1 /* Plugin support for BFD.
2 Copyright (C) 2009-2024 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
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 "bfd.h"
23
24 #if BFD_SUPPORTS_PLUGINS
25
26 #include <assert.h>
27 #ifdef HAVE_DLFCN_H
28 #include <dlfcn.h>
29 #elif defined (HAVE_WINDOWS_H)
30 #include <windows.h>
31 #else
32 #error Unknown how to handle dynamic-load-libraries.
33 #endif
34 #include <stdarg.h>
35 #include "plugin-api.h"
36 #include "plugin.h"
37 #include "libbfd.h"
38 #include "libiberty.h"
39 #include <dirent.h>
40
41 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
42
43 #define RTLD_NOW 0 /* Dummy value. */
44
45 static void *
dlopen(const char * file,int mode ATTRIBUTE_UNUSED)46 dlopen (const char *file, int mode ATTRIBUTE_UNUSED)
47 {
48 return LoadLibrary (file);
49 }
50
51 static void *
dlsym(void * handle,const char * name)52 dlsym (void *handle, const char *name)
53 {
54 return GetProcAddress (handle, name);
55 }
56
57 static int ATTRIBUTE_UNUSED
dlclose(void * handle)58 dlclose (void *handle)
59 {
60 FreeLibrary (handle);
61 return 0;
62 }
63
64 static const char *
dlerror(void)65 dlerror (void)
66 {
67 return "Unable to load DLL.";
68 }
69
70 #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */
71
72 #define bfd_plugin_close_and_cleanup _bfd_generic_close_and_cleanup
73 #define bfd_plugin_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
74 #define bfd_plugin_new_section_hook _bfd_generic_new_section_hook
75 #define bfd_plugin_get_section_contents _bfd_generic_get_section_contents
76 #define bfd_plugin_get_section_contents_in_window _bfd_generic_get_section_contents_in_window
77 #define bfd_plugin_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data
78 #define bfd_plugin_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data
79 #define bfd_plugin_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data
80 #define bfd_plugin_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
81 #define bfd_plugin_core_file_matches_executable_p generic_core_file_matches_executable_p
82 #define bfd_plugin_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
83 #define bfd_plugin_bfd_is_target_special_symbol _bfd_bool_bfd_asymbol_false
84 #define bfd_plugin_get_lineno _bfd_nosymbols_get_lineno
85 #define bfd_plugin_find_nearest_line _bfd_nosymbols_find_nearest_line
86 #define bfd_plugin_find_nearest_line_with_alt _bfd_nosymbols_find_nearest_line_with_alt
87 #define bfd_plugin_find_line _bfd_nosymbols_find_line
88 #define bfd_plugin_find_inliner_info _bfd_nosymbols_find_inliner_info
89 #define bfd_plugin_get_symbol_version_string _bfd_nosymbols_get_symbol_version_string
90 #define bfd_plugin_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
91 #define bfd_plugin_read_minisymbols _bfd_generic_read_minisymbols
92 #define bfd_plugin_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
93 #define bfd_plugin_set_arch_mach bfd_default_set_arch_mach
94 #define bfd_plugin_set_section_contents _bfd_generic_set_section_contents
95 #define bfd_plugin_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
96 #define bfd_plugin_bfd_relax_section bfd_generic_relax_section
97 #define bfd_plugin_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
98 #define bfd_plugin_bfd_link_add_symbols _bfd_generic_link_add_symbols
99 #define bfd_plugin_bfd_link_just_syms _bfd_generic_link_just_syms
100 #define bfd_plugin_bfd_final_link _bfd_generic_final_link
101 #define bfd_plugin_bfd_link_split_section _bfd_generic_link_split_section
102 #define bfd_plugin_bfd_gc_sections bfd_generic_gc_sections
103 #define bfd_plugin_bfd_lookup_section_flags bfd_generic_lookup_section_flags
104 #define bfd_plugin_bfd_merge_sections bfd_generic_merge_sections
105 #define bfd_plugin_bfd_is_group_section bfd_generic_is_group_section
106 #define bfd_plugin_bfd_group_name bfd_generic_group_name
107 #define bfd_plugin_bfd_discard_group bfd_generic_discard_group
108 #define bfd_plugin_section_already_linked _bfd_generic_section_already_linked
109 #define bfd_plugin_bfd_define_common_symbol bfd_generic_define_common_symbol
110 #define bfd_plugin_bfd_link_hide_symbol _bfd_generic_link_hide_symbol
111 #define bfd_plugin_bfd_define_start_stop bfd_generic_define_start_stop
112 #define bfd_plugin_bfd_copy_link_hash_symbol_type _bfd_generic_copy_link_hash_symbol_type
113 #define bfd_plugin_bfd_link_check_relocs _bfd_generic_link_check_relocs
114
115 static enum ld_plugin_status
message(int level ATTRIBUTE_UNUSED,const char * format,...)116 message (int level ATTRIBUTE_UNUSED,
117 const char * format, ...)
118 {
119 va_list args;
120 va_start (args, format);
121 printf ("bfd plugin: ");
122 vprintf (format, args);
123 putchar ('\n');
124 va_end (args);
125 return LDPS_OK;
126 }
127
128 struct plugin_list_entry
129 {
130 /* These must be initialized for each IR object with LTO wrapper. */
131 ld_plugin_claim_file_handler claim_file;
132 ld_plugin_claim_file_handler_v2 claim_file_v2;
133 ld_plugin_all_symbols_read_handler all_symbols_read;
134 ld_plugin_all_symbols_read_handler cleanup_handler;
135 bool has_symbol_type;
136
137 struct plugin_list_entry *next;
138
139 /* These can be reused for all IR objects. */
140 const char *plugin_name;
141 };
142
143 static const char *plugin_program_name;
144
145 void
bfd_plugin_set_program_name(const char * program_name)146 bfd_plugin_set_program_name (const char *program_name)
147 {
148 plugin_program_name = program_name;
149 }
150
151 static struct plugin_list_entry *plugin_list = NULL;
152 static struct plugin_list_entry *current_plugin = NULL;
153
154 /* Register a claim-file handler. */
155
156 static enum ld_plugin_status
register_claim_file(ld_plugin_claim_file_handler handler)157 register_claim_file (ld_plugin_claim_file_handler handler)
158 {
159 current_plugin->claim_file = handler;
160 return LDPS_OK;
161 }
162
163
164 /* Register a claim-file handler, version 2. */
165
166 static enum ld_plugin_status
register_claim_file_v2(ld_plugin_claim_file_handler_v2 handler)167 register_claim_file_v2 (ld_plugin_claim_file_handler_v2 handler)
168 {
169 current_plugin->claim_file_v2 = handler;
170 return LDPS_OK;
171 }
172
173 static enum ld_plugin_status
add_symbols(void * handle,int nsyms,const struct ld_plugin_symbol * syms)174 add_symbols (void * handle,
175 int nsyms,
176 const struct ld_plugin_symbol * syms)
177 {
178 bfd *abfd = handle;
179 struct plugin_data_struct *plugin_data =
180 bfd_alloc (abfd, sizeof (plugin_data_struct));
181
182 if (!plugin_data)
183 return LDPS_ERR;
184
185 plugin_data->nsyms = nsyms;
186 plugin_data->syms = syms;
187
188 if (nsyms != 0)
189 abfd->flags |= HAS_SYMS;
190
191 abfd->tdata.plugin_data = plugin_data;
192 return LDPS_OK;
193 }
194
195 static enum ld_plugin_status
add_symbols_v2(void * handle,int nsyms,const struct ld_plugin_symbol * syms)196 add_symbols_v2 (void *handle, int nsyms,
197 const struct ld_plugin_symbol *syms)
198 {
199 current_plugin->has_symbol_type = true;
200 return add_symbols (handle, nsyms, syms);
201 }
202
203 int
bfd_plugin_open_input(bfd * ibfd,struct ld_plugin_input_file * file)204 bfd_plugin_open_input (bfd *ibfd, struct ld_plugin_input_file *file)
205 {
206 bfd *iobfd;
207 int fd;
208
209 iobfd = ibfd;
210 while (iobfd->my_archive
211 && !bfd_is_thin_archive (iobfd->my_archive))
212 iobfd = iobfd->my_archive;
213 file->name = bfd_get_filename (iobfd);
214
215 if (!iobfd->iostream && !bfd_open_file (iobfd))
216 return 0;
217
218 /* Reuse the archive plugin file descriptor. */
219 if (iobfd != ibfd)
220 fd = iobfd->archive_plugin_fd;
221 else
222 fd = -1;
223
224 if (fd < 0)
225 {
226 /* The plugin API expects that the file descriptor won't be closed
227 and reused as done by the bfd file cache. So open it again.
228 dup isn't good enough. plugin IO uses lseek/read while BFD uses
229 fseek/fread. It isn't wise to mix the unistd and stdio calls on
230 the same underlying file descriptor. */
231 fd = open (file->name, O_RDONLY | O_BINARY);
232 if (fd < 0)
233 {
234 #ifndef EMFILE
235 return 0;
236 #else
237 if (errno != EMFILE)
238 return 0;
239
240 #ifdef HAVE_GETRLIMIT
241 struct rlimit lim;
242
243 /* Complicated links involving lots of files and/or large
244 archives can exhaust the number of file descriptors
245 available to us. If possible, try to allocate more
246 descriptors. */
247 if (getrlimit (RLIMIT_NOFILE, & lim) == 0
248 && lim.rlim_cur < lim.rlim_max)
249 {
250 lim.rlim_cur = lim.rlim_max;
251 if (setrlimit (RLIMIT_NOFILE, &lim) == 0)
252 fd = open (file->name, O_RDONLY | O_BINARY);
253 }
254
255 if (fd < 0)
256 #endif
257 {
258 _bfd_error_handler (_("plugin framework: out of file descriptors. Try using fewer objects/archives\n"));
259 return 0;
260 }
261 #endif
262 }
263 }
264
265 if (iobfd == ibfd)
266 {
267 struct stat stat_buf;
268
269 if (fstat (fd, &stat_buf))
270 {
271 close (fd);
272 return 0;
273 }
274
275 file->offset = 0;
276 file->filesize = stat_buf.st_size;
277 }
278 else
279 {
280 /* Cache the archive plugin file descriptor. */
281 iobfd->archive_plugin_fd = fd;
282 iobfd->archive_plugin_fd_open_count++;
283
284 file->offset = ibfd->origin;
285 file->filesize = arelt_size (ibfd);
286 }
287
288 file->fd = fd;
289 return 1;
290 }
291
292 /* Close the plugin file descriptor FD. If ABFD isn't NULL, it is an
293 archive member. */
294
295 void
bfd_plugin_close_file_descriptor(bfd * abfd,int fd)296 bfd_plugin_close_file_descriptor (bfd *abfd, int fd)
297 {
298 if (abfd == NULL)
299 close (fd);
300 else
301 {
302 while (abfd->my_archive
303 && !bfd_is_thin_archive (abfd->my_archive))
304 abfd = abfd->my_archive;
305
306 /* Close the file descriptor if there is no archive plugin file
307 descriptor. */
308 if (abfd->archive_plugin_fd == -1)
309 {
310 close (fd);
311 return;
312 }
313
314 abfd->archive_plugin_fd_open_count--;
315 /* Dup the archive plugin file descriptor for later use, which
316 will be closed by _bfd_archive_close_and_cleanup. */
317 if (abfd->archive_plugin_fd_open_count == 0)
318 {
319 abfd->archive_plugin_fd = dup (fd);
320 close (fd);
321 }
322 }
323 }
324
325 static int
try_claim(bfd * abfd)326 try_claim (bfd *abfd)
327 {
328 int claimed = 0;
329 struct ld_plugin_input_file file;
330
331 file.handle = abfd;
332 if (bfd_plugin_open_input (abfd, &file)
333 && current_plugin->claim_file)
334 {
335 current_plugin->claim_file (&file, &claimed);
336 bfd_plugin_close_file_descriptor ((abfd->my_archive != NULL
337 ? abfd : NULL),
338 file.fd);
339 }
340
341 return claimed;
342 }
343
344 static bool
try_load_plugin(const char * pname,struct plugin_list_entry * plugin_list_iter,bfd * abfd,bool build_list_p)345 try_load_plugin (const char *pname,
346 struct plugin_list_entry *plugin_list_iter,
347 bfd *abfd,
348 bool build_list_p)
349 {
350 void *plugin_handle;
351 struct ld_plugin_tv tv[6];
352 int i;
353 ld_plugin_onload onload;
354 enum ld_plugin_status status;
355 bool result = false;
356
357 /* NB: Each object is independent. Reuse the previous plugin from
358 the last run will lead to wrong result. */
359 if (current_plugin)
360 memset (current_plugin, 0,
361 offsetof (struct plugin_list_entry, next));
362
363 if (plugin_list_iter)
364 pname = plugin_list_iter->plugin_name;
365
366 plugin_handle = dlopen (pname, RTLD_NOW);
367 if (!plugin_handle)
368 {
369 /* If we are building a list of viable plugins, then
370 we do not bother the user with the details of any
371 plugins that cannot be loaded. */
372 if (! build_list_p)
373 _bfd_error_handler ("Failed to load plugin '%s', reason: %s\n",
374 pname, dlerror ());
375 return false;
376 }
377
378 if (plugin_list_iter == NULL)
379 {
380 size_t length_plugin_name = strlen (pname) + 1;
381 char *plugin_name = bfd_malloc (length_plugin_name);
382
383 if (plugin_name == NULL)
384 goto short_circuit;
385 plugin_list_iter = bfd_malloc (sizeof *plugin_list_iter);
386 if (plugin_list_iter == NULL)
387 {
388 free (plugin_name);
389 goto short_circuit;
390 }
391 /* Make a copy of PNAME since PNAME from load_plugin () will be
392 freed. */
393 memcpy (plugin_name, pname, length_plugin_name);
394 memset (plugin_list_iter, 0, sizeof (*plugin_list_iter));
395 plugin_list_iter->plugin_name = plugin_name;
396 plugin_list_iter->next = plugin_list;
397 plugin_list = plugin_list_iter;
398 }
399
400 current_plugin = plugin_list_iter;
401 if (build_list_p)
402 goto short_circuit;
403
404 onload = dlsym (plugin_handle, "onload");
405 if (!onload)
406 goto short_circuit;
407
408 i = 0;
409 tv[i].tv_tag = LDPT_MESSAGE;
410 tv[i].tv_u.tv_message = message;
411
412 ++i;
413 tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
414 tv[i].tv_u.tv_register_claim_file = register_claim_file;
415
416 ++i;
417 tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK_V2;
418 tv[i].tv_u.tv_register_claim_file_v2 = register_claim_file_v2;
419
420 ++i;
421 tv[i].tv_tag = LDPT_ADD_SYMBOLS;
422 tv[i].tv_u.tv_add_symbols = add_symbols;
423
424 ++i;
425 tv[i].tv_tag = LDPT_ADD_SYMBOLS_V2;
426 tv[i].tv_u.tv_add_symbols = add_symbols_v2;
427
428 ++i;
429 tv[i].tv_tag = LDPT_NULL;
430 tv[i].tv_u.tv_val = 0;
431
432 /* LTO plugin will call handler hooks to set up plugin handlers. */
433 status = (*onload)(tv);
434
435 if (status != LDPS_OK)
436 goto short_circuit;
437
438 abfd->plugin_format = bfd_plugin_no;
439
440 if (!current_plugin->claim_file)
441 goto short_circuit;
442
443 if (!try_claim (abfd))
444 goto short_circuit;
445
446 abfd->plugin_format = bfd_plugin_yes;
447 result = true;
448
449 short_circuit:
450 dlclose (plugin_handle);
451 return result;
452 }
453
454 /* There may be plugin libraries in lib/bfd-plugins. */
455 static int has_plugin_list = -1;
456
457 static bfd_cleanup (*ld_plugin_object_p) (bfd *, bool);
458
459 static const char *plugin_name;
460
461 void
bfd_plugin_set_plugin(const char * p)462 bfd_plugin_set_plugin (const char *p)
463 {
464 plugin_name = p;
465 }
466
467 /* Return TRUE if a plugin library is used. */
468
469 bool
bfd_plugin_specified_p(void)470 bfd_plugin_specified_p (void)
471 {
472 return plugin_list != NULL;
473 }
474
475 /* Return TRUE if ABFD can be claimed by linker LTO plugin. */
476
477 bool
bfd_link_plugin_object_p(bfd * abfd)478 bfd_link_plugin_object_p (bfd *abfd)
479 {
480 if (ld_plugin_object_p)
481 return ld_plugin_object_p (abfd, false) != NULL;
482 return false;
483 }
484
485 extern const bfd_target plugin_vec;
486
487 /* Return TRUE if TARGET is a pointer to plugin_vec. */
488
489 bool
bfd_plugin_target_p(const bfd_target * target)490 bfd_plugin_target_p (const bfd_target *target)
491 {
492 return target == &plugin_vec;
493 }
494
495 /* Register OBJECT_P to be used by bfd_plugin_object_p. */
496
497 void
register_ld_plugin_object_p(bfd_cleanup (* object_p)(bfd *,bool))498 register_ld_plugin_object_p (bfd_cleanup (*object_p) (bfd *, bool))
499 {
500 ld_plugin_object_p = object_p;
501 }
502
503 static void
build_plugin_list(bfd * abfd)504 build_plugin_list (bfd *abfd)
505 {
506 /* The intent was to search ${libdir}/bfd-plugins for plugins, but
507 unfortunately the original implementation wasn't precisely that
508 when configuring binutils using --libdir. Search in the proper
509 path first, then the old one for backwards compatibility. */
510 static const char *path[]
511 = { LIBDIR "/bfd-plugins", BINDIR "/../lib/bfd-plugins" };
512 struct stat last_st;
513 unsigned int i;
514
515 if (has_plugin_list >= 0)
516 return;
517
518 /* Try not to search the same dir twice, by looking at st_dev and
519 st_ino for the dir. If we are on a file system that always sets
520 st_ino to zero or the actual st_ino is zero we might waste some
521 time, but that doesn't matter too much. */
522 last_st.st_dev = 0;
523 last_st.st_ino = 0;
524 for (i = 0; i < sizeof (path) / sizeof (path[0]); i++)
525 {
526 char *plugin_dir = make_relative_prefix (plugin_program_name,
527 BINDIR,
528 path[i]);
529 if (plugin_dir)
530 {
531 struct stat st;
532 DIR *d;
533
534 if (stat (plugin_dir, &st) == 0
535 && S_ISDIR (st.st_mode)
536 && !(last_st.st_dev == st.st_dev
537 && last_st.st_ino == st.st_ino
538 && st.st_ino != 0)
539 && (d = opendir (plugin_dir)) != NULL)
540 {
541 struct dirent *ent;
542
543 last_st.st_dev = st.st_dev;
544 last_st.st_ino = st.st_ino;
545 while ((ent = readdir (d)) != NULL)
546 {
547 char *full_name;
548
549 full_name = concat (plugin_dir, "/", ent->d_name, NULL);
550 if (stat (full_name, &st) == 0 && S_ISREG (st.st_mode))
551 (void) try_load_plugin (full_name, NULL, abfd, true);
552 free (full_name);
553 }
554 closedir (d);
555 }
556 free (plugin_dir);
557 }
558 }
559
560 has_plugin_list = plugin_list != NULL;
561 }
562
563 static bool
load_plugin(bfd * abfd)564 load_plugin (bfd *abfd)
565 {
566 struct plugin_list_entry *plugin_list_iter;
567
568 if (plugin_name)
569 return try_load_plugin (plugin_name, plugin_list, abfd, false);
570
571 if (plugin_program_name == NULL)
572 return false;
573
574 build_plugin_list (abfd);
575
576 for (plugin_list_iter = plugin_list;
577 plugin_list_iter;
578 plugin_list_iter = plugin_list_iter->next)
579 if (try_load_plugin (NULL, plugin_list_iter, abfd, false))
580 return true;
581
582 return false;
583 }
584
585
586 static bfd_cleanup
bfd_plugin_object_p(bfd * abfd)587 bfd_plugin_object_p (bfd *abfd)
588 {
589 if (ld_plugin_object_p)
590 return ld_plugin_object_p (abfd, false);
591
592 if (abfd->plugin_format == bfd_plugin_unknown && !load_plugin (abfd))
593 return NULL;
594
595 return abfd->plugin_format == bfd_plugin_yes ? _bfd_no_cleanup : NULL;
596 }
597
598 /* Copy any private info we understand from the input bfd
599 to the output bfd. */
600
601 static bool
bfd_plugin_bfd_copy_private_bfd_data(bfd * ibfd ATTRIBUTE_UNUSED,bfd * obfd ATTRIBUTE_UNUSED)602 bfd_plugin_bfd_copy_private_bfd_data (bfd *ibfd ATTRIBUTE_UNUSED,
603 bfd *obfd ATTRIBUTE_UNUSED)
604 {
605 BFD_ASSERT (0);
606 return true;
607 }
608
609 /* Copy any private info we understand from the input section
610 to the output section. */
611
612 static bool
bfd_plugin_bfd_copy_private_section_data(bfd * ibfd ATTRIBUTE_UNUSED,asection * isection ATTRIBUTE_UNUSED,bfd * obfd ATTRIBUTE_UNUSED,asection * osection ATTRIBUTE_UNUSED)613 bfd_plugin_bfd_copy_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED,
614 asection *isection ATTRIBUTE_UNUSED,
615 bfd *obfd ATTRIBUTE_UNUSED,
616 asection *osection ATTRIBUTE_UNUSED)
617 {
618 BFD_ASSERT (0);
619 return true;
620 }
621
622 /* Copy any private info we understand from the input symbol
623 to the output symbol. */
624
625 static bool
bfd_plugin_bfd_copy_private_symbol_data(bfd * ibfd ATTRIBUTE_UNUSED,asymbol * isymbol ATTRIBUTE_UNUSED,bfd * obfd ATTRIBUTE_UNUSED,asymbol * osymbol ATTRIBUTE_UNUSED)626 bfd_plugin_bfd_copy_private_symbol_data (bfd *ibfd ATTRIBUTE_UNUSED,
627 asymbol *isymbol ATTRIBUTE_UNUSED,
628 bfd *obfd ATTRIBUTE_UNUSED,
629 asymbol *osymbol ATTRIBUTE_UNUSED)
630 {
631 BFD_ASSERT (0);
632 return true;
633 }
634
635 static bool
bfd_plugin_bfd_print_private_bfd_data(bfd * abfd ATTRIBUTE_UNUSED,void * ptr ATTRIBUTE_UNUSED)636 bfd_plugin_bfd_print_private_bfd_data (bfd *abfd ATTRIBUTE_UNUSED, void *ptr ATTRIBUTE_UNUSED)
637 {
638 BFD_ASSERT (0);
639 return true;
640 }
641
642 static char *
bfd_plugin_core_file_failing_command(bfd * abfd ATTRIBUTE_UNUSED)643 bfd_plugin_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
644 {
645 BFD_ASSERT (0);
646 return NULL;
647 }
648
649 static int
bfd_plugin_core_file_failing_signal(bfd * abfd ATTRIBUTE_UNUSED)650 bfd_plugin_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
651 {
652 BFD_ASSERT (0);
653 return 0;
654 }
655
656 static int
bfd_plugin_core_file_pid(bfd * abfd ATTRIBUTE_UNUSED)657 bfd_plugin_core_file_pid (bfd *abfd ATTRIBUTE_UNUSED)
658 {
659 BFD_ASSERT (0);
660 return 0;
661 }
662
663 static long
bfd_plugin_get_symtab_upper_bound(bfd * abfd)664 bfd_plugin_get_symtab_upper_bound (bfd *abfd)
665 {
666 struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
667 long nsyms = plugin_data->nsyms;
668
669 BFD_ASSERT (nsyms >= 0);
670
671 return ((nsyms + 1) * sizeof (asymbol *));
672 }
673
674 static flagword
convert_flags(const struct ld_plugin_symbol * sym)675 convert_flags (const struct ld_plugin_symbol *sym)
676 {
677 switch (sym->def)
678 {
679 case LDPK_DEF:
680 case LDPK_COMMON:
681 case LDPK_UNDEF:
682 return BSF_GLOBAL;
683
684 case LDPK_WEAKUNDEF:
685 case LDPK_WEAKDEF:
686 return BSF_GLOBAL | BSF_WEAK;
687
688 default:
689 BFD_ASSERT (0);
690 return 0;
691 }
692 }
693
694 static long
bfd_plugin_canonicalize_symtab(bfd * abfd,asymbol ** alocation)695 bfd_plugin_canonicalize_symtab (bfd *abfd,
696 asymbol **alocation)
697 {
698 struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
699 long nsyms = plugin_data->nsyms;
700 const struct ld_plugin_symbol *syms = plugin_data->syms;
701 static asection fake_text_section
702 = BFD_FAKE_SECTION (fake_text_section, NULL, "plug", 0,
703 SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS);
704 static asection fake_data_section
705 = BFD_FAKE_SECTION (fake_data_section, NULL, "plug", 0,
706 SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS);
707 static asection fake_bss_section
708 = BFD_FAKE_SECTION (fake_bss_section, NULL, "plug", 0,
709 SEC_ALLOC);
710 static asection fake_common_section
711 = BFD_FAKE_SECTION (fake_common_section, NULL, "plug", 0, SEC_IS_COMMON);
712 int i;
713
714 for (i = 0; i < nsyms; i++)
715 {
716 asymbol *s = bfd_alloc (abfd, sizeof (asymbol));
717
718 BFD_ASSERT (s);
719 alocation[i] = s;
720
721 s->the_bfd = abfd;
722 s->name = syms[i].name;
723 s->value = 0;
724 s->flags = convert_flags (&syms[i]);
725 switch (syms[i].def)
726 {
727 case LDPK_COMMON:
728 s->section = &fake_common_section;
729 break;
730 case LDPK_UNDEF:
731 case LDPK_WEAKUNDEF:
732 s->section = bfd_und_section_ptr;
733 break;
734 case LDPK_DEF:
735 case LDPK_WEAKDEF:
736 if (current_plugin->has_symbol_type)
737 switch (syms[i].symbol_type)
738 {
739 default:
740 /* FIXME: Should we issue an error here ? */
741 case LDST_UNKNOWN:
742 /* What is the best fake section for LDST_UNKNOWN? */
743 case LDST_FUNCTION:
744 s->section = &fake_text_section;
745 break;
746 case LDST_VARIABLE:
747 if (syms[i].section_kind == LDSSK_BSS)
748 s->section = &fake_bss_section;
749 else
750 s->section = &fake_data_section;
751 break;
752 }
753 else
754 s->section = &fake_text_section;
755 break;
756 default:
757 BFD_ASSERT (0);
758 }
759
760 s->udata.p = (void *) &syms[i];
761 }
762
763 return nsyms;
764 }
765
766 static void
bfd_plugin_print_symbol(bfd * abfd ATTRIBUTE_UNUSED,void * afile ATTRIBUTE_UNUSED,asymbol * symbol ATTRIBUTE_UNUSED,bfd_print_symbol_type how ATTRIBUTE_UNUSED)767 bfd_plugin_print_symbol (bfd *abfd ATTRIBUTE_UNUSED,
768 void *afile ATTRIBUTE_UNUSED,
769 asymbol *symbol ATTRIBUTE_UNUSED,
770 bfd_print_symbol_type how ATTRIBUTE_UNUSED)
771 {
772 BFD_ASSERT (0);
773 }
774
775 static void
bfd_plugin_get_symbol_info(bfd * abfd ATTRIBUTE_UNUSED,asymbol * symbol,symbol_info * ret)776 bfd_plugin_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED,
777 asymbol *symbol,
778 symbol_info *ret)
779 {
780 bfd_symbol_info (symbol, ret);
781 }
782
783 /* Make an empty symbol. */
784
785 static asymbol *
bfd_plugin_make_empty_symbol(bfd * abfd)786 bfd_plugin_make_empty_symbol (bfd *abfd)
787 {
788 asymbol *new_symbol = bfd_zalloc (abfd, sizeof (asymbol));
789 if (new_symbol == NULL)
790 return new_symbol;
791 new_symbol->the_bfd = abfd;
792 return new_symbol;
793 }
794
795 static int
bfd_plugin_sizeof_headers(bfd * a ATTRIBUTE_UNUSED,struct bfd_link_info * info ATTRIBUTE_UNUSED)796 bfd_plugin_sizeof_headers (bfd *a ATTRIBUTE_UNUSED,
797 struct bfd_link_info *info ATTRIBUTE_UNUSED)
798 {
799 BFD_ASSERT (0);
800 return 0;
801 }
802
803 const bfd_target plugin_vec =
804 {
805 "plugin", /* Name. */
806 bfd_target_unknown_flavour,
807 BFD_ENDIAN_LITTLE, /* Target byte order. */
808 BFD_ENDIAN_LITTLE, /* Target headers byte order. */
809 (HAS_RELOC | EXEC_P | /* Object flags. */
810 HAS_LINENO | HAS_DEBUG |
811 HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
812 (SEC_CODE | SEC_DATA | SEC_ROM | SEC_HAS_CONTENTS
813 | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* Section flags. */
814 0, /* symbol_leading_char. */
815 '/', /* ar_pad_char. */
816 15, /* ar_max_namelen. */
817 255, /* match priority. */
818 TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
819
820 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
821 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
822 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
823 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
824 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
825 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
826
827 { /* bfd_check_format. */
828 _bfd_dummy_target,
829 bfd_plugin_object_p,
830 bfd_generic_archive_p,
831 _bfd_dummy_target
832 },
833 { /* bfd_set_format. */
834 _bfd_bool_bfd_false_error,
835 _bfd_bool_bfd_false_error,
836 _bfd_generic_mkarchive,
837 _bfd_bool_bfd_false_error,
838 },
839 { /* bfd_write_contents. */
840 _bfd_bool_bfd_false_error,
841 _bfd_bool_bfd_false_error,
842 _bfd_write_archive_contents,
843 _bfd_bool_bfd_false_error,
844 },
845
846 BFD_JUMP_TABLE_GENERIC (bfd_plugin),
847 BFD_JUMP_TABLE_COPY (bfd_plugin),
848 BFD_JUMP_TABLE_CORE (bfd_plugin),
849 #ifdef USE_64_BIT_ARCHIVE
850 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_64_bit),
851 #else
852 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
853 #endif
854 BFD_JUMP_TABLE_SYMBOLS (bfd_plugin),
855 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
856 BFD_JUMP_TABLE_WRITE (bfd_plugin),
857 BFD_JUMP_TABLE_LINK (bfd_plugin),
858 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
859
860 NULL,
861
862 NULL /* backend_data. */
863 };
864 #endif /* BFD_SUPPORTS_PLUGINS */
865