Commit | Line | Data |
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5d3236ee | 1 | /* Plugin control for the GNU linker. |
82704155 | 2 | Copyright (C) 2010-2019 Free Software Foundation, Inc. |
5d3236ee DK |
3 | |
4 | This file is part of the GNU Binutils. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
21 | #include "sysdep.h" | |
22 | #include "libiberty.h" | |
23 | #include "bfd.h" | |
24 | #include "bfdlink.h" | |
25 | #include "bfdver.h" | |
26 | #include "ld.h" | |
27 | #include "ldmain.h" | |
28 | #include "ldmisc.h" | |
29 | #include "ldexp.h" | |
30 | #include "ldlang.h" | |
31 | #include "ldfile.h" | |
7d0b9ebc | 32 | #include "plugin-api.h" |
5ae0078c | 33 | #include "../bfd/plugin.h" |
5d3236ee | 34 | #include "plugin.h" |
5d3236ee | 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 | |
5ae0078c L |
177 | static const bfd_target * plugin_object_p (bfd *); |
178 | ||
3917d5d5 DK |
179 | #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) |
180 | ||
181 | #define RTLD_NOW 0 /* Dummy value. */ | |
182 | ||
183 | static void * | |
184 | dlopen (const char *file, int mode ATTRIBUTE_UNUSED) | |
185 | { | |
186 | return LoadLibrary (file); | |
187 | } | |
188 | ||
189 | static void * | |
190 | dlsym (void *handle, const char *name) | |
191 | { | |
192 | return GetProcAddress (handle, name); | |
193 | } | |
194 | ||
195 | static int | |
196 | dlclose (void *handle) | |
197 | { | |
198 | FreeLibrary (handle); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */ | |
203 | ||
d82184d7 L |
204 | #ifndef HAVE_DLFCN_H |
205 | static const char * | |
206 | dlerror (void) | |
207 | { | |
208 | return ""; | |
209 | } | |
210 | #endif | |
211 | ||
5d3236ee DK |
212 | /* Helper function for exiting with error status. */ |
213 | static int | |
214 | set_plugin_error (const char *plugin) | |
215 | { | |
216 | error_plugin = plugin; | |
217 | return -1; | |
218 | } | |
219 | ||
220 | /* Test if an error occurred. */ | |
221 | static bfd_boolean | |
222 | plugin_error_p (void) | |
223 | { | |
224 | return error_plugin != NULL; | |
225 | } | |
226 | ||
227 | /* Return name of plugin which caused an error if any. */ | |
d44ad554 DK |
228 | const char * |
229 | plugin_error_plugin (void) | |
5d3236ee DK |
230 | { |
231 | return error_plugin ? error_plugin : _("<no plugin>"); | |
232 | } | |
233 | ||
234 | /* Handle -plugin arg: find and load plugin, or return error. */ | |
d82184d7 | 235 | void |
d44ad554 | 236 | plugin_opt_plugin (const char *plugin) |
5d3236ee DK |
237 | { |
238 | plugin_t *newplug; | |
c3e1c28e | 239 | plugin_t *curplug = plugins_list; |
5d3236ee DK |
240 | |
241 | newplug = xmalloc (sizeof *newplug); | |
242 | memset (newplug, 0, sizeof *newplug); | |
243 | newplug->name = plugin; | |
244 | newplug->dlhandle = dlopen (plugin, RTLD_NOW); | |
245 | if (!newplug->dlhandle) | |
df5f2391 | 246 | einfo (_("%F%P: %s: error loading plugin: %s\n"), plugin, dlerror ()); |
5d3236ee | 247 | |
c3e1c28e L |
248 | /* Check if plugin has been loaded already. */ |
249 | while (curplug) | |
250 | { | |
251 | if (newplug->dlhandle == curplug->dlhandle) | |
252 | { | |
253 | einfo (_("%P: %s: duplicated plugin\n"), plugin); | |
254 | free (newplug); | |
255 | return; | |
256 | } | |
257 | curplug = curplug->next; | |
258 | } | |
259 | ||
5d3236ee DK |
260 | /* Chain on end, so when we run list it is in command-line order. */ |
261 | *plugins_tail_chain_ptr = newplug; | |
262 | plugins_tail_chain_ptr = &newplug->next; | |
263 | ||
264 | /* Record it as current plugin for receiving args. */ | |
265 | last_plugin = newplug; | |
266 | last_plugin_args_tail_chain_ptr = &newplug->args; | |
5d3236ee DK |
267 | } |
268 | ||
269 | /* Accumulate option arguments for last-loaded plugin, or return | |
270 | error if none. */ | |
d44ad554 DK |
271 | int |
272 | plugin_opt_plugin_arg (const char *arg) | |
5d3236ee DK |
273 | { |
274 | plugin_arg_t *newarg; | |
275 | ||
276 | if (!last_plugin) | |
277 | return set_plugin_error (_("<no plugin>")); | |
278 | ||
97964ab3 AM |
279 | /* Ignore -pass-through= from GCC driver. */ |
280 | if (*arg == '-') | |
281 | { | |
282 | const char *p = arg + 1; | |
283 | ||
284 | if (*p == '-') | |
285 | ++p; | |
286 | if (strncmp (p, "pass-through=", 13) == 0) | |
287 | return 0; | |
288 | } | |
289 | ||
5d3236ee DK |
290 | newarg = xmalloc (sizeof *newarg); |
291 | newarg->arg = arg; | |
292 | newarg->next = NULL; | |
293 | ||
294 | /* Chain on end to preserve command-line order. */ | |
295 | *last_plugin_args_tail_chain_ptr = newarg; | |
296 | last_plugin_args_tail_chain_ptr = &newarg->next; | |
297 | last_plugin->n_args++; | |
298 | return 0; | |
299 | } | |
300 | ||
37a3056a L |
301 | /* Generate a dummy BFD to represent an IR file, for any callers of |
302 | plugin_call_claim_file to use as the handle in the ld_plugin_input_file | |
303 | struct that they build to pass in. The BFD is initially writable, so | |
304 | that symbols can be added to it; it must be made readable after the | |
305 | add_symbols hook has been called so that it can be read when linking. */ | |
306 | static bfd * | |
5d3236ee DK |
307 | plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate) |
308 | { | |
bc110b6e | 309 | bfd *abfd; |
4a07dc81 | 310 | bfd_boolean bfd_plugin_target; |
bc110b6e AM |
311 | |
312 | bfd_use_reserved_id = 1; | |
4a07dc81 | 313 | bfd_plugin_target = bfd_plugin_target_p (srctemplate->xvec); |
9e2278f5 | 314 | abfd = bfd_create (concat (name, IRONLY_SUFFIX, (const char *) NULL), |
4a07dc81 | 315 | bfd_plugin_target ? link_info.output_bfd : srctemplate); |
9e2278f5 AM |
316 | if (abfd != NULL) |
317 | { | |
318 | abfd->flags |= BFD_LINKER_CREATED | BFD_PLUGIN; | |
5ae0078c L |
319 | if (!bfd_make_writable (abfd)) |
320 | goto report_error; | |
4a07dc81 | 321 | if (!bfd_plugin_target) |
5ae0078c L |
322 | { |
323 | bfd_set_arch_info (abfd, bfd_get_arch_info (srctemplate)); | |
324 | bfd_set_gp_size (abfd, bfd_get_gp_size (srctemplate)); | |
325 | if (!bfd_copy_private_bfd_data (srctemplate, abfd)) | |
326 | goto report_error; | |
327 | } | |
9e2278f5 AM |
328 | { |
329 | flagword flags; | |
330 | ||
c77ec726 | 331 | /* Create section to own the symbols. */ |
9e2278f5 AM |
332 | flags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY |
333 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE); | |
334 | if (bfd_make_section_anyway_with_flags (abfd, ".text", flags)) | |
335 | return abfd; | |
336 | } | |
337 | } | |
5ae0078c | 338 | report_error: |
df5f2391 | 339 | einfo (_("%F%P: could not create dummy IR bfd: %E\n")); |
9e2278f5 | 340 | return NULL; |
5d3236ee DK |
341 | } |
342 | ||
d44ad554 | 343 | /* Check if the BFD passed in is an IR dummy object file. */ |
23ebe1a0 | 344 | static inline bfd_boolean |
5d3236ee DK |
345 | is_ir_dummy_bfd (const bfd *abfd) |
346 | { | |
cf4dc96f | 347 | /* ABFD can sometimes legitimately be NULL, e.g. when called from one |
23ebe1a0 AM |
348 | of the linker callbacks for a symbol in the *ABS* or *UND* sections. */ |
349 | return abfd != NULL && (abfd->flags & BFD_PLUGIN) != 0; | |
5d3236ee DK |
350 | } |
351 | ||
352 | /* Helpers to convert between BFD and GOLD symbol formats. */ | |
353 | static enum ld_plugin_status | |
354 | asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, | |
f84854b6 | 355 | const struct ld_plugin_symbol *ldsym) |
5d3236ee DK |
356 | { |
357 | flagword flags = BSF_NO_FLAGS; | |
358 | struct bfd_section *section; | |
359 | ||
360 | asym->the_bfd = abfd; | |
f84854b6 | 361 | asym->name = (ldsym->version |
9e2278f5 | 362 | ? concat (ldsym->name, "@", ldsym->version, (const char *) NULL) |
f84854b6 | 363 | : ldsym->name); |
5d3236ee DK |
364 | asym->value = 0; |
365 | switch (ldsym->def) | |
366 | { | |
367 | case LDPK_WEAKDEF: | |
368 | flags = BSF_WEAK; | |
369 | /* FALLTHRU */ | |
370 | case LDPK_DEF: | |
371 | flags |= BSF_GLOBAL; | |
c77ec726 AM |
372 | if (ldsym->comdat_key) |
373 | { | |
374 | char *name = concat (".gnu.linkonce.t.", ldsym->comdat_key, | |
375 | (const char *) NULL); | |
376 | section = bfd_get_section_by_name (abfd, name); | |
377 | if (section != NULL) | |
378 | free (name); | |
379 | else | |
380 | { | |
381 | flagword sflags; | |
382 | ||
383 | sflags = (SEC_CODE | SEC_HAS_CONTENTS | SEC_READONLY | |
384 | | SEC_ALLOC | SEC_LOAD | SEC_KEEP | SEC_EXCLUDE | |
385 | | SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD); | |
386 | section = bfd_make_section_anyway_with_flags (abfd, name, sflags); | |
387 | if (section == NULL) | |
388 | return LDPS_ERR; | |
389 | } | |
390 | } | |
391 | else | |
392 | section = bfd_get_section_by_name (abfd, ".text"); | |
5d3236ee DK |
393 | break; |
394 | ||
395 | case LDPK_WEAKUNDEF: | |
396 | flags = BSF_WEAK; | |
397 | /* FALLTHRU */ | |
398 | case LDPK_UNDEF: | |
399 | section = bfd_und_section_ptr; | |
400 | break; | |
401 | ||
402 | case LDPK_COMMON: | |
403 | flags = BSF_GLOBAL; | |
404 | section = bfd_com_section_ptr; | |
405 | asym->value = ldsym->size; | |
5c08b7d4 L |
406 | /* For ELF targets, set alignment of common symbol to 1. */ |
407 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
02d00247 AM |
408 | { |
409 | ((elf_symbol_type *) asym)->internal_elf_sym.st_shndx = SHN_COMMON; | |
410 | ((elf_symbol_type *) asym)->internal_elf_sym.st_value = 1; | |
411 | } | |
5d3236ee DK |
412 | break; |
413 | ||
414 | default: | |
415 | return LDPS_ERR; | |
416 | } | |
417 | asym->flags = flags; | |
418 | asym->section = section; | |
419 | ||
420 | /* Visibility only applies on ELF targets. */ | |
421 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) | |
422 | { | |
423 | elf_symbol_type *elfsym = elf_symbol_from (abfd, asym); | |
cfac8028 L |
424 | unsigned char visibility; |
425 | ||
5d3236ee | 426 | if (!elfsym) |
df5f2391 | 427 | einfo (_("%F%P: %s: non-ELF symbol in ELF BFD!\n"), asym->name); |
cfac8028 L |
428 | switch (ldsym->visibility) |
429 | { | |
430 | default: | |
df5f2391 | 431 | einfo (_("%F%P: unknown ELF symbol visibility: %d!\n"), |
cfac8028 | 432 | ldsym->visibility); |
2b804145 AM |
433 | return LDPS_ERR; |
434 | ||
cfac8028 L |
435 | case LDPV_DEFAULT: |
436 | visibility = STV_DEFAULT; | |
437 | break; | |
438 | case LDPV_PROTECTED: | |
439 | visibility = STV_PROTECTED; | |
440 | break; | |
441 | case LDPV_INTERNAL: | |
442 | visibility = STV_INTERNAL; | |
443 | break; | |
444 | case LDPV_HIDDEN: | |
445 | visibility = STV_HIDDEN; | |
446 | break; | |
447 | } | |
448 | elfsym->internal_elf_sym.st_other | |
449 | = (visibility | (elfsym->internal_elf_sym.st_other | |
450 | & ~ELF_ST_VISIBILITY (-1))); | |
5d3236ee DK |
451 | } |
452 | ||
453 | return LDPS_OK; | |
454 | } | |
455 | ||
456 | /* Register a claim-file handler. */ | |
457 | static enum ld_plugin_status | |
458 | register_claim_file (ld_plugin_claim_file_handler handler) | |
459 | { | |
460 | ASSERT (called_plugin); | |
461 | called_plugin->claim_file_handler = handler; | |
462 | return LDPS_OK; | |
463 | } | |
464 | ||
465 | /* Register an all-symbols-read handler. */ | |
466 | static enum ld_plugin_status | |
467 | register_all_symbols_read (ld_plugin_all_symbols_read_handler handler) | |
468 | { | |
469 | ASSERT (called_plugin); | |
470 | called_plugin->all_symbols_read_handler = handler; | |
471 | return LDPS_OK; | |
472 | } | |
473 | ||
474 | /* Register a cleanup handler. */ | |
475 | static enum ld_plugin_status | |
476 | register_cleanup (ld_plugin_cleanup_handler handler) | |
477 | { | |
478 | ASSERT (called_plugin); | |
479 | called_plugin->cleanup_handler = handler; | |
480 | return LDPS_OK; | |
481 | } | |
482 | ||
483 | /* Add symbols from a plugin-claimed input file. */ | |
484 | static enum ld_plugin_status | |
485 | add_symbols (void *handle, int nsyms, const struct ld_plugin_symbol *syms) | |
486 | { | |
487 | asymbol **symptrs; | |
f4b78d18 L |
488 | plugin_input_file_t *input = handle; |
489 | bfd *abfd = input->abfd; | |
7fe550fc | 490 | int n; |
43e1669b | 491 | |
5d3236ee DK |
492 | ASSERT (called_plugin); |
493 | symptrs = xmalloc (nsyms * sizeof *symptrs); | |
7fe550fc | 494 | for (n = 0; n < nsyms; n++) |
5d3236ee DK |
495 | { |
496 | enum ld_plugin_status rv; | |
0c511000 AM |
497 | asymbol *bfdsym; |
498 | ||
0c511000 | 499 | bfdsym = bfd_make_empty_symbol (abfd); |
7fe550fc | 500 | symptrs[n] = bfdsym; |
5d3236ee DK |
501 | rv = asymbol_from_plugin_symbol (abfd, bfdsym, syms + n); |
502 | if (rv != LDPS_OK) | |
503 | return rv; | |
504 | } | |
7fe550fc | 505 | bfd_set_symtab (abfd, symptrs, nsyms); |
5d3236ee DK |
506 | return LDPS_OK; |
507 | } | |
508 | ||
509 | /* Get the input file information with an open (possibly re-opened) | |
510 | file descriptor. */ | |
511 | static enum ld_plugin_status | |
f4b78d18 | 512 | get_input_file (const void *handle, struct ld_plugin_input_file *file) |
5d3236ee | 513 | { |
f4b78d18 L |
514 | const plugin_input_file_t *input = handle; |
515 | ||
5d3236ee | 516 | ASSERT (called_plugin); |
f4b78d18 L |
517 | |
518 | file->name = input->name; | |
519 | file->offset = input->offset; | |
520 | file->filesize = input->filesize; | |
521 | file->handle = (void *) handle; | |
522 | ||
523 | return LDPS_OK; | |
5d3236ee DK |
524 | } |
525 | ||
15f7a26b L |
526 | /* Get view of the input file. */ |
527 | static enum ld_plugin_status | |
f4b78d18 | 528 | get_view (const void *handle, const void **viewp) |
15f7a26b | 529 | { |
2aec968d | 530 | plugin_input_file_t *input = (plugin_input_file_t *) handle; |
f4b78d18 | 531 | char *buffer; |
2aec968d | 532 | size_t size = input->filesize; |
38604796 L |
533 | off_t offset = input->offset; |
534 | #if HAVE_MMAP && HAVE_GETPAGESIZE | |
535 | off_t bias; | |
fe905789 | 536 | #endif |
f4b78d18 | 537 | |
15f7a26b | 538 | ASSERT (called_plugin); |
f4b78d18 | 539 | |
2aec968d L |
540 | /* FIXME: einfo should support %lld. */ |
541 | if ((off_t) size != input->filesize) | |
df5f2391 | 542 | einfo (_("%F%P: unsupported input file size: %s (%ld bytes)\n"), |
2aec968d | 543 | input->name, (long) input->filesize); |
f4b78d18 | 544 | |
2aec968d L |
545 | /* Check the cached view buffer. */ |
546 | if (input->view_buffer.addr != NULL | |
547 | && input->view_buffer.filesize == size | |
38604796 | 548 | && input->view_buffer.offset == offset) |
2aec968d L |
549 | { |
550 | *viewp = input->view_buffer.addr; | |
551 | return LDPS_OK; | |
552 | } | |
553 | ||
554 | input->view_buffer.filesize = size; | |
38604796 | 555 | input->view_buffer.offset = offset; |
f4b78d18 | 556 | |
2aec968d | 557 | #if HAVE_MMAP |
fe905789 | 558 | # if HAVE_GETPAGESIZE |
38604796 L |
559 | bias = offset % plugin_pagesize; |
560 | offset -= bias; | |
fe905789 L |
561 | size += bias; |
562 | # endif | |
563 | buffer = mmap (NULL, size, PROT_READ, MAP_PRIVATE, input->fd, offset); | |
564 | if (buffer != MAP_FAILED) | |
38604796 L |
565 | { |
566 | input->use_mmap = TRUE; | |
567 | # if HAVE_GETPAGESIZE | |
568 | buffer += bias; | |
b677c456 | 569 | # endif |
38604796 L |
570 | } |
571 | else | |
2aec968d | 572 | #endif |
f4b78d18 | 573 | { |
2aec968d L |
574 | char *p; |
575 | ||
38604796 L |
576 | input->use_mmap = FALSE; |
577 | ||
578 | if (lseek (input->fd, offset, SEEK_SET) < 0) | |
2aec968d L |
579 | return LDPS_ERR; |
580 | ||
581 | buffer = bfd_alloc (input->abfd, size); | |
582 | if (buffer == NULL) | |
583 | return LDPS_ERR; | |
584 | ||
585 | p = buffer; | |
586 | do | |
f4b78d18 | 587 | { |
2aec968d L |
588 | ssize_t got = read (input->fd, p, size); |
589 | if (got == 0) | |
590 | break; | |
591 | else if (got > 0) | |
592 | { | |
593 | p += got; | |
594 | size -= got; | |
595 | } | |
596 | else if (errno != EINTR) | |
597 | return LDPS_ERR; | |
f4b78d18 | 598 | } |
2aec968d | 599 | while (size > 0); |
f4b78d18 | 600 | } |
2aec968d L |
601 | |
602 | input->view_buffer.addr = buffer; | |
603 | *viewp = buffer; | |
f4b78d18 L |
604 | |
605 | return LDPS_OK; | |
15f7a26b L |
606 | } |
607 | ||
5d3236ee DK |
608 | /* Release the input file. */ |
609 | static enum ld_plugin_status | |
f4b78d18 | 610 | release_input_file (const void *handle) |
5d3236ee | 611 | { |
119d62ff | 612 | plugin_input_file_t *input = (plugin_input_file_t *) handle; |
5d3236ee | 613 | ASSERT (called_plugin); |
f4b78d18 | 614 | if (input->fd != -1) |
119d62ff L |
615 | { |
616 | close (input->fd); | |
617 | input->fd = -1; | |
618 | } | |
f4b78d18 | 619 | return LDPS_OK; |
5d3236ee DK |
620 | } |
621 | ||
42a851a9 DK |
622 | /* Return TRUE if a defined symbol might be reachable from outside the |
623 | universe of claimed objects. */ | |
624 | static inline bfd_boolean | |
9bbc1a67 | 625 | is_visible_from_outside (struct ld_plugin_symbol *lsym, |
f84854b6 | 626 | struct bfd_link_hash_entry *blhe) |
42a851a9 | 627 | { |
0e1862bb | 628 | if (bfd_link_relocatable (&link_info)) |
42a851a9 | 629 | return TRUE; |
4070765b | 630 | if (blhe->non_ir_ref_dynamic |
59fa66c5 L |
631 | || link_info.export_dynamic |
632 | || bfd_link_dll (&link_info)) | |
42a851a9 | 633 | { |
fd91d419 L |
634 | /* Check if symbol is hidden by version script. */ |
635 | if (bfd_hide_sym_by_version (link_info.version_info, | |
636 | blhe->root.string)) | |
637 | return FALSE; | |
42a851a9 DK |
638 | /* Only ELF symbols really have visibility. */ |
639 | if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour) | |
640 | { | |
641 | struct elf_link_hash_entry *el = (struct elf_link_hash_entry *)blhe; | |
642 | int vis = ELF_ST_VISIBILITY (el->other); | |
643 | return vis == STV_DEFAULT || vis == STV_PROTECTED; | |
644 | } | |
645 | /* On non-ELF targets, we can safely make inferences by considering | |
f84854b6 | 646 | what visibility the plugin would have liked to apply when it first |
42a851a9 DK |
647 | sent us the symbol. During ELF symbol processing, visibility only |
648 | ever becomes more restrictive, not less, when symbols are merged, | |
649 | so this is a conservative estimate; it may give false positives, | |
650 | declaring something visible from outside when it in fact would | |
651 | not have been, but this will only lead to missed optimisation | |
652 | opportunities during LTRANS at worst; it will not give false | |
653 | negatives, which can lead to the disastrous conclusion that the | |
654 | related symbol is IRONLY. (See GCC PR46319 for an example.) */ | |
cfac8028 L |
655 | return (lsym->visibility == LDPV_DEFAULT |
656 | || lsym->visibility == LDPV_PROTECTED); | |
42a851a9 | 657 | } |
35ed3f94 | 658 | |
42a851a9 DK |
659 | return FALSE; |
660 | } | |
661 | ||
8e5cb9a5 | 662 | /* Return LTO kind string name that corresponds to IDX enum value. */ |
7ea79cb3 | 663 | static const char * |
8e5cb9a5 | 664 | get_lto_kind (unsigned int idx) |
7ea79cb3 | 665 | { |
666 | static char buffer[64]; | |
667 | const char *lto_kind_str[5] = | |
668 | { | |
669 | "DEF", | |
670 | "WEAKDEF", | |
671 | "UNDEF", | |
672 | "WEAKUNDEF", | |
673 | "COMMON" | |
674 | }; | |
675 | ||
8e5cb9a5 JB |
676 | if (idx < ARRAY_SIZE (lto_kind_str)) |
677 | return lto_kind_str [idx]; | |
7ea79cb3 | 678 | |
8e5cb9a5 | 679 | sprintf (buffer, _("unknown LTO kind value %x"), idx); |
7ea79cb3 | 680 | return buffer; |
681 | } | |
682 | ||
8e5cb9a5 | 683 | /* Return LTO resolution string name that corresponds to IDX enum value. */ |
7ea79cb3 | 684 | static const char * |
8e5cb9a5 | 685 | get_lto_resolution (unsigned int idx) |
7ea79cb3 | 686 | { |
687 | static char buffer[64]; | |
688 | static const char *lto_resolution_str[10] = | |
689 | { | |
690 | "UNKNOWN", | |
691 | "UNDEF", | |
692 | "PREVAILING_DEF", | |
693 | "PREVAILING_DEF_IRONLY", | |
694 | "PREEMPTED_REG", | |
695 | "PREEMPTED_IR", | |
696 | "RESOLVED_IR", | |
697 | "RESOLVED_EXEC", | |
698 | "RESOLVED_DYN", | |
699 | "PREVAILING_DEF_IRONLY_EXP", | |
700 | }; | |
701 | ||
8e5cb9a5 JB |
702 | if (idx < ARRAY_SIZE (lto_resolution_str)) |
703 | return lto_resolution_str [idx]; | |
7ea79cb3 | 704 | |
8e5cb9a5 | 705 | sprintf (buffer, _("unknown LTO resolution value %x"), idx); |
7ea79cb3 | 706 | return buffer; |
707 | } | |
708 | ||
8e5cb9a5 | 709 | /* Return LTO visibility string name that corresponds to IDX enum value. */ |
7ea79cb3 | 710 | static const char * |
8e5cb9a5 | 711 | get_lto_visibility (unsigned int idx) |
7ea79cb3 | 712 | { |
713 | static char buffer[64]; | |
714 | const char *lto_visibility_str[4] = | |
715 | { | |
716 | "DEFAULT", | |
717 | "PROTECTED", | |
718 | "INTERNAL", | |
719 | "HIDDEN" | |
720 | }; | |
721 | ||
8e5cb9a5 JB |
722 | if (idx < ARRAY_SIZE (lto_visibility_str)) |
723 | return lto_visibility_str [idx]; | |
7ea79cb3 | 724 | |
8e5cb9a5 | 725 | sprintf (buffer, _("unknown LTO visibility value %x"), idx); |
7ea79cb3 | 726 | return buffer; |
727 | } | |
728 | ||
5d3236ee DK |
729 | /* Get the symbol resolution info for a plugin-claimed input file. */ |
730 | static enum ld_plugin_status | |
69ee6ab2 AM |
731 | get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms, |
732 | int def_ironly_exp) | |
5d3236ee | 733 | { |
f4b78d18 L |
734 | const plugin_input_file_t *input = handle; |
735 | const bfd *abfd = (const bfd *) input->abfd; | |
5d3236ee | 736 | int n; |
69ee6ab2 | 737 | |
5d3236ee DK |
738 | ASSERT (called_plugin); |
739 | for (n = 0; n < nsyms; n++) | |
740 | { | |
741 | struct bfd_link_hash_entry *blhe; | |
42a851a9 | 742 | asection *owner_sec; |
69ee6ab2 | 743 | int res; |
6fe014bc L |
744 | struct bfd_link_hash_entry *h |
745 | = bfd_link_hash_lookup (link_info.hash, syms[n].name, | |
746 | FALSE, FALSE, TRUE); | |
747 | enum { wrap_none, wrapper, wrapped } wrap_status = wrap_none; | |
69ee6ab2 | 748 | |
6fe014bc L |
749 | if (syms[n].def != LDPK_UNDEF && syms[n].def != LDPK_WEAKUNDEF) |
750 | { | |
751 | blhe = h; | |
a78fca7b | 752 | if (blhe && link_info.wrap_hash != NULL) |
6fe014bc L |
753 | { |
754 | /* Check if a symbol is a wrapper symbol. */ | |
755 | struct bfd_link_hash_entry *unwrap | |
756 | = unwrap_hash_lookup (&link_info, (bfd *) abfd, blhe); | |
757 | if (unwrap && unwrap != h) | |
758 | wrap_status = wrapper; | |
759 | } | |
760 | } | |
10be1b6a | 761 | else |
6fe014bc L |
762 | { |
763 | blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, | |
764 | &link_info, syms[n].name, | |
765 | FALSE, FALSE, TRUE); | |
766 | /* Check if a symbol is a wrapped symbol. */ | |
767 | if (blhe && blhe != h) | |
768 | wrap_status = wrapped; | |
769 | } | |
5d3236ee DK |
770 | if (!blhe) |
771 | { | |
3355cb3b L |
772 | /* The plugin is called to claim symbols in an archive element |
773 | from plugin_object_p. But those symbols aren't needed to | |
774 | create output. They are defined and referenced only within | |
775 | IR. */ | |
776 | switch (syms[n].def) | |
777 | { | |
778 | default: | |
779 | abort (); | |
780 | case LDPK_UNDEF: | |
781 | case LDPK_WEAKUNDEF: | |
782 | res = LDPR_UNDEF; | |
783 | break; | |
784 | case LDPK_DEF: | |
785 | case LDPK_WEAKDEF: | |
786 | case LDPK_COMMON: | |
787 | res = LDPR_PREVAILING_DEF_IRONLY; | |
788 | break; | |
789 | } | |
1715a13c | 790 | goto report_symbol; |
5d3236ee DK |
791 | } |
792 | ||
793 | /* Determine resolution from blhe type and symbol's original type. */ | |
794 | if (blhe->type == bfd_link_hash_undefined | |
f84854b6 | 795 | || blhe->type == bfd_link_hash_undefweak) |
5d3236ee | 796 | { |
69ee6ab2 | 797 | res = LDPR_UNDEF; |
1715a13c | 798 | goto report_symbol; |
5d3236ee DK |
799 | } |
800 | if (blhe->type != bfd_link_hash_defined | |
f84854b6 L |
801 | && blhe->type != bfd_link_hash_defweak |
802 | && blhe->type != bfd_link_hash_common) | |
5d3236ee DK |
803 | { |
804 | /* We should not have a new, indirect or warning symbol here. */ | |
df5f2391 | 805 | einfo (_("%F%P: %s: plugin symbol table corrupt (sym type %d)\n"), |
f84854b6 | 806 | called_plugin->name, blhe->type); |
5d3236ee DK |
807 | } |
808 | ||
42a851a9 DK |
809 | /* Find out which section owns the symbol. Since it's not undef, |
810 | it must have an owner; if it's not a common symbol, both defs | |
811 | and weakdefs keep it in the same place. */ | |
9e2278f5 AM |
812 | owner_sec = (blhe->type == bfd_link_hash_common |
813 | ? blhe->u.c.p->section | |
814 | : blhe->u.def.section); | |
42a851a9 | 815 | |
5d3236ee DK |
816 | |
817 | /* If it was originally undefined or common, then it has been | |
f84854b6 L |
818 | resolved; determine how. */ |
819 | if (syms[n].def == LDPK_UNDEF | |
820 | || syms[n].def == LDPK_WEAKUNDEF | |
5d3236ee DK |
821 | || syms[n].def == LDPK_COMMON) |
822 | { | |
5d3236ee | 823 | if (owner_sec->owner == link_info.output_bfd) |
69ee6ab2 | 824 | res = LDPR_RESOLVED_EXEC; |
5d3236ee | 825 | else if (owner_sec->owner == abfd) |
69ee6ab2 | 826 | res = LDPR_PREVAILING_DEF_IRONLY; |
5d3236ee | 827 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
69ee6ab2 | 828 | res = LDPR_RESOLVED_IR; |
cc322803 L |
829 | else if (owner_sec->owner != NULL |
830 | && (owner_sec->owner->flags & DYNAMIC) != 0) | |
69ee6ab2 | 831 | res = LDPR_RESOLVED_DYN; |
5d3236ee | 832 | else |
69ee6ab2 | 833 | res = LDPR_RESOLVED_EXEC; |
5d3236ee DK |
834 | } |
835 | ||
836 | /* Was originally def, or weakdef. Does it prevail? If the | |
f84854b6 | 837 | owner is the original dummy bfd that supplied it, then this |
5d3236ee | 838 | is the definition that has prevailed. */ |
69ee6ab2 AM |
839 | else if (owner_sec->owner == link_info.output_bfd) |
840 | res = LDPR_PREEMPTED_REG; | |
42a851a9 | 841 | else if (owner_sec->owner == abfd) |
69ee6ab2 | 842 | res = LDPR_PREVAILING_DEF_IRONLY; |
5d3236ee DK |
843 | |
844 | /* Was originally def, weakdef, or common, but has been pre-empted. */ | |
69ee6ab2 AM |
845 | else if (is_ir_dummy_bfd (owner_sec->owner)) |
846 | res = LDPR_PREEMPTED_IR; | |
847 | else | |
848 | res = LDPR_PREEMPTED_REG; | |
849 | ||
850 | if (res == LDPR_PREVAILING_DEF_IRONLY) | |
851 | { | |
852 | /* We need to know if the sym is referenced from non-IR files. Or | |
853 | even potentially-referenced, perhaps in a future final link if | |
854 | this is a partial one, perhaps dynamically at load-time if the | |
6fe014bc L |
855 | symbol is externally visible. Also check for wrapper symbol. */ |
856 | if (blhe->non_ir_ref_regular || wrap_status == wrapper) | |
69ee6ab2 | 857 | res = LDPR_PREVAILING_DEF; |
6fe014bc L |
858 | else if (wrap_status == wrapped) |
859 | res = LDPR_RESOLVED_IR; | |
9bbc1a67 | 860 | else if (is_visible_from_outside (&syms[n], blhe)) |
69ee6ab2 AM |
861 | res = def_ironly_exp; |
862 | } | |
1715a13c | 863 | |
9e2278f5 | 864 | report_symbol: |
69ee6ab2 | 865 | syms[n].resolution = res; |
1715a13c | 866 | if (report_plugin_symbols) |
871b3ab2 | 867 | einfo (_("%P: %pB: symbol `%s' " |
7ea79cb3 | 868 | "definition: %s, visibility: %s, resolution: %s\n"), |
9e2278f5 | 869 | abfd, syms[n].name, |
7ea79cb3 | 870 | get_lto_kind (syms[n].def), |
871 | get_lto_visibility (syms[n].visibility), | |
872 | get_lto_resolution (res)); | |
5d3236ee DK |
873 | } |
874 | return LDPS_OK; | |
875 | } | |
876 | ||
69ee6ab2 AM |
877 | static enum ld_plugin_status |
878 | get_symbols_v1 (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
879 | { | |
880 | return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF); | |
881 | } | |
882 | ||
883 | static enum ld_plugin_status | |
884 | get_symbols_v2 (const void *handle, int nsyms, struct ld_plugin_symbol *syms) | |
885 | { | |
886 | return get_symbols (handle, nsyms, syms, LDPR_PREVAILING_DEF_IRONLY_EXP); | |
887 | } | |
888 | ||
5d3236ee DK |
889 | /* Add a new (real) input file generated by a plugin. */ |
890 | static enum ld_plugin_status | |
891 | add_input_file (const char *pathname) | |
892 | { | |
ce875075 AM |
893 | lang_input_statement_type *is; |
894 | ||
5d3236ee | 895 | ASSERT (called_plugin); |
ce875075 AM |
896 | is = lang_add_input_file (xstrdup (pathname), lang_input_file_is_file_enum, |
897 | NULL); | |
898 | if (!is) | |
5d3236ee | 899 | return LDPS_ERR; |
ce875075 | 900 | is->flags.lto_output = 1; |
5d3236ee DK |
901 | return LDPS_OK; |
902 | } | |
903 | ||
904 | /* Add a new (real) library required by a plugin. */ | |
905 | static enum ld_plugin_status | |
906 | add_input_library (const char *pathname) | |
907 | { | |
ce875075 AM |
908 | lang_input_statement_type *is; |
909 | ||
5d3236ee | 910 | ASSERT (called_plugin); |
ce875075 AM |
911 | is = lang_add_input_file (xstrdup (pathname), lang_input_file_is_l_enum, |
912 | NULL); | |
913 | if (!is) | |
5d3236ee | 914 | return LDPS_ERR; |
ce875075 | 915 | is->flags.lto_output = 1; |
5d3236ee DK |
916 | return LDPS_OK; |
917 | } | |
918 | ||
919 | /* Set the extra library path to be used by libraries added via | |
920 | add_input_library. */ | |
921 | static enum ld_plugin_status | |
922 | set_extra_library_path (const char *path) | |
923 | { | |
924 | ASSERT (called_plugin); | |
d4cb7acd | 925 | ldfile_add_library_path (xstrdup (path), FALSE); |
5d3236ee DK |
926 | return LDPS_OK; |
927 | } | |
928 | ||
929 | /* Issue a diagnostic message from a plugin. */ | |
930 | static enum ld_plugin_status | |
931 | message (int level, const char *format, ...) | |
932 | { | |
933 | va_list args; | |
934 | va_start (args, format); | |
935 | ||
936 | switch (level) | |
937 | { | |
938 | case LDPL_INFO: | |
939 | vfinfo (stdout, format, args, FALSE); | |
d251c5c4 | 940 | putchar ('\n'); |
5d3236ee DK |
941 | break; |
942 | case LDPL_WARNING: | |
45e81354 | 943 | { |
df5f2391 | 944 | char *newfmt = concat (_("%P: warning: "), format, "\n", |
e1fa0163 | 945 | (const char *) NULL); |
45e81354 | 946 | vfinfo (stdout, newfmt, args, TRUE); |
e1fa0163 | 947 | free (newfmt); |
45e81354 | 948 | } |
5d3236ee DK |
949 | break; |
950 | case LDPL_FATAL: | |
951 | case LDPL_ERROR: | |
952 | default: | |
9e2278f5 | 953 | { |
df5f2391 AM |
954 | char *newfmt = concat (level == LDPL_FATAL ? "%F" : "%X", |
955 | _("%P: error: "), format, "\n", | |
e1fa0163 | 956 | (const char *) NULL); |
9e2278f5 AM |
957 | fflush (stdout); |
958 | vfinfo (stderr, newfmt, args, TRUE); | |
959 | fflush (stderr); | |
e1fa0163 | 960 | free (newfmt); |
9e2278f5 | 961 | } |
5d3236ee DK |
962 | break; |
963 | } | |
964 | ||
965 | va_end (args); | |
966 | return LDPS_OK; | |
967 | } | |
968 | ||
969 | /* Helper to size leading part of tv array and set it up. */ | |
69ee6ab2 | 970 | static void |
5d3236ee DK |
971 | set_tv_header (struct ld_plugin_tv *tv) |
972 | { | |
973 | size_t i; | |
974 | ||
975 | /* Version info. */ | |
976 | static const unsigned int major = (unsigned)(BFD_VERSION / 100000000UL); | |
977 | static const unsigned int minor = (unsigned)(BFD_VERSION / 1000000UL) % 100; | |
978 | ||
5d3236ee DK |
979 | for (i = 0; i < tv_header_size; i++) |
980 | { | |
981 | tv[i].tv_tag = tv_header_tags[i]; | |
982 | #define TVU(x) tv[i].tv_u.tv_ ## x | |
983 | switch (tv[i].tv_tag) | |
984 | { | |
f84854b6 L |
985 | case LDPT_MESSAGE: |
986 | TVU(message) = message; | |
987 | break; | |
988 | case LDPT_API_VERSION: | |
989 | TVU(val) = LD_PLUGIN_API_VERSION; | |
990 | break; | |
991 | case LDPT_GNU_LD_VERSION: | |
992 | TVU(val) = major * 100 + minor; | |
993 | break; | |
994 | case LDPT_LINKER_OUTPUT: | |
64d94ba0 AM |
995 | TVU(val) = (bfd_link_relocatable (&link_info) ? LDPO_REL |
996 | : bfd_link_pde (&link_info) ? LDPO_EXEC | |
997 | : bfd_link_pie (&link_info) ? LDPO_PIE | |
998 | : LDPO_DYN); | |
f84854b6 L |
999 | break; |
1000 | case LDPT_OUTPUT_NAME: | |
1001 | TVU(string) = output_filename; | |
1002 | break; | |
1003 | case LDPT_REGISTER_CLAIM_FILE_HOOK: | |
1004 | TVU(register_claim_file) = register_claim_file; | |
1005 | break; | |
1006 | case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: | |
1007 | TVU(register_all_symbols_read) = register_all_symbols_read; | |
1008 | break; | |
1009 | case LDPT_REGISTER_CLEANUP_HOOK: | |
1010 | TVU(register_cleanup) = register_cleanup; | |
1011 | break; | |
1012 | case LDPT_ADD_SYMBOLS: | |
1013 | TVU(add_symbols) = add_symbols; | |
1014 | break; | |
1015 | case LDPT_GET_INPUT_FILE: | |
1016 | TVU(get_input_file) = get_input_file; | |
1017 | break; | |
15f7a26b L |
1018 | case LDPT_GET_VIEW: |
1019 | TVU(get_view) = get_view; | |
1020 | break; | |
f84854b6 L |
1021 | case LDPT_RELEASE_INPUT_FILE: |
1022 | TVU(release_input_file) = release_input_file; | |
1023 | break; | |
1024 | case LDPT_GET_SYMBOLS: | |
69ee6ab2 AM |
1025 | TVU(get_symbols) = get_symbols_v1; |
1026 | break; | |
1027 | case LDPT_GET_SYMBOLS_V2: | |
1028 | TVU(get_symbols) = get_symbols_v2; | |
f84854b6 L |
1029 | break; |
1030 | case LDPT_ADD_INPUT_FILE: | |
1031 | TVU(add_input_file) = add_input_file; | |
1032 | break; | |
1033 | case LDPT_ADD_INPUT_LIBRARY: | |
1034 | TVU(add_input_library) = add_input_library; | |
1035 | break; | |
1036 | case LDPT_SET_EXTRA_LIBRARY_PATH: | |
1037 | TVU(set_extra_library_path) = set_extra_library_path; | |
1038 | break; | |
1039 | default: | |
1040 | /* Added a new entry to the array without adding | |
1041 | a new case to set up its value is a bug. */ | |
1042 | FAIL (); | |
5d3236ee DK |
1043 | } |
1044 | #undef TVU | |
1045 | } | |
5d3236ee DK |
1046 | } |
1047 | ||
1048 | /* Append the per-plugin args list and trailing LDPT_NULL to tv. */ | |
1049 | static void | |
1050 | set_tv_plugin_args (plugin_t *plugin, struct ld_plugin_tv *tv) | |
1051 | { | |
1052 | plugin_arg_t *arg = plugin->args; | |
1053 | while (arg) | |
1054 | { | |
1055 | tv->tv_tag = LDPT_OPTION; | |
1056 | tv->tv_u.tv_string = arg->arg; | |
1057 | arg = arg->next; | |
1058 | tv++; | |
1059 | } | |
1060 | tv->tv_tag = LDPT_NULL; | |
1061 | tv->tv_u.tv_val = 0; | |
1062 | } | |
1063 | ||
1064 | /* Load up and initialise all plugins after argument parsing. */ | |
d82184d7 | 1065 | void |
d44ad554 | 1066 | plugin_load_plugins (void) |
5d3236ee DK |
1067 | { |
1068 | struct ld_plugin_tv *my_tv; | |
1069 | unsigned int max_args = 0; | |
1070 | plugin_t *curplug = plugins_list; | |
1071 | ||
1072 | /* If there are no plugins, we need do nothing this run. */ | |
1073 | if (!curplug) | |
d82184d7 | 1074 | return; |
5d3236ee DK |
1075 | |
1076 | /* First pass over plugins to find max # args needed so that we | |
1077 | can size and allocate the tv array. */ | |
1078 | while (curplug) | |
1079 | { | |
1080 | if (curplug->n_args > max_args) | |
1081 | max_args = curplug->n_args; | |
1082 | curplug = curplug->next; | |
1083 | } | |
1084 | ||
1085 | /* Allocate tv array and initialise constant part. */ | |
1086 | my_tv = xmalloc ((max_args + 1 + tv_header_size) * sizeof *my_tv); | |
1087 | set_tv_header (my_tv); | |
1088 | ||
1089 | /* Pass over plugins again, activating them. */ | |
1090 | curplug = plugins_list; | |
1091 | while (curplug) | |
1092 | { | |
1093 | enum ld_plugin_status rv; | |
a8f9d13e AM |
1094 | ld_plugin_onload onloadfn; |
1095 | ||
1096 | onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "onload"); | |
5d3236ee | 1097 | if (!onloadfn) |
a8f9d13e | 1098 | onloadfn = (ld_plugin_onload) dlsym (curplug->dlhandle, "_onload"); |
5d3236ee | 1099 | if (!onloadfn) |
df5f2391 | 1100 | einfo (_("%F%P: %s: error loading plugin: %s\n"), |
d82184d7 | 1101 | curplug->name, dlerror ()); |
5d3236ee DK |
1102 | set_tv_plugin_args (curplug, &my_tv[tv_header_size]); |
1103 | called_plugin = curplug; | |
1104 | rv = (*onloadfn) (my_tv); | |
1105 | called_plugin = NULL; | |
1106 | if (rv != LDPS_OK) | |
df5f2391 | 1107 | einfo (_("%F%P: %s: plugin error: %d\n"), curplug->name, rv); |
5d3236ee DK |
1108 | curplug = curplug->next; |
1109 | } | |
1110 | ||
1111 | /* Since plugin(s) inited ok, assume they're going to want symbol | |
1112 | resolutions, which needs us to track which symbols are referenced | |
1113 | by non-IR files using the linker's notice callback. */ | |
9e2278f5 AM |
1114 | orig_notice_all = link_info.notice_all; |
1115 | orig_callbacks = link_info.callbacks; | |
1116 | plugin_callbacks = *orig_callbacks; | |
1117 | plugin_callbacks.notice = &plugin_notice; | |
5d3236ee | 1118 | link_info.notice_all = TRUE; |
61f41c3c | 1119 | link_info.lto_plugin_active = TRUE; |
9e2278f5 | 1120 | link_info.callbacks = &plugin_callbacks; |
38604796 | 1121 | |
5ae0078c L |
1122 | register_ld_plugin_object_p (plugin_object_p); |
1123 | ||
38604796 | 1124 | #if HAVE_MMAP && HAVE_GETPAGESIZE |
fd5a1509 | 1125 | plugin_pagesize = getpagesize (); |
38604796 | 1126 | #endif |
5d3236ee DK |
1127 | } |
1128 | ||
1129 | /* Call 'claim file' hook for all plugins. */ | |
02d00247 | 1130 | static int |
5d3236ee DK |
1131 | plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed) |
1132 | { | |
1133 | plugin_t *curplug = plugins_list; | |
1134 | *claimed = FALSE; | |
5d3236ee DK |
1135 | while (curplug && !*claimed) |
1136 | { | |
1137 | if (curplug->claim_file_handler) | |
1138 | { | |
1139 | enum ld_plugin_status rv; | |
ace667e5 | 1140 | |
5d3236ee DK |
1141 | called_plugin = curplug; |
1142 | rv = (*curplug->claim_file_handler) (file, claimed); | |
1143 | called_plugin = NULL; | |
1144 | if (rv != LDPS_OK) | |
1145 | set_plugin_error (curplug->name); | |
1146 | } | |
1147 | curplug = curplug->next; | |
1148 | } | |
1149 | return plugin_error_p () ? -1 : 0; | |
1150 | } | |
1151 | ||
35a1e5f3 L |
1152 | /* Duplicates a character string with memory attached to ABFD. */ |
1153 | ||
1154 | static char * | |
1155 | plugin_strdup (bfd *abfd, const char *str) | |
1156 | { | |
1157 | size_t strlength; | |
1158 | char *copy; | |
1159 | strlength = strlen (str) + 1; | |
1160 | copy = bfd_alloc (abfd, strlength); | |
1161 | if (copy == NULL) | |
df5f2391 | 1162 | einfo (_("%F%P: plugin_strdup failed to allocate memory: %s\n"), |
35a1e5f3 L |
1163 | bfd_get_error ()); |
1164 | memcpy (copy, str, strlength); | |
1165 | return copy; | |
1166 | } | |
1167 | ||
5ae0078c L |
1168 | static const bfd_target * |
1169 | plugin_object_p (bfd *ibfd) | |
02d00247 | 1170 | { |
5ae0078c | 1171 | int claimed; |
f4b78d18 | 1172 | plugin_input_file_t *input; |
35a1e5f3 L |
1173 | struct ld_plugin_input_file file; |
1174 | bfd *abfd; | |
5ae0078c L |
1175 | |
1176 | /* Don't try the dummy object file. */ | |
1177 | if ((ibfd->flags & BFD_PLUGIN) != 0) | |
1178 | return NULL; | |
1179 | ||
49f30d83 | 1180 | if (ibfd->plugin_format != bfd_plugin_unknown) |
5ae0078c L |
1181 | { |
1182 | if (ibfd->plugin_format == bfd_plugin_yes) | |
1183 | return ibfd->plugin_dummy_bfd->xvec; | |
1184 | else | |
1185 | return NULL; | |
1186 | } | |
1187 | ||
02d00247 AM |
1188 | /* We create a dummy BFD, initially empty, to house whatever symbols |
1189 | the plugin may want to add. */ | |
35a1e5f3 | 1190 | abfd = plugin_get_ir_dummy_bfd (ibfd->filename, ibfd); |
f4b78d18 L |
1191 | |
1192 | input = bfd_alloc (abfd, sizeof (*input)); | |
1193 | if (input == NULL) | |
df5f2391 | 1194 | einfo (_("%F%P: plugin failed to allocate memory for input: %s\n"), |
f4b78d18 L |
1195 | bfd_get_error ()); |
1196 | ||
7d0b9ebc AM |
1197 | if (!bfd_plugin_open_input (ibfd, &file)) |
1198 | return NULL; | |
35a1e5f3 | 1199 | |
7d0b9ebc AM |
1200 | if (file.name == ibfd->filename) |
1201 | { | |
35a1e5f3 L |
1202 | /* We must copy filename attached to ibfd if it is not an archive |
1203 | member since it may be freed by bfd_close below. */ | |
7d0b9ebc | 1204 | file.name = plugin_strdup (abfd, file.name); |
35a1e5f3 L |
1205 | } |
1206 | ||
35a1e5f3 | 1207 | file.handle = input; |
f4b78d18 | 1208 | input->abfd = abfd; |
2aec968d L |
1209 | input->view_buffer.addr = NULL; |
1210 | input->view_buffer.filesize = 0; | |
1211 | input->view_buffer.offset = 0; | |
7d0b9ebc | 1212 | input->fd = file.fd; |
d319a098 | 1213 | input->use_mmap = FALSE; |
7d0b9ebc AM |
1214 | input->offset = file.offset; |
1215 | input->filesize = file.filesize; | |
35a1e5f3 | 1216 | input->name = plugin_strdup (abfd, ibfd->filename); |
f4b78d18 | 1217 | |
5ae0078c L |
1218 | claimed = 0; |
1219 | ||
35a1e5f3 | 1220 | if (plugin_call_claim_file (&file, &claimed)) |
df5f2391 | 1221 | einfo (_("%F%P: %s: plugin reported error claiming file\n"), |
02d00247 | 1222 | plugin_error_plugin ()); |
f4b78d18 | 1223 | |
7d0b9ebc | 1224 | if (input->fd != -1 && !bfd_plugin_target_p (ibfd->xvec)) |
f4b78d18 | 1225 | { |
5ae0078c L |
1226 | /* FIXME: fd belongs to us, not the plugin. GCC plugin, which |
1227 | doesn't need fd after plugin_call_claim_file, doesn't use | |
1228 | BFD plugin target vector. Since GCC plugin doesn't call | |
1229 | release_input_file, we close it here. LLVM plugin, which | |
1230 | needs fd after plugin_call_claim_file and calls | |
1231 | release_input_file after it is done, uses BFD plugin target | |
1232 | vector. This scheme doesn't work when a plugin needs fd and | |
1233 | doesn't use BFD plugin target vector neither. */ | |
7d0b9ebc | 1234 | close (input->fd); |
f4b78d18 L |
1235 | input->fd = -1; |
1236 | } | |
1237 | ||
02d00247 AM |
1238 | if (claimed) |
1239 | { | |
5ae0078c L |
1240 | ibfd->plugin_format = bfd_plugin_yes; |
1241 | ibfd->plugin_dummy_bfd = abfd; | |
35a1e5f3 | 1242 | bfd_make_readable (abfd); |
5ae0078c | 1243 | return abfd->xvec; |
02d00247 AM |
1244 | } |
1245 | else | |
1246 | { | |
38604796 L |
1247 | #if HAVE_MMAP |
1248 | if (input->use_mmap) | |
1249 | { | |
1250 | /* If plugin didn't claim the file, unmap the buffer. */ | |
1251 | char *addr = input->view_buffer.addr; | |
1252 | off_t size = input->view_buffer.filesize; | |
1253 | # if HAVE_GETPAGESIZE | |
1254 | off_t bias = input->view_buffer.offset % plugin_pagesize; | |
1255 | size += bias; | |
1256 | addr -= bias; | |
1257 | # endif | |
1258 | munmap (addr, size); | |
1259 | } | |
1260 | #endif | |
1261 | ||
02d00247 AM |
1262 | /* If plugin didn't claim the file, we don't need the dummy bfd. |
1263 | Can't avoid speculatively creating it, alas. */ | |
5ae0078c | 1264 | ibfd->plugin_format = bfd_plugin_no; |
f4b78d18 | 1265 | bfd_close_all_done (abfd); |
5ae0078c L |
1266 | return NULL; |
1267 | } | |
1268 | } | |
1269 | ||
1270 | void | |
1271 | plugin_maybe_claim (lang_input_statement_type *entry) | |
1272 | { | |
fb47deda | 1273 | ASSERT (entry->header.type == lang_input_statement_enum); |
5ae0078c L |
1274 | if (plugin_object_p (entry->the_bfd)) |
1275 | { | |
1276 | bfd *abfd = entry->the_bfd->plugin_dummy_bfd; | |
1277 | ||
1278 | /* Discard the real file's BFD and substitute the dummy one. */ | |
1279 | ||
b0cffb47 AM |
1280 | /* We can't call bfd_close on archives. BFD archive handling |
1281 | caches elements, and add_archive_element keeps pointers to | |
1282 | the_bfd and the_bfd->filename in a lang_input_statement_type | |
1283 | linker script statement. */ | |
5ae0078c L |
1284 | if (entry->the_bfd->my_archive == NULL) |
1285 | bfd_close (entry->the_bfd); | |
1286 | entry->the_bfd = abfd; | |
1287 | entry->flags.claimed = 1; | |
02d00247 AM |
1288 | } |
1289 | } | |
1290 | ||
5d3236ee DK |
1291 | /* Call 'all symbols read' hook for all plugins. */ |
1292 | int | |
1293 | plugin_call_all_symbols_read (void) | |
1294 | { | |
1295 | plugin_t *curplug = plugins_list; | |
1296 | ||
1297 | /* Disable any further file-claiming. */ | |
1298 | no_more_claiming = TRUE; | |
1299 | ||
5d3236ee DK |
1300 | while (curplug) |
1301 | { | |
1302 | if (curplug->all_symbols_read_handler) | |
1303 | { | |
1304 | enum ld_plugin_status rv; | |
1305 | called_plugin = curplug; | |
1306 | rv = (*curplug->all_symbols_read_handler) (); | |
1307 | called_plugin = NULL; | |
1308 | if (rv != LDPS_OK) | |
1309 | set_plugin_error (curplug->name); | |
1310 | } | |
1311 | curplug = curplug->next; | |
1312 | } | |
1313 | return plugin_error_p () ? -1 : 0; | |
1314 | } | |
1315 | ||
e73d965c | 1316 | /* Call 'cleanup' hook for all plugins at exit. */ |
498cd2a0 | 1317 | void |
5d3236ee DK |
1318 | plugin_call_cleanup (void) |
1319 | { | |
1320 | plugin_t *curplug = plugins_list; | |
1321 | while (curplug) | |
1322 | { | |
1323 | if (curplug->cleanup_handler && !curplug->cleanup_done) | |
1324 | { | |
1325 | enum ld_plugin_status rv; | |
1326 | curplug->cleanup_done = TRUE; | |
1327 | called_plugin = curplug; | |
1328 | rv = (*curplug->cleanup_handler) (); | |
1329 | called_plugin = NULL; | |
1330 | if (rv != LDPS_OK) | |
d82184d7 L |
1331 | info_msg (_("%P: %s: error in plugin cleanup: %d (ignored)\n"), |
1332 | curplug->name, rv); | |
5d3236ee DK |
1333 | dlclose (curplug->dlhandle); |
1334 | } | |
1335 | curplug = curplug->next; | |
1336 | } | |
5d3236ee DK |
1337 | } |
1338 | ||
5d3236ee DK |
1339 | /* To determine which symbols should be resolved LDPR_PREVAILING_DEF |
1340 | and which LDPR_PREVAILING_DEF_IRONLY, we notice all the symbols as | |
35ed3f94 | 1341 | the linker adds them to the linker hash table. Mark those |
bc4e12de | 1342 | referenced from a non-IR file with non_ir_ref_regular or |
4070765b AM |
1343 | non_ir_ref_dynamic as appropriate. We have to notice_all symbols, |
1344 | because we won't necessarily know until later which ones will be | |
1345 | contributed by IR files. */ | |
9e2278f5 AM |
1346 | static bfd_boolean |
1347 | plugin_notice (struct bfd_link_info *info, | |
35ed3f94 | 1348 | struct bfd_link_hash_entry *h, |
46135103 | 1349 | struct bfd_link_hash_entry *inh, |
9e2278f5 AM |
1350 | bfd *abfd, |
1351 | asection *section, | |
16d96b5b | 1352 | bfd_vma value, |
46135103 | 1353 | flagword flags) |
5d3236ee | 1354 | { |
46135103 AM |
1355 | struct bfd_link_hash_entry *orig_h = h; |
1356 | ||
35ed3f94 | 1357 | if (h != NULL) |
5d3236ee | 1358 | { |
cd6eee13 | 1359 | bfd *sym_bfd; |
4070765b | 1360 | bfd_boolean ref = FALSE; |
cd6eee13 | 1361 | |
46135103 AM |
1362 | if (h->type == bfd_link_hash_warning) |
1363 | h = h->u.i.link; | |
1364 | ||
4a2b04a7 | 1365 | /* Nothing to do here if this def/ref is from an IR dummy BFD. */ |
9e2278f5 | 1366 | if (is_ir_dummy_bfd (abfd)) |
4a2b04a7 | 1367 | ; |
9e2278f5 | 1368 | |
16d96b5b AM |
1369 | /* Making an indirect symbol counts as a reference unless this |
1370 | is a brand new symbol. */ | |
4a2b04a7 L |
1371 | else if (bfd_is_ind_section (section) |
1372 | || (flags & BSF_INDIRECT) != 0) | |
16d96b5b | 1373 | { |
46135103 AM |
1374 | /* ??? Some of this is questionable. See comments in |
1375 | _bfd_generic_link_add_one_symbol for case IND. */ | |
4070765b AM |
1376 | if (h->type != bfd_link_hash_new |
1377 | || inh->type == bfd_link_hash_new) | |
16d96b5b | 1378 | { |
4070765b | 1379 | if ((abfd->flags & DYNAMIC) == 0) |
bc4e12de | 1380 | inh->non_ir_ref_regular = TRUE; |
4070765b AM |
1381 | else |
1382 | inh->non_ir_ref_dynamic = TRUE; | |
16d96b5b | 1383 | } |
4070765b AM |
1384 | |
1385 | if (h->type != bfd_link_hash_new) | |
1386 | ref = TRUE; | |
16d96b5b AM |
1387 | } |
1388 | ||
1389 | /* Nothing to do here for warning symbols. */ | |
1390 | else if ((flags & BSF_WARNING) != 0) | |
1391 | ; | |
1392 | ||
1393 | /* Nothing to do here for constructor symbols. */ | |
1394 | else if ((flags & BSF_CONSTRUCTOR) != 0) | |
1395 | ; | |
1396 | ||
35ed3f94 | 1397 | /* If this is a ref, set non_ir_ref. */ |
16d96b5b | 1398 | else if (bfd_is_und_section (section)) |
3d5bef4c L |
1399 | { |
1400 | /* Replace the undefined dummy bfd with the real one. */ | |
4070765b AM |
1401 | if ((h->type == bfd_link_hash_undefined |
1402 | || h->type == bfd_link_hash_undefweak) | |
1403 | && (h->u.undef.abfd == NULL | |
1404 | || (h->u.undef.abfd->flags & BFD_PLUGIN) != 0)) | |
59fa66c5 | 1405 | h->u.undef.abfd = abfd; |
4070765b | 1406 | ref = TRUE; |
3d5bef4c | 1407 | } |
35ed3f94 | 1408 | |
af4fa23f AM |
1409 | |
1410 | /* A common symbol should be merged with other commons or | |
1411 | defs with the same name. In particular, a common ought | |
1412 | to be overridden by a def in a -flto object. In that | |
1413 | sense a common is also a ref. */ | |
1414 | else if (bfd_is_com_section (section)) | |
cd6eee13 | 1415 | { |
af4fa23f AM |
1416 | if (h->type == bfd_link_hash_common |
1417 | && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner)) | |
0616a280 AM |
1418 | { |
1419 | h->type = bfd_link_hash_undefweak; | |
1420 | h->u.undef.abfd = sym_bfd; | |
1421 | } | |
af4fa23f AM |
1422 | ref = TRUE; |
1423 | } | |
4070765b | 1424 | |
af4fa23f AM |
1425 | /* Otherwise, it must be a new def. |
1426 | Ensure any symbol defined in an IR dummy BFD takes on a | |
1427 | new value from a real BFD. Weak symbols are not normally | |
1428 | overridden by a new weak definition, and strong symbols | |
1429 | will normally cause multiple definition errors. Avoid | |
1430 | this by making the symbol appear to be undefined. */ | |
1431 | else if (((h->type == bfd_link_hash_defweak | |
1432 | || h->type == bfd_link_hash_defined) | |
1433 | && is_ir_dummy_bfd (sym_bfd = h->u.def.section->owner)) | |
1434 | || (h->type == bfd_link_hash_common | |
1435 | && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner))) | |
1436 | { | |
1437 | h->type = bfd_link_hash_undefweak; | |
1438 | h->u.undef.abfd = sym_bfd; | |
4070765b AM |
1439 | } |
1440 | ||
1441 | if (ref) | |
1442 | { | |
1443 | if ((abfd->flags & DYNAMIC) == 0) | |
bc4e12de | 1444 | h->non_ir_ref_regular = TRUE; |
4070765b AM |
1445 | else |
1446 | h->non_ir_ref_dynamic = TRUE; | |
cd6eee13 | 1447 | } |
5d3236ee DK |
1448 | } |
1449 | ||
1450 | /* Continue with cref/nocrossref/trace-sym processing. */ | |
46135103 | 1451 | if (orig_h == NULL |
9e2278f5 AM |
1452 | || orig_notice_all |
1453 | || (info->notice_hash != NULL | |
46135103 | 1454 | && bfd_hash_lookup (info->notice_hash, orig_h->root.string, |
35ed3f94 | 1455 | FALSE, FALSE) != NULL)) |
46135103 AM |
1456 | return (*orig_callbacks->notice) (info, orig_h, inh, |
1457 | abfd, section, value, flags); | |
5d3236ee DK |
1458 | return TRUE; |
1459 | } |