1 /* libthread_db assisted debugging support, generic parts.
2 Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
23 #include "gdb_assert.h"
25 #include "gdb_proc_service.h"
26 #include "gdb_thread_db.h"
29 #include "gdbthread.h"
35 #include "solib-svr4.h"
37 #ifndef LIBTHREAD_DB_SO
38 #define LIBTHREAD_DB_SO "libthread_db.so.1"
41 /* If we're running on GNU/Linux, we must explicitly attach to any new
44 /* FIXME: There is certainly some room for improvements:
46 - Bypass libthread_db when fetching or storing registers for
47 threads bound to a LWP. */
49 /* This module's target vector. */
50 static struct target_ops thread_db_ops
;
52 /* The target vector that we call for things this module can't handle. */
53 static struct target_ops
*target_beneath
;
55 /* Pointer to the next function on the objfile event chain. */
56 static void (*target_new_objfile_chain
) (struct objfile
*objfile
);
58 /* Non-zero if we're using this module's target vector. */
59 static int using_thread_db
;
61 /* Non-zero if we have to keep this module's target vector active
63 static int keep_thread_db
;
65 /* Non-zero if we have determined the signals used by the threads
67 static int thread_signals
;
68 static sigset_t thread_stop_set
;
69 static sigset_t thread_print_set
;
71 /* Structure that identifies the child process for the
72 <proc_service.h> interface. */
73 static struct ps_prochandle proc_handle
;
75 /* Connection to the libthread_db library. */
76 static td_thragent_t
*thread_agent
;
78 /* Pointers to the libthread_db functions. */
80 static td_err_e (*td_init_p
) (void);
82 static td_err_e (*td_ta_new_p
) (struct ps_prochandle
*ps
, td_thragent_t
**ta
);
83 static td_err_e (*td_ta_map_id2thr_p
) (const td_thragent_t
*ta
, thread_t pt
,
84 td_thrhandle_t
*__th
);
85 static td_err_e (*td_ta_map_lwp2thr_p
) (const td_thragent_t
*ta
, lwpid_t lwpid
,
87 static td_err_e (*td_ta_thr_iter_p
) (const td_thragent_t
*ta
,
88 td_thr_iter_f
*callback
,
89 void *cbdata_p
, td_thr_state_e state
,
90 int ti_pri
, sigset_t
*ti_sigmask_p
,
91 unsigned int ti_user_flags
);
92 static td_err_e (*td_ta_event_addr_p
) (const td_thragent_t
*ta
,
93 td_event_e event
, td_notify_t
*ptr
);
94 static td_err_e (*td_ta_set_event_p
) (const td_thragent_t
*ta
,
95 td_thr_events_t
*event
);
96 static td_err_e (*td_ta_event_getmsg_p
) (const td_thragent_t
*ta
,
99 static td_err_e (*td_thr_validate_p
) (const td_thrhandle_t
*th
);
100 static td_err_e (*td_thr_get_info_p
) (const td_thrhandle_t
*th
,
101 td_thrinfo_t
*infop
);
102 static td_err_e (*td_thr_getfpregs_p
) (const td_thrhandle_t
*th
,
103 gdb_prfpregset_t
*regset
);
104 static td_err_e (*td_thr_getgregs_p
) (const td_thrhandle_t
*th
,
106 static td_err_e (*td_thr_setfpregs_p
) (const td_thrhandle_t
*th
,
107 const gdb_prfpregset_t
*fpregs
);
108 static td_err_e (*td_thr_setgregs_p
) (const td_thrhandle_t
*th
,
110 static td_err_e (*td_thr_event_enable_p
) (const td_thrhandle_t
*th
, int event
);
112 static td_err_e (*td_thr_tls_get_addr_p
) (const td_thrhandle_t
*th
,
117 /* Location of the thread creation event breakpoint. The code at this
118 location in the child process will be called by the pthread library
119 whenever a new thread is created. By setting a special breakpoint
120 at this location, GDB can detect when a new thread is created. We
121 obtain this location via the td_ta_event_addr call. */
122 static CORE_ADDR td_create_bp_addr
;
124 /* Location of the thread death event breakpoint. */
125 static CORE_ADDR td_death_bp_addr
;
127 /* Prototypes for local functions. */
128 static void thread_db_find_new_threads (void);
131 /* Building process ids. */
133 #define GET_PID(ptid) ptid_get_pid (ptid)
134 #define GET_LWP(ptid) ptid_get_lwp (ptid)
135 #define GET_THREAD(ptid) ptid_get_tid (ptid)
137 #define is_lwp(ptid) (GET_LWP (ptid) != 0)
138 #define is_thread(ptid) (GET_THREAD (ptid) != 0)
140 #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
141 #define BUILD_THREAD(tid, pid) ptid_build (pid, 0, tid)
144 struct private_thread_info
146 /* Cached LWP id. Must come first, see lin-lwp.c. */
152 thread_db_err_str (td_err_e err
)
159 return "generic 'call succeeded'";
161 return "generic error";
163 return "no thread to satisfy query";
165 return "no sync handle to satisfy query";
167 return "no LWP to satisfy query";
169 return "invalid process handle";
171 return "invalid thread handle";
173 return "invalid synchronization handle";
175 return "invalid thread agent";
177 return "invalid key";
179 return "no event message for getmsg";
181 return "FPU register set not available";
183 return "application not linked with libthread";
185 return "requested event is not supported";
187 return "capability not available";
189 return "debugger service failed";
191 return "operation not applicable to";
193 return "no thread-specific data for this thread";
195 return "malloc failed";
197 return "only part of register set was written/read";
199 return "X register set not available for this thread";
201 snprintf (buf
, sizeof (buf
), "unknown thread_db error '%d'", err
);
207 thread_db_state_str (td_thr_state_e state
)
214 return "stopped by debugger";
223 case TD_THR_STOPPED_ASLEEP
:
224 return "stopped by debugger AND blocked";
226 snprintf (buf
, sizeof (buf
), "unknown thread_db state %d", state
);
232 /* Convert between user-level thread ids and LWP ids. */
235 thread_from_lwp (ptid_t ptid
)
241 if (GET_LWP (ptid
) == 0)
242 ptid
= BUILD_LWP (GET_PID (ptid
), GET_PID (ptid
));
244 gdb_assert (is_lwp (ptid
));
246 err
= td_ta_map_lwp2thr_p (thread_agent
, GET_LWP (ptid
), &th
);
248 error ("Cannot find user-level thread for LWP %ld: %s",
249 GET_LWP (ptid
), thread_db_err_str (err
));
251 err
= td_thr_get_info_p (&th
, &ti
);
253 error ("Cannot get thread info: %s", thread_db_err_str (err
));
255 return BUILD_THREAD (ti
.ti_tid
, GET_PID (ptid
));
259 lwp_from_thread (ptid_t ptid
)
265 if (!is_thread (ptid
))
268 err
= td_ta_map_id2thr_p (thread_agent
, GET_THREAD (ptid
), &th
);
270 error ("Cannot find thread %ld: %s",
271 (long) GET_THREAD (ptid
), thread_db_err_str (err
));
273 err
= td_thr_get_info_p (&th
, &ti
);
275 error ("Cannot get thread info: %s", thread_db_err_str (err
));
277 return BUILD_LWP (ti
.ti_lid
, GET_PID (ptid
));
282 thread_db_init (struct target_ops
*target
)
284 target_beneath
= target
;
288 thread_db_load (void)
293 handle
= dlopen (LIBTHREAD_DB_SO
, RTLD_NOW
);
297 /* Initialize pointers to the dynamic library functions we will use.
298 Essential functions first. */
300 td_init_p
= dlsym (handle
, "td_init");
301 if (td_init_p
== NULL
)
304 td_ta_new_p
= dlsym (handle
, "td_ta_new");
305 if (td_ta_new_p
== NULL
)
308 td_ta_map_id2thr_p
= dlsym (handle
, "td_ta_map_id2thr");
309 if (td_ta_map_id2thr_p
== NULL
)
312 td_ta_map_lwp2thr_p
= dlsym (handle
, "td_ta_map_lwp2thr");
313 if (td_ta_map_lwp2thr_p
== NULL
)
316 td_ta_thr_iter_p
= dlsym (handle
, "td_ta_thr_iter");
317 if (td_ta_thr_iter_p
== NULL
)
320 td_thr_validate_p
= dlsym (handle
, "td_thr_validate");
321 if (td_thr_validate_p
== NULL
)
324 td_thr_get_info_p
= dlsym (handle
, "td_thr_get_info");
325 if (td_thr_get_info_p
== NULL
)
328 td_thr_getfpregs_p
= dlsym (handle
, "td_thr_getfpregs");
329 if (td_thr_getfpregs_p
== NULL
)
332 td_thr_getgregs_p
= dlsym (handle
, "td_thr_getgregs");
333 if (td_thr_getgregs_p
== NULL
)
336 td_thr_setfpregs_p
= dlsym (handle
, "td_thr_setfpregs");
337 if (td_thr_setfpregs_p
== NULL
)
340 td_thr_setgregs_p
= dlsym (handle
, "td_thr_setgregs");
341 if (td_thr_setgregs_p
== NULL
)
344 /* Initialize the library. */
348 warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err
));
352 /* These are not essential. */
353 td_ta_event_addr_p
= dlsym (handle
, "td_ta_event_addr");
354 td_ta_set_event_p
= dlsym (handle
, "td_ta_set_event");
355 td_ta_event_getmsg_p
= dlsym (handle
, "td_ta_event_getmsg");
356 td_thr_event_enable_p
= dlsym (handle
, "td_thr_event_enable");
357 td_thr_tls_get_addr_p
= dlsym (handle
, "td_thr_tls_get_addr");
363 enable_thread_event_reporting (void)
365 td_thr_events_t events
;
369 /* We cannot use the thread event reporting facility if these
370 functions aren't available. */
371 if (td_ta_event_addr_p
== NULL
|| td_ta_set_event_p
== NULL
372 || td_ta_event_getmsg_p
== NULL
|| td_thr_event_enable_p
== NULL
)
375 /* Set the process wide mask saying which events we're interested in. */
376 td_event_emptyset (&events
);
377 td_event_addset (&events
, TD_CREATE
);
379 /* FIXME: kettenis/2000-04-23: The event reporting facility is
380 broken for TD_DEATH events in glibc 2.1.3, so don't enable it for
382 td_event_addset (&events
, TD_DEATH
);
385 err
= td_ta_set_event_p (thread_agent
, &events
);
388 warning ("Unable to set global thread event mask: %s",
389 thread_db_err_str (err
));
393 /* Delete previous thread event breakpoints, if any. */
394 remove_thread_event_breakpoints ();
396 /* Get address for thread creation breakpoint. */
397 err
= td_ta_event_addr_p (thread_agent
, TD_CREATE
, ¬ify
);
400 warning ("Unable to get location for thread creation breakpoint: %s",
401 thread_db_err_str (err
));
405 /* Set up the breakpoint. */
406 td_create_bp_addr
= (CORE_ADDR
) notify
.u
.bptaddr
;
407 create_thread_event_breakpoint (td_create_bp_addr
);
409 /* Get address for thread death breakpoint. */
410 err
= td_ta_event_addr_p (thread_agent
, TD_DEATH
, ¬ify
);
413 warning ("Unable to get location for thread death breakpoint: %s",
414 thread_db_err_str (err
));
418 /* Set up the breakpoint. */
419 td_death_bp_addr
= (CORE_ADDR
) notify
.u
.bptaddr
;
420 create_thread_event_breakpoint (td_death_bp_addr
);
424 disable_thread_event_reporting (void)
426 td_thr_events_t events
;
428 /* Set the process wide mask saying we aren't interested in any
430 td_event_emptyset (&events
);
431 td_ta_set_event_p (thread_agent
, &events
);
433 /* Delete thread event breakpoints, if any. */
434 remove_thread_event_breakpoints ();
435 td_create_bp_addr
= 0;
436 td_death_bp_addr
= 0;
440 check_thread_signals (void)
442 #ifdef GET_THREAD_SIGNALS
448 GET_THREAD_SIGNALS (&mask
);
449 sigemptyset (&thread_stop_set
);
450 sigemptyset (&thread_print_set
);
452 for (i
= 1; i
< NSIG
; i
++)
454 if (sigismember (&mask
, i
))
456 if (signal_stop_update (target_signal_from_host (i
), 0))
457 sigaddset (&thread_stop_set
, i
);
458 if (signal_print_update (target_signal_from_host (i
), 0))
459 sigaddset (&thread_print_set
, i
);
468 disable_thread_signals (void)
470 #ifdef GET_THREAD_SIGNALS
475 for (i
= 1; i
< NSIG
; i
++)
477 if (sigismember (&thread_stop_set
, i
))
478 signal_stop_update (target_signal_from_host (i
), 1);
479 if (sigismember (&thread_print_set
, i
))
480 signal_print_update (target_signal_from_host (i
), 1);
489 thread_db_new_objfile (struct objfile
*objfile
)
493 /* Don't attempt to use thread_db on targets which can not run
495 if (objfile
== NULL
|| !target_has_execution
)
497 /* All symbols have been discarded. If the thread_db target is
498 active, deactivate it now. */
501 gdb_assert (proc_handle
.pid
== 0);
502 unpush_target (&thread_db_ops
);
512 /* Nothing to do. The thread library was already detected and the
513 target vector was already activated. */
516 /* Initialize the structure that identifies the child process. Note
517 that at this point there is no guarantee that we actually have a
519 proc_handle
.pid
= GET_PID (inferior_ptid
);
521 /* Now attempt to open a connection to the thread library. */
522 err
= td_ta_new_p (&proc_handle
, &thread_agent
);
526 /* No thread library was detected. */
530 /* The thread library was detected. Activate the thread_db target. */
531 push_target (&thread_db_ops
);
534 /* If the thread library was detected in the main symbol file
535 itself, we assume that the program was statically linked
536 against the thread library and well have to keep this
537 module's target vector activated until forever... Well, at
538 least until all symbols have been discarded anyway (see
540 if (objfile
== symfile_objfile
)
542 gdb_assert (proc_handle
.pid
== 0);
546 /* We can only poke around if there actually is a child process.
547 If there is no child process alive, postpone the steps below
548 until one has been created. */
549 if (proc_handle
.pid
!= 0)
551 enable_thread_event_reporting ();
552 thread_db_find_new_threads ();
557 warning ("Cannot initialize thread debugging library: %s",
558 thread_db_err_str (err
));
563 if (target_new_objfile_chain
)
564 target_new_objfile_chain (objfile
);
568 attach_thread (ptid_t ptid
, const td_thrhandle_t
*th_p
,
569 const td_thrinfo_t
*ti_p
, int verbose
)
571 struct thread_info
*tp
;
574 check_thread_signals ();
577 printf_unfiltered ("[New %s]\n", target_pid_to_str (ptid
));
579 /* Add the thread to GDB's thread list. */
580 tp
= add_thread (ptid
);
581 tp
->private = xmalloc (sizeof (struct private_thread_info
));
582 tp
->private->lwpid
= ti_p
->ti_lid
;
584 if (ti_p
->ti_state
== TD_THR_UNKNOWN
|| ti_p
->ti_state
== TD_THR_ZOMBIE
)
585 return; /* A zombie thread -- do not attach. */
587 /* Under GNU/Linux, we have to attach to each and every thread. */
589 ATTACH_LWP (BUILD_LWP (ti_p
->ti_lid
, GET_PID (ptid
)), 0);
592 /* Enable thread event reporting for this thread. */
593 err
= td_thr_event_enable_p (th_p
, 1);
595 error ("Cannot enable thread event reporting for %s: %s",
596 target_pid_to_str (ptid
), thread_db_err_str (err
));
600 thread_db_attach (char *args
, int from_tty
)
602 target_beneath
->to_attach (args
, from_tty
);
604 /* Destroy thread info; it's no longer valid. */
607 /* The child process is now the actual multi-threaded
608 program. Snatch its process ID... */
609 proc_handle
.pid
= GET_PID (inferior_ptid
);
611 /* ...and perform the remaining initialization steps. */
612 enable_thread_event_reporting ();
613 thread_db_find_new_threads();
617 detach_thread (ptid_t ptid
, int verbose
)
620 printf_unfiltered ("[%s exited]\n", target_pid_to_str (ptid
));
624 thread_db_detach (char *args
, int from_tty
)
626 disable_thread_event_reporting ();
628 /* There's no need to save & restore inferior_ptid here, since the
629 inferior is supposed to be survive this function call. */
630 inferior_ptid
= lwp_from_thread (inferior_ptid
);
632 /* Forget about the child's process ID. We shouldn't need it
636 target_beneath
->to_detach (args
, from_tty
);
640 thread_db_resume (ptid_t ptid
, int step
, enum target_signal signo
)
642 struct cleanup
*old_chain
= save_inferior_ptid ();
644 if (GET_PID (ptid
) == -1)
645 inferior_ptid
= lwp_from_thread (inferior_ptid
);
646 else if (is_thread (ptid
))
647 ptid
= lwp_from_thread (ptid
);
649 target_beneath
->to_resume (ptid
, step
, signo
);
651 do_cleanups (old_chain
);
654 /* Check if PID is currently stopped at the location of a thread event
655 breakpoint location. If it is, read the event message and act upon
659 check_event (ptid_t ptid
)
666 /* Bail out early if we're not at a thread event breakpoint. */
667 stop_pc
= read_pc_pid (ptid
) - DECR_PC_AFTER_BREAK
;
668 if (stop_pc
!= td_create_bp_addr
&& stop_pc
!= td_death_bp_addr
)
671 err
= td_ta_event_getmsg_p (thread_agent
, &msg
);
677 error ("Cannot get thread event message: %s", thread_db_err_str (err
));
680 err
= td_thr_get_info_p (msg
.th_p
, &ti
);
682 error ("Cannot get thread info: %s", thread_db_err_str (err
));
684 ptid
= BUILD_THREAD (ti
.ti_tid
, GET_PID (ptid
));
690 /* FIXME: kettenis/2000-08-26: Since we use td_ta_event_getmsg,
691 there is no guarantee that the breakpoint will match the
692 event. Should we use td_thr_event_getmsg instead? */
694 if (stop_pc
!= td_create_bp_addr
)
695 error ("Thread creation event doesn't match breakpoint.");
698 /* We may already know about this thread, for instance when the
699 user has issued the `info threads' command before the SIGTRAP
700 for hitting the thread creation breakpoint was reported. */
701 if (!in_thread_list (ptid
))
702 attach_thread (ptid
, msg
.th_p
, &ti
, 1);
707 /* FIXME: See TD_CREATE. */
709 if (stop_pc
!= td_death_bp_addr
)
710 error ("Thread death event doesn't match breakpoint.");
713 if (!in_thread_list (ptid
))
714 error ("Spurious thread death event.");
716 detach_thread (ptid
, 1);
720 error ("Spurious thread event.");
725 thread_db_wait (ptid_t ptid
, struct target_waitstatus
*ourstatus
)
727 extern ptid_t trap_ptid
;
729 if (GET_PID (ptid
) != -1 && is_thread (ptid
))
730 ptid
= lwp_from_thread (ptid
);
732 ptid
= target_beneath
->to_wait (ptid
, ourstatus
);
734 if (proc_handle
.pid
== 0)
735 /* The current child process isn't the actual multi-threaded
736 program yet, so don't try to do any special thread-specific
737 post-processing and bail out early. */
740 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
)
741 return pid_to_ptid (-1);
743 if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
744 && ourstatus
->value
.sig
== TARGET_SIGNAL_TRAP
)
745 /* Check for a thread event. */
748 if (!ptid_equal (trap_ptid
, null_ptid
))
749 trap_ptid
= thread_from_lwp (trap_ptid
);
751 return thread_from_lwp (ptid
);
755 thread_db_xfer_memory (CORE_ADDR memaddr
, char *myaddr
, int len
, int write
,
756 struct mem_attrib
*attrib
,
757 struct target_ops
*target
)
759 struct cleanup
*old_chain
= save_inferior_ptid ();
762 if (is_thread (inferior_ptid
))
764 /* FIXME: This seems to be necessary to make sure breakpoints
766 if (!target_thread_alive (inferior_ptid
))
767 inferior_ptid
= pid_to_ptid (GET_PID (inferior_ptid
));
769 inferior_ptid
= lwp_from_thread (inferior_ptid
);
772 xfer
= target_beneath
->to_xfer_memory (memaddr
, myaddr
, len
, write
, attrib
, target
);
774 do_cleanups (old_chain
);
779 thread_db_fetch_registers (int regno
)
783 gdb_prfpregset_t fpregset
;
786 if (!is_thread (inferior_ptid
))
788 /* Pass the request to the target beneath us. */
789 target_beneath
->to_fetch_registers (regno
);
793 err
= td_ta_map_id2thr_p (thread_agent
, GET_THREAD (inferior_ptid
), &th
);
795 error ("Cannot find thread %ld: %s",
796 (long) GET_THREAD (inferior_ptid
), thread_db_err_str (err
));
798 err
= td_thr_getgregs_p (&th
, gregset
);
800 error ("Cannot fetch general-purpose registers for thread %ld: %s",
801 (long) GET_THREAD (inferior_ptid
), thread_db_err_str (err
));
803 err
= td_thr_getfpregs_p (&th
, &fpregset
);
805 error ("Cannot get floating-point registers for thread %ld: %s",
806 (long) GET_THREAD (inferior_ptid
), thread_db_err_str (err
));
808 /* Note that we must call supply_gregset after calling the thread_db
809 routines because the thread_db routines call ps_lgetgregs and
810 friends which clobber GDB's register cache. */
811 supply_gregset ((gdb_gregset_t
*) gregset
);
812 supply_fpregset (&fpregset
);
816 thread_db_store_registers (int regno
)
820 gdb_prfpregset_t fpregset
;
823 if (!is_thread (inferior_ptid
))
825 /* Pass the request to the target beneath us. */
826 target_beneath
->to_store_registers (regno
);
830 err
= td_ta_map_id2thr_p (thread_agent
, GET_THREAD (inferior_ptid
), &th
);
832 error ("Cannot find thread %ld: %s",
833 (long) GET_THREAD (inferior_ptid
), thread_db_err_str (err
));
837 char raw
[MAX_REGISTER_RAW_SIZE
];
839 deprecated_read_register_gen (regno
, raw
);
840 thread_db_fetch_registers (-1);
841 supply_register (regno
, raw
);
844 fill_gregset ((gdb_gregset_t
*) gregset
, -1);
845 fill_fpregset (&fpregset
, -1);
847 err
= td_thr_setgregs_p (&th
, gregset
);
849 error ("Cannot store general-purpose registers for thread %ld: %s",
850 (long) GET_THREAD (inferior_ptid
), thread_db_err_str (err
));
851 err
= td_thr_setfpregs_p (&th
, &fpregset
);
853 error ("Cannot store floating-point registers for thread %ld: %s",
854 (long) GET_THREAD (inferior_ptid
), thread_db_err_str (err
));
858 thread_db_kill (void)
860 /* There's no need to save & restore inferior_ptid here, since the
861 inferior isn't supposed to survive this function call. */
862 inferior_ptid
= lwp_from_thread (inferior_ptid
);
863 target_beneath
->to_kill ();
867 thread_db_create_inferior (char *exec_file
, char *allargs
, char **env
)
871 unpush_target (&thread_db_ops
);
875 target_beneath
->to_create_inferior (exec_file
, allargs
, env
);
879 thread_db_post_startup_inferior (ptid_t ptid
)
881 if (proc_handle
.pid
== 0)
883 /* The child process is now the actual multi-threaded
884 program. Snatch its process ID... */
885 proc_handle
.pid
= GET_PID (ptid
);
887 /* ...and perform the remaining initialization steps. */
888 enable_thread_event_reporting ();
889 thread_db_find_new_threads ();
894 thread_db_mourn_inferior (void)
896 remove_thread_event_breakpoints ();
898 /* Forget about the child's process ID. We shouldn't need it
902 target_beneath
->to_mourn_inferior ();
906 thread_db_thread_alive (ptid_t ptid
)
912 if (is_thread (ptid
))
914 err
= td_ta_map_id2thr_p (thread_agent
, GET_THREAD (ptid
), &th
);
918 err
= td_thr_validate_p (&th
);
922 err
= td_thr_get_info_p (&th
, &ti
);
926 if (ti
.ti_state
== TD_THR_UNKNOWN
|| ti
.ti_state
== TD_THR_ZOMBIE
)
927 return 0; /* A zombie thread. */
932 if (target_beneath
->to_thread_alive
)
933 return target_beneath
->to_thread_alive (ptid
);
939 find_new_threads_callback (const td_thrhandle_t
*th_p
, void *data
)
945 err
= td_thr_get_info_p (th_p
, &ti
);
947 error ("Cannot get thread info: %s", thread_db_err_str (err
));
949 if (ti
.ti_state
== TD_THR_UNKNOWN
|| ti
.ti_state
== TD_THR_ZOMBIE
)
950 return 0; /* A zombie -- ignore. */
952 ptid
= BUILD_THREAD (ti
.ti_tid
, GET_PID (inferior_ptid
));
954 if (!in_thread_list (ptid
))
955 attach_thread (ptid
, th_p
, &ti
, 1);
961 thread_db_find_new_threads (void)
965 /* Iterate over all user-space threads to discover new threads. */
966 err
= td_ta_thr_iter_p (thread_agent
, find_new_threads_callback
, NULL
,
967 TD_THR_ANY_STATE
, TD_THR_LOWEST_PRIORITY
,
968 TD_SIGNO_MASK
, TD_THR_ANY_USER_FLAGS
);
970 error ("Cannot find new threads: %s", thread_db_err_str (err
));
974 thread_db_pid_to_str (ptid_t ptid
)
976 if (is_thread (ptid
))
983 err
= td_ta_map_id2thr_p (thread_agent
, GET_THREAD (ptid
), &th
);
985 error ("Cannot find thread %ld: %s",
986 (long) GET_THREAD (ptid
), thread_db_err_str (err
));
988 err
= td_thr_get_info_p (&th
, &ti
);
990 error ("Cannot get thread info for thread %ld: %s",
991 (long) GET_THREAD (ptid
), thread_db_err_str (err
));
993 if (ti
.ti_state
== TD_THR_ACTIVE
&& ti
.ti_lid
!= 0)
995 snprintf (buf
, sizeof (buf
), "Thread %ld (LWP %d)",
996 (long) ti
.ti_tid
, ti
.ti_lid
);
1000 snprintf (buf
, sizeof (buf
), "Thread %ld (%s)",
1001 (long) ti
.ti_tid
, thread_db_state_str (ti
.ti_state
));
1007 if (target_beneath
->to_pid_to_str (ptid
))
1008 return target_beneath
->to_pid_to_str (ptid
);
1010 return normal_pid_to_str (ptid
);
1013 /* Get the address of the thread local variable in OBJFILE which is
1014 stored at OFFSET within the thread local storage for thread PTID. */
1017 thread_db_get_thread_local_address (ptid_t ptid
, struct objfile
*objfile
,
1020 if (is_thread (ptid
))
1022 int objfile_is_library
= (objfile
->flags
& OBJF_SHARED
);
1028 /* glibc doesn't provide the needed interface. */
1029 if (! td_thr_tls_get_addr_p
)
1030 error ("Cannot find thread-local variables in this thread library.");
1032 /* Get the address of the link map for this objfile. */
1033 lm
= svr4_fetch_objfile_link_map (objfile
);
1035 /* Whoops, we couldn't find one. Bail out. */
1038 if (objfile_is_library
)
1039 error ("Cannot find shared library `%s' link_map in dynamic"
1040 " linker's module list", objfile
->name
);
1042 error ("Cannot find executable file `%s' link_map in dynamic"
1043 " linker's module list", objfile
->name
);
1046 /* Get info about the thread. */
1047 err
= td_ta_map_id2thr_p (thread_agent
, GET_THREAD (ptid
), &th
);
1049 error ("Cannot find thread %ld: %s",
1050 (long) GET_THREAD (ptid
), thread_db_err_str (err
));
1052 /* Finally, get the address of the variable. */
1053 err
= td_thr_tls_get_addr_p (&th
, (void *) lm
, offset
, &address
);
1055 #ifdef THREAD_DB_HAS_TD_NOTALLOC
1056 /* The memory hasn't been allocated, yet. */
1057 if (err
== TD_NOTALLOC
)
1059 /* Now, if libthread_db provided the initialization image's
1060 address, we *could* try to build a non-lvalue value from
1061 the initialization image. */
1062 if (objfile_is_library
)
1063 error ("The inferior has not yet allocated storage for"
1064 " thread-local variables in\n"
1065 "the shared library `%s'\n"
1066 "for the thread %ld",
1067 objfile
->name
, (long) GET_THREAD (ptid
));
1069 error ("The inferior has not yet allocated storage for"
1070 " thread-local variables in\n"
1071 "the executable `%s'\n"
1072 "for the thread %ld",
1073 objfile
->name
, (long) GET_THREAD (ptid
));
1077 /* Something else went wrong. */
1080 if (objfile_is_library
)
1081 error ("Cannot find thread-local storage for thread %ld, "
1082 "shared library %s:\n%s",
1083 (long) GET_THREAD (ptid
),
1085 thread_db_err_str (err
));
1087 error ("Cannot find thread-local storage for thread %ld, "
1088 "executable file %s:\n%s",
1089 (long) GET_THREAD (ptid
),
1091 thread_db_err_str (err
));
1094 /* Cast assuming host == target. Joy. */
1095 return (CORE_ADDR
) address
;
1098 if (target_beneath
->to_get_thread_local_address
)
1099 return target_beneath
->to_get_thread_local_address (ptid
, objfile
, offset
);
1101 error ("Cannot find thread-local values on this target.");
1105 init_thread_db_ops (void)
1107 thread_db_ops
.to_shortname
= "multi-thread";
1108 thread_db_ops
.to_longname
= "multi-threaded child process.";
1109 thread_db_ops
.to_doc
= "Threads and pthreads support.";
1110 thread_db_ops
.to_attach
= thread_db_attach
;
1111 thread_db_ops
.to_detach
= thread_db_detach
;
1112 thread_db_ops
.to_resume
= thread_db_resume
;
1113 thread_db_ops
.to_wait
= thread_db_wait
;
1114 thread_db_ops
.to_fetch_registers
= thread_db_fetch_registers
;
1115 thread_db_ops
.to_store_registers
= thread_db_store_registers
;
1116 thread_db_ops
.to_xfer_memory
= thread_db_xfer_memory
;
1117 thread_db_ops
.to_kill
= thread_db_kill
;
1118 thread_db_ops
.to_create_inferior
= thread_db_create_inferior
;
1119 thread_db_ops
.to_post_startup_inferior
= thread_db_post_startup_inferior
;
1120 thread_db_ops
.to_mourn_inferior
= thread_db_mourn_inferior
;
1121 thread_db_ops
.to_thread_alive
= thread_db_thread_alive
;
1122 thread_db_ops
.to_find_new_threads
= thread_db_find_new_threads
;
1123 thread_db_ops
.to_pid_to_str
= thread_db_pid_to_str
;
1124 thread_db_ops
.to_stratum
= thread_stratum
;
1125 thread_db_ops
.to_has_thread_control
= tc_schedlock
;
1126 thread_db_ops
.to_get_thread_local_address
1127 = thread_db_get_thread_local_address
;
1128 thread_db_ops
.to_magic
= OPS_MAGIC
;
1132 _initialize_thread_db (void)
1134 /* Only initialize the module if we can load libthread_db. */
1135 if (thread_db_load ())
1137 init_thread_db_ops ();
1138 add_target (&thread_db_ops
);
1140 /* Add ourselves to objfile event chain. */
1141 target_new_objfile_chain
= target_new_objfile_hook
;
1142 target_new_objfile_hook
= thread_db_new_objfile
;