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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
4a94e368 | 3 | Copyright (C) 1999-2022 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; | |
c80e29db | 105 | ptid_t get_ada_task_ptid (long lwp, ULONGEST thread) override; |
f6ac5f3d PA |
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 | ||
e0700ba4 | 113 | static std::string libthread_db_search_path = LIBTHREAD_DB_SEARCH_PATH; |
17a37d48 | 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 | { | |
6cb06a8c TT |
129 | gdb_printf (file, _("Auto-loading of inferior specific libthread_db " |
130 | "is %s.\n"), | |
131 | value); | |
bf88dd68 JK |
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 | { | |
e0700ba4 SM |
138 | if (libthread_db_search_path.empty ()) |
139 | libthread_db_search_path = LIBTHREAD_DB_SEARCH_PATH; | |
84e578fb DE |
140 | } |
141 | ||
02d868e8 PP |
142 | /* If non-zero, print details of libthread_db processing. */ |
143 | ||
ccce17b0 | 144 | static unsigned int libthread_db_debug; |
02d868e8 PP |
145 | |
146 | static void | |
147 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
148 | struct cmd_list_element *c, const char *value) | |
149 | { | |
6cb06a8c | 150 | gdb_printf (file, _("libthread-db debugging is %s.\n"), value); |
02d868e8 PP |
151 | } |
152 | ||
8605d56e AC |
153 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
154 | threads. */ | |
fb0e1ba7 | 155 | |
fb0e1ba7 | 156 | /* This module's target vector. */ |
f6ac5f3d | 157 | static thread_db_target the_thread_db_target; |
fb0e1ba7 | 158 | |
fb0e1ba7 MK |
159 | /* Non-zero if we have determined the signals used by the threads |
160 | library. */ | |
161 | static int thread_signals; | |
fb0e1ba7 | 162 | |
d90e17a7 PA |
163 | struct thread_db_info |
164 | { | |
165 | struct thread_db_info *next; | |
166 | ||
5b6d1e4f PA |
167 | /* The target this thread_db_info is bound to. */ |
168 | process_stratum_target *process_target; | |
169 | ||
d90e17a7 PA |
170 | /* Process id this object refers to. */ |
171 | int pid; | |
172 | ||
173 | /* Handle from dlopen for libthread_db.so. */ | |
174 | void *handle; | |
175 | ||
bf88dd68 JK |
176 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
177 | HANDLE. It may be NULL for system library. */ | |
178 | char *filename; | |
179 | ||
d90e17a7 PA |
180 | /* Structure that identifies the child process for the |
181 | <proc_service.h> interface. */ | |
182 | struct ps_prochandle proc_handle; | |
183 | ||
184 | /* Connection to the libthread_db library. */ | |
185 | td_thragent_t *thread_agent; | |
186 | ||
4d062f1a PA |
187 | /* True if we need to apply the workaround for glibc/BZ5983. When |
188 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
189 | list, nptl_db returns the parent's threads in addition to the new | |
190 | (single) child thread. If this flag is set, we do extra work to | |
191 | be able to ignore such stale entries. */ | |
192 | int need_stale_parent_threads_check; | |
193 | ||
d90e17a7 | 194 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 195 | |
96e9210f PA |
196 | td_init_ftype *td_init_p; |
197 | td_ta_new_ftype *td_ta_new_p; | |
a2419b98 | 198 | td_ta_delete_ftype *td_ta_delete_p; |
96e9210f PA |
199 | td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p; |
200 | td_ta_thr_iter_ftype *td_ta_thr_iter_p; | |
96e9210f | 201 | td_thr_get_info_ftype *td_thr_get_info_p; |
96e9210f PA |
202 | td_thr_tls_get_addr_ftype *td_thr_tls_get_addr_p; |
203 | td_thr_tlsbase_ftype *td_thr_tlsbase_p; | |
d90e17a7 PA |
204 | }; |
205 | ||
206 | /* List of known processes using thread_db, and the required | |
207 | bookkeeping. */ | |
6bd434d6 | 208 | static thread_db_info *thread_db_list; |
d90e17a7 | 209 | |
00431a78 PA |
210 | static void thread_db_find_new_threads_1 (thread_info *stopped); |
211 | static void thread_db_find_new_threads_2 (thread_info *stopped, | |
212 | bool until_no_new); | |
d90e17a7 | 213 | |
2db9a427 PA |
214 | static void check_thread_signals (void); |
215 | ||
be550b6e DE |
216 | static struct thread_info *record_thread |
217 | (struct thread_db_info *info, struct thread_info *tp, | |
218 | ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p); | |
2db9a427 | 219 | |
d90e17a7 PA |
220 | /* Add the current inferior to the list of processes using libpthread. |
221 | Return a pointer to the newly allocated object that was added to | |
222 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
223 | LIBTHREAD_DB_SO. */ | |
224 | ||
225 | static struct thread_db_info * | |
226 | add_thread_db_info (void *handle) | |
227 | { | |
8d749320 | 228 | struct thread_db_info *info = XCNEW (struct thread_db_info); |
d90e17a7 | 229 | |
5b6d1e4f | 230 | info->process_target = current_inferior ()->process_target (); |
e99b03dc | 231 | info->pid = inferior_ptid.pid (); |
d90e17a7 | 232 | info->handle = handle; |
856d6f99 PA |
233 | |
234 | /* The workaround works by reading from /proc/pid/status, so it is | |
235 | disabled for core files. */ | |
55f6301a | 236 | if (target_has_execution ()) |
856d6f99 | 237 | info->need_stale_parent_threads_check = 1; |
d90e17a7 PA |
238 | |
239 | info->next = thread_db_list; | |
240 | thread_db_list = info; | |
241 | ||
242 | return info; | |
243 | } | |
244 | ||
245 | /* Return the thread_db_info object representing the bookkeeping | |
246 | related to process PID, if any; NULL otherwise. */ | |
247 | ||
248 | static struct thread_db_info * | |
5b6d1e4f | 249 | get_thread_db_info (process_stratum_target *targ, int pid) |
d90e17a7 PA |
250 | { |
251 | struct thread_db_info *info; | |
252 | ||
253 | for (info = thread_db_list; info; info = info->next) | |
5b6d1e4f | 254 | if (targ == info->process_target && pid == info->pid) |
d90e17a7 PA |
255 | return info; |
256 | ||
257 | return NULL; | |
258 | } | |
259 | ||
a2419b98 PW |
260 | static const char *thread_db_err_str (td_err_e err); |
261 | ||
d90e17a7 PA |
262 | /* When PID has exited or has been detached, we no longer want to keep |
263 | track of it as using libpthread. Call this function to discard | |
264 | thread_db related info related to PID. Note that this closes | |
265 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
266 | ||
267 | static void | |
5b6d1e4f | 268 | delete_thread_db_info (process_stratum_target *targ, int pid) |
d90e17a7 PA |
269 | { |
270 | struct thread_db_info *info, *info_prev; | |
271 | ||
272 | info_prev = NULL; | |
273 | ||
274 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
5b6d1e4f | 275 | if (targ == info->process_target && pid == info->pid) |
d90e17a7 PA |
276 | break; |
277 | ||
278 | if (info == NULL) | |
279 | return; | |
280 | ||
a2419b98 PW |
281 | if (info->thread_agent != NULL && info->td_ta_delete_p != NULL) |
282 | { | |
283 | td_err_e err = info->td_ta_delete_p (info->thread_agent); | |
284 | ||
285 | if (err != TD_OK) | |
286 | warning (_("Cannot deregister process %d from libthread_db: %s"), | |
287 | pid, thread_db_err_str (err)); | |
288 | info->thread_agent = NULL; | |
289 | } | |
290 | ||
d90e17a7 PA |
291 | if (info->handle != NULL) |
292 | dlclose (info->handle); | |
293 | ||
bf88dd68 JK |
294 | xfree (info->filename); |
295 | ||
d90e17a7 PA |
296 | if (info_prev) |
297 | info_prev->next = info->next; | |
298 | else | |
299 | thread_db_list = info->next; | |
300 | ||
301 | xfree (info); | |
302 | } | |
fb0e1ba7 | 303 | |
5365276c DJ |
304 | /* Use "struct private_thread_info" to cache thread state. This is |
305 | a substantial optimization. */ | |
306 | ||
7aabaf9d | 307 | struct thread_db_thread_info : public private_thread_info |
fb0e1ba7 | 308 | { |
a2f23071 | 309 | /* Flag set when we see a TD_DEATH event for this thread. */ |
7aabaf9d | 310 | bool dying = false; |
a2f23071 | 311 | |
5365276c | 312 | /* Cached thread state. */ |
7aabaf9d SM |
313 | td_thrhandle_t th {}; |
314 | thread_t tid {}; | |
fb0e1ba7 | 315 | }; |
7aabaf9d SM |
316 | |
317 | static thread_db_thread_info * | |
318 | get_thread_db_thread_info (thread_info *thread) | |
319 | { | |
320 | return static_cast<thread_db_thread_info *> (thread->priv.get ()); | |
321 | } | |
21bf60fe | 322 | |
a121b7c1 | 323 | static const char * |
fb0e1ba7 MK |
324 | thread_db_err_str (td_err_e err) |
325 | { | |
326 | static char buf[64]; | |
327 | ||
328 | switch (err) | |
329 | { | |
330 | case TD_OK: | |
331 | return "generic 'call succeeded'"; | |
332 | case TD_ERR: | |
333 | return "generic error"; | |
334 | case TD_NOTHR: | |
335 | return "no thread to satisfy query"; | |
336 | case TD_NOSV: | |
337 | return "no sync handle to satisfy query"; | |
338 | case TD_NOLWP: | |
339 | return "no LWP to satisfy query"; | |
340 | case TD_BADPH: | |
341 | return "invalid process handle"; | |
342 | case TD_BADTH: | |
343 | return "invalid thread handle"; | |
344 | case TD_BADSH: | |
345 | return "invalid synchronization handle"; | |
346 | case TD_BADTA: | |
347 | return "invalid thread agent"; | |
348 | case TD_BADKEY: | |
349 | return "invalid key"; | |
350 | case TD_NOMSG: | |
351 | return "no event message for getmsg"; | |
352 | case TD_NOFPREGS: | |
353 | return "FPU register set not available"; | |
354 | case TD_NOLIBTHREAD: | |
355 | return "application not linked with libthread"; | |
356 | case TD_NOEVENT: | |
357 | return "requested event is not supported"; | |
358 | case TD_NOCAPAB: | |
359 | return "capability not available"; | |
360 | case TD_DBERR: | |
361 | return "debugger service failed"; | |
362 | case TD_NOAPLIC: | |
363 | return "operation not applicable to"; | |
364 | case TD_NOTSD: | |
365 | return "no thread-specific data for this thread"; | |
366 | case TD_MALLOC: | |
367 | return "malloc failed"; | |
368 | case TD_PARTIALREG: | |
369 | return "only part of register set was written/read"; | |
370 | case TD_NOXREGS: | |
371 | return "X register set not available for this thread"; | |
59f80f10 DJ |
372 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
373 | case TD_NOTALLOC: | |
374 | return "thread has not yet allocated TLS for given module"; | |
375 | #endif | |
376 | #ifdef THREAD_DB_HAS_TD_VERSION | |
377 | case TD_VERSION: | |
378 | return "versions of libpthread and libthread_db do not match"; | |
379 | #endif | |
380 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
381 | case TD_NOTLS: | |
382 | return "there is no TLS segment in the given module"; | |
383 | #endif | |
fb0e1ba7 MK |
384 | default: |
385 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
386 | return buf; | |
387 | } | |
388 | } | |
4105de34 | 389 | |
00431a78 PA |
390 | /* Fetch the user-level thread id of PTID. STOPPED is a stopped |
391 | thread that we can use to access memory. */ | |
fb0e1ba7 | 392 | |
be550b6e | 393 | static struct thread_info * |
00431a78 | 394 | thread_from_lwp (thread_info *stopped, ptid_t ptid) |
fb0e1ba7 | 395 | { |
fb0e1ba7 | 396 | td_thrhandle_t th; |
2db9a427 | 397 | td_thrinfo_t ti; |
fb0e1ba7 | 398 | td_err_e err; |
d90e17a7 | 399 | struct thread_db_info *info; |
2db9a427 | 400 | struct thread_info *tp; |
fb0e1ba7 | 401 | |
6cb9b55b PP |
402 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
403 | th.th_unique = 0; | |
404 | ||
17faa917 DJ |
405 | /* This ptid comes from linux-nat.c, which should always fill in the |
406 | LWP. */ | |
e38504b3 | 407 | gdb_assert (ptid.lwp () != 0); |
fb0e1ba7 | 408 | |
5b6d1e4f | 409 | info = get_thread_db_info (stopped->inf->process_target (), ptid.pid ()); |
d90e17a7 | 410 | |
4c28f408 | 411 | /* Access an lwp we know is stopped. */ |
00431a78 | 412 | info->proc_handle.thread = stopped; |
e38504b3 | 413 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid.lwp (), |
dfd4cc63 | 414 | &th); |
fb0e1ba7 | 415 | if (err != TD_OK) |
8a3fe4f8 | 416 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
e38504b3 | 417 | ptid.lwp (), thread_db_err_str (err)); |
fb0e1ba7 | 418 | |
2db9a427 PA |
419 | err = info->td_thr_get_info_p (&th, &ti); |
420 | if (err != TD_OK) | |
421 | error (_("thread_get_info_callback: cannot get thread info: %s"), | |
422 | thread_db_err_str (err)); | |
423 | ||
424 | /* Fill the cache. */ | |
5b6d1e4f | 425 | tp = find_thread_ptid (stopped->inf->process_target (), ptid); |
be550b6e | 426 | return record_thread (info, tp, ptid, &th, &ti); |
fb0e1ba7 MK |
427 | } |
428 | \f | |
429 | ||
2db9a427 PA |
430 | /* See linux-nat.h. */ |
431 | ||
4c28f408 | 432 | int |
2db9a427 | 433 | thread_db_notice_clone (ptid_t parent, ptid_t child) |
4c28f408 | 434 | { |
d90e17a7 | 435 | struct thread_db_info *info; |
4c28f408 | 436 | |
5b6d1e4f | 437 | info = get_thread_db_info (linux_target, child.pid ()); |
d90e17a7 PA |
438 | |
439 | if (info == NULL) | |
4c28f408 PA |
440 | return 0; |
441 | ||
5b6d1e4f | 442 | thread_info *stopped = find_thread_ptid (linux_target, parent); |
4c28f408 | 443 | |
00431a78 PA |
444 | thread_from_lwp (stopped, child); |
445 | ||
446 | /* If we do not know about the main thread's pthread info yet, this | |
447 | would be a good time to find it. */ | |
448 | thread_from_lwp (stopped, parent); | |
4c28f408 PA |
449 | return 1; |
450 | } | |
451 | ||
5220ea4c AC |
452 | static void * |
453 | verbose_dlsym (void *handle, const char *name) | |
454 | { | |
455 | void *sym = dlsym (handle, name); | |
456 | if (sym == NULL) | |
3e43a32a MS |
457 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
458 | name, dlerror ()); | |
5220ea4c AC |
459 | return sym; |
460 | } | |
461 | ||
fcb44371 JK |
462 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
463 | return 1 if this version is lower (and not equal) to | |
464 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
465 | ||
466 | static int | |
467 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
468 | { | |
3b7344d5 | 469 | struct bound_minimal_symbol version_msym; |
fcb44371 | 470 | CORE_ADDR version_addr; |
66920317 | 471 | int got, retval = 0; |
fcb44371 JK |
472 | |
473 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 474 | if (version_msym.minsym == NULL) |
fcb44371 JK |
475 | return 0; |
476 | ||
77e371c0 | 477 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
66920317 TT |
478 | gdb::unique_xmalloc_ptr<char> version |
479 | = target_read_string (version_addr, 32, &got); | |
480 | if (version != nullptr | |
481 | && memchr (version.get (), 0, got) == version.get () + got - 1) | |
fcb44371 JK |
482 | { |
483 | int major, minor; | |
484 | ||
e83e4e24 | 485 | retval = (sscanf (version.get (), "%d.%d", &major, &minor) == 2 |
fcb44371 JK |
486 | && (major < ver_major_min |
487 | || (major == ver_major_min && minor < ver_minor_min))); | |
488 | } | |
fcb44371 JK |
489 | |
490 | return retval; | |
491 | } | |
492 | ||
fcb44371 JK |
493 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
494 | if appropriate. | |
456b0e24 | 495 | |
fcb44371 JK |
496 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
497 | otherwise. */ | |
498 | ||
499 | static int | |
00431a78 | 500 | thread_db_find_new_threads_silently (thread_info *stopped) |
456b0e24 | 501 | { |
456b0e24 | 502 | |
a70b8144 | 503 | try |
456b0e24 | 504 | { |
00431a78 | 505 | thread_db_find_new_threads_2 (stopped, true); |
456b0e24 PP |
506 | } |
507 | ||
230d2906 | 508 | catch (const gdb_exception_error &except) |
e0881a8e | 509 | { |
fcb44371 | 510 | if (libthread_db_debug) |
883ed13e | 511 | exception_fprintf (gdb_stdlog, except, |
fcb44371 JK |
512 | "Warning: thread_db_find_new_threads_silently: "); |
513 | ||
514 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
515 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
516 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
517 | executables if td_thr_get_info is called before glibc has initialized | |
518 | itself. | |
519 | ||
520 | If the nptl bug is NOT present in the inferior and still thread_db | |
521 | reports an error return 1. It means the inferior has corrupted thread | |
522 | list and GDB should fall back only to LWPs. | |
523 | ||
524 | If the nptl bug is present in the inferior return 0 to silently ignore | |
525 | such errors, and let gdb enumerate threads again later. In such case | |
526 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
527 | corrupted. For core files it does not apply, no 'later enumeration' |
528 | is possible. */ | |
fcb44371 | 529 | |
55f6301a | 530 | if (!target_has_execution () || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
531 | { |
532 | exception_fprintf (gdb_stderr, except, | |
533 | _("Warning: couldn't activate thread debugging " | |
534 | "using libthread_db: ")); | |
535 | return 1; | |
536 | } | |
e0881a8e | 537 | } |
492d29ea | 538 | |
fcb44371 | 539 | return 0; |
456b0e24 PP |
540 | } |
541 | ||
d90e17a7 PA |
542 | /* Lookup a library in which given symbol resides. |
543 | Note: this is looking in GDB process, not in the inferior. | |
544 | Returns library name, or NULL. */ | |
545 | ||
546 | static const char * | |
547 | dladdr_to_soname (const void *addr) | |
548 | { | |
549 | Dl_info info; | |
550 | ||
551 | if (dladdr (addr, &info) != 0) | |
552 | return info.dli_fname; | |
553 | return NULL; | |
554 | } | |
555 | ||
5045b3d7 GB |
556 | /* State for check_thread_db_callback. */ |
557 | ||
558 | struct check_thread_db_info | |
559 | { | |
560 | /* The libthread_db under test. */ | |
561 | struct thread_db_info *info; | |
562 | ||
563 | /* True if progress should be logged. */ | |
564 | bool log_progress; | |
565 | ||
566 | /* True if the callback was called. */ | |
567 | bool threads_seen; | |
568 | ||
569 | /* Name of last libthread_db function called. */ | |
570 | const char *last_call; | |
571 | ||
572 | /* Value returned by last libthread_db call. */ | |
573 | td_err_e last_result; | |
574 | }; | |
575 | ||
576 | static struct check_thread_db_info *tdb_testinfo; | |
577 | ||
578 | /* Callback for check_thread_db. */ | |
579 | ||
580 | static int | |
581 | check_thread_db_callback (const td_thrhandle_t *th, void *arg) | |
582 | { | |
583 | gdb_assert (tdb_testinfo != NULL); | |
584 | tdb_testinfo->threads_seen = true; | |
585 | ||
586 | #define LOG(fmt, args...) \ | |
587 | do \ | |
588 | { \ | |
589 | if (tdb_testinfo->log_progress) \ | |
590 | { \ | |
591 | debug_printf (fmt, ## args); \ | |
592 | gdb_flush (gdb_stdlog); \ | |
593 | } \ | |
594 | } \ | |
595 | while (0) | |
596 | ||
597 | #define CHECK_1(expr, args...) \ | |
598 | do \ | |
599 | { \ | |
600 | if (!(expr)) \ | |
601 | { \ | |
602 | LOG (" ... FAIL!\n"); \ | |
603 | error (args); \ | |
604 | } \ | |
605 | } \ | |
606 | while (0) | |
607 | ||
608 | #define CHECK(expr) \ | |
609 | CHECK_1 (expr, "(%s) == false", #expr) | |
610 | ||
611 | #define CALL_UNCHECKED(func, args...) \ | |
612 | do \ | |
613 | { \ | |
614 | tdb_testinfo->last_call = #func; \ | |
615 | tdb_testinfo->last_result \ | |
616 | = tdb_testinfo->info->func ## _p (args); \ | |
617 | } \ | |
618 | while (0) | |
619 | ||
620 | #define CHECK_CALL() \ | |
621 | CHECK_1 (tdb_testinfo->last_result == TD_OK, \ | |
622 | _("%s failed: %s"), \ | |
623 | tdb_testinfo->last_call, \ | |
624 | thread_db_err_str (tdb_testinfo->last_result)) \ | |
625 | ||
626 | #define CALL(func, args...) \ | |
627 | do \ | |
628 | { \ | |
629 | CALL_UNCHECKED (func, args); \ | |
630 | CHECK_CALL (); \ | |
631 | } \ | |
632 | while (0) | |
633 | ||
634 | LOG (" Got thread"); | |
635 | ||
636 | /* Check td_ta_thr_iter passed consistent arguments. */ | |
637 | CHECK (th != NULL); | |
638 | CHECK (arg == (void *) tdb_testinfo); | |
639 | CHECK (th->th_ta_p == tdb_testinfo->info->thread_agent); | |
640 | ||
641 | LOG (" %s", core_addr_to_string_nz ((CORE_ADDR) th->th_unique)); | |
642 | ||
643 | /* Check td_thr_get_info. */ | |
644 | td_thrinfo_t ti; | |
645 | CALL (td_thr_get_info, th, &ti); | |
646 | ||
647 | LOG (" => %d", ti.ti_lid); | |
648 | ||
649 | CHECK (ti.ti_ta_p == th->th_ta_p); | |
650 | CHECK (ti.ti_tid == (thread_t) th->th_unique); | |
651 | ||
652 | /* Check td_ta_map_lwp2thr. */ | |
653 | td_thrhandle_t th2; | |
654 | memset (&th2, 23, sizeof (td_thrhandle_t)); | |
655 | CALL_UNCHECKED (td_ta_map_lwp2thr, th->th_ta_p, ti.ti_lid, &th2); | |
656 | ||
55f6301a | 657 | if (tdb_testinfo->last_result == TD_ERR && !target_has_execution ()) |
5045b3d7 GB |
658 | { |
659 | /* Some platforms require execution for td_ta_map_lwp2thr. */ | |
660 | LOG (_("; can't map_lwp2thr")); | |
661 | } | |
662 | else | |
663 | { | |
664 | CHECK_CALL (); | |
665 | ||
666 | LOG (" => %s", core_addr_to_string_nz ((CORE_ADDR) th2.th_unique)); | |
667 | ||
668 | CHECK (memcmp (th, &th2, sizeof (td_thrhandle_t)) == 0); | |
669 | } | |
670 | ||
671 | /* Attempt TLS access. Assuming errno is TLS, this calls | |
672 | thread_db_get_thread_local_address, which in turn calls | |
673 | td_thr_tls_get_addr for live inferiors or td_thr_tlsbase | |
674 | for core files. This test is skipped if the thread has | |
675 | not been recorded; proceeding in that case would result | |
676 | in the test having the side-effect of noticing threads | |
677 | which seems wrong. | |
678 | ||
679 | Note that in glibc's libthread_db td_thr_tls_get_addr is | |
680 | a thin wrapper around td_thr_tlsbase; this check always | |
681 | hits the bulk of the code. | |
682 | ||
683 | Note also that we don't actually check any libthread_db | |
684 | calls are made, we just assume they were; future changes | |
685 | to how GDB accesses TLS could result in this passing | |
686 | without exercising the calls it's supposed to. */ | |
184ea2f7 | 687 | ptid_t ptid = ptid_t (tdb_testinfo->info->pid, ti.ti_lid); |
5b6d1e4f | 688 | thread_info *thread_info = find_thread_ptid (linux_target, ptid); |
5045b3d7 GB |
689 | if (thread_info != NULL && thread_info->priv != NULL) |
690 | { | |
691 | LOG ("; errno"); | |
692 | ||
693 | scoped_restore_current_thread restore_current_thread; | |
5b6d1e4f | 694 | switch_to_thread (thread_info); |
5045b3d7 GB |
695 | |
696 | expression_up expr = parse_expression ("(int) errno"); | |
697 | struct value *val = evaluate_expression (expr.get ()); | |
698 | ||
699 | if (tdb_testinfo->log_progress) | |
700 | { | |
701 | struct value_print_options opts; | |
702 | ||
703 | get_user_print_options (&opts); | |
704 | LOG (" = "); | |
705 | value_print (val, gdb_stdlog, &opts); | |
706 | } | |
707 | } | |
708 | ||
709 | LOG (" ... OK\n"); | |
710 | ||
711 | #undef LOG | |
712 | #undef CHECK_1 | |
713 | #undef CHECK | |
714 | #undef CALL_UNCHECKED | |
715 | #undef CHECK_CALL | |
716 | #undef CALL | |
717 | ||
718 | return 0; | |
719 | } | |
720 | ||
721 | /* Run integrity checks on the dlopen()ed libthread_db described by | |
722 | INFO. Returns true on success, displays a warning and returns | |
723 | false on failure. Logs progress messages to gdb_stdlog during | |
724 | the test if LOG_PROGRESS is true. */ | |
725 | ||
726 | static bool | |
727 | check_thread_db (struct thread_db_info *info, bool log_progress) | |
728 | { | |
729 | bool test_passed = true; | |
730 | ||
731 | if (log_progress) | |
732 | debug_printf (_("Running libthread_db integrity checks:\n")); | |
733 | ||
734 | /* GDB avoids using td_ta_thr_iter wherever possible (see comment | |
735 | in try_thread_db_load_1 below) so in order to test it we may | |
736 | have to locate it ourselves. */ | |
737 | td_ta_thr_iter_ftype *td_ta_thr_iter_p = info->td_ta_thr_iter_p; | |
738 | if (td_ta_thr_iter_p == NULL) | |
739 | { | |
740 | void *thr_iter = verbose_dlsym (info->handle, "td_ta_thr_iter"); | |
741 | if (thr_iter == NULL) | |
742 | return 0; | |
743 | ||
744 | td_ta_thr_iter_p = (td_ta_thr_iter_ftype *) thr_iter; | |
745 | } | |
746 | ||
747 | /* Set up the test state we share with the callback. */ | |
748 | gdb_assert (tdb_testinfo == NULL); | |
749 | struct check_thread_db_info tdb_testinfo_buf; | |
750 | tdb_testinfo = &tdb_testinfo_buf; | |
751 | ||
752 | memset (tdb_testinfo, 0, sizeof (struct check_thread_db_info)); | |
753 | tdb_testinfo->info = info; | |
754 | tdb_testinfo->log_progress = log_progress; | |
755 | ||
756 | /* td_ta_thr_iter shouldn't be used on running processes. Note that | |
757 | it's possible the inferior will stop midway through modifying one | |
758 | of its thread lists, in which case the check will spuriously | |
759 | fail. */ | |
760 | linux_stop_and_wait_all_lwps (); | |
761 | ||
a70b8144 | 762 | try |
5045b3d7 GB |
763 | { |
764 | td_err_e err = td_ta_thr_iter_p (info->thread_agent, | |
765 | check_thread_db_callback, | |
766 | tdb_testinfo, | |
767 | TD_THR_ANY_STATE, | |
768 | TD_THR_LOWEST_PRIORITY, | |
769 | TD_SIGNO_MASK, | |
770 | TD_THR_ANY_USER_FLAGS); | |
771 | ||
772 | if (err != TD_OK) | |
773 | error (_("td_ta_thr_iter failed: %s"), thread_db_err_str (err)); | |
774 | ||
775 | if (!tdb_testinfo->threads_seen) | |
776 | error (_("no threads seen")); | |
777 | } | |
230d2906 | 778 | catch (const gdb_exception_error &except) |
5045b3d7 GB |
779 | { |
780 | if (warning_pre_print) | |
0426ad51 | 781 | gdb_puts (warning_pre_print, gdb_stderr); |
5045b3d7 GB |
782 | |
783 | exception_fprintf (gdb_stderr, except, | |
784 | _("libthread_db integrity checks failed: ")); | |
785 | ||
786 | test_passed = false; | |
787 | } | |
5045b3d7 GB |
788 | |
789 | if (test_passed && log_progress) | |
790 | debug_printf (_("libthread_db integrity checks passed.\n")); | |
791 | ||
792 | tdb_testinfo = NULL; | |
793 | ||
794 | linux_unstop_all_lwps (); | |
795 | ||
796 | return test_passed; | |
797 | } | |
798 | ||
e2b9ea4b KB |
799 | /* Predicate which tests whether objfile OBJ refers to the library |
800 | containing pthread related symbols. Historically, this library has | |
801 | been named in such a way that looking for "libpthread" in the name | |
802 | was sufficient to identify it. As of glibc-2.34, the C library | |
803 | (libc) contains the thread library symbols. Therefore we check | |
804 | that the name matches a possible thread library, but we also check | |
805 | that it contains at least one of the symbols (pthread_create) that | |
806 | we'd expect to find in the thread library. */ | |
807 | ||
808 | static bool | |
809 | libpthread_objfile_p (objfile *obj) | |
810 | { | |
811 | return (libpthread_name_p (objfile_name (obj)) | |
812 | && lookup_minimal_symbol ("pthread_create", | |
813 | NULL, | |
814 | obj).minsym != NULL); | |
815 | } | |
816 | ||
2471d008 | 817 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
9ddc1af1 | 818 | Return true on success. |
17a37d48 PP |
819 | Failure could happen if libthread_db does not have symbols we expect, |
820 | or when it refuses to work with the current inferior (e.g. due to | |
821 | version mismatch between libthread_db and libpthread). */ | |
822 | ||
9ddc1af1 | 823 | static bool |
d90e17a7 | 824 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
825 | { |
826 | td_err_e err; | |
827 | ||
828 | /* Initialize pointers to the dynamic library functions we will use. | |
829 | Essential functions first. */ | |
830 | ||
96e9210f PA |
831 | #define TDB_VERBOSE_DLSYM(info, func) \ |
832 | info->func ## _p = (func ## _ftype *) verbose_dlsym (info->handle, #func) | |
833 | ||
834 | #define TDB_DLSYM(info, func) \ | |
835 | info->func ## _p = (func ## _ftype *) dlsym (info->handle, #func) | |
836 | ||
837 | #define CHK(a) \ | |
838 | do \ | |
839 | { \ | |
840 | if ((a) == NULL) \ | |
9ddc1af1 | 841 | return false; \ |
96e9210f PA |
842 | } while (0) |
843 | ||
844 | CHK (TDB_VERBOSE_DLSYM (info, td_init)); | |
17a37d48 | 845 | |
d90e17a7 | 846 | err = info->td_init_p (); |
17a37d48 PP |
847 | if (err != TD_OK) |
848 | { | |
3e43a32a MS |
849 | warning (_("Cannot initialize libthread_db: %s"), |
850 | thread_db_err_str (err)); | |
9ddc1af1 | 851 | return false; |
17a37d48 PP |
852 | } |
853 | ||
96e9210f | 854 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_new)); |
17a37d48 PP |
855 | |
856 | /* Initialize the structure that identifies the child process. */ | |
00431a78 | 857 | info->proc_handle.thread = inferior_thread (); |
17a37d48 PP |
858 | |
859 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 860 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
861 | if (err != TD_OK) |
862 | { | |
02d868e8 | 863 | if (libthread_db_debug) |
6cb06a8c TT |
864 | gdb_printf (gdb_stdlog, _("td_ta_new failed: %s\n"), |
865 | thread_db_err_str (err)); | |
17a37d48 | 866 | else |
dda83cd7 SM |
867 | switch (err) |
868 | { | |
869 | case TD_NOLIBTHREAD: | |
17a37d48 | 870 | #ifdef THREAD_DB_HAS_TD_VERSION |
dda83cd7 | 871 | case TD_VERSION: |
17a37d48 | 872 | #endif |
dda83cd7 SM |
873 | /* The errors above are not unexpected and silently ignored: |
874 | they just mean we haven't found correct version of | |
875 | libthread_db yet. */ | |
876 | break; | |
877 | default: | |
878 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
879 | } | |
9ddc1af1 | 880 | return false; |
17a37d48 PP |
881 | } |
882 | ||
96e9210f PA |
883 | /* These are essential. */ |
884 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_map_lwp2thr)); | |
96e9210f | 885 | CHK (TDB_VERBOSE_DLSYM (info, td_thr_get_info)); |
17a37d48 PP |
886 | |
887 | /* These are not essential. */ | |
96e9210f PA |
888 | TDB_DLSYM (info, td_thr_tls_get_addr); |
889 | TDB_DLSYM (info, td_thr_tlsbase); | |
a2419b98 | 890 | TDB_DLSYM (info, td_ta_delete); |
96e9210f | 891 | |
2db9a427 PA |
892 | /* It's best to avoid td_ta_thr_iter if possible. That walks data |
893 | structures in the inferior's address space that may be corrupted, | |
894 | or, if the target is running, may change while we walk them. If | |
895 | there's execution (and /proc is mounted), then we're already | |
896 | attached to all LWPs. Use thread_from_lwp, which uses | |
897 | td_ta_map_lwp2thr instead, which does not walk the thread list. | |
898 | ||
899 | td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that | |
900 | currently on core targets, as it uses ptrace directly. */ | |
55f6301a | 901 | if (target_has_execution () |
e99b03dc | 902 | && linux_proc_task_list_dir_exists (inferior_ptid.pid ())) |
1eb2dbb8 PA |
903 | info->td_ta_thr_iter_p = NULL; |
904 | else | |
905 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter)); | |
906 | ||
907 | #undef TDB_VERBOSE_DLSYM | |
908 | #undef TDB_DLSYM | |
909 | #undef CHK | |
910 | ||
5045b3d7 GB |
911 | /* Run integrity checks if requested. */ |
912 | if (check_thread_db_on_load) | |
913 | { | |
914 | if (!check_thread_db (info, libthread_db_debug)) | |
9ddc1af1 | 915 | return false; |
5045b3d7 GB |
916 | } |
917 | ||
1eb2dbb8 | 918 | if (info->td_ta_thr_iter_p == NULL) |
2db9a427 | 919 | { |
e99b03dc | 920 | int pid = inferior_ptid.pid (); |
00431a78 | 921 | thread_info *curr_thread = inferior_thread (); |
2db9a427 PA |
922 | |
923 | linux_stop_and_wait_all_lwps (); | |
924 | ||
901b9821 | 925 | for (const lwp_info *lp : all_lwps ()) |
e99b03dc | 926 | if (lp->ptid.pid () == pid) |
00431a78 | 927 | thread_from_lwp (curr_thread, lp->ptid); |
2db9a427 PA |
928 | |
929 | linux_unstop_all_lwps (); | |
930 | } | |
00431a78 | 931 | else if (thread_db_find_new_threads_silently (inferior_thread ()) != 0) |
fcb44371 JK |
932 | { |
933 | /* Even if libthread_db initializes, if the thread list is | |
dda83cd7 SM |
934 | corrupted, we'd not manage to list any threads. Better reject this |
935 | thread_db, and fall back to at least listing LWPs. */ | |
9ddc1af1 | 936 | return false; |
fcb44371 JK |
937 | } |
938 | ||
6cb06a8c | 939 | gdb_printf (_("[Thread debugging using libthread_db enabled]\n")); |
17a37d48 | 940 | |
e0700ba4 | 941 | if (!libthread_db_search_path.empty () || libthread_db_debug) |
d90e17a7 PA |
942 | { |
943 | const char *library; | |
17a37d48 | 944 | |
f8708a14 | 945 | library = dladdr_to_soname ((const void *) *info->td_ta_new_p); |
d90e17a7 PA |
946 | if (library == NULL) |
947 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 948 | |
6cb06a8c TT |
949 | gdb_printf (_("Using host libthread_db library \"%ps\".\n"), |
950 | styled_string (file_name_style.style (), library)); | |
d90e17a7 | 951 | } |
17a37d48 | 952 | |
d90e17a7 | 953 | /* The thread library was detected. Activate the thread_db target |
5b6d1e4f | 954 | for this process. */ |
02980c56 | 955 | current_inferior ()->push_target (&the_thread_db_target); |
9ddc1af1 | 956 | return true; |
17a37d48 PP |
957 | } |
958 | ||
959 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
960 | relative, or just LIBTHREAD_DB. */ | |
961 | ||
9ddc1af1 SM |
962 | static bool |
963 | try_thread_db_load (const char *library, bool check_auto_load_safe) | |
17a37d48 PP |
964 | { |
965 | void *handle; | |
d90e17a7 | 966 | struct thread_db_info *info; |
17a37d48 | 967 | |
02d868e8 | 968 | if (libthread_db_debug) |
6cb06a8c TT |
969 | gdb_printf (gdb_stdlog, |
970 | _("Trying host libthread_db library: %s.\n"), | |
971 | library); | |
fde4f8ed JK |
972 | |
973 | if (check_auto_load_safe) | |
974 | { | |
975 | if (access (library, R_OK) != 0) | |
976 | { | |
977 | /* Do not print warnings by file_is_auto_load_safe if the library does | |
978 | not exist at this place. */ | |
979 | if (libthread_db_debug) | |
6cb06a8c TT |
980 | gdb_printf (gdb_stdlog, _("open failed: %s.\n"), |
981 | safe_strerror (errno)); | |
9ddc1af1 | 982 | return false; |
fde4f8ed JK |
983 | } |
984 | ||
a59902a7 SM |
985 | auto_load_debug_printf |
986 | ("Loading libthread-db library \"%s\" from explicit directory.", | |
987 | library); | |
988 | ||
989 | if (!file_is_auto_load_safe (library)) | |
9ddc1af1 | 990 | return false; |
fde4f8ed JK |
991 | } |
992 | ||
17a37d48 PP |
993 | handle = dlopen (library, RTLD_NOW); |
994 | if (handle == NULL) | |
995 | { | |
02d868e8 | 996 | if (libthread_db_debug) |
6cb06a8c | 997 | gdb_printf (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ()); |
9ddc1af1 | 998 | return false; |
17a37d48 PP |
999 | } |
1000 | ||
02d868e8 | 1001 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
1002 | { |
1003 | void *td_init; | |
1004 | ||
1005 | td_init = dlsym (handle, "td_init"); | |
1006 | if (td_init != NULL) | |
dda83cd7 SM |
1007 | { |
1008 | const char *const libpath = dladdr_to_soname (td_init); | |
17a37d48 | 1009 | |
dda83cd7 | 1010 | if (libpath != NULL) |
6cb06a8c TT |
1011 | gdb_printf (gdb_stdlog, _("Host %s resolved to: %s.\n"), |
1012 | library, libpath); | |
dda83cd7 | 1013 | } |
17a37d48 PP |
1014 | } |
1015 | ||
d90e17a7 PA |
1016 | info = add_thread_db_info (handle); |
1017 | ||
bf88dd68 JK |
1018 | /* Do not save system library name, that one is always trusted. */ |
1019 | if (strchr (library, '/') != NULL) | |
14278e1f | 1020 | info->filename = gdb_realpath (library).release (); |
bf88dd68 | 1021 | |
122373f7 SM |
1022 | try |
1023 | { | |
1024 | if (try_thread_db_load_1 (info)) | |
1025 | return true; | |
1026 | } | |
1027 | catch (const gdb_exception_error &except) | |
1028 | { | |
1029 | if (libthread_db_debug) | |
1030 | exception_fprintf (gdb_stdlog, except, | |
1031 | "Warning: While trying to load libthread_db: "); | |
1032 | } | |
17a37d48 PP |
1033 | |
1034 | /* This library "refused" to work on current inferior. */ | |
5b6d1e4f PA |
1035 | delete_thread_db_info (current_inferior ()->process_target (), |
1036 | inferior_ptid.pid ()); | |
9ddc1af1 | 1037 | return false; |
17a37d48 PP |
1038 | } |
1039 | ||
290351b8 | 1040 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
1041 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
1042 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
1043 | The result is true for success. */ |
1044 | ||
9ddc1af1 | 1045 | static bool |
e6712ff1 | 1046 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 1047 | { |
4262abfb | 1048 | const char *obj_name = objfile_name (obj); |
290351b8 | 1049 | |
4262abfb | 1050 | if (obj_name[0] != '/') |
290351b8 DE |
1051 | { |
1052 | warning (_("Expected absolute pathname for libpthread in the" | |
9d636d67 TT |
1053 | " inferior, but got %ps."), |
1054 | styled_string (file_name_style.style (), obj_name)); | |
9ddc1af1 | 1055 | return false; |
290351b8 | 1056 | } |
05386e9e | 1057 | |
9b292f68 TT |
1058 | std::string path = obj_name; |
1059 | size_t cp = path.rfind ('/'); | |
05386e9e | 1060 | /* This should at minimum hit the first character. */ |
9b292f68 TT |
1061 | gdb_assert (cp != std::string::npos); |
1062 | path.resize (cp + 1); | |
e6712ff1 | 1063 | if (subdir != NULL) |
9b292f68 TT |
1064 | path = path + subdir + "/"; |
1065 | path += LIBTHREAD_DB_SO; | |
bccbefd2 | 1066 | |
9ddc1af1 | 1067 | return try_thread_db_load (path.c_str (), true); |
290351b8 DE |
1068 | } |
1069 | ||
98a5dd13 | 1070 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
1071 | Look for libthread_db in directory(libpthread)/SUBDIR. |
1072 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
1073 | The result is true for success. */ |
1074 | ||
9ddc1af1 | 1075 | static bool |
e6712ff1 | 1076 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 | 1077 | { |
bf88dd68 | 1078 | if (!auto_load_thread_db) |
9ddc1af1 | 1079 | return false; |
bf88dd68 | 1080 | |
2030c079 | 1081 | for (objfile *obj : current_program_space->objfiles ()) |
e2b9ea4b | 1082 | if (libpthread_objfile_p (obj)) |
98a5dd13 | 1083 | { |
e6712ff1 | 1084 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
9ddc1af1 | 1085 | return true; |
290351b8 DE |
1086 | |
1087 | /* We may have found the separate-debug-info version of | |
1088 | libpthread, and it may live in a directory without a matching | |
1089 | libthread_db. */ | |
1090 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
1091 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
1092 | subdir); | |
290351b8 | 1093 | |
9ddc1af1 | 1094 | return false; |
98a5dd13 DE |
1095 | } |
1096 | ||
9ddc1af1 | 1097 | return false; |
98a5dd13 DE |
1098 | } |
1099 | ||
1100 | /* Handle $sdir in libthread-db-search-path. | |
1101 | Look for libthread_db in the system dirs, or wherever a plain | |
1102 | dlopen(file_without_path) will look. | |
1103 | The result is true for success. */ | |
1104 | ||
9ddc1af1 | 1105 | static bool |
98a5dd13 DE |
1106 | try_thread_db_load_from_sdir (void) |
1107 | { | |
9ddc1af1 | 1108 | return try_thread_db_load (LIBTHREAD_DB_SO, false); |
98a5dd13 DE |
1109 | } |
1110 | ||
1111 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
1112 | The result is true for success. */ | |
1113 | ||
9ddc1af1 | 1114 | static bool |
98a5dd13 DE |
1115 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) |
1116 | { | |
bf88dd68 | 1117 | if (!auto_load_thread_db) |
9ddc1af1 | 1118 | return false; |
bf88dd68 | 1119 | |
9b292f68 | 1120 | std::string path = std::string (dir, dir_len) + "/" + LIBTHREAD_DB_SO; |
bccbefd2 | 1121 | |
9ddc1af1 | 1122 | return try_thread_db_load (path.c_str (), true); |
98a5dd13 DE |
1123 | } |
1124 | ||
17a37d48 | 1125 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
1126 | to work on current inferior. |
1127 | The result is true for success. */ | |
17a37d48 | 1128 | |
9ddc1af1 | 1129 | static bool |
17a37d48 PP |
1130 | thread_db_load_search (void) |
1131 | { | |
9ddc1af1 | 1132 | bool rc = false; |
17a37d48 | 1133 | |
e80aaf61 | 1134 | std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec |
e0700ba4 | 1135 | = dirnames_to_char_ptr_vec (libthread_db_search_path.c_str ()); |
e6712ff1 | 1136 | |
e80aaf61 | 1137 | for (const gdb::unique_xmalloc_ptr<char> &this_dir_up : dir_vec) |
17a37d48 | 1138 | { |
e80aaf61 | 1139 | const char *this_dir = this_dir_up.get (); |
e6712ff1 | 1140 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 1141 | size_t this_dir_len; |
e0881a8e | 1142 | |
e6712ff1 | 1143 | this_dir_len = strlen (this_dir); |
17a37d48 | 1144 | |
e6712ff1 DE |
1145 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
1146 | && (this_dir[pdir_len] == '\0' | |
1147 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 1148 | { |
9b292f68 | 1149 | const char *subdir = NULL; |
e6712ff1 | 1150 | |
9b292f68 | 1151 | std::string subdir_holder; |
e6712ff1 | 1152 | if (this_dir[pdir_len] == '/') |
98a5dd13 | 1153 | { |
9b292f68 TT |
1154 | subdir_holder = std::string (this_dir + pdir_len + 1); |
1155 | subdir = subdir_holder.c_str (); | |
98a5dd13 | 1156 | } |
e6712ff1 | 1157 | rc = try_thread_db_load_from_pdir (subdir); |
e6712ff1 DE |
1158 | if (rc) |
1159 | break; | |
17a37d48 | 1160 | } |
e6712ff1 | 1161 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
1162 | { |
1163 | if (try_thread_db_load_from_sdir ()) | |
1164 | { | |
1165 | rc = 1; | |
1166 | break; | |
1167 | } | |
1168 | } | |
1169 | else | |
17a37d48 | 1170 | { |
98a5dd13 DE |
1171 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
1172 | { | |
1173 | rc = 1; | |
1174 | break; | |
1175 | } | |
17a37d48 PP |
1176 | } |
1177 | } | |
98a5dd13 DE |
1178 | |
1179 | if (libthread_db_debug) | |
6cb06a8c TT |
1180 | gdb_printf (gdb_stdlog, |
1181 | _("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1182 | return rc; |
1183 | } | |
1184 | ||
9ddc1af1 | 1185 | /* Return true if the inferior has a libpthread. */ |
98a5dd13 | 1186 | |
9ddc1af1 | 1187 | static bool |
98a5dd13 DE |
1188 | has_libpthread (void) |
1189 | { | |
2030c079 | 1190 | for (objfile *obj : current_program_space->objfiles ()) |
e2b9ea4b | 1191 | if (libpthread_objfile_p (obj)) |
9ddc1af1 | 1192 | return true; |
98a5dd13 | 1193 | |
9ddc1af1 | 1194 | return false; |
98a5dd13 DE |
1195 | } |
1196 | ||
17a37d48 | 1197 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1198 | Return 1 on success. */ |
17a37d48 | 1199 | |
9ddc1af1 | 1200 | static bool |
17a37d48 PP |
1201 | thread_db_load (void) |
1202 | { | |
122373f7 SM |
1203 | inferior *inf = current_inferior (); |
1204 | ||
1205 | /* When attaching / handling fork child, don't try loading libthread_db | |
1206 | until we know about all shared libraries. */ | |
1207 | if (inf->in_initial_library_scan) | |
1208 | return false; | |
17a37d48 | 1209 | |
122373f7 SM |
1210 | thread_db_info *info = get_thread_db_info (inf->process_target (), |
1211 | inferior_ptid.pid ()); | |
d90e17a7 PA |
1212 | |
1213 | if (info != NULL) | |
9ddc1af1 | 1214 | return true; |
17a37d48 | 1215 | |
856d6f99 PA |
1216 | /* Don't attempt to use thread_db on executables not running |
1217 | yet. */ | |
9dccd06e | 1218 | if (!target_has_registers ()) |
9ddc1af1 | 1219 | return false; |
17a37d48 PP |
1220 | |
1221 | /* Don't attempt to use thread_db for remote targets. */ | |
f6ac5f3d | 1222 | if (!(target_can_run () || core_bfd)) |
9ddc1af1 | 1223 | return false; |
17a37d48 PP |
1224 | |
1225 | if (thread_db_load_search ()) | |
9ddc1af1 | 1226 | return true; |
17a37d48 | 1227 | |
98a5dd13 DE |
1228 | /* We couldn't find a libthread_db. |
1229 | If the inferior has a libpthread warn the user. */ | |
1230 | if (has_libpthread ()) | |
1231 | { | |
1232 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1233 | " library, thread debugging will not be available.")); | |
9ddc1af1 | 1234 | return false; |
17a37d48 | 1235 | } |
98a5dd13 | 1236 | |
17a37d48 PP |
1237 | /* Either this executable isn't using libpthread at all, or it is |
1238 | statically linked. Since we can't easily distinguish these two cases, | |
1239 | no warning is issued. */ | |
9ddc1af1 | 1240 | return false; |
17a37d48 PP |
1241 | } |
1242 | ||
fb0e1ba7 MK |
1243 | static void |
1244 | check_thread_signals (void) | |
1245 | { | |
21bf60fe | 1246 | if (!thread_signals) |
fb0e1ba7 | 1247 | { |
fb0e1ba7 MK |
1248 | int i; |
1249 | ||
089436f7 | 1250 | for (i = 0; i < lin_thread_get_thread_signal_num (); i++) |
fb0e1ba7 | 1251 | { |
089436f7 TV |
1252 | int sig = lin_thread_get_thread_signal (i); |
1253 | signal_stop_update (gdb_signal_from_host (sig), 0); | |
1254 | signal_print_update (gdb_signal_from_host (sig), 0); | |
1255 | thread_signals = 1; | |
fb0e1ba7 MK |
1256 | } |
1257 | } | |
fb0e1ba7 MK |
1258 | } |
1259 | ||
0ec9a092 DJ |
1260 | /* Check whether thread_db is usable. This function is called when |
1261 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1262 | and when new shared libraries are loaded into a running process. */ | |
1263 | ||
ff770835 | 1264 | static void |
0ec9a092 | 1265 | check_for_thread_db (void) |
fb0e1ba7 | 1266 | { |
b5057acd | 1267 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1268 | if (!thread_db_load ()) |
b5057acd | 1269 | return; |
0ec9a092 DJ |
1270 | } |
1271 | ||
0838fb57 DE |
1272 | /* This function is called via the new_objfile observer. */ |
1273 | ||
0ec9a092 DJ |
1274 | static void |
1275 | thread_db_new_objfile (struct objfile *objfile) | |
1276 | { | |
d90e17a7 PA |
1277 | /* This observer must always be called with inferior_ptid set |
1278 | correctly. */ | |
1279 | ||
0838fb57 | 1280 | if (objfile != NULL |
fcb44371 | 1281 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 1282 | loaded (and notified without successful thread_db initialization) |
76727919 | 1283 | the time gdb::observers::new_objfile.notify is called for the library itself. |
fcb44371 JK |
1284 | Static executables have their separate debug info loaded already |
1285 | before the inferior has started. */ | |
1286 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1287 | /* Only check for thread_db if we loaded libpthread, |
1288 | or if this is the main symbol file. | |
1289 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1290 | a statically linked executable AND the symbol file is specified AFTER | |
1291 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1292 | For dynamically linked executables, libpthread can be near the end | |
1293 | of the list of shared libraries to load, and in an app of several | |
1294 | thousand shared libraries, this can otherwise be painful. */ | |
1295 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
e2b9ea4b | 1296 | || libpthread_objfile_p (objfile))) |
0ec9a092 | 1297 | check_for_thread_db (); |
fb0e1ba7 MK |
1298 | } |
1299 | ||
015de688 | 1300 | static void |
3f66685e | 1301 | check_pid_namespace_match (inferior *inf) |
015de688 DC |
1302 | { |
1303 | /* Check is only relevant for local targets targets. */ | |
f6ac5f3d | 1304 | if (target_can_run ()) |
015de688 DC |
1305 | { |
1306 | /* If the child is in a different PID namespace, its idea of its | |
1307 | PID will differ from our idea of its PID. When we scan the | |
1308 | child's thread list, we'll mistakenly think it has no threads | |
1309 | since the thread PID fields won't match the PID we give to | |
1310 | libthread_db. */ | |
3f66685e | 1311 | if (!linux_ns_same (inf->pid, LINUX_NS_PID)) |
015de688 DC |
1312 | { |
1313 | warning (_ ("Target and debugger are in different PID " | |
1314 | "namespaces; thread lists and other data are " | |
708bf0a1 JK |
1315 | "likely unreliable. " |
1316 | "Connect to gdbserver inside the container.")); | |
015de688 | 1317 | } |
015de688 DC |
1318 | } |
1319 | } | |
1320 | ||
0838fb57 DE |
1321 | /* This function is called via the inferior_created observer. |
1322 | This handles the case of debugging statically linked executables. */ | |
1323 | ||
1324 | static void | |
a0ff652f | 1325 | thread_db_inferior_created (inferior *inf) |
0838fb57 | 1326 | { |
3f66685e | 1327 | check_pid_namespace_match (inf); |
0838fb57 DE |
1328 | check_for_thread_db (); |
1329 | } | |
1330 | ||
c1a747c1 PA |
1331 | /* Update the thread's state (what's displayed in "info threads"), |
1332 | from libthread_db thread state information. */ | |
1333 | ||
1334 | static void | |
7aabaf9d | 1335 | update_thread_state (thread_db_thread_info *priv, |
c1a747c1 PA |
1336 | const td_thrinfo_t *ti_p) |
1337 | { | |
fe978cb0 PA |
1338 | priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN |
1339 | || ti_p->ti_state == TD_THR_ZOMBIE); | |
c1a747c1 PA |
1340 | } |
1341 | ||
2db9a427 | 1342 | /* Record a new thread in GDB's thread list. Creates the thread's |
be550b6e DE |
1343 | private info. If TP is NULL or TP is marked as having exited, |
1344 | creates a new thread. Otherwise, uses TP. */ | |
2db9a427 | 1345 | |
be550b6e | 1346 | static struct thread_info * |
2db9a427 PA |
1347 | record_thread (struct thread_db_info *info, |
1348 | struct thread_info *tp, | |
1349 | ptid_t ptid, const td_thrhandle_t *th_p, | |
1350 | const td_thrinfo_t *ti_p) | |
1351 | { | |
2db9a427 PA |
1352 | /* A thread ID of zero may mean the thread library has not |
1353 | initialized yet. Leave private == NULL until the thread library | |
1354 | has initialized. */ | |
1355 | if (ti_p->ti_tid == 0) | |
be550b6e | 1356 | return tp; |
2db9a427 | 1357 | |
17faa917 | 1358 | /* Construct the thread's private data. */ |
7aabaf9d | 1359 | thread_db_thread_info *priv = new thread_db_thread_info; |
17faa917 | 1360 | |
fe978cb0 PA |
1361 | priv->th = *th_p; |
1362 | priv->tid = ti_p->ti_tid; | |
1363 | update_thread_state (priv, ti_p); | |
17faa917 | 1364 | |
4eec2deb PA |
1365 | /* Add the thread to GDB's thread list. If we already know about a |
1366 | thread with this PTID, but it's marked exited, then the kernel | |
1367 | reused the tid of an old thread. */ | |
1368 | if (tp == NULL || tp->state == THREAD_EXITED) | |
5b6d1e4f | 1369 | tp = add_thread_with_info (info->process_target, ptid, priv); |
17faa917 | 1370 | else |
7aabaf9d | 1371 | tp->priv.reset (priv); |
5365276c | 1372 | |
55f6301a | 1373 | if (target_has_execution ()) |
2db9a427 | 1374 | check_thread_signals (); |
be550b6e DE |
1375 | |
1376 | return tp; | |
fb0e1ba7 MK |
1377 | } |
1378 | ||
f6ac5f3d PA |
1379 | void |
1380 | thread_db_target::detach (inferior *inf, int from_tty) | |
fb0e1ba7 | 1381 | { |
5b6d1e4f | 1382 | delete_thread_db_info (inf->process_target (), inf->pid); |
4105de34 | 1383 | |
d6ca69cd | 1384 | beneath ()->detach (inf, from_tty); |
d90e17a7 PA |
1385 | |
1386 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1387 | ||
5b6d1e4f | 1388 | /* Detach the thread_db target from this inferior. */ |
fadf6add | 1389 | inf->unpush_target (this); |
fb0e1ba7 MK |
1390 | } |
1391 | ||
f6ac5f3d PA |
1392 | ptid_t |
1393 | thread_db_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
b60cea74 | 1394 | target_wait_flags options) |
fb0e1ba7 | 1395 | { |
d90e17a7 | 1396 | struct thread_db_info *info; |
117de6a9 | 1397 | |
5b6d1e4f PA |
1398 | process_stratum_target *beneath |
1399 | = as_process_stratum_target (this->beneath ()); | |
1400 | ||
1401 | ptid = beneath->wait (ptid, ourstatus, options); | |
fb0e1ba7 | 1402 | |
183be222 | 1403 | switch (ourstatus->kind ()) |
aa01bd36 PA |
1404 | { |
1405 | case TARGET_WAITKIND_IGNORE: | |
1406 | case TARGET_WAITKIND_EXITED: | |
1407 | case TARGET_WAITKIND_THREAD_EXITED: | |
1408 | case TARGET_WAITKIND_SIGNALLED: | |
294c36eb | 1409 | case TARGET_WAITKIND_EXECD: |
aa01bd36 PA |
1410 | return ptid; |
1411 | } | |
fb0e1ba7 | 1412 | |
5b6d1e4f | 1413 | info = get_thread_db_info (beneath, ptid.pid ()); |
d90e17a7 PA |
1414 | |
1415 | /* If this process isn't using thread_db, we're done. */ | |
1416 | if (info == NULL) | |
1417 | return ptid; | |
1418 | ||
2db9a427 | 1419 | /* Fill in the thread's user-level thread id and status. */ |
5b6d1e4f | 1420 | thread_from_lwp (find_thread_ptid (beneath, ptid), ptid); |
fb0e1ba7 | 1421 | |
b9b5d7ea | 1422 | return ptid; |
fb0e1ba7 MK |
1423 | } |
1424 | ||
f6ac5f3d PA |
1425 | void |
1426 | thread_db_target::mourn_inferior () | |
fb0e1ba7 | 1427 | { |
5b6d1e4f PA |
1428 | process_stratum_target *target_beneath |
1429 | = as_process_stratum_target (this->beneath ()); | |
1430 | ||
1431 | delete_thread_db_info (target_beneath, inferior_ptid.pid ()); | |
fb0e1ba7 | 1432 | |
5b6d1e4f | 1433 | target_beneath->mourn_inferior (); |
d90e17a7 | 1434 | |
5b6d1e4f | 1435 | /* Detach the thread_db target from this inferior. */ |
fadf6add | 1436 | current_inferior ()->unpush_target (this); |
fb0e1ba7 MK |
1437 | } |
1438 | ||
294c36eb SM |
1439 | void |
1440 | thread_db_target::follow_exec (inferior *follow_inf, ptid_t ptid, | |
1441 | const char *execd_pathname) | |
1442 | { | |
1443 | process_stratum_target *beneath | |
1444 | = as_process_stratum_target (this->beneath ()); | |
1445 | ||
1446 | delete_thread_db_info (beneath, ptid.pid ()); | |
1447 | ||
1448 | current_inferior ()->unpush_target (this); | |
1449 | beneath->follow_exec (follow_inf, ptid, execd_pathname); | |
1450 | } | |
1451 | ||
02c6c942 PP |
1452 | struct callback_data |
1453 | { | |
1454 | struct thread_db_info *info; | |
1455 | int new_threads; | |
1456 | }; | |
1457 | ||
fb0e1ba7 MK |
1458 | static int |
1459 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1460 | { | |
1461 | td_thrinfo_t ti; | |
1462 | td_err_e err; | |
403fe197 | 1463 | struct thread_info *tp; |
9a3c8263 | 1464 | struct callback_data *cb_data = (struct callback_data *) data; |
02c6c942 | 1465 | struct thread_db_info *info = cb_data->info; |
fb0e1ba7 | 1466 | |
d90e17a7 | 1467 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1468 | if (err != TD_OK) |
8a3fe4f8 | 1469 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1470 | thread_db_err_str (err)); |
fb0e1ba7 | 1471 | |
a33e3959 PA |
1472 | if (ti.ti_lid == -1) |
1473 | { | |
1474 | /* A thread with kernel thread ID -1 is either a thread that | |
1475 | exited and was joined, or a thread that is being created but | |
1476 | hasn't started yet, and that is reusing the tcb/stack of a | |
1477 | thread that previously exited and was joined. (glibc marks | |
1478 | terminated and joined threads with kernel thread ID -1. See | |
1479 | glibc PR17707. */ | |
d6c146e9 | 1480 | if (libthread_db_debug) |
6cb06a8c TT |
1481 | gdb_printf (gdb_stdlog, |
1482 | "thread_db: skipping exited and " | |
1483 | "joined thread (0x%lx)\n", | |
1484 | (unsigned long) ti.ti_tid); | |
a33e3959 PA |
1485 | return 0; |
1486 | } | |
1487 | ||
254f582e | 1488 | if (ti.ti_tid == 0) |
4105de34 DJ |
1489 | { |
1490 | /* A thread ID of zero means that this is the main thread, but | |
1491 | glibc has not yet initialized thread-local storage and the | |
1492 | pthread library. We do not know what the thread's TID will | |
c2c2a31f | 1493 | be yet. */ |
4105de34 | 1494 | |
4d062f1a PA |
1495 | /* In that case, we're not stopped in a fork syscall and don't |
1496 | need this glibc bug workaround. */ | |
1497 | info->need_stale_parent_threads_check = 0; | |
1498 | ||
4105de34 DJ |
1499 | return 0; |
1500 | } | |
1501 | ||
4d062f1a PA |
1502 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1503 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1504 | avoid doing the work if we know we don't have to. */ | |
1505 | if (info->need_stale_parent_threads_check) | |
1506 | { | |
1507 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1508 | |
4d062f1a PA |
1509 | if (tgid != -1 && tgid != info->pid) |
1510 | return 0; | |
1511 | } | |
1512 | ||
00431a78 | 1513 | ptid_t ptid (info->pid, ti.ti_lid); |
5b6d1e4f | 1514 | tp = find_thread_ptid (info->process_target, ptid); |
fe978cb0 | 1515 | if (tp == NULL || tp->priv == NULL) |
60269a4a | 1516 | record_thread (info, tp, ptid, th_p, &ti); |
fb0e1ba7 MK |
1517 | |
1518 | return 0; | |
1519 | } | |
1520 | ||
02c6c942 PP |
1521 | /* Helper for thread_db_find_new_threads_2. |
1522 | Returns number of new threads found. */ | |
1523 | ||
1524 | static int | |
1525 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1526 | td_err_e *errp) |
02c6c942 | 1527 | { |
02c6c942 | 1528 | struct callback_data data; |
fb169834 | 1529 | td_err_e err = TD_ERR; |
02c6c942 PP |
1530 | |
1531 | data.info = info; | |
1532 | data.new_threads = 0; | |
1533 | ||
2db9a427 | 1534 | /* See comment in thread_db_update_thread_list. */ |
1eb2dbb8 | 1535 | gdb_assert (info->td_ta_thr_iter_p != NULL); |
2db9a427 | 1536 | |
a70b8144 | 1537 | try |
02c6c942 PP |
1538 | { |
1539 | /* Iterate over all user-space threads to discover new threads. */ | |
1540 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1541 | find_new_threads_callback, | |
1542 | &data, | |
1543 | TD_THR_ANY_STATE, | |
1544 | TD_THR_LOWEST_PRIORITY, | |
1545 | TD_SIGNO_MASK, | |
1546 | TD_THR_ANY_USER_FLAGS); | |
1547 | } | |
230d2906 | 1548 | catch (const gdb_exception_error &except) |
02c6c942 | 1549 | { |
6c63c96a | 1550 | if (libthread_db_debug) |
492d29ea PA |
1551 | { |
1552 | exception_fprintf (gdb_stdlog, except, | |
1553 | "Warning: find_new_threads_once: "); | |
1554 | } | |
6c63c96a | 1555 | } |
02c6c942 | 1556 | |
6c63c96a PA |
1557 | if (libthread_db_debug) |
1558 | { | |
6cb06a8c TT |
1559 | gdb_printf (gdb_stdlog, |
1560 | _("Found %d new threads in iteration %d.\n"), | |
1561 | data.new_threads, iteration); | |
02c6c942 PP |
1562 | } |
1563 | ||
1564 | if (errp != NULL) | |
1565 | *errp = err; | |
1566 | ||
1567 | return data.new_threads; | |
1568 | } | |
1569 | ||
4c28f408 | 1570 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1571 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1572 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1573 | |
fb0e1ba7 | 1574 | static void |
00431a78 | 1575 | thread_db_find_new_threads_2 (thread_info *stopped, bool until_no_new) |
fb0e1ba7 | 1576 | { |
fcb44371 | 1577 | td_err_e err = TD_OK; |
d90e17a7 | 1578 | struct thread_db_info *info; |
02c6c942 | 1579 | int i, loop; |
4c28f408 | 1580 | |
5b6d1e4f PA |
1581 | info = get_thread_db_info (stopped->inf->process_target (), |
1582 | stopped->ptid.pid ()); | |
d90e17a7 | 1583 | |
4c28f408 | 1584 | /* Access an lwp we know is stopped. */ |
00431a78 | 1585 | info->proc_handle.thread = stopped; |
02c6c942 PP |
1586 | |
1587 | if (until_no_new) | |
1588 | { | |
1589 | /* Require 4 successive iterations which do not find any new threads. | |
1590 | The 4 is a heuristic: there is an inherent race here, and I have | |
1591 | seen that 2 iterations in a row are not always sufficient to | |
1592 | "capture" all threads. */ | |
fcb44371 JK |
1593 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1594 | if (find_new_threads_once (info, i, &err) != 0) | |
1595 | { | |
1596 | /* Found some new threads. Restart the loop from beginning. */ | |
1597 | loop = -1; | |
1598 | } | |
02c6c942 PP |
1599 | } |
1600 | else | |
fcb44371 JK |
1601 | find_new_threads_once (info, 0, &err); |
1602 | ||
1603 | if (err != TD_OK) | |
1604 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1605 | } |
1606 | ||
02c6c942 | 1607 | static void |
00431a78 | 1608 | thread_db_find_new_threads_1 (thread_info *stopped) |
02c6c942 | 1609 | { |
00431a78 | 1610 | thread_db_find_new_threads_2 (stopped, 0); |
02c6c942 PP |
1611 | } |
1612 | ||
a6904d5a PA |
1613 | /* Implement the to_update_thread_list target method for this |
1614 | target. */ | |
2db9a427 | 1615 | |
f6ac5f3d PA |
1616 | void |
1617 | thread_db_target::update_thread_list () | |
28439f5e | 1618 | { |
d90e17a7 PA |
1619 | struct thread_db_info *info; |
1620 | ||
e8032dde PA |
1621 | prune_threads (); |
1622 | ||
08036331 | 1623 | for (inferior *inf : all_inferiors ()) |
c65b3e0d | 1624 | { |
c65b3e0d PA |
1625 | if (inf->pid == 0) |
1626 | continue; | |
d90e17a7 | 1627 | |
5b6d1e4f | 1628 | info = get_thread_db_info (inf->process_target (), inf->pid); |
c65b3e0d PA |
1629 | if (info == NULL) |
1630 | continue; | |
1631 | ||
5b6d1e4f | 1632 | thread_info *thread = any_live_thread_of_inferior (inf); |
611841bb | 1633 | if (thread == NULL || thread->executing ()) |
c65b3e0d PA |
1634 | continue; |
1635 | ||
a6904d5a PA |
1636 | /* It's best to avoid td_ta_thr_iter if possible. That walks |
1637 | data structures in the inferior's address space that may be | |
1638 | corrupted, or, if the target is running, the list may change | |
1639 | while we walk it. In the latter case, it's possible that a | |
1640 | thread exits just at the exact time that causes GDB to get | |
1641 | stuck in an infinite loop. To avoid pausing all threads | |
1642 | whenever the core wants to refresh the thread list, we | |
1643 | instead use thread_from_lwp immediately when we see an LWP | |
1644 | stop. That uses thread_db entry points that do not walk | |
1645 | libpthread's thread list, so should be safe, as well as more | |
1646 | efficient. */ | |
5018ce90 | 1647 | if (thread->inf->has_execution ()) |
a6904d5a PA |
1648 | continue; |
1649 | ||
00431a78 | 1650 | thread_db_find_new_threads_1 (thread); |
c65b3e0d | 1651 | } |
2db9a427 | 1652 | |
a6904d5a | 1653 | /* Give the beneath target a chance to do extra processing. */ |
b6a8c27b | 1654 | this->beneath ()->update_thread_list (); |
28439f5e PA |
1655 | } |
1656 | ||
a068643d | 1657 | std::string |
f6ac5f3d | 1658 | thread_db_target::pid_to_str (ptid_t ptid) |
fb0e1ba7 | 1659 | { |
5b6d1e4f | 1660 | thread_info *thread_info = find_thread_ptid (current_inferior (), ptid); |
17faa917 | 1661 | |
fe978cb0 | 1662 | if (thread_info != NULL && thread_info->priv != NULL) |
fb0e1ba7 | 1663 | { |
7aabaf9d | 1664 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
fb0e1ba7 | 1665 | |
a068643d TT |
1666 | return string_printf ("Thread 0x%lx (LWP %ld)", |
1667 | (unsigned long) priv->tid, ptid.lwp ()); | |
fb0e1ba7 MK |
1668 | } |
1669 | ||
d6ca69cd | 1670 | return beneath ()->pid_to_str (ptid); |
fb0e1ba7 MK |
1671 | } |
1672 | ||
28b17333 DJ |
1673 | /* Return a string describing the state of the thread specified by |
1674 | INFO. */ | |
1675 | ||
f6ac5f3d PA |
1676 | const char * |
1677 | thread_db_target::extra_thread_info (thread_info *info) | |
28b17333 | 1678 | { |
fe978cb0 | 1679 | if (info->priv == NULL) |
17faa917 DJ |
1680 | return NULL; |
1681 | ||
7aabaf9d SM |
1682 | thread_db_thread_info *priv = get_thread_db_thread_info (info); |
1683 | ||
1684 | if (priv->dying) | |
28b17333 DJ |
1685 | return "Exiting"; |
1686 | ||
1687 | return NULL; | |
1688 | } | |
1689 | ||
e04ee09e KB |
1690 | /* Return pointer to the thread_info struct which corresponds to |
1691 | THREAD_HANDLE (having length HANDLE_LEN). */ | |
1692 | ||
f6ac5f3d PA |
1693 | thread_info * |
1694 | thread_db_target::thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
1695 | int handle_len, | |
1696 | inferior *inf) | |
e04ee09e | 1697 | { |
e04ee09e KB |
1698 | thread_t handle_tid; |
1699 | ||
6bdfee81 KB |
1700 | /* When debugging a 32-bit target from a 64-bit host, handle_len |
1701 | will be 4 and sizeof (handle_tid) will be 8. This requires | |
1702 | a different cast than the more straightforward case where | |
1703 | the sizes are the same. | |
1704 | ||
1705 | Use "--target_board unix/-m32" from a native x86_64 linux build | |
1706 | to test the 32/64-bit case. */ | |
1707 | if (handle_len == 4 && sizeof (handle_tid) == 8) | |
1708 | handle_tid = (thread_t) * (const uint32_t *) thread_handle; | |
1709 | else if (handle_len == sizeof (handle_tid)) | |
1710 | handle_tid = * (const thread_t *) thread_handle; | |
1711 | else | |
e04ee09e KB |
1712 | error (_("Thread handle size mismatch: %d vs %zu (from libthread_db)"), |
1713 | handle_len, sizeof (handle_tid)); | |
1714 | ||
08036331 | 1715 | for (thread_info *tp : inf->non_exited_threads ()) |
e04ee09e | 1716 | { |
7aabaf9d SM |
1717 | thread_db_thread_info *priv = get_thread_db_thread_info (tp); |
1718 | ||
08036331 | 1719 | if (priv != NULL && handle_tid == priv->tid) |
dda83cd7 | 1720 | return tp; |
e04ee09e KB |
1721 | } |
1722 | ||
1723 | return NULL; | |
1724 | } | |
3d6c6204 KB |
1725 | |
1726 | /* Return the thread handle associated the thread_info pointer TP. */ | |
1727 | ||
1728 | gdb::byte_vector | |
1729 | thread_db_target::thread_info_to_thread_handle (struct thread_info *tp) | |
1730 | { | |
1731 | thread_db_thread_info *priv = get_thread_db_thread_info (tp); | |
1732 | ||
1733 | if (priv == NULL) | |
1734 | return gdb::byte_vector (); | |
1735 | ||
1736 | int handle_size = sizeof (priv->tid); | |
1737 | gdb::byte_vector rv (handle_size); | |
1738 | ||
1739 | memcpy (rv.data (), &priv->tid, handle_size); | |
1740 | ||
1741 | return rv; | |
1742 | } | |
e04ee09e | 1743 | |
b2756930 KB |
1744 | /* Get the address of the thread local variable in load module LM which |
1745 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c | 1746 | |
f6ac5f3d PA |
1747 | CORE_ADDR |
1748 | thread_db_target::get_thread_local_address (ptid_t ptid, | |
1749 | CORE_ADDR lm, | |
1750 | CORE_ADDR offset) | |
3f47be5c | 1751 | { |
17faa917 | 1752 | struct thread_info *thread_info; |
5b6d1e4f PA |
1753 | process_stratum_target *beneath |
1754 | = as_process_stratum_target (this->beneath ()); | |
17faa917 | 1755 | /* Find the matching thread. */ |
5b6d1e4f | 1756 | thread_info = find_thread_ptid (beneath, ptid); |
4105de34 | 1757 | |
e0fd7c47 UW |
1758 | /* We may not have discovered the thread yet. */ |
1759 | if (thread_info != NULL && thread_info->priv == NULL) | |
00431a78 | 1760 | thread_info = thread_from_lwp (thread_info, ptid); |
e0fd7c47 | 1761 | |
fe978cb0 | 1762 | if (thread_info != NULL && thread_info->priv != NULL) |
3f47be5c | 1763 | { |
3f47be5c | 1764 | td_err_e err; |
00f515da | 1765 | psaddr_t address; |
5b6d1e4f | 1766 | thread_db_info *info = get_thread_db_info (beneath, ptid.pid ()); |
7aabaf9d | 1767 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
3f47be5c | 1768 | |
3f47be5c | 1769 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1770 | if (lm != 0) |
1771 | { | |
1772 | /* glibc doesn't provide the needed interface. */ | |
1773 | if (!info->td_thr_tls_get_addr_p) | |
1774 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1775 | _("No TLS library support")); | |
1776 | ||
1777 | /* Note the cast through uintptr_t: this interface only works if | |
1778 | a target address fits in a psaddr_t, which is a host pointer. | |
1779 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
7aabaf9d | 1780 | err = info->td_thr_tls_get_addr_p (&priv->th, |
5876f503 JK |
1781 | (psaddr_t)(uintptr_t) lm, |
1782 | offset, &address); | |
1783 | } | |
1784 | else | |
1785 | { | |
1786 | /* If glibc doesn't provide the needed interface throw an error | |
1787 | that LM is zero - normally cases it should not be. */ | |
1788 | if (!info->td_thr_tlsbase_p) | |
1789 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1790 | _("TLS load module not found")); | |
1791 | ||
1792 | /* This code path handles the case of -static -pthread executables: | |
1793 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1794 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1795 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1796 | The constant number 1 depends on GNU __libc_setup_tls | |
1797 | initialization of l_tls_modid to 1. */ | |
7aabaf9d | 1798 | err = info->td_thr_tlsbase_p (&priv->th, 1, &address); |
5876f503 JK |
1799 | address = (char *) address + offset; |
1800 | } | |
3f47be5c EZ |
1801 | |
1802 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1803 | /* The memory hasn't been allocated, yet. */ | |
1804 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1805 | /* Now, if libthread_db provided the initialization image's |
1806 | address, we *could* try to build a non-lvalue value from | |
1807 | the initialization image. */ | |
dda83cd7 SM |
1808 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1809 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1810 | #endif |
1811 | ||
1812 | /* Something else went wrong. */ | |
1813 | if (err != TD_OK) | |
dda83cd7 SM |
1814 | throw_error (TLS_GENERIC_ERROR, |
1815 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1816 | |
1817 | /* Cast assuming host == target. Joy. */ | |
16451949 | 1818 | /* Do proper sign extension for the target. */ |
7e10abd1 TT |
1819 | gdb_assert (current_program_space->exec_bfd ()); |
1820 | return (bfd_get_sign_extend_vma (current_program_space->exec_bfd ()) > 0 | |
16451949 AS |
1821 | ? (CORE_ADDR) (intptr_t) address |
1822 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1823 | } |
1824 | ||
5b6d1e4f | 1825 | return beneath->get_thread_local_address (ptid, lm, offset); |
3f47be5c EZ |
1826 | } |
1827 | ||
0ef643c8 JB |
1828 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
1829 | ||
f6ac5f3d | 1830 | ptid_t |
c80e29db | 1831 | thread_db_target::get_ada_task_ptid (long lwp, ULONGEST thread) |
0ef643c8 | 1832 | { |
2db9a427 | 1833 | /* NPTL uses a 1:1 model, so the LWP id suffices. */ |
184ea2f7 | 1834 | return ptid_t (inferior_ptid.pid (), lwp); |
0ef643c8 JB |
1835 | } |
1836 | ||
f6ac5f3d PA |
1837 | void |
1838 | thread_db_target::resume (ptid_t ptid, int step, enum gdb_signal signo) | |
4d062f1a | 1839 | { |
5b6d1e4f PA |
1840 | process_stratum_target *beneath |
1841 | = as_process_stratum_target (this->beneath ()); | |
4d062f1a | 1842 | |
5b6d1e4f PA |
1843 | thread_db_info *info |
1844 | = get_thread_db_info (beneath, (ptid == minus_one_ptid | |
1845 | ? inferior_ptid.pid () | |
1846 | : ptid.pid ())); | |
4d062f1a PA |
1847 | |
1848 | /* This workaround is only needed for child fork lwps stopped in a | |
1849 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1850 | workaround can be disabled. */ | |
1851 | if (info) | |
1852 | info->need_stale_parent_threads_check = 0; | |
1853 | ||
5b6d1e4f | 1854 | beneath->resume (ptid, step, signo); |
4d062f1a PA |
1855 | } |
1856 | ||
9b292f68 | 1857 | /* std::sort helper function for info_auto_load_libthread_db, sort the |
bf88dd68 JK |
1858 | thread_db_info pointers primarily by their FILENAME and secondarily by their |
1859 | PID, both in ascending order. */ | |
1860 | ||
9b292f68 TT |
1861 | static bool |
1862 | info_auto_load_libthread_db_compare (const struct thread_db_info *a, | |
1863 | const struct thread_db_info *b) | |
bf88dd68 | 1864 | { |
bf88dd68 JK |
1865 | int retval; |
1866 | ||
1867 | retval = strcmp (a->filename, b->filename); | |
1868 | if (retval) | |
9b292f68 | 1869 | return retval < 0; |
bf88dd68 | 1870 | |
9b292f68 | 1871 | return a->pid < b->pid; |
bf88dd68 JK |
1872 | } |
1873 | ||
1874 | /* Implement 'info auto-load libthread-db'. */ | |
1875 | ||
1876 | static void | |
5fed81ff | 1877 | info_auto_load_libthread_db (const char *args, int from_tty) |
bf88dd68 JK |
1878 | { |
1879 | struct ui_out *uiout = current_uiout; | |
1880 | const char *cs = args ? args : ""; | |
9b292f68 TT |
1881 | struct thread_db_info *info; |
1882 | unsigned unique_filenames; | |
1883 | size_t max_filename_len, pids_len; | |
bf88dd68 JK |
1884 | int i; |
1885 | ||
f1735a53 | 1886 | cs = skip_spaces (cs); |
bf88dd68 JK |
1887 | if (*cs) |
1888 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1889 | ||
9b292f68 | 1890 | std::vector<struct thread_db_info *> array; |
bf88dd68 JK |
1891 | for (info = thread_db_list; info; info = info->next) |
1892 | if (info->filename != NULL) | |
9b292f68 | 1893 | array.push_back (info); |
bf88dd68 JK |
1894 | |
1895 | /* Sort ARRAY by filenames and PIDs. */ | |
9b292f68 TT |
1896 | std::sort (array.begin (), array.end (), |
1897 | info_auto_load_libthread_db_compare); | |
bf88dd68 JK |
1898 | |
1899 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1900 | length of PIDs list for the unique filenames (columns). */ | |
1901 | ||
1902 | unique_filenames = 0; | |
1903 | max_filename_len = 0; | |
bf88dd68 | 1904 | pids_len = 0; |
9b292f68 | 1905 | for (i = 0; i < array.size (); i++) |
bf88dd68 JK |
1906 | { |
1907 | int pid = array[i]->pid; | |
1908 | size_t this_pid_len; | |
1909 | ||
1910 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1911 | this_pid_len++; | |
1912 | ||
1913 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1914 | { | |
1915 | unique_filenames++; | |
325fac50 PA |
1916 | max_filename_len = std::max (max_filename_len, |
1917 | strlen (array[i]->filename)); | |
bf88dd68 JK |
1918 | |
1919 | if (i > 0) | |
9b292f68 | 1920 | pids_len -= strlen (", "); |
bf88dd68 JK |
1921 | pids_len = 0; |
1922 | } | |
1923 | pids_len += this_pid_len + strlen (", "); | |
1924 | } | |
1925 | if (i) | |
9b292f68 | 1926 | pids_len -= strlen (", "); |
bf88dd68 JK |
1927 | |
1928 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1929 | its columns. */ | |
9b292f68 | 1930 | if (array.size () > 0 && args == auto_load_info_scripts_pattern_nl) |
112e8700 | 1931 | uiout->text ("\n"); |
bf88dd68 | 1932 | |
4a2b031d TT |
1933 | { |
1934 | ui_out_emit_table table_emitter (uiout, 2, unique_filenames, | |
1935 | "LinuxThreadDbTable"); | |
bf88dd68 | 1936 | |
4a2b031d TT |
1937 | uiout->table_header (max_filename_len, ui_left, "filename", "Filename"); |
1938 | uiout->table_header (pids_len, ui_left, "PIDs", "Pids"); | |
1939 | uiout->table_body (); | |
bf88dd68 | 1940 | |
4a2b031d | 1941 | /* Note I is incremented inside the cycle, not at its end. */ |
9b292f68 | 1942 | for (i = 0; i < array.size ();) |
4a2b031d TT |
1943 | { |
1944 | ui_out_emit_tuple tuple_emitter (uiout, NULL); | |
bf88dd68 | 1945 | |
4a2b031d | 1946 | info = array[i]; |
972f7a4b TT |
1947 | uiout->field_string ("filename", info->filename, |
1948 | file_name_style.style ()); | |
bf88dd68 | 1949 | |
9b292f68 TT |
1950 | std::string pids; |
1951 | while (i < array.size () && strcmp (info->filename, | |
1952 | array[i]->filename) == 0) | |
4a2b031d | 1953 | { |
9b292f68 TT |
1954 | if (!pids.empty ()) |
1955 | pids += ", "; | |
1956 | string_appendf (pids, "%u", array[i]->pid); | |
4a2b031d TT |
1957 | i++; |
1958 | } | |
bf88dd68 | 1959 | |
8dd8c8d4 | 1960 | uiout->field_string ("pids", pids); |
bf88dd68 | 1961 | |
4a2b031d TT |
1962 | uiout->text ("\n"); |
1963 | } | |
1964 | } | |
bf88dd68 | 1965 | |
9b292f68 | 1966 | if (array.empty ()) |
112e8700 | 1967 | uiout->message (_("No auto-loaded libthread-db.\n")); |
bf88dd68 JK |
1968 | } |
1969 | ||
5045b3d7 GB |
1970 | /* Implement 'maintenance check libthread-db'. */ |
1971 | ||
1972 | static void | |
1973 | maintenance_check_libthread_db (const char *args, int from_tty) | |
1974 | { | |
e99b03dc | 1975 | int inferior_pid = inferior_ptid.pid (); |
5045b3d7 GB |
1976 | struct thread_db_info *info; |
1977 | ||
1978 | if (inferior_pid == 0) | |
1979 | error (_("No inferior running")); | |
1980 | ||
5b6d1e4f PA |
1981 | info = get_thread_db_info (current_inferior ()->process_target (), |
1982 | inferior_pid); | |
5045b3d7 GB |
1983 | if (info == NULL) |
1984 | error (_("No libthread_db loaded")); | |
1985 | ||
1986 | check_thread_db (info, true); | |
1987 | } | |
1988 | ||
6c265988 | 1989 | void _initialize_thread_db (); |
fb0e1ba7 | 1990 | void |
6c265988 | 1991 | _initialize_thread_db () |
fb0e1ba7 | 1992 | { |
17a37d48 PP |
1993 | /* Defer loading of libthread_db.so until inferior is running. |
1994 | This allows gdb to load correct libthread_db for a given | |
4a6ed09b PA |
1995 | executable -- there could be multiple versions of glibc, |
1996 | and until there is a running inferior, we can't tell which | |
1997 | libthread_db is the correct one to load. */ | |
17a37d48 | 1998 | |
17a37d48 PP |
1999 | add_setshow_optional_filename_cmd ("libthread-db-search-path", |
2000 | class_support, | |
2001 | &libthread_db_search_path, _("\ | |
2002 | Set search path for libthread_db."), _("\ | |
2003 | Show the current search path or libthread_db."), _("\ | |
2004 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
2005 | gdb itself.\n\ |
2006 | Its value is a colon (':') separate list of directories to search.\n\ | |
2007 | Setting the search path to an empty list resets it to its default value."), | |
2008 | set_libthread_db_search_path, | |
17a37d48 PP |
2009 | NULL, |
2010 | &setlist, &showlist); | |
02d868e8 | 2011 | |
ccce17b0 YQ |
2012 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
2013 | &libthread_db_debug, _("\ | |
02d868e8 PP |
2014 | Set libthread-db debugging."), _("\ |
2015 | Show libthread-db debugging."), _("\ | |
2016 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
2017 | NULL, |
2018 | show_libthread_db_debug, | |
2019 | &setdebuglist, &showdebuglist); | |
02d868e8 | 2020 | |
bf88dd68 JK |
2021 | add_setshow_boolean_cmd ("libthread-db", class_support, |
2022 | &auto_load_thread_db, _("\ | |
2023 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
2024 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
2025 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
2026 | locations to load libthread_db compatible with the inferior.\n\ | |
2027 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
8d8c087f | 2028 | This option has security implications for untrusted inferiors."), |
bf88dd68 JK |
2029 | NULL, show_auto_load_thread_db, |
2030 | auto_load_set_cmdlist_get (), | |
2031 | auto_load_show_cmdlist_get ()); | |
2032 | ||
2033 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
2034 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
2035 | Usage: info auto-load libthread-db"), | |
2036 | auto_load_info_cmdlist_get ()); | |
2037 | ||
5045b3d7 GB |
2038 | add_cmd ("libthread-db", class_maintenance, |
2039 | maintenance_check_libthread_db, _("\ | |
2040 | Run integrity checks on the current inferior's libthread_db."), | |
2041 | &maintenancechecklist); | |
2042 | ||
2043 | add_setshow_boolean_cmd ("check-libthread-db", | |
2044 | class_maintenance, | |
2045 | &check_thread_db_on_load, _("\ | |
2046 | Set whether to check libthread_db at load time."), _("\ | |
2047 | Show whether to check libthread_db at load time."), _("\ | |
2048 | If enabled GDB will run integrity checks on inferior specific libthread_db\n\ | |
2049 | as they are loaded."), | |
2050 | NULL, | |
2051 | NULL, | |
2052 | &maintenance_set_cmdlist, | |
2053 | &maintenance_show_cmdlist); | |
2054 | ||
17a37d48 | 2055 | /* Add ourselves to objfile event chain. */ |
c90e7d63 | 2056 | gdb::observers::new_objfile.attach (thread_db_new_objfile, "linux-thread-db"); |
0838fb57 DE |
2057 | |
2058 | /* Add ourselves to inferior_created event chain. | |
2059 | This is needed to handle debugging statically linked programs where | |
2060 | the new_objfile observer won't get called for libpthread. */ | |
c90e7d63 SM |
2061 | gdb::observers::inferior_created.attach (thread_db_inferior_created, |
2062 | "linux-thread-db"); | |
fb0e1ba7 | 2063 | } |