1 |
104 |
markom |
/* BFD back-end for binary objects.
|
2 |
|
|
Copyright 1994, 95, 96, 97, 98, 1999 Free Software Foundation, Inc.
|
3 |
|
|
Written by Ian Lance Taylor, Cygnus Support, <ian@cygnus.com>
|
4 |
|
|
|
5 |
|
|
This file is part of BFD, the Binary File Descriptor library.
|
6 |
|
|
|
7 |
|
|
This program is free software; you can redistribute it and/or modify
|
8 |
|
|
it under the terms of the GNU General Public License as published by
|
9 |
|
|
the Free Software Foundation; either version 2 of the License, or
|
10 |
|
|
(at your option) any later version.
|
11 |
|
|
|
12 |
|
|
This program is distributed in the hope that it will be useful,
|
13 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
14 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
15 |
|
|
GNU General Public License for more details.
|
16 |
|
|
|
17 |
|
|
You should have received a copy of the GNU General Public License
|
18 |
|
|
along with this program; if not, write to the Free Software
|
19 |
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
20 |
|
|
|
21 |
|
|
/* This is a BFD backend which may be used to write binary objects.
|
22 |
|
|
It may only be used for output, not input. The intention is that
|
23 |
|
|
this may be used as an output format for objcopy in order to
|
24 |
|
|
generate raw binary data.
|
25 |
|
|
|
26 |
|
|
This is very simple. The only complication is that the real data
|
27 |
|
|
will start at some address X, and in some cases we will not want to
|
28 |
|
|
include X zeroes just to get to that point. Since the start
|
29 |
|
|
address is not meaningful for this object file format, we use it
|
30 |
|
|
instead to indicate the number of zeroes to skip at the start of
|
31 |
|
|
the file. objcopy cooperates by specially setting the start
|
32 |
|
|
address to zero by default. */
|
33 |
|
|
|
34 |
|
|
#include <ctype.h>
|
35 |
|
|
|
36 |
|
|
#include "bfd.h"
|
37 |
|
|
#include "sysdep.h"
|
38 |
|
|
#include "libbfd.h"
|
39 |
|
|
|
40 |
|
|
/* Any bfd we create by reading a binary file has three symbols:
|
41 |
|
|
a start symbol, an end symbol, and an absolute length symbol. */
|
42 |
|
|
#define BIN_SYMS 3
|
43 |
|
|
|
44 |
|
|
static boolean binary_mkobject PARAMS ((bfd *));
|
45 |
|
|
static const bfd_target *binary_object_p PARAMS ((bfd *));
|
46 |
|
|
static boolean binary_get_section_contents
|
47 |
|
|
PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
|
48 |
|
|
static long binary_get_symtab_upper_bound PARAMS ((bfd *));
|
49 |
|
|
static char *mangle_name PARAMS ((bfd *, char *));
|
50 |
|
|
static long binary_get_symtab PARAMS ((bfd *, asymbol **));
|
51 |
|
|
static asymbol *binary_make_empty_symbol PARAMS ((bfd *));
|
52 |
|
|
static void binary_get_symbol_info PARAMS ((bfd *, asymbol *, symbol_info *));
|
53 |
|
|
static boolean binary_set_section_contents
|
54 |
|
|
PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
|
55 |
|
|
static int binary_sizeof_headers PARAMS ((bfd *, boolean));
|
56 |
|
|
|
57 |
|
|
/* Create a binary object. Invoked via bfd_set_format. */
|
58 |
|
|
|
59 |
|
|
static boolean
|
60 |
|
|
binary_mkobject (abfd)
|
61 |
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
62 |
|
|
{
|
63 |
|
|
return true;
|
64 |
|
|
}
|
65 |
|
|
|
66 |
|
|
/* Any file may be considered to be a binary file, provided the target
|
67 |
|
|
was not defaulted. That is, it must be explicitly specified as
|
68 |
|
|
being binary. */
|
69 |
|
|
|
70 |
|
|
static const bfd_target *
|
71 |
|
|
binary_object_p (abfd)
|
72 |
|
|
bfd *abfd;
|
73 |
|
|
{
|
74 |
|
|
struct stat statbuf;
|
75 |
|
|
asection *sec;
|
76 |
|
|
|
77 |
|
|
if (abfd->target_defaulted)
|
78 |
|
|
{
|
79 |
|
|
bfd_set_error (bfd_error_wrong_format);
|
80 |
|
|
return NULL;
|
81 |
|
|
}
|
82 |
|
|
|
83 |
|
|
abfd->symcount = BIN_SYMS;
|
84 |
|
|
|
85 |
|
|
/* Find the file size. */
|
86 |
|
|
if (bfd_stat (abfd, &statbuf) < 0)
|
87 |
|
|
{
|
88 |
|
|
bfd_set_error (bfd_error_system_call);
|
89 |
|
|
return NULL;
|
90 |
|
|
}
|
91 |
|
|
|
92 |
|
|
/* One data section. */
|
93 |
|
|
sec = bfd_make_section (abfd, ".data");
|
94 |
|
|
if (sec == NULL)
|
95 |
|
|
return NULL;
|
96 |
|
|
sec->flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS;
|
97 |
|
|
sec->vma = 0;
|
98 |
|
|
sec->_raw_size = statbuf.st_size;
|
99 |
|
|
sec->filepos = 0;
|
100 |
|
|
|
101 |
|
|
abfd->tdata.any = (PTR) sec;
|
102 |
|
|
|
103 |
|
|
return abfd->xvec;
|
104 |
|
|
}
|
105 |
|
|
|
106 |
|
|
#define binary_close_and_cleanup _bfd_generic_close_and_cleanup
|
107 |
|
|
#define binary_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
|
108 |
|
|
#define binary_new_section_hook _bfd_generic_new_section_hook
|
109 |
|
|
|
110 |
|
|
/* Get contents of the only section. */
|
111 |
|
|
|
112 |
|
|
static boolean
|
113 |
|
|
binary_get_section_contents (abfd, section, location, offset, count)
|
114 |
|
|
bfd *abfd;
|
115 |
|
|
asection *section ATTRIBUTE_UNUSED;
|
116 |
|
|
PTR location;
|
117 |
|
|
file_ptr offset;
|
118 |
|
|
bfd_size_type count;
|
119 |
|
|
{
|
120 |
|
|
if (bfd_seek (abfd, offset, SEEK_SET) != 0
|
121 |
|
|
|| bfd_read (location, 1, count, abfd) != count)
|
122 |
|
|
return false;
|
123 |
|
|
return true;
|
124 |
|
|
}
|
125 |
|
|
|
126 |
|
|
/* Return the amount of memory needed to read the symbol table. */
|
127 |
|
|
|
128 |
|
|
static long
|
129 |
|
|
binary_get_symtab_upper_bound (abfd)
|
130 |
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
131 |
|
|
{
|
132 |
|
|
return (BIN_SYMS + 1) * sizeof (asymbol *);
|
133 |
|
|
}
|
134 |
|
|
|
135 |
|
|
/* Create a symbol name based on the bfd's filename. */
|
136 |
|
|
|
137 |
|
|
static char *
|
138 |
|
|
mangle_name (abfd, suffix)
|
139 |
|
|
bfd *abfd;
|
140 |
|
|
char *suffix;
|
141 |
|
|
{
|
142 |
|
|
int size;
|
143 |
|
|
char *buf;
|
144 |
|
|
char *p;
|
145 |
|
|
|
146 |
|
|
size = (strlen (bfd_get_filename (abfd))
|
147 |
|
|
+ strlen (suffix)
|
148 |
|
|
+ sizeof "_binary__");
|
149 |
|
|
|
150 |
|
|
buf = (char *) bfd_alloc (abfd, size);
|
151 |
|
|
if (buf == NULL)
|
152 |
|
|
return "";
|
153 |
|
|
|
154 |
|
|
sprintf (buf, "_binary_%s_%s", bfd_get_filename (abfd), suffix);
|
155 |
|
|
|
156 |
|
|
/* Change any non-alphanumeric characters to underscores. */
|
157 |
|
|
for (p = buf; *p; p++)
|
158 |
|
|
if (! isalnum ((unsigned char) *p))
|
159 |
|
|
*p = '_';
|
160 |
|
|
|
161 |
|
|
return buf;
|
162 |
|
|
}
|
163 |
|
|
|
164 |
|
|
/* Return the symbol table. */
|
165 |
|
|
|
166 |
|
|
static long
|
167 |
|
|
binary_get_symtab (abfd, alocation)
|
168 |
|
|
bfd *abfd;
|
169 |
|
|
asymbol **alocation;
|
170 |
|
|
{
|
171 |
|
|
asection *sec = (asection *) abfd->tdata.any;
|
172 |
|
|
asymbol *syms;
|
173 |
|
|
unsigned int i;
|
174 |
|
|
|
175 |
|
|
syms = (asymbol *) bfd_alloc (abfd, BIN_SYMS * sizeof (asymbol));
|
176 |
|
|
if (syms == NULL)
|
177 |
|
|
return false;
|
178 |
|
|
|
179 |
|
|
/* Start symbol. */
|
180 |
|
|
syms[0].the_bfd = abfd;
|
181 |
|
|
syms[0].name = mangle_name (abfd, "start");
|
182 |
|
|
syms[0].value = 0;
|
183 |
|
|
syms[0].flags = BSF_GLOBAL;
|
184 |
|
|
syms[0].section = sec;
|
185 |
|
|
syms[0].udata.p = NULL;
|
186 |
|
|
|
187 |
|
|
/* End symbol. */
|
188 |
|
|
syms[1].the_bfd = abfd;
|
189 |
|
|
syms[1].name = mangle_name (abfd, "end");
|
190 |
|
|
syms[1].value = sec->_raw_size;
|
191 |
|
|
syms[1].flags = BSF_GLOBAL;
|
192 |
|
|
syms[1].section = sec;
|
193 |
|
|
syms[1].udata.p = NULL;
|
194 |
|
|
|
195 |
|
|
/* Size symbol. */
|
196 |
|
|
syms[2].the_bfd = abfd;
|
197 |
|
|
syms[2].name = mangle_name (abfd, "size");
|
198 |
|
|
syms[2].value = sec->_raw_size;
|
199 |
|
|
syms[2].flags = BSF_GLOBAL;
|
200 |
|
|
syms[2].section = bfd_abs_section_ptr;
|
201 |
|
|
syms[2].udata.p = NULL;
|
202 |
|
|
|
203 |
|
|
for (i = 0; i < BIN_SYMS; i++)
|
204 |
|
|
*alocation++ = syms++;
|
205 |
|
|
*alocation = NULL;
|
206 |
|
|
|
207 |
|
|
return BIN_SYMS;
|
208 |
|
|
}
|
209 |
|
|
|
210 |
|
|
/* Make an empty symbol. */
|
211 |
|
|
|
212 |
|
|
static asymbol *
|
213 |
|
|
binary_make_empty_symbol (abfd)
|
214 |
|
|
bfd *abfd;
|
215 |
|
|
{
|
216 |
|
|
return (asymbol *) bfd_alloc (abfd, sizeof (asymbol));
|
217 |
|
|
}
|
218 |
|
|
|
219 |
|
|
#define binary_print_symbol _bfd_nosymbols_print_symbol
|
220 |
|
|
|
221 |
|
|
/* Get information about a symbol. */
|
222 |
|
|
|
223 |
|
|
static void
|
224 |
|
|
binary_get_symbol_info (ignore_abfd, symbol, ret)
|
225 |
|
|
bfd *ignore_abfd ATTRIBUTE_UNUSED;
|
226 |
|
|
asymbol *symbol;
|
227 |
|
|
symbol_info *ret;
|
228 |
|
|
{
|
229 |
|
|
bfd_symbol_info (symbol, ret);
|
230 |
|
|
}
|
231 |
|
|
|
232 |
|
|
#define binary_bfd_is_local_label_name bfd_generic_is_local_label_name
|
233 |
|
|
#define binary_get_lineno _bfd_nosymbols_get_lineno
|
234 |
|
|
#define binary_find_nearest_line _bfd_nosymbols_find_nearest_line
|
235 |
|
|
#define binary_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
|
236 |
|
|
#define binary_read_minisymbols _bfd_generic_read_minisymbols
|
237 |
|
|
#define binary_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
|
238 |
|
|
|
239 |
|
|
#define binary_get_reloc_upper_bound \
|
240 |
|
|
((long (*) PARAMS ((bfd *, asection *))) bfd_0l)
|
241 |
|
|
#define binary_canonicalize_reloc \
|
242 |
|
|
((long (*) PARAMS ((bfd *, asection *, arelent **, asymbol **))) bfd_0l)
|
243 |
|
|
#define binary_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
|
244 |
|
|
|
245 |
|
|
/* Set the architecture of a binary file. */
|
246 |
|
|
#define binary_set_arch_mach _bfd_generic_set_arch_mach
|
247 |
|
|
|
248 |
|
|
/* Write section contents of a binary file. */
|
249 |
|
|
|
250 |
|
|
static boolean
|
251 |
|
|
binary_set_section_contents (abfd, sec, data, offset, size)
|
252 |
|
|
bfd *abfd;
|
253 |
|
|
asection *sec;
|
254 |
|
|
PTR data;
|
255 |
|
|
file_ptr offset;
|
256 |
|
|
bfd_size_type size;
|
257 |
|
|
{
|
258 |
|
|
if (! abfd->output_has_begun)
|
259 |
|
|
{
|
260 |
|
|
boolean found_low;
|
261 |
|
|
bfd_vma low;
|
262 |
|
|
asection *s;
|
263 |
|
|
|
264 |
|
|
/* The lowest section LMA sets the virtual address of the start
|
265 |
|
|
of the file. We use this to set the file position of all the
|
266 |
|
|
sections. */
|
267 |
|
|
found_low = false;
|
268 |
|
|
low = 0;
|
269 |
|
|
for (s = abfd->sections; s != NULL; s = s->next)
|
270 |
|
|
if (((s->flags
|
271 |
|
|
& (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC | SEC_NEVER_LOAD))
|
272 |
|
|
== (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC))
|
273 |
|
|
&& (! found_low || s->lma < low))
|
274 |
|
|
{
|
275 |
|
|
low = s->lma;
|
276 |
|
|
found_low = true;
|
277 |
|
|
}
|
278 |
|
|
|
279 |
|
|
for (s = abfd->sections; s != NULL; s = s->next)
|
280 |
|
|
{
|
281 |
|
|
s->filepos = s->lma - low;
|
282 |
|
|
|
283 |
|
|
/* Skip following warning check for sections that will not
|
284 |
|
|
occupy file space. */
|
285 |
|
|
if ((s->flags
|
286 |
|
|
& (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_NEVER_LOAD))
|
287 |
|
|
!= (SEC_HAS_CONTENTS | SEC_ALLOC))
|
288 |
|
|
continue;
|
289 |
|
|
|
290 |
|
|
/* If attempting to generate a binary file from a bfd with
|
291 |
|
|
LMA's all over the place, huge (sparse?) binary files may
|
292 |
|
|
result. This condition attempts to detect this situation
|
293 |
|
|
and print a warning. Better heuristics would be nice to
|
294 |
|
|
have. */
|
295 |
|
|
|
296 |
|
|
if (s->filepos < 0)
|
297 |
|
|
(*_bfd_error_handler)
|
298 |
|
|
(_("Warning: Writing section `%s' to huge (ie negative) file offset 0x%lx."),
|
299 |
|
|
bfd_get_section_name (abfd, s),
|
300 |
|
|
(unsigned long) s->filepos);
|
301 |
|
|
}
|
302 |
|
|
|
303 |
|
|
abfd->output_has_begun = true;
|
304 |
|
|
}
|
305 |
|
|
|
306 |
|
|
/* We don't want to output anything for a section that is neither
|
307 |
|
|
loaded nor allocated. The contents of such a section are not
|
308 |
|
|
meaningful in the binary format. */
|
309 |
|
|
if ((sec->flags & (SEC_LOAD | SEC_ALLOC)) == 0)
|
310 |
|
|
return true;
|
311 |
|
|
if ((sec->flags & SEC_NEVER_LOAD) != 0)
|
312 |
|
|
return true;
|
313 |
|
|
|
314 |
|
|
return _bfd_generic_set_section_contents (abfd, sec, data, offset, size);
|
315 |
|
|
}
|
316 |
|
|
|
317 |
|
|
/* No space is required for header information. */
|
318 |
|
|
|
319 |
|
|
static int
|
320 |
|
|
binary_sizeof_headers (abfd, exec)
|
321 |
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
322 |
|
|
boolean exec ATTRIBUTE_UNUSED;
|
323 |
|
|
{
|
324 |
|
|
return 0;
|
325 |
|
|
}
|
326 |
|
|
|
327 |
|
|
#define binary_bfd_get_relocated_section_contents \
|
328 |
|
|
bfd_generic_get_relocated_section_contents
|
329 |
|
|
#define binary_bfd_relax_section bfd_generic_relax_section
|
330 |
|
|
#define binary_bfd_gc_sections bfd_generic_gc_sections
|
331 |
|
|
#define binary_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
|
332 |
|
|
#define binary_bfd_link_add_symbols _bfd_generic_link_add_symbols
|
333 |
|
|
#define binary_bfd_final_link _bfd_generic_final_link
|
334 |
|
|
#define binary_bfd_link_split_section _bfd_generic_link_split_section
|
335 |
|
|
#define binary_get_section_contents_in_window \
|
336 |
|
|
_bfd_generic_get_section_contents_in_window
|
337 |
|
|
|
338 |
|
|
const bfd_target binary_vec =
|
339 |
|
|
{
|
340 |
|
|
"binary", /* name */
|
341 |
|
|
bfd_target_unknown_flavour, /* flavour */
|
342 |
|
|
BFD_ENDIAN_UNKNOWN, /* byteorder */
|
343 |
|
|
BFD_ENDIAN_UNKNOWN, /* header_byteorder */
|
344 |
|
|
EXEC_P, /* object_flags */
|
345 |
|
|
(SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA
|
346 |
|
|
| SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */
|
347 |
|
|
0, /* symbol_leading_char */
|
348 |
|
|
' ', /* ar_pad_char */
|
349 |
|
|
16, /* ar_max_namelen */
|
350 |
|
|
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
351 |
|
|
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
352 |
|
|
bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
|
353 |
|
|
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
354 |
|
|
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
355 |
|
|
bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
|
356 |
|
|
{ /* bfd_check_format */
|
357 |
|
|
_bfd_dummy_target,
|
358 |
|
|
binary_object_p, /* bfd_check_format */
|
359 |
|
|
_bfd_dummy_target,
|
360 |
|
|
_bfd_dummy_target,
|
361 |
|
|
},
|
362 |
|
|
{ /* bfd_set_format */
|
363 |
|
|
bfd_false,
|
364 |
|
|
binary_mkobject,
|
365 |
|
|
bfd_false,
|
366 |
|
|
bfd_false,
|
367 |
|
|
},
|
368 |
|
|
{ /* bfd_write_contents */
|
369 |
|
|
bfd_false,
|
370 |
|
|
bfd_true,
|
371 |
|
|
bfd_false,
|
372 |
|
|
bfd_false,
|
373 |
|
|
},
|
374 |
|
|
|
375 |
|
|
BFD_JUMP_TABLE_GENERIC (binary),
|
376 |
|
|
BFD_JUMP_TABLE_COPY (_bfd_generic),
|
377 |
|
|
BFD_JUMP_TABLE_CORE (_bfd_nocore),
|
378 |
|
|
BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
|
379 |
|
|
BFD_JUMP_TABLE_SYMBOLS (binary),
|
380 |
|
|
BFD_JUMP_TABLE_RELOCS (binary),
|
381 |
|
|
BFD_JUMP_TABLE_WRITE (binary),
|
382 |
|
|
BFD_JUMP_TABLE_LINK (binary),
|
383 |
|
|
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
|
384 |
|
|
|
385 |
|
|
NULL,
|
386 |
|
|
|
387 |
|
|
NULL
|
388 |
|
|
};
|