Commit | Line | Data |
---|---|---|
0d62e5e8 | 1 | /* Thread management interface, for the remote server for GDB. |
4c38e0a4 | 2 | Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
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 | ||
0050a760 | 30 | #include "gdb_proc_service.h" |
cdbfd419 | 31 | #include "../gdb_thread_db.h" |
0d62e5e8 | 32 | |
96f15937 | 33 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 34 | #include <dlfcn.h> |
96f15937 PP |
35 | #endif |
36 | ||
186947f7 | 37 | #include <stdint.h> |
cdbfd419 PP |
38 | #include <limits.h> |
39 | #include <ctype.h> | |
40 | ||
41 | struct thread_db | |
42 | { | |
43 | /* Structure that identifies the child process for the | |
44 | <proc_service.h> interface. */ | |
45 | struct ps_prochandle proc_handle; | |
46 | ||
47 | /* Connection to the libthread_db library. */ | |
48 | td_thragent_t *thread_agent; | |
49 | ||
96f15937 | 50 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 PP |
51 | /* Handle of the libthread_db from dlopen. */ |
52 | void *handle; | |
96f15937 | 53 | #endif |
cdbfd419 PP |
54 | |
55 | /* Addresses of libthread_db functions. */ | |
56 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, td_thragent_t **ta); | |
57 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
58 | td_event_msg_t *msg); | |
59 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
60 | td_thr_events_t *event); | |
61 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
62 | td_event_e event, td_notify_t *ptr); | |
63 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, | |
64 | td_thrhandle_t *th); | |
65 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
66 | td_thrinfo_t *infop); | |
67 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); | |
68 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
69 | td_thr_iter_f *callback, void *cbdata_p, | |
70 | td_thr_state_e state, int ti_pri, | |
71 | sigset_t *ti_sigmask_p, | |
72 | unsigned int ti_user_flags); | |
73 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
74 | psaddr_t map_address, |
75 | size_t offset, psaddr_t *address); | |
cdbfd419 PP |
76 | const char ** (*td_symbol_list_p) (void); |
77 | }; | |
78 | ||
79 | static char *libthread_db_search_path; | |
186947f7 | 80 | |
95954743 | 81 | static int find_one_thread (ptid_t); |
0d62e5e8 DJ |
82 | static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
83 | ||
54363045 | 84 | static const char * |
0d62e5e8 DJ |
85 | thread_db_err_str (td_err_e err) |
86 | { | |
87 | static char buf[64]; | |
88 | ||
89 | switch (err) | |
90 | { | |
91 | case TD_OK: | |
92 | return "generic 'call succeeded'"; | |
93 | case TD_ERR: | |
94 | return "generic error"; | |
95 | case TD_NOTHR: | |
96 | return "no thread to satisfy query"; | |
97 | case TD_NOSV: | |
98 | return "no sync handle to satisfy query"; | |
99 | case TD_NOLWP: | |
100 | return "no LWP to satisfy query"; | |
101 | case TD_BADPH: | |
102 | return "invalid process handle"; | |
103 | case TD_BADTH: | |
104 | return "invalid thread handle"; | |
105 | case TD_BADSH: | |
106 | return "invalid synchronization handle"; | |
107 | case TD_BADTA: | |
108 | return "invalid thread agent"; | |
109 | case TD_BADKEY: | |
110 | return "invalid key"; | |
111 | case TD_NOMSG: | |
112 | return "no event message for getmsg"; | |
113 | case TD_NOFPREGS: | |
114 | return "FPU register set not available"; | |
115 | case TD_NOLIBTHREAD: | |
116 | return "application not linked with libthread"; | |
117 | case TD_NOEVENT: | |
118 | return "requested event is not supported"; | |
119 | case TD_NOCAPAB: | |
120 | return "capability not available"; | |
121 | case TD_DBERR: | |
122 | return "debugger service failed"; | |
123 | case TD_NOAPLIC: | |
124 | return "operation not applicable to"; | |
125 | case TD_NOTSD: | |
126 | return "no thread-specific data for this thread"; | |
127 | case TD_MALLOC: | |
128 | return "malloc failed"; | |
129 | case TD_PARTIALREG: | |
130 | return "only part of register set was written/read"; | |
131 | case TD_NOXREGS: | |
132 | return "X register set not available for this thread"; | |
3db0444b DJ |
133 | #ifdef HAVE_TD_VERSION |
134 | case TD_VERSION: | |
135 | return "version mismatch between libthread_db and libpthread"; | |
136 | #endif | |
0d62e5e8 DJ |
137 | default: |
138 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
139 | return buf; | |
140 | } | |
141 | } | |
142 | ||
143 | #if 0 | |
144 | static char * | |
145 | thread_db_state_str (td_thr_state_e state) | |
146 | { | |
147 | static char buf[64]; | |
148 | ||
149 | switch (state) | |
150 | { | |
151 | case TD_THR_STOPPED: | |
152 | return "stopped by debugger"; | |
153 | case TD_THR_RUN: | |
154 | return "runnable"; | |
155 | case TD_THR_ACTIVE: | |
156 | return "active"; | |
157 | case TD_THR_ZOMBIE: | |
158 | return "zombie"; | |
159 | case TD_THR_SLEEP: | |
160 | return "sleeping"; | |
161 | case TD_THR_STOPPED_ASLEEP: | |
162 | return "stopped by debugger AND blocked"; | |
163 | default: | |
164 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
165 | return buf; | |
166 | } | |
167 | } | |
168 | #endif | |
169 | ||
b65d95c5 | 170 | static int |
0d62e5e8 DJ |
171 | thread_db_create_event (CORE_ADDR where) |
172 | { | |
173 | td_event_msg_t msg; | |
174 | td_err_e err; | |
54a0b537 | 175 | struct lwp_info *lwp; |
cdbfd419 PP |
176 | struct thread_db *thread_db = current_process ()->private->thread_db; |
177 | ||
178 | if (thread_db->td_ta_event_getmsg_p == NULL) | |
179 | fatal ("unexpected thread_db->td_ta_event_getmsg_p == NULL"); | |
0d62e5e8 DJ |
180 | |
181 | if (debug_threads) | |
182 | fprintf (stderr, "Thread creation event.\n"); | |
183 | ||
0d62e5e8 DJ |
184 | /* FIXME: This assumes we don't get another event. |
185 | In the LinuxThreads implementation, this is safe, | |
186 | because all events come from the manager thread | |
187 | (except for its own creation, of course). */ | |
cdbfd419 | 188 | err = thread_db->td_ta_event_getmsg_p (thread_db->thread_agent, &msg); |
0d62e5e8 DJ |
189 | if (err != TD_OK) |
190 | fprintf (stderr, "thread getmsg err: %s\n", | |
191 | thread_db_err_str (err)); | |
192 | ||
4105de34 DJ |
193 | /* If we do not know about the main thread yet, this would be a good time to |
194 | find it. We need to do this to pick up the main thread before any newly | |
195 | created threads. */ | |
54a0b537 PA |
196 | lwp = get_thread_lwp (current_inferior); |
197 | if (lwp->thread_known == 0) | |
95954743 | 198 | find_one_thread (lwp->head.id); |
4105de34 | 199 | |
0d62e5e8 DJ |
200 | /* msg.event == TD_EVENT_CREATE */ |
201 | ||
202 | find_new_threads_callback (msg.th_p, NULL); | |
b65d95c5 DJ |
203 | |
204 | return 0; | |
0d62e5e8 DJ |
205 | } |
206 | ||
0d62e5e8 DJ |
207 | static int |
208 | thread_db_enable_reporting () | |
209 | { | |
210 | td_thr_events_t events; | |
211 | td_notify_t notify; | |
212 | td_err_e err; | |
cdbfd419 PP |
213 | struct thread_db *thread_db = current_process ()->private->thread_db; |
214 | ||
215 | if (thread_db->td_ta_set_event_p == NULL | |
216 | || thread_db->td_ta_event_addr_p == NULL | |
217 | || thread_db->td_ta_event_getmsg_p == NULL) | |
218 | /* This libthread_db is missing required support. */ | |
219 | return 0; | |
0d62e5e8 DJ |
220 | |
221 | /* Set the process wide mask saying which events we're interested in. */ | |
222 | td_event_emptyset (&events); | |
223 | td_event_addset (&events, TD_CREATE); | |
224 | ||
cdbfd419 | 225 | err = thread_db->td_ta_set_event_p (thread_db->thread_agent, &events); |
0d62e5e8 DJ |
226 | if (err != TD_OK) |
227 | { | |
228 | warning ("Unable to set global thread event mask: %s", | |
1b3f6016 | 229 | thread_db_err_str (err)); |
0d62e5e8 DJ |
230 | return 0; |
231 | } | |
232 | ||
233 | /* Get address for thread creation breakpoint. */ | |
cdbfd419 PP |
234 | err = thread_db->td_ta_event_addr_p (thread_db->thread_agent, TD_CREATE, |
235 | ¬ify); | |
0d62e5e8 DJ |
236 | if (err != TD_OK) |
237 | { | |
238 | warning ("Unable to get location for thread creation breakpoint: %s", | |
239 | thread_db_err_str (err)); | |
240 | return 0; | |
241 | } | |
242 | set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, | |
243 | thread_db_create_event); | |
244 | ||
0d62e5e8 DJ |
245 | return 1; |
246 | } | |
247 | ||
ae13219e | 248 | static int |
95954743 | 249 | find_one_thread (ptid_t ptid) |
0d62e5e8 | 250 | { |
ae13219e DJ |
251 | td_thrhandle_t th; |
252 | td_thrinfo_t ti; | |
0d62e5e8 DJ |
253 | td_err_e err; |
254 | struct thread_info *inferior; | |
54a0b537 | 255 | struct lwp_info *lwp; |
cdbfd419 | 256 | struct thread_db *thread_db = current_process ()->private->thread_db; |
95954743 | 257 | int lwpid = ptid_get_lwp (ptid); |
0d62e5e8 | 258 | |
95954743 | 259 | inferior = (struct thread_info *) find_inferior_id (&all_threads, ptid); |
54a0b537 PA |
260 | lwp = get_thread_lwp (inferior); |
261 | if (lwp->thread_known) | |
ae13219e DJ |
262 | return 1; |
263 | ||
24a09b5f | 264 | /* Get information about this thread. */ |
cdbfd419 | 265 | err = thread_db->td_ta_map_lwp2thr_p (thread_db->thread_agent, lwpid, &th); |
ae13219e | 266 | if (err != TD_OK) |
24a09b5f DJ |
267 | error ("Cannot get thread handle for LWP %d: %s", |
268 | lwpid, thread_db_err_str (err)); | |
ae13219e | 269 | |
cdbfd419 | 270 | err = thread_db->td_thr_get_info_p (&th, &ti); |
ae13219e | 271 | if (err != TD_OK) |
24a09b5f DJ |
272 | error ("Cannot get thread info for LWP %d: %s", |
273 | lwpid, thread_db_err_str (err)); | |
ae13219e DJ |
274 | |
275 | if (debug_threads) | |
24a09b5f | 276 | fprintf (stderr, "Found thread %ld (LWP %d)\n", |
ae13219e DJ |
277 | ti.ti_tid, ti.ti_lid); |
278 | ||
95954743 | 279 | if (lwpid != ti.ti_lid) |
24a09b5f DJ |
280 | { |
281 | warning ("PID mismatch! Expected %ld, got %ld", | |
95954743 | 282 | (long) lwpid, (long) ti.ti_lid); |
24a09b5f DJ |
283 | return 0; |
284 | } | |
ae13219e | 285 | |
24a09b5f | 286 | if (thread_db_use_events) |
0d62e5e8 | 287 | { |
cdbfd419 | 288 | err = thread_db->td_thr_event_enable_p (&th, 1); |
ae13219e DJ |
289 | if (err != TD_OK) |
290 | error ("Cannot enable thread event reporting for %d: %s", | |
291 | ti.ti_lid, thread_db_err_str (err)); | |
0d62e5e8 | 292 | } |
ae13219e | 293 | |
24a09b5f DJ |
294 | /* If the new thread ID is zero, a final thread ID will be available |
295 | later. Do not enable thread debugging yet. */ | |
296 | if (ti.ti_tid == 0) | |
297 | return 0; | |
ae13219e | 298 | |
54a0b537 PA |
299 | lwp->thread_known = 1; |
300 | lwp->th = th; | |
ae13219e | 301 | |
ae13219e DJ |
302 | return 1; |
303 | } | |
304 | ||
5f7d1694 PP |
305 | /* Attach a thread. Return true on success. */ |
306 | ||
307 | static int | |
308 | attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p) | |
ae13219e | 309 | { |
54a0b537 | 310 | struct lwp_info *lwp; |
ae13219e | 311 | |
0d62e5e8 DJ |
312 | if (debug_threads) |
313 | fprintf (stderr, "Attaching to thread %ld (LWP %d)\n", | |
314 | ti_p->ti_tid, ti_p->ti_lid); | |
24a09b5f | 315 | linux_attach_lwp (ti_p->ti_lid); |
95954743 PA |
316 | lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); |
317 | if (lwp == NULL) | |
0d62e5e8 DJ |
318 | { |
319 | warning ("Could not attach to thread %ld (LWP %d)\n", | |
320 | ti_p->ti_tid, ti_p->ti_lid); | |
5f7d1694 | 321 | return 0; |
0d62e5e8 DJ |
322 | } |
323 | ||
54a0b537 PA |
324 | lwp->thread_known = 1; |
325 | lwp->th = *th_p; | |
24a09b5f DJ |
326 | |
327 | if (thread_db_use_events) | |
328 | { | |
5f7d1694 | 329 | td_err_e err; |
cdbfd419 | 330 | struct thread_db *thread_db = current_process ()->private->thread_db; |
5f7d1694 | 331 | |
cdbfd419 | 332 | err = thread_db->td_thr_event_enable_p (th_p, 1); |
24a09b5f DJ |
333 | if (err != TD_OK) |
334 | error ("Cannot enable thread event reporting for %d: %s", | |
335 | ti_p->ti_lid, thread_db_err_str (err)); | |
336 | } | |
5f7d1694 PP |
337 | |
338 | return 1; | |
339 | } | |
340 | ||
341 | /* Attach thread if we haven't seen it yet. | |
342 | Increment *COUNTER if we have attached a new thread. | |
343 | Return false on failure. */ | |
344 | ||
345 | static int | |
346 | maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p, | |
347 | int *counter) | |
348 | { | |
349 | struct lwp_info *lwp; | |
350 | ||
351 | lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); | |
352 | if (lwp != NULL) | |
353 | return 1; | |
354 | ||
355 | if (!attach_thread (th_p, ti_p)) | |
356 | return 0; | |
357 | ||
358 | if (counter != NULL) | |
359 | *counter += 1; | |
360 | ||
361 | return 1; | |
0d62e5e8 DJ |
362 | } |
363 | ||
364 | static int | |
365 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
366 | { | |
367 | td_thrinfo_t ti; | |
368 | td_err_e err; | |
cdbfd419 | 369 | struct thread_db *thread_db = current_process ()->private->thread_db; |
0d62e5e8 | 370 | |
cdbfd419 | 371 | err = thread_db->td_thr_get_info_p (th_p, &ti); |
0d62e5e8 DJ |
372 | if (err != TD_OK) |
373 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
374 | ||
375 | /* Check for zombies. */ | |
376 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) | |
377 | return 0; | |
378 | ||
5f7d1694 PP |
379 | if (!maybe_attach_thread (th_p, &ti, (int *) data)) |
380 | { | |
381 | /* Terminate iteration early: we might be looking at stale data in | |
382 | the inferior. The thread_db_find_new_threads will retry. */ | |
383 | return 1; | |
384 | } | |
0d62e5e8 DJ |
385 | |
386 | return 0; | |
387 | } | |
388 | ||
389 | static void | |
390 | thread_db_find_new_threads (void) | |
391 | { | |
392 | td_err_e err; | |
95954743 | 393 | ptid_t ptid = ((struct inferior_list_entry *) current_inferior)->id; |
cdbfd419 | 394 | struct thread_db *thread_db = current_process ()->private->thread_db; |
5f7d1694 | 395 | int loop, iteration; |
0d62e5e8 | 396 | |
ae13219e DJ |
397 | /* This function is only called when we first initialize thread_db. |
398 | First locate the initial thread. If it is not ready for | |
399 | debugging yet, then stop. */ | |
95954743 | 400 | if (find_one_thread (ptid) == 0) |
ae13219e DJ |
401 | return; |
402 | ||
5f7d1694 PP |
403 | /* Require 4 successive iterations which do not find any new threads. |
404 | The 4 is a heuristic: there is an inherent race here, and I have | |
405 | seen that 2 iterations in a row are not always sufficient to | |
406 | "capture" all threads. */ | |
407 | for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration) | |
408 | { | |
409 | int new_thread_count = 0; | |
410 | ||
411 | /* Iterate over all user-space threads to discover new threads. */ | |
412 | err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent, | |
413 | find_new_threads_callback, | |
414 | &new_thread_count, | |
415 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
416 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
417 | if (debug_threads) | |
418 | fprintf (stderr, "Found %d threads in iteration %d.\n", | |
419 | new_thread_count, iteration); | |
420 | ||
421 | if (new_thread_count != 0) | |
422 | { | |
423 | /* Found new threads. Restart iteration from beginning. */ | |
424 | loop = -1; | |
425 | } | |
426 | } | |
0d62e5e8 DJ |
427 | if (err != TD_OK) |
428 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
429 | } | |
430 | ||
fd500816 DJ |
431 | /* Cache all future symbols that thread_db might request. We can not |
432 | request symbols at arbitrary states in the remote protocol, only | |
433 | when the client tells us that new symbols are available. So when | |
434 | we load the thread library, make sure to check the entire list. */ | |
435 | ||
436 | static void | |
437 | thread_db_look_up_symbols (void) | |
438 | { | |
cdbfd419 PP |
439 | struct thread_db *thread_db = current_process ()->private->thread_db; |
440 | const char **sym_list; | |
fd500816 DJ |
441 | CORE_ADDR unused; |
442 | ||
cdbfd419 | 443 | for (sym_list = thread_db->td_symbol_list_p (); *sym_list; sym_list++) |
fd500816 DJ |
444 | look_up_one_symbol (*sym_list, &unused); |
445 | } | |
446 | ||
dae5f5cf DJ |
447 | int |
448 | thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, | |
449 | CORE_ADDR load_module, CORE_ADDR *address) | |
450 | { | |
dae5f5cf DJ |
451 | psaddr_t addr; |
452 | td_err_e err; | |
54a0b537 | 453 | struct lwp_info *lwp; |
95954743 | 454 | struct thread_info *saved_inferior; |
cdbfd419 PP |
455 | struct process_info *proc; |
456 | struct thread_db *thread_db; | |
457 | ||
458 | proc = get_thread_process (thread); | |
459 | thread_db = proc->private->thread_db; | |
dae5f5cf | 460 | |
7fe519cb | 461 | /* If the thread layer is not (yet) initialized, fail. */ |
cdbfd419 | 462 | if (!proc->all_symbols_looked_up) |
7fe519cb UW |
463 | return TD_ERR; |
464 | ||
cdbfd419 PP |
465 | if (thread_db->td_thr_tls_get_addr_p == NULL) |
466 | return -1; | |
467 | ||
54a0b537 PA |
468 | lwp = get_thread_lwp (thread); |
469 | if (!lwp->thread_known) | |
95954743 | 470 | find_one_thread (lwp->head.id); |
54a0b537 | 471 | if (!lwp->thread_known) |
dae5f5cf DJ |
472 | return TD_NOTHR; |
473 | ||
95954743 PA |
474 | saved_inferior = current_inferior; |
475 | current_inferior = thread; | |
186947f7 DJ |
476 | /* Note the cast through uintptr_t: this interface only works if |
477 | a target address fits in a psaddr_t, which is a host pointer. | |
478 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
cdbfd419 PP |
479 | err = thread_db->td_thr_tls_get_addr_p (&lwp->th, |
480 | (psaddr_t) (uintptr_t) load_module, | |
481 | offset, &addr); | |
95954743 | 482 | current_inferior = saved_inferior; |
dae5f5cf DJ |
483 | if (err == TD_OK) |
484 | { | |
186947f7 | 485 | *address = (CORE_ADDR) (uintptr_t) addr; |
dae5f5cf DJ |
486 | return 0; |
487 | } | |
488 | else | |
489 | return err; | |
cdbfd419 PP |
490 | } |
491 | ||
96f15937 PP |
492 | #ifdef USE_LIBTHREAD_DB_DIRECTLY |
493 | ||
494 | static int | |
495 | thread_db_load_search (void) | |
496 | { | |
497 | td_err_e err; | |
498 | struct thread_db tdb; | |
499 | struct process_info *proc = current_process (); | |
500 | ||
501 | if (proc->private->thread_db != NULL) | |
502 | fatal ("unexpected: proc->private->thread_db != NULL"); | |
503 | ||
504 | tdb.td_ta_new_p = &td_ta_new; | |
505 | ||
506 | /* Attempt to open a connection to the thread library. */ | |
507 | err = tdb.td_ta_new_p (&tdb.proc_handle, &tdb.thread_agent); | |
508 | if (err != TD_OK) | |
509 | { | |
510 | if (debug_threads) | |
511 | fprintf (stderr, "td_ta_new(): %s\n", thread_db_err_str (err)); | |
512 | return 0; | |
513 | } | |
514 | ||
515 | tdb.td_ta_map_lwp2thr_p = &td_ta_map_lwp2thr; | |
516 | tdb.td_thr_get_info_p = &td_thr_get_info; | |
517 | tdb.td_ta_thr_iter_p = &td_ta_thr_iter; | |
518 | tdb.td_symbol_list_p = &td_symbol_list; | |
519 | ||
520 | /* This is required only when thread_db_use_events is on. */ | |
521 | tdb.td_thr_event_enable_p = &td_thr_event_enable; | |
522 | ||
523 | /* These are not essential. */ | |
524 | tdb.td_ta_event_addr_p = &td_ta_event_addr; | |
525 | tdb.td_ta_set_event_p = &td_ta_set_event; | |
526 | tdb.td_ta_event_getmsg_p = &td_ta_event_getmsg; | |
527 | tdb.td_thr_tls_get_addr_p = &td_thr_tls_get_addr; | |
528 | ||
529 | proc->private->thread_db = xmalloc (sizeof (tdb)); | |
530 | memcpy (proc->private->thread_db, &tdb, sizeof (tdb)); | |
531 | ||
532 | return 1; | |
533 | } | |
534 | ||
535 | #else | |
536 | ||
cdbfd419 PP |
537 | static int |
538 | try_thread_db_load_1 (void *handle) | |
539 | { | |
540 | td_err_e err; | |
541 | struct thread_db tdb; | |
542 | struct process_info *proc = current_process (); | |
543 | ||
544 | if (proc->private->thread_db != NULL) | |
545 | fatal ("unexpected: proc->private->thread_db != NULL"); | |
546 | ||
547 | tdb.handle = handle; | |
548 | ||
549 | /* Initialize pointers to the dynamic library functions we will use. | |
550 | Essential functions first. */ | |
551 | ||
552 | #define CHK(required, a) \ | |
553 | do \ | |
554 | { \ | |
555 | if ((a) == NULL) \ | |
556 | { \ | |
557 | if (debug_threads) \ | |
558 | fprintf (stderr, "dlsym: %s\n", dlerror ()); \ | |
559 | if (required) \ | |
560 | return 0; \ | |
561 | } \ | |
562 | } \ | |
563 | while (0) | |
564 | ||
565 | CHK (1, tdb.td_ta_new_p = dlsym (handle, "td_ta_new")); | |
566 | ||
567 | /* Attempt to open a connection to the thread library. */ | |
568 | err = tdb.td_ta_new_p (&tdb.proc_handle, &tdb.thread_agent); | |
569 | if (err != TD_OK) | |
570 | { | |
571 | if (debug_threads) | |
572 | fprintf (stderr, "td_ta_new(): %s\n", thread_db_err_str (err)); | |
573 | return 0; | |
574 | } | |
575 | ||
576 | CHK (1, tdb.td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr")); | |
577 | CHK (1, tdb.td_thr_get_info_p = dlsym (handle, "td_thr_get_info")); | |
578 | CHK (1, tdb.td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter")); | |
579 | CHK (1, tdb.td_symbol_list_p = dlsym (handle, "td_symbol_list")); | |
580 | ||
581 | /* This is required only when thread_db_use_events is on. */ | |
582 | CHK (thread_db_use_events, | |
583 | tdb.td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable")); | |
584 | ||
585 | /* These are not essential. */ | |
586 | CHK (0, tdb.td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr")); | |
587 | CHK (0, tdb.td_ta_set_event_p = dlsym (handle, "td_ta_set_event")); | |
588 | CHK (0, tdb.td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg")); | |
589 | CHK (0, tdb.td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr")); | |
590 | ||
591 | #undef CHK | |
592 | ||
593 | proc->private->thread_db = xmalloc (sizeof (tdb)); | |
594 | memcpy (proc->private->thread_db, &tdb, sizeof (tdb)); | |
595 | ||
596 | return 1; | |
597 | } | |
598 | ||
10e86dd7 DE |
599 | #ifdef HAVE_DLADDR |
600 | ||
cdbfd419 PP |
601 | /* Lookup a library in which given symbol resides. |
602 | Note: this is looking in the GDBSERVER process, not in the inferior. | |
603 | Returns library name, or NULL. */ | |
604 | ||
605 | static const char * | |
606 | dladdr_to_soname (const void *addr) | |
607 | { | |
608 | Dl_info info; | |
609 | ||
610 | if (dladdr (addr, &info) != 0) | |
611 | return info.dli_fname; | |
612 | return NULL; | |
613 | } | |
614 | ||
10e86dd7 DE |
615 | #endif |
616 | ||
cdbfd419 PP |
617 | static int |
618 | try_thread_db_load (const char *library) | |
619 | { | |
620 | void *handle; | |
621 | ||
622 | if (debug_threads) | |
623 | fprintf (stderr, "Trying host libthread_db library: %s.\n", | |
624 | library); | |
625 | handle = dlopen (library, RTLD_NOW); | |
626 | if (handle == NULL) | |
627 | { | |
628 | if (debug_threads) | |
629 | fprintf (stderr, "dlopen failed: %s.\n", dlerror ()); | |
630 | return 0; | |
631 | } | |
632 | ||
10e86dd7 | 633 | #ifdef HAVE_DLADDR |
cdbfd419 PP |
634 | if (debug_threads && strchr (library, '/') == NULL) |
635 | { | |
636 | void *td_init; | |
637 | ||
638 | td_init = dlsym (handle, "td_init"); | |
639 | if (td_init != NULL) | |
640 | { | |
641 | const char *const libpath = dladdr_to_soname (td_init); | |
642 | ||
643 | if (libpath != NULL) | |
644 | fprintf (stderr, "Host %s resolved to: %s.\n", | |
645 | library, libpath); | |
646 | } | |
647 | } | |
10e86dd7 | 648 | #endif |
cdbfd419 PP |
649 | |
650 | if (try_thread_db_load_1 (handle)) | |
651 | return 1; | |
652 | ||
653 | /* This library "refused" to work on current inferior. */ | |
654 | dlclose (handle); | |
655 | return 0; | |
656 | } | |
657 | ||
658 | static int | |
659 | thread_db_load_search (void) | |
660 | { | |
661 | char path[PATH_MAX]; | |
662 | const char *search_path; | |
663 | int rc = 0; | |
664 | ||
665 | if (libthread_db_search_path == NULL) | |
666 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
667 | ||
668 | search_path = libthread_db_search_path; | |
669 | while (*search_path) | |
670 | { | |
671 | const char *end = strchr (search_path, ':'); | |
672 | if (end) | |
673 | { | |
674 | size_t len = end - search_path; | |
675 | if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
676 | { | |
677 | char *cp = xmalloc (len + 1); | |
678 | memcpy (cp, search_path, len); | |
679 | cp[len] = '\0'; | |
680 | warning ("libthread_db_search_path component too long, " | |
681 | "ignored: %s.", cp); | |
682 | free (cp); | |
683 | search_path += len + 1; | |
684 | continue; | |
685 | } | |
686 | memcpy (path, search_path, len); | |
687 | path[len] = '\0'; | |
688 | search_path += len + 1; | |
689 | } | |
690 | else | |
691 | { | |
692 | size_t len = strlen (search_path); | |
693 | ||
694 | if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
695 | { | |
696 | warning ("libthread_db_search_path component too long," | |
697 | " ignored: %s.", search_path); | |
698 | break; | |
699 | } | |
700 | memcpy (path, search_path, len + 1); | |
701 | search_path += len; | |
702 | } | |
703 | strcat (path, "/"); | |
704 | strcat (path, LIBTHREAD_DB_SO); | |
705 | if (debug_threads) | |
706 | fprintf (stderr, "thread_db_load_search trying %s\n", path); | |
707 | if (try_thread_db_load (path)) | |
708 | { | |
709 | rc = 1; | |
710 | break; | |
711 | } | |
712 | } | |
713 | if (rc == 0) | |
714 | rc = try_thread_db_load (LIBTHREAD_DB_SO); | |
715 | ||
716 | if (debug_threads) | |
717 | fprintf (stderr, "thread_db_load_search returning %d\n", rc); | |
718 | return rc; | |
dae5f5cf DJ |
719 | } |
720 | ||
96f15937 PP |
721 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
722 | ||
0d62e5e8 | 723 | int |
24a09b5f | 724 | thread_db_init (int use_events) |
0d62e5e8 | 725 | { |
95954743 | 726 | struct process_info *proc = current_process (); |
0d62e5e8 | 727 | |
fd500816 DJ |
728 | /* FIXME drow/2004-10-16: This is the "overall process ID", which |
729 | GNU/Linux calls tgid, "thread group ID". When we support | |
730 | attaching to threads, the original thread may not be the correct | |
731 | thread. We would have to get the process ID from /proc for NPTL. | |
732 | For LinuxThreads we could do something similar: follow the chain | |
733 | of parent processes until we find the highest one we're attached | |
734 | to, and use its tgid. | |
735 | ||
736 | This isn't the only place in gdbserver that assumes that the first | |
737 | process in the list is the thread group leader. */ | |
ea025f5f | 738 | |
24a09b5f DJ |
739 | thread_db_use_events = use_events; |
740 | ||
cdbfd419 | 741 | if (thread_db_load_search ()) |
0d62e5e8 | 742 | { |
24a09b5f | 743 | if (use_events && thread_db_enable_reporting () == 0) |
cdbfd419 PP |
744 | { |
745 | /* Keep trying; maybe event reporting will work later. */ | |
8336d594 | 746 | thread_db_mourn (proc); |
cdbfd419 PP |
747 | return 0; |
748 | } | |
0d62e5e8 | 749 | thread_db_find_new_threads (); |
fd500816 | 750 | thread_db_look_up_symbols (); |
95954743 | 751 | proc->all_symbols_looked_up = 1; |
0d62e5e8 | 752 | return 1; |
cdbfd419 | 753 | } |
0d62e5e8 | 754 | |
cdbfd419 PP |
755 | return 0; |
756 | } | |
757 | ||
ca5c370d PA |
758 | static int |
759 | any_thread_of (struct inferior_list_entry *entry, void *args) | |
760 | { | |
761 | int *pid_p = args; | |
762 | ||
763 | if (ptid_get_pid (entry->id) == *pid_p) | |
764 | return 1; | |
765 | ||
766 | return 0; | |
767 | } | |
768 | ||
cdbfd419 PP |
769 | /* Disconnect from libthread_db and free resources. */ |
770 | ||
8336d594 PA |
771 | static void |
772 | disable_thread_event_reporting (struct process_info *proc) | |
cdbfd419 PP |
773 | { |
774 | struct thread_db *thread_db = proc->private->thread_db; | |
775 | if (thread_db) | |
776 | { | |
21e1bee4 PP |
777 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
778 | td_thr_events_t *event); | |
779 | ||
fd7dd3e6 | 780 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
21e1bee4 | 781 | td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event"); |
fd7dd3e6 | 782 | #else |
fd7dd3e6 PA |
783 | td_ta_clear_event_p = &td_ta_clear_event; |
784 | #endif | |
785 | ||
8336d594 | 786 | if (td_ta_clear_event_p != NULL) |
21e1bee4 | 787 | { |
8336d594 | 788 | struct thread_info *saved_inferior; |
21e1bee4 | 789 | td_thr_events_t events; |
8336d594 PA |
790 | int pid; |
791 | ||
792 | pid = pid_of (proc); | |
793 | saved_inferior = current_inferior; | |
794 | current_inferior = | |
795 | (struct thread_info *) find_inferior (&all_threads, | |
796 | any_thread_of, &pid); | |
21e1bee4 | 797 | |
fd7dd3e6 PA |
798 | /* Set the process wide mask saying we aren't interested |
799 | in any events anymore. */ | |
21e1bee4 PP |
800 | td_event_fillset (&events); |
801 | (*td_ta_clear_event_p) (thread_db->thread_agent, &events); | |
8336d594 PA |
802 | |
803 | current_inferior = saved_inferior; | |
21e1bee4 | 804 | } |
8336d594 PA |
805 | } |
806 | } | |
807 | ||
808 | void | |
809 | thread_db_detach (struct process_info *proc) | |
810 | { | |
811 | disable_thread_event_reporting (proc); | |
812 | } | |
813 | ||
814 | /* Disconnect from libthread_db and free resources. */ | |
815 | ||
816 | void | |
817 | thread_db_mourn (struct process_info *proc) | |
818 | { | |
819 | struct thread_db *thread_db = proc->private->thread_db; | |
820 | if (thread_db) | |
821 | { | |
822 | td_err_e (*td_ta_delete_p) (td_thragent_t *); | |
823 | ||
824 | #ifndef USE_LIBTHREAD_DB_DIRECTLY | |
825 | td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete"); | |
826 | #else | |
827 | td_ta_delete_p = &td_ta_delete; | |
828 | #endif | |
cdbfd419 | 829 | |
cdbfd419 PP |
830 | if (td_ta_delete_p != NULL) |
831 | (*td_ta_delete_p) (thread_db->thread_agent); | |
832 | ||
fd7dd3e6 | 833 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 834 | dlclose (thread_db->handle); |
96f15937 PP |
835 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
836 | ||
cdbfd419 PP |
837 | free (thread_db); |
838 | proc->private->thread_db = NULL; | |
839 | } | |
840 | } | |
841 | ||
842 | /* Handle "set libthread-db-search-path" monitor command and return 1. | |
843 | For any other command, return 0. */ | |
844 | ||
845 | int | |
846 | thread_db_handle_monitor_command (char *mon) | |
847 | { | |
848 | if (strncmp (mon, "set libthread-db-search-path ", 29) == 0) | |
849 | { | |
850 | const char *cp = mon + 29; | |
851 | ||
852 | if (libthread_db_search_path != NULL) | |
853 | free (libthread_db_search_path); | |
854 | ||
855 | /* Skip leading space (if any). */ | |
856 | while (isspace (*cp)) | |
857 | ++cp; | |
858 | ||
859 | libthread_db_search_path = xstrdup (cp); | |
860 | ||
861 | monitor_output ("libthread-db-search-path set to `"); | |
862 | monitor_output (libthread_db_search_path); | |
863 | monitor_output ("'\n"); | |
864 | return 1; | |
0d62e5e8 DJ |
865 | } |
866 | ||
cdbfd419 | 867 | /* Tell server.c to perform default processing. */ |
0d62e5e8 DJ |
868 | return 0; |
869 | } |