| 1 | /* Handle shared libraries for GDB, the GNU Debugger. |
| 2 | |
| 3 | Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 4 | 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009 |
| 5 | Free Software Foundation, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | |
| 24 | #include <sys/types.h> |
| 25 | #include <fcntl.h> |
| 26 | #include "gdb_string.h" |
| 27 | #include "symtab.h" |
| 28 | #include "bfd.h" |
| 29 | #include "symfile.h" |
| 30 | #include "objfiles.h" |
| 31 | #include "exceptions.h" |
| 32 | #include "gdbcore.h" |
| 33 | #include "command.h" |
| 34 | #include "target.h" |
| 35 | #include "frame.h" |
| 36 | #include "gdb_regex.h" |
| 37 | #include "inferior.h" |
| 38 | #include "environ.h" |
| 39 | #include "language.h" |
| 40 | #include "gdbcmd.h" |
| 41 | #include "completer.h" |
| 42 | #include "filenames.h" /* for DOSish file names */ |
| 43 | #include "exec.h" |
| 44 | #include "solist.h" |
| 45 | #include "observer.h" |
| 46 | #include "readline/readline.h" |
| 47 | #include "remote.h" |
| 48 | |
| 49 | /* Architecture-specific operations. */ |
| 50 | |
| 51 | /* Per-architecture data key. */ |
| 52 | static struct gdbarch_data *solib_data; |
| 53 | |
| 54 | static void * |
| 55 | solib_init (struct obstack *obstack) |
| 56 | { |
| 57 | struct target_so_ops **ops; |
| 58 | |
| 59 | ops = OBSTACK_ZALLOC (obstack, struct target_so_ops *); |
| 60 | *ops = current_target_so_ops; |
| 61 | return ops; |
| 62 | } |
| 63 | |
| 64 | static struct target_so_ops * |
| 65 | solib_ops (struct gdbarch *gdbarch) |
| 66 | { |
| 67 | struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data); |
| 68 | return *ops; |
| 69 | } |
| 70 | |
| 71 | /* Set the solib operations for GDBARCH to NEW_OPS. */ |
| 72 | |
| 73 | void |
| 74 | set_solib_ops (struct gdbarch *gdbarch, struct target_so_ops *new_ops) |
| 75 | { |
| 76 | struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data); |
| 77 | *ops = new_ops; |
| 78 | } |
| 79 | \f |
| 80 | |
| 81 | /* external data declarations */ |
| 82 | |
| 83 | /* FIXME: gdbarch needs to control this variable, or else every |
| 84 | configuration needs to call set_solib_ops. */ |
| 85 | struct target_so_ops *current_target_so_ops; |
| 86 | |
| 87 | /* local data declarations */ |
| 88 | |
| 89 | static struct so_list *so_list_head; /* List of known shared objects */ |
| 90 | |
| 91 | /* Local function prototypes */ |
| 92 | |
| 93 | /* If non-empty, this is a search path for loading non-absolute shared library |
| 94 | symbol files. This takes precedence over the environment variables PATH |
| 95 | and LD_LIBRARY_PATH. */ |
| 96 | static char *solib_search_path = NULL; |
| 97 | static void |
| 98 | show_solib_search_path (struct ui_file *file, int from_tty, |
| 99 | struct cmd_list_element *c, const char *value) |
| 100 | { |
| 101 | fprintf_filtered (file, _("\ |
| 102 | The search path for loading non-absolute shared library symbol files is %s.\n"), |
| 103 | value); |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | |
| 108 | GLOBAL FUNCTION |
| 109 | |
| 110 | solib_find -- Find a shared library file. |
| 111 | |
| 112 | SYNOPSIS |
| 113 | |
| 114 | char *solib_find (char *in_pathname, int *fd); |
| 115 | |
| 116 | DESCRIPTION |
| 117 | |
| 118 | Global variable GDB_SYSROOT is used as a prefix directory |
| 119 | to search for shared libraries if they have an absolute path. |
| 120 | |
| 121 | Global variable SOLIB_SEARCH_PATH is used as a prefix directory |
| 122 | (or set of directories, as in LD_LIBRARY_PATH) to search for all |
| 123 | shared libraries if not found in GDB_SYSROOT. |
| 124 | |
| 125 | Search algorithm: |
| 126 | * If there is a gdb_sysroot and path is absolute: |
| 127 | * Search for gdb_sysroot/path. |
| 128 | * else |
| 129 | * Look for it literally (unmodified). |
| 130 | * Look in SOLIB_SEARCH_PATH. |
| 131 | * If available, use target defined search function. |
| 132 | * If gdb_sysroot is NOT set, perform the following two searches: |
| 133 | * Look in inferior's $PATH. |
| 134 | * Look in inferior's $LD_LIBRARY_PATH. |
| 135 | * |
| 136 | * The last check avoids doing this search when targetting remote |
| 137 | * machines since gdb_sysroot will almost always be set. |
| 138 | |
| 139 | RETURNS |
| 140 | |
| 141 | Full pathname of the shared library file, or NULL if not found. |
| 142 | (The pathname is malloc'ed; it needs to be freed by the caller.) |
| 143 | *FD is set to either -1 or an open file handle for the library. */ |
| 144 | |
| 145 | char * |
| 146 | solib_find (char *in_pathname, int *fd) |
| 147 | { |
| 148 | struct target_so_ops *ops = solib_ops (target_gdbarch); |
| 149 | int found_file = -1; |
| 150 | char *temp_pathname = NULL; |
| 151 | int gdb_sysroot_is_empty; |
| 152 | |
| 153 | gdb_sysroot_is_empty = (gdb_sysroot == NULL || *gdb_sysroot == 0); |
| 154 | |
| 155 | if (! IS_ABSOLUTE_PATH (in_pathname) || gdb_sysroot_is_empty) |
| 156 | temp_pathname = in_pathname; |
| 157 | else |
| 158 | { |
| 159 | int prefix_len = strlen (gdb_sysroot); |
| 160 | |
| 161 | /* Remove trailing slashes from absolute prefix. */ |
| 162 | while (prefix_len > 0 |
| 163 | && IS_DIR_SEPARATOR (gdb_sysroot[prefix_len - 1])) |
| 164 | prefix_len--; |
| 165 | |
| 166 | /* Cat the prefixed pathname together. */ |
| 167 | temp_pathname = alloca (prefix_len + strlen (in_pathname) + 1); |
| 168 | strncpy (temp_pathname, gdb_sysroot, prefix_len); |
| 169 | temp_pathname[prefix_len] = '\0'; |
| 170 | strcat (temp_pathname, in_pathname); |
| 171 | } |
| 172 | |
| 173 | /* Handle remote files. */ |
| 174 | if (remote_filename_p (temp_pathname)) |
| 175 | { |
| 176 | *fd = -1; |
| 177 | return xstrdup (temp_pathname); |
| 178 | } |
| 179 | |
| 180 | /* Now see if we can open it. */ |
| 181 | found_file = open (temp_pathname, O_RDONLY | O_BINARY, 0); |
| 182 | |
| 183 | /* We try to find the library in various ways. After each attempt |
| 184 | (except for the one above), either found_file >= 0 and |
| 185 | temp_pathname is a malloc'd string, or found_file < 0 and |
| 186 | temp_pathname does not point to storage that needs to be |
| 187 | freed. */ |
| 188 | |
| 189 | if (found_file < 0) |
| 190 | temp_pathname = NULL; |
| 191 | else |
| 192 | temp_pathname = xstrdup (temp_pathname); |
| 193 | |
| 194 | /* If the search in gdb_sysroot failed, and the path name is |
| 195 | absolute at this point, make it relative. (openp will try and open the |
| 196 | file according to its absolute path otherwise, which is not what we want.) |
| 197 | Affects subsequent searches for this solib. */ |
| 198 | if (found_file < 0 && IS_ABSOLUTE_PATH (in_pathname)) |
| 199 | { |
| 200 | /* First, get rid of any drive letters etc. */ |
| 201 | while (!IS_DIR_SEPARATOR (*in_pathname)) |
| 202 | in_pathname++; |
| 203 | |
| 204 | /* Next, get rid of all leading dir separators. */ |
| 205 | while (IS_DIR_SEPARATOR (*in_pathname)) |
| 206 | in_pathname++; |
| 207 | } |
| 208 | |
| 209 | /* If not found, search the solib_search_path (if any). */ |
| 210 | if (found_file < 0 && solib_search_path != NULL) |
| 211 | found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST, |
| 212 | in_pathname, O_RDONLY | O_BINARY, 0, &temp_pathname); |
| 213 | |
| 214 | /* If not found, next search the solib_search_path (if any) for the basename |
| 215 | only (ignoring the path). This is to allow reading solibs from a path |
| 216 | that differs from the opened path. */ |
| 217 | if (found_file < 0 && solib_search_path != NULL) |
| 218 | found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST, |
| 219 | lbasename (in_pathname), O_RDONLY | O_BINARY, 0, |
| 220 | &temp_pathname); |
| 221 | |
| 222 | /* If not found, try to use target supplied solib search method */ |
| 223 | if (found_file < 0 && ops->find_and_open_solib) |
| 224 | found_file = ops->find_and_open_solib (in_pathname, O_RDONLY | O_BINARY, |
| 225 | &temp_pathname); |
| 226 | |
| 227 | /* If not found, next search the inferior's $PATH environment variable. */ |
| 228 | if (found_file < 0 && gdb_sysroot_is_empty) |
| 229 | found_file = openp (get_in_environ (inferior_environ, "PATH"), |
| 230 | OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY | O_BINARY, 0, |
| 231 | &temp_pathname); |
| 232 | |
| 233 | /* If not found, next search the inferior's $LD_LIBRARY_PATH |
| 234 | environment variable. */ |
| 235 | if (found_file < 0 && gdb_sysroot_is_empty) |
| 236 | found_file = openp (get_in_environ (inferior_environ, "LD_LIBRARY_PATH"), |
| 237 | OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY | O_BINARY, 0, |
| 238 | &temp_pathname); |
| 239 | |
| 240 | *fd = found_file; |
| 241 | return temp_pathname; |
| 242 | } |
| 243 | |
| 244 | /* Open and return a BFD for the shared library PATHNAME. If FD is not -1, |
| 245 | it is used as file handle to open the file. Throws an error if the file |
| 246 | could not be opened. Handles both local and remote file access. |
| 247 | |
| 248 | PATHNAME must be malloc'ed by the caller. If successful, the new BFD's |
| 249 | name will point to it. If unsuccessful, PATHNAME will be freed and the |
| 250 | FD will be closed (unless FD was -1). */ |
| 251 | |
| 252 | bfd * |
| 253 | solib_bfd_fopen (char *pathname, int fd) |
| 254 | { |
| 255 | bfd *abfd; |
| 256 | |
| 257 | if (remote_filename_p (pathname)) |
| 258 | { |
| 259 | gdb_assert (fd == -1); |
| 260 | abfd = remote_bfd_open (pathname, gnutarget); |
| 261 | } |
| 262 | else |
| 263 | { |
| 264 | abfd = bfd_fopen (pathname, gnutarget, FOPEN_RB, fd); |
| 265 | |
| 266 | if (abfd) |
| 267 | bfd_set_cacheable (abfd, 1); |
| 268 | else if (fd != -1) |
| 269 | close (fd); |
| 270 | } |
| 271 | |
| 272 | if (!abfd) |
| 273 | { |
| 274 | make_cleanup (xfree, pathname); |
| 275 | error (_("Could not open `%s' as an executable file: %s"), |
| 276 | pathname, bfd_errmsg (bfd_get_error ())); |
| 277 | } |
| 278 | |
| 279 | return abfd; |
| 280 | } |
| 281 | |
| 282 | /* Find shared library PATHNAME and open a BFD for it. */ |
| 283 | |
| 284 | bfd * |
| 285 | solib_bfd_open (char *pathname) |
| 286 | { |
| 287 | struct target_so_ops *ops = solib_ops (target_gdbarch); |
| 288 | char *found_pathname; |
| 289 | int found_file; |
| 290 | bfd *abfd; |
| 291 | |
| 292 | /* Use target-specific override if present. */ |
| 293 | if (ops->bfd_open) |
| 294 | return ops->bfd_open (pathname); |
| 295 | |
| 296 | /* Search for shared library file. */ |
| 297 | found_pathname = solib_find (pathname, &found_file); |
| 298 | if (found_pathname == NULL) |
| 299 | perror_with_name (pathname); |
| 300 | |
| 301 | /* Open bfd for shared library. */ |
| 302 | abfd = solib_bfd_fopen (found_pathname, found_file); |
| 303 | |
| 304 | /* Check bfd format. */ |
| 305 | if (!bfd_check_format (abfd, bfd_object)) |
| 306 | { |
| 307 | bfd_close (abfd); |
| 308 | make_cleanup (xfree, found_pathname); |
| 309 | error (_("`%s': not in executable format: %s"), |
| 310 | found_pathname, bfd_errmsg (bfd_get_error ())); |
| 311 | } |
| 312 | |
| 313 | return abfd; |
| 314 | } |
| 315 | |
| 316 | |
| 317 | /* |
| 318 | |
| 319 | LOCAL FUNCTION |
| 320 | |
| 321 | solib_map_sections -- open bfd and build sections for shared lib |
| 322 | |
| 323 | SYNOPSIS |
| 324 | |
| 325 | static int solib_map_sections (struct so_list *so) |
| 326 | |
| 327 | DESCRIPTION |
| 328 | |
| 329 | Given a pointer to one of the shared objects in our list |
| 330 | of mapped objects, use the recorded name to open a bfd |
| 331 | descriptor for the object, build a section table, and then |
| 332 | relocate all the section addresses by the base address at |
| 333 | which the shared object was mapped. |
| 334 | |
| 335 | FIXMES |
| 336 | |
| 337 | In most (all?) cases the shared object file name recorded in the |
| 338 | dynamic linkage tables will be a fully qualified pathname. For |
| 339 | cases where it isn't, do we really mimic the systems search |
| 340 | mechanism correctly in the below code (particularly the tilde |
| 341 | expansion stuff?). |
| 342 | */ |
| 343 | |
| 344 | static int |
| 345 | solib_map_sections (void *arg) |
| 346 | { |
| 347 | struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */ |
| 348 | char *filename; |
| 349 | struct section_table *p; |
| 350 | struct cleanup *old_chain; |
| 351 | bfd *abfd; |
| 352 | |
| 353 | filename = tilde_expand (so->so_name); |
| 354 | old_chain = make_cleanup (xfree, filename); |
| 355 | abfd = solib_bfd_open (filename); |
| 356 | do_cleanups (old_chain); |
| 357 | |
| 358 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ |
| 359 | so->abfd = abfd; |
| 360 | |
| 361 | /* copy full path name into so_name, so that later symbol_file_add |
| 362 | can find it */ |
| 363 | if (strlen (bfd_get_filename (abfd)) >= SO_NAME_MAX_PATH_SIZE) |
| 364 | error (_("Shared library file name is too long.")); |
| 365 | strcpy (so->so_name, bfd_get_filename (abfd)); |
| 366 | |
| 367 | if (build_section_table (abfd, &so->sections, &so->sections_end)) |
| 368 | { |
| 369 | error (_("Can't find the file sections in `%s': %s"), |
| 370 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
| 371 | } |
| 372 | |
| 373 | for (p = so->sections; p < so->sections_end; p++) |
| 374 | { |
| 375 | struct target_so_ops *ops = solib_ops (target_gdbarch); |
| 376 | |
| 377 | /* Relocate the section binding addresses as recorded in the shared |
| 378 | object's file by the base address to which the object was actually |
| 379 | mapped. */ |
| 380 | ops->relocate_section_addresses (so, p); |
| 381 | |
| 382 | /* If the target didn't provide information about the address |
| 383 | range of the shared object, assume we want the location of |
| 384 | the .text section. */ |
| 385 | if (so->addr_low == 0 && so->addr_high == 0 |
| 386 | && strcmp (p->the_bfd_section->name, ".text") == 0) |
| 387 | { |
| 388 | so->addr_low = p->addr; |
| 389 | so->addr_high = p->endaddr; |
| 390 | } |
| 391 | } |
| 392 | |
| 393 | return (1); |
| 394 | } |
| 395 | |
| 396 | /* LOCAL FUNCTION |
| 397 | |
| 398 | free_so --- free a `struct so_list' object |
| 399 | |
| 400 | SYNOPSIS |
| 401 | |
| 402 | void free_so (struct so_list *so) |
| 403 | |
| 404 | DESCRIPTION |
| 405 | |
| 406 | Free the storage associated with the `struct so_list' object SO. |
| 407 | If we have opened a BFD for SO, close it. |
| 408 | |
| 409 | The caller is responsible for removing SO from whatever list it is |
| 410 | a member of. If we have placed SO's sections in some target's |
| 411 | section table, the caller is responsible for removing them. |
| 412 | |
| 413 | This function doesn't mess with objfiles at all. If there is an |
| 414 | objfile associated with SO that needs to be removed, the caller is |
| 415 | responsible for taking care of that. */ |
| 416 | |
| 417 | void |
| 418 | free_so (struct so_list *so) |
| 419 | { |
| 420 | struct target_so_ops *ops = solib_ops (target_gdbarch); |
| 421 | char *bfd_filename = 0; |
| 422 | |
| 423 | if (so->sections) |
| 424 | xfree (so->sections); |
| 425 | |
| 426 | if (so->abfd) |
| 427 | { |
| 428 | bfd_filename = bfd_get_filename (so->abfd); |
| 429 | if (! bfd_close (so->abfd)) |
| 430 | warning (_("cannot close \"%s\": %s"), |
| 431 | bfd_filename, bfd_errmsg (bfd_get_error ())); |
| 432 | } |
| 433 | |
| 434 | if (bfd_filename) |
| 435 | xfree (bfd_filename); |
| 436 | |
| 437 | ops->free_so (so); |
| 438 | |
| 439 | xfree (so); |
| 440 | } |
| 441 | |
| 442 | |
| 443 | /* Return address of first so_list entry in master shared object list. */ |
| 444 | struct so_list * |
| 445 | master_so_list (void) |
| 446 | { |
| 447 | return so_list_head; |
| 448 | } |
| 449 | |
| 450 | |
| 451 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
| 452 | |
| 453 | static int |
| 454 | symbol_add_stub (void *arg) |
| 455 | { |
| 456 | struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
| 457 | struct section_addr_info *sap; |
| 458 | |
| 459 | /* Have we already loaded this shared object? */ |
| 460 | ALL_OBJFILES (so->objfile) |
| 461 | { |
| 462 | if (strcmp (so->objfile->name, so->so_name) == 0) |
| 463 | return 1; |
| 464 | } |
| 465 | |
| 466 | sap = build_section_addr_info_from_section_table (so->sections, |
| 467 | so->sections_end); |
| 468 | |
| 469 | so->objfile = symbol_file_add_from_bfd (so->abfd, so->from_tty, |
| 470 | sap, 0, OBJF_SHARED | OBJF_KEEPBFD); |
| 471 | free_section_addr_info (sap); |
| 472 | |
| 473 | return (1); |
| 474 | } |
| 475 | |
| 476 | /* Read in symbols for shared object SO. If FROM_TTY is non-zero, be |
| 477 | chatty about it. Return non-zero if any symbols were actually |
| 478 | loaded. */ |
| 479 | |
| 480 | int |
| 481 | solib_read_symbols (struct so_list *so, int from_tty) |
| 482 | { |
| 483 | if (so->symbols_loaded) |
| 484 | { |
| 485 | if (from_tty) |
| 486 | printf_unfiltered (_("Symbols already loaded for %s\n"), so->so_name); |
| 487 | } |
| 488 | else if (so->abfd == NULL) |
| 489 | { |
| 490 | if (from_tty) |
| 491 | printf_unfiltered (_("Symbol file not found for %s\n"), so->so_name); |
| 492 | } |
| 493 | else |
| 494 | { |
| 495 | if (catch_errors (symbol_add_stub, so, |
| 496 | "Error while reading shared library symbols:\n", |
| 497 | RETURN_MASK_ALL)) |
| 498 | { |
| 499 | if (from_tty && print_symbol_loading) |
| 500 | printf_unfiltered (_("Loaded symbols for %s\n"), so->so_name); |
| 501 | so->symbols_loaded = 1; |
| 502 | return 1; |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | return 0; |
| 507 | } |
| 508 | |
| 509 | /* LOCAL FUNCTION |
| 510 | |
| 511 | update_solib_list --- synchronize GDB's shared object list with inferior's |
| 512 | |
| 513 | SYNOPSIS |
| 514 | |
| 515 | void update_solib_list (int from_tty, struct target_ops *TARGET) |
| 516 | |
| 517 | Extract the list of currently loaded shared objects from the |
| 518 | inferior, and compare it with the list of shared objects currently |
| 519 | in GDB's so_list_head list. Edit so_list_head to bring it in sync |
| 520 | with the inferior's new list. |
| 521 | |
| 522 | If we notice that the inferior has unloaded some shared objects, |
| 523 | free any symbolic info GDB had read about those shared objects. |
| 524 | |
| 525 | Don't load symbolic info for any new shared objects; just add them |
| 526 | to the list, and leave their symbols_loaded flag clear. |
| 527 | |
| 528 | If FROM_TTY is non-null, feel free to print messages about what |
| 529 | we're doing. |
| 530 | |
| 531 | If TARGET is non-null, add the sections of all new shared objects |
| 532 | to TARGET's section table. Note that this doesn't remove any |
| 533 | sections for shared objects that have been unloaded, and it |
| 534 | doesn't check to see if the new shared objects are already present in |
| 535 | the section table. But we only use this for core files and |
| 536 | processes we've just attached to, so that's okay. */ |
| 537 | |
| 538 | static void |
| 539 | update_solib_list (int from_tty, struct target_ops *target) |
| 540 | { |
| 541 | struct target_so_ops *ops = solib_ops (target_gdbarch); |
| 542 | struct so_list *inferior = ops->current_sos(); |
| 543 | struct so_list *gdb, **gdb_link; |
| 544 | |
| 545 | /* We can reach here due to changing solib-search-path or the |
| 546 | sysroot, before having any inferior. */ |
| 547 | if (target_has_execution && !ptid_equal (inferior_ptid, null_ptid)) |
| 548 | { |
| 549 | struct inferior *inf = current_inferior (); |
| 550 | |
| 551 | /* If we are attaching to a running process for which we |
| 552 | have not opened a symbol file, we may be able to get its |
| 553 | symbols now! */ |
| 554 | if (inf->attach_flag && symfile_objfile == NULL) |
| 555 | catch_errors (ops->open_symbol_file_object, &from_tty, |
| 556 | "Error reading attached process's symbol file.\n", |
| 557 | RETURN_MASK_ALL); |
| 558 | } |
| 559 | |
| 560 | /* GDB and the inferior's dynamic linker each maintain their own |
| 561 | list of currently loaded shared objects; we want to bring the |
| 562 | former in sync with the latter. Scan both lists, seeing which |
| 563 | shared objects appear where. There are three cases: |
| 564 | |
| 565 | - A shared object appears on both lists. This means that GDB |
| 566 | knows about it already, and it's still loaded in the inferior. |
| 567 | Nothing needs to happen. |
| 568 | |
| 569 | - A shared object appears only on GDB's list. This means that |
| 570 | the inferior has unloaded it. We should remove the shared |
| 571 | object from GDB's tables. |
| 572 | |
| 573 | - A shared object appears only on the inferior's list. This |
| 574 | means that it's just been loaded. We should add it to GDB's |
| 575 | tables. |
| 576 | |
| 577 | So we walk GDB's list, checking each entry to see if it appears |
| 578 | in the inferior's list too. If it does, no action is needed, and |
| 579 | we remove it from the inferior's list. If it doesn't, the |
| 580 | inferior has unloaded it, and we remove it from GDB's list. By |
| 581 | the time we're done walking GDB's list, the inferior's list |
| 582 | contains only the new shared objects, which we then add. */ |
| 583 | |
| 584 | gdb = so_list_head; |
| 585 | gdb_link = &so_list_head; |
| 586 | while (gdb) |
| 587 | { |
| 588 | struct so_list *i = inferior; |
| 589 | struct so_list **i_link = &inferior; |
| 590 | |
| 591 | /* Check to see whether the shared object *gdb also appears in |
| 592 | the inferior's current list. */ |
| 593 | while (i) |
| 594 | { |
| 595 | if (ops->same) |
| 596 | { |
| 597 | if (ops->same (gdb, i)) |
| 598 | break; |
| 599 | } |
| 600 | else |
| 601 | { |
| 602 | if (! strcmp (gdb->so_original_name, i->so_original_name)) |
| 603 | break; |
| 604 | } |
| 605 | |
| 606 | i_link = &i->next; |
| 607 | i = *i_link; |
| 608 | } |
| 609 | |
| 610 | /* If the shared object appears on the inferior's list too, then |
| 611 | it's still loaded, so we don't need to do anything. Delete |
| 612 | it from the inferior's list, and leave it on GDB's list. */ |
| 613 | if (i) |
| 614 | { |
| 615 | *i_link = i->next; |
| 616 | free_so (i); |
| 617 | gdb_link = &gdb->next; |
| 618 | gdb = *gdb_link; |
| 619 | } |
| 620 | |
| 621 | /* If it's not on the inferior's list, remove it from GDB's tables. */ |
| 622 | else |
| 623 | { |
| 624 | /* Notify any observer that the shared object has been |
| 625 | unloaded before we remove it from GDB's tables. */ |
| 626 | observer_notify_solib_unloaded (gdb); |
| 627 | |
| 628 | *gdb_link = gdb->next; |
| 629 | |
| 630 | /* Unless the user loaded it explicitly, free SO's objfile. */ |
| 631 | if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED)) |
| 632 | free_objfile (gdb->objfile); |
| 633 | |
| 634 | /* Some targets' section tables might be referring to |
| 635 | sections from so->abfd; remove them. */ |
| 636 | remove_target_sections (gdb->abfd); |
| 637 | |
| 638 | free_so (gdb); |
| 639 | gdb = *gdb_link; |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | /* Now the inferior's list contains only shared objects that don't |
| 644 | appear in GDB's list --- those that are newly loaded. Add them |
| 645 | to GDB's shared object list. */ |
| 646 | if (inferior) |
| 647 | { |
| 648 | struct so_list *i; |
| 649 | |
| 650 | /* Add the new shared objects to GDB's list. */ |
| 651 | *gdb_link = inferior; |
| 652 | |
| 653 | /* Fill in the rest of each of the `struct so_list' nodes. */ |
| 654 | for (i = inferior; i; i = i->next) |
| 655 | { |
| 656 | i->from_tty = from_tty; |
| 657 | |
| 658 | /* Fill in the rest of the `struct so_list' node. */ |
| 659 | catch_errors (solib_map_sections, i, |
| 660 | "Error while mapping shared library sections:\n", |
| 661 | RETURN_MASK_ALL); |
| 662 | |
| 663 | /* If requested, add the shared object's sections to the TARGET's |
| 664 | section table. Do this immediately after mapping the object so |
| 665 | that later nodes in the list can query this object, as is needed |
| 666 | in solib-osf.c. */ |
| 667 | if (target) |
| 668 | { |
| 669 | int count = (i->sections_end - i->sections); |
| 670 | if (count > 0) |
| 671 | { |
| 672 | int space = target_resize_to_sections (target, count); |
| 673 | memcpy (target->to_sections + space, |
| 674 | i->sections, |
| 675 | count * sizeof (i->sections[0])); |
| 676 | } |
| 677 | } |
| 678 | |
| 679 | /* Notify any observer that the shared object has been |
| 680 | loaded now that we've added it to GDB's tables. */ |
| 681 | observer_notify_solib_loaded (i); |
| 682 | } |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | /* Return non-zero if SO is the libpthread shared library. |
| 687 | |
| 688 | Uses a fairly simplistic heuristic approach where we check |
| 689 | the file name against "/libpthread". This can lead to false |
| 690 | positives, but this should be good enough in practice. */ |
| 691 | |
| 692 | static int |
| 693 | libpthread_solib_p (struct so_list *so) |
| 694 | { |
| 695 | return (strstr (so->so_name, "/libpthread") != NULL); |
| 696 | } |
| 697 | |
| 698 | /* GLOBAL FUNCTION |
| 699 | |
| 700 | solib_add -- read in symbol info for newly added shared libraries |
| 701 | |
| 702 | SYNOPSIS |
| 703 | |
| 704 | void solib_add (char *pattern, int from_tty, struct target_ops |
| 705 | *TARGET, int readsyms) |
| 706 | |
| 707 | DESCRIPTION |
| 708 | |
| 709 | Read in symbolic information for any shared objects whose names |
| 710 | match PATTERN. (If we've already read a shared object's symbol |
| 711 | info, leave it alone.) If PATTERN is zero, read them all. |
| 712 | |
| 713 | If READSYMS is 0, defer reading symbolic information until later |
| 714 | but still do any needed low level processing. |
| 715 | |
| 716 | FROM_TTY and TARGET are as described for update_solib_list, above. */ |
| 717 | |
| 718 | void |
| 719 | solib_add (char *pattern, int from_tty, struct target_ops *target, int readsyms) |
| 720 | { |
| 721 | struct so_list *gdb; |
| 722 | |
| 723 | if (pattern) |
| 724 | { |
| 725 | char *re_err = re_comp (pattern); |
| 726 | |
| 727 | if (re_err) |
| 728 | error (_("Invalid regexp: %s"), re_err); |
| 729 | } |
| 730 | |
| 731 | update_solib_list (from_tty, target); |
| 732 | |
| 733 | /* Walk the list of currently loaded shared libraries, and read |
| 734 | symbols for any that match the pattern --- or any whose symbols |
| 735 | aren't already loaded, if no pattern was given. */ |
| 736 | { |
| 737 | int any_matches = 0; |
| 738 | int loaded_any_symbols = 0; |
| 739 | |
| 740 | for (gdb = so_list_head; gdb; gdb = gdb->next) |
| 741 | if (! pattern || re_exec (gdb->so_name)) |
| 742 | { |
| 743 | /* Normally, we would read the symbols from that library |
| 744 | only if READSYMS is set. However, we're making a small |
| 745 | exception for the pthread library, because we sometimes |
| 746 | need the library symbols to be loaded in order to provide |
| 747 | thread support (x86-linux for instance). */ |
| 748 | const int add_this_solib = |
| 749 | (readsyms || libpthread_solib_p (gdb)); |
| 750 | |
| 751 | any_matches = 1; |
| 752 | if (add_this_solib && solib_read_symbols (gdb, from_tty)) |
| 753 | loaded_any_symbols = 1; |
| 754 | } |
| 755 | |
| 756 | if (from_tty && pattern && ! any_matches) |
| 757 | printf_unfiltered |
| 758 | ("No loaded shared libraries match the pattern `%s'.\n", pattern); |
| 759 | |
| 760 | if (loaded_any_symbols) |
| 761 | { |
| 762 | struct target_so_ops *ops = solib_ops (target_gdbarch); |
| 763 | |
| 764 | /* Getting new symbols may change our opinion about what is |
| 765 | frameless. */ |
| 766 | reinit_frame_cache (); |
| 767 | |
| 768 | ops->special_symbol_handling (); |
| 769 | } |
| 770 | } |
| 771 | } |
| 772 | |
| 773 | |
| 774 | /* |
| 775 | |
| 776 | LOCAL FUNCTION |
| 777 | |
| 778 | info_sharedlibrary_command -- code for "info sharedlibrary" |
| 779 | |
| 780 | SYNOPSIS |
| 781 | |
| 782 | static void info_sharedlibrary_command () |
| 783 | |
| 784 | DESCRIPTION |
| 785 | |
| 786 | Walk through the shared library list and print information |
| 787 | about each attached library. |
| 788 | */ |
| 789 | |
| 790 | static void |
| 791 | info_sharedlibrary_command (char *ignore, int from_tty) |
| 792 | { |
| 793 | struct so_list *so = NULL; /* link map state variable */ |
| 794 | int header_done = 0; |
| 795 | int addr_width; |
| 796 | |
| 797 | /* "0x", a little whitespace, and two hex digits per byte of pointers. */ |
| 798 | addr_width = 4 + (gdbarch_ptr_bit (target_gdbarch) / 4); |
| 799 | |
| 800 | update_solib_list (from_tty, 0); |
| 801 | |
| 802 | for (so = so_list_head; so; so = so->next) |
| 803 | { |
| 804 | if (so->so_name[0]) |
| 805 | { |
| 806 | if (!header_done) |
| 807 | { |
| 808 | printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From", |
| 809 | addr_width, "To", "Syms Read", |
| 810 | "Shared Object Library"); |
| 811 | header_done++; |
| 812 | } |
| 813 | |
| 814 | printf_unfiltered ("%-*s", addr_width, |
| 815 | so->addr_high != 0 |
| 816 | ? hex_string_custom ( |
| 817 | (LONGEST) so->addr_low, |
| 818 | addr_width - 4) |
| 819 | : ""); |
| 820 | printf_unfiltered ("%-*s", addr_width, |
| 821 | so->addr_high != 0 |
| 822 | ? hex_string_custom ( |
| 823 | (LONGEST) so->addr_high, |
| 824 | addr_width - 4) |
| 825 | : ""); |
| 826 | printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No"); |
| 827 | printf_unfiltered ("%s\n", so->so_name); |
| 828 | } |
| 829 | } |
| 830 | if (so_list_head == NULL) |
| 831 | { |
| 832 | printf_unfiltered (_("No shared libraries loaded at this time.\n")); |
| 833 | } |
| 834 | } |
| 835 | |
| 836 | /* |
| 837 | |
| 838 | GLOBAL FUNCTION |
| 839 | |
| 840 | solib_address -- check to see if an address is in a shared lib |
| 841 | |
| 842 | SYNOPSIS |
| 843 | |
| 844 | char * solib_address (CORE_ADDR address) |
| 845 | |
| 846 | DESCRIPTION |
| 847 | |
| 848 | Provides a hook for other gdb routines to discover whether or |
| 849 | not a particular address is within the mapped address space of |
| 850 | a shared library. |
| 851 | |
| 852 | For example, this routine is called at one point to disable |
| 853 | breakpoints which are in shared libraries that are not currently |
| 854 | mapped in. |
| 855 | */ |
| 856 | |
| 857 | char * |
| 858 | solib_address (CORE_ADDR address) |
| 859 | { |
| 860 | struct so_list *so = 0; /* link map state variable */ |
| 861 | |
| 862 | for (so = so_list_head; so; so = so->next) |
| 863 | { |
| 864 | struct section_table *p; |
| 865 | |
| 866 | for (p = so->sections; p < so->sections_end; p++) |
| 867 | { |
| 868 | if (p->addr <= address && address < p->endaddr) |
| 869 | return (so->so_name); |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | return (0); |
| 874 | } |
| 875 | |
| 876 | /* Called by free_all_symtabs */ |
| 877 | |
| 878 | void |
| 879 | clear_solib (void) |
| 880 | { |
| 881 | struct target_so_ops *ops = solib_ops (target_gdbarch); |
| 882 | |
| 883 | /* This function is expected to handle ELF shared libraries. It is |
| 884 | also used on Solaris, which can run either ELF or a.out binaries |
| 885 | (for compatibility with SunOS 4), both of which can use shared |
| 886 | libraries. So we don't know whether we have an ELF executable or |
| 887 | an a.out executable until the user chooses an executable file. |
| 888 | |
| 889 | ELF shared libraries don't get mapped into the address space |
| 890 | until after the program starts, so we'd better not try to insert |
| 891 | breakpoints in them immediately. We have to wait until the |
| 892 | dynamic linker has loaded them; we'll hit a bp_shlib_event |
| 893 | breakpoint (look for calls to create_solib_event_breakpoint) when |
| 894 | it's ready. |
| 895 | |
| 896 | SunOS shared libraries seem to be different --- they're present |
| 897 | as soon as the process begins execution, so there's no need to |
| 898 | put off inserting breakpoints. There's also nowhere to put a |
| 899 | bp_shlib_event breakpoint, so if we put it off, we'll never get |
| 900 | around to it. |
| 901 | |
| 902 | So: disable breakpoints only if we're using ELF shared libs. */ |
| 903 | if (exec_bfd != NULL |
| 904 | && bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour) |
| 905 | disable_breakpoints_in_shlibs (); |
| 906 | |
| 907 | while (so_list_head) |
| 908 | { |
| 909 | struct so_list *so = so_list_head; |
| 910 | so_list_head = so->next; |
| 911 | if (so->abfd) |
| 912 | remove_target_sections (so->abfd); |
| 913 | free_so (so); |
| 914 | } |
| 915 | |
| 916 | ops->clear_solib (); |
| 917 | } |
| 918 | |
| 919 | /* GLOBAL FUNCTION |
| 920 | |
| 921 | solib_create_inferior_hook -- shared library startup support |
| 922 | |
| 923 | SYNOPSIS |
| 924 | |
| 925 | void solib_create_inferior_hook () |
| 926 | |
| 927 | DESCRIPTION |
| 928 | |
| 929 | When gdb starts up the inferior, it nurses it along (through the |
| 930 | shell) until it is ready to execute it's first instruction. At this |
| 931 | point, this function gets called via expansion of the macro |
| 932 | SOLIB_CREATE_INFERIOR_HOOK. */ |
| 933 | |
| 934 | void |
| 935 | solib_create_inferior_hook (void) |
| 936 | { |
| 937 | struct target_so_ops *ops = solib_ops (target_gdbarch); |
| 938 | ops->solib_create_inferior_hook(); |
| 939 | } |
| 940 | |
| 941 | /* GLOBAL FUNCTION |
| 942 | |
| 943 | in_solib_dynsym_resolve_code -- check to see if an address is in |
| 944 | dynamic loader's dynamic symbol |
| 945 | resolution code |
| 946 | |
| 947 | SYNOPSIS |
| 948 | |
| 949 | int in_solib_dynsym_resolve_code (CORE_ADDR pc) |
| 950 | |
| 951 | DESCRIPTION |
| 952 | |
| 953 | Determine if PC is in the dynamic linker's symbol resolution |
| 954 | code. Return 1 if so, 0 otherwise. |
| 955 | */ |
| 956 | |
| 957 | int |
| 958 | in_solib_dynsym_resolve_code (CORE_ADDR pc) |
| 959 | { |
| 960 | struct target_so_ops *ops = solib_ops (target_gdbarch); |
| 961 | return ops->in_dynsym_resolve_code (pc); |
| 962 | } |
| 963 | |
| 964 | /* |
| 965 | |
| 966 | LOCAL FUNCTION |
| 967 | |
| 968 | sharedlibrary_command -- handle command to explicitly add library |
| 969 | |
| 970 | SYNOPSIS |
| 971 | |
| 972 | static void sharedlibrary_command (char *args, int from_tty) |
| 973 | |
| 974 | DESCRIPTION |
| 975 | |
| 976 | */ |
| 977 | |
| 978 | static void |
| 979 | sharedlibrary_command (char *args, int from_tty) |
| 980 | { |
| 981 | dont_repeat (); |
| 982 | solib_add (args, from_tty, (struct target_ops *) 0, 1); |
| 983 | } |
| 984 | |
| 985 | /* LOCAL FUNCTION |
| 986 | |
| 987 | no_shared_libraries -- handle command to explicitly discard symbols |
| 988 | from shared libraries. |
| 989 | |
| 990 | DESCRIPTION |
| 991 | |
| 992 | Implements the command "nosharedlibrary", which discards symbols |
| 993 | that have been auto-loaded from shared libraries. Symbols from |
| 994 | shared libraries that were added by explicit request of the user |
| 995 | are not discarded. Also called from remote.c. */ |
| 996 | |
| 997 | void |
| 998 | no_shared_libraries (char *ignored, int from_tty) |
| 999 | { |
| 1000 | objfile_purge_solibs (); |
| 1001 | clear_solib (); |
| 1002 | } |
| 1003 | |
| 1004 | static void |
| 1005 | reload_shared_libraries (char *ignored, int from_tty, |
| 1006 | struct cmd_list_element *e) |
| 1007 | { |
| 1008 | no_shared_libraries (NULL, from_tty); |
| 1009 | solib_add (NULL, from_tty, NULL, auto_solib_add); |
| 1010 | } |
| 1011 | |
| 1012 | static void |
| 1013 | show_auto_solib_add (struct ui_file *file, int from_tty, |
| 1014 | struct cmd_list_element *c, const char *value) |
| 1015 | { |
| 1016 | fprintf_filtered (file, _("Autoloading of shared library symbols is %s.\n"), |
| 1017 | value); |
| 1018 | } |
| 1019 | |
| 1020 | |
| 1021 | /* Handler for library-specific lookup of global symbol NAME in OBJFILE. Call |
| 1022 | the library-specific handler if it is installed for the current target. */ |
| 1023 | |
| 1024 | struct symbol * |
| 1025 | solib_global_lookup (const struct objfile *objfile, |
| 1026 | const char *name, |
| 1027 | const char *linkage_name, |
| 1028 | const domain_enum domain) |
| 1029 | { |
| 1030 | struct target_so_ops *ops = solib_ops (target_gdbarch); |
| 1031 | |
| 1032 | if (ops->lookup_lib_global_symbol != NULL) |
| 1033 | return ops->lookup_lib_global_symbol (objfile, name, linkage_name, domain); |
| 1034 | return NULL; |
| 1035 | } |
| 1036 | |
| 1037 | |
| 1038 | extern initialize_file_ftype _initialize_solib; /* -Wmissing-prototypes */ |
| 1039 | |
| 1040 | void |
| 1041 | _initialize_solib (void) |
| 1042 | { |
| 1043 | struct cmd_list_element *c; |
| 1044 | |
| 1045 | solib_data = gdbarch_data_register_pre_init (solib_init); |
| 1046 | |
| 1047 | add_com ("sharedlibrary", class_files, sharedlibrary_command, |
| 1048 | _("Load shared object library symbols for files matching REGEXP.")); |
| 1049 | add_info ("sharedlibrary", info_sharedlibrary_command, |
| 1050 | _("Status of loaded shared object libraries.")); |
| 1051 | add_com ("nosharedlibrary", class_files, no_shared_libraries, |
| 1052 | _("Unload all shared object library symbols.")); |
| 1053 | |
| 1054 | add_setshow_boolean_cmd ("auto-solib-add", class_support, |
| 1055 | &auto_solib_add, _("\ |
| 1056 | Set autoloading of shared library symbols."), _("\ |
| 1057 | Show autoloading of shared library symbols."), _("\ |
| 1058 | If \"on\", symbols from all shared object libraries will be loaded\n\ |
| 1059 | automatically when the inferior begins execution, when the dynamic linker\n\ |
| 1060 | informs gdb that a new library has been loaded, or when attaching to the\n\ |
| 1061 | inferior. Otherwise, symbols must be loaded manually, using `sharedlibrary'."), |
| 1062 | NULL, |
| 1063 | show_auto_solib_add, |
| 1064 | &setlist, &showlist); |
| 1065 | |
| 1066 | add_setshow_filename_cmd ("sysroot", class_support, |
| 1067 | &gdb_sysroot, _("\ |
| 1068 | Set an alternate system root."), _("\ |
| 1069 | Show the current system root."), _("\ |
| 1070 | The system root is used to load absolute shared library symbol files.\n\ |
| 1071 | For other (relative) files, you can add directories using\n\ |
| 1072 | `set solib-search-path'."), |
| 1073 | reload_shared_libraries, |
| 1074 | NULL, |
| 1075 | &setlist, &showlist); |
| 1076 | |
| 1077 | add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0, |
| 1078 | &setlist); |
| 1079 | add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0, |
| 1080 | &showlist); |
| 1081 | |
| 1082 | add_setshow_optional_filename_cmd ("solib-search-path", class_support, |
| 1083 | &solib_search_path, _("\ |
| 1084 | Set the search path for loading non-absolute shared library symbol files."), _("\ |
| 1085 | Show the search path for loading non-absolute shared library symbol files."), _("\ |
| 1086 | This takes precedence over the environment variables PATH and LD_LIBRARY_PATH."), |
| 1087 | reload_shared_libraries, |
| 1088 | show_solib_search_path, |
| 1089 | &setlist, &showlist); |
| 1090 | } |