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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" |
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 | |
17faa917 DJ |
434 | /* This ptid comes from linux-nat.c, which should always fill in the |
435 | LWP. */ | |
436 | gdb_assert (GET_LWP (ptid) != 0); | |
fb0e1ba7 | 437 | |
d90e17a7 PA |
438 | info = get_thread_db_info (GET_PID (ptid)); |
439 | ||
4c28f408 | 440 | /* Access an lwp we know is stopped. */ |
d90e17a7 PA |
441 | info->proc_handle.ptid = ptid; |
442 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); | |
fb0e1ba7 | 443 | if (err != TD_OK) |
8a3fe4f8 | 444 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
39f77062 | 445 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 446 | |
b9b5d7ea JJ |
447 | /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the |
448 | event thread has already died. If another gdb interface has called | |
449 | thread_alive() previously, the thread won't be found on the thread list | |
450 | anymore. In that case, we don't want to process this ptid anymore | |
451 | to avoid the possibility of later treating it as a newly | |
452 | discovered thread id that we should add to the list. Thus, | |
453 | we return a -1 ptid which is also how the thread list marks a | |
454 | dead thread. */ | |
d90e17a7 PA |
455 | io.thread_db_info = info; |
456 | io.thread_info = NULL; | |
457 | if (thread_get_info_callback (&th, &io) == TD_THR_ZOMBIE | |
458 | && io.thread_info == NULL) | |
459 | return minus_one_ptid; | |
b9b5d7ea | 460 | |
17faa917 DJ |
461 | gdb_assert (ptid_get_tid (ptid) == 0); |
462 | return ptid; | |
fb0e1ba7 MK |
463 | } |
464 | \f | |
465 | ||
4c28f408 PA |
466 | /* Attach to lwp PTID, doing whatever else is required to have this |
467 | LWP under the debugger's control --- e.g., enabling event | |
468 | reporting. Returns true on success. */ | |
469 | int | |
470 | thread_db_attach_lwp (ptid_t ptid) | |
471 | { | |
472 | td_thrhandle_t th; | |
473 | td_thrinfo_t ti; | |
474 | td_err_e err; | |
d90e17a7 | 475 | struct thread_db_info *info; |
4c28f408 | 476 | |
d90e17a7 PA |
477 | info = get_thread_db_info (GET_PID (ptid)); |
478 | ||
479 | if (info == NULL) | |
4c28f408 PA |
480 | return 0; |
481 | ||
482 | /* This ptid comes from linux-nat.c, which should always fill in the | |
483 | LWP. */ | |
484 | gdb_assert (GET_LWP (ptid) != 0); | |
485 | ||
486 | /* Access an lwp we know is stopped. */ | |
d90e17a7 | 487 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
488 | |
489 | /* If we have only looked at the first thread before libpthread was | |
490 | initialized, we may not know its thread ID yet. Make sure we do | |
491 | before we add another thread to the list. */ | |
d90e17a7 PA |
492 | if (!have_threads (ptid)) |
493 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 494 | |
d90e17a7 | 495 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); |
4c28f408 PA |
496 | if (err != TD_OK) |
497 | /* Cannot find user-level thread. */ | |
498 | return 0; | |
499 | ||
d90e17a7 | 500 | err = info->td_thr_get_info_p (&th, &ti); |
4c28f408 PA |
501 | if (err != TD_OK) |
502 | { | |
503 | warning (_("Cannot get thread info: %s"), thread_db_err_str (err)); | |
504 | return 0; | |
505 | } | |
506 | ||
507 | attach_thread (ptid, &th, &ti); | |
508 | return 1; | |
509 | } | |
510 | ||
5220ea4c AC |
511 | static void * |
512 | verbose_dlsym (void *handle, const char *name) | |
513 | { | |
514 | void *sym = dlsym (handle, name); | |
515 | if (sym == NULL) | |
3e43a32a MS |
516 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
517 | name, dlerror ()); | |
5220ea4c AC |
518 | return sym; |
519 | } | |
520 | ||
cdbc0b18 | 521 | static td_err_e |
d90e17a7 | 522 | enable_thread_event (int event, CORE_ADDR *bp) |
24557e30 AC |
523 | { |
524 | td_notify_t notify; | |
cdbc0b18 | 525 | td_err_e err; |
d90e17a7 PA |
526 | struct thread_db_info *info; |
527 | ||
528 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
24557e30 | 529 | |
4c28f408 | 530 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 531 | info->proc_handle.ptid = inferior_ptid; |
4c28f408 | 532 | |
24557e30 | 533 | /* Get the breakpoint address for thread EVENT. */ |
d90e17a7 | 534 | err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify); |
24557e30 | 535 | if (err != TD_OK) |
cdbc0b18 | 536 | return err; |
24557e30 AC |
537 | |
538 | /* Set up the breakpoint. */ | |
16451949 AS |
539 | gdb_assert (exec_bfd); |
540 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
a97b0ac8 | 541 | (target_gdbarch, |
16451949 AS |
542 | /* Do proper sign extension for the target. */ |
543 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
544 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
545 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
546 | ¤t_target)); | |
a6d9a66e | 547 | create_thread_event_breakpoint (target_gdbarch, *bp); |
24557e30 | 548 | |
cdbc0b18 | 549 | return TD_OK; |
24557e30 AC |
550 | } |
551 | ||
fb0e1ba7 MK |
552 | static void |
553 | enable_thread_event_reporting (void) | |
554 | { | |
555 | td_thr_events_t events; | |
fb0e1ba7 | 556 | td_err_e err; |
a2f23071 DJ |
557 | #ifdef HAVE_GNU_LIBC_VERSION_H |
558 | const char *libc_version; | |
559 | int libc_major, libc_minor; | |
560 | #endif | |
d90e17a7 PA |
561 | struct thread_db_info *info; |
562 | ||
563 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
fb0e1ba7 MK |
564 | |
565 | /* We cannot use the thread event reporting facility if these | |
566 | functions aren't available. */ | |
d90e17a7 PA |
567 | if (info->td_ta_event_addr_p == NULL |
568 | || info->td_ta_set_event_p == NULL | |
569 | || info->td_ta_event_getmsg_p == NULL | |
570 | || info->td_thr_event_enable_p == NULL) | |
fb0e1ba7 MK |
571 | return; |
572 | ||
573 | /* Set the process wide mask saying which events we're interested in. */ | |
574 | td_event_emptyset (&events); | |
575 | td_event_addset (&events, TD_CREATE); | |
a2f23071 DJ |
576 | |
577 | #ifdef HAVE_GNU_LIBC_VERSION_H | |
34091d9b | 578 | /* The event reporting facility is broken for TD_DEATH events in |
2ef52e77 | 579 | glibc 2.1.3, so don't enable it if we have glibc but a lower |
34091d9b | 580 | version. */ |
a2f23071 DJ |
581 | libc_version = gnu_get_libc_version (); |
582 | if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 | |
583 | && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) | |
fb0e1ba7 | 584 | #endif |
a2f23071 | 585 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 | 586 | |
d90e17a7 | 587 | err = info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
588 | if (err != TD_OK) |
589 | { | |
8a3fe4f8 | 590 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
591 | thread_db_err_str (err)); |
592 | return; | |
593 | } | |
594 | ||
595 | /* Delete previous thread event breakpoints, if any. */ | |
596 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
597 | info->td_create_bp_addr = 0; |
598 | info->td_death_bp_addr = 0; | |
fb0e1ba7 | 599 | |
24557e30 | 600 | /* Set up the thread creation event. */ |
d90e17a7 | 601 | err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr); |
cdbc0b18 | 602 | if (err != TD_OK) |
fb0e1ba7 | 603 | { |
8a3fe4f8 | 604 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
605 | thread_db_err_str (err)); |
606 | return; | |
607 | } | |
608 | ||
24557e30 | 609 | /* Set up the thread death event. */ |
d90e17a7 | 610 | err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr); |
cdbc0b18 | 611 | if (err != TD_OK) |
fb0e1ba7 | 612 | { |
8a3fe4f8 | 613 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
614 | thread_db_err_str (err)); |
615 | return; | |
616 | } | |
fb0e1ba7 MK |
617 | } |
618 | ||
456b0e24 PP |
619 | /* Same as thread_db_find_new_threads_1, but silently ignore errors. */ |
620 | ||
621 | static void | |
622 | thread_db_find_new_threads_silently (ptid_t ptid) | |
623 | { | |
624 | volatile struct gdb_exception except; | |
625 | ||
626 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
627 | { | |
02c6c942 | 628 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
629 | } |
630 | ||
02d868e8 | 631 | if (except.reason < 0 && libthread_db_debug) |
e0881a8e MS |
632 | { |
633 | exception_fprintf (gdb_stderr, except, | |
634 | "Warning: thread_db_find_new_threads_silently: "); | |
635 | } | |
456b0e24 PP |
636 | } |
637 | ||
d90e17a7 PA |
638 | /* Lookup a library in which given symbol resides. |
639 | Note: this is looking in GDB process, not in the inferior. | |
640 | Returns library name, or NULL. */ | |
641 | ||
642 | static const char * | |
643 | dladdr_to_soname (const void *addr) | |
644 | { | |
645 | Dl_info info; | |
646 | ||
647 | if (dladdr (addr, &info) != 0) | |
648 | return info.dli_fname; | |
649 | return NULL; | |
650 | } | |
651 | ||
2471d008 | 652 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
653 | Return 1 on success. |
654 | Failure could happen if libthread_db does not have symbols we expect, | |
655 | or when it refuses to work with the current inferior (e.g. due to | |
656 | version mismatch between libthread_db and libpthread). */ | |
657 | ||
658 | static int | |
d90e17a7 | 659 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
660 | { |
661 | td_err_e err; | |
662 | ||
663 | /* Initialize pointers to the dynamic library functions we will use. | |
664 | Essential functions first. */ | |
665 | ||
d90e17a7 PA |
666 | info->td_init_p = verbose_dlsym (info->handle, "td_init"); |
667 | if (info->td_init_p == NULL) | |
17a37d48 PP |
668 | return 0; |
669 | ||
d90e17a7 | 670 | err = info->td_init_p (); |
17a37d48 PP |
671 | if (err != TD_OK) |
672 | { | |
3e43a32a MS |
673 | warning (_("Cannot initialize libthread_db: %s"), |
674 | thread_db_err_str (err)); | |
17a37d48 PP |
675 | return 0; |
676 | } | |
677 | ||
d90e17a7 PA |
678 | info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new"); |
679 | if (info->td_ta_new_p == NULL) | |
17a37d48 PP |
680 | return 0; |
681 | ||
682 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 683 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
684 | |
685 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 686 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
687 | if (err != TD_OK) |
688 | { | |
02d868e8 | 689 | if (libthread_db_debug) |
17a37d48 PP |
690 | printf_unfiltered (_("td_ta_new failed: %s\n"), |
691 | thread_db_err_str (err)); | |
692 | else | |
693 | switch (err) | |
694 | { | |
695 | case TD_NOLIBTHREAD: | |
696 | #ifdef THREAD_DB_HAS_TD_VERSION | |
697 | case TD_VERSION: | |
698 | #endif | |
699 | /* The errors above are not unexpected and silently ignored: | |
700 | they just mean we haven't found correct version of | |
701 | libthread_db yet. */ | |
702 | break; | |
703 | default: | |
704 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
705 | } | |
706 | return 0; | |
707 | } | |
708 | ||
d90e17a7 PA |
709 | info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr"); |
710 | if (info->td_ta_map_id2thr_p == NULL) | |
17a37d48 PP |
711 | return 0; |
712 | ||
3e43a32a MS |
713 | info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, |
714 | "td_ta_map_lwp2thr"); | |
d90e17a7 | 715 | if (info->td_ta_map_lwp2thr_p == NULL) |
17a37d48 PP |
716 | return 0; |
717 | ||
d90e17a7 PA |
718 | info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter"); |
719 | if (info->td_ta_thr_iter_p == NULL) | |
17a37d48 PP |
720 | return 0; |
721 | ||
d90e17a7 PA |
722 | info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate"); |
723 | if (info->td_thr_validate_p == NULL) | |
17a37d48 PP |
724 | return 0; |
725 | ||
d90e17a7 PA |
726 | info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info"); |
727 | if (info->td_thr_get_info_p == NULL) | |
17a37d48 PP |
728 | return 0; |
729 | ||
730 | /* These are not essential. */ | |
d90e17a7 PA |
731 | info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr"); |
732 | info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event"); | |
21e1bee4 | 733 | info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event"); |
d90e17a7 PA |
734 | info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); |
735 | info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); | |
736 | info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); | |
17a37d48 PP |
737 | |
738 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); | |
739 | ||
02d868e8 | 740 | if (libthread_db_debug || *libthread_db_search_path) |
d90e17a7 PA |
741 | { |
742 | const char *library; | |
17a37d48 | 743 | |
d90e17a7 PA |
744 | library = dladdr_to_soname (*info->td_ta_new_p); |
745 | if (library == NULL) | |
746 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 747 | |
d90e17a7 PA |
748 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
749 | library); | |
750 | } | |
17a37d48 | 751 | |
d90e17a7 PA |
752 | /* The thread library was detected. Activate the thread_db target |
753 | if this is the first process using it. */ | |
754 | if (thread_db_list->next == NULL) | |
755 | push_target (&thread_db_ops); | |
17a37d48 | 756 | |
856d6f99 PA |
757 | /* Enable event reporting, but not when debugging a core file. */ |
758 | if (target_has_execution) | |
759 | enable_thread_event_reporting (); | |
456b0e24 | 760 | |
099cb4fb | 761 | /* There appears to be a bug in glibc-2.3.6: calls to td_thr_get_info fail |
456b0e24 PP |
762 | with TD_ERR for statically linked executables if td_thr_get_info is |
763 | called before glibc has initialized itself. Silently ignore such | |
099cb4fb | 764 | errors, and let gdb enumerate threads again later. */ |
456b0e24 | 765 | thread_db_find_new_threads_silently (inferior_ptid); |
099cb4fb | 766 | |
d90e17a7 | 767 | return 1; |
17a37d48 PP |
768 | } |
769 | ||
770 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
771 | relative, or just LIBTHREAD_DB. */ | |
772 | ||
773 | static int | |
774 | try_thread_db_load (const char *library) | |
775 | { | |
776 | void *handle; | |
d90e17a7 | 777 | struct thread_db_info *info; |
17a37d48 | 778 | |
02d868e8 | 779 | if (libthread_db_debug) |
17a37d48 PP |
780 | printf_unfiltered (_("Trying host libthread_db library: %s.\n"), |
781 | library); | |
782 | handle = dlopen (library, RTLD_NOW); | |
783 | if (handle == NULL) | |
784 | { | |
02d868e8 | 785 | if (libthread_db_debug) |
17a37d48 PP |
786 | printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ()); |
787 | return 0; | |
788 | } | |
789 | ||
02d868e8 | 790 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
791 | { |
792 | void *td_init; | |
793 | ||
794 | td_init = dlsym (handle, "td_init"); | |
795 | if (td_init != NULL) | |
796 | { | |
797 | const char *const libpath = dladdr_to_soname (td_init); | |
798 | ||
799 | if (libpath != NULL) | |
800 | printf_unfiltered (_("Host %s resolved to: %s.\n"), | |
801 | library, libpath); | |
802 | } | |
803 | } | |
804 | ||
d90e17a7 PA |
805 | info = add_thread_db_info (handle); |
806 | ||
807 | if (try_thread_db_load_1 (info)) | |
17a37d48 PP |
808 | return 1; |
809 | ||
810 | /* This library "refused" to work on current inferior. */ | |
d90e17a7 | 811 | delete_thread_db_info (GET_PID (inferior_ptid)); |
17a37d48 PP |
812 | return 0; |
813 | } | |
814 | ||
98a5dd13 DE |
815 | /* Handle $pdir in libthread-db-search-path. |
816 | Look for libthread_db in the directory of libpthread. | |
817 | The result is true for success. */ | |
818 | ||
819 | static int | |
820 | try_thread_db_load_from_pdir (void) | |
821 | { | |
822 | struct objfile *obj; | |
823 | ||
824 | ALL_OBJFILES (obj) | |
825 | if (libpthread_name_p (obj->name)) | |
826 | { | |
827 | char path[PATH_MAX], *cp; | |
828 | ||
829 | gdb_assert (strlen (obj->name) < sizeof (path)); | |
830 | strcpy (path, obj->name); | |
831 | cp = strrchr (path, '/'); | |
832 | ||
833 | if (cp == NULL) | |
834 | { | |
835 | warning (_("Expected absolute pathname for libpthread in the" | |
836 | " inferior, but got %s."), path); | |
837 | } | |
838 | else if (cp + 1 + strlen (LIBTHREAD_DB_SO) + 1 > path + sizeof (path)) | |
839 | { | |
840 | warning (_("Unexpected: path to libpthread in the inferior is" | |
841 | " too long: %s"), path); | |
842 | } | |
843 | else | |
844 | { | |
845 | strcpy (cp + 1, LIBTHREAD_DB_SO); | |
846 | if (try_thread_db_load (path)) | |
847 | return 1; | |
848 | } | |
849 | return 0; | |
850 | } | |
851 | ||
852 | return 0; | |
853 | } | |
854 | ||
855 | /* Handle $sdir in libthread-db-search-path. | |
856 | Look for libthread_db in the system dirs, or wherever a plain | |
857 | dlopen(file_without_path) will look. | |
858 | The result is true for success. */ | |
859 | ||
860 | static int | |
861 | try_thread_db_load_from_sdir (void) | |
862 | { | |
863 | return try_thread_db_load (LIBTHREAD_DB_SO); | |
864 | } | |
865 | ||
866 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
867 | The result is true for success. */ | |
868 | ||
869 | static int | |
870 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
871 | { | |
872 | char path[PATH_MAX]; | |
873 | ||
874 | if (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
875 | { | |
876 | char *cp = xmalloc (dir_len + 1); | |
877 | ||
878 | memcpy (cp, dir, dir_len); | |
879 | cp[dir_len] = '\0'; | |
880 | warning (_("libthread-db-search-path component too long," | |
881 | " ignored: %s."), cp); | |
882 | xfree (cp); | |
883 | return 0; | |
884 | } | |
885 | ||
886 | memcpy (path, dir, dir_len); | |
887 | path[dir_len] = '/'; | |
888 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
889 | return try_thread_db_load (path); | |
890 | } | |
891 | ||
17a37d48 | 892 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
893 | to work on current inferior. |
894 | The result is true for success. */ | |
17a37d48 PP |
895 | |
896 | static int | |
897 | thread_db_load_search (void) | |
898 | { | |
17a37d48 PP |
899 | const char *search_path = libthread_db_search_path; |
900 | int rc = 0; | |
901 | ||
902 | while (*search_path) | |
903 | { | |
904 | const char *end = strchr (search_path, ':'); | |
98a5dd13 DE |
905 | const char *this_dir = search_path; |
906 | size_t this_dir_len; | |
e0881a8e | 907 | |
17a37d48 PP |
908 | if (end) |
909 | { | |
98a5dd13 DE |
910 | this_dir_len = end - search_path; |
911 | search_path += this_dir_len + 1; | |
17a37d48 PP |
912 | } |
913 | else | |
914 | { | |
98a5dd13 DE |
915 | this_dir_len = strlen (this_dir); |
916 | search_path += this_dir_len; | |
917 | } | |
17a37d48 | 918 | |
98a5dd13 DE |
919 | if (this_dir_len == sizeof ("$pdir") - 1 |
920 | && strncmp (this_dir, "$pdir", this_dir_len) == 0) | |
921 | { | |
922 | if (try_thread_db_load_from_pdir ()) | |
923 | { | |
924 | rc = 1; | |
925 | break; | |
926 | } | |
17a37d48 | 927 | } |
98a5dd13 DE |
928 | else if (this_dir_len == sizeof ("$sdir") - 1 |
929 | && strncmp (this_dir, "$sdir", this_dir_len) == 0) | |
930 | { | |
931 | if (try_thread_db_load_from_sdir ()) | |
932 | { | |
933 | rc = 1; | |
934 | break; | |
935 | } | |
936 | } | |
937 | else | |
17a37d48 | 938 | { |
98a5dd13 DE |
939 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
940 | { | |
941 | rc = 1; | |
942 | break; | |
943 | } | |
17a37d48 PP |
944 | } |
945 | } | |
98a5dd13 DE |
946 | |
947 | if (libthread_db_debug) | |
948 | printf_unfiltered (_("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
949 | return rc; |
950 | } | |
951 | ||
98a5dd13 DE |
952 | /* Return non-zero if the inferior has a libpthread. */ |
953 | ||
954 | static int | |
955 | has_libpthread (void) | |
956 | { | |
957 | struct objfile *obj; | |
958 | ||
959 | ALL_OBJFILES (obj) | |
960 | if (libpthread_name_p (obj->name)) | |
961 | return 1; | |
962 | ||
963 | return 0; | |
964 | } | |
965 | ||
17a37d48 | 966 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 967 | Return 1 on success. */ |
17a37d48 PP |
968 | |
969 | static int | |
970 | thread_db_load (void) | |
971 | { | |
d90e17a7 | 972 | struct thread_db_info *info; |
17a37d48 | 973 | |
d90e17a7 PA |
974 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
975 | ||
976 | if (info != NULL) | |
17a37d48 PP |
977 | return 1; |
978 | ||
856d6f99 PA |
979 | /* Don't attempt to use thread_db on executables not running |
980 | yet. */ | |
981 | if (!target_has_registers) | |
17a37d48 PP |
982 | return 0; |
983 | ||
984 | /* Don't attempt to use thread_db for remote targets. */ | |
856d6f99 | 985 | if (!(target_can_run (¤t_target) || core_bfd)) |
17a37d48 PP |
986 | return 0; |
987 | ||
988 | if (thread_db_load_search ()) | |
989 | return 1; | |
990 | ||
98a5dd13 DE |
991 | /* We couldn't find a libthread_db. |
992 | If the inferior has a libpthread warn the user. */ | |
993 | if (has_libpthread ()) | |
994 | { | |
995 | warning (_("Unable to find libthread_db matching inferior's thread" | |
996 | " library, thread debugging will not be available.")); | |
997 | return 0; | |
17a37d48 | 998 | } |
98a5dd13 | 999 | |
17a37d48 PP |
1000 | /* Either this executable isn't using libpthread at all, or it is |
1001 | statically linked. Since we can't easily distinguish these two cases, | |
1002 | no warning is issued. */ | |
1003 | return 0; | |
1004 | } | |
1005 | ||
fb0e1ba7 | 1006 | static void |
12b6a110 | 1007 | disable_thread_event_reporting (struct thread_db_info *info) |
fb0e1ba7 | 1008 | { |
21e1bee4 | 1009 | if (info->td_ta_clear_event_p != NULL) |
12b6a110 PP |
1010 | { |
1011 | td_thr_events_t events; | |
fb0e1ba7 | 1012 | |
12b6a110 PP |
1013 | /* Set the process wide mask saying we aren't interested in any |
1014 | events anymore. */ | |
21e1bee4 PP |
1015 | td_event_fillset (&events); |
1016 | info->td_ta_clear_event_p (info->thread_agent, &events); | |
12b6a110 | 1017 | } |
fb0e1ba7 | 1018 | |
d90e17a7 PA |
1019 | info->td_create_bp_addr = 0; |
1020 | info->td_death_bp_addr = 0; | |
fb0e1ba7 MK |
1021 | } |
1022 | ||
1023 | static void | |
1024 | check_thread_signals (void) | |
1025 | { | |
21bf60fe | 1026 | if (!thread_signals) |
fb0e1ba7 MK |
1027 | { |
1028 | sigset_t mask; | |
1029 | int i; | |
1030 | ||
669211f5 | 1031 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1032 | sigemptyset (&thread_stop_set); |
1033 | sigemptyset (&thread_print_set); | |
1034 | ||
b9569773 | 1035 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1036 | { |
1037 | if (sigismember (&mask, i)) | |
1038 | { | |
1039 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
1040 | sigaddset (&thread_stop_set, i); | |
1041 | if (signal_print_update (target_signal_from_host (i), 0)) | |
1042 | sigaddset (&thread_print_set, i); | |
1043 | thread_signals = 1; | |
1044 | } | |
1045 | } | |
1046 | } | |
fb0e1ba7 MK |
1047 | } |
1048 | ||
0ec9a092 DJ |
1049 | /* Check whether thread_db is usable. This function is called when |
1050 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1051 | and when new shared libraries are loaded into a running process. */ | |
1052 | ||
1053 | void | |
1054 | check_for_thread_db (void) | |
fb0e1ba7 | 1055 | { |
b5057acd | 1056 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1057 | if (!thread_db_load ()) |
b5057acd | 1058 | return; |
0ec9a092 DJ |
1059 | } |
1060 | ||
1061 | static void | |
1062 | thread_db_new_objfile (struct objfile *objfile) | |
1063 | { | |
d90e17a7 PA |
1064 | /* This observer must always be called with inferior_ptid set |
1065 | correctly. */ | |
1066 | ||
0ec9a092 DJ |
1067 | if (objfile != NULL) |
1068 | check_for_thread_db (); | |
fb0e1ba7 MK |
1069 | } |
1070 | ||
a2f23071 DJ |
1071 | /* Attach to a new thread. This function is called when we receive a |
1072 | TD_CREATE event or when we iterate over all threads and find one | |
02c6c942 | 1073 | that wasn't already in our list. Returns true on success. */ |
a2f23071 | 1074 | |
02c6c942 | 1075 | static int |
39f77062 | 1076 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 1077 | const td_thrinfo_t *ti_p) |
fb0e1ba7 | 1078 | { |
17faa917 DJ |
1079 | struct private_thread_info *private; |
1080 | struct thread_info *tp = NULL; | |
fb0e1ba7 | 1081 | td_err_e err; |
d90e17a7 | 1082 | struct thread_db_info *info; |
fb0e1ba7 | 1083 | |
a2f23071 DJ |
1084 | /* If we're being called after a TD_CREATE event, we may already |
1085 | know about this thread. There are two ways this can happen. We | |
1086 | may have iterated over all threads between the thread creation | |
1087 | and the TD_CREATE event, for instance when the user has issued | |
1088 | the `info threads' command before the SIGTRAP for hitting the | |
1089 | thread creation breakpoint was reported. Alternatively, the | |
1090 | thread may have exited and a new one been created with the same | |
1091 | thread ID. In the first case we don't need to do anything; in | |
1092 | the second case we should discard information about the dead | |
1093 | thread and attach to the new one. */ | |
1094 | if (in_thread_list (ptid)) | |
1095 | { | |
e09875d4 | 1096 | tp = find_thread_ptid (ptid); |
a2f23071 DJ |
1097 | gdb_assert (tp != NULL); |
1098 | ||
17faa917 DJ |
1099 | /* If tp->private is NULL, then GDB is already attached to this |
1100 | thread, but we do not know anything about it. We can learn | |
1101 | about it here. This can only happen if we have some other | |
1102 | way besides libthread_db to notice new threads (i.e. | |
1103 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread | |
1104 | exit, so this can not be a stale thread recreated with the | |
1105 | same ID. */ | |
1106 | if (tp->private != NULL) | |
1107 | { | |
1108 | if (!tp->private->dying) | |
02c6c942 | 1109 | return 0; |
a2f23071 | 1110 | |
17faa917 DJ |
1111 | delete_thread (ptid); |
1112 | tp = NULL; | |
1113 | } | |
a2f23071 DJ |
1114 | } |
1115 | ||
856d6f99 PA |
1116 | if (target_has_execution) |
1117 | check_thread_signals (); | |
fb0e1ba7 | 1118 | |
9ee57c33 | 1119 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
02c6c942 | 1120 | return 0; /* A zombie thread -- do not attach. */ |
9ee57c33 DJ |
1121 | |
1122 | /* Under GNU/Linux, we have to attach to each and every thread. */ | |
856d6f99 PA |
1123 | if (target_has_execution |
1124 | && tp == NULL | |
17faa917 | 1125 | && lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid))) < 0) |
02c6c942 | 1126 | return 0; |
9ee57c33 | 1127 | |
17faa917 DJ |
1128 | /* Construct the thread's private data. */ |
1129 | private = xmalloc (sizeof (struct private_thread_info)); | |
1130 | memset (private, 0, sizeof (struct private_thread_info)); | |
1131 | ||
1132 | /* A thread ID of zero may mean the thread library has not initialized | |
1133 | yet. But we shouldn't even get here if that's the case. FIXME: | |
1134 | if we change GDB to always have at least one thread in the thread | |
1135 | list this will have to go somewhere else; maybe private == NULL | |
1136 | until the thread_db target claims it. */ | |
1137 | gdb_assert (ti_p->ti_tid != 0); | |
1138 | private->th = *th_p; | |
1139 | private->tid = ti_p->ti_tid; | |
1140 | ||
fb0e1ba7 | 1141 | /* Add the thread to GDB's thread list. */ |
17faa917 | 1142 | if (tp == NULL) |
2e456570 | 1143 | add_thread_with_info (ptid, private); |
17faa917 DJ |
1144 | else |
1145 | tp->private = private; | |
5365276c | 1146 | |
d90e17a7 PA |
1147 | info = get_thread_db_info (GET_PID (ptid)); |
1148 | ||
856d6f99 PA |
1149 | /* Enable thread event reporting for this thread, except when |
1150 | debugging a core file. */ | |
1151 | if (target_has_execution) | |
1152 | { | |
1153 | err = info->td_thr_event_enable_p (th_p, 1); | |
1154 | if (err != TD_OK) | |
1155 | error (_("Cannot enable thread event reporting for %s: %s"), | |
1156 | target_pid_to_str (ptid), thread_db_err_str (err)); | |
1157 | } | |
1158 | ||
02c6c942 | 1159 | return 1; |
fb0e1ba7 MK |
1160 | } |
1161 | ||
1162 | static void | |
17faa917 | 1163 | detach_thread (ptid_t ptid) |
fb0e1ba7 | 1164 | { |
a2f23071 DJ |
1165 | struct thread_info *thread_info; |
1166 | ||
a2f23071 DJ |
1167 | /* Don't delete the thread now, because it still reports as active |
1168 | until it has executed a few instructions after the event | |
1169 | breakpoint - if we deleted it now, "info threads" would cause us | |
1170 | to re-attach to it. Just mark it as having had a TD_DEATH | |
1171 | event. This means that we won't delete it from our thread list | |
1172 | until we notice that it's dead (via prune_threads), or until | |
17faa917 DJ |
1173 | something re-uses its thread ID. We'll report the thread exit |
1174 | when the underlying LWP dies. */ | |
e09875d4 | 1175 | thread_info = find_thread_ptid (ptid); |
17faa917 | 1176 | gdb_assert (thread_info != NULL && thread_info->private != NULL); |
a2f23071 | 1177 | thread_info->private->dying = 1; |
fb0e1ba7 MK |
1178 | } |
1179 | ||
1180 | static void | |
136d6dae | 1181 | thread_db_detach (struct target_ops *ops, char *args, int from_tty) |
fb0e1ba7 | 1182 | { |
117de6a9 | 1183 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1184 | struct thread_db_info *info; |
117de6a9 | 1185 | |
d90e17a7 | 1186 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
c194fbe1 | 1187 | |
d90e17a7 PA |
1188 | if (info) |
1189 | { | |
856d6f99 PA |
1190 | if (target_has_execution) |
1191 | { | |
1192 | disable_thread_event_reporting (info); | |
1193 | ||
1194 | /* Delete the old thread event breakpoints. Note that | |
1195 | unlike when mourning, we can remove them here because | |
1196 | there's still a live inferior to poke at. In any case, | |
1197 | GDB will not try to insert anything in the inferior when | |
1198 | removing a breakpoint. */ | |
1199 | remove_thread_event_breakpoints (); | |
1200 | } | |
d90e17a7 PA |
1201 | |
1202 | delete_thread_db_info (GET_PID (inferior_ptid)); | |
1203 | } | |
4105de34 | 1204 | |
7a7d3353 | 1205 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1206 | |
1207 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1208 | ||
1209 | /* If there are no more processes using libpthread, detach the | |
1210 | thread_db target ops. */ | |
1211 | if (!thread_db_list) | |
1212 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1213 | } |
1214 | ||
fb0e1ba7 MK |
1215 | /* Check if PID is currently stopped at the location of a thread event |
1216 | breakpoint location. If it is, read the event message and act upon | |
1217 | the event. */ | |
1218 | ||
1219 | static void | |
39f77062 | 1220 | check_event (ptid_t ptid) |
fb0e1ba7 | 1221 | { |
515630c5 UW |
1222 | struct regcache *regcache = get_thread_regcache (ptid); |
1223 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
fb0e1ba7 MK |
1224 | td_event_msg_t msg; |
1225 | td_thrinfo_t ti; | |
1226 | td_err_e err; | |
1227 | CORE_ADDR stop_pc; | |
4d9850d3 | 1228 | int loop = 0; |
d90e17a7 PA |
1229 | struct thread_db_info *info; |
1230 | ||
1231 | info = get_thread_db_info (GET_PID (ptid)); | |
fb0e1ba7 MK |
1232 | |
1233 | /* Bail out early if we're not at a thread event breakpoint. */ | |
515630c5 UW |
1234 | stop_pc = regcache_read_pc (regcache) |
1235 | - gdbarch_decr_pc_after_break (gdbarch); | |
d90e17a7 PA |
1236 | if (stop_pc != info->td_create_bp_addr |
1237 | && stop_pc != info->td_death_bp_addr) | |
fb0e1ba7 MK |
1238 | return; |
1239 | ||
4c28f408 | 1240 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1241 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
1242 | |
1243 | /* If we have only looked at the first thread before libpthread was | |
1244 | initialized, we may not know its thread ID yet. Make sure we do | |
1245 | before we add another thread to the list. */ | |
d90e17a7 PA |
1246 | if (!have_threads (ptid)) |
1247 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 1248 | |
4d9850d3 JJ |
1249 | /* If we are at a create breakpoint, we do not know what new lwp |
1250 | was created and cannot specifically locate the event message for it. | |
1251 | We have to call td_ta_event_getmsg() to get | |
1252 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 1253 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 1254 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
1255 | This guarantees we will process the correct message before continuing |
1256 | from the breakpoint. | |
4d9850d3 JJ |
1257 | |
1258 | Currently, death events are not enabled. If they are enabled, | |
1259 | the death event can use the td_thr_event_getmsg() interface to | |
1260 | get the message specifically for that lwp and avoid looping | |
1261 | below. */ | |
1262 | ||
1263 | loop = 1; | |
1264 | ||
1265 | do | |
fb0e1ba7 | 1266 | { |
d90e17a7 | 1267 | err = info->td_ta_event_getmsg_p (info->thread_agent, &msg); |
4d9850d3 JJ |
1268 | if (err != TD_OK) |
1269 | { | |
1270 | if (err == TD_NOMSG) | |
1271 | return; | |
fb0e1ba7 | 1272 | |
8a3fe4f8 | 1273 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
1274 | thread_db_err_str (err)); |
1275 | } | |
fb0e1ba7 | 1276 | |
d90e17a7 | 1277 | err = info->td_thr_get_info_p (msg.th_p, &ti); |
4d9850d3 | 1278 | if (err != TD_OK) |
8a3fe4f8 | 1279 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 1280 | |
17faa917 | 1281 | ptid = ptid_build (GET_PID (ptid), ti.ti_lid, 0); |
fb0e1ba7 | 1282 | |
4d9850d3 JJ |
1283 | switch (msg.event) |
1284 | { | |
1285 | case TD_CREATE: | |
a2f23071 DJ |
1286 | /* Call attach_thread whether or not we already know about a |
1287 | thread with this thread ID. */ | |
93815fbf | 1288 | attach_thread (ptid, msg.th_p, &ti); |
fb0e1ba7 | 1289 | |
4d9850d3 | 1290 | break; |
fb0e1ba7 | 1291 | |
4d9850d3 | 1292 | case TD_DEATH: |
fb0e1ba7 | 1293 | |
4d9850d3 | 1294 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 1295 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 1296 | |
17faa917 | 1297 | detach_thread (ptid); |
fb0e1ba7 | 1298 | |
4d9850d3 | 1299 | break; |
fb0e1ba7 | 1300 | |
4d9850d3 | 1301 | default: |
8a3fe4f8 | 1302 | error (_("Spurious thread event.")); |
4d9850d3 | 1303 | } |
fb0e1ba7 | 1304 | } |
4d9850d3 | 1305 | while (loop); |
fb0e1ba7 MK |
1306 | } |
1307 | ||
39f77062 | 1308 | static ptid_t |
117de6a9 | 1309 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1310 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1311 | int options) | |
fb0e1ba7 | 1312 | { |
d90e17a7 | 1313 | struct thread_db_info *info; |
117de6a9 PA |
1314 | struct target_ops *beneath = find_target_beneath (ops); |
1315 | ||
47608cb1 | 1316 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1317 | |
b84876c2 PA |
1318 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1319 | return ptid; | |
1320 | ||
1111f4aa | 1321 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1322 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1323 | return ptid; | |
fb0e1ba7 | 1324 | |
d90e17a7 PA |
1325 | info = get_thread_db_info (GET_PID (ptid)); |
1326 | ||
1327 | /* If this process isn't using thread_db, we're done. */ | |
1328 | if (info == NULL) | |
1329 | return ptid; | |
1330 | ||
3f64f7b1 DJ |
1331 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1332 | { | |
d90e17a7 PA |
1333 | /* New image, it may or may not end up using thread_db. Assume |
1334 | not unless we find otherwise. */ | |
1335 | delete_thread_db_info (GET_PID (ptid)); | |
1336 | if (!thread_db_list) | |
1337 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1338 | |
6c95b8df PA |
1339 | /* Thread event breakpoints are deleted by |
1340 | update_breakpoints_after_exec. */ | |
1341 | ||
49fd4a42 | 1342 | return ptid; |
3f64f7b1 DJ |
1343 | } |
1344 | ||
4105de34 DJ |
1345 | /* If we do not know about the main thread yet, this would be a good time to |
1346 | find it. */ | |
d90e17a7 PA |
1347 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid)) |
1348 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1349 | |
fb0e1ba7 MK |
1350 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
1351 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
1352 | /* Check for a thread event. */ | |
39f77062 | 1353 | check_event (ptid); |
fb0e1ba7 | 1354 | |
d90e17a7 | 1355 | if (have_threads (ptid)) |
4105de34 DJ |
1356 | { |
1357 | /* Change ptids back into the higher level PID + TID format. If | |
1358 | the thread is dead and no longer on the thread list, we will | |
1359 | get back a dead ptid. This can occur if the thread death | |
1360 | event gets postponed by other simultaneous events. In such a | |
1361 | case, we want to just ignore the event and continue on. */ | |
1362 | ||
4105de34 DJ |
1363 | ptid = thread_from_lwp (ptid); |
1364 | if (GET_PID (ptid) == -1) | |
1365 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
1366 | } | |
fb0e1ba7 | 1367 | |
b9b5d7ea | 1368 | return ptid; |
fb0e1ba7 MK |
1369 | } |
1370 | ||
fb0e1ba7 | 1371 | static void |
136d6dae | 1372 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1373 | { |
117de6a9 PA |
1374 | struct target_ops *target_beneath = find_target_beneath (ops); |
1375 | ||
d90e17a7 | 1376 | delete_thread_db_info (GET_PID (inferior_ptid)); |
fb0e1ba7 | 1377 | |
d90e17a7 PA |
1378 | target_beneath->to_mourn_inferior (target_beneath); |
1379 | ||
6c95b8df PA |
1380 | /* Delete the old thread event breakpoints. Do this after mourning |
1381 | the inferior, so that we don't try to uninsert them. */ | |
1382 | remove_thread_event_breakpoints (); | |
1383 | ||
b26a6851 | 1384 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1385 | if (!thread_db_list) |
1386 | unpush_target (ops); | |
fb0e1ba7 MK |
1387 | } |
1388 | ||
02c6c942 PP |
1389 | struct callback_data |
1390 | { | |
1391 | struct thread_db_info *info; | |
1392 | int new_threads; | |
1393 | }; | |
1394 | ||
fb0e1ba7 MK |
1395 | static int |
1396 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1397 | { | |
1398 | td_thrinfo_t ti; | |
1399 | td_err_e err; | |
39f77062 | 1400 | ptid_t ptid; |
403fe197 | 1401 | struct thread_info *tp; |
02c6c942 PP |
1402 | struct callback_data *cb_data = data; |
1403 | struct thread_db_info *info = cb_data->info; | |
fb0e1ba7 | 1404 | |
d90e17a7 | 1405 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1406 | if (err != TD_OK) |
8a3fe4f8 | 1407 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1408 | thread_db_err_str (err)); |
fb0e1ba7 | 1409 | |
21bf60fe MK |
1410 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
1411 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 1412 | |
254f582e | 1413 | if (ti.ti_tid == 0) |
4105de34 DJ |
1414 | { |
1415 | /* A thread ID of zero means that this is the main thread, but | |
1416 | glibc has not yet initialized thread-local storage and the | |
1417 | pthread library. We do not know what the thread's TID will | |
1418 | be yet. Just enable event reporting and otherwise ignore | |
1419 | it. */ | |
1420 | ||
4d062f1a PA |
1421 | /* In that case, we're not stopped in a fork syscall and don't |
1422 | need this glibc bug workaround. */ | |
1423 | info->need_stale_parent_threads_check = 0; | |
1424 | ||
254f582e JK |
1425 | if (target_has_execution) |
1426 | { | |
1427 | err = info->td_thr_event_enable_p (th_p, 1); | |
1428 | if (err != TD_OK) | |
1429 | error (_("Cannot enable thread event reporting for LWP %d: %s"), | |
1430 | (int) ti.ti_lid, thread_db_err_str (err)); | |
1431 | } | |
4105de34 DJ |
1432 | |
1433 | return 0; | |
1434 | } | |
1435 | ||
4d062f1a PA |
1436 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1437 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1438 | avoid doing the work if we know we don't have to. */ | |
1439 | if (info->need_stale_parent_threads_check) | |
1440 | { | |
1441 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1442 | |
4d062f1a PA |
1443 | if (tgid != -1 && tgid != info->pid) |
1444 | return 0; | |
1445 | } | |
1446 | ||
1447 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1448 | tp = find_thread_ptid (ptid); |
403fe197 | 1449 | if (tp == NULL || tp->private == NULL) |
02c6c942 PP |
1450 | { |
1451 | if (attach_thread (ptid, th_p, &ti)) | |
1452 | cb_data->new_threads += 1; | |
1453 | else | |
1454 | /* Problem attaching this thread; perhaps it exited before we | |
1455 | could attach it? | |
1456 | This could mean that the thread list inside glibc itself is in | |
1457 | inconsistent state, and libthread_db could go on looping forever | |
1458 | (observed with glibc-2.3.6). To prevent that, terminate | |
1459 | iteration: thread_db_find_new_threads_2 will retry. */ | |
1460 | return 1; | |
1461 | } | |
fb0e1ba7 MK |
1462 | |
1463 | return 0; | |
1464 | } | |
1465 | ||
02c6c942 PP |
1466 | /* Helper for thread_db_find_new_threads_2. |
1467 | Returns number of new threads found. */ | |
1468 | ||
1469 | static int | |
1470 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1471 | td_err_e *errp) |
02c6c942 PP |
1472 | { |
1473 | volatile struct gdb_exception except; | |
1474 | struct callback_data data; | |
fb169834 | 1475 | td_err_e err = TD_ERR; |
02c6c942 PP |
1476 | |
1477 | data.info = info; | |
1478 | data.new_threads = 0; | |
1479 | ||
1480 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
1481 | { | |
1482 | /* Iterate over all user-space threads to discover new threads. */ | |
1483 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1484 | find_new_threads_callback, | |
1485 | &data, | |
1486 | TD_THR_ANY_STATE, | |
1487 | TD_THR_LOWEST_PRIORITY, | |
1488 | TD_SIGNO_MASK, | |
1489 | TD_THR_ANY_USER_FLAGS); | |
1490 | } | |
1491 | ||
02d868e8 | 1492 | if (libthread_db_debug) |
02c6c942 PP |
1493 | { |
1494 | if (except.reason < 0) | |
1495 | exception_fprintf (gdb_stderr, except, | |
1496 | "Warning: find_new_threads_once: "); | |
1497 | ||
1498 | printf_filtered (_("Found %d new threads in iteration %d.\n"), | |
1499 | data.new_threads, iteration); | |
1500 | } | |
1501 | ||
1502 | if (errp != NULL) | |
1503 | *errp = err; | |
1504 | ||
1505 | return data.new_threads; | |
1506 | } | |
1507 | ||
4c28f408 | 1508 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1509 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1510 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1511 | |
fb0e1ba7 | 1512 | static void |
02c6c942 | 1513 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 MK |
1514 | { |
1515 | td_err_e err; | |
d90e17a7 PA |
1516 | struct thread_db_info *info; |
1517 | int pid = ptid_get_pid (ptid); | |
02c6c942 | 1518 | int i, loop; |
4c28f408 | 1519 | |
856d6f99 PA |
1520 | if (target_has_execution) |
1521 | { | |
1522 | struct lwp_info *lp; | |
4c28f408 | 1523 | |
856d6f99 PA |
1524 | /* In linux, we can only read memory through a stopped lwp. */ |
1525 | ALL_LWPS (lp, ptid) | |
1526 | if (lp->stopped && ptid_get_pid (lp->ptid) == pid) | |
1527 | break; | |
1528 | ||
1529 | if (!lp) | |
1530 | /* There is no stopped thread. Bail out. */ | |
1531 | return; | |
1532 | } | |
fb0e1ba7 | 1533 | |
d90e17a7 PA |
1534 | info = get_thread_db_info (GET_PID (ptid)); |
1535 | ||
4c28f408 | 1536 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1537 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1538 | |
1539 | if (until_no_new) | |
1540 | { | |
1541 | /* Require 4 successive iterations which do not find any new threads. | |
1542 | The 4 is a heuristic: there is an inherent race here, and I have | |
1543 | seen that 2 iterations in a row are not always sufficient to | |
1544 | "capture" all threads. */ | |
1545 | for (i = 0, loop = 0; loop < 4; ++i, ++loop) | |
1546 | if (find_new_threads_once (info, i, NULL) != 0) | |
1547 | /* Found some new threads. Restart the loop from beginning. */ | |
1548 | loop = -1; | |
1549 | } | |
1550 | else | |
1551 | { | |
02c6c942 PP |
1552 | find_new_threads_once (info, 0, &err); |
1553 | if (err != TD_OK) | |
1554 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
1555 | } | |
fb0e1ba7 MK |
1556 | } |
1557 | ||
02c6c942 PP |
1558 | static void |
1559 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1560 | { | |
1561 | thread_db_find_new_threads_2 (ptid, 0); | |
1562 | } | |
1563 | ||
dc146f7c VP |
1564 | static int |
1565 | update_thread_core (struct lwp_info *info, void *closure) | |
1566 | { | |
1567 | info->core = linux_nat_core_of_thread_1 (info->ptid); | |
1568 | return 0; | |
1569 | } | |
02c6c942 | 1570 | |
28439f5e PA |
1571 | static void |
1572 | thread_db_find_new_threads (struct target_ops *ops) | |
1573 | { | |
d90e17a7 PA |
1574 | struct thread_db_info *info; |
1575 | ||
1576 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
1577 | ||
1578 | if (info == NULL) | |
1579 | return; | |
1580 | ||
1581 | thread_db_find_new_threads_1 (inferior_ptid); | |
dc146f7c | 1582 | |
856d6f99 PA |
1583 | if (target_has_execution) |
1584 | iterate_over_lwps (minus_one_ptid /* iterate over all */, | |
1585 | update_thread_core, NULL); | |
28439f5e PA |
1586 | } |
1587 | ||
fb0e1ba7 | 1588 | static char * |
117de6a9 | 1589 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1590 | { |
e09875d4 | 1591 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1592 | struct target_ops *beneath; |
17faa917 DJ |
1593 | |
1594 | if (thread_info != NULL && thread_info->private != NULL) | |
fb0e1ba7 MK |
1595 | { |
1596 | static char buf[64]; | |
17faa917 | 1597 | thread_t tid; |
fb0e1ba7 | 1598 | |
17faa917 | 1599 | tid = thread_info->private->tid; |
17faa917 DJ |
1600 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
1601 | tid, GET_LWP (ptid)); | |
fb0e1ba7 MK |
1602 | |
1603 | return buf; | |
1604 | } | |
1605 | ||
117de6a9 PA |
1606 | beneath = find_target_beneath (ops); |
1607 | if (beneath->to_pid_to_str (beneath, ptid)) | |
1608 | return beneath->to_pid_to_str (beneath, ptid); | |
fb0e1ba7 | 1609 | |
39f77062 | 1610 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1611 | } |
1612 | ||
28b17333 DJ |
1613 | /* Return a string describing the state of the thread specified by |
1614 | INFO. */ | |
1615 | ||
1616 | static char * | |
1617 | thread_db_extra_thread_info (struct thread_info *info) | |
1618 | { | |
17faa917 DJ |
1619 | if (info->private == NULL) |
1620 | return NULL; | |
1621 | ||
28b17333 DJ |
1622 | if (info->private->dying) |
1623 | return "Exiting"; | |
1624 | ||
1625 | return NULL; | |
1626 | } | |
1627 | ||
b2756930 KB |
1628 | /* Get the address of the thread local variable in load module LM which |
1629 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1630 | |
1631 | static CORE_ADDR | |
117de6a9 PA |
1632 | thread_db_get_thread_local_address (struct target_ops *ops, |
1633 | ptid_t ptid, | |
b2756930 | 1634 | CORE_ADDR lm, |
b4acd559 | 1635 | CORE_ADDR offset) |
3f47be5c | 1636 | { |
17faa917 | 1637 | struct thread_info *thread_info; |
117de6a9 | 1638 | struct target_ops *beneath; |
17faa917 | 1639 | |
4105de34 | 1640 | /* If we have not discovered any threads yet, check now. */ |
d90e17a7 PA |
1641 | if (!have_threads (ptid)) |
1642 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1643 | |
17faa917 | 1644 | /* Find the matching thread. */ |
e09875d4 | 1645 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1646 | |
17faa917 | 1647 | if (thread_info != NULL && thread_info->private != NULL) |
3f47be5c | 1648 | { |
3f47be5c | 1649 | td_err_e err; |
00f515da | 1650 | psaddr_t address; |
d90e17a7 PA |
1651 | struct thread_db_info *info; |
1652 | ||
1653 | info = get_thread_db_info (GET_PID (ptid)); | |
3f47be5c EZ |
1654 | |
1655 | /* glibc doesn't provide the needed interface. */ | |
d90e17a7 | 1656 | if (!info->td_thr_tls_get_addr_p) |
109c3e39 AC |
1657 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
1658 | _("No TLS library support")); | |
3f47be5c | 1659 | |
b2756930 KB |
1660 | /* Caller should have verified that lm != 0. */ |
1661 | gdb_assert (lm != 0); | |
3f47be5c | 1662 | |
3f47be5c | 1663 | /* Finally, get the address of the variable. */ |
00f515da DE |
1664 | /* Note the cast through uintptr_t: this interface only works if |
1665 | a target address fits in a psaddr_t, which is a host pointer. | |
1666 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
d90e17a7 | 1667 | err = info->td_thr_tls_get_addr_p (&thread_info->private->th, |
00f515da | 1668 | (psaddr_t)(uintptr_t) lm, |
d90e17a7 | 1669 | offset, &address); |
3f47be5c EZ |
1670 | |
1671 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1672 | /* The memory hasn't been allocated, yet. */ | |
1673 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1674 | /* Now, if libthread_db provided the initialization image's |
1675 | address, we *could* try to build a non-lvalue value from | |
1676 | the initialization image. */ | |
109c3e39 AC |
1677 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1678 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1679 | #endif |
1680 | ||
1681 | /* Something else went wrong. */ | |
1682 | if (err != TD_OK) | |
109c3e39 AC |
1683 | throw_error (TLS_GENERIC_ERROR, |
1684 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1685 | |
1686 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1687 | /* Do proper sign extension for the target. */ |
1688 | gdb_assert (exec_bfd); | |
1689 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1690 | ? (CORE_ADDR) (intptr_t) address | |
1691 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1692 | } |
1693 | ||
117de6a9 PA |
1694 | beneath = find_target_beneath (ops); |
1695 | if (beneath->to_get_thread_local_address) | |
1696 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); | |
93ad78a7 | 1697 | else |
109c3e39 AC |
1698 | throw_error (TLS_GENERIC_ERROR, |
1699 | _("TLS not supported on this target")); | |
3f47be5c EZ |
1700 | } |
1701 | ||
0ef643c8 JB |
1702 | /* Callback routine used to find a thread based on the TID part of |
1703 | its PTID. */ | |
1704 | ||
1705 | static int | |
1706 | thread_db_find_thread_from_tid (struct thread_info *thread, void *data) | |
1707 | { | |
1708 | long *tid = (long *) data; | |
1709 | ||
1710 | if (thread->private->tid == *tid) | |
1711 | return 1; | |
1712 | ||
1713 | return 0; | |
1714 | } | |
1715 | ||
1716 | /* Implement the to_get_ada_task_ptid target method for this target. */ | |
1717 | ||
1718 | static ptid_t | |
1719 | thread_db_get_ada_task_ptid (long lwp, long thread) | |
1720 | { | |
1721 | struct thread_info *thread_info; | |
1722 | ||
d90e17a7 | 1723 | thread_db_find_new_threads_1 (inferior_ptid); |
0ef643c8 JB |
1724 | thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread); |
1725 | ||
1726 | gdb_assert (thread_info != NULL); | |
1727 | ||
1728 | return (thread_info->ptid); | |
1729 | } | |
1730 | ||
4d062f1a PA |
1731 | static void |
1732 | thread_db_resume (struct target_ops *ops, | |
1733 | ptid_t ptid, int step, enum target_signal signo) | |
1734 | { | |
1735 | struct target_ops *beneath = find_target_beneath (ops); | |
1736 | struct thread_db_info *info; | |
1737 | ||
1738 | if (ptid_equal (ptid, minus_one_ptid)) | |
1739 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
1740 | else | |
1741 | info = get_thread_db_info (GET_PID (ptid)); | |
1742 | ||
1743 | /* This workaround is only needed for child fork lwps stopped in a | |
1744 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1745 | workaround can be disabled. */ | |
1746 | if (info) | |
1747 | info->need_stale_parent_threads_check = 0; | |
1748 | ||
1749 | beneath->to_resume (beneath, ptid, step, signo); | |
1750 | } | |
1751 | ||
fb0e1ba7 MK |
1752 | static void |
1753 | init_thread_db_ops (void) | |
1754 | { | |
1755 | thread_db_ops.to_shortname = "multi-thread"; | |
1756 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1757 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
1758 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 1759 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 1760 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 1761 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
fb0e1ba7 MK |
1762 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
1763 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1764 | thread_db_ops.to_stratum = thread_stratum; | |
1765 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1766 | thread_db_ops.to_get_thread_local_address |
1767 | = thread_db_get_thread_local_address; | |
28b17333 | 1768 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 1769 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 MK |
1770 | thread_db_ops.to_magic = OPS_MAGIC; |
1771 | } | |
1772 | ||
2c0b251b PA |
1773 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1774 | extern initialize_file_ftype _initialize_thread_db; | |
1775 | ||
fb0e1ba7 MK |
1776 | void |
1777 | _initialize_thread_db (void) | |
1778 | { | |
17a37d48 PP |
1779 | init_thread_db_ops (); |
1780 | add_target (&thread_db_ops); | |
1781 | ||
1782 | /* Defer loading of libthread_db.so until inferior is running. | |
1783 | This allows gdb to load correct libthread_db for a given | |
1784 | executable -- there could be mutiple versions of glibc, | |
1785 | compiled with LinuxThreads or NPTL, and until there is | |
1786 | a running inferior, we can't tell which libthread_db is | |
1777feb0 | 1787 | the correct one to load. */ |
17a37d48 PP |
1788 | |
1789 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1790 | ||
1791 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1792 | class_support, | |
1793 | &libthread_db_search_path, _("\ | |
1794 | Set search path for libthread_db."), _("\ | |
1795 | Show the current search path or libthread_db."), _("\ | |
1796 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
1797 | gdb itself.\n\ |
1798 | Its value is a colon (':') separate list of directories to search.\n\ | |
1799 | Setting the search path to an empty list resets it to its default value."), | |
1800 | set_libthread_db_search_path, | |
17a37d48 PP |
1801 | NULL, |
1802 | &setlist, &showlist); | |
02d868e8 PP |
1803 | |
1804 | add_setshow_zinteger_cmd ("libthread-db", class_maintenance, | |
1805 | &libthread_db_debug, _("\ | |
1806 | Set libthread-db debugging."), _("\ | |
1807 | Show libthread-db debugging."), _("\ | |
1808 | When non-zero, libthread-db debugging is enabled."), | |
1809 | NULL, | |
1810 | show_libthread_db_debug, | |
1811 | &setdebuglist, &showdebuglist); | |
1812 | ||
17a37d48 PP |
1813 | /* Add ourselves to objfile event chain. */ |
1814 | observer_attach_new_objfile (thread_db_new_objfile); | |
fb0e1ba7 | 1815 | } |