Commit | Line | Data |
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0d62e5e8 | 1 | /* Thread management interface, for the remote server for GDB. |
0fb0cc75 | 2 | Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009 |
9b254dd1 | 3 | Free Software Foundation, Inc. |
0d62e5e8 DJ |
4 | |
5 | Contributed by MontaVista Software. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
0d62e5e8 DJ |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0d62e5e8 DJ |
21 | |
22 | #include "server.h" | |
23 | ||
24 | #include "linux-low.h" | |
25 | ||
26 | extern int debug_threads; | |
27 | ||
24a09b5f DJ |
28 | static int thread_db_use_events; |
29 | ||
0d62e5e8 DJ |
30 | #ifdef HAVE_THREAD_DB_H |
31 | #include <thread_db.h> | |
32 | #endif | |
33 | ||
0050a760 | 34 | #include "gdb_proc_service.h" |
0d62e5e8 | 35 | |
186947f7 DJ |
36 | #include <stdint.h> |
37 | ||
0d62e5e8 DJ |
38 | /* Structure that identifies the child process for the |
39 | <proc_service.h> interface. */ | |
40 | static struct ps_prochandle proc_handle; | |
41 | ||
42 | /* Connection to the libthread_db library. */ | |
43 | static td_thragent_t *thread_agent; | |
44 | ||
24a09b5f | 45 | static int find_one_thread (int); |
0d62e5e8 DJ |
46 | static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
47 | ||
54363045 | 48 | static const char * |
0d62e5e8 DJ |
49 | thread_db_err_str (td_err_e err) |
50 | { | |
51 | static char buf[64]; | |
52 | ||
53 | switch (err) | |
54 | { | |
55 | case TD_OK: | |
56 | return "generic 'call succeeded'"; | |
57 | case TD_ERR: | |
58 | return "generic error"; | |
59 | case TD_NOTHR: | |
60 | return "no thread to satisfy query"; | |
61 | case TD_NOSV: | |
62 | return "no sync handle to satisfy query"; | |
63 | case TD_NOLWP: | |
64 | return "no LWP to satisfy query"; | |
65 | case TD_BADPH: | |
66 | return "invalid process handle"; | |
67 | case TD_BADTH: | |
68 | return "invalid thread handle"; | |
69 | case TD_BADSH: | |
70 | return "invalid synchronization handle"; | |
71 | case TD_BADTA: | |
72 | return "invalid thread agent"; | |
73 | case TD_BADKEY: | |
74 | return "invalid key"; | |
75 | case TD_NOMSG: | |
76 | return "no event message for getmsg"; | |
77 | case TD_NOFPREGS: | |
78 | return "FPU register set not available"; | |
79 | case TD_NOLIBTHREAD: | |
80 | return "application not linked with libthread"; | |
81 | case TD_NOEVENT: | |
82 | return "requested event is not supported"; | |
83 | case TD_NOCAPAB: | |
84 | return "capability not available"; | |
85 | case TD_DBERR: | |
86 | return "debugger service failed"; | |
87 | case TD_NOAPLIC: | |
88 | return "operation not applicable to"; | |
89 | case TD_NOTSD: | |
90 | return "no thread-specific data for this thread"; | |
91 | case TD_MALLOC: | |
92 | return "malloc failed"; | |
93 | case TD_PARTIALREG: | |
94 | return "only part of register set was written/read"; | |
95 | case TD_NOXREGS: | |
96 | return "X register set not available for this thread"; | |
3db0444b DJ |
97 | #ifdef HAVE_TD_VERSION |
98 | case TD_VERSION: | |
99 | return "version mismatch between libthread_db and libpthread"; | |
100 | #endif | |
0d62e5e8 DJ |
101 | default: |
102 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
103 | return buf; | |
104 | } | |
105 | } | |
106 | ||
107 | #if 0 | |
108 | static char * | |
109 | thread_db_state_str (td_thr_state_e state) | |
110 | { | |
111 | static char buf[64]; | |
112 | ||
113 | switch (state) | |
114 | { | |
115 | case TD_THR_STOPPED: | |
116 | return "stopped by debugger"; | |
117 | case TD_THR_RUN: | |
118 | return "runnable"; | |
119 | case TD_THR_ACTIVE: | |
120 | return "active"; | |
121 | case TD_THR_ZOMBIE: | |
122 | return "zombie"; | |
123 | case TD_THR_SLEEP: | |
124 | return "sleeping"; | |
125 | case TD_THR_STOPPED_ASLEEP: | |
126 | return "stopped by debugger AND blocked"; | |
127 | default: | |
128 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
129 | return buf; | |
130 | } | |
131 | } | |
132 | #endif | |
133 | ||
b65d95c5 | 134 | static int |
0d62e5e8 DJ |
135 | thread_db_create_event (CORE_ADDR where) |
136 | { | |
137 | td_event_msg_t msg; | |
138 | td_err_e err; | |
4105de34 | 139 | struct process_info *process; |
0d62e5e8 DJ |
140 | |
141 | if (debug_threads) | |
142 | fprintf (stderr, "Thread creation event.\n"); | |
143 | ||
0d62e5e8 DJ |
144 | /* FIXME: This assumes we don't get another event. |
145 | In the LinuxThreads implementation, this is safe, | |
146 | because all events come from the manager thread | |
147 | (except for its own creation, of course). */ | |
148 | err = td_ta_event_getmsg (thread_agent, &msg); | |
149 | if (err != TD_OK) | |
150 | fprintf (stderr, "thread getmsg err: %s\n", | |
151 | thread_db_err_str (err)); | |
152 | ||
4105de34 DJ |
153 | /* If we do not know about the main thread yet, this would be a good time to |
154 | find it. We need to do this to pick up the main thread before any newly | |
155 | created threads. */ | |
ae13219e | 156 | process = get_thread_process (current_inferior); |
4105de34 | 157 | if (process->thread_known == 0) |
24a09b5f | 158 | find_one_thread (process->lwpid); |
4105de34 | 159 | |
0d62e5e8 DJ |
160 | /* msg.event == TD_EVENT_CREATE */ |
161 | ||
162 | find_new_threads_callback (msg.th_p, NULL); | |
b65d95c5 DJ |
163 | |
164 | return 0; | |
0d62e5e8 DJ |
165 | } |
166 | ||
167 | #if 0 | |
b65d95c5 | 168 | static int |
0d62e5e8 DJ |
169 | thread_db_death_event (CORE_ADDR where) |
170 | { | |
171 | if (debug_threads) | |
172 | fprintf (stderr, "Thread death event.\n"); | |
b65d95c5 DJ |
173 | |
174 | return 0; | |
0d62e5e8 DJ |
175 | } |
176 | #endif | |
177 | ||
178 | static int | |
179 | thread_db_enable_reporting () | |
180 | { | |
181 | td_thr_events_t events; | |
182 | td_notify_t notify; | |
183 | td_err_e err; | |
184 | ||
185 | /* Set the process wide mask saying which events we're interested in. */ | |
186 | td_event_emptyset (&events); | |
187 | td_event_addset (&events, TD_CREATE); | |
188 | ||
189 | #if 0 | |
190 | /* This is reported to be broken in glibc 2.1.3. A different approach | |
191 | will be necessary to support that. */ | |
192 | td_event_addset (&events, TD_DEATH); | |
193 | #endif | |
194 | ||
195 | err = td_ta_set_event (thread_agent, &events); | |
196 | if (err != TD_OK) | |
197 | { | |
198 | warning ("Unable to set global thread event mask: %s", | |
199 | thread_db_err_str (err)); | |
200 | return 0; | |
201 | } | |
202 | ||
203 | /* Get address for thread creation breakpoint. */ | |
204 | err = td_ta_event_addr (thread_agent, TD_CREATE, ¬ify); | |
205 | if (err != TD_OK) | |
206 | { | |
207 | warning ("Unable to get location for thread creation breakpoint: %s", | |
208 | thread_db_err_str (err)); | |
209 | return 0; | |
210 | } | |
211 | set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, | |
212 | thread_db_create_event); | |
213 | ||
214 | #if 0 | |
215 | /* Don't concern ourselves with reported thread deaths, only | |
216 | with actual thread deaths (via wait). */ | |
217 | ||
218 | /* Get address for thread death breakpoint. */ | |
219 | err = td_ta_event_addr (thread_agent, TD_DEATH, ¬ify); | |
220 | if (err != TD_OK) | |
221 | { | |
222 | warning ("Unable to get location for thread death breakpoint: %s", | |
223 | thread_db_err_str (err)); | |
224 | return; | |
225 | } | |
226 | set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, | |
227 | thread_db_death_event); | |
228 | #endif | |
229 | ||
230 | return 1; | |
231 | } | |
232 | ||
ae13219e | 233 | static int |
24a09b5f | 234 | find_one_thread (int lwpid) |
0d62e5e8 | 235 | { |
ae13219e DJ |
236 | td_thrhandle_t th; |
237 | td_thrinfo_t ti; | |
0d62e5e8 DJ |
238 | td_err_e err; |
239 | struct thread_info *inferior; | |
240 | struct process_info *process; | |
241 | ||
24a09b5f | 242 | inferior = (struct thread_info *) find_inferior_id (&all_threads, lwpid); |
ae13219e DJ |
243 | process = get_thread_process (inferior); |
244 | if (process->thread_known) | |
245 | return 1; | |
246 | ||
24a09b5f | 247 | /* Get information about this thread. */ |
ae13219e DJ |
248 | err = td_ta_map_lwp2thr (thread_agent, process->lwpid, &th); |
249 | if (err != TD_OK) | |
24a09b5f DJ |
250 | error ("Cannot get thread handle for LWP %d: %s", |
251 | lwpid, thread_db_err_str (err)); | |
ae13219e DJ |
252 | |
253 | err = td_thr_get_info (&th, &ti); | |
254 | if (err != TD_OK) | |
24a09b5f DJ |
255 | error ("Cannot get thread info for LWP %d: %s", |
256 | lwpid, thread_db_err_str (err)); | |
ae13219e DJ |
257 | |
258 | if (debug_threads) | |
24a09b5f | 259 | fprintf (stderr, "Found thread %ld (LWP %d)\n", |
ae13219e DJ |
260 | ti.ti_tid, ti.ti_lid); |
261 | ||
262 | if (process->lwpid != ti.ti_lid) | |
24a09b5f DJ |
263 | { |
264 | warning ("PID mismatch! Expected %ld, got %ld", | |
265 | (long) process->lwpid, (long) ti.ti_lid); | |
266 | return 0; | |
267 | } | |
ae13219e | 268 | |
24a09b5f | 269 | if (thread_db_use_events) |
0d62e5e8 | 270 | { |
ae13219e DJ |
271 | err = td_thr_event_enable (&th, 1); |
272 | if (err != TD_OK) | |
273 | error ("Cannot enable thread event reporting for %d: %s", | |
274 | ti.ti_lid, thread_db_err_str (err)); | |
0d62e5e8 | 275 | } |
ae13219e | 276 | |
24a09b5f DJ |
277 | /* If the new thread ID is zero, a final thread ID will be available |
278 | later. Do not enable thread debugging yet. */ | |
279 | if (ti.ti_tid == 0) | |
280 | return 0; | |
ae13219e | 281 | |
ae13219e DJ |
282 | process->thread_known = 1; |
283 | process->th = th; | |
284 | ||
ae13219e DJ |
285 | return 1; |
286 | } | |
287 | ||
288 | static void | |
289 | maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p) | |
290 | { | |
291 | td_err_e err; | |
292 | struct thread_info *inferior; | |
293 | struct process_info *process; | |
294 | ||
0d62e5e8 | 295 | inferior = (struct thread_info *) find_inferior_id (&all_threads, |
24a09b5f | 296 | ti_p->ti_lid); |
0d62e5e8 DJ |
297 | if (inferior != NULL) |
298 | return; | |
299 | ||
300 | if (debug_threads) | |
301 | fprintf (stderr, "Attaching to thread %ld (LWP %d)\n", | |
302 | ti_p->ti_tid, ti_p->ti_lid); | |
24a09b5f | 303 | linux_attach_lwp (ti_p->ti_lid); |
0d62e5e8 | 304 | inferior = (struct thread_info *) find_inferior_id (&all_threads, |
24a09b5f | 305 | ti_p->ti_lid); |
0d62e5e8 DJ |
306 | if (inferior == NULL) |
307 | { | |
308 | warning ("Could not attach to thread %ld (LWP %d)\n", | |
309 | ti_p->ti_tid, ti_p->ti_lid); | |
310 | return; | |
311 | } | |
312 | ||
313 | process = inferior_target_data (inferior); | |
314 | ||
0d62e5e8 | 315 | process->thread_known = 1; |
dae5f5cf | 316 | process->th = *th_p; |
24a09b5f DJ |
317 | |
318 | if (thread_db_use_events) | |
319 | { | |
320 | err = td_thr_event_enable (th_p, 1); | |
321 | if (err != TD_OK) | |
322 | error ("Cannot enable thread event reporting for %d: %s", | |
323 | ti_p->ti_lid, thread_db_err_str (err)); | |
324 | } | |
0d62e5e8 DJ |
325 | } |
326 | ||
327 | static int | |
328 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
329 | { | |
330 | td_thrinfo_t ti; | |
331 | td_err_e err; | |
332 | ||
333 | err = td_thr_get_info (th_p, &ti); | |
334 | if (err != TD_OK) | |
335 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
336 | ||
337 | /* Check for zombies. */ | |
338 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) | |
339 | return 0; | |
340 | ||
341 | maybe_attach_thread (th_p, &ti); | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
346 | static void | |
347 | thread_db_find_new_threads (void) | |
348 | { | |
349 | td_err_e err; | |
350 | ||
ae13219e DJ |
351 | /* This function is only called when we first initialize thread_db. |
352 | First locate the initial thread. If it is not ready for | |
353 | debugging yet, then stop. */ | |
24a09b5f | 354 | if (find_one_thread (all_threads.head->id) == 0) |
ae13219e DJ |
355 | return; |
356 | ||
0d62e5e8 DJ |
357 | /* Iterate over all user-space threads to discover new threads. */ |
358 | err = td_ta_thr_iter (thread_agent, find_new_threads_callback, NULL, | |
359 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
360 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
361 | if (err != TD_OK) | |
362 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
363 | } | |
364 | ||
fd500816 DJ |
365 | /* Cache all future symbols that thread_db might request. We can not |
366 | request symbols at arbitrary states in the remote protocol, only | |
367 | when the client tells us that new symbols are available. So when | |
368 | we load the thread library, make sure to check the entire list. */ | |
369 | ||
370 | static void | |
371 | thread_db_look_up_symbols (void) | |
372 | { | |
373 | const char **sym_list = td_symbol_list (); | |
374 | CORE_ADDR unused; | |
375 | ||
376 | for (sym_list = td_symbol_list (); *sym_list; sym_list++) | |
377 | look_up_one_symbol (*sym_list, &unused); | |
378 | } | |
379 | ||
dae5f5cf DJ |
380 | int |
381 | thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, | |
382 | CORE_ADDR load_module, CORE_ADDR *address) | |
383 | { | |
384 | #if HAVE_TD_THR_TLS_GET_ADDR | |
385 | psaddr_t addr; | |
386 | td_err_e err; | |
387 | struct process_info *process; | |
388 | ||
389 | process = get_thread_process (thread); | |
4105de34 | 390 | if (!process->thread_known) |
24a09b5f | 391 | find_one_thread (process->lwpid); |
dae5f5cf DJ |
392 | if (!process->thread_known) |
393 | return TD_NOTHR; | |
394 | ||
186947f7 DJ |
395 | /* Note the cast through uintptr_t: this interface only works if |
396 | a target address fits in a psaddr_t, which is a host pointer. | |
397 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
398 | err = td_thr_tls_get_addr (&process->th, (psaddr_t) (uintptr_t) load_module, | |
399 | offset, &addr); | |
dae5f5cf DJ |
400 | if (err == TD_OK) |
401 | { | |
186947f7 | 402 | *address = (CORE_ADDR) (uintptr_t) addr; |
dae5f5cf DJ |
403 | return 0; |
404 | } | |
405 | else | |
406 | return err; | |
407 | #else | |
408 | return -1; | |
409 | #endif | |
410 | } | |
411 | ||
0d62e5e8 | 412 | int |
24a09b5f | 413 | thread_db_init (int use_events) |
0d62e5e8 DJ |
414 | { |
415 | int err; | |
416 | ||
fd500816 DJ |
417 | /* FIXME drow/2004-10-16: This is the "overall process ID", which |
418 | GNU/Linux calls tgid, "thread group ID". When we support | |
419 | attaching to threads, the original thread may not be the correct | |
420 | thread. We would have to get the process ID from /proc for NPTL. | |
421 | For LinuxThreads we could do something similar: follow the chain | |
422 | of parent processes until we find the highest one we're attached | |
423 | to, and use its tgid. | |
424 | ||
425 | This isn't the only place in gdbserver that assumes that the first | |
426 | process in the list is the thread group leader. */ | |
0d62e5e8 DJ |
427 | proc_handle.pid = ((struct inferior_list_entry *)current_inferior)->id; |
428 | ||
ea025f5f DJ |
429 | /* Allow new symbol lookups. */ |
430 | all_symbols_looked_up = 0; | |
431 | ||
24a09b5f DJ |
432 | thread_db_use_events = use_events; |
433 | ||
0d62e5e8 DJ |
434 | err = td_ta_new (&proc_handle, &thread_agent); |
435 | switch (err) | |
436 | { | |
437 | case TD_NOLIBTHREAD: | |
438 | /* No thread library was detected. */ | |
439 | return 0; | |
440 | ||
441 | case TD_OK: | |
442 | /* The thread library was detected. */ | |
443 | ||
24a09b5f | 444 | if (use_events && thread_db_enable_reporting () == 0) |
0d62e5e8 DJ |
445 | return 0; |
446 | thread_db_find_new_threads (); | |
fd500816 | 447 | thread_db_look_up_symbols (); |
ea025f5f | 448 | all_symbols_looked_up = 1; |
0d62e5e8 DJ |
449 | return 1; |
450 | ||
451 | default: | |
3db0444b DJ |
452 | warning ("error initializing thread_db library: %s", |
453 | thread_db_err_str (err)); | |
0d62e5e8 DJ |
454 | } |
455 | ||
456 | return 0; | |
457 | } |