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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_id2thr_p) (const td_thragent_t *ta, thread_t pt, |
182 | td_thrhandle_t *__th); | |
183 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, | |
184 | lwpid_t lwpid, td_thrhandle_t *th); | |
185 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
186 | td_thr_iter_f *callback, void *cbdata_p, | |
187 | td_thr_state_e state, int ti_pri, | |
188 | sigset_t *ti_sigmask_p, | |
189 | unsigned int ti_user_flags); | |
190 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
191 | td_event_e event, td_notify_t *ptr); | |
192 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
193 | td_thr_events_t *event); | |
21e1bee4 PP |
194 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
195 | td_thr_events_t *event); | |
d90e17a7 PA |
196 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
197 | td_event_msg_t *msg); | |
198 | ||
199 | td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); | |
200 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
201 | td_thrinfo_t *infop); | |
202 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, | |
203 | int event); | |
204 | ||
205 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
206 | psaddr_t map_address, |
207 | size_t offset, psaddr_t *address); | |
5876f503 JK |
208 | td_err_e (*td_thr_tlsbase_p) (const td_thrhandle_t *th, |
209 | unsigned long int modid, | |
210 | psaddr_t *base); | |
d90e17a7 PA |
211 | }; |
212 | ||
213 | /* List of known processes using thread_db, and the required | |
214 | bookkeeping. */ | |
215 | struct thread_db_info *thread_db_list; | |
216 | ||
217 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 218 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 | 219 | |
2db9a427 PA |
220 | static void check_thread_signals (void); |
221 | ||
222 | static void record_thread (struct thread_db_info *info, | |
223 | struct thread_info *tp, | |
224 | ptid_t ptid, const td_thrhandle_t *th_p, | |
225 | const td_thrinfo_t *ti_p); | |
226 | ||
d90e17a7 PA |
227 | /* Add the current inferior to the list of processes using libpthread. |
228 | Return a pointer to the newly allocated object that was added to | |
229 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
230 | LIBTHREAD_DB_SO. */ | |
231 | ||
232 | static struct thread_db_info * | |
233 | add_thread_db_info (void *handle) | |
234 | { | |
d90e17a7 PA |
235 | struct thread_db_info *info; |
236 | ||
237 | info = xcalloc (1, sizeof (*info)); | |
238 | info->pid = ptid_get_pid (inferior_ptid); | |
239 | info->handle = handle; | |
856d6f99 PA |
240 | |
241 | /* The workaround works by reading from /proc/pid/status, so it is | |
242 | disabled for core files. */ | |
243 | if (target_has_execution) | |
244 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
245 | |
246 | info->next = thread_db_list; | |
247 | thread_db_list = info; | |
248 | ||
249 | return info; | |
250 | } | |
251 | ||
252 | /* Return the thread_db_info object representing the bookkeeping | |
253 | related to process PID, if any; NULL otherwise. */ | |
254 | ||
255 | static struct thread_db_info * | |
256 | get_thread_db_info (int pid) | |
257 | { | |
258 | struct thread_db_info *info; | |
259 | ||
260 | for (info = thread_db_list; info; info = info->next) | |
261 | if (pid == info->pid) | |
262 | return info; | |
263 | ||
264 | return NULL; | |
265 | } | |
266 | ||
267 | /* When PID has exited or has been detached, we no longer want to keep | |
268 | track of it as using libpthread. Call this function to discard | |
269 | thread_db related info related to PID. Note that this closes | |
270 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
271 | ||
272 | static void | |
273 | delete_thread_db_info (int pid) | |
274 | { | |
275 | struct thread_db_info *info, *info_prev; | |
276 | ||
277 | info_prev = NULL; | |
278 | ||
279 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
280 | if (pid == info->pid) | |
281 | break; | |
282 | ||
283 | if (info == NULL) | |
284 | return; | |
285 | ||
286 | if (info->handle != NULL) | |
287 | dlclose (info->handle); | |
288 | ||
bf88dd68 JK |
289 | xfree (info->filename); |
290 | ||
d90e17a7 PA |
291 | if (info_prev) |
292 | info_prev->next = info->next; | |
293 | else | |
294 | thread_db_list = info->next; | |
295 | ||
296 | xfree (info); | |
297 | } | |
fb0e1ba7 MK |
298 | |
299 | /* Prototypes for local functions. */ | |
02c6c942 PP |
300 | static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
301 | const td_thrinfo_t *ti_p); | |
17faa917 | 302 | static void detach_thread (ptid_t ptid); |
fb0e1ba7 MK |
303 | \f |
304 | ||
5365276c DJ |
305 | /* Use "struct private_thread_info" to cache thread state. This is |
306 | a substantial optimization. */ | |
307 | ||
fb0e1ba7 MK |
308 | struct private_thread_info |
309 | { | |
a2f23071 DJ |
310 | /* Flag set when we see a TD_DEATH event for this thread. */ |
311 | unsigned int dying:1; | |
312 | ||
5365276c | 313 | /* Cached thread state. */ |
5365276c | 314 | td_thrhandle_t th; |
17faa917 | 315 | thread_t tid; |
fb0e1ba7 | 316 | }; |
fb0e1ba7 | 317 | \f |
21bf60fe | 318 | |
fb0e1ba7 MK |
319 | static char * |
320 | thread_db_err_str (td_err_e err) | |
321 | { | |
322 | static char buf[64]; | |
323 | ||
324 | switch (err) | |
325 | { | |
326 | case TD_OK: | |
327 | return "generic 'call succeeded'"; | |
328 | case TD_ERR: | |
329 | return "generic error"; | |
330 | case TD_NOTHR: | |
331 | return "no thread to satisfy query"; | |
332 | case TD_NOSV: | |
333 | return "no sync handle to satisfy query"; | |
334 | case TD_NOLWP: | |
335 | return "no LWP to satisfy query"; | |
336 | case TD_BADPH: | |
337 | return "invalid process handle"; | |
338 | case TD_BADTH: | |
339 | return "invalid thread handle"; | |
340 | case TD_BADSH: | |
341 | return "invalid synchronization handle"; | |
342 | case TD_BADTA: | |
343 | return "invalid thread agent"; | |
344 | case TD_BADKEY: | |
345 | return "invalid key"; | |
346 | case TD_NOMSG: | |
347 | return "no event message for getmsg"; | |
348 | case TD_NOFPREGS: | |
349 | return "FPU register set not available"; | |
350 | case TD_NOLIBTHREAD: | |
351 | return "application not linked with libthread"; | |
352 | case TD_NOEVENT: | |
353 | return "requested event is not supported"; | |
354 | case TD_NOCAPAB: | |
355 | return "capability not available"; | |
356 | case TD_DBERR: | |
357 | return "debugger service failed"; | |
358 | case TD_NOAPLIC: | |
359 | return "operation not applicable to"; | |
360 | case TD_NOTSD: | |
361 | return "no thread-specific data for this thread"; | |
362 | case TD_MALLOC: | |
363 | return "malloc failed"; | |
364 | case TD_PARTIALREG: | |
365 | return "only part of register set was written/read"; | |
366 | case TD_NOXREGS: | |
367 | return "X register set not available for this thread"; | |
59f80f10 DJ |
368 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
369 | case TD_NOTALLOC: | |
370 | return "thread has not yet allocated TLS for given module"; | |
371 | #endif | |
372 | #ifdef THREAD_DB_HAS_TD_VERSION | |
373 | case TD_VERSION: | |
374 | return "versions of libpthread and libthread_db do not match"; | |
375 | #endif | |
376 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
377 | case TD_NOTLS: | |
378 | return "there is no TLS segment in the given module"; | |
379 | #endif | |
fb0e1ba7 MK |
380 | default: |
381 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
382 | return buf; | |
383 | } | |
384 | } | |
fb0e1ba7 | 385 | \f |
4105de34 DJ |
386 | /* Return 1 if any threads have been registered. There may be none if |
387 | the threading library is not fully initialized yet. */ | |
388 | ||
389 | static int | |
d90e17a7 | 390 | have_threads_callback (struct thread_info *thread, void *args) |
4105de34 | 391 | { |
d90e17a7 | 392 | int pid = * (int *) args; |
e0881a8e | 393 | |
d90e17a7 PA |
394 | if (ptid_get_pid (thread->ptid) != pid) |
395 | return 0; | |
396 | ||
fe978cb0 | 397 | return thread->priv != NULL; |
4105de34 DJ |
398 | } |
399 | ||
400 | static int | |
d90e17a7 | 401 | have_threads (ptid_t ptid) |
4105de34 | 402 | { |
d90e17a7 PA |
403 | int pid = ptid_get_pid (ptid); |
404 | ||
405 | return iterate_over_threads (have_threads_callback, &pid) != NULL; | |
4105de34 DJ |
406 | } |
407 | ||
5365276c | 408 | \f |
64776a0b | 409 | /* Fetch the user-level thread id of PTID. */ |
fb0e1ba7 | 410 | |
64776a0b | 411 | static void |
39f77062 | 412 | thread_from_lwp (ptid_t ptid) |
fb0e1ba7 | 413 | { |
fb0e1ba7 | 414 | td_thrhandle_t th; |
2db9a427 | 415 | td_thrinfo_t ti; |
fb0e1ba7 | 416 | td_err_e err; |
d90e17a7 | 417 | struct thread_db_info *info; |
2db9a427 | 418 | struct thread_info *tp; |
fb0e1ba7 | 419 | |
6cb9b55b PP |
420 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
421 | th.th_unique = 0; | |
422 | ||
17faa917 DJ |
423 | /* This ptid comes from linux-nat.c, which should always fill in the |
424 | LWP. */ | |
dfd4cc63 | 425 | gdb_assert (ptid_get_lwp (ptid) != 0); |
fb0e1ba7 | 426 | |
dfd4cc63 | 427 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 428 | |
4c28f408 | 429 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 430 | info->proc_handle.ptid = ptid; |
dfd4cc63 LM |
431 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid), |
432 | &th); | |
fb0e1ba7 | 433 | if (err != TD_OK) |
8a3fe4f8 | 434 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
dfd4cc63 | 435 | ptid_get_lwp (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 436 | |
2db9a427 PA |
437 | err = info->td_thr_get_info_p (&th, &ti); |
438 | if (err != TD_OK) | |
439 | error (_("thread_get_info_callback: cannot get thread info: %s"), | |
440 | thread_db_err_str (err)); | |
441 | ||
442 | /* Fill the cache. */ | |
443 | tp = find_thread_ptid (ptid); | |
444 | record_thread (info, tp, ptid, &th, &ti); | |
fb0e1ba7 MK |
445 | } |
446 | \f | |
447 | ||
2db9a427 PA |
448 | /* See linux-nat.h. */ |
449 | ||
4c28f408 | 450 | int |
2db9a427 | 451 | thread_db_notice_clone (ptid_t parent, ptid_t child) |
4c28f408 PA |
452 | { |
453 | td_thrhandle_t th; | |
454 | td_thrinfo_t ti; | |
455 | td_err_e err; | |
d90e17a7 | 456 | struct thread_db_info *info; |
4c28f408 | 457 | |
2db9a427 | 458 | info = get_thread_db_info (ptid_get_pid (child)); |
d90e17a7 PA |
459 | |
460 | if (info == NULL) | |
4c28f408 PA |
461 | return 0; |
462 | ||
2db9a427 | 463 | thread_from_lwp (child); |
4c28f408 | 464 | |
2db9a427 PA |
465 | /* If we do not know about the main thread yet, this would be a good |
466 | time to find it. */ | |
467 | thread_from_lwp (parent); | |
4c28f408 PA |
468 | return 1; |
469 | } | |
470 | ||
5220ea4c AC |
471 | static void * |
472 | verbose_dlsym (void *handle, const char *name) | |
473 | { | |
474 | void *sym = dlsym (handle, name); | |
475 | if (sym == NULL) | |
3e43a32a MS |
476 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
477 | name, dlerror ()); | |
5220ea4c AC |
478 | return sym; |
479 | } | |
480 | ||
cdbc0b18 | 481 | static td_err_e |
d90e17a7 | 482 | enable_thread_event (int event, CORE_ADDR *bp) |
24557e30 AC |
483 | { |
484 | td_notify_t notify; | |
cdbc0b18 | 485 | td_err_e err; |
d90e17a7 PA |
486 | struct thread_db_info *info; |
487 | ||
dfd4cc63 | 488 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
24557e30 | 489 | |
4c28f408 | 490 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 491 | info->proc_handle.ptid = inferior_ptid; |
4c28f408 | 492 | |
24557e30 | 493 | /* Get the breakpoint address for thread EVENT. */ |
d90e17a7 | 494 | err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify); |
24557e30 | 495 | if (err != TD_OK) |
cdbc0b18 | 496 | return err; |
24557e30 AC |
497 | |
498 | /* Set up the breakpoint. */ | |
16451949 AS |
499 | gdb_assert (exec_bfd); |
500 | (*bp) = (gdbarch_convert_from_func_ptr_addr | |
f5656ead | 501 | (target_gdbarch (), |
16451949 AS |
502 | /* Do proper sign extension for the target. */ |
503 | (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
504 | ? (CORE_ADDR) (intptr_t) notify.u.bptaddr | |
505 | : (CORE_ADDR) (uintptr_t) notify.u.bptaddr), | |
506 | ¤t_target)); | |
f5656ead | 507 | create_thread_event_breakpoint (target_gdbarch (), *bp); |
24557e30 | 508 | |
cdbc0b18 | 509 | return TD_OK; |
24557e30 AC |
510 | } |
511 | ||
fcb44371 JK |
512 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
513 | return 1 if this version is lower (and not equal) to | |
514 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
515 | ||
516 | static int | |
517 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
518 | { | |
3b7344d5 | 519 | struct bound_minimal_symbol version_msym; |
fcb44371 JK |
520 | CORE_ADDR version_addr; |
521 | char *version; | |
522 | int err, got, retval = 0; | |
523 | ||
524 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 525 | if (version_msym.minsym == NULL) |
fcb44371 JK |
526 | return 0; |
527 | ||
77e371c0 | 528 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
fcb44371 JK |
529 | got = target_read_string (version_addr, &version, 32, &err); |
530 | if (err == 0 && memchr (version, 0, got) == &version[got -1]) | |
531 | { | |
532 | int major, minor; | |
533 | ||
534 | retval = (sscanf (version, "%d.%d", &major, &minor) == 2 | |
535 | && (major < ver_major_min | |
536 | || (major == ver_major_min && minor < ver_minor_min))); | |
537 | } | |
538 | xfree (version); | |
539 | ||
540 | return retval; | |
541 | } | |
542 | ||
fb0e1ba7 MK |
543 | static void |
544 | enable_thread_event_reporting (void) | |
545 | { | |
546 | td_thr_events_t events; | |
fb0e1ba7 | 547 | td_err_e err; |
d90e17a7 PA |
548 | struct thread_db_info *info; |
549 | ||
dfd4cc63 | 550 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 MK |
551 | |
552 | /* We cannot use the thread event reporting facility if these | |
553 | functions aren't available. */ | |
d90e17a7 PA |
554 | if (info->td_ta_event_addr_p == NULL |
555 | || info->td_ta_set_event_p == NULL | |
556 | || info->td_ta_event_getmsg_p == NULL | |
557 | || info->td_thr_event_enable_p == NULL) | |
fb0e1ba7 MK |
558 | return; |
559 | ||
560 | /* Set the process wide mask saying which events we're interested in. */ | |
561 | td_event_emptyset (&events); | |
562 | td_event_addset (&events, TD_CREATE); | |
a2f23071 | 563 | |
8775fd2d JK |
564 | /* There is a bug fixed between linuxthreads 2.1.3 and 2.2 by |
565 | commit 2e4581e4fba917f1779cd0a010a45698586c190a | |
566 | * manager.c (pthread_exited): Correctly report event as TD_REAP | |
567 | instead of TD_DEATH. Fix comments. | |
568 | where event reporting facility is broken for TD_DEATH events, | |
569 | so don't enable it if we have glibc but a lower version. */ | |
570 | if (!inferior_has_bug ("__linuxthreads_version", 2, 2)) | |
a2f23071 | 571 | td_event_addset (&events, TD_DEATH); |
fb0e1ba7 | 572 | |
d90e17a7 | 573 | err = info->td_ta_set_event_p (info->thread_agent, &events); |
fb0e1ba7 MK |
574 | if (err != TD_OK) |
575 | { | |
8a3fe4f8 | 576 | warning (_("Unable to set global thread event mask: %s"), |
fb0e1ba7 MK |
577 | thread_db_err_str (err)); |
578 | return; | |
579 | } | |
580 | ||
581 | /* Delete previous thread event breakpoints, if any. */ | |
582 | remove_thread_event_breakpoints (); | |
d90e17a7 PA |
583 | info->td_create_bp_addr = 0; |
584 | info->td_death_bp_addr = 0; | |
fb0e1ba7 | 585 | |
24557e30 | 586 | /* Set up the thread creation event. */ |
d90e17a7 | 587 | err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr); |
cdbc0b18 | 588 | if (err != TD_OK) |
fb0e1ba7 | 589 | { |
8a3fe4f8 | 590 | warning (_("Unable to get location for thread creation breakpoint: %s"), |
fb0e1ba7 MK |
591 | thread_db_err_str (err)); |
592 | return; | |
593 | } | |
594 | ||
24557e30 | 595 | /* Set up the thread death event. */ |
d90e17a7 | 596 | err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr); |
cdbc0b18 | 597 | if (err != TD_OK) |
fb0e1ba7 | 598 | { |
8a3fe4f8 | 599 | warning (_("Unable to get location for thread death breakpoint: %s"), |
fb0e1ba7 MK |
600 | thread_db_err_str (err)); |
601 | return; | |
602 | } | |
fb0e1ba7 MK |
603 | } |
604 | ||
fcb44371 JK |
605 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
606 | if appropriate. | |
456b0e24 | 607 | |
fcb44371 JK |
608 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
609 | otherwise. */ | |
610 | ||
611 | static int | |
456b0e24 PP |
612 | thread_db_find_new_threads_silently (ptid_t ptid) |
613 | { | |
614 | volatile struct gdb_exception except; | |
615 | ||
616 | TRY_CATCH (except, RETURN_MASK_ERROR) | |
617 | { | |
02c6c942 | 618 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
619 | } |
620 | ||
fcb44371 | 621 | if (except.reason < 0) |
e0881a8e | 622 | { |
fcb44371 | 623 | if (libthread_db_debug) |
883ed13e | 624 | exception_fprintf (gdb_stdlog, except, |
fcb44371 JK |
625 | "Warning: thread_db_find_new_threads_silently: "); |
626 | ||
627 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
628 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
629 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
630 | executables if td_thr_get_info is called before glibc has initialized | |
631 | itself. | |
632 | ||
633 | If the nptl bug is NOT present in the inferior and still thread_db | |
634 | reports an error return 1. It means the inferior has corrupted thread | |
635 | list and GDB should fall back only to LWPs. | |
636 | ||
637 | If the nptl bug is present in the inferior return 0 to silently ignore | |
638 | such errors, and let gdb enumerate threads again later. In such case | |
639 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
640 | corrupted. For core files it does not apply, no 'later enumeration' |
641 | is possible. */ | |
fcb44371 | 642 | |
889003ed | 643 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
644 | { |
645 | exception_fprintf (gdb_stderr, except, | |
646 | _("Warning: couldn't activate thread debugging " | |
647 | "using libthread_db: ")); | |
648 | return 1; | |
649 | } | |
e0881a8e | 650 | } |
fcb44371 | 651 | return 0; |
456b0e24 PP |
652 | } |
653 | ||
d90e17a7 PA |
654 | /* Lookup a library in which given symbol resides. |
655 | Note: this is looking in GDB process, not in the inferior. | |
656 | Returns library name, or NULL. */ | |
657 | ||
658 | static const char * | |
659 | dladdr_to_soname (const void *addr) | |
660 | { | |
661 | Dl_info info; | |
662 | ||
663 | if (dladdr (addr, &info) != 0) | |
664 | return info.dli_fname; | |
665 | return NULL; | |
666 | } | |
667 | ||
2471d008 | 668 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
669 | Return 1 on success. |
670 | Failure could happen if libthread_db does not have symbols we expect, | |
671 | or when it refuses to work with the current inferior (e.g. due to | |
672 | version mismatch between libthread_db and libpthread). */ | |
673 | ||
674 | static int | |
d90e17a7 | 675 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
676 | { |
677 | td_err_e err; | |
678 | ||
679 | /* Initialize pointers to the dynamic library functions we will use. | |
680 | Essential functions first. */ | |
681 | ||
d90e17a7 PA |
682 | info->td_init_p = verbose_dlsym (info->handle, "td_init"); |
683 | if (info->td_init_p == NULL) | |
17a37d48 PP |
684 | return 0; |
685 | ||
d90e17a7 | 686 | err = info->td_init_p (); |
17a37d48 PP |
687 | if (err != TD_OK) |
688 | { | |
3e43a32a MS |
689 | warning (_("Cannot initialize libthread_db: %s"), |
690 | thread_db_err_str (err)); | |
17a37d48 PP |
691 | return 0; |
692 | } | |
693 | ||
d90e17a7 PA |
694 | info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new"); |
695 | if (info->td_ta_new_p == NULL) | |
17a37d48 PP |
696 | return 0; |
697 | ||
698 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 699 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
700 | |
701 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 702 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
703 | if (err != TD_OK) |
704 | { | |
02d868e8 | 705 | if (libthread_db_debug) |
883ed13e PA |
706 | fprintf_unfiltered (gdb_stdlog, _("td_ta_new failed: %s\n"), |
707 | thread_db_err_str (err)); | |
17a37d48 PP |
708 | else |
709 | switch (err) | |
710 | { | |
711 | case TD_NOLIBTHREAD: | |
712 | #ifdef THREAD_DB_HAS_TD_VERSION | |
713 | case TD_VERSION: | |
714 | #endif | |
715 | /* The errors above are not unexpected and silently ignored: | |
716 | they just mean we haven't found correct version of | |
717 | libthread_db yet. */ | |
718 | break; | |
719 | default: | |
720 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
721 | } | |
722 | return 0; | |
723 | } | |
724 | ||
d90e17a7 PA |
725 | info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr"); |
726 | if (info->td_ta_map_id2thr_p == NULL) | |
17a37d48 PP |
727 | return 0; |
728 | ||
3e43a32a MS |
729 | info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, |
730 | "td_ta_map_lwp2thr"); | |
d90e17a7 | 731 | if (info->td_ta_map_lwp2thr_p == NULL) |
17a37d48 PP |
732 | return 0; |
733 | ||
d90e17a7 PA |
734 | info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter"); |
735 | if (info->td_ta_thr_iter_p == NULL) | |
17a37d48 PP |
736 | return 0; |
737 | ||
d90e17a7 PA |
738 | info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate"); |
739 | if (info->td_thr_validate_p == NULL) | |
17a37d48 PP |
740 | return 0; |
741 | ||
d90e17a7 PA |
742 | info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info"); |
743 | if (info->td_thr_get_info_p == NULL) | |
17a37d48 PP |
744 | return 0; |
745 | ||
746 | /* These are not essential. */ | |
d90e17a7 PA |
747 | info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr"); |
748 | info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event"); | |
21e1bee4 | 749 | info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event"); |
d90e17a7 PA |
750 | info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg"); |
751 | info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable"); | |
752 | info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr"); | |
5876f503 | 753 | info->td_thr_tlsbase_p = dlsym (info->handle, "td_thr_tlsbase"); |
17a37d48 | 754 | |
2db9a427 PA |
755 | /* It's best to avoid td_ta_thr_iter if possible. That walks data |
756 | structures in the inferior's address space that may be corrupted, | |
757 | or, if the target is running, may change while we walk them. If | |
758 | there's execution (and /proc is mounted), then we're already | |
759 | attached to all LWPs. Use thread_from_lwp, which uses | |
760 | td_ta_map_lwp2thr instead, which does not walk the thread list. | |
761 | ||
762 | td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that | |
763 | currently on core targets, as it uses ptrace directly. */ | |
764 | if (target_has_execution | |
765 | && linux_proc_task_list_dir_exists (ptid_get_pid (inferior_ptid))) | |
766 | { | |
767 | struct lwp_info *lp; | |
768 | int pid = ptid_get_pid (inferior_ptid); | |
769 | ||
770 | linux_stop_and_wait_all_lwps (); | |
771 | ||
772 | ALL_LWPS (lp) | |
773 | if (ptid_get_pid (lp->ptid) == pid) | |
774 | thread_from_lwp (lp->ptid); | |
775 | ||
776 | linux_unstop_all_lwps (); | |
777 | } | |
778 | else if (thread_db_find_new_threads_silently (inferior_ptid) != 0) | |
fcb44371 JK |
779 | { |
780 | /* Even if libthread_db initializes, if the thread list is | |
781 | corrupted, we'd not manage to list any threads. Better reject this | |
782 | thread_db, and fall back to at least listing LWPs. */ | |
783 | return 0; | |
784 | } | |
785 | ||
17a37d48 PP |
786 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
787 | ||
883ed13e | 788 | if (*libthread_db_search_path || libthread_db_debug) |
d90e17a7 | 789 | { |
883ed13e | 790 | struct ui_file *file; |
d90e17a7 | 791 | const char *library; |
17a37d48 | 792 | |
d90e17a7 PA |
793 | library = dladdr_to_soname (*info->td_ta_new_p); |
794 | if (library == NULL) | |
795 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 796 | |
883ed13e PA |
797 | /* If we'd print this to gdb_stdout when debug output is |
798 | disabled, still print it to gdb_stdout if debug output is | |
799 | enabled. User visible output should not depend on debug | |
800 | settings. */ | |
801 | file = *libthread_db_search_path != '\0' ? gdb_stdout : gdb_stdlog; | |
802 | fprintf_unfiltered (file, _("Using host libthread_db library \"%s\".\n"), | |
803 | library); | |
d90e17a7 | 804 | } |
17a37d48 | 805 | |
d90e17a7 PA |
806 | /* The thread library was detected. Activate the thread_db target |
807 | if this is the first process using it. */ | |
808 | if (thread_db_list->next == NULL) | |
809 | push_target (&thread_db_ops); | |
17a37d48 | 810 | |
856d6f99 | 811 | /* Enable event reporting, but not when debugging a core file. */ |
c1a747c1 | 812 | if (target_has_execution && thread_db_use_events ()) |
856d6f99 | 813 | enable_thread_event_reporting (); |
456b0e24 | 814 | |
d90e17a7 | 815 | return 1; |
17a37d48 PP |
816 | } |
817 | ||
818 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
819 | relative, or just LIBTHREAD_DB. */ | |
820 | ||
821 | static int | |
fde4f8ed | 822 | try_thread_db_load (const char *library, int check_auto_load_safe) |
17a37d48 PP |
823 | { |
824 | void *handle; | |
d90e17a7 | 825 | struct thread_db_info *info; |
17a37d48 | 826 | |
02d868e8 | 827 | if (libthread_db_debug) |
883ed13e PA |
828 | fprintf_unfiltered (gdb_stdlog, |
829 | _("Trying host libthread_db library: %s.\n"), | |
830 | library); | |
fde4f8ed JK |
831 | |
832 | if (check_auto_load_safe) | |
833 | { | |
834 | if (access (library, R_OK) != 0) | |
835 | { | |
836 | /* Do not print warnings by file_is_auto_load_safe if the library does | |
837 | not exist at this place. */ | |
838 | if (libthread_db_debug) | |
883ed13e PA |
839 | fprintf_unfiltered (gdb_stdlog, _("open failed: %s.\n"), |
840 | safe_strerror (errno)); | |
fde4f8ed JK |
841 | return 0; |
842 | } | |
843 | ||
844 | if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db " | |
845 | "library \"%s\" from explicit " | |
846 | "directory.\n"), | |
847 | library)) | |
848 | return 0; | |
849 | } | |
850 | ||
17a37d48 PP |
851 | handle = dlopen (library, RTLD_NOW); |
852 | if (handle == NULL) | |
853 | { | |
02d868e8 | 854 | if (libthread_db_debug) |
883ed13e | 855 | fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ()); |
17a37d48 PP |
856 | return 0; |
857 | } | |
858 | ||
02d868e8 | 859 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
860 | { |
861 | void *td_init; | |
862 | ||
863 | td_init = dlsym (handle, "td_init"); | |
864 | if (td_init != NULL) | |
865 | { | |
866 | const char *const libpath = dladdr_to_soname (td_init); | |
867 | ||
868 | if (libpath != NULL) | |
883ed13e | 869 | fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"), |
17a37d48 PP |
870 | library, libpath); |
871 | } | |
872 | } | |
873 | ||
d90e17a7 PA |
874 | info = add_thread_db_info (handle); |
875 | ||
bf88dd68 JK |
876 | /* Do not save system library name, that one is always trusted. */ |
877 | if (strchr (library, '/') != NULL) | |
878 | info->filename = gdb_realpath (library); | |
879 | ||
d90e17a7 | 880 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
881 | return 1; |
882 | ||
883 | /* This library "refused" to work on current inferior. */ | |
dfd4cc63 | 884 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
17a37d48 PP |
885 | return 0; |
886 | } | |
887 | ||
290351b8 | 888 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
889 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
890 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
891 | The result is true for success. */ |
892 | ||
893 | static int | |
e6712ff1 | 894 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 895 | { |
05386e9e TT |
896 | struct cleanup *cleanup; |
897 | char *path, *cp; | |
898 | int result; | |
4262abfb | 899 | const char *obj_name = objfile_name (obj); |
290351b8 | 900 | |
4262abfb | 901 | if (obj_name[0] != '/') |
290351b8 DE |
902 | { |
903 | warning (_("Expected absolute pathname for libpthread in the" | |
4262abfb | 904 | " inferior, but got %s."), obj_name); |
290351b8 DE |
905 | return 0; |
906 | } | |
05386e9e | 907 | |
4262abfb | 908 | path = xmalloc (strlen (obj_name) + (subdir ? strlen (subdir) + 1 : 0) |
e6712ff1 | 909 | + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
05386e9e TT |
910 | cleanup = make_cleanup (xfree, path); |
911 | ||
4262abfb | 912 | strcpy (path, obj_name); |
05386e9e TT |
913 | cp = strrchr (path, '/'); |
914 | /* This should at minimum hit the first character. */ | |
915 | gdb_assert (cp != NULL); | |
e6712ff1 DE |
916 | cp[1] = '\0'; |
917 | if (subdir != NULL) | |
918 | { | |
919 | strcat (cp, subdir); | |
920 | strcat (cp, "/"); | |
921 | } | |
922 | strcat (cp, LIBTHREAD_DB_SO); | |
bccbefd2 | 923 | |
fde4f8ed | 924 | result = try_thread_db_load (path, 1); |
05386e9e TT |
925 | |
926 | do_cleanups (cleanup); | |
927 | return result; | |
290351b8 DE |
928 | } |
929 | ||
98a5dd13 | 930 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
931 | Look for libthread_db in directory(libpthread)/SUBDIR. |
932 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
933 | The result is true for success. */ |
934 | ||
935 | static int | |
e6712ff1 | 936 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 DE |
937 | { |
938 | struct objfile *obj; | |
939 | ||
bf88dd68 JK |
940 | if (!auto_load_thread_db) |
941 | return 0; | |
942 | ||
98a5dd13 | 943 | ALL_OBJFILES (obj) |
4262abfb | 944 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 945 | { |
e6712ff1 | 946 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
290351b8 DE |
947 | return 1; |
948 | ||
949 | /* We may have found the separate-debug-info version of | |
950 | libpthread, and it may live in a directory without a matching | |
951 | libthread_db. */ | |
952 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
953 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
954 | subdir); | |
290351b8 | 955 | |
98a5dd13 DE |
956 | return 0; |
957 | } | |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
962 | /* Handle $sdir in libthread-db-search-path. | |
963 | Look for libthread_db in the system dirs, or wherever a plain | |
964 | dlopen(file_without_path) will look. | |
965 | The result is true for success. */ | |
966 | ||
967 | static int | |
968 | try_thread_db_load_from_sdir (void) | |
969 | { | |
fde4f8ed | 970 | return try_thread_db_load (LIBTHREAD_DB_SO, 0); |
98a5dd13 DE |
971 | } |
972 | ||
973 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
974 | The result is true for success. */ | |
975 | ||
976 | static int | |
977 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
978 | { | |
05386e9e TT |
979 | struct cleanup *cleanup; |
980 | char *path; | |
981 | int result; | |
98a5dd13 | 982 | |
bf88dd68 JK |
983 | if (!auto_load_thread_db) |
984 | return 0; | |
985 | ||
05386e9e TT |
986 | path = xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1); |
987 | cleanup = make_cleanup (xfree, path); | |
98a5dd13 DE |
988 | |
989 | memcpy (path, dir, dir_len); | |
990 | path[dir_len] = '/'; | |
991 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
bccbefd2 | 992 | |
fde4f8ed | 993 | result = try_thread_db_load (path, 1); |
05386e9e TT |
994 | |
995 | do_cleanups (cleanup); | |
996 | return result; | |
98a5dd13 DE |
997 | } |
998 | ||
17a37d48 | 999 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
1000 | to work on current inferior. |
1001 | The result is true for success. */ | |
17a37d48 PP |
1002 | |
1003 | static int | |
1004 | thread_db_load_search (void) | |
1005 | { | |
e6712ff1 DE |
1006 | VEC (char_ptr) *dir_vec; |
1007 | struct cleanup *cleanups; | |
1008 | char *this_dir; | |
1009 | int i, rc = 0; | |
17a37d48 | 1010 | |
e6712ff1 DE |
1011 | dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path); |
1012 | cleanups = make_cleanup_free_char_ptr_vec (dir_vec); | |
1013 | ||
1014 | for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i) | |
17a37d48 | 1015 | { |
e6712ff1 | 1016 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 1017 | size_t this_dir_len; |
e0881a8e | 1018 | |
e6712ff1 | 1019 | this_dir_len = strlen (this_dir); |
17a37d48 | 1020 | |
e6712ff1 DE |
1021 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
1022 | && (this_dir[pdir_len] == '\0' | |
1023 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 1024 | { |
e6712ff1 | 1025 | char *subdir = NULL; |
1fc3cf4a TT |
1026 | struct cleanup *free_subdir_cleanup |
1027 | = make_cleanup (null_cleanup, NULL); | |
e6712ff1 DE |
1028 | |
1029 | if (this_dir[pdir_len] == '/') | |
98a5dd13 | 1030 | { |
e6712ff1 | 1031 | subdir = xmalloc (strlen (this_dir)); |
1fc3cf4a | 1032 | make_cleanup (xfree, subdir); |
e6712ff1 | 1033 | strcpy (subdir, this_dir + pdir_len + 1); |
98a5dd13 | 1034 | } |
e6712ff1 | 1035 | rc = try_thread_db_load_from_pdir (subdir); |
1fc3cf4a | 1036 | do_cleanups (free_subdir_cleanup); |
e6712ff1 DE |
1037 | if (rc) |
1038 | break; | |
17a37d48 | 1039 | } |
e6712ff1 | 1040 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
1041 | { |
1042 | if (try_thread_db_load_from_sdir ()) | |
1043 | { | |
1044 | rc = 1; | |
1045 | break; | |
1046 | } | |
1047 | } | |
1048 | else | |
17a37d48 | 1049 | { |
98a5dd13 DE |
1050 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
1051 | { | |
1052 | rc = 1; | |
1053 | break; | |
1054 | } | |
17a37d48 PP |
1055 | } |
1056 | } | |
98a5dd13 | 1057 | |
e6712ff1 | 1058 | do_cleanups (cleanups); |
98a5dd13 | 1059 | if (libthread_db_debug) |
883ed13e PA |
1060 | fprintf_unfiltered (gdb_stdlog, |
1061 | _("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1062 | return rc; |
1063 | } | |
1064 | ||
98a5dd13 DE |
1065 | /* Return non-zero if the inferior has a libpthread. */ |
1066 | ||
1067 | static int | |
1068 | has_libpthread (void) | |
1069 | { | |
1070 | struct objfile *obj; | |
1071 | ||
1072 | ALL_OBJFILES (obj) | |
4262abfb | 1073 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 DE |
1074 | return 1; |
1075 | ||
1076 | return 0; | |
1077 | } | |
1078 | ||
17a37d48 | 1079 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1080 | Return 1 on success. */ |
17a37d48 PP |
1081 | |
1082 | static int | |
1083 | thread_db_load (void) | |
1084 | { | |
d90e17a7 | 1085 | struct thread_db_info *info; |
17a37d48 | 1086 | |
dfd4cc63 | 1087 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 PA |
1088 | |
1089 | if (info != NULL) | |
17a37d48 PP |
1090 | return 1; |
1091 | ||
856d6f99 PA |
1092 | /* Don't attempt to use thread_db on executables not running |
1093 | yet. */ | |
1094 | if (!target_has_registers) | |
17a37d48 PP |
1095 | return 0; |
1096 | ||
1097 | /* Don't attempt to use thread_db for remote targets. */ | |
856d6f99 | 1098 | if (!(target_can_run (¤t_target) || core_bfd)) |
17a37d48 PP |
1099 | return 0; |
1100 | ||
1101 | if (thread_db_load_search ()) | |
1102 | return 1; | |
1103 | ||
98a5dd13 DE |
1104 | /* We couldn't find a libthread_db. |
1105 | If the inferior has a libpthread warn the user. */ | |
1106 | if (has_libpthread ()) | |
1107 | { | |
1108 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1109 | " library, thread debugging will not be available.")); | |
1110 | return 0; | |
17a37d48 | 1111 | } |
98a5dd13 | 1112 | |
17a37d48 PP |
1113 | /* Either this executable isn't using libpthread at all, or it is |
1114 | statically linked. Since we can't easily distinguish these two cases, | |
1115 | no warning is issued. */ | |
1116 | return 0; | |
1117 | } | |
1118 | ||
fb0e1ba7 | 1119 | static void |
12b6a110 | 1120 | disable_thread_event_reporting (struct thread_db_info *info) |
fb0e1ba7 | 1121 | { |
21e1bee4 | 1122 | if (info->td_ta_clear_event_p != NULL) |
12b6a110 PP |
1123 | { |
1124 | td_thr_events_t events; | |
fb0e1ba7 | 1125 | |
12b6a110 PP |
1126 | /* Set the process wide mask saying we aren't interested in any |
1127 | events anymore. */ | |
21e1bee4 PP |
1128 | td_event_fillset (&events); |
1129 | info->td_ta_clear_event_p (info->thread_agent, &events); | |
12b6a110 | 1130 | } |
fb0e1ba7 | 1131 | |
d90e17a7 PA |
1132 | info->td_create_bp_addr = 0; |
1133 | info->td_death_bp_addr = 0; | |
fb0e1ba7 MK |
1134 | } |
1135 | ||
1136 | static void | |
1137 | check_thread_signals (void) | |
1138 | { | |
21bf60fe | 1139 | if (!thread_signals) |
fb0e1ba7 MK |
1140 | { |
1141 | sigset_t mask; | |
1142 | int i; | |
1143 | ||
669211f5 | 1144 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1145 | sigemptyset (&thread_stop_set); |
1146 | sigemptyset (&thread_print_set); | |
1147 | ||
b9569773 | 1148 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1149 | { |
1150 | if (sigismember (&mask, i)) | |
1151 | { | |
2ea28649 | 1152 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 1153 | sigaddset (&thread_stop_set, i); |
2ea28649 | 1154 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
1155 | sigaddset (&thread_print_set, i); |
1156 | thread_signals = 1; | |
1157 | } | |
1158 | } | |
1159 | } | |
fb0e1ba7 MK |
1160 | } |
1161 | ||
0ec9a092 DJ |
1162 | /* Check whether thread_db is usable. This function is called when |
1163 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1164 | and when new shared libraries are loaded into a running process. */ | |
1165 | ||
1166 | void | |
1167 | check_for_thread_db (void) | |
fb0e1ba7 | 1168 | { |
b5057acd | 1169 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1170 | if (!thread_db_load ()) |
b5057acd | 1171 | return; |
0ec9a092 DJ |
1172 | } |
1173 | ||
0838fb57 DE |
1174 | /* This function is called via the new_objfile observer. */ |
1175 | ||
0ec9a092 DJ |
1176 | static void |
1177 | thread_db_new_objfile (struct objfile *objfile) | |
1178 | { | |
d90e17a7 PA |
1179 | /* This observer must always be called with inferior_ptid set |
1180 | correctly. */ | |
1181 | ||
0838fb57 | 1182 | if (objfile != NULL |
fcb44371 | 1183 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 1184 | loaded (and notified without successful thread_db initialization) |
fcb44371 JK |
1185 | the time observer_notify_new_objfile is called for the library itself. |
1186 | Static executables have their separate debug info loaded already | |
1187 | before the inferior has started. */ | |
1188 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1189 | /* Only check for thread_db if we loaded libpthread, |
1190 | or if this is the main symbol file. | |
1191 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1192 | a statically linked executable AND the symbol file is specified AFTER | |
1193 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1194 | For dynamically linked executables, libpthread can be near the end | |
1195 | of the list of shared libraries to load, and in an app of several | |
1196 | thousand shared libraries, this can otherwise be painful. */ | |
1197 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 1198 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 1199 | check_for_thread_db (); |
fb0e1ba7 MK |
1200 | } |
1201 | ||
015de688 DC |
1202 | static void |
1203 | check_pid_namespace_match (void) | |
1204 | { | |
1205 | /* Check is only relevant for local targets targets. */ | |
1206 | if (target_can_run (¤t_target)) | |
1207 | { | |
1208 | /* If the child is in a different PID namespace, its idea of its | |
1209 | PID will differ from our idea of its PID. When we scan the | |
1210 | child's thread list, we'll mistakenly think it has no threads | |
1211 | since the thread PID fields won't match the PID we give to | |
1212 | libthread_db. */ | |
1213 | char *our_pid_ns = linux_proc_pid_get_ns (getpid (), "pid"); | |
1214 | char *inferior_pid_ns = linux_proc_pid_get_ns ( | |
1215 | ptid_get_pid (inferior_ptid), "pid"); | |
1216 | ||
1217 | if (our_pid_ns != NULL && inferior_pid_ns != NULL | |
1218 | && strcmp (our_pid_ns, inferior_pid_ns) != 0) | |
1219 | { | |
1220 | warning (_ ("Target and debugger are in different PID " | |
1221 | "namespaces; thread lists and other data are " | |
1222 | "likely unreliable")); | |
1223 | } | |
1224 | ||
1225 | xfree (our_pid_ns); | |
1226 | xfree (inferior_pid_ns); | |
1227 | } | |
1228 | } | |
1229 | ||
0838fb57 DE |
1230 | /* This function is called via the inferior_created observer. |
1231 | This handles the case of debugging statically linked executables. */ | |
1232 | ||
1233 | static void | |
1234 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1235 | { | |
015de688 | 1236 | check_pid_namespace_match (); |
0838fb57 DE |
1237 | check_for_thread_db (); |
1238 | } | |
1239 | ||
c1a747c1 PA |
1240 | /* Update the thread's state (what's displayed in "info threads"), |
1241 | from libthread_db thread state information. */ | |
1242 | ||
1243 | static void | |
fe978cb0 | 1244 | update_thread_state (struct private_thread_info *priv, |
c1a747c1 PA |
1245 | const td_thrinfo_t *ti_p) |
1246 | { | |
fe978cb0 PA |
1247 | priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN |
1248 | || ti_p->ti_state == TD_THR_ZOMBIE); | |
c1a747c1 PA |
1249 | } |
1250 | ||
a2f23071 DJ |
1251 | /* Attach to a new thread. This function is called when we receive a |
1252 | TD_CREATE event or when we iterate over all threads and find one | |
02c6c942 | 1253 | that wasn't already in our list. Returns true on success. */ |
a2f23071 | 1254 | |
02c6c942 | 1255 | static int |
39f77062 | 1256 | attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
93815fbf | 1257 | const td_thrinfo_t *ti_p) |
fb0e1ba7 | 1258 | { |
2a2ef594 | 1259 | struct thread_info *tp; |
d90e17a7 | 1260 | struct thread_db_info *info; |
fb0e1ba7 | 1261 | |
a2f23071 DJ |
1262 | /* If we're being called after a TD_CREATE event, we may already |
1263 | know about this thread. There are two ways this can happen. We | |
1264 | may have iterated over all threads between the thread creation | |
1265 | and the TD_CREATE event, for instance when the user has issued | |
1266 | the `info threads' command before the SIGTRAP for hitting the | |
1267 | thread creation breakpoint was reported. Alternatively, the | |
1268 | thread may have exited and a new one been created with the same | |
1269 | thread ID. In the first case we don't need to do anything; in | |
1270 | the second case we should discard information about the dead | |
1271 | thread and attach to the new one. */ | |
2a2ef594 PA |
1272 | tp = find_thread_ptid (ptid); |
1273 | if (tp != NULL) | |
a2f23071 | 1274 | { |
fe978cb0 | 1275 | /* If tp->priv is NULL, then GDB is already attached to this |
17faa917 DJ |
1276 | thread, but we do not know anything about it. We can learn |
1277 | about it here. This can only happen if we have some other | |
1278 | way besides libthread_db to notice new threads (i.e. | |
1279 | PTRACE_EVENT_CLONE); assume the same mechanism notices thread | |
1280 | exit, so this can not be a stale thread recreated with the | |
1281 | same ID. */ | |
fe978cb0 | 1282 | if (tp->priv != NULL) |
17faa917 | 1283 | { |
fe978cb0 | 1284 | if (!tp->priv->dying) |
02c6c942 | 1285 | return 0; |
a2f23071 | 1286 | |
17faa917 DJ |
1287 | delete_thread (ptid); |
1288 | tp = NULL; | |
1289 | } | |
a2f23071 DJ |
1290 | } |
1291 | ||
9ee57c33 | 1292 | /* Under GNU/Linux, we have to attach to each and every thread. */ |
856d6f99 | 1293 | if (target_has_execution |
84636d28 PA |
1294 | && tp == NULL) |
1295 | { | |
1296 | int res; | |
1297 | ||
dfd4cc63 LM |
1298 | res = lin_lwp_attach_lwp (ptid_build (ptid_get_pid (ptid), |
1299 | ti_p->ti_lid, 0)); | |
84636d28 PA |
1300 | if (res < 0) |
1301 | { | |
1302 | /* Error, stop iterating. */ | |
1303 | return 0; | |
1304 | } | |
1305 | else if (res > 0) | |
1306 | { | |
1307 | /* Pretend this thread doesn't exist yet, and keep | |
1308 | iterating. */ | |
1309 | return 1; | |
1310 | } | |
1311 | ||
1312 | /* Otherwise, we sucessfully attached to the thread. */ | |
1313 | } | |
9ee57c33 | 1314 | |
2db9a427 PA |
1315 | info = get_thread_db_info (ptid_get_pid (ptid)); |
1316 | record_thread (info, tp, ptid, th_p, ti_p); | |
1317 | return 1; | |
1318 | } | |
1319 | ||
1320 | /* Record a new thread in GDB's thread list. Creates the thread's | |
1321 | private info. If TP is NULL, creates a new thread. Otherwise, | |
1322 | uses TP. */ | |
1323 | ||
1324 | static void | |
1325 | record_thread (struct thread_db_info *info, | |
1326 | struct thread_info *tp, | |
1327 | ptid_t ptid, const td_thrhandle_t *th_p, | |
1328 | const td_thrinfo_t *ti_p) | |
1329 | { | |
1330 | td_err_e err; | |
fe978cb0 | 1331 | struct private_thread_info *priv; |
2db9a427 PA |
1332 | int new_thread = (tp == NULL); |
1333 | ||
1334 | /* A thread ID of zero may mean the thread library has not | |
1335 | initialized yet. Leave private == NULL until the thread library | |
1336 | has initialized. */ | |
1337 | if (ti_p->ti_tid == 0) | |
1338 | return; | |
1339 | ||
17faa917 | 1340 | /* Construct the thread's private data. */ |
fe978cb0 PA |
1341 | priv = xmalloc (sizeof (struct private_thread_info)); |
1342 | memset (priv, 0, sizeof (struct private_thread_info)); | |
17faa917 | 1343 | |
fe978cb0 PA |
1344 | priv->th = *th_p; |
1345 | priv->tid = ti_p->ti_tid; | |
1346 | update_thread_state (priv, ti_p); | |
17faa917 | 1347 | |
fb0e1ba7 | 1348 | /* Add the thread to GDB's thread list. */ |
17faa917 | 1349 | if (tp == NULL) |
fe978cb0 | 1350 | tp = add_thread_with_info (ptid, priv); |
17faa917 | 1351 | else |
fe978cb0 | 1352 | tp->priv = priv; |
5365276c | 1353 | |
856d6f99 PA |
1354 | /* Enable thread event reporting for this thread, except when |
1355 | debugging a core file. */ | |
2db9a427 | 1356 | if (target_has_execution && thread_db_use_events () && new_thread) |
856d6f99 PA |
1357 | { |
1358 | err = info->td_thr_event_enable_p (th_p, 1); | |
1359 | if (err != TD_OK) | |
1360 | error (_("Cannot enable thread event reporting for %s: %s"), | |
1361 | target_pid_to_str (ptid), thread_db_err_str (err)); | |
1362 | } | |
1363 | ||
2db9a427 PA |
1364 | if (target_has_execution) |
1365 | check_thread_signals (); | |
fb0e1ba7 MK |
1366 | } |
1367 | ||
1368 | static void | |
17faa917 | 1369 | detach_thread (ptid_t ptid) |
fb0e1ba7 | 1370 | { |
a2f23071 DJ |
1371 | struct thread_info *thread_info; |
1372 | ||
a2f23071 DJ |
1373 | /* Don't delete the thread now, because it still reports as active |
1374 | until it has executed a few instructions after the event | |
1375 | breakpoint - if we deleted it now, "info threads" would cause us | |
1376 | to re-attach to it. Just mark it as having had a TD_DEATH | |
1377 | event. This means that we won't delete it from our thread list | |
1378 | until we notice that it's dead (via prune_threads), or until | |
17faa917 DJ |
1379 | something re-uses its thread ID. We'll report the thread exit |
1380 | when the underlying LWP dies. */ | |
e09875d4 | 1381 | thread_info = find_thread_ptid (ptid); |
fe978cb0 PA |
1382 | gdb_assert (thread_info != NULL && thread_info->priv != NULL); |
1383 | thread_info->priv->dying = 1; | |
fb0e1ba7 MK |
1384 | } |
1385 | ||
1386 | static void | |
52554a0e | 1387 | thread_db_detach (struct target_ops *ops, const char *args, int from_tty) |
fb0e1ba7 | 1388 | { |
117de6a9 | 1389 | struct target_ops *target_beneath = find_target_beneath (ops); |
d90e17a7 | 1390 | struct thread_db_info *info; |
117de6a9 | 1391 | |
dfd4cc63 | 1392 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
c194fbe1 | 1393 | |
d90e17a7 PA |
1394 | if (info) |
1395 | { | |
c1a747c1 | 1396 | if (target_has_execution && thread_db_use_events ()) |
856d6f99 PA |
1397 | { |
1398 | disable_thread_event_reporting (info); | |
1399 | ||
1400 | /* Delete the old thread event breakpoints. Note that | |
1401 | unlike when mourning, we can remove them here because | |
1402 | there's still a live inferior to poke at. In any case, | |
1403 | GDB will not try to insert anything in the inferior when | |
1404 | removing a breakpoint. */ | |
1405 | remove_thread_event_breakpoints (); | |
1406 | } | |
d90e17a7 | 1407 | |
dfd4cc63 | 1408 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 | 1409 | } |
4105de34 | 1410 | |
7a7d3353 | 1411 | target_beneath->to_detach (target_beneath, args, from_tty); |
d90e17a7 PA |
1412 | |
1413 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1414 | ||
1415 | /* If there are no more processes using libpthread, detach the | |
1416 | thread_db target ops. */ | |
1417 | if (!thread_db_list) | |
1418 | unpush_target (&thread_db_ops); | |
fb0e1ba7 MK |
1419 | } |
1420 | ||
fb0e1ba7 MK |
1421 | /* Check if PID is currently stopped at the location of a thread event |
1422 | breakpoint location. If it is, read the event message and act upon | |
1423 | the event. */ | |
1424 | ||
1425 | static void | |
39f77062 | 1426 | check_event (ptid_t ptid) |
fb0e1ba7 | 1427 | { |
515630c5 UW |
1428 | struct regcache *regcache = get_thread_regcache (ptid); |
1429 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
fb0e1ba7 MK |
1430 | td_event_msg_t msg; |
1431 | td_thrinfo_t ti; | |
1432 | td_err_e err; | |
1433 | CORE_ADDR stop_pc; | |
4d9850d3 | 1434 | int loop = 0; |
d90e17a7 PA |
1435 | struct thread_db_info *info; |
1436 | ||
dfd4cc63 | 1437 | info = get_thread_db_info (ptid_get_pid (ptid)); |
fb0e1ba7 MK |
1438 | |
1439 | /* Bail out early if we're not at a thread event breakpoint. */ | |
515630c5 | 1440 | stop_pc = regcache_read_pc (regcache) |
118e6252 | 1441 | - target_decr_pc_after_break (gdbarch); |
d90e17a7 PA |
1442 | if (stop_pc != info->td_create_bp_addr |
1443 | && stop_pc != info->td_death_bp_addr) | |
fb0e1ba7 MK |
1444 | return; |
1445 | ||
4c28f408 | 1446 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1447 | info->proc_handle.ptid = ptid; |
4c28f408 PA |
1448 | |
1449 | /* If we have only looked at the first thread before libpthread was | |
1450 | initialized, we may not know its thread ID yet. Make sure we do | |
1451 | before we add another thread to the list. */ | |
d90e17a7 PA |
1452 | if (!have_threads (ptid)) |
1453 | thread_db_find_new_threads_1 (ptid); | |
4c28f408 | 1454 | |
4d9850d3 JJ |
1455 | /* If we are at a create breakpoint, we do not know what new lwp |
1456 | was created and cannot specifically locate the event message for it. | |
1457 | We have to call td_ta_event_getmsg() to get | |
1458 | the latest message. Since we have no way of correlating whether | |
cdbc0b18 | 1459 | the event message we get back corresponds to our breakpoint, we must |
4d9850d3 | 1460 | loop and read all event messages, processing them appropriately. |
cdbc0b18 RM |
1461 | This guarantees we will process the correct message before continuing |
1462 | from the breakpoint. | |
4d9850d3 JJ |
1463 | |
1464 | Currently, death events are not enabled. If they are enabled, | |
1465 | the death event can use the td_thr_event_getmsg() interface to | |
1466 | get the message specifically for that lwp and avoid looping | |
1467 | below. */ | |
1468 | ||
1469 | loop = 1; | |
1470 | ||
1471 | do | |
fb0e1ba7 | 1472 | { |
d90e17a7 | 1473 | err = info->td_ta_event_getmsg_p (info->thread_agent, &msg); |
4d9850d3 JJ |
1474 | if (err != TD_OK) |
1475 | { | |
1476 | if (err == TD_NOMSG) | |
1477 | return; | |
fb0e1ba7 | 1478 | |
8a3fe4f8 | 1479 | error (_("Cannot get thread event message: %s"), |
4d9850d3 JJ |
1480 | thread_db_err_str (err)); |
1481 | } | |
fb0e1ba7 | 1482 | |
d90e17a7 | 1483 | err = info->td_thr_get_info_p (msg.th_p, &ti); |
4d9850d3 | 1484 | if (err != TD_OK) |
8a3fe4f8 | 1485 | error (_("Cannot get thread info: %s"), thread_db_err_str (err)); |
fb0e1ba7 | 1486 | |
dfd4cc63 | 1487 | ptid = ptid_build (ptid_get_pid (ptid), ti.ti_lid, 0); |
fb0e1ba7 | 1488 | |
4d9850d3 JJ |
1489 | switch (msg.event) |
1490 | { | |
1491 | case TD_CREATE: | |
a2f23071 DJ |
1492 | /* Call attach_thread whether or not we already know about a |
1493 | thread with this thread ID. */ | |
93815fbf | 1494 | attach_thread (ptid, msg.th_p, &ti); |
fb0e1ba7 | 1495 | |
4d9850d3 | 1496 | break; |
fb0e1ba7 | 1497 | |
4d9850d3 | 1498 | case TD_DEATH: |
fb0e1ba7 | 1499 | |
4d9850d3 | 1500 | if (!in_thread_list (ptid)) |
8a3fe4f8 | 1501 | error (_("Spurious thread death event.")); |
fb0e1ba7 | 1502 | |
17faa917 | 1503 | detach_thread (ptid); |
fb0e1ba7 | 1504 | |
4d9850d3 | 1505 | break; |
fb0e1ba7 | 1506 | |
4d9850d3 | 1507 | default: |
8a3fe4f8 | 1508 | error (_("Spurious thread event.")); |
4d9850d3 | 1509 | } |
fb0e1ba7 | 1510 | } |
4d9850d3 | 1511 | while (loop); |
fb0e1ba7 MK |
1512 | } |
1513 | ||
39f77062 | 1514 | static ptid_t |
117de6a9 | 1515 | thread_db_wait (struct target_ops *ops, |
47608cb1 PA |
1516 | ptid_t ptid, struct target_waitstatus *ourstatus, |
1517 | int options) | |
fb0e1ba7 | 1518 | { |
d90e17a7 | 1519 | struct thread_db_info *info; |
117de6a9 PA |
1520 | struct target_ops *beneath = find_target_beneath (ops); |
1521 | ||
47608cb1 | 1522 | ptid = beneath->to_wait (beneath, ptid, ourstatus, options); |
fb0e1ba7 | 1523 | |
b84876c2 PA |
1524 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) |
1525 | return ptid; | |
1526 | ||
1111f4aa | 1527 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
fb66883a PA |
1528 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
1529 | return ptid; | |
fb0e1ba7 | 1530 | |
dfd4cc63 | 1531 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1532 | |
1533 | /* If this process isn't using thread_db, we're done. */ | |
1534 | if (info == NULL) | |
1535 | return ptid; | |
1536 | ||
3f64f7b1 DJ |
1537 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1538 | { | |
d90e17a7 PA |
1539 | /* New image, it may or may not end up using thread_db. Assume |
1540 | not unless we find otherwise. */ | |
dfd4cc63 | 1541 | delete_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1542 | if (!thread_db_list) |
1543 | unpush_target (&thread_db_ops); | |
3f64f7b1 | 1544 | |
6c95b8df PA |
1545 | /* Thread event breakpoints are deleted by |
1546 | update_breakpoints_after_exec. */ | |
1547 | ||
49fd4a42 | 1548 | return ptid; |
3f64f7b1 DJ |
1549 | } |
1550 | ||
fb0e1ba7 | 1551 | if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
a493e3e2 | 1552 | && ourstatus->value.sig == GDB_SIGNAL_TRAP) |
fb0e1ba7 | 1553 | /* Check for a thread event. */ |
39f77062 | 1554 | check_event (ptid); |
fb0e1ba7 | 1555 | |
2db9a427 PA |
1556 | /* Fill in the thread's user-level thread id and status. */ |
1557 | thread_from_lwp (ptid); | |
fb0e1ba7 | 1558 | |
b9b5d7ea | 1559 | return ptid; |
fb0e1ba7 MK |
1560 | } |
1561 | ||
fb0e1ba7 | 1562 | static void |
136d6dae | 1563 | thread_db_mourn_inferior (struct target_ops *ops) |
fb0e1ba7 | 1564 | { |
117de6a9 PA |
1565 | struct target_ops *target_beneath = find_target_beneath (ops); |
1566 | ||
dfd4cc63 | 1567 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 | 1568 | |
d90e17a7 PA |
1569 | target_beneath->to_mourn_inferior (target_beneath); |
1570 | ||
6c95b8df PA |
1571 | /* Delete the old thread event breakpoints. Do this after mourning |
1572 | the inferior, so that we don't try to uninsert them. */ | |
1573 | remove_thread_event_breakpoints (); | |
1574 | ||
b26a6851 | 1575 | /* Detach thread_db target ops. */ |
d90e17a7 PA |
1576 | if (!thread_db_list) |
1577 | unpush_target (ops); | |
fb0e1ba7 MK |
1578 | } |
1579 | ||
02c6c942 PP |
1580 | struct callback_data |
1581 | { | |
1582 | struct thread_db_info *info; | |
1583 | int new_threads; | |
1584 | }; | |
1585 | ||
fb0e1ba7 MK |
1586 | static int |
1587 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1588 | { | |
1589 | td_thrinfo_t ti; | |
1590 | td_err_e err; | |
39f77062 | 1591 | ptid_t ptid; |
403fe197 | 1592 | struct thread_info *tp; |
02c6c942 PP |
1593 | struct callback_data *cb_data = data; |
1594 | struct thread_db_info *info = cb_data->info; | |
fb0e1ba7 | 1595 | |
d90e17a7 | 1596 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1597 | if (err != TD_OK) |
8a3fe4f8 | 1598 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1599 | thread_db_err_str (err)); |
fb0e1ba7 | 1600 | |
a33e3959 PA |
1601 | if (ti.ti_lid == -1) |
1602 | { | |
1603 | /* A thread with kernel thread ID -1 is either a thread that | |
1604 | exited and was joined, or a thread that is being created but | |
1605 | hasn't started yet, and that is reusing the tcb/stack of a | |
1606 | thread that previously exited and was joined. (glibc marks | |
1607 | terminated and joined threads with kernel thread ID -1. See | |
1608 | glibc PR17707. */ | |
d6c146e9 PA |
1609 | if (libthread_db_debug) |
1610 | fprintf_unfiltered (gdb_stdlog, | |
1611 | "thread_db: skipping exited and " | |
1612 | "joined thread (0x%lx)\n", ti.ti_tid); | |
a33e3959 PA |
1613 | return 0; |
1614 | } | |
1615 | ||
254f582e | 1616 | if (ti.ti_tid == 0) |
4105de34 DJ |
1617 | { |
1618 | /* A thread ID of zero means that this is the main thread, but | |
1619 | glibc has not yet initialized thread-local storage and the | |
1620 | pthread library. We do not know what the thread's TID will | |
1621 | be yet. Just enable event reporting and otherwise ignore | |
1622 | it. */ | |
1623 | ||
4d062f1a PA |
1624 | /* In that case, we're not stopped in a fork syscall and don't |
1625 | need this glibc bug workaround. */ | |
1626 | info->need_stale_parent_threads_check = 0; | |
1627 | ||
c1a747c1 | 1628 | if (target_has_execution && thread_db_use_events ()) |
254f582e JK |
1629 | { |
1630 | err = info->td_thr_event_enable_p (th_p, 1); | |
1631 | if (err != TD_OK) | |
1632 | error (_("Cannot enable thread event reporting for LWP %d: %s"), | |
1633 | (int) ti.ti_lid, thread_db_err_str (err)); | |
1634 | } | |
4105de34 DJ |
1635 | |
1636 | return 0; | |
1637 | } | |
1638 | ||
4d062f1a PA |
1639 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1640 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1641 | avoid doing the work if we know we don't have to. */ | |
1642 | if (info->need_stale_parent_threads_check) | |
1643 | { | |
1644 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1645 | |
4d062f1a PA |
1646 | if (tgid != -1 && tgid != info->pid) |
1647 | return 0; | |
1648 | } | |
1649 | ||
1650 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1651 | tp = find_thread_ptid (ptid); |
fe978cb0 | 1652 | if (tp == NULL || tp->priv == NULL) |
02c6c942 PP |
1653 | { |
1654 | if (attach_thread (ptid, th_p, &ti)) | |
1655 | cb_data->new_threads += 1; | |
1656 | else | |
1657 | /* Problem attaching this thread; perhaps it exited before we | |
1658 | could attach it? | |
1659 | This could mean that the thread list inside glibc itself is in | |
1660 | inconsistent state, and libthread_db could go on looping forever | |
1661 | (observed with glibc-2.3.6). To prevent that, terminate | |
1662 | iteration: thread_db_find_new_threads_2 will retry. */ | |
1663 | return 1; | |
1664 | } | |
c1a747c1 PA |
1665 | else if (target_has_execution && !thread_db_use_events ()) |
1666 | { | |
1667 | /* Need to update this if not using the libthread_db events | |
1668 | (particularly, the TD_DEATH event). */ | |
fe978cb0 | 1669 | update_thread_state (tp->priv, &ti); |
c1a747c1 | 1670 | } |
fb0e1ba7 MK |
1671 | |
1672 | return 0; | |
1673 | } | |
1674 | ||
02c6c942 PP |
1675 | /* Helper for thread_db_find_new_threads_2. |
1676 | Returns number of new threads found. */ | |
1677 | ||
1678 | static int | |
1679 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1680 | td_err_e *errp) |
02c6c942 PP |
1681 | { |
1682 | volatile struct gdb_exception except; | |
1683 | struct callback_data data; | |
fb169834 | 1684 | td_err_e err = TD_ERR; |
02c6c942 PP |
1685 | |
1686 | data.info = info; | |
1687 | data.new_threads = 0; | |
1688 | ||
2db9a427 PA |
1689 | /* See comment in thread_db_update_thread_list. */ |
1690 | gdb_assert (!target_has_execution || thread_db_use_events ()); | |
1691 | ||
02c6c942 PP |
1692 | TRY_CATCH (except, RETURN_MASK_ERROR) |
1693 | { | |
1694 | /* Iterate over all user-space threads to discover new threads. */ | |
1695 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1696 | find_new_threads_callback, | |
1697 | &data, | |
1698 | TD_THR_ANY_STATE, | |
1699 | TD_THR_LOWEST_PRIORITY, | |
1700 | TD_SIGNO_MASK, | |
1701 | TD_THR_ANY_USER_FLAGS); | |
1702 | } | |
1703 | ||
02d868e8 | 1704 | if (libthread_db_debug) |
02c6c942 PP |
1705 | { |
1706 | if (except.reason < 0) | |
883ed13e | 1707 | exception_fprintf (gdb_stdlog, except, |
02c6c942 PP |
1708 | "Warning: find_new_threads_once: "); |
1709 | ||
883ed13e PA |
1710 | fprintf_unfiltered (gdb_stdlog, |
1711 | _("Found %d new threads in iteration %d.\n"), | |
1712 | data.new_threads, iteration); | |
02c6c942 PP |
1713 | } |
1714 | ||
1715 | if (errp != NULL) | |
1716 | *errp = err; | |
1717 | ||
1718 | return data.new_threads; | |
1719 | } | |
1720 | ||
4c28f408 | 1721 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1722 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1723 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1724 | |
fb0e1ba7 | 1725 | static void |
02c6c942 | 1726 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 | 1727 | { |
fcb44371 | 1728 | td_err_e err = TD_OK; |
d90e17a7 | 1729 | struct thread_db_info *info; |
02c6c942 | 1730 | int i, loop; |
4c28f408 | 1731 | |
dfd4cc63 | 1732 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1733 | |
4c28f408 | 1734 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1735 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1736 | |
1737 | if (until_no_new) | |
1738 | { | |
1739 | /* Require 4 successive iterations which do not find any new threads. | |
1740 | The 4 is a heuristic: there is an inherent race here, and I have | |
1741 | seen that 2 iterations in a row are not always sufficient to | |
1742 | "capture" all threads. */ | |
fcb44371 JK |
1743 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1744 | if (find_new_threads_once (info, i, &err) != 0) | |
1745 | { | |
1746 | /* Found some new threads. Restart the loop from beginning. */ | |
1747 | loop = -1; | |
1748 | } | |
02c6c942 PP |
1749 | } |
1750 | else | |
fcb44371 JK |
1751 | find_new_threads_once (info, 0, &err); |
1752 | ||
1753 | if (err != TD_OK) | |
1754 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1755 | } |
1756 | ||
02c6c942 PP |
1757 | static void |
1758 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1759 | { | |
1760 | thread_db_find_new_threads_2 (ptid, 0); | |
1761 | } | |
1762 | ||
dc146f7c VP |
1763 | static int |
1764 | update_thread_core (struct lwp_info *info, void *closure) | |
1765 | { | |
2e794194 | 1766 | info->core = linux_common_core_of_thread (info->ptid); |
dc146f7c VP |
1767 | return 0; |
1768 | } | |
02c6c942 | 1769 | |
2db9a427 PA |
1770 | /* Update the thread list using td_ta_thr_iter. */ |
1771 | ||
28439f5e | 1772 | static void |
2db9a427 | 1773 | thread_db_update_thread_list_td_ta_thr_iter (struct target_ops *ops) |
28439f5e | 1774 | { |
d90e17a7 | 1775 | struct thread_db_info *info; |
c65b3e0d | 1776 | struct inferior *inf; |
d90e17a7 | 1777 | |
e8032dde PA |
1778 | prune_threads (); |
1779 | ||
c65b3e0d PA |
1780 | ALL_INFERIORS (inf) |
1781 | { | |
1782 | struct thread_info *thread; | |
d90e17a7 | 1783 | |
c65b3e0d PA |
1784 | if (inf->pid == 0) |
1785 | continue; | |
d90e17a7 | 1786 | |
c65b3e0d PA |
1787 | info = get_thread_db_info (inf->pid); |
1788 | if (info == NULL) | |
1789 | continue; | |
1790 | ||
1791 | thread = any_live_thread_of_process (inf->pid); | |
1792 | if (thread == NULL || thread->executing) | |
1793 | continue; | |
1794 | ||
1795 | thread_db_find_new_threads_1 (thread->ptid); | |
1796 | } | |
2db9a427 PA |
1797 | } |
1798 | ||
1799 | /* Implement the to_update_thread_list target method for this | |
1800 | target. */ | |
1801 | ||
1802 | static void | |
1803 | thread_db_update_thread_list (struct target_ops *ops) | |
1804 | { | |
1805 | /* It's best to avoid td_ta_thr_iter if possible. That walks data | |
1806 | structures in the inferior's address space that may be corrupted, | |
1807 | or, if the target is running, the list may change while we walk | |
1808 | it. In the latter case, it's possible that a thread exits just | |
1809 | at the exact time that causes GDB to get stuck in an infinite | |
1810 | loop. To avoid pausing all threads whenever the core wants to | |
1811 | refresh the thread list, if the kernel supports clone events | |
1812 | (meaning we're always already attached to all LWPs), we use | |
1813 | thread_from_lwp immediately when we see an LWP stop. That uses | |
1814 | thread_db entry points that do not walk libpthread's thread list, | |
1815 | so should be safe, as well as more efficient. */ | |
1816 | if (target_has_execution && !thread_db_use_events ()) | |
1817 | ops->beneath->to_update_thread_list (ops->beneath); | |
1818 | else | |
1819 | thread_db_update_thread_list_td_ta_thr_iter (ops); | |
dc146f7c | 1820 | |
856d6f99 PA |
1821 | if (target_has_execution) |
1822 | iterate_over_lwps (minus_one_ptid /* iterate over all */, | |
1823 | update_thread_core, NULL); | |
28439f5e PA |
1824 | } |
1825 | ||
fb0e1ba7 | 1826 | static char * |
117de6a9 | 1827 | thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid) |
fb0e1ba7 | 1828 | { |
e09875d4 | 1829 | struct thread_info *thread_info = find_thread_ptid (ptid); |
117de6a9 | 1830 | struct target_ops *beneath; |
17faa917 | 1831 | |
fe978cb0 | 1832 | if (thread_info != NULL && thread_info->priv != NULL) |
fb0e1ba7 MK |
1833 | { |
1834 | static char buf[64]; | |
17faa917 | 1835 | thread_t tid; |
fb0e1ba7 | 1836 | |
fe978cb0 | 1837 | tid = thread_info->priv->tid; |
17faa917 | 1838 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
dfd4cc63 | 1839 | tid, ptid_get_lwp (ptid)); |
fb0e1ba7 MK |
1840 | |
1841 | return buf; | |
1842 | } | |
1843 | ||
117de6a9 | 1844 | beneath = find_target_beneath (ops); |
e75fdfca | 1845 | return beneath->to_pid_to_str (beneath, ptid); |
fb0e1ba7 MK |
1846 | } |
1847 | ||
28b17333 DJ |
1848 | /* Return a string describing the state of the thread specified by |
1849 | INFO. */ | |
1850 | ||
1851 | static char * | |
c15906d8 TT |
1852 | thread_db_extra_thread_info (struct target_ops *self, |
1853 | struct thread_info *info) | |
28b17333 | 1854 | { |
fe978cb0 | 1855 | if (info->priv == NULL) |
17faa917 DJ |
1856 | return NULL; |
1857 | ||
fe978cb0 | 1858 | if (info->priv->dying) |
28b17333 DJ |
1859 | return "Exiting"; |
1860 | ||
1861 | return NULL; | |
1862 | } | |
1863 | ||
b2756930 KB |
1864 | /* Get the address of the thread local variable in load module LM which |
1865 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c EZ |
1866 | |
1867 | static CORE_ADDR | |
117de6a9 PA |
1868 | thread_db_get_thread_local_address (struct target_ops *ops, |
1869 | ptid_t ptid, | |
b2756930 | 1870 | CORE_ADDR lm, |
b4acd559 | 1871 | CORE_ADDR offset) |
3f47be5c | 1872 | { |
17faa917 | 1873 | struct thread_info *thread_info; |
117de6a9 | 1874 | struct target_ops *beneath; |
17faa917 | 1875 | |
4105de34 | 1876 | /* If we have not discovered any threads yet, check now. */ |
d90e17a7 PA |
1877 | if (!have_threads (ptid)) |
1878 | thread_db_find_new_threads_1 (ptid); | |
4105de34 | 1879 | |
17faa917 | 1880 | /* Find the matching thread. */ |
e09875d4 | 1881 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1882 | |
fe978cb0 | 1883 | if (thread_info != NULL && thread_info->priv != NULL) |
3f47be5c | 1884 | { |
3f47be5c | 1885 | td_err_e err; |
00f515da | 1886 | psaddr_t address; |
d90e17a7 PA |
1887 | struct thread_db_info *info; |
1888 | ||
dfd4cc63 | 1889 | info = get_thread_db_info (ptid_get_pid (ptid)); |
3f47be5c | 1890 | |
3f47be5c | 1891 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1892 | if (lm != 0) |
1893 | { | |
1894 | /* glibc doesn't provide the needed interface. */ | |
1895 | if (!info->td_thr_tls_get_addr_p) | |
1896 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1897 | _("No TLS library support")); | |
1898 | ||
1899 | /* Note the cast through uintptr_t: this interface only works if | |
1900 | a target address fits in a psaddr_t, which is a host pointer. | |
1901 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
fe978cb0 | 1902 | err = info->td_thr_tls_get_addr_p (&thread_info->priv->th, |
5876f503 JK |
1903 | (psaddr_t)(uintptr_t) lm, |
1904 | offset, &address); | |
1905 | } | |
1906 | else | |
1907 | { | |
1908 | /* If glibc doesn't provide the needed interface throw an error | |
1909 | that LM is zero - normally cases it should not be. */ | |
1910 | if (!info->td_thr_tlsbase_p) | |
1911 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1912 | _("TLS load module not found")); | |
1913 | ||
1914 | /* This code path handles the case of -static -pthread executables: | |
1915 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1916 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1917 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1918 | The constant number 1 depends on GNU __libc_setup_tls | |
1919 | initialization of l_tls_modid to 1. */ | |
fe978cb0 | 1920 | err = info->td_thr_tlsbase_p (&thread_info->priv->th, |
5876f503 JK |
1921 | 1, &address); |
1922 | address = (char *) address + offset; | |
1923 | } | |
3f47be5c EZ |
1924 | |
1925 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1926 | /* The memory hasn't been allocated, yet. */ | |
1927 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1928 | /* Now, if libthread_db provided the initialization image's |
1929 | address, we *could* try to build a non-lvalue value from | |
1930 | the initialization image. */ | |
109c3e39 AC |
1931 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1932 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1933 | #endif |
1934 | ||
1935 | /* Something else went wrong. */ | |
1936 | if (err != TD_OK) | |
109c3e39 AC |
1937 | throw_error (TLS_GENERIC_ERROR, |
1938 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1939 | |
1940 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1941 | /* Do proper sign extension for the target. */ |
1942 | gdb_assert (exec_bfd); | |
1943 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1944 | ? (CORE_ADDR) (intptr_t) address | |
1945 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1946 | } |
1947 | ||
117de6a9 | 1948 | beneath = find_target_beneath (ops); |
f0f9ff95 | 1949 | return beneath->to_get_thread_local_address (beneath, ptid, lm, offset); |
3f47be5c EZ |
1950 | } |
1951 | ||
0ef643c8 JB |
1952 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
1953 | ||
1954 | static ptid_t | |
1e6b91a4 | 1955 | thread_db_get_ada_task_ptid (struct target_ops *self, long lwp, long thread) |
0ef643c8 | 1956 | { |
2db9a427 PA |
1957 | /* NPTL uses a 1:1 model, so the LWP id suffices. */ |
1958 | return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); | |
0ef643c8 JB |
1959 | } |
1960 | ||
4d062f1a PA |
1961 | static void |
1962 | thread_db_resume (struct target_ops *ops, | |
2ea28649 | 1963 | ptid_t ptid, int step, enum gdb_signal signo) |
4d062f1a PA |
1964 | { |
1965 | struct target_ops *beneath = find_target_beneath (ops); | |
1966 | struct thread_db_info *info; | |
1967 | ||
1968 | if (ptid_equal (ptid, minus_one_ptid)) | |
dfd4cc63 | 1969 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
4d062f1a | 1970 | else |
dfd4cc63 | 1971 | info = get_thread_db_info (ptid_get_pid (ptid)); |
4d062f1a PA |
1972 | |
1973 | /* This workaround is only needed for child fork lwps stopped in a | |
1974 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1975 | workaround can be disabled. */ | |
1976 | if (info) | |
1977 | info->need_stale_parent_threads_check = 0; | |
1978 | ||
1979 | beneath->to_resume (beneath, ptid, step, signo); | |
1980 | } | |
1981 | ||
bf88dd68 JK |
1982 | /* qsort helper function for info_auto_load_libthread_db, sort the |
1983 | thread_db_info pointers primarily by their FILENAME and secondarily by their | |
1984 | PID, both in ascending order. */ | |
1985 | ||
1986 | static int | |
1987 | info_auto_load_libthread_db_compare (const void *ap, const void *bp) | |
1988 | { | |
1989 | struct thread_db_info *a = *(struct thread_db_info **) ap; | |
1990 | struct thread_db_info *b = *(struct thread_db_info **) bp; | |
1991 | int retval; | |
1992 | ||
1993 | retval = strcmp (a->filename, b->filename); | |
1994 | if (retval) | |
1995 | return retval; | |
1996 | ||
1997 | return (a->pid > b->pid) - (a->pid - b->pid); | |
1998 | } | |
1999 | ||
2000 | /* Implement 'info auto-load libthread-db'. */ | |
2001 | ||
2002 | static void | |
2003 | info_auto_load_libthread_db (char *args, int from_tty) | |
2004 | { | |
2005 | struct ui_out *uiout = current_uiout; | |
2006 | const char *cs = args ? args : ""; | |
2007 | struct thread_db_info *info, **array; | |
2008 | unsigned info_count, unique_filenames; | |
2009 | size_t max_filename_len, max_pids_len, pids_len; | |
2010 | struct cleanup *back_to; | |
2011 | char *pids; | |
2012 | int i; | |
2013 | ||
529480d0 | 2014 | cs = skip_spaces_const (cs); |
bf88dd68 JK |
2015 | if (*cs) |
2016 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
2017 | ||
2018 | info_count = 0; | |
2019 | for (info = thread_db_list; info; info = info->next) | |
2020 | if (info->filename != NULL) | |
2021 | info_count++; | |
2022 | ||
2023 | array = xmalloc (sizeof (*array) * info_count); | |
2024 | back_to = make_cleanup (xfree, array); | |
2025 | ||
2026 | info_count = 0; | |
2027 | for (info = thread_db_list; info; info = info->next) | |
2028 | if (info->filename != NULL) | |
2029 | array[info_count++] = info; | |
2030 | ||
2031 | /* Sort ARRAY by filenames and PIDs. */ | |
2032 | ||
2033 | qsort (array, info_count, sizeof (*array), | |
2034 | info_auto_load_libthread_db_compare); | |
2035 | ||
2036 | /* Calculate the number of unique filenames (rows) and the maximum string | |
2037 | length of PIDs list for the unique filenames (columns). */ | |
2038 | ||
2039 | unique_filenames = 0; | |
2040 | max_filename_len = 0; | |
2041 | max_pids_len = 0; | |
2042 | pids_len = 0; | |
2043 | for (i = 0; i < info_count; i++) | |
2044 | { | |
2045 | int pid = array[i]->pid; | |
2046 | size_t this_pid_len; | |
2047 | ||
2048 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
2049 | this_pid_len++; | |
2050 | ||
2051 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
2052 | { | |
2053 | unique_filenames++; | |
2054 | max_filename_len = max (max_filename_len, | |
2055 | strlen (array[i]->filename)); | |
2056 | ||
2057 | if (i > 0) | |
2058 | { | |
2059 | pids_len -= strlen (", "); | |
2060 | max_pids_len = max (max_pids_len, pids_len); | |
2061 | } | |
2062 | pids_len = 0; | |
2063 | } | |
2064 | pids_len += this_pid_len + strlen (", "); | |
2065 | } | |
2066 | if (i) | |
2067 | { | |
2068 | pids_len -= strlen (", "); | |
2069 | max_pids_len = max (max_pids_len, pids_len); | |
2070 | } | |
2071 | ||
2072 | /* Table header shifted right by preceding "libthread-db: " would not match | |
2073 | its columns. */ | |
2074 | if (info_count > 0 && args == auto_load_info_scripts_pattern_nl) | |
2075 | ui_out_text (uiout, "\n"); | |
2076 | ||
2077 | make_cleanup_ui_out_table_begin_end (uiout, 2, unique_filenames, | |
2078 | "LinuxThreadDbTable"); | |
2079 | ||
2080 | ui_out_table_header (uiout, max_filename_len, ui_left, "filename", | |
2081 | "Filename"); | |
2082 | ui_out_table_header (uiout, pids_len, ui_left, "PIDs", "Pids"); | |
2083 | ui_out_table_body (uiout); | |
2084 | ||
2085 | pids = xmalloc (max_pids_len + 1); | |
2086 | make_cleanup (xfree, pids); | |
2087 | ||
2088 | /* Note I is incremented inside the cycle, not at its end. */ | |
2089 | for (i = 0; i < info_count;) | |
2090 | { | |
2091 | struct cleanup *chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); | |
2092 | char *pids_end; | |
2093 | ||
2094 | info = array[i]; | |
2095 | ui_out_field_string (uiout, "filename", info->filename); | |
2096 | pids_end = pids; | |
2097 | ||
2098 | while (i < info_count && strcmp (info->filename, array[i]->filename) == 0) | |
2099 | { | |
2100 | if (pids_end != pids) | |
2101 | { | |
2102 | *pids_end++ = ','; | |
2103 | *pids_end++ = ' '; | |
2104 | } | |
2105 | pids_end += xsnprintf (pids_end, &pids[max_pids_len + 1] - pids_end, | |
2106 | "%u", array[i]->pid); | |
2107 | gdb_assert (pids_end < &pids[max_pids_len + 1]); | |
2108 | ||
2109 | i++; | |
2110 | } | |
2111 | *pids_end = '\0'; | |
2112 | ||
2113 | ui_out_field_string (uiout, "pids", pids); | |
2114 | ||
2115 | ui_out_text (uiout, "\n"); | |
2116 | do_cleanups (chain); | |
2117 | } | |
2118 | ||
2119 | do_cleanups (back_to); | |
2120 | ||
2121 | if (info_count == 0) | |
2122 | ui_out_message (uiout, 0, _("No auto-loaded libthread-db.\n")); | |
2123 | } | |
2124 | ||
fb0e1ba7 MK |
2125 | static void |
2126 | init_thread_db_ops (void) | |
2127 | { | |
2128 | thread_db_ops.to_shortname = "multi-thread"; | |
2129 | thread_db_ops.to_longname = "multi-threaded child process."; | |
2130 | thread_db_ops.to_doc = "Threads and pthreads support."; | |
2131 | thread_db_ops.to_detach = thread_db_detach; | |
fb0e1ba7 | 2132 | thread_db_ops.to_wait = thread_db_wait; |
4d062f1a | 2133 | thread_db_ops.to_resume = thread_db_resume; |
fb0e1ba7 | 2134 | thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; |
e8032dde | 2135 | thread_db_ops.to_update_thread_list = thread_db_update_thread_list; |
fb0e1ba7 MK |
2136 | thread_db_ops.to_pid_to_str = thread_db_pid_to_str; |
2137 | thread_db_ops.to_stratum = thread_stratum; | |
2138 | thread_db_ops.to_has_thread_control = tc_schedlock; | |
3f47be5c EZ |
2139 | thread_db_ops.to_get_thread_local_address |
2140 | = thread_db_get_thread_local_address; | |
28b17333 | 2141 | thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info; |
0ef643c8 | 2142 | thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid; |
fb0e1ba7 | 2143 | thread_db_ops.to_magic = OPS_MAGIC; |
c22a2b88 TT |
2144 | |
2145 | complete_target_initialization (&thread_db_ops); | |
fb0e1ba7 MK |
2146 | } |
2147 | ||
2c0b251b PA |
2148 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
2149 | extern initialize_file_ftype _initialize_thread_db; | |
2150 | ||
fb0e1ba7 MK |
2151 | void |
2152 | _initialize_thread_db (void) | |
2153 | { | |
17a37d48 | 2154 | init_thread_db_ops (); |
17a37d48 PP |
2155 | |
2156 | /* Defer loading of libthread_db.so until inferior is running. | |
2157 | This allows gdb to load correct libthread_db for a given | |
2158 | executable -- there could be mutiple versions of glibc, | |
2159 | compiled with LinuxThreads or NPTL, and until there is | |
2160 | a running inferior, we can't tell which libthread_db is | |
1777feb0 | 2161 | the correct one to load. */ |
17a37d48 PP |
2162 | |
2163 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
2164 | ||
2165 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
2166 | class_support, | |
2167 | &libthread_db_search_path, _("\ | |
2168 | Set search path for libthread_db."), _("\ | |
2169 | Show the current search path or libthread_db."), _("\ | |
2170 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
2171 | gdb itself.\n\ |
2172 | Its value is a colon (':') separate list of directories to search.\n\ | |
2173 | Setting the search path to an empty list resets it to its default value."), | |
2174 | set_libthread_db_search_path, | |
17a37d48 PP |
2175 | NULL, |
2176 | &setlist, &showlist); | |
02d868e8 | 2177 | |
ccce17b0 YQ |
2178 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
2179 | &libthread_db_debug, _("\ | |
02d868e8 PP |
2180 | Set libthread-db debugging."), _("\ |
2181 | Show libthread-db debugging."), _("\ | |
2182 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
2183 | NULL, |
2184 | show_libthread_db_debug, | |
2185 | &setdebuglist, &showdebuglist); | |
02d868e8 | 2186 | |
bf88dd68 JK |
2187 | add_setshow_boolean_cmd ("libthread-db", class_support, |
2188 | &auto_load_thread_db, _("\ | |
2189 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
2190 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
2191 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
2192 | locations to load libthread_db compatible with the inferior.\n\ | |
2193 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
2194 | This options has security implications for untrusted inferiors."), | |
2195 | NULL, show_auto_load_thread_db, | |
2196 | auto_load_set_cmdlist_get (), | |
2197 | auto_load_show_cmdlist_get ()); | |
2198 | ||
2199 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
2200 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
2201 | Usage: info auto-load libthread-db"), | |
2202 | auto_load_info_cmdlist_get ()); | |
2203 | ||
17a37d48 PP |
2204 | /* Add ourselves to objfile event chain. */ |
2205 | observer_attach_new_objfile (thread_db_new_objfile); | |
0838fb57 DE |
2206 | |
2207 | /* Add ourselves to inferior_created event chain. | |
2208 | This is needed to handle debugging statically linked programs where | |
2209 | the new_objfile observer won't get called for libpthread. */ | |
2210 | observer_attach_inferior_created (thread_db_inferior_created); | |
fb0e1ba7 | 2211 | } |