Commit | Line | Data |
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fb0e1ba7 | 1 | /* libthread_db assisted debugging support, generic parts. |
1bac305b | 2 | |
e2882c85 | 3 | Copyright (C) 1999-2018 Free Software Foundation, Inc. |
fb0e1ba7 MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
fb0e1ba7 MK |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
fb0e1ba7 MK |
19 | |
20 | #include "defs.h" | |
fb0e1ba7 MK |
21 | #include <dlfcn.h> |
22 | #include "gdb_proc_service.h" | |
125f8a3d | 23 | #include "nat/gdb_thread_db.h" |
e6712ff1 | 24 | #include "gdb_vecs.h" |
bda9cb72 | 25 | #include "bfd.h" |
17a37d48 | 26 | #include "command.h" |
17a37d48 | 27 | #include "gdbcmd.h" |
fb0e1ba7 MK |
28 | #include "gdbthread.h" |
29 | #include "inferior.h" | |
45741a9c | 30 | #include "infrun.h" |
bda9cb72 MK |
31 | #include "symfile.h" |
32 | #include "objfiles.h" | |
fb0e1ba7 | 33 | #include "target.h" |
4e052eda | 34 | #include "regcache.h" |
17a37d48 | 35 | #include "solib.h" |
3f47be5c | 36 | #include "solib-svr4.h" |
16451949 | 37 | #include "gdbcore.h" |
76727919 | 38 | #include "observable.h" |
0ec9a092 | 39 | #include "linux-nat.h" |
125f8a3d | 40 | #include "nat/linux-procfs.h" |
c1a747c1 | 41 | #include "nat/linux-ptrace.h" |
125f8a3d | 42 | #include "nat/linux-osdata.h" |
bf88dd68 | 43 | #include "auto-load.h" |
529480d0 | 44 | #include "cli/cli-utils.h" |
979894f2 | 45 | #include <signal.h> |
bf88dd68 | 46 | #include <ctype.h> |
9bc3a976 | 47 | #include "nat/linux-namespaces.h" |
325fac50 | 48 | #include <algorithm> |
b4987c95 | 49 | #include "common/pathstuff.h" |
5045b3d7 | 50 | #include "valprint.h" |
979894f2 | 51 | |
17faa917 DJ |
52 | /* GNU/Linux libthread_db support. |
53 | ||
54 | libthread_db is a library, provided along with libpthread.so, which | |
55 | exposes the internals of the thread library to a debugger. It | |
56 | allows GDB to find existing threads, new threads as they are | |
57 | created, thread IDs (usually, the result of pthread_self), and | |
58 | thread-local variables. | |
59 | ||
4a6ed09b PA |
60 | The libthread_db interface originates on Solaris, where it is both |
61 | more powerful and more complicated. This implementation only works | |
62 | for NPTL, the glibc threading library. It assumes that each thread | |
63 | is permanently assigned to a single light-weight process (LWP). At | |
64 | some point it also supported the older LinuxThreads library, but it | |
65 | no longer does. | |
17faa917 DJ |
66 | |
67 | libthread_db-specific information is stored in the "private" field | |
68 | of struct thread_info. When the field is NULL we do not yet have | |
69 | information about the new thread; this could be temporary (created, | |
70 | but the thread library's data structures do not reflect it yet) | |
71 | or permanent (created using clone instead of pthread_create). | |
72 | ||
73 | Process IDs managed by linux-thread-db.c match those used by | |
74 | linux-nat.c: a common PID for all processes, an LWP ID for each | |
75 | thread, and no TID. We save the TID in private. Keeping it out | |
76 | of the ptid_t prevents thread IDs changing when libpthread is | |
77 | loaded or unloaded. */ | |
78 | ||
d9f719f1 PA |
79 | static const target_info thread_db_target_info = { |
80 | "multi-thread", | |
81 | N_("multi-threaded child process."), | |
82 | N_("Threads and pthreads support.") | |
83 | }; | |
84 | ||
f6ac5f3d PA |
85 | class thread_db_target final : public target_ops |
86 | { | |
87 | public: | |
88 | thread_db_target (); | |
89 | ||
d9f719f1 PA |
90 | const target_info &info () const override |
91 | { return thread_db_target_info; } | |
f6ac5f3d PA |
92 | |
93 | void detach (inferior *, int) override; | |
94 | ptid_t wait (ptid_t, struct target_waitstatus *, int) override; | |
95 | void resume (ptid_t, int, enum gdb_signal) override; | |
96 | void mourn_inferior () override; | |
97 | void update_thread_list () override; | |
98 | const char *pid_to_str (ptid_t) override; | |
99 | CORE_ADDR get_thread_local_address (ptid_t ptid, | |
100 | CORE_ADDR load_module_addr, | |
101 | CORE_ADDR offset) override; | |
102 | const char *extra_thread_info (struct thread_info *) override; | |
103 | ptid_t get_ada_task_ptid (long lwp, long thread) override; | |
104 | ||
105 | thread_info *thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
106 | int handle_len, | |
107 | inferior *inf) override; | |
108 | }; | |
109 | ||
110 | thread_db_target::thread_db_target () | |
111 | { | |
112 | this->to_stratum = thread_stratum; | |
113 | } | |
114 | ||
17a37d48 PP |
115 | static char *libthread_db_search_path; |
116 | ||
bf88dd68 JK |
117 | /* Set to non-zero if thread_db auto-loading is enabled |
118 | by the "set auto-load libthread-db" command. */ | |
119 | static int auto_load_thread_db = 1; | |
120 | ||
5045b3d7 GB |
121 | /* Set to non-zero if load-time libthread_db tests have been enabled |
122 | by the "maintenence set check-libthread-db" command. */ | |
123 | static int check_thread_db_on_load = 0; | |
124 | ||
bf88dd68 JK |
125 | /* "show" command for the auto_load_thread_db configuration variable. */ |
126 | ||
127 | static void | |
128 | show_auto_load_thread_db (struct ui_file *file, int from_tty, | |
129 | struct cmd_list_element *c, const char *value) | |
130 | { | |
131 | fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db " | |
132 | "is %s.\n"), | |
133 | value); | |
134 | } | |
135 | ||
84e578fb | 136 | static void |
eb4c3f4a | 137 | set_libthread_db_search_path (const char *ignored, int from_tty, |
84e578fb DE |
138 | struct cmd_list_element *c) |
139 | { | |
140 | if (*libthread_db_search_path == '\0') | |
141 | { | |
142 | xfree (libthread_db_search_path); | |
143 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
144 | } | |
145 | } | |
146 | ||
02d868e8 PP |
147 | /* If non-zero, print details of libthread_db processing. */ |
148 | ||
ccce17b0 | 149 | static unsigned int libthread_db_debug; |
02d868e8 PP |
150 | |
151 | static void | |
152 | show_libthread_db_debug (struct ui_file *file, int from_tty, | |
153 | struct cmd_list_element *c, const char *value) | |
154 | { | |
155 | fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value); | |
156 | } | |
157 | ||
8605d56e AC |
158 | /* If we're running on GNU/Linux, we must explicitly attach to any new |
159 | threads. */ | |
fb0e1ba7 | 160 | |
fb0e1ba7 | 161 | /* This module's target vector. */ |
f6ac5f3d | 162 | static thread_db_target the_thread_db_target; |
fb0e1ba7 | 163 | |
fb0e1ba7 MK |
164 | /* Non-zero if we have determined the signals used by the threads |
165 | library. */ | |
166 | static int thread_signals; | |
167 | static sigset_t thread_stop_set; | |
168 | static sigset_t thread_print_set; | |
169 | ||
d90e17a7 PA |
170 | struct thread_db_info |
171 | { | |
172 | struct thread_db_info *next; | |
173 | ||
174 | /* Process id this object refers to. */ | |
175 | int pid; | |
176 | ||
177 | /* Handle from dlopen for libthread_db.so. */ | |
178 | void *handle; | |
179 | ||
bf88dd68 JK |
180 | /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing |
181 | HANDLE. It may be NULL for system library. */ | |
182 | char *filename; | |
183 | ||
d90e17a7 PA |
184 | /* Structure that identifies the child process for the |
185 | <proc_service.h> interface. */ | |
186 | struct ps_prochandle proc_handle; | |
187 | ||
188 | /* Connection to the libthread_db library. */ | |
189 | td_thragent_t *thread_agent; | |
190 | ||
4d062f1a PA |
191 | /* True if we need to apply the workaround for glibc/BZ5983. When |
192 | we catch a PTRACE_O_TRACEFORK, and go query the child's thread | |
193 | list, nptl_db returns the parent's threads in addition to the new | |
194 | (single) child thread. If this flag is set, we do extra work to | |
195 | be able to ignore such stale entries. */ | |
196 | int need_stale_parent_threads_check; | |
197 | ||
d90e17a7 | 198 | /* Pointers to the libthread_db functions. */ |
fb0e1ba7 | 199 | |
96e9210f PA |
200 | td_init_ftype *td_init_p; |
201 | td_ta_new_ftype *td_ta_new_p; | |
202 | td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p; | |
203 | td_ta_thr_iter_ftype *td_ta_thr_iter_p; | |
96e9210f | 204 | td_thr_get_info_ftype *td_thr_get_info_p; |
96e9210f PA |
205 | td_thr_tls_get_addr_ftype *td_thr_tls_get_addr_p; |
206 | td_thr_tlsbase_ftype *td_thr_tlsbase_p; | |
d90e17a7 PA |
207 | }; |
208 | ||
209 | /* List of known processes using thread_db, and the required | |
210 | bookkeeping. */ | |
211 | struct thread_db_info *thread_db_list; | |
212 | ||
213 | static void thread_db_find_new_threads_1 (ptid_t ptid); | |
02c6c942 | 214 | static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new); |
d90e17a7 | 215 | |
2db9a427 PA |
216 | static void check_thread_signals (void); |
217 | ||
be550b6e DE |
218 | static struct thread_info *record_thread |
219 | (struct thread_db_info *info, struct thread_info *tp, | |
220 | ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p); | |
2db9a427 | 221 | |
d90e17a7 PA |
222 | /* Add the current inferior to the list of processes using libpthread. |
223 | Return a pointer to the newly allocated object that was added to | |
224 | THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing | |
225 | LIBTHREAD_DB_SO. */ | |
226 | ||
227 | static struct thread_db_info * | |
228 | add_thread_db_info (void *handle) | |
229 | { | |
8d749320 | 230 | struct thread_db_info *info = XCNEW (struct thread_db_info); |
d90e17a7 | 231 | |
d90e17a7 PA |
232 | info->pid = ptid_get_pid (inferior_ptid); |
233 | info->handle = handle; | |
856d6f99 PA |
234 | |
235 | /* The workaround works by reading from /proc/pid/status, so it is | |
236 | disabled for core files. */ | |
237 | if (target_has_execution) | |
238 | info->need_stale_parent_threads_check = 1; | |
d90e17a7 PA |
239 | |
240 | info->next = thread_db_list; | |
241 | thread_db_list = info; | |
242 | ||
243 | return info; | |
244 | } | |
245 | ||
246 | /* Return the thread_db_info object representing the bookkeeping | |
247 | related to process PID, if any; NULL otherwise. */ | |
248 | ||
249 | static struct thread_db_info * | |
250 | get_thread_db_info (int pid) | |
251 | { | |
252 | struct thread_db_info *info; | |
253 | ||
254 | for (info = thread_db_list; info; info = info->next) | |
255 | if (pid == info->pid) | |
256 | return info; | |
257 | ||
258 | return NULL; | |
259 | } | |
260 | ||
261 | /* When PID has exited or has been detached, we no longer want to keep | |
262 | track of it as using libpthread. Call this function to discard | |
263 | thread_db related info related to PID. Note that this closes | |
264 | LIBTHREAD_DB_SO's dlopen'ed handle. */ | |
265 | ||
266 | static void | |
267 | delete_thread_db_info (int pid) | |
268 | { | |
269 | struct thread_db_info *info, *info_prev; | |
270 | ||
271 | info_prev = NULL; | |
272 | ||
273 | for (info = thread_db_list; info; info_prev = info, info = info->next) | |
274 | if (pid == info->pid) | |
275 | break; | |
276 | ||
277 | if (info == NULL) | |
278 | return; | |
279 | ||
280 | if (info->handle != NULL) | |
281 | dlclose (info->handle); | |
282 | ||
bf88dd68 JK |
283 | xfree (info->filename); |
284 | ||
d90e17a7 PA |
285 | if (info_prev) |
286 | info_prev->next = info->next; | |
287 | else | |
288 | thread_db_list = info->next; | |
289 | ||
290 | xfree (info); | |
291 | } | |
fb0e1ba7 | 292 | |
5365276c DJ |
293 | /* Use "struct private_thread_info" to cache thread state. This is |
294 | a substantial optimization. */ | |
295 | ||
7aabaf9d | 296 | struct thread_db_thread_info : public private_thread_info |
fb0e1ba7 | 297 | { |
a2f23071 | 298 | /* Flag set when we see a TD_DEATH event for this thread. */ |
7aabaf9d | 299 | bool dying = false; |
a2f23071 | 300 | |
5365276c | 301 | /* Cached thread state. */ |
7aabaf9d SM |
302 | td_thrhandle_t th {}; |
303 | thread_t tid {}; | |
fb0e1ba7 | 304 | }; |
7aabaf9d SM |
305 | |
306 | static thread_db_thread_info * | |
307 | get_thread_db_thread_info (thread_info *thread) | |
308 | { | |
309 | return static_cast<thread_db_thread_info *> (thread->priv.get ()); | |
310 | } | |
21bf60fe | 311 | |
a121b7c1 | 312 | static const char * |
fb0e1ba7 MK |
313 | thread_db_err_str (td_err_e err) |
314 | { | |
315 | static char buf[64]; | |
316 | ||
317 | switch (err) | |
318 | { | |
319 | case TD_OK: | |
320 | return "generic 'call succeeded'"; | |
321 | case TD_ERR: | |
322 | return "generic error"; | |
323 | case TD_NOTHR: | |
324 | return "no thread to satisfy query"; | |
325 | case TD_NOSV: | |
326 | return "no sync handle to satisfy query"; | |
327 | case TD_NOLWP: | |
328 | return "no LWP to satisfy query"; | |
329 | case TD_BADPH: | |
330 | return "invalid process handle"; | |
331 | case TD_BADTH: | |
332 | return "invalid thread handle"; | |
333 | case TD_BADSH: | |
334 | return "invalid synchronization handle"; | |
335 | case TD_BADTA: | |
336 | return "invalid thread agent"; | |
337 | case TD_BADKEY: | |
338 | return "invalid key"; | |
339 | case TD_NOMSG: | |
340 | return "no event message for getmsg"; | |
341 | case TD_NOFPREGS: | |
342 | return "FPU register set not available"; | |
343 | case TD_NOLIBTHREAD: | |
344 | return "application not linked with libthread"; | |
345 | case TD_NOEVENT: | |
346 | return "requested event is not supported"; | |
347 | case TD_NOCAPAB: | |
348 | return "capability not available"; | |
349 | case TD_DBERR: | |
350 | return "debugger service failed"; | |
351 | case TD_NOAPLIC: | |
352 | return "operation not applicable to"; | |
353 | case TD_NOTSD: | |
354 | return "no thread-specific data for this thread"; | |
355 | case TD_MALLOC: | |
356 | return "malloc failed"; | |
357 | case TD_PARTIALREG: | |
358 | return "only part of register set was written/read"; | |
359 | case TD_NOXREGS: | |
360 | return "X register set not available for this thread"; | |
59f80f10 DJ |
361 | #ifdef THREAD_DB_HAS_TD_NOTALLOC |
362 | case TD_NOTALLOC: | |
363 | return "thread has not yet allocated TLS for given module"; | |
364 | #endif | |
365 | #ifdef THREAD_DB_HAS_TD_VERSION | |
366 | case TD_VERSION: | |
367 | return "versions of libpthread and libthread_db do not match"; | |
368 | #endif | |
369 | #ifdef THREAD_DB_HAS_TD_NOTLS | |
370 | case TD_NOTLS: | |
371 | return "there is no TLS segment in the given module"; | |
372 | #endif | |
fb0e1ba7 MK |
373 | default: |
374 | snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); | |
375 | return buf; | |
376 | } | |
377 | } | |
4105de34 | 378 | |
64776a0b | 379 | /* Fetch the user-level thread id of PTID. */ |
fb0e1ba7 | 380 | |
be550b6e | 381 | static struct thread_info * |
39f77062 | 382 | thread_from_lwp (ptid_t ptid) |
fb0e1ba7 | 383 | { |
fb0e1ba7 | 384 | td_thrhandle_t th; |
2db9a427 | 385 | td_thrinfo_t ti; |
fb0e1ba7 | 386 | td_err_e err; |
d90e17a7 | 387 | struct thread_db_info *info; |
2db9a427 | 388 | struct thread_info *tp; |
fb0e1ba7 | 389 | |
6cb9b55b PP |
390 | /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */ |
391 | th.th_unique = 0; | |
392 | ||
17faa917 DJ |
393 | /* This ptid comes from linux-nat.c, which should always fill in the |
394 | LWP. */ | |
dfd4cc63 | 395 | gdb_assert (ptid_get_lwp (ptid) != 0); |
fb0e1ba7 | 396 | |
dfd4cc63 | 397 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 398 | |
4c28f408 | 399 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 400 | info->proc_handle.ptid = ptid; |
dfd4cc63 LM |
401 | err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid), |
402 | &th); | |
fb0e1ba7 | 403 | if (err != TD_OK) |
8a3fe4f8 | 404 | error (_("Cannot find user-level thread for LWP %ld: %s"), |
dfd4cc63 | 405 | ptid_get_lwp (ptid), thread_db_err_str (err)); |
fb0e1ba7 | 406 | |
2db9a427 PA |
407 | err = info->td_thr_get_info_p (&th, &ti); |
408 | if (err != TD_OK) | |
409 | error (_("thread_get_info_callback: cannot get thread info: %s"), | |
410 | thread_db_err_str (err)); | |
411 | ||
412 | /* Fill the cache. */ | |
413 | tp = find_thread_ptid (ptid); | |
be550b6e | 414 | return record_thread (info, tp, ptid, &th, &ti); |
fb0e1ba7 MK |
415 | } |
416 | \f | |
417 | ||
2db9a427 PA |
418 | /* See linux-nat.h. */ |
419 | ||
4c28f408 | 420 | int |
2db9a427 | 421 | thread_db_notice_clone (ptid_t parent, ptid_t child) |
4c28f408 | 422 | { |
d90e17a7 | 423 | struct thread_db_info *info; |
4c28f408 | 424 | |
2db9a427 | 425 | info = get_thread_db_info (ptid_get_pid (child)); |
d90e17a7 PA |
426 | |
427 | if (info == NULL) | |
4c28f408 PA |
428 | return 0; |
429 | ||
2db9a427 | 430 | thread_from_lwp (child); |
4c28f408 | 431 | |
2db9a427 PA |
432 | /* If we do not know about the main thread yet, this would be a good |
433 | time to find it. */ | |
434 | thread_from_lwp (parent); | |
4c28f408 PA |
435 | return 1; |
436 | } | |
437 | ||
5220ea4c AC |
438 | static void * |
439 | verbose_dlsym (void *handle, const char *name) | |
440 | { | |
441 | void *sym = dlsym (handle, name); | |
442 | if (sym == NULL) | |
3e43a32a MS |
443 | warning (_("Symbol \"%s\" not found in libthread_db: %s"), |
444 | name, dlerror ()); | |
5220ea4c AC |
445 | return sym; |
446 | } | |
447 | ||
fcb44371 JK |
448 | /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and |
449 | return 1 if this version is lower (and not equal) to | |
450 | VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */ | |
451 | ||
452 | static int | |
453 | inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min) | |
454 | { | |
3b7344d5 | 455 | struct bound_minimal_symbol version_msym; |
fcb44371 | 456 | CORE_ADDR version_addr; |
e83e4e24 | 457 | gdb::unique_xmalloc_ptr<char> version; |
fcb44371 JK |
458 | int err, got, retval = 0; |
459 | ||
460 | version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL); | |
3b7344d5 | 461 | if (version_msym.minsym == NULL) |
fcb44371 JK |
462 | return 0; |
463 | ||
77e371c0 | 464 | version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym); |
fcb44371 | 465 | got = target_read_string (version_addr, &version, 32, &err); |
e83e4e24 | 466 | if (err == 0 && memchr (version.get (), 0, got) == version.get () + got - 1) |
fcb44371 JK |
467 | { |
468 | int major, minor; | |
469 | ||
e83e4e24 | 470 | retval = (sscanf (version.get (), "%d.%d", &major, &minor) == 2 |
fcb44371 JK |
471 | && (major < ver_major_min |
472 | || (major == ver_major_min && minor < ver_minor_min))); | |
473 | } | |
fcb44371 JK |
474 | |
475 | return retval; | |
476 | } | |
477 | ||
fcb44371 JK |
478 | /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors |
479 | if appropriate. | |
456b0e24 | 480 | |
fcb44371 JK |
481 | Return 1 if the caller should abort libthread_db initialization. Return 0 |
482 | otherwise. */ | |
483 | ||
484 | static int | |
456b0e24 PP |
485 | thread_db_find_new_threads_silently (ptid_t ptid) |
486 | { | |
456b0e24 | 487 | |
492d29ea | 488 | TRY |
456b0e24 | 489 | { |
02c6c942 | 490 | thread_db_find_new_threads_2 (ptid, 1); |
456b0e24 PP |
491 | } |
492 | ||
492d29ea | 493 | CATCH (except, RETURN_MASK_ERROR) |
e0881a8e | 494 | { |
fcb44371 | 495 | if (libthread_db_debug) |
883ed13e | 496 | exception_fprintf (gdb_stdlog, except, |
fcb44371 JK |
497 | "Warning: thread_db_find_new_threads_silently: "); |
498 | ||
499 | /* There is a bug fixed between nptl 2.6.1 and 2.7 by | |
500 | commit 7d9d8bd18906fdd17364f372b160d7ab896ce909 | |
501 | where calls to td_thr_get_info fail with TD_ERR for statically linked | |
502 | executables if td_thr_get_info is called before glibc has initialized | |
503 | itself. | |
504 | ||
505 | If the nptl bug is NOT present in the inferior and still thread_db | |
506 | reports an error return 1. It means the inferior has corrupted thread | |
507 | list and GDB should fall back only to LWPs. | |
508 | ||
509 | If the nptl bug is present in the inferior return 0 to silently ignore | |
510 | such errors, and let gdb enumerate threads again later. In such case | |
511 | GDB cannot properly display LWPs if the inferior thread list is | |
889003ed JK |
512 | corrupted. For core files it does not apply, no 'later enumeration' |
513 | is possible. */ | |
fcb44371 | 514 | |
889003ed | 515 | if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7)) |
fcb44371 JK |
516 | { |
517 | exception_fprintf (gdb_stderr, except, | |
518 | _("Warning: couldn't activate thread debugging " | |
519 | "using libthread_db: ")); | |
520 | return 1; | |
521 | } | |
e0881a8e | 522 | } |
492d29ea PA |
523 | END_CATCH |
524 | ||
fcb44371 | 525 | return 0; |
456b0e24 PP |
526 | } |
527 | ||
d90e17a7 PA |
528 | /* Lookup a library in which given symbol resides. |
529 | Note: this is looking in GDB process, not in the inferior. | |
530 | Returns library name, or NULL. */ | |
531 | ||
532 | static const char * | |
533 | dladdr_to_soname (const void *addr) | |
534 | { | |
535 | Dl_info info; | |
536 | ||
537 | if (dladdr (addr, &info) != 0) | |
538 | return info.dli_fname; | |
539 | return NULL; | |
540 | } | |
541 | ||
5045b3d7 GB |
542 | /* State for check_thread_db_callback. */ |
543 | ||
544 | struct check_thread_db_info | |
545 | { | |
546 | /* The libthread_db under test. */ | |
547 | struct thread_db_info *info; | |
548 | ||
549 | /* True if progress should be logged. */ | |
550 | bool log_progress; | |
551 | ||
552 | /* True if the callback was called. */ | |
553 | bool threads_seen; | |
554 | ||
555 | /* Name of last libthread_db function called. */ | |
556 | const char *last_call; | |
557 | ||
558 | /* Value returned by last libthread_db call. */ | |
559 | td_err_e last_result; | |
560 | }; | |
561 | ||
562 | static struct check_thread_db_info *tdb_testinfo; | |
563 | ||
564 | /* Callback for check_thread_db. */ | |
565 | ||
566 | static int | |
567 | check_thread_db_callback (const td_thrhandle_t *th, void *arg) | |
568 | { | |
569 | gdb_assert (tdb_testinfo != NULL); | |
570 | tdb_testinfo->threads_seen = true; | |
571 | ||
572 | #define LOG(fmt, args...) \ | |
573 | do \ | |
574 | { \ | |
575 | if (tdb_testinfo->log_progress) \ | |
576 | { \ | |
577 | debug_printf (fmt, ## args); \ | |
578 | gdb_flush (gdb_stdlog); \ | |
579 | } \ | |
580 | } \ | |
581 | while (0) | |
582 | ||
583 | #define CHECK_1(expr, args...) \ | |
584 | do \ | |
585 | { \ | |
586 | if (!(expr)) \ | |
587 | { \ | |
588 | LOG (" ... FAIL!\n"); \ | |
589 | error (args); \ | |
590 | } \ | |
591 | } \ | |
592 | while (0) | |
593 | ||
594 | #define CHECK(expr) \ | |
595 | CHECK_1 (expr, "(%s) == false", #expr) | |
596 | ||
597 | #define CALL_UNCHECKED(func, args...) \ | |
598 | do \ | |
599 | { \ | |
600 | tdb_testinfo->last_call = #func; \ | |
601 | tdb_testinfo->last_result \ | |
602 | = tdb_testinfo->info->func ## _p (args); \ | |
603 | } \ | |
604 | while (0) | |
605 | ||
606 | #define CHECK_CALL() \ | |
607 | CHECK_1 (tdb_testinfo->last_result == TD_OK, \ | |
608 | _("%s failed: %s"), \ | |
609 | tdb_testinfo->last_call, \ | |
610 | thread_db_err_str (tdb_testinfo->last_result)) \ | |
611 | ||
612 | #define CALL(func, args...) \ | |
613 | do \ | |
614 | { \ | |
615 | CALL_UNCHECKED (func, args); \ | |
616 | CHECK_CALL (); \ | |
617 | } \ | |
618 | while (0) | |
619 | ||
620 | LOG (" Got thread"); | |
621 | ||
622 | /* Check td_ta_thr_iter passed consistent arguments. */ | |
623 | CHECK (th != NULL); | |
624 | CHECK (arg == (void *) tdb_testinfo); | |
625 | CHECK (th->th_ta_p == tdb_testinfo->info->thread_agent); | |
626 | ||
627 | LOG (" %s", core_addr_to_string_nz ((CORE_ADDR) th->th_unique)); | |
628 | ||
629 | /* Check td_thr_get_info. */ | |
630 | td_thrinfo_t ti; | |
631 | CALL (td_thr_get_info, th, &ti); | |
632 | ||
633 | LOG (" => %d", ti.ti_lid); | |
634 | ||
635 | CHECK (ti.ti_ta_p == th->th_ta_p); | |
636 | CHECK (ti.ti_tid == (thread_t) th->th_unique); | |
637 | ||
638 | /* Check td_ta_map_lwp2thr. */ | |
639 | td_thrhandle_t th2; | |
640 | memset (&th2, 23, sizeof (td_thrhandle_t)); | |
641 | CALL_UNCHECKED (td_ta_map_lwp2thr, th->th_ta_p, ti.ti_lid, &th2); | |
642 | ||
643 | if (tdb_testinfo->last_result == TD_ERR && !target_has_execution) | |
644 | { | |
645 | /* Some platforms require execution for td_ta_map_lwp2thr. */ | |
646 | LOG (_("; can't map_lwp2thr")); | |
647 | } | |
648 | else | |
649 | { | |
650 | CHECK_CALL (); | |
651 | ||
652 | LOG (" => %s", core_addr_to_string_nz ((CORE_ADDR) th2.th_unique)); | |
653 | ||
654 | CHECK (memcmp (th, &th2, sizeof (td_thrhandle_t)) == 0); | |
655 | } | |
656 | ||
657 | /* Attempt TLS access. Assuming errno is TLS, this calls | |
658 | thread_db_get_thread_local_address, which in turn calls | |
659 | td_thr_tls_get_addr for live inferiors or td_thr_tlsbase | |
660 | for core files. This test is skipped if the thread has | |
661 | not been recorded; proceeding in that case would result | |
662 | in the test having the side-effect of noticing threads | |
663 | which seems wrong. | |
664 | ||
665 | Note that in glibc's libthread_db td_thr_tls_get_addr is | |
666 | a thin wrapper around td_thr_tlsbase; this check always | |
667 | hits the bulk of the code. | |
668 | ||
669 | Note also that we don't actually check any libthread_db | |
670 | calls are made, we just assume they were; future changes | |
671 | to how GDB accesses TLS could result in this passing | |
672 | without exercising the calls it's supposed to. */ | |
673 | ptid_t ptid = ptid_build (tdb_testinfo->info->pid, ti.ti_lid, 0); | |
674 | struct thread_info *thread_info = find_thread_ptid (ptid); | |
675 | if (thread_info != NULL && thread_info->priv != NULL) | |
676 | { | |
677 | LOG ("; errno"); | |
678 | ||
679 | scoped_restore_current_thread restore_current_thread; | |
680 | switch_to_thread (ptid); | |
681 | ||
682 | expression_up expr = parse_expression ("(int) errno"); | |
683 | struct value *val = evaluate_expression (expr.get ()); | |
684 | ||
685 | if (tdb_testinfo->log_progress) | |
686 | { | |
687 | struct value_print_options opts; | |
688 | ||
689 | get_user_print_options (&opts); | |
690 | LOG (" = "); | |
691 | value_print (val, gdb_stdlog, &opts); | |
692 | } | |
693 | } | |
694 | ||
695 | LOG (" ... OK\n"); | |
696 | ||
697 | #undef LOG | |
698 | #undef CHECK_1 | |
699 | #undef CHECK | |
700 | #undef CALL_UNCHECKED | |
701 | #undef CHECK_CALL | |
702 | #undef CALL | |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
707 | /* Run integrity checks on the dlopen()ed libthread_db described by | |
708 | INFO. Returns true on success, displays a warning and returns | |
709 | false on failure. Logs progress messages to gdb_stdlog during | |
710 | the test if LOG_PROGRESS is true. */ | |
711 | ||
712 | static bool | |
713 | check_thread_db (struct thread_db_info *info, bool log_progress) | |
714 | { | |
715 | bool test_passed = true; | |
716 | ||
717 | if (log_progress) | |
718 | debug_printf (_("Running libthread_db integrity checks:\n")); | |
719 | ||
720 | /* GDB avoids using td_ta_thr_iter wherever possible (see comment | |
721 | in try_thread_db_load_1 below) so in order to test it we may | |
722 | have to locate it ourselves. */ | |
723 | td_ta_thr_iter_ftype *td_ta_thr_iter_p = info->td_ta_thr_iter_p; | |
724 | if (td_ta_thr_iter_p == NULL) | |
725 | { | |
726 | void *thr_iter = verbose_dlsym (info->handle, "td_ta_thr_iter"); | |
727 | if (thr_iter == NULL) | |
728 | return 0; | |
729 | ||
730 | td_ta_thr_iter_p = (td_ta_thr_iter_ftype *) thr_iter; | |
731 | } | |
732 | ||
733 | /* Set up the test state we share with the callback. */ | |
734 | gdb_assert (tdb_testinfo == NULL); | |
735 | struct check_thread_db_info tdb_testinfo_buf; | |
736 | tdb_testinfo = &tdb_testinfo_buf; | |
737 | ||
738 | memset (tdb_testinfo, 0, sizeof (struct check_thread_db_info)); | |
739 | tdb_testinfo->info = info; | |
740 | tdb_testinfo->log_progress = log_progress; | |
741 | ||
742 | /* td_ta_thr_iter shouldn't be used on running processes. Note that | |
743 | it's possible the inferior will stop midway through modifying one | |
744 | of its thread lists, in which case the check will spuriously | |
745 | fail. */ | |
746 | linux_stop_and_wait_all_lwps (); | |
747 | ||
748 | TRY | |
749 | { | |
750 | td_err_e err = td_ta_thr_iter_p (info->thread_agent, | |
751 | check_thread_db_callback, | |
752 | tdb_testinfo, | |
753 | TD_THR_ANY_STATE, | |
754 | TD_THR_LOWEST_PRIORITY, | |
755 | TD_SIGNO_MASK, | |
756 | TD_THR_ANY_USER_FLAGS); | |
757 | ||
758 | if (err != TD_OK) | |
759 | error (_("td_ta_thr_iter failed: %s"), thread_db_err_str (err)); | |
760 | ||
761 | if (!tdb_testinfo->threads_seen) | |
762 | error (_("no threads seen")); | |
763 | } | |
764 | CATCH (except, RETURN_MASK_ERROR) | |
765 | { | |
766 | if (warning_pre_print) | |
767 | fputs_unfiltered (warning_pre_print, gdb_stderr); | |
768 | ||
769 | exception_fprintf (gdb_stderr, except, | |
770 | _("libthread_db integrity checks failed: ")); | |
771 | ||
772 | test_passed = false; | |
773 | } | |
774 | END_CATCH | |
775 | ||
776 | if (test_passed && log_progress) | |
777 | debug_printf (_("libthread_db integrity checks passed.\n")); | |
778 | ||
779 | tdb_testinfo = NULL; | |
780 | ||
781 | linux_unstop_all_lwps (); | |
782 | ||
783 | return test_passed; | |
784 | } | |
785 | ||
2471d008 | 786 | /* Attempt to initialize dlopen()ed libthread_db, described by INFO. |
17a37d48 PP |
787 | Return 1 on success. |
788 | Failure could happen if libthread_db does not have symbols we expect, | |
789 | or when it refuses to work with the current inferior (e.g. due to | |
790 | version mismatch between libthread_db and libpthread). */ | |
791 | ||
792 | static int | |
d90e17a7 | 793 | try_thread_db_load_1 (struct thread_db_info *info) |
17a37d48 PP |
794 | { |
795 | td_err_e err; | |
796 | ||
797 | /* Initialize pointers to the dynamic library functions we will use. | |
798 | Essential functions first. */ | |
799 | ||
96e9210f PA |
800 | #define TDB_VERBOSE_DLSYM(info, func) \ |
801 | info->func ## _p = (func ## _ftype *) verbose_dlsym (info->handle, #func) | |
802 | ||
803 | #define TDB_DLSYM(info, func) \ | |
804 | info->func ## _p = (func ## _ftype *) dlsym (info->handle, #func) | |
805 | ||
806 | #define CHK(a) \ | |
807 | do \ | |
808 | { \ | |
809 | if ((a) == NULL) \ | |
810 | return 0; \ | |
811 | } while (0) | |
812 | ||
813 | CHK (TDB_VERBOSE_DLSYM (info, td_init)); | |
17a37d48 | 814 | |
d90e17a7 | 815 | err = info->td_init_p (); |
17a37d48 PP |
816 | if (err != TD_OK) |
817 | { | |
3e43a32a MS |
818 | warning (_("Cannot initialize libthread_db: %s"), |
819 | thread_db_err_str (err)); | |
17a37d48 PP |
820 | return 0; |
821 | } | |
822 | ||
96e9210f | 823 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_new)); |
17a37d48 PP |
824 | |
825 | /* Initialize the structure that identifies the child process. */ | |
d90e17a7 | 826 | info->proc_handle.ptid = inferior_ptid; |
17a37d48 PP |
827 | |
828 | /* Now attempt to open a connection to the thread library. */ | |
d90e17a7 | 829 | err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent); |
17a37d48 PP |
830 | if (err != TD_OK) |
831 | { | |
02d868e8 | 832 | if (libthread_db_debug) |
883ed13e PA |
833 | fprintf_unfiltered (gdb_stdlog, _("td_ta_new failed: %s\n"), |
834 | thread_db_err_str (err)); | |
17a37d48 PP |
835 | else |
836 | switch (err) | |
837 | { | |
838 | case TD_NOLIBTHREAD: | |
839 | #ifdef THREAD_DB_HAS_TD_VERSION | |
840 | case TD_VERSION: | |
841 | #endif | |
842 | /* The errors above are not unexpected and silently ignored: | |
843 | they just mean we haven't found correct version of | |
844 | libthread_db yet. */ | |
845 | break; | |
846 | default: | |
847 | warning (_("td_ta_new failed: %s"), thread_db_err_str (err)); | |
848 | } | |
849 | return 0; | |
850 | } | |
851 | ||
96e9210f PA |
852 | /* These are essential. */ |
853 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_map_lwp2thr)); | |
96e9210f | 854 | CHK (TDB_VERBOSE_DLSYM (info, td_thr_get_info)); |
17a37d48 PP |
855 | |
856 | /* These are not essential. */ | |
96e9210f PA |
857 | TDB_DLSYM (info, td_thr_tls_get_addr); |
858 | TDB_DLSYM (info, td_thr_tlsbase); | |
859 | ||
2db9a427 PA |
860 | /* It's best to avoid td_ta_thr_iter if possible. That walks data |
861 | structures in the inferior's address space that may be corrupted, | |
862 | or, if the target is running, may change while we walk them. If | |
863 | there's execution (and /proc is mounted), then we're already | |
864 | attached to all LWPs. Use thread_from_lwp, which uses | |
865 | td_ta_map_lwp2thr instead, which does not walk the thread list. | |
866 | ||
867 | td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that | |
868 | currently on core targets, as it uses ptrace directly. */ | |
869 | if (target_has_execution | |
870 | && linux_proc_task_list_dir_exists (ptid_get_pid (inferior_ptid))) | |
1eb2dbb8 PA |
871 | info->td_ta_thr_iter_p = NULL; |
872 | else | |
873 | CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter)); | |
874 | ||
875 | #undef TDB_VERBOSE_DLSYM | |
876 | #undef TDB_DLSYM | |
877 | #undef CHK | |
878 | ||
5045b3d7 GB |
879 | /* Run integrity checks if requested. */ |
880 | if (check_thread_db_on_load) | |
881 | { | |
882 | if (!check_thread_db (info, libthread_db_debug)) | |
883 | return 0; | |
884 | } | |
885 | ||
1eb2dbb8 | 886 | if (info->td_ta_thr_iter_p == NULL) |
2db9a427 PA |
887 | { |
888 | struct lwp_info *lp; | |
889 | int pid = ptid_get_pid (inferior_ptid); | |
890 | ||
891 | linux_stop_and_wait_all_lwps (); | |
892 | ||
893 | ALL_LWPS (lp) | |
894 | if (ptid_get_pid (lp->ptid) == pid) | |
895 | thread_from_lwp (lp->ptid); | |
896 | ||
897 | linux_unstop_all_lwps (); | |
898 | } | |
899 | else if (thread_db_find_new_threads_silently (inferior_ptid) != 0) | |
fcb44371 JK |
900 | { |
901 | /* Even if libthread_db initializes, if the thread list is | |
902 | corrupted, we'd not manage to list any threads. Better reject this | |
903 | thread_db, and fall back to at least listing LWPs. */ | |
904 | return 0; | |
905 | } | |
906 | ||
17a37d48 PP |
907 | printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n")); |
908 | ||
883ed13e | 909 | if (*libthread_db_search_path || libthread_db_debug) |
d90e17a7 | 910 | { |
883ed13e | 911 | struct ui_file *file; |
d90e17a7 | 912 | const char *library; |
17a37d48 | 913 | |
f8708a14 | 914 | library = dladdr_to_soname ((const void *) *info->td_ta_new_p); |
d90e17a7 PA |
915 | if (library == NULL) |
916 | library = LIBTHREAD_DB_SO; | |
17a37d48 | 917 | |
883ed13e PA |
918 | /* If we'd print this to gdb_stdout when debug output is |
919 | disabled, still print it to gdb_stdout if debug output is | |
920 | enabled. User visible output should not depend on debug | |
921 | settings. */ | |
922 | file = *libthread_db_search_path != '\0' ? gdb_stdout : gdb_stdlog; | |
923 | fprintf_unfiltered (file, _("Using host libthread_db library \"%s\".\n"), | |
924 | library); | |
d90e17a7 | 925 | } |
17a37d48 | 926 | |
d90e17a7 PA |
927 | /* The thread library was detected. Activate the thread_db target |
928 | if this is the first process using it. */ | |
929 | if (thread_db_list->next == NULL) | |
f6ac5f3d | 930 | push_target (&the_thread_db_target); |
17a37d48 | 931 | |
d90e17a7 | 932 | return 1; |
17a37d48 PP |
933 | } |
934 | ||
935 | /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute, | |
936 | relative, or just LIBTHREAD_DB. */ | |
937 | ||
938 | static int | |
fde4f8ed | 939 | try_thread_db_load (const char *library, int check_auto_load_safe) |
17a37d48 PP |
940 | { |
941 | void *handle; | |
d90e17a7 | 942 | struct thread_db_info *info; |
17a37d48 | 943 | |
02d868e8 | 944 | if (libthread_db_debug) |
883ed13e PA |
945 | fprintf_unfiltered (gdb_stdlog, |
946 | _("Trying host libthread_db library: %s.\n"), | |
947 | library); | |
fde4f8ed JK |
948 | |
949 | if (check_auto_load_safe) | |
950 | { | |
951 | if (access (library, R_OK) != 0) | |
952 | { | |
953 | /* Do not print warnings by file_is_auto_load_safe if the library does | |
954 | not exist at this place. */ | |
955 | if (libthread_db_debug) | |
883ed13e PA |
956 | fprintf_unfiltered (gdb_stdlog, _("open failed: %s.\n"), |
957 | safe_strerror (errno)); | |
fde4f8ed JK |
958 | return 0; |
959 | } | |
960 | ||
961 | if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db " | |
962 | "library \"%s\" from explicit " | |
963 | "directory.\n"), | |
964 | library)) | |
965 | return 0; | |
966 | } | |
967 | ||
17a37d48 PP |
968 | handle = dlopen (library, RTLD_NOW); |
969 | if (handle == NULL) | |
970 | { | |
02d868e8 | 971 | if (libthread_db_debug) |
883ed13e | 972 | fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ()); |
17a37d48 PP |
973 | return 0; |
974 | } | |
975 | ||
02d868e8 | 976 | if (libthread_db_debug && strchr (library, '/') == NULL) |
17a37d48 PP |
977 | { |
978 | void *td_init; | |
979 | ||
980 | td_init = dlsym (handle, "td_init"); | |
981 | if (td_init != NULL) | |
982 | { | |
983 | const char *const libpath = dladdr_to_soname (td_init); | |
984 | ||
985 | if (libpath != NULL) | |
883ed13e | 986 | fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"), |
17a37d48 PP |
987 | library, libpath); |
988 | } | |
989 | } | |
990 | ||
d90e17a7 PA |
991 | info = add_thread_db_info (handle); |
992 | ||
bf88dd68 JK |
993 | /* Do not save system library name, that one is always trusted. */ |
994 | if (strchr (library, '/') != NULL) | |
14278e1f | 995 | info->filename = gdb_realpath (library).release (); |
bf88dd68 | 996 | |
d90e17a7 | 997 | if (try_thread_db_load_1 (info)) |
17a37d48 PP |
998 | return 1; |
999 | ||
1000 | /* This library "refused" to work on current inferior. */ | |
dfd4cc63 | 1001 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
17a37d48 PP |
1002 | return 0; |
1003 | } | |
1004 | ||
290351b8 | 1005 | /* Subroutine of try_thread_db_load_from_pdir to simplify it. |
e6712ff1 DE |
1006 | Try loading libthread_db in directory(OBJ)/SUBDIR. |
1007 | SUBDIR may be NULL. It may also be something like "../lib64". | |
290351b8 DE |
1008 | The result is true for success. */ |
1009 | ||
1010 | static int | |
e6712ff1 | 1011 | try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir) |
290351b8 | 1012 | { |
4262abfb | 1013 | const char *obj_name = objfile_name (obj); |
290351b8 | 1014 | |
4262abfb | 1015 | if (obj_name[0] != '/') |
290351b8 DE |
1016 | { |
1017 | warning (_("Expected absolute pathname for libpthread in the" | |
4262abfb | 1018 | " inferior, but got %s."), obj_name); |
290351b8 DE |
1019 | return 0; |
1020 | } | |
05386e9e | 1021 | |
9b292f68 TT |
1022 | std::string path = obj_name; |
1023 | size_t cp = path.rfind ('/'); | |
05386e9e | 1024 | /* This should at minimum hit the first character. */ |
9b292f68 TT |
1025 | gdb_assert (cp != std::string::npos); |
1026 | path.resize (cp + 1); | |
e6712ff1 | 1027 | if (subdir != NULL) |
9b292f68 TT |
1028 | path = path + subdir + "/"; |
1029 | path += LIBTHREAD_DB_SO; | |
bccbefd2 | 1030 | |
9b292f68 | 1031 | return try_thread_db_load (path.c_str (), 1); |
290351b8 DE |
1032 | } |
1033 | ||
98a5dd13 | 1034 | /* Handle $pdir in libthread-db-search-path. |
e6712ff1 DE |
1035 | Look for libthread_db in directory(libpthread)/SUBDIR. |
1036 | SUBDIR may be NULL. It may also be something like "../lib64". | |
98a5dd13 DE |
1037 | The result is true for success. */ |
1038 | ||
1039 | static int | |
e6712ff1 | 1040 | try_thread_db_load_from_pdir (const char *subdir) |
98a5dd13 DE |
1041 | { |
1042 | struct objfile *obj; | |
1043 | ||
bf88dd68 JK |
1044 | if (!auto_load_thread_db) |
1045 | return 0; | |
1046 | ||
98a5dd13 | 1047 | ALL_OBJFILES (obj) |
4262abfb | 1048 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 | 1049 | { |
e6712ff1 | 1050 | if (try_thread_db_load_from_pdir_1 (obj, subdir)) |
290351b8 DE |
1051 | return 1; |
1052 | ||
1053 | /* We may have found the separate-debug-info version of | |
1054 | libpthread, and it may live in a directory without a matching | |
1055 | libthread_db. */ | |
1056 | if (obj->separate_debug_objfile_backlink != NULL) | |
e6712ff1 DE |
1057 | return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink, |
1058 | subdir); | |
290351b8 | 1059 | |
98a5dd13 DE |
1060 | return 0; |
1061 | } | |
1062 | ||
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | /* Handle $sdir in libthread-db-search-path. | |
1067 | Look for libthread_db in the system dirs, or wherever a plain | |
1068 | dlopen(file_without_path) will look. | |
1069 | The result is true for success. */ | |
1070 | ||
1071 | static int | |
1072 | try_thread_db_load_from_sdir (void) | |
1073 | { | |
fde4f8ed | 1074 | return try_thread_db_load (LIBTHREAD_DB_SO, 0); |
98a5dd13 DE |
1075 | } |
1076 | ||
1077 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
1078 | The result is true for success. */ | |
1079 | ||
1080 | static int | |
1081 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
1082 | { | |
bf88dd68 JK |
1083 | if (!auto_load_thread_db) |
1084 | return 0; | |
1085 | ||
9b292f68 | 1086 | std::string path = std::string (dir, dir_len) + "/" + LIBTHREAD_DB_SO; |
bccbefd2 | 1087 | |
9b292f68 | 1088 | return try_thread_db_load (path.c_str (), 1); |
98a5dd13 DE |
1089 | } |
1090 | ||
17a37d48 | 1091 | /* Search libthread_db_search_path for libthread_db which "agrees" |
98a5dd13 DE |
1092 | to work on current inferior. |
1093 | The result is true for success. */ | |
17a37d48 PP |
1094 | |
1095 | static int | |
1096 | thread_db_load_search (void) | |
1097 | { | |
e80aaf61 | 1098 | int rc = 0; |
17a37d48 | 1099 | |
e80aaf61 SM |
1100 | std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec |
1101 | = dirnames_to_char_ptr_vec (libthread_db_search_path); | |
e6712ff1 | 1102 | |
e80aaf61 | 1103 | for (const gdb::unique_xmalloc_ptr<char> &this_dir_up : dir_vec) |
17a37d48 | 1104 | { |
e80aaf61 | 1105 | const char *this_dir = this_dir_up.get (); |
e6712ff1 | 1106 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 | 1107 | size_t this_dir_len; |
e0881a8e | 1108 | |
e6712ff1 | 1109 | this_dir_len = strlen (this_dir); |
17a37d48 | 1110 | |
e6712ff1 DE |
1111 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
1112 | && (this_dir[pdir_len] == '\0' | |
1113 | || this_dir[pdir_len] == '/')) | |
98a5dd13 | 1114 | { |
9b292f68 | 1115 | const char *subdir = NULL; |
e6712ff1 | 1116 | |
9b292f68 | 1117 | std::string subdir_holder; |
e6712ff1 | 1118 | if (this_dir[pdir_len] == '/') |
98a5dd13 | 1119 | { |
9b292f68 TT |
1120 | subdir_holder = std::string (this_dir + pdir_len + 1); |
1121 | subdir = subdir_holder.c_str (); | |
98a5dd13 | 1122 | } |
e6712ff1 | 1123 | rc = try_thread_db_load_from_pdir (subdir); |
e6712ff1 DE |
1124 | if (rc) |
1125 | break; | |
17a37d48 | 1126 | } |
e6712ff1 | 1127 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
1128 | { |
1129 | if (try_thread_db_load_from_sdir ()) | |
1130 | { | |
1131 | rc = 1; | |
1132 | break; | |
1133 | } | |
1134 | } | |
1135 | else | |
17a37d48 | 1136 | { |
98a5dd13 DE |
1137 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
1138 | { | |
1139 | rc = 1; | |
1140 | break; | |
1141 | } | |
17a37d48 PP |
1142 | } |
1143 | } | |
98a5dd13 DE |
1144 | |
1145 | if (libthread_db_debug) | |
883ed13e PA |
1146 | fprintf_unfiltered (gdb_stdlog, |
1147 | _("thread_db_load_search returning %d\n"), rc); | |
17a37d48 PP |
1148 | return rc; |
1149 | } | |
1150 | ||
98a5dd13 DE |
1151 | /* Return non-zero if the inferior has a libpthread. */ |
1152 | ||
1153 | static int | |
1154 | has_libpthread (void) | |
1155 | { | |
1156 | struct objfile *obj; | |
1157 | ||
1158 | ALL_OBJFILES (obj) | |
4262abfb | 1159 | if (libpthread_name_p (objfile_name (obj))) |
98a5dd13 DE |
1160 | return 1; |
1161 | ||
1162 | return 0; | |
1163 | } | |
1164 | ||
17a37d48 | 1165 | /* Attempt to load and initialize libthread_db. |
1777feb0 | 1166 | Return 1 on success. */ |
17a37d48 PP |
1167 | |
1168 | static int | |
1169 | thread_db_load (void) | |
1170 | { | |
d90e17a7 | 1171 | struct thread_db_info *info; |
17a37d48 | 1172 | |
dfd4cc63 | 1173 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
d90e17a7 PA |
1174 | |
1175 | if (info != NULL) | |
17a37d48 PP |
1176 | return 1; |
1177 | ||
856d6f99 PA |
1178 | /* Don't attempt to use thread_db on executables not running |
1179 | yet. */ | |
1180 | if (!target_has_registers) | |
17a37d48 PP |
1181 | return 0; |
1182 | ||
1183 | /* Don't attempt to use thread_db for remote targets. */ | |
f6ac5f3d | 1184 | if (!(target_can_run () || core_bfd)) |
17a37d48 PP |
1185 | return 0; |
1186 | ||
1187 | if (thread_db_load_search ()) | |
1188 | return 1; | |
1189 | ||
98a5dd13 DE |
1190 | /* We couldn't find a libthread_db. |
1191 | If the inferior has a libpthread warn the user. */ | |
1192 | if (has_libpthread ()) | |
1193 | { | |
1194 | warning (_("Unable to find libthread_db matching inferior's thread" | |
1195 | " library, thread debugging will not be available.")); | |
1196 | return 0; | |
17a37d48 | 1197 | } |
98a5dd13 | 1198 | |
17a37d48 PP |
1199 | /* Either this executable isn't using libpthread at all, or it is |
1200 | statically linked. Since we can't easily distinguish these two cases, | |
1201 | no warning is issued. */ | |
1202 | return 0; | |
1203 | } | |
1204 | ||
fb0e1ba7 MK |
1205 | static void |
1206 | check_thread_signals (void) | |
1207 | { | |
21bf60fe | 1208 | if (!thread_signals) |
fb0e1ba7 MK |
1209 | { |
1210 | sigset_t mask; | |
1211 | int i; | |
1212 | ||
669211f5 | 1213 | lin_thread_get_thread_signals (&mask); |
fb0e1ba7 MK |
1214 | sigemptyset (&thread_stop_set); |
1215 | sigemptyset (&thread_print_set); | |
1216 | ||
b9569773 | 1217 | for (i = 1; i < NSIG; i++) |
fb0e1ba7 MK |
1218 | { |
1219 | if (sigismember (&mask, i)) | |
1220 | { | |
2ea28649 | 1221 | if (signal_stop_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 | 1222 | sigaddset (&thread_stop_set, i); |
2ea28649 | 1223 | if (signal_print_update (gdb_signal_from_host (i), 0)) |
fb0e1ba7 MK |
1224 | sigaddset (&thread_print_set, i); |
1225 | thread_signals = 1; | |
1226 | } | |
1227 | } | |
1228 | } | |
fb0e1ba7 MK |
1229 | } |
1230 | ||
0ec9a092 DJ |
1231 | /* Check whether thread_db is usable. This function is called when |
1232 | an inferior is created (or otherwise acquired, e.g. attached to) | |
1233 | and when new shared libraries are loaded into a running process. */ | |
1234 | ||
1235 | void | |
1236 | check_for_thread_db (void) | |
fb0e1ba7 | 1237 | { |
b5057acd | 1238 | /* Do nothing if we couldn't load libthread_db.so.1. */ |
17a37d48 | 1239 | if (!thread_db_load ()) |
b5057acd | 1240 | return; |
0ec9a092 DJ |
1241 | } |
1242 | ||
0838fb57 DE |
1243 | /* This function is called via the new_objfile observer. */ |
1244 | ||
0ec9a092 DJ |
1245 | static void |
1246 | thread_db_new_objfile (struct objfile *objfile) | |
1247 | { | |
d90e17a7 PA |
1248 | /* This observer must always be called with inferior_ptid set |
1249 | correctly. */ | |
1250 | ||
0838fb57 | 1251 | if (objfile != NULL |
fcb44371 | 1252 | /* libpthread with separate debug info has its debug info file already |
7d0e21ad | 1253 | loaded (and notified without successful thread_db initialization) |
76727919 | 1254 | the time gdb::observers::new_objfile.notify is called for the library itself. |
fcb44371 JK |
1255 | Static executables have their separate debug info loaded already |
1256 | before the inferior has started. */ | |
1257 | && objfile->separate_debug_objfile_backlink == NULL | |
0838fb57 DE |
1258 | /* Only check for thread_db if we loaded libpthread, |
1259 | or if this is the main symbol file. | |
1260 | We need to check OBJF_MAINLINE to handle the case of debugging | |
1261 | a statically linked executable AND the symbol file is specified AFTER | |
1262 | the exec file is loaded (e.g., gdb -c core ; file foo). | |
1263 | For dynamically linked executables, libpthread can be near the end | |
1264 | of the list of shared libraries to load, and in an app of several | |
1265 | thousand shared libraries, this can otherwise be painful. */ | |
1266 | && ((objfile->flags & OBJF_MAINLINE) != 0 | |
4262abfb | 1267 | || libpthread_name_p (objfile_name (objfile)))) |
0ec9a092 | 1268 | check_for_thread_db (); |
fb0e1ba7 MK |
1269 | } |
1270 | ||
015de688 DC |
1271 | static void |
1272 | check_pid_namespace_match (void) | |
1273 | { | |
1274 | /* Check is only relevant for local targets targets. */ | |
f6ac5f3d | 1275 | if (target_can_run ()) |
015de688 DC |
1276 | { |
1277 | /* If the child is in a different PID namespace, its idea of its | |
1278 | PID will differ from our idea of its PID. When we scan the | |
1279 | child's thread list, we'll mistakenly think it has no threads | |
1280 | since the thread PID fields won't match the PID we give to | |
1281 | libthread_db. */ | |
9bc3a976 | 1282 | if (!linux_ns_same (ptid_get_pid (inferior_ptid), LINUX_NS_PID)) |
015de688 DC |
1283 | { |
1284 | warning (_ ("Target and debugger are in different PID " | |
1285 | "namespaces; thread lists and other data are " | |
708bf0a1 JK |
1286 | "likely unreliable. " |
1287 | "Connect to gdbserver inside the container.")); | |
015de688 | 1288 | } |
015de688 DC |
1289 | } |
1290 | } | |
1291 | ||
0838fb57 DE |
1292 | /* This function is called via the inferior_created observer. |
1293 | This handles the case of debugging statically linked executables. */ | |
1294 | ||
1295 | static void | |
1296 | thread_db_inferior_created (struct target_ops *target, int from_tty) | |
1297 | { | |
015de688 | 1298 | check_pid_namespace_match (); |
0838fb57 DE |
1299 | check_for_thread_db (); |
1300 | } | |
1301 | ||
c1a747c1 PA |
1302 | /* Update the thread's state (what's displayed in "info threads"), |
1303 | from libthread_db thread state information. */ | |
1304 | ||
1305 | static void | |
7aabaf9d | 1306 | update_thread_state (thread_db_thread_info *priv, |
c1a747c1 PA |
1307 | const td_thrinfo_t *ti_p) |
1308 | { | |
fe978cb0 PA |
1309 | priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN |
1310 | || ti_p->ti_state == TD_THR_ZOMBIE); | |
c1a747c1 PA |
1311 | } |
1312 | ||
2db9a427 | 1313 | /* Record a new thread in GDB's thread list. Creates the thread's |
be550b6e DE |
1314 | private info. If TP is NULL or TP is marked as having exited, |
1315 | creates a new thread. Otherwise, uses TP. */ | |
2db9a427 | 1316 | |
be550b6e | 1317 | static struct thread_info * |
2db9a427 PA |
1318 | record_thread (struct thread_db_info *info, |
1319 | struct thread_info *tp, | |
1320 | ptid_t ptid, const td_thrhandle_t *th_p, | |
1321 | const td_thrinfo_t *ti_p) | |
1322 | { | |
2db9a427 PA |
1323 | /* A thread ID of zero may mean the thread library has not |
1324 | initialized yet. Leave private == NULL until the thread library | |
1325 | has initialized. */ | |
1326 | if (ti_p->ti_tid == 0) | |
be550b6e | 1327 | return tp; |
2db9a427 | 1328 | |
17faa917 | 1329 | /* Construct the thread's private data. */ |
7aabaf9d | 1330 | thread_db_thread_info *priv = new thread_db_thread_info; |
17faa917 | 1331 | |
fe978cb0 PA |
1332 | priv->th = *th_p; |
1333 | priv->tid = ti_p->ti_tid; | |
1334 | update_thread_state (priv, ti_p); | |
17faa917 | 1335 | |
4eec2deb PA |
1336 | /* Add the thread to GDB's thread list. If we already know about a |
1337 | thread with this PTID, but it's marked exited, then the kernel | |
1338 | reused the tid of an old thread. */ | |
1339 | if (tp == NULL || tp->state == THREAD_EXITED) | |
fe978cb0 | 1340 | tp = add_thread_with_info (ptid, priv); |
17faa917 | 1341 | else |
7aabaf9d | 1342 | tp->priv.reset (priv); |
5365276c | 1343 | |
2db9a427 PA |
1344 | if (target_has_execution) |
1345 | check_thread_signals (); | |
be550b6e DE |
1346 | |
1347 | return tp; | |
fb0e1ba7 MK |
1348 | } |
1349 | ||
f6ac5f3d PA |
1350 | void |
1351 | thread_db_target::detach (inferior *inf, int from_tty) | |
fb0e1ba7 | 1352 | { |
bc09b0c1 | 1353 | delete_thread_db_info (inf->pid); |
4105de34 | 1354 | |
d6ca69cd | 1355 | beneath ()->detach (inf, from_tty); |
d90e17a7 PA |
1356 | |
1357 | /* NOTE: From this point on, inferior_ptid is null_ptid. */ | |
1358 | ||
1359 | /* If there are no more processes using libpthread, detach the | |
1360 | thread_db target ops. */ | |
1361 | if (!thread_db_list) | |
f6ac5f3d | 1362 | unpush_target (this); |
fb0e1ba7 MK |
1363 | } |
1364 | ||
f6ac5f3d PA |
1365 | ptid_t |
1366 | thread_db_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
1367 | int options) | |
fb0e1ba7 | 1368 | { |
d90e17a7 | 1369 | struct thread_db_info *info; |
117de6a9 | 1370 | |
d6ca69cd | 1371 | ptid = beneath ()->wait (ptid, ourstatus, options); |
fb0e1ba7 | 1372 | |
aa01bd36 PA |
1373 | switch (ourstatus->kind) |
1374 | { | |
1375 | case TARGET_WAITKIND_IGNORE: | |
1376 | case TARGET_WAITKIND_EXITED: | |
1377 | case TARGET_WAITKIND_THREAD_EXITED: | |
1378 | case TARGET_WAITKIND_SIGNALLED: | |
1379 | return ptid; | |
1380 | } | |
fb0e1ba7 | 1381 | |
dfd4cc63 | 1382 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 PA |
1383 | |
1384 | /* If this process isn't using thread_db, we're done. */ | |
1385 | if (info == NULL) | |
1386 | return ptid; | |
1387 | ||
3f64f7b1 DJ |
1388 | if (ourstatus->kind == TARGET_WAITKIND_EXECD) |
1389 | { | |
d90e17a7 PA |
1390 | /* New image, it may or may not end up using thread_db. Assume |
1391 | not unless we find otherwise. */ | |
dfd4cc63 | 1392 | delete_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1393 | if (!thread_db_list) |
f6ac5f3d | 1394 | unpush_target (&the_thread_db_target); |
3f64f7b1 | 1395 | |
49fd4a42 | 1396 | return ptid; |
3f64f7b1 DJ |
1397 | } |
1398 | ||
2db9a427 PA |
1399 | /* Fill in the thread's user-level thread id and status. */ |
1400 | thread_from_lwp (ptid); | |
fb0e1ba7 | 1401 | |
b9b5d7ea | 1402 | return ptid; |
fb0e1ba7 MK |
1403 | } |
1404 | ||
f6ac5f3d PA |
1405 | void |
1406 | thread_db_target::mourn_inferior () | |
fb0e1ba7 | 1407 | { |
dfd4cc63 | 1408 | delete_thread_db_info (ptid_get_pid (inferior_ptid)); |
fb0e1ba7 | 1409 | |
d6ca69cd | 1410 | beneath ()->mourn_inferior (); |
d90e17a7 | 1411 | |
b26a6851 | 1412 | /* Detach thread_db target ops. */ |
d90e17a7 | 1413 | if (!thread_db_list) |
f6ac5f3d | 1414 | unpush_target (&the_thread_db_target); |
fb0e1ba7 MK |
1415 | } |
1416 | ||
02c6c942 PP |
1417 | struct callback_data |
1418 | { | |
1419 | struct thread_db_info *info; | |
1420 | int new_threads; | |
1421 | }; | |
1422 | ||
fb0e1ba7 MK |
1423 | static int |
1424 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
1425 | { | |
1426 | td_thrinfo_t ti; | |
1427 | td_err_e err; | |
39f77062 | 1428 | ptid_t ptid; |
403fe197 | 1429 | struct thread_info *tp; |
9a3c8263 | 1430 | struct callback_data *cb_data = (struct callback_data *) data; |
02c6c942 | 1431 | struct thread_db_info *info = cb_data->info; |
fb0e1ba7 | 1432 | |
d90e17a7 | 1433 | err = info->td_thr_get_info_p (th_p, &ti); |
fb0e1ba7 | 1434 | if (err != TD_OK) |
8a3fe4f8 | 1435 | error (_("find_new_threads_callback: cannot get thread info: %s"), |
3197744f | 1436 | thread_db_err_str (err)); |
fb0e1ba7 | 1437 | |
a33e3959 PA |
1438 | if (ti.ti_lid == -1) |
1439 | { | |
1440 | /* A thread with kernel thread ID -1 is either a thread that | |
1441 | exited and was joined, or a thread that is being created but | |
1442 | hasn't started yet, and that is reusing the tcb/stack of a | |
1443 | thread that previously exited and was joined. (glibc marks | |
1444 | terminated and joined threads with kernel thread ID -1. See | |
1445 | glibc PR17707. */ | |
d6c146e9 PA |
1446 | if (libthread_db_debug) |
1447 | fprintf_unfiltered (gdb_stdlog, | |
1448 | "thread_db: skipping exited and " | |
d41401ac DE |
1449 | "joined thread (0x%lx)\n", |
1450 | (unsigned long) ti.ti_tid); | |
a33e3959 PA |
1451 | return 0; |
1452 | } | |
1453 | ||
254f582e | 1454 | if (ti.ti_tid == 0) |
4105de34 DJ |
1455 | { |
1456 | /* A thread ID of zero means that this is the main thread, but | |
1457 | glibc has not yet initialized thread-local storage and the | |
1458 | pthread library. We do not know what the thread's TID will | |
c2c2a31f | 1459 | be yet. */ |
4105de34 | 1460 | |
4d062f1a PA |
1461 | /* In that case, we're not stopped in a fork syscall and don't |
1462 | need this glibc bug workaround. */ | |
1463 | info->need_stale_parent_threads_check = 0; | |
1464 | ||
4105de34 DJ |
1465 | return 0; |
1466 | } | |
1467 | ||
4d062f1a PA |
1468 | /* Ignore stale parent threads, caused by glibc/BZ5983. This is a |
1469 | bit expensive, as it needs to open /proc/pid/status, so try to | |
1470 | avoid doing the work if we know we don't have to. */ | |
1471 | if (info->need_stale_parent_threads_check) | |
1472 | { | |
1473 | int tgid = linux_proc_get_tgid (ti.ti_lid); | |
e0881a8e | 1474 | |
4d062f1a PA |
1475 | if (tgid != -1 && tgid != info->pid) |
1476 | return 0; | |
1477 | } | |
1478 | ||
1479 | ptid = ptid_build (info->pid, ti.ti_lid, 0); | |
e09875d4 | 1480 | tp = find_thread_ptid (ptid); |
fe978cb0 | 1481 | if (tp == NULL || tp->priv == NULL) |
60269a4a | 1482 | record_thread (info, tp, ptid, th_p, &ti); |
fb0e1ba7 MK |
1483 | |
1484 | return 0; | |
1485 | } | |
1486 | ||
02c6c942 PP |
1487 | /* Helper for thread_db_find_new_threads_2. |
1488 | Returns number of new threads found. */ | |
1489 | ||
1490 | static int | |
1491 | find_new_threads_once (struct thread_db_info *info, int iteration, | |
fb169834 | 1492 | td_err_e *errp) |
02c6c942 | 1493 | { |
02c6c942 | 1494 | struct callback_data data; |
fb169834 | 1495 | td_err_e err = TD_ERR; |
02c6c942 PP |
1496 | |
1497 | data.info = info; | |
1498 | data.new_threads = 0; | |
1499 | ||
2db9a427 | 1500 | /* See comment in thread_db_update_thread_list. */ |
1eb2dbb8 | 1501 | gdb_assert (info->td_ta_thr_iter_p != NULL); |
2db9a427 | 1502 | |
492d29ea | 1503 | TRY |
02c6c942 PP |
1504 | { |
1505 | /* Iterate over all user-space threads to discover new threads. */ | |
1506 | err = info->td_ta_thr_iter_p (info->thread_agent, | |
1507 | find_new_threads_callback, | |
1508 | &data, | |
1509 | TD_THR_ANY_STATE, | |
1510 | TD_THR_LOWEST_PRIORITY, | |
1511 | TD_SIGNO_MASK, | |
1512 | TD_THR_ANY_USER_FLAGS); | |
1513 | } | |
6c63c96a | 1514 | CATCH (except, RETURN_MASK_ERROR) |
02c6c942 | 1515 | { |
6c63c96a | 1516 | if (libthread_db_debug) |
492d29ea PA |
1517 | { |
1518 | exception_fprintf (gdb_stdlog, except, | |
1519 | "Warning: find_new_threads_once: "); | |
1520 | } | |
6c63c96a PA |
1521 | } |
1522 | END_CATCH | |
02c6c942 | 1523 | |
6c63c96a PA |
1524 | if (libthread_db_debug) |
1525 | { | |
883ed13e PA |
1526 | fprintf_unfiltered (gdb_stdlog, |
1527 | _("Found %d new threads in iteration %d.\n"), | |
1528 | data.new_threads, iteration); | |
02c6c942 PP |
1529 | } |
1530 | ||
1531 | if (errp != NULL) | |
1532 | *errp = err; | |
1533 | ||
1534 | return data.new_threads; | |
1535 | } | |
1536 | ||
4c28f408 | 1537 | /* Search for new threads, accessing memory through stopped thread |
02c6c942 PP |
1538 | PTID. If UNTIL_NO_NEW is true, repeat searching until several |
1539 | searches in a row do not discover any new threads. */ | |
4c28f408 | 1540 | |
fb0e1ba7 | 1541 | static void |
02c6c942 | 1542 | thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new) |
fb0e1ba7 | 1543 | { |
fcb44371 | 1544 | td_err_e err = TD_OK; |
d90e17a7 | 1545 | struct thread_db_info *info; |
02c6c942 | 1546 | int i, loop; |
4c28f408 | 1547 | |
dfd4cc63 | 1548 | info = get_thread_db_info (ptid_get_pid (ptid)); |
d90e17a7 | 1549 | |
4c28f408 | 1550 | /* Access an lwp we know is stopped. */ |
d90e17a7 | 1551 | info->proc_handle.ptid = ptid; |
02c6c942 PP |
1552 | |
1553 | if (until_no_new) | |
1554 | { | |
1555 | /* Require 4 successive iterations which do not find any new threads. | |
1556 | The 4 is a heuristic: there is an inherent race here, and I have | |
1557 | seen that 2 iterations in a row are not always sufficient to | |
1558 | "capture" all threads. */ | |
fcb44371 JK |
1559 | for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop) |
1560 | if (find_new_threads_once (info, i, &err) != 0) | |
1561 | { | |
1562 | /* Found some new threads. Restart the loop from beginning. */ | |
1563 | loop = -1; | |
1564 | } | |
02c6c942 PP |
1565 | } |
1566 | else | |
fcb44371 JK |
1567 | find_new_threads_once (info, 0, &err); |
1568 | ||
1569 | if (err != TD_OK) | |
1570 | error (_("Cannot find new threads: %s"), thread_db_err_str (err)); | |
fb0e1ba7 MK |
1571 | } |
1572 | ||
02c6c942 PP |
1573 | static void |
1574 | thread_db_find_new_threads_1 (ptid_t ptid) | |
1575 | { | |
1576 | thread_db_find_new_threads_2 (ptid, 0); | |
1577 | } | |
1578 | ||
a6904d5a PA |
1579 | /* Implement the to_update_thread_list target method for this |
1580 | target. */ | |
2db9a427 | 1581 | |
f6ac5f3d PA |
1582 | void |
1583 | thread_db_target::update_thread_list () | |
28439f5e | 1584 | { |
d90e17a7 | 1585 | struct thread_db_info *info; |
c65b3e0d | 1586 | struct inferior *inf; |
d90e17a7 | 1587 | |
e8032dde PA |
1588 | prune_threads (); |
1589 | ||
c65b3e0d PA |
1590 | ALL_INFERIORS (inf) |
1591 | { | |
1592 | struct thread_info *thread; | |
d90e17a7 | 1593 | |
c65b3e0d PA |
1594 | if (inf->pid == 0) |
1595 | continue; | |
d90e17a7 | 1596 | |
c65b3e0d PA |
1597 | info = get_thread_db_info (inf->pid); |
1598 | if (info == NULL) | |
1599 | continue; | |
1600 | ||
1601 | thread = any_live_thread_of_process (inf->pid); | |
1602 | if (thread == NULL || thread->executing) | |
1603 | continue; | |
1604 | ||
a6904d5a PA |
1605 | /* It's best to avoid td_ta_thr_iter if possible. That walks |
1606 | data structures in the inferior's address space that may be | |
1607 | corrupted, or, if the target is running, the list may change | |
1608 | while we walk it. In the latter case, it's possible that a | |
1609 | thread exits just at the exact time that causes GDB to get | |
1610 | stuck in an infinite loop. To avoid pausing all threads | |
1611 | whenever the core wants to refresh the thread list, we | |
1612 | instead use thread_from_lwp immediately when we see an LWP | |
1613 | stop. That uses thread_db entry points that do not walk | |
1614 | libpthread's thread list, so should be safe, as well as more | |
1615 | efficient. */ | |
1616 | if (target_has_execution_1 (thread->ptid)) | |
1617 | continue; | |
1618 | ||
c65b3e0d PA |
1619 | thread_db_find_new_threads_1 (thread->ptid); |
1620 | } | |
2db9a427 | 1621 | |
a6904d5a | 1622 | /* Give the beneath target a chance to do extra processing. */ |
b6a8c27b | 1623 | this->beneath ()->update_thread_list (); |
28439f5e PA |
1624 | } |
1625 | ||
f6ac5f3d PA |
1626 | const char * |
1627 | thread_db_target::pid_to_str (ptid_t ptid) | |
fb0e1ba7 | 1628 | { |
e09875d4 | 1629 | struct thread_info *thread_info = find_thread_ptid (ptid); |
17faa917 | 1630 | |
fe978cb0 | 1631 | if (thread_info != NULL && thread_info->priv != NULL) |
fb0e1ba7 MK |
1632 | { |
1633 | static char buf[64]; | |
7aabaf9d | 1634 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); |
fb0e1ba7 | 1635 | |
17faa917 | 1636 | snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)", |
7aabaf9d | 1637 | (unsigned long) priv->tid, ptid_get_lwp (ptid)); |
fb0e1ba7 MK |
1638 | |
1639 | return buf; | |
1640 | } | |
1641 | ||
d6ca69cd | 1642 | return beneath ()->pid_to_str (ptid); |
fb0e1ba7 MK |
1643 | } |
1644 | ||
28b17333 DJ |
1645 | /* Return a string describing the state of the thread specified by |
1646 | INFO. */ | |
1647 | ||
f6ac5f3d PA |
1648 | const char * |
1649 | thread_db_target::extra_thread_info (thread_info *info) | |
28b17333 | 1650 | { |
fe978cb0 | 1651 | if (info->priv == NULL) |
17faa917 DJ |
1652 | return NULL; |
1653 | ||
7aabaf9d SM |
1654 | thread_db_thread_info *priv = get_thread_db_thread_info (info); |
1655 | ||
1656 | if (priv->dying) | |
28b17333 DJ |
1657 | return "Exiting"; |
1658 | ||
1659 | return NULL; | |
1660 | } | |
1661 | ||
e04ee09e KB |
1662 | /* Return pointer to the thread_info struct which corresponds to |
1663 | THREAD_HANDLE (having length HANDLE_LEN). */ | |
1664 | ||
f6ac5f3d PA |
1665 | thread_info * |
1666 | thread_db_target::thread_handle_to_thread_info (const gdb_byte *thread_handle, | |
1667 | int handle_len, | |
1668 | inferior *inf) | |
e04ee09e KB |
1669 | { |
1670 | struct thread_info *tp; | |
1671 | thread_t handle_tid; | |
1672 | ||
1673 | /* Thread handle sizes must match in order to proceed. We don't use an | |
1674 | assert here because the resulting internal error will cause GDB to | |
1675 | exit. This isn't necessarily an internal error due to the possibility | |
1676 | of garbage being passed as the thread handle via the python interface. */ | |
1677 | if (handle_len != sizeof (handle_tid)) | |
1678 | error (_("Thread handle size mismatch: %d vs %zu (from libthread_db)"), | |
1679 | handle_len, sizeof (handle_tid)); | |
1680 | ||
1681 | handle_tid = * (const thread_t *) thread_handle; | |
1682 | ||
1683 | ALL_NON_EXITED_THREADS (tp) | |
1684 | { | |
7aabaf9d SM |
1685 | thread_db_thread_info *priv = get_thread_db_thread_info (tp); |
1686 | ||
1687 | if (tp->inf == inf && priv != NULL && handle_tid == priv->tid) | |
e04ee09e KB |
1688 | return tp; |
1689 | } | |
1690 | ||
1691 | return NULL; | |
1692 | } | |
1693 | ||
b2756930 KB |
1694 | /* Get the address of the thread local variable in load module LM which |
1695 | is stored at OFFSET within the thread local storage for thread PTID. */ | |
3f47be5c | 1696 | |
f6ac5f3d PA |
1697 | CORE_ADDR |
1698 | thread_db_target::get_thread_local_address (ptid_t ptid, | |
1699 | CORE_ADDR lm, | |
1700 | CORE_ADDR offset) | |
3f47be5c | 1701 | { |
17faa917 DJ |
1702 | struct thread_info *thread_info; |
1703 | ||
17faa917 | 1704 | /* Find the matching thread. */ |
e09875d4 | 1705 | thread_info = find_thread_ptid (ptid); |
4105de34 | 1706 | |
e0fd7c47 UW |
1707 | /* We may not have discovered the thread yet. */ |
1708 | if (thread_info != NULL && thread_info->priv == NULL) | |
be550b6e | 1709 | thread_info = thread_from_lwp (ptid); |
e0fd7c47 | 1710 | |
fe978cb0 | 1711 | if (thread_info != NULL && thread_info->priv != NULL) |
3f47be5c | 1712 | { |
3f47be5c | 1713 | td_err_e err; |
00f515da | 1714 | psaddr_t address; |
7aabaf9d SM |
1715 | thread_db_info *info = get_thread_db_info (ptid_get_pid (ptid)); |
1716 | thread_db_thread_info *priv = get_thread_db_thread_info (thread_info); | |
3f47be5c | 1717 | |
3f47be5c | 1718 | /* Finally, get the address of the variable. */ |
5876f503 JK |
1719 | if (lm != 0) |
1720 | { | |
1721 | /* glibc doesn't provide the needed interface. */ | |
1722 | if (!info->td_thr_tls_get_addr_p) | |
1723 | throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, | |
1724 | _("No TLS library support")); | |
1725 | ||
1726 | /* Note the cast through uintptr_t: this interface only works if | |
1727 | a target address fits in a psaddr_t, which is a host pointer. | |
1728 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
7aabaf9d | 1729 | err = info->td_thr_tls_get_addr_p (&priv->th, |
5876f503 JK |
1730 | (psaddr_t)(uintptr_t) lm, |
1731 | offset, &address); | |
1732 | } | |
1733 | else | |
1734 | { | |
1735 | /* If glibc doesn't provide the needed interface throw an error | |
1736 | that LM is zero - normally cases it should not be. */ | |
1737 | if (!info->td_thr_tlsbase_p) | |
1738 | throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR, | |
1739 | _("TLS load module not found")); | |
1740 | ||
1741 | /* This code path handles the case of -static -pthread executables: | |
1742 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
1743 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
1744 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
1745 | The constant number 1 depends on GNU __libc_setup_tls | |
1746 | initialization of l_tls_modid to 1. */ | |
7aabaf9d | 1747 | err = info->td_thr_tlsbase_p (&priv->th, 1, &address); |
5876f503 JK |
1748 | address = (char *) address + offset; |
1749 | } | |
3f47be5c EZ |
1750 | |
1751 | #ifdef THREAD_DB_HAS_TD_NOTALLOC | |
1752 | /* The memory hasn't been allocated, yet. */ | |
1753 | if (err == TD_NOTALLOC) | |
b4acd559 JJ |
1754 | /* Now, if libthread_db provided the initialization image's |
1755 | address, we *could* try to build a non-lvalue value from | |
1756 | the initialization image. */ | |
109c3e39 AC |
1757 | throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
1758 | _("TLS not allocated yet")); | |
3f47be5c EZ |
1759 | #endif |
1760 | ||
1761 | /* Something else went wrong. */ | |
1762 | if (err != TD_OK) | |
109c3e39 AC |
1763 | throw_error (TLS_GENERIC_ERROR, |
1764 | (("%s")), thread_db_err_str (err)); | |
3f47be5c EZ |
1765 | |
1766 | /* Cast assuming host == target. Joy. */ | |
16451949 AS |
1767 | /* Do proper sign extension for the target. */ |
1768 | gdb_assert (exec_bfd); | |
1769 | return (bfd_get_sign_extend_vma (exec_bfd) > 0 | |
1770 | ? (CORE_ADDR) (intptr_t) address | |
1771 | : (CORE_ADDR) (uintptr_t) address); | |
3f47be5c EZ |
1772 | } |
1773 | ||
d6ca69cd | 1774 | return beneath ()->get_thread_local_address (ptid, lm, offset); |
3f47be5c EZ |
1775 | } |
1776 | ||
0ef643c8 JB |
1777 | /* Implement the to_get_ada_task_ptid target method for this target. */ |
1778 | ||
f6ac5f3d PA |
1779 | ptid_t |
1780 | thread_db_target::get_ada_task_ptid (long lwp, long thread) | |
0ef643c8 | 1781 | { |
2db9a427 PA |
1782 | /* NPTL uses a 1:1 model, so the LWP id suffices. */ |
1783 | return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); | |
0ef643c8 JB |
1784 | } |
1785 | ||
f6ac5f3d PA |
1786 | void |
1787 | thread_db_target::resume (ptid_t ptid, int step, enum gdb_signal signo) | |
4d062f1a | 1788 | { |
4d062f1a PA |
1789 | struct thread_db_info *info; |
1790 | ||
1791 | if (ptid_equal (ptid, minus_one_ptid)) | |
dfd4cc63 | 1792 | info = get_thread_db_info (ptid_get_pid (inferior_ptid)); |
4d062f1a | 1793 | else |
dfd4cc63 | 1794 | info = get_thread_db_info (ptid_get_pid (ptid)); |
4d062f1a PA |
1795 | |
1796 | /* This workaround is only needed for child fork lwps stopped in a | |
1797 | PTRACE_O_TRACEFORK event. When the inferior is resumed, the | |
1798 | workaround can be disabled. */ | |
1799 | if (info) | |
1800 | info->need_stale_parent_threads_check = 0; | |
1801 | ||
d6ca69cd | 1802 | beneath ()->resume (ptid, step, signo); |
4d062f1a PA |
1803 | } |
1804 | ||
9b292f68 | 1805 | /* std::sort helper function for info_auto_load_libthread_db, sort the |
bf88dd68 JK |
1806 | thread_db_info pointers primarily by their FILENAME and secondarily by their |
1807 | PID, both in ascending order. */ | |
1808 | ||
9b292f68 TT |
1809 | static bool |
1810 | info_auto_load_libthread_db_compare (const struct thread_db_info *a, | |
1811 | const struct thread_db_info *b) | |
bf88dd68 | 1812 | { |
bf88dd68 JK |
1813 | int retval; |
1814 | ||
1815 | retval = strcmp (a->filename, b->filename); | |
1816 | if (retval) | |
9b292f68 | 1817 | return retval < 0; |
bf88dd68 | 1818 | |
9b292f68 | 1819 | return a->pid < b->pid; |
bf88dd68 JK |
1820 | } |
1821 | ||
1822 | /* Implement 'info auto-load libthread-db'. */ | |
1823 | ||
1824 | static void | |
5fed81ff | 1825 | info_auto_load_libthread_db (const char *args, int from_tty) |
bf88dd68 JK |
1826 | { |
1827 | struct ui_out *uiout = current_uiout; | |
1828 | const char *cs = args ? args : ""; | |
9b292f68 TT |
1829 | struct thread_db_info *info; |
1830 | unsigned unique_filenames; | |
1831 | size_t max_filename_len, pids_len; | |
bf88dd68 JK |
1832 | int i; |
1833 | ||
f1735a53 | 1834 | cs = skip_spaces (cs); |
bf88dd68 JK |
1835 | if (*cs) |
1836 | error (_("'info auto-load libthread-db' does not accept any parameters")); | |
1837 | ||
9b292f68 | 1838 | std::vector<struct thread_db_info *> array; |
bf88dd68 JK |
1839 | for (info = thread_db_list; info; info = info->next) |
1840 | if (info->filename != NULL) | |
9b292f68 | 1841 | array.push_back (info); |
bf88dd68 JK |
1842 | |
1843 | /* Sort ARRAY by filenames and PIDs. */ | |
9b292f68 TT |
1844 | std::sort (array.begin (), array.end (), |
1845 | info_auto_load_libthread_db_compare); | |
bf88dd68 JK |
1846 | |
1847 | /* Calculate the number of unique filenames (rows) and the maximum string | |
1848 | length of PIDs list for the unique filenames (columns). */ | |
1849 | ||
1850 | unique_filenames = 0; | |
1851 | max_filename_len = 0; | |
bf88dd68 | 1852 | pids_len = 0; |
9b292f68 | 1853 | for (i = 0; i < array.size (); i++) |
bf88dd68 JK |
1854 | { |
1855 | int pid = array[i]->pid; | |
1856 | size_t this_pid_len; | |
1857 | ||
1858 | for (this_pid_len = 0; pid != 0; pid /= 10) | |
1859 | this_pid_len++; | |
1860 | ||
1861 | if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0) | |
1862 | { | |
1863 | unique_filenames++; | |
325fac50 PA |
1864 | max_filename_len = std::max (max_filename_len, |
1865 | strlen (array[i]->filename)); | |
bf88dd68 JK |
1866 | |
1867 | if (i > 0) | |
9b292f68 | 1868 | pids_len -= strlen (", "); |
bf88dd68 JK |
1869 | pids_len = 0; |
1870 | } | |
1871 | pids_len += this_pid_len + strlen (", "); | |
1872 | } | |
1873 | if (i) | |
9b292f68 | 1874 | pids_len -= strlen (", "); |
bf88dd68 JK |
1875 | |
1876 | /* Table header shifted right by preceding "libthread-db: " would not match | |
1877 | its columns. */ | |
9b292f68 | 1878 | if (array.size () > 0 && args == auto_load_info_scripts_pattern_nl) |
112e8700 | 1879 | uiout->text ("\n"); |
bf88dd68 | 1880 | |
4a2b031d TT |
1881 | { |
1882 | ui_out_emit_table table_emitter (uiout, 2, unique_filenames, | |
1883 | "LinuxThreadDbTable"); | |
bf88dd68 | 1884 | |
4a2b031d TT |
1885 | uiout->table_header (max_filename_len, ui_left, "filename", "Filename"); |
1886 | uiout->table_header (pids_len, ui_left, "PIDs", "Pids"); | |
1887 | uiout->table_body (); | |
bf88dd68 | 1888 | |
4a2b031d | 1889 | /* Note I is incremented inside the cycle, not at its end. */ |
9b292f68 | 1890 | for (i = 0; i < array.size ();) |
4a2b031d TT |
1891 | { |
1892 | ui_out_emit_tuple tuple_emitter (uiout, NULL); | |
bf88dd68 | 1893 | |
4a2b031d TT |
1894 | info = array[i]; |
1895 | uiout->field_string ("filename", info->filename); | |
bf88dd68 | 1896 | |
9b292f68 TT |
1897 | std::string pids; |
1898 | while (i < array.size () && strcmp (info->filename, | |
1899 | array[i]->filename) == 0) | |
4a2b031d | 1900 | { |
9b292f68 TT |
1901 | if (!pids.empty ()) |
1902 | pids += ", "; | |
1903 | string_appendf (pids, "%u", array[i]->pid); | |
4a2b031d TT |
1904 | i++; |
1905 | } | |
bf88dd68 | 1906 | |
9b292f68 | 1907 | uiout->field_string ("pids", pids.c_str ()); |
bf88dd68 | 1908 | |
4a2b031d TT |
1909 | uiout->text ("\n"); |
1910 | } | |
1911 | } | |
bf88dd68 | 1912 | |
9b292f68 | 1913 | if (array.empty ()) |
112e8700 | 1914 | uiout->message (_("No auto-loaded libthread-db.\n")); |
bf88dd68 JK |
1915 | } |
1916 | ||
5045b3d7 GB |
1917 | /* Implement 'maintenance check libthread-db'. */ |
1918 | ||
1919 | static void | |
1920 | maintenance_check_libthread_db (const char *args, int from_tty) | |
1921 | { | |
1922 | int inferior_pid = ptid_get_pid (inferior_ptid); | |
1923 | struct thread_db_info *info; | |
1924 | ||
1925 | if (inferior_pid == 0) | |
1926 | error (_("No inferior running")); | |
1927 | ||
1928 | info = get_thread_db_info (inferior_pid); | |
1929 | if (info == NULL) | |
1930 | error (_("No libthread_db loaded")); | |
1931 | ||
1932 | check_thread_db (info, true); | |
1933 | } | |
1934 | ||
fb0e1ba7 MK |
1935 | void |
1936 | _initialize_thread_db (void) | |
1937 | { | |
17a37d48 PP |
1938 | /* Defer loading of libthread_db.so until inferior is running. |
1939 | This allows gdb to load correct libthread_db for a given | |
4a6ed09b PA |
1940 | executable -- there could be multiple versions of glibc, |
1941 | and until there is a running inferior, we can't tell which | |
1942 | libthread_db is the correct one to load. */ | |
17a37d48 PP |
1943 | |
1944 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
1945 | ||
1946 | add_setshow_optional_filename_cmd ("libthread-db-search-path", | |
1947 | class_support, | |
1948 | &libthread_db_search_path, _("\ | |
1949 | Set search path for libthread_db."), _("\ | |
1950 | Show the current search path or libthread_db."), _("\ | |
1951 | This path is used to search for libthread_db to be loaded into \ | |
84e578fb DE |
1952 | gdb itself.\n\ |
1953 | Its value is a colon (':') separate list of directories to search.\n\ | |
1954 | Setting the search path to an empty list resets it to its default value."), | |
1955 | set_libthread_db_search_path, | |
17a37d48 PP |
1956 | NULL, |
1957 | &setlist, &showlist); | |
02d868e8 | 1958 | |
ccce17b0 YQ |
1959 | add_setshow_zuinteger_cmd ("libthread-db", class_maintenance, |
1960 | &libthread_db_debug, _("\ | |
02d868e8 PP |
1961 | Set libthread-db debugging."), _("\ |
1962 | Show libthread-db debugging."), _("\ | |
1963 | When non-zero, libthread-db debugging is enabled."), | |
ccce17b0 YQ |
1964 | NULL, |
1965 | show_libthread_db_debug, | |
1966 | &setdebuglist, &showdebuglist); | |
02d868e8 | 1967 | |
bf88dd68 JK |
1968 | add_setshow_boolean_cmd ("libthread-db", class_support, |
1969 | &auto_load_thread_db, _("\ | |
1970 | Enable or disable auto-loading of inferior specific libthread_db."), _("\ | |
1971 | Show whether auto-loading inferior specific libthread_db is enabled."), _("\ | |
1972 | If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\ | |
1973 | locations to load libthread_db compatible with the inferior.\n\ | |
1974 | Standard system libthread_db still gets loaded even with this option off.\n\ | |
1975 | This options has security implications for untrusted inferiors."), | |
1976 | NULL, show_auto_load_thread_db, | |
1977 | auto_load_set_cmdlist_get (), | |
1978 | auto_load_show_cmdlist_get ()); | |
1979 | ||
1980 | add_cmd ("libthread-db", class_info, info_auto_load_libthread_db, | |
1981 | _("Print the list of loaded inferior specific libthread_db.\n\ | |
1982 | Usage: info auto-load libthread-db"), | |
1983 | auto_load_info_cmdlist_get ()); | |
1984 | ||
5045b3d7 GB |
1985 | add_cmd ("libthread-db", class_maintenance, |
1986 | maintenance_check_libthread_db, _("\ | |
1987 | Run integrity checks on the current inferior's libthread_db."), | |
1988 | &maintenancechecklist); | |
1989 | ||
1990 | add_setshow_boolean_cmd ("check-libthread-db", | |
1991 | class_maintenance, | |
1992 | &check_thread_db_on_load, _("\ | |
1993 | Set whether to check libthread_db at load time."), _("\ | |
1994 | Show whether to check libthread_db at load time."), _("\ | |
1995 | If enabled GDB will run integrity checks on inferior specific libthread_db\n\ | |
1996 | as they are loaded."), | |
1997 | NULL, | |
1998 | NULL, | |
1999 | &maintenance_set_cmdlist, | |
2000 | &maintenance_show_cmdlist); | |
2001 | ||
17a37d48 | 2002 | /* Add ourselves to objfile event chain. */ |
76727919 | 2003 | gdb::observers::new_objfile.attach (thread_db_new_objfile); |
0838fb57 DE |
2004 | |
2005 | /* Add ourselves to inferior_created event chain. | |
2006 | This is needed to handle debugging statically linked programs where | |
2007 | the new_objfile observer won't get called for libpthread. */ | |
76727919 | 2008 | gdb::observers::inferior_created.attach (thread_db_inferior_created); |
fb0e1ba7 | 2009 | } |