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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. */ | |
540af400 | 54 | static void (*target_new_objfile_chain) (struct objfile *objfile); |
fb0e1ba7 MK |
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) | |
39f77062 KB |
127 | #define PIDGET0(PID) (((PID) & 0xffff)) |
128 | #define PIDGET(PID) ((PIDGET0 (PID) == 0xffff) ? -1 : PIDGET0 (PID)) | |
fb0e1ba7 MK |
129 | #define MERGEPID(PID, TID) (((PID) & 0xffff) | ((TID) << 16)) |
130 | #endif | |
131 | ||
132 | #define THREAD_FLAG 0x80000000 | |
133 | ||
134 | #define is_lwp(pid) (((pid) & THREAD_FLAG) == 0 && TIDGET (pid)) | |
135 | #define is_thread(pid) ((pid) & THREAD_FLAG) | |
136 | ||
137 | #define GET_PID(pid) PIDGET (pid) | |
138 | #define GET_LWP(pid) TIDGET (pid) | |
139 | #define GET_THREAD(pid) TIDGET (pid) | |
140 | ||
141 | #define BUILD_LWP(tid, pid) MERGEPID (pid, tid) | |
142 | #define BUILD_THREAD(tid, pid) (MERGEPID (pid, tid) | THREAD_FLAG) | |
143 | \f | |
144 | ||
145 | struct private_thread_info | |
146 | { | |
147 | /* Cached LWP id. Must come first, see lin-lwp.c. */ | |
148 | lwpid_t lwpid; | |
149 | }; | |
150 | ||
151 | \f | |
152 | /* Helper functions. */ | |
153 | ||
154 | static void | |
39f77062 | 155 | restore_inferior_ptid (void *arg) |
fb0e1ba7 | 156 | { |
39f77062 KB |
157 | ptid_t *saved_ptid_ptr = arg; |
158 | inferior_ptid = *saved_ptid_ptr; | |
b8c9b27d | 159 | xfree (arg); |
fb0e1ba7 MK |
160 | } |
161 | ||
162 | static struct cleanup * | |
39f77062 | 163 | save_inferior_ptid (void) |
fb0e1ba7 | 164 | { |
39f77062 | 165 | ptid_t *saved_ptid_ptr; |
fb0e1ba7 | 166 | |
39f77062 KB |
167 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); |
168 | *saved_ptid_ptr = inferior_ptid; | |
169 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
fb0e1ba7 MK |
170 | } |
171 | \f | |
172 | ||
173 | static char * | |
174 | thread_db_err_str (td_err_e err) | |
175 | { | |
176 | static char buf[64]; | |
177 | ||
178 | switch (err) | |
179 | { | |
180 | case TD_OK: | |
181 | return "generic 'call succeeded'"; | |
182 | case TD_ERR: | |
183 | return "generic error"; | |
184 | case TD_NOTHR: | |
185 | return "no thread to satisfy query"; | |
186 | case TD_NOSV: | |
187 | return "no sync handle to satisfy query"; | |
188 | case TD_NOLWP: | |
189 | return "no LWP to satisfy query"; | |
190 | case TD_BADPH: | |
191 | return "invalid process handle"; | |
192 | case TD_BADTH: | |
193 | return "invalid thread handle"; | |
194 | case TD_BADSH: | |
195 | return "invalid synchronization handle"; | |
196 | case TD_BADTA: | |
197 | return "invalid thread agent"; | |
198 | case TD_BADKEY: | |
199 | return "invalid key"; | |
200 | case TD_NOMSG: | |
201 | return "no event message for getmsg"; | |
202 | case TD_NOFPREGS: | |
203 | return "FPU register set not available"; | |
204 | case TD_NOLIBTHREAD: | |
205 | return "application not linked with libthread"; | |
206 | case TD_NOEVENT: | |
207 | return "requested event is not supported"; | |
208 | case TD_NOCAPAB: | |
209 | return "capability not available"; | |
210 | case TD_DBERR: | |
211 | return "debugger service failed"; | |
212 | case TD_NOAPLIC: | |
213 | return "operation not applicable to"; | |
214 | case TD_NOTSD: | |
215 | return "no thread-specific data for this thread"; | |
216 | case TD_MALLOC: | |
217 | return "malloc failed"; | |
218 | case TD_PARTIALREG: | |
219 | return "only part of register set was written/read"; | |
220 | case TD_NOXREGS: | |
221 | return "X register set not available for this thread"; | |
222 | default: | |
223 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
224 | return buf; | |
225 | } | |
226 | } | |
227 | ||
228 | static char * | |
229 | thread_db_state_str (td_thr_state_e state) | |
230 | { | |
231 | static char buf[64]; | |
232 | ||
233 | switch (state) | |
234 | { | |
235 | case TD_THR_STOPPED: | |
236 | return "stopped by debugger"; | |
237 | case TD_THR_RUN: | |
238 | return "runnable"; | |
239 | case TD_THR_ACTIVE: | |
240 | return "active"; | |
241 | case TD_THR_ZOMBIE: | |
242 | return "zombie"; | |
243 | case TD_THR_SLEEP: | |
244 | return "sleeping"; | |
245 | case TD_THR_STOPPED_ASLEEP: | |
246 | return "stopped by debugger AND blocked"; | |
247 | default: | |
248 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
249 | return buf; | |
250 | } | |
251 | } | |
252 | \f | |
253 | ||
254 | /* Convert between user-level thread ids and LWP ids. */ | |
255 | ||
39f77062 KB |
256 | static ptid_t |
257 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 MK |
258 | { |
259 | td_thrinfo_t ti; | |
260 | td_thrhandle_t th; | |
261 | td_err_e err; | |
262 | ||
39f77062 KB |
263 | if (GET_LWP (ptid) == 0) |
264 | ptid = BUILD_LWP (GET_PID (ptid), GET_PID (ptid)); | |
fb0e1ba7 | 265 | |
39f77062 | 266 | gdb_assert (is_lwp (ptid)); |
fb0e1ba7 | 267 | |
39f77062 | 268 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); |
fb0e1ba7 MK |
269 | if (err != TD_OK) |
270 | error ("Cannot find user-level thread for LWP %d: %s", | |
39f77062 | 271 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
272 | |
273 | err = td_thr_get_info_p (&th, &ti); | |
274 | if (err != TD_OK) | |
275 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
276 | ||
39f77062 | 277 | return BUILD_THREAD (ti.ti_tid, GET_PID (ptid)); |
fb0e1ba7 MK |
278 | } |
279 | ||
39f77062 KB |
280 | static ptid_t |
281 | lwp_from_thread (ptid_t ptid) | |
fb0e1ba7 MK |
282 | { |
283 | td_thrinfo_t ti; | |
284 | td_thrhandle_t th; | |
285 | td_err_e err; | |
286 | ||
39f77062 KB |
287 | if (! is_thread (ptid)) |
288 | return ptid; | |
fb0e1ba7 | 289 | |
39f77062 | 290 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th); |
fb0e1ba7 MK |
291 | if (err != TD_OK) |
292 | error ("Cannot find thread %ld: %s", | |
39f77062 | 293 | (long) GET_THREAD (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
294 | |
295 | err = td_thr_get_info_p (&th, &ti); | |
296 | if (err != TD_OK) | |
297 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
298 | ||
39f77062 | 299 | return BUILD_LWP (ti.ti_lid, GET_PID (ptid)); |
fb0e1ba7 MK |
300 | } |
301 | \f | |
302 | ||
303 | void | |
304 | thread_db_init (struct target_ops *target) | |
305 | { | |
306 | target_beneath = target; | |
307 | } | |
308 | ||
309 | static int | |
310 | thread_db_load (void) | |
311 | { | |
312 | void *handle; | |
313 | td_err_e err; | |
314 | ||
315 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); | |
316 | if (handle == NULL) | |
317 | return 0; | |
318 | ||
319 | /* Initialize pointers to the dynamic library functions we will use. | |
320 | Essential functions first. */ | |
321 | ||
322 | td_init_p = dlsym (handle, "td_init"); | |
323 | if (td_init_p == NULL) | |
324 | return 0; | |
325 | ||
326 | td_ta_new_p = dlsym (handle, "td_ta_new"); | |
327 | if (td_ta_new_p == NULL) | |
328 | return 0; | |
329 | ||
330 | td_ta_map_id2thr_p = dlsym (handle, "td_ta_map_id2thr"); | |
331 | if (td_ta_map_id2thr_p == NULL) | |
332 | return 0; | |
333 | ||
334 | td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr"); | |
335 | if (td_ta_map_lwp2thr_p == NULL) | |
336 | return 0; | |
337 | ||
338 | td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter"); | |
339 | if (td_ta_thr_iter_p == NULL) | |
340 | return 0; | |
341 | ||
342 | td_thr_validate_p = dlsym (handle, "td_thr_validate"); | |
343 | if (td_thr_validate_p == NULL) | |
344 | return 0; | |
345 | ||
346 | td_thr_get_info_p = dlsym (handle, "td_thr_get_info"); | |
347 | if (td_thr_get_info_p == NULL) | |
348 | return 0; | |
349 | ||
350 | td_thr_getfpregs_p = dlsym (handle, "td_thr_getfpregs"); | |
351 | if (td_thr_getfpregs_p == NULL) | |
352 | return 0; | |
353 | ||
354 | td_thr_getgregs_p = dlsym (handle, "td_thr_getgregs"); | |
355 | if (td_thr_getgregs_p == NULL) | |
356 | return 0; | |
357 | ||
358 | td_thr_setfpregs_p = dlsym (handle, "td_thr_setfpregs"); | |
359 | if (td_thr_setfpregs_p == NULL) | |
360 | return 0; | |
361 | ||
362 | td_thr_setgregs_p = dlsym (handle, "td_thr_setgregs"); | |
363 | if (td_thr_setgregs_p == NULL) | |
364 | return 0; | |
365 | ||
366 | /* Initialize the library. */ | |
367 | err = td_init_p (); | |
368 | if (err != TD_OK) | |
369 | { | |
370 | warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err)); | |
371 | return 0; | |
372 | } | |
373 | ||
374 | /* These are not essential. */ | |
375 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); | |
376 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); | |
377 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); | |
378 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); | |
379 | ||
380 | return 1; | |
381 | } | |
382 | ||
383 | static void | |
384 | enable_thread_event_reporting (void) | |
385 | { | |
386 | td_thr_events_t events; | |
387 | td_notify_t notify; | |
388 | td_err_e err; | |
389 | ||
390 | /* We cannot use the thread event reporting facility if these | |
391 | functions aren't available. */ | |
392 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL | |
393 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) | |
394 | return; | |
395 | ||
396 | /* Set the process wide mask saying which events we're interested in. */ | |
397 | td_event_emptyset (&events); | |
398 | td_event_addset (&events, TD_CREATE); | |
399 | #if 0 | |
400 | /* FIXME: kettenis/2000-04-23: The event reporting facility is | |
401 | broken for TD_DEATH events in glibc 2.1.3, so don't enable it for | |
402 | now. */ | |
403 | td_event_addset (&events, TD_DEATH); | |
404 | #endif | |
405 | ||
406 | err = td_ta_set_event_p (thread_agent, &events); | |
407 | if (err != TD_OK) | |
408 | { | |
409 | warning ("Unable to set global thread event mask: %s", | |
410 | thread_db_err_str (err)); | |
411 | return; | |
412 | } | |
413 | ||
414 | /* Delete previous thread event breakpoints, if any. */ | |
415 | remove_thread_event_breakpoints (); | |
416 | ||
417 | /* Get address for thread creation breakpoint. */ | |
418 | err = td_ta_event_addr_p (thread_agent, TD_CREATE, ¬ify); | |
419 | if (err != TD_OK) | |
420 | { | |
421 | warning ("Unable to get location for thread creation breakpoint: %s", | |
422 | thread_db_err_str (err)); | |
423 | return; | |
424 | } | |
425 | ||
426 | /* Set up the breakpoint. */ | |
427 | td_create_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
428 | create_thread_event_breakpoint (td_create_bp_addr); | |
429 | ||
430 | /* Get address for thread death breakpoint. */ | |
431 | err = td_ta_event_addr_p (thread_agent, TD_DEATH, ¬ify); | |
432 | if (err != TD_OK) | |
433 | { | |
434 | warning ("Unable to get location for thread creation breakpoint: %s", | |
435 | thread_db_err_str (err)); | |
436 | return; | |
437 | } | |
438 | ||
439 | /* Set up the breakpoint. */ | |
440 | td_death_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
441 | create_thread_event_breakpoint (td_death_bp_addr); | |
442 | } | |
443 | ||
444 | static void | |
445 | disable_thread_event_reporting (void) | |
446 | { | |
447 | td_thr_events_t events; | |
448 | ||
449 | /* Set the process wide mask saying we aren't interested in any | |
450 | events anymore. */ | |
451 | td_event_emptyset (&events); | |
452 | td_ta_set_event_p (thread_agent, &events); | |
453 | ||
454 | /* Delete thread event breakpoints, if any. */ | |
455 | remove_thread_event_breakpoints (); | |
456 | td_create_bp_addr = 0; | |
457 | td_death_bp_addr = 0; | |
458 | } | |
459 | ||
460 | static void | |
461 | check_thread_signals (void) | |
462 | { | |
463 | #ifdef GET_THREAD_SIGNALS | |
464 | if (! thread_signals) | |
465 | { | |
466 | sigset_t mask; | |
467 | int i; | |
468 | ||
469 | GET_THREAD_SIGNALS (&mask); | |
470 | sigemptyset (&thread_stop_set); | |
471 | sigemptyset (&thread_print_set); | |
472 | ||
b9569773 | 473 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
474 | { |
475 | if (sigismember (&mask, i)) | |
476 | { | |
477 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
478 | sigaddset (&thread_stop_set, i); | |
479 | if (signal_print_update (target_signal_from_host (i), 0)) | |
480 | sigaddset (&thread_print_set, i); | |
481 | thread_signals = 1; | |
482 | } | |
483 | } | |
484 | } | |
485 | #endif | |
486 | } | |
487 | ||
488 | static void | |
489 | disable_thread_signals (void) | |
490 | { | |
491 | #ifdef GET_THREAD_SIGNALS | |
492 | if (thread_signals) | |
493 | { | |
494 | int i; | |
495 | ||
b9569773 | 496 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
497 | { |
498 | if (sigismember (&thread_stop_set, i)) | |
499 | signal_stop_update (target_signal_from_host (i), 1); | |
500 | if (sigismember (&thread_print_set, i)) | |
501 | signal_print_update (target_signal_from_host (i), 1); | |
502 | } | |
503 | ||
504 | thread_signals = 0; | |
505 | } | |
506 | #endif | |
507 | } | |
508 | ||
509 | static void | |
bda9cb72 | 510 | deactivate_target (void) |
fb0e1ba7 | 511 | { |
bda9cb72 MK |
512 | /* Forget about the child's process ID. We shouldn't need it |
513 | anymore. */ | |
514 | proc_handle.pid = 0; | |
fb0e1ba7 | 515 | |
bda9cb72 MK |
516 | if (! keep_thread_db) |
517 | { | |
518 | using_thread_db = 0; | |
519 | unpush_target (&thread_db_ops); | |
520 | } | |
fb0e1ba7 MK |
521 | } |
522 | ||
523 | static void | |
524 | thread_db_new_objfile (struct objfile *objfile) | |
525 | { | |
526 | td_err_e err; | |
527 | ||
bda9cb72 MK |
528 | if (objfile == NULL) |
529 | { | |
530 | /* All symbols have been discarded. If the thread_db target is | |
531 | active, deactivate it now, even if the application was linked | |
532 | statically against the thread library. */ | |
533 | keep_thread_db = 0; | |
534 | if (using_thread_db) | |
535 | deactivate_target (); | |
536 | ||
537 | goto quit; | |
538 | } | |
539 | ||
fb0e1ba7 MK |
540 | if (using_thread_db) |
541 | /* Nothing to do. The thread library was already detected and the | |
542 | target vector was already activated. */ | |
543 | goto quit; | |
544 | ||
bda9cb72 MK |
545 | /* Initialize the structure that identifies the child process. Note |
546 | that at this point there is no guarantee that we actually have a | |
547 | child process. */ | |
39f77062 | 548 | proc_handle.pid = GET_PID (inferior_ptid); |
fb0e1ba7 | 549 | |
bda9cb72 | 550 | /* Now attempt to open a connection to the thread library. */ |
fb0e1ba7 MK |
551 | err = td_ta_new_p (&proc_handle, &thread_agent); |
552 | switch (err) | |
553 | { | |
554 | case TD_NOLIBTHREAD: | |
bda9cb72 | 555 | /* No thread library was detected. */ |
fb0e1ba7 MK |
556 | break; |
557 | ||
558 | case TD_OK: | |
bda9cb72 MK |
559 | /* The thread library was detected. Activate the thread_db target. */ |
560 | push_target (&thread_db_ops); | |
561 | using_thread_db = 1; | |
562 | ||
563 | /* If the thread library was detected in the main symbol file | |
564 | itself, we assume that the program was statically linked | |
565 | against the thread library and well have to keep this | |
566 | module's target vector activated until forever... Well, at | |
567 | least until all symbols have been discarded anyway (see | |
568 | above). */ | |
569 | if (objfile == symfile_objfile) | |
570 | { | |
571 | gdb_assert (proc_handle.pid == 0); | |
572 | keep_thread_db = 1; | |
573 | } | |
574 | ||
575 | /* We can only poke around if there actually is a child process. | |
576 | If there is no child process alive, postpone the steps below | |
577 | until one has been created. */ | |
578 | if (proc_handle.pid != 0) | |
579 | { | |
580 | enable_thread_event_reporting (); | |
581 | thread_db_find_new_threads (); | |
582 | } | |
fb0e1ba7 MK |
583 | break; |
584 | ||
585 | default: | |
586 | warning ("Cannot initialize thread debugging library: %s", | |
587 | thread_db_err_str (err)); | |
588 | break; | |
589 | } | |
590 | ||
591 | quit: | |
540af400 MS |
592 | if (target_new_objfile_chain) |
593 | target_new_objfile_chain (objfile); | |
fb0e1ba7 MK |
594 | } |
595 | ||
596 | static void | |
39f77062 | 597 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
fb0e1ba7 MK |
598 | const td_thrinfo_t *ti_p, int verbose) |
599 | { | |
600 | struct thread_info *tp; | |
601 | td_err_e err; | |
602 | ||
603 | check_thread_signals (); | |
604 | ||
605 | if (verbose) | |
39f77062 | 606 | printf_unfiltered ("[New %s]\n", target_pid_to_str (ptid)); |
fb0e1ba7 MK |
607 | |
608 | /* Add the thread to GDB's thread list. */ | |
39f77062 | 609 | tp = add_thread (ptid); |
fb0e1ba7 MK |
610 | tp->private = xmalloc (sizeof (struct private_thread_info)); |
611 | tp->private->lwpid = ti_p->ti_lid; | |
612 | ||
613 | /* Under Linux, we have to attach to each and every thread. */ | |
614 | #ifdef ATTACH_LWP | |
39f77062 KB |
615 | if (ti_p->ti_lid != GET_PID (ptid)) |
616 | ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0); | |
fb0e1ba7 MK |
617 | #endif |
618 | ||
619 | /* Enable thread event reporting for this thread. */ | |
620 | err = td_thr_event_enable_p (th_p, 1); | |
621 | if (err != TD_OK) | |
622 | error ("Cannot enable thread event reporting for %s: %s", | |
39f77062 | 623 | target_pid_to_str (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
624 | } |
625 | ||
626 | static void | |
39f77062 | 627 | detach_thread (ptid_t ptid, int verbose) |
fb0e1ba7 MK |
628 | { |
629 | if (verbose) | |
39f77062 | 630 | printf_unfiltered ("[%s exited]\n", target_pid_to_str (ptid)); |
fb0e1ba7 MK |
631 | } |
632 | ||
633 | static void | |
634 | thread_db_detach (char *args, int from_tty) | |
635 | { | |
636 | disable_thread_event_reporting (); | |
bda9cb72 | 637 | deactivate_target (); |
fb0e1ba7 MK |
638 | |
639 | target_beneath->to_detach (args, from_tty); | |
640 | } | |
641 | ||
642 | static void | |
39f77062 | 643 | thread_db_resume (ptid_t ptid, int step, enum target_signal signo) |
fb0e1ba7 | 644 | { |
39f77062 | 645 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 | 646 | |
39f77062 KB |
647 | if (GET_PID (ptid) == -1) |
648 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
649 | else if (is_thread (ptid)) | |
650 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 651 | |
39f77062 | 652 | target_beneath->to_resume (ptid, step, signo); |
fb0e1ba7 MK |
653 | |
654 | do_cleanups (old_chain); | |
655 | } | |
656 | ||
657 | /* Check if PID is currently stopped at the location of a thread event | |
658 | breakpoint location. If it is, read the event message and act upon | |
659 | the event. */ | |
660 | ||
661 | static void | |
39f77062 | 662 | check_event (ptid_t ptid) |
fb0e1ba7 MK |
663 | { |
664 | td_event_msg_t msg; | |
665 | td_thrinfo_t ti; | |
666 | td_err_e err; | |
667 | CORE_ADDR stop_pc; | |
668 | ||
669 | /* Bail out early if we're not at a thread event breakpoint. */ | |
39f77062 | 670 | stop_pc = read_pc_pid (ptid) - DECR_PC_AFTER_BREAK; |
fb0e1ba7 MK |
671 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) |
672 | return; | |
673 | ||
674 | err = td_ta_event_getmsg_p (thread_agent, &msg); | |
675 | if (err != TD_OK) | |
676 | { | |
677 | if (err == TD_NOMSG) | |
678 | return; | |
679 | ||
680 | error ("Cannot get thread event message: %s", thread_db_err_str (err)); | |
681 | } | |
682 | ||
683 | err = td_thr_get_info_p (msg.th_p, &ti); | |
684 | if (err != TD_OK) | |
685 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
686 | ||
39f77062 | 687 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (ptid)); |
fb0e1ba7 MK |
688 | |
689 | switch (msg.event) | |
690 | { | |
691 | case TD_CREATE: | |
692 | #if 0 | |
693 | /* FIXME: kettenis/2000-08-26: Since we use td_ta_event_getmsg, | |
694 | there is no guarantee that the breakpoint will match the | |
695 | event. Should we use td_thr_event_getmsg instead? */ | |
696 | ||
697 | if (stop_pc != td_create_bp_addr) | |
698 | error ("Thread creation event doesn't match breakpoint."); | |
699 | #endif | |
700 | ||
540af400 MS |
701 | /* We may already know about this thread, for instance when the |
702 | user has issued the `info threads' command before the SIGTRAP | |
703 | for hitting the thread creation breakpoint was reported. */ | |
39f77062 KB |
704 | if (! in_thread_list (ptid)) |
705 | attach_thread (ptid, msg.th_p, &ti, 1); | |
fb0e1ba7 MK |
706 | return; |
707 | ||
708 | case TD_DEATH: | |
709 | #if 0 | |
710 | /* FIXME: See TD_CREATE. */ | |
711 | ||
712 | if (stop_pc != td_death_bp_addr) | |
713 | error ("Thread death event doesn't match breakpoint."); | |
714 | #endif | |
715 | ||
39f77062 | 716 | if (! in_thread_list (ptid)) |
fb0e1ba7 MK |
717 | error ("Spurious thread death event."); |
718 | ||
39f77062 | 719 | detach_thread (ptid, 1); |
fb0e1ba7 MK |
720 | return; |
721 | ||
722 | default: | |
723 | error ("Spurious thread event."); | |
724 | } | |
725 | } | |
726 | ||
39f77062 KB |
727 | static ptid_t |
728 | thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
fb0e1ba7 | 729 | { |
39f77062 | 730 | extern ptid_t trap_ptid; |
fb0e1ba7 | 731 | |
39f77062 KB |
732 | if (GET_PID (ptid) != -1 && is_thread (ptid)) |
733 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 734 | |
39f77062 | 735 | ptid = target_beneath->to_wait (ptid, ourstatus); |
fb0e1ba7 | 736 | |
bda9cb72 MK |
737 | if (proc_handle.pid == 0) |
738 | /* The current child process isn't the actual multi-threaded | |
739 | program yet, so don't try to do any special thread-specific | |
740 | post-processing and bail out early. */ | |
39f77062 | 741 | return ptid; |
bda9cb72 | 742 | |
fb0e1ba7 | 743 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
39f77062 | 744 | return pid_to_ptid (-1); |
fb0e1ba7 MK |
745 | |
746 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED | |
747 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
748 | /* Check for a thread event. */ | |
39f77062 | 749 | check_event (ptid); |
fb0e1ba7 | 750 | |
39f77062 KB |
751 | if (!ptid_equal (trap_ptid, null_ptid)) |
752 | trap_ptid = thread_from_lwp (trap_ptid); | |
fb0e1ba7 | 753 | |
39f77062 | 754 | return thread_from_lwp (ptid); |
fb0e1ba7 MK |
755 | } |
756 | ||
757 | static int | |
758 | thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
e5da8f38 | 759 | struct mem_attrib *attrib, |
fb0e1ba7 MK |
760 | struct target_ops *target) |
761 | { | |
39f77062 | 762 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 MK |
763 | int xfer; |
764 | ||
39f77062 | 765 | if (is_thread (inferior_ptid)) |
fb0e1ba7 MK |
766 | { |
767 | /* FIXME: This seems to be necessary to make sure breakpoints | |
768 | are removed. */ | |
39f77062 KB |
769 | if (! target_thread_alive (inferior_ptid)) |
770 | inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); | |
fb0e1ba7 | 771 | else |
39f77062 | 772 | inferior_ptid = lwp_from_thread (inferior_ptid); |
fb0e1ba7 MK |
773 | } |
774 | ||
e5da8f38 | 775 | xfer = target_beneath->to_xfer_memory (memaddr, myaddr, len, write, attrib, target); |
fb0e1ba7 MK |
776 | |
777 | do_cleanups (old_chain); | |
778 | return xfer; | |
779 | } | |
780 | ||
781 | static void | |
782 | thread_db_fetch_registers (int regno) | |
783 | { | |
784 | td_thrhandle_t th; | |
785 | prgregset_t gregset; | |
786 | gdb_prfpregset_t fpregset; | |
787 | td_err_e err; | |
788 | ||
39f77062 | 789 | if (! is_thread (inferior_ptid)) |
fb0e1ba7 MK |
790 | { |
791 | /* Pass the request to the target beneath us. */ | |
792 | target_beneath->to_fetch_registers (regno); | |
793 | return; | |
794 | } | |
795 | ||
39f77062 | 796 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_ptid), &th); |
fb0e1ba7 MK |
797 | if (err != TD_OK) |
798 | error ("Cannot find thread %ld: %s", | |
39f77062 | 799 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
800 | |
801 | err = td_thr_getgregs_p (&th, gregset); | |
802 | if (err != TD_OK) | |
803 | error ("Cannot fetch general-purpose registers for thread %ld: %s", | |
39f77062 | 804 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
805 | |
806 | err = td_thr_getfpregs_p (&th, &fpregset); | |
807 | if (err != TD_OK) | |
808 | error ("Cannot get floating-point registers for thread %ld: %s", | |
39f77062 | 809 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
810 | |
811 | /* Note that we must call supply_gregset after calling the thread_db | |
812 | routines because the thread_db routines call ps_lgetgregs and | |
813 | friends which clobber GDB's register cache. */ | |
814 | supply_gregset ((gdb_gregset_t *) gregset); | |
815 | supply_fpregset (&fpregset); | |
816 | } | |
817 | ||
818 | static void | |
819 | thread_db_store_registers (int regno) | |
820 | { | |
821 | td_thrhandle_t th; | |
822 | prgregset_t gregset; | |
823 | gdb_prfpregset_t fpregset; | |
824 | td_err_e err; | |
825 | ||
39f77062 | 826 | if (! is_thread (inferior_ptid)) |
fb0e1ba7 MK |
827 | { |
828 | /* Pass the request to the target beneath us. */ | |
829 | target_beneath->to_store_registers (regno); | |
830 | return; | |
831 | } | |
832 | ||
39f77062 | 833 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_ptid), &th); |
fb0e1ba7 MK |
834 | if (err != TD_OK) |
835 | error ("Cannot find thread %ld: %s", | |
39f77062 | 836 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
837 | |
838 | if (regno != -1) | |
839 | { | |
840 | char raw[MAX_REGISTER_RAW_SIZE]; | |
841 | ||
842 | read_register_gen (regno, raw); | |
843 | thread_db_fetch_registers (-1); | |
844 | supply_register (regno, raw); | |
845 | } | |
846 | ||
847 | fill_gregset ((gdb_gregset_t *) gregset, -1); | |
848 | fill_fpregset (&fpregset, -1); | |
849 | ||
850 | err = td_thr_setgregs_p (&th, gregset); | |
851 | if (err != TD_OK) | |
852 | error ("Cannot store general-purpose registers for thread %ld: %s", | |
39f77062 | 853 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
854 | err = td_thr_setfpregs_p (&th, &fpregset); |
855 | if (err != TD_OK) | |
856 | error ("Cannot store floating-point registers for thread %ld: %s", | |
39f77062 | 857 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
858 | } |
859 | ||
860 | static void | |
861 | thread_db_kill (void) | |
862 | { | |
863 | target_beneath->to_kill (); | |
864 | } | |
865 | ||
866 | static void | |
867 | thread_db_create_inferior (char *exec_file, char *allargs, char **env) | |
868 | { | |
bda9cb72 MK |
869 | target_beneath->to_create_inferior (exec_file, allargs, env); |
870 | } | |
fb0e1ba7 | 871 | |
bda9cb72 | 872 | static void |
39f77062 | 873 | thread_db_post_startup_inferior (ptid_t ptid) |
bda9cb72 MK |
874 | { |
875 | if (proc_handle.pid == 0) | |
876 | { | |
877 | /* The child process is now the actual multi-threaded | |
878 | program. Snatch its process ID... */ | |
39f77062 | 879 | proc_handle.pid = GET_PID (ptid); |
fb0e1ba7 | 880 | |
bda9cb72 MK |
881 | /* ...and perform the remaining initialization steps. */ |
882 | enable_thread_event_reporting (); | |
883 | thread_db_find_new_threads(); | |
884 | } | |
fb0e1ba7 MK |
885 | } |
886 | ||
887 | static void | |
888 | thread_db_mourn_inferior (void) | |
889 | { | |
890 | remove_thread_event_breakpoints (); | |
bda9cb72 | 891 | deactivate_target (); |
fb0e1ba7 MK |
892 | |
893 | target_beneath->to_mourn_inferior (); | |
894 | } | |
895 | ||
896 | static int | |
39f77062 | 897 | thread_db_thread_alive (ptid_t ptid) |
fb0e1ba7 | 898 | { |
39f77062 | 899 | if (is_thread (ptid)) |
fb0e1ba7 MK |
900 | { |
901 | td_thrhandle_t th; | |
902 | td_err_e err; | |
903 | ||
39f77062 | 904 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th); |
fb0e1ba7 MK |
905 | if (err != TD_OK) |
906 | return 0; | |
907 | ||
908 | err = td_thr_validate_p (&th); | |
909 | if (err != TD_OK) | |
910 | return 0; | |
911 | ||
912 | return 1; | |
913 | } | |
914 | ||
915 | if (target_beneath->to_thread_alive) | |
39f77062 | 916 | return target_beneath->to_thread_alive (ptid); |
fb0e1ba7 MK |
917 | |
918 | return 0; | |
919 | } | |
920 | ||
921 | static int | |
922 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
923 | { | |
924 | td_thrinfo_t ti; | |
925 | td_err_e err; | |
39f77062 | 926 | ptid_t ptid; |
fb0e1ba7 MK |
927 | |
928 | err = td_thr_get_info_p (th_p, &ti); | |
929 | if (err != TD_OK) | |
930 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
931 | ||
39f77062 | 932 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid)); |
fb0e1ba7 | 933 | |
39f77062 KB |
934 | if (! in_thread_list (ptid)) |
935 | attach_thread (ptid, th_p, &ti, 1); | |
fb0e1ba7 MK |
936 | |
937 | return 0; | |
938 | } | |
939 | ||
940 | static void | |
941 | thread_db_find_new_threads (void) | |
942 | { | |
943 | td_err_e err; | |
944 | ||
945 | /* Iterate over all user-space threads to discover new threads. */ | |
946 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, | |
947 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
948 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
949 | if (err != TD_OK) | |
950 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
951 | } | |
952 | ||
953 | static char * | |
39f77062 | 954 | thread_db_pid_to_str (ptid_t ptid) |
fb0e1ba7 | 955 | { |
39f77062 | 956 | if (is_thread (ptid)) |
fb0e1ba7 MK |
957 | { |
958 | static char buf[64]; | |
959 | td_thrhandle_t th; | |
960 | td_thrinfo_t ti; | |
961 | td_err_e err; | |
962 | ||
39f77062 | 963 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th); |
fb0e1ba7 MK |
964 | if (err != TD_OK) |
965 | error ("Cannot find thread %ld: %s", | |
39f77062 | 966 | (long) GET_THREAD (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
967 | |
968 | err = td_thr_get_info_p (&th, &ti); | |
969 | if (err != TD_OK) | |
970 | error ("Cannot get thread info for thread %ld: %s", | |
39f77062 | 971 | (long) GET_THREAD (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
972 | |
973 | if (ti.ti_state == TD_THR_ACTIVE && ti.ti_lid != 0) | |
974 | { | |
975 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", | |
976 | (long) ti.ti_tid, ti.ti_lid); | |
977 | } | |
978 | else | |
979 | { | |
980 | snprintf (buf, sizeof (buf), "Thread %ld (%s)", | |
981 | (long) ti.ti_tid, thread_db_state_str (ti.ti_state)); | |
982 | } | |
983 | ||
984 | return buf; | |
985 | } | |
986 | ||
39f77062 KB |
987 | if (target_beneath->to_pid_to_str (ptid)) |
988 | return target_beneath->to_pid_to_str (ptid); | |
fb0e1ba7 | 989 | |
39f77062 | 990 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
991 | } |
992 | ||
993 | static void | |
994 | init_thread_db_ops (void) | |
995 | { | |
996 | thread_db_ops.to_shortname = "multi-thread"; | |
997 | thread_db_ops.to_longname = "multi-threaded child process."; | |
998 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
999 | thread_db_ops.to_detach = thread_db_detach; | |
1000 | thread_db_ops.to_resume = thread_db_resume; | |
1001 | thread_db_ops.to_wait = thread_db_wait; | |
1002 | thread_db_ops.to_fetch_registers = thread_db_fetch_registers; | |
1003 | thread_db_ops.to_store_registers = thread_db_store_registers; | |
1004 | thread_db_ops.to_xfer_memory = thread_db_xfer_memory; | |
1005 | thread_db_ops.to_kill = thread_db_kill; | |
1006 | thread_db_ops.to_create_inferior = thread_db_create_inferior; | |
bda9cb72 | 1007 | thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior; |
fb0e1ba7 MK |
1008 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
1009 | thread_db_ops.to_thread_alive = thread_db_thread_alive; | |
1010 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; | |
1011 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1012 | thread_db_ops.to_stratum = thread_stratum; | |
1013 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
1014 | thread_db_ops.to_magic = OPS_MAGIC; | |
1015 | } | |
1016 | ||
1017 | void | |
1018 | _initialize_thread_db (void) | |
1019 | { | |
1020 | /* Only initialize the module if we can load libthread_db. */ | |
1021 | if (thread_db_load ()) | |
1022 | { | |
1023 | init_thread_db_ops (); | |
1024 | add_target (&thread_db_ops); | |
1025 | ||
1026 | /* Add ourselves to objfile event chain. */ | |
540af400 | 1027 | target_new_objfile_chain = target_new_objfile_hook; |
fb0e1ba7 MK |
1028 | target_new_objfile_hook = thread_db_new_objfile; |
1029 | } | |
1030 | } |