| 1 | /* Definitions for targets which report shared library events. |
| 2 | |
| 3 | Copyright (C) 2007-2020 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 "solib-target.h" |
| 27 | #include <vector> |
| 28 | |
| 29 | /* Private data for each loaded library. */ |
| 30 | struct lm_info_target : public lm_info_base |
| 31 | { |
| 32 | /* The library's name. The name is normally kept in the struct |
| 33 | so_list; it is only here during XML parsing. */ |
| 34 | std::string name; |
| 35 | |
| 36 | /* The target can either specify segment bases or section bases, not |
| 37 | both. */ |
| 38 | |
| 39 | /* The base addresses for each independently relocatable segment of |
| 40 | this shared library. */ |
| 41 | std::vector<CORE_ADDR> segment_bases; |
| 42 | |
| 43 | /* The base addresses for each independently allocatable, |
| 44 | relocatable section of this shared library. */ |
| 45 | std::vector<CORE_ADDR> section_bases; |
| 46 | |
| 47 | /* The cached offsets for each section of this shared library, |
| 48 | determined from SEGMENT_BASES, or SECTION_BASES. */ |
| 49 | section_offsets offsets; |
| 50 | }; |
| 51 | |
| 52 | typedef std::vector<std::unique_ptr<lm_info_target>> lm_info_vector; |
| 53 | |
| 54 | #if !defined(HAVE_LIBEXPAT) |
| 55 | |
| 56 | static lm_info_vector |
| 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 lm_info_vector (); |
| 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, |
| 81 | std::vector<gdb_xml_value> &attributes) |
| 82 | { |
| 83 | lm_info_vector *list = (lm_info_vector *) user_data; |
| 84 | lm_info_target *last = list->back ().get (); |
| 85 | ULONGEST *address_p |
| 86 | = (ULONGEST *) xml_find_attribute (attributes, "address")->value.get (); |
| 87 | CORE_ADDR address = (CORE_ADDR) *address_p; |
| 88 | |
| 89 | if (!last->section_bases.empty ()) |
| 90 | gdb_xml_error (parser, |
| 91 | _("Library list with both segments and sections")); |
| 92 | |
| 93 | last->segment_bases.push_back (address); |
| 94 | } |
| 95 | |
| 96 | static void |
| 97 | library_list_start_section (struct gdb_xml_parser *parser, |
| 98 | const struct gdb_xml_element *element, |
| 99 | void *user_data, |
| 100 | std::vector<gdb_xml_value> &attributes) |
| 101 | { |
| 102 | lm_info_vector *list = (lm_info_vector *) user_data; |
| 103 | lm_info_target *last = list->back ().get (); |
| 104 | ULONGEST *address_p |
| 105 | = (ULONGEST *) xml_find_attribute (attributes, "address")->value.get (); |
| 106 | CORE_ADDR address = (CORE_ADDR) *address_p; |
| 107 | |
| 108 | if (!last->segment_bases.empty ()) |
| 109 | gdb_xml_error (parser, |
| 110 | _("Library list with both segments and sections")); |
| 111 | |
| 112 | last->section_bases.push_back (address); |
| 113 | } |
| 114 | |
| 115 | /* Handle the start of a <library> element. */ |
| 116 | |
| 117 | static void |
| 118 | library_list_start_library (struct gdb_xml_parser *parser, |
| 119 | const struct gdb_xml_element *element, |
| 120 | void *user_data, |
| 121 | std::vector<gdb_xml_value> &attributes) |
| 122 | { |
| 123 | lm_info_vector *list = (lm_info_vector *) user_data; |
| 124 | lm_info_target *item = new lm_info_target; |
| 125 | item->name |
| 126 | = (const char *) xml_find_attribute (attributes, "name")->value.get (); |
| 127 | |
| 128 | list->emplace_back (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 | lm_info_vector *list = (lm_info_vector *) user_data; |
| 137 | lm_info_target *lm_info = list->back ().get (); |
| 138 | |
| 139 | if (lm_info->segment_bases.empty () && lm_info->section_bases.empty ()) |
| 140 | gdb_xml_error (parser, _("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, |
| 150 | std::vector<gdb_xml_value> &attributes) |
| 151 | { |
| 152 | struct gdb_xml_value *version = xml_find_attribute (attributes, "version"); |
| 153 | |
| 154 | /* #FIXED attribute may be omitted, Expat returns NULL in such case. */ |
| 155 | if (version != NULL) |
| 156 | { |
| 157 | const char *string = (const char *) version->value.get (); |
| 158 | |
| 159 | if (strcmp (string, "1.0") != 0) |
| 160 | gdb_xml_error (parser, |
| 161 | _("Library list has unsupported version \"%s\""), |
| 162 | string); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | /* The allowed elements and attributes for an XML library list. |
| 167 | The root element is a <library-list>. */ |
| 168 | |
| 169 | static const struct gdb_xml_attribute segment_attributes[] = { |
| 170 | { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, |
| 171 | { NULL, GDB_XML_AF_NONE, NULL, NULL } |
| 172 | }; |
| 173 | |
| 174 | static const struct gdb_xml_attribute section_attributes[] = { |
| 175 | { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, |
| 176 | { NULL, GDB_XML_AF_NONE, NULL, NULL } |
| 177 | }; |
| 178 | |
| 179 | static const struct gdb_xml_element library_children[] = { |
| 180 | { "segment", segment_attributes, NULL, |
| 181 | GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, |
| 182 | library_list_start_segment, NULL }, |
| 183 | { "section", section_attributes, NULL, |
| 184 | GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, |
| 185 | library_list_start_section, NULL }, |
| 186 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
| 187 | }; |
| 188 | |
| 189 | static const struct gdb_xml_attribute library_attributes[] = { |
| 190 | { "name", GDB_XML_AF_NONE, NULL, NULL }, |
| 191 | { NULL, GDB_XML_AF_NONE, NULL, NULL } |
| 192 | }; |
| 193 | |
| 194 | static const struct gdb_xml_element library_list_children[] = { |
| 195 | { "library", library_attributes, library_children, |
| 196 | GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, |
| 197 | library_list_start_library, library_list_end_library }, |
| 198 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
| 199 | }; |
| 200 | |
| 201 | static const struct gdb_xml_attribute library_list_attributes[] = { |
| 202 | { "version", GDB_XML_AF_OPTIONAL, NULL, NULL }, |
| 203 | { NULL, GDB_XML_AF_NONE, NULL, NULL } |
| 204 | }; |
| 205 | |
| 206 | static const struct gdb_xml_element library_list_elements[] = { |
| 207 | { "library-list", library_list_attributes, library_list_children, |
| 208 | GDB_XML_EF_NONE, library_list_start_list, NULL }, |
| 209 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
| 210 | }; |
| 211 | |
| 212 | static lm_info_vector |
| 213 | solib_target_parse_libraries (const char *library) |
| 214 | { |
| 215 | lm_info_vector result; |
| 216 | |
| 217 | if (gdb_xml_parse_quick (_("target library list"), "library-list.dtd", |
| 218 | library_list_elements, library, &result) == 0) |
| 219 | { |
| 220 | /* Parsed successfully. */ |
| 221 | return result; |
| 222 | } |
| 223 | |
| 224 | result.clear (); |
| 225 | return result; |
| 226 | } |
| 227 | #endif |
| 228 | |
| 229 | static struct so_list * |
| 230 | solib_target_current_sos (void) |
| 231 | { |
| 232 | struct so_list *new_solib, *start = NULL, *last = NULL; |
| 233 | |
| 234 | /* Fetch the list of shared libraries. */ |
| 235 | gdb::optional<gdb::char_vector> library_document |
| 236 | = target_read_stralloc (current_top_target (), TARGET_OBJECT_LIBRARIES, |
| 237 | NULL); |
| 238 | if (!library_document) |
| 239 | return NULL; |
| 240 | |
| 241 | /* Parse the list. */ |
| 242 | lm_info_vector library_list |
| 243 | = solib_target_parse_libraries (library_document->data ()); |
| 244 | |
| 245 | if (library_list.empty ()) |
| 246 | return NULL; |
| 247 | |
| 248 | /* Build a struct so_list for each entry on the list. */ |
| 249 | for (auto &&info : library_list) |
| 250 | { |
| 251 | new_solib = XCNEW (struct so_list); |
| 252 | strncpy (new_solib->so_name, info->name.c_str (), |
| 253 | SO_NAME_MAX_PATH_SIZE - 1); |
| 254 | new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
| 255 | strncpy (new_solib->so_original_name, info->name.c_str (), |
| 256 | SO_NAME_MAX_PATH_SIZE - 1); |
| 257 | new_solib->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
| 258 | |
| 259 | /* We no longer need this copy of the name. */ |
| 260 | info->name.clear (); |
| 261 | |
| 262 | new_solib->lm_info = info.release (); |
| 263 | |
| 264 | /* Add it to the list. */ |
| 265 | if (!start) |
| 266 | last = start = new_solib; |
| 267 | else |
| 268 | { |
| 269 | last->next = new_solib; |
| 270 | last = new_solib; |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | return start; |
| 275 | } |
| 276 | |
| 277 | static void |
| 278 | solib_target_solib_create_inferior_hook (int from_tty) |
| 279 | { |
| 280 | /* Nothing needed. */ |
| 281 | } |
| 282 | |
| 283 | static void |
| 284 | solib_target_clear_solib (void) |
| 285 | { |
| 286 | /* Nothing needed. */ |
| 287 | } |
| 288 | |
| 289 | static void |
| 290 | solib_target_free_so (struct so_list *so) |
| 291 | { |
| 292 | lm_info_target *li = (lm_info_target *) so->lm_info; |
| 293 | |
| 294 | gdb_assert (li->name.empty ()); |
| 295 | |
| 296 | delete li; |
| 297 | } |
| 298 | |
| 299 | static void |
| 300 | solib_target_relocate_section_addresses (struct so_list *so, |
| 301 | struct target_section *sec) |
| 302 | { |
| 303 | CORE_ADDR offset; |
| 304 | lm_info_target *li = (lm_info_target *) so->lm_info; |
| 305 | |
| 306 | /* Build the offset table only once per object file. We can not do |
| 307 | it any earlier, since we need to open the file first. */ |
| 308 | if (li->offsets.empty ()) |
| 309 | { |
| 310 | int num_sections = gdb_bfd_count_sections (so->abfd); |
| 311 | |
| 312 | li->offsets.assign (num_sections, 0); |
| 313 | |
| 314 | if (!li->section_bases.empty ()) |
| 315 | { |
| 316 | int i; |
| 317 | asection *sect; |
| 318 | int num_alloc_sections = 0; |
| 319 | |
| 320 | for (i = 0, sect = so->abfd->sections; |
| 321 | sect != NULL; |
| 322 | i++, sect = sect->next) |
| 323 | if ((bfd_section_flags (sect) & SEC_ALLOC)) |
| 324 | num_alloc_sections++; |
| 325 | |
| 326 | if (num_alloc_sections != li->section_bases.size ()) |
| 327 | warning (_("\ |
| 328 | Could not relocate shared library \"%s\": wrong number of ALLOC sections"), |
| 329 | so->so_name); |
| 330 | else |
| 331 | { |
| 332 | int bases_index = 0; |
| 333 | int found_range = 0; |
| 334 | |
| 335 | so->addr_low = ~(CORE_ADDR) 0; |
| 336 | so->addr_high = 0; |
| 337 | for (i = 0, sect = so->abfd->sections; |
| 338 | sect != NULL; |
| 339 | i++, sect = sect->next) |
| 340 | { |
| 341 | if (!(bfd_section_flags (sect) & SEC_ALLOC)) |
| 342 | continue; |
| 343 | if (bfd_section_size (sect) > 0) |
| 344 | { |
| 345 | CORE_ADDR low, high; |
| 346 | |
| 347 | low = li->section_bases[i]; |
| 348 | high = low + bfd_section_size (sect) - 1; |
| 349 | |
| 350 | if (low < so->addr_low) |
| 351 | so->addr_low = low; |
| 352 | if (high > so->addr_high) |
| 353 | so->addr_high = high; |
| 354 | gdb_assert (so->addr_low <= so->addr_high); |
| 355 | found_range = 1; |
| 356 | } |
| 357 | li->offsets[i] = li->section_bases[bases_index]; |
| 358 | bases_index++; |
| 359 | } |
| 360 | if (!found_range) |
| 361 | so->addr_low = so->addr_high = 0; |
| 362 | gdb_assert (so->addr_low <= so->addr_high); |
| 363 | } |
| 364 | } |
| 365 | else if (!li->segment_bases.empty ()) |
| 366 | { |
| 367 | symfile_segment_data_up data |
| 368 | = get_symfile_segment_data (so->abfd); |
| 369 | |
| 370 | if (data == NULL) |
| 371 | warning (_("\ |
| 372 | Could not relocate shared library \"%s\": no segments"), so->so_name); |
| 373 | else |
| 374 | { |
| 375 | ULONGEST orig_delta; |
| 376 | int i; |
| 377 | |
| 378 | if (!symfile_map_offsets_to_segments (so->abfd, data.get (), |
| 379 | li->offsets, |
| 380 | li->segment_bases.size (), |
| 381 | li->segment_bases.data ())) |
| 382 | warning (_("\ |
| 383 | Could not relocate shared library \"%s\": bad offsets"), so->so_name); |
| 384 | |
| 385 | /* Find the range of addresses to report for this library in |
| 386 | "info sharedlibrary". Report any consecutive segments |
| 387 | which were relocated as a single unit. */ |
| 388 | gdb_assert (li->segment_bases.size () > 0); |
| 389 | orig_delta = li->segment_bases[0] - data->segments[0].base; |
| 390 | |
| 391 | for (i = 1; i < data->segments.size (); i++) |
| 392 | { |
| 393 | /* If we have run out of offsets, assume all |
| 394 | remaining segments have the same offset. */ |
| 395 | if (i >= li->segment_bases.size ()) |
| 396 | continue; |
| 397 | |
| 398 | /* If this segment does not have the same offset, do |
| 399 | not include it in the library's range. */ |
| 400 | if (li->segment_bases[i] - data->segments[i].base |
| 401 | != orig_delta) |
| 402 | break; |
| 403 | } |
| 404 | |
| 405 | so->addr_low = li->segment_bases[0]; |
| 406 | so->addr_high = (data->segments[i - 1].base |
| 407 | + data->segments[i - 1].size |
| 408 | + orig_delta); |
| 409 | gdb_assert (so->addr_low <= so->addr_high); |
| 410 | } |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | offset = li->offsets[gdb_bfd_section_index (sec->the_bfd_section->owner, |
| 415 | sec->the_bfd_section)]; |
| 416 | sec->addr += offset; |
| 417 | sec->endaddr += offset; |
| 418 | } |
| 419 | |
| 420 | static int |
| 421 | solib_target_open_symbol_file_object (int from_tty) |
| 422 | { |
| 423 | /* We can't locate the main symbol file based on the target's |
| 424 | knowledge; the user has to specify it. */ |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | static int |
| 429 | solib_target_in_dynsym_resolve_code (CORE_ADDR pc) |
| 430 | { |
| 431 | /* We don't have a range of addresses for the dynamic linker; there |
| 432 | may not be one in the program's address space. So only report |
| 433 | PLT entries (which may be import stubs). */ |
| 434 | return in_plt_section (pc); |
| 435 | } |
| 436 | |
| 437 | struct target_so_ops solib_target_so_ops; |
| 438 | |
| 439 | void _initialize_solib_target (); |
| 440 | void |
| 441 | _initialize_solib_target () |
| 442 | { |
| 443 | solib_target_so_ops.relocate_section_addresses |
| 444 | = solib_target_relocate_section_addresses; |
| 445 | solib_target_so_ops.free_so = solib_target_free_so; |
| 446 | solib_target_so_ops.clear_solib = solib_target_clear_solib; |
| 447 | solib_target_so_ops.solib_create_inferior_hook |
| 448 | = solib_target_solib_create_inferior_hook; |
| 449 | solib_target_so_ops.current_sos = solib_target_current_sos; |
| 450 | solib_target_so_ops.open_symbol_file_object |
| 451 | = solib_target_open_symbol_file_object; |
| 452 | solib_target_so_ops.in_dynsym_resolve_code |
| 453 | = solib_target_in_dynsym_resolve_code; |
| 454 | solib_target_so_ops.bfd_open = solib_bfd_open; |
| 455 | |
| 456 | /* Set current_target_so_ops to solib_target_so_ops if not already |
| 457 | set. */ |
| 458 | if (current_target_so_ops == 0) |
| 459 | current_target_so_ops = &solib_target_so_ops; |
| 460 | } |