| 1 | /* Handle shared libraries for GDB, the GNU Debugger. |
| 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 3 | 2000, 2001 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | |
| 25 | #include <sys/types.h> |
| 26 | #include <fcntl.h> |
| 27 | #include "gdb_string.h" |
| 28 | #include "symtab.h" |
| 29 | #include "bfd.h" |
| 30 | #include "symfile.h" |
| 31 | #include "objfiles.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 | |
| 43 | #include "solist.h" |
| 44 | |
| 45 | /* external data declarations */ |
| 46 | |
| 47 | /* FIXME: gdbarch needs to control this variable */ |
| 48 | struct target_so_ops *current_target_so_ops; |
| 49 | |
| 50 | /* local data declarations */ |
| 51 | |
| 52 | static struct so_list *so_list_head; /* List of known shared objects */ |
| 53 | |
| 54 | static int solib_cleanup_queued = 0; /* make_run_cleanup called */ |
| 55 | |
| 56 | /* Local function prototypes */ |
| 57 | |
| 58 | static void do_clear_solib (PTR); |
| 59 | |
| 60 | /* If non-zero, this is a prefix that will be added to the front of the name |
| 61 | shared libraries with an absolute filename for loading. */ |
| 62 | static char *solib_absolute_prefix = NULL; |
| 63 | |
| 64 | /* If non-empty, this is a search path for loading non-absolute shared library |
| 65 | symbol files. This takes precedence over the environment variables PATH |
| 66 | and LD_LIBRARY_PATH. */ |
| 67 | static char *solib_search_path = NULL; |
| 68 | |
| 69 | /* |
| 70 | |
| 71 | GLOBAL FUNCTION |
| 72 | |
| 73 | solib_open -- Find a shared library file and open it. |
| 74 | |
| 75 | SYNOPSIS |
| 76 | |
| 77 | int solib_open (char *in_patname, char **found_pathname); |
| 78 | |
| 79 | DESCRIPTION |
| 80 | |
| 81 | Global variable SOLIB_ABSOLUTE_PREFIX is used as a prefix directory |
| 82 | to search for shared libraries if they have an absolute path. |
| 83 | |
| 84 | Global variable SOLIB_SEARCH_PATH is used as a prefix directory |
| 85 | (or set of directories, as in LD_LIBRARY_PATH) to search for all |
| 86 | shared libraries if not found in SOLIB_ABSOLUTE_PREFIX. |
| 87 | |
| 88 | Search order: |
| 89 | * If path is absolute, look in SOLIB_ABSOLUTE_PREFIX. |
| 90 | * If path is absolute or relative, look for it literally (unmodified). |
| 91 | * Look in SOLIB_SEARCH_PATH. |
| 92 | * Look in inferior's $PATH. |
| 93 | * Look in inferior's $LD_LIBRARY_PATH. |
| 94 | |
| 95 | RETURNS |
| 96 | |
| 97 | file handle for opened solib, or -1 for failure. */ |
| 98 | |
| 99 | int |
| 100 | solib_open (char *in_pathname, char **found_pathname) |
| 101 | { |
| 102 | int found_file = -1; |
| 103 | char *temp_pathname = NULL; |
| 104 | |
| 105 | if (strchr (in_pathname, SLASH_CHAR)) |
| 106 | { |
| 107 | if (! ROOTED_P (in_pathname) || solib_absolute_prefix == NULL) |
| 108 | temp_pathname = in_pathname; |
| 109 | else |
| 110 | { |
| 111 | int prefix_len = strlen (solib_absolute_prefix); |
| 112 | |
| 113 | /* Remove trailing slashes from absolute prefix. */ |
| 114 | while (prefix_len > 0 |
| 115 | && SLASH_P (solib_absolute_prefix[prefix_len - 1])) |
| 116 | prefix_len--; |
| 117 | |
| 118 | /* Cat the prefixed pathname together. */ |
| 119 | temp_pathname = alloca (prefix_len + strlen (in_pathname) + 1); |
| 120 | strncpy (temp_pathname, solib_absolute_prefix, prefix_len); |
| 121 | temp_pathname[prefix_len] = '\0'; |
| 122 | strcat (temp_pathname, in_pathname); |
| 123 | } |
| 124 | |
| 125 | /* Now see if we can open it. */ |
| 126 | found_file = open (temp_pathname, O_RDONLY, 0); |
| 127 | } |
| 128 | |
| 129 | /* If not found, next search the solib_search_path (if any). */ |
| 130 | if (found_file < 0 && solib_search_path != NULL) |
| 131 | found_file = openp (solib_search_path, |
| 132 | 1, in_pathname, O_RDONLY, 0, &temp_pathname); |
| 133 | |
| 134 | /* If not found, next search the inferior's $PATH environment variable. */ |
| 135 | if (found_file < 0 && solib_search_path != NULL) |
| 136 | found_file = openp (get_in_environ (inferior_environ, "PATH"), |
| 137 | 1, in_pathname, O_RDONLY, 0, &temp_pathname); |
| 138 | |
| 139 | /* If not found, next search the inferior's $LD_LIBRARY_PATH |
| 140 | environment variable. */ |
| 141 | if (found_file < 0 && solib_search_path != NULL) |
| 142 | found_file = openp (get_in_environ (inferior_environ, "LD_LIBRARY_PATH"), |
| 143 | 1, in_pathname, O_RDONLY, 0, &temp_pathname); |
| 144 | |
| 145 | /* Done. If not found, tough luck. Return found_file and |
| 146 | (optionally) found_pathname. */ |
| 147 | if (found_pathname != NULL && temp_pathname != NULL) |
| 148 | *found_pathname = xstrdup (temp_pathname); |
| 149 | return found_file; |
| 150 | } |
| 151 | |
| 152 | |
| 153 | /* |
| 154 | |
| 155 | LOCAL FUNCTION |
| 156 | |
| 157 | solib_map_sections -- open bfd and build sections for shared lib |
| 158 | |
| 159 | SYNOPSIS |
| 160 | |
| 161 | static int solib_map_sections (struct so_list *so) |
| 162 | |
| 163 | DESCRIPTION |
| 164 | |
| 165 | Given a pointer to one of the shared objects in our list |
| 166 | of mapped objects, use the recorded name to open a bfd |
| 167 | descriptor for the object, build a section table, and then |
| 168 | relocate all the section addresses by the base address at |
| 169 | which the shared object was mapped. |
| 170 | |
| 171 | FIXMES |
| 172 | |
| 173 | In most (all?) cases the shared object file name recorded in the |
| 174 | dynamic linkage tables will be a fully qualified pathname. For |
| 175 | cases where it isn't, do we really mimic the systems search |
| 176 | mechanism correctly in the below code (particularly the tilde |
| 177 | expansion stuff?). |
| 178 | */ |
| 179 | |
| 180 | static int |
| 181 | solib_map_sections (PTR arg) |
| 182 | { |
| 183 | struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */ |
| 184 | char *filename; |
| 185 | char *scratch_pathname; |
| 186 | int scratch_chan; |
| 187 | struct section_table *p; |
| 188 | struct cleanup *old_chain; |
| 189 | bfd *abfd; |
| 190 | |
| 191 | filename = tilde_expand (so->so_name); |
| 192 | |
| 193 | old_chain = make_cleanup (xfree, filename); |
| 194 | scratch_chan = solib_open (filename, &scratch_pathname); |
| 195 | |
| 196 | if (scratch_chan < 0) |
| 197 | { |
| 198 | perror_with_name (filename); |
| 199 | } |
| 200 | |
| 201 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ |
| 202 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); |
| 203 | if (!abfd) |
| 204 | { |
| 205 | close (scratch_chan); |
| 206 | error ("Could not open `%s' as an executable file: %s", |
| 207 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
| 208 | } |
| 209 | |
| 210 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ |
| 211 | so->abfd = abfd; |
| 212 | abfd->cacheable = true; |
| 213 | |
| 214 | /* copy full path name into so_name, so that later symbol_file_add |
| 215 | can find it */ |
| 216 | if (strlen (scratch_pathname) >= SO_NAME_MAX_PATH_SIZE) |
| 217 | error ("Full path name length of shared library exceeds SO_NAME_MAX_PATH_SIZE in so_list structure."); |
| 218 | strcpy (so->so_name, scratch_pathname); |
| 219 | |
| 220 | if (!bfd_check_format (abfd, bfd_object)) |
| 221 | { |
| 222 | error ("\"%s\": not in executable format: %s.", |
| 223 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
| 224 | } |
| 225 | if (build_section_table (abfd, &so->sections, &so->sections_end)) |
| 226 | { |
| 227 | error ("Can't find the file sections in `%s': %s", |
| 228 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
| 229 | } |
| 230 | |
| 231 | for (p = so->sections; p < so->sections_end; p++) |
| 232 | { |
| 233 | /* Relocate the section binding addresses as recorded in the shared |
| 234 | object's file by the base address to which the object was actually |
| 235 | mapped. */ |
| 236 | TARGET_SO_RELOCATE_SECTION_ADDRESSES (so, p); |
| 237 | if (STREQ (p->the_bfd_section->name, ".text")) |
| 238 | { |
| 239 | so->textsection = p; |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | /* Free the file names, close the file now. */ |
| 244 | do_cleanups (old_chain); |
| 245 | |
| 246 | return (1); |
| 247 | } |
| 248 | |
| 249 | /* LOCAL FUNCTION |
| 250 | |
| 251 | free_so --- free a `struct so_list' object |
| 252 | |
| 253 | SYNOPSIS |
| 254 | |
| 255 | void free_so (struct so_list *so) |
| 256 | |
| 257 | DESCRIPTION |
| 258 | |
| 259 | Free the storage associated with the `struct so_list' object SO. |
| 260 | If we have opened a BFD for SO, close it. |
| 261 | |
| 262 | The caller is responsible for removing SO from whatever list it is |
| 263 | a member of. If we have placed SO's sections in some target's |
| 264 | section table, the caller is responsible for removing them. |
| 265 | |
| 266 | This function doesn't mess with objfiles at all. If there is an |
| 267 | objfile associated with SO that needs to be removed, the caller is |
| 268 | responsible for taking care of that. */ |
| 269 | |
| 270 | void |
| 271 | free_so (struct so_list *so) |
| 272 | { |
| 273 | char *bfd_filename = 0; |
| 274 | |
| 275 | if (so->sections) |
| 276 | xfree (so->sections); |
| 277 | |
| 278 | if (so->abfd) |
| 279 | { |
| 280 | bfd_filename = bfd_get_filename (so->abfd); |
| 281 | if (! bfd_close (so->abfd)) |
| 282 | warning ("cannot close \"%s\": %s", |
| 283 | bfd_filename, bfd_errmsg (bfd_get_error ())); |
| 284 | } |
| 285 | |
| 286 | if (bfd_filename) |
| 287 | xfree (bfd_filename); |
| 288 | |
| 289 | TARGET_SO_FREE_SO (so); |
| 290 | |
| 291 | xfree (so); |
| 292 | } |
| 293 | |
| 294 | |
| 295 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
| 296 | |
| 297 | static int |
| 298 | symbol_add_stub (PTR arg) |
| 299 | { |
| 300 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
| 301 | struct section_addr_info *sap; |
| 302 | |
| 303 | /* Have we already loaded this shared object? */ |
| 304 | ALL_OBJFILES (so->objfile) |
| 305 | { |
| 306 | if (strcmp (so->objfile->name, so->so_name) == 0) |
| 307 | return 1; |
| 308 | } |
| 309 | |
| 310 | sap = build_section_addr_info_from_section_table (so->sections, |
| 311 | so->sections_end); |
| 312 | |
| 313 | so->objfile = symbol_file_add (so->so_name, so->from_tty, |
| 314 | sap, 0, OBJF_SHARED); |
| 315 | free_section_addr_info (sap); |
| 316 | |
| 317 | return (1); |
| 318 | } |
| 319 | |
| 320 | |
| 321 | /* LOCAL FUNCTION |
| 322 | |
| 323 | update_solib_list --- synchronize GDB's shared object list with inferior's |
| 324 | |
| 325 | SYNOPSIS |
| 326 | |
| 327 | void update_solib_list (int from_tty, struct target_ops *TARGET) |
| 328 | |
| 329 | Extract the list of currently loaded shared objects from the |
| 330 | inferior, and compare it with the list of shared objects currently |
| 331 | in GDB's so_list_head list. Edit so_list_head to bring it in sync |
| 332 | with the inferior's new list. |
| 333 | |
| 334 | If we notice that the inferior has unloaded some shared objects, |
| 335 | free any symbolic info GDB had read about those shared objects. |
| 336 | |
| 337 | Don't load symbolic info for any new shared objects; just add them |
| 338 | to the list, and leave their symbols_loaded flag clear. |
| 339 | |
| 340 | If FROM_TTY is non-null, feel free to print messages about what |
| 341 | we're doing. |
| 342 | |
| 343 | If TARGET is non-null, add the sections of all new shared objects |
| 344 | to TARGET's section table. Note that this doesn't remove any |
| 345 | sections for shared objects that have been unloaded, and it |
| 346 | doesn't check to see if the new shared objects are already present in |
| 347 | the section table. But we only use this for core files and |
| 348 | processes we've just attached to, so that's okay. */ |
| 349 | |
| 350 | void |
| 351 | update_solib_list (int from_tty, struct target_ops *target) |
| 352 | { |
| 353 | struct so_list *inferior = TARGET_SO_CURRENT_SOS (); |
| 354 | struct so_list *gdb, **gdb_link; |
| 355 | |
| 356 | /* If we are attaching to a running process for which we |
| 357 | have not opened a symbol file, we may be able to get its |
| 358 | symbols now! */ |
| 359 | if (attach_flag && |
| 360 | symfile_objfile == NULL) |
| 361 | catch_errors (TARGET_SO_OPEN_SYMBOL_FILE_OBJECT, (PTR) &from_tty, |
| 362 | "Error reading attached process's symbol file.\n", |
| 363 | RETURN_MASK_ALL); |
| 364 | |
| 365 | /* Since this function might actually add some elements to the |
| 366 | so_list_head list, arrange for it to be cleaned up when |
| 367 | appropriate. */ |
| 368 | if (!solib_cleanup_queued) |
| 369 | { |
| 370 | make_run_cleanup (do_clear_solib, NULL); |
| 371 | solib_cleanup_queued = 1; |
| 372 | } |
| 373 | |
| 374 | /* GDB and the inferior's dynamic linker each maintain their own |
| 375 | list of currently loaded shared objects; we want to bring the |
| 376 | former in sync with the latter. Scan both lists, seeing which |
| 377 | shared objects appear where. There are three cases: |
| 378 | |
| 379 | - A shared object appears on both lists. This means that GDB |
| 380 | knows about it already, and it's still loaded in the inferior. |
| 381 | Nothing needs to happen. |
| 382 | |
| 383 | - A shared object appears only on GDB's list. This means that |
| 384 | the inferior has unloaded it. We should remove the shared |
| 385 | object from GDB's tables. |
| 386 | |
| 387 | - A shared object appears only on the inferior's list. This |
| 388 | means that it's just been loaded. We should add it to GDB's |
| 389 | tables. |
| 390 | |
| 391 | So we walk GDB's list, checking each entry to see if it appears |
| 392 | in the inferior's list too. If it does, no action is needed, and |
| 393 | we remove it from the inferior's list. If it doesn't, the |
| 394 | inferior has unloaded it, and we remove it from GDB's list. By |
| 395 | the time we're done walking GDB's list, the inferior's list |
| 396 | contains only the new shared objects, which we then add. */ |
| 397 | |
| 398 | gdb = so_list_head; |
| 399 | gdb_link = &so_list_head; |
| 400 | while (gdb) |
| 401 | { |
| 402 | struct so_list *i = inferior; |
| 403 | struct so_list **i_link = &inferior; |
| 404 | |
| 405 | /* Check to see whether the shared object *gdb also appears in |
| 406 | the inferior's current list. */ |
| 407 | while (i) |
| 408 | { |
| 409 | if (! strcmp (gdb->so_original_name, i->so_original_name)) |
| 410 | break; |
| 411 | |
| 412 | i_link = &i->next; |
| 413 | i = *i_link; |
| 414 | } |
| 415 | |
| 416 | /* If the shared object appears on the inferior's list too, then |
| 417 | it's still loaded, so we don't need to do anything. Delete |
| 418 | it from the inferior's list, and leave it on GDB's list. */ |
| 419 | if (i) |
| 420 | { |
| 421 | *i_link = i->next; |
| 422 | free_so (i); |
| 423 | gdb_link = &gdb->next; |
| 424 | gdb = *gdb_link; |
| 425 | } |
| 426 | |
| 427 | /* If it's not on the inferior's list, remove it from GDB's tables. */ |
| 428 | else |
| 429 | { |
| 430 | *gdb_link = gdb->next; |
| 431 | |
| 432 | /* Unless the user loaded it explicitly, free SO's objfile. */ |
| 433 | if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED)) |
| 434 | free_objfile (gdb->objfile); |
| 435 | |
| 436 | /* Some targets' section tables might be referring to |
| 437 | sections from so->abfd; remove them. */ |
| 438 | remove_target_sections (gdb->abfd); |
| 439 | |
| 440 | free_so (gdb); |
| 441 | gdb = *gdb_link; |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | /* Now the inferior's list contains only shared objects that don't |
| 446 | appear in GDB's list --- those that are newly loaded. Add them |
| 447 | to GDB's shared object list. */ |
| 448 | if (inferior) |
| 449 | { |
| 450 | struct so_list *i; |
| 451 | |
| 452 | /* Add the new shared objects to GDB's list. */ |
| 453 | *gdb_link = inferior; |
| 454 | |
| 455 | /* Fill in the rest of each of the `struct so_list' nodes. */ |
| 456 | for (i = inferior; i; i = i->next) |
| 457 | { |
| 458 | i->from_tty = from_tty; |
| 459 | |
| 460 | /* Fill in the rest of the `struct so_list' node. */ |
| 461 | catch_errors (solib_map_sections, i, |
| 462 | "Error while mapping shared library sections:\n", |
| 463 | RETURN_MASK_ALL); |
| 464 | } |
| 465 | |
| 466 | /* If requested, add the shared objects' sections to the the |
| 467 | TARGET's section table. */ |
| 468 | if (target) |
| 469 | { |
| 470 | int new_sections; |
| 471 | |
| 472 | /* Figure out how many sections we'll need to add in total. */ |
| 473 | new_sections = 0; |
| 474 | for (i = inferior; i; i = i->next) |
| 475 | new_sections += (i->sections_end - i->sections); |
| 476 | |
| 477 | if (new_sections > 0) |
| 478 | { |
| 479 | int space = target_resize_to_sections (target, new_sections); |
| 480 | |
| 481 | for (i = inferior; i; i = i->next) |
| 482 | { |
| 483 | int count = (i->sections_end - i->sections); |
| 484 | memcpy (target->to_sections + space, |
| 485 | i->sections, |
| 486 | count * sizeof (i->sections[0])); |
| 487 | space += count; |
| 488 | } |
| 489 | } |
| 490 | } |
| 491 | } |
| 492 | } |
| 493 | |
| 494 | |
| 495 | /* GLOBAL FUNCTION |
| 496 | |
| 497 | solib_add -- read in symbol info for newly added shared libraries |
| 498 | |
| 499 | SYNOPSIS |
| 500 | |
| 501 | void solib_add (char *pattern, int from_tty, struct target_ops *TARGET) |
| 502 | |
| 503 | DESCRIPTION |
| 504 | |
| 505 | Read in symbolic information for any shared objects whose names |
| 506 | match PATTERN. (If we've already read a shared object's symbol |
| 507 | info, leave it alone.) If PATTERN is zero, read them all. |
| 508 | |
| 509 | FROM_TTY and TARGET are as described for update_solib_list, above. */ |
| 510 | |
| 511 | void |
| 512 | solib_add (char *pattern, int from_tty, struct target_ops *target) |
| 513 | { |
| 514 | struct so_list *gdb; |
| 515 | |
| 516 | if (pattern) |
| 517 | { |
| 518 | char *re_err = re_comp (pattern); |
| 519 | |
| 520 | if (re_err) |
| 521 | error ("Invalid regexp: %s", re_err); |
| 522 | } |
| 523 | |
| 524 | update_solib_list (from_tty, target); |
| 525 | |
| 526 | /* Walk the list of currently loaded shared libraries, and read |
| 527 | symbols for any that match the pattern --- or any whose symbols |
| 528 | aren't already loaded, if no pattern was given. */ |
| 529 | { |
| 530 | int any_matches = 0; |
| 531 | int loaded_any_symbols = 0; |
| 532 | |
| 533 | for (gdb = so_list_head; gdb; gdb = gdb->next) |
| 534 | if (! pattern || re_exec (gdb->so_name)) |
| 535 | { |
| 536 | any_matches = 1; |
| 537 | |
| 538 | if (gdb->symbols_loaded) |
| 539 | { |
| 540 | if (from_tty) |
| 541 | printf_unfiltered ("Symbols already loaded for %s\n", |
| 542 | gdb->so_name); |
| 543 | } |
| 544 | else |
| 545 | { |
| 546 | if (catch_errors |
| 547 | (symbol_add_stub, gdb, |
| 548 | "Error while reading shared library symbols:\n", |
| 549 | RETURN_MASK_ALL)) |
| 550 | { |
| 551 | if (from_tty) |
| 552 | printf_unfiltered ("Loaded symbols for %s\n", |
| 553 | gdb->so_name); |
| 554 | gdb->symbols_loaded = 1; |
| 555 | loaded_any_symbols = 1; |
| 556 | } |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | if (from_tty && pattern && ! any_matches) |
| 561 | printf_unfiltered |
| 562 | ("No loaded shared libraries match the pattern `%s'.\n", pattern); |
| 563 | |
| 564 | if (loaded_any_symbols) |
| 565 | { |
| 566 | /* Getting new symbols may change our opinion about what is |
| 567 | frameless. */ |
| 568 | reinit_frame_cache (); |
| 569 | |
| 570 | TARGET_SO_SPECIAL_SYMBOL_HANDLING (); |
| 571 | } |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | |
| 576 | /* |
| 577 | |
| 578 | LOCAL FUNCTION |
| 579 | |
| 580 | info_sharedlibrary_command -- code for "info sharedlibrary" |
| 581 | |
| 582 | SYNOPSIS |
| 583 | |
| 584 | static void info_sharedlibrary_command () |
| 585 | |
| 586 | DESCRIPTION |
| 587 | |
| 588 | Walk through the shared library list and print information |
| 589 | about each attached library. |
| 590 | */ |
| 591 | |
| 592 | static void |
| 593 | info_sharedlibrary_command (char *ignore, int from_tty) |
| 594 | { |
| 595 | register struct so_list *so = NULL; /* link map state variable */ |
| 596 | int header_done = 0; |
| 597 | int addr_width; |
| 598 | char *addr_fmt; |
| 599 | int arch_size; |
| 600 | |
| 601 | if (exec_bfd == NULL) |
| 602 | { |
| 603 | printf_unfiltered ("No executable file.\n"); |
| 604 | return; |
| 605 | } |
| 606 | |
| 607 | arch_size = bfd_get_arch_size (exec_bfd); |
| 608 | /* Default to 32-bit in case of failure (non-elf). */ |
| 609 | if (arch_size == 32 || arch_size == -1) |
| 610 | { |
| 611 | addr_width = 8 + 4; |
| 612 | addr_fmt = "08l"; |
| 613 | } |
| 614 | else if (arch_size == 64) |
| 615 | { |
| 616 | addr_width = 16 + 4; |
| 617 | addr_fmt = "016l"; |
| 618 | } |
| 619 | else |
| 620 | { |
| 621 | internal_error (__FILE__, __LINE__, |
| 622 | "bfd_get_arch_size() returned unknown size %d", |
| 623 | arch_size); |
| 624 | } |
| 625 | |
| 626 | update_solib_list (from_tty, 0); |
| 627 | |
| 628 | for (so = so_list_head; so; so = so->next) |
| 629 | { |
| 630 | if (so->so_name[0]) |
| 631 | { |
| 632 | if (!header_done) |
| 633 | { |
| 634 | printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From", |
| 635 | addr_width, "To", "Syms Read", |
| 636 | "Shared Object Library"); |
| 637 | header_done++; |
| 638 | } |
| 639 | |
| 640 | printf_unfiltered ("%-*s", addr_width, |
| 641 | so->textsection != NULL |
| 642 | ? longest_local_hex_string_custom ( |
| 643 | (LONGEST) so->textsection->addr, |
| 644 | addr_fmt) |
| 645 | : ""); |
| 646 | printf_unfiltered ("%-*s", addr_width, |
| 647 | so->textsection != NULL |
| 648 | ? longest_local_hex_string_custom ( |
| 649 | (LONGEST) so->textsection->endaddr, |
| 650 | addr_fmt) |
| 651 | : ""); |
| 652 | printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No"); |
| 653 | printf_unfiltered ("%s\n", so->so_name); |
| 654 | } |
| 655 | } |
| 656 | if (so_list_head == NULL) |
| 657 | { |
| 658 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | /* |
| 663 | |
| 664 | GLOBAL FUNCTION |
| 665 | |
| 666 | solib_address -- check to see if an address is in a shared lib |
| 667 | |
| 668 | SYNOPSIS |
| 669 | |
| 670 | char * solib_address (CORE_ADDR address) |
| 671 | |
| 672 | DESCRIPTION |
| 673 | |
| 674 | Provides a hook for other gdb routines to discover whether or |
| 675 | not a particular address is within the mapped address space of |
| 676 | a shared library. |
| 677 | |
| 678 | For example, this routine is called at one point to disable |
| 679 | breakpoints which are in shared libraries that are not currently |
| 680 | mapped in. |
| 681 | */ |
| 682 | |
| 683 | char * |
| 684 | solib_address (CORE_ADDR address) |
| 685 | { |
| 686 | register struct so_list *so = 0; /* link map state variable */ |
| 687 | |
| 688 | for (so = so_list_head; so; so = so->next) |
| 689 | { |
| 690 | struct section_table *p; |
| 691 | |
| 692 | for (p = so->sections; p < so->sections_end; p++) |
| 693 | { |
| 694 | if (p->addr <= address && address < p->endaddr) |
| 695 | return (so->so_name); |
| 696 | } |
| 697 | } |
| 698 | |
| 699 | return (0); |
| 700 | } |
| 701 | |
| 702 | /* Called by free_all_symtabs */ |
| 703 | |
| 704 | void |
| 705 | clear_solib (void) |
| 706 | { |
| 707 | /* This function is expected to handle ELF shared libraries. It is |
| 708 | also used on Solaris, which can run either ELF or a.out binaries |
| 709 | (for compatibility with SunOS 4), both of which can use shared |
| 710 | libraries. So we don't know whether we have an ELF executable or |
| 711 | an a.out executable until the user chooses an executable file. |
| 712 | |
| 713 | ELF shared libraries don't get mapped into the address space |
| 714 | until after the program starts, so we'd better not try to insert |
| 715 | breakpoints in them immediately. We have to wait until the |
| 716 | dynamic linker has loaded them; we'll hit a bp_shlib_event |
| 717 | breakpoint (look for calls to create_solib_event_breakpoint) when |
| 718 | it's ready. |
| 719 | |
| 720 | SunOS shared libraries seem to be different --- they're present |
| 721 | as soon as the process begins execution, so there's no need to |
| 722 | put off inserting breakpoints. There's also nowhere to put a |
| 723 | bp_shlib_event breakpoint, so if we put it off, we'll never get |
| 724 | around to it. |
| 725 | |
| 726 | So: disable breakpoints only if we're using ELF shared libs. */ |
| 727 | if (exec_bfd != NULL |
| 728 | && bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour) |
| 729 | disable_breakpoints_in_shlibs (1); |
| 730 | |
| 731 | while (so_list_head) |
| 732 | { |
| 733 | struct so_list *so = so_list_head; |
| 734 | so_list_head = so->next; |
| 735 | free_so (so); |
| 736 | } |
| 737 | |
| 738 | TARGET_SO_CLEAR_SOLIB (); |
| 739 | } |
| 740 | |
| 741 | static void |
| 742 | do_clear_solib (PTR dummy) |
| 743 | { |
| 744 | solib_cleanup_queued = 0; |
| 745 | clear_solib (); |
| 746 | } |
| 747 | |
| 748 | /* GLOBAL FUNCTION |
| 749 | |
| 750 | solib_create_inferior_hook -- shared library startup support |
| 751 | |
| 752 | SYNOPSIS |
| 753 | |
| 754 | void solib_create_inferior_hook() |
| 755 | |
| 756 | DESCRIPTION |
| 757 | |
| 758 | When gdb starts up the inferior, it nurses it along (through the |
| 759 | shell) until it is ready to execute it's first instruction. At this |
| 760 | point, this function gets called via expansion of the macro |
| 761 | SOLIB_CREATE_INFERIOR_HOOK. */ |
| 762 | |
| 763 | void |
| 764 | solib_create_inferior_hook (void) |
| 765 | { |
| 766 | TARGET_SO_SOLIB_CREATE_INFERIOR_HOOK (); |
| 767 | } |
| 768 | |
| 769 | /* GLOBAL FUNCTION |
| 770 | |
| 771 | in_solib_dynsym_resolve_code -- check to see if an address is in |
| 772 | dynamic loader's dynamic symbol |
| 773 | resolution code |
| 774 | |
| 775 | SYNOPSIS |
| 776 | |
| 777 | int in_solib_dynsym_resolve_code (CORE_ADDR pc) |
| 778 | |
| 779 | DESCRIPTION |
| 780 | |
| 781 | Determine if PC is in the dynamic linker's symbol resolution |
| 782 | code. Return 1 if so, 0 otherwise. |
| 783 | */ |
| 784 | |
| 785 | int |
| 786 | in_solib_dynsym_resolve_code (CORE_ADDR pc) |
| 787 | { |
| 788 | return TARGET_SO_IN_DYNSYM_RESOLVE_CODE (pc); |
| 789 | } |
| 790 | |
| 791 | /* |
| 792 | |
| 793 | LOCAL FUNCTION |
| 794 | |
| 795 | sharedlibrary_command -- handle command to explicitly add library |
| 796 | |
| 797 | SYNOPSIS |
| 798 | |
| 799 | static void sharedlibrary_command (char *args, int from_tty) |
| 800 | |
| 801 | DESCRIPTION |
| 802 | |
| 803 | */ |
| 804 | |
| 805 | static void |
| 806 | sharedlibrary_command (char *args, int from_tty) |
| 807 | { |
| 808 | dont_repeat (); |
| 809 | solib_add (args, from_tty, (struct target_ops *) 0); |
| 810 | } |
| 811 | |
| 812 | /* LOCAL FUNCTION |
| 813 | |
| 814 | no_shared_libraries -- handle command to explicitly discard symbols |
| 815 | from shared libraries. |
| 816 | |
| 817 | DESCRIPTION |
| 818 | |
| 819 | Implements the command "nosharedlibrary", which discards symbols |
| 820 | that have been auto-loaded from shared libraries. Symbols from |
| 821 | shared libraries that were added by explicit request of the user |
| 822 | are not discarded. Also called from remote.c. */ |
| 823 | |
| 824 | void |
| 825 | no_shared_libraries (char *ignored, int from_tty) |
| 826 | { |
| 827 | objfile_purge_solibs (); |
| 828 | do_clear_solib (NULL); |
| 829 | } |
| 830 | |
| 831 | void |
| 832 | _initialize_solib (void) |
| 833 | { |
| 834 | struct cmd_list_element *c; |
| 835 | |
| 836 | add_com ("sharedlibrary", class_files, sharedlibrary_command, |
| 837 | "Load shared object library symbols for files matching REGEXP."); |
| 838 | add_info ("sharedlibrary", info_sharedlibrary_command, |
| 839 | "Status of loaded shared object libraries."); |
| 840 | add_com ("nosharedlibrary", class_files, no_shared_libraries, |
| 841 | "Unload all shared object library symbols."); |
| 842 | |
| 843 | add_show_from_set |
| 844 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, |
| 845 | (char *) &auto_solib_add, |
| 846 | "Set autoloading of shared library symbols.\n\ |
| 847 | If nonzero, symbols from all shared object libraries will be loaded\n\ |
| 848 | automatically when the inferior begins execution or when the dynamic linker\n\ |
| 849 | informs gdb that a new library has been loaded. Otherwise, symbols\n\ |
| 850 | must be loaded manually, using `sharedlibrary'.", |
| 851 | &setlist), |
| 852 | &showlist); |
| 853 | |
| 854 | c = add_set_cmd ("solib-absolute-prefix", class_support, var_filename, |
| 855 | (char *) &solib_absolute_prefix, |
| 856 | "Set prefix for loading absolute shared library symbol files.\n\ |
| 857 | For other (relative) files, you can add values using `set solib-search-path'.", |
| 858 | &setlist); |
| 859 | add_show_from_set (c, &showlist); |
| 860 | c->completer = filename_completer; |
| 861 | |
| 862 | c = add_set_cmd ("solib-search-path", class_support, var_string, |
| 863 | (char *) &solib_search_path, |
| 864 | "Set the search path for loading non-absolute shared library symbol files.\n\ |
| 865 | This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.", |
| 866 | &setlist); |
| 867 | add_show_from_set (c, &showlist); |
| 868 | c->completer = filename_completer; |
| 869 | } |