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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
32d0add0 | 3 | Copyright (C) 1999-2015 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" | |
fb0e1ba7 MK |
21 | #include <dlfcn.h> |
22 | #include "gdb_proc_service.h" | |
125f8a3d | 23 | #include "nat/gdb_thread_db.h" |
e6712ff1 | 24 | #include "gdb_vecs.h" |
bda9cb72 | 25 | #include "bfd.h" |
17a37d48 | 26 | #include "command.h" |
17a37d48 | 27 | #include "gdbcmd.h" |
fb0e1ba7 MK |
28 | #include "gdbthread.h" |
29 | #include "inferior.h" | |
45741a9c | 30 | #include "infrun.h" |
bda9cb72 MK |
31 | #include "symfile.h" |
32 | #include "objfiles.h" | |
fb0e1ba7 | 33 | #include "target.h" |
4e052eda | 34 | #include "regcache.h" |
17a37d48 | 35 | #include "solib.h" |
3f47be5c | 36 | #include "solib-svr4.h" |
16451949 | 37 | #include "gdbcore.h" |
06d3b283 | 38 | #include "observer.h" |
0ec9a092 | 39 | #include "linux-nat.h" |
125f8a3d | 40 | #include "nat/linux-procfs.h" |
c1a747c1 | 41 | #include "nat/linux-ptrace.h" |
125f8a3d | 42 | #include "nat/linux-osdata.h" |
bf88dd68 | 43 | #include "auto-load.h" |
529480d0 | 44 | #include "cli/cli-utils.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 | ||
c1a747c1 PA |
81 | /* Returns true if we need to use thread_db thread create/death event |
82 | breakpoints to learn about threads. */ | |
83 | ||
84 | static int | |
85 | thread_db_use_events (void) | |
86 | { | |
87 | /* Not necessary if the kernel supports clone events. */ | |
88 | return !linux_supports_traceclone (); | |
89 | } | |
90 | ||
bf88dd68 JK |
91 | /* "show" command for the auto_load_thread_db configuration variable. */ |
92 | ||
93 | static void | |
94 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
95 | struct cmd_list_element *c, const char *value) | |
96 | { | |
97 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
98 | "is %s.\n"), | |
99 | value); | |
100 | } | |
101 | ||
84e578fb DE |
102 | static void |
103 | set_libthread_db_search_path (char *ignored, int from_tty, | |
104 | struct cmd_list_element *c) | |
105 | { | |
106 | if (*libthread_db_search_path == '\0') | |
107 | { | |
108 | xfree (libthread_db_search_path); | |
109 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
110 | } | |
111 | } | |
112 | ||
02d868e8 PP |
113 | /* If non-zero, print details of libthread_db processing. */ |
114 | ||
ccce17b0 | 115 | static unsigned int libthread_db_debug; |
02d868e8 PP |
116 | |
117 | static void | |
118 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
119 | struct cmd_list_element *c, const char *value) | |
120 | { | |
121 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
122 | } | |
123 | ||
8605d56e AC |
124 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
125 | threads. */ | |
fb0e1ba7 | 126 | |
fb0e1ba7 MK |
127 | /* This module's target vector. */ |
128 | static struct target_ops thread_db_ops; | |
129 | ||
fb0e1ba7 MK |
130 | /* Non-zero if we have determined the signals used by the threads |
131 | library. */ | |
132 | static int thread_signals; | |
133 | static sigset_t thread_stop_set; | |
134 | static sigset_t thread_print_set; | |
135 | ||
d90e17a7 PA |
136 | struct thread_db_info |
137 | { | |
138 | struct thread_db_info *next; | |
139 | ||
140 | /* Process id this object refers to. */ | |
141 | int pid; | |
142 | ||
143 | /* Handle from dlopen for libthread_db.so. */ | |
144 | void *handle; | |
145 | ||
bf88dd68 JK |
146 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
147 | HANDLE. It may be NULL for system library. */ | |
148 | char *filename; | |
149 | ||
d90e17a7 PA |
150 | /* Structure that identifies the child process for the |
151 | <proc_service.h> interface. */ | |
152 | struct ps_prochandle proc_handle; | |
153 | ||
154 | /* Connection to the libthread_db library. */ | |
155 | td_thragent_t *thread_agent; | |
156 | ||
4d062f1a PA |
157 | /* True if we need to apply the workaround for glibc/BZ5983. When |
158 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
159 | list, nptl_db returns the parent's threads in addition to the new | |
160 | (single) child thread. If this flag is set, we do extra work to | |
161 | be able to ignore such stale entries. */ | |
162 | int need_stale_parent_threads_check; | |
163 | ||
d90e17a7 PA |
164 | /* Location of the thread creation event breakpoint. The code at |
165 | this location in the child process will be called by the pthread | |
166 | library whenever a new thread is created. By setting a special | |
167 | breakpoint at this location, GDB can detect when a new thread is | |
168 | created. We obtain this location via the td_ta_event_addr | |
169 | call. */ | |
170 | CORE_ADDR td_create_bp_addr; | |
fb0e1ba7 | 171 | |
d90e17a7 PA |
172 | /* Location of the thread death event breakpoint. */ |
173 | CORE_ADDR td_death_bp_addr; | |
fb0e1ba7 | 174 | |
d90e17a7 | 175 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 176 | |
d90e17a7 | 177 | td_err_e (*td_init_p) (void); |
fb0e1ba7 | 178 | |
d90e17a7 | 179 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, |
b4acd559 | 180 | td_thragent_t **ta); |
d90e17a7 PA |
181 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, |
182 | lwpid_t lwpid, td_thrhandle_t *th); | |
183 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
184 | td_thr_iter_f *callback, void *cbdata_p, | |
185 | td_thr_state_e state, int ti_pri, | |
186 | sigset_t *ti_sigmask_p, | |
187 | unsigned int ti_user_flags); | |
188 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
189 | td_event_e event, td_notify_t *ptr); | |
190 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
191 | td_thr_events_t *event); | |
21e1bee4 PP |
192 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
193 | td_thr_events_t *event); | |
d90e17a7 PA |
194 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
195 | td_event_msg_t *msg); | |
196 | ||
d90e17a7 PA |
197 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, |
198 | td_thrinfo_t *infop); | |
199 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, | |
200 | int event); | |
201 | ||
202 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
203 | psaddr_t map_address, |
204 | size_t offset, psaddr_t *address); | |
5876f503 JK |
205 | td_err_e (*td_thr_tlsbase_p) (const td_thrhandle_t *th, |
206 | unsigned long int modid, | |
207 | psaddr_t *base); | |
d90e17a7 PA |
208 | }; |
209 | ||
210 | /* List of known processes using thread_db, and the required | |
211 | bookkeeping. */ | |
212 | struct thread_db_info *thread_db_list; | |
213 | ||
214 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 215 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 | 216 | |
2db9a427 PA |
217 | static void check_thread_signals (void); |
218 | ||
219 | static void record_thread (struct thread_db_info *info, | |
220 | struct thread_info *tp, | |
221 | ptid_t ptid, const td_thrhandle_t *th_p, | |
222 | const td_thrinfo_t *ti_p); | |
223 | ||
d90e17a7 PA |
224 | /* Add the current inferior to the list of processes using libpthread. |
225 | Return a pointer to the newly allocated object that was added to | |
226 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
227 | LIBTHREAD_DB_SO. */ | |
228 | ||
229 | static struct thread_db_info * | |
230 | add_thread_db_info (void *handle) | |
231 | { | |
d90e17a7 PA |
232 | struct thread_db_info *info; |
233 | ||
234 | info = xcalloc (1, sizeof (*info)); | |
235 | info->pid = ptid_get_pid (inferior_ptid); | |
236 | info->handle = handle; | |
856d6f99 PA |
237 | |
238 | /* The workaround works by reading from /proc/pid/status, so it is | |
239 | disabled for core files. */ | |
240 | if (target_has_execution) | |
241 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
242 | |
243 | info->next = thread_db_list; | |
244 | thread_db_list = info; | |
245 | ||
246 | return info; | |
247 | } | |
248 | ||
249 | /* Return the thread_db_info object representing the bookkeeping | |
250 | related to process PID, if any; NULL otherwise. */ | |
251 | ||
252 | static struct thread_db_info * | |
253 | get_thread_db_info (int pid) | |
254 | { | |
255 | struct thread_db_info *info; | |
256 | ||
257 | for (info = thread_db_list; info; info = info->next) | |
258 | if (pid == info->pid) | |
259 | return info; | |
260 | ||
261 | return NULL; | |
262 | } | |
263 | ||
264 | /* When PID has exited or has been detached, we no longer want to keep | |
265 | track of it as using libpthread. Call this function to discard | |
266 | thread_db related info related to PID. Note that this closes | |
267 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
268 | ||
269 | static void | |
270 | delete_thread_db_info (int pid) | |
271 | { | |
272 | struct thread_db_info *info, *info_prev; | |
273 | ||
274 | info_prev = NULL; | |
275 | ||
276 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
277 | if (pid == info->pid) | |
278 | break; | |
279 | ||
280 | if (info == NULL) | |
281 | return; | |
282 | ||
283 | if (info->handle != NULL) | |
284 | dlclose (info->handle); | |
285 | ||
bf88dd68 JK |
286 | xfree (info->filename); |
287 | ||
d90e17a7 PA |
288 | if (info_prev) |
289 | info_prev->next = info->next; | |
290 | else | |
291 | thread_db_list = info->next; | |
292 | ||
293 | xfree (info); | |
294 | } | |
fb0e1ba7 MK |
295 | |
296 | /* Prototypes for local functions. */ | |
02c6c942 PP |
297 | static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
298 | const td_thrinfo_t *ti_p); | |
17faa917 | 299 | static void detach_thread (ptid_t ptid); |
fb0e1ba7 MK |
300 | \f |
301 | ||
5365276c DJ |
302 | /* Use "struct private_thread_info" to cache thread state. This is |
303 | a substantial optimization. */ | |
304 | ||
fb0e1ba7 MK |
305 | struct private_thread_info |
306 | { | |
a2f23071 DJ |
307 | /* Flag set when we see a TD_DEATH event for this thread. */ |
308 | unsigned int dying:1; | |
309 | ||
5365276c | 310 | /* Cached thread state. */ |
5365276c | 311 | td_thrhandle_t th; |
17faa917 | 312 | thread_t tid; |
fb0e1ba7 | 313 | }; |
fb0e1ba7 | 314 | \f |
21bf60fe | 315 | |
fb0e1ba7 MK |
316 | static char * |
317 | thread_db_err_str (td_err_e err) | |
318 | { | |
319 | static char buf[64]; | |
320 | ||
321 | switch (err) | |
322 | { | |
323 | case TD_OK: | |
324 | return "generic 'call succeeded'"; | |
325 | case TD_ERR: | |
326 | return "generic error"; | |
327 | case TD_NOTHR: | |
328 | return "no thread to satisfy query"; | |
329 | case TD_NOSV: | |
330 | return "no sync handle to satisfy query"; | |
331 | case TD_NOLWP: | |
332 | return "no LWP to satisfy query"; | |
333 | case TD_BADPH: | |
334 | return "invalid process handle"; | |
335 | case TD_BADTH: | |
336 | return "invalid thread handle"; | |
337 | case TD_BADSH: | |
338 | return "invalid synchronization handle"; | |
339 | case TD_BADTA: | |
340 | return "invalid thread agent"; | |
341 | case TD_BADKEY: | |
342 | return "invalid key"; | |
343 | case TD_NOMSG: | |
344 | return "no event message for getmsg"; | |
345 | case TD_NOFPREGS: | |
346 | return "FPU register set not available"; | |
347 | case TD_NOLIBTHREAD: | |
348 | return "application not linked with libthread"; | |
349 | case TD_NOEVENT: | |
350 | return "requested event is not supported"; | |
351 | case TD_NOCAPAB: | |
352 | return "capability not available"; | |
353 | case TD_DBERR: | |
354 | return "debugger service failed"; | |
355 | case TD_NOAPLIC: | |
356 | return "operation not applicable to"; | |
357 | case TD_NOTSD: | |
358 | return "no thread-specific data for this thread"; | |
359 | case TD_MALLOC: | |
360 | return "malloc failed"; | |
361 | case TD_PARTIALREG: | |
362 | return "only part of register set was written/read"; | |
363 | case TD_NOXREGS: | |
364 | return "X register set not available for this thread"; | |
59f80f10 DJ |
365 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
366 | case TD_NOTALLOC: | |
367 | return "thread has not yet allocated TLS for given module"; | |
368 | #endif | |
369 | #ifdef THREAD_DB_HAS_TD_VERSION | |
370 | case TD_VERSION: | |
371 | return "versions of libpthread and libthread_db do not match"; | |
372 | #endif | |
373 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
374 | case TD_NOTLS: | |
375 | return "there is no TLS segment in the given module"; | |
376 | #endif | |
fb0e1ba7 MK |
377 | default: |
378 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
379 | return buf; | |
380 | } | |
381 | } | |
fb0e1ba7 | 382 | \f |
4105de34 DJ |
383 | /* Return 1 if any threads have been registered. There may be none if |
384 | the threading library is not fully initialized yet. */ | |
385 | ||
386 | static int | |
d90e17a7 | 387 | have_threads_callback (struct thread_info *thread, void *args) |
4105de34 | 388 | { |
d90e17a7 | 389 | int pid = * (int *) args; |
e0881a8e | 390 | |
d90e17a7 PA |
391 | if (ptid_get_pid (thread->ptid) != pid) |
392 | return 0; | |
393 | ||
fe978cb0 | 394 | return thread->priv != NULL; |
4105de34 DJ |
395 | } |
396 | ||
397 | static int | |
d90e17a7 | 398 | have_threads (ptid_t ptid) |
4105de34 | 399 | { |
d90e17a7 PA |
400 | int pid = ptid_get_pid (ptid); |
401 | ||
402 | return iterate_over_threads (have_threads_callback, &pid) != NULL; | |
4105de34 DJ |
403 | } |
404 | ||
5365276c | 405 | \f |
64776a0b | 406 | /* Fetch the user-level thread id of PTID. */ |
fb0e1ba7 | 407 | |
64776a0b | 408 | static void |
39f77062 | 409 | thread_from_lwp (ptid_t ptid) |
fb0e1ba7 | 410 | { |
fb0e1ba7 | 411 | td_thrhandle_t th; |
2db9a427 | 412 | td_thrinfo_t ti; |
fb0e1ba7 | 413 | td_err_e err; |
d90e17a7 | 414 | struct thread_db_info *info; |
2db9a427 | 415 | struct thread_info *tp; |
fb0e1ba7 | 416 | |
6cb9b55b PP |
417 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
418 | th.th_unique = 0; | |
419 | ||
17faa917 DJ |
420 | /* This ptid comes from linux-nat.c, which should always fill in the |
421 | LWP. */ | |
dfd4cc63 | 422 | gdb_assert (ptid_get_lwp (ptid) != 0); |
fb0e1ba7 | 423 | |
dfd4cc63 | 424 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 425 | |
4c28f408 | 426 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 427 | info->proc_handle.ptid = ptid; |
dfd4cc63 LM |
428 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid), |
429 | &th); | |
fb0e1ba7 | 430 | if (err != TD_OK) |
8a3fe4f8 | 431 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
dfd4cc63 | 432 | ptid_get_lwp (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 433 | |
2db9a427 PA |
434 | err = info->td_thr_get_info_p (&th, &ti); |
435 | if (err != TD_OK) | |
436 | error (_("thread_get_info_callback: cannot get thread info: %s"), | |
437 | thread_db_err_str (err)); | |
438 | ||
439 | /* Fill the cache. */ | |
440 | tp = find_thread_ptid (ptid); | |
441 | record_thread (info, tp, ptid, &th, &ti); | |
fb0e1ba7 MK |
442 | } |
443 | \f | |
444 | ||
2db9a427 PA |
445 | /* See linux-nat.h. */ |
446 | ||
4c28f408 | 447 | int |
2db9a427 | 448 | thread_db_notice_clone (ptid_t parent, ptid_t child) |
4c28f408 PA |
449 | { |
450 | td_thrhandle_t th; | |
451 | td_thrinfo_t ti; | |
452 | td_err_e err; | |
d90e17a7 | 453 | struct thread_db_info *info; |
4c28f408 | 454 | |
2db9a427 | 455 | info = get_thread_db_info (ptid_get_pid (child)); |
d90e17a7 PA |
456 | |
457 | if (info == NULL) | |
4c28f408 PA |
458 | return 0; |
459 | ||
2db9a427 | 460 | thread_from_lwp (child); |
4c28f408 | 461 | |
2db9a427 PA |
462 | /* If we do not know about the main thread yet, this would be a good |
463 | time to find it. */ | |
464 | thread_from_lwp (parent); | |
4c28f408 PA |
465 | return 1; |
466 | } | |
467 | ||
5220ea4c AC |
468 | static void * |
469 | verbose_dlsym (void *handle, const char *name) | |
470 | { | |
471 | void *sym = dlsym (handle, name); | |
472 | if (sym == NULL) | |
3e43a32a MS |
473 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
474 | name, dlerror ()); | |
5220ea4c AC |
475 | return sym; |
476 | } | |
477 | ||
cdbc0b18 | 478 | static td_err_e |
d90e17a7 | 479 | enable_thread_event (int event, CORE_ADDR *bp) |
24557e30 AC |
480 | { |
481 | td_notify_t notify; | |
cdbc0b18 | 482 | td_err_e err; |
d90e17a7 PA |
483 | struct thread_db_info *info; |
484 | ||
dfd4cc63 | 485 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
24557e30 | 486 | |
4c28f408 | 487 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 488 | info->proc_handle.ptid = inferior_ptid; |
4c28f408 | 489 | |
24557e30 | 490 | /* Get the breakpoint address for thread EVENT. */ |
d90e17a7 | 491 | err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify); |
24557e30 | 492 | if (err != TD_OK) |
cdbc0b18 | 493 | return err; |
24557e30 AC |
494 | |
495 | /* Set up the breakpoint. */ | |
16451949 AS |
496 | gdb_assert (exec_bfd); |
497 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
f5656ead | 498 | (target_gdbarch (), |
16451949 AS |
499 | /* Do proper sign extension for the target. */ |
500 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
501 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
502 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
503 | ¤t_target)); | |
f5656ead | 504 | create_thread_event_breakpoint (target_gdbarch (), *bp); |
24557e30 | 505 | |
cdbc0b18 | 506 | return TD_OK; |
24557e30 AC |
507 | } |
508 | ||
fcb44371 JK |
509 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
510 | return 1 if this version is lower (and not equal) to | |
511 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
512 | ||
513 | static int | |
514 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
515 | { | |
3b7344d5 | 516 | struct bound_minimal_symbol version_msym; |
fcb44371 JK |
517 | CORE_ADDR version_addr; |
518 | char *version; | |
519 | int err, got, retval = 0; | |
520 | ||
521 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 522 | if (version_msym.minsym == NULL) |
fcb44371 JK |
523 | return 0; |
524 | ||
77e371c0 | 525 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
fcb44371 JK |
526 | got = target_read_string (version_addr, &version, 32, &err); |
527 | if (err == 0 && memchr (version, 0, got) == &version[got -1]) | |
528 | { | |
529 | int major, minor; | |
530 | ||
531 | retval = (sscanf (version, "%d.%d", &major, &minor) == 2 | |
532 | && (major < ver_major_min | |
533 | || (major == ver_major_min && minor < ver_minor_min))); | |
534 | } | |
535 | xfree (version); | |
536 | ||
537 | return retval; | |
538 | } | |
539 | ||
fb0e1ba7 MK |
540 | static void |
541 | enable_thread_event_reporting (void) | |
542 | { | |
543 | td_thr_events_t events; | |
fb0e1ba7 | 544 | td_err_e err; |
d90e17a7 PA |
545 | struct thread_db_info *info; |
546 | ||
dfd4cc63 | 547 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 MK |
548 | |
549 | /* We cannot use the thread event reporting facility if these | |
550 | functions aren't available. */ | |
d90e17a7 PA |
551 | if (info->td_ta_event_addr_p == NULL |
552 | || info->td_ta_set_event_p == NULL | |
553 | || info->td_ta_event_getmsg_p == NULL | |
554 | || info->td_thr_event_enable_p == NULL) | |
fb0e1ba7 MK |
555 | return; |
556 | ||
557 | /* Set the process wide mask saying which events we're interested in. */ | |
558 | td_event_emptyset (&events); | |
559 | td_event_addset (&events, TD_CREATE); | |
a2f23071 | 560 | |
8775fd2d JK |
561 | /* There is a bug fixed between linuxthreads 2.1.3 and 2.2 by |
562 | commit 2e4581e4fba917f1779cd0a010a45698586c190a | |
563 | * manager.c (pthread_exited): Correctly report event as TD_REAP | |
564 | instead of TD_DEATH. Fix comments. | |
565 | where event reporting facility is broken for TD_DEATH events, | |
566 | so don't enable it if we have glibc but a lower version. */ | |
567 | if (!inferior_has_bug ("__linuxthreads_version", 2, 2)) | |
a2f23071 | 568 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 | 569 | |
d90e17a7 | 570 | err = info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
571 | if (err != TD_OK) |
572 | { | |
8a3fe4f8 | 573 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
574 | thread_db_err_str (err)); |
575 | return; | |
576 | } | |
577 | ||
578 | /* Delete previous thread event breakpoints, if any. */ | |
579 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
580 | info->td_create_bp_addr = 0; |
581 | info->td_death_bp_addr = 0; | |
fb0e1ba7 | 582 | |
24557e30 | 583 | /* Set up the thread creation event. */ |
d90e17a7 | 584 | err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr); |
cdbc0b18 | 585 | if (err != TD_OK) |
fb0e1ba7 | 586 | { |
8a3fe4f8 | 587 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
588 | thread_db_err_str (err)); |
589 | return; | |
590 | } | |
591 | ||
24557e30 | 592 | /* Set up the thread death event. */ |
d90e17a7 | 593 | err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr); |
cdbc0b18 | 594 | if (err != TD_OK) |
fb0e1ba7 | 595 | { |
8a3fe4f8 | 596 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
597 | thread_db_err_str (err)); |
598 | return; | |
599 | } | |
fb0e1ba7 MK |
600 | } |
601 | ||
fcb44371 JK |
602 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
603 | if appropriate. | |
456b0e24 | 604 | |
fcb44371 JK |
605 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
606 | otherwise. */ | |
607 | ||
608 | static int | |
456b0e24 PP |
609 | thread_db_find_new_threads_silently (ptid_t ptid) |
610 | { | |
456b0e24 | 611 | |
492d29ea | 612 | TRY |
456b0e24 | 613 | { |
02c6c942 | 614 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
615 | } |
616 | ||
492d29ea | 617 | CATCH (except, RETURN_MASK_ERROR) |
e0881a8e | 618 | { |
fcb44371 | 619 | if (libthread_db_debug) |
883ed13e | 620 | exception_fprintf (gdb_stdlog, except, |
fcb44371 JK |
621 | "Warning: thread_db_find_new_threads_silently: "); |
622 | ||
623 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
624 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
625 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
626 | executables if td_thr_get_info is called before glibc has initialized | |
627 | itself. | |
628 | ||
629 | If the nptl bug is NOT present in the inferior and still thread_db | |
630 | reports an error return 1. It means the inferior has corrupted thread | |
631 | list and GDB should fall back only to LWPs. | |
632 | ||
633 | If the nptl bug is present in the inferior return 0 to silently ignore | |
634 | such errors, and let gdb enumerate threads again later. In such case | |
635 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
636 | corrupted. For core files it does not apply, no 'later enumeration' |
637 | is possible. */ | |
fcb44371 | 638 | |
889003ed | 639 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
640 | { |
641 | exception_fprintf (gdb_stderr, except, | |
642 | _("Warning: couldn't activate thread debugging " | |
643 | "using libthread_db: ")); | |
644 | return 1; | |
645 | } | |
e0881a8e | 646 | } |
492d29ea PA |
647 | END_CATCH |
648 | ||
fcb44371 | 649 | return 0; |
456b0e24 PP |
650 | } |
651 | ||
d90e17a7 PA |
652 | /* Lookup a library in which given symbol resides. |
653 | Note: this is looking in GDB process, not in the inferior. | |
654 | Returns library name, or NULL. */ | |
655 | ||
656 | static const char * | |
657 | dladdr_to_soname (const void *addr) | |
658 | { | |
659 | Dl_info info; | |
660 | ||
661 | if (dladdr (addr, &info) != 0) | |
662 | return info.dli_fname; | |
663 | return NULL; | |
664 | } | |
665 | ||
2471d008 | 666 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
667 | Return 1 on success. |
668 | Failure could happen if libthread_db does not have symbols we expect, | |
669 | or when it refuses to work with the current inferior (e.g. due to | |
670 | version mismatch between libthread_db and libpthread). */ | |
671 | ||
672 | static int | |
d90e17a7 | 673 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
674 | { |
675 | td_err_e err; | |
676 | ||
677 | /* Initialize pointers to the dynamic library functions we will use. | |
678 | Essential functions first. */ | |
679 | ||
d90e17a7 PA |
680 | info->td_init_p = verbose_dlsym (info->handle, "td_init"); |
681 | if (info->td_init_p == NULL) | |
17a37d48 PP |
682 | return 0; |
683 | ||
d90e17a7 | 684 | err = info->td_init_p (); |
17a37d48 PP |
685 | if (err != TD_OK) |
686 | { | |
3e43a32a MS |
687 | warning (_("Cannot initialize libthread_db: %s"), |
688 | thread_db_err_str (err)); | |
17a37d48 PP |
689 | return 0; |
690 | } | |
691 | ||
d90e17a7 PA |
692 | info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new"); |
693 | if (info->td_ta_new_p == NULL) | |
17a37d48 PP |
694 | return 0; |
695 | ||
696 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 697 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
698 | |
699 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 700 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
701 | if (err != TD_OK) |
702 | { | |
02d868e8 | 703 | if (libthread_db_debug) |
883ed13e PA |
704 | fprintf_unfiltered (gdb_stdlog, _("td_ta_new failed: %s\n"), |
705 | thread_db_err_str (err)); | |
17a37d48 PP |
706 | else |
707 | switch (err) | |
708 | { | |
709 | case TD_NOLIBTHREAD: | |
710 | #ifdef THREAD_DB_HAS_TD_VERSION | |
711 | case TD_VERSION: | |
712 | #endif | |
713 | /* The errors above are not unexpected and silently ignored: | |
714 | they just mean we haven't found correct version of | |
715 | libthread_db yet. */ | |
716 | break; | |
717 | default: | |
718 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
719 | } | |
720 | return 0; | |
721 | } | |
722 | ||
3e43a32a MS |
723 | info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, |
724 | "td_ta_map_lwp2thr"); | |
d90e17a7 | 725 | if (info->td_ta_map_lwp2thr_p == NULL) |
17a37d48 PP |
726 | return 0; |
727 | ||
d90e17a7 PA |
728 | info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter"); |
729 | if (info->td_ta_thr_iter_p == NULL) | |
17a37d48 PP |
730 | return 0; |
731 | ||
d90e17a7 PA |
732 | info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info"); |
733 | if (info->td_thr_get_info_p == NULL) | |
17a37d48 PP |
734 | return 0; |
735 | ||
736 | /* These are not essential. */ | |
d90e17a7 PA |
737 | info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr"); |
738 | info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event"); | |
21e1bee4 | 739 | info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event"); |
d90e17a7 PA |
740 | info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); |
741 | info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); | |
742 | info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); | |
5876f503 | 743 | info->td_thr_tlsbase_p = dlsym (info->handle, "td_thr_tlsbase"); |
17a37d48 | 744 | |
2db9a427 PA |
745 | /* It's best to avoid td_ta_thr_iter if possible. That walks data |
746 | structures in the inferior's address space that may be corrupted, | |
747 | or, if the target is running, may change while we walk them. If | |
748 | there's execution (and /proc is mounted), then we're already | |
749 | attached to all LWPs. Use thread_from_lwp, which uses | |
750 | td_ta_map_lwp2thr instead, which does not walk the thread list. | |
751 | ||
752 | td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that | |
753 | currently on core targets, as it uses ptrace directly. */ | |
754 | if (target_has_execution | |
755 | && linux_proc_task_list_dir_exists (ptid_get_pid (inferior_ptid))) | |
756 | { | |
757 | struct lwp_info *lp; | |
758 | int pid = ptid_get_pid (inferior_ptid); | |
759 | ||
760 | linux_stop_and_wait_all_lwps (); | |
761 | ||
762 | ALL_LWPS (lp) | |
763 | if (ptid_get_pid (lp->ptid) == pid) | |
764 | thread_from_lwp (lp->ptid); | |
765 | ||
766 | linux_unstop_all_lwps (); | |
767 | } | |
768 | else if (thread_db_find_new_threads_silently (inferior_ptid) != 0) | |
fcb44371 JK |
769 | { |
770 | /* Even if libthread_db initializes, if the thread list is | |
771 | corrupted, we'd not manage to list any threads. Better reject this | |
772 | thread_db, and fall back to at least listing LWPs. */ | |
773 | return 0; | |
774 | } | |
775 | ||
17a37d48 PP |
776 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
777 | ||
883ed13e | 778 | if (*libthread_db_search_path || libthread_db_debug) |
d90e17a7 | 779 | { |
883ed13e | 780 | struct ui_file *file; |
d90e17a7 | 781 | const char *library; |
17a37d48 | 782 | |
d90e17a7 PA |
783 | library = dladdr_to_soname (*info->td_ta_new_p); |
784 | if (library == NULL) | |
785 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 786 | |
883ed13e PA |
787 | /* If we'd print this to gdb_stdout when debug output is |
788 | disabled, still print it to gdb_stdout if debug output is | |
789 | enabled. User visible output should not depend on debug | |
790 | settings. */ | |
791 | file = *libthread_db_search_path != '\0' ? gdb_stdout : gdb_stdlog; | |
792 | fprintf_unfiltered (file, _("Using host libthread_db library \"%s\".\n"), | |
793 | library); | |
d90e17a7 | 794 | } |
17a37d48 | 795 | |
d90e17a7 PA |
796 | /* The thread library was detected. Activate the thread_db target |
797 | if this is the first process using it. */ | |
798 | if (thread_db_list->next == NULL) | |
799 | push_target (&thread_db_ops); | |
17a37d48 | 800 | |
856d6f99 | 801 | /* Enable event reporting, but not when debugging a core file. */ |
c1a747c1 | 802 | if (target_has_execution && thread_db_use_events ()) |
856d6f99 | 803 | enable_thread_event_reporting (); |
456b0e24 | 804 | |
d90e17a7 | 805 | return 1; |
17a37d48 PP |
806 | } |
807 | ||
808 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
809 | relative, or just LIBTHREAD_DB. */ | |
810 | ||
811 | static int | |
fde4f8ed | 812 | try_thread_db_load (const char *library, int check_auto_load_safe) |
17a37d48 PP |
813 | { |
814 | void *handle; | |
d90e17a7 | 815 | struct thread_db_info *info; |
17a37d48 | 816 | |
02d868e8 | 817 | if (libthread_db_debug) |
883ed13e PA |
818 | fprintf_unfiltered (gdb_stdlog, |
819 | _("Trying host libthread_db library: %s.\n"), | |
820 | library); | |
fde4f8ed JK |
821 | |
822 | if (check_auto_load_safe) | |
823 | { | |
824 | if (access (library, R_OK) != 0) | |
825 | { | |
826 | /* Do not print warnings by file_is_auto_load_safe if the library does | |
827 | not exist at this place. */ | |
828 | if (libthread_db_debug) | |
883ed13e PA |
829 | fprintf_unfiltered (gdb_stdlog, _("open failed: %s.\n"), |
830 | safe_strerror (errno)); | |
fde4f8ed JK |
831 | return 0; |
832 | } | |
833 | ||
834 | if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db " | |
835 | "library \"%s\" from explicit " | |
836 | "directory.\n"), | |
837 | library)) | |
838 | return 0; | |
839 | } | |
840 | ||
17a37d48 PP |
841 | handle = dlopen (library, RTLD_NOW); |
842 | if (handle == NULL) | |
843 | { | |
02d868e8 | 844 | if (libthread_db_debug) |
883ed13e | 845 | fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ()); |
17a37d48 PP |
846 | return 0; |
847 | } | |
848 | ||
02d868e8 | 849 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
850 | { |
851 | void *td_init; | |
852 | ||
853 | td_init = dlsym (handle, "td_init"); | |
854 | if (td_init != NULL) | |
855 | { | |
856 | const char *const libpath = dladdr_to_soname (td_init); | |
857 | ||
858 | if (libpath != NULL) | |
883ed13e | 859 | fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"), |
17a37d48 PP |
860 | library, libpath); |
861 | } | |
862 | } | |
863 | ||
d90e17a7 PA |
864 | info = add_thread_db_info (handle); |
865 | ||
bf88dd68 JK |
866 | /* Do not save system library name, that one is always trusted. */ |
867 | if (strchr (library, '/') != NULL) | |
868 | info->filename = gdb_realpath (library); | |
869 | ||
d90e17a7 | 870 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
871 | return 1; |
872 | ||
873 | /* This library "refused" to work on current inferior. */ | |
dfd4cc63 | 874 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
17a37d48 PP |
875 | return 0; |
876 | } | |
877 | ||
290351b8 | 878 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
879 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
880 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
881 | The result is true for success. */ |
882 | ||
883 | static int | |
e6712ff1 | 884 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 885 | { |
05386e9e TT |
886 | struct cleanup *cleanup; |
887 | char *path, *cp; | |
888 | int result; | |
4262abfb | 889 | const char *obj_name = objfile_name (obj); |
290351b8 | 890 | |
4262abfb | 891 | if (obj_name[0] != '/') |
290351b8 DE |
892 | { |
893 | warning (_("Expected absolute pathname for libpthread in the" | |
4262abfb | 894 | " inferior, but got %s."), obj_name); |
290351b8 DE |
895 | return 0; |
896 | } | |
05386e9e | 897 | |
4262abfb | 898 | path = xmalloc (strlen (obj_name) + (subdir ? strlen (subdir) + 1 : 0) |
e6712ff1 | 899 | + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
05386e9e TT |
900 | cleanup = make_cleanup (xfree, path); |
901 | ||
4262abfb | 902 | strcpy (path, obj_name); |
05386e9e TT |
903 | cp = strrchr (path, '/'); |
904 | /* This should at minimum hit the first character. */ | |
905 | gdb_assert (cp != NULL); | |
e6712ff1 DE |
906 | cp[1] = '\0'; |
907 | if (subdir != NULL) | |
908 | { | |
909 | strcat (cp, subdir); | |
910 | strcat (cp, "/"); | |
911 | } | |
912 | strcat (cp, LIBTHREAD_DB_SO); | |
bccbefd2 | 913 | |
fde4f8ed | 914 | result = try_thread_db_load (path, 1); |
05386e9e TT |
915 | |
916 | do_cleanups (cleanup); | |
917 | return result; | |
290351b8 DE |
918 | } |
919 | ||
98a5dd13 | 920 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
921 | Look for libthread_db in directory(libpthread)/SUBDIR. |
922 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
923 | The result is true for success. */ |
924 | ||
925 | static int | |
e6712ff1 | 926 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 DE |
927 | { |
928 | struct objfile *obj; | |
929 | ||
bf88dd68 JK |
930 | if (!auto_load_thread_db) |
931 | return 0; | |
932 | ||
98a5dd13 | 933 | ALL_OBJFILES (obj) |
4262abfb | 934 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 935 | { |
e6712ff1 | 936 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
290351b8 DE |
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) | |
e6712ff1 DE |
943 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
944 | subdir); | |
290351b8 | 945 | |
98a5dd13 DE |
946 | return 0; |
947 | } | |
948 | ||
949 | return 0; | |
950 | } | |
951 | ||
952 | /* Handle $sdir in libthread-db-search-path. | |
953 | Look for libthread_db in the system dirs, or wherever a plain | |
954 | dlopen(file_without_path) will look. | |
955 | The result is true for success. */ | |
956 | ||
957 | static int | |
958 | try_thread_db_load_from_sdir (void) | |
959 | { | |
fde4f8ed | 960 | return try_thread_db_load (LIBTHREAD_DB_SO, 0); |
98a5dd13 DE |
961 | } |
962 | ||
963 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
964 | The result is true for success. */ | |
965 | ||
966 | static int | |
967 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
968 | { | |
05386e9e TT |
969 | struct cleanup *cleanup; |
970 | char *path; | |
971 | int result; | |
98a5dd13 | 972 | |
bf88dd68 JK |
973 | if (!auto_load_thread_db) |
974 | return 0; | |
975 | ||
05386e9e TT |
976 | path = xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
977 | cleanup = make_cleanup (xfree, path); | |
98a5dd13 DE |
978 | |
979 | memcpy (path, dir, dir_len); | |
980 | path[dir_len] = '/'; | |
981 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
bccbefd2 | 982 | |
fde4f8ed | 983 | result = try_thread_db_load (path, 1); |
05386e9e TT |
984 | |
985 | do_cleanups (cleanup); | |
986 | return result; | |
98a5dd13 DE |
987 | } |
988 | ||
17a37d48 | 989 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
990 | to work on current inferior. |
991 | The result is true for success. */ | |
17a37d48 PP |
992 | |
993 | static int | |
994 | thread_db_load_search (void) | |
995 | { | |
e6712ff1 DE |
996 | VEC (char_ptr) *dir_vec; |
997 | struct cleanup *cleanups; | |
998 | char *this_dir; | |
999 | int i, rc = 0; | |
17a37d48 | 1000 | |
e6712ff1 DE |
1001 | dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path); |
1002 | cleanups = make_cleanup_free_char_ptr_vec (dir_vec); | |
1003 | ||
1004 | for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i) | |
17a37d48 | 1005 | { |
e6712ff1 | 1006 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 1007 | size_t this_dir_len; |
e0881a8e | 1008 | |
e6712ff1 | 1009 | this_dir_len = strlen (this_dir); |
17a37d48 | 1010 | |
e6712ff1 DE |
1011 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
1012 | && (this_dir[pdir_len] == '\0' | |
1013 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 1014 | { |
e6712ff1 | 1015 | char *subdir = NULL; |
1fc3cf4a TT |
1016 | struct cleanup *free_subdir_cleanup |
1017 | = make_cleanup (null_cleanup, NULL); | |
e6712ff1 DE |
1018 | |
1019 | if (this_dir[pdir_len] == '/') | |
98a5dd13 | 1020 | { |
e6712ff1 | 1021 | subdir = xmalloc (strlen (this_dir)); |
1fc3cf4a | 1022 | make_cleanup (xfree, subdir); |
e6712ff1 | 1023 | strcpy (subdir, this_dir + pdir_len + 1); |
98a5dd13 | 1024 | } |
e6712ff1 | 1025 | rc = try_thread_db_load_from_pdir (subdir); |
1fc3cf4a | 1026 | do_cleanups (free_subdir_cleanup); |
e6712ff1 DE |
1027 | if (rc) |
1028 | break; | |
17a37d48 | 1029 | } |
e6712ff1 | 1030 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
1031 | { |
1032 | if (try_thread_db_load_from_sdir ()) | |
1033 | { | |
1034 | rc = 1; | |
1035 | break; | |
1036 | } | |
1037 | } | |
1038 | else | |
17a37d48 | 1039 | { |
98a5dd13 DE |
1040 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
1041 | { | |
1042 | rc = 1; | |
1043 | break; | |
1044 | } | |
17a37d48 PP |
1045 | } |
1046 | } | |
98a5dd13 | 1047 | |
e6712ff1 | 1048 | do_cleanups (cleanups); |
98a5dd13 | 1049 | if (libthread_db_debug) |
883ed13e PA |
1050 | fprintf_unfiltered (gdb_stdlog, |
1051 | _("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1052 | return rc; |
1053 | } | |
1054 | ||
98a5dd13 DE |
1055 | /* Return non-zero if the inferior has a libpthread. */ |
1056 | ||
1057 | static int | |
1058 | has_libpthread (void) | |
1059 | { | |
1060 | struct objfile *obj; | |
1061 | ||
1062 | ALL_OBJFILES (obj) | |
4262abfb | 1063 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 DE |
1064 | return 1; |
1065 | ||
1066 | return 0; | |
1067 | } | |
1068 | ||
17a37d48 | 1069 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1070 | Return 1 on success. */ |
17a37d48 PP |
1071 | |
1072 | static int | |
1073 | thread_db_load (void) | |
1074 | { | |
d90e17a7 | 1075 | struct thread_db_info *info; |
17a37d48 | 1076 | |
dfd4cc63 | 1077 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 PA |
1078 | |
1079 | if (info != NULL) | |
17a37d48 PP |
1080 | return 1; |
1081 | ||
856d6f99 PA |
1082 | /* Don't attempt to use thread_db on executables not running |
1083 | yet. */ | |
1084 | if (!target_has_registers) | |
17a37d48 PP |
1085 | return 0; |
1086 | ||
1087 | /* Don't attempt to use thread_db for remote targets. */ | |
856d6f99 | 1088 | if (!(target_can_run (¤t_target) || core_bfd)) |
17a37d48 PP |
1089 | return 0; |
1090 | ||
1091 | if (thread_db_load_search ()) | |
1092 | return 1; | |
1093 | ||
98a5dd13 DE |
1094 | /* We couldn't find a libthread_db. |
1095 | If the inferior has a libpthread warn the user. */ | |
1096 | if (has_libpthread ()) | |
1097 | { | |
1098 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1099 | " library, thread debugging will not be available.")); | |
1100 | return 0; | |
17a37d48 | 1101 | } |
98a5dd13 | 1102 | |
17a37d48 PP |
1103 | /* Either this executable isn't using libpthread at all, or it is |
1104 | statically linked. Since we can't easily distinguish these two cases, | |
1105 | no warning is issued. */ | |
1106 | return 0; | |
1107 | } | |
1108 | ||
fb0e1ba7 | 1109 | static void |
12b6a110 | 1110 | disable_thread_event_reporting (struct thread_db_info *info) |
fb0e1ba7 | 1111 | { |
21e1bee4 | 1112 | if (info->td_ta_clear_event_p != NULL) |
12b6a110 PP |
1113 | { |
1114 | td_thr_events_t events; | |
fb0e1ba7 | 1115 | |
12b6a110 PP |
1116 | /* Set the process wide mask saying we aren't interested in any |
1117 | events anymore. */ | |
21e1bee4 PP |
1118 | td_event_fillset (&events); |
1119 | info->td_ta_clear_event_p (info->thread_agent, &events); | |
12b6a110 | 1120 | } |
fb0e1ba7 | 1121 | |
d90e17a7 PA |
1122 | info->td_create_bp_addr = 0; |
1123 | info->td_death_bp_addr = 0; | |
fb0e1ba7 MK |
1124 | } |
1125 | ||
1126 | static void | |
1127 | check_thread_signals (void) | |
1128 | { | |
21bf60fe | 1129 | if (!thread_signals) |
fb0e1ba7 MK |
1130 | { |
1131 | sigset_t mask; | |
1132 | int i; | |
1133 | ||
669211f5 | 1134 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1135 | sigemptyset (&thread_stop_set); |
1136 | sigemptyset (&thread_print_set); | |
1137 | ||
b9569773 | 1138 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1139 | { |
1140 | if (sigismember (&mask, i)) | |
1141 | { | |
2ea28649 | 1142 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 1143 | sigaddset (&thread_stop_set, i); |
2ea28649 | 1144 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
1145 | sigaddset (&thread_print_set, i); |
1146 | thread_signals = 1; | |
1147 | } | |
1148 | } | |
1149 | } | |
fb0e1ba7 MK |
1150 | } |
1151 | ||
0ec9a092 DJ |
1152 | /* Check whether thread_db is usable. This function is called when |
1153 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1154 | and when new shared libraries are loaded into a running process. */ | |
1155 | ||
1156 | void | |
1157 | check_for_thread_db (void) | |
fb0e1ba7 | 1158 | { |
b5057acd | 1159 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1160 | if (!thread_db_load ()) |
b5057acd | 1161 | return; |
0ec9a092 DJ |
1162 | } |
1163 | ||
0838fb57 DE |
1164 | /* This function is called via the new_objfile observer. */ |
1165 | ||
0ec9a092 DJ |
1166 | static void |
1167 | thread_db_new_objfile (struct objfile *objfile) | |
1168 | { | |
d90e17a7 PA |
1169 | /* This observer must always be called with inferior_ptid set |
1170 | correctly. */ | |
1171 | ||
0838fb57 | 1172 | if (objfile != NULL |
fcb44371 | 1173 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 1174 | loaded (and notified without successful thread_db initialization) |
fcb44371 JK |
1175 | the time observer_notify_new_objfile is called for the library itself. |
1176 | Static executables have their separate debug info loaded already | |
1177 | before the inferior has started. */ | |
1178 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1179 | /* Only check for thread_db if we loaded libpthread, |
1180 | or if this is the main symbol file. | |
1181 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1182 | a statically linked executable AND the symbol file is specified AFTER | |
1183 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1184 | For dynamically linked executables, libpthread can be near the end | |
1185 | of the list of shared libraries to load, and in an app of several | |
1186 | thousand shared libraries, this can otherwise be painful. */ | |
1187 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 1188 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 1189 | check_for_thread_db (); |
fb0e1ba7 MK |
1190 | } |
1191 | ||
015de688 DC |
1192 | static void |
1193 | check_pid_namespace_match (void) | |
1194 | { | |
1195 | /* Check is only relevant for local targets targets. */ | |
1196 | if (target_can_run (¤t_target)) | |
1197 | { | |
1198 | /* If the child is in a different PID namespace, its idea of its | |
1199 | PID will differ from our idea of its PID. When we scan the | |
1200 | child's thread list, we'll mistakenly think it has no threads | |
1201 | since the thread PID fields won't match the PID we give to | |
1202 | libthread_db. */ | |
1203 | char *our_pid_ns = linux_proc_pid_get_ns (getpid (), "pid"); | |
1204 | char *inferior_pid_ns = linux_proc_pid_get_ns ( | |
1205 | ptid_get_pid (inferior_ptid), "pid"); | |
1206 | ||
1207 | if (our_pid_ns != NULL && inferior_pid_ns != NULL | |
1208 | && strcmp (our_pid_ns, inferior_pid_ns) != 0) | |
1209 | { | |
1210 | warning (_ ("Target and debugger are in different PID " | |
1211 | "namespaces; thread lists and other data are " | |
1212 | "likely unreliable")); | |
1213 | } | |
1214 | ||
1215 | xfree (our_pid_ns); | |
1216 | xfree (inferior_pid_ns); | |
1217 | } | |
1218 | } | |
1219 | ||
0838fb57 DE |
1220 | /* This function is called via the inferior_created observer. |
1221 | This handles the case of debugging statically linked executables. */ | |
1222 | ||
1223 | static void | |
1224 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1225 | { | |
015de688 | 1226 | check_pid_namespace_match (); |
0838fb57 DE |
1227 | check_for_thread_db (); |
1228 | } | |
1229 | ||
c1a747c1 PA |
1230 | /* Update the thread's state (what's displayed in "info threads"), |
1231 | from libthread_db thread state information. */ | |
1232 | ||
1233 | static void | |
fe978cb0 | 1234 | update_thread_state (struct private_thread_info *priv, |
c1a747c1 PA |
1235 | const td_thrinfo_t *ti_p) |
1236 | { | |
fe978cb0 PA |
1237 | priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN |
1238 | || ti_p->ti_state == TD_THR_ZOMBIE); | |
c1a747c1 PA |
1239 | } |
1240 | ||
a2f23071 DJ |
1241 | /* Attach to a new thread. This function is called when we receive a |
1242 | TD_CREATE event or when we iterate over all threads and find one | |
02c6c942 | 1243 | that wasn't already in our list. Returns true on success. */ |
a2f23071 | 1244 | |
02c6c942 | 1245 | static int |
39f77062 | 1246 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 1247 | const td_thrinfo_t *ti_p) |
fb0e1ba7 | 1248 | { |
2a2ef594 | 1249 | struct thread_info *tp; |
d90e17a7 | 1250 | struct thread_db_info *info; |
fb0e1ba7 | 1251 | |
a2f23071 DJ |
1252 | /* If we're being called after a TD_CREATE event, we may already |
1253 | know about this thread. There are two ways this can happen. We | |
1254 | may have iterated over all threads between the thread creation | |
1255 | and the TD_CREATE event, for instance when the user has issued | |
1256 | the `info threads' command before the SIGTRAP for hitting the | |
1257 | thread creation breakpoint was reported. Alternatively, the | |
1258 | thread may have exited and a new one been created with the same | |
1259 | thread ID. In the first case we don't need to do anything; in | |
1260 | the second case we should discard information about the dead | |
1261 | thread and attach to the new one. */ | |
2a2ef594 PA |
1262 | tp = find_thread_ptid (ptid); |
1263 | if (tp != NULL) | |
a2f23071 | 1264 | { |
fe978cb0 | 1265 | /* If tp->priv is NULL, then GDB is already attached to this |
17faa917 DJ |
1266 | thread, but we do not know anything about it. We can learn |
1267 | about it here. This can only happen if we have some other | |
1268 | way besides libthread_db to notice new threads (i.e. | |
1269 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread | |
1270 | exit, so this can not be a stale thread recreated with the | |
1271 | same ID. */ | |
fe978cb0 | 1272 | if (tp->priv != NULL) |
17faa917 | 1273 | { |
fe978cb0 | 1274 | if (!tp->priv->dying) |
02c6c942 | 1275 | return 0; |
a2f23071 | 1276 | |
17faa917 DJ |
1277 | delete_thread (ptid); |
1278 | tp = NULL; | |
1279 | } | |
a2f23071 DJ |
1280 | } |
1281 | ||
9ee57c33 | 1282 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
856d6f99 | 1283 | if (target_has_execution |
84636d28 PA |
1284 | && tp == NULL) |
1285 | { | |
1286 | int res; | |
1287 | ||
dfd4cc63 LM |
1288 | res = lin_lwp_attach_lwp (ptid_build (ptid_get_pid (ptid), |
1289 | ti_p->ti_lid, 0)); | |
84636d28 PA |
1290 | if (res < 0) |
1291 | { | |
1292 | /* Error, stop iterating. */ | |
1293 | return 0; | |
1294 | } | |
1295 | else if (res > 0) | |
1296 | { | |
1297 | /* Pretend this thread doesn't exist yet, and keep | |
1298 | iterating. */ | |
1299 | return 1; | |
1300 | } | |
1301 | ||
1302 | /* Otherwise, we sucessfully attached to the thread. */ | |
1303 | } | |
9ee57c33 | 1304 | |
2db9a427 PA |
1305 | info = get_thread_db_info (ptid_get_pid (ptid)); |
1306 | record_thread (info, tp, ptid, th_p, ti_p); | |
1307 | return 1; | |
1308 | } | |
1309 | ||
1310 | /* Record a new thread in GDB's thread list. Creates the thread's | |
1311 | private info. If TP is NULL, creates a new thread. Otherwise, | |
1312 | uses TP. */ | |
1313 | ||
1314 | static void | |
1315 | record_thread (struct thread_db_info *info, | |
1316 | struct thread_info *tp, | |
1317 | ptid_t ptid, const td_thrhandle_t *th_p, | |
1318 | const td_thrinfo_t *ti_p) | |
1319 | { | |
1320 | td_err_e err; | |
fe978cb0 | 1321 | struct private_thread_info *priv; |
2db9a427 PA |
1322 | int new_thread = (tp == NULL); |
1323 | ||
1324 | /* A thread ID of zero may mean the thread library has not | |
1325 | initialized yet. Leave private == NULL until the thread library | |
1326 | has initialized. */ | |
1327 | if (ti_p->ti_tid == 0) | |
1328 | return; | |
1329 | ||
17faa917 | 1330 | /* Construct the thread's private data. */ |
fe978cb0 PA |
1331 | priv = xmalloc (sizeof (struct private_thread_info)); |
1332 | memset (priv, 0, sizeof (struct private_thread_info)); | |
17faa917 | 1333 | |
fe978cb0 PA |
1334 | priv->th = *th_p; |
1335 | priv->tid = ti_p->ti_tid; | |
1336 | update_thread_state (priv, ti_p); | |
17faa917 | 1337 | |
4eec2deb PA |
1338 | /* Add the thread to GDB's thread list. If we already know about a |
1339 | thread with this PTID, but it's marked exited, then the kernel | |
1340 | reused the tid of an old thread. */ | |
1341 | if (tp == NULL || tp->state == THREAD_EXITED) | |
fe978cb0 | 1342 | tp = add_thread_with_info (ptid, priv); |
17faa917 | 1343 | else |
fe978cb0 | 1344 | tp->priv = priv; |
5365276c | 1345 | |
856d6f99 PA |
1346 | /* Enable thread event reporting for this thread, except when |
1347 | debugging a core file. */ | |
2db9a427 | 1348 | if (target_has_execution && thread_db_use_events () && new_thread) |
856d6f99 PA |
1349 | { |
1350 | err = info->td_thr_event_enable_p (th_p, 1); | |
1351 | if (err != TD_OK) | |
1352 | error (_("Cannot enable thread event reporting for %s: %s"), | |
1353 | target_pid_to_str (ptid), thread_db_err_str (err)); | |
1354 | } | |
1355 | ||
2db9a427 PA |
1356 | if (target_has_execution) |
1357 | check_thread_signals (); | |
fb0e1ba7 MK |
1358 | } |
1359 | ||
1360 | static void | |
17faa917 | 1361 | detach_thread (ptid_t ptid) |
fb0e1ba7 | 1362 | { |
a2f23071 DJ |
1363 | struct thread_info *thread_info; |
1364 | ||
a2f23071 DJ |
1365 | /* Don't delete the thread now, because it still reports as active |
1366 | until it has executed a few instructions after the event | |
1367 | breakpoint - if we deleted it now, "info threads" would cause us | |
1368 | to re-attach to it. Just mark it as having had a TD_DEATH | |
1369 | event. This means that we won't delete it from our thread list | |
1370 | until we notice that it's dead (via prune_threads), or until | |
17faa917 DJ |
1371 | something re-uses its thread ID. We'll report the thread exit |
1372 | when the underlying LWP dies. */ | |
e09875d4 | 1373 | thread_info = find_thread_ptid (ptid); |
fe978cb0 PA |
1374 | gdb_assert (thread_info != NULL && thread_info->priv != NULL); |
1375 | thread_info->priv->dying = 1; | |
fb0e1ba7 MK |
1376 | } |
1377 | ||
1378 | static void | |
52554a0e | 1379 | thread_db_detach (struct target_ops *ops, const char *args, int from_tty) |
fb0e1ba7 | 1380 | { |
117de6a9 | 1381 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1382 | struct thread_db_info *info; |
117de6a9 | 1383 | |
dfd4cc63 | 1384 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
c194fbe1 | 1385 | |
d90e17a7 PA |
1386 | if (info) |
1387 | { | |
c1a747c1 | 1388 | if (target_has_execution && thread_db_use_events ()) |
856d6f99 PA |
1389 | { |
1390 | disable_thread_event_reporting (info); | |
1391 | ||
1392 | /* Delete the old thread event breakpoints. Note that | |
1393 | unlike when mourning, we can remove them here because | |
1394 | there's still a live inferior to poke at. In any case, | |
1395 | GDB will not try to insert anything in the inferior when | |
1396 | removing a breakpoint. */ | |
1397 | remove_thread_event_breakpoints (); | |
1398 | } | |
d90e17a7 | 1399 | |
dfd4cc63 | 1400 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 | 1401 | } |
4105de34 | 1402 | |
7a7d3353 | 1403 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1404 | |
1405 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1406 | ||
1407 | /* If there are no more processes using libpthread, detach the | |
1408 | thread_db target ops. */ | |
1409 | if (!thread_db_list) | |
1410 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1411 | } |
1412 | ||
fb0e1ba7 MK |
1413 | /* Check if PID is currently stopped at the location of a thread event |
1414 | breakpoint location. If it is, read the event message and act upon | |
1415 | the event. */ | |
1416 | ||
1417 | static void | |
39f77062 | 1418 | check_event (ptid_t ptid) |
fb0e1ba7 | 1419 | { |
515630c5 UW |
1420 | struct regcache *regcache = get_thread_regcache (ptid); |
1421 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
fb0e1ba7 MK |
1422 | td_event_msg_t msg; |
1423 | td_thrinfo_t ti; | |
1424 | td_err_e err; | |
1425 | CORE_ADDR stop_pc; | |
4d9850d3 | 1426 | int loop = 0; |
d90e17a7 PA |
1427 | struct thread_db_info *info; |
1428 | ||
dfd4cc63 | 1429 | info = get_thread_db_info (ptid_get_pid (ptid)); |
fb0e1ba7 MK |
1430 | |
1431 | /* Bail out early if we're not at a thread event breakpoint. */ | |
faf09f01 PA |
1432 | stop_pc = regcache_read_pc (regcache); |
1433 | if (!target_supports_stopped_by_sw_breakpoint ()) | |
527a273a | 1434 | stop_pc -= gdbarch_decr_pc_after_break (gdbarch); |
faf09f01 | 1435 | |
d90e17a7 PA |
1436 | if (stop_pc != info->td_create_bp_addr |
1437 | && stop_pc != info->td_death_bp_addr) | |
fb0e1ba7 MK |
1438 | return; |
1439 | ||
4c28f408 | 1440 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1441 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
1442 | |
1443 | /* If we have only looked at the first thread before libpthread was | |
1444 | initialized, we may not know its thread ID yet. Make sure we do | |
1445 | before we add another thread to the list. */ | |
d90e17a7 PA |
1446 | if (!have_threads (ptid)) |
1447 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 1448 | |
4d9850d3 JJ |
1449 | /* If we are at a create breakpoint, we do not know what new lwp |
1450 | was created and cannot specifically locate the event message for it. | |
1451 | We have to call td_ta_event_getmsg() to get | |
1452 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 1453 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 1454 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
1455 | This guarantees we will process the correct message before continuing |
1456 | from the breakpoint. | |
4d9850d3 JJ |
1457 | |
1458 | Currently, death events are not enabled. If they are enabled, | |
1459 | the death event can use the td_thr_event_getmsg() interface to | |
1460 | get the message specifically for that lwp and avoid looping | |
1461 | below. */ | |
1462 | ||
1463 | loop = 1; | |
1464 | ||
1465 | do | |
fb0e1ba7 | 1466 | { |
d90e17a7 | 1467 | err = info->td_ta_event_getmsg_p (info->thread_agent, &msg); |
4d9850d3 JJ |
1468 | if (err != TD_OK) |
1469 | { | |
1470 | if (err == TD_NOMSG) | |
1471 | return; | |
fb0e1ba7 | 1472 | |
8a3fe4f8 | 1473 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
1474 | thread_db_err_str (err)); |
1475 | } | |
fb0e1ba7 | 1476 | |
d90e17a7 | 1477 | err = info->td_thr_get_info_p (msg.th_p, &ti); |
4d9850d3 | 1478 | if (err != TD_OK) |
8a3fe4f8 | 1479 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 1480 | |
dfd4cc63 | 1481 | ptid = ptid_build (ptid_get_pid (ptid), ti.ti_lid, 0); |
fb0e1ba7 | 1482 | |
4d9850d3 JJ |
1483 | switch (msg.event) |
1484 | { | |
1485 | case TD_CREATE: | |
a2f23071 DJ |
1486 | /* Call attach_thread whether or not we already know about a |
1487 | thread with this thread ID. */ | |
93815fbf | 1488 | attach_thread (ptid, msg.th_p, &ti); |
fb0e1ba7 | 1489 | |
4d9850d3 | 1490 | break; |
fb0e1ba7 | 1491 | |
4d9850d3 | 1492 | case TD_DEATH: |
fb0e1ba7 | 1493 | |
4d9850d3 | 1494 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 1495 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 1496 | |
17faa917 | 1497 | detach_thread (ptid); |
fb0e1ba7 | 1498 | |
4d9850d3 | 1499 | break; |
fb0e1ba7 | 1500 | |
4d9850d3 | 1501 | default: |
8a3fe4f8 | 1502 | error (_("Spurious thread event.")); |
4d9850d3 | 1503 | } |
fb0e1ba7 | 1504 | } |
4d9850d3 | 1505 | while (loop); |
fb0e1ba7 MK |
1506 | } |
1507 | ||
39f77062 | 1508 | static ptid_t |
117de6a9 | 1509 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1510 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1511 | int options) | |
fb0e1ba7 | 1512 | { |
d90e17a7 | 1513 | struct thread_db_info *info; |
117de6a9 PA |
1514 | struct target_ops *beneath = find_target_beneath (ops); |
1515 | ||
47608cb1 | 1516 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1517 | |
b84876c2 PA |
1518 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1519 | return ptid; | |
1520 | ||
1111f4aa | 1521 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1522 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1523 | return ptid; | |
fb0e1ba7 | 1524 | |
dfd4cc63 | 1525 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1526 | |
1527 | /* If this process isn't using thread_db, we're done. */ | |
1528 | if (info == NULL) | |
1529 | return ptid; | |
1530 | ||
3f64f7b1 DJ |
1531 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1532 | { | |
d90e17a7 PA |
1533 | /* New image, it may or may not end up using thread_db. Assume |
1534 | not unless we find otherwise. */ | |
dfd4cc63 | 1535 | delete_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1536 | if (!thread_db_list) |
1537 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1538 | |
6c95b8df PA |
1539 | /* Thread event breakpoints are deleted by |
1540 | update_breakpoints_after_exec. */ | |
1541 | ||
49fd4a42 | 1542 | return ptid; |
3f64f7b1 DJ |
1543 | } |
1544 | ||
fb0e1ba7 | 1545 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
a493e3e2 | 1546 | && ourstatus->value.sig == GDB_SIGNAL_TRAP) |
fb0e1ba7 | 1547 | /* Check for a thread event. */ |
39f77062 | 1548 | check_event (ptid); |
fb0e1ba7 | 1549 | |
2db9a427 PA |
1550 | /* Fill in the thread's user-level thread id and status. */ |
1551 | thread_from_lwp (ptid); | |
fb0e1ba7 | 1552 | |
b9b5d7ea | 1553 | return ptid; |
fb0e1ba7 MK |
1554 | } |
1555 | ||
fb0e1ba7 | 1556 | static void |
136d6dae | 1557 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1558 | { |
117de6a9 PA |
1559 | struct target_ops *target_beneath = find_target_beneath (ops); |
1560 | ||
dfd4cc63 | 1561 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 | 1562 | |
d90e17a7 PA |
1563 | target_beneath->to_mourn_inferior (target_beneath); |
1564 | ||
6c95b8df PA |
1565 | /* Delete the old thread event breakpoints. Do this after mourning |
1566 | the inferior, so that we don't try to uninsert them. */ | |
1567 | remove_thread_event_breakpoints (); | |
1568 | ||
b26a6851 | 1569 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1570 | if (!thread_db_list) |
1571 | unpush_target (ops); | |
fb0e1ba7 MK |
1572 | } |
1573 | ||
02c6c942 PP |
1574 | struct callback_data |
1575 | { | |
1576 | struct thread_db_info *info; | |
1577 | int new_threads; | |
1578 | }; | |
1579 | ||
fb0e1ba7 MK |
1580 | static int |
1581 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1582 | { | |
1583 | td_thrinfo_t ti; | |
1584 | td_err_e err; | |
39f77062 | 1585 | ptid_t ptid; |
403fe197 | 1586 | struct thread_info *tp; |
02c6c942 PP |
1587 | struct callback_data *cb_data = data; |
1588 | struct thread_db_info *info = cb_data->info; | |
fb0e1ba7 | 1589 | |
d90e17a7 | 1590 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1591 | if (err != TD_OK) |
8a3fe4f8 | 1592 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1593 | thread_db_err_str (err)); |
fb0e1ba7 | 1594 | |
a33e3959 PA |
1595 | if (ti.ti_lid == -1) |
1596 | { | |
1597 | /* A thread with kernel thread ID -1 is either a thread that | |
1598 | exited and was joined, or a thread that is being created but | |
1599 | hasn't started yet, and that is reusing the tcb/stack of a | |
1600 | thread that previously exited and was joined. (glibc marks | |
1601 | terminated and joined threads with kernel thread ID -1. See | |
1602 | glibc PR17707. */ | |
d6c146e9 PA |
1603 | if (libthread_db_debug) |
1604 | fprintf_unfiltered (gdb_stdlog, | |
1605 | "thread_db: skipping exited and " | |
1606 | "joined thread (0x%lx)\n", ti.ti_tid); | |
a33e3959 PA |
1607 | return 0; |
1608 | } | |
1609 | ||
254f582e | 1610 | if (ti.ti_tid == 0) |
4105de34 DJ |
1611 | { |
1612 | /* A thread ID of zero means that this is the main thread, but | |
1613 | glibc has not yet initialized thread-local storage and the | |
1614 | pthread library. We do not know what the thread's TID will | |
1615 | be yet. Just enable event reporting and otherwise ignore | |
1616 | it. */ | |
1617 | ||
4d062f1a PA |
1618 | /* In that case, we're not stopped in a fork syscall and don't |
1619 | need this glibc bug workaround. */ | |
1620 | info->need_stale_parent_threads_check = 0; | |
1621 | ||
c1a747c1 | 1622 | if (target_has_execution && thread_db_use_events ()) |
254f582e JK |
1623 | { |
1624 | err = info->td_thr_event_enable_p (th_p, 1); | |
1625 | if (err != TD_OK) | |
1626 | error (_("Cannot enable thread event reporting for LWP %d: %s"), | |
1627 | (int) ti.ti_lid, thread_db_err_str (err)); | |
1628 | } | |
4105de34 DJ |
1629 | |
1630 | return 0; | |
1631 | } | |
1632 | ||
4d062f1a PA |
1633 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1634 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1635 | avoid doing the work if we know we don't have to. */ | |
1636 | if (info->need_stale_parent_threads_check) | |
1637 | { | |
1638 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1639 | |
4d062f1a PA |
1640 | if (tgid != -1 && tgid != info->pid) |
1641 | return 0; | |
1642 | } | |
1643 | ||
1644 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1645 | tp = find_thread_ptid (ptid); |
fe978cb0 | 1646 | if (tp == NULL || tp->priv == NULL) |
02c6c942 PP |
1647 | { |
1648 | if (attach_thread (ptid, th_p, &ti)) | |
1649 | cb_data->new_threads += 1; | |
1650 | else | |
1651 | /* Problem attaching this thread; perhaps it exited before we | |
1652 | could attach it? | |
1653 | This could mean that the thread list inside glibc itself is in | |
1654 | inconsistent state, and libthread_db could go on looping forever | |
1655 | (observed with glibc-2.3.6). To prevent that, terminate | |
1656 | iteration: thread_db_find_new_threads_2 will retry. */ | |
1657 | return 1; | |
1658 | } | |
c1a747c1 PA |
1659 | else if (target_has_execution && !thread_db_use_events ()) |
1660 | { | |
1661 | /* Need to update this if not using the libthread_db events | |
1662 | (particularly, the TD_DEATH event). */ | |
fe978cb0 | 1663 | update_thread_state (tp->priv, &ti); |
c1a747c1 | 1664 | } |
fb0e1ba7 MK |
1665 | |
1666 | return 0; | |
1667 | } | |
1668 | ||
02c6c942 PP |
1669 | /* Helper for thread_db_find_new_threads_2. |
1670 | Returns number of new threads found. */ | |
1671 | ||
1672 | static int | |
1673 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1674 | td_err_e *errp) |
02c6c942 | 1675 | { |
02c6c942 | 1676 | struct callback_data data; |
fb169834 | 1677 | td_err_e err = TD_ERR; |
02c6c942 PP |
1678 | |
1679 | data.info = info; | |
1680 | data.new_threads = 0; | |
1681 | ||
2db9a427 PA |
1682 | /* See comment in thread_db_update_thread_list. */ |
1683 | gdb_assert (!target_has_execution || thread_db_use_events ()); | |
1684 | ||
492d29ea | 1685 | TRY |
02c6c942 PP |
1686 | { |
1687 | /* Iterate over all user-space threads to discover new threads. */ | |
1688 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1689 | find_new_threads_callback, | |
1690 | &data, | |
1691 | TD_THR_ANY_STATE, | |
1692 | TD_THR_LOWEST_PRIORITY, | |
1693 | TD_SIGNO_MASK, | |
1694 | TD_THR_ANY_USER_FLAGS); | |
1695 | } | |
6c63c96a | 1696 | CATCH (except, RETURN_MASK_ERROR) |
02c6c942 | 1697 | { |
6c63c96a | 1698 | if (libthread_db_debug) |
492d29ea PA |
1699 | { |
1700 | exception_fprintf (gdb_stdlog, except, | |
1701 | "Warning: find_new_threads_once: "); | |
1702 | } | |
6c63c96a PA |
1703 | } |
1704 | END_CATCH | |
02c6c942 | 1705 | |
6c63c96a PA |
1706 | if (libthread_db_debug) |
1707 | { | |
883ed13e PA |
1708 | fprintf_unfiltered (gdb_stdlog, |
1709 | _("Found %d new threads in iteration %d.\n"), | |
1710 | data.new_threads, iteration); | |
02c6c942 PP |
1711 | } |
1712 | ||
1713 | if (errp != NULL) | |
1714 | *errp = err; | |
1715 | ||
1716 | return data.new_threads; | |
1717 | } | |
1718 | ||
4c28f408 | 1719 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1720 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1721 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1722 | |
fb0e1ba7 | 1723 | static void |
02c6c942 | 1724 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 | 1725 | { |
fcb44371 | 1726 | td_err_e err = TD_OK; |
d90e17a7 | 1727 | struct thread_db_info *info; |
02c6c942 | 1728 | int i, loop; |
4c28f408 | 1729 | |
dfd4cc63 | 1730 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1731 | |
4c28f408 | 1732 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1733 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1734 | |
1735 | if (until_no_new) | |
1736 | { | |
1737 | /* Require 4 successive iterations which do not find any new threads. | |
1738 | The 4 is a heuristic: there is an inherent race here, and I have | |
1739 | seen that 2 iterations in a row are not always sufficient to | |
1740 | "capture" all threads. */ | |
fcb44371 JK |
1741 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1742 | if (find_new_threads_once (info, i, &err) != 0) | |
1743 | { | |
1744 | /* Found some new threads. Restart the loop from beginning. */ | |
1745 | loop = -1; | |
1746 | } | |
02c6c942 PP |
1747 | } |
1748 | else | |
fcb44371 JK |
1749 | find_new_threads_once (info, 0, &err); |
1750 | ||
1751 | if (err != TD_OK) | |
1752 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1753 | } |
1754 | ||
02c6c942 PP |
1755 | static void |
1756 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1757 | { | |
1758 | thread_db_find_new_threads_2 (ptid, 0); | |
1759 | } | |
1760 | ||
dc146f7c VP |
1761 | static int |
1762 | update_thread_core (struct lwp_info *info, void *closure) | |
1763 | { | |
2e794194 | 1764 | info->core = linux_common_core_of_thread (info->ptid); |
dc146f7c VP |
1765 | return 0; |
1766 | } | |
02c6c942 | 1767 | |
2db9a427 PA |
1768 | /* Update the thread list using td_ta_thr_iter. */ |
1769 | ||
28439f5e | 1770 | static void |
2db9a427 | 1771 | thread_db_update_thread_list_td_ta_thr_iter (struct target_ops *ops) |
28439f5e | 1772 | { |
d90e17a7 | 1773 | struct thread_db_info *info; |
c65b3e0d | 1774 | struct inferior *inf; |
d90e17a7 | 1775 | |
e8032dde PA |
1776 | prune_threads (); |
1777 | ||
c65b3e0d PA |
1778 | ALL_INFERIORS (inf) |
1779 | { | |
1780 | struct thread_info *thread; | |
d90e17a7 | 1781 | |
c65b3e0d PA |
1782 | if (inf->pid == 0) |
1783 | continue; | |
d90e17a7 | 1784 | |
c65b3e0d PA |
1785 | info = get_thread_db_info (inf->pid); |
1786 | if (info == NULL) | |
1787 | continue; | |
1788 | ||
1789 | thread = any_live_thread_of_process (inf->pid); | |
1790 | if (thread == NULL || thread->executing) | |
1791 | continue; | |
1792 | ||
1793 | thread_db_find_new_threads_1 (thread->ptid); | |
1794 | } | |
2db9a427 PA |
1795 | } |
1796 | ||
1797 | /* Implement the to_update_thread_list target method for this | |
1798 | target. */ | |
1799 | ||
1800 | static void | |
1801 | thread_db_update_thread_list (struct target_ops *ops) | |
1802 | { | |
1803 | /* It's best to avoid td_ta_thr_iter if possible. That walks data | |
1804 | structures in the inferior's address space that may be corrupted, | |
1805 | or, if the target is running, the list may change while we walk | |
1806 | it. In the latter case, it's possible that a thread exits just | |
1807 | at the exact time that causes GDB to get stuck in an infinite | |
1808 | loop. To avoid pausing all threads whenever the core wants to | |
1809 | refresh the thread list, if the kernel supports clone events | |
1810 | (meaning we're always already attached to all LWPs), we use | |
1811 | thread_from_lwp immediately when we see an LWP stop. That uses | |
1812 | thread_db entry points that do not walk libpthread's thread list, | |
1813 | so should be safe, as well as more efficient. */ | |
1814 | if (target_has_execution && !thread_db_use_events ()) | |
1815 | ops->beneath->to_update_thread_list (ops->beneath); | |
1816 | else | |
1817 | thread_db_update_thread_list_td_ta_thr_iter (ops); | |
dc146f7c | 1818 | |
856d6f99 PA |
1819 | if (target_has_execution) |
1820 | iterate_over_lwps (minus_one_ptid /* iterate over all */, | |
1821 | update_thread_core, NULL); | |
28439f5e PA |
1822 | } |
1823 | ||
fb0e1ba7 | 1824 | static char * |
117de6a9 | 1825 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1826 | { |
e09875d4 | 1827 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1828 | struct target_ops *beneath; |
17faa917 | 1829 | |
fe978cb0 | 1830 | if (thread_info != NULL && thread_info->priv != NULL) |
fb0e1ba7 MK |
1831 | { |
1832 | static char buf[64]; | |
17faa917 | 1833 | thread_t tid; |
fb0e1ba7 | 1834 | |
fe978cb0 | 1835 | tid = thread_info->priv->tid; |
17faa917 | 1836 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
dfd4cc63 | 1837 | tid, ptid_get_lwp (ptid)); |
fb0e1ba7 MK |
1838 | |
1839 | return buf; | |
1840 | } | |
1841 | ||
117de6a9 | 1842 | beneath = find_target_beneath (ops); |
e75fdfca | 1843 | return beneath->to_pid_to_str (beneath, ptid); |
fb0e1ba7 MK |
1844 | } |
1845 | ||
28b17333 DJ |
1846 | /* Return a string describing the state of the thread specified by |
1847 | INFO. */ | |
1848 | ||
1849 | static char * | |
c15906d8 TT |
1850 | thread_db_extra_thread_info (struct target_ops *self, |
1851 | struct thread_info *info) | |
28b17333 | 1852 | { |
fe978cb0 | 1853 | if (info->priv == NULL) |
17faa917 DJ |
1854 | return NULL; |
1855 | ||
fe978cb0 | 1856 | if (info->priv->dying) |
28b17333 DJ |
1857 | return "Exiting"; |
1858 | ||
1859 | return NULL; | |
1860 | } | |
1861 | ||
b2756930 KB |
1862 | /* Get the address of the thread local variable in load module LM which |
1863 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1864 | |
1865 | static CORE_ADDR | |
117de6a9 PA |
1866 | thread_db_get_thread_local_address (struct target_ops *ops, |
1867 | ptid_t ptid, | |
b2756930 | 1868 | CORE_ADDR lm, |
b4acd559 | 1869 | CORE_ADDR offset) |
3f47be5c | 1870 | { |
17faa917 | 1871 | struct thread_info *thread_info; |
117de6a9 | 1872 | struct target_ops *beneath; |
17faa917 | 1873 | |
4105de34 | 1874 | /* If we have not discovered any threads yet, check now. */ |
d90e17a7 PA |
1875 | if (!have_threads (ptid)) |
1876 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1877 | |
17faa917 | 1878 | /* Find the matching thread. */ |
e09875d4 | 1879 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1880 | |
fe978cb0 | 1881 | if (thread_info != NULL && thread_info->priv != NULL) |
3f47be5c | 1882 | { |
3f47be5c | 1883 | td_err_e err; |
00f515da | 1884 | psaddr_t address; |
d90e17a7 PA |
1885 | struct thread_db_info *info; |
1886 | ||
dfd4cc63 | 1887 | info = get_thread_db_info (ptid_get_pid (ptid)); |
3f47be5c | 1888 | |
3f47be5c | 1889 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1890 | if (lm != 0) |
1891 | { | |
1892 | /* glibc doesn't provide the needed interface. */ | |
1893 | if (!info->td_thr_tls_get_addr_p) | |
1894 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1895 | _("No TLS library support")); | |
1896 | ||
1897 | /* Note the cast through uintptr_t: this interface only works if | |
1898 | a target address fits in a psaddr_t, which is a host pointer. | |
1899 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
fe978cb0 | 1900 | err = info->td_thr_tls_get_addr_p (&thread_info->priv->th, |
5876f503 JK |
1901 | (psaddr_t)(uintptr_t) lm, |
1902 | offset, &address); | |
1903 | } | |
1904 | else | |
1905 | { | |
1906 | /* If glibc doesn't provide the needed interface throw an error | |
1907 | that LM is zero - normally cases it should not be. */ | |
1908 | if (!info->td_thr_tlsbase_p) | |
1909 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1910 | _("TLS load module not found")); | |
1911 | ||
1912 | /* This code path handles the case of -static -pthread executables: | |
1913 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1914 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1915 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1916 | The constant number 1 depends on GNU __libc_setup_tls | |
1917 | initialization of l_tls_modid to 1. */ | |
fe978cb0 | 1918 | err = info->td_thr_tlsbase_p (&thread_info->priv->th, |
5876f503 JK |
1919 | 1, &address); |
1920 | address = (char *) address + offset; | |
1921 | } | |
3f47be5c EZ |
1922 | |
1923 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1924 | /* The memory hasn't been allocated, yet. */ | |
1925 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1926 | /* Now, if libthread_db provided the initialization image's |
1927 | address, we *could* try to build a non-lvalue value from | |
1928 | the initialization image. */ | |
109c3e39 AC |
1929 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1930 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1931 | #endif |
1932 | ||
1933 | /* Something else went wrong. */ | |
1934 | if (err != TD_OK) | |
109c3e39 AC |
1935 | throw_error (TLS_GENERIC_ERROR, |
1936 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1937 | |
1938 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1939 | /* Do proper sign extension for the target. */ |
1940 | gdb_assert (exec_bfd); | |
1941 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1942 | ? (CORE_ADDR) (intptr_t) address | |
1943 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1944 | } |
1945 | ||
117de6a9 | 1946 | beneath = find_target_beneath (ops); |
f0f9ff95 | 1947 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); |
3f47be5c EZ |
1948 | } |
1949 | ||
0ef643c8 JB |
1950 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
1951 | ||
1952 | static ptid_t | |
1e6b91a4 | 1953 | thread_db_get_ada_task_ptid (struct target_ops *self, long lwp, long thread) |
0ef643c8 | 1954 | { |
2db9a427 PA |
1955 | /* NPTL uses a 1:1 model, so the LWP id suffices. */ |
1956 | return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); | |
0ef643c8 JB |
1957 | } |
1958 | ||
4d062f1a PA |
1959 | static void |
1960 | thread_db_resume (struct target_ops *ops, | |
2ea28649 | 1961 | ptid_t ptid, int step, enum gdb_signal signo) |
4d062f1a PA |
1962 | { |
1963 | struct target_ops *beneath = find_target_beneath (ops); | |
1964 | struct thread_db_info *info; | |
1965 | ||
1966 | if (ptid_equal (ptid, minus_one_ptid)) | |
dfd4cc63 | 1967 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
4d062f1a | 1968 | else |
dfd4cc63 | 1969 | info = get_thread_db_info (ptid_get_pid (ptid)); |
4d062f1a PA |
1970 | |
1971 | /* This workaround is only needed for child fork lwps stopped in a | |
1972 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1973 | workaround can be disabled. */ | |
1974 | if (info) | |
1975 | info->need_stale_parent_threads_check = 0; | |
1976 | ||
1977 | beneath->to_resume (beneath, ptid, step, signo); | |
1978 | } | |
1979 | ||
bf88dd68 JK |
1980 | /* qsort helper function for info_auto_load_libthread_db, sort the |
1981 | thread_db_info pointers primarily by their FILENAME and secondarily by their | |
1982 | PID, both in ascending order. */ | |
1983 | ||
1984 | static int | |
1985 | info_auto_load_libthread_db_compare (const void *ap, const void *bp) | |
1986 | { | |
1987 | struct thread_db_info *a = *(struct thread_db_info **) ap; | |
1988 | struct thread_db_info *b = *(struct thread_db_info **) bp; | |
1989 | int retval; | |
1990 | ||
1991 | retval = strcmp (a->filename, b->filename); | |
1992 | if (retval) | |
1993 | return retval; | |
1994 | ||
1995 | return (a->pid > b->pid) - (a->pid - b->pid); | |
1996 | } | |
1997 | ||
1998 | /* Implement 'info auto-load libthread-db'. */ | |
1999 | ||
2000 | static void | |
2001 | info_auto_load_libthread_db (char *args, int from_tty) | |
2002 | { | |
2003 | struct ui_out *uiout = current_uiout; | |
2004 | const char *cs = args ? args : ""; | |
2005 | struct thread_db_info *info, **array; | |
2006 | unsigned info_count, unique_filenames; | |
2007 | size_t max_filename_len, max_pids_len, pids_len; | |
2008 | struct cleanup *back_to; | |
2009 | char *pids; | |
2010 | int i; | |
2011 | ||
529480d0 | 2012 | cs = skip_spaces_const (cs); |
bf88dd68 JK |
2013 | if (*cs) |
2014 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
2015 | ||
2016 | info_count = 0; | |
2017 | for (info = thread_db_list; info; info = info->next) | |
2018 | if (info->filename != NULL) | |
2019 | info_count++; | |
2020 | ||
2021 | array = xmalloc (sizeof (*array) * info_count); | |
2022 | back_to = make_cleanup (xfree, array); | |
2023 | ||
2024 | info_count = 0; | |
2025 | for (info = thread_db_list; info; info = info->next) | |
2026 | if (info->filename != NULL) | |
2027 | array[info_count++] = info; | |
2028 | ||
2029 | /* Sort ARRAY by filenames and PIDs. */ | |
2030 | ||
2031 | qsort (array, info_count, sizeof (*array), | |
2032 | info_auto_load_libthread_db_compare); | |
2033 | ||
2034 | /* Calculate the number of unique filenames (rows) and the maximum string | |
2035 | length of PIDs list for the unique filenames (columns). */ | |
2036 | ||
2037 | unique_filenames = 0; | |
2038 | max_filename_len = 0; | |
2039 | max_pids_len = 0; | |
2040 | pids_len = 0; | |
2041 | for (i = 0; i < info_count; i++) | |
2042 | { | |
2043 | int pid = array[i]->pid; | |
2044 | size_t this_pid_len; | |
2045 | ||
2046 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
2047 | this_pid_len++; | |
2048 | ||
2049 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
2050 | { | |
2051 | unique_filenames++; | |
2052 | max_filename_len = max (max_filename_len, | |
2053 | strlen (array[i]->filename)); | |
2054 | ||
2055 | if (i > 0) | |
2056 | { | |
2057 | pids_len -= strlen (", "); | |
2058 | max_pids_len = max (max_pids_len, pids_len); | |
2059 | } | |
2060 | pids_len = 0; | |
2061 | } | |
2062 | pids_len += this_pid_len + strlen (", "); | |
2063 | } | |
2064 | if (i) | |
2065 | { | |
2066 | pids_len -= strlen (", "); | |
2067 | max_pids_len = max (max_pids_len, pids_len); | |
2068 | } | |
2069 | ||
2070 | /* Table header shifted right by preceding "libthread-db: " would not match | |
2071 | its columns. */ | |
2072 | if (info_count > 0 && args == auto_load_info_scripts_pattern_nl) | |
2073 | ui_out_text (uiout, "\n"); | |
2074 | ||
2075 | make_cleanup_ui_out_table_begin_end (uiout, 2, unique_filenames, | |
2076 | "LinuxThreadDbTable"); | |
2077 | ||
2078 | ui_out_table_header (uiout, max_filename_len, ui_left, "filename", | |
2079 | "Filename"); | |
2080 | ui_out_table_header (uiout, pids_len, ui_left, "PIDs", "Pids"); | |
2081 | ui_out_table_body (uiout); | |
2082 | ||
2083 | pids = xmalloc (max_pids_len + 1); | |
2084 | make_cleanup (xfree, pids); | |
2085 | ||
2086 | /* Note I is incremented inside the cycle, not at its end. */ | |
2087 | for (i = 0; i < info_count;) | |
2088 | { | |
2089 | struct cleanup *chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); | |
2090 | char *pids_end; | |
2091 | ||
2092 | info = array[i]; | |
2093 | ui_out_field_string (uiout, "filename", info->filename); | |
2094 | pids_end = pids; | |
2095 | ||
2096 | while (i < info_count && strcmp (info->filename, array[i]->filename) == 0) | |
2097 | { | |
2098 | if (pids_end != pids) | |
2099 | { | |
2100 | *pids_end++ = ','; | |
2101 | *pids_end++ = ' '; | |
2102 | } | |
2103 | pids_end += xsnprintf (pids_end, &pids[max_pids_len + 1] - pids_end, | |
2104 | "%u", array[i]->pid); | |
2105 | gdb_assert (pids_end < &pids[max_pids_len + 1]); | |
2106 | ||
2107 | i++; | |
2108 | } | |
2109 | *pids_end = '\0'; | |
2110 | ||
2111 | ui_out_field_string (uiout, "pids", pids); | |
2112 | ||
2113 | ui_out_text (uiout, "\n"); | |
2114 | do_cleanups (chain); | |
2115 | } | |
2116 | ||
2117 | do_cleanups (back_to); | |
2118 | ||
2119 | if (info_count == 0) | |
2120 | ui_out_message (uiout, 0, _("No auto-loaded libthread-db.\n")); | |
2121 | } | |
2122 | ||
fb0e1ba7 MK |
2123 | static void |
2124 | init_thread_db_ops (void) | |
2125 | { | |
2126 | thread_db_ops.to_shortname = "multi-thread"; | |
2127 | thread_db_ops.to_longname = "multi-threaded child process."; | |
2128 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
2129 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 2130 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 2131 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 2132 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
e8032dde | 2133 | thread_db_ops.to_update_thread_list = thread_db_update_thread_list; |
fb0e1ba7 MK |
2134 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; |
2135 | thread_db_ops.to_stratum = thread_stratum; | |
2136 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
2137 | thread_db_ops.to_get_thread_local_address |
2138 | = thread_db_get_thread_local_address; | |
28b17333 | 2139 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 2140 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 | 2141 | thread_db_ops.to_magic = OPS_MAGIC; |
c22a2b88 TT |
2142 | |
2143 | complete_target_initialization (&thread_db_ops); | |
fb0e1ba7 MK |
2144 | } |
2145 | ||
2c0b251b PA |
2146 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
2147 | extern initialize_file_ftype _initialize_thread_db; | |
2148 | ||
fb0e1ba7 MK |
2149 | void |
2150 | _initialize_thread_db (void) | |
2151 | { | |
17a37d48 | 2152 | init_thread_db_ops (); |
17a37d48 PP |
2153 | |
2154 | /* Defer loading of libthread_db.so until inferior is running. | |
2155 | This allows gdb to load correct libthread_db for a given | |
2156 | executable -- there could be mutiple versions of glibc, | |
2157 | compiled with LinuxThreads or NPTL, and until there is | |
2158 | a running inferior, we can't tell which libthread_db is | |
1777feb0 | 2159 | the correct one to load. */ |
17a37d48 PP |
2160 | |
2161 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
2162 | ||
2163 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
2164 | class_support, | |
2165 | &libthread_db_search_path, _("\ | |
2166 | Set search path for libthread_db."), _("\ | |
2167 | Show the current search path or libthread_db."), _("\ | |
2168 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
2169 | gdb itself.\n\ |
2170 | Its value is a colon (':') separate list of directories to search.\n\ | |
2171 | Setting the search path to an empty list resets it to its default value."), | |
2172 | set_libthread_db_search_path, | |
17a37d48 PP |
2173 | NULL, |
2174 | &setlist, &showlist); | |
02d868e8 | 2175 | |
ccce17b0 YQ |
2176 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
2177 | &libthread_db_debug, _("\ | |
02d868e8 PP |
2178 | Set libthread-db debugging."), _("\ |
2179 | Show libthread-db debugging."), _("\ | |
2180 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
2181 | NULL, |
2182 | show_libthread_db_debug, | |
2183 | &setdebuglist, &showdebuglist); | |
02d868e8 | 2184 | |
bf88dd68 JK |
2185 | add_setshow_boolean_cmd ("libthread-db", class_support, |
2186 | &auto_load_thread_db, _("\ | |
2187 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
2188 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
2189 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
2190 | locations to load libthread_db compatible with the inferior.\n\ | |
2191 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
2192 | This options has security implications for untrusted inferiors."), | |
2193 | NULL, show_auto_load_thread_db, | |
2194 | auto_load_set_cmdlist_get (), | |
2195 | auto_load_show_cmdlist_get ()); | |
2196 | ||
2197 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
2198 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
2199 | Usage: info auto-load libthread-db"), | |
2200 | auto_load_info_cmdlist_get ()); | |
2201 | ||
17a37d48 PP |
2202 | /* Add ourselves to objfile event chain. */ |
2203 | observer_attach_new_objfile (thread_db_new_objfile); | |
0838fb57 DE |
2204 | |
2205 | /* Add ourselves to inferior_created event chain. | |
2206 | This is needed to handle debugging statically linked programs where | |
2207 | the new_objfile observer won't get called for libpthread. */ | |
2208 | observer_attach_inferior_created (thread_db_inferior_created); | |
fb0e1ba7 | 2209 | } |