1 /* Definitions for targets which report shared library events. 2 3 Copyright (C) 2007-2012 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 /* Private data for each loaded library. */ 32 struct lm_info 33 { 34 /* The library's name. The name is normally kept in the struct 35 so_list; it is only here during XML parsing. */ 36 char *name; 37 38 /* The target can either specify segment bases or section bases, not 39 both. */ 40 41 /* The base addresses for each independently relocatable segment of 42 this shared library. */ 43 VEC(CORE_ADDR) *segment_bases; 44 45 /* The base addresses for each independently allocatable, 46 relocatable section of this shared library. */ 47 VEC(CORE_ADDR) *section_bases; 48 49 /* The cached offsets for each section of this shared library, 50 determined from SEGMENT_BASES, or SECTION_BASES. */ 51 struct section_offsets *offsets; 52 }; 53 54 typedef struct lm_info *lm_info_p; 55 DEF_VEC_P(lm_info_p); 56 57 #if !defined(HAVE_LIBEXPAT) 58 59 static VEC(lm_info_p) * 60 solib_target_parse_libraries (const char *library) 61 { 62 static int have_warned; 63 64 if (!have_warned) 65 { 66 have_warned = 1; 67 warning (_("Can not parse XML library list; XML support was disabled " 68 "at compile time")); 69 } 70 71 return NULL; 72 } 73 74 #else /* HAVE_LIBEXPAT */ 75 76 #include "xml-support.h" 77 78 /* Handle the start of a <segment> element. */ 79 80 static void 81 library_list_start_segment (struct gdb_xml_parser *parser, 82 const struct gdb_xml_element *element, 83 void *user_data, VEC(gdb_xml_value_s) *attributes) 84 { 85 VEC(lm_info_p) **list = user_data; 86 struct lm_info *last = VEC_last (lm_info_p, *list); 87 ULONGEST *address_p = xml_find_attribute (attributes, "address")->value; 88 CORE_ADDR address = (CORE_ADDR) *address_p; 89 90 if (last->section_bases != NULL) 91 gdb_xml_error (parser, 92 _("Library list with both segments and sections")); 93 94 VEC_safe_push (CORE_ADDR, last->segment_bases, address); 95 } 96 97 static void 98 library_list_start_section (struct gdb_xml_parser *parser, 99 const struct gdb_xml_element *element, 100 void *user_data, VEC(gdb_xml_value_s) *attributes) 101 { 102 VEC(lm_info_p) **list = user_data; 103 struct lm_info *last = VEC_last (lm_info_p, *list); 104 ULONGEST *address_p = xml_find_attribute (attributes, "address")->value; 105 CORE_ADDR address = (CORE_ADDR) *address_p; 106 107 if (last->segment_bases != NULL) 108 gdb_xml_error (parser, 109 _("Library list with both segments and sections")); 110 111 VEC_safe_push (CORE_ADDR, last->section_bases, address); 112 } 113 114 /* Handle the start of a <library> element. */ 115 116 static void 117 library_list_start_library (struct gdb_xml_parser *parser, 118 const struct gdb_xml_element *element, 119 void *user_data, VEC(gdb_xml_value_s) *attributes) 120 { 121 VEC(lm_info_p) **list = user_data; 122 struct lm_info *item = XZALLOC (struct lm_info); 123 const char *name = xml_find_attribute (attributes, "name")->value; 124 125 item->name = xstrdup (name); 126 VEC_safe_push (lm_info_p, *list, item); 127 } 128 129 static void 130 library_list_end_library (struct gdb_xml_parser *parser, 131 const struct gdb_xml_element *element, 132 void *user_data, const char *body_text) 133 { 134 VEC(lm_info_p) **list = user_data; 135 struct lm_info *lm_info = VEC_last (lm_info_p, *list); 136 137 if (lm_info->segment_bases == NULL 138 && lm_info->section_bases == NULL) 139 gdb_xml_error (parser, 140 _("No segment or section bases defined")); 141 } 142 143 144 /* Handle the start of a <library-list> element. */ 145 146 static void 147 library_list_start_list (struct gdb_xml_parser *parser, 148 const struct gdb_xml_element *element, 149 void *user_data, VEC(gdb_xml_value_s) *attributes) 150 { 151 char *version = xml_find_attribute (attributes, "version")->value; 152 153 if (strcmp (version, "1.0") != 0) 154 gdb_xml_error (parser, 155 _("Library list has unsupported version \"%s\""), 156 version); 157 } 158 159 /* Discard the constructed library list. */ 160 161 static void 162 solib_target_free_library_list (void *p) 163 { 164 VEC(lm_info_p) **result = p; 165 struct lm_info *info; 166 int ix; 167 168 for (ix = 0; VEC_iterate (lm_info_p, *result, ix, info); ix++) 169 { 170 xfree (info->name); 171 VEC_free (CORE_ADDR, info->segment_bases); 172 VEC_free (CORE_ADDR, info->section_bases); 173 xfree (info); 174 } 175 VEC_free (lm_info_p, *result); 176 *result = NULL; 177 } 178 179 /* The allowed elements and attributes for an XML library list. 180 The root element is a <library-list>. */ 181 182 static const struct gdb_xml_attribute segment_attributes[] = { 183 { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, 184 { NULL, GDB_XML_AF_NONE, NULL, NULL } 185 }; 186 187 static const struct gdb_xml_attribute section_attributes[] = { 188 { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, 189 { NULL, GDB_XML_AF_NONE, NULL, NULL } 190 }; 191 192 static const struct gdb_xml_element library_children[] = { 193 { "segment", segment_attributes, NULL, 194 GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, 195 library_list_start_segment, NULL }, 196 { "section", section_attributes, NULL, 197 GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, 198 library_list_start_section, NULL }, 199 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } 200 }; 201 202 static const struct gdb_xml_attribute library_attributes[] = { 203 { "name", GDB_XML_AF_NONE, NULL, NULL }, 204 { NULL, GDB_XML_AF_NONE, NULL, NULL } 205 }; 206 207 static const struct gdb_xml_element library_list_children[] = { 208 { "library", library_attributes, library_children, 209 GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, 210 library_list_start_library, library_list_end_library }, 211 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } 212 }; 213 214 static const struct gdb_xml_attribute library_list_attributes[] = { 215 { "version", GDB_XML_AF_NONE, NULL, NULL }, 216 { NULL, GDB_XML_AF_NONE, NULL, NULL } 217 }; 218 219 static const struct gdb_xml_element library_list_elements[] = { 220 { "library-list", library_list_attributes, library_list_children, 221 GDB_XML_EF_NONE, library_list_start_list, NULL }, 222 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } 223 }; 224 225 static VEC(lm_info_p) * 226 solib_target_parse_libraries (const char *library) 227 { 228 VEC(lm_info_p) *result = NULL; 229 struct cleanup *back_to = make_cleanup (solib_target_free_library_list, 230 &result); 231 232 if (gdb_xml_parse_quick (_("target library list"), "library-list.dtd", 233 library_list_elements, library, &result) == 0) 234 { 235 /* Parsed successfully, keep the result. */ 236 discard_cleanups (back_to); 237 return result; 238 } 239 240 do_cleanups (back_to); 241 return NULL; 242 } 243 #endif 244 245 static struct so_list * 246 solib_target_current_sos (void) 247 { 248 struct so_list *new_solib, *start = NULL, *last = NULL; 249 const char *library_document; 250 VEC(lm_info_p) *library_list; 251 struct lm_info *info; 252 int ix; 253 254 /* Fetch the list of shared libraries. */ 255 library_document = target_read_stralloc (¤t_target, 256 TARGET_OBJECT_LIBRARIES, 257 NULL); 258 if (library_document == NULL) 259 return NULL; 260 261 /* Parse the list. */ 262 library_list = solib_target_parse_libraries (library_document); 263 if (library_list == NULL) 264 return NULL; 265 266 /* Build a struct so_list for each entry on the list. */ 267 for (ix = 0; VEC_iterate (lm_info_p, library_list, ix, info); ix++) 268 { 269 new_solib = XZALLOC (struct so_list); 270 strncpy (new_solib->so_name, info->name, SO_NAME_MAX_PATH_SIZE - 1); 271 new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; 272 strncpy (new_solib->so_original_name, info->name, 273 SO_NAME_MAX_PATH_SIZE - 1); 274 new_solib->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; 275 new_solib->lm_info = info; 276 277 /* We no longer need this copy of the name. */ 278 xfree (info->name); 279 info->name = NULL; 280 281 /* Add it to the list. */ 282 if (!start) 283 last = start = new_solib; 284 else 285 { 286 last->next = new_solib; 287 last = new_solib; 288 } 289 } 290 291 /* Free the library list, but not its members. */ 292 VEC_free (lm_info_p, library_list); 293 294 return start; 295 } 296 297 static void 298 solib_target_special_symbol_handling (void) 299 { 300 /* Nothing needed. */ 301 } 302 303 static void 304 solib_target_solib_create_inferior_hook (int from_tty) 305 { 306 /* Nothing needed. */ 307 } 308 309 static void 310 solib_target_clear_solib (void) 311 { 312 /* Nothing needed. */ 313 } 314 315 static void 316 solib_target_free_so (struct so_list *so) 317 { 318 gdb_assert (so->lm_info->name == NULL); 319 xfree (so->lm_info->offsets); 320 VEC_free (CORE_ADDR, so->lm_info->segment_bases); 321 xfree (so->lm_info); 322 } 323 324 static void 325 solib_target_relocate_section_addresses (struct so_list *so, 326 struct target_section *sec) 327 { 328 int flags = bfd_get_section_flags (sec->bfd, sec->the_bfd_section); 329 CORE_ADDR offset; 330 331 /* Build the offset table only once per object file. We can not do 332 it any earlier, since we need to open the file first. */ 333 if (so->lm_info->offsets == NULL) 334 { 335 int num_sections = bfd_count_sections (so->abfd); 336 337 so->lm_info->offsets = xzalloc (SIZEOF_N_SECTION_OFFSETS (num_sections)); 338 339 if (so->lm_info->section_bases) 340 { 341 int i; 342 asection *sect; 343 int num_section_bases 344 = VEC_length (CORE_ADDR, so->lm_info->section_bases); 345 int num_alloc_sections = 0; 346 347 for (i = 0, sect = so->abfd->sections; 348 sect != NULL; 349 i++, sect = sect->next) 350 if ((bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC)) 351 num_alloc_sections++; 352 353 if (num_alloc_sections != num_section_bases) 354 warning (_("\ 355 Could not relocate shared library \"%s\": wrong number of ALLOC sections"), 356 so->so_name); 357 else 358 { 359 int bases_index = 0; 360 int found_range = 0; 361 CORE_ADDR *section_bases; 362 363 section_bases = VEC_address (CORE_ADDR, 364 so->lm_info->section_bases); 365 366 so->addr_low = ~(CORE_ADDR) 0; 367 so->addr_high = 0; 368 for (i = 0, sect = so->abfd->sections; 369 sect != NULL; 370 i++, sect = sect->next) 371 { 372 if (!(bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC)) 373 continue; 374 if (bfd_section_size (so->abfd, sect) > 0) 375 { 376 CORE_ADDR low, high; 377 378 low = section_bases[i]; 379 high = low + bfd_section_size (so->abfd, sect) - 1; 380 381 if (low < so->addr_low) 382 so->addr_low = low; 383 if (high > so->addr_high) 384 so->addr_high = high; 385 gdb_assert (so->addr_low <= so->addr_high); 386 found_range = 1; 387 } 388 so->lm_info->offsets->offsets[i] 389 = section_bases[bases_index]; 390 bases_index++; 391 } 392 if (!found_range) 393 so->addr_low = so->addr_high = 0; 394 gdb_assert (so->addr_low <= so->addr_high); 395 } 396 } 397 else if (so->lm_info->segment_bases) 398 { 399 struct symfile_segment_data *data; 400 401 data = get_symfile_segment_data (so->abfd); 402 if (data == NULL) 403 warning (_("\ 404 Could not relocate shared library \"%s\": no segments"), so->so_name); 405 else 406 { 407 ULONGEST orig_delta; 408 int i; 409 int num_bases; 410 CORE_ADDR *segment_bases; 411 412 num_bases = VEC_length (CORE_ADDR, so->lm_info->segment_bases); 413 segment_bases = VEC_address (CORE_ADDR, 414 so->lm_info->segment_bases); 415 416 if (!symfile_map_offsets_to_segments (so->abfd, data, 417 so->lm_info->offsets, 418 num_bases, segment_bases)) 419 warning (_("\ 420 Could not relocate shared library \"%s\": bad offsets"), so->so_name); 421 422 /* Find the range of addresses to report for this library in 423 "info sharedlibrary". Report any consecutive segments 424 which were relocated as a single unit. */ 425 gdb_assert (num_bases > 0); 426 orig_delta = segment_bases[0] - data->segment_bases[0]; 427 428 for (i = 1; i < data->num_segments; i++) 429 { 430 /* If we have run out of offsets, assume all 431 remaining segments have the same offset. */ 432 if (i >= num_bases) 433 continue; 434 435 /* If this segment does not have the same offset, do 436 not include it in the library's range. */ 437 if (segment_bases[i] - data->segment_bases[i] != orig_delta) 438 break; 439 } 440 441 so->addr_low = segment_bases[0]; 442 so->addr_high = (data->segment_bases[i - 1] 443 + data->segment_sizes[i - 1] 444 + orig_delta); 445 gdb_assert (so->addr_low <= so->addr_high); 446 447 free_symfile_segment_data (data); 448 } 449 } 450 } 451 452 offset = so->lm_info->offsets->offsets[sec->the_bfd_section->index]; 453 sec->addr += offset; 454 sec->endaddr += offset; 455 } 456 457 static int 458 solib_target_open_symbol_file_object (void *from_ttyp) 459 { 460 /* We can't locate the main symbol file based on the target's 461 knowledge; the user has to specify it. */ 462 return 0; 463 } 464 465 static int 466 solib_target_in_dynsym_resolve_code (CORE_ADDR pc) 467 { 468 /* We don't have a range of addresses for the dynamic linker; there 469 may not be one in the program's address space. So only report 470 PLT entries (which may be import stubs). */ 471 return in_plt_section (pc, NULL); 472 } 473 474 struct target_so_ops solib_target_so_ops; 475 476 /* -Wmissing-prototypes */ 477 extern initialize_file_ftype _initialize_solib_target; 478 479 void 480 _initialize_solib_target (void) 481 { 482 solib_target_so_ops.relocate_section_addresses 483 = solib_target_relocate_section_addresses; 484 solib_target_so_ops.free_so = solib_target_free_so; 485 solib_target_so_ops.clear_solib = solib_target_clear_solib; 486 solib_target_so_ops.solib_create_inferior_hook 487 = solib_target_solib_create_inferior_hook; 488 solib_target_so_ops.special_symbol_handling 489 = solib_target_special_symbol_handling; 490 solib_target_so_ops.current_sos = solib_target_current_sos; 491 solib_target_so_ops.open_symbol_file_object 492 = solib_target_open_symbol_file_object; 493 solib_target_so_ops.in_dynsym_resolve_code 494 = solib_target_in_dynsym_resolve_code; 495 solib_target_so_ops.bfd_open = solib_bfd_open; 496 497 /* Set current_target_so_ops to solib_target_so_ops if not already 498 set. */ 499 if (current_target_so_ops == 0) 500 current_target_so_ops = &solib_target_so_ops; 501 } 502