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/tmp/gdb-7.10/gdb/linux-thread-db.c
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1 /* libthread_db assisted debugging support, generic parts.
2 
3  Copyright (C) 1999-2015 Free Software Foundation, Inc.
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
9  the Free Software Foundation; either version 3 of the License, or
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
18  along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 
20 #include "defs.h"
21 #include <dlfcn.h>
22 #include "gdb_proc_service.h"
23 #include "nat/gdb_thread_db.h"
24 #include "gdb_vecs.h"
25 #include "bfd.h"
26 #include "command.h"
27 #include "gdbcmd.h"
28 #include "gdbthread.h"
29 #include "inferior.h"
30 #include "infrun.h"
31 #include "symfile.h"
32 #include "objfiles.h"
33 #include "target.h"
34 #include "regcache.h"
35 #include "solib.h"
36 #include "solib-svr4.h"
37 #include "gdbcore.h"
38 #include "observer.h"
39 #include "linux-nat.h"
40 #include "nat/linux-procfs.h"
41 #include "nat/linux-ptrace.h"
42 #include "nat/linux-osdata.h"
43 #include "auto-load.h"
44 #include "cli/cli-utils.h"
45 #include <signal.h>
46 #include <ctype.h>
47 #include "nat/linux-namespaces.h"
48 
49 /* GNU/Linux libthread_db support.
50 
51  libthread_db is a library, provided along with libpthread.so, which
52  exposes the internals of the thread library to a debugger. It
53  allows GDB to find existing threads, new threads as they are
54  created, thread IDs (usually, the result of pthread_self), and
55  thread-local variables.
56 
57  The libthread_db interface originates on Solaris, where it is
58  both more powerful and more complicated. This implementation
59  only works for LinuxThreads and NPTL, the two glibc threading
60  libraries. It assumes that each thread is permanently assigned
61  to a single light-weight process (LWP).
62 
63  libthread_db-specific information is stored in the "private" field
64  of struct thread_info. When the field is NULL we do not yet have
65  information about the new thread; this could be temporary (created,
66  but the thread library's data structures do not reflect it yet)
67  or permanent (created using clone instead of pthread_create).
68 
69  Process IDs managed by linux-thread-db.c match those used by
70  linux-nat.c: a common PID for all processes, an LWP ID for each
71  thread, and no TID. We save the TID in private. Keeping it out
72  of the ptid_t prevents thread IDs changing when libpthread is
73  loaded or unloaded. */
74 
76 
77 /* Set to non-zero if thread_db auto-loading is enabled
78  by the "set auto-load libthread-db" command. */
79 static int auto_load_thread_db = 1;
80 
81 /* Returns true if we need to use thread_db thread create/death event
82  breakpoints to learn about threads. */
83 
84 static int
86 {
87  /* Not necessary if the kernel supports clone events. */
88  return !linux_supports_traceclone ();
89 }
90 
91 /* "show" command for the auto_load_thread_db configuration variable. */
92 
93 static void
94 show_auto_load_thread_db (struct ui_file *file, int from_tty,
95  struct cmd_list_element *c, const char *value)
96 {
97  fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db "
98  "is %s.\n"),
99  value);
100 }
101 
102 static void
103 set_libthread_db_search_path (char *ignored, int from_tty,
104  struct cmd_list_element *c)
105 {
106  if (*libthread_db_search_path == '\0')
107  {
110  }
111 }
112 
113 /* If non-zero, print details of libthread_db processing. */
114 
115 static unsigned int libthread_db_debug;
116 
117 static void
118 show_libthread_db_debug (struct ui_file *file, int from_tty,
119  struct cmd_list_element *c, const char *value)
120 {
121  fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value);
122 }
123 
124 /* If we're running on GNU/Linux, we must explicitly attach to any new
125  threads. */
126 
127 /* This module's target vector. */
128 static struct target_ops thread_db_ops;
129 
130 /* Non-zero if we have determined the signals used by the threads
131  library. */
132 static int thread_signals;
133 static sigset_t thread_stop_set;
134 static sigset_t thread_print_set;
135 
137 {
139 
140  /* Process id this object refers to. */
141  int pid;
142 
143  /* Handle from dlopen for libthread_db.so. */
144  void *handle;
145 
146  /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing
147  HANDLE. It may be NULL for system library. */
148  char *filename;
149 
150  /* Structure that identifies the child process for the
151  <proc_service.h> interface. */
153 
154  /* Connection to the libthread_db library. */
156 
157  /* True if we need to apply the workaround for glibc/BZ5983. When
158  we catch a PTRACE_O_TRACEFORK, and go query the child's thread
159  list, nptl_db returns the parent's threads in addition to the new
160  (single) child thread. If this flag is set, we do extra work to
161  be able to ignore such stale entries. */
163 
164  /* Location of the thread creation event breakpoint. The code at
165  this location in the child process will be called by the pthread
166  library whenever a new thread is created. By setting a special
167  breakpoint at this location, GDB can detect when a new thread is
168  created. We obtain this location via the td_ta_event_addr
169  call. */
171 
172  /* Location of the thread death event breakpoint. */
174 
175  /* Pointers to the libthread_db functions. */
176 
177  td_err_e (*td_init_p) (void);
178 
180  td_thragent_t **ta);
182  lwpid_t lwpid, td_thrhandle_t *th);
184  td_thr_iter_f *callback, void *cbdata_p,
185  td_thr_state_e state, int ti_pri,
186  sigset_t *ti_sigmask_p,
187  unsigned int ti_user_flags);
189  td_event_e event, td_notify_t *ptr);
191  td_thr_events_t *event);
193  td_thr_events_t *event);
195  td_event_msg_t *msg);
196 
198  td_thrinfo_t *infop);
200  int event);
201 
203  psaddr_t map_address,
204  size_t offset, psaddr_t *address);
206  unsigned long int modid,
207  psaddr_t *base);
208 };
209 
210 /* List of known processes using thread_db, and the required
211  bookkeeping. */
213 
215 static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new);
216 
217 static void check_thread_signals (void);
218 
219 static void record_thread (struct thread_db_info *info,
220  struct thread_info *tp,
221  ptid_t ptid, const td_thrhandle_t *th_p,
222  const td_thrinfo_t *ti_p);
223 
224 /* Add the current inferior to the list of processes using libpthread.
225  Return a pointer to the newly allocated object that was added to
226  THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing
227  LIBTHREAD_DB_SO. */
228 
229 static struct thread_db_info *
231 {
232  struct thread_db_info *info;
233 
234  info = xcalloc (1, sizeof (*info));
235  info->pid = ptid_get_pid (inferior_ptid);
236  info->handle = handle;
237 
238  /* The workaround works by reading from /proc/pid/status, so it is
239  disabled for core files. */
242 
243  info->next = thread_db_list;
244  thread_db_list = info;
245 
246  return info;
247 }
248 
249 /* Return the thread_db_info object representing the bookkeeping
250  related to process PID, if any; NULL otherwise. */
251 
252 static struct thread_db_info *
254 {
255  struct thread_db_info *info;
256 
257  for (info = thread_db_list; info; info = info->next)
258  if (pid == info->pid)
259  return info;
260 
261  return NULL;
262 }
263 
264 /* When PID has exited or has been detached, we no longer want to keep
265  track of it as using libpthread. Call this function to discard
266  thread_db related info related to PID. Note that this closes
267  LIBTHREAD_DB_SO's dlopen'ed handle. */
268 
269 static void
271 {
272  struct thread_db_info *info, *info_prev;
273 
274  info_prev = NULL;
275 
276  for (info = thread_db_list; info; info_prev = info, info = info->next)
277  if (pid == info->pid)
278  break;
279 
280  if (info == NULL)
281  return;
282 
283  if (info->handle != NULL)
284  dlclose (info->handle);
285 
286  xfree (info->filename);
287 
288  if (info_prev)
289  info_prev->next = info->next;
290  else
291  thread_db_list = info->next;
292 
293  xfree (info);
294 }
295 
296 /* Prototypes for local functions. */
297 static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
298  const td_thrinfo_t *ti_p);
299 static void detach_thread (ptid_t ptid);
300 
301 
302 /* Use "struct private_thread_info" to cache thread state. This is
303  a substantial optimization. */
304 
305 struct private_thread_info
306 {
307  /* Flag set when we see a TD_DEATH event for this thread. */
308  unsigned int dying:1;
309 
310  /* Cached thread state. */
313 };
314 
315 
316 static char *
318 {
319  static char buf[64];
320 
321  switch (err)
322  {
323  case TD_OK:
324  return "generic 'call succeeded'";
325  case TD_ERR:
326  return "generic error";
327  case TD_NOTHR:
328  return "no thread to satisfy query";
329  case TD_NOSV:
330  return "no sync handle to satisfy query";
331  case TD_NOLWP:
332  return "no LWP to satisfy query";
333  case TD_BADPH:
334  return "invalid process handle";
335  case TD_BADTH:
336  return "invalid thread handle";
337  case TD_BADSH:
338  return "invalid synchronization handle";
339  case TD_BADTA:
340  return "invalid thread agent";
341  case TD_BADKEY:
342  return "invalid key";
343  case TD_NOMSG:
344  return "no event message for getmsg";
345  case TD_NOFPREGS:
346  return "FPU register set not available";
347  case TD_NOLIBTHREAD:
348  return "application not linked with libthread";
349  case TD_NOEVENT:
350  return "requested event is not supported";
351  case TD_NOCAPAB:
352  return "capability not available";
353  case TD_DBERR:
354  return "debugger service failed";
355  case TD_NOAPLIC:
356  return "operation not applicable to";
357  case TD_NOTSD:
358  return "no thread-specific data for this thread";
359  case TD_MALLOC:
360  return "malloc failed";
361  case TD_PARTIALREG:
362  return "only part of register set was written/read";
363  case TD_NOXREGS:
364  return "X register set not available for this thread";
365 #ifdef THREAD_DB_HAS_TD_NOTALLOC
366  case TD_NOTALLOC:
367  return "thread has not yet allocated TLS for given module";
368 #endif
369 #ifdef THREAD_DB_HAS_TD_VERSION
370  case TD_VERSION:
371  return "versions of libpthread and libthread_db do not match";
372 #endif
373 #ifdef THREAD_DB_HAS_TD_NOTLS
374  case TD_NOTLS:
375  return "there is no TLS segment in the given module";
376 #endif
377  default:
378  snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err);
379  return buf;
380  }
381 }
382 
383 /* Return 1 if any threads have been registered. There may be none if
384  the threading library is not fully initialized yet. */
385 
386 static int
387 have_threads_callback (struct thread_info *thread, void *args)
388 {
389  int pid = * (int *) args;
390 
391  if (ptid_get_pid (thread->ptid) != pid)
392  return 0;
393 
394  return thread->priv != NULL;
395 }
396 
397 static int
399 {
400  int pid = ptid_get_pid (ptid);
401 
402  return iterate_over_threads (have_threads_callback, &pid) != NULL;
403 }
404 
405 
406 /* Fetch the user-level thread id of PTID. */
407 
408 static void
410 {
411  td_thrhandle_t th;
412  td_thrinfo_t ti;
413  td_err_e err;
414  struct thread_db_info *info;
415  struct thread_info *tp;
416 
417  /* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */
418  th.th_unique = 0;
419 
420  /* This ptid comes from linux-nat.c, which should always fill in the
421  LWP. */
422  gdb_assert (ptid_get_lwp (ptid) != 0);
423 
424  info = get_thread_db_info (ptid_get_pid (ptid));
425 
426  /* Access an lwp we know is stopped. */
427  info->proc_handle.ptid = ptid;
428  err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid),
429  &th);
430  if (err != TD_OK)
431  error (_("Cannot find user-level thread for LWP %ld: %s"),
432  ptid_get_lwp (ptid), thread_db_err_str (err));
433 
434  err = info->td_thr_get_info_p (&th, &ti);
435  if (err != TD_OK)
436  error (_("thread_get_info_callback: cannot get thread info: %s"),
437  thread_db_err_str (err));
438 
439  /* Fill the cache. */
440  tp = find_thread_ptid (ptid);
441  record_thread (info, tp, ptid, &th, &ti);
442 }
443 
444 
445 /* See linux-nat.h. */
446 
447 int
449 {
450  td_thrhandle_t th;
451  td_thrinfo_t ti;
452  td_err_e err;
453  struct thread_db_info *info;
454 
455  info = get_thread_db_info (ptid_get_pid (child));
456 
457  if (info == NULL)
458  return 0;
459 
460  thread_from_lwp (child);
461 
462  /* If we do not know about the main thread yet, this would be a good
463  time to find it. */
464  thread_from_lwp (parent);
465  return 1;
466 }
467 
468 static void *
469 verbose_dlsym (void *handle, const char *name)
470 {
471  void *sym = dlsym (handle, name);
472  if (sym == NULL)
473  warning (_("Symbol \"%s\" not found in libthread_db: %s"),
474  name, dlerror ());
475  return sym;
476 }
477 
478 static td_err_e
480 {
482  td_err_e err;
483  struct thread_db_info *info;
484 
486 
487  /* Access an lwp we know is stopped. */
489 
490  /* Get the breakpoint address for thread EVENT. */
491  err = info->td_ta_event_addr_p (info->thread_agent, event, &notify);
492  if (err != TD_OK)
493  return err;
494 
495  /* Set up the breakpoint. */
498  (target_gdbarch (),
499  /* Do proper sign extension for the target. */
500  (bfd_get_sign_extend_vma (exec_bfd) > 0
501  ? (CORE_ADDR) (intptr_t) notify.u.bptaddr
502  : (CORE_ADDR) (uintptr_t) notify.u.bptaddr),
503  &current_target));
505 
506  return TD_OK;
507 }
508 
509 /* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and
510  return 1 if this version is lower (and not equal) to
511  VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */
512 
513 static int
514 inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min)
515 {
516  struct bound_minimal_symbol version_msym;
517  CORE_ADDR version_addr;
518  char *version;
519  int err, got, retval = 0;
520 
521  version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL);
522  if (version_msym.minsym == NULL)
523  return 0;
524 
525  version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym);
526  got = target_read_string (version_addr, &version, 32, &err);
527  if (err == 0 && memchr (version, 0, got) == &version[got -1])
528  {
529  int major, minor;
530 
531  retval = (sscanf (version, "%d.%d", &major, &minor) == 2
532  && (major < ver_major_min
533  || (major == ver_major_min && minor < ver_minor_min)));
534  }
535  xfree (version);
536 
537  return retval;
538 }
539 
540 static void
542 {
543  td_thr_events_t events;
544  td_err_e err;
545  struct thread_db_info *info;
546 
548 
549  /* We cannot use the thread event reporting facility if these
550  functions aren't available. */
551  if (info->td_ta_event_addr_p == NULL
552  || info->td_ta_set_event_p == NULL
553  || info->td_ta_event_getmsg_p == NULL
554  || info->td_thr_event_enable_p == NULL)
555  return;
556 
557  /* Set the process wide mask saying which events we're interested in. */
558  td_event_emptyset (&events);
559  td_event_addset (&events, TD_CREATE);
560 
561  /* There is a bug fixed between linuxthreads 2.1.3 and 2.2 by
562  commit 2e4581e4fba917f1779cd0a010a45698586c190a
563  * manager.c (pthread_exited): Correctly report event as TD_REAP
564  instead of TD_DEATH. Fix comments.
565  where event reporting facility is broken for TD_DEATH events,
566  so don't enable it if we have glibc but a lower version. */
567  if (!inferior_has_bug ("__linuxthreads_version", 2, 2))
568  td_event_addset (&events, TD_DEATH);
569 
570  err = info->td_ta_set_event_p (info->thread_agent, &events);
571  if (err != TD_OK)
572  {
573  warning (_("Unable to set global thread event mask: %s"),
574  thread_db_err_str (err));
575  return;
576  }
577 
578  /* Delete previous thread event breakpoints, if any. */
580  info->td_create_bp_addr = 0;
581  info->td_death_bp_addr = 0;
582 
583  /* Set up the thread creation event. */
585  if (err != TD_OK)
586  {
587  warning (_("Unable to get location for thread creation breakpoint: %s"),
588  thread_db_err_str (err));
589  return;
590  }
591 
592  /* Set up the thread death event. */
594  if (err != TD_OK)
595  {
596  warning (_("Unable to get location for thread death breakpoint: %s"),
597  thread_db_err_str (err));
598  return;
599  }
600 }
601 
602 /* Similar as thread_db_find_new_threads_1, but try to silently ignore errors
603  if appropriate.
604 
605  Return 1 if the caller should abort libthread_db initialization. Return 0
606  otherwise. */
607 
608 static int
610 {
611 
612  TRY
613  {
615  }
616 
617  CATCH (except, RETURN_MASK_ERROR)
618  {
619  if (libthread_db_debug)
620  exception_fprintf (gdb_stdlog, except,
621  "Warning: thread_db_find_new_threads_silently: ");
622 
623  /* There is a bug fixed between nptl 2.6.1 and 2.7 by
624  commit 7d9d8bd18906fdd17364f372b160d7ab896ce909
625  where calls to td_thr_get_info fail with TD_ERR for statically linked
626  executables if td_thr_get_info is called before glibc has initialized
627  itself.
628 
629  If the nptl bug is NOT present in the inferior and still thread_db
630  reports an error return 1. It means the inferior has corrupted thread
631  list and GDB should fall back only to LWPs.
632 
633  If the nptl bug is present in the inferior return 0 to silently ignore
634  such errors, and let gdb enumerate threads again later. In such case
635  GDB cannot properly display LWPs if the inferior thread list is
636  corrupted. For core files it does not apply, no 'later enumeration'
637  is possible. */
638 
639  if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7))
640  {
641  exception_fprintf (gdb_stderr, except,
642  _("Warning: couldn't activate thread debugging "
643  "using libthread_db: "));
644  return 1;
645  }
646  }
647  END_CATCH
648 
649  return 0;
650 }
651 
652 /* Lookup a library in which given symbol resides.
653  Note: this is looking in GDB process, not in the inferior.
654  Returns library name, or NULL. */
655 
656 static const char *
657 dladdr_to_soname (const void *addr)
658 {
659  Dl_info info;
660 
661  if (dladdr (addr, &info) != 0)
662  return info.dli_fname;
663  return NULL;
664 }
665 
666 /* Attempt to initialize dlopen()ed libthread_db, described by INFO.
667  Return 1 on success.
668  Failure could happen if libthread_db does not have symbols we expect,
669  or when it refuses to work with the current inferior (e.g. due to
670  version mismatch between libthread_db and libpthread). */
671 
672 static int
674 {
675  td_err_e err;
676 
677  /* Initialize pointers to the dynamic library functions we will use.
678  Essential functions first. */
679 
680  info->td_init_p = verbose_dlsym (info->handle, "td_init");
681  if (info->td_init_p == NULL)
682  return 0;
683 
684  err = info->td_init_p ();
685  if (err != TD_OK)
686  {
687  warning (_("Cannot initialize libthread_db: %s"),
688  thread_db_err_str (err));
689  return 0;
690  }
691 
692  info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new");
693  if (info->td_ta_new_p == NULL)
694  return 0;
695 
696  /* Initialize the structure that identifies the child process. */
698 
699  /* Now attempt to open a connection to the thread library. */
700  err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent);
701  if (err != TD_OK)
702  {
703  if (libthread_db_debug)
704  fprintf_unfiltered (gdb_stdlog, _("td_ta_new failed: %s\n"),
705  thread_db_err_str (err));
706  else
707  switch (err)
708  {
709  case TD_NOLIBTHREAD:
710 #ifdef THREAD_DB_HAS_TD_VERSION
711  case TD_VERSION:
712 #endif
713  /* The errors above are not unexpected and silently ignored:
714  they just mean we haven't found correct version of
715  libthread_db yet. */
716  break;
717  default:
718  warning (_("td_ta_new failed: %s"), thread_db_err_str (err));
719  }
720  return 0;
721  }
722 
724  "td_ta_map_lwp2thr");
725  if (info->td_ta_map_lwp2thr_p == NULL)
726  return 0;
727 
728  info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter");
729  if (info->td_ta_thr_iter_p == NULL)
730  return 0;
731 
732  info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info");
733  if (info->td_thr_get_info_p == NULL)
734  return 0;
735 
736  /* These are not essential. */
737  info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr");
738  info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event");
739  info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event");
740  info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg");
741  info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable");
742  info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr");
743  info->td_thr_tlsbase_p = dlsym (info->handle, "td_thr_tlsbase");
744 
745  /* It's best to avoid td_ta_thr_iter if possible. That walks data
746  structures in the inferior's address space that may be corrupted,
747  or, if the target is running, may change while we walk them. If
748  there's execution (and /proc is mounted), then we're already
749  attached to all LWPs. Use thread_from_lwp, which uses
750  td_ta_map_lwp2thr instead, which does not walk the thread list.
751 
752  td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that
753  currently on core targets, as it uses ptrace directly. */
756  {
757  struct lwp_info *lp;
759 
761 
762  ALL_LWPS (lp)
763  if (ptid_get_pid (lp->ptid) == pid)
764  thread_from_lwp (lp->ptid);
765 
767  }
769  {
770  /* Even if libthread_db initializes, if the thread list is
771  corrupted, we'd not manage to list any threads. Better reject this
772  thread_db, and fall back to at least listing LWPs. */
773  return 0;
774  }
775 
776  printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n"));
777 
779  {
780  struct ui_file *file;
781  const char *library;
782 
783  library = dladdr_to_soname (*info->td_ta_new_p);
784  if (library == NULL)
785  library = LIBTHREAD_DB_SO;
786 
787  /* If we'd print this to gdb_stdout when debug output is
788  disabled, still print it to gdb_stdout if debug output is
789  enabled. User visible output should not depend on debug
790  settings. */
791  file = *libthread_db_search_path != '\0' ? gdb_stdout : gdb_stdlog;
792  fprintf_unfiltered (file, _("Using host libthread_db library \"%s\".\n"),
793  library);
794  }
795 
796  /* The thread library was detected. Activate the thread_db target
797  if this is the first process using it. */
798  if (thread_db_list->next == NULL)
800 
801  /* Enable event reporting, but not when debugging a core file. */
804 
805  return 1;
806 }
807 
808 /* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute,
809  relative, or just LIBTHREAD_DB. */
810 
811 static int
812 try_thread_db_load (const char *library, int check_auto_load_safe)
813 {
814  void *handle;
815  struct thread_db_info *info;
816 
817  if (libthread_db_debug)
819  _("Trying host libthread_db library: %s.\n"),
820  library);
821 
822  if (check_auto_load_safe)
823  {
824  if (access (library, R_OK) != 0)
825  {
826  /* Do not print warnings by file_is_auto_load_safe if the library does
827  not exist at this place. */
828  if (libthread_db_debug)
829  fprintf_unfiltered (gdb_stdlog, _("open failed: %s.\n"),
830  safe_strerror (errno));
831  return 0;
832  }
833 
834  if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db "
835  "library \"%s\" from explicit "
836  "directory.\n"),
837  library))
838  return 0;
839  }
840 
841  handle = dlopen (library, RTLD_NOW);
842  if (handle == NULL)
843  {
844  if (libthread_db_debug)
845  fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ());
846  return 0;
847  }
848 
849  if (libthread_db_debug && strchr (library, '/') == NULL)
850  {
851  void *td_init;
852 
853  td_init = dlsym (handle, "td_init");
854  if (td_init != NULL)
855  {
856  const char *const libpath = dladdr_to_soname (td_init);
857 
858  if (libpath != NULL)
859  fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"),
860  library, libpath);
861  }
862  }
863 
864  info = add_thread_db_info (handle);
865 
866  /* Do not save system library name, that one is always trusted. */
867  if (strchr (library, '/') != NULL)
868  info->filename = gdb_realpath (library);
869 
870  if (try_thread_db_load_1 (info))
871  return 1;
872 
873  /* This library "refused" to work on current inferior. */
875  return 0;
876 }
877 
878 /* Subroutine of try_thread_db_load_from_pdir to simplify it.
879  Try loading libthread_db in directory(OBJ)/SUBDIR.
880  SUBDIR may be NULL. It may also be something like "../lib64".
881  The result is true for success. */
882 
883 static int
884 try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir)
885 {
886  struct cleanup *cleanup;
887  char *path, *cp;
888  int result;
889  const char *obj_name = objfile_name (obj);
890 
891  if (obj_name[0] != '/')
892  {
893  warning (_("Expected absolute pathname for libpthread in the"
894  " inferior, but got %s."), obj_name);
895  return 0;
896  }
897 
898  path = xmalloc (strlen (obj_name) + (subdir ? strlen (subdir) + 1 : 0)
899  + 1 + strlen (LIBTHREAD_DB_SO) + 1);
900  cleanup = make_cleanup (xfree, path);
901 
902  strcpy (path, obj_name);
903  cp = strrchr (path, '/');
904  /* This should at minimum hit the first character. */
905  gdb_assert (cp != NULL);
906  cp[1] = '\0';
907  if (subdir != NULL)
908  {
909  strcat (cp, subdir);
910  strcat (cp, "/");
911  }
912  strcat (cp, LIBTHREAD_DB_SO);
913 
914  result = try_thread_db_load (path, 1);
915 
916  do_cleanups (cleanup);
917  return result;
918 }
919 
920 /* Handle $pdir in libthread-db-search-path.
921  Look for libthread_db in directory(libpthread)/SUBDIR.
922  SUBDIR may be NULL. It may also be something like "../lib64".
923  The result is true for success. */
924 
925 static int
926 try_thread_db_load_from_pdir (const char *subdir)
927 {
928  struct objfile *obj;
929 
930  if (!auto_load_thread_db)
931  return 0;
932 
933  ALL_OBJFILES (obj)
934  if (libpthread_name_p (objfile_name (obj)))
935  {
936  if (try_thread_db_load_from_pdir_1 (obj, subdir))
937  return 1;
938 
939  /* We may have found the separate-debug-info version of
940  libpthread, and it may live in a directory without a matching
941  libthread_db. */
942  if (obj->separate_debug_objfile_backlink != NULL)
944  subdir);
945 
946  return 0;
947  }
948 
949  return 0;
950 }
951 
952 /* Handle $sdir in libthread-db-search-path.
953  Look for libthread_db in the system dirs, or wherever a plain
954  dlopen(file_without_path) will look.
955  The result is true for success. */
956 
957 static int
959 {
961 }
962 
963 /* Try to load libthread_db from directory DIR of length DIR_LEN.
964  The result is true for success. */
965 
966 static int
967 try_thread_db_load_from_dir (const char *dir, size_t dir_len)
968 {
969  struct cleanup *cleanup;
970  char *path;
971  int result;
972 
973  if (!auto_load_thread_db)
974  return 0;
975 
976  path = xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1);
977  cleanup = make_cleanup (xfree, path);
978 
979  memcpy (path, dir, dir_len);
980  path[dir_len] = '/';
981  strcpy (path + dir_len + 1, LIBTHREAD_DB_SO);
982 
983  result = try_thread_db_load (path, 1);
984 
985  do_cleanups (cleanup);
986  return result;
987 }
988 
989 /* Search libthread_db_search_path for libthread_db which "agrees"
990  to work on current inferior.
991  The result is true for success. */
992 
993 static int
995 {
996  VEC (char_ptr) *dir_vec;
997  struct cleanup *cleanups;
998  char *this_dir;
999  int i, rc = 0;
1000 
1001  dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path);
1002  cleanups = make_cleanup_free_char_ptr_vec (dir_vec);
1003 
1004  for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i)
1005  {
1006  const int pdir_len = sizeof ("$pdir") - 1;
1007  size_t this_dir_len;
1008 
1009  this_dir_len = strlen (this_dir);
1010 
1011  if (strncmp (this_dir, "$pdir", pdir_len) == 0
1012  && (this_dir[pdir_len] == '\0'
1013  || this_dir[pdir_len] == '/'))
1014  {
1015  char *subdir = NULL;
1016  struct cleanup *free_subdir_cleanup
1017  = make_cleanup (null_cleanup, NULL);
1018 
1019  if (this_dir[pdir_len] == '/')
1020  {
1021  subdir = xmalloc (strlen (this_dir));
1022  make_cleanup (xfree, subdir);
1023  strcpy (subdir, this_dir + pdir_len + 1);
1024  }
1025  rc = try_thread_db_load_from_pdir (subdir);
1026  do_cleanups (free_subdir_cleanup);
1027  if (rc)
1028  break;
1029  }
1030  else if (strcmp (this_dir, "$sdir") == 0)
1031  {
1033  {
1034  rc = 1;
1035  break;
1036  }
1037  }
1038  else
1039  {
1040  if (try_thread_db_load_from_dir (this_dir, this_dir_len))
1041  {
1042  rc = 1;
1043  break;
1044  }
1045  }
1046  }
1047 
1048  do_cleanups (cleanups);
1049  if (libthread_db_debug)
1051  _("thread_db_load_search returning %d\n"), rc);
1052  return rc;
1053 }
1054 
1055 /* Return non-zero if the inferior has a libpthread. */
1056 
1057 static int
1059 {
1060  struct objfile *obj;
1061 
1062  ALL_OBJFILES (obj)
1063  if (libpthread_name_p (objfile_name (obj)))
1064  return 1;
1065 
1066  return 0;
1067 }
1068 
1069 /* Attempt to load and initialize libthread_db.
1070  Return 1 on success. */
1071 
1072 static int
1074 {
1075  struct thread_db_info *info;
1076 
1078 
1079  if (info != NULL)
1080  return 1;
1081 
1082  /* Don't attempt to use thread_db on executables not running
1083  yet. */
1084  if (!target_has_registers)
1085  return 0;
1086 
1087  /* Don't attempt to use thread_db for remote targets. */
1088  if (!(target_can_run (&current_target) || core_bfd))
1089  return 0;
1090 
1091  if (thread_db_load_search ())
1092  return 1;
1093 
1094  /* We couldn't find a libthread_db.
1095  If the inferior has a libpthread warn the user. */
1096  if (has_libpthread ())
1097  {
1098  warning (_("Unable to find libthread_db matching inferior's thread"
1099  " library, thread debugging will not be available."));
1100  return 0;
1101  }
1102 
1103  /* Either this executable isn't using libpthread at all, or it is
1104  statically linked. Since we can't easily distinguish these two cases,
1105  no warning is issued. */
1106  return 0;
1107 }
1108 
1109 static void
1111 {
1112  if (info->td_ta_clear_event_p != NULL)
1113  {
1114  td_thr_events_t events;
1115 
1116  /* Set the process wide mask saying we aren't interested in any
1117  events anymore. */
1118  td_event_fillset (&events);
1119  info->td_ta_clear_event_p (info->thread_agent, &events);
1120  }
1121 
1122  info->td_create_bp_addr = 0;
1123  info->td_death_bp_addr = 0;
1124 }
1125 
1126 static void
1128 {
1129  if (!thread_signals)
1130  {
1131  sigset_t mask;
1132  int i;
1133 
1135  sigemptyset (&thread_stop_set);
1136  sigemptyset (&thread_print_set);
1137 
1138  for (i = 1; i < NSIG; i++)
1139  {
1140  if (sigismember (&mask, i))
1141  {
1143  sigaddset (&thread_stop_set, i);
1145  sigaddset (&thread_print_set, i);
1146  thread_signals = 1;
1147  }
1148  }
1149  }
1150 }
1151 
1152 /* Check whether thread_db is usable. This function is called when
1153  an inferior is created (or otherwise acquired, e.g. attached to)
1154  and when new shared libraries are loaded into a running process. */
1155 
1156 void
1158 {
1159  /* Do nothing if we couldn't load libthread_db.so.1. */
1160  if (!thread_db_load ())
1161  return;
1162 }
1163 
1164 /* This function is called via the new_objfile observer. */
1165 
1166 static void
1168 {
1169  /* This observer must always be called with inferior_ptid set
1170  correctly. */
1171 
1172  if (objfile != NULL
1173  /* libpthread with separate debug info has its debug info file already
1174  loaded (and notified without successful thread_db initialization)
1175  the time observer_notify_new_objfile is called for the library itself.
1176  Static executables have their separate debug info loaded already
1177  before the inferior has started. */
1178  && objfile->separate_debug_objfile_backlink == NULL
1179  /* Only check for thread_db if we loaded libpthread,
1180  or if this is the main symbol file.
1181  We need to check OBJF_MAINLINE to handle the case of debugging
1182  a statically linked executable AND the symbol file is specified AFTER
1183  the exec file is loaded (e.g., gdb -c core ; file foo).
1184  For dynamically linked executables, libpthread can be near the end
1185  of the list of shared libraries to load, and in an app of several
1186  thousand shared libraries, this can otherwise be painful. */
1187  && ((objfile->flags & OBJF_MAINLINE) != 0
1188  || libpthread_name_p (objfile_name (objfile))))
1190 }
1191 
1192 static void
1194 {
1195  /* Check is only relevant for local targets targets. */
1197  {
1198  /* If the child is in a different PID namespace, its idea of its
1199  PID will differ from our idea of its PID. When we scan the
1200  child's thread list, we'll mistakenly think it has no threads
1201  since the thread PID fields won't match the PID we give to
1202  libthread_db. */
1204  {
1205  warning (_ ("Target and debugger are in different PID "
1206  "namespaces; thread lists and other data are "
1207  "likely unreliable"));
1208  }
1209  }
1210 }
1211 
1212 /* This function is called via the inferior_created observer.
1213  This handles the case of debugging statically linked executables. */
1214 
1215 static void
1216 thread_db_inferior_created (struct target_ops *target, int from_tty)
1217 {
1220 }
1221 
1222 /* Update the thread's state (what's displayed in "info threads"),
1223  from libthread_db thread state information. */
1224 
1225 static void
1227  const td_thrinfo_t *ti_p)
1228 {
1229  priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN
1230  || ti_p->ti_state == TD_THR_ZOMBIE);
1231 }
1232 
1233 /* Attach to a new thread. This function is called when we receive a
1234  TD_CREATE event or when we iterate over all threads and find one
1235  that wasn't already in our list. Returns true on success. */
1236 
1237 static int
1239  const td_thrinfo_t *ti_p)
1240 {
1241  struct thread_info *tp;
1242  struct thread_db_info *info;
1243 
1244  /* If we're being called after a TD_CREATE event, we may already
1245  know about this thread. There are two ways this can happen. We
1246  may have iterated over all threads between the thread creation
1247  and the TD_CREATE event, for instance when the user has issued
1248  the `info threads' command before the SIGTRAP for hitting the
1249  thread creation breakpoint was reported. Alternatively, the
1250  thread may have exited and a new one been created with the same
1251  thread ID. In the first case we don't need to do anything; in
1252  the second case we should discard information about the dead
1253  thread and attach to the new one. */
1254  tp = find_thread_ptid (ptid);
1255  if (tp != NULL)
1256  {
1257  /* If tp->priv is NULL, then GDB is already attached to this
1258  thread, but we do not know anything about it. We can learn
1259  about it here. This can only happen if we have some other
1260  way besides libthread_db to notice new threads (i.e.
1261  PTRACE_EVENT_CLONE); assume the same mechanism notices thread
1262  exit, so this can not be a stale thread recreated with the
1263  same ID. */
1264  if (tp->priv != NULL)
1265  {
1266  if (!tp->priv->dying)
1267  return 0;
1268 
1269  delete_thread (ptid);
1270  tp = NULL;
1271  }
1272  }
1273 
1274  /* Under GNU/Linux, we have to attach to each and every thread. */
1276  && tp == NULL)
1277  {
1278  int res;
1279 
1281  ti_p->ti_lid, 0));
1282  if (res < 0)
1283  {
1284  /* Error, stop iterating. */
1285  return 0;
1286  }
1287  else if (res > 0)
1288  {
1289  /* Pretend this thread doesn't exist yet, and keep
1290  iterating. */
1291  return 1;
1292  }
1293 
1294  /* Otherwise, we sucessfully attached to the thread. */
1295  }
1296 
1297  info = get_thread_db_info (ptid_get_pid (ptid));
1298  record_thread (info, tp, ptid, th_p, ti_p);
1299  return 1;
1300 }
1301 
1302 /* Record a new thread in GDB's thread list. Creates the thread's
1303  private info. If TP is NULL, creates a new thread. Otherwise,
1304  uses TP. */
1305 
1306 static void
1308  struct thread_info *tp,
1309  ptid_t ptid, const td_thrhandle_t *th_p,
1310  const td_thrinfo_t *ti_p)
1311 {
1312  td_err_e err;
1313  struct private_thread_info *priv;
1314  int new_thread = (tp == NULL);
1315 
1316  /* A thread ID of zero may mean the thread library has not
1317  initialized yet. Leave private == NULL until the thread library
1318  has initialized. */
1319  if (ti_p->ti_tid == 0)
1320  return;
1321 
1322  /* Construct the thread's private data. */
1323  priv = xmalloc (sizeof (struct private_thread_info));
1324  memset (priv, 0, sizeof (struct private_thread_info));
1325 
1326  priv->th = *th_p;
1327  priv->tid = ti_p->ti_tid;
1328  update_thread_state (priv, ti_p);
1329 
1330  /* Add the thread to GDB's thread list. If we already know about a
1331  thread with this PTID, but it's marked exited, then the kernel
1332  reused the tid of an old thread. */
1333  if (tp == NULL || tp->state == THREAD_EXITED)
1334  tp = add_thread_with_info (ptid, priv);
1335  else
1336  tp->priv = priv;
1337 
1338  /* Enable thread event reporting for this thread, except when
1339  debugging a core file. */
1340  if (target_has_execution && thread_db_use_events () && new_thread)
1341  {
1342  err = info->td_thr_event_enable_p (th_p, 1);
1343  if (err != TD_OK)
1344  error (_("Cannot enable thread event reporting for %s: %s"),
1345  target_pid_to_str (ptid), thread_db_err_str (err));
1346  }
1347 
1350 }
1351 
1352 static void
1354 {
1355  struct thread_info *thread_info;
1356 
1357  /* Don't delete the thread now, because it still reports as active
1358  until it has executed a few instructions after the event
1359  breakpoint - if we deleted it now, "info threads" would cause us
1360  to re-attach to it. Just mark it as having had a TD_DEATH
1361  event. This means that we won't delete it from our thread list
1362  until we notice that it's dead (via prune_threads), or until
1363  something re-uses its thread ID. We'll report the thread exit
1364  when the underlying LWP dies. */
1365  thread_info = find_thread_ptid (ptid);
1366  gdb_assert (thread_info != NULL && thread_info->priv != NULL);
1367  thread_info->priv->dying = 1;
1368 }
1369 
1370 static void
1371 thread_db_detach (struct target_ops *ops, const char *args, int from_tty)
1372 {
1373  struct target_ops *target_beneath = find_target_beneath (ops);
1374  struct thread_db_info *info;
1375 
1377 
1378  if (info)
1379  {
1381  {
1383 
1384  /* Delete the old thread event breakpoints. Note that
1385  unlike when mourning, we can remove them here because
1386  there's still a live inferior to poke at. In any case,
1387  GDB will not try to insert anything in the inferior when
1388  removing a breakpoint. */
1390  }
1391 
1393  }
1394 
1395  target_beneath->to_detach (target_beneath, args, from_tty);
1396 
1397  /* NOTE: From this point on, inferior_ptid is null_ptid. */
1398 
1399  /* If there are no more processes using libpthread, detach the
1400  thread_db target ops. */
1401  if (!thread_db_list)
1403 }
1404 
1405 /* Check if PID is currently stopped at the location of a thread event
1406  breakpoint location. If it is, read the event message and act upon
1407  the event. */
1408 
1409 static void
1411 {
1412  struct regcache *regcache = get_thread_regcache (ptid);
1413  struct gdbarch *gdbarch = get_regcache_arch (regcache);
1414  td_event_msg_t msg;
1415  td_thrinfo_t ti;
1416  td_err_e err;
1418  int loop = 0;
1419  struct thread_db_info *info;
1420 
1421  info = get_thread_db_info (ptid_get_pid (ptid));
1422 
1423  /* Bail out early if we're not at a thread event breakpoint. */
1424  stop_pc = regcache_read_pc (regcache);
1426  stop_pc -= gdbarch_decr_pc_after_break (gdbarch);
1427 
1428  if (stop_pc != info->td_create_bp_addr
1429  && stop_pc != info->td_death_bp_addr)
1430  return;
1431 
1432  /* Access an lwp we know is stopped. */
1433  info->proc_handle.ptid = ptid;
1434 
1435  /* If we have only looked at the first thread before libpthread was
1436  initialized, we may not know its thread ID yet. Make sure we do
1437  before we add another thread to the list. */
1438  if (!have_threads (ptid))
1440 
1441  /* If we are at a create breakpoint, we do not know what new lwp
1442  was created and cannot specifically locate the event message for it.
1443  We have to call td_ta_event_getmsg() to get
1444  the latest message. Since we have no way of correlating whether
1445  the event message we get back corresponds to our breakpoint, we must
1446  loop and read all event messages, processing them appropriately.
1447  This guarantees we will process the correct message before continuing
1448  from the breakpoint.
1449 
1450  Currently, death events are not enabled. If they are enabled,
1451  the death event can use the td_thr_event_getmsg() interface to
1452  get the message specifically for that lwp and avoid looping
1453  below. */
1454 
1455  loop = 1;
1456 
1457  do
1458  {
1459  err = info->td_ta_event_getmsg_p (info->thread_agent, &msg);
1460  if (err != TD_OK)
1461  {
1462  if (err == TD_NOMSG)
1463  return;
1464 
1465  error (_("Cannot get thread event message: %s"),
1466  thread_db_err_str (err));
1467  }
1468 
1469  err = info->td_thr_get_info_p (msg.th_p, &ti);
1470  if (err != TD_OK)
1471  error (_("Cannot get thread info: %s"), thread_db_err_str (err));
1472 
1473  ptid = ptid_build (ptid_get_pid (ptid), ti.ti_lid, 0);
1474 
1475  switch (msg.event)
1476  {
1477  case TD_CREATE:
1478  /* Call attach_thread whether or not we already know about a
1479  thread with this thread ID. */
1480  attach_thread (ptid, msg.th_p, &ti);
1481 
1482  break;
1483 
1484  case TD_DEATH:
1485 
1486  if (!in_thread_list (ptid))
1487  error (_("Spurious thread death event."));
1488 
1489  detach_thread (ptid);
1490 
1491  break;
1492 
1493  default:
1494  error (_("Spurious thread event."));
1495  }
1496  }
1497  while (loop);
1498 }
1499 
1500 static ptid_t
1502  ptid_t ptid, struct target_waitstatus *ourstatus,
1503  int options)
1504 {
1505  struct thread_db_info *info;
1506  struct target_ops *beneath = find_target_beneath (ops);
1507 
1508  ptid = beneath->to_wait (beneath, ptid, ourstatus, options);
1509 
1510  if (ourstatus->kind == TARGET_WAITKIND_IGNORE)
1511  return ptid;
1512 
1513  if (ourstatus->kind == TARGET_WAITKIND_EXITED
1514  || ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
1515  return ptid;
1516 
1517  info = get_thread_db_info (ptid_get_pid (ptid));
1518 
1519  /* If this process isn't using thread_db, we're done. */
1520  if (info == NULL)
1521  return ptid;
1522 
1523  if (ourstatus->kind == TARGET_WAITKIND_EXECD)
1524  {
1525  /* New image, it may or may not end up using thread_db. Assume
1526  not unless we find otherwise. */
1528  if (!thread_db_list)
1530 
1531  /* Thread event breakpoints are deleted by
1532  update_breakpoints_after_exec. */
1533 
1534  return ptid;
1535  }
1536 
1537  if (ourstatus->kind == TARGET_WAITKIND_STOPPED
1538  && ourstatus->value.sig == GDB_SIGNAL_TRAP)
1539  /* Check for a thread event. */
1540  check_event (ptid);
1541 
1542  /* Fill in the thread's user-level thread id and status. */
1543  thread_from_lwp (ptid);
1544 
1545  return ptid;
1546 }
1547 
1548 static void
1550 {
1551  struct target_ops *target_beneath = find_target_beneath (ops);
1552 
1554 
1555  target_beneath->to_mourn_inferior (target_beneath);
1556 
1557  /* Delete the old thread event breakpoints. Do this after mourning
1558  the inferior, so that we don't try to uninsert them. */
1560 
1561  /* Detach thread_db target ops. */
1562  if (!thread_db_list)
1563  unpush_target (ops);
1564 }
1565 
1566 struct callback_data
1567 {
1570 };
1571 
1572 static int
1574 {
1575  td_thrinfo_t ti;
1576  td_err_e err;
1577  ptid_t ptid;
1578  struct thread_info *tp;
1579  struct callback_data *cb_data = data;
1580  struct thread_db_info *info = cb_data->info;
1581 
1582  err = info->td_thr_get_info_p (th_p, &ti);
1583  if (err != TD_OK)
1584  error (_("find_new_threads_callback: cannot get thread info: %s"),
1585  thread_db_err_str (err));
1586 
1587  if (ti.ti_lid == -1)
1588  {
1589  /* A thread with kernel thread ID -1 is either a thread that
1590  exited and was joined, or a thread that is being created but
1591  hasn't started yet, and that is reusing the tcb/stack of a
1592  thread that previously exited and was joined. (glibc marks
1593  terminated and joined threads with kernel thread ID -1. See
1594  glibc PR17707. */
1595  if (libthread_db_debug)
1597  "thread_db: skipping exited and "
1598  "joined thread (0x%lx)\n", ti.ti_tid);
1599  return 0;
1600  }
1601 
1602  if (ti.ti_tid == 0)
1603  {
1604  /* A thread ID of zero means that this is the main thread, but
1605  glibc has not yet initialized thread-local storage and the
1606  pthread library. We do not know what the thread's TID will
1607  be yet. Just enable event reporting and otherwise ignore
1608  it. */
1609 
1610  /* In that case, we're not stopped in a fork syscall and don't
1611  need this glibc bug workaround. */
1613 
1615  {
1616  err = info->td_thr_event_enable_p (th_p, 1);
1617  if (err != TD_OK)
1618  error (_("Cannot enable thread event reporting for LWP %d: %s"),
1619  (int) ti.ti_lid, thread_db_err_str (err));
1620  }
1621 
1622  return 0;
1623  }
1624 
1625  /* Ignore stale parent threads, caused by glibc/BZ5983. This is a
1626  bit expensive, as it needs to open /proc/pid/status, so try to
1627  avoid doing the work if we know we don't have to. */
1629  {
1630  int tgid = linux_proc_get_tgid (ti.ti_lid);
1631 
1632  if (tgid != -1 && tgid != info->pid)
1633  return 0;
1634  }
1635 
1636  ptid = ptid_build (info->pid, ti.ti_lid, 0);
1637  tp = find_thread_ptid (ptid);
1638  if (tp == NULL || tp->priv == NULL)
1639  {
1640  if (attach_thread (ptid, th_p, &ti))
1641  cb_data->new_threads += 1;
1642  else
1643  /* Problem attaching this thread; perhaps it exited before we
1644  could attach it?
1645  This could mean that the thread list inside glibc itself is in
1646  inconsistent state, and libthread_db could go on looping forever
1647  (observed with glibc-2.3.6). To prevent that, terminate
1648  iteration: thread_db_find_new_threads_2 will retry. */
1649  return 1;
1650  }
1652  {
1653  /* Need to update this if not using the libthread_db events
1654  (particularly, the TD_DEATH event). */
1655  update_thread_state (tp->priv, &ti);
1656  }
1657 
1658  return 0;
1659 }
1660 
1661 /* Helper for thread_db_find_new_threads_2.
1662  Returns number of new threads found. */
1663 
1664 static int
1665 find_new_threads_once (struct thread_db_info *info, int iteration,
1666  td_err_e *errp)
1667 {
1668  struct callback_data data;
1669  td_err_e err = TD_ERR;
1670 
1671  data.info = info;
1672  data.new_threads = 0;
1673 
1674  /* See comment in thread_db_update_thread_list. */
1676 
1677  TRY
1678  {
1679  /* Iterate over all user-space threads to discover new threads. */
1680  err = info->td_ta_thr_iter_p (info->thread_agent,
1682  &data,
1685  TD_SIGNO_MASK,
1687  }
1688  CATCH (except, RETURN_MASK_ERROR)
1689  {
1690  if (libthread_db_debug)
1691  {
1692  exception_fprintf (gdb_stdlog, except,
1693  "Warning: find_new_threads_once: ");
1694  }
1695  }
1696  END_CATCH
1697 
1698  if (libthread_db_debug)
1699  {
1701  _("Found %d new threads in iteration %d.\n"),
1702  data.new_threads, iteration);
1703  }
1704 
1705  if (errp != NULL)
1706  *errp = err;
1707 
1708  return data.new_threads;
1709 }
1710 
1711 /* Search for new threads, accessing memory through stopped thread
1712  PTID. If UNTIL_NO_NEW is true, repeat searching until several
1713  searches in a row do not discover any new threads. */
1714 
1715 static void
1717 {
1718  td_err_e err = TD_OK;
1719  struct thread_db_info *info;
1720  int i, loop;
1721 
1722  info = get_thread_db_info (ptid_get_pid (ptid));
1723 
1724  /* Access an lwp we know is stopped. */
1725  info->proc_handle.ptid = ptid;
1726 
1727  if (until_no_new)
1728  {
1729  /* Require 4 successive iterations which do not find any new threads.
1730  The 4 is a heuristic: there is an inherent race here, and I have
1731  seen that 2 iterations in a row are not always sufficient to
1732  "capture" all threads. */
1733  for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop)
1734  if (find_new_threads_once (info, i, &err) != 0)
1735  {
1736  /* Found some new threads. Restart the loop from beginning. */
1737  loop = -1;
1738  }
1739  }
1740  else
1741  find_new_threads_once (info, 0, &err);
1742 
1743  if (err != TD_OK)
1744  error (_("Cannot find new threads: %s"), thread_db_err_str (err));
1745 }
1746 
1747 static void
1749 {
1750  thread_db_find_new_threads_2 (ptid, 0);
1751 }
1752 
1753 static int
1754 update_thread_core (struct lwp_info *info, void *closure)
1755 {
1756  info->core = linux_common_core_of_thread (info->ptid);
1757  return 0;
1758 }
1759 
1760 /* Update the thread list using td_ta_thr_iter. */
1761 
1762 static void
1764 {
1765  struct thread_db_info *info;
1766  struct inferior *inf;
1767 
1768  prune_threads ();
1769 
1770  ALL_INFERIORS (inf)
1771  {
1772  struct thread_info *thread;
1773 
1774  if (inf->pid == 0)
1775  continue;
1776 
1777  info = get_thread_db_info (inf->pid);
1778  if (info == NULL)
1779  continue;
1780 
1781  thread = any_live_thread_of_process (inf->pid);
1782  if (thread == NULL || thread->executing)
1783  continue;
1784 
1786  }
1787 }
1788 
1789 /* Implement the to_update_thread_list target method for this
1790  target. */
1791 
1792 static void
1794 {
1795  /* It's best to avoid td_ta_thr_iter if possible. That walks data
1796  structures in the inferior's address space that may be corrupted,
1797  or, if the target is running, the list may change while we walk
1798  it. In the latter case, it's possible that a thread exits just
1799  at the exact time that causes GDB to get stuck in an infinite
1800  loop. To avoid pausing all threads whenever the core wants to
1801  refresh the thread list, if the kernel supports clone events
1802  (meaning we're always already attached to all LWPs), we use
1803  thread_from_lwp immediately when we see an LWP stop. That uses
1804  thread_db entry points that do not walk libpthread's thread list,
1805  so should be safe, as well as more efficient. */
1807  ops->beneath->to_update_thread_list (ops->beneath);
1808  else
1810 
1812  iterate_over_lwps (minus_one_ptid /* iterate over all */,
1813  update_thread_core, NULL);
1814 }
1815 
1816 static char *
1818 {
1819  struct thread_info *thread_info = find_thread_ptid (ptid);
1820  struct target_ops *beneath;
1821 
1822  if (thread_info != NULL && thread_info->priv != NULL)
1823  {
1824  static char buf[64];
1825  thread_t tid;
1826 
1827  tid = thread_info->priv->tid;
1828  snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)",
1829  tid, ptid_get_lwp (ptid));
1830 
1831  return buf;
1832  }
1833 
1834  beneath = find_target_beneath (ops);
1835  return beneath->to_pid_to_str (beneath, ptid);
1836 }
1837 
1838 /* Return a string describing the state of the thread specified by
1839  INFO. */
1840 
1841 static char *
1843  struct thread_info *info)
1844 {
1845  if (info->priv == NULL)
1846  return NULL;
1847 
1848  if (info->priv->dying)
1849  return "Exiting";
1850 
1851  return NULL;
1852 }
1853 
1854 /* Get the address of the thread local variable in load module LM which
1855  is stored at OFFSET within the thread local storage for thread PTID. */
1856 
1857 static CORE_ADDR
1859  ptid_t ptid,
1860  CORE_ADDR lm,
1861  CORE_ADDR offset)
1862 {
1863  struct thread_info *thread_info;
1864  struct target_ops *beneath;
1865 
1866  /* If we have not discovered any threads yet, check now. */
1867  if (!have_threads (ptid))
1869 
1870  /* Find the matching thread. */
1871  thread_info = find_thread_ptid (ptid);
1872 
1873  if (thread_info != NULL && thread_info->priv != NULL)
1874  {
1875  td_err_e err;
1876  psaddr_t address;
1877  struct thread_db_info *info;
1878 
1879  info = get_thread_db_info (ptid_get_pid (ptid));
1880 
1881  /* Finally, get the address of the variable. */
1882  if (lm != 0)
1883  {
1884  /* glibc doesn't provide the needed interface. */
1885  if (!info->td_thr_tls_get_addr_p)
1887  _("No TLS library support"));
1888 
1889  /* Note the cast through uintptr_t: this interface only works if
1890  a target address fits in a psaddr_t, which is a host pointer.
1891  So a 32-bit debugger can not access 64-bit TLS through this. */
1892  err = info->td_thr_tls_get_addr_p (&thread_info->priv->th,
1893  (psaddr_t)(uintptr_t) lm,
1894  offset, &address);
1895  }
1896  else
1897  {
1898  /* If glibc doesn't provide the needed interface throw an error
1899  that LM is zero - normally cases it should not be. */
1900  if (!info->td_thr_tlsbase_p)
1902  _("TLS load module not found"));
1903 
1904  /* This code path handles the case of -static -pthread executables:
1905  https://sourceware.org/ml/libc-help/2014-03/msg00024.html
1906  For older GNU libc r_debug.r_map is NULL. For GNU libc after
1907  PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL.
1908  The constant number 1 depends on GNU __libc_setup_tls
1909  initialization of l_tls_modid to 1. */
1910  err = info->td_thr_tlsbase_p (&thread_info->priv->th,
1911  1, &address);
1912  address = (char *) address + offset;
1913  }
1914 
1915 #ifdef THREAD_DB_HAS_TD_NOTALLOC
1916  /* The memory hasn't been allocated, yet. */
1917  if (err == TD_NOTALLOC)
1918  /* Now, if libthread_db provided the initialization image's
1919  address, we *could* try to build a non-lvalue value from
1920  the initialization image. */
1922  _("TLS not allocated yet"));
1923 #endif
1924 
1925  /* Something else went wrong. */
1926  if (err != TD_OK)
1928  (("%s")), thread_db_err_str (err));
1929 
1930  /* Cast assuming host == target. Joy. */
1931  /* Do proper sign extension for the target. */
1932  gdb_assert (exec_bfd);
1933  return (bfd_get_sign_extend_vma (exec_bfd) > 0
1934  ? (CORE_ADDR) (intptr_t) address
1935  : (CORE_ADDR) (uintptr_t) address);
1936  }
1937 
1938  beneath = find_target_beneath (ops);
1939  return beneath->to_get_thread_local_address (beneath, ptid, lm, offset);
1940 }
1941 
1942 /* Implement the to_get_ada_task_ptid target method for this target. */
1943 
1944 static ptid_t
1945 thread_db_get_ada_task_ptid (struct target_ops *self, long lwp, long thread)
1946 {
1947  /* NPTL uses a 1:1 model, so the LWP id suffices. */
1948  return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0);
1949 }
1950 
1951 static void
1953  ptid_t ptid, int step, enum gdb_signal signo)
1954 {
1955  struct target_ops *beneath = find_target_beneath (ops);
1956  struct thread_db_info *info;
1957 
1958  if (ptid_equal (ptid, minus_one_ptid))
1960  else
1961  info = get_thread_db_info (ptid_get_pid (ptid));
1962 
1963  /* This workaround is only needed for child fork lwps stopped in a
1964  PTRACE_O_TRACEFORK event. When the inferior is resumed, the
1965  workaround can be disabled. */
1966  if (info)
1968 
1969  beneath->to_resume (beneath, ptid, step, signo);
1970 }
1971 
1972 /* qsort helper function for info_auto_load_libthread_db, sort the
1973  thread_db_info pointers primarily by their FILENAME and secondarily by their
1974  PID, both in ascending order. */
1975 
1976 static int
1977 info_auto_load_libthread_db_compare (const void *ap, const void *bp)
1978 {
1979  struct thread_db_info *a = *(struct thread_db_info **) ap;
1980  struct thread_db_info *b = *(struct thread_db_info **) bp;
1981  int retval;
1982 
1983  retval = strcmp (a->filename, b->filename);
1984  if (retval)
1985  return retval;
1986 
1987  return (a->pid > b->pid) - (a->pid - b->pid);
1988 }
1989 
1990 /* Implement 'info auto-load libthread-db'. */
1991 
1992 static void
1993 info_auto_load_libthread_db (char *args, int from_tty)
1994 {
1995  struct ui_out *uiout = current_uiout;
1996  const char *cs = args ? args : "";
1997  struct thread_db_info *info, **array;
1998  unsigned info_count, unique_filenames;
1999  size_t max_filename_len, max_pids_len, pids_len;
2000  struct cleanup *back_to;
2001  char *pids;
2002  int i;
2003 
2004  cs = skip_spaces_const (cs);
2005  if (*cs)
2006  error (_("'info auto-load libthread-db' does not accept any parameters"));
2007 
2008  info_count = 0;
2009  for (info = thread_db_list; info; info = info->next)
2010  if (info->filename != NULL)
2011  info_count++;
2012 
2013  array = xmalloc (sizeof (*array) * info_count);
2014  back_to = make_cleanup (xfree, array);
2015 
2016  info_count = 0;
2017  for (info = thread_db_list; info; info = info->next)
2018  if (info->filename != NULL)
2019  array[info_count++] = info;
2020 
2021  /* Sort ARRAY by filenames and PIDs. */
2022 
2023  qsort (array, info_count, sizeof (*array),
2025 
2026  /* Calculate the number of unique filenames (rows) and the maximum string
2027  length of PIDs list for the unique filenames (columns). */
2028 
2029  unique_filenames = 0;
2030  max_filename_len = 0;
2031  max_pids_len = 0;
2032  pids_len = 0;
2033  for (i = 0; i < info_count; i++)
2034  {
2035  int pid = array[i]->pid;
2036  size_t this_pid_len;
2037 
2038  for (this_pid_len = 0; pid != 0; pid /= 10)
2039  this_pid_len++;
2040 
2041  if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0)
2042  {
2043  unique_filenames++;
2044  max_filename_len = max (max_filename_len,
2045  strlen (array[i]->filename));
2046 
2047  if (i > 0)
2048  {
2049  pids_len -= strlen (", ");
2050  max_pids_len = max (max_pids_len, pids_len);
2051  }
2052  pids_len = 0;
2053  }
2054  pids_len += this_pid_len + strlen (", ");
2055  }
2056  if (i)
2057  {
2058  pids_len -= strlen (", ");
2059  max_pids_len = max (max_pids_len, pids_len);
2060  }
2061 
2062  /* Table header shifted right by preceding "libthread-db: " would not match
2063  its columns. */
2064  if (info_count > 0 && args == auto_load_info_scripts_pattern_nl)
2065  ui_out_text (uiout, "\n");
2066 
2067  make_cleanup_ui_out_table_begin_end (uiout, 2, unique_filenames,
2068  "LinuxThreadDbTable");
2069 
2070  ui_out_table_header (uiout, max_filename_len, ui_left, "filename",
2071  "Filename");
2072  ui_out_table_header (uiout, pids_len, ui_left, "PIDs", "Pids");
2073  ui_out_table_body (uiout);
2074 
2075  pids = xmalloc (max_pids_len + 1);
2076  make_cleanup (xfree, pids);
2077 
2078  /* Note I is incremented inside the cycle, not at its end. */
2079  for (i = 0; i < info_count;)
2080  {
2081  struct cleanup *chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
2082  char *pids_end;
2083 
2084  info = array[i];
2085  ui_out_field_string (uiout, "filename", info->filename);
2086  pids_end = pids;
2087 
2088  while (i < info_count && strcmp (info->filename, array[i]->filename) == 0)
2089  {
2090  if (pids_end != pids)
2091  {
2092  *pids_end++ = ',';
2093  *pids_end++ = ' ';
2094  }
2095  pids_end += xsnprintf (pids_end, &pids[max_pids_len + 1] - pids_end,
2096  "%u", array[i]->pid);
2097  gdb_assert (pids_end < &pids[max_pids_len + 1]);
2098 
2099  i++;
2100  }
2101  *pids_end = '\0';
2102 
2103  ui_out_field_string (uiout, "pids", pids);
2104 
2105  ui_out_text (uiout, "\n");
2106  do_cleanups (chain);
2107  }
2108 
2109  do_cleanups (back_to);
2110 
2111  if (info_count == 0)
2112  ui_out_message (uiout, 0, _("No auto-loaded libthread-db.\n"));
2113 }
2114 
2115 static void
2117 {
2118  thread_db_ops.to_shortname = "multi-thread";
2119  thread_db_ops.to_longname = "multi-threaded child process.";
2120  thread_db_ops.to_doc = "Threads and pthreads support.";
2134 
2136 }
2137 
2138 /* Provide a prototype to silence -Wmissing-prototypes. */
2140 
2141 void
2143 {
2144  init_thread_db_ops ();
2145 
2146  /* Defer loading of libthread_db.so until inferior is running.
2147  This allows gdb to load correct libthread_db for a given
2148  executable -- there could be mutiple versions of glibc,
2149  compiled with LinuxThreads or NPTL, and until there is
2150  a running inferior, we can't tell which libthread_db is
2151  the correct one to load. */
2152 
2154 
2155  add_setshow_optional_filename_cmd ("libthread-db-search-path",
2156  class_support,
2158 Set search path for libthread_db."), _("\
2159 Show the current search path or libthread_db."), _("\
2160 This path is used to search for libthread_db to be loaded into \
2161 gdb itself.\n\
2162 Its value is a colon (':') separate list of directories to search.\n\
2163 Setting the search path to an empty list resets it to its default value."),
2165  NULL,
2166  &setlist, &showlist);
2167 
2169  &libthread_db_debug, _("\
2170 Set libthread-db debugging."), _("\
2171 Show libthread-db debugging."), _("\
2172 When non-zero, libthread-db debugging is enabled."),
2173  NULL,
2176 
2177  add_setshow_boolean_cmd ("libthread-db", class_support,
2178  &auto_load_thread_db, _("\
2179 Enable or disable auto-loading of inferior specific libthread_db."), _("\
2180 Show whether auto-loading inferior specific libthread_db is enabled."), _("\
2181 If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\
2182 locations to load libthread_db compatible with the inferior.\n\
2183 Standard system libthread_db still gets loaded even with this option off.\n\
2184 This options has security implications for untrusted inferiors."),
2188 
2190  _("Print the list of loaded inferior specific libthread_db.\n\
2191 Usage: info auto-load libthread-db"),
2193 
2194  /* Add ourselves to objfile event chain. */
2196 
2197  /* Add ourselves to inferior_created event chain.
2198  This is needed to handle debugging statically linked programs where
2199  the new_objfile observer won't get called for libpthread. */
2201 }
td_err_e(* td_ta_new_p)(struct ps_prochandle *ps, td_thragent_t **ta)
unsigned int lwpid_t
struct gdbarch * target_gdbarch(void)
Definition: gdbarch.c:5143
static int try_thread_db_load_1(struct thread_db_info *info)
void linux_unstop_all_lwps(void)
Definition: linux-nat.c:2399
CORE_ADDR td_create_bp_addr
static void disable_thread_event_reporting(struct thread_db_info *info)
static void thread_db_resume(struct target_ops *ops, ptid_t ptid, int step, enum gdb_signal signo)
#define TD_THR_LOWEST_PRIORITY
static void thread_db_find_new_threads_1(ptid_t ptid)
struct private_thread_info * priv
Definition: gdbthread.h:270
#define target_has_registers
Definition: target.h:1710
static const char * dladdr_to_soname(const void *addr)
char * gdb_realpath(const char *filename)
Definition: utils.c:2840
struct thread_info * find_thread_ptid(ptid_t ptid)
Definition: thread.c:393
td_thragent_t * thread_agent
static int auto_load_thread_db
const char * to_longname
Definition: target.h:433
static int update_thread_core(struct lwp_info *info, void *closure)
int linux_proc_task_list_dir_exists(pid_t pid)
Definition: linux-procfs.c:249
union td_notify::@115 u
static struct target_ops thread_db_ops
void add_setshow_zuinteger_cmd(const char *name, enum command_class theclass, unsigned int *var, const char *set_doc, const char *show_doc, const char *help_doc, cmd_sfunc_ftype *set_func, show_value_ftype *show_func, struct cmd_list_element **set_list, struct cmd_list_element **show_list)
Definition: cli-decode.c:763
static int thread_db_find_new_threads_silently(ptid_t ptid)
int ptid_equal(ptid_t ptid1, ptid_t ptid2)
Definition: ptid.c:76
bfd_vma CORE_ADDR
Definition: common-types.h:41
void lin_thread_get_thread_signals(sigset_t *set)
Definition: linux-nat.c:5202
psaddr_t bptaddr
struct regcache * get_thread_regcache(ptid_t ptid)
Definition: regcache.c:529
td_err_e(* td_ta_map_lwp2thr_p)(const td_thragent_t *ta, lwpid_t lwpid, td_thrhandle_t *th)
void delete_thread(ptid_t)
Definition: thread.c:368
static void thread_db_mourn_inferior(struct target_ops *ops)
void xfree(void *)
Definition: common-utils.c:97
struct objfile * separate_debug_objfile_backlink
Definition: objfiles.h:401
#define ALL_LWPS(LP)
Definition: linux-nat.h:123
struct gdbarch * get_regcache_arch(const struct regcache *regcache)
Definition: regcache.c:297
#define BMSYMBOL_VALUE_ADDRESS(symbol)
Definition: symtab.h:393
void warning(const char *fmt,...)
Definition: errors.c:26
CORE_ADDR td_death_bp_addr
char *(* to_pid_to_str)(struct target_ops *, ptid_t) TARGET_DEFAULT_FUNC(default_pid_to_str)
Definition: target.h:631
static int try_thread_db_load_from_dir(const char *dir, size_t dir_len)
int lin_lwp_attach_lwp(ptid_t ptid)
Definition: linux-nat.c:1054
tuple inf
Definition: arm-linux.py:13
ptid_t ptid
Definition: linux-nat.h:34
struct cleanup * make_cleanup_ui_out_table_begin_end(struct ui_out *ui_out, int nr_cols, int nr_rows, const char *tblid)
Definition: ui-out.c:369
void push_target(struct target_ops *t)
Definition: target.c:664
static void * verbose_dlsym(void *handle, const char *name)
char *(* to_extra_thread_info)(struct target_ops *, struct thread_info *) TARGET_DEFAULT_RETURN(NULL)
Definition: target.h:633
static void init_thread_db_ops(void)
static void thread_db_update_thread_list_td_ta_thr_iter(struct target_ops *ops)
struct ui_file * gdb_stdout
Definition: main.c:71
struct thread_info * add_thread_with_info(ptid_t ptid, struct private_thread_info *)
Definition: thread.c:291
int pid
Definition: inferior.h:299
int unpush_target(struct target_ops *t)
Definition: target.c:711
static void check_thread_signals(void)
#define target_supports_stopped_by_sw_breakpoint()
Definition: target.h:1838
struct cmd_list_element ** auto_load_set_cmdlist_get(void)
Definition: auto-load.c:1507
static int have_threads(ptid_t ptid)
#define target_can_run(t)
Definition: target.h:1624
static void info_auto_load_libthread_db(char *args, int from_tty)
char auto_load_info_scripts_pattern_nl[]
Definition: auto-load.c:1299
int need_stale_parent_threads_check
struct breakpoint * create_thread_event_breakpoint(struct gdbarch *gdbarch, CORE_ADDR address)
Definition: breakpoint.c:7620
#define VEC(T)
Definition: vec.h:398
ptid_t(* to_wait)(struct target_ops *, ptid_t, struct target_waitstatus *, int TARGET_DEBUG_PRINTER(target_debug_print_options)) TARGET_DEFAULT_NORETURN(noprocess())
Definition: target.h:468
char * target_pid_to_str(ptid_t ptid)
Definition: target.c:2233
#define _(String)
Definition: gdb_locale.h:40
static int have_threads_callback(struct thread_info *thread, void *args)
thread_t ti_tid
Definition: ui-out.h:40
char * char_ptr
Definition: gdb_vecs.h:25
static ptid_t thread_db_wait(struct target_ops *ops, ptid_t ptid, struct target_waitstatus *ourstatus, int options)
td_err_e(* td_ta_set_event_p)(const td_thragent_t *ta, td_thr_events_t *event)
static int info_auto_load_libthread_db_compare(const void *ap, const void *bp)
#define END_CATCH
Definition: ui-out.c:99
#define OBJF_MAINLINE
Definition: objfiles.h:455
td_err_e(* td_ta_thr_iter_p)(const td_thragent_t *ta, td_thr_iter_f *callback, void *cbdata_p, td_thr_state_e state, int ti_pri, sigset_t *ti_sigmask_p, unsigned int ti_user_flags)
void ui_out_text(struct ui_out *uiout, const char *string)
Definition: ui-out.c:582
td_err_e td_init(void)
int thread_db_notice_clone(ptid_t parent, ptid_t child)
Definition: ptid.h:35
static void thread_from_lwp(ptid_t ptid)
ptid_t ptid_build(int pid, long lwp, long tid)
Definition: ptid.c:31
#define ALL_INFERIORS(I)
Definition: inferior.h:504
void null_cleanup(void *arg)
Definition: cleanups.c:295
struct observer * observer_attach_inferior_created(observer_inferior_created_ftype *f)
#define TRY
int in_thread_list(ptid_t ptid)
Definition: thread.c:482
initialize_file_ftype _initialize_thread_db
#define td_event_addset(setp, n)
struct thread_info * iterate_over_threads(thread_callback_func, void *)
Definition: thread.c:419
static void detach_thread(ptid_t ptid)
struct cmd_list_element * setlist
Definition: cli-cmds.c:135
const char *const name
Definition: aarch64-tdep.c:68
#define ALL_OBJFILES(obj)
Definition: objfiles.h:579
static int try_thread_db_load_from_pdir_1(struct objfile *obj, const char *subdir)
#define VEC_iterate(T, V, I, P)
Definition: vec.h:165
#define OPS_MAGIC
Definition: target.h:1233
CORE_ADDR gdbarch_decr_pc_after_break(struct gdbarch *gdbarch)
Definition: gdbarch.c:2754
static int inferior_has_bug(const char *ver_symbol, int ver_major_min, int ver_minor_min)
static int thread_db_load(void)
#define CATCH(EXCEPTION, MASK)
static td_err_e enable_thread_event(int event, CORE_ADDR *bp)
#define td_event_emptyset(setp)
int linux_supports_traceclone(void)
Definition: linux-ptrace.c:546
struct target_ops current_target
void initialize_file_ftype(void)
Definition: defs.h:281
struct thread_db_info * info
int linux_ns_same(pid_t pid, enum linux_ns_type type)
struct cleanup * make_cleanup_ui_out_tuple_begin_end(struct ui_out *uiout, const char *id)
Definition: ui-out.c:451
void remove_thread_event_breakpoints(void)
Definition: breakpoint.c:7638
int td_thr_iter_f(const td_thrhandle_t *, void *)
void complete_target_initialization(struct target_ops *t)
Definition: target.c:317
#define exec_bfd
Definition: exec.h:32
void fprintf_filtered(struct ui_file *stream, const char *format,...)
Definition: utils.c:2351
mach_port_t mach_port_t name mach_port_t mach_port_t name error_t err
Definition: gnu-nat.c:1816
const char * skip_spaces_const(const char *chp)
Definition: common-utils.c:271
enum gdb_signal sig
Definition: waitstatus.h:108
struct thread_info * any_live_thread_of_process(int pid)
Definition: thread.c:528
CORE_ADDR gdbarch_convert_from_func_ptr_addr(struct gdbarch *gdbarch, CORE_ADDR addr, struct target_ops *targ)
Definition: gdbarch.c:2975
void fprintf_unfiltered(struct ui_file *stream, const char *format,...)
Definition: utils.c:2361
mach_port_t notify
Definition: gnu-nat.c:1805
void(* to_resume)(struct target_ops *, ptid_t, int TARGET_DEBUG_PRINTER(target_debug_print_step), enum gdb_signal) TARGET_DEFAULT_NORETURN(noprocess())
Definition: target.h:464
struct cmd_list_element * showlist
Definition: cli-cmds.c:143
void ui_out_message(struct ui_out *uiout, int verbosity, const char *format,...)
Definition: ui-out.c:589
td_err_e(* td_thr_event_enable_p)(const td_thrhandle_t *th, int event)
struct cmd_list_element * add_cmd(const char *name, enum command_class theclass, cmd_cfunc_ftype *fun, const char *doc, struct cmd_list_element **list)
Definition: cli-decode.c:192
psaddr_t th_unique
#define TD_SIGNO_MASK
CORE_ADDR(* to_get_thread_local_address)(struct target_ops *ops, ptid_t ptid, CORE_ADDR load_module_addr, CORE_ADDR offset) TARGET_DEFAULT_NORETURN(generic_tls_error())
Definition: target.h:689
static void enable_thread_event_reporting(void)
struct cleanup * make_cleanup(make_cleanup_ftype *function, void *arg)
Definition: cleanups.c:117
union target_waitstatus::@161 value
struct td_thragent td_thragent_t
const char version[]
Definition: version.c:2
int linux_proc_get_tgid(pid_t lwpid)
Definition: linux-procfs.c:60
struct cleanup * make_cleanup_free_char_ptr_vec(VEC(char_ptr)*char_ptr_vec)
Definition: utils.c:3215
enum gdb_signal gdb_signal_from_host(int)
Definition: signals.c:116
struct ps_prochandle proc_handle
static int find_new_threads_callback(const td_thrhandle_t *th_p, void *data)
#define gdb_assert(expr)
Definition: gdb_assert.h:33
#define LIBTHREAD_DB_SO
Definition: gdb_thread_db.h:8
#define td_event_fillset(setp)
static sigset_t thread_print_set
int linux_common_core_of_thread(ptid_t ptid)
Definition: linux-osdata.c:61
void exception_fprintf(struct ui_file *file, struct gdb_exception e, const char *prefix,...)
Definition: exceptions.c:119
const char * to_doc
Definition: target.h:434
static int thread_db_load_search(void)
td_thr_state_e
#define target_has_execution
Definition: target.h:1726
static void thread_db_inferior_created(struct target_ops *target, int from_tty)
static void thread_db_update_thread_list(struct target_ops *ops)
void linux_stop_and_wait_all_lwps(void)
Definition: linux-nat.c:2386
void * psaddr_t
struct target_ops * find_target_beneath(struct target_ops *t)
Definition: target.c:3148
td_err_e(* td_thr_tls_get_addr_p)(const td_thrhandle_t *th, psaddr_t map_address, size_t offset, psaddr_t *address)
int file_is_auto_load_safe(const char *filename, const char *debug_fmt,...)
Definition: auto-load.c:477
static struct thread_db_info * add_thread_db_info(void *handle)
static struct thread_info * new_thread(ptid_t ptid)
Definition: thread.c:221
static int try_thread_db_load(const char *library, int check_auto_load_safe)
void printf_unfiltered(const char *format,...)
Definition: utils.c:2399
struct cmd_list_element * setdebuglist
Definition: cli-cmds.c:173
void(* to_detach)(struct target_ops *ops, const char *, int) TARGET_DEFAULT_IGNORE()
Definition: target.h:460
const char * objfile_name(const struct objfile *objfile)
Definition: objfiles.c:1499
int core
Definition: linux-nat.h:104
void * xmalloc(YYSIZE_T)
struct ui_file * gdb_stdlog
Definition: main.c:73
td_err_e(* td_thr_get_info_p)(const td_thrhandle_t *th, td_thrinfo_t *infop)
static int find_new_threads_once(struct thread_db_info *info, int iteration, td_err_e *errp)
pthread_t thread_t
td_err_e(* td_ta_event_getmsg_p)(const td_thragent_t *ta, td_event_msg_t *msg)
void check_for_thread_db(void)
#define TD_THR_ANY_USER_FLAGS
static void delete_thread_db_info(int pid)
Definition: value.c:172
td_err_e(* td_thr_tlsbase_p)(const td_thrhandle_t *th, unsigned long int modid, psaddr_t *base)
int ptid_get_pid(ptid_t ptid)
Definition: ptid.c:52
pthdb_tid_t tid
Definition: aix-thread.c:89
td_event_e
static ptid_t thread_db_get_ada_task_ptid(struct target_ops *self, long lwp, long thread)
static void show_auto_load_thread_db(struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value)
void(* to_mourn_inferior)(struct target_ops *) TARGET_DEFAULT_FUNC(default_mourn_inferior)
Definition: target.h:607
#define max(a, b)
Definition: defs.h:109
static void thread_db_find_new_threads_2(ptid_t ptid, int until_no_new)
void prune_threads(void)
Definition: thread.c:626
ptid_t ptid
Definition: gdbthread.h:169
int xsnprintf(char *str, size_t size, const char *format,...)
Definition: common-utils.c:134
static char * thread_db_pid_to_str(struct target_ops *ops, ptid_t ptid)
static void thread_db_detach(struct target_ops *ops, const char *args, int from_tty)
enum target_waitkind kind
Definition: waitstatus.h:100
struct ui_file * gdb_stderr
Definition: main.c:72
CORE_ADDR regcache_read_pc(struct regcache *regcache)
Definition: regcache.c:1174
ptid_t inferior_ptid
Definition: infcmd.c:124
struct minimal_symbol * minsym
Definition: minsyms.h:32
char * safe_strerror(int)
enum strata to_stratum
Definition: target.h:650
td_err_e(* td_ta_clear_event_p)(const td_thragent_t *ta, td_thr_events_t *event)
int libpthread_name_p(const char *name)
Definition: solib.c:942
int offset
Definition: agent.c:65
#define qsort
Definition: ada-exp.c:2747
CORE_ADDR stop_pc
Definition: infcmd.c:128
void ui_out_table_header(struct ui_out *uiout, int width, enum ui_align alignment, const char *col_name, const char *colhdr)
Definition: ui-out.c:346
static void show_libthread_db_debug(struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value)
static void record_thread(struct thread_db_info *info, struct thread_info *tp, ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p)
struct thread_db_info * thread_db_list
mach_port_t kern_return_t mach_port_t msgports mach_port_t kern_return_t pid_t pid mach_port_t kern_return_t mach_port_t task mach_port_t kern_return_t int procinfo_t mach_msg_type_number_t data_t mach_msg_type_number_t threadwaitsCnt mach_port_t kern_return_t data_t mach_msg_type_number_t procenvCnt mach_port_t kern_return_t pidarray_t pids
Definition: gnu-nat.c:1897
static int has_libpthread(void)
static int thread_db_use_events(void)
const char * to_shortname
Definition: target.h:432
static char * libthread_db_search_path
static void check_event(ptid_t ptid)
static int try_thread_db_load_from_pdir(const char *subdir)
static CORE_ADDR thread_db_get_thread_local_address(struct target_ops *ops, ptid_t ptid, CORE_ADDR lm, CORE_ADDR offset)
static void set_libthread_db_search_path(char *ignored, int from_tty, struct cmd_list_element *c)
int to_magic
Definition: target.h:1224
static int try_thread_db_load_from_sdir(void)
struct observer * observer_attach_new_objfile(observer_new_objfile_ftype *f)
long ptid_get_lwp(ptid_t ptid)
Definition: ptid.c:60
enum thread_state state
Definition: gdbthread.h:189
struct cmd_list_element * showdebuglist
Definition: cli-cmds.c:175
int signal_print_update(int signo, int state)
Definition: infrun.c:6825
td_err_e(* td_ta_event_addr_p)(const td_thragent_t *ta, td_event_e event, td_notify_t *ptr)
void ui_out_field_string(struct ui_out *uiout, const char *fldname, const char *string)
Definition: ui-out.c:541
unsigned short flags
Definition: objfiles.h:282
static void update_thread_state(struct private_thread_info *priv, const td_thrinfo_t *ti_p)
struct thread_db_info * next
bfd * core_bfd
Definition: corefile.c:58
static unsigned int libthread_db_debug
int to_has_thread_control
Definition: target.h:656
static void thread_db_new_objfile(struct objfile *objfile)
void ui_out_table_body(struct ui_out *uiout)
Definition: ui-out.c:309
const td_thrhandle_t * th_p
int signal_stop_update(int signo, int state)
Definition: infrun.c:6815
struct ui_out * current_uiout
Definition: ui-out.c:233
struct cmd_list_element ** auto_load_show_cmdlist_get(void)
Definition: auto-load.c:1534
static void check_pid_namespace_match(void)
void(* to_update_thread_list)(struct target_ops *) TARGET_DEFAULT_IGNORE()
Definition: target.h:629
td_event_e event
static int attach_thread(ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p)
struct lwp_info * iterate_over_lwps(ptid_t filter, iterate_over_lwps_ftype callback, void *data)
Definition: linux-nat.c:910
struct bound_minimal_symbol lookup_minimal_symbol(const char *name, const char *sfile, struct objfile *objf)
Definition: minsyms.c:163
int executing
Definition: gdbthread.h:182
PTR xcalloc(size_t number, size_t size)
Definition: common-utils.c:71
td_err_e(* td_init_p)(void)
static char * thread_db_extra_thread_info(struct target_ops *self, struct thread_info *info)
ptid_t(* to_get_ada_task_ptid)(struct target_ops *, long lwp, long thread) TARGET_DEFAULT_FUNC(default_get_ada_task_ptid)
Definition: target.h:776
int target_read_string(CORE_ADDR memaddr, char **string, int len, int *errnop)
Definition: target.c:915
td_thr_state_e ti_state
void error(const char *fmt,...)
Definition: errors.c:38
#define LIBTHREAD_DB_SEARCH_PATH
Definition: gdb_thread_db.h:15
ptid_t minus_one_ptid
Definition: ptid.c:26
void add_setshow_optional_filename_cmd(const char *name, enum command_class theclass, char **var, const char *set_doc, const char *show_doc, const char *help_doc, cmd_sfunc_ftype *set_func, show_value_ftype *show_func, struct cmd_list_element **set_list, struct cmd_list_element **show_list)
Definition: cli-decode.c:626
mach_port_t mach_port_t name mach_port_t mach_port_t name error_t int int rusage_t pid_t pid
Definition: gnu-nat.c:1818
void throw_error(enum errors error, const char *fmt,...)
static struct thread_db_info * get_thread_db_info(int pid)
struct target_ops * beneath
Definition: target.h:431
void do_cleanups(struct cleanup *old_chain)
Definition: cleanups.c:175
void add_setshow_boolean_cmd(const char *name, enum command_class theclass, int *var, const char *set_doc, const char *show_doc, const char *help_doc, cmd_sfunc_ftype *set_func, show_value_ftype *show_func, struct cmd_list_element **set_list, struct cmd_list_element **show_list)
Definition: cli-decode.c:541
static sigset_t thread_stop_set
struct cmd_list_element ** auto_load_info_cmdlist_get(void)
Definition: auto-load.c:1585
static char * thread_db_err_str(td_err_e err)
lwpid_t ti_lid
td_err_e
static int thread_signals