1 /* GNU/Linux native-dependent code common to multiple platforms.
3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
4 2011 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-ptrace.h"
34 #include "linux-fork.h"
35 #include "gdbthread.h"
39 #include "inf-ptrace.h"
41 #include <sys/param.h> /* for MAXPATHLEN */
42 #include <sys/procfs.h> /* for elf_gregset etc. */
43 #include "elf-bfd.h" /* for elfcore_write_* */
44 #include "gregset.h" /* for gregset */
45 #include "gdbcore.h" /* for get_exec_file */
46 #include <ctype.h> /* for isdigit */
47 #include "gdbthread.h" /* for struct thread_info etc. */
48 #include "gdb_stat.h" /* for struct stat */
49 #include <fcntl.h> /* for O_RDONLY */
51 #include "event-loop.h"
52 #include "event-top.h"
54 #include <sys/types.h>
55 #include "gdb_dirent.h"
56 #include "xml-support.h"
62 #define SPUFS_MAGIC 0x23c9b64e
65 #ifdef HAVE_PERSONALITY
66 # include <sys/personality.h>
67 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
68 # define ADDR_NO_RANDOMIZE 0x0040000
70 #endif /* HAVE_PERSONALITY */
72 /* This comment documents high-level logic of this file.
74 Waiting for events in sync mode
75 ===============================
77 When waiting for an event in a specific thread, we just use waitpid, passing
78 the specific pid, and not passing WNOHANG.
80 When waiting for an event in all threads, waitpid is not quite good. Prior to
81 version 2.4, Linux can either wait for event in main thread, or in secondary
82 threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might
83 miss an event. The solution is to use non-blocking waitpid, together with
84 sigsuspend. First, we use non-blocking waitpid to get an event in the main
85 process, if any. Second, we use non-blocking waitpid with the __WCLONED
86 flag to check for events in cloned processes. If nothing is found, we use
87 sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something
88 happened to a child process -- and SIGCHLD will be delivered both for events
89 in main debugged process and in cloned processes. As soon as we know there's
90 an event, we get back to calling nonblocking waitpid with and without
93 Note that SIGCHLD should be blocked between waitpid and sigsuspend calls,
94 so that we don't miss a signal. If SIGCHLD arrives in between, when it's
95 blocked, the signal becomes pending and sigsuspend immediately
96 notices it and returns.
98 Waiting for events in async mode
99 ================================
101 In async mode, GDB should always be ready to handle both user input
102 and target events, so neither blocking waitpid nor sigsuspend are
103 viable options. Instead, we should asynchronously notify the GDB main
104 event loop whenever there's an unprocessed event from the target. We
105 detect asynchronous target events by handling SIGCHLD signals. To
106 notify the event loop about target events, the self-pipe trick is used
107 --- a pipe is registered as waitable event source in the event loop,
108 the event loop select/poll's on the read end of this pipe (as well on
109 other event sources, e.g., stdin), and the SIGCHLD handler writes a
110 byte to this pipe. This is more portable than relying on
111 pselect/ppoll, since on kernels that lack those syscalls, libc
112 emulates them with select/poll+sigprocmask, and that is racy
113 (a.k.a. plain broken).
115 Obviously, if we fail to notify the event loop if there's a target
116 event, it's bad. OTOH, if we notify the event loop when there's no
117 event from the target, linux_nat_wait will detect that there's no real
118 event to report, and return event of type TARGET_WAITKIND_IGNORE.
119 This is mostly harmless, but it will waste time and is better avoided.
121 The main design point is that every time GDB is outside linux-nat.c,
122 we have a SIGCHLD handler installed that is called when something
123 happens to the target and notifies the GDB event loop. Whenever GDB
124 core decides to handle the event, and calls into linux-nat.c, we
125 process things as in sync mode, except that the we never block in
128 While processing an event, we may end up momentarily blocked in
129 waitpid calls. Those waitpid calls, while blocking, are guarantied to
130 return quickly. E.g., in all-stop mode, before reporting to the core
131 that an LWP hit a breakpoint, all LWPs are stopped by sending them
132 SIGSTOP, and synchronously waiting for the SIGSTOP to be reported.
133 Note that this is different from blocking indefinitely waiting for the
134 next event --- here, we're already handling an event.
139 We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another
140 signal is not entirely significant; we just need for a signal to be delivered,
141 so that we can intercept it. SIGSTOP's advantage is that it can not be
142 blocked. A disadvantage is that it is not a real-time signal, so it can only
143 be queued once; we do not keep track of other sources of SIGSTOP.
145 Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't
146 use them, because they have special behavior when the signal is generated -
147 not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL
148 kills the entire thread group.
150 A delivered SIGSTOP would stop the entire thread group, not just the thread we
151 tkill'd. But we never let the SIGSTOP be delivered; we always intercept and
152 cancel it (by PTRACE_CONT without passing SIGSTOP).
154 We could use a real-time signal instead. This would solve those problems; we
155 could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB.
156 But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH
157 generates it, and there are races with trying to find a signal that is not
161 #define O_LARGEFILE 0
164 /* Unlike other extended result codes, WSTOPSIG (status) on
165 PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but
166 instead SIGTRAP with bit 7 set. */
167 #define SYSCALL_SIGTRAP (SIGTRAP | 0x80)
169 /* The single-threaded native GNU/Linux target_ops. We save a pointer for
170 the use of the multi-threaded target. */
171 static struct target_ops
*linux_ops
;
172 static struct target_ops linux_ops_saved
;
174 /* The method to call, if any, when a new thread is attached. */
175 static void (*linux_nat_new_thread
) (ptid_t
);
177 /* The method to call, if any, when the siginfo object needs to be
178 converted between the layout returned by ptrace, and the layout in
179 the architecture of the inferior. */
180 static int (*linux_nat_siginfo_fixup
) (struct siginfo
*,
184 /* The saved to_xfer_partial method, inherited from inf-ptrace.c.
185 Called by our to_xfer_partial. */
186 static LONGEST (*super_xfer_partial
) (struct target_ops
*,
188 const char *, gdb_byte
*,
192 static int debug_linux_nat
;
194 show_debug_linux_nat (struct ui_file
*file
, int from_tty
,
195 struct cmd_list_element
*c
, const char *value
)
197 fprintf_filtered (file
, _("Debugging of GNU/Linux lwp module is %s.\n"),
201 static int debug_linux_nat_async
= 0;
203 show_debug_linux_nat_async (struct ui_file
*file
, int from_tty
,
204 struct cmd_list_element
*c
, const char *value
)
206 fprintf_filtered (file
,
207 _("Debugging of GNU/Linux async lwp module is %s.\n"),
211 static int disable_randomization
= 1;
214 show_disable_randomization (struct ui_file
*file
, int from_tty
,
215 struct cmd_list_element
*c
, const char *value
)
217 #ifdef HAVE_PERSONALITY
218 fprintf_filtered (file
,
219 _("Disabling randomization of debuggee's "
220 "virtual address space is %s.\n"),
222 #else /* !HAVE_PERSONALITY */
223 fputs_filtered (_("Disabling randomization of debuggee's "
224 "virtual address space is unsupported on\n"
225 "this platform.\n"), file
);
226 #endif /* !HAVE_PERSONALITY */
230 set_disable_randomization (char *args
, int from_tty
,
231 struct cmd_list_element
*c
)
233 #ifndef HAVE_PERSONALITY
234 error (_("Disabling randomization of debuggee's "
235 "virtual address space is unsupported on\n"
237 #endif /* !HAVE_PERSONALITY */
240 struct simple_pid_list
244 struct simple_pid_list
*next
;
246 struct simple_pid_list
*stopped_pids
;
248 /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK
249 can not be used, 1 if it can. */
251 static int linux_supports_tracefork_flag
= -1;
253 /* This variable is a tri-state flag: -1 for unknown, 0 if
254 PTRACE_O_TRACESYSGOOD can not be used, 1 if it can. */
256 static int linux_supports_tracesysgood_flag
= -1;
258 /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have
259 PTRACE_O_TRACEVFORKDONE. */
261 static int linux_supports_tracevforkdone_flag
= -1;
263 /* Async mode support. */
265 /* Zero if the async mode, although enabled, is masked, which means
266 linux_nat_wait should behave as if async mode was off. */
267 static int linux_nat_async_mask_value
= 1;
269 /* Stores the current used ptrace() options. */
270 static int current_ptrace_options
= 0;
272 /* The read/write ends of the pipe registered as waitable file in the
274 static int linux_nat_event_pipe
[2] = { -1, -1 };
276 /* Flush the event pipe. */
279 async_file_flush (void)
286 ret
= read (linux_nat_event_pipe
[0], &buf
, 1);
288 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
291 /* Put something (anything, doesn't matter what, or how much) in event
292 pipe, so that the select/poll in the event-loop realizes we have
293 something to process. */
296 async_file_mark (void)
300 /* It doesn't really matter what the pipe contains, as long we end
301 up with something in it. Might as well flush the previous
307 ret
= write (linux_nat_event_pipe
[1], "+", 1);
309 while (ret
== -1 && errno
== EINTR
);
311 /* Ignore EAGAIN. If the pipe is full, the event loop will already
312 be awakened anyway. */
315 static void linux_nat_async (void (*callback
)
316 (enum inferior_event_type event_type
,
319 static int linux_nat_async_mask (int mask
);
320 static int kill_lwp (int lwpid
, int signo
);
322 static int stop_callback (struct lwp_info
*lp
, void *data
);
324 static void block_child_signals (sigset_t
*prev_mask
);
325 static void restore_child_signals_mask (sigset_t
*prev_mask
);
328 static struct lwp_info
*add_lwp (ptid_t ptid
);
329 static void purge_lwp_list (int pid
);
330 static struct lwp_info
*find_lwp_pid (ptid_t ptid
);
333 /* Trivial list manipulation functions to keep track of a list of
334 new stopped processes. */
336 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
338 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
341 new_pid
->status
= status
;
342 new_pid
->next
= *listp
;
347 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
349 struct simple_pid_list
**p
;
351 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
352 if ((*p
)->pid
== pid
)
354 struct simple_pid_list
*next
= (*p
)->next
;
356 *statusp
= (*p
)->status
;
365 linux_record_stopped_pid (int pid
, int status
)
367 add_to_pid_list (&stopped_pids
, pid
, status
);
371 /* A helper function for linux_test_for_tracefork, called after fork (). */
374 linux_tracefork_child (void)
376 ptrace (PTRACE_TRACEME
, 0, 0, 0);
377 kill (getpid (), SIGSTOP
);
382 /* Wrapper function for waitpid which handles EINTR. */
385 my_waitpid (int pid
, int *statusp
, int flags
)
391 ret
= waitpid (pid
, statusp
, flags
);
393 while (ret
== -1 && errno
== EINTR
);
398 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events.
400 First, we try to enable fork tracing on ORIGINAL_PID. If this fails,
401 we know that the feature is not available. This may change the tracing
402 options for ORIGINAL_PID, but we'll be setting them shortly anyway.
404 However, if it succeeds, we don't know for sure that the feature is
405 available; old versions of PTRACE_SETOPTIONS ignored unknown options. We
406 create a child process, attach to it, use PTRACE_SETOPTIONS to enable
407 fork tracing, and let it fork. If the process exits, we assume that we
408 can't use TRACEFORK; if we get the fork notification, and we can extract
409 the new child's PID, then we assume that we can. */
412 linux_test_for_tracefork (int original_pid
)
414 int child_pid
, ret
, status
;
418 /* We don't want those ptrace calls to be interrupted. */
419 block_child_signals (&prev_mask
);
421 linux_supports_tracefork_flag
= 0;
422 linux_supports_tracevforkdone_flag
= 0;
424 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACEFORK
);
427 restore_child_signals_mask (&prev_mask
);
433 perror_with_name (("fork"));
436 linux_tracefork_child ();
438 ret
= my_waitpid (child_pid
, &status
, 0);
440 perror_with_name (("waitpid"));
441 else if (ret
!= child_pid
)
442 error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret
);
443 if (! WIFSTOPPED (status
))
444 error (_("linux_test_for_tracefork: waitpid: unexpected status %d."),
447 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0, PTRACE_O_TRACEFORK
);
450 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
453 warning (_("linux_test_for_tracefork: failed to kill child"));
454 restore_child_signals_mask (&prev_mask
);
458 ret
= my_waitpid (child_pid
, &status
, 0);
459 if (ret
!= child_pid
)
460 warning (_("linux_test_for_tracefork: failed "
461 "to wait for killed child"));
462 else if (!WIFSIGNALED (status
))
463 warning (_("linux_test_for_tracefork: unexpected "
464 "wait status 0x%x from killed child"), status
);
466 restore_child_signals_mask (&prev_mask
);
470 /* Check whether PTRACE_O_TRACEVFORKDONE is available. */
471 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0,
472 PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORKDONE
);
473 linux_supports_tracevforkdone_flag
= (ret
== 0);
475 ret
= ptrace (PTRACE_CONT
, child_pid
, 0, 0);
477 warning (_("linux_test_for_tracefork: failed to resume child"));
479 ret
= my_waitpid (child_pid
, &status
, 0);
481 if (ret
== child_pid
&& WIFSTOPPED (status
)
482 && status
>> 16 == PTRACE_EVENT_FORK
)
485 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, 0, &second_pid
);
486 if (ret
== 0 && second_pid
!= 0)
490 linux_supports_tracefork_flag
= 1;
491 my_waitpid (second_pid
, &second_status
, 0);
492 ret
= ptrace (PTRACE_KILL
, second_pid
, 0, 0);
494 warning (_("linux_test_for_tracefork: "
495 "failed to kill second child"));
496 my_waitpid (second_pid
, &status
, 0);
500 warning (_("linux_test_for_tracefork: unexpected result from waitpid "
501 "(%d, status 0x%x)"), ret
, status
);
503 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
505 warning (_("linux_test_for_tracefork: failed to kill child"));
506 my_waitpid (child_pid
, &status
, 0);
508 restore_child_signals_mask (&prev_mask
);
511 /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls.
513 We try to enable syscall tracing on ORIGINAL_PID. If this fails,
514 we know that the feature is not available. This may change the tracing
515 options for ORIGINAL_PID, but we'll be setting them shortly anyway. */
518 linux_test_for_tracesysgood (int original_pid
)
523 /* We don't want those ptrace calls to be interrupted. */
524 block_child_signals (&prev_mask
);
526 linux_supports_tracesysgood_flag
= 0;
528 ret
= ptrace (PTRACE_SETOPTIONS
, original_pid
, 0, PTRACE_O_TRACESYSGOOD
);
532 linux_supports_tracesysgood_flag
= 1;
534 restore_child_signals_mask (&prev_mask
);
537 /* Determine wether we support PTRACE_O_TRACESYSGOOD option available.
538 This function also sets linux_supports_tracesysgood_flag. */
541 linux_supports_tracesysgood (int pid
)
543 if (linux_supports_tracesysgood_flag
== -1)
544 linux_test_for_tracesysgood (pid
);
545 return linux_supports_tracesysgood_flag
;
548 /* Return non-zero iff we have tracefork functionality available.
549 This function also sets linux_supports_tracefork_flag. */
552 linux_supports_tracefork (int pid
)
554 if (linux_supports_tracefork_flag
== -1)
555 linux_test_for_tracefork (pid
);
556 return linux_supports_tracefork_flag
;
560 linux_supports_tracevforkdone (int pid
)
562 if (linux_supports_tracefork_flag
== -1)
563 linux_test_for_tracefork (pid
);
564 return linux_supports_tracevforkdone_flag
;
568 linux_enable_tracesysgood (ptid_t ptid
)
570 int pid
= ptid_get_lwp (ptid
);
573 pid
= ptid_get_pid (ptid
);
575 if (linux_supports_tracesysgood (pid
) == 0)
578 current_ptrace_options
|= PTRACE_O_TRACESYSGOOD
;
580 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
585 linux_enable_event_reporting (ptid_t ptid
)
587 int pid
= ptid_get_lwp (ptid
);
590 pid
= ptid_get_pid (ptid
);
592 if (! linux_supports_tracefork (pid
))
595 current_ptrace_options
|= PTRACE_O_TRACEFORK
| PTRACE_O_TRACEVFORK
596 | PTRACE_O_TRACEEXEC
| PTRACE_O_TRACECLONE
;
598 if (linux_supports_tracevforkdone (pid
))
599 current_ptrace_options
|= PTRACE_O_TRACEVFORKDONE
;
601 /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
602 read-only process state. */
604 ptrace (PTRACE_SETOPTIONS
, pid
, 0, current_ptrace_options
);
608 linux_child_post_attach (int pid
)
610 linux_enable_event_reporting (pid_to_ptid (pid
));
611 check_for_thread_db ();
612 linux_enable_tracesysgood (pid_to_ptid (pid
));
616 linux_child_post_startup_inferior (ptid_t ptid
)
618 linux_enable_event_reporting (ptid
);
619 check_for_thread_db ();
620 linux_enable_tracesysgood (ptid
);
624 linux_child_follow_fork (struct target_ops
*ops
, int follow_child
)
628 int parent_pid
, child_pid
;
630 block_child_signals (&prev_mask
);
632 has_vforked
= (inferior_thread ()->pending_follow
.kind
633 == TARGET_WAITKIND_VFORKED
);
634 parent_pid
= ptid_get_lwp (inferior_ptid
);
636 parent_pid
= ptid_get_pid (inferior_ptid
);
637 child_pid
= PIDGET (inferior_thread ()->pending_follow
.value
.related_pid
);
640 linux_enable_event_reporting (pid_to_ptid (child_pid
));
643 && !non_stop
/* Non-stop always resumes both branches. */
644 && (!target_is_async_p () || sync_execution
)
645 && !(follow_child
|| detach_fork
|| sched_multi
))
647 /* The parent stays blocked inside the vfork syscall until the
648 child execs or exits. If we don't let the child run, then
649 the parent stays blocked. If we're telling the parent to run
650 in the foreground, the user will not be able to ctrl-c to get
651 back the terminal, effectively hanging the debug session. */
652 fprintf_filtered (gdb_stderr
, _("\
653 Can not resume the parent process over vfork in the foreground while\n\
654 holding the child stopped. Try \"set detach-on-fork\" or \
655 \"set schedule-multiple\".\n"));
656 /* FIXME output string > 80 columns. */
662 struct lwp_info
*child_lp
= NULL
;
664 /* We're already attached to the parent, by default. */
666 /* Detach new forked process? */
669 /* Before detaching from the child, remove all breakpoints
670 from it. If we forked, then this has already been taken
671 care of by infrun.c. If we vforked however, any
672 breakpoint inserted in the parent is visible in the
673 child, even those added while stopped in a vfork
674 catchpoint. This will remove the breakpoints from the
675 parent also, but they'll be reinserted below. */
678 /* keep breakpoints list in sync. */
679 remove_breakpoints_pid (GET_PID (inferior_ptid
));
682 if (info_verbose
|| debug_linux_nat
)
684 target_terminal_ours ();
685 fprintf_filtered (gdb_stdlog
,
686 "Detaching after fork from "
687 "child process %d.\n",
691 ptrace (PTRACE_DETACH
, child_pid
, 0, 0);
695 struct inferior
*parent_inf
, *child_inf
;
696 struct cleanup
*old_chain
;
698 /* Add process to GDB's tables. */
699 child_inf
= add_inferior (child_pid
);
701 parent_inf
= current_inferior ();
702 child_inf
->attach_flag
= parent_inf
->attach_flag
;
703 copy_terminal_info (child_inf
, parent_inf
);
705 old_chain
= save_inferior_ptid ();
706 save_current_program_space ();
708 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
709 add_thread (inferior_ptid
);
710 child_lp
= add_lwp (inferior_ptid
);
711 child_lp
->stopped
= 1;
712 child_lp
->resumed
= 1;
714 /* If this is a vfork child, then the address-space is
715 shared with the parent. */
718 child_inf
->pspace
= parent_inf
->pspace
;
719 child_inf
->aspace
= parent_inf
->aspace
;
721 /* The parent will be frozen until the child is done
722 with the shared region. Keep track of the
724 child_inf
->vfork_parent
= parent_inf
;
725 child_inf
->pending_detach
= 0;
726 parent_inf
->vfork_child
= child_inf
;
727 parent_inf
->pending_detach
= 0;
731 child_inf
->aspace
= new_address_space ();
732 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
733 child_inf
->removable
= 1;
734 set_current_program_space (child_inf
->pspace
);
735 clone_program_space (child_inf
->pspace
, parent_inf
->pspace
);
737 /* Let the shared library layer (solib-svr4) learn about
738 this new process, relocate the cloned exec, pull in
739 shared libraries, and install the solib event
740 breakpoint. If a "cloned-VM" event was propagated
741 better throughout the core, this wouldn't be
743 solib_create_inferior_hook (0);
746 /* Let the thread_db layer learn about this new process. */
747 check_for_thread_db ();
749 do_cleanups (old_chain
);
755 struct inferior
*parent_inf
;
757 parent_inf
= current_inferior ();
759 /* If we detached from the child, then we have to be careful
760 to not insert breakpoints in the parent until the child
761 is done with the shared memory region. However, if we're
762 staying attached to the child, then we can and should
763 insert breakpoints, so that we can debug it. A
764 subsequent child exec or exit is enough to know when does
765 the child stops using the parent's address space. */
766 parent_inf
->waiting_for_vfork_done
= detach_fork
;
767 parent_inf
->pspace
->breakpoints_not_allowed
= detach_fork
;
769 lp
= find_lwp_pid (pid_to_ptid (parent_pid
));
770 gdb_assert (linux_supports_tracefork_flag
>= 0);
771 if (linux_supports_tracevforkdone (0))
774 fprintf_unfiltered (gdb_stdlog
,
775 "LCFF: waiting for VFORK_DONE on %d\n",
781 /* We'll handle the VFORK_DONE event like any other
782 event, in target_wait. */
786 /* We can't insert breakpoints until the child has
787 finished with the shared memory region. We need to
788 wait until that happens. Ideal would be to just
790 - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0);
791 - waitpid (parent_pid, &status, __WALL);
792 However, most architectures can't handle a syscall
793 being traced on the way out if it wasn't traced on
796 We might also think to loop, continuing the child
797 until it exits or gets a SIGTRAP. One problem is
798 that the child might call ptrace with PTRACE_TRACEME.
800 There's no simple and reliable way to figure out when
801 the vforked child will be done with its copy of the
802 shared memory. We could step it out of the syscall,
803 two instructions, let it go, and then single-step the
804 parent once. When we have hardware single-step, this
805 would work; with software single-step it could still
806 be made to work but we'd have to be able to insert
807 single-step breakpoints in the child, and we'd have
808 to insert -just- the single-step breakpoint in the
809 parent. Very awkward.
811 In the end, the best we can do is to make sure it
812 runs for a little while. Hopefully it will be out of
813 range of any breakpoints we reinsert. Usually this
814 is only the single-step breakpoint at vfork's return
818 fprintf_unfiltered (gdb_stdlog
,
819 "LCFF: no VFORK_DONE "
820 "support, sleeping a bit\n");
824 /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event,
825 and leave it pending. The next linux_nat_resume call
826 will notice a pending event, and bypasses actually
827 resuming the inferior. */
829 lp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
833 /* If we're in async mode, need to tell the event loop
834 there's something here to process. */
835 if (target_can_async_p ())
842 struct inferior
*parent_inf
, *child_inf
;
844 struct program_space
*parent_pspace
;
846 if (info_verbose
|| debug_linux_nat
)
848 target_terminal_ours ();
850 fprintf_filtered (gdb_stdlog
,
851 _("Attaching after process %d "
852 "vfork to child process %d.\n"),
853 parent_pid
, child_pid
);
855 fprintf_filtered (gdb_stdlog
,
856 _("Attaching after process %d "
857 "fork to child process %d.\n"),
858 parent_pid
, child_pid
);
861 /* Add the new inferior first, so that the target_detach below
862 doesn't unpush the target. */
864 child_inf
= add_inferior (child_pid
);
866 parent_inf
= current_inferior ();
867 child_inf
->attach_flag
= parent_inf
->attach_flag
;
868 copy_terminal_info (child_inf
, parent_inf
);
870 parent_pspace
= parent_inf
->pspace
;
872 /* If we're vforking, we want to hold on to the parent until the
873 child exits or execs. At child exec or exit time we can
874 remove the old breakpoints from the parent and detach or
875 resume debugging it. Otherwise, detach the parent now; we'll
876 want to reuse it's program/address spaces, but we can't set
877 them to the child before removing breakpoints from the
878 parent, otherwise, the breakpoints module could decide to
879 remove breakpoints from the wrong process (since they'd be
880 assigned to the same address space). */
884 gdb_assert (child_inf
->vfork_parent
== NULL
);
885 gdb_assert (parent_inf
->vfork_child
== NULL
);
886 child_inf
->vfork_parent
= parent_inf
;
887 child_inf
->pending_detach
= 0;
888 parent_inf
->vfork_child
= child_inf
;
889 parent_inf
->pending_detach
= detach_fork
;
890 parent_inf
->waiting_for_vfork_done
= 0;
892 else if (detach_fork
)
893 target_detach (NULL
, 0);
895 /* Note that the detach above makes PARENT_INF dangling. */
897 /* Add the child thread to the appropriate lists, and switch to
898 this new thread, before cloning the program space, and
899 informing the solib layer about this new process. */
901 inferior_ptid
= ptid_build (child_pid
, child_pid
, 0);
902 add_thread (inferior_ptid
);
903 lp
= add_lwp (inferior_ptid
);
907 /* If this is a vfork child, then the address-space is shared
908 with the parent. If we detached from the parent, then we can
909 reuse the parent's program/address spaces. */
910 if (has_vforked
|| detach_fork
)
912 child_inf
->pspace
= parent_pspace
;
913 child_inf
->aspace
= child_inf
->pspace
->aspace
;
917 child_inf
->aspace
= new_address_space ();
918 child_inf
->pspace
= add_program_space (child_inf
->aspace
);
919 child_inf
->removable
= 1;
920 set_current_program_space (child_inf
->pspace
);
921 clone_program_space (child_inf
->pspace
, parent_pspace
);
923 /* Let the shared library layer (solib-svr4) learn about
924 this new process, relocate the cloned exec, pull in
925 shared libraries, and install the solib event breakpoint.
926 If a "cloned-VM" event was propagated better throughout
927 the core, this wouldn't be required. */
928 solib_create_inferior_hook (0);
931 /* Let the thread_db layer learn about this new process. */
932 check_for_thread_db ();
935 restore_child_signals_mask (&prev_mask
);
941 linux_child_insert_fork_catchpoint (int pid
)
943 return !linux_supports_tracefork (pid
);
947 linux_child_insert_vfork_catchpoint (int pid
)
949 return !linux_supports_tracefork (pid
);
953 linux_child_insert_exec_catchpoint (int pid
)
955 return !linux_supports_tracefork (pid
);
959 linux_child_set_syscall_catchpoint (int pid
, int needed
, int any_count
,
960 int table_size
, int *table
)
962 if (!linux_supports_tracesysgood (pid
))
965 /* On GNU/Linux, we ignore the arguments. It means that we only
966 enable the syscall catchpoints, but do not disable them.
968 Also, we do not use the `table' information because we do not
969 filter system calls here. We let GDB do the logic for us. */
973 /* On GNU/Linux there are no real LWP's. The closest thing to LWP's
974 are processes sharing the same VM space. A multi-threaded process
975 is basically a group of such processes. However, such a grouping
976 is almost entirely a user-space issue; the kernel doesn't enforce
977 such a grouping at all (this might change in the future). In
978 general, we'll rely on the threads library (i.e. the GNU/Linux
979 Threads library) to provide such a grouping.
981 It is perfectly well possible to write a multi-threaded application
982 without the assistance of a threads library, by using the clone
983 system call directly. This module should be able to give some
984 rudimentary support for debugging such applications if developers
985 specify the CLONE_PTRACE flag in the clone system call, and are
986 using the Linux kernel 2.4 or above.
988 Note that there are some peculiarities in GNU/Linux that affect
991 - In general one should specify the __WCLONE flag to waitpid in
992 order to make it report events for any of the cloned processes
993 (and leave it out for the initial process). However, if a cloned
994 process has exited the exit status is only reported if the
995 __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
996 we cannot use it since GDB must work on older systems too.
998 - When a traced, cloned process exits and is waited for by the
999 debugger, the kernel reassigns it to the original parent and
1000 keeps it around as a "zombie". Somehow, the GNU/Linux Threads
1001 library doesn't notice this, which leads to the "zombie problem":
1002 When debugged a multi-threaded process that spawns a lot of
1003 threads will run out of processes, even if the threads exit,
1004 because the "zombies" stay around. */
1006 /* List of known LWPs. */
1007 struct lwp_info
*lwp_list
;
1010 /* Original signal mask. */
1011 static sigset_t normal_mask
;
1013 /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in
1014 _initialize_linux_nat. */
1015 static sigset_t suspend_mask
;
1017 /* Signals to block to make that sigsuspend work. */
1018 static sigset_t blocked_mask
;
1020 /* SIGCHLD action. */
1021 struct sigaction sigchld_action
;
1023 /* Block child signals (SIGCHLD and linux threads signals), and store
1024 the previous mask in PREV_MASK. */
1027 block_child_signals (sigset_t
*prev_mask
)
1029 /* Make sure SIGCHLD is blocked. */
1030 if (!sigismember (&blocked_mask
, SIGCHLD
))
1031 sigaddset (&blocked_mask
, SIGCHLD
);
1033 sigprocmask (SIG_BLOCK
, &blocked_mask
, prev_mask
);
1036 /* Restore child signals mask, previously returned by
1037 block_child_signals. */
1040 restore_child_signals_mask (sigset_t
*prev_mask
)
1042 sigprocmask (SIG_SETMASK
, prev_mask
, NULL
);
1045 /* Mask of signals to pass directly to the inferior. */
1046 static sigset_t pass_mask
;
1048 /* Update signals to pass to the inferior. */
1050 linux_nat_pass_signals (int numsigs
, unsigned char *pass_signals
)
1054 sigemptyset (&pass_mask
);
1056 for (signo
= 1; signo
< NSIG
; signo
++)
1058 int target_signo
= target_signal_from_host (signo
);
1059 if (target_signo
< numsigs
&& pass_signals
[target_signo
])
1060 sigaddset (&pass_mask
, signo
);
1066 /* Prototypes for local functions. */
1067 static int stop_wait_callback (struct lwp_info
*lp
, void *data
);
1068 static int linux_thread_alive (ptid_t ptid
);
1069 static char *linux_child_pid_to_exec_file (int pid
);
1072 /* Convert wait status STATUS to a string. Used for printing debug
1076 status_to_str (int status
)
1078 static char buf
[64];
1080 if (WIFSTOPPED (status
))
1082 if (WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
1083 snprintf (buf
, sizeof (buf
), "%s (stopped at syscall)",
1084 strsignal (SIGTRAP
));
1086 snprintf (buf
, sizeof (buf
), "%s (stopped)",
1087 strsignal (WSTOPSIG (status
)));
1089 else if (WIFSIGNALED (status
))
1090 snprintf (buf
, sizeof (buf
), "%s (terminated)",
1091 strsignal (WTERMSIG (status
)));
1093 snprintf (buf
, sizeof (buf
), "%d (exited)", WEXITSTATUS (status
));
1098 /* Remove all LWPs belong to PID from the lwp list. */
1101 purge_lwp_list (int pid
)
1103 struct lwp_info
*lp
, *lpprev
, *lpnext
;
1107 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1111 if (ptid_get_pid (lp
->ptid
) == pid
)
1114 lwp_list
= lp
->next
;
1116 lpprev
->next
= lp
->next
;
1125 /* Return the number of known LWPs in the tgid given by PID. */
1131 struct lwp_info
*lp
;
1133 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1134 if (ptid_get_pid (lp
->ptid
) == pid
)
1140 /* Add the LWP specified by PID to the list. Return a pointer to the
1141 structure describing the new LWP. The LWP should already be stopped
1142 (with an exception for the very first LWP). */
1144 static struct lwp_info
*
1145 add_lwp (ptid_t ptid
)
1147 struct lwp_info
*lp
;
1149 gdb_assert (is_lwp (ptid
));
1151 lp
= (struct lwp_info
*) xmalloc (sizeof (struct lwp_info
));
1153 memset (lp
, 0, sizeof (struct lwp_info
));
1155 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
1160 lp
->next
= lwp_list
;
1163 if (num_lwps (GET_PID (ptid
)) > 1 && linux_nat_new_thread
!= NULL
)
1164 linux_nat_new_thread (ptid
);
1169 /* Remove the LWP specified by PID from the list. */
1172 delete_lwp (ptid_t ptid
)
1174 struct lwp_info
*lp
, *lpprev
;
1178 for (lp
= lwp_list
; lp
; lpprev
= lp
, lp
= lp
->next
)
1179 if (ptid_equal (lp
->ptid
, ptid
))
1186 lpprev
->next
= lp
->next
;
1188 lwp_list
= lp
->next
;
1193 /* Return a pointer to the structure describing the LWP corresponding
1194 to PID. If no corresponding LWP could be found, return NULL. */
1196 static struct lwp_info
*
1197 find_lwp_pid (ptid_t ptid
)
1199 struct lwp_info
*lp
;
1203 lwp
= GET_LWP (ptid
);
1205 lwp
= GET_PID (ptid
);
1207 for (lp
= lwp_list
; lp
; lp
= lp
->next
)
1208 if (lwp
== GET_LWP (lp
->ptid
))
1214 /* Call CALLBACK with its second argument set to DATA for every LWP in
1215 the list. If CALLBACK returns 1 for a particular LWP, return a
1216 pointer to the structure describing that LWP immediately.
1217 Otherwise return NULL. */
1220 iterate_over_lwps (ptid_t filter
,
1221 int (*callback
) (struct lwp_info
*, void *),
1224 struct lwp_info
*lp
, *lpnext
;
1226 for (lp
= lwp_list
; lp
; lp
= lpnext
)
1230 if (ptid_match (lp
->ptid
, filter
))
1232 if ((*callback
) (lp
, data
))
1240 /* Update our internal state when changing from one checkpoint to
1241 another indicated by NEW_PTID. We can only switch single-threaded
1242 applications, so we only create one new LWP, and the previous list
1246 linux_nat_switch_fork (ptid_t new_ptid
)
1248 struct lwp_info
*lp
;
1250 purge_lwp_list (GET_PID (inferior_ptid
));
1252 lp
= add_lwp (new_ptid
);
1255 /* This changes the thread's ptid while preserving the gdb thread
1256 num. Also changes the inferior pid, while preserving the
1258 thread_change_ptid (inferior_ptid
, new_ptid
);
1260 /* We've just told GDB core that the thread changed target id, but,
1261 in fact, it really is a different thread, with different register
1263 registers_changed ();
1266 /* Handle the exit of a single thread LP. */
1269 exit_lwp (struct lwp_info
*lp
)
1271 struct thread_info
*th
= find_thread_ptid (lp
->ptid
);
1275 if (print_thread_events
)
1276 printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp
->ptid
));
1278 delete_thread (lp
->ptid
);
1281 delete_lwp (lp
->ptid
);
1284 /* Return an lwp's tgid, found in `/proc/PID/status'. */
1287 linux_proc_get_tgid (int lwpid
)
1293 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) lwpid
);
1294 status_file
= fopen (buf
, "r");
1295 if (status_file
!= NULL
)
1297 while (fgets (buf
, sizeof (buf
), status_file
))
1299 if (strncmp (buf
, "Tgid:", 5) == 0)
1301 tgid
= strtoul (buf
+ strlen ("Tgid:"), NULL
, 10);
1306 fclose (status_file
);
1312 /* Detect `T (stopped)' in `/proc/PID/status'.
1313 Other states including `T (tracing stop)' are reported as false. */
1316 pid_is_stopped (pid_t pid
)
1322 snprintf (buf
, sizeof (buf
), "/proc/%d/status", (int) pid
);
1323 status_file
= fopen (buf
, "r");
1324 if (status_file
!= NULL
)
1328 while (fgets (buf
, sizeof (buf
), status_file
))
1330 if (strncmp (buf
, "State:", 6) == 0)
1336 if (have_state
&& strstr (buf
, "T (stopped)") != NULL
)
1338 fclose (status_file
);
1343 /* Wait for the LWP specified by LP, which we have just attached to.
1344 Returns a wait status for that LWP, to cache. */
1347 linux_nat_post_attach_wait (ptid_t ptid
, int first
, int *cloned
,
1350 pid_t new_pid
, pid
= GET_LWP (ptid
);
1353 if (pid_is_stopped (pid
))
1355 if (debug_linux_nat
)
1356 fprintf_unfiltered (gdb_stdlog
,
1357 "LNPAW: Attaching to a stopped process\n");
1359 /* The process is definitely stopped. It is in a job control
1360 stop, unless the kernel predates the TASK_STOPPED /
1361 TASK_TRACED distinction, in which case it might be in a
1362 ptrace stop. Make sure it is in a ptrace stop; from there we
1363 can kill it, signal it, et cetera.
1365 First make sure there is a pending SIGSTOP. Since we are
1366 already attached, the process can not transition from stopped
1367 to running without a PTRACE_CONT; so we know this signal will
1368 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1369 probably already in the queue (unless this kernel is old
1370 enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP
1371 is not an RT signal, it can only be queued once. */
1372 kill_lwp (pid
, SIGSTOP
);
1374 /* Finally, resume the stopped process. This will deliver the SIGSTOP
1375 (or a higher priority signal, just like normal PTRACE_ATTACH). */
1376 ptrace (PTRACE_CONT
, pid
, 0, 0);
1379 /* Make sure the initial process is stopped. The user-level threads
1380 layer might want to poke around in the inferior, and that won't
1381 work if things haven't stabilized yet. */
1382 new_pid
= my_waitpid (pid
, &status
, 0);
1383 if (new_pid
== -1 && errno
== ECHILD
)
1386 warning (_("%s is a cloned process"), target_pid_to_str (ptid
));
1388 /* Try again with __WCLONE to check cloned processes. */
1389 new_pid
= my_waitpid (pid
, &status
, __WCLONE
);
1393 gdb_assert (pid
== new_pid
);
1395 if (!WIFSTOPPED (status
))
1397 /* The pid we tried to attach has apparently just exited. */
1398 if (debug_linux_nat
)
1399 fprintf_unfiltered (gdb_stdlog
, "LNPAW: Failed to stop %d: %s",
1400 pid
, status_to_str (status
));
1404 if (WSTOPSIG (status
) != SIGSTOP
)
1407 if (debug_linux_nat
)
1408 fprintf_unfiltered (gdb_stdlog
,
1409 "LNPAW: Received %s after attaching\n",
1410 status_to_str (status
));
1416 /* Attach to the LWP specified by PID. Return 0 if successful or -1
1417 if the new LWP could not be attached. */
1420 lin_lwp_attach_lwp (ptid_t ptid
)
1422 struct lwp_info
*lp
;
1425 gdb_assert (is_lwp (ptid
));
1427 block_child_signals (&prev_mask
);
1429 lp
= find_lwp_pid (ptid
);
1431 /* We assume that we're already attached to any LWP that has an id
1432 equal to the overall process id, and to any LWP that is already
1433 in our list of LWPs. If we're not seeing exit events from threads
1434 and we've had PID wraparound since we last tried to stop all threads,
1435 this assumption might be wrong; fortunately, this is very unlikely
1437 if (GET_LWP (ptid
) != GET_PID (ptid
) && lp
== NULL
)
1439 int status
, cloned
= 0, signalled
= 0;
1441 if (ptrace (PTRACE_ATTACH
, GET_LWP (ptid
), 0, 0) < 0)
1443 /* If we fail to attach to the thread, issue a warning,
1444 but continue. One way this can happen is if thread
1445 creation is interrupted; as of Linux kernel 2.6.19, a
1446 bug may place threads in the thread list and then fail
1448 warning (_("Can't attach %s: %s"), target_pid_to_str (ptid
),
1449 safe_strerror (errno
));
1450 restore_child_signals_mask (&prev_mask
);
1454 if (debug_linux_nat
)
1455 fprintf_unfiltered (gdb_stdlog
,
1456 "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
1457 target_pid_to_str (ptid
));
1459 status
= linux_nat_post_attach_wait (ptid
, 0, &cloned
, &signalled
);
1460 if (!WIFSTOPPED (status
))
1463 lp
= add_lwp (ptid
);
1465 lp
->cloned
= cloned
;
1466 lp
->signalled
= signalled
;
1467 if (WSTOPSIG (status
) != SIGSTOP
)
1470 lp
->status
= status
;
1473 target_post_attach (GET_LWP (lp
->ptid
));
1475 if (debug_linux_nat
)
1477 fprintf_unfiltered (gdb_stdlog
,
1478 "LLAL: waitpid %s received %s\n",
1479 target_pid_to_str (ptid
),
1480 status_to_str (status
));
1485 /* We assume that the LWP representing the original process is
1486 already stopped. Mark it as stopped in the data structure
1487 that the GNU/linux ptrace layer uses to keep track of
1488 threads. Note that this won't have already been done since
1489 the main thread will have, we assume, been stopped by an
1490 attach from a different layer. */
1492 lp
= add_lwp (ptid
);
1496 restore_child_signals_mask (&prev_mask
);
1501 linux_nat_create_inferior (struct target_ops
*ops
,
1502 char *exec_file
, char *allargs
, char **env
,
1505 #ifdef HAVE_PERSONALITY
1506 int personality_orig
= 0, personality_set
= 0;
1507 #endif /* HAVE_PERSONALITY */
1509 /* The fork_child mechanism is synchronous and calls target_wait, so
1510 we have to mask the async mode. */
1512 #ifdef HAVE_PERSONALITY
1513 if (disable_randomization
)
1516 personality_orig
= personality (0xffffffff);
1517 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
1519 personality_set
= 1;
1520 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
1522 if (errno
!= 0 || (personality_set
1523 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
1524 warning (_("Error disabling address space randomization: %s"),
1525 safe_strerror (errno
));
1527 #endif /* HAVE_PERSONALITY */
1529 /* Make sure we report all signals during startup. */
1530 linux_nat_pass_signals (0, NULL
);
1532 linux_ops
->to_create_inferior (ops
, exec_file
, allargs
, env
, from_tty
);
1534 #ifdef HAVE_PERSONALITY
1535 if (personality_set
)
1538 personality (personality_orig
);
1540 warning (_("Error restoring address space randomization: %s"),
1541 safe_strerror (errno
));
1543 #endif /* HAVE_PERSONALITY */
1547 linux_nat_attach (struct target_ops
*ops
, char *args
, int from_tty
)
1549 struct lwp_info
*lp
;
1553 /* Make sure we report all signals during attach. */
1554 linux_nat_pass_signals (0, NULL
);
1556 linux_ops
->to_attach (ops
, args
, from_tty
);
1558 /* The ptrace base target adds the main thread with (pid,0,0)
1559 format. Decorate it with lwp info. */
1560 ptid
= BUILD_LWP (GET_PID (inferior_ptid
), GET_PID (inferior_ptid
));
1561 thread_change_ptid (inferior_ptid
, ptid
);
1563 /* Add the initial process as the first LWP to the list. */
1564 lp
= add_lwp (ptid
);
1566 status
= linux_nat_post_attach_wait (lp
->ptid
, 1, &lp
->cloned
,
1568 if (!WIFSTOPPED (status
))
1570 if (WIFEXITED (status
))
1572 int exit_code
= WEXITSTATUS (status
);
1574 target_terminal_ours ();
1575 target_mourn_inferior ();
1577 error (_("Unable to attach: program exited normally."));
1579 error (_("Unable to attach: program exited with code %d."),
1582 else if (WIFSIGNALED (status
))
1584 enum target_signal signo
;
1586 target_terminal_ours ();
1587 target_mourn_inferior ();
1589 signo
= target_signal_from_host (WTERMSIG (status
));
1590 error (_("Unable to attach: program terminated with signal "
1592 target_signal_to_name (signo
),
1593 target_signal_to_string (signo
));
1596 internal_error (__FILE__
, __LINE__
,
1597 _("unexpected status %d for PID %ld"),
1598 status
, (long) GET_LWP (ptid
));
1603 /* Save the wait status to report later. */
1605 if (debug_linux_nat
)
1606 fprintf_unfiltered (gdb_stdlog
,
1607 "LNA: waitpid %ld, saving status %s\n",
1608 (long) GET_PID (lp
->ptid
), status_to_str (status
));
1610 lp
->status
= status
;
1612 if (target_can_async_p ())
1613 target_async (inferior_event_handler
, 0);
1616 /* Get pending status of LP. */
1618 get_pending_status (struct lwp_info
*lp
, int *status
)
1620 enum target_signal signo
= TARGET_SIGNAL_0
;
1622 /* If we paused threads momentarily, we may have stored pending
1623 events in lp->status or lp->waitstatus (see stop_wait_callback),
1624 and GDB core hasn't seen any signal for those threads.
1625 Otherwise, the last signal reported to the core is found in the
1626 thread object's stop_signal.
1628 There's a corner case that isn't handled here at present. Only
1629 if the thread stopped with a TARGET_WAITKIND_STOPPED does
1630 stop_signal make sense as a real signal to pass to the inferior.
1631 Some catchpoint related events, like
1632 TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set
1633 to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But,
1634 those traps are debug API (ptrace in our case) related and
1635 induced; the inferior wouldn't see them if it wasn't being
1636 traced. Hence, we should never pass them to the inferior, even
1637 when set to pass state. Since this corner case isn't handled by
1638 infrun.c when proceeding with a signal, for consistency, neither
1639 do we handle it here (or elsewhere in the file we check for
1640 signal pass state). Normally SIGTRAP isn't set to pass state, so
1641 this is really a corner case. */
1643 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1644 signo
= TARGET_SIGNAL_0
; /* a pending ptrace event, not a real signal. */
1645 else if (lp
->status
)
1646 signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1647 else if (non_stop
&& !is_executing (lp
->ptid
))
1649 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1651 signo
= tp
->suspend
.stop_signal
;
1655 struct target_waitstatus last
;
1658 get_last_target_status (&last_ptid
, &last
);
1660 if (GET_LWP (lp
->ptid
) == GET_LWP (last_ptid
))
1662 struct thread_info
*tp
= find_thread_ptid (lp
->ptid
);
1664 signo
= tp
->suspend
.stop_signal
;
1670 if (signo
== TARGET_SIGNAL_0
)
1672 if (debug_linux_nat
)
1673 fprintf_unfiltered (gdb_stdlog
,
1674 "GPT: lwp %s has no pending signal\n",
1675 target_pid_to_str (lp
->ptid
));
1677 else if (!signal_pass_state (signo
))
1679 if (debug_linux_nat
)
1680 fprintf_unfiltered (gdb_stdlog
,
1681 "GPT: lwp %s had signal %s, "
1682 "but it is in no pass state\n",
1683 target_pid_to_str (lp
->ptid
),
1684 target_signal_to_string (signo
));
1688 *status
= W_STOPCODE (target_signal_to_host (signo
));
1690 if (debug_linux_nat
)
1691 fprintf_unfiltered (gdb_stdlog
,
1692 "GPT: lwp %s has pending signal %s\n",
1693 target_pid_to_str (lp
->ptid
),
1694 target_signal_to_string (signo
));
1701 detach_callback (struct lwp_info
*lp
, void *data
)
1703 gdb_assert (lp
->status
== 0 || WIFSTOPPED (lp
->status
));
1705 if (debug_linux_nat
&& lp
->status
)
1706 fprintf_unfiltered (gdb_stdlog
, "DC: Pending %s for %s on detach.\n",
1707 strsignal (WSTOPSIG (lp
->status
)),
1708 target_pid_to_str (lp
->ptid
));
1710 /* If there is a pending SIGSTOP, get rid of it. */
1713 if (debug_linux_nat
)
1714 fprintf_unfiltered (gdb_stdlog
,
1715 "DC: Sending SIGCONT to %s\n",
1716 target_pid_to_str (lp
->ptid
));
1718 kill_lwp (GET_LWP (lp
->ptid
), SIGCONT
);
1722 /* We don't actually detach from the LWP that has an id equal to the
1723 overall process id just yet. */
1724 if (GET_LWP (lp
->ptid
) != GET_PID (lp
->ptid
))
1728 /* Pass on any pending signal for this LWP. */
1729 get_pending_status (lp
, &status
);
1732 if (ptrace (PTRACE_DETACH
, GET_LWP (lp
->ptid
), 0,
1733 WSTOPSIG (status
)) < 0)
1734 error (_("Can't detach %s: %s"), target_pid_to_str (lp
->ptid
),
1735 safe_strerror (errno
));
1737 if (debug_linux_nat
)
1738 fprintf_unfiltered (gdb_stdlog
,
1739 "PTRACE_DETACH (%s, %s, 0) (OK)\n",
1740 target_pid_to_str (lp
->ptid
),
1741 strsignal (WSTOPSIG (status
)));
1743 delete_lwp (lp
->ptid
);
1750 linux_nat_detach (struct target_ops
*ops
, char *args
, int from_tty
)
1754 struct lwp_info
*main_lwp
;
1756 pid
= GET_PID (inferior_ptid
);
1758 if (target_can_async_p ())
1759 linux_nat_async (NULL
, 0);
1761 /* Stop all threads before detaching. ptrace requires that the
1762 thread is stopped to sucessfully detach. */
1763 iterate_over_lwps (pid_to_ptid (pid
), stop_callback
, NULL
);
1764 /* ... and wait until all of them have reported back that
1765 they're no longer running. */
1766 iterate_over_lwps (pid_to_ptid (pid
), stop_wait_callback
, NULL
);
1768 iterate_over_lwps (pid_to_ptid (pid
), detach_callback
, NULL
);
1770 /* Only the initial process should be left right now. */
1771 gdb_assert (num_lwps (GET_PID (inferior_ptid
)) == 1);
1773 main_lwp
= find_lwp_pid (pid_to_ptid (pid
));
1775 /* Pass on any pending signal for the last LWP. */
1776 if ((args
== NULL
|| *args
== '\0')
1777 && get_pending_status (main_lwp
, &status
) != -1
1778 && WIFSTOPPED (status
))
1780 /* Put the signal number in ARGS so that inf_ptrace_detach will
1781 pass it along with PTRACE_DETACH. */
1783 sprintf (args
, "%d", (int) WSTOPSIG (status
));
1784 if (debug_linux_nat
)
1785 fprintf_unfiltered (gdb_stdlog
,
1786 "LND: Sending signal %s to %s\n",
1788 target_pid_to_str (main_lwp
->ptid
));
1791 delete_lwp (main_lwp
->ptid
);
1793 if (forks_exist_p ())
1795 /* Multi-fork case. The current inferior_ptid is being detached
1796 from, but there are other viable forks to debug. Detach from
1797 the current fork, and context-switch to the first
1799 linux_fork_detach (args
, from_tty
);
1801 if (non_stop
&& target_can_async_p ())
1802 target_async (inferior_event_handler
, 0);
1805 linux_ops
->to_detach (ops
, args
, from_tty
);
1811 resume_callback (struct lwp_info
*lp
, void *data
)
1813 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
1815 if (lp
->stopped
&& inf
->vfork_child
!= NULL
)
1817 if (debug_linux_nat
)
1818 fprintf_unfiltered (gdb_stdlog
,
1819 "RC: Not resuming %s (vfork parent)\n",
1820 target_pid_to_str (lp
->ptid
));
1822 else if (lp
->stopped
&& lp
->status
== 0)
1824 if (debug_linux_nat
)
1825 fprintf_unfiltered (gdb_stdlog
,
1826 "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n",
1827 target_pid_to_str (lp
->ptid
));
1829 linux_ops
->to_resume (linux_ops
,
1830 pid_to_ptid (GET_LWP (lp
->ptid
)),
1831 0, TARGET_SIGNAL_0
);
1832 if (debug_linux_nat
)
1833 fprintf_unfiltered (gdb_stdlog
,
1834 "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
1835 target_pid_to_str (lp
->ptid
));
1838 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1839 lp
->stopped_by_watchpoint
= 0;
1841 else if (lp
->stopped
&& debug_linux_nat
)
1842 fprintf_unfiltered (gdb_stdlog
,
1843 "RC: Not resuming sibling %s (has pending)\n",
1844 target_pid_to_str (lp
->ptid
));
1845 else if (debug_linux_nat
)
1846 fprintf_unfiltered (gdb_stdlog
,
1847 "RC: Not resuming sibling %s (not stopped)\n",
1848 target_pid_to_str (lp
->ptid
));
1854 resume_clear_callback (struct lwp_info
*lp
, void *data
)
1861 resume_set_callback (struct lwp_info
*lp
, void *data
)
1868 linux_nat_resume (struct target_ops
*ops
,
1869 ptid_t ptid
, int step
, enum target_signal signo
)
1872 struct lwp_info
*lp
;
1875 if (debug_linux_nat
)
1876 fprintf_unfiltered (gdb_stdlog
,
1877 "LLR: Preparing to %s %s, %s, inferior_ptid %s\n",
1878 step
? "step" : "resume",
1879 target_pid_to_str (ptid
),
1880 (signo
!= TARGET_SIGNAL_0
1881 ? strsignal (target_signal_to_host (signo
)) : "0"),
1882 target_pid_to_str (inferior_ptid
));
1884 block_child_signals (&prev_mask
);
1886 /* A specific PTID means `step only this process id'. */
1887 resume_many
= (ptid_equal (minus_one_ptid
, ptid
)
1888 || ptid_is_pid (ptid
));
1890 /* Mark the lwps we're resuming as resumed. */
1891 iterate_over_lwps (ptid
, resume_set_callback
, NULL
);
1893 /* See if it's the current inferior that should be handled
1896 lp
= find_lwp_pid (inferior_ptid
);
1898 lp
= find_lwp_pid (ptid
);
1899 gdb_assert (lp
!= NULL
);
1901 /* Remember if we're stepping. */
1904 /* If we have a pending wait status for this thread, there is no
1905 point in resuming the process. But first make sure that
1906 linux_nat_wait won't preemptively handle the event - we
1907 should never take this short-circuit if we are going to
1908 leave LP running, since we have skipped resuming all the
1909 other threads. This bit of code needs to be synchronized
1910 with linux_nat_wait. */
1912 if (lp
->status
&& WIFSTOPPED (lp
->status
))
1915 && WSTOPSIG (lp
->status
)
1916 && sigismember (&pass_mask
, WSTOPSIG (lp
->status
)))
1918 if (debug_linux_nat
)
1919 fprintf_unfiltered (gdb_stdlog
,
1920 "LLR: Not short circuiting for ignored "
1921 "status 0x%x\n", lp
->status
);
1923 /* FIXME: What should we do if we are supposed to continue
1924 this thread with a signal? */
1925 gdb_assert (signo
== TARGET_SIGNAL_0
);
1926 signo
= target_signal_from_host (WSTOPSIG (lp
->status
));
1931 if (lp
->status
|| lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
1933 /* FIXME: What should we do if we are supposed to continue
1934 this thread with a signal? */
1935 gdb_assert (signo
== TARGET_SIGNAL_0
);
1937 if (debug_linux_nat
)
1938 fprintf_unfiltered (gdb_stdlog
,
1939 "LLR: Short circuiting for status 0x%x\n",
1942 restore_child_signals_mask (&prev_mask
);
1943 if (target_can_async_p ())
1945 target_async (inferior_event_handler
, 0);
1946 /* Tell the event loop we have something to process. */
1952 /* Mark LWP as not stopped to prevent it from being continued by
1957 iterate_over_lwps (ptid
, resume_callback
, NULL
);
1959 /* Convert to something the lower layer understands. */
1960 ptid
= pid_to_ptid (GET_LWP (lp
->ptid
));
1962 linux_ops
->to_resume (linux_ops
, ptid
, step
, signo
);
1963 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
1964 lp
->stopped_by_watchpoint
= 0;
1966 if (debug_linux_nat
)
1967 fprintf_unfiltered (gdb_stdlog
,
1968 "LLR: %s %s, %s (resume event thread)\n",
1969 step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
1970 target_pid_to_str (ptid
),
1971 (signo
!= TARGET_SIGNAL_0
1972 ? strsignal (target_signal_to_host (signo
)) : "0"));
1974 restore_child_signals_mask (&prev_mask
);
1975 if (target_can_async_p ())
1976 target_async (inferior_event_handler
, 0);
1979 /* Send a signal to an LWP. */
1982 kill_lwp (int lwpid
, int signo
)
1984 /* Use tkill, if possible, in case we are using nptl threads. If tkill
1985 fails, then we are not using nptl threads and we should be using kill. */
1987 #ifdef HAVE_TKILL_SYSCALL
1989 static int tkill_failed
;
1996 ret
= syscall (__NR_tkill
, lwpid
, signo
);
1997 if (errno
!= ENOSYS
)
2004 return kill (lwpid
, signo
);
2007 /* Handle a GNU/Linux syscall trap wait response. If we see a syscall
2008 event, check if the core is interested in it: if not, ignore the
2009 event, and keep waiting; otherwise, we need to toggle the LWP's
2010 syscall entry/exit status, since the ptrace event itself doesn't
2011 indicate it, and report the trap to higher layers. */
2014 linux_handle_syscall_trap (struct lwp_info
*lp
, int stopping
)
2016 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2017 struct gdbarch
*gdbarch
= target_thread_architecture (lp
->ptid
);
2018 int syscall_number
= (int) gdbarch_get_syscall_number (gdbarch
, lp
->ptid
);
2022 /* If we're stopping threads, there's a SIGSTOP pending, which
2023 makes it so that the LWP reports an immediate syscall return,
2024 followed by the SIGSTOP. Skip seeing that "return" using
2025 PTRACE_CONT directly, and let stop_wait_callback collect the
2026 SIGSTOP. Later when the thread is resumed, a new syscall
2027 entry event. If we didn't do this (and returned 0), we'd
2028 leave a syscall entry pending, and our caller, by using
2029 PTRACE_CONT to collect the SIGSTOP, skips the syscall return
2030 itself. Later, when the user re-resumes this LWP, we'd see
2031 another syscall entry event and we'd mistake it for a return.
2033 If stop_wait_callback didn't force the SIGSTOP out of the LWP
2034 (leaving immediately with LWP->signalled set, without issuing
2035 a PTRACE_CONT), it would still be problematic to leave this
2036 syscall enter pending, as later when the thread is resumed,
2037 it would then see the same syscall exit mentioned above,
2038 followed by the delayed SIGSTOP, while the syscall didn't
2039 actually get to execute. It seems it would be even more
2040 confusing to the user. */
2042 if (debug_linux_nat
)
2043 fprintf_unfiltered (gdb_stdlog
,
2044 "LHST: ignoring syscall %d "
2045 "for LWP %ld (stopping threads), "
2046 "resuming with PTRACE_CONT for SIGSTOP\n",
2048 GET_LWP (lp
->ptid
));
2050 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2051 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2055 if (catch_syscall_enabled ())
2057 /* Always update the entry/return state, even if this particular
2058 syscall isn't interesting to the core now. In async mode,
2059 the user could install a new catchpoint for this syscall
2060 between syscall enter/return, and we'll need to know to
2061 report a syscall return if that happens. */
2062 lp
->syscall_state
= (lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2063 ? TARGET_WAITKIND_SYSCALL_RETURN
2064 : TARGET_WAITKIND_SYSCALL_ENTRY
);
2066 if (catching_syscall_number (syscall_number
))
2068 /* Alright, an event to report. */
2069 ourstatus
->kind
= lp
->syscall_state
;
2070 ourstatus
->value
.syscall_number
= syscall_number
;
2072 if (debug_linux_nat
)
2073 fprintf_unfiltered (gdb_stdlog
,
2074 "LHST: stopping for %s of syscall %d"
2077 == TARGET_WAITKIND_SYSCALL_ENTRY
2078 ? "entry" : "return",
2080 GET_LWP (lp
->ptid
));
2084 if (debug_linux_nat
)
2085 fprintf_unfiltered (gdb_stdlog
,
2086 "LHST: ignoring %s of syscall %d "
2088 lp
->syscall_state
== TARGET_WAITKIND_SYSCALL_ENTRY
2089 ? "entry" : "return",
2091 GET_LWP (lp
->ptid
));
2095 /* If we had been syscall tracing, and hence used PT_SYSCALL
2096 before on this LWP, it could happen that the user removes all
2097 syscall catchpoints before we get to process this event.
2098 There are two noteworthy issues here:
2100 - When stopped at a syscall entry event, resuming with
2101 PT_STEP still resumes executing the syscall and reports a
2104 - Only PT_SYSCALL catches syscall enters. If we last
2105 single-stepped this thread, then this event can't be a
2106 syscall enter. If we last single-stepped this thread, this
2107 has to be a syscall exit.
2109 The points above mean that the next resume, be it PT_STEP or
2110 PT_CONTINUE, can not trigger a syscall trace event. */
2111 if (debug_linux_nat
)
2112 fprintf_unfiltered (gdb_stdlog
,
2113 "LHST: caught syscall event "
2114 "with no syscall catchpoints."
2115 " %d for LWP %ld, ignoring\n",
2117 GET_LWP (lp
->ptid
));
2118 lp
->syscall_state
= TARGET_WAITKIND_IGNORE
;
2121 /* The core isn't interested in this event. For efficiency, avoid
2122 stopping all threads only to have the core resume them all again.
2123 Since we're not stopping threads, if we're still syscall tracing
2124 and not stepping, we can't use PTRACE_CONT here, as we'd miss any
2125 subsequent syscall. Simply resume using the inf-ptrace layer,
2126 which knows when to use PT_SYSCALL or PT_CONTINUE. */
2128 /* Note that gdbarch_get_syscall_number may access registers, hence
2130 registers_changed ();
2131 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2132 lp
->step
, TARGET_SIGNAL_0
);
2136 /* Handle a GNU/Linux extended wait response. If we see a clone
2137 event, we need to add the new LWP to our list (and not report the
2138 trap to higher layers). This function returns non-zero if the
2139 event should be ignored and we should wait again. If STOPPING is
2140 true, the new LWP remains stopped, otherwise it is continued. */
2143 linux_handle_extended_wait (struct lwp_info
*lp
, int status
,
2146 int pid
= GET_LWP (lp
->ptid
);
2147 struct target_waitstatus
*ourstatus
= &lp
->waitstatus
;
2148 int event
= status
>> 16;
2150 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
2151 || event
== PTRACE_EVENT_CLONE
)
2153 unsigned long new_pid
;
2156 ptrace (PTRACE_GETEVENTMSG
, pid
, 0, &new_pid
);
2158 /* If we haven't already seen the new PID stop, wait for it now. */
2159 if (! pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
2161 /* The new child has a pending SIGSTOP. We can't affect it until it
2162 hits the SIGSTOP, but we're already attached. */
2163 ret
= my_waitpid (new_pid
, &status
,
2164 (event
== PTRACE_EVENT_CLONE
) ? __WCLONE
: 0);
2166 perror_with_name (_("waiting for new child"));
2167 else if (ret
!= new_pid
)
2168 internal_error (__FILE__
, __LINE__
,
2169 _("wait returned unexpected PID %d"), ret
);
2170 else if (!WIFSTOPPED (status
))
2171 internal_error (__FILE__
, __LINE__
,
2172 _("wait returned unexpected status 0x%x"), status
);
2175 ourstatus
->value
.related_pid
= ptid_build (new_pid
, new_pid
, 0);
2177 if (event
== PTRACE_EVENT_FORK
2178 && linux_fork_checkpointing_p (GET_PID (lp
->ptid
)))
2180 /* Handle checkpointing by linux-fork.c here as a special
2181 case. We don't want the follow-fork-mode or 'catch fork'
2182 to interfere with this. */
2184 /* This won't actually modify the breakpoint list, but will
2185 physically remove the breakpoints from the child. */
2186 detach_breakpoints (new_pid
);
2188 /* Retain child fork in ptrace (stopped) state. */
2189 if (!find_fork_pid (new_pid
))
2192 /* Report as spurious, so that infrun doesn't want to follow
2193 this fork. We're actually doing an infcall in
2195 ourstatus
->kind
= TARGET_WAITKIND_SPURIOUS
;
2196 linux_enable_event_reporting (pid_to_ptid (new_pid
));
2198 /* Report the stop to the core. */
2202 if (event
== PTRACE_EVENT_FORK
)
2203 ourstatus
->kind
= TARGET_WAITKIND_FORKED
;
2204 else if (event
== PTRACE_EVENT_VFORK
)
2205 ourstatus
->kind
= TARGET_WAITKIND_VFORKED
;
2208 struct lwp_info
*new_lp
;
2210 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2212 new_lp
= add_lwp (BUILD_LWP (new_pid
, GET_PID (lp
->ptid
)));
2214 new_lp
->stopped
= 1;
2216 if (WSTOPSIG (status
) != SIGSTOP
)
2218 /* This can happen if someone starts sending signals to
2219 the new thread before it gets a chance to run, which
2220 have a lower number than SIGSTOP (e.g. SIGUSR1).
2221 This is an unlikely case, and harder to handle for
2222 fork / vfork than for clone, so we do not try - but
2223 we handle it for clone events here. We'll send
2224 the other signal on to the thread below. */
2226 new_lp
->signalled
= 1;
2233 /* Add the new thread to GDB's lists as soon as possible
2236 1) the frontend doesn't have to wait for a stop to
2239 2) we tag it with the correct running state. */
2241 /* If the thread_db layer is active, let it know about
2242 this new thread, and add it to GDB's list. */
2243 if (!thread_db_attach_lwp (new_lp
->ptid
))
2245 /* We're not using thread_db. Add it to GDB's
2247 target_post_attach (GET_LWP (new_lp
->ptid
));
2248 add_thread (new_lp
->ptid
);
2253 set_running (new_lp
->ptid
, 1);
2254 set_executing (new_lp
->ptid
, 1);
2258 /* Note the need to use the low target ops to resume, to
2259 handle resuming with PT_SYSCALL if we have syscall
2263 enum target_signal signo
;
2265 new_lp
->stopped
= 0;
2266 new_lp
->resumed
= 1;
2269 ? target_signal_from_host (WSTOPSIG (status
))
2272 linux_ops
->to_resume (linux_ops
, pid_to_ptid (new_pid
),
2279 /* We created NEW_LP so it cannot yet contain STATUS. */
2280 gdb_assert (new_lp
->status
== 0);
2282 /* Save the wait status to report later. */
2283 if (debug_linux_nat
)
2284 fprintf_unfiltered (gdb_stdlog
,
2285 "LHEW: waitpid of new LWP %ld, "
2286 "saving status %s\n",
2287 (long) GET_LWP (new_lp
->ptid
),
2288 status_to_str (status
));
2289 new_lp
->status
= status
;
2293 if (debug_linux_nat
)
2294 fprintf_unfiltered (gdb_stdlog
,
2295 "LHEW: Got clone event "
2296 "from LWP %ld, resuming\n",
2297 GET_LWP (lp
->ptid
));
2298 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
2299 0, TARGET_SIGNAL_0
);
2307 if (event
== PTRACE_EVENT_EXEC
)
2309 if (debug_linux_nat
)
2310 fprintf_unfiltered (gdb_stdlog
,
2311 "LHEW: Got exec event from LWP %ld\n",
2312 GET_LWP (lp
->ptid
));
2314 ourstatus
->kind
= TARGET_WAITKIND_EXECD
;
2315 ourstatus
->value
.execd_pathname
2316 = xstrdup (linux_child_pid_to_exec_file (pid
));
2321 if (event
== PTRACE_EVENT_VFORK_DONE
)
2323 if (current_inferior ()->waiting_for_vfork_done
)
2325 if (debug_linux_nat
)
2326 fprintf_unfiltered (gdb_stdlog
,
2327 "LHEW: Got expected PTRACE_EVENT_"
2328 "VFORK_DONE from LWP %ld: stopping\n",
2329 GET_LWP (lp
->ptid
));
2331 ourstatus
->kind
= TARGET_WAITKIND_VFORK_DONE
;
2335 if (debug_linux_nat
)
2336 fprintf_unfiltered (gdb_stdlog
,
2337 "LHEW: Got PTRACE_EVENT_VFORK_DONE "
2338 "from LWP %ld: resuming\n",
2339 GET_LWP (lp
->ptid
));
2340 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2344 internal_error (__FILE__
, __LINE__
,
2345 _("unknown ptrace event %d"), event
);
2348 /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
2352 wait_lwp (struct lwp_info
*lp
)
2356 int thread_dead
= 0;
2358 gdb_assert (!lp
->stopped
);
2359 gdb_assert (lp
->status
== 0);
2361 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, 0);
2362 if (pid
== -1 && errno
== ECHILD
)
2364 pid
= my_waitpid (GET_LWP (lp
->ptid
), &status
, __WCLONE
);
2365 if (pid
== -1 && errno
== ECHILD
)
2367 /* The thread has previously exited. We need to delete it
2368 now because, for some vendor 2.4 kernels with NPTL
2369 support backported, there won't be an exit event unless
2370 it is the main thread. 2.6 kernels will report an exit
2371 event for each thread that exits, as expected. */
2373 if (debug_linux_nat
)
2374 fprintf_unfiltered (gdb_stdlog
, "WL: %s vanished.\n",
2375 target_pid_to_str (lp
->ptid
));
2381 gdb_assert (pid
== GET_LWP (lp
->ptid
));
2383 if (debug_linux_nat
)
2385 fprintf_unfiltered (gdb_stdlog
,
2386 "WL: waitpid %s received %s\n",
2387 target_pid_to_str (lp
->ptid
),
2388 status_to_str (status
));
2392 /* Check if the thread has exited. */
2393 if (WIFEXITED (status
) || WIFSIGNALED (status
))
2396 if (debug_linux_nat
)
2397 fprintf_unfiltered (gdb_stdlog
, "WL: %s exited.\n",
2398 target_pid_to_str (lp
->ptid
));
2407 gdb_assert (WIFSTOPPED (status
));
2409 /* Handle GNU/Linux's syscall SIGTRAPs. */
2410 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
2412 /* No longer need the sysgood bit. The ptrace event ends up
2413 recorded in lp->waitstatus if we care for it. We can carry
2414 on handling the event like a regular SIGTRAP from here
2416 status
= W_STOPCODE (SIGTRAP
);
2417 if (linux_handle_syscall_trap (lp
, 1))
2418 return wait_lwp (lp
);
2421 /* Handle GNU/Linux's extended waitstatus for trace events. */
2422 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
2424 if (debug_linux_nat
)
2425 fprintf_unfiltered (gdb_stdlog
,
2426 "WL: Handling extended status 0x%06x\n",
2428 if (linux_handle_extended_wait (lp
, status
, 1))
2429 return wait_lwp (lp
);
2435 /* Save the most recent siginfo for LP. This is currently only called
2436 for SIGTRAP; some ports use the si_addr field for
2437 target_stopped_data_address. In the future, it may also be used to
2438 restore the siginfo of requeued signals. */
2441 save_siginfo (struct lwp_info
*lp
)
2444 ptrace (PTRACE_GETSIGINFO
, GET_LWP (lp
->ptid
),
2445 (PTRACE_TYPE_ARG3
) 0, &lp
->siginfo
);
2448 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
2451 /* Send a SIGSTOP to LP. */
2454 stop_callback (struct lwp_info
*lp
, void *data
)
2456 if (!lp
->stopped
&& !lp
->signalled
)
2460 if (debug_linux_nat
)
2462 fprintf_unfiltered (gdb_stdlog
,
2463 "SC: kill %s **<SIGSTOP>**\n",
2464 target_pid_to_str (lp
->ptid
));
2467 ret
= kill_lwp (GET_LWP (lp
->ptid
), SIGSTOP
);
2468 if (debug_linux_nat
)
2470 fprintf_unfiltered (gdb_stdlog
,
2471 "SC: lwp kill %d %s\n",
2473 errno
? safe_strerror (errno
) : "ERRNO-OK");
2477 gdb_assert (lp
->status
== 0);
2483 /* Return non-zero if LWP PID has a pending SIGINT. */
2486 linux_nat_has_pending_sigint (int pid
)
2488 sigset_t pending
, blocked
, ignored
;
2490 linux_proc_pending_signals (pid
, &pending
, &blocked
, &ignored
);
2492 if (sigismember (&pending
, SIGINT
)
2493 && !sigismember (&ignored
, SIGINT
))
2499 /* Set a flag in LP indicating that we should ignore its next SIGINT. */
2502 set_ignore_sigint (struct lwp_info
*lp
, void *data
)
2504 /* If a thread has a pending SIGINT, consume it; otherwise, set a
2505 flag to consume the next one. */
2506 if (lp
->stopped
&& lp
->status
!= 0 && WIFSTOPPED (lp
->status
)
2507 && WSTOPSIG (lp
->status
) == SIGINT
)
2510 lp
->ignore_sigint
= 1;
2515 /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag.
2516 This function is called after we know the LWP has stopped; if the LWP
2517 stopped before the expected SIGINT was delivered, then it will never have
2518 arrived. Also, if the signal was delivered to a shared queue and consumed
2519 by a different thread, it will never be delivered to this LWP. */
2522 maybe_clear_ignore_sigint (struct lwp_info
*lp
)
2524 if (!lp
->ignore_sigint
)
2527 if (!linux_nat_has_pending_sigint (GET_LWP (lp
->ptid
)))
2529 if (debug_linux_nat
)
2530 fprintf_unfiltered (gdb_stdlog
,
2531 "MCIS: Clearing bogus flag for %s\n",
2532 target_pid_to_str (lp
->ptid
));
2533 lp
->ignore_sigint
= 0;
2537 /* Fetch the possible triggered data watchpoint info and store it in
2540 On some archs, like x86, that use debug registers to set
2541 watchpoints, it's possible that the way to know which watched
2542 address trapped, is to check the register that is used to select
2543 which address to watch. Problem is, between setting the watchpoint
2544 and reading back which data address trapped, the user may change
2545 the set of watchpoints, and, as a consequence, GDB changes the
2546 debug registers in the inferior. To avoid reading back a stale
2547 stopped-data-address when that happens, we cache in LP the fact
2548 that a watchpoint trapped, and the corresponding data address, as
2549 soon as we see LP stop with a SIGTRAP. If GDB changes the debug
2550 registers meanwhile, we have the cached data we can rely on. */
2553 save_sigtrap (struct lwp_info
*lp
)
2555 struct cleanup
*old_chain
;
2557 if (linux_ops
->to_stopped_by_watchpoint
== NULL
)
2559 lp
->stopped_by_watchpoint
= 0;
2563 old_chain
= save_inferior_ptid ();
2564 inferior_ptid
= lp
->ptid
;
2566 lp
->stopped_by_watchpoint
= linux_ops
->to_stopped_by_watchpoint ();
2568 if (lp
->stopped_by_watchpoint
)
2570 if (linux_ops
->to_stopped_data_address
!= NULL
)
2571 lp
->stopped_data_address_p
=
2572 linux_ops
->to_stopped_data_address (¤t_target
,
2573 &lp
->stopped_data_address
);
2575 lp
->stopped_data_address_p
= 0;
2578 do_cleanups (old_chain
);
2581 /* See save_sigtrap. */
2584 linux_nat_stopped_by_watchpoint (void)
2586 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2588 gdb_assert (lp
!= NULL
);
2590 return lp
->stopped_by_watchpoint
;
2594 linux_nat_stopped_data_address (struct target_ops
*ops
, CORE_ADDR
*addr_p
)
2596 struct lwp_info
*lp
= find_lwp_pid (inferior_ptid
);
2598 gdb_assert (lp
!= NULL
);
2600 *addr_p
= lp
->stopped_data_address
;
2602 return lp
->stopped_data_address_p
;
2605 /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */
2608 sigtrap_is_event (int status
)
2610 return WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
;
2613 /* SIGTRAP-like events recognizer. */
2615 static int (*linux_nat_status_is_event
) (int status
) = sigtrap_is_event
;
2617 /* Check for SIGTRAP-like events in LP. */
2620 linux_nat_lp_status_is_event (struct lwp_info
*lp
)
2622 /* We check for lp->waitstatus in addition to lp->status, because we can
2623 have pending process exits recorded in lp->status
2624 and W_EXITCODE(0,0) == 0. We should probably have an additional
2625 lp->status_p flag. */
2627 return (lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
2628 && linux_nat_status_is_event (lp
->status
));
2631 /* Set alternative SIGTRAP-like events recognizer. If
2632 breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be
2636 linux_nat_set_status_is_event (struct target_ops
*t
,
2637 int (*status_is_event
) (int status
))
2639 linux_nat_status_is_event
= status_is_event
;
2642 /* Wait until LP is stopped. */
2645 stop_wait_callback (struct lwp_info
*lp
, void *data
)
2647 struct inferior
*inf
= find_inferior_pid (GET_PID (lp
->ptid
));
2649 /* If this is a vfork parent, bail out, it is not going to report
2650 any SIGSTOP until the vfork is done with. */
2651 if (inf
->vfork_child
!= NULL
)
2658 status
= wait_lwp (lp
);
2662 if (lp
->ignore_sigint
&& WIFSTOPPED (status
)
2663 && WSTOPSIG (status
) == SIGINT
)
2665 lp
->ignore_sigint
= 0;
2668 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2669 if (debug_linux_nat
)
2670 fprintf_unfiltered (gdb_stdlog
,
2671 "PTRACE_CONT %s, 0, 0 (%s) "
2672 "(discarding SIGINT)\n",
2673 target_pid_to_str (lp
->ptid
),
2674 errno
? safe_strerror (errno
) : "OK");
2676 return stop_wait_callback (lp
, NULL
);
2679 maybe_clear_ignore_sigint (lp
);
2681 if (WSTOPSIG (status
) != SIGSTOP
)
2683 if (linux_nat_status_is_event (status
))
2685 /* If a LWP other than the LWP that we're reporting an
2686 event for has hit a GDB breakpoint (as opposed to
2687 some random trap signal), then just arrange for it to
2688 hit it again later. We don't keep the SIGTRAP status
2689 and don't forward the SIGTRAP signal to the LWP. We
2690 will handle the current event, eventually we will
2691 resume all LWPs, and this one will get its breakpoint
2694 If we do not do this, then we run the risk that the
2695 user will delete or disable the breakpoint, but the
2696 thread will have already tripped on it. */
2698 /* Save the trap's siginfo in case we need it later. */
2703 /* Now resume this LWP and get the SIGSTOP event. */
2705 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2706 if (debug_linux_nat
)
2708 fprintf_unfiltered (gdb_stdlog
,
2709 "PTRACE_CONT %s, 0, 0 (%s)\n",
2710 target_pid_to_str (lp
->ptid
),
2711 errno
? safe_strerror (errno
) : "OK");
2713 fprintf_unfiltered (gdb_stdlog
,
2714 "SWC: Candidate SIGTRAP event in %s\n",
2715 target_pid_to_str (lp
->ptid
));
2717 /* Hold this event/waitstatus while we check to see if
2718 there are any more (we still want to get that SIGSTOP). */
2719 stop_wait_callback (lp
, NULL
);
2721 /* Hold the SIGTRAP for handling by linux_nat_wait. If
2722 there's another event, throw it back into the
2726 if (debug_linux_nat
)
2727 fprintf_unfiltered (gdb_stdlog
,
2728 "SWC: kill %s, %s\n",
2729 target_pid_to_str (lp
->ptid
),
2730 status_to_str ((int) status
));
2731 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
2734 /* Save the sigtrap event. */
2735 lp
->status
= status
;
2740 /* The thread was stopped with a signal other than
2741 SIGSTOP, and didn't accidentally trip a breakpoint. */
2743 if (debug_linux_nat
)
2745 fprintf_unfiltered (gdb_stdlog
,
2746 "SWC: Pending event %s in %s\n",
2747 status_to_str ((int) status
),
2748 target_pid_to_str (lp
->ptid
));
2750 /* Now resume this LWP and get the SIGSTOP event. */
2752 ptrace (PTRACE_CONT
, GET_LWP (lp
->ptid
), 0, 0);
2753 if (debug_linux_nat
)
2754 fprintf_unfiltered (gdb_stdlog
,
2755 "SWC: PTRACE_CONT %s, 0, 0 (%s)\n",
2756 target_pid_to_str (lp
->ptid
),
2757 errno
? safe_strerror (errno
) : "OK");
2759 /* Hold this event/waitstatus while we check to see if
2760 there are any more (we still want to get that SIGSTOP). */
2761 stop_wait_callback (lp
, NULL
);
2763 /* If the lp->status field is still empty, use it to
2764 hold this event. If not, then this event must be
2765 returned to the event queue of the LWP. */
2768 if (debug_linux_nat
)
2770 fprintf_unfiltered (gdb_stdlog
,
2771 "SWC: kill %s, %s\n",
2772 target_pid_to_str (lp
->ptid
),
2773 status_to_str ((int) status
));
2775 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (status
));
2778 lp
->status
= status
;
2784 /* We caught the SIGSTOP that we intended to catch, so
2785 there's no SIGSTOP pending. */
2794 /* Return non-zero if LP has a wait status pending. */
2797 status_callback (struct lwp_info
*lp
, void *data
)
2799 /* Only report a pending wait status if we pretend that this has
2800 indeed been resumed. */
2804 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
2806 /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event,
2807 or a pending process exit. Note that `W_EXITCODE(0,0) ==
2808 0', so a clean process exit can not be stored pending in
2809 lp->status, it is indistinguishable from
2810 no-pending-status. */
2814 if (lp
->status
!= 0)
2820 /* Return non-zero if LP isn't stopped. */
2823 running_callback (struct lwp_info
*lp
, void *data
)
2825 return (lp
->stopped
== 0 || (lp
->status
!= 0 && lp
->resumed
));
2828 /* Count the LWP's that have had events. */
2831 count_events_callback (struct lwp_info
*lp
, void *data
)
2835 gdb_assert (count
!= NULL
);
2837 /* Count only resumed LWPs that have a SIGTRAP event pending. */
2838 if (lp
->resumed
&& linux_nat_lp_status_is_event (lp
))
2844 /* Select the LWP (if any) that is currently being single-stepped. */
2847 select_singlestep_lwp_callback (struct lwp_info
*lp
, void *data
)
2849 if (lp
->step
&& lp
->status
!= 0)
2855 /* Select the Nth LWP that has had a SIGTRAP event. */
2858 select_event_lwp_callback (struct lwp_info
*lp
, void *data
)
2860 int *selector
= data
;
2862 gdb_assert (selector
!= NULL
);
2864 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2865 if (lp
->resumed
&& linux_nat_lp_status_is_event (lp
))
2866 if ((*selector
)-- == 0)
2873 cancel_breakpoint (struct lwp_info
*lp
)
2875 /* Arrange for a breakpoint to be hit again later. We don't keep
2876 the SIGTRAP status and don't forward the SIGTRAP signal to the
2877 LWP. We will handle the current event, eventually we will resume
2878 this LWP, and this breakpoint will trap again.
2880 If we do not do this, then we run the risk that the user will
2881 delete or disable the breakpoint, but the LWP will have already
2884 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
2885 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
2888 pc
= regcache_read_pc (regcache
) - gdbarch_decr_pc_after_break (gdbarch
);
2889 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
2891 if (debug_linux_nat
)
2892 fprintf_unfiltered (gdb_stdlog
,
2893 "CB: Push back breakpoint for %s\n",
2894 target_pid_to_str (lp
->ptid
));
2896 /* Back up the PC if necessary. */
2897 if (gdbarch_decr_pc_after_break (gdbarch
))
2898 regcache_write_pc (regcache
, pc
);
2906 cancel_breakpoints_callback (struct lwp_info
*lp
, void *data
)
2908 struct lwp_info
*event_lp
= data
;
2910 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2914 /* If a LWP other than the LWP that we're reporting an event for has
2915 hit a GDB breakpoint (as opposed to some random trap signal),
2916 then just arrange for it to hit it again later. We don't keep
2917 the SIGTRAP status and don't forward the SIGTRAP signal to the
2918 LWP. We will handle the current event, eventually we will resume
2919 all LWPs, and this one will get its breakpoint trap again.
2921 If we do not do this, then we run the risk that the user will
2922 delete or disable the breakpoint, but the LWP will have already
2925 if (linux_nat_lp_status_is_event (lp
)
2926 && cancel_breakpoint (lp
))
2927 /* Throw away the SIGTRAP. */
2933 /* Select one LWP out of those that have events pending. */
2936 select_event_lwp (ptid_t filter
, struct lwp_info
**orig_lp
, int *status
)
2939 int random_selector
;
2940 struct lwp_info
*event_lp
;
2942 /* Record the wait status for the original LWP. */
2943 (*orig_lp
)->status
= *status
;
2945 /* Give preference to any LWP that is being single-stepped. */
2946 event_lp
= iterate_over_lwps (filter
,
2947 select_singlestep_lwp_callback
, NULL
);
2948 if (event_lp
!= NULL
)
2950 if (debug_linux_nat
)
2951 fprintf_unfiltered (gdb_stdlog
,
2952 "SEL: Select single-step %s\n",
2953 target_pid_to_str (event_lp
->ptid
));
2957 /* No single-stepping LWP. Select one at random, out of those
2958 which have had SIGTRAP events. */
2960 /* First see how many SIGTRAP events we have. */
2961 iterate_over_lwps (filter
, count_events_callback
, &num_events
);
2963 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2964 random_selector
= (int)
2965 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2967 if (debug_linux_nat
&& num_events
> 1)
2968 fprintf_unfiltered (gdb_stdlog
,
2969 "SEL: Found %d SIGTRAP events, selecting #%d\n",
2970 num_events
, random_selector
);
2972 event_lp
= iterate_over_lwps (filter
,
2973 select_event_lwp_callback
,
2977 if (event_lp
!= NULL
)
2979 /* Switch the event LWP. */
2980 *orig_lp
= event_lp
;
2981 *status
= event_lp
->status
;
2984 /* Flush the wait status for the event LWP. */
2985 (*orig_lp
)->status
= 0;
2988 /* Return non-zero if LP has been resumed. */
2991 resumed_callback (struct lwp_info
*lp
, void *data
)
2996 /* Stop an active thread, verify it still exists, then resume it. */
2999 stop_and_resume_callback (struct lwp_info
*lp
, void *data
)
3001 struct lwp_info
*ptr
;
3003 if (!lp
->stopped
&& !lp
->signalled
)
3005 stop_callback (lp
, NULL
);
3006 stop_wait_callback (lp
, NULL
);
3007 /* Resume if the lwp still exists. */
3008 for (ptr
= lwp_list
; ptr
; ptr
= ptr
->next
)
3011 resume_callback (lp
, NULL
);
3012 resume_set_callback (lp
, NULL
);
3018 /* Check if we should go on and pass this event to common code.
3019 Return the affected lwp if we are, or NULL otherwise. */
3020 static struct lwp_info
*
3021 linux_nat_filter_event (int lwpid
, int status
, int options
)
3023 struct lwp_info
*lp
;
3025 lp
= find_lwp_pid (pid_to_ptid (lwpid
));
3027 /* Check for stop events reported by a process we didn't already
3028 know about - anything not already in our LWP list.
3030 If we're expecting to receive stopped processes after
3031 fork, vfork, and clone events, then we'll just add the
3032 new one to our list and go back to waiting for the event
3033 to be reported - the stopped process might be returned
3034 from waitpid before or after the event is. */
3035 if (WIFSTOPPED (status
) && !lp
)
3037 linux_record_stopped_pid (lwpid
, status
);
3041 /* Make sure we don't report an event for the exit of an LWP not in
3042 our list, i.e. not part of the current process. This can happen
3043 if we detach from a program we originally forked and then it
3045 if (!WIFSTOPPED (status
) && !lp
)
3048 /* NOTE drow/2003-06-17: This code seems to be meant for debugging
3049 CLONE_PTRACE processes which do not use the thread library -
3050 otherwise we wouldn't find the new LWP this way. That doesn't
3051 currently work, and the following code is currently unreachable
3052 due to the two blocks above. If it's fixed some day, this code
3053 should be broken out into a function so that we can also pick up
3054 LWPs from the new interface. */
3057 lp
= add_lwp (BUILD_LWP (lwpid
, GET_PID (inferior_ptid
)));
3058 if (options
& __WCLONE
)
3061 gdb_assert (WIFSTOPPED (status
)
3062 && WSTOPSIG (status
) == SIGSTOP
);
3065 if (!in_thread_list (inferior_ptid
))
3067 inferior_ptid
= BUILD_LWP (GET_PID (inferior_ptid
),
3068 GET_PID (inferior_ptid
));
3069 add_thread (inferior_ptid
);
3072 add_thread (lp
->ptid
);
3075 /* Handle GNU/Linux's syscall SIGTRAPs. */
3076 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
3078 /* No longer need the sysgood bit. The ptrace event ends up
3079 recorded in lp->waitstatus if we care for it. We can carry
3080 on handling the event like a regular SIGTRAP from here
3082 status
= W_STOPCODE (SIGTRAP
);
3083 if (linux_handle_syscall_trap (lp
, 0))
3087 /* Handle GNU/Linux's extended waitstatus for trace events. */
3088 if (WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
3090 if (debug_linux_nat
)
3091 fprintf_unfiltered (gdb_stdlog
,
3092 "LLW: Handling extended status 0x%06x\n",
3094 if (linux_handle_extended_wait (lp
, status
, 0))
3098 if (linux_nat_status_is_event (status
))
3100 /* Save the trap's siginfo in case we need it later. */
3106 /* Check if the thread has exited. */
3107 if ((WIFEXITED (status
) || WIFSIGNALED (status
))
3108 && num_lwps (GET_PID (lp
->ptid
)) > 1)
3110 /* If this is the main thread, we must stop all threads and verify
3111 if they are still alive. This is because in the nptl thread model
3112 on Linux 2.4, there is no signal issued for exiting LWPs
3113 other than the main thread. We only get the main thread exit
3114 signal once all child threads have already exited. If we
3115 stop all the threads and use the stop_wait_callback to check
3116 if they have exited we can determine whether this signal
3117 should be ignored or whether it means the end of the debugged
3118 application, regardless of which threading model is being
3120 if (GET_PID (lp
->ptid
) == GET_LWP (lp
->ptid
))
3123 iterate_over_lwps (pid_to_ptid (GET_PID (lp
->ptid
)),
3124 stop_and_resume_callback
, NULL
);
3127 if (debug_linux_nat
)
3128 fprintf_unfiltered (gdb_stdlog
,
3129 "LLW: %s exited.\n",
3130 target_pid_to_str (lp
->ptid
));
3132 if (num_lwps (GET_PID (lp
->ptid
)) > 1)
3134 /* If there is at least one more LWP, then the exit signal
3135 was not the end of the debugged application and should be
3142 /* Check if the current LWP has previously exited. In the nptl
3143 thread model, LWPs other than the main thread do not issue
3144 signals when they exit so we must check whenever the thread has
3145 stopped. A similar check is made in stop_wait_callback(). */
3146 if (num_lwps (GET_PID (lp
->ptid
)) > 1 && !linux_thread_alive (lp
->ptid
))
3148 ptid_t ptid
= pid_to_ptid (GET_PID (lp
->ptid
));
3150 if (debug_linux_nat
)
3151 fprintf_unfiltered (gdb_stdlog
,
3152 "LLW: %s exited.\n",
3153 target_pid_to_str (lp
->ptid
));
3157 /* Make sure there is at least one thread running. */
3158 gdb_assert (iterate_over_lwps (ptid
, running_callback
, NULL
));
3160 /* Discard the event. */
3164 /* Make sure we don't report a SIGSTOP that we sent ourselves in
3165 an attempt to stop an LWP. */
3167 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGSTOP
)
3169 if (debug_linux_nat
)
3170 fprintf_unfiltered (gdb_stdlog
,
3171 "LLW: Delayed SIGSTOP caught for %s.\n",
3172 target_pid_to_str (lp
->ptid
));
3174 /* This is a delayed SIGSTOP. */
3177 registers_changed ();
3179 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3180 lp
->step
, TARGET_SIGNAL_0
);
3181 if (debug_linux_nat
)
3182 fprintf_unfiltered (gdb_stdlog
,
3183 "LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
3185 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3186 target_pid_to_str (lp
->ptid
));
3189 gdb_assert (lp
->resumed
);
3191 /* Discard the event. */
3195 /* Make sure we don't report a SIGINT that we have already displayed
3196 for another thread. */
3197 if (lp
->ignore_sigint
3198 && WIFSTOPPED (status
) && WSTOPSIG (status
) == SIGINT
)
3200 if (debug_linux_nat
)
3201 fprintf_unfiltered (gdb_stdlog
,
3202 "LLW: Delayed SIGINT caught for %s.\n",
3203 target_pid_to_str (lp
->ptid
));
3205 /* This is a delayed SIGINT. */
3206 lp
->ignore_sigint
= 0;
3208 registers_changed ();
3209 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3210 lp
->step
, TARGET_SIGNAL_0
);
3211 if (debug_linux_nat
)
3212 fprintf_unfiltered (gdb_stdlog
,
3213 "LLW: %s %s, 0, 0 (discard SIGINT)\n",
3215 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3216 target_pid_to_str (lp
->ptid
));
3219 gdb_assert (lp
->resumed
);
3221 /* Discard the event. */
3225 /* An interesting event. */
3227 lp
->status
= status
;
3232 linux_nat_wait_1 (struct target_ops
*ops
,
3233 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3236 static sigset_t prev_mask
;
3237 struct lwp_info
*lp
= NULL
;
3242 if (debug_linux_nat_async
)
3243 fprintf_unfiltered (gdb_stdlog
, "LLW: enter\n");
3245 /* The first time we get here after starting a new inferior, we may
3246 not have added it to the LWP list yet - this is the earliest
3247 moment at which we know its PID. */
3248 if (ptid_is_pid (inferior_ptid
))
3250 /* Upgrade the main thread's ptid. */
3251 thread_change_ptid (inferior_ptid
,
3252 BUILD_LWP (GET_PID (inferior_ptid
),
3253 GET_PID (inferior_ptid
)));
3255 lp
= add_lwp (inferior_ptid
);
3259 /* Make sure SIGCHLD is blocked. */
3260 block_child_signals (&prev_mask
);
3262 if (ptid_equal (ptid
, minus_one_ptid
))
3264 else if (ptid_is_pid (ptid
))
3265 /* A request to wait for a specific tgid. This is not possible
3266 with waitpid, so instead, we wait for any child, and leave
3267 children we're not interested in right now with a pending
3268 status to report later. */
3271 pid
= GET_LWP (ptid
);
3277 /* Make sure that of those LWPs we want to get an event from, there
3278 is at least one LWP that has been resumed. If there's none, just
3279 bail out. The core may just be flushing asynchronously all
3281 if (iterate_over_lwps (ptid
, resumed_callback
, NULL
) == NULL
)
3283 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3285 if (debug_linux_nat_async
)
3286 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (no resumed LWP)\n");
3288 restore_child_signals_mask (&prev_mask
);
3289 return minus_one_ptid
;
3292 /* First check if there is a LWP with a wait status pending. */
3295 /* Any LWP that's been resumed will do. */
3296 lp
= iterate_over_lwps (ptid
, status_callback
, NULL
);
3299 if (debug_linux_nat
&& lp
->status
)
3300 fprintf_unfiltered (gdb_stdlog
,
3301 "LLW: Using pending wait status %s for %s.\n",
3302 status_to_str (lp
->status
),
3303 target_pid_to_str (lp
->ptid
));
3306 /* But if we don't find one, we'll have to wait, and check both
3307 cloned and uncloned processes. We start with the cloned
3309 options
= __WCLONE
| WNOHANG
;
3311 else if (is_lwp (ptid
))
3313 if (debug_linux_nat
)
3314 fprintf_unfiltered (gdb_stdlog
,
3315 "LLW: Waiting for specific LWP %s.\n",
3316 target_pid_to_str (ptid
));
3318 /* We have a specific LWP to check. */
3319 lp
= find_lwp_pid (ptid
);
3322 if (debug_linux_nat
&& lp
->status
)
3323 fprintf_unfiltered (gdb_stdlog
,
3324 "LLW: Using pending wait status %s for %s.\n",
3325 status_to_str (lp
->status
),
3326 target_pid_to_str (lp
->ptid
));
3328 /* If we have to wait, take into account whether PID is a cloned
3329 process or not. And we have to convert it to something that
3330 the layer beneath us can understand. */
3331 options
= lp
->cloned
? __WCLONE
: 0;
3332 pid
= GET_LWP (ptid
);
3334 /* We check for lp->waitstatus in addition to lp->status,
3335 because we can have pending process exits recorded in
3336 lp->status and W_EXITCODE(0,0) == 0. We should probably have
3337 an additional lp->status_p flag. */
3338 if (lp
->status
== 0 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3342 if (lp
&& lp
->signalled
)
3344 /* A pending SIGSTOP may interfere with the normal stream of
3345 events. In a typical case where interference is a problem,
3346 we have a SIGSTOP signal pending for LWP A while
3347 single-stepping it, encounter an event in LWP B, and take the
3348 pending SIGSTOP while trying to stop LWP A. After processing
3349 the event in LWP B, LWP A is continued, and we'll never see
3350 the SIGTRAP associated with the last time we were
3351 single-stepping LWP A. */
3353 /* Resume the thread. It should halt immediately returning the
3355 registers_changed ();
3356 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3357 lp
->step
, TARGET_SIGNAL_0
);
3358 if (debug_linux_nat
)
3359 fprintf_unfiltered (gdb_stdlog
,
3360 "LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
3361 lp
->step
? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3362 target_pid_to_str (lp
->ptid
));
3364 gdb_assert (lp
->resumed
);
3366 /* Catch the pending SIGSTOP. */
3367 status
= lp
->status
;
3370 stop_wait_callback (lp
, NULL
);
3372 /* If the lp->status field isn't empty, we caught another signal
3373 while flushing the SIGSTOP. Return it back to the event
3374 queue of the LWP, as we already have an event to handle. */
3377 if (debug_linux_nat
)
3378 fprintf_unfiltered (gdb_stdlog
,
3379 "LLW: kill %s, %s\n",
3380 target_pid_to_str (lp
->ptid
),
3381 status_to_str (lp
->status
));
3382 kill_lwp (GET_LWP (lp
->ptid
), WSTOPSIG (lp
->status
));
3385 lp
->status
= status
;
3388 if (!target_can_async_p ())
3390 /* Causes SIGINT to be passed on to the attached process. */
3394 /* Translate generic target_wait options into waitpid options. */
3395 if (target_options
& TARGET_WNOHANG
)
3402 lwpid
= my_waitpid (pid
, &status
, options
);
3406 gdb_assert (pid
== -1 || lwpid
== pid
);
3408 if (debug_linux_nat
)
3410 fprintf_unfiltered (gdb_stdlog
,
3411 "LLW: waitpid %ld received %s\n",
3412 (long) lwpid
, status_to_str (status
));
3415 lp
= linux_nat_filter_event (lwpid
, status
, options
);
3417 /* STATUS is now no longer valid, use LP->STATUS instead. */
3421 && ptid_is_pid (ptid
)
3422 && ptid_get_pid (lp
->ptid
) != ptid_get_pid (ptid
))
3424 gdb_assert (lp
->resumed
);
3426 if (debug_linux_nat
)
3428 "LWP %ld got an event %06x, leaving pending.\n",
3429 ptid_get_lwp (lp
->ptid
), lp
->status
);
3431 if (WIFSTOPPED (lp
->status
))
3433 if (WSTOPSIG (lp
->status
) != SIGSTOP
)
3435 /* Cancel breakpoint hits. The breakpoint may
3436 be removed before we fetch events from this
3437 process to report to the core. It is best
3438 not to assume the moribund breakpoints
3439 heuristic always handles these cases --- it
3440 could be too many events go through to the
3441 core before this one is handled. All-stop
3442 always cancels breakpoint hits in all
3445 && linux_nat_lp_status_is_event (lp
)
3446 && cancel_breakpoint (lp
))
3448 /* Throw away the SIGTRAP. */
3451 if (debug_linux_nat
)
3453 "LLW: LWP %ld hit a breakpoint while"
3454 " waiting for another process;"
3456 ptid_get_lwp (lp
->ptid
));
3466 else if (WIFEXITED (lp
->status
) || WIFSIGNALED (lp
->status
))
3468 if (debug_linux_nat
)
3470 "Process %ld exited while stopping LWPs\n",
3471 ptid_get_lwp (lp
->ptid
));
3473 /* This was the last lwp in the process. Since
3474 events are serialized to GDB core, and we can't
3475 report this one right now, but GDB core and the
3476 other target layers will want to be notified
3477 about the exit code/signal, leave the status
3478 pending for the next time we're able to report
3481 /* Prevent trying to stop this thread again. We'll
3482 never try to resume it because it has a pending
3486 /* Dead LWP's aren't expected to reported a pending
3490 /* Store the pending event in the waitstatus as
3491 well, because W_EXITCODE(0,0) == 0. */
3492 store_waitstatus (&lp
->waitstatus
, lp
->status
);
3506 /* waitpid did return something. Restart over. */
3507 options
|= __WCLONE
;
3515 /* Alternate between checking cloned and uncloned processes. */
3516 options
^= __WCLONE
;
3518 /* And every time we have checked both:
3519 In async mode, return to event loop;
3520 In sync mode, suspend waiting for a SIGCHLD signal. */
3521 if (options
& __WCLONE
)
3523 if (target_options
& TARGET_WNOHANG
)
3525 /* No interesting event. */
3526 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3528 if (debug_linux_nat_async
)
3529 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3531 restore_child_signals_mask (&prev_mask
);
3532 return minus_one_ptid
;
3535 sigsuspend (&suspend_mask
);
3538 else if (target_options
& TARGET_WNOHANG
)
3540 /* No interesting event for PID yet. */
3541 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
3543 if (debug_linux_nat_async
)
3544 fprintf_unfiltered (gdb_stdlog
, "LLW: exit (ignore)\n");
3546 restore_child_signals_mask (&prev_mask
);
3547 return minus_one_ptid
;
3550 /* We shouldn't end up here unless we want to try again. */
3551 gdb_assert (lp
== NULL
);
3554 if (!target_can_async_p ())
3555 clear_sigint_trap ();
3559 status
= lp
->status
;
3562 /* Don't report signals that GDB isn't interested in, such as
3563 signals that are neither printed nor stopped upon. Stopping all
3564 threads can be a bit time-consuming so if we want decent
3565 performance with heavily multi-threaded programs, especially when
3566 they're using a high frequency timer, we'd better avoid it if we
3569 if (WIFSTOPPED (status
))
3571 enum target_signal signo
= target_signal_from_host (WSTOPSIG (status
));
3573 /* When using hardware single-step, we need to report every signal.
3574 Otherwise, signals in pass_mask may be short-circuited. */
3576 && WSTOPSIG (status
) && sigismember (&pass_mask
, WSTOPSIG (status
)))
3578 /* FIMXE: kettenis/2001-06-06: Should we resume all threads
3579 here? It is not clear we should. GDB may not expect
3580 other threads to run. On the other hand, not resuming
3581 newly attached threads may cause an unwanted delay in
3582 getting them running. */
3583 registers_changed ();
3584 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3586 if (debug_linux_nat
)
3587 fprintf_unfiltered (gdb_stdlog
,
3588 "LLW: %s %s, %s (preempt 'handle')\n",
3590 "PTRACE_SINGLESTEP" : "PTRACE_CONT",
3591 target_pid_to_str (lp
->ptid
),
3592 (signo
!= TARGET_SIGNAL_0
3593 ? strsignal (target_signal_to_host (signo
))
3601 /* Only do the below in all-stop, as we currently use SIGINT
3602 to implement target_stop (see linux_nat_stop) in
3604 if (signo
== TARGET_SIGNAL_INT
&& signal_pass_state (signo
) == 0)
3606 /* If ^C/BREAK is typed at the tty/console, SIGINT gets
3607 forwarded to the entire process group, that is, all LWPs
3608 will receive it - unless they're using CLONE_THREAD to
3609 share signals. Since we only want to report it once, we
3610 mark it as ignored for all LWPs except this one. */
3611 iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid
)),
3612 set_ignore_sigint
, NULL
);
3613 lp
->ignore_sigint
= 0;
3616 maybe_clear_ignore_sigint (lp
);
3620 /* This LWP is stopped now. */
3623 if (debug_linux_nat
)
3624 fprintf_unfiltered (gdb_stdlog
, "LLW: Candidate event %s in %s.\n",
3625 status_to_str (status
), target_pid_to_str (lp
->ptid
));
3629 /* Now stop all other LWP's ... */
3630 iterate_over_lwps (minus_one_ptid
, stop_callback
, NULL
);
3632 /* ... and wait until all of them have reported back that
3633 they're no longer running. */
3634 iterate_over_lwps (minus_one_ptid
, stop_wait_callback
, NULL
);
3636 /* If we're not waiting for a specific LWP, choose an event LWP
3637 from among those that have had events. Giving equal priority
3638 to all LWPs that have had events helps prevent
3641 select_event_lwp (ptid
, &lp
, &status
);
3643 /* Now that we've selected our final event LWP, cancel any
3644 breakpoints in other LWPs that have hit a GDB breakpoint.
3645 See the comment in cancel_breakpoints_callback to find out
3647 iterate_over_lwps (minus_one_ptid
, cancel_breakpoints_callback
, lp
);
3649 /* In all-stop, from the core's perspective, all LWPs are now
3650 stopped until a new resume action is sent over. */
3651 iterate_over_lwps (minus_one_ptid
, resume_clear_callback
, NULL
);
3656 if (linux_nat_status_is_event (status
))
3658 if (debug_linux_nat
)
3659 fprintf_unfiltered (gdb_stdlog
,
3660 "LLW: trap ptid is %s.\n",
3661 target_pid_to_str (lp
->ptid
));
3664 if (lp
->waitstatus
.kind
!= TARGET_WAITKIND_IGNORE
)
3666 *ourstatus
= lp
->waitstatus
;
3667 lp
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3670 store_waitstatus (ourstatus
, status
);
3672 if (debug_linux_nat_async
)
3673 fprintf_unfiltered (gdb_stdlog
, "LLW: exit\n");
3675 restore_child_signals_mask (&prev_mask
);
3677 if (ourstatus
->kind
== TARGET_WAITKIND_EXITED
3678 || ourstatus
->kind
== TARGET_WAITKIND_SIGNALLED
)
3681 lp
->core
= linux_nat_core_of_thread_1 (lp
->ptid
);
3686 /* Resume LWPs that are currently stopped without any pending status
3687 to report, but are resumed from the core's perspective. */
3690 resume_stopped_resumed_lwps (struct lwp_info
*lp
, void *data
)
3692 ptid_t
*wait_ptid_p
= data
;
3697 && lp
->waitstatus
.kind
== TARGET_WAITKIND_IGNORE
)
3699 gdb_assert (is_executing (lp
->ptid
));
3701 /* Don't bother if there's a breakpoint at PC that we'd hit
3702 immediately, and we're not waiting for this LWP. */
3703 if (!ptid_match (lp
->ptid
, *wait_ptid_p
))
3705 struct regcache
*regcache
= get_thread_regcache (lp
->ptid
);
3706 CORE_ADDR pc
= regcache_read_pc (regcache
);
3708 if (breakpoint_inserted_here_p (get_regcache_aspace (regcache
), pc
))
3712 if (debug_linux_nat
)
3713 fprintf_unfiltered (gdb_stdlog
,
3714 "RSRL: resuming stopped-resumed LWP %s\n",
3715 target_pid_to_str (lp
->ptid
));
3717 linux_ops
->to_resume (linux_ops
, pid_to_ptid (GET_LWP (lp
->ptid
)),
3718 lp
->step
, TARGET_SIGNAL_0
);
3720 memset (&lp
->siginfo
, 0, sizeof (lp
->siginfo
));
3721 lp
->stopped_by_watchpoint
= 0;
3728 linux_nat_wait (struct target_ops
*ops
,
3729 ptid_t ptid
, struct target_waitstatus
*ourstatus
,
3734 if (debug_linux_nat
)
3735 fprintf_unfiltered (gdb_stdlog
,
3736 "linux_nat_wait: [%s]\n", target_pid_to_str (ptid
));
3738 /* Flush the async file first. */
3739 if (target_can_async_p ())
3740 async_file_flush ();
3742 /* Resume LWPs that are currently stopped without any pending status
3743 to report, but are resumed from the core's perspective. LWPs get
3744 in this state if we find them stopping at a time we're not
3745 interested in reporting the event (target_wait on a
3746 specific_process, for example, see linux_nat_wait_1), and
3747 meanwhile the event became uninteresting. Don't bother resuming
3748 LWPs we're not going to wait for if they'd stop immediately. */
3750 iterate_over_lwps (minus_one_ptid
, resume_stopped_resumed_lwps
, &ptid
);
3752 event_ptid
= linux_nat_wait_1 (ops
, ptid
, ourstatus
, target_options
);
3754 /* If we requested any event, and something came out, assume there
3755 may be more. If we requested a specific lwp or process, also
3756 assume there may be more. */
3757 if (target_can_async_p ()
3758 && (ourstatus
->kind
!= TARGET_WAITKIND_IGNORE
3759 || !ptid_equal (ptid
, minus_one_ptid
)))
3762 /* Get ready for the next event. */
3763 if (target_can_async_p ())
3764 target_async (inferior_event_handler
, 0);
3770 kill_callback (struct lwp_info
*lp
, void *data
)
3773 ptrace (PTRACE_KILL
, GET_LWP (lp
->ptid
), 0, 0);
3774 if (debug_linux_nat
)
3775 fprintf_unfiltered (gdb_stdlog
,
3776 "KC: PTRACE_KILL %s, 0, 0 (%s)\n",
3777 target_pid_to_str (lp
->ptid
),
3778 errno
? safe_strerror (errno
) : "OK");
3784 kill_wait_callback (struct lwp_info
*lp
, void *data
)
3788 /* We must make sure that there are no pending events (delayed
3789 SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
3790 program doesn't interfere with any following debugging session. */
3792 /* For cloned processes we must check both with __WCLONE and
3793 without, since the exit status of a cloned process isn't reported
3799 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, __WCLONE
);
3800 if (pid
!= (pid_t
) -1)
3802 if (debug_linux_nat
)
3803 fprintf_unfiltered (gdb_stdlog
,
3804 "KWC: wait %s received unknown.\n",
3805 target_pid_to_str (lp
->ptid
));
3806 /* The Linux kernel sometimes fails to kill a thread
3807 completely after PTRACE_KILL; that goes from the stop
3808 point in do_fork out to the one in
3809 get_signal_to_deliever and waits again. So kill it
3811 kill_callback (lp
, NULL
);
3814 while (pid
== GET_LWP (lp
->ptid
));
3816 gdb_assert (pid
== -1 && errno
== ECHILD
);
3821 pid
= my_waitpid (GET_LWP (lp
->ptid
), NULL
, 0);
3822 if (pid
!= (pid_t
) -1)
3824 if (debug_linux_nat
)
3825 fprintf_unfiltered (gdb_stdlog
,
3826 "KWC: wait %s received unk.\n",
3827 target_pid_to_str (lp
->ptid
));
3828 /* See the call to kill_callback above. */
3829 kill_callback (lp
, NULL
);
3832 while (pid
== GET_LWP (lp
->ptid
));
3834 gdb_assert (pid
== -1 && errno
== ECHILD
);
3839 linux_nat_kill (struct target_ops
*ops
)
3841 struct target_waitstatus last
;
3845 /* If we're stopped while forking and we haven't followed yet,
3846 kill the other task. We need to do this first because the
3847 parent will be sleeping if this is a vfork. */
3849 get_last_target_status (&last_ptid
, &last
);
3851 if (last
.kind
== TARGET_WAITKIND_FORKED
3852 || last
.kind
== TARGET_WAITKIND_VFORKED
)
3854 ptrace (PT_KILL
, PIDGET (last
.value
.related_pid
), 0, 0);
3858 if (forks_exist_p ())
3859 linux_fork_killall ();
3862 ptid_t ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
3864 /* Stop all threads before killing them, since ptrace requires
3865 that the thread is stopped to sucessfully PTRACE_KILL. */
3866 iterate_over_lwps (ptid
, stop_callback
, NULL
);
3867 /* ... and wait until all of them have reported back that
3868 they're no longer running. */
3869 iterate_over_lwps (ptid
, stop_wait_callback
, NULL
);
3871 /* Kill all LWP's ... */
3872 iterate_over_lwps (ptid
, kill_callback
, NULL
);
3874 /* ... and wait until we've flushed all events. */
3875 iterate_over_lwps (ptid
, kill_wait_callback
, NULL
);
3878 target_mourn_inferior ();
3882 linux_nat_mourn_inferior (struct target_ops
*ops
)
3884 purge_lwp_list (ptid_get_pid (inferior_ptid
));
3886 if (! forks_exist_p ())
3887 /* Normal case, no other forks available. */
3888 linux_ops
->to_mourn_inferior (ops
);
3890 /* Multi-fork case. The current inferior_ptid has exited, but
3891 there are other viable forks to debug. Delete the exiting
3892 one and context-switch to the first available. */
3893 linux_fork_mourn_inferior ();
3896 /* Convert a native/host siginfo object, into/from the siginfo in the
3897 layout of the inferiors' architecture. */
3900 siginfo_fixup (struct siginfo
*siginfo
, gdb_byte
*inf_siginfo
, int direction
)
3904 if (linux_nat_siginfo_fixup
!= NULL
)
3905 done
= linux_nat_siginfo_fixup (siginfo
, inf_siginfo
, direction
);
3907 /* If there was no callback, or the callback didn't do anything,
3908 then just do a straight memcpy. */
3912 memcpy (siginfo
, inf_siginfo
, sizeof (struct siginfo
));
3914 memcpy (inf_siginfo
, siginfo
, sizeof (struct siginfo
));
3919 linux_xfer_siginfo (struct target_ops
*ops
, enum target_object object
,
3920 const char *annex
, gdb_byte
*readbuf
,
3921 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
3924 struct siginfo siginfo
;
3925 gdb_byte inf_siginfo
[sizeof (struct siginfo
)];
3927 gdb_assert (object
== TARGET_OBJECT_SIGNAL_INFO
);
3928 gdb_assert (readbuf
|| writebuf
);
3930 pid
= GET_LWP (inferior_ptid
);
3932 pid
= GET_PID (inferior_ptid
);
3934 if (offset
> sizeof (siginfo
))
3938 ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
3942 /* When GDB is built as a 64-bit application, ptrace writes into
3943 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
3944 inferior with a 64-bit GDB should look the same as debugging it
3945 with a 32-bit GDB, we need to convert it. GDB core always sees
3946 the converted layout, so any read/write will have to be done
3948 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
3950 if (offset
+ len
> sizeof (siginfo
))
3951 len
= sizeof (siginfo
) - offset
;
3953 if (readbuf
!= NULL
)
3954 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
3957 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
3959 /* Convert back to ptrace layout before flushing it out. */
3960 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
3963 ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
);
3972 linux_nat_xfer_partial (struct target_ops
*ops
, enum target_object object
,
3973 const char *annex
, gdb_byte
*readbuf
,
3974 const gdb_byte
*writebuf
,
3975 ULONGEST offset
, LONGEST len
)
3977 struct cleanup
*old_chain
;
3980 if (object
== TARGET_OBJECT_SIGNAL_INFO
)
3981 return linux_xfer_siginfo (ops
, object
, annex
, readbuf
, writebuf
,
3984 /* The target is connected but no live inferior is selected. Pass
3985 this request down to a lower stratum (e.g., the executable
3987 if (object
== TARGET_OBJECT_MEMORY
&& ptid_equal (inferior_ptid
, null_ptid
))
3990 old_chain
= save_inferior_ptid ();
3992 if (is_lwp (inferior_ptid
))
3993 inferior_ptid
= pid_to_ptid (GET_LWP (inferior_ptid
));
3995 xfer
= linux_ops
->to_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
3998 do_cleanups (old_chain
);
4003 linux_thread_alive (ptid_t ptid
)
4007 gdb_assert (is_lwp (ptid
));
4009 /* Send signal 0 instead of anything ptrace, because ptracing a
4010 running thread errors out claiming that the thread doesn't
4012 err
= kill_lwp (GET_LWP (ptid
), 0);
4014 if (debug_linux_nat
)
4015 fprintf_unfiltered (gdb_stdlog
,
4016 "LLTA: KILL(SIG0) %s (%s)\n",
4017 target_pid_to_str (ptid
),
4018 err
? safe_strerror (tmp_errno
) : "OK");
4027 linux_nat_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
4029 return linux_thread_alive (ptid
);
4033 linux_nat_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
4035 static char buf
[64];
4038 && (GET_PID (ptid
) != GET_LWP (ptid
)
4039 || num_lwps (GET_PID (ptid
)) > 1))
4041 snprintf (buf
, sizeof (buf
), "LWP %ld", GET_LWP (ptid
));
4045 return normal_pid_to_str (ptid
);
4049 linux_nat_thread_name (struct thread_info
*thr
)
4051 int pid
= ptid_get_pid (thr
->ptid
);
4052 long lwp
= ptid_get_lwp (thr
->ptid
);
4053 #define FORMAT "/proc/%d/task/%ld/comm"
4054 char buf
[sizeof (FORMAT
) + 30];
4056 char *result
= NULL
;
4058 snprintf (buf
, sizeof (buf
), FORMAT
, pid
, lwp
);
4059 comm_file
= fopen (buf
, "r");
4062 /* Not exported by the kernel, so we define it here. */
4064 static char line
[COMM_LEN
+ 1];
4066 if (fgets (line
, sizeof (line
), comm_file
))
4068 char *nl
= strchr (line
, '\n');
4085 /* Accepts an integer PID; Returns a string representing a file that
4086 can be opened to get the symbols for the child process. */
4089 linux_child_pid_to_exec_file (int pid
)
4091 char *name1
, *name2
;
4093 name1
= xmalloc (MAXPATHLEN
);
4094 name2
= xmalloc (MAXPATHLEN
);
4095 make_cleanup (xfree
, name1
);
4096 make_cleanup (xfree
, name2
);
4097 memset (name2
, 0, MAXPATHLEN
);
4099 sprintf (name1
, "/proc/%d/exe", pid
);
4100 if (readlink (name1
, name2
, MAXPATHLEN
) > 0)
4106 /* Service function for corefiles and info proc. */
4109 read_mapping (FILE *mapfile
,
4114 char *device
, long long *inode
, char *filename
)
4116 int ret
= fscanf (mapfile
, "%llx-%llx %s %llx %s %llx",
4117 addr
, endaddr
, permissions
, offset
, device
, inode
);
4120 if (ret
> 0 && ret
!= EOF
)
4122 /* Eat everything up to EOL for the filename. This will prevent
4123 weird filenames (such as one with embedded whitespace) from
4124 confusing this code. It also makes this code more robust in
4125 respect to annotations the kernel may add after the filename.
4127 Note the filename is used for informational purposes
4129 ret
+= fscanf (mapfile
, "%[^\n]\n", filename
);
4132 return (ret
!= 0 && ret
!= EOF
);
4135 /* Fills the "to_find_memory_regions" target vector. Lists the memory
4136 regions in the inferior for a corefile. */
4139 linux_nat_find_memory_regions (find_memory_region_ftype func
, void *obfd
)
4141 int pid
= PIDGET (inferior_ptid
);
4142 char mapsfilename
[MAXPATHLEN
];
4144 long long addr
, endaddr
, size
, offset
, inode
;
4145 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4146 int read
, write
, exec
;
4147 struct cleanup
*cleanup
;
4149 /* Compose the filename for the /proc memory map, and open it. */
4150 sprintf (mapsfilename
, "/proc/%d/maps", pid
);
4151 if ((mapsfile
= fopen (mapsfilename
, "r")) == NULL
)
4152 error (_("Could not open %s."), mapsfilename
);
4153 cleanup
= make_cleanup_fclose (mapsfile
);
4156 fprintf_filtered (gdb_stdout
,
4157 "Reading memory regions from %s\n", mapsfilename
);
4159 /* Now iterate until end-of-file. */
4160 while (read_mapping (mapsfile
, &addr
, &endaddr
, &permissions
[0],
4161 &offset
, &device
[0], &inode
, &filename
[0]))
4163 size
= endaddr
- addr
;
4165 /* Get the segment's permissions. */
4166 read
= (strchr (permissions
, 'r') != 0);
4167 write
= (strchr (permissions
, 'w') != 0);
4168 exec
= (strchr (permissions
, 'x') != 0);
4172 fprintf_filtered (gdb_stdout
,
4173 "Save segment, %s bytes at %s (%c%c%c)",
4174 plongest (size
), paddress (target_gdbarch
, addr
),
4176 write
? 'w' : ' ', exec
? 'x' : ' ');
4178 fprintf_filtered (gdb_stdout
, " for %s", filename
);
4179 fprintf_filtered (gdb_stdout
, "\n");
4182 /* Invoke the callback function to create the corefile
4184 func (addr
, size
, read
, write
, exec
, obfd
);
4186 do_cleanups (cleanup
);
4191 find_signalled_thread (struct thread_info
*info
, void *data
)
4193 if (info
->suspend
.stop_signal
!= TARGET_SIGNAL_0
4194 && ptid_get_pid (info
->ptid
) == ptid_get_pid (inferior_ptid
))
4200 static enum target_signal
4201 find_stop_signal (void)
4203 struct thread_info
*info
=
4204 iterate_over_threads (find_signalled_thread
, NULL
);
4207 return info
->suspend
.stop_signal
;
4209 return TARGET_SIGNAL_0
;
4212 /* Records the thread's register state for the corefile note
4216 linux_nat_do_thread_registers (bfd
*obfd
, ptid_t ptid
,
4217 char *note_data
, int *note_size
,
4218 enum target_signal stop_signal
)
4220 unsigned long lwp
= ptid_get_lwp (ptid
);
4221 struct gdbarch
*gdbarch
= target_gdbarch
;
4222 struct regcache
*regcache
= get_thread_arch_regcache (ptid
, gdbarch
);
4223 const struct regset
*regset
;
4225 struct cleanup
*old_chain
;
4226 struct core_regset_section
*sect_list
;
4229 old_chain
= save_inferior_ptid ();
4230 inferior_ptid
= ptid
;
4231 target_fetch_registers (regcache
, -1);
4232 do_cleanups (old_chain
);
4234 core_regset_p
= gdbarch_regset_from_core_section_p (gdbarch
);
4235 sect_list
= gdbarch_core_regset_sections (gdbarch
);
4237 /* The loop below uses the new struct core_regset_section, which stores
4238 the supported section names and sizes for the core file. Note that
4239 note PRSTATUS needs to be treated specially. But the other notes are
4240 structurally the same, so they can benefit from the new struct. */
4241 if (core_regset_p
&& sect_list
!= NULL
)
4242 while (sect_list
->sect_name
!= NULL
)
4244 regset
= gdbarch_regset_from_core_section (gdbarch
,
4245 sect_list
->sect_name
,
4247 gdb_assert (regset
&& regset
->collect_regset
);
4248 gdb_regset
= xmalloc (sect_list
->size
);
4249 regset
->collect_regset (regset
, regcache
, -1,
4250 gdb_regset
, sect_list
->size
);
4252 if (strcmp (sect_list
->sect_name
, ".reg") == 0)
4253 note_data
= (char *) elfcore_write_prstatus
4254 (obfd
, note_data
, note_size
,
4255 lwp
, target_signal_to_host (stop_signal
),
4258 note_data
= (char *) elfcore_write_register_note
4259 (obfd
, note_data
, note_size
,
4260 sect_list
->sect_name
, gdb_regset
,
4266 /* For architectures that does not have the struct core_regset_section
4267 implemented, we use the old method. When all the architectures have
4268 the new support, the code below should be deleted. */
4271 gdb_gregset_t gregs
;
4272 gdb_fpregset_t fpregs
;
4275 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg",
4277 != NULL
&& regset
->collect_regset
!= NULL
)
4278 regset
->collect_regset (regset
, regcache
, -1,
4279 &gregs
, sizeof (gregs
));
4281 fill_gregset (regcache
, &gregs
, -1);
4283 note_data
= (char *) elfcore_write_prstatus
4284 (obfd
, note_data
, note_size
, lwp
, target_signal_to_host (stop_signal
),
4288 && (regset
= gdbarch_regset_from_core_section (gdbarch
, ".reg2",
4290 != NULL
&& regset
->collect_regset
!= NULL
)
4291 regset
->collect_regset (regset
, regcache
, -1,
4292 &fpregs
, sizeof (fpregs
));
4294 fill_fpregset (regcache
, &fpregs
, -1);
4296 note_data
= (char *) elfcore_write_prfpreg (obfd
,
4299 &fpregs
, sizeof (fpregs
));
4305 struct linux_nat_corefile_thread_data
4311 enum target_signal stop_signal
;
4314 /* Called by gdbthread.c once per thread. Records the thread's
4315 register state for the corefile note section. */
4318 linux_nat_corefile_thread_callback (struct lwp_info
*ti
, void *data
)
4320 struct linux_nat_corefile_thread_data
*args
= data
;
4322 args
->note_data
= linux_nat_do_thread_registers (args
->obfd
,
4332 /* Enumerate spufs IDs for process PID. */
4335 iterate_over_spus (int pid
, void (*callback
) (void *, int), void *data
)
4339 struct dirent
*entry
;
4341 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4342 dir
= opendir (path
);
4347 while ((entry
= readdir (dir
)) != NULL
)
4353 fd
= atoi (entry
->d_name
);
4357 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4358 if (stat (path
, &st
) != 0)
4360 if (!S_ISDIR (st
.st_mode
))
4363 if (statfs (path
, &stfs
) != 0)
4365 if (stfs
.f_type
!= SPUFS_MAGIC
)
4368 callback (data
, fd
);
4374 /* Generate corefile notes for SPU contexts. */
4376 struct linux_spu_corefile_data
4384 linux_spu_corefile_callback (void *data
, int fd
)
4386 struct linux_spu_corefile_data
*args
= data
;
4389 static const char *spu_files
[] =
4411 for (i
= 0; i
< sizeof (spu_files
) / sizeof (spu_files
[0]); i
++)
4413 char annex
[32], note_name
[32];
4417 xsnprintf (annex
, sizeof annex
, "%d/%s", fd
, spu_files
[i
]);
4418 spu_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_SPU
,
4422 xsnprintf (note_name
, sizeof note_name
, "SPU/%s", annex
);
4423 args
->note_data
= elfcore_write_note (args
->obfd
, args
->note_data
,
4424 args
->note_size
, note_name
,
4425 NT_SPU
, spu_data
, spu_len
);
4432 linux_spu_make_corefile_notes (bfd
*obfd
, char *note_data
, int *note_size
)
4434 struct linux_spu_corefile_data args
;
4437 args
.note_data
= note_data
;
4438 args
.note_size
= note_size
;
4440 iterate_over_spus (PIDGET (inferior_ptid
),
4441 linux_spu_corefile_callback
, &args
);
4443 return args
.note_data
;
4446 /* Fills the "to_make_corefile_note" target vector. Builds the note
4447 section for a corefile, and returns it in a malloc buffer. */
4450 linux_nat_make_corefile_notes (bfd
*obfd
, int *note_size
)
4452 struct linux_nat_corefile_thread_data thread_args
;
4453 /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */
4454 char fname
[16] = { '\0' };
4455 /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */
4456 char psargs
[80] = { '\0' };
4457 char *note_data
= NULL
;
4458 ptid_t filter
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
4462 if (get_exec_file (0))
4464 strncpy (fname
, lbasename (get_exec_file (0)), sizeof (fname
));
4465 strncpy (psargs
, get_exec_file (0), sizeof (psargs
));
4466 if (get_inferior_args ())
4469 char *psargs_end
= psargs
+ sizeof (psargs
);
4471 /* linux_elfcore_write_prpsinfo () handles zero unterminated
4473 string_end
= memchr (psargs
, 0, sizeof (psargs
));
4474 if (string_end
!= NULL
)
4476 *string_end
++ = ' ';
4477 strncpy (string_end
, get_inferior_args (),
4478 psargs_end
- string_end
);
4481 note_data
= (char *) elfcore_write_prpsinfo (obfd
,
4483 note_size
, fname
, psargs
);
4486 /* Dump information for threads. */
4487 thread_args
.obfd
= obfd
;
4488 thread_args
.note_data
= note_data
;
4489 thread_args
.note_size
= note_size
;
4490 thread_args
.num_notes
= 0;
4491 thread_args
.stop_signal
= find_stop_signal ();
4492 iterate_over_lwps (filter
, linux_nat_corefile_thread_callback
, &thread_args
);
4493 gdb_assert (thread_args
.num_notes
!= 0);
4494 note_data
= thread_args
.note_data
;
4496 auxv_len
= target_read_alloc (¤t_target
, TARGET_OBJECT_AUXV
,
4500 note_data
= elfcore_write_note (obfd
, note_data
, note_size
,
4501 "CORE", NT_AUXV
, auxv
, auxv_len
);
4505 note_data
= linux_spu_make_corefile_notes (obfd
, note_data
, note_size
);
4507 make_cleanup (xfree
, note_data
);
4511 /* Implement the "info proc" command. */
4514 linux_nat_info_proc_cmd (char *args
, int from_tty
)
4516 /* A long is used for pid instead of an int to avoid a loss of precision
4517 compiler warning from the output of strtoul. */
4518 long pid
= PIDGET (inferior_ptid
);
4521 char buffer
[MAXPATHLEN
];
4522 char fname1
[MAXPATHLEN
], fname2
[MAXPATHLEN
];
4534 /* Break up 'args' into an argv array. */
4535 argv
= gdb_buildargv (args
);
4536 make_cleanup_freeargv (argv
);
4538 while (argv
!= NULL
&& *argv
!= NULL
)
4540 if (isdigit (argv
[0][0]))
4542 pid
= strtoul (argv
[0], NULL
, 10);
4544 else if (strncmp (argv
[0], "mappings", strlen (argv
[0])) == 0)
4548 else if (strcmp (argv
[0], "status") == 0)
4552 else if (strcmp (argv
[0], "stat") == 0)
4556 else if (strcmp (argv
[0], "cmd") == 0)
4560 else if (strncmp (argv
[0], "exe", strlen (argv
[0])) == 0)
4564 else if (strcmp (argv
[0], "cwd") == 0)
4568 else if (strncmp (argv
[0], "all", strlen (argv
[0])) == 0)
4574 /* [...] (future options here). */
4579 error (_("No current process: you must name one."));
4581 sprintf (fname1
, "/proc/%ld", pid
);
4582 if (stat (fname1
, &dummy
) != 0)
4583 error (_("No /proc directory: '%s'"), fname1
);
4585 printf_filtered (_("process %ld\n"), pid
);
4586 if (cmdline_f
|| all
)
4588 sprintf (fname1
, "/proc/%ld/cmdline", pid
);
4589 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4591 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4593 if (fgets (buffer
, sizeof (buffer
), procfile
))
4594 printf_filtered ("cmdline = '%s'\n", buffer
);
4596 warning (_("unable to read '%s'"), fname1
);
4597 do_cleanups (cleanup
);
4600 warning (_("unable to open /proc file '%s'"), fname1
);
4604 sprintf (fname1
, "/proc/%ld/cwd", pid
);
4605 memset (fname2
, 0, sizeof (fname2
));
4606 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4607 printf_filtered ("cwd = '%s'\n", fname2
);
4609 warning (_("unable to read link '%s'"), fname1
);
4613 sprintf (fname1
, "/proc/%ld/exe", pid
);
4614 memset (fname2
, 0, sizeof (fname2
));
4615 if (readlink (fname1
, fname2
, sizeof (fname2
)) > 0)
4616 printf_filtered ("exe = '%s'\n", fname2
);
4618 warning (_("unable to read link '%s'"), fname1
);
4620 if (mappings_f
|| all
)
4622 sprintf (fname1
, "/proc/%ld/maps", pid
);
4623 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4625 long long addr
, endaddr
, size
, offset
, inode
;
4626 char permissions
[8], device
[8], filename
[MAXPATHLEN
];
4627 struct cleanup
*cleanup
;
4629 cleanup
= make_cleanup_fclose (procfile
);
4630 printf_filtered (_("Mapped address spaces:\n\n"));
4631 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4633 printf_filtered ("\t%10s %10s %10s %10s %7s\n",
4636 " Size", " Offset", "objfile");
4640 printf_filtered (" %18s %18s %10s %10s %7s\n",
4643 " Size", " Offset", "objfile");
4646 while (read_mapping (procfile
, &addr
, &endaddr
, &permissions
[0],
4647 &offset
, &device
[0], &inode
, &filename
[0]))
4649 size
= endaddr
- addr
;
4651 /* FIXME: carlton/2003-08-27: Maybe the printf_filtered
4652 calls here (and possibly above) should be abstracted
4653 out into their own functions? Andrew suggests using
4654 a generic local_address_string instead to print out
4655 the addresses; that makes sense to me, too. */
4657 if (gdbarch_addr_bit (target_gdbarch
) == 32)
4659 printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
4660 (unsigned long) addr
, /* FIXME: pr_addr */
4661 (unsigned long) endaddr
,
4663 (unsigned int) offset
,
4664 filename
[0] ? filename
: "");
4668 printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
4669 (unsigned long) addr
, /* FIXME: pr_addr */
4670 (unsigned long) endaddr
,
4672 (unsigned int) offset
,
4673 filename
[0] ? filename
: "");
4677 do_cleanups (cleanup
);
4680 warning (_("unable to open /proc file '%s'"), fname1
);
4682 if (status_f
|| all
)
4684 sprintf (fname1
, "/proc/%ld/status", pid
);
4685 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4687 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4689 while (fgets (buffer
, sizeof (buffer
), procfile
) != NULL
)
4690 puts_filtered (buffer
);
4691 do_cleanups (cleanup
);
4694 warning (_("unable to open /proc file '%s'"), fname1
);
4698 sprintf (fname1
, "/proc/%ld/stat", pid
);
4699 if ((procfile
= fopen (fname1
, "r")) != NULL
)
4704 struct cleanup
*cleanup
= make_cleanup_fclose (procfile
);
4706 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4707 printf_filtered (_("Process: %d\n"), itmp
);
4708 if (fscanf (procfile
, "(%[^)]) ", &buffer
[0]) > 0)
4709 printf_filtered (_("Exec file: %s\n"), buffer
);
4710 if (fscanf (procfile
, "%c ", &ctmp
) > 0)
4711 printf_filtered (_("State: %c\n"), ctmp
);
4712 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4713 printf_filtered (_("Parent process: %d\n"), itmp
);
4714 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4715 printf_filtered (_("Process group: %d\n"), itmp
);
4716 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4717 printf_filtered (_("Session id: %d\n"), itmp
);
4718 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4719 printf_filtered (_("TTY: %d\n"), itmp
);
4720 if (fscanf (procfile
, "%d ", &itmp
) > 0)
4721 printf_filtered (_("TTY owner process group: %d\n"), itmp
);
4722 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4723 printf_filtered (_("Flags: 0x%lx\n"), ltmp
);
4724 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4725 printf_filtered (_("Minor faults (no memory page): %lu\n"),
4726 (unsigned long) ltmp
);
4727 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4728 printf_filtered (_("Minor faults, children: %lu\n"),
4729 (unsigned long) ltmp
);
4730 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4731 printf_filtered (_("Major faults (memory page faults): %lu\n"),
4732 (unsigned long) ltmp
);
4733 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4734 printf_filtered (_("Major faults, children: %lu\n"),
4735 (unsigned long) ltmp
);
4736 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4737 printf_filtered (_("utime: %ld\n"), ltmp
);
4738 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4739 printf_filtered (_("stime: %ld\n"), ltmp
);
4740 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4741 printf_filtered (_("utime, children: %ld\n"), ltmp
);
4742 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4743 printf_filtered (_("stime, children: %ld\n"), ltmp
);
4744 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4745 printf_filtered (_("jiffies remaining in current "
4746 "time slice: %ld\n"), ltmp
);
4747 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4748 printf_filtered (_("'nice' value: %ld\n"), ltmp
);
4749 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4750 printf_filtered (_("jiffies until next timeout: %lu\n"),
4751 (unsigned long) ltmp
);
4752 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4753 printf_filtered (_("jiffies until next SIGALRM: %lu\n"),
4754 (unsigned long) ltmp
);
4755 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4756 printf_filtered (_("start time (jiffies since "
4757 "system boot): %ld\n"), ltmp
);
4758 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4759 printf_filtered (_("Virtual memory size: %lu\n"),
4760 (unsigned long) ltmp
);
4761 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4762 printf_filtered (_("Resident set size: %lu\n"),
4763 (unsigned long) ltmp
);
4764 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4765 printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp
);
4766 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4767 printf_filtered (_("Start of text: 0x%lx\n"), ltmp
);
4768 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4769 printf_filtered (_("End of text: 0x%lx\n"), ltmp
);
4770 if (fscanf (procfile
, "%lu ", <mp
) > 0)
4771 printf_filtered (_("Start of stack: 0x%lx\n"), ltmp
);
4772 #if 0 /* Don't know how architecture-dependent the rest is...
4773 Anyway the signal bitmap info is available from "status". */
4774 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4775 printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp
);
4776 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4777 printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp
);
4778 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4779 printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp
);
4780 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4781 printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp
);
4782 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4783 printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp
);
4784 if (fscanf (procfile
, "%ld ", <mp
) > 0)
4785 printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp
);
4786 if (fscanf (procfile
, "%lu ", <mp
) > 0) /* FIXME arch? */
4787 printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp
);
4789 do_cleanups (cleanup
);
4792 warning (_("unable to open /proc file '%s'"), fname1
);
4796 /* Implement the to_xfer_partial interface for memory reads using the /proc
4797 filesystem. Because we can use a single read() call for /proc, this
4798 can be much more efficient than banging away at PTRACE_PEEKTEXT,
4799 but it doesn't support writes. */
4802 linux_proc_xfer_partial (struct target_ops
*ops
, enum target_object object
,
4803 const char *annex
, gdb_byte
*readbuf
,
4804 const gdb_byte
*writebuf
,
4805 ULONGEST offset
, LONGEST len
)
4811 if (object
!= TARGET_OBJECT_MEMORY
|| !readbuf
)
4814 /* Don't bother for one word. */
4815 if (len
< 3 * sizeof (long))
4818 /* We could keep this file open and cache it - possibly one per
4819 thread. That requires some juggling, but is even faster. */
4820 sprintf (filename
, "/proc/%d/mem", PIDGET (inferior_ptid
));
4821 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4825 /* If pread64 is available, use it. It's faster if the kernel
4826 supports it (only one syscall), and it's 64-bit safe even on
4827 32-bit platforms (for instance, SPARC debugging a SPARC64
4830 if (pread64 (fd
, readbuf
, len
, offset
) != len
)
4832 if (lseek (fd
, offset
, SEEK_SET
) == -1 || read (fd
, readbuf
, len
) != len
)
4843 /* Enumerate spufs IDs for process PID. */
4845 spu_enumerate_spu_ids (int pid
, gdb_byte
*buf
, ULONGEST offset
, LONGEST len
)
4847 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch
);
4849 LONGEST written
= 0;
4852 struct dirent
*entry
;
4854 xsnprintf (path
, sizeof path
, "/proc/%d/fd", pid
);
4855 dir
= opendir (path
);
4860 while ((entry
= readdir (dir
)) != NULL
)
4866 fd
= atoi (entry
->d_name
);
4870 xsnprintf (path
, sizeof path
, "/proc/%d/fd/%d", pid
, fd
);
4871 if (stat (path
, &st
) != 0)
4873 if (!S_ISDIR (st
.st_mode
))
4876 if (statfs (path
, &stfs
) != 0)
4878 if (stfs
.f_type
!= SPUFS_MAGIC
)
4881 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
4883 store_unsigned_integer (buf
+ pos
- offset
, 4, byte_order
, fd
);
4893 /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU
4894 object type, using the /proc file system. */
4896 linux_proc_xfer_spu (struct target_ops
*ops
, enum target_object object
,
4897 const char *annex
, gdb_byte
*readbuf
,
4898 const gdb_byte
*writebuf
,
4899 ULONGEST offset
, LONGEST len
)
4904 int pid
= PIDGET (inferior_ptid
);
4911 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
4914 xsnprintf (buf
, sizeof buf
, "/proc/%d/fd/%s", pid
, annex
);
4915 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
4920 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4927 ret
= write (fd
, writebuf
, (size_t) len
);
4929 ret
= read (fd
, readbuf
, (size_t) len
);
4936 /* Parse LINE as a signal set and add its set bits to SIGS. */
4939 add_line_to_sigset (const char *line
, sigset_t
*sigs
)
4941 int len
= strlen (line
) - 1;
4945 if (line
[len
] != '\n')
4946 error (_("Could not parse signal set: %s"), line
);
4954 if (*p
>= '0' && *p
<= '9')
4956 else if (*p
>= 'a' && *p
<= 'f')
4957 digit
= *p
- 'a' + 10;
4959 error (_("Could not parse signal set: %s"), line
);
4964 sigaddset (sigs
, signum
+ 1);
4966 sigaddset (sigs
, signum
+ 2);
4968 sigaddset (sigs
, signum
+ 3);
4970 sigaddset (sigs
, signum
+ 4);
4976 /* Find process PID's pending signals from /proc/pid/status and set
4980 linux_proc_pending_signals (int pid
, sigset_t
*pending
,
4981 sigset_t
*blocked
, sigset_t
*ignored
)
4984 char buffer
[MAXPATHLEN
], fname
[MAXPATHLEN
];
4985 struct cleanup
*cleanup
;
4987 sigemptyset (pending
);
4988 sigemptyset (blocked
);
4989 sigemptyset (ignored
);
4990 sprintf (fname
, "/proc/%d/status", pid
);
4991 procfile
= fopen (fname
, "r");
4992 if (procfile
== NULL
)
4993 error (_("Could not open %s"), fname
);
4994 cleanup
= make_cleanup_fclose (procfile
);
4996 while (fgets (buffer
, MAXPATHLEN
, procfile
) != NULL
)
4998 /* Normal queued signals are on the SigPnd line in the status
4999 file. However, 2.6 kernels also have a "shared" pending
5000 queue for delivering signals to a thread group, so check for
5003 Unfortunately some Red Hat kernels include the shared pending
5004 queue but not the ShdPnd status field. */
5006 if (strncmp (buffer
, "SigPnd:\t", 8) == 0)
5007 add_line_to_sigset (buffer
+ 8, pending
);
5008 else if (strncmp (buffer
, "ShdPnd:\t", 8) == 0)
5009 add_line_to_sigset (buffer
+ 8, pending
);
5010 else if (strncmp (buffer
, "SigBlk:\t", 8) == 0)
5011 add_line_to_sigset (buffer
+ 8, blocked
);
5012 else if (strncmp (buffer
, "SigIgn:\t", 8) == 0)
5013 add_line_to_sigset (buffer
+ 8, ignored
);
5016 do_cleanups (cleanup
);
5020 linux_nat_xfer_osdata (struct target_ops
*ops
, enum target_object object
,
5021 const char *annex
, gdb_byte
*readbuf
,
5022 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
5024 /* We make the process list snapshot when the object starts to be
5026 static const char *buf
;
5027 static LONGEST len_avail
= -1;
5028 static struct obstack obstack
;
5032 gdb_assert (object
== TARGET_OBJECT_OSDATA
);
5038 if (len_avail
!= -1 && len_avail
!= 0)
5039 obstack_free (&obstack
, NULL
);
5042 obstack_init (&obstack
);
5043 obstack_grow_str (&obstack
, "<osdata type=\"types\">\n");
5045 obstack_xml_printf (&obstack
,
5047 "<column name=\"Type\">processes</column>"
5048 "<column name=\"Description\">"
5049 "Listing of all processes</column>"
5052 obstack_grow_str0 (&obstack
, "</osdata>\n");
5053 buf
= obstack_finish (&obstack
);
5054 len_avail
= strlen (buf
);
5057 if (offset
>= len_avail
)
5059 /* Done. Get rid of the obstack. */
5060 obstack_free (&obstack
, NULL
);
5066 if (len
> len_avail
- offset
)
5067 len
= len_avail
- offset
;
5068 memcpy (readbuf
, buf
+ offset
, len
);
5073 if (strcmp (annex
, "processes") != 0)
5076 gdb_assert (readbuf
&& !writebuf
);
5080 if (len_avail
!= -1 && len_avail
!= 0)
5081 obstack_free (&obstack
, NULL
);
5084 obstack_init (&obstack
);
5085 obstack_grow_str (&obstack
, "<osdata type=\"processes\">\n");
5087 dirp
= opendir ("/proc");
5092 while ((dp
= readdir (dirp
)) != NULL
)
5094 struct stat statbuf
;
5095 char procentry
[sizeof ("/proc/4294967295")];
5097 if (!isdigit (dp
->d_name
[0])
5098 || NAMELEN (dp
) > sizeof ("4294967295") - 1)
5101 sprintf (procentry
, "/proc/%s", dp
->d_name
);
5102 if (stat (procentry
, &statbuf
) == 0
5103 && S_ISDIR (statbuf
.st_mode
))
5107 char cmd
[MAXPATHLEN
+ 1];
5108 struct passwd
*entry
;
5110 pathname
= xstrprintf ("/proc/%s/cmdline", dp
->d_name
);
5111 entry
= getpwuid (statbuf
.st_uid
);
5113 if ((f
= fopen (pathname
, "r")) != NULL
)
5115 size_t length
= fread (cmd
, 1, sizeof (cmd
) - 1, f
);
5121 for (i
= 0; i
< length
; i
++)
5126 obstack_xml_printf (
5129 "<column name=\"pid\">%s</column>"
5130 "<column name=\"user\">%s</column>"
5131 "<column name=\"command\">%s</column>"
5134 entry
? entry
->pw_name
: "?",
5147 obstack_grow_str0 (&obstack
, "</osdata>\n");
5148 buf
= obstack_finish (&obstack
);
5149 len_avail
= strlen (buf
);
5152 if (offset
>= len_avail
)
5154 /* Done. Get rid of the obstack. */
5155 obstack_free (&obstack
, NULL
);
5161 if (len
> len_avail
- offset
)
5162 len
= len_avail
- offset
;
5163 memcpy (readbuf
, buf
+ offset
, len
);
5169 linux_xfer_partial (struct target_ops
*ops
, enum target_object object
,
5170 const char *annex
, gdb_byte
*readbuf
,
5171 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
5175 if (object
== TARGET_OBJECT_AUXV
)
5176 return memory_xfer_auxv (ops
, object
, annex
, readbuf
, writebuf
,
5179 if (object
== TARGET_OBJECT_OSDATA
)
5180 return linux_nat_xfer_osdata (ops
, object
, annex
, readbuf
, writebuf
,
5183 if (object
== TARGET_OBJECT_SPU
)
5184 return linux_proc_xfer_spu (ops
, object
, annex
, readbuf
, writebuf
,
5187 /* GDB calculates all the addresses in possibly larget width of the address.
5188 Address width needs to be masked before its final use - either by
5189 linux_proc_xfer_partial or inf_ptrace_xfer_partial.
5191 Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */
5193 if (object
== TARGET_OBJECT_MEMORY
)
5195 int addr_bit
= gdbarch_addr_bit (target_gdbarch
);
5197 if (addr_bit
< (sizeof (ULONGEST
) * HOST_CHAR_BIT
))
5198 offset
&= ((ULONGEST
) 1 << addr_bit
) - 1;
5201 xfer
= linux_proc_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5206 return super_xfer_partial (ops
, object
, annex
, readbuf
, writebuf
,
5210 /* Create a prototype generic GNU/Linux target. The client can override
5211 it with local methods. */
5214 linux_target_install_ops (struct target_ops
*t
)
5216 t
->to_insert_fork_catchpoint
= linux_child_insert_fork_catchpoint
;
5217 t
->to_insert_vfork_catchpoint
= linux_child_insert_vfork_catchpoint
;
5218 t
->to_insert_exec_catchpoint
= linux_child_insert_exec_catchpoint
;
5219 t
->to_set_syscall_catchpoint
= linux_child_set_syscall_catchpoint
;
5220 t
->to_pid_to_exec_file
= linux_child_pid_to_exec_file
;
5221 t
->to_post_startup_inferior
= linux_child_post_startup_inferior
;
5222 t
->to_post_attach
= linux_child_post_attach
;
5223 t
->to_follow_fork
= linux_child_follow_fork
;
5224 t
->to_find_memory_regions
= linux_nat_find_memory_regions
;
5225 t
->to_make_corefile_notes
= linux_nat_make_corefile_notes
;
5227 super_xfer_partial
= t
->to_xfer_partial
;
5228 t
->to_xfer_partial
= linux_xfer_partial
;
5234 struct target_ops
*t
;
5236 t
= inf_ptrace_target ();
5237 linux_target_install_ops (t
);
5243 linux_trad_target (CORE_ADDR (*register_u_offset
)(struct gdbarch
*, int, int))
5245 struct target_ops
*t
;
5247 t
= inf_ptrace_trad_target (register_u_offset
);
5248 linux_target_install_ops (t
);
5253 /* target_is_async_p implementation. */
5256 linux_nat_is_async_p (void)
5258 /* NOTE: palves 2008-03-21: We're only async when the user requests
5259 it explicitly with the "set target-async" command.
5260 Someday, linux will always be async. */
5261 if (!target_async_permitted
)
5264 /* See target.h/target_async_mask. */
5265 return linux_nat_async_mask_value
;
5268 /* target_can_async_p implementation. */
5271 linux_nat_can_async_p (void)
5273 /* NOTE: palves 2008-03-21: We're only async when the user requests
5274 it explicitly with the "set target-async" command.
5275 Someday, linux will always be async. */
5276 if (!target_async_permitted
)
5279 /* See target.h/target_async_mask. */
5280 return linux_nat_async_mask_value
;
5284 linux_nat_supports_non_stop (void)
5289 /* True if we want to support multi-process. To be removed when GDB
5290 supports multi-exec. */
5292 int linux_multi_process
= 1;
5295 linux_nat_supports_multi_process (void)
5297 return linux_multi_process
;
5300 /* target_async_mask implementation. */
5303 linux_nat_async_mask (int new_mask
)
5305 int curr_mask
= linux_nat_async_mask_value
;
5307 if (curr_mask
!= new_mask
)
5311 linux_nat_async (NULL
, 0);
5312 linux_nat_async_mask_value
= new_mask
;
5316 linux_nat_async_mask_value
= new_mask
;
5318 /* If we're going out of async-mask in all-stop, then the
5319 inferior is stopped. The next resume will call
5320 target_async. In non-stop, the target event source
5321 should be always registered in the event loop. Do so
5324 linux_nat_async (inferior_event_handler
, 0);
5331 static int async_terminal_is_ours
= 1;
5333 /* target_terminal_inferior implementation. */
5336 linux_nat_terminal_inferior (void)
5338 if (!target_is_async_p ())
5340 /* Async mode is disabled. */
5341 terminal_inferior ();
5345 terminal_inferior ();
5347 /* Calls to target_terminal_*() are meant to be idempotent. */
5348 if (!async_terminal_is_ours
)
5351 delete_file_handler (input_fd
);
5352 async_terminal_is_ours
= 0;
5356 /* target_terminal_ours implementation. */
5359 linux_nat_terminal_ours (void)
5361 if (!target_is_async_p ())
5363 /* Async mode is disabled. */
5368 /* GDB should never give the terminal to the inferior if the
5369 inferior is running in the background (run&, continue&, etc.),
5370 but claiming it sure should. */
5373 if (async_terminal_is_ours
)
5376 clear_sigint_trap ();
5377 add_file_handler (input_fd
, stdin_event_handler
, 0);
5378 async_terminal_is_ours
= 1;
5381 static void (*async_client_callback
) (enum inferior_event_type event_type
,
5383 static void *async_client_context
;
5385 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5386 so we notice when any child changes state, and notify the
5387 event-loop; it allows us to use sigsuspend in linux_nat_wait_1
5388 above to wait for the arrival of a SIGCHLD. */
5391 sigchld_handler (int signo
)
5393 int old_errno
= errno
;
5395 if (debug_linux_nat_async
)
5396 fprintf_unfiltered (gdb_stdlog
, "sigchld\n");
5398 if (signo
== SIGCHLD
5399 && linux_nat_event_pipe
[0] != -1)
5400 async_file_mark (); /* Let the event loop know that there are
5401 events to handle. */
5406 /* Callback registered with the target events file descriptor. */
5409 handle_target_event (int error
, gdb_client_data client_data
)
5411 (*async_client_callback
) (INF_REG_EVENT
, async_client_context
);
5414 /* Create/destroy the target events pipe. Returns previous state. */
5417 linux_async_pipe (int enable
)
5419 int previous
= (linux_nat_event_pipe
[0] != -1);
5421 if (previous
!= enable
)
5425 block_child_signals (&prev_mask
);
5429 if (pipe (linux_nat_event_pipe
) == -1)
5430 internal_error (__FILE__
, __LINE__
,
5431 "creating event pipe failed.");
5433 fcntl (linux_nat_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5434 fcntl (linux_nat_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5438 close (linux_nat_event_pipe
[0]);
5439 close (linux_nat_event_pipe
[1]);
5440 linux_nat_event_pipe
[0] = -1;
5441 linux_nat_event_pipe
[1] = -1;
5444 restore_child_signals_mask (&prev_mask
);
5450 /* target_async implementation. */
5453 linux_nat_async (void (*callback
) (enum inferior_event_type event_type
,
5454 void *context
), void *context
)
5456 if (linux_nat_async_mask_value
== 0 || !target_async_permitted
)
5457 internal_error (__FILE__
, __LINE__
,
5458 "Calling target_async when async is masked");
5460 if (callback
!= NULL
)
5462 async_client_callback
= callback
;
5463 async_client_context
= context
;
5464 if (!linux_async_pipe (1))
5466 add_file_handler (linux_nat_event_pipe
[0],
5467 handle_target_event
, NULL
);
5468 /* There may be pending events to handle. Tell the event loop
5475 async_client_callback
= callback
;
5476 async_client_context
= context
;
5477 delete_file_handler (linux_nat_event_pipe
[0]);
5478 linux_async_pipe (0);
5483 /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other
5487 linux_nat_stop_lwp (struct lwp_info
*lwp
, void *data
)
5491 ptid_t ptid
= lwp
->ptid
;
5493 if (debug_linux_nat
)
5494 fprintf_unfiltered (gdb_stdlog
,
5495 "LNSL: running -> suspending %s\n",
5496 target_pid_to_str (lwp
->ptid
));
5499 stop_callback (lwp
, NULL
);
5500 stop_wait_callback (lwp
, NULL
);
5502 /* If the lwp exits while we try to stop it, there's nothing
5504 lwp
= find_lwp_pid (ptid
);
5508 /* If we didn't collect any signal other than SIGSTOP while
5509 stopping the LWP, push a SIGNAL_0 event. In either case, the
5510 event-loop will end up calling target_wait which will collect
5512 if (lwp
->status
== 0)
5513 lwp
->status
= W_STOPCODE (0);
5518 /* Already known to be stopped; do nothing. */
5520 if (debug_linux_nat
)
5522 if (find_thread_ptid (lwp
->ptid
)->stop_requested
)
5523 fprintf_unfiltered (gdb_stdlog
,
5524 "LNSL: already stopped/stop_requested %s\n",
5525 target_pid_to_str (lwp
->ptid
));
5527 fprintf_unfiltered (gdb_stdlog
,
5528 "LNSL: already stopped/no "
5529 "stop_requested yet %s\n",
5530 target_pid_to_str (lwp
->ptid
));
5537 linux_nat_stop (ptid_t ptid
)
5540 iterate_over_lwps (ptid
, linux_nat_stop_lwp
, NULL
);
5542 linux_ops
->to_stop (ptid
);
5546 linux_nat_close (int quitting
)
5548 /* Unregister from the event loop. */
5549 if (target_is_async_p ())
5550 target_async (NULL
, 0);
5552 /* Reset the async_masking. */
5553 linux_nat_async_mask_value
= 1;
5555 if (linux_ops
->to_close
)
5556 linux_ops
->to_close (quitting
);
5559 /* When requests are passed down from the linux-nat layer to the
5560 single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are
5561 used. The address space pointer is stored in the inferior object,
5562 but the common code that is passed such ptid can't tell whether
5563 lwpid is a "main" process id or not (it assumes so). We reverse
5564 look up the "main" process id from the lwp here. */
5566 struct address_space
*
5567 linux_nat_thread_address_space (struct target_ops
*t
, ptid_t ptid
)
5569 struct lwp_info
*lwp
;
5570 struct inferior
*inf
;
5573 pid
= GET_LWP (ptid
);
5574 if (GET_LWP (ptid
) == 0)
5576 /* An (lwpid,0,0) ptid. Look up the lwp object to get at the
5578 lwp
= find_lwp_pid (ptid
);
5579 pid
= GET_PID (lwp
->ptid
);
5583 /* A (pid,lwpid,0) ptid. */
5584 pid
= GET_PID (ptid
);
5587 inf
= find_inferior_pid (pid
);
5588 gdb_assert (inf
!= NULL
);
5593 linux_nat_core_of_thread_1 (ptid_t ptid
)
5595 struct cleanup
*back_to
;
5598 char *content
= NULL
;
5601 int content_read
= 0;
5605 filename
= xstrprintf ("/proc/%d/task/%ld/stat",
5606 GET_PID (ptid
), GET_LWP (ptid
));
5607 back_to
= make_cleanup (xfree
, filename
);
5609 f
= fopen (filename
, "r");
5612 do_cleanups (back_to
);
5616 make_cleanup_fclose (f
);
5622 content
= xrealloc (content
, content_read
+ 1024);
5623 n
= fread (content
+ content_read
, 1, 1024, f
);
5627 content
[content_read
] = '\0';
5632 make_cleanup (xfree
, content
);
5634 p
= strchr (content
, '(');
5638 p
= strchr (p
, ')');
5642 /* If the first field after program name has index 0, then core number is
5643 the field with index 36. There's no constant for that anywhere. */
5645 p
= strtok_r (p
, " ", &ts
);
5646 for (i
= 0; p
!= NULL
&& i
!= 36; ++i
)
5647 p
= strtok_r (NULL
, " ", &ts
);
5649 if (p
== NULL
|| sscanf (p
, "%d", &core
) == 0)
5652 do_cleanups (back_to
);
5657 /* Return the cached value of the processor core for thread PTID. */
5660 linux_nat_core_of_thread (struct target_ops
*ops
, ptid_t ptid
)
5662 struct lwp_info
*info
= find_lwp_pid (ptid
);
5670 linux_nat_add_target (struct target_ops
*t
)
5672 /* Save the provided single-threaded target. We save this in a separate
5673 variable because another target we've inherited from (e.g. inf-ptrace)
5674 may have saved a pointer to T; we want to use it for the final
5675 process stratum target. */
5676 linux_ops_saved
= *t
;
5677 linux_ops
= &linux_ops_saved
;
5679 /* Override some methods for multithreading. */
5680 t
->to_create_inferior
= linux_nat_create_inferior
;
5681 t
->to_attach
= linux_nat_attach
;
5682 t
->to_detach
= linux_nat_detach
;
5683 t
->to_resume
= linux_nat_resume
;
5684 t
->to_wait
= linux_nat_wait
;
5685 t
->to_pass_signals
= linux_nat_pass_signals
;
5686 t
->to_xfer_partial
= linux_nat_xfer_partial
;
5687 t
->to_kill
= linux_nat_kill
;
5688 t
->to_mourn_inferior
= linux_nat_mourn_inferior
;
5689 t
->to_thread_alive
= linux_nat_thread_alive
;
5690 t
->to_pid_to_str
= linux_nat_pid_to_str
;
5691 t
->to_thread_name
= linux_nat_thread_name
;
5692 t
->to_has_thread_control
= tc_schedlock
;
5693 t
->to_thread_address_space
= linux_nat_thread_address_space
;
5694 t
->to_stopped_by_watchpoint
= linux_nat_stopped_by_watchpoint
;
5695 t
->to_stopped_data_address
= linux_nat_stopped_data_address
;
5697 t
->to_can_async_p
= linux_nat_can_async_p
;
5698 t
->to_is_async_p
= linux_nat_is_async_p
;
5699 t
->to_supports_non_stop
= linux_nat_supports_non_stop
;
5700 t
->to_async
= linux_nat_async
;
5701 t
->to_async_mask
= linux_nat_async_mask
;
5702 t
->to_terminal_inferior
= linux_nat_terminal_inferior
;
5703 t
->to_terminal_ours
= linux_nat_terminal_ours
;
5704 t
->to_close
= linux_nat_close
;
5706 /* Methods for non-stop support. */
5707 t
->to_stop
= linux_nat_stop
;
5709 t
->to_supports_multi_process
= linux_nat_supports_multi_process
;
5711 t
->to_core_of_thread
= linux_nat_core_of_thread
;
5713 /* We don't change the stratum; this target will sit at
5714 process_stratum and thread_db will set at thread_stratum. This
5715 is a little strange, since this is a multi-threaded-capable
5716 target, but we want to be on the stack below thread_db, and we
5717 also want to be used for single-threaded processes. */
5722 /* Register a method to call whenever a new thread is attached. */
5724 linux_nat_set_new_thread (struct target_ops
*t
, void (*new_thread
) (ptid_t
))
5726 /* Save the pointer. We only support a single registered instance
5727 of the GNU/Linux native target, so we do not need to map this to
5729 linux_nat_new_thread
= new_thread
;
5732 /* Register a method that converts a siginfo object between the layout
5733 that ptrace returns, and the layout in the architecture of the
5736 linux_nat_set_siginfo_fixup (struct target_ops
*t
,
5737 int (*siginfo_fixup
) (struct siginfo
*,
5741 /* Save the pointer. */
5742 linux_nat_siginfo_fixup
= siginfo_fixup
;
5745 /* Return the saved siginfo associated with PTID. */
5747 linux_nat_get_siginfo (ptid_t ptid
)
5749 struct lwp_info
*lp
= find_lwp_pid (ptid
);
5751 gdb_assert (lp
!= NULL
);
5753 return &lp
->siginfo
;
5756 /* Provide a prototype to silence -Wmissing-prototypes. */
5757 extern initialize_file_ftype _initialize_linux_nat
;
5760 _initialize_linux_nat (void)
5762 add_info ("proc", linux_nat_info_proc_cmd
, _("\
5763 Show /proc process information about any running process.\n\
5764 Specify any process id, or use the program being debugged by default.\n\
5765 Specify any of the following keywords for detailed info:\n\
5766 mappings -- list of mapped memory regions.\n\
5767 stat -- list a bunch of random process info.\n\
5768 status -- list a different bunch of random process info.\n\
5769 all -- list all available /proc info."));
5771 add_setshow_zinteger_cmd ("lin-lwp", class_maintenance
,
5772 &debug_linux_nat
, _("\
5773 Set debugging of GNU/Linux lwp module."), _("\
5774 Show debugging of GNU/Linux lwp module."), _("\
5775 Enables printf debugging output."),
5777 show_debug_linux_nat
,
5778 &setdebuglist
, &showdebuglist
);
5780 add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance
,
5781 &debug_linux_nat_async
, _("\
5782 Set debugging of GNU/Linux async lwp module."), _("\
5783 Show debugging of GNU/Linux async lwp module."), _("\
5784 Enables printf debugging output."),
5786 show_debug_linux_nat_async
,
5787 &setdebuglist
, &showdebuglist
);
5789 /* Save this mask as the default. */
5790 sigprocmask (SIG_SETMASK
, NULL
, &normal_mask
);
5792 /* Install a SIGCHLD handler. */
5793 sigchld_action
.sa_handler
= sigchld_handler
;
5794 sigemptyset (&sigchld_action
.sa_mask
);
5795 sigchld_action
.sa_flags
= SA_RESTART
;
5797 /* Make it the default. */
5798 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
5800 /* Make sure we don't block SIGCHLD during a sigsuspend. */
5801 sigprocmask (SIG_SETMASK
, NULL
, &suspend_mask
);
5802 sigdelset (&suspend_mask
, SIGCHLD
);
5804 sigemptyset (&blocked_mask
);
5806 add_setshow_boolean_cmd ("disable-randomization", class_support
,
5807 &disable_randomization
, _("\
5808 Set disabling of debuggee's virtual address space randomization."), _("\
5809 Show disabling of debuggee's virtual address space randomization."), _("\
5810 When this mode is on (which is the default), randomization of the virtual\n\
5811 address space is disabled. Standalone programs run with the randomization\n\
5812 enabled by default on some platforms."),
5813 &set_disable_randomization
,
5814 &show_disable_randomization
,
5815 &setlist
, &showlist
);
5819 /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
5820 the GNU/Linux Threads library and therefore doesn't really belong
5823 /* Read variable NAME in the target and return its value if found.
5824 Otherwise return zero. It is assumed that the type of the variable
5828 get_signo (const char *name
)
5830 struct minimal_symbol
*ms
;
5833 ms
= lookup_minimal_symbol (name
, NULL
, NULL
);
5837 if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms
), (gdb_byte
*) &signo
,
5838 sizeof (signo
)) != 0)
5844 /* Return the set of signals used by the threads library in *SET. */
5847 lin_thread_get_thread_signals (sigset_t
*set
)
5849 struct sigaction action
;
5850 int restart
, cancel
;
5852 sigemptyset (&blocked_mask
);
5855 restart
= get_signo ("__pthread_sig_restart");
5856 cancel
= get_signo ("__pthread_sig_cancel");
5858 /* LinuxThreads normally uses the first two RT signals, but in some legacy
5859 cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does
5860 not provide any way for the debugger to query the signal numbers -
5861 fortunately they don't change! */
5864 restart
= __SIGRTMIN
;
5867 cancel
= __SIGRTMIN
+ 1;
5869 sigaddset (set
, restart
);
5870 sigaddset (set
, cancel
);
5872 /* The GNU/Linux Threads library makes terminating threads send a
5873 special "cancel" signal instead of SIGCHLD. Make sure we catch
5874 those (to prevent them from terminating GDB itself, which is
5875 likely to be their default action) and treat them the same way as
5878 action
.sa_handler
= sigchld_handler
;
5879 sigemptyset (&action
.sa_mask
);
5880 action
.sa_flags
= SA_RESTART
;
5881 sigaction (cancel
, &action
, NULL
);
5883 /* We block the "cancel" signal throughout this code ... */
5884 sigaddset (&blocked_mask
, cancel
);
5885 sigprocmask (SIG_BLOCK
, &blocked_mask
, NULL
);
5887 /* ... except during a sigsuspend. */
5888 sigdelset (&suspend_mask
, cancel
);