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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 | ||
93 | /* A hash table that records symbols referenced by non-IR files. Used | |
94 | at get_symbols time to determine whether any prevailing defs from | |
95 | IR files are referenced only from other IR files, so tthat we can | |
96 | we can distinguish the LDPR_PREVAILING_DEF and LDPR_PREVAILING_DEF_IRONLY | |
97 | cases when establishing symbol resolutions. */ | |
98 | static struct bfd_hash_table *non_ironly_hash = NULL; | |
99 | ||
24f58f47 | 100 | /* State of linker "notice" interface before we poked at it. */ |
9e2278f5 | 101 | static bfd_boolean orig_notice_all; |
9e2278f5 AM |
102 | |
103 | /* Original linker callbacks, and the plugin version. */ | |
104 | static const struct bfd_link_callbacks *orig_callbacks; | |
105 | static struct bfd_link_callbacks plugin_callbacks; | |
106 | ||
5d3236ee DK |
107 | /* Set at all symbols read time, to avoid recursively offering the plugin |
108 | its own newly-added input files and libs to claim. */ | |
9e2278f5 | 109 | bfd_boolean no_more_claiming = FALSE; |
5d3236ee DK |
110 | |
111 | /* List of tags to set in the constant leading part of the tv array. */ | |
112 | static const enum ld_plugin_tag tv_header_tags[] = | |
113 | { | |
114 | LDPT_MESSAGE, | |
115 | LDPT_API_VERSION, | |
116 | LDPT_GNU_LD_VERSION, | |
117 | LDPT_LINKER_OUTPUT, | |
118 | LDPT_OUTPUT_NAME, | |
119 | LDPT_REGISTER_CLAIM_FILE_HOOK, | |
120 | LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK, | |
121 | LDPT_REGISTER_CLEANUP_HOOK, | |
122 | LDPT_ADD_SYMBOLS, | |
123 | LDPT_GET_INPUT_FILE, | |
124 | LDPT_RELEASE_INPUT_FILE, | |
125 | LDPT_GET_SYMBOLS, | |
126 | LDPT_ADD_INPUT_FILE, | |
127 | LDPT_ADD_INPUT_LIBRARY, | |
128 | LDPT_SET_EXTRA_LIBRARY_PATH | |
129 | }; | |
130 | ||
131 | /* How many entries in the constant leading part of the tv array. */ | |
132 | static const size_t tv_header_size = ARRAY_SIZE (tv_header_tags); | |
133 | ||
9e2278f5 AM |
134 | /* Forward references. */ |
135 | static bfd_boolean plugin_notice (struct bfd_link_info *info, | |
136 | const char *name, bfd *abfd, | |
137 | asection *section, bfd_vma value); | |
138 | static bfd_boolean plugin_multiple_definition (struct bfd_link_info *info, | |
24f58f47 AM |
139 | struct bfd_link_hash_entry *h, |
140 | bfd *nbfd, | |
9e2278f5 AM |
141 | asection *nsec, |
142 | bfd_vma nval); | |
143 | ||
3917d5d5 DK |
144 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
145 | ||
146 | #define RTLD_NOW 0 /* Dummy value. */ | |
147 | ||
148 | static void * | |
149 | dlopen (const char *file, int mode ATTRIBUTE_UNUSED) | |
150 | { | |
151 | return LoadLibrary (file); | |
152 | } | |
153 | ||
154 | static void * | |
155 | dlsym (void *handle, const char *name) | |
156 | { | |
157 | return GetProcAddress (handle, name); | |
158 | } | |
159 | ||
160 | static int | |
161 | dlclose (void *handle) | |
162 | { | |
163 | FreeLibrary (handle); | |
164 | return 0; | |
165 | } | |
166 | ||
167 | #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */ | |
168 | ||
5d3236ee DK |
169 | /* Helper function for exiting with error status. */ |
170 | static int | |
171 | set_plugin_error (const char *plugin) | |
172 | { | |
173 | error_plugin = plugin; | |
174 | return -1; | |
175 | } | |
176 | ||
177 | /* Test if an error occurred. */ | |
178 | static bfd_boolean | |
179 | plugin_error_p (void) | |
180 | { | |
181 | return error_plugin != NULL; | |
182 | } | |
183 | ||
184 | /* Return name of plugin which caused an error if any. */ | |
d44ad554 DK |
185 | const char * |
186 | plugin_error_plugin (void) | |
5d3236ee DK |
187 | { |
188 | return error_plugin ? error_plugin : _("<no plugin>"); | |
189 | } | |
190 | ||
191 | /* Handle -plugin arg: find and load plugin, or return error. */ | |
d44ad554 DK |
192 | int |
193 | plugin_opt_plugin (const char *plugin) | |
5d3236ee DK |
194 | { |
195 | plugin_t *newplug; | |
196 | ||
197 | newplug = xmalloc (sizeof *newplug); | |
198 | memset (newplug, 0, sizeof *newplug); | |
199 | newplug->name = plugin; | |
200 | newplug->dlhandle = dlopen (plugin, RTLD_NOW); | |
201 | if (!newplug->dlhandle) | |
202 | return set_plugin_error (plugin); | |
203 | ||
204 | /* Chain on end, so when we run list it is in command-line order. */ | |
205 | *plugins_tail_chain_ptr = newplug; | |
206 | plugins_tail_chain_ptr = &newplug->next; | |
207 | ||
208 | /* Record it as current plugin for receiving args. */ | |
209 | last_plugin = newplug; | |
210 | last_plugin_args_tail_chain_ptr = &newplug->args; | |
211 | return 0; | |
212 | } | |
213 | ||
214 | /* Accumulate option arguments for last-loaded plugin, or return | |
215 | error if none. */ | |
d44ad554 DK |
216 | int |
217 | plugin_opt_plugin_arg (const char *arg) | |
5d3236ee DK |
218 | { |
219 | plugin_arg_t *newarg; | |
220 | ||
221 | if (!last_plugin) | |
222 | return set_plugin_error (_("<no plugin>")); | |
223 | ||
224 | newarg = xmalloc (sizeof *newarg); | |
225 | newarg->arg = arg; | |
226 | newarg->next = NULL; | |
227 | ||
228 | /* Chain on end to preserve command-line order. */ | |
229 | *last_plugin_args_tail_chain_ptr = newarg; | |
230 | last_plugin_args_tail_chain_ptr = &newarg->next; | |
231 | last_plugin->n_args++; | |
232 | return 0; | |
233 | } | |
234 | ||
235 | /* Create a dummy BFD. */ | |
236 | bfd * | |
237 | plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate) | |
238 | { | |
bc110b6e AM |
239 | bfd *abfd; |
240 | ||
241 | bfd_use_reserved_id = 1; | |
9e2278f5 | 242 | abfd = bfd_create (concat (name, IRONLY_SUFFIX, (const char *) NULL), |
bc110b6e | 243 | srctemplate); |
9e2278f5 AM |
244 | if (abfd != NULL) |
245 | { | |
246 | abfd->flags |= BFD_LINKER_CREATED | BFD_PLUGIN; | |
247 | bfd_set_arch_info (abfd, bfd_get_arch_info (srctemplate)); | |
248 | bfd_set_gp_size (abfd, bfd_get_gp_size (srctemplate)); | |
249 | if (bfd_make_writable (abfd) | |
250 | && bfd_copy_private_bfd_data (srctemplate, abfd)) | |
251 | { | |
252 | flagword flags; | |
253 | ||
254 | /* Create sections to own the symbols. */ | |
255 | flags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY | |
256 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE); | |
257 | if (bfd_make_section_anyway_with_flags (abfd, ".text", flags)) | |
258 | return abfd; | |
259 | } | |
260 | } | |
261 | einfo (_("could not create dummy IR bfd: %F%E\n")); | |
262 | return NULL; | |
5d3236ee DK |
263 | } |
264 | ||
d44ad554 DK |
265 | /* Check if the BFD passed in is an IR dummy object file. */ |
266 | static bfd_boolean | |
5d3236ee DK |
267 | is_ir_dummy_bfd (const bfd *abfd) |
268 | { | |
cf4dc96f DK |
269 | /* ABFD can sometimes legitimately be NULL, e.g. when called from one |
270 | of the linker callbacks for a symbol in the *ABS* or *UND* sections. | |
271 | Likewise, the usrdata field may be NULL if ABFD was added by the | |
272 | backend without a corresponding input statement, as happens e.g. | |
273 | when processing DT_NEEDED dependencies. */ | |
9e2278f5 AM |
274 | return (abfd |
275 | && abfd->usrdata | |
276 | && ((lang_input_statement_type *)(abfd->usrdata))->claimed); | |
5d3236ee DK |
277 | } |
278 | ||
279 | /* Helpers to convert between BFD and GOLD symbol formats. */ | |
280 | static enum ld_plugin_status | |
281 | asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, | |
f84854b6 | 282 | const struct ld_plugin_symbol *ldsym) |
5d3236ee DK |
283 | { |
284 | flagword flags = BSF_NO_FLAGS; | |
285 | struct bfd_section *section; | |
286 | ||
287 | asym->the_bfd = abfd; | |
f84854b6 | 288 | asym->name = (ldsym->version |
9e2278f5 | 289 | ? concat (ldsym->name, "@", ldsym->version, (const char *) NULL) |
f84854b6 | 290 | : ldsym->name); |
5d3236ee DK |
291 | asym->value = 0; |
292 | switch (ldsym->def) | |
293 | { | |
294 | case LDPK_WEAKDEF: | |
295 | flags = BSF_WEAK; | |
296 | /* FALLTHRU */ | |
297 | case LDPK_DEF: | |
298 | flags |= BSF_GLOBAL; | |
299 | section = bfd_get_section_by_name (abfd, ".text"); | |
300 | break; | |
301 | ||
302 | case LDPK_WEAKUNDEF: | |
303 | flags = BSF_WEAK; | |
304 | /* FALLTHRU */ | |
305 | case LDPK_UNDEF: | |
306 | section = bfd_und_section_ptr; | |
307 | break; | |
308 | ||
309 | case LDPK_COMMON: | |
310 | flags = BSF_GLOBAL; | |
311 | section = bfd_com_section_ptr; | |
312 | asym->value = ldsym->size; | |
5c08b7d4 L |
313 | /* For ELF targets, set alignment of common symbol to 1. */ |
314 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
315 | ((elf_symbol_type *) asym)->internal_elf_sym.st_value = 1; | |
5d3236ee DK |
316 | break; |
317 | ||
318 | default: | |
319 | return LDPS_ERR; | |
320 | } | |
321 | asym->flags = flags; | |
322 | asym->section = section; | |
323 | ||
324 | /* Visibility only applies on ELF targets. */ | |
325 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
326 | { | |
327 | elf_symbol_type *elfsym = elf_symbol_from (abfd, asym); | |
cfac8028 L |
328 | unsigned char visibility; |
329 | ||
5d3236ee | 330 | if (!elfsym) |
ea360572 | 331 | einfo (_("%P%F: %s: non-ELF symbol in ELF BFD!\n"), asym->name); |
cfac8028 L |
332 | switch (ldsym->visibility) |
333 | { | |
334 | default: | |
ea360572 | 335 | einfo (_("%P%F: unknown ELF symbol visibility: %d!\n"), |
cfac8028 L |
336 | ldsym->visibility); |
337 | case LDPV_DEFAULT: | |
338 | visibility = STV_DEFAULT; | |
339 | break; | |
340 | case LDPV_PROTECTED: | |
341 | visibility = STV_PROTECTED; | |
342 | break; | |
343 | case LDPV_INTERNAL: | |
344 | visibility = STV_INTERNAL; | |
345 | break; | |
346 | case LDPV_HIDDEN: | |
347 | visibility = STV_HIDDEN; | |
348 | break; | |
349 | } | |
350 | elfsym->internal_elf_sym.st_other | |
351 | = (visibility | (elfsym->internal_elf_sym.st_other | |
352 | & ~ELF_ST_VISIBILITY (-1))); | |
5d3236ee DK |
353 | } |
354 | ||
355 | return LDPS_OK; | |
356 | } | |
357 | ||
358 | /* Register a claim-file handler. */ | |
359 | static enum ld_plugin_status | |
360 | register_claim_file (ld_plugin_claim_file_handler handler) | |
361 | { | |
362 | ASSERT (called_plugin); | |
363 | called_plugin->claim_file_handler = handler; | |
364 | return LDPS_OK; | |
365 | } | |
366 | ||
367 | /* Register an all-symbols-read handler. */ | |
368 | static enum ld_plugin_status | |
369 | register_all_symbols_read (ld_plugin_all_symbols_read_handler handler) | |
370 | { | |
371 | ASSERT (called_plugin); | |
372 | called_plugin->all_symbols_read_handler = handler; | |
373 | return LDPS_OK; | |
374 | } | |
375 | ||
376 | /* Register a cleanup handler. */ | |
377 | static enum ld_plugin_status | |
378 | register_cleanup (ld_plugin_cleanup_handler handler) | |
379 | { | |
380 | ASSERT (called_plugin); | |
381 | called_plugin->cleanup_handler = handler; | |
382 | return LDPS_OK; | |
383 | } | |
384 | ||
385 | /* Add symbols from a plugin-claimed input file. */ | |
386 | static enum ld_plugin_status | |
387 | add_symbols (void *handle, int nsyms, const struct ld_plugin_symbol *syms) | |
388 | { | |
389 | asymbol **symptrs; | |
390 | bfd *abfd = handle; | |
391 | int n; | |
392 | ASSERT (called_plugin); | |
393 | symptrs = xmalloc (nsyms * sizeof *symptrs); | |
394 | for (n = 0; n < nsyms; n++) | |
395 | { | |
396 | enum ld_plugin_status rv; | |
397 | asymbol *bfdsym = bfd_make_empty_symbol (abfd); | |
398 | symptrs[n] = bfdsym; | |
399 | rv = asymbol_from_plugin_symbol (abfd, bfdsym, syms + n); | |
400 | if (rv != LDPS_OK) | |
401 | return rv; | |
402 | } | |
403 | bfd_set_symtab (abfd, symptrs, nsyms); | |
404 | return LDPS_OK; | |
405 | } | |
406 | ||
407 | /* Get the input file information with an open (possibly re-opened) | |
408 | file descriptor. */ | |
409 | static enum ld_plugin_status | |
410 | get_input_file (const void *handle, struct ld_plugin_input_file *file) | |
411 | { | |
412 | ASSERT (called_plugin); | |
413 | handle = handle; | |
414 | file = file; | |
415 | return LDPS_ERR; | |
416 | } | |
417 | ||
418 | /* Release the input file. */ | |
419 | static enum ld_plugin_status | |
420 | release_input_file (const void *handle) | |
421 | { | |
422 | ASSERT (called_plugin); | |
423 | handle = handle; | |
424 | return LDPS_ERR; | |
425 | } | |
426 | ||
42a851a9 DK |
427 | /* Return TRUE if a defined symbol might be reachable from outside the |
428 | universe of claimed objects. */ | |
429 | static inline bfd_boolean | |
430 | is_visible_from_outside (struct ld_plugin_symbol *lsym, asection *section, | |
f84854b6 | 431 | struct bfd_link_hash_entry *blhe) |
42a851a9 DK |
432 | { |
433 | /* Section's owner may be NULL if it is the absolute | |
434 | section, fortunately is_ir_dummy_bfd handles that. */ | |
435 | if (!is_ir_dummy_bfd (section->owner)) | |
436 | return TRUE; | |
437 | if (link_info.relocatable) | |
438 | return TRUE; | |
439 | if (link_info.export_dynamic || link_info.shared) | |
440 | { | |
441 | /* Only ELF symbols really have visibility. */ | |
442 | if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour) | |
443 | { | |
444 | struct elf_link_hash_entry *el = (struct elf_link_hash_entry *)blhe; | |
445 | int vis = ELF_ST_VISIBILITY (el->other); | |
446 | return vis == STV_DEFAULT || vis == STV_PROTECTED; | |
447 | } | |
448 | /* On non-ELF targets, we can safely make inferences by considering | |
f84854b6 | 449 | what visibility the plugin would have liked to apply when it first |
42a851a9 DK |
450 | sent us the symbol. During ELF symbol processing, visibility only |
451 | ever becomes more restrictive, not less, when symbols are merged, | |
452 | so this is a conservative estimate; it may give false positives, | |
453 | declaring something visible from outside when it in fact would | |
454 | not have been, but this will only lead to missed optimisation | |
455 | opportunities during LTRANS at worst; it will not give false | |
456 | negatives, which can lead to the disastrous conclusion that the | |
457 | related symbol is IRONLY. (See GCC PR46319 for an example.) */ | |
cfac8028 L |
458 | return (lsym->visibility == LDPV_DEFAULT |
459 | || lsym->visibility == LDPV_PROTECTED); | |
42a851a9 DK |
460 | } |
461 | return FALSE; | |
462 | } | |
463 | ||
5d3236ee DK |
464 | /* Get the symbol resolution info for a plugin-claimed input file. */ |
465 | static enum ld_plugin_status | |
466 | get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
467 | { | |
468 | const bfd *abfd = handle; | |
469 | int n; | |
470 | ASSERT (called_plugin); | |
471 | for (n = 0; n < nsyms; n++) | |
472 | { | |
473 | struct bfd_link_hash_entry *blhe; | |
474 | bfd_boolean ironly; | |
42a851a9 | 475 | asection *owner_sec; |
10be1b6a DK |
476 | if (syms[n].def != LDPK_UNDEF) |
477 | blhe = bfd_link_hash_lookup (link_info.hash, syms[n].name, | |
478 | FALSE, FALSE, TRUE); | |
479 | else | |
480 | blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, &link_info, | |
481 | syms[n].name, FALSE, FALSE, TRUE); | |
5d3236ee DK |
482 | if (!blhe) |
483 | { | |
484 | syms[n].resolution = LDPR_UNKNOWN; | |
1715a13c | 485 | goto report_symbol; |
5d3236ee DK |
486 | } |
487 | ||
488 | /* Determine resolution from blhe type and symbol's original type. */ | |
489 | if (blhe->type == bfd_link_hash_undefined | |
f84854b6 | 490 | || blhe->type == bfd_link_hash_undefweak) |
5d3236ee DK |
491 | { |
492 | syms[n].resolution = LDPR_UNDEF; | |
1715a13c | 493 | goto report_symbol; |
5d3236ee DK |
494 | } |
495 | if (blhe->type != bfd_link_hash_defined | |
f84854b6 L |
496 | && blhe->type != bfd_link_hash_defweak |
497 | && blhe->type != bfd_link_hash_common) | |
5d3236ee DK |
498 | { |
499 | /* We should not have a new, indirect or warning symbol here. */ | |
ea360572 | 500 | einfo ("%P%F: %s: plugin symbol table corrupt (sym type %d)\n", |
f84854b6 | 501 | called_plugin->name, blhe->type); |
5d3236ee DK |
502 | } |
503 | ||
42a851a9 DK |
504 | /* Find out which section owns the symbol. Since it's not undef, |
505 | it must have an owner; if it's not a common symbol, both defs | |
506 | and weakdefs keep it in the same place. */ | |
9e2278f5 AM |
507 | owner_sec = (blhe->type == bfd_link_hash_common |
508 | ? blhe->u.c.p->section | |
509 | : blhe->u.def.section); | |
42a851a9 DK |
510 | |
511 | /* We need to know if the sym is referenced from non-IR files. Or | |
f84854b6 | 512 | even potentially-referenced, perhaps in a future final link if |
42a851a9 DK |
513 | this is a partial one, perhaps dynamically at load-time if the |
514 | symbol is externally visible. */ | |
8ff09c12 L |
515 | ironly = (!is_visible_from_outside (&syms[n], owner_sec, blhe) |
516 | && !bfd_hash_lookup (non_ironly_hash, syms[n].name, | |
174b85fc | 517 | FALSE, FALSE)); |
5d3236ee DK |
518 | |
519 | /* If it was originally undefined or common, then it has been | |
f84854b6 L |
520 | resolved; determine how. */ |
521 | if (syms[n].def == LDPK_UNDEF | |
522 | || syms[n].def == LDPK_WEAKUNDEF | |
5d3236ee DK |
523 | || syms[n].def == LDPK_COMMON) |
524 | { | |
5d3236ee DK |
525 | if (owner_sec->owner == link_info.output_bfd) |
526 | syms[n].resolution = LDPR_RESOLVED_EXEC; | |
527 | else if (owner_sec->owner == abfd) | |
f84854b6 L |
528 | syms[n].resolution = (ironly |
529 | ? LDPR_PREVAILING_DEF_IRONLY | |
530 | : LDPR_PREVAILING_DEF); | |
5d3236ee DK |
531 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
532 | syms[n].resolution = LDPR_RESOLVED_IR; | |
cc322803 L |
533 | else if (owner_sec->owner != NULL |
534 | && (owner_sec->owner->flags & DYNAMIC) != 0) | |
5d3236ee DK |
535 | syms[n].resolution = LDPR_RESOLVED_DYN; |
536 | else | |
537 | syms[n].resolution = LDPR_RESOLVED_EXEC; | |
1715a13c | 538 | goto report_symbol; |
5d3236ee DK |
539 | } |
540 | ||
541 | /* Was originally def, or weakdef. Does it prevail? If the | |
f84854b6 | 542 | owner is the original dummy bfd that supplied it, then this |
5d3236ee | 543 | is the definition that has prevailed. */ |
42a851a9 | 544 | if (owner_sec->owner == link_info.output_bfd) |
5d3236ee | 545 | syms[n].resolution = LDPR_PREEMPTED_REG; |
42a851a9 | 546 | else if (owner_sec->owner == abfd) |
5d3236ee | 547 | { |
f84854b6 | 548 | syms[n].resolution = (ironly |
5d3236ee | 549 | ? LDPR_PREVAILING_DEF_IRONLY |
f84854b6 | 550 | : LDPR_PREVAILING_DEF); |
1715a13c | 551 | goto report_symbol; |
5d3236ee DK |
552 | } |
553 | ||
554 | /* Was originally def, weakdef, or common, but has been pre-empted. */ | |
1715a13c L |
555 | syms[n].resolution = (is_ir_dummy_bfd (owner_sec->owner) |
556 | ? LDPR_PREEMPTED_IR | |
557 | : LDPR_PREEMPTED_REG); | |
558 | ||
9e2278f5 | 559 | report_symbol: |
1715a13c | 560 | if (report_plugin_symbols) |
9e2278f5 AM |
561 | einfo (_("%P: %B: symbol `%s' " |
562 | "definition: %d, visibility: %d, resolution: %d\n"), | |
563 | abfd, syms[n].name, | |
564 | syms[n].def, syms[n].visibility, syms[n].resolution); | |
5d3236ee DK |
565 | } |
566 | return LDPS_OK; | |
567 | } | |
568 | ||
569 | /* Add a new (real) input file generated by a plugin. */ | |
570 | static enum ld_plugin_status | |
571 | add_input_file (const char *pathname) | |
572 | { | |
573 | ASSERT (called_plugin); | |
d4cb7acd | 574 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_file_enum, |
f84854b6 | 575 | NULL)) |
5d3236ee DK |
576 | return LDPS_ERR; |
577 | return LDPS_OK; | |
578 | } | |
579 | ||
580 | /* Add a new (real) library required by a plugin. */ | |
581 | static enum ld_plugin_status | |
582 | add_input_library (const char *pathname) | |
583 | { | |
584 | ASSERT (called_plugin); | |
d4cb7acd | 585 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_l_enum, |
f84854b6 | 586 | NULL)) |
5d3236ee DK |
587 | return LDPS_ERR; |
588 | return LDPS_OK; | |
589 | } | |
590 | ||
591 | /* Set the extra library path to be used by libraries added via | |
592 | add_input_library. */ | |
593 | static enum ld_plugin_status | |
594 | set_extra_library_path (const char *path) | |
595 | { | |
596 | ASSERT (called_plugin); | |
d4cb7acd | 597 | ldfile_add_library_path (xstrdup (path), FALSE); |
5d3236ee DK |
598 | return LDPS_OK; |
599 | } | |
600 | ||
601 | /* Issue a diagnostic message from a plugin. */ | |
602 | static enum ld_plugin_status | |
603 | message (int level, const char *format, ...) | |
604 | { | |
605 | va_list args; | |
606 | va_start (args, format); | |
607 | ||
608 | switch (level) | |
609 | { | |
610 | case LDPL_INFO: | |
611 | vfinfo (stdout, format, args, FALSE); | |
d251c5c4 | 612 | putchar ('\n'); |
5d3236ee DK |
613 | break; |
614 | case LDPL_WARNING: | |
615 | vfinfo (stdout, format, args, TRUE); | |
d251c5c4 | 616 | putchar ('\n'); |
5d3236ee DK |
617 | break; |
618 | case LDPL_FATAL: | |
619 | case LDPL_ERROR: | |
620 | default: | |
9e2278f5 AM |
621 | { |
622 | char *newfmt = ACONCAT ((level == LDPL_FATAL ? "%P%F: " : "%P%X: ", | |
623 | format, "\n", (const char *) NULL)); | |
624 | fflush (stdout); | |
625 | vfinfo (stderr, newfmt, args, TRUE); | |
626 | fflush (stderr); | |
627 | } | |
5d3236ee DK |
628 | break; |
629 | } | |
630 | ||
631 | va_end (args); | |
632 | return LDPS_OK; | |
633 | } | |
634 | ||
635 | /* Helper to size leading part of tv array and set it up. */ | |
636 | static size_t | |
637 | set_tv_header (struct ld_plugin_tv *tv) | |
638 | { | |
639 | size_t i; | |
640 | ||
641 | /* Version info. */ | |
642 | static const unsigned int major = (unsigned)(BFD_VERSION / 100000000UL); | |
643 | static const unsigned int minor = (unsigned)(BFD_VERSION / 1000000UL) % 100; | |
644 | ||
645 | if (!tv) | |
646 | return tv_header_size; | |
647 | ||
648 | for (i = 0; i < tv_header_size; i++) | |
649 | { | |
650 | tv[i].tv_tag = tv_header_tags[i]; | |
651 | #define TVU(x) tv[i].tv_u.tv_ ## x | |
652 | switch (tv[i].tv_tag) | |
653 | { | |
f84854b6 L |
654 | case LDPT_MESSAGE: |
655 | TVU(message) = message; | |
656 | break; | |
657 | case LDPT_API_VERSION: | |
658 | TVU(val) = LD_PLUGIN_API_VERSION; | |
659 | break; | |
660 | case LDPT_GNU_LD_VERSION: | |
661 | TVU(val) = major * 100 + minor; | |
662 | break; | |
663 | case LDPT_LINKER_OUTPUT: | |
664 | TVU(val) = (link_info.relocatable | |
665 | ? LDPO_REL | |
666 | : (link_info.shared ? LDPO_DYN : LDPO_EXEC)); | |
667 | break; | |
668 | case LDPT_OUTPUT_NAME: | |
669 | TVU(string) = output_filename; | |
670 | break; | |
671 | case LDPT_REGISTER_CLAIM_FILE_HOOK: | |
672 | TVU(register_claim_file) = register_claim_file; | |
673 | break; | |
674 | case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: | |
675 | TVU(register_all_symbols_read) = register_all_symbols_read; | |
676 | break; | |
677 | case LDPT_REGISTER_CLEANUP_HOOK: | |
678 | TVU(register_cleanup) = register_cleanup; | |
679 | break; | |
680 | case LDPT_ADD_SYMBOLS: | |
681 | TVU(add_symbols) = add_symbols; | |
682 | break; | |
683 | case LDPT_GET_INPUT_FILE: | |
684 | TVU(get_input_file) = get_input_file; | |
685 | break; | |
686 | case LDPT_RELEASE_INPUT_FILE: | |
687 | TVU(release_input_file) = release_input_file; | |
688 | break; | |
689 | case LDPT_GET_SYMBOLS: | |
690 | TVU(get_symbols) = get_symbols; | |
691 | break; | |
692 | case LDPT_ADD_INPUT_FILE: | |
693 | TVU(add_input_file) = add_input_file; | |
694 | break; | |
695 | case LDPT_ADD_INPUT_LIBRARY: | |
696 | TVU(add_input_library) = add_input_library; | |
697 | break; | |
698 | case LDPT_SET_EXTRA_LIBRARY_PATH: | |
699 | TVU(set_extra_library_path) = set_extra_library_path; | |
700 | break; | |
701 | default: | |
702 | /* Added a new entry to the array without adding | |
703 | a new case to set up its value is a bug. */ | |
704 | FAIL (); | |
5d3236ee DK |
705 | } |
706 | #undef TVU | |
707 | } | |
708 | return tv_header_size; | |
709 | } | |
710 | ||
711 | /* Append the per-plugin args list and trailing LDPT_NULL to tv. */ | |
712 | static void | |
713 | set_tv_plugin_args (plugin_t *plugin, struct ld_plugin_tv *tv) | |
714 | { | |
715 | plugin_arg_t *arg = plugin->args; | |
716 | while (arg) | |
717 | { | |
718 | tv->tv_tag = LDPT_OPTION; | |
719 | tv->tv_u.tv_string = arg->arg; | |
720 | arg = arg->next; | |
721 | tv++; | |
722 | } | |
723 | tv->tv_tag = LDPT_NULL; | |
724 | tv->tv_u.tv_val = 0; | |
725 | } | |
726 | ||
d44ad554 DK |
727 | /* Return true if any plugins are active this run. Only valid |
728 | after options have been processed. */ | |
729 | bfd_boolean | |
730 | plugin_active_plugins_p (void) | |
731 | { | |
732 | return plugins_list != NULL; | |
733 | } | |
734 | ||
9e2278f5 AM |
735 | /* Init the non_ironly hash table. */ |
736 | static void | |
737 | init_non_ironly_hash (void) | |
738 | { | |
739 | struct bfd_sym_chain *sym; | |
740 | ||
741 | non_ironly_hash | |
742 | = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table)); | |
743 | if (!bfd_hash_table_init_n (non_ironly_hash, | |
744 | bfd_hash_newfunc, | |
745 | sizeof (struct bfd_hash_entry), | |
746 | 61)) | |
747 | einfo (_("%P%F: bfd_hash_table_init failed: %E\n")); | |
748 | ||
749 | for (sym = &entry_symbol; sym != NULL; sym = sym->next) | |
750 | if (sym->name | |
751 | && !bfd_hash_lookup (non_ironly_hash, sym->name, TRUE, TRUE)) | |
752 | einfo (_("%P%X: hash table failure adding symbol %s\n"), | |
753 | sym->name); | |
754 | } | |
755 | ||
5d3236ee | 756 | /* Load up and initialise all plugins after argument parsing. */ |
d44ad554 DK |
757 | int |
758 | plugin_load_plugins (void) | |
5d3236ee DK |
759 | { |
760 | struct ld_plugin_tv *my_tv; | |
761 | unsigned int max_args = 0; | |
762 | plugin_t *curplug = plugins_list; | |
763 | ||
764 | /* If there are no plugins, we need do nothing this run. */ | |
765 | if (!curplug) | |
766 | return 0; | |
767 | ||
768 | /* First pass over plugins to find max # args needed so that we | |
769 | can size and allocate the tv array. */ | |
770 | while (curplug) | |
771 | { | |
772 | if (curplug->n_args > max_args) | |
773 | max_args = curplug->n_args; | |
774 | curplug = curplug->next; | |
775 | } | |
776 | ||
777 | /* Allocate tv array and initialise constant part. */ | |
778 | my_tv = xmalloc ((max_args + 1 + tv_header_size) * sizeof *my_tv); | |
779 | set_tv_header (my_tv); | |
780 | ||
781 | /* Pass over plugins again, activating them. */ | |
782 | curplug = plugins_list; | |
783 | while (curplug) | |
784 | { | |
785 | enum ld_plugin_status rv; | |
786 | ld_plugin_onload onloadfn = dlsym (curplug->dlhandle, "onload"); | |
787 | if (!onloadfn) | |
788 | onloadfn = dlsym (curplug->dlhandle, "_onload"); | |
789 | if (!onloadfn) | |
f84854b6 | 790 | return set_plugin_error (curplug->name); |
5d3236ee DK |
791 | set_tv_plugin_args (curplug, &my_tv[tv_header_size]); |
792 | called_plugin = curplug; | |
793 | rv = (*onloadfn) (my_tv); | |
794 | called_plugin = NULL; | |
795 | if (rv != LDPS_OK) | |
f84854b6 | 796 | return set_plugin_error (curplug->name); |
5d3236ee DK |
797 | curplug = curplug->next; |
798 | } | |
799 | ||
800 | /* Since plugin(s) inited ok, assume they're going to want symbol | |
801 | resolutions, which needs us to track which symbols are referenced | |
802 | by non-IR files using the linker's notice callback. */ | |
9e2278f5 AM |
803 | orig_notice_all = link_info.notice_all; |
804 | orig_callbacks = link_info.callbacks; | |
805 | plugin_callbacks = *orig_callbacks; | |
806 | plugin_callbacks.notice = &plugin_notice; | |
5d3236ee | 807 | link_info.notice_all = TRUE; |
9e2278f5 AM |
808 | link_info.callbacks = &plugin_callbacks; |
809 | init_non_ironly_hash (); | |
5d3236ee DK |
810 | |
811 | return 0; | |
812 | } | |
813 | ||
814 | /* Call 'claim file' hook for all plugins. */ | |
815 | int | |
816 | plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed) | |
817 | { | |
818 | plugin_t *curplug = plugins_list; | |
819 | *claimed = FALSE; | |
820 | if (no_more_claiming) | |
821 | return 0; | |
822 | while (curplug && !*claimed) | |
823 | { | |
824 | if (curplug->claim_file_handler) | |
825 | { | |
826 | enum ld_plugin_status rv; | |
827 | called_plugin = curplug; | |
828 | rv = (*curplug->claim_file_handler) (file, claimed); | |
829 | called_plugin = NULL; | |
830 | if (rv != LDPS_OK) | |
831 | set_plugin_error (curplug->name); | |
832 | } | |
833 | curplug = curplug->next; | |
834 | } | |
835 | return plugin_error_p () ? -1 : 0; | |
836 | } | |
837 | ||
838 | /* Call 'all symbols read' hook for all plugins. */ | |
839 | int | |
840 | plugin_call_all_symbols_read (void) | |
841 | { | |
842 | plugin_t *curplug = plugins_list; | |
843 | ||
844 | /* Disable any further file-claiming. */ | |
845 | no_more_claiming = TRUE; | |
846 | ||
9e2278f5 | 847 | plugin_callbacks.multiple_definition = &plugin_multiple_definition; |
5d3236ee DK |
848 | |
849 | while (curplug) | |
850 | { | |
851 | if (curplug->all_symbols_read_handler) | |
852 | { | |
853 | enum ld_plugin_status rv; | |
854 | called_plugin = curplug; | |
855 | rv = (*curplug->all_symbols_read_handler) (); | |
856 | called_plugin = NULL; | |
857 | if (rv != LDPS_OK) | |
858 | set_plugin_error (curplug->name); | |
859 | } | |
860 | curplug = curplug->next; | |
861 | } | |
862 | return plugin_error_p () ? -1 : 0; | |
863 | } | |
864 | ||
e73d965c | 865 | /* Call 'cleanup' hook for all plugins at exit. */ |
498cd2a0 | 866 | void |
5d3236ee DK |
867 | plugin_call_cleanup (void) |
868 | { | |
869 | plugin_t *curplug = plugins_list; | |
870 | while (curplug) | |
871 | { | |
872 | if (curplug->cleanup_handler && !curplug->cleanup_done) | |
873 | { | |
874 | enum ld_plugin_status rv; | |
875 | curplug->cleanup_done = TRUE; | |
876 | called_plugin = curplug; | |
877 | rv = (*curplug->cleanup_handler) (); | |
878 | called_plugin = NULL; | |
879 | if (rv != LDPS_OK) | |
880 | set_plugin_error (curplug->name); | |
881 | dlclose (curplug->dlhandle); | |
882 | } | |
883 | curplug = curplug->next; | |
884 | } | |
e73d965c L |
885 | if (plugin_error_p ()) |
886 | info_msg (_("%P: %s: error in plugin cleanup (ignored)\n"), | |
887 | plugin_error_plugin ()); | |
5d3236ee DK |
888 | } |
889 | ||
5d3236ee DK |
890 | /* To determine which symbols should be resolved LDPR_PREVAILING_DEF |
891 | and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as | |
892 | the linker adds them to the linker hash table. If we see a symbol | |
893 | being referenced from a non-IR file, we add it to the non_ironly hash | |
894 | table. If we can't find it there at get_symbols time, we know that | |
895 | it was referenced only by IR files. We have to notice_all symbols, | |
896 | because we won't necessarily know until later which ones will be | |
897 | contributed by IR files. */ | |
9e2278f5 AM |
898 | static bfd_boolean |
899 | plugin_notice (struct bfd_link_info *info, | |
900 | const char *name, | |
901 | bfd *abfd, | |
902 | asection *section, | |
903 | bfd_vma value) | |
5d3236ee | 904 | { |
9e2278f5 | 905 | if (name != NULL) |
5d3236ee | 906 | { |
9e2278f5 AM |
907 | /* No further processing if this def/ref is from an IR dummy BFD. */ |
908 | if (is_ir_dummy_bfd (abfd)) | |
909 | return TRUE; | |
910 | ||
911 | /* We only care about refs, not defs, indicated by section | |
912 | pointing to the undefined section (according to the bfd | |
913 | linker notice callback interface definition). */ | |
914 | if (bfd_is_und_section (section)) | |
915 | { | |
916 | /* This is a ref from a non-IR file, so note the ref'd | |
917 | symbol in the non-IR-only hash. */ | |
918 | if (!bfd_hash_lookup (non_ironly_hash, name, TRUE, TRUE)) | |
919 | einfo (_("%P%X: %s: hash table failure adding symbol %s\n"), | |
920 | abfd->filename, name); | |
921 | } | |
5d3236ee DK |
922 | } |
923 | ||
924 | /* Continue with cref/nocrossref/trace-sym processing. */ | |
9e2278f5 AM |
925 | if (name == NULL |
926 | || orig_notice_all | |
927 | || (info->notice_hash != NULL | |
928 | && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)) | |
929 | return (*orig_callbacks->notice) (info, name, abfd, section, value); | |
5d3236ee DK |
930 | return TRUE; |
931 | } | |
932 | ||
933 | /* When we add new object files to the link at all symbols read time, | |
934 | these contain the real code and symbols generated from the IR files, | |
935 | and so duplicate all the definitions already supplied by the dummy | |
936 | IR-only BFDs that we created at claim files time. We use the linker's | |
937 | multiple-definitions callback hook to fix up the clash, discarding | |
938 | the symbol from the IR-only BFD in favour of the symbol from the | |
939 | real BFD. We return true if this was not-really-a-clash because | |
940 | we've fixed it up, or anyway if --allow-multiple-definition was in | |
941 | effect (before we disabled it to ensure we got called back). */ | |
9e2278f5 | 942 | static bfd_boolean |
24f58f47 AM |
943 | plugin_multiple_definition (struct bfd_link_info *info, |
944 | struct bfd_link_hash_entry *h, | |
f84854b6 | 945 | bfd *nbfd, asection *nsec, bfd_vma nval) |
5d3236ee | 946 | { |
24f58f47 AM |
947 | if (h->type == bfd_link_hash_defined |
948 | && is_ir_dummy_bfd (h->u.def.section->owner)) | |
5d3236ee | 949 | { |
5d3236ee | 950 | /* Replace it with new details. */ |
24f58f47 AM |
951 | h->u.def.section = nsec; |
952 | h->u.def.value = nval; | |
5d3236ee DK |
953 | return TRUE; |
954 | } | |
9e2278f5 | 955 | |
24f58f47 | 956 | return (*orig_callbacks->multiple_definition) (info, h, nbfd, nsec, nval); |
5d3236ee | 957 | } |