1 /* GNU/Linux native-dependent code common to multiple platforms.
3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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/>. */
24 #include "gdb_string.h"
26 #include "gdb_assert.h"
27 #ifdef HAVE_TKILL_SYSCALL
29 #include <sys/syscall.h>
31 #include <sys/ptrace.h>
32 #include "linux-nat.h"
33 #include "linux-fork.h"
34 #include "gdbthread.h"
38 #include "inf-ptrace.h"
40 #include <sys/param.h> /* for MAXPATHLEN */
41 #include <sys/procfs.h> /* for elf_gregset etc. */
42 #include "elf-bfd.h" /* for elfcore_write_* */
43 #include "gregset.h" /* for gregset */
44 #include "gdbcore.h" /* for get_exec_file */
45 #include <ctype.h> /* for isdigit */
46 #include "gdbthread.h" /* for struct thread_info etc. */
47 #include "gdb_stat.h" /* for struct stat */
48 #include <fcntl.h> /* for O_RDONLY */
50 #include "event-loop.h"
51 #include "event-top.h"
53 #include <sys/types.h>
54 #include "gdb_dirent.h"
55 #include "xml-support.h"
61 #define SPUFS_MAGIC 0x23c9b64e
64 #ifdef HAVE_PERSONALITY
65 # include <sys/personality.h>
66 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
67 # define ADDR_NO_RANDOMIZE 0x0040000
69 #endif /* HAVE_PERSONALITY */
71 /* This comment documents high-level logic of this file.
73 Waiting for events in sync mode
74 ===============================
76 When waiting for an event in a specific thread, we just use waitpid, passing
77 the specific pid, and not passing WNOHANG.
79 When waiting for an event in all threads, waitpid is not quite good. Prior to
80 version 2.4, Linux can either wait for event in main thread, or in secondary
81 threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might
82 miss an event. The solution is to use non-blocking waitpid, together with
83 sigsuspend. First, we use non-blocking waitpid to get an event in the main
84 process, if any. Second, we use non-blocking waitpid with the __WCLONED
85 flag to check for events in cloned processes. If nothing is found, we use
86 sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something
87 happened to a child process -- and SIGCHLD will be delivered both for events
88 in main debugged process and in cloned processes. As soon as we know there's
89 an event, we get back to calling nonblocking waitpid with and without __WCLONED.
91 Note that SIGCHLD should be blocked between waitpid and sigsuspend calls,
92 so that we don't miss a signal. If SIGCHLD arrives in between, when it's
93 blocked, the signal becomes pending and sigsuspend immediately
94 notices it and returns.
96 Waiting for events in async mode
97 ================================
99 In async mode, GDB should always be ready to handle both user input
100 and target events, so neither blocking waitpid nor sigsuspend are
101 viable options. Instead, we should asynchronously notify the GDB main
102 event loop whenever there's an unprocessed event from the target. We
103 detect asynchronous target events by handling SIGCHLD signals. To
104 notify the event loop about target events, the self-pipe trick is used
105 --- a pipe is registered as waitable event source in the event loop,
106 the event loop select/poll's on the read end of this pipe (as well on
107 other event sources, e.g., stdin), and the SIGCHLD handler writes a
108 byte to this pipe. This is more portable than relying on
109 pselect/ppoll, since on kernels that lack those syscalls, libc
110 emulates them with select/poll+sigprocmask, and that is racy
111 (a.k.a. plain broken).
113 Obviously, if we fail to notify the event loop if there's a target
114 event, it's bad. OTOH, if we notify the event loop when there's no
115 event from the target, linux_nat_wait will detect that there's no real
116 event to report, and return event of type TARGET_WAITKIND_IGNORE.
117 This is mostly harmless, but it will waste time and is better avoided.
119 The main design point is that every time GDB is outside linux-nat.c,
120 we have a SIGCHLD handler installed that is called when something
121 happens to the target and notifies the GDB event loop. Whenever GDB
122 core decides to handle the event, and calls into linux-nat.c, we
123 process things as in sync mode, except that the we never block in
126 While processing an event, we may end up momentarily blocked in
127 waitpid calls. Those waitpid calls, while blocking, are guarantied to
128 return quickly. E.g., in all-stop mode, before reporting to the core
129 that an LWP hit a breakpoint, all LWPs are stopped by sending them
130 SIGSTOP, and synchronously waiting for the SIGSTOP to be reported.
131 Note that this is different from blocking indefinitely waiting for the
132 next event --- here, we're already handling an event.
137 We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another
138 signal is not entirely significant; we just need for a signal to be delivered,
139 so that we can intercept it. SIGSTOP's advantage is that it can not be
140 blocked. A disadvantage is that it is not a real-time signal, so it can only
141 be queued once; we do not keep track of other sources of SIGSTOP.
143 Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't
144 use them, because they have special behavior when the signal is generated -
145 not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL
146 kills the entire thread group.
148 A delivered SIGSTOP would stop the entire thread group, not just the thread we
149 tkill'd. But we never let the SIGSTOP be delivered; we always intercept and
150 cancel it (by PTRACE_CONT without passing SIGSTOP).
152 We could use a real-time signal instead. This would solve those problems; we
153 could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB.
154 But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH
155 generates it, and there are races with trying to find a signal that is not
159 #define O_LARGEFILE 0
162 /* If the system headers did not provide the constants, hard-code the normal
164 #ifndef PTRACE_EVENT_FORK
166 #define PTRACE_SETOPTIONS 0x4200
167 #define PTRACE_GETEVENTMSG 0x4201
169 /* options set using PTRACE_SETOPTIONS */
170 #define PTRACE_O_TRACESYSGOOD 0x00000001
171 #define PTRACE_O_TRACEFORK 0x00000002
172 #define PTRACE_O_TRACEVFORK 0x00000004
173 #define PTRACE_O_TRACECLONE 0x00000008
174 #define PTRACE_O_TRACEEXEC 0x00000010
175 #define PTRACE_O_TRACEVFORKDONE 0x00000020
176 #define PTRACE_O_TRACEEXIT 0x00000040
178 /* Wait extended result codes for the above trace options. */
179 #define PTRACE_EVENT_FORK 1
180 #define PTRACE_EVENT_VFORK 2
181 #define PTRACE_EVENT_CLONE 3
182 #define PTRACE_EVENT_EXEC 4
183 #define PTRACE_EVENT_VFORK_DONE 5
184 #define PTRACE_EVENT_EXIT 6
186 #endif /* PTRACE_EVENT_FORK */
188 /* Unlike other extended result codes, WSTOPSIG (status) on
189 PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but
190 instead SIGTRAP with bit 7 set. */
191 #define SYSCALL_SIGTRAP (SIGTRAP | 0x80)
193 /* We can't always assume that this flag is available, but all systems
194 with the ptrace event handlers also have __WALL, so it's safe to use
197 #define __WALL 0x40000000 /* Wait for any child. */
200 #ifndef PTRACE_GETSIGINFO
201 # define PTRACE_GETSIGINFO 0x4202
202 # define PTRACE_SETSIGINFO 0x4203
205 /* The single-threaded native GNU/Linux target_ops. We save a pointer for
206 the use of the multi-threaded target. */
207 static struct target_ops
*linux_ops
;
208 static struct target_ops linux_ops_saved
;
210 /* The method to call, if any, when a new thread is attached. */
211 static void (*linux_nat_new_thread
) (ptid_t
);
213 /* The method to call, if any, when the siginfo object needs to be
214 converted between the layout returned by ptrace, and the layout in
215 the architecture of the inferior. */
216 static int (*linux_nat_siginfo_fixup
) (struct siginfo
*,
220 /* The saved to_xfer_partial method, inherited from inf-ptrace.c.
221 Called by our to_xfer_partial. */
222 static LONGEST (*super_xfer_partial
) (struct target_ops
*,
224 const char *, gdb_byte
*,
228 static int debug_linux_nat
;
230 show_debug_linux_nat (struct ui_file
*file
, int from_tty
,
231 struct cmd_list_element
*c
, const char *value
)
233 fprintf_filtered (file
, _("Debugging of GNU/Linux lwp module is %s.\n"),
237 static int debug_linux_nat_async
= 0;
239 show_debug_linux_nat_async (struct ui_file
*file
, int from_tty
,
240 struct cmd_list_element
*c
, const char *value
)
242 fprintf_filtered (file
, _("Debugging of GNU/Linux async lwp module is %s.\n"),
246 static int disable_randomization
= 1;
249 show_disable_randomization (struct ui_file
*file
, int from_tty
,
250 struct cmd_list_element
*c
, const char *value
)
252 #ifdef HAVE_PERSONALITY
253 fprintf_filtered (file
, _("\
254 Disabling randomization of debuggee's virtual address space is %s.\n"),
256 #else /* !HAVE_PERSONALITY */
258 Disabling randomization of debuggee's virtual address space is unsupported on\n\
259 this platform.\n"), file
);
260 #endif /* !HAVE_PERSONALITY */
264 set_disable_randomization (char *args
, int from_tty
, struct cmd_list_element
*c
)
266 #ifndef HAVE_PERSONALITY
268 Disabling randomization of debuggee's virtual address space is unsupported on\n\
270 #endif /* !HAVE_PERSONALITY */
273 static int linux_parent_pid
;
275 struct simple_pid_list
279 struct simple_pid_list
*next
;
281 struct simple_pid_list
*stopped_pids
;
283 /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK
284 can not be used, 1 if it can. */
286 static int linux_supports_tracefork_flag
= -1;
288 /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACESYSGOOD
289 can not be used, 1 if it can. */
291 static int linux_supports_tracesysgood_flag
= -1;
293 /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have
294 PTRACE_O_TRACEVFORKDONE. */
296 static int linux_supports_tracevforkdone_flag
= -1;
298 /* Async mode support */
300 /* Zero if the async mode, although enabled, is masked, which means
301 linux_nat_wait should behave as if async mode was off. */
302 static int linux_nat_async_mask_value
= 1;
304 /* Stores the current used ptrace() options. */
305 static int current_ptrace_options
= 0;
307 /* The read/write ends of the pipe registered as waitable file in the
309 static int linux_nat_event_pipe
[2] = { -1, -1 };
311 /* Flush the event pipe. */
314 async_file_flush (void)
321 ret
= read (linux_nat_event_pipe
[0], &buf
, 1);
323 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
326 /* Put something (anything, doesn't matter what, or how much) in event
327 pipe, so that the select/poll in the event-loop realizes we have
328 something to process. */
331 async_file_mark (void)
335 /* It doesn't really matter what the pipe contains, as long we end
336 up with something in it. Might as well flush the previous
342 ret
= write (linux_nat_event_pipe
[1], "+", 1);
344 while (ret
== -1 && errno
== EINTR
);
346 /* Ignore EAGAIN. If the pipe is full, the event loop will already
347 be awakened anyway. */
350 static void linux_nat_async (void (*callback
)
351 (enum inferior_event_type event_type
, void *context
),
353 static int linux_nat_async_mask (int mask
);
354 static int kill_lwp (int lwpid
, int signo
);
356 static int stop_callback (struct lwp_info
*lp
, void *data
);
358 static void block_child_signals (sigset_t
*prev_mask
);
359 static void restore_child_signals_mask (sigset_t
*prev_mask
);
362 static struct lwp_info
*add_lwp (ptid_t ptid
);
363 static void purge_lwp_list (int pid
);
364 static struct lwp_info
*find_lwp_pid (ptid_t ptid
);
367 /* Trivial list manipulation functions to keep track of a list of
368 new stopped processes. */
370 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
372 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
374 new_pid
->status
= status
;
375 new_pid
->next
= *listp
;
380 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *status
)
382 struct simple_pid_list
**p
;
384 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
385 if ((*p
)->pid
== pid
)
387 struct simple_pid_list
*next
= (*p
)->next
;
388 *status
= (*p
)->status
;
397 linux_record_stopped_pid (int pid
, int status
)
399 add_to_pid_list (&stopped_pids
, pid
, status
);
403 /* A helper function for linux_test_for_tracefork, called after fork (). */
406 linux_tracefork_child (void)
410 ptrace (PTRACE_TRACEME
, 0, 0, 0);
411 kill (getpid (), SIGSTOP
);
416 /* Wrapper function for waitpid which handles EINTR. */
419 my_waitpid (int pid
, int *status
, int flags
)
425 ret
= waitpid (pid
, status
, flags
);
427 while (ret
== -1 && errno
== EINTR
);
432 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events.
434 First, we try to enable fork tracing on ORIGINAL_PID. If this fails,
435 we know that the feature is not available. This may change the tracing
436 options for ORIGINAL_PID, but we'll be setting them shortly anyway.
438 However, if it succeeds, we don't know for sure that the feature is
439 available; old versions of PTRACE_SETOPTIONS ignored unknown options. We
440 create a child process, attach to it, use PTRACE_SETOPTIONS to enable
441 fork tracing, and let it fork. If the process exits, we assume that we
442 can't use TRACEFORK; if we get the fork notification, and we can extract
443 the new child's PID, then we assume that we can. */
446 linux_test_for_tracefork (int original_pid
)
448 int child_pid
, ret
, status
;
452 /* We don't want those ptrace calls to be interrupted. */
453 block_child_signals (&prev_mask
);
455 linux_supports_tracefork_flag
= 0;
456 linux_supports_tracevforkdone_flag
= 0;
458 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACEFORK
);
461 restore_child_signals_mask (&prev_mask
);
467 perror_with_name (("fork"));
470 linux_tracefork_child ();
472 ret
= my_waitpid (child_pid
, &status
, 0);
474 perror_with_name (("waitpid"));
475 else if (ret
!= child_pid
)
476 error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret
);
477 if (! WIFSTOPPED (status
))
478 error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status
);
480 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0, PTRACE_O_TRACEFORK
);
483 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
486 warning (_("linux_test_for_tracefork: failed to kill child"));
487 restore_child_signals_mask (&prev_mask
);
491 ret
= my_waitpid (child_pid
, &status
, 0);
492 if (ret
!= child_pid
)
493 warning (_("linux_test_for_tracefork: failed to wait for killed child"));
494 else if (!WIFSIGNALED (status
))
495 warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from "
496 "killed child"), status
);
498 restore_child_signals_mask (&prev_mask
);
502 /* Check whether PTRACE_O_TRACEVFORKDONE is available. */
503 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0,
504 PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORKDONE
);
505 linux_supports_tracevforkdone_flag
= (ret
== 0);
507 ret
= ptrace (PTRACE_CONT
, child_pid
, 0, 0);
509 warning (_("linux_test_for_tracefork: failed to resume child"));
511 ret
= my_waitpid (child_pid
, &status
, 0);
513 if (ret
== child_pid
&& WIFSTOPPED (status
)
514 && status
>> 16 == PTRACE_EVENT_FORK
)
517 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, 0, &second_pid
);
518 if (ret
== 0 && second_pid
!= 0)
522 linux_supports_tracefork_flag
= 1;
523 my_waitpid (second_pid
, &second_status
, 0);
524 ret
= ptrace (PTRACE_KILL
, second_pid
, 0, 0);
526 warning (_("linux_test_for_tracefork: failed to kill second child"));
527 my_waitpid (second_pid
, &status
, 0);
531 warning (_("linux_test_for_tracefork: unexpected result from waitpid "
532 "(%d, status 0x%x)"), ret
, status
);
534 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
536 warning (_("linux_test_for_tracefork: failed to kill child"));
537 my_waitpid (child_pid
, &status
, 0);
539 restore_child_signals_mask (&prev_mask
);
542 /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls.
544 We try to enable syscall tracing on ORIGINAL_PID. If this fails,
545 we know that the feature is not available. This may change the tracing
546 options for ORIGINAL_PID, but we'll be setting them shortly anyway. */
549 linux_test_for_tracesysgood (int original_pid
)
554 /* We don't want those ptrace calls to be interrupted. */
555 block_child_signals (&prev_mask
);
557 linux_supports_tracesysgood_flag
= 0;
559 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACESYSGOOD
);
563 linux_supports_tracesysgood_flag
= 1;
565 restore_child_signals_mask (&prev_mask
);
568 /* Determine wether we support PTRACE_O_TRACESYSGOOD option available.
569 This function also sets linux_supports_tracesysgood_flag. */
572 linux_supports_tracesysgood (int pid
)
574 if (linux_supports_tracesysgood_flag
== -1)
575 linux_test_for_tracesysgood (pid
);
576 return linux_supports_tracesysgood_flag
;
579 /* Return non-zero iff we have tracefork functionality available.
580 This function also sets linux_supports_tracefork_flag. */
583 linux_supports_tracefork (int pid
)
585 if (linux_supports_tracefork_flag
== -1)
586 linux_test_for_tracefork (pid
);
587 return linux_supports_tracefork_flag
;
591 linux_supports_tracevforkdone (int pid
)
593 if (linux_supports_tracefork_flag
== -1)
594 linux_test_for_tracefork (pid
);
595 return linux_supports_tracevforkdone_flag
;
599 linux_enable_tracesysgood (ptid_t ptid
)
601 int pid
= ptid_get_lwp (ptid
);
604 pid
= ptid_get_pid (ptid
);
606 if (linux_supports_tracesysgood (pid
) == 0)
609 current_ptrace_options
|= PTRACE_O_TRACESYSGOOD
;
611 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
616 linux_enable_event_reporting (ptid_t ptid
)
618 int pid
= ptid_get_lwp (ptid
);
621 pid
= ptid_get_pid (ptid
);
623 if (! linux_supports_tracefork (pid
))
626 current_ptrace_options
|= PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORK
627 | PTRACE_O_TRACEEXEC
| PTRACE_O_TRACECLONE
;
629 if (linux_supports_tracevforkdone (pid
))
630 current_ptrace_options
|= PTRACE_O_TRACEVFORKDONE
;
632 /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
633 read-only process state. */
635 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
639 linux_child_post_attach (int pid
)
641 linux_enable_event_reporting (pid_to_ptid (pid
));
642 check_for_thread_db ();
643 linux_enable_tracesysgood (pid_to_ptid (pid
));
647 linux_child_post_startup_inferior (ptid_t ptid
)
649 linux_enable_event_reporting (ptid
);
650 check_for_thread_db ();
651 linux_enable_tracesysgood (ptid
);
655 linux_child_follow_fork (struct target_ops
*ops
, int follow_child
)
659 int parent_pid
, child_pid
;
661 block_child_signals (&prev_mask
);
663 has_vforked
= (inferior_thread ()->pending_follow
.kind
664 == TARGET_WAITKIND_VFORKED
);
665 parent_pid
= ptid_get_lwp (inferior_ptid
);
667 parent_pid
= ptid_get_pid (inferior_ptid
);
668 child_pid
= PIDGET (inferior_thread ()->pending_follow
.value
.related_pid
);
671 linux_enable_event_reporting (pid_to_ptid (child_pid
));
674 && !non_stop
/* Non-stop always resumes both branches. */
675 && (!target_is_async_p () || sync_execution
)
676 && !(follow_child
|| detach_fork
|| sched_multi
))
678 /* The parent stays blocked inside the vfork syscall until the
679 child execs or exits. If we don't let the child run, then
680 the parent stays blocked. If we're telling the parent to run
681 in the foreground, the user will not be able to ctrl-c to get
682 back the terminal, effectively hanging the debug session. */
683 fprintf_filtered (gdb_stderr
, _("\
684 Can not resume the parent process over vfork in the foreground while \n\
685 holding the child stopped. Try \"set detach-on-fork\" or \
686 \"set schedule-multiple\".\n"));
692 struct lwp_info
*child_lp
= NULL
;
694 /* We're already attached to the parent, by default. */
696 /* Detach new forked process? */
699 /* Before detaching from the child, remove all breakpoints
700 from it. If we forked, then this has already been taken
701 care of by infrun.c. If we vforked however, any
702 breakpoint inserted in the parent is visible in the
703 child, even those added while stopped in a vfork
704 catchpoint. This will remove the breakpoints from the
705 parent also, but they'll be reinserted below. */
708 /* keep breakpoints list in sync. */
709 remove_breakpoints_pid (GET_PID (inferior_ptid
));
712 if (info_verbose
|| debug_linux_nat
)
714 target_terminal_ours ();
715 fprintf_filtered (gdb_stdlog
,
716 "Detaching after fork from child process %d.\n",
720 ptrace (PTRACE_DETACH
, child_pid
, 0, 0);
724 struct inferior
*parent_inf
, *child_inf
;
725 struct cleanup
*old_chain
;
727 /* Add process to GDB's tables. */
728 child_inf
= add_inferior (child_pid
);
730 parent_inf
= current_inferior ();
731 child_inf
->attach_flag
= parent_inf
->attach_flag
;
732 copy_terminal_info (child_inf
, parent_inf
);
734 old_chain
= save_inferior_ptid ();
735 save_current_program_space ();
737 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
738 add_thread (inferior_ptid
);
739 child_lp
= add_lwp (inferior_ptid
);
740 child_lp
->stopped
= 1;
741 child_lp
->resumed
= 1;
743 /* If this is a vfork child, then the address-space is
744 shared with the parent. */
747 child_inf
->pspace
= parent_inf
->pspace
;
748 child_inf
->aspace
= parent_inf
->aspace
;
750 /* The parent will be frozen until the child is done
751 with the shared region. Keep track of the
753 child_inf
->vfork_parent
= parent_inf
;
754 child_inf
->pending_detach
= 0;
755 parent_inf
->vfork_child
= child_inf
;
756 parent_inf
->pending_detach
= 0;
760 child_inf
->aspace
= new_address_space ();
761 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
762 child_inf
->removable
= 1;
763 set_current_program_space (child_inf
->pspace
);
764 clone_program_space (child_inf
->pspace
, parent_inf
->pspace
);
766 /* Let the shared library layer (solib-svr4) learn about
767 this new process, relocate the cloned exec, pull in
768 shared libraries, and install the solib event
769 breakpoint. If a "cloned-VM" event was propagated
770 better throughout the core, this wouldn't be
772 solib_create_inferior_hook (0);
775 /* Let the thread_db layer learn about this new process. */
776 check_for_thread_db ();
778 do_cleanups (old_chain
);
784 struct inferior
*parent_inf
;
786 parent_inf
= current_inferior ();
788 /* If we detached from the child, then we have to be careful
789 to not insert breakpoints in the parent until the child
790 is done with the shared memory region. However, if we're
791 staying attached to the child, then we can and should
792 insert breakpoints, so that we can debug it. A
793 subsequent child exec or exit is enough to know when does
794 the child stops using the parent's address space. */
795 parent_inf
->waiting_for_vfork_done
= detach_fork
;
796 parent_inf
->pspace
->breakpoints_not_allowed
= detach_fork
;
798 lp
= find_lwp_pid (pid_to_ptid (parent_pid
));
799 gdb_assert (linux_supports_tracefork_flag
>= 0);
800 if (linux_supports_tracevforkdone (0))
803 fprintf_unfiltered (gdb_stdlog
,
804 "LCFF: waiting for VFORK_DONE on %d\n",
810 /* We'll handle the VFORK_DONE event like any other
811 event, in target_wait. */
815 /* We can't insert breakpoints until the child has
816 finished with the shared memory region. We need to
817 wait until that happens. Ideal would be to just
819 - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0);
820 - waitpid (parent_pid, &status, __WALL);
821 However, most architectures can't handle a syscall
822 being traced on the way out if it wasn't traced on
825 We might also think to loop, continuing the child
826 until it exits or gets a SIGTRAP. One problem is
827 that the child might call ptrace with PTRACE_TRACEME.
829 There's no simple and reliable way to figure out when
830 the vforked child will be done with its copy of the
831 shared memory. We could step it out of the syscall,
832 two instructions, let it go, and then single-step the
833 parent once. When we have hardware single-step, this
834 would work; with software single-step it could still
835 be made to work but we'd have to be able to insert
836 single-step breakpoints in the child, and we'd have
837 to insert -just- the single-step breakpoint in the
838 parent. Very awkward.
840 In the end, the best we can do is to make sure it
841 runs for a little while. Hopefully it will be out of
842 range of any breakpoints we reinsert. Usually this
843 is only the single-step breakpoint at vfork's return
847 fprintf_unfiltered (gdb_stdlog
,
848 "LCFF: no VFORK_DONE support, sleeping a bit\n");
852 /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event,
853 and leave it pending. The next linux_nat_resume call
854 will notice a pending event, and bypasses actually
855 resuming the inferior. */
857 lp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
861 /* If we're in async mode, need to tell the event loop
862 there's something here to process. */
863 if (target_can_async_p ())
870 struct thread_info
*tp
;
871 struct inferior
*parent_inf
, *child_inf
;
873 struct program_space
*parent_pspace
;
875 if (info_verbose
|| debug_linux_nat
)
877 target_terminal_ours ();
879 fprintf_filtered (gdb_stdlog
, _("\
880 Attaching after process %d vfork to child process %d.\n"),
881 parent_pid
, child_pid
);
883 fprintf_filtered (gdb_stdlog
, _("\
884 Attaching after process %d fork to child process %d.\n"),
885 parent_pid
, child_pid
);
888 /* Add the new inferior first, so that the target_detach below
889 doesn't unpush the target. */
891 child_inf
= add_inferior (child_pid
);
893 parent_inf
= current_inferior ();
894 child_inf
->attach_flag
= parent_inf
->attach_flag
;
895 copy_terminal_info (child_inf
, parent_inf
);
897 parent_pspace
= parent_inf
->pspace
;
899 /* If we're vforking, we want to hold on to the parent until the
900 child exits or execs. At child exec or exit time we can
901 remove the old breakpoints from the parent and detach or
902 resume debugging it. Otherwise, detach the parent now; we'll
903 want to reuse it's program/address spaces, but we can't set
904 them to the child before removing breakpoints from the
905 parent, otherwise, the breakpoints module could decide to
906 remove breakpoints from the wrong process (since they'd be
907 assigned to the same address space). */
911 gdb_assert (child_inf
->vfork_parent
== NULL
);
912 gdb_assert (parent_inf
->vfork_child
== NULL
);
913 child_inf
->vfork_parent
= parent_inf
;
914 child_inf
->pending_detach
= 0;
915 parent_inf
->vfork_child
= child_inf
;
916 parent_inf
->pending_detach
= detach_fork
;
917 parent_inf
->waiting_for_vfork_done
= 0;
919 else if (detach_fork
)
920 target_detach (NULL
, 0);
922 /* Note that the detach above makes PARENT_INF dangling. */
924 /* Add the child thread to the appropriate lists, and switch to
925 this new thread, before cloning the program space, and
926 informing the solib layer about this new process. */
928 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
929 add_thread (inferior_ptid
);
930 lp
= add_lwp (inferior_ptid
);
934 /* If this is a vfork child, then the address-space is shared
935 with the parent. If we detached from the parent, then we can
936 reuse the parent's program/address spaces. */
937 if (has_vforked
|| detach_fork
)
939 child_inf
->pspace
= parent_pspace
;
940 child_inf
->aspace
= child_inf
->pspace
->aspace
;
944 child_inf
->aspace
= new_address_space ();
945 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
946 child_inf
->removable
= 1;
947 set_current_program_space (child_inf
->pspace
);
948 clone_program_space (child_inf
->pspace
, parent_pspace
);
950 /* Let the shared library layer (solib-svr4) learn about
951 this new process, relocate the cloned exec, pull in
952 shared libraries, and install the solib event breakpoint.
953 If a "cloned-VM" event was propagated better throughout
954 the core, this wouldn't be required. */
955 solib_create_inferior_hook (0);
958 /* Let the thread_db layer learn about this new process. */
959 check_for_thread_db ();
962 restore_child_signals_mask (&prev_mask
);
968 linux_child_insert_fork_catchpoint (int pid
)
970 if (! linux_supports_tracefork (pid
))
971 error (_("Your system does not support fork catchpoints."));
975 linux_child_insert_vfork_catchpoint (int pid
)
977 if (!linux_supports_tracefork (pid
))
978 error (_("Your system does not support vfork catchpoints."));
982 linux_child_insert_exec_catchpoint (int pid
)
984 if (!linux_supports_tracefork (pid
))
985 error (_("Your system does not support exec catchpoints."));
989 linux_child_set_syscall_catchpoint (int pid
, int needed
, int any_count
,
990 int table_size
, int *table
)
992 if (! linux_supports_tracesysgood (pid
))
993 error (_("Your system does not support syscall catchpoints."));
994 /* On GNU/Linux, we ignore the arguments. It means that we only
995 enable the syscall catchpoints, but do not disable them.
997 Also, we do not use the `table' information because we do not
998 filter system calls here. We let GDB do the logic for us. */
1002 /* On GNU/Linux there are no real LWP's. The closest thing to LWP's
1003 are processes sharing the same VM space. A multi-threaded process
1004 is basically a group of such processes. However, such a grouping
1005 is almost entirely a user-space issue; the kernel doesn't enforce
1006 such a grouping at all (this might change in the future). In
1007 general, we'll rely on the threads library (i.e. the GNU/Linux
1008 Threads library) to provide such a grouping.
1010 It is perfectly well possible to write a multi-threaded application
1011 without the assistance of a threads library, by using the clone
1012 system call directly. This module should be able to give some
1013 rudimentary support for debugging such applications if developers
1014 specify the CLONE_PTRACE flag in the clone system call, and are
1015 using the Linux kernel 2.4 or above.
1017 Note that there are some peculiarities in GNU/Linux that affect
1020 - In general one should specify the __WCLONE flag to waitpid in
1021 order to make it report events for any of the cloned processes
1022 (and leave it out for the initial process). However, if a cloned
1023 process has exited the exit status is only reported if the
1024 __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
1025 we cannot use it since GDB must work on older systems too.
1027 - When a traced, cloned process exits and is waited for by the
1028 debugger, the kernel reassigns it to the original parent and
1029 keeps it around as a "zombie". Somehow, the GNU/Linux Threads
1030 library doesn't notice this, which leads to the "zombie problem":
1031 When debugged a multi-threaded process that spawns a lot of
1032 threads will run out of processes, even if the threads exit,
1033 because the "zombies" stay around. */
1035 /* List of known LWPs. */
1036 struct lwp_info
*lwp_list
;
1039 /* Original signal mask. */
1040 static sigset_t normal_mask
;
1042 /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in
1043 _initialize_linux_nat. */
1044 static sigset_t suspend_mask
;
1046 /* Signals to block to make that sigsuspend work. */
1047 static sigset_t blocked_mask
;
1049 /* SIGCHLD action. */
1050 struct sigaction sigchld_action
;
1052 /* Block child signals (SIGCHLD and linux threads signals), and store
1053 the previous mask in PREV_MASK. */
1056 block_child_signals (sigset_t
*prev_mask
)
1058 /* Make sure SIGCHLD is blocked. */
1059 if (!sigismember (&blocked_mask
, SIGCHLD
))
1060 sigaddset (&blocked_mask
, SIGCHLD
);
1062 sigprocmask (SIG_BLOCK
, &blocked_mask
, prev_mask
);
1065 /* Restore child signals mask, previously returned by
1066 block_child_signals. */
1069 restore_child_signals_mask (sigset_t
*prev_mask
)
1071 sigprocmask (SIG_SETMASK
, prev_mask
, NULL
);
1075 /* Prototypes for local functions. */
1076 static int stop_wait_callback (struct lwp_info
*lp
, void *data
);
1077 static int linux_thread_alive (ptid_t ptid
);
1078 static char *linux_child_pid_to_exec_file (int pid
);
1079 static int cancel_breakpoint (struct lwp_info
*lp
);
1082 /* Convert wait status STATUS to a string. Used for printing debug
1086 status_to_str (int status
)
1088 static char buf
[64];
1090 if (WIFSTOPPED (status
))
1092 if (WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
1093 snprintf (buf
, sizeof (buf
), "%s (stopped at syscall)",
1094 strsignal (SIGTRAP
));
1096 snprintf (buf
, sizeof (buf
), "%s (stopped)",
1097 strsignal (WSTOPSIG (status
)));
1099 else if (WIFSIGNALED (status
))
1100 snprintf (buf
, sizeof (buf
), "%s (terminated)",
1101 strsignal (WSTOPSIG (status
)));
1103 snprintf (buf
, sizeof (buf
), "%d (exited)", WEXITSTATUS (status
));
1108 /* Initialize the list of LWPs. Note that this module, contrary to
1109 what GDB's generic threads layer does for its thread list,
1110 re-initializes the LWP lists whenever we mourn or detach (which
1111 doesn't involve mourning) the inferior. */
1114 init_lwp_list (void)
1116 struct lwp_info
*lp
, *lpnext
;
1118 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1127 /* Remove all LWPs belong to PID from the lwp list. */
1130 purge_lwp_list (int pid
)
1132 struct lwp_info
*lp
, *lpprev
, *lpnext
;
1136 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1140 if (ptid_get_pid (lp
->ptid
) == pid
)
1143 lwp_list
= lp
->next
;
1145 lpprev
->next
= lp
->next
;
1154 /* Return the number of known LWPs in the tgid given by PID. */
1160 struct lwp_info
*lp
;
1162 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1163 if (ptid_get_pid (lp
->ptid
) == pid
)
1169 /* Add the LWP specified by PID to the list. Return a pointer to the
1170 structure describing the new LWP. The LWP should already be stopped
1171 (with an exception for the very first LWP). */
1173 static struct lwp_info
*
1174 add_lwp (ptid_t ptid
)
1176 struct lwp_info
*lp
;
1178 gdb_assert (is_lwp (ptid
));
1180 lp
= (struct lwp_info
*) xmalloc (sizeof (struct lwp_info
));
1182 memset (lp
, 0, sizeof (struct lwp_info
));
1184 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
1189 lp
->next
= lwp_list
;
1192 if (num_lwps (GET_PID (ptid
)) > 1 && linux_nat_new_thread
!= NULL
)
1193 linux_nat_new_thread (ptid
);
1198 /* Remove the LWP specified by PID from the list. */
1201 delete_lwp (ptid_t ptid
)
1203 struct lwp_info
*lp
, *lpprev
;
1207 for (lp
= lwp_list
; lp
; lpprev
= lp
, lp
= lp
->next
)
1208 if (ptid_equal (lp
->ptid
, ptid
))
1215 lpprev
->next
= lp
->next
;
1217 lwp_list
= lp
->next
;
1222 /* Return a pointer to the structure describing the LWP corresponding
1223 to PID. If no corresponding LWP could be found, return NULL. */
1225 static struct lwp_info
*
1226 find_lwp_pid (ptid_t ptid
)
1228 struct lwp_info
*lp
;
1232 lwp
= GET_LWP (ptid
);
1234 lwp
= GET_PID (ptid
);
1236 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1237 if (lwp
== GET_LWP (lp
->ptid
))
1243 /* Returns true if PTID matches filter FILTER. FILTER can be the wild
1244 card MINUS_ONE_PTID (all ptid match it); can be a ptid representing
1245 a process (ptid_is_pid returns true), in which case, all lwps of
1246 that give process match, lwps of other process do not; or, it can
1247 represent a specific thread, in which case, only that thread will
1248 match true. PTID must represent an LWP, it can never be a wild
1252 ptid_match (ptid_t ptid
, ptid_t filter
)
1254 /* Since both parameters have the same type, prevent easy mistakes
1256 gdb_assert (!ptid_equal (ptid
, minus_one_ptid
)
1257 && !ptid_equal (ptid
, null_ptid
));
1259 if (ptid_equal (filter
, minus_one_ptid
))
1261 if (ptid_is_pid (filter
)
1262 && ptid_get_pid (ptid
) == ptid_get_pid (filter
))
1264 else if (ptid_equal (ptid
, filter
))
1270 /* Call CALLBACK with its second argument set to DATA for every LWP in
1271 the list. If CALLBACK returns 1 for a particular LWP, return a
1272 pointer to the structure describing that LWP immediately.
1273 Otherwise return NULL. */
1276 iterate_over_lwps (ptid_t filter
,
1277 int (*callback
) (struct lwp_info
*, void *),
1280 struct lwp_info
*lp
, *lpnext
;
1282 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1286 if (ptid_match (lp
->ptid
, filter
))
1288 if ((*callback
) (lp
, data
))
1296 /* Update our internal state when changing from one checkpoint to
1297 another indicated by NEW_PTID. We can only switch single-threaded
1298 applications, so we only create one new LWP, and the previous list
1302 linux_nat_switch_fork (ptid_t new_ptid
)
1304 struct lwp_info
*lp
;
1306 purge_lwp_list (GET_PID (inferior_ptid
));
1308 lp
= add_lwp (new_ptid
);
1311 /* This changes the thread's ptid while preserving the gdb thread
1312 num. Also changes the inferior pid, while preserving the
1314 thread_change_ptid (inferior_ptid
, new_ptid
);
1316 /* We've just told GDB core that the thread changed target id, but,
1317 in fact, it really is a different thread, with different register
1319 registers_changed ();
1322 /* Handle the exit of a single thread LP. */
1325 exit_lwp (struct lwp_info
*lp
)
1327 struct thread_info
*th
= find_thread_ptid (lp
->ptid
);
1331 if (print_thread_events
)
1332 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp
->ptid
));
1334 delete_thread (lp
->ptid
);
1337 delete_lwp (lp
->ptid
);
1340 /* Return an lwp's tgid, found in `/proc/PID/status'. */
1343 linux_proc_get_tgid (int lwpid
)
1349 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) lwpid
);
1350 status_file
= fopen (buf
, "r");
1351 if (status_file
!= NULL
)
1353 while (fgets (buf
, sizeof (buf
), status_file
))
1355 if (strncmp (buf
, "Tgid:", 5) == 0)
1357 tgid
= strtoul (buf
+ strlen ("Tgid:"), NULL
, 10);
1362 fclose (status_file
);
1368 /* Detect `T (stopped)' in `/proc/PID/status'.
1369 Other states including `T (tracing stop)' are reported as false. */
1372 pid_is_stopped (pid_t pid
)
1378 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) pid
);
1379 status_file
= fopen (buf
, "r");
1380 if (status_file
!= NULL
)
1384 while (fgets (buf
, sizeof (buf
), status_file
))
1386 if (strncmp (buf
, "State:", 6) == 0)
1392 if (have_state
&& strstr (buf
, "T (stopped)") != NULL
)
1394 fclose (status_file
);
1399 /* Wait for the LWP specified by LP, which we have just attached to.
1400 Returns a wait status for that LWP, to cache. */
1403 linux_nat_post_attach_wait (ptid_t ptid
, int first
, int *cloned
,
1406 pid_t new_pid
, pid
= GET_LWP (ptid
);
1409 if (pid_is_stopped (pid
))
1411 if (debug_linux_nat
)
1412 fprintf_unfiltered (gdb_stdlog
,
1413 "LNPAW: Attaching to a stopped process\n");
1415 /* The process is definitely stopped. It is in a job control
1416 stop, unless the kernel predates the TASK_STOPPED /
1417 TASK_TRACED distinction, in which case it might be in a
1418 ptrace stop. Make sure it is in a ptrace stop; from there we
1419 can kill it, signal it, et cetera.
1421 First make sure there is a pending SIGSTOP. Since we are
1422 already attached, the process can not transition from stopped
1423 to running without a PTRACE_CONT; so we know this signal will
1424 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1425 probably already in the queue (unless this kernel is old
1426 enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP
1427 is not an RT signal, it can only be queued once. */
1428 kill_lwp (pid
, SIGSTOP
);
1430 /* Finally, resume the stopped process. This will deliver the SIGSTOP
1431 (or a higher priority signal, just like normal PTRACE_ATTACH). */
1432 ptrace (PTRACE_CONT
, pid
, 0, 0);
1435 /* Make sure the initial process is stopped. The user-level threads
1436 layer might want to poke around in the inferior, and that won't
1437 work if things haven't stabilized yet. */
1438 new_pid
= my_waitpid (pid
, &status
, 0);
1439 if (new_pid
== -1 && errno
== ECHILD
)
1442 warning (_("%s is a cloned process"), target_pid_to_str (ptid
));
1444 /* Try again with __WCLONE to check cloned processes. */
1445 new_pid
= my_waitpid (pid
, &status
, __WCLONE
);
1449 gdb_assert (pid
== new_pid
);
1451 if (!WIFSTOPPED (status
))
1453 /* The pid we tried to attach has apparently just exited. */
1454 if (debug_linux_nat
)
1455 fprintf_unfiltered (gdb_stdlog
, "LNPAW: Failed to stop %d: %s",
1456 pid
, status_to_str (status
));
1460 if (WSTOPSIG (status
) != SIGSTOP
)
1463 if (debug_linux_nat
)
1464 fprintf_unfiltered (gdb_stdlog
,
1465 "LNPAW: Received %s after attaching\n",
1466 status_to_str (status
));
1472 /* Attach to the LWP specified by PID. Return 0 if successful or -1
1473 if the new LWP could not be attached. */
1476 lin_lwp_attach_lwp (ptid_t ptid
)
1478 struct lwp_info
*lp
;
1481 gdb_assert (is_lwp (ptid
));
1483 block_child_signals (&prev_mask
);
1485 lp
= find_lwp_pid (ptid
);
1487 /* We assume that we're already attached to any LWP that has an id
1488 equal to the overall process id, and to any LWP that is already
1489 in our list of LWPs. If we're not seeing exit events from threads
1490 and we've had PID wraparound since we last tried to stop all threads,
1491 this assumption might be wrong; fortunately, this is very unlikely
1493 if (GET_LWP (ptid
) != GET_PID (ptid
) && lp
== NULL
)
1495 int status
, cloned
= 0, signalled
= 0;
1497 if (ptrace (PTRACE_ATTACH
, GET_LWP (ptid
), 0, 0) < 0)
1499 /* If we fail to attach to the thread, issue a warning,
1500 but continue. One way this can happen is if thread
1501 creation is interrupted; as of Linux kernel 2.6.19, a
1502 bug may place threads in the thread list and then fail
1504 warning (_("Can't attach %s: %s"), target_pid_to_str (ptid
),
1505 safe_strerror (errno
));
1506 restore_child_signals_mask (&prev_mask
);
1510 if (debug_linux_nat
)
1511 fprintf_unfiltered (gdb_stdlog
,
1512 "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
1513 target_pid_to_str (ptid
));
1515 status
= linux_nat_post_attach_wait (ptid
, 0, &cloned
, &signalled
);
1516 if (!WIFSTOPPED (status
))
1519 lp
= add_lwp (ptid
);
1521 lp
->cloned
= cloned
;
1522 lp
->signalled
= signalled
;
1523 if (WSTOPSIG (status
) != SIGSTOP
)
1526 lp
->status
= status
;
1529 target_post_attach (GET_LWP (lp
->ptid
));
1531 if (debug_linux_nat
)
1533 fprintf_unfiltered (gdb_stdlog
,
1534 "LLAL: waitpid %s received %s\n",
1535 target_pid_to_str (ptid
),
1536 status_to_str (status
));
1541 /* We assume that the LWP representing the original process is
1542 already stopped. Mark it as stopped in the data structure
1543 that the GNU/linux ptrace layer uses to keep track of
1544 threads. Note that this won't have already been done since
1545 the main thread will have, we assume, been stopped by an
1546 attach from a different layer. */
1548 lp
= add_lwp (ptid
);
1552 restore_child_signals_mask (&prev_mask
);
1557 linux_nat_create_inferior (struct target_ops
*ops
,
1558 char *exec_file
, char *allargs
, char **env
,
1561 #ifdef HAVE_PERSONALITY
1562 int personality_orig
= 0, personality_set
= 0;
1563 #endif /* HAVE_PERSONALITY */
1565 /* The fork_child mechanism is synchronous and calls target_wait, so
1566 we have to mask the async mode. */
1568 #ifdef HAVE_PERSONALITY
1569 if (disable_randomization
)
1572 personality_orig
= personality (0xffffffff);
1573 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
1575 personality_set
= 1;
1576 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
1578 if (errno
!= 0 || (personality_set
1579 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
1580 warning (_("Error disabling address space randomization: %s"),
1581 safe_strerror (errno
));
1583 #endif /* HAVE_PERSONALITY */
1585 linux_ops
->to_create_inferior (ops
, exec_file
, allargs
, env
, from_tty
);
1587 #ifdef HAVE_PERSONALITY
1588 if (personality_set
)
1591 personality (personality_orig
);
1593 warning (_("Error restoring address space randomization: %s"),
1594 safe_strerror (errno
));
1596 #endif /* HAVE_PERSONALITY */
1600 linux_nat_attach (struct target_ops
*ops
, char *args
, int from_tty
)
1602 struct lwp_info
*lp
;
1606 linux_ops
->to_attach (ops
, args
, from_tty
);
1608 /* The ptrace base target adds the main thread with (pid,0,0)
1609 format. Decorate it with lwp info. */
1610 ptid
= BUILD_LWP (GET_PID (inferior_ptid
), GET_PID (inferior_ptid
));
1611 thread_change_ptid (inferior_ptid
, ptid
);
1613 /* Add the initial process as the first LWP to the list. */
1614 lp
= add_lwp (ptid
);
1616 status
= linux_nat_post_attach_wait (lp
->ptid
, 1, &lp
->cloned
,
1618 if (!WIFSTOPPED (status
))
1620 if (WIFEXITED (status
))
1622 int exit_code
= WEXITSTATUS (status
);
1624 target_terminal_ours ();
1625 target_mourn_inferior ();
1627 error (_("Unable to attach: program exited normally."));
1629 error (_("Unable to attach: program exited with code %d."),
1632 else if (WIFSIGNALED (status
))
1634 enum target_signal signo
;
1636 target_terminal_ours ();
1637 target_mourn_inferior ();
1639 signo
= target_signal_from_host (WTERMSIG (status
));
1640 error (_("Unable to attach: program terminated with signal "
1642 target_signal_to_name (signo
),
1643 target_signal_to_string (signo
));
1646 internal_error (__FILE__
, __LINE__
,
1647 _("unexpected status %d for PID %ld"),
1648 status
, (long) GET_LWP (ptid
));
1653 /* Save the wait status to report later. */
1655 if (debug_linux_nat
)
1656 fprintf_unfiltered (gdb_stdlog
,
1657 "LNA: waitpid %ld, saving status %s\n",
1658 (long) GET_PID (lp
->ptid
), status_to_str (status
));
1660 lp
->status
= status
;
1662 if (target_can_async_p ())
1663 target_async (inferior_event_handler
, 0);
1666 /* Get pending status of LP. */
1668 get_pending_status (struct lwp_info
*lp
, int *status
)
1670 enum target_signal signo
= TARGET_SIGNAL_0
;
1672 /* If we paused threads momentarily, we may have stored pending
1673 events in lp->status or lp->waitstatus (see stop_wait_callback),
1674 and GDB core hasn't seen any signal for those threads.
1675 Otherwise, the last signal reported to the core is found in the
1676 thread object's stop_signal.
1678 There's a corner case that isn't handled here at present. Only
1679 if the thread stopped with a TARGET_WAITKIND_STOPPED does
1680 stop_signal make sense as a real signal to pass to the inferior.
1681 Some catchpoint related events, like
1682 TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set
1683 to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But,
1684 those traps are debug API (ptrace in our case) related and
1685 induced; the inferior wouldn't see them if it wasn't being
1686 traced. Hence, we should never pass them to the inferior, even
1687 when set to pass state. Since this corner case isn't handled by
1688 infrun.c when proceeding with a signal, for consistency, neither
1689 do we handle it here (or elsewhere in the file we check for
1690 signal pass state). Normally SIGTRAP isn't set to pass state, so
1691 this is really a corner case. */
1693 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1694 signo
= TARGET_SIGNAL_0
; /* a pending ptrace event, not a real signal. */
1695 else if (lp
->status
)
1696 signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1697 else if (non_stop
&& !is_executing (lp
->ptid
))
1699 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1700 signo
= tp
->stop_signal
;
1704 struct target_waitstatus last
;
1707 get_last_target_status (&last_ptid
, &last
);
1709 if (GET_LWP (lp
->ptid
) == GET_LWP (last_ptid
))
1711 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1712 signo
= tp
->stop_signal
;
1718 if (signo
== TARGET_SIGNAL_0
)
1720 if (debug_linux_nat
)
1721 fprintf_unfiltered (gdb_stdlog
,
1722 "GPT: lwp %s has no pending signal\n",
1723 target_pid_to_str (lp
->ptid
));
1725 else if (!signal_pass_state (signo
))
1727 if (debug_linux_nat
)
1728 fprintf_unfiltered (gdb_stdlog
, "\
1729 GPT: lwp %s had signal %s, but it is in no pass state\n",
1730 target_pid_to_str (lp
->ptid
),
1731 target_signal_to_string (signo
));
1735 *status
= W_STOPCODE (target_signal_to_host (signo
));
1737 if (debug_linux_nat
)
1738 fprintf_unfiltered (gdb_stdlog
,
1739 "GPT: lwp %s has pending signal %s\n",
1740 target_pid_to_str (lp
->ptid
),
1741 target_signal_to_string (signo
));
1748 detach_callback (struct lwp_info
*lp
, void *data
)
1750 gdb_assert (lp
->status
== 0 || WIFSTOPPED (lp
->status
));
1752 if (debug_linux_nat
&& lp
->status
)
1753 fprintf_unfiltered (gdb_stdlog
, "DC: Pending %s for %s on detach.\n",
1754 strsignal (WSTOPSIG (lp
->status
)),
1755 target_pid_to_str (lp
->ptid
));
1757 /* If there is a pending SIGSTOP, get rid of it. */
1760 if (debug_linux_nat
)
1761 fprintf_unfiltered (gdb_stdlog
,
1762 "DC: Sending SIGCONT to %s\n",
1763 target_pid_to_str (lp
->ptid
));
1765 kill_lwp (GET_LWP (lp
->ptid
), SIGCONT
);
1769 /* We don't actually detach from the LWP that has an id equal to the
1770 overall process id just yet. */
1771 if (GET_LWP (lp
->ptid
) != GET_PID (lp
->ptid
))
1775 /* Pass on any pending signal for this LWP. */
1776 get_pending_status (lp
, &status
);
1779 if (ptrace (PTRACE_DETACH
, GET_LWP (lp
->ptid
), 0,
1780 WSTOPSIG (status
)) < 0)
1781 error (_("Can't detach %s: %s"), target_pid_to_str (lp
->ptid
),
1782 safe_strerror (errno
));
1784 if (debug_linux_nat
)
1785 fprintf_unfiltered (gdb_stdlog
,
1786 "PTRACE_DETACH (%s, %s, 0) (OK)\n",
1787 target_pid_to_str (lp
->ptid
),
1788 strsignal (WSTOPSIG (status
)));
1790 delete_lwp (lp
->ptid
);
1797 linux_nat_detach (struct target_ops
*ops
, char *args
, int from_tty
)
1801 enum target_signal sig
;
1802 struct lwp_info
*main_lwp
;
1804 pid
= GET_PID (inferior_ptid
);
1806 if (target_can_async_p ())
1807 linux_nat_async (NULL
, 0);
1809 /* Stop all threads before detaching. ptrace requires that the
1810 thread is stopped to sucessfully detach. */
1811 iterate_over_lwps (pid_to_ptid (pid
), stop_callback
, NULL
);
1812 /* ... and wait until all of them have reported back that
1813 they're no longer running. */
1814 iterate_over_lwps (pid_to_ptid (pid
), stop_wait_callback
, NULL
);
1816 iterate_over_lwps (pid_to_ptid (pid
), detach_callback
, NULL
);
1818 /* Only the initial process should be left right now. */
1819 gdb_assert (num_lwps (GET_PID (inferior_ptid
)) == 1);
1821 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1823 /* Pass on any pending signal for the last LWP. */
1824 if ((args
== NULL
|| *args
== '\0')
1825 && get_pending_status (main_lwp
, &status
) != -1
1826 && WIFSTOPPED (status
))
1828 /* Put the signal number in ARGS so that inf_ptrace_detach will
1829 pass it along with PTRACE_DETACH. */
1831 sprintf (args
, "%d", (int) WSTOPSIG (status
));
1832 fprintf_unfiltered (gdb_stdlog
,
1833 "LND: Sending signal %s to %s\n",
1835 target_pid_to_str (main_lwp
->ptid
));
1838 delete_lwp (main_lwp
->ptid
);
1840 if (forks_exist_p ())
1842 /* Multi-fork case. The current inferior_ptid is being detached
1843 from, but there are other viable forks to debug. Detach from
1844 the current fork, and context-switch to the first
1846 linux_fork_detach (args
, from_tty
);
1848 if (non_stop
&& target_can_async_p ())
1849 target_async (inferior_event_handler
, 0);
1852 linux_ops
->to_detach (ops
, args
, from_tty
);
1858 resume_callback (struct lwp_info
*lp
, void *data
)
1860 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
1862 if (lp
->stopped
&& inf
->vfork_child
!= NULL
)
1864 if (debug_linux_nat
)
1865 fprintf_unfiltered (gdb_stdlog
,
1866 "RC: Not resuming %s (vfork parent)\n",
1867 target_pid_to_str (lp
->ptid
));
1869 else if (lp
->stopped
&& lp
->status
== 0)
1871 if (debug_linux_nat
)
1872 fprintf_unfiltered (gdb_stdlog
,
1873 "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n",
1874 target_pid_to_str (lp
->ptid
));
1876 linux_ops
->to_resume (linux_ops
,
1877 pid_to_ptid (GET_LWP (lp
->ptid
)),
1878 0, TARGET_SIGNAL_0
);
1879 if (debug_linux_nat
)
1880 fprintf_unfiltered (gdb_stdlog
,
1881 "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
1882 target_pid_to_str (lp
->ptid
));
1885 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1886 lp
->stopped_by_watchpoint
= 0;
1888 else if (lp
->stopped
&& debug_linux_nat
)
1889 fprintf_unfiltered (gdb_stdlog
, "RC: Not resuming sibling %s (has pending)\n",
1890 target_pid_to_str (lp
->ptid
));
1891 else if (debug_linux_nat
)
1892 fprintf_unfiltered (gdb_stdlog
, "RC: Not resuming sibling %s (not stopped)\n",
1893 target_pid_to_str (lp
->ptid
));
1899 resume_clear_callback (struct lwp_info
*lp
, void *data
)
1906 resume_set_callback (struct lwp_info
*lp
, void *data
)
1913 linux_nat_resume (struct target_ops
*ops
,
1914 ptid_t ptid
, int step
, enum target_signal signo
)
1917 struct lwp_info
*lp
;
1920 if (debug_linux_nat
)
1921 fprintf_unfiltered (gdb_stdlog
,
1922 "LLR: Preparing to %s %s, %s, inferior_ptid %s\n",
1923 step
? "step" : "resume",
1924 target_pid_to_str (ptid
),
1925 signo
? strsignal (signo
) : "0",
1926 target_pid_to_str (inferior_ptid
));
1928 block_child_signals (&prev_mask
);
1930 /* A specific PTID means `step only this process id'. */
1931 resume_many
= (ptid_equal (minus_one_ptid
, ptid
)
1932 || ptid_is_pid (ptid
));
1936 /* Mark the lwps we're resuming as resumed. */
1937 iterate_over_lwps (minus_one_ptid
, resume_clear_callback
, NULL
);
1938 iterate_over_lwps (ptid
, resume_set_callback
, NULL
);
1941 iterate_over_lwps (minus_one_ptid
, resume_set_callback
, NULL
);
1943 /* See if it's the current inferior that should be handled
1946 lp
= find_lwp_pid (inferior_ptid
);
1948 lp
= find_lwp_pid (ptid
);
1949 gdb_assert (lp
!= NULL
);
1951 /* Remember if we're stepping. */
1954 /* If we have a pending wait status for this thread, there is no
1955 point in resuming the process. But first make sure that
1956 linux_nat_wait won't preemptively handle the event - we
1957 should never take this short-circuit if we are going to
1958 leave LP running, since we have skipped resuming all the
1959 other threads. This bit of code needs to be synchronized
1960 with linux_nat_wait. */
1962 if (lp
->status
&& WIFSTOPPED (lp
->status
))
1965 struct inferior
*inf
;
1967 inf
= find_inferior_pid (ptid_get_pid (lp
->ptid
));
1969 saved_signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1971 /* Defer to common code if we're gaining control of the
1973 if (inf
->stop_soon
== NO_STOP_QUIETLY
1974 && signal_stop_state (saved_signo
) == 0
1975 && signal_print_state (saved_signo
) == 0
1976 && signal_pass_state (saved_signo
) == 1)
1978 if (debug_linux_nat
)
1979 fprintf_unfiltered (gdb_stdlog
,
1980 "LLR: Not short circuiting for ignored "
1981 "status 0x%x\n", lp
->status
);
1983 /* FIXME: What should we do if we are supposed to continue
1984 this thread with a signal? */
1985 gdb_assert (signo
== TARGET_SIGNAL_0
);
1986 signo
= saved_signo
;
1991 if (lp
->status
|| lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1993 /* FIXME: What should we do if we are supposed to continue
1994 this thread with a signal? */
1995 gdb_assert (signo
== TARGET_SIGNAL_0
);
1997 if (debug_linux_nat
)
1998 fprintf_unfiltered (gdb_stdlog
,
1999 "LLR: Short circuiting for status 0x%x\n",
2002 restore_child_signals_mask (&prev_mask
);
2003 if (target_can_async_p ())
2005 target_async (inferior_event_handler
, 0);
2006 /* Tell the event loop we have something to process. */
2012 /* Mark LWP as not stopped to prevent it from being continued by
2017 iterate_over_lwps (ptid
, resume_callback
, NULL
);
2019 /* Convert to something the lower layer understands. */
2020 ptid
= pid_to_ptid (GET_LWP (lp
->ptid
));
2022 linux_ops
->to_resume (linux_ops
, ptid
, step
, signo
);
2023 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
2024 lp
->stopped_by_watchpoint
= 0;
2026 if (debug_linux_nat
)
2027 fprintf_unfiltered (gdb_stdlog
,
2028 "LLR: %s %s, %s (resume event thread)\n",
2029 step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
2030 target_pid_to_str (ptid
),
2031 signo
? strsignal (signo
) : "0");
2033 restore_child_signals_mask (&prev_mask
);
2034 if (target_can_async_p ())
2035 target_async (inferior_event_handler
, 0);
2038 /* Send a signal to an LWP. */
2041 kill_lwp (int lwpid
, int signo
)
2043 /* Use tkill, if possible, in case we are using nptl threads. If tkill
2044 fails, then we are not using nptl threads and we should be using kill. */
2046 #ifdef HAVE_TKILL_SYSCALL
2048 static int tkill_failed
;
2055 ret
= syscall (__NR_tkill
, lwpid
, signo
);
2056 if (errno
!= ENOSYS
)
2063 return kill (lwpid
, signo
);
2066 /* Handle a GNU/Linux syscall trap wait response. If we see a syscall
2067 event, check if the core is interested in it: if not, ignore the
2068 event, and keep waiting; otherwise, we need to toggle the LWP's
2069 syscall entry/exit status, since the ptrace event itself doesn't
2070 indicate it, and report the trap to higher layers. */
2073 linux_handle_syscall_trap (struct lwp_info
*lp
, int stopping
)
2075 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2076 struct gdbarch
*gdbarch
= target_thread_architecture (lp
->ptid
);
2077 int syscall_number
= (int) gdbarch_get_syscall_number (gdbarch
, lp
->ptid
);
2081 /* If we're stopping threads, there's a SIGSTOP pending, which
2082 makes it so that the LWP reports an immediate syscall return,
2083 followed by the SIGSTOP. Skip seeing that "return" using
2084 PTRACE_CONT directly, and let stop_wait_callback collect the
2085 SIGSTOP. Later when the thread is resumed, a new syscall
2086 entry event. If we didn't do this (and returned 0), we'd
2087 leave a syscall entry pending, and our caller, by using
2088 PTRACE_CONT to collect the SIGSTOP, skips the syscall return
2089 itself. Later, when the user re-resumes this LWP, we'd see
2090 another syscall entry event and we'd mistake it for a return.
2092 If stop_wait_callback didn't force the SIGSTOP out of the LWP
2093 (leaving immediately with LWP->signalled set, without issuing
2094 a PTRACE_CONT), it would still be problematic to leave this
2095 syscall enter pending, as later when the thread is resumed,
2096 it would then see the same syscall exit mentioned above,
2097 followed by the delayed SIGSTOP, while the syscall didn't
2098 actually get to execute. It seems it would be even more
2099 confusing to the user. */
2101 if (debug_linux_nat
)
2102 fprintf_unfiltered (gdb_stdlog
,
2103 "LHST: ignoring syscall %d "
2104 "for LWP %ld (stopping threads), "
2105 "resuming with PTRACE_CONT for SIGSTOP\n",
2107 GET_LWP (lp
->ptid
));
2109 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2110 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2114 if (catch_syscall_enabled ())
2116 /* Always update the entry/return state, even if this particular
2117 syscall isn't interesting to the core now. In async mode,
2118 the user could install a new catchpoint for this syscall
2119 between syscall enter/return, and we'll need to know to
2120 report a syscall return if that happens. */
2121 lp
->syscall_state
= (lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2122 ? TARGET_WAITKIND_SYSCALL_RETURN
2123 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2125 if (catching_syscall_number (syscall_number
))
2127 /* Alright, an event to report. */
2128 ourstatus
->kind
= lp
->syscall_state
;
2129 ourstatus
->value
.syscall_number
= syscall_number
;
2131 if (debug_linux_nat
)
2132 fprintf_unfiltered (gdb_stdlog
,
2133 "LHST: stopping for %s of syscall %d"
2135 lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2136 ? "entry" : "return",
2138 GET_LWP (lp
->ptid
));
2142 if (debug_linux_nat
)
2143 fprintf_unfiltered (gdb_stdlog
,
2144 "LHST: ignoring %s of syscall %d "
2146 lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2147 ? "entry" : "return",
2149 GET_LWP (lp
->ptid
));
2153 /* If we had been syscall tracing, and hence used PT_SYSCALL
2154 before on this LWP, it could happen that the user removes all
2155 syscall catchpoints before we get to process this event.
2156 There are two noteworthy issues here:
2158 - When stopped at a syscall entry event, resuming with
2159 PT_STEP still resumes executing the syscall and reports a
2162 - Only PT_SYSCALL catches syscall enters. If we last
2163 single-stepped this thread, then this event can't be a
2164 syscall enter. If we last single-stepped this thread, this
2165 has to be a syscall exit.
2167 The points above mean that the next resume, be it PT_STEP or
2168 PT_CONTINUE, can not trigger a syscall trace event. */
2169 if (debug_linux_nat
)
2170 fprintf_unfiltered (gdb_stdlog
,
2171 "LHST: caught syscall event with no syscall catchpoints."
2172 " %d for LWP %ld, ignoring\n",
2174 GET_LWP (lp
->ptid
));
2175 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2178 /* The core isn't interested in this event. For efficiency, avoid
2179 stopping all threads only to have the core resume them all again.
2180 Since we're not stopping threads, if we're still syscall tracing
2181 and not stepping, we can't use PTRACE_CONT here, as we'd miss any
2182 subsequent syscall. Simply resume using the inf-ptrace layer,
2183 which knows when to use PT_SYSCALL or PT_CONTINUE. */
2185 /* Note that gdbarch_get_syscall_number may access registers, hence
2187 registers_changed ();
2188 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2189 lp
->step
, TARGET_SIGNAL_0
);
2193 /* Handle a GNU/Linux extended wait response. If we see a clone
2194 event, we need to add the new LWP to our list (and not report the
2195 trap to higher layers). This function returns non-zero if the
2196 event should be ignored and we should wait again. If STOPPING is
2197 true, the new LWP remains stopped, otherwise it is continued. */
2200 linux_handle_extended_wait (struct lwp_info
*lp
, int status
,
2203 int pid
= GET_LWP (lp
->ptid
);
2204 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2205 struct lwp_info
*new_lp
= NULL
;
2206 int event
= status
>> 16;
2208 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
2209 || event
== PTRACE_EVENT_CLONE
)
2211 unsigned long new_pid
;
2214 ptrace (PTRACE_GETEVENTMSG
, pid
, 0, &new_pid
);
2216 /* If we haven't already seen the new PID stop, wait for it now. */
2217 if (! pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
2219 /* The new child has a pending SIGSTOP. We can't affect it until it
2220 hits the SIGSTOP, but we're already attached. */
2221 ret
= my_waitpid (new_pid
, &status
,
2222 (event
== PTRACE_EVENT_CLONE
) ? __WCLONE
: 0);
2224 perror_with_name (_("waiting for new child"));
2225 else if (ret
!= new_pid
)
2226 internal_error (__FILE__
, __LINE__
,
2227 _("wait returned unexpected PID %d"), ret
);
2228 else if (!WIFSTOPPED (status
))
2229 internal_error (__FILE__
, __LINE__
,
2230 _("wait returned unexpected status 0x%x"), status
);
2233 ourstatus
->value
.related_pid
= ptid_build (new_pid
, new_pid
, 0);
2235 if (event
== PTRACE_EVENT_FORK
2236 && linux_fork_checkpointing_p (GET_PID (lp
->ptid
)))
2238 struct fork_info
*fp
;
2240 /* Handle checkpointing by linux-fork.c here as a special
2241 case. We don't want the follow-fork-mode or 'catch fork'
2242 to interfere with this. */
2244 /* This won't actually modify the breakpoint list, but will
2245 physically remove the breakpoints from the child. */
2246 detach_breakpoints (new_pid
);
2248 /* Retain child fork in ptrace (stopped) state. */
2249 fp
= find_fork_pid (new_pid
);
2251 fp
= add_fork (new_pid
);
2253 /* Report as spurious, so that infrun doesn't want to follow
2254 this fork. We're actually doing an infcall in
2256 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
2257 linux_enable_event_reporting (pid_to_ptid (new_pid
));
2259 /* Report the stop to the core. */
2263 if (event
== PTRACE_EVENT_FORK
)
2264 ourstatus
->kind
= TARGET_WAITKIND_FORKED
;
2265 else if (event
== PTRACE_EVENT_VFORK
)
2266 ourstatus
->kind
= TARGET_WAITKIND_VFORKED
;
2269 struct cleanup
*old_chain
;
2271 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2272 new_lp
= add_lwp (BUILD_LWP (new_pid
, GET_PID (lp
->ptid
)));
2274 new_lp
->stopped
= 1;
2276 if (WSTOPSIG (status
) != SIGSTOP
)
2278 /* This can happen if someone starts sending signals to
2279 the new thread before it gets a chance to run, which
2280 have a lower number than SIGSTOP (e.g. SIGUSR1).
2281 This is an unlikely case, and harder to handle for
2282 fork / vfork than for clone, so we do not try - but
2283 we handle it for clone events here. We'll send
2284 the other signal on to the thread below. */
2286 new_lp
->signalled
= 1;
2293 /* Add the new thread to GDB's lists as soon as possible
2296 1) the frontend doesn't have to wait for a stop to
2299 2) we tag it with the correct running state. */
2301 /* If the thread_db layer is active, let it know about
2302 this new thread, and add it to GDB's list. */
2303 if (!thread_db_attach_lwp (new_lp
->ptid
))
2305 /* We're not using thread_db. Add it to GDB's
2307 target_post_attach (GET_LWP (new_lp
->ptid
));
2308 add_thread (new_lp
->ptid
);
2313 set_running (new_lp
->ptid
, 1);
2314 set_executing (new_lp
->ptid
, 1);
2318 /* Note the need to use the low target ops to resume, to
2319 handle resuming with PT_SYSCALL if we have syscall
2325 new_lp
->stopped
= 0;
2326 new_lp
->resumed
= 1;
2329 ? target_signal_from_host (WSTOPSIG (status
))
2332 linux_ops
->to_resume (linux_ops
, pid_to_ptid (new_pid
),
2336 if (debug_linux_nat
)
2337 fprintf_unfiltered (gdb_stdlog
,
2338 "LHEW: Got clone event from LWP %ld, resuming\n",
2339 GET_LWP (lp
->ptid
));
2340 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2341 0, TARGET_SIGNAL_0
);
2349 if (event
== PTRACE_EVENT_EXEC
)
2351 if (debug_linux_nat
)
2352 fprintf_unfiltered (gdb_stdlog
,
2353 "LHEW: Got exec event from LWP %ld\n",
2354 GET_LWP (lp
->ptid
));
2356 ourstatus
->kind
= TARGET_WAITKIND_EXECD
;
2357 ourstatus
->value
.execd_pathname
2358 = xstrdup (linux_child_pid_to_exec_file (pid
));
2363 if (event
== PTRACE_EVENT_VFORK_DONE
)
2365 if (current_inferior ()->waiting_for_vfork_done
)
2367 if (debug_linux_nat
)
2368 fprintf_unfiltered (gdb_stdlog
, "\
2369 LHEW: Got expected PTRACE_EVENT_VFORK_DONE from LWP %ld: stopping\n",
2370 GET_LWP (lp
->ptid
));
2372 ourstatus
->kind
= TARGET_WAITKIND_VFORK_DONE
;
2376 if (debug_linux_nat
)
2377 fprintf_unfiltered (gdb_stdlog
, "\
2378 LHEW: Got PTRACE_EVENT_VFORK_DONE from LWP %ld: resuming\n",
2379 GET_LWP (lp
->ptid
));
2380 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2384 internal_error (__FILE__
, __LINE__
,
2385 _("unknown ptrace event %d"), event
);
2388 /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
2392 wait_lwp (struct lwp_info
*lp
)
2396 int thread_dead
= 0;
2398 gdb_assert (!lp
->stopped
);
2399 gdb_assert (lp
->status
== 0);
2401 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, 0);
2402 if (pid
== -1 && errno
== ECHILD
)
2404 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, __WCLONE
);
2405 if (pid
== -1 && errno
== ECHILD
)
2407 /* The thread has previously exited. We need to delete it
2408 now because, for some vendor 2.4 kernels with NPTL
2409 support backported, there won't be an exit event unless
2410 it is the main thread. 2.6 kernels will report an exit
2411 event for each thread that exits, as expected. */
2413 if (debug_linux_nat
)
2414 fprintf_unfiltered (gdb_stdlog
, "WL: %s vanished.\n",
2415 target_pid_to_str (lp
->ptid
));
2421 gdb_assert (pid
== GET_LWP (lp
->ptid
));
2423 if (debug_linux_nat
)
2425 fprintf_unfiltered (gdb_stdlog
,
2426 "WL: waitpid %s received %s\n",
2427 target_pid_to_str (lp
->ptid
),
2428 status_to_str (status
));
2432 /* Check if the thread has exited. */
2433 if (WIFEXITED (status
) || WIFSIGNALED (status
))
2436 if (debug_linux_nat
)
2437 fprintf_unfiltered (gdb_stdlog
, "WL: %s exited.\n",
2438 target_pid_to_str (lp
->ptid
));
2447 gdb_assert (WIFSTOPPED (status
));
2449 /* Handle GNU/Linux's syscall SIGTRAPs. */
2450 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
2452 /* No longer need the sysgood bit. The ptrace event ends up
2453 recorded in lp->waitstatus if we care for it. We can carry
2454 on handling the event like a regular SIGTRAP from here
2456 status
= W_STOPCODE (SIGTRAP
);
2457 if (linux_handle_syscall_trap (lp
, 1))
2458 return wait_lwp (lp
);
2461 /* Handle GNU/Linux's extended waitstatus for trace events. */
2462 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
2464 if (debug_linux_nat
)
2465 fprintf_unfiltered (gdb_stdlog
,
2466 "WL: Handling extended status 0x%06x\n",
2468 if (linux_handle_extended_wait (lp
, status
, 1))
2469 return wait_lwp (lp
);
2475 /* Save the most recent siginfo for LP. This is currently only called
2476 for SIGTRAP; some ports use the si_addr field for
2477 target_stopped_data_address. In the future, it may also be used to
2478 restore the siginfo of requeued signals. */
2481 save_siginfo (struct lwp_info
*lp
)
2484 ptrace (PTRACE_GETSIGINFO
, GET_LWP (lp
->ptid
),
2485 (PTRACE_TYPE_ARG3
) 0, &lp
->siginfo
);
2488 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
2491 /* Send a SIGSTOP to LP. */
2494 stop_callback (struct lwp_info
*lp
, void *data
)
2496 if (!lp
->stopped
&& !lp
->signalled
)
2500 if (debug_linux_nat
)
2502 fprintf_unfiltered (gdb_stdlog
,
2503 "SC: kill %s **<SIGSTOP>**\n",
2504 target_pid_to_str (lp
->ptid
));
2507 ret
= kill_lwp (GET_LWP (lp
->ptid
), SIGSTOP
);
2508 if (debug_linux_nat
)
2510 fprintf_unfiltered (gdb_stdlog
,
2511 "SC: lwp kill %d %s\n",
2513 errno
? safe_strerror (errno
) : "ERRNO-OK");
2517 gdb_assert (lp
->status
== 0);
2523 /* Return non-zero if LWP PID has a pending SIGINT. */
2526 linux_nat_has_pending_sigint (int pid
)
2528 sigset_t pending
, blocked
, ignored
;
2531 linux_proc_pending_signals (pid
, &pending
, &blocked
, &ignored
);
2533 if (sigismember (&pending
, SIGINT
)
2534 && !sigismember (&ignored
, SIGINT
))
2540 /* Set a flag in LP indicating that we should ignore its next SIGINT. */
2543 set_ignore_sigint (struct lwp_info
*lp
, void *data
)
2545 /* If a thread has a pending SIGINT, consume it; otherwise, set a
2546 flag to consume the next one. */
2547 if (lp
->stopped
&& lp
->status
!= 0 && WIFSTOPPED (lp
->status
)
2548 && WSTOPSIG (lp
->status
) == SIGINT
)
2551 lp
->ignore_sigint
= 1;
2556 /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag.
2557 This function is called after we know the LWP has stopped; if the LWP
2558 stopped before the expected SIGINT was delivered, then it will never have
2559 arrived. Also, if the signal was delivered to a shared queue and consumed
2560 by a different thread, it will never be delivered to this LWP. */
2563 maybe_clear_ignore_sigint (struct lwp_info
*lp
)
2565 if (!lp
->ignore_sigint
)
2568 if (!linux_nat_has_pending_sigint (GET_LWP (lp
->ptid
)))
2570 if (debug_linux_nat
)
2571 fprintf_unfiltered (gdb_stdlog
,
2572 "MCIS: Clearing bogus flag for %s\n",
2573 target_pid_to_str (lp
->ptid
));
2574 lp
->ignore_sigint
= 0;
2578 /* Fetch the possible triggered data watchpoint info and store it in
2581 On some archs, like x86, that use debug registers to set
2582 watchpoints, it's possible that the way to know which watched
2583 address trapped, is to check the register that is used to select
2584 which address to watch. Problem is, between setting the watchpoint
2585 and reading back which data address trapped, the user may change
2586 the set of watchpoints, and, as a consequence, GDB changes the
2587 debug registers in the inferior. To avoid reading back a stale
2588 stopped-data-address when that happens, we cache in LP the fact
2589 that a watchpoint trapped, and the corresponding data address, as
2590 soon as we see LP stop with a SIGTRAP. If GDB changes the debug
2591 registers meanwhile, we have the cached data we can rely on. */
2594 save_sigtrap (struct lwp_info
*lp
)
2596 struct cleanup
*old_chain
;
2598 if (linux_ops
->to_stopped_by_watchpoint
== NULL
)
2600 lp
->stopped_by_watchpoint
= 0;
2604 old_chain
= save_inferior_ptid ();
2605 inferior_ptid
= lp
->ptid
;
2607 lp
->stopped_by_watchpoint
= linux_ops
->to_stopped_by_watchpoint ();
2609 if (lp
->stopped_by_watchpoint
)
2611 if (linux_ops
->to_stopped_data_address
!= NULL
)
2612 lp
->stopped_data_address_p
=
2613 linux_ops
->to_stopped_data_address (¤t_target
,
2614 &lp
->stopped_data_address
);
2616 lp
->stopped_data_address_p
= 0;
2619 do_cleanups (old_chain
);
2622 /* See save_sigtrap. */
2625 linux_nat_stopped_by_watchpoint (void)
2627 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2629 gdb_assert (lp
!= NULL
);
2631 return lp
->stopped_by_watchpoint
;
2635 linux_nat_stopped_data_address (struct target_ops
*ops
, CORE_ADDR
*addr_p
)
2637 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2639 gdb_assert (lp
!= NULL
);
2641 *addr_p
= lp
->stopped_data_address
;
2643 return lp
->stopped_data_address_p
;
2646 /* Wait until LP is stopped. */
2649 stop_wait_callback (struct lwp_info
*lp
, void *data
)
2651 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
2653 /* If this is a vfork parent, bail out, it is not going to report
2654 any SIGSTOP until the vfork is done with. */
2655 if (inf
->vfork_child
!= NULL
)
2662 status
= wait_lwp (lp
);
2666 if (lp
->ignore_sigint
&& WIFSTOPPED (status
)
2667 && WSTOPSIG (status
) == SIGINT
)
2669 lp
->ignore_sigint
= 0;
2672 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2673 if (debug_linux_nat
)
2674 fprintf_unfiltered (gdb_stdlog
,
2675 "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n",
2676 target_pid_to_str (lp
->ptid
),
2677 errno
? safe_strerror (errno
) : "OK");
2679 return stop_wait_callback (lp
, NULL
);
2682 maybe_clear_ignore_sigint (lp
);
2684 if (WSTOPSIG (status
) != SIGSTOP
)
2686 if (WSTOPSIG (status
) == SIGTRAP
)
2688 /* If a LWP other than the LWP that we're reporting an
2689 event for has hit a GDB breakpoint (as opposed to
2690 some random trap signal), then just arrange for it to
2691 hit it again later. We don't keep the SIGTRAP status
2692 and don't forward the SIGTRAP signal to the LWP. We
2693 will handle the current event, eventually we will
2694 resume all LWPs, and this one will get its breakpoint
2697 If we do not do this, then we run the risk that the
2698 user will delete or disable the breakpoint, but the
2699 thread will have already tripped on it. */
2701 /* Save the trap's siginfo in case we need it later. */
2706 /* Now resume this LWP and get the SIGSTOP event. */
2708 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2709 if (debug_linux_nat
)
2711 fprintf_unfiltered (gdb_stdlog
,
2712 "PTRACE_CONT %s, 0, 0 (%s)\n",
2713 target_pid_to_str (lp
->ptid
),
2714 errno
? safe_strerror (errno
) : "OK");
2716 fprintf_unfiltered (gdb_stdlog
,
2717 "SWC: Candidate SIGTRAP event in %s\n",
2718 target_pid_to_str (lp
->ptid
));
2720 /* Hold this event/waitstatus while we check to see if
2721 there are any more (we still want to get that SIGSTOP). */
2722 stop_wait_callback (lp
, NULL
);
2724 /* Hold the SIGTRAP for handling by linux_nat_wait. If
2725 there's another event, throw it back into the
2729 if (debug_linux_nat
)
2730 fprintf_unfiltered (gdb_stdlog
,
2731 "SWC: kill %s, %s\n",
2732 target_pid_to_str (lp
->ptid
),
2733 status_to_str ((int) status
));
2734 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
2737 /* Save the sigtrap event. */
2738 lp
->status
= status
;
2743 /* The thread was stopped with a signal other than
2744 SIGSTOP, and didn't accidentally trip a breakpoint. */
2746 if (debug_linux_nat
)
2748 fprintf_unfiltered (gdb_stdlog
,
2749 "SWC: Pending event %s in %s\n",
2750 status_to_str ((int) status
),
2751 target_pid_to_str (lp
->ptid
));
2753 /* Now resume this LWP and get the SIGSTOP event. */
2755 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2756 if (debug_linux_nat
)
2757 fprintf_unfiltered (gdb_stdlog
,
2758 "SWC: PTRACE_CONT %s, 0, 0 (%s)\n",
2759 target_pid_to_str (lp
->ptid
),
2760 errno
? safe_strerror (errno
) : "OK");
2762 /* Hold this event/waitstatus while we check to see if
2763 there are any more (we still want to get that SIGSTOP). */
2764 stop_wait_callback (lp
, NULL
);
2766 /* If the lp->status field is still empty, use it to
2767 hold this event. If not, then this event must be
2768 returned to the event queue of the LWP. */
2771 if (debug_linux_nat
)
2773 fprintf_unfiltered (gdb_stdlog
,
2774 "SWC: kill %s, %s\n",
2775 target_pid_to_str (lp
->ptid
),
2776 status_to_str ((int) status
));
2778 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (status
));
2781 lp
->status
= status
;
2787 /* We caught the SIGSTOP that we intended to catch, so
2788 there's no SIGSTOP pending. */
2797 /* Return non-zero if LP has a wait status pending. */
2800 status_callback (struct lwp_info
*lp
, void *data
)
2802 /* Only report a pending wait status if we pretend that this has
2803 indeed been resumed. */
2807 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
2809 /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event,
2810 or a a pending process exit. Note that `W_EXITCODE(0,0) ==
2811 0', so a clean process exit can not be stored pending in
2812 lp->status, it is indistinguishable from
2813 no-pending-status. */
2817 if (lp
->status
!= 0)
2823 /* Return non-zero if LP isn't stopped. */
2826 running_callback (struct lwp_info
*lp
, void *data
)
2828 return (lp
->stopped
== 0 || (lp
->status
!= 0 && lp
->resumed
));
2831 /* Count the LWP's that have had events. */
2834 count_events_callback (struct lwp_info
*lp
, void *data
)
2838 gdb_assert (count
!= NULL
);
2840 /* Count only resumed LWPs that have a SIGTRAP event pending. */
2841 if (lp
->status
!= 0 && lp
->resumed
2842 && WIFSTOPPED (lp
->status
) && WSTOPSIG (lp
->status
) == SIGTRAP
)
2848 /* Select the LWP (if any) that is currently being single-stepped. */
2851 select_singlestep_lwp_callback (struct lwp_info
*lp
, void *data
)
2853 if (lp
->step
&& lp
->status
!= 0)
2859 /* Select the Nth LWP that has had a SIGTRAP event. */
2862 select_event_lwp_callback (struct lwp_info
*lp
, void *data
)
2864 int *selector
= data
;
2866 gdb_assert (selector
!= NULL
);
2868 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2869 if (lp
->status
!= 0 && lp
->resumed
2870 && WIFSTOPPED (lp
->status
) && WSTOPSIG (lp
->status
) == SIGTRAP
)
2871 if ((*selector
)-- == 0)
2878 cancel_breakpoint (struct lwp_info
*lp
)
2880 /* Arrange for a breakpoint to be hit again later. We don't keep
2881 the SIGTRAP status and don't forward the SIGTRAP signal to the
2882 LWP. We will handle the current event, eventually we will resume
2883 this LWP, and this breakpoint will trap again.
2885 If we do not do this, then we run the risk that the user will
2886 delete or disable the breakpoint, but the LWP will have already
2889 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
2890 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
2893 pc
= regcache_read_pc (regcache
) - gdbarch_decr_pc_after_break (gdbarch
);
2894 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
2896 if (debug_linux_nat
)
2897 fprintf_unfiltered (gdb_stdlog
,
2898 "CB: Push back breakpoint for %s\n",
2899 target_pid_to_str (lp
->ptid
));
2901 /* Back up the PC if necessary. */
2902 if (gdbarch_decr_pc_after_break (gdbarch
))
2903 regcache_write_pc (regcache
, pc
);
2911 cancel_breakpoints_callback (struct lwp_info
*lp
, void *data
)
2913 struct lwp_info
*event_lp
= data
;
2915 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2919 /* If a LWP other than the LWP that we're reporting an event for has
2920 hit a GDB breakpoint (as opposed to some random trap signal),
2921 then just arrange for it to hit it again later. We don't keep
2922 the SIGTRAP status and don't forward the SIGTRAP signal to the
2923 LWP. We will handle the current event, eventually we will resume
2924 all LWPs, and this one will get its breakpoint trap again.
2926 If we do not do this, then we run the risk that the user will
2927 delete or disable the breakpoint, but the LWP will have already
2930 if (lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
2932 && WIFSTOPPED (lp
->status
) && WSTOPSIG (lp
->status
) == SIGTRAP
2933 && cancel_breakpoint (lp
))
2934 /* Throw away the SIGTRAP. */
2940 /* Select one LWP out of those that have events pending. */
2943 select_event_lwp (ptid_t filter
, struct lwp_info
**orig_lp
, int *status
)
2946 int random_selector
;
2947 struct lwp_info
*event_lp
;
2949 /* Record the wait status for the original LWP. */
2950 (*orig_lp
)->status
= *status
;
2952 /* Give preference to any LWP that is being single-stepped. */
2953 event_lp
= iterate_over_lwps (filter
,
2954 select_singlestep_lwp_callback
, NULL
);
2955 if (event_lp
!= NULL
)
2957 if (debug_linux_nat
)
2958 fprintf_unfiltered (gdb_stdlog
,
2959 "SEL: Select single-step %s\n",
2960 target_pid_to_str (event_lp
->ptid
));
2964 /* No single-stepping LWP. Select one at random, out of those
2965 which have had SIGTRAP events. */
2967 /* First see how many SIGTRAP events we have. */
2968 iterate_over_lwps (filter
, count_events_callback
, &num_events
);
2970 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2971 random_selector
= (int)
2972 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2974 if (debug_linux_nat
&& num_events
> 1)
2975 fprintf_unfiltered (gdb_stdlog
,
2976 "SEL: Found %d SIGTRAP events, selecting #%d\n",
2977 num_events
, random_selector
);
2979 event_lp
= iterate_over_lwps (filter
,
2980 select_event_lwp_callback
,
2984 if (event_lp
!= NULL
)
2986 /* Switch the event LWP. */
2987 *orig_lp
= event_lp
;
2988 *status
= event_lp
->status
;
2991 /* Flush the wait status for the event LWP. */
2992 (*orig_lp
)->status
= 0;
2995 /* Return non-zero if LP has been resumed. */
2998 resumed_callback (struct lwp_info
*lp
, void *data
)
3003 /* Stop an active thread, verify it still exists, then resume it. */
3006 stop_and_resume_callback (struct lwp_info
*lp
, void *data
)
3008 struct lwp_info
*ptr
;
3010 if (!lp
->stopped
&& !lp
->signalled
)
3012 stop_callback (lp
, NULL
);
3013 stop_wait_callback (lp
, NULL
);
3014 /* Resume if the lwp still exists. */
3015 for (ptr
= lwp_list
; ptr
; ptr
= ptr
->next
)
3018 resume_callback (lp
, NULL
);
3019 resume_set_callback (lp
, NULL
);
3025 /* Check if we should go on and pass this event to common code.
3026 Return the affected lwp if we are, or NULL otherwise. */
3027 static struct lwp_info
*
3028 linux_nat_filter_event (int lwpid
, int status
, int options
)
3030 struct lwp_info
*lp
;
3032 lp
= find_lwp_pid (pid_to_ptid (lwpid
));
3034 /* Check for stop events reported by a process we didn't already
3035 know about - anything not already in our LWP list.
3037 If we're expecting to receive stopped processes after
3038 fork, vfork, and clone events, then we'll just add the
3039 new one to our list and go back to waiting for the event
3040 to be reported - the stopped process might be returned
3041 from waitpid before or after the event is. */
3042 if (WIFSTOPPED (status
) && !lp
)
3044 linux_record_stopped_pid (lwpid
, status
);
3048 /* Make sure we don't report an event for the exit of an LWP not in
3049 our list, i.e. not part of the current process. This can happen
3050 if we detach from a program we original forked and then it
3052 if (!WIFSTOPPED (status
) && !lp
)
3055 /* NOTE drow/2003-06-17: This code seems to be meant for debugging
3056 CLONE_PTRACE processes which do not use the thread library -
3057 otherwise we wouldn't find the new LWP this way. That doesn't
3058 currently work, and the following code is currently unreachable
3059 due to the two blocks above. If it's fixed some day, this code
3060 should be broken out into a function so that we can also pick up
3061 LWPs from the new interface. */
3064 lp
= add_lwp (BUILD_LWP (lwpid
, GET_PID (inferior_ptid
)));
3065 if (options
& __WCLONE
)
3068 gdb_assert (WIFSTOPPED (status
)
3069 && WSTOPSIG (status
) == SIGSTOP
);
3072 if (!in_thread_list (inferior_ptid
))
3074 inferior_ptid
= BUILD_LWP (GET_PID (inferior_ptid
),
3075 GET_PID (inferior_ptid
));
3076 add_thread (inferior_ptid
);
3079 add_thread (lp
->ptid
);
3082 /* Handle GNU/Linux's syscall SIGTRAPs. */
3083 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
3085 /* No longer need the sysgood bit. The ptrace event ends up
3086 recorded in lp->waitstatus if we care for it. We can carry
3087 on handling the event like a regular SIGTRAP from here
3089 status
= W_STOPCODE (SIGTRAP
);
3090 if (linux_handle_syscall_trap (lp
, 0))
3094 /* Handle GNU/Linux's extended waitstatus for trace events. */
3095 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
3097 if (debug_linux_nat
)
3098 fprintf_unfiltered (gdb_stdlog
,
3099 "LLW: Handling extended status 0x%06x\n",
3101 if (linux_handle_extended_wait (lp
, status
, 0))
3105 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
)
3107 /* Save the trap's siginfo in case we need it later. */
3113 /* Check if the thread has exited. */
3114 if ((WIFEXITED (status
) || WIFSIGNALED (status
))
3115 && num_lwps (GET_PID (lp
->ptid
)) > 1)
3117 /* If this is the main thread, we must stop all threads and verify
3118 if they are still alive. This is because in the nptl thread model
3119 on Linux 2.4, there is no signal issued for exiting LWPs
3120 other than the main thread. We only get the main thread exit
3121 signal once all child threads have already exited. If we
3122 stop all the threads and use the stop_wait_callback to check
3123 if they have exited we can determine whether this signal
3124 should be ignored or whether it means the end of the debugged
3125 application, regardless of which threading model is being
3127 if (GET_PID (lp
->ptid
) == GET_LWP (lp
->ptid
))
3130 iterate_over_lwps (pid_to_ptid (GET_PID (lp
->ptid
)),
3131 stop_and_resume_callback
, NULL
);
3134 if (debug_linux_nat
)
3135 fprintf_unfiltered (gdb_stdlog
,
3136 "LLW: %s exited.\n",
3137 target_pid_to_str (lp
->ptid
));
3139 if (num_lwps (GET_PID (lp
->ptid
)) > 1)
3141 /* If there is at least one more LWP, then the exit signal
3142 was not the end of the debugged application and should be
3149 /* Check if the current LWP has previously exited. In the nptl
3150 thread model, LWPs other than the main thread do not issue
3151 signals when they exit so we must check whenever the thread has
3152 stopped. A similar check is made in stop_wait_callback(). */
3153 if (num_lwps (GET_PID (lp
->ptid
)) > 1 && !linux_thread_alive (lp
->ptid
))
3155 ptid_t ptid
= pid_to_ptid (GET_PID (lp
->ptid
));
3157 if (debug_linux_nat
)
3158 fprintf_unfiltered (gdb_stdlog
,
3159 "LLW: %s exited.\n",
3160 target_pid_to_str (lp
->ptid
));
3164 /* Make sure there is at least one thread running. */
3165 gdb_assert (iterate_over_lwps (ptid
, running_callback
, NULL
));
3167 /* Discard the event. */
3171 /* Make sure we don't report a SIGSTOP that we sent ourselves in
3172 an attempt to stop an LWP. */
3174 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGSTOP
)
3176 if (debug_linux_nat
)
3177 fprintf_unfiltered (gdb_stdlog
,
3178 "LLW: Delayed SIGSTOP caught for %s.\n",
3179 target_pid_to_str (lp
->ptid
));
3181 /* This is a delayed SIGSTOP. */
3184 registers_changed ();
3186 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3187 lp
->step
, TARGET_SIGNAL_0
);
3188 if (debug_linux_nat
)
3189 fprintf_unfiltered (gdb_stdlog
,
3190 "LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
3192 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3193 target_pid_to_str (lp
->ptid
));
3196 gdb_assert (lp
->resumed
);
3198 /* Discard the event. */
3202 /* Make sure we don't report a SIGINT that we have already displayed
3203 for another thread. */
3204 if (lp
->ignore_sigint
3205 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGINT
)
3207 if (debug_linux_nat
)
3208 fprintf_unfiltered (gdb_stdlog
,
3209 "LLW: Delayed SIGINT caught for %s.\n",
3210 target_pid_to_str (lp
->ptid
));
3212 /* This is a delayed SIGINT. */
3213 lp
->ignore_sigint
= 0;
3215 registers_changed ();
3216 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3217 lp
->step
, TARGET_SIGNAL_0
);
3218 if (debug_linux_nat
)
3219 fprintf_unfiltered (gdb_stdlog
,
3220 "LLW: %s %s, 0, 0 (discard SIGINT)\n",
3222 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3223 target_pid_to_str (lp
->ptid
));
3226 gdb_assert (lp
->resumed
);
3228 /* Discard the event. */
3232 /* An interesting event. */
3234 lp
->status
= status
;
3239 linux_nat_wait_1 (struct target_ops
*ops
,
3240 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3243 static sigset_t prev_mask
;
3244 struct lwp_info
*lp
= NULL
;
3249 if (debug_linux_nat_async
)
3250 fprintf_unfiltered (gdb_stdlog
, "LLW: enter\n");
3252 /* The first time we get here after starting a new inferior, we may
3253 not have added it to the LWP list yet - this is the earliest
3254 moment at which we know its PID. */
3255 if (ptid_is_pid (inferior_ptid
))
3257 /* Upgrade the main thread's ptid. */
3258 thread_change_ptid (inferior_ptid
,
3259 BUILD_LWP (GET_PID (inferior_ptid
),
3260 GET_PID (inferior_ptid
)));
3262 lp
= add_lwp (inferior_ptid
);
3266 /* Make sure SIGCHLD is blocked. */
3267 block_child_signals (&prev_mask
);
3269 if (ptid_equal (ptid
, minus_one_ptid
))
3271 else if (ptid_is_pid (ptid
))
3272 /* A request to wait for a specific tgid. This is not possible
3273 with waitpid, so instead, we wait for any child, and leave
3274 children we're not interested in right now with a pending
3275 status to report later. */
3278 pid
= GET_LWP (ptid
);
3284 /* Make sure there is at least one LWP that has been resumed. */
3285 gdb_assert (iterate_over_lwps (ptid
, resumed_callback
, NULL
));
3287 /* First check if there is a LWP with a wait status pending. */
3290 /* Any LWP that's been resumed will do. */
3291 lp
= iterate_over_lwps (ptid
, status_callback
, NULL
);
3294 if (debug_linux_nat
&& lp
->status
)
3295 fprintf_unfiltered (gdb_stdlog
,
3296 "LLW: Using pending wait status %s for %s.\n",
3297 status_to_str (lp
->status
),
3298 target_pid_to_str (lp
->ptid
));
3301 /* But if we don't find one, we'll have to wait, and check both
3302 cloned and uncloned processes. We start with the cloned
3304 options
= __WCLONE
| WNOHANG
;
3306 else if (is_lwp (ptid
))
3308 if (debug_linux_nat
)
3309 fprintf_unfiltered (gdb_stdlog
,
3310 "LLW: Waiting for specific LWP %s.\n",
3311 target_pid_to_str (ptid
));
3313 /* We have a specific LWP to check. */
3314 lp
= find_lwp_pid (ptid
);
3317 if (debug_linux_nat
&& lp
->status
)
3318 fprintf_unfiltered (gdb_stdlog
,
3319 "LLW: Using pending wait status %s for %s.\n",
3320 status_to_str (lp
->status
),
3321 target_pid_to_str (lp
->ptid
));
3323 /* If we have to wait, take into account whether PID is a cloned
3324 process or not. And we have to convert it to something that
3325 the layer beneath us can understand. */
3326 options
= lp
->cloned
? __WCLONE
: 0;
3327 pid
= GET_LWP (ptid
);
3329 /* We check for lp->waitstatus in addition to lp->status,
3330 because we can have pending process exits recorded in
3331 lp->status and W_EXITCODE(0,0) == 0. We should probably have
3332 an additional lp->status_p flag. */
3333 if (lp
->status
== 0 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3337 if (lp
&& lp
->signalled
)
3339 /* A pending SIGSTOP may interfere with the normal stream of
3340 events. In a typical case where interference is a problem,
3341 we have a SIGSTOP signal pending for LWP A while
3342 single-stepping it, encounter an event in LWP B, and take the
3343 pending SIGSTOP while trying to stop LWP A. After processing
3344 the event in LWP B, LWP A is continued, and we'll never see
3345 the SIGTRAP associated with the last time we were
3346 single-stepping LWP A. */
3348 /* Resume the thread. It should halt immediately returning the
3350 registers_changed ();
3351 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3352 lp
->step
, TARGET_SIGNAL_0
);
3353 if (debug_linux_nat
)
3354 fprintf_unfiltered (gdb_stdlog
,
3355 "LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
3356 lp
->step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3357 target_pid_to_str (lp
->ptid
));
3359 gdb_assert (lp
->resumed
);
3361 /* Catch the pending SIGSTOP. */
3362 status
= lp
->status
;
3365 stop_wait_callback (lp
, NULL
);
3367 /* If the lp->status field isn't empty, we caught another signal
3368 while flushing the SIGSTOP. Return it back to the event
3369 queue of the LWP, as we already have an event to handle. */
3372 if (debug_linux_nat
)
3373 fprintf_unfiltered (gdb_stdlog
,
3374 "LLW: kill %s, %s\n",
3375 target_pid_to_str (lp
->ptid
),
3376 status_to_str (lp
->status
));
3377 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
3380 lp
->status
= status
;
3383 if (!target_can_async_p ())
3385 /* Causes SIGINT to be passed on to the attached process. */
3389 /* Translate generic target_wait options into waitpid options. */
3390 if (target_options
& TARGET_WNOHANG
)
3397 lwpid
= my_waitpid (pid
, &status
, options
);
3401 gdb_assert (pid
== -1 || lwpid
== pid
);
3403 if (debug_linux_nat
)
3405 fprintf_unfiltered (gdb_stdlog
,
3406 "LLW: waitpid %ld received %s\n",
3407 (long) lwpid
, status_to_str (status
));
3410 lp
= linux_nat_filter_event (lwpid
, status
, options
);
3413 && ptid_is_pid (ptid
)
3414 && ptid_get_pid (lp
->ptid
) != ptid_get_pid (ptid
))
3416 if (debug_linux_nat
)
3417 fprintf (stderr
, "LWP %ld got an event %06x, leaving pending.\n",
3418 ptid_get_lwp (lp
->ptid
), status
);
3420 if (WIFSTOPPED (lp
->status
))
3422 if (WSTOPSIG (lp
->status
) != SIGSTOP
)
3424 stop_callback (lp
, NULL
);
3426 /* Resume in order to collect the sigstop. */
3427 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
3429 stop_wait_callback (lp
, NULL
);
3437 else if (WIFEXITED (status
) || WIFSIGNALED (status
))
3439 if (debug_linux_nat
)
3440 fprintf (stderr
, "Process %ld exited while stopping LWPs\n",
3441 ptid_get_lwp (lp
->ptid
));
3443 /* This was the last lwp in the process. Since
3444 events are serialized to GDB core, and we can't
3445 report this one right now, but GDB core and the
3446 other target layers will want to be notified
3447 about the exit code/signal, leave the status
3448 pending for the next time we're able to report
3451 /* Prevent trying to stop this thread again. We'll
3452 never try to resume it because it has a pending
3456 /* Dead LWP's aren't expected to reported a pending
3460 /* Store the pending event in the waitstatus as
3461 well, because W_EXITCODE(0,0) == 0. */
3462 store_waitstatus (&lp
->waitstatus
, lp
->status
);
3476 /* waitpid did return something. Restart over. */
3477 options
|= __WCLONE
;
3485 /* Alternate between checking cloned and uncloned processes. */
3486 options
^= __WCLONE
;
3488 /* And every time we have checked both:
3489 In async mode, return to event loop;
3490 In sync mode, suspend waiting for a SIGCHLD signal. */
3491 if (options
& __WCLONE
)
3493 if (target_options
& TARGET_WNOHANG
)
3495 /* No interesting event. */
3496 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3498 if (debug_linux_nat_async
)
3499 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3501 restore_child_signals_mask (&prev_mask
);
3502 return minus_one_ptid
;
3505 sigsuspend (&suspend_mask
);
3508 else if (target_options
& TARGET_WNOHANG
)
3510 /* No interesting event for PID yet. */
3511 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3513 if (debug_linux_nat_async
)
3514 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3516 restore_child_signals_mask (&prev_mask
);
3517 return minus_one_ptid
;
3520 /* We shouldn't end up here unless we want to try again. */
3521 gdb_assert (lp
== NULL
);
3524 if (!target_can_async_p ())
3525 clear_sigint_trap ();
3529 status
= lp
->status
;
3532 /* Don't report signals that GDB isn't interested in, such as
3533 signals that are neither printed nor stopped upon. Stopping all
3534 threads can be a bit time-consuming so if we want decent
3535 performance with heavily multi-threaded programs, especially when
3536 they're using a high frequency timer, we'd better avoid it if we
3539 if (WIFSTOPPED (status
))
3541 int signo
= target_signal_from_host (WSTOPSIG (status
));
3542 struct inferior
*inf
;
3544 inf
= find_inferior_pid (ptid_get_pid (lp
->ptid
));
3547 /* Defer to common code if we get a signal while
3548 single-stepping, since that may need special care, e.g. to
3549 skip the signal handler, or, if we're gaining control of the
3552 && inf
->stop_soon
== NO_STOP_QUIETLY
3553 && signal_stop_state (signo
) == 0
3554 && signal_print_state (signo
) == 0
3555 && signal_pass_state (signo
) == 1)
3557 /* FIMXE: kettenis/2001-06-06: Should we resume all threads
3558 here? It is not clear we should. GDB may not expect
3559 other threads to run. On the other hand, not resuming
3560 newly attached threads may cause an unwanted delay in
3561 getting them running. */
3562 registers_changed ();
3563 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3565 if (debug_linux_nat
)
3566 fprintf_unfiltered (gdb_stdlog
,
3567 "LLW: %s %s, %s (preempt 'handle')\n",
3569 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3570 target_pid_to_str (lp
->ptid
),
3571 signo
? strsignal (signo
) : "0");
3578 /* Only do the below in all-stop, as we currently use SIGINT
3579 to implement target_stop (see linux_nat_stop) in
3581 if (signo
== TARGET_SIGNAL_INT
&& signal_pass_state (signo
) == 0)
3583 /* If ^C/BREAK is typed at the tty/console, SIGINT gets
3584 forwarded to the entire process group, that is, all LWPs
3585 will receive it - unless they're using CLONE_THREAD to
3586 share signals. Since we only want to report it once, we
3587 mark it as ignored for all LWPs except this one. */
3588 iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid
)),
3589 set_ignore_sigint
, NULL
);
3590 lp
->ignore_sigint
= 0;
3593 maybe_clear_ignore_sigint (lp
);
3597 /* This LWP is stopped now. */
3600 if (debug_linux_nat
)
3601 fprintf_unfiltered (gdb_stdlog
, "LLW: Candidate event %s in %s.\n",
3602 status_to_str (status
), target_pid_to_str (lp
->ptid
));
3606 /* Now stop all other LWP's ... */
3607 iterate_over_lwps (minus_one_ptid
, stop_callback
, NULL
);
3609 /* ... and wait until all of them have reported back that
3610 they're no longer running. */
3611 iterate_over_lwps (minus_one_ptid
, stop_wait_callback
, NULL
);
3613 /* If we're not waiting for a specific LWP, choose an event LWP
3614 from among those that have had events. Giving equal priority
3615 to all LWPs that have had events helps prevent
3618 select_event_lwp (ptid
, &lp
, &status
);
3621 /* Now that we've selected our final event LWP, cancel any
3622 breakpoints in other LWPs that have hit a GDB breakpoint. See
3623 the comment in cancel_breakpoints_callback to find out why. */
3624 iterate_over_lwps (minus_one_ptid
, cancel_breakpoints_callback
, lp
);
3626 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
)
3628 if (debug_linux_nat
)
3629 fprintf_unfiltered (gdb_stdlog
,
3630 "LLW: trap ptid is %s.\n",
3631 target_pid_to_str (lp
->ptid
));
3634 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3636 *ourstatus
= lp
->waitstatus
;
3637 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3640 store_waitstatus (ourstatus
, status
);
3642 if (debug_linux_nat_async
)
3643 fprintf_unfiltered (gdb_stdlog
, "LLW: exit\n");
3645 restore_child_signals_mask (&prev_mask
);
3646 lp
->core
= linux_nat_core_of_thread_1 (lp
->ptid
);
3651 linux_nat_wait (struct target_ops
*ops
,
3652 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3657 if (debug_linux_nat
)
3658 fprintf_unfiltered (gdb_stdlog
, "linux_nat_wait: [%s]\n", target_pid_to_str (ptid
));
3660 /* Flush the async file first. */
3661 if (target_can_async_p ())
3662 async_file_flush ();
3664 event_ptid
= linux_nat_wait_1 (ops
, ptid
, ourstatus
, target_options
);
3666 /* If we requested any event, and something came out, assume there
3667 may be more. If we requested a specific lwp or process, also
3668 assume there may be more. */
3669 if (target_can_async_p ()
3670 && (ourstatus
->kind
!= TARGET_WAITKIND_IGNORE
3671 || !ptid_equal (ptid
, minus_one_ptid
)))
3674 /* Get ready for the next event. */
3675 if (target_can_async_p ())
3676 target_async (inferior_event_handler
, 0);
3682 kill_callback (struct lwp_info
*lp
, void *data
)
3685 ptrace (PTRACE_KILL
, GET_LWP (lp
->ptid
), 0, 0);
3686 if (debug_linux_nat
)
3687 fprintf_unfiltered (gdb_stdlog
,
3688 "KC: PTRACE_KILL %s, 0, 0 (%s)\n",
3689 target_pid_to_str (lp
->ptid
),
3690 errno
? safe_strerror (errno
) : "OK");
3696 kill_wait_callback (struct lwp_info
*lp
, void *data
)
3700 /* We must make sure that there are no pending events (delayed
3701 SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
3702 program doesn't interfere with any following debugging session. */
3704 /* For cloned processes we must check both with __WCLONE and
3705 without, since the exit status of a cloned process isn't reported
3711 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, __WCLONE
);
3712 if (pid
!= (pid_t
) -1)
3714 if (debug_linux_nat
)
3715 fprintf_unfiltered (gdb_stdlog
,
3716 "KWC: wait %s received unknown.\n",
3717 target_pid_to_str (lp
->ptid
));
3718 /* The Linux kernel sometimes fails to kill a thread
3719 completely after PTRACE_KILL; that goes from the stop
3720 point in do_fork out to the one in
3721 get_signal_to_deliever and waits again. So kill it
3723 kill_callback (lp
, NULL
);
3726 while (pid
== GET_LWP (lp
->ptid
));
3728 gdb_assert (pid
== -1 && errno
== ECHILD
);
3733 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, 0);
3734 if (pid
!= (pid_t
) -1)
3736 if (debug_linux_nat
)
3737 fprintf_unfiltered (gdb_stdlog
,
3738 "KWC: wait %s received unk.\n",
3739 target_pid_to_str (lp
->ptid
));
3740 /* See the call to kill_callback above. */
3741 kill_callback (lp
, NULL
);
3744 while (pid
== GET_LWP (lp
->ptid
));
3746 gdb_assert (pid
== -1 && errno
== ECHILD
);
3751 linux_nat_kill (struct target_ops
*ops
)
3753 struct target_waitstatus last
;
3757 /* If we're stopped while forking and we haven't followed yet,
3758 kill the other task. We need to do this first because the
3759 parent will be sleeping if this is a vfork. */
3761 get_last_target_status (&last_ptid
, &last
);
3763 if (last
.kind
== TARGET_WAITKIND_FORKED
3764 || last
.kind
== TARGET_WAITKIND_VFORKED
)
3766 ptrace (PT_KILL
, PIDGET (last
.value
.related_pid
), 0, 0);
3770 if (forks_exist_p ())
3771 linux_fork_killall ();
3774 ptid_t ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
3775 /* Stop all threads before killing them, since ptrace requires
3776 that the thread is stopped to sucessfully PTRACE_KILL. */
3777 iterate_over_lwps (ptid
, stop_callback
, NULL
);
3778 /* ... and wait until all of them have reported back that
3779 they're no longer running. */
3780 iterate_over_lwps (ptid
, stop_wait_callback
, NULL
);
3782 /* Kill all LWP's ... */
3783 iterate_over_lwps (ptid
, kill_callback
, NULL
);
3785 /* ... and wait until we've flushed all events. */
3786 iterate_over_lwps (ptid
, kill_wait_callback
, NULL
);
3789 target_mourn_inferior ();
3793 linux_nat_mourn_inferior (struct target_ops
*ops
)
3795 purge_lwp_list (ptid_get_pid (inferior_ptid
));
3797 if (! forks_exist_p ())
3798 /* Normal case, no other forks available. */
3799 linux_ops
->to_mourn_inferior (ops
);
3801 /* Multi-fork case. The current inferior_ptid has exited, but
3802 there are other viable forks to debug. Delete the exiting
3803 one and context-switch to the first available. */
3804 linux_fork_mourn_inferior ();
3807 /* Convert a native/host siginfo object, into/from the siginfo in the
3808 layout of the inferiors' architecture. */
3811 siginfo_fixup (struct siginfo
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
3815 if (linux_nat_siginfo_fixup
!= NULL
)
3816 done
= linux_nat_siginfo_fixup (siginfo
, inf_siginfo
, direction
);
3818 /* If there was no callback, or the callback didn't do anything,
3819 then just do a straight memcpy. */
3823 memcpy (siginfo
, inf_siginfo
, sizeof (struct siginfo
));
3825 memcpy (inf_siginfo
, siginfo
, sizeof (struct siginfo
));
3830 linux_xfer_siginfo (struct target_ops
*ops
, enum target_object object
,
3831 const char *annex
, gdb_byte
*readbuf
,
3832 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
3835 struct siginfo siginfo
;
3836 gdb_byte inf_siginfo
[sizeof (struct siginfo
)];
3838 gdb_assert (object
== TARGET_OBJECT_SIGNAL_INFO
);
3839 gdb_assert (readbuf
|| writebuf
);
3841 pid
= GET_LWP (inferior_ptid
);
3843 pid
= GET_PID (inferior_ptid
);
3845 if (offset
> sizeof (siginfo
))
3849 ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
3853 /* When GDB is built as a 64-bit application, ptrace writes into
3854 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
3855 inferior with a 64-bit GDB should look the same as debugging it
3856 with a 32-bit GDB, we need to convert it. GDB core always sees
3857 the converted layout, so any read/write will have to be done
3859 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
3861 if (offset
+ len
> sizeof (siginfo
))
3862 len
= sizeof (siginfo
) - offset
;
3864 if (readbuf
!= NULL
)
3865 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
3868 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
3870 /* Convert back to ptrace layout before flushing it out. */
3871 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
3874 ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
3883 linux_nat_xfer_partial (struct target_ops
*ops
, enum target_object object
,
3884 const char *annex
, gdb_byte
*readbuf
,
3885 const gdb_byte
*writebuf
,
3886 ULONGEST offset
, LONGEST len
)
3888 struct cleanup
*old_chain
;
3891 if (object
== TARGET_OBJECT_SIGNAL_INFO
)
3892 return linux_xfer_siginfo (ops
, object
, annex
, readbuf
, writebuf
,
3895 /* The target is connected but no live inferior is selected. Pass
3896 this request down to a lower stratum (e.g., the executable
3898 if (object
== TARGET_OBJECT_MEMORY
&& ptid_equal (inferior_ptid
, null_ptid
))
3901 old_chain
= save_inferior_ptid ();
3903 if (is_lwp (inferior_ptid
))
3904 inferior_ptid
= pid_to_ptid (GET_LWP (inferior_ptid
));
3906 xfer
= linux_ops
->to_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
3909 do_cleanups (old_chain
);
3914 linux_thread_alive (ptid_t ptid
)
3918 gdb_assert (is_lwp (ptid
));
3920 /* Send signal 0 instead of anything ptrace, because ptracing a
3921 running thread errors out claiming that the thread doesn't
3923 err
= kill_lwp (GET_LWP (ptid
), 0);
3925 if (debug_linux_nat
)
3926 fprintf_unfiltered (gdb_stdlog
,
3927 "LLTA: KILL(SIG0) %s (%s)\n",
3928 target_pid_to_str (ptid
),
3929 err
? safe_strerror (err
) : "OK");
3938 linux_nat_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
3940 return linux_thread_alive (ptid
);
3944 linux_nat_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
3946 static char buf
[64];
3949 && (GET_PID (ptid
) != GET_LWP (ptid
)
3950 || num_lwps (GET_PID (ptid
)) > 1))
3952 snprintf (buf
, sizeof (buf
), "LWP %ld", GET_LWP (ptid
));
3956 return normal_pid_to_str (ptid
);
3959 /* Accepts an integer PID; Returns a string representing a file that
3960 can be opened to get the symbols for the child process. */
3963 linux_child_pid_to_exec_file (int pid
)
3965 char *name1
, *name2
;
3967 name1
= xmalloc (MAXPATHLEN
);
3968 name2
= xmalloc (MAXPATHLEN
);
3969 make_cleanup (xfree
, name1
);
3970 make_cleanup (xfree
, name2
);
3971 memset (name2
, 0, MAXPATHLEN
);
3973 sprintf (name1
, "/proc/%d/exe", pid
);
3974 if (readlink (name1
, name2
, MAXPATHLEN
) > 0)
3980 /* Service function for corefiles and info proc. */
3983 read_mapping (FILE *mapfile
,
3988 char *device
, long long *inode
, char *filename
)
3990 int ret
= fscanf (mapfile
, "%llx-%llx %s %llx %s %llx",
3991 addr
, endaddr
, permissions
, offset
, device
, inode
);
3994 if (ret
> 0 && ret
!= EOF
)
3996 /* Eat everything up to EOL for the filename. This will prevent
3997 weird filenames (such as one with embedded whitespace) from
3998 confusing this code. It also makes this code more robust in
3999 respect to annotations the kernel may add after the filename.
4001 Note the filename is used for informational purposes
4003 ret
+= fscanf (mapfile
, "%[^\n]\n", filename
);
4006 return (ret
!= 0 && ret
!= EOF
);
4009 /* Fills the "to_find_memory_regions" target vector. Lists the memory
4010 regions in the inferior for a corefile. */
4013 linux_nat_find_memory_regions (int (*func
) (CORE_ADDR
,
4015 int, int, int, void *), void *obfd
)
4017 int pid
= PIDGET (inferior_ptid
);
4018 char mapsfilename
[MAXPATHLEN
];
4020 long long addr
, endaddr
, size
, offset
, inode
;
4021 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4022 int read
, write
, exec
;
4024 struct cleanup
*cleanup
;
4026 /* Compose the filename for the /proc memory map, and open it. */
4027 sprintf (mapsfilename
, "/proc/%d/maps", pid
);
4028 if ((mapsfile
= fopen (mapsfilename
, "r")) == NULL
)
4029 error (_("Could not open %s."), mapsfilename
);
4030 cleanup
= make_cleanup_fclose (mapsfile
);
4033 fprintf_filtered (gdb_stdout
,
4034 "Reading memory regions from %s\n", mapsfilename
);
4036 /* Now iterate until end-of-file. */
4037 while (read_mapping (mapsfile
, &addr
, &endaddr
, &permissions
[0],
4038 &offset
, &device
[0], &inode
, &filename
[0]))
4040 size
= endaddr
- addr
;
4042 /* Get the segment's permissions. */
4043 read
= (strchr (permissions
, 'r') != 0);
4044 write
= (strchr (permissions
, 'w') != 0);
4045 exec
= (strchr (permissions
, 'x') != 0);
4049 fprintf_filtered (gdb_stdout
,
4050 "Save segment, %lld bytes at %s (%c%c%c)",
4051 size
, paddress (target_gdbarch
, addr
),
4053 write
? 'w' : ' ', exec
? 'x' : ' ');
4055 fprintf_filtered (gdb_stdout
, " for %s", filename
);
4056 fprintf_filtered (gdb_stdout
, "\n");
4059 /* Invoke the callback function to create the corefile
4061 func (addr
, size
, read
, write
, exec
, obfd
);
4063 do_cleanups (cleanup
);
4068 find_signalled_thread (struct thread_info
*info
, void *data
)
4070 if (info
->stop_signal
!= TARGET_SIGNAL_0
4071 && ptid_get_pid (info
->ptid
) == ptid_get_pid (inferior_ptid
))
4077 static enum target_signal
4078 find_stop_signal (void)
4080 struct thread_info
*info
=
4081 iterate_over_threads (find_signalled_thread
, NULL
);
4084 return info
->stop_signal
;
4086 return TARGET_SIGNAL_0
;
4089 /* Records the thread's register state for the corefile note
4093 linux_nat_do_thread_registers (bfd
*obfd
, ptid_t ptid
,
4094 char *note_data
, int *note_size
,
4095 enum target_signal stop_signal
)
4097 gdb_gregset_t gregs
;
4098 gdb_fpregset_t fpregs
;
4099 unsigned long lwp
= ptid_get_lwp (ptid
);
4100 struct gdbarch
*gdbarch
= target_gdbarch
;
4101 struct regcache
*regcache
= get_thread_arch_regcache (ptid
, gdbarch
);
4102 const struct regset
*regset
;
4104 struct cleanup
*old_chain
;
4105 struct core_regset_section
*sect_list
;
4108 old_chain
= save_inferior_ptid ();
4109 inferior_ptid
= ptid
;
4110 target_fetch_registers (regcache
, -1);
4111 do_cleanups (old_chain
);
4113 core_regset_p
= gdbarch_regset_from_core_section_p (gdbarch
);
4114 sect_list
= gdbarch_core_regset_sections (gdbarch
);
4117 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg",
4118 sizeof (gregs
))) != NULL
4119 && regset
->collect_regset
!= NULL
)
4120 regset
->collect_regset (regset
, regcache
, -1,
4121 &gregs
, sizeof (gregs
));
4123 fill_gregset (regcache
, &gregs
, -1);
4125 note_data
= (char *) elfcore_write_prstatus (obfd
,
4129 stop_signal
, &gregs
);
4131 /* The loop below uses the new struct core_regset_section, which stores
4132 the supported section names and sizes for the core file. Note that
4133 note PRSTATUS needs to be treated specially. But the other notes are
4134 structurally the same, so they can benefit from the new struct. */
4135 if (core_regset_p
&& sect_list
!= NULL
)
4136 while (sect_list
->sect_name
!= NULL
)
4138 /* .reg was already handled above. */
4139 if (strcmp (sect_list
->sect_name
, ".reg") == 0)
4144 regset
= gdbarch_regset_from_core_section (gdbarch
,
4145 sect_list
->sect_name
,
4147 gdb_assert (regset
&& regset
->collect_regset
);
4148 gdb_regset
= xmalloc (sect_list
->size
);
4149 regset
->collect_regset (regset
, regcache
, -1,
4150 gdb_regset
, sect_list
->size
);
4151 note_data
= (char *) elfcore_write_register_note (obfd
,
4154 sect_list
->sect_name
,
4161 /* For architectures that does not have the struct core_regset_section
4162 implemented, we use the old method. When all the architectures have
4163 the new support, the code below should be deleted. */
4167 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg2",
4168 sizeof (fpregs
))) != NULL
4169 && regset
->collect_regset
!= NULL
)
4170 regset
->collect_regset (regset
, regcache
, -1,
4171 &fpregs
, sizeof (fpregs
));
4173 fill_fpregset (regcache
, &fpregs
, -1);
4175 note_data
= (char *) elfcore_write_prfpreg (obfd
,
4178 &fpregs
, sizeof (fpregs
));
4184 struct linux_nat_corefile_thread_data
4190 enum target_signal stop_signal
;
4193 /* Called by gdbthread.c once per thread. Records the thread's
4194 register state for the corefile note section. */
4197 linux_nat_corefile_thread_callback (struct lwp_info
*ti
, void *data
)
4199 struct linux_nat_corefile_thread_data
*args
= data
;
4201 args
->note_data
= linux_nat_do_thread_registers (args
->obfd
,
4211 /* Enumerate spufs IDs for process PID. */
4214 iterate_over_spus (int pid
, void (*callback
) (void *, int), void *data
)
4218 struct dirent
*entry
;
4220 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4221 dir
= opendir (path
);
4226 while ((entry
= readdir (dir
)) != NULL
)
4232 fd
= atoi (entry
->d_name
);
4236 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4237 if (stat (path
, &st
) != 0)
4239 if (!S_ISDIR (st
.st_mode
))
4242 if (statfs (path
, &stfs
) != 0)
4244 if (stfs
.f_type
!= SPUFS_MAGIC
)
4247 callback (data
, fd
);
4253 /* Generate corefile notes for SPU contexts. */
4255 struct linux_spu_corefile_data
4263 linux_spu_corefile_callback (void *data
, int fd
)
4265 struct linux_spu_corefile_data
*args
= data
;
4268 static const char *spu_files
[] =
4290 for (i
= 0; i
< sizeof (spu_files
) / sizeof (spu_files
[0]); i
++)
4292 char annex
[32], note_name
[32];
4296 xsnprintf (annex
, sizeof annex
, "%d/%s", fd
, spu_files
[i
]);
4297 spu_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_SPU
,
4301 xsnprintf (note_name
, sizeof note_name
, "SPU/%s", annex
);
4302 args
->note_data
= elfcore_write_note (args
->obfd
, args
->note_data
,
4303 args
->note_size
, note_name
,
4304 NT_SPU
, spu_data
, spu_len
);
4311 linux_spu_make_corefile_notes (bfd
*obfd
, char *note_data
, int *note_size
)
4313 struct linux_spu_corefile_data args
;
4315 args
.note_data
= note_data
;
4316 args
.note_size
= note_size
;
4318 iterate_over_spus (PIDGET (inferior_ptid
),
4319 linux_spu_corefile_callback
, &args
);
4321 return args
.note_data
;
4324 /* Fills the "to_make_corefile_note" target vector. Builds the note
4325 section for a corefile, and returns it in a malloc buffer. */
4328 linux_nat_make_corefile_notes (bfd
*obfd
, int *note_size
)
4330 struct linux_nat_corefile_thread_data thread_args
;
4331 struct cleanup
*old_chain
;
4332 /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */
4333 char fname
[16] = { '\0' };
4334 /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */
4335 char psargs
[80] = { '\0' };
4336 char *note_data
= NULL
;
4337 ptid_t current_ptid
= inferior_ptid
;
4338 ptid_t filter
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
4342 if (get_exec_file (0))
4344 strncpy (fname
, strrchr (get_exec_file (0), '/') + 1, sizeof (fname
));
4345 strncpy (psargs
, get_exec_file (0), sizeof (psargs
));
4346 if (get_inferior_args ())
4349 char *psargs_end
= psargs
+ sizeof (psargs
);
4351 /* linux_elfcore_write_prpsinfo () handles zero unterminated
4353 string_end
= memchr (psargs
, 0, sizeof (psargs
));
4354 if (string_end
!= NULL
)
4356 *string_end
++ = ' ';
4357 strncpy (string_end
, get_inferior_args (),
4358 psargs_end
- string_end
);
4361 note_data
= (char *) elfcore_write_prpsinfo (obfd
,
4363 note_size
, fname
, psargs
);
4366 /* Dump information for threads. */
4367 thread_args
.obfd
= obfd
;
4368 thread_args
.note_data
= note_data
;
4369 thread_args
.note_size
= note_size
;
4370 thread_args
.num_notes
= 0;
4371 thread_args
.stop_signal
= find_stop_signal ();
4372 iterate_over_lwps (filter
, linux_nat_corefile_thread_callback
, &thread_args
);
4373 gdb_assert (thread_args
.num_notes
!= 0);
4374 note_data
= thread_args
.note_data
;
4376 auxv_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_AUXV
,
4380 note_data
= elfcore_write_note (obfd
, note_data
, note_size
,
4381 "CORE", NT_AUXV
, auxv
, auxv_len
);
4385 note_data
= linux_spu_make_corefile_notes (obfd
, note_data
, note_size
);
4387 make_cleanup (xfree
, note_data
);
4391 /* Implement the "info proc" command. */
4394 linux_nat_info_proc_cmd (char *args
, int from_tty
)
4396 /* A long is used for pid instead of an int to avoid a loss of precision
4397 compiler warning from the output of strtoul. */
4398 long pid
= PIDGET (inferior_ptid
);
4401 char buffer
[MAXPATHLEN
];
4402 char fname1
[MAXPATHLEN
], fname2
[MAXPATHLEN
];
4415 /* Break up 'args' into an argv array. */
4416 argv
= gdb_buildargv (args
);
4417 make_cleanup_freeargv (argv
);
4419 while (argv
!= NULL
&& *argv
!= NULL
)
4421 if (isdigit (argv
[0][0]))
4423 pid
= strtoul (argv
[0], NULL
, 10);
4425 else if (strncmp (argv
[0], "mappings", strlen (argv
[0])) == 0)
4429 else if (strcmp (argv
[0], "status") == 0)
4433 else if (strcmp (argv
[0], "stat") == 0)
4437 else if (strcmp (argv
[0], "cmd") == 0)
4441 else if (strncmp (argv
[0], "exe", strlen (argv
[0])) == 0)
4445 else if (strcmp (argv
[0], "cwd") == 0)
4449 else if (strncmp (argv
[0], "all", strlen (argv
[0])) == 0)
4455 /* [...] (future options here) */
4460 error (_("No current process: you must name one."));
4462 sprintf (fname1
, "/proc/%ld", pid
);
4463 if (stat (fname1
, &dummy
) != 0)
4464 error (_("No /proc directory: '%s'"), fname1
);
4466 printf_filtered (_("process %ld\n"), pid
);
4467 if (cmdline_f
|| all
)
4469 sprintf (fname1
, "/proc/%ld/cmdline", pid
);
4470 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4472 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4473 if (fgets (buffer
, sizeof (buffer
), procfile
))
4474 printf_filtered ("cmdline = '%s'\n", buffer
);
4476 warning (_("unable to read '%s'"), fname1
);
4477 do_cleanups (cleanup
);
4480 warning (_("unable to open /proc file '%s'"), fname1
);
4484 sprintf (fname1
, "/proc/%ld/cwd", pid
);
4485 memset (fname2
, 0, sizeof (fname2
));
4486 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4487 printf_filtered ("cwd = '%s'\n", fname2
);
4489 warning (_("unable to read link '%s'"), fname1
);
4493 sprintf (fname1
, "/proc/%ld/exe", pid
);
4494 memset (fname2
, 0, sizeof (fname2
));
4495 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4496 printf_filtered ("exe = '%s'\n", fname2
);
4498 warning (_("unable to read link '%s'"), fname1
);
4500 if (mappings_f
|| all
)
4502 sprintf (fname1
, "/proc/%ld/maps", pid
);
4503 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4505 long long addr
, endaddr
, size
, offset
, inode
;
4506 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4507 struct cleanup
*cleanup
;
4509 cleanup
= make_cleanup_fclose (procfile
);
4510 printf_filtered (_("Mapped address spaces:\n\n"));
4511 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4513 printf_filtered ("\t%10s %10s %10s %10s %7s\n",
4516 " Size", " Offset", "objfile");
4520 printf_filtered (" %18s %18s %10s %10s %7s\n",
4523 " Size", " Offset", "objfile");
4526 while (read_mapping (procfile
, &addr
, &endaddr
, &permissions
[0],
4527 &offset
, &device
[0], &inode
, &filename
[0]))
4529 size
= endaddr
- addr
;
4531 /* FIXME: carlton/2003-08-27: Maybe the printf_filtered
4532 calls here (and possibly above) should be abstracted
4533 out into their own functions? Andrew suggests using
4534 a generic local_address_string instead to print out
4535 the addresses; that makes sense to me, too. */
4537 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4539 printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
4540 (unsigned long) addr
, /* FIXME: pr_addr */
4541 (unsigned long) endaddr
,
4543 (unsigned int) offset
,
4544 filename
[0] ? filename
: "");
4548 printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
4549 (unsigned long) addr
, /* FIXME: pr_addr */
4550 (unsigned long) endaddr
,
4552 (unsigned int) offset
,
4553 filename
[0] ? filename
: "");
4557 do_cleanups (cleanup
);
4560 warning (_("unable to open /proc file '%s'"), fname1
);
4562 if (status_f
|| all
)
4564 sprintf (fname1
, "/proc/%ld/status", pid
);
4565 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4567 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4568 while (fgets (buffer
, sizeof (buffer
), procfile
) != NULL
)
4569 puts_filtered (buffer
);
4570 do_cleanups (cleanup
);
4573 warning (_("unable to open /proc file '%s'"), fname1
);
4577 sprintf (fname1
, "/proc/%ld/stat", pid
);
4578 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4583 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4585 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4586 printf_filtered (_("Process: %d\n"), itmp
);
4587 if (fscanf (procfile
, "(%[^)]) ", &buffer
[0]) > 0)
4588 printf_filtered (_("Exec file: %s\n"), buffer
);
4589 if (fscanf (procfile
, "%c ", &ctmp
) > 0)
4590 printf_filtered (_("State: %c\n"), ctmp
);
4591 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4592 printf_filtered (_("Parent process: %d\n"), itmp
);
4593 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4594 printf_filtered (_("Process group: %d\n"), itmp
);
4595 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4596 printf_filtered (_("Session id: %d\n"), itmp
);
4597 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4598 printf_filtered (_("TTY: %d\n"), itmp
);
4599 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4600 printf_filtered (_("TTY owner process group: %d\n"), itmp
);
4601 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4602 printf_filtered (_("Flags: 0x%lx\n"), ltmp
);
4603 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4604 printf_filtered (_("Minor faults (no memory page): %lu\n"),
4605 (unsigned long) ltmp
);
4606 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4607 printf_filtered (_("Minor faults, children: %lu\n"),
4608 (unsigned long) ltmp
);
4609 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4610 printf_filtered (_("Major faults (memory page faults): %lu\n"),
4611 (unsigned long) ltmp
);
4612 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4613 printf_filtered (_("Major faults, children: %lu\n"),
4614 (unsigned long) ltmp
);
4615 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4616 printf_filtered (_("utime: %ld\n"), ltmp
);
4617 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4618 printf_filtered (_("stime: %ld\n"), ltmp
);
4619 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4620 printf_filtered (_("utime, children: %ld\n"), ltmp
);
4621 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4622 printf_filtered (_("stime, children: %ld\n"), ltmp
);
4623 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4624 printf_filtered (_("jiffies remaining in current time slice: %ld\n"),
4626 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4627 printf_filtered (_("'nice' value: %ld\n"), ltmp
);
4628 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4629 printf_filtered (_("jiffies until next timeout: %lu\n"),
4630 (unsigned long) ltmp
);
4631 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4632 printf_filtered (_("jiffies until next SIGALRM: %lu\n"),
4633 (unsigned long) ltmp
);
4634 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4635 printf_filtered (_("start time (jiffies since system boot): %ld\n"),
4637 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4638 printf_filtered (_("Virtual memory size: %lu\n"),
4639 (unsigned long) ltmp
);
4640 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4641 printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp
);
4642 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4643 printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp
);
4644 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4645 printf_filtered (_("Start of text: 0x%lx\n"), ltmp
);
4646 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4647 printf_filtered (_("End of text: 0x%lx\n"), ltmp
);
4648 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4649 printf_filtered (_("Start of stack: 0x%lx\n"), ltmp
);
4650 #if 0 /* Don't know how architecture-dependent the rest is...
4651 Anyway the signal bitmap info is available from "status". */
4652 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4653 printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp
);
4654 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4655 printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp
);
4656 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4657 printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp
);
4658 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4659 printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp
);
4660 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4661 printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp
);
4662 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4663 printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp
);
4664 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4665 printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp
);
4667 do_cleanups (cleanup
);
4670 warning (_("unable to open /proc file '%s'"), fname1
);
4674 /* Implement the to_xfer_partial interface for memory reads using the /proc
4675 filesystem. Because we can use a single read() call for /proc, this
4676 can be much more efficient than banging away at PTRACE_PEEKTEXT,
4677 but it doesn't support writes. */
4680 linux_proc_xfer_partial (struct target_ops
*ops
, enum target_object object
,
4681 const char *annex
, gdb_byte
*readbuf
,
4682 const gdb_byte
*writebuf
,
4683 ULONGEST offset
, LONGEST len
)
4689 if (object
!= TARGET_OBJECT_MEMORY
|| !readbuf
)
4692 /* Don't bother for one word. */
4693 if (len
< 3 * sizeof (long))
4696 /* We could keep this file open and cache it - possibly one per
4697 thread. That requires some juggling, but is even faster. */
4698 sprintf (filename
, "/proc/%d/mem", PIDGET (inferior_ptid
));
4699 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4703 /* If pread64 is available, use it. It's faster if the kernel
4704 supports it (only one syscall), and it's 64-bit safe even on
4705 32-bit platforms (for instance, SPARC debugging a SPARC64
4708 if (pread64 (fd
, readbuf
, len
, offset
) != len
)
4710 if (lseek (fd
, offset
, SEEK_SET
) == -1 || read (fd
, readbuf
, len
) != len
)
4721 /* Enumerate spufs IDs for process PID. */
4723 spu_enumerate_spu_ids (int pid
, gdb_byte
*buf
, ULONGEST offset
, LONGEST len
)
4725 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch
);
4727 LONGEST written
= 0;
4730 struct dirent
*entry
;
4732 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4733 dir
= opendir (path
);
4738 while ((entry
= readdir (dir
)) != NULL
)
4744 fd
= atoi (entry
->d_name
);
4748 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4749 if (stat (path
, &st
) != 0)
4751 if (!S_ISDIR (st
.st_mode
))
4754 if (statfs (path
, &stfs
) != 0)
4756 if (stfs
.f_type
!= SPUFS_MAGIC
)
4759 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
4761 store_unsigned_integer (buf
+ pos
- offset
, 4, byte_order
, fd
);
4771 /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU
4772 object type, using the /proc file system. */
4774 linux_proc_xfer_spu (struct target_ops
*ops
, enum target_object object
,
4775 const char *annex
, gdb_byte
*readbuf
,
4776 const gdb_byte
*writebuf
,
4777 ULONGEST offset
, LONGEST len
)
4782 int pid
= PIDGET (inferior_ptid
);
4789 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
4792 xsnprintf (buf
, sizeof buf
, "/proc/%d/fd/%s", pid
, annex
);
4793 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
4798 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4805 ret
= write (fd
, writebuf
, (size_t) len
);
4807 ret
= read (fd
, readbuf
, (size_t) len
);
4814 /* Parse LINE as a signal set and add its set bits to SIGS. */
4817 add_line_to_sigset (const char *line
, sigset_t
*sigs
)
4819 int len
= strlen (line
) - 1;
4823 if (line
[len
] != '\n')
4824 error (_("Could not parse signal set: %s"), line
);
4832 if (*p
>= '0' && *p
<= '9')
4834 else if (*p
>= 'a' && *p
<= 'f')
4835 digit
= *p
- 'a' + 10;
4837 error (_("Could not parse signal set: %s"), line
);
4842 sigaddset (sigs
, signum
+ 1);
4844 sigaddset (sigs
, signum
+ 2);
4846 sigaddset (sigs
, signum
+ 3);
4848 sigaddset (sigs
, signum
+ 4);
4854 /* Find process PID's pending signals from /proc/pid/status and set
4858 linux_proc_pending_signals (int pid
, sigset_t
*pending
, sigset_t
*blocked
, sigset_t
*ignored
)
4861 char buffer
[MAXPATHLEN
], fname
[MAXPATHLEN
];
4863 struct cleanup
*cleanup
;
4865 sigemptyset (pending
);
4866 sigemptyset (blocked
);
4867 sigemptyset (ignored
);
4868 sprintf (fname
, "/proc/%d/status", pid
);
4869 procfile
= fopen (fname
, "r");
4870 if (procfile
== NULL
)
4871 error (_("Could not open %s"), fname
);
4872 cleanup
= make_cleanup_fclose (procfile
);
4874 while (fgets (buffer
, MAXPATHLEN
, procfile
) != NULL
)
4876 /* Normal queued signals are on the SigPnd line in the status
4877 file. However, 2.6 kernels also have a "shared" pending
4878 queue for delivering signals to a thread group, so check for
4881 Unfortunately some Red Hat kernels include the shared pending
4882 queue but not the ShdPnd status field. */
4884 if (strncmp (buffer
, "SigPnd:\t", 8) == 0)
4885 add_line_to_sigset (buffer
+ 8, pending
);
4886 else if (strncmp (buffer
, "ShdPnd:\t", 8) == 0)
4887 add_line_to_sigset (buffer
+ 8, pending
);
4888 else if (strncmp (buffer
, "SigBlk:\t", 8) == 0)
4889 add_line_to_sigset (buffer
+ 8, blocked
);
4890 else if (strncmp (buffer
, "SigIgn:\t", 8) == 0)
4891 add_line_to_sigset (buffer
+ 8, ignored
);
4894 do_cleanups (cleanup
);
4898 linux_nat_xfer_osdata (struct target_ops
*ops
, enum target_object object
,
4899 const char *annex
, gdb_byte
*readbuf
,
4900 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
4902 /* We make the process list snapshot when the object starts to be
4904 static const char *buf
;
4905 static LONGEST len_avail
= -1;
4906 static struct obstack obstack
;
4910 gdb_assert (object
== TARGET_OBJECT_OSDATA
);
4912 if (strcmp (annex
, "processes") != 0)
4915 gdb_assert (readbuf
&& !writebuf
);
4919 if (len_avail
!= -1 && len_avail
!= 0)
4920 obstack_free (&obstack
, NULL
);
4923 obstack_init (&obstack
);
4924 obstack_grow_str (&obstack
, "<osdata type=\"processes\">\n");
4926 dirp
= opendir ("/proc");
4930 while ((dp
= readdir (dirp
)) != NULL
)
4932 struct stat statbuf
;
4933 char procentry
[sizeof ("/proc/4294967295")];
4935 if (!isdigit (dp
->d_name
[0])
4936 || NAMELEN (dp
) > sizeof ("4294967295") - 1)
4939 sprintf (procentry
, "/proc/%s", dp
->d_name
);
4940 if (stat (procentry
, &statbuf
) == 0
4941 && S_ISDIR (statbuf
.st_mode
))
4945 char cmd
[MAXPATHLEN
+ 1];
4946 struct passwd
*entry
;
4948 pathname
= xstrprintf ("/proc/%s/cmdline", dp
->d_name
);
4949 entry
= getpwuid (statbuf
.st_uid
);
4951 if ((f
= fopen (pathname
, "r")) != NULL
)
4953 size_t len
= fread (cmd
, 1, sizeof (cmd
) - 1, f
);
4957 for (i
= 0; i
< len
; i
++)
4962 obstack_xml_printf (
4965 "<column name=\"pid\">%s</column>"
4966 "<column name=\"user\">%s</column>"
4967 "<column name=\"command\">%s</column>"
4970 entry
? entry
->pw_name
: "?",
4983 obstack_grow_str0 (&obstack
, "</osdata>\n");
4984 buf
= obstack_finish (&obstack
);
4985 len_avail
= strlen (buf
);
4988 if (offset
>= len_avail
)
4990 /* Done. Get rid of the obstack. */
4991 obstack_free (&obstack
, NULL
);
4997 if (len
> len_avail
- offset
)
4998 len
= len_avail
- offset
;
4999 memcpy (readbuf
, buf
+ offset
, len
);
5005 linux_xfer_partial (struct target_ops
*ops
, enum target_object object
,
5006 const char *annex
, gdb_byte
*readbuf
,
5007 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
5011 if (object
== TARGET_OBJECT_AUXV
)
5012 return procfs_xfer_auxv (ops
, object
, annex
, readbuf
, writebuf
,
5015 if (object
== TARGET_OBJECT_OSDATA
)
5016 return linux_nat_xfer_osdata (ops
, object
, annex
, readbuf
, writebuf
,
5019 if (object
== TARGET_OBJECT_SPU
)
5020 return linux_proc_xfer_spu (ops
, object
, annex
, readbuf
, writebuf
,
5023 /* GDB calculates all the addresses in possibly larget width of the address.
5024 Address width needs to be masked before its final use - either by
5025 linux_proc_xfer_partial or inf_ptrace_xfer_partial.
5027 Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */
5029 if (object
== TARGET_OBJECT_MEMORY
)
5031 int addr_bit
= gdbarch_addr_bit (target_gdbarch
);
5033 if (addr_bit
< (sizeof (ULONGEST
) * HOST_CHAR_BIT
))
5034 offset
&= ((ULONGEST
) 1 << addr_bit
) - 1;
5037 xfer
= linux_proc_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5042 return super_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5046 /* Create a prototype generic GNU/Linux target. The client can override
5047 it with local methods. */
5050 linux_target_install_ops (struct target_ops
*t
)
5052 t
->to_insert_fork_catchpoint
= linux_child_insert_fork_catchpoint
;
5053 t
->to_insert_vfork_catchpoint
= linux_child_insert_vfork_catchpoint
;
5054 t
->to_insert_exec_catchpoint
= linux_child_insert_exec_catchpoint
;
5055 t
->to_set_syscall_catchpoint
= linux_child_set_syscall_catchpoint
;
5056 t
->to_pid_to_exec_file
= linux_child_pid_to_exec_file
;
5057 t
->to_post_startup_inferior
= linux_child_post_startup_inferior
;
5058 t
->to_post_attach
= linux_child_post_attach
;
5059 t
->to_follow_fork
= linux_child_follow_fork
;
5060 t
->to_find_memory_regions
= linux_nat_find_memory_regions
;
5061 t
->to_make_corefile_notes
= linux_nat_make_corefile_notes
;
5063 super_xfer_partial
= t
->to_xfer_partial
;
5064 t
->to_xfer_partial
= linux_xfer_partial
;
5070 struct target_ops
*t
;
5072 t
= inf_ptrace_target ();
5073 linux_target_install_ops (t
);
5079 linux_trad_target (CORE_ADDR (*register_u_offset
)(struct gdbarch
*, int, int))
5081 struct target_ops
*t
;
5083 t
= inf_ptrace_trad_target (register_u_offset
);
5084 linux_target_install_ops (t
);
5089 /* target_is_async_p implementation. */
5092 linux_nat_is_async_p (void)
5094 /* NOTE: palves 2008-03-21: We're only async when the user requests
5095 it explicitly with the "set target-async" command.
5096 Someday, linux will always be async. */
5097 if (!target_async_permitted
)
5100 /* See target.h/target_async_mask. */
5101 return linux_nat_async_mask_value
;
5104 /* target_can_async_p implementation. */
5107 linux_nat_can_async_p (void)
5109 /* NOTE: palves 2008-03-21: We're only async when the user requests
5110 it explicitly with the "set target-async" command.
5111 Someday, linux will always be async. */
5112 if (!target_async_permitted
)
5115 /* See target.h/target_async_mask. */
5116 return linux_nat_async_mask_value
;
5120 linux_nat_supports_non_stop (void)
5125 /* True if we want to support multi-process. To be removed when GDB
5126 supports multi-exec. */
5128 int linux_multi_process
= 1;
5131 linux_nat_supports_multi_process (void)
5133 return linux_multi_process
;
5136 /* target_async_mask implementation. */
5139 linux_nat_async_mask (int new_mask
)
5141 int curr_mask
= linux_nat_async_mask_value
;
5143 if (curr_mask
!= new_mask
)
5147 linux_nat_async (NULL
, 0);
5148 linux_nat_async_mask_value
= new_mask
;
5152 linux_nat_async_mask_value
= new_mask
;
5154 /* If we're going out of async-mask in all-stop, then the
5155 inferior is stopped. The next resume will call
5156 target_async. In non-stop, the target event source
5157 should be always registered in the event loop. Do so
5160 linux_nat_async (inferior_event_handler
, 0);
5167 static int async_terminal_is_ours
= 1;
5169 /* target_terminal_inferior implementation. */
5172 linux_nat_terminal_inferior (void)
5174 if (!target_is_async_p ())
5176 /* Async mode is disabled. */
5177 terminal_inferior ();
5181 terminal_inferior ();
5183 /* Calls to target_terminal_*() are meant to be idempotent. */
5184 if (!async_terminal_is_ours
)
5187 delete_file_handler (input_fd
);
5188 async_terminal_is_ours
= 0;
5192 /* target_terminal_ours implementation. */
5195 linux_nat_terminal_ours (void)
5197 if (!target_is_async_p ())
5199 /* Async mode is disabled. */
5204 /* GDB should never give the terminal to the inferior if the
5205 inferior is running in the background (run&, continue&, etc.),
5206 but claiming it sure should. */
5209 if (async_terminal_is_ours
)
5212 clear_sigint_trap ();
5213 add_file_handler (input_fd
, stdin_event_handler
, 0);
5214 async_terminal_is_ours
= 1;
5217 static void (*async_client_callback
) (enum inferior_event_type event_type
,
5219 static void *async_client_context
;
5221 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5222 so we notice when any child changes state, and notify the
5223 event-loop; it allows us to use sigsuspend in linux_nat_wait_1
5224 above to wait for the arrival of a SIGCHLD. */
5227 sigchld_handler (int signo
)
5229 int old_errno
= errno
;
5231 if (debug_linux_nat_async
)
5232 fprintf_unfiltered (gdb_stdlog
, "sigchld\n");
5234 if (signo
== SIGCHLD
5235 && linux_nat_event_pipe
[0] != -1)
5236 async_file_mark (); /* Let the event loop know that there are
5237 events to handle. */
5242 /* Callback registered with the target events file descriptor. */
5245 handle_target_event (int error
, gdb_client_data client_data
)
5247 (*async_client_callback
) (INF_REG_EVENT
, async_client_context
);
5250 /* Create/destroy the target events pipe. Returns previous state. */
5253 linux_async_pipe (int enable
)
5255 int previous
= (linux_nat_event_pipe
[0] != -1);
5257 if (previous
!= enable
)
5261 block_child_signals (&prev_mask
);
5265 if (pipe (linux_nat_event_pipe
) == -1)
5266 internal_error (__FILE__
, __LINE__
,
5267 "creating event pipe failed.");
5269 fcntl (linux_nat_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5270 fcntl (linux_nat_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5274 close (linux_nat_event_pipe
[0]);
5275 close (linux_nat_event_pipe
[1]);
5276 linux_nat_event_pipe
[0] = -1;
5277 linux_nat_event_pipe
[1] = -1;
5280 restore_child_signals_mask (&prev_mask
);
5286 /* target_async implementation. */
5289 linux_nat_async (void (*callback
) (enum inferior_event_type event_type
,
5290 void *context
), void *context
)
5292 if (linux_nat_async_mask_value
== 0 || !target_async_permitted
)
5293 internal_error (__FILE__
, __LINE__
,
5294 "Calling target_async when async is masked");
5296 if (callback
!= NULL
)
5298 async_client_callback
= callback
;
5299 async_client_context
= context
;
5300 if (!linux_async_pipe (1))
5302 add_file_handler (linux_nat_event_pipe
[0],
5303 handle_target_event
, NULL
);
5304 /* There may be pending events to handle. Tell the event loop
5311 async_client_callback
= callback
;
5312 async_client_context
= context
;
5313 delete_file_handler (linux_nat_event_pipe
[0]);
5314 linux_async_pipe (0);
5319 /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other
5323 linux_nat_stop_lwp (struct lwp_info
*lwp
, void *data
)
5328 ptid_t ptid
= lwp
->ptid
;
5330 if (debug_linux_nat
)
5331 fprintf_unfiltered (gdb_stdlog
,
5332 "LNSL: running -> suspending %s\n",
5333 target_pid_to_str (lwp
->ptid
));
5336 stop_callback (lwp
, NULL
);
5337 stop_wait_callback (lwp
, NULL
);
5339 /* If the lwp exits while we try to stop it, there's nothing
5341 lwp
= find_lwp_pid (ptid
);
5345 /* If we didn't collect any signal other than SIGSTOP while
5346 stopping the LWP, push a SIGNAL_0 event. In either case, the
5347 event-loop will end up calling target_wait which will collect
5349 if (lwp
->status
== 0)
5350 lwp
->status
= W_STOPCODE (0);
5355 /* Already known to be stopped; do nothing. */
5357 if (debug_linux_nat
)
5359 if (find_thread_ptid (lwp
->ptid
)->stop_requested
)
5360 fprintf_unfiltered (gdb_stdlog
, "\
5361 LNSL: already stopped/stop_requested %s\n",
5362 target_pid_to_str (lwp
->ptid
));
5364 fprintf_unfiltered (gdb_stdlog
, "\
5365 LNSL: already stopped/no stop_requested yet %s\n",
5366 target_pid_to_str (lwp
->ptid
));
5373 linux_nat_stop (ptid_t ptid
)
5376 iterate_over_lwps (ptid
, linux_nat_stop_lwp
, NULL
);
5378 linux_ops
->to_stop (ptid
);
5382 linux_nat_close (int quitting
)
5384 /* Unregister from the event loop. */
5385 if (target_is_async_p ())
5386 target_async (NULL
, 0);
5388 /* Reset the async_masking. */
5389 linux_nat_async_mask_value
= 1;
5391 if (linux_ops
->to_close
)
5392 linux_ops
->to_close (quitting
);
5395 /* When requests are passed down from the linux-nat layer to the
5396 single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are
5397 used. The address space pointer is stored in the inferior object,
5398 but the common code that is passed such ptid can't tell whether
5399 lwpid is a "main" process id or not (it assumes so). We reverse
5400 look up the "main" process id from the lwp here. */
5402 struct address_space
*
5403 linux_nat_thread_address_space (struct target_ops
*t
, ptid_t ptid
)
5405 struct lwp_info
*lwp
;
5406 struct inferior
*inf
;
5409 pid
= GET_LWP (ptid
);
5410 if (GET_LWP (ptid
) == 0)
5412 /* An (lwpid,0,0) ptid. Look up the lwp object to get at the
5414 lwp
= find_lwp_pid (ptid
);
5415 pid
= GET_PID (lwp
->ptid
);
5419 /* A (pid,lwpid,0) ptid. */
5420 pid
= GET_PID (ptid
);
5423 inf
= find_inferior_pid (pid
);
5424 gdb_assert (inf
!= NULL
);
5429 linux_nat_core_of_thread_1 (ptid_t ptid
)
5431 struct cleanup
*back_to
;
5434 char *content
= NULL
;
5437 int content_read
= 0;
5441 filename
= xstrprintf ("/proc/%d/task/%ld/stat",
5442 GET_PID (ptid
), GET_LWP (ptid
));
5443 back_to
= make_cleanup (xfree
, filename
);
5445 f
= fopen (filename
, "r");
5448 do_cleanups (back_to
);
5452 make_cleanup_fclose (f
);
5457 content
= xrealloc (content
, content_read
+ 1024);
5458 n
= fread (content
+ content_read
, 1, 1024, f
);
5462 content
[content_read
] = '\0';
5467 make_cleanup (xfree
, content
);
5469 p
= strchr (content
, '(');
5470 p
= strchr (p
, ')') + 2; /* skip ")" and a whitespace. */
5472 /* If the first field after program name has index 0, then core number is
5473 the field with index 36. There's no constant for that anywhere. */
5474 p
= strtok_r (p
, " ", &ts
);
5475 for (i
= 0; i
!= 36; ++i
)
5476 p
= strtok_r (NULL
, " ", &ts
);
5478 if (sscanf (p
, "%d", &core
) == 0)
5481 do_cleanups (back_to
);
5486 /* Return the cached value of the processor core for thread PTID. */
5489 linux_nat_core_of_thread (struct target_ops
*ops
, ptid_t ptid
)
5491 struct lwp_info
*info
= find_lwp_pid (ptid
);
5498 linux_nat_add_target (struct target_ops
*t
)
5500 /* Save the provided single-threaded target. We save this in a separate
5501 variable because another target we've inherited from (e.g. inf-ptrace)
5502 may have saved a pointer to T; we want to use it for the final
5503 process stratum target. */
5504 linux_ops_saved
= *t
;
5505 linux_ops
= &linux_ops_saved
;
5507 /* Override some methods for multithreading. */
5508 t
->to_create_inferior
= linux_nat_create_inferior
;
5509 t
->to_attach
= linux_nat_attach
;
5510 t
->to_detach
= linux_nat_detach
;
5511 t
->to_resume
= linux_nat_resume
;
5512 t
->to_wait
= linux_nat_wait
;
5513 t
->to_xfer_partial
= linux_nat_xfer_partial
;
5514 t
->to_kill
= linux_nat_kill
;
5515 t
->to_mourn_inferior
= linux_nat_mourn_inferior
;
5516 t
->to_thread_alive
= linux_nat_thread_alive
;
5517 t
->to_pid_to_str
= linux_nat_pid_to_str
;
5518 t
->to_has_thread_control
= tc_schedlock
;
5519 t
->to_thread_address_space
= linux_nat_thread_address_space
;
5520 t
->to_stopped_by_watchpoint
= linux_nat_stopped_by_watchpoint
;
5521 t
->to_stopped_data_address
= linux_nat_stopped_data_address
;
5523 t
->to_can_async_p
= linux_nat_can_async_p
;
5524 t
->to_is_async_p
= linux_nat_is_async_p
;
5525 t
->to_supports_non_stop
= linux_nat_supports_non_stop
;
5526 t
->to_async
= linux_nat_async
;
5527 t
->to_async_mask
= linux_nat_async_mask
;
5528 t
->to_terminal_inferior
= linux_nat_terminal_inferior
;
5529 t
->to_terminal_ours
= linux_nat_terminal_ours
;
5530 t
->to_close
= linux_nat_close
;
5532 /* Methods for non-stop support. */
5533 t
->to_stop
= linux_nat_stop
;
5535 t
->to_supports_multi_process
= linux_nat_supports_multi_process
;
5537 t
->to_core_of_thread
= linux_nat_core_of_thread
;
5539 /* We don't change the stratum; this target will sit at
5540 process_stratum and thread_db will set at thread_stratum. This
5541 is a little strange, since this is a multi-threaded-capable
5542 target, but we want to be on the stack below thread_db, and we
5543 also want to be used for single-threaded processes. */
5548 /* Register a method to call whenever a new thread is attached. */
5550 linux_nat_set_new_thread (struct target_ops
*t
, void (*new_thread
) (ptid_t
))
5552 /* Save the pointer. We only support a single registered instance
5553 of the GNU/Linux native target, so we do not need to map this to
5555 linux_nat_new_thread
= new_thread
;
5558 /* Register a method that converts a siginfo object between the layout
5559 that ptrace returns, and the layout in the architecture of the
5562 linux_nat_set_siginfo_fixup (struct target_ops
*t
,
5563 int (*siginfo_fixup
) (struct siginfo
*,
5567 /* Save the pointer. */
5568 linux_nat_siginfo_fixup
= siginfo_fixup
;
5571 /* Return the saved siginfo associated with PTID. */
5573 linux_nat_get_siginfo (ptid_t ptid
)
5575 struct lwp_info
*lp
= find_lwp_pid (ptid
);
5577 gdb_assert (lp
!= NULL
);
5579 return &lp
->siginfo
;
5582 /* Provide a prototype to silence -Wmissing-prototypes. */
5583 extern initialize_file_ftype _initialize_linux_nat
;
5586 _initialize_linux_nat (void)
5590 add_info ("proc", linux_nat_info_proc_cmd
, _("\
5591 Show /proc process information about any running process.\n\
5592 Specify any process id, or use the program being debugged by default.\n\
5593 Specify any of the following keywords for detailed info:\n\
5594 mappings -- list of mapped memory regions.\n\
5595 stat -- list a bunch of random process info.\n\
5596 status -- list a different bunch of random process info.\n\
5597 all -- list all available /proc info."));
5599 add_setshow_zinteger_cmd ("lin-lwp", class_maintenance
,
5600 &debug_linux_nat
, _("\
5601 Set debugging of GNU/Linux lwp module."), _("\
5602 Show debugging of GNU/Linux lwp module."), _("\
5603 Enables printf debugging output."),
5605 show_debug_linux_nat
,
5606 &setdebuglist
, &showdebuglist
);
5608 add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance
,
5609 &debug_linux_nat_async
, _("\
5610 Set debugging of GNU/Linux async lwp module."), _("\
5611 Show debugging of GNU/Linux async lwp module."), _("\
5612 Enables printf debugging output."),
5614 show_debug_linux_nat_async
,
5615 &setdebuglist
, &showdebuglist
);
5617 /* Save this mask as the default. */
5618 sigprocmask (SIG_SETMASK
, NULL
, &normal_mask
);
5620 /* Install a SIGCHLD handler. */
5621 sigchld_action
.sa_handler
= sigchld_handler
;
5622 sigemptyset (&sigchld_action
.sa_mask
);
5623 sigchld_action
.sa_flags
= SA_RESTART
;
5625 /* Make it the default. */
5626 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
5628 /* Make sure we don't block SIGCHLD during a sigsuspend. */
5629 sigprocmask (SIG_SETMASK
, NULL
, &suspend_mask
);
5630 sigdelset (&suspend_mask
, SIGCHLD
);
5632 sigemptyset (&blocked_mask
);
5634 add_setshow_boolean_cmd ("disable-randomization", class_support
,
5635 &disable_randomization
, _("\
5636 Set disabling of debuggee's virtual address space randomization."), _("\
5637 Show disabling of debuggee's virtual address space randomization."), _("\
5638 When this mode is on (which is the default), randomization of the virtual\n\
5639 address space is disabled. Standalone programs run with the randomization\n\
5640 enabled by default on some platforms."),
5641 &set_disable_randomization
,
5642 &show_disable_randomization
,
5643 &setlist
, &showlist
);
5647 /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
5648 the GNU/Linux Threads library and therefore doesn't really belong
5651 /* Read variable NAME in the target and return its value if found.
5652 Otherwise return zero. It is assumed that the type of the variable
5656 get_signo (const char *name
)
5658 struct minimal_symbol
*ms
;
5661 ms
= lookup_minimal_symbol (name
, NULL
, NULL
);
5665 if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms
), (gdb_byte
*) &signo
,
5666 sizeof (signo
)) != 0)
5672 /* Return the set of signals used by the threads library in *SET. */
5675 lin_thread_get_thread_signals (sigset_t
*set
)
5677 struct sigaction action
;
5678 int restart
, cancel
;
5680 sigemptyset (&blocked_mask
);
5683 restart
= get_signo ("__pthread_sig_restart");
5684 cancel
= get_signo ("__pthread_sig_cancel");
5686 /* LinuxThreads normally uses the first two RT signals, but in some legacy
5687 cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does
5688 not provide any way for the debugger to query the signal numbers -
5689 fortunately they don't change! */
5692 restart
= __SIGRTMIN
;
5695 cancel
= __SIGRTMIN
+ 1;
5697 sigaddset (set
, restart
);
5698 sigaddset (set
, cancel
);
5700 /* The GNU/Linux Threads library makes terminating threads send a
5701 special "cancel" signal instead of SIGCHLD. Make sure we catch
5702 those (to prevent them from terminating GDB itself, which is
5703 likely to be their default action) and treat them the same way as
5706 action
.sa_handler
= sigchld_handler
;
5707 sigemptyset (&action
.sa_mask
);
5708 action
.sa_flags
= SA_RESTART
;
5709 sigaction (cancel
, &action
, NULL
);
5711 /* We block the "cancel" signal throughout this code ... */
5712 sigaddset (&blocked_mask
, cancel
);
5713 sigprocmask (SIG_BLOCK
, &blocked_mask
, NULL
);
5715 /* ... except during a sigsuspend. */
5716 sigdelset (&suspend_mask
, cancel
);