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 DK |
35 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
36 | #include <Windows.h> | |
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 | ||
100 | /* Set at all symbols read time, to avoid recursively offering the plugin | |
101 | its own newly-added input files and libs to claim. */ | |
102 | static bfd_boolean no_more_claiming = FALSE; | |
103 | ||
104 | /* If the --allow-multiple-definition command-line option is active, we | |
105 | have to disable it so that BFD always calls our hook, and simulate the | |
106 | effect (when not resolving IR vs. real symbols) ourselves by ensuring | |
107 | TRUE is returned from the hook. */ | |
108 | static bfd_boolean plugin_cached_allow_multiple_defs = FALSE; | |
109 | ||
110 | /* List of tags to set in the constant leading part of the tv array. */ | |
111 | static const enum ld_plugin_tag tv_header_tags[] = | |
112 | { | |
113 | LDPT_MESSAGE, | |
114 | LDPT_API_VERSION, | |
115 | LDPT_GNU_LD_VERSION, | |
116 | LDPT_LINKER_OUTPUT, | |
117 | LDPT_OUTPUT_NAME, | |
118 | LDPT_REGISTER_CLAIM_FILE_HOOK, | |
119 | LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK, | |
120 | LDPT_REGISTER_CLEANUP_HOOK, | |
121 | LDPT_ADD_SYMBOLS, | |
122 | LDPT_GET_INPUT_FILE, | |
123 | LDPT_RELEASE_INPUT_FILE, | |
124 | LDPT_GET_SYMBOLS, | |
125 | LDPT_ADD_INPUT_FILE, | |
126 | LDPT_ADD_INPUT_LIBRARY, | |
127 | LDPT_SET_EXTRA_LIBRARY_PATH | |
128 | }; | |
129 | ||
130 | /* How many entries in the constant leading part of the tv array. */ | |
131 | static const size_t tv_header_size = ARRAY_SIZE (tv_header_tags); | |
132 | ||
3917d5d5 DK |
133 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
134 | ||
135 | #define RTLD_NOW 0 /* Dummy value. */ | |
136 | ||
137 | static void * | |
138 | dlopen (const char *file, int mode ATTRIBUTE_UNUSED) | |
139 | { | |
140 | return LoadLibrary (file); | |
141 | } | |
142 | ||
143 | static void * | |
144 | dlsym (void *handle, const char *name) | |
145 | { | |
146 | return GetProcAddress (handle, name); | |
147 | } | |
148 | ||
149 | static int | |
150 | dlclose (void *handle) | |
151 | { | |
152 | FreeLibrary (handle); | |
153 | return 0; | |
154 | } | |
155 | ||
156 | #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */ | |
157 | ||
5d3236ee DK |
158 | /* Helper function for exiting with error status. */ |
159 | static int | |
160 | set_plugin_error (const char *plugin) | |
161 | { | |
162 | error_plugin = plugin; | |
163 | return -1; | |
164 | } | |
165 | ||
166 | /* Test if an error occurred. */ | |
167 | static bfd_boolean | |
168 | plugin_error_p (void) | |
169 | { | |
170 | return error_plugin != NULL; | |
171 | } | |
172 | ||
173 | /* Return name of plugin which caused an error if any. */ | |
d44ad554 DK |
174 | const char * |
175 | plugin_error_plugin (void) | |
5d3236ee DK |
176 | { |
177 | return error_plugin ? error_plugin : _("<no plugin>"); | |
178 | } | |
179 | ||
180 | /* Handle -plugin arg: find and load plugin, or return error. */ | |
d44ad554 DK |
181 | int |
182 | plugin_opt_plugin (const char *plugin) | |
5d3236ee DK |
183 | { |
184 | plugin_t *newplug; | |
185 | ||
186 | newplug = xmalloc (sizeof *newplug); | |
187 | memset (newplug, 0, sizeof *newplug); | |
188 | newplug->name = plugin; | |
189 | newplug->dlhandle = dlopen (plugin, RTLD_NOW); | |
190 | if (!newplug->dlhandle) | |
191 | return set_plugin_error (plugin); | |
192 | ||
193 | /* Chain on end, so when we run list it is in command-line order. */ | |
194 | *plugins_tail_chain_ptr = newplug; | |
195 | plugins_tail_chain_ptr = &newplug->next; | |
196 | ||
197 | /* Record it as current plugin for receiving args. */ | |
198 | last_plugin = newplug; | |
199 | last_plugin_args_tail_chain_ptr = &newplug->args; | |
200 | return 0; | |
201 | } | |
202 | ||
203 | /* Accumulate option arguments for last-loaded plugin, or return | |
204 | error if none. */ | |
d44ad554 DK |
205 | int |
206 | plugin_opt_plugin_arg (const char *arg) | |
5d3236ee DK |
207 | { |
208 | plugin_arg_t *newarg; | |
209 | ||
210 | if (!last_plugin) | |
211 | return set_plugin_error (_("<no plugin>")); | |
212 | ||
213 | newarg = xmalloc (sizeof *newarg); | |
214 | newarg->arg = arg; | |
215 | newarg->next = NULL; | |
216 | ||
217 | /* Chain on end to preserve command-line order. */ | |
218 | *last_plugin_args_tail_chain_ptr = newarg; | |
219 | last_plugin_args_tail_chain_ptr = &newarg->next; | |
220 | last_plugin->n_args++; | |
221 | return 0; | |
222 | } | |
223 | ||
224 | /* Create a dummy BFD. */ | |
225 | bfd * | |
226 | plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate) | |
227 | { | |
228 | asection *sec; | |
bc110b6e AM |
229 | bfd *abfd; |
230 | ||
231 | bfd_use_reserved_id = 1; | |
232 | abfd = bfd_create (concat (name, IRONLY_SUFFIX, (const char *)NULL), | |
233 | srctemplate); | |
5d3236ee DK |
234 | bfd_set_arch_info (abfd, bfd_get_arch_info (srctemplate)); |
235 | bfd_make_writable (abfd); | |
ed88c97e RS |
236 | bfd_copy_private_bfd_data (srctemplate, abfd); |
237 | bfd_set_gp_size (abfd, bfd_get_gp_size (abfd)); | |
5d3236ee DK |
238 | /* Create a minimal set of sections to own the symbols. */ |
239 | sec = bfd_make_section_old_way (abfd, ".text"); | |
240 | bfd_set_section_flags (abfd, sec, | |
bc110b6e AM |
241 | (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY |
242 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP)); | |
5d3236ee DK |
243 | sec->output_section = sec; |
244 | sec->output_offset = 0; | |
245 | return abfd; | |
246 | } | |
247 | ||
d44ad554 DK |
248 | /* Check if the BFD passed in is an IR dummy object file. */ |
249 | static bfd_boolean | |
5d3236ee DK |
250 | is_ir_dummy_bfd (const bfd *abfd) |
251 | { | |
cf4dc96f DK |
252 | /* ABFD can sometimes legitimately be NULL, e.g. when called from one |
253 | of the linker callbacks for a symbol in the *ABS* or *UND* sections. | |
254 | Likewise, the usrdata field may be NULL if ABFD was added by the | |
255 | backend without a corresponding input statement, as happens e.g. | |
256 | when processing DT_NEEDED dependencies. */ | |
257 | return abfd | |
258 | && abfd->usrdata | |
259 | && ((lang_input_statement_type *)(abfd->usrdata))->claimed; | |
5d3236ee DK |
260 | } |
261 | ||
262 | /* Helpers to convert between BFD and GOLD symbol formats. */ | |
263 | static enum ld_plugin_status | |
264 | asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, | |
f84854b6 | 265 | const struct ld_plugin_symbol *ldsym) |
5d3236ee DK |
266 | { |
267 | flagword flags = BSF_NO_FLAGS; | |
268 | struct bfd_section *section; | |
269 | ||
270 | asym->the_bfd = abfd; | |
f84854b6 | 271 | asym->name = (ldsym->version |
5d3236ee | 272 | ? concat (ldsym->name, "@", ldsym->version, NULL) |
f84854b6 | 273 | : ldsym->name); |
5d3236ee DK |
274 | asym->value = 0; |
275 | switch (ldsym->def) | |
276 | { | |
277 | case LDPK_WEAKDEF: | |
278 | flags = BSF_WEAK; | |
279 | /* FALLTHRU */ | |
280 | case LDPK_DEF: | |
281 | flags |= BSF_GLOBAL; | |
282 | section = bfd_get_section_by_name (abfd, ".text"); | |
283 | break; | |
284 | ||
285 | case LDPK_WEAKUNDEF: | |
286 | flags = BSF_WEAK; | |
287 | /* FALLTHRU */ | |
288 | case LDPK_UNDEF: | |
289 | section = bfd_und_section_ptr; | |
290 | break; | |
291 | ||
292 | case LDPK_COMMON: | |
293 | flags = BSF_GLOBAL; | |
294 | section = bfd_com_section_ptr; | |
295 | asym->value = ldsym->size; | |
5c08b7d4 L |
296 | /* For ELF targets, set alignment of common symbol to 1. */ |
297 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
298 | ((elf_symbol_type *) asym)->internal_elf_sym.st_value = 1; | |
5d3236ee DK |
299 | break; |
300 | ||
301 | default: | |
302 | return LDPS_ERR; | |
303 | } | |
304 | asym->flags = flags; | |
305 | asym->section = section; | |
306 | ||
307 | /* Visibility only applies on ELF targets. */ | |
308 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
309 | { | |
310 | elf_symbol_type *elfsym = elf_symbol_from (abfd, asym); | |
cfac8028 L |
311 | unsigned char visibility; |
312 | ||
5d3236ee | 313 | if (!elfsym) |
ea360572 | 314 | einfo (_("%P%F: %s: non-ELF symbol in ELF BFD!\n"), asym->name); |
cfac8028 L |
315 | switch (ldsym->visibility) |
316 | { | |
317 | default: | |
ea360572 | 318 | einfo (_("%P%F: unknown ELF symbol visibility: %d!\n"), |
cfac8028 L |
319 | ldsym->visibility); |
320 | case LDPV_DEFAULT: | |
321 | visibility = STV_DEFAULT; | |
322 | break; | |
323 | case LDPV_PROTECTED: | |
324 | visibility = STV_PROTECTED; | |
325 | break; | |
326 | case LDPV_INTERNAL: | |
327 | visibility = STV_INTERNAL; | |
328 | break; | |
329 | case LDPV_HIDDEN: | |
330 | visibility = STV_HIDDEN; | |
331 | break; | |
332 | } | |
333 | elfsym->internal_elf_sym.st_other | |
334 | = (visibility | (elfsym->internal_elf_sym.st_other | |
335 | & ~ELF_ST_VISIBILITY (-1))); | |
5d3236ee DK |
336 | } |
337 | ||
338 | return LDPS_OK; | |
339 | } | |
340 | ||
341 | /* Register a claim-file handler. */ | |
342 | static enum ld_plugin_status | |
343 | register_claim_file (ld_plugin_claim_file_handler handler) | |
344 | { | |
345 | ASSERT (called_plugin); | |
346 | called_plugin->claim_file_handler = handler; | |
347 | return LDPS_OK; | |
348 | } | |
349 | ||
350 | /* Register an all-symbols-read handler. */ | |
351 | static enum ld_plugin_status | |
352 | register_all_symbols_read (ld_plugin_all_symbols_read_handler handler) | |
353 | { | |
354 | ASSERT (called_plugin); | |
355 | called_plugin->all_symbols_read_handler = handler; | |
356 | return LDPS_OK; | |
357 | } | |
358 | ||
359 | /* Register a cleanup handler. */ | |
360 | static enum ld_plugin_status | |
361 | register_cleanup (ld_plugin_cleanup_handler handler) | |
362 | { | |
363 | ASSERT (called_plugin); | |
364 | called_plugin->cleanup_handler = handler; | |
365 | return LDPS_OK; | |
366 | } | |
367 | ||
368 | /* Add symbols from a plugin-claimed input file. */ | |
369 | static enum ld_plugin_status | |
370 | add_symbols (void *handle, int nsyms, const struct ld_plugin_symbol *syms) | |
371 | { | |
372 | asymbol **symptrs; | |
373 | bfd *abfd = handle; | |
374 | int n; | |
375 | ASSERT (called_plugin); | |
376 | symptrs = xmalloc (nsyms * sizeof *symptrs); | |
377 | for (n = 0; n < nsyms; n++) | |
378 | { | |
379 | enum ld_plugin_status rv; | |
380 | asymbol *bfdsym = bfd_make_empty_symbol (abfd); | |
381 | symptrs[n] = bfdsym; | |
382 | rv = asymbol_from_plugin_symbol (abfd, bfdsym, syms + n); | |
383 | if (rv != LDPS_OK) | |
384 | return rv; | |
385 | } | |
386 | bfd_set_symtab (abfd, symptrs, nsyms); | |
387 | return LDPS_OK; | |
388 | } | |
389 | ||
390 | /* Get the input file information with an open (possibly re-opened) | |
391 | file descriptor. */ | |
392 | static enum ld_plugin_status | |
393 | get_input_file (const void *handle, struct ld_plugin_input_file *file) | |
394 | { | |
395 | ASSERT (called_plugin); | |
396 | handle = handle; | |
397 | file = file; | |
398 | return LDPS_ERR; | |
399 | } | |
400 | ||
401 | /* Release the input file. */ | |
402 | static enum ld_plugin_status | |
403 | release_input_file (const void *handle) | |
404 | { | |
405 | ASSERT (called_plugin); | |
406 | handle = handle; | |
407 | return LDPS_ERR; | |
408 | } | |
409 | ||
42a851a9 DK |
410 | /* Return TRUE if a defined symbol might be reachable from outside the |
411 | universe of claimed objects. */ | |
412 | static inline bfd_boolean | |
413 | is_visible_from_outside (struct ld_plugin_symbol *lsym, asection *section, | |
f84854b6 | 414 | struct bfd_link_hash_entry *blhe) |
42a851a9 DK |
415 | { |
416 | /* Section's owner may be NULL if it is the absolute | |
417 | section, fortunately is_ir_dummy_bfd handles that. */ | |
418 | if (!is_ir_dummy_bfd (section->owner)) | |
419 | return TRUE; | |
420 | if (link_info.relocatable) | |
421 | return TRUE; | |
422 | if (link_info.export_dynamic || link_info.shared) | |
423 | { | |
424 | /* Only ELF symbols really have visibility. */ | |
425 | if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour) | |
426 | { | |
427 | struct elf_link_hash_entry *el = (struct elf_link_hash_entry *)blhe; | |
428 | int vis = ELF_ST_VISIBILITY (el->other); | |
429 | return vis == STV_DEFAULT || vis == STV_PROTECTED; | |
430 | } | |
431 | /* On non-ELF targets, we can safely make inferences by considering | |
f84854b6 | 432 | what visibility the plugin would have liked to apply when it first |
42a851a9 DK |
433 | sent us the symbol. During ELF symbol processing, visibility only |
434 | ever becomes more restrictive, not less, when symbols are merged, | |
435 | so this is a conservative estimate; it may give false positives, | |
436 | declaring something visible from outside when it in fact would | |
437 | not have been, but this will only lead to missed optimisation | |
438 | opportunities during LTRANS at worst; it will not give false | |
439 | negatives, which can lead to the disastrous conclusion that the | |
440 | related symbol is IRONLY. (See GCC PR46319 for an example.) */ | |
cfac8028 L |
441 | return (lsym->visibility == LDPV_DEFAULT |
442 | || lsym->visibility == LDPV_PROTECTED); | |
42a851a9 DK |
443 | } |
444 | return FALSE; | |
445 | } | |
446 | ||
5d3236ee DK |
447 | /* Get the symbol resolution info for a plugin-claimed input file. */ |
448 | static enum ld_plugin_status | |
449 | get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
450 | { | |
451 | const bfd *abfd = handle; | |
452 | int n; | |
453 | ASSERT (called_plugin); | |
454 | for (n = 0; n < nsyms; n++) | |
455 | { | |
456 | struct bfd_link_hash_entry *blhe; | |
457 | bfd_boolean ironly; | |
42a851a9 | 458 | asection *owner_sec; |
10be1b6a DK |
459 | if (syms[n].def != LDPK_UNDEF) |
460 | blhe = bfd_link_hash_lookup (link_info.hash, syms[n].name, | |
461 | FALSE, FALSE, TRUE); | |
462 | else | |
463 | blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, &link_info, | |
464 | syms[n].name, FALSE, FALSE, TRUE); | |
5d3236ee DK |
465 | if (!blhe) |
466 | { | |
467 | syms[n].resolution = LDPR_UNKNOWN; | |
1715a13c | 468 | goto report_symbol; |
5d3236ee DK |
469 | } |
470 | ||
471 | /* Determine resolution from blhe type and symbol's original type. */ | |
472 | if (blhe->type == bfd_link_hash_undefined | |
f84854b6 | 473 | || blhe->type == bfd_link_hash_undefweak) |
5d3236ee DK |
474 | { |
475 | syms[n].resolution = LDPR_UNDEF; | |
1715a13c | 476 | goto report_symbol; |
5d3236ee DK |
477 | } |
478 | if (blhe->type != bfd_link_hash_defined | |
f84854b6 L |
479 | && blhe->type != bfd_link_hash_defweak |
480 | && blhe->type != bfd_link_hash_common) | |
5d3236ee DK |
481 | { |
482 | /* We should not have a new, indirect or warning symbol here. */ | |
ea360572 | 483 | einfo ("%P%F: %s: plugin symbol table corrupt (sym type %d)\n", |
f84854b6 | 484 | called_plugin->name, blhe->type); |
5d3236ee DK |
485 | } |
486 | ||
42a851a9 DK |
487 | /* Find out which section owns the symbol. Since it's not undef, |
488 | it must have an owner; if it's not a common symbol, both defs | |
489 | and weakdefs keep it in the same place. */ | |
490 | owner_sec = (blhe->type == bfd_link_hash_common) | |
f84854b6 L |
491 | ? blhe->u.c.p->section |
492 | : blhe->u.def.section; | |
42a851a9 DK |
493 | |
494 | /* We need to know if the sym is referenced from non-IR files. Or | |
f84854b6 | 495 | even potentially-referenced, perhaps in a future final link if |
42a851a9 DK |
496 | this is a partial one, perhaps dynamically at load-time if the |
497 | symbol is externally visible. */ | |
8ff09c12 L |
498 | ironly = (!is_visible_from_outside (&syms[n], owner_sec, blhe) |
499 | && !bfd_hash_lookup (non_ironly_hash, syms[n].name, | |
174b85fc | 500 | FALSE, FALSE)); |
5d3236ee DK |
501 | |
502 | /* If it was originally undefined or common, then it has been | |
f84854b6 L |
503 | resolved; determine how. */ |
504 | if (syms[n].def == LDPK_UNDEF | |
505 | || syms[n].def == LDPK_WEAKUNDEF | |
5d3236ee DK |
506 | || syms[n].def == LDPK_COMMON) |
507 | { | |
5d3236ee DK |
508 | if (owner_sec->owner == link_info.output_bfd) |
509 | syms[n].resolution = LDPR_RESOLVED_EXEC; | |
510 | else if (owner_sec->owner == abfd) | |
f84854b6 L |
511 | syms[n].resolution = (ironly |
512 | ? LDPR_PREVAILING_DEF_IRONLY | |
513 | : LDPR_PREVAILING_DEF); | |
5d3236ee DK |
514 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
515 | syms[n].resolution = LDPR_RESOLVED_IR; | |
cc322803 L |
516 | else if (owner_sec->owner != NULL |
517 | && (owner_sec->owner->flags & DYNAMIC) != 0) | |
5d3236ee DK |
518 | syms[n].resolution = LDPR_RESOLVED_DYN; |
519 | else | |
520 | syms[n].resolution = LDPR_RESOLVED_EXEC; | |
1715a13c | 521 | goto report_symbol; |
5d3236ee DK |
522 | } |
523 | ||
524 | /* Was originally def, or weakdef. Does it prevail? If the | |
f84854b6 | 525 | owner is the original dummy bfd that supplied it, then this |
5d3236ee | 526 | is the definition that has prevailed. */ |
42a851a9 | 527 | if (owner_sec->owner == link_info.output_bfd) |
5d3236ee | 528 | syms[n].resolution = LDPR_PREEMPTED_REG; |
42a851a9 | 529 | else if (owner_sec->owner == abfd) |
5d3236ee | 530 | { |
f84854b6 | 531 | syms[n].resolution = (ironly |
5d3236ee | 532 | ? LDPR_PREVAILING_DEF_IRONLY |
f84854b6 | 533 | : LDPR_PREVAILING_DEF); |
1715a13c | 534 | goto report_symbol; |
5d3236ee DK |
535 | } |
536 | ||
537 | /* Was originally def, weakdef, or common, but has been pre-empted. */ | |
1715a13c L |
538 | syms[n].resolution = (is_ir_dummy_bfd (owner_sec->owner) |
539 | ? LDPR_PREEMPTED_IR | |
540 | : LDPR_PREEMPTED_REG); | |
541 | ||
542 | report_symbol: | |
543 | if (report_plugin_symbols) | |
544 | einfo ("%P: %B: symbol `%s' definition: %d, resolution: %d\n", | |
545 | abfd, syms[n].name, syms[n].def, syms[n].resolution); | |
5d3236ee DK |
546 | } |
547 | return LDPS_OK; | |
548 | } | |
549 | ||
550 | /* Add a new (real) input file generated by a plugin. */ | |
551 | static enum ld_plugin_status | |
552 | add_input_file (const char *pathname) | |
553 | { | |
554 | ASSERT (called_plugin); | |
d4cb7acd | 555 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_file_enum, |
f84854b6 | 556 | NULL)) |
5d3236ee DK |
557 | return LDPS_ERR; |
558 | return LDPS_OK; | |
559 | } | |
560 | ||
561 | /* Add a new (real) library required by a plugin. */ | |
562 | static enum ld_plugin_status | |
563 | add_input_library (const char *pathname) | |
564 | { | |
565 | ASSERT (called_plugin); | |
d4cb7acd | 566 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_l_enum, |
f84854b6 | 567 | NULL)) |
5d3236ee DK |
568 | return LDPS_ERR; |
569 | return LDPS_OK; | |
570 | } | |
571 | ||
572 | /* Set the extra library path to be used by libraries added via | |
573 | add_input_library. */ | |
574 | static enum ld_plugin_status | |
575 | set_extra_library_path (const char *path) | |
576 | { | |
577 | ASSERT (called_plugin); | |
d4cb7acd | 578 | ldfile_add_library_path (xstrdup (path), FALSE); |
5d3236ee DK |
579 | return LDPS_OK; |
580 | } | |
581 | ||
582 | /* Issue a diagnostic message from a plugin. */ | |
583 | static enum ld_plugin_status | |
584 | message (int level, const char *format, ...) | |
585 | { | |
586 | va_list args; | |
587 | va_start (args, format); | |
588 | ||
589 | switch (level) | |
590 | { | |
591 | case LDPL_INFO: | |
592 | vfinfo (stdout, format, args, FALSE); | |
d251c5c4 | 593 | putchar ('\n'); |
5d3236ee DK |
594 | break; |
595 | case LDPL_WARNING: | |
596 | vfinfo (stdout, format, args, TRUE); | |
d251c5c4 | 597 | putchar ('\n'); |
5d3236ee DK |
598 | break; |
599 | case LDPL_FATAL: | |
600 | case LDPL_ERROR: | |
601 | default: | |
f84854b6 | 602 | { |
7990daec L |
603 | char *newfmt = ACONCAT ((level == LDPL_FATAL |
604 | ? "%P%F: " : "%P%X: ", | |
b7f42144 | 605 | format, "\n", NULL)); |
e922bcab | 606 | fflush (stdout); |
f84854b6 | 607 | vfinfo (stderr, newfmt, args, TRUE); |
e922bcab | 608 | fflush (stderr); |
f84854b6 | 609 | } |
5d3236ee DK |
610 | break; |
611 | } | |
612 | ||
613 | va_end (args); | |
614 | return LDPS_OK; | |
615 | } | |
616 | ||
617 | /* Helper to size leading part of tv array and set it up. */ | |
618 | static size_t | |
619 | set_tv_header (struct ld_plugin_tv *tv) | |
620 | { | |
621 | size_t i; | |
622 | ||
623 | /* Version info. */ | |
624 | static const unsigned int major = (unsigned)(BFD_VERSION / 100000000UL); | |
625 | static const unsigned int minor = (unsigned)(BFD_VERSION / 1000000UL) % 100; | |
626 | ||
627 | if (!tv) | |
628 | return tv_header_size; | |
629 | ||
630 | for (i = 0; i < tv_header_size; i++) | |
631 | { | |
632 | tv[i].tv_tag = tv_header_tags[i]; | |
633 | #define TVU(x) tv[i].tv_u.tv_ ## x | |
634 | switch (tv[i].tv_tag) | |
635 | { | |
f84854b6 L |
636 | case LDPT_MESSAGE: |
637 | TVU(message) = message; | |
638 | break; | |
639 | case LDPT_API_VERSION: | |
640 | TVU(val) = LD_PLUGIN_API_VERSION; | |
641 | break; | |
642 | case LDPT_GNU_LD_VERSION: | |
643 | TVU(val) = major * 100 + minor; | |
644 | break; | |
645 | case LDPT_LINKER_OUTPUT: | |
646 | TVU(val) = (link_info.relocatable | |
647 | ? LDPO_REL | |
648 | : (link_info.shared ? LDPO_DYN : LDPO_EXEC)); | |
649 | break; | |
650 | case LDPT_OUTPUT_NAME: | |
651 | TVU(string) = output_filename; | |
652 | break; | |
653 | case LDPT_REGISTER_CLAIM_FILE_HOOK: | |
654 | TVU(register_claim_file) = register_claim_file; | |
655 | break; | |
656 | case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: | |
657 | TVU(register_all_symbols_read) = register_all_symbols_read; | |
658 | break; | |
659 | case LDPT_REGISTER_CLEANUP_HOOK: | |
660 | TVU(register_cleanup) = register_cleanup; | |
661 | break; | |
662 | case LDPT_ADD_SYMBOLS: | |
663 | TVU(add_symbols) = add_symbols; | |
664 | break; | |
665 | case LDPT_GET_INPUT_FILE: | |
666 | TVU(get_input_file) = get_input_file; | |
667 | break; | |
668 | case LDPT_RELEASE_INPUT_FILE: | |
669 | TVU(release_input_file) = release_input_file; | |
670 | break; | |
671 | case LDPT_GET_SYMBOLS: | |
672 | TVU(get_symbols) = get_symbols; | |
673 | break; | |
674 | case LDPT_ADD_INPUT_FILE: | |
675 | TVU(add_input_file) = add_input_file; | |
676 | break; | |
677 | case LDPT_ADD_INPUT_LIBRARY: | |
678 | TVU(add_input_library) = add_input_library; | |
679 | break; | |
680 | case LDPT_SET_EXTRA_LIBRARY_PATH: | |
681 | TVU(set_extra_library_path) = set_extra_library_path; | |
682 | break; | |
683 | default: | |
684 | /* Added a new entry to the array without adding | |
685 | a new case to set up its value is a bug. */ | |
686 | FAIL (); | |
5d3236ee DK |
687 | } |
688 | #undef TVU | |
689 | } | |
690 | return tv_header_size; | |
691 | } | |
692 | ||
693 | /* Append the per-plugin args list and trailing LDPT_NULL to tv. */ | |
694 | static void | |
695 | set_tv_plugin_args (plugin_t *plugin, struct ld_plugin_tv *tv) | |
696 | { | |
697 | plugin_arg_t *arg = plugin->args; | |
698 | while (arg) | |
699 | { | |
700 | tv->tv_tag = LDPT_OPTION; | |
701 | tv->tv_u.tv_string = arg->arg; | |
702 | arg = arg->next; | |
703 | tv++; | |
704 | } | |
705 | tv->tv_tag = LDPT_NULL; | |
706 | tv->tv_u.tv_val = 0; | |
707 | } | |
708 | ||
d44ad554 DK |
709 | /* Return true if any plugins are active this run. Only valid |
710 | after options have been processed. */ | |
711 | bfd_boolean | |
712 | plugin_active_plugins_p (void) | |
713 | { | |
714 | return plugins_list != NULL; | |
715 | } | |
716 | ||
5d3236ee | 717 | /* Load up and initialise all plugins after argument parsing. */ |
d44ad554 DK |
718 | int |
719 | plugin_load_plugins (void) | |
5d3236ee DK |
720 | { |
721 | struct ld_plugin_tv *my_tv; | |
722 | unsigned int max_args = 0; | |
723 | plugin_t *curplug = plugins_list; | |
724 | ||
725 | /* If there are no plugins, we need do nothing this run. */ | |
726 | if (!curplug) | |
727 | return 0; | |
728 | ||
729 | /* First pass over plugins to find max # args needed so that we | |
730 | can size and allocate the tv array. */ | |
731 | while (curplug) | |
732 | { | |
733 | if (curplug->n_args > max_args) | |
734 | max_args = curplug->n_args; | |
735 | curplug = curplug->next; | |
736 | } | |
737 | ||
738 | /* Allocate tv array and initialise constant part. */ | |
739 | my_tv = xmalloc ((max_args + 1 + tv_header_size) * sizeof *my_tv); | |
740 | set_tv_header (my_tv); | |
741 | ||
742 | /* Pass over plugins again, activating them. */ | |
743 | curplug = plugins_list; | |
744 | while (curplug) | |
745 | { | |
746 | enum ld_plugin_status rv; | |
747 | ld_plugin_onload onloadfn = dlsym (curplug->dlhandle, "onload"); | |
748 | if (!onloadfn) | |
749 | onloadfn = dlsym (curplug->dlhandle, "_onload"); | |
750 | if (!onloadfn) | |
f84854b6 | 751 | return set_plugin_error (curplug->name); |
5d3236ee DK |
752 | set_tv_plugin_args (curplug, &my_tv[tv_header_size]); |
753 | called_plugin = curplug; | |
754 | rv = (*onloadfn) (my_tv); | |
755 | called_plugin = NULL; | |
756 | if (rv != LDPS_OK) | |
f84854b6 | 757 | return set_plugin_error (curplug->name); |
5d3236ee DK |
758 | curplug = curplug->next; |
759 | } | |
760 | ||
761 | /* Since plugin(s) inited ok, assume they're going to want symbol | |
762 | resolutions, which needs us to track which symbols are referenced | |
763 | by non-IR files using the linker's notice callback. */ | |
764 | link_info.notice_all = TRUE; | |
765 | ||
766 | return 0; | |
767 | } | |
768 | ||
769 | /* Call 'claim file' hook for all plugins. */ | |
770 | int | |
771 | plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed) | |
772 | { | |
773 | plugin_t *curplug = plugins_list; | |
774 | *claimed = FALSE; | |
775 | if (no_more_claiming) | |
776 | return 0; | |
777 | while (curplug && !*claimed) | |
778 | { | |
779 | if (curplug->claim_file_handler) | |
780 | { | |
781 | enum ld_plugin_status rv; | |
782 | called_plugin = curplug; | |
783 | rv = (*curplug->claim_file_handler) (file, claimed); | |
784 | called_plugin = NULL; | |
785 | if (rv != LDPS_OK) | |
786 | set_plugin_error (curplug->name); | |
787 | } | |
788 | curplug = curplug->next; | |
789 | } | |
790 | return plugin_error_p () ? -1 : 0; | |
791 | } | |
792 | ||
793 | /* Call 'all symbols read' hook for all plugins. */ | |
794 | int | |
795 | plugin_call_all_symbols_read (void) | |
796 | { | |
797 | plugin_t *curplug = plugins_list; | |
798 | ||
799 | /* Disable any further file-claiming. */ | |
800 | no_more_claiming = TRUE; | |
801 | ||
802 | /* If --allow-multiple-definition is in effect, we need to disable it, | |
803 | as the plugin infrastructure relies on the multiple_definition | |
804 | callback to swap out the dummy IR-only BFDs for new real ones | |
805 | when it starts opening the files added during this callback. */ | |
806 | plugin_cached_allow_multiple_defs = link_info.allow_multiple_definition; | |
807 | link_info.allow_multiple_definition = FALSE; | |
808 | ||
809 | while (curplug) | |
810 | { | |
811 | if (curplug->all_symbols_read_handler) | |
812 | { | |
813 | enum ld_plugin_status rv; | |
814 | called_plugin = curplug; | |
815 | rv = (*curplug->all_symbols_read_handler) (); | |
816 | called_plugin = NULL; | |
817 | if (rv != LDPS_OK) | |
818 | set_plugin_error (curplug->name); | |
819 | } | |
820 | curplug = curplug->next; | |
821 | } | |
822 | return plugin_error_p () ? -1 : 0; | |
823 | } | |
824 | ||
e73d965c | 825 | /* Call 'cleanup' hook for all plugins at exit. */ |
498cd2a0 | 826 | void |
5d3236ee DK |
827 | plugin_call_cleanup (void) |
828 | { | |
829 | plugin_t *curplug = plugins_list; | |
830 | while (curplug) | |
831 | { | |
832 | if (curplug->cleanup_handler && !curplug->cleanup_done) | |
833 | { | |
834 | enum ld_plugin_status rv; | |
835 | curplug->cleanup_done = TRUE; | |
836 | called_plugin = curplug; | |
837 | rv = (*curplug->cleanup_handler) (); | |
838 | called_plugin = NULL; | |
839 | if (rv != LDPS_OK) | |
840 | set_plugin_error (curplug->name); | |
841 | dlclose (curplug->dlhandle); | |
842 | } | |
843 | curplug = curplug->next; | |
844 | } | |
e73d965c L |
845 | if (plugin_error_p ()) |
846 | info_msg (_("%P: %s: error in plugin cleanup (ignored)\n"), | |
847 | plugin_error_plugin ()); | |
5d3236ee DK |
848 | } |
849 | ||
850 | /* Lazily init the non_ironly hash table. */ | |
851 | static void | |
852 | init_non_ironly_hash (void) | |
853 | { | |
174b85fc L |
854 | struct bfd_sym_chain *sym; |
855 | ||
5d3236ee DK |
856 | if (non_ironly_hash == NULL) |
857 | { | |
858 | non_ironly_hash = | |
f84854b6 | 859 | (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table)); |
5d3236ee DK |
860 | if (!bfd_hash_table_init_n (non_ironly_hash, |
861 | bfd_hash_newfunc, | |
862 | sizeof (struct bfd_hash_entry), | |
863 | 61)) | |
864 | einfo (_("%P%F: bfd_hash_table_init failed: %E\n")); | |
174b85fc L |
865 | |
866 | for (sym = &entry_symbol; sym != NULL; sym = sym->next) | |
867 | if (sym->name | |
868 | && !bfd_hash_lookup (non_ironly_hash, sym->name, TRUE, TRUE)) | |
869 | einfo (_("%P%X: hash table failure adding symbol %s\n"), | |
870 | sym->name); | |
5d3236ee DK |
871 | } |
872 | } | |
873 | ||
874 | /* To determine which symbols should be resolved LDPR_PREVAILING_DEF | |
875 | and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as | |
876 | the linker adds them to the linker hash table. If we see a symbol | |
877 | being referenced from a non-IR file, we add it to the non_ironly hash | |
878 | table. If we can't find it there at get_symbols time, we know that | |
879 | it was referenced only by IR files. We have to notice_all symbols, | |
880 | because we won't necessarily know until later which ones will be | |
881 | contributed by IR files. */ | |
882 | bfd_boolean | |
883 | plugin_notice (struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
f84854b6 L |
884 | const char *name, bfd *abfd, |
885 | asection *section, bfd_vma value ATTRIBUTE_UNUSED) | |
5d3236ee DK |
886 | { |
887 | bfd_boolean is_ref = bfd_is_und_section (section); | |
888 | bfd_boolean is_dummy = is_ir_dummy_bfd (abfd); | |
889 | init_non_ironly_hash (); | |
890 | /* We only care about refs, not defs, indicated by section pointing | |
891 | to the undefined section (according to the bfd linker notice callback | |
892 | interface definition). */ | |
893 | if (is_ref && !is_dummy) | |
894 | { | |
895 | /* This is a ref from a non-IR file, so note the ref'd symbol | |
f84854b6 | 896 | in the non-IR-only hash. */ |
5d3236ee | 897 | if (!bfd_hash_lookup (non_ironly_hash, name, TRUE, TRUE)) |
ea360572 | 898 | einfo (_("%P%X: %s: hash table failure adding symbol %s\n"), |
f84854b6 | 899 | abfd->filename, name); |
5d3236ee DK |
900 | } |
901 | else if (!is_ref && is_dummy) | |
902 | { | |
903 | /* No further processing since this is a def from an IR dummy BFD. */ | |
904 | return FALSE; | |
905 | } | |
906 | ||
907 | /* Continue with cref/nocrossref/trace-sym processing. */ | |
908 | return TRUE; | |
909 | } | |
910 | ||
911 | /* When we add new object files to the link at all symbols read time, | |
912 | these contain the real code and symbols generated from the IR files, | |
913 | and so duplicate all the definitions already supplied by the dummy | |
914 | IR-only BFDs that we created at claim files time. We use the linker's | |
915 | multiple-definitions callback hook to fix up the clash, discarding | |
916 | the symbol from the IR-only BFD in favour of the symbol from the | |
917 | real BFD. We return true if this was not-really-a-clash because | |
918 | we've fixed it up, or anyway if --allow-multiple-definition was in | |
919 | effect (before we disabled it to ensure we got called back). */ | |
920 | bfd_boolean | |
921 | plugin_multiple_definition (struct bfd_link_info *info, const char *name, | |
f84854b6 L |
922 | bfd *obfd, asection *osec ATTRIBUTE_UNUSED, |
923 | bfd_vma oval ATTRIBUTE_UNUSED, | |
924 | bfd *nbfd, asection *nsec, bfd_vma nval) | |
5d3236ee DK |
925 | { |
926 | if (is_ir_dummy_bfd (obfd)) | |
927 | { | |
f84854b6 L |
928 | struct bfd_link_hash_entry *blhe |
929 | = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, FALSE); | |
5d3236ee | 930 | if (!blhe) |
ea360572 | 931 | einfo (_("%P%X: %s: can't find IR symbol '%s'\n"), nbfd->filename, |
f84854b6 | 932 | name); |
5d3236ee | 933 | else if (blhe->type != bfd_link_hash_defined) |
ea360572 | 934 | einfo (_("%P%x: %s: bad IR symbol type %d\n"), name, blhe->type); |
5d3236ee DK |
935 | /* Replace it with new details. */ |
936 | blhe->u.def.section = nsec; | |
937 | blhe->u.def.value = nval; | |
938 | return TRUE; | |
939 | } | |
940 | return plugin_cached_allow_multiple_defs; | |
941 | } |