1 /* libthread_db assisted debugging support, generic parts.
3 Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "gdb_assert.h"
25 #include "gdb_proc_service.h"
26 #include "gdb_thread_db.h"
29 #include "exceptions.h"
30 #include "gdbthread.h"
36 #include "solib-svr4.h"
39 #include "linux-nat.h"
43 #ifdef HAVE_GNU_LIBC_VERSION_H
44 #include <gnu/libc-version.h>
47 #ifndef LIBTHREAD_DB_SO
48 #define LIBTHREAD_DB_SO "libthread_db.so.1"
51 /* If we're running on GNU/Linux, we must explicitly attach to any new
54 /* This module's target vector. */
55 static struct target_ops thread_db_ops
;
57 /* The target vector that we call for things this module can't handle. */
58 static struct target_ops
*target_beneath
;
60 /* Non-zero if we're using this module's target vector. */
61 static int using_thread_db
;
63 /* Non-zero if we have determined the signals used by the threads
65 static int thread_signals
;
66 static sigset_t thread_stop_set
;
67 static sigset_t thread_print_set
;
69 /* Structure that identifies the child process for the
70 <proc_service.h> interface. */
71 static struct ps_prochandle proc_handle
;
73 /* Connection to the libthread_db library. */
74 static td_thragent_t
*thread_agent
;
76 /* Pointers to the libthread_db functions. */
78 static td_err_e (*td_init_p
) (void);
80 static td_err_e (*td_ta_new_p
) (struct ps_prochandle
* ps
,
82 static td_err_e (*td_ta_map_id2thr_p
) (const td_thragent_t
*ta
, thread_t pt
,
83 td_thrhandle_t
*__th
);
84 static td_err_e (*td_ta_map_lwp2thr_p
) (const td_thragent_t
*ta
,
85 lwpid_t lwpid
, td_thrhandle_t
*th
);
86 static td_err_e (*td_ta_thr_iter_p
) (const td_thragent_t
*ta
,
87 td_thr_iter_f
*callback
, void *cbdata_p
,
88 td_thr_state_e state
, int ti_pri
,
89 sigset_t
*ti_sigmask_p
,
90 unsigned int ti_user_flags
);
91 static td_err_e (*td_ta_event_addr_p
) (const td_thragent_t
*ta
,
92 td_event_e event
, td_notify_t
*ptr
);
93 static td_err_e (*td_ta_set_event_p
) (const td_thragent_t
*ta
,
94 td_thr_events_t
*event
);
95 static td_err_e (*td_ta_event_getmsg_p
) (const td_thragent_t
*ta
,
98 static td_err_e (*td_thr_validate_p
) (const td_thrhandle_t
*th
);
99 static td_err_e (*td_thr_get_info_p
) (const td_thrhandle_t
*th
,
100 td_thrinfo_t
*infop
);
101 static td_err_e (*td_thr_event_enable_p
) (const td_thrhandle_t
*th
,
104 static td_err_e (*td_thr_tls_get_addr_p
) (const td_thrhandle_t
*th
,
106 size_t offset
, void **address
);
108 /* Location of the thread creation event breakpoint. The code at this
109 location in the child process will be called by the pthread library
110 whenever a new thread is created. By setting a special breakpoint
111 at this location, GDB can detect when a new thread is created. We
112 obtain this location via the td_ta_event_addr call. */
113 static CORE_ADDR td_create_bp_addr
;
115 /* Location of the thread death event breakpoint. */
116 static CORE_ADDR td_death_bp_addr
;
118 /* Prototypes for local functions. */
119 static void thread_db_find_new_threads (void);
120 static void attach_thread (ptid_t ptid
, const td_thrhandle_t
*th_p
,
121 const td_thrinfo_t
*ti_p
, int verbose
);
122 static void detach_thread (ptid_t ptid
, int verbose
);
125 /* Building process ids. */
127 #define GET_PID(ptid) ptid_get_pid (ptid)
128 #define GET_LWP(ptid) ptid_get_lwp (ptid)
129 #define GET_THREAD(ptid) ptid_get_tid (ptid)
131 #define is_lwp(ptid) (GET_LWP (ptid) != 0)
132 #define is_thread(ptid) (GET_THREAD (ptid) != 0)
134 #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
137 /* Use "struct private_thread_info" to cache thread state. This is
138 a substantial optimization. */
140 struct private_thread_info
142 /* Flag set when we see a TD_DEATH event for this thread. */
143 unsigned int dying
:1;
145 /* Cached thread state. */
146 unsigned int th_valid
:1;
147 unsigned int ti_valid
:1;
155 thread_db_err_str (td_err_e err
)
162 return "generic 'call succeeded'";
164 return "generic error";
166 return "no thread to satisfy query";
168 return "no sync handle to satisfy query";
170 return "no LWP to satisfy query";
172 return "invalid process handle";
174 return "invalid thread handle";
176 return "invalid synchronization handle";
178 return "invalid thread agent";
180 return "invalid key";
182 return "no event message for getmsg";
184 return "FPU register set not available";
186 return "application not linked with libthread";
188 return "requested event is not supported";
190 return "capability not available";
192 return "debugger service failed";
194 return "operation not applicable to";
196 return "no thread-specific data for this thread";
198 return "malloc failed";
200 return "only part of register set was written/read";
202 return "X register set not available for this thread";
203 #ifdef THREAD_DB_HAS_TD_NOTALLOC
205 return "thread has not yet allocated TLS for given module";
207 #ifdef THREAD_DB_HAS_TD_VERSION
209 return "versions of libpthread and libthread_db do not match";
211 #ifdef THREAD_DB_HAS_TD_NOTLS
213 return "there is no TLS segment in the given module";
216 snprintf (buf
, sizeof (buf
), "unknown thread_db error '%d'", err
);
221 /* Return 1 if any threads have been registered. There may be none if
222 the threading library is not fully initialized yet. */
225 have_threads_callback (struct thread_info
*thread
, void *dummy
)
233 return iterate_over_threads (have_threads_callback
, NULL
) != NULL
;
236 /* A callback function for td_ta_thr_iter, which we use to map all
239 THP is a handle to the current thread; if INFOP is not NULL, the
240 struct thread_info associated with this thread is returned in
243 If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise,
244 zero is returned to indicate success. */
247 thread_get_info_callback (const td_thrhandle_t
*thp
, void *infop
)
251 struct thread_info
*thread_info
;
254 err
= td_thr_get_info_p (thp
, &ti
);
256 error (_("thread_get_info_callback: cannot get thread info: %s"),
257 thread_db_err_str (err
));
259 /* Fill the cache. */
260 thread_ptid
= ptid_build (GET_PID (inferior_ptid
), ti
.ti_lid
, ti
.ti_tid
);
261 thread_info
= find_thread_pid (thread_ptid
);
263 /* In the case of a zombie thread, don't continue. We don't want to
264 attach to it thinking it is a new thread. */
265 if (ti
.ti_state
== TD_THR_UNKNOWN
|| ti
.ti_state
== TD_THR_ZOMBIE
)
268 *(struct thread_info
**) infop
= thread_info
;
269 if (thread_info
!= NULL
)
271 memcpy (&thread_info
->private->th
, thp
, sizeof (*thp
));
272 thread_info
->private->th_valid
= 1;
273 memcpy (&thread_info
->private->ti
, &ti
, sizeof (ti
));
274 thread_info
->private->ti_valid
= 1;
276 return TD_THR_ZOMBIE
;
279 if (thread_info
== NULL
)
281 /* New thread. Attach to it now (why wait?). */
282 attach_thread (thread_ptid
, thp
, &ti
, 1);
283 thread_info
= find_thread_pid (thread_ptid
);
284 gdb_assert (thread_info
!= NULL
);
287 memcpy (&thread_info
->private->th
, thp
, sizeof (*thp
));
288 thread_info
->private->th_valid
= 1;
289 memcpy (&thread_info
->private->ti
, &ti
, sizeof (ti
));
290 thread_info
->private->ti_valid
= 1;
293 *(struct thread_info
**) infop
= thread_info
;
298 /* Accessor functions for the thread_db information, with caching. */
301 thread_db_map_id2thr (struct thread_info
*thread_info
, int fatal
)
305 if (thread_info
->private->th_valid
)
308 err
= td_ta_map_id2thr_p (thread_agent
, GET_THREAD (thread_info
->ptid
),
309 &thread_info
->private->th
);
313 error (_("Cannot find thread %ld: %s"),
314 (long) GET_THREAD (thread_info
->ptid
),
315 thread_db_err_str (err
));
318 thread_info
->private->th_valid
= 1;
321 /* Convert between user-level thread ids and LWP ids. */
324 thread_from_lwp (ptid_t ptid
)
328 struct thread_info
*thread_info
;
331 if (GET_LWP (ptid
) == 0)
332 ptid
= BUILD_LWP (GET_PID (ptid
), GET_PID (ptid
));
334 gdb_assert (is_lwp (ptid
));
336 err
= td_ta_map_lwp2thr_p (thread_agent
, GET_LWP (ptid
), &th
);
338 error (_("Cannot find user-level thread for LWP %ld: %s"),
339 GET_LWP (ptid
), thread_db_err_str (err
));
343 /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the
344 event thread has already died. If another gdb interface has called
345 thread_alive() previously, the thread won't be found on the thread list
346 anymore. In that case, we don't want to process this ptid anymore
347 to avoid the possibility of later treating it as a newly
348 discovered thread id that we should add to the list. Thus,
349 we return a -1 ptid which is also how the thread list marks a
351 if (thread_get_info_callback (&th
, &thread_info
) == TD_THR_ZOMBIE
352 && thread_info
== NULL
)
353 return pid_to_ptid (-1);
355 gdb_assert (thread_info
&& thread_info
->private->ti_valid
);
357 return ptid_build (GET_PID (ptid
), GET_LWP (ptid
),
358 thread_info
->private->ti
.ti_tid
);
362 lwp_from_thread (ptid_t ptid
)
364 return BUILD_LWP (GET_LWP (ptid
), GET_PID (ptid
));
369 thread_db_init (struct target_ops
*target
)
371 target_beneath
= target
;
375 verbose_dlsym (void *handle
, const char *name
)
377 void *sym
= dlsym (handle
, name
);
379 warning (_("Symbol \"%s\" not found in libthread_db: %s"), name
, dlerror ());
384 thread_db_load (void)
389 handle
= dlopen (LIBTHREAD_DB_SO
, RTLD_NOW
);
392 fprintf_filtered (gdb_stderr
, "\n\ndlopen failed on '%s' - %s\n",
393 LIBTHREAD_DB_SO
, dlerror ());
394 fprintf_filtered (gdb_stderr
,
395 "GDB will not be able to debug pthreads.\n\n");
399 /* Initialize pointers to the dynamic library functions we will use.
400 Essential functions first. */
402 td_init_p
= verbose_dlsym (handle
, "td_init");
403 if (td_init_p
== NULL
)
406 td_ta_new_p
= verbose_dlsym (handle
, "td_ta_new");
407 if (td_ta_new_p
== NULL
)
410 td_ta_map_id2thr_p
= verbose_dlsym (handle
, "td_ta_map_id2thr");
411 if (td_ta_map_id2thr_p
== NULL
)
414 td_ta_map_lwp2thr_p
= verbose_dlsym (handle
, "td_ta_map_lwp2thr");
415 if (td_ta_map_lwp2thr_p
== NULL
)
418 td_ta_thr_iter_p
= verbose_dlsym (handle
, "td_ta_thr_iter");
419 if (td_ta_thr_iter_p
== NULL
)
422 td_thr_validate_p
= verbose_dlsym (handle
, "td_thr_validate");
423 if (td_thr_validate_p
== NULL
)
426 td_thr_get_info_p
= verbose_dlsym (handle
, "td_thr_get_info");
427 if (td_thr_get_info_p
== NULL
)
430 /* Initialize the library. */
434 warning (_("Cannot initialize libthread_db: %s"), thread_db_err_str (err
));
438 /* These are not essential. */
439 td_ta_event_addr_p
= dlsym (handle
, "td_ta_event_addr");
440 td_ta_set_event_p
= dlsym (handle
, "td_ta_set_event");
441 td_ta_event_getmsg_p
= dlsym (handle
, "td_ta_event_getmsg");
442 td_thr_event_enable_p
= dlsym (handle
, "td_thr_event_enable");
443 td_thr_tls_get_addr_p
= dlsym (handle
, "td_thr_tls_get_addr");
449 enable_thread_event (td_thragent_t
*thread_agent
, int event
, CORE_ADDR
*bp
)
454 /* Get the breakpoint address for thread EVENT. */
455 err
= td_ta_event_addr_p (thread_agent
, event
, ¬ify
);
459 /* Set up the breakpoint. */
460 gdb_assert (exec_bfd
);
461 (*bp
) = (gdbarch_convert_from_func_ptr_addr
463 /* Do proper sign extension for the target. */
464 (bfd_get_sign_extend_vma (exec_bfd
) > 0
465 ? (CORE_ADDR
) (intptr_t) notify
.u
.bptaddr
466 : (CORE_ADDR
) (uintptr_t) notify
.u
.bptaddr
),
468 create_thread_event_breakpoint ((*bp
));
474 enable_thread_event_reporting (void)
476 td_thr_events_t events
;
479 #ifdef HAVE_GNU_LIBC_VERSION_H
480 const char *libc_version
;
481 int libc_major
, libc_minor
;
484 /* We cannot use the thread event reporting facility if these
485 functions aren't available. */
486 if (td_ta_event_addr_p
== NULL
|| td_ta_set_event_p
== NULL
487 || td_ta_event_getmsg_p
== NULL
|| td_thr_event_enable_p
== NULL
)
490 /* Set the process wide mask saying which events we're interested in. */
491 td_event_emptyset (&events
);
492 td_event_addset (&events
, TD_CREATE
);
494 #ifdef HAVE_GNU_LIBC_VERSION_H
495 /* The event reporting facility is broken for TD_DEATH events in
496 glibc 2.1.3, so don't enable it if we have glibc but a lower
498 libc_version
= gnu_get_libc_version ();
499 if (sscanf (libc_version
, "%d.%d", &libc_major
, &libc_minor
) == 2
500 && (libc_major
> 2 || (libc_major
== 2 && libc_minor
> 1)))
502 td_event_addset (&events
, TD_DEATH
);
504 err
= td_ta_set_event_p (thread_agent
, &events
);
507 warning (_("Unable to set global thread event mask: %s"),
508 thread_db_err_str (err
));
512 /* Delete previous thread event breakpoints, if any. */
513 remove_thread_event_breakpoints ();
514 td_create_bp_addr
= 0;
515 td_death_bp_addr
= 0;
517 /* Set up the thread creation event. */
518 err
= enable_thread_event (thread_agent
, TD_CREATE
, &td_create_bp_addr
);
521 warning (_("Unable to get location for thread creation breakpoint: %s"),
522 thread_db_err_str (err
));
526 /* Set up the thread death event. */
527 err
= enable_thread_event (thread_agent
, TD_DEATH
, &td_death_bp_addr
);
530 warning (_("Unable to get location for thread death breakpoint: %s"),
531 thread_db_err_str (err
));
537 disable_thread_event_reporting (void)
539 td_thr_events_t events
;
541 /* Set the process wide mask saying we aren't interested in any
543 td_event_emptyset (&events
);
544 td_ta_set_event_p (thread_agent
, &events
);
546 /* Delete thread event breakpoints, if any. */
547 remove_thread_event_breakpoints ();
548 td_create_bp_addr
= 0;
549 td_death_bp_addr
= 0;
553 check_thread_signals (void)
555 #ifdef GET_THREAD_SIGNALS
561 GET_THREAD_SIGNALS (&mask
);
562 sigemptyset (&thread_stop_set
);
563 sigemptyset (&thread_print_set
);
565 for (i
= 1; i
< NSIG
; i
++)
567 if (sigismember (&mask
, i
))
569 if (signal_stop_update (target_signal_from_host (i
), 0))
570 sigaddset (&thread_stop_set
, i
);
571 if (signal_print_update (target_signal_from_host (i
), 0))
572 sigaddset (&thread_print_set
, i
);
580 /* Check whether thread_db is usable. This function is called when
581 an inferior is created (or otherwise acquired, e.g. attached to)
582 and when new shared libraries are loaded into a running process. */
585 check_for_thread_db (void)
588 static int already_loaded
;
590 /* Do nothing if we couldn't load libthread_db.so.1. */
591 if (td_ta_new_p
== NULL
)
594 /* First time through, report that libthread_db was successfuly
595 loaded. Can't print this in in thread_db_load as, at that stage,
596 the interpreter and it's console haven't started. */
601 const char *library
= NULL
;
602 if (dladdr ((*td_ta_new_p
), &info
) != 0)
603 library
= info
.dli_fname
;
608 /* Paranoid - don't let a NULL path slip through. */
609 library
= LIBTHREAD_DB_SO
;
612 printf_unfiltered (_("Using host libthread_db library \"%s\".\n"),
618 /* Nothing to do. The thread library was already detected and the
619 target vector was already activated. */
622 /* Don't attempt to use thread_db on targets which can not run
623 (executables not running yet, core files) for now. */
624 if (!target_has_execution
)
627 /* Don't attempt to use thread_db for remote targets. */
628 if (!target_can_run (¤t_target
))
631 /* Initialize the structure that identifies the child process. */
632 proc_handle
.pid
= GET_PID (inferior_ptid
);
634 /* Now attempt to open a connection to the thread library. */
635 err
= td_ta_new_p (&proc_handle
, &thread_agent
);
639 /* No thread library was detected. */
643 printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n"));
645 /* The thread library was detected. Activate the thread_db target. */
646 push_target (&thread_db_ops
);
649 enable_thread_event_reporting ();
650 thread_db_find_new_threads ();
654 warning (_("Cannot initialize thread debugging library: %s"),
655 thread_db_err_str (err
));
661 thread_db_new_objfile (struct objfile
*objfile
)
664 check_for_thread_db ();
667 /* Attach to a new thread. This function is called when we receive a
668 TD_CREATE event or when we iterate over all threads and find one
669 that wasn't already in our list. */
672 attach_thread (ptid_t ptid
, const td_thrhandle_t
*th_p
,
673 const td_thrinfo_t
*ti_p
, int verbose
)
675 struct thread_info
*tp
;
678 /* If we're being called after a TD_CREATE event, we may already
679 know about this thread. There are two ways this can happen. We
680 may have iterated over all threads between the thread creation
681 and the TD_CREATE event, for instance when the user has issued
682 the `info threads' command before the SIGTRAP for hitting the
683 thread creation breakpoint was reported. Alternatively, the
684 thread may have exited and a new one been created with the same
685 thread ID. In the first case we don't need to do anything; in
686 the second case we should discard information about the dead
687 thread and attach to the new one. */
688 if (in_thread_list (ptid
))
690 tp
= find_thread_pid (ptid
);
691 gdb_assert (tp
!= NULL
);
693 if (!tp
->private->dying
)
696 delete_thread (ptid
);
699 check_thread_signals ();
701 if (ti_p
->ti_state
== TD_THR_UNKNOWN
|| ti_p
->ti_state
== TD_THR_ZOMBIE
)
702 return; /* A zombie thread -- do not attach. */
704 /* Under GNU/Linux, we have to attach to each and every thread. */
705 if (lin_lwp_attach_lwp (BUILD_LWP (ti_p
->ti_lid
, GET_PID (ptid
)), 0) < 0)
708 /* Add the thread to GDB's thread list. */
709 tp
= add_thread (ptid
);
710 tp
->private = xmalloc (sizeof (struct private_thread_info
));
711 memset (tp
->private, 0, sizeof (struct private_thread_info
));
714 printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid
));
716 /* Enable thread event reporting for this thread. */
717 err
= td_thr_event_enable_p (th_p
, 1);
719 error (_("Cannot enable thread event reporting for %s: %s"),
720 target_pid_to_str (ptid
), thread_db_err_str (err
));
724 detach_thread (ptid_t ptid
, int verbose
)
726 struct thread_info
*thread_info
;
729 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid
));
731 /* Don't delete the thread now, because it still reports as active
732 until it has executed a few instructions after the event
733 breakpoint - if we deleted it now, "info threads" would cause us
734 to re-attach to it. Just mark it as having had a TD_DEATH
735 event. This means that we won't delete it from our thread list
736 until we notice that it's dead (via prune_threads), or until
737 something re-uses its thread ID. */
738 thread_info
= find_thread_pid (ptid
);
739 gdb_assert (thread_info
!= NULL
);
740 thread_info
->private->dying
= 1;
744 thread_db_detach (char *args
, int from_tty
)
746 disable_thread_event_reporting ();
748 /* There's no need to save & restore inferior_ptid here, since the
749 inferior is not supposed to survive this function call. */
750 inferior_ptid
= lwp_from_thread (inferior_ptid
);
752 target_beneath
->to_detach (args
, from_tty
);
754 /* Should this be done by detach_command? */
755 target_mourn_inferior ();
759 clear_lwpid_callback (struct thread_info
*thread
, void *dummy
)
761 /* If we know that our thread implementation is 1-to-1, we could save
762 a certain amount of information; it's not clear how much, so we
763 are always conservative. */
765 thread
->private->th_valid
= 0;
766 thread
->private->ti_valid
= 0;
772 thread_db_resume (ptid_t ptid
, int step
, enum target_signal signo
)
774 struct cleanup
*old_chain
= save_inferior_ptid ();
776 if (GET_PID (ptid
) == -1)
777 inferior_ptid
= lwp_from_thread (inferior_ptid
);
778 else if (is_thread (ptid
))
779 ptid
= lwp_from_thread (ptid
);
781 /* Clear cached data which may not be valid after the resume. */
782 iterate_over_threads (clear_lwpid_callback
, NULL
);
784 target_beneath
->to_resume (ptid
, step
, signo
);
786 do_cleanups (old_chain
);
789 /* Check if PID is currently stopped at the location of a thread event
790 breakpoint location. If it is, read the event message and act upon
794 check_event (ptid_t ptid
)
802 /* Bail out early if we're not at a thread event breakpoint. */
803 stop_pc
= read_pc_pid (ptid
) - gdbarch_decr_pc_after_break (current_gdbarch
);
804 if (stop_pc
!= td_create_bp_addr
&& stop_pc
!= td_death_bp_addr
)
807 /* If we are at a create breakpoint, we do not know what new lwp
808 was created and cannot specifically locate the event message for it.
809 We have to call td_ta_event_getmsg() to get
810 the latest message. Since we have no way of correlating whether
811 the event message we get back corresponds to our breakpoint, we must
812 loop and read all event messages, processing them appropriately.
813 This guarantees we will process the correct message before continuing
816 Currently, death events are not enabled. If they are enabled,
817 the death event can use the td_thr_event_getmsg() interface to
818 get the message specifically for that lwp and avoid looping
825 err
= td_ta_event_getmsg_p (thread_agent
, &msg
);
831 error (_("Cannot get thread event message: %s"),
832 thread_db_err_str (err
));
835 err
= td_thr_get_info_p (msg
.th_p
, &ti
);
837 error (_("Cannot get thread info: %s"), thread_db_err_str (err
));
839 ptid
= ptid_build (GET_PID (ptid
), ti
.ti_lid
, ti
.ti_tid
);
844 /* Call attach_thread whether or not we already know about a
845 thread with this thread ID. */
846 attach_thread (ptid
, msg
.th_p
, &ti
, 1);
852 if (!in_thread_list (ptid
))
853 error (_("Spurious thread death event."));
855 detach_thread (ptid
, 1);
860 error (_("Spurious thread event."));
867 thread_db_wait (ptid_t ptid
, struct target_waitstatus
*ourstatus
)
869 extern ptid_t trap_ptid
;
871 if (GET_PID (ptid
) != -1 && is_thread (ptid
))
872 ptid
= lwp_from_thread (ptid
);
874 ptid
= target_beneath
->to_wait (ptid
, ourstatus
);
876 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
877 || ourstatus
->kind
== TARGET_WAITKIND_SIGNALLED
)
878 return pid_to_ptid (-1);
880 if (ourstatus
->kind
== TARGET_WAITKIND_EXECD
)
882 remove_thread_event_breakpoints ();
883 unpush_target (&thread_db_ops
);
886 return pid_to_ptid (GET_PID (ptid
));
889 /* If we do not know about the main thread yet, this would be a good time to
891 if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
&& !have_threads ())
892 thread_db_find_new_threads ();
894 if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
895 && ourstatus
->value
.sig
== TARGET_SIGNAL_TRAP
)
896 /* Check for a thread event. */
901 /* Change ptids back into the higher level PID + TID format. If
902 the thread is dead and no longer on the thread list, we will
903 get back a dead ptid. This can occur if the thread death
904 event gets postponed by other simultaneous events. In such a
905 case, we want to just ignore the event and continue on. */
907 if (!ptid_equal (trap_ptid
, null_ptid
))
908 trap_ptid
= thread_from_lwp (trap_ptid
);
910 ptid
= thread_from_lwp (ptid
);
911 if (GET_PID (ptid
) == -1)
912 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
919 thread_db_kill (void)
921 /* There's no need to save & restore inferior_ptid here, since the
922 inferior isn't supposed to survive this function call. */
923 inferior_ptid
= lwp_from_thread (inferior_ptid
);
924 target_beneath
->to_kill ();
928 thread_db_mourn_inferior (void)
930 /* Forget about the child's process ID. We shouldn't need it
934 target_beneath
->to_mourn_inferior ();
936 /* Delete the old thread event breakpoints. Do this after mourning
937 the inferior, so that we don't try to uninsert them. */
938 remove_thread_event_breakpoints ();
940 /* Detach thread_db target ops. */
941 unpush_target (&thread_db_ops
);
946 find_new_threads_callback (const td_thrhandle_t
*th_p
, void *data
)
952 err
= td_thr_get_info_p (th_p
, &ti
);
954 error (_("find_new_threads_callback: cannot get thread info: %s"),
955 thread_db_err_str (err
));
957 if (ti
.ti_state
== TD_THR_UNKNOWN
|| ti
.ti_state
== TD_THR_ZOMBIE
)
958 return 0; /* A zombie -- ignore. */
960 ptid
= ptid_build (GET_PID (inferior_ptid
), ti
.ti_lid
, ti
.ti_tid
);
964 /* A thread ID of zero means that this is the main thread, but
965 glibc has not yet initialized thread-local storage and the
966 pthread library. We do not know what the thread's TID will
967 be yet. Just enable event reporting and otherwise ignore
970 err
= td_thr_event_enable_p (th_p
, 1);
972 error (_("Cannot enable thread event reporting for %s: %s"),
973 target_pid_to_str (ptid
), thread_db_err_str (err
));
978 if (!in_thread_list (ptid
))
979 attach_thread (ptid
, th_p
, &ti
, 1);
985 thread_db_find_new_threads (void)
989 /* Iterate over all user-space threads to discover new threads. */
990 err
= td_ta_thr_iter_p (thread_agent
, find_new_threads_callback
, NULL
,
991 TD_THR_ANY_STATE
, TD_THR_LOWEST_PRIORITY
,
992 TD_SIGNO_MASK
, TD_THR_ANY_USER_FLAGS
);
994 error (_("Cannot find new threads: %s"), thread_db_err_str (err
));
998 thread_db_pid_to_str (ptid_t ptid
)
1000 if (is_thread (ptid
))
1002 static char buf
[64];
1003 struct thread_info
*thread_info
;
1005 thread_info
= find_thread_pid (ptid
);
1006 if (thread_info
== NULL
)
1007 snprintf (buf
, sizeof (buf
), "Thread 0x%lx (LWP %ld) (Missing)",
1008 GET_THREAD (ptid
), GET_LWP (ptid
));
1010 snprintf (buf
, sizeof (buf
), "Thread 0x%lx (LWP %ld)",
1011 GET_THREAD (ptid
), GET_LWP (ptid
));
1016 if (target_beneath
->to_pid_to_str (ptid
))
1017 return target_beneath
->to_pid_to_str (ptid
);
1019 return normal_pid_to_str (ptid
);
1022 /* Return a string describing the state of the thread specified by
1026 thread_db_extra_thread_info (struct thread_info
*info
)
1028 if (info
->private->dying
)
1034 /* Return 1 if this thread has the same LWP as the passed PTID. */
1037 same_ptid_callback (struct thread_info
*thread
, void *arg
)
1039 ptid_t
*ptid_p
= arg
;
1041 return GET_LWP (thread
->ptid
) == GET_LWP (*ptid_p
);
1044 /* Get the address of the thread local variable in load module LM which
1045 is stored at OFFSET within the thread local storage for thread PTID. */
1048 thread_db_get_thread_local_address (ptid_t ptid
,
1052 /* If we have not discovered any threads yet, check now. */
1053 if (!is_thread (ptid
) && !have_threads ())
1054 thread_db_find_new_threads ();
1056 /* Try to find a matching thread if we still have the LWP ID instead
1057 of the thread ID. */
1058 if (!is_thread (ptid
))
1060 struct thread_info
*thread
;
1062 thread
= iterate_over_threads (same_ptid_callback
, &ptid
);
1064 ptid
= thread
->ptid
;
1067 if (is_thread (ptid
))
1071 struct thread_info
*thread_info
;
1073 /* glibc doesn't provide the needed interface. */
1074 if (!td_thr_tls_get_addr_p
)
1075 throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR
,
1076 _("No TLS library support"));
1078 /* Caller should have verified that lm != 0. */
1079 gdb_assert (lm
!= 0);
1081 /* Get info about the thread. */
1082 thread_info
= find_thread_pid (ptid
);
1083 gdb_assert (thread_info
);
1084 thread_db_map_id2thr (thread_info
, 1);
1086 /* Finally, get the address of the variable. */
1087 err
= td_thr_tls_get_addr_p (&thread_info
->private->th
,
1088 (void *)(size_t) lm
,
1091 #ifdef THREAD_DB_HAS_TD_NOTALLOC
1092 /* The memory hasn't been allocated, yet. */
1093 if (err
== TD_NOTALLOC
)
1094 /* Now, if libthread_db provided the initialization image's
1095 address, we *could* try to build a non-lvalue value from
1096 the initialization image. */
1097 throw_error (TLS_NOT_ALLOCATED_YET_ERROR
,
1098 _("TLS not allocated yet"));
1101 /* Something else went wrong. */
1103 throw_error (TLS_GENERIC_ERROR
,
1104 (("%s")), thread_db_err_str (err
));
1106 /* Cast assuming host == target. Joy. */
1107 /* Do proper sign extension for the target. */
1108 gdb_assert (exec_bfd
);
1109 return (bfd_get_sign_extend_vma (exec_bfd
) > 0
1110 ? (CORE_ADDR
) (intptr_t) address
1111 : (CORE_ADDR
) (uintptr_t) address
);
1114 if (target_beneath
->to_get_thread_local_address
)
1115 return target_beneath
->to_get_thread_local_address (ptid
, lm
, offset
);
1117 throw_error (TLS_GENERIC_ERROR
,
1118 _("TLS not supported on this target"));
1122 init_thread_db_ops (void)
1124 thread_db_ops
.to_shortname
= "multi-thread";
1125 thread_db_ops
.to_longname
= "multi-threaded child process.";
1126 thread_db_ops
.to_doc
= "Threads and pthreads support.";
1127 thread_db_ops
.to_detach
= thread_db_detach
;
1128 thread_db_ops
.to_resume
= thread_db_resume
;
1129 thread_db_ops
.to_wait
= thread_db_wait
;
1130 thread_db_ops
.to_kill
= thread_db_kill
;
1131 thread_db_ops
.to_mourn_inferior
= thread_db_mourn_inferior
;
1132 thread_db_ops
.to_find_new_threads
= thread_db_find_new_threads
;
1133 thread_db_ops
.to_pid_to_str
= thread_db_pid_to_str
;
1134 thread_db_ops
.to_stratum
= thread_stratum
;
1135 thread_db_ops
.to_has_thread_control
= tc_schedlock
;
1136 thread_db_ops
.to_get_thread_local_address
1137 = thread_db_get_thread_local_address
;
1138 thread_db_ops
.to_extra_thread_info
= thread_db_extra_thread_info
;
1139 thread_db_ops
.to_magic
= OPS_MAGIC
;
1143 _initialize_thread_db (void)
1145 /* Only initialize the module if we can load libthread_db. */
1146 if (thread_db_load ())
1148 init_thread_db_ops ();
1149 add_target (&thread_db_ops
);
1151 /* Add ourselves to objfile event chain. */
1152 observer_attach_new_objfile (thread_db_new_objfile
);