| 1 | /* Handle shared libraries for GDB, the GNU Debugger. |
| 2 | |
| 3 | Copyright (C) 1990-2003, 2005-2012 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 | |
| 22 | #include <sys/types.h> |
| 23 | #include <fcntl.h> |
| 24 | #include "gdb_string.h" |
| 25 | #include "symtab.h" |
| 26 | #include "bfd.h" |
| 27 | #include "symfile.h" |
| 28 | #include "objfiles.h" |
| 29 | #include "exceptions.h" |
| 30 | #include "gdbcore.h" |
| 31 | #include "command.h" |
| 32 | #include "target.h" |
| 33 | #include "frame.h" |
| 34 | #include "gdb_regex.h" |
| 35 | #include "inferior.h" |
| 36 | #include "environ.h" |
| 37 | #include "language.h" |
| 38 | #include "gdbcmd.h" |
| 39 | #include "completer.h" |
| 40 | #include "filenames.h" /* for DOSish file names */ |
| 41 | #include "exec.h" |
| 42 | #include "solist.h" |
| 43 | #include "observer.h" |
| 44 | #include "readline/readline.h" |
| 45 | #include "remote.h" |
| 46 | #include "solib.h" |
| 47 | #include "interps.h" |
| 48 | #include "filesystem.h" |
| 49 | #include "gdb_bfd.h" |
| 50 | |
| 51 | /* Architecture-specific operations. */ |
| 52 | |
| 53 | /* Per-architecture data key. */ |
| 54 | static struct gdbarch_data *solib_data; |
| 55 | |
| 56 | static void * |
| 57 | solib_init (struct obstack *obstack) |
| 58 | { |
| 59 | struct target_so_ops **ops; |
| 60 | |
| 61 | ops = OBSTACK_ZALLOC (obstack, struct target_so_ops *); |
| 62 | *ops = current_target_so_ops; |
| 63 | return ops; |
| 64 | } |
| 65 | |
| 66 | static struct target_so_ops * |
| 67 | solib_ops (struct gdbarch *gdbarch) |
| 68 | { |
| 69 | struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data); |
| 70 | |
| 71 | return *ops; |
| 72 | } |
| 73 | |
| 74 | /* Set the solib operations for GDBARCH to NEW_OPS. */ |
| 75 | |
| 76 | void |
| 77 | set_solib_ops (struct gdbarch *gdbarch, struct target_so_ops *new_ops) |
| 78 | { |
| 79 | struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data); |
| 80 | |
| 81 | *ops = new_ops; |
| 82 | } |
| 83 | \f |
| 84 | |
| 85 | /* external data declarations */ |
| 86 | |
| 87 | /* FIXME: gdbarch needs to control this variable, or else every |
| 88 | configuration needs to call set_solib_ops. */ |
| 89 | struct target_so_ops *current_target_so_ops; |
| 90 | |
| 91 | /* List of known shared objects */ |
| 92 | #define so_list_head current_program_space->so_list |
| 93 | |
| 94 | /* Local function prototypes */ |
| 95 | |
| 96 | /* If non-empty, this is a search path for loading non-absolute shared library |
| 97 | symbol files. This takes precedence over the environment variables PATH |
| 98 | and LD_LIBRARY_PATH. */ |
| 99 | static char *solib_search_path = NULL; |
| 100 | static void |
| 101 | show_solib_search_path (struct ui_file *file, int from_tty, |
| 102 | struct cmd_list_element *c, const char *value) |
| 103 | { |
| 104 | fprintf_filtered (file, _("The search path for loading non-absolute " |
| 105 | "shared library symbol files is %s.\n"), |
| 106 | value); |
| 107 | } |
| 108 | |
| 109 | /* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */ |
| 110 | #if (HAVE_DOS_BASED_FILE_SYSTEM) |
| 111 | # define DOS_BASED_FILE_SYSTEM 1 |
| 112 | #else |
| 113 | # define DOS_BASED_FILE_SYSTEM 0 |
| 114 | #endif |
| 115 | |
| 116 | /* Returns the full pathname of the shared library file, or NULL if |
| 117 | not found. (The pathname is malloc'ed; it needs to be freed by the |
| 118 | caller.) *FD is set to either -1 or an open file handle for the |
| 119 | library. |
| 120 | |
| 121 | Global variable GDB_SYSROOT is used as a prefix directory |
| 122 | to search for shared libraries if they have an absolute path. |
| 123 | |
| 124 | Global variable SOLIB_SEARCH_PATH is used as a prefix directory |
| 125 | (or set of directories, as in LD_LIBRARY_PATH) to search for all |
| 126 | shared libraries if not found in GDB_SYSROOT. |
| 127 | |
| 128 | Search algorithm: |
| 129 | * If there is a gdb_sysroot and path is absolute: |
| 130 | * Search for gdb_sysroot/path. |
| 131 | * else |
| 132 | * Look for it literally (unmodified). |
| 133 | * Look in SOLIB_SEARCH_PATH. |
| 134 | * If available, use target defined search function. |
| 135 | * If gdb_sysroot is NOT set, perform the following two searches: |
| 136 | * Look in inferior's $PATH. |
| 137 | * Look in inferior's $LD_LIBRARY_PATH. |
| 138 | * |
| 139 | * The last check avoids doing this search when targetting remote |
| 140 | * machines since gdb_sysroot will almost always be set. |
| 141 | */ |
| 142 | |
| 143 | char * |
| 144 | solib_find (char *in_pathname, int *fd) |
| 145 | { |
| 146 | struct target_so_ops *ops = solib_ops (target_gdbarch ()); |
| 147 | int found_file = -1; |
| 148 | char *temp_pathname = NULL; |
| 149 | int gdb_sysroot_is_empty; |
| 150 | const char *solib_symbols_extension |
| 151 | = gdbarch_solib_symbols_extension (target_gdbarch ()); |
| 152 | const char *fskind = effective_target_file_system_kind (); |
| 153 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
| 154 | char *sysroot = NULL; |
| 155 | |
| 156 | /* If solib_symbols_extension is set, replace the file's |
| 157 | extension. */ |
| 158 | if (solib_symbols_extension) |
| 159 | { |
| 160 | char *p = in_pathname + strlen (in_pathname); |
| 161 | |
| 162 | while (p > in_pathname && *p != '.') |
| 163 | p--; |
| 164 | |
| 165 | if (*p == '.') |
| 166 | { |
| 167 | char *new_pathname; |
| 168 | |
| 169 | new_pathname = alloca (p - in_pathname + 1 |
| 170 | + strlen (solib_symbols_extension) + 1); |
| 171 | memcpy (new_pathname, in_pathname, p - in_pathname + 1); |
| 172 | strcpy (new_pathname + (p - in_pathname) + 1, |
| 173 | solib_symbols_extension); |
| 174 | |
| 175 | in_pathname = new_pathname; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | gdb_sysroot_is_empty = (gdb_sysroot == NULL || *gdb_sysroot == 0); |
| 180 | |
| 181 | if (!gdb_sysroot_is_empty) |
| 182 | { |
| 183 | int prefix_len = strlen (gdb_sysroot); |
| 184 | |
| 185 | /* Remove trailing slashes from absolute prefix. */ |
| 186 | while (prefix_len > 0 |
| 187 | && IS_DIR_SEPARATOR (gdb_sysroot[prefix_len - 1])) |
| 188 | prefix_len--; |
| 189 | |
| 190 | sysroot = savestring (gdb_sysroot, prefix_len); |
| 191 | make_cleanup (xfree, sysroot); |
| 192 | } |
| 193 | |
| 194 | /* If we're on a non-DOS-based system, backslashes won't be |
| 195 | understood as directory separator, so, convert them to forward |
| 196 | slashes, iff we're supposed to handle DOS-based file system |
| 197 | semantics for target paths. */ |
| 198 | if (!DOS_BASED_FILE_SYSTEM && fskind == file_system_kind_dos_based) |
| 199 | { |
| 200 | char *p; |
| 201 | |
| 202 | /* Avoid clobbering our input. */ |
| 203 | p = alloca (strlen (in_pathname) + 1); |
| 204 | strcpy (p, in_pathname); |
| 205 | in_pathname = p; |
| 206 | |
| 207 | for (; *p; p++) |
| 208 | { |
| 209 | if (*p == '\\') |
| 210 | *p = '/'; |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | /* Note, we're interested in IS_TARGET_ABSOLUTE_PATH, not |
| 215 | IS_ABSOLUTE_PATH. The latter is for host paths only, while |
| 216 | IN_PATHNAME is a target path. For example, if we're supposed to |
| 217 | be handling DOS-like semantics we want to consider a |
| 218 | 'c:/foo/bar.dll' path as an absolute path, even on a Unix box. |
| 219 | With such a path, before giving up on the sysroot, we'll try: |
| 220 | |
| 221 | 1st attempt, c:/foo/bar.dll ==> /sysroot/c:/foo/bar.dll |
| 222 | 2nd attempt, c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll |
| 223 | 3rd attempt, c:/foo/bar.dll ==> /sysroot/foo/bar.dll |
| 224 | */ |
| 225 | |
| 226 | if (!IS_TARGET_ABSOLUTE_PATH (fskind, in_pathname) || gdb_sysroot_is_empty) |
| 227 | temp_pathname = xstrdup (in_pathname); |
| 228 | else |
| 229 | { |
| 230 | int need_dir_separator; |
| 231 | |
| 232 | need_dir_separator = !IS_DIR_SEPARATOR (in_pathname[0]); |
| 233 | |
| 234 | /* Cat the prefixed pathname together. */ |
| 235 | temp_pathname = concat (sysroot, |
| 236 | need_dir_separator ? SLASH_STRING : "", |
| 237 | in_pathname, (char *) NULL); |
| 238 | } |
| 239 | |
| 240 | /* Handle remote files. */ |
| 241 | if (remote_filename_p (temp_pathname)) |
| 242 | { |
| 243 | *fd = -1; |
| 244 | do_cleanups (old_chain); |
| 245 | return temp_pathname; |
| 246 | } |
| 247 | |
| 248 | /* Now see if we can open it. */ |
| 249 | found_file = open (temp_pathname, O_RDONLY | O_BINARY, 0); |
| 250 | if (found_file < 0) |
| 251 | xfree (temp_pathname); |
| 252 | |
| 253 | /* If the search in gdb_sysroot failed, and the path name has a |
| 254 | drive spec (e.g, c:/foo), try stripping ':' from the drive spec, |
| 255 | and retrying in the sysroot: |
| 256 | c:/foo/bar.dll ==> /sysroot/c/foo/bar.dll. */ |
| 257 | |
| 258 | if (found_file < 0 |
| 259 | && !gdb_sysroot_is_empty |
| 260 | && HAS_TARGET_DRIVE_SPEC (fskind, in_pathname)) |
| 261 | { |
| 262 | int need_dir_separator = !IS_DIR_SEPARATOR (in_pathname[2]); |
| 263 | char *drive = savestring (in_pathname, 1); |
| 264 | |
| 265 | temp_pathname = concat (sysroot, |
| 266 | SLASH_STRING, |
| 267 | drive, |
| 268 | need_dir_separator ? SLASH_STRING : "", |
| 269 | in_pathname + 2, (char *) NULL); |
| 270 | xfree (drive); |
| 271 | |
| 272 | found_file = open (temp_pathname, O_RDONLY | O_BINARY, 0); |
| 273 | if (found_file < 0) |
| 274 | { |
| 275 | xfree (temp_pathname); |
| 276 | |
| 277 | /* If the search in gdb_sysroot still failed, try fully |
| 278 | stripping the drive spec, and trying once more in the |
| 279 | sysroot before giving up. |
| 280 | |
| 281 | c:/foo/bar.dll ==> /sysroot/foo/bar.dll. */ |
| 282 | |
| 283 | temp_pathname = concat (sysroot, |
| 284 | need_dir_separator ? SLASH_STRING : "", |
| 285 | in_pathname + 2, (char *) NULL); |
| 286 | |
| 287 | found_file = open (temp_pathname, O_RDONLY | O_BINARY, 0); |
| 288 | if (found_file < 0) |
| 289 | xfree (temp_pathname); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | do_cleanups (old_chain); |
| 294 | |
| 295 | /* We try to find the library in various ways. After each attempt, |
| 296 | either found_file >= 0 and temp_pathname is a malloc'd string, or |
| 297 | found_file < 0 and temp_pathname does not point to storage that |
| 298 | needs to be freed. */ |
| 299 | |
| 300 | if (found_file < 0) |
| 301 | temp_pathname = NULL; |
| 302 | |
| 303 | /* If the search in gdb_sysroot failed, and the path name is |
| 304 | absolute at this point, make it relative. (openp will try and open the |
| 305 | file according to its absolute path otherwise, which is not what we want.) |
| 306 | Affects subsequent searches for this solib. */ |
| 307 | if (found_file < 0 && IS_TARGET_ABSOLUTE_PATH (fskind, in_pathname)) |
| 308 | { |
| 309 | /* First, get rid of any drive letters etc. */ |
| 310 | while (!IS_TARGET_DIR_SEPARATOR (fskind, *in_pathname)) |
| 311 | in_pathname++; |
| 312 | |
| 313 | /* Next, get rid of all leading dir separators. */ |
| 314 | while (IS_TARGET_DIR_SEPARATOR (fskind, *in_pathname)) |
| 315 | in_pathname++; |
| 316 | } |
| 317 | |
| 318 | /* If not found, search the solib_search_path (if any). */ |
| 319 | if (found_file < 0 && solib_search_path != NULL) |
| 320 | found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST, |
| 321 | in_pathname, O_RDONLY | O_BINARY, &temp_pathname); |
| 322 | |
| 323 | /* If not found, next search the solib_search_path (if any) for the basename |
| 324 | only (ignoring the path). This is to allow reading solibs from a path |
| 325 | that differs from the opened path. */ |
| 326 | if (found_file < 0 && solib_search_path != NULL) |
| 327 | found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST, |
| 328 | target_lbasename (fskind, in_pathname), |
| 329 | O_RDONLY | O_BINARY, &temp_pathname); |
| 330 | |
| 331 | /* If not found, try to use target supplied solib search method. */ |
| 332 | if (found_file < 0 && ops->find_and_open_solib) |
| 333 | found_file = ops->find_and_open_solib (in_pathname, O_RDONLY | O_BINARY, |
| 334 | &temp_pathname); |
| 335 | |
| 336 | /* If not found, next search the inferior's $PATH environment variable. */ |
| 337 | if (found_file < 0 && gdb_sysroot_is_empty) |
| 338 | found_file = openp (get_in_environ (current_inferior ()->environment, |
| 339 | "PATH"), |
| 340 | OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY | O_BINARY, |
| 341 | &temp_pathname); |
| 342 | |
| 343 | /* If not found, next search the inferior's $LD_LIBRARY_PATH |
| 344 | environment variable. */ |
| 345 | if (found_file < 0 && gdb_sysroot_is_empty) |
| 346 | found_file = openp (get_in_environ (current_inferior ()->environment, |
| 347 | "LD_LIBRARY_PATH"), |
| 348 | OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY | O_BINARY, |
| 349 | &temp_pathname); |
| 350 | |
| 351 | *fd = found_file; |
| 352 | return temp_pathname; |
| 353 | } |
| 354 | |
| 355 | /* Open and return a BFD for the shared library PATHNAME. If FD is not -1, |
| 356 | it is used as file handle to open the file. Throws an error if the file |
| 357 | could not be opened. Handles both local and remote file access. |
| 358 | |
| 359 | PATHNAME must be malloc'ed by the caller. It will be freed by this |
| 360 | function. If unsuccessful, the FD will be closed (unless FD was |
| 361 | -1). */ |
| 362 | |
| 363 | bfd * |
| 364 | solib_bfd_fopen (char *pathname, int fd) |
| 365 | { |
| 366 | bfd *abfd; |
| 367 | |
| 368 | if (remote_filename_p (pathname)) |
| 369 | { |
| 370 | gdb_assert (fd == -1); |
| 371 | abfd = remote_bfd_open (pathname, gnutarget); |
| 372 | } |
| 373 | else |
| 374 | { |
| 375 | abfd = gdb_bfd_open (pathname, gnutarget, fd); |
| 376 | |
| 377 | if (abfd) |
| 378 | bfd_set_cacheable (abfd, 1); |
| 379 | } |
| 380 | |
| 381 | if (!abfd) |
| 382 | { |
| 383 | make_cleanup (xfree, pathname); |
| 384 | error (_("Could not open `%s' as an executable file: %s"), |
| 385 | pathname, bfd_errmsg (bfd_get_error ())); |
| 386 | } |
| 387 | |
| 388 | xfree (pathname); |
| 389 | |
| 390 | return abfd; |
| 391 | } |
| 392 | |
| 393 | /* Find shared library PATHNAME and open a BFD for it. */ |
| 394 | |
| 395 | bfd * |
| 396 | solib_bfd_open (char *pathname) |
| 397 | { |
| 398 | char *found_pathname; |
| 399 | int found_file; |
| 400 | bfd *abfd; |
| 401 | const struct bfd_arch_info *b; |
| 402 | |
| 403 | /* Search for shared library file. */ |
| 404 | found_pathname = solib_find (pathname, &found_file); |
| 405 | if (found_pathname == NULL) |
| 406 | { |
| 407 | /* Return failure if the file could not be found, so that we can |
| 408 | accumulate messages about missing libraries. */ |
| 409 | if (errno == ENOENT) |
| 410 | return NULL; |
| 411 | |
| 412 | perror_with_name (pathname); |
| 413 | } |
| 414 | |
| 415 | /* Open bfd for shared library. */ |
| 416 | abfd = solib_bfd_fopen (found_pathname, found_file); |
| 417 | |
| 418 | /* Check bfd format. */ |
| 419 | if (!bfd_check_format (abfd, bfd_object)) |
| 420 | { |
| 421 | make_cleanup_bfd_unref (abfd); |
| 422 | error (_("`%s': not in executable format: %s"), |
| 423 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
| 424 | } |
| 425 | |
| 426 | /* Check bfd arch. */ |
| 427 | b = gdbarch_bfd_arch_info (target_gdbarch ()); |
| 428 | if (!b->compatible (b, bfd_get_arch_info (abfd))) |
| 429 | warning (_("`%s': Shared library architecture %s is not compatible " |
| 430 | "with target architecture %s."), bfd_get_filename (abfd), |
| 431 | bfd_get_arch_info (abfd)->printable_name, b->printable_name); |
| 432 | |
| 433 | return abfd; |
| 434 | } |
| 435 | |
| 436 | /* Given a pointer to one of the shared objects in our list of mapped |
| 437 | objects, use the recorded name to open a bfd descriptor for the |
| 438 | object, build a section table, relocate all the section addresses |
| 439 | by the base address at which the shared object was mapped, and then |
| 440 | add the sections to the target's section table. |
| 441 | |
| 442 | FIXME: In most (all?) cases the shared object file name recorded in |
| 443 | the dynamic linkage tables will be a fully qualified pathname. For |
| 444 | cases where it isn't, do we really mimic the systems search |
| 445 | mechanism correctly in the below code (particularly the tilde |
| 446 | expansion stuff?). */ |
| 447 | |
| 448 | static int |
| 449 | solib_map_sections (struct so_list *so) |
| 450 | { |
| 451 | struct target_so_ops *ops = solib_ops (target_gdbarch ()); |
| 452 | char *filename; |
| 453 | struct target_section *p; |
| 454 | struct cleanup *old_chain; |
| 455 | bfd *abfd; |
| 456 | |
| 457 | filename = tilde_expand (so->so_name); |
| 458 | old_chain = make_cleanup (xfree, filename); |
| 459 | abfd = ops->bfd_open (filename); |
| 460 | do_cleanups (old_chain); |
| 461 | |
| 462 | if (abfd == NULL) |
| 463 | return 0; |
| 464 | |
| 465 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ |
| 466 | so->abfd = abfd; |
| 467 | |
| 468 | /* copy full path name into so_name, so that later symbol_file_add |
| 469 | can find it. */ |
| 470 | if (strlen (bfd_get_filename (abfd)) >= SO_NAME_MAX_PATH_SIZE) |
| 471 | error (_("Shared library file name is too long.")); |
| 472 | strcpy (so->so_name, bfd_get_filename (abfd)); |
| 473 | |
| 474 | if (build_section_table (abfd, &so->sections, &so->sections_end)) |
| 475 | { |
| 476 | error (_("Can't find the file sections in `%s': %s"), |
| 477 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
| 478 | } |
| 479 | |
| 480 | for (p = so->sections; p < so->sections_end; p++) |
| 481 | { |
| 482 | /* Relocate the section binding addresses as recorded in the shared |
| 483 | object's file by the base address to which the object was actually |
| 484 | mapped. */ |
| 485 | ops->relocate_section_addresses (so, p); |
| 486 | |
| 487 | /* If the target didn't provide information about the address |
| 488 | range of the shared object, assume we want the location of |
| 489 | the .text section. */ |
| 490 | if (so->addr_low == 0 && so->addr_high == 0 |
| 491 | && strcmp (p->the_bfd_section->name, ".text") == 0) |
| 492 | { |
| 493 | so->addr_low = p->addr; |
| 494 | so->addr_high = p->endaddr; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | /* Add the shared object's sections to the current set of file |
| 499 | section tables. Do this immediately after mapping the object so |
| 500 | that later nodes in the list can query this object, as is needed |
| 501 | in solib-osf.c. */ |
| 502 | add_target_sections (so, so->sections, so->sections_end); |
| 503 | |
| 504 | return 1; |
| 505 | } |
| 506 | |
| 507 | /* Free symbol-file related contents of SO. If we have opened a BFD |
| 508 | for SO, close it. If we have placed SO's sections in some target's |
| 509 | section table, the caller is responsible for removing them. |
| 510 | |
| 511 | This function doesn't mess with objfiles at all. If there is an |
| 512 | objfile associated with SO that needs to be removed, the caller is |
| 513 | responsible for taking care of that. */ |
| 514 | |
| 515 | static void |
| 516 | free_so_symbols (struct so_list *so) |
| 517 | { |
| 518 | if (so->sections) |
| 519 | { |
| 520 | xfree (so->sections); |
| 521 | so->sections = so->sections_end = NULL; |
| 522 | } |
| 523 | |
| 524 | gdb_bfd_unref (so->abfd); |
| 525 | so->abfd = NULL; |
| 526 | |
| 527 | /* Our caller closed the objfile, possibly via objfile_purge_solibs. */ |
| 528 | so->symbols_loaded = 0; |
| 529 | so->objfile = NULL; |
| 530 | |
| 531 | so->addr_low = so->addr_high = 0; |
| 532 | |
| 533 | /* Restore the target-supplied file name. SO_NAME may be the path |
| 534 | of the symbol file. */ |
| 535 | strcpy (so->so_name, so->so_original_name); |
| 536 | } |
| 537 | |
| 538 | /* Free the storage associated with the `struct so_list' object SO. |
| 539 | If we have opened a BFD for SO, close it. |
| 540 | |
| 541 | The caller is responsible for removing SO from whatever list it is |
| 542 | a member of. If we have placed SO's sections in some target's |
| 543 | section table, the caller is responsible for removing them. |
| 544 | |
| 545 | This function doesn't mess with objfiles at all. If there is an |
| 546 | objfile associated with SO that needs to be removed, the caller is |
| 547 | responsible for taking care of that. */ |
| 548 | |
| 549 | void |
| 550 | free_so (struct so_list *so) |
| 551 | { |
| 552 | struct target_so_ops *ops = solib_ops (target_gdbarch ()); |
| 553 | |
| 554 | free_so_symbols (so); |
| 555 | ops->free_so (so); |
| 556 | |
| 557 | xfree (so); |
| 558 | } |
| 559 | |
| 560 | |
| 561 | /* Return address of first so_list entry in master shared object list. */ |
| 562 | struct so_list * |
| 563 | master_so_list (void) |
| 564 | { |
| 565 | return so_list_head; |
| 566 | } |
| 567 | |
| 568 | /* Read in symbols for shared object SO. If SYMFILE_VERBOSE is set in FLAGS, |
| 569 | be chatty about it. Return non-zero if any symbols were actually |
| 570 | loaded. */ |
| 571 | |
| 572 | int |
| 573 | solib_read_symbols (struct so_list *so, int flags) |
| 574 | { |
| 575 | const int from_tty = flags & SYMFILE_VERBOSE; |
| 576 | |
| 577 | if (so->symbols_loaded) |
| 578 | { |
| 579 | /* If needed, we've already warned in our caller. */ |
| 580 | } |
| 581 | else if (so->abfd == NULL) |
| 582 | { |
| 583 | /* We've already warned about this library, when trying to open |
| 584 | it. */ |
| 585 | } |
| 586 | else |
| 587 | { |
| 588 | volatile struct gdb_exception e; |
| 589 | |
| 590 | flags |= current_inferior ()->symfile_flags; |
| 591 | |
| 592 | TRY_CATCH (e, RETURN_MASK_ERROR) |
| 593 | { |
| 594 | struct section_addr_info *sap; |
| 595 | |
| 596 | /* Have we already loaded this shared object? */ |
| 597 | ALL_OBJFILES (so->objfile) |
| 598 | { |
| 599 | if (filename_cmp (so->objfile->name, so->so_name) == 0 |
| 600 | && so->objfile->addr_low == so->addr_low) |
| 601 | break; |
| 602 | } |
| 603 | if (so->objfile != NULL) |
| 604 | break; |
| 605 | |
| 606 | sap = build_section_addr_info_from_section_table (so->sections, |
| 607 | so->sections_end); |
| 608 | so->objfile = symbol_file_add_from_bfd (so->abfd, |
| 609 | flags, sap, OBJF_SHARED, |
| 610 | NULL); |
| 611 | so->objfile->addr_low = so->addr_low; |
| 612 | free_section_addr_info (sap); |
| 613 | } |
| 614 | |
| 615 | if (e.reason < 0) |
| 616 | exception_fprintf (gdb_stderr, e, _("Error while reading shared" |
| 617 | " library symbols for %s:\n"), |
| 618 | so->so_name); |
| 619 | else |
| 620 | { |
| 621 | if (from_tty || info_verbose) |
| 622 | printf_unfiltered (_("Loaded symbols for %s\n"), so->so_name); |
| 623 | so->symbols_loaded = 1; |
| 624 | } |
| 625 | return 1; |
| 626 | } |
| 627 | |
| 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | /* Return 1 if KNOWN->objfile is used by any other so_list object in the |
| 632 | SO_LIST_HEAD list. Return 0 otherwise. */ |
| 633 | |
| 634 | static int |
| 635 | solib_used (const struct so_list *const known) |
| 636 | { |
| 637 | const struct so_list *pivot; |
| 638 | |
| 639 | for (pivot = so_list_head; pivot != NULL; pivot = pivot->next) |
| 640 | if (pivot != known && pivot->objfile == known->objfile) |
| 641 | return 1; |
| 642 | return 0; |
| 643 | } |
| 644 | |
| 645 | /* Synchronize GDB's shared object list with inferior's. |
| 646 | |
| 647 | Extract the list of currently loaded shared objects from the |
| 648 | inferior, and compare it with the list of shared objects currently |
| 649 | in GDB's so_list_head list. Edit so_list_head to bring it in sync |
| 650 | with the inferior's new list. |
| 651 | |
| 652 | If we notice that the inferior has unloaded some shared objects, |
| 653 | free any symbolic info GDB had read about those shared objects. |
| 654 | |
| 655 | Don't load symbolic info for any new shared objects; just add them |
| 656 | to the list, and leave their symbols_loaded flag clear. |
| 657 | |
| 658 | If FROM_TTY is non-null, feel free to print messages about what |
| 659 | we're doing. |
| 660 | |
| 661 | If TARGET is non-null, add the sections of all new shared objects |
| 662 | to TARGET's section table. Note that this doesn't remove any |
| 663 | sections for shared objects that have been unloaded, and it |
| 664 | doesn't check to see if the new shared objects are already present in |
| 665 | the section table. But we only use this for core files and |
| 666 | processes we've just attached to, so that's okay. */ |
| 667 | |
| 668 | static void |
| 669 | update_solib_list (int from_tty, struct target_ops *target) |
| 670 | { |
| 671 | struct target_so_ops *ops = solib_ops (target_gdbarch ()); |
| 672 | struct so_list *inferior = ops->current_sos(); |
| 673 | struct so_list *gdb, **gdb_link; |
| 674 | |
| 675 | /* We can reach here due to changing solib-search-path or the |
| 676 | sysroot, before having any inferior. */ |
| 677 | if (target_has_execution && !ptid_equal (inferior_ptid, null_ptid)) |
| 678 | { |
| 679 | struct inferior *inf = current_inferior (); |
| 680 | |
| 681 | /* If we are attaching to a running process for which we |
| 682 | have not opened a symbol file, we may be able to get its |
| 683 | symbols now! */ |
| 684 | if (inf->attach_flag && symfile_objfile == NULL) |
| 685 | catch_errors (ops->open_symbol_file_object, &from_tty, |
| 686 | "Error reading attached process's symbol file.\n", |
| 687 | RETURN_MASK_ALL); |
| 688 | } |
| 689 | |
| 690 | /* GDB and the inferior's dynamic linker each maintain their own |
| 691 | list of currently loaded shared objects; we want to bring the |
| 692 | former in sync with the latter. Scan both lists, seeing which |
| 693 | shared objects appear where. There are three cases: |
| 694 | |
| 695 | - A shared object appears on both lists. This means that GDB |
| 696 | knows about it already, and it's still loaded in the inferior. |
| 697 | Nothing needs to happen. |
| 698 | |
| 699 | - A shared object appears only on GDB's list. This means that |
| 700 | the inferior has unloaded it. We should remove the shared |
| 701 | object from GDB's tables. |
| 702 | |
| 703 | - A shared object appears only on the inferior's list. This |
| 704 | means that it's just been loaded. We should add it to GDB's |
| 705 | tables. |
| 706 | |
| 707 | So we walk GDB's list, checking each entry to see if it appears |
| 708 | in the inferior's list too. If it does, no action is needed, and |
| 709 | we remove it from the inferior's list. If it doesn't, the |
| 710 | inferior has unloaded it, and we remove it from GDB's list. By |
| 711 | the time we're done walking GDB's list, the inferior's list |
| 712 | contains only the new shared objects, which we then add. */ |
| 713 | |
| 714 | gdb = so_list_head; |
| 715 | gdb_link = &so_list_head; |
| 716 | while (gdb) |
| 717 | { |
| 718 | struct so_list *i = inferior; |
| 719 | struct so_list **i_link = &inferior; |
| 720 | |
| 721 | /* Check to see whether the shared object *gdb also appears in |
| 722 | the inferior's current list. */ |
| 723 | while (i) |
| 724 | { |
| 725 | if (ops->same) |
| 726 | { |
| 727 | if (ops->same (gdb, i)) |
| 728 | break; |
| 729 | } |
| 730 | else |
| 731 | { |
| 732 | if (! filename_cmp (gdb->so_original_name, i->so_original_name)) |
| 733 | break; |
| 734 | } |
| 735 | |
| 736 | i_link = &i->next; |
| 737 | i = *i_link; |
| 738 | } |
| 739 | |
| 740 | /* If the shared object appears on the inferior's list too, then |
| 741 | it's still loaded, so we don't need to do anything. Delete |
| 742 | it from the inferior's list, and leave it on GDB's list. */ |
| 743 | if (i) |
| 744 | { |
| 745 | *i_link = i->next; |
| 746 | free_so (i); |
| 747 | gdb_link = &gdb->next; |
| 748 | gdb = *gdb_link; |
| 749 | } |
| 750 | |
| 751 | /* If it's not on the inferior's list, remove it from GDB's tables. */ |
| 752 | else |
| 753 | { |
| 754 | /* Notify any observer that the shared object has been |
| 755 | unloaded before we remove it from GDB's tables. */ |
| 756 | observer_notify_solib_unloaded (gdb); |
| 757 | |
| 758 | VEC_safe_push (char_ptr, current_program_space->deleted_solibs, |
| 759 | xstrdup (gdb->so_name)); |
| 760 | |
| 761 | *gdb_link = gdb->next; |
| 762 | |
| 763 | /* Unless the user loaded it explicitly, free SO's objfile. */ |
| 764 | if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED) |
| 765 | && !solib_used (gdb)) |
| 766 | free_objfile (gdb->objfile); |
| 767 | |
| 768 | /* Some targets' section tables might be referring to |
| 769 | sections from so->abfd; remove them. */ |
| 770 | remove_target_sections (gdb, gdb->abfd); |
| 771 | |
| 772 | free_so (gdb); |
| 773 | gdb = *gdb_link; |
| 774 | } |
| 775 | } |
| 776 | |
| 777 | /* Now the inferior's list contains only shared objects that don't |
| 778 | appear in GDB's list --- those that are newly loaded. Add them |
| 779 | to GDB's shared object list. */ |
| 780 | if (inferior) |
| 781 | { |
| 782 | int not_found = 0; |
| 783 | const char *not_found_filename = NULL; |
| 784 | |
| 785 | struct so_list *i; |
| 786 | |
| 787 | /* Add the new shared objects to GDB's list. */ |
| 788 | *gdb_link = inferior; |
| 789 | |
| 790 | /* Fill in the rest of each of the `struct so_list' nodes. */ |
| 791 | for (i = inferior; i; i = i->next) |
| 792 | { |
| 793 | volatile struct gdb_exception e; |
| 794 | |
| 795 | i->pspace = current_program_space; |
| 796 | VEC_safe_push (so_list_ptr, current_program_space->added_solibs, i); |
| 797 | |
| 798 | TRY_CATCH (e, RETURN_MASK_ERROR) |
| 799 | { |
| 800 | /* Fill in the rest of the `struct so_list' node. */ |
| 801 | if (!solib_map_sections (i)) |
| 802 | { |
| 803 | not_found++; |
| 804 | if (not_found_filename == NULL) |
| 805 | not_found_filename = i->so_original_name; |
| 806 | } |
| 807 | } |
| 808 | |
| 809 | if (e.reason < 0) |
| 810 | exception_fprintf (gdb_stderr, e, |
| 811 | _("Error while mapping shared " |
| 812 | "library sections:\n")); |
| 813 | |
| 814 | /* Notify any observer that the shared object has been |
| 815 | loaded now that we've added it to GDB's tables. */ |
| 816 | observer_notify_solib_loaded (i); |
| 817 | } |
| 818 | |
| 819 | /* If a library was not found, issue an appropriate warning |
| 820 | message. We have to use a single call to warning in case the |
| 821 | front end does something special with warnings, e.g., pop up |
| 822 | a dialog box. It Would Be Nice if we could get a "warning: " |
| 823 | prefix on each line in the CLI front end, though - it doesn't |
| 824 | stand out well. */ |
| 825 | |
| 826 | if (not_found == 1) |
| 827 | warning (_("Could not load shared library symbols for %s.\n" |
| 828 | "Do you need \"set solib-search-path\" " |
| 829 | "or \"set sysroot\"?"), |
| 830 | not_found_filename); |
| 831 | else if (not_found > 1) |
| 832 | warning (_("\ |
| 833 | Could not load shared library symbols for %d libraries, e.g. %s.\n\ |
| 834 | Use the \"info sharedlibrary\" command to see the complete listing.\n\ |
| 835 | Do you need \"set solib-search-path\" or \"set sysroot\"?"), |
| 836 | not_found, not_found_filename); |
| 837 | } |
| 838 | } |
| 839 | |
| 840 | |
| 841 | /* Return non-zero if NAME is the libpthread shared library. |
| 842 | |
| 843 | Uses a fairly simplistic heuristic approach where we check |
| 844 | the file name against "/libpthread". This can lead to false |
| 845 | positives, but this should be good enough in practice. */ |
| 846 | |
| 847 | int |
| 848 | libpthread_name_p (const char *name) |
| 849 | { |
| 850 | return (strstr (name, "/libpthread") != NULL); |
| 851 | } |
| 852 | |
| 853 | /* Return non-zero if SO is the libpthread shared library. */ |
| 854 | |
| 855 | static int |
| 856 | libpthread_solib_p (struct so_list *so) |
| 857 | { |
| 858 | return libpthread_name_p (so->so_name); |
| 859 | } |
| 860 | |
| 861 | /* Read in symbolic information for any shared objects whose names |
| 862 | match PATTERN. (If we've already read a shared object's symbol |
| 863 | info, leave it alone.) If PATTERN is zero, read them all. |
| 864 | |
| 865 | If READSYMS is 0, defer reading symbolic information until later |
| 866 | but still do any needed low level processing. |
| 867 | |
| 868 | FROM_TTY and TARGET are as described for update_solib_list, above. */ |
| 869 | |
| 870 | void |
| 871 | solib_add (char *pattern, int from_tty, |
| 872 | struct target_ops *target, int readsyms) |
| 873 | { |
| 874 | struct so_list *gdb; |
| 875 | |
| 876 | current_program_space->solib_add_generation++; |
| 877 | |
| 878 | if (pattern) |
| 879 | { |
| 880 | char *re_err = re_comp (pattern); |
| 881 | |
| 882 | if (re_err) |
| 883 | error (_("Invalid regexp: %s"), re_err); |
| 884 | } |
| 885 | |
| 886 | update_solib_list (from_tty, target); |
| 887 | |
| 888 | /* Walk the list of currently loaded shared libraries, and read |
| 889 | symbols for any that match the pattern --- or any whose symbols |
| 890 | aren't already loaded, if no pattern was given. */ |
| 891 | { |
| 892 | int any_matches = 0; |
| 893 | int loaded_any_symbols = 0; |
| 894 | const int flags = |
| 895 | SYMFILE_DEFER_BP_RESET | (from_tty ? SYMFILE_VERBOSE : 0); |
| 896 | |
| 897 | for (gdb = so_list_head; gdb; gdb = gdb->next) |
| 898 | if (! pattern || re_exec (gdb->so_name)) |
| 899 | { |
| 900 | /* Normally, we would read the symbols from that library |
| 901 | only if READSYMS is set. However, we're making a small |
| 902 | exception for the pthread library, because we sometimes |
| 903 | need the library symbols to be loaded in order to provide |
| 904 | thread support (x86-linux for instance). */ |
| 905 | const int add_this_solib = |
| 906 | (readsyms || libpthread_solib_p (gdb)); |
| 907 | |
| 908 | any_matches = 1; |
| 909 | if (add_this_solib) |
| 910 | { |
| 911 | if (gdb->symbols_loaded) |
| 912 | { |
| 913 | /* If no pattern was given, be quiet for shared |
| 914 | libraries we have already loaded. */ |
| 915 | if (pattern && (from_tty || info_verbose)) |
| 916 | printf_unfiltered (_("Symbols already loaded for %s\n"), |
| 917 | gdb->so_name); |
| 918 | } |
| 919 | else if (solib_read_symbols (gdb, flags)) |
| 920 | loaded_any_symbols = 1; |
| 921 | } |
| 922 | } |
| 923 | |
| 924 | if (loaded_any_symbols) |
| 925 | breakpoint_re_set (); |
| 926 | |
| 927 | if (from_tty && pattern && ! any_matches) |
| 928 | printf_unfiltered |
| 929 | ("No loaded shared libraries match the pattern `%s'.\n", pattern); |
| 930 | |
| 931 | if (loaded_any_symbols) |
| 932 | { |
| 933 | struct target_so_ops *ops = solib_ops (target_gdbarch ()); |
| 934 | |
| 935 | /* Getting new symbols may change our opinion about what is |
| 936 | frameless. */ |
| 937 | reinit_frame_cache (); |
| 938 | |
| 939 | ops->special_symbol_handling (); |
| 940 | } |
| 941 | } |
| 942 | } |
| 943 | |
| 944 | /* Implement the "info sharedlibrary" command. Walk through the |
| 945 | shared library list and print information about each attached |
| 946 | library matching PATTERN. If PATTERN is elided, print them |
| 947 | all. */ |
| 948 | |
| 949 | static void |
| 950 | info_sharedlibrary_command (char *pattern, int from_tty) |
| 951 | { |
| 952 | struct so_list *so = NULL; /* link map state variable */ |
| 953 | int so_missing_debug_info = 0; |
| 954 | int addr_width; |
| 955 | int nr_libs; |
| 956 | struct cleanup *table_cleanup; |
| 957 | struct gdbarch *gdbarch = target_gdbarch (); |
| 958 | struct ui_out *uiout = current_uiout; |
| 959 | |
| 960 | if (pattern) |
| 961 | { |
| 962 | char *re_err = re_comp (pattern); |
| 963 | |
| 964 | if (re_err) |
| 965 | error (_("Invalid regexp: %s"), re_err); |
| 966 | } |
| 967 | |
| 968 | /* "0x", a little whitespace, and two hex digits per byte of pointers. */ |
| 969 | addr_width = 4 + (gdbarch_ptr_bit (gdbarch) / 4); |
| 970 | |
| 971 | update_solib_list (from_tty, 0); |
| 972 | |
| 973 | /* make_cleanup_ui_out_table_begin_end needs to know the number of |
| 974 | rows, so we need to make two passes over the libs. */ |
| 975 | |
| 976 | for (nr_libs = 0, so = so_list_head; so; so = so->next) |
| 977 | { |
| 978 | if (so->so_name[0]) |
| 979 | { |
| 980 | if (pattern && ! re_exec (so->so_name)) |
| 981 | continue; |
| 982 | ++nr_libs; |
| 983 | } |
| 984 | } |
| 985 | |
| 986 | table_cleanup = |
| 987 | make_cleanup_ui_out_table_begin_end (uiout, 4, nr_libs, |
| 988 | "SharedLibraryTable"); |
| 989 | |
| 990 | /* The "- 1" is because ui_out adds one space between columns. */ |
| 991 | ui_out_table_header (uiout, addr_width - 1, ui_left, "from", "From"); |
| 992 | ui_out_table_header (uiout, addr_width - 1, ui_left, "to", "To"); |
| 993 | ui_out_table_header (uiout, 12 - 1, ui_left, "syms-read", "Syms Read"); |
| 994 | ui_out_table_header (uiout, 0, ui_noalign, |
| 995 | "name", "Shared Object Library"); |
| 996 | |
| 997 | ui_out_table_body (uiout); |
| 998 | |
| 999 | for (so = so_list_head; so; so = so->next) |
| 1000 | { |
| 1001 | struct cleanup *lib_cleanup; |
| 1002 | |
| 1003 | if (! so->so_name[0]) |
| 1004 | continue; |
| 1005 | if (pattern && ! re_exec (so->so_name)) |
| 1006 | continue; |
| 1007 | |
| 1008 | lib_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, "lib"); |
| 1009 | |
| 1010 | if (so->addr_high != 0) |
| 1011 | { |
| 1012 | ui_out_field_core_addr (uiout, "from", gdbarch, so->addr_low); |
| 1013 | ui_out_field_core_addr (uiout, "to", gdbarch, so->addr_high); |
| 1014 | } |
| 1015 | else |
| 1016 | { |
| 1017 | ui_out_field_skip (uiout, "from"); |
| 1018 | ui_out_field_skip (uiout, "to"); |
| 1019 | } |
| 1020 | |
| 1021 | if (! ui_out_is_mi_like_p (interp_ui_out (top_level_interpreter ())) |
| 1022 | && so->symbols_loaded |
| 1023 | && !objfile_has_symbols (so->objfile)) |
| 1024 | { |
| 1025 | so_missing_debug_info = 1; |
| 1026 | ui_out_field_string (uiout, "syms-read", "Yes (*)"); |
| 1027 | } |
| 1028 | else |
| 1029 | ui_out_field_string (uiout, "syms-read", |
| 1030 | so->symbols_loaded ? "Yes" : "No"); |
| 1031 | |
| 1032 | ui_out_field_string (uiout, "name", so->so_name); |
| 1033 | |
| 1034 | ui_out_text (uiout, "\n"); |
| 1035 | |
| 1036 | do_cleanups (lib_cleanup); |
| 1037 | } |
| 1038 | |
| 1039 | do_cleanups (table_cleanup); |
| 1040 | |
| 1041 | if (nr_libs == 0) |
| 1042 | { |
| 1043 | if (pattern) |
| 1044 | ui_out_message (uiout, 0, |
| 1045 | _("No shared libraries matched.\n")); |
| 1046 | else |
| 1047 | ui_out_message (uiout, 0, |
| 1048 | _("No shared libraries loaded at this time.\n")); |
| 1049 | } |
| 1050 | else |
| 1051 | { |
| 1052 | if (so_missing_debug_info) |
| 1053 | ui_out_message (uiout, 0, |
| 1054 | _("(*): Shared library is missing " |
| 1055 | "debugging information.\n")); |
| 1056 | } |
| 1057 | } |
| 1058 | |
| 1059 | /* Return 1 if ADDRESS lies within SOLIB. */ |
| 1060 | |
| 1061 | int |
| 1062 | solib_contains_address_p (const struct so_list *const solib, |
| 1063 | CORE_ADDR address) |
| 1064 | { |
| 1065 | struct target_section *p; |
| 1066 | |
| 1067 | for (p = solib->sections; p < solib->sections_end; p++) |
| 1068 | if (p->addr <= address && address < p->endaddr) |
| 1069 | return 1; |
| 1070 | |
| 1071 | return 0; |
| 1072 | } |
| 1073 | |
| 1074 | /* If ADDRESS is in a shared lib in program space PSPACE, return its |
| 1075 | name. |
| 1076 | |
| 1077 | Provides a hook for other gdb routines to discover whether or not a |
| 1078 | particular address is within the mapped address space of a shared |
| 1079 | library. |
| 1080 | |
| 1081 | For example, this routine is called at one point to disable |
| 1082 | breakpoints which are in shared libraries that are not currently |
| 1083 | mapped in. */ |
| 1084 | |
| 1085 | char * |
| 1086 | solib_name_from_address (struct program_space *pspace, CORE_ADDR address) |
| 1087 | { |
| 1088 | struct so_list *so = NULL; |
| 1089 | |
| 1090 | for (so = pspace->so_list; so; so = so->next) |
| 1091 | if (solib_contains_address_p (so, address)) |
| 1092 | return (so->so_name); |
| 1093 | |
| 1094 | return (0); |
| 1095 | } |
| 1096 | |
| 1097 | /* Return whether the data starting at VADDR, size SIZE, must be kept |
| 1098 | in a core file for shared libraries loaded before "gcore" is used |
| 1099 | to be handled correctly when the core file is loaded. This only |
| 1100 | applies when the section would otherwise not be kept in the core |
| 1101 | file (in particular, for readonly sections). */ |
| 1102 | |
| 1103 | int |
| 1104 | solib_keep_data_in_core (CORE_ADDR vaddr, unsigned long size) |
| 1105 | { |
| 1106 | struct target_so_ops *ops = solib_ops (target_gdbarch ()); |
| 1107 | |
| 1108 | if (ops->keep_data_in_core) |
| 1109 | return ops->keep_data_in_core (vaddr, size); |
| 1110 | else |
| 1111 | return 0; |
| 1112 | } |
| 1113 | |
| 1114 | /* Called by free_all_symtabs */ |
| 1115 | |
| 1116 | void |
| 1117 | clear_solib (void) |
| 1118 | { |
| 1119 | struct target_so_ops *ops = solib_ops (target_gdbarch ()); |
| 1120 | |
| 1121 | /* This function is expected to handle ELF shared libraries. It is |
| 1122 | also used on Solaris, which can run either ELF or a.out binaries |
| 1123 | (for compatibility with SunOS 4), both of which can use shared |
| 1124 | libraries. So we don't know whether we have an ELF executable or |
| 1125 | an a.out executable until the user chooses an executable file. |
| 1126 | |
| 1127 | ELF shared libraries don't get mapped into the address space |
| 1128 | until after the program starts, so we'd better not try to insert |
| 1129 | breakpoints in them immediately. We have to wait until the |
| 1130 | dynamic linker has loaded them; we'll hit a bp_shlib_event |
| 1131 | breakpoint (look for calls to create_solib_event_breakpoint) when |
| 1132 | it's ready. |
| 1133 | |
| 1134 | SunOS shared libraries seem to be different --- they're present |
| 1135 | as soon as the process begins execution, so there's no need to |
| 1136 | put off inserting breakpoints. There's also nowhere to put a |
| 1137 | bp_shlib_event breakpoint, so if we put it off, we'll never get |
| 1138 | around to it. |
| 1139 | |
| 1140 | So: disable breakpoints only if we're using ELF shared libs. */ |
| 1141 | if (exec_bfd != NULL |
| 1142 | && bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour) |
| 1143 | disable_breakpoints_in_shlibs (); |
| 1144 | |
| 1145 | while (so_list_head) |
| 1146 | { |
| 1147 | struct so_list *so = so_list_head; |
| 1148 | |
| 1149 | so_list_head = so->next; |
| 1150 | observer_notify_solib_unloaded (so); |
| 1151 | if (so->abfd) |
| 1152 | remove_target_sections (so, so->abfd); |
| 1153 | free_so (so); |
| 1154 | } |
| 1155 | |
| 1156 | ops->clear_solib (); |
| 1157 | } |
| 1158 | |
| 1159 | /* Shared library startup support. When GDB starts up the inferior, |
| 1160 | it nurses it along (through the shell) until it is ready to execute |
| 1161 | its first instruction. At this point, this function gets |
| 1162 | called. */ |
| 1163 | |
| 1164 | void |
| 1165 | solib_create_inferior_hook (int from_tty) |
| 1166 | { |
| 1167 | struct target_so_ops *ops = solib_ops (target_gdbarch ()); |
| 1168 | |
| 1169 | ops->solib_create_inferior_hook (from_tty); |
| 1170 | } |
| 1171 | |
| 1172 | /* Check to see if an address is in the dynamic loader's dynamic |
| 1173 | symbol resolution code. Return 1 if so, 0 otherwise. */ |
| 1174 | |
| 1175 | int |
| 1176 | in_solib_dynsym_resolve_code (CORE_ADDR pc) |
| 1177 | { |
| 1178 | struct target_so_ops *ops = solib_ops (target_gdbarch ()); |
| 1179 | |
| 1180 | return ops->in_dynsym_resolve_code (pc); |
| 1181 | } |
| 1182 | |
| 1183 | /* Implements the "sharedlibrary" command. */ |
| 1184 | |
| 1185 | static void |
| 1186 | sharedlibrary_command (char *args, int from_tty) |
| 1187 | { |
| 1188 | dont_repeat (); |
| 1189 | solib_add (args, from_tty, (struct target_ops *) 0, 1); |
| 1190 | } |
| 1191 | |
| 1192 | /* Implements the command "nosharedlibrary", which discards symbols |
| 1193 | that have been auto-loaded from shared libraries. Symbols from |
| 1194 | shared libraries that were added by explicit request of the user |
| 1195 | are not discarded. Also called from remote.c. */ |
| 1196 | |
| 1197 | void |
| 1198 | no_shared_libraries (char *ignored, int from_tty) |
| 1199 | { |
| 1200 | /* The order of the two routines below is important: clear_solib notifies |
| 1201 | the solib_unloaded observers, and some of these observers might need |
| 1202 | access to their associated objfiles. Therefore, we can not purge the |
| 1203 | solibs' objfiles before clear_solib has been called. */ |
| 1204 | |
| 1205 | clear_solib (); |
| 1206 | objfile_purge_solibs (); |
| 1207 | } |
| 1208 | |
| 1209 | /* Reload shared libraries, but avoid reloading the same symbol file |
| 1210 | we already have loaded. */ |
| 1211 | |
| 1212 | static void |
| 1213 | reload_shared_libraries_1 (int from_tty) |
| 1214 | { |
| 1215 | struct so_list *so; |
| 1216 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
| 1217 | |
| 1218 | for (so = so_list_head; so != NULL; so = so->next) |
| 1219 | { |
| 1220 | char *filename, *found_pathname = NULL; |
| 1221 | bfd *abfd; |
| 1222 | int was_loaded = so->symbols_loaded; |
| 1223 | const int flags = |
| 1224 | SYMFILE_DEFER_BP_RESET | (from_tty ? SYMFILE_VERBOSE : 0); |
| 1225 | |
| 1226 | filename = tilde_expand (so->so_original_name); |
| 1227 | make_cleanup (xfree, filename); |
| 1228 | abfd = solib_bfd_open (filename); |
| 1229 | if (abfd != NULL) |
| 1230 | { |
| 1231 | found_pathname = xstrdup (bfd_get_filename (abfd)); |
| 1232 | make_cleanup (xfree, found_pathname); |
| 1233 | gdb_bfd_unref (abfd); |
| 1234 | } |
| 1235 | |
| 1236 | /* If this shared library is no longer associated with its previous |
| 1237 | symbol file, close that. */ |
| 1238 | if ((found_pathname == NULL && was_loaded) |
| 1239 | || (found_pathname != NULL |
| 1240 | && filename_cmp (found_pathname, so->so_name) != 0)) |
| 1241 | { |
| 1242 | if (so->objfile && ! (so->objfile->flags & OBJF_USERLOADED) |
| 1243 | && !solib_used (so)) |
| 1244 | free_objfile (so->objfile); |
| 1245 | remove_target_sections (so, so->abfd); |
| 1246 | free_so_symbols (so); |
| 1247 | } |
| 1248 | |
| 1249 | /* If this shared library is now associated with a new symbol |
| 1250 | file, open it. */ |
| 1251 | if (found_pathname != NULL |
| 1252 | && (!was_loaded |
| 1253 | || filename_cmp (found_pathname, so->so_name) != 0)) |
| 1254 | { |
| 1255 | volatile struct gdb_exception e; |
| 1256 | |
| 1257 | TRY_CATCH (e, RETURN_MASK_ERROR) |
| 1258 | solib_map_sections (so); |
| 1259 | |
| 1260 | if (e.reason < 0) |
| 1261 | exception_fprintf (gdb_stderr, e, |
| 1262 | _("Error while mapping " |
| 1263 | "shared library sections:\n")); |
| 1264 | else if (auto_solib_add || was_loaded || libpthread_solib_p (so)) |
| 1265 | solib_read_symbols (so, flags); |
| 1266 | } |
| 1267 | } |
| 1268 | |
| 1269 | do_cleanups (old_chain); |
| 1270 | } |
| 1271 | |
| 1272 | static void |
| 1273 | reload_shared_libraries (char *ignored, int from_tty, |
| 1274 | struct cmd_list_element *e) |
| 1275 | { |
| 1276 | struct target_so_ops *ops; |
| 1277 | |
| 1278 | reload_shared_libraries_1 (from_tty); |
| 1279 | |
| 1280 | ops = solib_ops (target_gdbarch ()); |
| 1281 | |
| 1282 | /* Creating inferior hooks here has two purposes. First, if we reload |
| 1283 | shared libraries then the address of solib breakpoint we've computed |
| 1284 | previously might be no longer valid. For example, if we forgot to set |
| 1285 | solib-absolute-prefix and are setting it right now, then the previous |
| 1286 | breakpoint address is plain wrong. Second, installing solib hooks |
| 1287 | also implicitly figures were ld.so is and loads symbols for it. |
| 1288 | Absent this call, if we've just connected to a target and set |
| 1289 | solib-absolute-prefix or solib-search-path, we'll lose all information |
| 1290 | about ld.so. */ |
| 1291 | if (target_has_execution) |
| 1292 | { |
| 1293 | /* Reset or free private data structures not associated with |
| 1294 | so_list entries. */ |
| 1295 | ops->clear_solib (); |
| 1296 | |
| 1297 | /* Remove any previous solib event breakpoint. This is usually |
| 1298 | done in common code, at breakpoint_init_inferior time, but |
| 1299 | we're not really starting up the inferior here. */ |
| 1300 | remove_solib_event_breakpoints (); |
| 1301 | |
| 1302 | #ifdef SOLIB_CREATE_INFERIOR_HOOK |
| 1303 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
| 1304 | #else |
| 1305 | solib_create_inferior_hook (from_tty); |
| 1306 | #endif |
| 1307 | } |
| 1308 | |
| 1309 | /* Sometimes the platform-specific hook loads initial shared |
| 1310 | libraries, and sometimes it doesn't. If it doesn't FROM_TTY will be |
| 1311 | incorrectly 0 but such solib targets should be fixed anyway. If we |
| 1312 | made all the inferior hook methods consistent, this call could be |
| 1313 | removed. Call it only after the solib target has been initialized by |
| 1314 | solib_create_inferior_hook. */ |
| 1315 | |
| 1316 | solib_add (NULL, 0, NULL, auto_solib_add); |
| 1317 | |
| 1318 | breakpoint_re_set (); |
| 1319 | |
| 1320 | /* We may have loaded or unloaded debug info for some (or all) |
| 1321 | shared libraries. However, frames may still reference them. For |
| 1322 | example, a frame's unwinder might still point at DWARF FDE |
| 1323 | structures that are now freed. Also, getting new symbols may |
| 1324 | change our opinion about what is frameless. */ |
| 1325 | reinit_frame_cache (); |
| 1326 | |
| 1327 | ops->special_symbol_handling (); |
| 1328 | } |
| 1329 | |
| 1330 | static void |
| 1331 | show_auto_solib_add (struct ui_file *file, int from_tty, |
| 1332 | struct cmd_list_element *c, const char *value) |
| 1333 | { |
| 1334 | fprintf_filtered (file, _("Autoloading of shared library symbols is %s.\n"), |
| 1335 | value); |
| 1336 | } |
| 1337 | |
| 1338 | |
| 1339 | /* Handler for library-specific lookup of global symbol NAME in OBJFILE. Call |
| 1340 | the library-specific handler if it is installed for the current target. */ |
| 1341 | |
| 1342 | struct symbol * |
| 1343 | solib_global_lookup (const struct objfile *objfile, |
| 1344 | const char *name, |
| 1345 | const domain_enum domain) |
| 1346 | { |
| 1347 | struct target_so_ops *ops = solib_ops (target_gdbarch ()); |
| 1348 | |
| 1349 | if (ops->lookup_lib_global_symbol != NULL) |
| 1350 | return ops->lookup_lib_global_symbol (objfile, name, domain); |
| 1351 | return NULL; |
| 1352 | } |
| 1353 | |
| 1354 | /* Lookup the value for a specific symbol from dynamic symbol table. Look |
| 1355 | up symbol from ABFD. MATCH_SYM is a callback function to determine |
| 1356 | whether to pick up a symbol. DATA is the input of this callback |
| 1357 | function. Return NULL if symbol is not found. */ |
| 1358 | |
| 1359 | CORE_ADDR |
| 1360 | gdb_bfd_lookup_symbol_from_symtab (bfd *abfd, |
| 1361 | int (*match_sym) (asymbol *, void *), |
| 1362 | void *data) |
| 1363 | { |
| 1364 | long storage_needed = bfd_get_symtab_upper_bound (abfd); |
| 1365 | CORE_ADDR symaddr = 0; |
| 1366 | |
| 1367 | if (storage_needed > 0) |
| 1368 | { |
| 1369 | unsigned int i; |
| 1370 | |
| 1371 | asymbol **symbol_table = (asymbol **) xmalloc (storage_needed); |
| 1372 | struct cleanup *back_to = make_cleanup (xfree, symbol_table); |
| 1373 | unsigned int number_of_symbols = |
| 1374 | bfd_canonicalize_symtab (abfd, symbol_table); |
| 1375 | |
| 1376 | for (i = 0; i < number_of_symbols; i++) |
| 1377 | { |
| 1378 | asymbol *sym = *symbol_table++; |
| 1379 | |
| 1380 | if (match_sym (sym, data)) |
| 1381 | { |
| 1382 | /* BFD symbols are section relative. */ |
| 1383 | symaddr = sym->value + sym->section->vma; |
| 1384 | break; |
| 1385 | } |
| 1386 | } |
| 1387 | do_cleanups (back_to); |
| 1388 | } |
| 1389 | |
| 1390 | return symaddr; |
| 1391 | } |
| 1392 | |
| 1393 | /* Lookup the value for a specific symbol from symbol table. Look up symbol |
| 1394 | from ABFD. MATCH_SYM is a callback function to determine whether to pick |
| 1395 | up a symbol. DATA is the input of this callback function. Return NULL |
| 1396 | if symbol is not found. */ |
| 1397 | |
| 1398 | static CORE_ADDR |
| 1399 | bfd_lookup_symbol_from_dyn_symtab (bfd *abfd, |
| 1400 | int (*match_sym) (asymbol *, void *), |
| 1401 | void *data) |
| 1402 | { |
| 1403 | long storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); |
| 1404 | CORE_ADDR symaddr = 0; |
| 1405 | |
| 1406 | if (storage_needed > 0) |
| 1407 | { |
| 1408 | unsigned int i; |
| 1409 | asymbol **symbol_table = (asymbol **) xmalloc (storage_needed); |
| 1410 | struct cleanup *back_to = make_cleanup (xfree, symbol_table); |
| 1411 | unsigned int number_of_symbols = |
| 1412 | bfd_canonicalize_dynamic_symtab (abfd, symbol_table); |
| 1413 | |
| 1414 | for (i = 0; i < number_of_symbols; i++) |
| 1415 | { |
| 1416 | asymbol *sym = *symbol_table++; |
| 1417 | |
| 1418 | if (match_sym (sym, data)) |
| 1419 | { |
| 1420 | /* BFD symbols are section relative. */ |
| 1421 | symaddr = sym->value + sym->section->vma; |
| 1422 | break; |
| 1423 | } |
| 1424 | } |
| 1425 | do_cleanups (back_to); |
| 1426 | } |
| 1427 | return symaddr; |
| 1428 | } |
| 1429 | |
| 1430 | /* Lookup the value for a specific symbol from symbol table and dynamic |
| 1431 | symbol table. Look up symbol from ABFD. MATCH_SYM is a callback |
| 1432 | function to determine whether to pick up a symbol. DATA is the |
| 1433 | input of this callback function. Return NULL if symbol is not |
| 1434 | found. */ |
| 1435 | |
| 1436 | CORE_ADDR |
| 1437 | gdb_bfd_lookup_symbol (bfd *abfd, |
| 1438 | int (*match_sym) (asymbol *, void *), |
| 1439 | void *data) |
| 1440 | { |
| 1441 | CORE_ADDR symaddr = gdb_bfd_lookup_symbol_from_symtab (abfd, match_sym, data); |
| 1442 | |
| 1443 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll |
| 1444 | have to check the dynamic string table too. */ |
| 1445 | if (symaddr == 0) |
| 1446 | symaddr = bfd_lookup_symbol_from_dyn_symtab (abfd, match_sym, data); |
| 1447 | |
| 1448 | return symaddr; |
| 1449 | } |
| 1450 | |
| 1451 | extern initialize_file_ftype _initialize_solib; /* -Wmissing-prototypes */ |
| 1452 | |
| 1453 | void |
| 1454 | _initialize_solib (void) |
| 1455 | { |
| 1456 | solib_data = gdbarch_data_register_pre_init (solib_init); |
| 1457 | |
| 1458 | add_com ("sharedlibrary", class_files, sharedlibrary_command, |
| 1459 | _("Load shared object library symbols for files matching REGEXP.")); |
| 1460 | add_info ("sharedlibrary", info_sharedlibrary_command, |
| 1461 | _("Status of loaded shared object libraries.")); |
| 1462 | add_com ("nosharedlibrary", class_files, no_shared_libraries, |
| 1463 | _("Unload all shared object library symbols.")); |
| 1464 | |
| 1465 | add_setshow_boolean_cmd ("auto-solib-add", class_support, |
| 1466 | &auto_solib_add, _("\ |
| 1467 | Set autoloading of shared library symbols."), _("\ |
| 1468 | Show autoloading of shared library symbols."), _("\ |
| 1469 | If \"on\", symbols from all shared object libraries will be loaded\n\ |
| 1470 | automatically when the inferior begins execution, when the dynamic linker\n\ |
| 1471 | informs gdb that a new library has been loaded, or when attaching to the\n\ |
| 1472 | inferior. Otherwise, symbols must be loaded manually, using \ |
| 1473 | `sharedlibrary'."), |
| 1474 | NULL, |
| 1475 | show_auto_solib_add, |
| 1476 | &setlist, &showlist); |
| 1477 | |
| 1478 | add_setshow_filename_cmd ("sysroot", class_support, |
| 1479 | &gdb_sysroot, _("\ |
| 1480 | Set an alternate system root."), _("\ |
| 1481 | Show the current system root."), _("\ |
| 1482 | The system root is used to load absolute shared library symbol files.\n\ |
| 1483 | For other (relative) files, you can add directories using\n\ |
| 1484 | `set solib-search-path'."), |
| 1485 | reload_shared_libraries, |
| 1486 | NULL, |
| 1487 | &setlist, &showlist); |
| 1488 | |
| 1489 | add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0, |
| 1490 | &setlist); |
| 1491 | add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0, |
| 1492 | &showlist); |
| 1493 | |
| 1494 | add_setshow_optional_filename_cmd ("solib-search-path", class_support, |
| 1495 | &solib_search_path, _("\ |
| 1496 | Set the search path for loading non-absolute shared library symbol files."), |
| 1497 | _("\ |
| 1498 | Show the search path for loading non-absolute shared library symbol files."), |
| 1499 | _("\ |
| 1500 | This takes precedence over the environment variables \ |
| 1501 | PATH and LD_LIBRARY_PATH."), |
| 1502 | reload_shared_libraries, |
| 1503 | show_solib_search_path, |
| 1504 | &setlist, &showlist); |
| 1505 | } |