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ce3c775b NC |
1 | /* Plugin support for BFD. |
2 | Copyright 2009 | |
3 | Free Software Foundation, Inc. | |
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 3 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., 51 Franklin Street - Fifth Floor, Boston, | |
20 | MA 02110-1301, USA. */ | |
21 | ||
22 | #include "config.h" | |
98950613 AM |
23 | #include "bfd.h" |
24 | ||
25 | #if BFD_SUPPORTS_PLUGINS | |
26 | ||
ce3c775b NC |
27 | #include <assert.h> |
28 | #include <dlfcn.h> | |
29 | #include <stdarg.h> | |
30 | #include "plugin-api.h" | |
31 | #include "sysdep.h" | |
32 | #include "plugin.h" | |
33 | #include "libbfd.h" | |
34 | #include "libiberty.h" | |
35 | #include <dirent.h> | |
36 | ||
37 | #define bfd_plugin_close_and_cleanup _bfd_generic_close_and_cleanup | |
38 | #define bfd_plugin_bfd_free_cached_info _bfd_generic_bfd_free_cached_info | |
39 | #define bfd_plugin_new_section_hook _bfd_generic_new_section_hook | |
40 | #define bfd_plugin_get_section_contents _bfd_generic_get_section_contents | |
41 | #define bfd_plugin_get_section_contents_in_window _bfd_generic_get_section_contents_in_window | |
42 | #define bfd_plugin_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data | |
43 | #define bfd_plugin_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data | |
44 | #define bfd_plugin_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data | |
45 | #define bfd_plugin_bfd_set_private_flags _bfd_generic_bfd_set_private_flags | |
46 | #define bfd_plugin_core_file_matches_executable_p generic_core_file_matches_executable_p | |
47 | #define bfd_plugin_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name | |
48 | #define bfd_plugin_bfd_is_target_special_symbol ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false) | |
49 | #define bfd_plugin_get_lineno _bfd_nosymbols_get_lineno | |
50 | #define bfd_plugin_find_nearest_line _bfd_nosymbols_find_nearest_line | |
51 | #define bfd_plugin_find_inliner_info _bfd_nosymbols_find_inliner_info | |
52 | #define bfd_plugin_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol | |
53 | #define bfd_plugin_read_minisymbols _bfd_generic_read_minisymbols | |
54 | #define bfd_plugin_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol | |
55 | #define bfd_plugin_set_arch_mach bfd_default_set_arch_mach | |
56 | #define bfd_plugin_set_section_contents _bfd_generic_set_section_contents | |
57 | #define bfd_plugin_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents | |
58 | #define bfd_plugin_bfd_relax_section bfd_generic_relax_section | |
59 | #define bfd_plugin_bfd_link_hash_table_create _bfd_generic_link_hash_table_create | |
60 | #define bfd_plugin_bfd_link_hash_table_free _bfd_generic_link_hash_table_free | |
61 | #define bfd_plugin_bfd_link_add_symbols _bfd_generic_link_add_symbols | |
62 | #define bfd_plugin_bfd_link_just_syms _bfd_generic_link_just_syms | |
63 | #define bfd_plugin_bfd_final_link _bfd_generic_final_link | |
64 | #define bfd_plugin_bfd_link_split_section _bfd_generic_link_split_section | |
65 | #define bfd_plugin_bfd_gc_sections bfd_generic_gc_sections | |
66 | #define bfd_plugin_bfd_merge_sections bfd_generic_merge_sections | |
67 | #define bfd_plugin_bfd_is_group_section bfd_generic_is_group_section | |
68 | #define bfd_plugin_bfd_discard_group bfd_generic_discard_group | |
69 | #define bfd_plugin_section_already_linked _bfd_generic_section_already_linked | |
70 | #define bfd_plugin_bfd_define_common_symbol bfd_generic_define_common_symbol | |
71 | ||
72 | static enum ld_plugin_status | |
73 | message (int level ATTRIBUTE_UNUSED, | |
74 | const char * format, ...) | |
75 | { | |
76 | va_list args; | |
77 | va_start (args, format); | |
78 | printf ("bfd plugin: "); | |
79 | vprintf (format, args); | |
80 | va_end (args); | |
81 | return LDPS_OK; | |
82 | } | |
83 | ||
84 | /* Register a claim-file handler. */ | |
85 | static ld_plugin_claim_file_handler claim_file; | |
86 | ||
87 | static enum ld_plugin_status | |
88 | register_claim_file (ld_plugin_claim_file_handler handler) | |
89 | { | |
90 | claim_file = handler; | |
91 | return LDPS_OK; | |
92 | } | |
93 | ||
94 | static enum ld_plugin_status | |
95 | add_symbols (void * handle, | |
96 | int nsyms, | |
97 | const struct ld_plugin_symbol * syms) | |
98 | { | |
99 | bfd *abfd = handle; | |
100 | struct plugin_data_struct *plugin_data = | |
101 | bfd_alloc (abfd, sizeof (plugin_data_struct));; | |
102 | ||
103 | plugin_data->nsyms = nsyms; | |
104 | plugin_data->syms = syms; | |
105 | ||
106 | if (nsyms != 0) | |
107 | abfd->flags |= HAS_SYMS; | |
108 | ||
109 | abfd->tdata.plugin_data = plugin_data; | |
110 | return LDPS_OK; | |
111 | } | |
112 | ||
fc579192 NC |
113 | static const char *plugin_program_name; |
114 | ||
115 | void | |
116 | bfd_plugin_set_program_name (const char *program_name) | |
117 | { | |
118 | plugin_program_name = program_name; | |
119 | } | |
ce3c775b NC |
120 | |
121 | static int | |
122 | try_load_plugin (const char *pname) | |
123 | { | |
124 | static void *plugin_handle; | |
125 | int tv_size = 4; | |
126 | struct ld_plugin_tv tv[tv_size]; | |
127 | int i; | |
128 | ld_plugin_onload onload; | |
129 | enum ld_plugin_status status; | |
130 | ||
131 | plugin_handle = dlopen (pname, RTLD_NOW); | |
132 | if (!plugin_handle) | |
133 | { | |
134 | (*_bfd_error_handler)("%s\n", dlerror ()); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | onload = dlsym (plugin_handle, "onload"); | |
139 | if (!onload) | |
140 | goto err; | |
141 | ||
142 | i = 0; | |
143 | tv[i].tv_tag = LDPT_MESSAGE; | |
144 | tv[i].tv_u.tv_message = message; | |
145 | ||
146 | ++i; | |
147 | tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK; | |
148 | tv[i].tv_u.tv_register_claim_file = register_claim_file; | |
149 | ||
150 | ++i; | |
151 | tv[i].tv_tag = LDPT_ADD_SYMBOLS; | |
152 | tv[i].tv_u.tv_add_symbols = add_symbols; | |
153 | ||
154 | ++i; | |
155 | tv[i].tv_tag = LDPT_NULL; | |
156 | tv[i].tv_u.tv_val = 0; | |
157 | ||
158 | status = (*onload)(tv); | |
159 | ||
160 | if (status != LDPS_OK) | |
161 | goto err; | |
162 | ||
163 | if (!claim_file) | |
164 | goto err; | |
165 | ||
166 | return 1; | |
167 | ||
168 | err: | |
169 | plugin_handle = NULL; | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static const char *plugin_name; | |
174 | ||
175 | void | |
176 | bfd_plugin_set_plugin (const char *p) | |
177 | { | |
178 | plugin_name = p; | |
179 | } | |
180 | ||
181 | static int | |
182 | load_plugin (void) | |
183 | { | |
184 | char *plugin_dir; | |
185 | char *p; | |
186 | DIR *d; | |
187 | struct dirent *ent; | |
188 | int found = 0; | |
189 | ||
190 | if (plugin_name) | |
191 | return try_load_plugin (plugin_name); | |
192 | ||
fc579192 | 193 | if (plugin_program_name == NULL) |
ce3c775b NC |
194 | return 0; |
195 | ||
196 | plugin_dir = concat (BINDIR, "/../lib/bfd-plugins", NULL); | |
fc579192 | 197 | p = make_relative_prefix (plugin_program_name, |
ce3c775b NC |
198 | BINDIR, |
199 | plugin_dir); | |
200 | free (plugin_dir); | |
201 | plugin_dir = NULL; | |
202 | ||
203 | d = opendir (p); | |
204 | if (!d) | |
205 | goto out; | |
206 | ||
207 | while ((ent = readdir (d))) | |
208 | { | |
209 | char *full_name; | |
c41ba836 | 210 | struct stat s; |
ce3c775b NC |
211 | |
212 | full_name = concat (p, "/", ent->d_name, NULL); | |
c41ba836 DK |
213 | if (stat(full_name, &s) == 0 && S_ISREG (s.st_mode)) |
214 | found = try_load_plugin (full_name); | |
ce3c775b NC |
215 | free (full_name); |
216 | if (found) | |
217 | break; | |
218 | } | |
219 | ||
220 | out: | |
221 | free (p); | |
222 | if (d) | |
223 | closedir (d); | |
224 | ||
225 | return found; | |
226 | } | |
227 | ||
228 | ||
229 | static const bfd_target * | |
230 | bfd_plugin_object_p (bfd *abfd) | |
231 | { | |
232 | int claimed = 0; | |
233 | int t = load_plugin (); | |
234 | struct ld_plugin_input_file file; | |
235 | if (!t) | |
236 | return NULL; | |
237 | ||
238 | file.name = abfd->filename; | |
239 | ||
240 | if (abfd->iostream) | |
241 | { | |
242 | file.fd = fileno (abfd->iostream); | |
243 | file.offset = 0; | |
244 | file.filesize = 0; /*FIXME*/ | |
245 | } | |
246 | else | |
247 | { | |
248 | bfd *archive = abfd->my_archive; | |
249 | BFD_ASSERT (archive); | |
250 | file.fd = fileno (archive->iostream); | |
251 | file.offset = abfd->origin; | |
252 | file.filesize = arelt_size (abfd); | |
253 | ||
254 | } | |
255 | file.handle = abfd; | |
256 | claim_file (&file, &claimed); | |
257 | if (!claimed) | |
258 | return NULL; | |
259 | ||
260 | return abfd->xvec; | |
261 | } | |
262 | ||
263 | /* Copy any private info we understand from the input bfd | |
264 | to the output bfd. */ | |
265 | ||
266 | static bfd_boolean | |
267 | bfd_plugin_bfd_copy_private_bfd_data (bfd *ibfd ATTRIBUTE_UNUSED, | |
268 | bfd *obfd ATTRIBUTE_UNUSED) | |
269 | { | |
270 | BFD_ASSERT (0); | |
271 | return TRUE; | |
272 | } | |
273 | ||
274 | /* Copy any private info we understand from the input section | |
275 | to the output section. */ | |
276 | ||
277 | static bfd_boolean | |
278 | bfd_plugin_bfd_copy_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED, | |
279 | asection *isection ATTRIBUTE_UNUSED, | |
280 | bfd *obfd ATTRIBUTE_UNUSED, | |
281 | asection *osection ATTRIBUTE_UNUSED) | |
282 | { | |
283 | BFD_ASSERT (0); | |
284 | return TRUE; | |
285 | } | |
286 | ||
287 | /* Copy any private info we understand from the input symbol | |
288 | to the output symbol. */ | |
289 | ||
290 | static bfd_boolean | |
291 | bfd_plugin_bfd_copy_private_symbol_data (bfd *ibfd ATTRIBUTE_UNUSED, | |
292 | asymbol *isymbol ATTRIBUTE_UNUSED, | |
293 | bfd *obfd ATTRIBUTE_UNUSED, | |
294 | asymbol *osymbol ATTRIBUTE_UNUSED) | |
295 | { | |
296 | BFD_ASSERT (0); | |
297 | return TRUE; | |
298 | } | |
299 | ||
300 | static bfd_boolean | |
301 | bfd_plugin_bfd_print_private_bfd_data (bfd *abfd ATTRIBUTE_UNUSED, PTR ptr ATTRIBUTE_UNUSED) | |
302 | { | |
303 | BFD_ASSERT (0); | |
304 | return TRUE; | |
305 | } | |
306 | ||
307 | static char * | |
308 | bfd_plugin_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED) | |
309 | { | |
310 | BFD_ASSERT (0); | |
311 | return NULL; | |
312 | } | |
313 | ||
314 | static int | |
315 | bfd_plugin_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED) | |
316 | { | |
317 | BFD_ASSERT (0); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static long | |
322 | bfd_plugin_get_symtab_upper_bound (bfd *abfd) | |
323 | { | |
324 | struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data; | |
325 | long nsyms = plugin_data->nsyms; | |
326 | ||
327 | BFD_ASSERT (nsyms >= 0); | |
328 | ||
329 | return ((nsyms + 1) * sizeof (asymbol *)); | |
330 | } | |
331 | ||
332 | static flagword | |
333 | convert_flags (const struct ld_plugin_symbol *sym) | |
334 | { | |
335 | switch (sym->def) | |
336 | { | |
337 | case LDPK_DEF: | |
338 | case LDPK_COMMON: | |
339 | case LDPK_UNDEF: | |
340 | return BSF_GLOBAL; | |
341 | ||
342 | case LDPK_WEAKUNDEF: | |
343 | case LDPK_WEAKDEF: | |
344 | return BSF_GLOBAL | BSF_WEAK; | |
345 | ||
346 | default: | |
347 | BFD_ASSERT (0); | |
348 | return 0; | |
349 | } | |
350 | } | |
351 | ||
352 | static long | |
353 | bfd_plugin_canonicalize_symtab (bfd *abfd, | |
354 | asymbol **alocation) | |
355 | { | |
356 | struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data; | |
357 | long nsyms = plugin_data->nsyms; | |
358 | const struct ld_plugin_symbol *syms = plugin_data->syms; | |
359 | static asection fake_section; | |
360 | static asection fake_common_section; | |
361 | int i; | |
362 | ||
363 | fake_section.name = ".text"; | |
364 | fake_common_section.flags = SEC_IS_COMMON; | |
365 | ||
366 | for (i = 0; i < nsyms; i++) | |
367 | { | |
368 | asymbol *s = bfd_alloc (abfd, sizeof (asymbol)); | |
369 | ||
370 | BFD_ASSERT (s); | |
371 | alocation[i] = s; | |
372 | ||
373 | s->the_bfd = abfd; | |
374 | s->name = syms[i].name; | |
375 | s->value = 0; | |
376 | s->flags = convert_flags (&syms[i]); | |
377 | switch (syms[i].def) | |
378 | { | |
379 | case LDPK_COMMON: | |
380 | s->section = &fake_common_section; | |
381 | break; | |
382 | case LDPK_UNDEF: | |
383 | case LDPK_WEAKUNDEF: | |
384 | s->section = bfd_und_section_ptr; | |
385 | break; | |
386 | case LDPK_DEF: | |
387 | case LDPK_WEAKDEF: | |
388 | s->section = &fake_section; | |
389 | break; | |
390 | default: | |
391 | BFD_ASSERT (0); | |
392 | } | |
393 | ||
394 | s->udata.p = (void *) &syms[i]; | |
395 | } | |
396 | ||
397 | return nsyms; | |
398 | } | |
399 | ||
400 | static void | |
401 | bfd_plugin_print_symbol (bfd *abfd ATTRIBUTE_UNUSED, | |
402 | PTR afile ATTRIBUTE_UNUSED, | |
403 | asymbol *symbol ATTRIBUTE_UNUSED, | |
404 | bfd_print_symbol_type how ATTRIBUTE_UNUSED) | |
405 | { | |
406 | BFD_ASSERT (0); | |
407 | } | |
408 | ||
409 | static void | |
410 | bfd_plugin_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED, | |
411 | asymbol *symbol, | |
412 | symbol_info *ret) | |
413 | { | |
414 | bfd_symbol_info (symbol, ret); | |
415 | } | |
416 | ||
417 | /* Make an empty symbol. */ | |
418 | ||
419 | static asymbol * | |
420 | bfd_plugin_make_empty_symbol (bfd *abfd) | |
421 | { | |
d3ce72d0 NC |
422 | asymbol *new_symbol = bfd_zalloc (abfd, sizeof (asymbol)); |
423 | if (new_symbol == NULL) | |
424 | return new_symbol; | |
425 | new_symbol->the_bfd = abfd; | |
426 | return new_symbol; | |
ce3c775b NC |
427 | } |
428 | ||
429 | static int | |
430 | bfd_plugin_sizeof_headers (bfd *a ATTRIBUTE_UNUSED, | |
431 | struct bfd_link_info *info ATTRIBUTE_UNUSED) | |
432 | { | |
433 | BFD_ASSERT (0); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | static bfd_boolean | |
438 | bfd_plugin_mkobject (bfd *abfd ATTRIBUTE_UNUSED) | |
439 | { | |
440 | BFD_ASSERT (0); | |
441 | return 0; | |
442 | } | |
443 | ||
444 | const bfd_target plugin_vec = | |
445 | { | |
446 | "plugin", /* Name. */ | |
447 | bfd_target_unknown_flavour, | |
448 | BFD_ENDIAN_LITTLE, /* Target byte order. */ | |
449 | BFD_ENDIAN_LITTLE, /* Target headers byte order. */ | |
450 | (HAS_RELOC | EXEC_P | /* Object flags. */ | |
451 | HAS_LINENO | HAS_DEBUG | | |
452 | HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED), | |
453 | (SEC_CODE | SEC_DATA | SEC_ROM | SEC_HAS_CONTENTS | |
454 | | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* Section flags. */ | |
455 | 0, /* symbol_leading_char. */ | |
456 | '/', /* ar_pad_char. */ | |
457 | 15, /* ar_max_namelen. */ | |
458 | ||
459 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, | |
460 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, | |
461 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */ | |
462 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, | |
463 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, | |
464 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */ | |
465 | ||
466 | { /* bfd_check_format. */ | |
467 | _bfd_dummy_target, | |
468 | bfd_plugin_object_p, | |
469 | bfd_generic_archive_p, | |
470 | _bfd_dummy_target | |
471 | }, | |
472 | { /* bfd_set_format. */ | |
473 | bfd_false, | |
474 | bfd_plugin_mkobject, | |
475 | _bfd_generic_mkarchive, | |
476 | bfd_false, | |
477 | }, | |
478 | { /* bfd_write_contents. */ | |
479 | bfd_false, | |
480 | bfd_false, | |
481 | _bfd_write_archive_contents, | |
482 | bfd_false, | |
483 | }, | |
484 | ||
485 | BFD_JUMP_TABLE_GENERIC (bfd_plugin), | |
486 | BFD_JUMP_TABLE_COPY (bfd_plugin), | |
487 | BFD_JUMP_TABLE_CORE (bfd_plugin), | |
488 | BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff), | |
489 | BFD_JUMP_TABLE_SYMBOLS (bfd_plugin), | |
490 | BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), | |
491 | BFD_JUMP_TABLE_WRITE (bfd_plugin), | |
492 | BFD_JUMP_TABLE_LINK (bfd_plugin), | |
493 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), | |
494 | ||
495 | NULL, | |
496 | ||
497 | NULL /* backend_data. */ | |
498 | }; | |
98950613 | 499 | #endif /* BFD_SUPPORTS_PLUGIN */ |