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fb0e1ba7 MK |
1 | /* libthread_db assisted debugging support, generic parts. |
2 | Copyright 1999, 2000 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
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 "gdbthread.h" | |
29 | #include "inferior.h" | |
30 | #include "target.h" | |
31 | ||
32 | #ifndef LIBTHREAD_DB_SO | |
33 | #define LIBTHREAD_DB_SO "libthread_db.so.1" | |
34 | #endif | |
35 | ||
36 | /* If we're running on Linux, we must explicitly attach to any new threads. */ | |
37 | ||
38 | /* FIXME: There is certainly some room for improvements: | |
39 | - Cache LWP ids. | |
40 | - Bypass libthread_db when fetching or storing registers for | |
41 | threads bound to a LWP. */ | |
42 | ||
43 | /* This module's target vector. */ | |
44 | static struct target_ops thread_db_ops; | |
45 | ||
46 | /* The target vector that we call for things this module can't handle. */ | |
47 | static struct target_ops *target_beneath; | |
48 | ||
49 | /* Pointer to the next function on the objfile event chain. */ | |
50 | static void (*target_new_objfile_chain) (struct objfile *objfile); | |
51 | ||
52 | /* Non-zero if we're using this module's target vector. */ | |
53 | static int using_thread_db; | |
54 | ||
55 | /* Non-zero if we have determined the signals used by the threads | |
56 | library. */ | |
57 | static int thread_signals; | |
58 | static sigset_t thread_stop_set; | |
59 | static sigset_t thread_print_set; | |
60 | ||
61 | /* Structure that identifies the child process for the | |
62 | <proc_service.h> interface. */ | |
63 | static struct ps_prochandle proc_handle; | |
64 | ||
65 | /* Connection to the libthread_db library. */ | |
66 | static td_thragent_t *thread_agent; | |
67 | ||
68 | /* Pointers to the libthread_db functions. */ | |
69 | ||
70 | static td_err_e (*td_init_p) (void); | |
71 | ||
72 | static td_err_e (*td_ta_new_p) (struct ps_prochandle *ps, td_thragent_t **ta); | |
73 | static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, | |
74 | td_thrhandle_t *__th); | |
75 | static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, | |
76 | td_thrhandle_t *th); | |
77 | static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
78 | td_thr_iter_f *callback, | |
79 | void *cbdata_p, td_thr_state_e state, | |
80 | int ti_pri, sigset_t *ti_sigmask_p, | |
81 | unsigned int ti_user_flags); | |
82 | static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
83 | td_event_e event, td_notify_t *ptr); | |
84 | static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
85 | td_thr_events_t *event); | |
86 | static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
87 | td_event_msg_t *msg); | |
88 | ||
89 | static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
90 | static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
91 | td_thrinfo_t *infop); | |
92 | static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th, | |
93 | gdb_prfpregset_t *regset); | |
94 | static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th, | |
95 | prgregset_t gregs); | |
96 | static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th, | |
97 | const gdb_prfpregset_t *fpregs); | |
98 | static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th, | |
99 | prgregset_t gregs); | |
100 | static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); | |
101 | ||
102 | /* Location of the thread creation event breakpoint. The code at this | |
103 | location in the child process will be called by the pthread library | |
104 | whenever a new thread is created. By setting a special breakpoint | |
105 | at this location, GDB can detect when a new thread is created. We | |
106 | obtain this location via the td_ta_event_addr call. */ | |
107 | static CORE_ADDR td_create_bp_addr; | |
108 | ||
109 | /* Location of the thread death event breakpoint. */ | |
110 | static CORE_ADDR td_death_bp_addr; | |
111 | ||
112 | /* Prototypes for local functions. */ | |
113 | static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); | |
114 | \f | |
115 | ||
116 | /* Building process ids. */ | |
117 | ||
118 | #ifndef TIDGET | |
119 | #define TIDGET(PID) (((PID) & 0x7fffffff) >> 16) | |
120 | #define PIDGET(PID) (((PID) & 0xffff)) | |
121 | #define MERGEPID(PID, TID) (((PID) & 0xffff) | ((TID) << 16)) | |
122 | #endif | |
123 | ||
124 | #define THREAD_FLAG 0x80000000 | |
125 | ||
126 | #define is_lwp(pid) (((pid) & THREAD_FLAG) == 0 && TIDGET (pid)) | |
127 | #define is_thread(pid) ((pid) & THREAD_FLAG) | |
128 | ||
129 | #define GET_PID(pid) PIDGET (pid) | |
130 | #define GET_LWP(pid) TIDGET (pid) | |
131 | #define GET_THREAD(pid) TIDGET (pid) | |
132 | ||
133 | #define BUILD_LWP(tid, pid) MERGEPID (pid, tid) | |
134 | #define BUILD_THREAD(tid, pid) (MERGEPID (pid, tid) | THREAD_FLAG) | |
135 | \f | |
136 | ||
137 | struct private_thread_info | |
138 | { | |
139 | /* Cached LWP id. Must come first, see lin-lwp.c. */ | |
140 | lwpid_t lwpid; | |
141 | }; | |
142 | ||
143 | \f | |
144 | /* Helper functions. */ | |
145 | ||
146 | static void | |
147 | restore_inferior_pid (void *arg) | |
148 | { | |
149 | int *saved_pid_ptr = arg; | |
150 | inferior_pid = *saved_pid_ptr; | |
b8c9b27d | 151 | xfree (arg); |
fb0e1ba7 MK |
152 | } |
153 | ||
154 | static struct cleanup * | |
155 | save_inferior_pid (void) | |
156 | { | |
157 | int *saved_pid_ptr; | |
158 | ||
159 | saved_pid_ptr = xmalloc (sizeof (int)); | |
160 | *saved_pid_ptr = inferior_pid; | |
161 | return make_cleanup (restore_inferior_pid, saved_pid_ptr); | |
162 | } | |
163 | \f | |
164 | ||
165 | static char * | |
166 | thread_db_err_str (td_err_e err) | |
167 | { | |
168 | static char buf[64]; | |
169 | ||
170 | switch (err) | |
171 | { | |
172 | case TD_OK: | |
173 | return "generic 'call succeeded'"; | |
174 | case TD_ERR: | |
175 | return "generic error"; | |
176 | case TD_NOTHR: | |
177 | return "no thread to satisfy query"; | |
178 | case TD_NOSV: | |
179 | return "no sync handle to satisfy query"; | |
180 | case TD_NOLWP: | |
181 | return "no LWP to satisfy query"; | |
182 | case TD_BADPH: | |
183 | return "invalid process handle"; | |
184 | case TD_BADTH: | |
185 | return "invalid thread handle"; | |
186 | case TD_BADSH: | |
187 | return "invalid synchronization handle"; | |
188 | case TD_BADTA: | |
189 | return "invalid thread agent"; | |
190 | case TD_BADKEY: | |
191 | return "invalid key"; | |
192 | case TD_NOMSG: | |
193 | return "no event message for getmsg"; | |
194 | case TD_NOFPREGS: | |
195 | return "FPU register set not available"; | |
196 | case TD_NOLIBTHREAD: | |
197 | return "application not linked with libthread"; | |
198 | case TD_NOEVENT: | |
199 | return "requested event is not supported"; | |
200 | case TD_NOCAPAB: | |
201 | return "capability not available"; | |
202 | case TD_DBERR: | |
203 | return "debugger service failed"; | |
204 | case TD_NOAPLIC: | |
205 | return "operation not applicable to"; | |
206 | case TD_NOTSD: | |
207 | return "no thread-specific data for this thread"; | |
208 | case TD_MALLOC: | |
209 | return "malloc failed"; | |
210 | case TD_PARTIALREG: | |
211 | return "only part of register set was written/read"; | |
212 | case TD_NOXREGS: | |
213 | return "X register set not available for this thread"; | |
214 | default: | |
215 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
216 | return buf; | |
217 | } | |
218 | } | |
219 | ||
220 | static char * | |
221 | thread_db_state_str (td_thr_state_e state) | |
222 | { | |
223 | static char buf[64]; | |
224 | ||
225 | switch (state) | |
226 | { | |
227 | case TD_THR_STOPPED: | |
228 | return "stopped by debugger"; | |
229 | case TD_THR_RUN: | |
230 | return "runnable"; | |
231 | case TD_THR_ACTIVE: | |
232 | return "active"; | |
233 | case TD_THR_ZOMBIE: | |
234 | return "zombie"; | |
235 | case TD_THR_SLEEP: | |
236 | return "sleeping"; | |
237 | case TD_THR_STOPPED_ASLEEP: | |
238 | return "stopped by debugger AND blocked"; | |
239 | default: | |
240 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
241 | return buf; | |
242 | } | |
243 | } | |
244 | \f | |
245 | ||
246 | /* Convert between user-level thread ids and LWP ids. */ | |
247 | ||
248 | static int | |
249 | thread_from_lwp (int pid) | |
250 | { | |
251 | td_thrinfo_t ti; | |
252 | td_thrhandle_t th; | |
253 | td_err_e err; | |
254 | ||
255 | if (GET_LWP (pid) == 0) | |
256 | pid = BUILD_LWP (pid, pid); | |
257 | ||
258 | gdb_assert (is_lwp (pid)); | |
259 | ||
260 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (pid), &th); | |
261 | if (err != TD_OK) | |
262 | error ("Cannot find user-level thread for LWP %d: %s", | |
263 | GET_LWP (pid), thread_db_err_str (err)); | |
264 | ||
265 | err = td_thr_get_info_p (&th, &ti); | |
266 | if (err != TD_OK) | |
267 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
268 | ||
269 | return BUILD_THREAD (ti.ti_tid, GET_PID (pid)); | |
270 | } | |
271 | ||
272 | static int | |
273 | lwp_from_thread (int pid) | |
274 | { | |
275 | td_thrinfo_t ti; | |
276 | td_thrhandle_t th; | |
277 | td_err_e err; | |
278 | ||
279 | if (! is_thread (pid)) | |
280 | return pid; | |
281 | ||
282 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th); | |
283 | if (err != TD_OK) | |
284 | error ("Cannot find thread %ld: %s", | |
285 | (long) GET_THREAD (pid), thread_db_err_str (err)); | |
286 | ||
287 | err = td_thr_get_info_p (&th, &ti); | |
288 | if (err != TD_OK) | |
289 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
290 | ||
291 | return BUILD_LWP (ti.ti_lid, GET_PID (pid)); | |
292 | } | |
293 | \f | |
294 | ||
295 | void | |
296 | thread_db_init (struct target_ops *target) | |
297 | { | |
298 | target_beneath = target; | |
299 | } | |
300 | ||
301 | static int | |
302 | thread_db_load (void) | |
303 | { | |
304 | void *handle; | |
305 | td_err_e err; | |
306 | ||
307 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); | |
308 | if (handle == NULL) | |
309 | return 0; | |
310 | ||
311 | /* Initialize pointers to the dynamic library functions we will use. | |
312 | Essential functions first. */ | |
313 | ||
314 | td_init_p = dlsym (handle, "td_init"); | |
315 | if (td_init_p == NULL) | |
316 | return 0; | |
317 | ||
318 | td_ta_new_p = dlsym (handle, "td_ta_new"); | |
319 | if (td_ta_new_p == NULL) | |
320 | return 0; | |
321 | ||
322 | td_ta_map_id2thr_p = dlsym (handle, "td_ta_map_id2thr"); | |
323 | if (td_ta_map_id2thr_p == NULL) | |
324 | return 0; | |
325 | ||
326 | td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr"); | |
327 | if (td_ta_map_lwp2thr_p == NULL) | |
328 | return 0; | |
329 | ||
330 | td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter"); | |
331 | if (td_ta_thr_iter_p == NULL) | |
332 | return 0; | |
333 | ||
334 | td_thr_validate_p = dlsym (handle, "td_thr_validate"); | |
335 | if (td_thr_validate_p == NULL) | |
336 | return 0; | |
337 | ||
338 | td_thr_get_info_p = dlsym (handle, "td_thr_get_info"); | |
339 | if (td_thr_get_info_p == NULL) | |
340 | return 0; | |
341 | ||
342 | td_thr_getfpregs_p = dlsym (handle, "td_thr_getfpregs"); | |
343 | if (td_thr_getfpregs_p == NULL) | |
344 | return 0; | |
345 | ||
346 | td_thr_getgregs_p = dlsym (handle, "td_thr_getgregs"); | |
347 | if (td_thr_getgregs_p == NULL) | |
348 | return 0; | |
349 | ||
350 | td_thr_setfpregs_p = dlsym (handle, "td_thr_setfpregs"); | |
351 | if (td_thr_setfpregs_p == NULL) | |
352 | return 0; | |
353 | ||
354 | td_thr_setgregs_p = dlsym (handle, "td_thr_setgregs"); | |
355 | if (td_thr_setgregs_p == NULL) | |
356 | return 0; | |
357 | ||
358 | /* Initialize the library. */ | |
359 | err = td_init_p (); | |
360 | if (err != TD_OK) | |
361 | { | |
362 | warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err)); | |
363 | return 0; | |
364 | } | |
365 | ||
366 | /* These are not essential. */ | |
367 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); | |
368 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); | |
369 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); | |
370 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); | |
371 | ||
372 | return 1; | |
373 | } | |
374 | ||
375 | static void | |
376 | enable_thread_event_reporting (void) | |
377 | { | |
378 | td_thr_events_t events; | |
379 | td_notify_t notify; | |
380 | td_err_e err; | |
381 | ||
382 | /* We cannot use the thread event reporting facility if these | |
383 | functions aren't available. */ | |
384 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL | |
385 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) | |
386 | return; | |
387 | ||
388 | /* Set the process wide mask saying which events we're interested in. */ | |
389 | td_event_emptyset (&events); | |
390 | td_event_addset (&events, TD_CREATE); | |
391 | #if 0 | |
392 | /* FIXME: kettenis/2000-04-23: The event reporting facility is | |
393 | broken for TD_DEATH events in glibc 2.1.3, so don't enable it for | |
394 | now. */ | |
395 | td_event_addset (&events, TD_DEATH); | |
396 | #endif | |
397 | ||
398 | err = td_ta_set_event_p (thread_agent, &events); | |
399 | if (err != TD_OK) | |
400 | { | |
401 | warning ("Unable to set global thread event mask: %s", | |
402 | thread_db_err_str (err)); | |
403 | return; | |
404 | } | |
405 | ||
406 | /* Delete previous thread event breakpoints, if any. */ | |
407 | remove_thread_event_breakpoints (); | |
408 | ||
409 | /* Get address for thread creation breakpoint. */ | |
410 | err = td_ta_event_addr_p (thread_agent, TD_CREATE, ¬ify); | |
411 | if (err != TD_OK) | |
412 | { | |
413 | warning ("Unable to get location for thread creation breakpoint: %s", | |
414 | thread_db_err_str (err)); | |
415 | return; | |
416 | } | |
417 | ||
418 | /* Set up the breakpoint. */ | |
419 | td_create_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
420 | create_thread_event_breakpoint (td_create_bp_addr); | |
421 | ||
422 | /* Get address for thread death breakpoint. */ | |
423 | err = td_ta_event_addr_p (thread_agent, TD_DEATH, ¬ify); | |
424 | if (err != TD_OK) | |
425 | { | |
426 | warning ("Unable to get location for thread creation breakpoint: %s", | |
427 | thread_db_err_str (err)); | |
428 | return; | |
429 | } | |
430 | ||
431 | /* Set up the breakpoint. */ | |
432 | td_death_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
433 | create_thread_event_breakpoint (td_death_bp_addr); | |
434 | } | |
435 | ||
436 | static void | |
437 | disable_thread_event_reporting (void) | |
438 | { | |
439 | td_thr_events_t events; | |
440 | ||
441 | /* Set the process wide mask saying we aren't interested in any | |
442 | events anymore. */ | |
443 | td_event_emptyset (&events); | |
444 | td_ta_set_event_p (thread_agent, &events); | |
445 | ||
446 | /* Delete thread event breakpoints, if any. */ | |
447 | remove_thread_event_breakpoints (); | |
448 | td_create_bp_addr = 0; | |
449 | td_death_bp_addr = 0; | |
450 | } | |
451 | ||
452 | static void | |
453 | check_thread_signals (void) | |
454 | { | |
455 | #ifdef GET_THREAD_SIGNALS | |
456 | if (! thread_signals) | |
457 | { | |
458 | sigset_t mask; | |
459 | int i; | |
460 | ||
461 | GET_THREAD_SIGNALS (&mask); | |
462 | sigemptyset (&thread_stop_set); | |
463 | sigemptyset (&thread_print_set); | |
464 | ||
465 | for (i = 0; i < NSIG; i++) | |
466 | { | |
467 | if (sigismember (&mask, i)) | |
468 | { | |
469 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
470 | sigaddset (&thread_stop_set, i); | |
471 | if (signal_print_update (target_signal_from_host (i), 0)) | |
472 | sigaddset (&thread_print_set, i); | |
473 | thread_signals = 1; | |
474 | } | |
475 | } | |
476 | } | |
477 | #endif | |
478 | } | |
479 | ||
480 | static void | |
481 | disable_thread_signals (void) | |
482 | { | |
483 | #ifdef GET_THREAD_SIGNALS | |
484 | if (thread_signals) | |
485 | { | |
486 | int i; | |
487 | ||
488 | for (i = 0; i < NSIG; i++) | |
489 | { | |
490 | if (sigismember (&thread_stop_set, i)) | |
491 | signal_stop_update (target_signal_from_host (i), 1); | |
492 | if (sigismember (&thread_print_set, i)) | |
493 | signal_print_update (target_signal_from_host (i), 1); | |
494 | } | |
495 | ||
496 | thread_signals = 0; | |
497 | } | |
498 | #endif | |
499 | } | |
500 | ||
501 | static void | |
502 | thread_db_push_target (void) | |
503 | { | |
504 | using_thread_db = 1; | |
505 | ||
506 | /* Push this target vector. */ | |
507 | push_target (&thread_db_ops); | |
508 | ||
509 | enable_thread_event_reporting (); | |
510 | } | |
511 | ||
512 | static void | |
513 | thread_db_unpush_target (void) | |
514 | { | |
515 | /* Unpush this target vector. */ | |
516 | unpush_target (&thread_db_ops); | |
517 | ||
518 | using_thread_db = 0; | |
519 | } | |
520 | ||
521 | static void | |
522 | thread_db_new_objfile (struct objfile *objfile) | |
523 | { | |
524 | td_err_e err; | |
525 | ||
526 | if (using_thread_db) | |
527 | /* Nothing to do. The thread library was already detected and the | |
528 | target vector was already activated. */ | |
529 | goto quit; | |
530 | ||
531 | if (objfile == NULL) | |
532 | /* Un-interesting object file. */ | |
533 | goto quit; | |
534 | ||
535 | /* Initialize the structure that identifies the child process. */ | |
536 | proc_handle.pid = GET_PID (inferior_pid); | |
537 | ||
538 | /* Now attempt to open a connection to the thread library running in | |
539 | the child process. */ | |
540 | err = td_ta_new_p (&proc_handle, &thread_agent); | |
541 | switch (err) | |
542 | { | |
543 | case TD_NOLIBTHREAD: | |
544 | /* No thread library found in the child process, probably | |
545 | because the child process isn't running yet. */ | |
546 | break; | |
547 | ||
548 | case TD_OK: | |
549 | /* The thread library was detected in the child; we go live now! */ | |
550 | thread_db_push_target (); | |
551 | ||
552 | /* Find all user-space threads. */ | |
553 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, | |
554 | &inferior_pid, TD_THR_ANY_STATE, | |
555 | TD_THR_LOWEST_PRIORITY, TD_SIGNO_MASK, | |
556 | TD_THR_ANY_USER_FLAGS); | |
557 | if (err != TD_OK) | |
558 | error ("Finding new threads failed: %s", thread_db_err_str (err)); | |
559 | break; | |
560 | ||
561 | default: | |
562 | warning ("Cannot initialize thread debugging library: %s", | |
563 | thread_db_err_str (err)); | |
564 | break; | |
565 | } | |
566 | ||
567 | quit: | |
568 | if (target_new_objfile_chain) | |
569 | target_new_objfile_chain (objfile); | |
570 | } | |
571 | ||
572 | static void | |
573 | attach_thread (int pid, const td_thrhandle_t *th_p, | |
574 | const td_thrinfo_t *ti_p, int verbose) | |
575 | { | |
576 | struct thread_info *tp; | |
577 | td_err_e err; | |
578 | ||
579 | check_thread_signals (); | |
580 | ||
581 | if (verbose) | |
582 | printf_unfiltered ("[New %s]\n", target_pid_to_str (pid)); | |
583 | ||
584 | /* Add the thread to GDB's thread list. */ | |
585 | tp = add_thread (pid); | |
586 | tp->private = xmalloc (sizeof (struct private_thread_info)); | |
587 | tp->private->lwpid = ti_p->ti_lid; | |
588 | ||
589 | /* Under Linux, we have to attach to each and every thread. */ | |
590 | #ifdef ATTACH_LWP | |
591 | if (ti_p->ti_lid != GET_PID (pid)) | |
592 | ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (pid)), 0); | |
593 | #endif | |
594 | ||
595 | /* Enable thread event reporting for this thread. */ | |
596 | err = td_thr_event_enable_p (th_p, 1); | |
597 | if (err != TD_OK) | |
598 | error ("Cannot enable thread event reporting for %s: %s", | |
599 | target_pid_to_str (pid), thread_db_err_str (err)); | |
600 | } | |
601 | ||
602 | static void | |
603 | detach_thread (int pid, int verbose) | |
604 | { | |
605 | if (verbose) | |
606 | printf_unfiltered ("[%s exited]\n", target_pid_to_str (pid)); | |
607 | } | |
608 | ||
609 | static void | |
610 | thread_db_detach (char *args, int from_tty) | |
611 | { | |
612 | disable_thread_event_reporting (); | |
613 | thread_db_unpush_target (); | |
614 | ||
615 | target_beneath->to_detach (args, from_tty); | |
616 | } | |
617 | ||
618 | static void | |
619 | thread_db_resume (int pid, int step, enum target_signal signo) | |
620 | { | |
621 | struct cleanup *old_chain = save_inferior_pid (); | |
622 | ||
623 | if (pid == -1) | |
624 | inferior_pid = lwp_from_thread (inferior_pid); | |
625 | else if (is_thread (pid)) | |
626 | pid = lwp_from_thread (pid); | |
627 | ||
628 | target_beneath->to_resume (pid, step, signo); | |
629 | ||
630 | do_cleanups (old_chain); | |
631 | } | |
632 | ||
633 | /* Check if PID is currently stopped at the location of a thread event | |
634 | breakpoint location. If it is, read the event message and act upon | |
635 | the event. */ | |
636 | ||
637 | static void | |
638 | check_event (int pid) | |
639 | { | |
640 | td_event_msg_t msg; | |
641 | td_thrinfo_t ti; | |
642 | td_err_e err; | |
643 | CORE_ADDR stop_pc; | |
644 | ||
645 | /* Bail out early if we're not at a thread event breakpoint. */ | |
646 | stop_pc = read_pc_pid (pid) - DECR_PC_AFTER_BREAK; | |
647 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) | |
648 | return; | |
649 | ||
650 | err = td_ta_event_getmsg_p (thread_agent, &msg); | |
651 | if (err != TD_OK) | |
652 | { | |
653 | if (err == TD_NOMSG) | |
654 | return; | |
655 | ||
656 | error ("Cannot get thread event message: %s", thread_db_err_str (err)); | |
657 | } | |
658 | ||
659 | err = td_thr_get_info_p (msg.th_p, &ti); | |
660 | if (err != TD_OK) | |
661 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
662 | ||
663 | pid = BUILD_THREAD (ti.ti_tid, GET_PID (pid)); | |
664 | ||
665 | switch (msg.event) | |
666 | { | |
667 | case TD_CREATE: | |
668 | #if 0 | |
669 | /* FIXME: kettenis/2000-08-26: Since we use td_ta_event_getmsg, | |
670 | there is no guarantee that the breakpoint will match the | |
671 | event. Should we use td_thr_event_getmsg instead? */ | |
672 | ||
673 | if (stop_pc != td_create_bp_addr) | |
674 | error ("Thread creation event doesn't match breakpoint."); | |
675 | #endif | |
676 | ||
677 | if (in_thread_list (pid)) | |
678 | error ("Spurious thread creation event."); | |
679 | ||
680 | attach_thread (pid, msg.th_p, &ti, 1); | |
681 | return; | |
682 | ||
683 | case TD_DEATH: | |
684 | #if 0 | |
685 | /* FIXME: See TD_CREATE. */ | |
686 | ||
687 | if (stop_pc != td_death_bp_addr) | |
688 | error ("Thread death event doesn't match breakpoint."); | |
689 | #endif | |
690 | ||
691 | if (! in_thread_list (pid)) | |
692 | error ("Spurious thread death event."); | |
693 | ||
694 | detach_thread (pid, 1); | |
695 | return; | |
696 | ||
697 | default: | |
698 | error ("Spurious thread event."); | |
699 | } | |
700 | } | |
701 | ||
702 | static int | |
703 | thread_db_wait (int pid, struct target_waitstatus *ourstatus) | |
704 | { | |
705 | extern int trap_pid; | |
706 | ||
707 | if (pid != -1 && is_thread (pid)) | |
708 | pid = lwp_from_thread (pid); | |
709 | ||
710 | pid = target_beneath->to_wait (pid, ourstatus); | |
711 | ||
712 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) | |
713 | return -1; | |
714 | ||
715 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED | |
716 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
717 | /* Check for a thread event. */ | |
718 | check_event (pid); | |
719 | ||
720 | if (trap_pid) | |
721 | trap_pid = thread_from_lwp (trap_pid); | |
722 | ||
723 | return thread_from_lwp (pid); | |
724 | } | |
725 | ||
726 | static int | |
727 | thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
728 | struct target_ops *target) | |
729 | { | |
730 | struct cleanup *old_chain = save_inferior_pid (); | |
731 | int xfer; | |
732 | ||
733 | if (is_thread (inferior_pid)) | |
734 | { | |
735 | /* FIXME: This seems to be necessary to make sure breakpoints | |
736 | are removed. */ | |
737 | if (! target_thread_alive (inferior_pid)) | |
738 | inferior_pid = GET_PID (inferior_pid); | |
739 | else | |
740 | inferior_pid = lwp_from_thread (inferior_pid); | |
741 | } | |
742 | ||
743 | xfer = target_beneath->to_xfer_memory (memaddr, myaddr, len, write, target); | |
744 | ||
745 | do_cleanups (old_chain); | |
746 | return xfer; | |
747 | } | |
748 | ||
749 | static void | |
750 | thread_db_fetch_registers (int regno) | |
751 | { | |
752 | td_thrhandle_t th; | |
753 | prgregset_t gregset; | |
754 | gdb_prfpregset_t fpregset; | |
755 | td_err_e err; | |
756 | ||
757 | if (! is_thread (inferior_pid)) | |
758 | { | |
759 | /* Pass the request to the target beneath us. */ | |
760 | target_beneath->to_fetch_registers (regno); | |
761 | return; | |
762 | } | |
763 | ||
764 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_pid), &th); | |
765 | if (err != TD_OK) | |
766 | error ("Cannot find thread %ld: %s", | |
767 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
768 | ||
769 | err = td_thr_getgregs_p (&th, gregset); | |
770 | if (err != TD_OK) | |
771 | error ("Cannot fetch general-purpose registers for thread %ld: %s", | |
772 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
773 | ||
774 | err = td_thr_getfpregs_p (&th, &fpregset); | |
775 | if (err != TD_OK) | |
776 | error ("Cannot get floating-point registers for thread %ld: %s", | |
777 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
778 | ||
779 | /* Note that we must call supply_gregset after calling the thread_db | |
780 | routines because the thread_db routines call ps_lgetgregs and | |
781 | friends which clobber GDB's register cache. */ | |
782 | supply_gregset ((gdb_gregset_t *) gregset); | |
783 | supply_fpregset (&fpregset); | |
784 | } | |
785 | ||
786 | static void | |
787 | thread_db_store_registers (int regno) | |
788 | { | |
789 | td_thrhandle_t th; | |
790 | prgregset_t gregset; | |
791 | gdb_prfpregset_t fpregset; | |
792 | td_err_e err; | |
793 | ||
794 | if (! is_thread (inferior_pid)) | |
795 | { | |
796 | /* Pass the request to the target beneath us. */ | |
797 | target_beneath->to_store_registers (regno); | |
798 | return; | |
799 | } | |
800 | ||
801 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_pid), &th); | |
802 | if (err != TD_OK) | |
803 | error ("Cannot find thread %ld: %s", | |
804 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
805 | ||
806 | if (regno != -1) | |
807 | { | |
808 | char raw[MAX_REGISTER_RAW_SIZE]; | |
809 | ||
810 | read_register_gen (regno, raw); | |
811 | thread_db_fetch_registers (-1); | |
812 | supply_register (regno, raw); | |
813 | } | |
814 | ||
815 | fill_gregset ((gdb_gregset_t *) gregset, -1); | |
816 | fill_fpregset (&fpregset, -1); | |
817 | ||
818 | err = td_thr_setgregs_p (&th, gregset); | |
819 | if (err != TD_OK) | |
820 | error ("Cannot store general-purpose registers for thread %ld: %s", | |
821 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
822 | err = td_thr_setfpregs_p (&th, &fpregset); | |
823 | if (err != TD_OK) | |
824 | error ("Cannot store floating-point registers for thread %ld: %s", | |
825 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
826 | } | |
827 | ||
828 | static void | |
829 | thread_db_kill (void) | |
830 | { | |
831 | target_beneath->to_kill (); | |
832 | } | |
833 | ||
834 | static void | |
835 | thread_db_create_inferior (char *exec_file, char *allargs, char **env) | |
836 | { | |
837 | /* We never want to actually create the inferior! If this is ever | |
838 | called, it means we were on the target stack when the user said | |
839 | "run". But we don't want to be on the new inferior's target | |
840 | stack until the libthread_db connection is ready to be made. So | |
841 | we unpush ourselves from the stack, and then invoke | |
842 | find_default_create_inferior, which will invoke the appropriate | |
843 | process_stratum target to do the create. */ | |
844 | ||
845 | thread_db_unpush_target (); | |
846 | ||
847 | find_default_create_inferior (exec_file, allargs, env); | |
848 | } | |
849 | ||
850 | static void | |
851 | thread_db_mourn_inferior (void) | |
852 | { | |
853 | remove_thread_event_breakpoints (); | |
854 | thread_db_unpush_target (); | |
855 | ||
856 | target_beneath->to_mourn_inferior (); | |
857 | } | |
858 | ||
859 | static int | |
860 | thread_db_thread_alive (int pid) | |
861 | { | |
862 | if (is_thread (pid)) | |
863 | { | |
864 | td_thrhandle_t th; | |
865 | td_err_e err; | |
866 | ||
867 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th); | |
868 | if (err != TD_OK) | |
869 | return 0; | |
870 | ||
871 | err = td_thr_validate_p (&th); | |
872 | if (err != TD_OK) | |
873 | return 0; | |
874 | ||
875 | return 1; | |
876 | } | |
877 | ||
878 | if (target_beneath->to_thread_alive) | |
879 | return target_beneath->to_thread_alive (pid); | |
880 | ||
881 | return 0; | |
882 | } | |
883 | ||
884 | static int | |
885 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
886 | { | |
887 | td_thrinfo_t ti; | |
888 | td_err_e err; | |
889 | int pid; | |
890 | ||
891 | err = td_thr_get_info_p (th_p, &ti); | |
892 | if (err != TD_OK) | |
893 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
894 | ||
895 | pid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_pid)); | |
896 | ||
897 | if (! in_thread_list (pid)) | |
898 | attach_thread (pid, th_p, &ti, 1); | |
899 | ||
900 | return 0; | |
901 | } | |
902 | ||
903 | static void | |
904 | thread_db_find_new_threads (void) | |
905 | { | |
906 | td_err_e err; | |
907 | ||
908 | /* Iterate over all user-space threads to discover new threads. */ | |
909 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, | |
910 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
911 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
912 | if (err != TD_OK) | |
913 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
914 | } | |
915 | ||
916 | static char * | |
917 | thread_db_pid_to_str (int pid) | |
918 | { | |
919 | if (is_thread (pid)) | |
920 | { | |
921 | static char buf[64]; | |
922 | td_thrhandle_t th; | |
923 | td_thrinfo_t ti; | |
924 | td_err_e err; | |
925 | ||
926 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th); | |
927 | if (err != TD_OK) | |
928 | error ("Cannot find thread %ld: %s", | |
929 | (long) GET_THREAD (pid), thread_db_err_str (err)); | |
930 | ||
931 | err = td_thr_get_info_p (&th, &ti); | |
932 | if (err != TD_OK) | |
933 | error ("Cannot get thread info for thread %ld: %s", | |
934 | (long) GET_THREAD (pid), thread_db_err_str (err)); | |
935 | ||
936 | if (ti.ti_state == TD_THR_ACTIVE && ti.ti_lid != 0) | |
937 | { | |
938 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", | |
939 | (long) ti.ti_tid, ti.ti_lid); | |
940 | } | |
941 | else | |
942 | { | |
943 | snprintf (buf, sizeof (buf), "Thread %ld (%s)", | |
944 | (long) ti.ti_tid, thread_db_state_str (ti.ti_state)); | |
945 | } | |
946 | ||
947 | return buf; | |
948 | } | |
949 | ||
950 | if (target_beneath->to_pid_to_str (pid)) | |
951 | return target_beneath->to_pid_to_str (pid); | |
952 | ||
953 | return normal_pid_to_str (pid); | |
954 | } | |
955 | ||
956 | static void | |
957 | init_thread_db_ops (void) | |
958 | { | |
959 | thread_db_ops.to_shortname = "multi-thread"; | |
960 | thread_db_ops.to_longname = "multi-threaded child process."; | |
961 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
962 | thread_db_ops.to_detach = thread_db_detach; | |
963 | thread_db_ops.to_resume = thread_db_resume; | |
964 | thread_db_ops.to_wait = thread_db_wait; | |
965 | thread_db_ops.to_fetch_registers = thread_db_fetch_registers; | |
966 | thread_db_ops.to_store_registers = thread_db_store_registers; | |
967 | thread_db_ops.to_xfer_memory = thread_db_xfer_memory; | |
968 | thread_db_ops.to_kill = thread_db_kill; | |
969 | thread_db_ops.to_create_inferior = thread_db_create_inferior; | |
970 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; | |
971 | thread_db_ops.to_thread_alive = thread_db_thread_alive; | |
972 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; | |
973 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
974 | thread_db_ops.to_stratum = thread_stratum; | |
975 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
976 | thread_db_ops.to_magic = OPS_MAGIC; | |
977 | } | |
978 | ||
979 | void | |
980 | _initialize_thread_db (void) | |
981 | { | |
982 | /* Only initialize the module if we can load libthread_db. */ | |
983 | if (thread_db_load ()) | |
984 | { | |
985 | init_thread_db_ops (); | |
986 | add_target (&thread_db_ops); | |
987 | ||
988 | /* Add ourselves to objfile event chain. */ | |
989 | target_new_objfile_chain = target_new_objfile_hook; | |
990 | target_new_objfile_hook = thread_db_new_objfile; | |
991 | } | |
992 | } |