Commit | Line | Data |
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252b5132 | 1 | /* BFD back-end for binary objects. |
b749473b NC |
2 | Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, |
3 | 2003 | |
7898deda | 4 | Free Software Foundation, Inc. |
252b5132 RH |
5 | Written by Ian Lance Taylor, Cygnus Support, <ian@cygnus.com> |
6 | ||
b749473b | 7 | This file is part of BFD, the Binary File Descriptor library. |
252b5132 | 8 | |
b749473b NC |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
252b5132 | 13 | |
b749473b NC |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
252b5132 | 18 | |
b749473b NC |
19 | You should have received a copy of the GNU General Public License |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
252b5132 RH |
22 | |
23 | /* This is a BFD backend which may be used to write binary objects. | |
24 | It may only be used for output, not input. The intention is that | |
25 | this may be used as an output format for objcopy in order to | |
26 | generate raw binary data. | |
27 | ||
28 | This is very simple. The only complication is that the real data | |
29 | will start at some address X, and in some cases we will not want to | |
30 | include X zeroes just to get to that point. Since the start | |
31 | address is not meaningful for this object file format, we use it | |
32 | instead to indicate the number of zeroes to skip at the start of | |
33 | the file. objcopy cooperates by specially setting the start | |
34 | address to zero by default. */ | |
35 | ||
252b5132 RH |
36 | #include "bfd.h" |
37 | #include "sysdep.h" | |
7e250b6c | 38 | #include "safe-ctype.h" |
252b5132 RH |
39 | #include "libbfd.h" |
40 | ||
41 | /* Any bfd we create by reading a binary file has three symbols: | |
42 | a start symbol, an end symbol, and an absolute length symbol. */ | |
43 | #define BIN_SYMS 3 | |
44 | ||
b34976b6 | 45 | static bfd_boolean binary_mkobject PARAMS ((bfd *)); |
252b5132 | 46 | static const bfd_target *binary_object_p PARAMS ((bfd *)); |
b34976b6 | 47 | static bfd_boolean binary_get_section_contents |
252b5132 RH |
48 | PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type)); |
49 | static long binary_get_symtab_upper_bound PARAMS ((bfd *)); | |
50 | static char *mangle_name PARAMS ((bfd *, char *)); | |
6cee3f79 | 51 | static long binary_canonicalize_symtab PARAMS ((bfd *, asymbol **)); |
252b5132 | 52 | static void binary_get_symbol_info PARAMS ((bfd *, asymbol *, symbol_info *)); |
b34976b6 | 53 | static bfd_boolean binary_set_section_contents |
252b5132 | 54 | PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type)); |
b34976b6 | 55 | static int binary_sizeof_headers PARAMS ((bfd *, bfd_boolean)); |
252b5132 | 56 | |
b749473b NC |
57 | /* Set by external programs - specifies the BFD architecture and |
58 | machine number to be uses when creating binary BFDs. */ | |
59 | enum bfd_architecture bfd_external_binary_architecture = bfd_arch_unknown; | |
60 | unsigned long bfd_external_machine = 0; | |
43a0748c | 61 | |
252b5132 RH |
62 | /* Create a binary object. Invoked via bfd_set_format. */ |
63 | ||
b34976b6 | 64 | static bfd_boolean |
252b5132 | 65 | binary_mkobject (abfd) |
7442e600 | 66 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 | 67 | { |
b34976b6 | 68 | return TRUE; |
252b5132 RH |
69 | } |
70 | ||
71 | /* Any file may be considered to be a binary file, provided the target | |
72 | was not defaulted. That is, it must be explicitly specified as | |
73 | being binary. */ | |
74 | ||
75 | static const bfd_target * | |
76 | binary_object_p (abfd) | |
77 | bfd *abfd; | |
78 | { | |
79 | struct stat statbuf; | |
80 | asection *sec; | |
81 | ||
82 | if (abfd->target_defaulted) | |
83 | { | |
84 | bfd_set_error (bfd_error_wrong_format); | |
85 | return NULL; | |
86 | } | |
87 | ||
88 | abfd->symcount = BIN_SYMS; | |
89 | ||
90 | /* Find the file size. */ | |
91 | if (bfd_stat (abfd, &statbuf) < 0) | |
92 | { | |
93 | bfd_set_error (bfd_error_system_call); | |
94 | return NULL; | |
95 | } | |
96 | ||
97 | /* One data section. */ | |
98 | sec = bfd_make_section (abfd, ".data"); | |
99 | if (sec == NULL) | |
100 | return NULL; | |
101 | sec->flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS; | |
102 | sec->vma = 0; | |
103 | sec->_raw_size = statbuf.st_size; | |
104 | sec->filepos = 0; | |
105 | ||
106 | abfd->tdata.any = (PTR) sec; | |
107 | ||
43a0748c NC |
108 | if (bfd_get_arch_info (abfd) != NULL) |
109 | { | |
110 | if ((bfd_get_arch_info (abfd)->arch == bfd_arch_unknown) | |
111 | && (bfd_external_binary_architecture != bfd_arch_unknown)) | |
b749473b NC |
112 | bfd_set_arch_info (abfd, bfd_lookup_arch |
113 | (bfd_external_binary_architecture, bfd_external_machine)); | |
43a0748c | 114 | } |
dc810e39 | 115 | |
252b5132 RH |
116 | return abfd->xvec; |
117 | } | |
118 | ||
119 | #define binary_close_and_cleanup _bfd_generic_close_and_cleanup | |
120 | #define binary_bfd_free_cached_info _bfd_generic_bfd_free_cached_info | |
121 | #define binary_new_section_hook _bfd_generic_new_section_hook | |
122 | ||
123 | /* Get contents of the only section. */ | |
124 | ||
b34976b6 | 125 | static bfd_boolean |
252b5132 RH |
126 | binary_get_section_contents (abfd, section, location, offset, count) |
127 | bfd *abfd; | |
7442e600 | 128 | asection *section ATTRIBUTE_UNUSED; |
252b5132 RH |
129 | PTR location; |
130 | file_ptr offset; | |
131 | bfd_size_type count; | |
132 | { | |
133 | if (bfd_seek (abfd, offset, SEEK_SET) != 0 | |
dc810e39 | 134 | || bfd_bread (location, count, abfd) != count) |
b34976b6 AM |
135 | return FALSE; |
136 | return TRUE; | |
252b5132 RH |
137 | } |
138 | ||
139 | /* Return the amount of memory needed to read the symbol table. */ | |
140 | ||
141 | static long | |
142 | binary_get_symtab_upper_bound (abfd) | |
7442e600 | 143 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
144 | { |
145 | return (BIN_SYMS + 1) * sizeof (asymbol *); | |
146 | } | |
147 | ||
148 | /* Create a symbol name based on the bfd's filename. */ | |
149 | ||
150 | static char * | |
151 | mangle_name (abfd, suffix) | |
152 | bfd *abfd; | |
153 | char *suffix; | |
154 | { | |
dc810e39 | 155 | bfd_size_type size; |
252b5132 RH |
156 | char *buf; |
157 | char *p; | |
158 | ||
159 | size = (strlen (bfd_get_filename (abfd)) | |
160 | + strlen (suffix) | |
161 | + sizeof "_binary__"); | |
162 | ||
163 | buf = (char *) bfd_alloc (abfd, size); | |
164 | if (buf == NULL) | |
165 | return ""; | |
166 | ||
167 | sprintf (buf, "_binary_%s_%s", bfd_get_filename (abfd), suffix); | |
168 | ||
169 | /* Change any non-alphanumeric characters to underscores. */ | |
170 | for (p = buf; *p; p++) | |
3882b010 | 171 | if (! ISALNUM (*p)) |
252b5132 RH |
172 | *p = '_'; |
173 | ||
174 | return buf; | |
175 | } | |
176 | ||
177 | /* Return the symbol table. */ | |
178 | ||
179 | static long | |
6cee3f79 | 180 | binary_canonicalize_symtab (abfd, alocation) |
252b5132 RH |
181 | bfd *abfd; |
182 | asymbol **alocation; | |
183 | { | |
184 | asection *sec = (asection *) abfd->tdata.any; | |
185 | asymbol *syms; | |
186 | unsigned int i; | |
dc810e39 | 187 | bfd_size_type amt = BIN_SYMS * sizeof (asymbol); |
252b5132 | 188 | |
dc810e39 | 189 | syms = (asymbol *) bfd_alloc (abfd, amt); |
252b5132 | 190 | if (syms == NULL) |
b34976b6 | 191 | return 0; |
252b5132 RH |
192 | |
193 | /* Start symbol. */ | |
194 | syms[0].the_bfd = abfd; | |
195 | syms[0].name = mangle_name (abfd, "start"); | |
196 | syms[0].value = 0; | |
197 | syms[0].flags = BSF_GLOBAL; | |
198 | syms[0].section = sec; | |
199 | syms[0].udata.p = NULL; | |
200 | ||
201 | /* End symbol. */ | |
202 | syms[1].the_bfd = abfd; | |
203 | syms[1].name = mangle_name (abfd, "end"); | |
204 | syms[1].value = sec->_raw_size; | |
205 | syms[1].flags = BSF_GLOBAL; | |
206 | syms[1].section = sec; | |
207 | syms[1].udata.p = NULL; | |
208 | ||
209 | /* Size symbol. */ | |
210 | syms[2].the_bfd = abfd; | |
211 | syms[2].name = mangle_name (abfd, "size"); | |
212 | syms[2].value = sec->_raw_size; | |
213 | syms[2].flags = BSF_GLOBAL; | |
214 | syms[2].section = bfd_abs_section_ptr; | |
215 | syms[2].udata.p = NULL; | |
216 | ||
217 | for (i = 0; i < BIN_SYMS; i++) | |
218 | *alocation++ = syms++; | |
219 | *alocation = NULL; | |
220 | ||
221 | return BIN_SYMS; | |
222 | } | |
223 | ||
3f3c5c34 | 224 | #define binary_make_empty_symbol _bfd_generic_make_empty_symbol |
252b5132 RH |
225 | #define binary_print_symbol _bfd_nosymbols_print_symbol |
226 | ||
227 | /* Get information about a symbol. */ | |
228 | ||
229 | static void | |
230 | binary_get_symbol_info (ignore_abfd, symbol, ret) | |
7442e600 | 231 | bfd *ignore_abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
232 | asymbol *symbol; |
233 | symbol_info *ret; | |
234 | { | |
235 | bfd_symbol_info (symbol, ret); | |
236 | } | |
237 | ||
238 | #define binary_bfd_is_local_label_name bfd_generic_is_local_label_name | |
239 | #define binary_get_lineno _bfd_nosymbols_get_lineno | |
240 | #define binary_find_nearest_line _bfd_nosymbols_find_nearest_line | |
241 | #define binary_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol | |
242 | #define binary_read_minisymbols _bfd_generic_read_minisymbols | |
243 | #define binary_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol | |
244 | ||
245 | #define binary_get_reloc_upper_bound \ | |
246 | ((long (*) PARAMS ((bfd *, asection *))) bfd_0l) | |
247 | #define binary_canonicalize_reloc \ | |
248 | ((long (*) PARAMS ((bfd *, asection *, arelent **, asymbol **))) bfd_0l) | |
249 | #define binary_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup | |
250 | ||
251 | /* Set the architecture of a binary file. */ | |
252 | #define binary_set_arch_mach _bfd_generic_set_arch_mach | |
253 | ||
254 | /* Write section contents of a binary file. */ | |
255 | ||
b34976b6 | 256 | static bfd_boolean |
252b5132 RH |
257 | binary_set_section_contents (abfd, sec, data, offset, size) |
258 | bfd *abfd; | |
259 | asection *sec; | |
260 | PTR data; | |
261 | file_ptr offset; | |
262 | bfd_size_type size; | |
263 | { | |
3a71aec8 | 264 | if (size == 0) |
b34976b6 | 265 | return TRUE; |
3a71aec8 | 266 | |
252b5132 RH |
267 | if (! abfd->output_has_begun) |
268 | { | |
b34976b6 | 269 | bfd_boolean found_low; |
252b5132 RH |
270 | bfd_vma low; |
271 | asection *s; | |
272 | ||
273 | /* The lowest section LMA sets the virtual address of the start | |
274 | of the file. We use this to set the file position of all the | |
275 | sections. */ | |
b34976b6 | 276 | found_low = FALSE; |
252b5132 RH |
277 | low = 0; |
278 | for (s = abfd->sections; s != NULL; s = s->next) | |
279 | if (((s->flags | |
280 | & (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC | SEC_NEVER_LOAD)) | |
281 | == (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC)) | |
3a71aec8 | 282 | && (s->_raw_size > 0) |
252b5132 RH |
283 | && (! found_low || s->lma < low)) |
284 | { | |
285 | low = s->lma; | |
b34976b6 | 286 | found_low = TRUE; |
252b5132 RH |
287 | } |
288 | ||
289 | for (s = abfd->sections; s != NULL; s = s->next) | |
290 | { | |
291 | s->filepos = s->lma - low; | |
292 | ||
293 | /* Skip following warning check for sections that will not | |
aebad5fe | 294 | occupy file space. */ |
252b5132 RH |
295 | if ((s->flags |
296 | & (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_NEVER_LOAD)) | |
3a71aec8 NC |
297 | != (SEC_HAS_CONTENTS | SEC_ALLOC) |
298 | || (s->_raw_size == 0)) | |
252b5132 RH |
299 | continue; |
300 | ||
301 | /* If attempting to generate a binary file from a bfd with | |
302 | LMA's all over the place, huge (sparse?) binary files may | |
303 | result. This condition attempts to detect this situation | |
304 | and print a warning. Better heuristics would be nice to | |
aebad5fe | 305 | have. */ |
252b5132 RH |
306 | |
307 | if (s->filepos < 0) | |
308 | (*_bfd_error_handler) | |
309 | (_("Warning: Writing section `%s' to huge (ie negative) file offset 0x%lx."), | |
310 | bfd_get_section_name (abfd, s), | |
311 | (unsigned long) s->filepos); | |
312 | } | |
313 | ||
b34976b6 | 314 | abfd->output_has_begun = TRUE; |
252b5132 RH |
315 | } |
316 | ||
317 | /* We don't want to output anything for a section that is neither | |
318 | loaded nor allocated. The contents of such a section are not | |
319 | meaningful in the binary format. */ | |
320 | if ((sec->flags & (SEC_LOAD | SEC_ALLOC)) == 0) | |
b34976b6 | 321 | return TRUE; |
252b5132 | 322 | if ((sec->flags & SEC_NEVER_LOAD) != 0) |
b34976b6 | 323 | return TRUE; |
252b5132 RH |
324 | |
325 | return _bfd_generic_set_section_contents (abfd, sec, data, offset, size); | |
326 | } | |
327 | ||
328 | /* No space is required for header information. */ | |
329 | ||
330 | static int | |
331 | binary_sizeof_headers (abfd, exec) | |
7442e600 | 332 | bfd *abfd ATTRIBUTE_UNUSED; |
b34976b6 | 333 | bfd_boolean exec ATTRIBUTE_UNUSED; |
252b5132 RH |
334 | { |
335 | return 0; | |
336 | } | |
337 | ||
338 | #define binary_bfd_get_relocated_section_contents \ | |
339 | bfd_generic_get_relocated_section_contents | |
340 | #define binary_bfd_relax_section bfd_generic_relax_section | |
341 | #define binary_bfd_gc_sections bfd_generic_gc_sections | |
8550eb6e | 342 | #define binary_bfd_merge_sections bfd_generic_merge_sections |
e61463e1 | 343 | #define binary_bfd_discard_group bfd_generic_discard_group |
252b5132 | 344 | #define binary_bfd_link_hash_table_create _bfd_generic_link_hash_table_create |
e2d34d7d | 345 | #define binary_bfd_link_hash_table_free _bfd_generic_link_hash_table_free |
2d653fc7 | 346 | #define binary_bfd_link_just_syms _bfd_generic_link_just_syms |
252b5132 RH |
347 | #define binary_bfd_link_add_symbols _bfd_generic_link_add_symbols |
348 | #define binary_bfd_final_link _bfd_generic_final_link | |
349 | #define binary_bfd_link_split_section _bfd_generic_link_split_section | |
350 | #define binary_get_section_contents_in_window \ | |
351 | _bfd_generic_get_section_contents_in_window | |
352 | ||
353 | const bfd_target binary_vec = | |
354 | { | |
355 | "binary", /* name */ | |
356 | bfd_target_unknown_flavour, /* flavour */ | |
357 | BFD_ENDIAN_UNKNOWN, /* byteorder */ | |
358 | BFD_ENDIAN_UNKNOWN, /* header_byteorder */ | |
359 | EXEC_P, /* object_flags */ | |
360 | (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA | |
361 | | SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */ | |
362 | 0, /* symbol_leading_char */ | |
363 | ' ', /* ar_pad_char */ | |
364 | 16, /* ar_max_namelen */ | |
365 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, | |
366 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, | |
367 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */ | |
368 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, | |
369 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, | |
370 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ | |
371 | { /* bfd_check_format */ | |
372 | _bfd_dummy_target, | |
373 | binary_object_p, /* bfd_check_format */ | |
374 | _bfd_dummy_target, | |
375 | _bfd_dummy_target, | |
376 | }, | |
377 | { /* bfd_set_format */ | |
378 | bfd_false, | |
379 | binary_mkobject, | |
380 | bfd_false, | |
381 | bfd_false, | |
382 | }, | |
383 | { /* bfd_write_contents */ | |
384 | bfd_false, | |
385 | bfd_true, | |
386 | bfd_false, | |
387 | bfd_false, | |
388 | }, | |
389 | ||
390 | BFD_JUMP_TABLE_GENERIC (binary), | |
391 | BFD_JUMP_TABLE_COPY (_bfd_generic), | |
392 | BFD_JUMP_TABLE_CORE (_bfd_nocore), | |
393 | BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), | |
394 | BFD_JUMP_TABLE_SYMBOLS (binary), | |
395 | BFD_JUMP_TABLE_RELOCS (binary), | |
396 | BFD_JUMP_TABLE_WRITE (binary), | |
397 | BFD_JUMP_TABLE_LINK (binary), | |
398 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), | |
399 | ||
c3c89269 | 400 | NULL, |
aebad5fe | 401 | |
252b5132 RH |
402 | NULL |
403 | }; |