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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
0b302171 | 3 | Copyright (C) 1999-2001, 2003-2012 Free Software Foundation, Inc. |
fb0e1ba7 MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
fb0e1ba7 MK |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
fb0e1ba7 MK |
19 | |
20 | #include "defs.h" | |
21 | ||
22 | #include "gdb_assert.h" | |
23 | #include <dlfcn.h> | |
24 | #include "gdb_proc_service.h" | |
25 | #include "gdb_thread_db.h" | |
26 | ||
bda9cb72 | 27 | #include "bfd.h" |
17a37d48 | 28 | #include "command.h" |
93ad78a7 | 29 | #include "exceptions.h" |
17a37d48 | 30 | #include "gdbcmd.h" |
fb0e1ba7 MK |
31 | #include "gdbthread.h" |
32 | #include "inferior.h" | |
bda9cb72 MK |
33 | #include "symfile.h" |
34 | #include "objfiles.h" | |
fb0e1ba7 | 35 | #include "target.h" |
4e052eda | 36 | #include "regcache.h" |
17a37d48 | 37 | #include "solib.h" |
3f47be5c | 38 | #include "solib-svr4.h" |
16451949 | 39 | #include "gdbcore.h" |
06d3b283 | 40 | #include "observer.h" |
0ec9a092 | 41 | #include "linux-nat.h" |
13da1c97 | 42 | #include "linux-procfs.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 | ||
84e578fb DE |
78 | static void |
79 | set_libthread_db_search_path (char *ignored, int from_tty, | |
80 | struct cmd_list_element *c) | |
81 | { | |
82 | if (*libthread_db_search_path == '\0') | |
83 | { | |
84 | xfree (libthread_db_search_path); | |
85 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
86 | } | |
87 | } | |
88 | ||
02d868e8 PP |
89 | /* If non-zero, print details of libthread_db processing. */ |
90 | ||
91 | static int libthread_db_debug; | |
92 | ||
93 | static void | |
94 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
95 | struct cmd_list_element *c, const char *value) | |
96 | { | |
97 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
98 | } | |
99 | ||
8605d56e AC |
100 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
101 | threads. */ | |
fb0e1ba7 | 102 | |
fb0e1ba7 MK |
103 | /* This module's target vector. */ |
104 | static struct target_ops thread_db_ops; | |
105 | ||
fb0e1ba7 MK |
106 | /* Non-zero if we have determined the signals used by the threads |
107 | library. */ | |
108 | static int thread_signals; | |
109 | static sigset_t thread_stop_set; | |
110 | static sigset_t thread_print_set; | |
111 | ||
d90e17a7 PA |
112 | struct thread_db_info |
113 | { | |
114 | struct thread_db_info *next; | |
115 | ||
116 | /* Process id this object refers to. */ | |
117 | int pid; | |
118 | ||
119 | /* Handle from dlopen for libthread_db.so. */ | |
120 | void *handle; | |
121 | ||
122 | /* Structure that identifies the child process for the | |
123 | <proc_service.h> interface. */ | |
124 | struct ps_prochandle proc_handle; | |
125 | ||
126 | /* Connection to the libthread_db library. */ | |
127 | td_thragent_t *thread_agent; | |
128 | ||
4d062f1a PA |
129 | /* True if we need to apply the workaround for glibc/BZ5983. When |
130 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
131 | list, nptl_db returns the parent's threads in addition to the new | |
132 | (single) child thread. If this flag is set, we do extra work to | |
133 | be able to ignore such stale entries. */ | |
134 | int need_stale_parent_threads_check; | |
135 | ||
d90e17a7 PA |
136 | /* Location of the thread creation event breakpoint. The code at |
137 | this location in the child process will be called by the pthread | |
138 | library whenever a new thread is created. By setting a special | |
139 | breakpoint at this location, GDB can detect when a new thread is | |
140 | created. We obtain this location via the td_ta_event_addr | |
141 | call. */ | |
142 | CORE_ADDR td_create_bp_addr; | |
fb0e1ba7 | 143 | |
d90e17a7 PA |
144 | /* Location of the thread death event breakpoint. */ |
145 | CORE_ADDR td_death_bp_addr; | |
fb0e1ba7 | 146 | |
d90e17a7 | 147 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 148 | |
d90e17a7 | 149 | td_err_e (*td_init_p) (void); |
fb0e1ba7 | 150 | |
d90e17a7 | 151 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
b4acd559 | 152 | td_thragent_t **ta); |
d90e17a7 PA |
153 | td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
154 | td_thrhandle_t *__th); | |
155 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, | |
156 | lwpid_t lwpid, td_thrhandle_t *th); | |
157 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
158 | td_thr_iter_f *callback, void *cbdata_p, | |
159 | td_thr_state_e state, int ti_pri, | |
160 | sigset_t *ti_sigmask_p, | |
161 | unsigned int ti_user_flags); | |
162 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
163 | td_event_e event, td_notify_t *ptr); | |
164 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
165 | td_thr_events_t *event); | |
21e1bee4 PP |
166 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
167 | td_thr_events_t *event); | |
d90e17a7 PA |
168 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
169 | td_event_msg_t *msg); | |
170 | ||
171 | td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
172 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
173 | td_thrinfo_t *infop); | |
174 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, | |
175 | int event); | |
176 | ||
177 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
178 | psaddr_t map_address, |
179 | size_t offset, psaddr_t *address); | |
d90e17a7 PA |
180 | }; |
181 | ||
182 | /* List of known processes using thread_db, and the required | |
183 | bookkeeping. */ | |
184 | struct thread_db_info *thread_db_list; | |
185 | ||
186 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 187 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 PA |
188 | |
189 | /* Add the current inferior to the list of processes using libpthread. | |
190 | Return a pointer to the newly allocated object that was added to | |
191 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
192 | LIBTHREAD_DB_SO. */ | |
193 | ||
194 | static struct thread_db_info * | |
195 | add_thread_db_info (void *handle) | |
196 | { | |
d90e17a7 PA |
197 | struct thread_db_info *info; |
198 | ||
199 | info = xcalloc (1, sizeof (*info)); | |
200 | info->pid = ptid_get_pid (inferior_ptid); | |
201 | info->handle = handle; | |
856d6f99 PA |
202 | |
203 | /* The workaround works by reading from /proc/pid/status, so it is | |
204 | disabled for core files. */ | |
205 | if (target_has_execution) | |
206 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
207 | |
208 | info->next = thread_db_list; | |
209 | thread_db_list = info; | |
210 | ||
211 | return info; | |
212 | } | |
213 | ||
214 | /* Return the thread_db_info object representing the bookkeeping | |
215 | related to process PID, if any; NULL otherwise. */ | |
216 | ||
217 | static struct thread_db_info * | |
218 | get_thread_db_info (int pid) | |
219 | { | |
220 | struct thread_db_info *info; | |
221 | ||
222 | for (info = thread_db_list; info; info = info->next) | |
223 | if (pid == info->pid) | |
224 | return info; | |
225 | ||
226 | return NULL; | |
227 | } | |
228 | ||
229 | /* When PID has exited or has been detached, we no longer want to keep | |
230 | track of it as using libpthread. Call this function to discard | |
231 | thread_db related info related to PID. Note that this closes | |
232 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
233 | ||
234 | static void | |
235 | delete_thread_db_info (int pid) | |
236 | { | |
237 | struct thread_db_info *info, *info_prev; | |
238 | ||
239 | info_prev = NULL; | |
240 | ||
241 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
242 | if (pid == info->pid) | |
243 | break; | |
244 | ||
245 | if (info == NULL) | |
246 | return; | |
247 | ||
248 | if (info->handle != NULL) | |
249 | dlclose (info->handle); | |
250 | ||
251 | if (info_prev) | |
252 | info_prev->next = info->next; | |
253 | else | |
254 | thread_db_list = info->next; | |
255 | ||
256 | xfree (info); | |
257 | } | |
fb0e1ba7 MK |
258 | |
259 | /* Prototypes for local functions. */ | |
02c6c942 PP |
260 | static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
261 | const td_thrinfo_t *ti_p); | |
17faa917 | 262 | static void detach_thread (ptid_t ptid); |
fb0e1ba7 MK |
263 | \f |
264 | ||
5365276c DJ |
265 | /* Use "struct private_thread_info" to cache thread state. This is |
266 | a substantial optimization. */ | |
267 | ||
fb0e1ba7 MK |
268 | struct private_thread_info |
269 | { | |
a2f23071 DJ |
270 | /* Flag set when we see a TD_DEATH event for this thread. */ |
271 | unsigned int dying:1; | |
272 | ||
5365276c | 273 | /* Cached thread state. */ |
5365276c | 274 | td_thrhandle_t th; |
17faa917 | 275 | thread_t tid; |
fb0e1ba7 | 276 | }; |
fb0e1ba7 | 277 | \f |
21bf60fe | 278 | |
fb0e1ba7 MK |
279 | static char * |
280 | thread_db_err_str (td_err_e err) | |
281 | { | |
282 | static char buf[64]; | |
283 | ||
284 | switch (err) | |
285 | { | |
286 | case TD_OK: | |
287 | return "generic 'call succeeded'"; | |
288 | case TD_ERR: | |
289 | return "generic error"; | |
290 | case TD_NOTHR: | |
291 | return "no thread to satisfy query"; | |
292 | case TD_NOSV: | |
293 | return "no sync handle to satisfy query"; | |
294 | case TD_NOLWP: | |
295 | return "no LWP to satisfy query"; | |
296 | case TD_BADPH: | |
297 | return "invalid process handle"; | |
298 | case TD_BADTH: | |
299 | return "invalid thread handle"; | |
300 | case TD_BADSH: | |
301 | return "invalid synchronization handle"; | |
302 | case TD_BADTA: | |
303 | return "invalid thread agent"; | |
304 | case TD_BADKEY: | |
305 | return "invalid key"; | |
306 | case TD_NOMSG: | |
307 | return "no event message for getmsg"; | |
308 | case TD_NOFPREGS: | |
309 | return "FPU register set not available"; | |
310 | case TD_NOLIBTHREAD: | |
311 | return "application not linked with libthread"; | |
312 | case TD_NOEVENT: | |
313 | return "requested event is not supported"; | |
314 | case TD_NOCAPAB: | |
315 | return "capability not available"; | |
316 | case TD_DBERR: | |
317 | return "debugger service failed"; | |
318 | case TD_NOAPLIC: | |
319 | return "operation not applicable to"; | |
320 | case TD_NOTSD: | |
321 | return "no thread-specific data for this thread"; | |
322 | case TD_MALLOC: | |
323 | return "malloc failed"; | |
324 | case TD_PARTIALREG: | |
325 | return "only part of register set was written/read"; | |
326 | case TD_NOXREGS: | |
327 | return "X register set not available for this thread"; | |
59f80f10 DJ |
328 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
329 | case TD_NOTALLOC: | |
330 | return "thread has not yet allocated TLS for given module"; | |
331 | #endif | |
332 | #ifdef THREAD_DB_HAS_TD_VERSION | |
333 | case TD_VERSION: | |
334 | return "versions of libpthread and libthread_db do not match"; | |
335 | #endif | |
336 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
337 | case TD_NOTLS: | |
338 | return "there is no TLS segment in the given module"; | |
339 | #endif | |
fb0e1ba7 MK |
340 | default: |
341 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
342 | return buf; | |
343 | } | |
344 | } | |
fb0e1ba7 | 345 | \f |
4105de34 DJ |
346 | /* Return 1 if any threads have been registered. There may be none if |
347 | the threading library is not fully initialized yet. */ | |
348 | ||
349 | static int | |
d90e17a7 | 350 | have_threads_callback (struct thread_info *thread, void *args) |
4105de34 | 351 | { |
d90e17a7 | 352 | int pid = * (int *) args; |
e0881a8e | 353 | |
d90e17a7 PA |
354 | if (ptid_get_pid (thread->ptid) != pid) |
355 | return 0; | |
356 | ||
e3bc4218 | 357 | return thread->private != NULL; |
4105de34 DJ |
358 | } |
359 | ||
360 | static int | |
d90e17a7 | 361 | have_threads (ptid_t ptid) |
4105de34 | 362 | { |
d90e17a7 PA |
363 | int pid = ptid_get_pid (ptid); |
364 | ||
365 | return iterate_over_threads (have_threads_callback, &pid) != NULL; | |
4105de34 DJ |
366 | } |
367 | ||
d90e17a7 PA |
368 | struct thread_get_info_inout |
369 | { | |
370 | struct thread_info *thread_info; | |
371 | struct thread_db_info *thread_db_info; | |
372 | }; | |
373 | ||
5365276c | 374 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 375 | threads to LWPs. |
5365276c DJ |
376 | |
377 | THP is a handle to the current thread; if INFOP is not NULL, the | |
378 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
379 | *INFOP. |
380 | ||
381 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
382 | zero is returned to indicate success. */ | |
5365276c DJ |
383 | |
384 | static int | |
d90e17a7 | 385 | thread_get_info_callback (const td_thrhandle_t *thp, void *argp) |
5365276c DJ |
386 | { |
387 | td_thrinfo_t ti; | |
388 | td_err_e err; | |
5365276c | 389 | ptid_t thread_ptid; |
d90e17a7 PA |
390 | struct thread_get_info_inout *inout; |
391 | struct thread_db_info *info; | |
392 | ||
393 | inout = argp; | |
394 | info = inout->thread_db_info; | |
5365276c | 395 | |
d90e17a7 | 396 | err = info->td_thr_get_info_p (thp, &ti); |
5365276c | 397 | if (err != TD_OK) |
8a3fe4f8 | 398 | error (_("thread_get_info_callback: cannot get thread info: %s"), |
5365276c DJ |
399 | thread_db_err_str (err)); |
400 | ||
401 | /* Fill the cache. */ | |
d90e17a7 | 402 | thread_ptid = ptid_build (info->pid, ti.ti_lid, 0); |
e09875d4 | 403 | inout->thread_info = find_thread_ptid (thread_ptid); |
5365276c | 404 | |
b9b5d7ea | 405 | /* In the case of a zombie thread, don't continue. We don't want to |
f90ef764 | 406 | attach to it thinking it is a new thread. */ |
b9b5d7ea | 407 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
d90e17a7 | 408 | return TD_THR_ZOMBIE; |
b9b5d7ea | 409 | |
d90e17a7 | 410 | if (inout->thread_info == NULL) |
5365276c DJ |
411 | { |
412 | /* New thread. Attach to it now (why wait?). */ | |
d90e17a7 PA |
413 | if (!have_threads (thread_ptid)) |
414 | thread_db_find_new_threads_1 (thread_ptid); | |
4c28f408 PA |
415 | else |
416 | attach_thread (thread_ptid, thp, &ti); | |
e09875d4 | 417 | inout->thread_info = find_thread_ptid (thread_ptid); |
d90e17a7 | 418 | gdb_assert (inout->thread_info != NULL); |
5365276c DJ |
419 | } |
420 | ||
5365276c DJ |
421 | return 0; |
422 | } | |
5365276c | 423 | \f |
fb0e1ba7 MK |
424 | /* Convert between user-level thread ids and LWP ids. */ |
425 | ||
39f77062 KB |
426 | static ptid_t |
427 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 | 428 | { |
fb0e1ba7 MK |
429 | td_thrhandle_t th; |
430 | td_err_e err; | |
d90e17a7 PA |
431 | struct thread_db_info *info; |
432 | struct thread_get_info_inout io = {0}; | |
fb0e1ba7 | 433 | |
6cb9b55b PP |
434 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
435 | th.th_unique = 0; | |
436 | ||
17faa917 DJ |
437 | /* This ptid comes from linux-nat.c, which should always fill in the |
438 | LWP. */ | |
439 | gdb_assert (GET_LWP (ptid) != 0); | |
fb0e1ba7 | 440 | |
d90e17a7 PA |
441 | info = get_thread_db_info (GET_PID (ptid)); |
442 | ||
4c28f408 | 443 | /* Access an lwp we know is stopped. */ |
d90e17a7 PA |
444 | info->proc_handle.ptid = ptid; |
445 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); | |
fb0e1ba7 | 446 | if (err != TD_OK) |
8a3fe4f8 | 447 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
39f77062 | 448 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 449 | |
b9b5d7ea JJ |
450 | /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the |
451 | event thread has already died. If another gdb interface has called | |
452 | thread_alive() previously, the thread won't be found on the thread list | |
453 | anymore. In that case, we don't want to process this ptid anymore | |
454 | to avoid the possibility of later treating it as a newly | |
455 | discovered thread id that we should add to the list. Thus, | |
456 | we return a -1 ptid which is also how the thread list marks a | |
457 | dead thread. */ | |
d90e17a7 PA |
458 | io.thread_db_info = info; |
459 | io.thread_info = NULL; | |
460 | if (thread_get_info_callback (&th, &io) == TD_THR_ZOMBIE | |
461 | && io.thread_info == NULL) | |
462 | return minus_one_ptid; | |
b9b5d7ea | 463 | |
17faa917 DJ |
464 | gdb_assert (ptid_get_tid (ptid) == 0); |
465 | return ptid; | |
fb0e1ba7 MK |
466 | } |
467 | \f | |
468 | ||
4c28f408 PA |
469 | /* Attach to lwp PTID, doing whatever else is required to have this |
470 | LWP under the debugger's control --- e.g., enabling event | |
471 | reporting. Returns true on success. */ | |
472 | int | |
473 | thread_db_attach_lwp (ptid_t ptid) | |
474 | { | |
475 | td_thrhandle_t th; | |
476 | td_thrinfo_t ti; | |
477 | td_err_e err; | |
d90e17a7 | 478 | struct thread_db_info *info; |
4c28f408 | 479 | |
d90e17a7 PA |
480 | info = get_thread_db_info (GET_PID (ptid)); |
481 | ||
482 | if (info == NULL) | |
4c28f408 PA |
483 | return 0; |
484 | ||
485 | /* This ptid comes from linux-nat.c, which should always fill in the | |
486 | LWP. */ | |
487 | gdb_assert (GET_LWP (ptid) != 0); | |
488 | ||
489 | /* Access an lwp we know is stopped. */ | |
d90e17a7 | 490 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
491 | |
492 | /* If we have only looked at the first thread before libpthread was | |
493 | initialized, we may not know its thread ID yet. Make sure we do | |
494 | before we add another thread to the list. */ | |
d90e17a7 PA |
495 | if (!have_threads (ptid)) |
496 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 497 | |
d90e17a7 | 498 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); |
4c28f408 PA |
499 | if (err != TD_OK) |
500 | /* Cannot find user-level thread. */ | |
501 | return 0; | |
502 | ||
d90e17a7 | 503 | err = info->td_thr_get_info_p (&th, &ti); |
4c28f408 PA |
504 | if (err != TD_OK) |
505 | { | |
506 | warning (_("Cannot get thread info: %s"), thread_db_err_str (err)); | |
507 | return 0; | |
508 | } | |
509 | ||
510 | attach_thread (ptid, &th, &ti); | |
511 | return 1; | |
512 | } | |
513 | ||
5220ea4c AC |
514 | static void * |
515 | verbose_dlsym (void *handle, const char *name) | |
516 | { | |
517 | void *sym = dlsym (handle, name); | |
518 | if (sym == NULL) | |
3e43a32a MS |
519 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
520 | name, dlerror ()); | |
5220ea4c AC |
521 | return sym; |
522 | } | |
523 | ||
cdbc0b18 | 524 | static td_err_e |
d90e17a7 | 525 | enable_thread_event (int event, CORE_ADDR *bp) |
24557e30 AC |
526 | { |
527 | td_notify_t notify; | |
cdbc0b18 | 528 | td_err_e err; |
d90e17a7 PA |
529 | struct thread_db_info *info; |
530 | ||
531 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
24557e30 | 532 | |
4c28f408 | 533 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 534 | info->proc_handle.ptid = inferior_ptid; |
4c28f408 | 535 | |
24557e30 | 536 | /* Get the breakpoint address for thread EVENT. */ |
d90e17a7 | 537 | err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify); |
24557e30 | 538 | if (err != TD_OK) |
cdbc0b18 | 539 | return err; |
24557e30 AC |
540 | |
541 | /* Set up the breakpoint. */ | |
16451949 AS |
542 | gdb_assert (exec_bfd); |
543 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
a97b0ac8 | 544 | (target_gdbarch, |
16451949 AS |
545 | /* Do proper sign extension for the target. */ |
546 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
547 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
548 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
549 | ¤t_target)); | |
a6d9a66e | 550 | create_thread_event_breakpoint (target_gdbarch, *bp); |
24557e30 | 551 | |
cdbc0b18 | 552 | return TD_OK; |
24557e30 AC |
553 | } |
554 | ||
fb0e1ba7 MK |
555 | static void |
556 | enable_thread_event_reporting (void) | |
557 | { | |
558 | td_thr_events_t events; | |
fb0e1ba7 | 559 | td_err_e err; |
a2f23071 DJ |
560 | #ifdef HAVE_GNU_LIBC_VERSION_H |
561 | const char *libc_version; | |
562 | int libc_major, libc_minor; | |
563 | #endif | |
d90e17a7 PA |
564 | struct thread_db_info *info; |
565 | ||
566 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
fb0e1ba7 MK |
567 | |
568 | /* We cannot use the thread event reporting facility if these | |
569 | functions aren't available. */ | |
d90e17a7 PA |
570 | if (info->td_ta_event_addr_p == NULL |
571 | || info->td_ta_set_event_p == NULL | |
572 | || info->td_ta_event_getmsg_p == NULL | |
573 | || info->td_thr_event_enable_p == NULL) | |
fb0e1ba7 MK |
574 | return; |
575 | ||
576 | /* Set the process wide mask saying which events we're interested in. */ | |
577 | td_event_emptyset (&events); | |
578 | td_event_addset (&events, TD_CREATE); | |
a2f23071 DJ |
579 | |
580 | #ifdef HAVE_GNU_LIBC_VERSION_H | |
34091d9b | 581 | /* The event reporting facility is broken for TD_DEATH events in |
2ef52e77 | 582 | glibc 2.1.3, so don't enable it if we have glibc but a lower |
34091d9b | 583 | version. */ |
a2f23071 DJ |
584 | libc_version = gnu_get_libc_version (); |
585 | if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 | |
586 | && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) | |
fb0e1ba7 | 587 | #endif |
a2f23071 | 588 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 | 589 | |
d90e17a7 | 590 | err = info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
591 | if (err != TD_OK) |
592 | { | |
8a3fe4f8 | 593 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
594 | thread_db_err_str (err)); |
595 | return; | |
596 | } | |
597 | ||
598 | /* Delete previous thread event breakpoints, if any. */ | |
599 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
600 | info->td_create_bp_addr = 0; |
601 | info->td_death_bp_addr = 0; | |
fb0e1ba7 | 602 | |
24557e30 | 603 | /* Set up the thread creation event. */ |
d90e17a7 | 604 | err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr); |
cdbc0b18 | 605 | if (err != TD_OK) |
fb0e1ba7 | 606 | { |
8a3fe4f8 | 607 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
608 | thread_db_err_str (err)); |
609 | return; | |
610 | } | |
611 | ||
24557e30 | 612 | /* Set up the thread death event. */ |
d90e17a7 | 613 | err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr); |
cdbc0b18 | 614 | if (err != TD_OK) |
fb0e1ba7 | 615 | { |
8a3fe4f8 | 616 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
617 | thread_db_err_str (err)); |
618 | return; | |
619 | } | |
fb0e1ba7 MK |
620 | } |
621 | ||
456b0e24 PP |
622 | /* Same as thread_db_find_new_threads_1, but silently ignore errors. */ |
623 | ||
624 | static void | |
625 | thread_db_find_new_threads_silently (ptid_t ptid) | |
626 | { | |
627 | volatile struct gdb_exception except; | |
628 | ||
629 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
630 | { | |
02c6c942 | 631 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
632 | } |
633 | ||
02d868e8 | 634 | if (except.reason < 0 && libthread_db_debug) |
e0881a8e MS |
635 | { |
636 | exception_fprintf (gdb_stderr, except, | |
637 | "Warning: thread_db_find_new_threads_silently: "); | |
638 | } | |
456b0e24 PP |
639 | } |
640 | ||
d90e17a7 PA |
641 | /* Lookup a library in which given symbol resides. |
642 | Note: this is looking in GDB process, not in the inferior. | |
643 | Returns library name, or NULL. */ | |
644 | ||
645 | static const char * | |
646 | dladdr_to_soname (const void *addr) | |
647 | { | |
648 | Dl_info info; | |
649 | ||
650 | if (dladdr (addr, &info) != 0) | |
651 | return info.dli_fname; | |
652 | return NULL; | |
653 | } | |
654 | ||
2471d008 | 655 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
656 | Return 1 on success. |
657 | Failure could happen if libthread_db does not have symbols we expect, | |
658 | or when it refuses to work with the current inferior (e.g. due to | |
659 | version mismatch between libthread_db and libpthread). */ | |
660 | ||
661 | static int | |
d90e17a7 | 662 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
663 | { |
664 | td_err_e err; | |
665 | ||
666 | /* Initialize pointers to the dynamic library functions we will use. | |
667 | Essential functions first. */ | |
668 | ||
d90e17a7 PA |
669 | info->td_init_p = verbose_dlsym (info->handle, "td_init"); |
670 | if (info->td_init_p == NULL) | |
17a37d48 PP |
671 | return 0; |
672 | ||
d90e17a7 | 673 | err = info->td_init_p (); |
17a37d48 PP |
674 | if (err != TD_OK) |
675 | { | |
3e43a32a MS |
676 | warning (_("Cannot initialize libthread_db: %s"), |
677 | thread_db_err_str (err)); | |
17a37d48 PP |
678 | return 0; |
679 | } | |
680 | ||
d90e17a7 PA |
681 | info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new"); |
682 | if (info->td_ta_new_p == NULL) | |
17a37d48 PP |
683 | return 0; |
684 | ||
685 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 686 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
687 | |
688 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 689 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
690 | if (err != TD_OK) |
691 | { | |
02d868e8 | 692 | if (libthread_db_debug) |
17a37d48 PP |
693 | printf_unfiltered (_("td_ta_new failed: %s\n"), |
694 | thread_db_err_str (err)); | |
695 | else | |
696 | switch (err) | |
697 | { | |
698 | case TD_NOLIBTHREAD: | |
699 | #ifdef THREAD_DB_HAS_TD_VERSION | |
700 | case TD_VERSION: | |
701 | #endif | |
702 | /* The errors above are not unexpected and silently ignored: | |
703 | they just mean we haven't found correct version of | |
704 | libthread_db yet. */ | |
705 | break; | |
706 | default: | |
707 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
708 | } | |
709 | return 0; | |
710 | } | |
711 | ||
d90e17a7 PA |
712 | info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr"); |
713 | if (info->td_ta_map_id2thr_p == NULL) | |
17a37d48 PP |
714 | return 0; |
715 | ||
3e43a32a MS |
716 | info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, |
717 | "td_ta_map_lwp2thr"); | |
d90e17a7 | 718 | if (info->td_ta_map_lwp2thr_p == NULL) |
17a37d48 PP |
719 | return 0; |
720 | ||
d90e17a7 PA |
721 | info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter"); |
722 | if (info->td_ta_thr_iter_p == NULL) | |
17a37d48 PP |
723 | return 0; |
724 | ||
d90e17a7 PA |
725 | info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate"); |
726 | if (info->td_thr_validate_p == NULL) | |
17a37d48 PP |
727 | return 0; |
728 | ||
d90e17a7 PA |
729 | info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info"); |
730 | if (info->td_thr_get_info_p == NULL) | |
17a37d48 PP |
731 | return 0; |
732 | ||
733 | /* These are not essential. */ | |
d90e17a7 PA |
734 | info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr"); |
735 | info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event"); | |
21e1bee4 | 736 | info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event"); |
d90e17a7 PA |
737 | info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); |
738 | info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); | |
739 | info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); | |
17a37d48 PP |
740 | |
741 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); | |
742 | ||
02d868e8 | 743 | if (libthread_db_debug || *libthread_db_search_path) |
d90e17a7 PA |
744 | { |
745 | const char *library; | |
17a37d48 | 746 | |
d90e17a7 PA |
747 | library = dladdr_to_soname (*info->td_ta_new_p); |
748 | if (library == NULL) | |
749 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 750 | |
d90e17a7 PA |
751 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
752 | library); | |
753 | } | |
17a37d48 | 754 | |
d90e17a7 PA |
755 | /* The thread library was detected. Activate the thread_db target |
756 | if this is the first process using it. */ | |
757 | if (thread_db_list->next == NULL) | |
758 | push_target (&thread_db_ops); | |
17a37d48 | 759 | |
856d6f99 PA |
760 | /* Enable event reporting, but not when debugging a core file. */ |
761 | if (target_has_execution) | |
762 | enable_thread_event_reporting (); | |
456b0e24 | 763 | |
099cb4fb | 764 | /* There appears to be a bug in glibc-2.3.6: calls to td_thr_get_info fail |
456b0e24 PP |
765 | with TD_ERR for statically linked executables if td_thr_get_info is |
766 | called before glibc has initialized itself. Silently ignore such | |
099cb4fb | 767 | errors, and let gdb enumerate threads again later. */ |
456b0e24 | 768 | thread_db_find_new_threads_silently (inferior_ptid); |
099cb4fb | 769 | |
d90e17a7 | 770 | return 1; |
17a37d48 PP |
771 | } |
772 | ||
773 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
774 | relative, or just LIBTHREAD_DB. */ | |
775 | ||
776 | static int | |
777 | try_thread_db_load (const char *library) | |
778 | { | |
779 | void *handle; | |
d90e17a7 | 780 | struct thread_db_info *info; |
17a37d48 | 781 | |
02d868e8 | 782 | if (libthread_db_debug) |
17a37d48 PP |
783 | printf_unfiltered (_("Trying host libthread_db library: %s.\n"), |
784 | library); | |
785 | handle = dlopen (library, RTLD_NOW); | |
786 | if (handle == NULL) | |
787 | { | |
02d868e8 | 788 | if (libthread_db_debug) |
17a37d48 PP |
789 | printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ()); |
790 | return 0; | |
791 | } | |
792 | ||
02d868e8 | 793 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
794 | { |
795 | void *td_init; | |
796 | ||
797 | td_init = dlsym (handle, "td_init"); | |
798 | if (td_init != NULL) | |
799 | { | |
800 | const char *const libpath = dladdr_to_soname (td_init); | |
801 | ||
802 | if (libpath != NULL) | |
803 | printf_unfiltered (_("Host %s resolved to: %s.\n"), | |
804 | library, libpath); | |
805 | } | |
806 | } | |
807 | ||
d90e17a7 PA |
808 | info = add_thread_db_info (handle); |
809 | ||
810 | if (try_thread_db_load_1 (info)) | |
17a37d48 PP |
811 | return 1; |
812 | ||
813 | /* This library "refused" to work on current inferior. */ | |
d90e17a7 | 814 | delete_thread_db_info (GET_PID (inferior_ptid)); |
17a37d48 PP |
815 | return 0; |
816 | } | |
817 | ||
290351b8 DE |
818 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
819 | Try loading libthread_db from the same directory as OBJ. | |
820 | The result is true for success. */ | |
821 | ||
822 | static int | |
823 | try_thread_db_load_from_pdir_1 (struct objfile *obj) | |
824 | { | |
05386e9e TT |
825 | struct cleanup *cleanup; |
826 | char *path, *cp; | |
827 | int result; | |
290351b8 | 828 | |
05386e9e | 829 | if (obj->name[0] != '/') |
290351b8 DE |
830 | { |
831 | warning (_("Expected absolute pathname for libpthread in the" | |
05386e9e | 832 | " inferior, but got %s."), obj->name); |
290351b8 DE |
833 | return 0; |
834 | } | |
05386e9e TT |
835 | |
836 | path = xmalloc (strlen (obj->name) + 1 + strlen (LIBTHREAD_DB_SO) + 1); | |
837 | cleanup = make_cleanup (xfree, path); | |
838 | ||
839 | strcpy (path, obj->name); | |
840 | cp = strrchr (path, '/'); | |
841 | /* This should at minimum hit the first character. */ | |
842 | gdb_assert (cp != NULL); | |
843 | strcpy (cp + 1, LIBTHREAD_DB_SO); | |
844 | result = try_thread_db_load (path); | |
845 | ||
846 | do_cleanups (cleanup); | |
847 | return result; | |
290351b8 DE |
848 | } |
849 | ||
98a5dd13 DE |
850 | /* Handle $pdir in libthread-db-search-path. |
851 | Look for libthread_db in the directory of libpthread. | |
852 | The result is true for success. */ | |
853 | ||
854 | static int | |
855 | try_thread_db_load_from_pdir (void) | |
856 | { | |
857 | struct objfile *obj; | |
858 | ||
859 | ALL_OBJFILES (obj) | |
860 | if (libpthread_name_p (obj->name)) | |
861 | { | |
290351b8 DE |
862 | if (try_thread_db_load_from_pdir_1 (obj)) |
863 | return 1; | |
864 | ||
865 | /* We may have found the separate-debug-info version of | |
866 | libpthread, and it may live in a directory without a matching | |
867 | libthread_db. */ | |
868 | if (obj->separate_debug_objfile_backlink != NULL) | |
869 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink); | |
870 | ||
98a5dd13 DE |
871 | return 0; |
872 | } | |
873 | ||
874 | return 0; | |
875 | } | |
876 | ||
877 | /* Handle $sdir in libthread-db-search-path. | |
878 | Look for libthread_db in the system dirs, or wherever a plain | |
879 | dlopen(file_without_path) will look. | |
880 | The result is true for success. */ | |
881 | ||
882 | static int | |
883 | try_thread_db_load_from_sdir (void) | |
884 | { | |
885 | return try_thread_db_load (LIBTHREAD_DB_SO); | |
886 | } | |
887 | ||
888 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
889 | The result is true for success. */ | |
890 | ||
891 | static int | |
892 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
893 | { | |
05386e9e TT |
894 | struct cleanup *cleanup; |
895 | char *path; | |
896 | int result; | |
98a5dd13 | 897 | |
05386e9e TT |
898 | path = xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
899 | cleanup = make_cleanup (xfree, path); | |
98a5dd13 DE |
900 | |
901 | memcpy (path, dir, dir_len); | |
902 | path[dir_len] = '/'; | |
903 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
05386e9e TT |
904 | result = try_thread_db_load (path); |
905 | ||
906 | do_cleanups (cleanup); | |
907 | return result; | |
98a5dd13 DE |
908 | } |
909 | ||
17a37d48 | 910 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
911 | to work on current inferior. |
912 | The result is true for success. */ | |
17a37d48 PP |
913 | |
914 | static int | |
915 | thread_db_load_search (void) | |
916 | { | |
17a37d48 PP |
917 | const char *search_path = libthread_db_search_path; |
918 | int rc = 0; | |
919 | ||
920 | while (*search_path) | |
921 | { | |
922 | const char *end = strchr (search_path, ':'); | |
98a5dd13 DE |
923 | const char *this_dir = search_path; |
924 | size_t this_dir_len; | |
e0881a8e | 925 | |
17a37d48 PP |
926 | if (end) |
927 | { | |
98a5dd13 DE |
928 | this_dir_len = end - search_path; |
929 | search_path += this_dir_len + 1; | |
17a37d48 PP |
930 | } |
931 | else | |
932 | { | |
98a5dd13 DE |
933 | this_dir_len = strlen (this_dir); |
934 | search_path += this_dir_len; | |
935 | } | |
17a37d48 | 936 | |
98a5dd13 DE |
937 | if (this_dir_len == sizeof ("$pdir") - 1 |
938 | && strncmp (this_dir, "$pdir", this_dir_len) == 0) | |
939 | { | |
940 | if (try_thread_db_load_from_pdir ()) | |
941 | { | |
942 | rc = 1; | |
943 | break; | |
944 | } | |
17a37d48 | 945 | } |
98a5dd13 DE |
946 | else if (this_dir_len == sizeof ("$sdir") - 1 |
947 | && strncmp (this_dir, "$sdir", this_dir_len) == 0) | |
948 | { | |
949 | if (try_thread_db_load_from_sdir ()) | |
950 | { | |
951 | rc = 1; | |
952 | break; | |
953 | } | |
954 | } | |
955 | else | |
17a37d48 | 956 | { |
98a5dd13 DE |
957 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
958 | { | |
959 | rc = 1; | |
960 | break; | |
961 | } | |
17a37d48 PP |
962 | } |
963 | } | |
98a5dd13 DE |
964 | |
965 | if (libthread_db_debug) | |
966 | printf_unfiltered (_("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
967 | return rc; |
968 | } | |
969 | ||
98a5dd13 DE |
970 | /* Return non-zero if the inferior has a libpthread. */ |
971 | ||
972 | static int | |
973 | has_libpthread (void) | |
974 | { | |
975 | struct objfile *obj; | |
976 | ||
977 | ALL_OBJFILES (obj) | |
978 | if (libpthread_name_p (obj->name)) | |
979 | return 1; | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
17a37d48 | 984 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 985 | Return 1 on success. */ |
17a37d48 PP |
986 | |
987 | static int | |
988 | thread_db_load (void) | |
989 | { | |
d90e17a7 | 990 | struct thread_db_info *info; |
17a37d48 | 991 | |
d90e17a7 PA |
992 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
993 | ||
994 | if (info != NULL) | |
17a37d48 PP |
995 | return 1; |
996 | ||
856d6f99 PA |
997 | /* Don't attempt to use thread_db on executables not running |
998 | yet. */ | |
999 | if (!target_has_registers) | |
17a37d48 PP |
1000 | return 0; |
1001 | ||
1002 | /* Don't attempt to use thread_db for remote targets. */ | |
856d6f99 | 1003 | if (!(target_can_run (¤t_target) || core_bfd)) |
17a37d48 PP |
1004 | return 0; |
1005 | ||
1006 | if (thread_db_load_search ()) | |
1007 | return 1; | |
1008 | ||
98a5dd13 DE |
1009 | /* We couldn't find a libthread_db. |
1010 | If the inferior has a libpthread warn the user. */ | |
1011 | if (has_libpthread ()) | |
1012 | { | |
1013 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1014 | " library, thread debugging will not be available.")); | |
1015 | return 0; | |
17a37d48 | 1016 | } |
98a5dd13 | 1017 | |
17a37d48 PP |
1018 | /* Either this executable isn't using libpthread at all, or it is |
1019 | statically linked. Since we can't easily distinguish these two cases, | |
1020 | no warning is issued. */ | |
1021 | return 0; | |
1022 | } | |
1023 | ||
fb0e1ba7 | 1024 | static void |
12b6a110 | 1025 | disable_thread_event_reporting (struct thread_db_info *info) |
fb0e1ba7 | 1026 | { |
21e1bee4 | 1027 | if (info->td_ta_clear_event_p != NULL) |
12b6a110 PP |
1028 | { |
1029 | td_thr_events_t events; | |
fb0e1ba7 | 1030 | |
12b6a110 PP |
1031 | /* Set the process wide mask saying we aren't interested in any |
1032 | events anymore. */ | |
21e1bee4 PP |
1033 | td_event_fillset (&events); |
1034 | info->td_ta_clear_event_p (info->thread_agent, &events); | |
12b6a110 | 1035 | } |
fb0e1ba7 | 1036 | |
d90e17a7 PA |
1037 | info->td_create_bp_addr = 0; |
1038 | info->td_death_bp_addr = 0; | |
fb0e1ba7 MK |
1039 | } |
1040 | ||
1041 | static void | |
1042 | check_thread_signals (void) | |
1043 | { | |
21bf60fe | 1044 | if (!thread_signals) |
fb0e1ba7 MK |
1045 | { |
1046 | sigset_t mask; | |
1047 | int i; | |
1048 | ||
669211f5 | 1049 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1050 | sigemptyset (&thread_stop_set); |
1051 | sigemptyset (&thread_print_set); | |
1052 | ||
b9569773 | 1053 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1054 | { |
1055 | if (sigismember (&mask, i)) | |
1056 | { | |
1057 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
1058 | sigaddset (&thread_stop_set, i); | |
1059 | if (signal_print_update (target_signal_from_host (i), 0)) | |
1060 | sigaddset (&thread_print_set, i); | |
1061 | thread_signals = 1; | |
1062 | } | |
1063 | } | |
1064 | } | |
fb0e1ba7 MK |
1065 | } |
1066 | ||
0ec9a092 DJ |
1067 | /* Check whether thread_db is usable. This function is called when |
1068 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1069 | and when new shared libraries are loaded into a running process. */ | |
1070 | ||
1071 | void | |
1072 | check_for_thread_db (void) | |
fb0e1ba7 | 1073 | { |
b5057acd | 1074 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1075 | if (!thread_db_load ()) |
b5057acd | 1076 | return; |
0ec9a092 DJ |
1077 | } |
1078 | ||
0838fb57 DE |
1079 | /* This function is called via the new_objfile observer. */ |
1080 | ||
0ec9a092 DJ |
1081 | static void |
1082 | thread_db_new_objfile (struct objfile *objfile) | |
1083 | { | |
d90e17a7 PA |
1084 | /* This observer must always be called with inferior_ptid set |
1085 | correctly. */ | |
1086 | ||
0838fb57 DE |
1087 | if (objfile != NULL |
1088 | /* Only check for thread_db if we loaded libpthread, | |
1089 | or if this is the main symbol file. | |
1090 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1091 | a statically linked executable AND the symbol file is specified AFTER | |
1092 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1093 | For dynamically linked executables, libpthread can be near the end | |
1094 | of the list of shared libraries to load, and in an app of several | |
1095 | thousand shared libraries, this can otherwise be painful. */ | |
1096 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
1097 | || libpthread_name_p (objfile->name))) | |
0ec9a092 | 1098 | check_for_thread_db (); |
fb0e1ba7 MK |
1099 | } |
1100 | ||
0838fb57 DE |
1101 | /* This function is called via the inferior_created observer. |
1102 | This handles the case of debugging statically linked executables. */ | |
1103 | ||
1104 | static void | |
1105 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1106 | { | |
1107 | check_for_thread_db (); | |
1108 | } | |
1109 | ||
a2f23071 DJ |
1110 | /* Attach to a new thread. This function is called when we receive a |
1111 | TD_CREATE event or when we iterate over all threads and find one | |
02c6c942 | 1112 | that wasn't already in our list. Returns true on success. */ |
a2f23071 | 1113 | |
02c6c942 | 1114 | static int |
39f77062 | 1115 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 1116 | const td_thrinfo_t *ti_p) |
fb0e1ba7 | 1117 | { |
17faa917 DJ |
1118 | struct private_thread_info *private; |
1119 | struct thread_info *tp = NULL; | |
fb0e1ba7 | 1120 | td_err_e err; |
d90e17a7 | 1121 | struct thread_db_info *info; |
fb0e1ba7 | 1122 | |
a2f23071 DJ |
1123 | /* If we're being called after a TD_CREATE event, we may already |
1124 | know about this thread. There are two ways this can happen. We | |
1125 | may have iterated over all threads between the thread creation | |
1126 | and the TD_CREATE event, for instance when the user has issued | |
1127 | the `info threads' command before the SIGTRAP for hitting the | |
1128 | thread creation breakpoint was reported. Alternatively, the | |
1129 | thread may have exited and a new one been created with the same | |
1130 | thread ID. In the first case we don't need to do anything; in | |
1131 | the second case we should discard information about the dead | |
1132 | thread and attach to the new one. */ | |
1133 | if (in_thread_list (ptid)) | |
1134 | { | |
e09875d4 | 1135 | tp = find_thread_ptid (ptid); |
a2f23071 DJ |
1136 | gdb_assert (tp != NULL); |
1137 | ||
17faa917 DJ |
1138 | /* If tp->private is NULL, then GDB is already attached to this |
1139 | thread, but we do not know anything about it. We can learn | |
1140 | about it here. This can only happen if we have some other | |
1141 | way besides libthread_db to notice new threads (i.e. | |
1142 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread | |
1143 | exit, so this can not be a stale thread recreated with the | |
1144 | same ID. */ | |
1145 | if (tp->private != NULL) | |
1146 | { | |
1147 | if (!tp->private->dying) | |
02c6c942 | 1148 | return 0; |
a2f23071 | 1149 | |
17faa917 DJ |
1150 | delete_thread (ptid); |
1151 | tp = NULL; | |
1152 | } | |
a2f23071 DJ |
1153 | } |
1154 | ||
856d6f99 PA |
1155 | if (target_has_execution) |
1156 | check_thread_signals (); | |
fb0e1ba7 | 1157 | |
9ee57c33 | 1158 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
02c6c942 | 1159 | return 0; /* A zombie thread -- do not attach. */ |
9ee57c33 DJ |
1160 | |
1161 | /* Under GNU/Linux, we have to attach to each and every thread. */ | |
856d6f99 | 1162 | if (target_has_execution |
84636d28 PA |
1163 | && tp == NULL) |
1164 | { | |
1165 | int res; | |
1166 | ||
1167 | res = lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid))); | |
1168 | if (res < 0) | |
1169 | { | |
1170 | /* Error, stop iterating. */ | |
1171 | return 0; | |
1172 | } | |
1173 | else if (res > 0) | |
1174 | { | |
1175 | /* Pretend this thread doesn't exist yet, and keep | |
1176 | iterating. */ | |
1177 | return 1; | |
1178 | } | |
1179 | ||
1180 | /* Otherwise, we sucessfully attached to the thread. */ | |
1181 | } | |
9ee57c33 | 1182 | |
17faa917 DJ |
1183 | /* Construct the thread's private data. */ |
1184 | private = xmalloc (sizeof (struct private_thread_info)); | |
1185 | memset (private, 0, sizeof (struct private_thread_info)); | |
1186 | ||
1187 | /* A thread ID of zero may mean the thread library has not initialized | |
1188 | yet. But we shouldn't even get here if that's the case. FIXME: | |
1189 | if we change GDB to always have at least one thread in the thread | |
1190 | list this will have to go somewhere else; maybe private == NULL | |
1191 | until the thread_db target claims it. */ | |
1192 | gdb_assert (ti_p->ti_tid != 0); | |
1193 | private->th = *th_p; | |
1194 | private->tid = ti_p->ti_tid; | |
1195 | ||
fb0e1ba7 | 1196 | /* Add the thread to GDB's thread list. */ |
17faa917 | 1197 | if (tp == NULL) |
2e456570 | 1198 | add_thread_with_info (ptid, private); |
17faa917 DJ |
1199 | else |
1200 | tp->private = private; | |
5365276c | 1201 | |
d90e17a7 PA |
1202 | info = get_thread_db_info (GET_PID (ptid)); |
1203 | ||
856d6f99 PA |
1204 | /* Enable thread event reporting for this thread, except when |
1205 | debugging a core file. */ | |
1206 | if (target_has_execution) | |
1207 | { | |
1208 | err = info->td_thr_event_enable_p (th_p, 1); | |
1209 | if (err != TD_OK) | |
1210 | error (_("Cannot enable thread event reporting for %s: %s"), | |
1211 | target_pid_to_str (ptid), thread_db_err_str (err)); | |
1212 | } | |
1213 | ||
02c6c942 | 1214 | return 1; |
fb0e1ba7 MK |
1215 | } |
1216 | ||
1217 | static void | |
17faa917 | 1218 | detach_thread (ptid_t ptid) |
fb0e1ba7 | 1219 | { |
a2f23071 DJ |
1220 | struct thread_info *thread_info; |
1221 | ||
a2f23071 DJ |
1222 | /* Don't delete the thread now, because it still reports as active |
1223 | until it has executed a few instructions after the event | |
1224 | breakpoint - if we deleted it now, "info threads" would cause us | |
1225 | to re-attach to it. Just mark it as having had a TD_DEATH | |
1226 | event. This means that we won't delete it from our thread list | |
1227 | until we notice that it's dead (via prune_threads), or until | |
17faa917 DJ |
1228 | something re-uses its thread ID. We'll report the thread exit |
1229 | when the underlying LWP dies. */ | |
e09875d4 | 1230 | thread_info = find_thread_ptid (ptid); |
17faa917 | 1231 | gdb_assert (thread_info != NULL && thread_info->private != NULL); |
a2f23071 | 1232 | thread_info->private->dying = 1; |
fb0e1ba7 MK |
1233 | } |
1234 | ||
1235 | static void | |
136d6dae | 1236 | thread_db_detach (struct target_ops *ops, char *args, int from_tty) |
fb0e1ba7 | 1237 | { |
117de6a9 | 1238 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1239 | struct thread_db_info *info; |
117de6a9 | 1240 | |
d90e17a7 | 1241 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
c194fbe1 | 1242 | |
d90e17a7 PA |
1243 | if (info) |
1244 | { | |
856d6f99 PA |
1245 | if (target_has_execution) |
1246 | { | |
1247 | disable_thread_event_reporting (info); | |
1248 | ||
1249 | /* Delete the old thread event breakpoints. Note that | |
1250 | unlike when mourning, we can remove them here because | |
1251 | there's still a live inferior to poke at. In any case, | |
1252 | GDB will not try to insert anything in the inferior when | |
1253 | removing a breakpoint. */ | |
1254 | remove_thread_event_breakpoints (); | |
1255 | } | |
d90e17a7 PA |
1256 | |
1257 | delete_thread_db_info (GET_PID (inferior_ptid)); | |
1258 | } | |
4105de34 | 1259 | |
7a7d3353 | 1260 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1261 | |
1262 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1263 | ||
1264 | /* If there are no more processes using libpthread, detach the | |
1265 | thread_db target ops. */ | |
1266 | if (!thread_db_list) | |
1267 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1268 | } |
1269 | ||
fb0e1ba7 MK |
1270 | /* Check if PID is currently stopped at the location of a thread event |
1271 | breakpoint location. If it is, read the event message and act upon | |
1272 | the event. */ | |
1273 | ||
1274 | static void | |
39f77062 | 1275 | check_event (ptid_t ptid) |
fb0e1ba7 | 1276 | { |
515630c5 UW |
1277 | struct regcache *regcache = get_thread_regcache (ptid); |
1278 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
fb0e1ba7 MK |
1279 | td_event_msg_t msg; |
1280 | td_thrinfo_t ti; | |
1281 | td_err_e err; | |
1282 | CORE_ADDR stop_pc; | |
4d9850d3 | 1283 | int loop = 0; |
d90e17a7 PA |
1284 | struct thread_db_info *info; |
1285 | ||
1286 | info = get_thread_db_info (GET_PID (ptid)); | |
fb0e1ba7 MK |
1287 | |
1288 | /* Bail out early if we're not at a thread event breakpoint. */ | |
515630c5 UW |
1289 | stop_pc = regcache_read_pc (regcache) |
1290 | - gdbarch_decr_pc_after_break (gdbarch); | |
d90e17a7 PA |
1291 | if (stop_pc != info->td_create_bp_addr |
1292 | && stop_pc != info->td_death_bp_addr) | |
fb0e1ba7 MK |
1293 | return; |
1294 | ||
4c28f408 | 1295 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1296 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
1297 | |
1298 | /* If we have only looked at the first thread before libpthread was | |
1299 | initialized, we may not know its thread ID yet. Make sure we do | |
1300 | before we add another thread to the list. */ | |
d90e17a7 PA |
1301 | if (!have_threads (ptid)) |
1302 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 1303 | |
4d9850d3 JJ |
1304 | /* If we are at a create breakpoint, we do not know what new lwp |
1305 | was created and cannot specifically locate the event message for it. | |
1306 | We have to call td_ta_event_getmsg() to get | |
1307 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 1308 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 1309 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
1310 | This guarantees we will process the correct message before continuing |
1311 | from the breakpoint. | |
4d9850d3 JJ |
1312 | |
1313 | Currently, death events are not enabled. If they are enabled, | |
1314 | the death event can use the td_thr_event_getmsg() interface to | |
1315 | get the message specifically for that lwp and avoid looping | |
1316 | below. */ | |
1317 | ||
1318 | loop = 1; | |
1319 | ||
1320 | do | |
fb0e1ba7 | 1321 | { |
d90e17a7 | 1322 | err = info->td_ta_event_getmsg_p (info->thread_agent, &msg); |
4d9850d3 JJ |
1323 | if (err != TD_OK) |
1324 | { | |
1325 | if (err == TD_NOMSG) | |
1326 | return; | |
fb0e1ba7 | 1327 | |
8a3fe4f8 | 1328 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
1329 | thread_db_err_str (err)); |
1330 | } | |
fb0e1ba7 | 1331 | |
d90e17a7 | 1332 | err = info->td_thr_get_info_p (msg.th_p, &ti); |
4d9850d3 | 1333 | if (err != TD_OK) |
8a3fe4f8 | 1334 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 1335 | |
17faa917 | 1336 | ptid = ptid_build (GET_PID (ptid), ti.ti_lid, 0); |
fb0e1ba7 | 1337 | |
4d9850d3 JJ |
1338 | switch (msg.event) |
1339 | { | |
1340 | case TD_CREATE: | |
a2f23071 DJ |
1341 | /* Call attach_thread whether or not we already know about a |
1342 | thread with this thread ID. */ | |
93815fbf | 1343 | attach_thread (ptid, msg.th_p, &ti); |
fb0e1ba7 | 1344 | |
4d9850d3 | 1345 | break; |
fb0e1ba7 | 1346 | |
4d9850d3 | 1347 | case TD_DEATH: |
fb0e1ba7 | 1348 | |
4d9850d3 | 1349 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 1350 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 1351 | |
17faa917 | 1352 | detach_thread (ptid); |
fb0e1ba7 | 1353 | |
4d9850d3 | 1354 | break; |
fb0e1ba7 | 1355 | |
4d9850d3 | 1356 | default: |
8a3fe4f8 | 1357 | error (_("Spurious thread event.")); |
4d9850d3 | 1358 | } |
fb0e1ba7 | 1359 | } |
4d9850d3 | 1360 | while (loop); |
fb0e1ba7 MK |
1361 | } |
1362 | ||
39f77062 | 1363 | static ptid_t |
117de6a9 | 1364 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1365 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1366 | int options) | |
fb0e1ba7 | 1367 | { |
d90e17a7 | 1368 | struct thread_db_info *info; |
117de6a9 PA |
1369 | struct target_ops *beneath = find_target_beneath (ops); |
1370 | ||
47608cb1 | 1371 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1372 | |
b84876c2 PA |
1373 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1374 | return ptid; | |
1375 | ||
1111f4aa | 1376 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1377 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1378 | return ptid; | |
fb0e1ba7 | 1379 | |
d90e17a7 PA |
1380 | info = get_thread_db_info (GET_PID (ptid)); |
1381 | ||
1382 | /* If this process isn't using thread_db, we're done. */ | |
1383 | if (info == NULL) | |
1384 | return ptid; | |
1385 | ||
3f64f7b1 DJ |
1386 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1387 | { | |
d90e17a7 PA |
1388 | /* New image, it may or may not end up using thread_db. Assume |
1389 | not unless we find otherwise. */ | |
1390 | delete_thread_db_info (GET_PID (ptid)); | |
1391 | if (!thread_db_list) | |
1392 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1393 | |
6c95b8df PA |
1394 | /* Thread event breakpoints are deleted by |
1395 | update_breakpoints_after_exec. */ | |
1396 | ||
49fd4a42 | 1397 | return ptid; |
3f64f7b1 DJ |
1398 | } |
1399 | ||
4105de34 DJ |
1400 | /* If we do not know about the main thread yet, this would be a good time to |
1401 | find it. */ | |
d90e17a7 PA |
1402 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid)) |
1403 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1404 | |
fb0e1ba7 MK |
1405 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
1406 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
1407 | /* Check for a thread event. */ | |
39f77062 | 1408 | check_event (ptid); |
fb0e1ba7 | 1409 | |
d90e17a7 | 1410 | if (have_threads (ptid)) |
4105de34 DJ |
1411 | { |
1412 | /* Change ptids back into the higher level PID + TID format. If | |
1413 | the thread is dead and no longer on the thread list, we will | |
1414 | get back a dead ptid. This can occur if the thread death | |
1415 | event gets postponed by other simultaneous events. In such a | |
1416 | case, we want to just ignore the event and continue on. */ | |
1417 | ||
4105de34 DJ |
1418 | ptid = thread_from_lwp (ptid); |
1419 | if (GET_PID (ptid) == -1) | |
1420 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
1421 | } | |
fb0e1ba7 | 1422 | |
b9b5d7ea | 1423 | return ptid; |
fb0e1ba7 MK |
1424 | } |
1425 | ||
fb0e1ba7 | 1426 | static void |
136d6dae | 1427 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1428 | { |
117de6a9 PA |
1429 | struct target_ops *target_beneath = find_target_beneath (ops); |
1430 | ||
d90e17a7 | 1431 | delete_thread_db_info (GET_PID (inferior_ptid)); |
fb0e1ba7 | 1432 | |
d90e17a7 PA |
1433 | target_beneath->to_mourn_inferior (target_beneath); |
1434 | ||
6c95b8df PA |
1435 | /* Delete the old thread event breakpoints. Do this after mourning |
1436 | the inferior, so that we don't try to uninsert them. */ | |
1437 | remove_thread_event_breakpoints (); | |
1438 | ||
b26a6851 | 1439 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1440 | if (!thread_db_list) |
1441 | unpush_target (ops); | |
fb0e1ba7 MK |
1442 | } |
1443 | ||
02c6c942 PP |
1444 | struct callback_data |
1445 | { | |
1446 | struct thread_db_info *info; | |
1447 | int new_threads; | |
1448 | }; | |
1449 | ||
fb0e1ba7 MK |
1450 | static int |
1451 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1452 | { | |
1453 | td_thrinfo_t ti; | |
1454 | td_err_e err; | |
39f77062 | 1455 | ptid_t ptid; |
403fe197 | 1456 | struct thread_info *tp; |
02c6c942 PP |
1457 | struct callback_data *cb_data = data; |
1458 | struct thread_db_info *info = cb_data->info; | |
fb0e1ba7 | 1459 | |
d90e17a7 | 1460 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1461 | if (err != TD_OK) |
8a3fe4f8 | 1462 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1463 | thread_db_err_str (err)); |
fb0e1ba7 | 1464 | |
21bf60fe MK |
1465 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
1466 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 1467 | |
254f582e | 1468 | if (ti.ti_tid == 0) |
4105de34 DJ |
1469 | { |
1470 | /* A thread ID of zero means that this is the main thread, but | |
1471 | glibc has not yet initialized thread-local storage and the | |
1472 | pthread library. We do not know what the thread's TID will | |
1473 | be yet. Just enable event reporting and otherwise ignore | |
1474 | it. */ | |
1475 | ||
4d062f1a PA |
1476 | /* In that case, we're not stopped in a fork syscall and don't |
1477 | need this glibc bug workaround. */ | |
1478 | info->need_stale_parent_threads_check = 0; | |
1479 | ||
254f582e JK |
1480 | if (target_has_execution) |
1481 | { | |
1482 | err = info->td_thr_event_enable_p (th_p, 1); | |
1483 | if (err != TD_OK) | |
1484 | error (_("Cannot enable thread event reporting for LWP %d: %s"), | |
1485 | (int) ti.ti_lid, thread_db_err_str (err)); | |
1486 | } | |
4105de34 DJ |
1487 | |
1488 | return 0; | |
1489 | } | |
1490 | ||
4d062f1a PA |
1491 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1492 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1493 | avoid doing the work if we know we don't have to. */ | |
1494 | if (info->need_stale_parent_threads_check) | |
1495 | { | |
1496 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1497 | |
4d062f1a PA |
1498 | if (tgid != -1 && tgid != info->pid) |
1499 | return 0; | |
1500 | } | |
1501 | ||
1502 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1503 | tp = find_thread_ptid (ptid); |
403fe197 | 1504 | if (tp == NULL || tp->private == NULL) |
02c6c942 PP |
1505 | { |
1506 | if (attach_thread (ptid, th_p, &ti)) | |
1507 | cb_data->new_threads += 1; | |
1508 | else | |
1509 | /* Problem attaching this thread; perhaps it exited before we | |
1510 | could attach it? | |
1511 | This could mean that the thread list inside glibc itself is in | |
1512 | inconsistent state, and libthread_db could go on looping forever | |
1513 | (observed with glibc-2.3.6). To prevent that, terminate | |
1514 | iteration: thread_db_find_new_threads_2 will retry. */ | |
1515 | return 1; | |
1516 | } | |
fb0e1ba7 MK |
1517 | |
1518 | return 0; | |
1519 | } | |
1520 | ||
02c6c942 PP |
1521 | /* Helper for thread_db_find_new_threads_2. |
1522 | Returns number of new threads found. */ | |
1523 | ||
1524 | static int | |
1525 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1526 | td_err_e *errp) |
02c6c942 PP |
1527 | { |
1528 | volatile struct gdb_exception except; | |
1529 | struct callback_data data; | |
fb169834 | 1530 | td_err_e err = TD_ERR; |
02c6c942 PP |
1531 | |
1532 | data.info = info; | |
1533 | data.new_threads = 0; | |
1534 | ||
1535 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
1536 | { | |
1537 | /* Iterate over all user-space threads to discover new threads. */ | |
1538 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1539 | find_new_threads_callback, | |
1540 | &data, | |
1541 | TD_THR_ANY_STATE, | |
1542 | TD_THR_LOWEST_PRIORITY, | |
1543 | TD_SIGNO_MASK, | |
1544 | TD_THR_ANY_USER_FLAGS); | |
1545 | } | |
1546 | ||
02d868e8 | 1547 | if (libthread_db_debug) |
02c6c942 PP |
1548 | { |
1549 | if (except.reason < 0) | |
1550 | exception_fprintf (gdb_stderr, except, | |
1551 | "Warning: find_new_threads_once: "); | |
1552 | ||
1553 | printf_filtered (_("Found %d new threads in iteration %d.\n"), | |
1554 | data.new_threads, iteration); | |
1555 | } | |
1556 | ||
1557 | if (errp != NULL) | |
1558 | *errp = err; | |
1559 | ||
1560 | return data.new_threads; | |
1561 | } | |
1562 | ||
4c28f408 | 1563 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1564 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1565 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1566 | |
fb0e1ba7 | 1567 | static void |
02c6c942 | 1568 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 MK |
1569 | { |
1570 | td_err_e err; | |
d90e17a7 PA |
1571 | struct thread_db_info *info; |
1572 | int pid = ptid_get_pid (ptid); | |
02c6c942 | 1573 | int i, loop; |
4c28f408 | 1574 | |
d90e17a7 PA |
1575 | info = get_thread_db_info (GET_PID (ptid)); |
1576 | ||
4c28f408 | 1577 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1578 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1579 | |
1580 | if (until_no_new) | |
1581 | { | |
1582 | /* Require 4 successive iterations which do not find any new threads. | |
1583 | The 4 is a heuristic: there is an inherent race here, and I have | |
1584 | seen that 2 iterations in a row are not always sufficient to | |
1585 | "capture" all threads. */ | |
1586 | for (i = 0, loop = 0; loop < 4; ++i, ++loop) | |
1587 | if (find_new_threads_once (info, i, NULL) != 0) | |
1588 | /* Found some new threads. Restart the loop from beginning. */ | |
1589 | loop = -1; | |
1590 | } | |
1591 | else | |
1592 | { | |
02c6c942 PP |
1593 | find_new_threads_once (info, 0, &err); |
1594 | if (err != TD_OK) | |
1595 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
1596 | } | |
fb0e1ba7 MK |
1597 | } |
1598 | ||
02c6c942 PP |
1599 | static void |
1600 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1601 | { | |
1602 | thread_db_find_new_threads_2 (ptid, 0); | |
1603 | } | |
1604 | ||
dc146f7c VP |
1605 | static int |
1606 | update_thread_core (struct lwp_info *info, void *closure) | |
1607 | { | |
1608 | info->core = linux_nat_core_of_thread_1 (info->ptid); | |
1609 | return 0; | |
1610 | } | |
02c6c942 | 1611 | |
28439f5e PA |
1612 | static void |
1613 | thread_db_find_new_threads (struct target_ops *ops) | |
1614 | { | |
d90e17a7 | 1615 | struct thread_db_info *info; |
c65b3e0d | 1616 | struct inferior *inf; |
d90e17a7 | 1617 | |
c65b3e0d PA |
1618 | ALL_INFERIORS (inf) |
1619 | { | |
1620 | struct thread_info *thread; | |
d90e17a7 | 1621 | |
c65b3e0d PA |
1622 | if (inf->pid == 0) |
1623 | continue; | |
d90e17a7 | 1624 | |
c65b3e0d PA |
1625 | info = get_thread_db_info (inf->pid); |
1626 | if (info == NULL) | |
1627 | continue; | |
1628 | ||
1629 | thread = any_live_thread_of_process (inf->pid); | |
1630 | if (thread == NULL || thread->executing) | |
1631 | continue; | |
1632 | ||
1633 | thread_db_find_new_threads_1 (thread->ptid); | |
1634 | } | |
dc146f7c | 1635 | |
856d6f99 PA |
1636 | if (target_has_execution) |
1637 | iterate_over_lwps (minus_one_ptid /* iterate over all */, | |
1638 | update_thread_core, NULL); | |
28439f5e PA |
1639 | } |
1640 | ||
fb0e1ba7 | 1641 | static char * |
117de6a9 | 1642 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1643 | { |
e09875d4 | 1644 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1645 | struct target_ops *beneath; |
17faa917 DJ |
1646 | |
1647 | if (thread_info != NULL && thread_info->private != NULL) | |
fb0e1ba7 MK |
1648 | { |
1649 | static char buf[64]; | |
17faa917 | 1650 | thread_t tid; |
fb0e1ba7 | 1651 | |
17faa917 | 1652 | tid = thread_info->private->tid; |
17faa917 DJ |
1653 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
1654 | tid, GET_LWP (ptid)); | |
fb0e1ba7 MK |
1655 | |
1656 | return buf; | |
1657 | } | |
1658 | ||
117de6a9 PA |
1659 | beneath = find_target_beneath (ops); |
1660 | if (beneath->to_pid_to_str (beneath, ptid)) | |
1661 | return beneath->to_pid_to_str (beneath, ptid); | |
fb0e1ba7 | 1662 | |
39f77062 | 1663 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1664 | } |
1665 | ||
28b17333 DJ |
1666 | /* Return a string describing the state of the thread specified by |
1667 | INFO. */ | |
1668 | ||
1669 | static char * | |
1670 | thread_db_extra_thread_info (struct thread_info *info) | |
1671 | { | |
17faa917 DJ |
1672 | if (info->private == NULL) |
1673 | return NULL; | |
1674 | ||
28b17333 DJ |
1675 | if (info->private->dying) |
1676 | return "Exiting"; | |
1677 | ||
1678 | return NULL; | |
1679 | } | |
1680 | ||
b2756930 KB |
1681 | /* Get the address of the thread local variable in load module LM which |
1682 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1683 | |
1684 | static CORE_ADDR | |
117de6a9 PA |
1685 | thread_db_get_thread_local_address (struct target_ops *ops, |
1686 | ptid_t ptid, | |
b2756930 | 1687 | CORE_ADDR lm, |
b4acd559 | 1688 | CORE_ADDR offset) |
3f47be5c | 1689 | { |
17faa917 | 1690 | struct thread_info *thread_info; |
117de6a9 | 1691 | struct target_ops *beneath; |
17faa917 | 1692 | |
4105de34 | 1693 | /* If we have not discovered any threads yet, check now. */ |
d90e17a7 PA |
1694 | if (!have_threads (ptid)) |
1695 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1696 | |
17faa917 | 1697 | /* Find the matching thread. */ |
e09875d4 | 1698 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1699 | |
17faa917 | 1700 | if (thread_info != NULL && thread_info->private != NULL) |
3f47be5c | 1701 | { |
3f47be5c | 1702 | td_err_e err; |
00f515da | 1703 | psaddr_t address; |
d90e17a7 PA |
1704 | struct thread_db_info *info; |
1705 | ||
1706 | info = get_thread_db_info (GET_PID (ptid)); | |
3f47be5c EZ |
1707 | |
1708 | /* glibc doesn't provide the needed interface. */ | |
d90e17a7 | 1709 | if (!info->td_thr_tls_get_addr_p) |
109c3e39 AC |
1710 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
1711 | _("No TLS library support")); | |
3f47be5c | 1712 | |
b2756930 KB |
1713 | /* Caller should have verified that lm != 0. */ |
1714 | gdb_assert (lm != 0); | |
3f47be5c | 1715 | |
3f47be5c | 1716 | /* Finally, get the address of the variable. */ |
00f515da DE |
1717 | /* Note the cast through uintptr_t: this interface only works if |
1718 | a target address fits in a psaddr_t, which is a host pointer. | |
1719 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
d90e17a7 | 1720 | err = info->td_thr_tls_get_addr_p (&thread_info->private->th, |
00f515da | 1721 | (psaddr_t)(uintptr_t) lm, |
d90e17a7 | 1722 | offset, &address); |
3f47be5c EZ |
1723 | |
1724 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1725 | /* The memory hasn't been allocated, yet. */ | |
1726 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1727 | /* Now, if libthread_db provided the initialization image's |
1728 | address, we *could* try to build a non-lvalue value from | |
1729 | the initialization image. */ | |
109c3e39 AC |
1730 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1731 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1732 | #endif |
1733 | ||
1734 | /* Something else went wrong. */ | |
1735 | if (err != TD_OK) | |
109c3e39 AC |
1736 | throw_error (TLS_GENERIC_ERROR, |
1737 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1738 | |
1739 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1740 | /* Do proper sign extension for the target. */ |
1741 | gdb_assert (exec_bfd); | |
1742 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1743 | ? (CORE_ADDR) (intptr_t) address | |
1744 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1745 | } |
1746 | ||
117de6a9 PA |
1747 | beneath = find_target_beneath (ops); |
1748 | if (beneath->to_get_thread_local_address) | |
1749 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); | |
93ad78a7 | 1750 | else |
109c3e39 AC |
1751 | throw_error (TLS_GENERIC_ERROR, |
1752 | _("TLS not supported on this target")); | |
3f47be5c EZ |
1753 | } |
1754 | ||
0ef643c8 JB |
1755 | /* Callback routine used to find a thread based on the TID part of |
1756 | its PTID. */ | |
1757 | ||
1758 | static int | |
1759 | thread_db_find_thread_from_tid (struct thread_info *thread, void *data) | |
1760 | { | |
1761 | long *tid = (long *) data; | |
1762 | ||
1763 | if (thread->private->tid == *tid) | |
1764 | return 1; | |
1765 | ||
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | /* Implement the to_get_ada_task_ptid target method for this target. */ | |
1770 | ||
1771 | static ptid_t | |
1772 | thread_db_get_ada_task_ptid (long lwp, long thread) | |
1773 | { | |
1774 | struct thread_info *thread_info; | |
1775 | ||
d90e17a7 | 1776 | thread_db_find_new_threads_1 (inferior_ptid); |
0ef643c8 JB |
1777 | thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread); |
1778 | ||
1779 | gdb_assert (thread_info != NULL); | |
1780 | ||
1781 | return (thread_info->ptid); | |
1782 | } | |
1783 | ||
4d062f1a PA |
1784 | static void |
1785 | thread_db_resume (struct target_ops *ops, | |
1786 | ptid_t ptid, int step, enum target_signal signo) | |
1787 | { | |
1788 | struct target_ops *beneath = find_target_beneath (ops); | |
1789 | struct thread_db_info *info; | |
1790 | ||
1791 | if (ptid_equal (ptid, minus_one_ptid)) | |
1792 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
1793 | else | |
1794 | info = get_thread_db_info (GET_PID (ptid)); | |
1795 | ||
1796 | /* This workaround is only needed for child fork lwps stopped in a | |
1797 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1798 | workaround can be disabled. */ | |
1799 | if (info) | |
1800 | info->need_stale_parent_threads_check = 0; | |
1801 | ||
1802 | beneath->to_resume (beneath, ptid, step, signo); | |
1803 | } | |
1804 | ||
fb0e1ba7 MK |
1805 | static void |
1806 | init_thread_db_ops (void) | |
1807 | { | |
1808 | thread_db_ops.to_shortname = "multi-thread"; | |
1809 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1810 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
1811 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 1812 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 1813 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 1814 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
fb0e1ba7 MK |
1815 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
1816 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1817 | thread_db_ops.to_stratum = thread_stratum; | |
1818 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1819 | thread_db_ops.to_get_thread_local_address |
1820 | = thread_db_get_thread_local_address; | |
28b17333 | 1821 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 1822 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 MK |
1823 | thread_db_ops.to_magic = OPS_MAGIC; |
1824 | } | |
1825 | ||
2c0b251b PA |
1826 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1827 | extern initialize_file_ftype _initialize_thread_db; | |
1828 | ||
fb0e1ba7 MK |
1829 | void |
1830 | _initialize_thread_db (void) | |
1831 | { | |
17a37d48 PP |
1832 | init_thread_db_ops (); |
1833 | add_target (&thread_db_ops); | |
1834 | ||
1835 | /* Defer loading of libthread_db.so until inferior is running. | |
1836 | This allows gdb to load correct libthread_db for a given | |
1837 | executable -- there could be mutiple versions of glibc, | |
1838 | compiled with LinuxThreads or NPTL, and until there is | |
1839 | a running inferior, we can't tell which libthread_db is | |
1777feb0 | 1840 | the correct one to load. */ |
17a37d48 PP |
1841 | |
1842 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1843 | ||
1844 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1845 | class_support, | |
1846 | &libthread_db_search_path, _("\ | |
1847 | Set search path for libthread_db."), _("\ | |
1848 | Show the current search path or libthread_db."), _("\ | |
1849 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
1850 | gdb itself.\n\ |
1851 | Its value is a colon (':') separate list of directories to search.\n\ | |
1852 | Setting the search path to an empty list resets it to its default value."), | |
1853 | set_libthread_db_search_path, | |
17a37d48 PP |
1854 | NULL, |
1855 | &setlist, &showlist); | |
02d868e8 PP |
1856 | |
1857 | add_setshow_zinteger_cmd ("libthread-db", class_maintenance, | |
1858 | &libthread_db_debug, _("\ | |
1859 | Set libthread-db debugging."), _("\ | |
1860 | Show libthread-db debugging."), _("\ | |
1861 | When non-zero, libthread-db debugging is enabled."), | |
1862 | NULL, | |
1863 | show_libthread_db_debug, | |
1864 | &setdebuglist, &showdebuglist); | |
1865 | ||
17a37d48 PP |
1866 | /* Add ourselves to objfile event chain. */ |
1867 | observer_attach_new_objfile (thread_db_new_objfile); | |
0838fb57 DE |
1868 | |
1869 | /* Add ourselves to inferior_created event chain. | |
1870 | This is needed to handle debugging statically linked programs where | |
1871 | the new_objfile observer won't get called for libpthread. */ | |
1872 | observer_attach_inferior_created (thread_db_inferior_created); | |
fb0e1ba7 | 1873 | } |