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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
e2882c85 | 3 | Copyright (C) 1999-2018 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: | |
88 | thread_db_target (); | |
89 | ||
d9f719f1 PA |
90 | const target_info &info () const override |
91 | { return thread_db_target_info; } | |
f6ac5f3d PA |
92 | |
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 | ||
110 | thread_db_target::thread_db_target () | |
111 | { | |
112 | this->to_stratum = thread_stratum; | |
113 | } | |
114 | ||
17a37d48 PP |
115 | static char *libthread_db_search_path; |
116 | ||
bf88dd68 JK |
117 | /* Set to non-zero if thread_db auto-loading is enabled |
118 | by the "set auto-load libthread-db" command. */ | |
119 | static int auto_load_thread_db = 1; | |
120 | ||
5045b3d7 GB |
121 | /* Set to non-zero if load-time libthread_db tests have been enabled |
122 | by the "maintenence set check-libthread-db" command. */ | |
123 | static int check_thread_db_on_load = 0; | |
124 | ||
bf88dd68 JK |
125 | /* "show" command for the auto_load_thread_db configuration variable. */ |
126 | ||
127 | static void | |
128 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
129 | struct cmd_list_element *c, const char *value) | |
130 | { | |
131 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
132 | "is %s.\n"), | |
133 | value); | |
134 | } | |
135 | ||
84e578fb | 136 | static void |
eb4c3f4a | 137 | set_libthread_db_search_path (const char *ignored, int from_tty, |
84e578fb DE |
138 | struct cmd_list_element *c) |
139 | { | |
140 | if (*libthread_db_search_path == '\0') | |
141 | { | |
142 | xfree (libthread_db_search_path); | |
143 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
144 | } | |
145 | } | |
146 | ||
02d868e8 PP |
147 | /* If non-zero, print details of libthread_db processing. */ |
148 | ||
ccce17b0 | 149 | static unsigned int libthread_db_debug; |
02d868e8 PP |
150 | |
151 | static void | |
152 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
153 | struct cmd_list_element *c, const char *value) | |
154 | { | |
155 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
156 | } | |
157 | ||
8605d56e AC |
158 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
159 | threads. */ | |
fb0e1ba7 | 160 | |
fb0e1ba7 | 161 | /* This module's target vector. */ |
f6ac5f3d | 162 | static thread_db_target the_thread_db_target; |
fb0e1ba7 | 163 | |
fb0e1ba7 MK |
164 | /* Non-zero if we have determined the signals used by the threads |
165 | library. */ | |
166 | static int thread_signals; | |
167 | static sigset_t thread_stop_set; | |
168 | static sigset_t thread_print_set; | |
169 | ||
d90e17a7 PA |
170 | struct thread_db_info |
171 | { | |
172 | struct thread_db_info *next; | |
173 | ||
174 | /* Process id this object refers to. */ | |
175 | int pid; | |
176 | ||
177 | /* Handle from dlopen for libthread_db.so. */ | |
178 | void *handle; | |
179 | ||
bf88dd68 JK |
180 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
181 | HANDLE. It may be NULL for system library. */ | |
182 | char *filename; | |
183 | ||
d90e17a7 PA |
184 | /* Structure that identifies the child process for the |
185 | <proc_service.h> interface. */ | |
186 | struct ps_prochandle proc_handle; | |
187 | ||
188 | /* Connection to the libthread_db library. */ | |
189 | td_thragent_t *thread_agent; | |
190 | ||
4d062f1a PA |
191 | /* True if we need to apply the workaround for glibc/BZ5983. When |
192 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
193 | list, nptl_db returns the parent's threads in addition to the new | |
194 | (single) child thread. If this flag is set, we do extra work to | |
195 | be able to ignore such stale entries. */ | |
196 | int need_stale_parent_threads_check; | |
197 | ||
d90e17a7 | 198 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 199 | |
96e9210f PA |
200 | td_init_ftype *td_init_p; |
201 | td_ta_new_ftype *td_ta_new_p; | |
202 | td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p; | |
203 | td_ta_thr_iter_ftype *td_ta_thr_iter_p; | |
96e9210f | 204 | td_thr_get_info_ftype *td_thr_get_info_p; |
96e9210f PA |
205 | td_thr_tls_get_addr_ftype *td_thr_tls_get_addr_p; |
206 | td_thr_tlsbase_ftype *td_thr_tlsbase_p; | |
d90e17a7 PA |
207 | }; |
208 | ||
209 | /* List of known processes using thread_db, and the required | |
210 | bookkeeping. */ | |
211 | struct thread_db_info *thread_db_list; | |
212 | ||
00431a78 PA |
213 | static void thread_db_find_new_threads_1 (thread_info *stopped); |
214 | static void thread_db_find_new_threads_2 (thread_info *stopped, | |
215 | bool until_no_new); | |
d90e17a7 | 216 | |
2db9a427 PA |
217 | static void check_thread_signals (void); |
218 | ||
be550b6e DE |
219 | static struct thread_info *record_thread |
220 | (struct thread_db_info *info, struct thread_info *tp, | |
221 | ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p); | |
2db9a427 | 222 | |
d90e17a7 PA |
223 | /* Add the current inferior to the list of processes using libpthread. |
224 | Return a pointer to the newly allocated object that was added to | |
225 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
226 | LIBTHREAD_DB_SO. */ | |
227 | ||
228 | static struct thread_db_info * | |
229 | add_thread_db_info (void *handle) | |
230 | { | |
8d749320 | 231 | struct thread_db_info *info = XCNEW (struct thread_db_info); |
d90e17a7 | 232 | |
e99b03dc | 233 | info->pid = inferior_ptid.pid (); |
d90e17a7 | 234 | info->handle = handle; |
856d6f99 PA |
235 | |
236 | /* The workaround works by reading from /proc/pid/status, so it is | |
237 | disabled for core files. */ | |
238 | if (target_has_execution) | |
239 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
240 | |
241 | info->next = thread_db_list; | |
242 | thread_db_list = info; | |
243 | ||
244 | return info; | |
245 | } | |
246 | ||
247 | /* Return the thread_db_info object representing the bookkeeping | |
248 | related to process PID, if any; NULL otherwise. */ | |
249 | ||
250 | static struct thread_db_info * | |
251 | get_thread_db_info (int pid) | |
252 | { | |
253 | struct thread_db_info *info; | |
254 | ||
255 | for (info = thread_db_list; info; info = info->next) | |
256 | if (pid == info->pid) | |
257 | return info; | |
258 | ||
259 | return NULL; | |
260 | } | |
261 | ||
262 | /* When PID has exited or has been detached, we no longer want to keep | |
263 | track of it as using libpthread. Call this function to discard | |
264 | thread_db related info related to PID. Note that this closes | |
265 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
266 | ||
267 | static void | |
268 | delete_thread_db_info (int pid) | |
269 | { | |
270 | struct thread_db_info *info, *info_prev; | |
271 | ||
272 | info_prev = NULL; | |
273 | ||
274 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
275 | if (pid == info->pid) | |
276 | break; | |
277 | ||
278 | if (info == NULL) | |
279 | return; | |
280 | ||
281 | if (info->handle != NULL) | |
282 | dlclose (info->handle); | |
283 | ||
bf88dd68 JK |
284 | xfree (info->filename); |
285 | ||
d90e17a7 PA |
286 | if (info_prev) |
287 | info_prev->next = info->next; | |
288 | else | |
289 | thread_db_list = info->next; | |
290 | ||
291 | xfree (info); | |
292 | } | |
fb0e1ba7 | 293 | |
5365276c DJ |
294 | /* Use "struct private_thread_info" to cache thread state. This is |
295 | a substantial optimization. */ | |
296 | ||
7aabaf9d | 297 | struct thread_db_thread_info : public private_thread_info |
fb0e1ba7 | 298 | { |
a2f23071 | 299 | /* Flag set when we see a TD_DEATH event for this thread. */ |
7aabaf9d | 300 | bool dying = false; |
a2f23071 | 301 | |
5365276c | 302 | /* Cached thread state. */ |
7aabaf9d SM |
303 | td_thrhandle_t th {}; |
304 | thread_t tid {}; | |
fb0e1ba7 | 305 | }; |
7aabaf9d SM |
306 | |
307 | static thread_db_thread_info * | |
308 | get_thread_db_thread_info (thread_info *thread) | |
309 | { | |
310 | return static_cast<thread_db_thread_info *> (thread->priv.get ()); | |
311 | } | |
21bf60fe | 312 | |
a121b7c1 | 313 | static const char * |
fb0e1ba7 MK |
314 | thread_db_err_str (td_err_e err) |
315 | { | |
316 | static char buf[64]; | |
317 | ||
318 | switch (err) | |
319 | { | |
320 | case TD_OK: | |
321 | return "generic 'call succeeded'"; | |
322 | case TD_ERR: | |
323 | return "generic error"; | |
324 | case TD_NOTHR: | |
325 | return "no thread to satisfy query"; | |
326 | case TD_NOSV: | |
327 | return "no sync handle to satisfy query"; | |
328 | case TD_NOLWP: | |
329 | return "no LWP to satisfy query"; | |
330 | case TD_BADPH: | |
331 | return "invalid process handle"; | |
332 | case TD_BADTH: | |
333 | return "invalid thread handle"; | |
334 | case TD_BADSH: | |
335 | return "invalid synchronization handle"; | |
336 | case TD_BADTA: | |
337 | return "invalid thread agent"; | |
338 | case TD_BADKEY: | |
339 | return "invalid key"; | |
340 | case TD_NOMSG: | |
341 | return "no event message for getmsg"; | |
342 | case TD_NOFPREGS: | |
343 | return "FPU register set not available"; | |
344 | case TD_NOLIBTHREAD: | |
345 | return "application not linked with libthread"; | |
346 | case TD_NOEVENT: | |
347 | return "requested event is not supported"; | |
348 | case TD_NOCAPAB: | |
349 | return "capability not available"; | |
350 | case TD_DBERR: | |
351 | return "debugger service failed"; | |
352 | case TD_NOAPLIC: | |
353 | return "operation not applicable to"; | |
354 | case TD_NOTSD: | |
355 | return "no thread-specific data for this thread"; | |
356 | case TD_MALLOC: | |
357 | return "malloc failed"; | |
358 | case TD_PARTIALREG: | |
359 | return "only part of register set was written/read"; | |
360 | case TD_NOXREGS: | |
361 | return "X register set not available for this thread"; | |
59f80f10 DJ |
362 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
363 | case TD_NOTALLOC: | |
364 | return "thread has not yet allocated TLS for given module"; | |
365 | #endif | |
366 | #ifdef THREAD_DB_HAS_TD_VERSION | |
367 | case TD_VERSION: | |
368 | return "versions of libpthread and libthread_db do not match"; | |
369 | #endif | |
370 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
371 | case TD_NOTLS: | |
372 | return "there is no TLS segment in the given module"; | |
373 | #endif | |
fb0e1ba7 MK |
374 | default: |
375 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
376 | return buf; | |
377 | } | |
378 | } | |
4105de34 | 379 | |
00431a78 PA |
380 | /* Fetch the user-level thread id of PTID. STOPPED is a stopped |
381 | thread that we can use to access memory. */ | |
fb0e1ba7 | 382 | |
be550b6e | 383 | static struct thread_info * |
00431a78 | 384 | thread_from_lwp (thread_info *stopped, ptid_t ptid) |
fb0e1ba7 | 385 | { |
fb0e1ba7 | 386 | td_thrhandle_t th; |
2db9a427 | 387 | td_thrinfo_t ti; |
fb0e1ba7 | 388 | td_err_e err; |
d90e17a7 | 389 | struct thread_db_info *info; |
2db9a427 | 390 | struct thread_info *tp; |
fb0e1ba7 | 391 | |
6cb9b55b PP |
392 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
393 | th.th_unique = 0; | |
394 | ||
17faa917 DJ |
395 | /* This ptid comes from linux-nat.c, which should always fill in the |
396 | LWP. */ | |
e38504b3 | 397 | gdb_assert (ptid.lwp () != 0); |
fb0e1ba7 | 398 | |
e99b03dc | 399 | info = get_thread_db_info (ptid.pid ()); |
d90e17a7 | 400 | |
4c28f408 | 401 | /* Access an lwp we know is stopped. */ |
00431a78 | 402 | info->proc_handle.thread = stopped; |
e38504b3 | 403 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid.lwp (), |
dfd4cc63 | 404 | &th); |
fb0e1ba7 | 405 | if (err != TD_OK) |
8a3fe4f8 | 406 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
e38504b3 | 407 | ptid.lwp (), thread_db_err_str (err)); |
fb0e1ba7 | 408 | |
2db9a427 PA |
409 | err = info->td_thr_get_info_p (&th, &ti); |
410 | if (err != TD_OK) | |
411 | error (_("thread_get_info_callback: cannot get thread info: %s"), | |
412 | thread_db_err_str (err)); | |
413 | ||
414 | /* Fill the cache. */ | |
415 | tp = find_thread_ptid (ptid); | |
be550b6e | 416 | return record_thread (info, tp, ptid, &th, &ti); |
fb0e1ba7 MK |
417 | } |
418 | \f | |
419 | ||
2db9a427 PA |
420 | /* See linux-nat.h. */ |
421 | ||
4c28f408 | 422 | int |
2db9a427 | 423 | thread_db_notice_clone (ptid_t parent, ptid_t child) |
4c28f408 | 424 | { |
d90e17a7 | 425 | struct thread_db_info *info; |
4c28f408 | 426 | |
e99b03dc | 427 | info = get_thread_db_info (child.pid ()); |
d90e17a7 PA |
428 | |
429 | if (info == NULL) | |
4c28f408 PA |
430 | return 0; |
431 | ||
00431a78 | 432 | thread_info *stopped = find_thread_ptid (parent); |
4c28f408 | 433 | |
00431a78 PA |
434 | thread_from_lwp (stopped, child); |
435 | ||
436 | /* If we do not know about the main thread's pthread info yet, this | |
437 | would be a good time to find it. */ | |
438 | thread_from_lwp (stopped, parent); | |
4c28f408 PA |
439 | return 1; |
440 | } | |
441 | ||
5220ea4c AC |
442 | static void * |
443 | verbose_dlsym (void *handle, const char *name) | |
444 | { | |
445 | void *sym = dlsym (handle, name); | |
446 | if (sym == NULL) | |
3e43a32a MS |
447 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
448 | name, dlerror ()); | |
5220ea4c AC |
449 | return sym; |
450 | } | |
451 | ||
fcb44371 JK |
452 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
453 | return 1 if this version is lower (and not equal) to | |
454 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
455 | ||
456 | static int | |
457 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
458 | { | |
3b7344d5 | 459 | struct bound_minimal_symbol version_msym; |
fcb44371 | 460 | CORE_ADDR version_addr; |
e83e4e24 | 461 | gdb::unique_xmalloc_ptr<char> version; |
fcb44371 JK |
462 | int err, got, retval = 0; |
463 | ||
464 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 465 | if (version_msym.minsym == NULL) |
fcb44371 JK |
466 | return 0; |
467 | ||
77e371c0 | 468 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
fcb44371 | 469 | got = target_read_string (version_addr, &version, 32, &err); |
e83e4e24 | 470 | if (err == 0 && memchr (version.get (), 0, got) == version.get () + got - 1) |
fcb44371 JK |
471 | { |
472 | int major, minor; | |
473 | ||
e83e4e24 | 474 | retval = (sscanf (version.get (), "%d.%d", &major, &minor) == 2 |
fcb44371 JK |
475 | && (major < ver_major_min |
476 | || (major == ver_major_min && minor < ver_minor_min))); | |
477 | } | |
fcb44371 JK |
478 | |
479 | return retval; | |
480 | } | |
481 | ||
fcb44371 JK |
482 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
483 | if appropriate. | |
456b0e24 | 484 | |
fcb44371 JK |
485 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
486 | otherwise. */ | |
487 | ||
488 | static int | |
00431a78 | 489 | thread_db_find_new_threads_silently (thread_info *stopped) |
456b0e24 | 490 | { |
456b0e24 | 491 | |
492d29ea | 492 | TRY |
456b0e24 | 493 | { |
00431a78 | 494 | thread_db_find_new_threads_2 (stopped, true); |
456b0e24 PP |
495 | } |
496 | ||
492d29ea | 497 | CATCH (except, RETURN_MASK_ERROR) |
e0881a8e | 498 | { |
fcb44371 | 499 | if (libthread_db_debug) |
883ed13e | 500 | exception_fprintf (gdb_stdlog, except, |
fcb44371 JK |
501 | "Warning: thread_db_find_new_threads_silently: "); |
502 | ||
503 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
504 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
505 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
506 | executables if td_thr_get_info is called before glibc has initialized | |
507 | itself. | |
508 | ||
509 | If the nptl bug is NOT present in the inferior and still thread_db | |
510 | reports an error return 1. It means the inferior has corrupted thread | |
511 | list and GDB should fall back only to LWPs. | |
512 | ||
513 | If the nptl bug is present in the inferior return 0 to silently ignore | |
514 | such errors, and let gdb enumerate threads again later. In such case | |
515 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
516 | corrupted. For core files it does not apply, no 'later enumeration' |
517 | is possible. */ | |
fcb44371 | 518 | |
889003ed | 519 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
520 | { |
521 | exception_fprintf (gdb_stderr, except, | |
522 | _("Warning: couldn't activate thread debugging " | |
523 | "using libthread_db: ")); | |
524 | return 1; | |
525 | } | |
e0881a8e | 526 | } |
492d29ea PA |
527 | END_CATCH |
528 | ||
fcb44371 | 529 | return 0; |
456b0e24 PP |
530 | } |
531 | ||
d90e17a7 PA |
532 | /* Lookup a library in which given symbol resides. |
533 | Note: this is looking in GDB process, not in the inferior. | |
534 | Returns library name, or NULL. */ | |
535 | ||
536 | static const char * | |
537 | dladdr_to_soname (const void *addr) | |
538 | { | |
539 | Dl_info info; | |
540 | ||
541 | if (dladdr (addr, &info) != 0) | |
542 | return info.dli_fname; | |
543 | return NULL; | |
544 | } | |
545 | ||
5045b3d7 GB |
546 | /* State for check_thread_db_callback. */ |
547 | ||
548 | struct check_thread_db_info | |
549 | { | |
550 | /* The libthread_db under test. */ | |
551 | struct thread_db_info *info; | |
552 | ||
553 | /* True if progress should be logged. */ | |
554 | bool log_progress; | |
555 | ||
556 | /* True if the callback was called. */ | |
557 | bool threads_seen; | |
558 | ||
559 | /* Name of last libthread_db function called. */ | |
560 | const char *last_call; | |
561 | ||
562 | /* Value returned by last libthread_db call. */ | |
563 | td_err_e last_result; | |
564 | }; | |
565 | ||
566 | static struct check_thread_db_info *tdb_testinfo; | |
567 | ||
568 | /* Callback for check_thread_db. */ | |
569 | ||
570 | static int | |
571 | check_thread_db_callback (const td_thrhandle_t *th, void *arg) | |
572 | { | |
573 | gdb_assert (tdb_testinfo != NULL); | |
574 | tdb_testinfo->threads_seen = true; | |
575 | ||
576 | #define LOG(fmt, args...) \ | |
577 | do \ | |
578 | { \ | |
579 | if (tdb_testinfo->log_progress) \ | |
580 | { \ | |
581 | debug_printf (fmt, ## args); \ | |
582 | gdb_flush (gdb_stdlog); \ | |
583 | } \ | |
584 | } \ | |
585 | while (0) | |
586 | ||
587 | #define CHECK_1(expr, args...) \ | |
588 | do \ | |
589 | { \ | |
590 | if (!(expr)) \ | |
591 | { \ | |
592 | LOG (" ... FAIL!\n"); \ | |
593 | error (args); \ | |
594 | } \ | |
595 | } \ | |
596 | while (0) | |
597 | ||
598 | #define CHECK(expr) \ | |
599 | CHECK_1 (expr, "(%s) == false", #expr) | |
600 | ||
601 | #define CALL_UNCHECKED(func, args...) \ | |
602 | do \ | |
603 | { \ | |
604 | tdb_testinfo->last_call = #func; \ | |
605 | tdb_testinfo->last_result \ | |
606 | = tdb_testinfo->info->func ## _p (args); \ | |
607 | } \ | |
608 | while (0) | |
609 | ||
610 | #define CHECK_CALL() \ | |
611 | CHECK_1 (tdb_testinfo->last_result == TD_OK, \ | |
612 | _("%s failed: %s"), \ | |
613 | tdb_testinfo->last_call, \ | |
614 | thread_db_err_str (tdb_testinfo->last_result)) \ | |
615 | ||
616 | #define CALL(func, args...) \ | |
617 | do \ | |
618 | { \ | |
619 | CALL_UNCHECKED (func, args); \ | |
620 | CHECK_CALL (); \ | |
621 | } \ | |
622 | while (0) | |
623 | ||
624 | LOG (" Got thread"); | |
625 | ||
626 | /* Check td_ta_thr_iter passed consistent arguments. */ | |
627 | CHECK (th != NULL); | |
628 | CHECK (arg == (void *) tdb_testinfo); | |
629 | CHECK (th->th_ta_p == tdb_testinfo->info->thread_agent); | |
630 | ||
631 | LOG (" %s", core_addr_to_string_nz ((CORE_ADDR) th->th_unique)); | |
632 | ||
633 | /* Check td_thr_get_info. */ | |
634 | td_thrinfo_t ti; | |
635 | CALL (td_thr_get_info, th, &ti); | |
636 | ||
637 | LOG (" => %d", ti.ti_lid); | |
638 | ||
639 | CHECK (ti.ti_ta_p == th->th_ta_p); | |
640 | CHECK (ti.ti_tid == (thread_t) th->th_unique); | |
641 | ||
642 | /* Check td_ta_map_lwp2thr. */ | |
643 | td_thrhandle_t th2; | |
644 | memset (&th2, 23, sizeof (td_thrhandle_t)); | |
645 | CALL_UNCHECKED (td_ta_map_lwp2thr, th->th_ta_p, ti.ti_lid, &th2); | |
646 | ||
647 | if (tdb_testinfo->last_result == TD_ERR && !target_has_execution) | |
648 | { | |
649 | /* Some platforms require execution for td_ta_map_lwp2thr. */ | |
650 | LOG (_("; can't map_lwp2thr")); | |
651 | } | |
652 | else | |
653 | { | |
654 | CHECK_CALL (); | |
655 | ||
656 | LOG (" => %s", core_addr_to_string_nz ((CORE_ADDR) th2.th_unique)); | |
657 | ||
658 | CHECK (memcmp (th, &th2, sizeof (td_thrhandle_t)) == 0); | |
659 | } | |
660 | ||
661 | /* Attempt TLS access. Assuming errno is TLS, this calls | |
662 | thread_db_get_thread_local_address, which in turn calls | |
663 | td_thr_tls_get_addr for live inferiors or td_thr_tlsbase | |
664 | for core files. This test is skipped if the thread has | |
665 | not been recorded; proceeding in that case would result | |
666 | in the test having the side-effect of noticing threads | |
667 | which seems wrong. | |
668 | ||
669 | Note that in glibc's libthread_db td_thr_tls_get_addr is | |
670 | a thin wrapper around td_thr_tlsbase; this check always | |
671 | hits the bulk of the code. | |
672 | ||
673 | Note also that we don't actually check any libthread_db | |
674 | calls are made, we just assume they were; future changes | |
675 | to how GDB accesses TLS could result in this passing | |
676 | without exercising the calls it's supposed to. */ | |
fd79271b | 677 | ptid_t ptid = ptid_t (tdb_testinfo->info->pid, ti.ti_lid, 0); |
5045b3d7 GB |
678 | struct thread_info *thread_info = find_thread_ptid (ptid); |
679 | if (thread_info != NULL && thread_info->priv != NULL) | |
680 | { | |
681 | LOG ("; errno"); | |
682 | ||
683 | scoped_restore_current_thread restore_current_thread; | |
684 | switch_to_thread (ptid); | |
685 | ||
686 | expression_up expr = parse_expression ("(int) errno"); | |
687 | struct value *val = evaluate_expression (expr.get ()); | |
688 | ||
689 | if (tdb_testinfo->log_progress) | |
690 | { | |
691 | struct value_print_options opts; | |
692 | ||
693 | get_user_print_options (&opts); | |
694 | LOG (" = "); | |
695 | value_print (val, gdb_stdlog, &opts); | |
696 | } | |
697 | } | |
698 | ||
699 | LOG (" ... OK\n"); | |
700 | ||
701 | #undef LOG | |
702 | #undef CHECK_1 | |
703 | #undef CHECK | |
704 | #undef CALL_UNCHECKED | |
705 | #undef CHECK_CALL | |
706 | #undef CALL | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
711 | /* Run integrity checks on the dlopen()ed libthread_db described by | |
712 | INFO. Returns true on success, displays a warning and returns | |
713 | false on failure. Logs progress messages to gdb_stdlog during | |
714 | the test if LOG_PROGRESS is true. */ | |
715 | ||
716 | static bool | |
717 | check_thread_db (struct thread_db_info *info, bool log_progress) | |
718 | { | |
719 | bool test_passed = true; | |
720 | ||
721 | if (log_progress) | |
722 | debug_printf (_("Running libthread_db integrity checks:\n")); | |
723 | ||
724 | /* GDB avoids using td_ta_thr_iter wherever possible (see comment | |
725 | in try_thread_db_load_1 below) so in order to test it we may | |
726 | have to locate it ourselves. */ | |
727 | td_ta_thr_iter_ftype *td_ta_thr_iter_p = info->td_ta_thr_iter_p; | |
728 | if (td_ta_thr_iter_p == NULL) | |
729 | { | |
730 | void *thr_iter = verbose_dlsym (info->handle, "td_ta_thr_iter"); | |
731 | if (thr_iter == NULL) | |
732 | return 0; | |
733 | ||
734 | td_ta_thr_iter_p = (td_ta_thr_iter_ftype *) thr_iter; | |
735 | } | |
736 | ||
737 | /* Set up the test state we share with the callback. */ | |
738 | gdb_assert (tdb_testinfo == NULL); | |
739 | struct check_thread_db_info tdb_testinfo_buf; | |
740 | tdb_testinfo = &tdb_testinfo_buf; | |
741 | ||
742 | memset (tdb_testinfo, 0, sizeof (struct check_thread_db_info)); | |
743 | tdb_testinfo->info = info; | |
744 | tdb_testinfo->log_progress = log_progress; | |
745 | ||
746 | /* td_ta_thr_iter shouldn't be used on running processes. Note that | |
747 | it's possible the inferior will stop midway through modifying one | |
748 | of its thread lists, in which case the check will spuriously | |
749 | fail. */ | |
750 | linux_stop_and_wait_all_lwps (); | |
751 | ||
752 | TRY | |
753 | { | |
754 | td_err_e err = td_ta_thr_iter_p (info->thread_agent, | |
755 | check_thread_db_callback, | |
756 | tdb_testinfo, | |
757 | TD_THR_ANY_STATE, | |
758 | TD_THR_LOWEST_PRIORITY, | |
759 | TD_SIGNO_MASK, | |
760 | TD_THR_ANY_USER_FLAGS); | |
761 | ||
762 | if (err != TD_OK) | |
763 | error (_("td_ta_thr_iter failed: %s"), thread_db_err_str (err)); | |
764 | ||
765 | if (!tdb_testinfo->threads_seen) | |
766 | error (_("no threads seen")); | |
767 | } | |
768 | CATCH (except, RETURN_MASK_ERROR) | |
769 | { | |
770 | if (warning_pre_print) | |
771 | fputs_unfiltered (warning_pre_print, gdb_stderr); | |
772 | ||
773 | exception_fprintf (gdb_stderr, except, | |
774 | _("libthread_db integrity checks failed: ")); | |
775 | ||
776 | test_passed = false; | |
777 | } | |
778 | END_CATCH | |
779 | ||
780 | if (test_passed && log_progress) | |
781 | debug_printf (_("libthread_db integrity checks passed.\n")); | |
782 | ||
783 | tdb_testinfo = NULL; | |
784 | ||
785 | linux_unstop_all_lwps (); | |
786 | ||
787 | return test_passed; | |
788 | } | |
789 | ||
2471d008 | 790 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
791 | Return 1 on success. |
792 | Failure could happen if libthread_db does not have symbols we expect, | |
793 | or when it refuses to work with the current inferior (e.g. due to | |
794 | version mismatch between libthread_db and libpthread). */ | |
795 | ||
796 | static int | |
d90e17a7 | 797 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
798 | { |
799 | td_err_e err; | |
800 | ||
801 | /* Initialize pointers to the dynamic library functions we will use. | |
802 | Essential functions first. */ | |
803 | ||
96e9210f PA |
804 | #define TDB_VERBOSE_DLSYM(info, func) \ |
805 | info->func ## _p = (func ## _ftype *) verbose_dlsym (info->handle, #func) | |
806 | ||
807 | #define TDB_DLSYM(info, func) \ | |
808 | info->func ## _p = (func ## _ftype *) dlsym (info->handle, #func) | |
809 | ||
810 | #define CHK(a) \ | |
811 | do \ | |
812 | { \ | |
813 | if ((a) == NULL) \ | |
814 | return 0; \ | |
815 | } while (0) | |
816 | ||
817 | CHK (TDB_VERBOSE_DLSYM (info, td_init)); | |
17a37d48 | 818 | |
d90e17a7 | 819 | err = info->td_init_p (); |
17a37d48 PP |
820 | if (err != TD_OK) |
821 | { | |
3e43a32a MS |
822 | warning (_("Cannot initialize libthread_db: %s"), |
823 | thread_db_err_str (err)); | |
17a37d48 PP |
824 | return 0; |
825 | } | |
826 | ||
96e9210f | 827 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_new)); |
17a37d48 PP |
828 | |
829 | /* Initialize the structure that identifies the child process. */ | |
00431a78 | 830 | info->proc_handle.thread = inferior_thread (); |
17a37d48 PP |
831 | |
832 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 833 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
834 | if (err != TD_OK) |
835 | { | |
02d868e8 | 836 | if (libthread_db_debug) |
883ed13e PA |
837 | fprintf_unfiltered (gdb_stdlog, _("td_ta_new failed: %s\n"), |
838 | thread_db_err_str (err)); | |
17a37d48 PP |
839 | else |
840 | switch (err) | |
841 | { | |
842 | case TD_NOLIBTHREAD: | |
843 | #ifdef THREAD_DB_HAS_TD_VERSION | |
844 | case TD_VERSION: | |
845 | #endif | |
846 | /* The errors above are not unexpected and silently ignored: | |
847 | they just mean we haven't found correct version of | |
848 | libthread_db yet. */ | |
849 | break; | |
850 | default: | |
851 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
852 | } | |
853 | return 0; | |
854 | } | |
855 | ||
96e9210f PA |
856 | /* These are essential. */ |
857 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_map_lwp2thr)); | |
96e9210f | 858 | CHK (TDB_VERBOSE_DLSYM (info, td_thr_get_info)); |
17a37d48 PP |
859 | |
860 | /* These are not essential. */ | |
96e9210f PA |
861 | TDB_DLSYM (info, td_thr_tls_get_addr); |
862 | TDB_DLSYM (info, td_thr_tlsbase); | |
863 | ||
2db9a427 PA |
864 | /* It's best to avoid td_ta_thr_iter if possible. That walks data |
865 | structures in the inferior's address space that may be corrupted, | |
866 | or, if the target is running, may change while we walk them. If | |
867 | there's execution (and /proc is mounted), then we're already | |
868 | attached to all LWPs. Use thread_from_lwp, which uses | |
869 | td_ta_map_lwp2thr instead, which does not walk the thread list. | |
870 | ||
871 | td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that | |
872 | currently on core targets, as it uses ptrace directly. */ | |
873 | if (target_has_execution | |
e99b03dc | 874 | && linux_proc_task_list_dir_exists (inferior_ptid.pid ())) |
1eb2dbb8 PA |
875 | info->td_ta_thr_iter_p = NULL; |
876 | else | |
877 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter)); | |
878 | ||
879 | #undef TDB_VERBOSE_DLSYM | |
880 | #undef TDB_DLSYM | |
881 | #undef CHK | |
882 | ||
5045b3d7 GB |
883 | /* Run integrity checks if requested. */ |
884 | if (check_thread_db_on_load) | |
885 | { | |
886 | if (!check_thread_db (info, libthread_db_debug)) | |
887 | return 0; | |
888 | } | |
889 | ||
1eb2dbb8 | 890 | if (info->td_ta_thr_iter_p == NULL) |
2db9a427 PA |
891 | { |
892 | struct lwp_info *lp; | |
e99b03dc | 893 | int pid = inferior_ptid.pid (); |
00431a78 | 894 | thread_info *curr_thread = inferior_thread (); |
2db9a427 PA |
895 | |
896 | linux_stop_and_wait_all_lwps (); | |
897 | ||
898 | ALL_LWPS (lp) | |
e99b03dc | 899 | if (lp->ptid.pid () == pid) |
00431a78 | 900 | thread_from_lwp (curr_thread, lp->ptid); |
2db9a427 PA |
901 | |
902 | linux_unstop_all_lwps (); | |
903 | } | |
00431a78 | 904 | else if (thread_db_find_new_threads_silently (inferior_thread ()) != 0) |
fcb44371 JK |
905 | { |
906 | /* Even if libthread_db initializes, if the thread list is | |
907 | corrupted, we'd not manage to list any threads. Better reject this | |
908 | thread_db, and fall back to at least listing LWPs. */ | |
909 | return 0; | |
910 | } | |
911 | ||
17a37d48 PP |
912 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
913 | ||
883ed13e | 914 | if (*libthread_db_search_path || libthread_db_debug) |
d90e17a7 | 915 | { |
883ed13e | 916 | struct ui_file *file; |
d90e17a7 | 917 | const char *library; |
17a37d48 | 918 | |
f8708a14 | 919 | library = dladdr_to_soname ((const void *) *info->td_ta_new_p); |
d90e17a7 PA |
920 | if (library == NULL) |
921 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 922 | |
883ed13e PA |
923 | /* If we'd print this to gdb_stdout when debug output is |
924 | disabled, still print it to gdb_stdout if debug output is | |
925 | enabled. User visible output should not depend on debug | |
926 | settings. */ | |
927 | file = *libthread_db_search_path != '\0' ? gdb_stdout : gdb_stdlog; | |
928 | fprintf_unfiltered (file, _("Using host libthread_db library \"%s\".\n"), | |
929 | library); | |
d90e17a7 | 930 | } |
17a37d48 | 931 | |
d90e17a7 PA |
932 | /* The thread library was detected. Activate the thread_db target |
933 | if this is the first process using it. */ | |
934 | if (thread_db_list->next == NULL) | |
f6ac5f3d | 935 | push_target (&the_thread_db_target); |
17a37d48 | 936 | |
d90e17a7 | 937 | return 1; |
17a37d48 PP |
938 | } |
939 | ||
940 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
941 | relative, or just LIBTHREAD_DB. */ | |
942 | ||
943 | static int | |
fde4f8ed | 944 | try_thread_db_load (const char *library, int check_auto_load_safe) |
17a37d48 PP |
945 | { |
946 | void *handle; | |
d90e17a7 | 947 | struct thread_db_info *info; |
17a37d48 | 948 | |
02d868e8 | 949 | if (libthread_db_debug) |
883ed13e PA |
950 | fprintf_unfiltered (gdb_stdlog, |
951 | _("Trying host libthread_db library: %s.\n"), | |
952 | library); | |
fde4f8ed JK |
953 | |
954 | if (check_auto_load_safe) | |
955 | { | |
956 | if (access (library, R_OK) != 0) | |
957 | { | |
958 | /* Do not print warnings by file_is_auto_load_safe if the library does | |
959 | not exist at this place. */ | |
960 | if (libthread_db_debug) | |
883ed13e PA |
961 | fprintf_unfiltered (gdb_stdlog, _("open failed: %s.\n"), |
962 | safe_strerror (errno)); | |
fde4f8ed JK |
963 | return 0; |
964 | } | |
965 | ||
966 | if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db " | |
967 | "library \"%s\" from explicit " | |
968 | "directory.\n"), | |
969 | library)) | |
970 | return 0; | |
971 | } | |
972 | ||
17a37d48 PP |
973 | handle = dlopen (library, RTLD_NOW); |
974 | if (handle == NULL) | |
975 | { | |
02d868e8 | 976 | if (libthread_db_debug) |
883ed13e | 977 | fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ()); |
17a37d48 PP |
978 | return 0; |
979 | } | |
980 | ||
02d868e8 | 981 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
982 | { |
983 | void *td_init; | |
984 | ||
985 | td_init = dlsym (handle, "td_init"); | |
986 | if (td_init != NULL) | |
987 | { | |
988 | const char *const libpath = dladdr_to_soname (td_init); | |
989 | ||
990 | if (libpath != NULL) | |
883ed13e | 991 | fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"), |
17a37d48 PP |
992 | library, libpath); |
993 | } | |
994 | } | |
995 | ||
d90e17a7 PA |
996 | info = add_thread_db_info (handle); |
997 | ||
bf88dd68 JK |
998 | /* Do not save system library name, that one is always trusted. */ |
999 | if (strchr (library, '/') != NULL) | |
14278e1f | 1000 | info->filename = gdb_realpath (library).release (); |
bf88dd68 | 1001 | |
d90e17a7 | 1002 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
1003 | return 1; |
1004 | ||
1005 | /* This library "refused" to work on current inferior. */ | |
e99b03dc | 1006 | delete_thread_db_info (inferior_ptid.pid ()); |
17a37d48 PP |
1007 | return 0; |
1008 | } | |
1009 | ||
290351b8 | 1010 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
1011 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
1012 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
1013 | The result is true for success. */ |
1014 | ||
1015 | static int | |
e6712ff1 | 1016 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 1017 | { |
4262abfb | 1018 | const char *obj_name = objfile_name (obj); |
290351b8 | 1019 | |
4262abfb | 1020 | if (obj_name[0] != '/') |
290351b8 DE |
1021 | { |
1022 | warning (_("Expected absolute pathname for libpthread in the" | |
4262abfb | 1023 | " inferior, but got %s."), obj_name); |
290351b8 DE |
1024 | return 0; |
1025 | } | |
05386e9e | 1026 | |
9b292f68 TT |
1027 | std::string path = obj_name; |
1028 | size_t cp = path.rfind ('/'); | |
05386e9e | 1029 | /* This should at minimum hit the first character. */ |
9b292f68 TT |
1030 | gdb_assert (cp != std::string::npos); |
1031 | path.resize (cp + 1); | |
e6712ff1 | 1032 | if (subdir != NULL) |
9b292f68 TT |
1033 | path = path + subdir + "/"; |
1034 | path += LIBTHREAD_DB_SO; | |
bccbefd2 | 1035 | |
9b292f68 | 1036 | return try_thread_db_load (path.c_str (), 1); |
290351b8 DE |
1037 | } |
1038 | ||
98a5dd13 | 1039 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
1040 | Look for libthread_db in directory(libpthread)/SUBDIR. |
1041 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
1042 | The result is true for success. */ |
1043 | ||
1044 | static int | |
e6712ff1 | 1045 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 DE |
1046 | { |
1047 | struct objfile *obj; | |
1048 | ||
bf88dd68 JK |
1049 | if (!auto_load_thread_db) |
1050 | return 0; | |
1051 | ||
98a5dd13 | 1052 | ALL_OBJFILES (obj) |
4262abfb | 1053 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 1054 | { |
e6712ff1 | 1055 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
290351b8 DE |
1056 | return 1; |
1057 | ||
1058 | /* We may have found the separate-debug-info version of | |
1059 | libpthread, and it may live in a directory without a matching | |
1060 | libthread_db. */ | |
1061 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
1062 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
1063 | subdir); | |
290351b8 | 1064 | |
98a5dd13 DE |
1065 | return 0; |
1066 | } | |
1067 | ||
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | /* Handle $sdir in libthread-db-search-path. | |
1072 | Look for libthread_db in the system dirs, or wherever a plain | |
1073 | dlopen(file_without_path) will look. | |
1074 | The result is true for success. */ | |
1075 | ||
1076 | static int | |
1077 | try_thread_db_load_from_sdir (void) | |
1078 | { | |
fde4f8ed | 1079 | return try_thread_db_load (LIBTHREAD_DB_SO, 0); |
98a5dd13 DE |
1080 | } |
1081 | ||
1082 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
1083 | The result is true for success. */ | |
1084 | ||
1085 | static int | |
1086 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
1087 | { | |
bf88dd68 JK |
1088 | if (!auto_load_thread_db) |
1089 | return 0; | |
1090 | ||
9b292f68 | 1091 | std::string path = std::string (dir, dir_len) + "/" + LIBTHREAD_DB_SO; |
bccbefd2 | 1092 | |
9b292f68 | 1093 | return try_thread_db_load (path.c_str (), 1); |
98a5dd13 DE |
1094 | } |
1095 | ||
17a37d48 | 1096 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
1097 | to work on current inferior. |
1098 | The result is true for success. */ | |
17a37d48 PP |
1099 | |
1100 | static int | |
1101 | thread_db_load_search (void) | |
1102 | { | |
e80aaf61 | 1103 | int rc = 0; |
17a37d48 | 1104 | |
e80aaf61 SM |
1105 | std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec |
1106 | = dirnames_to_char_ptr_vec (libthread_db_search_path); | |
e6712ff1 | 1107 | |
e80aaf61 | 1108 | for (const gdb::unique_xmalloc_ptr<char> &this_dir_up : dir_vec) |
17a37d48 | 1109 | { |
e80aaf61 | 1110 | const char *this_dir = this_dir_up.get (); |
e6712ff1 | 1111 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 1112 | size_t this_dir_len; |
e0881a8e | 1113 | |
e6712ff1 | 1114 | this_dir_len = strlen (this_dir); |
17a37d48 | 1115 | |
e6712ff1 DE |
1116 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
1117 | && (this_dir[pdir_len] == '\0' | |
1118 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 1119 | { |
9b292f68 | 1120 | const char *subdir = NULL; |
e6712ff1 | 1121 | |
9b292f68 | 1122 | std::string subdir_holder; |
e6712ff1 | 1123 | if (this_dir[pdir_len] == '/') |
98a5dd13 | 1124 | { |
9b292f68 TT |
1125 | subdir_holder = std::string (this_dir + pdir_len + 1); |
1126 | subdir = subdir_holder.c_str (); | |
98a5dd13 | 1127 | } |
e6712ff1 | 1128 | rc = try_thread_db_load_from_pdir (subdir); |
e6712ff1 DE |
1129 | if (rc) |
1130 | break; | |
17a37d48 | 1131 | } |
e6712ff1 | 1132 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
1133 | { |
1134 | if (try_thread_db_load_from_sdir ()) | |
1135 | { | |
1136 | rc = 1; | |
1137 | break; | |
1138 | } | |
1139 | } | |
1140 | else | |
17a37d48 | 1141 | { |
98a5dd13 DE |
1142 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
1143 | { | |
1144 | rc = 1; | |
1145 | break; | |
1146 | } | |
17a37d48 PP |
1147 | } |
1148 | } | |
98a5dd13 DE |
1149 | |
1150 | if (libthread_db_debug) | |
883ed13e PA |
1151 | fprintf_unfiltered (gdb_stdlog, |
1152 | _("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1153 | return rc; |
1154 | } | |
1155 | ||
98a5dd13 DE |
1156 | /* Return non-zero if the inferior has a libpthread. */ |
1157 | ||
1158 | static int | |
1159 | has_libpthread (void) | |
1160 | { | |
1161 | struct objfile *obj; | |
1162 | ||
1163 | ALL_OBJFILES (obj) | |
4262abfb | 1164 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 DE |
1165 | return 1; |
1166 | ||
1167 | return 0; | |
1168 | } | |
1169 | ||
17a37d48 | 1170 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1171 | Return 1 on success. */ |
17a37d48 PP |
1172 | |
1173 | static int | |
1174 | thread_db_load (void) | |
1175 | { | |
d90e17a7 | 1176 | struct thread_db_info *info; |
17a37d48 | 1177 | |
e99b03dc | 1178 | info = get_thread_db_info (inferior_ptid.pid ()); |
d90e17a7 PA |
1179 | |
1180 | if (info != NULL) | |
17a37d48 PP |
1181 | return 1; |
1182 | ||
856d6f99 PA |
1183 | /* Don't attempt to use thread_db on executables not running |
1184 | yet. */ | |
1185 | if (!target_has_registers) | |
17a37d48 PP |
1186 | return 0; |
1187 | ||
1188 | /* Don't attempt to use thread_db for remote targets. */ | |
f6ac5f3d | 1189 | if (!(target_can_run () || core_bfd)) |
17a37d48 PP |
1190 | return 0; |
1191 | ||
1192 | if (thread_db_load_search ()) | |
1193 | return 1; | |
1194 | ||
98a5dd13 DE |
1195 | /* We couldn't find a libthread_db. |
1196 | If the inferior has a libpthread warn the user. */ | |
1197 | if (has_libpthread ()) | |
1198 | { | |
1199 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1200 | " library, thread debugging will not be available.")); | |
1201 | return 0; | |
17a37d48 | 1202 | } |
98a5dd13 | 1203 | |
17a37d48 PP |
1204 | /* Either this executable isn't using libpthread at all, or it is |
1205 | statically linked. Since we can't easily distinguish these two cases, | |
1206 | no warning is issued. */ | |
1207 | return 0; | |
1208 | } | |
1209 | ||
fb0e1ba7 MK |
1210 | static void |
1211 | check_thread_signals (void) | |
1212 | { | |
21bf60fe | 1213 | if (!thread_signals) |
fb0e1ba7 MK |
1214 | { |
1215 | sigset_t mask; | |
1216 | int i; | |
1217 | ||
669211f5 | 1218 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1219 | sigemptyset (&thread_stop_set); |
1220 | sigemptyset (&thread_print_set); | |
1221 | ||
b9569773 | 1222 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1223 | { |
1224 | if (sigismember (&mask, i)) | |
1225 | { | |
2ea28649 | 1226 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 1227 | sigaddset (&thread_stop_set, i); |
2ea28649 | 1228 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
1229 | sigaddset (&thread_print_set, i); |
1230 | thread_signals = 1; | |
1231 | } | |
1232 | } | |
1233 | } | |
fb0e1ba7 MK |
1234 | } |
1235 | ||
0ec9a092 DJ |
1236 | /* Check whether thread_db is usable. This function is called when |
1237 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1238 | and when new shared libraries are loaded into a running process. */ | |
1239 | ||
1240 | void | |
1241 | check_for_thread_db (void) | |
fb0e1ba7 | 1242 | { |
b5057acd | 1243 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1244 | if (!thread_db_load ()) |
b5057acd | 1245 | return; |
0ec9a092 DJ |
1246 | } |
1247 | ||
0838fb57 DE |
1248 | /* This function is called via the new_objfile observer. */ |
1249 | ||
0ec9a092 DJ |
1250 | static void |
1251 | thread_db_new_objfile (struct objfile *objfile) | |
1252 | { | |
d90e17a7 PA |
1253 | /* This observer must always be called with inferior_ptid set |
1254 | correctly. */ | |
1255 | ||
0838fb57 | 1256 | if (objfile != NULL |
fcb44371 | 1257 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 1258 | loaded (and notified without successful thread_db initialization) |
76727919 | 1259 | the time gdb::observers::new_objfile.notify is called for the library itself. |
fcb44371 JK |
1260 | Static executables have their separate debug info loaded already |
1261 | before the inferior has started. */ | |
1262 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1263 | /* Only check for thread_db if we loaded libpthread, |
1264 | or if this is the main symbol file. | |
1265 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1266 | a statically linked executable AND the symbol file is specified AFTER | |
1267 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1268 | For dynamically linked executables, libpthread can be near the end | |
1269 | of the list of shared libraries to load, and in an app of several | |
1270 | thousand shared libraries, this can otherwise be painful. */ | |
1271 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 1272 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 1273 | check_for_thread_db (); |
fb0e1ba7 MK |
1274 | } |
1275 | ||
015de688 DC |
1276 | static void |
1277 | check_pid_namespace_match (void) | |
1278 | { | |
1279 | /* Check is only relevant for local targets targets. */ | |
f6ac5f3d | 1280 | if (target_can_run ()) |
015de688 DC |
1281 | { |
1282 | /* If the child is in a different PID namespace, its idea of its | |
1283 | PID will differ from our idea of its PID. When we scan the | |
1284 | child's thread list, we'll mistakenly think it has no threads | |
1285 | since the thread PID fields won't match the PID we give to | |
1286 | libthread_db. */ | |
e99b03dc | 1287 | if (!linux_ns_same (inferior_ptid.pid (), LINUX_NS_PID)) |
015de688 DC |
1288 | { |
1289 | warning (_ ("Target and debugger are in different PID " | |
1290 | "namespaces; thread lists and other data are " | |
708bf0a1 JK |
1291 | "likely unreliable. " |
1292 | "Connect to gdbserver inside the container.")); | |
015de688 | 1293 | } |
015de688 DC |
1294 | } |
1295 | } | |
1296 | ||
0838fb57 DE |
1297 | /* This function is called via the inferior_created observer. |
1298 | This handles the case of debugging statically linked executables. */ | |
1299 | ||
1300 | static void | |
1301 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1302 | { | |
015de688 | 1303 | check_pid_namespace_match (); |
0838fb57 DE |
1304 | check_for_thread_db (); |
1305 | } | |
1306 | ||
c1a747c1 PA |
1307 | /* Update the thread's state (what's displayed in "info threads"), |
1308 | from libthread_db thread state information. */ | |
1309 | ||
1310 | static void | |
7aabaf9d | 1311 | update_thread_state (thread_db_thread_info *priv, |
c1a747c1 PA |
1312 | const td_thrinfo_t *ti_p) |
1313 | { | |
fe978cb0 PA |
1314 | priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN |
1315 | || ti_p->ti_state == TD_THR_ZOMBIE); | |
c1a747c1 PA |
1316 | } |
1317 | ||
2db9a427 | 1318 | /* Record a new thread in GDB's thread list. Creates the thread's |
be550b6e DE |
1319 | private info. If TP is NULL or TP is marked as having exited, |
1320 | creates a new thread. Otherwise, uses TP. */ | |
2db9a427 | 1321 | |
be550b6e | 1322 | static struct thread_info * |
2db9a427 PA |
1323 | record_thread (struct thread_db_info *info, |
1324 | struct thread_info *tp, | |
1325 | ptid_t ptid, const td_thrhandle_t *th_p, | |
1326 | const td_thrinfo_t *ti_p) | |
1327 | { | |
2db9a427 PA |
1328 | /* A thread ID of zero may mean the thread library has not |
1329 | initialized yet. Leave private == NULL until the thread library | |
1330 | has initialized. */ | |
1331 | if (ti_p->ti_tid == 0) | |
be550b6e | 1332 | return tp; |
2db9a427 | 1333 | |
17faa917 | 1334 | /* Construct the thread's private data. */ |
7aabaf9d | 1335 | thread_db_thread_info *priv = new thread_db_thread_info; |
17faa917 | 1336 | |
fe978cb0 PA |
1337 | priv->th = *th_p; |
1338 | priv->tid = ti_p->ti_tid; | |
1339 | update_thread_state (priv, ti_p); | |
17faa917 | 1340 | |
4eec2deb PA |
1341 | /* Add the thread to GDB's thread list. If we already know about a |
1342 | thread with this PTID, but it's marked exited, then the kernel | |
1343 | reused the tid of an old thread. */ | |
1344 | if (tp == NULL || tp->state == THREAD_EXITED) | |
fe978cb0 | 1345 | tp = add_thread_with_info (ptid, priv); |
17faa917 | 1346 | else |
7aabaf9d | 1347 | tp->priv.reset (priv); |
5365276c | 1348 | |
2db9a427 PA |
1349 | if (target_has_execution) |
1350 | check_thread_signals (); | |
be550b6e DE |
1351 | |
1352 | return tp; | |
fb0e1ba7 MK |
1353 | } |
1354 | ||
f6ac5f3d PA |
1355 | void |
1356 | thread_db_target::detach (inferior *inf, int from_tty) | |
fb0e1ba7 | 1357 | { |
bc09b0c1 | 1358 | delete_thread_db_info (inf->pid); |
4105de34 | 1359 | |
d6ca69cd | 1360 | beneath ()->detach (inf, from_tty); |
d90e17a7 PA |
1361 | |
1362 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1363 | ||
1364 | /* If there are no more processes using libpthread, detach the | |
1365 | thread_db target ops. */ | |
1366 | if (!thread_db_list) | |
f6ac5f3d | 1367 | unpush_target (this); |
fb0e1ba7 MK |
1368 | } |
1369 | ||
f6ac5f3d PA |
1370 | ptid_t |
1371 | thread_db_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
1372 | int options) | |
fb0e1ba7 | 1373 | { |
d90e17a7 | 1374 | struct thread_db_info *info; |
117de6a9 | 1375 | |
d6ca69cd | 1376 | ptid = beneath ()->wait (ptid, ourstatus, options); |
fb0e1ba7 | 1377 | |
aa01bd36 PA |
1378 | switch (ourstatus->kind) |
1379 | { | |
1380 | case TARGET_WAITKIND_IGNORE: | |
1381 | case TARGET_WAITKIND_EXITED: | |
1382 | case TARGET_WAITKIND_THREAD_EXITED: | |
1383 | case TARGET_WAITKIND_SIGNALLED: | |
1384 | return ptid; | |
1385 | } | |
fb0e1ba7 | 1386 | |
e99b03dc | 1387 | info = get_thread_db_info (ptid.pid ()); |
d90e17a7 PA |
1388 | |
1389 | /* If this process isn't using thread_db, we're done. */ | |
1390 | if (info == NULL) | |
1391 | return ptid; | |
1392 | ||
3f64f7b1 DJ |
1393 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1394 | { | |
d90e17a7 PA |
1395 | /* New image, it may or may not end up using thread_db. Assume |
1396 | not unless we find otherwise. */ | |
e99b03dc | 1397 | delete_thread_db_info (ptid.pid ()); |
d90e17a7 | 1398 | if (!thread_db_list) |
f6ac5f3d | 1399 | unpush_target (&the_thread_db_target); |
3f64f7b1 | 1400 | |
49fd4a42 | 1401 | return ptid; |
3f64f7b1 DJ |
1402 | } |
1403 | ||
2db9a427 | 1404 | /* Fill in the thread's user-level thread id and status. */ |
00431a78 | 1405 | thread_from_lwp (find_thread_ptid (ptid), ptid); |
fb0e1ba7 | 1406 | |
b9b5d7ea | 1407 | return ptid; |
fb0e1ba7 MK |
1408 | } |
1409 | ||
f6ac5f3d PA |
1410 | void |
1411 | thread_db_target::mourn_inferior () | |
fb0e1ba7 | 1412 | { |
e99b03dc | 1413 | delete_thread_db_info (inferior_ptid.pid ()); |
fb0e1ba7 | 1414 | |
d6ca69cd | 1415 | beneath ()->mourn_inferior (); |
d90e17a7 | 1416 | |
b26a6851 | 1417 | /* Detach thread_db target ops. */ |
d90e17a7 | 1418 | if (!thread_db_list) |
f6ac5f3d | 1419 | unpush_target (&the_thread_db_target); |
fb0e1ba7 MK |
1420 | } |
1421 | ||
02c6c942 PP |
1422 | struct callback_data |
1423 | { | |
1424 | struct thread_db_info *info; | |
1425 | int new_threads; | |
1426 | }; | |
1427 | ||
fb0e1ba7 MK |
1428 | static int |
1429 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1430 | { | |
1431 | td_thrinfo_t ti; | |
1432 | td_err_e err; | |
403fe197 | 1433 | struct thread_info *tp; |
9a3c8263 | 1434 | struct callback_data *cb_data = (struct callback_data *) data; |
02c6c942 | 1435 | struct thread_db_info *info = cb_data->info; |
fb0e1ba7 | 1436 | |
d90e17a7 | 1437 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1438 | if (err != TD_OK) |
8a3fe4f8 | 1439 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1440 | thread_db_err_str (err)); |
fb0e1ba7 | 1441 | |
a33e3959 PA |
1442 | if (ti.ti_lid == -1) |
1443 | { | |
1444 | /* A thread with kernel thread ID -1 is either a thread that | |
1445 | exited and was joined, or a thread that is being created but | |
1446 | hasn't started yet, and that is reusing the tcb/stack of a | |
1447 | thread that previously exited and was joined. (glibc marks | |
1448 | terminated and joined threads with kernel thread ID -1. See | |
1449 | glibc PR17707. */ | |
d6c146e9 PA |
1450 | if (libthread_db_debug) |
1451 | fprintf_unfiltered (gdb_stdlog, | |
1452 | "thread_db: skipping exited and " | |
d41401ac DE |
1453 | "joined thread (0x%lx)\n", |
1454 | (unsigned long) ti.ti_tid); | |
a33e3959 PA |
1455 | return 0; |
1456 | } | |
1457 | ||
254f582e | 1458 | if (ti.ti_tid == 0) |
4105de34 DJ |
1459 | { |
1460 | /* A thread ID of zero means that this is the main thread, but | |
1461 | glibc has not yet initialized thread-local storage and the | |
1462 | pthread library. We do not know what the thread's TID will | |
c2c2a31f | 1463 | be yet. */ |
4105de34 | 1464 | |
4d062f1a PA |
1465 | /* In that case, we're not stopped in a fork syscall and don't |
1466 | need this glibc bug workaround. */ | |
1467 | info->need_stale_parent_threads_check = 0; | |
1468 | ||
4105de34 DJ |
1469 | return 0; |
1470 | } | |
1471 | ||
4d062f1a PA |
1472 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1473 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1474 | avoid doing the work if we know we don't have to. */ | |
1475 | if (info->need_stale_parent_threads_check) | |
1476 | { | |
1477 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1478 | |
4d062f1a PA |
1479 | if (tgid != -1 && tgid != info->pid) |
1480 | return 0; | |
1481 | } | |
1482 | ||
00431a78 | 1483 | ptid_t ptid (info->pid, ti.ti_lid); |
e09875d4 | 1484 | tp = find_thread_ptid (ptid); |
fe978cb0 | 1485 | if (tp == NULL || tp->priv == NULL) |
60269a4a | 1486 | record_thread (info, tp, ptid, th_p, &ti); |
fb0e1ba7 MK |
1487 | |
1488 | return 0; | |
1489 | } | |
1490 | ||
02c6c942 PP |
1491 | /* Helper for thread_db_find_new_threads_2. |
1492 | Returns number of new threads found. */ | |
1493 | ||
1494 | static int | |
1495 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1496 | td_err_e *errp) |
02c6c942 | 1497 | { |
02c6c942 | 1498 | struct callback_data data; |
fb169834 | 1499 | td_err_e err = TD_ERR; |
02c6c942 PP |
1500 | |
1501 | data.info = info; | |
1502 | data.new_threads = 0; | |
1503 | ||
2db9a427 | 1504 | /* See comment in thread_db_update_thread_list. */ |
1eb2dbb8 | 1505 | gdb_assert (info->td_ta_thr_iter_p != NULL); |
2db9a427 | 1506 | |
492d29ea | 1507 | TRY |
02c6c942 PP |
1508 | { |
1509 | /* Iterate over all user-space threads to discover new threads. */ | |
1510 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1511 | find_new_threads_callback, | |
1512 | &data, | |
1513 | TD_THR_ANY_STATE, | |
1514 | TD_THR_LOWEST_PRIORITY, | |
1515 | TD_SIGNO_MASK, | |
1516 | TD_THR_ANY_USER_FLAGS); | |
1517 | } | |
6c63c96a | 1518 | CATCH (except, RETURN_MASK_ERROR) |
02c6c942 | 1519 | { |
6c63c96a | 1520 | if (libthread_db_debug) |
492d29ea PA |
1521 | { |
1522 | exception_fprintf (gdb_stdlog, except, | |
1523 | "Warning: find_new_threads_once: "); | |
1524 | } | |
6c63c96a PA |
1525 | } |
1526 | END_CATCH | |
02c6c942 | 1527 | |
6c63c96a PA |
1528 | if (libthread_db_debug) |
1529 | { | |
883ed13e PA |
1530 | fprintf_unfiltered (gdb_stdlog, |
1531 | _("Found %d new threads in iteration %d.\n"), | |
1532 | data.new_threads, iteration); | |
02c6c942 PP |
1533 | } |
1534 | ||
1535 | if (errp != NULL) | |
1536 | *errp = err; | |
1537 | ||
1538 | return data.new_threads; | |
1539 | } | |
1540 | ||
4c28f408 | 1541 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1542 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1543 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1544 | |
fb0e1ba7 | 1545 | static void |
00431a78 | 1546 | thread_db_find_new_threads_2 (thread_info *stopped, bool until_no_new) |
fb0e1ba7 | 1547 | { |
fcb44371 | 1548 | td_err_e err = TD_OK; |
d90e17a7 | 1549 | struct thread_db_info *info; |
02c6c942 | 1550 | int i, loop; |
4c28f408 | 1551 | |
00431a78 | 1552 | info = get_thread_db_info (stopped->ptid.pid ()); |
d90e17a7 | 1553 | |
4c28f408 | 1554 | /* Access an lwp we know is stopped. */ |
00431a78 | 1555 | info->proc_handle.thread = stopped; |
02c6c942 PP |
1556 | |
1557 | if (until_no_new) | |
1558 | { | |
1559 | /* Require 4 successive iterations which do not find any new threads. | |
1560 | The 4 is a heuristic: there is an inherent race here, and I have | |
1561 | seen that 2 iterations in a row are not always sufficient to | |
1562 | "capture" all threads. */ | |
fcb44371 JK |
1563 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1564 | if (find_new_threads_once (info, i, &err) != 0) | |
1565 | { | |
1566 | /* Found some new threads. Restart the loop from beginning. */ | |
1567 | loop = -1; | |
1568 | } | |
02c6c942 PP |
1569 | } |
1570 | else | |
fcb44371 JK |
1571 | find_new_threads_once (info, 0, &err); |
1572 | ||
1573 | if (err != TD_OK) | |
1574 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1575 | } |
1576 | ||
02c6c942 | 1577 | static void |
00431a78 | 1578 | thread_db_find_new_threads_1 (thread_info *stopped) |
02c6c942 | 1579 | { |
00431a78 | 1580 | thread_db_find_new_threads_2 (stopped, 0); |
02c6c942 PP |
1581 | } |
1582 | ||
a6904d5a PA |
1583 | /* Implement the to_update_thread_list target method for this |
1584 | target. */ | |
2db9a427 | 1585 | |
f6ac5f3d PA |
1586 | void |
1587 | thread_db_target::update_thread_list () | |
28439f5e | 1588 | { |
d90e17a7 | 1589 | struct thread_db_info *info; |
c65b3e0d | 1590 | struct inferior *inf; |
d90e17a7 | 1591 | |
e8032dde PA |
1592 | prune_threads (); |
1593 | ||
c65b3e0d PA |
1594 | ALL_INFERIORS (inf) |
1595 | { | |
1596 | struct thread_info *thread; | |
d90e17a7 | 1597 | |
c65b3e0d PA |
1598 | if (inf->pid == 0) |
1599 | continue; | |
d90e17a7 | 1600 | |
c65b3e0d PA |
1601 | info = get_thread_db_info (inf->pid); |
1602 | if (info == NULL) | |
1603 | continue; | |
1604 | ||
00431a78 | 1605 | thread = any_live_thread_of_inferior (inf); |
c65b3e0d PA |
1606 | if (thread == NULL || thread->executing) |
1607 | continue; | |
1608 | ||
a6904d5a PA |
1609 | /* It's best to avoid td_ta_thr_iter if possible. That walks |
1610 | data structures in the inferior's address space that may be | |
1611 | corrupted, or, if the target is running, the list may change | |
1612 | while we walk it. In the latter case, it's possible that a | |
1613 | thread exits just at the exact time that causes GDB to get | |
1614 | stuck in an infinite loop. To avoid pausing all threads | |
1615 | whenever the core wants to refresh the thread list, we | |
1616 | instead use thread_from_lwp immediately when we see an LWP | |
1617 | stop. That uses thread_db entry points that do not walk | |
1618 | libpthread's thread list, so should be safe, as well as more | |
1619 | efficient. */ | |
1620 | if (target_has_execution_1 (thread->ptid)) | |
1621 | continue; | |
1622 | ||
00431a78 | 1623 | thread_db_find_new_threads_1 (thread); |
c65b3e0d | 1624 | } |
2db9a427 | 1625 | |
a6904d5a | 1626 | /* Give the beneath target a chance to do extra processing. */ |
b6a8c27b | 1627 | this->beneath ()->update_thread_list (); |
28439f5e PA |
1628 | } |
1629 | ||
f6ac5f3d PA |
1630 | const char * |
1631 | thread_db_target::pid_to_str (ptid_t ptid) | |
fb0e1ba7 | 1632 | { |
e09875d4 | 1633 | struct thread_info *thread_info = find_thread_ptid (ptid); |
17faa917 | 1634 | |
fe978cb0 | 1635 | if (thread_info != NULL && thread_info->priv != NULL) |
fb0e1ba7 MK |
1636 | { |
1637 | static char buf[64]; | |
7aabaf9d | 1638 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
fb0e1ba7 | 1639 | |
17faa917 | 1640 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
e38504b3 | 1641 | (unsigned long) priv->tid, ptid.lwp ()); |
fb0e1ba7 MK |
1642 | |
1643 | return buf; | |
1644 | } | |
1645 | ||
d6ca69cd | 1646 | return beneath ()->pid_to_str (ptid); |
fb0e1ba7 MK |
1647 | } |
1648 | ||
28b17333 DJ |
1649 | /* Return a string describing the state of the thread specified by |
1650 | INFO. */ | |
1651 | ||
f6ac5f3d PA |
1652 | const char * |
1653 | thread_db_target::extra_thread_info (thread_info *info) | |
28b17333 | 1654 | { |
fe978cb0 | 1655 | if (info->priv == NULL) |
17faa917 DJ |
1656 | return NULL; |
1657 | ||
7aabaf9d SM |
1658 | thread_db_thread_info *priv = get_thread_db_thread_info (info); |
1659 | ||
1660 | if (priv->dying) | |
28b17333 DJ |
1661 | return "Exiting"; |
1662 | ||
1663 | return NULL; | |
1664 | } | |
1665 | ||
e04ee09e KB |
1666 | /* Return pointer to the thread_info struct which corresponds to |
1667 | THREAD_HANDLE (having length HANDLE_LEN). */ | |
1668 | ||
f6ac5f3d PA |
1669 | thread_info * |
1670 | thread_db_target::thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
1671 | int handle_len, | |
1672 | inferior *inf) | |
e04ee09e KB |
1673 | { |
1674 | struct thread_info *tp; | |
1675 | thread_t handle_tid; | |
1676 | ||
1677 | /* Thread handle sizes must match in order to proceed. We don't use an | |
1678 | assert here because the resulting internal error will cause GDB to | |
1679 | exit. This isn't necessarily an internal error due to the possibility | |
1680 | of garbage being passed as the thread handle via the python interface. */ | |
1681 | if (handle_len != sizeof (handle_tid)) | |
1682 | error (_("Thread handle size mismatch: %d vs %zu (from libthread_db)"), | |
1683 | handle_len, sizeof (handle_tid)); | |
1684 | ||
1685 | handle_tid = * (const thread_t *) thread_handle; | |
1686 | ||
1687 | ALL_NON_EXITED_THREADS (tp) | |
1688 | { | |
7aabaf9d SM |
1689 | thread_db_thread_info *priv = get_thread_db_thread_info (tp); |
1690 | ||
1691 | if (tp->inf == inf && priv != NULL && handle_tid == priv->tid) | |
e04ee09e KB |
1692 | return tp; |
1693 | } | |
1694 | ||
1695 | return NULL; | |
1696 | } | |
1697 | ||
b2756930 KB |
1698 | /* Get the address of the thread local variable in load module LM which |
1699 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c | 1700 | |
f6ac5f3d PA |
1701 | CORE_ADDR |
1702 | thread_db_target::get_thread_local_address (ptid_t ptid, | |
1703 | CORE_ADDR lm, | |
1704 | CORE_ADDR offset) | |
3f47be5c | 1705 | { |
17faa917 DJ |
1706 | struct thread_info *thread_info; |
1707 | ||
17faa917 | 1708 | /* Find the matching thread. */ |
e09875d4 | 1709 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1710 | |
e0fd7c47 UW |
1711 | /* We may not have discovered the thread yet. */ |
1712 | if (thread_info != NULL && thread_info->priv == NULL) | |
00431a78 | 1713 | thread_info = thread_from_lwp (thread_info, ptid); |
e0fd7c47 | 1714 | |
fe978cb0 | 1715 | if (thread_info != NULL && thread_info->priv != NULL) |
3f47be5c | 1716 | { |
3f47be5c | 1717 | td_err_e err; |
00f515da | 1718 | psaddr_t address; |
e99b03dc | 1719 | thread_db_info *info = get_thread_db_info (ptid.pid ()); |
7aabaf9d | 1720 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
3f47be5c | 1721 | |
3f47be5c | 1722 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1723 | if (lm != 0) |
1724 | { | |
1725 | /* glibc doesn't provide the needed interface. */ | |
1726 | if (!info->td_thr_tls_get_addr_p) | |
1727 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1728 | _("No TLS library support")); | |
1729 | ||
1730 | /* Note the cast through uintptr_t: this interface only works if | |
1731 | a target address fits in a psaddr_t, which is a host pointer. | |
1732 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
7aabaf9d | 1733 | err = info->td_thr_tls_get_addr_p (&priv->th, |
5876f503 JK |
1734 | (psaddr_t)(uintptr_t) lm, |
1735 | offset, &address); | |
1736 | } | |
1737 | else | |
1738 | { | |
1739 | /* If glibc doesn't provide the needed interface throw an error | |
1740 | that LM is zero - normally cases it should not be. */ | |
1741 | if (!info->td_thr_tlsbase_p) | |
1742 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1743 | _("TLS load module not found")); | |
1744 | ||
1745 | /* This code path handles the case of -static -pthread executables: | |
1746 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1747 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1748 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1749 | The constant number 1 depends on GNU __libc_setup_tls | |
1750 | initialization of l_tls_modid to 1. */ | |
7aabaf9d | 1751 | err = info->td_thr_tlsbase_p (&priv->th, 1, &address); |
5876f503 JK |
1752 | address = (char *) address + offset; |
1753 | } | |
3f47be5c EZ |
1754 | |
1755 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1756 | /* The memory hasn't been allocated, yet. */ | |
1757 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1758 | /* Now, if libthread_db provided the initialization image's |
1759 | address, we *could* try to build a non-lvalue value from | |
1760 | the initialization image. */ | |
109c3e39 AC |
1761 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1762 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1763 | #endif |
1764 | ||
1765 | /* Something else went wrong. */ | |
1766 | if (err != TD_OK) | |
109c3e39 AC |
1767 | throw_error (TLS_GENERIC_ERROR, |
1768 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1769 | |
1770 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1771 | /* Do proper sign extension for the target. */ |
1772 | gdb_assert (exec_bfd); | |
1773 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1774 | ? (CORE_ADDR) (intptr_t) address | |
1775 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1776 | } |
1777 | ||
d6ca69cd | 1778 | return beneath ()->get_thread_local_address (ptid, lm, offset); |
3f47be5c EZ |
1779 | } |
1780 | ||
0ef643c8 JB |
1781 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
1782 | ||
f6ac5f3d PA |
1783 | ptid_t |
1784 | thread_db_target::get_ada_task_ptid (long lwp, long thread) | |
0ef643c8 | 1785 | { |
2db9a427 | 1786 | /* NPTL uses a 1:1 model, so the LWP id suffices. */ |
e99b03dc | 1787 | return ptid_t (inferior_ptid.pid (), lwp, 0); |
0ef643c8 JB |
1788 | } |
1789 | ||
f6ac5f3d PA |
1790 | void |
1791 | thread_db_target::resume (ptid_t ptid, int step, enum gdb_signal signo) | |
4d062f1a | 1792 | { |
4d062f1a PA |
1793 | struct thread_db_info *info; |
1794 | ||
d7e15655 | 1795 | if (ptid == minus_one_ptid) |
e99b03dc | 1796 | info = get_thread_db_info (inferior_ptid.pid ()); |
4d062f1a | 1797 | else |
e99b03dc | 1798 | info = get_thread_db_info (ptid.pid ()); |
4d062f1a PA |
1799 | |
1800 | /* This workaround is only needed for child fork lwps stopped in a | |
1801 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1802 | workaround can be disabled. */ | |
1803 | if (info) | |
1804 | info->need_stale_parent_threads_check = 0; | |
1805 | ||
d6ca69cd | 1806 | beneath ()->resume (ptid, step, signo); |
4d062f1a PA |
1807 | } |
1808 | ||
9b292f68 | 1809 | /* std::sort helper function for info_auto_load_libthread_db, sort the |
bf88dd68 JK |
1810 | thread_db_info pointers primarily by their FILENAME and secondarily by their |
1811 | PID, both in ascending order. */ | |
1812 | ||
9b292f68 TT |
1813 | static bool |
1814 | info_auto_load_libthread_db_compare (const struct thread_db_info *a, | |
1815 | const struct thread_db_info *b) | |
bf88dd68 | 1816 | { |
bf88dd68 JK |
1817 | int retval; |
1818 | ||
1819 | retval = strcmp (a->filename, b->filename); | |
1820 | if (retval) | |
9b292f68 | 1821 | return retval < 0; |
bf88dd68 | 1822 | |
9b292f68 | 1823 | return a->pid < b->pid; |
bf88dd68 JK |
1824 | } |
1825 | ||
1826 | /* Implement 'info auto-load libthread-db'. */ | |
1827 | ||
1828 | static void | |
5fed81ff | 1829 | info_auto_load_libthread_db (const char *args, int from_tty) |
bf88dd68 JK |
1830 | { |
1831 | struct ui_out *uiout = current_uiout; | |
1832 | const char *cs = args ? args : ""; | |
9b292f68 TT |
1833 | struct thread_db_info *info; |
1834 | unsigned unique_filenames; | |
1835 | size_t max_filename_len, pids_len; | |
bf88dd68 JK |
1836 | int i; |
1837 | ||
f1735a53 | 1838 | cs = skip_spaces (cs); |
bf88dd68 JK |
1839 | if (*cs) |
1840 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1841 | ||
9b292f68 | 1842 | std::vector<struct thread_db_info *> array; |
bf88dd68 JK |
1843 | for (info = thread_db_list; info; info = info->next) |
1844 | if (info->filename != NULL) | |
9b292f68 | 1845 | array.push_back (info); |
bf88dd68 JK |
1846 | |
1847 | /* Sort ARRAY by filenames and PIDs. */ | |
9b292f68 TT |
1848 | std::sort (array.begin (), array.end (), |
1849 | info_auto_load_libthread_db_compare); | |
bf88dd68 JK |
1850 | |
1851 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1852 | length of PIDs list for the unique filenames (columns). */ | |
1853 | ||
1854 | unique_filenames = 0; | |
1855 | max_filename_len = 0; | |
bf88dd68 | 1856 | pids_len = 0; |
9b292f68 | 1857 | for (i = 0; i < array.size (); i++) |
bf88dd68 JK |
1858 | { |
1859 | int pid = array[i]->pid; | |
1860 | size_t this_pid_len; | |
1861 | ||
1862 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1863 | this_pid_len++; | |
1864 | ||
1865 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1866 | { | |
1867 | unique_filenames++; | |
325fac50 PA |
1868 | max_filename_len = std::max (max_filename_len, |
1869 | strlen (array[i]->filename)); | |
bf88dd68 JK |
1870 | |
1871 | if (i > 0) | |
9b292f68 | 1872 | pids_len -= strlen (", "); |
bf88dd68 JK |
1873 | pids_len = 0; |
1874 | } | |
1875 | pids_len += this_pid_len + strlen (", "); | |
1876 | } | |
1877 | if (i) | |
9b292f68 | 1878 | pids_len -= strlen (", "); |
bf88dd68 JK |
1879 | |
1880 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1881 | its columns. */ | |
9b292f68 | 1882 | if (array.size () > 0 && args == auto_load_info_scripts_pattern_nl) |
112e8700 | 1883 | uiout->text ("\n"); |
bf88dd68 | 1884 | |
4a2b031d TT |
1885 | { |
1886 | ui_out_emit_table table_emitter (uiout, 2, unique_filenames, | |
1887 | "LinuxThreadDbTable"); | |
bf88dd68 | 1888 | |
4a2b031d TT |
1889 | uiout->table_header (max_filename_len, ui_left, "filename", "Filename"); |
1890 | uiout->table_header (pids_len, ui_left, "PIDs", "Pids"); | |
1891 | uiout->table_body (); | |
bf88dd68 | 1892 | |
4a2b031d | 1893 | /* Note I is incremented inside the cycle, not at its end. */ |
9b292f68 | 1894 | for (i = 0; i < array.size ();) |
4a2b031d TT |
1895 | { |
1896 | ui_out_emit_tuple tuple_emitter (uiout, NULL); | |
bf88dd68 | 1897 | |
4a2b031d TT |
1898 | info = array[i]; |
1899 | uiout->field_string ("filename", info->filename); | |
bf88dd68 | 1900 | |
9b292f68 TT |
1901 | std::string pids; |
1902 | while (i < array.size () && strcmp (info->filename, | |
1903 | array[i]->filename) == 0) | |
4a2b031d | 1904 | { |
9b292f68 TT |
1905 | if (!pids.empty ()) |
1906 | pids += ", "; | |
1907 | string_appendf (pids, "%u", array[i]->pid); | |
4a2b031d TT |
1908 | i++; |
1909 | } | |
bf88dd68 | 1910 | |
9b292f68 | 1911 | uiout->field_string ("pids", pids.c_str ()); |
bf88dd68 | 1912 | |
4a2b031d TT |
1913 | uiout->text ("\n"); |
1914 | } | |
1915 | } | |
bf88dd68 | 1916 | |
9b292f68 | 1917 | if (array.empty ()) |
112e8700 | 1918 | uiout->message (_("No auto-loaded libthread-db.\n")); |
bf88dd68 JK |
1919 | } |
1920 | ||
5045b3d7 GB |
1921 | /* Implement 'maintenance check libthread-db'. */ |
1922 | ||
1923 | static void | |
1924 | maintenance_check_libthread_db (const char *args, int from_tty) | |
1925 | { | |
e99b03dc | 1926 | int inferior_pid = inferior_ptid.pid (); |
5045b3d7 GB |
1927 | struct thread_db_info *info; |
1928 | ||
1929 | if (inferior_pid == 0) | |
1930 | error (_("No inferior running")); | |
1931 | ||
1932 | info = get_thread_db_info (inferior_pid); | |
1933 | if (info == NULL) | |
1934 | error (_("No libthread_db loaded")); | |
1935 | ||
1936 | check_thread_db (info, true); | |
1937 | } | |
1938 | ||
fb0e1ba7 MK |
1939 | void |
1940 | _initialize_thread_db (void) | |
1941 | { | |
17a37d48 PP |
1942 | /* Defer loading of libthread_db.so until inferior is running. |
1943 | This allows gdb to load correct libthread_db for a given | |
4a6ed09b PA |
1944 | executable -- there could be multiple versions of glibc, |
1945 | and until there is a running inferior, we can't tell which | |
1946 | libthread_db is the correct one to load. */ | |
17a37d48 PP |
1947 | |
1948 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1949 | ||
1950 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1951 | class_support, | |
1952 | &libthread_db_search_path, _("\ | |
1953 | Set search path for libthread_db."), _("\ | |
1954 | Show the current search path or libthread_db."), _("\ | |
1955 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
1956 | gdb itself.\n\ |
1957 | Its value is a colon (':') separate list of directories to search.\n\ | |
1958 | Setting the search path to an empty list resets it to its default value."), | |
1959 | set_libthread_db_search_path, | |
17a37d48 PP |
1960 | NULL, |
1961 | &setlist, &showlist); | |
02d868e8 | 1962 | |
ccce17b0 YQ |
1963 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
1964 | &libthread_db_debug, _("\ | |
02d868e8 PP |
1965 | Set libthread-db debugging."), _("\ |
1966 | Show libthread-db debugging."), _("\ | |
1967 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
1968 | NULL, |
1969 | show_libthread_db_debug, | |
1970 | &setdebuglist, &showdebuglist); | |
02d868e8 | 1971 | |
bf88dd68 JK |
1972 | add_setshow_boolean_cmd ("libthread-db", class_support, |
1973 | &auto_load_thread_db, _("\ | |
1974 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
1975 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
1976 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
1977 | locations to load libthread_db compatible with the inferior.\n\ | |
1978 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
1979 | This options has security implications for untrusted inferiors."), | |
1980 | NULL, show_auto_load_thread_db, | |
1981 | auto_load_set_cmdlist_get (), | |
1982 | auto_load_show_cmdlist_get ()); | |
1983 | ||
1984 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
1985 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
1986 | Usage: info auto-load libthread-db"), | |
1987 | auto_load_info_cmdlist_get ()); | |
1988 | ||
5045b3d7 GB |
1989 | add_cmd ("libthread-db", class_maintenance, |
1990 | maintenance_check_libthread_db, _("\ | |
1991 | Run integrity checks on the current inferior's libthread_db."), | |
1992 | &maintenancechecklist); | |
1993 | ||
1994 | add_setshow_boolean_cmd ("check-libthread-db", | |
1995 | class_maintenance, | |
1996 | &check_thread_db_on_load, _("\ | |
1997 | Set whether to check libthread_db at load time."), _("\ | |
1998 | Show whether to check libthread_db at load time."), _("\ | |
1999 | If enabled GDB will run integrity checks on inferior specific libthread_db\n\ | |
2000 | as they are loaded."), | |
2001 | NULL, | |
2002 | NULL, | |
2003 | &maintenance_set_cmdlist, | |
2004 | &maintenance_show_cmdlist); | |
2005 | ||
17a37d48 | 2006 | /* Add ourselves to objfile event chain. */ |
76727919 | 2007 | gdb::observers::new_objfile.attach (thread_db_new_objfile); |
0838fb57 DE |
2008 | |
2009 | /* Add ourselves to inferior_created event chain. | |
2010 | This is needed to handle debugging statically linked programs where | |
2011 | the new_objfile observer won't get called for libpthread. */ | |
76727919 | 2012 | gdb::observers::inferior_created.attach (thread_db_inferior_created); |
fb0e1ba7 | 2013 | } |