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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
4e052eda | 2 | Copyright 1999, 2000, 2001 Free Software Foundation, Inc. |
fb0e1ba7 MK |
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 | ||
bda9cb72 | 28 | #include "bfd.h" |
fb0e1ba7 MK |
29 | #include "gdbthread.h" |
30 | #include "inferior.h" | |
bda9cb72 MK |
31 | #include "symfile.h" |
32 | #include "objfiles.h" | |
fb0e1ba7 | 33 | #include "target.h" |
4e052eda | 34 | #include "regcache.h" |
fb0e1ba7 MK |
35 | |
36 | #ifndef LIBTHREAD_DB_SO | |
37 | #define LIBTHREAD_DB_SO "libthread_db.so.1" | |
38 | #endif | |
39 | ||
40 | /* If we're running on Linux, we must explicitly attach to any new threads. */ | |
41 | ||
42 | /* FIXME: There is certainly some room for improvements: | |
43 | - Cache LWP ids. | |
44 | - Bypass libthread_db when fetching or storing registers for | |
45 | threads bound to a LWP. */ | |
46 | ||
47 | /* This module's target vector. */ | |
48 | static struct target_ops thread_db_ops; | |
49 | ||
50 | /* The target vector that we call for things this module can't handle. */ | |
51 | static struct target_ops *target_beneath; | |
52 | ||
53 | /* Pointer to the next function on the objfile event chain. */ | |
54 | static void (*target_new_objfile_chain) (struct objfile *objfile); | |
55 | ||
56 | /* Non-zero if we're using this module's target vector. */ | |
57 | static int using_thread_db; | |
58 | ||
bda9cb72 MK |
59 | /* Non-zero if we musn't deactivate this module's target vector. */ |
60 | static int keep_thread_db; | |
61 | ||
fb0e1ba7 MK |
62 | /* Non-zero if we have determined the signals used by the threads |
63 | library. */ | |
64 | static int thread_signals; | |
65 | static sigset_t thread_stop_set; | |
66 | static sigset_t thread_print_set; | |
67 | ||
68 | /* Structure that identifies the child process for the | |
69 | <proc_service.h> interface. */ | |
70 | static struct ps_prochandle proc_handle; | |
71 | ||
72 | /* Connection to the libthread_db library. */ | |
73 | static td_thragent_t *thread_agent; | |
74 | ||
75 | /* Pointers to the libthread_db functions. */ | |
76 | ||
77 | static td_err_e (*td_init_p) (void); | |
78 | ||
79 | static td_err_e (*td_ta_new_p) (struct ps_prochandle *ps, td_thragent_t **ta); | |
80 | static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, | |
81 | td_thrhandle_t *__th); | |
82 | static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, | |
83 | td_thrhandle_t *th); | |
84 | static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
85 | td_thr_iter_f *callback, | |
86 | void *cbdata_p, td_thr_state_e state, | |
87 | int ti_pri, sigset_t *ti_sigmask_p, | |
88 | unsigned int ti_user_flags); | |
89 | static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
90 | td_event_e event, td_notify_t *ptr); | |
91 | static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
92 | td_thr_events_t *event); | |
93 | static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
94 | td_event_msg_t *msg); | |
95 | ||
96 | static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
97 | static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
98 | td_thrinfo_t *infop); | |
99 | static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th, | |
100 | gdb_prfpregset_t *regset); | |
101 | static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th, | |
102 | prgregset_t gregs); | |
103 | static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th, | |
104 | const gdb_prfpregset_t *fpregs); | |
105 | static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th, | |
106 | prgregset_t gregs); | |
107 | static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); | |
108 | ||
109 | /* Location of the thread creation event breakpoint. The code at this | |
110 | location in the child process will be called by the pthread library | |
111 | whenever a new thread is created. By setting a special breakpoint | |
112 | at this location, GDB can detect when a new thread is created. We | |
113 | obtain this location via the td_ta_event_addr call. */ | |
114 | static CORE_ADDR td_create_bp_addr; | |
115 | ||
116 | /* Location of the thread death event breakpoint. */ | |
117 | static CORE_ADDR td_death_bp_addr; | |
118 | ||
119 | /* Prototypes for local functions. */ | |
bda9cb72 | 120 | static void thread_db_find_new_threads (void); |
fb0e1ba7 MK |
121 | \f |
122 | ||
123 | /* Building process ids. */ | |
124 | ||
125 | #ifndef TIDGET | |
126 | #define TIDGET(PID) (((PID) & 0x7fffffff) >> 16) | |
127 | #define PIDGET(PID) (((PID) & 0xffff)) | |
128 | #define MERGEPID(PID, TID) (((PID) & 0xffff) | ((TID) << 16)) | |
129 | #endif | |
130 | ||
131 | #define THREAD_FLAG 0x80000000 | |
132 | ||
133 | #define is_lwp(pid) (((pid) & THREAD_FLAG) == 0 && TIDGET (pid)) | |
134 | #define is_thread(pid) ((pid) & THREAD_FLAG) | |
135 | ||
136 | #define GET_PID(pid) PIDGET (pid) | |
137 | #define GET_LWP(pid) TIDGET (pid) | |
138 | #define GET_THREAD(pid) TIDGET (pid) | |
139 | ||
140 | #define BUILD_LWP(tid, pid) MERGEPID (pid, tid) | |
141 | #define BUILD_THREAD(tid, pid) (MERGEPID (pid, tid) | THREAD_FLAG) | |
142 | \f | |
143 | ||
144 | struct private_thread_info | |
145 | { | |
146 | /* Cached LWP id. Must come first, see lin-lwp.c. */ | |
147 | lwpid_t lwpid; | |
148 | }; | |
149 | ||
150 | \f | |
151 | /* Helper functions. */ | |
152 | ||
153 | static void | |
154 | restore_inferior_pid (void *arg) | |
155 | { | |
156 | int *saved_pid_ptr = arg; | |
157 | inferior_pid = *saved_pid_ptr; | |
b8c9b27d | 158 | xfree (arg); |
fb0e1ba7 MK |
159 | } |
160 | ||
161 | static struct cleanup * | |
162 | save_inferior_pid (void) | |
163 | { | |
164 | int *saved_pid_ptr; | |
165 | ||
166 | saved_pid_ptr = xmalloc (sizeof (int)); | |
167 | *saved_pid_ptr = inferior_pid; | |
168 | return make_cleanup (restore_inferior_pid, saved_pid_ptr); | |
169 | } | |
170 | \f | |
171 | ||
172 | static char * | |
173 | thread_db_err_str (td_err_e err) | |
174 | { | |
175 | static char buf[64]; | |
176 | ||
177 | switch (err) | |
178 | { | |
179 | case TD_OK: | |
180 | return "generic 'call succeeded'"; | |
181 | case TD_ERR: | |
182 | return "generic error"; | |
183 | case TD_NOTHR: | |
184 | return "no thread to satisfy query"; | |
185 | case TD_NOSV: | |
186 | return "no sync handle to satisfy query"; | |
187 | case TD_NOLWP: | |
188 | return "no LWP to satisfy query"; | |
189 | case TD_BADPH: | |
190 | return "invalid process handle"; | |
191 | case TD_BADTH: | |
192 | return "invalid thread handle"; | |
193 | case TD_BADSH: | |
194 | return "invalid synchronization handle"; | |
195 | case TD_BADTA: | |
196 | return "invalid thread agent"; | |
197 | case TD_BADKEY: | |
198 | return "invalid key"; | |
199 | case TD_NOMSG: | |
200 | return "no event message for getmsg"; | |
201 | case TD_NOFPREGS: | |
202 | return "FPU register set not available"; | |
203 | case TD_NOLIBTHREAD: | |
204 | return "application not linked with libthread"; | |
205 | case TD_NOEVENT: | |
206 | return "requested event is not supported"; | |
207 | case TD_NOCAPAB: | |
208 | return "capability not available"; | |
209 | case TD_DBERR: | |
210 | return "debugger service failed"; | |
211 | case TD_NOAPLIC: | |
212 | return "operation not applicable to"; | |
213 | case TD_NOTSD: | |
214 | return "no thread-specific data for this thread"; | |
215 | case TD_MALLOC: | |
216 | return "malloc failed"; | |
217 | case TD_PARTIALREG: | |
218 | return "only part of register set was written/read"; | |
219 | case TD_NOXREGS: | |
220 | return "X register set not available for this thread"; | |
221 | default: | |
222 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
223 | return buf; | |
224 | } | |
225 | } | |
226 | ||
227 | static char * | |
228 | thread_db_state_str (td_thr_state_e state) | |
229 | { | |
230 | static char buf[64]; | |
231 | ||
232 | switch (state) | |
233 | { | |
234 | case TD_THR_STOPPED: | |
235 | return "stopped by debugger"; | |
236 | case TD_THR_RUN: | |
237 | return "runnable"; | |
238 | case TD_THR_ACTIVE: | |
239 | return "active"; | |
240 | case TD_THR_ZOMBIE: | |
241 | return "zombie"; | |
242 | case TD_THR_SLEEP: | |
243 | return "sleeping"; | |
244 | case TD_THR_STOPPED_ASLEEP: | |
245 | return "stopped by debugger AND blocked"; | |
246 | default: | |
247 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
248 | return buf; | |
249 | } | |
250 | } | |
251 | \f | |
252 | ||
253 | /* Convert between user-level thread ids and LWP ids. */ | |
254 | ||
255 | static int | |
256 | thread_from_lwp (int pid) | |
257 | { | |
258 | td_thrinfo_t ti; | |
259 | td_thrhandle_t th; | |
260 | td_err_e err; | |
261 | ||
262 | if (GET_LWP (pid) == 0) | |
263 | pid = BUILD_LWP (pid, pid); | |
264 | ||
265 | gdb_assert (is_lwp (pid)); | |
266 | ||
267 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (pid), &th); | |
268 | if (err != TD_OK) | |
269 | error ("Cannot find user-level thread for LWP %d: %s", | |
270 | GET_LWP (pid), thread_db_err_str (err)); | |
271 | ||
272 | err = td_thr_get_info_p (&th, &ti); | |
273 | if (err != TD_OK) | |
274 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
275 | ||
276 | return BUILD_THREAD (ti.ti_tid, GET_PID (pid)); | |
277 | } | |
278 | ||
279 | static int | |
280 | lwp_from_thread (int pid) | |
281 | { | |
282 | td_thrinfo_t ti; | |
283 | td_thrhandle_t th; | |
284 | td_err_e err; | |
285 | ||
286 | if (! is_thread (pid)) | |
287 | return pid; | |
288 | ||
289 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th); | |
290 | if (err != TD_OK) | |
291 | error ("Cannot find thread %ld: %s", | |
292 | (long) GET_THREAD (pid), thread_db_err_str (err)); | |
293 | ||
294 | err = td_thr_get_info_p (&th, &ti); | |
295 | if (err != TD_OK) | |
296 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
297 | ||
298 | return BUILD_LWP (ti.ti_lid, GET_PID (pid)); | |
299 | } | |
300 | \f | |
301 | ||
302 | void | |
303 | thread_db_init (struct target_ops *target) | |
304 | { | |
305 | target_beneath = target; | |
306 | } | |
307 | ||
308 | static int | |
309 | thread_db_load (void) | |
310 | { | |
311 | void *handle; | |
312 | td_err_e err; | |
313 | ||
314 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); | |
315 | if (handle == NULL) | |
316 | return 0; | |
317 | ||
318 | /* Initialize pointers to the dynamic library functions we will use. | |
319 | Essential functions first. */ | |
320 | ||
321 | td_init_p = dlsym (handle, "td_init"); | |
322 | if (td_init_p == NULL) | |
323 | return 0; | |
324 | ||
325 | td_ta_new_p = dlsym (handle, "td_ta_new"); | |
326 | if (td_ta_new_p == NULL) | |
327 | return 0; | |
328 | ||
329 | td_ta_map_id2thr_p = dlsym (handle, "td_ta_map_id2thr"); | |
330 | if (td_ta_map_id2thr_p == NULL) | |
331 | return 0; | |
332 | ||
333 | td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr"); | |
334 | if (td_ta_map_lwp2thr_p == NULL) | |
335 | return 0; | |
336 | ||
337 | td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter"); | |
338 | if (td_ta_thr_iter_p == NULL) | |
339 | return 0; | |
340 | ||
341 | td_thr_validate_p = dlsym (handle, "td_thr_validate"); | |
342 | if (td_thr_validate_p == NULL) | |
343 | return 0; | |
344 | ||
345 | td_thr_get_info_p = dlsym (handle, "td_thr_get_info"); | |
346 | if (td_thr_get_info_p == NULL) | |
347 | return 0; | |
348 | ||
349 | td_thr_getfpregs_p = dlsym (handle, "td_thr_getfpregs"); | |
350 | if (td_thr_getfpregs_p == NULL) | |
351 | return 0; | |
352 | ||
353 | td_thr_getgregs_p = dlsym (handle, "td_thr_getgregs"); | |
354 | if (td_thr_getgregs_p == NULL) | |
355 | return 0; | |
356 | ||
357 | td_thr_setfpregs_p = dlsym (handle, "td_thr_setfpregs"); | |
358 | if (td_thr_setfpregs_p == NULL) | |
359 | return 0; | |
360 | ||
361 | td_thr_setgregs_p = dlsym (handle, "td_thr_setgregs"); | |
362 | if (td_thr_setgregs_p == NULL) | |
363 | return 0; | |
364 | ||
365 | /* Initialize the library. */ | |
366 | err = td_init_p (); | |
367 | if (err != TD_OK) | |
368 | { | |
369 | warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err)); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | /* These are not essential. */ | |
374 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); | |
375 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); | |
376 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); | |
377 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); | |
378 | ||
379 | return 1; | |
380 | } | |
381 | ||
382 | static void | |
383 | enable_thread_event_reporting (void) | |
384 | { | |
385 | td_thr_events_t events; | |
386 | td_notify_t notify; | |
387 | td_err_e err; | |
388 | ||
389 | /* We cannot use the thread event reporting facility if these | |
390 | functions aren't available. */ | |
391 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL | |
392 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) | |
393 | return; | |
394 | ||
395 | /* Set the process wide mask saying which events we're interested in. */ | |
396 | td_event_emptyset (&events); | |
397 | td_event_addset (&events, TD_CREATE); | |
398 | #if 0 | |
399 | /* FIXME: kettenis/2000-04-23: The event reporting facility is | |
400 | broken for TD_DEATH events in glibc 2.1.3, so don't enable it for | |
401 | now. */ | |
402 | td_event_addset (&events, TD_DEATH); | |
403 | #endif | |
404 | ||
405 | err = td_ta_set_event_p (thread_agent, &events); | |
406 | if (err != TD_OK) | |
407 | { | |
408 | warning ("Unable to set global thread event mask: %s", | |
409 | thread_db_err_str (err)); | |
410 | return; | |
411 | } | |
412 | ||
413 | /* Delete previous thread event breakpoints, if any. */ | |
414 | remove_thread_event_breakpoints (); | |
415 | ||
416 | /* Get address for thread creation breakpoint. */ | |
417 | err = td_ta_event_addr_p (thread_agent, TD_CREATE, ¬ify); | |
418 | if (err != TD_OK) | |
419 | { | |
420 | warning ("Unable to get location for thread creation breakpoint: %s", | |
421 | thread_db_err_str (err)); | |
422 | return; | |
423 | } | |
424 | ||
425 | /* Set up the breakpoint. */ | |
426 | td_create_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
427 | create_thread_event_breakpoint (td_create_bp_addr); | |
428 | ||
429 | /* Get address for thread death breakpoint. */ | |
430 | err = td_ta_event_addr_p (thread_agent, TD_DEATH, ¬ify); | |
431 | if (err != TD_OK) | |
432 | { | |
433 | warning ("Unable to get location for thread creation breakpoint: %s", | |
434 | thread_db_err_str (err)); | |
435 | return; | |
436 | } | |
437 | ||
438 | /* Set up the breakpoint. */ | |
439 | td_death_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
440 | create_thread_event_breakpoint (td_death_bp_addr); | |
441 | } | |
442 | ||
443 | static void | |
444 | disable_thread_event_reporting (void) | |
445 | { | |
446 | td_thr_events_t events; | |
447 | ||
448 | /* Set the process wide mask saying we aren't interested in any | |
449 | events anymore. */ | |
450 | td_event_emptyset (&events); | |
451 | td_ta_set_event_p (thread_agent, &events); | |
452 | ||
453 | /* Delete thread event breakpoints, if any. */ | |
454 | remove_thread_event_breakpoints (); | |
455 | td_create_bp_addr = 0; | |
456 | td_death_bp_addr = 0; | |
457 | } | |
458 | ||
459 | static void | |
460 | check_thread_signals (void) | |
461 | { | |
462 | #ifdef GET_THREAD_SIGNALS | |
463 | if (! thread_signals) | |
464 | { | |
465 | sigset_t mask; | |
466 | int i; | |
467 | ||
468 | GET_THREAD_SIGNALS (&mask); | |
469 | sigemptyset (&thread_stop_set); | |
470 | sigemptyset (&thread_print_set); | |
471 | ||
472 | for (i = 0; i < NSIG; i++) | |
473 | { | |
474 | if (sigismember (&mask, i)) | |
475 | { | |
476 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
477 | sigaddset (&thread_stop_set, i); | |
478 | if (signal_print_update (target_signal_from_host (i), 0)) | |
479 | sigaddset (&thread_print_set, i); | |
480 | thread_signals = 1; | |
481 | } | |
482 | } | |
483 | } | |
484 | #endif | |
485 | } | |
486 | ||
487 | static void | |
488 | disable_thread_signals (void) | |
489 | { | |
490 | #ifdef GET_THREAD_SIGNALS | |
491 | if (thread_signals) | |
492 | { | |
493 | int i; | |
494 | ||
495 | for (i = 0; i < NSIG; i++) | |
496 | { | |
497 | if (sigismember (&thread_stop_set, i)) | |
498 | signal_stop_update (target_signal_from_host (i), 1); | |
499 | if (sigismember (&thread_print_set, i)) | |
500 | signal_print_update (target_signal_from_host (i), 1); | |
501 | } | |
502 | ||
503 | thread_signals = 0; | |
504 | } | |
505 | #endif | |
506 | } | |
507 | ||
508 | static void | |
bda9cb72 | 509 | deactivate_target (void) |
fb0e1ba7 | 510 | { |
bda9cb72 MK |
511 | /* Forget about the child's process ID. We shouldn't need it |
512 | anymore. */ | |
513 | proc_handle.pid = 0; | |
fb0e1ba7 | 514 | |
bda9cb72 MK |
515 | if (! keep_thread_db) |
516 | { | |
517 | using_thread_db = 0; | |
518 | unpush_target (&thread_db_ops); | |
519 | } | |
fb0e1ba7 MK |
520 | } |
521 | ||
522 | static void | |
523 | thread_db_new_objfile (struct objfile *objfile) | |
524 | { | |
525 | td_err_e err; | |
526 | ||
bda9cb72 MK |
527 | if (objfile == NULL) |
528 | { | |
529 | /* All symbols have been discarded. If the thread_db target is | |
530 | active, deactivate it now, even if the application was linked | |
531 | statically against the thread library. */ | |
532 | keep_thread_db = 0; | |
533 | if (using_thread_db) | |
534 | deactivate_target (); | |
535 | ||
536 | goto quit; | |
537 | } | |
538 | ||
fb0e1ba7 MK |
539 | if (using_thread_db) |
540 | /* Nothing to do. The thread library was already detected and the | |
541 | target vector was already activated. */ | |
542 | goto quit; | |
543 | ||
bda9cb72 MK |
544 | /* Initialize the structure that identifies the child process. Note |
545 | that at this point there is no guarantee that we actually have a | |
546 | child process. */ | |
fb0e1ba7 MK |
547 | proc_handle.pid = GET_PID (inferior_pid); |
548 | ||
bda9cb72 | 549 | /* Now attempt to open a connection to the thread library. */ |
fb0e1ba7 MK |
550 | err = td_ta_new_p (&proc_handle, &thread_agent); |
551 | switch (err) | |
552 | { | |
553 | case TD_NOLIBTHREAD: | |
bda9cb72 | 554 | /* No thread library was detected. */ |
fb0e1ba7 MK |
555 | break; |
556 | ||
557 | case TD_OK: | |
bda9cb72 MK |
558 | /* The thread library was detected. Activate the thread_db target. */ |
559 | push_target (&thread_db_ops); | |
560 | using_thread_db = 1; | |
561 | ||
562 | /* If the thread library was detected in the main symbol file | |
563 | itself, we assume that the program was statically linked | |
564 | against the thread library and well have to keep this | |
565 | module's target vector activated until forever... Well, at | |
566 | least until all symbols have been discarded anyway (see | |
567 | above). */ | |
568 | if (objfile == symfile_objfile) | |
569 | { | |
570 | gdb_assert (proc_handle.pid == 0); | |
571 | keep_thread_db = 1; | |
572 | } | |
573 | ||
574 | /* We can only poke around if there actually is a child process. | |
575 | If there is no child process alive, postpone the steps below | |
576 | until one has been created. */ | |
577 | if (proc_handle.pid != 0) | |
578 | { | |
579 | enable_thread_event_reporting (); | |
580 | thread_db_find_new_threads (); | |
581 | } | |
fb0e1ba7 MK |
582 | break; |
583 | ||
584 | default: | |
585 | warning ("Cannot initialize thread debugging library: %s", | |
586 | thread_db_err_str (err)); | |
587 | break; | |
588 | } | |
589 | ||
590 | quit: | |
591 | if (target_new_objfile_chain) | |
592 | target_new_objfile_chain (objfile); | |
593 | } | |
594 | ||
595 | static void | |
596 | attach_thread (int pid, const td_thrhandle_t *th_p, | |
597 | const td_thrinfo_t *ti_p, int verbose) | |
598 | { | |
599 | struct thread_info *tp; | |
600 | td_err_e err; | |
601 | ||
602 | check_thread_signals (); | |
603 | ||
604 | if (verbose) | |
605 | printf_unfiltered ("[New %s]\n", target_pid_to_str (pid)); | |
606 | ||
607 | /* Add the thread to GDB's thread list. */ | |
608 | tp = add_thread (pid); | |
609 | tp->private = xmalloc (sizeof (struct private_thread_info)); | |
610 | tp->private->lwpid = ti_p->ti_lid; | |
611 | ||
612 | /* Under Linux, we have to attach to each and every thread. */ | |
613 | #ifdef ATTACH_LWP | |
614 | if (ti_p->ti_lid != GET_PID (pid)) | |
615 | ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (pid)), 0); | |
616 | #endif | |
617 | ||
618 | /* Enable thread event reporting for this thread. */ | |
619 | err = td_thr_event_enable_p (th_p, 1); | |
620 | if (err != TD_OK) | |
621 | error ("Cannot enable thread event reporting for %s: %s", | |
622 | target_pid_to_str (pid), thread_db_err_str (err)); | |
623 | } | |
624 | ||
625 | static void | |
626 | detach_thread (int pid, int verbose) | |
627 | { | |
628 | if (verbose) | |
629 | printf_unfiltered ("[%s exited]\n", target_pid_to_str (pid)); | |
630 | } | |
631 | ||
632 | static void | |
633 | thread_db_detach (char *args, int from_tty) | |
634 | { | |
635 | disable_thread_event_reporting (); | |
bda9cb72 | 636 | deactivate_target (); |
fb0e1ba7 MK |
637 | |
638 | target_beneath->to_detach (args, from_tty); | |
639 | } | |
640 | ||
641 | static void | |
642 | thread_db_resume (int pid, int step, enum target_signal signo) | |
643 | { | |
644 | struct cleanup *old_chain = save_inferior_pid (); | |
645 | ||
646 | if (pid == -1) | |
647 | inferior_pid = lwp_from_thread (inferior_pid); | |
648 | else if (is_thread (pid)) | |
649 | pid = lwp_from_thread (pid); | |
650 | ||
651 | target_beneath->to_resume (pid, step, signo); | |
652 | ||
653 | do_cleanups (old_chain); | |
654 | } | |
655 | ||
656 | /* Check if PID is currently stopped at the location of a thread event | |
657 | breakpoint location. If it is, read the event message and act upon | |
658 | the event. */ | |
659 | ||
660 | static void | |
661 | check_event (int pid) | |
662 | { | |
663 | td_event_msg_t msg; | |
664 | td_thrinfo_t ti; | |
665 | td_err_e err; | |
666 | CORE_ADDR stop_pc; | |
667 | ||
668 | /* Bail out early if we're not at a thread event breakpoint. */ | |
669 | stop_pc = read_pc_pid (pid) - DECR_PC_AFTER_BREAK; | |
670 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) | |
671 | return; | |
672 | ||
673 | err = td_ta_event_getmsg_p (thread_agent, &msg); | |
674 | if (err != TD_OK) | |
675 | { | |
676 | if (err == TD_NOMSG) | |
677 | return; | |
678 | ||
679 | error ("Cannot get thread event message: %s", thread_db_err_str (err)); | |
680 | } | |
681 | ||
682 | err = td_thr_get_info_p (msg.th_p, &ti); | |
683 | if (err != TD_OK) | |
684 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
685 | ||
686 | pid = BUILD_THREAD (ti.ti_tid, GET_PID (pid)); | |
687 | ||
688 | switch (msg.event) | |
689 | { | |
690 | case TD_CREATE: | |
691 | #if 0 | |
692 | /* FIXME: kettenis/2000-08-26: Since we use td_ta_event_getmsg, | |
693 | there is no guarantee that the breakpoint will match the | |
694 | event. Should we use td_thr_event_getmsg instead? */ | |
695 | ||
696 | if (stop_pc != td_create_bp_addr) | |
697 | error ("Thread creation event doesn't match breakpoint."); | |
698 | #endif | |
699 | ||
700 | if (in_thread_list (pid)) | |
701 | error ("Spurious thread creation event."); | |
702 | ||
703 | attach_thread (pid, msg.th_p, &ti, 1); | |
704 | return; | |
705 | ||
706 | case TD_DEATH: | |
707 | #if 0 | |
708 | /* FIXME: See TD_CREATE. */ | |
709 | ||
710 | if (stop_pc != td_death_bp_addr) | |
711 | error ("Thread death event doesn't match breakpoint."); | |
712 | #endif | |
713 | ||
714 | if (! in_thread_list (pid)) | |
715 | error ("Spurious thread death event."); | |
716 | ||
717 | detach_thread (pid, 1); | |
718 | return; | |
719 | ||
720 | default: | |
721 | error ("Spurious thread event."); | |
722 | } | |
723 | } | |
724 | ||
725 | static int | |
726 | thread_db_wait (int pid, struct target_waitstatus *ourstatus) | |
727 | { | |
728 | extern int trap_pid; | |
729 | ||
730 | if (pid != -1 && is_thread (pid)) | |
731 | pid = lwp_from_thread (pid); | |
732 | ||
733 | pid = target_beneath->to_wait (pid, ourstatus); | |
734 | ||
bda9cb72 MK |
735 | if (proc_handle.pid == 0) |
736 | /* The current child process isn't the actual multi-threaded | |
737 | program yet, so don't try to do any special thread-specific | |
738 | post-processing and bail out early. */ | |
739 | return pid; | |
740 | ||
fb0e1ba7 MK |
741 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
742 | return -1; | |
743 | ||
744 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED | |
745 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
746 | /* Check for a thread event. */ | |
747 | check_event (pid); | |
748 | ||
749 | if (trap_pid) | |
750 | trap_pid = thread_from_lwp (trap_pid); | |
751 | ||
752 | return thread_from_lwp (pid); | |
753 | } | |
754 | ||
755 | static int | |
756 | thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
e5da8f38 | 757 | struct mem_attrib *attrib, |
fb0e1ba7 MK |
758 | struct target_ops *target) |
759 | { | |
760 | struct cleanup *old_chain = save_inferior_pid (); | |
761 | int xfer; | |
762 | ||
763 | if (is_thread (inferior_pid)) | |
764 | { | |
765 | /* FIXME: This seems to be necessary to make sure breakpoints | |
766 | are removed. */ | |
767 | if (! target_thread_alive (inferior_pid)) | |
768 | inferior_pid = GET_PID (inferior_pid); | |
769 | else | |
770 | inferior_pid = lwp_from_thread (inferior_pid); | |
771 | } | |
772 | ||
e5da8f38 | 773 | xfer = target_beneath->to_xfer_memory (memaddr, myaddr, len, write, attrib, target); |
fb0e1ba7 MK |
774 | |
775 | do_cleanups (old_chain); | |
776 | return xfer; | |
777 | } | |
778 | ||
779 | static void | |
780 | thread_db_fetch_registers (int regno) | |
781 | { | |
782 | td_thrhandle_t th; | |
783 | prgregset_t gregset; | |
784 | gdb_prfpregset_t fpregset; | |
785 | td_err_e err; | |
786 | ||
787 | if (! is_thread (inferior_pid)) | |
788 | { | |
789 | /* Pass the request to the target beneath us. */ | |
790 | target_beneath->to_fetch_registers (regno); | |
791 | return; | |
792 | } | |
793 | ||
794 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_pid), &th); | |
795 | if (err != TD_OK) | |
796 | error ("Cannot find thread %ld: %s", | |
797 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
798 | ||
799 | err = td_thr_getgregs_p (&th, gregset); | |
800 | if (err != TD_OK) | |
801 | error ("Cannot fetch general-purpose registers for thread %ld: %s", | |
802 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
803 | ||
804 | err = td_thr_getfpregs_p (&th, &fpregset); | |
805 | if (err != TD_OK) | |
806 | error ("Cannot get floating-point registers for thread %ld: %s", | |
807 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
808 | ||
809 | /* Note that we must call supply_gregset after calling the thread_db | |
810 | routines because the thread_db routines call ps_lgetgregs and | |
811 | friends which clobber GDB's register cache. */ | |
812 | supply_gregset ((gdb_gregset_t *) gregset); | |
813 | supply_fpregset (&fpregset); | |
814 | } | |
815 | ||
816 | static void | |
817 | thread_db_store_registers (int regno) | |
818 | { | |
819 | td_thrhandle_t th; | |
820 | prgregset_t gregset; | |
821 | gdb_prfpregset_t fpregset; | |
822 | td_err_e err; | |
823 | ||
824 | if (! is_thread (inferior_pid)) | |
825 | { | |
826 | /* Pass the request to the target beneath us. */ | |
827 | target_beneath->to_store_registers (regno); | |
828 | return; | |
829 | } | |
830 | ||
831 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_pid), &th); | |
832 | if (err != TD_OK) | |
833 | error ("Cannot find thread %ld: %s", | |
834 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
835 | ||
836 | if (regno != -1) | |
837 | { | |
838 | char raw[MAX_REGISTER_RAW_SIZE]; | |
839 | ||
840 | read_register_gen (regno, raw); | |
841 | thread_db_fetch_registers (-1); | |
842 | supply_register (regno, raw); | |
843 | } | |
844 | ||
845 | fill_gregset ((gdb_gregset_t *) gregset, -1); | |
846 | fill_fpregset (&fpregset, -1); | |
847 | ||
848 | err = td_thr_setgregs_p (&th, gregset); | |
849 | if (err != TD_OK) | |
850 | error ("Cannot store general-purpose registers for thread %ld: %s", | |
851 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
852 | err = td_thr_setfpregs_p (&th, &fpregset); | |
853 | if (err != TD_OK) | |
854 | error ("Cannot store floating-point registers for thread %ld: %s", | |
855 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
856 | } | |
857 | ||
858 | static void | |
859 | thread_db_kill (void) | |
860 | { | |
861 | target_beneath->to_kill (); | |
862 | } | |
863 | ||
864 | static void | |
865 | thread_db_create_inferior (char *exec_file, char *allargs, char **env) | |
866 | { | |
bda9cb72 MK |
867 | target_beneath->to_create_inferior (exec_file, allargs, env); |
868 | } | |
fb0e1ba7 | 869 | |
bda9cb72 MK |
870 | static void |
871 | thread_db_post_startup_inferior (int pid) | |
872 | { | |
873 | if (proc_handle.pid == 0) | |
874 | { | |
875 | /* The child process is now the actual multi-threaded | |
876 | program. Snatch its process ID... */ | |
877 | proc_handle.pid = GET_PID (pid); | |
fb0e1ba7 | 878 | |
bda9cb72 MK |
879 | /* ...and perform the remaining initialization steps. */ |
880 | enable_thread_event_reporting (); | |
881 | thread_db_find_new_threads(); | |
882 | } | |
fb0e1ba7 MK |
883 | } |
884 | ||
885 | static void | |
886 | thread_db_mourn_inferior (void) | |
887 | { | |
888 | remove_thread_event_breakpoints (); | |
bda9cb72 | 889 | deactivate_target (); |
fb0e1ba7 MK |
890 | |
891 | target_beneath->to_mourn_inferior (); | |
892 | } | |
893 | ||
894 | static int | |
895 | thread_db_thread_alive (int pid) | |
896 | { | |
897 | if (is_thread (pid)) | |
898 | { | |
899 | td_thrhandle_t th; | |
900 | td_err_e err; | |
901 | ||
902 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th); | |
903 | if (err != TD_OK) | |
904 | return 0; | |
905 | ||
906 | err = td_thr_validate_p (&th); | |
907 | if (err != TD_OK) | |
908 | return 0; | |
909 | ||
910 | return 1; | |
911 | } | |
912 | ||
913 | if (target_beneath->to_thread_alive) | |
914 | return target_beneath->to_thread_alive (pid); | |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
919 | static int | |
920 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
921 | { | |
922 | td_thrinfo_t ti; | |
923 | td_err_e err; | |
924 | int pid; | |
925 | ||
926 | err = td_thr_get_info_p (th_p, &ti); | |
927 | if (err != TD_OK) | |
928 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
929 | ||
930 | pid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_pid)); | |
931 | ||
932 | if (! in_thread_list (pid)) | |
933 | attach_thread (pid, th_p, &ti, 1); | |
934 | ||
935 | return 0; | |
936 | } | |
937 | ||
938 | static void | |
939 | thread_db_find_new_threads (void) | |
940 | { | |
941 | td_err_e err; | |
942 | ||
943 | /* Iterate over all user-space threads to discover new threads. */ | |
944 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, | |
945 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
946 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
947 | if (err != TD_OK) | |
948 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
949 | } | |
950 | ||
951 | static char * | |
952 | thread_db_pid_to_str (int pid) | |
953 | { | |
954 | if (is_thread (pid)) | |
955 | { | |
956 | static char buf[64]; | |
957 | td_thrhandle_t th; | |
958 | td_thrinfo_t ti; | |
959 | td_err_e err; | |
960 | ||
961 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th); | |
962 | if (err != TD_OK) | |
963 | error ("Cannot find thread %ld: %s", | |
964 | (long) GET_THREAD (pid), thread_db_err_str (err)); | |
965 | ||
966 | err = td_thr_get_info_p (&th, &ti); | |
967 | if (err != TD_OK) | |
968 | error ("Cannot get thread info for thread %ld: %s", | |
969 | (long) GET_THREAD (pid), thread_db_err_str (err)); | |
970 | ||
971 | if (ti.ti_state == TD_THR_ACTIVE && ti.ti_lid != 0) | |
972 | { | |
973 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", | |
974 | (long) ti.ti_tid, ti.ti_lid); | |
975 | } | |
976 | else | |
977 | { | |
978 | snprintf (buf, sizeof (buf), "Thread %ld (%s)", | |
979 | (long) ti.ti_tid, thread_db_state_str (ti.ti_state)); | |
980 | } | |
981 | ||
982 | return buf; | |
983 | } | |
984 | ||
985 | if (target_beneath->to_pid_to_str (pid)) | |
986 | return target_beneath->to_pid_to_str (pid); | |
987 | ||
988 | return normal_pid_to_str (pid); | |
989 | } | |
990 | ||
991 | static void | |
992 | init_thread_db_ops (void) | |
993 | { | |
994 | thread_db_ops.to_shortname = "multi-thread"; | |
995 | thread_db_ops.to_longname = "multi-threaded child process."; | |
996 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
997 | thread_db_ops.to_detach = thread_db_detach; | |
998 | thread_db_ops.to_resume = thread_db_resume; | |
999 | thread_db_ops.to_wait = thread_db_wait; | |
1000 | thread_db_ops.to_fetch_registers = thread_db_fetch_registers; | |
1001 | thread_db_ops.to_store_registers = thread_db_store_registers; | |
1002 | thread_db_ops.to_xfer_memory = thread_db_xfer_memory; | |
1003 | thread_db_ops.to_kill = thread_db_kill; | |
1004 | thread_db_ops.to_create_inferior = thread_db_create_inferior; | |
bda9cb72 | 1005 | thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior; |
fb0e1ba7 MK |
1006 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
1007 | thread_db_ops.to_thread_alive = thread_db_thread_alive; | |
1008 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; | |
1009 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1010 | thread_db_ops.to_stratum = thread_stratum; | |
1011 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
1012 | thread_db_ops.to_magic = OPS_MAGIC; | |
1013 | } | |
1014 | ||
1015 | void | |
1016 | _initialize_thread_db (void) | |
1017 | { | |
1018 | /* Only initialize the module if we can load libthread_db. */ | |
1019 | if (thread_db_load ()) | |
1020 | { | |
1021 | init_thread_db_ops (); | |
1022 | add_target (&thread_db_ops); | |
1023 | ||
1024 | /* Add ourselves to objfile event chain. */ | |
1025 | target_new_objfile_chain = target_new_objfile_hook; | |
1026 | target_new_objfile_hook = thread_db_new_objfile; | |
1027 | } | |
1028 | } |