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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
b811d2c2 | 3 | Copyright (C) 1999-2020 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" |
268a13a5 | 24 | #include "gdbsupport/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> |
268a13a5 | 49 | #include "gdbsupport/pathstuff.h" |
5045b3d7 | 50 | #include "valprint.h" |
9d636d67 | 51 | #include "cli/cli-style.h" |
979894f2 | 52 | |
17faa917 DJ |
53 | /* GNU/Linux libthread_db support. |
54 | ||
55 | libthread_db is a library, provided along with libpthread.so, which | |
56 | exposes the internals of the thread library to a debugger. It | |
57 | allows GDB to find existing threads, new threads as they are | |
58 | created, thread IDs (usually, the result of pthread_self), and | |
59 | thread-local variables. | |
60 | ||
4a6ed09b PA |
61 | The libthread_db interface originates on Solaris, where it is both |
62 | more powerful and more complicated. This implementation only works | |
63 | for NPTL, the glibc threading library. It assumes that each thread | |
64 | is permanently assigned to a single light-weight process (LWP). At | |
65 | some point it also supported the older LinuxThreads library, but it | |
66 | no longer does. | |
17faa917 DJ |
67 | |
68 | libthread_db-specific information is stored in the "private" field | |
69 | of struct thread_info. When the field is NULL we do not yet have | |
70 | information about the new thread; this could be temporary (created, | |
71 | but the thread library's data structures do not reflect it yet) | |
72 | or permanent (created using clone instead of pthread_create). | |
73 | ||
74 | Process IDs managed by linux-thread-db.c match those used by | |
75 | linux-nat.c: a common PID for all processes, an LWP ID for each | |
76 | thread, and no TID. We save the TID in private. Keeping it out | |
77 | of the ptid_t prevents thread IDs changing when libpthread is | |
78 | loaded or unloaded. */ | |
79 | ||
d9f719f1 PA |
80 | static const target_info thread_db_target_info = { |
81 | "multi-thread", | |
82 | N_("multi-threaded child process."), | |
83 | N_("Threads and pthreads support.") | |
84 | }; | |
85 | ||
f6ac5f3d PA |
86 | class thread_db_target final : public target_ops |
87 | { | |
88 | public: | |
d9f719f1 PA |
89 | const target_info &info () const override |
90 | { return thread_db_target_info; } | |
f6ac5f3d | 91 | |
66b4deae PA |
92 | strata stratum () const override { return thread_stratum; } |
93 | ||
f6ac5f3d PA |
94 | void detach (inferior *, int) override; |
95 | ptid_t wait (ptid_t, struct target_waitstatus *, int) override; | |
96 | void resume (ptid_t, int, enum gdb_signal) override; | |
97 | void mourn_inferior () override; | |
98 | void update_thread_list () override; | |
a068643d | 99 | std::string pid_to_str (ptid_t) override; |
f6ac5f3d PA |
100 | CORE_ADDR get_thread_local_address (ptid_t ptid, |
101 | CORE_ADDR load_module_addr, | |
102 | CORE_ADDR offset) override; | |
103 | const char *extra_thread_info (struct thread_info *) override; | |
104 | ptid_t get_ada_task_ptid (long lwp, long thread) override; | |
105 | ||
106 | thread_info *thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
107 | int handle_len, | |
108 | inferior *inf) override; | |
3d6c6204 | 109 | gdb::byte_vector thread_info_to_thread_handle (struct thread_info *) override; |
f6ac5f3d PA |
110 | }; |
111 | ||
17a37d48 PP |
112 | static char *libthread_db_search_path; |
113 | ||
491144b5 | 114 | /* Set to true if thread_db auto-loading is enabled |
bf88dd68 | 115 | by the "set auto-load libthread-db" command. */ |
491144b5 | 116 | static bool auto_load_thread_db = true; |
bf88dd68 | 117 | |
491144b5 | 118 | /* Set to true if load-time libthread_db tests have been enabled |
85102364 | 119 | by the "maintenance set check-libthread-db" command. */ |
491144b5 | 120 | static bool check_thread_db_on_load = false; |
5045b3d7 | 121 | |
bf88dd68 JK |
122 | /* "show" command for the auto_load_thread_db configuration variable. */ |
123 | ||
124 | static void | |
125 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
126 | struct cmd_list_element *c, const char *value) | |
127 | { | |
128 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
129 | "is %s.\n"), | |
130 | value); | |
131 | } | |
132 | ||
84e578fb | 133 | static void |
eb4c3f4a | 134 | set_libthread_db_search_path (const char *ignored, int from_tty, |
84e578fb DE |
135 | struct cmd_list_element *c) |
136 | { | |
137 | if (*libthread_db_search_path == '\0') | |
138 | { | |
139 | xfree (libthread_db_search_path); | |
140 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
141 | } | |
142 | } | |
143 | ||
02d868e8 PP |
144 | /* If non-zero, print details of libthread_db processing. */ |
145 | ||
ccce17b0 | 146 | static unsigned int libthread_db_debug; |
02d868e8 PP |
147 | |
148 | static void | |
149 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
150 | struct cmd_list_element *c, const char *value) | |
151 | { | |
152 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
153 | } | |
154 | ||
8605d56e AC |
155 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
156 | threads. */ | |
fb0e1ba7 | 157 | |
fb0e1ba7 | 158 | /* This module's target vector. */ |
f6ac5f3d | 159 | static thread_db_target the_thread_db_target; |
fb0e1ba7 | 160 | |
fb0e1ba7 MK |
161 | /* Non-zero if we have determined the signals used by the threads |
162 | library. */ | |
163 | static int thread_signals; | |
164 | static sigset_t thread_stop_set; | |
165 | static sigset_t thread_print_set; | |
166 | ||
d90e17a7 PA |
167 | struct thread_db_info |
168 | { | |
169 | struct thread_db_info *next; | |
170 | ||
5b6d1e4f PA |
171 | /* The target this thread_db_info is bound to. */ |
172 | process_stratum_target *process_target; | |
173 | ||
d90e17a7 PA |
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; | |
a2419b98 | 202 | td_ta_delete_ftype *td_ta_delete_p; |
96e9210f PA |
203 | td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p; |
204 | td_ta_thr_iter_ftype *td_ta_thr_iter_p; | |
96e9210f | 205 | td_thr_get_info_ftype *td_thr_get_info_p; |
96e9210f PA |
206 | td_thr_tls_get_addr_ftype *td_thr_tls_get_addr_p; |
207 | td_thr_tlsbase_ftype *td_thr_tlsbase_p; | |
d90e17a7 PA |
208 | }; |
209 | ||
210 | /* List of known processes using thread_db, and the required | |
211 | bookkeeping. */ | |
212 | struct thread_db_info *thread_db_list; | |
213 | ||
00431a78 PA |
214 | static void thread_db_find_new_threads_1 (thread_info *stopped); |
215 | static void thread_db_find_new_threads_2 (thread_info *stopped, | |
216 | bool until_no_new); | |
d90e17a7 | 217 | |
2db9a427 PA |
218 | static void check_thread_signals (void); |
219 | ||
be550b6e DE |
220 | static struct thread_info *record_thread |
221 | (struct thread_db_info *info, struct thread_info *tp, | |
222 | ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p); | |
2db9a427 | 223 | |
d90e17a7 PA |
224 | /* Add the current inferior to the list of processes using libpthread. |
225 | Return a pointer to the newly allocated object that was added to | |
226 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
227 | LIBTHREAD_DB_SO. */ | |
228 | ||
229 | static struct thread_db_info * | |
230 | add_thread_db_info (void *handle) | |
231 | { | |
8d749320 | 232 | struct thread_db_info *info = XCNEW (struct thread_db_info); |
d90e17a7 | 233 | |
5b6d1e4f | 234 | info->process_target = current_inferior ()->process_target (); |
e99b03dc | 235 | info->pid = inferior_ptid.pid (); |
d90e17a7 | 236 | info->handle = handle; |
856d6f99 PA |
237 | |
238 | /* The workaround works by reading from /proc/pid/status, so it is | |
239 | disabled for core files. */ | |
240 | if (target_has_execution) | |
241 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
242 | |
243 | info->next = thread_db_list; | |
244 | thread_db_list = info; | |
245 | ||
246 | return info; | |
247 | } | |
248 | ||
249 | /* Return the thread_db_info object representing the bookkeeping | |
250 | related to process PID, if any; NULL otherwise. */ | |
251 | ||
252 | static struct thread_db_info * | |
5b6d1e4f | 253 | get_thread_db_info (process_stratum_target *targ, int pid) |
d90e17a7 PA |
254 | { |
255 | struct thread_db_info *info; | |
256 | ||
257 | for (info = thread_db_list; info; info = info->next) | |
5b6d1e4f | 258 | if (targ == info->process_target && pid == info->pid) |
d90e17a7 PA |
259 | return info; |
260 | ||
261 | return NULL; | |
262 | } | |
263 | ||
a2419b98 PW |
264 | static const char *thread_db_err_str (td_err_e err); |
265 | ||
d90e17a7 PA |
266 | /* When PID has exited or has been detached, we no longer want to keep |
267 | track of it as using libpthread. Call this function to discard | |
268 | thread_db related info related to PID. Note that this closes | |
269 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
270 | ||
271 | static void | |
5b6d1e4f | 272 | delete_thread_db_info (process_stratum_target *targ, int pid) |
d90e17a7 PA |
273 | { |
274 | struct thread_db_info *info, *info_prev; | |
275 | ||
276 | info_prev = NULL; | |
277 | ||
278 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
5b6d1e4f | 279 | if (targ == info->process_target && pid == info->pid) |
d90e17a7 PA |
280 | break; |
281 | ||
282 | if (info == NULL) | |
283 | return; | |
284 | ||
a2419b98 PW |
285 | if (info->thread_agent != NULL && info->td_ta_delete_p != NULL) |
286 | { | |
287 | td_err_e err = info->td_ta_delete_p (info->thread_agent); | |
288 | ||
289 | if (err != TD_OK) | |
290 | warning (_("Cannot deregister process %d from libthread_db: %s"), | |
291 | pid, thread_db_err_str (err)); | |
292 | info->thread_agent = NULL; | |
293 | } | |
294 | ||
d90e17a7 PA |
295 | if (info->handle != NULL) |
296 | dlclose (info->handle); | |
297 | ||
bf88dd68 JK |
298 | xfree (info->filename); |
299 | ||
d90e17a7 PA |
300 | if (info_prev) |
301 | info_prev->next = info->next; | |
302 | else | |
303 | thread_db_list = info->next; | |
304 | ||
305 | xfree (info); | |
306 | } | |
fb0e1ba7 | 307 | |
5365276c DJ |
308 | /* Use "struct private_thread_info" to cache thread state. This is |
309 | a substantial optimization. */ | |
310 | ||
7aabaf9d | 311 | struct thread_db_thread_info : public private_thread_info |
fb0e1ba7 | 312 | { |
a2f23071 | 313 | /* Flag set when we see a TD_DEATH event for this thread. */ |
7aabaf9d | 314 | bool dying = false; |
a2f23071 | 315 | |
5365276c | 316 | /* Cached thread state. */ |
7aabaf9d SM |
317 | td_thrhandle_t th {}; |
318 | thread_t tid {}; | |
fb0e1ba7 | 319 | }; |
7aabaf9d SM |
320 | |
321 | static thread_db_thread_info * | |
322 | get_thread_db_thread_info (thread_info *thread) | |
323 | { | |
324 | return static_cast<thread_db_thread_info *> (thread->priv.get ()); | |
325 | } | |
21bf60fe | 326 | |
a121b7c1 | 327 | static const char * |
fb0e1ba7 MK |
328 | thread_db_err_str (td_err_e err) |
329 | { | |
330 | static char buf[64]; | |
331 | ||
332 | switch (err) | |
333 | { | |
334 | case TD_OK: | |
335 | return "generic 'call succeeded'"; | |
336 | case TD_ERR: | |
337 | return "generic error"; | |
338 | case TD_NOTHR: | |
339 | return "no thread to satisfy query"; | |
340 | case TD_NOSV: | |
341 | return "no sync handle to satisfy query"; | |
342 | case TD_NOLWP: | |
343 | return "no LWP to satisfy query"; | |
344 | case TD_BADPH: | |
345 | return "invalid process handle"; | |
346 | case TD_BADTH: | |
347 | return "invalid thread handle"; | |
348 | case TD_BADSH: | |
349 | return "invalid synchronization handle"; | |
350 | case TD_BADTA: | |
351 | return "invalid thread agent"; | |
352 | case TD_BADKEY: | |
353 | return "invalid key"; | |
354 | case TD_NOMSG: | |
355 | return "no event message for getmsg"; | |
356 | case TD_NOFPREGS: | |
357 | return "FPU register set not available"; | |
358 | case TD_NOLIBTHREAD: | |
359 | return "application not linked with libthread"; | |
360 | case TD_NOEVENT: | |
361 | return "requested event is not supported"; | |
362 | case TD_NOCAPAB: | |
363 | return "capability not available"; | |
364 | case TD_DBERR: | |
365 | return "debugger service failed"; | |
366 | case TD_NOAPLIC: | |
367 | return "operation not applicable to"; | |
368 | case TD_NOTSD: | |
369 | return "no thread-specific data for this thread"; | |
370 | case TD_MALLOC: | |
371 | return "malloc failed"; | |
372 | case TD_PARTIALREG: | |
373 | return "only part of register set was written/read"; | |
374 | case TD_NOXREGS: | |
375 | return "X register set not available for this thread"; | |
59f80f10 DJ |
376 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
377 | case TD_NOTALLOC: | |
378 | return "thread has not yet allocated TLS for given module"; | |
379 | #endif | |
380 | #ifdef THREAD_DB_HAS_TD_VERSION | |
381 | case TD_VERSION: | |
382 | return "versions of libpthread and libthread_db do not match"; | |
383 | #endif | |
384 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
385 | case TD_NOTLS: | |
386 | return "there is no TLS segment in the given module"; | |
387 | #endif | |
fb0e1ba7 MK |
388 | default: |
389 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
390 | return buf; | |
391 | } | |
392 | } | |
4105de34 | 393 | |
00431a78 PA |
394 | /* Fetch the user-level thread id of PTID. STOPPED is a stopped |
395 | thread that we can use to access memory. */ | |
fb0e1ba7 | 396 | |
be550b6e | 397 | static struct thread_info * |
00431a78 | 398 | thread_from_lwp (thread_info *stopped, ptid_t ptid) |
fb0e1ba7 | 399 | { |
fb0e1ba7 | 400 | td_thrhandle_t th; |
2db9a427 | 401 | td_thrinfo_t ti; |
fb0e1ba7 | 402 | td_err_e err; |
d90e17a7 | 403 | struct thread_db_info *info; |
2db9a427 | 404 | struct thread_info *tp; |
fb0e1ba7 | 405 | |
6cb9b55b PP |
406 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
407 | th.th_unique = 0; | |
408 | ||
17faa917 DJ |
409 | /* This ptid comes from linux-nat.c, which should always fill in the |
410 | LWP. */ | |
e38504b3 | 411 | gdb_assert (ptid.lwp () != 0); |
fb0e1ba7 | 412 | |
5b6d1e4f | 413 | info = get_thread_db_info (stopped->inf->process_target (), ptid.pid ()); |
d90e17a7 | 414 | |
4c28f408 | 415 | /* Access an lwp we know is stopped. */ |
00431a78 | 416 | info->proc_handle.thread = stopped; |
e38504b3 | 417 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid.lwp (), |
dfd4cc63 | 418 | &th); |
fb0e1ba7 | 419 | if (err != TD_OK) |
8a3fe4f8 | 420 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
e38504b3 | 421 | ptid.lwp (), thread_db_err_str (err)); |
fb0e1ba7 | 422 | |
2db9a427 PA |
423 | err = info->td_thr_get_info_p (&th, &ti); |
424 | if (err != TD_OK) | |
425 | error (_("thread_get_info_callback: cannot get thread info: %s"), | |
426 | thread_db_err_str (err)); | |
427 | ||
428 | /* Fill the cache. */ | |
5b6d1e4f | 429 | tp = find_thread_ptid (stopped->inf->process_target (), ptid); |
be550b6e | 430 | return record_thread (info, tp, ptid, &th, &ti); |
fb0e1ba7 MK |
431 | } |
432 | \f | |
433 | ||
2db9a427 PA |
434 | /* See linux-nat.h. */ |
435 | ||
4c28f408 | 436 | int |
2db9a427 | 437 | thread_db_notice_clone (ptid_t parent, ptid_t child) |
4c28f408 | 438 | { |
d90e17a7 | 439 | struct thread_db_info *info; |
4c28f408 | 440 | |
5b6d1e4f | 441 | info = get_thread_db_info (linux_target, child.pid ()); |
d90e17a7 PA |
442 | |
443 | if (info == NULL) | |
4c28f408 PA |
444 | return 0; |
445 | ||
5b6d1e4f | 446 | thread_info *stopped = find_thread_ptid (linux_target, parent); |
4c28f408 | 447 | |
00431a78 PA |
448 | thread_from_lwp (stopped, child); |
449 | ||
450 | /* If we do not know about the main thread's pthread info yet, this | |
451 | would be a good time to find it. */ | |
452 | thread_from_lwp (stopped, parent); | |
4c28f408 PA |
453 | return 1; |
454 | } | |
455 | ||
5220ea4c AC |
456 | static void * |
457 | verbose_dlsym (void *handle, const char *name) | |
458 | { | |
459 | void *sym = dlsym (handle, name); | |
460 | if (sym == NULL) | |
3e43a32a MS |
461 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
462 | name, dlerror ()); | |
5220ea4c AC |
463 | return sym; |
464 | } | |
465 | ||
fcb44371 JK |
466 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
467 | return 1 if this version is lower (and not equal) to | |
468 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
469 | ||
470 | static int | |
471 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
472 | { | |
3b7344d5 | 473 | struct bound_minimal_symbol version_msym; |
fcb44371 | 474 | CORE_ADDR version_addr; |
e83e4e24 | 475 | gdb::unique_xmalloc_ptr<char> version; |
fcb44371 JK |
476 | int err, got, retval = 0; |
477 | ||
478 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 479 | if (version_msym.minsym == NULL) |
fcb44371 JK |
480 | return 0; |
481 | ||
77e371c0 | 482 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
fcb44371 | 483 | got = target_read_string (version_addr, &version, 32, &err); |
e83e4e24 | 484 | if (err == 0 && memchr (version.get (), 0, got) == version.get () + got - 1) |
fcb44371 JK |
485 | { |
486 | int major, minor; | |
487 | ||
e83e4e24 | 488 | retval = (sscanf (version.get (), "%d.%d", &major, &minor) == 2 |
fcb44371 JK |
489 | && (major < ver_major_min |
490 | || (major == ver_major_min && minor < ver_minor_min))); | |
491 | } | |
fcb44371 JK |
492 | |
493 | return retval; | |
494 | } | |
495 | ||
fcb44371 JK |
496 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
497 | if appropriate. | |
456b0e24 | 498 | |
fcb44371 JK |
499 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
500 | otherwise. */ | |
501 | ||
502 | static int | |
00431a78 | 503 | thread_db_find_new_threads_silently (thread_info *stopped) |
456b0e24 | 504 | { |
456b0e24 | 505 | |
a70b8144 | 506 | try |
456b0e24 | 507 | { |
00431a78 | 508 | thread_db_find_new_threads_2 (stopped, true); |
456b0e24 PP |
509 | } |
510 | ||
230d2906 | 511 | catch (const gdb_exception_error &except) |
e0881a8e | 512 | { |
fcb44371 | 513 | if (libthread_db_debug) |
883ed13e | 514 | exception_fprintf (gdb_stdlog, except, |
fcb44371 JK |
515 | "Warning: thread_db_find_new_threads_silently: "); |
516 | ||
517 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
518 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
519 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
520 | executables if td_thr_get_info is called before glibc has initialized | |
521 | itself. | |
522 | ||
523 | If the nptl bug is NOT present in the inferior and still thread_db | |
524 | reports an error return 1. It means the inferior has corrupted thread | |
525 | list and GDB should fall back only to LWPs. | |
526 | ||
527 | If the nptl bug is present in the inferior return 0 to silently ignore | |
528 | such errors, and let gdb enumerate threads again later. In such case | |
529 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
530 | corrupted. For core files it does not apply, no 'later enumeration' |
531 | is possible. */ | |
fcb44371 | 532 | |
889003ed | 533 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
534 | { |
535 | exception_fprintf (gdb_stderr, except, | |
536 | _("Warning: couldn't activate thread debugging " | |
537 | "using libthread_db: ")); | |
538 | return 1; | |
539 | } | |
e0881a8e | 540 | } |
492d29ea | 541 | |
fcb44371 | 542 | return 0; |
456b0e24 PP |
543 | } |
544 | ||
d90e17a7 PA |
545 | /* Lookup a library in which given symbol resides. |
546 | Note: this is looking in GDB process, not in the inferior. | |
547 | Returns library name, or NULL. */ | |
548 | ||
549 | static const char * | |
550 | dladdr_to_soname (const void *addr) | |
551 | { | |
552 | Dl_info info; | |
553 | ||
554 | if (dladdr (addr, &info) != 0) | |
555 | return info.dli_fname; | |
556 | return NULL; | |
557 | } | |
558 | ||
5045b3d7 GB |
559 | /* State for check_thread_db_callback. */ |
560 | ||
561 | struct check_thread_db_info | |
562 | { | |
563 | /* The libthread_db under test. */ | |
564 | struct thread_db_info *info; | |
565 | ||
566 | /* True if progress should be logged. */ | |
567 | bool log_progress; | |
568 | ||
569 | /* True if the callback was called. */ | |
570 | bool threads_seen; | |
571 | ||
572 | /* Name of last libthread_db function called. */ | |
573 | const char *last_call; | |
574 | ||
575 | /* Value returned by last libthread_db call. */ | |
576 | td_err_e last_result; | |
577 | }; | |
578 | ||
579 | static struct check_thread_db_info *tdb_testinfo; | |
580 | ||
581 | /* Callback for check_thread_db. */ | |
582 | ||
583 | static int | |
584 | check_thread_db_callback (const td_thrhandle_t *th, void *arg) | |
585 | { | |
586 | gdb_assert (tdb_testinfo != NULL); | |
587 | tdb_testinfo->threads_seen = true; | |
588 | ||
589 | #define LOG(fmt, args...) \ | |
590 | do \ | |
591 | { \ | |
592 | if (tdb_testinfo->log_progress) \ | |
593 | { \ | |
594 | debug_printf (fmt, ## args); \ | |
595 | gdb_flush (gdb_stdlog); \ | |
596 | } \ | |
597 | } \ | |
598 | while (0) | |
599 | ||
600 | #define CHECK_1(expr, args...) \ | |
601 | do \ | |
602 | { \ | |
603 | if (!(expr)) \ | |
604 | { \ | |
605 | LOG (" ... FAIL!\n"); \ | |
606 | error (args); \ | |
607 | } \ | |
608 | } \ | |
609 | while (0) | |
610 | ||
611 | #define CHECK(expr) \ | |
612 | CHECK_1 (expr, "(%s) == false", #expr) | |
613 | ||
614 | #define CALL_UNCHECKED(func, args...) \ | |
615 | do \ | |
616 | { \ | |
617 | tdb_testinfo->last_call = #func; \ | |
618 | tdb_testinfo->last_result \ | |
619 | = tdb_testinfo->info->func ## _p (args); \ | |
620 | } \ | |
621 | while (0) | |
622 | ||
623 | #define CHECK_CALL() \ | |
624 | CHECK_1 (tdb_testinfo->last_result == TD_OK, \ | |
625 | _("%s failed: %s"), \ | |
626 | tdb_testinfo->last_call, \ | |
627 | thread_db_err_str (tdb_testinfo->last_result)) \ | |
628 | ||
629 | #define CALL(func, args...) \ | |
630 | do \ | |
631 | { \ | |
632 | CALL_UNCHECKED (func, args); \ | |
633 | CHECK_CALL (); \ | |
634 | } \ | |
635 | while (0) | |
636 | ||
637 | LOG (" Got thread"); | |
638 | ||
639 | /* Check td_ta_thr_iter passed consistent arguments. */ | |
640 | CHECK (th != NULL); | |
641 | CHECK (arg == (void *) tdb_testinfo); | |
642 | CHECK (th->th_ta_p == tdb_testinfo->info->thread_agent); | |
643 | ||
644 | LOG (" %s", core_addr_to_string_nz ((CORE_ADDR) th->th_unique)); | |
645 | ||
646 | /* Check td_thr_get_info. */ | |
647 | td_thrinfo_t ti; | |
648 | CALL (td_thr_get_info, th, &ti); | |
649 | ||
650 | LOG (" => %d", ti.ti_lid); | |
651 | ||
652 | CHECK (ti.ti_ta_p == th->th_ta_p); | |
653 | CHECK (ti.ti_tid == (thread_t) th->th_unique); | |
654 | ||
655 | /* Check td_ta_map_lwp2thr. */ | |
656 | td_thrhandle_t th2; | |
657 | memset (&th2, 23, sizeof (td_thrhandle_t)); | |
658 | CALL_UNCHECKED (td_ta_map_lwp2thr, th->th_ta_p, ti.ti_lid, &th2); | |
659 | ||
660 | if (tdb_testinfo->last_result == TD_ERR && !target_has_execution) | |
661 | { | |
662 | /* Some platforms require execution for td_ta_map_lwp2thr. */ | |
663 | LOG (_("; can't map_lwp2thr")); | |
664 | } | |
665 | else | |
666 | { | |
667 | CHECK_CALL (); | |
668 | ||
669 | LOG (" => %s", core_addr_to_string_nz ((CORE_ADDR) th2.th_unique)); | |
670 | ||
671 | CHECK (memcmp (th, &th2, sizeof (td_thrhandle_t)) == 0); | |
672 | } | |
673 | ||
674 | /* Attempt TLS access. Assuming errno is TLS, this calls | |
675 | thread_db_get_thread_local_address, which in turn calls | |
676 | td_thr_tls_get_addr for live inferiors or td_thr_tlsbase | |
677 | for core files. This test is skipped if the thread has | |
678 | not been recorded; proceeding in that case would result | |
679 | in the test having the side-effect of noticing threads | |
680 | which seems wrong. | |
681 | ||
682 | Note that in glibc's libthread_db td_thr_tls_get_addr is | |
683 | a thin wrapper around td_thr_tlsbase; this check always | |
684 | hits the bulk of the code. | |
685 | ||
686 | Note also that we don't actually check any libthread_db | |
687 | calls are made, we just assume they were; future changes | |
688 | to how GDB accesses TLS could result in this passing | |
689 | without exercising the calls it's supposed to. */ | |
fd79271b | 690 | ptid_t ptid = ptid_t (tdb_testinfo->info->pid, ti.ti_lid, 0); |
5b6d1e4f | 691 | thread_info *thread_info = find_thread_ptid (linux_target, ptid); |
5045b3d7 GB |
692 | if (thread_info != NULL && thread_info->priv != NULL) |
693 | { | |
694 | LOG ("; errno"); | |
695 | ||
696 | scoped_restore_current_thread restore_current_thread; | |
5b6d1e4f | 697 | switch_to_thread (thread_info); |
5045b3d7 GB |
698 | |
699 | expression_up expr = parse_expression ("(int) errno"); | |
700 | struct value *val = evaluate_expression (expr.get ()); | |
701 | ||
702 | if (tdb_testinfo->log_progress) | |
703 | { | |
704 | struct value_print_options opts; | |
705 | ||
706 | get_user_print_options (&opts); | |
707 | LOG (" = "); | |
708 | value_print (val, gdb_stdlog, &opts); | |
709 | } | |
710 | } | |
711 | ||
712 | LOG (" ... OK\n"); | |
713 | ||
714 | #undef LOG | |
715 | #undef CHECK_1 | |
716 | #undef CHECK | |
717 | #undef CALL_UNCHECKED | |
718 | #undef CHECK_CALL | |
719 | #undef CALL | |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
724 | /* Run integrity checks on the dlopen()ed libthread_db described by | |
725 | INFO. Returns true on success, displays a warning and returns | |
726 | false on failure. Logs progress messages to gdb_stdlog during | |
727 | the test if LOG_PROGRESS is true. */ | |
728 | ||
729 | static bool | |
730 | check_thread_db (struct thread_db_info *info, bool log_progress) | |
731 | { | |
732 | bool test_passed = true; | |
733 | ||
734 | if (log_progress) | |
735 | debug_printf (_("Running libthread_db integrity checks:\n")); | |
736 | ||
737 | /* GDB avoids using td_ta_thr_iter wherever possible (see comment | |
738 | in try_thread_db_load_1 below) so in order to test it we may | |
739 | have to locate it ourselves. */ | |
740 | td_ta_thr_iter_ftype *td_ta_thr_iter_p = info->td_ta_thr_iter_p; | |
741 | if (td_ta_thr_iter_p == NULL) | |
742 | { | |
743 | void *thr_iter = verbose_dlsym (info->handle, "td_ta_thr_iter"); | |
744 | if (thr_iter == NULL) | |
745 | return 0; | |
746 | ||
747 | td_ta_thr_iter_p = (td_ta_thr_iter_ftype *) thr_iter; | |
748 | } | |
749 | ||
750 | /* Set up the test state we share with the callback. */ | |
751 | gdb_assert (tdb_testinfo == NULL); | |
752 | struct check_thread_db_info tdb_testinfo_buf; | |
753 | tdb_testinfo = &tdb_testinfo_buf; | |
754 | ||
755 | memset (tdb_testinfo, 0, sizeof (struct check_thread_db_info)); | |
756 | tdb_testinfo->info = info; | |
757 | tdb_testinfo->log_progress = log_progress; | |
758 | ||
759 | /* td_ta_thr_iter shouldn't be used on running processes. Note that | |
760 | it's possible the inferior will stop midway through modifying one | |
761 | of its thread lists, in which case the check will spuriously | |
762 | fail. */ | |
763 | linux_stop_and_wait_all_lwps (); | |
764 | ||
a70b8144 | 765 | try |
5045b3d7 GB |
766 | { |
767 | td_err_e err = td_ta_thr_iter_p (info->thread_agent, | |
768 | check_thread_db_callback, | |
769 | tdb_testinfo, | |
770 | TD_THR_ANY_STATE, | |
771 | TD_THR_LOWEST_PRIORITY, | |
772 | TD_SIGNO_MASK, | |
773 | TD_THR_ANY_USER_FLAGS); | |
774 | ||
775 | if (err != TD_OK) | |
776 | error (_("td_ta_thr_iter failed: %s"), thread_db_err_str (err)); | |
777 | ||
778 | if (!tdb_testinfo->threads_seen) | |
779 | error (_("no threads seen")); | |
780 | } | |
230d2906 | 781 | catch (const gdb_exception_error &except) |
5045b3d7 GB |
782 | { |
783 | if (warning_pre_print) | |
784 | fputs_unfiltered (warning_pre_print, gdb_stderr); | |
785 | ||
786 | exception_fprintf (gdb_stderr, except, | |
787 | _("libthread_db integrity checks failed: ")); | |
788 | ||
789 | test_passed = false; | |
790 | } | |
5045b3d7 GB |
791 | |
792 | if (test_passed && log_progress) | |
793 | debug_printf (_("libthread_db integrity checks passed.\n")); | |
794 | ||
795 | tdb_testinfo = NULL; | |
796 | ||
797 | linux_unstop_all_lwps (); | |
798 | ||
799 | return test_passed; | |
800 | } | |
801 | ||
2471d008 | 802 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
9ddc1af1 | 803 | Return true on success. |
17a37d48 PP |
804 | Failure could happen if libthread_db does not have symbols we expect, |
805 | or when it refuses to work with the current inferior (e.g. due to | |
806 | version mismatch between libthread_db and libpthread). */ | |
807 | ||
9ddc1af1 | 808 | static bool |
d90e17a7 | 809 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
810 | { |
811 | td_err_e err; | |
812 | ||
813 | /* Initialize pointers to the dynamic library functions we will use. | |
814 | Essential functions first. */ | |
815 | ||
96e9210f PA |
816 | #define TDB_VERBOSE_DLSYM(info, func) \ |
817 | info->func ## _p = (func ## _ftype *) verbose_dlsym (info->handle, #func) | |
818 | ||
819 | #define TDB_DLSYM(info, func) \ | |
820 | info->func ## _p = (func ## _ftype *) dlsym (info->handle, #func) | |
821 | ||
822 | #define CHK(a) \ | |
823 | do \ | |
824 | { \ | |
825 | if ((a) == NULL) \ | |
9ddc1af1 | 826 | return false; \ |
96e9210f PA |
827 | } while (0) |
828 | ||
829 | CHK (TDB_VERBOSE_DLSYM (info, td_init)); | |
17a37d48 | 830 | |
d90e17a7 | 831 | err = info->td_init_p (); |
17a37d48 PP |
832 | if (err != TD_OK) |
833 | { | |
3e43a32a MS |
834 | warning (_("Cannot initialize libthread_db: %s"), |
835 | thread_db_err_str (err)); | |
9ddc1af1 | 836 | return false; |
17a37d48 PP |
837 | } |
838 | ||
96e9210f | 839 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_new)); |
17a37d48 PP |
840 | |
841 | /* Initialize the structure that identifies the child process. */ | |
00431a78 | 842 | info->proc_handle.thread = inferior_thread (); |
17a37d48 PP |
843 | |
844 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 845 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
846 | if (err != TD_OK) |
847 | { | |
02d868e8 | 848 | if (libthread_db_debug) |
883ed13e PA |
849 | fprintf_unfiltered (gdb_stdlog, _("td_ta_new failed: %s\n"), |
850 | thread_db_err_str (err)); | |
17a37d48 PP |
851 | else |
852 | switch (err) | |
853 | { | |
854 | case TD_NOLIBTHREAD: | |
855 | #ifdef THREAD_DB_HAS_TD_VERSION | |
856 | case TD_VERSION: | |
857 | #endif | |
858 | /* The errors above are not unexpected and silently ignored: | |
859 | they just mean we haven't found correct version of | |
860 | libthread_db yet. */ | |
861 | break; | |
862 | default: | |
863 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
864 | } | |
9ddc1af1 | 865 | return false; |
17a37d48 PP |
866 | } |
867 | ||
96e9210f PA |
868 | /* These are essential. */ |
869 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_map_lwp2thr)); | |
96e9210f | 870 | CHK (TDB_VERBOSE_DLSYM (info, td_thr_get_info)); |
17a37d48 PP |
871 | |
872 | /* These are not essential. */ | |
96e9210f PA |
873 | TDB_DLSYM (info, td_thr_tls_get_addr); |
874 | TDB_DLSYM (info, td_thr_tlsbase); | |
a2419b98 | 875 | TDB_DLSYM (info, td_ta_delete); |
96e9210f | 876 | |
2db9a427 PA |
877 | /* It's best to avoid td_ta_thr_iter if possible. That walks data |
878 | structures in the inferior's address space that may be corrupted, | |
879 | or, if the target is running, may change while we walk them. If | |
880 | there's execution (and /proc is mounted), then we're already | |
881 | attached to all LWPs. Use thread_from_lwp, which uses | |
882 | td_ta_map_lwp2thr instead, which does not walk the thread list. | |
883 | ||
884 | td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that | |
885 | currently on core targets, as it uses ptrace directly. */ | |
886 | if (target_has_execution | |
e99b03dc | 887 | && linux_proc_task_list_dir_exists (inferior_ptid.pid ())) |
1eb2dbb8 PA |
888 | info->td_ta_thr_iter_p = NULL; |
889 | else | |
890 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter)); | |
891 | ||
892 | #undef TDB_VERBOSE_DLSYM | |
893 | #undef TDB_DLSYM | |
894 | #undef CHK | |
895 | ||
5045b3d7 GB |
896 | /* Run integrity checks if requested. */ |
897 | if (check_thread_db_on_load) | |
898 | { | |
899 | if (!check_thread_db (info, libthread_db_debug)) | |
9ddc1af1 | 900 | return false; |
5045b3d7 GB |
901 | } |
902 | ||
1eb2dbb8 | 903 | if (info->td_ta_thr_iter_p == NULL) |
2db9a427 PA |
904 | { |
905 | struct lwp_info *lp; | |
e99b03dc | 906 | int pid = inferior_ptid.pid (); |
00431a78 | 907 | thread_info *curr_thread = inferior_thread (); |
2db9a427 PA |
908 | |
909 | linux_stop_and_wait_all_lwps (); | |
910 | ||
911 | ALL_LWPS (lp) | |
e99b03dc | 912 | if (lp->ptid.pid () == pid) |
00431a78 | 913 | thread_from_lwp (curr_thread, lp->ptid); |
2db9a427 PA |
914 | |
915 | linux_unstop_all_lwps (); | |
916 | } | |
00431a78 | 917 | else if (thread_db_find_new_threads_silently (inferior_thread ()) != 0) |
fcb44371 JK |
918 | { |
919 | /* Even if libthread_db initializes, if the thread list is | |
920 | corrupted, we'd not manage to list any threads. Better reject this | |
921 | thread_db, and fall back to at least listing LWPs. */ | |
9ddc1af1 | 922 | return false; |
fcb44371 JK |
923 | } |
924 | ||
17a37d48 PP |
925 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
926 | ||
883ed13e | 927 | if (*libthread_db_search_path || libthread_db_debug) |
d90e17a7 | 928 | { |
883ed13e | 929 | struct ui_file *file; |
d90e17a7 | 930 | const char *library; |
17a37d48 | 931 | |
f8708a14 | 932 | library = dladdr_to_soname ((const void *) *info->td_ta_new_p); |
d90e17a7 PA |
933 | if (library == NULL) |
934 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 935 | |
883ed13e PA |
936 | /* If we'd print this to gdb_stdout when debug output is |
937 | disabled, still print it to gdb_stdout if debug output is | |
938 | enabled. User visible output should not depend on debug | |
939 | settings. */ | |
940 | file = *libthread_db_search_path != '\0' ? gdb_stdout : gdb_stdlog; | |
9d636d67 TT |
941 | fprintf_unfiltered (file, |
942 | _("Using host libthread_db library \"%ps\".\n"), | |
943 | styled_string (file_name_style.style (), library)); | |
d90e17a7 | 944 | } |
17a37d48 | 945 | |
d90e17a7 | 946 | /* The thread library was detected. Activate the thread_db target |
5b6d1e4f PA |
947 | for this process. */ |
948 | push_target (&the_thread_db_target); | |
9ddc1af1 | 949 | return true; |
17a37d48 PP |
950 | } |
951 | ||
952 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
953 | relative, or just LIBTHREAD_DB. */ | |
954 | ||
9ddc1af1 SM |
955 | static bool |
956 | try_thread_db_load (const char *library, bool check_auto_load_safe) | |
17a37d48 PP |
957 | { |
958 | void *handle; | |
d90e17a7 | 959 | struct thread_db_info *info; |
17a37d48 | 960 | |
02d868e8 | 961 | if (libthread_db_debug) |
883ed13e PA |
962 | fprintf_unfiltered (gdb_stdlog, |
963 | _("Trying host libthread_db library: %s.\n"), | |
964 | library); | |
fde4f8ed JK |
965 | |
966 | if (check_auto_load_safe) | |
967 | { | |
968 | if (access (library, R_OK) != 0) | |
969 | { | |
970 | /* Do not print warnings by file_is_auto_load_safe if the library does | |
971 | not exist at this place. */ | |
972 | if (libthread_db_debug) | |
883ed13e PA |
973 | fprintf_unfiltered (gdb_stdlog, _("open failed: %s.\n"), |
974 | safe_strerror (errno)); | |
9ddc1af1 | 975 | return false; |
fde4f8ed JK |
976 | } |
977 | ||
978 | if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db " | |
979 | "library \"%s\" from explicit " | |
980 | "directory.\n"), | |
981 | library)) | |
9ddc1af1 | 982 | return false; |
fde4f8ed JK |
983 | } |
984 | ||
17a37d48 PP |
985 | handle = dlopen (library, RTLD_NOW); |
986 | if (handle == NULL) | |
987 | { | |
02d868e8 | 988 | if (libthread_db_debug) |
883ed13e | 989 | fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ()); |
9ddc1af1 | 990 | return false; |
17a37d48 PP |
991 | } |
992 | ||
02d868e8 | 993 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
994 | { |
995 | void *td_init; | |
996 | ||
997 | td_init = dlsym (handle, "td_init"); | |
998 | if (td_init != NULL) | |
999 | { | |
1000 | const char *const libpath = dladdr_to_soname (td_init); | |
1001 | ||
1002 | if (libpath != NULL) | |
883ed13e | 1003 | fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"), |
17a37d48 PP |
1004 | library, libpath); |
1005 | } | |
1006 | } | |
1007 | ||
d90e17a7 PA |
1008 | info = add_thread_db_info (handle); |
1009 | ||
bf88dd68 JK |
1010 | /* Do not save system library name, that one is always trusted. */ |
1011 | if (strchr (library, '/') != NULL) | |
14278e1f | 1012 | info->filename = gdb_realpath (library).release (); |
bf88dd68 | 1013 | |
d90e17a7 | 1014 | if (try_thread_db_load_1 (info)) |
9ddc1af1 | 1015 | return true; |
17a37d48 PP |
1016 | |
1017 | /* This library "refused" to work on current inferior. */ | |
5b6d1e4f PA |
1018 | delete_thread_db_info (current_inferior ()->process_target (), |
1019 | inferior_ptid.pid ()); | |
9ddc1af1 | 1020 | return false; |
17a37d48 PP |
1021 | } |
1022 | ||
290351b8 | 1023 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
1024 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
1025 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
1026 | The result is true for success. */ |
1027 | ||
9ddc1af1 | 1028 | static bool |
e6712ff1 | 1029 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 1030 | { |
4262abfb | 1031 | const char *obj_name = objfile_name (obj); |
290351b8 | 1032 | |
4262abfb | 1033 | if (obj_name[0] != '/') |
290351b8 DE |
1034 | { |
1035 | warning (_("Expected absolute pathname for libpthread in the" | |
9d636d67 TT |
1036 | " inferior, but got %ps."), |
1037 | styled_string (file_name_style.style (), obj_name)); | |
9ddc1af1 | 1038 | return false; |
290351b8 | 1039 | } |
05386e9e | 1040 | |
9b292f68 TT |
1041 | std::string path = obj_name; |
1042 | size_t cp = path.rfind ('/'); | |
05386e9e | 1043 | /* This should at minimum hit the first character. */ |
9b292f68 TT |
1044 | gdb_assert (cp != std::string::npos); |
1045 | path.resize (cp + 1); | |
e6712ff1 | 1046 | if (subdir != NULL) |
9b292f68 TT |
1047 | path = path + subdir + "/"; |
1048 | path += LIBTHREAD_DB_SO; | |
bccbefd2 | 1049 | |
9ddc1af1 | 1050 | return try_thread_db_load (path.c_str (), true); |
290351b8 DE |
1051 | } |
1052 | ||
98a5dd13 | 1053 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
1054 | Look for libthread_db in directory(libpthread)/SUBDIR. |
1055 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
1056 | The result is true for success. */ |
1057 | ||
9ddc1af1 | 1058 | static bool |
e6712ff1 | 1059 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 | 1060 | { |
bf88dd68 | 1061 | if (!auto_load_thread_db) |
9ddc1af1 | 1062 | return false; |
bf88dd68 | 1063 | |
2030c079 | 1064 | for (objfile *obj : current_program_space->objfiles ()) |
4262abfb | 1065 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 1066 | { |
e6712ff1 | 1067 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
9ddc1af1 | 1068 | return true; |
290351b8 DE |
1069 | |
1070 | /* We may have found the separate-debug-info version of | |
1071 | libpthread, and it may live in a directory without a matching | |
1072 | libthread_db. */ | |
1073 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
1074 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
1075 | subdir); | |
290351b8 | 1076 | |
9ddc1af1 | 1077 | return false; |
98a5dd13 DE |
1078 | } |
1079 | ||
9ddc1af1 | 1080 | return false; |
98a5dd13 DE |
1081 | } |
1082 | ||
1083 | /* Handle $sdir in libthread-db-search-path. | |
1084 | Look for libthread_db in the system dirs, or wherever a plain | |
1085 | dlopen(file_without_path) will look. | |
1086 | The result is true for success. */ | |
1087 | ||
9ddc1af1 | 1088 | static bool |
98a5dd13 DE |
1089 | try_thread_db_load_from_sdir (void) |
1090 | { | |
9ddc1af1 | 1091 | return try_thread_db_load (LIBTHREAD_DB_SO, false); |
98a5dd13 DE |
1092 | } |
1093 | ||
1094 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
1095 | The result is true for success. */ | |
1096 | ||
9ddc1af1 | 1097 | static bool |
98a5dd13 DE |
1098 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) |
1099 | { | |
bf88dd68 | 1100 | if (!auto_load_thread_db) |
9ddc1af1 | 1101 | return false; |
bf88dd68 | 1102 | |
9b292f68 | 1103 | std::string path = std::string (dir, dir_len) + "/" + LIBTHREAD_DB_SO; |
bccbefd2 | 1104 | |
9ddc1af1 | 1105 | return try_thread_db_load (path.c_str (), true); |
98a5dd13 DE |
1106 | } |
1107 | ||
17a37d48 | 1108 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
1109 | to work on current inferior. |
1110 | The result is true for success. */ | |
17a37d48 | 1111 | |
9ddc1af1 | 1112 | static bool |
17a37d48 PP |
1113 | thread_db_load_search (void) |
1114 | { | |
9ddc1af1 | 1115 | bool rc = false; |
17a37d48 | 1116 | |
e80aaf61 SM |
1117 | std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec |
1118 | = dirnames_to_char_ptr_vec (libthread_db_search_path); | |
e6712ff1 | 1119 | |
e80aaf61 | 1120 | for (const gdb::unique_xmalloc_ptr<char> &this_dir_up : dir_vec) |
17a37d48 | 1121 | { |
e80aaf61 | 1122 | const char *this_dir = this_dir_up.get (); |
e6712ff1 | 1123 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 1124 | size_t this_dir_len; |
e0881a8e | 1125 | |
e6712ff1 | 1126 | this_dir_len = strlen (this_dir); |
17a37d48 | 1127 | |
e6712ff1 DE |
1128 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
1129 | && (this_dir[pdir_len] == '\0' | |
1130 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 1131 | { |
9b292f68 | 1132 | const char *subdir = NULL; |
e6712ff1 | 1133 | |
9b292f68 | 1134 | std::string subdir_holder; |
e6712ff1 | 1135 | if (this_dir[pdir_len] == '/') |
98a5dd13 | 1136 | { |
9b292f68 TT |
1137 | subdir_holder = std::string (this_dir + pdir_len + 1); |
1138 | subdir = subdir_holder.c_str (); | |
98a5dd13 | 1139 | } |
e6712ff1 | 1140 | rc = try_thread_db_load_from_pdir (subdir); |
e6712ff1 DE |
1141 | if (rc) |
1142 | break; | |
17a37d48 | 1143 | } |
e6712ff1 | 1144 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
1145 | { |
1146 | if (try_thread_db_load_from_sdir ()) | |
1147 | { | |
1148 | rc = 1; | |
1149 | break; | |
1150 | } | |
1151 | } | |
1152 | else | |
17a37d48 | 1153 | { |
98a5dd13 DE |
1154 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
1155 | { | |
1156 | rc = 1; | |
1157 | break; | |
1158 | } | |
17a37d48 PP |
1159 | } |
1160 | } | |
98a5dd13 DE |
1161 | |
1162 | if (libthread_db_debug) | |
883ed13e PA |
1163 | fprintf_unfiltered (gdb_stdlog, |
1164 | _("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1165 | return rc; |
1166 | } | |
1167 | ||
9ddc1af1 | 1168 | /* Return true if the inferior has a libpthread. */ |
98a5dd13 | 1169 | |
9ddc1af1 | 1170 | static bool |
98a5dd13 DE |
1171 | has_libpthread (void) |
1172 | { | |
2030c079 | 1173 | for (objfile *obj : current_program_space->objfiles ()) |
4262abfb | 1174 | if (libpthread_name_p (objfile_name (obj))) |
9ddc1af1 | 1175 | return true; |
98a5dd13 | 1176 | |
9ddc1af1 | 1177 | return false; |
98a5dd13 DE |
1178 | } |
1179 | ||
17a37d48 | 1180 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1181 | Return 1 on success. */ |
17a37d48 | 1182 | |
9ddc1af1 | 1183 | static bool |
17a37d48 PP |
1184 | thread_db_load (void) |
1185 | { | |
d90e17a7 | 1186 | struct thread_db_info *info; |
17a37d48 | 1187 | |
5b6d1e4f PA |
1188 | info = get_thread_db_info (current_inferior ()->process_target (), |
1189 | inferior_ptid.pid ()); | |
d90e17a7 PA |
1190 | |
1191 | if (info != NULL) | |
9ddc1af1 | 1192 | return true; |
17a37d48 | 1193 | |
856d6f99 PA |
1194 | /* Don't attempt to use thread_db on executables not running |
1195 | yet. */ | |
1196 | if (!target_has_registers) | |
9ddc1af1 | 1197 | return false; |
17a37d48 PP |
1198 | |
1199 | /* Don't attempt to use thread_db for remote targets. */ | |
f6ac5f3d | 1200 | if (!(target_can_run () || core_bfd)) |
9ddc1af1 | 1201 | return false; |
17a37d48 PP |
1202 | |
1203 | if (thread_db_load_search ()) | |
9ddc1af1 | 1204 | return true; |
17a37d48 | 1205 | |
98a5dd13 DE |
1206 | /* We couldn't find a libthread_db. |
1207 | If the inferior has a libpthread warn the user. */ | |
1208 | if (has_libpthread ()) | |
1209 | { | |
1210 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1211 | " library, thread debugging will not be available.")); | |
9ddc1af1 | 1212 | return false; |
17a37d48 | 1213 | } |
98a5dd13 | 1214 | |
17a37d48 PP |
1215 | /* Either this executable isn't using libpthread at all, or it is |
1216 | statically linked. Since we can't easily distinguish these two cases, | |
1217 | no warning is issued. */ | |
9ddc1af1 | 1218 | return false; |
17a37d48 PP |
1219 | } |
1220 | ||
fb0e1ba7 MK |
1221 | static void |
1222 | check_thread_signals (void) | |
1223 | { | |
21bf60fe | 1224 | if (!thread_signals) |
fb0e1ba7 MK |
1225 | { |
1226 | sigset_t mask; | |
1227 | int i; | |
1228 | ||
669211f5 | 1229 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1230 | sigemptyset (&thread_stop_set); |
1231 | sigemptyset (&thread_print_set); | |
1232 | ||
b9569773 | 1233 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1234 | { |
1235 | if (sigismember (&mask, i)) | |
1236 | { | |
2ea28649 | 1237 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 1238 | sigaddset (&thread_stop_set, i); |
2ea28649 | 1239 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
1240 | sigaddset (&thread_print_set, i); |
1241 | thread_signals = 1; | |
1242 | } | |
1243 | } | |
1244 | } | |
fb0e1ba7 MK |
1245 | } |
1246 | ||
0ec9a092 DJ |
1247 | /* Check whether thread_db is usable. This function is called when |
1248 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1249 | and when new shared libraries are loaded into a running process. */ | |
1250 | ||
1251 | void | |
1252 | check_for_thread_db (void) | |
fb0e1ba7 | 1253 | { |
b5057acd | 1254 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1255 | if (!thread_db_load ()) |
b5057acd | 1256 | return; |
0ec9a092 DJ |
1257 | } |
1258 | ||
0838fb57 DE |
1259 | /* This function is called via the new_objfile observer. */ |
1260 | ||
0ec9a092 DJ |
1261 | static void |
1262 | thread_db_new_objfile (struct objfile *objfile) | |
1263 | { | |
d90e17a7 PA |
1264 | /* This observer must always be called with inferior_ptid set |
1265 | correctly. */ | |
1266 | ||
0838fb57 | 1267 | if (objfile != NULL |
fcb44371 | 1268 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 1269 | loaded (and notified without successful thread_db initialization) |
76727919 | 1270 | the time gdb::observers::new_objfile.notify is called for the library itself. |
fcb44371 JK |
1271 | Static executables have their separate debug info loaded already |
1272 | before the inferior has started. */ | |
1273 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1274 | /* Only check for thread_db if we loaded libpthread, |
1275 | or if this is the main symbol file. | |
1276 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1277 | a statically linked executable AND the symbol file is specified AFTER | |
1278 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1279 | For dynamically linked executables, libpthread can be near the end | |
1280 | of the list of shared libraries to load, and in an app of several | |
1281 | thousand shared libraries, this can otherwise be painful. */ | |
1282 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 1283 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 1284 | check_for_thread_db (); |
fb0e1ba7 MK |
1285 | } |
1286 | ||
015de688 DC |
1287 | static void |
1288 | check_pid_namespace_match (void) | |
1289 | { | |
1290 | /* Check is only relevant for local targets targets. */ | |
f6ac5f3d | 1291 | if (target_can_run ()) |
015de688 DC |
1292 | { |
1293 | /* If the child is in a different PID namespace, its idea of its | |
1294 | PID will differ from our idea of its PID. When we scan the | |
1295 | child's thread list, we'll mistakenly think it has no threads | |
1296 | since the thread PID fields won't match the PID we give to | |
1297 | libthread_db. */ | |
e99b03dc | 1298 | if (!linux_ns_same (inferior_ptid.pid (), LINUX_NS_PID)) |
015de688 DC |
1299 | { |
1300 | warning (_ ("Target and debugger are in different PID " | |
1301 | "namespaces; thread lists and other data are " | |
708bf0a1 JK |
1302 | "likely unreliable. " |
1303 | "Connect to gdbserver inside the container.")); | |
015de688 | 1304 | } |
015de688 DC |
1305 | } |
1306 | } | |
1307 | ||
0838fb57 DE |
1308 | /* This function is called via the inferior_created observer. |
1309 | This handles the case of debugging statically linked executables. */ | |
1310 | ||
1311 | static void | |
1312 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1313 | { | |
015de688 | 1314 | check_pid_namespace_match (); |
0838fb57 DE |
1315 | check_for_thread_db (); |
1316 | } | |
1317 | ||
c1a747c1 PA |
1318 | /* Update the thread's state (what's displayed in "info threads"), |
1319 | from libthread_db thread state information. */ | |
1320 | ||
1321 | static void | |
7aabaf9d | 1322 | update_thread_state (thread_db_thread_info *priv, |
c1a747c1 PA |
1323 | const td_thrinfo_t *ti_p) |
1324 | { | |
fe978cb0 PA |
1325 | priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN |
1326 | || ti_p->ti_state == TD_THR_ZOMBIE); | |
c1a747c1 PA |
1327 | } |
1328 | ||
2db9a427 | 1329 | /* Record a new thread in GDB's thread list. Creates the thread's |
be550b6e DE |
1330 | private info. If TP is NULL or TP is marked as having exited, |
1331 | creates a new thread. Otherwise, uses TP. */ | |
2db9a427 | 1332 | |
be550b6e | 1333 | static struct thread_info * |
2db9a427 PA |
1334 | record_thread (struct thread_db_info *info, |
1335 | struct thread_info *tp, | |
1336 | ptid_t ptid, const td_thrhandle_t *th_p, | |
1337 | const td_thrinfo_t *ti_p) | |
1338 | { | |
2db9a427 PA |
1339 | /* A thread ID of zero may mean the thread library has not |
1340 | initialized yet. Leave private == NULL until the thread library | |
1341 | has initialized. */ | |
1342 | if (ti_p->ti_tid == 0) | |
be550b6e | 1343 | return tp; |
2db9a427 | 1344 | |
17faa917 | 1345 | /* Construct the thread's private data. */ |
7aabaf9d | 1346 | thread_db_thread_info *priv = new thread_db_thread_info; |
17faa917 | 1347 | |
fe978cb0 PA |
1348 | priv->th = *th_p; |
1349 | priv->tid = ti_p->ti_tid; | |
1350 | update_thread_state (priv, ti_p); | |
17faa917 | 1351 | |
4eec2deb PA |
1352 | /* Add the thread to GDB's thread list. If we already know about a |
1353 | thread with this PTID, but it's marked exited, then the kernel | |
1354 | reused the tid of an old thread. */ | |
1355 | if (tp == NULL || tp->state == THREAD_EXITED) | |
5b6d1e4f | 1356 | tp = add_thread_with_info (info->process_target, ptid, priv); |
17faa917 | 1357 | else |
7aabaf9d | 1358 | tp->priv.reset (priv); |
5365276c | 1359 | |
2db9a427 PA |
1360 | if (target_has_execution) |
1361 | check_thread_signals (); | |
be550b6e DE |
1362 | |
1363 | return tp; | |
fb0e1ba7 MK |
1364 | } |
1365 | ||
f6ac5f3d PA |
1366 | void |
1367 | thread_db_target::detach (inferior *inf, int from_tty) | |
fb0e1ba7 | 1368 | { |
5b6d1e4f | 1369 | delete_thread_db_info (inf->process_target (), inf->pid); |
4105de34 | 1370 | |
d6ca69cd | 1371 | beneath ()->detach (inf, from_tty); |
d90e17a7 PA |
1372 | |
1373 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1374 | ||
5b6d1e4f PA |
1375 | /* Detach the thread_db target from this inferior. */ |
1376 | unpush_target (this); | |
fb0e1ba7 MK |
1377 | } |
1378 | ||
f6ac5f3d PA |
1379 | ptid_t |
1380 | thread_db_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
1381 | int options) | |
fb0e1ba7 | 1382 | { |
d90e17a7 | 1383 | struct thread_db_info *info; |
117de6a9 | 1384 | |
5b6d1e4f PA |
1385 | process_stratum_target *beneath |
1386 | = as_process_stratum_target (this->beneath ()); | |
1387 | ||
1388 | ptid = beneath->wait (ptid, ourstatus, options); | |
fb0e1ba7 | 1389 | |
aa01bd36 PA |
1390 | switch (ourstatus->kind) |
1391 | { | |
1392 | case TARGET_WAITKIND_IGNORE: | |
1393 | case TARGET_WAITKIND_EXITED: | |
1394 | case TARGET_WAITKIND_THREAD_EXITED: | |
1395 | case TARGET_WAITKIND_SIGNALLED: | |
1396 | return ptid; | |
1397 | } | |
fb0e1ba7 | 1398 | |
5b6d1e4f | 1399 | info = get_thread_db_info (beneath, ptid.pid ()); |
d90e17a7 PA |
1400 | |
1401 | /* If this process isn't using thread_db, we're done. */ | |
1402 | if (info == NULL) | |
1403 | return ptid; | |
1404 | ||
3f64f7b1 DJ |
1405 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1406 | { | |
d90e17a7 PA |
1407 | /* New image, it may or may not end up using thread_db. Assume |
1408 | not unless we find otherwise. */ | |
5b6d1e4f PA |
1409 | delete_thread_db_info (beneath, ptid.pid ()); |
1410 | unpush_target (this); | |
3f64f7b1 | 1411 | |
49fd4a42 | 1412 | return ptid; |
3f64f7b1 DJ |
1413 | } |
1414 | ||
2db9a427 | 1415 | /* Fill in the thread's user-level thread id and status. */ |
5b6d1e4f | 1416 | thread_from_lwp (find_thread_ptid (beneath, ptid), ptid); |
fb0e1ba7 | 1417 | |
b9b5d7ea | 1418 | return ptid; |
fb0e1ba7 MK |
1419 | } |
1420 | ||
f6ac5f3d PA |
1421 | void |
1422 | thread_db_target::mourn_inferior () | |
fb0e1ba7 | 1423 | { |
5b6d1e4f PA |
1424 | process_stratum_target *target_beneath |
1425 | = as_process_stratum_target (this->beneath ()); | |
1426 | ||
1427 | delete_thread_db_info (target_beneath, inferior_ptid.pid ()); | |
fb0e1ba7 | 1428 | |
5b6d1e4f | 1429 | target_beneath->mourn_inferior (); |
d90e17a7 | 1430 | |
5b6d1e4f PA |
1431 | /* Detach the thread_db target from this inferior. */ |
1432 | unpush_target (this); | |
fb0e1ba7 MK |
1433 | } |
1434 | ||
02c6c942 PP |
1435 | struct callback_data |
1436 | { | |
1437 | struct thread_db_info *info; | |
1438 | int new_threads; | |
1439 | }; | |
1440 | ||
fb0e1ba7 MK |
1441 | static int |
1442 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1443 | { | |
1444 | td_thrinfo_t ti; | |
1445 | td_err_e err; | |
403fe197 | 1446 | struct thread_info *tp; |
9a3c8263 | 1447 | struct callback_data *cb_data = (struct callback_data *) data; |
02c6c942 | 1448 | struct thread_db_info *info = cb_data->info; |
fb0e1ba7 | 1449 | |
d90e17a7 | 1450 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1451 | if (err != TD_OK) |
8a3fe4f8 | 1452 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1453 | thread_db_err_str (err)); |
fb0e1ba7 | 1454 | |
a33e3959 PA |
1455 | if (ti.ti_lid == -1) |
1456 | { | |
1457 | /* A thread with kernel thread ID -1 is either a thread that | |
1458 | exited and was joined, or a thread that is being created but | |
1459 | hasn't started yet, and that is reusing the tcb/stack of a | |
1460 | thread that previously exited and was joined. (glibc marks | |
1461 | terminated and joined threads with kernel thread ID -1. See | |
1462 | glibc PR17707. */ | |
d6c146e9 PA |
1463 | if (libthread_db_debug) |
1464 | fprintf_unfiltered (gdb_stdlog, | |
1465 | "thread_db: skipping exited and " | |
d41401ac DE |
1466 | "joined thread (0x%lx)\n", |
1467 | (unsigned long) ti.ti_tid); | |
a33e3959 PA |
1468 | return 0; |
1469 | } | |
1470 | ||
254f582e | 1471 | if (ti.ti_tid == 0) |
4105de34 DJ |
1472 | { |
1473 | /* A thread ID of zero means that this is the main thread, but | |
1474 | glibc has not yet initialized thread-local storage and the | |
1475 | pthread library. We do not know what the thread's TID will | |
c2c2a31f | 1476 | be yet. */ |
4105de34 | 1477 | |
4d062f1a PA |
1478 | /* In that case, we're not stopped in a fork syscall and don't |
1479 | need this glibc bug workaround. */ | |
1480 | info->need_stale_parent_threads_check = 0; | |
1481 | ||
4105de34 DJ |
1482 | return 0; |
1483 | } | |
1484 | ||
4d062f1a PA |
1485 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1486 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1487 | avoid doing the work if we know we don't have to. */ | |
1488 | if (info->need_stale_parent_threads_check) | |
1489 | { | |
1490 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1491 | |
4d062f1a PA |
1492 | if (tgid != -1 && tgid != info->pid) |
1493 | return 0; | |
1494 | } | |
1495 | ||
00431a78 | 1496 | ptid_t ptid (info->pid, ti.ti_lid); |
5b6d1e4f | 1497 | tp = find_thread_ptid (info->process_target, ptid); |
fe978cb0 | 1498 | if (tp == NULL || tp->priv == NULL) |
60269a4a | 1499 | record_thread (info, tp, ptid, th_p, &ti); |
fb0e1ba7 MK |
1500 | |
1501 | return 0; | |
1502 | } | |
1503 | ||
02c6c942 PP |
1504 | /* Helper for thread_db_find_new_threads_2. |
1505 | Returns number of new threads found. */ | |
1506 | ||
1507 | static int | |
1508 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1509 | td_err_e *errp) |
02c6c942 | 1510 | { |
02c6c942 | 1511 | struct callback_data data; |
fb169834 | 1512 | td_err_e err = TD_ERR; |
02c6c942 PP |
1513 | |
1514 | data.info = info; | |
1515 | data.new_threads = 0; | |
1516 | ||
2db9a427 | 1517 | /* See comment in thread_db_update_thread_list. */ |
1eb2dbb8 | 1518 | gdb_assert (info->td_ta_thr_iter_p != NULL); |
2db9a427 | 1519 | |
a70b8144 | 1520 | try |
02c6c942 PP |
1521 | { |
1522 | /* Iterate over all user-space threads to discover new threads. */ | |
1523 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1524 | find_new_threads_callback, | |
1525 | &data, | |
1526 | TD_THR_ANY_STATE, | |
1527 | TD_THR_LOWEST_PRIORITY, | |
1528 | TD_SIGNO_MASK, | |
1529 | TD_THR_ANY_USER_FLAGS); | |
1530 | } | |
230d2906 | 1531 | catch (const gdb_exception_error &except) |
02c6c942 | 1532 | { |
6c63c96a | 1533 | if (libthread_db_debug) |
492d29ea PA |
1534 | { |
1535 | exception_fprintf (gdb_stdlog, except, | |
1536 | "Warning: find_new_threads_once: "); | |
1537 | } | |
6c63c96a | 1538 | } |
02c6c942 | 1539 | |
6c63c96a PA |
1540 | if (libthread_db_debug) |
1541 | { | |
883ed13e PA |
1542 | fprintf_unfiltered (gdb_stdlog, |
1543 | _("Found %d new threads in iteration %d.\n"), | |
1544 | data.new_threads, iteration); | |
02c6c942 PP |
1545 | } |
1546 | ||
1547 | if (errp != NULL) | |
1548 | *errp = err; | |
1549 | ||
1550 | return data.new_threads; | |
1551 | } | |
1552 | ||
4c28f408 | 1553 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1554 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1555 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1556 | |
fb0e1ba7 | 1557 | static void |
00431a78 | 1558 | thread_db_find_new_threads_2 (thread_info *stopped, bool until_no_new) |
fb0e1ba7 | 1559 | { |
fcb44371 | 1560 | td_err_e err = TD_OK; |
d90e17a7 | 1561 | struct thread_db_info *info; |
02c6c942 | 1562 | int i, loop; |
4c28f408 | 1563 | |
5b6d1e4f PA |
1564 | info = get_thread_db_info (stopped->inf->process_target (), |
1565 | stopped->ptid.pid ()); | |
d90e17a7 | 1566 | |
4c28f408 | 1567 | /* Access an lwp we know is stopped. */ |
00431a78 | 1568 | info->proc_handle.thread = stopped; |
02c6c942 PP |
1569 | |
1570 | if (until_no_new) | |
1571 | { | |
1572 | /* Require 4 successive iterations which do not find any new threads. | |
1573 | The 4 is a heuristic: there is an inherent race here, and I have | |
1574 | seen that 2 iterations in a row are not always sufficient to | |
1575 | "capture" all threads. */ | |
fcb44371 JK |
1576 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1577 | if (find_new_threads_once (info, i, &err) != 0) | |
1578 | { | |
1579 | /* Found some new threads. Restart the loop from beginning. */ | |
1580 | loop = -1; | |
1581 | } | |
02c6c942 PP |
1582 | } |
1583 | else | |
fcb44371 JK |
1584 | find_new_threads_once (info, 0, &err); |
1585 | ||
1586 | if (err != TD_OK) | |
1587 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1588 | } |
1589 | ||
02c6c942 | 1590 | static void |
00431a78 | 1591 | thread_db_find_new_threads_1 (thread_info *stopped) |
02c6c942 | 1592 | { |
00431a78 | 1593 | thread_db_find_new_threads_2 (stopped, 0); |
02c6c942 PP |
1594 | } |
1595 | ||
a6904d5a PA |
1596 | /* Implement the to_update_thread_list target method for this |
1597 | target. */ | |
2db9a427 | 1598 | |
f6ac5f3d PA |
1599 | void |
1600 | thread_db_target::update_thread_list () | |
28439f5e | 1601 | { |
d90e17a7 PA |
1602 | struct thread_db_info *info; |
1603 | ||
e8032dde PA |
1604 | prune_threads (); |
1605 | ||
08036331 | 1606 | for (inferior *inf : all_inferiors ()) |
c65b3e0d | 1607 | { |
c65b3e0d PA |
1608 | if (inf->pid == 0) |
1609 | continue; | |
d90e17a7 | 1610 | |
5b6d1e4f | 1611 | info = get_thread_db_info (inf->process_target (), inf->pid); |
c65b3e0d PA |
1612 | if (info == NULL) |
1613 | continue; | |
1614 | ||
5b6d1e4f | 1615 | thread_info *thread = any_live_thread_of_inferior (inf); |
c65b3e0d PA |
1616 | if (thread == NULL || thread->executing) |
1617 | continue; | |
1618 | ||
a6904d5a PA |
1619 | /* It's best to avoid td_ta_thr_iter if possible. That walks |
1620 | data structures in the inferior's address space that may be | |
1621 | corrupted, or, if the target is running, the list may change | |
1622 | while we walk it. In the latter case, it's possible that a | |
1623 | thread exits just at the exact time that causes GDB to get | |
1624 | stuck in an infinite loop. To avoid pausing all threads | |
1625 | whenever the core wants to refresh the thread list, we | |
1626 | instead use thread_from_lwp immediately when we see an LWP | |
1627 | stop. That uses thread_db entry points that do not walk | |
1628 | libpthread's thread list, so should be safe, as well as more | |
1629 | efficient. */ | |
5018ce90 | 1630 | if (thread->inf->has_execution ()) |
a6904d5a PA |
1631 | continue; |
1632 | ||
00431a78 | 1633 | thread_db_find_new_threads_1 (thread); |
c65b3e0d | 1634 | } |
2db9a427 | 1635 | |
a6904d5a | 1636 | /* Give the beneath target a chance to do extra processing. */ |
b6a8c27b | 1637 | this->beneath ()->update_thread_list (); |
28439f5e PA |
1638 | } |
1639 | ||
a068643d | 1640 | std::string |
f6ac5f3d | 1641 | thread_db_target::pid_to_str (ptid_t ptid) |
fb0e1ba7 | 1642 | { |
5b6d1e4f | 1643 | thread_info *thread_info = find_thread_ptid (current_inferior (), ptid); |
17faa917 | 1644 | |
fe978cb0 | 1645 | if (thread_info != NULL && thread_info->priv != NULL) |
fb0e1ba7 | 1646 | { |
7aabaf9d | 1647 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
fb0e1ba7 | 1648 | |
a068643d TT |
1649 | return string_printf ("Thread 0x%lx (LWP %ld)", |
1650 | (unsigned long) priv->tid, ptid.lwp ()); | |
fb0e1ba7 MK |
1651 | } |
1652 | ||
d6ca69cd | 1653 | return beneath ()->pid_to_str (ptid); |
fb0e1ba7 MK |
1654 | } |
1655 | ||
28b17333 DJ |
1656 | /* Return a string describing the state of the thread specified by |
1657 | INFO. */ | |
1658 | ||
f6ac5f3d PA |
1659 | const char * |
1660 | thread_db_target::extra_thread_info (thread_info *info) | |
28b17333 | 1661 | { |
fe978cb0 | 1662 | if (info->priv == NULL) |
17faa917 DJ |
1663 | return NULL; |
1664 | ||
7aabaf9d SM |
1665 | thread_db_thread_info *priv = get_thread_db_thread_info (info); |
1666 | ||
1667 | if (priv->dying) | |
28b17333 DJ |
1668 | return "Exiting"; |
1669 | ||
1670 | return NULL; | |
1671 | } | |
1672 | ||
e04ee09e KB |
1673 | /* Return pointer to the thread_info struct which corresponds to |
1674 | THREAD_HANDLE (having length HANDLE_LEN). */ | |
1675 | ||
f6ac5f3d PA |
1676 | thread_info * |
1677 | thread_db_target::thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
1678 | int handle_len, | |
1679 | inferior *inf) | |
e04ee09e | 1680 | { |
e04ee09e KB |
1681 | thread_t handle_tid; |
1682 | ||
6bdfee81 KB |
1683 | /* When debugging a 32-bit target from a 64-bit host, handle_len |
1684 | will be 4 and sizeof (handle_tid) will be 8. This requires | |
1685 | a different cast than the more straightforward case where | |
1686 | the sizes are the same. | |
1687 | ||
1688 | Use "--target_board unix/-m32" from a native x86_64 linux build | |
1689 | to test the 32/64-bit case. */ | |
1690 | if (handle_len == 4 && sizeof (handle_tid) == 8) | |
1691 | handle_tid = (thread_t) * (const uint32_t *) thread_handle; | |
1692 | else if (handle_len == sizeof (handle_tid)) | |
1693 | handle_tid = * (const thread_t *) thread_handle; | |
1694 | else | |
e04ee09e KB |
1695 | error (_("Thread handle size mismatch: %d vs %zu (from libthread_db)"), |
1696 | handle_len, sizeof (handle_tid)); | |
1697 | ||
08036331 | 1698 | for (thread_info *tp : inf->non_exited_threads ()) |
e04ee09e | 1699 | { |
7aabaf9d SM |
1700 | thread_db_thread_info *priv = get_thread_db_thread_info (tp); |
1701 | ||
08036331 | 1702 | if (priv != NULL && handle_tid == priv->tid) |
e04ee09e KB |
1703 | return tp; |
1704 | } | |
1705 | ||
1706 | return NULL; | |
1707 | } | |
3d6c6204 KB |
1708 | |
1709 | /* Return the thread handle associated the thread_info pointer TP. */ | |
1710 | ||
1711 | gdb::byte_vector | |
1712 | thread_db_target::thread_info_to_thread_handle (struct thread_info *tp) | |
1713 | { | |
1714 | thread_db_thread_info *priv = get_thread_db_thread_info (tp); | |
1715 | ||
1716 | if (priv == NULL) | |
1717 | return gdb::byte_vector (); | |
1718 | ||
1719 | int handle_size = sizeof (priv->tid); | |
1720 | gdb::byte_vector rv (handle_size); | |
1721 | ||
1722 | memcpy (rv.data (), &priv->tid, handle_size); | |
1723 | ||
1724 | return rv; | |
1725 | } | |
e04ee09e | 1726 | |
b2756930 KB |
1727 | /* Get the address of the thread local variable in load module LM which |
1728 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c | 1729 | |
f6ac5f3d PA |
1730 | CORE_ADDR |
1731 | thread_db_target::get_thread_local_address (ptid_t ptid, | |
1732 | CORE_ADDR lm, | |
1733 | CORE_ADDR offset) | |
3f47be5c | 1734 | { |
17faa917 | 1735 | struct thread_info *thread_info; |
5b6d1e4f PA |
1736 | process_stratum_target *beneath |
1737 | = as_process_stratum_target (this->beneath ()); | |
17faa917 | 1738 | /* Find the matching thread. */ |
5b6d1e4f | 1739 | thread_info = find_thread_ptid (beneath, ptid); |
4105de34 | 1740 | |
e0fd7c47 UW |
1741 | /* We may not have discovered the thread yet. */ |
1742 | if (thread_info != NULL && thread_info->priv == NULL) | |
00431a78 | 1743 | thread_info = thread_from_lwp (thread_info, ptid); |
e0fd7c47 | 1744 | |
fe978cb0 | 1745 | if (thread_info != NULL && thread_info->priv != NULL) |
3f47be5c | 1746 | { |
3f47be5c | 1747 | td_err_e err; |
00f515da | 1748 | psaddr_t address; |
5b6d1e4f | 1749 | thread_db_info *info = get_thread_db_info (beneath, ptid.pid ()); |
7aabaf9d | 1750 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
3f47be5c | 1751 | |
3f47be5c | 1752 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1753 | if (lm != 0) |
1754 | { | |
1755 | /* glibc doesn't provide the needed interface. */ | |
1756 | if (!info->td_thr_tls_get_addr_p) | |
1757 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1758 | _("No TLS library support")); | |
1759 | ||
1760 | /* Note the cast through uintptr_t: this interface only works if | |
1761 | a target address fits in a psaddr_t, which is a host pointer. | |
1762 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
7aabaf9d | 1763 | err = info->td_thr_tls_get_addr_p (&priv->th, |
5876f503 JK |
1764 | (psaddr_t)(uintptr_t) lm, |
1765 | offset, &address); | |
1766 | } | |
1767 | else | |
1768 | { | |
1769 | /* If glibc doesn't provide the needed interface throw an error | |
1770 | that LM is zero - normally cases it should not be. */ | |
1771 | if (!info->td_thr_tlsbase_p) | |
1772 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1773 | _("TLS load module not found")); | |
1774 | ||
1775 | /* This code path handles the case of -static -pthread executables: | |
1776 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1777 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1778 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1779 | The constant number 1 depends on GNU __libc_setup_tls | |
1780 | initialization of l_tls_modid to 1. */ | |
7aabaf9d | 1781 | err = info->td_thr_tlsbase_p (&priv->th, 1, &address); |
5876f503 JK |
1782 | address = (char *) address + offset; |
1783 | } | |
3f47be5c EZ |
1784 | |
1785 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1786 | /* The memory hasn't been allocated, yet. */ | |
1787 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1788 | /* Now, if libthread_db provided the initialization image's |
1789 | address, we *could* try to build a non-lvalue value from | |
1790 | the initialization image. */ | |
109c3e39 AC |
1791 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1792 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1793 | #endif |
1794 | ||
1795 | /* Something else went wrong. */ | |
1796 | if (err != TD_OK) | |
109c3e39 AC |
1797 | throw_error (TLS_GENERIC_ERROR, |
1798 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1799 | |
1800 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1801 | /* Do proper sign extension for the target. */ |
1802 | gdb_assert (exec_bfd); | |
1803 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1804 | ? (CORE_ADDR) (intptr_t) address | |
1805 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1806 | } |
1807 | ||
5b6d1e4f | 1808 | return beneath->get_thread_local_address (ptid, lm, offset); |
3f47be5c EZ |
1809 | } |
1810 | ||
0ef643c8 JB |
1811 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
1812 | ||
f6ac5f3d PA |
1813 | ptid_t |
1814 | thread_db_target::get_ada_task_ptid (long lwp, long thread) | |
0ef643c8 | 1815 | { |
2db9a427 | 1816 | /* NPTL uses a 1:1 model, so the LWP id suffices. */ |
e99b03dc | 1817 | return ptid_t (inferior_ptid.pid (), lwp, 0); |
0ef643c8 JB |
1818 | } |
1819 | ||
f6ac5f3d PA |
1820 | void |
1821 | thread_db_target::resume (ptid_t ptid, int step, enum gdb_signal signo) | |
4d062f1a | 1822 | { |
5b6d1e4f PA |
1823 | process_stratum_target *beneath |
1824 | = as_process_stratum_target (this->beneath ()); | |
4d062f1a | 1825 | |
5b6d1e4f PA |
1826 | thread_db_info *info |
1827 | = get_thread_db_info (beneath, (ptid == minus_one_ptid | |
1828 | ? inferior_ptid.pid () | |
1829 | : ptid.pid ())); | |
4d062f1a PA |
1830 | |
1831 | /* This workaround is only needed for child fork lwps stopped in a | |
1832 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1833 | workaround can be disabled. */ | |
1834 | if (info) | |
1835 | info->need_stale_parent_threads_check = 0; | |
1836 | ||
5b6d1e4f | 1837 | beneath->resume (ptid, step, signo); |
4d062f1a PA |
1838 | } |
1839 | ||
9b292f68 | 1840 | /* std::sort helper function for info_auto_load_libthread_db, sort the |
bf88dd68 JK |
1841 | thread_db_info pointers primarily by their FILENAME and secondarily by their |
1842 | PID, both in ascending order. */ | |
1843 | ||
9b292f68 TT |
1844 | static bool |
1845 | info_auto_load_libthread_db_compare (const struct thread_db_info *a, | |
1846 | const struct thread_db_info *b) | |
bf88dd68 | 1847 | { |
bf88dd68 JK |
1848 | int retval; |
1849 | ||
1850 | retval = strcmp (a->filename, b->filename); | |
1851 | if (retval) | |
9b292f68 | 1852 | return retval < 0; |
bf88dd68 | 1853 | |
9b292f68 | 1854 | return a->pid < b->pid; |
bf88dd68 JK |
1855 | } |
1856 | ||
1857 | /* Implement 'info auto-load libthread-db'. */ | |
1858 | ||
1859 | static void | |
5fed81ff | 1860 | info_auto_load_libthread_db (const char *args, int from_tty) |
bf88dd68 JK |
1861 | { |
1862 | struct ui_out *uiout = current_uiout; | |
1863 | const char *cs = args ? args : ""; | |
9b292f68 TT |
1864 | struct thread_db_info *info; |
1865 | unsigned unique_filenames; | |
1866 | size_t max_filename_len, pids_len; | |
bf88dd68 JK |
1867 | int i; |
1868 | ||
f1735a53 | 1869 | cs = skip_spaces (cs); |
bf88dd68 JK |
1870 | if (*cs) |
1871 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1872 | ||
9b292f68 | 1873 | std::vector<struct thread_db_info *> array; |
bf88dd68 JK |
1874 | for (info = thread_db_list; info; info = info->next) |
1875 | if (info->filename != NULL) | |
9b292f68 | 1876 | array.push_back (info); |
bf88dd68 JK |
1877 | |
1878 | /* Sort ARRAY by filenames and PIDs. */ | |
9b292f68 TT |
1879 | std::sort (array.begin (), array.end (), |
1880 | info_auto_load_libthread_db_compare); | |
bf88dd68 JK |
1881 | |
1882 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1883 | length of PIDs list for the unique filenames (columns). */ | |
1884 | ||
1885 | unique_filenames = 0; | |
1886 | max_filename_len = 0; | |
bf88dd68 | 1887 | pids_len = 0; |
9b292f68 | 1888 | for (i = 0; i < array.size (); i++) |
bf88dd68 JK |
1889 | { |
1890 | int pid = array[i]->pid; | |
1891 | size_t this_pid_len; | |
1892 | ||
1893 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1894 | this_pid_len++; | |
1895 | ||
1896 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1897 | { | |
1898 | unique_filenames++; | |
325fac50 PA |
1899 | max_filename_len = std::max (max_filename_len, |
1900 | strlen (array[i]->filename)); | |
bf88dd68 JK |
1901 | |
1902 | if (i > 0) | |
9b292f68 | 1903 | pids_len -= strlen (", "); |
bf88dd68 JK |
1904 | pids_len = 0; |
1905 | } | |
1906 | pids_len += this_pid_len + strlen (", "); | |
1907 | } | |
1908 | if (i) | |
9b292f68 | 1909 | pids_len -= strlen (", "); |
bf88dd68 JK |
1910 | |
1911 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1912 | its columns. */ | |
9b292f68 | 1913 | if (array.size () > 0 && args == auto_load_info_scripts_pattern_nl) |
112e8700 | 1914 | uiout->text ("\n"); |
bf88dd68 | 1915 | |
4a2b031d TT |
1916 | { |
1917 | ui_out_emit_table table_emitter (uiout, 2, unique_filenames, | |
1918 | "LinuxThreadDbTable"); | |
bf88dd68 | 1919 | |
4a2b031d TT |
1920 | uiout->table_header (max_filename_len, ui_left, "filename", "Filename"); |
1921 | uiout->table_header (pids_len, ui_left, "PIDs", "Pids"); | |
1922 | uiout->table_body (); | |
bf88dd68 | 1923 | |
4a2b031d | 1924 | /* Note I is incremented inside the cycle, not at its end. */ |
9b292f68 | 1925 | for (i = 0; i < array.size ();) |
4a2b031d TT |
1926 | { |
1927 | ui_out_emit_tuple tuple_emitter (uiout, NULL); | |
bf88dd68 | 1928 | |
4a2b031d TT |
1929 | info = array[i]; |
1930 | uiout->field_string ("filename", info->filename); | |
bf88dd68 | 1931 | |
9b292f68 TT |
1932 | std::string pids; |
1933 | while (i < array.size () && strcmp (info->filename, | |
1934 | array[i]->filename) == 0) | |
4a2b031d | 1935 | { |
9b292f68 TT |
1936 | if (!pids.empty ()) |
1937 | pids += ", "; | |
1938 | string_appendf (pids, "%u", array[i]->pid); | |
4a2b031d TT |
1939 | i++; |
1940 | } | |
bf88dd68 | 1941 | |
9b292f68 | 1942 | uiout->field_string ("pids", pids.c_str ()); |
bf88dd68 | 1943 | |
4a2b031d TT |
1944 | uiout->text ("\n"); |
1945 | } | |
1946 | } | |
bf88dd68 | 1947 | |
9b292f68 | 1948 | if (array.empty ()) |
112e8700 | 1949 | uiout->message (_("No auto-loaded libthread-db.\n")); |
bf88dd68 JK |
1950 | } |
1951 | ||
5045b3d7 GB |
1952 | /* Implement 'maintenance check libthread-db'. */ |
1953 | ||
1954 | static void | |
1955 | maintenance_check_libthread_db (const char *args, int from_tty) | |
1956 | { | |
e99b03dc | 1957 | int inferior_pid = inferior_ptid.pid (); |
5045b3d7 GB |
1958 | struct thread_db_info *info; |
1959 | ||
1960 | if (inferior_pid == 0) | |
1961 | error (_("No inferior running")); | |
1962 | ||
5b6d1e4f PA |
1963 | info = get_thread_db_info (current_inferior ()->process_target (), |
1964 | inferior_pid); | |
5045b3d7 GB |
1965 | if (info == NULL) |
1966 | error (_("No libthread_db loaded")); | |
1967 | ||
1968 | check_thread_db (info, true); | |
1969 | } | |
1970 | ||
6c265988 | 1971 | void _initialize_thread_db (); |
fb0e1ba7 | 1972 | void |
6c265988 | 1973 | _initialize_thread_db () |
fb0e1ba7 | 1974 | { |
17a37d48 PP |
1975 | /* Defer loading of libthread_db.so until inferior is running. |
1976 | This allows gdb to load correct libthread_db for a given | |
4a6ed09b PA |
1977 | executable -- there could be multiple versions of glibc, |
1978 | and until there is a running inferior, we can't tell which | |
1979 | libthread_db is the correct one to load. */ | |
17a37d48 PP |
1980 | |
1981 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1982 | ||
1983 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1984 | class_support, | |
1985 | &libthread_db_search_path, _("\ | |
1986 | Set search path for libthread_db."), _("\ | |
1987 | Show the current search path or libthread_db."), _("\ | |
1988 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
1989 | gdb itself.\n\ |
1990 | Its value is a colon (':') separate list of directories to search.\n\ | |
1991 | Setting the search path to an empty list resets it to its default value."), | |
1992 | set_libthread_db_search_path, | |
17a37d48 PP |
1993 | NULL, |
1994 | &setlist, &showlist); | |
02d868e8 | 1995 | |
ccce17b0 YQ |
1996 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
1997 | &libthread_db_debug, _("\ | |
02d868e8 PP |
1998 | Set libthread-db debugging."), _("\ |
1999 | Show libthread-db debugging."), _("\ | |
2000 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
2001 | NULL, |
2002 | show_libthread_db_debug, | |
2003 | &setdebuglist, &showdebuglist); | |
02d868e8 | 2004 | |
bf88dd68 JK |
2005 | add_setshow_boolean_cmd ("libthread-db", class_support, |
2006 | &auto_load_thread_db, _("\ | |
2007 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
2008 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
2009 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
2010 | locations to load libthread_db compatible with the inferior.\n\ | |
2011 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
8d8c087f | 2012 | This option has security implications for untrusted inferiors."), |
bf88dd68 JK |
2013 | NULL, show_auto_load_thread_db, |
2014 | auto_load_set_cmdlist_get (), | |
2015 | auto_load_show_cmdlist_get ()); | |
2016 | ||
2017 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
2018 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
2019 | Usage: info auto-load libthread-db"), | |
2020 | auto_load_info_cmdlist_get ()); | |
2021 | ||
5045b3d7 GB |
2022 | add_cmd ("libthread-db", class_maintenance, |
2023 | maintenance_check_libthread_db, _("\ | |
2024 | Run integrity checks on the current inferior's libthread_db."), | |
2025 | &maintenancechecklist); | |
2026 | ||
2027 | add_setshow_boolean_cmd ("check-libthread-db", | |
2028 | class_maintenance, | |
2029 | &check_thread_db_on_load, _("\ | |
2030 | Set whether to check libthread_db at load time."), _("\ | |
2031 | Show whether to check libthread_db at load time."), _("\ | |
2032 | If enabled GDB will run integrity checks on inferior specific libthread_db\n\ | |
2033 | as they are loaded."), | |
2034 | NULL, | |
2035 | NULL, | |
2036 | &maintenance_set_cmdlist, | |
2037 | &maintenance_show_cmdlist); | |
2038 | ||
17a37d48 | 2039 | /* Add ourselves to objfile event chain. */ |
76727919 | 2040 | gdb::observers::new_objfile.attach (thread_db_new_objfile); |
0838fb57 DE |
2041 | |
2042 | /* Add ourselves to inferior_created event chain. | |
2043 | This is needed to handle debugging statically linked programs where | |
2044 | the new_objfile observer won't get called for libpthread. */ | |
76727919 | 2045 | gdb::observers::inferior_created.attach (thread_db_inferior_created); |
fb0e1ba7 | 2046 | } |