Commit | Line | Data |
---|---|---|
0d62e5e8 | 1 | /* Thread management interface, for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 2002-2015 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" |
125f8a3d | 30 | #include "nat/gdb_thread_db.h" |
e6712ff1 | 31 | #include "gdb_vecs.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); | |
5876f503 JK |
91 | td_err_e (*td_thr_tlsbase_p) (const td_thrhandle_t *th, |
92 | unsigned long int modid, | |
93 | psaddr_t *base); | |
cdbfd419 PP |
94 | const char ** (*td_symbol_list_p) (void); |
95 | }; | |
96 | ||
97 | static char *libthread_db_search_path; | |
186947f7 | 98 | |
95954743 | 99 | static int find_one_thread (ptid_t); |
0d62e5e8 DJ |
100 | static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
101 | ||
54363045 | 102 | static const char * |
0d62e5e8 DJ |
103 | thread_db_err_str (td_err_e err) |
104 | { | |
105 | static char buf[64]; | |
106 | ||
107 | switch (err) | |
108 | { | |
109 | case TD_OK: | |
110 | return "generic 'call succeeded'"; | |
111 | case TD_ERR: | |
112 | return "generic error"; | |
113 | case TD_NOTHR: | |
114 | return "no thread to satisfy query"; | |
115 | case TD_NOSV: | |
116 | return "no sync handle to satisfy query"; | |
117 | case TD_NOLWP: | |
118 | return "no LWP to satisfy query"; | |
119 | case TD_BADPH: | |
120 | return "invalid process handle"; | |
121 | case TD_BADTH: | |
122 | return "invalid thread handle"; | |
123 | case TD_BADSH: | |
124 | return "invalid synchronization handle"; | |
125 | case TD_BADTA: | |
126 | return "invalid thread agent"; | |
127 | case TD_BADKEY: | |
128 | return "invalid key"; | |
129 | case TD_NOMSG: | |
130 | return "no event message for getmsg"; | |
131 | case TD_NOFPREGS: | |
132 | return "FPU register set not available"; | |
133 | case TD_NOLIBTHREAD: | |
134 | return "application not linked with libthread"; | |
135 | case TD_NOEVENT: | |
136 | return "requested event is not supported"; | |
137 | case TD_NOCAPAB: | |
138 | return "capability not available"; | |
139 | case TD_DBERR: | |
140 | return "debugger service failed"; | |
141 | case TD_NOAPLIC: | |
142 | return "operation not applicable to"; | |
143 | case TD_NOTSD: | |
144 | return "no thread-specific data for this thread"; | |
145 | case TD_MALLOC: | |
146 | return "malloc failed"; | |
147 | case TD_PARTIALREG: | |
148 | return "only part of register set was written/read"; | |
149 | case TD_NOXREGS: | |
150 | return "X register set not available for this thread"; | |
3db0444b DJ |
151 | #ifdef HAVE_TD_VERSION |
152 | case TD_VERSION: | |
153 | return "version mismatch between libthread_db and libpthread"; | |
154 | #endif | |
0d62e5e8 | 155 | default: |
6cebaf6e | 156 | xsnprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); |
0d62e5e8 DJ |
157 | return buf; |
158 | } | |
159 | } | |
160 | ||
161 | #if 0 | |
162 | static char * | |
163 | thread_db_state_str (td_thr_state_e state) | |
164 | { | |
165 | static char buf[64]; | |
166 | ||
167 | switch (state) | |
168 | { | |
169 | case TD_THR_STOPPED: | |
170 | return "stopped by debugger"; | |
171 | case TD_THR_RUN: | |
172 | return "runnable"; | |
173 | case TD_THR_ACTIVE: | |
174 | return "active"; | |
175 | case TD_THR_ZOMBIE: | |
176 | return "zombie"; | |
177 | case TD_THR_SLEEP: | |
178 | return "sleeping"; | |
179 | case TD_THR_STOPPED_ASLEEP: | |
180 | return "stopped by debugger AND blocked"; | |
181 | default: | |
6cebaf6e | 182 | xsnprintf (buf, sizeof (buf), "unknown thread_db state %d", state); |
0d62e5e8 DJ |
183 | return buf; |
184 | } | |
185 | } | |
186 | #endif | |
187 | ||
b65d95c5 | 188 | static int |
0d62e5e8 DJ |
189 | thread_db_create_event (CORE_ADDR where) |
190 | { | |
191 | td_event_msg_t msg; | |
192 | td_err_e err; | |
54a0b537 | 193 | struct lwp_info *lwp; |
cdbfd419 PP |
194 | struct thread_db *thread_db = current_process ()->private->thread_db; |
195 | ||
38e08fca | 196 | gdb_assert (thread_db->td_ta_event_getmsg_p != NULL); |
0d62e5e8 DJ |
197 | |
198 | if (debug_threads) | |
87ce2a04 | 199 | debug_printf ("Thread creation event.\n"); |
0d62e5e8 | 200 | |
0d62e5e8 DJ |
201 | /* FIXME: This assumes we don't get another event. |
202 | In the LinuxThreads implementation, this is safe, | |
203 | because all events come from the manager thread | |
204 | (except for its own creation, of course). */ | |
cdbfd419 | 205 | err = thread_db->td_ta_event_getmsg_p (thread_db->thread_agent, &msg); |
0d62e5e8 DJ |
206 | if (err != TD_OK) |
207 | fprintf (stderr, "thread getmsg err: %s\n", | |
208 | thread_db_err_str (err)); | |
209 | ||
4105de34 DJ |
210 | /* If we do not know about the main thread yet, this would be a good time to |
211 | find it. We need to do this to pick up the main thread before any newly | |
212 | created threads. */ | |
0bfdf32f | 213 | lwp = get_thread_lwp (current_thread); |
54a0b537 | 214 | if (lwp->thread_known == 0) |
0bfdf32f | 215 | find_one_thread (current_thread->entry.id); |
4105de34 | 216 | |
0d62e5e8 DJ |
217 | /* msg.event == TD_EVENT_CREATE */ |
218 | ||
219 | find_new_threads_callback (msg.th_p, NULL); | |
b65d95c5 DJ |
220 | |
221 | return 0; | |
0d62e5e8 DJ |
222 | } |
223 | ||
0d62e5e8 | 224 | static int |
f9e39928 | 225 | thread_db_enable_reporting (void) |
0d62e5e8 DJ |
226 | { |
227 | td_thr_events_t events; | |
228 | td_notify_t notify; | |
229 | td_err_e err; | |
cdbfd419 PP |
230 | struct thread_db *thread_db = current_process ()->private->thread_db; |
231 | ||
232 | if (thread_db->td_ta_set_event_p == NULL | |
233 | || thread_db->td_ta_event_addr_p == NULL | |
234 | || thread_db->td_ta_event_getmsg_p == NULL) | |
235 | /* This libthread_db is missing required support. */ | |
236 | return 0; | |
0d62e5e8 DJ |
237 | |
238 | /* Set the process wide mask saying which events we're interested in. */ | |
239 | td_event_emptyset (&events); | |
240 | td_event_addset (&events, TD_CREATE); | |
241 | ||
cdbfd419 | 242 | err = thread_db->td_ta_set_event_p (thread_db->thread_agent, &events); |
0d62e5e8 DJ |
243 | if (err != TD_OK) |
244 | { | |
245 | warning ("Unable to set global thread event mask: %s", | |
1b3f6016 | 246 | thread_db_err_str (err)); |
0d62e5e8 DJ |
247 | return 0; |
248 | } | |
249 | ||
250 | /* Get address for thread creation breakpoint. */ | |
cdbfd419 PP |
251 | err = thread_db->td_ta_event_addr_p (thread_db->thread_agent, TD_CREATE, |
252 | ¬ify); | |
0d62e5e8 DJ |
253 | if (err != TD_OK) |
254 | { | |
255 | warning ("Unable to get location for thread creation breakpoint: %s", | |
256 | thread_db_err_str (err)); | |
257 | return 0; | |
258 | } | |
f9e39928 PA |
259 | thread_db->td_create_bp |
260 | = set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, | |
261 | thread_db_create_event); | |
0d62e5e8 | 262 | |
0d62e5e8 DJ |
263 | return 1; |
264 | } | |
265 | ||
ae13219e | 266 | static int |
95954743 | 267 | find_one_thread (ptid_t ptid) |
0d62e5e8 | 268 | { |
ae13219e DJ |
269 | td_thrhandle_t th; |
270 | td_thrinfo_t ti; | |
0d62e5e8 DJ |
271 | td_err_e err; |
272 | struct thread_info *inferior; | |
54a0b537 | 273 | struct lwp_info *lwp; |
cdbfd419 | 274 | struct thread_db *thread_db = current_process ()->private->thread_db; |
95954743 | 275 | int lwpid = ptid_get_lwp (ptid); |
0d62e5e8 | 276 | |
95954743 | 277 | inferior = (struct thread_info *) find_inferior_id (&all_threads, ptid); |
54a0b537 PA |
278 | lwp = get_thread_lwp (inferior); |
279 | if (lwp->thread_known) | |
ae13219e DJ |
280 | return 1; |
281 | ||
24a09b5f | 282 | /* Get information about this thread. */ |
cdbfd419 | 283 | err = thread_db->td_ta_map_lwp2thr_p (thread_db->thread_agent, lwpid, &th); |
ae13219e | 284 | if (err != TD_OK) |
24a09b5f DJ |
285 | error ("Cannot get thread handle for LWP %d: %s", |
286 | lwpid, thread_db_err_str (err)); | |
ae13219e | 287 | |
cdbfd419 | 288 | err = thread_db->td_thr_get_info_p (&th, &ti); |
ae13219e | 289 | if (err != TD_OK) |
24a09b5f DJ |
290 | error ("Cannot get thread info for LWP %d: %s", |
291 | lwpid, thread_db_err_str (err)); | |
ae13219e DJ |
292 | |
293 | if (debug_threads) | |
87ce2a04 DE |
294 | debug_printf ("Found thread %ld (LWP %d)\n", |
295 | ti.ti_tid, ti.ti_lid); | |
ae13219e | 296 | |
95954743 | 297 | if (lwpid != ti.ti_lid) |
24a09b5f DJ |
298 | { |
299 | warning ("PID mismatch! Expected %ld, got %ld", | |
95954743 | 300 | (long) lwpid, (long) ti.ti_lid); |
24a09b5f DJ |
301 | return 0; |
302 | } | |
ae13219e | 303 | |
24a09b5f | 304 | if (thread_db_use_events) |
0d62e5e8 | 305 | { |
cdbfd419 | 306 | err = thread_db->td_thr_event_enable_p (&th, 1); |
ae13219e DJ |
307 | if (err != TD_OK) |
308 | error ("Cannot enable thread event reporting for %d: %s", | |
309 | ti.ti_lid, thread_db_err_str (err)); | |
0d62e5e8 | 310 | } |
ae13219e | 311 | |
24a09b5f DJ |
312 | /* If the new thread ID is zero, a final thread ID will be available |
313 | later. Do not enable thread debugging yet. */ | |
314 | if (ti.ti_tid == 0) | |
315 | return 0; | |
ae13219e | 316 | |
54a0b537 PA |
317 | lwp->thread_known = 1; |
318 | lwp->th = th; | |
ae13219e | 319 | |
ae13219e DJ |
320 | return 1; |
321 | } | |
322 | ||
5f7d1694 PP |
323 | /* Attach a thread. Return true on success. */ |
324 | ||
325 | static int | |
326 | attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p) | |
ae13219e | 327 | { |
7ae1a6a6 PA |
328 | struct process_info *proc = current_process (); |
329 | int pid = pid_of (proc); | |
330 | ptid_t ptid = ptid_build (pid, ti_p->ti_lid, 0); | |
54a0b537 | 331 | struct lwp_info *lwp; |
7ae1a6a6 | 332 | int err; |
ae13219e | 333 | |
0d62e5e8 | 334 | if (debug_threads) |
87ce2a04 DE |
335 | debug_printf ("Attaching to thread %ld (LWP %d)\n", |
336 | ti_p->ti_tid, ti_p->ti_lid); | |
7ae1a6a6 PA |
337 | err = linux_attach_lwp (ptid); |
338 | if (err != 0) | |
0d62e5e8 | 339 | { |
7ae1a6a6 PA |
340 | warning ("Could not attach to thread %ld (LWP %d): %s\n", |
341 | ti_p->ti_tid, ti_p->ti_lid, | |
8784d563 | 342 | linux_ptrace_attach_fail_reason_string (ptid, err)); |
5f7d1694 | 343 | return 0; |
0d62e5e8 DJ |
344 | } |
345 | ||
7ae1a6a6 PA |
346 | lwp = find_lwp_pid (ptid); |
347 | gdb_assert (lwp != NULL); | |
54a0b537 PA |
348 | lwp->thread_known = 1; |
349 | lwp->th = *th_p; | |
24a09b5f DJ |
350 | |
351 | if (thread_db_use_events) | |
352 | { | |
5f7d1694 | 353 | td_err_e err; |
7ae1a6a6 | 354 | struct thread_db *thread_db = proc->private->thread_db; |
5f7d1694 | 355 | |
cdbfd419 | 356 | err = thread_db->td_thr_event_enable_p (th_p, 1); |
24a09b5f DJ |
357 | if (err != TD_OK) |
358 | error ("Cannot enable thread event reporting for %d: %s", | |
359 | ti_p->ti_lid, thread_db_err_str (err)); | |
360 | } | |
5f7d1694 PP |
361 | |
362 | return 1; | |
363 | } | |
364 | ||
365 | /* Attach thread if we haven't seen it yet. | |
366 | Increment *COUNTER if we have attached a new thread. | |
367 | Return false on failure. */ | |
368 | ||
369 | static int | |
370 | maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p, | |
371 | int *counter) | |
372 | { | |
373 | struct lwp_info *lwp; | |
374 | ||
375 | lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); | |
376 | if (lwp != NULL) | |
377 | return 1; | |
378 | ||
379 | if (!attach_thread (th_p, ti_p)) | |
380 | return 0; | |
381 | ||
382 | if (counter != NULL) | |
383 | *counter += 1; | |
384 | ||
385 | return 1; | |
0d62e5e8 DJ |
386 | } |
387 | ||
388 | static int | |
389 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
390 | { | |
391 | td_thrinfo_t ti; | |
392 | td_err_e err; | |
cdbfd419 | 393 | struct thread_db *thread_db = current_process ()->private->thread_db; |
0d62e5e8 | 394 | |
cdbfd419 | 395 | err = thread_db->td_thr_get_info_p (th_p, &ti); |
0d62e5e8 DJ |
396 | if (err != TD_OK) |
397 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
398 | ||
a33e3959 PA |
399 | if (ti.ti_lid == -1) |
400 | { | |
401 | /* A thread with kernel thread ID -1 is either a thread that | |
402 | exited and was joined, or a thread that is being created but | |
403 | hasn't started yet, and that is reusing the tcb/stack of a | |
404 | thread that previously exited and was joined. (glibc marks | |
405 | terminated and joined threads with kernel thread ID -1. See | |
406 | glibc PR17707. */ | |
407 | return 0; | |
408 | } | |
409 | ||
0d62e5e8 DJ |
410 | /* Check for zombies. */ |
411 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) | |
412 | return 0; | |
413 | ||
5f7d1694 PP |
414 | if (!maybe_attach_thread (th_p, &ti, (int *) data)) |
415 | { | |
416 | /* Terminate iteration early: we might be looking at stale data in | |
417 | the inferior. The thread_db_find_new_threads will retry. */ | |
418 | return 1; | |
419 | } | |
0d62e5e8 DJ |
420 | |
421 | return 0; | |
422 | } | |
423 | ||
424 | static void | |
425 | thread_db_find_new_threads (void) | |
426 | { | |
427 | td_err_e err; | |
fbd5db48 | 428 | ptid_t ptid = current_ptid; |
cdbfd419 | 429 | struct thread_db *thread_db = current_process ()->private->thread_db; |
5f7d1694 | 430 | int loop, iteration; |
0d62e5e8 | 431 | |
ae13219e DJ |
432 | /* This function is only called when we first initialize thread_db. |
433 | First locate the initial thread. If it is not ready for | |
434 | debugging yet, then stop. */ | |
95954743 | 435 | if (find_one_thread (ptid) == 0) |
ae13219e DJ |
436 | return; |
437 | ||
5f7d1694 PP |
438 | /* Require 4 successive iterations which do not find any new threads. |
439 | The 4 is a heuristic: there is an inherent race here, and I have | |
440 | seen that 2 iterations in a row are not always sufficient to | |
441 | "capture" all threads. */ | |
442 | for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration) | |
443 | { | |
444 | int new_thread_count = 0; | |
445 | ||
446 | /* Iterate over all user-space threads to discover new threads. */ | |
447 | err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent, | |
448 | find_new_threads_callback, | |
449 | &new_thread_count, | |
493e2a69 MS |
450 | TD_THR_ANY_STATE, |
451 | TD_THR_LOWEST_PRIORITY, | |
5f7d1694 PP |
452 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); |
453 | if (debug_threads) | |
87ce2a04 DE |
454 | debug_printf ("Found %d threads in iteration %d.\n", |
455 | new_thread_count, iteration); | |
5f7d1694 PP |
456 | |
457 | if (new_thread_count != 0) | |
458 | { | |
459 | /* Found new threads. Restart iteration from beginning. */ | |
460 | loop = -1; | |
461 | } | |
462 | } | |
0d62e5e8 DJ |
463 | if (err != TD_OK) |
464 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
465 | } | |
466 | ||
fd500816 DJ |
467 | /* Cache all future symbols that thread_db might request. We can not |
468 | request symbols at arbitrary states in the remote protocol, only | |
469 | when the client tells us that new symbols are available. So when | |
470 | we load the thread library, make sure to check the entire list. */ | |
471 | ||
472 | static void | |
473 | thread_db_look_up_symbols (void) | |
474 | { | |
cdbfd419 PP |
475 | struct thread_db *thread_db = current_process ()->private->thread_db; |
476 | const char **sym_list; | |
fd500816 DJ |
477 | CORE_ADDR unused; |
478 | ||
cdbfd419 | 479 | for (sym_list = thread_db->td_symbol_list_p (); *sym_list; sym_list++) |
9836d6ea PA |
480 | look_up_one_symbol (*sym_list, &unused, 1); |
481 | ||
482 | /* We're not interested in any other libraries loaded after this | |
483 | point, only in symbols in libpthread.so. */ | |
484 | thread_db->all_symbols_looked_up = 1; | |
485 | } | |
486 | ||
487 | int | |
488 | thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp) | |
489 | { | |
490 | struct thread_db *thread_db = current_process ()->private->thread_db; | |
491 | int may_ask_gdb = !thread_db->all_symbols_looked_up; | |
492 | ||
493 | /* If we've passed the call to thread_db_look_up_symbols, then | |
494 | anything not in the cache must not exist; we're not interested | |
495 | in any libraries loaded after that point, only in symbols in | |
496 | libpthread.so. It might not be an appropriate time to look | |
497 | up a symbol, e.g. while we're trying to fetch registers. */ | |
498 | return look_up_one_symbol (name, addrp, may_ask_gdb); | |
fd500816 DJ |
499 | } |
500 | ||
dae5f5cf DJ |
501 | int |
502 | thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, | |
503 | CORE_ADDR load_module, CORE_ADDR *address) | |
504 | { | |
dae5f5cf DJ |
505 | psaddr_t addr; |
506 | td_err_e err; | |
54a0b537 | 507 | struct lwp_info *lwp; |
0bfdf32f | 508 | struct thread_info *saved_thread; |
cdbfd419 PP |
509 | struct process_info *proc; |
510 | struct thread_db *thread_db; | |
511 | ||
512 | proc = get_thread_process (thread); | |
513 | thread_db = proc->private->thread_db; | |
dae5f5cf | 514 | |
7fe519cb | 515 | /* If the thread layer is not (yet) initialized, fail. */ |
8a4ac37e | 516 | if (thread_db == NULL || !thread_db->all_symbols_looked_up) |
7fe519cb UW |
517 | return TD_ERR; |
518 | ||
5876f503 JK |
519 | /* If td_thr_tls_get_addr is missing rather do not expect td_thr_tlsbase |
520 | could work. */ | |
521 | if (thread_db->td_thr_tls_get_addr_p == NULL | |
522 | || (load_module == 0 && thread_db->td_thr_tlsbase_p == NULL)) | |
cdbfd419 PP |
523 | return -1; |
524 | ||
54a0b537 PA |
525 | lwp = get_thread_lwp (thread); |
526 | if (!lwp->thread_known) | |
80894984 | 527 | find_one_thread (thread->entry.id); |
54a0b537 | 528 | if (!lwp->thread_known) |
dae5f5cf DJ |
529 | return TD_NOTHR; |
530 | ||
0bfdf32f GB |
531 | saved_thread = current_thread; |
532 | current_thread = thread; | |
5876f503 JK |
533 | |
534 | if (load_module != 0) | |
535 | { | |
536 | /* Note the cast through uintptr_t: this interface only works if | |
537 | a target address fits in a psaddr_t, which is a host pointer. | |
538 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
539 | err = thread_db->td_thr_tls_get_addr_p (&lwp->th, | |
540 | (psaddr_t) (uintptr_t) load_module, | |
541 | offset, &addr); | |
542 | } | |
543 | else | |
544 | { | |
545 | /* This code path handles the case of -static -pthread executables: | |
546 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
547 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
548 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
549 | The constant number 1 depends on GNU __libc_setup_tls | |
550 | initialization of l_tls_modid to 1. */ | |
551 | err = thread_db->td_thr_tlsbase_p (&lwp->th, 1, &addr); | |
552 | addr = (char *) addr + offset; | |
553 | } | |
554 | ||
0bfdf32f | 555 | current_thread = saved_thread; |
dae5f5cf DJ |
556 | if (err == TD_OK) |
557 | { | |
186947f7 | 558 | *address = (CORE_ADDR) (uintptr_t) addr; |
dae5f5cf DJ |
559 | return 0; |
560 | } | |
561 | else | |
562 | return err; | |
cdbfd419 PP |
563 | } |
564 | ||
96f15937 PP |
565 | #ifdef USE_LIBTHREAD_DB_DIRECTLY |
566 | ||
567 | static int | |
568 | thread_db_load_search (void) | |
569 | { | |
570 | td_err_e err; | |
9836d6ea | 571 | struct thread_db *tdb; |
96f15937 PP |
572 | struct process_info *proc = current_process (); |
573 | ||
38e08fca | 574 | gdb_assert (proc->private->thread_db == NULL); |
96f15937 | 575 | |
9836d6ea PA |
576 | tdb = xcalloc (1, sizeof (*tdb)); |
577 | proc->private->thread_db = tdb; | |
f9e39928 | 578 | |
9836d6ea | 579 | tdb->td_ta_new_p = &td_ta_new; |
96f15937 PP |
580 | |
581 | /* Attempt to open a connection to the thread library. */ | |
9836d6ea | 582 | err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
96f15937 PP |
583 | if (err != TD_OK) |
584 | { | |
585 | if (debug_threads) | |
87ce2a04 | 586 | debug_printf ("td_ta_new(): %s\n", thread_db_err_str (err)); |
9836d6ea PA |
587 | free (tdb); |
588 | proc->private->thread_db = NULL; | |
96f15937 PP |
589 | return 0; |
590 | } | |
591 | ||
9836d6ea PA |
592 | tdb->td_ta_map_lwp2thr_p = &td_ta_map_lwp2thr; |
593 | tdb->td_thr_get_info_p = &td_thr_get_info; | |
594 | tdb->td_ta_thr_iter_p = &td_ta_thr_iter; | |
595 | tdb->td_symbol_list_p = &td_symbol_list; | |
96f15937 PP |
596 | |
597 | /* This is required only when thread_db_use_events is on. */ | |
9836d6ea | 598 | tdb->td_thr_event_enable_p = &td_thr_event_enable; |
96f15937 PP |
599 | |
600 | /* These are not essential. */ | |
9836d6ea PA |
601 | tdb->td_ta_event_addr_p = &td_ta_event_addr; |
602 | tdb->td_ta_set_event_p = &td_ta_set_event; | |
603 | tdb->td_ta_event_getmsg_p = &td_ta_event_getmsg; | |
604 | tdb->td_thr_tls_get_addr_p = &td_thr_tls_get_addr; | |
5876f503 | 605 | tdb->td_thr_tlsbase_p = &td_thr_tlsbase; |
96f15937 PP |
606 | |
607 | return 1; | |
608 | } | |
609 | ||
610 | #else | |
611 | ||
cdbfd419 PP |
612 | static int |
613 | try_thread_db_load_1 (void *handle) | |
614 | { | |
615 | td_err_e err; | |
9836d6ea | 616 | struct thread_db *tdb; |
cdbfd419 PP |
617 | struct process_info *proc = current_process (); |
618 | ||
38e08fca | 619 | gdb_assert (proc->private->thread_db == NULL); |
cdbfd419 | 620 | |
9836d6ea PA |
621 | tdb = xcalloc (1, sizeof (*tdb)); |
622 | proc->private->thread_db = tdb; | |
f9e39928 | 623 | |
9836d6ea | 624 | tdb->handle = handle; |
cdbfd419 PP |
625 | |
626 | /* Initialize pointers to the dynamic library functions we will use. | |
627 | Essential functions first. */ | |
628 | ||
629 | #define CHK(required, a) \ | |
630 | do \ | |
631 | { \ | |
632 | if ((a) == NULL) \ | |
633 | { \ | |
634 | if (debug_threads) \ | |
87ce2a04 | 635 | debug_printf ("dlsym: %s\n", dlerror ()); \ |
cdbfd419 | 636 | if (required) \ |
9836d6ea PA |
637 | { \ |
638 | free (tdb); \ | |
639 | proc->private->thread_db = NULL; \ | |
640 | return 0; \ | |
641 | } \ | |
cdbfd419 PP |
642 | } \ |
643 | } \ | |
644 | while (0) | |
645 | ||
9836d6ea | 646 | CHK (1, tdb->td_ta_new_p = dlsym (handle, "td_ta_new")); |
cdbfd419 PP |
647 | |
648 | /* Attempt to open a connection to the thread library. */ | |
9836d6ea | 649 | err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
cdbfd419 PP |
650 | if (err != TD_OK) |
651 | { | |
652 | if (debug_threads) | |
87ce2a04 | 653 | debug_printf ("td_ta_new(): %s\n", thread_db_err_str (err)); |
9836d6ea PA |
654 | free (tdb); |
655 | proc->private->thread_db = NULL; | |
cdbfd419 PP |
656 | return 0; |
657 | } | |
658 | ||
9836d6ea PA |
659 | CHK (1, tdb->td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr")); |
660 | CHK (1, tdb->td_thr_get_info_p = dlsym (handle, "td_thr_get_info")); | |
661 | CHK (1, tdb->td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter")); | |
662 | CHK (1, tdb->td_symbol_list_p = dlsym (handle, "td_symbol_list")); | |
cdbfd419 PP |
663 | |
664 | /* This is required only when thread_db_use_events is on. */ | |
665 | CHK (thread_db_use_events, | |
9836d6ea | 666 | tdb->td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable")); |
cdbfd419 PP |
667 | |
668 | /* These are not essential. */ | |
9836d6ea PA |
669 | CHK (0, tdb->td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr")); |
670 | CHK (0, tdb->td_ta_set_event_p = dlsym (handle, "td_ta_set_event")); | |
671 | CHK (0, tdb->td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg")); | |
672 | CHK (0, tdb->td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr")); | |
5876f503 | 673 | CHK (0, tdb->td_thr_tlsbase_p = dlsym (handle, "td_thr_tlsbase")); |
cdbfd419 PP |
674 | |
675 | #undef CHK | |
676 | ||
cdbfd419 PP |
677 | return 1; |
678 | } | |
679 | ||
10e86dd7 DE |
680 | #ifdef HAVE_DLADDR |
681 | ||
cdbfd419 PP |
682 | /* Lookup a library in which given symbol resides. |
683 | Note: this is looking in the GDBSERVER process, not in the inferior. | |
684 | Returns library name, or NULL. */ | |
685 | ||
686 | static const char * | |
687 | dladdr_to_soname (const void *addr) | |
688 | { | |
689 | Dl_info info; | |
690 | ||
691 | if (dladdr (addr, &info) != 0) | |
692 | return info.dli_fname; | |
693 | return NULL; | |
694 | } | |
695 | ||
10e86dd7 DE |
696 | #endif |
697 | ||
cdbfd419 PP |
698 | static int |
699 | try_thread_db_load (const char *library) | |
700 | { | |
701 | void *handle; | |
702 | ||
703 | if (debug_threads) | |
87ce2a04 DE |
704 | debug_printf ("Trying host libthread_db library: %s.\n", |
705 | library); | |
cdbfd419 PP |
706 | handle = dlopen (library, RTLD_NOW); |
707 | if (handle == NULL) | |
708 | { | |
709 | if (debug_threads) | |
87ce2a04 | 710 | debug_printf ("dlopen failed: %s.\n", dlerror ()); |
cdbfd419 PP |
711 | return 0; |
712 | } | |
713 | ||
10e86dd7 | 714 | #ifdef HAVE_DLADDR |
cdbfd419 PP |
715 | if (debug_threads && strchr (library, '/') == NULL) |
716 | { | |
717 | void *td_init; | |
718 | ||
719 | td_init = dlsym (handle, "td_init"); | |
720 | if (td_init != NULL) | |
721 | { | |
722 | const char *const libpath = dladdr_to_soname (td_init); | |
723 | ||
724 | if (libpath != NULL) | |
725 | fprintf (stderr, "Host %s resolved to: %s.\n", | |
726 | library, libpath); | |
727 | } | |
728 | } | |
10e86dd7 | 729 | #endif |
cdbfd419 PP |
730 | |
731 | if (try_thread_db_load_1 (handle)) | |
732 | return 1; | |
733 | ||
734 | /* This library "refused" to work on current inferior. */ | |
735 | dlclose (handle); | |
736 | return 0; | |
737 | } | |
738 | ||
98a5dd13 DE |
739 | /* Handle $sdir in libthread-db-search-path. |
740 | Look for libthread_db in the system dirs, or wherever a plain | |
741 | dlopen(file_without_path) will look. | |
742 | The result is true for success. */ | |
743 | ||
cdbfd419 | 744 | static int |
98a5dd13 DE |
745 | try_thread_db_load_from_sdir (void) |
746 | { | |
747 | return try_thread_db_load (LIBTHREAD_DB_SO); | |
748 | } | |
749 | ||
750 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
751 | The result is true for success. */ | |
752 | ||
753 | static int | |
754 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
cdbfd419 PP |
755 | { |
756 | char path[PATH_MAX]; | |
98a5dd13 DE |
757 | |
758 | if (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
759 | { | |
760 | char *cp = xmalloc (dir_len + 1); | |
761 | ||
762 | memcpy (cp, dir, dir_len); | |
763 | cp[dir_len] = '\0'; | |
764 | warning (_("libthread-db-search-path component too long," | |
765 | " ignored: %s."), cp); | |
766 | free (cp); | |
767 | return 0; | |
768 | } | |
769 | ||
770 | memcpy (path, dir, dir_len); | |
771 | path[dir_len] = '/'; | |
772 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
773 | return try_thread_db_load (path); | |
774 | } | |
775 | ||
776 | /* Search libthread_db_search_path for libthread_db which "agrees" | |
777 | to work on current inferior. | |
778 | The result is true for success. */ | |
779 | ||
780 | static int | |
781 | thread_db_load_search (void) | |
782 | { | |
e6712ff1 DE |
783 | VEC (char_ptr) *dir_vec; |
784 | char *this_dir; | |
785 | int i, rc = 0; | |
cdbfd419 PP |
786 | |
787 | if (libthread_db_search_path == NULL) | |
788 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
789 | ||
e6712ff1 DE |
790 | dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path); |
791 | ||
792 | for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i) | |
cdbfd419 | 793 | { |
e6712ff1 | 794 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 DE |
795 | size_t this_dir_len; |
796 | ||
e6712ff1 | 797 | this_dir_len = strlen (this_dir); |
cdbfd419 | 798 | |
e6712ff1 DE |
799 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
800 | && (this_dir[pdir_len] == '\0' | |
801 | || this_dir[pdir_len] == '/')) | |
98a5dd13 DE |
802 | { |
803 | /* We don't maintain a list of loaded libraries so we don't know | |
804 | where libpthread lives. We *could* fetch the info, but we don't | |
805 | do that yet. Ignore it. */ | |
806 | } | |
e6712ff1 | 807 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
808 | { |
809 | if (try_thread_db_load_from_sdir ()) | |
cdbfd419 | 810 | { |
98a5dd13 | 811 | rc = 1; |
cdbfd419 PP |
812 | break; |
813 | } | |
cdbfd419 | 814 | } |
98a5dd13 | 815 | else |
cdbfd419 | 816 | { |
98a5dd13 DE |
817 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
818 | { | |
819 | rc = 1; | |
820 | break; | |
821 | } | |
cdbfd419 PP |
822 | } |
823 | } | |
cdbfd419 | 824 | |
e6712ff1 | 825 | free_char_ptr_vec (dir_vec); |
cdbfd419 | 826 | if (debug_threads) |
87ce2a04 | 827 | debug_printf ("thread_db_load_search returning %d\n", rc); |
cdbfd419 | 828 | return rc; |
dae5f5cf DJ |
829 | } |
830 | ||
96f15937 PP |
831 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
832 | ||
0d62e5e8 | 833 | int |
24a09b5f | 834 | thread_db_init (int use_events) |
0d62e5e8 | 835 | { |
95954743 | 836 | struct process_info *proc = current_process (); |
0d62e5e8 | 837 | |
fd500816 DJ |
838 | /* FIXME drow/2004-10-16: This is the "overall process ID", which |
839 | GNU/Linux calls tgid, "thread group ID". When we support | |
840 | attaching to threads, the original thread may not be the correct | |
841 | thread. We would have to get the process ID from /proc for NPTL. | |
842 | For LinuxThreads we could do something similar: follow the chain | |
843 | of parent processes until we find the highest one we're attached | |
844 | to, and use its tgid. | |
845 | ||
846 | This isn't the only place in gdbserver that assumes that the first | |
847 | process in the list is the thread group leader. */ | |
ea025f5f | 848 | |
24a09b5f DJ |
849 | thread_db_use_events = use_events; |
850 | ||
cdbfd419 | 851 | if (thread_db_load_search ()) |
0d62e5e8 | 852 | { |
24a09b5f | 853 | if (use_events && thread_db_enable_reporting () == 0) |
cdbfd419 PP |
854 | { |
855 | /* Keep trying; maybe event reporting will work later. */ | |
8336d594 | 856 | thread_db_mourn (proc); |
cdbfd419 PP |
857 | return 0; |
858 | } | |
0d62e5e8 | 859 | thread_db_find_new_threads (); |
fd500816 | 860 | thread_db_look_up_symbols (); |
0d62e5e8 | 861 | return 1; |
cdbfd419 | 862 | } |
0d62e5e8 | 863 | |
cdbfd419 PP |
864 | return 0; |
865 | } | |
866 | ||
ca5c370d PA |
867 | static int |
868 | any_thread_of (struct inferior_list_entry *entry, void *args) | |
869 | { | |
870 | int *pid_p = args; | |
871 | ||
872 | if (ptid_get_pid (entry->id) == *pid_p) | |
873 | return 1; | |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
f9e39928 PA |
878 | static void |
879 | switch_to_process (struct process_info *proc) | |
880 | { | |
881 | int pid = pid_of (proc); | |
882 | ||
0bfdf32f | 883 | current_thread = |
f9e39928 PA |
884 | (struct thread_info *) find_inferior (&all_threads, |
885 | any_thread_of, &pid); | |
886 | } | |
887 | ||
cdbfd419 PP |
888 | /* Disconnect from libthread_db and free resources. */ |
889 | ||
8336d594 PA |
890 | static void |
891 | disable_thread_event_reporting (struct process_info *proc) | |
cdbfd419 PP |
892 | { |
893 | struct thread_db *thread_db = proc->private->thread_db; | |
894 | if (thread_db) | |
895 | { | |
21e1bee4 PP |
896 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
897 | td_thr_events_t *event); | |
898 | ||
fd7dd3e6 | 899 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
21e1bee4 | 900 | td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event"); |
fd7dd3e6 | 901 | #else |
fd7dd3e6 PA |
902 | td_ta_clear_event_p = &td_ta_clear_event; |
903 | #endif | |
904 | ||
8336d594 | 905 | if (td_ta_clear_event_p != NULL) |
21e1bee4 | 906 | { |
0bfdf32f | 907 | struct thread_info *saved_thread = current_thread; |
21e1bee4 | 908 | td_thr_events_t events; |
8336d594 | 909 | |
f9e39928 | 910 | switch_to_process (proc); |
21e1bee4 | 911 | |
fd7dd3e6 PA |
912 | /* Set the process wide mask saying we aren't interested |
913 | in any events anymore. */ | |
21e1bee4 PP |
914 | td_event_fillset (&events); |
915 | (*td_ta_clear_event_p) (thread_db->thread_agent, &events); | |
8336d594 | 916 | |
0bfdf32f | 917 | current_thread = saved_thread; |
21e1bee4 | 918 | } |
8336d594 PA |
919 | } |
920 | } | |
921 | ||
f9e39928 PA |
922 | static void |
923 | remove_thread_event_breakpoints (struct process_info *proc) | |
924 | { | |
925 | struct thread_db *thread_db = proc->private->thread_db; | |
926 | ||
927 | if (thread_db->td_create_bp != NULL) | |
928 | { | |
0bfdf32f | 929 | struct thread_info *saved_thread = current_thread; |
f9e39928 PA |
930 | |
931 | switch_to_process (proc); | |
932 | ||
933 | delete_breakpoint (thread_db->td_create_bp); | |
934 | thread_db->td_create_bp = NULL; | |
935 | ||
0bfdf32f | 936 | current_thread = saved_thread; |
f9e39928 PA |
937 | } |
938 | } | |
939 | ||
8336d594 PA |
940 | void |
941 | thread_db_detach (struct process_info *proc) | |
942 | { | |
f9e39928 PA |
943 | struct thread_db *thread_db = proc->private->thread_db; |
944 | ||
945 | if (thread_db) | |
946 | { | |
947 | disable_thread_event_reporting (proc); | |
948 | remove_thread_event_breakpoints (proc); | |
949 | } | |
8336d594 PA |
950 | } |
951 | ||
952 | /* Disconnect from libthread_db and free resources. */ | |
953 | ||
954 | void | |
955 | thread_db_mourn (struct process_info *proc) | |
956 | { | |
957 | struct thread_db *thread_db = proc->private->thread_db; | |
958 | if (thread_db) | |
959 | { | |
960 | td_err_e (*td_ta_delete_p) (td_thragent_t *); | |
961 | ||
962 | #ifndef USE_LIBTHREAD_DB_DIRECTLY | |
963 | td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete"); | |
964 | #else | |
965 | td_ta_delete_p = &td_ta_delete; | |
966 | #endif | |
cdbfd419 | 967 | |
cdbfd419 PP |
968 | if (td_ta_delete_p != NULL) |
969 | (*td_ta_delete_p) (thread_db->thread_agent); | |
970 | ||
fd7dd3e6 | 971 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 972 | dlclose (thread_db->handle); |
96f15937 PP |
973 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
974 | ||
cdbfd419 PP |
975 | free (thread_db); |
976 | proc->private->thread_db = NULL; | |
977 | } | |
978 | } | |
979 | ||
980 | /* Handle "set libthread-db-search-path" monitor command and return 1. | |
981 | For any other command, return 0. */ | |
982 | ||
983 | int | |
984 | thread_db_handle_monitor_command (char *mon) | |
985 | { | |
84e578fb DE |
986 | const char *cmd = "set libthread-db-search-path"; |
987 | size_t cmd_len = strlen (cmd); | |
988 | ||
989 | if (strncmp (mon, cmd, cmd_len) == 0 | |
990 | && (mon[cmd_len] == '\0' | |
991 | || mon[cmd_len] == ' ')) | |
cdbfd419 | 992 | { |
84e578fb | 993 | const char *cp = mon + cmd_len; |
cdbfd419 PP |
994 | |
995 | if (libthread_db_search_path != NULL) | |
996 | free (libthread_db_search_path); | |
997 | ||
998 | /* Skip leading space (if any). */ | |
999 | while (isspace (*cp)) | |
1000 | ++cp; | |
1001 | ||
84e578fb DE |
1002 | if (*cp == '\0') |
1003 | cp = LIBTHREAD_DB_SEARCH_PATH; | |
cdbfd419 PP |
1004 | libthread_db_search_path = xstrdup (cp); |
1005 | ||
1006 | monitor_output ("libthread-db-search-path set to `"); | |
1007 | monitor_output (libthread_db_search_path); | |
1008 | monitor_output ("'\n"); | |
1009 | return 1; | |
0d62e5e8 DJ |
1010 | } |
1011 | ||
cdbfd419 | 1012 | /* Tell server.c to perform default processing. */ |
0d62e5e8 DJ |
1013 | return 0; |
1014 | } |