Commit | Line | Data |
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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
4c38e0a4 JB |
3 | Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, |
4 | 2010 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 | ||
02d868e8 PP |
78 | /* If non-zero, print details of libthread_db processing. */ |
79 | ||
80 | static int libthread_db_debug; | |
81 | ||
82 | static void | |
83 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
84 | struct cmd_list_element *c, const char *value) | |
85 | { | |
86 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
87 | } | |
88 | ||
89 | ||
8605d56e AC |
90 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
91 | threads. */ | |
fb0e1ba7 | 92 | |
fb0e1ba7 MK |
93 | /* This module's target vector. */ |
94 | static struct target_ops thread_db_ops; | |
95 | ||
fb0e1ba7 MK |
96 | /* Non-zero if we have determined the signals used by the threads |
97 | library. */ | |
98 | static int thread_signals; | |
99 | static sigset_t thread_stop_set; | |
100 | static sigset_t thread_print_set; | |
101 | ||
d90e17a7 PA |
102 | struct thread_db_info |
103 | { | |
104 | struct thread_db_info *next; | |
105 | ||
106 | /* Process id this object refers to. */ | |
107 | int pid; | |
108 | ||
109 | /* Handle from dlopen for libthread_db.so. */ | |
110 | void *handle; | |
111 | ||
112 | /* Structure that identifies the child process for the | |
113 | <proc_service.h> interface. */ | |
114 | struct ps_prochandle proc_handle; | |
115 | ||
116 | /* Connection to the libthread_db library. */ | |
117 | td_thragent_t *thread_agent; | |
118 | ||
4d062f1a PA |
119 | /* True if we need to apply the workaround for glibc/BZ5983. When |
120 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
121 | list, nptl_db returns the parent's threads in addition to the new | |
122 | (single) child thread. If this flag is set, we do extra work to | |
123 | be able to ignore such stale entries. */ | |
124 | int need_stale_parent_threads_check; | |
125 | ||
d90e17a7 PA |
126 | /* Location of the thread creation event breakpoint. The code at |
127 | this location in the child process will be called by the pthread | |
128 | library whenever a new thread is created. By setting a special | |
129 | breakpoint at this location, GDB can detect when a new thread is | |
130 | created. We obtain this location via the td_ta_event_addr | |
131 | call. */ | |
132 | CORE_ADDR td_create_bp_addr; | |
fb0e1ba7 | 133 | |
d90e17a7 PA |
134 | /* Location of the thread death event breakpoint. */ |
135 | CORE_ADDR td_death_bp_addr; | |
fb0e1ba7 | 136 | |
d90e17a7 | 137 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 138 | |
d90e17a7 | 139 | td_err_e (*td_init_p) (void); |
fb0e1ba7 | 140 | |
d90e17a7 | 141 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
b4acd559 | 142 | td_thragent_t **ta); |
d90e17a7 PA |
143 | td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
144 | td_thrhandle_t *__th); | |
145 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, | |
146 | lwpid_t lwpid, td_thrhandle_t *th); | |
147 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
148 | td_thr_iter_f *callback, void *cbdata_p, | |
149 | td_thr_state_e state, int ti_pri, | |
150 | sigset_t *ti_sigmask_p, | |
151 | unsigned int ti_user_flags); | |
152 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
153 | td_event_e event, td_notify_t *ptr); | |
154 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
155 | td_thr_events_t *event); | |
21e1bee4 PP |
156 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
157 | td_thr_events_t *event); | |
d90e17a7 PA |
158 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
159 | td_event_msg_t *msg); | |
160 | ||
161 | td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
162 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
163 | td_thrinfo_t *infop); | |
164 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, | |
165 | int event); | |
166 | ||
167 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
168 | psaddr_t map_address, |
169 | size_t offset, psaddr_t *address); | |
d90e17a7 PA |
170 | }; |
171 | ||
172 | /* List of known processes using thread_db, and the required | |
173 | bookkeeping. */ | |
174 | struct thread_db_info *thread_db_list; | |
175 | ||
176 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 177 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 PA |
178 | |
179 | /* Add the current inferior to the list of processes using libpthread. | |
180 | Return a pointer to the newly allocated object that was added to | |
181 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
182 | LIBTHREAD_DB_SO. */ | |
183 | ||
184 | static struct thread_db_info * | |
185 | add_thread_db_info (void *handle) | |
186 | { | |
d90e17a7 PA |
187 | struct thread_db_info *info; |
188 | ||
189 | info = xcalloc (1, sizeof (*info)); | |
190 | info->pid = ptid_get_pid (inferior_ptid); | |
191 | info->handle = handle; | |
4d062f1a | 192 | info->need_stale_parent_threads_check = 1; |
d90e17a7 PA |
193 | |
194 | info->next = thread_db_list; | |
195 | thread_db_list = info; | |
196 | ||
197 | return info; | |
198 | } | |
199 | ||
200 | /* Return the thread_db_info object representing the bookkeeping | |
201 | related to process PID, if any; NULL otherwise. */ | |
202 | ||
203 | static struct thread_db_info * | |
204 | get_thread_db_info (int pid) | |
205 | { | |
206 | struct thread_db_info *info; | |
207 | ||
208 | for (info = thread_db_list; info; info = info->next) | |
209 | if (pid == info->pid) | |
210 | return info; | |
211 | ||
212 | return NULL; | |
213 | } | |
214 | ||
215 | /* When PID has exited or has been detached, we no longer want to keep | |
216 | track of it as using libpthread. Call this function to discard | |
217 | thread_db related info related to PID. Note that this closes | |
218 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
219 | ||
220 | static void | |
221 | delete_thread_db_info (int pid) | |
222 | { | |
223 | struct thread_db_info *info, *info_prev; | |
224 | ||
225 | info_prev = NULL; | |
226 | ||
227 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
228 | if (pid == info->pid) | |
229 | break; | |
230 | ||
231 | if (info == NULL) | |
232 | return; | |
233 | ||
234 | if (info->handle != NULL) | |
235 | dlclose (info->handle); | |
236 | ||
237 | if (info_prev) | |
238 | info_prev->next = info->next; | |
239 | else | |
240 | thread_db_list = info->next; | |
241 | ||
242 | xfree (info); | |
243 | } | |
fb0e1ba7 MK |
244 | |
245 | /* Prototypes for local functions. */ | |
02c6c942 PP |
246 | static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
247 | const td_thrinfo_t *ti_p); | |
17faa917 | 248 | static void detach_thread (ptid_t ptid); |
fb0e1ba7 MK |
249 | \f |
250 | ||
5365276c DJ |
251 | /* Use "struct private_thread_info" to cache thread state. This is |
252 | a substantial optimization. */ | |
253 | ||
fb0e1ba7 MK |
254 | struct private_thread_info |
255 | { | |
a2f23071 DJ |
256 | /* Flag set when we see a TD_DEATH event for this thread. */ |
257 | unsigned int dying:1; | |
258 | ||
5365276c | 259 | /* Cached thread state. */ |
5365276c | 260 | td_thrhandle_t th; |
17faa917 | 261 | thread_t tid; |
fb0e1ba7 | 262 | }; |
fb0e1ba7 | 263 | \f |
21bf60fe | 264 | |
fb0e1ba7 MK |
265 | static char * |
266 | thread_db_err_str (td_err_e err) | |
267 | { | |
268 | static char buf[64]; | |
269 | ||
270 | switch (err) | |
271 | { | |
272 | case TD_OK: | |
273 | return "generic 'call succeeded'"; | |
274 | case TD_ERR: | |
275 | return "generic error"; | |
276 | case TD_NOTHR: | |
277 | return "no thread to satisfy query"; | |
278 | case TD_NOSV: | |
279 | return "no sync handle to satisfy query"; | |
280 | case TD_NOLWP: | |
281 | return "no LWP to satisfy query"; | |
282 | case TD_BADPH: | |
283 | return "invalid process handle"; | |
284 | case TD_BADTH: | |
285 | return "invalid thread handle"; | |
286 | case TD_BADSH: | |
287 | return "invalid synchronization handle"; | |
288 | case TD_BADTA: | |
289 | return "invalid thread agent"; | |
290 | case TD_BADKEY: | |
291 | return "invalid key"; | |
292 | case TD_NOMSG: | |
293 | return "no event message for getmsg"; | |
294 | case TD_NOFPREGS: | |
295 | return "FPU register set not available"; | |
296 | case TD_NOLIBTHREAD: | |
297 | return "application not linked with libthread"; | |
298 | case TD_NOEVENT: | |
299 | return "requested event is not supported"; | |
300 | case TD_NOCAPAB: | |
301 | return "capability not available"; | |
302 | case TD_DBERR: | |
303 | return "debugger service failed"; | |
304 | case TD_NOAPLIC: | |
305 | return "operation not applicable to"; | |
306 | case TD_NOTSD: | |
307 | return "no thread-specific data for this thread"; | |
308 | case TD_MALLOC: | |
309 | return "malloc failed"; | |
310 | case TD_PARTIALREG: | |
311 | return "only part of register set was written/read"; | |
312 | case TD_NOXREGS: | |
313 | return "X register set not available for this thread"; | |
59f80f10 DJ |
314 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
315 | case TD_NOTALLOC: | |
316 | return "thread has not yet allocated TLS for given module"; | |
317 | #endif | |
318 | #ifdef THREAD_DB_HAS_TD_VERSION | |
319 | case TD_VERSION: | |
320 | return "versions of libpthread and libthread_db do not match"; | |
321 | #endif | |
322 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
323 | case TD_NOTLS: | |
324 | return "there is no TLS segment in the given module"; | |
325 | #endif | |
fb0e1ba7 MK |
326 | default: |
327 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
328 | return buf; | |
329 | } | |
330 | } | |
fb0e1ba7 | 331 | \f |
4105de34 DJ |
332 | /* Return 1 if any threads have been registered. There may be none if |
333 | the threading library is not fully initialized yet. */ | |
334 | ||
335 | static int | |
d90e17a7 | 336 | have_threads_callback (struct thread_info *thread, void *args) |
4105de34 | 337 | { |
d90e17a7 | 338 | int pid = * (int *) args; |
e0881a8e | 339 | |
d90e17a7 PA |
340 | if (ptid_get_pid (thread->ptid) != pid) |
341 | return 0; | |
342 | ||
e3bc4218 | 343 | return thread->private != NULL; |
4105de34 DJ |
344 | } |
345 | ||
346 | static int | |
d90e17a7 | 347 | have_threads (ptid_t ptid) |
4105de34 | 348 | { |
d90e17a7 PA |
349 | int pid = ptid_get_pid (ptid); |
350 | ||
351 | return iterate_over_threads (have_threads_callback, &pid) != NULL; | |
4105de34 DJ |
352 | } |
353 | ||
d90e17a7 PA |
354 | struct thread_get_info_inout |
355 | { | |
356 | struct thread_info *thread_info; | |
357 | struct thread_db_info *thread_db_info; | |
358 | }; | |
359 | ||
5365276c | 360 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 361 | threads to LWPs. |
5365276c DJ |
362 | |
363 | THP is a handle to the current thread; if INFOP is not NULL, the | |
364 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
365 | *INFOP. |
366 | ||
367 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
368 | zero is returned to indicate success. */ | |
5365276c DJ |
369 | |
370 | static int | |
d90e17a7 | 371 | thread_get_info_callback (const td_thrhandle_t *thp, void *argp) |
5365276c DJ |
372 | { |
373 | td_thrinfo_t ti; | |
374 | td_err_e err; | |
5365276c | 375 | ptid_t thread_ptid; |
d90e17a7 PA |
376 | struct thread_get_info_inout *inout; |
377 | struct thread_db_info *info; | |
378 | ||
379 | inout = argp; | |
380 | info = inout->thread_db_info; | |
5365276c | 381 | |
d90e17a7 | 382 | err = info->td_thr_get_info_p (thp, &ti); |
5365276c | 383 | if (err != TD_OK) |
8a3fe4f8 | 384 | error (_("thread_get_info_callback: cannot get thread info: %s"), |
5365276c DJ |
385 | thread_db_err_str (err)); |
386 | ||
387 | /* Fill the cache. */ | |
d90e17a7 | 388 | thread_ptid = ptid_build (info->pid, ti.ti_lid, 0); |
e09875d4 | 389 | inout->thread_info = find_thread_ptid (thread_ptid); |
5365276c | 390 | |
b9b5d7ea | 391 | /* In the case of a zombie thread, don't continue. We don't want to |
f90ef764 | 392 | attach to it thinking it is a new thread. */ |
b9b5d7ea | 393 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
d90e17a7 | 394 | return TD_THR_ZOMBIE; |
b9b5d7ea | 395 | |
d90e17a7 | 396 | if (inout->thread_info == NULL) |
5365276c DJ |
397 | { |
398 | /* New thread. Attach to it now (why wait?). */ | |
d90e17a7 PA |
399 | if (!have_threads (thread_ptid)) |
400 | thread_db_find_new_threads_1 (thread_ptid); | |
4c28f408 PA |
401 | else |
402 | attach_thread (thread_ptid, thp, &ti); | |
e09875d4 | 403 | inout->thread_info = find_thread_ptid (thread_ptid); |
d90e17a7 | 404 | gdb_assert (inout->thread_info != NULL); |
5365276c DJ |
405 | } |
406 | ||
5365276c DJ |
407 | return 0; |
408 | } | |
5365276c | 409 | \f |
fb0e1ba7 MK |
410 | /* Convert between user-level thread ids and LWP ids. */ |
411 | ||
39f77062 KB |
412 | static ptid_t |
413 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 | 414 | { |
fb0e1ba7 MK |
415 | td_thrhandle_t th; |
416 | td_err_e err; | |
d90e17a7 PA |
417 | struct thread_db_info *info; |
418 | struct thread_get_info_inout io = {0}; | |
fb0e1ba7 | 419 | |
17faa917 DJ |
420 | /* This ptid comes from linux-nat.c, which should always fill in the |
421 | LWP. */ | |
422 | gdb_assert (GET_LWP (ptid) != 0); | |
fb0e1ba7 | 423 | |
d90e17a7 PA |
424 | info = get_thread_db_info (GET_PID (ptid)); |
425 | ||
4c28f408 | 426 | /* Access an lwp we know is stopped. */ |
d90e17a7 PA |
427 | info->proc_handle.ptid = ptid; |
428 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); | |
fb0e1ba7 | 429 | if (err != TD_OK) |
8a3fe4f8 | 430 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
39f77062 | 431 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 432 | |
b9b5d7ea JJ |
433 | /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the |
434 | event thread has already died. If another gdb interface has called | |
435 | thread_alive() previously, the thread won't be found on the thread list | |
436 | anymore. In that case, we don't want to process this ptid anymore | |
437 | to avoid the possibility of later treating it as a newly | |
438 | discovered thread id that we should add to the list. Thus, | |
439 | we return a -1 ptid which is also how the thread list marks a | |
440 | dead thread. */ | |
d90e17a7 PA |
441 | io.thread_db_info = info; |
442 | io.thread_info = NULL; | |
443 | if (thread_get_info_callback (&th, &io) == TD_THR_ZOMBIE | |
444 | && io.thread_info == NULL) | |
445 | return minus_one_ptid; | |
b9b5d7ea | 446 | |
17faa917 DJ |
447 | gdb_assert (ptid_get_tid (ptid) == 0); |
448 | return ptid; | |
fb0e1ba7 MK |
449 | } |
450 | \f | |
451 | ||
4c28f408 PA |
452 | /* Attach to lwp PTID, doing whatever else is required to have this |
453 | LWP under the debugger's control --- e.g., enabling event | |
454 | reporting. Returns true on success. */ | |
455 | int | |
456 | thread_db_attach_lwp (ptid_t ptid) | |
457 | { | |
458 | td_thrhandle_t th; | |
459 | td_thrinfo_t ti; | |
460 | td_err_e err; | |
d90e17a7 | 461 | struct thread_db_info *info; |
4c28f408 | 462 | |
d90e17a7 PA |
463 | info = get_thread_db_info (GET_PID (ptid)); |
464 | ||
465 | if (info == NULL) | |
4c28f408 PA |
466 | return 0; |
467 | ||
468 | /* This ptid comes from linux-nat.c, which should always fill in the | |
469 | LWP. */ | |
470 | gdb_assert (GET_LWP (ptid) != 0); | |
471 | ||
472 | /* Access an lwp we know is stopped. */ | |
d90e17a7 | 473 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
474 | |
475 | /* If we have only looked at the first thread before libpthread was | |
476 | initialized, we may not know its thread ID yet. Make sure we do | |
477 | before we add another thread to the list. */ | |
d90e17a7 PA |
478 | if (!have_threads (ptid)) |
479 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 480 | |
d90e17a7 | 481 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); |
4c28f408 PA |
482 | if (err != TD_OK) |
483 | /* Cannot find user-level thread. */ | |
484 | return 0; | |
485 | ||
d90e17a7 | 486 | err = info->td_thr_get_info_p (&th, &ti); |
4c28f408 PA |
487 | if (err != TD_OK) |
488 | { | |
489 | warning (_("Cannot get thread info: %s"), thread_db_err_str (err)); | |
490 | return 0; | |
491 | } | |
492 | ||
493 | attach_thread (ptid, &th, &ti); | |
494 | return 1; | |
495 | } | |
496 | ||
5220ea4c AC |
497 | static void * |
498 | verbose_dlsym (void *handle, const char *name) | |
499 | { | |
500 | void *sym = dlsym (handle, name); | |
501 | if (sym == NULL) | |
8a3fe4f8 | 502 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), name, dlerror ()); |
5220ea4c AC |
503 | return sym; |
504 | } | |
505 | ||
cdbc0b18 | 506 | static td_err_e |
d90e17a7 | 507 | enable_thread_event (int event, CORE_ADDR *bp) |
24557e30 AC |
508 | { |
509 | td_notify_t notify; | |
cdbc0b18 | 510 | td_err_e err; |
d90e17a7 PA |
511 | struct thread_db_info *info; |
512 | ||
513 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
24557e30 | 514 | |
4c28f408 | 515 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 516 | info->proc_handle.ptid = inferior_ptid; |
4c28f408 | 517 | |
24557e30 | 518 | /* Get the breakpoint address for thread EVENT. */ |
d90e17a7 | 519 | err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify); |
24557e30 | 520 | if (err != TD_OK) |
cdbc0b18 | 521 | return err; |
24557e30 AC |
522 | |
523 | /* Set up the breakpoint. */ | |
16451949 AS |
524 | gdb_assert (exec_bfd); |
525 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
a97b0ac8 | 526 | (target_gdbarch, |
16451949 AS |
527 | /* Do proper sign extension for the target. */ |
528 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
529 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
530 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
531 | ¤t_target)); | |
a6d9a66e | 532 | create_thread_event_breakpoint (target_gdbarch, *bp); |
24557e30 | 533 | |
cdbc0b18 | 534 | return TD_OK; |
24557e30 AC |
535 | } |
536 | ||
fb0e1ba7 MK |
537 | static void |
538 | enable_thread_event_reporting (void) | |
539 | { | |
540 | td_thr_events_t events; | |
fb0e1ba7 | 541 | td_err_e err; |
a2f23071 DJ |
542 | #ifdef HAVE_GNU_LIBC_VERSION_H |
543 | const char *libc_version; | |
544 | int libc_major, libc_minor; | |
545 | #endif | |
d90e17a7 PA |
546 | struct thread_db_info *info; |
547 | ||
548 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
fb0e1ba7 MK |
549 | |
550 | /* We cannot use the thread event reporting facility if these | |
551 | functions aren't available. */ | |
d90e17a7 PA |
552 | if (info->td_ta_event_addr_p == NULL |
553 | || info->td_ta_set_event_p == NULL | |
554 | || info->td_ta_event_getmsg_p == NULL | |
555 | || info->td_thr_event_enable_p == NULL) | |
fb0e1ba7 MK |
556 | return; |
557 | ||
558 | /* Set the process wide mask saying which events we're interested in. */ | |
559 | td_event_emptyset (&events); | |
560 | td_event_addset (&events, TD_CREATE); | |
a2f23071 DJ |
561 | |
562 | #ifdef HAVE_GNU_LIBC_VERSION_H | |
34091d9b | 563 | /* The event reporting facility is broken for TD_DEATH events in |
2ef52e77 | 564 | glibc 2.1.3, so don't enable it if we have glibc but a lower |
34091d9b | 565 | version. */ |
a2f23071 DJ |
566 | libc_version = gnu_get_libc_version (); |
567 | if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 | |
568 | && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) | |
fb0e1ba7 | 569 | #endif |
a2f23071 | 570 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 | 571 | |
d90e17a7 | 572 | err = info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
573 | if (err != TD_OK) |
574 | { | |
8a3fe4f8 | 575 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
576 | thread_db_err_str (err)); |
577 | return; | |
578 | } | |
579 | ||
580 | /* Delete previous thread event breakpoints, if any. */ | |
581 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
582 | info->td_create_bp_addr = 0; |
583 | info->td_death_bp_addr = 0; | |
fb0e1ba7 | 584 | |
24557e30 | 585 | /* Set up the thread creation event. */ |
d90e17a7 | 586 | err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr); |
cdbc0b18 | 587 | if (err != TD_OK) |
fb0e1ba7 | 588 | { |
8a3fe4f8 | 589 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
590 | thread_db_err_str (err)); |
591 | return; | |
592 | } | |
593 | ||
24557e30 | 594 | /* Set up the thread death event. */ |
d90e17a7 | 595 | err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr); |
cdbc0b18 | 596 | if (err != TD_OK) |
fb0e1ba7 | 597 | { |
8a3fe4f8 | 598 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
599 | thread_db_err_str (err)); |
600 | return; | |
601 | } | |
fb0e1ba7 MK |
602 | } |
603 | ||
456b0e24 PP |
604 | /* Same as thread_db_find_new_threads_1, but silently ignore errors. */ |
605 | ||
606 | static void | |
607 | thread_db_find_new_threads_silently (ptid_t ptid) | |
608 | { | |
609 | volatile struct gdb_exception except; | |
610 | ||
611 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
612 | { | |
02c6c942 | 613 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
614 | } |
615 | ||
02d868e8 | 616 | if (except.reason < 0 && libthread_db_debug) |
e0881a8e MS |
617 | { |
618 | exception_fprintf (gdb_stderr, except, | |
619 | "Warning: thread_db_find_new_threads_silently: "); | |
620 | } | |
456b0e24 PP |
621 | } |
622 | ||
d90e17a7 PA |
623 | /* Lookup a library in which given symbol resides. |
624 | Note: this is looking in GDB process, not in the inferior. | |
625 | Returns library name, or NULL. */ | |
626 | ||
627 | static const char * | |
628 | dladdr_to_soname (const void *addr) | |
629 | { | |
630 | Dl_info info; | |
631 | ||
632 | if (dladdr (addr, &info) != 0) | |
633 | return info.dli_fname; | |
634 | return NULL; | |
635 | } | |
636 | ||
17a37d48 PP |
637 | /* Attempt to initialize dlopen()ed libthread_db, described by HANDLE. |
638 | Return 1 on success. | |
639 | Failure could happen if libthread_db does not have symbols we expect, | |
640 | or when it refuses to work with the current inferior (e.g. due to | |
641 | version mismatch between libthread_db and libpthread). */ | |
642 | ||
643 | static int | |
d90e17a7 | 644 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
645 | { |
646 | td_err_e err; | |
647 | ||
648 | /* Initialize pointers to the dynamic library functions we will use. | |
649 | Essential functions first. */ | |
650 | ||
d90e17a7 PA |
651 | info->td_init_p = verbose_dlsym (info->handle, "td_init"); |
652 | if (info->td_init_p == NULL) | |
17a37d48 PP |
653 | return 0; |
654 | ||
d90e17a7 | 655 | err = info->td_init_p (); |
17a37d48 PP |
656 | if (err != TD_OK) |
657 | { | |
658 | warning (_("Cannot initialize libthread_db: %s"), thread_db_err_str (err)); | |
659 | return 0; | |
660 | } | |
661 | ||
d90e17a7 PA |
662 | info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new"); |
663 | if (info->td_ta_new_p == NULL) | |
17a37d48 PP |
664 | return 0; |
665 | ||
666 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 667 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
668 | |
669 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 670 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
671 | if (err != TD_OK) |
672 | { | |
02d868e8 | 673 | if (libthread_db_debug) |
17a37d48 PP |
674 | printf_unfiltered (_("td_ta_new failed: %s\n"), |
675 | thread_db_err_str (err)); | |
676 | else | |
677 | switch (err) | |
678 | { | |
679 | case TD_NOLIBTHREAD: | |
680 | #ifdef THREAD_DB_HAS_TD_VERSION | |
681 | case TD_VERSION: | |
682 | #endif | |
683 | /* The errors above are not unexpected and silently ignored: | |
684 | they just mean we haven't found correct version of | |
685 | libthread_db yet. */ | |
686 | break; | |
687 | default: | |
688 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
689 | } | |
690 | return 0; | |
691 | } | |
692 | ||
d90e17a7 PA |
693 | info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr"); |
694 | if (info->td_ta_map_id2thr_p == NULL) | |
17a37d48 PP |
695 | return 0; |
696 | ||
d90e17a7 PA |
697 | info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, "td_ta_map_lwp2thr"); |
698 | if (info->td_ta_map_lwp2thr_p == NULL) | |
17a37d48 PP |
699 | return 0; |
700 | ||
d90e17a7 PA |
701 | info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter"); |
702 | if (info->td_ta_thr_iter_p == NULL) | |
17a37d48 PP |
703 | return 0; |
704 | ||
d90e17a7 PA |
705 | info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate"); |
706 | if (info->td_thr_validate_p == NULL) | |
17a37d48 PP |
707 | return 0; |
708 | ||
d90e17a7 PA |
709 | info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info"); |
710 | if (info->td_thr_get_info_p == NULL) | |
17a37d48 PP |
711 | return 0; |
712 | ||
713 | /* These are not essential. */ | |
d90e17a7 PA |
714 | info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr"); |
715 | info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event"); | |
21e1bee4 | 716 | info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event"); |
d90e17a7 PA |
717 | info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); |
718 | info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); | |
719 | info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); | |
17a37d48 PP |
720 | |
721 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); | |
722 | ||
02d868e8 | 723 | if (libthread_db_debug || *libthread_db_search_path) |
d90e17a7 PA |
724 | { |
725 | const char *library; | |
17a37d48 | 726 | |
d90e17a7 PA |
727 | library = dladdr_to_soname (*info->td_ta_new_p); |
728 | if (library == NULL) | |
729 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 730 | |
d90e17a7 PA |
731 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
732 | library); | |
733 | } | |
17a37d48 | 734 | |
d90e17a7 PA |
735 | /* The thread library was detected. Activate the thread_db target |
736 | if this is the first process using it. */ | |
737 | if (thread_db_list->next == NULL) | |
738 | push_target (&thread_db_ops); | |
17a37d48 | 739 | |
d90e17a7 | 740 | enable_thread_event_reporting (); |
456b0e24 | 741 | |
099cb4fb | 742 | /* There appears to be a bug in glibc-2.3.6: calls to td_thr_get_info fail |
456b0e24 PP |
743 | with TD_ERR for statically linked executables if td_thr_get_info is |
744 | called before glibc has initialized itself. Silently ignore such | |
099cb4fb | 745 | errors, and let gdb enumerate threads again later. */ |
456b0e24 | 746 | thread_db_find_new_threads_silently (inferior_ptid); |
099cb4fb | 747 | |
d90e17a7 | 748 | return 1; |
17a37d48 PP |
749 | } |
750 | ||
751 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
752 | relative, or just LIBTHREAD_DB. */ | |
753 | ||
754 | static int | |
755 | try_thread_db_load (const char *library) | |
756 | { | |
757 | void *handle; | |
d90e17a7 | 758 | struct thread_db_info *info; |
17a37d48 | 759 | |
02d868e8 | 760 | if (libthread_db_debug) |
17a37d48 PP |
761 | printf_unfiltered (_("Trying host libthread_db library: %s.\n"), |
762 | library); | |
763 | handle = dlopen (library, RTLD_NOW); | |
764 | if (handle == NULL) | |
765 | { | |
02d868e8 | 766 | if (libthread_db_debug) |
17a37d48 PP |
767 | printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ()); |
768 | return 0; | |
769 | } | |
770 | ||
02d868e8 | 771 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
772 | { |
773 | void *td_init; | |
774 | ||
775 | td_init = dlsym (handle, "td_init"); | |
776 | if (td_init != NULL) | |
777 | { | |
778 | const char *const libpath = dladdr_to_soname (td_init); | |
779 | ||
780 | if (libpath != NULL) | |
781 | printf_unfiltered (_("Host %s resolved to: %s.\n"), | |
782 | library, libpath); | |
783 | } | |
784 | } | |
785 | ||
d90e17a7 PA |
786 | info = add_thread_db_info (handle); |
787 | ||
788 | if (try_thread_db_load_1 (info)) | |
17a37d48 PP |
789 | return 1; |
790 | ||
791 | /* This library "refused" to work on current inferior. */ | |
d90e17a7 | 792 | delete_thread_db_info (GET_PID (inferior_ptid)); |
17a37d48 PP |
793 | return 0; |
794 | } | |
795 | ||
796 | ||
797 | /* Search libthread_db_search_path for libthread_db which "agrees" | |
798 | to work on current inferior. */ | |
799 | ||
800 | static int | |
801 | thread_db_load_search (void) | |
802 | { | |
803 | char path[PATH_MAX]; | |
804 | const char *search_path = libthread_db_search_path; | |
805 | int rc = 0; | |
806 | ||
807 | while (*search_path) | |
808 | { | |
809 | const char *end = strchr (search_path, ':'); | |
e0881a8e | 810 | |
17a37d48 PP |
811 | if (end) |
812 | { | |
813 | size_t len = end - search_path; | |
e0881a8e | 814 | |
17a37d48 PP |
815 | if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) |
816 | { | |
817 | char *cp = xmalloc (len + 1); | |
e0881a8e | 818 | |
17a37d48 PP |
819 | memcpy (cp, search_path, len); |
820 | cp[len] = '\0'; | |
821 | warning (_("libthread_db_search_path component too long," | |
822 | " ignored: %s."), cp); | |
823 | xfree (cp); | |
824 | search_path += len + 1; | |
825 | continue; | |
826 | } | |
827 | memcpy (path, search_path, len); | |
828 | path[len] = '\0'; | |
829 | search_path += len + 1; | |
830 | } | |
831 | else | |
832 | { | |
833 | size_t len = strlen (search_path); | |
834 | ||
835 | if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
836 | { | |
837 | warning (_("libthread_db_search_path component too long," | |
838 | " ignored: %s."), search_path); | |
839 | break; | |
840 | } | |
841 | memcpy (path, search_path, len + 1); | |
842 | search_path += len; | |
843 | } | |
844 | strcat (path, "/"); | |
845 | strcat (path, LIBTHREAD_DB_SO); | |
846 | if (try_thread_db_load (path)) | |
847 | { | |
848 | rc = 1; | |
849 | break; | |
850 | } | |
851 | } | |
852 | if (rc == 0) | |
853 | rc = try_thread_db_load (LIBTHREAD_DB_SO); | |
854 | return rc; | |
855 | } | |
856 | ||
857 | /* Attempt to load and initialize libthread_db. | |
858 | Return 1 on success. | |
859 | */ | |
860 | ||
861 | static int | |
862 | thread_db_load (void) | |
863 | { | |
864 | struct objfile *obj; | |
d90e17a7 | 865 | struct thread_db_info *info; |
17a37d48 | 866 | |
d90e17a7 PA |
867 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
868 | ||
869 | if (info != NULL) | |
17a37d48 PP |
870 | return 1; |
871 | ||
872 | /* Don't attempt to use thread_db on targets which can not run | |
873 | (executables not running yet, core files) for now. */ | |
874 | if (!target_has_execution) | |
875 | return 0; | |
876 | ||
877 | /* Don't attempt to use thread_db for remote targets. */ | |
878 | if (!target_can_run (¤t_target)) | |
879 | return 0; | |
880 | ||
881 | if (thread_db_load_search ()) | |
882 | return 1; | |
883 | ||
884 | /* None of the libthread_db's on our search path, not the system default | |
885 | ones worked. If the executable is dynamically linked against | |
886 | libpthread, try loading libthread_db from the same directory. */ | |
887 | ||
888 | ALL_OBJFILES (obj) | |
889 | if (libpthread_name_p (obj->name)) | |
890 | { | |
891 | char path[PATH_MAX], *cp; | |
892 | ||
893 | gdb_assert (strlen (obj->name) < sizeof (path)); | |
894 | strcpy (path, obj->name); | |
895 | cp = strrchr (path, '/'); | |
896 | ||
897 | if (cp == NULL) | |
898 | { | |
899 | warning (_("Expected absolute pathname for libpthread in the" | |
900 | " inferior, but got %s."), path); | |
901 | } | |
902 | else if (cp + 1 + strlen (LIBTHREAD_DB_SO) + 1 > path + sizeof (path)) | |
903 | { | |
904 | warning (_("Unexpected: path to libpthread in the inferior is" | |
905 | " too long: %s"), path); | |
906 | } | |
907 | else | |
908 | { | |
909 | strcpy (cp + 1, LIBTHREAD_DB_SO); | |
910 | if (try_thread_db_load (path)) | |
911 | return 1; | |
912 | } | |
913 | warning (_("Unable to find libthread_db matching inferior's thread" | |
914 | " library, thread debugging will not be available.")); | |
915 | return 0; | |
916 | } | |
917 | /* Either this executable isn't using libpthread at all, or it is | |
918 | statically linked. Since we can't easily distinguish these two cases, | |
919 | no warning is issued. */ | |
920 | return 0; | |
921 | } | |
922 | ||
fb0e1ba7 | 923 | static void |
12b6a110 | 924 | disable_thread_event_reporting (struct thread_db_info *info) |
fb0e1ba7 | 925 | { |
21e1bee4 | 926 | if (info->td_ta_clear_event_p != NULL) |
12b6a110 PP |
927 | { |
928 | td_thr_events_t events; | |
fb0e1ba7 | 929 | |
12b6a110 PP |
930 | /* Set the process wide mask saying we aren't interested in any |
931 | events anymore. */ | |
21e1bee4 PP |
932 | td_event_fillset (&events); |
933 | info->td_ta_clear_event_p (info->thread_agent, &events); | |
12b6a110 | 934 | } |
fb0e1ba7 | 935 | |
d90e17a7 PA |
936 | info->td_create_bp_addr = 0; |
937 | info->td_death_bp_addr = 0; | |
fb0e1ba7 MK |
938 | } |
939 | ||
940 | static void | |
941 | check_thread_signals (void) | |
942 | { | |
21bf60fe | 943 | if (!thread_signals) |
fb0e1ba7 MK |
944 | { |
945 | sigset_t mask; | |
946 | int i; | |
947 | ||
669211f5 | 948 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
949 | sigemptyset (&thread_stop_set); |
950 | sigemptyset (&thread_print_set); | |
951 | ||
b9569773 | 952 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
953 | { |
954 | if (sigismember (&mask, i)) | |
955 | { | |
956 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
957 | sigaddset (&thread_stop_set, i); | |
958 | if (signal_print_update (target_signal_from_host (i), 0)) | |
959 | sigaddset (&thread_print_set, i); | |
960 | thread_signals = 1; | |
961 | } | |
962 | } | |
963 | } | |
fb0e1ba7 MK |
964 | } |
965 | ||
0ec9a092 DJ |
966 | /* Check whether thread_db is usable. This function is called when |
967 | an inferior is created (or otherwise acquired, e.g. attached to) | |
968 | and when new shared libraries are loaded into a running process. */ | |
969 | ||
970 | void | |
971 | check_for_thread_db (void) | |
fb0e1ba7 | 972 | { |
b5057acd | 973 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 974 | if (!thread_db_load ()) |
b5057acd | 975 | return; |
0ec9a092 DJ |
976 | } |
977 | ||
978 | static void | |
979 | thread_db_new_objfile (struct objfile *objfile) | |
980 | { | |
d90e17a7 PA |
981 | /* This observer must always be called with inferior_ptid set |
982 | correctly. */ | |
983 | ||
0ec9a092 DJ |
984 | if (objfile != NULL) |
985 | check_for_thread_db (); | |
fb0e1ba7 MK |
986 | } |
987 | ||
a2f23071 DJ |
988 | /* Attach to a new thread. This function is called when we receive a |
989 | TD_CREATE event or when we iterate over all threads and find one | |
02c6c942 | 990 | that wasn't already in our list. Returns true on success. */ |
a2f23071 | 991 | |
02c6c942 | 992 | static int |
39f77062 | 993 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 994 | const td_thrinfo_t *ti_p) |
fb0e1ba7 | 995 | { |
17faa917 DJ |
996 | struct private_thread_info *private; |
997 | struct thread_info *tp = NULL; | |
fb0e1ba7 | 998 | td_err_e err; |
d90e17a7 | 999 | struct thread_db_info *info; |
fb0e1ba7 | 1000 | |
a2f23071 DJ |
1001 | /* If we're being called after a TD_CREATE event, we may already |
1002 | know about this thread. There are two ways this can happen. We | |
1003 | may have iterated over all threads between the thread creation | |
1004 | and the TD_CREATE event, for instance when the user has issued | |
1005 | the `info threads' command before the SIGTRAP for hitting the | |
1006 | thread creation breakpoint was reported. Alternatively, the | |
1007 | thread may have exited and a new one been created with the same | |
1008 | thread ID. In the first case we don't need to do anything; in | |
1009 | the second case we should discard information about the dead | |
1010 | thread and attach to the new one. */ | |
1011 | if (in_thread_list (ptid)) | |
1012 | { | |
e09875d4 | 1013 | tp = find_thread_ptid (ptid); |
a2f23071 DJ |
1014 | gdb_assert (tp != NULL); |
1015 | ||
17faa917 DJ |
1016 | /* If tp->private is NULL, then GDB is already attached to this |
1017 | thread, but we do not know anything about it. We can learn | |
1018 | about it here. This can only happen if we have some other | |
1019 | way besides libthread_db to notice new threads (i.e. | |
1020 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread | |
1021 | exit, so this can not be a stale thread recreated with the | |
1022 | same ID. */ | |
1023 | if (tp->private != NULL) | |
1024 | { | |
1025 | if (!tp->private->dying) | |
02c6c942 | 1026 | return 0; |
a2f23071 | 1027 | |
17faa917 DJ |
1028 | delete_thread (ptid); |
1029 | tp = NULL; | |
1030 | } | |
a2f23071 DJ |
1031 | } |
1032 | ||
fb0e1ba7 MK |
1033 | check_thread_signals (); |
1034 | ||
9ee57c33 | 1035 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
02c6c942 | 1036 | return 0; /* A zombie thread -- do not attach. */ |
9ee57c33 DJ |
1037 | |
1038 | /* Under GNU/Linux, we have to attach to each and every thread. */ | |
17faa917 DJ |
1039 | if (tp == NULL |
1040 | && lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid))) < 0) | |
02c6c942 | 1041 | return 0; |
9ee57c33 | 1042 | |
17faa917 DJ |
1043 | /* Construct the thread's private data. */ |
1044 | private = xmalloc (sizeof (struct private_thread_info)); | |
1045 | memset (private, 0, sizeof (struct private_thread_info)); | |
1046 | ||
1047 | /* A thread ID of zero may mean the thread library has not initialized | |
1048 | yet. But we shouldn't even get here if that's the case. FIXME: | |
1049 | if we change GDB to always have at least one thread in the thread | |
1050 | list this will have to go somewhere else; maybe private == NULL | |
1051 | until the thread_db target claims it. */ | |
1052 | gdb_assert (ti_p->ti_tid != 0); | |
1053 | private->th = *th_p; | |
1054 | private->tid = ti_p->ti_tid; | |
1055 | ||
fb0e1ba7 | 1056 | /* Add the thread to GDB's thread list. */ |
17faa917 DJ |
1057 | if (tp == NULL) |
1058 | tp = add_thread_with_info (ptid, private); | |
1059 | else | |
1060 | tp->private = private; | |
5365276c | 1061 | |
d90e17a7 PA |
1062 | info = get_thread_db_info (GET_PID (ptid)); |
1063 | ||
fb0e1ba7 | 1064 | /* Enable thread event reporting for this thread. */ |
d90e17a7 | 1065 | err = info->td_thr_event_enable_p (th_p, 1); |
fb0e1ba7 | 1066 | if (err != TD_OK) |
8a3fe4f8 | 1067 | error (_("Cannot enable thread event reporting for %s: %s"), |
39f77062 | 1068 | target_pid_to_str (ptid), thread_db_err_str (err)); |
02c6c942 | 1069 | return 1; |
fb0e1ba7 MK |
1070 | } |
1071 | ||
1072 | static void | |
17faa917 | 1073 | detach_thread (ptid_t ptid) |
fb0e1ba7 | 1074 | { |
a2f23071 DJ |
1075 | struct thread_info *thread_info; |
1076 | ||
a2f23071 DJ |
1077 | /* Don't delete the thread now, because it still reports as active |
1078 | until it has executed a few instructions after the event | |
1079 | breakpoint - if we deleted it now, "info threads" would cause us | |
1080 | to re-attach to it. Just mark it as having had a TD_DEATH | |
1081 | event. This means that we won't delete it from our thread list | |
1082 | until we notice that it's dead (via prune_threads), or until | |
17faa917 DJ |
1083 | something re-uses its thread ID. We'll report the thread exit |
1084 | when the underlying LWP dies. */ | |
e09875d4 | 1085 | thread_info = find_thread_ptid (ptid); |
17faa917 | 1086 | gdb_assert (thread_info != NULL && thread_info->private != NULL); |
a2f23071 | 1087 | thread_info->private->dying = 1; |
fb0e1ba7 MK |
1088 | } |
1089 | ||
1090 | static void | |
136d6dae | 1091 | thread_db_detach (struct target_ops *ops, char *args, int from_tty) |
fb0e1ba7 | 1092 | { |
117de6a9 | 1093 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1094 | struct thread_db_info *info; |
117de6a9 | 1095 | |
d90e17a7 | 1096 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
c194fbe1 | 1097 | |
d90e17a7 PA |
1098 | if (info) |
1099 | { | |
12b6a110 | 1100 | disable_thread_event_reporting (info); |
7a7d3353 | 1101 | |
d90e17a7 PA |
1102 | /* Delete the old thread event breakpoints. Note that unlike |
1103 | when mourning, we can remove them here because there's still | |
1104 | a live inferior to poke at. In any case, GDB will not try to | |
1105 | insert anything in the inferior when removing a | |
1106 | breakpoint. */ | |
1107 | remove_thread_event_breakpoints (); | |
1108 | ||
1109 | delete_thread_db_info (GET_PID (inferior_ptid)); | |
1110 | } | |
4105de34 | 1111 | |
7a7d3353 | 1112 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1113 | |
1114 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1115 | ||
1116 | /* If there are no more processes using libpthread, detach the | |
1117 | thread_db target ops. */ | |
1118 | if (!thread_db_list) | |
1119 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1120 | } |
1121 | ||
fb0e1ba7 MK |
1122 | /* Check if PID is currently stopped at the location of a thread event |
1123 | breakpoint location. If it is, read the event message and act upon | |
1124 | the event. */ | |
1125 | ||
1126 | static void | |
39f77062 | 1127 | check_event (ptid_t ptid) |
fb0e1ba7 | 1128 | { |
515630c5 UW |
1129 | struct regcache *regcache = get_thread_regcache (ptid); |
1130 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
fb0e1ba7 MK |
1131 | td_event_msg_t msg; |
1132 | td_thrinfo_t ti; | |
1133 | td_err_e err; | |
1134 | CORE_ADDR stop_pc; | |
4d9850d3 | 1135 | int loop = 0; |
d90e17a7 PA |
1136 | struct thread_db_info *info; |
1137 | ||
1138 | info = get_thread_db_info (GET_PID (ptid)); | |
fb0e1ba7 MK |
1139 | |
1140 | /* Bail out early if we're not at a thread event breakpoint. */ | |
515630c5 UW |
1141 | stop_pc = regcache_read_pc (regcache) |
1142 | - gdbarch_decr_pc_after_break (gdbarch); | |
d90e17a7 PA |
1143 | if (stop_pc != info->td_create_bp_addr |
1144 | && stop_pc != info->td_death_bp_addr) | |
fb0e1ba7 MK |
1145 | return; |
1146 | ||
4c28f408 | 1147 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1148 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
1149 | |
1150 | /* If we have only looked at the first thread before libpthread was | |
1151 | initialized, we may not know its thread ID yet. Make sure we do | |
1152 | before we add another thread to the list. */ | |
d90e17a7 PA |
1153 | if (!have_threads (ptid)) |
1154 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 1155 | |
4d9850d3 JJ |
1156 | /* If we are at a create breakpoint, we do not know what new lwp |
1157 | was created and cannot specifically locate the event message for it. | |
1158 | We have to call td_ta_event_getmsg() to get | |
1159 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 1160 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 1161 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
1162 | This guarantees we will process the correct message before continuing |
1163 | from the breakpoint. | |
4d9850d3 JJ |
1164 | |
1165 | Currently, death events are not enabled. If they are enabled, | |
1166 | the death event can use the td_thr_event_getmsg() interface to | |
1167 | get the message specifically for that lwp and avoid looping | |
1168 | below. */ | |
1169 | ||
1170 | loop = 1; | |
1171 | ||
1172 | do | |
fb0e1ba7 | 1173 | { |
d90e17a7 | 1174 | err = info->td_ta_event_getmsg_p (info->thread_agent, &msg); |
4d9850d3 JJ |
1175 | if (err != TD_OK) |
1176 | { | |
1177 | if (err == TD_NOMSG) | |
1178 | return; | |
fb0e1ba7 | 1179 | |
8a3fe4f8 | 1180 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
1181 | thread_db_err_str (err)); |
1182 | } | |
fb0e1ba7 | 1183 | |
d90e17a7 | 1184 | err = info->td_thr_get_info_p (msg.th_p, &ti); |
4d9850d3 | 1185 | if (err != TD_OK) |
8a3fe4f8 | 1186 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 1187 | |
17faa917 | 1188 | ptid = ptid_build (GET_PID (ptid), ti.ti_lid, 0); |
fb0e1ba7 | 1189 | |
4d9850d3 JJ |
1190 | switch (msg.event) |
1191 | { | |
1192 | case TD_CREATE: | |
a2f23071 DJ |
1193 | /* Call attach_thread whether or not we already know about a |
1194 | thread with this thread ID. */ | |
93815fbf | 1195 | attach_thread (ptid, msg.th_p, &ti); |
fb0e1ba7 | 1196 | |
4d9850d3 | 1197 | break; |
fb0e1ba7 | 1198 | |
4d9850d3 | 1199 | case TD_DEATH: |
fb0e1ba7 | 1200 | |
4d9850d3 | 1201 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 1202 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 1203 | |
17faa917 | 1204 | detach_thread (ptid); |
fb0e1ba7 | 1205 | |
4d9850d3 | 1206 | break; |
fb0e1ba7 | 1207 | |
4d9850d3 | 1208 | default: |
8a3fe4f8 | 1209 | error (_("Spurious thread event.")); |
4d9850d3 | 1210 | } |
fb0e1ba7 | 1211 | } |
4d9850d3 | 1212 | while (loop); |
fb0e1ba7 MK |
1213 | } |
1214 | ||
39f77062 | 1215 | static ptid_t |
117de6a9 | 1216 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1217 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1218 | int options) | |
fb0e1ba7 | 1219 | { |
d90e17a7 | 1220 | struct thread_db_info *info; |
117de6a9 PA |
1221 | struct target_ops *beneath = find_target_beneath (ops); |
1222 | ||
47608cb1 | 1223 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1224 | |
b84876c2 PA |
1225 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1226 | return ptid; | |
1227 | ||
1111f4aa | 1228 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1229 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1230 | return ptid; | |
fb0e1ba7 | 1231 | |
d90e17a7 PA |
1232 | info = get_thread_db_info (GET_PID (ptid)); |
1233 | ||
1234 | /* If this process isn't using thread_db, we're done. */ | |
1235 | if (info == NULL) | |
1236 | return ptid; | |
1237 | ||
3f64f7b1 DJ |
1238 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1239 | { | |
d90e17a7 PA |
1240 | /* New image, it may or may not end up using thread_db. Assume |
1241 | not unless we find otherwise. */ | |
1242 | delete_thread_db_info (GET_PID (ptid)); | |
1243 | if (!thread_db_list) | |
1244 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1245 | |
6c95b8df PA |
1246 | /* Thread event breakpoints are deleted by |
1247 | update_breakpoints_after_exec. */ | |
1248 | ||
49fd4a42 | 1249 | return ptid; |
3f64f7b1 DJ |
1250 | } |
1251 | ||
4105de34 DJ |
1252 | /* If we do not know about the main thread yet, this would be a good time to |
1253 | find it. */ | |
d90e17a7 PA |
1254 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid)) |
1255 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1256 | |
fb0e1ba7 MK |
1257 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
1258 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
1259 | /* Check for a thread event. */ | |
39f77062 | 1260 | check_event (ptid); |
fb0e1ba7 | 1261 | |
d90e17a7 | 1262 | if (have_threads (ptid)) |
4105de34 DJ |
1263 | { |
1264 | /* Change ptids back into the higher level PID + TID format. If | |
1265 | the thread is dead and no longer on the thread list, we will | |
1266 | get back a dead ptid. This can occur if the thread death | |
1267 | event gets postponed by other simultaneous events. In such a | |
1268 | case, we want to just ignore the event and continue on. */ | |
1269 | ||
4105de34 DJ |
1270 | ptid = thread_from_lwp (ptid); |
1271 | if (GET_PID (ptid) == -1) | |
1272 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
1273 | } | |
fb0e1ba7 | 1274 | |
b9b5d7ea | 1275 | return ptid; |
fb0e1ba7 MK |
1276 | } |
1277 | ||
fb0e1ba7 | 1278 | static void |
136d6dae | 1279 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1280 | { |
117de6a9 PA |
1281 | struct target_ops *target_beneath = find_target_beneath (ops); |
1282 | ||
d90e17a7 | 1283 | delete_thread_db_info (GET_PID (inferior_ptid)); |
fb0e1ba7 | 1284 | |
d90e17a7 PA |
1285 | target_beneath->to_mourn_inferior (target_beneath); |
1286 | ||
6c95b8df PA |
1287 | /* Delete the old thread event breakpoints. Do this after mourning |
1288 | the inferior, so that we don't try to uninsert them. */ | |
1289 | remove_thread_event_breakpoints (); | |
1290 | ||
b26a6851 | 1291 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1292 | if (!thread_db_list) |
1293 | unpush_target (ops); | |
fb0e1ba7 MK |
1294 | } |
1295 | ||
02c6c942 PP |
1296 | struct callback_data |
1297 | { | |
1298 | struct thread_db_info *info; | |
1299 | int new_threads; | |
1300 | }; | |
1301 | ||
fb0e1ba7 MK |
1302 | static int |
1303 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1304 | { | |
1305 | td_thrinfo_t ti; | |
1306 | td_err_e err; | |
39f77062 | 1307 | ptid_t ptid; |
403fe197 | 1308 | struct thread_info *tp; |
02c6c942 PP |
1309 | struct callback_data *cb_data = data; |
1310 | struct thread_db_info *info = cb_data->info; | |
fb0e1ba7 | 1311 | |
d90e17a7 | 1312 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1313 | if (err != TD_OK) |
8a3fe4f8 | 1314 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1315 | thread_db_err_str (err)); |
fb0e1ba7 | 1316 | |
21bf60fe MK |
1317 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
1318 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 1319 | |
4105de34 DJ |
1320 | if (ti.ti_tid == 0) |
1321 | { | |
1322 | /* A thread ID of zero means that this is the main thread, but | |
1323 | glibc has not yet initialized thread-local storage and the | |
1324 | pthread library. We do not know what the thread's TID will | |
1325 | be yet. Just enable event reporting and otherwise ignore | |
1326 | it. */ | |
1327 | ||
4d062f1a PA |
1328 | /* In that case, we're not stopped in a fork syscall and don't |
1329 | need this glibc bug workaround. */ | |
1330 | info->need_stale_parent_threads_check = 0; | |
1331 | ||
d90e17a7 | 1332 | err = info->td_thr_event_enable_p (th_p, 1); |
4105de34 | 1333 | if (err != TD_OK) |
4d062f1a PA |
1334 | error (_("Cannot enable thread event reporting for LWP %d: %s"), |
1335 | (int) ti.ti_lid, thread_db_err_str (err)); | |
4105de34 DJ |
1336 | |
1337 | return 0; | |
1338 | } | |
1339 | ||
4d062f1a PA |
1340 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1341 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1342 | avoid doing the work if we know we don't have to. */ | |
1343 | if (info->need_stale_parent_threads_check) | |
1344 | { | |
1345 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1346 | |
4d062f1a PA |
1347 | if (tgid != -1 && tgid != info->pid) |
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1352 | tp = find_thread_ptid (ptid); |
403fe197 | 1353 | if (tp == NULL || tp->private == NULL) |
02c6c942 PP |
1354 | { |
1355 | if (attach_thread (ptid, th_p, &ti)) | |
1356 | cb_data->new_threads += 1; | |
1357 | else | |
1358 | /* Problem attaching this thread; perhaps it exited before we | |
1359 | could attach it? | |
1360 | This could mean that the thread list inside glibc itself is in | |
1361 | inconsistent state, and libthread_db could go on looping forever | |
1362 | (observed with glibc-2.3.6). To prevent that, terminate | |
1363 | iteration: thread_db_find_new_threads_2 will retry. */ | |
1364 | return 1; | |
1365 | } | |
fb0e1ba7 MK |
1366 | |
1367 | return 0; | |
1368 | } | |
1369 | ||
02c6c942 PP |
1370 | /* Helper for thread_db_find_new_threads_2. |
1371 | Returns number of new threads found. */ | |
1372 | ||
1373 | static int | |
1374 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1375 | td_err_e *errp) |
02c6c942 PP |
1376 | { |
1377 | volatile struct gdb_exception except; | |
1378 | struct callback_data data; | |
fb169834 | 1379 | td_err_e err = TD_ERR; |
02c6c942 PP |
1380 | |
1381 | data.info = info; | |
1382 | data.new_threads = 0; | |
1383 | ||
1384 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
1385 | { | |
1386 | /* Iterate over all user-space threads to discover new threads. */ | |
1387 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1388 | find_new_threads_callback, | |
1389 | &data, | |
1390 | TD_THR_ANY_STATE, | |
1391 | TD_THR_LOWEST_PRIORITY, | |
1392 | TD_SIGNO_MASK, | |
1393 | TD_THR_ANY_USER_FLAGS); | |
1394 | } | |
1395 | ||
02d868e8 | 1396 | if (libthread_db_debug) |
02c6c942 PP |
1397 | { |
1398 | if (except.reason < 0) | |
1399 | exception_fprintf (gdb_stderr, except, | |
1400 | "Warning: find_new_threads_once: "); | |
1401 | ||
1402 | printf_filtered (_("Found %d new threads in iteration %d.\n"), | |
1403 | data.new_threads, iteration); | |
1404 | } | |
1405 | ||
1406 | if (errp != NULL) | |
1407 | *errp = err; | |
1408 | ||
1409 | return data.new_threads; | |
1410 | } | |
1411 | ||
4c28f408 | 1412 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1413 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1414 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1415 | |
fb0e1ba7 | 1416 | static void |
02c6c942 | 1417 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 MK |
1418 | { |
1419 | td_err_e err; | |
4c28f408 | 1420 | struct lwp_info *lp; |
d90e17a7 PA |
1421 | struct thread_db_info *info; |
1422 | int pid = ptid_get_pid (ptid); | |
02c6c942 | 1423 | int i, loop; |
4c28f408 PA |
1424 | |
1425 | /* In linux, we can only read memory through a stopped lwp. */ | |
1426 | ALL_LWPS (lp, ptid) | |
d90e17a7 | 1427 | if (lp->stopped && ptid_get_pid (lp->ptid) == pid) |
4c28f408 PA |
1428 | break; |
1429 | ||
1430 | if (!lp) | |
1431 | /* There is no stopped thread. Bail out. */ | |
1432 | return; | |
fb0e1ba7 | 1433 | |
d90e17a7 PA |
1434 | info = get_thread_db_info (GET_PID (ptid)); |
1435 | ||
4c28f408 | 1436 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1437 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1438 | |
1439 | if (until_no_new) | |
1440 | { | |
1441 | /* Require 4 successive iterations which do not find any new threads. | |
1442 | The 4 is a heuristic: there is an inherent race here, and I have | |
1443 | seen that 2 iterations in a row are not always sufficient to | |
1444 | "capture" all threads. */ | |
1445 | for (i = 0, loop = 0; loop < 4; ++i, ++loop) | |
1446 | if (find_new_threads_once (info, i, NULL) != 0) | |
1447 | /* Found some new threads. Restart the loop from beginning. */ | |
1448 | loop = -1; | |
1449 | } | |
1450 | else | |
1451 | { | |
02c6c942 PP |
1452 | find_new_threads_once (info, 0, &err); |
1453 | if (err != TD_OK) | |
1454 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
1455 | } | |
fb0e1ba7 MK |
1456 | } |
1457 | ||
02c6c942 PP |
1458 | static void |
1459 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1460 | { | |
1461 | thread_db_find_new_threads_2 (ptid, 0); | |
1462 | } | |
1463 | ||
dc146f7c VP |
1464 | static int |
1465 | update_thread_core (struct lwp_info *info, void *closure) | |
1466 | { | |
1467 | info->core = linux_nat_core_of_thread_1 (info->ptid); | |
1468 | return 0; | |
1469 | } | |
02c6c942 | 1470 | |
28439f5e PA |
1471 | static void |
1472 | thread_db_find_new_threads (struct target_ops *ops) | |
1473 | { | |
d90e17a7 PA |
1474 | struct thread_db_info *info; |
1475 | ||
1476 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
1477 | ||
1478 | if (info == NULL) | |
1479 | return; | |
1480 | ||
1481 | thread_db_find_new_threads_1 (inferior_ptid); | |
dc146f7c VP |
1482 | |
1483 | iterate_over_lwps (minus_one_ptid /* iterate over all */, | |
1484 | update_thread_core, NULL); | |
28439f5e PA |
1485 | } |
1486 | ||
fb0e1ba7 | 1487 | static char * |
117de6a9 | 1488 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1489 | { |
e09875d4 | 1490 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1491 | struct target_ops *beneath; |
17faa917 DJ |
1492 | |
1493 | if (thread_info != NULL && thread_info->private != NULL) | |
fb0e1ba7 MK |
1494 | { |
1495 | static char buf[64]; | |
17faa917 | 1496 | thread_t tid; |
fb0e1ba7 | 1497 | |
17faa917 | 1498 | tid = thread_info->private->tid; |
17faa917 DJ |
1499 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
1500 | tid, GET_LWP (ptid)); | |
fb0e1ba7 MK |
1501 | |
1502 | return buf; | |
1503 | } | |
1504 | ||
117de6a9 PA |
1505 | beneath = find_target_beneath (ops); |
1506 | if (beneath->to_pid_to_str (beneath, ptid)) | |
1507 | return beneath->to_pid_to_str (beneath, ptid); | |
fb0e1ba7 | 1508 | |
39f77062 | 1509 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1510 | } |
1511 | ||
28b17333 DJ |
1512 | /* Return a string describing the state of the thread specified by |
1513 | INFO. */ | |
1514 | ||
1515 | static char * | |
1516 | thread_db_extra_thread_info (struct thread_info *info) | |
1517 | { | |
17faa917 DJ |
1518 | if (info->private == NULL) |
1519 | return NULL; | |
1520 | ||
28b17333 DJ |
1521 | if (info->private->dying) |
1522 | return "Exiting"; | |
1523 | ||
1524 | return NULL; | |
1525 | } | |
1526 | ||
b2756930 KB |
1527 | /* Get the address of the thread local variable in load module LM which |
1528 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1529 | |
1530 | static CORE_ADDR | |
117de6a9 PA |
1531 | thread_db_get_thread_local_address (struct target_ops *ops, |
1532 | ptid_t ptid, | |
b2756930 | 1533 | CORE_ADDR lm, |
b4acd559 | 1534 | CORE_ADDR offset) |
3f47be5c | 1535 | { |
17faa917 | 1536 | struct thread_info *thread_info; |
117de6a9 | 1537 | struct target_ops *beneath; |
17faa917 | 1538 | |
4105de34 | 1539 | /* If we have not discovered any threads yet, check now. */ |
d90e17a7 PA |
1540 | if (!have_threads (ptid)) |
1541 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1542 | |
17faa917 | 1543 | /* Find the matching thread. */ |
e09875d4 | 1544 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1545 | |
17faa917 | 1546 | if (thread_info != NULL && thread_info->private != NULL) |
3f47be5c | 1547 | { |
3f47be5c | 1548 | td_err_e err; |
00f515da | 1549 | psaddr_t address; |
d90e17a7 PA |
1550 | struct thread_db_info *info; |
1551 | ||
1552 | info = get_thread_db_info (GET_PID (ptid)); | |
3f47be5c EZ |
1553 | |
1554 | /* glibc doesn't provide the needed interface. */ | |
d90e17a7 | 1555 | if (!info->td_thr_tls_get_addr_p) |
109c3e39 AC |
1556 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
1557 | _("No TLS library support")); | |
3f47be5c | 1558 | |
b2756930 KB |
1559 | /* Caller should have verified that lm != 0. */ |
1560 | gdb_assert (lm != 0); | |
3f47be5c | 1561 | |
3f47be5c | 1562 | /* Finally, get the address of the variable. */ |
00f515da DE |
1563 | /* Note the cast through uintptr_t: this interface only works if |
1564 | a target address fits in a psaddr_t, which is a host pointer. | |
1565 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
d90e17a7 | 1566 | err = info->td_thr_tls_get_addr_p (&thread_info->private->th, |
00f515da | 1567 | (psaddr_t)(uintptr_t) lm, |
d90e17a7 | 1568 | offset, &address); |
3f47be5c EZ |
1569 | |
1570 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1571 | /* The memory hasn't been allocated, yet. */ | |
1572 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1573 | /* Now, if libthread_db provided the initialization image's |
1574 | address, we *could* try to build a non-lvalue value from | |
1575 | the initialization image. */ | |
109c3e39 AC |
1576 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1577 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1578 | #endif |
1579 | ||
1580 | /* Something else went wrong. */ | |
1581 | if (err != TD_OK) | |
109c3e39 AC |
1582 | throw_error (TLS_GENERIC_ERROR, |
1583 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1584 | |
1585 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1586 | /* Do proper sign extension for the target. */ |
1587 | gdb_assert (exec_bfd); | |
1588 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1589 | ? (CORE_ADDR) (intptr_t) address | |
1590 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1591 | } |
1592 | ||
117de6a9 PA |
1593 | beneath = find_target_beneath (ops); |
1594 | if (beneath->to_get_thread_local_address) | |
1595 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); | |
93ad78a7 | 1596 | else |
109c3e39 AC |
1597 | throw_error (TLS_GENERIC_ERROR, |
1598 | _("TLS not supported on this target")); | |
3f47be5c EZ |
1599 | } |
1600 | ||
0ef643c8 JB |
1601 | /* Callback routine used to find a thread based on the TID part of |
1602 | its PTID. */ | |
1603 | ||
1604 | static int | |
1605 | thread_db_find_thread_from_tid (struct thread_info *thread, void *data) | |
1606 | { | |
1607 | long *tid = (long *) data; | |
1608 | ||
1609 | if (thread->private->tid == *tid) | |
1610 | return 1; | |
1611 | ||
1612 | return 0; | |
1613 | } | |
1614 | ||
1615 | /* Implement the to_get_ada_task_ptid target method for this target. */ | |
1616 | ||
1617 | static ptid_t | |
1618 | thread_db_get_ada_task_ptid (long lwp, long thread) | |
1619 | { | |
1620 | struct thread_info *thread_info; | |
1621 | ||
d90e17a7 | 1622 | thread_db_find_new_threads_1 (inferior_ptid); |
0ef643c8 JB |
1623 | thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread); |
1624 | ||
1625 | gdb_assert (thread_info != NULL); | |
1626 | ||
1627 | return (thread_info->ptid); | |
1628 | } | |
1629 | ||
4d062f1a PA |
1630 | static void |
1631 | thread_db_resume (struct target_ops *ops, | |
1632 | ptid_t ptid, int step, enum target_signal signo) | |
1633 | { | |
1634 | struct target_ops *beneath = find_target_beneath (ops); | |
1635 | struct thread_db_info *info; | |
1636 | ||
1637 | if (ptid_equal (ptid, minus_one_ptid)) | |
1638 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
1639 | else | |
1640 | info = get_thread_db_info (GET_PID (ptid)); | |
1641 | ||
1642 | /* This workaround is only needed for child fork lwps stopped in a | |
1643 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1644 | workaround can be disabled. */ | |
1645 | if (info) | |
1646 | info->need_stale_parent_threads_check = 0; | |
1647 | ||
1648 | beneath->to_resume (beneath, ptid, step, signo); | |
1649 | } | |
1650 | ||
fb0e1ba7 MK |
1651 | static void |
1652 | init_thread_db_ops (void) | |
1653 | { | |
1654 | thread_db_ops.to_shortname = "multi-thread"; | |
1655 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1656 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
1657 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 1658 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 1659 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 1660 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
fb0e1ba7 MK |
1661 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
1662 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1663 | thread_db_ops.to_stratum = thread_stratum; | |
1664 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1665 | thread_db_ops.to_get_thread_local_address |
1666 | = thread_db_get_thread_local_address; | |
28b17333 | 1667 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 1668 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 MK |
1669 | thread_db_ops.to_magic = OPS_MAGIC; |
1670 | } | |
1671 | ||
2c0b251b PA |
1672 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1673 | extern initialize_file_ftype _initialize_thread_db; | |
1674 | ||
fb0e1ba7 MK |
1675 | void |
1676 | _initialize_thread_db (void) | |
1677 | { | |
17a37d48 PP |
1678 | init_thread_db_ops (); |
1679 | add_target (&thread_db_ops); | |
1680 | ||
1681 | /* Defer loading of libthread_db.so until inferior is running. | |
1682 | This allows gdb to load correct libthread_db for a given | |
1683 | executable -- there could be mutiple versions of glibc, | |
1684 | compiled with LinuxThreads or NPTL, and until there is | |
1685 | a running inferior, we can't tell which libthread_db is | |
1686 | the correct one to load. */ | |
1687 | ||
1688 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1689 | ||
1690 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1691 | class_support, | |
1692 | &libthread_db_search_path, _("\ | |
1693 | Set search path for libthread_db."), _("\ | |
1694 | Show the current search path or libthread_db."), _("\ | |
1695 | This path is used to search for libthread_db to be loaded into \ | |
1696 | gdb itself."), | |
1697 | NULL, | |
1698 | NULL, | |
1699 | &setlist, &showlist); | |
02d868e8 PP |
1700 | |
1701 | add_setshow_zinteger_cmd ("libthread-db", class_maintenance, | |
1702 | &libthread_db_debug, _("\ | |
1703 | Set libthread-db debugging."), _("\ | |
1704 | Show libthread-db debugging."), _("\ | |
1705 | When non-zero, libthread-db debugging is enabled."), | |
1706 | NULL, | |
1707 | show_libthread_db_debug, | |
1708 | &setdebuglist, &showdebuglist); | |
1709 | ||
17a37d48 PP |
1710 | /* Add ourselves to objfile event chain. */ |
1711 | observer_attach_new_objfile (thread_db_new_objfile); | |
fb0e1ba7 | 1712 | } |