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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" |
20b8570d MS |
34 | #include "command.h" |
35 | #include "gdbcmd.h" | |
4e052eda | 36 | #include "regcache.h" |
fb0e1ba7 MK |
37 | |
38 | #ifndef LIBTHREAD_DB_SO | |
39 | #define LIBTHREAD_DB_SO "libthread_db.so.1" | |
40 | #endif | |
41 | ||
20b8570d MS |
42 | int debug_linux_threads = 0; /* Set non-zero for debugging output. */ |
43 | ||
fb0e1ba7 MK |
44 | /* If we're running on Linux, we must explicitly attach to any new threads. */ |
45 | ||
46 | /* FIXME: There is certainly some room for improvements: | |
47 | - Cache LWP ids. | |
48 | - Bypass libthread_db when fetching or storing registers for | |
49 | threads bound to a LWP. */ | |
50 | ||
51 | /* This module's target vector. */ | |
52 | static struct target_ops thread_db_ops; | |
53 | ||
54 | /* The target vector that we call for things this module can't handle. */ | |
55 | static struct target_ops *target_beneath; | |
56 | ||
57 | /* Pointer to the next function on the objfile event chain. */ | |
20b8570d | 58 | static void (*new_objfile_event_chain) (struct objfile *objfile); |
fb0e1ba7 MK |
59 | |
60 | /* Non-zero if we're using this module's target vector. */ | |
61 | static int using_thread_db; | |
62 | ||
bda9cb72 MK |
63 | /* Non-zero if we musn't deactivate this module's target vector. */ |
64 | static int keep_thread_db; | |
65 | ||
fb0e1ba7 MK |
66 | /* Non-zero if we have determined the signals used by the threads |
67 | library. */ | |
68 | static int thread_signals; | |
69 | static sigset_t thread_stop_set; | |
70 | static sigset_t thread_print_set; | |
71 | ||
72 | /* Structure that identifies the child process for the | |
73 | <proc_service.h> interface. */ | |
74 | static struct ps_prochandle proc_handle; | |
75 | ||
76 | /* Connection to the libthread_db library. */ | |
77 | static td_thragent_t *thread_agent; | |
78 | ||
79 | /* Pointers to the libthread_db functions. */ | |
80 | ||
81 | static td_err_e (*td_init_p) (void); | |
82 | ||
83 | static td_err_e (*td_ta_new_p) (struct ps_prochandle *ps, td_thragent_t **ta); | |
84 | static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, | |
85 | td_thrhandle_t *__th); | |
86 | static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, | |
87 | td_thrhandle_t *th); | |
88 | static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
89 | td_thr_iter_f *callback, | |
90 | void *cbdata_p, td_thr_state_e state, | |
91 | int ti_pri, sigset_t *ti_sigmask_p, | |
92 | unsigned int ti_user_flags); | |
93 | static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
94 | td_event_e event, td_notify_t *ptr); | |
95 | static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
96 | td_thr_events_t *event); | |
97 | static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
98 | td_event_msg_t *msg); | |
99 | ||
100 | static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
101 | static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
102 | td_thrinfo_t *infop); | |
103 | static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th, | |
104 | gdb_prfpregset_t *regset); | |
105 | static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th, | |
106 | prgregset_t gregs); | |
107 | static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th, | |
108 | const gdb_prfpregset_t *fpregs); | |
109 | static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th, | |
110 | prgregset_t gregs); | |
111 | static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); | |
112 | ||
113 | /* Location of the thread creation event breakpoint. The code at this | |
114 | location in the child process will be called by the pthread library | |
115 | whenever a new thread is created. By setting a special breakpoint | |
116 | at this location, GDB can detect when a new thread is created. We | |
117 | obtain this location via the td_ta_event_addr call. */ | |
118 | static CORE_ADDR td_create_bp_addr; | |
119 | ||
120 | /* Location of the thread death event breakpoint. */ | |
121 | static CORE_ADDR td_death_bp_addr; | |
122 | ||
123 | /* Prototypes for local functions. */ | |
bda9cb72 | 124 | static void thread_db_find_new_threads (void); |
fb0e1ba7 MK |
125 | \f |
126 | ||
127 | /* Building process ids. */ | |
128 | ||
129 | #ifndef TIDGET | |
130 | #define TIDGET(PID) (((PID) & 0x7fffffff) >> 16) | |
131 | #define PIDGET(PID) (((PID) & 0xffff)) | |
132 | #define MERGEPID(PID, TID) (((PID) & 0xffff) | ((TID) << 16)) | |
133 | #endif | |
134 | ||
135 | #define THREAD_FLAG 0x80000000 | |
136 | ||
137 | #define is_lwp(pid) (((pid) & THREAD_FLAG) == 0 && TIDGET (pid)) | |
138 | #define is_thread(pid) ((pid) & THREAD_FLAG) | |
139 | ||
140 | #define GET_PID(pid) PIDGET (pid) | |
141 | #define GET_LWP(pid) TIDGET (pid) | |
142 | #define GET_THREAD(pid) TIDGET (pid) | |
143 | ||
144 | #define BUILD_LWP(tid, pid) MERGEPID (pid, tid) | |
145 | #define BUILD_THREAD(tid, pid) (MERGEPID (pid, tid) | THREAD_FLAG) | |
146 | \f | |
147 | ||
148 | struct private_thread_info | |
149 | { | |
150 | /* Cached LWP id. Must come first, see lin-lwp.c. */ | |
151 | lwpid_t lwpid; | |
152 | }; | |
153 | ||
154 | \f | |
155 | /* Helper functions. */ | |
156 | ||
157 | static void | |
158 | restore_inferior_pid (void *arg) | |
159 | { | |
160 | int *saved_pid_ptr = arg; | |
161 | inferior_pid = *saved_pid_ptr; | |
b8c9b27d | 162 | xfree (arg); |
fb0e1ba7 MK |
163 | } |
164 | ||
165 | static struct cleanup * | |
166 | save_inferior_pid (void) | |
167 | { | |
168 | int *saved_pid_ptr; | |
169 | ||
170 | saved_pid_ptr = xmalloc (sizeof (int)); | |
171 | *saved_pid_ptr = inferior_pid; | |
172 | return make_cleanup (restore_inferior_pid, saved_pid_ptr); | |
173 | } | |
174 | \f | |
175 | ||
176 | static char * | |
177 | thread_db_err_str (td_err_e err) | |
178 | { | |
179 | static char buf[64]; | |
180 | ||
181 | switch (err) | |
182 | { | |
183 | case TD_OK: | |
184 | return "generic 'call succeeded'"; | |
185 | case TD_ERR: | |
186 | return "generic error"; | |
187 | case TD_NOTHR: | |
188 | return "no thread to satisfy query"; | |
189 | case TD_NOSV: | |
190 | return "no sync handle to satisfy query"; | |
191 | case TD_NOLWP: | |
192 | return "no LWP to satisfy query"; | |
193 | case TD_BADPH: | |
194 | return "invalid process handle"; | |
195 | case TD_BADTH: | |
196 | return "invalid thread handle"; | |
197 | case TD_BADSH: | |
198 | return "invalid synchronization handle"; | |
199 | case TD_BADTA: | |
200 | return "invalid thread agent"; | |
201 | case TD_BADKEY: | |
202 | return "invalid key"; | |
203 | case TD_NOMSG: | |
204 | return "no event message for getmsg"; | |
205 | case TD_NOFPREGS: | |
206 | return "FPU register set not available"; | |
207 | case TD_NOLIBTHREAD: | |
208 | return "application not linked with libthread"; | |
209 | case TD_NOEVENT: | |
210 | return "requested event is not supported"; | |
211 | case TD_NOCAPAB: | |
212 | return "capability not available"; | |
213 | case TD_DBERR: | |
214 | return "debugger service failed"; | |
215 | case TD_NOAPLIC: | |
216 | return "operation not applicable to"; | |
217 | case TD_NOTSD: | |
218 | return "no thread-specific data for this thread"; | |
219 | case TD_MALLOC: | |
220 | return "malloc failed"; | |
221 | case TD_PARTIALREG: | |
222 | return "only part of register set was written/read"; | |
223 | case TD_NOXREGS: | |
224 | return "X register set not available for this thread"; | |
225 | default: | |
226 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
227 | return buf; | |
228 | } | |
229 | } | |
230 | ||
231 | static char * | |
232 | thread_db_state_str (td_thr_state_e state) | |
233 | { | |
234 | static char buf[64]; | |
235 | ||
236 | switch (state) | |
237 | { | |
238 | case TD_THR_STOPPED: | |
239 | return "stopped by debugger"; | |
240 | case TD_THR_RUN: | |
241 | return "runnable"; | |
242 | case TD_THR_ACTIVE: | |
243 | return "active"; | |
244 | case TD_THR_ZOMBIE: | |
245 | return "zombie"; | |
246 | case TD_THR_SLEEP: | |
247 | return "sleeping"; | |
248 | case TD_THR_STOPPED_ASLEEP: | |
249 | return "stopped by debugger AND blocked"; | |
250 | default: | |
251 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
252 | return buf; | |
253 | } | |
254 | } | |
255 | \f | |
256 | ||
257 | /* Convert between user-level thread ids and LWP ids. */ | |
258 | ||
259 | static int | |
260 | thread_from_lwp (int pid) | |
261 | { | |
262 | td_thrinfo_t ti; | |
263 | td_thrhandle_t th; | |
264 | td_err_e err; | |
265 | ||
266 | if (GET_LWP (pid) == 0) | |
267 | pid = BUILD_LWP (pid, pid); | |
268 | ||
269 | gdb_assert (is_lwp (pid)); | |
270 | ||
271 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (pid), &th); | |
272 | if (err != TD_OK) | |
273 | error ("Cannot find user-level thread for LWP %d: %s", | |
274 | GET_LWP (pid), thread_db_err_str (err)); | |
275 | ||
276 | err = td_thr_get_info_p (&th, &ti); | |
277 | if (err != TD_OK) | |
278 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
279 | ||
280 | return BUILD_THREAD (ti.ti_tid, GET_PID (pid)); | |
281 | } | |
282 | ||
283 | static int | |
284 | lwp_from_thread (int pid) | |
285 | { | |
286 | td_thrinfo_t ti; | |
287 | td_thrhandle_t th; | |
288 | td_err_e err; | |
289 | ||
290 | if (! is_thread (pid)) | |
291 | return pid; | |
292 | ||
293 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th); | |
294 | if (err != TD_OK) | |
295 | error ("Cannot find thread %ld: %s", | |
296 | (long) GET_THREAD (pid), thread_db_err_str (err)); | |
297 | ||
298 | err = td_thr_get_info_p (&th, &ti); | |
299 | if (err != TD_OK) | |
300 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
301 | ||
302 | return BUILD_LWP (ti.ti_lid, GET_PID (pid)); | |
303 | } | |
304 | \f | |
305 | ||
306 | void | |
307 | thread_db_init (struct target_ops *target) | |
308 | { | |
309 | target_beneath = target; | |
310 | } | |
311 | ||
312 | static int | |
313 | thread_db_load (void) | |
314 | { | |
315 | void *handle; | |
316 | td_err_e err; | |
317 | ||
318 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); | |
319 | if (handle == NULL) | |
320 | return 0; | |
321 | ||
322 | /* Initialize pointers to the dynamic library functions we will use. | |
323 | Essential functions first. */ | |
324 | ||
325 | td_init_p = dlsym (handle, "td_init"); | |
326 | if (td_init_p == NULL) | |
327 | return 0; | |
328 | ||
329 | td_ta_new_p = dlsym (handle, "td_ta_new"); | |
330 | if (td_ta_new_p == NULL) | |
331 | return 0; | |
332 | ||
333 | td_ta_map_id2thr_p = dlsym (handle, "td_ta_map_id2thr"); | |
334 | if (td_ta_map_id2thr_p == NULL) | |
335 | return 0; | |
336 | ||
337 | td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr"); | |
338 | if (td_ta_map_lwp2thr_p == NULL) | |
339 | return 0; | |
340 | ||
341 | td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter"); | |
342 | if (td_ta_thr_iter_p == NULL) | |
343 | return 0; | |
344 | ||
345 | td_thr_validate_p = dlsym (handle, "td_thr_validate"); | |
346 | if (td_thr_validate_p == NULL) | |
347 | return 0; | |
348 | ||
349 | td_thr_get_info_p = dlsym (handle, "td_thr_get_info"); | |
350 | if (td_thr_get_info_p == NULL) | |
351 | return 0; | |
352 | ||
353 | td_thr_getfpregs_p = dlsym (handle, "td_thr_getfpregs"); | |
354 | if (td_thr_getfpregs_p == NULL) | |
355 | return 0; | |
356 | ||
357 | td_thr_getgregs_p = dlsym (handle, "td_thr_getgregs"); | |
358 | if (td_thr_getgregs_p == NULL) | |
359 | return 0; | |
360 | ||
361 | td_thr_setfpregs_p = dlsym (handle, "td_thr_setfpregs"); | |
362 | if (td_thr_setfpregs_p == NULL) | |
363 | return 0; | |
364 | ||
365 | td_thr_setgregs_p = dlsym (handle, "td_thr_setgregs"); | |
366 | if (td_thr_setgregs_p == NULL) | |
367 | return 0; | |
368 | ||
369 | /* Initialize the library. */ | |
370 | err = td_init_p (); | |
371 | if (err != TD_OK) | |
372 | { | |
373 | warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err)); | |
374 | return 0; | |
375 | } | |
376 | ||
377 | /* These are not essential. */ | |
378 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); | |
379 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); | |
380 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); | |
381 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); | |
382 | ||
383 | return 1; | |
384 | } | |
385 | ||
386 | static void | |
387 | enable_thread_event_reporting (void) | |
388 | { | |
389 | td_thr_events_t events; | |
390 | td_notify_t notify; | |
391 | td_err_e err; | |
392 | ||
393 | /* We cannot use the thread event reporting facility if these | |
394 | functions aren't available. */ | |
395 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL | |
396 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) | |
397 | return; | |
398 | ||
399 | /* Set the process wide mask saying which events we're interested in. */ | |
400 | td_event_emptyset (&events); | |
401 | td_event_addset (&events, TD_CREATE); | |
402 | #if 0 | |
403 | /* FIXME: kettenis/2000-04-23: The event reporting facility is | |
404 | broken for TD_DEATH events in glibc 2.1.3, so don't enable it for | |
405 | now. */ | |
406 | td_event_addset (&events, TD_DEATH); | |
407 | #endif | |
408 | ||
409 | err = td_ta_set_event_p (thread_agent, &events); | |
410 | if (err != TD_OK) | |
411 | { | |
412 | warning ("Unable to set global thread event mask: %s", | |
413 | thread_db_err_str (err)); | |
414 | return; | |
415 | } | |
416 | ||
417 | /* Delete previous thread event breakpoints, if any. */ | |
418 | remove_thread_event_breakpoints (); | |
419 | ||
420 | /* Get address for thread creation breakpoint. */ | |
421 | err = td_ta_event_addr_p (thread_agent, TD_CREATE, ¬ify); | |
422 | if (err != TD_OK) | |
423 | { | |
424 | warning ("Unable to get location for thread creation breakpoint: %s", | |
425 | thread_db_err_str (err)); | |
426 | return; | |
427 | } | |
428 | ||
429 | /* Set up the breakpoint. */ | |
430 | td_create_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
431 | create_thread_event_breakpoint (td_create_bp_addr); | |
432 | ||
433 | /* Get address for thread death breakpoint. */ | |
434 | err = td_ta_event_addr_p (thread_agent, TD_DEATH, ¬ify); | |
435 | if (err != TD_OK) | |
436 | { | |
437 | warning ("Unable to get location for thread creation breakpoint: %s", | |
438 | thread_db_err_str (err)); | |
439 | return; | |
440 | } | |
441 | ||
442 | /* Set up the breakpoint. */ | |
443 | td_death_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
444 | create_thread_event_breakpoint (td_death_bp_addr); | |
445 | } | |
446 | ||
447 | static void | |
448 | disable_thread_event_reporting (void) | |
449 | { | |
450 | td_thr_events_t events; | |
451 | ||
452 | /* Set the process wide mask saying we aren't interested in any | |
453 | events anymore. */ | |
454 | td_event_emptyset (&events); | |
455 | td_ta_set_event_p (thread_agent, &events); | |
456 | ||
457 | /* Delete thread event breakpoints, if any. */ | |
458 | remove_thread_event_breakpoints (); | |
459 | td_create_bp_addr = 0; | |
460 | td_death_bp_addr = 0; | |
461 | } | |
462 | ||
463 | static void | |
464 | check_thread_signals (void) | |
465 | { | |
466 | #ifdef GET_THREAD_SIGNALS | |
467 | if (! thread_signals) | |
468 | { | |
469 | sigset_t mask; | |
470 | int i; | |
471 | ||
472 | GET_THREAD_SIGNALS (&mask); | |
473 | sigemptyset (&thread_stop_set); | |
474 | sigemptyset (&thread_print_set); | |
475 | ||
b9569773 | 476 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
477 | { |
478 | if (sigismember (&mask, i)) | |
479 | { | |
480 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
481 | sigaddset (&thread_stop_set, i); | |
482 | if (signal_print_update (target_signal_from_host (i), 0)) | |
483 | sigaddset (&thread_print_set, i); | |
484 | thread_signals = 1; | |
485 | } | |
486 | } | |
487 | } | |
488 | #endif | |
489 | } | |
490 | ||
491 | static void | |
492 | disable_thread_signals (void) | |
493 | { | |
494 | #ifdef GET_THREAD_SIGNALS | |
495 | if (thread_signals) | |
496 | { | |
497 | int i; | |
498 | ||
b9569773 | 499 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
500 | { |
501 | if (sigismember (&thread_stop_set, i)) | |
502 | signal_stop_update (target_signal_from_host (i), 1); | |
503 | if (sigismember (&thread_print_set, i)) | |
504 | signal_print_update (target_signal_from_host (i), 1); | |
505 | } | |
506 | ||
507 | thread_signals = 0; | |
508 | } | |
509 | #endif | |
510 | } | |
511 | ||
512 | static void | |
bda9cb72 | 513 | deactivate_target (void) |
fb0e1ba7 | 514 | { |
bda9cb72 MK |
515 | /* Forget about the child's process ID. We shouldn't need it |
516 | anymore. */ | |
517 | proc_handle.pid = 0; | |
fb0e1ba7 | 518 | |
bda9cb72 MK |
519 | if (! keep_thread_db) |
520 | { | |
521 | using_thread_db = 0; | |
522 | unpush_target (&thread_db_ops); | |
523 | } | |
fb0e1ba7 MK |
524 | } |
525 | ||
526 | static void | |
527 | thread_db_new_objfile (struct objfile *objfile) | |
528 | { | |
529 | td_err_e err; | |
530 | ||
bda9cb72 MK |
531 | if (objfile == NULL) |
532 | { | |
533 | /* All symbols have been discarded. If the thread_db target is | |
534 | active, deactivate it now, even if the application was linked | |
535 | statically against the thread library. */ | |
536 | keep_thread_db = 0; | |
537 | if (using_thread_db) | |
538 | deactivate_target (); | |
539 | ||
540 | goto quit; | |
541 | } | |
542 | ||
fb0e1ba7 MK |
543 | if (using_thread_db) |
544 | /* Nothing to do. The thread library was already detected and the | |
545 | target vector was already activated. */ | |
546 | goto quit; | |
547 | ||
bda9cb72 MK |
548 | /* Initialize the structure that identifies the child process. Note |
549 | that at this point there is no guarantee that we actually have a | |
550 | child process. */ | |
fb0e1ba7 MK |
551 | proc_handle.pid = GET_PID (inferior_pid); |
552 | ||
bda9cb72 | 553 | /* Now attempt to open a connection to the thread library. */ |
fb0e1ba7 MK |
554 | err = td_ta_new_p (&proc_handle, &thread_agent); |
555 | switch (err) | |
556 | { | |
557 | case TD_NOLIBTHREAD: | |
bda9cb72 | 558 | /* No thread library was detected. */ |
fb0e1ba7 MK |
559 | break; |
560 | ||
561 | case TD_OK: | |
bda9cb72 MK |
562 | /* The thread library was detected. Activate the thread_db target. */ |
563 | push_target (&thread_db_ops); | |
564 | using_thread_db = 1; | |
565 | ||
566 | /* If the thread library was detected in the main symbol file | |
567 | itself, we assume that the program was statically linked | |
568 | against the thread library and well have to keep this | |
569 | module's target vector activated until forever... Well, at | |
570 | least until all symbols have been discarded anyway (see | |
571 | above). */ | |
572 | if (objfile == symfile_objfile) | |
573 | { | |
574 | gdb_assert (proc_handle.pid == 0); | |
575 | keep_thread_db = 1; | |
576 | } | |
577 | ||
578 | /* We can only poke around if there actually is a child process. | |
579 | If there is no child process alive, postpone the steps below | |
580 | until one has been created. */ | |
581 | if (proc_handle.pid != 0) | |
582 | { | |
583 | enable_thread_event_reporting (); | |
584 | thread_db_find_new_threads (); | |
585 | } | |
fb0e1ba7 MK |
586 | break; |
587 | ||
588 | default: | |
589 | warning ("Cannot initialize thread debugging library: %s", | |
590 | thread_db_err_str (err)); | |
591 | break; | |
592 | } | |
593 | ||
594 | quit: | |
20b8570d MS |
595 | if (new_objfile_event_chain) |
596 | new_objfile_event_chain (objfile); | |
fb0e1ba7 MK |
597 | } |
598 | ||
599 | static void | |
600 | attach_thread (int pid, const td_thrhandle_t *th_p, | |
601 | const td_thrinfo_t *ti_p, int verbose) | |
602 | { | |
603 | struct thread_info *tp; | |
604 | td_err_e err; | |
605 | ||
606 | check_thread_signals (); | |
607 | ||
608 | if (verbose) | |
609 | printf_unfiltered ("[New %s]\n", target_pid_to_str (pid)); | |
610 | ||
611 | /* Add the thread to GDB's thread list. */ | |
612 | tp = add_thread (pid); | |
613 | tp->private = xmalloc (sizeof (struct private_thread_info)); | |
614 | tp->private->lwpid = ti_p->ti_lid; | |
615 | ||
616 | /* Under Linux, we have to attach to each and every thread. */ | |
617 | #ifdef ATTACH_LWP | |
618 | if (ti_p->ti_lid != GET_PID (pid)) | |
619 | ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (pid)), 0); | |
620 | #endif | |
621 | ||
622 | /* Enable thread event reporting for this thread. */ | |
623 | err = td_thr_event_enable_p (th_p, 1); | |
624 | if (err != TD_OK) | |
625 | error ("Cannot enable thread event reporting for %s: %s", | |
626 | target_pid_to_str (pid), thread_db_err_str (err)); | |
627 | } | |
628 | ||
629 | static void | |
630 | detach_thread (int pid, int verbose) | |
631 | { | |
632 | if (verbose) | |
633 | printf_unfiltered ("[%s exited]\n", target_pid_to_str (pid)); | |
634 | } | |
635 | ||
636 | static void | |
637 | thread_db_detach (char *args, int from_tty) | |
638 | { | |
639 | disable_thread_event_reporting (); | |
bda9cb72 | 640 | deactivate_target (); |
fb0e1ba7 MK |
641 | |
642 | target_beneath->to_detach (args, from_tty); | |
643 | } | |
644 | ||
645 | static void | |
646 | thread_db_resume (int pid, int step, enum target_signal signo) | |
647 | { | |
648 | struct cleanup *old_chain = save_inferior_pid (); | |
649 | ||
650 | if (pid == -1) | |
651 | inferior_pid = lwp_from_thread (inferior_pid); | |
652 | else if (is_thread (pid)) | |
653 | pid = lwp_from_thread (pid); | |
654 | ||
655 | target_beneath->to_resume (pid, step, signo); | |
656 | ||
657 | do_cleanups (old_chain); | |
658 | } | |
659 | ||
660 | /* Check if PID is currently stopped at the location of a thread event | |
661 | breakpoint location. If it is, read the event message and act upon | |
662 | the event. */ | |
663 | ||
664 | static void | |
665 | check_event (int pid) | |
666 | { | |
667 | td_event_msg_t msg; | |
668 | td_thrinfo_t ti; | |
669 | td_err_e err; | |
670 | CORE_ADDR stop_pc; | |
671 | ||
672 | /* Bail out early if we're not at a thread event breakpoint. */ | |
673 | stop_pc = read_pc_pid (pid) - DECR_PC_AFTER_BREAK; | |
674 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) | |
675 | return; | |
676 | ||
677 | err = td_ta_event_getmsg_p (thread_agent, &msg); | |
678 | if (err != TD_OK) | |
679 | { | |
680 | if (err == TD_NOMSG) | |
681 | return; | |
682 | ||
683 | error ("Cannot get thread event message: %s", thread_db_err_str (err)); | |
684 | } | |
685 | ||
686 | err = td_thr_get_info_p (msg.th_p, &ti); | |
687 | if (err != TD_OK) | |
688 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
689 | ||
690 | pid = BUILD_THREAD (ti.ti_tid, GET_PID (pid)); | |
691 | ||
692 | switch (msg.event) | |
693 | { | |
694 | case TD_CREATE: | |
695 | #if 0 | |
696 | /* FIXME: kettenis/2000-08-26: Since we use td_ta_event_getmsg, | |
697 | there is no guarantee that the breakpoint will match the | |
698 | event. Should we use td_thr_event_getmsg instead? */ | |
699 | ||
700 | if (stop_pc != td_create_bp_addr) | |
701 | error ("Thread creation event doesn't match breakpoint."); | |
702 | #endif | |
703 | ||
20b8570d MS |
704 | if (in_thread_list (pid)) |
705 | error ("Spurious thread creation event."); | |
706 | ||
707 | attach_thread (pid, msg.th_p, &ti, 1); | |
fb0e1ba7 MK |
708 | return; |
709 | ||
710 | case TD_DEATH: | |
711 | #if 0 | |
712 | /* FIXME: See TD_CREATE. */ | |
713 | ||
714 | if (stop_pc != td_death_bp_addr) | |
715 | error ("Thread death event doesn't match breakpoint."); | |
716 | #endif | |
717 | ||
718 | if (! in_thread_list (pid)) | |
719 | error ("Spurious thread death event."); | |
720 | ||
721 | detach_thread (pid, 1); | |
722 | return; | |
723 | ||
724 | default: | |
725 | error ("Spurious thread event."); | |
726 | } | |
727 | } | |
728 | ||
729 | static int | |
730 | thread_db_wait (int pid, struct target_waitstatus *ourstatus) | |
731 | { | |
732 | extern int trap_pid; | |
733 | ||
734 | if (pid != -1 && is_thread (pid)) | |
735 | pid = lwp_from_thread (pid); | |
736 | ||
737 | pid = target_beneath->to_wait (pid, ourstatus); | |
738 | ||
bda9cb72 MK |
739 | if (proc_handle.pid == 0) |
740 | /* The current child process isn't the actual multi-threaded | |
741 | program yet, so don't try to do any special thread-specific | |
742 | post-processing and bail out early. */ | |
743 | return pid; | |
744 | ||
fb0e1ba7 MK |
745 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
746 | return -1; | |
747 | ||
748 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED | |
749 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
750 | /* Check for a thread event. */ | |
751 | check_event (pid); | |
752 | ||
753 | if (trap_pid) | |
754 | trap_pid = thread_from_lwp (trap_pid); | |
755 | ||
756 | return thread_from_lwp (pid); | |
757 | } | |
758 | ||
759 | static int | |
760 | thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
e5da8f38 | 761 | struct mem_attrib *attrib, |
fb0e1ba7 MK |
762 | struct target_ops *target) |
763 | { | |
764 | struct cleanup *old_chain = save_inferior_pid (); | |
765 | int xfer; | |
766 | ||
767 | if (is_thread (inferior_pid)) | |
768 | { | |
769 | /* FIXME: This seems to be necessary to make sure breakpoints | |
770 | are removed. */ | |
771 | if (! target_thread_alive (inferior_pid)) | |
772 | inferior_pid = GET_PID (inferior_pid); | |
773 | else | |
774 | inferior_pid = lwp_from_thread (inferior_pid); | |
775 | } | |
776 | ||
e5da8f38 | 777 | xfer = target_beneath->to_xfer_memory (memaddr, myaddr, len, write, attrib, target); |
fb0e1ba7 MK |
778 | |
779 | do_cleanups (old_chain); | |
780 | return xfer; | |
781 | } | |
782 | ||
783 | static void | |
784 | thread_db_fetch_registers (int regno) | |
785 | { | |
786 | td_thrhandle_t th; | |
787 | prgregset_t gregset; | |
788 | gdb_prfpregset_t fpregset; | |
789 | td_err_e err; | |
790 | ||
791 | if (! is_thread (inferior_pid)) | |
792 | { | |
793 | /* Pass the request to the target beneath us. */ | |
794 | target_beneath->to_fetch_registers (regno); | |
795 | return; | |
796 | } | |
797 | ||
798 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_pid), &th); | |
799 | if (err != TD_OK) | |
800 | error ("Cannot find thread %ld: %s", | |
801 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
802 | ||
803 | err = td_thr_getgregs_p (&th, gregset); | |
804 | if (err != TD_OK) | |
805 | error ("Cannot fetch general-purpose registers for thread %ld: %s", | |
806 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
807 | ||
808 | err = td_thr_getfpregs_p (&th, &fpregset); | |
809 | if (err != TD_OK) | |
810 | error ("Cannot get floating-point registers for thread %ld: %s", | |
811 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
812 | ||
813 | /* Note that we must call supply_gregset after calling the thread_db | |
814 | routines because the thread_db routines call ps_lgetgregs and | |
815 | friends which clobber GDB's register cache. */ | |
816 | supply_gregset ((gdb_gregset_t *) gregset); | |
817 | supply_fpregset (&fpregset); | |
818 | } | |
819 | ||
820 | static void | |
821 | thread_db_store_registers (int regno) | |
822 | { | |
823 | td_thrhandle_t th; | |
824 | prgregset_t gregset; | |
825 | gdb_prfpregset_t fpregset; | |
826 | td_err_e err; | |
827 | ||
828 | if (! is_thread (inferior_pid)) | |
829 | { | |
830 | /* Pass the request to the target beneath us. */ | |
831 | target_beneath->to_store_registers (regno); | |
832 | return; | |
833 | } | |
834 | ||
835 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_pid), &th); | |
836 | if (err != TD_OK) | |
837 | error ("Cannot find thread %ld: %s", | |
838 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
839 | ||
840 | if (regno != -1) | |
841 | { | |
842 | char raw[MAX_REGISTER_RAW_SIZE]; | |
843 | ||
844 | read_register_gen (regno, raw); | |
845 | thread_db_fetch_registers (-1); | |
846 | supply_register (regno, raw); | |
847 | } | |
848 | ||
849 | fill_gregset ((gdb_gregset_t *) gregset, -1); | |
850 | fill_fpregset (&fpregset, -1); | |
851 | ||
852 | err = td_thr_setgregs_p (&th, gregset); | |
853 | if (err != TD_OK) | |
854 | error ("Cannot store general-purpose registers for thread %ld: %s", | |
855 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
856 | err = td_thr_setfpregs_p (&th, &fpregset); | |
857 | if (err != TD_OK) | |
858 | error ("Cannot store floating-point registers for thread %ld: %s", | |
859 | (long) GET_THREAD (inferior_pid), thread_db_err_str (err)); | |
860 | } | |
861 | ||
862 | static void | |
863 | thread_db_kill (void) | |
864 | { | |
865 | target_beneath->to_kill (); | |
866 | } | |
867 | ||
868 | static void | |
869 | thread_db_create_inferior (char *exec_file, char *allargs, char **env) | |
870 | { | |
bda9cb72 MK |
871 | target_beneath->to_create_inferior (exec_file, allargs, env); |
872 | } | |
fb0e1ba7 | 873 | |
bda9cb72 MK |
874 | static void |
875 | thread_db_post_startup_inferior (int pid) | |
876 | { | |
877 | if (proc_handle.pid == 0) | |
878 | { | |
879 | /* The child process is now the actual multi-threaded | |
880 | program. Snatch its process ID... */ | |
881 | proc_handle.pid = GET_PID (pid); | |
fb0e1ba7 | 882 | |
bda9cb72 MK |
883 | /* ...and perform the remaining initialization steps. */ |
884 | enable_thread_event_reporting (); | |
885 | thread_db_find_new_threads(); | |
886 | } | |
fb0e1ba7 MK |
887 | } |
888 | ||
889 | static void | |
890 | thread_db_mourn_inferior (void) | |
891 | { | |
892 | remove_thread_event_breakpoints (); | |
bda9cb72 | 893 | deactivate_target (); |
fb0e1ba7 MK |
894 | |
895 | target_beneath->to_mourn_inferior (); | |
896 | } | |
897 | ||
898 | static int | |
899 | thread_db_thread_alive (int pid) | |
900 | { | |
901 | if (is_thread (pid)) | |
902 | { | |
903 | td_thrhandle_t th; | |
904 | td_err_e err; | |
905 | ||
906 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th); | |
907 | if (err != TD_OK) | |
908 | return 0; | |
909 | ||
910 | err = td_thr_validate_p (&th); | |
911 | if (err != TD_OK) | |
912 | return 0; | |
913 | ||
914 | return 1; | |
915 | } | |
916 | ||
917 | if (target_beneath->to_thread_alive) | |
918 | return target_beneath->to_thread_alive (pid); | |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
923 | static int | |
924 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
925 | { | |
926 | td_thrinfo_t ti; | |
927 | td_err_e err; | |
928 | int pid; | |
929 | ||
930 | err = td_thr_get_info_p (th_p, &ti); | |
931 | if (err != TD_OK) | |
932 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
933 | ||
934 | pid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_pid)); | |
935 | ||
936 | if (! in_thread_list (pid)) | |
937 | attach_thread (pid, th_p, &ti, 1); | |
938 | ||
939 | return 0; | |
940 | } | |
941 | ||
942 | static void | |
943 | thread_db_find_new_threads (void) | |
944 | { | |
945 | td_err_e err; | |
946 | ||
947 | /* Iterate over all user-space threads to discover new threads. */ | |
948 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, | |
949 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
950 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
951 | if (err != TD_OK) | |
952 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
953 | } | |
954 | ||
955 | static char * | |
956 | thread_db_pid_to_str (int pid) | |
957 | { | |
958 | if (is_thread (pid)) | |
959 | { | |
960 | static char buf[64]; | |
961 | td_thrhandle_t th; | |
962 | td_thrinfo_t ti; | |
963 | td_err_e err; | |
964 | ||
965 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th); | |
966 | if (err != TD_OK) | |
967 | error ("Cannot find thread %ld: %s", | |
968 | (long) GET_THREAD (pid), thread_db_err_str (err)); | |
969 | ||
970 | err = td_thr_get_info_p (&th, &ti); | |
971 | if (err != TD_OK) | |
972 | error ("Cannot get thread info for thread %ld: %s", | |
973 | (long) GET_THREAD (pid), thread_db_err_str (err)); | |
974 | ||
975 | if (ti.ti_state == TD_THR_ACTIVE && ti.ti_lid != 0) | |
976 | { | |
977 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", | |
978 | (long) ti.ti_tid, ti.ti_lid); | |
979 | } | |
980 | else | |
981 | { | |
982 | snprintf (buf, sizeof (buf), "Thread %ld (%s)", | |
983 | (long) ti.ti_tid, thread_db_state_str (ti.ti_state)); | |
984 | } | |
985 | ||
986 | return buf; | |
987 | } | |
988 | ||
989 | if (target_beneath->to_pid_to_str (pid)) | |
990 | return target_beneath->to_pid_to_str (pid); | |
991 | ||
992 | return normal_pid_to_str (pid); | |
993 | } | |
994 | ||
995 | static void | |
996 | init_thread_db_ops (void) | |
997 | { | |
998 | thread_db_ops.to_shortname = "multi-thread"; | |
999 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1000 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
1001 | thread_db_ops.to_detach = thread_db_detach; | |
1002 | thread_db_ops.to_resume = thread_db_resume; | |
1003 | thread_db_ops.to_wait = thread_db_wait; | |
1004 | thread_db_ops.to_fetch_registers = thread_db_fetch_registers; | |
1005 | thread_db_ops.to_store_registers = thread_db_store_registers; | |
1006 | thread_db_ops.to_xfer_memory = thread_db_xfer_memory; | |
1007 | thread_db_ops.to_kill = thread_db_kill; | |
1008 | thread_db_ops.to_create_inferior = thread_db_create_inferior; | |
bda9cb72 | 1009 | thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior; |
fb0e1ba7 MK |
1010 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
1011 | thread_db_ops.to_thread_alive = thread_db_thread_alive; | |
1012 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; | |
1013 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1014 | thread_db_ops.to_stratum = thread_stratum; | |
1015 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
1016 | thread_db_ops.to_magic = OPS_MAGIC; | |
1017 | } | |
1018 | ||
1019 | void | |
1020 | _initialize_thread_db (void) | |
1021 | { | |
1022 | /* Only initialize the module if we can load libthread_db. */ | |
1023 | if (thread_db_load ()) | |
1024 | { | |
1025 | init_thread_db_ops (); | |
1026 | add_target (&thread_db_ops); | |
1027 | ||
1028 | /* Add ourselves to objfile event chain. */ | |
20b8570d | 1029 | new_objfile_event_chain = target_new_objfile_hook; |
fb0e1ba7 MK |
1030 | target_new_objfile_hook = thread_db_new_objfile; |
1031 | } | |
20b8570d MS |
1032 | add_show_from_set (add_set_cmd ("debug-linux-threads", class_support, |
1033 | var_boolean, (char *) &debug_linux_threads, | |
1034 | "Set debug output for linux-threads \ | |
1035 | on or off.\nUse \"on\" to enable, \"off\" to disable.", &setlist), | |
1036 | &showlist); | |
fb0e1ba7 | 1037 | } |