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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
0b302171 | 3 | Copyright (C) 1999-2001, 2003-2012 Free Software Foundation, Inc. |
fb0e1ba7 MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
fb0e1ba7 MK |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
fb0e1ba7 MK |
19 | |
20 | #include "defs.h" | |
21 | ||
22 | #include "gdb_assert.h" | |
23 | #include <dlfcn.h> | |
24 | #include "gdb_proc_service.h" | |
25 | #include "gdb_thread_db.h" | |
26 | ||
bda9cb72 | 27 | #include "bfd.h" |
17a37d48 | 28 | #include "command.h" |
93ad78a7 | 29 | #include "exceptions.h" |
17a37d48 | 30 | #include "gdbcmd.h" |
fb0e1ba7 MK |
31 | #include "gdbthread.h" |
32 | #include "inferior.h" | |
bda9cb72 MK |
33 | #include "symfile.h" |
34 | #include "objfiles.h" | |
fb0e1ba7 | 35 | #include "target.h" |
4e052eda | 36 | #include "regcache.h" |
17a37d48 | 37 | #include "solib.h" |
3f47be5c | 38 | #include "solib-svr4.h" |
16451949 | 39 | #include "gdbcore.h" |
06d3b283 | 40 | #include "observer.h" |
0ec9a092 | 41 | #include "linux-nat.h" |
13da1c97 | 42 | #include "linux-procfs.h" |
2e794194 | 43 | #include "linux-osdata.h" |
bf88dd68 | 44 | #include "auto-load.h" |
fb0e1ba7 | 45 | |
979894f2 | 46 | #include <signal.h> |
bf88dd68 | 47 | #include <ctype.h> |
979894f2 | 48 | |
a2f23071 DJ |
49 | #ifdef HAVE_GNU_LIBC_VERSION_H |
50 | #include <gnu/libc-version.h> | |
51 | #endif | |
52 | ||
17faa917 DJ |
53 | /* GNU/Linux libthread_db support. |
54 | ||
55 | libthread_db is a library, provided along with libpthread.so, which | |
56 | exposes the internals of the thread library to a debugger. It | |
57 | allows GDB to find existing threads, new threads as they are | |
58 | created, thread IDs (usually, the result of pthread_self), and | |
59 | thread-local variables. | |
60 | ||
61 | The libthread_db interface originates on Solaris, where it is | |
62 | both more powerful and more complicated. This implementation | |
63 | only works for LinuxThreads and NPTL, the two glibc threading | |
64 | libraries. It assumes that each thread is permanently assigned | |
65 | to a single light-weight process (LWP). | |
66 | ||
67 | libthread_db-specific information is stored in the "private" field | |
68 | of struct thread_info. When the field is NULL we do not yet have | |
69 | information about the new thread; this could be temporary (created, | |
70 | but the thread library's data structures do not reflect it yet) | |
71 | or permanent (created using clone instead of pthread_create). | |
72 | ||
73 | Process IDs managed by linux-thread-db.c match those used by | |
74 | linux-nat.c: a common PID for all processes, an LWP ID for each | |
75 | thread, and no TID. We save the TID in private. Keeping it out | |
76 | of the ptid_t prevents thread IDs changing when libpthread is | |
77 | loaded or unloaded. */ | |
78 | ||
17a37d48 PP |
79 | static char *libthread_db_search_path; |
80 | ||
bf88dd68 JK |
81 | /* Set to non-zero if thread_db auto-loading is enabled |
82 | by the "set auto-load libthread-db" command. */ | |
83 | static int auto_load_thread_db = 1; | |
84 | ||
85 | /* "show" command for the auto_load_thread_db configuration variable. */ | |
86 | ||
87 | static void | |
88 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
89 | struct cmd_list_element *c, const char *value) | |
90 | { | |
91 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
92 | "is %s.\n"), | |
93 | value); | |
94 | } | |
95 | ||
84e578fb DE |
96 | static void |
97 | set_libthread_db_search_path (char *ignored, int from_tty, | |
98 | struct cmd_list_element *c) | |
99 | { | |
100 | if (*libthread_db_search_path == '\0') | |
101 | { | |
102 | xfree (libthread_db_search_path); | |
103 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
104 | } | |
105 | } | |
106 | ||
02d868e8 PP |
107 | /* If non-zero, print details of libthread_db processing. */ |
108 | ||
109 | static int libthread_db_debug; | |
110 | ||
111 | static void | |
112 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
113 | struct cmd_list_element *c, const char *value) | |
114 | { | |
115 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
116 | } | |
117 | ||
8605d56e AC |
118 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
119 | threads. */ | |
fb0e1ba7 | 120 | |
fb0e1ba7 MK |
121 | /* This module's target vector. */ |
122 | static struct target_ops thread_db_ops; | |
123 | ||
fb0e1ba7 MK |
124 | /* Non-zero if we have determined the signals used by the threads |
125 | library. */ | |
126 | static int thread_signals; | |
127 | static sigset_t thread_stop_set; | |
128 | static sigset_t thread_print_set; | |
129 | ||
d90e17a7 PA |
130 | struct thread_db_info |
131 | { | |
132 | struct thread_db_info *next; | |
133 | ||
134 | /* Process id this object refers to. */ | |
135 | int pid; | |
136 | ||
137 | /* Handle from dlopen for libthread_db.so. */ | |
138 | void *handle; | |
139 | ||
bf88dd68 JK |
140 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
141 | HANDLE. It may be NULL for system library. */ | |
142 | char *filename; | |
143 | ||
d90e17a7 PA |
144 | /* Structure that identifies the child process for the |
145 | <proc_service.h> interface. */ | |
146 | struct ps_prochandle proc_handle; | |
147 | ||
148 | /* Connection to the libthread_db library. */ | |
149 | td_thragent_t *thread_agent; | |
150 | ||
4d062f1a PA |
151 | /* True if we need to apply the workaround for glibc/BZ5983. When |
152 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
153 | list, nptl_db returns the parent's threads in addition to the new | |
154 | (single) child thread. If this flag is set, we do extra work to | |
155 | be able to ignore such stale entries. */ | |
156 | int need_stale_parent_threads_check; | |
157 | ||
d90e17a7 PA |
158 | /* Location of the thread creation event breakpoint. The code at |
159 | this location in the child process will be called by the pthread | |
160 | library whenever a new thread is created. By setting a special | |
161 | breakpoint at this location, GDB can detect when a new thread is | |
162 | created. We obtain this location via the td_ta_event_addr | |
163 | call. */ | |
164 | CORE_ADDR td_create_bp_addr; | |
fb0e1ba7 | 165 | |
d90e17a7 PA |
166 | /* Location of the thread death event breakpoint. */ |
167 | CORE_ADDR td_death_bp_addr; | |
fb0e1ba7 | 168 | |
d90e17a7 | 169 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 170 | |
d90e17a7 | 171 | td_err_e (*td_init_p) (void); |
fb0e1ba7 | 172 | |
d90e17a7 | 173 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
b4acd559 | 174 | td_thragent_t **ta); |
d90e17a7 PA |
175 | td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
176 | td_thrhandle_t *__th); | |
177 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, | |
178 | lwpid_t lwpid, td_thrhandle_t *th); | |
179 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
180 | td_thr_iter_f *callback, void *cbdata_p, | |
181 | td_thr_state_e state, int ti_pri, | |
182 | sigset_t *ti_sigmask_p, | |
183 | unsigned int ti_user_flags); | |
184 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
185 | td_event_e event, td_notify_t *ptr); | |
186 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
187 | td_thr_events_t *event); | |
21e1bee4 PP |
188 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
189 | td_thr_events_t *event); | |
d90e17a7 PA |
190 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
191 | td_event_msg_t *msg); | |
192 | ||
193 | td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
194 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
195 | td_thrinfo_t *infop); | |
196 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, | |
197 | int event); | |
198 | ||
199 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
200 | psaddr_t map_address, |
201 | size_t offset, psaddr_t *address); | |
d90e17a7 PA |
202 | }; |
203 | ||
204 | /* List of known processes using thread_db, and the required | |
205 | bookkeeping. */ | |
206 | struct thread_db_info *thread_db_list; | |
207 | ||
208 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 209 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 PA |
210 | |
211 | /* Add the current inferior to the list of processes using libpthread. | |
212 | Return a pointer to the newly allocated object that was added to | |
213 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
214 | LIBTHREAD_DB_SO. */ | |
215 | ||
216 | static struct thread_db_info * | |
217 | add_thread_db_info (void *handle) | |
218 | { | |
d90e17a7 PA |
219 | struct thread_db_info *info; |
220 | ||
221 | info = xcalloc (1, sizeof (*info)); | |
222 | info->pid = ptid_get_pid (inferior_ptid); | |
223 | info->handle = handle; | |
856d6f99 PA |
224 | |
225 | /* The workaround works by reading from /proc/pid/status, so it is | |
226 | disabled for core files. */ | |
227 | if (target_has_execution) | |
228 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
229 | |
230 | info->next = thread_db_list; | |
231 | thread_db_list = info; | |
232 | ||
233 | return info; | |
234 | } | |
235 | ||
236 | /* Return the thread_db_info object representing the bookkeeping | |
237 | related to process PID, if any; NULL otherwise. */ | |
238 | ||
239 | static struct thread_db_info * | |
240 | get_thread_db_info (int pid) | |
241 | { | |
242 | struct thread_db_info *info; | |
243 | ||
244 | for (info = thread_db_list; info; info = info->next) | |
245 | if (pid == info->pid) | |
246 | return info; | |
247 | ||
248 | return NULL; | |
249 | } | |
250 | ||
251 | /* When PID has exited or has been detached, we no longer want to keep | |
252 | track of it as using libpthread. Call this function to discard | |
253 | thread_db related info related to PID. Note that this closes | |
254 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
255 | ||
256 | static void | |
257 | delete_thread_db_info (int pid) | |
258 | { | |
259 | struct thread_db_info *info, *info_prev; | |
260 | ||
261 | info_prev = NULL; | |
262 | ||
263 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
264 | if (pid == info->pid) | |
265 | break; | |
266 | ||
267 | if (info == NULL) | |
268 | return; | |
269 | ||
270 | if (info->handle != NULL) | |
271 | dlclose (info->handle); | |
272 | ||
bf88dd68 JK |
273 | xfree (info->filename); |
274 | ||
d90e17a7 PA |
275 | if (info_prev) |
276 | info_prev->next = info->next; | |
277 | else | |
278 | thread_db_list = info->next; | |
279 | ||
280 | xfree (info); | |
281 | } | |
fb0e1ba7 MK |
282 | |
283 | /* Prototypes for local functions. */ | |
02c6c942 PP |
284 | static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
285 | const td_thrinfo_t *ti_p); | |
17faa917 | 286 | static void detach_thread (ptid_t ptid); |
fb0e1ba7 MK |
287 | \f |
288 | ||
5365276c DJ |
289 | /* Use "struct private_thread_info" to cache thread state. This is |
290 | a substantial optimization. */ | |
291 | ||
fb0e1ba7 MK |
292 | struct private_thread_info |
293 | { | |
a2f23071 DJ |
294 | /* Flag set when we see a TD_DEATH event for this thread. */ |
295 | unsigned int dying:1; | |
296 | ||
5365276c | 297 | /* Cached thread state. */ |
5365276c | 298 | td_thrhandle_t th; |
17faa917 | 299 | thread_t tid; |
fb0e1ba7 | 300 | }; |
fb0e1ba7 | 301 | \f |
21bf60fe | 302 | |
fb0e1ba7 MK |
303 | static char * |
304 | thread_db_err_str (td_err_e err) | |
305 | { | |
306 | static char buf[64]; | |
307 | ||
308 | switch (err) | |
309 | { | |
310 | case TD_OK: | |
311 | return "generic 'call succeeded'"; | |
312 | case TD_ERR: | |
313 | return "generic error"; | |
314 | case TD_NOTHR: | |
315 | return "no thread to satisfy query"; | |
316 | case TD_NOSV: | |
317 | return "no sync handle to satisfy query"; | |
318 | case TD_NOLWP: | |
319 | return "no LWP to satisfy query"; | |
320 | case TD_BADPH: | |
321 | return "invalid process handle"; | |
322 | case TD_BADTH: | |
323 | return "invalid thread handle"; | |
324 | case TD_BADSH: | |
325 | return "invalid synchronization handle"; | |
326 | case TD_BADTA: | |
327 | return "invalid thread agent"; | |
328 | case TD_BADKEY: | |
329 | return "invalid key"; | |
330 | case TD_NOMSG: | |
331 | return "no event message for getmsg"; | |
332 | case TD_NOFPREGS: | |
333 | return "FPU register set not available"; | |
334 | case TD_NOLIBTHREAD: | |
335 | return "application not linked with libthread"; | |
336 | case TD_NOEVENT: | |
337 | return "requested event is not supported"; | |
338 | case TD_NOCAPAB: | |
339 | return "capability not available"; | |
340 | case TD_DBERR: | |
341 | return "debugger service failed"; | |
342 | case TD_NOAPLIC: | |
343 | return "operation not applicable to"; | |
344 | case TD_NOTSD: | |
345 | return "no thread-specific data for this thread"; | |
346 | case TD_MALLOC: | |
347 | return "malloc failed"; | |
348 | case TD_PARTIALREG: | |
349 | return "only part of register set was written/read"; | |
350 | case TD_NOXREGS: | |
351 | return "X register set not available for this thread"; | |
59f80f10 DJ |
352 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
353 | case TD_NOTALLOC: | |
354 | return "thread has not yet allocated TLS for given module"; | |
355 | #endif | |
356 | #ifdef THREAD_DB_HAS_TD_VERSION | |
357 | case TD_VERSION: | |
358 | return "versions of libpthread and libthread_db do not match"; | |
359 | #endif | |
360 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
361 | case TD_NOTLS: | |
362 | return "there is no TLS segment in the given module"; | |
363 | #endif | |
fb0e1ba7 MK |
364 | default: |
365 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
366 | return buf; | |
367 | } | |
368 | } | |
fb0e1ba7 | 369 | \f |
4105de34 DJ |
370 | /* Return 1 if any threads have been registered. There may be none if |
371 | the threading library is not fully initialized yet. */ | |
372 | ||
373 | static int | |
d90e17a7 | 374 | have_threads_callback (struct thread_info *thread, void *args) |
4105de34 | 375 | { |
d90e17a7 | 376 | int pid = * (int *) args; |
e0881a8e | 377 | |
d90e17a7 PA |
378 | if (ptid_get_pid (thread->ptid) != pid) |
379 | return 0; | |
380 | ||
e3bc4218 | 381 | return thread->private != NULL; |
4105de34 DJ |
382 | } |
383 | ||
384 | static int | |
d90e17a7 | 385 | have_threads (ptid_t ptid) |
4105de34 | 386 | { |
d90e17a7 PA |
387 | int pid = ptid_get_pid (ptid); |
388 | ||
389 | return iterate_over_threads (have_threads_callback, &pid) != NULL; | |
4105de34 DJ |
390 | } |
391 | ||
d90e17a7 PA |
392 | struct thread_get_info_inout |
393 | { | |
394 | struct thread_info *thread_info; | |
395 | struct thread_db_info *thread_db_info; | |
396 | }; | |
397 | ||
5365276c | 398 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 399 | threads to LWPs. |
5365276c DJ |
400 | |
401 | THP is a handle to the current thread; if INFOP is not NULL, the | |
402 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
403 | *INFOP. |
404 | ||
405 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
406 | zero is returned to indicate success. */ | |
5365276c DJ |
407 | |
408 | static int | |
d90e17a7 | 409 | thread_get_info_callback (const td_thrhandle_t *thp, void *argp) |
5365276c DJ |
410 | { |
411 | td_thrinfo_t ti; | |
412 | td_err_e err; | |
5365276c | 413 | ptid_t thread_ptid; |
d90e17a7 PA |
414 | struct thread_get_info_inout *inout; |
415 | struct thread_db_info *info; | |
416 | ||
417 | inout = argp; | |
418 | info = inout->thread_db_info; | |
5365276c | 419 | |
d90e17a7 | 420 | err = info->td_thr_get_info_p (thp, &ti); |
5365276c | 421 | if (err != TD_OK) |
8a3fe4f8 | 422 | error (_("thread_get_info_callback: cannot get thread info: %s"), |
5365276c DJ |
423 | thread_db_err_str (err)); |
424 | ||
425 | /* Fill the cache. */ | |
d90e17a7 | 426 | thread_ptid = ptid_build (info->pid, ti.ti_lid, 0); |
e09875d4 | 427 | inout->thread_info = find_thread_ptid (thread_ptid); |
5365276c | 428 | |
b9b5d7ea | 429 | /* In the case of a zombie thread, don't continue. We don't want to |
f90ef764 | 430 | attach to it thinking it is a new thread. */ |
b9b5d7ea | 431 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
d90e17a7 | 432 | return TD_THR_ZOMBIE; |
b9b5d7ea | 433 | |
d90e17a7 | 434 | if (inout->thread_info == NULL) |
5365276c DJ |
435 | { |
436 | /* New thread. Attach to it now (why wait?). */ | |
d90e17a7 PA |
437 | if (!have_threads (thread_ptid)) |
438 | thread_db_find_new_threads_1 (thread_ptid); | |
4c28f408 PA |
439 | else |
440 | attach_thread (thread_ptid, thp, &ti); | |
e09875d4 | 441 | inout->thread_info = find_thread_ptid (thread_ptid); |
d90e17a7 | 442 | gdb_assert (inout->thread_info != NULL); |
5365276c DJ |
443 | } |
444 | ||
5365276c DJ |
445 | return 0; |
446 | } | |
5365276c | 447 | \f |
fb0e1ba7 MK |
448 | /* Convert between user-level thread ids and LWP ids. */ |
449 | ||
39f77062 KB |
450 | static ptid_t |
451 | thread_from_lwp (ptid_t ptid) | |
fb0e1ba7 | 452 | { |
fb0e1ba7 MK |
453 | td_thrhandle_t th; |
454 | td_err_e err; | |
d90e17a7 PA |
455 | struct thread_db_info *info; |
456 | struct thread_get_info_inout io = {0}; | |
fb0e1ba7 | 457 | |
6cb9b55b PP |
458 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
459 | th.th_unique = 0; | |
460 | ||
17faa917 DJ |
461 | /* This ptid comes from linux-nat.c, which should always fill in the |
462 | LWP. */ | |
463 | gdb_assert (GET_LWP (ptid) != 0); | |
fb0e1ba7 | 464 | |
d90e17a7 PA |
465 | info = get_thread_db_info (GET_PID (ptid)); |
466 | ||
4c28f408 | 467 | /* Access an lwp we know is stopped. */ |
d90e17a7 PA |
468 | info->proc_handle.ptid = ptid; |
469 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); | |
fb0e1ba7 | 470 | if (err != TD_OK) |
8a3fe4f8 | 471 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
39f77062 | 472 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 473 | |
b9b5d7ea JJ |
474 | /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the |
475 | event thread has already died. If another gdb interface has called | |
476 | thread_alive() previously, the thread won't be found on the thread list | |
477 | anymore. In that case, we don't want to process this ptid anymore | |
478 | to avoid the possibility of later treating it as a newly | |
479 | discovered thread id that we should add to the list. Thus, | |
480 | we return a -1 ptid which is also how the thread list marks a | |
481 | dead thread. */ | |
d90e17a7 PA |
482 | io.thread_db_info = info; |
483 | io.thread_info = NULL; | |
484 | if (thread_get_info_callback (&th, &io) == TD_THR_ZOMBIE | |
485 | && io.thread_info == NULL) | |
486 | return minus_one_ptid; | |
b9b5d7ea | 487 | |
17faa917 DJ |
488 | gdb_assert (ptid_get_tid (ptid) == 0); |
489 | return ptid; | |
fb0e1ba7 MK |
490 | } |
491 | \f | |
492 | ||
4c28f408 PA |
493 | /* Attach to lwp PTID, doing whatever else is required to have this |
494 | LWP under the debugger's control --- e.g., enabling event | |
495 | reporting. Returns true on success. */ | |
496 | int | |
497 | thread_db_attach_lwp (ptid_t ptid) | |
498 | { | |
499 | td_thrhandle_t th; | |
500 | td_thrinfo_t ti; | |
501 | td_err_e err; | |
d90e17a7 | 502 | struct thread_db_info *info; |
4c28f408 | 503 | |
d90e17a7 PA |
504 | info = get_thread_db_info (GET_PID (ptid)); |
505 | ||
506 | if (info == NULL) | |
4c28f408 PA |
507 | return 0; |
508 | ||
509 | /* This ptid comes from linux-nat.c, which should always fill in the | |
510 | LWP. */ | |
511 | gdb_assert (GET_LWP (ptid) != 0); | |
512 | ||
513 | /* Access an lwp we know is stopped. */ | |
d90e17a7 | 514 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
515 | |
516 | /* If we have only looked at the first thread before libpthread was | |
517 | initialized, we may not know its thread ID yet. Make sure we do | |
518 | before we add another thread to the list. */ | |
d90e17a7 PA |
519 | if (!have_threads (ptid)) |
520 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 521 | |
d90e17a7 | 522 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); |
4c28f408 PA |
523 | if (err != TD_OK) |
524 | /* Cannot find user-level thread. */ | |
525 | return 0; | |
526 | ||
d90e17a7 | 527 | err = info->td_thr_get_info_p (&th, &ti); |
4c28f408 PA |
528 | if (err != TD_OK) |
529 | { | |
530 | warning (_("Cannot get thread info: %s"), thread_db_err_str (err)); | |
531 | return 0; | |
532 | } | |
533 | ||
534 | attach_thread (ptid, &th, &ti); | |
535 | return 1; | |
536 | } | |
537 | ||
5220ea4c AC |
538 | static void * |
539 | verbose_dlsym (void *handle, const char *name) | |
540 | { | |
541 | void *sym = dlsym (handle, name); | |
542 | if (sym == NULL) | |
3e43a32a MS |
543 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
544 | name, dlerror ()); | |
5220ea4c AC |
545 | return sym; |
546 | } | |
547 | ||
cdbc0b18 | 548 | static td_err_e |
d90e17a7 | 549 | enable_thread_event (int event, CORE_ADDR *bp) |
24557e30 AC |
550 | { |
551 | td_notify_t notify; | |
cdbc0b18 | 552 | td_err_e err; |
d90e17a7 PA |
553 | struct thread_db_info *info; |
554 | ||
555 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
24557e30 | 556 | |
4c28f408 | 557 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 558 | info->proc_handle.ptid = inferior_ptid; |
4c28f408 | 559 | |
24557e30 | 560 | /* Get the breakpoint address for thread EVENT. */ |
d90e17a7 | 561 | err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify); |
24557e30 | 562 | if (err != TD_OK) |
cdbc0b18 | 563 | return err; |
24557e30 AC |
564 | |
565 | /* Set up the breakpoint. */ | |
16451949 AS |
566 | gdb_assert (exec_bfd); |
567 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
a97b0ac8 | 568 | (target_gdbarch, |
16451949 AS |
569 | /* Do proper sign extension for the target. */ |
570 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
571 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
572 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
573 | ¤t_target)); | |
a6d9a66e | 574 | create_thread_event_breakpoint (target_gdbarch, *bp); |
24557e30 | 575 | |
cdbc0b18 | 576 | return TD_OK; |
24557e30 AC |
577 | } |
578 | ||
fb0e1ba7 MK |
579 | static void |
580 | enable_thread_event_reporting (void) | |
581 | { | |
582 | td_thr_events_t events; | |
fb0e1ba7 | 583 | td_err_e err; |
a2f23071 DJ |
584 | #ifdef HAVE_GNU_LIBC_VERSION_H |
585 | const char *libc_version; | |
586 | int libc_major, libc_minor; | |
587 | #endif | |
d90e17a7 PA |
588 | struct thread_db_info *info; |
589 | ||
590 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
fb0e1ba7 MK |
591 | |
592 | /* We cannot use the thread event reporting facility if these | |
593 | functions aren't available. */ | |
d90e17a7 PA |
594 | if (info->td_ta_event_addr_p == NULL |
595 | || info->td_ta_set_event_p == NULL | |
596 | || info->td_ta_event_getmsg_p == NULL | |
597 | || info->td_thr_event_enable_p == NULL) | |
fb0e1ba7 MK |
598 | return; |
599 | ||
600 | /* Set the process wide mask saying which events we're interested in. */ | |
601 | td_event_emptyset (&events); | |
602 | td_event_addset (&events, TD_CREATE); | |
a2f23071 DJ |
603 | |
604 | #ifdef HAVE_GNU_LIBC_VERSION_H | |
34091d9b | 605 | /* The event reporting facility is broken for TD_DEATH events in |
2ef52e77 | 606 | glibc 2.1.3, so don't enable it if we have glibc but a lower |
34091d9b | 607 | version. */ |
a2f23071 DJ |
608 | libc_version = gnu_get_libc_version (); |
609 | if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 | |
610 | && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) | |
fb0e1ba7 | 611 | #endif |
a2f23071 | 612 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 | 613 | |
d90e17a7 | 614 | err = info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
615 | if (err != TD_OK) |
616 | { | |
8a3fe4f8 | 617 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
618 | thread_db_err_str (err)); |
619 | return; | |
620 | } | |
621 | ||
622 | /* Delete previous thread event breakpoints, if any. */ | |
623 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
624 | info->td_create_bp_addr = 0; |
625 | info->td_death_bp_addr = 0; | |
fb0e1ba7 | 626 | |
24557e30 | 627 | /* Set up the thread creation event. */ |
d90e17a7 | 628 | err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr); |
cdbc0b18 | 629 | if (err != TD_OK) |
fb0e1ba7 | 630 | { |
8a3fe4f8 | 631 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
632 | thread_db_err_str (err)); |
633 | return; | |
634 | } | |
635 | ||
24557e30 | 636 | /* Set up the thread death event. */ |
d90e17a7 | 637 | err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr); |
cdbc0b18 | 638 | if (err != TD_OK) |
fb0e1ba7 | 639 | { |
8a3fe4f8 | 640 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
641 | thread_db_err_str (err)); |
642 | return; | |
643 | } | |
fb0e1ba7 MK |
644 | } |
645 | ||
456b0e24 PP |
646 | /* Same as thread_db_find_new_threads_1, but silently ignore errors. */ |
647 | ||
648 | static void | |
649 | thread_db_find_new_threads_silently (ptid_t ptid) | |
650 | { | |
651 | volatile struct gdb_exception except; | |
652 | ||
653 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
654 | { | |
02c6c942 | 655 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
656 | } |
657 | ||
02d868e8 | 658 | if (except.reason < 0 && libthread_db_debug) |
e0881a8e MS |
659 | { |
660 | exception_fprintf (gdb_stderr, except, | |
661 | "Warning: thread_db_find_new_threads_silently: "); | |
662 | } | |
456b0e24 PP |
663 | } |
664 | ||
d90e17a7 PA |
665 | /* Lookup a library in which given symbol resides. |
666 | Note: this is looking in GDB process, not in the inferior. | |
667 | Returns library name, or NULL. */ | |
668 | ||
669 | static const char * | |
670 | dladdr_to_soname (const void *addr) | |
671 | { | |
672 | Dl_info info; | |
673 | ||
674 | if (dladdr (addr, &info) != 0) | |
675 | return info.dli_fname; | |
676 | return NULL; | |
677 | } | |
678 | ||
2471d008 | 679 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
680 | Return 1 on success. |
681 | Failure could happen if libthread_db does not have symbols we expect, | |
682 | or when it refuses to work with the current inferior (e.g. due to | |
683 | version mismatch between libthread_db and libpthread). */ | |
684 | ||
685 | static int | |
d90e17a7 | 686 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
687 | { |
688 | td_err_e err; | |
689 | ||
690 | /* Initialize pointers to the dynamic library functions we will use. | |
691 | Essential functions first. */ | |
692 | ||
d90e17a7 PA |
693 | info->td_init_p = verbose_dlsym (info->handle, "td_init"); |
694 | if (info->td_init_p == NULL) | |
17a37d48 PP |
695 | return 0; |
696 | ||
d90e17a7 | 697 | err = info->td_init_p (); |
17a37d48 PP |
698 | if (err != TD_OK) |
699 | { | |
3e43a32a MS |
700 | warning (_("Cannot initialize libthread_db: %s"), |
701 | thread_db_err_str (err)); | |
17a37d48 PP |
702 | return 0; |
703 | } | |
704 | ||
d90e17a7 PA |
705 | info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new"); |
706 | if (info->td_ta_new_p == NULL) | |
17a37d48 PP |
707 | return 0; |
708 | ||
709 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 710 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
711 | |
712 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 713 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
714 | if (err != TD_OK) |
715 | { | |
02d868e8 | 716 | if (libthread_db_debug) |
17a37d48 PP |
717 | printf_unfiltered (_("td_ta_new failed: %s\n"), |
718 | thread_db_err_str (err)); | |
719 | else | |
720 | switch (err) | |
721 | { | |
722 | case TD_NOLIBTHREAD: | |
723 | #ifdef THREAD_DB_HAS_TD_VERSION | |
724 | case TD_VERSION: | |
725 | #endif | |
726 | /* The errors above are not unexpected and silently ignored: | |
727 | they just mean we haven't found correct version of | |
728 | libthread_db yet. */ | |
729 | break; | |
730 | default: | |
731 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
732 | } | |
733 | return 0; | |
734 | } | |
735 | ||
d90e17a7 PA |
736 | info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr"); |
737 | if (info->td_ta_map_id2thr_p == NULL) | |
17a37d48 PP |
738 | return 0; |
739 | ||
3e43a32a MS |
740 | info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, |
741 | "td_ta_map_lwp2thr"); | |
d90e17a7 | 742 | if (info->td_ta_map_lwp2thr_p == NULL) |
17a37d48 PP |
743 | return 0; |
744 | ||
d90e17a7 PA |
745 | info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter"); |
746 | if (info->td_ta_thr_iter_p == NULL) | |
17a37d48 PP |
747 | return 0; |
748 | ||
d90e17a7 PA |
749 | info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate"); |
750 | if (info->td_thr_validate_p == NULL) | |
17a37d48 PP |
751 | return 0; |
752 | ||
d90e17a7 PA |
753 | info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info"); |
754 | if (info->td_thr_get_info_p == NULL) | |
17a37d48 PP |
755 | return 0; |
756 | ||
757 | /* These are not essential. */ | |
d90e17a7 PA |
758 | info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr"); |
759 | info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event"); | |
21e1bee4 | 760 | info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event"); |
d90e17a7 PA |
761 | info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); |
762 | info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); | |
763 | info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); | |
17a37d48 PP |
764 | |
765 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); | |
766 | ||
02d868e8 | 767 | if (libthread_db_debug || *libthread_db_search_path) |
d90e17a7 PA |
768 | { |
769 | const char *library; | |
17a37d48 | 770 | |
d90e17a7 PA |
771 | library = dladdr_to_soname (*info->td_ta_new_p); |
772 | if (library == NULL) | |
773 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 774 | |
d90e17a7 PA |
775 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
776 | library); | |
777 | } | |
17a37d48 | 778 | |
d90e17a7 PA |
779 | /* The thread library was detected. Activate the thread_db target |
780 | if this is the first process using it. */ | |
781 | if (thread_db_list->next == NULL) | |
782 | push_target (&thread_db_ops); | |
17a37d48 | 783 | |
856d6f99 PA |
784 | /* Enable event reporting, but not when debugging a core file. */ |
785 | if (target_has_execution) | |
786 | enable_thread_event_reporting (); | |
456b0e24 | 787 | |
099cb4fb | 788 | /* There appears to be a bug in glibc-2.3.6: calls to td_thr_get_info fail |
456b0e24 PP |
789 | with TD_ERR for statically linked executables if td_thr_get_info is |
790 | called before glibc has initialized itself. Silently ignore such | |
099cb4fb | 791 | errors, and let gdb enumerate threads again later. */ |
456b0e24 | 792 | thread_db_find_new_threads_silently (inferior_ptid); |
099cb4fb | 793 | |
d90e17a7 | 794 | return 1; |
17a37d48 PP |
795 | } |
796 | ||
797 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
798 | relative, or just LIBTHREAD_DB. */ | |
799 | ||
800 | static int | |
801 | try_thread_db_load (const char *library) | |
802 | { | |
803 | void *handle; | |
d90e17a7 | 804 | struct thread_db_info *info; |
17a37d48 | 805 | |
02d868e8 | 806 | if (libthread_db_debug) |
17a37d48 PP |
807 | printf_unfiltered (_("Trying host libthread_db library: %s.\n"), |
808 | library); | |
809 | handle = dlopen (library, RTLD_NOW); | |
810 | if (handle == NULL) | |
811 | { | |
02d868e8 | 812 | if (libthread_db_debug) |
17a37d48 PP |
813 | printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ()); |
814 | return 0; | |
815 | } | |
816 | ||
02d868e8 | 817 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
818 | { |
819 | void *td_init; | |
820 | ||
821 | td_init = dlsym (handle, "td_init"); | |
822 | if (td_init != NULL) | |
823 | { | |
824 | const char *const libpath = dladdr_to_soname (td_init); | |
825 | ||
826 | if (libpath != NULL) | |
827 | printf_unfiltered (_("Host %s resolved to: %s.\n"), | |
828 | library, libpath); | |
829 | } | |
830 | } | |
831 | ||
d90e17a7 PA |
832 | info = add_thread_db_info (handle); |
833 | ||
bf88dd68 JK |
834 | /* Do not save system library name, that one is always trusted. */ |
835 | if (strchr (library, '/') != NULL) | |
836 | info->filename = gdb_realpath (library); | |
837 | ||
d90e17a7 | 838 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
839 | return 1; |
840 | ||
841 | /* This library "refused" to work on current inferior. */ | |
d90e17a7 | 842 | delete_thread_db_info (GET_PID (inferior_ptid)); |
17a37d48 PP |
843 | return 0; |
844 | } | |
845 | ||
290351b8 DE |
846 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
847 | Try loading libthread_db from the same directory as OBJ. | |
848 | The result is true for success. */ | |
849 | ||
850 | static int | |
851 | try_thread_db_load_from_pdir_1 (struct objfile *obj) | |
852 | { | |
05386e9e TT |
853 | struct cleanup *cleanup; |
854 | char *path, *cp; | |
855 | int result; | |
290351b8 | 856 | |
05386e9e | 857 | if (obj->name[0] != '/') |
290351b8 DE |
858 | { |
859 | warning (_("Expected absolute pathname for libpthread in the" | |
05386e9e | 860 | " inferior, but got %s."), obj->name); |
290351b8 DE |
861 | return 0; |
862 | } | |
05386e9e TT |
863 | |
864 | path = xmalloc (strlen (obj->name) + 1 + strlen (LIBTHREAD_DB_SO) + 1); | |
865 | cleanup = make_cleanup (xfree, path); | |
866 | ||
867 | strcpy (path, obj->name); | |
868 | cp = strrchr (path, '/'); | |
869 | /* This should at minimum hit the first character. */ | |
870 | gdb_assert (cp != NULL); | |
871 | strcpy (cp + 1, LIBTHREAD_DB_SO); | |
872 | result = try_thread_db_load (path); | |
873 | ||
874 | do_cleanups (cleanup); | |
875 | return result; | |
290351b8 DE |
876 | } |
877 | ||
98a5dd13 DE |
878 | /* Handle $pdir in libthread-db-search-path. |
879 | Look for libthread_db in the directory of libpthread. | |
880 | The result is true for success. */ | |
881 | ||
882 | static int | |
883 | try_thread_db_load_from_pdir (void) | |
884 | { | |
885 | struct objfile *obj; | |
886 | ||
bf88dd68 JK |
887 | if (!auto_load_thread_db) |
888 | return 0; | |
889 | ||
98a5dd13 DE |
890 | ALL_OBJFILES (obj) |
891 | if (libpthread_name_p (obj->name)) | |
892 | { | |
290351b8 DE |
893 | if (try_thread_db_load_from_pdir_1 (obj)) |
894 | return 1; | |
895 | ||
896 | /* We may have found the separate-debug-info version of | |
897 | libpthread, and it may live in a directory without a matching | |
898 | libthread_db. */ | |
899 | if (obj->separate_debug_objfile_backlink != NULL) | |
900 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink); | |
901 | ||
98a5dd13 DE |
902 | return 0; |
903 | } | |
904 | ||
905 | return 0; | |
906 | } | |
907 | ||
908 | /* Handle $sdir in libthread-db-search-path. | |
909 | Look for libthread_db in the system dirs, or wherever a plain | |
910 | dlopen(file_without_path) will look. | |
911 | The result is true for success. */ | |
912 | ||
913 | static int | |
914 | try_thread_db_load_from_sdir (void) | |
915 | { | |
916 | return try_thread_db_load (LIBTHREAD_DB_SO); | |
917 | } | |
918 | ||
919 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
920 | The result is true for success. */ | |
921 | ||
922 | static int | |
923 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
924 | { | |
05386e9e TT |
925 | struct cleanup *cleanup; |
926 | char *path; | |
927 | int result; | |
98a5dd13 | 928 | |
bf88dd68 JK |
929 | if (!auto_load_thread_db) |
930 | return 0; | |
931 | ||
05386e9e TT |
932 | path = xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
933 | cleanup = make_cleanup (xfree, path); | |
98a5dd13 DE |
934 | |
935 | memcpy (path, dir, dir_len); | |
936 | path[dir_len] = '/'; | |
937 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
05386e9e TT |
938 | result = try_thread_db_load (path); |
939 | ||
940 | do_cleanups (cleanup); | |
941 | return result; | |
98a5dd13 DE |
942 | } |
943 | ||
17a37d48 | 944 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
945 | to work on current inferior. |
946 | The result is true for success. */ | |
17a37d48 PP |
947 | |
948 | static int | |
949 | thread_db_load_search (void) | |
950 | { | |
17a37d48 PP |
951 | const char *search_path = libthread_db_search_path; |
952 | int rc = 0; | |
953 | ||
954 | while (*search_path) | |
955 | { | |
956 | const char *end = strchr (search_path, ':'); | |
98a5dd13 DE |
957 | const char *this_dir = search_path; |
958 | size_t this_dir_len; | |
e0881a8e | 959 | |
17a37d48 PP |
960 | if (end) |
961 | { | |
98a5dd13 DE |
962 | this_dir_len = end - search_path; |
963 | search_path += this_dir_len + 1; | |
17a37d48 PP |
964 | } |
965 | else | |
966 | { | |
98a5dd13 DE |
967 | this_dir_len = strlen (this_dir); |
968 | search_path += this_dir_len; | |
969 | } | |
17a37d48 | 970 | |
98a5dd13 DE |
971 | if (this_dir_len == sizeof ("$pdir") - 1 |
972 | && strncmp (this_dir, "$pdir", this_dir_len) == 0) | |
973 | { | |
974 | if (try_thread_db_load_from_pdir ()) | |
975 | { | |
976 | rc = 1; | |
977 | break; | |
978 | } | |
17a37d48 | 979 | } |
98a5dd13 DE |
980 | else if (this_dir_len == sizeof ("$sdir") - 1 |
981 | && strncmp (this_dir, "$sdir", this_dir_len) == 0) | |
982 | { | |
983 | if (try_thread_db_load_from_sdir ()) | |
984 | { | |
985 | rc = 1; | |
986 | break; | |
987 | } | |
988 | } | |
989 | else | |
17a37d48 | 990 | { |
98a5dd13 DE |
991 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
992 | { | |
993 | rc = 1; | |
994 | break; | |
995 | } | |
17a37d48 PP |
996 | } |
997 | } | |
98a5dd13 DE |
998 | |
999 | if (libthread_db_debug) | |
1000 | printf_unfiltered (_("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1001 | return rc; |
1002 | } | |
1003 | ||
98a5dd13 DE |
1004 | /* Return non-zero if the inferior has a libpthread. */ |
1005 | ||
1006 | static int | |
1007 | has_libpthread (void) | |
1008 | { | |
1009 | struct objfile *obj; | |
1010 | ||
1011 | ALL_OBJFILES (obj) | |
1012 | if (libpthread_name_p (obj->name)) | |
1013 | return 1; | |
1014 | ||
1015 | return 0; | |
1016 | } | |
1017 | ||
17a37d48 | 1018 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1019 | Return 1 on success. */ |
17a37d48 PP |
1020 | |
1021 | static int | |
1022 | thread_db_load (void) | |
1023 | { | |
d90e17a7 | 1024 | struct thread_db_info *info; |
17a37d48 | 1025 | |
d90e17a7 PA |
1026 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
1027 | ||
1028 | if (info != NULL) | |
17a37d48 PP |
1029 | return 1; |
1030 | ||
856d6f99 PA |
1031 | /* Don't attempt to use thread_db on executables not running |
1032 | yet. */ | |
1033 | if (!target_has_registers) | |
17a37d48 PP |
1034 | return 0; |
1035 | ||
1036 | /* Don't attempt to use thread_db for remote targets. */ | |
856d6f99 | 1037 | if (!(target_can_run (¤t_target) || core_bfd)) |
17a37d48 PP |
1038 | return 0; |
1039 | ||
1040 | if (thread_db_load_search ()) | |
1041 | return 1; | |
1042 | ||
98a5dd13 DE |
1043 | /* We couldn't find a libthread_db. |
1044 | If the inferior has a libpthread warn the user. */ | |
1045 | if (has_libpthread ()) | |
1046 | { | |
1047 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1048 | " library, thread debugging will not be available.")); | |
1049 | return 0; | |
17a37d48 | 1050 | } |
98a5dd13 | 1051 | |
17a37d48 PP |
1052 | /* Either this executable isn't using libpthread at all, or it is |
1053 | statically linked. Since we can't easily distinguish these two cases, | |
1054 | no warning is issued. */ | |
1055 | return 0; | |
1056 | } | |
1057 | ||
fb0e1ba7 | 1058 | static void |
12b6a110 | 1059 | disable_thread_event_reporting (struct thread_db_info *info) |
fb0e1ba7 | 1060 | { |
21e1bee4 | 1061 | if (info->td_ta_clear_event_p != NULL) |
12b6a110 PP |
1062 | { |
1063 | td_thr_events_t events; | |
fb0e1ba7 | 1064 | |
12b6a110 PP |
1065 | /* Set the process wide mask saying we aren't interested in any |
1066 | events anymore. */ | |
21e1bee4 PP |
1067 | td_event_fillset (&events); |
1068 | info->td_ta_clear_event_p (info->thread_agent, &events); | |
12b6a110 | 1069 | } |
fb0e1ba7 | 1070 | |
d90e17a7 PA |
1071 | info->td_create_bp_addr = 0; |
1072 | info->td_death_bp_addr = 0; | |
fb0e1ba7 MK |
1073 | } |
1074 | ||
1075 | static void | |
1076 | check_thread_signals (void) | |
1077 | { | |
21bf60fe | 1078 | if (!thread_signals) |
fb0e1ba7 MK |
1079 | { |
1080 | sigset_t mask; | |
1081 | int i; | |
1082 | ||
669211f5 | 1083 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1084 | sigemptyset (&thread_stop_set); |
1085 | sigemptyset (&thread_print_set); | |
1086 | ||
b9569773 | 1087 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1088 | { |
1089 | if (sigismember (&mask, i)) | |
1090 | { | |
1091 | if (signal_stop_update (target_signal_from_host (i), 0)) | |
1092 | sigaddset (&thread_stop_set, i); | |
1093 | if (signal_print_update (target_signal_from_host (i), 0)) | |
1094 | sigaddset (&thread_print_set, i); | |
1095 | thread_signals = 1; | |
1096 | } | |
1097 | } | |
1098 | } | |
fb0e1ba7 MK |
1099 | } |
1100 | ||
0ec9a092 DJ |
1101 | /* Check whether thread_db is usable. This function is called when |
1102 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1103 | and when new shared libraries are loaded into a running process. */ | |
1104 | ||
1105 | void | |
1106 | check_for_thread_db (void) | |
fb0e1ba7 | 1107 | { |
b5057acd | 1108 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1109 | if (!thread_db_load ()) |
b5057acd | 1110 | return; |
0ec9a092 DJ |
1111 | } |
1112 | ||
0838fb57 DE |
1113 | /* This function is called via the new_objfile observer. */ |
1114 | ||
0ec9a092 DJ |
1115 | static void |
1116 | thread_db_new_objfile (struct objfile *objfile) | |
1117 | { | |
d90e17a7 PA |
1118 | /* This observer must always be called with inferior_ptid set |
1119 | correctly. */ | |
1120 | ||
0838fb57 DE |
1121 | if (objfile != NULL |
1122 | /* Only check for thread_db if we loaded libpthread, | |
1123 | or if this is the main symbol file. | |
1124 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1125 | a statically linked executable AND the symbol file is specified AFTER | |
1126 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1127 | For dynamically linked executables, libpthread can be near the end | |
1128 | of the list of shared libraries to load, and in an app of several | |
1129 | thousand shared libraries, this can otherwise be painful. */ | |
1130 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
1131 | || libpthread_name_p (objfile->name))) | |
0ec9a092 | 1132 | check_for_thread_db (); |
fb0e1ba7 MK |
1133 | } |
1134 | ||
0838fb57 DE |
1135 | /* This function is called via the inferior_created observer. |
1136 | This handles the case of debugging statically linked executables. */ | |
1137 | ||
1138 | static void | |
1139 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1140 | { | |
1141 | check_for_thread_db (); | |
1142 | } | |
1143 | ||
a2f23071 DJ |
1144 | /* Attach to a new thread. This function is called when we receive a |
1145 | TD_CREATE event or when we iterate over all threads and find one | |
02c6c942 | 1146 | that wasn't already in our list. Returns true on success. */ |
a2f23071 | 1147 | |
02c6c942 | 1148 | static int |
39f77062 | 1149 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 1150 | const td_thrinfo_t *ti_p) |
fb0e1ba7 | 1151 | { |
17faa917 | 1152 | struct private_thread_info *private; |
2a2ef594 | 1153 | struct thread_info *tp; |
fb0e1ba7 | 1154 | td_err_e err; |
d90e17a7 | 1155 | struct thread_db_info *info; |
fb0e1ba7 | 1156 | |
a2f23071 DJ |
1157 | /* If we're being called after a TD_CREATE event, we may already |
1158 | know about this thread. There are two ways this can happen. We | |
1159 | may have iterated over all threads between the thread creation | |
1160 | and the TD_CREATE event, for instance when the user has issued | |
1161 | the `info threads' command before the SIGTRAP for hitting the | |
1162 | thread creation breakpoint was reported. Alternatively, the | |
1163 | thread may have exited and a new one been created with the same | |
1164 | thread ID. In the first case we don't need to do anything; in | |
1165 | the second case we should discard information about the dead | |
1166 | thread and attach to the new one. */ | |
2a2ef594 PA |
1167 | tp = find_thread_ptid (ptid); |
1168 | if (tp != NULL) | |
a2f23071 | 1169 | { |
17faa917 DJ |
1170 | /* If tp->private is NULL, then GDB is already attached to this |
1171 | thread, but we do not know anything about it. We can learn | |
1172 | about it here. This can only happen if we have some other | |
1173 | way besides libthread_db to notice new threads (i.e. | |
1174 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread | |
1175 | exit, so this can not be a stale thread recreated with the | |
1176 | same ID. */ | |
1177 | if (tp->private != NULL) | |
1178 | { | |
1179 | if (!tp->private->dying) | |
02c6c942 | 1180 | return 0; |
a2f23071 | 1181 | |
17faa917 DJ |
1182 | delete_thread (ptid); |
1183 | tp = NULL; | |
1184 | } | |
a2f23071 DJ |
1185 | } |
1186 | ||
856d6f99 PA |
1187 | if (target_has_execution) |
1188 | check_thread_signals (); | |
fb0e1ba7 | 1189 | |
9ee57c33 | 1190 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
02c6c942 | 1191 | return 0; /* A zombie thread -- do not attach. */ |
9ee57c33 DJ |
1192 | |
1193 | /* Under GNU/Linux, we have to attach to each and every thread. */ | |
856d6f99 | 1194 | if (target_has_execution |
84636d28 PA |
1195 | && tp == NULL) |
1196 | { | |
1197 | int res; | |
1198 | ||
1199 | res = lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid))); | |
1200 | if (res < 0) | |
1201 | { | |
1202 | /* Error, stop iterating. */ | |
1203 | return 0; | |
1204 | } | |
1205 | else if (res > 0) | |
1206 | { | |
1207 | /* Pretend this thread doesn't exist yet, and keep | |
1208 | iterating. */ | |
1209 | return 1; | |
1210 | } | |
1211 | ||
1212 | /* Otherwise, we sucessfully attached to the thread. */ | |
1213 | } | |
9ee57c33 | 1214 | |
17faa917 DJ |
1215 | /* Construct the thread's private data. */ |
1216 | private = xmalloc (sizeof (struct private_thread_info)); | |
1217 | memset (private, 0, sizeof (struct private_thread_info)); | |
1218 | ||
1219 | /* A thread ID of zero may mean the thread library has not initialized | |
1220 | yet. But we shouldn't even get here if that's the case. FIXME: | |
1221 | if we change GDB to always have at least one thread in the thread | |
1222 | list this will have to go somewhere else; maybe private == NULL | |
1223 | until the thread_db target claims it. */ | |
1224 | gdb_assert (ti_p->ti_tid != 0); | |
1225 | private->th = *th_p; | |
1226 | private->tid = ti_p->ti_tid; | |
1227 | ||
fb0e1ba7 | 1228 | /* Add the thread to GDB's thread list. */ |
17faa917 | 1229 | if (tp == NULL) |
2e456570 | 1230 | add_thread_with_info (ptid, private); |
17faa917 DJ |
1231 | else |
1232 | tp->private = private; | |
5365276c | 1233 | |
d90e17a7 PA |
1234 | info = get_thread_db_info (GET_PID (ptid)); |
1235 | ||
856d6f99 PA |
1236 | /* Enable thread event reporting for this thread, except when |
1237 | debugging a core file. */ | |
1238 | if (target_has_execution) | |
1239 | { | |
1240 | err = info->td_thr_event_enable_p (th_p, 1); | |
1241 | if (err != TD_OK) | |
1242 | error (_("Cannot enable thread event reporting for %s: %s"), | |
1243 | target_pid_to_str (ptid), thread_db_err_str (err)); | |
1244 | } | |
1245 | ||
02c6c942 | 1246 | return 1; |
fb0e1ba7 MK |
1247 | } |
1248 | ||
1249 | static void | |
17faa917 | 1250 | detach_thread (ptid_t ptid) |
fb0e1ba7 | 1251 | { |
a2f23071 DJ |
1252 | struct thread_info *thread_info; |
1253 | ||
a2f23071 DJ |
1254 | /* Don't delete the thread now, because it still reports as active |
1255 | until it has executed a few instructions after the event | |
1256 | breakpoint - if we deleted it now, "info threads" would cause us | |
1257 | to re-attach to it. Just mark it as having had a TD_DEATH | |
1258 | event. This means that we won't delete it from our thread list | |
1259 | until we notice that it's dead (via prune_threads), or until | |
17faa917 DJ |
1260 | something re-uses its thread ID. We'll report the thread exit |
1261 | when the underlying LWP dies. */ | |
e09875d4 | 1262 | thread_info = find_thread_ptid (ptid); |
17faa917 | 1263 | gdb_assert (thread_info != NULL && thread_info->private != NULL); |
a2f23071 | 1264 | thread_info->private->dying = 1; |
fb0e1ba7 MK |
1265 | } |
1266 | ||
1267 | static void | |
136d6dae | 1268 | thread_db_detach (struct target_ops *ops, char *args, int from_tty) |
fb0e1ba7 | 1269 | { |
117de6a9 | 1270 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1271 | struct thread_db_info *info; |
117de6a9 | 1272 | |
d90e17a7 | 1273 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
c194fbe1 | 1274 | |
d90e17a7 PA |
1275 | if (info) |
1276 | { | |
856d6f99 PA |
1277 | if (target_has_execution) |
1278 | { | |
1279 | disable_thread_event_reporting (info); | |
1280 | ||
1281 | /* Delete the old thread event breakpoints. Note that | |
1282 | unlike when mourning, we can remove them here because | |
1283 | there's still a live inferior to poke at. In any case, | |
1284 | GDB will not try to insert anything in the inferior when | |
1285 | removing a breakpoint. */ | |
1286 | remove_thread_event_breakpoints (); | |
1287 | } | |
d90e17a7 PA |
1288 | |
1289 | delete_thread_db_info (GET_PID (inferior_ptid)); | |
1290 | } | |
4105de34 | 1291 | |
7a7d3353 | 1292 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1293 | |
1294 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1295 | ||
1296 | /* If there are no more processes using libpthread, detach the | |
1297 | thread_db target ops. */ | |
1298 | if (!thread_db_list) | |
1299 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1300 | } |
1301 | ||
fb0e1ba7 MK |
1302 | /* Check if PID is currently stopped at the location of a thread event |
1303 | breakpoint location. If it is, read the event message and act upon | |
1304 | the event. */ | |
1305 | ||
1306 | static void | |
39f77062 | 1307 | check_event (ptid_t ptid) |
fb0e1ba7 | 1308 | { |
515630c5 UW |
1309 | struct regcache *regcache = get_thread_regcache (ptid); |
1310 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
fb0e1ba7 MK |
1311 | td_event_msg_t msg; |
1312 | td_thrinfo_t ti; | |
1313 | td_err_e err; | |
1314 | CORE_ADDR stop_pc; | |
4d9850d3 | 1315 | int loop = 0; |
d90e17a7 PA |
1316 | struct thread_db_info *info; |
1317 | ||
1318 | info = get_thread_db_info (GET_PID (ptid)); | |
fb0e1ba7 MK |
1319 | |
1320 | /* Bail out early if we're not at a thread event breakpoint. */ | |
515630c5 UW |
1321 | stop_pc = regcache_read_pc (regcache) |
1322 | - gdbarch_decr_pc_after_break (gdbarch); | |
d90e17a7 PA |
1323 | if (stop_pc != info->td_create_bp_addr |
1324 | && stop_pc != info->td_death_bp_addr) | |
fb0e1ba7 MK |
1325 | return; |
1326 | ||
4c28f408 | 1327 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1328 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
1329 | |
1330 | /* If we have only looked at the first thread before libpthread was | |
1331 | initialized, we may not know its thread ID yet. Make sure we do | |
1332 | before we add another thread to the list. */ | |
d90e17a7 PA |
1333 | if (!have_threads (ptid)) |
1334 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 1335 | |
4d9850d3 JJ |
1336 | /* If we are at a create breakpoint, we do not know what new lwp |
1337 | was created and cannot specifically locate the event message for it. | |
1338 | We have to call td_ta_event_getmsg() to get | |
1339 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 1340 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 1341 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
1342 | This guarantees we will process the correct message before continuing |
1343 | from the breakpoint. | |
4d9850d3 JJ |
1344 | |
1345 | Currently, death events are not enabled. If they are enabled, | |
1346 | the death event can use the td_thr_event_getmsg() interface to | |
1347 | get the message specifically for that lwp and avoid looping | |
1348 | below. */ | |
1349 | ||
1350 | loop = 1; | |
1351 | ||
1352 | do | |
fb0e1ba7 | 1353 | { |
d90e17a7 | 1354 | err = info->td_ta_event_getmsg_p (info->thread_agent, &msg); |
4d9850d3 JJ |
1355 | if (err != TD_OK) |
1356 | { | |
1357 | if (err == TD_NOMSG) | |
1358 | return; | |
fb0e1ba7 | 1359 | |
8a3fe4f8 | 1360 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
1361 | thread_db_err_str (err)); |
1362 | } | |
fb0e1ba7 | 1363 | |
d90e17a7 | 1364 | err = info->td_thr_get_info_p (msg.th_p, &ti); |
4d9850d3 | 1365 | if (err != TD_OK) |
8a3fe4f8 | 1366 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 1367 | |
17faa917 | 1368 | ptid = ptid_build (GET_PID (ptid), ti.ti_lid, 0); |
fb0e1ba7 | 1369 | |
4d9850d3 JJ |
1370 | switch (msg.event) |
1371 | { | |
1372 | case TD_CREATE: | |
a2f23071 DJ |
1373 | /* Call attach_thread whether or not we already know about a |
1374 | thread with this thread ID. */ | |
93815fbf | 1375 | attach_thread (ptid, msg.th_p, &ti); |
fb0e1ba7 | 1376 | |
4d9850d3 | 1377 | break; |
fb0e1ba7 | 1378 | |
4d9850d3 | 1379 | case TD_DEATH: |
fb0e1ba7 | 1380 | |
4d9850d3 | 1381 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 1382 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 1383 | |
17faa917 | 1384 | detach_thread (ptid); |
fb0e1ba7 | 1385 | |
4d9850d3 | 1386 | break; |
fb0e1ba7 | 1387 | |
4d9850d3 | 1388 | default: |
8a3fe4f8 | 1389 | error (_("Spurious thread event.")); |
4d9850d3 | 1390 | } |
fb0e1ba7 | 1391 | } |
4d9850d3 | 1392 | while (loop); |
fb0e1ba7 MK |
1393 | } |
1394 | ||
39f77062 | 1395 | static ptid_t |
117de6a9 | 1396 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1397 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1398 | int options) | |
fb0e1ba7 | 1399 | { |
d90e17a7 | 1400 | struct thread_db_info *info; |
117de6a9 PA |
1401 | struct target_ops *beneath = find_target_beneath (ops); |
1402 | ||
47608cb1 | 1403 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1404 | |
b84876c2 PA |
1405 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1406 | return ptid; | |
1407 | ||
1111f4aa | 1408 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1409 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1410 | return ptid; | |
fb0e1ba7 | 1411 | |
d90e17a7 PA |
1412 | info = get_thread_db_info (GET_PID (ptid)); |
1413 | ||
1414 | /* If this process isn't using thread_db, we're done. */ | |
1415 | if (info == NULL) | |
1416 | return ptid; | |
1417 | ||
3f64f7b1 DJ |
1418 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1419 | { | |
d90e17a7 PA |
1420 | /* New image, it may or may not end up using thread_db. Assume |
1421 | not unless we find otherwise. */ | |
1422 | delete_thread_db_info (GET_PID (ptid)); | |
1423 | if (!thread_db_list) | |
1424 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1425 | |
6c95b8df PA |
1426 | /* Thread event breakpoints are deleted by |
1427 | update_breakpoints_after_exec. */ | |
1428 | ||
49fd4a42 | 1429 | return ptid; |
3f64f7b1 DJ |
1430 | } |
1431 | ||
4105de34 DJ |
1432 | /* If we do not know about the main thread yet, this would be a good time to |
1433 | find it. */ | |
d90e17a7 PA |
1434 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid)) |
1435 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1436 | |
fb0e1ba7 MK |
1437 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
1438 | && ourstatus->value.sig == TARGET_SIGNAL_TRAP) | |
1439 | /* Check for a thread event. */ | |
39f77062 | 1440 | check_event (ptid); |
fb0e1ba7 | 1441 | |
d90e17a7 | 1442 | if (have_threads (ptid)) |
4105de34 DJ |
1443 | { |
1444 | /* Change ptids back into the higher level PID + TID format. If | |
1445 | the thread is dead and no longer on the thread list, we will | |
1446 | get back a dead ptid. This can occur if the thread death | |
1447 | event gets postponed by other simultaneous events. In such a | |
1448 | case, we want to just ignore the event and continue on. */ | |
1449 | ||
4105de34 DJ |
1450 | ptid = thread_from_lwp (ptid); |
1451 | if (GET_PID (ptid) == -1) | |
1452 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
1453 | } | |
fb0e1ba7 | 1454 | |
b9b5d7ea | 1455 | return ptid; |
fb0e1ba7 MK |
1456 | } |
1457 | ||
fb0e1ba7 | 1458 | static void |
136d6dae | 1459 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1460 | { |
117de6a9 PA |
1461 | struct target_ops *target_beneath = find_target_beneath (ops); |
1462 | ||
d90e17a7 | 1463 | delete_thread_db_info (GET_PID (inferior_ptid)); |
fb0e1ba7 | 1464 | |
d90e17a7 PA |
1465 | target_beneath->to_mourn_inferior (target_beneath); |
1466 | ||
6c95b8df PA |
1467 | /* Delete the old thread event breakpoints. Do this after mourning |
1468 | the inferior, so that we don't try to uninsert them. */ | |
1469 | remove_thread_event_breakpoints (); | |
1470 | ||
b26a6851 | 1471 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1472 | if (!thread_db_list) |
1473 | unpush_target (ops); | |
fb0e1ba7 MK |
1474 | } |
1475 | ||
02c6c942 PP |
1476 | struct callback_data |
1477 | { | |
1478 | struct thread_db_info *info; | |
1479 | int new_threads; | |
1480 | }; | |
1481 | ||
fb0e1ba7 MK |
1482 | static int |
1483 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1484 | { | |
1485 | td_thrinfo_t ti; | |
1486 | td_err_e err; | |
39f77062 | 1487 | ptid_t ptid; |
403fe197 | 1488 | struct thread_info *tp; |
02c6c942 PP |
1489 | struct callback_data *cb_data = data; |
1490 | struct thread_db_info *info = cb_data->info; | |
fb0e1ba7 | 1491 | |
d90e17a7 | 1492 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1493 | if (err != TD_OK) |
8a3fe4f8 | 1494 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1495 | thread_db_err_str (err)); |
fb0e1ba7 | 1496 | |
21bf60fe MK |
1497 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
1498 | return 0; /* A zombie -- ignore. */ | |
5fd913cc | 1499 | |
254f582e | 1500 | if (ti.ti_tid == 0) |
4105de34 DJ |
1501 | { |
1502 | /* A thread ID of zero means that this is the main thread, but | |
1503 | glibc has not yet initialized thread-local storage and the | |
1504 | pthread library. We do not know what the thread's TID will | |
1505 | be yet. Just enable event reporting and otherwise ignore | |
1506 | it. */ | |
1507 | ||
4d062f1a PA |
1508 | /* In that case, we're not stopped in a fork syscall and don't |
1509 | need this glibc bug workaround. */ | |
1510 | info->need_stale_parent_threads_check = 0; | |
1511 | ||
254f582e JK |
1512 | if (target_has_execution) |
1513 | { | |
1514 | err = info->td_thr_event_enable_p (th_p, 1); | |
1515 | if (err != TD_OK) | |
1516 | error (_("Cannot enable thread event reporting for LWP %d: %s"), | |
1517 | (int) ti.ti_lid, thread_db_err_str (err)); | |
1518 | } | |
4105de34 DJ |
1519 | |
1520 | return 0; | |
1521 | } | |
1522 | ||
4d062f1a PA |
1523 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1524 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1525 | avoid doing the work if we know we don't have to. */ | |
1526 | if (info->need_stale_parent_threads_check) | |
1527 | { | |
1528 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1529 | |
4d062f1a PA |
1530 | if (tgid != -1 && tgid != info->pid) |
1531 | return 0; | |
1532 | } | |
1533 | ||
1534 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1535 | tp = find_thread_ptid (ptid); |
403fe197 | 1536 | if (tp == NULL || tp->private == NULL) |
02c6c942 PP |
1537 | { |
1538 | if (attach_thread (ptid, th_p, &ti)) | |
1539 | cb_data->new_threads += 1; | |
1540 | else | |
1541 | /* Problem attaching this thread; perhaps it exited before we | |
1542 | could attach it? | |
1543 | This could mean that the thread list inside glibc itself is in | |
1544 | inconsistent state, and libthread_db could go on looping forever | |
1545 | (observed with glibc-2.3.6). To prevent that, terminate | |
1546 | iteration: thread_db_find_new_threads_2 will retry. */ | |
1547 | return 1; | |
1548 | } | |
fb0e1ba7 MK |
1549 | |
1550 | return 0; | |
1551 | } | |
1552 | ||
02c6c942 PP |
1553 | /* Helper for thread_db_find_new_threads_2. |
1554 | Returns number of new threads found. */ | |
1555 | ||
1556 | static int | |
1557 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1558 | td_err_e *errp) |
02c6c942 PP |
1559 | { |
1560 | volatile struct gdb_exception except; | |
1561 | struct callback_data data; | |
fb169834 | 1562 | td_err_e err = TD_ERR; |
02c6c942 PP |
1563 | |
1564 | data.info = info; | |
1565 | data.new_threads = 0; | |
1566 | ||
1567 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
1568 | { | |
1569 | /* Iterate over all user-space threads to discover new threads. */ | |
1570 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1571 | find_new_threads_callback, | |
1572 | &data, | |
1573 | TD_THR_ANY_STATE, | |
1574 | TD_THR_LOWEST_PRIORITY, | |
1575 | TD_SIGNO_MASK, | |
1576 | TD_THR_ANY_USER_FLAGS); | |
1577 | } | |
1578 | ||
02d868e8 | 1579 | if (libthread_db_debug) |
02c6c942 PP |
1580 | { |
1581 | if (except.reason < 0) | |
1582 | exception_fprintf (gdb_stderr, except, | |
1583 | "Warning: find_new_threads_once: "); | |
1584 | ||
1585 | printf_filtered (_("Found %d new threads in iteration %d.\n"), | |
1586 | data.new_threads, iteration); | |
1587 | } | |
1588 | ||
1589 | if (errp != NULL) | |
1590 | *errp = err; | |
1591 | ||
1592 | return data.new_threads; | |
1593 | } | |
1594 | ||
4c28f408 | 1595 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1596 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1597 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1598 | |
fb0e1ba7 | 1599 | static void |
02c6c942 | 1600 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 MK |
1601 | { |
1602 | td_err_e err; | |
d90e17a7 PA |
1603 | struct thread_db_info *info; |
1604 | int pid = ptid_get_pid (ptid); | |
02c6c942 | 1605 | int i, loop; |
4c28f408 | 1606 | |
d90e17a7 PA |
1607 | info = get_thread_db_info (GET_PID (ptid)); |
1608 | ||
4c28f408 | 1609 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1610 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1611 | |
1612 | if (until_no_new) | |
1613 | { | |
1614 | /* Require 4 successive iterations which do not find any new threads. | |
1615 | The 4 is a heuristic: there is an inherent race here, and I have | |
1616 | seen that 2 iterations in a row are not always sufficient to | |
1617 | "capture" all threads. */ | |
1618 | for (i = 0, loop = 0; loop < 4; ++i, ++loop) | |
1619 | if (find_new_threads_once (info, i, NULL) != 0) | |
1620 | /* Found some new threads. Restart the loop from beginning. */ | |
1621 | loop = -1; | |
1622 | } | |
1623 | else | |
1624 | { | |
02c6c942 PP |
1625 | find_new_threads_once (info, 0, &err); |
1626 | if (err != TD_OK) | |
1627 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
1628 | } | |
fb0e1ba7 MK |
1629 | } |
1630 | ||
02c6c942 PP |
1631 | static void |
1632 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1633 | { | |
1634 | thread_db_find_new_threads_2 (ptid, 0); | |
1635 | } | |
1636 | ||
dc146f7c VP |
1637 | static int |
1638 | update_thread_core (struct lwp_info *info, void *closure) | |
1639 | { | |
2e794194 | 1640 | info->core = linux_common_core_of_thread (info->ptid); |
dc146f7c VP |
1641 | return 0; |
1642 | } | |
02c6c942 | 1643 | |
28439f5e PA |
1644 | static void |
1645 | thread_db_find_new_threads (struct target_ops *ops) | |
1646 | { | |
d90e17a7 | 1647 | struct thread_db_info *info; |
c65b3e0d | 1648 | struct inferior *inf; |
d90e17a7 | 1649 | |
c65b3e0d PA |
1650 | ALL_INFERIORS (inf) |
1651 | { | |
1652 | struct thread_info *thread; | |
d90e17a7 | 1653 | |
c65b3e0d PA |
1654 | if (inf->pid == 0) |
1655 | continue; | |
d90e17a7 | 1656 | |
c65b3e0d PA |
1657 | info = get_thread_db_info (inf->pid); |
1658 | if (info == NULL) | |
1659 | continue; | |
1660 | ||
1661 | thread = any_live_thread_of_process (inf->pid); | |
1662 | if (thread == NULL || thread->executing) | |
1663 | continue; | |
1664 | ||
1665 | thread_db_find_new_threads_1 (thread->ptid); | |
1666 | } | |
dc146f7c | 1667 | |
856d6f99 PA |
1668 | if (target_has_execution) |
1669 | iterate_over_lwps (minus_one_ptid /* iterate over all */, | |
1670 | update_thread_core, NULL); | |
28439f5e PA |
1671 | } |
1672 | ||
fb0e1ba7 | 1673 | static char * |
117de6a9 | 1674 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1675 | { |
e09875d4 | 1676 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1677 | struct target_ops *beneath; |
17faa917 DJ |
1678 | |
1679 | if (thread_info != NULL && thread_info->private != NULL) | |
fb0e1ba7 MK |
1680 | { |
1681 | static char buf[64]; | |
17faa917 | 1682 | thread_t tid; |
fb0e1ba7 | 1683 | |
17faa917 | 1684 | tid = thread_info->private->tid; |
17faa917 DJ |
1685 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
1686 | tid, GET_LWP (ptid)); | |
fb0e1ba7 MK |
1687 | |
1688 | return buf; | |
1689 | } | |
1690 | ||
117de6a9 PA |
1691 | beneath = find_target_beneath (ops); |
1692 | if (beneath->to_pid_to_str (beneath, ptid)) | |
1693 | return beneath->to_pid_to_str (beneath, ptid); | |
fb0e1ba7 | 1694 | |
39f77062 | 1695 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1696 | } |
1697 | ||
28b17333 DJ |
1698 | /* Return a string describing the state of the thread specified by |
1699 | INFO. */ | |
1700 | ||
1701 | static char * | |
1702 | thread_db_extra_thread_info (struct thread_info *info) | |
1703 | { | |
17faa917 DJ |
1704 | if (info->private == NULL) |
1705 | return NULL; | |
1706 | ||
28b17333 DJ |
1707 | if (info->private->dying) |
1708 | return "Exiting"; | |
1709 | ||
1710 | return NULL; | |
1711 | } | |
1712 | ||
b2756930 KB |
1713 | /* Get the address of the thread local variable in load module LM which |
1714 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1715 | |
1716 | static CORE_ADDR | |
117de6a9 PA |
1717 | thread_db_get_thread_local_address (struct target_ops *ops, |
1718 | ptid_t ptid, | |
b2756930 | 1719 | CORE_ADDR lm, |
b4acd559 | 1720 | CORE_ADDR offset) |
3f47be5c | 1721 | { |
17faa917 | 1722 | struct thread_info *thread_info; |
117de6a9 | 1723 | struct target_ops *beneath; |
17faa917 | 1724 | |
4105de34 | 1725 | /* If we have not discovered any threads yet, check now. */ |
d90e17a7 PA |
1726 | if (!have_threads (ptid)) |
1727 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1728 | |
17faa917 | 1729 | /* Find the matching thread. */ |
e09875d4 | 1730 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1731 | |
17faa917 | 1732 | if (thread_info != NULL && thread_info->private != NULL) |
3f47be5c | 1733 | { |
3f47be5c | 1734 | td_err_e err; |
00f515da | 1735 | psaddr_t address; |
d90e17a7 PA |
1736 | struct thread_db_info *info; |
1737 | ||
1738 | info = get_thread_db_info (GET_PID (ptid)); | |
3f47be5c EZ |
1739 | |
1740 | /* glibc doesn't provide the needed interface. */ | |
d90e17a7 | 1741 | if (!info->td_thr_tls_get_addr_p) |
109c3e39 AC |
1742 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
1743 | _("No TLS library support")); | |
3f47be5c | 1744 | |
b2756930 KB |
1745 | /* Caller should have verified that lm != 0. */ |
1746 | gdb_assert (lm != 0); | |
3f47be5c | 1747 | |
3f47be5c | 1748 | /* Finally, get the address of the variable. */ |
00f515da DE |
1749 | /* Note the cast through uintptr_t: this interface only works if |
1750 | a target address fits in a psaddr_t, which is a host pointer. | |
1751 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
d90e17a7 | 1752 | err = info->td_thr_tls_get_addr_p (&thread_info->private->th, |
00f515da | 1753 | (psaddr_t)(uintptr_t) lm, |
d90e17a7 | 1754 | offset, &address); |
3f47be5c EZ |
1755 | |
1756 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1757 | /* The memory hasn't been allocated, yet. */ | |
1758 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1759 | /* Now, if libthread_db provided the initialization image's |
1760 | address, we *could* try to build a non-lvalue value from | |
1761 | the initialization image. */ | |
109c3e39 AC |
1762 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1763 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1764 | #endif |
1765 | ||
1766 | /* Something else went wrong. */ | |
1767 | if (err != TD_OK) | |
109c3e39 AC |
1768 | throw_error (TLS_GENERIC_ERROR, |
1769 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1770 | |
1771 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1772 | /* Do proper sign extension for the target. */ |
1773 | gdb_assert (exec_bfd); | |
1774 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1775 | ? (CORE_ADDR) (intptr_t) address | |
1776 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1777 | } |
1778 | ||
117de6a9 PA |
1779 | beneath = find_target_beneath (ops); |
1780 | if (beneath->to_get_thread_local_address) | |
1781 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); | |
93ad78a7 | 1782 | else |
109c3e39 AC |
1783 | throw_error (TLS_GENERIC_ERROR, |
1784 | _("TLS not supported on this target")); | |
3f47be5c EZ |
1785 | } |
1786 | ||
0ef643c8 JB |
1787 | /* Callback routine used to find a thread based on the TID part of |
1788 | its PTID. */ | |
1789 | ||
1790 | static int | |
1791 | thread_db_find_thread_from_tid (struct thread_info *thread, void *data) | |
1792 | { | |
1793 | long *tid = (long *) data; | |
1794 | ||
1795 | if (thread->private->tid == *tid) | |
1796 | return 1; | |
1797 | ||
1798 | return 0; | |
1799 | } | |
1800 | ||
1801 | /* Implement the to_get_ada_task_ptid target method for this target. */ | |
1802 | ||
1803 | static ptid_t | |
1804 | thread_db_get_ada_task_ptid (long lwp, long thread) | |
1805 | { | |
1806 | struct thread_info *thread_info; | |
1807 | ||
d90e17a7 | 1808 | thread_db_find_new_threads_1 (inferior_ptid); |
0ef643c8 JB |
1809 | thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread); |
1810 | ||
1811 | gdb_assert (thread_info != NULL); | |
1812 | ||
1813 | return (thread_info->ptid); | |
1814 | } | |
1815 | ||
4d062f1a PA |
1816 | static void |
1817 | thread_db_resume (struct target_ops *ops, | |
1818 | ptid_t ptid, int step, enum target_signal signo) | |
1819 | { | |
1820 | struct target_ops *beneath = find_target_beneath (ops); | |
1821 | struct thread_db_info *info; | |
1822 | ||
1823 | if (ptid_equal (ptid, minus_one_ptid)) | |
1824 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
1825 | else | |
1826 | info = get_thread_db_info (GET_PID (ptid)); | |
1827 | ||
1828 | /* This workaround is only needed for child fork lwps stopped in a | |
1829 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1830 | workaround can be disabled. */ | |
1831 | if (info) | |
1832 | info->need_stale_parent_threads_check = 0; | |
1833 | ||
1834 | beneath->to_resume (beneath, ptid, step, signo); | |
1835 | } | |
1836 | ||
bf88dd68 JK |
1837 | /* qsort helper function for info_auto_load_libthread_db, sort the |
1838 | thread_db_info pointers primarily by their FILENAME and secondarily by their | |
1839 | PID, both in ascending order. */ | |
1840 | ||
1841 | static int | |
1842 | info_auto_load_libthread_db_compare (const void *ap, const void *bp) | |
1843 | { | |
1844 | struct thread_db_info *a = *(struct thread_db_info **) ap; | |
1845 | struct thread_db_info *b = *(struct thread_db_info **) bp; | |
1846 | int retval; | |
1847 | ||
1848 | retval = strcmp (a->filename, b->filename); | |
1849 | if (retval) | |
1850 | return retval; | |
1851 | ||
1852 | return (a->pid > b->pid) - (a->pid - b->pid); | |
1853 | } | |
1854 | ||
1855 | /* Implement 'info auto-load libthread-db'. */ | |
1856 | ||
1857 | static void | |
1858 | info_auto_load_libthread_db (char *args, int from_tty) | |
1859 | { | |
1860 | struct ui_out *uiout = current_uiout; | |
1861 | const char *cs = args ? args : ""; | |
1862 | struct thread_db_info *info, **array; | |
1863 | unsigned info_count, unique_filenames; | |
1864 | size_t max_filename_len, max_pids_len, pids_len; | |
1865 | struct cleanup *back_to; | |
1866 | char *pids; | |
1867 | int i; | |
1868 | ||
1869 | while (isspace (*cs)) | |
1870 | cs++; | |
1871 | if (*cs) | |
1872 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1873 | ||
1874 | info_count = 0; | |
1875 | for (info = thread_db_list; info; info = info->next) | |
1876 | if (info->filename != NULL) | |
1877 | info_count++; | |
1878 | ||
1879 | array = xmalloc (sizeof (*array) * info_count); | |
1880 | back_to = make_cleanup (xfree, array); | |
1881 | ||
1882 | info_count = 0; | |
1883 | for (info = thread_db_list; info; info = info->next) | |
1884 | if (info->filename != NULL) | |
1885 | array[info_count++] = info; | |
1886 | ||
1887 | /* Sort ARRAY by filenames and PIDs. */ | |
1888 | ||
1889 | qsort (array, info_count, sizeof (*array), | |
1890 | info_auto_load_libthread_db_compare); | |
1891 | ||
1892 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1893 | length of PIDs list for the unique filenames (columns). */ | |
1894 | ||
1895 | unique_filenames = 0; | |
1896 | max_filename_len = 0; | |
1897 | max_pids_len = 0; | |
1898 | pids_len = 0; | |
1899 | for (i = 0; i < info_count; i++) | |
1900 | { | |
1901 | int pid = array[i]->pid; | |
1902 | size_t this_pid_len; | |
1903 | ||
1904 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1905 | this_pid_len++; | |
1906 | ||
1907 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1908 | { | |
1909 | unique_filenames++; | |
1910 | max_filename_len = max (max_filename_len, | |
1911 | strlen (array[i]->filename)); | |
1912 | ||
1913 | if (i > 0) | |
1914 | { | |
1915 | pids_len -= strlen (", "); | |
1916 | max_pids_len = max (max_pids_len, pids_len); | |
1917 | } | |
1918 | pids_len = 0; | |
1919 | } | |
1920 | pids_len += this_pid_len + strlen (", "); | |
1921 | } | |
1922 | if (i) | |
1923 | { | |
1924 | pids_len -= strlen (", "); | |
1925 | max_pids_len = max (max_pids_len, pids_len); | |
1926 | } | |
1927 | ||
1928 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1929 | its columns. */ | |
1930 | if (info_count > 0 && args == auto_load_info_scripts_pattern_nl) | |
1931 | ui_out_text (uiout, "\n"); | |
1932 | ||
1933 | make_cleanup_ui_out_table_begin_end (uiout, 2, unique_filenames, | |
1934 | "LinuxThreadDbTable"); | |
1935 | ||
1936 | ui_out_table_header (uiout, max_filename_len, ui_left, "filename", | |
1937 | "Filename"); | |
1938 | ui_out_table_header (uiout, pids_len, ui_left, "PIDs", "Pids"); | |
1939 | ui_out_table_body (uiout); | |
1940 | ||
1941 | pids = xmalloc (max_pids_len + 1); | |
1942 | make_cleanup (xfree, pids); | |
1943 | ||
1944 | /* Note I is incremented inside the cycle, not at its end. */ | |
1945 | for (i = 0; i < info_count;) | |
1946 | { | |
1947 | struct cleanup *chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); | |
1948 | char *pids_end; | |
1949 | ||
1950 | info = array[i]; | |
1951 | ui_out_field_string (uiout, "filename", info->filename); | |
1952 | pids_end = pids; | |
1953 | ||
1954 | while (i < info_count && strcmp (info->filename, array[i]->filename) == 0) | |
1955 | { | |
1956 | if (pids_end != pids) | |
1957 | { | |
1958 | *pids_end++ = ','; | |
1959 | *pids_end++ = ' '; | |
1960 | } | |
1961 | pids_end += xsnprintf (pids_end, &pids[max_pids_len + 1] - pids_end, | |
1962 | "%u", array[i]->pid); | |
1963 | gdb_assert (pids_end < &pids[max_pids_len + 1]); | |
1964 | ||
1965 | i++; | |
1966 | } | |
1967 | *pids_end = '\0'; | |
1968 | ||
1969 | ui_out_field_string (uiout, "pids", pids); | |
1970 | ||
1971 | ui_out_text (uiout, "\n"); | |
1972 | do_cleanups (chain); | |
1973 | } | |
1974 | ||
1975 | do_cleanups (back_to); | |
1976 | ||
1977 | if (info_count == 0) | |
1978 | ui_out_message (uiout, 0, _("No auto-loaded libthread-db.\n")); | |
1979 | } | |
1980 | ||
fb0e1ba7 MK |
1981 | static void |
1982 | init_thread_db_ops (void) | |
1983 | { | |
1984 | thread_db_ops.to_shortname = "multi-thread"; | |
1985 | thread_db_ops.to_longname = "multi-threaded child process."; | |
1986 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
1987 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 1988 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 1989 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 1990 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
fb0e1ba7 MK |
1991 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
1992 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
1993 | thread_db_ops.to_stratum = thread_stratum; | |
1994 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
1995 | thread_db_ops.to_get_thread_local_address |
1996 | = thread_db_get_thread_local_address; | |
28b17333 | 1997 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 1998 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 MK |
1999 | thread_db_ops.to_magic = OPS_MAGIC; |
2000 | } | |
2001 | ||
2c0b251b PA |
2002 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
2003 | extern initialize_file_ftype _initialize_thread_db; | |
2004 | ||
fb0e1ba7 MK |
2005 | void |
2006 | _initialize_thread_db (void) | |
2007 | { | |
17a37d48 PP |
2008 | init_thread_db_ops (); |
2009 | add_target (&thread_db_ops); | |
2010 | ||
2011 | /* Defer loading of libthread_db.so until inferior is running. | |
2012 | This allows gdb to load correct libthread_db for a given | |
2013 | executable -- there could be mutiple versions of glibc, | |
2014 | compiled with LinuxThreads or NPTL, and until there is | |
2015 | a running inferior, we can't tell which libthread_db is | |
1777feb0 | 2016 | the correct one to load. */ |
17a37d48 PP |
2017 | |
2018 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
2019 | ||
2020 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
2021 | class_support, | |
2022 | &libthread_db_search_path, _("\ | |
2023 | Set search path for libthread_db."), _("\ | |
2024 | Show the current search path or libthread_db."), _("\ | |
2025 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
2026 | gdb itself.\n\ |
2027 | Its value is a colon (':') separate list of directories to search.\n\ | |
2028 | Setting the search path to an empty list resets it to its default value."), | |
2029 | set_libthread_db_search_path, | |
17a37d48 PP |
2030 | NULL, |
2031 | &setlist, &showlist); | |
02d868e8 PP |
2032 | |
2033 | add_setshow_zinteger_cmd ("libthread-db", class_maintenance, | |
2034 | &libthread_db_debug, _("\ | |
2035 | Set libthread-db debugging."), _("\ | |
2036 | Show libthread-db debugging."), _("\ | |
2037 | When non-zero, libthread-db debugging is enabled."), | |
2038 | NULL, | |
2039 | show_libthread_db_debug, | |
2040 | &setdebuglist, &showdebuglist); | |
2041 | ||
bf88dd68 JK |
2042 | add_setshow_boolean_cmd ("libthread-db", class_support, |
2043 | &auto_load_thread_db, _("\ | |
2044 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
2045 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
2046 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
2047 | locations to load libthread_db compatible with the inferior.\n\ | |
2048 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
2049 | This options has security implications for untrusted inferiors."), | |
2050 | NULL, show_auto_load_thread_db, | |
2051 | auto_load_set_cmdlist_get (), | |
2052 | auto_load_show_cmdlist_get ()); | |
2053 | ||
2054 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
2055 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
2056 | Usage: info auto-load libthread-db"), | |
2057 | auto_load_info_cmdlist_get ()); | |
2058 | ||
17a37d48 PP |
2059 | /* Add ourselves to objfile event chain. */ |
2060 | observer_attach_new_objfile (thread_db_new_objfile); | |
0838fb57 DE |
2061 | |
2062 | /* Add ourselves to inferior_created event chain. | |
2063 | This is needed to handle debugging statically linked programs where | |
2064 | the new_objfile observer won't get called for libpthread. */ | |
2065 | observer_attach_inferior_created (thread_db_inferior_created); | |
fb0e1ba7 | 2066 | } |