| 1 | /* Copyright (C) 2013-2017 Free Software Foundation, Inc. |
| 2 | |
| 3 | This file is part of GDB. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include "defs.h" |
| 19 | #include "solib-aix.h" |
| 20 | #include "solist.h" |
| 21 | #include "inferior.h" |
| 22 | #include "gdb_bfd.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "objfiles.h" |
| 25 | #include "symtab.h" |
| 26 | #include "xcoffread.h" |
| 27 | #include "observer.h" |
| 28 | #include "gdbcmd.h" |
| 29 | |
| 30 | /* Variable controlling the output of the debugging traces for |
| 31 | this module. */ |
| 32 | static int solib_aix_debug; |
| 33 | |
| 34 | /* Our private data in struct so_list. */ |
| 35 | |
| 36 | struct lm_info_aix : public lm_info_base |
| 37 | { |
| 38 | /* The name of the file mapped by the loader. Apart from the entry |
| 39 | for the main executable, this is usually a shared library (which, |
| 40 | on AIX, is an archive library file, created using the "ar" |
| 41 | command). */ |
| 42 | std::string filename; |
| 43 | |
| 44 | /* The name of the shared object file with the actual dynamic |
| 45 | loading dependency. This may be empty (Eg. main executable). */ |
| 46 | std::string member_name; |
| 47 | |
| 48 | /* The address in inferior memory where the text section got mapped. */ |
| 49 | CORE_ADDR text_addr = 0; |
| 50 | |
| 51 | /* The size of the text section, obtained via the loader data. */ |
| 52 | ULONGEST text_size = 0; |
| 53 | |
| 54 | /* The address in inferior memory where the data section got mapped. */ |
| 55 | CORE_ADDR data_addr = 0; |
| 56 | |
| 57 | /* The size of the data section, obtained via the loader data. */ |
| 58 | ULONGEST data_size = 0; |
| 59 | }; |
| 60 | |
| 61 | typedef lm_info_aix *lm_info_aix_p; |
| 62 | DEF_VEC_P(lm_info_aix_p); |
| 63 | |
| 64 | /* This module's per-inferior data. */ |
| 65 | |
| 66 | struct solib_aix_inferior_data |
| 67 | { |
| 68 | /* The list of shared libraries. NULL if not computed yet. |
| 69 | |
| 70 | Note that the first element of this list is always the main |
| 71 | executable, which is not technically a shared library. But |
| 72 | we need that information to perform its relocation, and |
| 73 | the same principles applied to shared libraries also apply |
| 74 | to the main executable. So it's simpler to keep it as part |
| 75 | of this list. */ |
| 76 | VEC (lm_info_aix_p) *library_list; |
| 77 | }; |
| 78 | |
| 79 | /* Key to our per-inferior data. */ |
| 80 | static const struct inferior_data *solib_aix_inferior_data_handle; |
| 81 | |
| 82 | /* Return this module's data for the given inferior. |
| 83 | If none is found, add a zero'ed one now. */ |
| 84 | |
| 85 | static struct solib_aix_inferior_data * |
| 86 | get_solib_aix_inferior_data (struct inferior *inf) |
| 87 | { |
| 88 | struct solib_aix_inferior_data *data; |
| 89 | |
| 90 | data = ((struct solib_aix_inferior_data *) |
| 91 | inferior_data (inf, solib_aix_inferior_data_handle)); |
| 92 | if (data == NULL) |
| 93 | { |
| 94 | data = XCNEW (struct solib_aix_inferior_data); |
| 95 | set_inferior_data (inf, solib_aix_inferior_data_handle, data); |
| 96 | } |
| 97 | |
| 98 | return data; |
| 99 | } |
| 100 | |
| 101 | #if !defined(HAVE_LIBEXPAT) |
| 102 | |
| 103 | /* Dummy implementation if XML support is not compiled in. */ |
| 104 | |
| 105 | static VEC (lm_info_aix_p) * |
| 106 | solib_aix_parse_libraries (const char *library) |
| 107 | { |
| 108 | static int have_warned; |
| 109 | |
| 110 | if (!have_warned) |
| 111 | { |
| 112 | have_warned = 1; |
| 113 | warning (_("Can not parse XML library list; XML support was disabled " |
| 114 | "at compile time")); |
| 115 | } |
| 116 | |
| 117 | return NULL; |
| 118 | } |
| 119 | |
| 120 | /* Dummy implementation if XML support is not compiled in. */ |
| 121 | |
| 122 | static void |
| 123 | solib_aix_free_library_list (void *p) |
| 124 | { |
| 125 | } |
| 126 | |
| 127 | #else /* HAVE_LIBEXPAT */ |
| 128 | |
| 129 | #include "xml-support.h" |
| 130 | |
| 131 | /* Handle the start of a <library> element. */ |
| 132 | |
| 133 | static void |
| 134 | library_list_start_library (struct gdb_xml_parser *parser, |
| 135 | const struct gdb_xml_element *element, |
| 136 | void *user_data, |
| 137 | VEC (gdb_xml_value_s) *attributes) |
| 138 | { |
| 139 | VEC (lm_info_aix_p) **list = (VEC (lm_info_aix_p) **) user_data; |
| 140 | lm_info_aix *item = new lm_info_aix; |
| 141 | struct gdb_xml_value *attr; |
| 142 | |
| 143 | attr = xml_find_attribute (attributes, "name"); |
| 144 | item->filename = xstrdup ((const char *) attr->value); |
| 145 | |
| 146 | attr = xml_find_attribute (attributes, "member"); |
| 147 | if (attr != NULL) |
| 148 | item->member_name = xstrdup ((const char *) attr->value); |
| 149 | |
| 150 | attr = xml_find_attribute (attributes, "text_addr"); |
| 151 | item->text_addr = * (ULONGEST *) attr->value; |
| 152 | |
| 153 | attr = xml_find_attribute (attributes, "text_size"); |
| 154 | item->text_size = * (ULONGEST *) attr->value; |
| 155 | |
| 156 | attr = xml_find_attribute (attributes, "data_addr"); |
| 157 | item->data_addr = * (ULONGEST *) attr->value; |
| 158 | |
| 159 | attr = xml_find_attribute (attributes, "data_size"); |
| 160 | item->data_size = * (ULONGEST *) attr->value; |
| 161 | |
| 162 | VEC_safe_push (lm_info_aix_p, *list, item); |
| 163 | } |
| 164 | |
| 165 | /* Handle the start of a <library-list-aix> element. */ |
| 166 | |
| 167 | static void |
| 168 | library_list_start_list (struct gdb_xml_parser *parser, |
| 169 | const struct gdb_xml_element *element, |
| 170 | void *user_data, VEC (gdb_xml_value_s) *attributes) |
| 171 | { |
| 172 | char *version = (char *) xml_find_attribute (attributes, "version")->value; |
| 173 | |
| 174 | if (strcmp (version, "1.0") != 0) |
| 175 | gdb_xml_error (parser, |
| 176 | _("Library list has unsupported version \"%s\""), |
| 177 | version); |
| 178 | } |
| 179 | |
| 180 | /* Discard the constructed library list. */ |
| 181 | |
| 182 | static void |
| 183 | solib_aix_free_library_list (void *p) |
| 184 | { |
| 185 | VEC (lm_info_aix_p) **result = (VEC (lm_info_aix_p) **) p; |
| 186 | lm_info_aix *info; |
| 187 | int ix; |
| 188 | |
| 189 | if (solib_aix_debug) |
| 190 | fprintf_unfiltered (gdb_stdlog, "DEBUG: solib_aix_free_library_list\n"); |
| 191 | |
| 192 | for (ix = 0; VEC_iterate (lm_info_aix_p, *result, ix, info); ix++) |
| 193 | delete info; |
| 194 | |
| 195 | VEC_free (lm_info_aix_p, *result); |
| 196 | *result = NULL; |
| 197 | } |
| 198 | |
| 199 | /* The allowed elements and attributes for an AIX library list |
| 200 | described in XML format. The root element is a <library-list-aix>. */ |
| 201 | |
| 202 | static const struct gdb_xml_attribute library_attributes[] = |
| 203 | { |
| 204 | { "name", GDB_XML_AF_NONE, NULL, NULL }, |
| 205 | { "member", GDB_XML_AF_OPTIONAL, NULL, NULL }, |
| 206 | { "text_addr", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, |
| 207 | { "text_size", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, |
| 208 | { "data_addr", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, |
| 209 | { "data_size", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, |
| 210 | { NULL, GDB_XML_AF_NONE, NULL, NULL } |
| 211 | }; |
| 212 | |
| 213 | static const struct gdb_xml_element library_list_children[] = |
| 214 | { |
| 215 | { "library", library_attributes, NULL, |
| 216 | GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, |
| 217 | library_list_start_library, NULL}, |
| 218 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
| 219 | }; |
| 220 | |
| 221 | static const struct gdb_xml_attribute library_list_attributes[] = |
| 222 | { |
| 223 | { "version", GDB_XML_AF_NONE, NULL, NULL }, |
| 224 | { NULL, GDB_XML_AF_NONE, NULL, NULL } |
| 225 | }; |
| 226 | |
| 227 | static const struct gdb_xml_element library_list_elements[] = |
| 228 | { |
| 229 | { "library-list-aix", library_list_attributes, library_list_children, |
| 230 | GDB_XML_EF_NONE, library_list_start_list, NULL }, |
| 231 | { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
| 232 | }; |
| 233 | |
| 234 | /* Parse LIBRARY, a string containing the loader info in XML format, |
| 235 | and return an lm_info_aix_p vector. |
| 236 | |
| 237 | Return NULL if the parsing failed. */ |
| 238 | |
| 239 | static VEC (lm_info_aix_p) * |
| 240 | solib_aix_parse_libraries (const char *library) |
| 241 | { |
| 242 | VEC (lm_info_aix_p) *result = NULL; |
| 243 | struct cleanup *back_to = make_cleanup (solib_aix_free_library_list, |
| 244 | &result); |
| 245 | |
| 246 | if (gdb_xml_parse_quick (_("aix library list"), "library-list-aix.dtd", |
| 247 | library_list_elements, library, &result) == 0) |
| 248 | { |
| 249 | /* Parsed successfully, keep the result. */ |
| 250 | discard_cleanups (back_to); |
| 251 | return result; |
| 252 | } |
| 253 | |
| 254 | do_cleanups (back_to); |
| 255 | return NULL; |
| 256 | } |
| 257 | |
| 258 | #endif /* HAVE_LIBEXPAT */ |
| 259 | |
| 260 | /* Return the loader info for the given inferior (INF), or NULL if |
| 261 | the list could not be computed. |
| 262 | |
| 263 | Cache the result in per-inferior data, so as to avoid recomputing it |
| 264 | each time this function is called. |
| 265 | |
| 266 | If an error occurs while computing this list, and WARNING_MSG |
| 267 | is not NULL, then print a warning including WARNING_MSG and |
| 268 | a description of the error. */ |
| 269 | |
| 270 | static VEC (lm_info_aix_p) * |
| 271 | solib_aix_get_library_list (struct inferior *inf, const char *warning_msg) |
| 272 | { |
| 273 | struct solib_aix_inferior_data *data; |
| 274 | char *library_document; |
| 275 | struct cleanup *cleanup; |
| 276 | |
| 277 | /* If already computed, return the cached value. */ |
| 278 | data = get_solib_aix_inferior_data (inf); |
| 279 | if (data->library_list != NULL) |
| 280 | return data->library_list; |
| 281 | |
| 282 | library_document = target_read_stralloc (¤t_target, |
| 283 | TARGET_OBJECT_LIBRARIES_AIX, |
| 284 | NULL); |
| 285 | if (library_document == NULL && warning_msg != NULL) |
| 286 | { |
| 287 | warning (_("%s (failed to read TARGET_OBJECT_LIBRARIES_AIX)"), |
| 288 | warning_msg); |
| 289 | return NULL; |
| 290 | } |
| 291 | cleanup = make_cleanup (xfree, library_document); |
| 292 | |
| 293 | if (solib_aix_debug) |
| 294 | fprintf_unfiltered (gdb_stdlog, |
| 295 | "DEBUG: TARGET_OBJECT_LIBRARIES_AIX = \n%s\n", |
| 296 | library_document); |
| 297 | |
| 298 | data->library_list = solib_aix_parse_libraries (library_document); |
| 299 | if (data->library_list == NULL && warning_msg != NULL) |
| 300 | { |
| 301 | warning (_("%s (missing XML support?)"), warning_msg); |
| 302 | do_cleanups (cleanup); |
| 303 | return NULL; |
| 304 | } |
| 305 | |
| 306 | do_cleanups (cleanup); |
| 307 | return data->library_list; |
| 308 | } |
| 309 | |
| 310 | /* If the .bss section's VMA is set to an address located before |
| 311 | the end of the .data section, causing the two sections to overlap, |
| 312 | return the overlap in bytes. Otherwise, return zero. |
| 313 | |
| 314 | Motivation: |
| 315 | |
| 316 | The GNU linker sometimes sets the start address of the .bss session |
| 317 | before the end of the .data section, making the 2 sections overlap. |
| 318 | The loader appears to handle this situation gracefully, by simply |
| 319 | loading the bss section right after the end of the .data section. |
| 320 | |
| 321 | This means that the .data and the .bss sections are sometimes |
| 322 | no longer relocated by the same amount. The problem is that |
| 323 | the ldinfo data does not contain any information regarding |
| 324 | the relocation of the .bss section, assuming that it would be |
| 325 | identical to the information provided for the .data section |
| 326 | (this is what would normally happen if the program was linked |
| 327 | correctly). |
| 328 | |
| 329 | GDB therefore needs to detect those cases, and make the corresponding |
| 330 | adjustment to the .bss section offset computed from the ldinfo data |
| 331 | when necessary. This function returns the adjustment amount (or |
| 332 | zero when no adjustment is needed). */ |
| 333 | |
| 334 | static CORE_ADDR |
| 335 | solib_aix_bss_data_overlap (bfd *abfd) |
| 336 | { |
| 337 | struct bfd_section *data_sect, *bss_sect; |
| 338 | |
| 339 | data_sect = bfd_get_section_by_name (abfd, ".data"); |
| 340 | if (data_sect == NULL) |
| 341 | return 0; /* No overlap possible. */ |
| 342 | |
| 343 | bss_sect = bfd_get_section_by_name (abfd, ".bss"); |
| 344 | if (bss_sect == NULL) |
| 345 | return 0; /* No overlap possible. */ |
| 346 | |
| 347 | /* Assume the problem only occurs with linkers that place the .bss |
| 348 | section after the .data section (the problem has only been |
| 349 | observed when using the GNU linker, and the default linker |
| 350 | script always places the .data and .bss sections in that order). */ |
| 351 | if (bfd_section_vma (abfd, bss_sect) |
| 352 | < bfd_section_vma (abfd, data_sect)) |
| 353 | return 0; |
| 354 | |
| 355 | if (bfd_section_vma (abfd, bss_sect) |
| 356 | < bfd_section_vma (abfd, data_sect) + bfd_get_section_size (data_sect)) |
| 357 | return ((bfd_section_vma (abfd, data_sect) |
| 358 | + bfd_get_section_size (data_sect)) |
| 359 | - bfd_section_vma (abfd, bss_sect)); |
| 360 | |
| 361 | return 0; |
| 362 | } |
| 363 | |
| 364 | /* Implement the "relocate_section_addresses" target_so_ops method. */ |
| 365 | |
| 366 | static void |
| 367 | solib_aix_relocate_section_addresses (struct so_list *so, |
| 368 | struct target_section *sec) |
| 369 | { |
| 370 | struct bfd_section *bfd_sect = sec->the_bfd_section; |
| 371 | bfd *abfd = bfd_sect->owner; |
| 372 | const char *section_name = bfd_section_name (abfd, bfd_sect); |
| 373 | lm_info_aix *info = (lm_info_aix *) so->lm_info; |
| 374 | |
| 375 | if (strcmp (section_name, ".text") == 0) |
| 376 | { |
| 377 | sec->addr = info->text_addr; |
| 378 | sec->endaddr = sec->addr + info->text_size; |
| 379 | |
| 380 | /* The text address given to us by the loader contains |
| 381 | XCOFF headers, so we need to adjust by this much. */ |
| 382 | sec->addr += bfd_sect->filepos; |
| 383 | } |
| 384 | else if (strcmp (section_name, ".data") == 0) |
| 385 | { |
| 386 | sec->addr = info->data_addr; |
| 387 | sec->endaddr = sec->addr + info->data_size; |
| 388 | } |
| 389 | else if (strcmp (section_name, ".bss") == 0) |
| 390 | { |
| 391 | /* The information provided by the loader does not include |
| 392 | the address of the .bss section, but we know that it gets |
| 393 | relocated by the same offset as the .data section. So, |
| 394 | compute the relocation offset for the .data section, and |
| 395 | apply it to the .bss section as well. If the .data section |
| 396 | is not defined (which seems highly unlikely), do our best |
| 397 | by assuming no relocation. */ |
| 398 | struct bfd_section *data_sect |
| 399 | = bfd_get_section_by_name (abfd, ".data"); |
| 400 | CORE_ADDR data_offset = 0; |
| 401 | |
| 402 | if (data_sect != NULL) |
| 403 | data_offset = info->data_addr - bfd_section_vma (abfd, data_sect); |
| 404 | |
| 405 | sec->addr = bfd_section_vma (abfd, bfd_sect) + data_offset; |
| 406 | sec->addr += solib_aix_bss_data_overlap (abfd); |
| 407 | sec->endaddr = sec->addr + bfd_section_size (abfd, bfd_sect); |
| 408 | } |
| 409 | else |
| 410 | { |
| 411 | /* All other sections should not be relocated. */ |
| 412 | sec->addr = bfd_section_vma (abfd, bfd_sect); |
| 413 | sec->endaddr = sec->addr + bfd_section_size (abfd, bfd_sect); |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | /* Implement the "free_so" target_so_ops method. */ |
| 418 | |
| 419 | static void |
| 420 | solib_aix_free_so (struct so_list *so) |
| 421 | { |
| 422 | lm_info_aix *li = (lm_info_aix *) so->lm_info; |
| 423 | |
| 424 | if (solib_aix_debug) |
| 425 | fprintf_unfiltered (gdb_stdlog, "DEBUG: solib_aix_free_so (%s)\n", |
| 426 | so->so_name); |
| 427 | |
| 428 | delete li; |
| 429 | } |
| 430 | |
| 431 | /* Implement the "clear_solib" target_so_ops method. */ |
| 432 | |
| 433 | static void |
| 434 | solib_aix_clear_solib (void) |
| 435 | { |
| 436 | /* Nothing needed. */ |
| 437 | } |
| 438 | |
| 439 | /* Compute and return the OBJFILE's section_offset array, using |
| 440 | the associated loader info (INFO). |
| 441 | |
| 442 | The resulting array is computed on the heap and must be |
| 443 | deallocated after use. */ |
| 444 | |
| 445 | static struct section_offsets * |
| 446 | solib_aix_get_section_offsets (struct objfile *objfile, |
| 447 | lm_info_aix *info) |
| 448 | { |
| 449 | struct section_offsets *offsets; |
| 450 | bfd *abfd = objfile->obfd; |
| 451 | |
| 452 | offsets = XCNEWVEC (struct section_offsets, objfile->num_sections); |
| 453 | |
| 454 | /* .text */ |
| 455 | |
| 456 | if (objfile->sect_index_text != -1) |
| 457 | { |
| 458 | struct bfd_section *sect |
| 459 | = objfile->sections[objfile->sect_index_text].the_bfd_section; |
| 460 | |
| 461 | offsets->offsets[objfile->sect_index_text] |
| 462 | = info->text_addr + sect->filepos - bfd_section_vma (abfd, sect); |
| 463 | } |
| 464 | |
| 465 | /* .data */ |
| 466 | |
| 467 | if (objfile->sect_index_data != -1) |
| 468 | { |
| 469 | struct bfd_section *sect |
| 470 | = objfile->sections[objfile->sect_index_data].the_bfd_section; |
| 471 | |
| 472 | offsets->offsets[objfile->sect_index_data] |
| 473 | = info->data_addr - bfd_section_vma (abfd, sect); |
| 474 | } |
| 475 | |
| 476 | /* .bss |
| 477 | |
| 478 | The offset of the .bss section should be identical to the offset |
| 479 | of the .data section. If no .data section (which seems hard to |
| 480 | believe it is possible), assume it is zero. */ |
| 481 | |
| 482 | if (objfile->sect_index_bss != -1 |
| 483 | && objfile->sect_index_data != -1) |
| 484 | { |
| 485 | offsets->offsets[objfile->sect_index_bss] |
| 486 | = (offsets->offsets[objfile->sect_index_data] |
| 487 | + solib_aix_bss_data_overlap (abfd)); |
| 488 | } |
| 489 | |
| 490 | /* All other sections should not need relocation. */ |
| 491 | |
| 492 | return offsets; |
| 493 | } |
| 494 | |
| 495 | /* Implement the "solib_create_inferior_hook" target_so_ops method. */ |
| 496 | |
| 497 | static void |
| 498 | solib_aix_solib_create_inferior_hook (int from_tty) |
| 499 | { |
| 500 | const char *warning_msg = "unable to relocate main executable"; |
| 501 | VEC (lm_info_aix_p) *library_list; |
| 502 | lm_info_aix *exec_info; |
| 503 | |
| 504 | /* We need to relocate the main executable... */ |
| 505 | |
| 506 | library_list = solib_aix_get_library_list (current_inferior (), |
| 507 | warning_msg); |
| 508 | if (library_list == NULL) |
| 509 | return; /* Warning already printed. */ |
| 510 | |
| 511 | if (VEC_length (lm_info_aix_p, library_list) < 1) |
| 512 | { |
| 513 | warning (_("unable to relocate main executable (no info from loader)")); |
| 514 | return; |
| 515 | } |
| 516 | |
| 517 | exec_info = VEC_index (lm_info_aix_p, library_list, 0); |
| 518 | |
| 519 | if (symfile_objfile != NULL) |
| 520 | { |
| 521 | struct section_offsets *offsets |
| 522 | = solib_aix_get_section_offsets (symfile_objfile, exec_info); |
| 523 | struct cleanup *cleanup = make_cleanup (xfree, offsets); |
| 524 | |
| 525 | objfile_relocate (symfile_objfile, offsets); |
| 526 | do_cleanups (cleanup); |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | /* Implement the "current_sos" target_so_ops method. */ |
| 531 | |
| 532 | static struct so_list * |
| 533 | solib_aix_current_sos (void) |
| 534 | { |
| 535 | struct so_list *start = NULL, *last = NULL; |
| 536 | VEC (lm_info_aix_p) *library_list; |
| 537 | lm_info_aix *info; |
| 538 | int ix; |
| 539 | |
| 540 | library_list = solib_aix_get_library_list (current_inferior (), NULL); |
| 541 | if (library_list == NULL) |
| 542 | return NULL; |
| 543 | |
| 544 | /* Build a struct so_list for each entry on the list. |
| 545 | We skip the first entry, since this is the entry corresponding |
| 546 | to the main executable, not a shared library. */ |
| 547 | for (ix = 1; VEC_iterate (lm_info_aix_p, library_list, ix, info); ix++) |
| 548 | { |
| 549 | struct so_list *new_solib = XCNEW (struct so_list); |
| 550 | std::string so_name; |
| 551 | |
| 552 | if (info->member_name.empty ()) |
| 553 | { |
| 554 | /* INFO->FILENAME is probably not an archive, but rather |
| 555 | a shared object. Unusual, but it should be possible |
| 556 | to link a program against a shared object directory, |
| 557 | without having to put it in an archive first. */ |
| 558 | so_name = info->filename; |
| 559 | } |
| 560 | else |
| 561 | { |
| 562 | /* This is the usual case on AIX, where the shared object |
| 563 | is a member of an archive. Create a synthetic so_name |
| 564 | that follows the same convention as AIX's ldd tool |
| 565 | (Eg: "/lib/libc.a(shr.o)"). */ |
| 566 | so_name = string_printf ("%s(%s)", info->filename.c_str (), |
| 567 | info->member_name.c_str ()); |
| 568 | } |
| 569 | strncpy (new_solib->so_original_name, so_name.c_str (), |
| 570 | SO_NAME_MAX_PATH_SIZE - 1); |
| 571 | new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
| 572 | memcpy (new_solib->so_name, new_solib->so_original_name, |
| 573 | SO_NAME_MAX_PATH_SIZE); |
| 574 | new_solib->lm_info = new lm_info_aix (*info); |
| 575 | |
| 576 | /* Add it to the list. */ |
| 577 | if (!start) |
| 578 | last = start = new_solib; |
| 579 | else |
| 580 | { |
| 581 | last->next = new_solib; |
| 582 | last = new_solib; |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | return start; |
| 587 | } |
| 588 | |
| 589 | /* Implement the "open_symbol_file_object" target_so_ops method. */ |
| 590 | |
| 591 | static int |
| 592 | solib_aix_open_symbol_file_object (int from_tty) |
| 593 | { |
| 594 | return 0; |
| 595 | } |
| 596 | |
| 597 | /* Implement the "in_dynsym_resolve_code" target_so_ops method. */ |
| 598 | |
| 599 | static int |
| 600 | solib_aix_in_dynsym_resolve_code (CORE_ADDR pc) |
| 601 | { |
| 602 | return 0; |
| 603 | } |
| 604 | |
| 605 | /* Implement the "bfd_open" target_so_ops method. */ |
| 606 | |
| 607 | static gdb_bfd_ref_ptr |
| 608 | solib_aix_bfd_open (char *pathname) |
| 609 | { |
| 610 | /* The pathname is actually a synthetic filename with the following |
| 611 | form: "/path/to/sharedlib(member.o)" (double-quotes excluded). |
| 612 | split this into archive name and member name. |
| 613 | |
| 614 | FIXME: This is a little hacky. Perhaps we should provide access |
| 615 | to the solib's lm_info here? */ |
| 616 | const int path_len = strlen (pathname); |
| 617 | char *sep; |
| 618 | int filename_len; |
| 619 | int found_file; |
| 620 | char *found_pathname; |
| 621 | |
| 622 | if (pathname[path_len - 1] != ')') |
| 623 | return solib_bfd_open (pathname); |
| 624 | |
| 625 | /* Search for the associated parens. */ |
| 626 | sep = strrchr (pathname, '('); |
| 627 | if (sep == NULL) |
| 628 | { |
| 629 | /* Should never happen, but recover as best as we can (trying |
| 630 | to open pathname without decoding, possibly leading to |
| 631 | a failure), rather than triggering an assert failure). */ |
| 632 | warning (_("missing '(' in shared object pathname: %s"), pathname); |
| 633 | return solib_bfd_open (pathname); |
| 634 | } |
| 635 | filename_len = sep - pathname; |
| 636 | |
| 637 | std::string filename (string_printf ("%.*s", filename_len, pathname)); |
| 638 | std::string member_name (string_printf ("%.*s", path_len - filename_len - 2, |
| 639 | sep + 1)); |
| 640 | |
| 641 | /* Calling solib_find makes certain that sysroot path is set properly |
| 642 | if program has a dependency on .a archive and sysroot is set via |
| 643 | set sysroot command. */ |
| 644 | found_pathname = solib_find (filename.c_str (), &found_file); |
| 645 | if (found_pathname == NULL) |
| 646 | perror_with_name (pathname); |
| 647 | gdb_bfd_ref_ptr archive_bfd (solib_bfd_fopen (found_pathname, found_file)); |
| 648 | if (archive_bfd == NULL) |
| 649 | { |
| 650 | warning (_("Could not open `%s' as an executable file: %s"), |
| 651 | filename.c_str (), bfd_errmsg (bfd_get_error ())); |
| 652 | return NULL; |
| 653 | } |
| 654 | |
| 655 | if (bfd_check_format (archive_bfd.get (), bfd_object)) |
| 656 | return archive_bfd; |
| 657 | |
| 658 | if (! bfd_check_format (archive_bfd.get (), bfd_archive)) |
| 659 | { |
| 660 | warning (_("\"%s\": not in executable format: %s."), |
| 661 | filename.c_str (), bfd_errmsg (bfd_get_error ())); |
| 662 | return NULL; |
| 663 | } |
| 664 | |
| 665 | gdb_bfd_ref_ptr object_bfd |
| 666 | (gdb_bfd_openr_next_archived_file (archive_bfd.get (), NULL)); |
| 667 | while (object_bfd != NULL) |
| 668 | { |
| 669 | if (member_name == object_bfd->filename) |
| 670 | break; |
| 671 | |
| 672 | object_bfd = gdb_bfd_openr_next_archived_file (archive_bfd.get (), |
| 673 | object_bfd.get ()); |
| 674 | } |
| 675 | |
| 676 | if (object_bfd == NULL) |
| 677 | { |
| 678 | warning (_("\"%s\": member \"%s\" missing."), filename.c_str (), |
| 679 | member_name.c_str ()); |
| 680 | return NULL; |
| 681 | } |
| 682 | |
| 683 | if (! bfd_check_format (object_bfd.get (), bfd_object)) |
| 684 | { |
| 685 | warning (_("%s(%s): not in object format: %s."), |
| 686 | filename.c_str (), member_name.c_str (), |
| 687 | bfd_errmsg (bfd_get_error ())); |
| 688 | return NULL; |
| 689 | } |
| 690 | |
| 691 | /* Override the returned bfd's name with the name returned from solib_find |
| 692 | along with appended parenthesized member name in order to allow commands |
| 693 | listing all shared libraries to display. Otherwise, we would only be |
| 694 | displaying the name of the archive member object. */ |
| 695 | xfree (bfd_get_filename (object_bfd.get ())); |
| 696 | object_bfd->filename = xstrprintf ("%s%s", |
| 697 | bfd_get_filename (archive_bfd.get ()), |
| 698 | sep); |
| 699 | |
| 700 | return object_bfd; |
| 701 | } |
| 702 | |
| 703 | /* Return the obj_section corresponding to OBJFILE's data section, |
| 704 | or NULL if not found. */ |
| 705 | /* FIXME: Define in a more general location? */ |
| 706 | |
| 707 | static struct obj_section * |
| 708 | data_obj_section_from_objfile (struct objfile *objfile) |
| 709 | { |
| 710 | struct obj_section *osect; |
| 711 | |
| 712 | ALL_OBJFILE_OSECTIONS (objfile, osect) |
| 713 | if (strcmp (bfd_section_name (objfile->obfd, osect->the_bfd_section), |
| 714 | ".data") == 0) |
| 715 | return osect; |
| 716 | |
| 717 | return NULL; |
| 718 | } |
| 719 | |
| 720 | /* Return the TOC value corresponding to the given PC address, |
| 721 | or raise an error if the value could not be determined. */ |
| 722 | |
| 723 | CORE_ADDR |
| 724 | solib_aix_get_toc_value (CORE_ADDR pc) |
| 725 | { |
| 726 | struct obj_section *pc_osect = find_pc_section (pc); |
| 727 | struct obj_section *data_osect; |
| 728 | CORE_ADDR result; |
| 729 | |
| 730 | if (pc_osect == NULL) |
| 731 | error (_("unable to find TOC entry for pc %s " |
| 732 | "(no section contains this PC)"), |
| 733 | core_addr_to_string (pc)); |
| 734 | |
| 735 | data_osect = data_obj_section_from_objfile (pc_osect->objfile); |
| 736 | if (data_osect == NULL) |
| 737 | error (_("unable to find TOC entry for pc %s " |
| 738 | "(%s has no data section)"), |
| 739 | core_addr_to_string (pc), objfile_name (pc_osect->objfile)); |
| 740 | |
| 741 | result = (obj_section_addr (data_osect) |
| 742 | + xcoff_get_toc_offset (pc_osect->objfile)); |
| 743 | if (solib_aix_debug) |
| 744 | fprintf_unfiltered (gdb_stdlog, |
| 745 | "DEBUG: solib_aix_get_toc_value (pc=%s) -> %s\n", |
| 746 | core_addr_to_string (pc), |
| 747 | core_addr_to_string (result)); |
| 748 | |
| 749 | return result; |
| 750 | } |
| 751 | |
| 752 | /* This module's normal_stop observer. */ |
| 753 | |
| 754 | static void |
| 755 | solib_aix_normal_stop_observer (struct bpstats *unused_1, int unused_2) |
| 756 | { |
| 757 | struct solib_aix_inferior_data *data |
| 758 | = get_solib_aix_inferior_data (current_inferior ()); |
| 759 | |
| 760 | /* The inferior execution has been resumed, and it just stopped |
| 761 | again. This means that the list of shared libraries may have |
| 762 | evolved. Reset our cached value. */ |
| 763 | solib_aix_free_library_list (&data->library_list); |
| 764 | } |
| 765 | |
| 766 | /* Implements the "show debug aix-solib" command. */ |
| 767 | |
| 768 | static void |
| 769 | show_solib_aix_debug (struct ui_file *file, int from_tty, |
| 770 | struct cmd_list_element *c, const char *value) |
| 771 | { |
| 772 | fprintf_filtered (file, _("solib-aix debugging is %s.\n"), value); |
| 773 | } |
| 774 | |
| 775 | /* The target_so_ops for AIX targets. */ |
| 776 | struct target_so_ops solib_aix_so_ops; |
| 777 | |
| 778 | void |
| 779 | _initialize_solib_aix (void) |
| 780 | { |
| 781 | solib_aix_so_ops.relocate_section_addresses |
| 782 | = solib_aix_relocate_section_addresses; |
| 783 | solib_aix_so_ops.free_so = solib_aix_free_so; |
| 784 | solib_aix_so_ops.clear_solib = solib_aix_clear_solib; |
| 785 | solib_aix_so_ops.solib_create_inferior_hook |
| 786 | = solib_aix_solib_create_inferior_hook; |
| 787 | solib_aix_so_ops.current_sos = solib_aix_current_sos; |
| 788 | solib_aix_so_ops.open_symbol_file_object |
| 789 | = solib_aix_open_symbol_file_object; |
| 790 | solib_aix_so_ops.in_dynsym_resolve_code |
| 791 | = solib_aix_in_dynsym_resolve_code; |
| 792 | solib_aix_so_ops.bfd_open = solib_aix_bfd_open; |
| 793 | |
| 794 | solib_aix_inferior_data_handle = register_inferior_data (); |
| 795 | |
| 796 | observer_attach_normal_stop (solib_aix_normal_stop_observer); |
| 797 | |
| 798 | /* Debug this file's internals. */ |
| 799 | add_setshow_boolean_cmd ("aix-solib", class_maintenance, |
| 800 | &solib_aix_debug, _("\ |
| 801 | Control the debugging traces for the solib-aix module."), _("\ |
| 802 | Show whether solib-aix debugging traces are enabled."), _("\ |
| 803 | When on, solib-aix debugging traces are enabled."), |
| 804 | NULL, |
| 805 | show_solib_aix_debug, |
| 806 | &setdebuglist, &showdebuglist); |
| 807 | } |