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5d3236ee | 1 | /* Plugin control for the GNU linker. |
a2c58332 | 2 | Copyright (C) 2010-2022 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" | |
0381901e | 24 | #if BFD_SUPPORTS_PLUGINS |
5d3236ee DK |
25 | #include "bfdlink.h" |
26 | #include "bfdver.h" | |
1ff6de03 | 27 | #include "ctf-api.h" |
5d3236ee DK |
28 | #include "ld.h" |
29 | #include "ldmain.h" | |
30 | #include "ldmisc.h" | |
31 | #include "ldexp.h" | |
32 | #include "ldlang.h" | |
33 | #include "ldfile.h" | |
7d0b9ebc | 34 | #include "plugin-api.h" |
5ae0078c | 35 | #include "../bfd/plugin.h" |
5d3236ee | 36 | #include "plugin.h" |
5d3236ee | 37 | #include "elf-bfd.h" |
2aec968d L |
38 | #if HAVE_MMAP |
39 | # include <sys/mman.h> | |
40 | # ifndef MAP_FAILED | |
41 | # define MAP_FAILED ((void *) -1) | |
42 | # endif | |
43 | # ifndef PROT_READ | |
44 | # define PROT_READ 0 | |
45 | # endif | |
46 | # ifndef MAP_PRIVATE | |
47 | # define MAP_PRIVATE 0 | |
48 | # endif | |
49 | #endif | |
f4b78d18 L |
50 | #include <errno.h> |
51 | #if !(defined(errno) || defined(_MSC_VER) && defined(_INC_ERRNO)) | |
52 | extern int errno; | |
53 | #endif | |
3917d5d5 | 54 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
f31d24a0 | 55 | #include <windows.h> |
3917d5d5 | 56 | #endif |
5d3236ee | 57 | |
1715a13c | 58 | /* Report plugin symbols. */ |
f38a2680 | 59 | bool report_plugin_symbols; |
1715a13c | 60 | |
5d3236ee DK |
61 | /* The suffix to append to the name of the real (claimed) object file |
62 | when generating a dummy BFD to hold the IR symbols sent from the | |
cf4dc96f DK |
63 | plugin. For cosmetic use only; appears in maps, crefs etc. */ |
64 | #define IRONLY_SUFFIX " (symbol from plugin)" | |
5d3236ee DK |
65 | |
66 | /* Stores a single argument passed to a plugin. */ | |
67 | typedef struct plugin_arg | |
68 | { | |
69 | struct plugin_arg *next; | |
70 | const char *arg; | |
71 | } plugin_arg_t; | |
72 | ||
73 | /* Holds all details of a single plugin. */ | |
74 | typedef struct plugin | |
75 | { | |
76 | /* Next on the list of plugins, or NULL at end of chain. */ | |
77 | struct plugin *next; | |
78 | /* The argument string given to --plugin. */ | |
79 | const char *name; | |
80 | /* The shared library handle returned by dlopen. */ | |
81 | void *dlhandle; | |
82 | /* The list of argument string given to --plugin-opt. */ | |
83 | plugin_arg_t *args; | |
84 | /* Number of args in the list, for convenience. */ | |
85 | size_t n_args; | |
86 | /* The plugin's event handlers. */ | |
87 | ld_plugin_claim_file_handler claim_file_handler; | |
88 | ld_plugin_all_symbols_read_handler all_symbols_read_handler; | |
89 | ld_plugin_cleanup_handler cleanup_handler; | |
90 | /* TRUE if the cleanup handlers have been called. */ | |
f38a2680 | 91 | bool cleanup_done; |
5d3236ee DK |
92 | } plugin_t; |
93 | ||
2aec968d L |
94 | typedef struct view_buffer |
95 | { | |
96 | char *addr; | |
97 | size_t filesize; | |
98 | off_t offset; | |
99 | } view_buffer_t; | |
100 | ||
f4b78d18 L |
101 | /* The internal version of struct ld_plugin_input_file with a BFD |
102 | pointer. */ | |
103 | typedef struct plugin_input_file | |
104 | { | |
7a30ac44 | 105 | /* The dummy BFD. */ |
f4b78d18 | 106 | bfd *abfd; |
7a30ac44 | 107 | /* The original input BFD. Non-NULL if it is an archive member. */ |
91817247 | 108 | bfd *ibfd; |
2aec968d | 109 | view_buffer_t view_buffer; |
f4b78d18 L |
110 | char *name; |
111 | int fd; | |
f38a2680 | 112 | bool use_mmap; |
f4b78d18 L |
113 | off_t offset; |
114 | off_t filesize; | |
115 | } plugin_input_file_t; | |
116 | ||
5d3236ee DK |
117 | /* The master list of all plugins. */ |
118 | static plugin_t *plugins_list = NULL; | |
119 | ||
120 | /* We keep a tail pointer for easy linking on the end. */ | |
121 | static plugin_t **plugins_tail_chain_ptr = &plugins_list; | |
122 | ||
123 | /* The last plugin added to the list, for receiving args. */ | |
124 | static plugin_t *last_plugin = NULL; | |
125 | ||
126 | /* The tail of the arg chain of the last plugin added to the list. */ | |
127 | static plugin_arg_t **last_plugin_args_tail_chain_ptr = NULL; | |
128 | ||
129 | /* The plugin which is currently having a callback executed. */ | |
130 | static plugin_t *called_plugin = NULL; | |
131 | ||
132 | /* Last plugin to cause an error, if any. */ | |
133 | static const char *error_plugin = NULL; | |
134 | ||
24f58f47 | 135 | /* State of linker "notice" interface before we poked at it. */ |
f38a2680 | 136 | static bool orig_notice_all; |
9e2278f5 AM |
137 | |
138 | /* Original linker callbacks, and the plugin version. */ | |
139 | static const struct bfd_link_callbacks *orig_callbacks; | |
140 | static struct bfd_link_callbacks plugin_callbacks; | |
141 | ||
5d3236ee DK |
142 | /* Set at all symbols read time, to avoid recursively offering the plugin |
143 | its own newly-added input files and libs to claim. */ | |
f38a2680 | 144 | bool no_more_claiming = false; |
5d3236ee | 145 | |
38604796 L |
146 | #if HAVE_MMAP && HAVE_GETPAGESIZE |
147 | /* Page size used by mmap. */ | |
148 | static off_t plugin_pagesize; | |
149 | #endif | |
150 | ||
5d3236ee DK |
151 | /* List of tags to set in the constant leading part of the tv array. */ |
152 | static const enum ld_plugin_tag tv_header_tags[] = | |
153 | { | |
154 | LDPT_MESSAGE, | |
155 | LDPT_API_VERSION, | |
156 | LDPT_GNU_LD_VERSION, | |
157 | LDPT_LINKER_OUTPUT, | |
158 | LDPT_OUTPUT_NAME, | |
159 | LDPT_REGISTER_CLAIM_FILE_HOOK, | |
160 | LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK, | |
161 | LDPT_REGISTER_CLEANUP_HOOK, | |
162 | LDPT_ADD_SYMBOLS, | |
163 | LDPT_GET_INPUT_FILE, | |
15f7a26b | 164 | LDPT_GET_VIEW, |
5d3236ee DK |
165 | LDPT_RELEASE_INPUT_FILE, |
166 | LDPT_GET_SYMBOLS, | |
69ee6ab2 | 167 | LDPT_GET_SYMBOLS_V2, |
5d3236ee DK |
168 | LDPT_ADD_INPUT_FILE, |
169 | LDPT_ADD_INPUT_LIBRARY, | |
170 | LDPT_SET_EXTRA_LIBRARY_PATH | |
171 | }; | |
172 | ||
173 | /* How many entries in the constant leading part of the tv array. */ | |
174 | static const size_t tv_header_size = ARRAY_SIZE (tv_header_tags); | |
175 | ||
9e2278f5 | 176 | /* Forward references. */ |
f38a2680 AM |
177 | static bool plugin_notice (struct bfd_link_info *, |
178 | struct bfd_link_hash_entry *, | |
179 | struct bfd_link_hash_entry *, | |
180 | bfd *, asection *, bfd_vma, flagword); | |
9e2278f5 | 181 | |
cb001c0d | 182 | static bfd_cleanup plugin_object_p (bfd *); |
5ae0078c | 183 | |
3917d5d5 DK |
184 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
185 | ||
186 | #define RTLD_NOW 0 /* Dummy value. */ | |
187 | ||
188 | static void * | |
189 | dlopen (const char *file, int mode ATTRIBUTE_UNUSED) | |
190 | { | |
191 | return LoadLibrary (file); | |
192 | } | |
193 | ||
194 | static void * | |
195 | dlsym (void *handle, const char *name) | |
196 | { | |
197 | return GetProcAddress (handle, name); | |
198 | } | |
199 | ||
200 | static int | |
201 | dlclose (void *handle) | |
202 | { | |
203 | FreeLibrary (handle); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */ | |
208 | ||
d82184d7 L |
209 | #ifndef HAVE_DLFCN_H |
210 | static const char * | |
211 | dlerror (void) | |
212 | { | |
213 | return ""; | |
214 | } | |
215 | #endif | |
216 | ||
5d3236ee DK |
217 | /* Helper function for exiting with error status. */ |
218 | static int | |
219 | set_plugin_error (const char *plugin) | |
220 | { | |
221 | error_plugin = plugin; | |
222 | return -1; | |
223 | } | |
224 | ||
225 | /* Test if an error occurred. */ | |
f38a2680 | 226 | static bool |
5d3236ee DK |
227 | plugin_error_p (void) |
228 | { | |
229 | return error_plugin != NULL; | |
230 | } | |
231 | ||
232 | /* Return name of plugin which caused an error if any. */ | |
d44ad554 DK |
233 | const char * |
234 | plugin_error_plugin (void) | |
5d3236ee DK |
235 | { |
236 | return error_plugin ? error_plugin : _("<no plugin>"); | |
237 | } | |
238 | ||
239 | /* Handle -plugin arg: find and load plugin, or return error. */ | |
d82184d7 | 240 | void |
d44ad554 | 241 | plugin_opt_plugin (const char *plugin) |
5d3236ee DK |
242 | { |
243 | plugin_t *newplug; | |
c3e1c28e | 244 | plugin_t *curplug = plugins_list; |
5d3236ee DK |
245 | |
246 | newplug = xmalloc (sizeof *newplug); | |
247 | memset (newplug, 0, sizeof *newplug); | |
248 | newplug->name = plugin; | |
249 | newplug->dlhandle = dlopen (plugin, RTLD_NOW); | |
250 | if (!newplug->dlhandle) | |
df5f2391 | 251 | einfo (_("%F%P: %s: error loading plugin: %s\n"), plugin, dlerror ()); |
5d3236ee | 252 | |
c3e1c28e L |
253 | /* Check if plugin has been loaded already. */ |
254 | while (curplug) | |
255 | { | |
256 | if (newplug->dlhandle == curplug->dlhandle) | |
257 | { | |
258 | einfo (_("%P: %s: duplicated plugin\n"), plugin); | |
259 | free (newplug); | |
260 | return; | |
261 | } | |
262 | curplug = curplug->next; | |
263 | } | |
264 | ||
5d3236ee DK |
265 | /* Chain on end, so when we run list it is in command-line order. */ |
266 | *plugins_tail_chain_ptr = newplug; | |
267 | plugins_tail_chain_ptr = &newplug->next; | |
268 | ||
269 | /* Record it as current plugin for receiving args. */ | |
270 | last_plugin = newplug; | |
271 | last_plugin_args_tail_chain_ptr = &newplug->args; | |
5d3236ee DK |
272 | } |
273 | ||
274 | /* Accumulate option arguments for last-loaded plugin, or return | |
275 | error if none. */ | |
d44ad554 DK |
276 | int |
277 | plugin_opt_plugin_arg (const char *arg) | |
5d3236ee DK |
278 | { |
279 | plugin_arg_t *newarg; | |
280 | ||
281 | if (!last_plugin) | |
282 | return set_plugin_error (_("<no plugin>")); | |
283 | ||
97964ab3 AM |
284 | /* Ignore -pass-through= from GCC driver. */ |
285 | if (*arg == '-') | |
286 | { | |
287 | const char *p = arg + 1; | |
288 | ||
289 | if (*p == '-') | |
290 | ++p; | |
291 | if (strncmp (p, "pass-through=", 13) == 0) | |
292 | return 0; | |
293 | } | |
294 | ||
5d3236ee DK |
295 | newarg = xmalloc (sizeof *newarg); |
296 | newarg->arg = arg; | |
297 | newarg->next = NULL; | |
298 | ||
299 | /* Chain on end to preserve command-line order. */ | |
300 | *last_plugin_args_tail_chain_ptr = newarg; | |
301 | last_plugin_args_tail_chain_ptr = &newarg->next; | |
302 | last_plugin->n_args++; | |
303 | return 0; | |
304 | } | |
305 | ||
37a3056a L |
306 | /* Generate a dummy BFD to represent an IR file, for any callers of |
307 | plugin_call_claim_file to use as the handle in the ld_plugin_input_file | |
308 | struct that they build to pass in. The BFD is initially writable, so | |
309 | that symbols can be added to it; it must be made readable after the | |
310 | add_symbols hook has been called so that it can be read when linking. */ | |
311 | static bfd * | |
5d3236ee DK |
312 | plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate) |
313 | { | |
bc110b6e | 314 | bfd *abfd; |
f38a2680 | 315 | bool bfd_plugin_target; |
bc110b6e AM |
316 | |
317 | bfd_use_reserved_id = 1; | |
4a07dc81 | 318 | bfd_plugin_target = bfd_plugin_target_p (srctemplate->xvec); |
9e2278f5 | 319 | abfd = bfd_create (concat (name, IRONLY_SUFFIX, (const char *) NULL), |
4a07dc81 | 320 | bfd_plugin_target ? link_info.output_bfd : srctemplate); |
9e2278f5 AM |
321 | if (abfd != NULL) |
322 | { | |
323 | abfd->flags |= BFD_LINKER_CREATED | BFD_PLUGIN; | |
5ae0078c L |
324 | if (!bfd_make_writable (abfd)) |
325 | goto report_error; | |
4a07dc81 | 326 | if (!bfd_plugin_target) |
5ae0078c L |
327 | { |
328 | bfd_set_arch_info (abfd, bfd_get_arch_info (srctemplate)); | |
329 | bfd_set_gp_size (abfd, bfd_get_gp_size (srctemplate)); | |
330 | if (!bfd_copy_private_bfd_data (srctemplate, abfd)) | |
331 | goto report_error; | |
332 | } | |
9e2278f5 AM |
333 | { |
334 | flagword flags; | |
335 | ||
c77ec726 | 336 | /* Create section to own the symbols. */ |
9e2278f5 AM |
337 | flags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY |
338 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE); | |
339 | if (bfd_make_section_anyway_with_flags (abfd, ".text", flags)) | |
340 | return abfd; | |
341 | } | |
342 | } | |
dc1e8a47 | 343 | report_error: |
df5f2391 | 344 | einfo (_("%F%P: could not create dummy IR bfd: %E\n")); |
9e2278f5 | 345 | return NULL; |
5d3236ee DK |
346 | } |
347 | ||
d44ad554 | 348 | /* Check if the BFD passed in is an IR dummy object file. */ |
f38a2680 | 349 | static inline bool |
5d3236ee DK |
350 | is_ir_dummy_bfd (const bfd *abfd) |
351 | { | |
cf4dc96f | 352 | /* ABFD can sometimes legitimately be NULL, e.g. when called from one |
23ebe1a0 AM |
353 | of the linker callbacks for a symbol in the *ABS* or *UND* sections. */ |
354 | return abfd != NULL && (abfd->flags & BFD_PLUGIN) != 0; | |
5d3236ee DK |
355 | } |
356 | ||
357 | /* Helpers to convert between BFD and GOLD symbol formats. */ | |
358 | static enum ld_plugin_status | |
359 | asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, | |
f84854b6 | 360 | const struct ld_plugin_symbol *ldsym) |
5d3236ee DK |
361 | { |
362 | flagword flags = BSF_NO_FLAGS; | |
363 | struct bfd_section *section; | |
364 | ||
365 | asym->the_bfd = abfd; | |
f84854b6 | 366 | asym->name = (ldsym->version |
9e2278f5 | 367 | ? concat (ldsym->name, "@", ldsym->version, (const char *) NULL) |
f84854b6 | 368 | : ldsym->name); |
5d3236ee DK |
369 | asym->value = 0; |
370 | switch (ldsym->def) | |
371 | { | |
372 | case LDPK_WEAKDEF: | |
373 | flags = BSF_WEAK; | |
374 | /* FALLTHRU */ | |
375 | case LDPK_DEF: | |
376 | flags |= BSF_GLOBAL; | |
c77ec726 AM |
377 | if (ldsym->comdat_key) |
378 | { | |
379 | char *name = concat (".gnu.linkonce.t.", ldsym->comdat_key, | |
380 | (const char *) NULL); | |
381 | section = bfd_get_section_by_name (abfd, name); | |
382 | if (section != NULL) | |
383 | free (name); | |
384 | else | |
385 | { | |
386 | flagword sflags; | |
387 | ||
388 | sflags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY | |
389 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE | |
390 | | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD); | |
391 | section = bfd_make_section_anyway_with_flags (abfd, name, sflags); | |
392 | if (section == NULL) | |
393 | return LDPS_ERR; | |
394 | } | |
395 | } | |
396 | else | |
397 | section = bfd_get_section_by_name (abfd, ".text"); | |
5d3236ee DK |
398 | break; |
399 | ||
400 | case LDPK_WEAKUNDEF: | |
401 | flags = BSF_WEAK; | |
402 | /* FALLTHRU */ | |
403 | case LDPK_UNDEF: | |
404 | section = bfd_und_section_ptr; | |
405 | break; | |
406 | ||
407 | case LDPK_COMMON: | |
408 | flags = BSF_GLOBAL; | |
409 | section = bfd_com_section_ptr; | |
410 | asym->value = ldsym->size; | |
411 | break; | |
412 | ||
413 | default: | |
414 | return LDPS_ERR; | |
415 | } | |
416 | asym->flags = flags; | |
417 | asym->section = section; | |
418 | ||
5d3236ee DK |
419 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
420 | { | |
c1229f84 | 421 | elf_symbol_type *elfsym = elf_symbol_from (asym); |
cfac8028 L |
422 | unsigned char visibility; |
423 | ||
5d3236ee | 424 | if (!elfsym) |
df5f2391 | 425 | einfo (_("%F%P: %s: non-ELF symbol in ELF BFD!\n"), asym->name); |
0410b450 AM |
426 | |
427 | if (ldsym->def == LDPK_COMMON) | |
428 | { | |
429 | elfsym->internal_elf_sym.st_shndx = SHN_COMMON; | |
430 | elfsym->internal_elf_sym.st_value = 1; | |
431 | } | |
432 | ||
cfac8028 L |
433 | switch (ldsym->visibility) |
434 | { | |
435 | default: | |
df5f2391 | 436 | einfo (_("%F%P: unknown ELF symbol visibility: %d!\n"), |
cfac8028 | 437 | ldsym->visibility); |
2b804145 AM |
438 | return LDPS_ERR; |
439 | ||
cfac8028 L |
440 | case LDPV_DEFAULT: |
441 | visibility = STV_DEFAULT; | |
442 | break; | |
443 | case LDPV_PROTECTED: | |
444 | visibility = STV_PROTECTED; | |
445 | break; | |
446 | case LDPV_INTERNAL: | |
447 | visibility = STV_INTERNAL; | |
448 | break; | |
449 | case LDPV_HIDDEN: | |
450 | visibility = STV_HIDDEN; | |
451 | break; | |
452 | } | |
0410b450 | 453 | elfsym->internal_elf_sym.st_other |= visibility; |
5d3236ee DK |
454 | } |
455 | ||
456 | return LDPS_OK; | |
457 | } | |
458 | ||
459 | /* Register a claim-file handler. */ | |
460 | static enum ld_plugin_status | |
461 | register_claim_file (ld_plugin_claim_file_handler handler) | |
462 | { | |
463 | ASSERT (called_plugin); | |
464 | called_plugin->claim_file_handler = handler; | |
465 | return LDPS_OK; | |
466 | } | |
467 | ||
468 | /* Register an all-symbols-read handler. */ | |
469 | static enum ld_plugin_status | |
470 | register_all_symbols_read (ld_plugin_all_symbols_read_handler handler) | |
471 | { | |
472 | ASSERT (called_plugin); | |
473 | called_plugin->all_symbols_read_handler = handler; | |
474 | return LDPS_OK; | |
475 | } | |
476 | ||
477 | /* Register a cleanup handler. */ | |
478 | static enum ld_plugin_status | |
479 | register_cleanup (ld_plugin_cleanup_handler handler) | |
480 | { | |
481 | ASSERT (called_plugin); | |
482 | called_plugin->cleanup_handler = handler; | |
483 | return LDPS_OK; | |
484 | } | |
485 | ||
486 | /* Add symbols from a plugin-claimed input file. */ | |
487 | static enum ld_plugin_status | |
488 | add_symbols (void *handle, int nsyms, const struct ld_plugin_symbol *syms) | |
489 | { | |
490 | asymbol **symptrs; | |
f4b78d18 L |
491 | plugin_input_file_t *input = handle; |
492 | bfd *abfd = input->abfd; | |
7fe550fc | 493 | int n; |
43e1669b | 494 | |
5d3236ee DK |
495 | ASSERT (called_plugin); |
496 | symptrs = xmalloc (nsyms * sizeof *symptrs); | |
7fe550fc | 497 | for (n = 0; n < nsyms; n++) |
5d3236ee DK |
498 | { |
499 | enum ld_plugin_status rv; | |
0c511000 AM |
500 | asymbol *bfdsym; |
501 | ||
0c511000 | 502 | bfdsym = bfd_make_empty_symbol (abfd); |
7fe550fc | 503 | symptrs[n] = bfdsym; |
5d3236ee DK |
504 | rv = asymbol_from_plugin_symbol (abfd, bfdsym, syms + n); |
505 | if (rv != LDPS_OK) | |
506 | return rv; | |
507 | } | |
7fe550fc | 508 | bfd_set_symtab (abfd, symptrs, nsyms); |
5d3236ee DK |
509 | return LDPS_OK; |
510 | } | |
511 | ||
512 | /* Get the input file information with an open (possibly re-opened) | |
513 | file descriptor. */ | |
514 | static enum ld_plugin_status | |
f4b78d18 | 515 | get_input_file (const void *handle, struct ld_plugin_input_file *file) |
5d3236ee | 516 | { |
f4b78d18 L |
517 | const plugin_input_file_t *input = handle; |
518 | ||
5d3236ee | 519 | ASSERT (called_plugin); |
f4b78d18 L |
520 | |
521 | file->name = input->name; | |
522 | file->offset = input->offset; | |
523 | file->filesize = input->filesize; | |
524 | file->handle = (void *) handle; | |
525 | ||
526 | return LDPS_OK; | |
5d3236ee DK |
527 | } |
528 | ||
15f7a26b L |
529 | /* Get view of the input file. */ |
530 | static enum ld_plugin_status | |
f4b78d18 | 531 | get_view (const void *handle, const void **viewp) |
15f7a26b | 532 | { |
2aec968d | 533 | plugin_input_file_t *input = (plugin_input_file_t *) handle; |
f4b78d18 | 534 | char *buffer; |
2aec968d | 535 | size_t size = input->filesize; |
38604796 L |
536 | off_t offset = input->offset; |
537 | #if HAVE_MMAP && HAVE_GETPAGESIZE | |
538 | off_t bias; | |
fe905789 | 539 | #endif |
f4b78d18 | 540 | |
15f7a26b | 541 | ASSERT (called_plugin); |
f4b78d18 | 542 | |
2aec968d L |
543 | /* FIXME: einfo should support %lld. */ |
544 | if ((off_t) size != input->filesize) | |
df5f2391 | 545 | einfo (_("%F%P: unsupported input file size: %s (%ld bytes)\n"), |
2aec968d | 546 | input->name, (long) input->filesize); |
f4b78d18 | 547 | |
2aec968d L |
548 | /* Check the cached view buffer. */ |
549 | if (input->view_buffer.addr != NULL | |
550 | && input->view_buffer.filesize == size | |
38604796 | 551 | && input->view_buffer.offset == offset) |
2aec968d L |
552 | { |
553 | *viewp = input->view_buffer.addr; | |
554 | return LDPS_OK; | |
555 | } | |
556 | ||
557 | input->view_buffer.filesize = size; | |
38604796 | 558 | input->view_buffer.offset = offset; |
f4b78d18 | 559 | |
2aec968d | 560 | #if HAVE_MMAP |
fe905789 | 561 | # if HAVE_GETPAGESIZE |
38604796 L |
562 | bias = offset % plugin_pagesize; |
563 | offset -= bias; | |
fe905789 L |
564 | size += bias; |
565 | # endif | |
566 | buffer = mmap (NULL, size, PROT_READ, MAP_PRIVATE, input->fd, offset); | |
567 | if (buffer != MAP_FAILED) | |
38604796 | 568 | { |
f38a2680 | 569 | input->use_mmap = true; |
38604796 L |
570 | # if HAVE_GETPAGESIZE |
571 | buffer += bias; | |
b677c456 | 572 | # endif |
38604796 L |
573 | } |
574 | else | |
2aec968d | 575 | #endif |
f4b78d18 | 576 | { |
2aec968d L |
577 | char *p; |
578 | ||
f38a2680 | 579 | input->use_mmap = false; |
38604796 L |
580 | |
581 | if (lseek (input->fd, offset, SEEK_SET) < 0) | |
2aec968d L |
582 | return LDPS_ERR; |
583 | ||
584 | buffer = bfd_alloc (input->abfd, size); | |
585 | if (buffer == NULL) | |
586 | return LDPS_ERR; | |
587 | ||
588 | p = buffer; | |
589 | do | |
f4b78d18 | 590 | { |
2aec968d L |
591 | ssize_t got = read (input->fd, p, size); |
592 | if (got == 0) | |
593 | break; | |
594 | else if (got > 0) | |
595 | { | |
596 | p += got; | |
597 | size -= got; | |
598 | } | |
599 | else if (errno != EINTR) | |
600 | return LDPS_ERR; | |
f4b78d18 | 601 | } |
2aec968d | 602 | while (size > 0); |
f4b78d18 | 603 | } |
2aec968d L |
604 | |
605 | input->view_buffer.addr = buffer; | |
606 | *viewp = buffer; | |
f4b78d18 L |
607 | |
608 | return LDPS_OK; | |
15f7a26b L |
609 | } |
610 | ||
91817247 L |
611 | /* Release plugin file descriptor. */ |
612 | ||
613 | static void | |
614 | release_plugin_file_descriptor (plugin_input_file_t *input) | |
615 | { | |
616 | if (input->fd != -1) | |
617 | { | |
618 | bfd_plugin_close_file_descriptor (input->ibfd, input->fd); | |
619 | input->fd = -1; | |
620 | } | |
621 | } | |
622 | ||
5d3236ee DK |
623 | /* Release the input file. */ |
624 | static enum ld_plugin_status | |
f4b78d18 | 625 | release_input_file (const void *handle) |
5d3236ee | 626 | { |
119d62ff | 627 | plugin_input_file_t *input = (plugin_input_file_t *) handle; |
5d3236ee | 628 | ASSERT (called_plugin); |
91817247 | 629 | release_plugin_file_descriptor (input); |
f4b78d18 | 630 | return LDPS_OK; |
5d3236ee DK |
631 | } |
632 | ||
42a851a9 DK |
633 | /* Return TRUE if a defined symbol might be reachable from outside the |
634 | universe of claimed objects. */ | |
f38a2680 | 635 | static inline bool |
9bbc1a67 | 636 | is_visible_from_outside (struct ld_plugin_symbol *lsym, |
f84854b6 | 637 | struct bfd_link_hash_entry *blhe) |
42a851a9 | 638 | { |
0e1862bb | 639 | if (bfd_link_relocatable (&link_info)) |
f38a2680 | 640 | return true; |
4070765b | 641 | if (blhe->non_ir_ref_dynamic |
59fa66c5 L |
642 | || link_info.export_dynamic |
643 | || bfd_link_dll (&link_info)) | |
42a851a9 | 644 | { |
fd91d419 L |
645 | /* Check if symbol is hidden by version script. */ |
646 | if (bfd_hide_sym_by_version (link_info.version_info, | |
647 | blhe->root.string)) | |
f38a2680 | 648 | return false; |
42a851a9 | 649 | /* Only ELF symbols really have visibility. */ |
fc304b88 | 650 | if (is_elf_hash_table (link_info.hash)) |
42a851a9 DK |
651 | { |
652 | struct elf_link_hash_entry *el = (struct elf_link_hash_entry *)blhe; | |
653 | int vis = ELF_ST_VISIBILITY (el->other); | |
654 | return vis == STV_DEFAULT || vis == STV_PROTECTED; | |
655 | } | |
656 | /* On non-ELF targets, we can safely make inferences by considering | |
f84854b6 | 657 | what visibility the plugin would have liked to apply when it first |
42a851a9 DK |
658 | sent us the symbol. During ELF symbol processing, visibility only |
659 | ever becomes more restrictive, not less, when symbols are merged, | |
660 | so this is a conservative estimate; it may give false positives, | |
661 | declaring something visible from outside when it in fact would | |
662 | not have been, but this will only lead to missed optimisation | |
663 | opportunities during LTRANS at worst; it will not give false | |
664 | negatives, which can lead to the disastrous conclusion that the | |
665 | related symbol is IRONLY. (See GCC PR46319 for an example.) */ | |
cfac8028 L |
666 | return (lsym->visibility == LDPV_DEFAULT |
667 | || lsym->visibility == LDPV_PROTECTED); | |
42a851a9 | 668 | } |
35ed3f94 | 669 | |
f38a2680 | 670 | return false; |
42a851a9 DK |
671 | } |
672 | ||
8e5cb9a5 | 673 | /* Return LTO kind string name that corresponds to IDX enum value. */ |
7ea79cb3 | 674 | static const char * |
8e5cb9a5 | 675 | get_lto_kind (unsigned int idx) |
7ea79cb3 | 676 | { |
677 | static char buffer[64]; | |
678 | const char *lto_kind_str[5] = | |
679 | { | |
680 | "DEF", | |
681 | "WEAKDEF", | |
682 | "UNDEF", | |
683 | "WEAKUNDEF", | |
684 | "COMMON" | |
685 | }; | |
686 | ||
8e5cb9a5 JB |
687 | if (idx < ARRAY_SIZE (lto_kind_str)) |
688 | return lto_kind_str [idx]; | |
7ea79cb3 | 689 | |
8e5cb9a5 | 690 | sprintf (buffer, _("unknown LTO kind value %x"), idx); |
7ea79cb3 | 691 | return buffer; |
692 | } | |
693 | ||
8e5cb9a5 | 694 | /* Return LTO resolution string name that corresponds to IDX enum value. */ |
7ea79cb3 | 695 | static const char * |
8e5cb9a5 | 696 | get_lto_resolution (unsigned int idx) |
7ea79cb3 | 697 | { |
698 | static char buffer[64]; | |
699 | static const char *lto_resolution_str[10] = | |
700 | { | |
701 | "UNKNOWN", | |
702 | "UNDEF", | |
703 | "PREVAILING_DEF", | |
704 | "PREVAILING_DEF_IRONLY", | |
705 | "PREEMPTED_REG", | |
706 | "PREEMPTED_IR", | |
707 | "RESOLVED_IR", | |
708 | "RESOLVED_EXEC", | |
709 | "RESOLVED_DYN", | |
710 | "PREVAILING_DEF_IRONLY_EXP", | |
711 | }; | |
712 | ||
8e5cb9a5 JB |
713 | if (idx < ARRAY_SIZE (lto_resolution_str)) |
714 | return lto_resolution_str [idx]; | |
7ea79cb3 | 715 | |
8e5cb9a5 | 716 | sprintf (buffer, _("unknown LTO resolution value %x"), idx); |
7ea79cb3 | 717 | return buffer; |
718 | } | |
719 | ||
8e5cb9a5 | 720 | /* Return LTO visibility string name that corresponds to IDX enum value. */ |
7ea79cb3 | 721 | static const char * |
8e5cb9a5 | 722 | get_lto_visibility (unsigned int idx) |
7ea79cb3 | 723 | { |
724 | static char buffer[64]; | |
725 | const char *lto_visibility_str[4] = | |
726 | { | |
727 | "DEFAULT", | |
728 | "PROTECTED", | |
729 | "INTERNAL", | |
730 | "HIDDEN" | |
731 | }; | |
732 | ||
8e5cb9a5 JB |
733 | if (idx < ARRAY_SIZE (lto_visibility_str)) |
734 | return lto_visibility_str [idx]; | |
7ea79cb3 | 735 | |
8e5cb9a5 | 736 | sprintf (buffer, _("unknown LTO visibility value %x"), idx); |
7ea79cb3 | 737 | return buffer; |
738 | } | |
739 | ||
5d3236ee DK |
740 | /* Get the symbol resolution info for a plugin-claimed input file. */ |
741 | static enum ld_plugin_status | |
69ee6ab2 AM |
742 | get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms, |
743 | int def_ironly_exp) | |
5d3236ee | 744 | { |
f4b78d18 L |
745 | const plugin_input_file_t *input = handle; |
746 | const bfd *abfd = (const bfd *) input->abfd; | |
5d3236ee | 747 | int n; |
69ee6ab2 | 748 | |
5d3236ee DK |
749 | ASSERT (called_plugin); |
750 | for (n = 0; n < nsyms; n++) | |
751 | { | |
752 | struct bfd_link_hash_entry *blhe; | |
42a851a9 | 753 | asection *owner_sec; |
69ee6ab2 | 754 | int res; |
6fe014bc L |
755 | struct bfd_link_hash_entry *h |
756 | = bfd_link_hash_lookup (link_info.hash, syms[n].name, | |
f38a2680 | 757 | false, false, true); |
6fe014bc | 758 | enum { wrap_none, wrapper, wrapped } wrap_status = wrap_none; |
69ee6ab2 | 759 | |
6fe014bc L |
760 | if (syms[n].def != LDPK_UNDEF && syms[n].def != LDPK_WEAKUNDEF) |
761 | { | |
762 | blhe = h; | |
a78fca7b | 763 | if (blhe && link_info.wrap_hash != NULL) |
6fe014bc L |
764 | { |
765 | /* Check if a symbol is a wrapper symbol. */ | |
766 | struct bfd_link_hash_entry *unwrap | |
767 | = unwrap_hash_lookup (&link_info, (bfd *) abfd, blhe); | |
768 | if (unwrap && unwrap != h) | |
769 | wrap_status = wrapper; | |
770 | } | |
771 | } | |
10be1b6a | 772 | else |
6fe014bc L |
773 | { |
774 | blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, | |
775 | &link_info, syms[n].name, | |
f38a2680 | 776 | false, false, true); |
6fe014bc L |
777 | /* Check if a symbol is a wrapped symbol. */ |
778 | if (blhe && blhe != h) | |
779 | wrap_status = wrapped; | |
780 | } | |
5d3236ee DK |
781 | if (!blhe) |
782 | { | |
3355cb3b L |
783 | /* The plugin is called to claim symbols in an archive element |
784 | from plugin_object_p. But those symbols aren't needed to | |
785 | create output. They are defined and referenced only within | |
786 | IR. */ | |
787 | switch (syms[n].def) | |
788 | { | |
789 | default: | |
790 | abort (); | |
791 | case LDPK_UNDEF: | |
792 | case LDPK_WEAKUNDEF: | |
793 | res = LDPR_UNDEF; | |
794 | break; | |
795 | case LDPK_DEF: | |
796 | case LDPK_WEAKDEF: | |
797 | case LDPK_COMMON: | |
798 | res = LDPR_PREVAILING_DEF_IRONLY; | |
799 | break; | |
800 | } | |
1715a13c | 801 | goto report_symbol; |
5d3236ee DK |
802 | } |
803 | ||
804 | /* Determine resolution from blhe type and symbol's original type. */ | |
805 | if (blhe->type == bfd_link_hash_undefined | |
f84854b6 | 806 | || blhe->type == bfd_link_hash_undefweak) |
5d3236ee | 807 | { |
69ee6ab2 | 808 | res = LDPR_UNDEF; |
1715a13c | 809 | goto report_symbol; |
5d3236ee DK |
810 | } |
811 | if (blhe->type != bfd_link_hash_defined | |
f84854b6 L |
812 | && blhe->type != bfd_link_hash_defweak |
813 | && blhe->type != bfd_link_hash_common) | |
5d3236ee DK |
814 | { |
815 | /* We should not have a new, indirect or warning symbol here. */ | |
df5f2391 | 816 | einfo (_("%F%P: %s: plugin symbol table corrupt (sym type %d)\n"), |
f84854b6 | 817 | called_plugin->name, blhe->type); |
5d3236ee DK |
818 | } |
819 | ||
42a851a9 DK |
820 | /* Find out which section owns the symbol. Since it's not undef, |
821 | it must have an owner; if it's not a common symbol, both defs | |
822 | and weakdefs keep it in the same place. */ | |
9e2278f5 AM |
823 | owner_sec = (blhe->type == bfd_link_hash_common |
824 | ? blhe->u.c.p->section | |
825 | : blhe->u.def.section); | |
42a851a9 | 826 | |
5d3236ee DK |
827 | |
828 | /* If it was originally undefined or common, then it has been | |
f84854b6 L |
829 | resolved; determine how. */ |
830 | if (syms[n].def == LDPK_UNDEF | |
831 | || syms[n].def == LDPK_WEAKUNDEF | |
5d3236ee DK |
832 | || syms[n].def == LDPK_COMMON) |
833 | { | |
5d3236ee | 834 | if (owner_sec->owner == link_info.output_bfd) |
69ee6ab2 | 835 | res = LDPR_RESOLVED_EXEC; |
5d3236ee | 836 | else if (owner_sec->owner == abfd) |
69ee6ab2 | 837 | res = LDPR_PREVAILING_DEF_IRONLY; |
5d3236ee | 838 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
69ee6ab2 | 839 | res = LDPR_RESOLVED_IR; |
cc322803 L |
840 | else if (owner_sec->owner != NULL |
841 | && (owner_sec->owner->flags & DYNAMIC) != 0) | |
69ee6ab2 | 842 | res = LDPR_RESOLVED_DYN; |
5d3236ee | 843 | else |
69ee6ab2 | 844 | res = LDPR_RESOLVED_EXEC; |
5d3236ee DK |
845 | } |
846 | ||
847 | /* Was originally def, or weakdef. Does it prevail? If the | |
f84854b6 | 848 | owner is the original dummy bfd that supplied it, then this |
5d3236ee | 849 | is the definition that has prevailed. */ |
69ee6ab2 AM |
850 | else if (owner_sec->owner == link_info.output_bfd) |
851 | res = LDPR_PREEMPTED_REG; | |
42a851a9 | 852 | else if (owner_sec->owner == abfd) |
69ee6ab2 | 853 | res = LDPR_PREVAILING_DEF_IRONLY; |
5d3236ee DK |
854 | |
855 | /* Was originally def, weakdef, or common, but has been pre-empted. */ | |
69ee6ab2 AM |
856 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
857 | res = LDPR_PREEMPTED_IR; | |
858 | else | |
859 | res = LDPR_PREEMPTED_REG; | |
860 | ||
861 | if (res == LDPR_PREVAILING_DEF_IRONLY) | |
862 | { | |
863 | /* We need to know if the sym is referenced from non-IR files. Or | |
864 | even potentially-referenced, perhaps in a future final link if | |
865 | this is a partial one, perhaps dynamically at load-time if the | |
da422fa4 L |
866 | symbol is externally visible. Also check for __real_SYM |
867 | reference and wrapper symbol. */ | |
868 | if (blhe->non_ir_ref_regular | |
869 | || blhe->ref_real | |
870 | || wrap_status == wrapper) | |
69ee6ab2 | 871 | res = LDPR_PREVAILING_DEF; |
6fe014bc L |
872 | else if (wrap_status == wrapped) |
873 | res = LDPR_RESOLVED_IR; | |
9bbc1a67 | 874 | else if (is_visible_from_outside (&syms[n], blhe)) |
69ee6ab2 AM |
875 | res = def_ironly_exp; |
876 | } | |
1715a13c | 877 | |
9e2278f5 | 878 | report_symbol: |
69ee6ab2 | 879 | syms[n].resolution = res; |
1715a13c | 880 | if (report_plugin_symbols) |
871b3ab2 | 881 | einfo (_("%P: %pB: symbol `%s' " |
7ea79cb3 | 882 | "definition: %s, visibility: %s, resolution: %s\n"), |
9e2278f5 | 883 | abfd, syms[n].name, |
7ea79cb3 | 884 | get_lto_kind (syms[n].def), |
885 | get_lto_visibility (syms[n].visibility), | |
886 | get_lto_resolution (res)); | |
5d3236ee DK |
887 | } |
888 | return LDPS_OK; | |
889 | } | |
890 | ||
69ee6ab2 AM |
891 | static enum ld_plugin_status |
892 | get_symbols_v1 (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
893 | { | |
894 | return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF); | |
895 | } | |
896 | ||
897 | static enum ld_plugin_status | |
898 | get_symbols_v2 (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
899 | { | |
900 | return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF_IRONLY_EXP); | |
901 | } | |
902 | ||
5d3236ee DK |
903 | /* Add a new (real) input file generated by a plugin. */ |
904 | static enum ld_plugin_status | |
905 | add_input_file (const char *pathname) | |
906 | { | |
ce875075 AM |
907 | lang_input_statement_type *is; |
908 | ||
5d3236ee | 909 | ASSERT (called_plugin); |
ce875075 AM |
910 | is = lang_add_input_file (xstrdup (pathname), lang_input_file_is_file_enum, |
911 | NULL); | |
912 | if (!is) | |
5d3236ee | 913 | return LDPS_ERR; |
ce875075 | 914 | is->flags.lto_output = 1; |
5d3236ee DK |
915 | return LDPS_OK; |
916 | } | |
917 | ||
918 | /* Add a new (real) library required by a plugin. */ | |
919 | static enum ld_plugin_status | |
920 | add_input_library (const char *pathname) | |
921 | { | |
ce875075 AM |
922 | lang_input_statement_type *is; |
923 | ||
5d3236ee | 924 | ASSERT (called_plugin); |
ce875075 AM |
925 | is = lang_add_input_file (xstrdup (pathname), lang_input_file_is_l_enum, |
926 | NULL); | |
927 | if (!is) | |
5d3236ee | 928 | return LDPS_ERR; |
ce875075 | 929 | is->flags.lto_output = 1; |
5d3236ee DK |
930 | return LDPS_OK; |
931 | } | |
932 | ||
933 | /* Set the extra library path to be used by libraries added via | |
934 | add_input_library. */ | |
935 | static enum ld_plugin_status | |
936 | set_extra_library_path (const char *path) | |
937 | { | |
938 | ASSERT (called_plugin); | |
f38a2680 | 939 | ldfile_add_library_path (xstrdup (path), false); |
5d3236ee DK |
940 | return LDPS_OK; |
941 | } | |
942 | ||
943 | /* Issue a diagnostic message from a plugin. */ | |
944 | static enum ld_plugin_status | |
945 | message (int level, const char *format, ...) | |
946 | { | |
947 | va_list args; | |
948 | va_start (args, format); | |
949 | ||
950 | switch (level) | |
951 | { | |
952 | case LDPL_INFO: | |
f38a2680 | 953 | vfinfo (stdout, format, args, false); |
d251c5c4 | 954 | putchar ('\n'); |
5d3236ee DK |
955 | break; |
956 | case LDPL_WARNING: | |
45e81354 | 957 | { |
df5f2391 | 958 | char *newfmt = concat (_("%P: warning: "), format, "\n", |
e1fa0163 | 959 | (const char *) NULL); |
f38a2680 | 960 | vfinfo (stdout, newfmt, args, true); |
e1fa0163 | 961 | free (newfmt); |
45e81354 | 962 | } |
5d3236ee DK |
963 | break; |
964 | case LDPL_FATAL: | |
965 | case LDPL_ERROR: | |
966 | default: | |
9e2278f5 | 967 | { |
df5f2391 AM |
968 | char *newfmt = concat (level == LDPL_FATAL ? "%F" : "%X", |
969 | _("%P: error: "), format, "\n", | |
e1fa0163 | 970 | (const char *) NULL); |
9e2278f5 | 971 | fflush (stdout); |
f38a2680 | 972 | vfinfo (stderr, newfmt, args, true); |
9e2278f5 | 973 | fflush (stderr); |
e1fa0163 | 974 | free (newfmt); |
9e2278f5 | 975 | } |
5d3236ee DK |
976 | break; |
977 | } | |
978 | ||
979 | va_end (args); | |
980 | return LDPS_OK; | |
981 | } | |
982 | ||
983 | /* Helper to size leading part of tv array and set it up. */ | |
69ee6ab2 | 984 | static void |
5d3236ee DK |
985 | set_tv_header (struct ld_plugin_tv *tv) |
986 | { | |
987 | size_t i; | |
988 | ||
989 | /* Version info. */ | |
990 | static const unsigned int major = (unsigned)(BFD_VERSION / 100000000UL); | |
991 | static const unsigned int minor = (unsigned)(BFD_VERSION / 1000000UL) % 100; | |
992 | ||
5d3236ee DK |
993 | for (i = 0; i < tv_header_size; i++) |
994 | { | |
995 | tv[i].tv_tag = tv_header_tags[i]; | |
996 | #define TVU(x) tv[i].tv_u.tv_ ## x | |
997 | switch (tv[i].tv_tag) | |
998 | { | |
f84854b6 L |
999 | case LDPT_MESSAGE: |
1000 | TVU(message) = message; | |
1001 | break; | |
1002 | case LDPT_API_VERSION: | |
1003 | TVU(val) = LD_PLUGIN_API_VERSION; | |
1004 | break; | |
1005 | case LDPT_GNU_LD_VERSION: | |
1006 | TVU(val) = major * 100 + minor; | |
1007 | break; | |
1008 | case LDPT_LINKER_OUTPUT: | |
64d94ba0 AM |
1009 | TVU(val) = (bfd_link_relocatable (&link_info) ? LDPO_REL |
1010 | : bfd_link_pde (&link_info) ? LDPO_EXEC | |
1011 | : bfd_link_pie (&link_info) ? LDPO_PIE | |
1012 | : LDPO_DYN); | |
f84854b6 L |
1013 | break; |
1014 | case LDPT_OUTPUT_NAME: | |
1015 | TVU(string) = output_filename; | |
1016 | break; | |
1017 | case LDPT_REGISTER_CLAIM_FILE_HOOK: | |
1018 | TVU(register_claim_file) = register_claim_file; | |
1019 | break; | |
1020 | case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: | |
1021 | TVU(register_all_symbols_read) = register_all_symbols_read; | |
1022 | break; | |
1023 | case LDPT_REGISTER_CLEANUP_HOOK: | |
1024 | TVU(register_cleanup) = register_cleanup; | |
1025 | break; | |
1026 | case LDPT_ADD_SYMBOLS: | |
1027 | TVU(add_symbols) = add_symbols; | |
1028 | break; | |
1029 | case LDPT_GET_INPUT_FILE: | |
1030 | TVU(get_input_file) = get_input_file; | |
1031 | break; | |
15f7a26b L |
1032 | case LDPT_GET_VIEW: |
1033 | TVU(get_view) = get_view; | |
1034 | break; | |
f84854b6 L |
1035 | case LDPT_RELEASE_INPUT_FILE: |
1036 | TVU(release_input_file) = release_input_file; | |
1037 | break; | |
1038 | case LDPT_GET_SYMBOLS: | |
69ee6ab2 AM |
1039 | TVU(get_symbols) = get_symbols_v1; |
1040 | break; | |
1041 | case LDPT_GET_SYMBOLS_V2: | |
1042 | TVU(get_symbols) = get_symbols_v2; | |
f84854b6 L |
1043 | break; |
1044 | case LDPT_ADD_INPUT_FILE: | |
1045 | TVU(add_input_file) = add_input_file; | |
1046 | break; | |
1047 | case LDPT_ADD_INPUT_LIBRARY: | |
1048 | TVU(add_input_library) = add_input_library; | |
1049 | break; | |
1050 | case LDPT_SET_EXTRA_LIBRARY_PATH: | |
1051 | TVU(set_extra_library_path) = set_extra_library_path; | |
1052 | break; | |
1053 | default: | |
1054 | /* Added a new entry to the array without adding | |
1055 | a new case to set up its value is a bug. */ | |
1056 | FAIL (); | |
5d3236ee DK |
1057 | } |
1058 | #undef TVU | |
1059 | } | |
5d3236ee DK |
1060 | } |
1061 | ||
1062 | /* Append the per-plugin args list and trailing LDPT_NULL to tv. */ | |
1063 | static void | |
1064 | set_tv_plugin_args (plugin_t *plugin, struct ld_plugin_tv *tv) | |
1065 | { | |
1066 | plugin_arg_t *arg = plugin->args; | |
1067 | while (arg) | |
1068 | { | |
1069 | tv->tv_tag = LDPT_OPTION; | |
1070 | tv->tv_u.tv_string = arg->arg; | |
1071 | arg = arg->next; | |
1072 | tv++; | |
1073 | } | |
1074 | tv->tv_tag = LDPT_NULL; | |
1075 | tv->tv_u.tv_val = 0; | |
1076 | } | |
1077 | ||
1078 | /* Load up and initialise all plugins after argument parsing. */ | |
d82184d7 | 1079 | void |
d44ad554 | 1080 | plugin_load_plugins (void) |
5d3236ee DK |
1081 | { |
1082 | struct ld_plugin_tv *my_tv; | |
1083 | unsigned int max_args = 0; | |
1084 | plugin_t *curplug = plugins_list; | |
1085 | ||
1086 | /* If there are no plugins, we need do nothing this run. */ | |
1087 | if (!curplug) | |
d82184d7 | 1088 | return; |
5d3236ee DK |
1089 | |
1090 | /* First pass over plugins to find max # args needed so that we | |
1091 | can size and allocate the tv array. */ | |
1092 | while (curplug) | |
1093 | { | |
1094 | if (curplug->n_args > max_args) | |
1095 | max_args = curplug->n_args; | |
1096 | curplug = curplug->next; | |
1097 | } | |
1098 | ||
1099 | /* Allocate tv array and initialise constant part. */ | |
1100 | my_tv = xmalloc ((max_args + 1 + tv_header_size) * sizeof *my_tv); | |
1101 | set_tv_header (my_tv); | |
1102 | ||
1103 | /* Pass over plugins again, activating them. */ | |
1104 | curplug = plugins_list; | |
1105 | while (curplug) | |
1106 | { | |
1107 | enum ld_plugin_status rv; | |
a8f9d13e AM |
1108 | ld_plugin_onload onloadfn; |
1109 | ||
1110 | onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "onload"); | |
5d3236ee | 1111 | if (!onloadfn) |
a8f9d13e | 1112 | onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "_onload"); |
5d3236ee | 1113 | if (!onloadfn) |
df5f2391 | 1114 | einfo (_("%F%P: %s: error loading plugin: %s\n"), |
d82184d7 | 1115 | curplug->name, dlerror ()); |
5d3236ee DK |
1116 | set_tv_plugin_args (curplug, &my_tv[tv_header_size]); |
1117 | called_plugin = curplug; | |
1118 | rv = (*onloadfn) (my_tv); | |
1119 | called_plugin = NULL; | |
1120 | if (rv != LDPS_OK) | |
df5f2391 | 1121 | einfo (_("%F%P: %s: plugin error: %d\n"), curplug->name, rv); |
5d3236ee DK |
1122 | curplug = curplug->next; |
1123 | } | |
1124 | ||
1125 | /* Since plugin(s) inited ok, assume they're going to want symbol | |
1126 | resolutions, which needs us to track which symbols are referenced | |
1127 | by non-IR files using the linker's notice callback. */ | |
9e2278f5 AM |
1128 | orig_notice_all = link_info.notice_all; |
1129 | orig_callbacks = link_info.callbacks; | |
1130 | plugin_callbacks = *orig_callbacks; | |
1131 | plugin_callbacks.notice = &plugin_notice; | |
f38a2680 AM |
1132 | link_info.notice_all = true; |
1133 | link_info.lto_plugin_active = true; | |
9e2278f5 | 1134 | link_info.callbacks = &plugin_callbacks; |
38604796 | 1135 | |
5ae0078c L |
1136 | register_ld_plugin_object_p (plugin_object_p); |
1137 | ||
38604796 | 1138 | #if HAVE_MMAP && HAVE_GETPAGESIZE |
fd5a1509 | 1139 | plugin_pagesize = getpagesize (); |
38604796 | 1140 | #endif |
5d3236ee DK |
1141 | } |
1142 | ||
1143 | /* Call 'claim file' hook for all plugins. */ | |
02d00247 | 1144 | static int |
5d3236ee DK |
1145 | plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed) |
1146 | { | |
1147 | plugin_t *curplug = plugins_list; | |
f38a2680 | 1148 | *claimed = false; |
5d3236ee DK |
1149 | while (curplug && !*claimed) |
1150 | { | |
1151 | if (curplug->claim_file_handler) | |
1152 | { | |
1153 | enum ld_plugin_status rv; | |
ace667e5 | 1154 | |
5d3236ee DK |
1155 | called_plugin = curplug; |
1156 | rv = (*curplug->claim_file_handler) (file, claimed); | |
1157 | called_plugin = NULL; | |
1158 | if (rv != LDPS_OK) | |
1159 | set_plugin_error (curplug->name); | |
1160 | } | |
1161 | curplug = curplug->next; | |
1162 | } | |
1163 | return plugin_error_p () ? -1 : 0; | |
1164 | } | |
1165 | ||
35a1e5f3 L |
1166 | /* Duplicates a character string with memory attached to ABFD. */ |
1167 | ||
1168 | static char * | |
1169 | plugin_strdup (bfd *abfd, const char *str) | |
1170 | { | |
1171 | size_t strlength; | |
1172 | char *copy; | |
1173 | strlength = strlen (str) + 1; | |
1174 | copy = bfd_alloc (abfd, strlength); | |
1175 | if (copy == NULL) | |
df5f2391 | 1176 | einfo (_("%F%P: plugin_strdup failed to allocate memory: %s\n"), |
35a1e5f3 L |
1177 | bfd_get_error ()); |
1178 | memcpy (copy, str, strlength); | |
1179 | return copy; | |
1180 | } | |
1181 | ||
cb001c0d AM |
1182 | static void |
1183 | plugin_cleanup (bfd *abfd ATTRIBUTE_UNUSED) | |
1184 | { | |
1185 | } | |
1186 | ||
1187 | static bfd_cleanup | |
5ae0078c | 1188 | plugin_object_p (bfd *ibfd) |
02d00247 | 1189 | { |
5ae0078c | 1190 | int claimed; |
f4b78d18 | 1191 | plugin_input_file_t *input; |
35a1e5f3 L |
1192 | struct ld_plugin_input_file file; |
1193 | bfd *abfd; | |
5ae0078c L |
1194 | |
1195 | /* Don't try the dummy object file. */ | |
1196 | if ((ibfd->flags & BFD_PLUGIN) != 0) | |
1197 | return NULL; | |
1198 | ||
49f30d83 | 1199 | if (ibfd->plugin_format != bfd_plugin_unknown) |
5ae0078c L |
1200 | { |
1201 | if (ibfd->plugin_format == bfd_plugin_yes) | |
cb001c0d | 1202 | return plugin_cleanup; |
5ae0078c L |
1203 | else |
1204 | return NULL; | |
1205 | } | |
1206 | ||
02d00247 AM |
1207 | /* We create a dummy BFD, initially empty, to house whatever symbols |
1208 | the plugin may want to add. */ | |
607b4833 | 1209 | abfd = plugin_get_ir_dummy_bfd (bfd_get_filename (ibfd), ibfd); |
f4b78d18 L |
1210 | |
1211 | input = bfd_alloc (abfd, sizeof (*input)); | |
1212 | if (input == NULL) | |
df5f2391 | 1213 | einfo (_("%F%P: plugin failed to allocate memory for input: %s\n"), |
f4b78d18 L |
1214 | bfd_get_error ()); |
1215 | ||
7d0b9ebc AM |
1216 | if (!bfd_plugin_open_input (ibfd, &file)) |
1217 | return NULL; | |
35a1e5f3 | 1218 | |
607b4833 | 1219 | if (file.name == bfd_get_filename (ibfd)) |
7d0b9ebc | 1220 | { |
35a1e5f3 L |
1221 | /* We must copy filename attached to ibfd if it is not an archive |
1222 | member since it may be freed by bfd_close below. */ | |
7d0b9ebc | 1223 | file.name = plugin_strdup (abfd, file.name); |
35a1e5f3 L |
1224 | } |
1225 | ||
35a1e5f3 | 1226 | file.handle = input; |
f4b78d18 | 1227 | input->abfd = abfd; |
7a30ac44 | 1228 | input->ibfd = ibfd->my_archive != NULL ? ibfd : NULL; |
2aec968d L |
1229 | input->view_buffer.addr = NULL; |
1230 | input->view_buffer.filesize = 0; | |
1231 | input->view_buffer.offset = 0; | |
7d0b9ebc | 1232 | input->fd = file.fd; |
f38a2680 | 1233 | input->use_mmap = false; |
7d0b9ebc AM |
1234 | input->offset = file.offset; |
1235 | input->filesize = file.filesize; | |
607b4833 | 1236 | input->name = plugin_strdup (abfd, bfd_get_filename (ibfd)); |
f4b78d18 | 1237 | |
5ae0078c L |
1238 | claimed = 0; |
1239 | ||
35a1e5f3 | 1240 | if (plugin_call_claim_file (&file, &claimed)) |
df5f2391 | 1241 | einfo (_("%F%P: %s: plugin reported error claiming file\n"), |
02d00247 | 1242 | plugin_error_plugin ()); |
f4b78d18 | 1243 | |
91817247 L |
1244 | if (input->fd != -1 |
1245 | && (!claimed || !bfd_plugin_target_p (ibfd->xvec))) | |
f4b78d18 | 1246 | { |
5ae0078c L |
1247 | /* FIXME: fd belongs to us, not the plugin. GCC plugin, which |
1248 | doesn't need fd after plugin_call_claim_file, doesn't use | |
1249 | BFD plugin target vector. Since GCC plugin doesn't call | |
1250 | release_input_file, we close it here. LLVM plugin, which | |
1251 | needs fd after plugin_call_claim_file and calls | |
1252 | release_input_file after it is done, uses BFD plugin target | |
1253 | vector. This scheme doesn't work when a plugin needs fd and | |
1254 | doesn't use BFD plugin target vector neither. */ | |
91817247 | 1255 | release_plugin_file_descriptor (input); |
f4b78d18 L |
1256 | } |
1257 | ||
02d00247 AM |
1258 | if (claimed) |
1259 | { | |
5ae0078c L |
1260 | ibfd->plugin_format = bfd_plugin_yes; |
1261 | ibfd->plugin_dummy_bfd = abfd; | |
35a1e5f3 | 1262 | bfd_make_readable (abfd); |
2aa90762 | 1263 | abfd->no_export = ibfd->no_export; |
cb001c0d | 1264 | return plugin_cleanup; |
02d00247 AM |
1265 | } |
1266 | else | |
1267 | { | |
38604796 L |
1268 | #if HAVE_MMAP |
1269 | if (input->use_mmap) | |
1270 | { | |
1271 | /* If plugin didn't claim the file, unmap the buffer. */ | |
1272 | char *addr = input->view_buffer.addr; | |
1273 | off_t size = input->view_buffer.filesize; | |
1274 | # if HAVE_GETPAGESIZE | |
1275 | off_t bias = input->view_buffer.offset % plugin_pagesize; | |
1276 | size += bias; | |
1277 | addr -= bias; | |
1278 | # endif | |
1279 | munmap (addr, size); | |
1280 | } | |
1281 | #endif | |
1282 | ||
02d00247 AM |
1283 | /* If plugin didn't claim the file, we don't need the dummy bfd. |
1284 | Can't avoid speculatively creating it, alas. */ | |
5ae0078c | 1285 | ibfd->plugin_format = bfd_plugin_no; |
f4b78d18 | 1286 | bfd_close_all_done (abfd); |
5ae0078c L |
1287 | return NULL; |
1288 | } | |
1289 | } | |
1290 | ||
1291 | void | |
1292 | plugin_maybe_claim (lang_input_statement_type *entry) | |
1293 | { | |
fb47deda | 1294 | ASSERT (entry->header.type == lang_input_statement_enum); |
5ae0078c L |
1295 | if (plugin_object_p (entry->the_bfd)) |
1296 | { | |
1297 | bfd *abfd = entry->the_bfd->plugin_dummy_bfd; | |
1298 | ||
1299 | /* Discard the real file's BFD and substitute the dummy one. */ | |
1300 | ||
b0cffb47 AM |
1301 | /* We can't call bfd_close on archives. BFD archive handling |
1302 | caches elements, and add_archive_element keeps pointers to | |
1303 | the_bfd and the_bfd->filename in a lang_input_statement_type | |
1304 | linker script statement. */ | |
5ae0078c L |
1305 | if (entry->the_bfd->my_archive == NULL) |
1306 | bfd_close (entry->the_bfd); | |
1307 | entry->the_bfd = abfd; | |
1308 | entry->flags.claimed = 1; | |
02d00247 AM |
1309 | } |
1310 | } | |
1311 | ||
5d3236ee DK |
1312 | /* Call 'all symbols read' hook for all plugins. */ |
1313 | int | |
1314 | plugin_call_all_symbols_read (void) | |
1315 | { | |
1316 | plugin_t *curplug = plugins_list; | |
1317 | ||
1318 | /* Disable any further file-claiming. */ | |
f38a2680 | 1319 | no_more_claiming = true; |
5d3236ee | 1320 | |
5d3236ee DK |
1321 | while (curplug) |
1322 | { | |
1323 | if (curplug->all_symbols_read_handler) | |
1324 | { | |
1325 | enum ld_plugin_status rv; | |
1326 | called_plugin = curplug; | |
1327 | rv = (*curplug->all_symbols_read_handler) (); | |
1328 | called_plugin = NULL; | |
1329 | if (rv != LDPS_OK) | |
1330 | set_plugin_error (curplug->name); | |
1331 | } | |
1332 | curplug = curplug->next; | |
1333 | } | |
1334 | return plugin_error_p () ? -1 : 0; | |
1335 | } | |
1336 | ||
e73d965c | 1337 | /* Call 'cleanup' hook for all plugins at exit. */ |
498cd2a0 | 1338 | void |
5d3236ee DK |
1339 | plugin_call_cleanup (void) |
1340 | { | |
1341 | plugin_t *curplug = plugins_list; | |
1342 | while (curplug) | |
1343 | { | |
1344 | if (curplug->cleanup_handler && !curplug->cleanup_done) | |
1345 | { | |
1346 | enum ld_plugin_status rv; | |
f38a2680 | 1347 | curplug->cleanup_done = true; |
5d3236ee DK |
1348 | called_plugin = curplug; |
1349 | rv = (*curplug->cleanup_handler) (); | |
1350 | called_plugin = NULL; | |
1351 | if (rv != LDPS_OK) | |
d82184d7 L |
1352 | info_msg (_("%P: %s: error in plugin cleanup: %d (ignored)\n"), |
1353 | curplug->name, rv); | |
5d3236ee DK |
1354 | dlclose (curplug->dlhandle); |
1355 | } | |
1356 | curplug = curplug->next; | |
1357 | } | |
5d3236ee DK |
1358 | } |
1359 | ||
5d3236ee DK |
1360 | /* To determine which symbols should be resolved LDPR_PREVAILING_DEF |
1361 | and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as | |
35ed3f94 | 1362 | the linker adds them to the linker hash table. Mark those |
bc4e12de | 1363 | referenced from a non-IR file with non_ir_ref_regular or |
4070765b AM |
1364 | non_ir_ref_dynamic as appropriate. We have to notice_all symbols, |
1365 | because we won't necessarily know until later which ones will be | |
1366 | contributed by IR files. */ | |
f38a2680 | 1367 | static bool |
9e2278f5 | 1368 | plugin_notice (struct bfd_link_info *info, |
35ed3f94 | 1369 | struct bfd_link_hash_entry *h, |
46135103 | 1370 | struct bfd_link_hash_entry *inh, |
9e2278f5 AM |
1371 | bfd *abfd, |
1372 | asection *section, | |
16d96b5b | 1373 | bfd_vma value, |
46135103 | 1374 | flagword flags) |
5d3236ee | 1375 | { |
46135103 AM |
1376 | struct bfd_link_hash_entry *orig_h = h; |
1377 | ||
35ed3f94 | 1378 | if (h != NULL) |
5d3236ee | 1379 | { |
cd6eee13 | 1380 | bfd *sym_bfd; |
f38a2680 | 1381 | bool ref = false; |
cd6eee13 | 1382 | |
46135103 AM |
1383 | if (h->type == bfd_link_hash_warning) |
1384 | h = h->u.i.link; | |
1385 | ||
4a2b04a7 | 1386 | /* Nothing to do here if this def/ref is from an IR dummy BFD. */ |
9e2278f5 | 1387 | if (is_ir_dummy_bfd (abfd)) |
4a2b04a7 | 1388 | ; |
9e2278f5 | 1389 | |
16d96b5b AM |
1390 | /* Making an indirect symbol counts as a reference unless this |
1391 | is a brand new symbol. */ | |
4a2b04a7 L |
1392 | else if (bfd_is_ind_section (section) |
1393 | || (flags & BSF_INDIRECT) != 0) | |
16d96b5b | 1394 | { |
46135103 AM |
1395 | /* ??? Some of this is questionable. See comments in |
1396 | _bfd_generic_link_add_one_symbol for case IND. */ | |
4070765b AM |
1397 | if (h->type != bfd_link_hash_new |
1398 | || inh->type == bfd_link_hash_new) | |
16d96b5b | 1399 | { |
4070765b | 1400 | if ((abfd->flags & DYNAMIC) == 0) |
f38a2680 | 1401 | inh->non_ir_ref_regular = true; |
4070765b | 1402 | else |
f38a2680 | 1403 | inh->non_ir_ref_dynamic = true; |
16d96b5b | 1404 | } |
4070765b AM |
1405 | |
1406 | if (h->type != bfd_link_hash_new) | |
f38a2680 | 1407 | ref = true; |
16d96b5b AM |
1408 | } |
1409 | ||
1410 | /* Nothing to do here for warning symbols. */ | |
1411 | else if ((flags & BSF_WARNING) != 0) | |
1412 | ; | |
1413 | ||
1414 | /* Nothing to do here for constructor symbols. */ | |
1415 | else if ((flags & BSF_CONSTRUCTOR) != 0) | |
1416 | ; | |
1417 | ||
35ed3f94 | 1418 | /* If this is a ref, set non_ir_ref. */ |
16d96b5b | 1419 | else if (bfd_is_und_section (section)) |
3d5bef4c L |
1420 | { |
1421 | /* Replace the undefined dummy bfd with the real one. */ | |
4070765b AM |
1422 | if ((h->type == bfd_link_hash_undefined |
1423 | || h->type == bfd_link_hash_undefweak) | |
1424 | && (h->u.undef.abfd == NULL | |
1425 | || (h->u.undef.abfd->flags & BFD_PLUGIN) != 0)) | |
59fa66c5 | 1426 | h->u.undef.abfd = abfd; |
f38a2680 | 1427 | ref = true; |
3d5bef4c | 1428 | } |
35ed3f94 | 1429 | |
af4fa23f AM |
1430 | |
1431 | /* A common symbol should be merged with other commons or | |
1432 | defs with the same name. In particular, a common ought | |
1433 | to be overridden by a def in a -flto object. In that | |
1434 | sense a common is also a ref. */ | |
1435 | else if (bfd_is_com_section (section)) | |
cd6eee13 | 1436 | { |
af4fa23f AM |
1437 | if (h->type == bfd_link_hash_common |
1438 | && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner)) | |
0616a280 AM |
1439 | { |
1440 | h->type = bfd_link_hash_undefweak; | |
1441 | h->u.undef.abfd = sym_bfd; | |
1442 | } | |
f38a2680 | 1443 | ref = true; |
af4fa23f | 1444 | } |
4070765b | 1445 | |
af4fa23f AM |
1446 | /* Otherwise, it must be a new def. |
1447 | Ensure any symbol defined in an IR dummy BFD takes on a | |
1448 | new value from a real BFD. Weak symbols are not normally | |
1449 | overridden by a new weak definition, and strong symbols | |
1450 | will normally cause multiple definition errors. Avoid | |
0e6a3f07 L |
1451 | this by making the symbol appear to be undefined. |
1452 | ||
1453 | NB: We change the previous definition in the IR object to | |
04e433a8 L |
1454 | undefweak only after all LTO symbols have been read or for |
1455 | non-ELF targets. */ | |
1456 | else if ((info->lto_all_symbols_read | |
1457 | || bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
0e6a3f07 L |
1458 | && (((h->type == bfd_link_hash_defweak |
1459 | || h->type == bfd_link_hash_defined) | |
1460 | && is_ir_dummy_bfd (sym_bfd = h->u.def.section->owner)) | |
1461 | || (h->type == bfd_link_hash_common | |
1462 | && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner)))) | |
af4fa23f AM |
1463 | { |
1464 | h->type = bfd_link_hash_undefweak; | |
1465 | h->u.undef.abfd = sym_bfd; | |
4070765b AM |
1466 | } |
1467 | ||
1468 | if (ref) | |
1469 | { | |
1470 | if ((abfd->flags & DYNAMIC) == 0) | |
f38a2680 | 1471 | h->non_ir_ref_regular = true; |
4070765b | 1472 | else |
f38a2680 | 1473 | h->non_ir_ref_dynamic = true; |
cd6eee13 | 1474 | } |
5d3236ee DK |
1475 | } |
1476 | ||
1477 | /* Continue with cref/nocrossref/trace-sym processing. */ | |
46135103 | 1478 | if (orig_h == NULL |
9e2278f5 AM |
1479 | || orig_notice_all |
1480 | || (info->notice_hash != NULL | |
46135103 | 1481 | && bfd_hash_lookup (info->notice_hash, orig_h->root.string, |
f38a2680 | 1482 | false, false) != NULL)) |
46135103 AM |
1483 | return (*orig_callbacks->notice) (info, orig_h, inh, |
1484 | abfd, section, value, flags); | |
f38a2680 | 1485 | return true; |
5d3236ee | 1486 | } |
0381901e | 1487 | #endif /* BFD_SUPPORTS_PLUGINS */ |