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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
42a4f53d | 3 | Copyright (C) 1999-2019 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" |
76727919 | 38 | #include "observable.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" |
979894f2 | 45 | #include <signal.h> |
bf88dd68 | 46 | #include <ctype.h> |
9bc3a976 | 47 | #include "nat/linux-namespaces.h" |
325fac50 | 48 | #include <algorithm> |
b4987c95 | 49 | #include "common/pathstuff.h" |
5045b3d7 | 50 | #include "valprint.h" |
979894f2 | 51 | |
17faa917 DJ |
52 | /* GNU/Linux libthread_db support. |
53 | ||
54 | libthread_db is a library, provided along with libpthread.so, which | |
55 | exposes the internals of the thread library to a debugger. It | |
56 | allows GDB to find existing threads, new threads as they are | |
57 | created, thread IDs (usually, the result of pthread_self), and | |
58 | thread-local variables. | |
59 | ||
4a6ed09b PA |
60 | The libthread_db interface originates on Solaris, where it is both |
61 | more powerful and more complicated. This implementation only works | |
62 | for NPTL, the glibc threading library. It assumes that each thread | |
63 | is permanently assigned to a single light-weight process (LWP). At | |
64 | some point it also supported the older LinuxThreads library, but it | |
65 | no longer does. | |
17faa917 DJ |
66 | |
67 | libthread_db-specific information is stored in the "private" field | |
68 | of struct thread_info. When the field is NULL we do not yet have | |
69 | information about the new thread; this could be temporary (created, | |
70 | but the thread library's data structures do not reflect it yet) | |
71 | or permanent (created using clone instead of pthread_create). | |
72 | ||
73 | Process IDs managed by linux-thread-db.c match those used by | |
74 | linux-nat.c: a common PID for all processes, an LWP ID for each | |
75 | thread, and no TID. We save the TID in private. Keeping it out | |
76 | of the ptid_t prevents thread IDs changing when libpthread is | |
77 | loaded or unloaded. */ | |
78 | ||
d9f719f1 PA |
79 | static const target_info thread_db_target_info = { |
80 | "multi-thread", | |
81 | N_("multi-threaded child process."), | |
82 | N_("Threads and pthreads support.") | |
83 | }; | |
84 | ||
f6ac5f3d PA |
85 | class thread_db_target final : public target_ops |
86 | { | |
87 | public: | |
d9f719f1 PA |
88 | const target_info &info () const override |
89 | { return thread_db_target_info; } | |
f6ac5f3d | 90 | |
66b4deae PA |
91 | strata stratum () const override { return thread_stratum; } |
92 | ||
f6ac5f3d PA |
93 | void detach (inferior *, int) override; |
94 | ptid_t wait (ptid_t, struct target_waitstatus *, int) override; | |
95 | void resume (ptid_t, int, enum gdb_signal) override; | |
96 | void mourn_inferior () override; | |
97 | void update_thread_list () override; | |
98 | const char *pid_to_str (ptid_t) override; | |
99 | CORE_ADDR get_thread_local_address (ptid_t ptid, | |
100 | CORE_ADDR load_module_addr, | |
101 | CORE_ADDR offset) override; | |
102 | const char *extra_thread_info (struct thread_info *) override; | |
103 | ptid_t get_ada_task_ptid (long lwp, long thread) override; | |
104 | ||
105 | thread_info *thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
106 | int handle_len, | |
107 | inferior *inf) override; | |
108 | }; | |
109 | ||
17a37d48 PP |
110 | static char *libthread_db_search_path; |
111 | ||
bf88dd68 JK |
112 | /* Set to non-zero if thread_db auto-loading is enabled |
113 | by the "set auto-load libthread-db" command. */ | |
114 | static int auto_load_thread_db = 1; | |
115 | ||
5045b3d7 GB |
116 | /* Set to non-zero if load-time libthread_db tests have been enabled |
117 | by the "maintenence set check-libthread-db" command. */ | |
118 | static int check_thread_db_on_load = 0; | |
119 | ||
bf88dd68 JK |
120 | /* "show" command for the auto_load_thread_db configuration variable. */ |
121 | ||
122 | static void | |
123 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
124 | struct cmd_list_element *c, const char *value) | |
125 | { | |
126 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
127 | "is %s.\n"), | |
128 | value); | |
129 | } | |
130 | ||
84e578fb | 131 | static void |
eb4c3f4a | 132 | set_libthread_db_search_path (const char *ignored, int from_tty, |
84e578fb DE |
133 | struct cmd_list_element *c) |
134 | { | |
135 | if (*libthread_db_search_path == '\0') | |
136 | { | |
137 | xfree (libthread_db_search_path); | |
138 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
139 | } | |
140 | } | |
141 | ||
02d868e8 PP |
142 | /* If non-zero, print details of libthread_db processing. */ |
143 | ||
ccce17b0 | 144 | static unsigned int libthread_db_debug; |
02d868e8 PP |
145 | |
146 | static void | |
147 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
148 | struct cmd_list_element *c, const char *value) | |
149 | { | |
150 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
151 | } | |
152 | ||
8605d56e AC |
153 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
154 | threads. */ | |
fb0e1ba7 | 155 | |
fb0e1ba7 | 156 | /* This module's target vector. */ |
f6ac5f3d | 157 | static thread_db_target the_thread_db_target; |
fb0e1ba7 | 158 | |
fb0e1ba7 MK |
159 | /* Non-zero if we have determined the signals used by the threads |
160 | library. */ | |
161 | static int thread_signals; | |
162 | static sigset_t thread_stop_set; | |
163 | static sigset_t thread_print_set; | |
164 | ||
d90e17a7 PA |
165 | struct thread_db_info |
166 | { | |
167 | struct thread_db_info *next; | |
168 | ||
169 | /* Process id this object refers to. */ | |
170 | int pid; | |
171 | ||
172 | /* Handle from dlopen for libthread_db.so. */ | |
173 | void *handle; | |
174 | ||
bf88dd68 JK |
175 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
176 | HANDLE. It may be NULL for system library. */ | |
177 | char *filename; | |
178 | ||
d90e17a7 PA |
179 | /* Structure that identifies the child process for the |
180 | <proc_service.h> interface. */ | |
181 | struct ps_prochandle proc_handle; | |
182 | ||
183 | /* Connection to the libthread_db library. */ | |
184 | td_thragent_t *thread_agent; | |
185 | ||
4d062f1a PA |
186 | /* True if we need to apply the workaround for glibc/BZ5983. When |
187 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
188 | list, nptl_db returns the parent's threads in addition to the new | |
189 | (single) child thread. If this flag is set, we do extra work to | |
190 | be able to ignore such stale entries. */ | |
191 | int need_stale_parent_threads_check; | |
192 | ||
d90e17a7 | 193 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 194 | |
96e9210f PA |
195 | td_init_ftype *td_init_p; |
196 | td_ta_new_ftype *td_ta_new_p; | |
a2419b98 | 197 | td_ta_delete_ftype *td_ta_delete_p; |
96e9210f PA |
198 | td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p; |
199 | td_ta_thr_iter_ftype *td_ta_thr_iter_p; | |
96e9210f | 200 | td_thr_get_info_ftype *td_thr_get_info_p; |
96e9210f PA |
201 | td_thr_tls_get_addr_ftype *td_thr_tls_get_addr_p; |
202 | td_thr_tlsbase_ftype *td_thr_tlsbase_p; | |
d90e17a7 PA |
203 | }; |
204 | ||
205 | /* List of known processes using thread_db, and the required | |
206 | bookkeeping. */ | |
207 | struct thread_db_info *thread_db_list; | |
208 | ||
00431a78 PA |
209 | static void thread_db_find_new_threads_1 (thread_info *stopped); |
210 | static void thread_db_find_new_threads_2 (thread_info *stopped, | |
211 | bool until_no_new); | |
d90e17a7 | 212 | |
2db9a427 PA |
213 | static void check_thread_signals (void); |
214 | ||
be550b6e DE |
215 | static struct thread_info *record_thread |
216 | (struct thread_db_info *info, struct thread_info *tp, | |
217 | ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p); | |
2db9a427 | 218 | |
d90e17a7 PA |
219 | /* Add the current inferior to the list of processes using libpthread. |
220 | Return a pointer to the newly allocated object that was added to | |
221 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
222 | LIBTHREAD_DB_SO. */ | |
223 | ||
224 | static struct thread_db_info * | |
225 | add_thread_db_info (void *handle) | |
226 | { | |
8d749320 | 227 | struct thread_db_info *info = XCNEW (struct thread_db_info); |
d90e17a7 | 228 | |
e99b03dc | 229 | info->pid = inferior_ptid.pid (); |
d90e17a7 | 230 | info->handle = handle; |
856d6f99 PA |
231 | |
232 | /* The workaround works by reading from /proc/pid/status, so it is | |
233 | disabled for core files. */ | |
234 | if (target_has_execution) | |
235 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
236 | |
237 | info->next = thread_db_list; | |
238 | thread_db_list = info; | |
239 | ||
240 | return info; | |
241 | } | |
242 | ||
243 | /* Return the thread_db_info object representing the bookkeeping | |
244 | related to process PID, if any; NULL otherwise. */ | |
245 | ||
246 | static struct thread_db_info * | |
247 | get_thread_db_info (int pid) | |
248 | { | |
249 | struct thread_db_info *info; | |
250 | ||
251 | for (info = thread_db_list; info; info = info->next) | |
252 | if (pid == info->pid) | |
253 | return info; | |
254 | ||
255 | return NULL; | |
256 | } | |
257 | ||
a2419b98 PW |
258 | static const char *thread_db_err_str (td_err_e err); |
259 | ||
d90e17a7 PA |
260 | /* When PID has exited or has been detached, we no longer want to keep |
261 | track of it as using libpthread. Call this function to discard | |
262 | thread_db related info related to PID. Note that this closes | |
263 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
264 | ||
265 | static void | |
266 | delete_thread_db_info (int pid) | |
267 | { | |
268 | struct thread_db_info *info, *info_prev; | |
269 | ||
270 | info_prev = NULL; | |
271 | ||
272 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
273 | if (pid == info->pid) | |
274 | break; | |
275 | ||
276 | if (info == NULL) | |
277 | return; | |
278 | ||
a2419b98 PW |
279 | if (info->thread_agent != NULL && info->td_ta_delete_p != NULL) |
280 | { | |
281 | td_err_e err = info->td_ta_delete_p (info->thread_agent); | |
282 | ||
283 | if (err != TD_OK) | |
284 | warning (_("Cannot deregister process %d from libthread_db: %s"), | |
285 | pid, thread_db_err_str (err)); | |
286 | info->thread_agent = NULL; | |
287 | } | |
288 | ||
d90e17a7 PA |
289 | if (info->handle != NULL) |
290 | dlclose (info->handle); | |
291 | ||
bf88dd68 JK |
292 | xfree (info->filename); |
293 | ||
d90e17a7 PA |
294 | if (info_prev) |
295 | info_prev->next = info->next; | |
296 | else | |
297 | thread_db_list = info->next; | |
298 | ||
299 | xfree (info); | |
300 | } | |
fb0e1ba7 | 301 | |
5365276c DJ |
302 | /* Use "struct private_thread_info" to cache thread state. This is |
303 | a substantial optimization. */ | |
304 | ||
7aabaf9d | 305 | struct thread_db_thread_info : public private_thread_info |
fb0e1ba7 | 306 | { |
a2f23071 | 307 | /* Flag set when we see a TD_DEATH event for this thread. */ |
7aabaf9d | 308 | bool dying = false; |
a2f23071 | 309 | |
5365276c | 310 | /* Cached thread state. */ |
7aabaf9d SM |
311 | td_thrhandle_t th {}; |
312 | thread_t tid {}; | |
fb0e1ba7 | 313 | }; |
7aabaf9d SM |
314 | |
315 | static thread_db_thread_info * | |
316 | get_thread_db_thread_info (thread_info *thread) | |
317 | { | |
318 | return static_cast<thread_db_thread_info *> (thread->priv.get ()); | |
319 | } | |
21bf60fe | 320 | |
a121b7c1 | 321 | static const char * |
fb0e1ba7 MK |
322 | thread_db_err_str (td_err_e err) |
323 | { | |
324 | static char buf[64]; | |
325 | ||
326 | switch (err) | |
327 | { | |
328 | case TD_OK: | |
329 | return "generic 'call succeeded'"; | |
330 | case TD_ERR: | |
331 | return "generic error"; | |
332 | case TD_NOTHR: | |
333 | return "no thread to satisfy query"; | |
334 | case TD_NOSV: | |
335 | return "no sync handle to satisfy query"; | |
336 | case TD_NOLWP: | |
337 | return "no LWP to satisfy query"; | |
338 | case TD_BADPH: | |
339 | return "invalid process handle"; | |
340 | case TD_BADTH: | |
341 | return "invalid thread handle"; | |
342 | case TD_BADSH: | |
343 | return "invalid synchronization handle"; | |
344 | case TD_BADTA: | |
345 | return "invalid thread agent"; | |
346 | case TD_BADKEY: | |
347 | return "invalid key"; | |
348 | case TD_NOMSG: | |
349 | return "no event message for getmsg"; | |
350 | case TD_NOFPREGS: | |
351 | return "FPU register set not available"; | |
352 | case TD_NOLIBTHREAD: | |
353 | return "application not linked with libthread"; | |
354 | case TD_NOEVENT: | |
355 | return "requested event is not supported"; | |
356 | case TD_NOCAPAB: | |
357 | return "capability not available"; | |
358 | case TD_DBERR: | |
359 | return "debugger service failed"; | |
360 | case TD_NOAPLIC: | |
361 | return "operation not applicable to"; | |
362 | case TD_NOTSD: | |
363 | return "no thread-specific data for this thread"; | |
364 | case TD_MALLOC: | |
365 | return "malloc failed"; | |
366 | case TD_PARTIALREG: | |
367 | return "only part of register set was written/read"; | |
368 | case TD_NOXREGS: | |
369 | return "X register set not available for this thread"; | |
59f80f10 DJ |
370 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
371 | case TD_NOTALLOC: | |
372 | return "thread has not yet allocated TLS for given module"; | |
373 | #endif | |
374 | #ifdef THREAD_DB_HAS_TD_VERSION | |
375 | case TD_VERSION: | |
376 | return "versions of libpthread and libthread_db do not match"; | |
377 | #endif | |
378 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
379 | case TD_NOTLS: | |
380 | return "there is no TLS segment in the given module"; | |
381 | #endif | |
fb0e1ba7 MK |
382 | default: |
383 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
384 | return buf; | |
385 | } | |
386 | } | |
4105de34 | 387 | |
00431a78 PA |
388 | /* Fetch the user-level thread id of PTID. STOPPED is a stopped |
389 | thread that we can use to access memory. */ | |
fb0e1ba7 | 390 | |
be550b6e | 391 | static struct thread_info * |
00431a78 | 392 | thread_from_lwp (thread_info *stopped, ptid_t ptid) |
fb0e1ba7 | 393 | { |
fb0e1ba7 | 394 | td_thrhandle_t th; |
2db9a427 | 395 | td_thrinfo_t ti; |
fb0e1ba7 | 396 | td_err_e err; |
d90e17a7 | 397 | struct thread_db_info *info; |
2db9a427 | 398 | struct thread_info *tp; |
fb0e1ba7 | 399 | |
6cb9b55b PP |
400 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
401 | th.th_unique = 0; | |
402 | ||
17faa917 DJ |
403 | /* This ptid comes from linux-nat.c, which should always fill in the |
404 | LWP. */ | |
e38504b3 | 405 | gdb_assert (ptid.lwp () != 0); |
fb0e1ba7 | 406 | |
e99b03dc | 407 | info = get_thread_db_info (ptid.pid ()); |
d90e17a7 | 408 | |
4c28f408 | 409 | /* Access an lwp we know is stopped. */ |
00431a78 | 410 | info->proc_handle.thread = stopped; |
e38504b3 | 411 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid.lwp (), |
dfd4cc63 | 412 | &th); |
fb0e1ba7 | 413 | if (err != TD_OK) |
8a3fe4f8 | 414 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
e38504b3 | 415 | ptid.lwp (), thread_db_err_str (err)); |
fb0e1ba7 | 416 | |
2db9a427 PA |
417 | err = info->td_thr_get_info_p (&th, &ti); |
418 | if (err != TD_OK) | |
419 | error (_("thread_get_info_callback: cannot get thread info: %s"), | |
420 | thread_db_err_str (err)); | |
421 | ||
422 | /* Fill the cache. */ | |
423 | tp = find_thread_ptid (ptid); | |
be550b6e | 424 | return record_thread (info, tp, ptid, &th, &ti); |
fb0e1ba7 MK |
425 | } |
426 | \f | |
427 | ||
2db9a427 PA |
428 | /* See linux-nat.h. */ |
429 | ||
4c28f408 | 430 | int |
2db9a427 | 431 | thread_db_notice_clone (ptid_t parent, ptid_t child) |
4c28f408 | 432 | { |
d90e17a7 | 433 | struct thread_db_info *info; |
4c28f408 | 434 | |
e99b03dc | 435 | info = get_thread_db_info (child.pid ()); |
d90e17a7 PA |
436 | |
437 | if (info == NULL) | |
4c28f408 PA |
438 | return 0; |
439 | ||
00431a78 | 440 | thread_info *stopped = find_thread_ptid (parent); |
4c28f408 | 441 | |
00431a78 PA |
442 | thread_from_lwp (stopped, child); |
443 | ||
444 | /* If we do not know about the main thread's pthread info yet, this | |
445 | would be a good time to find it. */ | |
446 | thread_from_lwp (stopped, parent); | |
4c28f408 PA |
447 | return 1; |
448 | } | |
449 | ||
5220ea4c AC |
450 | static void * |
451 | verbose_dlsym (void *handle, const char *name) | |
452 | { | |
453 | void *sym = dlsym (handle, name); | |
454 | if (sym == NULL) | |
3e43a32a MS |
455 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
456 | name, dlerror ()); | |
5220ea4c AC |
457 | return sym; |
458 | } | |
459 | ||
fcb44371 JK |
460 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
461 | return 1 if this version is lower (and not equal) to | |
462 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
463 | ||
464 | static int | |
465 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
466 | { | |
3b7344d5 | 467 | struct bound_minimal_symbol version_msym; |
fcb44371 | 468 | CORE_ADDR version_addr; |
e83e4e24 | 469 | gdb::unique_xmalloc_ptr<char> version; |
fcb44371 JK |
470 | int err, got, retval = 0; |
471 | ||
472 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 473 | if (version_msym.minsym == NULL) |
fcb44371 JK |
474 | return 0; |
475 | ||
77e371c0 | 476 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
fcb44371 | 477 | got = target_read_string (version_addr, &version, 32, &err); |
e83e4e24 | 478 | if (err == 0 && memchr (version.get (), 0, got) == version.get () + got - 1) |
fcb44371 JK |
479 | { |
480 | int major, minor; | |
481 | ||
e83e4e24 | 482 | retval = (sscanf (version.get (), "%d.%d", &major, &minor) == 2 |
fcb44371 JK |
483 | && (major < ver_major_min |
484 | || (major == ver_major_min && minor < ver_minor_min))); | |
485 | } | |
fcb44371 JK |
486 | |
487 | return retval; | |
488 | } | |
489 | ||
fcb44371 JK |
490 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
491 | if appropriate. | |
456b0e24 | 492 | |
fcb44371 JK |
493 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
494 | otherwise. */ | |
495 | ||
496 | static int | |
00431a78 | 497 | thread_db_find_new_threads_silently (thread_info *stopped) |
456b0e24 | 498 | { |
456b0e24 | 499 | |
492d29ea | 500 | TRY |
456b0e24 | 501 | { |
00431a78 | 502 | thread_db_find_new_threads_2 (stopped, true); |
456b0e24 PP |
503 | } |
504 | ||
492d29ea | 505 | CATCH (except, RETURN_MASK_ERROR) |
e0881a8e | 506 | { |
fcb44371 | 507 | if (libthread_db_debug) |
883ed13e | 508 | exception_fprintf (gdb_stdlog, except, |
fcb44371 JK |
509 | "Warning: thread_db_find_new_threads_silently: "); |
510 | ||
511 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
512 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
513 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
514 | executables if td_thr_get_info is called before glibc has initialized | |
515 | itself. | |
516 | ||
517 | If the nptl bug is NOT present in the inferior and still thread_db | |
518 | reports an error return 1. It means the inferior has corrupted thread | |
519 | list and GDB should fall back only to LWPs. | |
520 | ||
521 | If the nptl bug is present in the inferior return 0 to silently ignore | |
522 | such errors, and let gdb enumerate threads again later. In such case | |
523 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
524 | corrupted. For core files it does not apply, no 'later enumeration' |
525 | is possible. */ | |
fcb44371 | 526 | |
889003ed | 527 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
528 | { |
529 | exception_fprintf (gdb_stderr, except, | |
530 | _("Warning: couldn't activate thread debugging " | |
531 | "using libthread_db: ")); | |
532 | return 1; | |
533 | } | |
e0881a8e | 534 | } |
492d29ea PA |
535 | END_CATCH |
536 | ||
fcb44371 | 537 | return 0; |
456b0e24 PP |
538 | } |
539 | ||
d90e17a7 PA |
540 | /* Lookup a library in which given symbol resides. |
541 | Note: this is looking in GDB process, not in the inferior. | |
542 | Returns library name, or NULL. */ | |
543 | ||
544 | static const char * | |
545 | dladdr_to_soname (const void *addr) | |
546 | { | |
547 | Dl_info info; | |
548 | ||
549 | if (dladdr (addr, &info) != 0) | |
550 | return info.dli_fname; | |
551 | return NULL; | |
552 | } | |
553 | ||
5045b3d7 GB |
554 | /* State for check_thread_db_callback. */ |
555 | ||
556 | struct check_thread_db_info | |
557 | { | |
558 | /* The libthread_db under test. */ | |
559 | struct thread_db_info *info; | |
560 | ||
561 | /* True if progress should be logged. */ | |
562 | bool log_progress; | |
563 | ||
564 | /* True if the callback was called. */ | |
565 | bool threads_seen; | |
566 | ||
567 | /* Name of last libthread_db function called. */ | |
568 | const char *last_call; | |
569 | ||
570 | /* Value returned by last libthread_db call. */ | |
571 | td_err_e last_result; | |
572 | }; | |
573 | ||
574 | static struct check_thread_db_info *tdb_testinfo; | |
575 | ||
576 | /* Callback for check_thread_db. */ | |
577 | ||
578 | static int | |
579 | check_thread_db_callback (const td_thrhandle_t *th, void *arg) | |
580 | { | |
581 | gdb_assert (tdb_testinfo != NULL); | |
582 | tdb_testinfo->threads_seen = true; | |
583 | ||
584 | #define LOG(fmt, args...) \ | |
585 | do \ | |
586 | { \ | |
587 | if (tdb_testinfo->log_progress) \ | |
588 | { \ | |
589 | debug_printf (fmt, ## args); \ | |
590 | gdb_flush (gdb_stdlog); \ | |
591 | } \ | |
592 | } \ | |
593 | while (0) | |
594 | ||
595 | #define CHECK_1(expr, args...) \ | |
596 | do \ | |
597 | { \ | |
598 | if (!(expr)) \ | |
599 | { \ | |
600 | LOG (" ... FAIL!\n"); \ | |
601 | error (args); \ | |
602 | } \ | |
603 | } \ | |
604 | while (0) | |
605 | ||
606 | #define CHECK(expr) \ | |
607 | CHECK_1 (expr, "(%s) == false", #expr) | |
608 | ||
609 | #define CALL_UNCHECKED(func, args...) \ | |
610 | do \ | |
611 | { \ | |
612 | tdb_testinfo->last_call = #func; \ | |
613 | tdb_testinfo->last_result \ | |
614 | = tdb_testinfo->info->func ## _p (args); \ | |
615 | } \ | |
616 | while (0) | |
617 | ||
618 | #define CHECK_CALL() \ | |
619 | CHECK_1 (tdb_testinfo->last_result == TD_OK, \ | |
620 | _("%s failed: %s"), \ | |
621 | tdb_testinfo->last_call, \ | |
622 | thread_db_err_str (tdb_testinfo->last_result)) \ | |
623 | ||
624 | #define CALL(func, args...) \ | |
625 | do \ | |
626 | { \ | |
627 | CALL_UNCHECKED (func, args); \ | |
628 | CHECK_CALL (); \ | |
629 | } \ | |
630 | while (0) | |
631 | ||
632 | LOG (" Got thread"); | |
633 | ||
634 | /* Check td_ta_thr_iter passed consistent arguments. */ | |
635 | CHECK (th != NULL); | |
636 | CHECK (arg == (void *) tdb_testinfo); | |
637 | CHECK (th->th_ta_p == tdb_testinfo->info->thread_agent); | |
638 | ||
639 | LOG (" %s", core_addr_to_string_nz ((CORE_ADDR) th->th_unique)); | |
640 | ||
641 | /* Check td_thr_get_info. */ | |
642 | td_thrinfo_t ti; | |
643 | CALL (td_thr_get_info, th, &ti); | |
644 | ||
645 | LOG (" => %d", ti.ti_lid); | |
646 | ||
647 | CHECK (ti.ti_ta_p == th->th_ta_p); | |
648 | CHECK (ti.ti_tid == (thread_t) th->th_unique); | |
649 | ||
650 | /* Check td_ta_map_lwp2thr. */ | |
651 | td_thrhandle_t th2; | |
652 | memset (&th2, 23, sizeof (td_thrhandle_t)); | |
653 | CALL_UNCHECKED (td_ta_map_lwp2thr, th->th_ta_p, ti.ti_lid, &th2); | |
654 | ||
655 | if (tdb_testinfo->last_result == TD_ERR && !target_has_execution) | |
656 | { | |
657 | /* Some platforms require execution for td_ta_map_lwp2thr. */ | |
658 | LOG (_("; can't map_lwp2thr")); | |
659 | } | |
660 | else | |
661 | { | |
662 | CHECK_CALL (); | |
663 | ||
664 | LOG (" => %s", core_addr_to_string_nz ((CORE_ADDR) th2.th_unique)); | |
665 | ||
666 | CHECK (memcmp (th, &th2, sizeof (td_thrhandle_t)) == 0); | |
667 | } | |
668 | ||
669 | /* Attempt TLS access. Assuming errno is TLS, this calls | |
670 | thread_db_get_thread_local_address, which in turn calls | |
671 | td_thr_tls_get_addr for live inferiors or td_thr_tlsbase | |
672 | for core files. This test is skipped if the thread has | |
673 | not been recorded; proceeding in that case would result | |
674 | in the test having the side-effect of noticing threads | |
675 | which seems wrong. | |
676 | ||
677 | Note that in glibc's libthread_db td_thr_tls_get_addr is | |
678 | a thin wrapper around td_thr_tlsbase; this check always | |
679 | hits the bulk of the code. | |
680 | ||
681 | Note also that we don't actually check any libthread_db | |
682 | calls are made, we just assume they were; future changes | |
683 | to how GDB accesses TLS could result in this passing | |
684 | without exercising the calls it's supposed to. */ | |
fd79271b | 685 | ptid_t ptid = ptid_t (tdb_testinfo->info->pid, ti.ti_lid, 0); |
5045b3d7 GB |
686 | struct thread_info *thread_info = find_thread_ptid (ptid); |
687 | if (thread_info != NULL && thread_info->priv != NULL) | |
688 | { | |
689 | LOG ("; errno"); | |
690 | ||
691 | scoped_restore_current_thread restore_current_thread; | |
692 | switch_to_thread (ptid); | |
693 | ||
694 | expression_up expr = parse_expression ("(int) errno"); | |
695 | struct value *val = evaluate_expression (expr.get ()); | |
696 | ||
697 | if (tdb_testinfo->log_progress) | |
698 | { | |
699 | struct value_print_options opts; | |
700 | ||
701 | get_user_print_options (&opts); | |
702 | LOG (" = "); | |
703 | value_print (val, gdb_stdlog, &opts); | |
704 | } | |
705 | } | |
706 | ||
707 | LOG (" ... OK\n"); | |
708 | ||
709 | #undef LOG | |
710 | #undef CHECK_1 | |
711 | #undef CHECK | |
712 | #undef CALL_UNCHECKED | |
713 | #undef CHECK_CALL | |
714 | #undef CALL | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
719 | /* Run integrity checks on the dlopen()ed libthread_db described by | |
720 | INFO. Returns true on success, displays a warning and returns | |
721 | false on failure. Logs progress messages to gdb_stdlog during | |
722 | the test if LOG_PROGRESS is true. */ | |
723 | ||
724 | static bool | |
725 | check_thread_db (struct thread_db_info *info, bool log_progress) | |
726 | { | |
727 | bool test_passed = true; | |
728 | ||
729 | if (log_progress) | |
730 | debug_printf (_("Running libthread_db integrity checks:\n")); | |
731 | ||
732 | /* GDB avoids using td_ta_thr_iter wherever possible (see comment | |
733 | in try_thread_db_load_1 below) so in order to test it we may | |
734 | have to locate it ourselves. */ | |
735 | td_ta_thr_iter_ftype *td_ta_thr_iter_p = info->td_ta_thr_iter_p; | |
736 | if (td_ta_thr_iter_p == NULL) | |
737 | { | |
738 | void *thr_iter = verbose_dlsym (info->handle, "td_ta_thr_iter"); | |
739 | if (thr_iter == NULL) | |
740 | return 0; | |
741 | ||
742 | td_ta_thr_iter_p = (td_ta_thr_iter_ftype *) thr_iter; | |
743 | } | |
744 | ||
745 | /* Set up the test state we share with the callback. */ | |
746 | gdb_assert (tdb_testinfo == NULL); | |
747 | struct check_thread_db_info tdb_testinfo_buf; | |
748 | tdb_testinfo = &tdb_testinfo_buf; | |
749 | ||
750 | memset (tdb_testinfo, 0, sizeof (struct check_thread_db_info)); | |
751 | tdb_testinfo->info = info; | |
752 | tdb_testinfo->log_progress = log_progress; | |
753 | ||
754 | /* td_ta_thr_iter shouldn't be used on running processes. Note that | |
755 | it's possible the inferior will stop midway through modifying one | |
756 | of its thread lists, in which case the check will spuriously | |
757 | fail. */ | |
758 | linux_stop_and_wait_all_lwps (); | |
759 | ||
760 | TRY | |
761 | { | |
762 | td_err_e err = td_ta_thr_iter_p (info->thread_agent, | |
763 | check_thread_db_callback, | |
764 | tdb_testinfo, | |
765 | TD_THR_ANY_STATE, | |
766 | TD_THR_LOWEST_PRIORITY, | |
767 | TD_SIGNO_MASK, | |
768 | TD_THR_ANY_USER_FLAGS); | |
769 | ||
770 | if (err != TD_OK) | |
771 | error (_("td_ta_thr_iter failed: %s"), thread_db_err_str (err)); | |
772 | ||
773 | if (!tdb_testinfo->threads_seen) | |
774 | error (_("no threads seen")); | |
775 | } | |
776 | CATCH (except, RETURN_MASK_ERROR) | |
777 | { | |
778 | if (warning_pre_print) | |
779 | fputs_unfiltered (warning_pre_print, gdb_stderr); | |
780 | ||
781 | exception_fprintf (gdb_stderr, except, | |
782 | _("libthread_db integrity checks failed: ")); | |
783 | ||
784 | test_passed = false; | |
785 | } | |
786 | END_CATCH | |
787 | ||
788 | if (test_passed && log_progress) | |
789 | debug_printf (_("libthread_db integrity checks passed.\n")); | |
790 | ||
791 | tdb_testinfo = NULL; | |
792 | ||
793 | linux_unstop_all_lwps (); | |
794 | ||
795 | return test_passed; | |
796 | } | |
797 | ||
2471d008 | 798 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
799 | Return 1 on success. |
800 | Failure could happen if libthread_db does not have symbols we expect, | |
801 | or when it refuses to work with the current inferior (e.g. due to | |
802 | version mismatch between libthread_db and libpthread). */ | |
803 | ||
804 | static int | |
d90e17a7 | 805 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
806 | { |
807 | td_err_e err; | |
808 | ||
809 | /* Initialize pointers to the dynamic library functions we will use. | |
810 | Essential functions first. */ | |
811 | ||
96e9210f PA |
812 | #define TDB_VERBOSE_DLSYM(info, func) \ |
813 | info->func ## _p = (func ## _ftype *) verbose_dlsym (info->handle, #func) | |
814 | ||
815 | #define TDB_DLSYM(info, func) \ | |
816 | info->func ## _p = (func ## _ftype *) dlsym (info->handle, #func) | |
817 | ||
818 | #define CHK(a) \ | |
819 | do \ | |
820 | { \ | |
821 | if ((a) == NULL) \ | |
822 | return 0; \ | |
823 | } while (0) | |
824 | ||
825 | CHK (TDB_VERBOSE_DLSYM (info, td_init)); | |
17a37d48 | 826 | |
d90e17a7 | 827 | err = info->td_init_p (); |
17a37d48 PP |
828 | if (err != TD_OK) |
829 | { | |
3e43a32a MS |
830 | warning (_("Cannot initialize libthread_db: %s"), |
831 | thread_db_err_str (err)); | |
17a37d48 PP |
832 | return 0; |
833 | } | |
834 | ||
96e9210f | 835 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_new)); |
17a37d48 PP |
836 | |
837 | /* Initialize the structure that identifies the child process. */ | |
00431a78 | 838 | info->proc_handle.thread = inferior_thread (); |
17a37d48 PP |
839 | |
840 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 841 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
842 | if (err != TD_OK) |
843 | { | |
02d868e8 | 844 | if (libthread_db_debug) |
883ed13e PA |
845 | fprintf_unfiltered (gdb_stdlog, _("td_ta_new failed: %s\n"), |
846 | thread_db_err_str (err)); | |
17a37d48 PP |
847 | else |
848 | switch (err) | |
849 | { | |
850 | case TD_NOLIBTHREAD: | |
851 | #ifdef THREAD_DB_HAS_TD_VERSION | |
852 | case TD_VERSION: | |
853 | #endif | |
854 | /* The errors above are not unexpected and silently ignored: | |
855 | they just mean we haven't found correct version of | |
856 | libthread_db yet. */ | |
857 | break; | |
858 | default: | |
859 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
860 | } | |
861 | return 0; | |
862 | } | |
863 | ||
96e9210f PA |
864 | /* These are essential. */ |
865 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_map_lwp2thr)); | |
96e9210f | 866 | CHK (TDB_VERBOSE_DLSYM (info, td_thr_get_info)); |
17a37d48 PP |
867 | |
868 | /* These are not essential. */ | |
96e9210f PA |
869 | TDB_DLSYM (info, td_thr_tls_get_addr); |
870 | TDB_DLSYM (info, td_thr_tlsbase); | |
a2419b98 | 871 | TDB_DLSYM (info, td_ta_delete); |
96e9210f | 872 | |
2db9a427 PA |
873 | /* It's best to avoid td_ta_thr_iter if possible. That walks data |
874 | structures in the inferior's address space that may be corrupted, | |
875 | or, if the target is running, may change while we walk them. If | |
876 | there's execution (and /proc is mounted), then we're already | |
877 | attached to all LWPs. Use thread_from_lwp, which uses | |
878 | td_ta_map_lwp2thr instead, which does not walk the thread list. | |
879 | ||
880 | td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that | |
881 | currently on core targets, as it uses ptrace directly. */ | |
882 | if (target_has_execution | |
e99b03dc | 883 | && linux_proc_task_list_dir_exists (inferior_ptid.pid ())) |
1eb2dbb8 PA |
884 | info->td_ta_thr_iter_p = NULL; |
885 | else | |
886 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter)); | |
887 | ||
888 | #undef TDB_VERBOSE_DLSYM | |
889 | #undef TDB_DLSYM | |
890 | #undef CHK | |
891 | ||
5045b3d7 GB |
892 | /* Run integrity checks if requested. */ |
893 | if (check_thread_db_on_load) | |
894 | { | |
895 | if (!check_thread_db (info, libthread_db_debug)) | |
896 | return 0; | |
897 | } | |
898 | ||
1eb2dbb8 | 899 | if (info->td_ta_thr_iter_p == NULL) |
2db9a427 PA |
900 | { |
901 | struct lwp_info *lp; | |
e99b03dc | 902 | int pid = inferior_ptid.pid (); |
00431a78 | 903 | thread_info *curr_thread = inferior_thread (); |
2db9a427 PA |
904 | |
905 | linux_stop_and_wait_all_lwps (); | |
906 | ||
907 | ALL_LWPS (lp) | |
e99b03dc | 908 | if (lp->ptid.pid () == pid) |
00431a78 | 909 | thread_from_lwp (curr_thread, lp->ptid); |
2db9a427 PA |
910 | |
911 | linux_unstop_all_lwps (); | |
912 | } | |
00431a78 | 913 | else if (thread_db_find_new_threads_silently (inferior_thread ()) != 0) |
fcb44371 JK |
914 | { |
915 | /* Even if libthread_db initializes, if the thread list is | |
916 | corrupted, we'd not manage to list any threads. Better reject this | |
917 | thread_db, and fall back to at least listing LWPs. */ | |
918 | return 0; | |
919 | } | |
920 | ||
17a37d48 PP |
921 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
922 | ||
883ed13e | 923 | if (*libthread_db_search_path || libthread_db_debug) |
d90e17a7 | 924 | { |
883ed13e | 925 | struct ui_file *file; |
d90e17a7 | 926 | const char *library; |
17a37d48 | 927 | |
f8708a14 | 928 | library = dladdr_to_soname ((const void *) *info->td_ta_new_p); |
d90e17a7 PA |
929 | if (library == NULL) |
930 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 931 | |
883ed13e PA |
932 | /* If we'd print this to gdb_stdout when debug output is |
933 | disabled, still print it to gdb_stdout if debug output is | |
934 | enabled. User visible output should not depend on debug | |
935 | settings. */ | |
936 | file = *libthread_db_search_path != '\0' ? gdb_stdout : gdb_stdlog; | |
937 | fprintf_unfiltered (file, _("Using host libthread_db library \"%s\".\n"), | |
938 | library); | |
d90e17a7 | 939 | } |
17a37d48 | 940 | |
d90e17a7 PA |
941 | /* The thread library was detected. Activate the thread_db target |
942 | if this is the first process using it. */ | |
943 | if (thread_db_list->next == NULL) | |
f6ac5f3d | 944 | push_target (&the_thread_db_target); |
17a37d48 | 945 | |
d90e17a7 | 946 | return 1; |
17a37d48 PP |
947 | } |
948 | ||
949 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
950 | relative, or just LIBTHREAD_DB. */ | |
951 | ||
952 | static int | |
fde4f8ed | 953 | try_thread_db_load (const char *library, int check_auto_load_safe) |
17a37d48 PP |
954 | { |
955 | void *handle; | |
d90e17a7 | 956 | struct thread_db_info *info; |
17a37d48 | 957 | |
02d868e8 | 958 | if (libthread_db_debug) |
883ed13e PA |
959 | fprintf_unfiltered (gdb_stdlog, |
960 | _("Trying host libthread_db library: %s.\n"), | |
961 | library); | |
fde4f8ed JK |
962 | |
963 | if (check_auto_load_safe) | |
964 | { | |
965 | if (access (library, R_OK) != 0) | |
966 | { | |
967 | /* Do not print warnings by file_is_auto_load_safe if the library does | |
968 | not exist at this place. */ | |
969 | if (libthread_db_debug) | |
883ed13e PA |
970 | fprintf_unfiltered (gdb_stdlog, _("open failed: %s.\n"), |
971 | safe_strerror (errno)); | |
fde4f8ed JK |
972 | return 0; |
973 | } | |
974 | ||
975 | if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db " | |
976 | "library \"%s\" from explicit " | |
977 | "directory.\n"), | |
978 | library)) | |
979 | return 0; | |
980 | } | |
981 | ||
17a37d48 PP |
982 | handle = dlopen (library, RTLD_NOW); |
983 | if (handle == NULL) | |
984 | { | |
02d868e8 | 985 | if (libthread_db_debug) |
883ed13e | 986 | fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ()); |
17a37d48 PP |
987 | return 0; |
988 | } | |
989 | ||
02d868e8 | 990 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
991 | { |
992 | void *td_init; | |
993 | ||
994 | td_init = dlsym (handle, "td_init"); | |
995 | if (td_init != NULL) | |
996 | { | |
997 | const char *const libpath = dladdr_to_soname (td_init); | |
998 | ||
999 | if (libpath != NULL) | |
883ed13e | 1000 | fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"), |
17a37d48 PP |
1001 | library, libpath); |
1002 | } | |
1003 | } | |
1004 | ||
d90e17a7 PA |
1005 | info = add_thread_db_info (handle); |
1006 | ||
bf88dd68 JK |
1007 | /* Do not save system library name, that one is always trusted. */ |
1008 | if (strchr (library, '/') != NULL) | |
14278e1f | 1009 | info->filename = gdb_realpath (library).release (); |
bf88dd68 | 1010 | |
d90e17a7 | 1011 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
1012 | return 1; |
1013 | ||
1014 | /* This library "refused" to work on current inferior. */ | |
e99b03dc | 1015 | delete_thread_db_info (inferior_ptid.pid ()); |
17a37d48 PP |
1016 | return 0; |
1017 | } | |
1018 | ||
290351b8 | 1019 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
1020 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
1021 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
1022 | The result is true for success. */ |
1023 | ||
1024 | static int | |
e6712ff1 | 1025 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 1026 | { |
4262abfb | 1027 | const char *obj_name = objfile_name (obj); |
290351b8 | 1028 | |
4262abfb | 1029 | if (obj_name[0] != '/') |
290351b8 DE |
1030 | { |
1031 | warning (_("Expected absolute pathname for libpthread in the" | |
4262abfb | 1032 | " inferior, but got %s."), obj_name); |
290351b8 DE |
1033 | return 0; |
1034 | } | |
05386e9e | 1035 | |
9b292f68 TT |
1036 | std::string path = obj_name; |
1037 | size_t cp = path.rfind ('/'); | |
05386e9e | 1038 | /* This should at minimum hit the first character. */ |
9b292f68 TT |
1039 | gdb_assert (cp != std::string::npos); |
1040 | path.resize (cp + 1); | |
e6712ff1 | 1041 | if (subdir != NULL) |
9b292f68 TT |
1042 | path = path + subdir + "/"; |
1043 | path += LIBTHREAD_DB_SO; | |
bccbefd2 | 1044 | |
9b292f68 | 1045 | return try_thread_db_load (path.c_str (), 1); |
290351b8 DE |
1046 | } |
1047 | ||
98a5dd13 | 1048 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
1049 | Look for libthread_db in directory(libpthread)/SUBDIR. |
1050 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
1051 | The result is true for success. */ |
1052 | ||
1053 | static int | |
e6712ff1 | 1054 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 | 1055 | { |
bf88dd68 JK |
1056 | if (!auto_load_thread_db) |
1057 | return 0; | |
1058 | ||
2030c079 | 1059 | for (objfile *obj : current_program_space->objfiles ()) |
4262abfb | 1060 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 1061 | { |
e6712ff1 | 1062 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
290351b8 DE |
1063 | return 1; |
1064 | ||
1065 | /* We may have found the separate-debug-info version of | |
1066 | libpthread, and it may live in a directory without a matching | |
1067 | libthread_db. */ | |
1068 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
1069 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
1070 | subdir); | |
290351b8 | 1071 | |
98a5dd13 DE |
1072 | return 0; |
1073 | } | |
1074 | ||
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | /* Handle $sdir in libthread-db-search-path. | |
1079 | Look for libthread_db in the system dirs, or wherever a plain | |
1080 | dlopen(file_without_path) will look. | |
1081 | The result is true for success. */ | |
1082 | ||
1083 | static int | |
1084 | try_thread_db_load_from_sdir (void) | |
1085 | { | |
fde4f8ed | 1086 | return try_thread_db_load (LIBTHREAD_DB_SO, 0); |
98a5dd13 DE |
1087 | } |
1088 | ||
1089 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
1090 | The result is true for success. */ | |
1091 | ||
1092 | static int | |
1093 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
1094 | { | |
bf88dd68 JK |
1095 | if (!auto_load_thread_db) |
1096 | return 0; | |
1097 | ||
9b292f68 | 1098 | std::string path = std::string (dir, dir_len) + "/" + LIBTHREAD_DB_SO; |
bccbefd2 | 1099 | |
9b292f68 | 1100 | return try_thread_db_load (path.c_str (), 1); |
98a5dd13 DE |
1101 | } |
1102 | ||
17a37d48 | 1103 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
1104 | to work on current inferior. |
1105 | The result is true for success. */ | |
17a37d48 PP |
1106 | |
1107 | static int | |
1108 | thread_db_load_search (void) | |
1109 | { | |
e80aaf61 | 1110 | int rc = 0; |
17a37d48 | 1111 | |
e80aaf61 SM |
1112 | std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec |
1113 | = dirnames_to_char_ptr_vec (libthread_db_search_path); | |
e6712ff1 | 1114 | |
e80aaf61 | 1115 | for (const gdb::unique_xmalloc_ptr<char> &this_dir_up : dir_vec) |
17a37d48 | 1116 | { |
e80aaf61 | 1117 | const char *this_dir = this_dir_up.get (); |
e6712ff1 | 1118 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 1119 | size_t this_dir_len; |
e0881a8e | 1120 | |
e6712ff1 | 1121 | this_dir_len = strlen (this_dir); |
17a37d48 | 1122 | |
e6712ff1 DE |
1123 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
1124 | && (this_dir[pdir_len] == '\0' | |
1125 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 1126 | { |
9b292f68 | 1127 | const char *subdir = NULL; |
e6712ff1 | 1128 | |
9b292f68 | 1129 | std::string subdir_holder; |
e6712ff1 | 1130 | if (this_dir[pdir_len] == '/') |
98a5dd13 | 1131 | { |
9b292f68 TT |
1132 | subdir_holder = std::string (this_dir + pdir_len + 1); |
1133 | subdir = subdir_holder.c_str (); | |
98a5dd13 | 1134 | } |
e6712ff1 | 1135 | rc = try_thread_db_load_from_pdir (subdir); |
e6712ff1 DE |
1136 | if (rc) |
1137 | break; | |
17a37d48 | 1138 | } |
e6712ff1 | 1139 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
1140 | { |
1141 | if (try_thread_db_load_from_sdir ()) | |
1142 | { | |
1143 | rc = 1; | |
1144 | break; | |
1145 | } | |
1146 | } | |
1147 | else | |
17a37d48 | 1148 | { |
98a5dd13 DE |
1149 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
1150 | { | |
1151 | rc = 1; | |
1152 | break; | |
1153 | } | |
17a37d48 PP |
1154 | } |
1155 | } | |
98a5dd13 DE |
1156 | |
1157 | if (libthread_db_debug) | |
883ed13e PA |
1158 | fprintf_unfiltered (gdb_stdlog, |
1159 | _("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1160 | return rc; |
1161 | } | |
1162 | ||
98a5dd13 DE |
1163 | /* Return non-zero if the inferior has a libpthread. */ |
1164 | ||
1165 | static int | |
1166 | has_libpthread (void) | |
1167 | { | |
2030c079 | 1168 | for (objfile *obj : current_program_space->objfiles ()) |
4262abfb | 1169 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 DE |
1170 | return 1; |
1171 | ||
1172 | return 0; | |
1173 | } | |
1174 | ||
17a37d48 | 1175 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1176 | Return 1 on success. */ |
17a37d48 PP |
1177 | |
1178 | static int | |
1179 | thread_db_load (void) | |
1180 | { | |
d90e17a7 | 1181 | struct thread_db_info *info; |
17a37d48 | 1182 | |
e99b03dc | 1183 | info = get_thread_db_info (inferior_ptid.pid ()); |
d90e17a7 PA |
1184 | |
1185 | if (info != NULL) | |
17a37d48 PP |
1186 | return 1; |
1187 | ||
856d6f99 PA |
1188 | /* Don't attempt to use thread_db on executables not running |
1189 | yet. */ | |
1190 | if (!target_has_registers) | |
17a37d48 PP |
1191 | return 0; |
1192 | ||
1193 | /* Don't attempt to use thread_db for remote targets. */ | |
f6ac5f3d | 1194 | if (!(target_can_run () || core_bfd)) |
17a37d48 PP |
1195 | return 0; |
1196 | ||
1197 | if (thread_db_load_search ()) | |
1198 | return 1; | |
1199 | ||
98a5dd13 DE |
1200 | /* We couldn't find a libthread_db. |
1201 | If the inferior has a libpthread warn the user. */ | |
1202 | if (has_libpthread ()) | |
1203 | { | |
1204 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1205 | " library, thread debugging will not be available.")); | |
1206 | return 0; | |
17a37d48 | 1207 | } |
98a5dd13 | 1208 | |
17a37d48 PP |
1209 | /* Either this executable isn't using libpthread at all, or it is |
1210 | statically linked. Since we can't easily distinguish these two cases, | |
1211 | no warning is issued. */ | |
1212 | return 0; | |
1213 | } | |
1214 | ||
fb0e1ba7 MK |
1215 | static void |
1216 | check_thread_signals (void) | |
1217 | { | |
21bf60fe | 1218 | if (!thread_signals) |
fb0e1ba7 MK |
1219 | { |
1220 | sigset_t mask; | |
1221 | int i; | |
1222 | ||
669211f5 | 1223 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1224 | sigemptyset (&thread_stop_set); |
1225 | sigemptyset (&thread_print_set); | |
1226 | ||
b9569773 | 1227 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1228 | { |
1229 | if (sigismember (&mask, i)) | |
1230 | { | |
2ea28649 | 1231 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 1232 | sigaddset (&thread_stop_set, i); |
2ea28649 | 1233 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
1234 | sigaddset (&thread_print_set, i); |
1235 | thread_signals = 1; | |
1236 | } | |
1237 | } | |
1238 | } | |
fb0e1ba7 MK |
1239 | } |
1240 | ||
0ec9a092 DJ |
1241 | /* Check whether thread_db is usable. This function is called when |
1242 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1243 | and when new shared libraries are loaded into a running process. */ | |
1244 | ||
1245 | void | |
1246 | check_for_thread_db (void) | |
fb0e1ba7 | 1247 | { |
b5057acd | 1248 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1249 | if (!thread_db_load ()) |
b5057acd | 1250 | return; |
0ec9a092 DJ |
1251 | } |
1252 | ||
0838fb57 DE |
1253 | /* This function is called via the new_objfile observer. */ |
1254 | ||
0ec9a092 DJ |
1255 | static void |
1256 | thread_db_new_objfile (struct objfile *objfile) | |
1257 | { | |
d90e17a7 PA |
1258 | /* This observer must always be called with inferior_ptid set |
1259 | correctly. */ | |
1260 | ||
0838fb57 | 1261 | if (objfile != NULL |
fcb44371 | 1262 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 1263 | loaded (and notified without successful thread_db initialization) |
76727919 | 1264 | the time gdb::observers::new_objfile.notify is called for the library itself. |
fcb44371 JK |
1265 | Static executables have their separate debug info loaded already |
1266 | before the inferior has started. */ | |
1267 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1268 | /* Only check for thread_db if we loaded libpthread, |
1269 | or if this is the main symbol file. | |
1270 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1271 | a statically linked executable AND the symbol file is specified AFTER | |
1272 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1273 | For dynamically linked executables, libpthread can be near the end | |
1274 | of the list of shared libraries to load, and in an app of several | |
1275 | thousand shared libraries, this can otherwise be painful. */ | |
1276 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 1277 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 1278 | check_for_thread_db (); |
fb0e1ba7 MK |
1279 | } |
1280 | ||
015de688 DC |
1281 | static void |
1282 | check_pid_namespace_match (void) | |
1283 | { | |
1284 | /* Check is only relevant for local targets targets. */ | |
f6ac5f3d | 1285 | if (target_can_run ()) |
015de688 DC |
1286 | { |
1287 | /* If the child is in a different PID namespace, its idea of its | |
1288 | PID will differ from our idea of its PID. When we scan the | |
1289 | child's thread list, we'll mistakenly think it has no threads | |
1290 | since the thread PID fields won't match the PID we give to | |
1291 | libthread_db. */ | |
e99b03dc | 1292 | if (!linux_ns_same (inferior_ptid.pid (), LINUX_NS_PID)) |
015de688 DC |
1293 | { |
1294 | warning (_ ("Target and debugger are in different PID " | |
1295 | "namespaces; thread lists and other data are " | |
708bf0a1 JK |
1296 | "likely unreliable. " |
1297 | "Connect to gdbserver inside the container.")); | |
015de688 | 1298 | } |
015de688 DC |
1299 | } |
1300 | } | |
1301 | ||
0838fb57 DE |
1302 | /* This function is called via the inferior_created observer. |
1303 | This handles the case of debugging statically linked executables. */ | |
1304 | ||
1305 | static void | |
1306 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1307 | { | |
015de688 | 1308 | check_pid_namespace_match (); |
0838fb57 DE |
1309 | check_for_thread_db (); |
1310 | } | |
1311 | ||
c1a747c1 PA |
1312 | /* Update the thread's state (what's displayed in "info threads"), |
1313 | from libthread_db thread state information. */ | |
1314 | ||
1315 | static void | |
7aabaf9d | 1316 | update_thread_state (thread_db_thread_info *priv, |
c1a747c1 PA |
1317 | const td_thrinfo_t *ti_p) |
1318 | { | |
fe978cb0 PA |
1319 | priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN |
1320 | || ti_p->ti_state == TD_THR_ZOMBIE); | |
c1a747c1 PA |
1321 | } |
1322 | ||
2db9a427 | 1323 | /* Record a new thread in GDB's thread list. Creates the thread's |
be550b6e DE |
1324 | private info. If TP is NULL or TP is marked as having exited, |
1325 | creates a new thread. Otherwise, uses TP. */ | |
2db9a427 | 1326 | |
be550b6e | 1327 | static struct thread_info * |
2db9a427 PA |
1328 | record_thread (struct thread_db_info *info, |
1329 | struct thread_info *tp, | |
1330 | ptid_t ptid, const td_thrhandle_t *th_p, | |
1331 | const td_thrinfo_t *ti_p) | |
1332 | { | |
2db9a427 PA |
1333 | /* A thread ID of zero may mean the thread library has not |
1334 | initialized yet. Leave private == NULL until the thread library | |
1335 | has initialized. */ | |
1336 | if (ti_p->ti_tid == 0) | |
be550b6e | 1337 | return tp; |
2db9a427 | 1338 | |
17faa917 | 1339 | /* Construct the thread's private data. */ |
7aabaf9d | 1340 | thread_db_thread_info *priv = new thread_db_thread_info; |
17faa917 | 1341 | |
fe978cb0 PA |
1342 | priv->th = *th_p; |
1343 | priv->tid = ti_p->ti_tid; | |
1344 | update_thread_state (priv, ti_p); | |
17faa917 | 1345 | |
4eec2deb PA |
1346 | /* Add the thread to GDB's thread list. If we already know about a |
1347 | thread with this PTID, but it's marked exited, then the kernel | |
1348 | reused the tid of an old thread. */ | |
1349 | if (tp == NULL || tp->state == THREAD_EXITED) | |
fe978cb0 | 1350 | tp = add_thread_with_info (ptid, priv); |
17faa917 | 1351 | else |
7aabaf9d | 1352 | tp->priv.reset (priv); |
5365276c | 1353 | |
2db9a427 PA |
1354 | if (target_has_execution) |
1355 | check_thread_signals (); | |
be550b6e DE |
1356 | |
1357 | return tp; | |
fb0e1ba7 MK |
1358 | } |
1359 | ||
f6ac5f3d PA |
1360 | void |
1361 | thread_db_target::detach (inferior *inf, int from_tty) | |
fb0e1ba7 | 1362 | { |
bc09b0c1 | 1363 | delete_thread_db_info (inf->pid); |
4105de34 | 1364 | |
d6ca69cd | 1365 | beneath ()->detach (inf, from_tty); |
d90e17a7 PA |
1366 | |
1367 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1368 | ||
1369 | /* If there are no more processes using libpthread, detach the | |
1370 | thread_db target ops. */ | |
1371 | if (!thread_db_list) | |
f6ac5f3d | 1372 | unpush_target (this); |
fb0e1ba7 MK |
1373 | } |
1374 | ||
f6ac5f3d PA |
1375 | ptid_t |
1376 | thread_db_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
1377 | int options) | |
fb0e1ba7 | 1378 | { |
d90e17a7 | 1379 | struct thread_db_info *info; |
117de6a9 | 1380 | |
d6ca69cd | 1381 | ptid = beneath ()->wait (ptid, ourstatus, options); |
fb0e1ba7 | 1382 | |
aa01bd36 PA |
1383 | switch (ourstatus->kind) |
1384 | { | |
1385 | case TARGET_WAITKIND_IGNORE: | |
1386 | case TARGET_WAITKIND_EXITED: | |
1387 | case TARGET_WAITKIND_THREAD_EXITED: | |
1388 | case TARGET_WAITKIND_SIGNALLED: | |
1389 | return ptid; | |
1390 | } | |
fb0e1ba7 | 1391 | |
e99b03dc | 1392 | info = get_thread_db_info (ptid.pid ()); |
d90e17a7 PA |
1393 | |
1394 | /* If this process isn't using thread_db, we're done. */ | |
1395 | if (info == NULL) | |
1396 | return ptid; | |
1397 | ||
3f64f7b1 DJ |
1398 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1399 | { | |
d90e17a7 PA |
1400 | /* New image, it may or may not end up using thread_db. Assume |
1401 | not unless we find otherwise. */ | |
e99b03dc | 1402 | delete_thread_db_info (ptid.pid ()); |
d90e17a7 | 1403 | if (!thread_db_list) |
f6ac5f3d | 1404 | unpush_target (&the_thread_db_target); |
3f64f7b1 | 1405 | |
49fd4a42 | 1406 | return ptid; |
3f64f7b1 DJ |
1407 | } |
1408 | ||
2db9a427 | 1409 | /* Fill in the thread's user-level thread id and status. */ |
00431a78 | 1410 | thread_from_lwp (find_thread_ptid (ptid), ptid); |
fb0e1ba7 | 1411 | |
b9b5d7ea | 1412 | return ptid; |
fb0e1ba7 MK |
1413 | } |
1414 | ||
f6ac5f3d PA |
1415 | void |
1416 | thread_db_target::mourn_inferior () | |
fb0e1ba7 | 1417 | { |
e99b03dc | 1418 | delete_thread_db_info (inferior_ptid.pid ()); |
fb0e1ba7 | 1419 | |
d6ca69cd | 1420 | beneath ()->mourn_inferior (); |
d90e17a7 | 1421 | |
b26a6851 | 1422 | /* Detach thread_db target ops. */ |
d90e17a7 | 1423 | if (!thread_db_list) |
f6ac5f3d | 1424 | unpush_target (&the_thread_db_target); |
fb0e1ba7 MK |
1425 | } |
1426 | ||
02c6c942 PP |
1427 | struct callback_data |
1428 | { | |
1429 | struct thread_db_info *info; | |
1430 | int new_threads; | |
1431 | }; | |
1432 | ||
fb0e1ba7 MK |
1433 | static int |
1434 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1435 | { | |
1436 | td_thrinfo_t ti; | |
1437 | td_err_e err; | |
403fe197 | 1438 | struct thread_info *tp; |
9a3c8263 | 1439 | struct callback_data *cb_data = (struct callback_data *) data; |
02c6c942 | 1440 | struct thread_db_info *info = cb_data->info; |
fb0e1ba7 | 1441 | |
d90e17a7 | 1442 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1443 | if (err != TD_OK) |
8a3fe4f8 | 1444 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1445 | thread_db_err_str (err)); |
fb0e1ba7 | 1446 | |
a33e3959 PA |
1447 | if (ti.ti_lid == -1) |
1448 | { | |
1449 | /* A thread with kernel thread ID -1 is either a thread that | |
1450 | exited and was joined, or a thread that is being created but | |
1451 | hasn't started yet, and that is reusing the tcb/stack of a | |
1452 | thread that previously exited and was joined. (glibc marks | |
1453 | terminated and joined threads with kernel thread ID -1. See | |
1454 | glibc PR17707. */ | |
d6c146e9 PA |
1455 | if (libthread_db_debug) |
1456 | fprintf_unfiltered (gdb_stdlog, | |
1457 | "thread_db: skipping exited and " | |
d41401ac DE |
1458 | "joined thread (0x%lx)\n", |
1459 | (unsigned long) ti.ti_tid); | |
a33e3959 PA |
1460 | return 0; |
1461 | } | |
1462 | ||
254f582e | 1463 | if (ti.ti_tid == 0) |
4105de34 DJ |
1464 | { |
1465 | /* A thread ID of zero means that this is the main thread, but | |
1466 | glibc has not yet initialized thread-local storage and the | |
1467 | pthread library. We do not know what the thread's TID will | |
c2c2a31f | 1468 | be yet. */ |
4105de34 | 1469 | |
4d062f1a PA |
1470 | /* In that case, we're not stopped in a fork syscall and don't |
1471 | need this glibc bug workaround. */ | |
1472 | info->need_stale_parent_threads_check = 0; | |
1473 | ||
4105de34 DJ |
1474 | return 0; |
1475 | } | |
1476 | ||
4d062f1a PA |
1477 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1478 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1479 | avoid doing the work if we know we don't have to. */ | |
1480 | if (info->need_stale_parent_threads_check) | |
1481 | { | |
1482 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1483 | |
4d062f1a PA |
1484 | if (tgid != -1 && tgid != info->pid) |
1485 | return 0; | |
1486 | } | |
1487 | ||
00431a78 | 1488 | ptid_t ptid (info->pid, ti.ti_lid); |
e09875d4 | 1489 | tp = find_thread_ptid (ptid); |
fe978cb0 | 1490 | if (tp == NULL || tp->priv == NULL) |
60269a4a | 1491 | record_thread (info, tp, ptid, th_p, &ti); |
fb0e1ba7 MK |
1492 | |
1493 | return 0; | |
1494 | } | |
1495 | ||
02c6c942 PP |
1496 | /* Helper for thread_db_find_new_threads_2. |
1497 | Returns number of new threads found. */ | |
1498 | ||
1499 | static int | |
1500 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1501 | td_err_e *errp) |
02c6c942 | 1502 | { |
02c6c942 | 1503 | struct callback_data data; |
fb169834 | 1504 | td_err_e err = TD_ERR; |
02c6c942 PP |
1505 | |
1506 | data.info = info; | |
1507 | data.new_threads = 0; | |
1508 | ||
2db9a427 | 1509 | /* See comment in thread_db_update_thread_list. */ |
1eb2dbb8 | 1510 | gdb_assert (info->td_ta_thr_iter_p != NULL); |
2db9a427 | 1511 | |
492d29ea | 1512 | TRY |
02c6c942 PP |
1513 | { |
1514 | /* Iterate over all user-space threads to discover new threads. */ | |
1515 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1516 | find_new_threads_callback, | |
1517 | &data, | |
1518 | TD_THR_ANY_STATE, | |
1519 | TD_THR_LOWEST_PRIORITY, | |
1520 | TD_SIGNO_MASK, | |
1521 | TD_THR_ANY_USER_FLAGS); | |
1522 | } | |
6c63c96a | 1523 | CATCH (except, RETURN_MASK_ERROR) |
02c6c942 | 1524 | { |
6c63c96a | 1525 | if (libthread_db_debug) |
492d29ea PA |
1526 | { |
1527 | exception_fprintf (gdb_stdlog, except, | |
1528 | "Warning: find_new_threads_once: "); | |
1529 | } | |
6c63c96a PA |
1530 | } |
1531 | END_CATCH | |
02c6c942 | 1532 | |
6c63c96a PA |
1533 | if (libthread_db_debug) |
1534 | { | |
883ed13e PA |
1535 | fprintf_unfiltered (gdb_stdlog, |
1536 | _("Found %d new threads in iteration %d.\n"), | |
1537 | data.new_threads, iteration); | |
02c6c942 PP |
1538 | } |
1539 | ||
1540 | if (errp != NULL) | |
1541 | *errp = err; | |
1542 | ||
1543 | return data.new_threads; | |
1544 | } | |
1545 | ||
4c28f408 | 1546 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1547 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1548 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1549 | |
fb0e1ba7 | 1550 | static void |
00431a78 | 1551 | thread_db_find_new_threads_2 (thread_info *stopped, bool until_no_new) |
fb0e1ba7 | 1552 | { |
fcb44371 | 1553 | td_err_e err = TD_OK; |
d90e17a7 | 1554 | struct thread_db_info *info; |
02c6c942 | 1555 | int i, loop; |
4c28f408 | 1556 | |
00431a78 | 1557 | info = get_thread_db_info (stopped->ptid.pid ()); |
d90e17a7 | 1558 | |
4c28f408 | 1559 | /* Access an lwp we know is stopped. */ |
00431a78 | 1560 | info->proc_handle.thread = stopped; |
02c6c942 PP |
1561 | |
1562 | if (until_no_new) | |
1563 | { | |
1564 | /* Require 4 successive iterations which do not find any new threads. | |
1565 | The 4 is a heuristic: there is an inherent race here, and I have | |
1566 | seen that 2 iterations in a row are not always sufficient to | |
1567 | "capture" all threads. */ | |
fcb44371 JK |
1568 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1569 | if (find_new_threads_once (info, i, &err) != 0) | |
1570 | { | |
1571 | /* Found some new threads. Restart the loop from beginning. */ | |
1572 | loop = -1; | |
1573 | } | |
02c6c942 PP |
1574 | } |
1575 | else | |
fcb44371 JK |
1576 | find_new_threads_once (info, 0, &err); |
1577 | ||
1578 | if (err != TD_OK) | |
1579 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1580 | } |
1581 | ||
02c6c942 | 1582 | static void |
00431a78 | 1583 | thread_db_find_new_threads_1 (thread_info *stopped) |
02c6c942 | 1584 | { |
00431a78 | 1585 | thread_db_find_new_threads_2 (stopped, 0); |
02c6c942 PP |
1586 | } |
1587 | ||
a6904d5a PA |
1588 | /* Implement the to_update_thread_list target method for this |
1589 | target. */ | |
2db9a427 | 1590 | |
f6ac5f3d PA |
1591 | void |
1592 | thread_db_target::update_thread_list () | |
28439f5e | 1593 | { |
d90e17a7 PA |
1594 | struct thread_db_info *info; |
1595 | ||
e8032dde PA |
1596 | prune_threads (); |
1597 | ||
08036331 | 1598 | for (inferior *inf : all_inferiors ()) |
c65b3e0d PA |
1599 | { |
1600 | struct thread_info *thread; | |
d90e17a7 | 1601 | |
c65b3e0d PA |
1602 | if (inf->pid == 0) |
1603 | continue; | |
d90e17a7 | 1604 | |
c65b3e0d PA |
1605 | info = get_thread_db_info (inf->pid); |
1606 | if (info == NULL) | |
1607 | continue; | |
1608 | ||
00431a78 | 1609 | thread = any_live_thread_of_inferior (inf); |
c65b3e0d PA |
1610 | if (thread == NULL || thread->executing) |
1611 | continue; | |
1612 | ||
a6904d5a PA |
1613 | /* It's best to avoid td_ta_thr_iter if possible. That walks |
1614 | data structures in the inferior's address space that may be | |
1615 | corrupted, or, if the target is running, the list may change | |
1616 | while we walk it. In the latter case, it's possible that a | |
1617 | thread exits just at the exact time that causes GDB to get | |
1618 | stuck in an infinite loop. To avoid pausing all threads | |
1619 | whenever the core wants to refresh the thread list, we | |
1620 | instead use thread_from_lwp immediately when we see an LWP | |
1621 | stop. That uses thread_db entry points that do not walk | |
1622 | libpthread's thread list, so should be safe, as well as more | |
1623 | efficient. */ | |
1624 | if (target_has_execution_1 (thread->ptid)) | |
1625 | continue; | |
1626 | ||
00431a78 | 1627 | thread_db_find_new_threads_1 (thread); |
c65b3e0d | 1628 | } |
2db9a427 | 1629 | |
a6904d5a | 1630 | /* Give the beneath target a chance to do extra processing. */ |
b6a8c27b | 1631 | this->beneath ()->update_thread_list (); |
28439f5e PA |
1632 | } |
1633 | ||
f6ac5f3d PA |
1634 | const char * |
1635 | thread_db_target::pid_to_str (ptid_t ptid) | |
fb0e1ba7 | 1636 | { |
e09875d4 | 1637 | struct thread_info *thread_info = find_thread_ptid (ptid); |
17faa917 | 1638 | |
fe978cb0 | 1639 | if (thread_info != NULL && thread_info->priv != NULL) |
fb0e1ba7 MK |
1640 | { |
1641 | static char buf[64]; | |
7aabaf9d | 1642 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
fb0e1ba7 | 1643 | |
17faa917 | 1644 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
e38504b3 | 1645 | (unsigned long) priv->tid, ptid.lwp ()); |
fb0e1ba7 MK |
1646 | |
1647 | return buf; | |
1648 | } | |
1649 | ||
d6ca69cd | 1650 | return beneath ()->pid_to_str (ptid); |
fb0e1ba7 MK |
1651 | } |
1652 | ||
28b17333 DJ |
1653 | /* Return a string describing the state of the thread specified by |
1654 | INFO. */ | |
1655 | ||
f6ac5f3d PA |
1656 | const char * |
1657 | thread_db_target::extra_thread_info (thread_info *info) | |
28b17333 | 1658 | { |
fe978cb0 | 1659 | if (info->priv == NULL) |
17faa917 DJ |
1660 | return NULL; |
1661 | ||
7aabaf9d SM |
1662 | thread_db_thread_info *priv = get_thread_db_thread_info (info); |
1663 | ||
1664 | if (priv->dying) | |
28b17333 DJ |
1665 | return "Exiting"; |
1666 | ||
1667 | return NULL; | |
1668 | } | |
1669 | ||
e04ee09e KB |
1670 | /* Return pointer to the thread_info struct which corresponds to |
1671 | THREAD_HANDLE (having length HANDLE_LEN). */ | |
1672 | ||
f6ac5f3d PA |
1673 | thread_info * |
1674 | thread_db_target::thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
1675 | int handle_len, | |
1676 | inferior *inf) | |
e04ee09e | 1677 | { |
e04ee09e KB |
1678 | thread_t handle_tid; |
1679 | ||
1680 | /* Thread handle sizes must match in order to proceed. We don't use an | |
1681 | assert here because the resulting internal error will cause GDB to | |
1682 | exit. This isn't necessarily an internal error due to the possibility | |
1683 | of garbage being passed as the thread handle via the python interface. */ | |
1684 | if (handle_len != sizeof (handle_tid)) | |
1685 | error (_("Thread handle size mismatch: %d vs %zu (from libthread_db)"), | |
1686 | handle_len, sizeof (handle_tid)); | |
1687 | ||
1688 | handle_tid = * (const thread_t *) thread_handle; | |
1689 | ||
08036331 | 1690 | for (thread_info *tp : inf->non_exited_threads ()) |
e04ee09e | 1691 | { |
7aabaf9d SM |
1692 | thread_db_thread_info *priv = get_thread_db_thread_info (tp); |
1693 | ||
08036331 | 1694 | if (priv != NULL && handle_tid == priv->tid) |
e04ee09e KB |
1695 | return tp; |
1696 | } | |
1697 | ||
1698 | return NULL; | |
1699 | } | |
1700 | ||
b2756930 KB |
1701 | /* Get the address of the thread local variable in load module LM which |
1702 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c | 1703 | |
f6ac5f3d PA |
1704 | CORE_ADDR |
1705 | thread_db_target::get_thread_local_address (ptid_t ptid, | |
1706 | CORE_ADDR lm, | |
1707 | CORE_ADDR offset) | |
3f47be5c | 1708 | { |
17faa917 DJ |
1709 | struct thread_info *thread_info; |
1710 | ||
17faa917 | 1711 | /* Find the matching thread. */ |
e09875d4 | 1712 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1713 | |
e0fd7c47 UW |
1714 | /* We may not have discovered the thread yet. */ |
1715 | if (thread_info != NULL && thread_info->priv == NULL) | |
00431a78 | 1716 | thread_info = thread_from_lwp (thread_info, ptid); |
e0fd7c47 | 1717 | |
fe978cb0 | 1718 | if (thread_info != NULL && thread_info->priv != NULL) |
3f47be5c | 1719 | { |
3f47be5c | 1720 | td_err_e err; |
00f515da | 1721 | psaddr_t address; |
e99b03dc | 1722 | thread_db_info *info = get_thread_db_info (ptid.pid ()); |
7aabaf9d | 1723 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
3f47be5c | 1724 | |
3f47be5c | 1725 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1726 | if (lm != 0) |
1727 | { | |
1728 | /* glibc doesn't provide the needed interface. */ | |
1729 | if (!info->td_thr_tls_get_addr_p) | |
1730 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1731 | _("No TLS library support")); | |
1732 | ||
1733 | /* Note the cast through uintptr_t: this interface only works if | |
1734 | a target address fits in a psaddr_t, which is a host pointer. | |
1735 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
7aabaf9d | 1736 | err = info->td_thr_tls_get_addr_p (&priv->th, |
5876f503 JK |
1737 | (psaddr_t)(uintptr_t) lm, |
1738 | offset, &address); | |
1739 | } | |
1740 | else | |
1741 | { | |
1742 | /* If glibc doesn't provide the needed interface throw an error | |
1743 | that LM is zero - normally cases it should not be. */ | |
1744 | if (!info->td_thr_tlsbase_p) | |
1745 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1746 | _("TLS load module not found")); | |
1747 | ||
1748 | /* This code path handles the case of -static -pthread executables: | |
1749 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1750 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1751 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1752 | The constant number 1 depends on GNU __libc_setup_tls | |
1753 | initialization of l_tls_modid to 1. */ | |
7aabaf9d | 1754 | err = info->td_thr_tlsbase_p (&priv->th, 1, &address); |
5876f503 JK |
1755 | address = (char *) address + offset; |
1756 | } | |
3f47be5c EZ |
1757 | |
1758 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1759 | /* The memory hasn't been allocated, yet. */ | |
1760 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1761 | /* Now, if libthread_db provided the initialization image's |
1762 | address, we *could* try to build a non-lvalue value from | |
1763 | the initialization image. */ | |
109c3e39 AC |
1764 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1765 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1766 | #endif |
1767 | ||
1768 | /* Something else went wrong. */ | |
1769 | if (err != TD_OK) | |
109c3e39 AC |
1770 | throw_error (TLS_GENERIC_ERROR, |
1771 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1772 | |
1773 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1774 | /* Do proper sign extension for the target. */ |
1775 | gdb_assert (exec_bfd); | |
1776 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1777 | ? (CORE_ADDR) (intptr_t) address | |
1778 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1779 | } |
1780 | ||
d6ca69cd | 1781 | return beneath ()->get_thread_local_address (ptid, lm, offset); |
3f47be5c EZ |
1782 | } |
1783 | ||
0ef643c8 JB |
1784 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
1785 | ||
f6ac5f3d PA |
1786 | ptid_t |
1787 | thread_db_target::get_ada_task_ptid (long lwp, long thread) | |
0ef643c8 | 1788 | { |
2db9a427 | 1789 | /* NPTL uses a 1:1 model, so the LWP id suffices. */ |
e99b03dc | 1790 | return ptid_t (inferior_ptid.pid (), lwp, 0); |
0ef643c8 JB |
1791 | } |
1792 | ||
f6ac5f3d PA |
1793 | void |
1794 | thread_db_target::resume (ptid_t ptid, int step, enum gdb_signal signo) | |
4d062f1a | 1795 | { |
4d062f1a PA |
1796 | struct thread_db_info *info; |
1797 | ||
d7e15655 | 1798 | if (ptid == minus_one_ptid) |
e99b03dc | 1799 | info = get_thread_db_info (inferior_ptid.pid ()); |
4d062f1a | 1800 | else |
e99b03dc | 1801 | info = get_thread_db_info (ptid.pid ()); |
4d062f1a PA |
1802 | |
1803 | /* This workaround is only needed for child fork lwps stopped in a | |
1804 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1805 | workaround can be disabled. */ | |
1806 | if (info) | |
1807 | info->need_stale_parent_threads_check = 0; | |
1808 | ||
d6ca69cd | 1809 | beneath ()->resume (ptid, step, signo); |
4d062f1a PA |
1810 | } |
1811 | ||
9b292f68 | 1812 | /* std::sort helper function for info_auto_load_libthread_db, sort the |
bf88dd68 JK |
1813 | thread_db_info pointers primarily by their FILENAME and secondarily by their |
1814 | PID, both in ascending order. */ | |
1815 | ||
9b292f68 TT |
1816 | static bool |
1817 | info_auto_load_libthread_db_compare (const struct thread_db_info *a, | |
1818 | const struct thread_db_info *b) | |
bf88dd68 | 1819 | { |
bf88dd68 JK |
1820 | int retval; |
1821 | ||
1822 | retval = strcmp (a->filename, b->filename); | |
1823 | if (retval) | |
9b292f68 | 1824 | return retval < 0; |
bf88dd68 | 1825 | |
9b292f68 | 1826 | return a->pid < b->pid; |
bf88dd68 JK |
1827 | } |
1828 | ||
1829 | /* Implement 'info auto-load libthread-db'. */ | |
1830 | ||
1831 | static void | |
5fed81ff | 1832 | info_auto_load_libthread_db (const char *args, int from_tty) |
bf88dd68 JK |
1833 | { |
1834 | struct ui_out *uiout = current_uiout; | |
1835 | const char *cs = args ? args : ""; | |
9b292f68 TT |
1836 | struct thread_db_info *info; |
1837 | unsigned unique_filenames; | |
1838 | size_t max_filename_len, pids_len; | |
bf88dd68 JK |
1839 | int i; |
1840 | ||
f1735a53 | 1841 | cs = skip_spaces (cs); |
bf88dd68 JK |
1842 | if (*cs) |
1843 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1844 | ||
9b292f68 | 1845 | std::vector<struct thread_db_info *> array; |
bf88dd68 JK |
1846 | for (info = thread_db_list; info; info = info->next) |
1847 | if (info->filename != NULL) | |
9b292f68 | 1848 | array.push_back (info); |
bf88dd68 JK |
1849 | |
1850 | /* Sort ARRAY by filenames and PIDs. */ | |
9b292f68 TT |
1851 | std::sort (array.begin (), array.end (), |
1852 | info_auto_load_libthread_db_compare); | |
bf88dd68 JK |
1853 | |
1854 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1855 | length of PIDs list for the unique filenames (columns). */ | |
1856 | ||
1857 | unique_filenames = 0; | |
1858 | max_filename_len = 0; | |
bf88dd68 | 1859 | pids_len = 0; |
9b292f68 | 1860 | for (i = 0; i < array.size (); i++) |
bf88dd68 JK |
1861 | { |
1862 | int pid = array[i]->pid; | |
1863 | size_t this_pid_len; | |
1864 | ||
1865 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1866 | this_pid_len++; | |
1867 | ||
1868 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1869 | { | |
1870 | unique_filenames++; | |
325fac50 PA |
1871 | max_filename_len = std::max (max_filename_len, |
1872 | strlen (array[i]->filename)); | |
bf88dd68 JK |
1873 | |
1874 | if (i > 0) | |
9b292f68 | 1875 | pids_len -= strlen (", "); |
bf88dd68 JK |
1876 | pids_len = 0; |
1877 | } | |
1878 | pids_len += this_pid_len + strlen (", "); | |
1879 | } | |
1880 | if (i) | |
9b292f68 | 1881 | pids_len -= strlen (", "); |
bf88dd68 JK |
1882 | |
1883 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1884 | its columns. */ | |
9b292f68 | 1885 | if (array.size () > 0 && args == auto_load_info_scripts_pattern_nl) |
112e8700 | 1886 | uiout->text ("\n"); |
bf88dd68 | 1887 | |
4a2b031d TT |
1888 | { |
1889 | ui_out_emit_table table_emitter (uiout, 2, unique_filenames, | |
1890 | "LinuxThreadDbTable"); | |
bf88dd68 | 1891 | |
4a2b031d TT |
1892 | uiout->table_header (max_filename_len, ui_left, "filename", "Filename"); |
1893 | uiout->table_header (pids_len, ui_left, "PIDs", "Pids"); | |
1894 | uiout->table_body (); | |
bf88dd68 | 1895 | |
4a2b031d | 1896 | /* Note I is incremented inside the cycle, not at its end. */ |
9b292f68 | 1897 | for (i = 0; i < array.size ();) |
4a2b031d TT |
1898 | { |
1899 | ui_out_emit_tuple tuple_emitter (uiout, NULL); | |
bf88dd68 | 1900 | |
4a2b031d TT |
1901 | info = array[i]; |
1902 | uiout->field_string ("filename", info->filename); | |
bf88dd68 | 1903 | |
9b292f68 TT |
1904 | std::string pids; |
1905 | while (i < array.size () && strcmp (info->filename, | |
1906 | array[i]->filename) == 0) | |
4a2b031d | 1907 | { |
9b292f68 TT |
1908 | if (!pids.empty ()) |
1909 | pids += ", "; | |
1910 | string_appendf (pids, "%u", array[i]->pid); | |
4a2b031d TT |
1911 | i++; |
1912 | } | |
bf88dd68 | 1913 | |
9b292f68 | 1914 | uiout->field_string ("pids", pids.c_str ()); |
bf88dd68 | 1915 | |
4a2b031d TT |
1916 | uiout->text ("\n"); |
1917 | } | |
1918 | } | |
bf88dd68 | 1919 | |
9b292f68 | 1920 | if (array.empty ()) |
112e8700 | 1921 | uiout->message (_("No auto-loaded libthread-db.\n")); |
bf88dd68 JK |
1922 | } |
1923 | ||
5045b3d7 GB |
1924 | /* Implement 'maintenance check libthread-db'. */ |
1925 | ||
1926 | static void | |
1927 | maintenance_check_libthread_db (const char *args, int from_tty) | |
1928 | { | |
e99b03dc | 1929 | int inferior_pid = inferior_ptid.pid (); |
5045b3d7 GB |
1930 | struct thread_db_info *info; |
1931 | ||
1932 | if (inferior_pid == 0) | |
1933 | error (_("No inferior running")); | |
1934 | ||
1935 | info = get_thread_db_info (inferior_pid); | |
1936 | if (info == NULL) | |
1937 | error (_("No libthread_db loaded")); | |
1938 | ||
1939 | check_thread_db (info, true); | |
1940 | } | |
1941 | ||
fb0e1ba7 MK |
1942 | void |
1943 | _initialize_thread_db (void) | |
1944 | { | |
17a37d48 PP |
1945 | /* Defer loading of libthread_db.so until inferior is running. |
1946 | This allows gdb to load correct libthread_db for a given | |
4a6ed09b PA |
1947 | executable -- there could be multiple versions of glibc, |
1948 | and until there is a running inferior, we can't tell which | |
1949 | libthread_db is the correct one to load. */ | |
17a37d48 PP |
1950 | |
1951 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1952 | ||
1953 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1954 | class_support, | |
1955 | &libthread_db_search_path, _("\ | |
1956 | Set search path for libthread_db."), _("\ | |
1957 | Show the current search path or libthread_db."), _("\ | |
1958 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
1959 | gdb itself.\n\ |
1960 | Its value is a colon (':') separate list of directories to search.\n\ | |
1961 | Setting the search path to an empty list resets it to its default value."), | |
1962 | set_libthread_db_search_path, | |
17a37d48 PP |
1963 | NULL, |
1964 | &setlist, &showlist); | |
02d868e8 | 1965 | |
ccce17b0 YQ |
1966 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
1967 | &libthread_db_debug, _("\ | |
02d868e8 PP |
1968 | Set libthread-db debugging."), _("\ |
1969 | Show libthread-db debugging."), _("\ | |
1970 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
1971 | NULL, |
1972 | show_libthread_db_debug, | |
1973 | &setdebuglist, &showdebuglist); | |
02d868e8 | 1974 | |
bf88dd68 JK |
1975 | add_setshow_boolean_cmd ("libthread-db", class_support, |
1976 | &auto_load_thread_db, _("\ | |
1977 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
1978 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
1979 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
1980 | locations to load libthread_db compatible with the inferior.\n\ | |
1981 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
1982 | This options has security implications for untrusted inferiors."), | |
1983 | NULL, show_auto_load_thread_db, | |
1984 | auto_load_set_cmdlist_get (), | |
1985 | auto_load_show_cmdlist_get ()); | |
1986 | ||
1987 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
1988 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
1989 | Usage: info auto-load libthread-db"), | |
1990 | auto_load_info_cmdlist_get ()); | |
1991 | ||
5045b3d7 GB |
1992 | add_cmd ("libthread-db", class_maintenance, |
1993 | maintenance_check_libthread_db, _("\ | |
1994 | Run integrity checks on the current inferior's libthread_db."), | |
1995 | &maintenancechecklist); | |
1996 | ||
1997 | add_setshow_boolean_cmd ("check-libthread-db", | |
1998 | class_maintenance, | |
1999 | &check_thread_db_on_load, _("\ | |
2000 | Set whether to check libthread_db at load time."), _("\ | |
2001 | Show whether to check libthread_db at load time."), _("\ | |
2002 | If enabled GDB will run integrity checks on inferior specific libthread_db\n\ | |
2003 | as they are loaded."), | |
2004 | NULL, | |
2005 | NULL, | |
2006 | &maintenance_set_cmdlist, | |
2007 | &maintenance_show_cmdlist); | |
2008 | ||
17a37d48 | 2009 | /* Add ourselves to objfile event chain. */ |
76727919 | 2010 | gdb::observers::new_objfile.attach (thread_db_new_objfile); |
0838fb57 DE |
2011 | |
2012 | /* Add ourselves to inferior_created event chain. | |
2013 | This is needed to handle debugging statically linked programs where | |
2014 | the new_objfile observer won't get called for libpthread. */ | |
76727919 | 2015 | gdb::observers::inferior_created.attach (thread_db_inferior_created); |
fb0e1ba7 | 2016 | } |