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c768bd3f | 1 | /* BFD back-end for binary objects. |
a96acce3 | 2 | Copyright 1994, 95, 96, 97, 98, 1999 Free Software Foundation, Inc. |
c768bd3f ILT |
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 | |
a5655244 | 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
c768bd3f ILT |
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 | ||
a5655244 ILT |
34 | #include <ctype.h> |
35 | ||
c768bd3f ILT |
36 | #include "bfd.h" |
37 | #include "sysdep.h" | |
38 | #include "libbfd.h" | |
39 | ||
a5655244 ILT |
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 | ||
c768bd3f | 44 | static boolean binary_mkobject PARAMS ((bfd *)); |
a5655244 ILT |
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 **)); | |
c768bd3f | 51 | static asymbol *binary_make_empty_symbol PARAMS ((bfd *)); |
a5655244 | 52 | static void binary_get_symbol_info PARAMS ((bfd *, asymbol *, symbol_info *)); |
c768bd3f ILT |
53 | static boolean binary_set_section_contents |
54 | PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type)); | |
a5655244 | 55 | static int binary_sizeof_headers PARAMS ((bfd *, boolean)); |
c768bd3f ILT |
56 | |
57 | /* Create a binary object. Invoked via bfd_set_format. */ | |
58 | ||
59 | static boolean | |
60 | binary_mkobject (abfd) | |
61 | bfd *abfd; | |
62 | { | |
63 | return true; | |
64 | } | |
65 | ||
a5655244 ILT |
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; | |
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; | |
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) | |
a9713b91 | 152 | return ""; |
a5655244 ILT |
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++) | |
223fff66 | 158 | if (! isalnum ((unsigned char) *p)) |
a5655244 ILT |
159 | *p = '_'; |
160 | ||
161 | return buf; | |
162 | } | |
c768bd3f | 163 | |
a5655244 ILT |
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) | |
a9713b91 | 177 | return false; |
a5655244 ILT |
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. */ | |
c768bd3f ILT |
211 | |
212 | static asymbol * | |
213 | binary_make_empty_symbol (abfd) | |
214 | bfd *abfd; | |
215 | { | |
a9713b91 | 216 | return (asymbol *) bfd_alloc (abfd, sizeof (asymbol)); |
c768bd3f ILT |
217 | } |
218 | ||
a5655244 ILT |
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; | |
226 | asymbol *symbol; | |
227 | symbol_info *ret; | |
228 | { | |
229 | bfd_symbol_info (symbol, ret); | |
230 | } | |
231 | ||
223fff66 | 232 | #define binary_bfd_is_local_label_name bfd_generic_is_local_label_name |
a5655244 ILT |
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 | ||
c768bd3f ILT |
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 | { | |
a5655244 | 258 | if (! abfd->output_has_begun) |
c768bd3f | 259 | { |
223fff66 | 260 | boolean found_low; |
a5655244 ILT |
261 | bfd_vma low; |
262 | asection *s; | |
263 | ||
223fff66 FCE |
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 | |
a5655244 | 266 | sections. */ |
223fff66 FCE |
267 | found_low = false; |
268 | low = 0; | |
269 | for (s = abfd->sections; s != NULL; s = s->next) | |
a96acce3 ILT |
270 | if (((s->flags |
271 | & (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC | SEC_NEVER_LOAD)) | |
223fff66 FCE |
272 | == (SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC)) |
273 | && (! found_low || s->lma < low)) | |
274 | { | |
275 | low = s->lma; | |
276 | found_low = true; | |
277 | } | |
a5655244 ILT |
278 | |
279 | for (s = abfd->sections; s != NULL; s = s->next) | |
223fff66 FCE |
280 | { |
281 | s->filepos = s->lma - low; | |
282 | ||
283 | /* If attempting to generate a binary file from a bfd with | |
284 | LMA's all over the place, huge (sparse?) binary files may | |
285 | result. This condition attempts to detect this situation | |
286 | and print a warning. Better heuristics would be nice to | |
287 | have. */ | |
288 | ||
289 | if (s->filepos < 0) | |
290 | (*_bfd_error_handler) | |
291 | (_("Warning: Writing section `%s' to huge offset %lu."), | |
292 | bfd_get_section_name (abfd, s), | |
293 | (unsigned long) s->filepos); | |
294 | } | |
a5655244 ILT |
295 | |
296 | abfd->output_has_begun = true; | |
c768bd3f ILT |
297 | } |
298 | ||
a96acce3 ILT |
299 | /* We don't want to output anything for a section that is neither |
300 | loaded nor allocated. The contents of such a section are not | |
301 | meaningful in the binary format. */ | |
302 | if ((sec->flags & (SEC_LOAD | SEC_ALLOC)) == 0) | |
303 | return true; | |
304 | if ((sec->flags & SEC_NEVER_LOAD) != 0) | |
305 | return true; | |
306 | ||
c768bd3f ILT |
307 | return _bfd_generic_set_section_contents (abfd, sec, data, offset, size); |
308 | } | |
309 | ||
a5655244 ILT |
310 | /* No space is required for header information. */ |
311 | ||
312 | static int | |
313 | binary_sizeof_headers (abfd, exec) | |
314 | bfd *abfd; | |
315 | boolean exec; | |
316 | { | |
317 | return 0; | |
318 | } | |
319 | ||
320 | #define binary_bfd_get_relocated_section_contents \ | |
321 | bfd_generic_get_relocated_section_contents | |
322 | #define binary_bfd_relax_section bfd_generic_relax_section | |
223fff66 | 323 | #define binary_bfd_gc_sections bfd_generic_gc_sections |
a5655244 ILT |
324 | #define binary_bfd_link_hash_table_create _bfd_generic_link_hash_table_create |
325 | #define binary_bfd_link_add_symbols _bfd_generic_link_add_symbols | |
326 | #define binary_bfd_final_link _bfd_generic_final_link | |
327 | #define binary_bfd_link_split_section _bfd_generic_link_split_section | |
a9713b91 ILT |
328 | #define binary_get_section_contents_in_window \ |
329 | _bfd_generic_get_section_contents_in_window | |
a5655244 | 330 | |
c768bd3f ILT |
331 | const bfd_target binary_vec = |
332 | { | |
333 | "binary", /* name */ | |
334 | bfd_target_unknown_flavour, /* flavour */ | |
223fff66 FCE |
335 | BFD_ENDIAN_UNKNOWN, /* byteorder */ |
336 | BFD_ENDIAN_UNKNOWN, /* header_byteorder */ | |
c768bd3f ILT |
337 | EXEC_P, /* object_flags */ |
338 | (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA | |
339 | | SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */ | |
340 | 0, /* symbol_leading_char */ | |
341 | ' ', /* ar_pad_char */ | |
342 | 16, /* ar_max_namelen */ | |
c768bd3f ILT |
343 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, |
344 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, | |
345 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */ | |
346 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, | |
347 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, | |
348 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ | |
349 | { /* bfd_check_format */ | |
350 | _bfd_dummy_target, | |
a5655244 | 351 | binary_object_p, /* bfd_check_format */ |
c768bd3f ILT |
352 | _bfd_dummy_target, |
353 | _bfd_dummy_target, | |
354 | }, | |
355 | { /* bfd_set_format */ | |
356 | bfd_false, | |
357 | binary_mkobject, | |
358 | bfd_false, | |
359 | bfd_false, | |
360 | }, | |
361 | { /* bfd_write_contents */ | |
362 | bfd_false, | |
363 | bfd_true, | |
364 | bfd_false, | |
365 | bfd_false, | |
366 | }, | |
367 | ||
a5655244 | 368 | BFD_JUMP_TABLE_GENERIC (binary), |
c768bd3f ILT |
369 | BFD_JUMP_TABLE_COPY (_bfd_generic), |
370 | BFD_JUMP_TABLE_CORE (_bfd_nocore), | |
371 | BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), | |
372 | BFD_JUMP_TABLE_SYMBOLS (binary), | |
a5655244 | 373 | BFD_JUMP_TABLE_RELOCS (binary), |
c768bd3f | 374 | BFD_JUMP_TABLE_WRITE (binary), |
a5655244 | 375 | BFD_JUMP_TABLE_LINK (binary), |
c768bd3f ILT |
376 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), |
377 | ||
378 | NULL | |
379 | }; |