1 /* Plugin support for BFD.
2 Copyright (C) 2009-2017 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
24 #if BFD_SUPPORTS_PLUGINS
29 #elif defined (HAVE_WINDOWS_H)
32 #error Unknown how to handle dynamic-load-libraries.
35 #include "plugin-api.h"
38 #include "libiberty.h"
41 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
43 #define RTLD_NOW 0 /* Dummy value. */
46 dlopen (const char *file, int mode ATTRIBUTE_UNUSED)
48 return LoadLibrary (file);
52 dlsym (void *handle, const char *name)
54 return GetProcAddress (handle, name);
57 static int ATTRIBUTE_UNUSED
58 dlclose (void *handle)
67 return "Unable to load DLL.";
70 #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */
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_boolean (*) (bfd *, asymbol *)) bfd_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_line _bfd_nosymbols_find_line
87 #define bfd_plugin_find_inliner_info _bfd_nosymbols_find_inliner_info
88 #define bfd_plugin_get_symbol_version_string _bfd_nosymbols_get_symbol_version_string
89 #define bfd_plugin_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
90 #define bfd_plugin_read_minisymbols _bfd_generic_read_minisymbols
91 #define bfd_plugin_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
92 #define bfd_plugin_set_arch_mach bfd_default_set_arch_mach
93 #define bfd_plugin_set_section_contents _bfd_generic_set_section_contents
94 #define bfd_plugin_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
95 #define bfd_plugin_bfd_relax_section bfd_generic_relax_section
96 #define bfd_plugin_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
97 #define bfd_plugin_bfd_link_add_symbols _bfd_generic_link_add_symbols
98 #define bfd_plugin_bfd_link_just_syms _bfd_generic_link_just_syms
99 #define bfd_plugin_bfd_final_link _bfd_generic_final_link
100 #define bfd_plugin_bfd_link_split_section _bfd_generic_link_split_section
101 #define bfd_plugin_bfd_gc_sections bfd_generic_gc_sections
102 #define bfd_plugin_bfd_lookup_section_flags bfd_generic_lookup_section_flags
103 #define bfd_plugin_bfd_merge_sections bfd_generic_merge_sections
104 #define bfd_plugin_bfd_is_group_section bfd_generic_is_group_section
105 #define bfd_plugin_bfd_discard_group bfd_generic_discard_group
106 #define bfd_plugin_section_already_linked _bfd_generic_section_already_linked
107 #define bfd_plugin_bfd_define_common_symbol bfd_generic_define_common_symbol
108 #define bfd_plugin_bfd_copy_link_hash_symbol_type _bfd_generic_copy_link_hash_symbol_type
109 #define bfd_plugin_bfd_link_check_relocs _bfd_generic_link_check_relocs
111 static enum ld_plugin_status
112 message (int level ATTRIBUTE_UNUSED,
113 const char * format, ...)
116 va_start (args, format);
117 printf ("bfd plugin: ");
118 vprintf (format, args);
124 /* Register a claim-file handler. */
125 static ld_plugin_claim_file_handler claim_file;
127 static enum ld_plugin_status
128 register_claim_file (ld_plugin_claim_file_handler handler)
130 claim_file = handler;
134 static enum ld_plugin_status
135 add_symbols (void * handle,
137 const struct ld_plugin_symbol * syms)
140 struct plugin_data_struct *plugin_data =
141 bfd_alloc (abfd, sizeof (plugin_data_struct));
143 plugin_data->nsyms = nsyms;
144 plugin_data->syms = syms;
147 abfd->flags |= HAS_SYMS;
149 abfd->tdata.plugin_data = plugin_data;
153 static const char *plugin_program_name;
156 bfd_plugin_set_program_name (const char *program_name)
158 plugin_program_name = program_name;
162 bfd_plugin_open_input (bfd *ibfd, struct ld_plugin_input_file *file)
167 if (ibfd->my_archive && !bfd_is_thin_archive (ibfd->my_archive))
168 iobfd = ibfd->my_archive;
169 file->name = iobfd->filename;
171 if (!iobfd->iostream && !bfd_open_file (iobfd))
174 file->fd = fileno ((FILE *) iobfd->iostream);
178 struct stat stat_buf;
179 if (fstat (file->fd, &stat_buf))
182 file->filesize = stat_buf.st_size;
186 file->offset = ibfd->origin;
187 file->filesize = arelt_size (ibfd);
193 try_claim (bfd *abfd)
196 struct ld_plugin_input_file file;
198 if (!bfd_plugin_open_input (abfd, &file))
201 off_t cur_offset = lseek (file.fd, 0, SEEK_CUR);
202 claim_file (&file, &claimed);
203 lseek (file.fd, cur_offset, SEEK_SET);
208 try_load_plugin (const char *pname, bfd *abfd, int *has_plugin_p)
211 struct ld_plugin_tv tv[4];
213 ld_plugin_onload onload;
214 enum ld_plugin_status status;
218 plugin_handle = dlopen (pname, RTLD_NOW);
221 _bfd_error_handler ("%s\n", dlerror ());
225 onload = dlsym (plugin_handle, "onload");
230 tv[i].tv_tag = LDPT_MESSAGE;
231 tv[i].tv_u.tv_message = message;
234 tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
235 tv[i].tv_u.tv_register_claim_file = register_claim_file;
238 tv[i].tv_tag = LDPT_ADD_SYMBOLS;
239 tv[i].tv_u.tv_add_symbols = add_symbols;
242 tv[i].tv_tag = LDPT_NULL;
243 tv[i].tv_u.tv_val = 0;
245 status = (*onload)(tv);
247 if (status != LDPS_OK)
252 abfd->plugin_format = bfd_plugin_no;
257 if (!try_claim (abfd))
260 abfd->plugin_format = bfd_plugin_yes;
268 /* There may be plugin libraries in lib/bfd-plugins. */
270 static int has_plugin = -1;
272 static const bfd_target *(*ld_plugin_object_p) (bfd *);
274 static const char *plugin_name;
277 bfd_plugin_set_plugin (const char *p)
280 has_plugin = p != NULL;
283 /* Return TRUE if a plugin library is used. */
286 bfd_plugin_specified_p (void)
288 return has_plugin > 0;
291 /* Return TRUE if ABFD can be claimed by linker LTO plugin. */
294 bfd_link_plugin_object_p (bfd *abfd)
296 if (ld_plugin_object_p)
297 return ld_plugin_object_p (abfd) != NULL;
301 extern const bfd_target plugin_vec;
303 /* Return TRUE if TARGET is a pointer to plugin_vec. */
306 bfd_plugin_target_p (const bfd_target *target)
308 return target == &plugin_vec;
311 /* Register OBJECT_P to be used by bfd_plugin_object_p. */
314 register_ld_plugin_object_p (const bfd_target *(*object_p) (bfd *))
316 ld_plugin_object_p = object_p;
320 load_plugin (bfd *abfd)
332 return try_load_plugin (plugin_name, abfd, &has_plugin);
334 if (plugin_program_name == NULL)
337 plugin_dir = concat (BINDIR, "/../lib/bfd-plugins", NULL);
338 p = make_relative_prefix (plugin_program_name,
348 while ((ent = readdir (d)))
354 full_name = concat (p, "/", ent->d_name, NULL);
355 if (stat(full_name, &s) == 0 && S_ISREG (s.st_mode))
356 found = try_load_plugin (full_name, abfd, &valid_plugin);
358 has_plugin = valid_plugin;
373 static const bfd_target *
374 bfd_plugin_object_p (bfd *abfd)
376 if (ld_plugin_object_p)
377 return ld_plugin_object_p (abfd);
379 if (abfd->plugin_format == bfd_plugin_unknown && !load_plugin (abfd))
382 return abfd->plugin_format == bfd_plugin_yes ? abfd->xvec : NULL;
385 /* Copy any private info we understand from the input bfd
386 to the output bfd. */
389 bfd_plugin_bfd_copy_private_bfd_data (bfd *ibfd ATTRIBUTE_UNUSED,
390 bfd *obfd ATTRIBUTE_UNUSED)
396 /* Copy any private info we understand from the input section
397 to the output section. */
400 bfd_plugin_bfd_copy_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED,
401 asection *isection ATTRIBUTE_UNUSED,
402 bfd *obfd ATTRIBUTE_UNUSED,
403 asection *osection ATTRIBUTE_UNUSED)
409 /* Copy any private info we understand from the input symbol
410 to the output symbol. */
413 bfd_plugin_bfd_copy_private_symbol_data (bfd *ibfd ATTRIBUTE_UNUSED,
414 asymbol *isymbol ATTRIBUTE_UNUSED,
415 bfd *obfd ATTRIBUTE_UNUSED,
416 asymbol *osymbol ATTRIBUTE_UNUSED)
423 bfd_plugin_bfd_print_private_bfd_data (bfd *abfd ATTRIBUTE_UNUSED, PTR ptr ATTRIBUTE_UNUSED)
430 bfd_plugin_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
437 bfd_plugin_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
444 bfd_plugin_core_file_pid (bfd *abfd ATTRIBUTE_UNUSED)
451 bfd_plugin_get_symtab_upper_bound (bfd *abfd)
453 struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
454 long nsyms = plugin_data->nsyms;
456 BFD_ASSERT (nsyms >= 0);
458 return ((nsyms + 1) * sizeof (asymbol *));
462 convert_flags (const struct ld_plugin_symbol *sym)
473 return BSF_GLOBAL | BSF_WEAK;
482 bfd_plugin_canonicalize_symtab (bfd *abfd,
485 struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
486 long nsyms = plugin_data->nsyms;
487 const struct ld_plugin_symbol *syms = plugin_data->syms;
488 static asection fake_section;
489 static asection fake_common_section;
492 fake_section.name = ".text";
493 fake_common_section.flags = SEC_IS_COMMON;
495 for (i = 0; i < nsyms; i++)
497 asymbol *s = bfd_alloc (abfd, sizeof (asymbol));
503 s->name = syms[i].name;
505 s->flags = convert_flags (&syms[i]);
509 s->section = &fake_common_section;
513 s->section = bfd_und_section_ptr;
517 s->section = &fake_section;
523 s->udata.p = (void *) &syms[i];
530 bfd_plugin_print_symbol (bfd *abfd ATTRIBUTE_UNUSED,
531 PTR afile ATTRIBUTE_UNUSED,
532 asymbol *symbol ATTRIBUTE_UNUSED,
533 bfd_print_symbol_type how ATTRIBUTE_UNUSED)
539 bfd_plugin_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED,
543 bfd_symbol_info (symbol, ret);
546 /* Make an empty symbol. */
549 bfd_plugin_make_empty_symbol (bfd *abfd)
551 asymbol *new_symbol = bfd_zalloc (abfd, sizeof (asymbol));
552 if (new_symbol == NULL)
554 new_symbol->the_bfd = abfd;
559 bfd_plugin_sizeof_headers (bfd *a ATTRIBUTE_UNUSED,
560 struct bfd_link_info *info ATTRIBUTE_UNUSED)
566 const bfd_target plugin_vec =
568 "plugin", /* Name. */
569 bfd_target_unknown_flavour,
570 BFD_ENDIAN_LITTLE, /* Target byte order. */
571 BFD_ENDIAN_LITTLE, /* Target headers byte order. */
572 (HAS_RELOC | EXEC_P | /* Object flags. */
573 HAS_LINENO | HAS_DEBUG |
574 HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
575 (SEC_CODE | SEC_DATA | SEC_ROM | SEC_HAS_CONTENTS
576 | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* Section flags. */
577 0, /* symbol_leading_char. */
578 '/', /* ar_pad_char. */
579 15, /* ar_max_namelen. */
580 255, /* match priority. */
582 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
583 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
584 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
585 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
586 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
587 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
589 { /* bfd_check_format. */
592 bfd_generic_archive_p,
595 { /* bfd_set_format. */
598 _bfd_generic_mkarchive,
601 { /* bfd_write_contents. */
604 _bfd_write_archive_contents,
608 BFD_JUMP_TABLE_GENERIC (bfd_plugin),
609 BFD_JUMP_TABLE_COPY (bfd_plugin),
610 BFD_JUMP_TABLE_CORE (bfd_plugin),
611 #ifdef USE_64_BIT_ARCHIVE
612 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_64_bit),
614 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
616 BFD_JUMP_TABLE_SYMBOLS (bfd_plugin),
617 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
618 BFD_JUMP_TABLE_WRITE (bfd_plugin),
619 BFD_JUMP_TABLE_LINK (bfd_plugin),
620 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
624 NULL /* backend_data. */
626 #endif /* BFD_SUPPORTS_PLUGIN */