Commit | Line | Data |
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0d62e5e8 | 1 | /* Thread management interface, for the remote server for GDB. |
0b302171 | 2 | Copyright (C) 2002, 2004-2012 Free Software Foundation, Inc. |
0d62e5e8 DJ |
3 | |
4 | Contributed by MontaVista Software. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
0d62e5e8 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0d62e5e8 DJ |
20 | |
21 | #include "server.h" | |
22 | ||
23 | #include "linux-low.h" | |
24 | ||
25 | extern int debug_threads; | |
26 | ||
24a09b5f DJ |
27 | static int thread_db_use_events; |
28 | ||
0050a760 | 29 | #include "gdb_proc_service.h" |
6938fd34 | 30 | #include "gdb_thread_db.h" |
0d62e5e8 | 31 | |
96f15937 | 32 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 33 | #include <dlfcn.h> |
96f15937 PP |
34 | #endif |
35 | ||
186947f7 | 36 | #include <stdint.h> |
cdbfd419 PP |
37 | #include <limits.h> |
38 | #include <ctype.h> | |
39 | ||
40 | struct thread_db | |
41 | { | |
42 | /* Structure that identifies the child process for the | |
43 | <proc_service.h> interface. */ | |
44 | struct ps_prochandle proc_handle; | |
45 | ||
46 | /* Connection to the libthread_db library. */ | |
47 | td_thragent_t *thread_agent; | |
48 | ||
9836d6ea PA |
49 | /* If this flag has been set, we've already asked GDB for all |
50 | symbols we might need; assume symbol cache misses are | |
51 | failures. */ | |
52 | int all_symbols_looked_up; | |
53 | ||
96f15937 | 54 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 PP |
55 | /* Handle of the libthread_db from dlopen. */ |
56 | void *handle; | |
96f15937 | 57 | #endif |
cdbfd419 | 58 | |
f9e39928 PA |
59 | /* Thread creation event breakpoint. The code at this location in |
60 | the child process will be called by the pthread library whenever | |
61 | a new thread is created. By setting a special breakpoint at this | |
62 | location, GDB can detect when a new thread is created. We obtain | |
63 | this location via the td_ta_event_addr call. Note that if the | |
64 | running kernel supports tracing clones, then we don't need to use | |
65 | (and in fact don't use) this magic thread event breakpoint to | |
66 | learn about threads. */ | |
67 | struct breakpoint *td_create_bp; | |
68 | ||
cdbfd419 PP |
69 | /* Addresses of libthread_db functions. */ |
70 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, td_thragent_t **ta); | |
71 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
72 | td_event_msg_t *msg); | |
73 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
74 | td_thr_events_t *event); | |
75 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
76 | td_event_e event, td_notify_t *ptr); | |
77 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, | |
78 | td_thrhandle_t *th); | |
79 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
80 | td_thrinfo_t *infop); | |
81 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); | |
82 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
83 | td_thr_iter_f *callback, void *cbdata_p, | |
84 | td_thr_state_e state, int ti_pri, | |
85 | sigset_t *ti_sigmask_p, | |
86 | unsigned int ti_user_flags); | |
87 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
88 | psaddr_t map_address, |
89 | size_t offset, psaddr_t *address); | |
cdbfd419 PP |
90 | const char ** (*td_symbol_list_p) (void); |
91 | }; | |
92 | ||
93 | static char *libthread_db_search_path; | |
186947f7 | 94 | |
95954743 | 95 | static int find_one_thread (ptid_t); |
0d62e5e8 DJ |
96 | static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
97 | ||
54363045 | 98 | static const char * |
0d62e5e8 DJ |
99 | thread_db_err_str (td_err_e err) |
100 | { | |
101 | static char buf[64]; | |
102 | ||
103 | switch (err) | |
104 | { | |
105 | case TD_OK: | |
106 | return "generic 'call succeeded'"; | |
107 | case TD_ERR: | |
108 | return "generic error"; | |
109 | case TD_NOTHR: | |
110 | return "no thread to satisfy query"; | |
111 | case TD_NOSV: | |
112 | return "no sync handle to satisfy query"; | |
113 | case TD_NOLWP: | |
114 | return "no LWP to satisfy query"; | |
115 | case TD_BADPH: | |
116 | return "invalid process handle"; | |
117 | case TD_BADTH: | |
118 | return "invalid thread handle"; | |
119 | case TD_BADSH: | |
120 | return "invalid synchronization handle"; | |
121 | case TD_BADTA: | |
122 | return "invalid thread agent"; | |
123 | case TD_BADKEY: | |
124 | return "invalid key"; | |
125 | case TD_NOMSG: | |
126 | return "no event message for getmsg"; | |
127 | case TD_NOFPREGS: | |
128 | return "FPU register set not available"; | |
129 | case TD_NOLIBTHREAD: | |
130 | return "application not linked with libthread"; | |
131 | case TD_NOEVENT: | |
132 | return "requested event is not supported"; | |
133 | case TD_NOCAPAB: | |
134 | return "capability not available"; | |
135 | case TD_DBERR: | |
136 | return "debugger service failed"; | |
137 | case TD_NOAPLIC: | |
138 | return "operation not applicable to"; | |
139 | case TD_NOTSD: | |
140 | return "no thread-specific data for this thread"; | |
141 | case TD_MALLOC: | |
142 | return "malloc failed"; | |
143 | case TD_PARTIALREG: | |
144 | return "only part of register set was written/read"; | |
145 | case TD_NOXREGS: | |
146 | return "X register set not available for this thread"; | |
3db0444b DJ |
147 | #ifdef HAVE_TD_VERSION |
148 | case TD_VERSION: | |
149 | return "version mismatch between libthread_db and libpthread"; | |
150 | #endif | |
0d62e5e8 | 151 | default: |
6cebaf6e | 152 | xsnprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); |
0d62e5e8 DJ |
153 | return buf; |
154 | } | |
155 | } | |
156 | ||
157 | #if 0 | |
158 | static char * | |
159 | thread_db_state_str (td_thr_state_e state) | |
160 | { | |
161 | static char buf[64]; | |
162 | ||
163 | switch (state) | |
164 | { | |
165 | case TD_THR_STOPPED: | |
166 | return "stopped by debugger"; | |
167 | case TD_THR_RUN: | |
168 | return "runnable"; | |
169 | case TD_THR_ACTIVE: | |
170 | return "active"; | |
171 | case TD_THR_ZOMBIE: | |
172 | return "zombie"; | |
173 | case TD_THR_SLEEP: | |
174 | return "sleeping"; | |
175 | case TD_THR_STOPPED_ASLEEP: | |
176 | return "stopped by debugger AND blocked"; | |
177 | default: | |
6cebaf6e | 178 | xsnprintf (buf, sizeof (buf), "unknown thread_db state %d", state); |
0d62e5e8 DJ |
179 | return buf; |
180 | } | |
181 | } | |
182 | #endif | |
183 | ||
b65d95c5 | 184 | static int |
0d62e5e8 DJ |
185 | thread_db_create_event (CORE_ADDR where) |
186 | { | |
187 | td_event_msg_t msg; | |
188 | td_err_e err; | |
54a0b537 | 189 | struct lwp_info *lwp; |
cdbfd419 PP |
190 | struct thread_db *thread_db = current_process ()->private->thread_db; |
191 | ||
192 | if (thread_db->td_ta_event_getmsg_p == NULL) | |
193 | fatal ("unexpected thread_db->td_ta_event_getmsg_p == NULL"); | |
0d62e5e8 DJ |
194 | |
195 | if (debug_threads) | |
196 | fprintf (stderr, "Thread creation event.\n"); | |
197 | ||
0d62e5e8 DJ |
198 | /* FIXME: This assumes we don't get another event. |
199 | In the LinuxThreads implementation, this is safe, | |
200 | because all events come from the manager thread | |
201 | (except for its own creation, of course). */ | |
cdbfd419 | 202 | err = thread_db->td_ta_event_getmsg_p (thread_db->thread_agent, &msg); |
0d62e5e8 DJ |
203 | if (err != TD_OK) |
204 | fprintf (stderr, "thread getmsg err: %s\n", | |
205 | thread_db_err_str (err)); | |
206 | ||
4105de34 DJ |
207 | /* If we do not know about the main thread yet, this would be a good time to |
208 | find it. We need to do this to pick up the main thread before any newly | |
209 | created threads. */ | |
54a0b537 PA |
210 | lwp = get_thread_lwp (current_inferior); |
211 | if (lwp->thread_known == 0) | |
95954743 | 212 | find_one_thread (lwp->head.id); |
4105de34 | 213 | |
0d62e5e8 DJ |
214 | /* msg.event == TD_EVENT_CREATE */ |
215 | ||
216 | find_new_threads_callback (msg.th_p, NULL); | |
b65d95c5 DJ |
217 | |
218 | return 0; | |
0d62e5e8 DJ |
219 | } |
220 | ||
0d62e5e8 | 221 | static int |
f9e39928 | 222 | thread_db_enable_reporting (void) |
0d62e5e8 DJ |
223 | { |
224 | td_thr_events_t events; | |
225 | td_notify_t notify; | |
226 | td_err_e err; | |
cdbfd419 PP |
227 | struct thread_db *thread_db = current_process ()->private->thread_db; |
228 | ||
229 | if (thread_db->td_ta_set_event_p == NULL | |
230 | || thread_db->td_ta_event_addr_p == NULL | |
231 | || thread_db->td_ta_event_getmsg_p == NULL) | |
232 | /* This libthread_db is missing required support. */ | |
233 | return 0; | |
0d62e5e8 DJ |
234 | |
235 | /* Set the process wide mask saying which events we're interested in. */ | |
236 | td_event_emptyset (&events); | |
237 | td_event_addset (&events, TD_CREATE); | |
238 | ||
cdbfd419 | 239 | err = thread_db->td_ta_set_event_p (thread_db->thread_agent, &events); |
0d62e5e8 DJ |
240 | if (err != TD_OK) |
241 | { | |
242 | warning ("Unable to set global thread event mask: %s", | |
1b3f6016 | 243 | thread_db_err_str (err)); |
0d62e5e8 DJ |
244 | return 0; |
245 | } | |
246 | ||
247 | /* Get address for thread creation breakpoint. */ | |
cdbfd419 PP |
248 | err = thread_db->td_ta_event_addr_p (thread_db->thread_agent, TD_CREATE, |
249 | ¬ify); | |
0d62e5e8 DJ |
250 | if (err != TD_OK) |
251 | { | |
252 | warning ("Unable to get location for thread creation breakpoint: %s", | |
253 | thread_db_err_str (err)); | |
254 | return 0; | |
255 | } | |
f9e39928 PA |
256 | thread_db->td_create_bp |
257 | = set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, | |
258 | thread_db_create_event); | |
0d62e5e8 | 259 | |
0d62e5e8 DJ |
260 | return 1; |
261 | } | |
262 | ||
ae13219e | 263 | static int |
95954743 | 264 | find_one_thread (ptid_t ptid) |
0d62e5e8 | 265 | { |
ae13219e DJ |
266 | td_thrhandle_t th; |
267 | td_thrinfo_t ti; | |
0d62e5e8 DJ |
268 | td_err_e err; |
269 | struct thread_info *inferior; | |
54a0b537 | 270 | struct lwp_info *lwp; |
cdbfd419 | 271 | struct thread_db *thread_db = current_process ()->private->thread_db; |
95954743 | 272 | int lwpid = ptid_get_lwp (ptid); |
0d62e5e8 | 273 | |
95954743 | 274 | inferior = (struct thread_info *) find_inferior_id (&all_threads, ptid); |
54a0b537 PA |
275 | lwp = get_thread_lwp (inferior); |
276 | if (lwp->thread_known) | |
ae13219e DJ |
277 | return 1; |
278 | ||
24a09b5f | 279 | /* Get information about this thread. */ |
cdbfd419 | 280 | err = thread_db->td_ta_map_lwp2thr_p (thread_db->thread_agent, lwpid, &th); |
ae13219e | 281 | if (err != TD_OK) |
24a09b5f DJ |
282 | error ("Cannot get thread handle for LWP %d: %s", |
283 | lwpid, thread_db_err_str (err)); | |
ae13219e | 284 | |
cdbfd419 | 285 | err = thread_db->td_thr_get_info_p (&th, &ti); |
ae13219e | 286 | if (err != TD_OK) |
24a09b5f DJ |
287 | error ("Cannot get thread info for LWP %d: %s", |
288 | lwpid, thread_db_err_str (err)); | |
ae13219e DJ |
289 | |
290 | if (debug_threads) | |
24a09b5f | 291 | fprintf (stderr, "Found thread %ld (LWP %d)\n", |
ae13219e DJ |
292 | ti.ti_tid, ti.ti_lid); |
293 | ||
95954743 | 294 | if (lwpid != ti.ti_lid) |
24a09b5f DJ |
295 | { |
296 | warning ("PID mismatch! Expected %ld, got %ld", | |
95954743 | 297 | (long) lwpid, (long) ti.ti_lid); |
24a09b5f DJ |
298 | return 0; |
299 | } | |
ae13219e | 300 | |
24a09b5f | 301 | if (thread_db_use_events) |
0d62e5e8 | 302 | { |
cdbfd419 | 303 | err = thread_db->td_thr_event_enable_p (&th, 1); |
ae13219e DJ |
304 | if (err != TD_OK) |
305 | error ("Cannot enable thread event reporting for %d: %s", | |
306 | ti.ti_lid, thread_db_err_str (err)); | |
0d62e5e8 | 307 | } |
ae13219e | 308 | |
24a09b5f DJ |
309 | /* If the new thread ID is zero, a final thread ID will be available |
310 | later. Do not enable thread debugging yet. */ | |
311 | if (ti.ti_tid == 0) | |
312 | return 0; | |
ae13219e | 313 | |
54a0b537 PA |
314 | lwp->thread_known = 1; |
315 | lwp->th = th; | |
ae13219e | 316 | |
ae13219e DJ |
317 | return 1; |
318 | } | |
319 | ||
5f7d1694 PP |
320 | /* Attach a thread. Return true on success. */ |
321 | ||
322 | static int | |
323 | attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p) | |
ae13219e | 324 | { |
54a0b537 | 325 | struct lwp_info *lwp; |
ae13219e | 326 | |
0d62e5e8 DJ |
327 | if (debug_threads) |
328 | fprintf (stderr, "Attaching to thread %ld (LWP %d)\n", | |
329 | ti_p->ti_tid, ti_p->ti_lid); | |
24a09b5f | 330 | linux_attach_lwp (ti_p->ti_lid); |
95954743 PA |
331 | lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); |
332 | if (lwp == NULL) | |
0d62e5e8 DJ |
333 | { |
334 | warning ("Could not attach to thread %ld (LWP %d)\n", | |
335 | ti_p->ti_tid, ti_p->ti_lid); | |
5f7d1694 | 336 | return 0; |
0d62e5e8 DJ |
337 | } |
338 | ||
54a0b537 PA |
339 | lwp->thread_known = 1; |
340 | lwp->th = *th_p; | |
24a09b5f DJ |
341 | |
342 | if (thread_db_use_events) | |
343 | { | |
5f7d1694 | 344 | td_err_e err; |
cdbfd419 | 345 | struct thread_db *thread_db = current_process ()->private->thread_db; |
5f7d1694 | 346 | |
cdbfd419 | 347 | err = thread_db->td_thr_event_enable_p (th_p, 1); |
24a09b5f DJ |
348 | if (err != TD_OK) |
349 | error ("Cannot enable thread event reporting for %d: %s", | |
350 | ti_p->ti_lid, thread_db_err_str (err)); | |
351 | } | |
5f7d1694 PP |
352 | |
353 | return 1; | |
354 | } | |
355 | ||
356 | /* Attach thread if we haven't seen it yet. | |
357 | Increment *COUNTER if we have attached a new thread. | |
358 | Return false on failure. */ | |
359 | ||
360 | static int | |
361 | maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p, | |
362 | int *counter) | |
363 | { | |
364 | struct lwp_info *lwp; | |
365 | ||
366 | lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); | |
367 | if (lwp != NULL) | |
368 | return 1; | |
369 | ||
370 | if (!attach_thread (th_p, ti_p)) | |
371 | return 0; | |
372 | ||
373 | if (counter != NULL) | |
374 | *counter += 1; | |
375 | ||
376 | return 1; | |
0d62e5e8 DJ |
377 | } |
378 | ||
379 | static int | |
380 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
381 | { | |
382 | td_thrinfo_t ti; | |
383 | td_err_e err; | |
cdbfd419 | 384 | struct thread_db *thread_db = current_process ()->private->thread_db; |
0d62e5e8 | 385 | |
cdbfd419 | 386 | err = thread_db->td_thr_get_info_p (th_p, &ti); |
0d62e5e8 DJ |
387 | if (err != TD_OK) |
388 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
389 | ||
390 | /* Check for zombies. */ | |
391 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) | |
392 | return 0; | |
393 | ||
5f7d1694 PP |
394 | if (!maybe_attach_thread (th_p, &ti, (int *) data)) |
395 | { | |
396 | /* Terminate iteration early: we might be looking at stale data in | |
397 | the inferior. The thread_db_find_new_threads will retry. */ | |
398 | return 1; | |
399 | } | |
0d62e5e8 DJ |
400 | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static void | |
405 | thread_db_find_new_threads (void) | |
406 | { | |
407 | td_err_e err; | |
95954743 | 408 | ptid_t ptid = ((struct inferior_list_entry *) current_inferior)->id; |
cdbfd419 | 409 | struct thread_db *thread_db = current_process ()->private->thread_db; |
5f7d1694 | 410 | int loop, iteration; |
0d62e5e8 | 411 | |
ae13219e DJ |
412 | /* This function is only called when we first initialize thread_db. |
413 | First locate the initial thread. If it is not ready for | |
414 | debugging yet, then stop. */ | |
95954743 | 415 | if (find_one_thread (ptid) == 0) |
ae13219e DJ |
416 | return; |
417 | ||
5f7d1694 PP |
418 | /* Require 4 successive iterations which do not find any new threads. |
419 | The 4 is a heuristic: there is an inherent race here, and I have | |
420 | seen that 2 iterations in a row are not always sufficient to | |
421 | "capture" all threads. */ | |
422 | for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration) | |
423 | { | |
424 | int new_thread_count = 0; | |
425 | ||
426 | /* Iterate over all user-space threads to discover new threads. */ | |
427 | err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent, | |
428 | find_new_threads_callback, | |
429 | &new_thread_count, | |
493e2a69 MS |
430 | TD_THR_ANY_STATE, |
431 | TD_THR_LOWEST_PRIORITY, | |
5f7d1694 PP |
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 | ||
98a5dd13 DE |
700 | /* Handle $sdir in libthread-db-search-path. |
701 | Look for libthread_db in the system dirs, or wherever a plain | |
702 | dlopen(file_without_path) will look. | |
703 | The result is true for success. */ | |
704 | ||
cdbfd419 | 705 | static int |
98a5dd13 DE |
706 | try_thread_db_load_from_sdir (void) |
707 | { | |
708 | return try_thread_db_load (LIBTHREAD_DB_SO); | |
709 | } | |
710 | ||
711 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
712 | The result is true for success. */ | |
713 | ||
714 | static int | |
715 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
cdbfd419 PP |
716 | { |
717 | char path[PATH_MAX]; | |
98a5dd13 DE |
718 | |
719 | if (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
720 | { | |
721 | char *cp = xmalloc (dir_len + 1); | |
722 | ||
723 | memcpy (cp, dir, dir_len); | |
724 | cp[dir_len] = '\0'; | |
725 | warning (_("libthread-db-search-path component too long," | |
726 | " ignored: %s."), cp); | |
727 | free (cp); | |
728 | return 0; | |
729 | } | |
730 | ||
731 | memcpy (path, dir, dir_len); | |
732 | path[dir_len] = '/'; | |
733 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
734 | return try_thread_db_load (path); | |
735 | } | |
736 | ||
737 | /* Search libthread_db_search_path for libthread_db which "agrees" | |
738 | to work on current inferior. | |
739 | The result is true for success. */ | |
740 | ||
741 | static int | |
742 | thread_db_load_search (void) | |
743 | { | |
cdbfd419 PP |
744 | const char *search_path; |
745 | int rc = 0; | |
746 | ||
747 | if (libthread_db_search_path == NULL) | |
748 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
749 | ||
750 | search_path = libthread_db_search_path; | |
751 | while (*search_path) | |
752 | { | |
753 | const char *end = strchr (search_path, ':'); | |
98a5dd13 DE |
754 | const char *this_dir = search_path; |
755 | size_t this_dir_len; | |
756 | ||
cdbfd419 PP |
757 | if (end) |
758 | { | |
98a5dd13 DE |
759 | this_dir_len = end - search_path; |
760 | search_path += this_dir_len + 1; | |
cdbfd419 PP |
761 | } |
762 | else | |
763 | { | |
98a5dd13 DE |
764 | this_dir_len = strlen (this_dir); |
765 | search_path += this_dir_len; | |
766 | } | |
cdbfd419 | 767 | |
98a5dd13 DE |
768 | if (this_dir_len == sizeof ("$pdir") - 1 |
769 | && strncmp (this_dir, "$pdir", this_dir_len) == 0) | |
770 | { | |
771 | /* We don't maintain a list of loaded libraries so we don't know | |
772 | where libpthread lives. We *could* fetch the info, but we don't | |
773 | do that yet. Ignore it. */ | |
774 | } | |
775 | else if (this_dir_len == sizeof ("$sdir") - 1 | |
776 | && strncmp (this_dir, "$sdir", this_dir_len) == 0) | |
777 | { | |
778 | if (try_thread_db_load_from_sdir ()) | |
cdbfd419 | 779 | { |
98a5dd13 | 780 | rc = 1; |
cdbfd419 PP |
781 | break; |
782 | } | |
cdbfd419 | 783 | } |
98a5dd13 | 784 | else |
cdbfd419 | 785 | { |
98a5dd13 DE |
786 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
787 | { | |
788 | rc = 1; | |
789 | break; | |
790 | } | |
cdbfd419 PP |
791 | } |
792 | } | |
cdbfd419 PP |
793 | |
794 | if (debug_threads) | |
795 | fprintf (stderr, "thread_db_load_search returning %d\n", rc); | |
796 | return rc; | |
dae5f5cf DJ |
797 | } |
798 | ||
96f15937 PP |
799 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
800 | ||
0d62e5e8 | 801 | int |
24a09b5f | 802 | thread_db_init (int use_events) |
0d62e5e8 | 803 | { |
95954743 | 804 | struct process_info *proc = current_process (); |
0d62e5e8 | 805 | |
fd500816 DJ |
806 | /* FIXME drow/2004-10-16: This is the "overall process ID", which |
807 | GNU/Linux calls tgid, "thread group ID". When we support | |
808 | attaching to threads, the original thread may not be the correct | |
809 | thread. We would have to get the process ID from /proc for NPTL. | |
810 | For LinuxThreads we could do something similar: follow the chain | |
811 | of parent processes until we find the highest one we're attached | |
812 | to, and use its tgid. | |
813 | ||
814 | This isn't the only place in gdbserver that assumes that the first | |
815 | process in the list is the thread group leader. */ | |
ea025f5f | 816 | |
24a09b5f DJ |
817 | thread_db_use_events = use_events; |
818 | ||
cdbfd419 | 819 | if (thread_db_load_search ()) |
0d62e5e8 | 820 | { |
24a09b5f | 821 | if (use_events && thread_db_enable_reporting () == 0) |
cdbfd419 PP |
822 | { |
823 | /* Keep trying; maybe event reporting will work later. */ | |
8336d594 | 824 | thread_db_mourn (proc); |
cdbfd419 PP |
825 | return 0; |
826 | } | |
0d62e5e8 | 827 | thread_db_find_new_threads (); |
fd500816 | 828 | thread_db_look_up_symbols (); |
0d62e5e8 | 829 | return 1; |
cdbfd419 | 830 | } |
0d62e5e8 | 831 | |
cdbfd419 PP |
832 | return 0; |
833 | } | |
834 | ||
ca5c370d PA |
835 | static int |
836 | any_thread_of (struct inferior_list_entry *entry, void *args) | |
837 | { | |
838 | int *pid_p = args; | |
839 | ||
840 | if (ptid_get_pid (entry->id) == *pid_p) | |
841 | return 1; | |
842 | ||
843 | return 0; | |
844 | } | |
845 | ||
f9e39928 PA |
846 | static void |
847 | switch_to_process (struct process_info *proc) | |
848 | { | |
849 | int pid = pid_of (proc); | |
850 | ||
851 | current_inferior = | |
852 | (struct thread_info *) find_inferior (&all_threads, | |
853 | any_thread_of, &pid); | |
854 | } | |
855 | ||
cdbfd419 PP |
856 | /* Disconnect from libthread_db and free resources. */ |
857 | ||
8336d594 PA |
858 | static void |
859 | disable_thread_event_reporting (struct process_info *proc) | |
cdbfd419 PP |
860 | { |
861 | struct thread_db *thread_db = proc->private->thread_db; | |
862 | if (thread_db) | |
863 | { | |
21e1bee4 PP |
864 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
865 | td_thr_events_t *event); | |
866 | ||
fd7dd3e6 | 867 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
21e1bee4 | 868 | td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event"); |
fd7dd3e6 | 869 | #else |
fd7dd3e6 PA |
870 | td_ta_clear_event_p = &td_ta_clear_event; |
871 | #endif | |
872 | ||
8336d594 | 873 | if (td_ta_clear_event_p != NULL) |
21e1bee4 | 874 | { |
f9e39928 | 875 | struct thread_info *saved_inferior = current_inferior; |
21e1bee4 | 876 | td_thr_events_t events; |
8336d594 | 877 | |
f9e39928 | 878 | switch_to_process (proc); |
21e1bee4 | 879 | |
fd7dd3e6 PA |
880 | /* Set the process wide mask saying we aren't interested |
881 | in any events anymore. */ | |
21e1bee4 PP |
882 | td_event_fillset (&events); |
883 | (*td_ta_clear_event_p) (thread_db->thread_agent, &events); | |
8336d594 PA |
884 | |
885 | current_inferior = saved_inferior; | |
21e1bee4 | 886 | } |
8336d594 PA |
887 | } |
888 | } | |
889 | ||
f9e39928 PA |
890 | static void |
891 | remove_thread_event_breakpoints (struct process_info *proc) | |
892 | { | |
893 | struct thread_db *thread_db = proc->private->thread_db; | |
894 | ||
895 | if (thread_db->td_create_bp != NULL) | |
896 | { | |
897 | struct thread_info *saved_inferior = current_inferior; | |
898 | ||
899 | switch_to_process (proc); | |
900 | ||
901 | delete_breakpoint (thread_db->td_create_bp); | |
902 | thread_db->td_create_bp = NULL; | |
903 | ||
904 | current_inferior = saved_inferior; | |
905 | } | |
906 | } | |
907 | ||
8336d594 PA |
908 | void |
909 | thread_db_detach (struct process_info *proc) | |
910 | { | |
f9e39928 PA |
911 | struct thread_db *thread_db = proc->private->thread_db; |
912 | ||
913 | if (thread_db) | |
914 | { | |
915 | disable_thread_event_reporting (proc); | |
916 | remove_thread_event_breakpoints (proc); | |
917 | } | |
8336d594 PA |
918 | } |
919 | ||
920 | /* Disconnect from libthread_db and free resources. */ | |
921 | ||
922 | void | |
923 | thread_db_mourn (struct process_info *proc) | |
924 | { | |
925 | struct thread_db *thread_db = proc->private->thread_db; | |
926 | if (thread_db) | |
927 | { | |
928 | td_err_e (*td_ta_delete_p) (td_thragent_t *); | |
929 | ||
930 | #ifndef USE_LIBTHREAD_DB_DIRECTLY | |
931 | td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete"); | |
932 | #else | |
933 | td_ta_delete_p = &td_ta_delete; | |
934 | #endif | |
cdbfd419 | 935 | |
cdbfd419 PP |
936 | if (td_ta_delete_p != NULL) |
937 | (*td_ta_delete_p) (thread_db->thread_agent); | |
938 | ||
fd7dd3e6 | 939 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 940 | dlclose (thread_db->handle); |
96f15937 PP |
941 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
942 | ||
cdbfd419 PP |
943 | free (thread_db); |
944 | proc->private->thread_db = NULL; | |
945 | } | |
946 | } | |
947 | ||
948 | /* Handle "set libthread-db-search-path" monitor command and return 1. | |
949 | For any other command, return 0. */ | |
950 | ||
951 | int | |
952 | thread_db_handle_monitor_command (char *mon) | |
953 | { | |
84e578fb DE |
954 | const char *cmd = "set libthread-db-search-path"; |
955 | size_t cmd_len = strlen (cmd); | |
956 | ||
957 | if (strncmp (mon, cmd, cmd_len) == 0 | |
958 | && (mon[cmd_len] == '\0' | |
959 | || mon[cmd_len] == ' ')) | |
cdbfd419 | 960 | { |
84e578fb | 961 | const char *cp = mon + cmd_len; |
cdbfd419 PP |
962 | |
963 | if (libthread_db_search_path != NULL) | |
964 | free (libthread_db_search_path); | |
965 | ||
966 | /* Skip leading space (if any). */ | |
967 | while (isspace (*cp)) | |
968 | ++cp; | |
969 | ||
84e578fb DE |
970 | if (*cp == '\0') |
971 | cp = LIBTHREAD_DB_SEARCH_PATH; | |
cdbfd419 PP |
972 | libthread_db_search_path = xstrdup (cp); |
973 | ||
974 | monitor_output ("libthread-db-search-path set to `"); | |
975 | monitor_output (libthread_db_search_path); | |
976 | monitor_output ("'\n"); | |
977 | return 1; | |
0d62e5e8 DJ |
978 | } |
979 | ||
cdbfd419 | 980 | /* Tell server.c to perform default processing. */ |
0d62e5e8 DJ |
981 | return 0; |
982 | } |