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 | ||
9836d6ea PA |
50 | /* If this flag has been set, we've already asked GDB for all |
51 | symbols we might need; assume symbol cache misses are | |
52 | failures. */ | |
53 | int all_symbols_looked_up; | |
54 | ||
96f15937 | 55 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 PP |
56 | /* Handle of the libthread_db from dlopen. */ |
57 | void *handle; | |
96f15937 | 58 | #endif |
cdbfd419 | 59 | |
f9e39928 PA |
60 | /* Thread creation event breakpoint. The code at this location in |
61 | the child process will be called by the pthread library whenever | |
62 | a new thread is created. By setting a special breakpoint at this | |
63 | location, GDB can detect when a new thread is created. We obtain | |
64 | this location via the td_ta_event_addr call. Note that if the | |
65 | running kernel supports tracing clones, then we don't need to use | |
66 | (and in fact don't use) this magic thread event breakpoint to | |
67 | learn about threads. */ | |
68 | struct breakpoint *td_create_bp; | |
69 | ||
cdbfd419 PP |
70 | /* Addresses of libthread_db functions. */ |
71 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, td_thragent_t **ta); | |
72 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
73 | td_event_msg_t *msg); | |
74 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
75 | td_thr_events_t *event); | |
76 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
77 | td_event_e event, td_notify_t *ptr); | |
78 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, | |
79 | td_thrhandle_t *th); | |
80 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
81 | td_thrinfo_t *infop); | |
82 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); | |
83 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
84 | td_thr_iter_f *callback, void *cbdata_p, | |
85 | td_thr_state_e state, int ti_pri, | |
86 | sigset_t *ti_sigmask_p, | |
87 | unsigned int ti_user_flags); | |
88 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
89 | psaddr_t map_address, |
90 | size_t offset, psaddr_t *address); | |
cdbfd419 PP |
91 | const char ** (*td_symbol_list_p) (void); |
92 | }; | |
93 | ||
94 | static char *libthread_db_search_path; | |
186947f7 | 95 | |
95954743 | 96 | static int find_one_thread (ptid_t); |
0d62e5e8 DJ |
97 | static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
98 | ||
54363045 | 99 | static const char * |
0d62e5e8 DJ |
100 | thread_db_err_str (td_err_e err) |
101 | { | |
102 | static char buf[64]; | |
103 | ||
104 | switch (err) | |
105 | { | |
106 | case TD_OK: | |
107 | return "generic 'call succeeded'"; | |
108 | case TD_ERR: | |
109 | return "generic error"; | |
110 | case TD_NOTHR: | |
111 | return "no thread to satisfy query"; | |
112 | case TD_NOSV: | |
113 | return "no sync handle to satisfy query"; | |
114 | case TD_NOLWP: | |
115 | return "no LWP to satisfy query"; | |
116 | case TD_BADPH: | |
117 | return "invalid process handle"; | |
118 | case TD_BADTH: | |
119 | return "invalid thread handle"; | |
120 | case TD_BADSH: | |
121 | return "invalid synchronization handle"; | |
122 | case TD_BADTA: | |
123 | return "invalid thread agent"; | |
124 | case TD_BADKEY: | |
125 | return "invalid key"; | |
126 | case TD_NOMSG: | |
127 | return "no event message for getmsg"; | |
128 | case TD_NOFPREGS: | |
129 | return "FPU register set not available"; | |
130 | case TD_NOLIBTHREAD: | |
131 | return "application not linked with libthread"; | |
132 | case TD_NOEVENT: | |
133 | return "requested event is not supported"; | |
134 | case TD_NOCAPAB: | |
135 | return "capability not available"; | |
136 | case TD_DBERR: | |
137 | return "debugger service failed"; | |
138 | case TD_NOAPLIC: | |
139 | return "operation not applicable to"; | |
140 | case TD_NOTSD: | |
141 | return "no thread-specific data for this thread"; | |
142 | case TD_MALLOC: | |
143 | return "malloc failed"; | |
144 | case TD_PARTIALREG: | |
145 | return "only part of register set was written/read"; | |
146 | case TD_NOXREGS: | |
147 | return "X register set not available for this thread"; | |
3db0444b DJ |
148 | #ifdef HAVE_TD_VERSION |
149 | case TD_VERSION: | |
150 | return "version mismatch between libthread_db and libpthread"; | |
151 | #endif | |
0d62e5e8 | 152 | default: |
6cebaf6e | 153 | xsnprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); |
0d62e5e8 DJ |
154 | return buf; |
155 | } | |
156 | } | |
157 | ||
158 | #if 0 | |
159 | static char * | |
160 | thread_db_state_str (td_thr_state_e state) | |
161 | { | |
162 | static char buf[64]; | |
163 | ||
164 | switch (state) | |
165 | { | |
166 | case TD_THR_STOPPED: | |
167 | return "stopped by debugger"; | |
168 | case TD_THR_RUN: | |
169 | return "runnable"; | |
170 | case TD_THR_ACTIVE: | |
171 | return "active"; | |
172 | case TD_THR_ZOMBIE: | |
173 | return "zombie"; | |
174 | case TD_THR_SLEEP: | |
175 | return "sleeping"; | |
176 | case TD_THR_STOPPED_ASLEEP: | |
177 | return "stopped by debugger AND blocked"; | |
178 | default: | |
6cebaf6e | 179 | xsnprintf (buf, sizeof (buf), "unknown thread_db state %d", state); |
0d62e5e8 DJ |
180 | return buf; |
181 | } | |
182 | } | |
183 | #endif | |
184 | ||
b65d95c5 | 185 | static int |
0d62e5e8 DJ |
186 | thread_db_create_event (CORE_ADDR where) |
187 | { | |
188 | td_event_msg_t msg; | |
189 | td_err_e err; | |
54a0b537 | 190 | struct lwp_info *lwp; |
cdbfd419 PP |
191 | struct thread_db *thread_db = current_process ()->private->thread_db; |
192 | ||
193 | if (thread_db->td_ta_event_getmsg_p == NULL) | |
194 | fatal ("unexpected thread_db->td_ta_event_getmsg_p == NULL"); | |
0d62e5e8 DJ |
195 | |
196 | if (debug_threads) | |
197 | fprintf (stderr, "Thread creation event.\n"); | |
198 | ||
0d62e5e8 DJ |
199 | /* FIXME: This assumes we don't get another event. |
200 | In the LinuxThreads implementation, this is safe, | |
201 | because all events come from the manager thread | |
202 | (except for its own creation, of course). */ | |
cdbfd419 | 203 | err = thread_db->td_ta_event_getmsg_p (thread_db->thread_agent, &msg); |
0d62e5e8 DJ |
204 | if (err != TD_OK) |
205 | fprintf (stderr, "thread getmsg err: %s\n", | |
206 | thread_db_err_str (err)); | |
207 | ||
4105de34 DJ |
208 | /* If we do not know about the main thread yet, this would be a good time to |
209 | find it. We need to do this to pick up the main thread before any newly | |
210 | created threads. */ | |
54a0b537 PA |
211 | lwp = get_thread_lwp (current_inferior); |
212 | if (lwp->thread_known == 0) | |
95954743 | 213 | find_one_thread (lwp->head.id); |
4105de34 | 214 | |
0d62e5e8 DJ |
215 | /* msg.event == TD_EVENT_CREATE */ |
216 | ||
217 | find_new_threads_callback (msg.th_p, NULL); | |
b65d95c5 DJ |
218 | |
219 | return 0; | |
0d62e5e8 DJ |
220 | } |
221 | ||
0d62e5e8 | 222 | static int |
f9e39928 | 223 | thread_db_enable_reporting (void) |
0d62e5e8 DJ |
224 | { |
225 | td_thr_events_t events; | |
226 | td_notify_t notify; | |
227 | td_err_e err; | |
cdbfd419 PP |
228 | struct thread_db *thread_db = current_process ()->private->thread_db; |
229 | ||
230 | if (thread_db->td_ta_set_event_p == NULL | |
231 | || thread_db->td_ta_event_addr_p == NULL | |
232 | || thread_db->td_ta_event_getmsg_p == NULL) | |
233 | /* This libthread_db is missing required support. */ | |
234 | return 0; | |
0d62e5e8 DJ |
235 | |
236 | /* Set the process wide mask saying which events we're interested in. */ | |
237 | td_event_emptyset (&events); | |
238 | td_event_addset (&events, TD_CREATE); | |
239 | ||
cdbfd419 | 240 | err = thread_db->td_ta_set_event_p (thread_db->thread_agent, &events); |
0d62e5e8 DJ |
241 | if (err != TD_OK) |
242 | { | |
243 | warning ("Unable to set global thread event mask: %s", | |
1b3f6016 | 244 | thread_db_err_str (err)); |
0d62e5e8 DJ |
245 | return 0; |
246 | } | |
247 | ||
248 | /* Get address for thread creation breakpoint. */ | |
cdbfd419 PP |
249 | err = thread_db->td_ta_event_addr_p (thread_db->thread_agent, TD_CREATE, |
250 | ¬ify); | |
0d62e5e8 DJ |
251 | if (err != TD_OK) |
252 | { | |
253 | warning ("Unable to get location for thread creation breakpoint: %s", | |
254 | thread_db_err_str (err)); | |
255 | return 0; | |
256 | } | |
f9e39928 PA |
257 | thread_db->td_create_bp |
258 | = set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, | |
259 | thread_db_create_event); | |
0d62e5e8 | 260 | |
0d62e5e8 DJ |
261 | return 1; |
262 | } | |
263 | ||
ae13219e | 264 | static int |
95954743 | 265 | find_one_thread (ptid_t ptid) |
0d62e5e8 | 266 | { |
ae13219e DJ |
267 | td_thrhandle_t th; |
268 | td_thrinfo_t ti; | |
0d62e5e8 DJ |
269 | td_err_e err; |
270 | struct thread_info *inferior; | |
54a0b537 | 271 | struct lwp_info *lwp; |
cdbfd419 | 272 | struct thread_db *thread_db = current_process ()->private->thread_db; |
95954743 | 273 | int lwpid = ptid_get_lwp (ptid); |
0d62e5e8 | 274 | |
95954743 | 275 | inferior = (struct thread_info *) find_inferior_id (&all_threads, ptid); |
54a0b537 PA |
276 | lwp = get_thread_lwp (inferior); |
277 | if (lwp->thread_known) | |
ae13219e DJ |
278 | return 1; |
279 | ||
24a09b5f | 280 | /* Get information about this thread. */ |
cdbfd419 | 281 | err = thread_db->td_ta_map_lwp2thr_p (thread_db->thread_agent, lwpid, &th); |
ae13219e | 282 | if (err != TD_OK) |
24a09b5f DJ |
283 | error ("Cannot get thread handle for LWP %d: %s", |
284 | lwpid, thread_db_err_str (err)); | |
ae13219e | 285 | |
cdbfd419 | 286 | err = thread_db->td_thr_get_info_p (&th, &ti); |
ae13219e | 287 | if (err != TD_OK) |
24a09b5f DJ |
288 | error ("Cannot get thread info for LWP %d: %s", |
289 | lwpid, thread_db_err_str (err)); | |
ae13219e DJ |
290 | |
291 | if (debug_threads) | |
24a09b5f | 292 | fprintf (stderr, "Found thread %ld (LWP %d)\n", |
ae13219e DJ |
293 | ti.ti_tid, ti.ti_lid); |
294 | ||
95954743 | 295 | if (lwpid != ti.ti_lid) |
24a09b5f DJ |
296 | { |
297 | warning ("PID mismatch! Expected %ld, got %ld", | |
95954743 | 298 | (long) lwpid, (long) ti.ti_lid); |
24a09b5f DJ |
299 | return 0; |
300 | } | |
ae13219e | 301 | |
24a09b5f | 302 | if (thread_db_use_events) |
0d62e5e8 | 303 | { |
cdbfd419 | 304 | err = thread_db->td_thr_event_enable_p (&th, 1); |
ae13219e DJ |
305 | if (err != TD_OK) |
306 | error ("Cannot enable thread event reporting for %d: %s", | |
307 | ti.ti_lid, thread_db_err_str (err)); | |
0d62e5e8 | 308 | } |
ae13219e | 309 | |
24a09b5f DJ |
310 | /* If the new thread ID is zero, a final thread ID will be available |
311 | later. Do not enable thread debugging yet. */ | |
312 | if (ti.ti_tid == 0) | |
313 | return 0; | |
ae13219e | 314 | |
54a0b537 PA |
315 | lwp->thread_known = 1; |
316 | lwp->th = th; | |
ae13219e | 317 | |
ae13219e DJ |
318 | return 1; |
319 | } | |
320 | ||
5f7d1694 PP |
321 | /* Attach a thread. Return true on success. */ |
322 | ||
323 | static int | |
324 | attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p) | |
ae13219e | 325 | { |
54a0b537 | 326 | struct lwp_info *lwp; |
ae13219e | 327 | |
0d62e5e8 DJ |
328 | if (debug_threads) |
329 | fprintf (stderr, "Attaching to thread %ld (LWP %d)\n", | |
330 | ti_p->ti_tid, ti_p->ti_lid); | |
24a09b5f | 331 | linux_attach_lwp (ti_p->ti_lid); |
95954743 PA |
332 | lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); |
333 | if (lwp == NULL) | |
0d62e5e8 DJ |
334 | { |
335 | warning ("Could not attach to thread %ld (LWP %d)\n", | |
336 | ti_p->ti_tid, ti_p->ti_lid); | |
5f7d1694 | 337 | return 0; |
0d62e5e8 DJ |
338 | } |
339 | ||
54a0b537 PA |
340 | lwp->thread_known = 1; |
341 | lwp->th = *th_p; | |
24a09b5f DJ |
342 | |
343 | if (thread_db_use_events) | |
344 | { | |
5f7d1694 | 345 | td_err_e err; |
cdbfd419 | 346 | struct thread_db *thread_db = current_process ()->private->thread_db; |
5f7d1694 | 347 | |
cdbfd419 | 348 | err = thread_db->td_thr_event_enable_p (th_p, 1); |
24a09b5f DJ |
349 | if (err != TD_OK) |
350 | error ("Cannot enable thread event reporting for %d: %s", | |
351 | ti_p->ti_lid, thread_db_err_str (err)); | |
352 | } | |
5f7d1694 PP |
353 | |
354 | return 1; | |
355 | } | |
356 | ||
357 | /* Attach thread if we haven't seen it yet. | |
358 | Increment *COUNTER if we have attached a new thread. | |
359 | Return false on failure. */ | |
360 | ||
361 | static int | |
362 | maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p, | |
363 | int *counter) | |
364 | { | |
365 | struct lwp_info *lwp; | |
366 | ||
367 | lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); | |
368 | if (lwp != NULL) | |
369 | return 1; | |
370 | ||
371 | if (!attach_thread (th_p, ti_p)) | |
372 | return 0; | |
373 | ||
374 | if (counter != NULL) | |
375 | *counter += 1; | |
376 | ||
377 | return 1; | |
0d62e5e8 DJ |
378 | } |
379 | ||
380 | static int | |
381 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
382 | { | |
383 | td_thrinfo_t ti; | |
384 | td_err_e err; | |
cdbfd419 | 385 | struct thread_db *thread_db = current_process ()->private->thread_db; |
0d62e5e8 | 386 | |
cdbfd419 | 387 | err = thread_db->td_thr_get_info_p (th_p, &ti); |
0d62e5e8 DJ |
388 | if (err != TD_OK) |
389 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
390 | ||
391 | /* Check for zombies. */ | |
392 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) | |
393 | return 0; | |
394 | ||
5f7d1694 PP |
395 | if (!maybe_attach_thread (th_p, &ti, (int *) data)) |
396 | { | |
397 | /* Terminate iteration early: we might be looking at stale data in | |
398 | the inferior. The thread_db_find_new_threads will retry. */ | |
399 | return 1; | |
400 | } | |
0d62e5e8 DJ |
401 | |
402 | return 0; | |
403 | } | |
404 | ||
405 | static void | |
406 | thread_db_find_new_threads (void) | |
407 | { | |
408 | td_err_e err; | |
95954743 | 409 | ptid_t ptid = ((struct inferior_list_entry *) current_inferior)->id; |
cdbfd419 | 410 | struct thread_db *thread_db = current_process ()->private->thread_db; |
5f7d1694 | 411 | int loop, iteration; |
0d62e5e8 | 412 | |
ae13219e DJ |
413 | /* This function is only called when we first initialize thread_db. |
414 | First locate the initial thread. If it is not ready for | |
415 | debugging yet, then stop. */ | |
95954743 | 416 | if (find_one_thread (ptid) == 0) |
ae13219e DJ |
417 | return; |
418 | ||
5f7d1694 PP |
419 | /* Require 4 successive iterations which do not find any new threads. |
420 | The 4 is a heuristic: there is an inherent race here, and I have | |
421 | seen that 2 iterations in a row are not always sufficient to | |
422 | "capture" all threads. */ | |
423 | for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration) | |
424 | { | |
425 | int new_thread_count = 0; | |
426 | ||
427 | /* Iterate over all user-space threads to discover new threads. */ | |
428 | err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent, | |
429 | find_new_threads_callback, | |
430 | &new_thread_count, | |
431 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
432 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
433 | if (debug_threads) | |
434 | fprintf (stderr, "Found %d threads in iteration %d.\n", | |
435 | new_thread_count, iteration); | |
436 | ||
437 | if (new_thread_count != 0) | |
438 | { | |
439 | /* Found new threads. Restart iteration from beginning. */ | |
440 | loop = -1; | |
441 | } | |
442 | } | |
0d62e5e8 DJ |
443 | if (err != TD_OK) |
444 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
445 | } | |
446 | ||
fd500816 DJ |
447 | /* Cache all future symbols that thread_db might request. We can not |
448 | request symbols at arbitrary states in the remote protocol, only | |
449 | when the client tells us that new symbols are available. So when | |
450 | we load the thread library, make sure to check the entire list. */ | |
451 | ||
452 | static void | |
453 | thread_db_look_up_symbols (void) | |
454 | { | |
cdbfd419 PP |
455 | struct thread_db *thread_db = current_process ()->private->thread_db; |
456 | const char **sym_list; | |
fd500816 DJ |
457 | CORE_ADDR unused; |
458 | ||
cdbfd419 | 459 | for (sym_list = thread_db->td_symbol_list_p (); *sym_list; sym_list++) |
9836d6ea PA |
460 | look_up_one_symbol (*sym_list, &unused, 1); |
461 | ||
462 | /* We're not interested in any other libraries loaded after this | |
463 | point, only in symbols in libpthread.so. */ | |
464 | thread_db->all_symbols_looked_up = 1; | |
465 | } | |
466 | ||
467 | int | |
468 | thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp) | |
469 | { | |
470 | struct thread_db *thread_db = current_process ()->private->thread_db; | |
471 | int may_ask_gdb = !thread_db->all_symbols_looked_up; | |
472 | ||
473 | /* If we've passed the call to thread_db_look_up_symbols, then | |
474 | anything not in the cache must not exist; we're not interested | |
475 | in any libraries loaded after that point, only in symbols in | |
476 | libpthread.so. It might not be an appropriate time to look | |
477 | up a symbol, e.g. while we're trying to fetch registers. */ | |
478 | return look_up_one_symbol (name, addrp, may_ask_gdb); | |
fd500816 DJ |
479 | } |
480 | ||
dae5f5cf DJ |
481 | int |
482 | thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, | |
483 | CORE_ADDR load_module, CORE_ADDR *address) | |
484 | { | |
dae5f5cf DJ |
485 | psaddr_t addr; |
486 | td_err_e err; | |
54a0b537 | 487 | struct lwp_info *lwp; |
95954743 | 488 | struct thread_info *saved_inferior; |
cdbfd419 PP |
489 | struct process_info *proc; |
490 | struct thread_db *thread_db; | |
491 | ||
492 | proc = get_thread_process (thread); | |
493 | thread_db = proc->private->thread_db; | |
dae5f5cf | 494 | |
7fe519cb | 495 | /* If the thread layer is not (yet) initialized, fail. */ |
9836d6ea | 496 | if (!thread_db->all_symbols_looked_up) |
7fe519cb UW |
497 | return TD_ERR; |
498 | ||
cdbfd419 PP |
499 | if (thread_db->td_thr_tls_get_addr_p == NULL) |
500 | return -1; | |
501 | ||
54a0b537 PA |
502 | lwp = get_thread_lwp (thread); |
503 | if (!lwp->thread_known) | |
95954743 | 504 | find_one_thread (lwp->head.id); |
54a0b537 | 505 | if (!lwp->thread_known) |
dae5f5cf DJ |
506 | return TD_NOTHR; |
507 | ||
95954743 PA |
508 | saved_inferior = current_inferior; |
509 | current_inferior = thread; | |
186947f7 DJ |
510 | /* Note the cast through uintptr_t: this interface only works if |
511 | a target address fits in a psaddr_t, which is a host pointer. | |
512 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
cdbfd419 PP |
513 | err = thread_db->td_thr_tls_get_addr_p (&lwp->th, |
514 | (psaddr_t) (uintptr_t) load_module, | |
515 | offset, &addr); | |
95954743 | 516 | current_inferior = saved_inferior; |
dae5f5cf DJ |
517 | if (err == TD_OK) |
518 | { | |
186947f7 | 519 | *address = (CORE_ADDR) (uintptr_t) addr; |
dae5f5cf DJ |
520 | return 0; |
521 | } | |
522 | else | |
523 | return err; | |
cdbfd419 PP |
524 | } |
525 | ||
96f15937 PP |
526 | #ifdef USE_LIBTHREAD_DB_DIRECTLY |
527 | ||
528 | static int | |
529 | thread_db_load_search (void) | |
530 | { | |
531 | td_err_e err; | |
9836d6ea | 532 | struct thread_db *tdb; |
96f15937 PP |
533 | struct process_info *proc = current_process (); |
534 | ||
535 | if (proc->private->thread_db != NULL) | |
536 | fatal ("unexpected: proc->private->thread_db != NULL"); | |
537 | ||
9836d6ea PA |
538 | tdb = xcalloc (1, sizeof (*tdb)); |
539 | proc->private->thread_db = tdb; | |
f9e39928 | 540 | |
9836d6ea | 541 | tdb->td_ta_new_p = &td_ta_new; |
96f15937 PP |
542 | |
543 | /* Attempt to open a connection to the thread library. */ | |
9836d6ea | 544 | err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
96f15937 PP |
545 | if (err != TD_OK) |
546 | { | |
547 | if (debug_threads) | |
548 | fprintf (stderr, "td_ta_new(): %s\n", thread_db_err_str (err)); | |
9836d6ea PA |
549 | free (tdb); |
550 | proc->private->thread_db = NULL; | |
96f15937 PP |
551 | return 0; |
552 | } | |
553 | ||
9836d6ea PA |
554 | tdb->td_ta_map_lwp2thr_p = &td_ta_map_lwp2thr; |
555 | tdb->td_thr_get_info_p = &td_thr_get_info; | |
556 | tdb->td_ta_thr_iter_p = &td_ta_thr_iter; | |
557 | tdb->td_symbol_list_p = &td_symbol_list; | |
96f15937 PP |
558 | |
559 | /* This is required only when thread_db_use_events is on. */ | |
9836d6ea | 560 | tdb->td_thr_event_enable_p = &td_thr_event_enable; |
96f15937 PP |
561 | |
562 | /* These are not essential. */ | |
9836d6ea PA |
563 | tdb->td_ta_event_addr_p = &td_ta_event_addr; |
564 | tdb->td_ta_set_event_p = &td_ta_set_event; | |
565 | tdb->td_ta_event_getmsg_p = &td_ta_event_getmsg; | |
566 | tdb->td_thr_tls_get_addr_p = &td_thr_tls_get_addr; | |
96f15937 PP |
567 | |
568 | return 1; | |
569 | } | |
570 | ||
571 | #else | |
572 | ||
cdbfd419 PP |
573 | static int |
574 | try_thread_db_load_1 (void *handle) | |
575 | { | |
576 | td_err_e err; | |
9836d6ea | 577 | struct thread_db *tdb; |
cdbfd419 PP |
578 | struct process_info *proc = current_process (); |
579 | ||
580 | if (proc->private->thread_db != NULL) | |
581 | fatal ("unexpected: proc->private->thread_db != NULL"); | |
582 | ||
9836d6ea PA |
583 | tdb = xcalloc (1, sizeof (*tdb)); |
584 | proc->private->thread_db = tdb; | |
f9e39928 | 585 | |
9836d6ea | 586 | tdb->handle = handle; |
cdbfd419 PP |
587 | |
588 | /* Initialize pointers to the dynamic library functions we will use. | |
589 | Essential functions first. */ | |
590 | ||
591 | #define CHK(required, a) \ | |
592 | do \ | |
593 | { \ | |
594 | if ((a) == NULL) \ | |
595 | { \ | |
596 | if (debug_threads) \ | |
597 | fprintf (stderr, "dlsym: %s\n", dlerror ()); \ | |
598 | if (required) \ | |
9836d6ea PA |
599 | { \ |
600 | free (tdb); \ | |
601 | proc->private->thread_db = NULL; \ | |
602 | return 0; \ | |
603 | } \ | |
cdbfd419 PP |
604 | } \ |
605 | } \ | |
606 | while (0) | |
607 | ||
9836d6ea | 608 | CHK (1, tdb->td_ta_new_p = dlsym (handle, "td_ta_new")); |
cdbfd419 PP |
609 | |
610 | /* Attempt to open a connection to the thread library. */ | |
9836d6ea | 611 | err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
cdbfd419 PP |
612 | if (err != TD_OK) |
613 | { | |
614 | if (debug_threads) | |
615 | fprintf (stderr, "td_ta_new(): %s\n", thread_db_err_str (err)); | |
9836d6ea PA |
616 | free (tdb); |
617 | proc->private->thread_db = NULL; | |
cdbfd419 PP |
618 | return 0; |
619 | } | |
620 | ||
9836d6ea PA |
621 | CHK (1, tdb->td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr")); |
622 | CHK (1, tdb->td_thr_get_info_p = dlsym (handle, "td_thr_get_info")); | |
623 | CHK (1, tdb->td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter")); | |
624 | CHK (1, tdb->td_symbol_list_p = dlsym (handle, "td_symbol_list")); | |
cdbfd419 PP |
625 | |
626 | /* This is required only when thread_db_use_events is on. */ | |
627 | CHK (thread_db_use_events, | |
9836d6ea | 628 | tdb->td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable")); |
cdbfd419 PP |
629 | |
630 | /* These are not essential. */ | |
9836d6ea PA |
631 | CHK (0, tdb->td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr")); |
632 | CHK (0, tdb->td_ta_set_event_p = dlsym (handle, "td_ta_set_event")); | |
633 | CHK (0, tdb->td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg")); | |
634 | CHK (0, tdb->td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr")); | |
cdbfd419 PP |
635 | |
636 | #undef CHK | |
637 | ||
cdbfd419 PP |
638 | return 1; |
639 | } | |
640 | ||
10e86dd7 DE |
641 | #ifdef HAVE_DLADDR |
642 | ||
cdbfd419 PP |
643 | /* Lookup a library in which given symbol resides. |
644 | Note: this is looking in the GDBSERVER process, not in the inferior. | |
645 | Returns library name, or NULL. */ | |
646 | ||
647 | static const char * | |
648 | dladdr_to_soname (const void *addr) | |
649 | { | |
650 | Dl_info info; | |
651 | ||
652 | if (dladdr (addr, &info) != 0) | |
653 | return info.dli_fname; | |
654 | return NULL; | |
655 | } | |
656 | ||
10e86dd7 DE |
657 | #endif |
658 | ||
cdbfd419 PP |
659 | static int |
660 | try_thread_db_load (const char *library) | |
661 | { | |
662 | void *handle; | |
663 | ||
664 | if (debug_threads) | |
665 | fprintf (stderr, "Trying host libthread_db library: %s.\n", | |
666 | library); | |
667 | handle = dlopen (library, RTLD_NOW); | |
668 | if (handle == NULL) | |
669 | { | |
670 | if (debug_threads) | |
671 | fprintf (stderr, "dlopen failed: %s.\n", dlerror ()); | |
672 | return 0; | |
673 | } | |
674 | ||
10e86dd7 | 675 | #ifdef HAVE_DLADDR |
cdbfd419 PP |
676 | if (debug_threads && strchr (library, '/') == NULL) |
677 | { | |
678 | void *td_init; | |
679 | ||
680 | td_init = dlsym (handle, "td_init"); | |
681 | if (td_init != NULL) | |
682 | { | |
683 | const char *const libpath = dladdr_to_soname (td_init); | |
684 | ||
685 | if (libpath != NULL) | |
686 | fprintf (stderr, "Host %s resolved to: %s.\n", | |
687 | library, libpath); | |
688 | } | |
689 | } | |
10e86dd7 | 690 | #endif |
cdbfd419 PP |
691 | |
692 | if (try_thread_db_load_1 (handle)) | |
693 | return 1; | |
694 | ||
695 | /* This library "refused" to work on current inferior. */ | |
696 | dlclose (handle); | |
697 | return 0; | |
698 | } | |
699 | ||
700 | static int | |
701 | thread_db_load_search (void) | |
702 | { | |
703 | char path[PATH_MAX]; | |
704 | const char *search_path; | |
705 | int rc = 0; | |
706 | ||
707 | if (libthread_db_search_path == NULL) | |
708 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
709 | ||
710 | search_path = libthread_db_search_path; | |
711 | while (*search_path) | |
712 | { | |
713 | const char *end = strchr (search_path, ':'); | |
714 | if (end) | |
715 | { | |
716 | size_t len = end - search_path; | |
717 | if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
718 | { | |
719 | char *cp = xmalloc (len + 1); | |
720 | memcpy (cp, search_path, len); | |
721 | cp[len] = '\0'; | |
722 | warning ("libthread_db_search_path component too long, " | |
723 | "ignored: %s.", cp); | |
724 | free (cp); | |
725 | search_path += len + 1; | |
726 | continue; | |
727 | } | |
728 | memcpy (path, search_path, len); | |
729 | path[len] = '\0'; | |
730 | search_path += len + 1; | |
731 | } | |
732 | else | |
733 | { | |
734 | size_t len = strlen (search_path); | |
735 | ||
736 | if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
737 | { | |
738 | warning ("libthread_db_search_path component too long," | |
739 | " ignored: %s.", search_path); | |
740 | break; | |
741 | } | |
742 | memcpy (path, search_path, len + 1); | |
743 | search_path += len; | |
744 | } | |
745 | strcat (path, "/"); | |
746 | strcat (path, LIBTHREAD_DB_SO); | |
747 | if (debug_threads) | |
748 | fprintf (stderr, "thread_db_load_search trying %s\n", path); | |
749 | if (try_thread_db_load (path)) | |
750 | { | |
751 | rc = 1; | |
752 | break; | |
753 | } | |
754 | } | |
755 | if (rc == 0) | |
756 | rc = try_thread_db_load (LIBTHREAD_DB_SO); | |
757 | ||
758 | if (debug_threads) | |
759 | fprintf (stderr, "thread_db_load_search returning %d\n", rc); | |
760 | return rc; | |
dae5f5cf DJ |
761 | } |
762 | ||
96f15937 PP |
763 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
764 | ||
0d62e5e8 | 765 | int |
24a09b5f | 766 | thread_db_init (int use_events) |
0d62e5e8 | 767 | { |
95954743 | 768 | struct process_info *proc = current_process (); |
0d62e5e8 | 769 | |
fd500816 DJ |
770 | /* FIXME drow/2004-10-16: This is the "overall process ID", which |
771 | GNU/Linux calls tgid, "thread group ID". When we support | |
772 | attaching to threads, the original thread may not be the correct | |
773 | thread. We would have to get the process ID from /proc for NPTL. | |
774 | For LinuxThreads we could do something similar: follow the chain | |
775 | of parent processes until we find the highest one we're attached | |
776 | to, and use its tgid. | |
777 | ||
778 | This isn't the only place in gdbserver that assumes that the first | |
779 | process in the list is the thread group leader. */ | |
ea025f5f | 780 | |
24a09b5f DJ |
781 | thread_db_use_events = use_events; |
782 | ||
cdbfd419 | 783 | if (thread_db_load_search ()) |
0d62e5e8 | 784 | { |
24a09b5f | 785 | if (use_events && thread_db_enable_reporting () == 0) |
cdbfd419 PP |
786 | { |
787 | /* Keep trying; maybe event reporting will work later. */ | |
8336d594 | 788 | thread_db_mourn (proc); |
cdbfd419 PP |
789 | return 0; |
790 | } | |
0d62e5e8 | 791 | thread_db_find_new_threads (); |
fd500816 | 792 | thread_db_look_up_symbols (); |
0d62e5e8 | 793 | return 1; |
cdbfd419 | 794 | } |
0d62e5e8 | 795 | |
cdbfd419 PP |
796 | return 0; |
797 | } | |
798 | ||
ca5c370d PA |
799 | static int |
800 | any_thread_of (struct inferior_list_entry *entry, void *args) | |
801 | { | |
802 | int *pid_p = args; | |
803 | ||
804 | if (ptid_get_pid (entry->id) == *pid_p) | |
805 | return 1; | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
f9e39928 PA |
810 | static void |
811 | switch_to_process (struct process_info *proc) | |
812 | { | |
813 | int pid = pid_of (proc); | |
814 | ||
815 | current_inferior = | |
816 | (struct thread_info *) find_inferior (&all_threads, | |
817 | any_thread_of, &pid); | |
818 | } | |
819 | ||
cdbfd419 PP |
820 | /* Disconnect from libthread_db and free resources. */ |
821 | ||
8336d594 PA |
822 | static void |
823 | disable_thread_event_reporting (struct process_info *proc) | |
cdbfd419 PP |
824 | { |
825 | struct thread_db *thread_db = proc->private->thread_db; | |
826 | if (thread_db) | |
827 | { | |
21e1bee4 PP |
828 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
829 | td_thr_events_t *event); | |
830 | ||
fd7dd3e6 | 831 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
21e1bee4 | 832 | td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event"); |
fd7dd3e6 | 833 | #else |
fd7dd3e6 PA |
834 | td_ta_clear_event_p = &td_ta_clear_event; |
835 | #endif | |
836 | ||
8336d594 | 837 | if (td_ta_clear_event_p != NULL) |
21e1bee4 | 838 | { |
f9e39928 | 839 | struct thread_info *saved_inferior = current_inferior; |
21e1bee4 | 840 | td_thr_events_t events; |
8336d594 | 841 | |
f9e39928 | 842 | switch_to_process (proc); |
21e1bee4 | 843 | |
fd7dd3e6 PA |
844 | /* Set the process wide mask saying we aren't interested |
845 | in any events anymore. */ | |
21e1bee4 PP |
846 | td_event_fillset (&events); |
847 | (*td_ta_clear_event_p) (thread_db->thread_agent, &events); | |
8336d594 PA |
848 | |
849 | current_inferior = saved_inferior; | |
21e1bee4 | 850 | } |
8336d594 PA |
851 | } |
852 | } | |
853 | ||
f9e39928 PA |
854 | static void |
855 | remove_thread_event_breakpoints (struct process_info *proc) | |
856 | { | |
857 | struct thread_db *thread_db = proc->private->thread_db; | |
858 | ||
859 | if (thread_db->td_create_bp != NULL) | |
860 | { | |
861 | struct thread_info *saved_inferior = current_inferior; | |
862 | ||
863 | switch_to_process (proc); | |
864 | ||
865 | delete_breakpoint (thread_db->td_create_bp); | |
866 | thread_db->td_create_bp = NULL; | |
867 | ||
868 | current_inferior = saved_inferior; | |
869 | } | |
870 | } | |
871 | ||
8336d594 PA |
872 | void |
873 | thread_db_detach (struct process_info *proc) | |
874 | { | |
f9e39928 PA |
875 | struct thread_db *thread_db = proc->private->thread_db; |
876 | ||
877 | if (thread_db) | |
878 | { | |
879 | disable_thread_event_reporting (proc); | |
880 | remove_thread_event_breakpoints (proc); | |
881 | } | |
8336d594 PA |
882 | } |
883 | ||
884 | /* Disconnect from libthread_db and free resources. */ | |
885 | ||
886 | void | |
887 | thread_db_mourn (struct process_info *proc) | |
888 | { | |
889 | struct thread_db *thread_db = proc->private->thread_db; | |
890 | if (thread_db) | |
891 | { | |
892 | td_err_e (*td_ta_delete_p) (td_thragent_t *); | |
893 | ||
894 | #ifndef USE_LIBTHREAD_DB_DIRECTLY | |
895 | td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete"); | |
896 | #else | |
897 | td_ta_delete_p = &td_ta_delete; | |
898 | #endif | |
cdbfd419 | 899 | |
cdbfd419 PP |
900 | if (td_ta_delete_p != NULL) |
901 | (*td_ta_delete_p) (thread_db->thread_agent); | |
902 | ||
fd7dd3e6 | 903 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 904 | dlclose (thread_db->handle); |
96f15937 PP |
905 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
906 | ||
cdbfd419 PP |
907 | free (thread_db); |
908 | proc->private->thread_db = NULL; | |
909 | } | |
910 | } | |
911 | ||
912 | /* Handle "set libthread-db-search-path" monitor command and return 1. | |
913 | For any other command, return 0. */ | |
914 | ||
915 | int | |
916 | thread_db_handle_monitor_command (char *mon) | |
917 | { | |
918 | if (strncmp (mon, "set libthread-db-search-path ", 29) == 0) | |
919 | { | |
920 | const char *cp = mon + 29; | |
921 | ||
922 | if (libthread_db_search_path != NULL) | |
923 | free (libthread_db_search_path); | |
924 | ||
925 | /* Skip leading space (if any). */ | |
926 | while (isspace (*cp)) | |
927 | ++cp; | |
928 | ||
929 | libthread_db_search_path = xstrdup (cp); | |
930 | ||
931 | monitor_output ("libthread-db-search-path set to `"); | |
932 | monitor_output (libthread_db_search_path); | |
933 | monitor_output ("'\n"); | |
934 | return 1; | |
0d62e5e8 DJ |
935 | } |
936 | ||
cdbfd419 | 937 | /* Tell server.c to perform default processing. */ |
0d62e5e8 DJ |
938 | return 0; |
939 | } |