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Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [bfd/] [plugin.c] - Blame information for rev 227

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1 227 jeremybenn
/* Plugin support for BFD.
2
   Copyright 2009
3
   Free Software Foundation, Inc.
4
 
5
   This file is part of BFD, the Binary File Descriptor library.
6
 
7
   This program is free software; you can redistribute it and/or modify
8
   it under the terms of the GNU General Public License as published by
9
   the Free Software Foundation; either version 3 of the License, or
10
   (at your option) any later version.
11
 
12
   This program is distributed in the hope that it will be useful,
13
   but WITHOUT ANY WARRANTY; without even the implied warranty of
14
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
   GNU General Public License for more details.
16
 
17
   You should have received a copy of the GNU General Public License
18
   along with this program; if not, write to the Free Software
19
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20
   MA 02110-1301, USA.  */
21
 
22
#include "config.h"
23
#include "bfd.h"
24
 
25
#if BFD_SUPPORTS_PLUGINS
26
 
27
#include <assert.h>
28
#include <dlfcn.h>
29
#include <stdarg.h>
30
#include "plugin-api.h"
31
#include "sysdep.h"
32
#include "plugin.h"
33
#include "libbfd.h"
34
#include "libiberty.h"
35
#include <dirent.h>
36
 
37
#define bfd_plugin_close_and_cleanup                  _bfd_generic_close_and_cleanup
38
#define bfd_plugin_bfd_free_cached_info               _bfd_generic_bfd_free_cached_info
39
#define bfd_plugin_new_section_hook                   _bfd_generic_new_section_hook
40
#define bfd_plugin_get_section_contents               _bfd_generic_get_section_contents
41
#define bfd_plugin_get_section_contents_in_window     _bfd_generic_get_section_contents_in_window
42
#define bfd_plugin_bfd_copy_private_header_data       _bfd_generic_bfd_copy_private_header_data
43
#define bfd_plugin_bfd_merge_private_bfd_data         _bfd_generic_bfd_merge_private_bfd_data
44
#define bfd_plugin_bfd_copy_private_header_data       _bfd_generic_bfd_copy_private_header_data
45
#define bfd_plugin_bfd_set_private_flags              _bfd_generic_bfd_set_private_flags
46
#define bfd_plugin_core_file_matches_executable_p     generic_core_file_matches_executable_p
47
#define bfd_plugin_bfd_is_local_label_name            _bfd_nosymbols_bfd_is_local_label_name
48
#define bfd_plugin_bfd_is_target_special_symbol       ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
49
#define bfd_plugin_get_lineno                         _bfd_nosymbols_get_lineno
50
#define bfd_plugin_find_nearest_line                  _bfd_nosymbols_find_nearest_line
51
#define bfd_plugin_find_inliner_info                  _bfd_nosymbols_find_inliner_info
52
#define bfd_plugin_bfd_make_debug_symbol              _bfd_nosymbols_bfd_make_debug_symbol
53
#define bfd_plugin_read_minisymbols                   _bfd_generic_read_minisymbols
54
#define bfd_plugin_minisymbol_to_symbol               _bfd_generic_minisymbol_to_symbol
55
#define bfd_plugin_set_arch_mach                      bfd_default_set_arch_mach
56
#define bfd_plugin_set_section_contents               _bfd_generic_set_section_contents
57
#define bfd_plugin_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
58
#define bfd_plugin_bfd_relax_section                  bfd_generic_relax_section
59
#define bfd_plugin_bfd_link_hash_table_create         _bfd_generic_link_hash_table_create
60
#define bfd_plugin_bfd_link_hash_table_free           _bfd_generic_link_hash_table_free
61
#define bfd_plugin_bfd_link_add_symbols               _bfd_generic_link_add_symbols
62
#define bfd_plugin_bfd_link_just_syms                 _bfd_generic_link_just_syms
63
#define bfd_plugin_bfd_final_link                     _bfd_generic_final_link
64
#define bfd_plugin_bfd_link_split_section             _bfd_generic_link_split_section
65
#define bfd_plugin_bfd_gc_sections                    bfd_generic_gc_sections
66
#define bfd_plugin_bfd_merge_sections                 bfd_generic_merge_sections
67
#define bfd_plugin_bfd_is_group_section               bfd_generic_is_group_section
68
#define bfd_plugin_bfd_discard_group                  bfd_generic_discard_group
69
#define bfd_plugin_section_already_linked             _bfd_generic_section_already_linked
70
#define bfd_plugin_bfd_define_common_symbol           bfd_generic_define_common_symbol
71
#define bfd_plugin_bfd_copy_link_hash_symbol_type     _bfd_generic_copy_link_hash_symbol_type
72
 
73
static enum ld_plugin_status
74
message (int level ATTRIBUTE_UNUSED,
75
         const char * format, ...)
76
{
77
  va_list args;
78
  va_start (args, format);
79
  printf ("bfd plugin: ");
80
  vprintf (format, args);
81
  va_end (args);
82
  return LDPS_OK;
83
}
84
 
85
/* Register a claim-file handler. */
86
static ld_plugin_claim_file_handler claim_file;
87
 
88
static enum ld_plugin_status
89
register_claim_file (ld_plugin_claim_file_handler handler)
90
{
91
  claim_file = handler;
92
  return LDPS_OK;
93
}
94
 
95
static enum ld_plugin_status
96
add_symbols (void * handle,
97
             int nsyms,
98
             const struct ld_plugin_symbol * syms)
99
{
100
  bfd *abfd = handle;
101
  struct plugin_data_struct *plugin_data =
102
    bfd_alloc (abfd, sizeof (plugin_data_struct));;
103
 
104
  plugin_data->nsyms = nsyms;
105
  plugin_data->syms = syms;
106
 
107
  if (nsyms != 0)
108
    abfd->flags |= HAS_SYMS;
109
 
110
  abfd->tdata.plugin_data = plugin_data;
111
  return LDPS_OK;
112
}
113
 
114
static const char *plugin_program_name;
115
 
116
void
117
bfd_plugin_set_program_name (const char *program_name)
118
{
119
  plugin_program_name = program_name;
120
}
121
 
122
static int
123
try_load_plugin (const char *pname)
124
{
125
  static void *plugin_handle;
126
  int tv_size = 4;
127
  struct ld_plugin_tv tv[tv_size];
128
  int i;
129
  ld_plugin_onload onload;
130
  enum ld_plugin_status status;
131
 
132
  plugin_handle = dlopen (pname, RTLD_NOW);
133
  if (!plugin_handle)
134
    {
135
      (*_bfd_error_handler)("%s\n", dlerror ());
136
      return 0;
137
    }
138
 
139
  onload = dlsym (plugin_handle, "onload");
140
  if (!onload)
141
    goto err;
142
 
143
  i = 0;
144
  tv[i].tv_tag = LDPT_MESSAGE;
145
  tv[i].tv_u.tv_message = message;
146
 
147
  ++i;
148
  tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK;
149
  tv[i].tv_u.tv_register_claim_file = register_claim_file;
150
 
151
  ++i;
152
  tv[i].tv_tag = LDPT_ADD_SYMBOLS;
153
  tv[i].tv_u.tv_add_symbols = add_symbols;
154
 
155
  ++i;
156
  tv[i].tv_tag = LDPT_NULL;
157
  tv[i].tv_u.tv_val = 0;
158
 
159
  status = (*onload)(tv);
160
 
161
  if (status != LDPS_OK)
162
    goto err;
163
 
164
  if (!claim_file)
165
    goto err;
166
 
167
  return 1;
168
 
169
 err:
170
  plugin_handle = NULL;
171
  return 0;
172
}
173
 
174
static const char *plugin_name;
175
 
176
void
177
bfd_plugin_set_plugin (const char *p)
178
{
179
  plugin_name = p;
180
}
181
 
182
static int
183
load_plugin (void)
184
{
185
  char *plugin_dir;
186
  char *p;
187
  DIR *d;
188
  struct dirent *ent;
189
  int found = 0;
190
 
191
  if (plugin_name)
192
    return try_load_plugin (plugin_name);
193
 
194
  if (plugin_program_name == NULL)
195
    return 0;
196
 
197
  plugin_dir = concat (BINDIR, "/../lib/bfd-plugins", NULL);
198
  p = make_relative_prefix (plugin_program_name,
199
                            BINDIR,
200
                            plugin_dir);
201
  free (plugin_dir);
202
  plugin_dir = NULL;
203
 
204
  d = opendir (p);
205
  if (!d)
206
    goto out;
207
 
208
  while ((ent = readdir (d)))
209
    {
210
      char *full_name;
211
      struct stat s;
212
 
213
      full_name = concat (p, "/", ent->d_name, NULL);
214
      if (stat(full_name, &s) == 0 && S_ISREG (s.st_mode))
215
        found = try_load_plugin (full_name);
216
      free (full_name);
217
      if (found)
218
        break;
219
    }
220
 
221
 out:
222
  free (p);
223
  if (d)
224
    closedir (d);
225
 
226
  return found;
227
}
228
 
229
 
230
static const bfd_target *
231
bfd_plugin_object_p (bfd *abfd)
232
{
233
  int claimed = 0;
234
  int t = load_plugin ();
235
  struct ld_plugin_input_file file;
236
  if (!t)
237
    return NULL;
238
 
239
  file.name = abfd->filename;
240
 
241
  if (abfd->iostream)
242
    {
243
      file.fd = fileno (abfd->iostream);
244
      file.offset = 0;
245
      file.filesize = 0; /*FIXME*/
246
    }
247
  else
248
    {
249
      bfd *archive = abfd->my_archive;
250
      BFD_ASSERT (archive);
251
      file.fd = fileno (archive->iostream);
252
      file.offset = abfd->origin;
253
      file.filesize = arelt_size (abfd);
254
 
255
    }
256
  file.handle = abfd;
257
  claim_file (&file, &claimed);
258
  if (!claimed)
259
    return NULL;
260
 
261
  return abfd->xvec;
262
}
263
 
264
/* Copy any private info we understand from the input bfd
265
   to the output bfd.  */
266
 
267
static bfd_boolean
268
bfd_plugin_bfd_copy_private_bfd_data (bfd *ibfd ATTRIBUTE_UNUSED,
269
                                      bfd *obfd ATTRIBUTE_UNUSED)
270
{
271
  BFD_ASSERT (0);
272
  return TRUE;
273
}
274
 
275
/* Copy any private info we understand from the input section
276
   to the output section.  */
277
 
278
static bfd_boolean
279
bfd_plugin_bfd_copy_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED,
280
                                          asection *isection ATTRIBUTE_UNUSED,
281
                                          bfd *obfd ATTRIBUTE_UNUSED,
282
                                          asection *osection ATTRIBUTE_UNUSED)
283
{
284
  BFD_ASSERT (0);
285
  return TRUE;
286
}
287
 
288
/* Copy any private info we understand from the input symbol
289
   to the output symbol.  */
290
 
291
static bfd_boolean
292
bfd_plugin_bfd_copy_private_symbol_data (bfd *ibfd ATTRIBUTE_UNUSED,
293
                                         asymbol *isymbol ATTRIBUTE_UNUSED,
294
                                         bfd *obfd ATTRIBUTE_UNUSED,
295
                                         asymbol *osymbol ATTRIBUTE_UNUSED)
296
{
297
  BFD_ASSERT (0);
298
  return TRUE;
299
}
300
 
301
static bfd_boolean
302
bfd_plugin_bfd_print_private_bfd_data (bfd *abfd ATTRIBUTE_UNUSED, PTR ptr ATTRIBUTE_UNUSED)
303
{
304
  BFD_ASSERT (0);
305
  return TRUE;
306
}
307
 
308
static char *
309
bfd_plugin_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED)
310
{
311
  BFD_ASSERT (0);
312
  return NULL;
313
}
314
 
315
static int
316
bfd_plugin_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
317
{
318
  BFD_ASSERT (0);
319
  return 0;
320
}
321
 
322
static long
323
bfd_plugin_get_symtab_upper_bound (bfd *abfd)
324
{
325
  struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
326
  long nsyms = plugin_data->nsyms;
327
 
328
  BFD_ASSERT (nsyms >= 0);
329
 
330
  return ((nsyms + 1) * sizeof (asymbol *));
331
}
332
 
333
static flagword
334
convert_flags (const struct ld_plugin_symbol *sym)
335
{
336
 switch (sym->def)
337
   {
338
   case LDPK_DEF:
339
   case LDPK_COMMON:
340
   case LDPK_UNDEF:
341
     return BSF_GLOBAL;
342
 
343
   case LDPK_WEAKUNDEF:
344
   case LDPK_WEAKDEF:
345
     return BSF_GLOBAL | BSF_WEAK;
346
 
347
   default:
348
     BFD_ASSERT (0);
349
     return 0;
350
   }
351
}
352
 
353
static long
354
bfd_plugin_canonicalize_symtab (bfd *abfd,
355
                                asymbol **alocation)
356
{
357
  struct plugin_data_struct *plugin_data = abfd->tdata.plugin_data;
358
  long nsyms = plugin_data->nsyms;
359
  const struct ld_plugin_symbol *syms = plugin_data->syms;
360
  static asection fake_section;
361
  static asection fake_common_section;
362
  int i;
363
 
364
  fake_section.name = ".text";
365
  fake_common_section.flags = SEC_IS_COMMON;
366
 
367
  for (i = 0; i < nsyms; i++)
368
    {
369
      asymbol *s = bfd_alloc (abfd, sizeof (asymbol));
370
 
371
      BFD_ASSERT (s);
372
      alocation[i] = s;
373
 
374
      s->the_bfd = abfd;
375
      s->name = syms[i].name;
376
      s->value = 0;
377
      s->flags = convert_flags (&syms[i]);
378
      switch (syms[i].def)
379
        {
380
        case LDPK_COMMON:
381
          s->section = &fake_common_section;
382
          break;
383
        case LDPK_UNDEF:
384
        case LDPK_WEAKUNDEF:
385
          s->section = bfd_und_section_ptr;
386
          break;
387
        case LDPK_DEF:
388
        case LDPK_WEAKDEF:
389
          s->section = &fake_section;
390
          break;
391
        default:
392
          BFD_ASSERT (0);
393
        }
394
 
395
      s->udata.p = (void *) &syms[i];
396
    }
397
 
398
  return nsyms;
399
}
400
 
401
static void
402
bfd_plugin_print_symbol (bfd *abfd ATTRIBUTE_UNUSED,
403
                         PTR afile ATTRIBUTE_UNUSED,
404
                         asymbol *symbol ATTRIBUTE_UNUSED,
405
                         bfd_print_symbol_type how ATTRIBUTE_UNUSED)
406
{
407
  BFD_ASSERT (0);
408
}
409
 
410
static void
411
bfd_plugin_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED,
412
                            asymbol *symbol,
413
                            symbol_info *ret)
414
{
415
  bfd_symbol_info (symbol, ret);
416
}
417
 
418
/* Make an empty symbol. */
419
 
420
static asymbol *
421
bfd_plugin_make_empty_symbol (bfd *abfd)
422
{
423
  asymbol *new_symbol = bfd_zalloc (abfd, sizeof (asymbol));
424
  if (new_symbol == NULL)
425
    return new_symbol;
426
  new_symbol->the_bfd = abfd;
427
  return new_symbol;
428
}
429
 
430
static int
431
bfd_plugin_sizeof_headers (bfd *a ATTRIBUTE_UNUSED,
432
                           struct bfd_link_info *info ATTRIBUTE_UNUSED)
433
{
434
  BFD_ASSERT (0);
435
  return 0;
436
}
437
 
438
static bfd_boolean
439
bfd_plugin_mkobject (bfd *abfd ATTRIBUTE_UNUSED)
440
{
441
  BFD_ASSERT (0);
442
  return 0;
443
}
444
 
445
const bfd_target plugin_vec =
446
{
447
  "plugin",                     /* Name.  */
448
  bfd_target_unknown_flavour,
449
  BFD_ENDIAN_LITTLE,            /* Target byte order.  */
450
  BFD_ENDIAN_LITTLE,            /* Target headers byte order.  */
451
  (HAS_RELOC | EXEC_P |         /* Object flags.  */
452
   HAS_LINENO | HAS_DEBUG |
453
   HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
454
  (SEC_CODE | SEC_DATA | SEC_ROM | SEC_HAS_CONTENTS
455
   | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* Section flags.  */
456
  0,                             /* symbol_leading_char.  */
457
  '/',                          /* ar_pad_char.  */
458
  15,                           /* ar_max_namelen.  */
459
 
460
  bfd_getl64, bfd_getl_signed_64, bfd_putl64,
461
  bfd_getl32, bfd_getl_signed_32, bfd_putl32,
462
  bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* data */
463
  bfd_getl64, bfd_getl_signed_64, bfd_putl64,
464
  bfd_getl32, bfd_getl_signed_32, bfd_putl32,
465
  bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* hdrs */
466
 
467
  {                             /* bfd_check_format.  */
468
    _bfd_dummy_target,
469
    bfd_plugin_object_p,
470
    bfd_generic_archive_p,
471
    _bfd_dummy_target
472
  },
473
  {                             /* bfd_set_format.  */
474
    bfd_false,
475
    bfd_plugin_mkobject,
476
    _bfd_generic_mkarchive,
477
    bfd_false,
478
  },
479
  {                             /* bfd_write_contents.  */
480
    bfd_false,
481
    bfd_false,
482
    _bfd_write_archive_contents,
483
    bfd_false,
484
  },
485
 
486
  BFD_JUMP_TABLE_GENERIC (bfd_plugin),
487
  BFD_JUMP_TABLE_COPY (bfd_plugin),
488
  BFD_JUMP_TABLE_CORE (bfd_plugin),
489
  BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
490
  BFD_JUMP_TABLE_SYMBOLS (bfd_plugin),
491
  BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
492
  BFD_JUMP_TABLE_WRITE (bfd_plugin),
493
  BFD_JUMP_TABLE_LINK (bfd_plugin),
494
  BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
495
 
496
  NULL,
497
 
498
  NULL                          /* backend_data.  */
499
};
500
#endif /* BFD_SUPPORTS_PLUGIN */

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