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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
0fb0cc75 | 3 | Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
10d6c8cd | 4 | Free Software Foundation, Inc. |
fb0e1ba7 MK |
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 |
fb0e1ba7 MK |
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/>. */ |
fb0e1ba7 MK |
20 | |
21 | #include "defs.h" | |
22 | ||
23 | #include "gdb_assert.h" | |
24 | #include <dlfcn.h> | |
25 | #include "gdb_proc_service.h" | |
26 | #include "gdb_thread_db.h" | |
27 | ||
bda9cb72 | 28 | #include "bfd.h" |
17a37d48 | 29 | #include "command.h" |
93ad78a7 | 30 | #include "exceptions.h" |
17a37d48 | 31 | #include "gdbcmd.h" |
fb0e1ba7 MK |
32 | #include "gdbthread.h" |
33 | #include "inferior.h" | |
bda9cb72 MK |
34 | #include "symfile.h" |
35 | #include "objfiles.h" | |
fb0e1ba7 | 36 | #include "target.h" |
4e052eda | 37 | #include "regcache.h" |
17a37d48 | 38 | #include "solib.h" |
3f47be5c | 39 | #include "solib-svr4.h" |
16451949 | 40 | #include "gdbcore.h" |
06d3b283 | 41 | #include "observer.h" |
0ec9a092 | 42 | #include "linux-nat.h" |
fb0e1ba7 | 43 | |
979894f2 NR |
44 | #include <signal.h> |
45 | ||
a2f23071 DJ |
46 | #ifdef HAVE_GNU_LIBC_VERSION_H |
47 | #include <gnu/libc-version.h> | |
48 | #endif | |
49 | ||
17faa917 DJ |
50 | /* GNU/Linux libthread_db support. |
51 | ||
52 | libthread_db is a library, provided along with libpthread.so, which | |
53 | exposes the internals of the thread library to a debugger. It | |
54 | allows GDB to find existing threads, new threads as they are | |
55 | created, thread IDs (usually, the result of pthread_self), and | |
56 | thread-local variables. | |
57 | ||
58 | The libthread_db interface originates on Solaris, where it is | |
59 | both more powerful and more complicated. This implementation | |
60 | only works for LinuxThreads and NPTL, the two glibc threading | |
61 | libraries. It assumes that each thread is permanently assigned | |
62 | to a single light-weight process (LWP). | |
63 | ||
64 | libthread_db-specific information is stored in the "private" field | |
65 | of struct thread_info. When the field is NULL we do not yet have | |
66 | information about the new thread; this could be temporary (created, | |
67 | but the thread library's data structures do not reflect it yet) | |
68 | or permanent (created using clone instead of pthread_create). | |
69 | ||
70 | Process IDs managed by linux-thread-db.c match those used by | |
71 | linux-nat.c: a common PID for all processes, an LWP ID for each | |
72 | thread, and no TID. We save the TID in private. Keeping it out | |
73 | of the ptid_t prevents thread IDs changing when libpthread is | |
74 | loaded or unloaded. */ | |
75 | ||
17a37d48 PP |
76 | static char *libthread_db_search_path; |
77 | ||
8605d56e AC |
78 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
79 | threads. */ | |
fb0e1ba7 | 80 | |
fb0e1ba7 MK |
81 | /* This module's target vector. */ |
82 | static struct target_ops thread_db_ops; | |
83 | ||
fb0e1ba7 MK |
84 | /* Non-zero if we have determined the signals used by the threads |
85 | library. */ | |
86 | static int thread_signals; | |
87 | static sigset_t thread_stop_set; | |
88 | static sigset_t thread_print_set; | |
89 | ||
d90e17a7 PA |
90 | struct thread_db_info |
91 | { | |
92 | struct thread_db_info *next; | |
93 | ||
94 | /* Process id this object refers to. */ | |
95 | int pid; | |
96 | ||
97 | /* Handle from dlopen for libthread_db.so. */ | |
98 | void *handle; | |
99 | ||
100 | /* Structure that identifies the child process for the | |
101 | <proc_service.h> interface. */ | |
102 | struct ps_prochandle proc_handle; | |
103 | ||
104 | /* Connection to the libthread_db library. */ | |
105 | td_thragent_t *thread_agent; | |
106 | ||
4d062f1a PA |
107 | /* True if we need to apply the workaround for glibc/BZ5983. When |
108 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
109 | list, nptl_db returns the parent's threads in addition to the new | |
110 | (single) child thread. If this flag is set, we do extra work to | |
111 | be able to ignore such stale entries. */ | |
112 | int need_stale_parent_threads_check; | |
113 | ||
d90e17a7 PA |
114 | /* Location of the thread creation event breakpoint. The code at |
115 | this location in the child process will be called by the pthread | |
116 | library whenever a new thread is created. By setting a special | |
117 | breakpoint at this location, GDB can detect when a new thread is | |
118 | created. We obtain this location via the td_ta_event_addr | |
119 | call. */ | |
120 | CORE_ADDR td_create_bp_addr; | |
fb0e1ba7 | 121 | |
d90e17a7 PA |
122 | /* Location of the thread death event breakpoint. */ |
123 | CORE_ADDR td_death_bp_addr; | |
fb0e1ba7 | 124 | |
d90e17a7 | 125 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 126 | |
d90e17a7 | 127 | td_err_e (*td_init_p) (void); |
fb0e1ba7 | 128 | |
d90e17a7 | 129 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
b4acd559 | 130 | td_thragent_t **ta); |
d90e17a7 PA |
131 | td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
132 | td_thrhandle_t *__th); | |
133 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, | |
134 | lwpid_t lwpid, td_thrhandle_t *th); | |
135 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
136 | td_thr_iter_f *callback, void *cbdata_p, | |
137 | td_thr_state_e state, int ti_pri, | |
138 | sigset_t *ti_sigmask_p, | |
139 | unsigned int ti_user_flags); | |
140 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
141 | td_event_e event, td_notify_t *ptr); | |
142 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
143 | td_thr_events_t *event); | |
144 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
145 | td_event_msg_t *msg); | |
146 | ||
147 | td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
148 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
149 | td_thrinfo_t *infop); | |
150 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, | |
151 | int event); | |
152 | ||
153 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
154 | void *map_address, | |
155 | size_t offset, void **address); | |
156 | }; | |
157 | ||
158 | /* List of known processes using thread_db, and the required | |
159 | bookkeeping. */ | |
160 | struct thread_db_info *thread_db_list; | |
161 | ||
162 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
163 | ||
164 | /* Add the current inferior to the list of processes using libpthread. | |
165 | Return a pointer to the newly allocated object that was added to | |
166 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
167 | LIBTHREAD_DB_SO. */ | |
168 | ||
169 | static struct thread_db_info * | |
170 | add_thread_db_info (void *handle) | |
171 | { | |
172 | int pid; | |
173 | struct thread_db_info *info; | |
174 | ||
175 | info = xcalloc (1, sizeof (*info)); | |
176 | info->pid = ptid_get_pid (inferior_ptid); | |
177 | info->handle = handle; | |
4d062f1a | 178 | info->need_stale_parent_threads_check = 1; |
d90e17a7 PA |
179 | |
180 | info->next = thread_db_list; | |
181 | thread_db_list = info; | |
182 | ||
183 | return info; | |
184 | } | |
185 | ||
186 | /* Return the thread_db_info object representing the bookkeeping | |
187 | related to process PID, if any; NULL otherwise. */ | |
188 | ||
189 | static struct thread_db_info * | |
190 | get_thread_db_info (int pid) | |
191 | { | |
192 | struct thread_db_info *info; | |
193 | ||
194 | for (info = thread_db_list; info; info = info->next) | |
195 | if (pid == info->pid) | |
196 | return info; | |
197 | ||
198 | return NULL; | |
199 | } | |
200 | ||
201 | /* When PID has exited or has been detached, we no longer want to keep | |
202 | track of it as using libpthread. Call this function to discard | |
203 | thread_db related info related to PID. Note that this closes | |
204 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
205 | ||
206 | static void | |
207 | delete_thread_db_info (int pid) | |
208 | { | |
209 | struct thread_db_info *info, *info_prev; | |
210 | ||
211 | info_prev = NULL; | |
212 | ||
213 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
214 | if (pid == info->pid) | |
215 | break; | |
216 | ||
217 | if (info == NULL) | |
218 | return; | |
219 | ||
220 | if (info->handle != NULL) | |
221 | dlclose (info->handle); | |
222 | ||
223 | if (info_prev) | |
224 | info_prev->next = info->next; | |
225 | else | |
226 | thread_db_list = info->next; | |
227 | ||
228 | xfree (info); | |
229 | } | |
fb0e1ba7 MK |
230 | |
231 | /* Prototypes for local functions. */ | |
5365276c | 232 | static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 233 | const td_thrinfo_t *ti_p); |
17faa917 | 234 | static void detach_thread (ptid_t ptid); |
fb0e1ba7 MK |
235 | \f |
236 | ||
5365276c DJ |
237 | /* Use "struct private_thread_info" to cache thread state. This is |
238 | a substantial optimization. */ | |
239 | ||
fb0e1ba7 MK |
240 | struct private_thread_info |
241 | { | |
a2f23071 DJ |
242 | /* Flag set when we see a TD_DEATH event for this thread. */ |
243 | unsigned int dying:1; | |
244 | ||
5365276c | 245 | /* Cached thread state. */ |
5365276c | 246 | td_thrhandle_t th; |
17faa917 | 247 | thread_t tid; |
fb0e1ba7 | 248 | }; |
fb0e1ba7 | 249 | \f |
21bf60fe | 250 | |
fb0e1ba7 MK |
251 | static char * |
252 | thread_db_err_str (td_err_e err) | |
253 | { | |
254 | static char buf[64]; | |
255 | ||
256 | switch (err) | |
257 | { | |
258 | case TD_OK: | |
259 | return "generic 'call succeeded'"; | |
260 | case TD_ERR: | |
261 | return "generic error"; | |
262 | case TD_NOTHR: | |
263 | return "no thread to satisfy query"; | |
264 | case TD_NOSV: | |
265 | return "no sync handle to satisfy query"; | |
266 | case TD_NOLWP: | |
267 | return "no LWP to satisfy query"; | |
268 | case TD_BADPH: | |
269 | return "invalid process handle"; | |
270 | case TD_BADTH: | |
271 | return "invalid thread handle"; | |
272 | case TD_BADSH: | |
273 | return "invalid synchronization handle"; | |
274 | case TD_BADTA: | |
275 | return "invalid thread agent"; | |
276 | case TD_BADKEY: | |
277 | return "invalid key"; | |
278 | case TD_NOMSG: | |
279 | return "no event message for getmsg"; | |
280 | case TD_NOFPREGS: | |
281 | return "FPU register set not available"; | |
282 | case TD_NOLIBTHREAD: | |
283 | return "application not linked with libthread"; | |
284 | case TD_NOEVENT: | |
285 | return "requested event is not supported"; | |
286 | case TD_NOCAPAB: | |
287 | return "capability not available"; | |
288 | case TD_DBERR: | |
289 | return "debugger service failed"; | |
290 | case TD_NOAPLIC: | |
291 | return "operation not applicable to"; | |
292 | case TD_NOTSD: | |
293 | return "no thread-specific data for this thread"; | |
294 | case TD_MALLOC: | |
295 | return "malloc failed"; | |
296 | case TD_PARTIALREG: | |
297 | return "only part of register set was written/read"; | |
298 | case TD_NOXREGS: | |
299 | return "X register set not available for this thread"; | |
59f80f10 DJ |
300 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
301 | case TD_NOTALLOC: | |
302 | return "thread has not yet allocated TLS for given module"; | |
303 | #endif | |
304 | #ifdef THREAD_DB_HAS_TD_VERSION | |
305 | case TD_VERSION: | |
306 | return "versions of libpthread and libthread_db do not match"; | |
307 | #endif | |
308 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
309 | case TD_NOTLS: | |
310 | return "there is no TLS segment in the given module"; | |
311 | #endif | |
fb0e1ba7 MK |
312 | default: |
313 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
314 | return buf; | |
315 | } | |
316 | } | |
fb0e1ba7 | 317 | \f |
4105de34 DJ |
318 | /* Return 1 if any threads have been registered. There may be none if |
319 | the threading library is not fully initialized yet. */ | |
320 | ||
321 | static int | |
d90e17a7 | 322 | have_threads_callback (struct thread_info *thread, void *args) |
4105de34 | 323 | { |
d90e17a7 PA |
324 | int pid = * (int *) args; |
325 | if (ptid_get_pid (thread->ptid) != pid) | |
326 | return 0; | |
327 | ||
e3bc4218 | 328 | return thread->private != NULL; |
4105de34 DJ |
329 | } |
330 | ||
331 | static int | |
d90e17a7 | 332 | have_threads (ptid_t ptid) |
4105de34 | 333 | { |
d90e17a7 PA |
334 | int pid = ptid_get_pid (ptid); |
335 | ||
336 | return iterate_over_threads (have_threads_callback, &pid) != NULL; | |
4105de34 DJ |
337 | } |
338 | ||
d90e17a7 PA |
339 | struct thread_get_info_inout |
340 | { | |
341 | struct thread_info *thread_info; | |
342 | struct thread_db_info *thread_db_info; | |
343 | }; | |
344 | ||
5365276c | 345 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 346 | threads to LWPs. |
5365276c DJ |
347 | |
348 | THP is a handle to the current thread; if INFOP is not NULL, the | |
349 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
350 | *INFOP. |
351 | ||
352 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
353 | zero is returned to indicate success. */ | |
5365276c DJ |
354 | |
355 | static int | |
d90e17a7 | 356 | thread_get_info_callback (const td_thrhandle_t *thp, void *argp) |
5365276c DJ |
357 | { |
358 | td_thrinfo_t ti; | |
359 | td_err_e err; | |
5365276c | 360 | ptid_t thread_ptid; |
d90e17a7 PA |
361 | struct thread_get_info_inout *inout; |
362 | struct thread_db_info *info; | |
363 | ||
364 | inout = argp; | |
365 | info = inout->thread_db_info; | |
5365276c | 366 | |
d90e17a7 | 367 | err = info->td_thr_get_info_p (thp, &ti); |
5365276c | 368 | if (err != TD_OK) |
8a3fe4f8 | 369 | error (_("thread_get_info_callback: cannot get thread info: %s"), |
5365276c DJ |
370 | thread_db_err_str (err)); |
371 | ||
372 | /* Fill the cache. */ | |
d90e17a7 | 373 | thread_ptid = ptid_build (info->pid, ti.ti_lid, 0); |
e09875d4 | 374 | inout->thread_info = find_thread_ptid (thread_ptid); |
5365276c | 375 | |
b9b5d7ea | 376 | /* In the case of a zombie thread, don't continue. We don't want to |
f90ef764 | 377 | attach to it thinking it is a new thread. */ |
b9b5d7ea | 378 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
d90e17a7 | 379 | return TD_THR_ZOMBIE; |
b9b5d7ea | 380 | |
d90e17a7 | 381 | if (inout->thread_info == NULL) |
5365276c DJ |
382 | { |
383 | /* New thread. Attach to it now (why wait?). */ | |
d90e17a7 PA |
384 | if (!have_threads (thread_ptid)) |
385 | thread_db_find_new_threads_1 (thread_ptid); | |
4c28f408 PA |
386 | else |
387 | attach_thread (thread_ptid, thp, &ti); | |
e09875d4 | 388 | inout->thread_info = find_thread_ptid (thread_ptid); |
d90e17a7 | 389 | gdb_assert (inout->thread_info != NULL); |
5365276c DJ |
390 | } |
391 | ||
5365276c DJ |
392 | return 0; |
393 | } | |
5365276c | 394 | \f |
fb0e1ba7 MK |
395 | /* Convert between user-level thread ids and LWP ids. */ |
396 | ||
39f77062 KB |
397 | static ptid_t |
398 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 | 399 | { |
fb0e1ba7 MK |
400 | td_thrhandle_t th; |
401 | td_err_e err; | |
5365276c | 402 | ptid_t thread_ptid; |
d90e17a7 PA |
403 | struct thread_db_info *info; |
404 | struct thread_get_info_inout io = {0}; | |
fb0e1ba7 | 405 | |
17faa917 DJ |
406 | /* This ptid comes from linux-nat.c, which should always fill in the |
407 | LWP. */ | |
408 | gdb_assert (GET_LWP (ptid) != 0); | |
fb0e1ba7 | 409 | |
d90e17a7 PA |
410 | info = get_thread_db_info (GET_PID (ptid)); |
411 | ||
4c28f408 | 412 | /* Access an lwp we know is stopped. */ |
d90e17a7 PA |
413 | info->proc_handle.ptid = ptid; |
414 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); | |
fb0e1ba7 | 415 | if (err != TD_OK) |
8a3fe4f8 | 416 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
39f77062 | 417 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 418 | |
b9b5d7ea JJ |
419 | /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the |
420 | event thread has already died. If another gdb interface has called | |
421 | thread_alive() previously, the thread won't be found on the thread list | |
422 | anymore. In that case, we don't want to process this ptid anymore | |
423 | to avoid the possibility of later treating it as a newly | |
424 | discovered thread id that we should add to the list. Thus, | |
425 | we return a -1 ptid which is also how the thread list marks a | |
426 | dead thread. */ | |
d90e17a7 PA |
427 | io.thread_db_info = info; |
428 | io.thread_info = NULL; | |
429 | if (thread_get_info_callback (&th, &io) == TD_THR_ZOMBIE | |
430 | && io.thread_info == NULL) | |
431 | return minus_one_ptid; | |
b9b5d7ea | 432 | |
17faa917 DJ |
433 | gdb_assert (ptid_get_tid (ptid) == 0); |
434 | return ptid; | |
fb0e1ba7 MK |
435 | } |
436 | \f | |
437 | ||
4c28f408 PA |
438 | /* Attach to lwp PTID, doing whatever else is required to have this |
439 | LWP under the debugger's control --- e.g., enabling event | |
440 | reporting. Returns true on success. */ | |
441 | int | |
442 | thread_db_attach_lwp (ptid_t ptid) | |
443 | { | |
444 | td_thrhandle_t th; | |
445 | td_thrinfo_t ti; | |
446 | td_err_e err; | |
d90e17a7 | 447 | struct thread_db_info *info; |
4c28f408 | 448 | |
d90e17a7 PA |
449 | info = get_thread_db_info (GET_PID (ptid)); |
450 | ||
451 | if (info == NULL) | |
4c28f408 PA |
452 | return 0; |
453 | ||
454 | /* This ptid comes from linux-nat.c, which should always fill in the | |
455 | LWP. */ | |
456 | gdb_assert (GET_LWP (ptid) != 0); | |
457 | ||
458 | /* Access an lwp we know is stopped. */ | |
d90e17a7 | 459 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
460 | |
461 | /* If we have only looked at the first thread before libpthread was | |
462 | initialized, we may not know its thread ID yet. Make sure we do | |
463 | before we add another thread to the list. */ | |
d90e17a7 PA |
464 | if (!have_threads (ptid)) |
465 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 466 | |
d90e17a7 | 467 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); |
4c28f408 PA |
468 | if (err != TD_OK) |
469 | /* Cannot find user-level thread. */ | |
470 | return 0; | |
471 | ||
d90e17a7 | 472 | err = info->td_thr_get_info_p (&th, &ti); |
4c28f408 PA |
473 | if (err != TD_OK) |
474 | { | |
475 | warning (_("Cannot get thread info: %s"), thread_db_err_str (err)); | |
476 | return 0; | |
477 | } | |
478 | ||
479 | attach_thread (ptid, &th, &ti); | |
480 | return 1; | |
481 | } | |
482 | ||
5220ea4c AC |
483 | static void * |
484 | verbose_dlsym (void *handle, const char *name) | |
485 | { | |
486 | void *sym = dlsym (handle, name); | |
487 | if (sym == NULL) | |
8a3fe4f8 | 488 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), name, dlerror ()); |
5220ea4c AC |
489 | return sym; |
490 | } | |
491 | ||
cdbc0b18 | 492 | static td_err_e |
d90e17a7 | 493 | enable_thread_event (int event, CORE_ADDR *bp) |
24557e30 AC |
494 | { |
495 | td_notify_t notify; | |
cdbc0b18 | 496 | td_err_e err; |
d90e17a7 PA |
497 | struct thread_db_info *info; |
498 | ||
499 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
24557e30 | 500 | |
4c28f408 | 501 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 502 | info->proc_handle.ptid = inferior_ptid; |
4c28f408 | 503 | |
24557e30 | 504 | /* Get the breakpoint address for thread EVENT. */ |
d90e17a7 | 505 | err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify); |
24557e30 | 506 | if (err != TD_OK) |
cdbc0b18 | 507 | return err; |
24557e30 AC |
508 | |
509 | /* Set up the breakpoint. */ | |
16451949 AS |
510 | gdb_assert (exec_bfd); |
511 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
a97b0ac8 | 512 | (target_gdbarch, |
16451949 AS |
513 | /* Do proper sign extension for the target. */ |
514 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
515 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
516 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
517 | ¤t_target)); | |
a6d9a66e | 518 | create_thread_event_breakpoint (target_gdbarch, *bp); |
24557e30 | 519 | |
cdbc0b18 | 520 | return TD_OK; |
24557e30 AC |
521 | } |
522 | ||
fb0e1ba7 MK |
523 | static void |
524 | enable_thread_event_reporting (void) | |
525 | { | |
526 | td_thr_events_t events; | |
527 | td_notify_t notify; | |
528 | td_err_e err; | |
a2f23071 DJ |
529 | #ifdef HAVE_GNU_LIBC_VERSION_H |
530 | const char *libc_version; | |
531 | int libc_major, libc_minor; | |
532 | #endif | |
d90e17a7 PA |
533 | struct thread_db_info *info; |
534 | ||
535 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
fb0e1ba7 MK |
536 | |
537 | /* We cannot use the thread event reporting facility if these | |
538 | functions aren't available. */ | |
d90e17a7 PA |
539 | if (info->td_ta_event_addr_p == NULL |
540 | || info->td_ta_set_event_p == NULL | |
541 | || info->td_ta_event_getmsg_p == NULL | |
542 | || info->td_thr_event_enable_p == NULL) | |
fb0e1ba7 MK |
543 | return; |
544 | ||
545 | /* Set the process wide mask saying which events we're interested in. */ | |
546 | td_event_emptyset (&events); | |
547 | td_event_addset (&events, TD_CREATE); | |
a2f23071 DJ |
548 | |
549 | #ifdef HAVE_GNU_LIBC_VERSION_H | |
34091d9b | 550 | /* The event reporting facility is broken for TD_DEATH events in |
2ef52e77 | 551 | glibc 2.1.3, so don't enable it if we have glibc but a lower |
34091d9b | 552 | version. */ |
a2f23071 DJ |
553 | libc_version = gnu_get_libc_version (); |
554 | if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 | |
555 | && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) | |
fb0e1ba7 | 556 | #endif |
a2f23071 | 557 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 | 558 | |
d90e17a7 | 559 | err = info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
560 | if (err != TD_OK) |
561 | { | |
8a3fe4f8 | 562 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
563 | thread_db_err_str (err)); |
564 | return; | |
565 | } | |
566 | ||
567 | /* Delete previous thread event breakpoints, if any. */ | |
568 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
569 | info->td_create_bp_addr = 0; |
570 | info->td_death_bp_addr = 0; | |
fb0e1ba7 | 571 | |
24557e30 | 572 | /* Set up the thread creation event. */ |
d90e17a7 | 573 | err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr); |
cdbc0b18 | 574 | if (err != TD_OK) |
fb0e1ba7 | 575 | { |
8a3fe4f8 | 576 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
577 | thread_db_err_str (err)); |
578 | return; | |
579 | } | |
580 | ||
24557e30 | 581 | /* Set up the thread death event. */ |
d90e17a7 | 582 | err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr); |
cdbc0b18 | 583 | if (err != TD_OK) |
fb0e1ba7 | 584 | { |
8a3fe4f8 | 585 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
586 | thread_db_err_str (err)); |
587 | return; | |
588 | } | |
fb0e1ba7 MK |
589 | } |
590 | ||
456b0e24 PP |
591 | /* Same as thread_db_find_new_threads_1, but silently ignore errors. */ |
592 | ||
593 | static void | |
594 | thread_db_find_new_threads_silently (ptid_t ptid) | |
595 | { | |
596 | volatile struct gdb_exception except; | |
597 | ||
598 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
599 | { | |
600 | thread_db_find_new_threads_1 (ptid); | |
601 | } | |
602 | ||
603 | if (except.reason < 0 && info_verbose) | |
604 | { | |
605 | exception_fprintf (gdb_stderr, except, | |
606 | "Warning: thread_db_find_new_threads_silently: "); | |
607 | } | |
608 | } | |
609 | ||
d90e17a7 PA |
610 | /* Lookup a library in which given symbol resides. |
611 | Note: this is looking in GDB process, not in the inferior. | |
612 | Returns library name, or NULL. */ | |
613 | ||
614 | static const char * | |
615 | dladdr_to_soname (const void *addr) | |
616 | { | |
617 | Dl_info info; | |
618 | ||
619 | if (dladdr (addr, &info) != 0) | |
620 | return info.dli_fname; | |
621 | return NULL; | |
622 | } | |
623 | ||
17a37d48 PP |
624 | /* Attempt to initialize dlopen()ed libthread_db, described by HANDLE. |
625 | Return 1 on success. | |
626 | Failure could happen if libthread_db does not have symbols we expect, | |
627 | or when it refuses to work with the current inferior (e.g. due to | |
628 | version mismatch between libthread_db and libpthread). */ | |
629 | ||
630 | static int | |
d90e17a7 | 631 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
632 | { |
633 | td_err_e err; | |
634 | ||
635 | /* Initialize pointers to the dynamic library functions we will use. | |
636 | Essential functions first. */ | |
637 | ||
d90e17a7 PA |
638 | info->td_init_p = verbose_dlsym (info->handle, "td_init"); |
639 | if (info->td_init_p == NULL) | |
17a37d48 PP |
640 | return 0; |
641 | ||
d90e17a7 | 642 | err = info->td_init_p (); |
17a37d48 PP |
643 | if (err != TD_OK) |
644 | { | |
645 | warning (_("Cannot initialize libthread_db: %s"), thread_db_err_str (err)); | |
646 | return 0; | |
647 | } | |
648 | ||
d90e17a7 PA |
649 | info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new"); |
650 | if (info->td_ta_new_p == NULL) | |
17a37d48 PP |
651 | return 0; |
652 | ||
653 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 654 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
655 | |
656 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 657 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
658 | if (err != TD_OK) |
659 | { | |
17a37d48 PP |
660 | if (info_verbose) |
661 | printf_unfiltered (_("td_ta_new failed: %s\n"), | |
662 | thread_db_err_str (err)); | |
663 | else | |
664 | switch (err) | |
665 | { | |
666 | case TD_NOLIBTHREAD: | |
667 | #ifdef THREAD_DB_HAS_TD_VERSION | |
668 | case TD_VERSION: | |
669 | #endif | |
670 | /* The errors above are not unexpected and silently ignored: | |
671 | they just mean we haven't found correct version of | |
672 | libthread_db yet. */ | |
673 | break; | |
674 | default: | |
675 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
676 | } | |
677 | return 0; | |
678 | } | |
679 | ||
d90e17a7 PA |
680 | info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr"); |
681 | if (info->td_ta_map_id2thr_p == NULL) | |
17a37d48 PP |
682 | return 0; |
683 | ||
d90e17a7 PA |
684 | info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, "td_ta_map_lwp2thr"); |
685 | if (info->td_ta_map_lwp2thr_p == NULL) | |
17a37d48 PP |
686 | return 0; |
687 | ||
d90e17a7 PA |
688 | info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter"); |
689 | if (info->td_ta_thr_iter_p == NULL) | |
17a37d48 PP |
690 | return 0; |
691 | ||
d90e17a7 PA |
692 | info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate"); |
693 | if (info->td_thr_validate_p == NULL) | |
17a37d48 PP |
694 | return 0; |
695 | ||
d90e17a7 PA |
696 | info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info"); |
697 | if (info->td_thr_get_info_p == NULL) | |
17a37d48 PP |
698 | return 0; |
699 | ||
700 | /* These are not essential. */ | |
d90e17a7 PA |
701 | info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr"); |
702 | info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event"); | |
703 | info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); | |
704 | info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); | |
705 | info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); | |
17a37d48 PP |
706 | |
707 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); | |
708 | ||
d90e17a7 PA |
709 | if (info_verbose || *libthread_db_search_path) |
710 | { | |
711 | const char *library; | |
17a37d48 | 712 | |
d90e17a7 PA |
713 | library = dladdr_to_soname (*info->td_ta_new_p); |
714 | if (library == NULL) | |
715 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 716 | |
d90e17a7 PA |
717 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
718 | library); | |
719 | } | |
17a37d48 | 720 | |
d90e17a7 PA |
721 | /* The thread library was detected. Activate the thread_db target |
722 | if this is the first process using it. */ | |
723 | if (thread_db_list->next == NULL) | |
724 | push_target (&thread_db_ops); | |
17a37d48 | 725 | |
d90e17a7 | 726 | enable_thread_event_reporting (); |
456b0e24 | 727 | |
099cb4fb | 728 | /* There appears to be a bug in glibc-2.3.6: calls to td_thr_get_info fail |
456b0e24 PP |
729 | with TD_ERR for statically linked executables if td_thr_get_info is |
730 | called before glibc has initialized itself. Silently ignore such | |
099cb4fb | 731 | errors, and let gdb enumerate threads again later. */ |
456b0e24 | 732 | thread_db_find_new_threads_silently (inferior_ptid); |
099cb4fb | 733 | |
d90e17a7 | 734 | return 1; |
17a37d48 PP |
735 | } |
736 | ||
737 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
738 | relative, or just LIBTHREAD_DB. */ | |
739 | ||
740 | static int | |
741 | try_thread_db_load (const char *library) | |
742 | { | |
743 | void *handle; | |
d90e17a7 | 744 | struct thread_db_info *info; |
17a37d48 PP |
745 | |
746 | if (info_verbose) | |
747 | printf_unfiltered (_("Trying host libthread_db library: %s.\n"), | |
748 | library); | |
749 | handle = dlopen (library, RTLD_NOW); | |
750 | if (handle == NULL) | |
751 | { | |
752 | if (info_verbose) | |
753 | printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ()); | |
754 | return 0; | |
755 | } | |
756 | ||
757 | if (info_verbose && strchr (library, '/') == NULL) | |
758 | { | |
759 | void *td_init; | |
760 | ||
761 | td_init = dlsym (handle, "td_init"); | |
762 | if (td_init != NULL) | |
763 | { | |
764 | const char *const libpath = dladdr_to_soname (td_init); | |
765 | ||
766 | if (libpath != NULL) | |
767 | printf_unfiltered (_("Host %s resolved to: %s.\n"), | |
768 | library, libpath); | |
769 | } | |
770 | } | |
771 | ||
d90e17a7 PA |
772 | info = add_thread_db_info (handle); |
773 | ||
774 | if (try_thread_db_load_1 (info)) | |
17a37d48 PP |
775 | return 1; |
776 | ||
777 | /* This library "refused" to work on current inferior. */ | |
d90e17a7 | 778 | delete_thread_db_info (GET_PID (inferior_ptid)); |
17a37d48 PP |
779 | return 0; |
780 | } | |
781 | ||
782 | ||
783 | /* Search libthread_db_search_path for libthread_db which "agrees" | |
784 | to work on current inferior. */ | |
785 | ||
786 | static int | |
787 | thread_db_load_search (void) | |
788 | { | |
789 | char path[PATH_MAX]; | |
790 | const char *search_path = libthread_db_search_path; | |
791 | int rc = 0; | |
792 | ||
793 | while (*search_path) | |
794 | { | |
795 | const char *end = strchr (search_path, ':'); | |
796 | if (end) | |
797 | { | |
798 | size_t len = end - search_path; | |
799 | if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
800 | { | |
801 | char *cp = xmalloc (len + 1); | |
802 | memcpy (cp, search_path, len); | |
803 | cp[len] = '\0'; | |
804 | warning (_("libthread_db_search_path component too long," | |
805 | " ignored: %s."), cp); | |
806 | xfree (cp); | |
807 | search_path += len + 1; | |
808 | continue; | |
809 | } | |
810 | memcpy (path, search_path, len); | |
811 | path[len] = '\0'; | |
812 | search_path += len + 1; | |
813 | } | |
814 | else | |
815 | { | |
816 | size_t len = strlen (search_path); | |
817 | ||
818 | if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
819 | { | |
820 | warning (_("libthread_db_search_path component too long," | |
821 | " ignored: %s."), search_path); | |
822 | break; | |
823 | } | |
824 | memcpy (path, search_path, len + 1); | |
825 | search_path += len; | |
826 | } | |
827 | strcat (path, "/"); | |
828 | strcat (path, LIBTHREAD_DB_SO); | |
829 | if (try_thread_db_load (path)) | |
830 | { | |
831 | rc = 1; | |
832 | break; | |
833 | } | |
834 | } | |
835 | if (rc == 0) | |
836 | rc = try_thread_db_load (LIBTHREAD_DB_SO); | |
837 | return rc; | |
838 | } | |
839 | ||
840 | /* Attempt to load and initialize libthread_db. | |
841 | Return 1 on success. | |
842 | */ | |
843 | ||
844 | static int | |
845 | thread_db_load (void) | |
846 | { | |
847 | struct objfile *obj; | |
d90e17a7 | 848 | struct thread_db_info *info; |
17a37d48 | 849 | |
d90e17a7 PA |
850 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
851 | ||
852 | if (info != NULL) | |
17a37d48 PP |
853 | return 1; |
854 | ||
855 | /* Don't attempt to use thread_db on targets which can not run | |
856 | (executables not running yet, core files) for now. */ | |
857 | if (!target_has_execution) | |
858 | return 0; | |
859 | ||
860 | /* Don't attempt to use thread_db for remote targets. */ | |
861 | if (!target_can_run (¤t_target)) | |
862 | return 0; | |
863 | ||
864 | if (thread_db_load_search ()) | |
865 | return 1; | |
866 | ||
867 | /* None of the libthread_db's on our search path, not the system default | |
868 | ones worked. If the executable is dynamically linked against | |
869 | libpthread, try loading libthread_db from the same directory. */ | |
870 | ||
871 | ALL_OBJFILES (obj) | |
872 | if (libpthread_name_p (obj->name)) | |
873 | { | |
874 | char path[PATH_MAX], *cp; | |
875 | ||
876 | gdb_assert (strlen (obj->name) < sizeof (path)); | |
877 | strcpy (path, obj->name); | |
878 | cp = strrchr (path, '/'); | |
879 | ||
880 | if (cp == NULL) | |
881 | { | |
882 | warning (_("Expected absolute pathname for libpthread in the" | |
883 | " inferior, but got %s."), path); | |
884 | } | |
885 | else if (cp + 1 + strlen (LIBTHREAD_DB_SO) + 1 > path + sizeof (path)) | |
886 | { | |
887 | warning (_("Unexpected: path to libpthread in the inferior is" | |
888 | " too long: %s"), path); | |
889 | } | |
890 | else | |
891 | { | |
892 | strcpy (cp + 1, LIBTHREAD_DB_SO); | |
893 | if (try_thread_db_load (path)) | |
894 | return 1; | |
895 | } | |
896 | warning (_("Unable to find libthread_db matching inferior's thread" | |
897 | " library, thread debugging will not be available.")); | |
898 | return 0; | |
899 | } | |
900 | /* Either this executable isn't using libpthread at all, or it is | |
901 | statically linked. Since we can't easily distinguish these two cases, | |
902 | no warning is issued. */ | |
903 | return 0; | |
904 | } | |
905 | ||
fb0e1ba7 MK |
906 | static void |
907 | disable_thread_event_reporting (void) | |
908 | { | |
909 | td_thr_events_t events; | |
d90e17a7 PA |
910 | struct thread_db_info *info; |
911 | ||
912 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
fb0e1ba7 MK |
913 | |
914 | /* Set the process wide mask saying we aren't interested in any | |
915 | events anymore. */ | |
916 | td_event_emptyset (&events); | |
d90e17a7 | 917 | info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
918 | |
919 | /* Delete thread event breakpoints, if any. */ | |
920 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
921 | info->td_create_bp_addr = 0; |
922 | info->td_death_bp_addr = 0; | |
fb0e1ba7 MK |
923 | } |
924 | ||
925 | static void | |
926 | check_thread_signals (void) | |
927 | { | |
928 | #ifdef GET_THREAD_SIGNALS | |
21bf60fe | 929 | if (!thread_signals) |
fb0e1ba7 MK |
930 | { |
931 | sigset_t mask; | |
932 | int i; | |
933 | ||
934 | GET_THREAD_SIGNALS (&mask); | |
935 | sigemptyset (&thread_stop_set); | |
936 | sigemptyset (&thread_print_set); | |
937 | ||
b9569773 | 938 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
939 | { |
940 | if (sigismember (&mask, i)) | |
941 | { | |
942 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
943 | sigaddset (&thread_stop_set, i); | |
944 | if (signal_print_update (target_signal_from_host (i), 0)) | |
945 | sigaddset (&thread_print_set, i); | |
946 | thread_signals = 1; | |
947 | } | |
948 | } | |
949 | } | |
950 | #endif | |
951 | } | |
952 | ||
0ec9a092 DJ |
953 | /* Check whether thread_db is usable. This function is called when |
954 | an inferior is created (or otherwise acquired, e.g. attached to) | |
955 | and when new shared libraries are loaded into a running process. */ | |
956 | ||
957 | void | |
958 | check_for_thread_db (void) | |
fb0e1ba7 MK |
959 | { |
960 | td_err_e err; | |
17a37d48 | 961 | static void *last_loaded; |
fb0e1ba7 | 962 | |
b5057acd | 963 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 964 | if (!thread_db_load ()) |
b5057acd | 965 | return; |
0ec9a092 DJ |
966 | } |
967 | ||
968 | static void | |
969 | thread_db_new_objfile (struct objfile *objfile) | |
970 | { | |
d90e17a7 PA |
971 | /* This observer must always be called with inferior_ptid set |
972 | correctly. */ | |
973 | ||
0ec9a092 DJ |
974 | if (objfile != NULL) |
975 | check_for_thread_db (); | |
fb0e1ba7 MK |
976 | } |
977 | ||
a2f23071 DJ |
978 | /* Attach to a new thread. This function is called when we receive a |
979 | TD_CREATE event or when we iterate over all threads and find one | |
980 | that wasn't already in our list. */ | |
981 | ||
fb0e1ba7 | 982 | static void |
39f77062 | 983 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 984 | const td_thrinfo_t *ti_p) |
fb0e1ba7 | 985 | { |
17faa917 DJ |
986 | struct private_thread_info *private; |
987 | struct thread_info *tp = NULL; | |
fb0e1ba7 | 988 | td_err_e err; |
d90e17a7 | 989 | struct thread_db_info *info; |
fb0e1ba7 | 990 | |
a2f23071 DJ |
991 | /* If we're being called after a TD_CREATE event, we may already |
992 | know about this thread. There are two ways this can happen. We | |
993 | may have iterated over all threads between the thread creation | |
994 | and the TD_CREATE event, for instance when the user has issued | |
995 | the `info threads' command before the SIGTRAP for hitting the | |
996 | thread creation breakpoint was reported. Alternatively, the | |
997 | thread may have exited and a new one been created with the same | |
998 | thread ID. In the first case we don't need to do anything; in | |
999 | the second case we should discard information about the dead | |
1000 | thread and attach to the new one. */ | |
1001 | if (in_thread_list (ptid)) | |
1002 | { | |
e09875d4 | 1003 | tp = find_thread_ptid (ptid); |
a2f23071 DJ |
1004 | gdb_assert (tp != NULL); |
1005 | ||
17faa917 DJ |
1006 | /* If tp->private is NULL, then GDB is already attached to this |
1007 | thread, but we do not know anything about it. We can learn | |
1008 | about it here. This can only happen if we have some other | |
1009 | way besides libthread_db to notice new threads (i.e. | |
1010 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread | |
1011 | exit, so this can not be a stale thread recreated with the | |
1012 | same ID. */ | |
1013 | if (tp->private != NULL) | |
1014 | { | |
1015 | if (!tp->private->dying) | |
1016 | return; | |
a2f23071 | 1017 | |
17faa917 DJ |
1018 | delete_thread (ptid); |
1019 | tp = NULL; | |
1020 | } | |
a2f23071 DJ |
1021 | } |
1022 | ||
fb0e1ba7 MK |
1023 | check_thread_signals (); |
1024 | ||
9ee57c33 DJ |
1025 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
1026 | return; /* A zombie thread -- do not attach. */ | |
1027 | ||
1028 | /* Under GNU/Linux, we have to attach to each and every thread. */ | |
17faa917 DJ |
1029 | if (tp == NULL |
1030 | && lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid))) < 0) | |
9ee57c33 DJ |
1031 | return; |
1032 | ||
17faa917 DJ |
1033 | /* Construct the thread's private data. */ |
1034 | private = xmalloc (sizeof (struct private_thread_info)); | |
1035 | memset (private, 0, sizeof (struct private_thread_info)); | |
1036 | ||
1037 | /* A thread ID of zero may mean the thread library has not initialized | |
1038 | yet. But we shouldn't even get here if that's the case. FIXME: | |
1039 | if we change GDB to always have at least one thread in the thread | |
1040 | list this will have to go somewhere else; maybe private == NULL | |
1041 | until the thread_db target claims it. */ | |
1042 | gdb_assert (ti_p->ti_tid != 0); | |
1043 | private->th = *th_p; | |
1044 | private->tid = ti_p->ti_tid; | |
1045 | ||
fb0e1ba7 | 1046 | /* Add the thread to GDB's thread list. */ |
17faa917 DJ |
1047 | if (tp == NULL) |
1048 | tp = add_thread_with_info (ptid, private); | |
1049 | else | |
1050 | tp->private = private; | |
5365276c | 1051 | |
d90e17a7 PA |
1052 | info = get_thread_db_info (GET_PID (ptid)); |
1053 | ||
fb0e1ba7 | 1054 | /* Enable thread event reporting for this thread. */ |
d90e17a7 | 1055 | err = info->td_thr_event_enable_p (th_p, 1); |
fb0e1ba7 | 1056 | if (err != TD_OK) |
8a3fe4f8 | 1057 | error (_("Cannot enable thread event reporting for %s: %s"), |
39f77062 | 1058 | target_pid_to_str (ptid), thread_db_err_str (err)); |
fb0e1ba7 MK |
1059 | } |
1060 | ||
1061 | static void | |
17faa917 | 1062 | detach_thread (ptid_t ptid) |
fb0e1ba7 | 1063 | { |
a2f23071 DJ |
1064 | struct thread_info *thread_info; |
1065 | ||
a2f23071 DJ |
1066 | /* Don't delete the thread now, because it still reports as active |
1067 | until it has executed a few instructions after the event | |
1068 | breakpoint - if we deleted it now, "info threads" would cause us | |
1069 | to re-attach to it. Just mark it as having had a TD_DEATH | |
1070 | event. This means that we won't delete it from our thread list | |
1071 | until we notice that it's dead (via prune_threads), or until | |
17faa917 DJ |
1072 | something re-uses its thread ID. We'll report the thread exit |
1073 | when the underlying LWP dies. */ | |
e09875d4 | 1074 | thread_info = find_thread_ptid (ptid); |
17faa917 | 1075 | gdb_assert (thread_info != NULL && thread_info->private != NULL); |
a2f23071 | 1076 | thread_info->private->dying = 1; |
fb0e1ba7 MK |
1077 | } |
1078 | ||
1079 | static void | |
136d6dae | 1080 | thread_db_detach (struct target_ops *ops, char *args, int from_tty) |
fb0e1ba7 | 1081 | { |
117de6a9 | 1082 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1083 | struct thread_db_info *info; |
117de6a9 | 1084 | |
d90e17a7 | 1085 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
c194fbe1 | 1086 | |
d90e17a7 PA |
1087 | if (info) |
1088 | { | |
1089 | disable_thread_event_reporting (); | |
7a7d3353 | 1090 | |
d90e17a7 PA |
1091 | /* Delete the old thread event breakpoints. Note that unlike |
1092 | when mourning, we can remove them here because there's still | |
1093 | a live inferior to poke at. In any case, GDB will not try to | |
1094 | insert anything in the inferior when removing a | |
1095 | breakpoint. */ | |
1096 | remove_thread_event_breakpoints (); | |
1097 | ||
1098 | delete_thread_db_info (GET_PID (inferior_ptid)); | |
1099 | } | |
4105de34 | 1100 | |
7a7d3353 | 1101 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1102 | |
1103 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1104 | ||
1105 | /* If there are no more processes using libpthread, detach the | |
1106 | thread_db target ops. */ | |
1107 | if (!thread_db_list) | |
1108 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1109 | } |
1110 | ||
fb0e1ba7 MK |
1111 | /* Check if PID is currently stopped at the location of a thread event |
1112 | breakpoint location. If it is, read the event message and act upon | |
1113 | the event. */ | |
1114 | ||
1115 | static void | |
39f77062 | 1116 | check_event (ptid_t ptid) |
fb0e1ba7 | 1117 | { |
515630c5 UW |
1118 | struct regcache *regcache = get_thread_regcache (ptid); |
1119 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
fb0e1ba7 MK |
1120 | td_event_msg_t msg; |
1121 | td_thrinfo_t ti; | |
1122 | td_err_e err; | |
1123 | CORE_ADDR stop_pc; | |
4d9850d3 | 1124 | int loop = 0; |
d90e17a7 PA |
1125 | struct thread_db_info *info; |
1126 | ||
1127 | info = get_thread_db_info (GET_PID (ptid)); | |
fb0e1ba7 MK |
1128 | |
1129 | /* Bail out early if we're not at a thread event breakpoint. */ | |
515630c5 UW |
1130 | stop_pc = regcache_read_pc (regcache) |
1131 | - gdbarch_decr_pc_after_break (gdbarch); | |
d90e17a7 PA |
1132 | if (stop_pc != info->td_create_bp_addr |
1133 | && stop_pc != info->td_death_bp_addr) | |
fb0e1ba7 MK |
1134 | return; |
1135 | ||
4c28f408 | 1136 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1137 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
1138 | |
1139 | /* If we have only looked at the first thread before libpthread was | |
1140 | initialized, we may not know its thread ID yet. Make sure we do | |
1141 | before we add another thread to the list. */ | |
d90e17a7 PA |
1142 | if (!have_threads (ptid)) |
1143 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 1144 | |
4d9850d3 JJ |
1145 | /* If we are at a create breakpoint, we do not know what new lwp |
1146 | was created and cannot specifically locate the event message for it. | |
1147 | We have to call td_ta_event_getmsg() to get | |
1148 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 1149 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 1150 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
1151 | This guarantees we will process the correct message before continuing |
1152 | from the breakpoint. | |
4d9850d3 JJ |
1153 | |
1154 | Currently, death events are not enabled. If they are enabled, | |
1155 | the death event can use the td_thr_event_getmsg() interface to | |
1156 | get the message specifically for that lwp and avoid looping | |
1157 | below. */ | |
1158 | ||
1159 | loop = 1; | |
1160 | ||
1161 | do | |
fb0e1ba7 | 1162 | { |
d90e17a7 | 1163 | err = info->td_ta_event_getmsg_p (info->thread_agent, &msg); |
4d9850d3 JJ |
1164 | if (err != TD_OK) |
1165 | { | |
1166 | if (err == TD_NOMSG) | |
1167 | return; | |
fb0e1ba7 | 1168 | |
8a3fe4f8 | 1169 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
1170 | thread_db_err_str (err)); |
1171 | } | |
fb0e1ba7 | 1172 | |
d90e17a7 | 1173 | err = info->td_thr_get_info_p (msg.th_p, &ti); |
4d9850d3 | 1174 | if (err != TD_OK) |
8a3fe4f8 | 1175 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 1176 | |
17faa917 | 1177 | ptid = ptid_build (GET_PID (ptid), ti.ti_lid, 0); |
fb0e1ba7 | 1178 | |
4d9850d3 JJ |
1179 | switch (msg.event) |
1180 | { | |
1181 | case TD_CREATE: | |
a2f23071 DJ |
1182 | /* Call attach_thread whether or not we already know about a |
1183 | thread with this thread ID. */ | |
93815fbf | 1184 | attach_thread (ptid, msg.th_p, &ti); |
fb0e1ba7 | 1185 | |
4d9850d3 | 1186 | break; |
fb0e1ba7 | 1187 | |
4d9850d3 | 1188 | case TD_DEATH: |
fb0e1ba7 | 1189 | |
4d9850d3 | 1190 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 1191 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 1192 | |
17faa917 | 1193 | detach_thread (ptid); |
fb0e1ba7 | 1194 | |
4d9850d3 | 1195 | break; |
fb0e1ba7 | 1196 | |
4d9850d3 | 1197 | default: |
8a3fe4f8 | 1198 | error (_("Spurious thread event.")); |
4d9850d3 | 1199 | } |
fb0e1ba7 | 1200 | } |
4d9850d3 | 1201 | while (loop); |
fb0e1ba7 MK |
1202 | } |
1203 | ||
39f77062 | 1204 | static ptid_t |
117de6a9 | 1205 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1206 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1207 | int options) | |
fb0e1ba7 | 1208 | { |
d90e17a7 | 1209 | struct thread_db_info *info; |
117de6a9 PA |
1210 | struct target_ops *beneath = find_target_beneath (ops); |
1211 | ||
47608cb1 | 1212 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1213 | |
b84876c2 PA |
1214 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1215 | return ptid; | |
1216 | ||
1111f4aa | 1217 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1218 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1219 | return ptid; | |
fb0e1ba7 | 1220 | |
d90e17a7 PA |
1221 | info = get_thread_db_info (GET_PID (ptid)); |
1222 | ||
1223 | /* If this process isn't using thread_db, we're done. */ | |
1224 | if (info == NULL) | |
1225 | return ptid; | |
1226 | ||
3f64f7b1 DJ |
1227 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1228 | { | |
d90e17a7 PA |
1229 | /* Breakpoints have already been marked non-inserted by the |
1230 | layer below. We're safe in knowing that removing them will | |
1231 | not write the shadows of the old image into the new | |
1232 | image. */ | |
3f64f7b1 | 1233 | remove_thread_event_breakpoints (); |
d90e17a7 PA |
1234 | |
1235 | /* New image, it may or may not end up using thread_db. Assume | |
1236 | not unless we find otherwise. */ | |
1237 | delete_thread_db_info (GET_PID (ptid)); | |
1238 | if (!thread_db_list) | |
1239 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1240 | |
49fd4a42 | 1241 | return ptid; |
3f64f7b1 DJ |
1242 | } |
1243 | ||
4105de34 DJ |
1244 | /* If we do not know about the main thread yet, this would be a good time to |
1245 | find it. */ | |
d90e17a7 PA |
1246 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid)) |
1247 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1248 | |
fb0e1ba7 MK |
1249 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
1250 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
1251 | /* Check for a thread event. */ | |
39f77062 | 1252 | check_event (ptid); |
fb0e1ba7 | 1253 | |
d90e17a7 | 1254 | if (have_threads (ptid)) |
4105de34 DJ |
1255 | { |
1256 | /* Change ptids back into the higher level PID + TID format. If | |
1257 | the thread is dead and no longer on the thread list, we will | |
1258 | get back a dead ptid. This can occur if the thread death | |
1259 | event gets postponed by other simultaneous events. In such a | |
1260 | case, we want to just ignore the event and continue on. */ | |
1261 | ||
4105de34 DJ |
1262 | ptid = thread_from_lwp (ptid); |
1263 | if (GET_PID (ptid) == -1) | |
1264 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
1265 | } | |
fb0e1ba7 | 1266 | |
b9b5d7ea | 1267 | return ptid; |
fb0e1ba7 MK |
1268 | } |
1269 | ||
fb0e1ba7 | 1270 | static void |
136d6dae | 1271 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1272 | { |
117de6a9 PA |
1273 | struct target_ops *target_beneath = find_target_beneath (ops); |
1274 | ||
d90e17a7 | 1275 | delete_thread_db_info (GET_PID (inferior_ptid)); |
fb0e1ba7 | 1276 | |
d90e17a7 PA |
1277 | /* Delete the old thread event breakpoints. Mark breakpoints out, |
1278 | so that we don't try to un-insert them. */ | |
1279 | mark_breakpoints_out (); | |
e23fc6de DJ |
1280 | remove_thread_event_breakpoints (); |
1281 | ||
d90e17a7 PA |
1282 | target_beneath->to_mourn_inferior (target_beneath); |
1283 | ||
b26a6851 | 1284 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1285 | if (!thread_db_list) |
1286 | unpush_target (ops); | |
fb0e1ba7 MK |
1287 | } |
1288 | ||
fb0e1ba7 MK |
1289 | static int |
1290 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1291 | { | |
1292 | td_thrinfo_t ti; | |
1293 | td_err_e err; | |
39f77062 | 1294 | ptid_t ptid; |
403fe197 | 1295 | struct thread_info *tp; |
d90e17a7 | 1296 | struct thread_db_info *info = data; |
fb0e1ba7 | 1297 | |
d90e17a7 | 1298 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1299 | if (err != TD_OK) |
8a3fe4f8 | 1300 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1301 | thread_db_err_str (err)); |
fb0e1ba7 | 1302 | |
21bf60fe MK |
1303 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
1304 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 1305 | |
4105de34 DJ |
1306 | if (ti.ti_tid == 0) |
1307 | { | |
1308 | /* A thread ID of zero means that this is the main thread, but | |
1309 | glibc has not yet initialized thread-local storage and the | |
1310 | pthread library. We do not know what the thread's TID will | |
1311 | be yet. Just enable event reporting and otherwise ignore | |
1312 | it. */ | |
1313 | ||
4d062f1a PA |
1314 | /* In that case, we're not stopped in a fork syscall and don't |
1315 | need this glibc bug workaround. */ | |
1316 | info->need_stale_parent_threads_check = 0; | |
1317 | ||
d90e17a7 | 1318 | err = info->td_thr_event_enable_p (th_p, 1); |
4105de34 | 1319 | if (err != TD_OK) |
4d062f1a PA |
1320 | error (_("Cannot enable thread event reporting for LWP %d: %s"), |
1321 | (int) ti.ti_lid, thread_db_err_str (err)); | |
4105de34 DJ |
1322 | |
1323 | return 0; | |
1324 | } | |
1325 | ||
4d062f1a PA |
1326 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1327 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1328 | avoid doing the work if we know we don't have to. */ | |
1329 | if (info->need_stale_parent_threads_check) | |
1330 | { | |
1331 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
1332 | if (tgid != -1 && tgid != info->pid) | |
1333 | return 0; | |
1334 | } | |
1335 | ||
1336 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1337 | tp = find_thread_ptid (ptid); |
403fe197 | 1338 | if (tp == NULL || tp->private == NULL) |
93815fbf | 1339 | attach_thread (ptid, th_p, &ti); |
fb0e1ba7 MK |
1340 | |
1341 | return 0; | |
1342 | } | |
1343 | ||
4c28f408 PA |
1344 | /* Search for new threads, accessing memory through stopped thread |
1345 | PTID. */ | |
1346 | ||
fb0e1ba7 | 1347 | static void |
d90e17a7 | 1348 | thread_db_find_new_threads_1 (ptid_t ptid) |
fb0e1ba7 MK |
1349 | { |
1350 | td_err_e err; | |
4c28f408 | 1351 | struct lwp_info *lp; |
d90e17a7 PA |
1352 | struct thread_db_info *info; |
1353 | int pid = ptid_get_pid (ptid); | |
4c28f408 PA |
1354 | |
1355 | /* In linux, we can only read memory through a stopped lwp. */ | |
1356 | ALL_LWPS (lp, ptid) | |
d90e17a7 | 1357 | if (lp->stopped && ptid_get_pid (lp->ptid) == pid) |
4c28f408 PA |
1358 | break; |
1359 | ||
1360 | if (!lp) | |
1361 | /* There is no stopped thread. Bail out. */ | |
1362 | return; | |
fb0e1ba7 | 1363 | |
d90e17a7 PA |
1364 | info = get_thread_db_info (GET_PID (ptid)); |
1365 | ||
4c28f408 | 1366 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1367 | info->proc_handle.ptid = ptid; |
fb0e1ba7 | 1368 | /* Iterate over all user-space threads to discover new threads. */ |
d90e17a7 PA |
1369 | err = info->td_ta_thr_iter_p (info->thread_agent, find_new_threads_callback, |
1370 | info, TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
1371 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); | |
fb0e1ba7 | 1372 | if (err != TD_OK) |
8a3fe4f8 | 1373 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); |
fb0e1ba7 MK |
1374 | } |
1375 | ||
28439f5e PA |
1376 | static void |
1377 | thread_db_find_new_threads (struct target_ops *ops) | |
1378 | { | |
d90e17a7 PA |
1379 | struct thread_db_info *info; |
1380 | ||
1381 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
1382 | ||
1383 | if (info == NULL) | |
1384 | return; | |
1385 | ||
1386 | thread_db_find_new_threads_1 (inferior_ptid); | |
28439f5e PA |
1387 | } |
1388 | ||
fb0e1ba7 | 1389 | static char * |
117de6a9 | 1390 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1391 | { |
e09875d4 | 1392 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1393 | struct target_ops *beneath; |
17faa917 DJ |
1394 | |
1395 | if (thread_info != NULL && thread_info->private != NULL) | |
fb0e1ba7 MK |
1396 | { |
1397 | static char buf[64]; | |
17faa917 | 1398 | thread_t tid; |
fb0e1ba7 | 1399 | |
17faa917 | 1400 | tid = thread_info->private->tid; |
17faa917 DJ |
1401 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
1402 | tid, GET_LWP (ptid)); | |
fb0e1ba7 MK |
1403 | |
1404 | return buf; | |
1405 | } | |
1406 | ||
117de6a9 PA |
1407 | beneath = find_target_beneath (ops); |
1408 | if (beneath->to_pid_to_str (beneath, ptid)) | |
1409 | return beneath->to_pid_to_str (beneath, ptid); | |
fb0e1ba7 | 1410 | |
39f77062 | 1411 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1412 | } |
1413 | ||
28b17333 DJ |
1414 | /* Return a string describing the state of the thread specified by |
1415 | INFO. */ | |
1416 | ||
1417 | static char * | |
1418 | thread_db_extra_thread_info (struct thread_info *info) | |
1419 | { | |
17faa917 DJ |
1420 | if (info->private == NULL) |
1421 | return NULL; | |
1422 | ||
28b17333 DJ |
1423 | if (info->private->dying) |
1424 | return "Exiting"; | |
1425 | ||
1426 | return NULL; | |
1427 | } | |
1428 | ||
b2756930 KB |
1429 | /* Get the address of the thread local variable in load module LM which |
1430 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1431 | |
1432 | static CORE_ADDR | |
117de6a9 PA |
1433 | thread_db_get_thread_local_address (struct target_ops *ops, |
1434 | ptid_t ptid, | |
b2756930 | 1435 | CORE_ADDR lm, |
b4acd559 | 1436 | CORE_ADDR offset) |
3f47be5c | 1437 | { |
17faa917 | 1438 | struct thread_info *thread_info; |
117de6a9 | 1439 | struct target_ops *beneath; |
17faa917 | 1440 | |
4105de34 | 1441 | /* If we have not discovered any threads yet, check now. */ |
d90e17a7 PA |
1442 | if (!have_threads (ptid)) |
1443 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1444 | |
17faa917 | 1445 | /* Find the matching thread. */ |
e09875d4 | 1446 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1447 | |
17faa917 | 1448 | if (thread_info != NULL && thread_info->private != NULL) |
3f47be5c | 1449 | { |
3f47be5c | 1450 | td_err_e err; |
3f47be5c | 1451 | void *address; |
d90e17a7 PA |
1452 | struct thread_db_info *info; |
1453 | ||
1454 | info = get_thread_db_info (GET_PID (ptid)); | |
3f47be5c EZ |
1455 | |
1456 | /* glibc doesn't provide the needed interface. */ | |
d90e17a7 | 1457 | if (!info->td_thr_tls_get_addr_p) |
109c3e39 AC |
1458 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
1459 | _("No TLS library support")); | |
3f47be5c | 1460 | |
b2756930 KB |
1461 | /* Caller should have verified that lm != 0. */ |
1462 | gdb_assert (lm != 0); | |
3f47be5c | 1463 | |
3f47be5c | 1464 | /* Finally, get the address of the variable. */ |
d90e17a7 PA |
1465 | err = info->td_thr_tls_get_addr_p (&thread_info->private->th, |
1466 | (void *)(size_t) lm, | |
1467 | offset, &address); | |
3f47be5c EZ |
1468 | |
1469 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1470 | /* The memory hasn't been allocated, yet. */ | |
1471 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1472 | /* Now, if libthread_db provided the initialization image's |
1473 | address, we *could* try to build a non-lvalue value from | |
1474 | the initialization image. */ | |
109c3e39 AC |
1475 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1476 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1477 | #endif |
1478 | ||
1479 | /* Something else went wrong. */ | |
1480 | if (err != TD_OK) | |
109c3e39 AC |
1481 | throw_error (TLS_GENERIC_ERROR, |
1482 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1483 | |
1484 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1485 | /* Do proper sign extension for the target. */ |
1486 | gdb_assert (exec_bfd); | |
1487 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1488 | ? (CORE_ADDR) (intptr_t) address | |
1489 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1490 | } |
1491 | ||
117de6a9 PA |
1492 | beneath = find_target_beneath (ops); |
1493 | if (beneath->to_get_thread_local_address) | |
1494 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); | |
93ad78a7 | 1495 | else |
109c3e39 AC |
1496 | throw_error (TLS_GENERIC_ERROR, |
1497 | _("TLS not supported on this target")); | |
3f47be5c EZ |
1498 | } |
1499 | ||
0ef643c8 JB |
1500 | /* Callback routine used to find a thread based on the TID part of |
1501 | its PTID. */ | |
1502 | ||
1503 | static int | |
1504 | thread_db_find_thread_from_tid (struct thread_info *thread, void *data) | |
1505 | { | |
1506 | long *tid = (long *) data; | |
1507 | ||
1508 | if (thread->private->tid == *tid) | |
1509 | return 1; | |
1510 | ||
1511 | return 0; | |
1512 | } | |
1513 | ||
1514 | /* Implement the to_get_ada_task_ptid target method for this target. */ | |
1515 | ||
1516 | static ptid_t | |
1517 | thread_db_get_ada_task_ptid (long lwp, long thread) | |
1518 | { | |
1519 | struct thread_info *thread_info; | |
1520 | ||
d90e17a7 | 1521 | thread_db_find_new_threads_1 (inferior_ptid); |
0ef643c8 JB |
1522 | thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread); |
1523 | ||
1524 | gdb_assert (thread_info != NULL); | |
1525 | ||
1526 | return (thread_info->ptid); | |
1527 | } | |
1528 | ||
4d062f1a PA |
1529 | static void |
1530 | thread_db_resume (struct target_ops *ops, | |
1531 | ptid_t ptid, int step, enum target_signal signo) | |
1532 | { | |
1533 | struct target_ops *beneath = find_target_beneath (ops); | |
1534 | struct thread_db_info *info; | |
1535 | ||
1536 | if (ptid_equal (ptid, minus_one_ptid)) | |
1537 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
1538 | else | |
1539 | info = get_thread_db_info (GET_PID (ptid)); | |
1540 | ||
1541 | /* This workaround is only needed for child fork lwps stopped in a | |
1542 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1543 | workaround can be disabled. */ | |
1544 | if (info) | |
1545 | info->need_stale_parent_threads_check = 0; | |
1546 | ||
1547 | beneath->to_resume (beneath, ptid, step, signo); | |
1548 | } | |
1549 | ||
fb0e1ba7 MK |
1550 | static void |
1551 | init_thread_db_ops (void) | |
1552 | { | |
1553 | thread_db_ops.to_shortname = "multi-thread"; | |
1554 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1555 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
1556 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 1557 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 1558 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 1559 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
fb0e1ba7 MK |
1560 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
1561 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1562 | thread_db_ops.to_stratum = thread_stratum; | |
1563 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1564 | thread_db_ops.to_get_thread_local_address |
1565 | = thread_db_get_thread_local_address; | |
28b17333 | 1566 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 1567 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 MK |
1568 | thread_db_ops.to_magic = OPS_MAGIC; |
1569 | } | |
1570 | ||
2c0b251b PA |
1571 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1572 | extern initialize_file_ftype _initialize_thread_db; | |
1573 | ||
fb0e1ba7 MK |
1574 | void |
1575 | _initialize_thread_db (void) | |
1576 | { | |
17a37d48 PP |
1577 | init_thread_db_ops (); |
1578 | add_target (&thread_db_ops); | |
1579 | ||
1580 | /* Defer loading of libthread_db.so until inferior is running. | |
1581 | This allows gdb to load correct libthread_db for a given | |
1582 | executable -- there could be mutiple versions of glibc, | |
1583 | compiled with LinuxThreads or NPTL, and until there is | |
1584 | a running inferior, we can't tell which libthread_db is | |
1585 | the correct one to load. */ | |
1586 | ||
1587 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1588 | ||
1589 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1590 | class_support, | |
1591 | &libthread_db_search_path, _("\ | |
1592 | Set search path for libthread_db."), _("\ | |
1593 | Show the current search path or libthread_db."), _("\ | |
1594 | This path is used to search for libthread_db to be loaded into \ | |
1595 | gdb itself."), | |
1596 | NULL, | |
1597 | NULL, | |
1598 | &setlist, &showlist); | |
1599 | /* Add ourselves to objfile event chain. */ | |
1600 | observer_attach_new_objfile (thread_db_new_objfile); | |
fb0e1ba7 | 1601 | } |