1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
|
/* Definitions for targets which report shared library events.
Copyright (C) 2007-2019 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "objfiles.h"
#include "solist.h"
#include "symtab.h"
#include "symfile.h"
#include "target.h"
#include "vec.h"
#include "solib-target.h"
#include <vector>
/* Private data for each loaded library. */
struct lm_info_target : public lm_info_base
{
/* The library's name. The name is normally kept in the struct
so_list; it is only here during XML parsing. */
std::string name;
/* The target can either specify segment bases or section bases, not
both. */
/* The base addresses for each independently relocatable segment of
this shared library. */
std::vector<CORE_ADDR> segment_bases;
/* The base addresses for each independently allocatable,
relocatable section of this shared library. */
std::vector<CORE_ADDR> section_bases;
/* The cached offsets for each section of this shared library,
determined from SEGMENT_BASES, or SECTION_BASES. */
section_offsets *offsets = NULL;
};
typedef std::vector<std::unique_ptr<lm_info_target>> lm_info_vector;
#if !defined(HAVE_LIBEXPAT)
static lm_info_vector
solib_target_parse_libraries (const char *library)
{
static int have_warned;
if (!have_warned)
{
have_warned = 1;
warning (_("Can not parse XML library list; XML support was disabled "
"at compile time"));
}
return lm_info_vector ();
}
#else /* HAVE_LIBEXPAT */
#include "xml-support.h"
/* Handle the start of a <segment> element. */
static void
library_list_start_segment (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data,
std::vector<gdb_xml_value> &attributes)
{
lm_info_vector *list = (lm_info_vector *) user_data;
lm_info_target *last = list->back ().get ();
ULONGEST *address_p
= (ULONGEST *) xml_find_attribute (attributes, "address")->value.get ();
CORE_ADDR address = (CORE_ADDR) *address_p;
if (!last->section_bases.empty ())
gdb_xml_error (parser,
_("Library list with both segments and sections"));
last->segment_bases.push_back (address);
}
static void
library_list_start_section (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data,
std::vector<gdb_xml_value> &attributes)
{
lm_info_vector *list = (lm_info_vector *) user_data;
lm_info_target *last = list->back ().get ();
ULONGEST *address_p
= (ULONGEST *) xml_find_attribute (attributes, "address")->value.get ();
CORE_ADDR address = (CORE_ADDR) *address_p;
if (!last->segment_bases.empty ())
gdb_xml_error (parser,
_("Library list with both segments and sections"));
last->section_bases.push_back (address);
}
/* Handle the start of a <library> element. */
static void
library_list_start_library (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data,
std::vector<gdb_xml_value> &attributes)
{
lm_info_vector *list = (lm_info_vector *) user_data;
lm_info_target *item = new lm_info_target;
item->name
= (const char *) xml_find_attribute (attributes, "name")->value.get ();
list->emplace_back (item);
}
static void
library_list_end_library (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data, const char *body_text)
{
lm_info_vector *list = (lm_info_vector *) user_data;
lm_info_target *lm_info = list->back ().get ();
if (lm_info->segment_bases.empty () && lm_info->section_bases.empty ())
gdb_xml_error (parser, _("No segment or section bases defined"));
}
/* Handle the start of a <library-list> element. */
static void
library_list_start_list (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data,
std::vector<gdb_xml_value> &attributes)
{
struct gdb_xml_value *version = xml_find_attribute (attributes, "version");
/* #FIXED attribute may be omitted, Expat returns NULL in such case. */
if (version != NULL)
{
const char *string = (const char *) version->value.get ();
if (strcmp (string, "1.0") != 0)
gdb_xml_error (parser,
_("Library list has unsupported version \"%s\""),
string);
}
}
/* The allowed elements and attributes for an XML library list.
The root element is a <library-list>. */
static const struct gdb_xml_attribute segment_attributes[] = {
{ "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
};
static const struct gdb_xml_attribute section_attributes[] = {
{ "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
};
static const struct gdb_xml_element library_children[] = {
{ "segment", segment_attributes, NULL,
GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
library_list_start_segment, NULL },
{ "section", section_attributes, NULL,
GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
library_list_start_section, NULL },
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};
static const struct gdb_xml_attribute library_attributes[] = {
{ "name", GDB_XML_AF_NONE, NULL, NULL },
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
};
static const struct gdb_xml_element library_list_children[] = {
{ "library", library_attributes, library_children,
GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
library_list_start_library, library_list_end_library },
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};
static const struct gdb_xml_attribute library_list_attributes[] = {
{ "version", GDB_XML_AF_OPTIONAL, NULL, NULL },
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
};
static const struct gdb_xml_element library_list_elements[] = {
{ "library-list", library_list_attributes, library_list_children,
GDB_XML_EF_NONE, library_list_start_list, NULL },
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};
static lm_info_vector
solib_target_parse_libraries (const char *library)
{
lm_info_vector result;
if (gdb_xml_parse_quick (_("target library list"), "library-list.dtd",
library_list_elements, library, &result) == 0)
{
/* Parsed successfully. */
return result;
}
result.clear ();
return result;
}
#endif
static struct so_list *
solib_target_current_sos (void)
{
struct so_list *new_solib, *start = NULL, *last = NULL;
/* Fetch the list of shared libraries. */
gdb::optional<gdb::char_vector> library_document
= target_read_stralloc (current_top_target (), TARGET_OBJECT_LIBRARIES,
NULL);
if (!library_document)
return NULL;
/* Parse the list. */
lm_info_vector library_list
= solib_target_parse_libraries (library_document->data ());
if (library_list.empty ())
return NULL;
/* Build a struct so_list for each entry on the list. */
for (auto &&info : library_list)
{
new_solib = XCNEW (struct so_list);
strncpy (new_solib->so_name, info->name.c_str (),
SO_NAME_MAX_PATH_SIZE - 1);
new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
strncpy (new_solib->so_original_name, info->name.c_str (),
SO_NAME_MAX_PATH_SIZE - 1);
new_solib->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
/* We no longer need this copy of the name. */
info->name.clear ();
new_solib->lm_info = info.release ();
/* Add it to the list. */
if (!start)
last = start = new_solib;
else
{
last->next = new_solib;
last = new_solib;
}
}
return start;
}
static void
solib_target_solib_create_inferior_hook (int from_tty)
{
/* Nothing needed. */
}
static void
solib_target_clear_solib (void)
{
/* Nothing needed. */
}
static void
solib_target_free_so (struct so_list *so)
{
lm_info_target *li = (lm_info_target *) so->lm_info;
gdb_assert (li->name.empty ());
delete li;
}
static void
solib_target_relocate_section_addresses (struct so_list *so,
struct target_section *sec)
{
CORE_ADDR offset;
lm_info_target *li = (lm_info_target *) so->lm_info;
/* Build the offset table only once per object file. We can not do
it any earlier, since we need to open the file first. */
if (li->offsets == NULL)
{
int num_sections = gdb_bfd_count_sections (so->abfd);
li->offsets
= ((struct section_offsets *)
xzalloc (SIZEOF_N_SECTION_OFFSETS (num_sections)));
if (!li->section_bases.empty ())
{
int i;
asection *sect;
int num_alloc_sections = 0;
for (i = 0, sect = so->abfd->sections;
sect != NULL;
i++, sect = sect->next)
if ((bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC))
num_alloc_sections++;
if (num_alloc_sections != li->section_bases.size ())
warning (_("\
Could not relocate shared library \"%s\": wrong number of ALLOC sections"),
so->so_name);
else
{
int bases_index = 0;
int found_range = 0;
so->addr_low = ~(CORE_ADDR) 0;
so->addr_high = 0;
for (i = 0, sect = so->abfd->sections;
sect != NULL;
i++, sect = sect->next)
{
if (!(bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC))
continue;
if (bfd_section_size (so->abfd, sect) > 0)
{
CORE_ADDR low, high;
low = li->section_bases[i];
high = low + bfd_section_size (so->abfd, sect) - 1;
if (low < so->addr_low)
so->addr_low = low;
if (high > so->addr_high)
so->addr_high = high;
gdb_assert (so->addr_low <= so->addr_high);
found_range = 1;
}
li->offsets->offsets[i] = li->section_bases[bases_index];
bases_index++;
}
if (!found_range)
so->addr_low = so->addr_high = 0;
gdb_assert (so->addr_low <= so->addr_high);
}
}
else if (!li->segment_bases.empty ())
{
struct symfile_segment_data *data;
data = get_symfile_segment_data (so->abfd);
if (data == NULL)
warning (_("\
Could not relocate shared library \"%s\": no segments"), so->so_name);
else
{
ULONGEST orig_delta;
int i;
if (!symfile_map_offsets_to_segments (so->abfd, data, li->offsets,
li->segment_bases.size (),
li->segment_bases.data ()))
warning (_("\
Could not relocate shared library \"%s\": bad offsets"), so->so_name);
/* Find the range of addresses to report for this library in
"info sharedlibrary". Report any consecutive segments
which were relocated as a single unit. */
gdb_assert (li->segment_bases.size () > 0);
orig_delta = li->segment_bases[0] - data->segment_bases[0];
for (i = 1; i < data->num_segments; i++)
{
/* If we have run out of offsets, assume all
remaining segments have the same offset. */
if (i >= li->segment_bases.size ())
continue;
/* If this segment does not have the same offset, do
not include it in the library's range. */
if (li->segment_bases[i] - data->segment_bases[i]
!= orig_delta)
break;
}
so->addr_low = li->segment_bases[0];
so->addr_high = (data->segment_bases[i - 1]
+ data->segment_sizes[i - 1]
+ orig_delta);
gdb_assert (so->addr_low <= so->addr_high);
free_symfile_segment_data (data);
}
}
}
offset = li->offsets->offsets[gdb_bfd_section_index
(sec->the_bfd_section->owner,
sec->the_bfd_section)];
sec->addr += offset;
sec->endaddr += offset;
}
static int
solib_target_open_symbol_file_object (int from_tty)
{
/* We can't locate the main symbol file based on the target's
knowledge; the user has to specify it. */
return 0;
}
static int
solib_target_in_dynsym_resolve_code (CORE_ADDR pc)
{
/* We don't have a range of addresses for the dynamic linker; there
may not be one in the program's address space. So only report
PLT entries (which may be import stubs). */
return in_plt_section (pc);
}
struct target_so_ops solib_target_so_ops;
void
_initialize_solib_target (void)
{
solib_target_so_ops.relocate_section_addresses
= solib_target_relocate_section_addresses;
solib_target_so_ops.free_so = solib_target_free_so;
solib_target_so_ops.clear_solib = solib_target_clear_solib;
solib_target_so_ops.solib_create_inferior_hook
= solib_target_solib_create_inferior_hook;
solib_target_so_ops.current_sos = solib_target_current_sos;
solib_target_so_ops.open_symbol_file_object
= solib_target_open_symbol_file_object;
solib_target_so_ops.in_dynsym_resolve_code
= solib_target_in_dynsym_resolve_code;
solib_target_so_ops.bfd_open = solib_bfd_open;
/* Set current_target_so_ops to solib_target_so_ops if not already
set. */
if (current_target_so_ops == 0)
current_target_so_ops = &solib_target_so_ops;
}
|