Commit | Line | Data |
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5d3236ee | 1 | /* Plugin control for the GNU linker. |
e922bcab | 2 | Copyright 2010, 2011 Free Software Foundation, Inc. |
5d3236ee DK |
3 | |
4 | This file is part of the GNU Binutils. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
21 | #include "sysdep.h" | |
22 | #include "libiberty.h" | |
23 | #include "bfd.h" | |
24 | #include "bfdlink.h" | |
25 | #include "bfdver.h" | |
26 | #include "ld.h" | |
27 | #include "ldmain.h" | |
28 | #include "ldmisc.h" | |
29 | #include "ldexp.h" | |
30 | #include "ldlang.h" | |
31 | #include "ldfile.h" | |
32 | #include "plugin.h" | |
33 | #include "plugin-api.h" | |
34 | #include "elf-bfd.h" | |
3917d5d5 | 35 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
f31d24a0 | 36 | #include <windows.h> |
3917d5d5 | 37 | #endif |
5d3236ee | 38 | |
1715a13c L |
39 | /* Report plugin symbols. */ |
40 | bfd_boolean report_plugin_symbols; | |
41 | ||
5d3236ee DK |
42 | /* The suffix to append to the name of the real (claimed) object file |
43 | when generating a dummy BFD to hold the IR symbols sent from the | |
cf4dc96f DK |
44 | plugin. For cosmetic use only; appears in maps, crefs etc. */ |
45 | #define IRONLY_SUFFIX " (symbol from plugin)" | |
5d3236ee DK |
46 | |
47 | /* Stores a single argument passed to a plugin. */ | |
48 | typedef struct plugin_arg | |
49 | { | |
50 | struct plugin_arg *next; | |
51 | const char *arg; | |
52 | } plugin_arg_t; | |
53 | ||
54 | /* Holds all details of a single plugin. */ | |
55 | typedef struct plugin | |
56 | { | |
57 | /* Next on the list of plugins, or NULL at end of chain. */ | |
58 | struct plugin *next; | |
59 | /* The argument string given to --plugin. */ | |
60 | const char *name; | |
61 | /* The shared library handle returned by dlopen. */ | |
62 | void *dlhandle; | |
63 | /* The list of argument string given to --plugin-opt. */ | |
64 | plugin_arg_t *args; | |
65 | /* Number of args in the list, for convenience. */ | |
66 | size_t n_args; | |
67 | /* The plugin's event handlers. */ | |
68 | ld_plugin_claim_file_handler claim_file_handler; | |
69 | ld_plugin_all_symbols_read_handler all_symbols_read_handler; | |
70 | ld_plugin_cleanup_handler cleanup_handler; | |
71 | /* TRUE if the cleanup handlers have been called. */ | |
72 | bfd_boolean cleanup_done; | |
73 | } plugin_t; | |
74 | ||
75 | /* The master list of all plugins. */ | |
76 | static plugin_t *plugins_list = NULL; | |
77 | ||
78 | /* We keep a tail pointer for easy linking on the end. */ | |
79 | static plugin_t **plugins_tail_chain_ptr = &plugins_list; | |
80 | ||
81 | /* The last plugin added to the list, for receiving args. */ | |
82 | static plugin_t *last_plugin = NULL; | |
83 | ||
84 | /* The tail of the arg chain of the last plugin added to the list. */ | |
85 | static plugin_arg_t **last_plugin_args_tail_chain_ptr = NULL; | |
86 | ||
87 | /* The plugin which is currently having a callback executed. */ | |
88 | static plugin_t *called_plugin = NULL; | |
89 | ||
90 | /* Last plugin to cause an error, if any. */ | |
91 | static const char *error_plugin = NULL; | |
92 | ||
24f58f47 | 93 | /* State of linker "notice" interface before we poked at it. */ |
9e2278f5 | 94 | static bfd_boolean orig_notice_all; |
9e2278f5 AM |
95 | |
96 | /* Original linker callbacks, and the plugin version. */ | |
97 | static const struct bfd_link_callbacks *orig_callbacks; | |
98 | static struct bfd_link_callbacks plugin_callbacks; | |
99 | ||
5d3236ee DK |
100 | /* Set at all symbols read time, to avoid recursively offering the plugin |
101 | its own newly-added input files and libs to claim. */ | |
9e2278f5 | 102 | bfd_boolean no_more_claiming = FALSE; |
5d3236ee DK |
103 | |
104 | /* List of tags to set in the constant leading part of the tv array. */ | |
105 | static const enum ld_plugin_tag tv_header_tags[] = | |
106 | { | |
107 | LDPT_MESSAGE, | |
108 | LDPT_API_VERSION, | |
109 | LDPT_GNU_LD_VERSION, | |
110 | LDPT_LINKER_OUTPUT, | |
111 | LDPT_OUTPUT_NAME, | |
112 | LDPT_REGISTER_CLAIM_FILE_HOOK, | |
113 | LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK, | |
114 | LDPT_REGISTER_CLEANUP_HOOK, | |
115 | LDPT_ADD_SYMBOLS, | |
116 | LDPT_GET_INPUT_FILE, | |
117 | LDPT_RELEASE_INPUT_FILE, | |
118 | LDPT_GET_SYMBOLS, | |
119 | LDPT_ADD_INPUT_FILE, | |
120 | LDPT_ADD_INPUT_LIBRARY, | |
121 | LDPT_SET_EXTRA_LIBRARY_PATH | |
122 | }; | |
123 | ||
124 | /* How many entries in the constant leading part of the tv array. */ | |
125 | static const size_t tv_header_size = ARRAY_SIZE (tv_header_tags); | |
126 | ||
9e2278f5 AM |
127 | /* Forward references. */ |
128 | static bfd_boolean plugin_notice (struct bfd_link_info *info, | |
35ed3f94 | 129 | struct bfd_link_hash_entry *h, bfd *abfd, |
9e2278f5 | 130 | asection *section, bfd_vma value); |
9e2278f5 | 131 | |
3917d5d5 DK |
132 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
133 | ||
134 | #define RTLD_NOW 0 /* Dummy value. */ | |
135 | ||
136 | static void * | |
137 | dlopen (const char *file, int mode ATTRIBUTE_UNUSED) | |
138 | { | |
139 | return LoadLibrary (file); | |
140 | } | |
141 | ||
142 | static void * | |
143 | dlsym (void *handle, const char *name) | |
144 | { | |
145 | return GetProcAddress (handle, name); | |
146 | } | |
147 | ||
148 | static int | |
149 | dlclose (void *handle) | |
150 | { | |
151 | FreeLibrary (handle); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */ | |
156 | ||
5d3236ee DK |
157 | /* Helper function for exiting with error status. */ |
158 | static int | |
159 | set_plugin_error (const char *plugin) | |
160 | { | |
161 | error_plugin = plugin; | |
162 | return -1; | |
163 | } | |
164 | ||
165 | /* Test if an error occurred. */ | |
166 | static bfd_boolean | |
167 | plugin_error_p (void) | |
168 | { | |
169 | return error_plugin != NULL; | |
170 | } | |
171 | ||
172 | /* Return name of plugin which caused an error if any. */ | |
d44ad554 DK |
173 | const char * |
174 | plugin_error_plugin (void) | |
5d3236ee DK |
175 | { |
176 | return error_plugin ? error_plugin : _("<no plugin>"); | |
177 | } | |
178 | ||
179 | /* Handle -plugin arg: find and load plugin, or return error. */ | |
d44ad554 DK |
180 | int |
181 | plugin_opt_plugin (const char *plugin) | |
5d3236ee DK |
182 | { |
183 | plugin_t *newplug; | |
184 | ||
185 | newplug = xmalloc (sizeof *newplug); | |
186 | memset (newplug, 0, sizeof *newplug); | |
187 | newplug->name = plugin; | |
188 | newplug->dlhandle = dlopen (plugin, RTLD_NOW); | |
189 | if (!newplug->dlhandle) | |
190 | return set_plugin_error (plugin); | |
191 | ||
192 | /* Chain on end, so when we run list it is in command-line order. */ | |
193 | *plugins_tail_chain_ptr = newplug; | |
194 | plugins_tail_chain_ptr = &newplug->next; | |
195 | ||
196 | /* Record it as current plugin for receiving args. */ | |
197 | last_plugin = newplug; | |
198 | last_plugin_args_tail_chain_ptr = &newplug->args; | |
199 | return 0; | |
200 | } | |
201 | ||
202 | /* Accumulate option arguments for last-loaded plugin, or return | |
203 | error if none. */ | |
d44ad554 DK |
204 | int |
205 | plugin_opt_plugin_arg (const char *arg) | |
5d3236ee DK |
206 | { |
207 | plugin_arg_t *newarg; | |
208 | ||
209 | if (!last_plugin) | |
210 | return set_plugin_error (_("<no plugin>")); | |
211 | ||
212 | newarg = xmalloc (sizeof *newarg); | |
213 | newarg->arg = arg; | |
214 | newarg->next = NULL; | |
215 | ||
216 | /* Chain on end to preserve command-line order. */ | |
217 | *last_plugin_args_tail_chain_ptr = newarg; | |
218 | last_plugin_args_tail_chain_ptr = &newarg->next; | |
219 | last_plugin->n_args++; | |
220 | return 0; | |
221 | } | |
222 | ||
223 | /* Create a dummy BFD. */ | |
224 | bfd * | |
225 | plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate) | |
226 | { | |
bc110b6e AM |
227 | bfd *abfd; |
228 | ||
229 | bfd_use_reserved_id = 1; | |
9e2278f5 | 230 | abfd = bfd_create (concat (name, IRONLY_SUFFIX, (const char *) NULL), |
bc110b6e | 231 | srctemplate); |
9e2278f5 AM |
232 | if (abfd != NULL) |
233 | { | |
234 | abfd->flags |= BFD_LINKER_CREATED | BFD_PLUGIN; | |
235 | bfd_set_arch_info (abfd, bfd_get_arch_info (srctemplate)); | |
236 | bfd_set_gp_size (abfd, bfd_get_gp_size (srctemplate)); | |
237 | if (bfd_make_writable (abfd) | |
238 | && bfd_copy_private_bfd_data (srctemplate, abfd)) | |
239 | { | |
240 | flagword flags; | |
241 | ||
242 | /* Create sections to own the symbols. */ | |
243 | flags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY | |
244 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE); | |
245 | if (bfd_make_section_anyway_with_flags (abfd, ".text", flags)) | |
246 | return abfd; | |
247 | } | |
248 | } | |
249 | einfo (_("could not create dummy IR bfd: %F%E\n")); | |
250 | return NULL; | |
5d3236ee DK |
251 | } |
252 | ||
d44ad554 DK |
253 | /* Check if the BFD passed in is an IR dummy object file. */ |
254 | static bfd_boolean | |
5d3236ee DK |
255 | is_ir_dummy_bfd (const bfd *abfd) |
256 | { | |
cf4dc96f DK |
257 | /* ABFD can sometimes legitimately be NULL, e.g. when called from one |
258 | of the linker callbacks for a symbol in the *ABS* or *UND* sections. | |
259 | Likewise, the usrdata field may be NULL if ABFD was added by the | |
260 | backend without a corresponding input statement, as happens e.g. | |
261 | when processing DT_NEEDED dependencies. */ | |
9e2278f5 AM |
262 | return (abfd |
263 | && abfd->usrdata | |
264 | && ((lang_input_statement_type *)(abfd->usrdata))->claimed); | |
5d3236ee DK |
265 | } |
266 | ||
267 | /* Helpers to convert between BFD and GOLD symbol formats. */ | |
268 | static enum ld_plugin_status | |
269 | asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, | |
f84854b6 | 270 | const struct ld_plugin_symbol *ldsym) |
5d3236ee DK |
271 | { |
272 | flagword flags = BSF_NO_FLAGS; | |
273 | struct bfd_section *section; | |
274 | ||
275 | asym->the_bfd = abfd; | |
f84854b6 | 276 | asym->name = (ldsym->version |
9e2278f5 | 277 | ? concat (ldsym->name, "@", ldsym->version, (const char *) NULL) |
f84854b6 | 278 | : ldsym->name); |
5d3236ee DK |
279 | asym->value = 0; |
280 | switch (ldsym->def) | |
281 | { | |
282 | case LDPK_WEAKDEF: | |
283 | flags = BSF_WEAK; | |
284 | /* FALLTHRU */ | |
285 | case LDPK_DEF: | |
286 | flags |= BSF_GLOBAL; | |
287 | section = bfd_get_section_by_name (abfd, ".text"); | |
288 | break; | |
289 | ||
290 | case LDPK_WEAKUNDEF: | |
291 | flags = BSF_WEAK; | |
292 | /* FALLTHRU */ | |
293 | case LDPK_UNDEF: | |
294 | section = bfd_und_section_ptr; | |
295 | break; | |
296 | ||
297 | case LDPK_COMMON: | |
298 | flags = BSF_GLOBAL; | |
299 | section = bfd_com_section_ptr; | |
300 | asym->value = ldsym->size; | |
5c08b7d4 L |
301 | /* For ELF targets, set alignment of common symbol to 1. */ |
302 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
02d00247 AM |
303 | { |
304 | ((elf_symbol_type *) asym)->internal_elf_sym.st_shndx = SHN_COMMON; | |
305 | ((elf_symbol_type *) asym)->internal_elf_sym.st_value = 1; | |
306 | } | |
5d3236ee DK |
307 | break; |
308 | ||
309 | default: | |
310 | return LDPS_ERR; | |
311 | } | |
312 | asym->flags = flags; | |
313 | asym->section = section; | |
314 | ||
315 | /* Visibility only applies on ELF targets. */ | |
316 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
317 | { | |
318 | elf_symbol_type *elfsym = elf_symbol_from (abfd, asym); | |
cfac8028 L |
319 | unsigned char visibility; |
320 | ||
5d3236ee | 321 | if (!elfsym) |
ea360572 | 322 | einfo (_("%P%F: %s: non-ELF symbol in ELF BFD!\n"), asym->name); |
cfac8028 L |
323 | switch (ldsym->visibility) |
324 | { | |
325 | default: | |
ea360572 | 326 | einfo (_("%P%F: unknown ELF symbol visibility: %d!\n"), |
cfac8028 L |
327 | ldsym->visibility); |
328 | case LDPV_DEFAULT: | |
329 | visibility = STV_DEFAULT; | |
330 | break; | |
331 | case LDPV_PROTECTED: | |
332 | visibility = STV_PROTECTED; | |
333 | break; | |
334 | case LDPV_INTERNAL: | |
335 | visibility = STV_INTERNAL; | |
336 | break; | |
337 | case LDPV_HIDDEN: | |
338 | visibility = STV_HIDDEN; | |
339 | break; | |
340 | } | |
341 | elfsym->internal_elf_sym.st_other | |
342 | = (visibility | (elfsym->internal_elf_sym.st_other | |
343 | & ~ELF_ST_VISIBILITY (-1))); | |
5d3236ee DK |
344 | } |
345 | ||
346 | return LDPS_OK; | |
347 | } | |
348 | ||
349 | /* Register a claim-file handler. */ | |
350 | static enum ld_plugin_status | |
351 | register_claim_file (ld_plugin_claim_file_handler handler) | |
352 | { | |
353 | ASSERT (called_plugin); | |
354 | called_plugin->claim_file_handler = handler; | |
355 | return LDPS_OK; | |
356 | } | |
357 | ||
358 | /* Register an all-symbols-read handler. */ | |
359 | static enum ld_plugin_status | |
360 | register_all_symbols_read (ld_plugin_all_symbols_read_handler handler) | |
361 | { | |
362 | ASSERT (called_plugin); | |
363 | called_plugin->all_symbols_read_handler = handler; | |
364 | return LDPS_OK; | |
365 | } | |
366 | ||
367 | /* Register a cleanup handler. */ | |
368 | static enum ld_plugin_status | |
369 | register_cleanup (ld_plugin_cleanup_handler handler) | |
370 | { | |
371 | ASSERT (called_plugin); | |
372 | called_plugin->cleanup_handler = handler; | |
373 | return LDPS_OK; | |
374 | } | |
375 | ||
376 | /* Add symbols from a plugin-claimed input file. */ | |
377 | static enum ld_plugin_status | |
378 | add_symbols (void *handle, int nsyms, const struct ld_plugin_symbol *syms) | |
379 | { | |
380 | asymbol **symptrs; | |
381 | bfd *abfd = handle; | |
382 | int n; | |
383 | ASSERT (called_plugin); | |
384 | symptrs = xmalloc (nsyms * sizeof *symptrs); | |
385 | for (n = 0; n < nsyms; n++) | |
386 | { | |
387 | enum ld_plugin_status rv; | |
388 | asymbol *bfdsym = bfd_make_empty_symbol (abfd); | |
389 | symptrs[n] = bfdsym; | |
390 | rv = asymbol_from_plugin_symbol (abfd, bfdsym, syms + n); | |
391 | if (rv != LDPS_OK) | |
392 | return rv; | |
393 | } | |
394 | bfd_set_symtab (abfd, symptrs, nsyms); | |
395 | return LDPS_OK; | |
396 | } | |
397 | ||
398 | /* Get the input file information with an open (possibly re-opened) | |
399 | file descriptor. */ | |
400 | static enum ld_plugin_status | |
401 | get_input_file (const void *handle, struct ld_plugin_input_file *file) | |
402 | { | |
403 | ASSERT (called_plugin); | |
404 | handle = handle; | |
405 | file = file; | |
406 | return LDPS_ERR; | |
407 | } | |
408 | ||
409 | /* Release the input file. */ | |
410 | static enum ld_plugin_status | |
411 | release_input_file (const void *handle) | |
412 | { | |
413 | ASSERT (called_plugin); | |
414 | handle = handle; | |
415 | return LDPS_ERR; | |
416 | } | |
417 | ||
42a851a9 DK |
418 | /* Return TRUE if a defined symbol might be reachable from outside the |
419 | universe of claimed objects. */ | |
420 | static inline bfd_boolean | |
421 | is_visible_from_outside (struct ld_plugin_symbol *lsym, asection *section, | |
f84854b6 | 422 | struct bfd_link_hash_entry *blhe) |
42a851a9 | 423 | { |
35ed3f94 AM |
424 | struct bfd_sym_chain *sym; |
425 | ||
42a851a9 DK |
426 | /* Section's owner may be NULL if it is the absolute |
427 | section, fortunately is_ir_dummy_bfd handles that. */ | |
428 | if (!is_ir_dummy_bfd (section->owner)) | |
429 | return TRUE; | |
430 | if (link_info.relocatable) | |
431 | return TRUE; | |
432 | if (link_info.export_dynamic || link_info.shared) | |
433 | { | |
434 | /* Only ELF symbols really have visibility. */ | |
435 | if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour) | |
436 | { | |
437 | struct elf_link_hash_entry *el = (struct elf_link_hash_entry *)blhe; | |
438 | int vis = ELF_ST_VISIBILITY (el->other); | |
439 | return vis == STV_DEFAULT || vis == STV_PROTECTED; | |
440 | } | |
441 | /* On non-ELF targets, we can safely make inferences by considering | |
f84854b6 | 442 | what visibility the plugin would have liked to apply when it first |
42a851a9 DK |
443 | sent us the symbol. During ELF symbol processing, visibility only |
444 | ever becomes more restrictive, not less, when symbols are merged, | |
445 | so this is a conservative estimate; it may give false positives, | |
446 | declaring something visible from outside when it in fact would | |
447 | not have been, but this will only lead to missed optimisation | |
448 | opportunities during LTRANS at worst; it will not give false | |
449 | negatives, which can lead to the disastrous conclusion that the | |
450 | related symbol is IRONLY. (See GCC PR46319 for an example.) */ | |
cfac8028 L |
451 | return (lsym->visibility == LDPV_DEFAULT |
452 | || lsym->visibility == LDPV_PROTECTED); | |
42a851a9 | 453 | } |
35ed3f94 AM |
454 | |
455 | for (sym = &entry_symbol; sym != NULL; sym = sym->next) | |
456 | if (sym->name | |
457 | && strcmp (sym->name, blhe->root.string) == 0) | |
458 | return TRUE; | |
459 | ||
42a851a9 DK |
460 | return FALSE; |
461 | } | |
462 | ||
5d3236ee DK |
463 | /* Get the symbol resolution info for a plugin-claimed input file. */ |
464 | static enum ld_plugin_status | |
465 | get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
466 | { | |
467 | const bfd *abfd = handle; | |
468 | int n; | |
469 | ASSERT (called_plugin); | |
470 | for (n = 0; n < nsyms; n++) | |
471 | { | |
472 | struct bfd_link_hash_entry *blhe; | |
473 | bfd_boolean ironly; | |
42a851a9 | 474 | asection *owner_sec; |
10be1b6a DK |
475 | if (syms[n].def != LDPK_UNDEF) |
476 | blhe = bfd_link_hash_lookup (link_info.hash, syms[n].name, | |
477 | FALSE, FALSE, TRUE); | |
478 | else | |
479 | blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, &link_info, | |
480 | syms[n].name, FALSE, FALSE, TRUE); | |
5d3236ee DK |
481 | if (!blhe) |
482 | { | |
483 | syms[n].resolution = LDPR_UNKNOWN; | |
1715a13c | 484 | goto report_symbol; |
5d3236ee DK |
485 | } |
486 | ||
487 | /* Determine resolution from blhe type and symbol's original type. */ | |
488 | if (blhe->type == bfd_link_hash_undefined | |
f84854b6 | 489 | || blhe->type == bfd_link_hash_undefweak) |
5d3236ee DK |
490 | { |
491 | syms[n].resolution = LDPR_UNDEF; | |
1715a13c | 492 | goto report_symbol; |
5d3236ee DK |
493 | } |
494 | if (blhe->type != bfd_link_hash_defined | |
f84854b6 L |
495 | && blhe->type != bfd_link_hash_defweak |
496 | && blhe->type != bfd_link_hash_common) | |
5d3236ee DK |
497 | { |
498 | /* We should not have a new, indirect or warning symbol here. */ | |
ea360572 | 499 | einfo ("%P%F: %s: plugin symbol table corrupt (sym type %d)\n", |
f84854b6 | 500 | called_plugin->name, blhe->type); |
5d3236ee DK |
501 | } |
502 | ||
42a851a9 DK |
503 | /* Find out which section owns the symbol. Since it's not undef, |
504 | it must have an owner; if it's not a common symbol, both defs | |
505 | and weakdefs keep it in the same place. */ | |
9e2278f5 AM |
506 | owner_sec = (blhe->type == bfd_link_hash_common |
507 | ? blhe->u.c.p->section | |
508 | : blhe->u.def.section); | |
42a851a9 DK |
509 | |
510 | /* We need to know if the sym is referenced from non-IR files. Or | |
f84854b6 | 511 | even potentially-referenced, perhaps in a future final link if |
42a851a9 DK |
512 | this is a partial one, perhaps dynamically at load-time if the |
513 | symbol is externally visible. */ | |
35ed3f94 AM |
514 | ironly = !(blhe->non_ir_ref |
515 | || is_visible_from_outside (&syms[n], owner_sec, blhe)); | |
5d3236ee DK |
516 | |
517 | /* If it was originally undefined or common, then it has been | |
f84854b6 L |
518 | resolved; determine how. */ |
519 | if (syms[n].def == LDPK_UNDEF | |
520 | || syms[n].def == LDPK_WEAKUNDEF | |
5d3236ee DK |
521 | || syms[n].def == LDPK_COMMON) |
522 | { | |
5d3236ee DK |
523 | if (owner_sec->owner == link_info.output_bfd) |
524 | syms[n].resolution = LDPR_RESOLVED_EXEC; | |
525 | else if (owner_sec->owner == abfd) | |
f84854b6 L |
526 | syms[n].resolution = (ironly |
527 | ? LDPR_PREVAILING_DEF_IRONLY | |
528 | : LDPR_PREVAILING_DEF); | |
5d3236ee DK |
529 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
530 | syms[n].resolution = LDPR_RESOLVED_IR; | |
cc322803 L |
531 | else if (owner_sec->owner != NULL |
532 | && (owner_sec->owner->flags & DYNAMIC) != 0) | |
5d3236ee DK |
533 | syms[n].resolution = LDPR_RESOLVED_DYN; |
534 | else | |
535 | syms[n].resolution = LDPR_RESOLVED_EXEC; | |
1715a13c | 536 | goto report_symbol; |
5d3236ee DK |
537 | } |
538 | ||
539 | /* Was originally def, or weakdef. Does it prevail? If the | |
f84854b6 | 540 | owner is the original dummy bfd that supplied it, then this |
5d3236ee | 541 | is the definition that has prevailed. */ |
42a851a9 | 542 | if (owner_sec->owner == link_info.output_bfd) |
5d3236ee | 543 | syms[n].resolution = LDPR_PREEMPTED_REG; |
42a851a9 | 544 | else if (owner_sec->owner == abfd) |
5d3236ee | 545 | { |
f84854b6 | 546 | syms[n].resolution = (ironly |
5d3236ee | 547 | ? LDPR_PREVAILING_DEF_IRONLY |
f84854b6 | 548 | : LDPR_PREVAILING_DEF); |
1715a13c | 549 | goto report_symbol; |
5d3236ee DK |
550 | } |
551 | ||
552 | /* Was originally def, weakdef, or common, but has been pre-empted. */ | |
1715a13c L |
553 | syms[n].resolution = (is_ir_dummy_bfd (owner_sec->owner) |
554 | ? LDPR_PREEMPTED_IR | |
555 | : LDPR_PREEMPTED_REG); | |
556 | ||
9e2278f5 | 557 | report_symbol: |
1715a13c | 558 | if (report_plugin_symbols) |
9e2278f5 AM |
559 | einfo (_("%P: %B: symbol `%s' " |
560 | "definition: %d, visibility: %d, resolution: %d\n"), | |
561 | abfd, syms[n].name, | |
562 | syms[n].def, syms[n].visibility, syms[n].resolution); | |
5d3236ee DK |
563 | } |
564 | return LDPS_OK; | |
565 | } | |
566 | ||
567 | /* Add a new (real) input file generated by a plugin. */ | |
568 | static enum ld_plugin_status | |
569 | add_input_file (const char *pathname) | |
570 | { | |
571 | ASSERT (called_plugin); | |
d4cb7acd | 572 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_file_enum, |
f84854b6 | 573 | NULL)) |
5d3236ee DK |
574 | return LDPS_ERR; |
575 | return LDPS_OK; | |
576 | } | |
577 | ||
578 | /* Add a new (real) library required by a plugin. */ | |
579 | static enum ld_plugin_status | |
580 | add_input_library (const char *pathname) | |
581 | { | |
582 | ASSERT (called_plugin); | |
d4cb7acd | 583 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_l_enum, |
f84854b6 | 584 | NULL)) |
5d3236ee DK |
585 | return LDPS_ERR; |
586 | return LDPS_OK; | |
587 | } | |
588 | ||
589 | /* Set the extra library path to be used by libraries added via | |
590 | add_input_library. */ | |
591 | static enum ld_plugin_status | |
592 | set_extra_library_path (const char *path) | |
593 | { | |
594 | ASSERT (called_plugin); | |
d4cb7acd | 595 | ldfile_add_library_path (xstrdup (path), FALSE); |
5d3236ee DK |
596 | return LDPS_OK; |
597 | } | |
598 | ||
599 | /* Issue a diagnostic message from a plugin. */ | |
600 | static enum ld_plugin_status | |
601 | message (int level, const char *format, ...) | |
602 | { | |
603 | va_list args; | |
604 | va_start (args, format); | |
605 | ||
606 | switch (level) | |
607 | { | |
608 | case LDPL_INFO: | |
609 | vfinfo (stdout, format, args, FALSE); | |
d251c5c4 | 610 | putchar ('\n'); |
5d3236ee DK |
611 | break; |
612 | case LDPL_WARNING: | |
613 | vfinfo (stdout, format, args, TRUE); | |
d251c5c4 | 614 | putchar ('\n'); |
5d3236ee DK |
615 | break; |
616 | case LDPL_FATAL: | |
617 | case LDPL_ERROR: | |
618 | default: | |
9e2278f5 AM |
619 | { |
620 | char *newfmt = ACONCAT ((level == LDPL_FATAL ? "%P%F: " : "%P%X: ", | |
621 | format, "\n", (const char *) NULL)); | |
622 | fflush (stdout); | |
623 | vfinfo (stderr, newfmt, args, TRUE); | |
624 | fflush (stderr); | |
625 | } | |
5d3236ee DK |
626 | break; |
627 | } | |
628 | ||
629 | va_end (args); | |
630 | return LDPS_OK; | |
631 | } | |
632 | ||
633 | /* Helper to size leading part of tv array and set it up. */ | |
634 | static size_t | |
635 | set_tv_header (struct ld_plugin_tv *tv) | |
636 | { | |
637 | size_t i; | |
638 | ||
639 | /* Version info. */ | |
640 | static const unsigned int major = (unsigned)(BFD_VERSION / 100000000UL); | |
641 | static const unsigned int minor = (unsigned)(BFD_VERSION / 1000000UL) % 100; | |
642 | ||
643 | if (!tv) | |
644 | return tv_header_size; | |
645 | ||
646 | for (i = 0; i < tv_header_size; i++) | |
647 | { | |
648 | tv[i].tv_tag = tv_header_tags[i]; | |
649 | #define TVU(x) tv[i].tv_u.tv_ ## x | |
650 | switch (tv[i].tv_tag) | |
651 | { | |
f84854b6 L |
652 | case LDPT_MESSAGE: |
653 | TVU(message) = message; | |
654 | break; | |
655 | case LDPT_API_VERSION: | |
656 | TVU(val) = LD_PLUGIN_API_VERSION; | |
657 | break; | |
658 | case LDPT_GNU_LD_VERSION: | |
659 | TVU(val) = major * 100 + minor; | |
660 | break; | |
661 | case LDPT_LINKER_OUTPUT: | |
662 | TVU(val) = (link_info.relocatable | |
663 | ? LDPO_REL | |
664 | : (link_info.shared ? LDPO_DYN : LDPO_EXEC)); | |
665 | break; | |
666 | case LDPT_OUTPUT_NAME: | |
667 | TVU(string) = output_filename; | |
668 | break; | |
669 | case LDPT_REGISTER_CLAIM_FILE_HOOK: | |
670 | TVU(register_claim_file) = register_claim_file; | |
671 | break; | |
672 | case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: | |
673 | TVU(register_all_symbols_read) = register_all_symbols_read; | |
674 | break; | |
675 | case LDPT_REGISTER_CLEANUP_HOOK: | |
676 | TVU(register_cleanup) = register_cleanup; | |
677 | break; | |
678 | case LDPT_ADD_SYMBOLS: | |
679 | TVU(add_symbols) = add_symbols; | |
680 | break; | |
681 | case LDPT_GET_INPUT_FILE: | |
682 | TVU(get_input_file) = get_input_file; | |
683 | break; | |
684 | case LDPT_RELEASE_INPUT_FILE: | |
685 | TVU(release_input_file) = release_input_file; | |
686 | break; | |
687 | case LDPT_GET_SYMBOLS: | |
688 | TVU(get_symbols) = get_symbols; | |
689 | break; | |
690 | case LDPT_ADD_INPUT_FILE: | |
691 | TVU(add_input_file) = add_input_file; | |
692 | break; | |
693 | case LDPT_ADD_INPUT_LIBRARY: | |
694 | TVU(add_input_library) = add_input_library; | |
695 | break; | |
696 | case LDPT_SET_EXTRA_LIBRARY_PATH: | |
697 | TVU(set_extra_library_path) = set_extra_library_path; | |
698 | break; | |
699 | default: | |
700 | /* Added a new entry to the array without adding | |
701 | a new case to set up its value is a bug. */ | |
702 | FAIL (); | |
5d3236ee DK |
703 | } |
704 | #undef TVU | |
705 | } | |
706 | return tv_header_size; | |
707 | } | |
708 | ||
709 | /* Append the per-plugin args list and trailing LDPT_NULL to tv. */ | |
710 | static void | |
711 | set_tv_plugin_args (plugin_t *plugin, struct ld_plugin_tv *tv) | |
712 | { | |
713 | plugin_arg_t *arg = plugin->args; | |
714 | while (arg) | |
715 | { | |
716 | tv->tv_tag = LDPT_OPTION; | |
717 | tv->tv_u.tv_string = arg->arg; | |
718 | arg = arg->next; | |
719 | tv++; | |
720 | } | |
721 | tv->tv_tag = LDPT_NULL; | |
722 | tv->tv_u.tv_val = 0; | |
723 | } | |
724 | ||
d44ad554 DK |
725 | /* Return true if any plugins are active this run. Only valid |
726 | after options have been processed. */ | |
727 | bfd_boolean | |
728 | plugin_active_plugins_p (void) | |
729 | { | |
730 | return plugins_list != NULL; | |
731 | } | |
732 | ||
5d3236ee | 733 | /* Load up and initialise all plugins after argument parsing. */ |
d44ad554 DK |
734 | int |
735 | plugin_load_plugins (void) | |
5d3236ee DK |
736 | { |
737 | struct ld_plugin_tv *my_tv; | |
738 | unsigned int max_args = 0; | |
739 | plugin_t *curplug = plugins_list; | |
740 | ||
741 | /* If there are no plugins, we need do nothing this run. */ | |
742 | if (!curplug) | |
743 | return 0; | |
744 | ||
745 | /* First pass over plugins to find max # args needed so that we | |
746 | can size and allocate the tv array. */ | |
747 | while (curplug) | |
748 | { | |
749 | if (curplug->n_args > max_args) | |
750 | max_args = curplug->n_args; | |
751 | curplug = curplug->next; | |
752 | } | |
753 | ||
754 | /* Allocate tv array and initialise constant part. */ | |
755 | my_tv = xmalloc ((max_args + 1 + tv_header_size) * sizeof *my_tv); | |
756 | set_tv_header (my_tv); | |
757 | ||
758 | /* Pass over plugins again, activating them. */ | |
759 | curplug = plugins_list; | |
760 | while (curplug) | |
761 | { | |
762 | enum ld_plugin_status rv; | |
763 | ld_plugin_onload onloadfn = dlsym (curplug->dlhandle, "onload"); | |
764 | if (!onloadfn) | |
765 | onloadfn = dlsym (curplug->dlhandle, "_onload"); | |
766 | if (!onloadfn) | |
f84854b6 | 767 | return set_plugin_error (curplug->name); |
5d3236ee DK |
768 | set_tv_plugin_args (curplug, &my_tv[tv_header_size]); |
769 | called_plugin = curplug; | |
770 | rv = (*onloadfn) (my_tv); | |
771 | called_plugin = NULL; | |
772 | if (rv != LDPS_OK) | |
f84854b6 | 773 | return set_plugin_error (curplug->name); |
5d3236ee DK |
774 | curplug = curplug->next; |
775 | } | |
776 | ||
777 | /* Since plugin(s) inited ok, assume they're going to want symbol | |
778 | resolutions, which needs us to track which symbols are referenced | |
779 | by non-IR files using the linker's notice callback. */ | |
9e2278f5 AM |
780 | orig_notice_all = link_info.notice_all; |
781 | orig_callbacks = link_info.callbacks; | |
782 | plugin_callbacks = *orig_callbacks; | |
783 | plugin_callbacks.notice = &plugin_notice; | |
5d3236ee | 784 | link_info.notice_all = TRUE; |
9e2278f5 | 785 | link_info.callbacks = &plugin_callbacks; |
5d3236ee DK |
786 | |
787 | return 0; | |
788 | } | |
789 | ||
790 | /* Call 'claim file' hook for all plugins. */ | |
02d00247 | 791 | static int |
5d3236ee DK |
792 | plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed) |
793 | { | |
794 | plugin_t *curplug = plugins_list; | |
795 | *claimed = FALSE; | |
796 | if (no_more_claiming) | |
797 | return 0; | |
798 | while (curplug && !*claimed) | |
799 | { | |
800 | if (curplug->claim_file_handler) | |
801 | { | |
802 | enum ld_plugin_status rv; | |
803 | called_plugin = curplug; | |
804 | rv = (*curplug->claim_file_handler) (file, claimed); | |
805 | called_plugin = NULL; | |
806 | if (rv != LDPS_OK) | |
807 | set_plugin_error (curplug->name); | |
808 | } | |
809 | curplug = curplug->next; | |
810 | } | |
811 | return plugin_error_p () ? -1 : 0; | |
812 | } | |
813 | ||
02d00247 AM |
814 | void |
815 | plugin_maybe_claim (struct ld_plugin_input_file *file, | |
816 | lang_input_statement_type *entry) | |
817 | { | |
818 | int claimed = 0; | |
819 | ||
820 | /* We create a dummy BFD, initially empty, to house whatever symbols | |
821 | the plugin may want to add. */ | |
822 | file->handle = plugin_get_ir_dummy_bfd (entry->the_bfd->filename, | |
823 | entry->the_bfd); | |
824 | if (plugin_call_claim_file (file, &claimed)) | |
825 | einfo (_("%P%F: %s: plugin reported error claiming file\n"), | |
826 | plugin_error_plugin ()); | |
827 | /* fd belongs to us, not the plugin; but we don't need it. */ | |
828 | close (file->fd); | |
829 | if (claimed) | |
830 | { | |
831 | /* Discard the real file's BFD and substitute the dummy one. */ | |
832 | ||
833 | /* BFD archive handling caches elements so we can't call | |
834 | bfd_close for archives. */ | |
835 | if (entry->the_bfd->my_archive == NULL) | |
836 | bfd_close (entry->the_bfd); | |
837 | entry->the_bfd = file->handle; | |
838 | entry->claimed = TRUE; | |
839 | bfd_make_readable (entry->the_bfd); | |
840 | } | |
841 | else | |
842 | { | |
843 | /* If plugin didn't claim the file, we don't need the dummy bfd. | |
844 | Can't avoid speculatively creating it, alas. */ | |
845 | bfd_close_all_done (file->handle); | |
846 | entry->claimed = FALSE; | |
847 | } | |
848 | } | |
849 | ||
5d3236ee DK |
850 | /* Call 'all symbols read' hook for all plugins. */ |
851 | int | |
852 | plugin_call_all_symbols_read (void) | |
853 | { | |
854 | plugin_t *curplug = plugins_list; | |
855 | ||
856 | /* Disable any further file-claiming. */ | |
857 | no_more_claiming = TRUE; | |
858 | ||
5d3236ee DK |
859 | while (curplug) |
860 | { | |
861 | if (curplug->all_symbols_read_handler) | |
862 | { | |
863 | enum ld_plugin_status rv; | |
864 | called_plugin = curplug; | |
865 | rv = (*curplug->all_symbols_read_handler) (); | |
866 | called_plugin = NULL; | |
867 | if (rv != LDPS_OK) | |
868 | set_plugin_error (curplug->name); | |
869 | } | |
870 | curplug = curplug->next; | |
871 | } | |
872 | return plugin_error_p () ? -1 : 0; | |
873 | } | |
874 | ||
e73d965c | 875 | /* Call 'cleanup' hook for all plugins at exit. */ |
498cd2a0 | 876 | void |
5d3236ee DK |
877 | plugin_call_cleanup (void) |
878 | { | |
879 | plugin_t *curplug = plugins_list; | |
880 | while (curplug) | |
881 | { | |
882 | if (curplug->cleanup_handler && !curplug->cleanup_done) | |
883 | { | |
884 | enum ld_plugin_status rv; | |
885 | curplug->cleanup_done = TRUE; | |
886 | called_plugin = curplug; | |
887 | rv = (*curplug->cleanup_handler) (); | |
888 | called_plugin = NULL; | |
889 | if (rv != LDPS_OK) | |
890 | set_plugin_error (curplug->name); | |
891 | dlclose (curplug->dlhandle); | |
892 | } | |
893 | curplug = curplug->next; | |
894 | } | |
e73d965c L |
895 | if (plugin_error_p ()) |
896 | info_msg (_("%P: %s: error in plugin cleanup (ignored)\n"), | |
897 | plugin_error_plugin ()); | |
5d3236ee DK |
898 | } |
899 | ||
5d3236ee DK |
900 | /* To determine which symbols should be resolved LDPR_PREVAILING_DEF |
901 | and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as | |
35ed3f94 AM |
902 | the linker adds them to the linker hash table. Mark those |
903 | referenced from a non-IR file with non_ir_ref. We have to | |
904 | notice_all symbols, because we won't necessarily know until later | |
905 | which ones will be contributed by IR files. */ | |
9e2278f5 AM |
906 | static bfd_boolean |
907 | plugin_notice (struct bfd_link_info *info, | |
35ed3f94 | 908 | struct bfd_link_hash_entry *h, |
9e2278f5 AM |
909 | bfd *abfd, |
910 | asection *section, | |
911 | bfd_vma value) | |
5d3236ee | 912 | { |
35ed3f94 | 913 | if (h != NULL) |
5d3236ee | 914 | { |
9e2278f5 AM |
915 | /* No further processing if this def/ref is from an IR dummy BFD. */ |
916 | if (is_ir_dummy_bfd (abfd)) | |
917 | return TRUE; | |
918 | ||
35ed3f94 | 919 | /* If this is a ref, set non_ir_ref. */ |
9e2278f5 | 920 | if (bfd_is_und_section (section)) |
35ed3f94 AM |
921 | h->non_ir_ref = TRUE; |
922 | ||
923 | /* Otherwise, it must be a new def. Ensure any symbol defined | |
924 | in an IR dummy BFD takes on a new value from a real BFD. | |
925 | Weak symbols are not normally overridden by a new weak | |
926 | definition, and strong symbols will normally cause multiple | |
927 | definition errors. Avoid this by making the symbol appear | |
928 | to be undefined. */ | |
929 | else if (((h->type == bfd_link_hash_defweak | |
930 | || h->type == bfd_link_hash_defined) | |
931 | && is_ir_dummy_bfd (h->u.def.section->owner)) | |
932 | || (h->type == bfd_link_hash_common | |
933 | && is_ir_dummy_bfd (h->u.c.p->section->owner))) | |
934 | h->type = bfd_link_hash_undefweak; | |
5d3236ee DK |
935 | } |
936 | ||
937 | /* Continue with cref/nocrossref/trace-sym processing. */ | |
35ed3f94 | 938 | if (h == NULL |
9e2278f5 AM |
939 | || orig_notice_all |
940 | || (info->notice_hash != NULL | |
35ed3f94 AM |
941 | && bfd_hash_lookup (info->notice_hash, h->root.string, |
942 | FALSE, FALSE) != NULL)) | |
943 | return (*orig_callbacks->notice) (info, h, abfd, section, value); | |
5d3236ee DK |
944 | return TRUE; |
945 | } |