bfd_generic_get_relocated_section_contents
152*3d8817e4Smiod #define msdos_bfd_relax_section bfd_generic_relax_section
153*3d8817e4Smiod #define msdos_bfd_gc_sections bfd_generic_gc_sections
154*3d8817e4Smiod #define msdos_bfd_merge_sections bfd_generic_merge_sections
155*3d8817e4Smiod #define msdos_bfd_is_group_section bfd_generic_is_group_section
156*3d8817e4Smiod #define msdos_bfd_discard_group bfd_generic_discard_group
157*3d8817e4Smiod #define msdos_section_already_linked \
158*3d8817e4Smiod _bfd_generic_section_already_linked
159*3d8817e4Smiod #define msdos_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
160*3d8817e4Smiod #define msdos_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
161*3d8817e4Smiod #define msdos_bfd_link_add_symbols _bfd_generic_link_add_symbols
162*3d8817e4Smiod #define msdos_bfd_link_just_syms _bfd_generic_link_just_syms
163*3d8817e4Smiod #define msdos_bfd_final_link _bfd_generic_final_link
164*3d8817e4Smiod #define msdos_bfd_link_split_section _bfd_generic_link_split_section
165*3d8817e4Smiod #define msdos_set_arch_mach _bfd_generic_set_arch_mach
166*3d8817e4Smiod
167*3d8817e4Smiod #define msdos_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
168*3d8817e4Smiod #define msdos_canonicalize_symtab _bfd_nosymbols_canonicalize_symtab
169*3d8817e4Smiod #define msdos_print_symbol _bfd_nosymbols_print_symbol
170*3d8817e4Smiod #define msdos_get_symbol_info _bfd_nosymbols_get_symbol_info
171*3d8817e4Smiod #define msdos_find_nearest_line _bfd_nosymbols_find_nearest_line
172*3d8817e4Smiod #define msdos_find_inliner_info _bfd_nosymbols_find_inliner_info
173*3d8817e4Smiod #define msdos_get_lineno _bfd_nosymbols_get_lineno
174*3d8817e4Smiod #define msdos_bfd_is_target_special_symbol ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
175*3d8817e4Smiod #define msdos_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
176*3d8817e4Smiod #define msdos_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
177*3d8817e4Smiod #define msdos_read_minisymbols _bfd_nosymbols_read_minisymbols
178*3d8817e4Smiod #define msdos_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
179*3d8817e4Smiod
180*3d8817e4Smiod #define msdos_canonicalize_reloc _bfd_norelocs_canonicalize_reloc
181*3d8817e4Smiod #define msdos_get_reloc_upper_bound _bfd_norelocs_get_reloc_upper_bound
182*3d8817e4Smiod #define msdos_32_bfd_link_split_section _bfd_generic_link_split_section
183*3d8817e4Smiod
184*3d8817e4Smiod const bfd_target i386msdos_vec =
185*3d8817e4Smiod {
186*3d8817e4Smiod "msdos", /* name */
187*3d8817e4Smiod bfd_target_msdos_flavour,
188*3d8817e4Smiod BFD_ENDIAN_LITTLE, /* target byte order */
189*3d8817e4Smiod BFD_ENDIAN_LITTLE, /* target headers byte order */
190*3d8817e4Smiod (EXEC_P), /* object flags */
191*3d8817e4Smiod (SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS
192*3d8817e4Smiod | SEC_ALLOC | SEC_LOAD), /* section flags */
193*3d8817e4Smiod 0, /* leading underscore */
194*3d8817e4Smiod ' ', /* ar_pad_char */
195*3d8817e4Smiod 16, /* ar_max_namelen */
196*3d8817e4Smiod bfd_getl64, bfd_getl_signed_64, bfd_putl64,
197*3d8817e4Smiod bfd_getl32, bfd_getl_signed_32, bfd_putl32,
198*3d8817e4Smiod bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
199*3d8817e4Smiod bfd_getl64, bfd_getl_signed_64, bfd_putl64,
200*3d8817e4Smiod bfd_getl32, bfd_getl_signed_32, bfd_putl32,
201*3d8817e4Smiod bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
202*3d8817e4Smiod
203*3d8817e4Smiod {
204*3d8817e4Smiod _bfd_dummy_target,
205*3d8817e4Smiod _bfd_dummy_target, /* bfd_check_format */
206*3d8817e4Smiod _bfd_dummy_target,
207*3d8817e4Smiod _bfd_dummy_target,
208*3d8817e4Smiod },
209*3d8817e4Smiod {
210*3d8817e4Smiod bfd_false,
211*3d8817e4Smiod msdos_mkobject,
212*3d8817e4Smiod _bfd_generic_mkarchive,
213*3d8817e4Smiod bfd_false,
214*3d8817e4Smiod },
215*3d8817e4Smiod { /* bfd_write_contents */
216*3d8817e4Smiod bfd_false,
217*3d8817e4Smiod msdos_write_object_contents,
218*3d8817e4Smiod _bfd_write_archive_contents,
219*3d8817e4Smiod bfd_false,
220*3d8817e4Smiod },
221*3d8817e4Smiod
222*3d8817e4Smiod BFD_JUMP_TABLE_GENERIC (msdos),
223*3d8817e4Smiod BFD_JUMP_TABLE_COPY (_bfd_generic),
224*3d8817e4Smiod BFD_JUMP_TABLE_CORE (_bfd_nocore),
225*3d8817e4Smiod BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
226*3d8817e4Smiod BFD_JUMP_TABLE_SYMBOLS (msdos),
227*3d8817e4Smiod BFD_JUMP_TABLE_RELOCS (msdos),
228*3d8817e4Smiod BFD_JUMP_TABLE_WRITE (msdos),
229*3d8817e4Smiod BFD_JUMP_TABLE_LINK (msdos),
230*3d8817e4Smiod BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
231*3d8817e4Smiod
232*3d8817e4Smiod NULL,
233*3d8817e4Smiod
234*3d8817e4Smiod (PTR) 0
235*3d8817e4Smiod };
236*3d8817e4Smiod
237*3d8817e4Smiod
238