| 1 | /* libthread_db assisted debugging support, generic parts. |
| 2 | |
| 3 | Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | |
| 23 | #include "gdb_assert.h" |
| 24 | #include <dlfcn.h> |
| 25 | #include "gdb_proc_service.h" |
| 26 | #include "gdb_thread_db.h" |
| 27 | |
| 28 | #include "bfd.h" |
| 29 | #include "exceptions.h" |
| 30 | #include "gdbthread.h" |
| 31 | #include "inferior.h" |
| 32 | #include "symfile.h" |
| 33 | #include "objfiles.h" |
| 34 | #include "target.h" |
| 35 | #include "regcache.h" |
| 36 | #include "solib-svr4.h" |
| 37 | #include "gdbcore.h" |
| 38 | #include "observer.h" |
| 39 | #include "linux-nat.h" |
| 40 | |
| 41 | #include <signal.h> |
| 42 | |
| 43 | #ifdef HAVE_GNU_LIBC_VERSION_H |
| 44 | #include <gnu/libc-version.h> |
| 45 | #endif |
| 46 | |
| 47 | #ifndef LIBTHREAD_DB_SO |
| 48 | #define LIBTHREAD_DB_SO "libthread_db.so.1" |
| 49 | #endif |
| 50 | |
| 51 | /* GNU/Linux libthread_db support. |
| 52 | |
| 53 | libthread_db is a library, provided along with libpthread.so, which |
| 54 | exposes the internals of the thread library to a debugger. It |
| 55 | allows GDB to find existing threads, new threads as they are |
| 56 | created, thread IDs (usually, the result of pthread_self), and |
| 57 | thread-local variables. |
| 58 | |
| 59 | The libthread_db interface originates on Solaris, where it is |
| 60 | both more powerful and more complicated. This implementation |
| 61 | only works for LinuxThreads and NPTL, the two glibc threading |
| 62 | libraries. It assumes that each thread is permanently assigned |
| 63 | to a single light-weight process (LWP). |
| 64 | |
| 65 | libthread_db-specific information is stored in the "private" field |
| 66 | of struct thread_info. When the field is NULL we do not yet have |
| 67 | information about the new thread; this could be temporary (created, |
| 68 | but the thread library's data structures do not reflect it yet) |
| 69 | or permanent (created using clone instead of pthread_create). |
| 70 | |
| 71 | Process IDs managed by linux-thread-db.c match those used by |
| 72 | linux-nat.c: a common PID for all processes, an LWP ID for each |
| 73 | thread, and no TID. We save the TID in private. Keeping it out |
| 74 | of the ptid_t prevents thread IDs changing when libpthread is |
| 75 | loaded or unloaded. */ |
| 76 | |
| 77 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
| 78 | threads. */ |
| 79 | |
| 80 | /* This module's target vector. */ |
| 81 | static struct target_ops thread_db_ops; |
| 82 | |
| 83 | /* Non-zero if we're using this module's target vector. */ |
| 84 | static int using_thread_db; |
| 85 | |
| 86 | /* Non-zero if we have determined the signals used by the threads |
| 87 | library. */ |
| 88 | static int thread_signals; |
| 89 | static sigset_t thread_stop_set; |
| 90 | static sigset_t thread_print_set; |
| 91 | |
| 92 | /* Structure that identifies the child process for the |
| 93 | <proc_service.h> interface. */ |
| 94 | static struct ps_prochandle proc_handle; |
| 95 | |
| 96 | /* Connection to the libthread_db library. */ |
| 97 | static td_thragent_t *thread_agent; |
| 98 | |
| 99 | /* Pointers to the libthread_db functions. */ |
| 100 | |
| 101 | static td_err_e (*td_init_p) (void); |
| 102 | |
| 103 | static td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
| 104 | td_thragent_t **ta); |
| 105 | static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
| 106 | td_thrhandle_t *__th); |
| 107 | static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, |
| 108 | lwpid_t lwpid, td_thrhandle_t *th); |
| 109 | static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, |
| 110 | td_thr_iter_f *callback, void *cbdata_p, |
| 111 | td_thr_state_e state, int ti_pri, |
| 112 | sigset_t *ti_sigmask_p, |
| 113 | unsigned int ti_user_flags); |
| 114 | static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, |
| 115 | td_event_e event, td_notify_t *ptr); |
| 116 | static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, |
| 117 | td_thr_events_t *event); |
| 118 | static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
| 119 | td_event_msg_t *msg); |
| 120 | |
| 121 | static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); |
| 122 | static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, |
| 123 | td_thrinfo_t *infop); |
| 124 | static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, |
| 125 | int event); |
| 126 | |
| 127 | static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, |
| 128 | void *map_address, |
| 129 | size_t offset, void **address); |
| 130 | |
| 131 | /* Location of the thread creation event breakpoint. The code at this |
| 132 | location in the child process will be called by the pthread library |
| 133 | whenever a new thread is created. By setting a special breakpoint |
| 134 | at this location, GDB can detect when a new thread is created. We |
| 135 | obtain this location via the td_ta_event_addr call. */ |
| 136 | static CORE_ADDR td_create_bp_addr; |
| 137 | |
| 138 | /* Location of the thread death event breakpoint. */ |
| 139 | static CORE_ADDR td_death_bp_addr; |
| 140 | |
| 141 | /* Prototypes for local functions. */ |
| 142 | static void thread_db_find_new_threads_1 (void); |
| 143 | static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
| 144 | const td_thrinfo_t *ti_p); |
| 145 | static void detach_thread (ptid_t ptid); |
| 146 | \f |
| 147 | |
| 148 | /* Use "struct private_thread_info" to cache thread state. This is |
| 149 | a substantial optimization. */ |
| 150 | |
| 151 | struct private_thread_info |
| 152 | { |
| 153 | /* Flag set when we see a TD_DEATH event for this thread. */ |
| 154 | unsigned int dying:1; |
| 155 | |
| 156 | /* Cached thread state. */ |
| 157 | td_thrhandle_t th; |
| 158 | thread_t tid; |
| 159 | }; |
| 160 | \f |
| 161 | |
| 162 | static char * |
| 163 | thread_db_err_str (td_err_e err) |
| 164 | { |
| 165 | static char buf[64]; |
| 166 | |
| 167 | switch (err) |
| 168 | { |
| 169 | case TD_OK: |
| 170 | return "generic 'call succeeded'"; |
| 171 | case TD_ERR: |
| 172 | return "generic error"; |
| 173 | case TD_NOTHR: |
| 174 | return "no thread to satisfy query"; |
| 175 | case TD_NOSV: |
| 176 | return "no sync handle to satisfy query"; |
| 177 | case TD_NOLWP: |
| 178 | return "no LWP to satisfy query"; |
| 179 | case TD_BADPH: |
| 180 | return "invalid process handle"; |
| 181 | case TD_BADTH: |
| 182 | return "invalid thread handle"; |
| 183 | case TD_BADSH: |
| 184 | return "invalid synchronization handle"; |
| 185 | case TD_BADTA: |
| 186 | return "invalid thread agent"; |
| 187 | case TD_BADKEY: |
| 188 | return "invalid key"; |
| 189 | case TD_NOMSG: |
| 190 | return "no event message for getmsg"; |
| 191 | case TD_NOFPREGS: |
| 192 | return "FPU register set not available"; |
| 193 | case TD_NOLIBTHREAD: |
| 194 | return "application not linked with libthread"; |
| 195 | case TD_NOEVENT: |
| 196 | return "requested event is not supported"; |
| 197 | case TD_NOCAPAB: |
| 198 | return "capability not available"; |
| 199 | case TD_DBERR: |
| 200 | return "debugger service failed"; |
| 201 | case TD_NOAPLIC: |
| 202 | return "operation not applicable to"; |
| 203 | case TD_NOTSD: |
| 204 | return "no thread-specific data for this thread"; |
| 205 | case TD_MALLOC: |
| 206 | return "malloc failed"; |
| 207 | case TD_PARTIALREG: |
| 208 | return "only part of register set was written/read"; |
| 209 | case TD_NOXREGS: |
| 210 | return "X register set not available for this thread"; |
| 211 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
| 212 | case TD_NOTALLOC: |
| 213 | return "thread has not yet allocated TLS for given module"; |
| 214 | #endif |
| 215 | #ifdef THREAD_DB_HAS_TD_VERSION |
| 216 | case TD_VERSION: |
| 217 | return "versions of libpthread and libthread_db do not match"; |
| 218 | #endif |
| 219 | #ifdef THREAD_DB_HAS_TD_NOTLS |
| 220 | case TD_NOTLS: |
| 221 | return "there is no TLS segment in the given module"; |
| 222 | #endif |
| 223 | default: |
| 224 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); |
| 225 | return buf; |
| 226 | } |
| 227 | } |
| 228 | \f |
| 229 | /* Return 1 if any threads have been registered. There may be none if |
| 230 | the threading library is not fully initialized yet. */ |
| 231 | |
| 232 | static int |
| 233 | have_threads_callback (struct thread_info *thread, void *dummy) |
| 234 | { |
| 235 | return thread->private != NULL; |
| 236 | } |
| 237 | |
| 238 | static int |
| 239 | have_threads (void) |
| 240 | { |
| 241 | return iterate_over_threads (have_threads_callback, NULL) != NULL; |
| 242 | } |
| 243 | |
| 244 | /* A callback function for td_ta_thr_iter, which we use to map all |
| 245 | threads to LWPs. |
| 246 | |
| 247 | THP is a handle to the current thread; if INFOP is not NULL, the |
| 248 | struct thread_info associated with this thread is returned in |
| 249 | *INFOP. |
| 250 | |
| 251 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, |
| 252 | zero is returned to indicate success. */ |
| 253 | |
| 254 | static int |
| 255 | thread_get_info_callback (const td_thrhandle_t *thp, void *infop) |
| 256 | { |
| 257 | td_thrinfo_t ti; |
| 258 | td_err_e err; |
| 259 | struct thread_info *thread_info; |
| 260 | ptid_t thread_ptid; |
| 261 | |
| 262 | err = td_thr_get_info_p (thp, &ti); |
| 263 | if (err != TD_OK) |
| 264 | error (_("thread_get_info_callback: cannot get thread info: %s"), |
| 265 | thread_db_err_str (err)); |
| 266 | |
| 267 | /* Fill the cache. */ |
| 268 | thread_ptid = ptid_build (GET_PID (proc_handle.ptid), ti.ti_lid, 0); |
| 269 | thread_info = find_thread_pid (thread_ptid); |
| 270 | |
| 271 | /* In the case of a zombie thread, don't continue. We don't want to |
| 272 | attach to it thinking it is a new thread. */ |
| 273 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
| 274 | { |
| 275 | if (infop != NULL) |
| 276 | *(struct thread_info **) infop = thread_info; |
| 277 | return TD_THR_ZOMBIE; |
| 278 | } |
| 279 | |
| 280 | if (thread_info == NULL) |
| 281 | { |
| 282 | /* New thread. Attach to it now (why wait?). */ |
| 283 | if (!have_threads ()) |
| 284 | thread_db_find_new_threads_1 (); |
| 285 | else |
| 286 | attach_thread (thread_ptid, thp, &ti); |
| 287 | thread_info = find_thread_pid (thread_ptid); |
| 288 | gdb_assert (thread_info != NULL); |
| 289 | } |
| 290 | |
| 291 | if (infop != NULL) |
| 292 | *(struct thread_info **) infop = thread_info; |
| 293 | |
| 294 | return 0; |
| 295 | } |
| 296 | \f |
| 297 | /* Convert between user-level thread ids and LWP ids. */ |
| 298 | |
| 299 | static ptid_t |
| 300 | thread_from_lwp (ptid_t ptid) |
| 301 | { |
| 302 | td_thrhandle_t th; |
| 303 | td_err_e err; |
| 304 | struct thread_info *thread_info; |
| 305 | ptid_t thread_ptid; |
| 306 | |
| 307 | /* This ptid comes from linux-nat.c, which should always fill in the |
| 308 | LWP. */ |
| 309 | gdb_assert (GET_LWP (ptid) != 0); |
| 310 | |
| 311 | /* Access an lwp we know is stopped. */ |
| 312 | proc_handle.ptid = ptid; |
| 313 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); |
| 314 | if (err != TD_OK) |
| 315 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
| 316 | GET_LWP (ptid), thread_db_err_str (err)); |
| 317 | |
| 318 | thread_info = NULL; |
| 319 | |
| 320 | /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the |
| 321 | event thread has already died. If another gdb interface has called |
| 322 | thread_alive() previously, the thread won't be found on the thread list |
| 323 | anymore. In that case, we don't want to process this ptid anymore |
| 324 | to avoid the possibility of later treating it as a newly |
| 325 | discovered thread id that we should add to the list. Thus, |
| 326 | we return a -1 ptid which is also how the thread list marks a |
| 327 | dead thread. */ |
| 328 | if (thread_get_info_callback (&th, &thread_info) == TD_THR_ZOMBIE |
| 329 | && thread_info == NULL) |
| 330 | return pid_to_ptid (-1); |
| 331 | |
| 332 | gdb_assert (ptid_get_tid (ptid) == 0); |
| 333 | return ptid; |
| 334 | } |
| 335 | \f |
| 336 | |
| 337 | /* Attach to lwp PTID, doing whatever else is required to have this |
| 338 | LWP under the debugger's control --- e.g., enabling event |
| 339 | reporting. Returns true on success. */ |
| 340 | int |
| 341 | thread_db_attach_lwp (ptid_t ptid) |
| 342 | { |
| 343 | td_thrhandle_t th; |
| 344 | td_thrinfo_t ti; |
| 345 | td_err_e err; |
| 346 | |
| 347 | if (!using_thread_db) |
| 348 | return 0; |
| 349 | |
| 350 | /* This ptid comes from linux-nat.c, which should always fill in the |
| 351 | LWP. */ |
| 352 | gdb_assert (GET_LWP (ptid) != 0); |
| 353 | |
| 354 | /* Access an lwp we know is stopped. */ |
| 355 | proc_handle.ptid = ptid; |
| 356 | |
| 357 | /* If we have only looked at the first thread before libpthread was |
| 358 | initialized, we may not know its thread ID yet. Make sure we do |
| 359 | before we add another thread to the list. */ |
| 360 | if (!have_threads ()) |
| 361 | thread_db_find_new_threads_1 (); |
| 362 | |
| 363 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); |
| 364 | if (err != TD_OK) |
| 365 | /* Cannot find user-level thread. */ |
| 366 | return 0; |
| 367 | |
| 368 | err = td_thr_get_info_p (&th, &ti); |
| 369 | if (err != TD_OK) |
| 370 | { |
| 371 | warning (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | attach_thread (ptid, &th, &ti); |
| 376 | return 1; |
| 377 | } |
| 378 | |
| 379 | static void * |
| 380 | verbose_dlsym (void *handle, const char *name) |
| 381 | { |
| 382 | void *sym = dlsym (handle, name); |
| 383 | if (sym == NULL) |
| 384 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), name, dlerror ()); |
| 385 | return sym; |
| 386 | } |
| 387 | |
| 388 | static int |
| 389 | thread_db_load (void) |
| 390 | { |
| 391 | void *handle; |
| 392 | td_err_e err; |
| 393 | |
| 394 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); |
| 395 | if (handle == NULL) |
| 396 | { |
| 397 | fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n", |
| 398 | LIBTHREAD_DB_SO, dlerror ()); |
| 399 | fprintf_filtered (gdb_stderr, |
| 400 | "GDB will not be able to debug pthreads.\n\n"); |
| 401 | return 0; |
| 402 | } |
| 403 | |
| 404 | /* Initialize pointers to the dynamic library functions we will use. |
| 405 | Essential functions first. */ |
| 406 | |
| 407 | td_init_p = verbose_dlsym (handle, "td_init"); |
| 408 | if (td_init_p == NULL) |
| 409 | return 0; |
| 410 | |
| 411 | td_ta_new_p = verbose_dlsym (handle, "td_ta_new"); |
| 412 | if (td_ta_new_p == NULL) |
| 413 | return 0; |
| 414 | |
| 415 | td_ta_map_id2thr_p = verbose_dlsym (handle, "td_ta_map_id2thr"); |
| 416 | if (td_ta_map_id2thr_p == NULL) |
| 417 | return 0; |
| 418 | |
| 419 | td_ta_map_lwp2thr_p = verbose_dlsym (handle, "td_ta_map_lwp2thr"); |
| 420 | if (td_ta_map_lwp2thr_p == NULL) |
| 421 | return 0; |
| 422 | |
| 423 | td_ta_thr_iter_p = verbose_dlsym (handle, "td_ta_thr_iter"); |
| 424 | if (td_ta_thr_iter_p == NULL) |
| 425 | return 0; |
| 426 | |
| 427 | td_thr_validate_p = verbose_dlsym (handle, "td_thr_validate"); |
| 428 | if (td_thr_validate_p == NULL) |
| 429 | return 0; |
| 430 | |
| 431 | td_thr_get_info_p = verbose_dlsym (handle, "td_thr_get_info"); |
| 432 | if (td_thr_get_info_p == NULL) |
| 433 | return 0; |
| 434 | |
| 435 | /* Initialize the library. */ |
| 436 | err = td_init_p (); |
| 437 | if (err != TD_OK) |
| 438 | { |
| 439 | warning (_("Cannot initialize libthread_db: %s"), thread_db_err_str (err)); |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | /* These are not essential. */ |
| 444 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); |
| 445 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); |
| 446 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); |
| 447 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); |
| 448 | td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"); |
| 449 | |
| 450 | return 1; |
| 451 | } |
| 452 | |
| 453 | static td_err_e |
| 454 | enable_thread_event (td_thragent_t *thread_agent, int event, CORE_ADDR *bp) |
| 455 | { |
| 456 | td_notify_t notify; |
| 457 | td_err_e err; |
| 458 | |
| 459 | /* Access an lwp we know is stopped. */ |
| 460 | proc_handle.ptid = inferior_ptid; |
| 461 | |
| 462 | /* Get the breakpoint address for thread EVENT. */ |
| 463 | err = td_ta_event_addr_p (thread_agent, event, ¬ify); |
| 464 | if (err != TD_OK) |
| 465 | return err; |
| 466 | |
| 467 | /* Set up the breakpoint. */ |
| 468 | gdb_assert (exec_bfd); |
| 469 | (*bp) = (gdbarch_convert_from_func_ptr_addr |
| 470 | (current_gdbarch, |
| 471 | /* Do proper sign extension for the target. */ |
| 472 | (bfd_get_sign_extend_vma (exec_bfd) > 0 |
| 473 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr |
| 474 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), |
| 475 | ¤t_target)); |
| 476 | create_thread_event_breakpoint ((*bp)); |
| 477 | |
| 478 | return TD_OK; |
| 479 | } |
| 480 | |
| 481 | static void |
| 482 | enable_thread_event_reporting (void) |
| 483 | { |
| 484 | td_thr_events_t events; |
| 485 | td_notify_t notify; |
| 486 | td_err_e err; |
| 487 | #ifdef HAVE_GNU_LIBC_VERSION_H |
| 488 | const char *libc_version; |
| 489 | int libc_major, libc_minor; |
| 490 | #endif |
| 491 | |
| 492 | /* We cannot use the thread event reporting facility if these |
| 493 | functions aren't available. */ |
| 494 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL |
| 495 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) |
| 496 | return; |
| 497 | |
| 498 | /* Set the process wide mask saying which events we're interested in. */ |
| 499 | td_event_emptyset (&events); |
| 500 | td_event_addset (&events, TD_CREATE); |
| 501 | |
| 502 | #ifdef HAVE_GNU_LIBC_VERSION_H |
| 503 | /* The event reporting facility is broken for TD_DEATH events in |
| 504 | glibc 2.1.3, so don't enable it if we have glibc but a lower |
| 505 | version. */ |
| 506 | libc_version = gnu_get_libc_version (); |
| 507 | if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 |
| 508 | && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) |
| 509 | #endif |
| 510 | td_event_addset (&events, TD_DEATH); |
| 511 | |
| 512 | err = td_ta_set_event_p (thread_agent, &events); |
| 513 | if (err != TD_OK) |
| 514 | { |
| 515 | warning (_("Unable to set global thread event mask: %s"), |
| 516 | thread_db_err_str (err)); |
| 517 | return; |
| 518 | } |
| 519 | |
| 520 | /* Delete previous thread event breakpoints, if any. */ |
| 521 | remove_thread_event_breakpoints (); |
| 522 | td_create_bp_addr = 0; |
| 523 | td_death_bp_addr = 0; |
| 524 | |
| 525 | /* Set up the thread creation event. */ |
| 526 | err = enable_thread_event (thread_agent, TD_CREATE, &td_create_bp_addr); |
| 527 | if (err != TD_OK) |
| 528 | { |
| 529 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
| 530 | thread_db_err_str (err)); |
| 531 | return; |
| 532 | } |
| 533 | |
| 534 | /* Set up the thread death event. */ |
| 535 | err = enable_thread_event (thread_agent, TD_DEATH, &td_death_bp_addr); |
| 536 | if (err != TD_OK) |
| 537 | { |
| 538 | warning (_("Unable to get location for thread death breakpoint: %s"), |
| 539 | thread_db_err_str (err)); |
| 540 | return; |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | static void |
| 545 | disable_thread_event_reporting (void) |
| 546 | { |
| 547 | td_thr_events_t events; |
| 548 | |
| 549 | /* Set the process wide mask saying we aren't interested in any |
| 550 | events anymore. */ |
| 551 | td_event_emptyset (&events); |
| 552 | td_ta_set_event_p (thread_agent, &events); |
| 553 | |
| 554 | /* Delete thread event breakpoints, if any. */ |
| 555 | remove_thread_event_breakpoints (); |
| 556 | td_create_bp_addr = 0; |
| 557 | td_death_bp_addr = 0; |
| 558 | } |
| 559 | |
| 560 | static void |
| 561 | check_thread_signals (void) |
| 562 | { |
| 563 | #ifdef GET_THREAD_SIGNALS |
| 564 | if (!thread_signals) |
| 565 | { |
| 566 | sigset_t mask; |
| 567 | int i; |
| 568 | |
| 569 | GET_THREAD_SIGNALS (&mask); |
| 570 | sigemptyset (&thread_stop_set); |
| 571 | sigemptyset (&thread_print_set); |
| 572 | |
| 573 | for (i = 1; i < NSIG; i++) |
| 574 | { |
| 575 | if (sigismember (&mask, i)) |
| 576 | { |
| 577 | if (signal_stop_update (target_signal_from_host (i), 0)) |
| 578 | sigaddset (&thread_stop_set, i); |
| 579 | if (signal_print_update (target_signal_from_host (i), 0)) |
| 580 | sigaddset (&thread_print_set, i); |
| 581 | thread_signals = 1; |
| 582 | } |
| 583 | } |
| 584 | } |
| 585 | #endif |
| 586 | } |
| 587 | |
| 588 | /* Check whether thread_db is usable. This function is called when |
| 589 | an inferior is created (or otherwise acquired, e.g. attached to) |
| 590 | and when new shared libraries are loaded into a running process. */ |
| 591 | |
| 592 | void |
| 593 | check_for_thread_db (void) |
| 594 | { |
| 595 | td_err_e err; |
| 596 | static int already_loaded; |
| 597 | |
| 598 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
| 599 | if (td_ta_new_p == NULL) |
| 600 | return; |
| 601 | |
| 602 | /* First time through, report that libthread_db was successfuly |
| 603 | loaded. Can't print this in in thread_db_load as, at that stage, |
| 604 | the interpreter and it's console haven't started. */ |
| 605 | |
| 606 | if (!already_loaded) |
| 607 | { |
| 608 | Dl_info info; |
| 609 | const char *library = NULL; |
| 610 | if (dladdr ((*td_ta_new_p), &info) != 0) |
| 611 | library = info.dli_fname; |
| 612 | |
| 613 | /* Try dlinfo? */ |
| 614 | |
| 615 | if (library == NULL) |
| 616 | /* Paranoid - don't let a NULL path slip through. */ |
| 617 | library = LIBTHREAD_DB_SO; |
| 618 | |
| 619 | if (info_verbose) |
| 620 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
| 621 | library); |
| 622 | already_loaded = 1; |
| 623 | } |
| 624 | |
| 625 | if (using_thread_db) |
| 626 | /* Nothing to do. The thread library was already detected and the |
| 627 | target vector was already activated. */ |
| 628 | return; |
| 629 | |
| 630 | /* Don't attempt to use thread_db on targets which can not run |
| 631 | (executables not running yet, core files) for now. */ |
| 632 | if (!target_has_execution) |
| 633 | return; |
| 634 | |
| 635 | /* Don't attempt to use thread_db for remote targets. */ |
| 636 | if (!target_can_run (¤t_target)) |
| 637 | return; |
| 638 | |
| 639 | /* Initialize the structure that identifies the child process. */ |
| 640 | proc_handle.ptid = inferior_ptid; |
| 641 | |
| 642 | /* Now attempt to open a connection to the thread library. */ |
| 643 | err = td_ta_new_p (&proc_handle, &thread_agent); |
| 644 | switch (err) |
| 645 | { |
| 646 | case TD_NOLIBTHREAD: |
| 647 | /* No thread library was detected. */ |
| 648 | break; |
| 649 | |
| 650 | case TD_OK: |
| 651 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
| 652 | |
| 653 | /* The thread library was detected. Activate the thread_db target. */ |
| 654 | push_target (&thread_db_ops); |
| 655 | using_thread_db = 1; |
| 656 | |
| 657 | enable_thread_event_reporting (); |
| 658 | thread_db_find_new_threads_1 (); |
| 659 | break; |
| 660 | |
| 661 | default: |
| 662 | warning (_("Cannot initialize thread debugging library: %s"), |
| 663 | thread_db_err_str (err)); |
| 664 | break; |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | static void |
| 669 | thread_db_new_objfile (struct objfile *objfile) |
| 670 | { |
| 671 | if (objfile != NULL) |
| 672 | check_for_thread_db (); |
| 673 | } |
| 674 | |
| 675 | /* Attach to a new thread. This function is called when we receive a |
| 676 | TD_CREATE event or when we iterate over all threads and find one |
| 677 | that wasn't already in our list. */ |
| 678 | |
| 679 | static void |
| 680 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
| 681 | const td_thrinfo_t *ti_p) |
| 682 | { |
| 683 | struct private_thread_info *private; |
| 684 | struct thread_info *tp = NULL; |
| 685 | td_err_e err; |
| 686 | |
| 687 | /* If we're being called after a TD_CREATE event, we may already |
| 688 | know about this thread. There are two ways this can happen. We |
| 689 | may have iterated over all threads between the thread creation |
| 690 | and the TD_CREATE event, for instance when the user has issued |
| 691 | the `info threads' command before the SIGTRAP for hitting the |
| 692 | thread creation breakpoint was reported. Alternatively, the |
| 693 | thread may have exited and a new one been created with the same |
| 694 | thread ID. In the first case we don't need to do anything; in |
| 695 | the second case we should discard information about the dead |
| 696 | thread and attach to the new one. */ |
| 697 | if (in_thread_list (ptid)) |
| 698 | { |
| 699 | tp = find_thread_pid (ptid); |
| 700 | gdb_assert (tp != NULL); |
| 701 | |
| 702 | /* If tp->private is NULL, then GDB is already attached to this |
| 703 | thread, but we do not know anything about it. We can learn |
| 704 | about it here. This can only happen if we have some other |
| 705 | way besides libthread_db to notice new threads (i.e. |
| 706 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread |
| 707 | exit, so this can not be a stale thread recreated with the |
| 708 | same ID. */ |
| 709 | if (tp->private != NULL) |
| 710 | { |
| 711 | if (!tp->private->dying) |
| 712 | return; |
| 713 | |
| 714 | delete_thread (ptid); |
| 715 | tp = NULL; |
| 716 | } |
| 717 | } |
| 718 | |
| 719 | check_thread_signals (); |
| 720 | |
| 721 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
| 722 | return; /* A zombie thread -- do not attach. */ |
| 723 | |
| 724 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
| 725 | if (tp == NULL |
| 726 | && lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid))) < 0) |
| 727 | return; |
| 728 | |
| 729 | /* Construct the thread's private data. */ |
| 730 | private = xmalloc (sizeof (struct private_thread_info)); |
| 731 | memset (private, 0, sizeof (struct private_thread_info)); |
| 732 | |
| 733 | /* A thread ID of zero may mean the thread library has not initialized |
| 734 | yet. But we shouldn't even get here if that's the case. FIXME: |
| 735 | if we change GDB to always have at least one thread in the thread |
| 736 | list this will have to go somewhere else; maybe private == NULL |
| 737 | until the thread_db target claims it. */ |
| 738 | gdb_assert (ti_p->ti_tid != 0); |
| 739 | private->th = *th_p; |
| 740 | private->tid = ti_p->ti_tid; |
| 741 | |
| 742 | /* Add the thread to GDB's thread list. */ |
| 743 | if (tp == NULL) |
| 744 | tp = add_thread_with_info (ptid, private); |
| 745 | else |
| 746 | tp->private = private; |
| 747 | |
| 748 | /* Enable thread event reporting for this thread. */ |
| 749 | err = td_thr_event_enable_p (th_p, 1); |
| 750 | if (err != TD_OK) |
| 751 | error (_("Cannot enable thread event reporting for %s: %s"), |
| 752 | target_pid_to_str (ptid), thread_db_err_str (err)); |
| 753 | } |
| 754 | |
| 755 | static void |
| 756 | detach_thread (ptid_t ptid) |
| 757 | { |
| 758 | struct thread_info *thread_info; |
| 759 | |
| 760 | /* Don't delete the thread now, because it still reports as active |
| 761 | until it has executed a few instructions after the event |
| 762 | breakpoint - if we deleted it now, "info threads" would cause us |
| 763 | to re-attach to it. Just mark it as having had a TD_DEATH |
| 764 | event. This means that we won't delete it from our thread list |
| 765 | until we notice that it's dead (via prune_threads), or until |
| 766 | something re-uses its thread ID. We'll report the thread exit |
| 767 | when the underlying LWP dies. */ |
| 768 | thread_info = find_thread_pid (ptid); |
| 769 | gdb_assert (thread_info != NULL && thread_info->private != NULL); |
| 770 | thread_info->private->dying = 1; |
| 771 | } |
| 772 | |
| 773 | static void |
| 774 | thread_db_detach (struct target_ops *ops, char *args, int from_tty) |
| 775 | { |
| 776 | struct target_ops *target_beneath = find_target_beneath (ops); |
| 777 | |
| 778 | disable_thread_event_reporting (); |
| 779 | |
| 780 | /* Forget about the child's process ID. We shouldn't need it |
| 781 | anymore. */ |
| 782 | proc_handle.ptid = null_ptid; |
| 783 | |
| 784 | /* Detach thread_db target ops. */ |
| 785 | unpush_target (&thread_db_ops); |
| 786 | using_thread_db = 0; |
| 787 | |
| 788 | target_beneath->to_detach (target_beneath, args, from_tty); |
| 789 | } |
| 790 | |
| 791 | /* Check if PID is currently stopped at the location of a thread event |
| 792 | breakpoint location. If it is, read the event message and act upon |
| 793 | the event. */ |
| 794 | |
| 795 | static void |
| 796 | check_event (ptid_t ptid) |
| 797 | { |
| 798 | struct regcache *regcache = get_thread_regcache (ptid); |
| 799 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 800 | td_event_msg_t msg; |
| 801 | td_thrinfo_t ti; |
| 802 | td_err_e err; |
| 803 | CORE_ADDR stop_pc; |
| 804 | int loop = 0; |
| 805 | |
| 806 | /* Bail out early if we're not at a thread event breakpoint. */ |
| 807 | stop_pc = regcache_read_pc (regcache) |
| 808 | - gdbarch_decr_pc_after_break (gdbarch); |
| 809 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) |
| 810 | return; |
| 811 | |
| 812 | /* Access an lwp we know is stopped. */ |
| 813 | proc_handle.ptid = ptid; |
| 814 | |
| 815 | /* If we have only looked at the first thread before libpthread was |
| 816 | initialized, we may not know its thread ID yet. Make sure we do |
| 817 | before we add another thread to the list. */ |
| 818 | if (!have_threads ()) |
| 819 | thread_db_find_new_threads_1 (); |
| 820 | |
| 821 | /* If we are at a create breakpoint, we do not know what new lwp |
| 822 | was created and cannot specifically locate the event message for it. |
| 823 | We have to call td_ta_event_getmsg() to get |
| 824 | the latest message. Since we have no way of correlating whether |
| 825 | the event message we get back corresponds to our breakpoint, we must |
| 826 | loop and read all event messages, processing them appropriately. |
| 827 | This guarantees we will process the correct message before continuing |
| 828 | from the breakpoint. |
| 829 | |
| 830 | Currently, death events are not enabled. If they are enabled, |
| 831 | the death event can use the td_thr_event_getmsg() interface to |
| 832 | get the message specifically for that lwp and avoid looping |
| 833 | below. */ |
| 834 | |
| 835 | loop = 1; |
| 836 | |
| 837 | do |
| 838 | { |
| 839 | err = td_ta_event_getmsg_p (thread_agent, &msg); |
| 840 | if (err != TD_OK) |
| 841 | { |
| 842 | if (err == TD_NOMSG) |
| 843 | return; |
| 844 | |
| 845 | error (_("Cannot get thread event message: %s"), |
| 846 | thread_db_err_str (err)); |
| 847 | } |
| 848 | |
| 849 | err = td_thr_get_info_p (msg.th_p, &ti); |
| 850 | if (err != TD_OK) |
| 851 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
| 852 | |
| 853 | ptid = ptid_build (GET_PID (ptid), ti.ti_lid, 0); |
| 854 | |
| 855 | switch (msg.event) |
| 856 | { |
| 857 | case TD_CREATE: |
| 858 | /* Call attach_thread whether or not we already know about a |
| 859 | thread with this thread ID. */ |
| 860 | attach_thread (ptid, msg.th_p, &ti); |
| 861 | |
| 862 | break; |
| 863 | |
| 864 | case TD_DEATH: |
| 865 | |
| 866 | if (!in_thread_list (ptid)) |
| 867 | error (_("Spurious thread death event.")); |
| 868 | |
| 869 | detach_thread (ptid); |
| 870 | |
| 871 | break; |
| 872 | |
| 873 | default: |
| 874 | error (_("Spurious thread event.")); |
| 875 | } |
| 876 | } |
| 877 | while (loop); |
| 878 | } |
| 879 | |
| 880 | static ptid_t |
| 881 | thread_db_wait (struct target_ops *ops, |
| 882 | ptid_t ptid, struct target_waitstatus *ourstatus) |
| 883 | { |
| 884 | struct target_ops *beneath = find_target_beneath (ops); |
| 885 | |
| 886 | ptid = beneath->to_wait (beneath, ptid, ourstatus); |
| 887 | |
| 888 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
| 889 | return ptid; |
| 890 | |
| 891 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
| 892 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
| 893 | return ptid; |
| 894 | |
| 895 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
| 896 | { |
| 897 | remove_thread_event_breakpoints (); |
| 898 | unpush_target (&thread_db_ops); |
| 899 | using_thread_db = 0; |
| 900 | |
| 901 | return ptid; |
| 902 | } |
| 903 | |
| 904 | /* If we do not know about the main thread yet, this would be a good time to |
| 905 | find it. */ |
| 906 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads ()) |
| 907 | thread_db_find_new_threads_1 (); |
| 908 | |
| 909 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
| 910 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) |
| 911 | /* Check for a thread event. */ |
| 912 | check_event (ptid); |
| 913 | |
| 914 | if (have_threads ()) |
| 915 | { |
| 916 | /* Change ptids back into the higher level PID + TID format. If |
| 917 | the thread is dead and no longer on the thread list, we will |
| 918 | get back a dead ptid. This can occur if the thread death |
| 919 | event gets postponed by other simultaneous events. In such a |
| 920 | case, we want to just ignore the event and continue on. */ |
| 921 | |
| 922 | ptid = thread_from_lwp (ptid); |
| 923 | if (GET_PID (ptid) == -1) |
| 924 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| 925 | } |
| 926 | |
| 927 | return ptid; |
| 928 | } |
| 929 | |
| 930 | static void |
| 931 | thread_db_mourn_inferior (struct target_ops *ops) |
| 932 | { |
| 933 | struct target_ops *target_beneath = find_target_beneath (ops); |
| 934 | |
| 935 | /* Forget about the child's process ID. We shouldn't need it |
| 936 | anymore. */ |
| 937 | proc_handle.ptid = null_ptid; |
| 938 | |
| 939 | target_beneath->to_mourn_inferior (target_beneath); |
| 940 | |
| 941 | /* Delete the old thread event breakpoints. Do this after mourning |
| 942 | the inferior, so that we don't try to uninsert them. */ |
| 943 | remove_thread_event_breakpoints (); |
| 944 | |
| 945 | /* Detach thread_db target ops. */ |
| 946 | unpush_target (ops); |
| 947 | using_thread_db = 0; |
| 948 | } |
| 949 | |
| 950 | static int |
| 951 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) |
| 952 | { |
| 953 | td_thrinfo_t ti; |
| 954 | td_err_e err; |
| 955 | ptid_t ptid; |
| 956 | struct thread_info *tp; |
| 957 | |
| 958 | err = td_thr_get_info_p (th_p, &ti); |
| 959 | if (err != TD_OK) |
| 960 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
| 961 | thread_db_err_str (err)); |
| 962 | |
| 963 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
| 964 | return 0; /* A zombie -- ignore. */ |
| 965 | |
| 966 | ptid = ptid_build (GET_PID (proc_handle.ptid), ti.ti_lid, 0); |
| 967 | |
| 968 | if (ti.ti_tid == 0) |
| 969 | { |
| 970 | /* A thread ID of zero means that this is the main thread, but |
| 971 | glibc has not yet initialized thread-local storage and the |
| 972 | pthread library. We do not know what the thread's TID will |
| 973 | be yet. Just enable event reporting and otherwise ignore |
| 974 | it. */ |
| 975 | |
| 976 | err = td_thr_event_enable_p (th_p, 1); |
| 977 | if (err != TD_OK) |
| 978 | error (_("Cannot enable thread event reporting for %s: %s"), |
| 979 | target_pid_to_str (ptid), thread_db_err_str (err)); |
| 980 | |
| 981 | return 0; |
| 982 | } |
| 983 | |
| 984 | tp = find_thread_pid (ptid); |
| 985 | if (tp == NULL || tp->private == NULL) |
| 986 | attach_thread (ptid, th_p, &ti); |
| 987 | |
| 988 | return 0; |
| 989 | } |
| 990 | |
| 991 | /* Search for new threads, accessing memory through stopped thread |
| 992 | PTID. */ |
| 993 | |
| 994 | static void |
| 995 | thread_db_find_new_threads_1 (void) |
| 996 | { |
| 997 | td_err_e err; |
| 998 | struct lwp_info *lp; |
| 999 | ptid_t ptid; |
| 1000 | |
| 1001 | /* In linux, we can only read memory through a stopped lwp. */ |
| 1002 | ALL_LWPS (lp, ptid) |
| 1003 | if (lp->stopped) |
| 1004 | break; |
| 1005 | |
| 1006 | if (!lp) |
| 1007 | /* There is no stopped thread. Bail out. */ |
| 1008 | return; |
| 1009 | |
| 1010 | /* Access an lwp we know is stopped. */ |
| 1011 | proc_handle.ptid = ptid; |
| 1012 | /* Iterate over all user-space threads to discover new threads. */ |
| 1013 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, |
| 1014 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, |
| 1015 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); |
| 1016 | if (err != TD_OK) |
| 1017 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); |
| 1018 | } |
| 1019 | |
| 1020 | static void |
| 1021 | thread_db_find_new_threads (struct target_ops *ops) |
| 1022 | { |
| 1023 | thread_db_find_new_threads_1 (); |
| 1024 | } |
| 1025 | |
| 1026 | static char * |
| 1027 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
| 1028 | { |
| 1029 | struct thread_info *thread_info = find_thread_pid (ptid); |
| 1030 | struct target_ops *beneath; |
| 1031 | |
| 1032 | if (thread_info != NULL && thread_info->private != NULL) |
| 1033 | { |
| 1034 | static char buf[64]; |
| 1035 | thread_t tid; |
| 1036 | |
| 1037 | tid = thread_info->private->tid; |
| 1038 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
| 1039 | tid, GET_LWP (ptid)); |
| 1040 | |
| 1041 | return buf; |
| 1042 | } |
| 1043 | |
| 1044 | beneath = find_target_beneath (ops); |
| 1045 | if (beneath->to_pid_to_str (beneath, ptid)) |
| 1046 | return beneath->to_pid_to_str (beneath, ptid); |
| 1047 | |
| 1048 | return normal_pid_to_str (ptid); |
| 1049 | } |
| 1050 | |
| 1051 | /* Return a string describing the state of the thread specified by |
| 1052 | INFO. */ |
| 1053 | |
| 1054 | static char * |
| 1055 | thread_db_extra_thread_info (struct thread_info *info) |
| 1056 | { |
| 1057 | if (info->private == NULL) |
| 1058 | return NULL; |
| 1059 | |
| 1060 | if (info->private->dying) |
| 1061 | return "Exiting"; |
| 1062 | |
| 1063 | return NULL; |
| 1064 | } |
| 1065 | |
| 1066 | /* Get the address of the thread local variable in load module LM which |
| 1067 | is stored at OFFSET within the thread local storage for thread PTID. */ |
| 1068 | |
| 1069 | static CORE_ADDR |
| 1070 | thread_db_get_thread_local_address (struct target_ops *ops, |
| 1071 | ptid_t ptid, |
| 1072 | CORE_ADDR lm, |
| 1073 | CORE_ADDR offset) |
| 1074 | { |
| 1075 | struct thread_info *thread_info; |
| 1076 | struct target_ops *beneath; |
| 1077 | |
| 1078 | /* If we have not discovered any threads yet, check now. */ |
| 1079 | if (!have_threads ()) |
| 1080 | thread_db_find_new_threads_1 (); |
| 1081 | |
| 1082 | /* Find the matching thread. */ |
| 1083 | thread_info = find_thread_pid (ptid); |
| 1084 | |
| 1085 | if (thread_info != NULL && thread_info->private != NULL) |
| 1086 | { |
| 1087 | td_err_e err; |
| 1088 | void *address; |
| 1089 | |
| 1090 | /* glibc doesn't provide the needed interface. */ |
| 1091 | if (!td_thr_tls_get_addr_p) |
| 1092 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
| 1093 | _("No TLS library support")); |
| 1094 | |
| 1095 | /* Caller should have verified that lm != 0. */ |
| 1096 | gdb_assert (lm != 0); |
| 1097 | |
| 1098 | /* Finally, get the address of the variable. */ |
| 1099 | err = td_thr_tls_get_addr_p (&thread_info->private->th, |
| 1100 | (void *)(size_t) lm, |
| 1101 | offset, &address); |
| 1102 | |
| 1103 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
| 1104 | /* The memory hasn't been allocated, yet. */ |
| 1105 | if (err == TD_NOTALLOC) |
| 1106 | /* Now, if libthread_db provided the initialization image's |
| 1107 | address, we *could* try to build a non-lvalue value from |
| 1108 | the initialization image. */ |
| 1109 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
| 1110 | _("TLS not allocated yet")); |
| 1111 | #endif |
| 1112 | |
| 1113 | /* Something else went wrong. */ |
| 1114 | if (err != TD_OK) |
| 1115 | throw_error (TLS_GENERIC_ERROR, |
| 1116 | (("%s")), thread_db_err_str (err)); |
| 1117 | |
| 1118 | /* Cast assuming host == target. Joy. */ |
| 1119 | /* Do proper sign extension for the target. */ |
| 1120 | gdb_assert (exec_bfd); |
| 1121 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 |
| 1122 | ? (CORE_ADDR) (intptr_t) address |
| 1123 | : (CORE_ADDR) (uintptr_t) address); |
| 1124 | } |
| 1125 | |
| 1126 | beneath = find_target_beneath (ops); |
| 1127 | if (beneath->to_get_thread_local_address) |
| 1128 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); |
| 1129 | else |
| 1130 | throw_error (TLS_GENERIC_ERROR, |
| 1131 | _("TLS not supported on this target")); |
| 1132 | } |
| 1133 | |
| 1134 | /* Callback routine used to find a thread based on the TID part of |
| 1135 | its PTID. */ |
| 1136 | |
| 1137 | static int |
| 1138 | thread_db_find_thread_from_tid (struct thread_info *thread, void *data) |
| 1139 | { |
| 1140 | long *tid = (long *) data; |
| 1141 | |
| 1142 | if (thread->private->tid == *tid) |
| 1143 | return 1; |
| 1144 | |
| 1145 | return 0; |
| 1146 | } |
| 1147 | |
| 1148 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
| 1149 | |
| 1150 | static ptid_t |
| 1151 | thread_db_get_ada_task_ptid (long lwp, long thread) |
| 1152 | { |
| 1153 | struct thread_info *thread_info; |
| 1154 | |
| 1155 | thread_db_find_new_threads_1 (); |
| 1156 | thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread); |
| 1157 | |
| 1158 | gdb_assert (thread_info != NULL); |
| 1159 | |
| 1160 | return (thread_info->ptid); |
| 1161 | } |
| 1162 | |
| 1163 | static void |
| 1164 | init_thread_db_ops (void) |
| 1165 | { |
| 1166 | thread_db_ops.to_shortname = "multi-thread"; |
| 1167 | thread_db_ops.to_longname = "multi-threaded child process."; |
| 1168 | thread_db_ops.to_doc = "Threads and pthreads support."; |
| 1169 | thread_db_ops.to_detach = thread_db_detach; |
| 1170 | thread_db_ops.to_wait = thread_db_wait; |
| 1171 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
| 1172 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
| 1173 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; |
| 1174 | thread_db_ops.to_stratum = thread_stratum; |
| 1175 | thread_db_ops.to_has_thread_control = tc_schedlock; |
| 1176 | thread_db_ops.to_get_thread_local_address |
| 1177 | = thread_db_get_thread_local_address; |
| 1178 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
| 1179 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
| 1180 | thread_db_ops.to_magic = OPS_MAGIC; |
| 1181 | } |
| 1182 | |
| 1183 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 1184 | extern initialize_file_ftype _initialize_thread_db; |
| 1185 | |
| 1186 | void |
| 1187 | _initialize_thread_db (void) |
| 1188 | { |
| 1189 | /* Only initialize the module if we can load libthread_db. */ |
| 1190 | if (thread_db_load ()) |
| 1191 | { |
| 1192 | init_thread_db_ops (); |
| 1193 | add_target (&thread_db_ops); |
| 1194 | |
| 1195 | /* Add ourselves to objfile event chain. */ |
| 1196 | observer_attach_new_objfile (thread_db_new_objfile); |
| 1197 | } |
| 1198 | } |