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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 | |
17faa917 DJ |
49 | /* GNU/Linux libthread_db support. |
50 | ||
51 | libthread_db is a library, provided along with libpthread.so, which | |
52 | exposes the internals of the thread library to a debugger. It | |
53 | allows GDB to find existing threads, new threads as they are | |
54 | created, thread IDs (usually, the result of pthread_self), and | |
55 | thread-local variables. | |
56 | ||
57 | The libthread_db interface originates on Solaris, where it is | |
58 | both more powerful and more complicated. This implementation | |
59 | only works for LinuxThreads and NPTL, the two glibc threading | |
60 | libraries. It assumes that each thread is permanently assigned | |
61 | to a single light-weight process (LWP). | |
62 | ||
63 | libthread_db-specific information is stored in the "private" field | |
64 | of struct thread_info. When the field is NULL we do not yet have | |
65 | information about the new thread; this could be temporary (created, | |
66 | but the thread library's data structures do not reflect it yet) | |
67 | or permanent (created using clone instead of pthread_create). | |
68 | ||
69 | Process IDs managed by linux-thread-db.c match those used by | |
70 | linux-nat.c: a common PID for all processes, an LWP ID for each | |
71 | thread, and no TID. We save the TID in private. Keeping it out | |
72 | of the ptid_t prevents thread IDs changing when libpthread is | |
73 | loaded or unloaded. */ | |
74 | ||
17a37d48 PP |
75 | static char *libthread_db_search_path; |
76 | ||
bf88dd68 JK |
77 | /* Set to non-zero if thread_db auto-loading is enabled |
78 | by the "set auto-load libthread-db" command. */ | |
79 | static int auto_load_thread_db = 1; | |
80 | ||
81 | /* "show" command for the auto_load_thread_db configuration variable. */ | |
82 | ||
83 | static void | |
84 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
85 | struct cmd_list_element *c, const char *value) | |
86 | { | |
87 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
88 | "is %s.\n"), | |
89 | value); | |
90 | } | |
91 | ||
84e578fb DE |
92 | static void |
93 | set_libthread_db_search_path (char *ignored, int from_tty, | |
94 | struct cmd_list_element *c) | |
95 | { | |
96 | if (*libthread_db_search_path == '\0') | |
97 | { | |
98 | xfree (libthread_db_search_path); | |
99 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
100 | } | |
101 | } | |
102 | ||
02d868e8 PP |
103 | /* If non-zero, print details of libthread_db processing. */ |
104 | ||
105 | static int libthread_db_debug; | |
106 | ||
107 | static void | |
108 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
109 | struct cmd_list_element *c, const char *value) | |
110 | { | |
111 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
112 | } | |
113 | ||
8605d56e AC |
114 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
115 | threads. */ | |
fb0e1ba7 | 116 | |
fb0e1ba7 MK |
117 | /* This module's target vector. */ |
118 | static struct target_ops thread_db_ops; | |
119 | ||
fb0e1ba7 MK |
120 | /* Non-zero if we have determined the signals used by the threads |
121 | library. */ | |
122 | static int thread_signals; | |
123 | static sigset_t thread_stop_set; | |
124 | static sigset_t thread_print_set; | |
125 | ||
d90e17a7 PA |
126 | struct thread_db_info |
127 | { | |
128 | struct thread_db_info *next; | |
129 | ||
130 | /* Process id this object refers to. */ | |
131 | int pid; | |
132 | ||
133 | /* Handle from dlopen for libthread_db.so. */ | |
134 | void *handle; | |
135 | ||
bf88dd68 JK |
136 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
137 | HANDLE. It may be NULL for system library. */ | |
138 | char *filename; | |
139 | ||
d90e17a7 PA |
140 | /* Structure that identifies the child process for the |
141 | <proc_service.h> interface. */ | |
142 | struct ps_prochandle proc_handle; | |
143 | ||
144 | /* Connection to the libthread_db library. */ | |
145 | td_thragent_t *thread_agent; | |
146 | ||
4d062f1a PA |
147 | /* True if we need to apply the workaround for glibc/BZ5983. When |
148 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
149 | list, nptl_db returns the parent's threads in addition to the new | |
150 | (single) child thread. If this flag is set, we do extra work to | |
151 | be able to ignore such stale entries. */ | |
152 | int need_stale_parent_threads_check; | |
153 | ||
d90e17a7 PA |
154 | /* Location of the thread creation event breakpoint. The code at |
155 | this location in the child process will be called by the pthread | |
156 | library whenever a new thread is created. By setting a special | |
157 | breakpoint at this location, GDB can detect when a new thread is | |
158 | created. We obtain this location via the td_ta_event_addr | |
159 | call. */ | |
160 | CORE_ADDR td_create_bp_addr; | |
fb0e1ba7 | 161 | |
d90e17a7 PA |
162 | /* Location of the thread death event breakpoint. */ |
163 | CORE_ADDR td_death_bp_addr; | |
fb0e1ba7 | 164 | |
d90e17a7 | 165 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 166 | |
d90e17a7 | 167 | td_err_e (*td_init_p) (void); |
fb0e1ba7 | 168 | |
d90e17a7 | 169 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
b4acd559 | 170 | td_thragent_t **ta); |
d90e17a7 PA |
171 | td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
172 | td_thrhandle_t *__th); | |
173 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, | |
174 | lwpid_t lwpid, td_thrhandle_t *th); | |
175 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
176 | td_thr_iter_f *callback, void *cbdata_p, | |
177 | td_thr_state_e state, int ti_pri, | |
178 | sigset_t *ti_sigmask_p, | |
179 | unsigned int ti_user_flags); | |
180 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
181 | td_event_e event, td_notify_t *ptr); | |
182 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
183 | td_thr_events_t *event); | |
21e1bee4 PP |
184 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
185 | td_thr_events_t *event); | |
d90e17a7 PA |
186 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
187 | td_event_msg_t *msg); | |
188 | ||
189 | td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
190 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
191 | td_thrinfo_t *infop); | |
192 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, | |
193 | int event); | |
194 | ||
195 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
196 | psaddr_t map_address, |
197 | size_t offset, psaddr_t *address); | |
d90e17a7 PA |
198 | }; |
199 | ||
200 | /* List of known processes using thread_db, and the required | |
201 | bookkeeping. */ | |
202 | struct thread_db_info *thread_db_list; | |
203 | ||
204 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 205 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 PA |
206 | |
207 | /* Add the current inferior to the list of processes using libpthread. | |
208 | Return a pointer to the newly allocated object that was added to | |
209 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
210 | LIBTHREAD_DB_SO. */ | |
211 | ||
212 | static struct thread_db_info * | |
213 | add_thread_db_info (void *handle) | |
214 | { | |
d90e17a7 PA |
215 | struct thread_db_info *info; |
216 | ||
217 | info = xcalloc (1, sizeof (*info)); | |
218 | info->pid = ptid_get_pid (inferior_ptid); | |
219 | info->handle = handle; | |
856d6f99 PA |
220 | |
221 | /* The workaround works by reading from /proc/pid/status, so it is | |
222 | disabled for core files. */ | |
223 | if (target_has_execution) | |
224 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
225 | |
226 | info->next = thread_db_list; | |
227 | thread_db_list = info; | |
228 | ||
229 | return info; | |
230 | } | |
231 | ||
232 | /* Return the thread_db_info object representing the bookkeeping | |
233 | related to process PID, if any; NULL otherwise. */ | |
234 | ||
235 | static struct thread_db_info * | |
236 | get_thread_db_info (int pid) | |
237 | { | |
238 | struct thread_db_info *info; | |
239 | ||
240 | for (info = thread_db_list; info; info = info->next) | |
241 | if (pid == info->pid) | |
242 | return info; | |
243 | ||
244 | return NULL; | |
245 | } | |
246 | ||
247 | /* When PID has exited or has been detached, we no longer want to keep | |
248 | track of it as using libpthread. Call this function to discard | |
249 | thread_db related info related to PID. Note that this closes | |
250 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
251 | ||
252 | static void | |
253 | delete_thread_db_info (int pid) | |
254 | { | |
255 | struct thread_db_info *info, *info_prev; | |
256 | ||
257 | info_prev = NULL; | |
258 | ||
259 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
260 | if (pid == info->pid) | |
261 | break; | |
262 | ||
263 | if (info == NULL) | |
264 | return; | |
265 | ||
266 | if (info->handle != NULL) | |
267 | dlclose (info->handle); | |
268 | ||
bf88dd68 JK |
269 | xfree (info->filename); |
270 | ||
d90e17a7 PA |
271 | if (info_prev) |
272 | info_prev->next = info->next; | |
273 | else | |
274 | thread_db_list = info->next; | |
275 | ||
276 | xfree (info); | |
277 | } | |
fb0e1ba7 MK |
278 | |
279 | /* Prototypes for local functions. */ | |
02c6c942 PP |
280 | static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
281 | const td_thrinfo_t *ti_p); | |
17faa917 | 282 | static void detach_thread (ptid_t ptid); |
fb0e1ba7 MK |
283 | \f |
284 | ||
5365276c DJ |
285 | /* Use "struct private_thread_info" to cache thread state. This is |
286 | a substantial optimization. */ | |
287 | ||
fb0e1ba7 MK |
288 | struct private_thread_info |
289 | { | |
a2f23071 DJ |
290 | /* Flag set when we see a TD_DEATH event for this thread. */ |
291 | unsigned int dying:1; | |
292 | ||
5365276c | 293 | /* Cached thread state. */ |
5365276c | 294 | td_thrhandle_t th; |
17faa917 | 295 | thread_t tid; |
fb0e1ba7 | 296 | }; |
fb0e1ba7 | 297 | \f |
21bf60fe | 298 | |
fb0e1ba7 MK |
299 | static char * |
300 | thread_db_err_str (td_err_e err) | |
301 | { | |
302 | static char buf[64]; | |
303 | ||
304 | switch (err) | |
305 | { | |
306 | case TD_OK: | |
307 | return "generic 'call succeeded'"; | |
308 | case TD_ERR: | |
309 | return "generic error"; | |
310 | case TD_NOTHR: | |
311 | return "no thread to satisfy query"; | |
312 | case TD_NOSV: | |
313 | return "no sync handle to satisfy query"; | |
314 | case TD_NOLWP: | |
315 | return "no LWP to satisfy query"; | |
316 | case TD_BADPH: | |
317 | return "invalid process handle"; | |
318 | case TD_BADTH: | |
319 | return "invalid thread handle"; | |
320 | case TD_BADSH: | |
321 | return "invalid synchronization handle"; | |
322 | case TD_BADTA: | |
323 | return "invalid thread agent"; | |
324 | case TD_BADKEY: | |
325 | return "invalid key"; | |
326 | case TD_NOMSG: | |
327 | return "no event message for getmsg"; | |
328 | case TD_NOFPREGS: | |
329 | return "FPU register set not available"; | |
330 | case TD_NOLIBTHREAD: | |
331 | return "application not linked with libthread"; | |
332 | case TD_NOEVENT: | |
333 | return "requested event is not supported"; | |
334 | case TD_NOCAPAB: | |
335 | return "capability not available"; | |
336 | case TD_DBERR: | |
337 | return "debugger service failed"; | |
338 | case TD_NOAPLIC: | |
339 | return "operation not applicable to"; | |
340 | case TD_NOTSD: | |
341 | return "no thread-specific data for this thread"; | |
342 | case TD_MALLOC: | |
343 | return "malloc failed"; | |
344 | case TD_PARTIALREG: | |
345 | return "only part of register set was written/read"; | |
346 | case TD_NOXREGS: | |
347 | return "X register set not available for this thread"; | |
59f80f10 DJ |
348 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
349 | case TD_NOTALLOC: | |
350 | return "thread has not yet allocated TLS for given module"; | |
351 | #endif | |
352 | #ifdef THREAD_DB_HAS_TD_VERSION | |
353 | case TD_VERSION: | |
354 | return "versions of libpthread and libthread_db do not match"; | |
355 | #endif | |
356 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
357 | case TD_NOTLS: | |
358 | return "there is no TLS segment in the given module"; | |
359 | #endif | |
fb0e1ba7 MK |
360 | default: |
361 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
362 | return buf; | |
363 | } | |
364 | } | |
fb0e1ba7 | 365 | \f |
4105de34 DJ |
366 | /* Return 1 if any threads have been registered. There may be none if |
367 | the threading library is not fully initialized yet. */ | |
368 | ||
369 | static int | |
d90e17a7 | 370 | have_threads_callback (struct thread_info *thread, void *args) |
4105de34 | 371 | { |
d90e17a7 | 372 | int pid = * (int *) args; |
e0881a8e | 373 | |
d90e17a7 PA |
374 | if (ptid_get_pid (thread->ptid) != pid) |
375 | return 0; | |
376 | ||
e3bc4218 | 377 | return thread->private != NULL; |
4105de34 DJ |
378 | } |
379 | ||
380 | static int | |
d90e17a7 | 381 | have_threads (ptid_t ptid) |
4105de34 | 382 | { |
d90e17a7 PA |
383 | int pid = ptid_get_pid (ptid); |
384 | ||
385 | return iterate_over_threads (have_threads_callback, &pid) != NULL; | |
4105de34 DJ |
386 | } |
387 | ||
d90e17a7 PA |
388 | struct thread_get_info_inout |
389 | { | |
390 | struct thread_info *thread_info; | |
391 | struct thread_db_info *thread_db_info; | |
392 | }; | |
393 | ||
5365276c | 394 | /* A callback function for td_ta_thr_iter, which we use to map all |
cdbc0b18 | 395 | threads to LWPs. |
5365276c DJ |
396 | |
397 | THP is a handle to the current thread; if INFOP is not NULL, the | |
398 | struct thread_info associated with this thread is returned in | |
b9b5d7ea JJ |
399 | *INFOP. |
400 | ||
401 | If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, | |
402 | zero is returned to indicate success. */ | |
5365276c DJ |
403 | |
404 | static int | |
d90e17a7 | 405 | thread_get_info_callback (const td_thrhandle_t *thp, void *argp) |
5365276c DJ |
406 | { |
407 | td_thrinfo_t ti; | |
408 | td_err_e err; | |
5365276c | 409 | ptid_t thread_ptid; |
d90e17a7 PA |
410 | struct thread_get_info_inout *inout; |
411 | struct thread_db_info *info; | |
412 | ||
413 | inout = argp; | |
414 | info = inout->thread_db_info; | |
5365276c | 415 | |
d90e17a7 | 416 | err = info->td_thr_get_info_p (thp, &ti); |
5365276c | 417 | if (err != TD_OK) |
8a3fe4f8 | 418 | error (_("thread_get_info_callback: cannot get thread info: %s"), |
5365276c DJ |
419 | thread_db_err_str (err)); |
420 | ||
421 | /* Fill the cache. */ | |
d90e17a7 | 422 | thread_ptid = ptid_build (info->pid, ti.ti_lid, 0); |
e09875d4 | 423 | inout->thread_info = find_thread_ptid (thread_ptid); |
5365276c | 424 | |
d90e17a7 | 425 | if (inout->thread_info == NULL) |
5365276c DJ |
426 | { |
427 | /* New thread. Attach to it now (why wait?). */ | |
d90e17a7 PA |
428 | if (!have_threads (thread_ptid)) |
429 | thread_db_find_new_threads_1 (thread_ptid); | |
4c28f408 PA |
430 | else |
431 | attach_thread (thread_ptid, thp, &ti); | |
e09875d4 | 432 | inout->thread_info = find_thread_ptid (thread_ptid); |
d90e17a7 | 433 | gdb_assert (inout->thread_info != NULL); |
5365276c DJ |
434 | } |
435 | ||
5365276c DJ |
436 | return 0; |
437 | } | |
5365276c | 438 | \f |
64776a0b | 439 | /* Fetch the user-level thread id of PTID. */ |
fb0e1ba7 | 440 | |
64776a0b | 441 | static void |
39f77062 | 442 | thread_from_lwp (ptid_t ptid) |
fb0e1ba7 | 443 | { |
fb0e1ba7 MK |
444 | td_thrhandle_t th; |
445 | td_err_e err; | |
d90e17a7 PA |
446 | struct thread_db_info *info; |
447 | struct thread_get_info_inout io = {0}; | |
fb0e1ba7 | 448 | |
6cb9b55b PP |
449 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
450 | th.th_unique = 0; | |
451 | ||
17faa917 DJ |
452 | /* This ptid comes from linux-nat.c, which should always fill in the |
453 | LWP. */ | |
454 | gdb_assert (GET_LWP (ptid) != 0); | |
fb0e1ba7 | 455 | |
d90e17a7 PA |
456 | info = get_thread_db_info (GET_PID (ptid)); |
457 | ||
4c28f408 | 458 | /* Access an lwp we know is stopped. */ |
d90e17a7 PA |
459 | info->proc_handle.ptid = ptid; |
460 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); | |
fb0e1ba7 | 461 | if (err != TD_OK) |
8a3fe4f8 | 462 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
39f77062 | 463 | GET_LWP (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 464 | |
64776a0b | 465 | /* Long-winded way of fetching the thread info. */ |
d90e17a7 PA |
466 | io.thread_db_info = info; |
467 | io.thread_info = NULL; | |
64776a0b | 468 | thread_get_info_callback (&th, &io); |
fb0e1ba7 MK |
469 | } |
470 | \f | |
471 | ||
4c28f408 PA |
472 | /* Attach to lwp PTID, doing whatever else is required to have this |
473 | LWP under the debugger's control --- e.g., enabling event | |
474 | reporting. Returns true on success. */ | |
475 | int | |
476 | thread_db_attach_lwp (ptid_t ptid) | |
477 | { | |
478 | td_thrhandle_t th; | |
479 | td_thrinfo_t ti; | |
480 | td_err_e err; | |
d90e17a7 | 481 | struct thread_db_info *info; |
4c28f408 | 482 | |
d90e17a7 PA |
483 | info = get_thread_db_info (GET_PID (ptid)); |
484 | ||
485 | if (info == NULL) | |
4c28f408 PA |
486 | return 0; |
487 | ||
488 | /* This ptid comes from linux-nat.c, which should always fill in the | |
489 | LWP. */ | |
490 | gdb_assert (GET_LWP (ptid) != 0); | |
491 | ||
492 | /* Access an lwp we know is stopped. */ | |
d90e17a7 | 493 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
494 | |
495 | /* If we have only looked at the first thread before libpthread was | |
496 | initialized, we may not know its thread ID yet. Make sure we do | |
497 | before we add another thread to the list. */ | |
d90e17a7 PA |
498 | if (!have_threads (ptid)) |
499 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 500 | |
d90e17a7 | 501 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th); |
4c28f408 PA |
502 | if (err != TD_OK) |
503 | /* Cannot find user-level thread. */ | |
504 | return 0; | |
505 | ||
d90e17a7 | 506 | err = info->td_thr_get_info_p (&th, &ti); |
4c28f408 PA |
507 | if (err != TD_OK) |
508 | { | |
509 | warning (_("Cannot get thread info: %s"), thread_db_err_str (err)); | |
510 | return 0; | |
511 | } | |
512 | ||
513 | attach_thread (ptid, &th, &ti); | |
514 | return 1; | |
515 | } | |
516 | ||
5220ea4c AC |
517 | static void * |
518 | verbose_dlsym (void *handle, const char *name) | |
519 | { | |
520 | void *sym = dlsym (handle, name); | |
521 | if (sym == NULL) | |
3e43a32a MS |
522 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
523 | name, dlerror ()); | |
5220ea4c AC |
524 | return sym; |
525 | } | |
526 | ||
cdbc0b18 | 527 | static td_err_e |
d90e17a7 | 528 | enable_thread_event (int event, CORE_ADDR *bp) |
24557e30 AC |
529 | { |
530 | td_notify_t notify; | |
cdbc0b18 | 531 | td_err_e err; |
d90e17a7 PA |
532 | struct thread_db_info *info; |
533 | ||
534 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
24557e30 | 535 | |
4c28f408 | 536 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 537 | info->proc_handle.ptid = inferior_ptid; |
4c28f408 | 538 | |
24557e30 | 539 | /* Get the breakpoint address for thread EVENT. */ |
d90e17a7 | 540 | err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify); |
24557e30 | 541 | if (err != TD_OK) |
cdbc0b18 | 542 | return err; |
24557e30 AC |
543 | |
544 | /* Set up the breakpoint. */ | |
16451949 AS |
545 | gdb_assert (exec_bfd); |
546 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
a97b0ac8 | 547 | (target_gdbarch, |
16451949 AS |
548 | /* Do proper sign extension for the target. */ |
549 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
550 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
551 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
552 | ¤t_target)); | |
a6d9a66e | 553 | create_thread_event_breakpoint (target_gdbarch, *bp); |
24557e30 | 554 | |
cdbc0b18 | 555 | return TD_OK; |
24557e30 AC |
556 | } |
557 | ||
fcb44371 JK |
558 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
559 | return 1 if this version is lower (and not equal) to | |
560 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
561 | ||
562 | static int | |
563 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
564 | { | |
565 | struct minimal_symbol *version_msym; | |
566 | CORE_ADDR version_addr; | |
567 | char *version; | |
568 | int err, got, retval = 0; | |
569 | ||
570 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
571 | if (version_msym == NULL) | |
572 | return 0; | |
573 | ||
574 | version_addr = SYMBOL_VALUE_ADDRESS (version_msym); | |
575 | got = target_read_string (version_addr, &version, 32, &err); | |
576 | if (err == 0 && memchr (version, 0, got) == &version[got -1]) | |
577 | { | |
578 | int major, minor; | |
579 | ||
580 | retval = (sscanf (version, "%d.%d", &major, &minor) == 2 | |
581 | && (major < ver_major_min | |
582 | || (major == ver_major_min && minor < ver_minor_min))); | |
583 | } | |
584 | xfree (version); | |
585 | ||
586 | return retval; | |
587 | } | |
588 | ||
fb0e1ba7 MK |
589 | static void |
590 | enable_thread_event_reporting (void) | |
591 | { | |
592 | td_thr_events_t events; | |
fb0e1ba7 | 593 | td_err_e err; |
d90e17a7 PA |
594 | struct thread_db_info *info; |
595 | ||
596 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
fb0e1ba7 MK |
597 | |
598 | /* We cannot use the thread event reporting facility if these | |
599 | functions aren't available. */ | |
d90e17a7 PA |
600 | if (info->td_ta_event_addr_p == NULL |
601 | || info->td_ta_set_event_p == NULL | |
602 | || info->td_ta_event_getmsg_p == NULL | |
603 | || info->td_thr_event_enable_p == NULL) | |
fb0e1ba7 MK |
604 | return; |
605 | ||
606 | /* Set the process wide mask saying which events we're interested in. */ | |
607 | td_event_emptyset (&events); | |
608 | td_event_addset (&events, TD_CREATE); | |
a2f23071 | 609 | |
8775fd2d JK |
610 | /* There is a bug fixed between linuxthreads 2.1.3 and 2.2 by |
611 | commit 2e4581e4fba917f1779cd0a010a45698586c190a | |
612 | * manager.c (pthread_exited): Correctly report event as TD_REAP | |
613 | instead of TD_DEATH. Fix comments. | |
614 | where event reporting facility is broken for TD_DEATH events, | |
615 | so don't enable it if we have glibc but a lower version. */ | |
616 | if (!inferior_has_bug ("__linuxthreads_version", 2, 2)) | |
a2f23071 | 617 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 | 618 | |
d90e17a7 | 619 | err = info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
620 | if (err != TD_OK) |
621 | { | |
8a3fe4f8 | 622 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
623 | thread_db_err_str (err)); |
624 | return; | |
625 | } | |
626 | ||
627 | /* Delete previous thread event breakpoints, if any. */ | |
628 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
629 | info->td_create_bp_addr = 0; |
630 | info->td_death_bp_addr = 0; | |
fb0e1ba7 | 631 | |
24557e30 | 632 | /* Set up the thread creation event. */ |
d90e17a7 | 633 | err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr); |
cdbc0b18 | 634 | if (err != TD_OK) |
fb0e1ba7 | 635 | { |
8a3fe4f8 | 636 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
637 | thread_db_err_str (err)); |
638 | return; | |
639 | } | |
640 | ||
24557e30 | 641 | /* Set up the thread death event. */ |
d90e17a7 | 642 | err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr); |
cdbc0b18 | 643 | if (err != TD_OK) |
fb0e1ba7 | 644 | { |
8a3fe4f8 | 645 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
646 | thread_db_err_str (err)); |
647 | return; | |
648 | } | |
fb0e1ba7 MK |
649 | } |
650 | ||
fcb44371 JK |
651 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
652 | if appropriate. | |
456b0e24 | 653 | |
fcb44371 JK |
654 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
655 | otherwise. */ | |
656 | ||
657 | static int | |
456b0e24 PP |
658 | thread_db_find_new_threads_silently (ptid_t ptid) |
659 | { | |
660 | volatile struct gdb_exception except; | |
661 | ||
662 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
663 | { | |
02c6c942 | 664 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
665 | } |
666 | ||
fcb44371 | 667 | if (except.reason < 0) |
e0881a8e | 668 | { |
fcb44371 JK |
669 | if (libthread_db_debug) |
670 | exception_fprintf (gdb_stderr, except, | |
671 | "Warning: thread_db_find_new_threads_silently: "); | |
672 | ||
673 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
674 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
675 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
676 | executables if td_thr_get_info is called before glibc has initialized | |
677 | itself. | |
678 | ||
679 | If the nptl bug is NOT present in the inferior and still thread_db | |
680 | reports an error return 1. It means the inferior has corrupted thread | |
681 | list and GDB should fall back only to LWPs. | |
682 | ||
683 | If the nptl bug is present in the inferior return 0 to silently ignore | |
684 | such errors, and let gdb enumerate threads again later. In such case | |
685 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
686 | corrupted. For core files it does not apply, no 'later enumeration' |
687 | is possible. */ | |
fcb44371 | 688 | |
889003ed | 689 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
690 | { |
691 | exception_fprintf (gdb_stderr, except, | |
692 | _("Warning: couldn't activate thread debugging " | |
693 | "using libthread_db: ")); | |
694 | return 1; | |
695 | } | |
e0881a8e | 696 | } |
fcb44371 | 697 | return 0; |
456b0e24 PP |
698 | } |
699 | ||
d90e17a7 PA |
700 | /* Lookup a library in which given symbol resides. |
701 | Note: this is looking in GDB process, not in the inferior. | |
702 | Returns library name, or NULL. */ | |
703 | ||
704 | static const char * | |
705 | dladdr_to_soname (const void *addr) | |
706 | { | |
707 | Dl_info info; | |
708 | ||
709 | if (dladdr (addr, &info) != 0) | |
710 | return info.dli_fname; | |
711 | return NULL; | |
712 | } | |
713 | ||
2471d008 | 714 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
715 | Return 1 on success. |
716 | Failure could happen if libthread_db does not have symbols we expect, | |
717 | or when it refuses to work with the current inferior (e.g. due to | |
718 | version mismatch between libthread_db and libpthread). */ | |
719 | ||
720 | static int | |
d90e17a7 | 721 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
722 | { |
723 | td_err_e err; | |
724 | ||
725 | /* Initialize pointers to the dynamic library functions we will use. | |
726 | Essential functions first. */ | |
727 | ||
d90e17a7 PA |
728 | info->td_init_p = verbose_dlsym (info->handle, "td_init"); |
729 | if (info->td_init_p == NULL) | |
17a37d48 PP |
730 | return 0; |
731 | ||
d90e17a7 | 732 | err = info->td_init_p (); |
17a37d48 PP |
733 | if (err != TD_OK) |
734 | { | |
3e43a32a MS |
735 | warning (_("Cannot initialize libthread_db: %s"), |
736 | thread_db_err_str (err)); | |
17a37d48 PP |
737 | return 0; |
738 | } | |
739 | ||
d90e17a7 PA |
740 | info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new"); |
741 | if (info->td_ta_new_p == NULL) | |
17a37d48 PP |
742 | return 0; |
743 | ||
744 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 745 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
746 | |
747 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 748 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
749 | if (err != TD_OK) |
750 | { | |
02d868e8 | 751 | if (libthread_db_debug) |
17a37d48 PP |
752 | printf_unfiltered (_("td_ta_new failed: %s\n"), |
753 | thread_db_err_str (err)); | |
754 | else | |
755 | switch (err) | |
756 | { | |
757 | case TD_NOLIBTHREAD: | |
758 | #ifdef THREAD_DB_HAS_TD_VERSION | |
759 | case TD_VERSION: | |
760 | #endif | |
761 | /* The errors above are not unexpected and silently ignored: | |
762 | they just mean we haven't found correct version of | |
763 | libthread_db yet. */ | |
764 | break; | |
765 | default: | |
766 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
767 | } | |
768 | return 0; | |
769 | } | |
770 | ||
d90e17a7 PA |
771 | info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr"); |
772 | if (info->td_ta_map_id2thr_p == NULL) | |
17a37d48 PP |
773 | return 0; |
774 | ||
3e43a32a MS |
775 | info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, |
776 | "td_ta_map_lwp2thr"); | |
d90e17a7 | 777 | if (info->td_ta_map_lwp2thr_p == NULL) |
17a37d48 PP |
778 | return 0; |
779 | ||
d90e17a7 PA |
780 | info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter"); |
781 | if (info->td_ta_thr_iter_p == NULL) | |
17a37d48 PP |
782 | return 0; |
783 | ||
d90e17a7 PA |
784 | info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate"); |
785 | if (info->td_thr_validate_p == NULL) | |
17a37d48 PP |
786 | return 0; |
787 | ||
d90e17a7 PA |
788 | info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info"); |
789 | if (info->td_thr_get_info_p == NULL) | |
17a37d48 PP |
790 | return 0; |
791 | ||
792 | /* These are not essential. */ | |
d90e17a7 PA |
793 | info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr"); |
794 | info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event"); | |
21e1bee4 | 795 | info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event"); |
d90e17a7 PA |
796 | info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); |
797 | info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); | |
798 | info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); | |
17a37d48 | 799 | |
fcb44371 JK |
800 | if (thread_db_find_new_threads_silently (inferior_ptid) != 0) |
801 | { | |
802 | /* Even if libthread_db initializes, if the thread list is | |
803 | corrupted, we'd not manage to list any threads. Better reject this | |
804 | thread_db, and fall back to at least listing LWPs. */ | |
805 | return 0; | |
806 | } | |
807 | ||
17a37d48 PP |
808 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
809 | ||
02d868e8 | 810 | if (libthread_db_debug || *libthread_db_search_path) |
d90e17a7 PA |
811 | { |
812 | const char *library; | |
17a37d48 | 813 | |
d90e17a7 PA |
814 | library = dladdr_to_soname (*info->td_ta_new_p); |
815 | if (library == NULL) | |
816 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 817 | |
d90e17a7 PA |
818 | printf_unfiltered (_("Using host libthread_db library \"%s\".\n"), |
819 | library); | |
820 | } | |
17a37d48 | 821 | |
d90e17a7 PA |
822 | /* The thread library was detected. Activate the thread_db target |
823 | if this is the first process using it. */ | |
824 | if (thread_db_list->next == NULL) | |
825 | push_target (&thread_db_ops); | |
17a37d48 | 826 | |
856d6f99 PA |
827 | /* Enable event reporting, but not when debugging a core file. */ |
828 | if (target_has_execution) | |
829 | enable_thread_event_reporting (); | |
456b0e24 | 830 | |
d90e17a7 | 831 | return 1; |
17a37d48 PP |
832 | } |
833 | ||
834 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
835 | relative, or just LIBTHREAD_DB. */ | |
836 | ||
837 | static int | |
838 | try_thread_db_load (const char *library) | |
839 | { | |
840 | void *handle; | |
d90e17a7 | 841 | struct thread_db_info *info; |
17a37d48 | 842 | |
02d868e8 | 843 | if (libthread_db_debug) |
17a37d48 PP |
844 | printf_unfiltered (_("Trying host libthread_db library: %s.\n"), |
845 | library); | |
846 | handle = dlopen (library, RTLD_NOW); | |
847 | if (handle == NULL) | |
848 | { | |
02d868e8 | 849 | if (libthread_db_debug) |
17a37d48 PP |
850 | printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ()); |
851 | return 0; | |
852 | } | |
853 | ||
02d868e8 | 854 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
855 | { |
856 | void *td_init; | |
857 | ||
858 | td_init = dlsym (handle, "td_init"); | |
859 | if (td_init != NULL) | |
860 | { | |
861 | const char *const libpath = dladdr_to_soname (td_init); | |
862 | ||
863 | if (libpath != NULL) | |
864 | printf_unfiltered (_("Host %s resolved to: %s.\n"), | |
865 | library, libpath); | |
866 | } | |
867 | } | |
868 | ||
d90e17a7 PA |
869 | info = add_thread_db_info (handle); |
870 | ||
bf88dd68 JK |
871 | /* Do not save system library name, that one is always trusted. */ |
872 | if (strchr (library, '/') != NULL) | |
873 | info->filename = gdb_realpath (library); | |
874 | ||
d90e17a7 | 875 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
876 | return 1; |
877 | ||
878 | /* This library "refused" to work on current inferior. */ | |
d90e17a7 | 879 | delete_thread_db_info (GET_PID (inferior_ptid)); |
17a37d48 PP |
880 | return 0; |
881 | } | |
882 | ||
290351b8 DE |
883 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
884 | Try loading libthread_db from the same directory as OBJ. | |
885 | The result is true for success. */ | |
886 | ||
887 | static int | |
888 | try_thread_db_load_from_pdir_1 (struct objfile *obj) | |
889 | { | |
05386e9e TT |
890 | struct cleanup *cleanup; |
891 | char *path, *cp; | |
892 | int result; | |
290351b8 | 893 | |
05386e9e | 894 | if (obj->name[0] != '/') |
290351b8 DE |
895 | { |
896 | warning (_("Expected absolute pathname for libpthread in the" | |
05386e9e | 897 | " inferior, but got %s."), obj->name); |
290351b8 DE |
898 | return 0; |
899 | } | |
05386e9e TT |
900 | |
901 | path = xmalloc (strlen (obj->name) + 1 + strlen (LIBTHREAD_DB_SO) + 1); | |
902 | cleanup = make_cleanup (xfree, path); | |
903 | ||
904 | strcpy (path, obj->name); | |
905 | cp = strrchr (path, '/'); | |
906 | /* This should at minimum hit the first character. */ | |
907 | gdb_assert (cp != NULL); | |
908 | strcpy (cp + 1, LIBTHREAD_DB_SO); | |
bccbefd2 | 909 | |
4dc84fd1 JK |
910 | if (!file_is_auto_load_safe (path, _("auto-load: Loading libthread-db " |
911 | "library \"%s\" from $pdir.\n"), | |
912 | path)) | |
bccbefd2 JK |
913 | result = 0; |
914 | else | |
915 | result = try_thread_db_load (path); | |
05386e9e TT |
916 | |
917 | do_cleanups (cleanup); | |
918 | return result; | |
290351b8 DE |
919 | } |
920 | ||
98a5dd13 DE |
921 | /* Handle $pdir in libthread-db-search-path. |
922 | Look for libthread_db in the directory of libpthread. | |
923 | The result is true for success. */ | |
924 | ||
925 | static int | |
926 | try_thread_db_load_from_pdir (void) | |
927 | { | |
928 | struct objfile *obj; | |
929 | ||
bf88dd68 JK |
930 | if (!auto_load_thread_db) |
931 | return 0; | |
932 | ||
98a5dd13 DE |
933 | ALL_OBJFILES (obj) |
934 | if (libpthread_name_p (obj->name)) | |
935 | { | |
290351b8 DE |
936 | if (try_thread_db_load_from_pdir_1 (obj)) |
937 | return 1; | |
938 | ||
939 | /* We may have found the separate-debug-info version of | |
940 | libpthread, and it may live in a directory without a matching | |
941 | libthread_db. */ | |
942 | if (obj->separate_debug_objfile_backlink != NULL) | |
943 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink); | |
944 | ||
98a5dd13 DE |
945 | return 0; |
946 | } | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
951 | /* Handle $sdir in libthread-db-search-path. | |
952 | Look for libthread_db in the system dirs, or wherever a plain | |
953 | dlopen(file_without_path) will look. | |
954 | The result is true for success. */ | |
955 | ||
956 | static int | |
957 | try_thread_db_load_from_sdir (void) | |
958 | { | |
959 | return try_thread_db_load (LIBTHREAD_DB_SO); | |
960 | } | |
961 | ||
962 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
963 | The result is true for success. */ | |
964 | ||
965 | static int | |
966 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
967 | { | |
05386e9e TT |
968 | struct cleanup *cleanup; |
969 | char *path; | |
970 | int result; | |
98a5dd13 | 971 | |
bf88dd68 JK |
972 | if (!auto_load_thread_db) |
973 | return 0; | |
974 | ||
05386e9e TT |
975 | path = xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
976 | cleanup = make_cleanup (xfree, path); | |
98a5dd13 DE |
977 | |
978 | memcpy (path, dir, dir_len); | |
979 | path[dir_len] = '/'; | |
980 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
bccbefd2 | 981 | |
4dc84fd1 JK |
982 | if (!file_is_auto_load_safe (path, _("auto-load: Loading libthread-db " |
983 | "library \"%s\" from explicit " | |
984 | "directory.\n"), | |
985 | path)) | |
bccbefd2 JK |
986 | result = 0; |
987 | else | |
988 | result = try_thread_db_load (path); | |
05386e9e TT |
989 | |
990 | do_cleanups (cleanup); | |
991 | return result; | |
98a5dd13 DE |
992 | } |
993 | ||
17a37d48 | 994 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
995 | to work on current inferior. |
996 | The result is true for success. */ | |
17a37d48 PP |
997 | |
998 | static int | |
999 | thread_db_load_search (void) | |
1000 | { | |
17a37d48 PP |
1001 | const char *search_path = libthread_db_search_path; |
1002 | int rc = 0; | |
1003 | ||
1004 | while (*search_path) | |
1005 | { | |
1006 | const char *end = strchr (search_path, ':'); | |
98a5dd13 DE |
1007 | const char *this_dir = search_path; |
1008 | size_t this_dir_len; | |
e0881a8e | 1009 | |
17a37d48 PP |
1010 | if (end) |
1011 | { | |
98a5dd13 DE |
1012 | this_dir_len = end - search_path; |
1013 | search_path += this_dir_len + 1; | |
17a37d48 PP |
1014 | } |
1015 | else | |
1016 | { | |
98a5dd13 DE |
1017 | this_dir_len = strlen (this_dir); |
1018 | search_path += this_dir_len; | |
1019 | } | |
17a37d48 | 1020 | |
98a5dd13 DE |
1021 | if (this_dir_len == sizeof ("$pdir") - 1 |
1022 | && strncmp (this_dir, "$pdir", this_dir_len) == 0) | |
1023 | { | |
1024 | if (try_thread_db_load_from_pdir ()) | |
1025 | { | |
1026 | rc = 1; | |
1027 | break; | |
1028 | } | |
17a37d48 | 1029 | } |
98a5dd13 DE |
1030 | else if (this_dir_len == sizeof ("$sdir") - 1 |
1031 | && strncmp (this_dir, "$sdir", this_dir_len) == 0) | |
1032 | { | |
1033 | if (try_thread_db_load_from_sdir ()) | |
1034 | { | |
1035 | rc = 1; | |
1036 | break; | |
1037 | } | |
1038 | } | |
1039 | else | |
17a37d48 | 1040 | { |
98a5dd13 DE |
1041 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
1042 | { | |
1043 | rc = 1; | |
1044 | break; | |
1045 | } | |
17a37d48 PP |
1046 | } |
1047 | } | |
98a5dd13 DE |
1048 | |
1049 | if (libthread_db_debug) | |
1050 | printf_unfiltered (_("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1051 | return rc; |
1052 | } | |
1053 | ||
98a5dd13 DE |
1054 | /* Return non-zero if the inferior has a libpthread. */ |
1055 | ||
1056 | static int | |
1057 | has_libpthread (void) | |
1058 | { | |
1059 | struct objfile *obj; | |
1060 | ||
1061 | ALL_OBJFILES (obj) | |
1062 | if (libpthread_name_p (obj->name)) | |
1063 | return 1; | |
1064 | ||
1065 | return 0; | |
1066 | } | |
1067 | ||
17a37d48 | 1068 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1069 | Return 1 on success. */ |
17a37d48 PP |
1070 | |
1071 | static int | |
1072 | thread_db_load (void) | |
1073 | { | |
d90e17a7 | 1074 | struct thread_db_info *info; |
17a37d48 | 1075 | |
d90e17a7 PA |
1076 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
1077 | ||
1078 | if (info != NULL) | |
17a37d48 PP |
1079 | return 1; |
1080 | ||
856d6f99 PA |
1081 | /* Don't attempt to use thread_db on executables not running |
1082 | yet. */ | |
1083 | if (!target_has_registers) | |
17a37d48 PP |
1084 | return 0; |
1085 | ||
1086 | /* Don't attempt to use thread_db for remote targets. */ | |
856d6f99 | 1087 | if (!(target_can_run (¤t_target) || core_bfd)) |
17a37d48 PP |
1088 | return 0; |
1089 | ||
1090 | if (thread_db_load_search ()) | |
1091 | return 1; | |
1092 | ||
98a5dd13 DE |
1093 | /* We couldn't find a libthread_db. |
1094 | If the inferior has a libpthread warn the user. */ | |
1095 | if (has_libpthread ()) | |
1096 | { | |
1097 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1098 | " library, thread debugging will not be available.")); | |
1099 | return 0; | |
17a37d48 | 1100 | } |
98a5dd13 | 1101 | |
17a37d48 PP |
1102 | /* Either this executable isn't using libpthread at all, or it is |
1103 | statically linked. Since we can't easily distinguish these two cases, | |
1104 | no warning is issued. */ | |
1105 | return 0; | |
1106 | } | |
1107 | ||
fb0e1ba7 | 1108 | static void |
12b6a110 | 1109 | disable_thread_event_reporting (struct thread_db_info *info) |
fb0e1ba7 | 1110 | { |
21e1bee4 | 1111 | if (info->td_ta_clear_event_p != NULL) |
12b6a110 PP |
1112 | { |
1113 | td_thr_events_t events; | |
fb0e1ba7 | 1114 | |
12b6a110 PP |
1115 | /* Set the process wide mask saying we aren't interested in any |
1116 | events anymore. */ | |
21e1bee4 PP |
1117 | td_event_fillset (&events); |
1118 | info->td_ta_clear_event_p (info->thread_agent, &events); | |
12b6a110 | 1119 | } |
fb0e1ba7 | 1120 | |
d90e17a7 PA |
1121 | info->td_create_bp_addr = 0; |
1122 | info->td_death_bp_addr = 0; | |
fb0e1ba7 MK |
1123 | } |
1124 | ||
1125 | static void | |
1126 | check_thread_signals (void) | |
1127 | { | |
21bf60fe | 1128 | if (!thread_signals) |
fb0e1ba7 MK |
1129 | { |
1130 | sigset_t mask; | |
1131 | int i; | |
1132 | ||
669211f5 | 1133 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1134 | sigemptyset (&thread_stop_set); |
1135 | sigemptyset (&thread_print_set); | |
1136 | ||
b9569773 | 1137 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1138 | { |
1139 | if (sigismember (&mask, i)) | |
1140 | { | |
2ea28649 | 1141 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 1142 | sigaddset (&thread_stop_set, i); |
2ea28649 | 1143 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
1144 | sigaddset (&thread_print_set, i); |
1145 | thread_signals = 1; | |
1146 | } | |
1147 | } | |
1148 | } | |
fb0e1ba7 MK |
1149 | } |
1150 | ||
0ec9a092 DJ |
1151 | /* Check whether thread_db is usable. This function is called when |
1152 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1153 | and when new shared libraries are loaded into a running process. */ | |
1154 | ||
1155 | void | |
1156 | check_for_thread_db (void) | |
fb0e1ba7 | 1157 | { |
b5057acd | 1158 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1159 | if (!thread_db_load ()) |
b5057acd | 1160 | return; |
0ec9a092 DJ |
1161 | } |
1162 | ||
0838fb57 DE |
1163 | /* This function is called via the new_objfile observer. */ |
1164 | ||
0ec9a092 DJ |
1165 | static void |
1166 | thread_db_new_objfile (struct objfile *objfile) | |
1167 | { | |
d90e17a7 PA |
1168 | /* This observer must always be called with inferior_ptid set |
1169 | correctly. */ | |
1170 | ||
0838fb57 | 1171 | if (objfile != NULL |
fcb44371 | 1172 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 1173 | loaded (and notified without successful thread_db initialization) |
fcb44371 JK |
1174 | the time observer_notify_new_objfile is called for the library itself. |
1175 | Static executables have their separate debug info loaded already | |
1176 | before the inferior has started. */ | |
1177 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1178 | /* Only check for thread_db if we loaded libpthread, |
1179 | or if this is the main symbol file. | |
1180 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1181 | a statically linked executable AND the symbol file is specified AFTER | |
1182 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1183 | For dynamically linked executables, libpthread can be near the end | |
1184 | of the list of shared libraries to load, and in an app of several | |
1185 | thousand shared libraries, this can otherwise be painful. */ | |
1186 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
1187 | || libpthread_name_p (objfile->name))) | |
0ec9a092 | 1188 | check_for_thread_db (); |
fb0e1ba7 MK |
1189 | } |
1190 | ||
0838fb57 DE |
1191 | /* This function is called via the inferior_created observer. |
1192 | This handles the case of debugging statically linked executables. */ | |
1193 | ||
1194 | static void | |
1195 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1196 | { | |
1197 | check_for_thread_db (); | |
1198 | } | |
1199 | ||
a2f23071 DJ |
1200 | /* Attach to a new thread. This function is called when we receive a |
1201 | TD_CREATE event or when we iterate over all threads and find one | |
02c6c942 | 1202 | that wasn't already in our list. Returns true on success. */ |
a2f23071 | 1203 | |
02c6c942 | 1204 | static int |
39f77062 | 1205 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 1206 | const td_thrinfo_t *ti_p) |
fb0e1ba7 | 1207 | { |
17faa917 | 1208 | struct private_thread_info *private; |
2a2ef594 | 1209 | struct thread_info *tp; |
fb0e1ba7 | 1210 | td_err_e err; |
d90e17a7 | 1211 | struct thread_db_info *info; |
fb0e1ba7 | 1212 | |
a2f23071 DJ |
1213 | /* If we're being called after a TD_CREATE event, we may already |
1214 | know about this thread. There are two ways this can happen. We | |
1215 | may have iterated over all threads between the thread creation | |
1216 | and the TD_CREATE event, for instance when the user has issued | |
1217 | the `info threads' command before the SIGTRAP for hitting the | |
1218 | thread creation breakpoint was reported. Alternatively, the | |
1219 | thread may have exited and a new one been created with the same | |
1220 | thread ID. In the first case we don't need to do anything; in | |
1221 | the second case we should discard information about the dead | |
1222 | thread and attach to the new one. */ | |
2a2ef594 PA |
1223 | tp = find_thread_ptid (ptid); |
1224 | if (tp != NULL) | |
a2f23071 | 1225 | { |
17faa917 DJ |
1226 | /* If tp->private is NULL, then GDB is already attached to this |
1227 | thread, but we do not know anything about it. We can learn | |
1228 | about it here. This can only happen if we have some other | |
1229 | way besides libthread_db to notice new threads (i.e. | |
1230 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread | |
1231 | exit, so this can not be a stale thread recreated with the | |
1232 | same ID. */ | |
1233 | if (tp->private != NULL) | |
1234 | { | |
1235 | if (!tp->private->dying) | |
02c6c942 | 1236 | return 0; |
a2f23071 | 1237 | |
17faa917 DJ |
1238 | delete_thread (ptid); |
1239 | tp = NULL; | |
1240 | } | |
a2f23071 DJ |
1241 | } |
1242 | ||
856d6f99 PA |
1243 | if (target_has_execution) |
1244 | check_thread_signals (); | |
fb0e1ba7 | 1245 | |
9ee57c33 | 1246 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
856d6f99 | 1247 | if (target_has_execution |
84636d28 PA |
1248 | && tp == NULL) |
1249 | { | |
1250 | int res; | |
1251 | ||
1252 | res = lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid))); | |
1253 | if (res < 0) | |
1254 | { | |
1255 | /* Error, stop iterating. */ | |
1256 | return 0; | |
1257 | } | |
1258 | else if (res > 0) | |
1259 | { | |
1260 | /* Pretend this thread doesn't exist yet, and keep | |
1261 | iterating. */ | |
1262 | return 1; | |
1263 | } | |
1264 | ||
1265 | /* Otherwise, we sucessfully attached to the thread. */ | |
1266 | } | |
9ee57c33 | 1267 | |
17faa917 DJ |
1268 | /* Construct the thread's private data. */ |
1269 | private = xmalloc (sizeof (struct private_thread_info)); | |
1270 | memset (private, 0, sizeof (struct private_thread_info)); | |
1271 | ||
1272 | /* A thread ID of zero may mean the thread library has not initialized | |
1273 | yet. But we shouldn't even get here if that's the case. FIXME: | |
1274 | if we change GDB to always have at least one thread in the thread | |
1275 | list this will have to go somewhere else; maybe private == NULL | |
1276 | until the thread_db target claims it. */ | |
1277 | gdb_assert (ti_p->ti_tid != 0); | |
1278 | private->th = *th_p; | |
1279 | private->tid = ti_p->ti_tid; | |
64776a0b PA |
1280 | if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) |
1281 | private->dying = 1; | |
17faa917 | 1282 | |
fb0e1ba7 | 1283 | /* Add the thread to GDB's thread list. */ |
17faa917 | 1284 | if (tp == NULL) |
2e456570 | 1285 | add_thread_with_info (ptid, private); |
17faa917 DJ |
1286 | else |
1287 | tp->private = private; | |
5365276c | 1288 | |
d90e17a7 PA |
1289 | info = get_thread_db_info (GET_PID (ptid)); |
1290 | ||
856d6f99 PA |
1291 | /* Enable thread event reporting for this thread, except when |
1292 | debugging a core file. */ | |
1293 | if (target_has_execution) | |
1294 | { | |
1295 | err = info->td_thr_event_enable_p (th_p, 1); | |
1296 | if (err != TD_OK) | |
1297 | error (_("Cannot enable thread event reporting for %s: %s"), | |
1298 | target_pid_to_str (ptid), thread_db_err_str (err)); | |
1299 | } | |
1300 | ||
02c6c942 | 1301 | return 1; |
fb0e1ba7 MK |
1302 | } |
1303 | ||
1304 | static void | |
17faa917 | 1305 | detach_thread (ptid_t ptid) |
fb0e1ba7 | 1306 | { |
a2f23071 DJ |
1307 | struct thread_info *thread_info; |
1308 | ||
a2f23071 DJ |
1309 | /* Don't delete the thread now, because it still reports as active |
1310 | until it has executed a few instructions after the event | |
1311 | breakpoint - if we deleted it now, "info threads" would cause us | |
1312 | to re-attach to it. Just mark it as having had a TD_DEATH | |
1313 | event. This means that we won't delete it from our thread list | |
1314 | until we notice that it's dead (via prune_threads), or until | |
17faa917 DJ |
1315 | something re-uses its thread ID. We'll report the thread exit |
1316 | when the underlying LWP dies. */ | |
e09875d4 | 1317 | thread_info = find_thread_ptid (ptid); |
17faa917 | 1318 | gdb_assert (thread_info != NULL && thread_info->private != NULL); |
a2f23071 | 1319 | thread_info->private->dying = 1; |
fb0e1ba7 MK |
1320 | } |
1321 | ||
1322 | static void | |
136d6dae | 1323 | thread_db_detach (struct target_ops *ops, char *args, int from_tty) |
fb0e1ba7 | 1324 | { |
117de6a9 | 1325 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1326 | struct thread_db_info *info; |
117de6a9 | 1327 | |
d90e17a7 | 1328 | info = get_thread_db_info (GET_PID (inferior_ptid)); |
c194fbe1 | 1329 | |
d90e17a7 PA |
1330 | if (info) |
1331 | { | |
856d6f99 PA |
1332 | if (target_has_execution) |
1333 | { | |
1334 | disable_thread_event_reporting (info); | |
1335 | ||
1336 | /* Delete the old thread event breakpoints. Note that | |
1337 | unlike when mourning, we can remove them here because | |
1338 | there's still a live inferior to poke at. In any case, | |
1339 | GDB will not try to insert anything in the inferior when | |
1340 | removing a breakpoint. */ | |
1341 | remove_thread_event_breakpoints (); | |
1342 | } | |
d90e17a7 PA |
1343 | |
1344 | delete_thread_db_info (GET_PID (inferior_ptid)); | |
1345 | } | |
4105de34 | 1346 | |
7a7d3353 | 1347 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1348 | |
1349 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1350 | ||
1351 | /* If there are no more processes using libpthread, detach the | |
1352 | thread_db target ops. */ | |
1353 | if (!thread_db_list) | |
1354 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1355 | } |
1356 | ||
fb0e1ba7 MK |
1357 | /* Check if PID is currently stopped at the location of a thread event |
1358 | breakpoint location. If it is, read the event message and act upon | |
1359 | the event. */ | |
1360 | ||
1361 | static void | |
39f77062 | 1362 | check_event (ptid_t ptid) |
fb0e1ba7 | 1363 | { |
515630c5 UW |
1364 | struct regcache *regcache = get_thread_regcache (ptid); |
1365 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
fb0e1ba7 MK |
1366 | td_event_msg_t msg; |
1367 | td_thrinfo_t ti; | |
1368 | td_err_e err; | |
1369 | CORE_ADDR stop_pc; | |
4d9850d3 | 1370 | int loop = 0; |
d90e17a7 PA |
1371 | struct thread_db_info *info; |
1372 | ||
1373 | info = get_thread_db_info (GET_PID (ptid)); | |
fb0e1ba7 MK |
1374 | |
1375 | /* Bail out early if we're not at a thread event breakpoint. */ | |
515630c5 UW |
1376 | stop_pc = regcache_read_pc (regcache) |
1377 | - gdbarch_decr_pc_after_break (gdbarch); | |
d90e17a7 PA |
1378 | if (stop_pc != info->td_create_bp_addr |
1379 | && stop_pc != info->td_death_bp_addr) | |
fb0e1ba7 MK |
1380 | return; |
1381 | ||
4c28f408 | 1382 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1383 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
1384 | |
1385 | /* If we have only looked at the first thread before libpthread was | |
1386 | initialized, we may not know its thread ID yet. Make sure we do | |
1387 | before we add another thread to the list. */ | |
d90e17a7 PA |
1388 | if (!have_threads (ptid)) |
1389 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 1390 | |
4d9850d3 JJ |
1391 | /* If we are at a create breakpoint, we do not know what new lwp |
1392 | was created and cannot specifically locate the event message for it. | |
1393 | We have to call td_ta_event_getmsg() to get | |
1394 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 1395 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 1396 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
1397 | This guarantees we will process the correct message before continuing |
1398 | from the breakpoint. | |
4d9850d3 JJ |
1399 | |
1400 | Currently, death events are not enabled. If they are enabled, | |
1401 | the death event can use the td_thr_event_getmsg() interface to | |
1402 | get the message specifically for that lwp and avoid looping | |
1403 | below. */ | |
1404 | ||
1405 | loop = 1; | |
1406 | ||
1407 | do | |
fb0e1ba7 | 1408 | { |
d90e17a7 | 1409 | err = info->td_ta_event_getmsg_p (info->thread_agent, &msg); |
4d9850d3 JJ |
1410 | if (err != TD_OK) |
1411 | { | |
1412 | if (err == TD_NOMSG) | |
1413 | return; | |
fb0e1ba7 | 1414 | |
8a3fe4f8 | 1415 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
1416 | thread_db_err_str (err)); |
1417 | } | |
fb0e1ba7 | 1418 | |
d90e17a7 | 1419 | err = info->td_thr_get_info_p (msg.th_p, &ti); |
4d9850d3 | 1420 | if (err != TD_OK) |
8a3fe4f8 | 1421 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 1422 | |
17faa917 | 1423 | ptid = ptid_build (GET_PID (ptid), ti.ti_lid, 0); |
fb0e1ba7 | 1424 | |
4d9850d3 JJ |
1425 | switch (msg.event) |
1426 | { | |
1427 | case TD_CREATE: | |
a2f23071 DJ |
1428 | /* Call attach_thread whether or not we already know about a |
1429 | thread with this thread ID. */ | |
93815fbf | 1430 | attach_thread (ptid, msg.th_p, &ti); |
fb0e1ba7 | 1431 | |
4d9850d3 | 1432 | break; |
fb0e1ba7 | 1433 | |
4d9850d3 | 1434 | case TD_DEATH: |
fb0e1ba7 | 1435 | |
4d9850d3 | 1436 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 1437 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 1438 | |
17faa917 | 1439 | detach_thread (ptid); |
fb0e1ba7 | 1440 | |
4d9850d3 | 1441 | break; |
fb0e1ba7 | 1442 | |
4d9850d3 | 1443 | default: |
8a3fe4f8 | 1444 | error (_("Spurious thread event.")); |
4d9850d3 | 1445 | } |
fb0e1ba7 | 1446 | } |
4d9850d3 | 1447 | while (loop); |
fb0e1ba7 MK |
1448 | } |
1449 | ||
39f77062 | 1450 | static ptid_t |
117de6a9 | 1451 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1452 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1453 | int options) | |
fb0e1ba7 | 1454 | { |
d90e17a7 | 1455 | struct thread_db_info *info; |
117de6a9 PA |
1456 | struct target_ops *beneath = find_target_beneath (ops); |
1457 | ||
47608cb1 | 1458 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1459 | |
b84876c2 PA |
1460 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1461 | return ptid; | |
1462 | ||
1111f4aa | 1463 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1464 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1465 | return ptid; | |
fb0e1ba7 | 1466 | |
d90e17a7 PA |
1467 | info = get_thread_db_info (GET_PID (ptid)); |
1468 | ||
1469 | /* If this process isn't using thread_db, we're done. */ | |
1470 | if (info == NULL) | |
1471 | return ptid; | |
1472 | ||
3f64f7b1 DJ |
1473 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1474 | { | |
d90e17a7 PA |
1475 | /* New image, it may or may not end up using thread_db. Assume |
1476 | not unless we find otherwise. */ | |
1477 | delete_thread_db_info (GET_PID (ptid)); | |
1478 | if (!thread_db_list) | |
1479 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1480 | |
6c95b8df PA |
1481 | /* Thread event breakpoints are deleted by |
1482 | update_breakpoints_after_exec. */ | |
1483 | ||
49fd4a42 | 1484 | return ptid; |
3f64f7b1 DJ |
1485 | } |
1486 | ||
4105de34 DJ |
1487 | /* If we do not know about the main thread yet, this would be a good time to |
1488 | find it. */ | |
d90e17a7 PA |
1489 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid)) |
1490 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1491 | |
fb0e1ba7 | 1492 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
a493e3e2 | 1493 | && ourstatus->value.sig == GDB_SIGNAL_TRAP) |
fb0e1ba7 | 1494 | /* Check for a thread event. */ |
39f77062 | 1495 | check_event (ptid); |
fb0e1ba7 | 1496 | |
d90e17a7 | 1497 | if (have_threads (ptid)) |
4105de34 | 1498 | { |
64776a0b PA |
1499 | /* Fill in the thread's user-level thread id. */ |
1500 | thread_from_lwp (ptid); | |
4105de34 | 1501 | } |
fb0e1ba7 | 1502 | |
b9b5d7ea | 1503 | return ptid; |
fb0e1ba7 MK |
1504 | } |
1505 | ||
fb0e1ba7 | 1506 | static void |
136d6dae | 1507 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1508 | { |
117de6a9 PA |
1509 | struct target_ops *target_beneath = find_target_beneath (ops); |
1510 | ||
d90e17a7 | 1511 | delete_thread_db_info (GET_PID (inferior_ptid)); |
fb0e1ba7 | 1512 | |
d90e17a7 PA |
1513 | target_beneath->to_mourn_inferior (target_beneath); |
1514 | ||
6c95b8df PA |
1515 | /* Delete the old thread event breakpoints. Do this after mourning |
1516 | the inferior, so that we don't try to uninsert them. */ | |
1517 | remove_thread_event_breakpoints (); | |
1518 | ||
b26a6851 | 1519 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1520 | if (!thread_db_list) |
1521 | unpush_target (ops); | |
fb0e1ba7 MK |
1522 | } |
1523 | ||
02c6c942 PP |
1524 | struct callback_data |
1525 | { | |
1526 | struct thread_db_info *info; | |
1527 | int new_threads; | |
1528 | }; | |
1529 | ||
fb0e1ba7 MK |
1530 | static int |
1531 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1532 | { | |
1533 | td_thrinfo_t ti; | |
1534 | td_err_e err; | |
39f77062 | 1535 | ptid_t ptid; |
403fe197 | 1536 | struct thread_info *tp; |
02c6c942 PP |
1537 | struct callback_data *cb_data = data; |
1538 | struct thread_db_info *info = cb_data->info; | |
fb0e1ba7 | 1539 | |
d90e17a7 | 1540 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1541 | if (err != TD_OK) |
8a3fe4f8 | 1542 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1543 | thread_db_err_str (err)); |
fb0e1ba7 | 1544 | |
254f582e | 1545 | if (ti.ti_tid == 0) |
4105de34 DJ |
1546 | { |
1547 | /* A thread ID of zero means that this is the main thread, but | |
1548 | glibc has not yet initialized thread-local storage and the | |
1549 | pthread library. We do not know what the thread's TID will | |
1550 | be yet. Just enable event reporting and otherwise ignore | |
1551 | it. */ | |
1552 | ||
4d062f1a PA |
1553 | /* In that case, we're not stopped in a fork syscall and don't |
1554 | need this glibc bug workaround. */ | |
1555 | info->need_stale_parent_threads_check = 0; | |
1556 | ||
254f582e JK |
1557 | if (target_has_execution) |
1558 | { | |
1559 | err = info->td_thr_event_enable_p (th_p, 1); | |
1560 | if (err != TD_OK) | |
1561 | error (_("Cannot enable thread event reporting for LWP %d: %s"), | |
1562 | (int) ti.ti_lid, thread_db_err_str (err)); | |
1563 | } | |
4105de34 DJ |
1564 | |
1565 | return 0; | |
1566 | } | |
1567 | ||
4d062f1a PA |
1568 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1569 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1570 | avoid doing the work if we know we don't have to. */ | |
1571 | if (info->need_stale_parent_threads_check) | |
1572 | { | |
1573 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1574 | |
4d062f1a PA |
1575 | if (tgid != -1 && tgid != info->pid) |
1576 | return 0; | |
1577 | } | |
1578 | ||
1579 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1580 | tp = find_thread_ptid (ptid); |
403fe197 | 1581 | if (tp == NULL || tp->private == NULL) |
02c6c942 PP |
1582 | { |
1583 | if (attach_thread (ptid, th_p, &ti)) | |
1584 | cb_data->new_threads += 1; | |
1585 | else | |
1586 | /* Problem attaching this thread; perhaps it exited before we | |
1587 | could attach it? | |
1588 | This could mean that the thread list inside glibc itself is in | |
1589 | inconsistent state, and libthread_db could go on looping forever | |
1590 | (observed with glibc-2.3.6). To prevent that, terminate | |
1591 | iteration: thread_db_find_new_threads_2 will retry. */ | |
1592 | return 1; | |
1593 | } | |
fb0e1ba7 MK |
1594 | |
1595 | return 0; | |
1596 | } | |
1597 | ||
02c6c942 PP |
1598 | /* Helper for thread_db_find_new_threads_2. |
1599 | Returns number of new threads found. */ | |
1600 | ||
1601 | static int | |
1602 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1603 | td_err_e *errp) |
02c6c942 PP |
1604 | { |
1605 | volatile struct gdb_exception except; | |
1606 | struct callback_data data; | |
fb169834 | 1607 | td_err_e err = TD_ERR; |
02c6c942 PP |
1608 | |
1609 | data.info = info; | |
1610 | data.new_threads = 0; | |
1611 | ||
1612 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
1613 | { | |
1614 | /* Iterate over all user-space threads to discover new threads. */ | |
1615 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1616 | find_new_threads_callback, | |
1617 | &data, | |
1618 | TD_THR_ANY_STATE, | |
1619 | TD_THR_LOWEST_PRIORITY, | |
1620 | TD_SIGNO_MASK, | |
1621 | TD_THR_ANY_USER_FLAGS); | |
1622 | } | |
1623 | ||
02d868e8 | 1624 | if (libthread_db_debug) |
02c6c942 PP |
1625 | { |
1626 | if (except.reason < 0) | |
1627 | exception_fprintf (gdb_stderr, except, | |
1628 | "Warning: find_new_threads_once: "); | |
1629 | ||
1630 | printf_filtered (_("Found %d new threads in iteration %d.\n"), | |
1631 | data.new_threads, iteration); | |
1632 | } | |
1633 | ||
1634 | if (errp != NULL) | |
1635 | *errp = err; | |
1636 | ||
1637 | return data.new_threads; | |
1638 | } | |
1639 | ||
4c28f408 | 1640 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1641 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1642 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1643 | |
fb0e1ba7 | 1644 | static void |
02c6c942 | 1645 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 | 1646 | { |
fcb44371 | 1647 | td_err_e err = TD_OK; |
d90e17a7 PA |
1648 | struct thread_db_info *info; |
1649 | int pid = ptid_get_pid (ptid); | |
02c6c942 | 1650 | int i, loop; |
4c28f408 | 1651 | |
d90e17a7 PA |
1652 | info = get_thread_db_info (GET_PID (ptid)); |
1653 | ||
4c28f408 | 1654 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1655 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1656 | |
1657 | if (until_no_new) | |
1658 | { | |
1659 | /* Require 4 successive iterations which do not find any new threads. | |
1660 | The 4 is a heuristic: there is an inherent race here, and I have | |
1661 | seen that 2 iterations in a row are not always sufficient to | |
1662 | "capture" all threads. */ | |
fcb44371 JK |
1663 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1664 | if (find_new_threads_once (info, i, &err) != 0) | |
1665 | { | |
1666 | /* Found some new threads. Restart the loop from beginning. */ | |
1667 | loop = -1; | |
1668 | } | |
02c6c942 PP |
1669 | } |
1670 | else | |
fcb44371 JK |
1671 | find_new_threads_once (info, 0, &err); |
1672 | ||
1673 | if (err != TD_OK) | |
1674 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1675 | } |
1676 | ||
02c6c942 PP |
1677 | static void |
1678 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1679 | { | |
1680 | thread_db_find_new_threads_2 (ptid, 0); | |
1681 | } | |
1682 | ||
dc146f7c VP |
1683 | static int |
1684 | update_thread_core (struct lwp_info *info, void *closure) | |
1685 | { | |
2e794194 | 1686 | info->core = linux_common_core_of_thread (info->ptid); |
dc146f7c VP |
1687 | return 0; |
1688 | } | |
02c6c942 | 1689 | |
28439f5e PA |
1690 | static void |
1691 | thread_db_find_new_threads (struct target_ops *ops) | |
1692 | { | |
d90e17a7 | 1693 | struct thread_db_info *info; |
c65b3e0d | 1694 | struct inferior *inf; |
d90e17a7 | 1695 | |
c65b3e0d PA |
1696 | ALL_INFERIORS (inf) |
1697 | { | |
1698 | struct thread_info *thread; | |
d90e17a7 | 1699 | |
c65b3e0d PA |
1700 | if (inf->pid == 0) |
1701 | continue; | |
d90e17a7 | 1702 | |
c65b3e0d PA |
1703 | info = get_thread_db_info (inf->pid); |
1704 | if (info == NULL) | |
1705 | continue; | |
1706 | ||
1707 | thread = any_live_thread_of_process (inf->pid); | |
1708 | if (thread == NULL || thread->executing) | |
1709 | continue; | |
1710 | ||
1711 | thread_db_find_new_threads_1 (thread->ptid); | |
1712 | } | |
dc146f7c | 1713 | |
856d6f99 PA |
1714 | if (target_has_execution) |
1715 | iterate_over_lwps (minus_one_ptid /* iterate over all */, | |
1716 | update_thread_core, NULL); | |
28439f5e PA |
1717 | } |
1718 | ||
fb0e1ba7 | 1719 | static char * |
117de6a9 | 1720 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1721 | { |
e09875d4 | 1722 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1723 | struct target_ops *beneath; |
17faa917 DJ |
1724 | |
1725 | if (thread_info != NULL && thread_info->private != NULL) | |
fb0e1ba7 MK |
1726 | { |
1727 | static char buf[64]; | |
17faa917 | 1728 | thread_t tid; |
fb0e1ba7 | 1729 | |
17faa917 | 1730 | tid = thread_info->private->tid; |
17faa917 DJ |
1731 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
1732 | tid, GET_LWP (ptid)); | |
fb0e1ba7 MK |
1733 | |
1734 | return buf; | |
1735 | } | |
1736 | ||
117de6a9 PA |
1737 | beneath = find_target_beneath (ops); |
1738 | if (beneath->to_pid_to_str (beneath, ptid)) | |
1739 | return beneath->to_pid_to_str (beneath, ptid); | |
fb0e1ba7 | 1740 | |
39f77062 | 1741 | return normal_pid_to_str (ptid); |
fb0e1ba7 MK |
1742 | } |
1743 | ||
28b17333 DJ |
1744 | /* Return a string describing the state of the thread specified by |
1745 | INFO. */ | |
1746 | ||
1747 | static char * | |
1748 | thread_db_extra_thread_info (struct thread_info *info) | |
1749 | { | |
17faa917 DJ |
1750 | if (info->private == NULL) |
1751 | return NULL; | |
1752 | ||
28b17333 DJ |
1753 | if (info->private->dying) |
1754 | return "Exiting"; | |
1755 | ||
1756 | return NULL; | |
1757 | } | |
1758 | ||
b2756930 KB |
1759 | /* Get the address of the thread local variable in load module LM which |
1760 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1761 | |
1762 | static CORE_ADDR | |
117de6a9 PA |
1763 | thread_db_get_thread_local_address (struct target_ops *ops, |
1764 | ptid_t ptid, | |
b2756930 | 1765 | CORE_ADDR lm, |
b4acd559 | 1766 | CORE_ADDR offset) |
3f47be5c | 1767 | { |
17faa917 | 1768 | struct thread_info *thread_info; |
117de6a9 | 1769 | struct target_ops *beneath; |
17faa917 | 1770 | |
4105de34 | 1771 | /* If we have not discovered any threads yet, check now. */ |
d90e17a7 PA |
1772 | if (!have_threads (ptid)) |
1773 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1774 | |
17faa917 | 1775 | /* Find the matching thread. */ |
e09875d4 | 1776 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1777 | |
17faa917 | 1778 | if (thread_info != NULL && thread_info->private != NULL) |
3f47be5c | 1779 | { |
3f47be5c | 1780 | td_err_e err; |
00f515da | 1781 | psaddr_t address; |
d90e17a7 PA |
1782 | struct thread_db_info *info; |
1783 | ||
1784 | info = get_thread_db_info (GET_PID (ptid)); | |
3f47be5c EZ |
1785 | |
1786 | /* glibc doesn't provide the needed interface. */ | |
d90e17a7 | 1787 | if (!info->td_thr_tls_get_addr_p) |
109c3e39 AC |
1788 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
1789 | _("No TLS library support")); | |
3f47be5c | 1790 | |
b2756930 KB |
1791 | /* Caller should have verified that lm != 0. */ |
1792 | gdb_assert (lm != 0); | |
3f47be5c | 1793 | |
3f47be5c | 1794 | /* Finally, get the address of the variable. */ |
00f515da DE |
1795 | /* Note the cast through uintptr_t: this interface only works if |
1796 | a target address fits in a psaddr_t, which is a host pointer. | |
1797 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
d90e17a7 | 1798 | err = info->td_thr_tls_get_addr_p (&thread_info->private->th, |
00f515da | 1799 | (psaddr_t)(uintptr_t) lm, |
d90e17a7 | 1800 | offset, &address); |
3f47be5c EZ |
1801 | |
1802 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1803 | /* The memory hasn't been allocated, yet. */ | |
1804 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1805 | /* Now, if libthread_db provided the initialization image's |
1806 | address, we *could* try to build a non-lvalue value from | |
1807 | the initialization image. */ | |
109c3e39 AC |
1808 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1809 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1810 | #endif |
1811 | ||
1812 | /* Something else went wrong. */ | |
1813 | if (err != TD_OK) | |
109c3e39 AC |
1814 | throw_error (TLS_GENERIC_ERROR, |
1815 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1816 | |
1817 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1818 | /* Do proper sign extension for the target. */ |
1819 | gdb_assert (exec_bfd); | |
1820 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1821 | ? (CORE_ADDR) (intptr_t) address | |
1822 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1823 | } |
1824 | ||
117de6a9 PA |
1825 | beneath = find_target_beneath (ops); |
1826 | if (beneath->to_get_thread_local_address) | |
1827 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); | |
93ad78a7 | 1828 | else |
109c3e39 AC |
1829 | throw_error (TLS_GENERIC_ERROR, |
1830 | _("TLS not supported on this target")); | |
3f47be5c EZ |
1831 | } |
1832 | ||
0ef643c8 JB |
1833 | /* Callback routine used to find a thread based on the TID part of |
1834 | its PTID. */ | |
1835 | ||
1836 | static int | |
1837 | thread_db_find_thread_from_tid (struct thread_info *thread, void *data) | |
1838 | { | |
1839 | long *tid = (long *) data; | |
1840 | ||
1841 | if (thread->private->tid == *tid) | |
1842 | return 1; | |
1843 | ||
1844 | return 0; | |
1845 | } | |
1846 | ||
1847 | /* Implement the to_get_ada_task_ptid target method for this target. */ | |
1848 | ||
1849 | static ptid_t | |
1850 | thread_db_get_ada_task_ptid (long lwp, long thread) | |
1851 | { | |
1852 | struct thread_info *thread_info; | |
1853 | ||
d90e17a7 | 1854 | thread_db_find_new_threads_1 (inferior_ptid); |
0ef643c8 JB |
1855 | thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread); |
1856 | ||
1857 | gdb_assert (thread_info != NULL); | |
1858 | ||
1859 | return (thread_info->ptid); | |
1860 | } | |
1861 | ||
4d062f1a PA |
1862 | static void |
1863 | thread_db_resume (struct target_ops *ops, | |
2ea28649 | 1864 | ptid_t ptid, int step, enum gdb_signal signo) |
4d062f1a PA |
1865 | { |
1866 | struct target_ops *beneath = find_target_beneath (ops); | |
1867 | struct thread_db_info *info; | |
1868 | ||
1869 | if (ptid_equal (ptid, minus_one_ptid)) | |
1870 | info = get_thread_db_info (GET_PID (inferior_ptid)); | |
1871 | else | |
1872 | info = get_thread_db_info (GET_PID (ptid)); | |
1873 | ||
1874 | /* This workaround is only needed for child fork lwps stopped in a | |
1875 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1876 | workaround can be disabled. */ | |
1877 | if (info) | |
1878 | info->need_stale_parent_threads_check = 0; | |
1879 | ||
1880 | beneath->to_resume (beneath, ptid, step, signo); | |
1881 | } | |
1882 | ||
bf88dd68 JK |
1883 | /* qsort helper function for info_auto_load_libthread_db, sort the |
1884 | thread_db_info pointers primarily by their FILENAME and secondarily by their | |
1885 | PID, both in ascending order. */ | |
1886 | ||
1887 | static int | |
1888 | info_auto_load_libthread_db_compare (const void *ap, const void *bp) | |
1889 | { | |
1890 | struct thread_db_info *a = *(struct thread_db_info **) ap; | |
1891 | struct thread_db_info *b = *(struct thread_db_info **) bp; | |
1892 | int retval; | |
1893 | ||
1894 | retval = strcmp (a->filename, b->filename); | |
1895 | if (retval) | |
1896 | return retval; | |
1897 | ||
1898 | return (a->pid > b->pid) - (a->pid - b->pid); | |
1899 | } | |
1900 | ||
1901 | /* Implement 'info auto-load libthread-db'. */ | |
1902 | ||
1903 | static void | |
1904 | info_auto_load_libthread_db (char *args, int from_tty) | |
1905 | { | |
1906 | struct ui_out *uiout = current_uiout; | |
1907 | const char *cs = args ? args : ""; | |
1908 | struct thread_db_info *info, **array; | |
1909 | unsigned info_count, unique_filenames; | |
1910 | size_t max_filename_len, max_pids_len, pids_len; | |
1911 | struct cleanup *back_to; | |
1912 | char *pids; | |
1913 | int i; | |
1914 | ||
1915 | while (isspace (*cs)) | |
1916 | cs++; | |
1917 | if (*cs) | |
1918 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1919 | ||
1920 | info_count = 0; | |
1921 | for (info = thread_db_list; info; info = info->next) | |
1922 | if (info->filename != NULL) | |
1923 | info_count++; | |
1924 | ||
1925 | array = xmalloc (sizeof (*array) * info_count); | |
1926 | back_to = make_cleanup (xfree, array); | |
1927 | ||
1928 | info_count = 0; | |
1929 | for (info = thread_db_list; info; info = info->next) | |
1930 | if (info->filename != NULL) | |
1931 | array[info_count++] = info; | |
1932 | ||
1933 | /* Sort ARRAY by filenames and PIDs. */ | |
1934 | ||
1935 | qsort (array, info_count, sizeof (*array), | |
1936 | info_auto_load_libthread_db_compare); | |
1937 | ||
1938 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1939 | length of PIDs list for the unique filenames (columns). */ | |
1940 | ||
1941 | unique_filenames = 0; | |
1942 | max_filename_len = 0; | |
1943 | max_pids_len = 0; | |
1944 | pids_len = 0; | |
1945 | for (i = 0; i < info_count; i++) | |
1946 | { | |
1947 | int pid = array[i]->pid; | |
1948 | size_t this_pid_len; | |
1949 | ||
1950 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1951 | this_pid_len++; | |
1952 | ||
1953 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1954 | { | |
1955 | unique_filenames++; | |
1956 | max_filename_len = max (max_filename_len, | |
1957 | strlen (array[i]->filename)); | |
1958 | ||
1959 | if (i > 0) | |
1960 | { | |
1961 | pids_len -= strlen (", "); | |
1962 | max_pids_len = max (max_pids_len, pids_len); | |
1963 | } | |
1964 | pids_len = 0; | |
1965 | } | |
1966 | pids_len += this_pid_len + strlen (", "); | |
1967 | } | |
1968 | if (i) | |
1969 | { | |
1970 | pids_len -= strlen (", "); | |
1971 | max_pids_len = max (max_pids_len, pids_len); | |
1972 | } | |
1973 | ||
1974 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1975 | its columns. */ | |
1976 | if (info_count > 0 && args == auto_load_info_scripts_pattern_nl) | |
1977 | ui_out_text (uiout, "\n"); | |
1978 | ||
1979 | make_cleanup_ui_out_table_begin_end (uiout, 2, unique_filenames, | |
1980 | "LinuxThreadDbTable"); | |
1981 | ||
1982 | ui_out_table_header (uiout, max_filename_len, ui_left, "filename", | |
1983 | "Filename"); | |
1984 | ui_out_table_header (uiout, pids_len, ui_left, "PIDs", "Pids"); | |
1985 | ui_out_table_body (uiout); | |
1986 | ||
1987 | pids = xmalloc (max_pids_len + 1); | |
1988 | make_cleanup (xfree, pids); | |
1989 | ||
1990 | /* Note I is incremented inside the cycle, not at its end. */ | |
1991 | for (i = 0; i < info_count;) | |
1992 | { | |
1993 | struct cleanup *chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); | |
1994 | char *pids_end; | |
1995 | ||
1996 | info = array[i]; | |
1997 | ui_out_field_string (uiout, "filename", info->filename); | |
1998 | pids_end = pids; | |
1999 | ||
2000 | while (i < info_count && strcmp (info->filename, array[i]->filename) == 0) | |
2001 | { | |
2002 | if (pids_end != pids) | |
2003 | { | |
2004 | *pids_end++ = ','; | |
2005 | *pids_end++ = ' '; | |
2006 | } | |
2007 | pids_end += xsnprintf (pids_end, &pids[max_pids_len + 1] - pids_end, | |
2008 | "%u", array[i]->pid); | |
2009 | gdb_assert (pids_end < &pids[max_pids_len + 1]); | |
2010 | ||
2011 | i++; | |
2012 | } | |
2013 | *pids_end = '\0'; | |
2014 | ||
2015 | ui_out_field_string (uiout, "pids", pids); | |
2016 | ||
2017 | ui_out_text (uiout, "\n"); | |
2018 | do_cleanups (chain); | |
2019 | } | |
2020 | ||
2021 | do_cleanups (back_to); | |
2022 | ||
2023 | if (info_count == 0) | |
2024 | ui_out_message (uiout, 0, _("No auto-loaded libthread-db.\n")); | |
2025 | } | |
2026 | ||
fb0e1ba7 MK |
2027 | static void |
2028 | init_thread_db_ops (void) | |
2029 | { | |
2030 | thread_db_ops.to_shortname = "multi-thread"; | |
2031 | thread_db_ops.to_longname = "multi-threaded child process."; | |
2032 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
2033 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 2034 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 2035 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 2036 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
fb0e1ba7 MK |
2037 | thread_db_ops.to_find_new_threads = thread_db_find_new_threads; |
2038 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; | |
2039 | thread_db_ops.to_stratum = thread_stratum; | |
2040 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
2041 | thread_db_ops.to_get_thread_local_address |
2042 | = thread_db_get_thread_local_address; | |
28b17333 | 2043 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 2044 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 MK |
2045 | thread_db_ops.to_magic = OPS_MAGIC; |
2046 | } | |
2047 | ||
2c0b251b PA |
2048 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
2049 | extern initialize_file_ftype _initialize_thread_db; | |
2050 | ||
fb0e1ba7 MK |
2051 | void |
2052 | _initialize_thread_db (void) | |
2053 | { | |
17a37d48 PP |
2054 | init_thread_db_ops (); |
2055 | add_target (&thread_db_ops); | |
2056 | ||
2057 | /* Defer loading of libthread_db.so until inferior is running. | |
2058 | This allows gdb to load correct libthread_db for a given | |
2059 | executable -- there could be mutiple versions of glibc, | |
2060 | compiled with LinuxThreads or NPTL, and until there is | |
2061 | a running inferior, we can't tell which libthread_db is | |
1777feb0 | 2062 | the correct one to load. */ |
17a37d48 PP |
2063 | |
2064 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
2065 | ||
2066 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
2067 | class_support, | |
2068 | &libthread_db_search_path, _("\ | |
2069 | Set search path for libthread_db."), _("\ | |
2070 | Show the current search path or libthread_db."), _("\ | |
2071 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
2072 | gdb itself.\n\ |
2073 | Its value is a colon (':') separate list of directories to search.\n\ | |
2074 | Setting the search path to an empty list resets it to its default value."), | |
2075 | set_libthread_db_search_path, | |
17a37d48 PP |
2076 | NULL, |
2077 | &setlist, &showlist); | |
02d868e8 PP |
2078 | |
2079 | add_setshow_zinteger_cmd ("libthread-db", class_maintenance, | |
2080 | &libthread_db_debug, _("\ | |
2081 | Set libthread-db debugging."), _("\ | |
2082 | Show libthread-db debugging."), _("\ | |
2083 | When non-zero, libthread-db debugging is enabled."), | |
2084 | NULL, | |
2085 | show_libthread_db_debug, | |
2086 | &setdebuglist, &showdebuglist); | |
2087 | ||
bf88dd68 JK |
2088 | add_setshow_boolean_cmd ("libthread-db", class_support, |
2089 | &auto_load_thread_db, _("\ | |
2090 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
2091 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
2092 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
2093 | locations to load libthread_db compatible with the inferior.\n\ | |
2094 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
2095 | This options has security implications for untrusted inferiors."), | |
2096 | NULL, show_auto_load_thread_db, | |
2097 | auto_load_set_cmdlist_get (), | |
2098 | auto_load_show_cmdlist_get ()); | |
2099 | ||
2100 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
2101 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
2102 | Usage: info auto-load libthread-db"), | |
2103 | auto_load_info_cmdlist_get ()); | |
2104 | ||
17a37d48 PP |
2105 | /* Add ourselves to objfile event chain. */ |
2106 | observer_attach_new_objfile (thread_db_new_objfile); | |
0838fb57 DE |
2107 | |
2108 | /* Add ourselves to inferior_created event chain. | |
2109 | This is needed to handle debugging statically linked programs where | |
2110 | the new_objfile observer won't get called for libpthread. */ | |
2111 | observer_attach_inferior_created (thread_db_inferior_created); | |
fb0e1ba7 | 2112 | } |