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5d3236ee DK |
1 | /* Plugin control for the GNU linker. |
2 | Copyright 2010 Free Software Foundation, Inc. | |
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 DK |
38 | |
39 | /* The suffix to append to the name of the real (claimed) object file | |
40 | when generating a dummy BFD to hold the IR symbols sent from the | |
41 | plugin. */ | |
42 | #define IRONLY_SUFFIX ".ironly\004" | |
43 | ||
44 | /* This is sizeof an array of chars, not sizeof a const char *. We | |
45 | also have to avoid inadvertently counting the trailing NUL. */ | |
46 | #define IRONLY_SUFFIX_LEN (sizeof (IRONLY_SUFFIX) - 1) | |
47 | ||
48 | /* Stores a single argument passed to a plugin. */ | |
49 | typedef struct plugin_arg | |
50 | { | |
51 | struct plugin_arg *next; | |
52 | const char *arg; | |
53 | } plugin_arg_t; | |
54 | ||
55 | /* Holds all details of a single plugin. */ | |
56 | typedef struct plugin | |
57 | { | |
58 | /* Next on the list of plugins, or NULL at end of chain. */ | |
59 | struct plugin *next; | |
60 | /* The argument string given to --plugin. */ | |
61 | const char *name; | |
62 | /* The shared library handle returned by dlopen. */ | |
63 | void *dlhandle; | |
64 | /* The list of argument string given to --plugin-opt. */ | |
65 | plugin_arg_t *args; | |
66 | /* Number of args in the list, for convenience. */ | |
67 | size_t n_args; | |
68 | /* The plugin's event handlers. */ | |
69 | ld_plugin_claim_file_handler claim_file_handler; | |
70 | ld_plugin_all_symbols_read_handler all_symbols_read_handler; | |
71 | ld_plugin_cleanup_handler cleanup_handler; | |
72 | /* TRUE if the cleanup handlers have been called. */ | |
73 | bfd_boolean cleanup_done; | |
74 | } plugin_t; | |
75 | ||
76 | /* The master list of all plugins. */ | |
77 | static plugin_t *plugins_list = NULL; | |
78 | ||
79 | /* We keep a tail pointer for easy linking on the end. */ | |
80 | static plugin_t **plugins_tail_chain_ptr = &plugins_list; | |
81 | ||
82 | /* The last plugin added to the list, for receiving args. */ | |
83 | static plugin_t *last_plugin = NULL; | |
84 | ||
85 | /* The tail of the arg chain of the last plugin added to the list. */ | |
86 | static plugin_arg_t **last_plugin_args_tail_chain_ptr = NULL; | |
87 | ||
88 | /* The plugin which is currently having a callback executed. */ | |
89 | static plugin_t *called_plugin = NULL; | |
90 | ||
91 | /* Last plugin to cause an error, if any. */ | |
92 | static const char *error_plugin = NULL; | |
93 | ||
94 | /* A hash table that records symbols referenced by non-IR files. Used | |
95 | at get_symbols time to determine whether any prevailing defs from | |
96 | IR files are referenced only from other IR files, so tthat we can | |
97 | we can distinguish the LDPR_PREVAILING_DEF and LDPR_PREVAILING_DEF_IRONLY | |
98 | cases when establishing symbol resolutions. */ | |
99 | static struct bfd_hash_table *non_ironly_hash = NULL; | |
100 | ||
101 | /* Set at all symbols read time, to avoid recursively offering the plugin | |
102 | its own newly-added input files and libs to claim. */ | |
103 | static bfd_boolean no_more_claiming = FALSE; | |
104 | ||
105 | /* If the --allow-multiple-definition command-line option is active, we | |
106 | have to disable it so that BFD always calls our hook, and simulate the | |
107 | effect (when not resolving IR vs. real symbols) ourselves by ensuring | |
108 | TRUE is returned from the hook. */ | |
109 | static bfd_boolean plugin_cached_allow_multiple_defs = FALSE; | |
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 | ||
3917d5d5 DK |
134 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
135 | ||
136 | #define RTLD_NOW 0 /* Dummy value. */ | |
137 | ||
138 | static void * | |
139 | dlopen (const char *file, int mode ATTRIBUTE_UNUSED) | |
140 | { | |
141 | return LoadLibrary (file); | |
142 | } | |
143 | ||
144 | static void * | |
145 | dlsym (void *handle, const char *name) | |
146 | { | |
147 | return GetProcAddress (handle, name); | |
148 | } | |
149 | ||
150 | static int | |
151 | dlclose (void *handle) | |
152 | { | |
153 | FreeLibrary (handle); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */ | |
158 | ||
5d3236ee DK |
159 | /* Helper function for exiting with error status. */ |
160 | static int | |
161 | set_plugin_error (const char *plugin) | |
162 | { | |
163 | error_plugin = plugin; | |
164 | return -1; | |
165 | } | |
166 | ||
167 | /* Test if an error occurred. */ | |
168 | static bfd_boolean | |
169 | plugin_error_p (void) | |
170 | { | |
171 | return error_plugin != NULL; | |
172 | } | |
173 | ||
174 | /* Return name of plugin which caused an error if any. */ | |
d44ad554 DK |
175 | const char * |
176 | plugin_error_plugin (void) | |
5d3236ee DK |
177 | { |
178 | return error_plugin ? error_plugin : _("<no plugin>"); | |
179 | } | |
180 | ||
181 | /* Handle -plugin arg: find and load plugin, or return error. */ | |
d44ad554 DK |
182 | int |
183 | plugin_opt_plugin (const char *plugin) | |
5d3236ee DK |
184 | { |
185 | plugin_t *newplug; | |
186 | ||
187 | newplug = xmalloc (sizeof *newplug); | |
188 | memset (newplug, 0, sizeof *newplug); | |
189 | newplug->name = plugin; | |
190 | newplug->dlhandle = dlopen (plugin, RTLD_NOW); | |
191 | if (!newplug->dlhandle) | |
192 | return set_plugin_error (plugin); | |
193 | ||
194 | /* Chain on end, so when we run list it is in command-line order. */ | |
195 | *plugins_tail_chain_ptr = newplug; | |
196 | plugins_tail_chain_ptr = &newplug->next; | |
197 | ||
198 | /* Record it as current plugin for receiving args. */ | |
199 | last_plugin = newplug; | |
200 | last_plugin_args_tail_chain_ptr = &newplug->args; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | /* Accumulate option arguments for last-loaded plugin, or return | |
205 | error if none. */ | |
d44ad554 DK |
206 | int |
207 | plugin_opt_plugin_arg (const char *arg) | |
5d3236ee DK |
208 | { |
209 | plugin_arg_t *newarg; | |
210 | ||
211 | if (!last_plugin) | |
212 | return set_plugin_error (_("<no plugin>")); | |
213 | ||
214 | newarg = xmalloc (sizeof *newarg); | |
215 | newarg->arg = arg; | |
216 | newarg->next = NULL; | |
217 | ||
218 | /* Chain on end to preserve command-line order. */ | |
219 | *last_plugin_args_tail_chain_ptr = newarg; | |
220 | last_plugin_args_tail_chain_ptr = &newarg->next; | |
221 | last_plugin->n_args++; | |
222 | return 0; | |
223 | } | |
224 | ||
225 | /* Create a dummy BFD. */ | |
226 | bfd * | |
227 | plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate) | |
228 | { | |
229 | asection *sec; | |
bc110b6e AM |
230 | bfd *abfd; |
231 | ||
232 | bfd_use_reserved_id = 1; | |
233 | abfd = bfd_create (concat (name, IRONLY_SUFFIX, (const char *)NULL), | |
234 | srctemplate); | |
5d3236ee DK |
235 | bfd_set_arch_info (abfd, bfd_get_arch_info (srctemplate)); |
236 | bfd_make_writable (abfd); | |
237 | /* Create a minimal set of sections to own the symbols. */ | |
238 | sec = bfd_make_section_old_way (abfd, ".text"); | |
239 | bfd_set_section_flags (abfd, sec, | |
bc110b6e AM |
240 | (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY |
241 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP)); | |
5d3236ee DK |
242 | sec->output_section = sec; |
243 | sec->output_offset = 0; | |
244 | return abfd; | |
245 | } | |
246 | ||
d44ad554 DK |
247 | /* Check if the BFD passed in is an IR dummy object file. */ |
248 | static bfd_boolean | |
5d3236ee DK |
249 | is_ir_dummy_bfd (const bfd *abfd) |
250 | { | |
129b5d55 AM |
251 | size_t namlen; |
252 | ||
253 | if (abfd == NULL) | |
254 | return FALSE; | |
255 | namlen = strlen (abfd->filename); | |
5d3236ee DK |
256 | if (namlen < IRONLY_SUFFIX_LEN) |
257 | return FALSE; | |
258 | return !strcmp (abfd->filename + namlen - IRONLY_SUFFIX_LEN, IRONLY_SUFFIX); | |
259 | } | |
260 | ||
261 | /* Helpers to convert between BFD and GOLD symbol formats. */ | |
262 | static enum ld_plugin_status | |
263 | asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, | |
264 | const struct ld_plugin_symbol *ldsym) | |
265 | { | |
266 | flagword flags = BSF_NO_FLAGS; | |
267 | struct bfd_section *section; | |
268 | ||
269 | asym->the_bfd = abfd; | |
270 | asym->name = ldsym->version | |
271 | ? concat (ldsym->name, "@", ldsym->version, NULL) | |
272 | : ldsym->name; | |
273 | asym->value = 0; | |
274 | switch (ldsym->def) | |
275 | { | |
276 | case LDPK_WEAKDEF: | |
277 | flags = BSF_WEAK; | |
278 | /* FALLTHRU */ | |
279 | case LDPK_DEF: | |
280 | flags |= BSF_GLOBAL; | |
281 | section = bfd_get_section_by_name (abfd, ".text"); | |
282 | break; | |
283 | ||
284 | case LDPK_WEAKUNDEF: | |
285 | flags = BSF_WEAK; | |
286 | /* FALLTHRU */ | |
287 | case LDPK_UNDEF: | |
288 | section = bfd_und_section_ptr; | |
289 | break; | |
290 | ||
291 | case LDPK_COMMON: | |
292 | flags = BSF_GLOBAL; | |
293 | section = bfd_com_section_ptr; | |
294 | asym->value = ldsym->size; | |
295 | break; | |
296 | ||
297 | default: | |
298 | return LDPS_ERR; | |
299 | } | |
300 | asym->flags = flags; | |
301 | asym->section = section; | |
302 | ||
303 | /* Visibility only applies on ELF targets. */ | |
304 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
305 | { | |
306 | elf_symbol_type *elfsym = elf_symbol_from (abfd, asym); | |
307 | if (!elfsym) | |
308 | einfo (_("%P%F: %s: non-ELF symbol in ELF BFD!"), asym->name); | |
309 | elfsym->internal_elf_sym.st_other &= ~3; | |
310 | elfsym->internal_elf_sym.st_other |= ldsym->visibility; | |
311 | } | |
312 | ||
313 | return LDPS_OK; | |
314 | } | |
315 | ||
316 | /* Register a claim-file handler. */ | |
317 | static enum ld_plugin_status | |
318 | register_claim_file (ld_plugin_claim_file_handler handler) | |
319 | { | |
320 | ASSERT (called_plugin); | |
321 | called_plugin->claim_file_handler = handler; | |
322 | return LDPS_OK; | |
323 | } | |
324 | ||
325 | /* Register an all-symbols-read handler. */ | |
326 | static enum ld_plugin_status | |
327 | register_all_symbols_read (ld_plugin_all_symbols_read_handler handler) | |
328 | { | |
329 | ASSERT (called_plugin); | |
330 | called_plugin->all_symbols_read_handler = handler; | |
331 | return LDPS_OK; | |
332 | } | |
333 | ||
334 | /* Register a cleanup handler. */ | |
335 | static enum ld_plugin_status | |
336 | register_cleanup (ld_plugin_cleanup_handler handler) | |
337 | { | |
338 | ASSERT (called_plugin); | |
339 | called_plugin->cleanup_handler = handler; | |
340 | return LDPS_OK; | |
341 | } | |
342 | ||
343 | /* Add symbols from a plugin-claimed input file. */ | |
344 | static enum ld_plugin_status | |
345 | add_symbols (void *handle, int nsyms, const struct ld_plugin_symbol *syms) | |
346 | { | |
347 | asymbol **symptrs; | |
348 | bfd *abfd = handle; | |
349 | int n; | |
350 | ASSERT (called_plugin); | |
351 | symptrs = xmalloc (nsyms * sizeof *symptrs); | |
352 | for (n = 0; n < nsyms; n++) | |
353 | { | |
354 | enum ld_plugin_status rv; | |
355 | asymbol *bfdsym = bfd_make_empty_symbol (abfd); | |
356 | symptrs[n] = bfdsym; | |
357 | rv = asymbol_from_plugin_symbol (abfd, bfdsym, syms + n); | |
358 | if (rv != LDPS_OK) | |
359 | return rv; | |
360 | } | |
361 | bfd_set_symtab (abfd, symptrs, nsyms); | |
362 | return LDPS_OK; | |
363 | } | |
364 | ||
365 | /* Get the input file information with an open (possibly re-opened) | |
366 | file descriptor. */ | |
367 | static enum ld_plugin_status | |
368 | get_input_file (const void *handle, struct ld_plugin_input_file *file) | |
369 | { | |
370 | ASSERT (called_plugin); | |
371 | handle = handle; | |
372 | file = file; | |
373 | return LDPS_ERR; | |
374 | } | |
375 | ||
376 | /* Release the input file. */ | |
377 | static enum ld_plugin_status | |
378 | release_input_file (const void *handle) | |
379 | { | |
380 | ASSERT (called_plugin); | |
381 | handle = handle; | |
382 | return LDPS_ERR; | |
383 | } | |
384 | ||
385 | /* Get the symbol resolution info for a plugin-claimed input file. */ | |
386 | static enum ld_plugin_status | |
387 | get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
388 | { | |
389 | const bfd *abfd = handle; | |
390 | int n; | |
391 | ASSERT (called_plugin); | |
392 | for (n = 0; n < nsyms; n++) | |
393 | { | |
394 | struct bfd_link_hash_entry *blhe; | |
395 | bfd_boolean ironly; | |
396 | ||
397 | blhe = bfd_link_hash_lookup (link_info.hash, syms[n].name, | |
398 | FALSE, FALSE, TRUE); | |
399 | if (!blhe) | |
400 | { | |
401 | syms[n].resolution = LDPR_UNKNOWN; | |
402 | continue; | |
403 | } | |
404 | ||
405 | /* Determine resolution from blhe type and symbol's original type. */ | |
406 | if (blhe->type == bfd_link_hash_undefined | |
407 | || blhe->type == bfd_link_hash_undefweak) | |
408 | { | |
409 | syms[n].resolution = LDPR_UNDEF; | |
410 | continue; | |
411 | } | |
412 | if (blhe->type != bfd_link_hash_defined | |
413 | && blhe->type != bfd_link_hash_defweak | |
414 | && blhe->type != bfd_link_hash_common) | |
415 | { | |
416 | /* We should not have a new, indirect or warning symbol here. */ | |
417 | einfo ("%P%F: %s: plugin symbol table corrupt (sym type %d)", | |
418 | called_plugin->name, blhe->type); | |
419 | } | |
420 | ||
421 | /* We need to know if the sym is referenced from non-IR files. */ | |
422 | ironly = !bfd_hash_lookup (non_ironly_hash, syms[n].name, FALSE, FALSE); | |
423 | ||
424 | /* If it was originally undefined or common, then it has been | |
425 | resolved; determine how. */ | |
426 | if (syms[n].def == LDPK_UNDEF || syms[n].def == LDPK_WEAKUNDEF | |
427 | || syms[n].def == LDPK_COMMON) | |
428 | { | |
7bac81d3 | 429 | asection *owner_sec = (blhe->type == bfd_link_hash_common) |
5d3236ee DK |
430 | ? blhe->u.c.p->section |
431 | : blhe->u.def.section; | |
432 | if (owner_sec->owner == link_info.output_bfd) | |
433 | syms[n].resolution = LDPR_RESOLVED_EXEC; | |
434 | else if (owner_sec->owner == abfd) | |
435 | syms[n].resolution = (ironly) | |
436 | ? LDPR_PREVAILING_DEF_IRONLY | |
437 | : LDPR_PREVAILING_DEF; | |
438 | else if (is_ir_dummy_bfd (owner_sec->owner)) | |
439 | syms[n].resolution = LDPR_RESOLVED_IR; | |
440 | else if (owner_sec->owner->flags & DYNAMIC) | |
441 | syms[n].resolution = LDPR_RESOLVED_DYN; | |
442 | else | |
443 | syms[n].resolution = LDPR_RESOLVED_EXEC; | |
444 | continue; | |
445 | } | |
446 | ||
447 | /* Was originally def, or weakdef. Does it prevail? If the | |
448 | owner is the original dummy bfd that supplied it, then this | |
449 | is the definition that has prevailed. */ | |
450 | if (blhe->u.def.section->owner == link_info.output_bfd) | |
451 | syms[n].resolution = LDPR_PREEMPTED_REG; | |
452 | else if (blhe->u.def.section->owner == abfd) | |
453 | { | |
454 | syms[n].resolution = (ironly) | |
455 | ? LDPR_PREVAILING_DEF_IRONLY | |
456 | : LDPR_PREVAILING_DEF; | |
457 | continue; | |
458 | } | |
459 | ||
460 | /* Was originally def, weakdef, or common, but has been pre-empted. */ | |
461 | syms[n].resolution = is_ir_dummy_bfd (blhe->u.def.section->owner) | |
462 | ? LDPR_PREEMPTED_IR | |
463 | : LDPR_PREEMPTED_REG; | |
464 | } | |
465 | return LDPS_OK; | |
466 | } | |
467 | ||
468 | /* Add a new (real) input file generated by a plugin. */ | |
469 | static enum ld_plugin_status | |
470 | add_input_file (const char *pathname) | |
471 | { | |
472 | ASSERT (called_plugin); | |
d4cb7acd DK |
473 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_file_enum, |
474 | NULL)) | |
5d3236ee DK |
475 | return LDPS_ERR; |
476 | return LDPS_OK; | |
477 | } | |
478 | ||
479 | /* Add a new (real) library required by a plugin. */ | |
480 | static enum ld_plugin_status | |
481 | add_input_library (const char *pathname) | |
482 | { | |
483 | ASSERT (called_plugin); | |
d4cb7acd DK |
484 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_l_enum, |
485 | NULL)) | |
5d3236ee DK |
486 | return LDPS_ERR; |
487 | return LDPS_OK; | |
488 | } | |
489 | ||
490 | /* Set the extra library path to be used by libraries added via | |
491 | add_input_library. */ | |
492 | static enum ld_plugin_status | |
493 | set_extra_library_path (const char *path) | |
494 | { | |
495 | ASSERT (called_plugin); | |
d4cb7acd | 496 | ldfile_add_library_path (xstrdup (path), FALSE); |
5d3236ee DK |
497 | return LDPS_OK; |
498 | } | |
499 | ||
500 | /* Issue a diagnostic message from a plugin. */ | |
501 | static enum ld_plugin_status | |
502 | message (int level, const char *format, ...) | |
503 | { | |
504 | va_list args; | |
505 | va_start (args, format); | |
506 | ||
507 | switch (level) | |
508 | { | |
509 | case LDPL_INFO: | |
510 | vfinfo (stdout, format, args, FALSE); | |
511 | break; | |
512 | case LDPL_WARNING: | |
513 | vfinfo (stdout, format, args, TRUE); | |
514 | break; | |
515 | case LDPL_FATAL: | |
516 | case LDPL_ERROR: | |
517 | default: | |
518 | { | |
519 | char *newfmt = ACONCAT ((level == LDPL_FATAL ? "%F" : "%X", | |
520 | format, NULL)); | |
521 | vfinfo (stderr, newfmt, args, TRUE); | |
522 | } | |
523 | break; | |
524 | } | |
525 | ||
526 | va_end (args); | |
527 | return LDPS_OK; | |
528 | } | |
529 | ||
530 | /* Helper to size leading part of tv array and set it up. */ | |
531 | static size_t | |
532 | set_tv_header (struct ld_plugin_tv *tv) | |
533 | { | |
534 | size_t i; | |
535 | ||
536 | /* Version info. */ | |
537 | static const unsigned int major = (unsigned)(BFD_VERSION / 100000000UL); | |
538 | static const unsigned int minor = (unsigned)(BFD_VERSION / 1000000UL) % 100; | |
539 | ||
540 | if (!tv) | |
541 | return tv_header_size; | |
542 | ||
543 | for (i = 0; i < tv_header_size; i++) | |
544 | { | |
545 | tv[i].tv_tag = tv_header_tags[i]; | |
546 | #define TVU(x) tv[i].tv_u.tv_ ## x | |
547 | switch (tv[i].tv_tag) | |
548 | { | |
549 | case LDPT_MESSAGE: | |
550 | TVU(message) = message; | |
551 | break; | |
552 | case LDPT_API_VERSION: | |
553 | TVU(val) = LD_PLUGIN_API_VERSION; | |
554 | break; | |
555 | case LDPT_GNU_LD_VERSION: | |
556 | TVU(val) = major * 100 + minor; | |
557 | break; | |
558 | case LDPT_LINKER_OUTPUT: | |
559 | TVU(val) = link_info.relocatable ? LDPO_REL | |
560 | : (link_info.shared ? LDPO_DYN : LDPO_EXEC); | |
561 | break; | |
562 | case LDPT_OUTPUT_NAME: | |
563 | TVU(string) = output_filename; | |
564 | break; | |
565 | case LDPT_REGISTER_CLAIM_FILE_HOOK: | |
566 | TVU(register_claim_file) = register_claim_file; | |
567 | break; | |
568 | case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: | |
569 | TVU(register_all_symbols_read) = register_all_symbols_read; | |
570 | break; | |
571 | case LDPT_REGISTER_CLEANUP_HOOK: | |
572 | TVU(register_cleanup) = register_cleanup; | |
573 | break; | |
574 | case LDPT_ADD_SYMBOLS: | |
575 | TVU(add_symbols) = add_symbols; | |
576 | break; | |
577 | case LDPT_GET_INPUT_FILE: | |
578 | TVU(get_input_file) = get_input_file; | |
579 | break; | |
580 | case LDPT_RELEASE_INPUT_FILE: | |
581 | TVU(release_input_file) = release_input_file; | |
582 | break; | |
583 | case LDPT_GET_SYMBOLS: | |
584 | TVU(get_symbols) = get_symbols; | |
585 | break; | |
586 | case LDPT_ADD_INPUT_FILE: | |
587 | TVU(add_input_file) = add_input_file; | |
588 | break; | |
589 | case LDPT_ADD_INPUT_LIBRARY: | |
590 | TVU(add_input_library) = add_input_library; | |
591 | break; | |
592 | case LDPT_SET_EXTRA_LIBRARY_PATH: | |
593 | TVU(set_extra_library_path) = set_extra_library_path; | |
594 | break; | |
595 | default: | |
596 | /* Added a new entry to the array without adding | |
597 | a new case to set up its value is a bug. */ | |
598 | FAIL (); | |
599 | } | |
600 | #undef TVU | |
601 | } | |
602 | return tv_header_size; | |
603 | } | |
604 | ||
605 | /* Append the per-plugin args list and trailing LDPT_NULL to tv. */ | |
606 | static void | |
607 | set_tv_plugin_args (plugin_t *plugin, struct ld_plugin_tv *tv) | |
608 | { | |
609 | plugin_arg_t *arg = plugin->args; | |
610 | while (arg) | |
611 | { | |
612 | tv->tv_tag = LDPT_OPTION; | |
613 | tv->tv_u.tv_string = arg->arg; | |
614 | arg = arg->next; | |
615 | tv++; | |
616 | } | |
617 | tv->tv_tag = LDPT_NULL; | |
618 | tv->tv_u.tv_val = 0; | |
619 | } | |
620 | ||
d44ad554 DK |
621 | /* Return true if any plugins are active this run. Only valid |
622 | after options have been processed. */ | |
623 | bfd_boolean | |
624 | plugin_active_plugins_p (void) | |
625 | { | |
626 | return plugins_list != NULL; | |
627 | } | |
628 | ||
5d3236ee | 629 | /* Load up and initialise all plugins after argument parsing. */ |
d44ad554 DK |
630 | int |
631 | plugin_load_plugins (void) | |
5d3236ee DK |
632 | { |
633 | struct ld_plugin_tv *my_tv; | |
634 | unsigned int max_args = 0; | |
635 | plugin_t *curplug = plugins_list; | |
636 | ||
637 | /* If there are no plugins, we need do nothing this run. */ | |
638 | if (!curplug) | |
639 | return 0; | |
640 | ||
641 | /* First pass over plugins to find max # args needed so that we | |
642 | can size and allocate the tv array. */ | |
643 | while (curplug) | |
644 | { | |
645 | if (curplug->n_args > max_args) | |
646 | max_args = curplug->n_args; | |
647 | curplug = curplug->next; | |
648 | } | |
649 | ||
650 | /* Allocate tv array and initialise constant part. */ | |
651 | my_tv = xmalloc ((max_args + 1 + tv_header_size) * sizeof *my_tv); | |
652 | set_tv_header (my_tv); | |
653 | ||
654 | /* Pass over plugins again, activating them. */ | |
655 | curplug = plugins_list; | |
656 | while (curplug) | |
657 | { | |
658 | enum ld_plugin_status rv; | |
659 | ld_plugin_onload onloadfn = dlsym (curplug->dlhandle, "onload"); | |
660 | if (!onloadfn) | |
661 | onloadfn = dlsym (curplug->dlhandle, "_onload"); | |
662 | if (!onloadfn) | |
663 | return set_plugin_error (curplug->name); | |
664 | set_tv_plugin_args (curplug, &my_tv[tv_header_size]); | |
665 | called_plugin = curplug; | |
666 | rv = (*onloadfn) (my_tv); | |
667 | called_plugin = NULL; | |
668 | if (rv != LDPS_OK) | |
669 | return set_plugin_error (curplug->name); | |
670 | curplug = curplug->next; | |
671 | } | |
672 | ||
673 | /* Since plugin(s) inited ok, assume they're going to want symbol | |
674 | resolutions, which needs us to track which symbols are referenced | |
675 | by non-IR files using the linker's notice callback. */ | |
676 | link_info.notice_all = TRUE; | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
681 | /* Call 'claim file' hook for all plugins. */ | |
682 | int | |
683 | plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed) | |
684 | { | |
685 | plugin_t *curplug = plugins_list; | |
686 | *claimed = FALSE; | |
687 | if (no_more_claiming) | |
688 | return 0; | |
689 | while (curplug && !*claimed) | |
690 | { | |
691 | if (curplug->claim_file_handler) | |
692 | { | |
693 | enum ld_plugin_status rv; | |
694 | called_plugin = curplug; | |
695 | rv = (*curplug->claim_file_handler) (file, claimed); | |
696 | called_plugin = NULL; | |
697 | if (rv != LDPS_OK) | |
698 | set_plugin_error (curplug->name); | |
699 | } | |
700 | curplug = curplug->next; | |
701 | } | |
702 | return plugin_error_p () ? -1 : 0; | |
703 | } | |
704 | ||
705 | /* Call 'all symbols read' hook for all plugins. */ | |
706 | int | |
707 | plugin_call_all_symbols_read (void) | |
708 | { | |
709 | plugin_t *curplug = plugins_list; | |
710 | ||
711 | /* Disable any further file-claiming. */ | |
712 | no_more_claiming = TRUE; | |
713 | ||
714 | /* If --allow-multiple-definition is in effect, we need to disable it, | |
715 | as the plugin infrastructure relies on the multiple_definition | |
716 | callback to swap out the dummy IR-only BFDs for new real ones | |
717 | when it starts opening the files added during this callback. */ | |
718 | plugin_cached_allow_multiple_defs = link_info.allow_multiple_definition; | |
719 | link_info.allow_multiple_definition = FALSE; | |
720 | ||
721 | while (curplug) | |
722 | { | |
723 | if (curplug->all_symbols_read_handler) | |
724 | { | |
725 | enum ld_plugin_status rv; | |
726 | called_plugin = curplug; | |
727 | rv = (*curplug->all_symbols_read_handler) (); | |
728 | called_plugin = NULL; | |
729 | if (rv != LDPS_OK) | |
730 | set_plugin_error (curplug->name); | |
731 | } | |
732 | curplug = curplug->next; | |
733 | } | |
734 | return plugin_error_p () ? -1 : 0; | |
735 | } | |
736 | ||
737 | /* Call 'cleanup' hook for all plugins. */ | |
738 | int | |
739 | plugin_call_cleanup (void) | |
740 | { | |
741 | plugin_t *curplug = plugins_list; | |
742 | while (curplug) | |
743 | { | |
744 | if (curplug->cleanup_handler && !curplug->cleanup_done) | |
745 | { | |
746 | enum ld_plugin_status rv; | |
747 | curplug->cleanup_done = TRUE; | |
748 | called_plugin = curplug; | |
749 | rv = (*curplug->cleanup_handler) (); | |
750 | called_plugin = NULL; | |
751 | if (rv != LDPS_OK) | |
752 | set_plugin_error (curplug->name); | |
753 | dlclose (curplug->dlhandle); | |
754 | } | |
755 | curplug = curplug->next; | |
756 | } | |
757 | return plugin_error_p () ? -1 : 0; | |
758 | } | |
759 | ||
760 | /* Lazily init the non_ironly hash table. */ | |
761 | static void | |
762 | init_non_ironly_hash (void) | |
763 | { | |
764 | if (non_ironly_hash == NULL) | |
765 | { | |
766 | non_ironly_hash = | |
767 | (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table)); | |
768 | if (!bfd_hash_table_init_n (non_ironly_hash, | |
769 | bfd_hash_newfunc, | |
770 | sizeof (struct bfd_hash_entry), | |
771 | 61)) | |
772 | einfo (_("%P%F: bfd_hash_table_init failed: %E\n")); | |
773 | } | |
774 | } | |
775 | ||
776 | /* To determine which symbols should be resolved LDPR_PREVAILING_DEF | |
777 | and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as | |
778 | the linker adds them to the linker hash table. If we see a symbol | |
779 | being referenced from a non-IR file, we add it to the non_ironly hash | |
780 | table. If we can't find it there at get_symbols time, we know that | |
781 | it was referenced only by IR files. We have to notice_all symbols, | |
782 | because we won't necessarily know until later which ones will be | |
783 | contributed by IR files. */ | |
784 | bfd_boolean | |
785 | plugin_notice (struct bfd_link_info *info ATTRIBUTE_UNUSED, | |
786 | const char *name, bfd *abfd, | |
787 | asection *section, bfd_vma value ATTRIBUTE_UNUSED) | |
788 | { | |
789 | bfd_boolean is_ref = bfd_is_und_section (section); | |
790 | bfd_boolean is_dummy = is_ir_dummy_bfd (abfd); | |
791 | init_non_ironly_hash (); | |
792 | /* We only care about refs, not defs, indicated by section pointing | |
793 | to the undefined section (according to the bfd linker notice callback | |
794 | interface definition). */ | |
795 | if (is_ref && !is_dummy) | |
796 | { | |
797 | /* This is a ref from a non-IR file, so note the ref'd symbol | |
798 | in the non-IR-only hash. */ | |
799 | if (!bfd_hash_lookup (non_ironly_hash, name, TRUE, TRUE)) | |
800 | einfo (_("%P%X: %s: hash table failure adding symbol %s"), | |
801 | abfd->filename, name); | |
802 | } | |
803 | else if (!is_ref && is_dummy) | |
804 | { | |
805 | /* No further processing since this is a def from an IR dummy BFD. */ | |
806 | return FALSE; | |
807 | } | |
808 | ||
809 | /* Continue with cref/nocrossref/trace-sym processing. */ | |
810 | return TRUE; | |
811 | } | |
812 | ||
813 | /* When we add new object files to the link at all symbols read time, | |
814 | these contain the real code and symbols generated from the IR files, | |
815 | and so duplicate all the definitions already supplied by the dummy | |
816 | IR-only BFDs that we created at claim files time. We use the linker's | |
817 | multiple-definitions callback hook to fix up the clash, discarding | |
818 | the symbol from the IR-only BFD in favour of the symbol from the | |
819 | real BFD. We return true if this was not-really-a-clash because | |
820 | we've fixed it up, or anyway if --allow-multiple-definition was in | |
821 | effect (before we disabled it to ensure we got called back). */ | |
822 | bfd_boolean | |
823 | plugin_multiple_definition (struct bfd_link_info *info, const char *name, | |
824 | bfd *obfd, asection *osec ATTRIBUTE_UNUSED, | |
825 | bfd_vma oval ATTRIBUTE_UNUSED, | |
826 | bfd *nbfd, asection *nsec, bfd_vma nval) | |
827 | { | |
828 | if (is_ir_dummy_bfd (obfd)) | |
829 | { | |
830 | struct bfd_link_hash_entry *blhe = bfd_link_hash_lookup (info->hash, | |
831 | name, FALSE, FALSE, FALSE); | |
832 | if (!blhe) | |
833 | einfo (_("%P%X: %s: can't find IR symbol '%s'"), nbfd->filename, | |
834 | name); | |
835 | else if (blhe->type != bfd_link_hash_defined) | |
836 | einfo (_("%P%x: %s: bad IR symbol type %d"), name, blhe->type); | |
837 | /* Replace it with new details. */ | |
838 | blhe->u.def.section = nsec; | |
839 | blhe->u.def.value = nval; | |
840 | return TRUE; | |
841 | } | |
842 | return plugin_cached_allow_multiple_defs; | |
843 | } |