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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b AC |
2 | |
3 | Copyright 1999, 2000, 2001, 2003 Free Software Foundation, Inc. | |
fb0e1ba7 MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | ||
24 | #include "gdb_assert.h" | |
25 | #include <dlfcn.h> | |
26 | #include "gdb_proc_service.h" | |
27 | #include "gdb_thread_db.h" | |
28 | ||
bda9cb72 | 29 | #include "bfd.h" |
fb0e1ba7 MK |
30 | #include "gdbthread.h" |
31 | #include "inferior.h" | |
bda9cb72 MK |
32 | #include "symfile.h" |
33 | #include "objfiles.h" | |
fb0e1ba7 | 34 | #include "target.h" |
4e052eda | 35 | #include "regcache.h" |
3f47be5c | 36 | #include "solib-svr4.h" |
fb0e1ba7 MK |
37 | |
38 | #ifndef LIBTHREAD_DB_SO | |
39 | #define LIBTHREAD_DB_SO "libthread_db.so.1" | |
40 | #endif | |
41 | ||
8605d56e AC |
42 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
43 | threads. */ | |
fb0e1ba7 MK |
44 | |
45 | /* FIXME: There is certainly some room for improvements: | |
46 | - Cache LWP ids. | |
47 | - Bypass libthread_db when fetching or storing registers for | |
48 | threads bound to a LWP. */ | |
49 | ||
50 | /* This module's target vector. */ | |
51 | static struct target_ops thread_db_ops; | |
52 | ||
53 | /* The target vector that we call for things this module can't handle. */ | |
54 | static struct target_ops *target_beneath; | |
55 | ||
56 | /* Pointer to the next function on the objfile event chain. */ | |
b4acd559 | 57 | static void (*target_new_objfile_chain) (struct objfile * objfile); |
fb0e1ba7 MK |
58 | |
59 | /* Non-zero if we're using this module's target vector. */ | |
60 | static int using_thread_db; | |
61 | ||
c194fbe1 MK |
62 | /* Non-zero if we have to keep this module's target vector active |
63 | across re-runs. */ | |
bda9cb72 MK |
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 | ||
b4acd559 JJ |
83 | static td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
84 | td_thragent_t **ta); | |
fb0e1ba7 MK |
85 | static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
86 | td_thrhandle_t *__th); | |
b4acd559 JJ |
87 | static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, |
88 | lwpid_t lwpid, td_thrhandle_t *th); | |
fb0e1ba7 | 89 | static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, |
b4acd559 JJ |
90 | td_thr_iter_f *callback, void *cbdata_p, |
91 | td_thr_state_e state, int ti_pri, | |
92 | sigset_t *ti_sigmask_p, | |
fb0e1ba7 MK |
93 | unsigned int ti_user_flags); |
94 | static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
95 | td_event_e event, td_notify_t *ptr); | |
96 | static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
97 | td_thr_events_t *event); | |
98 | static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
99 | td_event_msg_t *msg); | |
100 | ||
101 | static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
102 | static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
103 | td_thrinfo_t *infop); | |
104 | static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th, | |
105 | gdb_prfpregset_t *regset); | |
106 | static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th, | |
107 | prgregset_t gregs); | |
108 | static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th, | |
109 | const gdb_prfpregset_t *fpregs); | |
110 | static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th, | |
111 | prgregset_t gregs); | |
b4acd559 JJ |
112 | static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, |
113 | int event); | |
fb0e1ba7 | 114 | |
3f47be5c | 115 | static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, |
b4acd559 JJ |
116 | void *map_address, |
117 | size_t offset, void **address); | |
3f47be5c | 118 | |
fb0e1ba7 MK |
119 | /* Location of the thread creation event breakpoint. The code at this |
120 | location in the child process will be called by the pthread library | |
121 | whenever a new thread is created. By setting a special breakpoint | |
122 | at this location, GDB can detect when a new thread is created. We | |
123 | obtain this location via the td_ta_event_addr call. */ | |
124 | static CORE_ADDR td_create_bp_addr; | |
125 | ||
126 | /* Location of the thread death event breakpoint. */ | |
127 | static CORE_ADDR td_death_bp_addr; | |
128 | ||
129 | /* Prototypes for local functions. */ | |
bda9cb72 | 130 | static void thread_db_find_new_threads (void); |
5365276c DJ |
131 | static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
132 | const td_thrinfo_t *ti_p, int verbose); | |
fb0e1ba7 MK |
133 | \f |
134 | ||
135 | /* Building process ids. */ | |
136 | ||
ca6724c1 KB |
137 | #define GET_PID(ptid) ptid_get_pid (ptid) |
138 | #define GET_LWP(ptid) ptid_get_lwp (ptid) | |
139 | #define GET_THREAD(ptid) ptid_get_tid (ptid) | |
fb0e1ba7 | 140 | |
ca6724c1 KB |
141 | #define is_lwp(ptid) (GET_LWP (ptid) != 0) |
142 | #define is_thread(ptid) (GET_THREAD (ptid) != 0) | |
fb0e1ba7 | 143 | |
ca6724c1 KB |
144 | #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) |
145 | #define BUILD_THREAD(tid, pid) ptid_build (pid, 0, tid) | |
fb0e1ba7 MK |
146 | \f |
147 | ||
5365276c DJ |
148 | /* Use "struct private_thread_info" to cache thread state. This is |
149 | a substantial optimization. */ | |
150 | ||
fb0e1ba7 MK |
151 | struct private_thread_info |
152 | { | |
5365276c | 153 | /* Cached thread state. */ |
b4acd559 JJ |
154 | unsigned int th_valid:1; |
155 | unsigned int ti_valid:1; | |
5365276c DJ |
156 | |
157 | td_thrhandle_t th; | |
158 | td_thrinfo_t ti; | |
fb0e1ba7 | 159 | }; |
fb0e1ba7 | 160 | \f |
21bf60fe | 161 | |
fb0e1ba7 MK |
162 | static char * |
163 | thread_db_err_str (td_err_e err) | |
164 | { | |
165 | static char buf[64]; | |
166 | ||
167 | switch (err) | |
168 | { | |
169 | case TD_OK: | |
170 | return "generic 'call succeeded'"; | |
171 | case TD_ERR: | |
172 | return "generic error"; | |
173 | case TD_NOTHR: | |
174 | return "no thread to satisfy query"; | |
175 | case TD_NOSV: | |
176 | return "no sync handle to satisfy query"; | |
177 | case TD_NOLWP: | |
178 | return "no LWP to satisfy query"; | |
179 | case TD_BADPH: | |
180 | return "invalid process handle"; | |
181 | case TD_BADTH: | |
182 | return "invalid thread handle"; | |
183 | case TD_BADSH: | |
184 | return "invalid synchronization handle"; | |
185 | case TD_BADTA: | |
186 | return "invalid thread agent"; | |
187 | case TD_BADKEY: | |
188 | return "invalid key"; | |
189 | case TD_NOMSG: | |
190 | return "no event message for getmsg"; | |
191 | case TD_NOFPREGS: | |
192 | return "FPU register set not available"; | |
193 | case TD_NOLIBTHREAD: | |
194 | return "application not linked with libthread"; | |
195 | case TD_NOEVENT: | |
196 | return "requested event is not supported"; | |
197 | case TD_NOCAPAB: | |
198 | return "capability not available"; | |
199 | case TD_DBERR: | |
200 | return "debugger service failed"; | |
201 | case TD_NOAPLIC: | |
202 | return "operation not applicable to"; | |
203 | case TD_NOTSD: | |
204 | return "no thread-specific data for this thread"; | |
205 | case TD_MALLOC: | |
206 | return "malloc failed"; | |
207 | case TD_PARTIALREG: | |
208 | return "only part of register set was written/read"; | |
209 | case TD_NOXREGS: | |
210 | return "X register set not available for this thread"; | |
211 | default: | |
212 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
213 | return buf; | |
214 | } | |
215 | } | |
216 | ||
217 | static char * | |
218 | thread_db_state_str (td_thr_state_e state) | |
219 | { | |
220 | static char buf[64]; | |
221 | ||
222 | switch (state) | |
223 | { | |
224 | case TD_THR_STOPPED: | |
225 | return "stopped by debugger"; | |
226 | case TD_THR_RUN: | |
227 | return "runnable"; | |
228 | case TD_THR_ACTIVE: | |
229 | return "active"; | |
230 | case TD_THR_ZOMBIE: | |
231 | return "zombie"; | |
232 | case TD_THR_SLEEP: | |
233 | return "sleeping"; | |
234 | case TD_THR_STOPPED_ASLEEP: | |
235 | return "stopped by debugger AND blocked"; | |
236 | default: | |
237 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
238 | return buf; | |
239 | } | |
240 | } | |
241 | \f | |
5365276c DJ |
242 | /* A callback function for td_ta_thr_iter, which we use to map all |
243 | threads to LWPs. | |
244 | ||
245 | THP is a handle to the current thread; if INFOP is not NULL, the | |
246 | struct thread_info associated with this thread is returned in | |
247 | *INFOP. */ | |
248 | ||
249 | static int | |
250 | thread_get_info_callback (const td_thrhandle_t *thp, void *infop) | |
251 | { | |
252 | td_thrinfo_t ti; | |
253 | td_err_e err; | |
254 | struct thread_info *thread_info; | |
255 | ptid_t thread_ptid; | |
256 | ||
257 | err = td_thr_get_info_p (thp, &ti); | |
258 | if (err != TD_OK) | |
b4acd559 | 259 | error ("thread_get_info_callback: cannot get thread info: %s", |
5365276c DJ |
260 | thread_db_err_str (err)); |
261 | ||
262 | /* Fill the cache. */ | |
263 | thread_ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid)); | |
264 | thread_info = find_thread_pid (thread_ptid); | |
265 | ||
266 | if (thread_info == NULL) | |
267 | { | |
268 | /* New thread. Attach to it now (why wait?). */ | |
269 | attach_thread (thread_ptid, thp, &ti, 1); | |
270 | thread_info = find_thread_pid (thread_ptid); | |
271 | gdb_assert (thread_info != NULL); | |
272 | } | |
273 | ||
274 | memcpy (&thread_info->private->th, thp, sizeof (*thp)); | |
275 | thread_info->private->th_valid = 1; | |
276 | memcpy (&thread_info->private->ti, &ti, sizeof (ti)); | |
277 | thread_info->private->ti_valid = 1; | |
278 | ||
279 | if (infop != NULL) | |
280 | *(struct thread_info **) infop = thread_info; | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | /* Accessor functions for the thread_db information, with caching. */ | |
fb0e1ba7 | 286 | |
5365276c DJ |
287 | static void |
288 | thread_db_map_id2thr (struct thread_info *thread_info, int fatal) | |
289 | { | |
290 | td_err_e err; | |
291 | ||
292 | if (thread_info->private->th_valid) | |
293 | return; | |
294 | ||
295 | err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (thread_info->ptid), | |
296 | &thread_info->private->th); | |
297 | if (err != TD_OK) | |
298 | { | |
299 | if (fatal) | |
300 | error ("Cannot find thread %ld: %s", | |
b4acd559 JJ |
301 | (long) GET_THREAD (thread_info->ptid), |
302 | thread_db_err_str (err)); | |
5365276c DJ |
303 | } |
304 | else | |
305 | thread_info->private->th_valid = 1; | |
306 | } | |
307 | ||
308 | static td_thrinfo_t * | |
309 | thread_db_get_info (struct thread_info *thread_info) | |
310 | { | |
311 | td_err_e err; | |
312 | ||
313 | if (thread_info->private->ti_valid) | |
314 | return &thread_info->private->ti; | |
315 | ||
b4acd559 | 316 | if (!thread_info->private->th_valid) |
5365276c DJ |
317 | thread_db_map_id2thr (thread_info, 1); |
318 | ||
b4acd559 JJ |
319 | err = |
320 | td_thr_get_info_p (&thread_info->private->th, &thread_info->private->ti); | |
5365276c | 321 | if (err != TD_OK) |
b4acd559 | 322 | error ("thread_db_get_info: cannot get thread info: %s", |
5365276c DJ |
323 | thread_db_err_str (err)); |
324 | ||
325 | thread_info->private->ti_valid = 1; | |
326 | return &thread_info->private->ti; | |
327 | } | |
328 | \f | |
fb0e1ba7 MK |
329 | /* Convert between user-level thread ids and LWP ids. */ |
330 | ||
39f77062 KB |
331 | static ptid_t |
332 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 | 333 | { |
fb0e1ba7 MK |
334 | td_thrhandle_t th; |
335 | td_err_e err; | |
5365276c DJ |
336 | struct thread_info *thread_info; |
337 | ptid_t thread_ptid; | |
fb0e1ba7 | 338 | |
39f77062 KB |
339 | if (GET_LWP (ptid) == 0) |
340 | ptid = BUILD_LWP (GET_PID (ptid), GET_PID (ptid)); | |
fb0e1ba7 | 341 | |
39f77062 | 342 | gdb_assert (is_lwp (ptid)); |
fb0e1ba7 | 343 | |
39f77062 | 344 | err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); |
fb0e1ba7 | 345 | if (err != TD_OK) |
823ca731 | 346 | error ("Cannot find user-level thread for LWP %ld: %s", |
39f77062 | 347 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 348 | |
5365276c DJ |
349 | thread_info = NULL; |
350 | thread_get_info_callback (&th, &thread_info); | |
351 | gdb_assert (thread_info && thread_info->private->ti_valid); | |
fb0e1ba7 | 352 | |
5365276c | 353 | return BUILD_THREAD (thread_info->private->ti.ti_tid, GET_PID (ptid)); |
fb0e1ba7 MK |
354 | } |
355 | ||
39f77062 KB |
356 | static ptid_t |
357 | lwp_from_thread (ptid_t ptid) | |
fb0e1ba7 | 358 | { |
5365276c DJ |
359 | struct thread_info *thread_info; |
360 | ptid_t thread_ptid; | |
fb0e1ba7 | 361 | |
21bf60fe | 362 | if (!is_thread (ptid)) |
39f77062 | 363 | return ptid; |
fb0e1ba7 | 364 | |
5365276c DJ |
365 | thread_info = find_thread_pid (ptid); |
366 | thread_db_get_info (thread_info); | |
fb0e1ba7 | 367 | |
5365276c | 368 | return BUILD_LWP (thread_info->private->ti.ti_lid, GET_PID (ptid)); |
fb0e1ba7 MK |
369 | } |
370 | \f | |
371 | ||
372 | void | |
373 | thread_db_init (struct target_ops *target) | |
374 | { | |
375 | target_beneath = target; | |
376 | } | |
377 | ||
5220ea4c AC |
378 | static void * |
379 | verbose_dlsym (void *handle, const char *name) | |
380 | { | |
381 | void *sym = dlsym (handle, name); | |
382 | if (sym == NULL) | |
383 | warning ("Symbol \"%s\" not found in libthread_db: %s", name, dlerror ()); | |
384 | return sym; | |
385 | } | |
386 | ||
fb0e1ba7 MK |
387 | static int |
388 | thread_db_load (void) | |
389 | { | |
390 | void *handle; | |
391 | td_err_e err; | |
392 | ||
393 | handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); | |
394 | if (handle == NULL) | |
f7c1e0f3 | 395 | { |
b4acd559 | 396 | fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n", |
f7c1e0f3 | 397 | LIBTHREAD_DB_SO, dlerror ()); |
b4acd559 | 398 | fprintf_filtered (gdb_stderr, |
f7c1e0f3 MS |
399 | "GDB will not be able to debug pthreads.\n\n"); |
400 | return 0; | |
401 | } | |
fb0e1ba7 MK |
402 | |
403 | /* Initialize pointers to the dynamic library functions we will use. | |
404 | Essential functions first. */ | |
405 | ||
5220ea4c | 406 | td_init_p = verbose_dlsym (handle, "td_init"); |
fb0e1ba7 MK |
407 | if (td_init_p == NULL) |
408 | return 0; | |
409 | ||
5220ea4c | 410 | td_ta_new_p = verbose_dlsym (handle, "td_ta_new"); |
fb0e1ba7 MK |
411 | if (td_ta_new_p == NULL) |
412 | return 0; | |
413 | ||
5220ea4c | 414 | td_ta_map_id2thr_p = verbose_dlsym (handle, "td_ta_map_id2thr"); |
fb0e1ba7 MK |
415 | if (td_ta_map_id2thr_p == NULL) |
416 | return 0; | |
417 | ||
5220ea4c | 418 | td_ta_map_lwp2thr_p = verbose_dlsym (handle, "td_ta_map_lwp2thr"); |
fb0e1ba7 MK |
419 | if (td_ta_map_lwp2thr_p == NULL) |
420 | return 0; | |
421 | ||
5220ea4c | 422 | td_ta_thr_iter_p = verbose_dlsym (handle, "td_ta_thr_iter"); |
fb0e1ba7 MK |
423 | if (td_ta_thr_iter_p == NULL) |
424 | return 0; | |
425 | ||
5220ea4c | 426 | td_thr_validate_p = verbose_dlsym (handle, "td_thr_validate"); |
fb0e1ba7 MK |
427 | if (td_thr_validate_p == NULL) |
428 | return 0; | |
429 | ||
5220ea4c | 430 | td_thr_get_info_p = verbose_dlsym (handle, "td_thr_get_info"); |
fb0e1ba7 MK |
431 | if (td_thr_get_info_p == NULL) |
432 | return 0; | |
433 | ||
5220ea4c | 434 | td_thr_getfpregs_p = verbose_dlsym (handle, "td_thr_getfpregs"); |
fb0e1ba7 MK |
435 | if (td_thr_getfpregs_p == NULL) |
436 | return 0; | |
437 | ||
5220ea4c | 438 | td_thr_getgregs_p = verbose_dlsym (handle, "td_thr_getgregs"); |
fb0e1ba7 MK |
439 | if (td_thr_getgregs_p == NULL) |
440 | return 0; | |
441 | ||
5220ea4c | 442 | td_thr_setfpregs_p = verbose_dlsym (handle, "td_thr_setfpregs"); |
fb0e1ba7 MK |
443 | if (td_thr_setfpregs_p == NULL) |
444 | return 0; | |
445 | ||
5220ea4c | 446 | td_thr_setgregs_p = verbose_dlsym (handle, "td_thr_setgregs"); |
fb0e1ba7 MK |
447 | if (td_thr_setgregs_p == NULL) |
448 | return 0; | |
449 | ||
450 | /* Initialize the library. */ | |
451 | err = td_init_p (); | |
452 | if (err != TD_OK) | |
453 | { | |
454 | warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err)); | |
455 | return 0; | |
456 | } | |
457 | ||
458 | /* These are not essential. */ | |
459 | td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); | |
460 | td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); | |
461 | td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); | |
462 | td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); | |
3f47be5c | 463 | td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"); |
fb0e1ba7 MK |
464 | |
465 | return 1; | |
466 | } | |
467 | ||
468 | static void | |
469 | enable_thread_event_reporting (void) | |
470 | { | |
471 | td_thr_events_t events; | |
472 | td_notify_t notify; | |
473 | td_err_e err; | |
474 | ||
475 | /* We cannot use the thread event reporting facility if these | |
476 | functions aren't available. */ | |
477 | if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL | |
478 | || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) | |
479 | return; | |
480 | ||
481 | /* Set the process wide mask saying which events we're interested in. */ | |
482 | td_event_emptyset (&events); | |
483 | td_event_addset (&events, TD_CREATE); | |
484 | #if 0 | |
485 | /* FIXME: kettenis/2000-04-23: The event reporting facility is | |
486 | broken for TD_DEATH events in glibc 2.1.3, so don't enable it for | |
487 | now. */ | |
488 | td_event_addset (&events, TD_DEATH); | |
489 | #endif | |
490 | ||
491 | err = td_ta_set_event_p (thread_agent, &events); | |
492 | if (err != TD_OK) | |
493 | { | |
494 | warning ("Unable to set global thread event mask: %s", | |
495 | thread_db_err_str (err)); | |
496 | return; | |
497 | } | |
498 | ||
499 | /* Delete previous thread event breakpoints, if any. */ | |
500 | remove_thread_event_breakpoints (); | |
501 | ||
502 | /* Get address for thread creation breakpoint. */ | |
503 | err = td_ta_event_addr_p (thread_agent, TD_CREATE, ¬ify); | |
504 | if (err != TD_OK) | |
505 | { | |
506 | warning ("Unable to get location for thread creation breakpoint: %s", | |
507 | thread_db_err_str (err)); | |
508 | return; | |
509 | } | |
510 | ||
511 | /* Set up the breakpoint. */ | |
512 | td_create_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
513 | create_thread_event_breakpoint (td_create_bp_addr); | |
514 | ||
515 | /* Get address for thread death breakpoint. */ | |
516 | err = td_ta_event_addr_p (thread_agent, TD_DEATH, ¬ify); | |
517 | if (err != TD_OK) | |
518 | { | |
936742ab | 519 | warning ("Unable to get location for thread death breakpoint: %s", |
fb0e1ba7 MK |
520 | thread_db_err_str (err)); |
521 | return; | |
522 | } | |
523 | ||
524 | /* Set up the breakpoint. */ | |
525 | td_death_bp_addr = (CORE_ADDR) notify.u.bptaddr; | |
526 | create_thread_event_breakpoint (td_death_bp_addr); | |
527 | } | |
528 | ||
529 | static void | |
530 | disable_thread_event_reporting (void) | |
531 | { | |
532 | td_thr_events_t events; | |
533 | ||
534 | /* Set the process wide mask saying we aren't interested in any | |
535 | events anymore. */ | |
536 | td_event_emptyset (&events); | |
537 | td_ta_set_event_p (thread_agent, &events); | |
538 | ||
539 | /* Delete thread event breakpoints, if any. */ | |
540 | remove_thread_event_breakpoints (); | |
541 | td_create_bp_addr = 0; | |
542 | td_death_bp_addr = 0; | |
543 | } | |
544 | ||
545 | static void | |
546 | check_thread_signals (void) | |
547 | { | |
548 | #ifdef GET_THREAD_SIGNALS | |
21bf60fe | 549 | if (!thread_signals) |
fb0e1ba7 MK |
550 | { |
551 | sigset_t mask; | |
552 | int i; | |
553 | ||
554 | GET_THREAD_SIGNALS (&mask); | |
555 | sigemptyset (&thread_stop_set); | |
556 | sigemptyset (&thread_print_set); | |
557 | ||
b9569773 | 558 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
559 | { |
560 | if (sigismember (&mask, i)) | |
561 | { | |
562 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
563 | sigaddset (&thread_stop_set, i); | |
564 | if (signal_print_update (target_signal_from_host (i), 0)) | |
565 | sigaddset (&thread_print_set, i); | |
566 | thread_signals = 1; | |
567 | } | |
568 | } | |
569 | } | |
570 | #endif | |
571 | } | |
572 | ||
573 | static void | |
574 | disable_thread_signals (void) | |
575 | { | |
576 | #ifdef GET_THREAD_SIGNALS | |
577 | if (thread_signals) | |
578 | { | |
579 | int i; | |
580 | ||
b9569773 | 581 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
582 | { |
583 | if (sigismember (&thread_stop_set, i)) | |
584 | signal_stop_update (target_signal_from_host (i), 1); | |
585 | if (sigismember (&thread_print_set, i)) | |
586 | signal_print_update (target_signal_from_host (i), 1); | |
587 | } | |
588 | ||
589 | thread_signals = 0; | |
590 | } | |
591 | #endif | |
592 | } | |
593 | ||
fb0e1ba7 MK |
594 | static void |
595 | thread_db_new_objfile (struct objfile *objfile) | |
596 | { | |
597 | td_err_e err; | |
598 | ||
5220ea4c AC |
599 | /* First time through, report that libthread_db was successfuly |
600 | loaded. Can't print this in in thread_db_load as, at that stage, | |
601 | the interpreter and it's console haven't started. The real | |
602 | problem here is that libthread_db is loaded too early - it should | |
603 | only be loaded when there is a program to debug. */ | |
604 | { | |
605 | static int dejavu; | |
606 | if (!dejavu) | |
607 | { | |
608 | Dl_info info; | |
609 | const char *library = NULL; | |
610 | /* Try dladdr. */ | |
611 | if (dladdr ((*td_ta_new_p), &info) != 0) | |
612 | library = info.dli_fname; | |
613 | /* Try dlinfo? */ | |
614 | if (library == NULL) | |
615 | /* Paranoid - don't let a NULL path slip through. */ | |
616 | library = LIBTHREAD_DB_SO; | |
617 | printf_unfiltered ("Using host libthread_db library \"%s\".\n", | |
618 | library); | |
619 | dejavu = 1; | |
620 | } | |
621 | } | |
622 | ||
5bbd998e MS |
623 | /* Don't attempt to use thread_db on targets which can not run |
624 | (core files). */ | |
625 | if (objfile == NULL || !target_has_execution) | |
bda9cb72 MK |
626 | { |
627 | /* All symbols have been discarded. If the thread_db target is | |
c194fbe1 | 628 | active, deactivate it now. */ |
bda9cb72 | 629 | if (using_thread_db) |
c194fbe1 MK |
630 | { |
631 | gdb_assert (proc_handle.pid == 0); | |
632 | unpush_target (&thread_db_ops); | |
633 | using_thread_db = 0; | |
634 | } | |
635 | ||
636 | keep_thread_db = 0; | |
bda9cb72 MK |
637 | |
638 | goto quit; | |
639 | } | |
640 | ||
fb0e1ba7 MK |
641 | if (using_thread_db) |
642 | /* Nothing to do. The thread library was already detected and the | |
643 | target vector was already activated. */ | |
644 | goto quit; | |
645 | ||
bda9cb72 MK |
646 | /* Initialize the structure that identifies the child process. Note |
647 | that at this point there is no guarantee that we actually have a | |
648 | child process. */ | |
39f77062 | 649 | proc_handle.pid = GET_PID (inferior_ptid); |
fb0e1ba7 | 650 | |
bda9cb72 | 651 | /* Now attempt to open a connection to the thread library. */ |
fb0e1ba7 MK |
652 | err = td_ta_new_p (&proc_handle, &thread_agent); |
653 | switch (err) | |
654 | { | |
655 | case TD_NOLIBTHREAD: | |
bda9cb72 | 656 | /* No thread library was detected. */ |
fb0e1ba7 MK |
657 | break; |
658 | ||
659 | case TD_OK: | |
5220ea4c AC |
660 | printf_unfiltered ("[Thread debugging using libthread_db enabled]\n"); |
661 | ||
bda9cb72 MK |
662 | /* The thread library was detected. Activate the thread_db target. */ |
663 | push_target (&thread_db_ops); | |
664 | using_thread_db = 1; | |
665 | ||
666 | /* If the thread library was detected in the main symbol file | |
667 | itself, we assume that the program was statically linked | |
668 | against the thread library and well have to keep this | |
669 | module's target vector activated until forever... Well, at | |
670 | least until all symbols have been discarded anyway (see | |
671 | above). */ | |
672 | if (objfile == symfile_objfile) | |
673 | { | |
674 | gdb_assert (proc_handle.pid == 0); | |
675 | keep_thread_db = 1; | |
676 | } | |
677 | ||
678 | /* We can only poke around if there actually is a child process. | |
679 | If there is no child process alive, postpone the steps below | |
680 | until one has been created. */ | |
681 | if (proc_handle.pid != 0) | |
682 | { | |
683 | enable_thread_event_reporting (); | |
684 | thread_db_find_new_threads (); | |
685 | } | |
fb0e1ba7 MK |
686 | break; |
687 | ||
688 | default: | |
689 | warning ("Cannot initialize thread debugging library: %s", | |
690 | thread_db_err_str (err)); | |
691 | break; | |
692 | } | |
693 | ||
b4acd559 | 694 | quit: |
540af400 MS |
695 | if (target_new_objfile_chain) |
696 | target_new_objfile_chain (objfile); | |
fb0e1ba7 MK |
697 | } |
698 | ||
699 | static void | |
39f77062 | 700 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
fb0e1ba7 MK |
701 | const td_thrinfo_t *ti_p, int verbose) |
702 | { | |
703 | struct thread_info *tp; | |
704 | td_err_e err; | |
705 | ||
706 | check_thread_signals (); | |
707 | ||
fb0e1ba7 | 708 | /* Add the thread to GDB's thread list. */ |
39f77062 | 709 | tp = add_thread (ptid); |
fb0e1ba7 | 710 | tp->private = xmalloc (sizeof (struct private_thread_info)); |
5365276c DJ |
711 | memset (tp->private, 0, sizeof (struct private_thread_info)); |
712 | ||
713 | if (verbose) | |
714 | printf_unfiltered ("[New %s]\n", target_pid_to_str (ptid)); | |
fb0e1ba7 | 715 | |
21bf60fe MK |
716 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
717 | return; /* A zombie thread -- do not attach. */ | |
5fd913cc | 718 | |
8605d56e | 719 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
fb0e1ba7 | 720 | #ifdef ATTACH_LWP |
c194fbe1 | 721 | ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0); |
fb0e1ba7 MK |
722 | #endif |
723 | ||
724 | /* Enable thread event reporting for this thread. */ | |
725 | err = td_thr_event_enable_p (th_p, 1); | |
726 | if (err != TD_OK) | |
727 | error ("Cannot enable thread event reporting for %s: %s", | |
39f77062 | 728 | target_pid_to_str (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
729 | } |
730 | ||
c194fbe1 MK |
731 | static void |
732 | thread_db_attach (char *args, int from_tty) | |
733 | { | |
734 | target_beneath->to_attach (args, from_tty); | |
735 | ||
736 | /* Destroy thread info; it's no longer valid. */ | |
737 | init_thread_list (); | |
738 | ||
739 | /* The child process is now the actual multi-threaded | |
740 | program. Snatch its process ID... */ | |
741 | proc_handle.pid = GET_PID (inferior_ptid); | |
742 | ||
743 | /* ...and perform the remaining initialization steps. */ | |
744 | enable_thread_event_reporting (); | |
b4acd559 | 745 | thread_db_find_new_threads (); |
c194fbe1 MK |
746 | } |
747 | ||
fb0e1ba7 | 748 | static void |
39f77062 | 749 | detach_thread (ptid_t ptid, int verbose) |
fb0e1ba7 MK |
750 | { |
751 | if (verbose) | |
39f77062 | 752 | printf_unfiltered ("[%s exited]\n", target_pid_to_str (ptid)); |
fb0e1ba7 MK |
753 | } |
754 | ||
755 | static void | |
756 | thread_db_detach (char *args, int from_tty) | |
757 | { | |
758 | disable_thread_event_reporting (); | |
c194fbe1 MK |
759 | |
760 | /* There's no need to save & restore inferior_ptid here, since the | |
761 | inferior is supposed to be survive this function call. */ | |
762 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
763 | ||
764 | /* Forget about the child's process ID. We shouldn't need it | |
765 | anymore. */ | |
766 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
767 | |
768 | target_beneath->to_detach (args, from_tty); | |
769 | } | |
770 | ||
5365276c DJ |
771 | static int |
772 | clear_lwpid_callback (struct thread_info *thread, void *dummy) | |
773 | { | |
774 | /* If we know that our thread implementation is 1-to-1, we could save | |
775 | a certain amount of information; it's not clear how much, so we | |
776 | are always conservative. */ | |
777 | ||
778 | thread->private->th_valid = 0; | |
779 | thread->private->ti_valid = 0; | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
fb0e1ba7 | 784 | static void |
39f77062 | 785 | thread_db_resume (ptid_t ptid, int step, enum target_signal signo) |
fb0e1ba7 | 786 | { |
39f77062 | 787 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 | 788 | |
39f77062 KB |
789 | if (GET_PID (ptid) == -1) |
790 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
791 | else if (is_thread (ptid)) | |
792 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 793 | |
5365276c DJ |
794 | /* Clear cached data which may not be valid after the resume. */ |
795 | iterate_over_threads (clear_lwpid_callback, NULL); | |
796 | ||
39f77062 | 797 | target_beneath->to_resume (ptid, step, signo); |
fb0e1ba7 MK |
798 | |
799 | do_cleanups (old_chain); | |
800 | } | |
801 | ||
802 | /* Check if PID is currently stopped at the location of a thread event | |
803 | breakpoint location. If it is, read the event message and act upon | |
804 | the event. */ | |
805 | ||
806 | static void | |
39f77062 | 807 | check_event (ptid_t ptid) |
fb0e1ba7 MK |
808 | { |
809 | td_event_msg_t msg; | |
810 | td_thrinfo_t ti; | |
811 | td_err_e err; | |
812 | CORE_ADDR stop_pc; | |
4d9850d3 | 813 | int loop = 0; |
fb0e1ba7 MK |
814 | |
815 | /* Bail out early if we're not at a thread event breakpoint. */ | |
39f77062 | 816 | stop_pc = read_pc_pid (ptid) - DECR_PC_AFTER_BREAK; |
fb0e1ba7 MK |
817 | if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) |
818 | return; | |
819 | ||
4d9850d3 JJ |
820 | /* If we are at a create breakpoint, we do not know what new lwp |
821 | was created and cannot specifically locate the event message for it. | |
822 | We have to call td_ta_event_getmsg() to get | |
823 | the latest message. Since we have no way of correlating whether | |
824 | the event message we get back corresponds to our breakpoint, we must | |
825 | loop and read all event messages, processing them appropriately. | |
826 | This guarantees we will process the correct message before continuing | |
827 | from the breakpoint. | |
828 | ||
829 | Currently, death events are not enabled. If they are enabled, | |
830 | the death event can use the td_thr_event_getmsg() interface to | |
831 | get the message specifically for that lwp and avoid looping | |
832 | below. */ | |
833 | ||
834 | loop = 1; | |
835 | ||
836 | do | |
fb0e1ba7 | 837 | { |
4d9850d3 JJ |
838 | err = td_ta_event_getmsg_p (thread_agent, &msg); |
839 | if (err != TD_OK) | |
840 | { | |
841 | if (err == TD_NOMSG) | |
842 | return; | |
fb0e1ba7 | 843 | |
4d9850d3 JJ |
844 | error ("Cannot get thread event message: %s", |
845 | thread_db_err_str (err)); | |
846 | } | |
fb0e1ba7 | 847 | |
4d9850d3 JJ |
848 | err = td_thr_get_info_p (msg.th_p, &ti); |
849 | if (err != TD_OK) | |
850 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
fb0e1ba7 | 851 | |
4d9850d3 | 852 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (ptid)); |
fb0e1ba7 | 853 | |
4d9850d3 JJ |
854 | switch (msg.event) |
855 | { | |
856 | case TD_CREATE: | |
fb0e1ba7 | 857 | |
4d9850d3 JJ |
858 | /* We may already know about this thread, for instance when the |
859 | user has issued the `info threads' command before the SIGTRAP | |
860 | for hitting the thread creation breakpoint was reported. */ | |
861 | if (!in_thread_list (ptid)) | |
862 | attach_thread (ptid, msg.th_p, &ti, 1); | |
fb0e1ba7 | 863 | |
4d9850d3 | 864 | break; |
fb0e1ba7 | 865 | |
4d9850d3 | 866 | case TD_DEATH: |
fb0e1ba7 | 867 | |
4d9850d3 JJ |
868 | if (!in_thread_list (ptid)) |
869 | error ("Spurious thread death event."); | |
fb0e1ba7 | 870 | |
4d9850d3 | 871 | detach_thread (ptid, 1); |
fb0e1ba7 | 872 | |
4d9850d3 | 873 | break; |
fb0e1ba7 | 874 | |
4d9850d3 JJ |
875 | default: |
876 | error ("Spurious thread event."); | |
877 | } | |
fb0e1ba7 | 878 | } |
4d9850d3 | 879 | while (loop); |
fb0e1ba7 MK |
880 | } |
881 | ||
39f77062 KB |
882 | static ptid_t |
883 | thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
fb0e1ba7 | 884 | { |
39f77062 | 885 | extern ptid_t trap_ptid; |
fb0e1ba7 | 886 | |
39f77062 KB |
887 | if (GET_PID (ptid) != -1 && is_thread (ptid)) |
888 | ptid = lwp_from_thread (ptid); | |
fb0e1ba7 | 889 | |
39f77062 | 890 | ptid = target_beneath->to_wait (ptid, ourstatus); |
fb0e1ba7 | 891 | |
bda9cb72 MK |
892 | if (proc_handle.pid == 0) |
893 | /* The current child process isn't the actual multi-threaded | |
894 | program yet, so don't try to do any special thread-specific | |
895 | post-processing and bail out early. */ | |
39f77062 | 896 | return ptid; |
bda9cb72 | 897 | |
fb0e1ba7 | 898 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
39f77062 | 899 | return pid_to_ptid (-1); |
fb0e1ba7 MK |
900 | |
901 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED | |
902 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
903 | /* Check for a thread event. */ | |
39f77062 | 904 | check_event (ptid); |
fb0e1ba7 | 905 | |
39f77062 KB |
906 | if (!ptid_equal (trap_ptid, null_ptid)) |
907 | trap_ptid = thread_from_lwp (trap_ptid); | |
fb0e1ba7 | 908 | |
39f77062 | 909 | return thread_from_lwp (ptid); |
fb0e1ba7 MK |
910 | } |
911 | ||
912 | static int | |
913 | thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
b4acd559 | 914 | struct mem_attrib *attrib, struct target_ops *target) |
fb0e1ba7 | 915 | { |
39f77062 | 916 | struct cleanup *old_chain = save_inferior_ptid (); |
fb0e1ba7 MK |
917 | int xfer; |
918 | ||
39f77062 | 919 | if (is_thread (inferior_ptid)) |
fb0e1ba7 MK |
920 | { |
921 | /* FIXME: This seems to be necessary to make sure breakpoints | |
922 | are removed. */ | |
21bf60fe | 923 | if (!target_thread_alive (inferior_ptid)) |
39f77062 | 924 | inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); |
fb0e1ba7 | 925 | else |
39f77062 | 926 | inferior_ptid = lwp_from_thread (inferior_ptid); |
fb0e1ba7 MK |
927 | } |
928 | ||
b4acd559 JJ |
929 | xfer = |
930 | target_beneath->to_xfer_memory (memaddr, myaddr, len, write, attrib, | |
931 | target); | |
fb0e1ba7 MK |
932 | |
933 | do_cleanups (old_chain); | |
934 | return xfer; | |
935 | } | |
936 | ||
937 | static void | |
938 | thread_db_fetch_registers (int regno) | |
939 | { | |
5365276c | 940 | struct thread_info *thread_info; |
fb0e1ba7 MK |
941 | prgregset_t gregset; |
942 | gdb_prfpregset_t fpregset; | |
943 | td_err_e err; | |
944 | ||
21bf60fe | 945 | if (!is_thread (inferior_ptid)) |
fb0e1ba7 MK |
946 | { |
947 | /* Pass the request to the target beneath us. */ | |
948 | target_beneath->to_fetch_registers (regno); | |
949 | return; | |
950 | } | |
951 | ||
5365276c DJ |
952 | thread_info = find_thread_pid (inferior_ptid); |
953 | thread_db_map_id2thr (thread_info, 1); | |
fb0e1ba7 | 954 | |
5365276c | 955 | err = td_thr_getgregs_p (&thread_info->private->th, gregset); |
fb0e1ba7 MK |
956 | if (err != TD_OK) |
957 | error ("Cannot fetch general-purpose registers for thread %ld: %s", | |
39f77062 | 958 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 | 959 | |
5365276c | 960 | err = td_thr_getfpregs_p (&thread_info->private->th, &fpregset); |
fb0e1ba7 MK |
961 | if (err != TD_OK) |
962 | error ("Cannot get floating-point registers for thread %ld: %s", | |
39f77062 | 963 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
964 | |
965 | /* Note that we must call supply_gregset after calling the thread_db | |
966 | routines because the thread_db routines call ps_lgetgregs and | |
967 | friends which clobber GDB's register cache. */ | |
968 | supply_gregset ((gdb_gregset_t *) gregset); | |
969 | supply_fpregset (&fpregset); | |
970 | } | |
971 | ||
972 | static void | |
973 | thread_db_store_registers (int regno) | |
974 | { | |
fb0e1ba7 MK |
975 | prgregset_t gregset; |
976 | gdb_prfpregset_t fpregset; | |
977 | td_err_e err; | |
5365276c | 978 | struct thread_info *thread_info; |
fb0e1ba7 | 979 | |
21bf60fe | 980 | if (!is_thread (inferior_ptid)) |
fb0e1ba7 MK |
981 | { |
982 | /* Pass the request to the target beneath us. */ | |
983 | target_beneath->to_store_registers (regno); | |
984 | return; | |
985 | } | |
986 | ||
5365276c DJ |
987 | thread_info = find_thread_pid (inferior_ptid); |
988 | thread_db_map_id2thr (thread_info, 1); | |
fb0e1ba7 MK |
989 | |
990 | if (regno != -1) | |
991 | { | |
123a958e | 992 | char raw[MAX_REGISTER_SIZE]; |
fb0e1ba7 | 993 | |
4caf0990 | 994 | deprecated_read_register_gen (regno, raw); |
fb0e1ba7 MK |
995 | thread_db_fetch_registers (-1); |
996 | supply_register (regno, raw); | |
997 | } | |
998 | ||
999 | fill_gregset ((gdb_gregset_t *) gregset, -1); | |
1000 | fill_fpregset (&fpregset, -1); | |
1001 | ||
5365276c | 1002 | err = td_thr_setgregs_p (&thread_info->private->th, gregset); |
fb0e1ba7 MK |
1003 | if (err != TD_OK) |
1004 | error ("Cannot store general-purpose registers for thread %ld: %s", | |
39f77062 | 1005 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
5365276c | 1006 | err = td_thr_setfpregs_p (&thread_info->private->th, &fpregset); |
fb0e1ba7 MK |
1007 | if (err != TD_OK) |
1008 | error ("Cannot store floating-point registers for thread %ld: %s", | |
39f77062 | 1009 | (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
1010 | } |
1011 | ||
1012 | static void | |
1013 | thread_db_kill (void) | |
1014 | { | |
c194fbe1 MK |
1015 | /* There's no need to save & restore inferior_ptid here, since the |
1016 | inferior isn't supposed to survive this function call. */ | |
1017 | inferior_ptid = lwp_from_thread (inferior_ptid); | |
fb0e1ba7 MK |
1018 | target_beneath->to_kill (); |
1019 | } | |
1020 | ||
1021 | static void | |
1022 | thread_db_create_inferior (char *exec_file, char *allargs, char **env) | |
1023 | { | |
21bf60fe | 1024 | if (!keep_thread_db) |
c194fbe1 MK |
1025 | { |
1026 | unpush_target (&thread_db_ops); | |
1027 | using_thread_db = 0; | |
1028 | } | |
1029 | ||
bda9cb72 MK |
1030 | target_beneath->to_create_inferior (exec_file, allargs, env); |
1031 | } | |
fb0e1ba7 | 1032 | |
bda9cb72 | 1033 | static void |
39f77062 | 1034 | thread_db_post_startup_inferior (ptid_t ptid) |
bda9cb72 MK |
1035 | { |
1036 | if (proc_handle.pid == 0) | |
1037 | { | |
1038 | /* The child process is now the actual multi-threaded | |
1039 | program. Snatch its process ID... */ | |
39f77062 | 1040 | proc_handle.pid = GET_PID (ptid); |
fb0e1ba7 | 1041 | |
bda9cb72 MK |
1042 | /* ...and perform the remaining initialization steps. */ |
1043 | enable_thread_event_reporting (); | |
21bf60fe | 1044 | thread_db_find_new_threads (); |
bda9cb72 | 1045 | } |
fb0e1ba7 MK |
1046 | } |
1047 | ||
1048 | static void | |
1049 | thread_db_mourn_inferior (void) | |
1050 | { | |
1051 | remove_thread_event_breakpoints (); | |
c194fbe1 MK |
1052 | |
1053 | /* Forget about the child's process ID. We shouldn't need it | |
1054 | anymore. */ | |
1055 | proc_handle.pid = 0; | |
fb0e1ba7 MK |
1056 | |
1057 | target_beneath->to_mourn_inferior (); | |
043b2f77 JJ |
1058 | |
1059 | /* Detach thread_db target ops if not dealing with a statically | |
1060 | linked threaded program. This allows a corefile to be debugged | |
1061 | after finishing debugging of a threaded program. At present, | |
1062 | debugging a statically-linked threaded program is broken, but | |
1063 | the check is added below in the event that it is fixed in the | |
1064 | future. */ | |
1065 | if (!keep_thread_db) | |
1066 | { | |
1067 | unpush_target (&thread_db_ops); | |
1068 | using_thread_db = 0; | |
1069 | } | |
fb0e1ba7 MK |
1070 | } |
1071 | ||
1072 | static int | |
39f77062 | 1073 | thread_db_thread_alive (ptid_t ptid) |
fb0e1ba7 | 1074 | { |
5fd913cc | 1075 | td_thrhandle_t th; |
21bf60fe | 1076 | td_err_e err; |
5fd913cc | 1077 | |
39f77062 | 1078 | if (is_thread (ptid)) |
fb0e1ba7 | 1079 | { |
5365276c DJ |
1080 | struct thread_info *thread_info; |
1081 | thread_info = find_thread_pid (ptid); | |
fb0e1ba7 | 1082 | |
5365276c | 1083 | thread_db_map_id2thr (thread_info, 0); |
b4acd559 | 1084 | if (!thread_info->private->th_valid) |
fb0e1ba7 MK |
1085 | return 0; |
1086 | ||
5365276c | 1087 | err = td_thr_validate_p (&thread_info->private->th); |
5fd913cc MS |
1088 | if (err != TD_OK) |
1089 | return 0; | |
1090 | ||
b4acd559 | 1091 | if (!thread_info->private->ti_valid) |
5365276c | 1092 | { |
b4acd559 JJ |
1093 | err = |
1094 | td_thr_get_info_p (&thread_info->private->th, | |
1095 | &thread_info->private->ti); | |
5365276c DJ |
1096 | if (err != TD_OK) |
1097 | return 0; | |
1098 | thread_info->private->ti_valid = 1; | |
1099 | } | |
1100 | ||
1101 | if (thread_info->private->ti.ti_state == TD_THR_UNKNOWN | |
1102 | || thread_info->private->ti.ti_state == TD_THR_ZOMBIE) | |
21bf60fe | 1103 | return 0; /* A zombie thread. */ |
5fd913cc | 1104 | |
fb0e1ba7 MK |
1105 | return 1; |
1106 | } | |
1107 | ||
1108 | if (target_beneath->to_thread_alive) | |
39f77062 | 1109 | return target_beneath->to_thread_alive (ptid); |
fb0e1ba7 MK |
1110 | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | static int | |
1115 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1116 | { | |
1117 | td_thrinfo_t ti; | |
1118 | td_err_e err; | |
39f77062 | 1119 | ptid_t ptid; |
fb0e1ba7 MK |
1120 | |
1121 | err = td_thr_get_info_p (th_p, &ti); | |
1122 | if (err != TD_OK) | |
b4acd559 | 1123 | error ("find_new_threads_callback: cannot get thread info: %s", |
3197744f | 1124 | thread_db_err_str (err)); |
fb0e1ba7 | 1125 | |
21bf60fe MK |
1126 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
1127 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 1128 | |
39f77062 | 1129 | ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid)); |
fb0e1ba7 | 1130 | |
21bf60fe | 1131 | if (!in_thread_list (ptid)) |
39f77062 | 1132 | attach_thread (ptid, th_p, &ti, 1); |
fb0e1ba7 MK |
1133 | |
1134 | return 0; | |
1135 | } | |
1136 | ||
1137 | static void | |
1138 | thread_db_find_new_threads (void) | |
1139 | { | |
1140 | td_err_e err; | |
1141 | ||
1142 | /* Iterate over all user-space threads to discover new threads. */ | |
1143 | err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, | |
1144 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
1145 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
1146 | if (err != TD_OK) | |
1147 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
1148 | } | |
1149 | ||
1150 | static char * | |
39f77062 | 1151 | thread_db_pid_to_str (ptid_t ptid) |
fb0e1ba7 | 1152 | { |
39f77062 | 1153 | if (is_thread (ptid)) |
fb0e1ba7 MK |
1154 | { |
1155 | static char buf[64]; | |
5365276c | 1156 | td_thrinfo_t *ti_p; |
fb0e1ba7 | 1157 | td_err_e err; |
5365276c | 1158 | struct thread_info *thread_info; |
fb0e1ba7 | 1159 | |
5365276c DJ |
1160 | thread_info = find_thread_pid (ptid); |
1161 | thread_db_map_id2thr (thread_info, 0); | |
b4acd559 | 1162 | if (!thread_info->private->th_valid) |
5365276c | 1163 | { |
b4acd559 JJ |
1164 | snprintf (buf, sizeof (buf), "Thread %ld (Missing)", |
1165 | GET_THREAD (ptid)); | |
5365276c DJ |
1166 | return buf; |
1167 | } | |
fb0e1ba7 | 1168 | |
5365276c | 1169 | ti_p = thread_db_get_info (thread_info); |
fb0e1ba7 | 1170 | |
5365276c | 1171 | if (ti_p->ti_state == TD_THR_ACTIVE && ti_p->ti_lid != 0) |
fb0e1ba7 MK |
1172 | { |
1173 | snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", | |
5365276c | 1174 | (long) ti_p->ti_tid, ti_p->ti_lid); |
fb0e1ba7 MK |
1175 | } |
1176 | else | |
1177 | { | |
1178 | snprintf (buf, sizeof (buf), "Thread %ld (%s)", | |
b4acd559 JJ |
1179 | (long) ti_p->ti_tid, |
1180 | thread_db_state_str (ti_p->ti_state)); | |
fb0e1ba7 MK |
1181 | } |
1182 | ||
1183 | return buf; | |
1184 | } | |
1185 | ||
39f77062 KB |
1186 | if (target_beneath->to_pid_to_str (ptid)) |
1187 | return target_beneath->to_pid_to_str (ptid); | |
fb0e1ba7 | 1188 | |
39f77062 | 1189 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1190 | } |
1191 | ||
3f47be5c EZ |
1192 | /* Get the address of the thread local variable in OBJFILE which is |
1193 | stored at OFFSET within the thread local storage for thread PTID. */ | |
1194 | ||
1195 | static CORE_ADDR | |
1196 | thread_db_get_thread_local_address (ptid_t ptid, struct objfile *objfile, | |
b4acd559 | 1197 | CORE_ADDR offset) |
3f47be5c EZ |
1198 | { |
1199 | if (is_thread (ptid)) | |
1200 | { | |
1201 | int objfile_is_library = (objfile->flags & OBJF_SHARED); | |
1202 | td_err_e err; | |
3f47be5c EZ |
1203 | void *address; |
1204 | CORE_ADDR lm; | |
5365276c | 1205 | struct thread_info *thread_info; |
3f47be5c EZ |
1206 | |
1207 | /* glibc doesn't provide the needed interface. */ | |
b4acd559 JJ |
1208 | if (!td_thr_tls_get_addr_p) |
1209 | error ("Cannot find thread-local variables in this thread library."); | |
3f47be5c EZ |
1210 | |
1211 | /* Get the address of the link map for this objfile. */ | |
1212 | lm = svr4_fetch_objfile_link_map (objfile); | |
1213 | ||
1214 | /* Whoops, we couldn't find one. Bail out. */ | |
1215 | if (!lm) | |
b4acd559 JJ |
1216 | { |
1217 | if (objfile_is_library) | |
1218 | error ("Cannot find shared library `%s' link_map in dynamic" | |
3f47be5c EZ |
1219 | " linker's module list", objfile->name); |
1220 | else | |
b4acd559 | 1221 | error ("Cannot find executable file `%s' link_map in dynamic" |
3f47be5c EZ |
1222 | " linker's module list", objfile->name); |
1223 | } | |
1224 | ||
1225 | /* Get info about the thread. */ | |
5365276c DJ |
1226 | thread_info = find_thread_pid (ptid); |
1227 | thread_db_map_id2thr (thread_info, 1); | |
1228 | ||
3f47be5c | 1229 | /* Finally, get the address of the variable. */ |
5365276c DJ |
1230 | err = td_thr_tls_get_addr_p (&thread_info->private->th, (void *) lm, |
1231 | offset, &address); | |
3f47be5c EZ |
1232 | |
1233 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1234 | /* The memory hasn't been allocated, yet. */ | |
1235 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1236 | { |
1237 | /* Now, if libthread_db provided the initialization image's | |
1238 | address, we *could* try to build a non-lvalue value from | |
1239 | the initialization image. */ | |
1240 | if (objfile_is_library) | |
1241 | error ("The inferior has not yet allocated storage for" | |
1242 | " thread-local variables in\n" | |
1243 | "the shared library `%s'\n" | |
1244 | "for the thread %ld", | |
3f47be5c | 1245 | objfile->name, (long) GET_THREAD (ptid)); |
b4acd559 JJ |
1246 | else |
1247 | error ("The inferior has not yet allocated storage for" | |
1248 | " thread-local variables in\n" | |
1249 | "the executable `%s'\n" | |
1250 | "for the thread %ld", | |
3f47be5c EZ |
1251 | objfile->name, (long) GET_THREAD (ptid)); |
1252 | } | |
1253 | #endif | |
1254 | ||
1255 | /* Something else went wrong. */ | |
1256 | if (err != TD_OK) | |
1257 | { | |
1258 | if (objfile_is_library) | |
1259 | error ("Cannot find thread-local storage for thread %ld, " | |
1260 | "shared library %s:\n%s", | |
1261 | (long) GET_THREAD (ptid), | |
b4acd559 | 1262 | objfile->name, thread_db_err_str (err)); |
3f47be5c EZ |
1263 | else |
1264 | error ("Cannot find thread-local storage for thread %ld, " | |
1265 | "executable file %s:\n%s", | |
1266 | (long) GET_THREAD (ptid), | |
b4acd559 | 1267 | objfile->name, thread_db_err_str (err)); |
3f47be5c EZ |
1268 | } |
1269 | ||
1270 | /* Cast assuming host == target. Joy. */ | |
1271 | return (CORE_ADDR) address; | |
1272 | } | |
1273 | ||
1274 | if (target_beneath->to_get_thread_local_address) | |
b4acd559 JJ |
1275 | return target_beneath->to_get_thread_local_address (ptid, objfile, |
1276 | offset); | |
3f47be5c EZ |
1277 | |
1278 | error ("Cannot find thread-local values on this target."); | |
1279 | } | |
1280 | ||
fb0e1ba7 MK |
1281 | static void |
1282 | init_thread_db_ops (void) | |
1283 | { | |
1284 | thread_db_ops.to_shortname = "multi-thread"; | |
1285 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1286 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
c194fbe1 | 1287 | thread_db_ops.to_attach = thread_db_attach; |
fb0e1ba7 MK |
1288 | thread_db_ops.to_detach = thread_db_detach; |
1289 | thread_db_ops.to_resume = thread_db_resume; | |
1290 | thread_db_ops.to_wait = thread_db_wait; | |
1291 | thread_db_ops.to_fetch_registers = thread_db_fetch_registers; | |
1292 | thread_db_ops.to_store_registers = thread_db_store_registers; | |
1293 | thread_db_ops.to_xfer_memory = thread_db_xfer_memory; | |
1294 | thread_db_ops.to_kill = thread_db_kill; | |
1295 | thread_db_ops.to_create_inferior = thread_db_create_inferior; | |
bda9cb72 | 1296 | thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior; |
fb0e1ba7 MK |
1297 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
1298 | thread_db_ops.to_thread_alive = thread_db_thread_alive; | |
1299 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; | |
1300 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1301 | thread_db_ops.to_stratum = thread_stratum; | |
1302 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1303 | thread_db_ops.to_get_thread_local_address |
1304 | = thread_db_get_thread_local_address; | |
fb0e1ba7 MK |
1305 | thread_db_ops.to_magic = OPS_MAGIC; |
1306 | } | |
1307 | ||
1308 | void | |
1309 | _initialize_thread_db (void) | |
1310 | { | |
1311 | /* Only initialize the module if we can load libthread_db. */ | |
1312 | if (thread_db_load ()) | |
1313 | { | |
1314 | init_thread_db_ops (); | |
1315 | add_target (&thread_db_ops); | |
1316 | ||
1317 | /* Add ourselves to objfile event chain. */ | |
540af400 | 1318 | target_new_objfile_chain = target_new_objfile_hook; |
fb0e1ba7 MK |
1319 | target_new_objfile_hook = thread_db_new_objfile; |
1320 | } | |
1321 | } |