Commit | Line | Data |
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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 | 54 | |
f9e39928 PA |
55 | /* Thread creation event breakpoint. The code at this location in |
56 | the child process will be called by the pthread library whenever | |
57 | a new thread is created. By setting a special breakpoint at this | |
58 | location, GDB can detect when a new thread is created. We obtain | |
59 | this location via the td_ta_event_addr call. Note that if the | |
60 | running kernel supports tracing clones, then we don't need to use | |
61 | (and in fact don't use) this magic thread event breakpoint to | |
62 | learn about threads. */ | |
63 | struct breakpoint *td_create_bp; | |
64 | ||
cdbfd419 PP |
65 | /* Addresses of libthread_db functions. */ |
66 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, td_thragent_t **ta); | |
67 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
68 | td_event_msg_t *msg); | |
69 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
70 | td_thr_events_t *event); | |
71 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
72 | td_event_e event, td_notify_t *ptr); | |
73 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, | |
74 | td_thrhandle_t *th); | |
75 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
76 | td_thrinfo_t *infop); | |
77 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); | |
78 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
79 | td_thr_iter_f *callback, void *cbdata_p, | |
80 | td_thr_state_e state, int ti_pri, | |
81 | sigset_t *ti_sigmask_p, | |
82 | unsigned int ti_user_flags); | |
83 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
84 | psaddr_t map_address, |
85 | size_t offset, psaddr_t *address); | |
cdbfd419 PP |
86 | const char ** (*td_symbol_list_p) (void); |
87 | }; | |
88 | ||
89 | static char *libthread_db_search_path; | |
186947f7 | 90 | |
95954743 | 91 | static int find_one_thread (ptid_t); |
0d62e5e8 DJ |
92 | static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
93 | ||
54363045 | 94 | static const char * |
0d62e5e8 DJ |
95 | thread_db_err_str (td_err_e err) |
96 | { | |
97 | static char buf[64]; | |
98 | ||
99 | switch (err) | |
100 | { | |
101 | case TD_OK: | |
102 | return "generic 'call succeeded'"; | |
103 | case TD_ERR: | |
104 | return "generic error"; | |
105 | case TD_NOTHR: | |
106 | return "no thread to satisfy query"; | |
107 | case TD_NOSV: | |
108 | return "no sync handle to satisfy query"; | |
109 | case TD_NOLWP: | |
110 | return "no LWP to satisfy query"; | |
111 | case TD_BADPH: | |
112 | return "invalid process handle"; | |
113 | case TD_BADTH: | |
114 | return "invalid thread handle"; | |
115 | case TD_BADSH: | |
116 | return "invalid synchronization handle"; | |
117 | case TD_BADTA: | |
118 | return "invalid thread agent"; | |
119 | case TD_BADKEY: | |
120 | return "invalid key"; | |
121 | case TD_NOMSG: | |
122 | return "no event message for getmsg"; | |
123 | case TD_NOFPREGS: | |
124 | return "FPU register set not available"; | |
125 | case TD_NOLIBTHREAD: | |
126 | return "application not linked with libthread"; | |
127 | case TD_NOEVENT: | |
128 | return "requested event is not supported"; | |
129 | case TD_NOCAPAB: | |
130 | return "capability not available"; | |
131 | case TD_DBERR: | |
132 | return "debugger service failed"; | |
133 | case TD_NOAPLIC: | |
134 | return "operation not applicable to"; | |
135 | case TD_NOTSD: | |
136 | return "no thread-specific data for this thread"; | |
137 | case TD_MALLOC: | |
138 | return "malloc failed"; | |
139 | case TD_PARTIALREG: | |
140 | return "only part of register set was written/read"; | |
141 | case TD_NOXREGS: | |
142 | return "X register set not available for this thread"; | |
3db0444b DJ |
143 | #ifdef HAVE_TD_VERSION |
144 | case TD_VERSION: | |
145 | return "version mismatch between libthread_db and libpthread"; | |
146 | #endif | |
0d62e5e8 DJ |
147 | default: |
148 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
149 | return buf; | |
150 | } | |
151 | } | |
152 | ||
153 | #if 0 | |
154 | static char * | |
155 | thread_db_state_str (td_thr_state_e state) | |
156 | { | |
157 | static char buf[64]; | |
158 | ||
159 | switch (state) | |
160 | { | |
161 | case TD_THR_STOPPED: | |
162 | return "stopped by debugger"; | |
163 | case TD_THR_RUN: | |
164 | return "runnable"; | |
165 | case TD_THR_ACTIVE: | |
166 | return "active"; | |
167 | case TD_THR_ZOMBIE: | |
168 | return "zombie"; | |
169 | case TD_THR_SLEEP: | |
170 | return "sleeping"; | |
171 | case TD_THR_STOPPED_ASLEEP: | |
172 | return "stopped by debugger AND blocked"; | |
173 | default: | |
174 | snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); | |
175 | return buf; | |
176 | } | |
177 | } | |
178 | #endif | |
179 | ||
b65d95c5 | 180 | static int |
0d62e5e8 DJ |
181 | thread_db_create_event (CORE_ADDR where) |
182 | { | |
183 | td_event_msg_t msg; | |
184 | td_err_e err; | |
54a0b537 | 185 | struct lwp_info *lwp; |
cdbfd419 PP |
186 | struct thread_db *thread_db = current_process ()->private->thread_db; |
187 | ||
188 | if (thread_db->td_ta_event_getmsg_p == NULL) | |
189 | fatal ("unexpected thread_db->td_ta_event_getmsg_p == NULL"); | |
0d62e5e8 DJ |
190 | |
191 | if (debug_threads) | |
192 | fprintf (stderr, "Thread creation event.\n"); | |
193 | ||
0d62e5e8 DJ |
194 | /* FIXME: This assumes we don't get another event. |
195 | In the LinuxThreads implementation, this is safe, | |
196 | because all events come from the manager thread | |
197 | (except for its own creation, of course). */ | |
cdbfd419 | 198 | err = thread_db->td_ta_event_getmsg_p (thread_db->thread_agent, &msg); |
0d62e5e8 DJ |
199 | if (err != TD_OK) |
200 | fprintf (stderr, "thread getmsg err: %s\n", | |
201 | thread_db_err_str (err)); | |
202 | ||
4105de34 DJ |
203 | /* If we do not know about the main thread yet, this would be a good time to |
204 | find it. We need to do this to pick up the main thread before any newly | |
205 | created threads. */ | |
54a0b537 PA |
206 | lwp = get_thread_lwp (current_inferior); |
207 | if (lwp->thread_known == 0) | |
95954743 | 208 | find_one_thread (lwp->head.id); |
4105de34 | 209 | |
0d62e5e8 DJ |
210 | /* msg.event == TD_EVENT_CREATE */ |
211 | ||
212 | find_new_threads_callback (msg.th_p, NULL); | |
b65d95c5 DJ |
213 | |
214 | return 0; | |
0d62e5e8 DJ |
215 | } |
216 | ||
0d62e5e8 | 217 | static int |
f9e39928 | 218 | thread_db_enable_reporting (void) |
0d62e5e8 DJ |
219 | { |
220 | td_thr_events_t events; | |
221 | td_notify_t notify; | |
222 | td_err_e err; | |
cdbfd419 PP |
223 | struct thread_db *thread_db = current_process ()->private->thread_db; |
224 | ||
225 | if (thread_db->td_ta_set_event_p == NULL | |
226 | || thread_db->td_ta_event_addr_p == NULL | |
227 | || thread_db->td_ta_event_getmsg_p == NULL) | |
228 | /* This libthread_db is missing required support. */ | |
229 | return 0; | |
0d62e5e8 DJ |
230 | |
231 | /* Set the process wide mask saying which events we're interested in. */ | |
232 | td_event_emptyset (&events); | |
233 | td_event_addset (&events, TD_CREATE); | |
234 | ||
cdbfd419 | 235 | err = thread_db->td_ta_set_event_p (thread_db->thread_agent, &events); |
0d62e5e8 DJ |
236 | if (err != TD_OK) |
237 | { | |
238 | warning ("Unable to set global thread event mask: %s", | |
1b3f6016 | 239 | thread_db_err_str (err)); |
0d62e5e8 DJ |
240 | return 0; |
241 | } | |
242 | ||
243 | /* Get address for thread creation breakpoint. */ | |
cdbfd419 PP |
244 | err = thread_db->td_ta_event_addr_p (thread_db->thread_agent, TD_CREATE, |
245 | ¬ify); | |
0d62e5e8 DJ |
246 | if (err != TD_OK) |
247 | { | |
248 | warning ("Unable to get location for thread creation breakpoint: %s", | |
249 | thread_db_err_str (err)); | |
250 | return 0; | |
251 | } | |
f9e39928 PA |
252 | thread_db->td_create_bp |
253 | = set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, | |
254 | thread_db_create_event); | |
0d62e5e8 | 255 | |
0d62e5e8 DJ |
256 | return 1; |
257 | } | |
258 | ||
ae13219e | 259 | static int |
95954743 | 260 | find_one_thread (ptid_t ptid) |
0d62e5e8 | 261 | { |
ae13219e DJ |
262 | td_thrhandle_t th; |
263 | td_thrinfo_t ti; | |
0d62e5e8 DJ |
264 | td_err_e err; |
265 | struct thread_info *inferior; | |
54a0b537 | 266 | struct lwp_info *lwp; |
cdbfd419 | 267 | struct thread_db *thread_db = current_process ()->private->thread_db; |
95954743 | 268 | int lwpid = ptid_get_lwp (ptid); |
0d62e5e8 | 269 | |
95954743 | 270 | inferior = (struct thread_info *) find_inferior_id (&all_threads, ptid); |
54a0b537 PA |
271 | lwp = get_thread_lwp (inferior); |
272 | if (lwp->thread_known) | |
ae13219e DJ |
273 | return 1; |
274 | ||
24a09b5f | 275 | /* Get information about this thread. */ |
cdbfd419 | 276 | err = thread_db->td_ta_map_lwp2thr_p (thread_db->thread_agent, lwpid, &th); |
ae13219e | 277 | if (err != TD_OK) |
24a09b5f DJ |
278 | error ("Cannot get thread handle for LWP %d: %s", |
279 | lwpid, thread_db_err_str (err)); | |
ae13219e | 280 | |
cdbfd419 | 281 | err = thread_db->td_thr_get_info_p (&th, &ti); |
ae13219e | 282 | if (err != TD_OK) |
24a09b5f DJ |
283 | error ("Cannot get thread info for LWP %d: %s", |
284 | lwpid, thread_db_err_str (err)); | |
ae13219e DJ |
285 | |
286 | if (debug_threads) | |
24a09b5f | 287 | fprintf (stderr, "Found thread %ld (LWP %d)\n", |
ae13219e DJ |
288 | ti.ti_tid, ti.ti_lid); |
289 | ||
95954743 | 290 | if (lwpid != ti.ti_lid) |
24a09b5f DJ |
291 | { |
292 | warning ("PID mismatch! Expected %ld, got %ld", | |
95954743 | 293 | (long) lwpid, (long) ti.ti_lid); |
24a09b5f DJ |
294 | return 0; |
295 | } | |
ae13219e | 296 | |
24a09b5f | 297 | if (thread_db_use_events) |
0d62e5e8 | 298 | { |
cdbfd419 | 299 | err = thread_db->td_thr_event_enable_p (&th, 1); |
ae13219e DJ |
300 | if (err != TD_OK) |
301 | error ("Cannot enable thread event reporting for %d: %s", | |
302 | ti.ti_lid, thread_db_err_str (err)); | |
0d62e5e8 | 303 | } |
ae13219e | 304 | |
24a09b5f DJ |
305 | /* If the new thread ID is zero, a final thread ID will be available |
306 | later. Do not enable thread debugging yet. */ | |
307 | if (ti.ti_tid == 0) | |
308 | return 0; | |
ae13219e | 309 | |
54a0b537 PA |
310 | lwp->thread_known = 1; |
311 | lwp->th = th; | |
ae13219e | 312 | |
ae13219e DJ |
313 | return 1; |
314 | } | |
315 | ||
5f7d1694 PP |
316 | /* Attach a thread. Return true on success. */ |
317 | ||
318 | static int | |
319 | attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p) | |
ae13219e | 320 | { |
54a0b537 | 321 | struct lwp_info *lwp; |
ae13219e | 322 | |
0d62e5e8 DJ |
323 | if (debug_threads) |
324 | fprintf (stderr, "Attaching to thread %ld (LWP %d)\n", | |
325 | ti_p->ti_tid, ti_p->ti_lid); | |
24a09b5f | 326 | linux_attach_lwp (ti_p->ti_lid); |
95954743 PA |
327 | lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); |
328 | if (lwp == NULL) | |
0d62e5e8 DJ |
329 | { |
330 | warning ("Could not attach to thread %ld (LWP %d)\n", | |
331 | ti_p->ti_tid, ti_p->ti_lid); | |
5f7d1694 | 332 | return 0; |
0d62e5e8 DJ |
333 | } |
334 | ||
54a0b537 PA |
335 | lwp->thread_known = 1; |
336 | lwp->th = *th_p; | |
24a09b5f DJ |
337 | |
338 | if (thread_db_use_events) | |
339 | { | |
5f7d1694 | 340 | td_err_e err; |
cdbfd419 | 341 | struct thread_db *thread_db = current_process ()->private->thread_db; |
5f7d1694 | 342 | |
cdbfd419 | 343 | err = thread_db->td_thr_event_enable_p (th_p, 1); |
24a09b5f DJ |
344 | if (err != TD_OK) |
345 | error ("Cannot enable thread event reporting for %d: %s", | |
346 | ti_p->ti_lid, thread_db_err_str (err)); | |
347 | } | |
5f7d1694 PP |
348 | |
349 | return 1; | |
350 | } | |
351 | ||
352 | /* Attach thread if we haven't seen it yet. | |
353 | Increment *COUNTER if we have attached a new thread. | |
354 | Return false on failure. */ | |
355 | ||
356 | static int | |
357 | maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p, | |
358 | int *counter) | |
359 | { | |
360 | struct lwp_info *lwp; | |
361 | ||
362 | lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); | |
363 | if (lwp != NULL) | |
364 | return 1; | |
365 | ||
366 | if (!attach_thread (th_p, ti_p)) | |
367 | return 0; | |
368 | ||
369 | if (counter != NULL) | |
370 | *counter += 1; | |
371 | ||
372 | return 1; | |
0d62e5e8 DJ |
373 | } |
374 | ||
375 | static int | |
376 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
377 | { | |
378 | td_thrinfo_t ti; | |
379 | td_err_e err; | |
cdbfd419 | 380 | struct thread_db *thread_db = current_process ()->private->thread_db; |
0d62e5e8 | 381 | |
cdbfd419 | 382 | err = thread_db->td_thr_get_info_p (th_p, &ti); |
0d62e5e8 DJ |
383 | if (err != TD_OK) |
384 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
385 | ||
386 | /* Check for zombies. */ | |
387 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) | |
388 | return 0; | |
389 | ||
5f7d1694 PP |
390 | if (!maybe_attach_thread (th_p, &ti, (int *) data)) |
391 | { | |
392 | /* Terminate iteration early: we might be looking at stale data in | |
393 | the inferior. The thread_db_find_new_threads will retry. */ | |
394 | return 1; | |
395 | } | |
0d62e5e8 DJ |
396 | |
397 | return 0; | |
398 | } | |
399 | ||
400 | static void | |
401 | thread_db_find_new_threads (void) | |
402 | { | |
403 | td_err_e err; | |
95954743 | 404 | ptid_t ptid = ((struct inferior_list_entry *) current_inferior)->id; |
cdbfd419 | 405 | struct thread_db *thread_db = current_process ()->private->thread_db; |
5f7d1694 | 406 | int loop, iteration; |
0d62e5e8 | 407 | |
ae13219e DJ |
408 | /* This function is only called when we first initialize thread_db. |
409 | First locate the initial thread. If it is not ready for | |
410 | debugging yet, then stop. */ | |
95954743 | 411 | if (find_one_thread (ptid) == 0) |
ae13219e DJ |
412 | return; |
413 | ||
5f7d1694 PP |
414 | /* Require 4 successive iterations which do not find any new threads. |
415 | The 4 is a heuristic: there is an inherent race here, and I have | |
416 | seen that 2 iterations in a row are not always sufficient to | |
417 | "capture" all threads. */ | |
418 | for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration) | |
419 | { | |
420 | int new_thread_count = 0; | |
421 | ||
422 | /* Iterate over all user-space threads to discover new threads. */ | |
423 | err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent, | |
424 | find_new_threads_callback, | |
425 | &new_thread_count, | |
426 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
427 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
428 | if (debug_threads) | |
429 | fprintf (stderr, "Found %d threads in iteration %d.\n", | |
430 | new_thread_count, iteration); | |
431 | ||
432 | if (new_thread_count != 0) | |
433 | { | |
434 | /* Found new threads. Restart iteration from beginning. */ | |
435 | loop = -1; | |
436 | } | |
437 | } | |
0d62e5e8 DJ |
438 | if (err != TD_OK) |
439 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
440 | } | |
441 | ||
fd500816 DJ |
442 | /* Cache all future symbols that thread_db might request. We can not |
443 | request symbols at arbitrary states in the remote protocol, only | |
444 | when the client tells us that new symbols are available. So when | |
445 | we load the thread library, make sure to check the entire list. */ | |
446 | ||
447 | static void | |
448 | thread_db_look_up_symbols (void) | |
449 | { | |
cdbfd419 PP |
450 | struct thread_db *thread_db = current_process ()->private->thread_db; |
451 | const char **sym_list; | |
fd500816 DJ |
452 | CORE_ADDR unused; |
453 | ||
cdbfd419 | 454 | for (sym_list = thread_db->td_symbol_list_p (); *sym_list; sym_list++) |
fd500816 DJ |
455 | look_up_one_symbol (*sym_list, &unused); |
456 | } | |
457 | ||
dae5f5cf DJ |
458 | int |
459 | thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, | |
460 | CORE_ADDR load_module, CORE_ADDR *address) | |
461 | { | |
dae5f5cf DJ |
462 | psaddr_t addr; |
463 | td_err_e err; | |
54a0b537 | 464 | struct lwp_info *lwp; |
95954743 | 465 | struct thread_info *saved_inferior; |
cdbfd419 PP |
466 | struct process_info *proc; |
467 | struct thread_db *thread_db; | |
468 | ||
469 | proc = get_thread_process (thread); | |
470 | thread_db = proc->private->thread_db; | |
dae5f5cf | 471 | |
7fe519cb | 472 | /* If the thread layer is not (yet) initialized, fail. */ |
cdbfd419 | 473 | if (!proc->all_symbols_looked_up) |
7fe519cb UW |
474 | return TD_ERR; |
475 | ||
cdbfd419 PP |
476 | if (thread_db->td_thr_tls_get_addr_p == NULL) |
477 | return -1; | |
478 | ||
54a0b537 PA |
479 | lwp = get_thread_lwp (thread); |
480 | if (!lwp->thread_known) | |
95954743 | 481 | find_one_thread (lwp->head.id); |
54a0b537 | 482 | if (!lwp->thread_known) |
dae5f5cf DJ |
483 | return TD_NOTHR; |
484 | ||
95954743 PA |
485 | saved_inferior = current_inferior; |
486 | current_inferior = thread; | |
186947f7 DJ |
487 | /* Note the cast through uintptr_t: this interface only works if |
488 | a target address fits in a psaddr_t, which is a host pointer. | |
489 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
cdbfd419 PP |
490 | err = thread_db->td_thr_tls_get_addr_p (&lwp->th, |
491 | (psaddr_t) (uintptr_t) load_module, | |
492 | offset, &addr); | |
95954743 | 493 | current_inferior = saved_inferior; |
dae5f5cf DJ |
494 | if (err == TD_OK) |
495 | { | |
186947f7 | 496 | *address = (CORE_ADDR) (uintptr_t) addr; |
dae5f5cf DJ |
497 | return 0; |
498 | } | |
499 | else | |
500 | return err; | |
cdbfd419 PP |
501 | } |
502 | ||
96f15937 PP |
503 | #ifdef USE_LIBTHREAD_DB_DIRECTLY |
504 | ||
505 | static int | |
506 | thread_db_load_search (void) | |
507 | { | |
508 | td_err_e err; | |
509 | struct thread_db tdb; | |
510 | struct process_info *proc = current_process (); | |
511 | ||
512 | if (proc->private->thread_db != NULL) | |
513 | fatal ("unexpected: proc->private->thread_db != NULL"); | |
514 | ||
f9e39928 PA |
515 | memset (&tdb, 0, sizeof (tdb)); |
516 | ||
96f15937 PP |
517 | tdb.td_ta_new_p = &td_ta_new; |
518 | ||
519 | /* Attempt to open a connection to the thread library. */ | |
520 | err = tdb.td_ta_new_p (&tdb.proc_handle, &tdb.thread_agent); | |
521 | if (err != TD_OK) | |
522 | { | |
523 | if (debug_threads) | |
524 | fprintf (stderr, "td_ta_new(): %s\n", thread_db_err_str (err)); | |
525 | return 0; | |
526 | } | |
527 | ||
528 | tdb.td_ta_map_lwp2thr_p = &td_ta_map_lwp2thr; | |
529 | tdb.td_thr_get_info_p = &td_thr_get_info; | |
530 | tdb.td_ta_thr_iter_p = &td_ta_thr_iter; | |
531 | tdb.td_symbol_list_p = &td_symbol_list; | |
532 | ||
533 | /* This is required only when thread_db_use_events is on. */ | |
534 | tdb.td_thr_event_enable_p = &td_thr_event_enable; | |
535 | ||
536 | /* These are not essential. */ | |
537 | tdb.td_ta_event_addr_p = &td_ta_event_addr; | |
538 | tdb.td_ta_set_event_p = &td_ta_set_event; | |
539 | tdb.td_ta_event_getmsg_p = &td_ta_event_getmsg; | |
540 | tdb.td_thr_tls_get_addr_p = &td_thr_tls_get_addr; | |
541 | ||
542 | proc->private->thread_db = xmalloc (sizeof (tdb)); | |
543 | memcpy (proc->private->thread_db, &tdb, sizeof (tdb)); | |
544 | ||
545 | return 1; | |
546 | } | |
547 | ||
548 | #else | |
549 | ||
cdbfd419 PP |
550 | static int |
551 | try_thread_db_load_1 (void *handle) | |
552 | { | |
553 | td_err_e err; | |
554 | struct thread_db tdb; | |
555 | struct process_info *proc = current_process (); | |
556 | ||
557 | if (proc->private->thread_db != NULL) | |
558 | fatal ("unexpected: proc->private->thread_db != NULL"); | |
559 | ||
f9e39928 PA |
560 | memset (&tdb, 0, sizeof (tdb)); |
561 | ||
cdbfd419 PP |
562 | tdb.handle = handle; |
563 | ||
564 | /* Initialize pointers to the dynamic library functions we will use. | |
565 | Essential functions first. */ | |
566 | ||
567 | #define CHK(required, a) \ | |
568 | do \ | |
569 | { \ | |
570 | if ((a) == NULL) \ | |
571 | { \ | |
572 | if (debug_threads) \ | |
573 | fprintf (stderr, "dlsym: %s\n", dlerror ()); \ | |
574 | if (required) \ | |
575 | return 0; \ | |
576 | } \ | |
577 | } \ | |
578 | while (0) | |
579 | ||
580 | CHK (1, tdb.td_ta_new_p = dlsym (handle, "td_ta_new")); | |
581 | ||
582 | /* Attempt to open a connection to the thread library. */ | |
583 | err = tdb.td_ta_new_p (&tdb.proc_handle, &tdb.thread_agent); | |
584 | if (err != TD_OK) | |
585 | { | |
586 | if (debug_threads) | |
587 | fprintf (stderr, "td_ta_new(): %s\n", thread_db_err_str (err)); | |
588 | return 0; | |
589 | } | |
590 | ||
591 | CHK (1, tdb.td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr")); | |
592 | CHK (1, tdb.td_thr_get_info_p = dlsym (handle, "td_thr_get_info")); | |
593 | CHK (1, tdb.td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter")); | |
594 | CHK (1, tdb.td_symbol_list_p = dlsym (handle, "td_symbol_list")); | |
595 | ||
596 | /* This is required only when thread_db_use_events is on. */ | |
597 | CHK (thread_db_use_events, | |
598 | tdb.td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable")); | |
599 | ||
600 | /* These are not essential. */ | |
601 | CHK (0, tdb.td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr")); | |
602 | CHK (0, tdb.td_ta_set_event_p = dlsym (handle, "td_ta_set_event")); | |
603 | CHK (0, tdb.td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg")); | |
604 | CHK (0, tdb.td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr")); | |
605 | ||
606 | #undef CHK | |
607 | ||
608 | proc->private->thread_db = xmalloc (sizeof (tdb)); | |
609 | memcpy (proc->private->thread_db, &tdb, sizeof (tdb)); | |
610 | ||
611 | return 1; | |
612 | } | |
613 | ||
10e86dd7 DE |
614 | #ifdef HAVE_DLADDR |
615 | ||
cdbfd419 PP |
616 | /* Lookup a library in which given symbol resides. |
617 | Note: this is looking in the GDBSERVER process, not in the inferior. | |
618 | Returns library name, or NULL. */ | |
619 | ||
620 | static const char * | |
621 | dladdr_to_soname (const void *addr) | |
622 | { | |
623 | Dl_info info; | |
624 | ||
625 | if (dladdr (addr, &info) != 0) | |
626 | return info.dli_fname; | |
627 | return NULL; | |
628 | } | |
629 | ||
10e86dd7 DE |
630 | #endif |
631 | ||
cdbfd419 PP |
632 | static int |
633 | try_thread_db_load (const char *library) | |
634 | { | |
635 | void *handle; | |
636 | ||
637 | if (debug_threads) | |
638 | fprintf (stderr, "Trying host libthread_db library: %s.\n", | |
639 | library); | |
640 | handle = dlopen (library, RTLD_NOW); | |
641 | if (handle == NULL) | |
642 | { | |
643 | if (debug_threads) | |
644 | fprintf (stderr, "dlopen failed: %s.\n", dlerror ()); | |
645 | return 0; | |
646 | } | |
647 | ||
10e86dd7 | 648 | #ifdef HAVE_DLADDR |
cdbfd419 PP |
649 | if (debug_threads && strchr (library, '/') == NULL) |
650 | { | |
651 | void *td_init; | |
652 | ||
653 | td_init = dlsym (handle, "td_init"); | |
654 | if (td_init != NULL) | |
655 | { | |
656 | const char *const libpath = dladdr_to_soname (td_init); | |
657 | ||
658 | if (libpath != NULL) | |
659 | fprintf (stderr, "Host %s resolved to: %s.\n", | |
660 | library, libpath); | |
661 | } | |
662 | } | |
10e86dd7 | 663 | #endif |
cdbfd419 PP |
664 | |
665 | if (try_thread_db_load_1 (handle)) | |
666 | return 1; | |
667 | ||
668 | /* This library "refused" to work on current inferior. */ | |
669 | dlclose (handle); | |
670 | return 0; | |
671 | } | |
672 | ||
673 | static int | |
674 | thread_db_load_search (void) | |
675 | { | |
676 | char path[PATH_MAX]; | |
677 | const char *search_path; | |
678 | int rc = 0; | |
679 | ||
680 | if (libthread_db_search_path == NULL) | |
681 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
682 | ||
683 | search_path = libthread_db_search_path; | |
684 | while (*search_path) | |
685 | { | |
686 | const char *end = strchr (search_path, ':'); | |
687 | if (end) | |
688 | { | |
689 | size_t len = end - search_path; | |
690 | if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
691 | { | |
692 | char *cp = xmalloc (len + 1); | |
693 | memcpy (cp, search_path, len); | |
694 | cp[len] = '\0'; | |
695 | warning ("libthread_db_search_path component too long, " | |
696 | "ignored: %s.", cp); | |
697 | free (cp); | |
698 | search_path += len + 1; | |
699 | continue; | |
700 | } | |
701 | memcpy (path, search_path, len); | |
702 | path[len] = '\0'; | |
703 | search_path += len + 1; | |
704 | } | |
705 | else | |
706 | { | |
707 | size_t len = strlen (search_path); | |
708 | ||
709 | if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
710 | { | |
711 | warning ("libthread_db_search_path component too long," | |
712 | " ignored: %s.", search_path); | |
713 | break; | |
714 | } | |
715 | memcpy (path, search_path, len + 1); | |
716 | search_path += len; | |
717 | } | |
718 | strcat (path, "/"); | |
719 | strcat (path, LIBTHREAD_DB_SO); | |
720 | if (debug_threads) | |
721 | fprintf (stderr, "thread_db_load_search trying %s\n", path); | |
722 | if (try_thread_db_load (path)) | |
723 | { | |
724 | rc = 1; | |
725 | break; | |
726 | } | |
727 | } | |
728 | if (rc == 0) | |
729 | rc = try_thread_db_load (LIBTHREAD_DB_SO); | |
730 | ||
731 | if (debug_threads) | |
732 | fprintf (stderr, "thread_db_load_search returning %d\n", rc); | |
733 | return rc; | |
dae5f5cf DJ |
734 | } |
735 | ||
96f15937 PP |
736 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
737 | ||
0d62e5e8 | 738 | int |
24a09b5f | 739 | thread_db_init (int use_events) |
0d62e5e8 | 740 | { |
95954743 | 741 | struct process_info *proc = current_process (); |
0d62e5e8 | 742 | |
fd500816 DJ |
743 | /* FIXME drow/2004-10-16: This is the "overall process ID", which |
744 | GNU/Linux calls tgid, "thread group ID". When we support | |
745 | attaching to threads, the original thread may not be the correct | |
746 | thread. We would have to get the process ID from /proc for NPTL. | |
747 | For LinuxThreads we could do something similar: follow the chain | |
748 | of parent processes until we find the highest one we're attached | |
749 | to, and use its tgid. | |
750 | ||
751 | This isn't the only place in gdbserver that assumes that the first | |
752 | process in the list is the thread group leader. */ | |
ea025f5f | 753 | |
24a09b5f DJ |
754 | thread_db_use_events = use_events; |
755 | ||
cdbfd419 | 756 | if (thread_db_load_search ()) |
0d62e5e8 | 757 | { |
24a09b5f | 758 | if (use_events && thread_db_enable_reporting () == 0) |
cdbfd419 PP |
759 | { |
760 | /* Keep trying; maybe event reporting will work later. */ | |
8336d594 | 761 | thread_db_mourn (proc); |
cdbfd419 PP |
762 | return 0; |
763 | } | |
0d62e5e8 | 764 | thread_db_find_new_threads (); |
fd500816 | 765 | thread_db_look_up_symbols (); |
95954743 | 766 | proc->all_symbols_looked_up = 1; |
0d62e5e8 | 767 | return 1; |
cdbfd419 | 768 | } |
0d62e5e8 | 769 | |
cdbfd419 PP |
770 | return 0; |
771 | } | |
772 | ||
ca5c370d PA |
773 | static int |
774 | any_thread_of (struct inferior_list_entry *entry, void *args) | |
775 | { | |
776 | int *pid_p = args; | |
777 | ||
778 | if (ptid_get_pid (entry->id) == *pid_p) | |
779 | return 1; | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
f9e39928 PA |
784 | static void |
785 | switch_to_process (struct process_info *proc) | |
786 | { | |
787 | int pid = pid_of (proc); | |
788 | ||
789 | current_inferior = | |
790 | (struct thread_info *) find_inferior (&all_threads, | |
791 | any_thread_of, &pid); | |
792 | } | |
793 | ||
cdbfd419 PP |
794 | /* Disconnect from libthread_db and free resources. */ |
795 | ||
8336d594 PA |
796 | static void |
797 | disable_thread_event_reporting (struct process_info *proc) | |
cdbfd419 PP |
798 | { |
799 | struct thread_db *thread_db = proc->private->thread_db; | |
800 | if (thread_db) | |
801 | { | |
21e1bee4 PP |
802 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
803 | td_thr_events_t *event); | |
804 | ||
fd7dd3e6 | 805 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
21e1bee4 | 806 | td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event"); |
fd7dd3e6 | 807 | #else |
fd7dd3e6 PA |
808 | td_ta_clear_event_p = &td_ta_clear_event; |
809 | #endif | |
810 | ||
8336d594 | 811 | if (td_ta_clear_event_p != NULL) |
21e1bee4 | 812 | { |
f9e39928 | 813 | struct thread_info *saved_inferior = current_inferior; |
21e1bee4 | 814 | td_thr_events_t events; |
8336d594 | 815 | |
f9e39928 | 816 | switch_to_process (proc); |
21e1bee4 | 817 | |
fd7dd3e6 PA |
818 | /* Set the process wide mask saying we aren't interested |
819 | in any events anymore. */ | |
21e1bee4 PP |
820 | td_event_fillset (&events); |
821 | (*td_ta_clear_event_p) (thread_db->thread_agent, &events); | |
8336d594 PA |
822 | |
823 | current_inferior = saved_inferior; | |
21e1bee4 | 824 | } |
8336d594 PA |
825 | } |
826 | } | |
827 | ||
f9e39928 PA |
828 | static void |
829 | remove_thread_event_breakpoints (struct process_info *proc) | |
830 | { | |
831 | struct thread_db *thread_db = proc->private->thread_db; | |
832 | ||
833 | if (thread_db->td_create_bp != NULL) | |
834 | { | |
835 | struct thread_info *saved_inferior = current_inferior; | |
836 | ||
837 | switch_to_process (proc); | |
838 | ||
839 | delete_breakpoint (thread_db->td_create_bp); | |
840 | thread_db->td_create_bp = NULL; | |
841 | ||
842 | current_inferior = saved_inferior; | |
843 | } | |
844 | } | |
845 | ||
8336d594 PA |
846 | void |
847 | thread_db_detach (struct process_info *proc) | |
848 | { | |
f9e39928 PA |
849 | struct thread_db *thread_db = proc->private->thread_db; |
850 | ||
851 | if (thread_db) | |
852 | { | |
853 | disable_thread_event_reporting (proc); | |
854 | remove_thread_event_breakpoints (proc); | |
855 | } | |
8336d594 PA |
856 | } |
857 | ||
858 | /* Disconnect from libthread_db and free resources. */ | |
859 | ||
860 | void | |
861 | thread_db_mourn (struct process_info *proc) | |
862 | { | |
863 | struct thread_db *thread_db = proc->private->thread_db; | |
864 | if (thread_db) | |
865 | { | |
866 | td_err_e (*td_ta_delete_p) (td_thragent_t *); | |
867 | ||
868 | #ifndef USE_LIBTHREAD_DB_DIRECTLY | |
869 | td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete"); | |
870 | #else | |
871 | td_ta_delete_p = &td_ta_delete; | |
872 | #endif | |
cdbfd419 | 873 | |
cdbfd419 PP |
874 | if (td_ta_delete_p != NULL) |
875 | (*td_ta_delete_p) (thread_db->thread_agent); | |
876 | ||
fd7dd3e6 | 877 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 878 | dlclose (thread_db->handle); |
96f15937 PP |
879 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
880 | ||
cdbfd419 PP |
881 | free (thread_db); |
882 | proc->private->thread_db = NULL; | |
883 | } | |
884 | } | |
885 | ||
886 | /* Handle "set libthread-db-search-path" monitor command and return 1. | |
887 | For any other command, return 0. */ | |
888 | ||
889 | int | |
890 | thread_db_handle_monitor_command (char *mon) | |
891 | { | |
892 | if (strncmp (mon, "set libthread-db-search-path ", 29) == 0) | |
893 | { | |
894 | const char *cp = mon + 29; | |
895 | ||
896 | if (libthread_db_search_path != NULL) | |
897 | free (libthread_db_search_path); | |
898 | ||
899 | /* Skip leading space (if any). */ | |
900 | while (isspace (*cp)) | |
901 | ++cp; | |
902 | ||
903 | libthread_db_search_path = xstrdup (cp); | |
904 | ||
905 | monitor_output ("libthread-db-search-path set to `"); | |
906 | monitor_output (libthread_db_search_path); | |
907 | monitor_output ("'\n"); | |
908 | return 1; | |
0d62e5e8 DJ |
909 | } |
910 | ||
cdbfd419 | 911 | /* Tell server.c to perform default processing. */ |
0d62e5e8 DJ |
912 | return 0; |
913 | } |