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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 | ||
c194fbe1 MK |
59 | /* Non-zero if we have to keep this module's target vector active |
60 | across re-runs. */ | |
bda9cb72 MK |
61 | static int keep_thread_db; |
62 | ||
fb0e1ba7 MK |
63 | /* Non-zero if we have determined the signals used by the threads |
64 | library. */ | |
65 | static int thread_signals; | |
66 | static sigset_t thread_stop_set; | |
67 | static sigset_t thread_print_set; | |
68 | ||
69 | /* Structure that identifies the child process for the | |
70 | <proc_service.h> interface. */ | |
71 | static struct ps_prochandle proc_handle; | |
72 | ||
73 | /* Connection to the libthread_db library. */ | |
74 | static td_thragent_t *thread_agent; | |
75 | ||
76 | /* Pointers to the libthread_db functions. */ | |
77 | ||
78 | static td_err_e (*td_init_p) (void); | |
79 | ||
80 | static td_err_e (*td_ta_new_p) (struct ps_prochandle *ps, td_thragent_t **ta); | |
81 | static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, | |
82 | td_thrhandle_t *__th); | |
83 | static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, | |
84 | td_thrhandle_t *th); | |
85 | static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
86 | td_thr_iter_f *callback, | |
87 | void *cbdata_p, td_thr_state_e state, | |
88 | int ti_pri, sigset_t *ti_sigmask_p, | |
89 | unsigned int ti_user_flags); | |
90 | static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
91 | td_event_e event, td_notify_t *ptr); | |
92 | static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
93 | td_thr_events_t *event); | |
94 | static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
95 | td_event_msg_t *msg); | |
96 | ||
97 | static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
98 | static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
99 | td_thrinfo_t *infop); | |
100 | static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th, | |
101 | gdb_prfpregset_t *regset); | |
102 | static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th, | |
103 | prgregset_t gregs); | |
104 | static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th, | |
105 | const gdb_prfpregset_t *fpregs); | |
106 | static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th, | |
107 | prgregset_t gregs); | |
108 | static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); | |
109 | ||
110 | /* Location of the thread creation event breakpoint. The code at this | |
111 | location in the child process will be called by the pthread library | |
112 | whenever a new thread is created. By setting a special breakpoint | |
113 | at this location, GDB can detect when a new thread is created. We | |
114 | obtain this location via the td_ta_event_addr call. */ | |
115 | static CORE_ADDR td_create_bp_addr; | |
116 | ||
117 | /* Location of the thread death event breakpoint. */ | |
118 | static CORE_ADDR td_death_bp_addr; | |
119 | ||
120 | /* Prototypes for local functions. */ | |
bda9cb72 | 121 | static void thread_db_find_new_threads (void); |
fb0e1ba7 MK |
122 | \f |
123 | ||
124 | /* Building process ids. */ | |
125 | ||
ca6724c1 KB |
126 | #define GET_PID(ptid) ptid_get_pid (ptid) |
127 | #define GET_LWP(ptid) ptid_get_lwp (ptid) | |
128 | #define GET_THREAD(ptid) ptid_get_tid (ptid) | |
fb0e1ba7 | 129 | |
ca6724c1 KB |
130 | #define is_lwp(ptid) (GET_LWP (ptid) != 0) |
131 | #define is_thread(ptid) (GET_THREAD (ptid) != 0) | |
fb0e1ba7 | 132 | |
ca6724c1 KB |
133 | #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) |
134 | #define BUILD_THREAD(tid, pid) ptid_build (pid, 0, tid) | |
fb0e1ba7 MK |
135 | \f |
136 | ||
137 | struct private_thread_info | |
138 | { | |
139 | /* Cached LWP id. Must come first, see lin-lwp.c. */ | |
140 | lwpid_t lwpid; | |
141 | }; | |
fb0e1ba7 | 142 | \f |
21bf60fe | 143 | |
fb0e1ba7 MK |
144 | static char * |
145 | thread_db_err_str (td_err_e err) | |
146 | { | |
147 | static char buf[64]; | |
148 | ||
149 | switch (err) | |
150 | { | |
151 | case TD_OK: | |
152 | return "generic 'call succeeded'"; | |
153 | case TD_ERR: | |
154 | return "generic error"; | |
155 | case TD_NOTHR: | |
156 | return "no thread to satisfy query"; | |
157 | case TD_NOSV: | |
158 | return "no sync handle to satisfy query"; | |
159 | case TD_NOLWP: | |
160 | return "no LWP to satisfy query"; | |
161 | case TD_BADPH: | |
162 | return "invalid process handle"; | |
163 | case TD_BADTH: | |
164 | return "invalid thread handle"; | |
165 | case TD_BADSH: | |
166 | return "invalid synchronization handle"; | |
167 | case TD_BADTA: | |
168 | return "invalid thread agent"; | |
169 | case TD_BADKEY: | |
170 | return "invalid key"; | |
171 | case TD_NOMSG: | |
172 | return "no event message for getmsg"; | |
173 | case TD_NOFPREGS: | |
174 | return "FPU register set not available"; | |
175 | case TD_NOLIBTHREAD: | |
176 | return "application not linked with libthread"; | |
177 | case TD_NOEVENT: | |
178 | return "requested event is not supported"; | |
179 | case TD_NOCAPAB: | |
180 | return "capability not available"; | |
181 | case TD_DBERR: | |
182 | return "debugger service failed"; | |
183 | case TD_NOAPLIC: | |
184 | return "operation not applicable to"; | |
185 | case TD_NOTSD: | |
186 | return "no thread-specific data for this thread"; | |
187 | case TD_MALLOC: | |
188 | return "malloc failed"; | |
189 | case TD_PARTIALREG: | |
190 | return "only part of register set was written/read"; | |
191 | case TD_NOXREGS: | |
192 | return "X register set not available for this thread"; | |
193 | default: | |
194 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
195 | return buf; | |
196 | } | |
197 | } | |
198 | ||
199 | static char * | |
200 | thread_db_state_str (td_thr_state_e state) | |
201 | { | |
202 | static char buf[64]; | |
203 | ||
204 | switch (state) | |
205 | { | |
206 | case TD_THR_STOPPED: | |
207 | return "stopped by debugger"; | |
208 | case TD_THR_RUN: | |
209 | return "runnable"; | |
210 | case TD_THR_ACTIVE: | |
211 | return "active"; | |
212 | case TD_THR_ZOMBIE: | |
213 | return "zombie"; | |
214 | case TD_THR_SLEEP: | |
215 | return "sleeping"; | |
216 | case TD_THR_STOPPED_ASLEEP: | |
217 | return "stopped by debugger AND blocked"; | |
218 | default: | |
219 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
220 | return buf; | |
221 | } | |
222 | } | |
223 | \f | |
224 | ||
225 | /* Convert between user-level thread ids and LWP ids. */ | |
226 | ||
39f77062 KB |
227 | static ptid_t |
228 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 MK |
229 | { |
230 | td_thrinfo_t ti; | |
231 | td_thrhandle_t th; | |
232 | td_err_e err; | |
233 | ||
39f77062 KB |
234 | if (GET_LWP (ptid) == 0) |
235 | ptid = BUILD_LWP (GET_PID (ptid), GET_PID (ptid)); | |
fb0e1ba7 | 236 | |
39f77062 | 237 | gdb_assert (is_lwp (ptid)); |
fb0e1ba7 | 238 | |
39f77062 | 239 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); |
fb0e1ba7 MK |
240 | if (err != TD_OK) |
241 | error ("Cannot find user-level thread for LWP %d: %s", | |
39f77062 | 242 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
243 | |
244 | err = td_thr_get_info_p (&th, &ti); | |
245 | if (err != TD_OK) | |
246 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
247 | ||
39f77062 | 248 | return BUILD_THREAD (ti.ti_tid, GET_PID (ptid)); |
fb0e1ba7 MK |
249 | } |
250 | ||
39f77062 KB |
251 | static ptid_t |
252 | lwp_from_thread (ptid_t ptid) | |
fb0e1ba7 MK |
253 | { |
254 | td_thrinfo_t ti; | |
255 | td_thrhandle_t th; | |
256 | td_err_e err; | |
257 | ||
21bf60fe | 258 | if (!is_thread (ptid)) |
39f77062 | 259 | return ptid; |
fb0e1ba7 | 260 | |
39f77062 | 261 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th); |
fb0e1ba7 MK |
262 | if (err != TD_OK) |
263 | error ("Cannot find thread %ld: %s", | |
39f77062 | 264 | (long) GET_THREAD (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
265 | |
266 | err = td_thr_get_info_p (&th, &ti); | |
267 | if (err != TD_OK) | |
268 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
269 | ||
39f77062 | 270 | return BUILD_LWP (ti.ti_lid, GET_PID (ptid)); |
fb0e1ba7 MK |
271 | } |
272 | \f | |
273 | ||
274 | void | |
275 | thread_db_init (struct target_ops *target) | |
276 | { | |
277 | target_beneath = target; | |
278 | } | |
279 | ||
280 | static int | |
281 | thread_db_load (void) | |
282 | { | |
283 | void *handle; | |
284 | td_err_e err; | |
285 | ||
286 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); | |
287 | if (handle == NULL) | |
288 | return 0; | |
289 | ||
290 | /* Initialize pointers to the dynamic library functions we will use. | |
291 | Essential functions first. */ | |
292 | ||
293 | td_init_p = dlsym (handle, "td_init"); | |
294 | if (td_init_p == NULL) | |
295 | return 0; | |
296 | ||
297 | td_ta_new_p = dlsym (handle, "td_ta_new"); | |
298 | if (td_ta_new_p == NULL) | |
299 | return 0; | |
300 | ||
301 | td_ta_map_id2thr_p = dlsym (handle, "td_ta_map_id2thr"); | |
302 | if (td_ta_map_id2thr_p == NULL) | |
303 | return 0; | |
304 | ||
305 | td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr"); | |
306 | if (td_ta_map_lwp2thr_p == NULL) | |
307 | return 0; | |
308 | ||
309 | td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter"); | |
310 | if (td_ta_thr_iter_p == NULL) | |
311 | return 0; | |
312 | ||
313 | td_thr_validate_p = dlsym (handle, "td_thr_validate"); | |
314 | if (td_thr_validate_p == NULL) | |
315 | return 0; | |
316 | ||
317 | td_thr_get_info_p = dlsym (handle, "td_thr_get_info"); | |
318 | if (td_thr_get_info_p == NULL) | |
319 | return 0; | |
320 | ||
321 | td_thr_getfpregs_p = dlsym (handle, "td_thr_getfpregs"); | |
322 | if (td_thr_getfpregs_p == NULL) | |
323 | return 0; | |
324 | ||
325 | td_thr_getgregs_p = dlsym (handle, "td_thr_getgregs"); | |
326 | if (td_thr_getgregs_p == NULL) | |
327 | return 0; | |
328 | ||
329 | td_thr_setfpregs_p = dlsym (handle, "td_thr_setfpregs"); | |
330 | if (td_thr_setfpregs_p == NULL) | |
331 | return 0; | |
332 | ||
333 | td_thr_setgregs_p = dlsym (handle, "td_thr_setgregs"); | |
334 | if (td_thr_setgregs_p == NULL) | |
335 | return 0; | |
336 | ||
337 | /* Initialize the library. */ | |
338 | err = td_init_p (); | |
339 | if (err != TD_OK) | |
340 | { | |
341 | warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err)); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | /* These are not essential. */ | |
346 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); | |
347 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); | |
348 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); | |
349 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); | |
350 | ||
351 | return 1; | |
352 | } | |
353 | ||
354 | static void | |
355 | enable_thread_event_reporting (void) | |
356 | { | |
357 | td_thr_events_t events; | |
358 | td_notify_t notify; | |
359 | td_err_e err; | |
360 | ||
361 | /* We cannot use the thread event reporting facility if these | |
362 | functions aren't available. */ | |
363 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL | |
364 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) | |
365 | return; | |
366 | ||
367 | /* Set the process wide mask saying which events we're interested in. */ | |
368 | td_event_emptyset (&events); | |
369 | td_event_addset (&events, TD_CREATE); | |
370 | #if 0 | |
371 | /* FIXME: kettenis/2000-04-23: The event reporting facility is | |
372 | broken for TD_DEATH events in glibc 2.1.3, so don't enable it for | |
373 | now. */ | |
374 | td_event_addset (&events, TD_DEATH); | |
375 | #endif | |
376 | ||
377 | err = td_ta_set_event_p (thread_agent, &events); | |
378 | if (err != TD_OK) | |
379 | { | |
380 | warning ("Unable to set global thread event mask: %s", | |
381 | thread_db_err_str (err)); | |
382 | return; | |
383 | } | |
384 | ||
385 | /* Delete previous thread event breakpoints, if any. */ | |
386 | remove_thread_event_breakpoints (); | |
387 | ||
388 | /* Get address for thread creation breakpoint. */ | |
389 | err = td_ta_event_addr_p (thread_agent, TD_CREATE, ¬ify); | |
390 | if (err != TD_OK) | |
391 | { | |
392 | warning ("Unable to get location for thread creation breakpoint: %s", | |
393 | thread_db_err_str (err)); | |
394 | return; | |
395 | } | |
396 | ||
397 | /* Set up the breakpoint. */ | |
398 | td_create_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
399 | create_thread_event_breakpoint (td_create_bp_addr); | |
400 | ||
401 | /* Get address for thread death breakpoint. */ | |
402 | err = td_ta_event_addr_p (thread_agent, TD_DEATH, ¬ify); | |
403 | if (err != TD_OK) | |
404 | { | |
936742ab | 405 | warning ("Unable to get location for thread death breakpoint: %s", |
fb0e1ba7 MK |
406 | thread_db_err_str (err)); |
407 | return; | |
408 | } | |
409 | ||
410 | /* Set up the breakpoint. */ | |
411 | td_death_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
412 | create_thread_event_breakpoint (td_death_bp_addr); | |
413 | } | |
414 | ||
415 | static void | |
416 | disable_thread_event_reporting (void) | |
417 | { | |
418 | td_thr_events_t events; | |
419 | ||
420 | /* Set the process wide mask saying we aren't interested in any | |
421 | events anymore. */ | |
422 | td_event_emptyset (&events); | |
423 | td_ta_set_event_p (thread_agent, &events); | |
424 | ||
425 | /* Delete thread event breakpoints, if any. */ | |
426 | remove_thread_event_breakpoints (); | |
427 | td_create_bp_addr = 0; | |
428 | td_death_bp_addr = 0; | |
429 | } | |
430 | ||
431 | static void | |
432 | check_thread_signals (void) | |
433 | { | |
434 | #ifdef GET_THREAD_SIGNALS | |
21bf60fe | 435 | if (!thread_signals) |
fb0e1ba7 MK |
436 | { |
437 | sigset_t mask; | |
438 | int i; | |
439 | ||
440 | GET_THREAD_SIGNALS (&mask); | |
441 | sigemptyset (&thread_stop_set); | |
442 | sigemptyset (&thread_print_set); | |
443 | ||
b9569773 | 444 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
445 | { |
446 | if (sigismember (&mask, i)) | |
447 | { | |
448 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
449 | sigaddset (&thread_stop_set, i); | |
450 | if (signal_print_update (target_signal_from_host (i), 0)) | |
451 | sigaddset (&thread_print_set, i); | |
452 | thread_signals = 1; | |
453 | } | |
454 | } | |
455 | } | |
456 | #endif | |
457 | } | |
458 | ||
459 | static void | |
460 | disable_thread_signals (void) | |
461 | { | |
462 | #ifdef GET_THREAD_SIGNALS | |
463 | if (thread_signals) | |
464 | { | |
465 | int i; | |
466 | ||
b9569773 | 467 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
468 | { |
469 | if (sigismember (&thread_stop_set, i)) | |
470 | signal_stop_update (target_signal_from_host (i), 1); | |
471 | if (sigismember (&thread_print_set, i)) | |
472 | signal_print_update (target_signal_from_host (i), 1); | |
473 | } | |
474 | ||
475 | thread_signals = 0; | |
476 | } | |
477 | #endif | |
478 | } | |
479 | ||
fb0e1ba7 MK |
480 | static void |
481 | thread_db_new_objfile (struct objfile *objfile) | |
482 | { | |
483 | td_err_e err; | |
484 | ||
bda9cb72 MK |
485 | if (objfile == NULL) |
486 | { | |
487 | /* All symbols have been discarded. If the thread_db target is | |
c194fbe1 | 488 | active, deactivate it now. */ |
bda9cb72 | 489 | if (using_thread_db) |
c194fbe1 MK |
490 | { |
491 | gdb_assert (proc_handle.pid == 0); | |
492 | unpush_target (&thread_db_ops); | |
493 | using_thread_db = 0; | |
494 | } | |
495 | ||
496 | keep_thread_db = 0; | |
bda9cb72 MK |
497 | |
498 | goto quit; | |
499 | } | |
500 | ||
fb0e1ba7 MK |
501 | if (using_thread_db) |
502 | /* Nothing to do. The thread library was already detected and the | |
503 | target vector was already activated. */ | |
504 | goto quit; | |
505 | ||
bda9cb72 MK |
506 | /* Initialize the structure that identifies the child process. Note |
507 | that at this point there is no guarantee that we actually have a | |
508 | child process. */ | |
39f77062 | 509 | proc_handle.pid = GET_PID (inferior_ptid); |
fb0e1ba7 | 510 | |
bda9cb72 | 511 | /* Now attempt to open a connection to the thread library. */ |
fb0e1ba7 MK |
512 | err = td_ta_new_p (&proc_handle, &thread_agent); |
513 | switch (err) | |
514 | { | |
515 | case TD_NOLIBTHREAD: | |
bda9cb72 | 516 | /* No thread library was detected. */ |
fb0e1ba7 MK |
517 | break; |
518 | ||
519 | case TD_OK: | |
bda9cb72 MK |
520 | /* The thread library was detected. Activate the thread_db target. */ |
521 | push_target (&thread_db_ops); | |
522 | using_thread_db = 1; | |
523 | ||
524 | /* If the thread library was detected in the main symbol file | |
525 | itself, we assume that the program was statically linked | |
526 | against the thread library and well have to keep this | |
527 | module's target vector activated until forever... Well, at | |
528 | least until all symbols have been discarded anyway (see | |
529 | above). */ | |
530 | if (objfile == symfile_objfile) | |
531 | { | |
532 | gdb_assert (proc_handle.pid == 0); | |
533 | keep_thread_db = 1; | |
534 | } | |
535 | ||
536 | /* We can only poke around if there actually is a child process. | |
537 | If there is no child process alive, postpone the steps below | |
538 | until one has been created. */ | |
539 | if (proc_handle.pid != 0) | |
540 | { | |
541 | enable_thread_event_reporting (); | |
542 | thread_db_find_new_threads (); | |
543 | } | |
fb0e1ba7 MK |
544 | break; |
545 | ||
546 | default: | |
547 | warning ("Cannot initialize thread debugging library: %s", | |
548 | thread_db_err_str (err)); | |
549 | break; | |
550 | } | |
551 | ||
552 | quit: | |
540af400 MS |
553 | if (target_new_objfile_chain) |
554 | target_new_objfile_chain (objfile); | |
fb0e1ba7 MK |
555 | } |
556 | ||
557 | static void | |
39f77062 | 558 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
fb0e1ba7 MK |
559 | const td_thrinfo_t *ti_p, int verbose) |
560 | { | |
561 | struct thread_info *tp; | |
562 | td_err_e err; | |
563 | ||
564 | check_thread_signals (); | |
565 | ||
566 | if (verbose) | |
39f77062 | 567 | printf_unfiltered ("[New %s]\n", target_pid_to_str (ptid)); |
fb0e1ba7 MK |
568 | |
569 | /* Add the thread to GDB's thread list. */ | |
39f77062 | 570 | tp = add_thread (ptid); |
fb0e1ba7 MK |
571 | tp->private = xmalloc (sizeof (struct private_thread_info)); |
572 | tp->private->lwpid = ti_p->ti_lid; | |
573 | ||
21bf60fe MK |
574 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
575 | return; /* A zombie thread -- do not attach. */ | |
5fd913cc | 576 | |
fb0e1ba7 MK |
577 | /* Under Linux, we have to attach to each and every thread. */ |
578 | #ifdef ATTACH_LWP | |
c194fbe1 | 579 | ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0); |
fb0e1ba7 MK |
580 | #endif |
581 | ||
582 | /* Enable thread event reporting for this thread. */ | |
583 | err = td_thr_event_enable_p (th_p, 1); | |
584 | if (err != TD_OK) | |
585 | error ("Cannot enable thread event reporting for %s: %s", | |
39f77062 | 586 | target_pid_to_str (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
587 | } |
588 | ||
c194fbe1 MK |
589 | static void |
590 | thread_db_attach (char *args, int from_tty) | |
591 | { | |
592 | target_beneath->to_attach (args, from_tty); | |
593 | ||
594 | /* Destroy thread info; it's no longer valid. */ | |
595 | init_thread_list (); | |
596 | ||
597 | /* The child process is now the actual multi-threaded | |
598 | program. Snatch its process ID... */ | |
599 | proc_handle.pid = GET_PID (inferior_ptid); | |
600 | ||
601 | /* ...and perform the remaining initialization steps. */ | |
602 | enable_thread_event_reporting (); | |
603 | thread_db_find_new_threads(); | |
604 | } | |
605 | ||
fb0e1ba7 | 606 | static void |
39f77062 | 607 | detach_thread (ptid_t ptid, int verbose) |
fb0e1ba7 MK |
608 | { |
609 | if (verbose) | |
39f77062 | 610 | printf_unfiltered ("[%s exited]\n", target_pid_to_str (ptid)); |
fb0e1ba7 MK |
611 | } |
612 | ||
613 | static void | |
614 | thread_db_detach (char *args, int from_tty) | |
615 | { | |
616 | disable_thread_event_reporting (); | |
c194fbe1 MK |
617 | |
618 | /* There's no need to save & restore inferior_ptid here, since the | |
619 | inferior is supposed to be survive this function call. */ | |
620 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
621 | ||
622 | /* Forget about the child's process ID. We shouldn't need it | |
623 | anymore. */ | |
624 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
625 | |
626 | target_beneath->to_detach (args, from_tty); | |
627 | } | |
628 | ||
629 | static void | |
39f77062 | 630 | thread_db_resume (ptid_t ptid, int step, enum target_signal signo) |
fb0e1ba7 | 631 | { |
39f77062 | 632 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 | 633 | |
39f77062 KB |
634 | if (GET_PID (ptid) == -1) |
635 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
636 | else if (is_thread (ptid)) | |
637 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 638 | |
39f77062 | 639 | target_beneath->to_resume (ptid, step, signo); |
fb0e1ba7 MK |
640 | |
641 | do_cleanups (old_chain); | |
642 | } | |
643 | ||
644 | /* Check if PID is currently stopped at the location of a thread event | |
645 | breakpoint location. If it is, read the event message and act upon | |
646 | the event. */ | |
647 | ||
648 | static void | |
39f77062 | 649 | check_event (ptid_t ptid) |
fb0e1ba7 MK |
650 | { |
651 | td_event_msg_t msg; | |
652 | td_thrinfo_t ti; | |
653 | td_err_e err; | |
654 | CORE_ADDR stop_pc; | |
655 | ||
656 | /* Bail out early if we're not at a thread event breakpoint. */ | |
39f77062 | 657 | stop_pc = read_pc_pid (ptid) - DECR_PC_AFTER_BREAK; |
fb0e1ba7 MK |
658 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) |
659 | return; | |
660 | ||
661 | err = td_ta_event_getmsg_p (thread_agent, &msg); | |
662 | if (err != TD_OK) | |
663 | { | |
664 | if (err == TD_NOMSG) | |
665 | return; | |
666 | ||
667 | error ("Cannot get thread event message: %s", thread_db_err_str (err)); | |
668 | } | |
669 | ||
670 | err = td_thr_get_info_p (msg.th_p, &ti); | |
671 | if (err != TD_OK) | |
672 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
673 | ||
39f77062 | 674 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (ptid)); |
fb0e1ba7 MK |
675 | |
676 | switch (msg.event) | |
677 | { | |
678 | case TD_CREATE: | |
679 | #if 0 | |
680 | /* FIXME: kettenis/2000-08-26: Since we use td_ta_event_getmsg, | |
681 | there is no guarantee that the breakpoint will match the | |
682 | event. Should we use td_thr_event_getmsg instead? */ | |
683 | ||
684 | if (stop_pc != td_create_bp_addr) | |
685 | error ("Thread creation event doesn't match breakpoint."); | |
686 | #endif | |
687 | ||
540af400 MS |
688 | /* We may already know about this thread, for instance when the |
689 | user has issued the `info threads' command before the SIGTRAP | |
690 | for hitting the thread creation breakpoint was reported. */ | |
21bf60fe | 691 | if (!in_thread_list (ptid)) |
39f77062 | 692 | attach_thread (ptid, msg.th_p, &ti, 1); |
fb0e1ba7 MK |
693 | return; |
694 | ||
695 | case TD_DEATH: | |
696 | #if 0 | |
697 | /* FIXME: See TD_CREATE. */ | |
698 | ||
699 | if (stop_pc != td_death_bp_addr) | |
700 | error ("Thread death event doesn't match breakpoint."); | |
701 | #endif | |
702 | ||
21bf60fe | 703 | if (!in_thread_list (ptid)) |
fb0e1ba7 MK |
704 | error ("Spurious thread death event."); |
705 | ||
39f77062 | 706 | detach_thread (ptid, 1); |
fb0e1ba7 MK |
707 | return; |
708 | ||
709 | default: | |
710 | error ("Spurious thread event."); | |
711 | } | |
712 | } | |
713 | ||
39f77062 KB |
714 | static ptid_t |
715 | thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
fb0e1ba7 | 716 | { |
39f77062 | 717 | extern ptid_t trap_ptid; |
fb0e1ba7 | 718 | |
39f77062 KB |
719 | if (GET_PID (ptid) != -1 && is_thread (ptid)) |
720 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 721 | |
39f77062 | 722 | ptid = target_beneath->to_wait (ptid, ourstatus); |
fb0e1ba7 | 723 | |
bda9cb72 MK |
724 | if (proc_handle.pid == 0) |
725 | /* The current child process isn't the actual multi-threaded | |
726 | program yet, so don't try to do any special thread-specific | |
727 | post-processing and bail out early. */ | |
39f77062 | 728 | return ptid; |
bda9cb72 | 729 | |
fb0e1ba7 | 730 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
39f77062 | 731 | return pid_to_ptid (-1); |
fb0e1ba7 MK |
732 | |
733 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED | |
734 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
735 | /* Check for a thread event. */ | |
39f77062 | 736 | check_event (ptid); |
fb0e1ba7 | 737 | |
39f77062 KB |
738 | if (!ptid_equal (trap_ptid, null_ptid)) |
739 | trap_ptid = thread_from_lwp (trap_ptid); | |
fb0e1ba7 | 740 | |
39f77062 | 741 | return thread_from_lwp (ptid); |
fb0e1ba7 MK |
742 | } |
743 | ||
744 | static int | |
745 | thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
e5da8f38 | 746 | struct mem_attrib *attrib, |
fb0e1ba7 MK |
747 | struct target_ops *target) |
748 | { | |
39f77062 | 749 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 MK |
750 | int xfer; |
751 | ||
39f77062 | 752 | if (is_thread (inferior_ptid)) |
fb0e1ba7 MK |
753 | { |
754 | /* FIXME: This seems to be necessary to make sure breakpoints | |
755 | are removed. */ | |
21bf60fe | 756 | if (!target_thread_alive (inferior_ptid)) |
39f77062 | 757 | inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); |
fb0e1ba7 | 758 | else |
39f77062 | 759 | inferior_ptid = lwp_from_thread (inferior_ptid); |
fb0e1ba7 MK |
760 | } |
761 | ||
e5da8f38 | 762 | xfer = target_beneath->to_xfer_memory (memaddr, myaddr, len, write, attrib, target); |
fb0e1ba7 MK |
763 | |
764 | do_cleanups (old_chain); | |
765 | return xfer; | |
766 | } | |
767 | ||
768 | static void | |
769 | thread_db_fetch_registers (int regno) | |
770 | { | |
771 | td_thrhandle_t th; | |
772 | prgregset_t gregset; | |
773 | gdb_prfpregset_t fpregset; | |
774 | td_err_e err; | |
775 | ||
21bf60fe | 776 | if (!is_thread (inferior_ptid)) |
fb0e1ba7 MK |
777 | { |
778 | /* Pass the request to the target beneath us. */ | |
779 | target_beneath->to_fetch_registers (regno); | |
780 | return; | |
781 | } | |
782 | ||
39f77062 | 783 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_ptid), &th); |
fb0e1ba7 MK |
784 | if (err != TD_OK) |
785 | error ("Cannot find thread %ld: %s", | |
39f77062 | 786 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
787 | |
788 | err = td_thr_getgregs_p (&th, gregset); | |
789 | if (err != TD_OK) | |
790 | error ("Cannot fetch general-purpose registers for thread %ld: %s", | |
39f77062 | 791 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
792 | |
793 | err = td_thr_getfpregs_p (&th, &fpregset); | |
794 | if (err != TD_OK) | |
795 | error ("Cannot get floating-point registers for thread %ld: %s", | |
39f77062 | 796 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
797 | |
798 | /* Note that we must call supply_gregset after calling the thread_db | |
799 | routines because the thread_db routines call ps_lgetgregs and | |
800 | friends which clobber GDB's register cache. */ | |
801 | supply_gregset ((gdb_gregset_t *) gregset); | |
802 | supply_fpregset (&fpregset); | |
803 | } | |
804 | ||
805 | static void | |
806 | thread_db_store_registers (int regno) | |
807 | { | |
808 | td_thrhandle_t th; | |
809 | prgregset_t gregset; | |
810 | gdb_prfpregset_t fpregset; | |
811 | td_err_e err; | |
812 | ||
21bf60fe | 813 | if (!is_thread (inferior_ptid)) |
fb0e1ba7 MK |
814 | { |
815 | /* Pass the request to the target beneath us. */ | |
816 | target_beneath->to_store_registers (regno); | |
817 | return; | |
818 | } | |
819 | ||
39f77062 | 820 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_ptid), &th); |
fb0e1ba7 MK |
821 | if (err != TD_OK) |
822 | error ("Cannot find thread %ld: %s", | |
39f77062 | 823 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
824 | |
825 | if (regno != -1) | |
826 | { | |
827 | char raw[MAX_REGISTER_RAW_SIZE]; | |
828 | ||
829 | read_register_gen (regno, raw); | |
830 | thread_db_fetch_registers (-1); | |
831 | supply_register (regno, raw); | |
832 | } | |
833 | ||
834 | fill_gregset ((gdb_gregset_t *) gregset, -1); | |
835 | fill_fpregset (&fpregset, -1); | |
836 | ||
837 | err = td_thr_setgregs_p (&th, gregset); | |
838 | if (err != TD_OK) | |
839 | error ("Cannot store general-purpose registers for thread %ld: %s", | |
39f77062 | 840 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
841 | err = td_thr_setfpregs_p (&th, &fpregset); |
842 | if (err != TD_OK) | |
843 | error ("Cannot store floating-point registers for thread %ld: %s", | |
39f77062 | 844 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
845 | } |
846 | ||
847 | static void | |
848 | thread_db_kill (void) | |
849 | { | |
c194fbe1 MK |
850 | /* There's no need to save & restore inferior_ptid here, since the |
851 | inferior isn't supposed to survive this function call. */ | |
852 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
fb0e1ba7 MK |
853 | target_beneath->to_kill (); |
854 | } | |
855 | ||
856 | static void | |
857 | thread_db_create_inferior (char *exec_file, char *allargs, char **env) | |
858 | { | |
21bf60fe | 859 | if (!keep_thread_db) |
c194fbe1 MK |
860 | { |
861 | unpush_target (&thread_db_ops); | |
862 | using_thread_db = 0; | |
863 | } | |
864 | ||
bda9cb72 MK |
865 | target_beneath->to_create_inferior (exec_file, allargs, env); |
866 | } | |
fb0e1ba7 | 867 | |
bda9cb72 | 868 | static void |
39f77062 | 869 | thread_db_post_startup_inferior (ptid_t ptid) |
bda9cb72 MK |
870 | { |
871 | if (proc_handle.pid == 0) | |
872 | { | |
873 | /* The child process is now the actual multi-threaded | |
874 | program. Snatch its process ID... */ | |
39f77062 | 875 | proc_handle.pid = GET_PID (ptid); |
fb0e1ba7 | 876 | |
bda9cb72 MK |
877 | /* ...and perform the remaining initialization steps. */ |
878 | enable_thread_event_reporting (); | |
21bf60fe | 879 | thread_db_find_new_threads (); |
bda9cb72 | 880 | } |
fb0e1ba7 MK |
881 | } |
882 | ||
883 | static void | |
884 | thread_db_mourn_inferior (void) | |
885 | { | |
886 | remove_thread_event_breakpoints (); | |
c194fbe1 MK |
887 | |
888 | /* Forget about the child's process ID. We shouldn't need it | |
889 | anymore. */ | |
890 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
891 | |
892 | target_beneath->to_mourn_inferior (); | |
893 | } | |
894 | ||
895 | static int | |
39f77062 | 896 | thread_db_thread_alive (ptid_t ptid) |
fb0e1ba7 | 897 | { |
5fd913cc | 898 | td_thrhandle_t th; |
21bf60fe MK |
899 | td_thrinfo_t ti; |
900 | td_err_e err; | |
5fd913cc | 901 | |
39f77062 | 902 | if (is_thread (ptid)) |
fb0e1ba7 | 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 | ||
5fd913cc MS |
912 | err = td_thr_get_info_p (&th, &ti); |
913 | if (err != TD_OK) | |
914 | return 0; | |
915 | ||
21bf60fe MK |
916 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
917 | return 0; /* A zombie thread. */ | |
5fd913cc | 918 | |
fb0e1ba7 MK |
919 | return 1; |
920 | } | |
921 | ||
922 | if (target_beneath->to_thread_alive) | |
39f77062 | 923 | return target_beneath->to_thread_alive (ptid); |
fb0e1ba7 MK |
924 | |
925 | return 0; | |
926 | } | |
927 | ||
928 | static int | |
929 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
930 | { | |
931 | td_thrinfo_t ti; | |
932 | td_err_e err; | |
39f77062 | 933 | ptid_t ptid; |
fb0e1ba7 MK |
934 | |
935 | err = td_thr_get_info_p (th_p, &ti); | |
936 | if (err != TD_OK) | |
937 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
938 | ||
21bf60fe MK |
939 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
940 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 941 | |
39f77062 | 942 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid)); |
fb0e1ba7 | 943 | |
21bf60fe | 944 | if (!in_thread_list (ptid)) |
39f77062 | 945 | attach_thread (ptid, th_p, &ti, 1); |
fb0e1ba7 MK |
946 | |
947 | return 0; | |
948 | } | |
949 | ||
950 | static void | |
951 | thread_db_find_new_threads (void) | |
952 | { | |
953 | td_err_e err; | |
954 | ||
955 | /* Iterate over all user-space threads to discover new threads. */ | |
956 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, | |
957 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
958 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
959 | if (err != TD_OK) | |
960 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
961 | } | |
962 | ||
963 | static char * | |
39f77062 | 964 | thread_db_pid_to_str (ptid_t ptid) |
fb0e1ba7 | 965 | { |
39f77062 | 966 | if (is_thread (ptid)) |
fb0e1ba7 MK |
967 | { |
968 | static char buf[64]; | |
969 | td_thrhandle_t th; | |
970 | td_thrinfo_t ti; | |
971 | td_err_e err; | |
972 | ||
39f77062 | 973 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th); |
fb0e1ba7 MK |
974 | if (err != TD_OK) |
975 | error ("Cannot find thread %ld: %s", | |
39f77062 | 976 | (long) GET_THREAD (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
977 | |
978 | err = td_thr_get_info_p (&th, &ti); | |
979 | if (err != TD_OK) | |
980 | error ("Cannot get thread info for thread %ld: %s", | |
39f77062 | 981 | (long) GET_THREAD (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
982 | |
983 | if (ti.ti_state == TD_THR_ACTIVE && ti.ti_lid != 0) | |
984 | { | |
985 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", | |
986 | (long) ti.ti_tid, ti.ti_lid); | |
987 | } | |
988 | else | |
989 | { | |
990 | snprintf (buf, sizeof (buf), "Thread %ld (%s)", | |
991 | (long) ti.ti_tid, thread_db_state_str (ti.ti_state)); | |
992 | } | |
993 | ||
994 | return buf; | |
995 | } | |
996 | ||
39f77062 KB |
997 | if (target_beneath->to_pid_to_str (ptid)) |
998 | return target_beneath->to_pid_to_str (ptid); | |
fb0e1ba7 | 999 | |
39f77062 | 1000 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1001 | } |
1002 | ||
1003 | static void | |
1004 | init_thread_db_ops (void) | |
1005 | { | |
1006 | thread_db_ops.to_shortname = "multi-thread"; | |
1007 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1008 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
c194fbe1 | 1009 | thread_db_ops.to_attach = thread_db_attach; |
fb0e1ba7 MK |
1010 | thread_db_ops.to_detach = thread_db_detach; |
1011 | thread_db_ops.to_resume = thread_db_resume; | |
1012 | thread_db_ops.to_wait = thread_db_wait; | |
1013 | thread_db_ops.to_fetch_registers = thread_db_fetch_registers; | |
1014 | thread_db_ops.to_store_registers = thread_db_store_registers; | |
1015 | thread_db_ops.to_xfer_memory = thread_db_xfer_memory; | |
1016 | thread_db_ops.to_kill = thread_db_kill; | |
1017 | thread_db_ops.to_create_inferior = thread_db_create_inferior; | |
bda9cb72 | 1018 | thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior; |
fb0e1ba7 MK |
1019 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
1020 | thread_db_ops.to_thread_alive = thread_db_thread_alive; | |
1021 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; | |
1022 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1023 | thread_db_ops.to_stratum = thread_stratum; | |
1024 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
1025 | thread_db_ops.to_magic = OPS_MAGIC; | |
1026 | } | |
1027 | ||
1028 | void | |
1029 | _initialize_thread_db (void) | |
1030 | { | |
1031 | /* Only initialize the module if we can load libthread_db. */ | |
1032 | if (thread_db_load ()) | |
1033 | { | |
1034 | init_thread_db_ops (); | |
1035 | add_target (&thread_db_ops); | |
1036 | ||
1037 | /* Add ourselves to objfile event chain. */ | |
540af400 | 1038 | target_new_objfile_chain = target_new_objfile_hook; |
fb0e1ba7 MK |
1039 | target_new_objfile_hook = thread_db_new_objfile; |
1040 | } | |
1041 | } |