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[/] [openrisc/] [trunk/] [gnu-stable/] [gdb-7.2/] [gdb/] [solib-target.c] - Blame information for rev 853

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1 330 jeremybenn
/* Definitions for targets which report shared library events.
2
 
3
   Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
4
 
5
   This file is part of GDB.
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, see <http://www.gnu.org/licenses/>.  */
19
 
20
#include "defs.h"
21
#include "objfiles.h"
22
#include "solist.h"
23
#include "symtab.h"
24
#include "symfile.h"
25
#include "target.h"
26
#include "vec.h"
27
#include "solib-target.h"
28
 
29
#include "gdb_string.h"
30
 
31
DEF_VEC_O(CORE_ADDR);
32
 
33
/* Private data for each loaded library.  */
34
struct lm_info
35
{
36
  /* The library's name.  The name is normally kept in the struct
37
     so_list; it is only here during XML parsing.  */
38
  char *name;
39
 
40
  /* The target can either specify segment bases or section bases, not
41
     both.  */
42
 
43
  /* The base addresses for each independently relocatable segment of
44
     this shared library.  */
45
  VEC(CORE_ADDR) *segment_bases;
46
 
47
  /* The base addresses for each independently allocatable,
48
     relocatable section of this shared library.  */
49
  VEC(CORE_ADDR) *section_bases;
50
 
51
  /* The cached offsets for each section of this shared library,
52
     determined from SEGMENT_BASES, or SECTION_BASES.  */
53
  struct section_offsets *offsets;
54
};
55
 
56
typedef struct lm_info *lm_info_p;
57
DEF_VEC_P(lm_info_p);
58
 
59
#if !defined(HAVE_LIBEXPAT)
60
 
61
static VEC(lm_info_p) *
62
solib_target_parse_libraries (const char *library)
63
{
64
  static int have_warned;
65
 
66
  if (!have_warned)
67
    {
68
      have_warned = 1;
69
      warning (_("Can not parse XML library list; XML support was disabled "
70
                 "at compile time"));
71
    }
72
 
73
  return NULL;
74
}
75
 
76
#else /* HAVE_LIBEXPAT */
77
 
78
#include "xml-support.h"
79
 
80
/* Handle the start of a <segment> element.  */
81
 
82
static void
83
library_list_start_segment (struct gdb_xml_parser *parser,
84
                            const struct gdb_xml_element *element,
85
                            void *user_data, VEC(gdb_xml_value_s) *attributes)
86
{
87
  VEC(lm_info_p) **list = user_data;
88
  struct lm_info *last = VEC_last (lm_info_p, *list);
89
  ULONGEST *address_p = VEC_index (gdb_xml_value_s, attributes, 0)->value;
90
  CORE_ADDR address = (CORE_ADDR) *address_p;
91
 
92
  if (last->section_bases != NULL)
93
    gdb_xml_error (parser,
94
                   _("Library list with both segments and sections"));
95
 
96
  VEC_safe_push (CORE_ADDR, last->segment_bases, &address);
97
}
98
 
99
static void
100
library_list_start_section (struct gdb_xml_parser *parser,
101
                            const struct gdb_xml_element *element,
102
                            void *user_data, VEC(gdb_xml_value_s) *attributes)
103
{
104
  VEC(lm_info_p) **list = user_data;
105
  struct lm_info *last = VEC_last (lm_info_p, *list);
106
  ULONGEST *address_p = VEC_index (gdb_xml_value_s, attributes, 0)->value;
107
  CORE_ADDR address = (CORE_ADDR) *address_p;
108
 
109
  if (last->segment_bases != NULL)
110
    gdb_xml_error (parser,
111
                   _("Library list with both segments and sections"));
112
 
113
  VEC_safe_push (CORE_ADDR, last->section_bases, &address);
114
}
115
 
116
/* Handle the start of a <library> element.  */
117
 
118
static void
119
library_list_start_library (struct gdb_xml_parser *parser,
120
                            const struct gdb_xml_element *element,
121
                            void *user_data, VEC(gdb_xml_value_s) *attributes)
122
{
123
  VEC(lm_info_p) **list = user_data;
124
  struct lm_info *item = XZALLOC (struct lm_info);
125
  const char *name = VEC_index (gdb_xml_value_s, attributes, 0)->value;
126
 
127
  item->name = xstrdup (name);
128
  VEC_safe_push (lm_info_p, *list, item);
129
}
130
 
131
static void
132
library_list_end_library (struct gdb_xml_parser *parser,
133
                          const struct gdb_xml_element *element,
134
                          void *user_data, const char *body_text)
135
{
136
  VEC(lm_info_p) **list = user_data;
137
  struct lm_info *lm_info = VEC_last (lm_info_p, *list);
138
 
139
  if (lm_info->segment_bases == NULL
140
      && lm_info->section_bases == NULL)
141
    gdb_xml_error (parser,
142
                   _("No segment or section bases defined"));
143
}
144
 
145
 
146
/* Handle the start of a <library-list> element.  */
147
 
148
static void
149
library_list_start_list (struct gdb_xml_parser *parser,
150
                         const struct gdb_xml_element *element,
151
                         void *user_data, VEC(gdb_xml_value_s) *attributes)
152
{
153
  char *version = VEC_index (gdb_xml_value_s, attributes, 0)->value;
154
 
155
  if (strcmp (version, "1.0") != 0)
156
    gdb_xml_error (parser,
157
                   _("Library list has unsupported version \"%s\""),
158
                   version);
159
}
160
 
161
/* Discard the constructed library list.  */
162
 
163
static void
164
solib_target_free_library_list (void *p)
165
{
166
  VEC(lm_info_p) **result = p;
167
  struct lm_info *info;
168
  int ix;
169
 
170
  for (ix = 0; VEC_iterate (lm_info_p, *result, ix, info); ix++)
171
    {
172
      xfree (info->name);
173
      VEC_free (CORE_ADDR, info->segment_bases);
174
      VEC_free (CORE_ADDR, info->section_bases);
175
      xfree (info);
176
    }
177
  VEC_free (lm_info_p, *result);
178
  *result = NULL;
179
}
180
 
181
/* The allowed elements and attributes for an XML library list.
182
   The root element is a <library-list>.  */
183
 
184
const struct gdb_xml_attribute segment_attributes[] = {
185
  { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
186
  { NULL, GDB_XML_AF_NONE, NULL, NULL }
187
};
188
 
189
const struct gdb_xml_attribute section_attributes[] = {
190
  { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
191
  { NULL, GDB_XML_AF_NONE, NULL, NULL }
192
};
193
 
194
const struct gdb_xml_element library_children[] = {
195
  { "segment", segment_attributes, NULL,
196
    GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
197
    library_list_start_segment, NULL },
198
  { "section", section_attributes, NULL,
199
    GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
200
    library_list_start_section, NULL },
201
  { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
202
};
203
 
204
const struct gdb_xml_attribute library_attributes[] = {
205
  { "name", GDB_XML_AF_NONE, NULL, NULL },
206
  { NULL, GDB_XML_AF_NONE, NULL, NULL }
207
};
208
 
209
const struct gdb_xml_element library_list_children[] = {
210
  { "library", library_attributes, library_children,
211
    GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
212
    library_list_start_library, library_list_end_library },
213
  { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
214
};
215
 
216
const struct gdb_xml_attribute library_list_attributes[] = {
217
  { "version", GDB_XML_AF_NONE, NULL, NULL },
218
  { NULL, GDB_XML_AF_NONE, NULL, NULL }
219
};
220
 
221
const struct gdb_xml_element library_list_elements[] = {
222
  { "library-list", library_list_attributes, library_list_children,
223
    GDB_XML_EF_NONE, library_list_start_list, NULL },
224
  { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
225
};
226
 
227
static VEC(lm_info_p) *
228
solib_target_parse_libraries (const char *library)
229
{
230
  struct gdb_xml_parser *parser;
231
  VEC(lm_info_p) *result = NULL;
232
  struct cleanup *before_deleting_result, *back_to;
233
 
234
  back_to = make_cleanup (null_cleanup, NULL);
235
  parser = gdb_xml_create_parser_and_cleanup (_("target library list"),
236
                                              library_list_elements, &result);
237
  gdb_xml_use_dtd (parser, "library-list.dtd");
238
 
239
  before_deleting_result = make_cleanup (solib_target_free_library_list,
240
                                         &result);
241
 
242
  if (gdb_xml_parse (parser, library) == 0)
243
    /* Parsed successfully, don't need to delete the result.  */
244
    discard_cleanups (before_deleting_result);
245
 
246
  do_cleanups (back_to);
247
  return result;
248
}
249
#endif
250
 
251
static struct so_list *
252
solib_target_current_sos (void)
253
{
254
  struct so_list *new_solib, *start = NULL, *last = NULL;
255
  const char *library_document;
256
  VEC(lm_info_p) *library_list;
257
  struct lm_info *info;
258
  int ix;
259
 
260
  /* Fetch the list of shared libraries.  */
261
  library_document = target_read_stralloc (&current_target,
262
                                           TARGET_OBJECT_LIBRARIES,
263
                                           NULL);
264
  if (library_document == NULL)
265
    return NULL;
266
 
267
  /* Parse the list.  */
268
  library_list = solib_target_parse_libraries (library_document);
269
  if (library_list == NULL)
270
    return NULL;
271
 
272
  /* Build a struct so_list for each entry on the list.  */
273
  for (ix = 0; VEC_iterate (lm_info_p, library_list, ix, info); ix++)
274
    {
275
      new_solib = XZALLOC (struct so_list);
276
      strncpy (new_solib->so_name, info->name, SO_NAME_MAX_PATH_SIZE - 1);
277
      new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
278
      strncpy (new_solib->so_original_name, info->name,
279
               SO_NAME_MAX_PATH_SIZE - 1);
280
      new_solib->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
281
      new_solib->lm_info = info;
282
 
283
      /* We no longer need this copy of the name.  */
284
      xfree (info->name);
285
      info->name = NULL;
286
 
287
      /* Add it to the list.  */
288
      if (!start)
289
        last = start = new_solib;
290
      else
291
        {
292
          last->next = new_solib;
293
          last = new_solib;
294
        }
295
    }
296
 
297
  /* Free the library list, but not its members.  */
298
  VEC_free (lm_info_p, library_list);
299
 
300
  return start;
301
}
302
 
303
static void
304
solib_target_special_symbol_handling (void)
305
{
306
  /* Nothing needed.  */
307
}
308
 
309
static void
310
solib_target_solib_create_inferior_hook (int from_tty)
311
{
312
  /* Nothing needed.  */
313
}
314
 
315
static void
316
solib_target_clear_solib (void)
317
{
318
  /* Nothing needed.  */
319
}
320
 
321
static void
322
solib_target_free_so (struct so_list *so)
323
{
324
  gdb_assert (so->lm_info->name == NULL);
325
  xfree (so->lm_info->offsets);
326
  VEC_free (CORE_ADDR, so->lm_info->segment_bases);
327
  xfree (so->lm_info);
328
}
329
 
330
static void
331
solib_target_relocate_section_addresses (struct so_list *so,
332
                                         struct target_section *sec)
333
{
334
  int flags = bfd_get_section_flags (sec->bfd, sec->the_bfd_section);
335
  CORE_ADDR offset;
336
 
337
  /* Build the offset table only once per object file.  We can not do
338
     it any earlier, since we need to open the file first.  */
339
  if (so->lm_info->offsets == NULL)
340
    {
341
      int num_sections = bfd_count_sections (so->abfd);
342
 
343
      so->lm_info->offsets = xzalloc (SIZEOF_N_SECTION_OFFSETS (num_sections));
344
 
345
      if (so->lm_info->section_bases)
346
        {
347
          int i;
348
          asection *sect;
349
          int num_section_bases
350
            = VEC_length (CORE_ADDR, so->lm_info->section_bases);
351
          int num_alloc_sections = 0;
352
 
353
          for (i = 0, sect = so->abfd->sections;
354
               sect != NULL;
355
               i++, sect = sect->next)
356
            if ((bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC))
357
              num_alloc_sections++;
358
 
359
          if (num_alloc_sections != num_section_bases)
360
            warning (_("\
361
Could not relocate shared library \"%s\": wrong number of ALLOC sections"),
362
                     so->so_name);
363
          else
364
            {
365
              int bases_index = 0;
366
              int found_range = 0;
367
              CORE_ADDR *section_bases;
368
 
369
              section_bases = VEC_address (CORE_ADDR,
370
                                           so->lm_info->section_bases);
371
 
372
              so->addr_low = ~(CORE_ADDR) 0;
373
              so->addr_high = 0;
374
              for (i = 0, sect = so->abfd->sections;
375
                   sect != NULL;
376
                   i++, sect = sect->next)
377
                {
378
                  if (!(bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC))
379
                    continue;
380
                  if (bfd_section_size (so->abfd, sect) > 0)
381
                    {
382
                      CORE_ADDR low, high;
383
 
384
                      low = section_bases[i];
385
                      high = low + bfd_section_size (so->abfd, sect) - 1;
386
 
387
                      if (low < so->addr_low)
388
                        so->addr_low = low;
389
                      if (high > so->addr_high)
390
                        so->addr_high = high;
391
                      gdb_assert (so->addr_low <= so->addr_high);
392
                      found_range = 1;
393
                    }
394
                  so->lm_info->offsets->offsets[i] = section_bases[bases_index];
395
                  bases_index++;
396
                }
397
              if (!found_range)
398
                so->addr_low = so->addr_high = 0;
399
              gdb_assert (so->addr_low <= so->addr_high);
400
            }
401
        }
402
      else if (so->lm_info->segment_bases)
403
        {
404
          struct symfile_segment_data *data;
405
 
406
          data = get_symfile_segment_data (so->abfd);
407
          if (data == NULL)
408
            warning (_("\
409
Could not relocate shared library \"%s\": no segments"), so->so_name);
410
          else
411
            {
412
              ULONGEST orig_delta;
413
              int i;
414
              int num_bases;
415
              CORE_ADDR *segment_bases;
416
 
417
              num_bases = VEC_length (CORE_ADDR, so->lm_info->segment_bases);
418
              segment_bases = VEC_address (CORE_ADDR,
419
                                           so->lm_info->segment_bases);
420
 
421
              if (!symfile_map_offsets_to_segments (so->abfd, data,
422
                                                    so->lm_info->offsets,
423
                                                    num_bases, segment_bases))
424
                warning (_("\
425
Could not relocate shared library \"%s\": bad offsets"), so->so_name);
426
 
427
              /* Find the range of addresses to report for this library in
428
                 "info sharedlibrary".  Report any consecutive segments
429
                 which were relocated as a single unit.  */
430
              gdb_assert (num_bases > 0);
431
              orig_delta = segment_bases[0] - data->segment_bases[0];
432
 
433
              for (i = 1; i < data->num_segments; i++)
434
                {
435
                  /* If we have run out of offsets, assume all
436
                     remaining segments have the same offset.  */
437
                  if (i >= num_bases)
438
                    continue;
439
 
440
                  /* If this segment does not have the same offset, do
441
                     not include it in the library's range.  */
442
                  if (segment_bases[i] - data->segment_bases[i] != orig_delta)
443
                    break;
444
                }
445
 
446
              so->addr_low = segment_bases[0];
447
              so->addr_high = (data->segment_bases[i - 1]
448
                               + data->segment_sizes[i - 1]
449
                               + orig_delta);
450
              gdb_assert (so->addr_low <= so->addr_high);
451
 
452
              free_symfile_segment_data (data);
453
            }
454
        }
455
    }
456
 
457
  offset = so->lm_info->offsets->offsets[sec->the_bfd_section->index];
458
  sec->addr += offset;
459
  sec->endaddr += offset;
460
}
461
 
462
static int
463
solib_target_open_symbol_file_object (void *from_ttyp)
464
{
465
  /* We can't locate the main symbol file based on the target's
466
     knowledge; the user has to specify it.  */
467
  return 0;
468
}
469
 
470
static int
471
solib_target_in_dynsym_resolve_code (CORE_ADDR pc)
472
{
473
  /* We don't have a range of addresses for the dynamic linker; there
474
     may not be one in the program's address space.  So only report
475
     PLT entries (which may be import stubs).  */
476
  return in_plt_section (pc, NULL);
477
}
478
 
479
struct target_so_ops solib_target_so_ops;
480
 
481
extern initialize_file_ftype _initialize_solib_target; /* -Wmissing-prototypes */
482
 
483
void
484
_initialize_solib_target (void)
485
{
486
  solib_target_so_ops.relocate_section_addresses
487
    = solib_target_relocate_section_addresses;
488
  solib_target_so_ops.free_so = solib_target_free_so;
489
  solib_target_so_ops.clear_solib = solib_target_clear_solib;
490
  solib_target_so_ops.solib_create_inferior_hook
491
    = solib_target_solib_create_inferior_hook;
492
  solib_target_so_ops.special_symbol_handling
493
    = solib_target_special_symbol_handling;
494
  solib_target_so_ops.current_sos = solib_target_current_sos;
495
  solib_target_so_ops.open_symbol_file_object
496
    = solib_target_open_symbol_file_object;
497
  solib_target_so_ops.in_dynsym_resolve_code
498
    = solib_target_in_dynsym_resolve_code;
499
  solib_target_so_ops.bfd_open = solib_bfd_open;
500
 
501
  /* Set current_target_so_ops to solib_target_so_ops if not already
502
     set.  */
503
  if (current_target_so_ops == 0)
504
    current_target_so_ops = &solib_target_so_ops;
505
}

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