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