| 1 | /* libthread_db assisted debugging support, generic parts. |
| 2 | |
| 3 | Copyright 1999, 2000, 2001, 2003 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | |
| 24 | #include "gdb_assert.h" |
| 25 | #include <dlfcn.h> |
| 26 | #include "gdb_proc_service.h" |
| 27 | #include "gdb_thread_db.h" |
| 28 | |
| 29 | #include "bfd.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 | |
| 38 | #ifndef LIBTHREAD_DB_SO |
| 39 | #define LIBTHREAD_DB_SO "libthread_db.so.1" |
| 40 | #endif |
| 41 | |
| 42 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
| 43 | threads. */ |
| 44 | |
| 45 | /* FIXME: There is certainly some room for improvements: |
| 46 | - Cache LWP ids. |
| 47 | - Bypass libthread_db when fetching or storing registers for |
| 48 | threads bound to a LWP. */ |
| 49 | |
| 50 | /* This module's target vector. */ |
| 51 | static struct target_ops thread_db_ops; |
| 52 | |
| 53 | /* The target vector that we call for things this module can't handle. */ |
| 54 | static struct target_ops *target_beneath; |
| 55 | |
| 56 | /* Pointer to the next function on the objfile event chain. */ |
| 57 | static void (*target_new_objfile_chain) (struct objfile *objfile); |
| 58 | |
| 59 | /* Non-zero if we're using this module's target vector. */ |
| 60 | static int using_thread_db; |
| 61 | |
| 62 | /* Non-zero if we have to keep this module's target vector active |
| 63 | across re-runs. */ |
| 64 | static int keep_thread_db; |
| 65 | |
| 66 | /* Non-zero if we have determined the signals used by the threads |
| 67 | library. */ |
| 68 | static int thread_signals; |
| 69 | static sigset_t thread_stop_set; |
| 70 | static sigset_t thread_print_set; |
| 71 | |
| 72 | /* Structure that identifies the child process for the |
| 73 | <proc_service.h> interface. */ |
| 74 | static struct ps_prochandle proc_handle; |
| 75 | |
| 76 | /* Connection to the libthread_db library. */ |
| 77 | static td_thragent_t *thread_agent; |
| 78 | |
| 79 | /* Pointers to the libthread_db functions. */ |
| 80 | |
| 81 | static td_err_e (*td_init_p) (void); |
| 82 | |
| 83 | static td_err_e (*td_ta_new_p) (struct ps_prochandle *ps, td_thragent_t **ta); |
| 84 | static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
| 85 | td_thrhandle_t *__th); |
| 86 | static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, |
| 87 | td_thrhandle_t *th); |
| 88 | static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, |
| 89 | td_thr_iter_f *callback, |
| 90 | void *cbdata_p, td_thr_state_e state, |
| 91 | int ti_pri, sigset_t *ti_sigmask_p, |
| 92 | unsigned int ti_user_flags); |
| 93 | static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, |
| 94 | td_event_e event, td_notify_t *ptr); |
| 95 | static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, |
| 96 | td_thr_events_t *event); |
| 97 | static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
| 98 | td_event_msg_t *msg); |
| 99 | |
| 100 | static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); |
| 101 | static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, |
| 102 | td_thrinfo_t *infop); |
| 103 | static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th, |
| 104 | gdb_prfpregset_t *regset); |
| 105 | static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th, |
| 106 | prgregset_t gregs); |
| 107 | static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th, |
| 108 | const gdb_prfpregset_t *fpregs); |
| 109 | static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th, |
| 110 | prgregset_t gregs); |
| 111 | static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); |
| 112 | |
| 113 | static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, |
| 114 | void *map_address, |
| 115 | size_t offset, |
| 116 | void **address); |
| 117 | |
| 118 | /* Location of the thread creation event breakpoint. The code at this |
| 119 | location in the child process will be called by the pthread library |
| 120 | whenever a new thread is created. By setting a special breakpoint |
| 121 | at this location, GDB can detect when a new thread is created. We |
| 122 | obtain this location via the td_ta_event_addr call. */ |
| 123 | static CORE_ADDR td_create_bp_addr; |
| 124 | |
| 125 | /* Location of the thread death event breakpoint. */ |
| 126 | static CORE_ADDR td_death_bp_addr; |
| 127 | |
| 128 | /* Prototypes for local functions. */ |
| 129 | static void thread_db_find_new_threads (void); |
| 130 | static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
| 131 | const td_thrinfo_t *ti_p, int verbose); |
| 132 | \f |
| 133 | |
| 134 | /* Building process ids. */ |
| 135 | |
| 136 | #define GET_PID(ptid) ptid_get_pid (ptid) |
| 137 | #define GET_LWP(ptid) ptid_get_lwp (ptid) |
| 138 | #define GET_THREAD(ptid) ptid_get_tid (ptid) |
| 139 | |
| 140 | #define is_lwp(ptid) (GET_LWP (ptid) != 0) |
| 141 | #define is_thread(ptid) (GET_THREAD (ptid) != 0) |
| 142 | |
| 143 | #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) |
| 144 | #define BUILD_THREAD(tid, pid) ptid_build (pid, 0, tid) |
| 145 | \f |
| 146 | |
| 147 | /* Use "struct private_thread_info" to cache thread state. This is |
| 148 | a substantial optimization. */ |
| 149 | |
| 150 | struct private_thread_info |
| 151 | { |
| 152 | /* Cached thread state. */ |
| 153 | unsigned int th_valid : 1; |
| 154 | unsigned int ti_valid : 1; |
| 155 | |
| 156 | td_thrhandle_t th; |
| 157 | td_thrinfo_t ti; |
| 158 | }; |
| 159 | \f |
| 160 | |
| 161 | static char * |
| 162 | thread_db_err_str (td_err_e err) |
| 163 | { |
| 164 | static char buf[64]; |
| 165 | |
| 166 | switch (err) |
| 167 | { |
| 168 | case TD_OK: |
| 169 | return "generic 'call succeeded'"; |
| 170 | case TD_ERR: |
| 171 | return "generic error"; |
| 172 | case TD_NOTHR: |
| 173 | return "no thread to satisfy query"; |
| 174 | case TD_NOSV: |
| 175 | return "no sync handle to satisfy query"; |
| 176 | case TD_NOLWP: |
| 177 | return "no LWP to satisfy query"; |
| 178 | case TD_BADPH: |
| 179 | return "invalid process handle"; |
| 180 | case TD_BADTH: |
| 181 | return "invalid thread handle"; |
| 182 | case TD_BADSH: |
| 183 | return "invalid synchronization handle"; |
| 184 | case TD_BADTA: |
| 185 | return "invalid thread agent"; |
| 186 | case TD_BADKEY: |
| 187 | return "invalid key"; |
| 188 | case TD_NOMSG: |
| 189 | return "no event message for getmsg"; |
| 190 | case TD_NOFPREGS: |
| 191 | return "FPU register set not available"; |
| 192 | case TD_NOLIBTHREAD: |
| 193 | return "application not linked with libthread"; |
| 194 | case TD_NOEVENT: |
| 195 | return "requested event is not supported"; |
| 196 | case TD_NOCAPAB: |
| 197 | return "capability not available"; |
| 198 | case TD_DBERR: |
| 199 | return "debugger service failed"; |
| 200 | case TD_NOAPLIC: |
| 201 | return "operation not applicable to"; |
| 202 | case TD_NOTSD: |
| 203 | return "no thread-specific data for this thread"; |
| 204 | case TD_MALLOC: |
| 205 | return "malloc failed"; |
| 206 | case TD_PARTIALREG: |
| 207 | return "only part of register set was written/read"; |
| 208 | case TD_NOXREGS: |
| 209 | return "X register set not available for this thread"; |
| 210 | default: |
| 211 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); |
| 212 | return buf; |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | static char * |
| 217 | thread_db_state_str (td_thr_state_e state) |
| 218 | { |
| 219 | static char buf[64]; |
| 220 | |
| 221 | switch (state) |
| 222 | { |
| 223 | case TD_THR_STOPPED: |
| 224 | return "stopped by debugger"; |
| 225 | case TD_THR_RUN: |
| 226 | return "runnable"; |
| 227 | case TD_THR_ACTIVE: |
| 228 | return "active"; |
| 229 | case TD_THR_ZOMBIE: |
| 230 | return "zombie"; |
| 231 | case TD_THR_SLEEP: |
| 232 | return "sleeping"; |
| 233 | case TD_THR_STOPPED_ASLEEP: |
| 234 | return "stopped by debugger AND blocked"; |
| 235 | default: |
| 236 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); |
| 237 | return buf; |
| 238 | } |
| 239 | } |
| 240 | \f |
| 241 | /* A callback function for td_ta_thr_iter, which we use to map all |
| 242 | threads to LWPs. |
| 243 | |
| 244 | THP is a handle to the current thread; if INFOP is not NULL, the |
| 245 | struct thread_info associated with this thread is returned in |
| 246 | *INFOP. */ |
| 247 | |
| 248 | static int |
| 249 | thread_get_info_callback (const td_thrhandle_t *thp, void *infop) |
| 250 | { |
| 251 | td_thrinfo_t ti; |
| 252 | td_err_e err; |
| 253 | struct thread_info *thread_info; |
| 254 | ptid_t thread_ptid; |
| 255 | |
| 256 | err = td_thr_get_info_p (thp, &ti); |
| 257 | if (err != TD_OK) |
| 258 | error ("thread_get_info_callback: cannot get thread info: %s", |
| 259 | thread_db_err_str (err)); |
| 260 | |
| 261 | /* Fill the cache. */ |
| 262 | thread_ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid)); |
| 263 | thread_info = find_thread_pid (thread_ptid); |
| 264 | |
| 265 | if (thread_info == NULL) |
| 266 | { |
| 267 | /* New thread. Attach to it now (why wait?). */ |
| 268 | attach_thread (thread_ptid, thp, &ti, 1); |
| 269 | thread_info = find_thread_pid (thread_ptid); |
| 270 | gdb_assert (thread_info != NULL); |
| 271 | } |
| 272 | |
| 273 | memcpy (&thread_info->private->th, thp, sizeof (*thp)); |
| 274 | thread_info->private->th_valid = 1; |
| 275 | memcpy (&thread_info->private->ti, &ti, sizeof (ti)); |
| 276 | thread_info->private->ti_valid = 1; |
| 277 | |
| 278 | if (infop != NULL) |
| 279 | *(struct thread_info **) infop = thread_info; |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | /* Accessor functions for the thread_db information, with caching. */ |
| 285 | |
| 286 | static void |
| 287 | thread_db_map_id2thr (struct thread_info *thread_info, int fatal) |
| 288 | { |
| 289 | td_err_e err; |
| 290 | |
| 291 | if (thread_info->private->th_valid) |
| 292 | return; |
| 293 | |
| 294 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (thread_info->ptid), |
| 295 | &thread_info->private->th); |
| 296 | if (err != TD_OK) |
| 297 | { |
| 298 | if (fatal) |
| 299 | error ("Cannot find thread %ld: %s", |
| 300 | (long) GET_THREAD (thread_info->ptid), thread_db_err_str (err)); |
| 301 | } |
| 302 | else |
| 303 | thread_info->private->th_valid = 1; |
| 304 | } |
| 305 | |
| 306 | static td_thrinfo_t * |
| 307 | thread_db_get_info (struct thread_info *thread_info) |
| 308 | { |
| 309 | td_err_e err; |
| 310 | |
| 311 | if (thread_info->private->ti_valid) |
| 312 | return &thread_info->private->ti; |
| 313 | |
| 314 | if (! thread_info->private->th_valid) |
| 315 | thread_db_map_id2thr (thread_info, 1); |
| 316 | |
| 317 | err = td_thr_get_info_p (&thread_info->private->th, &thread_info->private->ti); |
| 318 | if (err != TD_OK) |
| 319 | error ("thread_db_get_info: cannot get thread info: %s", |
| 320 | thread_db_err_str (err)); |
| 321 | |
| 322 | thread_info->private->ti_valid = 1; |
| 323 | return &thread_info->private->ti; |
| 324 | } |
| 325 | \f |
| 326 | /* Convert between user-level thread ids and LWP ids. */ |
| 327 | |
| 328 | static ptid_t |
| 329 | thread_from_lwp (ptid_t ptid) |
| 330 | { |
| 331 | td_thrhandle_t th; |
| 332 | td_err_e err; |
| 333 | struct thread_info *thread_info; |
| 334 | ptid_t thread_ptid; |
| 335 | |
| 336 | if (GET_LWP (ptid) == 0) |
| 337 | ptid = BUILD_LWP (GET_PID (ptid), GET_PID (ptid)); |
| 338 | |
| 339 | gdb_assert (is_lwp (ptid)); |
| 340 | |
| 341 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); |
| 342 | if (err != TD_OK) |
| 343 | error ("Cannot find user-level thread for LWP %ld: %s", |
| 344 | GET_LWP (ptid), thread_db_err_str (err)); |
| 345 | |
| 346 | thread_info = NULL; |
| 347 | thread_get_info_callback (&th, &thread_info); |
| 348 | gdb_assert (thread_info && thread_info->private->ti_valid); |
| 349 | |
| 350 | return BUILD_THREAD (thread_info->private->ti.ti_tid, GET_PID (ptid)); |
| 351 | } |
| 352 | |
| 353 | static ptid_t |
| 354 | lwp_from_thread (ptid_t ptid) |
| 355 | { |
| 356 | struct thread_info *thread_info; |
| 357 | ptid_t thread_ptid; |
| 358 | |
| 359 | if (!is_thread (ptid)) |
| 360 | return ptid; |
| 361 | |
| 362 | thread_info = find_thread_pid (ptid); |
| 363 | thread_db_get_info (thread_info); |
| 364 | |
| 365 | return BUILD_LWP (thread_info->private->ti.ti_lid, GET_PID (ptid)); |
| 366 | } |
| 367 | \f |
| 368 | |
| 369 | void |
| 370 | thread_db_init (struct target_ops *target) |
| 371 | { |
| 372 | target_beneath = target; |
| 373 | } |
| 374 | |
| 375 | static int |
| 376 | thread_db_load (void) |
| 377 | { |
| 378 | void *handle; |
| 379 | td_err_e err; |
| 380 | |
| 381 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); |
| 382 | if (handle == NULL) |
| 383 | { |
| 384 | fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n", |
| 385 | LIBTHREAD_DB_SO, dlerror ()); |
| 386 | fprintf_filtered (gdb_stderr, |
| 387 | "GDB will not be able to debug pthreads.\n\n"); |
| 388 | return 0; |
| 389 | } |
| 390 | |
| 391 | /* Initialize pointers to the dynamic library functions we will use. |
| 392 | Essential functions first. */ |
| 393 | |
| 394 | td_init_p = dlsym (handle, "td_init"); |
| 395 | if (td_init_p == NULL) |
| 396 | return 0; |
| 397 | |
| 398 | td_ta_new_p = dlsym (handle, "td_ta_new"); |
| 399 | if (td_ta_new_p == NULL) |
| 400 | return 0; |
| 401 | |
| 402 | td_ta_map_id2thr_p = dlsym (handle, "td_ta_map_id2thr"); |
| 403 | if (td_ta_map_id2thr_p == NULL) |
| 404 | return 0; |
| 405 | |
| 406 | td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr"); |
| 407 | if (td_ta_map_lwp2thr_p == NULL) |
| 408 | return 0; |
| 409 | |
| 410 | td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter"); |
| 411 | if (td_ta_thr_iter_p == NULL) |
| 412 | return 0; |
| 413 | |
| 414 | td_thr_validate_p = dlsym (handle, "td_thr_validate"); |
| 415 | if (td_thr_validate_p == NULL) |
| 416 | return 0; |
| 417 | |
| 418 | td_thr_get_info_p = dlsym (handle, "td_thr_get_info"); |
| 419 | if (td_thr_get_info_p == NULL) |
| 420 | return 0; |
| 421 | |
| 422 | td_thr_getfpregs_p = dlsym (handle, "td_thr_getfpregs"); |
| 423 | if (td_thr_getfpregs_p == NULL) |
| 424 | return 0; |
| 425 | |
| 426 | td_thr_getgregs_p = dlsym (handle, "td_thr_getgregs"); |
| 427 | if (td_thr_getgregs_p == NULL) |
| 428 | return 0; |
| 429 | |
| 430 | td_thr_setfpregs_p = dlsym (handle, "td_thr_setfpregs"); |
| 431 | if (td_thr_setfpregs_p == NULL) |
| 432 | return 0; |
| 433 | |
| 434 | td_thr_setgregs_p = dlsym (handle, "td_thr_setgregs"); |
| 435 | if (td_thr_setgregs_p == NULL) |
| 436 | return 0; |
| 437 | |
| 438 | /* Initialize the library. */ |
| 439 | err = td_init_p (); |
| 440 | if (err != TD_OK) |
| 441 | { |
| 442 | warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err)); |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | /* These are not essential. */ |
| 447 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); |
| 448 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); |
| 449 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); |
| 450 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); |
| 451 | td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"); |
| 452 | |
| 453 | return 1; |
| 454 | } |
| 455 | |
| 456 | static void |
| 457 | enable_thread_event_reporting (void) |
| 458 | { |
| 459 | td_thr_events_t events; |
| 460 | td_notify_t notify; |
| 461 | td_err_e err; |
| 462 | |
| 463 | /* We cannot use the thread event reporting facility if these |
| 464 | functions aren't available. */ |
| 465 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL |
| 466 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) |
| 467 | return; |
| 468 | |
| 469 | /* Set the process wide mask saying which events we're interested in. */ |
| 470 | td_event_emptyset (&events); |
| 471 | td_event_addset (&events, TD_CREATE); |
| 472 | #if 0 |
| 473 | /* FIXME: kettenis/2000-04-23: The event reporting facility is |
| 474 | broken for TD_DEATH events in glibc 2.1.3, so don't enable it for |
| 475 | now. */ |
| 476 | td_event_addset (&events, TD_DEATH); |
| 477 | #endif |
| 478 | |
| 479 | err = td_ta_set_event_p (thread_agent, &events); |
| 480 | if (err != TD_OK) |
| 481 | { |
| 482 | warning ("Unable to set global thread event mask: %s", |
| 483 | thread_db_err_str (err)); |
| 484 | return; |
| 485 | } |
| 486 | |
| 487 | /* Delete previous thread event breakpoints, if any. */ |
| 488 | remove_thread_event_breakpoints (); |
| 489 | |
| 490 | /* Get address for thread creation breakpoint. */ |
| 491 | err = td_ta_event_addr_p (thread_agent, TD_CREATE, ¬ify); |
| 492 | if (err != TD_OK) |
| 493 | { |
| 494 | warning ("Unable to get location for thread creation breakpoint: %s", |
| 495 | thread_db_err_str (err)); |
| 496 | return; |
| 497 | } |
| 498 | |
| 499 | /* Set up the breakpoint. */ |
| 500 | td_create_bp_addr = (CORE_ADDR) notify.u.bptaddr; |
| 501 | create_thread_event_breakpoint (td_create_bp_addr); |
| 502 | |
| 503 | /* Get address for thread death breakpoint. */ |
| 504 | err = td_ta_event_addr_p (thread_agent, TD_DEATH, ¬ify); |
| 505 | if (err != TD_OK) |
| 506 | { |
| 507 | warning ("Unable to get location for thread death breakpoint: %s", |
| 508 | thread_db_err_str (err)); |
| 509 | return; |
| 510 | } |
| 511 | |
| 512 | /* Set up the breakpoint. */ |
| 513 | td_death_bp_addr = (CORE_ADDR) notify.u.bptaddr; |
| 514 | create_thread_event_breakpoint (td_death_bp_addr); |
| 515 | } |
| 516 | |
| 517 | static void |
| 518 | disable_thread_event_reporting (void) |
| 519 | { |
| 520 | td_thr_events_t events; |
| 521 | |
| 522 | /* Set the process wide mask saying we aren't interested in any |
| 523 | events anymore. */ |
| 524 | td_event_emptyset (&events); |
| 525 | td_ta_set_event_p (thread_agent, &events); |
| 526 | |
| 527 | /* Delete thread event breakpoints, if any. */ |
| 528 | remove_thread_event_breakpoints (); |
| 529 | td_create_bp_addr = 0; |
| 530 | td_death_bp_addr = 0; |
| 531 | } |
| 532 | |
| 533 | static void |
| 534 | check_thread_signals (void) |
| 535 | { |
| 536 | #ifdef GET_THREAD_SIGNALS |
| 537 | if (!thread_signals) |
| 538 | { |
| 539 | sigset_t mask; |
| 540 | int i; |
| 541 | |
| 542 | GET_THREAD_SIGNALS (&mask); |
| 543 | sigemptyset (&thread_stop_set); |
| 544 | sigemptyset (&thread_print_set); |
| 545 | |
| 546 | for (i = 1; i < NSIG; i++) |
| 547 | { |
| 548 | if (sigismember (&mask, i)) |
| 549 | { |
| 550 | if (signal_stop_update (target_signal_from_host (i), 0)) |
| 551 | sigaddset (&thread_stop_set, i); |
| 552 | if (signal_print_update (target_signal_from_host (i), 0)) |
| 553 | sigaddset (&thread_print_set, i); |
| 554 | thread_signals = 1; |
| 555 | } |
| 556 | } |
| 557 | } |
| 558 | #endif |
| 559 | } |
| 560 | |
| 561 | static void |
| 562 | disable_thread_signals (void) |
| 563 | { |
| 564 | #ifdef GET_THREAD_SIGNALS |
| 565 | if (thread_signals) |
| 566 | { |
| 567 | int i; |
| 568 | |
| 569 | for (i = 1; i < NSIG; i++) |
| 570 | { |
| 571 | if (sigismember (&thread_stop_set, i)) |
| 572 | signal_stop_update (target_signal_from_host (i), 1); |
| 573 | if (sigismember (&thread_print_set, i)) |
| 574 | signal_print_update (target_signal_from_host (i), 1); |
| 575 | } |
| 576 | |
| 577 | thread_signals = 0; |
| 578 | } |
| 579 | #endif |
| 580 | } |
| 581 | |
| 582 | static void |
| 583 | thread_db_new_objfile (struct objfile *objfile) |
| 584 | { |
| 585 | td_err_e err; |
| 586 | |
| 587 | /* Don't attempt to use thread_db on targets which can not run |
| 588 | (core files). */ |
| 589 | if (objfile == NULL || !target_has_execution) |
| 590 | { |
| 591 | /* All symbols have been discarded. If the thread_db target is |
| 592 | active, deactivate it now. */ |
| 593 | if (using_thread_db) |
| 594 | { |
| 595 | gdb_assert (proc_handle.pid == 0); |
| 596 | unpush_target (&thread_db_ops); |
| 597 | using_thread_db = 0; |
| 598 | } |
| 599 | |
| 600 | keep_thread_db = 0; |
| 601 | |
| 602 | goto quit; |
| 603 | } |
| 604 | |
| 605 | if (using_thread_db) |
| 606 | /* Nothing to do. The thread library was already detected and the |
| 607 | target vector was already activated. */ |
| 608 | goto quit; |
| 609 | |
| 610 | /* Initialize the structure that identifies the child process. Note |
| 611 | that at this point there is no guarantee that we actually have a |
| 612 | child process. */ |
| 613 | proc_handle.pid = GET_PID (inferior_ptid); |
| 614 | |
| 615 | /* Now attempt to open a connection to the thread library. */ |
| 616 | err = td_ta_new_p (&proc_handle, &thread_agent); |
| 617 | switch (err) |
| 618 | { |
| 619 | case TD_NOLIBTHREAD: |
| 620 | /* No thread library was detected. */ |
| 621 | break; |
| 622 | |
| 623 | case TD_OK: |
| 624 | /* The thread library was detected. Activate the thread_db target. */ |
| 625 | push_target (&thread_db_ops); |
| 626 | using_thread_db = 1; |
| 627 | |
| 628 | /* If the thread library was detected in the main symbol file |
| 629 | itself, we assume that the program was statically linked |
| 630 | against the thread library and well have to keep this |
| 631 | module's target vector activated until forever... Well, at |
| 632 | least until all symbols have been discarded anyway (see |
| 633 | above). */ |
| 634 | if (objfile == symfile_objfile) |
| 635 | { |
| 636 | gdb_assert (proc_handle.pid == 0); |
| 637 | keep_thread_db = 1; |
| 638 | } |
| 639 | |
| 640 | /* We can only poke around if there actually is a child process. |
| 641 | If there is no child process alive, postpone the steps below |
| 642 | until one has been created. */ |
| 643 | if (proc_handle.pid != 0) |
| 644 | { |
| 645 | enable_thread_event_reporting (); |
| 646 | thread_db_find_new_threads (); |
| 647 | } |
| 648 | break; |
| 649 | |
| 650 | default: |
| 651 | warning ("Cannot initialize thread debugging library: %s", |
| 652 | thread_db_err_str (err)); |
| 653 | break; |
| 654 | } |
| 655 | |
| 656 | quit: |
| 657 | if (target_new_objfile_chain) |
| 658 | target_new_objfile_chain (objfile); |
| 659 | } |
| 660 | |
| 661 | static void |
| 662 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
| 663 | const td_thrinfo_t *ti_p, int verbose) |
| 664 | { |
| 665 | struct thread_info *tp; |
| 666 | td_err_e err; |
| 667 | |
| 668 | check_thread_signals (); |
| 669 | |
| 670 | /* Add the thread to GDB's thread list. */ |
| 671 | tp = add_thread (ptid); |
| 672 | tp->private = xmalloc (sizeof (struct private_thread_info)); |
| 673 | memset (tp->private, 0, sizeof (struct private_thread_info)); |
| 674 | |
| 675 | if (verbose) |
| 676 | printf_unfiltered ("[New %s]\n", target_pid_to_str (ptid)); |
| 677 | |
| 678 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
| 679 | return; /* A zombie thread -- do not attach. */ |
| 680 | |
| 681 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
| 682 | #ifdef ATTACH_LWP |
| 683 | ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0); |
| 684 | #endif |
| 685 | |
| 686 | /* Enable thread event reporting for this thread. */ |
| 687 | err = td_thr_event_enable_p (th_p, 1); |
| 688 | if (err != TD_OK) |
| 689 | error ("Cannot enable thread event reporting for %s: %s", |
| 690 | target_pid_to_str (ptid), thread_db_err_str (err)); |
| 691 | } |
| 692 | |
| 693 | static void |
| 694 | thread_db_attach (char *args, int from_tty) |
| 695 | { |
| 696 | target_beneath->to_attach (args, from_tty); |
| 697 | |
| 698 | /* Destroy thread info; it's no longer valid. */ |
| 699 | init_thread_list (); |
| 700 | |
| 701 | /* The child process is now the actual multi-threaded |
| 702 | program. Snatch its process ID... */ |
| 703 | proc_handle.pid = GET_PID (inferior_ptid); |
| 704 | |
| 705 | /* ...and perform the remaining initialization steps. */ |
| 706 | enable_thread_event_reporting (); |
| 707 | thread_db_find_new_threads(); |
| 708 | } |
| 709 | |
| 710 | static void |
| 711 | detach_thread (ptid_t ptid, int verbose) |
| 712 | { |
| 713 | if (verbose) |
| 714 | printf_unfiltered ("[%s exited]\n", target_pid_to_str (ptid)); |
| 715 | } |
| 716 | |
| 717 | static void |
| 718 | thread_db_detach (char *args, int from_tty) |
| 719 | { |
| 720 | disable_thread_event_reporting (); |
| 721 | |
| 722 | /* There's no need to save & restore inferior_ptid here, since the |
| 723 | inferior is supposed to be survive this function call. */ |
| 724 | inferior_ptid = lwp_from_thread (inferior_ptid); |
| 725 | |
| 726 | /* Forget about the child's process ID. We shouldn't need it |
| 727 | anymore. */ |
| 728 | proc_handle.pid = 0; |
| 729 | |
| 730 | target_beneath->to_detach (args, from_tty); |
| 731 | } |
| 732 | |
| 733 | static int |
| 734 | clear_lwpid_callback (struct thread_info *thread, void *dummy) |
| 735 | { |
| 736 | /* If we know that our thread implementation is 1-to-1, we could save |
| 737 | a certain amount of information; it's not clear how much, so we |
| 738 | are always conservative. */ |
| 739 | |
| 740 | thread->private->th_valid = 0; |
| 741 | thread->private->ti_valid = 0; |
| 742 | |
| 743 | return 0; |
| 744 | } |
| 745 | |
| 746 | static void |
| 747 | thread_db_resume (ptid_t ptid, int step, enum target_signal signo) |
| 748 | { |
| 749 | struct cleanup *old_chain = save_inferior_ptid (); |
| 750 | |
| 751 | if (GET_PID (ptid) == -1) |
| 752 | inferior_ptid = lwp_from_thread (inferior_ptid); |
| 753 | else if (is_thread (ptid)) |
| 754 | ptid = lwp_from_thread (ptid); |
| 755 | |
| 756 | /* Clear cached data which may not be valid after the resume. */ |
| 757 | iterate_over_threads (clear_lwpid_callback, NULL); |
| 758 | |
| 759 | target_beneath->to_resume (ptid, step, signo); |
| 760 | |
| 761 | do_cleanups (old_chain); |
| 762 | } |
| 763 | |
| 764 | /* Check if PID is currently stopped at the location of a thread event |
| 765 | breakpoint location. If it is, read the event message and act upon |
| 766 | the event. */ |
| 767 | |
| 768 | static void |
| 769 | check_event (ptid_t ptid) |
| 770 | { |
| 771 | td_event_msg_t msg; |
| 772 | td_thrinfo_t ti; |
| 773 | td_err_e err; |
| 774 | CORE_ADDR stop_pc; |
| 775 | |
| 776 | /* Bail out early if we're not at a thread event breakpoint. */ |
| 777 | stop_pc = read_pc_pid (ptid) - DECR_PC_AFTER_BREAK; |
| 778 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) |
| 779 | return; |
| 780 | |
| 781 | err = td_ta_event_getmsg_p (thread_agent, &msg); |
| 782 | if (err != TD_OK) |
| 783 | { |
| 784 | if (err == TD_NOMSG) |
| 785 | return; |
| 786 | |
| 787 | error ("Cannot get thread event message: %s", thread_db_err_str (err)); |
| 788 | } |
| 789 | |
| 790 | err = td_thr_get_info_p (msg.th_p, &ti); |
| 791 | if (err != TD_OK) |
| 792 | error ("check_event: cannot get thread info: %s", |
| 793 | thread_db_err_str (err)); |
| 794 | |
| 795 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (ptid)); |
| 796 | |
| 797 | switch (msg.event) |
| 798 | { |
| 799 | case TD_CREATE: |
| 800 | #if 0 |
| 801 | /* FIXME: kettenis/2000-08-26: Since we use td_ta_event_getmsg, |
| 802 | there is no guarantee that the breakpoint will match the |
| 803 | event. Should we use td_thr_event_getmsg instead? */ |
| 804 | |
| 805 | if (stop_pc != td_create_bp_addr) |
| 806 | error ("Thread creation event doesn't match breakpoint."); |
| 807 | #endif |
| 808 | |
| 809 | /* We may already know about this thread, for instance when the |
| 810 | user has issued the `info threads' command before the SIGTRAP |
| 811 | for hitting the thread creation breakpoint was reported. */ |
| 812 | if (!in_thread_list (ptid)) |
| 813 | attach_thread (ptid, msg.th_p, &ti, 1); |
| 814 | return; |
| 815 | |
| 816 | case TD_DEATH: |
| 817 | #if 0 |
| 818 | /* FIXME: See TD_CREATE. */ |
| 819 | |
| 820 | if (stop_pc != td_death_bp_addr) |
| 821 | error ("Thread death event doesn't match breakpoint."); |
| 822 | #endif |
| 823 | |
| 824 | if (!in_thread_list (ptid)) |
| 825 | error ("Spurious thread death event."); |
| 826 | |
| 827 | detach_thread (ptid, 1); |
| 828 | return; |
| 829 | |
| 830 | default: |
| 831 | error ("Spurious thread event."); |
| 832 | } |
| 833 | } |
| 834 | |
| 835 | static ptid_t |
| 836 | thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus) |
| 837 | { |
| 838 | extern ptid_t trap_ptid; |
| 839 | |
| 840 | if (GET_PID (ptid) != -1 && is_thread (ptid)) |
| 841 | ptid = lwp_from_thread (ptid); |
| 842 | |
| 843 | ptid = target_beneath->to_wait (ptid, ourstatus); |
| 844 | |
| 845 | if (proc_handle.pid == 0) |
| 846 | /* The current child process isn't the actual multi-threaded |
| 847 | program yet, so don't try to do any special thread-specific |
| 848 | post-processing and bail out early. */ |
| 849 | return ptid; |
| 850 | |
| 851 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
| 852 | return pid_to_ptid (-1); |
| 853 | |
| 854 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
| 855 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) |
| 856 | /* Check for a thread event. */ |
| 857 | check_event (ptid); |
| 858 | |
| 859 | if (!ptid_equal (trap_ptid, null_ptid)) |
| 860 | trap_ptid = thread_from_lwp (trap_ptid); |
| 861 | |
| 862 | return thread_from_lwp (ptid); |
| 863 | } |
| 864 | |
| 865 | static int |
| 866 | thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
| 867 | struct mem_attrib *attrib, |
| 868 | struct target_ops *target) |
| 869 | { |
| 870 | struct cleanup *old_chain = save_inferior_ptid (); |
| 871 | int xfer; |
| 872 | |
| 873 | if (is_thread (inferior_ptid)) |
| 874 | { |
| 875 | /* FIXME: This seems to be necessary to make sure breakpoints |
| 876 | are removed. */ |
| 877 | if (!target_thread_alive (inferior_ptid)) |
| 878 | inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); |
| 879 | else |
| 880 | inferior_ptid = lwp_from_thread (inferior_ptid); |
| 881 | } |
| 882 | |
| 883 | xfer = target_beneath->to_xfer_memory (memaddr, myaddr, len, write, attrib, target); |
| 884 | |
| 885 | do_cleanups (old_chain); |
| 886 | return xfer; |
| 887 | } |
| 888 | |
| 889 | static void |
| 890 | thread_db_fetch_registers (int regno) |
| 891 | { |
| 892 | struct thread_info *thread_info; |
| 893 | prgregset_t gregset; |
| 894 | gdb_prfpregset_t fpregset; |
| 895 | td_err_e err; |
| 896 | |
| 897 | if (!is_thread (inferior_ptid)) |
| 898 | { |
| 899 | /* Pass the request to the target beneath us. */ |
| 900 | target_beneath->to_fetch_registers (regno); |
| 901 | return; |
| 902 | } |
| 903 | |
| 904 | thread_info = find_thread_pid (inferior_ptid); |
| 905 | thread_db_map_id2thr (thread_info, 1); |
| 906 | |
| 907 | err = td_thr_getgregs_p (&thread_info->private->th, gregset); |
| 908 | if (err != TD_OK) |
| 909 | error ("Cannot fetch general-purpose registers for thread %ld: %s", |
| 910 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
| 911 | |
| 912 | err = td_thr_getfpregs_p (&thread_info->private->th, &fpregset); |
| 913 | if (err != TD_OK) |
| 914 | error ("Cannot get floating-point registers for thread %ld: %s", |
| 915 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
| 916 | |
| 917 | /* Note that we must call supply_gregset after calling the thread_db |
| 918 | routines because the thread_db routines call ps_lgetgregs and |
| 919 | friends which clobber GDB's register cache. */ |
| 920 | supply_gregset ((gdb_gregset_t *) gregset); |
| 921 | supply_fpregset (&fpregset); |
| 922 | } |
| 923 | |
| 924 | static void |
| 925 | thread_db_store_registers (int regno) |
| 926 | { |
| 927 | prgregset_t gregset; |
| 928 | gdb_prfpregset_t fpregset; |
| 929 | td_err_e err; |
| 930 | struct thread_info *thread_info; |
| 931 | |
| 932 | if (!is_thread (inferior_ptid)) |
| 933 | { |
| 934 | /* Pass the request to the target beneath us. */ |
| 935 | target_beneath->to_store_registers (regno); |
| 936 | return; |
| 937 | } |
| 938 | |
| 939 | thread_info = find_thread_pid (inferior_ptid); |
| 940 | thread_db_map_id2thr (thread_info, 1); |
| 941 | |
| 942 | if (regno != -1) |
| 943 | { |
| 944 | char *raw = alloca (max_register_size (current_gdbarch)); |
| 945 | |
| 946 | deprecated_read_register_gen (regno, raw); |
| 947 | thread_db_fetch_registers (-1); |
| 948 | supply_register (regno, raw); |
| 949 | } |
| 950 | |
| 951 | fill_gregset ((gdb_gregset_t *) gregset, -1); |
| 952 | fill_fpregset (&fpregset, -1); |
| 953 | |
| 954 | err = td_thr_setgregs_p (&thread_info->private->th, gregset); |
| 955 | if (err != TD_OK) |
| 956 | error ("Cannot store general-purpose registers for thread %ld: %s", |
| 957 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
| 958 | err = td_thr_setfpregs_p (&thread_info->private->th, &fpregset); |
| 959 | if (err != TD_OK) |
| 960 | error ("Cannot store floating-point registers for thread %ld: %s", |
| 961 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
| 962 | } |
| 963 | |
| 964 | static void |
| 965 | thread_db_kill (void) |
| 966 | { |
| 967 | /* There's no need to save & restore inferior_ptid here, since the |
| 968 | inferior isn't supposed to survive this function call. */ |
| 969 | inferior_ptid = lwp_from_thread (inferior_ptid); |
| 970 | target_beneath->to_kill (); |
| 971 | } |
| 972 | |
| 973 | static void |
| 974 | thread_db_create_inferior (char *exec_file, char *allargs, char **env) |
| 975 | { |
| 976 | if (!keep_thread_db) |
| 977 | { |
| 978 | unpush_target (&thread_db_ops); |
| 979 | using_thread_db = 0; |
| 980 | } |
| 981 | |
| 982 | target_beneath->to_create_inferior (exec_file, allargs, env); |
| 983 | } |
| 984 | |
| 985 | static void |
| 986 | thread_db_post_startup_inferior (ptid_t ptid) |
| 987 | { |
| 988 | if (proc_handle.pid == 0) |
| 989 | { |
| 990 | /* The child process is now the actual multi-threaded |
| 991 | program. Snatch its process ID... */ |
| 992 | proc_handle.pid = GET_PID (ptid); |
| 993 | |
| 994 | /* ...and perform the remaining initialization steps. */ |
| 995 | enable_thread_event_reporting (); |
| 996 | thread_db_find_new_threads (); |
| 997 | } |
| 998 | } |
| 999 | |
| 1000 | static void |
| 1001 | thread_db_mourn_inferior (void) |
| 1002 | { |
| 1003 | remove_thread_event_breakpoints (); |
| 1004 | |
| 1005 | /* Forget about the child's process ID. We shouldn't need it |
| 1006 | anymore. */ |
| 1007 | proc_handle.pid = 0; |
| 1008 | |
| 1009 | target_beneath->to_mourn_inferior (); |
| 1010 | } |
| 1011 | |
| 1012 | static int |
| 1013 | thread_db_thread_alive (ptid_t ptid) |
| 1014 | { |
| 1015 | td_thrhandle_t th; |
| 1016 | td_err_e err; |
| 1017 | |
| 1018 | if (is_thread (ptid)) |
| 1019 | { |
| 1020 | struct thread_info *thread_info; |
| 1021 | thread_info = find_thread_pid (ptid); |
| 1022 | |
| 1023 | thread_db_map_id2thr (thread_info, 0); |
| 1024 | if (! thread_info->private->th_valid) |
| 1025 | return 0; |
| 1026 | |
| 1027 | err = td_thr_validate_p (&thread_info->private->th); |
| 1028 | if (err != TD_OK) |
| 1029 | return 0; |
| 1030 | |
| 1031 | if (! thread_info->private->ti_valid) |
| 1032 | { |
| 1033 | err = td_thr_get_info_p (&thread_info->private->th, &thread_info->private->ti); |
| 1034 | if (err != TD_OK) |
| 1035 | return 0; |
| 1036 | thread_info->private->ti_valid = 1; |
| 1037 | } |
| 1038 | |
| 1039 | if (thread_info->private->ti.ti_state == TD_THR_UNKNOWN |
| 1040 | || thread_info->private->ti.ti_state == TD_THR_ZOMBIE) |
| 1041 | return 0; /* A zombie thread. */ |
| 1042 | |
| 1043 | return 1; |
| 1044 | } |
| 1045 | |
| 1046 | if (target_beneath->to_thread_alive) |
| 1047 | return target_beneath->to_thread_alive (ptid); |
| 1048 | |
| 1049 | return 0; |
| 1050 | } |
| 1051 | |
| 1052 | static int |
| 1053 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) |
| 1054 | { |
| 1055 | td_thrinfo_t ti; |
| 1056 | td_err_e err; |
| 1057 | ptid_t ptid; |
| 1058 | |
| 1059 | err = td_thr_get_info_p (th_p, &ti); |
| 1060 | if (err != TD_OK) |
| 1061 | error ("find_new_threads_callback: cannot get thread info: %s", |
| 1062 | thread_db_err_str (err)); |
| 1063 | |
| 1064 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
| 1065 | return 0; /* A zombie -- ignore. */ |
| 1066 | |
| 1067 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid)); |
| 1068 | |
| 1069 | if (!in_thread_list (ptid)) |
| 1070 | attach_thread (ptid, th_p, &ti, 1); |
| 1071 | |
| 1072 | return 0; |
| 1073 | } |
| 1074 | |
| 1075 | static void |
| 1076 | thread_db_find_new_threads (void) |
| 1077 | { |
| 1078 | td_err_e err; |
| 1079 | |
| 1080 | /* Iterate over all user-space threads to discover new threads. */ |
| 1081 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, |
| 1082 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, |
| 1083 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); |
| 1084 | if (err != TD_OK) |
| 1085 | error ("Cannot find new threads: %s", thread_db_err_str (err)); |
| 1086 | } |
| 1087 | |
| 1088 | static char * |
| 1089 | thread_db_pid_to_str (ptid_t ptid) |
| 1090 | { |
| 1091 | if (is_thread (ptid)) |
| 1092 | { |
| 1093 | static char buf[64]; |
| 1094 | td_thrinfo_t *ti_p; |
| 1095 | td_err_e err; |
| 1096 | struct thread_info *thread_info; |
| 1097 | |
| 1098 | thread_info = find_thread_pid (ptid); |
| 1099 | thread_db_map_id2thr (thread_info, 0); |
| 1100 | if (! thread_info->private->th_valid) |
| 1101 | { |
| 1102 | snprintf (buf, sizeof (buf), "Thread %ld (Missing)", GET_THREAD (ptid)); |
| 1103 | return buf; |
| 1104 | } |
| 1105 | |
| 1106 | ti_p = thread_db_get_info (thread_info); |
| 1107 | |
| 1108 | if (ti_p->ti_state == TD_THR_ACTIVE && ti_p->ti_lid != 0) |
| 1109 | { |
| 1110 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", |
| 1111 | (long) ti_p->ti_tid, ti_p->ti_lid); |
| 1112 | } |
| 1113 | else |
| 1114 | { |
| 1115 | snprintf (buf, sizeof (buf), "Thread %ld (%s)", |
| 1116 | (long) ti_p->ti_tid, thread_db_state_str (ti_p->ti_state)); |
| 1117 | } |
| 1118 | |
| 1119 | return buf; |
| 1120 | } |
| 1121 | |
| 1122 | if (target_beneath->to_pid_to_str (ptid)) |
| 1123 | return target_beneath->to_pid_to_str (ptid); |
| 1124 | |
| 1125 | return normal_pid_to_str (ptid); |
| 1126 | } |
| 1127 | |
| 1128 | /* Get the address of the thread local variable in OBJFILE which is |
| 1129 | stored at OFFSET within the thread local storage for thread PTID. */ |
| 1130 | |
| 1131 | static CORE_ADDR |
| 1132 | thread_db_get_thread_local_address (ptid_t ptid, struct objfile *objfile, |
| 1133 | CORE_ADDR offset) |
| 1134 | { |
| 1135 | if (is_thread (ptid)) |
| 1136 | { |
| 1137 | int objfile_is_library = (objfile->flags & OBJF_SHARED); |
| 1138 | td_err_e err; |
| 1139 | void *address; |
| 1140 | CORE_ADDR lm; |
| 1141 | struct thread_info *thread_info; |
| 1142 | |
| 1143 | /* glibc doesn't provide the needed interface. */ |
| 1144 | if (! td_thr_tls_get_addr_p) |
| 1145 | error ("Cannot find thread-local variables in this thread library."); |
| 1146 | |
| 1147 | /* Get the address of the link map for this objfile. */ |
| 1148 | lm = svr4_fetch_objfile_link_map (objfile); |
| 1149 | |
| 1150 | /* Whoops, we couldn't find one. Bail out. */ |
| 1151 | if (!lm) |
| 1152 | { |
| 1153 | if (objfile_is_library) |
| 1154 | error ("Cannot find shared library `%s' link_map in dynamic" |
| 1155 | " linker's module list", objfile->name); |
| 1156 | else |
| 1157 | error ("Cannot find executable file `%s' link_map in dynamic" |
| 1158 | " linker's module list", objfile->name); |
| 1159 | } |
| 1160 | |
| 1161 | /* Get info about the thread. */ |
| 1162 | thread_info = find_thread_pid (ptid); |
| 1163 | thread_db_map_id2thr (thread_info, 1); |
| 1164 | |
| 1165 | /* Finally, get the address of the variable. */ |
| 1166 | err = td_thr_tls_get_addr_p (&thread_info->private->th, (void *) lm, |
| 1167 | offset, &address); |
| 1168 | |
| 1169 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
| 1170 | /* The memory hasn't been allocated, yet. */ |
| 1171 | if (err == TD_NOTALLOC) |
| 1172 | { |
| 1173 | /* Now, if libthread_db provided the initialization image's |
| 1174 | address, we *could* try to build a non-lvalue value from |
| 1175 | the initialization image. */ |
| 1176 | if (objfile_is_library) |
| 1177 | error ("The inferior has not yet allocated storage for" |
| 1178 | " thread-local variables in\n" |
| 1179 | "the shared library `%s'\n" |
| 1180 | "for the thread %ld", |
| 1181 | objfile->name, (long) GET_THREAD (ptid)); |
| 1182 | else |
| 1183 | error ("The inferior has not yet allocated storage for" |
| 1184 | " thread-local variables in\n" |
| 1185 | "the executable `%s'\n" |
| 1186 | "for the thread %ld", |
| 1187 | objfile->name, (long) GET_THREAD (ptid)); |
| 1188 | } |
| 1189 | #endif |
| 1190 | |
| 1191 | /* Something else went wrong. */ |
| 1192 | if (err != TD_OK) |
| 1193 | { |
| 1194 | if (objfile_is_library) |
| 1195 | error ("Cannot find thread-local storage for thread %ld, " |
| 1196 | "shared library %s:\n%s", |
| 1197 | (long) GET_THREAD (ptid), |
| 1198 | objfile->name, |
| 1199 | thread_db_err_str (err)); |
| 1200 | else |
| 1201 | error ("Cannot find thread-local storage for thread %ld, " |
| 1202 | "executable file %s:\n%s", |
| 1203 | (long) GET_THREAD (ptid), |
| 1204 | objfile->name, |
| 1205 | thread_db_err_str (err)); |
| 1206 | } |
| 1207 | |
| 1208 | /* Cast assuming host == target. Joy. */ |
| 1209 | return (CORE_ADDR) address; |
| 1210 | } |
| 1211 | |
| 1212 | if (target_beneath->to_get_thread_local_address) |
| 1213 | return target_beneath->to_get_thread_local_address (ptid, objfile, offset); |
| 1214 | |
| 1215 | error ("Cannot find thread-local values on this target."); |
| 1216 | } |
| 1217 | |
| 1218 | static void |
| 1219 | init_thread_db_ops (void) |
| 1220 | { |
| 1221 | thread_db_ops.to_shortname = "multi-thread"; |
| 1222 | thread_db_ops.to_longname = "multi-threaded child process."; |
| 1223 | thread_db_ops.to_doc = "Threads and pthreads support."; |
| 1224 | thread_db_ops.to_attach = thread_db_attach; |
| 1225 | thread_db_ops.to_detach = thread_db_detach; |
| 1226 | thread_db_ops.to_resume = thread_db_resume; |
| 1227 | thread_db_ops.to_wait = thread_db_wait; |
| 1228 | thread_db_ops.to_fetch_registers = thread_db_fetch_registers; |
| 1229 | thread_db_ops.to_store_registers = thread_db_store_registers; |
| 1230 | thread_db_ops.to_xfer_memory = thread_db_xfer_memory; |
| 1231 | thread_db_ops.to_kill = thread_db_kill; |
| 1232 | thread_db_ops.to_create_inferior = thread_db_create_inferior; |
| 1233 | thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior; |
| 1234 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
| 1235 | thread_db_ops.to_thread_alive = thread_db_thread_alive; |
| 1236 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
| 1237 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; |
| 1238 | thread_db_ops.to_stratum = thread_stratum; |
| 1239 | thread_db_ops.to_has_thread_control = tc_schedlock; |
| 1240 | thread_db_ops.to_get_thread_local_address |
| 1241 | = thread_db_get_thread_local_address; |
| 1242 | thread_db_ops.to_magic = OPS_MAGIC; |
| 1243 | } |
| 1244 | |
| 1245 | void |
| 1246 | _initialize_thread_db (void) |
| 1247 | { |
| 1248 | /* Only initialize the module if we can load libthread_db. */ |
| 1249 | if (thread_db_load ()) |
| 1250 | { |
| 1251 | init_thread_db_ops (); |
| 1252 | add_target (&thread_db_ops); |
| 1253 | |
| 1254 | /* Add ourselves to objfile event chain. */ |
| 1255 | target_new_objfile_chain = target_new_objfile_hook; |
| 1256 | target_new_objfile_hook = thread_db_new_objfile; |
| 1257 | } |
| 1258 | } |