Commit | Line | Data |
---|---|---|
0d62e5e8 | 1 | /* Thread management interface, for the remote server for GDB. |
6aba47ca | 2 | Copyright (C) 2002, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
0d62e5e8 DJ |
3 | |
4 | Contributed by MontaVista Software. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
6f0f660e EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
0d62e5e8 DJ |
22 | |
23 | #include "server.h" | |
24 | ||
25 | #include "linux-low.h" | |
26 | ||
27 | extern int debug_threads; | |
28 | ||
29 | #ifdef HAVE_THREAD_DB_H | |
30 | #include <thread_db.h> | |
31 | #endif | |
32 | ||
0050a760 | 33 | #include "gdb_proc_service.h" |
0d62e5e8 | 34 | |
186947f7 DJ |
35 | #include <stdint.h> |
36 | ||
0d62e5e8 DJ |
37 | /* Structure that identifies the child process for the |
38 | <proc_service.h> interface. */ | |
39 | static struct ps_prochandle proc_handle; | |
40 | ||
41 | /* Connection to the libthread_db library. */ | |
42 | static td_thragent_t *thread_agent; | |
43 | ||
ae13219e | 44 | static int find_first_thread (void); |
0d62e5e8 DJ |
45 | static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
46 | ||
47 | static char * | |
48 | thread_db_err_str (td_err_e err) | |
49 | { | |
50 | static char buf[64]; | |
51 | ||
52 | switch (err) | |
53 | { | |
54 | case TD_OK: | |
55 | return "generic 'call succeeded'"; | |
56 | case TD_ERR: | |
57 | return "generic error"; | |
58 | case TD_NOTHR: | |
59 | return "no thread to satisfy query"; | |
60 | case TD_NOSV: | |
61 | return "no sync handle to satisfy query"; | |
62 | case TD_NOLWP: | |
63 | return "no LWP to satisfy query"; | |
64 | case TD_BADPH: | |
65 | return "invalid process handle"; | |
66 | case TD_BADTH: | |
67 | return "invalid thread handle"; | |
68 | case TD_BADSH: | |
69 | return "invalid synchronization handle"; | |
70 | case TD_BADTA: | |
71 | return "invalid thread agent"; | |
72 | case TD_BADKEY: | |
73 | return "invalid key"; | |
74 | case TD_NOMSG: | |
75 | return "no event message for getmsg"; | |
76 | case TD_NOFPREGS: | |
77 | return "FPU register set not available"; | |
78 | case TD_NOLIBTHREAD: | |
79 | return "application not linked with libthread"; | |
80 | case TD_NOEVENT: | |
81 | return "requested event is not supported"; | |
82 | case TD_NOCAPAB: | |
83 | return "capability not available"; | |
84 | case TD_DBERR: | |
85 | return "debugger service failed"; | |
86 | case TD_NOAPLIC: | |
87 | return "operation not applicable to"; | |
88 | case TD_NOTSD: | |
89 | return "no thread-specific data for this thread"; | |
90 | case TD_MALLOC: | |
91 | return "malloc failed"; | |
92 | case TD_PARTIALREG: | |
93 | return "only part of register set was written/read"; | |
94 | case TD_NOXREGS: | |
95 | return "X register set not available for this thread"; | |
3db0444b DJ |
96 | #ifdef HAVE_TD_VERSION |
97 | case TD_VERSION: | |
98 | return "version mismatch between libthread_db and libpthread"; | |
99 | #endif | |
0d62e5e8 DJ |
100 | default: |
101 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
102 | return buf; | |
103 | } | |
104 | } | |
105 | ||
106 | #if 0 | |
107 | static char * | |
108 | thread_db_state_str (td_thr_state_e state) | |
109 | { | |
110 | static char buf[64]; | |
111 | ||
112 | switch (state) | |
113 | { | |
114 | case TD_THR_STOPPED: | |
115 | return "stopped by debugger"; | |
116 | case TD_THR_RUN: | |
117 | return "runnable"; | |
118 | case TD_THR_ACTIVE: | |
119 | return "active"; | |
120 | case TD_THR_ZOMBIE: | |
121 | return "zombie"; | |
122 | case TD_THR_SLEEP: | |
123 | return "sleeping"; | |
124 | case TD_THR_STOPPED_ASLEEP: | |
125 | return "stopped by debugger AND blocked"; | |
126 | default: | |
127 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
128 | return buf; | |
129 | } | |
130 | } | |
131 | #endif | |
132 | ||
133 | static void | |
134 | thread_db_create_event (CORE_ADDR where) | |
135 | { | |
136 | td_event_msg_t msg; | |
137 | td_err_e err; | |
4105de34 | 138 | struct process_info *process; |
0d62e5e8 DJ |
139 | |
140 | if (debug_threads) | |
141 | fprintf (stderr, "Thread creation event.\n"); | |
142 | ||
0d62e5e8 DJ |
143 | /* FIXME: This assumes we don't get another event. |
144 | In the LinuxThreads implementation, this is safe, | |
145 | because all events come from the manager thread | |
146 | (except for its own creation, of course). */ | |
147 | err = td_ta_event_getmsg (thread_agent, &msg); | |
148 | if (err != TD_OK) | |
149 | fprintf (stderr, "thread getmsg err: %s\n", | |
150 | thread_db_err_str (err)); | |
151 | ||
4105de34 DJ |
152 | /* If we do not know about the main thread yet, this would be a good time to |
153 | find it. We need to do this to pick up the main thread before any newly | |
154 | created threads. */ | |
ae13219e | 155 | process = get_thread_process (current_inferior); |
4105de34 | 156 | if (process->thread_known == 0) |
ae13219e | 157 | find_first_thread (); |
4105de34 | 158 | |
0d62e5e8 DJ |
159 | /* msg.event == TD_EVENT_CREATE */ |
160 | ||
161 | find_new_threads_callback (msg.th_p, NULL); | |
162 | } | |
163 | ||
164 | #if 0 | |
165 | static void | |
166 | thread_db_death_event (CORE_ADDR where) | |
167 | { | |
168 | if (debug_threads) | |
169 | fprintf (stderr, "Thread death event.\n"); | |
170 | } | |
171 | #endif | |
172 | ||
173 | static int | |
174 | thread_db_enable_reporting () | |
175 | { | |
176 | td_thr_events_t events; | |
177 | td_notify_t notify; | |
178 | td_err_e err; | |
179 | ||
180 | /* Set the process wide mask saying which events we're interested in. */ | |
181 | td_event_emptyset (&events); | |
182 | td_event_addset (&events, TD_CREATE); | |
183 | ||
184 | #if 0 | |
185 | /* This is reported to be broken in glibc 2.1.3. A different approach | |
186 | will be necessary to support that. */ | |
187 | td_event_addset (&events, TD_DEATH); | |
188 | #endif | |
189 | ||
190 | err = td_ta_set_event (thread_agent, &events); | |
191 | if (err != TD_OK) | |
192 | { | |
193 | warning ("Unable to set global thread event mask: %s", | |
194 | thread_db_err_str (err)); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | /* Get address for thread creation breakpoint. */ | |
199 | err = td_ta_event_addr (thread_agent, TD_CREATE, ¬ify); | |
200 | if (err != TD_OK) | |
201 | { | |
202 | warning ("Unable to get location for thread creation breakpoint: %s", | |
203 | thread_db_err_str (err)); | |
204 | return 0; | |
205 | } | |
206 | set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, | |
207 | thread_db_create_event); | |
208 | ||
209 | #if 0 | |
210 | /* Don't concern ourselves with reported thread deaths, only | |
211 | with actual thread deaths (via wait). */ | |
212 | ||
213 | /* Get address for thread death breakpoint. */ | |
214 | err = td_ta_event_addr (thread_agent, TD_DEATH, ¬ify); | |
215 | if (err != TD_OK) | |
216 | { | |
217 | warning ("Unable to get location for thread death breakpoint: %s", | |
218 | thread_db_err_str (err)); | |
219 | return; | |
220 | } | |
221 | set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, | |
222 | thread_db_death_event); | |
223 | #endif | |
224 | ||
225 | return 1; | |
226 | } | |
227 | ||
ae13219e DJ |
228 | static int |
229 | find_first_thread (void) | |
0d62e5e8 | 230 | { |
ae13219e DJ |
231 | td_thrhandle_t th; |
232 | td_thrinfo_t ti; | |
0d62e5e8 DJ |
233 | td_err_e err; |
234 | struct thread_info *inferior; | |
235 | struct process_info *process; | |
236 | ||
ae13219e DJ |
237 | inferior = (struct thread_info *) all_threads.head; |
238 | process = get_thread_process (inferior); | |
239 | if (process->thread_known) | |
240 | return 1; | |
241 | ||
242 | /* Get information about the one thread we know we have. */ | |
243 | err = td_ta_map_lwp2thr (thread_agent, process->lwpid, &th); | |
244 | if (err != TD_OK) | |
245 | error ("Cannot get first thread handle: %s", thread_db_err_str (err)); | |
246 | ||
247 | err = td_thr_get_info (&th, &ti); | |
248 | if (err != TD_OK) | |
249 | error ("Cannot get first thread info: %s", thread_db_err_str (err)); | |
250 | ||
251 | if (debug_threads) | |
252 | fprintf (stderr, "Found first thread %ld (LWP %d)\n", | |
253 | ti.ti_tid, ti.ti_lid); | |
254 | ||
255 | if (process->lwpid != ti.ti_lid) | |
256 | fatal ("PID mismatch! Expected %ld, got %ld", | |
257 | (long) process->lwpid, (long) ti.ti_lid); | |
258 | ||
259 | /* If the new thread ID is zero, a final thread ID will be available | |
260 | later. Do not enable thread debugging yet. */ | |
261 | if (ti.ti_tid == 0) | |
0d62e5e8 | 262 | { |
ae13219e DJ |
263 | err = td_thr_event_enable (&th, 1); |
264 | if (err != TD_OK) | |
265 | error ("Cannot enable thread event reporting for %d: %s", | |
266 | ti.ti_lid, thread_db_err_str (err)); | |
267 | return 0; | |
0d62e5e8 | 268 | } |
ae13219e DJ |
269 | |
270 | /* Switch to indexing the threads list by TID. */ | |
271 | change_inferior_id (&all_threads, ti.ti_tid); | |
272 | ||
273 | new_thread_notify (ti.ti_tid); | |
274 | ||
275 | process->tid = ti.ti_tid; | |
276 | process->lwpid = ti.ti_lid; | |
277 | process->thread_known = 1; | |
278 | process->th = th; | |
279 | ||
280 | err = td_thr_event_enable (&th, 1); | |
281 | if (err != TD_OK) | |
282 | error ("Cannot enable thread event reporting for %d: %s", | |
283 | ti.ti_lid, thread_db_err_str (err)); | |
284 | ||
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 DJ |
295 | inferior = (struct thread_info *) find_inferior_id (&all_threads, |
296 | ti_p->ti_tid); | |
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); | |
303 | linux_attach_lwp (ti_p->ti_lid, ti_p->ti_tid); | |
304 | inferior = (struct thread_info *) find_inferior_id (&all_threads, | |
305 | ti_p->ti_tid); | |
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 DJ |
315 | new_thread_notify (ti_p->ti_tid); |
316 | ||
317 | process->tid = ti_p->ti_tid; | |
318 | process->lwpid = ti_p->ti_lid; | |
319 | ||
320 | process->thread_known = 1; | |
dae5f5cf | 321 | process->th = *th_p; |
0d62e5e8 DJ |
322 | err = td_thr_event_enable (th_p, 1); |
323 | if (err != TD_OK) | |
324 | error ("Cannot enable thread event reporting for %d: %s", | |
325 | ti_p->ti_lid, thread_db_err_str (err)); | |
326 | } | |
327 | ||
328 | static int | |
329 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
330 | { | |
331 | td_thrinfo_t ti; | |
332 | td_err_e err; | |
333 | ||
334 | err = td_thr_get_info (th_p, &ti); | |
335 | if (err != TD_OK) | |
336 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
337 | ||
338 | /* Check for zombies. */ | |
339 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) | |
340 | return 0; | |
341 | ||
342 | maybe_attach_thread (th_p, &ti); | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | static void | |
348 | thread_db_find_new_threads (void) | |
349 | { | |
350 | td_err_e err; | |
351 | ||
ae13219e DJ |
352 | /* This function is only called when we first initialize thread_db. |
353 | First locate the initial thread. If it is not ready for | |
354 | debugging yet, then stop. */ | |
355 | if (find_first_thread () == 0) | |
356 | return; | |
357 | ||
0d62e5e8 DJ |
358 | /* Iterate over all user-space threads to discover new threads. */ |
359 | err = td_ta_thr_iter (thread_agent, find_new_threads_callback, NULL, | |
360 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
361 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
362 | if (err != TD_OK) | |
363 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
364 | } | |
365 | ||
fd500816 DJ |
366 | /* Cache all future symbols that thread_db might request. We can not |
367 | request symbols at arbitrary states in the remote protocol, only | |
368 | when the client tells us that new symbols are available. So when | |
369 | we load the thread library, make sure to check the entire list. */ | |
370 | ||
371 | static void | |
372 | thread_db_look_up_symbols (void) | |
373 | { | |
374 | const char **sym_list = td_symbol_list (); | |
375 | CORE_ADDR unused; | |
376 | ||
377 | for (sym_list = td_symbol_list (); *sym_list; sym_list++) | |
378 | look_up_one_symbol (*sym_list, &unused); | |
379 | } | |
380 | ||
dae5f5cf DJ |
381 | int |
382 | thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, | |
383 | CORE_ADDR load_module, CORE_ADDR *address) | |
384 | { | |
385 | #if HAVE_TD_THR_TLS_GET_ADDR | |
386 | psaddr_t addr; | |
387 | td_err_e err; | |
388 | struct process_info *process; | |
389 | ||
390 | process = get_thread_process (thread); | |
4105de34 | 391 | if (!process->thread_known) |
ae13219e | 392 | find_first_thread (); |
dae5f5cf DJ |
393 | if (!process->thread_known) |
394 | return TD_NOTHR; | |
395 | ||
186947f7 DJ |
396 | /* Note the cast through uintptr_t: this interface only works if |
397 | a target address fits in a psaddr_t, which is a host pointer. | |
398 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
399 | err = td_thr_tls_get_addr (&process->th, (psaddr_t) (uintptr_t) load_module, | |
400 | offset, &addr); | |
dae5f5cf DJ |
401 | if (err == TD_OK) |
402 | { | |
186947f7 | 403 | *address = (CORE_ADDR) (uintptr_t) addr; |
dae5f5cf DJ |
404 | return 0; |
405 | } | |
406 | else | |
407 | return err; | |
408 | #else | |
409 | return -1; | |
410 | #endif | |
411 | } | |
412 | ||
0d62e5e8 DJ |
413 | int |
414 | thread_db_init () | |
415 | { | |
416 | int err; | |
417 | ||
fd500816 DJ |
418 | /* FIXME drow/2004-10-16: This is the "overall process ID", which |
419 | GNU/Linux calls tgid, "thread group ID". When we support | |
420 | attaching to threads, the original thread may not be the correct | |
421 | thread. We would have to get the process ID from /proc for NPTL. | |
422 | For LinuxThreads we could do something similar: follow the chain | |
423 | of parent processes until we find the highest one we're attached | |
424 | to, and use its tgid. | |
425 | ||
426 | This isn't the only place in gdbserver that assumes that the first | |
427 | process in the list is the thread group leader. */ | |
0d62e5e8 DJ |
428 | proc_handle.pid = ((struct inferior_list_entry *)current_inferior)->id; |
429 | ||
ea025f5f DJ |
430 | /* Allow new symbol lookups. */ |
431 | all_symbols_looked_up = 0; | |
432 | ||
0d62e5e8 DJ |
433 | err = td_ta_new (&proc_handle, &thread_agent); |
434 | switch (err) | |
435 | { | |
436 | case TD_NOLIBTHREAD: | |
437 | /* No thread library was detected. */ | |
438 | return 0; | |
439 | ||
440 | case TD_OK: | |
441 | /* The thread library was detected. */ | |
442 | ||
443 | if (thread_db_enable_reporting () == 0) | |
444 | return 0; | |
445 | thread_db_find_new_threads (); | |
fd500816 | 446 | thread_db_look_up_symbols (); |
ea025f5f | 447 | all_symbols_looked_up = 1; |
0d62e5e8 DJ |
448 | return 1; |
449 | ||
450 | default: | |
3db0444b DJ |
451 | warning ("error initializing thread_db library: %s", |
452 | thread_db_err_str (err)); | |
0d62e5e8 DJ |
453 | } |
454 | ||
455 | return 0; | |
456 | } |