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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [solib-target.c] - Blame information for rev 853

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1 24 jeremybenn
/* Definitions for targets which report shared library events.
2
 
3
   Copyright (C) 2007, 2008 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,
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   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.
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17
   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
19
 
20
#include "defs.h"
21
#include "objfiles.h"
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#include "solist.h"
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#include "symtab.h"
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#include "symfile.h"
25
#include "target.h"
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#include "vec.h"
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#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
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     so_list; it is only here during XML parsing.  */
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  char *name;
39
 
40
  /* The base addresses for each independently relocatable segment of
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     this shared library.  */
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  VEC(CORE_ADDR) *segment_bases;
43
 
44
  /* The cached offsets for each section of this shared library,
45
     determined from SEGMENT_BASES.  */
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  struct section_offsets *offsets;
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};
48
 
49
typedef struct lm_info *lm_info_p;
50
DEF_VEC_P(lm_info_p);
51
 
52
#if !defined(HAVE_LIBEXPAT)
53
 
54
static VEC(lm_info_p) *
55
solib_target_parse_libraries (const char *library)
56
{
57
  static int have_warned;
58
 
59
  if (!have_warned)
60
    {
61
      have_warned = 1;
62
      warning (_("Can not parse XML library list; XML support was disabled "
63
                 "at compile time"));
64
    }
65
 
66
  return NULL;
67
}
68
 
69
#else /* HAVE_LIBEXPAT */
70
 
71
#include "xml-support.h"
72
 
73
/* Handle the start of a <segment> element.  */
74
 
75
static void
76
library_list_start_segment (struct gdb_xml_parser *parser,
77
                            const struct gdb_xml_element *element,
78
                            void *user_data, VEC(gdb_xml_value_s) *attributes)
79
{
80
  VEC(lm_info_p) **list = user_data;
81
  struct lm_info *last = VEC_last (lm_info_p, *list);
82
  ULONGEST *address_p = VEC_index (gdb_xml_value_s, attributes, 0)->value;
83
  CORE_ADDR address = (CORE_ADDR) *address_p;
84
 
85
  VEC_safe_push (CORE_ADDR, last->segment_bases, &address);
86
}
87
 
88
/* Handle the start of a <library> element.  */
89
 
90
static void
91
library_list_start_library (struct gdb_xml_parser *parser,
92
                            const struct gdb_xml_element *element,
93
                            void *user_data, VEC(gdb_xml_value_s) *attributes)
94
{
95
  VEC(lm_info_p) **list = user_data;
96
  struct lm_info *item = XZALLOC (struct lm_info);
97
  const char *name = VEC_index (gdb_xml_value_s, attributes, 0)->value;
98
 
99
  item->name = xstrdup (name);
100
  VEC_safe_push (lm_info_p, *list, item);
101
}
102
 
103
/* Handle the start of a <library-list> element.  */
104
 
105
static void
106
library_list_start_list (struct gdb_xml_parser *parser,
107
                         const struct gdb_xml_element *element,
108
                         void *user_data, VEC(gdb_xml_value_s) *attributes)
109
{
110
  char *version = VEC_index (gdb_xml_value_s, attributes, 0)->value;
111
 
112
  if (strcmp (version, "1.0") != 0)
113
    gdb_xml_error (parser,
114
                   _("Library list has unsupported version \"%s\""),
115
                   version);
116
}
117
 
118
/* Discard the constructed library list.  */
119
 
120
static void
121
solib_target_free_library_list (void *p)
122
{
123
  VEC(lm_info_p) **result = p;
124
  struct lm_info *info;
125
  int ix;
126
 
127
  for (ix = 0; VEC_iterate (lm_info_p, *result, ix, info); ix++)
128
    {
129
      xfree (info->name);
130
      VEC_free (CORE_ADDR, info->segment_bases);
131
      xfree (info);
132
    }
133
  VEC_free (lm_info_p, *result);
134
  *result = NULL;
135
}
136
 
137
/* The allowed elements and attributes for an XML library list.
138
   The root element is a <library-list>.  */
139
 
140
const struct gdb_xml_attribute segment_attributes[] = {
141
  { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
142
  { NULL, GDB_XML_AF_NONE, NULL, NULL }
143
};
144
 
145
const struct gdb_xml_element library_children[] = {
146
  { "segment", segment_attributes, NULL, GDB_XML_EF_REPEATABLE,
147
    library_list_start_segment, NULL },
148
  { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
149
};
150
 
151
const struct gdb_xml_attribute library_attributes[] = {
152
  { "name", GDB_XML_AF_NONE, NULL, NULL },
153
  { NULL, GDB_XML_AF_NONE, NULL, NULL }
154
};
155
 
156
const struct gdb_xml_element library_list_children[] = {
157
  { "library", library_attributes, library_children,
158
    GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
159
    library_list_start_library, NULL },
160
  { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
161
};
162
 
163
const struct gdb_xml_attribute library_list_attributes[] = {
164
  { "version", GDB_XML_AF_NONE, NULL, NULL },
165
  { NULL, GDB_XML_AF_NONE, NULL, NULL }
166
};
167
 
168
const struct gdb_xml_element library_list_elements[] = {
169
  { "library-list", library_list_attributes, library_list_children,
170
    GDB_XML_EF_NONE, library_list_start_list, NULL },
171
  { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
172
};
173
 
174
static VEC(lm_info_p) *
175
solib_target_parse_libraries (const char *library)
176
{
177
  struct gdb_xml_parser *parser;
178
  VEC(lm_info_p) *result = NULL;
179
  struct cleanup *before_deleting_result, *back_to;
180
 
181
  back_to = make_cleanup (null_cleanup, NULL);
182
  parser = gdb_xml_create_parser_and_cleanup (_("target library list"),
183
                                              library_list_elements, &result);
184
  gdb_xml_use_dtd (parser, "library-list.dtd");
185
 
186
  before_deleting_result = make_cleanup (solib_target_free_library_list,
187
                                         &result);
188
 
189
  if (gdb_xml_parse (parser, library) == 0)
190
    /* Parsed successfully, don't need to delete the result.  */
191
    discard_cleanups (before_deleting_result);
192
 
193
  do_cleanups (back_to);
194
  return result;
195
}
196
#endif
197
 
198
static struct so_list *
199
solib_target_current_sos (void)
200
{
201
  struct so_list *new_solib, *start = NULL, *last = NULL;
202
  const char *library_document;
203
  VEC(lm_info_p) *library_list;
204
  struct lm_info *info;
205
  int ix;
206
 
207
  /* Fetch the list of shared libraries.  */
208
  library_document = target_read_stralloc (&current_target,
209
                                           TARGET_OBJECT_LIBRARIES,
210
                                           NULL);
211
  if (library_document == NULL)
212
    return NULL;
213
 
214
  /* Parse the list.  */
215
  library_list = solib_target_parse_libraries (library_document);
216
  if (library_list == NULL)
217
    return NULL;
218
 
219
  /* Build a struct so_list for each entry on the list.  */
220
  for (ix = 0; VEC_iterate (lm_info_p, library_list, ix, info); ix++)
221
    {
222
      new_solib = XZALLOC (struct so_list);
223
      strncpy (new_solib->so_name, info->name, SO_NAME_MAX_PATH_SIZE - 1);
224
      new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
225
      strncpy (new_solib->so_original_name, info->name,
226
               SO_NAME_MAX_PATH_SIZE - 1);
227
      new_solib->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
228
      new_solib->lm_info = info;
229
 
230
      /* We no longer need this copy of the name.  */
231
      xfree (info->name);
232
      info->name = NULL;
233
 
234
      /* Add it to the list.  */
235
      if (!start)
236
        last = start = new_solib;
237
      else
238
        {
239
          last->next = new_solib;
240
          last = new_solib;
241
        }
242
    }
243
 
244
  /* Free the library list, but not its members.  */
245
  VEC_free (lm_info_p, library_list);
246
 
247
  return start;
248
}
249
 
250
static void
251
solib_target_special_symbol_handling (void)
252
{
253
  /* Nothing needed.  */
254
}
255
 
256
static void
257
solib_target_solib_create_inferior_hook (void)
258
{
259
  /* Nothing needed.  */
260
}
261
 
262
static void
263
solib_target_clear_solib (void)
264
{
265
  /* Nothing needed.  */
266
}
267
 
268
static void
269
solib_target_free_so (struct so_list *so)
270
{
271
  gdb_assert (so->lm_info->name == NULL);
272
  xfree (so->lm_info->offsets);
273
  VEC_free (CORE_ADDR, so->lm_info->segment_bases);
274
  xfree (so->lm_info);
275
}
276
 
277
static void
278
solib_target_relocate_section_addresses (struct so_list *so,
279
                                         struct section_table *sec)
280
{
281
  int flags = bfd_get_section_flags (sec->bfd, sec->the_bfd_section);
282
  CORE_ADDR offset;
283
 
284
  /* Build the offset table only once per object file.  We can not do
285
     it any earlier, since we need to open the file first.  */
286
  if (so->lm_info->offsets == NULL)
287
    {
288
      struct symfile_segment_data *data;
289
      int num_sections = bfd_count_sections (so->abfd);
290
 
291
      so->lm_info->offsets = xzalloc (SIZEOF_N_SECTION_OFFSETS (num_sections));
292
 
293
      data = get_symfile_segment_data (so->abfd);
294
      if (data == NULL)
295
        warning (_("Could not relocate shared library \"%s\": no segments"),
296
                 so->so_name);
297
      else
298
        {
299
          ULONGEST orig_delta;
300
          int i;
301
          int num_bases = VEC_length (CORE_ADDR, so->lm_info->segment_bases);
302
          CORE_ADDR *segment_bases = VEC_address (CORE_ADDR,
303
                                                  so->lm_info->segment_bases);
304
 
305
          if (!symfile_map_offsets_to_segments (so->abfd, data,
306
                                                so->lm_info->offsets,
307
                                                num_bases, segment_bases))
308
            warning (_("Could not relocate shared library \"%s\": bad offsets"),
309
                     so->so_name);
310
 
311
          /* Find the range of addresses to report for this library in
312
             "info sharedlibrary".  Report any consecutive segments
313
             which were relocated as a single unit.  */
314
          gdb_assert (num_bases > 0);
315
          orig_delta = segment_bases[0] - data->segment_bases[0];
316
 
317
          for (i = 1; i < data->num_segments; i++)
318
            {
319
              /* If we have run out of offsets, assume all remaining segments
320
                 have the same offset.  */
321
              if (i >= num_bases)
322
                continue;
323
 
324
              /* If this segment does not have the same offset, do not include
325
                 it in the library's range.  */
326
              if (segment_bases[i] - data->segment_bases[i] != orig_delta)
327
                break;
328
            }
329
 
330
          so->addr_low = segment_bases[0];
331
          so->addr_high = (data->segment_bases[i - 1]
332
                           + data->segment_sizes[i - 1]
333
                           + orig_delta);
334
          gdb_assert (so->addr_low <= so->addr_high);
335
 
336
          free_symfile_segment_data (data);
337
        }
338
    }
339
 
340
  offset = so->lm_info->offsets->offsets[sec->the_bfd_section->index];
341
  sec->addr += offset;
342
  sec->endaddr += offset;
343
}
344
 
345
static int
346
solib_target_open_symbol_file_object (void *from_ttyp)
347
{
348
  /* We can't locate the main symbol file based on the target's
349
     knowledge; the user has to specify it.  */
350
  return 0;
351
}
352
 
353
static int
354
solib_target_in_dynsym_resolve_code (CORE_ADDR pc)
355
{
356
  /* We don't have a range of addresses for the dynamic linker; there
357
     may not be one in the program's address space.  So only report
358
     PLT entries (which may be import stubs).  */
359
  return in_plt_section (pc, NULL);
360
}
361
 
362
struct target_so_ops solib_target_so_ops;
363
 
364
extern initialize_file_ftype _initialize_solib_target; /* -Wmissing-prototypes */
365
 
366
void
367
_initialize_solib_target (void)
368
{
369
  solib_target_so_ops.relocate_section_addresses
370
    = solib_target_relocate_section_addresses;
371
  solib_target_so_ops.free_so = solib_target_free_so;
372
  solib_target_so_ops.clear_solib = solib_target_clear_solib;
373
  solib_target_so_ops.solib_create_inferior_hook
374
    = solib_target_solib_create_inferior_hook;
375
  solib_target_so_ops.special_symbol_handling
376
    = solib_target_special_symbol_handling;
377
  solib_target_so_ops.current_sos = solib_target_current_sos;
378
  solib_target_so_ops.open_symbol_file_object
379
    = solib_target_open_symbol_file_object;
380
  solib_target_so_ops.in_dynsym_resolve_code
381
    = solib_target_in_dynsym_resolve_code;
382
}

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