1 /* Low-level child interface to ttrace.
3 Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
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 /* The ttrace(2) system call didn't exist before HP-UX 10.30. Don't
24 try to compile this code unless we have it. */
29 #include "gdbthread.h"
34 #include "gdb_assert.h"
35 #include "gdb_string.h"
37 #include <sys/ttrace.h>
40 #include "inf-child.h"
41 #include "inf-ttrace.h"
45 /* HP-UX uses a threading model where each user-space thread
46 corresponds to a kernel thread. These kernel threads are called
47 lwps. The ttrace(2) interface gives us almost full control over
48 the threads, which makes it very easy to support them in GDB. We
49 identify the threads by process ID and lwp ID. The ttrace(2) also
50 provides us with a thread's user ID (in the `tts_user_tid' member
51 of `ttstate_t') but we don't use that (yet) as it isn't necessary
52 to uniquely label the thread. */
54 /* Number of active lwps. */
55 static int inf_ttrace_num_lwps
;
58 /* On HP-UX versions that have the ttrace(2) system call, we can
59 implement "hardware" watchpoints by fiddling with the protection of
60 pages in the address space that contain the variable being watched.
61 In order to implement this, we keep a dictionary of pages for which
62 we have changed the protection. */
64 struct inf_ttrace_page
66 CORE_ADDR addr
; /* Page address. */
67 int prot
; /* Protection. */
68 int refcount
; /* Reference count. */
69 struct inf_ttrace_page
*next
;
70 struct inf_ttrace_page
*prev
;
73 struct inf_ttrace_page_dict
75 struct inf_ttrace_page buckets
[128];
76 int pagesize
; /* Page size. */
77 int count
; /* Number of pages in this dictionary. */
78 } inf_ttrace_page_dict
;
80 struct inf_ttrace_private_thread_info
85 /* Number of lwps that are currently in a system call. */
86 static int inf_ttrace_num_lwps_in_syscall
;
88 /* Flag to indicate whether we should re-enable page protections after
90 static int inf_ttrace_reenable_page_protections
;
92 /* Enable system call events for process PID. */
95 inf_ttrace_enable_syscall_events (pid_t pid
)
100 gdb_assert (inf_ttrace_num_lwps_in_syscall
== 0);
102 if (ttrace (TT_PROC_GET_EVENT_MASK
, pid
, 0,
103 (uintptr_t)&tte
, sizeof tte
, 0) == -1)
104 perror_with_name (("ttrace"));
106 tte
.tte_events
|= (TTEVT_SYSCALL_ENTRY
| TTEVT_SYSCALL_RETURN
);
108 if (ttrace (TT_PROC_SET_EVENT_MASK
, pid
, 0,
109 (uintptr_t)&tte
, sizeof tte
, 0) == -1)
110 perror_with_name (("ttrace"));
112 if (ttrace (TT_PROC_GET_FIRST_LWP_STATE
, pid
, 0,
113 (uintptr_t)&tts
, sizeof tts
, 0) == -1)
114 perror_with_name (("ttrace"));
116 if (tts
.tts_flags
& TTS_INSYSCALL
)
117 inf_ttrace_num_lwps_in_syscall
++;
119 /* FIXME: Handle multiple threads. */
122 /* Disable system call events for process PID. */
125 inf_ttrace_disable_syscall_events (pid_t pid
)
129 gdb_assert (inf_ttrace_page_dict
.count
== 0);
131 if (ttrace (TT_PROC_GET_EVENT_MASK
, pid
, 0,
132 (uintptr_t)&tte
, sizeof tte
, 0) == -1)
133 perror_with_name (("ttrace"));
135 tte
.tte_events
&= ~(TTEVT_SYSCALL_ENTRY
| TTEVT_SYSCALL_RETURN
);
137 if (ttrace (TT_PROC_SET_EVENT_MASK
, pid
, 0,
138 (uintptr_t)&tte
, sizeof tte
, 0) == -1)
139 perror_with_name (("ttrace"));
141 inf_ttrace_num_lwps_in_syscall
= 0;
144 /* Get information about the page at address ADDR for process PID from
147 static struct inf_ttrace_page
*
148 inf_ttrace_get_page (pid_t pid
, CORE_ADDR addr
)
150 const int num_buckets
= ARRAY_SIZE (inf_ttrace_page_dict
.buckets
);
151 const int pagesize
= inf_ttrace_page_dict
.pagesize
;
153 struct inf_ttrace_page
*page
;
155 bucket
= (addr
/ pagesize
) % num_buckets
;
156 page
= &inf_ttrace_page_dict
.buckets
[bucket
];
159 if (page
->addr
== addr
)
168 /* Add the page at address ADDR for process PID to the dictionary. */
170 static struct inf_ttrace_page
*
171 inf_ttrace_add_page (pid_t pid
, CORE_ADDR addr
)
173 const int num_buckets
= ARRAY_SIZE (inf_ttrace_page_dict
.buckets
);
174 const int pagesize
= inf_ttrace_page_dict
.pagesize
;
176 struct inf_ttrace_page
*page
;
177 struct inf_ttrace_page
*prev
= NULL
;
179 bucket
= (addr
/ pagesize
) % num_buckets
;
180 page
= &inf_ttrace_page_dict
.buckets
[bucket
];
183 if (page
->addr
== addr
)
194 if (ttrace (TT_PROC_GET_MPROTECT
, pid
, 0,
195 addr
, 0, (uintptr_t)&prot
) == -1)
196 perror_with_name (("ttrace"));
198 page
= XMALLOC (struct inf_ttrace_page
);
207 inf_ttrace_page_dict
.count
++;
208 if (inf_ttrace_page_dict
.count
== 1)
209 inf_ttrace_enable_syscall_events (pid
);
211 if (inf_ttrace_num_lwps_in_syscall
== 0)
213 if (ttrace (TT_PROC_SET_MPROTECT
, pid
, 0,
214 addr
, pagesize
, prot
& ~PROT_WRITE
) == -1)
215 perror_with_name (("ttrace"));
222 /* Insert the page at address ADDR of process PID to the dictionary. */
225 inf_ttrace_insert_page (pid_t pid
, CORE_ADDR addr
)
227 struct inf_ttrace_page
*page
;
229 page
= inf_ttrace_get_page (pid
, addr
);
231 page
= inf_ttrace_add_page (pid
, addr
);
236 /* Remove the page at address ADDR of process PID from the dictionary. */
239 inf_ttrace_remove_page (pid_t pid
, CORE_ADDR addr
)
241 const int pagesize
= inf_ttrace_page_dict
.pagesize
;
242 struct inf_ttrace_page
*page
;
244 page
= inf_ttrace_get_page (pid
, addr
);
247 gdb_assert (page
->refcount
>= 0);
249 if (page
->refcount
== 0)
251 if (inf_ttrace_num_lwps_in_syscall
== 0)
253 if (ttrace (TT_PROC_SET_MPROTECT
, pid
, 0,
254 addr
, pagesize
, page
->prot
) == -1)
255 perror_with_name (("ttrace"));
258 inf_ttrace_page_dict
.count
--;
259 if (inf_ttrace_page_dict
.count
== 0)
260 inf_ttrace_disable_syscall_events (pid
);
262 page
->prev
->next
= page
->next
;
264 page
->next
->prev
= page
->prev
;
270 /* Mask the bits in PROT from the page protections that are currently
271 in the dictionary for process PID. */
274 inf_ttrace_mask_page_protections (pid_t pid
, int prot
)
276 const int num_buckets
= ARRAY_SIZE (inf_ttrace_page_dict
.buckets
);
277 const int pagesize
= inf_ttrace_page_dict
.pagesize
;
280 for (bucket
= 0; bucket
< num_buckets
; bucket
++)
282 struct inf_ttrace_page
*page
;
284 page
= inf_ttrace_page_dict
.buckets
[bucket
].next
;
287 if (ttrace (TT_PROC_SET_MPROTECT
, pid
, 0,
288 page
->addr
, pagesize
, page
->prot
& ~prot
) == -1)
289 perror_with_name (("ttrace"));
296 /* Write-protect the pages in the dictionary for process PID. */
299 inf_ttrace_enable_page_protections (pid_t pid
)
301 inf_ttrace_mask_page_protections (pid
, PROT_WRITE
);
304 /* Restore the protection of the pages in the dictionary for process
308 inf_ttrace_disable_page_protections (pid_t pid
)
310 inf_ttrace_mask_page_protections (pid
, 0);
313 /* Insert a "hardware" watchpoint for LEN bytes at address ADDR of
317 inf_ttrace_insert_watchpoint (CORE_ADDR addr
, int len
, int type
,
318 struct expression
*cond
)
320 const int pagesize
= inf_ttrace_page_dict
.pagesize
;
321 pid_t pid
= ptid_get_pid (inferior_ptid
);
326 gdb_assert (type
== hw_write
);
328 page_addr
= (addr
/ pagesize
) * pagesize
;
329 num_pages
= (len
+ pagesize
- 1) / pagesize
;
331 for (page
= 0; page
< num_pages
; page
++, page_addr
+= pagesize
)
332 inf_ttrace_insert_page (pid
, page_addr
);
337 /* Remove a "hardware" watchpoint for LEN bytes at address ADDR of
341 inf_ttrace_remove_watchpoint (CORE_ADDR addr
, int len
, int type
,
342 struct expression
*cond
)
344 const int pagesize
= inf_ttrace_page_dict
.pagesize
;
345 pid_t pid
= ptid_get_pid (inferior_ptid
);
350 gdb_assert (type
== hw_write
);
352 page_addr
= (addr
/ pagesize
) * pagesize
;
353 num_pages
= (len
+ pagesize
- 1) / pagesize
;
355 for (page
= 0; page
< num_pages
; page
++, page_addr
+= pagesize
)
356 inf_ttrace_remove_page (pid
, page_addr
);
362 inf_ttrace_can_use_hw_breakpoint (int type
, int len
, int ot
)
364 return (type
== bp_hardware_watchpoint
);
368 inf_ttrace_region_ok_for_hw_watchpoint (CORE_ADDR addr
, int len
)
373 /* Return non-zero if the current inferior was (potentially) stopped
374 by hitting a "hardware" watchpoint. */
377 inf_ttrace_stopped_by_watchpoint (void)
379 pid_t pid
= ptid_get_pid (inferior_ptid
);
380 lwpid_t lwpid
= ptid_get_lwp (inferior_ptid
);
383 if (inf_ttrace_page_dict
.count
> 0)
385 if (ttrace (TT_LWP_GET_STATE
, pid
, lwpid
,
386 (uintptr_t)&tts
, sizeof tts
, 0) == -1)
387 perror_with_name (("ttrace"));
389 if (tts
.tts_event
== TTEVT_SIGNAL
390 && tts
.tts_u
.tts_signal
.tts_signo
== SIGBUS
)
392 const int pagesize
= inf_ttrace_page_dict
.pagesize
;
393 void *addr
= tts
.tts_u
.tts_signal
.tts_siginfo
.si_addr
;
394 CORE_ADDR page_addr
= ((uintptr_t)addr
/ pagesize
) * pagesize
;
396 if (inf_ttrace_get_page (pid
, page_addr
))
405 /* When tracking a vfork(2), we cannot detach from the parent until
406 after the child has called exec(3) or has exited. If we are still
407 attached to the parent, this variable will be set to the process ID
408 of the parent. Otherwise it will be set to zero. */
409 static pid_t inf_ttrace_vfork_ppid
= -1;
412 inf_ttrace_follow_fork (struct target_ops
*ops
, int follow_child
)
415 lwpid_t lwpid
, flwpid
;
417 struct thread_info
*tp
= inferior_thread ();
419 gdb_assert (tp
->pending_follow
.kind
== TARGET_WAITKIND_FORKED
420 || tp
->pending_follow
.kind
== TARGET_WAITKIND_VFORKED
);
422 pid
= ptid_get_pid (inferior_ptid
);
423 lwpid
= ptid_get_lwp (inferior_ptid
);
425 /* Get all important details that core GDB doesn't (and shouldn't)
427 if (ttrace (TT_LWP_GET_STATE
, pid
, lwpid
,
428 (uintptr_t)&tts
, sizeof tts
, 0) == -1)
429 perror_with_name (("ttrace"));
431 gdb_assert (tts
.tts_event
== TTEVT_FORK
|| tts
.tts_event
== TTEVT_VFORK
);
433 if (tts
.tts_u
.tts_fork
.tts_isparent
)
436 lwpid
= tts
.tts_lwpid
;
437 fpid
= tts
.tts_u
.tts_fork
.tts_fpid
;
438 flwpid
= tts
.tts_u
.tts_fork
.tts_flwpid
;
442 pid
= tts
.tts_u
.tts_fork
.tts_fpid
;
443 lwpid
= tts
.tts_u
.tts_fork
.tts_flwpid
;
445 flwpid
= tts
.tts_lwpid
;
450 struct inferior
*inf
;
451 struct inferior
*parent_inf
;
453 parent_inf
= find_inferior_pid (pid
);
455 inferior_ptid
= ptid_build (fpid
, flwpid
, 0);
456 inf
= add_inferior (fpid
);
457 inf
->attach_flag
= parent_inf
->attach_flag
;
458 inf
->pspace
= parent_inf
->pspace
;
459 inf
->aspace
= parent_inf
->aspace
;
460 copy_terminal_info (inf
, parent_inf
);
461 detach_breakpoints (pid
);
463 target_terminal_ours ();
464 fprintf_unfiltered (gdb_stdlog
,
465 _("Attaching after fork to child process %ld.\n"),
470 inferior_ptid
= ptid_build (pid
, lwpid
, 0);
471 detach_breakpoints (fpid
);
473 target_terminal_ours ();
474 fprintf_unfiltered (gdb_stdlog
,
475 _("Detaching after fork from child process %ld.\n"),
479 if (tts
.tts_event
== TTEVT_VFORK
)
481 gdb_assert (!tts
.tts_u
.tts_fork
.tts_isparent
);
485 /* We can't detach from the parent yet. */
486 inf_ttrace_vfork_ppid
= pid
;
488 reattach_breakpoints (fpid
);
492 if (ttrace (TT_PROC_DETACH
, fpid
, 0, 0, 0, 0) == -1)
493 perror_with_name (("ttrace"));
495 /* Wait till we get the TTEVT_VFORK event in the parent.
496 This indicates that the child has called exec(3) or has
497 exited and that the parent is ready to be traced again. */
498 if (ttrace_wait (pid
, lwpid
, TTRACE_WAITOK
, &tts
, sizeof tts
) == -1)
499 perror_with_name (("ttrace_wait"));
500 gdb_assert (tts
.tts_event
== TTEVT_VFORK
);
501 gdb_assert (tts
.tts_u
.tts_fork
.tts_isparent
);
503 reattach_breakpoints (pid
);
508 gdb_assert (tts
.tts_u
.tts_fork
.tts_isparent
);
512 if (ttrace (TT_PROC_DETACH
, pid
, 0, 0, 0, 0) == -1)
513 perror_with_name (("ttrace"));
517 if (ttrace (TT_PROC_DETACH
, fpid
, 0, 0, 0, 0) == -1)
518 perror_with_name (("ttrace"));
524 struct thread_info
*ti
;
526 /* The child will start out single-threaded. */
527 inf_ttrace_num_lwps
= 1;
528 inf_ttrace_num_lwps_in_syscall
= 0;
531 delete_thread_silent (ptid_build (pid
, lwpid
, 0));
532 detach_inferior (pid
);
534 /* Add child thread. inferior_ptid was already set above. */
535 ti
= add_thread_silent (inferior_ptid
);
537 xmalloc (sizeof (struct inf_ttrace_private_thread_info
));
538 memset (ti
->private, 0,
539 sizeof (struct inf_ttrace_private_thread_info
));
546 /* File descriptors for pipes used as semaphores during initial
547 startup of an inferior. */
548 static int inf_ttrace_pfd1
[2];
549 static int inf_ttrace_pfd2
[2];
552 do_cleanup_pfds (void *dummy
)
554 close (inf_ttrace_pfd1
[0]);
555 close (inf_ttrace_pfd1
[1]);
556 close (inf_ttrace_pfd2
[0]);
557 close (inf_ttrace_pfd2
[1]);
561 inf_ttrace_prepare (void)
563 if (pipe (inf_ttrace_pfd1
) == -1)
564 perror_with_name (("pipe"));
566 if (pipe (inf_ttrace_pfd2
) == -1)
568 close (inf_ttrace_pfd1
[0]);
569 close (inf_ttrace_pfd2
[0]);
570 perror_with_name (("pipe"));
574 /* Prepare to be traced. */
579 struct cleanup
*old_chain
= make_cleanup (do_cleanup_pfds
, 0);
582 /* "Trace me, Dr. Memory!" */
583 if (ttrace (TT_PROC_SETTRC
, 0, 0, 0, TT_VERSION
, 0) == -1)
584 perror_with_name (("ttrace"));
586 /* Tell our parent that we are ready to be traced. */
587 if (write (inf_ttrace_pfd1
[1], &c
, sizeof c
) != sizeof c
)
588 perror_with_name (("write"));
590 /* Wait until our parent has set the initial event mask. */
591 if (read (inf_ttrace_pfd2
[0], &c
, sizeof c
) != sizeof c
)
592 perror_with_name (("read"));
594 do_cleanups (old_chain
);
597 /* Start tracing PID. */
600 inf_ttrace_him (struct target_ops
*ops
, int pid
)
602 struct cleanup
*old_chain
= make_cleanup (do_cleanup_pfds
, 0);
606 /* Wait until our child is ready to be traced. */
607 if (read (inf_ttrace_pfd1
[0], &c
, sizeof c
) != sizeof c
)
608 perror_with_name (("read"));
610 /* Set the initial event mask. */
611 memset (&tte
, 0, sizeof (tte
));
612 tte
.tte_events
|= TTEVT_EXEC
| TTEVT_EXIT
| TTEVT_FORK
| TTEVT_VFORK
;
613 tte
.tte_events
|= TTEVT_LWP_CREATE
| TTEVT_LWP_EXIT
| TTEVT_LWP_TERMINATE
;
614 #ifdef TTEVT_BPT_SSTEP
615 tte
.tte_events
|= TTEVT_BPT_SSTEP
;
617 tte
.tte_opts
|= TTEO_PROC_INHERIT
;
618 if (ttrace (TT_PROC_SET_EVENT_MASK
, pid
, 0,
619 (uintptr_t)&tte
, sizeof tte
, 0) == -1)
620 perror_with_name (("ttrace"));
622 /* Tell our child that we have set the initial event mask. */
623 if (write (inf_ttrace_pfd2
[1], &c
, sizeof c
) != sizeof c
)
624 perror_with_name (("write"));
626 do_cleanups (old_chain
);
630 /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will
631 be 1 or 2 depending on whether we're starting without or with a
633 startup_inferior (START_INFERIOR_TRAPS_EXPECTED
);
635 /* On some targets, there must be some explicit actions taken after
636 the inferior has been started up. */
637 target_post_startup_inferior (pid_to_ptid (pid
));
641 inf_ttrace_create_inferior (struct target_ops
*ops
, char *exec_file
,
642 char *allargs
, char **env
, int from_tty
)
646 gdb_assert (inf_ttrace_num_lwps
== 0);
647 gdb_assert (inf_ttrace_num_lwps_in_syscall
== 0);
648 gdb_assert (inf_ttrace_page_dict
.count
== 0);
649 gdb_assert (inf_ttrace_reenable_page_protections
== 0);
650 gdb_assert (inf_ttrace_vfork_ppid
== -1);
652 pid
= fork_inferior (exec_file
, allargs
, env
, inf_ttrace_me
, NULL
,
653 inf_ttrace_prepare
, NULL
);
655 inf_ttrace_him (ops
, pid
);
659 inf_ttrace_mourn_inferior (struct target_ops
*ops
)
661 const int num_buckets
= ARRAY_SIZE (inf_ttrace_page_dict
.buckets
);
664 inf_ttrace_num_lwps
= 0;
665 inf_ttrace_num_lwps_in_syscall
= 0;
667 for (bucket
= 0; bucket
< num_buckets
; bucket
++)
669 struct inf_ttrace_page
*page
;
670 struct inf_ttrace_page
*next
;
672 page
= inf_ttrace_page_dict
.buckets
[bucket
].next
;
680 inf_ttrace_page_dict
.count
= 0;
683 generic_mourn_inferior ();
687 inf_ttrace_attach (struct target_ops
*ops
, char *args
, int from_tty
)
692 struct inferior
*inf
;
694 pid
= parse_pid_to_attach (args
);
696 if (pid
== getpid ()) /* Trying to masturbate? */
697 error (_("I refuse to debug myself!"));
701 exec_file
= get_exec_file (0);
704 printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file
,
705 target_pid_to_str (pid_to_ptid (pid
)));
707 printf_unfiltered (_("Attaching to %s\n"),
708 target_pid_to_str (pid_to_ptid (pid
)));
710 gdb_flush (gdb_stdout
);
713 gdb_assert (inf_ttrace_num_lwps
== 0);
714 gdb_assert (inf_ttrace_num_lwps_in_syscall
== 0);
715 gdb_assert (inf_ttrace_vfork_ppid
== -1);
717 if (ttrace (TT_PROC_ATTACH
, pid
, 0, TT_KILL_ON_EXIT
, TT_VERSION
, 0) == -1)
718 perror_with_name (("ttrace"));
720 inf
= current_inferior ();
721 inferior_appeared (inf
, pid
);
722 inf
->attach_flag
= 1;
724 /* Set the initial event mask. */
725 memset (&tte
, 0, sizeof (tte
));
726 tte
.tte_events
|= TTEVT_EXEC
| TTEVT_EXIT
| TTEVT_FORK
| TTEVT_VFORK
;
727 tte
.tte_events
|= TTEVT_LWP_CREATE
| TTEVT_LWP_EXIT
| TTEVT_LWP_TERMINATE
;
728 #ifdef TTEVT_BPT_SSTEP
729 tte
.tte_events
|= TTEVT_BPT_SSTEP
;
731 tte
.tte_opts
|= TTEO_PROC_INHERIT
;
732 if (ttrace (TT_PROC_SET_EVENT_MASK
, pid
, 0,
733 (uintptr_t)&tte
, sizeof tte
, 0) == -1)
734 perror_with_name (("ttrace"));
738 /* We'll bump inf_ttrace_num_lwps up and add the private data to the
739 thread as soon as we get to inf_ttrace_wait. At this point, we
740 don't have lwpid info yet. */
741 inferior_ptid
= pid_to_ptid (pid
);
742 add_thread_silent (inferior_ptid
);
746 inf_ttrace_detach (struct target_ops
*ops
, char *args
, int from_tty
)
748 pid_t pid
= ptid_get_pid (inferior_ptid
);
753 char *exec_file
= get_exec_file (0);
756 printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file
,
757 target_pid_to_str (pid_to_ptid (pid
)));
758 gdb_flush (gdb_stdout
);
763 /* ??? The HP-UX 11.0 ttrace(2) manual page doesn't mention that we
764 can pass a signal number here. Does this really work? */
765 if (ttrace (TT_PROC_DETACH
, pid
, 0, 0, sig
, 0) == -1)
766 perror_with_name (("ttrace"));
768 if (inf_ttrace_vfork_ppid
!= -1)
770 if (ttrace (TT_PROC_DETACH
, inf_ttrace_vfork_ppid
, 0, 0, 0, 0) == -1)
771 perror_with_name (("ttrace"));
772 inf_ttrace_vfork_ppid
= -1;
775 inf_ttrace_num_lwps
= 0;
776 inf_ttrace_num_lwps_in_syscall
= 0;
778 inferior_ptid
= null_ptid
;
779 detach_inferior (pid
);
785 inf_ttrace_kill (struct target_ops
*ops
)
787 pid_t pid
= ptid_get_pid (inferior_ptid
);
792 if (ttrace (TT_PROC_EXIT
, pid
, 0, 0, 0, 0) == -1)
793 perror_with_name (("ttrace"));
794 /* ??? Is it necessary to call ttrace_wait() here? */
796 if (inf_ttrace_vfork_ppid
!= -1)
798 if (ttrace (TT_PROC_DETACH
, inf_ttrace_vfork_ppid
, 0, 0, 0, 0) == -1)
799 perror_with_name (("ttrace"));
800 inf_ttrace_vfork_ppid
= -1;
803 target_mourn_inferior ();
806 /* Check is a dying thread is dead by now, and delete it from GDBs
807 thread list if so. */
809 inf_ttrace_delete_dead_threads_callback (struct thread_info
*info
, void *arg
)
812 struct inf_ttrace_private_thread_info
*p
;
814 if (is_exited (info
->ptid
))
817 lwpid
= ptid_get_lwp (info
->ptid
);
818 p
= (struct inf_ttrace_private_thread_info
*) info
->private;
820 /* Check if an lwp that was dying is still there or not. */
821 if (p
->dying
&& (kill (lwpid
, 0) == -1))
823 delete_thread (info
->ptid
);
828 /* Resume the lwp pointed to by INFO, with REQUEST, and pass it signal
832 inf_ttrace_resume_lwp (struct thread_info
*info
, ttreq_t request
, int sig
)
834 pid_t pid
= ptid_get_pid (info
->ptid
);
835 lwpid_t lwpid
= ptid_get_lwp (info
->ptid
);
837 if (ttrace (request
, pid
, lwpid
, TT_NOPC
, sig
, 0) == -1)
839 struct inf_ttrace_private_thread_info
*p
840 = (struct inf_ttrace_private_thread_info
*) info
->private;
841 if (p
->dying
&& errno
== EPROTO
)
842 /* This is expected, it means the dying lwp is really gone
843 by now. If ttrace had an event to inform the debugger
844 the lwp is really gone, this wouldn't be needed. */
845 delete_thread (info
->ptid
);
847 /* This was really unexpected. */
848 perror_with_name (("ttrace"));
852 /* Callback for iterate_over_threads. */
855 inf_ttrace_resume_callback (struct thread_info
*info
, void *arg
)
857 if (!ptid_equal (info
->ptid
, inferior_ptid
) && !is_exited (info
->ptid
))
858 inf_ttrace_resume_lwp (info
, TT_LWP_CONTINUE
, 0);
864 inf_ttrace_resume (struct target_ops
*ops
,
865 ptid_t ptid
, int step
, enum target_signal signal
)
868 ttreq_t request
= step
? TT_LWP_SINGLE
: TT_LWP_CONTINUE
;
869 int sig
= target_signal_to_host (signal
);
870 struct thread_info
*info
;
872 /* A specific PTID means `step only this process id'. */
873 resume_all
= (ptid_equal (ptid
, minus_one_ptid
));
875 /* If resuming all threads, it's the current thread that should be
876 handled specially. */
878 ptid
= inferior_ptid
;
880 info
= find_thread_ptid (ptid
);
881 inf_ttrace_resume_lwp (info
, request
, sig
);
884 /* Let all the other threads run too. */
885 iterate_over_threads (inf_ttrace_resume_callback
, NULL
);
889 inf_ttrace_wait (struct target_ops
*ops
,
890 ptid_t ptid
, struct target_waitstatus
*ourstatus
, int options
)
892 pid_t pid
= ptid_get_pid (ptid
);
893 lwpid_t lwpid
= ptid_get_lwp (ptid
);
895 struct thread_info
*ti
;
898 /* Until proven otherwise. */
899 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
904 gdb_assert (pid
!= 0 || lwpid
== 0);
910 if (ttrace_wait (pid
, lwpid
, TTRACE_WAITOK
, &tts
, sizeof tts
) == -1)
911 perror_with_name (("ttrace_wait"));
913 if (tts
.tts_event
== TTEVT_VFORK
&& tts
.tts_u
.tts_fork
.tts_isparent
)
915 if (inf_ttrace_vfork_ppid
!= -1)
917 gdb_assert (inf_ttrace_vfork_ppid
== tts
.tts_pid
);
919 if (ttrace (TT_PROC_DETACH
, tts
.tts_pid
, 0, 0, 0, 0) == -1)
920 perror_with_name (("ttrace"));
921 inf_ttrace_vfork_ppid
= -1;
924 tts
.tts_event
= TTEVT_NONE
;
927 clear_sigint_trap ();
929 while (tts
.tts_event
== TTEVT_NONE
);
931 /* Now that we've waited, we can re-enable the page protections. */
932 if (inf_ttrace_reenable_page_protections
)
934 gdb_assert (inf_ttrace_num_lwps_in_syscall
== 0);
935 inf_ttrace_enable_page_protections (tts
.tts_pid
);
936 inf_ttrace_reenable_page_protections
= 0;
939 ptid
= ptid_build (tts
.tts_pid
, tts
.tts_lwpid
, 0);
941 if (inf_ttrace_num_lwps
== 0)
943 struct thread_info
*ti
;
945 inf_ttrace_num_lwps
= 1;
947 /* This is the earliest we hear about the lwp member of
948 INFERIOR_PTID, after an attach or fork_inferior. */
949 gdb_assert (ptid_get_lwp (inferior_ptid
) == 0);
951 /* We haven't set the private member on the main thread yet. Do
953 ti
= find_thread_ptid (inferior_ptid
);
954 gdb_assert (ti
!= NULL
&& ti
->private == NULL
);
956 xmalloc (sizeof (struct inf_ttrace_private_thread_info
));
957 memset (ti
->private, 0,
958 sizeof (struct inf_ttrace_private_thread_info
));
960 /* Notify the core that this ptid changed. This changes
961 inferior_ptid as well. */
962 thread_change_ptid (inferior_ptid
, ptid
);
965 switch (tts
.tts_event
)
967 #ifdef TTEVT_BPT_SSTEP
968 case TTEVT_BPT_SSTEP
:
969 /* Make it look like a breakpoint. */
970 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
971 ourstatus
->value
.sig
= TARGET_SIGNAL_TRAP
;
976 ourstatus
->kind
= TARGET_WAITKIND_EXECD
;
977 ourstatus
->value
.execd_pathname
=
978 xmalloc (tts
.tts_u
.tts_exec
.tts_pathlen
+ 1);
979 if (ttrace (TT_PROC_GET_PATHNAME
, tts
.tts_pid
, 0,
980 (uintptr_t)ourstatus
->value
.execd_pathname
,
981 tts
.tts_u
.tts_exec
.tts_pathlen
, 0) == -1)
982 perror_with_name (("ttrace"));
983 ourstatus
->value
.execd_pathname
[tts
.tts_u
.tts_exec
.tts_pathlen
] = 0;
985 /* At this point, all inserted breakpoints are gone. Doing this
986 as soon as we detect an exec prevents the badness of deleting
987 a breakpoint writing the current "shadow contents" to lift
988 the bp. That shadow is NOT valid after an exec. */
989 mark_breakpoints_out ();
993 store_waitstatus (ourstatus
, tts
.tts_u
.tts_exit
.tts_exitcode
);
994 inf_ttrace_num_lwps
= 0;
998 related_ptid
= ptid_build (tts
.tts_u
.tts_fork
.tts_fpid
,
999 tts
.tts_u
.tts_fork
.tts_flwpid
, 0);
1001 ourstatus
->kind
= TARGET_WAITKIND_FORKED
;
1002 ourstatus
->value
.related_pid
= related_ptid
;
1004 /* Make sure the other end of the fork is stopped too. */
1005 if (ttrace_wait (tts
.tts_u
.tts_fork
.tts_fpid
,
1006 tts
.tts_u
.tts_fork
.tts_flwpid
,
1007 TTRACE_WAITOK
, &tts
, sizeof tts
) == -1)
1008 perror_with_name (("ttrace_wait"));
1010 gdb_assert (tts
.tts_event
== TTEVT_FORK
);
1011 if (tts
.tts_u
.tts_fork
.tts_isparent
)
1013 related_ptid
= ptid_build (tts
.tts_u
.tts_fork
.tts_fpid
,
1014 tts
.tts_u
.tts_fork
.tts_flwpid
, 0);
1015 ptid
= ptid_build (tts
.tts_pid
, tts
.tts_lwpid
, 0);
1016 ourstatus
->value
.related_pid
= related_ptid
;
1021 gdb_assert (!tts
.tts_u
.tts_fork
.tts_isparent
);
1023 related_ptid
= ptid_build (tts
.tts_u
.tts_fork
.tts_fpid
,
1024 tts
.tts_u
.tts_fork
.tts_flwpid
, 0);
1026 ourstatus
->kind
= TARGET_WAITKIND_VFORKED
;
1027 ourstatus
->value
.related_pid
= related_ptid
;
1029 /* HACK: To avoid touching the parent during the vfork, switch
1031 inferior_ptid
= ptid
;
1034 case TTEVT_LWP_CREATE
:
1035 lwpid
= tts
.tts_u
.tts_thread
.tts_target_lwpid
;
1036 ptid
= ptid_build (tts
.tts_pid
, lwpid
, 0);
1037 ti
= add_thread (ptid
);
1039 xmalloc (sizeof (struct inf_ttrace_private_thread_info
));
1040 memset (ti
->private, 0,
1041 sizeof (struct inf_ttrace_private_thread_info
));
1042 inf_ttrace_num_lwps
++;
1043 ptid
= ptid_build (tts
.tts_pid
, tts
.tts_lwpid
, 0);
1044 /* Let the lwp_create-caller thread continue. */
1045 ttrace (TT_LWP_CONTINUE
, ptid_get_pid (ptid
),
1046 ptid_get_lwp (ptid
), TT_NOPC
, 0, 0);
1047 /* Return without stopping the whole process. */
1048 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
1051 case TTEVT_LWP_EXIT
:
1052 if (print_thread_events
)
1053 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid
));
1054 ti
= find_thread_ptid (ptid
);
1055 gdb_assert (ti
!= NULL
);
1056 ((struct inf_ttrace_private_thread_info
*)ti
->private)->dying
= 1;
1057 inf_ttrace_num_lwps
--;
1058 /* Let the thread really exit. */
1059 ttrace (TT_LWP_CONTINUE
, ptid_get_pid (ptid
),
1060 ptid_get_lwp (ptid
), TT_NOPC
, 0, 0);
1061 /* Return without stopping the whole process. */
1062 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
1065 case TTEVT_LWP_TERMINATE
:
1066 lwpid
= tts
.tts_u
.tts_thread
.tts_target_lwpid
;
1067 ptid
= ptid_build (tts
.tts_pid
, lwpid
, 0);
1068 if (print_thread_events
)
1069 printf_unfiltered(_("[%s has been terminated]\n"),
1070 target_pid_to_str (ptid
));
1071 ti
= find_thread_ptid (ptid
);
1072 gdb_assert (ti
!= NULL
);
1073 ((struct inf_ttrace_private_thread_info
*)ti
->private)->dying
= 1;
1074 inf_ttrace_num_lwps
--;
1076 /* Resume the lwp_terminate-caller thread. */
1077 ptid
= ptid_build (tts
.tts_pid
, tts
.tts_lwpid
, 0);
1078 ttrace (TT_LWP_CONTINUE
, ptid_get_pid (ptid
),
1079 ptid_get_lwp (ptid
), TT_NOPC
, 0, 0);
1080 /* Return without stopping the whole process. */
1081 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
1085 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
1086 ourstatus
->value
.sig
=
1087 target_signal_from_host (tts
.tts_u
.tts_signal
.tts_signo
);
1090 case TTEVT_SYSCALL_ENTRY
:
1091 gdb_assert (inf_ttrace_reenable_page_protections
== 0);
1092 inf_ttrace_num_lwps_in_syscall
++;
1093 if (inf_ttrace_num_lwps_in_syscall
== 1)
1095 /* A thread has just entered a system call. Disable any
1096 page protections as the kernel can't deal with them. */
1097 inf_ttrace_disable_page_protections (tts
.tts_pid
);
1099 ourstatus
->kind
= TARGET_WAITKIND_SYSCALL_ENTRY
;
1100 ourstatus
->value
.syscall_number
= tts
.tts_scno
;
1103 case TTEVT_SYSCALL_RETURN
:
1104 if (inf_ttrace_num_lwps_in_syscall
> 0)
1106 /* If the last thread has just left the system call, this
1107 would be a logical place to re-enable the page
1108 protections, but that doesn't work. We can't re-enable
1109 them until we've done another wait. */
1110 inf_ttrace_reenable_page_protections
=
1111 (inf_ttrace_num_lwps_in_syscall
== 1);
1112 inf_ttrace_num_lwps_in_syscall
--;
1114 ourstatus
->kind
= TARGET_WAITKIND_SYSCALL_RETURN
;
1115 ourstatus
->value
.syscall_number
= tts
.tts_scno
;
1119 gdb_assert (!"Unexpected ttrace event");
1123 /* Make sure all threads within the process are stopped. */
1124 if (ttrace (TT_PROC_STOP
, tts
.tts_pid
, 0, 0, 0, 0) == -1)
1125 perror_with_name (("ttrace"));
1127 /* Now that the whole process is stopped, check if any dying thread
1128 is really dead by now. If a dying thread is still alive, it will
1129 be stopped too, and will still show up in `info threads', tagged
1130 with "(Exiting)". We could make `info threads' prune dead
1131 threads instead via inf_ttrace_thread_alive, but doing this here
1132 has the advantage that a frontend is notificed sooner of thread
1133 exits. Note that a dying lwp is still alive, it still has to be
1134 resumed, like any other lwp. */
1135 iterate_over_threads (inf_ttrace_delete_dead_threads_callback
, NULL
);
1140 /* Transfer LEN bytes from ADDR in the inferior's memory into READBUF,
1141 and transfer LEN bytes from WRITEBUF into the inferior's memory at
1142 ADDR. Either READBUF or WRITEBUF may be null, in which case the
1143 corresponding transfer doesn't happen. Return the number of bytes
1144 actually transferred (which may be zero if an error occurs). */
1147 inf_ttrace_xfer_memory (CORE_ADDR addr
, ULONGEST len
,
1148 void *readbuf
, const void *writebuf
)
1150 pid_t pid
= ptid_get_pid (inferior_ptid
);
1152 /* HP-UX treats text space and data space differently. GDB however,
1153 doesn't really know the difference. Therefore we try both. Try
1154 text space before data space though because when we're writing
1155 into text space the instruction cache might need to be flushed. */
1158 && ttrace (TT_PROC_RDTEXT
, pid
, 0, addr
, len
, (uintptr_t)readbuf
) == -1
1159 && ttrace (TT_PROC_RDDATA
, pid
, 0, addr
, len
, (uintptr_t)readbuf
) == -1)
1163 && ttrace (TT_PROC_WRTEXT
, pid
, 0, addr
, len
, (uintptr_t)writebuf
) == -1
1164 && ttrace (TT_PROC_WRDATA
, pid
, 0, addr
, len
, (uintptr_t)writebuf
) == -1)
1171 inf_ttrace_xfer_partial (struct target_ops
*ops
, enum target_object object
,
1172 const char *annex
, gdb_byte
*readbuf
,
1173 const gdb_byte
*writebuf
,
1174 ULONGEST offset
, LONGEST len
)
1178 case TARGET_OBJECT_MEMORY
:
1179 return inf_ttrace_xfer_memory (offset
, len
, readbuf
, writebuf
);
1181 case TARGET_OBJECT_UNWIND_TABLE
:
1184 case TARGET_OBJECT_AUXV
:
1187 case TARGET_OBJECT_WCOOKIE
:
1195 /* Print status information about what we're accessing. */
1198 inf_ttrace_files_info (struct target_ops
*ignore
)
1200 struct inferior
*inf
= current_inferior ();
1201 printf_filtered (_("\tUsing the running image of %s %s.\n"),
1202 inf
->attach_flag
? "attached" : "child",
1203 target_pid_to_str (inferior_ptid
));
1207 inf_ttrace_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
1212 /* Return a string describing the state of the thread specified by
1216 inf_ttrace_extra_thread_info (struct thread_info
*info
)
1218 struct inf_ttrace_private_thread_info
* private =
1219 (struct inf_ttrace_private_thread_info
*) info
->private;
1221 if (private != NULL
&& private->dying
)
1228 inf_ttrace_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
1230 pid_t pid
= ptid_get_pid (ptid
);
1231 lwpid_t lwpid
= ptid_get_lwp (ptid
);
1232 static char buf
[128];
1235 xsnprintf (buf
, sizeof buf
, "process %ld",
1238 xsnprintf (buf
, sizeof buf
, "process %ld, lwp %ld",
1239 (long) pid
, (long) lwpid
);
1244 /* Implement the get_ada_task_ptid target_ops method. */
1247 inf_ttrace_get_ada_task_ptid (long lwp
, long thread
)
1249 return ptid_build (ptid_get_pid (inferior_ptid
), lwp
, 0);
1254 inf_ttrace_target (void)
1256 struct target_ops
*t
= inf_child_target ();
1258 t
->to_attach
= inf_ttrace_attach
;
1259 t
->to_detach
= inf_ttrace_detach
;
1260 t
->to_resume
= inf_ttrace_resume
;
1261 t
->to_wait
= inf_ttrace_wait
;
1262 t
->to_files_info
= inf_ttrace_files_info
;
1263 t
->to_can_use_hw_breakpoint
= inf_ttrace_can_use_hw_breakpoint
;
1264 t
->to_insert_watchpoint
= inf_ttrace_insert_watchpoint
;
1265 t
->to_remove_watchpoint
= inf_ttrace_remove_watchpoint
;
1266 t
->to_stopped_by_watchpoint
= inf_ttrace_stopped_by_watchpoint
;
1267 t
->to_region_ok_for_hw_watchpoint
=
1268 inf_ttrace_region_ok_for_hw_watchpoint
;
1269 t
->to_kill
= inf_ttrace_kill
;
1270 t
->to_create_inferior
= inf_ttrace_create_inferior
;
1271 t
->to_follow_fork
= inf_ttrace_follow_fork
;
1272 t
->to_mourn_inferior
= inf_ttrace_mourn_inferior
;
1273 t
->to_thread_alive
= inf_ttrace_thread_alive
;
1274 t
->to_extra_thread_info
= inf_ttrace_extra_thread_info
;
1275 t
->to_pid_to_str
= inf_ttrace_pid_to_str
;
1276 t
->to_xfer_partial
= inf_ttrace_xfer_partial
;
1277 t
->to_get_ada_task_ptid
= inf_ttrace_get_ada_task_ptid
;
1284 /* Prevent warning from -Wmissing-prototypes. */
1285 void _initialize_hppa_hpux_nat (void);
1288 _initialize_inf_ttrace (void)
1291 inf_ttrace_page_dict
.pagesize
= getpagesize();