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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
3666a048 | 3 | Copyright (C) 1999-2021 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 | 94 | void detach (inferior *, int) override; |
b60cea74 | 95 | ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override; |
f6ac5f3d PA |
96 | void resume (ptid_t, int, enum gdb_signal) override; |
97 | void mourn_inferior () override; | |
294c36eb | 98 | void follow_exec (inferior *, ptid_t, const char *) override; |
f6ac5f3d | 99 | void update_thread_list () override; |
a068643d | 100 | std::string pid_to_str (ptid_t) override; |
f6ac5f3d PA |
101 | CORE_ADDR get_thread_local_address (ptid_t ptid, |
102 | CORE_ADDR load_module_addr, | |
103 | CORE_ADDR offset) override; | |
104 | const char *extra_thread_info (struct thread_info *) override; | |
105 | ptid_t get_ada_task_ptid (long lwp, long thread) override; | |
106 | ||
107 | thread_info *thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
108 | int handle_len, | |
109 | inferior *inf) override; | |
3d6c6204 | 110 | gdb::byte_vector thread_info_to_thread_handle (struct thread_info *) override; |
f6ac5f3d PA |
111 | }; |
112 | ||
17a37d48 PP |
113 | static char *libthread_db_search_path; |
114 | ||
491144b5 | 115 | /* Set to true if thread_db auto-loading is enabled |
bf88dd68 | 116 | by the "set auto-load libthread-db" command. */ |
491144b5 | 117 | static bool auto_load_thread_db = true; |
bf88dd68 | 118 | |
491144b5 | 119 | /* Set to true if load-time libthread_db tests have been enabled |
85102364 | 120 | by the "maintenance set check-libthread-db" command. */ |
491144b5 | 121 | static bool check_thread_db_on_load = false; |
5045b3d7 | 122 | |
bf88dd68 JK |
123 | /* "show" command for the auto_load_thread_db configuration variable. */ |
124 | ||
125 | static void | |
126 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
127 | struct cmd_list_element *c, const char *value) | |
128 | { | |
129 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
130 | "is %s.\n"), | |
131 | value); | |
132 | } | |
133 | ||
84e578fb | 134 | static void |
eb4c3f4a | 135 | set_libthread_db_search_path (const char *ignored, int from_tty, |
84e578fb DE |
136 | struct cmd_list_element *c) |
137 | { | |
138 | if (*libthread_db_search_path == '\0') | |
139 | { | |
140 | xfree (libthread_db_search_path); | |
141 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
142 | } | |
143 | } | |
144 | ||
02d868e8 PP |
145 | /* If non-zero, print details of libthread_db processing. */ |
146 | ||
ccce17b0 | 147 | static unsigned int libthread_db_debug; |
02d868e8 PP |
148 | |
149 | static void | |
150 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
151 | struct cmd_list_element *c, const char *value) | |
152 | { | |
153 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
154 | } | |
155 | ||
8605d56e AC |
156 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
157 | threads. */ | |
fb0e1ba7 | 158 | |
fb0e1ba7 | 159 | /* This module's target vector. */ |
f6ac5f3d | 160 | static thread_db_target the_thread_db_target; |
fb0e1ba7 | 161 | |
fb0e1ba7 MK |
162 | /* Non-zero if we have determined the signals used by the threads |
163 | library. */ | |
164 | static int thread_signals; | |
fb0e1ba7 | 165 | |
d90e17a7 PA |
166 | struct thread_db_info |
167 | { | |
168 | struct thread_db_info *next; | |
169 | ||
5b6d1e4f PA |
170 | /* The target this thread_db_info is bound to. */ |
171 | process_stratum_target *process_target; | |
172 | ||
d90e17a7 PA |
173 | /* Process id this object refers to. */ |
174 | int pid; | |
175 | ||
176 | /* Handle from dlopen for libthread_db.so. */ | |
177 | void *handle; | |
178 | ||
bf88dd68 JK |
179 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
180 | HANDLE. It may be NULL for system library. */ | |
181 | char *filename; | |
182 | ||
d90e17a7 PA |
183 | /* Structure that identifies the child process for the |
184 | <proc_service.h> interface. */ | |
185 | struct ps_prochandle proc_handle; | |
186 | ||
187 | /* Connection to the libthread_db library. */ | |
188 | td_thragent_t *thread_agent; | |
189 | ||
4d062f1a PA |
190 | /* True if we need to apply the workaround for glibc/BZ5983. When |
191 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
192 | list, nptl_db returns the parent's threads in addition to the new | |
193 | (single) child thread. If this flag is set, we do extra work to | |
194 | be able to ignore such stale entries. */ | |
195 | int need_stale_parent_threads_check; | |
196 | ||
d90e17a7 | 197 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 198 | |
96e9210f PA |
199 | td_init_ftype *td_init_p; |
200 | td_ta_new_ftype *td_ta_new_p; | |
a2419b98 | 201 | td_ta_delete_ftype *td_ta_delete_p; |
96e9210f PA |
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. */ | |
6bd434d6 | 211 | static thread_db_info *thread_db_list; |
d90e17a7 | 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 | |
5b6d1e4f | 233 | info->process_target = current_inferior ()->process_target (); |
e99b03dc | 234 | info->pid = inferior_ptid.pid (); |
d90e17a7 | 235 | info->handle = handle; |
856d6f99 PA |
236 | |
237 | /* The workaround works by reading from /proc/pid/status, so it is | |
238 | disabled for core files. */ | |
55f6301a | 239 | if (target_has_execution ()) |
856d6f99 | 240 | info->need_stale_parent_threads_check = 1; |
d90e17a7 PA |
241 | |
242 | info->next = thread_db_list; | |
243 | thread_db_list = info; | |
244 | ||
245 | return info; | |
246 | } | |
247 | ||
248 | /* Return the thread_db_info object representing the bookkeeping | |
249 | related to process PID, if any; NULL otherwise. */ | |
250 | ||
251 | static struct thread_db_info * | |
5b6d1e4f | 252 | get_thread_db_info (process_stratum_target *targ, int pid) |
d90e17a7 PA |
253 | { |
254 | struct thread_db_info *info; | |
255 | ||
256 | for (info = thread_db_list; info; info = info->next) | |
5b6d1e4f | 257 | if (targ == info->process_target && pid == info->pid) |
d90e17a7 PA |
258 | return info; |
259 | ||
260 | return NULL; | |
261 | } | |
262 | ||
a2419b98 PW |
263 | static const char *thread_db_err_str (td_err_e err); |
264 | ||
d90e17a7 PA |
265 | /* When PID has exited or has been detached, we no longer want to keep |
266 | track of it as using libpthread. Call this function to discard | |
267 | thread_db related info related to PID. Note that this closes | |
268 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
269 | ||
270 | static void | |
5b6d1e4f | 271 | delete_thread_db_info (process_stratum_target *targ, int pid) |
d90e17a7 PA |
272 | { |
273 | struct thread_db_info *info, *info_prev; | |
274 | ||
275 | info_prev = NULL; | |
276 | ||
277 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
5b6d1e4f | 278 | if (targ == info->process_target && pid == info->pid) |
d90e17a7 PA |
279 | break; |
280 | ||
281 | if (info == NULL) | |
282 | return; | |
283 | ||
a2419b98 PW |
284 | if (info->thread_agent != NULL && info->td_ta_delete_p != NULL) |
285 | { | |
286 | td_err_e err = info->td_ta_delete_p (info->thread_agent); | |
287 | ||
288 | if (err != TD_OK) | |
289 | warning (_("Cannot deregister process %d from libthread_db: %s"), | |
290 | pid, thread_db_err_str (err)); | |
291 | info->thread_agent = NULL; | |
292 | } | |
293 | ||
d90e17a7 PA |
294 | if (info->handle != NULL) |
295 | dlclose (info->handle); | |
296 | ||
bf88dd68 JK |
297 | xfree (info->filename); |
298 | ||
d90e17a7 PA |
299 | if (info_prev) |
300 | info_prev->next = info->next; | |
301 | else | |
302 | thread_db_list = info->next; | |
303 | ||
304 | xfree (info); | |
305 | } | |
fb0e1ba7 | 306 | |
5365276c DJ |
307 | /* Use "struct private_thread_info" to cache thread state. This is |
308 | a substantial optimization. */ | |
309 | ||
7aabaf9d | 310 | struct thread_db_thread_info : public private_thread_info |
fb0e1ba7 | 311 | { |
a2f23071 | 312 | /* Flag set when we see a TD_DEATH event for this thread. */ |
7aabaf9d | 313 | bool dying = false; |
a2f23071 | 314 | |
5365276c | 315 | /* Cached thread state. */ |
7aabaf9d SM |
316 | td_thrhandle_t th {}; |
317 | thread_t tid {}; | |
fb0e1ba7 | 318 | }; |
7aabaf9d SM |
319 | |
320 | static thread_db_thread_info * | |
321 | get_thread_db_thread_info (thread_info *thread) | |
322 | { | |
323 | return static_cast<thread_db_thread_info *> (thread->priv.get ()); | |
324 | } | |
21bf60fe | 325 | |
a121b7c1 | 326 | static const char * |
fb0e1ba7 MK |
327 | thread_db_err_str (td_err_e err) |
328 | { | |
329 | static char buf[64]; | |
330 | ||
331 | switch (err) | |
332 | { | |
333 | case TD_OK: | |
334 | return "generic 'call succeeded'"; | |
335 | case TD_ERR: | |
336 | return "generic error"; | |
337 | case TD_NOTHR: | |
338 | return "no thread to satisfy query"; | |
339 | case TD_NOSV: | |
340 | return "no sync handle to satisfy query"; | |
341 | case TD_NOLWP: | |
342 | return "no LWP to satisfy query"; | |
343 | case TD_BADPH: | |
344 | return "invalid process handle"; | |
345 | case TD_BADTH: | |
346 | return "invalid thread handle"; | |
347 | case TD_BADSH: | |
348 | return "invalid synchronization handle"; | |
349 | case TD_BADTA: | |
350 | return "invalid thread agent"; | |
351 | case TD_BADKEY: | |
352 | return "invalid key"; | |
353 | case TD_NOMSG: | |
354 | return "no event message for getmsg"; | |
355 | case TD_NOFPREGS: | |
356 | return "FPU register set not available"; | |
357 | case TD_NOLIBTHREAD: | |
358 | return "application not linked with libthread"; | |
359 | case TD_NOEVENT: | |
360 | return "requested event is not supported"; | |
361 | case TD_NOCAPAB: | |
362 | return "capability not available"; | |
363 | case TD_DBERR: | |
364 | return "debugger service failed"; | |
365 | case TD_NOAPLIC: | |
366 | return "operation not applicable to"; | |
367 | case TD_NOTSD: | |
368 | return "no thread-specific data for this thread"; | |
369 | case TD_MALLOC: | |
370 | return "malloc failed"; | |
371 | case TD_PARTIALREG: | |
372 | return "only part of register set was written/read"; | |
373 | case TD_NOXREGS: | |
374 | return "X register set not available for this thread"; | |
59f80f10 DJ |
375 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
376 | case TD_NOTALLOC: | |
377 | return "thread has not yet allocated TLS for given module"; | |
378 | #endif | |
379 | #ifdef THREAD_DB_HAS_TD_VERSION | |
380 | case TD_VERSION: | |
381 | return "versions of libpthread and libthread_db do not match"; | |
382 | #endif | |
383 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
384 | case TD_NOTLS: | |
385 | return "there is no TLS segment in the given module"; | |
386 | #endif | |
fb0e1ba7 MK |
387 | default: |
388 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
389 | return buf; | |
390 | } | |
391 | } | |
4105de34 | 392 | |
00431a78 PA |
393 | /* Fetch the user-level thread id of PTID. STOPPED is a stopped |
394 | thread that we can use to access memory. */ | |
fb0e1ba7 | 395 | |
be550b6e | 396 | static struct thread_info * |
00431a78 | 397 | thread_from_lwp (thread_info *stopped, ptid_t ptid) |
fb0e1ba7 | 398 | { |
fb0e1ba7 | 399 | td_thrhandle_t th; |
2db9a427 | 400 | td_thrinfo_t ti; |
fb0e1ba7 | 401 | td_err_e err; |
d90e17a7 | 402 | struct thread_db_info *info; |
2db9a427 | 403 | struct thread_info *tp; |
fb0e1ba7 | 404 | |
6cb9b55b PP |
405 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
406 | th.th_unique = 0; | |
407 | ||
17faa917 DJ |
408 | /* This ptid comes from linux-nat.c, which should always fill in the |
409 | LWP. */ | |
e38504b3 | 410 | gdb_assert (ptid.lwp () != 0); |
fb0e1ba7 | 411 | |
5b6d1e4f | 412 | info = get_thread_db_info (stopped->inf->process_target (), ptid.pid ()); |
d90e17a7 | 413 | |
4c28f408 | 414 | /* Access an lwp we know is stopped. */ |
00431a78 | 415 | info->proc_handle.thread = stopped; |
e38504b3 | 416 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid.lwp (), |
dfd4cc63 | 417 | &th); |
fb0e1ba7 | 418 | if (err != TD_OK) |
8a3fe4f8 | 419 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
e38504b3 | 420 | ptid.lwp (), thread_db_err_str (err)); |
fb0e1ba7 | 421 | |
2db9a427 PA |
422 | err = info->td_thr_get_info_p (&th, &ti); |
423 | if (err != TD_OK) | |
424 | error (_("thread_get_info_callback: cannot get thread info: %s"), | |
425 | thread_db_err_str (err)); | |
426 | ||
427 | /* Fill the cache. */ | |
5b6d1e4f | 428 | tp = find_thread_ptid (stopped->inf->process_target (), ptid); |
be550b6e | 429 | return record_thread (info, tp, ptid, &th, &ti); |
fb0e1ba7 MK |
430 | } |
431 | \f | |
432 | ||
2db9a427 PA |
433 | /* See linux-nat.h. */ |
434 | ||
4c28f408 | 435 | int |
2db9a427 | 436 | thread_db_notice_clone (ptid_t parent, ptid_t child) |
4c28f408 | 437 | { |
d90e17a7 | 438 | struct thread_db_info *info; |
4c28f408 | 439 | |
5b6d1e4f | 440 | info = get_thread_db_info (linux_target, child.pid ()); |
d90e17a7 PA |
441 | |
442 | if (info == NULL) | |
4c28f408 PA |
443 | return 0; |
444 | ||
5b6d1e4f | 445 | thread_info *stopped = find_thread_ptid (linux_target, parent); |
4c28f408 | 446 | |
00431a78 PA |
447 | thread_from_lwp (stopped, child); |
448 | ||
449 | /* If we do not know about the main thread's pthread info yet, this | |
450 | would be a good time to find it. */ | |
451 | thread_from_lwp (stopped, parent); | |
4c28f408 PA |
452 | return 1; |
453 | } | |
454 | ||
5220ea4c AC |
455 | static void * |
456 | verbose_dlsym (void *handle, const char *name) | |
457 | { | |
458 | void *sym = dlsym (handle, name); | |
459 | if (sym == NULL) | |
3e43a32a MS |
460 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
461 | name, dlerror ()); | |
5220ea4c AC |
462 | return sym; |
463 | } | |
464 | ||
fcb44371 JK |
465 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
466 | return 1 if this version is lower (and not equal) to | |
467 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
468 | ||
469 | static int | |
470 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
471 | { | |
3b7344d5 | 472 | struct bound_minimal_symbol version_msym; |
fcb44371 | 473 | CORE_ADDR version_addr; |
66920317 | 474 | int got, retval = 0; |
fcb44371 JK |
475 | |
476 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 477 | if (version_msym.minsym == NULL) |
fcb44371 JK |
478 | return 0; |
479 | ||
77e371c0 | 480 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
66920317 TT |
481 | gdb::unique_xmalloc_ptr<char> version |
482 | = target_read_string (version_addr, 32, &got); | |
483 | if (version != nullptr | |
484 | && 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 | |
55f6301a | 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 | ||
55f6301a | 660 | if (tdb_testinfo->last_result == TD_ERR && !target_has_execution ()) |
5045b3d7 GB |
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 | 851 | else |
dda83cd7 SM |
852 | switch (err) |
853 | { | |
854 | case TD_NOLIBTHREAD: | |
17a37d48 | 855 | #ifdef THREAD_DB_HAS_TD_VERSION |
dda83cd7 | 856 | case TD_VERSION: |
17a37d48 | 857 | #endif |
dda83cd7 SM |
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. */ | |
55f6301a | 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 | |
dda83cd7 SM |
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 | 947 | for this process. */ |
02980c56 | 948 | current_inferior ()->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 | ||
a59902a7 SM |
978 | auto_load_debug_printf |
979 | ("Loading libthread-db library \"%s\" from explicit directory.", | |
980 | library); | |
981 | ||
982 | if (!file_is_auto_load_safe (library)) | |
9ddc1af1 | 983 | return false; |
fde4f8ed JK |
984 | } |
985 | ||
17a37d48 PP |
986 | handle = dlopen (library, RTLD_NOW); |
987 | if (handle == NULL) | |
988 | { | |
02d868e8 | 989 | if (libthread_db_debug) |
883ed13e | 990 | fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ()); |
9ddc1af1 | 991 | return false; |
17a37d48 PP |
992 | } |
993 | ||
02d868e8 | 994 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
995 | { |
996 | void *td_init; | |
997 | ||
998 | td_init = dlsym (handle, "td_init"); | |
999 | if (td_init != NULL) | |
dda83cd7 SM |
1000 | { |
1001 | const char *const libpath = dladdr_to_soname (td_init); | |
17a37d48 | 1002 | |
dda83cd7 SM |
1003 | if (libpath != NULL) |
1004 | fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"), | |
1005 | library, libpath); | |
1006 | } | |
17a37d48 PP |
1007 | } |
1008 | ||
d90e17a7 PA |
1009 | info = add_thread_db_info (handle); |
1010 | ||
bf88dd68 JK |
1011 | /* Do not save system library name, that one is always trusted. */ |
1012 | if (strchr (library, '/') != NULL) | |
14278e1f | 1013 | info->filename = gdb_realpath (library).release (); |
bf88dd68 | 1014 | |
d90e17a7 | 1015 | if (try_thread_db_load_1 (info)) |
9ddc1af1 | 1016 | return true; |
17a37d48 PP |
1017 | |
1018 | /* This library "refused" to work on current inferior. */ | |
5b6d1e4f PA |
1019 | delete_thread_db_info (current_inferior ()->process_target (), |
1020 | inferior_ptid.pid ()); | |
9ddc1af1 | 1021 | return false; |
17a37d48 PP |
1022 | } |
1023 | ||
290351b8 | 1024 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
1025 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
1026 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
1027 | The result is true for success. */ |
1028 | ||
9ddc1af1 | 1029 | static bool |
e6712ff1 | 1030 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 1031 | { |
4262abfb | 1032 | const char *obj_name = objfile_name (obj); |
290351b8 | 1033 | |
4262abfb | 1034 | if (obj_name[0] != '/') |
290351b8 DE |
1035 | { |
1036 | warning (_("Expected absolute pathname for libpthread in the" | |
9d636d67 TT |
1037 | " inferior, but got %ps."), |
1038 | styled_string (file_name_style.style (), obj_name)); | |
9ddc1af1 | 1039 | return false; |
290351b8 | 1040 | } |
05386e9e | 1041 | |
9b292f68 TT |
1042 | std::string path = obj_name; |
1043 | size_t cp = path.rfind ('/'); | |
05386e9e | 1044 | /* This should at minimum hit the first character. */ |
9b292f68 TT |
1045 | gdb_assert (cp != std::string::npos); |
1046 | path.resize (cp + 1); | |
e6712ff1 | 1047 | if (subdir != NULL) |
9b292f68 TT |
1048 | path = path + subdir + "/"; |
1049 | path += LIBTHREAD_DB_SO; | |
bccbefd2 | 1050 | |
9ddc1af1 | 1051 | return try_thread_db_load (path.c_str (), true); |
290351b8 DE |
1052 | } |
1053 | ||
98a5dd13 | 1054 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
1055 | Look for libthread_db in directory(libpthread)/SUBDIR. |
1056 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
1057 | The result is true for success. */ |
1058 | ||
9ddc1af1 | 1059 | static bool |
e6712ff1 | 1060 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 | 1061 | { |
bf88dd68 | 1062 | if (!auto_load_thread_db) |
9ddc1af1 | 1063 | return false; |
bf88dd68 | 1064 | |
2030c079 | 1065 | for (objfile *obj : current_program_space->objfiles ()) |
4262abfb | 1066 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 1067 | { |
e6712ff1 | 1068 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
9ddc1af1 | 1069 | return true; |
290351b8 DE |
1070 | |
1071 | /* We may have found the separate-debug-info version of | |
1072 | libpthread, and it may live in a directory without a matching | |
1073 | libthread_db. */ | |
1074 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
1075 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
1076 | subdir); | |
290351b8 | 1077 | |
9ddc1af1 | 1078 | return false; |
98a5dd13 DE |
1079 | } |
1080 | ||
9ddc1af1 | 1081 | return false; |
98a5dd13 DE |
1082 | } |
1083 | ||
1084 | /* Handle $sdir in libthread-db-search-path. | |
1085 | Look for libthread_db in the system dirs, or wherever a plain | |
1086 | dlopen(file_without_path) will look. | |
1087 | The result is true for success. */ | |
1088 | ||
9ddc1af1 | 1089 | static bool |
98a5dd13 DE |
1090 | try_thread_db_load_from_sdir (void) |
1091 | { | |
9ddc1af1 | 1092 | return try_thread_db_load (LIBTHREAD_DB_SO, false); |
98a5dd13 DE |
1093 | } |
1094 | ||
1095 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
1096 | The result is true for success. */ | |
1097 | ||
9ddc1af1 | 1098 | static bool |
98a5dd13 DE |
1099 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) |
1100 | { | |
bf88dd68 | 1101 | if (!auto_load_thread_db) |
9ddc1af1 | 1102 | return false; |
bf88dd68 | 1103 | |
9b292f68 | 1104 | std::string path = std::string (dir, dir_len) + "/" + LIBTHREAD_DB_SO; |
bccbefd2 | 1105 | |
9ddc1af1 | 1106 | return try_thread_db_load (path.c_str (), true); |
98a5dd13 DE |
1107 | } |
1108 | ||
17a37d48 | 1109 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
1110 | to work on current inferior. |
1111 | The result is true for success. */ | |
17a37d48 | 1112 | |
9ddc1af1 | 1113 | static bool |
17a37d48 PP |
1114 | thread_db_load_search (void) |
1115 | { | |
9ddc1af1 | 1116 | bool rc = false; |
17a37d48 | 1117 | |
e80aaf61 SM |
1118 | std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec |
1119 | = dirnames_to_char_ptr_vec (libthread_db_search_path); | |
e6712ff1 | 1120 | |
e80aaf61 | 1121 | for (const gdb::unique_xmalloc_ptr<char> &this_dir_up : dir_vec) |
17a37d48 | 1122 | { |
e80aaf61 | 1123 | const char *this_dir = this_dir_up.get (); |
e6712ff1 | 1124 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 1125 | size_t this_dir_len; |
e0881a8e | 1126 | |
e6712ff1 | 1127 | this_dir_len = strlen (this_dir); |
17a37d48 | 1128 | |
e6712ff1 DE |
1129 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
1130 | && (this_dir[pdir_len] == '\0' | |
1131 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 1132 | { |
9b292f68 | 1133 | const char *subdir = NULL; |
e6712ff1 | 1134 | |
9b292f68 | 1135 | std::string subdir_holder; |
e6712ff1 | 1136 | if (this_dir[pdir_len] == '/') |
98a5dd13 | 1137 | { |
9b292f68 TT |
1138 | subdir_holder = std::string (this_dir + pdir_len + 1); |
1139 | subdir = subdir_holder.c_str (); | |
98a5dd13 | 1140 | } |
e6712ff1 | 1141 | rc = try_thread_db_load_from_pdir (subdir); |
e6712ff1 DE |
1142 | if (rc) |
1143 | break; | |
17a37d48 | 1144 | } |
e6712ff1 | 1145 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
1146 | { |
1147 | if (try_thread_db_load_from_sdir ()) | |
1148 | { | |
1149 | rc = 1; | |
1150 | break; | |
1151 | } | |
1152 | } | |
1153 | else | |
17a37d48 | 1154 | { |
98a5dd13 DE |
1155 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
1156 | { | |
1157 | rc = 1; | |
1158 | break; | |
1159 | } | |
17a37d48 PP |
1160 | } |
1161 | } | |
98a5dd13 DE |
1162 | |
1163 | if (libthread_db_debug) | |
883ed13e PA |
1164 | fprintf_unfiltered (gdb_stdlog, |
1165 | _("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1166 | return rc; |
1167 | } | |
1168 | ||
9ddc1af1 | 1169 | /* Return true if the inferior has a libpthread. */ |
98a5dd13 | 1170 | |
9ddc1af1 | 1171 | static bool |
98a5dd13 DE |
1172 | has_libpthread (void) |
1173 | { | |
2030c079 | 1174 | for (objfile *obj : current_program_space->objfiles ()) |
4262abfb | 1175 | if (libpthread_name_p (objfile_name (obj))) |
9ddc1af1 | 1176 | return true; |
98a5dd13 | 1177 | |
9ddc1af1 | 1178 | return false; |
98a5dd13 DE |
1179 | } |
1180 | ||
17a37d48 | 1181 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1182 | Return 1 on success. */ |
17a37d48 | 1183 | |
9ddc1af1 | 1184 | static bool |
17a37d48 PP |
1185 | thread_db_load (void) |
1186 | { | |
d90e17a7 | 1187 | struct thread_db_info *info; |
17a37d48 | 1188 | |
5b6d1e4f PA |
1189 | info = get_thread_db_info (current_inferior ()->process_target (), |
1190 | inferior_ptid.pid ()); | |
d90e17a7 PA |
1191 | |
1192 | if (info != NULL) | |
9ddc1af1 | 1193 | return true; |
17a37d48 | 1194 | |
856d6f99 PA |
1195 | /* Don't attempt to use thread_db on executables not running |
1196 | yet. */ | |
9dccd06e | 1197 | if (!target_has_registers ()) |
9ddc1af1 | 1198 | return false; |
17a37d48 PP |
1199 | |
1200 | /* Don't attempt to use thread_db for remote targets. */ | |
f6ac5f3d | 1201 | if (!(target_can_run () || core_bfd)) |
9ddc1af1 | 1202 | return false; |
17a37d48 PP |
1203 | |
1204 | if (thread_db_load_search ()) | |
9ddc1af1 | 1205 | return true; |
17a37d48 | 1206 | |
98a5dd13 DE |
1207 | /* We couldn't find a libthread_db. |
1208 | If the inferior has a libpthread warn the user. */ | |
1209 | if (has_libpthread ()) | |
1210 | { | |
1211 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1212 | " library, thread debugging will not be available.")); | |
9ddc1af1 | 1213 | return false; |
17a37d48 | 1214 | } |
98a5dd13 | 1215 | |
17a37d48 PP |
1216 | /* Either this executable isn't using libpthread at all, or it is |
1217 | statically linked. Since we can't easily distinguish these two cases, | |
1218 | no warning is issued. */ | |
9ddc1af1 | 1219 | return false; |
17a37d48 PP |
1220 | } |
1221 | ||
fb0e1ba7 MK |
1222 | static void |
1223 | check_thread_signals (void) | |
1224 | { | |
21bf60fe | 1225 | if (!thread_signals) |
fb0e1ba7 | 1226 | { |
fb0e1ba7 MK |
1227 | int i; |
1228 | ||
089436f7 | 1229 | for (i = 0; i < lin_thread_get_thread_signal_num (); i++) |
fb0e1ba7 | 1230 | { |
089436f7 TV |
1231 | int sig = lin_thread_get_thread_signal (i); |
1232 | signal_stop_update (gdb_signal_from_host (sig), 0); | |
1233 | signal_print_update (gdb_signal_from_host (sig), 0); | |
1234 | thread_signals = 1; | |
fb0e1ba7 MK |
1235 | } |
1236 | } | |
fb0e1ba7 MK |
1237 | } |
1238 | ||
0ec9a092 DJ |
1239 | /* Check whether thread_db is usable. This function is called when |
1240 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1241 | and when new shared libraries are loaded into a running process. */ | |
1242 | ||
1243 | void | |
1244 | check_for_thread_db (void) | |
fb0e1ba7 | 1245 | { |
b5057acd | 1246 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1247 | if (!thread_db_load ()) |
b5057acd | 1248 | return; |
0ec9a092 DJ |
1249 | } |
1250 | ||
0838fb57 DE |
1251 | /* This function is called via the new_objfile observer. */ |
1252 | ||
0ec9a092 DJ |
1253 | static void |
1254 | thread_db_new_objfile (struct objfile *objfile) | |
1255 | { | |
d90e17a7 PA |
1256 | /* This observer must always be called with inferior_ptid set |
1257 | correctly. */ | |
1258 | ||
0838fb57 | 1259 | if (objfile != NULL |
fcb44371 | 1260 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 1261 | loaded (and notified without successful thread_db initialization) |
76727919 | 1262 | the time gdb::observers::new_objfile.notify is called for the library itself. |
fcb44371 JK |
1263 | Static executables have their separate debug info loaded already |
1264 | before the inferior has started. */ | |
1265 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1266 | /* Only check for thread_db if we loaded libpthread, |
1267 | or if this is the main symbol file. | |
1268 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1269 | a statically linked executable AND the symbol file is specified AFTER | |
1270 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1271 | For dynamically linked executables, libpthread can be near the end | |
1272 | of the list of shared libraries to load, and in an app of several | |
1273 | thousand shared libraries, this can otherwise be painful. */ | |
1274 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 1275 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 1276 | check_for_thread_db (); |
fb0e1ba7 MK |
1277 | } |
1278 | ||
015de688 | 1279 | static void |
3f66685e | 1280 | check_pid_namespace_match (inferior *inf) |
015de688 DC |
1281 | { |
1282 | /* Check is only relevant for local targets targets. */ | |
f6ac5f3d | 1283 | if (target_can_run ()) |
015de688 DC |
1284 | { |
1285 | /* If the child is in a different PID namespace, its idea of its | |
1286 | PID will differ from our idea of its PID. When we scan the | |
1287 | child's thread list, we'll mistakenly think it has no threads | |
1288 | since the thread PID fields won't match the PID we give to | |
1289 | libthread_db. */ | |
3f66685e | 1290 | if (!linux_ns_same (inf->pid, LINUX_NS_PID)) |
015de688 DC |
1291 | { |
1292 | warning (_ ("Target and debugger are in different PID " | |
1293 | "namespaces; thread lists and other data are " | |
708bf0a1 JK |
1294 | "likely unreliable. " |
1295 | "Connect to gdbserver inside the container.")); | |
015de688 | 1296 | } |
015de688 DC |
1297 | } |
1298 | } | |
1299 | ||
0838fb57 DE |
1300 | /* This function is called via the inferior_created observer. |
1301 | This handles the case of debugging statically linked executables. */ | |
1302 | ||
1303 | static void | |
a0ff652f | 1304 | thread_db_inferior_created (inferior *inf) |
0838fb57 | 1305 | { |
3f66685e | 1306 | check_pid_namespace_match (inf); |
0838fb57 DE |
1307 | check_for_thread_db (); |
1308 | } | |
1309 | ||
c1a747c1 PA |
1310 | /* Update the thread's state (what's displayed in "info threads"), |
1311 | from libthread_db thread state information. */ | |
1312 | ||
1313 | static void | |
7aabaf9d | 1314 | update_thread_state (thread_db_thread_info *priv, |
c1a747c1 PA |
1315 | const td_thrinfo_t *ti_p) |
1316 | { | |
fe978cb0 PA |
1317 | priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN |
1318 | || ti_p->ti_state == TD_THR_ZOMBIE); | |
c1a747c1 PA |
1319 | } |
1320 | ||
2db9a427 | 1321 | /* Record a new thread in GDB's thread list. Creates the thread's |
be550b6e DE |
1322 | private info. If TP is NULL or TP is marked as having exited, |
1323 | creates a new thread. Otherwise, uses TP. */ | |
2db9a427 | 1324 | |
be550b6e | 1325 | static struct thread_info * |
2db9a427 PA |
1326 | record_thread (struct thread_db_info *info, |
1327 | struct thread_info *tp, | |
1328 | ptid_t ptid, const td_thrhandle_t *th_p, | |
1329 | const td_thrinfo_t *ti_p) | |
1330 | { | |
2db9a427 PA |
1331 | /* A thread ID of zero may mean the thread library has not |
1332 | initialized yet. Leave private == NULL until the thread library | |
1333 | has initialized. */ | |
1334 | if (ti_p->ti_tid == 0) | |
be550b6e | 1335 | return tp; |
2db9a427 | 1336 | |
17faa917 | 1337 | /* Construct the thread's private data. */ |
7aabaf9d | 1338 | thread_db_thread_info *priv = new thread_db_thread_info; |
17faa917 | 1339 | |
fe978cb0 PA |
1340 | priv->th = *th_p; |
1341 | priv->tid = ti_p->ti_tid; | |
1342 | update_thread_state (priv, ti_p); | |
17faa917 | 1343 | |
4eec2deb PA |
1344 | /* Add the thread to GDB's thread list. If we already know about a |
1345 | thread with this PTID, but it's marked exited, then the kernel | |
1346 | reused the tid of an old thread. */ | |
1347 | if (tp == NULL || tp->state == THREAD_EXITED) | |
5b6d1e4f | 1348 | tp = add_thread_with_info (info->process_target, ptid, priv); |
17faa917 | 1349 | else |
7aabaf9d | 1350 | tp->priv.reset (priv); |
5365276c | 1351 | |
55f6301a | 1352 | if (target_has_execution ()) |
2db9a427 | 1353 | check_thread_signals (); |
be550b6e DE |
1354 | |
1355 | return tp; | |
fb0e1ba7 MK |
1356 | } |
1357 | ||
f6ac5f3d PA |
1358 | void |
1359 | thread_db_target::detach (inferior *inf, int from_tty) | |
fb0e1ba7 | 1360 | { |
5b6d1e4f | 1361 | delete_thread_db_info (inf->process_target (), inf->pid); |
4105de34 | 1362 | |
d6ca69cd | 1363 | beneath ()->detach (inf, from_tty); |
d90e17a7 PA |
1364 | |
1365 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1366 | ||
5b6d1e4f | 1367 | /* Detach the thread_db target from this inferior. */ |
fadf6add | 1368 | inf->unpush_target (this); |
fb0e1ba7 MK |
1369 | } |
1370 | ||
f6ac5f3d PA |
1371 | ptid_t |
1372 | thread_db_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
b60cea74 | 1373 | target_wait_flags options) |
fb0e1ba7 | 1374 | { |
d90e17a7 | 1375 | struct thread_db_info *info; |
117de6a9 | 1376 | |
5b6d1e4f PA |
1377 | process_stratum_target *beneath |
1378 | = as_process_stratum_target (this->beneath ()); | |
1379 | ||
1380 | ptid = beneath->wait (ptid, ourstatus, options); | |
fb0e1ba7 | 1381 | |
aa01bd36 PA |
1382 | switch (ourstatus->kind) |
1383 | { | |
1384 | case TARGET_WAITKIND_IGNORE: | |
1385 | case TARGET_WAITKIND_EXITED: | |
1386 | case TARGET_WAITKIND_THREAD_EXITED: | |
1387 | case TARGET_WAITKIND_SIGNALLED: | |
294c36eb | 1388 | case TARGET_WAITKIND_EXECD: |
aa01bd36 PA |
1389 | return ptid; |
1390 | } | |
fb0e1ba7 | 1391 | |
5b6d1e4f | 1392 | info = get_thread_db_info (beneath, ptid.pid ()); |
d90e17a7 PA |
1393 | |
1394 | /* If this process isn't using thread_db, we're done. */ | |
1395 | if (info == NULL) | |
1396 | return ptid; | |
1397 | ||
2db9a427 | 1398 | /* Fill in the thread's user-level thread id and status. */ |
5b6d1e4f | 1399 | thread_from_lwp (find_thread_ptid (beneath, ptid), ptid); |
fb0e1ba7 | 1400 | |
b9b5d7ea | 1401 | return ptid; |
fb0e1ba7 MK |
1402 | } |
1403 | ||
f6ac5f3d PA |
1404 | void |
1405 | thread_db_target::mourn_inferior () | |
fb0e1ba7 | 1406 | { |
5b6d1e4f PA |
1407 | process_stratum_target *target_beneath |
1408 | = as_process_stratum_target (this->beneath ()); | |
1409 | ||
1410 | delete_thread_db_info (target_beneath, inferior_ptid.pid ()); | |
fb0e1ba7 | 1411 | |
5b6d1e4f | 1412 | target_beneath->mourn_inferior (); |
d90e17a7 | 1413 | |
5b6d1e4f | 1414 | /* Detach the thread_db target from this inferior. */ |
fadf6add | 1415 | current_inferior ()->unpush_target (this); |
fb0e1ba7 MK |
1416 | } |
1417 | ||
294c36eb SM |
1418 | void |
1419 | thread_db_target::follow_exec (inferior *follow_inf, ptid_t ptid, | |
1420 | const char *execd_pathname) | |
1421 | { | |
1422 | process_stratum_target *beneath | |
1423 | = as_process_stratum_target (this->beneath ()); | |
1424 | ||
1425 | delete_thread_db_info (beneath, ptid.pid ()); | |
1426 | ||
1427 | current_inferior ()->unpush_target (this); | |
1428 | beneath->follow_exec (follow_inf, ptid, execd_pathname); | |
1429 | } | |
1430 | ||
02c6c942 PP |
1431 | struct callback_data |
1432 | { | |
1433 | struct thread_db_info *info; | |
1434 | int new_threads; | |
1435 | }; | |
1436 | ||
fb0e1ba7 MK |
1437 | static int |
1438 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1439 | { | |
1440 | td_thrinfo_t ti; | |
1441 | td_err_e err; | |
403fe197 | 1442 | struct thread_info *tp; |
9a3c8263 | 1443 | struct callback_data *cb_data = (struct callback_data *) data; |
02c6c942 | 1444 | struct thread_db_info *info = cb_data->info; |
fb0e1ba7 | 1445 | |
d90e17a7 | 1446 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1447 | if (err != TD_OK) |
8a3fe4f8 | 1448 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1449 | thread_db_err_str (err)); |
fb0e1ba7 | 1450 | |
a33e3959 PA |
1451 | if (ti.ti_lid == -1) |
1452 | { | |
1453 | /* A thread with kernel thread ID -1 is either a thread that | |
1454 | exited and was joined, or a thread that is being created but | |
1455 | hasn't started yet, and that is reusing the tcb/stack of a | |
1456 | thread that previously exited and was joined. (glibc marks | |
1457 | terminated and joined threads with kernel thread ID -1. See | |
1458 | glibc PR17707. */ | |
d6c146e9 PA |
1459 | if (libthread_db_debug) |
1460 | fprintf_unfiltered (gdb_stdlog, | |
1461 | "thread_db: skipping exited and " | |
d41401ac DE |
1462 | "joined thread (0x%lx)\n", |
1463 | (unsigned long) ti.ti_tid); | |
a33e3959 PA |
1464 | return 0; |
1465 | } | |
1466 | ||
254f582e | 1467 | if (ti.ti_tid == 0) |
4105de34 DJ |
1468 | { |
1469 | /* A thread ID of zero means that this is the main thread, but | |
1470 | glibc has not yet initialized thread-local storage and the | |
1471 | pthread library. We do not know what the thread's TID will | |
c2c2a31f | 1472 | be yet. */ |
4105de34 | 1473 | |
4d062f1a PA |
1474 | /* In that case, we're not stopped in a fork syscall and don't |
1475 | need this glibc bug workaround. */ | |
1476 | info->need_stale_parent_threads_check = 0; | |
1477 | ||
4105de34 DJ |
1478 | return 0; |
1479 | } | |
1480 | ||
4d062f1a PA |
1481 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1482 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1483 | avoid doing the work if we know we don't have to. */ | |
1484 | if (info->need_stale_parent_threads_check) | |
1485 | { | |
1486 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1487 | |
4d062f1a PA |
1488 | if (tgid != -1 && tgid != info->pid) |
1489 | return 0; | |
1490 | } | |
1491 | ||
00431a78 | 1492 | ptid_t ptid (info->pid, ti.ti_lid); |
5b6d1e4f | 1493 | tp = find_thread_ptid (info->process_target, ptid); |
fe978cb0 | 1494 | if (tp == NULL || tp->priv == NULL) |
60269a4a | 1495 | record_thread (info, tp, ptid, th_p, &ti); |
fb0e1ba7 MK |
1496 | |
1497 | return 0; | |
1498 | } | |
1499 | ||
02c6c942 PP |
1500 | /* Helper for thread_db_find_new_threads_2. |
1501 | Returns number of new threads found. */ | |
1502 | ||
1503 | static int | |
1504 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1505 | td_err_e *errp) |
02c6c942 | 1506 | { |
02c6c942 | 1507 | struct callback_data data; |
fb169834 | 1508 | td_err_e err = TD_ERR; |
02c6c942 PP |
1509 | |
1510 | data.info = info; | |
1511 | data.new_threads = 0; | |
1512 | ||
2db9a427 | 1513 | /* See comment in thread_db_update_thread_list. */ |
1eb2dbb8 | 1514 | gdb_assert (info->td_ta_thr_iter_p != NULL); |
2db9a427 | 1515 | |
a70b8144 | 1516 | try |
02c6c942 PP |
1517 | { |
1518 | /* Iterate over all user-space threads to discover new threads. */ | |
1519 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1520 | find_new_threads_callback, | |
1521 | &data, | |
1522 | TD_THR_ANY_STATE, | |
1523 | TD_THR_LOWEST_PRIORITY, | |
1524 | TD_SIGNO_MASK, | |
1525 | TD_THR_ANY_USER_FLAGS); | |
1526 | } | |
230d2906 | 1527 | catch (const gdb_exception_error &except) |
02c6c942 | 1528 | { |
6c63c96a | 1529 | if (libthread_db_debug) |
492d29ea PA |
1530 | { |
1531 | exception_fprintf (gdb_stdlog, except, | |
1532 | "Warning: find_new_threads_once: "); | |
1533 | } | |
6c63c96a | 1534 | } |
02c6c942 | 1535 | |
6c63c96a PA |
1536 | if (libthread_db_debug) |
1537 | { | |
883ed13e PA |
1538 | fprintf_unfiltered (gdb_stdlog, |
1539 | _("Found %d new threads in iteration %d.\n"), | |
1540 | data.new_threads, iteration); | |
02c6c942 PP |
1541 | } |
1542 | ||
1543 | if (errp != NULL) | |
1544 | *errp = err; | |
1545 | ||
1546 | return data.new_threads; | |
1547 | } | |
1548 | ||
4c28f408 | 1549 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1550 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1551 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1552 | |
fb0e1ba7 | 1553 | static void |
00431a78 | 1554 | thread_db_find_new_threads_2 (thread_info *stopped, bool until_no_new) |
fb0e1ba7 | 1555 | { |
fcb44371 | 1556 | td_err_e err = TD_OK; |
d90e17a7 | 1557 | struct thread_db_info *info; |
02c6c942 | 1558 | int i, loop; |
4c28f408 | 1559 | |
5b6d1e4f PA |
1560 | info = get_thread_db_info (stopped->inf->process_target (), |
1561 | stopped->ptid.pid ()); | |
d90e17a7 | 1562 | |
4c28f408 | 1563 | /* Access an lwp we know is stopped. */ |
00431a78 | 1564 | info->proc_handle.thread = stopped; |
02c6c942 PP |
1565 | |
1566 | if (until_no_new) | |
1567 | { | |
1568 | /* Require 4 successive iterations which do not find any new threads. | |
1569 | The 4 is a heuristic: there is an inherent race here, and I have | |
1570 | seen that 2 iterations in a row are not always sufficient to | |
1571 | "capture" all threads. */ | |
fcb44371 JK |
1572 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1573 | if (find_new_threads_once (info, i, &err) != 0) | |
1574 | { | |
1575 | /* Found some new threads. Restart the loop from beginning. */ | |
1576 | loop = -1; | |
1577 | } | |
02c6c942 PP |
1578 | } |
1579 | else | |
fcb44371 JK |
1580 | find_new_threads_once (info, 0, &err); |
1581 | ||
1582 | if (err != TD_OK) | |
1583 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1584 | } |
1585 | ||
02c6c942 | 1586 | static void |
00431a78 | 1587 | thread_db_find_new_threads_1 (thread_info *stopped) |
02c6c942 | 1588 | { |
00431a78 | 1589 | thread_db_find_new_threads_2 (stopped, 0); |
02c6c942 PP |
1590 | } |
1591 | ||
a6904d5a PA |
1592 | /* Implement the to_update_thread_list target method for this |
1593 | target. */ | |
2db9a427 | 1594 | |
f6ac5f3d PA |
1595 | void |
1596 | thread_db_target::update_thread_list () | |
28439f5e | 1597 | { |
d90e17a7 PA |
1598 | struct thread_db_info *info; |
1599 | ||
e8032dde PA |
1600 | prune_threads (); |
1601 | ||
08036331 | 1602 | for (inferior *inf : all_inferiors ()) |
c65b3e0d | 1603 | { |
c65b3e0d PA |
1604 | if (inf->pid == 0) |
1605 | continue; | |
d90e17a7 | 1606 | |
5b6d1e4f | 1607 | info = get_thread_db_info (inf->process_target (), inf->pid); |
c65b3e0d PA |
1608 | if (info == NULL) |
1609 | continue; | |
1610 | ||
5b6d1e4f | 1611 | thread_info *thread = any_live_thread_of_inferior (inf); |
c65b3e0d PA |
1612 | if (thread == NULL || thread->executing) |
1613 | continue; | |
1614 | ||
a6904d5a PA |
1615 | /* It's best to avoid td_ta_thr_iter if possible. That walks |
1616 | data structures in the inferior's address space that may be | |
1617 | corrupted, or, if the target is running, the list may change | |
1618 | while we walk it. In the latter case, it's possible that a | |
1619 | thread exits just at the exact time that causes GDB to get | |
1620 | stuck in an infinite loop. To avoid pausing all threads | |
1621 | whenever the core wants to refresh the thread list, we | |
1622 | instead use thread_from_lwp immediately when we see an LWP | |
1623 | stop. That uses thread_db entry points that do not walk | |
1624 | libpthread's thread list, so should be safe, as well as more | |
1625 | efficient. */ | |
5018ce90 | 1626 | if (thread->inf->has_execution ()) |
a6904d5a PA |
1627 | continue; |
1628 | ||
00431a78 | 1629 | thread_db_find_new_threads_1 (thread); |
c65b3e0d | 1630 | } |
2db9a427 | 1631 | |
a6904d5a | 1632 | /* Give the beneath target a chance to do extra processing. */ |
b6a8c27b | 1633 | this->beneath ()->update_thread_list (); |
28439f5e PA |
1634 | } |
1635 | ||
a068643d | 1636 | std::string |
f6ac5f3d | 1637 | thread_db_target::pid_to_str (ptid_t ptid) |
fb0e1ba7 | 1638 | { |
5b6d1e4f | 1639 | thread_info *thread_info = find_thread_ptid (current_inferior (), ptid); |
17faa917 | 1640 | |
fe978cb0 | 1641 | if (thread_info != NULL && thread_info->priv != NULL) |
fb0e1ba7 | 1642 | { |
7aabaf9d | 1643 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
fb0e1ba7 | 1644 | |
a068643d TT |
1645 | return string_printf ("Thread 0x%lx (LWP %ld)", |
1646 | (unsigned long) priv->tid, ptid.lwp ()); | |
fb0e1ba7 MK |
1647 | } |
1648 | ||
d6ca69cd | 1649 | return beneath ()->pid_to_str (ptid); |
fb0e1ba7 MK |
1650 | } |
1651 | ||
28b17333 DJ |
1652 | /* Return a string describing the state of the thread specified by |
1653 | INFO. */ | |
1654 | ||
f6ac5f3d PA |
1655 | const char * |
1656 | thread_db_target::extra_thread_info (thread_info *info) | |
28b17333 | 1657 | { |
fe978cb0 | 1658 | if (info->priv == NULL) |
17faa917 DJ |
1659 | return NULL; |
1660 | ||
7aabaf9d SM |
1661 | thread_db_thread_info *priv = get_thread_db_thread_info (info); |
1662 | ||
1663 | if (priv->dying) | |
28b17333 DJ |
1664 | return "Exiting"; |
1665 | ||
1666 | return NULL; | |
1667 | } | |
1668 | ||
e04ee09e KB |
1669 | /* Return pointer to the thread_info struct which corresponds to |
1670 | THREAD_HANDLE (having length HANDLE_LEN). */ | |
1671 | ||
f6ac5f3d PA |
1672 | thread_info * |
1673 | thread_db_target::thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
1674 | int handle_len, | |
1675 | inferior *inf) | |
e04ee09e | 1676 | { |
e04ee09e KB |
1677 | thread_t handle_tid; |
1678 | ||
6bdfee81 KB |
1679 | /* When debugging a 32-bit target from a 64-bit host, handle_len |
1680 | will be 4 and sizeof (handle_tid) will be 8. This requires | |
1681 | a different cast than the more straightforward case where | |
1682 | the sizes are the same. | |
1683 | ||
1684 | Use "--target_board unix/-m32" from a native x86_64 linux build | |
1685 | to test the 32/64-bit case. */ | |
1686 | if (handle_len == 4 && sizeof (handle_tid) == 8) | |
1687 | handle_tid = (thread_t) * (const uint32_t *) thread_handle; | |
1688 | else if (handle_len == sizeof (handle_tid)) | |
1689 | handle_tid = * (const thread_t *) thread_handle; | |
1690 | else | |
e04ee09e KB |
1691 | error (_("Thread handle size mismatch: %d vs %zu (from libthread_db)"), |
1692 | handle_len, sizeof (handle_tid)); | |
1693 | ||
08036331 | 1694 | for (thread_info *tp : inf->non_exited_threads ()) |
e04ee09e | 1695 | { |
7aabaf9d SM |
1696 | thread_db_thread_info *priv = get_thread_db_thread_info (tp); |
1697 | ||
08036331 | 1698 | if (priv != NULL && handle_tid == priv->tid) |
dda83cd7 | 1699 | return tp; |
e04ee09e KB |
1700 | } |
1701 | ||
1702 | return NULL; | |
1703 | } | |
3d6c6204 KB |
1704 | |
1705 | /* Return the thread handle associated the thread_info pointer TP. */ | |
1706 | ||
1707 | gdb::byte_vector | |
1708 | thread_db_target::thread_info_to_thread_handle (struct thread_info *tp) | |
1709 | { | |
1710 | thread_db_thread_info *priv = get_thread_db_thread_info (tp); | |
1711 | ||
1712 | if (priv == NULL) | |
1713 | return gdb::byte_vector (); | |
1714 | ||
1715 | int handle_size = sizeof (priv->tid); | |
1716 | gdb::byte_vector rv (handle_size); | |
1717 | ||
1718 | memcpy (rv.data (), &priv->tid, handle_size); | |
1719 | ||
1720 | return rv; | |
1721 | } | |
e04ee09e | 1722 | |
b2756930 KB |
1723 | /* Get the address of the thread local variable in load module LM which |
1724 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c | 1725 | |
f6ac5f3d PA |
1726 | CORE_ADDR |
1727 | thread_db_target::get_thread_local_address (ptid_t ptid, | |
1728 | CORE_ADDR lm, | |
1729 | CORE_ADDR offset) | |
3f47be5c | 1730 | { |
17faa917 | 1731 | struct thread_info *thread_info; |
5b6d1e4f PA |
1732 | process_stratum_target *beneath |
1733 | = as_process_stratum_target (this->beneath ()); | |
17faa917 | 1734 | /* Find the matching thread. */ |
5b6d1e4f | 1735 | thread_info = find_thread_ptid (beneath, ptid); |
4105de34 | 1736 | |
e0fd7c47 UW |
1737 | /* We may not have discovered the thread yet. */ |
1738 | if (thread_info != NULL && thread_info->priv == NULL) | |
00431a78 | 1739 | thread_info = thread_from_lwp (thread_info, ptid); |
e0fd7c47 | 1740 | |
fe978cb0 | 1741 | if (thread_info != NULL && thread_info->priv != NULL) |
3f47be5c | 1742 | { |
3f47be5c | 1743 | td_err_e err; |
00f515da | 1744 | psaddr_t address; |
5b6d1e4f | 1745 | thread_db_info *info = get_thread_db_info (beneath, ptid.pid ()); |
7aabaf9d | 1746 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
3f47be5c | 1747 | |
3f47be5c | 1748 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1749 | if (lm != 0) |
1750 | { | |
1751 | /* glibc doesn't provide the needed interface. */ | |
1752 | if (!info->td_thr_tls_get_addr_p) | |
1753 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1754 | _("No TLS library support")); | |
1755 | ||
1756 | /* Note the cast through uintptr_t: this interface only works if | |
1757 | a target address fits in a psaddr_t, which is a host pointer. | |
1758 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
7aabaf9d | 1759 | err = info->td_thr_tls_get_addr_p (&priv->th, |
5876f503 JK |
1760 | (psaddr_t)(uintptr_t) lm, |
1761 | offset, &address); | |
1762 | } | |
1763 | else | |
1764 | { | |
1765 | /* If glibc doesn't provide the needed interface throw an error | |
1766 | that LM is zero - normally cases it should not be. */ | |
1767 | if (!info->td_thr_tlsbase_p) | |
1768 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1769 | _("TLS load module not found")); | |
1770 | ||
1771 | /* This code path handles the case of -static -pthread executables: | |
1772 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1773 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1774 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1775 | The constant number 1 depends on GNU __libc_setup_tls | |
1776 | initialization of l_tls_modid to 1. */ | |
7aabaf9d | 1777 | err = info->td_thr_tlsbase_p (&priv->th, 1, &address); |
5876f503 JK |
1778 | address = (char *) address + offset; |
1779 | } | |
3f47be5c EZ |
1780 | |
1781 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1782 | /* The memory hasn't been allocated, yet. */ | |
1783 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1784 | /* Now, if libthread_db provided the initialization image's |
1785 | address, we *could* try to build a non-lvalue value from | |
1786 | the initialization image. */ | |
dda83cd7 SM |
1787 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1788 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1789 | #endif |
1790 | ||
1791 | /* Something else went wrong. */ | |
1792 | if (err != TD_OK) | |
dda83cd7 SM |
1793 | throw_error (TLS_GENERIC_ERROR, |
1794 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1795 | |
1796 | /* Cast assuming host == target. Joy. */ | |
16451949 | 1797 | /* Do proper sign extension for the target. */ |
7e10abd1 TT |
1798 | gdb_assert (current_program_space->exec_bfd ()); |
1799 | return (bfd_get_sign_extend_vma (current_program_space->exec_bfd ()) > 0 | |
16451949 AS |
1800 | ? (CORE_ADDR) (intptr_t) address |
1801 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1802 | } |
1803 | ||
5b6d1e4f | 1804 | return beneath->get_thread_local_address (ptid, lm, offset); |
3f47be5c EZ |
1805 | } |
1806 | ||
0ef643c8 JB |
1807 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
1808 | ||
f6ac5f3d PA |
1809 | ptid_t |
1810 | thread_db_target::get_ada_task_ptid (long lwp, long thread) | |
0ef643c8 | 1811 | { |
2db9a427 | 1812 | /* NPTL uses a 1:1 model, so the LWP id suffices. */ |
e99b03dc | 1813 | return ptid_t (inferior_ptid.pid (), lwp, 0); |
0ef643c8 JB |
1814 | } |
1815 | ||
f6ac5f3d PA |
1816 | void |
1817 | thread_db_target::resume (ptid_t ptid, int step, enum gdb_signal signo) | |
4d062f1a | 1818 | { |
5b6d1e4f PA |
1819 | process_stratum_target *beneath |
1820 | = as_process_stratum_target (this->beneath ()); | |
4d062f1a | 1821 | |
5b6d1e4f PA |
1822 | thread_db_info *info |
1823 | = get_thread_db_info (beneath, (ptid == minus_one_ptid | |
1824 | ? inferior_ptid.pid () | |
1825 | : ptid.pid ())); | |
4d062f1a PA |
1826 | |
1827 | /* This workaround is only needed for child fork lwps stopped in a | |
1828 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1829 | workaround can be disabled. */ | |
1830 | if (info) | |
1831 | info->need_stale_parent_threads_check = 0; | |
1832 | ||
5b6d1e4f | 1833 | beneath->resume (ptid, step, signo); |
4d062f1a PA |
1834 | } |
1835 | ||
9b292f68 | 1836 | /* std::sort helper function for info_auto_load_libthread_db, sort the |
bf88dd68 JK |
1837 | thread_db_info pointers primarily by their FILENAME and secondarily by their |
1838 | PID, both in ascending order. */ | |
1839 | ||
9b292f68 TT |
1840 | static bool |
1841 | info_auto_load_libthread_db_compare (const struct thread_db_info *a, | |
1842 | const struct thread_db_info *b) | |
bf88dd68 | 1843 | { |
bf88dd68 JK |
1844 | int retval; |
1845 | ||
1846 | retval = strcmp (a->filename, b->filename); | |
1847 | if (retval) | |
9b292f68 | 1848 | return retval < 0; |
bf88dd68 | 1849 | |
9b292f68 | 1850 | return a->pid < b->pid; |
bf88dd68 JK |
1851 | } |
1852 | ||
1853 | /* Implement 'info auto-load libthread-db'. */ | |
1854 | ||
1855 | static void | |
5fed81ff | 1856 | info_auto_load_libthread_db (const char *args, int from_tty) |
bf88dd68 JK |
1857 | { |
1858 | struct ui_out *uiout = current_uiout; | |
1859 | const char *cs = args ? args : ""; | |
9b292f68 TT |
1860 | struct thread_db_info *info; |
1861 | unsigned unique_filenames; | |
1862 | size_t max_filename_len, pids_len; | |
bf88dd68 JK |
1863 | int i; |
1864 | ||
f1735a53 | 1865 | cs = skip_spaces (cs); |
bf88dd68 JK |
1866 | if (*cs) |
1867 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1868 | ||
9b292f68 | 1869 | std::vector<struct thread_db_info *> array; |
bf88dd68 JK |
1870 | for (info = thread_db_list; info; info = info->next) |
1871 | if (info->filename != NULL) | |
9b292f68 | 1872 | array.push_back (info); |
bf88dd68 JK |
1873 | |
1874 | /* Sort ARRAY by filenames and PIDs. */ | |
9b292f68 TT |
1875 | std::sort (array.begin (), array.end (), |
1876 | info_auto_load_libthread_db_compare); | |
bf88dd68 JK |
1877 | |
1878 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1879 | length of PIDs list for the unique filenames (columns). */ | |
1880 | ||
1881 | unique_filenames = 0; | |
1882 | max_filename_len = 0; | |
bf88dd68 | 1883 | pids_len = 0; |
9b292f68 | 1884 | for (i = 0; i < array.size (); i++) |
bf88dd68 JK |
1885 | { |
1886 | int pid = array[i]->pid; | |
1887 | size_t this_pid_len; | |
1888 | ||
1889 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1890 | this_pid_len++; | |
1891 | ||
1892 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1893 | { | |
1894 | unique_filenames++; | |
325fac50 PA |
1895 | max_filename_len = std::max (max_filename_len, |
1896 | strlen (array[i]->filename)); | |
bf88dd68 JK |
1897 | |
1898 | if (i > 0) | |
9b292f68 | 1899 | pids_len -= strlen (", "); |
bf88dd68 JK |
1900 | pids_len = 0; |
1901 | } | |
1902 | pids_len += this_pid_len + strlen (", "); | |
1903 | } | |
1904 | if (i) | |
9b292f68 | 1905 | pids_len -= strlen (", "); |
bf88dd68 JK |
1906 | |
1907 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1908 | its columns. */ | |
9b292f68 | 1909 | if (array.size () > 0 && args == auto_load_info_scripts_pattern_nl) |
112e8700 | 1910 | uiout->text ("\n"); |
bf88dd68 | 1911 | |
4a2b031d TT |
1912 | { |
1913 | ui_out_emit_table table_emitter (uiout, 2, unique_filenames, | |
1914 | "LinuxThreadDbTable"); | |
bf88dd68 | 1915 | |
4a2b031d TT |
1916 | uiout->table_header (max_filename_len, ui_left, "filename", "Filename"); |
1917 | uiout->table_header (pids_len, ui_left, "PIDs", "Pids"); | |
1918 | uiout->table_body (); | |
bf88dd68 | 1919 | |
4a2b031d | 1920 | /* Note I is incremented inside the cycle, not at its end. */ |
9b292f68 | 1921 | for (i = 0; i < array.size ();) |
4a2b031d TT |
1922 | { |
1923 | ui_out_emit_tuple tuple_emitter (uiout, NULL); | |
bf88dd68 | 1924 | |
4a2b031d TT |
1925 | info = array[i]; |
1926 | uiout->field_string ("filename", info->filename); | |
bf88dd68 | 1927 | |
9b292f68 TT |
1928 | std::string pids; |
1929 | while (i < array.size () && strcmp (info->filename, | |
1930 | array[i]->filename) == 0) | |
4a2b031d | 1931 | { |
9b292f68 TT |
1932 | if (!pids.empty ()) |
1933 | pids += ", "; | |
1934 | string_appendf (pids, "%u", array[i]->pid); | |
4a2b031d TT |
1935 | i++; |
1936 | } | |
bf88dd68 | 1937 | |
9b292f68 | 1938 | uiout->field_string ("pids", pids.c_str ()); |
bf88dd68 | 1939 | |
4a2b031d TT |
1940 | uiout->text ("\n"); |
1941 | } | |
1942 | } | |
bf88dd68 | 1943 | |
9b292f68 | 1944 | if (array.empty ()) |
112e8700 | 1945 | uiout->message (_("No auto-loaded libthread-db.\n")); |
bf88dd68 JK |
1946 | } |
1947 | ||
5045b3d7 GB |
1948 | /* Implement 'maintenance check libthread-db'. */ |
1949 | ||
1950 | static void | |
1951 | maintenance_check_libthread_db (const char *args, int from_tty) | |
1952 | { | |
e99b03dc | 1953 | int inferior_pid = inferior_ptid.pid (); |
5045b3d7 GB |
1954 | struct thread_db_info *info; |
1955 | ||
1956 | if (inferior_pid == 0) | |
1957 | error (_("No inferior running")); | |
1958 | ||
5b6d1e4f PA |
1959 | info = get_thread_db_info (current_inferior ()->process_target (), |
1960 | inferior_pid); | |
5045b3d7 GB |
1961 | if (info == NULL) |
1962 | error (_("No libthread_db loaded")); | |
1963 | ||
1964 | check_thread_db (info, true); | |
1965 | } | |
1966 | ||
6c265988 | 1967 | void _initialize_thread_db (); |
fb0e1ba7 | 1968 | void |
6c265988 | 1969 | _initialize_thread_db () |
fb0e1ba7 | 1970 | { |
17a37d48 PP |
1971 | /* Defer loading of libthread_db.so until inferior is running. |
1972 | This allows gdb to load correct libthread_db for a given | |
4a6ed09b PA |
1973 | executable -- there could be multiple versions of glibc, |
1974 | and until there is a running inferior, we can't tell which | |
1975 | libthread_db is the correct one to load. */ | |
17a37d48 PP |
1976 | |
1977 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1978 | ||
1979 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1980 | class_support, | |
1981 | &libthread_db_search_path, _("\ | |
1982 | Set search path for libthread_db."), _("\ | |
1983 | Show the current search path or libthread_db."), _("\ | |
1984 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
1985 | gdb itself.\n\ |
1986 | Its value is a colon (':') separate list of directories to search.\n\ | |
1987 | Setting the search path to an empty list resets it to its default value."), | |
1988 | set_libthread_db_search_path, | |
17a37d48 PP |
1989 | NULL, |
1990 | &setlist, &showlist); | |
02d868e8 | 1991 | |
ccce17b0 YQ |
1992 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
1993 | &libthread_db_debug, _("\ | |
02d868e8 PP |
1994 | Set libthread-db debugging."), _("\ |
1995 | Show libthread-db debugging."), _("\ | |
1996 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
1997 | NULL, |
1998 | show_libthread_db_debug, | |
1999 | &setdebuglist, &showdebuglist); | |
02d868e8 | 2000 | |
bf88dd68 JK |
2001 | add_setshow_boolean_cmd ("libthread-db", class_support, |
2002 | &auto_load_thread_db, _("\ | |
2003 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
2004 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
2005 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
2006 | locations to load libthread_db compatible with the inferior.\n\ | |
2007 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
8d8c087f | 2008 | This option has security implications for untrusted inferiors."), |
bf88dd68 JK |
2009 | NULL, show_auto_load_thread_db, |
2010 | auto_load_set_cmdlist_get (), | |
2011 | auto_load_show_cmdlist_get ()); | |
2012 | ||
2013 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
2014 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
2015 | Usage: info auto-load libthread-db"), | |
2016 | auto_load_info_cmdlist_get ()); | |
2017 | ||
5045b3d7 GB |
2018 | add_cmd ("libthread-db", class_maintenance, |
2019 | maintenance_check_libthread_db, _("\ | |
2020 | Run integrity checks on the current inferior's libthread_db."), | |
2021 | &maintenancechecklist); | |
2022 | ||
2023 | add_setshow_boolean_cmd ("check-libthread-db", | |
2024 | class_maintenance, | |
2025 | &check_thread_db_on_load, _("\ | |
2026 | Set whether to check libthread_db at load time."), _("\ | |
2027 | Show whether to check libthread_db at load time."), _("\ | |
2028 | If enabled GDB will run integrity checks on inferior specific libthread_db\n\ | |
2029 | as they are loaded."), | |
2030 | NULL, | |
2031 | NULL, | |
2032 | &maintenance_set_cmdlist, | |
2033 | &maintenance_show_cmdlist); | |
2034 | ||
17a37d48 | 2035 | /* Add ourselves to objfile event chain. */ |
c90e7d63 | 2036 | gdb::observers::new_objfile.attach (thread_db_new_objfile, "linux-thread-db"); |
0838fb57 DE |
2037 | |
2038 | /* Add ourselves to inferior_created event chain. | |
2039 | This is needed to handle debugging statically linked programs where | |
2040 | the new_objfile observer won't get called for libpthread. */ | |
c90e7d63 SM |
2041 | gdb::observers::inferior_created.attach (thread_db_inferior_created, |
2042 | "linux-thread-db"); | |
fb0e1ba7 | 2043 | } |