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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
4c38e0a4 | 3 | Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, |
7b6bb8da | 4 | 2010, 2011 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" |
13da1c97 | 43 | #include "linux-procfs.h" |
fb0e1ba7 | 44 | |
979894f2 NR |
45 | #include <signal.h> |
46 | ||
a2f23071 DJ |
47 | #ifdef HAVE_GNU_LIBC_VERSION_H |
48 | #include <gnu/libc-version.h> | |
49 | #endif | |
50 | ||
17faa917 DJ |
51 | /* GNU/Linux libthread_db support. |
52 | ||
53 | libthread_db is a library, provided along with libpthread.so, which | |
54 | exposes the internals of the thread library to a debugger. It | |
55 | allows GDB to find existing threads, new threads as they are | |
56 | created, thread IDs (usually, the result of pthread_self), and | |
57 | thread-local variables. | |
58 | ||
59 | The libthread_db interface originates on Solaris, where it is | |
60 | both more powerful and more complicated. This implementation | |
61 | only works for LinuxThreads and NPTL, the two glibc threading | |
62 | libraries. It assumes that each thread is permanently assigned | |
63 | to a single light-weight process (LWP). | |
64 | ||
65 | libthread_db-specific information is stored in the "private" field | |
66 | of struct thread_info. When the field is NULL we do not yet have | |
67 | information about the new thread; this could be temporary (created, | |
68 | but the thread library's data structures do not reflect it yet) | |
69 | or permanent (created using clone instead of pthread_create). | |
70 | ||
71 | Process IDs managed by linux-thread-db.c match those used by | |
72 | linux-nat.c: a common PID for all processes, an LWP ID for each | |
73 | thread, and no TID. We save the TID in private. Keeping it out | |
74 | of the ptid_t prevents thread IDs changing when libpthread is | |
75 | loaded or unloaded. */ | |
76 | ||
17a37d48 PP |
77 | static char *libthread_db_search_path; |
78 | ||
84e578fb DE |
79 | static void |
80 | set_libthread_db_search_path (char *ignored, int from_tty, | |
81 | struct cmd_list_element *c) | |
82 | { | |
83 | if (*libthread_db_search_path == '\0') | |
84 | { | |
85 | xfree (libthread_db_search_path); | |
86 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
87 | } | |
88 | } | |
89 | ||
02d868e8 PP |
90 | /* If non-zero, print details of libthread_db processing. */ |
91 | ||
92 | static int libthread_db_debug; | |
93 | ||
94 | static void | |
95 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
96 | struct cmd_list_element *c, const char *value) | |
97 | { | |
98 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
99 | } | |
100 | ||
8605d56e AC |
101 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
102 | threads. */ | |
fb0e1ba7 | 103 | |
fb0e1ba7 MK |
104 | /* This module's target vector. */ |
105 | static struct target_ops thread_db_ops; | |
106 | ||
fb0e1ba7 MK |
107 | /* Non-zero if we have determined the signals used by the threads |
108 | library. */ | |
109 | static int thread_signals; | |
110 | static sigset_t thread_stop_set; | |
111 | static sigset_t thread_print_set; | |
112 | ||
d90e17a7 PA |
113 | struct thread_db_info |
114 | { | |
115 | struct thread_db_info *next; | |
116 | ||
117 | /* Process id this object refers to. */ | |
118 | int pid; | |
119 | ||
120 | /* Handle from dlopen for libthread_db.so. */ | |
121 | void *handle; | |
122 | ||
123 | /* Structure that identifies the child process for the | |
124 | <proc_service.h> interface. */ | |
125 | struct ps_prochandle proc_handle; | |
126 | ||
127 | /* Connection to the libthread_db library. */ | |
128 | td_thragent_t *thread_agent; | |
129 | ||
4d062f1a PA |
130 | /* True if we need to apply the workaround for glibc/BZ5983. When |
131 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
132 | list, nptl_db returns the parent's threads in addition to the new | |
133 | (single) child thread. If this flag is set, we do extra work to | |
134 | be able to ignore such stale entries. */ | |
135 | int need_stale_parent_threads_check; | |
136 | ||
d90e17a7 PA |
137 | /* Location of the thread creation event breakpoint. The code at |
138 | this location in the child process will be called by the pthread | |
139 | library whenever a new thread is created. By setting a special | |
140 | breakpoint at this location, GDB can detect when a new thread is | |
141 | created. We obtain this location via the td_ta_event_addr | |
142 | call. */ | |
143 | CORE_ADDR td_create_bp_addr; | |
fb0e1ba7 | 144 | |
d90e17a7 PA |
145 | /* Location of the thread death event breakpoint. */ |
146 | CORE_ADDR td_death_bp_addr; | |
fb0e1ba7 | 147 | |
d90e17a7 | 148 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 149 | |
d90e17a7 | 150 | td_err_e (*td_init_p) (void); |
fb0e1ba7 | 151 | |
d90e17a7 | 152 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
b4acd559 | 153 | td_thragent_t **ta); |
d90e17a7 PA |
154 | td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
155 | td_thrhandle_t *__th); | |
156 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, | |
157 | lwpid_t lwpid, td_thrhandle_t *th); | |
158 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
159 | td_thr_iter_f *callback, void *cbdata_p, | |
160 | td_thr_state_e state, int ti_pri, | |
161 | sigset_t *ti_sigmask_p, | |
162 | unsigned int ti_user_flags); | |
163 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
164 | td_event_e event, td_notify_t *ptr); | |
165 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
166 | td_thr_events_t *event); | |
21e1bee4 PP |
167 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
168 | td_thr_events_t *event); | |
d90e17a7 PA |
169 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
170 | td_event_msg_t *msg); | |
171 | ||
172 | td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
173 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
174 | td_thrinfo_t *infop); | |
175 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, | |
176 | int event); | |
177 | ||
178 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
179 | psaddr_t map_address, |
180 | size_t offset, psaddr_t *address); | |
d90e17a7 PA |
181 | }; |
182 | ||
183 | /* List of known processes using thread_db, and the required | |
184 | bookkeeping. */ | |
185 | struct thread_db_info *thread_db_list; | |
186 | ||
187 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 188 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 PA |
189 | |
190 | /* Add the current inferior to the list of processes using libpthread. | |
191 | Return a pointer to the newly allocated object that was added to | |
192 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
193 | LIBTHREAD_DB_SO. */ | |
194 | ||
195 | static struct thread_db_info * | |
196 | add_thread_db_info (void *handle) | |
197 | { | |
d90e17a7 PA |
198 | struct thread_db_info *info; |
199 | ||
200 | info = xcalloc (1, sizeof (*info)); | |
201 | info->pid = ptid_get_pid (inferior_ptid); | |
202 | info->handle = handle; | |
856d6f99 PA |
203 | |
204 | /* The workaround works by reading from /proc/pid/status, so it is | |
205 | disabled for core files. */ | |
206 | if (target_has_execution) | |
207 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
208 | |
209 | info->next = thread_db_list; | |
210 | thread_db_list = info; | |
211 | ||
212 | return info; | |
213 | } | |
214 | ||
215 | /* Return the thread_db_info object representing the bookkeeping | |
216 | related to process PID, if any; NULL otherwise. */ | |
217 | ||
218 | static struct thread_db_info * | |
219 | get_thread_db_info (int pid) | |
220 | { | |
221 | struct thread_db_info *info; | |
222 | ||
223 | for (info = thread_db_list; info; info = info->next) | |
224 | if (pid == info->pid) | |
225 | return info; | |
226 | ||
227 | return NULL; | |
228 | } | |
229 | ||
230 | /* When PID has exited or has been detached, we no longer want to keep | |
231 | track of it as using libpthread. Call this function to discard | |
232 | thread_db related info related to PID. Note that this closes | |
233 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
234 | ||
235 | static void | |
236 | delete_thread_db_info (int pid) | |
237 | { | |
238 | struct thread_db_info *info, *info_prev; | |
239 | ||
240 | info_prev = NULL; | |
241 | ||
242 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
243 | if (pid == info->pid) | |
244 | break; | |
245 | ||
246 | if (info == NULL) | |
247 | return; | |
248 | ||
249 | if (info->handle != NULL) | |
250 | dlclose (info->handle); | |
251 | ||
252 | if (info_prev) | |
253 | info_prev->next = info->next; | |
254 | else | |
255 | thread_db_list = info->next; | |
256 | ||
257 | xfree (info); | |
258 | } | |
fb0e1ba7 MK |
259 | |
260 | /* Prototypes for local functions. */ | |
02c6c942 PP |
261 | static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
262 | const td_thrinfo_t *ti_p); | |
17faa917 | 263 | static void detach_thread (ptid_t ptid); |
fb0e1ba7 MK |
264 | \f |
265 | ||
5365276c DJ |
266 | /* Use "struct private_thread_info" to cache thread state. This is |
267 | a substantial optimization. */ | |
268 | ||
fb0e1ba7 MK |
269 | struct private_thread_info |
270 | { | |
a2f23071 DJ |
271 | /* Flag set when we see a TD_DEATH event for this thread. */ |
272 | unsigned int dying:1; | |
273 | ||
5365276c | 274 | /* Cached thread state. */ |
5365276c | 275 | td_thrhandle_t th; |
17faa917 | 276 | thread_t tid; |
fb0e1ba7 | 277 | }; |
fb0e1ba7 | 278 | \f |
21bf60fe | 279 | |
fb0e1ba7 MK |
280 | static char * |
281 | thread_db_err_str (td_err_e err) | |
282 | { | |
283 | static char buf[64]; | |
284 | ||
285 | switch (err) | |
286 | { | |
287 | case TD_OK: | |
288 | return "generic 'call succeeded'"; | |
289 | case TD_ERR: | |
290 | return "generic error"; | |
291 | case TD_NOTHR: | |
292 | return "no thread to satisfy query"; | |
293 | case TD_NOSV: | |
294 | return "no sync handle to satisfy query"; | |
295 | case TD_NOLWP: | |
296 | return "no LWP to satisfy query"; | |
297 | case TD_BADPH: | |
298 | return "invalid process handle"; | |
299 | case TD_BADTH: | |
300 | return "invalid thread handle"; | |
301 | case TD_BADSH: | |
302 | return "invalid synchronization handle"; | |
303 | case TD_BADTA: | |
304 | return "invalid thread agent"; | |
305 | case TD_BADKEY: | |
306 | return "invalid key"; | |
307 | case TD_NOMSG: | |
308 | return "no event message for getmsg"; | |
309 | case TD_NOFPREGS: | |
310 | return "FPU register set not available"; | |
311 | case TD_NOLIBTHREAD: | |
312 | return "application not linked with libthread"; | |
313 | case TD_NOEVENT: | |
314 | return "requested event is not supported"; | |
315 | case TD_NOCAPAB: | |
316 | return "capability not available"; | |
317 | case TD_DBERR: | |
318 | return "debugger service failed"; | |
319 | case TD_NOAPLIC: | |
320 | return "operation not applicable to"; | |
321 | case TD_NOTSD: | |
322 | return "no thread-specific data for this thread"; | |
323 | case TD_MALLOC: | |
324 | return "malloc failed"; | |
325 | case TD_PARTIALREG: | |
326 | return "only part of register set was written/read"; | |
327 | case TD_NOXREGS: | |
328 | return "X register set not available for this thread"; | |
59f80f10 DJ |
329 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
330 | case TD_NOTALLOC: | |
331 | return "thread has not yet allocated TLS for given module"; | |
332 | #endif | |
333 | #ifdef THREAD_DB_HAS_TD_VERSION | |
334 | case TD_VERSION: | |
335 | return "versions of libpthread and libthread_db do not match"; | |
336 | #endif | |
337 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
338 | case TD_NOTLS: | |
339 | return "there is no TLS segment in the given module"; | |
340 | #endif | |
fb0e1ba7 MK |
341 | default: |
342 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
343 | return buf; | |
344 | } | |
345 | } | |
fb0e1ba7 | 346 | \f |
4105de34 DJ |
347 | /* Return 1 if any threads have been registered. There may be none if |
348 | the threading library is not fully initialized yet. */ | |
349 | ||
350 | static int | |
d90e17a7 | 351 | have_threads_callback (struct thread_info *thread, void *args) |
4105de34 | 352 | { |
d90e17a7 | 353 | int pid = * (int *) args; |
e0881a8e | 354 | |
d90e17a7 PA |
355 | if (ptid_get_pid (thread->ptid) != pid) |
356 | return 0; | |
357 | ||
e3bc4218 | 358 | return thread->private != NULL; |
4105de34 DJ |
359 | } |
360 | ||
361 | static int | |
d90e17a7 | 362 | have_threads (ptid_t ptid) |
4105de34 | 363 | { |
d90e17a7 PA |
364 | int pid = ptid_get_pid (ptid); |
365 | ||
366 | return iterate_over_threads (have_threads_callback, &pid) != NULL; | |
4105de34 DJ |
367 | } |
368 | ||
d90e17a7 PA |
369 | struct thread_get_info_inout |
370 | { | |
371 | struct thread_info *thread_info; | |
372 | struct thread_db_info *thread_db_info; | |
373 | }; | |
374 | ||
5365276c | 375 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 376 | threads to LWPs. |
5365276c DJ |
377 | |
378 | THP is a handle to the current thread; if INFOP is not NULL, the | |
379 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
380 | *INFOP. |
381 | ||
382 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
383 | zero is returned to indicate success. */ | |
5365276c DJ |
384 | |
385 | static int | |
d90e17a7 | 386 | thread_get_info_callback (const td_thrhandle_t *thp, void *argp) |
5365276c DJ |
387 | { |
388 | td_thrinfo_t ti; | |
389 | td_err_e err; | |
5365276c | 390 | ptid_t thread_ptid; |
d90e17a7 PA |
391 | struct thread_get_info_inout *inout; |
392 | struct thread_db_info *info; | |
393 | ||
394 | inout = argp; | |
395 | info = inout->thread_db_info; | |
5365276c | 396 | |
d90e17a7 | 397 | err = info->td_thr_get_info_p (thp, &ti); |
5365276c | 398 | if (err != TD_OK) |
8a3fe4f8 | 399 | error (_("thread_get_info_callback: cannot get thread info: %s"), |
5365276c DJ |
400 | thread_db_err_str (err)); |
401 | ||
402 | /* Fill the cache. */ | |
d90e17a7 | 403 | thread_ptid = ptid_build (info->pid, ti.ti_lid, 0); |
e09875d4 | 404 | inout->thread_info = find_thread_ptid (thread_ptid); |
5365276c | 405 | |
b9b5d7ea | 406 | /* In the case of a zombie thread, don't continue. We don't want to |
f90ef764 | 407 | attach to it thinking it is a new thread. */ |
b9b5d7ea | 408 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
d90e17a7 | 409 | return TD_THR_ZOMBIE; |
b9b5d7ea | 410 | |
d90e17a7 | 411 | if (inout->thread_info == NULL) |
5365276c DJ |
412 | { |
413 | /* New thread. Attach to it now (why wait?). */ | |
d90e17a7 PA |
414 | if (!have_threads (thread_ptid)) |
415 | thread_db_find_new_threads_1 (thread_ptid); | |
4c28f408 PA |
416 | else |
417 | attach_thread (thread_ptid, thp, &ti); | |
e09875d4 | 418 | inout->thread_info = find_thread_ptid (thread_ptid); |
d90e17a7 | 419 | gdb_assert (inout->thread_info != NULL); |
5365276c DJ |
420 | } |
421 | ||
5365276c DJ |
422 | return 0; |
423 | } | |
5365276c | 424 | \f |
fb0e1ba7 MK |
425 | /* Convert between user-level thread ids and LWP ids. */ |
426 | ||
39f77062 KB |
427 | static ptid_t |
428 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 | 429 | { |
fb0e1ba7 MK |
430 | td_thrhandle_t th; |
431 | td_err_e err; | |
d90e17a7 PA |
432 | struct thread_db_info *info; |
433 | struct thread_get_info_inout io = {0}; | |
fb0e1ba7 | 434 | |
6cb9b55b PP |
435 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
436 | th.th_unique = 0; | |
437 | ||
17faa917 DJ |
438 | /* This ptid comes from linux-nat.c, which should always fill in the |
439 | LWP. */ | |
440 | gdb_assert (GET_LWP (ptid) != 0); | |
fb0e1ba7 | 441 | |
d90e17a7 PA |
442 | info = get_thread_db_info (GET_PID (ptid)); |
443 | ||
4c28f408 | 444 | /* Access an lwp we know is stopped. */ |
d90e17a7 PA |
445 | info->proc_handle.ptid = ptid; |
446 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); | |
fb0e1ba7 | 447 | if (err != TD_OK) |
8a3fe4f8 | 448 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
39f77062 | 449 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 450 | |
b9b5d7ea JJ |
451 | /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the |
452 | event thread has already died. If another gdb interface has called | |
453 | thread_alive() previously, the thread won't be found on the thread list | |
454 | anymore. In that case, we don't want to process this ptid anymore | |
455 | to avoid the possibility of later treating it as a newly | |
456 | discovered thread id that we should add to the list. Thus, | |
457 | we return a -1 ptid which is also how the thread list marks a | |
458 | dead thread. */ | |
d90e17a7 PA |
459 | io.thread_db_info = info; |
460 | io.thread_info = NULL; | |
461 | if (thread_get_info_callback (&th, &io) == TD_THR_ZOMBIE | |
462 | && io.thread_info == NULL) | |
463 | return minus_one_ptid; | |
b9b5d7ea | 464 | |
17faa917 DJ |
465 | gdb_assert (ptid_get_tid (ptid) == 0); |
466 | return ptid; | |
fb0e1ba7 MK |
467 | } |
468 | \f | |
469 | ||
4c28f408 PA |
470 | /* Attach to lwp PTID, doing whatever else is required to have this |
471 | LWP under the debugger's control --- e.g., enabling event | |
472 | reporting. Returns true on success. */ | |
473 | int | |
474 | thread_db_attach_lwp (ptid_t ptid) | |
475 | { | |
476 | td_thrhandle_t th; | |
477 | td_thrinfo_t ti; | |
478 | td_err_e err; | |
d90e17a7 | 479 | struct thread_db_info *info; |
4c28f408 | 480 | |
d90e17a7 PA |
481 | info = get_thread_db_info (GET_PID (ptid)); |
482 | ||
483 | if (info == NULL) | |
4c28f408 PA |
484 | return 0; |
485 | ||
486 | /* This ptid comes from linux-nat.c, which should always fill in the | |
487 | LWP. */ | |
488 | gdb_assert (GET_LWP (ptid) != 0); | |
489 | ||
490 | /* Access an lwp we know is stopped. */ | |
d90e17a7 | 491 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
492 | |
493 | /* If we have only looked at the first thread before libpthread was | |
494 | initialized, we may not know its thread ID yet. Make sure we do | |
495 | before we add another thread to the list. */ | |
d90e17a7 PA |
496 | if (!have_threads (ptid)) |
497 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 498 | |
d90e17a7 | 499 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); |
4c28f408 PA |
500 | if (err != TD_OK) |
501 | /* Cannot find user-level thread. */ | |
502 | return 0; | |
503 | ||
d90e17a7 | 504 | err = info->td_thr_get_info_p (&th, &ti); |
4c28f408 PA |
505 | if (err != TD_OK) |
506 | { | |
507 | warning (_("Cannot get thread info: %s"), thread_db_err_str (err)); | |
508 | return 0; | |
509 | } | |
510 | ||
511 | attach_thread (ptid, &th, &ti); | |
512 | return 1; | |
513 | } | |
514 | ||
5220ea4c AC |
515 | static void * |
516 | verbose_dlsym (void *handle, const char *name) | |
517 | { | |
518 | void *sym = dlsym (handle, name); | |
519 | if (sym == NULL) | |
3e43a32a MS |
520 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
521 | name, dlerror ()); | |
5220ea4c AC |
522 | return sym; |
523 | } | |
524 | ||
cdbc0b18 | 525 | static td_err_e |
d90e17a7 | 526 | enable_thread_event (int event, CORE_ADDR *bp) |
24557e30 AC |
527 | { |
528 | td_notify_t notify; | |
cdbc0b18 | 529 | td_err_e err; |
d90e17a7 PA |
530 | struct thread_db_info *info; |
531 | ||
532 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
24557e30 | 533 | |
4c28f408 | 534 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 535 | info->proc_handle.ptid = inferior_ptid; |
4c28f408 | 536 | |
24557e30 | 537 | /* Get the breakpoint address for thread EVENT. */ |
d90e17a7 | 538 | err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify); |
24557e30 | 539 | if (err != TD_OK) |
cdbc0b18 | 540 | return err; |
24557e30 AC |
541 | |
542 | /* Set up the breakpoint. */ | |
16451949 AS |
543 | gdb_assert (exec_bfd); |
544 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
a97b0ac8 | 545 | (target_gdbarch, |
16451949 AS |
546 | /* Do proper sign extension for the target. */ |
547 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
548 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
549 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
550 | ¤t_target)); | |
a6d9a66e | 551 | create_thread_event_breakpoint (target_gdbarch, *bp); |
24557e30 | 552 | |
cdbc0b18 | 553 | return TD_OK; |
24557e30 AC |
554 | } |
555 | ||
fb0e1ba7 MK |
556 | static void |
557 | enable_thread_event_reporting (void) | |
558 | { | |
559 | td_thr_events_t events; | |
fb0e1ba7 | 560 | td_err_e err; |
a2f23071 DJ |
561 | #ifdef HAVE_GNU_LIBC_VERSION_H |
562 | const char *libc_version; | |
563 | int libc_major, libc_minor; | |
564 | #endif | |
d90e17a7 PA |
565 | struct thread_db_info *info; |
566 | ||
567 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
fb0e1ba7 MK |
568 | |
569 | /* We cannot use the thread event reporting facility if these | |
570 | functions aren't available. */ | |
d90e17a7 PA |
571 | if (info->td_ta_event_addr_p == NULL |
572 | || info->td_ta_set_event_p == NULL | |
573 | || info->td_ta_event_getmsg_p == NULL | |
574 | || info->td_thr_event_enable_p == NULL) | |
fb0e1ba7 MK |
575 | return; |
576 | ||
577 | /* Set the process wide mask saying which events we're interested in. */ | |
578 | td_event_emptyset (&events); | |
579 | td_event_addset (&events, TD_CREATE); | |
a2f23071 DJ |
580 | |
581 | #ifdef HAVE_GNU_LIBC_VERSION_H | |
34091d9b | 582 | /* The event reporting facility is broken for TD_DEATH events in |
2ef52e77 | 583 | glibc 2.1.3, so don't enable it if we have glibc but a lower |
34091d9b | 584 | version. */ |
a2f23071 DJ |
585 | libc_version = gnu_get_libc_version (); |
586 | if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 | |
587 | && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) | |
fb0e1ba7 | 588 | #endif |
a2f23071 | 589 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 | 590 | |
d90e17a7 | 591 | err = info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
592 | if (err != TD_OK) |
593 | { | |
8a3fe4f8 | 594 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
595 | thread_db_err_str (err)); |
596 | return; | |
597 | } | |
598 | ||
599 | /* Delete previous thread event breakpoints, if any. */ | |
600 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
601 | info->td_create_bp_addr = 0; |
602 | info->td_death_bp_addr = 0; | |
fb0e1ba7 | 603 | |
24557e30 | 604 | /* Set up the thread creation event. */ |
d90e17a7 | 605 | err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr); |
cdbc0b18 | 606 | if (err != TD_OK) |
fb0e1ba7 | 607 | { |
8a3fe4f8 | 608 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
609 | thread_db_err_str (err)); |
610 | return; | |
611 | } | |
612 | ||
24557e30 | 613 | /* Set up the thread death event. */ |
d90e17a7 | 614 | err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr); |
cdbc0b18 | 615 | if (err != TD_OK) |
fb0e1ba7 | 616 | { |
8a3fe4f8 | 617 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
618 | thread_db_err_str (err)); |
619 | return; | |
620 | } | |
fb0e1ba7 MK |
621 | } |
622 | ||
456b0e24 PP |
623 | /* Same as thread_db_find_new_threads_1, but silently ignore errors. */ |
624 | ||
625 | static void | |
626 | thread_db_find_new_threads_silently (ptid_t ptid) | |
627 | { | |
628 | volatile struct gdb_exception except; | |
629 | ||
630 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
631 | { | |
02c6c942 | 632 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
633 | } |
634 | ||
02d868e8 | 635 | if (except.reason < 0 && libthread_db_debug) |
e0881a8e MS |
636 | { |
637 | exception_fprintf (gdb_stderr, except, | |
638 | "Warning: thread_db_find_new_threads_silently: "); | |
639 | } | |
456b0e24 PP |
640 | } |
641 | ||
d90e17a7 PA |
642 | /* Lookup a library in which given symbol resides. |
643 | Note: this is looking in GDB process, not in the inferior. | |
644 | Returns library name, or NULL. */ | |
645 | ||
646 | static const char * | |
647 | dladdr_to_soname (const void *addr) | |
648 | { | |
649 | Dl_info info; | |
650 | ||
651 | if (dladdr (addr, &info) != 0) | |
652 | return info.dli_fname; | |
653 | return NULL; | |
654 | } | |
655 | ||
2471d008 | 656 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
657 | Return 1 on success. |
658 | Failure could happen if libthread_db does not have symbols we expect, | |
659 | or when it refuses to work with the current inferior (e.g. due to | |
660 | version mismatch between libthread_db and libpthread). */ | |
661 | ||
662 | static int | |
d90e17a7 | 663 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
664 | { |
665 | td_err_e err; | |
666 | ||
667 | /* Initialize pointers to the dynamic library functions we will use. | |
668 | Essential functions first. */ | |
669 | ||
d90e17a7 PA |
670 | info->td_init_p = verbose_dlsym (info->handle, "td_init"); |
671 | if (info->td_init_p == NULL) | |
17a37d48 PP |
672 | return 0; |
673 | ||
d90e17a7 | 674 | err = info->td_init_p (); |
17a37d48 PP |
675 | if (err != TD_OK) |
676 | { | |
3e43a32a MS |
677 | warning (_("Cannot initialize libthread_db: %s"), |
678 | thread_db_err_str (err)); | |
17a37d48 PP |
679 | return 0; |
680 | } | |
681 | ||
d90e17a7 PA |
682 | info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new"); |
683 | if (info->td_ta_new_p == NULL) | |
17a37d48 PP |
684 | return 0; |
685 | ||
686 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 687 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
688 | |
689 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 690 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
691 | if (err != TD_OK) |
692 | { | |
02d868e8 | 693 | if (libthread_db_debug) |
17a37d48 PP |
694 | printf_unfiltered (_("td_ta_new failed: %s\n"), |
695 | thread_db_err_str (err)); | |
696 | else | |
697 | switch (err) | |
698 | { | |
699 | case TD_NOLIBTHREAD: | |
700 | #ifdef THREAD_DB_HAS_TD_VERSION | |
701 | case TD_VERSION: | |
702 | #endif | |
703 | /* The errors above are not unexpected and silently ignored: | |
704 | they just mean we haven't found correct version of | |
705 | libthread_db yet. */ | |
706 | break; | |
707 | default: | |
708 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
709 | } | |
710 | return 0; | |
711 | } | |
712 | ||
d90e17a7 PA |
713 | info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr"); |
714 | if (info->td_ta_map_id2thr_p == NULL) | |
17a37d48 PP |
715 | return 0; |
716 | ||
3e43a32a MS |
717 | info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, |
718 | "td_ta_map_lwp2thr"); | |
d90e17a7 | 719 | if (info->td_ta_map_lwp2thr_p == NULL) |
17a37d48 PP |
720 | return 0; |
721 | ||
d90e17a7 PA |
722 | info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter"); |
723 | if (info->td_ta_thr_iter_p == NULL) | |
17a37d48 PP |
724 | return 0; |
725 | ||
d90e17a7 PA |
726 | info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate"); |
727 | if (info->td_thr_validate_p == NULL) | |
17a37d48 PP |
728 | return 0; |
729 | ||
d90e17a7 PA |
730 | info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info"); |
731 | if (info->td_thr_get_info_p == NULL) | |
17a37d48 PP |
732 | return 0; |
733 | ||
734 | /* These are not essential. */ | |
d90e17a7 PA |
735 | info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr"); |
736 | info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event"); | |
21e1bee4 | 737 | info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event"); |
d90e17a7 PA |
738 | info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); |
739 | info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); | |
740 | info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); | |
17a37d48 PP |
741 | |
742 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); | |
743 | ||
02d868e8 | 744 | if (libthread_db_debug || *libthread_db_search_path) |
d90e17a7 PA |
745 | { |
746 | const char *library; | |
17a37d48 | 747 | |
d90e17a7 PA |
748 | library = dladdr_to_soname (*info->td_ta_new_p); |
749 | if (library == NULL) | |
750 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 751 | |
d90e17a7 PA |
752 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
753 | library); | |
754 | } | |
17a37d48 | 755 | |
d90e17a7 PA |
756 | /* The thread library was detected. Activate the thread_db target |
757 | if this is the first process using it. */ | |
758 | if (thread_db_list->next == NULL) | |
759 | push_target (&thread_db_ops); | |
17a37d48 | 760 | |
856d6f99 PA |
761 | /* Enable event reporting, but not when debugging a core file. */ |
762 | if (target_has_execution) | |
763 | enable_thread_event_reporting (); | |
456b0e24 | 764 | |
099cb4fb | 765 | /* There appears to be a bug in glibc-2.3.6: calls to td_thr_get_info fail |
456b0e24 PP |
766 | with TD_ERR for statically linked executables if td_thr_get_info is |
767 | called before glibc has initialized itself. Silently ignore such | |
099cb4fb | 768 | errors, and let gdb enumerate threads again later. */ |
456b0e24 | 769 | thread_db_find_new_threads_silently (inferior_ptid); |
099cb4fb | 770 | |
d90e17a7 | 771 | return 1; |
17a37d48 PP |
772 | } |
773 | ||
774 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
775 | relative, or just LIBTHREAD_DB. */ | |
776 | ||
777 | static int | |
778 | try_thread_db_load (const char *library) | |
779 | { | |
780 | void *handle; | |
d90e17a7 | 781 | struct thread_db_info *info; |
17a37d48 | 782 | |
02d868e8 | 783 | if (libthread_db_debug) |
17a37d48 PP |
784 | printf_unfiltered (_("Trying host libthread_db library: %s.\n"), |
785 | library); | |
786 | handle = dlopen (library, RTLD_NOW); | |
787 | if (handle == NULL) | |
788 | { | |
02d868e8 | 789 | if (libthread_db_debug) |
17a37d48 PP |
790 | printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ()); |
791 | return 0; | |
792 | } | |
793 | ||
02d868e8 | 794 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
795 | { |
796 | void *td_init; | |
797 | ||
798 | td_init = dlsym (handle, "td_init"); | |
799 | if (td_init != NULL) | |
800 | { | |
801 | const char *const libpath = dladdr_to_soname (td_init); | |
802 | ||
803 | if (libpath != NULL) | |
804 | printf_unfiltered (_("Host %s resolved to: %s.\n"), | |
805 | library, libpath); | |
806 | } | |
807 | } | |
808 | ||
d90e17a7 PA |
809 | info = add_thread_db_info (handle); |
810 | ||
811 | if (try_thread_db_load_1 (info)) | |
17a37d48 PP |
812 | return 1; |
813 | ||
814 | /* This library "refused" to work on current inferior. */ | |
d90e17a7 | 815 | delete_thread_db_info (GET_PID (inferior_ptid)); |
17a37d48 PP |
816 | return 0; |
817 | } | |
818 | ||
290351b8 DE |
819 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
820 | Try loading libthread_db from the same directory as OBJ. | |
821 | The result is true for success. */ | |
822 | ||
823 | static int | |
824 | try_thread_db_load_from_pdir_1 (struct objfile *obj) | |
825 | { | |
05386e9e TT |
826 | struct cleanup *cleanup; |
827 | char *path, *cp; | |
828 | int result; | |
290351b8 | 829 | |
05386e9e | 830 | if (obj->name[0] != '/') |
290351b8 DE |
831 | { |
832 | warning (_("Expected absolute pathname for libpthread in the" | |
05386e9e | 833 | " inferior, but got %s."), obj->name); |
290351b8 DE |
834 | return 0; |
835 | } | |
05386e9e TT |
836 | |
837 | path = xmalloc (strlen (obj->name) + 1 + strlen (LIBTHREAD_DB_SO) + 1); | |
838 | cleanup = make_cleanup (xfree, path); | |
839 | ||
840 | strcpy (path, obj->name); | |
841 | cp = strrchr (path, '/'); | |
842 | /* This should at minimum hit the first character. */ | |
843 | gdb_assert (cp != NULL); | |
844 | strcpy (cp + 1, LIBTHREAD_DB_SO); | |
845 | result = try_thread_db_load (path); | |
846 | ||
847 | do_cleanups (cleanup); | |
848 | return result; | |
290351b8 DE |
849 | } |
850 | ||
98a5dd13 DE |
851 | /* Handle $pdir in libthread-db-search-path. |
852 | Look for libthread_db in the directory of libpthread. | |
853 | The result is true for success. */ | |
854 | ||
855 | static int | |
856 | try_thread_db_load_from_pdir (void) | |
857 | { | |
858 | struct objfile *obj; | |
859 | ||
860 | ALL_OBJFILES (obj) | |
861 | if (libpthread_name_p (obj->name)) | |
862 | { | |
290351b8 DE |
863 | if (try_thread_db_load_from_pdir_1 (obj)) |
864 | return 1; | |
865 | ||
866 | /* We may have found the separate-debug-info version of | |
867 | libpthread, and it may live in a directory without a matching | |
868 | libthread_db. */ | |
869 | if (obj->separate_debug_objfile_backlink != NULL) | |
870 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink); | |
871 | ||
98a5dd13 DE |
872 | return 0; |
873 | } | |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
878 | /* Handle $sdir in libthread-db-search-path. | |
879 | Look for libthread_db in the system dirs, or wherever a plain | |
880 | dlopen(file_without_path) will look. | |
881 | The result is true for success. */ | |
882 | ||
883 | static int | |
884 | try_thread_db_load_from_sdir (void) | |
885 | { | |
886 | return try_thread_db_load (LIBTHREAD_DB_SO); | |
887 | } | |
888 | ||
889 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
890 | The result is true for success. */ | |
891 | ||
892 | static int | |
893 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
894 | { | |
05386e9e TT |
895 | struct cleanup *cleanup; |
896 | char *path; | |
897 | int result; | |
98a5dd13 | 898 | |
05386e9e TT |
899 | path = xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
900 | cleanup = make_cleanup (xfree, path); | |
98a5dd13 DE |
901 | |
902 | memcpy (path, dir, dir_len); | |
903 | path[dir_len] = '/'; | |
904 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
05386e9e TT |
905 | result = try_thread_db_load (path); |
906 | ||
907 | do_cleanups (cleanup); | |
908 | return result; | |
98a5dd13 DE |
909 | } |
910 | ||
17a37d48 | 911 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
912 | to work on current inferior. |
913 | The result is true for success. */ | |
17a37d48 PP |
914 | |
915 | static int | |
916 | thread_db_load_search (void) | |
917 | { | |
17a37d48 PP |
918 | const char *search_path = libthread_db_search_path; |
919 | int rc = 0; | |
920 | ||
921 | while (*search_path) | |
922 | { | |
923 | const char *end = strchr (search_path, ':'); | |
98a5dd13 DE |
924 | const char *this_dir = search_path; |
925 | size_t this_dir_len; | |
e0881a8e | 926 | |
17a37d48 PP |
927 | if (end) |
928 | { | |
98a5dd13 DE |
929 | this_dir_len = end - search_path; |
930 | search_path += this_dir_len + 1; | |
17a37d48 PP |
931 | } |
932 | else | |
933 | { | |
98a5dd13 DE |
934 | this_dir_len = strlen (this_dir); |
935 | search_path += this_dir_len; | |
936 | } | |
17a37d48 | 937 | |
98a5dd13 DE |
938 | if (this_dir_len == sizeof ("$pdir") - 1 |
939 | && strncmp (this_dir, "$pdir", this_dir_len) == 0) | |
940 | { | |
941 | if (try_thread_db_load_from_pdir ()) | |
942 | { | |
943 | rc = 1; | |
944 | break; | |
945 | } | |
17a37d48 | 946 | } |
98a5dd13 DE |
947 | else if (this_dir_len == sizeof ("$sdir") - 1 |
948 | && strncmp (this_dir, "$sdir", this_dir_len) == 0) | |
949 | { | |
950 | if (try_thread_db_load_from_sdir ()) | |
951 | { | |
952 | rc = 1; | |
953 | break; | |
954 | } | |
955 | } | |
956 | else | |
17a37d48 | 957 | { |
98a5dd13 DE |
958 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
959 | { | |
960 | rc = 1; | |
961 | break; | |
962 | } | |
17a37d48 PP |
963 | } |
964 | } | |
98a5dd13 DE |
965 | |
966 | if (libthread_db_debug) | |
967 | printf_unfiltered (_("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
968 | return rc; |
969 | } | |
970 | ||
98a5dd13 DE |
971 | /* Return non-zero if the inferior has a libpthread. */ |
972 | ||
973 | static int | |
974 | has_libpthread (void) | |
975 | { | |
976 | struct objfile *obj; | |
977 | ||
978 | ALL_OBJFILES (obj) | |
979 | if (libpthread_name_p (obj->name)) | |
980 | return 1; | |
981 | ||
982 | return 0; | |
983 | } | |
984 | ||
17a37d48 | 985 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 986 | Return 1 on success. */ |
17a37d48 PP |
987 | |
988 | static int | |
989 | thread_db_load (void) | |
990 | { | |
d90e17a7 | 991 | struct thread_db_info *info; |
17a37d48 | 992 | |
d90e17a7 PA |
993 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
994 | ||
995 | if (info != NULL) | |
17a37d48 PP |
996 | return 1; |
997 | ||
856d6f99 PA |
998 | /* Don't attempt to use thread_db on executables not running |
999 | yet. */ | |
1000 | if (!target_has_registers) | |
17a37d48 PP |
1001 | return 0; |
1002 | ||
1003 | /* Don't attempt to use thread_db for remote targets. */ | |
856d6f99 | 1004 | if (!(target_can_run (¤t_target) || core_bfd)) |
17a37d48 PP |
1005 | return 0; |
1006 | ||
1007 | if (thread_db_load_search ()) | |
1008 | return 1; | |
1009 | ||
98a5dd13 DE |
1010 | /* We couldn't find a libthread_db. |
1011 | If the inferior has a libpthread warn the user. */ | |
1012 | if (has_libpthread ()) | |
1013 | { | |
1014 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1015 | " library, thread debugging will not be available.")); | |
1016 | return 0; | |
17a37d48 | 1017 | } |
98a5dd13 | 1018 | |
17a37d48 PP |
1019 | /* Either this executable isn't using libpthread at all, or it is |
1020 | statically linked. Since we can't easily distinguish these two cases, | |
1021 | no warning is issued. */ | |
1022 | return 0; | |
1023 | } | |
1024 | ||
fb0e1ba7 | 1025 | static void |
12b6a110 | 1026 | disable_thread_event_reporting (struct thread_db_info *info) |
fb0e1ba7 | 1027 | { |
21e1bee4 | 1028 | if (info->td_ta_clear_event_p != NULL) |
12b6a110 PP |
1029 | { |
1030 | td_thr_events_t events; | |
fb0e1ba7 | 1031 | |
12b6a110 PP |
1032 | /* Set the process wide mask saying we aren't interested in any |
1033 | events anymore. */ | |
21e1bee4 PP |
1034 | td_event_fillset (&events); |
1035 | info->td_ta_clear_event_p (info->thread_agent, &events); | |
12b6a110 | 1036 | } |
fb0e1ba7 | 1037 | |
d90e17a7 PA |
1038 | info->td_create_bp_addr = 0; |
1039 | info->td_death_bp_addr = 0; | |
fb0e1ba7 MK |
1040 | } |
1041 | ||
1042 | static void | |
1043 | check_thread_signals (void) | |
1044 | { | |
21bf60fe | 1045 | if (!thread_signals) |
fb0e1ba7 MK |
1046 | { |
1047 | sigset_t mask; | |
1048 | int i; | |
1049 | ||
669211f5 | 1050 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1051 | sigemptyset (&thread_stop_set); |
1052 | sigemptyset (&thread_print_set); | |
1053 | ||
b9569773 | 1054 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1055 | { |
1056 | if (sigismember (&mask, i)) | |
1057 | { | |
1058 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
1059 | sigaddset (&thread_stop_set, i); | |
1060 | if (signal_print_update (target_signal_from_host (i), 0)) | |
1061 | sigaddset (&thread_print_set, i); | |
1062 | thread_signals = 1; | |
1063 | } | |
1064 | } | |
1065 | } | |
fb0e1ba7 MK |
1066 | } |
1067 | ||
0ec9a092 DJ |
1068 | /* Check whether thread_db is usable. This function is called when |
1069 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1070 | and when new shared libraries are loaded into a running process. */ | |
1071 | ||
1072 | void | |
1073 | check_for_thread_db (void) | |
fb0e1ba7 | 1074 | { |
b5057acd | 1075 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1076 | if (!thread_db_load ()) |
b5057acd | 1077 | return; |
0ec9a092 DJ |
1078 | } |
1079 | ||
1080 | static void | |
1081 | thread_db_new_objfile (struct objfile *objfile) | |
1082 | { | |
d90e17a7 PA |
1083 | /* This observer must always be called with inferior_ptid set |
1084 | correctly. */ | |
1085 | ||
0ec9a092 DJ |
1086 | if (objfile != NULL) |
1087 | check_for_thread_db (); | |
fb0e1ba7 MK |
1088 | } |
1089 | ||
a2f23071 DJ |
1090 | /* Attach to a new thread. This function is called when we receive a |
1091 | TD_CREATE event or when we iterate over all threads and find one | |
02c6c942 | 1092 | that wasn't already in our list. Returns true on success. */ |
a2f23071 | 1093 | |
02c6c942 | 1094 | static int |
39f77062 | 1095 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 1096 | const td_thrinfo_t *ti_p) |
fb0e1ba7 | 1097 | { |
17faa917 DJ |
1098 | struct private_thread_info *private; |
1099 | struct thread_info *tp = NULL; | |
fb0e1ba7 | 1100 | td_err_e err; |
d90e17a7 | 1101 | struct thread_db_info *info; |
fb0e1ba7 | 1102 | |
a2f23071 DJ |
1103 | /* If we're being called after a TD_CREATE event, we may already |
1104 | know about this thread. There are two ways this can happen. We | |
1105 | may have iterated over all threads between the thread creation | |
1106 | and the TD_CREATE event, for instance when the user has issued | |
1107 | the `info threads' command before the SIGTRAP for hitting the | |
1108 | thread creation breakpoint was reported. Alternatively, the | |
1109 | thread may have exited and a new one been created with the same | |
1110 | thread ID. In the first case we don't need to do anything; in | |
1111 | the second case we should discard information about the dead | |
1112 | thread and attach to the new one. */ | |
1113 | if (in_thread_list (ptid)) | |
1114 | { | |
e09875d4 | 1115 | tp = find_thread_ptid (ptid); |
a2f23071 DJ |
1116 | gdb_assert (tp != NULL); |
1117 | ||
17faa917 DJ |
1118 | /* If tp->private is NULL, then GDB is already attached to this |
1119 | thread, but we do not know anything about it. We can learn | |
1120 | about it here. This can only happen if we have some other | |
1121 | way besides libthread_db to notice new threads (i.e. | |
1122 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread | |
1123 | exit, so this can not be a stale thread recreated with the | |
1124 | same ID. */ | |
1125 | if (tp->private != NULL) | |
1126 | { | |
1127 | if (!tp->private->dying) | |
02c6c942 | 1128 | return 0; |
a2f23071 | 1129 | |
17faa917 DJ |
1130 | delete_thread (ptid); |
1131 | tp = NULL; | |
1132 | } | |
a2f23071 DJ |
1133 | } |
1134 | ||
856d6f99 PA |
1135 | if (target_has_execution) |
1136 | check_thread_signals (); | |
fb0e1ba7 | 1137 | |
9ee57c33 | 1138 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
02c6c942 | 1139 | return 0; /* A zombie thread -- do not attach. */ |
9ee57c33 DJ |
1140 | |
1141 | /* Under GNU/Linux, we have to attach to each and every thread. */ | |
856d6f99 | 1142 | if (target_has_execution |
84636d28 PA |
1143 | && tp == NULL) |
1144 | { | |
1145 | int res; | |
1146 | ||
1147 | res = lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid))); | |
1148 | if (res < 0) | |
1149 | { | |
1150 | /* Error, stop iterating. */ | |
1151 | return 0; | |
1152 | } | |
1153 | else if (res > 0) | |
1154 | { | |
1155 | /* Pretend this thread doesn't exist yet, and keep | |
1156 | iterating. */ | |
1157 | return 1; | |
1158 | } | |
1159 | ||
1160 | /* Otherwise, we sucessfully attached to the thread. */ | |
1161 | } | |
9ee57c33 | 1162 | |
17faa917 DJ |
1163 | /* Construct the thread's private data. */ |
1164 | private = xmalloc (sizeof (struct private_thread_info)); | |
1165 | memset (private, 0, sizeof (struct private_thread_info)); | |
1166 | ||
1167 | /* A thread ID of zero may mean the thread library has not initialized | |
1168 | yet. But we shouldn't even get here if that's the case. FIXME: | |
1169 | if we change GDB to always have at least one thread in the thread | |
1170 | list this will have to go somewhere else; maybe private == NULL | |
1171 | until the thread_db target claims it. */ | |
1172 | gdb_assert (ti_p->ti_tid != 0); | |
1173 | private->th = *th_p; | |
1174 | private->tid = ti_p->ti_tid; | |
1175 | ||
fb0e1ba7 | 1176 | /* Add the thread to GDB's thread list. */ |
17faa917 | 1177 | if (tp == NULL) |
2e456570 | 1178 | add_thread_with_info (ptid, private); |
17faa917 DJ |
1179 | else |
1180 | tp->private = private; | |
5365276c | 1181 | |
d90e17a7 PA |
1182 | info = get_thread_db_info (GET_PID (ptid)); |
1183 | ||
856d6f99 PA |
1184 | /* Enable thread event reporting for this thread, except when |
1185 | debugging a core file. */ | |
1186 | if (target_has_execution) | |
1187 | { | |
1188 | err = info->td_thr_event_enable_p (th_p, 1); | |
1189 | if (err != TD_OK) | |
1190 | error (_("Cannot enable thread event reporting for %s: %s"), | |
1191 | target_pid_to_str (ptid), thread_db_err_str (err)); | |
1192 | } | |
1193 | ||
02c6c942 | 1194 | return 1; |
fb0e1ba7 MK |
1195 | } |
1196 | ||
1197 | static void | |
17faa917 | 1198 | detach_thread (ptid_t ptid) |
fb0e1ba7 | 1199 | { |
a2f23071 DJ |
1200 | struct thread_info *thread_info; |
1201 | ||
a2f23071 DJ |
1202 | /* Don't delete the thread now, because it still reports as active |
1203 | until it has executed a few instructions after the event | |
1204 | breakpoint - if we deleted it now, "info threads" would cause us | |
1205 | to re-attach to it. Just mark it as having had a TD_DEATH | |
1206 | event. This means that we won't delete it from our thread list | |
1207 | until we notice that it's dead (via prune_threads), or until | |
17faa917 DJ |
1208 | something re-uses its thread ID. We'll report the thread exit |
1209 | when the underlying LWP dies. */ | |
e09875d4 | 1210 | thread_info = find_thread_ptid (ptid); |
17faa917 | 1211 | gdb_assert (thread_info != NULL && thread_info->private != NULL); |
a2f23071 | 1212 | thread_info->private->dying = 1; |
fb0e1ba7 MK |
1213 | } |
1214 | ||
1215 | static void | |
136d6dae | 1216 | thread_db_detach (struct target_ops *ops, char *args, int from_tty) |
fb0e1ba7 | 1217 | { |
117de6a9 | 1218 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1219 | struct thread_db_info *info; |
117de6a9 | 1220 | |
d90e17a7 | 1221 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
c194fbe1 | 1222 | |
d90e17a7 PA |
1223 | if (info) |
1224 | { | |
856d6f99 PA |
1225 | if (target_has_execution) |
1226 | { | |
1227 | disable_thread_event_reporting (info); | |
1228 | ||
1229 | /* Delete the old thread event breakpoints. Note that | |
1230 | unlike when mourning, we can remove them here because | |
1231 | there's still a live inferior to poke at. In any case, | |
1232 | GDB will not try to insert anything in the inferior when | |
1233 | removing a breakpoint. */ | |
1234 | remove_thread_event_breakpoints (); | |
1235 | } | |
d90e17a7 PA |
1236 | |
1237 | delete_thread_db_info (GET_PID (inferior_ptid)); | |
1238 | } | |
4105de34 | 1239 | |
7a7d3353 | 1240 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1241 | |
1242 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1243 | ||
1244 | /* If there are no more processes using libpthread, detach the | |
1245 | thread_db target ops. */ | |
1246 | if (!thread_db_list) | |
1247 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1248 | } |
1249 | ||
fb0e1ba7 MK |
1250 | /* Check if PID is currently stopped at the location of a thread event |
1251 | breakpoint location. If it is, read the event message and act upon | |
1252 | the event. */ | |
1253 | ||
1254 | static void | |
39f77062 | 1255 | check_event (ptid_t ptid) |
fb0e1ba7 | 1256 | { |
515630c5 UW |
1257 | struct regcache *regcache = get_thread_regcache (ptid); |
1258 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
fb0e1ba7 MK |
1259 | td_event_msg_t msg; |
1260 | td_thrinfo_t ti; | |
1261 | td_err_e err; | |
1262 | CORE_ADDR stop_pc; | |
4d9850d3 | 1263 | int loop = 0; |
d90e17a7 PA |
1264 | struct thread_db_info *info; |
1265 | ||
1266 | info = get_thread_db_info (GET_PID (ptid)); | |
fb0e1ba7 MK |
1267 | |
1268 | /* Bail out early if we're not at a thread event breakpoint. */ | |
515630c5 UW |
1269 | stop_pc = regcache_read_pc (regcache) |
1270 | - gdbarch_decr_pc_after_break (gdbarch); | |
d90e17a7 PA |
1271 | if (stop_pc != info->td_create_bp_addr |
1272 | && stop_pc != info->td_death_bp_addr) | |
fb0e1ba7 MK |
1273 | return; |
1274 | ||
4c28f408 | 1275 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1276 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
1277 | |
1278 | /* If we have only looked at the first thread before libpthread was | |
1279 | initialized, we may not know its thread ID yet. Make sure we do | |
1280 | before we add another thread to the list. */ | |
d90e17a7 PA |
1281 | if (!have_threads (ptid)) |
1282 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 1283 | |
4d9850d3 JJ |
1284 | /* If we are at a create breakpoint, we do not know what new lwp |
1285 | was created and cannot specifically locate the event message for it. | |
1286 | We have to call td_ta_event_getmsg() to get | |
1287 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 1288 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 1289 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
1290 | This guarantees we will process the correct message before continuing |
1291 | from the breakpoint. | |
4d9850d3 JJ |
1292 | |
1293 | Currently, death events are not enabled. If they are enabled, | |
1294 | the death event can use the td_thr_event_getmsg() interface to | |
1295 | get the message specifically for that lwp and avoid looping | |
1296 | below. */ | |
1297 | ||
1298 | loop = 1; | |
1299 | ||
1300 | do | |
fb0e1ba7 | 1301 | { |
d90e17a7 | 1302 | err = info->td_ta_event_getmsg_p (info->thread_agent, &msg); |
4d9850d3 JJ |
1303 | if (err != TD_OK) |
1304 | { | |
1305 | if (err == TD_NOMSG) | |
1306 | return; | |
fb0e1ba7 | 1307 | |
8a3fe4f8 | 1308 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
1309 | thread_db_err_str (err)); |
1310 | } | |
fb0e1ba7 | 1311 | |
d90e17a7 | 1312 | err = info->td_thr_get_info_p (msg.th_p, &ti); |
4d9850d3 | 1313 | if (err != TD_OK) |
8a3fe4f8 | 1314 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 1315 | |
17faa917 | 1316 | ptid = ptid_build (GET_PID (ptid), ti.ti_lid, 0); |
fb0e1ba7 | 1317 | |
4d9850d3 JJ |
1318 | switch (msg.event) |
1319 | { | |
1320 | case TD_CREATE: | |
a2f23071 DJ |
1321 | /* Call attach_thread whether or not we already know about a |
1322 | thread with this thread ID. */ | |
93815fbf | 1323 | attach_thread (ptid, msg.th_p, &ti); |
fb0e1ba7 | 1324 | |
4d9850d3 | 1325 | break; |
fb0e1ba7 | 1326 | |
4d9850d3 | 1327 | case TD_DEATH: |
fb0e1ba7 | 1328 | |
4d9850d3 | 1329 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 1330 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 1331 | |
17faa917 | 1332 | detach_thread (ptid); |
fb0e1ba7 | 1333 | |
4d9850d3 | 1334 | break; |
fb0e1ba7 | 1335 | |
4d9850d3 | 1336 | default: |
8a3fe4f8 | 1337 | error (_("Spurious thread event.")); |
4d9850d3 | 1338 | } |
fb0e1ba7 | 1339 | } |
4d9850d3 | 1340 | while (loop); |
fb0e1ba7 MK |
1341 | } |
1342 | ||
39f77062 | 1343 | static ptid_t |
117de6a9 | 1344 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1345 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1346 | int options) | |
fb0e1ba7 | 1347 | { |
d90e17a7 | 1348 | struct thread_db_info *info; |
117de6a9 PA |
1349 | struct target_ops *beneath = find_target_beneath (ops); |
1350 | ||
47608cb1 | 1351 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1352 | |
b84876c2 PA |
1353 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1354 | return ptid; | |
1355 | ||
1111f4aa | 1356 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1357 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1358 | return ptid; | |
fb0e1ba7 | 1359 | |
d90e17a7 PA |
1360 | info = get_thread_db_info (GET_PID (ptid)); |
1361 | ||
1362 | /* If this process isn't using thread_db, we're done. */ | |
1363 | if (info == NULL) | |
1364 | return ptid; | |
1365 | ||
3f64f7b1 DJ |
1366 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1367 | { | |
d90e17a7 PA |
1368 | /* New image, it may or may not end up using thread_db. Assume |
1369 | not unless we find otherwise. */ | |
1370 | delete_thread_db_info (GET_PID (ptid)); | |
1371 | if (!thread_db_list) | |
1372 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1373 | |
6c95b8df PA |
1374 | /* Thread event breakpoints are deleted by |
1375 | update_breakpoints_after_exec. */ | |
1376 | ||
49fd4a42 | 1377 | return ptid; |
3f64f7b1 DJ |
1378 | } |
1379 | ||
4105de34 DJ |
1380 | /* If we do not know about the main thread yet, this would be a good time to |
1381 | find it. */ | |
d90e17a7 PA |
1382 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid)) |
1383 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1384 | |
fb0e1ba7 MK |
1385 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
1386 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
1387 | /* Check for a thread event. */ | |
39f77062 | 1388 | check_event (ptid); |
fb0e1ba7 | 1389 | |
d90e17a7 | 1390 | if (have_threads (ptid)) |
4105de34 DJ |
1391 | { |
1392 | /* Change ptids back into the higher level PID + TID format. If | |
1393 | the thread is dead and no longer on the thread list, we will | |
1394 | get back a dead ptid. This can occur if the thread death | |
1395 | event gets postponed by other simultaneous events. In such a | |
1396 | case, we want to just ignore the event and continue on. */ | |
1397 | ||
4105de34 DJ |
1398 | ptid = thread_from_lwp (ptid); |
1399 | if (GET_PID (ptid) == -1) | |
1400 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
1401 | } | |
fb0e1ba7 | 1402 | |
b9b5d7ea | 1403 | return ptid; |
fb0e1ba7 MK |
1404 | } |
1405 | ||
fb0e1ba7 | 1406 | static void |
136d6dae | 1407 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1408 | { |
117de6a9 PA |
1409 | struct target_ops *target_beneath = find_target_beneath (ops); |
1410 | ||
d90e17a7 | 1411 | delete_thread_db_info (GET_PID (inferior_ptid)); |
fb0e1ba7 | 1412 | |
d90e17a7 PA |
1413 | target_beneath->to_mourn_inferior (target_beneath); |
1414 | ||
6c95b8df PA |
1415 | /* Delete the old thread event breakpoints. Do this after mourning |
1416 | the inferior, so that we don't try to uninsert them. */ | |
1417 | remove_thread_event_breakpoints (); | |
1418 | ||
b26a6851 | 1419 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1420 | if (!thread_db_list) |
1421 | unpush_target (ops); | |
fb0e1ba7 MK |
1422 | } |
1423 | ||
02c6c942 PP |
1424 | struct callback_data |
1425 | { | |
1426 | struct thread_db_info *info; | |
1427 | int new_threads; | |
1428 | }; | |
1429 | ||
fb0e1ba7 MK |
1430 | static int |
1431 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1432 | { | |
1433 | td_thrinfo_t ti; | |
1434 | td_err_e err; | |
39f77062 | 1435 | ptid_t ptid; |
403fe197 | 1436 | struct thread_info *tp; |
02c6c942 PP |
1437 | struct callback_data *cb_data = data; |
1438 | struct thread_db_info *info = cb_data->info; | |
fb0e1ba7 | 1439 | |
d90e17a7 | 1440 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1441 | if (err != TD_OK) |
8a3fe4f8 | 1442 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1443 | thread_db_err_str (err)); |
fb0e1ba7 | 1444 | |
21bf60fe MK |
1445 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
1446 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 1447 | |
254f582e | 1448 | if (ti.ti_tid == 0) |
4105de34 DJ |
1449 | { |
1450 | /* A thread ID of zero means that this is the main thread, but | |
1451 | glibc has not yet initialized thread-local storage and the | |
1452 | pthread library. We do not know what the thread's TID will | |
1453 | be yet. Just enable event reporting and otherwise ignore | |
1454 | it. */ | |
1455 | ||
4d062f1a PA |
1456 | /* In that case, we're not stopped in a fork syscall and don't |
1457 | need this glibc bug workaround. */ | |
1458 | info->need_stale_parent_threads_check = 0; | |
1459 | ||
254f582e JK |
1460 | if (target_has_execution) |
1461 | { | |
1462 | err = info->td_thr_event_enable_p (th_p, 1); | |
1463 | if (err != TD_OK) | |
1464 | error (_("Cannot enable thread event reporting for LWP %d: %s"), | |
1465 | (int) ti.ti_lid, thread_db_err_str (err)); | |
1466 | } | |
4105de34 DJ |
1467 | |
1468 | return 0; | |
1469 | } | |
1470 | ||
4d062f1a PA |
1471 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1472 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1473 | avoid doing the work if we know we don't have to. */ | |
1474 | if (info->need_stale_parent_threads_check) | |
1475 | { | |
1476 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1477 | |
4d062f1a PA |
1478 | if (tgid != -1 && tgid != info->pid) |
1479 | return 0; | |
1480 | } | |
1481 | ||
1482 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1483 | tp = find_thread_ptid (ptid); |
403fe197 | 1484 | if (tp == NULL || tp->private == NULL) |
02c6c942 PP |
1485 | { |
1486 | if (attach_thread (ptid, th_p, &ti)) | |
1487 | cb_data->new_threads += 1; | |
1488 | else | |
1489 | /* Problem attaching this thread; perhaps it exited before we | |
1490 | could attach it? | |
1491 | This could mean that the thread list inside glibc itself is in | |
1492 | inconsistent state, and libthread_db could go on looping forever | |
1493 | (observed with glibc-2.3.6). To prevent that, terminate | |
1494 | iteration: thread_db_find_new_threads_2 will retry. */ | |
1495 | return 1; | |
1496 | } | |
fb0e1ba7 MK |
1497 | |
1498 | return 0; | |
1499 | } | |
1500 | ||
02c6c942 PP |
1501 | /* Helper for thread_db_find_new_threads_2. |
1502 | Returns number of new threads found. */ | |
1503 | ||
1504 | static int | |
1505 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1506 | td_err_e *errp) |
02c6c942 PP |
1507 | { |
1508 | volatile struct gdb_exception except; | |
1509 | struct callback_data data; | |
fb169834 | 1510 | td_err_e err = TD_ERR; |
02c6c942 PP |
1511 | |
1512 | data.info = info; | |
1513 | data.new_threads = 0; | |
1514 | ||
1515 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
1516 | { | |
1517 | /* Iterate over all user-space threads to discover new threads. */ | |
1518 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1519 | find_new_threads_callback, | |
1520 | &data, | |
1521 | TD_THR_ANY_STATE, | |
1522 | TD_THR_LOWEST_PRIORITY, | |
1523 | TD_SIGNO_MASK, | |
1524 | TD_THR_ANY_USER_FLAGS); | |
1525 | } | |
1526 | ||
02d868e8 | 1527 | if (libthread_db_debug) |
02c6c942 PP |
1528 | { |
1529 | if (except.reason < 0) | |
1530 | exception_fprintf (gdb_stderr, except, | |
1531 | "Warning: find_new_threads_once: "); | |
1532 | ||
1533 | printf_filtered (_("Found %d new threads in iteration %d.\n"), | |
1534 | data.new_threads, iteration); | |
1535 | } | |
1536 | ||
1537 | if (errp != NULL) | |
1538 | *errp = err; | |
1539 | ||
1540 | return data.new_threads; | |
1541 | } | |
1542 | ||
4c28f408 | 1543 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1544 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1545 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1546 | |
fb0e1ba7 | 1547 | static void |
02c6c942 | 1548 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 MK |
1549 | { |
1550 | td_err_e err; | |
d90e17a7 PA |
1551 | struct thread_db_info *info; |
1552 | int pid = ptid_get_pid (ptid); | |
02c6c942 | 1553 | int i, loop; |
4c28f408 | 1554 | |
d90e17a7 PA |
1555 | info = get_thread_db_info (GET_PID (ptid)); |
1556 | ||
4c28f408 | 1557 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1558 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1559 | |
1560 | if (until_no_new) | |
1561 | { | |
1562 | /* Require 4 successive iterations which do not find any new threads. | |
1563 | The 4 is a heuristic: there is an inherent race here, and I have | |
1564 | seen that 2 iterations in a row are not always sufficient to | |
1565 | "capture" all threads. */ | |
1566 | for (i = 0, loop = 0; loop < 4; ++i, ++loop) | |
1567 | if (find_new_threads_once (info, i, NULL) != 0) | |
1568 | /* Found some new threads. Restart the loop from beginning. */ | |
1569 | loop = -1; | |
1570 | } | |
1571 | else | |
1572 | { | |
02c6c942 PP |
1573 | find_new_threads_once (info, 0, &err); |
1574 | if (err != TD_OK) | |
1575 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
1576 | } | |
fb0e1ba7 MK |
1577 | } |
1578 | ||
02c6c942 PP |
1579 | static void |
1580 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1581 | { | |
1582 | thread_db_find_new_threads_2 (ptid, 0); | |
1583 | } | |
1584 | ||
dc146f7c VP |
1585 | static int |
1586 | update_thread_core (struct lwp_info *info, void *closure) | |
1587 | { | |
1588 | info->core = linux_nat_core_of_thread_1 (info->ptid); | |
1589 | return 0; | |
1590 | } | |
02c6c942 | 1591 | |
28439f5e PA |
1592 | static void |
1593 | thread_db_find_new_threads (struct target_ops *ops) | |
1594 | { | |
d90e17a7 | 1595 | struct thread_db_info *info; |
c65b3e0d | 1596 | struct inferior *inf; |
d90e17a7 | 1597 | |
c65b3e0d PA |
1598 | ALL_INFERIORS (inf) |
1599 | { | |
1600 | struct thread_info *thread; | |
d90e17a7 | 1601 | |
c65b3e0d PA |
1602 | if (inf->pid == 0) |
1603 | continue; | |
d90e17a7 | 1604 | |
c65b3e0d PA |
1605 | info = get_thread_db_info (inf->pid); |
1606 | if (info == NULL) | |
1607 | continue; | |
1608 | ||
1609 | thread = any_live_thread_of_process (inf->pid); | |
1610 | if (thread == NULL || thread->executing) | |
1611 | continue; | |
1612 | ||
1613 | thread_db_find_new_threads_1 (thread->ptid); | |
1614 | } | |
dc146f7c | 1615 | |
856d6f99 PA |
1616 | if (target_has_execution) |
1617 | iterate_over_lwps (minus_one_ptid /* iterate over all */, | |
1618 | update_thread_core, NULL); | |
28439f5e PA |
1619 | } |
1620 | ||
fb0e1ba7 | 1621 | static char * |
117de6a9 | 1622 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1623 | { |
e09875d4 | 1624 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1625 | struct target_ops *beneath; |
17faa917 DJ |
1626 | |
1627 | if (thread_info != NULL && thread_info->private != NULL) | |
fb0e1ba7 MK |
1628 | { |
1629 | static char buf[64]; | |
17faa917 | 1630 | thread_t tid; |
fb0e1ba7 | 1631 | |
17faa917 | 1632 | tid = thread_info->private->tid; |
17faa917 DJ |
1633 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
1634 | tid, GET_LWP (ptid)); | |
fb0e1ba7 MK |
1635 | |
1636 | return buf; | |
1637 | } | |
1638 | ||
117de6a9 PA |
1639 | beneath = find_target_beneath (ops); |
1640 | if (beneath->to_pid_to_str (beneath, ptid)) | |
1641 | return beneath->to_pid_to_str (beneath, ptid); | |
fb0e1ba7 | 1642 | |
39f77062 | 1643 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1644 | } |
1645 | ||
28b17333 DJ |
1646 | /* Return a string describing the state of the thread specified by |
1647 | INFO. */ | |
1648 | ||
1649 | static char * | |
1650 | thread_db_extra_thread_info (struct thread_info *info) | |
1651 | { | |
17faa917 DJ |
1652 | if (info->private == NULL) |
1653 | return NULL; | |
1654 | ||
28b17333 DJ |
1655 | if (info->private->dying) |
1656 | return "Exiting"; | |
1657 | ||
1658 | return NULL; | |
1659 | } | |
1660 | ||
b2756930 KB |
1661 | /* Get the address of the thread local variable in load module LM which |
1662 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1663 | |
1664 | static CORE_ADDR | |
117de6a9 PA |
1665 | thread_db_get_thread_local_address (struct target_ops *ops, |
1666 | ptid_t ptid, | |
b2756930 | 1667 | CORE_ADDR lm, |
b4acd559 | 1668 | CORE_ADDR offset) |
3f47be5c | 1669 | { |
17faa917 | 1670 | struct thread_info *thread_info; |
117de6a9 | 1671 | struct target_ops *beneath; |
17faa917 | 1672 | |
4105de34 | 1673 | /* If we have not discovered any threads yet, check now. */ |
d90e17a7 PA |
1674 | if (!have_threads (ptid)) |
1675 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1676 | |
17faa917 | 1677 | /* Find the matching thread. */ |
e09875d4 | 1678 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1679 | |
17faa917 | 1680 | if (thread_info != NULL && thread_info->private != NULL) |
3f47be5c | 1681 | { |
3f47be5c | 1682 | td_err_e err; |
00f515da | 1683 | psaddr_t address; |
d90e17a7 PA |
1684 | struct thread_db_info *info; |
1685 | ||
1686 | info = get_thread_db_info (GET_PID (ptid)); | |
3f47be5c EZ |
1687 | |
1688 | /* glibc doesn't provide the needed interface. */ | |
d90e17a7 | 1689 | if (!info->td_thr_tls_get_addr_p) |
109c3e39 AC |
1690 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
1691 | _("No TLS library support")); | |
3f47be5c | 1692 | |
b2756930 KB |
1693 | /* Caller should have verified that lm != 0. */ |
1694 | gdb_assert (lm != 0); | |
3f47be5c | 1695 | |
3f47be5c | 1696 | /* Finally, get the address of the variable. */ |
00f515da DE |
1697 | /* Note the cast through uintptr_t: this interface only works if |
1698 | a target address fits in a psaddr_t, which is a host pointer. | |
1699 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
d90e17a7 | 1700 | err = info->td_thr_tls_get_addr_p (&thread_info->private->th, |
00f515da | 1701 | (psaddr_t)(uintptr_t) lm, |
d90e17a7 | 1702 | offset, &address); |
3f47be5c EZ |
1703 | |
1704 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1705 | /* The memory hasn't been allocated, yet. */ | |
1706 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1707 | /* Now, if libthread_db provided the initialization image's |
1708 | address, we *could* try to build a non-lvalue value from | |
1709 | the initialization image. */ | |
109c3e39 AC |
1710 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1711 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1712 | #endif |
1713 | ||
1714 | /* Something else went wrong. */ | |
1715 | if (err != TD_OK) | |
109c3e39 AC |
1716 | throw_error (TLS_GENERIC_ERROR, |
1717 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1718 | |
1719 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1720 | /* Do proper sign extension for the target. */ |
1721 | gdb_assert (exec_bfd); | |
1722 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1723 | ? (CORE_ADDR) (intptr_t) address | |
1724 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1725 | } |
1726 | ||
117de6a9 PA |
1727 | beneath = find_target_beneath (ops); |
1728 | if (beneath->to_get_thread_local_address) | |
1729 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); | |
93ad78a7 | 1730 | else |
109c3e39 AC |
1731 | throw_error (TLS_GENERIC_ERROR, |
1732 | _("TLS not supported on this target")); | |
3f47be5c EZ |
1733 | } |
1734 | ||
0ef643c8 JB |
1735 | /* Callback routine used to find a thread based on the TID part of |
1736 | its PTID. */ | |
1737 | ||
1738 | static int | |
1739 | thread_db_find_thread_from_tid (struct thread_info *thread, void *data) | |
1740 | { | |
1741 | long *tid = (long *) data; | |
1742 | ||
1743 | if (thread->private->tid == *tid) | |
1744 | return 1; | |
1745 | ||
1746 | return 0; | |
1747 | } | |
1748 | ||
1749 | /* Implement the to_get_ada_task_ptid target method for this target. */ | |
1750 | ||
1751 | static ptid_t | |
1752 | thread_db_get_ada_task_ptid (long lwp, long thread) | |
1753 | { | |
1754 | struct thread_info *thread_info; | |
1755 | ||
d90e17a7 | 1756 | thread_db_find_new_threads_1 (inferior_ptid); |
0ef643c8 JB |
1757 | thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread); |
1758 | ||
1759 | gdb_assert (thread_info != NULL); | |
1760 | ||
1761 | return (thread_info->ptid); | |
1762 | } | |
1763 | ||
4d062f1a PA |
1764 | static void |
1765 | thread_db_resume (struct target_ops *ops, | |
1766 | ptid_t ptid, int step, enum target_signal signo) | |
1767 | { | |
1768 | struct target_ops *beneath = find_target_beneath (ops); | |
1769 | struct thread_db_info *info; | |
1770 | ||
1771 | if (ptid_equal (ptid, minus_one_ptid)) | |
1772 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
1773 | else | |
1774 | info = get_thread_db_info (GET_PID (ptid)); | |
1775 | ||
1776 | /* This workaround is only needed for child fork lwps stopped in a | |
1777 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1778 | workaround can be disabled. */ | |
1779 | if (info) | |
1780 | info->need_stale_parent_threads_check = 0; | |
1781 | ||
1782 | beneath->to_resume (beneath, ptid, step, signo); | |
1783 | } | |
1784 | ||
fb0e1ba7 MK |
1785 | static void |
1786 | init_thread_db_ops (void) | |
1787 | { | |
1788 | thread_db_ops.to_shortname = "multi-thread"; | |
1789 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1790 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
1791 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 1792 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 1793 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 1794 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
fb0e1ba7 MK |
1795 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
1796 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1797 | thread_db_ops.to_stratum = thread_stratum; | |
1798 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1799 | thread_db_ops.to_get_thread_local_address |
1800 | = thread_db_get_thread_local_address; | |
28b17333 | 1801 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 1802 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 MK |
1803 | thread_db_ops.to_magic = OPS_MAGIC; |
1804 | } | |
1805 | ||
2c0b251b PA |
1806 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1807 | extern initialize_file_ftype _initialize_thread_db; | |
1808 | ||
fb0e1ba7 MK |
1809 | void |
1810 | _initialize_thread_db (void) | |
1811 | { | |
17a37d48 PP |
1812 | init_thread_db_ops (); |
1813 | add_target (&thread_db_ops); | |
1814 | ||
1815 | /* Defer loading of libthread_db.so until inferior is running. | |
1816 | This allows gdb to load correct libthread_db for a given | |
1817 | executable -- there could be mutiple versions of glibc, | |
1818 | compiled with LinuxThreads or NPTL, and until there is | |
1819 | a running inferior, we can't tell which libthread_db is | |
1777feb0 | 1820 | the correct one to load. */ |
17a37d48 PP |
1821 | |
1822 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1823 | ||
1824 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1825 | class_support, | |
1826 | &libthread_db_search_path, _("\ | |
1827 | Set search path for libthread_db."), _("\ | |
1828 | Show the current search path or libthread_db."), _("\ | |
1829 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
1830 | gdb itself.\n\ |
1831 | Its value is a colon (':') separate list of directories to search.\n\ | |
1832 | Setting the search path to an empty list resets it to its default value."), | |
1833 | set_libthread_db_search_path, | |
17a37d48 PP |
1834 | NULL, |
1835 | &setlist, &showlist); | |
02d868e8 PP |
1836 | |
1837 | add_setshow_zinteger_cmd ("libthread-db", class_maintenance, | |
1838 | &libthread_db_debug, _("\ | |
1839 | Set libthread-db debugging."), _("\ | |
1840 | Show libthread-db debugging."), _("\ | |
1841 | When non-zero, libthread-db debugging is enabled."), | |
1842 | NULL, | |
1843 | show_libthread_db_debug, | |
1844 | &setdebuglist, &showdebuglist); | |
1845 | ||
17a37d48 PP |
1846 | /* Add ourselves to objfile event chain. */ |
1847 | observer_attach_new_objfile (thread_db_new_objfile); | |
fb0e1ba7 | 1848 | } |