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ffa54e5c | 1 | /* simple-object.c -- simple routines to read and write object files. |
e495212d | 2 | Copyright (C) 2010-2017 Free Software Foundation, Inc. |
ffa54e5c DD |
3 | Written by Ian Lance Taylor, Google. |
4 | ||
5 | This program is free software; you can redistribute it and/or modify it | |
6 | under the terms of the GNU General Public License as published by the | |
7 | Free Software Foundation; either version 2, or (at your option) any | |
8 | later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, 51 Franklin Street - Fifth Floor, | |
18 | Boston, MA 02110-1301, USA. */ | |
19 | ||
20 | #include "config.h" | |
21 | #include "libiberty.h" | |
22 | #include "simple-object.h" | |
23 | ||
24 | #include <errno.h> | |
25 | ||
26 | #ifdef HAVE_STDLIB_H | |
27 | #include <stdlib.h> | |
28 | #endif | |
29 | ||
30 | #ifdef HAVE_STDINT_H | |
31 | #include <stdint.h> | |
32 | #endif | |
33 | ||
34 | #ifdef HAVE_STRING_H | |
35 | #include <string.h> | |
36 | #endif | |
37 | ||
38 | #ifdef HAVE_INTTYPES_H | |
39 | #include <inttypes.h> | |
40 | #endif | |
41 | ||
42 | #ifndef SEEK_SET | |
43 | #define SEEK_SET 0 | |
44 | #endif | |
45 | ||
46 | #include "simple-object-common.h" | |
47 | ||
48 | /* The known object file formats. */ | |
49 | ||
50 | static const struct simple_object_functions * const format_functions[] = | |
51 | { | |
52 | &simple_object_elf_functions, | |
53 | &simple_object_mach_o_functions, | |
07a8e9f0 DD |
54 | &simple_object_coff_functions, |
55 | &simple_object_xcoff_functions | |
ffa54e5c DD |
56 | }; |
57 | ||
58 | /* Read data from a file using the simple_object error reporting | |
59 | conventions. */ | |
60 | ||
61 | int | |
62 | simple_object_internal_read (int descriptor, off_t offset, | |
63 | unsigned char *buffer, size_t size, | |
64 | const char **errmsg, int *err) | |
65 | { | |
ffa54e5c DD |
66 | if (lseek (descriptor, offset, SEEK_SET) < 0) |
67 | { | |
68 | *errmsg = "lseek"; | |
69 | *err = errno; | |
70 | return 0; | |
71 | } | |
72 | ||
81ad11e3 | 73 | do |
ffa54e5c | 74 | { |
81ad11e3 | 75 | ssize_t got = read (descriptor, buffer, size); |
76 | if (got == 0) | |
77 | break; | |
78 | else if (got > 0) | |
79 | { | |
80 | buffer += got; | |
81 | size -= got; | |
82 | } | |
83 | else if (errno != EINTR) | |
84 | { | |
85 | *errmsg = "read"; | |
86 | *err = errno; | |
87 | return 0; | |
88 | } | |
ffa54e5c | 89 | } |
81ad11e3 | 90 | while (size > 0); |
ffa54e5c | 91 | |
81ad11e3 | 92 | if (size > 0) |
ffa54e5c DD |
93 | { |
94 | *errmsg = "file too short"; | |
95 | *err = 0; | |
96 | return 0; | |
97 | } | |
98 | ||
99 | return 1; | |
100 | } | |
101 | ||
102 | /* Write data to a file using the simple_object error reporting | |
103 | conventions. */ | |
104 | ||
105 | int | |
106 | simple_object_internal_write (int descriptor, off_t offset, | |
107 | const unsigned char *buffer, size_t size, | |
108 | const char **errmsg, int *err) | |
109 | { | |
ffa54e5c DD |
110 | if (lseek (descriptor, offset, SEEK_SET) < 0) |
111 | { | |
112 | *errmsg = "lseek"; | |
113 | *err = errno; | |
114 | return 0; | |
115 | } | |
116 | ||
c3c3c691 | 117 | do |
ffa54e5c | 118 | { |
c3c3c691 | 119 | ssize_t wrote = write (descriptor, buffer, size); |
120 | if (wrote == 0) | |
121 | break; | |
122 | else if (wrote > 0) | |
123 | { | |
124 | buffer += wrote; | |
125 | size -= wrote; | |
126 | } | |
127 | else if (errno != EINTR) | |
128 | { | |
129 | *errmsg = "write"; | |
130 | *err = errno; | |
131 | return 0; | |
132 | } | |
ffa54e5c | 133 | } |
c3c3c691 | 134 | while (size > 0); |
ffa54e5c | 135 | |
c3c3c691 | 136 | if (size > 0) |
ffa54e5c DD |
137 | { |
138 | *errmsg = "short write"; | |
139 | *err = 0; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | return 1; | |
144 | } | |
145 | ||
146 | /* Open for read. */ | |
147 | ||
148 | simple_object_read * | |
149 | simple_object_start_read (int descriptor, off_t offset, | |
150 | const char *segment_name, const char **errmsg, | |
151 | int *err) | |
152 | { | |
153 | unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN]; | |
154 | size_t len, i; | |
155 | ||
156 | if (!simple_object_internal_read (descriptor, offset, header, | |
157 | SIMPLE_OBJECT_MATCH_HEADER_LEN, | |
158 | errmsg, err)) | |
159 | return NULL; | |
160 | ||
161 | len = sizeof (format_functions) / sizeof (format_functions[0]); | |
162 | for (i = 0; i < len; ++i) | |
163 | { | |
164 | void *data; | |
165 | ||
166 | data = format_functions[i]->match (header, descriptor, offset, | |
167 | segment_name, errmsg, err); | |
168 | if (data != NULL) | |
169 | { | |
170 | simple_object_read *ret; | |
171 | ||
172 | ret = XNEW (simple_object_read); | |
173 | ret->descriptor = descriptor; | |
174 | ret->offset = offset; | |
175 | ret->functions = format_functions[i]; | |
176 | ret->data = data; | |
177 | return ret; | |
178 | } | |
179 | } | |
180 | ||
181 | *errmsg = "file not recognized"; | |
182 | *err = 0; | |
183 | return NULL; | |
184 | } | |
185 | ||
186 | /* Find all sections. */ | |
187 | ||
188 | const char * | |
189 | simple_object_find_sections (simple_object_read *sobj, | |
190 | int (*pfn) (void *, const char *, off_t, off_t), | |
191 | void *data, | |
192 | int *err) | |
193 | { | |
194 | return sobj->functions->find_sections (sobj, pfn, data, err); | |
195 | } | |
196 | ||
197 | /* Internal data passed to find_one_section. */ | |
198 | ||
199 | struct find_one_section_data | |
200 | { | |
201 | /* The section we are looking for. */ | |
202 | const char *name; | |
203 | /* Where to store the section offset. */ | |
204 | off_t *offset; | |
205 | /* Where to store the section length. */ | |
206 | off_t *length; | |
207 | /* Set if the name is found. */ | |
208 | int found; | |
209 | }; | |
210 | ||
211 | /* Internal function passed to find_sections. */ | |
212 | ||
213 | static int | |
214 | find_one_section (void *data, const char *name, off_t offset, off_t length) | |
215 | { | |
216 | struct find_one_section_data *fosd = (struct find_one_section_data *) data; | |
217 | ||
218 | if (strcmp (name, fosd->name) != 0) | |
219 | return 1; | |
220 | ||
221 | *fosd->offset = offset; | |
222 | *fosd->length = length; | |
223 | fosd->found = 1; | |
224 | ||
225 | /* Stop iteration. */ | |
226 | return 0; | |
227 | } | |
228 | ||
229 | /* Find a section. */ | |
230 | ||
231 | int | |
232 | simple_object_find_section (simple_object_read *sobj, const char *name, | |
233 | off_t *offset, off_t *length, | |
234 | const char **errmsg, int *err) | |
235 | { | |
236 | struct find_one_section_data fosd; | |
237 | ||
238 | fosd.name = name; | |
239 | fosd.offset = offset; | |
240 | fosd.length = length; | |
241 | fosd.found = 0; | |
242 | ||
243 | *errmsg = simple_object_find_sections (sobj, find_one_section, | |
244 | (void *) &fosd, err); | |
245 | if (*errmsg != NULL) | |
246 | return 0; | |
247 | if (!fosd.found) | |
248 | return 0; | |
249 | return 1; | |
250 | } | |
251 | ||
252 | /* Fetch attributes. */ | |
253 | ||
254 | simple_object_attributes * | |
255 | simple_object_fetch_attributes (simple_object_read *sobj, const char **errmsg, | |
256 | int *err) | |
257 | { | |
258 | void *data; | |
259 | simple_object_attributes *ret; | |
260 | ||
261 | data = sobj->functions->fetch_attributes (sobj, errmsg, err); | |
262 | if (data == NULL) | |
263 | return NULL; | |
264 | ret = XNEW (simple_object_attributes); | |
265 | ret->functions = sobj->functions; | |
266 | ret->data = data; | |
267 | return ret; | |
268 | } | |
269 | ||
270 | /* Release an simple_object_read. */ | |
271 | ||
272 | void | |
273 | simple_object_release_read (simple_object_read *sobj) | |
274 | { | |
275 | sobj->functions->release_read (sobj->data); | |
276 | XDELETE (sobj); | |
277 | } | |
278 | ||
f9e6589d | 279 | /* Merge attributes. */ |
ffa54e5c DD |
280 | |
281 | const char * | |
f9e6589d DD |
282 | simple_object_attributes_merge (simple_object_attributes *to, |
283 | simple_object_attributes *from, | |
284 | int *err) | |
ffa54e5c | 285 | { |
f9e6589d | 286 | if (to->functions != from->functions) |
ffa54e5c DD |
287 | { |
288 | *err = 0; | |
289 | return "different object file format"; | |
290 | } | |
f9e6589d | 291 | return to->functions->attributes_merge (to->data, from->data, err); |
ffa54e5c DD |
292 | } |
293 | ||
294 | /* Release an attributes structure. */ | |
295 | ||
296 | void | |
297 | simple_object_release_attributes (simple_object_attributes *attrs) | |
298 | { | |
299 | attrs->functions->release_attributes (attrs->data); | |
300 | XDELETE (attrs); | |
301 | } | |
302 | ||
303 | /* Start creating an object file. */ | |
304 | ||
305 | simple_object_write * | |
306 | simple_object_start_write (simple_object_attributes *attrs, | |
307 | const char *segment_name, const char **errmsg, | |
308 | int *err) | |
309 | { | |
310 | void *data; | |
311 | simple_object_write *ret; | |
312 | ||
313 | data = attrs->functions->start_write (attrs->data, errmsg, err); | |
314 | if (data == NULL) | |
315 | return NULL; | |
316 | ret = XNEW (simple_object_write); | |
317 | ret->functions = attrs->functions; | |
318 | ret->segment_name = xstrdup (segment_name); | |
319 | ret->sections = NULL; | |
320 | ret->last_section = NULL; | |
321 | ret->data = data; | |
322 | return ret; | |
323 | } | |
324 | ||
325 | /* Start creating a section. */ | |
326 | ||
327 | simple_object_write_section * | |
328 | simple_object_write_create_section (simple_object_write *sobj, const char *name, | |
329 | unsigned int align, | |
330 | const char **errmsg ATTRIBUTE_UNUSED, | |
331 | int *err ATTRIBUTE_UNUSED) | |
332 | { | |
333 | simple_object_write_section *ret; | |
334 | ||
335 | ret = XNEW (simple_object_write_section); | |
336 | ret->next = NULL; | |
337 | ret->name = xstrdup (name); | |
338 | ret->align = align; | |
339 | ret->buffers = NULL; | |
340 | ret->last_buffer = NULL; | |
341 | ||
342 | if (sobj->last_section == NULL) | |
343 | { | |
344 | sobj->sections = ret; | |
345 | sobj->last_section = ret; | |
346 | } | |
347 | else | |
348 | { | |
349 | sobj->last_section->next = ret; | |
350 | sobj->last_section = ret; | |
351 | } | |
352 | ||
353 | return ret; | |
354 | } | |
355 | ||
356 | /* Add data to a section. */ | |
357 | ||
358 | const char * | |
359 | simple_object_write_add_data (simple_object_write *sobj ATTRIBUTE_UNUSED, | |
360 | simple_object_write_section *section, | |
361 | const void *buffer, | |
362 | size_t size, int copy, | |
363 | int *err ATTRIBUTE_UNUSED) | |
364 | { | |
365 | struct simple_object_write_section_buffer *wsb; | |
366 | ||
367 | wsb = XNEW (struct simple_object_write_section_buffer); | |
368 | wsb->next = NULL; | |
369 | wsb->size = size; | |
370 | ||
371 | if (!copy) | |
372 | { | |
373 | wsb->buffer = buffer; | |
374 | wsb->free_buffer = NULL; | |
375 | } | |
376 | else | |
377 | { | |
378 | wsb->free_buffer = (void *) XNEWVEC (char, size); | |
379 | memcpy (wsb->free_buffer, buffer, size); | |
380 | wsb->buffer = wsb->free_buffer; | |
381 | } | |
382 | ||
383 | if (section->last_buffer == NULL) | |
384 | { | |
385 | section->buffers = wsb; | |
386 | section->last_buffer = wsb; | |
387 | } | |
388 | else | |
389 | { | |
390 | section->last_buffer->next = wsb; | |
391 | section->last_buffer = wsb; | |
392 | } | |
393 | ||
394 | return NULL; | |
395 | } | |
396 | ||
397 | /* Write the complete object file. */ | |
398 | ||
399 | const char * | |
400 | simple_object_write_to_file (simple_object_write *sobj, int descriptor, | |
401 | int *err) | |
402 | { | |
403 | return sobj->functions->write_to_file (sobj, descriptor, err); | |
404 | } | |
405 | ||
406 | /* Release an simple_object_write. */ | |
407 | ||
408 | void | |
409 | simple_object_release_write (simple_object_write *sobj) | |
410 | { | |
411 | simple_object_write_section *section; | |
412 | ||
413 | free (sobj->segment_name); | |
414 | ||
415 | section = sobj->sections; | |
416 | while (section != NULL) | |
417 | { | |
418 | struct simple_object_write_section_buffer *buffer; | |
419 | simple_object_write_section *next_section; | |
420 | ||
421 | buffer = section->buffers; | |
422 | while (buffer != NULL) | |
423 | { | |
424 | struct simple_object_write_section_buffer *next_buffer; | |
425 | ||
426 | if (buffer->free_buffer != NULL) | |
427 | XDELETEVEC (buffer->free_buffer); | |
428 | next_buffer = buffer->next; | |
429 | XDELETE (buffer); | |
430 | buffer = next_buffer; | |
431 | } | |
432 | ||
433 | next_section = section->next; | |
434 | free (section->name); | |
435 | XDELETE (section); | |
436 | section = next_section; | |
437 | } | |
438 | ||
439 | sobj->functions->release_write (sobj->data); | |
440 | XDELETE (sobj); | |
441 | } |