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5d3236ee | 1 | /* Plugin control for the GNU linker. |
b90efa5b | 2 | Copyright (C) 2010-2015 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" | |
35a1e5f3 | 24 | #include "libbfd.h" |
5d3236ee DK |
25 | #include "bfdlink.h" |
26 | #include "bfdver.h" | |
27 | #include "ld.h" | |
28 | #include "ldmain.h" | |
29 | #include "ldmisc.h" | |
30 | #include "ldexp.h" | |
31 | #include "ldlang.h" | |
32 | #include "ldfile.h" | |
33 | #include "plugin.h" | |
34 | #include "plugin-api.h" | |
35 | #include "elf-bfd.h" | |
2aec968d L |
36 | #if HAVE_MMAP |
37 | # include <sys/mman.h> | |
38 | # ifndef MAP_FAILED | |
39 | # define MAP_FAILED ((void *) -1) | |
40 | # endif | |
41 | # ifndef PROT_READ | |
42 | # define PROT_READ 0 | |
43 | # endif | |
44 | # ifndef MAP_PRIVATE | |
45 | # define MAP_PRIVATE 0 | |
46 | # endif | |
47 | #endif | |
f4b78d18 L |
48 | #include <errno.h> |
49 | #if !(defined(errno) || defined(_MSC_VER) && defined(_INC_ERRNO)) | |
50 | extern int errno; | |
51 | #endif | |
3917d5d5 | 52 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
f31d24a0 | 53 | #include <windows.h> |
3917d5d5 | 54 | #endif |
5d3236ee | 55 | |
1715a13c L |
56 | /* Report plugin symbols. */ |
57 | bfd_boolean report_plugin_symbols; | |
58 | ||
5d3236ee DK |
59 | /* The suffix to append to the name of the real (claimed) object file |
60 | when generating a dummy BFD to hold the IR symbols sent from the | |
cf4dc96f DK |
61 | plugin. For cosmetic use only; appears in maps, crefs etc. */ |
62 | #define IRONLY_SUFFIX " (symbol from plugin)" | |
5d3236ee DK |
63 | |
64 | /* Stores a single argument passed to a plugin. */ | |
65 | typedef struct plugin_arg | |
66 | { | |
67 | struct plugin_arg *next; | |
68 | const char *arg; | |
69 | } plugin_arg_t; | |
70 | ||
71 | /* Holds all details of a single plugin. */ | |
72 | typedef struct plugin | |
73 | { | |
74 | /* Next on the list of plugins, or NULL at end of chain. */ | |
75 | struct plugin *next; | |
76 | /* The argument string given to --plugin. */ | |
77 | const char *name; | |
78 | /* The shared library handle returned by dlopen. */ | |
79 | void *dlhandle; | |
80 | /* The list of argument string given to --plugin-opt. */ | |
81 | plugin_arg_t *args; | |
82 | /* Number of args in the list, for convenience. */ | |
83 | size_t n_args; | |
84 | /* The plugin's event handlers. */ | |
85 | ld_plugin_claim_file_handler claim_file_handler; | |
86 | ld_plugin_all_symbols_read_handler all_symbols_read_handler; | |
87 | ld_plugin_cleanup_handler cleanup_handler; | |
88 | /* TRUE if the cleanup handlers have been called. */ | |
89 | bfd_boolean cleanup_done; | |
90 | } plugin_t; | |
91 | ||
2aec968d L |
92 | typedef struct view_buffer |
93 | { | |
94 | char *addr; | |
95 | size_t filesize; | |
96 | off_t offset; | |
97 | } view_buffer_t; | |
98 | ||
f4b78d18 L |
99 | /* The internal version of struct ld_plugin_input_file with a BFD |
100 | pointer. */ | |
101 | typedef struct plugin_input_file | |
102 | { | |
103 | bfd *abfd; | |
2aec968d | 104 | view_buffer_t view_buffer; |
f4b78d18 L |
105 | char *name; |
106 | int fd; | |
38604796 | 107 | bfd_boolean use_mmap; |
f4b78d18 L |
108 | off_t offset; |
109 | off_t filesize; | |
110 | } plugin_input_file_t; | |
111 | ||
5d3236ee DK |
112 | /* The master list of all plugins. */ |
113 | static plugin_t *plugins_list = NULL; | |
114 | ||
115 | /* We keep a tail pointer for easy linking on the end. */ | |
116 | static plugin_t **plugins_tail_chain_ptr = &plugins_list; | |
117 | ||
118 | /* The last plugin added to the list, for receiving args. */ | |
119 | static plugin_t *last_plugin = NULL; | |
120 | ||
121 | /* The tail of the arg chain of the last plugin added to the list. */ | |
122 | static plugin_arg_t **last_plugin_args_tail_chain_ptr = NULL; | |
123 | ||
124 | /* The plugin which is currently having a callback executed. */ | |
125 | static plugin_t *called_plugin = NULL; | |
126 | ||
127 | /* Last plugin to cause an error, if any. */ | |
128 | static const char *error_plugin = NULL; | |
129 | ||
24f58f47 | 130 | /* State of linker "notice" interface before we poked at it. */ |
9e2278f5 | 131 | static bfd_boolean orig_notice_all; |
9e2278f5 AM |
132 | |
133 | /* Original linker callbacks, and the plugin version. */ | |
134 | static const struct bfd_link_callbacks *orig_callbacks; | |
135 | static struct bfd_link_callbacks plugin_callbacks; | |
136 | ||
5d3236ee DK |
137 | /* Set at all symbols read time, to avoid recursively offering the plugin |
138 | its own newly-added input files and libs to claim. */ | |
9e2278f5 | 139 | bfd_boolean no_more_claiming = FALSE; |
5d3236ee | 140 | |
38604796 L |
141 | #if HAVE_MMAP && HAVE_GETPAGESIZE |
142 | /* Page size used by mmap. */ | |
143 | static off_t plugin_pagesize; | |
144 | #endif | |
145 | ||
5d3236ee DK |
146 | /* List of tags to set in the constant leading part of the tv array. */ |
147 | static const enum ld_plugin_tag tv_header_tags[] = | |
148 | { | |
149 | LDPT_MESSAGE, | |
150 | LDPT_API_VERSION, | |
151 | LDPT_GNU_LD_VERSION, | |
152 | LDPT_LINKER_OUTPUT, | |
153 | LDPT_OUTPUT_NAME, | |
154 | LDPT_REGISTER_CLAIM_FILE_HOOK, | |
155 | LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK, | |
156 | LDPT_REGISTER_CLEANUP_HOOK, | |
157 | LDPT_ADD_SYMBOLS, | |
158 | LDPT_GET_INPUT_FILE, | |
15f7a26b | 159 | LDPT_GET_VIEW, |
5d3236ee DK |
160 | LDPT_RELEASE_INPUT_FILE, |
161 | LDPT_GET_SYMBOLS, | |
69ee6ab2 | 162 | LDPT_GET_SYMBOLS_V2, |
5d3236ee DK |
163 | LDPT_ADD_INPUT_FILE, |
164 | LDPT_ADD_INPUT_LIBRARY, | |
165 | LDPT_SET_EXTRA_LIBRARY_PATH | |
166 | }; | |
167 | ||
168 | /* How many entries in the constant leading part of the tv array. */ | |
169 | static const size_t tv_header_size = ARRAY_SIZE (tv_header_tags); | |
170 | ||
9e2278f5 | 171 | /* Forward references. */ |
16d96b5b | 172 | static bfd_boolean plugin_notice (struct bfd_link_info *, |
46135103 AM |
173 | struct bfd_link_hash_entry *, |
174 | struct bfd_link_hash_entry *, | |
175 | bfd *, asection *, bfd_vma, flagword); | |
9e2278f5 | 176 | |
3917d5d5 DK |
177 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
178 | ||
179 | #define RTLD_NOW 0 /* Dummy value. */ | |
180 | ||
181 | static void * | |
182 | dlopen (const char *file, int mode ATTRIBUTE_UNUSED) | |
183 | { | |
184 | return LoadLibrary (file); | |
185 | } | |
186 | ||
187 | static void * | |
188 | dlsym (void *handle, const char *name) | |
189 | { | |
190 | return GetProcAddress (handle, name); | |
191 | } | |
192 | ||
193 | static int | |
194 | dlclose (void *handle) | |
195 | { | |
196 | FreeLibrary (handle); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */ | |
201 | ||
d82184d7 L |
202 | #ifndef HAVE_DLFCN_H |
203 | static const char * | |
204 | dlerror (void) | |
205 | { | |
206 | return ""; | |
207 | } | |
208 | #endif | |
209 | ||
5d3236ee DK |
210 | /* Helper function for exiting with error status. */ |
211 | static int | |
212 | set_plugin_error (const char *plugin) | |
213 | { | |
214 | error_plugin = plugin; | |
215 | return -1; | |
216 | } | |
217 | ||
218 | /* Test if an error occurred. */ | |
219 | static bfd_boolean | |
220 | plugin_error_p (void) | |
221 | { | |
222 | return error_plugin != NULL; | |
223 | } | |
224 | ||
225 | /* Return name of plugin which caused an error if any. */ | |
d44ad554 DK |
226 | const char * |
227 | plugin_error_plugin (void) | |
5d3236ee DK |
228 | { |
229 | return error_plugin ? error_plugin : _("<no plugin>"); | |
230 | } | |
231 | ||
232 | /* Handle -plugin arg: find and load plugin, or return error. */ | |
d82184d7 | 233 | void |
d44ad554 | 234 | plugin_opt_plugin (const char *plugin) |
5d3236ee DK |
235 | { |
236 | plugin_t *newplug; | |
237 | ||
238 | newplug = xmalloc (sizeof *newplug); | |
239 | memset (newplug, 0, sizeof *newplug); | |
240 | newplug->name = plugin; | |
241 | newplug->dlhandle = dlopen (plugin, RTLD_NOW); | |
242 | if (!newplug->dlhandle) | |
d82184d7 | 243 | einfo (_("%P%F: %s: error loading plugin: %s\n"), plugin, dlerror ()); |
5d3236ee DK |
244 | |
245 | /* Chain on end, so when we run list it is in command-line order. */ | |
246 | *plugins_tail_chain_ptr = newplug; | |
247 | plugins_tail_chain_ptr = &newplug->next; | |
248 | ||
249 | /* Record it as current plugin for receiving args. */ | |
250 | last_plugin = newplug; | |
251 | last_plugin_args_tail_chain_ptr = &newplug->args; | |
5d3236ee DK |
252 | } |
253 | ||
254 | /* Accumulate option arguments for last-loaded plugin, or return | |
255 | error if none. */ | |
d44ad554 DK |
256 | int |
257 | plugin_opt_plugin_arg (const char *arg) | |
5d3236ee DK |
258 | { |
259 | plugin_arg_t *newarg; | |
260 | ||
261 | if (!last_plugin) | |
262 | return set_plugin_error (_("<no plugin>")); | |
263 | ||
97964ab3 AM |
264 | /* Ignore -pass-through= from GCC driver. */ |
265 | if (*arg == '-') | |
266 | { | |
267 | const char *p = arg + 1; | |
268 | ||
269 | if (*p == '-') | |
270 | ++p; | |
271 | if (strncmp (p, "pass-through=", 13) == 0) | |
272 | return 0; | |
273 | } | |
274 | ||
5d3236ee DK |
275 | newarg = xmalloc (sizeof *newarg); |
276 | newarg->arg = arg; | |
277 | newarg->next = NULL; | |
278 | ||
279 | /* Chain on end to preserve command-line order. */ | |
280 | *last_plugin_args_tail_chain_ptr = newarg; | |
281 | last_plugin_args_tail_chain_ptr = &newarg->next; | |
282 | last_plugin->n_args++; | |
283 | return 0; | |
284 | } | |
285 | ||
37a3056a L |
286 | /* Generate a dummy BFD to represent an IR file, for any callers of |
287 | plugin_call_claim_file to use as the handle in the ld_plugin_input_file | |
288 | struct that they build to pass in. The BFD is initially writable, so | |
289 | that symbols can be added to it; it must be made readable after the | |
290 | add_symbols hook has been called so that it can be read when linking. */ | |
291 | static bfd * | |
5d3236ee DK |
292 | plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate) |
293 | { | |
bc110b6e AM |
294 | bfd *abfd; |
295 | ||
296 | bfd_use_reserved_id = 1; | |
9e2278f5 | 297 | abfd = bfd_create (concat (name, IRONLY_SUFFIX, (const char *) NULL), |
bc110b6e | 298 | srctemplate); |
9e2278f5 AM |
299 | if (abfd != NULL) |
300 | { | |
301 | abfd->flags |= BFD_LINKER_CREATED | BFD_PLUGIN; | |
302 | bfd_set_arch_info (abfd, bfd_get_arch_info (srctemplate)); | |
303 | bfd_set_gp_size (abfd, bfd_get_gp_size (srctemplate)); | |
304 | if (bfd_make_writable (abfd) | |
305 | && bfd_copy_private_bfd_data (srctemplate, abfd)) | |
306 | { | |
307 | flagword flags; | |
308 | ||
c77ec726 | 309 | /* Create section to own the symbols. */ |
9e2278f5 AM |
310 | flags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY |
311 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE); | |
312 | if (bfd_make_section_anyway_with_flags (abfd, ".text", flags)) | |
313 | return abfd; | |
314 | } | |
315 | } | |
316 | einfo (_("could not create dummy IR bfd: %F%E\n")); | |
317 | return NULL; | |
5d3236ee DK |
318 | } |
319 | ||
d44ad554 | 320 | /* Check if the BFD passed in is an IR dummy object file. */ |
23ebe1a0 | 321 | static inline bfd_boolean |
5d3236ee DK |
322 | is_ir_dummy_bfd (const bfd *abfd) |
323 | { | |
cf4dc96f | 324 | /* ABFD can sometimes legitimately be NULL, e.g. when called from one |
23ebe1a0 AM |
325 | of the linker callbacks for a symbol in the *ABS* or *UND* sections. */ |
326 | return abfd != NULL && (abfd->flags & BFD_PLUGIN) != 0; | |
5d3236ee DK |
327 | } |
328 | ||
329 | /* Helpers to convert between BFD and GOLD symbol formats. */ | |
330 | static enum ld_plugin_status | |
331 | asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, | |
f84854b6 | 332 | const struct ld_plugin_symbol *ldsym) |
5d3236ee DK |
333 | { |
334 | flagword flags = BSF_NO_FLAGS; | |
335 | struct bfd_section *section; | |
336 | ||
337 | asym->the_bfd = abfd; | |
f84854b6 | 338 | asym->name = (ldsym->version |
9e2278f5 | 339 | ? concat (ldsym->name, "@", ldsym->version, (const char *) NULL) |
f84854b6 | 340 | : ldsym->name); |
5d3236ee DK |
341 | asym->value = 0; |
342 | switch (ldsym->def) | |
343 | { | |
344 | case LDPK_WEAKDEF: | |
345 | flags = BSF_WEAK; | |
346 | /* FALLTHRU */ | |
347 | case LDPK_DEF: | |
348 | flags |= BSF_GLOBAL; | |
c77ec726 AM |
349 | if (ldsym->comdat_key) |
350 | { | |
351 | char *name = concat (".gnu.linkonce.t.", ldsym->comdat_key, | |
352 | (const char *) NULL); | |
353 | section = bfd_get_section_by_name (abfd, name); | |
354 | if (section != NULL) | |
355 | free (name); | |
356 | else | |
357 | { | |
358 | flagword sflags; | |
359 | ||
360 | sflags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY | |
361 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE | |
362 | | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD); | |
363 | section = bfd_make_section_anyway_with_flags (abfd, name, sflags); | |
364 | if (section == NULL) | |
365 | return LDPS_ERR; | |
366 | } | |
367 | } | |
368 | else | |
369 | section = bfd_get_section_by_name (abfd, ".text"); | |
5d3236ee DK |
370 | break; |
371 | ||
372 | case LDPK_WEAKUNDEF: | |
373 | flags = BSF_WEAK; | |
374 | /* FALLTHRU */ | |
375 | case LDPK_UNDEF: | |
376 | section = bfd_und_section_ptr; | |
377 | break; | |
378 | ||
379 | case LDPK_COMMON: | |
380 | flags = BSF_GLOBAL; | |
381 | section = bfd_com_section_ptr; | |
382 | asym->value = ldsym->size; | |
5c08b7d4 L |
383 | /* For ELF targets, set alignment of common symbol to 1. */ |
384 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
02d00247 AM |
385 | { |
386 | ((elf_symbol_type *) asym)->internal_elf_sym.st_shndx = SHN_COMMON; | |
387 | ((elf_symbol_type *) asym)->internal_elf_sym.st_value = 1; | |
388 | } | |
5d3236ee DK |
389 | break; |
390 | ||
391 | default: | |
392 | return LDPS_ERR; | |
393 | } | |
394 | asym->flags = flags; | |
395 | asym->section = section; | |
396 | ||
397 | /* Visibility only applies on ELF targets. */ | |
398 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
399 | { | |
400 | elf_symbol_type *elfsym = elf_symbol_from (abfd, asym); | |
cfac8028 L |
401 | unsigned char visibility; |
402 | ||
5d3236ee | 403 | if (!elfsym) |
ea360572 | 404 | einfo (_("%P%F: %s: non-ELF symbol in ELF BFD!\n"), asym->name); |
cfac8028 L |
405 | switch (ldsym->visibility) |
406 | { | |
407 | default: | |
ea360572 | 408 | einfo (_("%P%F: unknown ELF symbol visibility: %d!\n"), |
cfac8028 L |
409 | ldsym->visibility); |
410 | case LDPV_DEFAULT: | |
411 | visibility = STV_DEFAULT; | |
412 | break; | |
413 | case LDPV_PROTECTED: | |
414 | visibility = STV_PROTECTED; | |
415 | break; | |
416 | case LDPV_INTERNAL: | |
417 | visibility = STV_INTERNAL; | |
418 | break; | |
419 | case LDPV_HIDDEN: | |
420 | visibility = STV_HIDDEN; | |
421 | break; | |
422 | } | |
423 | elfsym->internal_elf_sym.st_other | |
424 | = (visibility | (elfsym->internal_elf_sym.st_other | |
425 | & ~ELF_ST_VISIBILITY (-1))); | |
5d3236ee DK |
426 | } |
427 | ||
428 | return LDPS_OK; | |
429 | } | |
430 | ||
431 | /* Register a claim-file handler. */ | |
432 | static enum ld_plugin_status | |
433 | register_claim_file (ld_plugin_claim_file_handler handler) | |
434 | { | |
435 | ASSERT (called_plugin); | |
436 | called_plugin->claim_file_handler = handler; | |
437 | return LDPS_OK; | |
438 | } | |
439 | ||
440 | /* Register an all-symbols-read handler. */ | |
441 | static enum ld_plugin_status | |
442 | register_all_symbols_read (ld_plugin_all_symbols_read_handler handler) | |
443 | { | |
444 | ASSERT (called_plugin); | |
445 | called_plugin->all_symbols_read_handler = handler; | |
446 | return LDPS_OK; | |
447 | } | |
448 | ||
449 | /* Register a cleanup handler. */ | |
450 | static enum ld_plugin_status | |
451 | register_cleanup (ld_plugin_cleanup_handler handler) | |
452 | { | |
453 | ASSERT (called_plugin); | |
454 | called_plugin->cleanup_handler = handler; | |
455 | return LDPS_OK; | |
456 | } | |
457 | ||
458 | /* Add symbols from a plugin-claimed input file. */ | |
459 | static enum ld_plugin_status | |
460 | add_symbols (void *handle, int nsyms, const struct ld_plugin_symbol *syms) | |
461 | { | |
462 | asymbol **symptrs; | |
f4b78d18 L |
463 | plugin_input_file_t *input = handle; |
464 | bfd *abfd = input->abfd; | |
7fe550fc | 465 | int n; |
43e1669b | 466 | |
5d3236ee DK |
467 | ASSERT (called_plugin); |
468 | symptrs = xmalloc (nsyms * sizeof *symptrs); | |
7fe550fc | 469 | for (n = 0; n < nsyms; n++) |
5d3236ee DK |
470 | { |
471 | enum ld_plugin_status rv; | |
0c511000 AM |
472 | asymbol *bfdsym; |
473 | ||
0c511000 | 474 | bfdsym = bfd_make_empty_symbol (abfd); |
7fe550fc | 475 | symptrs[n] = bfdsym; |
5d3236ee DK |
476 | rv = asymbol_from_plugin_symbol (abfd, bfdsym, syms + n); |
477 | if (rv != LDPS_OK) | |
478 | return rv; | |
479 | } | |
7fe550fc | 480 | bfd_set_symtab (abfd, symptrs, nsyms); |
5d3236ee DK |
481 | return LDPS_OK; |
482 | } | |
483 | ||
484 | /* Get the input file information with an open (possibly re-opened) | |
485 | file descriptor. */ | |
486 | static enum ld_plugin_status | |
f4b78d18 | 487 | get_input_file (const void *handle, struct ld_plugin_input_file *file) |
5d3236ee | 488 | { |
f4b78d18 L |
489 | const plugin_input_file_t *input = handle; |
490 | ||
5d3236ee | 491 | ASSERT (called_plugin); |
f4b78d18 L |
492 | |
493 | file->name = input->name; | |
494 | file->offset = input->offset; | |
495 | file->filesize = input->filesize; | |
496 | file->handle = (void *) handle; | |
497 | ||
498 | return LDPS_OK; | |
5d3236ee DK |
499 | } |
500 | ||
15f7a26b L |
501 | /* Get view of the input file. */ |
502 | static enum ld_plugin_status | |
f4b78d18 | 503 | get_view (const void *handle, const void **viewp) |
15f7a26b | 504 | { |
2aec968d | 505 | plugin_input_file_t *input = (plugin_input_file_t *) handle; |
f4b78d18 | 506 | char *buffer; |
2aec968d | 507 | size_t size = input->filesize; |
38604796 L |
508 | off_t offset = input->offset; |
509 | #if HAVE_MMAP && HAVE_GETPAGESIZE | |
510 | off_t bias; | |
fe905789 | 511 | #endif |
f4b78d18 | 512 | |
15f7a26b | 513 | ASSERT (called_plugin); |
f4b78d18 | 514 | |
2aec968d L |
515 | /* FIXME: einfo should support %lld. */ |
516 | if ((off_t) size != input->filesize) | |
517 | einfo (_("%P%F: unsupported input file size: %s (%ld bytes)\n"), | |
518 | input->name, (long) input->filesize); | |
f4b78d18 | 519 | |
2aec968d L |
520 | /* Check the cached view buffer. */ |
521 | if (input->view_buffer.addr != NULL | |
522 | && input->view_buffer.filesize == size | |
38604796 | 523 | && input->view_buffer.offset == offset) |
2aec968d L |
524 | { |
525 | *viewp = input->view_buffer.addr; | |
526 | return LDPS_OK; | |
527 | } | |
528 | ||
529 | input->view_buffer.filesize = size; | |
38604796 | 530 | input->view_buffer.offset = offset; |
f4b78d18 | 531 | |
2aec968d | 532 | #if HAVE_MMAP |
fe905789 | 533 | # if HAVE_GETPAGESIZE |
38604796 L |
534 | bias = offset % plugin_pagesize; |
535 | offset -= bias; | |
fe905789 L |
536 | size += bias; |
537 | # endif | |
538 | buffer = mmap (NULL, size, PROT_READ, MAP_PRIVATE, input->fd, offset); | |
539 | if (buffer != MAP_FAILED) | |
38604796 L |
540 | { |
541 | input->use_mmap = TRUE; | |
542 | # if HAVE_GETPAGESIZE | |
543 | buffer += bias; | |
b677c456 | 544 | # endif |
38604796 L |
545 | } |
546 | else | |
2aec968d | 547 | #endif |
f4b78d18 | 548 | { |
2aec968d L |
549 | char *p; |
550 | ||
38604796 L |
551 | input->use_mmap = FALSE; |
552 | ||
553 | if (lseek (input->fd, offset, SEEK_SET) < 0) | |
2aec968d L |
554 | return LDPS_ERR; |
555 | ||
556 | buffer = bfd_alloc (input->abfd, size); | |
557 | if (buffer == NULL) | |
558 | return LDPS_ERR; | |
559 | ||
560 | p = buffer; | |
561 | do | |
f4b78d18 | 562 | { |
2aec968d L |
563 | ssize_t got = read (input->fd, p, size); |
564 | if (got == 0) | |
565 | break; | |
566 | else if (got > 0) | |
567 | { | |
568 | p += got; | |
569 | size -= got; | |
570 | } | |
571 | else if (errno != EINTR) | |
572 | return LDPS_ERR; | |
f4b78d18 | 573 | } |
2aec968d | 574 | while (size > 0); |
f4b78d18 | 575 | } |
2aec968d L |
576 | |
577 | input->view_buffer.addr = buffer; | |
578 | *viewp = buffer; | |
f4b78d18 L |
579 | |
580 | return LDPS_OK; | |
15f7a26b L |
581 | } |
582 | ||
5d3236ee DK |
583 | /* Release the input file. */ |
584 | static enum ld_plugin_status | |
f4b78d18 | 585 | release_input_file (const void *handle) |
5d3236ee | 586 | { |
119d62ff | 587 | plugin_input_file_t *input = (plugin_input_file_t *) handle; |
5d3236ee | 588 | ASSERT (called_plugin); |
f4b78d18 | 589 | if (input->fd != -1) |
119d62ff L |
590 | { |
591 | close (input->fd); | |
592 | input->fd = -1; | |
593 | } | |
f4b78d18 | 594 | return LDPS_OK; |
5d3236ee DK |
595 | } |
596 | ||
42a851a9 DK |
597 | /* Return TRUE if a defined symbol might be reachable from outside the |
598 | universe of claimed objects. */ | |
599 | static inline bfd_boolean | |
9bbc1a67 | 600 | is_visible_from_outside (struct ld_plugin_symbol *lsym, |
f84854b6 | 601 | struct bfd_link_hash_entry *blhe) |
42a851a9 | 602 | { |
35ed3f94 AM |
603 | struct bfd_sym_chain *sym; |
604 | ||
42a851a9 DK |
605 | if (link_info.relocatable) |
606 | return TRUE; | |
9bbc1a67 | 607 | if (link_info.export_dynamic || !link_info.executable) |
42a851a9 | 608 | { |
fd91d419 L |
609 | /* Check if symbol is hidden by version script. */ |
610 | if (bfd_hide_sym_by_version (link_info.version_info, | |
611 | blhe->root.string)) | |
612 | return FALSE; | |
42a851a9 DK |
613 | /* Only ELF symbols really have visibility. */ |
614 | if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour) | |
615 | { | |
616 | struct elf_link_hash_entry *el = (struct elf_link_hash_entry *)blhe; | |
617 | int vis = ELF_ST_VISIBILITY (el->other); | |
618 | return vis == STV_DEFAULT || vis == STV_PROTECTED; | |
619 | } | |
620 | /* On non-ELF targets, we can safely make inferences by considering | |
f84854b6 | 621 | what visibility the plugin would have liked to apply when it first |
42a851a9 DK |
622 | sent us the symbol. During ELF symbol processing, visibility only |
623 | ever becomes more restrictive, not less, when symbols are merged, | |
624 | so this is a conservative estimate; it may give false positives, | |
625 | declaring something visible from outside when it in fact would | |
626 | not have been, but this will only lead to missed optimisation | |
627 | opportunities during LTRANS at worst; it will not give false | |
628 | negatives, which can lead to the disastrous conclusion that the | |
629 | related symbol is IRONLY. (See GCC PR46319 for an example.) */ | |
cfac8028 L |
630 | return (lsym->visibility == LDPV_DEFAULT |
631 | || lsym->visibility == LDPV_PROTECTED); | |
42a851a9 | 632 | } |
35ed3f94 AM |
633 | |
634 | for (sym = &entry_symbol; sym != NULL; sym = sym->next) | |
635 | if (sym->name | |
636 | && strcmp (sym->name, blhe->root.string) == 0) | |
637 | return TRUE; | |
638 | ||
42a851a9 DK |
639 | return FALSE; |
640 | } | |
641 | ||
5d3236ee DK |
642 | /* Get the symbol resolution info for a plugin-claimed input file. */ |
643 | static enum ld_plugin_status | |
69ee6ab2 AM |
644 | get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms, |
645 | int def_ironly_exp) | |
5d3236ee | 646 | { |
f4b78d18 L |
647 | const plugin_input_file_t *input = handle; |
648 | const bfd *abfd = (const bfd *) input->abfd; | |
5d3236ee | 649 | int n; |
69ee6ab2 | 650 | |
5d3236ee DK |
651 | ASSERT (called_plugin); |
652 | for (n = 0; n < nsyms; n++) | |
653 | { | |
654 | struct bfd_link_hash_entry *blhe; | |
42a851a9 | 655 | asection *owner_sec; |
69ee6ab2 AM |
656 | int res; |
657 | ||
10be1b6a DK |
658 | if (syms[n].def != LDPK_UNDEF) |
659 | blhe = bfd_link_hash_lookup (link_info.hash, syms[n].name, | |
660 | FALSE, FALSE, TRUE); | |
661 | else | |
662 | blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, &link_info, | |
663 | syms[n].name, FALSE, FALSE, TRUE); | |
5d3236ee DK |
664 | if (!blhe) |
665 | { | |
69ee6ab2 | 666 | res = LDPR_UNKNOWN; |
1715a13c | 667 | goto report_symbol; |
5d3236ee DK |
668 | } |
669 | ||
670 | /* Determine resolution from blhe type and symbol's original type. */ | |
671 | if (blhe->type == bfd_link_hash_undefined | |
f84854b6 | 672 | || blhe->type == bfd_link_hash_undefweak) |
5d3236ee | 673 | { |
69ee6ab2 | 674 | res = LDPR_UNDEF; |
1715a13c | 675 | goto report_symbol; |
5d3236ee DK |
676 | } |
677 | if (blhe->type != bfd_link_hash_defined | |
f84854b6 L |
678 | && blhe->type != bfd_link_hash_defweak |
679 | && blhe->type != bfd_link_hash_common) | |
5d3236ee DK |
680 | { |
681 | /* We should not have a new, indirect or warning symbol here. */ | |
ea360572 | 682 | einfo ("%P%F: %s: plugin symbol table corrupt (sym type %d)\n", |
f84854b6 | 683 | called_plugin->name, blhe->type); |
5d3236ee DK |
684 | } |
685 | ||
42a851a9 DK |
686 | /* Find out which section owns the symbol. Since it's not undef, |
687 | it must have an owner; if it's not a common symbol, both defs | |
688 | and weakdefs keep it in the same place. */ | |
9e2278f5 AM |
689 | owner_sec = (blhe->type == bfd_link_hash_common |
690 | ? blhe->u.c.p->section | |
691 | : blhe->u.def.section); | |
42a851a9 | 692 | |
5d3236ee DK |
693 | |
694 | /* If it was originally undefined or common, then it has been | |
f84854b6 L |
695 | resolved; determine how. */ |
696 | if (syms[n].def == LDPK_UNDEF | |
697 | || syms[n].def == LDPK_WEAKUNDEF | |
5d3236ee DK |
698 | || syms[n].def == LDPK_COMMON) |
699 | { | |
5d3236ee | 700 | if (owner_sec->owner == link_info.output_bfd) |
69ee6ab2 | 701 | res = LDPR_RESOLVED_EXEC; |
5d3236ee | 702 | else if (owner_sec->owner == abfd) |
69ee6ab2 | 703 | res = LDPR_PREVAILING_DEF_IRONLY; |
5d3236ee | 704 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
69ee6ab2 | 705 | res = LDPR_RESOLVED_IR; |
cc322803 L |
706 | else if (owner_sec->owner != NULL |
707 | && (owner_sec->owner->flags & DYNAMIC) != 0) | |
69ee6ab2 | 708 | res = LDPR_RESOLVED_DYN; |
5d3236ee | 709 | else |
69ee6ab2 | 710 | res = LDPR_RESOLVED_EXEC; |
5d3236ee DK |
711 | } |
712 | ||
713 | /* Was originally def, or weakdef. Does it prevail? If the | |
f84854b6 | 714 | owner is the original dummy bfd that supplied it, then this |
5d3236ee | 715 | is the definition that has prevailed. */ |
69ee6ab2 AM |
716 | else if (owner_sec->owner == link_info.output_bfd) |
717 | res = LDPR_PREEMPTED_REG; | |
42a851a9 | 718 | else if (owner_sec->owner == abfd) |
69ee6ab2 | 719 | res = LDPR_PREVAILING_DEF_IRONLY; |
5d3236ee DK |
720 | |
721 | /* Was originally def, weakdef, or common, but has been pre-empted. */ | |
69ee6ab2 AM |
722 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
723 | res = LDPR_PREEMPTED_IR; | |
724 | else | |
725 | res = LDPR_PREEMPTED_REG; | |
726 | ||
727 | if (res == LDPR_PREVAILING_DEF_IRONLY) | |
728 | { | |
729 | /* We need to know if the sym is referenced from non-IR files. Or | |
730 | even potentially-referenced, perhaps in a future final link if | |
731 | this is a partial one, perhaps dynamically at load-time if the | |
732 | symbol is externally visible. */ | |
733 | if (blhe->non_ir_ref) | |
734 | res = LDPR_PREVAILING_DEF; | |
9bbc1a67 | 735 | else if (is_visible_from_outside (&syms[n], blhe)) |
69ee6ab2 AM |
736 | res = def_ironly_exp; |
737 | } | |
1715a13c | 738 | |
9e2278f5 | 739 | report_symbol: |
69ee6ab2 | 740 | syms[n].resolution = res; |
1715a13c | 741 | if (report_plugin_symbols) |
9e2278f5 AM |
742 | einfo (_("%P: %B: symbol `%s' " |
743 | "definition: %d, visibility: %d, resolution: %d\n"), | |
744 | abfd, syms[n].name, | |
69ee6ab2 | 745 | syms[n].def, syms[n].visibility, res); |
5d3236ee DK |
746 | } |
747 | return LDPS_OK; | |
748 | } | |
749 | ||
69ee6ab2 AM |
750 | static enum ld_plugin_status |
751 | get_symbols_v1 (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
752 | { | |
753 | return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF); | |
754 | } | |
755 | ||
756 | static enum ld_plugin_status | |
757 | get_symbols_v2 (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
758 | { | |
759 | return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF_IRONLY_EXP); | |
760 | } | |
761 | ||
5d3236ee DK |
762 | /* Add a new (real) input file generated by a plugin. */ |
763 | static enum ld_plugin_status | |
764 | add_input_file (const char *pathname) | |
765 | { | |
766 | ASSERT (called_plugin); | |
d4cb7acd | 767 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_file_enum, |
f84854b6 | 768 | NULL)) |
5d3236ee DK |
769 | return LDPS_ERR; |
770 | return LDPS_OK; | |
771 | } | |
772 | ||
773 | /* Add a new (real) library required by a plugin. */ | |
774 | static enum ld_plugin_status | |
775 | add_input_library (const char *pathname) | |
776 | { | |
777 | ASSERT (called_plugin); | |
d4cb7acd | 778 | if (!lang_add_input_file (xstrdup (pathname), lang_input_file_is_l_enum, |
f84854b6 | 779 | NULL)) |
5d3236ee DK |
780 | return LDPS_ERR; |
781 | return LDPS_OK; | |
782 | } | |
783 | ||
784 | /* Set the extra library path to be used by libraries added via | |
785 | add_input_library. */ | |
786 | static enum ld_plugin_status | |
787 | set_extra_library_path (const char *path) | |
788 | { | |
789 | ASSERT (called_plugin); | |
d4cb7acd | 790 | ldfile_add_library_path (xstrdup (path), FALSE); |
5d3236ee DK |
791 | return LDPS_OK; |
792 | } | |
793 | ||
794 | /* Issue a diagnostic message from a plugin. */ | |
795 | static enum ld_plugin_status | |
796 | message (int level, const char *format, ...) | |
797 | { | |
798 | va_list args; | |
799 | va_start (args, format); | |
800 | ||
801 | switch (level) | |
802 | { | |
803 | case LDPL_INFO: | |
804 | vfinfo (stdout, format, args, FALSE); | |
d251c5c4 | 805 | putchar ('\n'); |
5d3236ee DK |
806 | break; |
807 | case LDPL_WARNING: | |
808 | vfinfo (stdout, format, args, TRUE); | |
d251c5c4 | 809 | putchar ('\n'); |
5d3236ee DK |
810 | break; |
811 | case LDPL_FATAL: | |
812 | case LDPL_ERROR: | |
813 | default: | |
9e2278f5 AM |
814 | { |
815 | char *newfmt = ACONCAT ((level == LDPL_FATAL ? "%P%F: " : "%P%X: ", | |
816 | format, "\n", (const char *) NULL)); | |
817 | fflush (stdout); | |
818 | vfinfo (stderr, newfmt, args, TRUE); | |
819 | fflush (stderr); | |
820 | } | |
5d3236ee DK |
821 | break; |
822 | } | |
823 | ||
824 | va_end (args); | |
825 | return LDPS_OK; | |
826 | } | |
827 | ||
828 | /* Helper to size leading part of tv array and set it up. */ | |
69ee6ab2 | 829 | static void |
5d3236ee DK |
830 | set_tv_header (struct ld_plugin_tv *tv) |
831 | { | |
832 | size_t i; | |
833 | ||
834 | /* Version info. */ | |
835 | static const unsigned int major = (unsigned)(BFD_VERSION / 100000000UL); | |
836 | static const unsigned int minor = (unsigned)(BFD_VERSION / 1000000UL) % 100; | |
837 | ||
5d3236ee DK |
838 | for (i = 0; i < tv_header_size; i++) |
839 | { | |
840 | tv[i].tv_tag = tv_header_tags[i]; | |
841 | #define TVU(x) tv[i].tv_u.tv_ ## x | |
842 | switch (tv[i].tv_tag) | |
843 | { | |
f84854b6 L |
844 | case LDPT_MESSAGE: |
845 | TVU(message) = message; | |
846 | break; | |
847 | case LDPT_API_VERSION: | |
848 | TVU(val) = LD_PLUGIN_API_VERSION; | |
849 | break; | |
850 | case LDPT_GNU_LD_VERSION: | |
851 | TVU(val) = major * 100 + minor; | |
852 | break; | |
853 | case LDPT_LINKER_OUTPUT: | |
854 | TVU(val) = (link_info.relocatable | |
855 | ? LDPO_REL | |
6611f2e1 L |
856 | : (link_info.executable |
857 | ? (link_info.pie ? LDPO_PIE : LDPO_EXEC) | |
858 | : LDPO_DYN)); | |
f84854b6 L |
859 | break; |
860 | case LDPT_OUTPUT_NAME: | |
861 | TVU(string) = output_filename; | |
862 | break; | |
863 | case LDPT_REGISTER_CLAIM_FILE_HOOK: | |
864 | TVU(register_claim_file) = register_claim_file; | |
865 | break; | |
866 | case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: | |
867 | TVU(register_all_symbols_read) = register_all_symbols_read; | |
868 | break; | |
869 | case LDPT_REGISTER_CLEANUP_HOOK: | |
870 | TVU(register_cleanup) = register_cleanup; | |
871 | break; | |
872 | case LDPT_ADD_SYMBOLS: | |
873 | TVU(add_symbols) = add_symbols; | |
874 | break; | |
875 | case LDPT_GET_INPUT_FILE: | |
876 | TVU(get_input_file) = get_input_file; | |
877 | break; | |
15f7a26b L |
878 | case LDPT_GET_VIEW: |
879 | TVU(get_view) = get_view; | |
880 | break; | |
f84854b6 L |
881 | case LDPT_RELEASE_INPUT_FILE: |
882 | TVU(release_input_file) = release_input_file; | |
883 | break; | |
884 | case LDPT_GET_SYMBOLS: | |
69ee6ab2 AM |
885 | TVU(get_symbols) = get_symbols_v1; |
886 | break; | |
887 | case LDPT_GET_SYMBOLS_V2: | |
888 | TVU(get_symbols) = get_symbols_v2; | |
f84854b6 L |
889 | break; |
890 | case LDPT_ADD_INPUT_FILE: | |
891 | TVU(add_input_file) = add_input_file; | |
892 | break; | |
893 | case LDPT_ADD_INPUT_LIBRARY: | |
894 | TVU(add_input_library) = add_input_library; | |
895 | break; | |
896 | case LDPT_SET_EXTRA_LIBRARY_PATH: | |
897 | TVU(set_extra_library_path) = set_extra_library_path; | |
898 | break; | |
899 | default: | |
900 | /* Added a new entry to the array without adding | |
901 | a new case to set up its value is a bug. */ | |
902 | FAIL (); | |
5d3236ee DK |
903 | } |
904 | #undef TVU | |
905 | } | |
5d3236ee DK |
906 | } |
907 | ||
908 | /* Append the per-plugin args list and trailing LDPT_NULL to tv. */ | |
909 | static void | |
910 | set_tv_plugin_args (plugin_t *plugin, struct ld_plugin_tv *tv) | |
911 | { | |
912 | plugin_arg_t *arg = plugin->args; | |
913 | while (arg) | |
914 | { | |
915 | tv->tv_tag = LDPT_OPTION; | |
916 | tv->tv_u.tv_string = arg->arg; | |
917 | arg = arg->next; | |
918 | tv++; | |
919 | } | |
920 | tv->tv_tag = LDPT_NULL; | |
921 | tv->tv_u.tv_val = 0; | |
922 | } | |
923 | ||
924 | /* Load up and initialise all plugins after argument parsing. */ | |
d82184d7 | 925 | void |
d44ad554 | 926 | plugin_load_plugins (void) |
5d3236ee DK |
927 | { |
928 | struct ld_plugin_tv *my_tv; | |
929 | unsigned int max_args = 0; | |
930 | plugin_t *curplug = plugins_list; | |
931 | ||
932 | /* If there are no plugins, we need do nothing this run. */ | |
933 | if (!curplug) | |
d82184d7 | 934 | return; |
5d3236ee DK |
935 | |
936 | /* First pass over plugins to find max # args needed so that we | |
937 | can size and allocate the tv array. */ | |
938 | while (curplug) | |
939 | { | |
940 | if (curplug->n_args > max_args) | |
941 | max_args = curplug->n_args; | |
942 | curplug = curplug->next; | |
943 | } | |
944 | ||
945 | /* Allocate tv array and initialise constant part. */ | |
946 | my_tv = xmalloc ((max_args + 1 + tv_header_size) * sizeof *my_tv); | |
947 | set_tv_header (my_tv); | |
948 | ||
949 | /* Pass over plugins again, activating them. */ | |
950 | curplug = plugins_list; | |
951 | while (curplug) | |
952 | { | |
953 | enum ld_plugin_status rv; | |
a8f9d13e AM |
954 | ld_plugin_onload onloadfn; |
955 | ||
956 | onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "onload"); | |
5d3236ee | 957 | if (!onloadfn) |
a8f9d13e | 958 | onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "_onload"); |
5d3236ee | 959 | if (!onloadfn) |
d82184d7 L |
960 | einfo (_("%P%F: %s: error loading plugin: %s\n"), |
961 | curplug->name, dlerror ()); | |
5d3236ee DK |
962 | set_tv_plugin_args (curplug, &my_tv[tv_header_size]); |
963 | called_plugin = curplug; | |
964 | rv = (*onloadfn) (my_tv); | |
965 | called_plugin = NULL; | |
966 | if (rv != LDPS_OK) | |
d82184d7 | 967 | einfo (_("%P%F: %s: plugin error: %d\n"), curplug->name, rv); |
5d3236ee DK |
968 | curplug = curplug->next; |
969 | } | |
970 | ||
971 | /* Since plugin(s) inited ok, assume they're going to want symbol | |
972 | resolutions, which needs us to track which symbols are referenced | |
973 | by non-IR files using the linker's notice callback. */ | |
9e2278f5 AM |
974 | orig_notice_all = link_info.notice_all; |
975 | orig_callbacks = link_info.callbacks; | |
976 | plugin_callbacks = *orig_callbacks; | |
977 | plugin_callbacks.notice = &plugin_notice; | |
5d3236ee | 978 | link_info.notice_all = TRUE; |
61f41c3c | 979 | link_info.lto_plugin_active = TRUE; |
9e2278f5 | 980 | link_info.callbacks = &plugin_callbacks; |
38604796 L |
981 | |
982 | #if HAVE_MMAP && HAVE_GETPAGESIZE | |
983 | plugin_pagesize = getpagesize ();; | |
984 | #endif | |
5d3236ee DK |
985 | } |
986 | ||
987 | /* Call 'claim file' hook for all plugins. */ | |
02d00247 | 988 | static int |
5d3236ee DK |
989 | plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed) |
990 | { | |
991 | plugin_t *curplug = plugins_list; | |
992 | *claimed = FALSE; | |
993 | if (no_more_claiming) | |
994 | return 0; | |
995 | while (curplug && !*claimed) | |
996 | { | |
997 | if (curplug->claim_file_handler) | |
998 | { | |
999 | enum ld_plugin_status rv; | |
1000 | called_plugin = curplug; | |
1001 | rv = (*curplug->claim_file_handler) (file, claimed); | |
1002 | called_plugin = NULL; | |
1003 | if (rv != LDPS_OK) | |
1004 | set_plugin_error (curplug->name); | |
1005 | } | |
1006 | curplug = curplug->next; | |
1007 | } | |
1008 | return plugin_error_p () ? -1 : 0; | |
1009 | } | |
1010 | ||
35a1e5f3 L |
1011 | /* Duplicates a character string with memory attached to ABFD. */ |
1012 | ||
1013 | static char * | |
1014 | plugin_strdup (bfd *abfd, const char *str) | |
1015 | { | |
1016 | size_t strlength; | |
1017 | char *copy; | |
1018 | strlength = strlen (str) + 1; | |
1019 | copy = bfd_alloc (abfd, strlength); | |
1020 | if (copy == NULL) | |
1021 | einfo (_("%P%F: plugin_strdup failed to allocate memory: %s\n"), | |
1022 | bfd_get_error ()); | |
1023 | memcpy (copy, str, strlength); | |
1024 | return copy; | |
1025 | } | |
1026 | ||
02d00247 | 1027 | void |
35a1e5f3 | 1028 | plugin_maybe_claim (lang_input_statement_type *entry) |
02d00247 AM |
1029 | { |
1030 | int claimed = 0; | |
f4b78d18 | 1031 | plugin_input_file_t *input; |
35a1e5f3 L |
1032 | off_t offset, filesize; |
1033 | struct ld_plugin_input_file file; | |
1034 | bfd *abfd; | |
1035 | bfd *ibfd = entry->the_bfd; | |
1036 | bfd_boolean inarchive = bfd_my_archive (ibfd) != NULL; | |
1037 | const char *name | |
1038 | = inarchive ? bfd_my_archive (ibfd)->filename : ibfd->filename; | |
1039 | int fd = open (name, O_RDONLY | O_BINARY); | |
1040 | ||
1041 | if (fd < 0) | |
1042 | return; | |
02d00247 AM |
1043 | |
1044 | /* We create a dummy BFD, initially empty, to house whatever symbols | |
1045 | the plugin may want to add. */ | |
35a1e5f3 | 1046 | abfd = plugin_get_ir_dummy_bfd (ibfd->filename, ibfd); |
f4b78d18 L |
1047 | |
1048 | input = bfd_alloc (abfd, sizeof (*input)); | |
1049 | if (input == NULL) | |
1050 | einfo (_("%P%F: plugin failed to allocate memory for input: %s\n"), | |
1051 | bfd_get_error ()); | |
1052 | ||
35a1e5f3 L |
1053 | if (inarchive) |
1054 | { | |
1055 | /* Offset and filesize must refer to the individual archive | |
1056 | member, not the whole file, and must exclude the header. | |
1057 | Fortunately for us, that is how the data is stored in the | |
1058 | origin field of the bfd and in the arelt_data. */ | |
1059 | offset = ibfd->origin; | |
1060 | filesize = arelt_size (ibfd); | |
1061 | } | |
1062 | else | |
1063 | { | |
1064 | offset = 0; | |
1065 | filesize = lseek (fd, 0, SEEK_END); | |
1066 | ||
1067 | /* We must copy filename attached to ibfd if it is not an archive | |
1068 | member since it may be freed by bfd_close below. */ | |
1069 | name = plugin_strdup (abfd, name); | |
1070 | } | |
1071 | ||
1072 | file.name = name; | |
1073 | file.offset = offset; | |
1074 | file.filesize = filesize; | |
1075 | file.fd = fd; | |
1076 | file.handle = input; | |
1077 | ||
f4b78d18 | 1078 | input->abfd = abfd; |
2aec968d L |
1079 | input->view_buffer.addr = NULL; |
1080 | input->view_buffer.filesize = 0; | |
1081 | input->view_buffer.offset = 0; | |
35a1e5f3 | 1082 | input->fd = fd; |
d319a098 | 1083 | input->use_mmap = FALSE; |
35a1e5f3 L |
1084 | input->offset = offset; |
1085 | input->filesize = filesize; | |
1086 | input->name = plugin_strdup (abfd, ibfd->filename); | |
f4b78d18 | 1087 | |
35a1e5f3 | 1088 | if (plugin_call_claim_file (&file, &claimed)) |
02d00247 AM |
1089 | einfo (_("%P%F: %s: plugin reported error claiming file\n"), |
1090 | plugin_error_plugin ()); | |
f4b78d18 | 1091 | |
e13419c4 | 1092 | if (input->fd != -1 && ibfd->format == bfd_object) |
f4b78d18 L |
1093 | { |
1094 | /* FIXME: fd belongs to us, not the plugin. IR for GCC plugin, | |
1095 | which doesn't need fd after plugin_call_claim_file, is | |
1096 | stored in bfd_object file. Since GCC plugin before GCC 5 | |
1097 | doesn't call release_input_file, we close it here. IR for | |
1098 | LLVM plugin, which needs fd after plugin_call_claim_file and | |
1099 | calls release_input_file after it is done, is stored in | |
1100 | non-bfd_object file. This scheme doesn't work when a plugin | |
1101 | needs fd and its IR is stored in bfd_object file. */ | |
35a1e5f3 | 1102 | close (fd); |
f4b78d18 L |
1103 | input->fd = -1; |
1104 | } | |
1105 | ||
02d00247 AM |
1106 | if (claimed) |
1107 | { | |
1108 | /* Discard the real file's BFD and substitute the dummy one. */ | |
1109 | ||
1110 | /* BFD archive handling caches elements so we can't call | |
1111 | bfd_close for archives. */ | |
35a1e5f3 L |
1112 | if (!inarchive) |
1113 | bfd_close (ibfd); | |
1114 | bfd_make_readable (abfd); | |
f4b78d18 | 1115 | entry->the_bfd = abfd; |
66be1055 | 1116 | entry->flags.claimed = TRUE; |
02d00247 AM |
1117 | } |
1118 | else | |
1119 | { | |
38604796 L |
1120 | #if HAVE_MMAP |
1121 | if (input->use_mmap) | |
1122 | { | |
1123 | /* If plugin didn't claim the file, unmap the buffer. */ | |
1124 | char *addr = input->view_buffer.addr; | |
1125 | off_t size = input->view_buffer.filesize; | |
1126 | # if HAVE_GETPAGESIZE | |
1127 | off_t bias = input->view_buffer.offset % plugin_pagesize; | |
1128 | size += bias; | |
1129 | addr -= bias; | |
1130 | # endif | |
1131 | munmap (addr, size); | |
1132 | } | |
1133 | #endif | |
1134 | ||
02d00247 AM |
1135 | /* If plugin didn't claim the file, we don't need the dummy bfd. |
1136 | Can't avoid speculatively creating it, alas. */ | |
f4b78d18 | 1137 | bfd_close_all_done (abfd); |
66be1055 | 1138 | entry->flags.claimed = FALSE; |
02d00247 AM |
1139 | } |
1140 | } | |
1141 | ||
5d3236ee DK |
1142 | /* Call 'all symbols read' hook for all plugins. */ |
1143 | int | |
1144 | plugin_call_all_symbols_read (void) | |
1145 | { | |
1146 | plugin_t *curplug = plugins_list; | |
1147 | ||
1148 | /* Disable any further file-claiming. */ | |
1149 | no_more_claiming = TRUE; | |
1150 | ||
5d3236ee DK |
1151 | while (curplug) |
1152 | { | |
1153 | if (curplug->all_symbols_read_handler) | |
1154 | { | |
1155 | enum ld_plugin_status rv; | |
1156 | called_plugin = curplug; | |
1157 | rv = (*curplug->all_symbols_read_handler) (); | |
1158 | called_plugin = NULL; | |
1159 | if (rv != LDPS_OK) | |
1160 | set_plugin_error (curplug->name); | |
1161 | } | |
1162 | curplug = curplug->next; | |
1163 | } | |
1164 | return plugin_error_p () ? -1 : 0; | |
1165 | } | |
1166 | ||
e73d965c | 1167 | /* Call 'cleanup' hook for all plugins at exit. */ |
498cd2a0 | 1168 | void |
5d3236ee DK |
1169 | plugin_call_cleanup (void) |
1170 | { | |
1171 | plugin_t *curplug = plugins_list; | |
1172 | while (curplug) | |
1173 | { | |
1174 | if (curplug->cleanup_handler && !curplug->cleanup_done) | |
1175 | { | |
1176 | enum ld_plugin_status rv; | |
1177 | curplug->cleanup_done = TRUE; | |
1178 | called_plugin = curplug; | |
1179 | rv = (*curplug->cleanup_handler) (); | |
1180 | called_plugin = NULL; | |
1181 | if (rv != LDPS_OK) | |
d82184d7 L |
1182 | info_msg (_("%P: %s: error in plugin cleanup: %d (ignored)\n"), |
1183 | curplug->name, rv); | |
5d3236ee DK |
1184 | dlclose (curplug->dlhandle); |
1185 | } | |
1186 | curplug = curplug->next; | |
1187 | } | |
5d3236ee DK |
1188 | } |
1189 | ||
5d3236ee DK |
1190 | /* To determine which symbols should be resolved LDPR_PREVAILING_DEF |
1191 | and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as | |
35ed3f94 AM |
1192 | the linker adds them to the linker hash table. Mark those |
1193 | referenced from a non-IR file with non_ir_ref. We have to | |
1194 | notice_all symbols, because we won't necessarily know until later | |
1195 | which ones will be contributed by IR files. */ | |
9e2278f5 AM |
1196 | static bfd_boolean |
1197 | plugin_notice (struct bfd_link_info *info, | |
35ed3f94 | 1198 | struct bfd_link_hash_entry *h, |
46135103 | 1199 | struct bfd_link_hash_entry *inh, |
9e2278f5 AM |
1200 | bfd *abfd, |
1201 | asection *section, | |
16d96b5b | 1202 | bfd_vma value, |
46135103 | 1203 | flagword flags) |
5d3236ee | 1204 | { |
46135103 AM |
1205 | struct bfd_link_hash_entry *orig_h = h; |
1206 | ||
35ed3f94 | 1207 | if (h != NULL) |
5d3236ee | 1208 | { |
cd6eee13 AM |
1209 | bfd *sym_bfd; |
1210 | ||
46135103 AM |
1211 | if (h->type == bfd_link_hash_warning) |
1212 | h = h->u.i.link; | |
1213 | ||
4a2b04a7 | 1214 | /* Nothing to do here if this def/ref is from an IR dummy BFD. */ |
9e2278f5 | 1215 | if (is_ir_dummy_bfd (abfd)) |
4a2b04a7 | 1216 | ; |
9e2278f5 | 1217 | |
16d96b5b AM |
1218 | /* Making an indirect symbol counts as a reference unless this |
1219 | is a brand new symbol. */ | |
4a2b04a7 L |
1220 | else if (bfd_is_ind_section (section) |
1221 | || (flags & BSF_INDIRECT) != 0) | |
16d96b5b | 1222 | { |
46135103 AM |
1223 | /* ??? Some of this is questionable. See comments in |
1224 | _bfd_generic_link_add_one_symbol for case IND. */ | |
16d96b5b AM |
1225 | if (h->type != bfd_link_hash_new) |
1226 | { | |
16d96b5b | 1227 | h->non_ir_ref = TRUE; |
46135103 | 1228 | inh->non_ir_ref = TRUE; |
16d96b5b | 1229 | } |
46135103 AM |
1230 | else if (inh->type == bfd_link_hash_new) |
1231 | inh->non_ir_ref = TRUE; | |
16d96b5b AM |
1232 | } |
1233 | ||
1234 | /* Nothing to do here for warning symbols. */ | |
1235 | else if ((flags & BSF_WARNING) != 0) | |
1236 | ; | |
1237 | ||
1238 | /* Nothing to do here for constructor symbols. */ | |
1239 | else if ((flags & BSF_CONSTRUCTOR) != 0) | |
1240 | ; | |
1241 | ||
35ed3f94 | 1242 | /* If this is a ref, set non_ir_ref. */ |
16d96b5b | 1243 | else if (bfd_is_und_section (section)) |
3d5bef4c L |
1244 | { |
1245 | /* Replace the undefined dummy bfd with the real one. */ | |
1246 | if ((h->type == bfd_link_hash_undefined | |
1247 | || h->type == bfd_link_hash_undefweak) | |
46fed7f7 SL |
1248 | && (h->u.undef.abfd == NULL |
1249 | || (h->u.undef.abfd->flags & BFD_PLUGIN) != 0)) | |
3d5bef4c L |
1250 | h->u.undef.abfd = abfd; |
1251 | h->non_ir_ref = TRUE; | |
1252 | } | |
35ed3f94 AM |
1253 | |
1254 | /* Otherwise, it must be a new def. Ensure any symbol defined | |
1255 | in an IR dummy BFD takes on a new value from a real BFD. | |
1256 | Weak symbols are not normally overridden by a new weak | |
1257 | definition, and strong symbols will normally cause multiple | |
1258 | definition errors. Avoid this by making the symbol appear | |
1259 | to be undefined. */ | |
1260 | else if (((h->type == bfd_link_hash_defweak | |
1261 | || h->type == bfd_link_hash_defined) | |
cd6eee13 | 1262 | && is_ir_dummy_bfd (sym_bfd = h->u.def.section->owner)) |
35ed3f94 | 1263 | || (h->type == bfd_link_hash_common |
cd6eee13 AM |
1264 | && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner))) |
1265 | { | |
1266 | h->type = bfd_link_hash_undefweak; | |
1267 | h->u.undef.abfd = sym_bfd; | |
1268 | } | |
5d3236ee DK |
1269 | } |
1270 | ||
1271 | /* Continue with cref/nocrossref/trace-sym processing. */ | |
46135103 | 1272 | if (orig_h == NULL |
9e2278f5 AM |
1273 | || orig_notice_all |
1274 | || (info->notice_hash != NULL | |
46135103 | 1275 | && bfd_hash_lookup (info->notice_hash, orig_h->root.string, |
35ed3f94 | 1276 | FALSE, FALSE) != NULL)) |
46135103 AM |
1277 | return (*orig_callbacks->notice) (info, orig_h, inh, |
1278 | abfd, section, value, flags); | |
5d3236ee DK |
1279 | return TRUE; |
1280 | } |