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cfa9d6d9 DJ |
1 | /* Definitions for targets which report shared library events. |
2 | ||
3 | Copyright (C) 2007 | |
4 | Free Software Foundation, Inc. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
21 | Boston, MA 02110-1301, USA. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "objfiles.h" | |
25 | #include "solist.h" | |
26 | #include "symtab.h" | |
27 | #include "symfile.h" | |
28 | #include "target.h" | |
29 | #include "vec.h" | |
30 | ||
31 | #include "gdb_string.h" | |
32 | ||
33 | DEF_VEC_O(CORE_ADDR); | |
34 | ||
35 | /* Private data for each loaded library. */ | |
36 | struct lm_info | |
37 | { | |
38 | /* The library's name. The name is normally kept in the struct | |
39 | so_list; it is only here during XML parsing. */ | |
40 | char *name; | |
41 | ||
42 | /* The base addresses for each independently relocatable segment of | |
43 | this shared library. */ | |
44 | VEC(CORE_ADDR) *segment_bases; | |
45 | ||
46 | /* The cached offsets for each section of this shared library, | |
47 | determined from SEGMENT_BASES. */ | |
48 | struct section_offsets *offsets; | |
49 | }; | |
50 | ||
51 | typedef struct lm_info *lm_info_p; | |
52 | DEF_VEC_P(lm_info_p); | |
53 | ||
54 | #if !defined(HAVE_LIBEXPAT) | |
55 | ||
56 | static VEC(lm_info_p) | |
57 | solib_target_parse_libraries (const char *library) | |
58 | { | |
59 | static int have_warned; | |
60 | ||
61 | if (!have_warned) | |
62 | { | |
63 | have_warned = 1; | |
64 | warning (_("Can not parse XML library list; XML support was disabled " | |
65 | "at compile time")); | |
66 | } | |
67 | ||
68 | return NULL; | |
69 | } | |
70 | ||
71 | #else /* HAVE_LIBEXPAT */ | |
72 | ||
73 | #include "xml-support.h" | |
74 | ||
75 | /* Handle the start of a <segment> element. */ | |
76 | ||
77 | static void | |
78 | library_list_start_segment (struct gdb_xml_parser *parser, | |
79 | const struct gdb_xml_element *element, | |
80 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
81 | { | |
82 | VEC(lm_info_p) **list = user_data; | |
83 | struct lm_info *last = VEC_last (lm_info_p, *list); | |
84 | ULONGEST *address_p = VEC_index (gdb_xml_value_s, attributes, 0)->value; | |
358eb95e | 85 | CORE_ADDR address = (CORE_ADDR) *address_p; |
cfa9d6d9 | 86 | |
358eb95e | 87 | VEC_safe_push (CORE_ADDR, last->segment_bases, &address); |
cfa9d6d9 DJ |
88 | } |
89 | ||
90 | /* Handle the start of a <library> element. */ | |
91 | ||
92 | static void | |
93 | library_list_start_library (struct gdb_xml_parser *parser, | |
94 | const struct gdb_xml_element *element, | |
95 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
96 | { | |
97 | VEC(lm_info_p) **list = user_data; | |
98 | struct lm_info *item = XZALLOC (struct lm_info); | |
99 | const char *name = VEC_index (gdb_xml_value_s, attributes, 0)->value; | |
100 | ||
101 | item->name = xstrdup (name); | |
102 | VEC_safe_push (lm_info_p, *list, item); | |
103 | } | |
104 | ||
105 | /* Handle the start of a <library-list> element. */ | |
106 | ||
107 | static void | |
108 | library_list_start_list (struct gdb_xml_parser *parser, | |
109 | const struct gdb_xml_element *element, | |
110 | void *user_data, VEC(gdb_xml_value_s) *attributes) | |
111 | { | |
112 | char *version = VEC_index (gdb_xml_value_s, attributes, 0)->value; | |
113 | ||
114 | if (strcmp (version, "1.0") != 0) | |
115 | gdb_xml_error (parser, | |
116 | _("Library list has unsupported version \"%s\""), | |
117 | version); | |
118 | } | |
119 | ||
120 | /* Discard the constructed library list. */ | |
121 | ||
122 | static void | |
123 | solib_target_free_library_list (void *p) | |
124 | { | |
125 | VEC(lm_info_p) **result = p; | |
126 | struct lm_info *info; | |
127 | int ix; | |
128 | ||
129 | for (ix = 0; VEC_iterate (lm_info_p, *result, ix, info); ix++) | |
130 | { | |
131 | xfree (info->name); | |
132 | VEC_free (CORE_ADDR, info->segment_bases); | |
133 | xfree (info); | |
134 | } | |
135 | VEC_free (lm_info_p, *result); | |
136 | *result = NULL; | |
137 | } | |
138 | ||
139 | /* The allowed elements and attributes for an XML library list. | |
140 | The root element is a <library-list>. */ | |
141 | ||
142 | const struct gdb_xml_attribute segment_attributes[] = { | |
143 | { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, | |
144 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
145 | }; | |
146 | ||
147 | const struct gdb_xml_element library_children[] = { | |
148 | { "segment", segment_attributes, NULL, GDB_XML_EF_REPEATABLE, | |
149 | library_list_start_segment, NULL }, | |
150 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
151 | }; | |
152 | ||
153 | const struct gdb_xml_attribute library_attributes[] = { | |
154 | { "name", GDB_XML_AF_NONE, NULL, NULL }, | |
155 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
156 | }; | |
157 | ||
158 | const struct gdb_xml_element library_list_children[] = { | |
159 | { "library", library_attributes, library_children, | |
160 | GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, | |
161 | library_list_start_library, NULL }, | |
162 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
163 | }; | |
164 | ||
165 | const struct gdb_xml_attribute library_list_attributes[] = { | |
166 | { "version", GDB_XML_AF_NONE, NULL, NULL }, | |
167 | { NULL, GDB_XML_AF_NONE, NULL, NULL } | |
168 | }; | |
169 | ||
170 | const struct gdb_xml_element library_list_elements[] = { | |
171 | { "library-list", library_list_attributes, library_list_children, | |
172 | GDB_XML_EF_NONE, library_list_start_list, NULL }, | |
173 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } | |
174 | }; | |
175 | ||
176 | static VEC(lm_info_p) * | |
177 | solib_target_parse_libraries (const char *library) | |
178 | { | |
179 | struct gdb_xml_parser *parser; | |
180 | VEC(lm_info_p) *result = NULL; | |
181 | struct cleanup *before_deleting_result, *back_to; | |
182 | ||
183 | back_to = make_cleanup (null_cleanup, NULL); | |
184 | parser = gdb_xml_create_parser_and_cleanup (_("target library list"), | |
185 | library_list_elements, &result); | |
186 | gdb_xml_use_dtd (parser, "library-list.dtd"); | |
187 | ||
188 | before_deleting_result = make_cleanup (solib_target_free_library_list, | |
189 | &result); | |
190 | ||
191 | if (gdb_xml_parse (parser, library) == 0) | |
192 | /* Parsed successfully, don't need to delete the result. */ | |
193 | discard_cleanups (before_deleting_result); | |
194 | ||
195 | do_cleanups (back_to); | |
196 | return result; | |
197 | } | |
198 | #endif | |
199 | ||
200 | static struct so_list * | |
201 | solib_target_current_sos (void) | |
202 | { | |
203 | struct so_list *new_solib, *start = NULL, *last = NULL; | |
204 | const char *library_document; | |
205 | VEC(lm_info_p) *library_list; | |
206 | struct lm_info *info; | |
207 | int ix; | |
208 | ||
209 | /* Fetch the list of shared libraries. */ | |
210 | library_document = target_read_stralloc (¤t_target, | |
211 | TARGET_OBJECT_LIBRARIES, | |
212 | NULL); | |
213 | if (library_document == NULL) | |
214 | return NULL; | |
215 | ||
216 | /* Parse the list. */ | |
217 | library_list = solib_target_parse_libraries (library_document); | |
218 | if (library_list == NULL) | |
219 | return NULL; | |
220 | ||
221 | /* Build a struct so_list for each entry on the list. */ | |
222 | for (ix = 0; VEC_iterate (lm_info_p, library_list, ix, info); ix++) | |
223 | { | |
224 | new_solib = XZALLOC (struct so_list); | |
225 | strncpy (new_solib->so_name, info->name, SO_NAME_MAX_PATH_SIZE - 1); | |
226 | new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
227 | strncpy (new_solib->so_original_name, info->name, | |
228 | SO_NAME_MAX_PATH_SIZE - 1); | |
229 | new_solib->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
230 | new_solib->lm_info = info; | |
231 | ||
232 | /* We no longer need this copy of the name. */ | |
233 | xfree (info->name); | |
234 | info->name = NULL; | |
235 | ||
236 | /* Add it to the list. */ | |
237 | if (!start) | |
238 | last = start = new_solib; | |
239 | else | |
240 | { | |
241 | last->next = new_solib; | |
242 | last = new_solib; | |
243 | } | |
244 | } | |
245 | ||
246 | /* Free the library list, but not its members. */ | |
247 | VEC_free (lm_info_p, library_list); | |
248 | ||
249 | return start; | |
250 | } | |
251 | ||
252 | static void | |
253 | solib_target_special_symbol_handling (void) | |
254 | { | |
255 | /* Nothing needed. */ | |
256 | } | |
257 | ||
258 | static void | |
259 | solib_target_solib_create_inferior_hook (void) | |
260 | { | |
261 | /* Nothing needed. */ | |
262 | } | |
263 | ||
264 | static void | |
265 | solib_target_clear_solib (void) | |
266 | { | |
267 | /* Nothing needed. */ | |
268 | } | |
269 | ||
270 | static void | |
271 | solib_target_free_so (struct so_list *so) | |
272 | { | |
273 | gdb_assert (so->lm_info->name == NULL); | |
274 | xfree (so->lm_info->offsets); | |
275 | VEC_free (CORE_ADDR, so->lm_info->segment_bases); | |
276 | xfree (so->lm_info); | |
277 | } | |
278 | ||
279 | static void | |
280 | solib_target_relocate_section_addresses (struct so_list *so, | |
281 | struct section_table *sec) | |
282 | { | |
283 | int flags = bfd_get_section_flags (sec->bfd, sec->the_bfd_section); | |
284 | CORE_ADDR offset; | |
285 | ||
286 | /* Build the offset table only once per object file. We can not do | |
287 | it any earlier, since we need to open the file first. */ | |
288 | if (so->lm_info->offsets == NULL) | |
289 | { | |
290 | struct symfile_segment_data *data; | |
291 | int num_sections = bfd_count_sections (so->abfd); | |
292 | ||
293 | so->lm_info->offsets = xzalloc (SIZEOF_N_SECTION_OFFSETS (num_sections)); | |
294 | ||
295 | data = get_symfile_segment_data (so->abfd); | |
296 | if (data == NULL) | |
297 | warning (_("Could not relocate shared library \"%s\": no segments"), | |
298 | so->so_name); | |
299 | else | |
300 | { | |
301 | ULONGEST orig_delta; | |
302 | int i; | |
303 | int num_bases = VEC_length (CORE_ADDR, so->lm_info->segment_bases); | |
304 | CORE_ADDR *segment_bases = VEC_address (CORE_ADDR, | |
305 | so->lm_info->segment_bases); | |
306 | ||
307 | if (!symfile_map_offsets_to_segments (so->abfd, data, | |
308 | so->lm_info->offsets, | |
309 | num_bases, segment_bases)) | |
310 | warning (_("Could not relocate shared library \"%s\": bad offsets"), | |
311 | so->so_name); | |
312 | ||
313 | /* Find the range of addresses to report for this library in | |
314 | "info sharedlibrary". Report any consecutive segments | |
315 | which were relocated as a single unit. */ | |
316 | gdb_assert (num_bases > 0); | |
317 | orig_delta = segment_bases[0] - data->segment_bases[0]; | |
318 | ||
319 | for (i = 1; i < data->num_segments; i++) | |
320 | { | |
321 | /* If we have run out of offsets, assume all remaining segments | |
322 | have the same offset. */ | |
323 | if (i >= num_bases) | |
324 | continue; | |
325 | ||
326 | /* If this segment does not have the same offset, do not include | |
327 | it in the library's range. */ | |
328 | if (segment_bases[i] - data->segment_bases[i] != orig_delta) | |
329 | break; | |
330 | } | |
331 | ||
332 | so->addr_low = segment_bases[0]; | |
333 | so->addr_high = (data->segment_bases[i - 1] | |
334 | + data->segment_sizes[i - 1] | |
335 | /* FIXME this must be needed! + orig_delta */); | |
336 | ||
337 | free_symfile_segment_data (data); | |
338 | } | |
339 | } | |
340 | ||
341 | offset = so->lm_info->offsets->offsets[sec->the_bfd_section->index]; | |
342 | sec->addr += offset; | |
343 | sec->endaddr += offset; | |
344 | } | |
345 | ||
346 | static int | |
347 | solib_target_open_symbol_file_object (void *from_ttyp) | |
348 | { | |
349 | /* We can't locate the main symbol file based on the target's | |
350 | knowledge; the user has to specify it. */ | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static int | |
355 | solib_target_in_dynsym_resolve_code (CORE_ADDR pc) | |
356 | { | |
357 | /* We don't have a range of addresses for the dynamic linker; there | |
358 | may not be one in the program's address space. So only report | |
359 | PLT entries (which may be import stubs). */ | |
360 | return in_plt_section (pc, NULL); | |
361 | } | |
362 | ||
363 | static struct target_so_ops solib_target_so_ops; | |
364 | ||
365 | extern initialize_file_ftype _initialize_solib_target; /* -Wmissing-prototypes */ | |
366 | ||
367 | void | |
368 | _initialize_solib_target (void) | |
369 | { | |
370 | solib_target_so_ops.relocate_section_addresses | |
371 | = solib_target_relocate_section_addresses; | |
372 | solib_target_so_ops.free_so = solib_target_free_so; | |
373 | solib_target_so_ops.clear_solib = solib_target_clear_solib; | |
374 | solib_target_so_ops.solib_create_inferior_hook | |
375 | = solib_target_solib_create_inferior_hook; | |
376 | solib_target_so_ops.special_symbol_handling | |
377 | = solib_target_special_symbol_handling; | |
378 | solib_target_so_ops.current_sos = solib_target_current_sos; | |
379 | solib_target_so_ops.open_symbol_file_object | |
380 | = solib_target_open_symbol_file_object; | |
381 | solib_target_so_ops.in_dynsym_resolve_code | |
382 | = solib_target_in_dynsym_resolve_code; | |
383 | ||
384 | current_target_so_ops = &solib_target_so_ops; | |
385 | } |