1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
3 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "linux-low.h"
25 #include <sys/param.h>
26 #include <sys/ptrace.h>
28 #include <sys/ioctl.h>
34 #include <sys/syscall.h>
38 #include <sys/types.h>
43 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
44 then ELFMAG0 will have been defined. If it didn't get included by
45 gdb_proc_service.h then including it will likely introduce a duplicate
46 definition of elf_fpregset_t. */
51 #define SPUFS_MAGIC 0x23c9b64e
54 #ifndef PTRACE_GETSIGINFO
55 # define PTRACE_GETSIGINFO 0x4202
56 # define PTRACE_SETSIGINFO 0x4203
63 /* If the system headers did not provide the constants, hard-code the normal
65 #ifndef PTRACE_EVENT_FORK
67 #define PTRACE_SETOPTIONS 0x4200
68 #define PTRACE_GETEVENTMSG 0x4201
70 /* options set using PTRACE_SETOPTIONS */
71 #define PTRACE_O_TRACESYSGOOD 0x00000001
72 #define PTRACE_O_TRACEFORK 0x00000002
73 #define PTRACE_O_TRACEVFORK 0x00000004
74 #define PTRACE_O_TRACECLONE 0x00000008
75 #define PTRACE_O_TRACEEXEC 0x00000010
76 #define PTRACE_O_TRACEVFORKDONE 0x00000020
77 #define PTRACE_O_TRACEEXIT 0x00000040
79 /* Wait extended result codes for the above trace options. */
80 #define PTRACE_EVENT_FORK 1
81 #define PTRACE_EVENT_VFORK 2
82 #define PTRACE_EVENT_CLONE 3
83 #define PTRACE_EVENT_EXEC 4
84 #define PTRACE_EVENT_VFORK_DONE 5
85 #define PTRACE_EVENT_EXIT 6
87 #endif /* PTRACE_EVENT_FORK */
89 /* We can't always assume that this flag is available, but all systems
90 with the ptrace event handlers also have __WALL, so it's safe to use
93 #define __WALL 0x40000000 /* Wait for any child. */
97 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
101 #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
106 /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol
107 representation of the thread ID.
109 ``all_lwps'' is keyed by the process ID - which on Linux is (presently)
110 the same as the LWP ID.
112 ``all_processes'' is keyed by the "overall process ID", which
113 GNU/Linux calls tgid, "thread group ID". */
115 struct inferior_list all_lwps
;
117 /* A list of all unknown processes which receive stop signals. Some other
118 process will presumably claim each of these as forked children
121 struct inferior_list stopped_pids
;
123 /* FIXME this is a bit of a hack, and could be removed. */
124 int stopping_threads
;
126 /* FIXME make into a target method? */
127 int using_threads
= 1;
129 /* This flag is true iff we've just created or attached to our first
130 inferior but it has not stopped yet. As soon as it does, we need
131 to call the low target's arch_setup callback. Doing this only on
132 the first inferior avoids reinializing the architecture on every
133 inferior, and avoids messing with the register caches of the
134 already running inferiors. NOTE: this assumes all inferiors under
135 control of gdbserver have the same architecture. */
136 static int new_inferior
;
138 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
139 int step
, int signal
, siginfo_t
*info
);
140 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
141 static void stop_all_lwps (void);
142 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
143 static int check_removed_breakpoint (struct lwp_info
*event_child
);
144 static void *add_lwp (ptid_t ptid
);
145 static int linux_stopped_by_watchpoint (void);
146 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
147 static int linux_core_of_thread (ptid_t ptid
);
149 struct pending_signals
153 struct pending_signals
*prev
;
156 #define PTRACE_ARG3_TYPE void *
157 #define PTRACE_ARG4_TYPE void *
158 #define PTRACE_XFER_TYPE long
160 #ifdef HAVE_LINUX_REGSETS
161 static char *disabled_regsets
;
162 static int num_regsets
;
165 /* The read/write ends of the pipe registered as waitable file in the
167 static int linux_event_pipe
[2] = { -1, -1 };
169 /* True if we're currently in async mode. */
170 #define target_is_async_p() (linux_event_pipe[0] != -1)
172 static void send_sigstop (struct inferior_list_entry
*entry
);
173 static void wait_for_sigstop (struct inferior_list_entry
*entry
);
175 /* Accepts an integer PID; Returns a string representing a file that
176 can be opened to get info for the child process.
177 Space for the result is malloc'd, caller must free. */
180 linux_child_pid_to_exec_file (int pid
)
184 name1
= xmalloc (MAXPATHLEN
);
185 name2
= xmalloc (MAXPATHLEN
);
186 memset (name2
, 0, MAXPATHLEN
);
188 sprintf (name1
, "/proc/%d/exe", pid
);
189 if (readlink (name1
, name2
, MAXPATHLEN
) > 0)
201 /* Return non-zero if HEADER is a 64-bit ELF file. */
204 elf_64_header_p (const Elf64_Ehdr
*header
)
206 return (header
->e_ident
[EI_MAG0
] == ELFMAG0
207 && header
->e_ident
[EI_MAG1
] == ELFMAG1
208 && header
->e_ident
[EI_MAG2
] == ELFMAG2
209 && header
->e_ident
[EI_MAG3
] == ELFMAG3
210 && header
->e_ident
[EI_CLASS
] == ELFCLASS64
);
213 /* Return non-zero if FILE is a 64-bit ELF file,
214 zero if the file is not a 64-bit ELF file,
215 and -1 if the file is not accessible or doesn't exist. */
218 elf_64_file_p (const char *file
)
223 fd
= open (file
, O_RDONLY
);
227 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
234 return elf_64_header_p (&header
);
238 delete_lwp (struct lwp_info
*lwp
)
240 remove_thread (get_lwp_thread (lwp
));
241 remove_inferior (&all_lwps
, &lwp
->head
);
242 free (lwp
->arch_private
);
246 /* Add a process to the common process list, and set its private
249 static struct process_info
*
250 linux_add_process (int pid
, int attached
)
252 struct process_info
*proc
;
254 /* Is this the first process? If so, then set the arch. */
255 if (all_processes
.head
== NULL
)
258 proc
= add_process (pid
, attached
);
259 proc
->private = xcalloc (1, sizeof (*proc
->private));
261 if (the_low_target
.new_process
!= NULL
)
262 proc
->private->arch_private
= the_low_target
.new_process ();
267 /* Remove a process from the common process list,
268 also freeing all private data. */
271 linux_remove_process (struct process_info
*process
)
273 struct process_info_private
*priv
= process
->private;
275 free (priv
->arch_private
);
277 remove_process (process
);
280 /* Wrapper function for waitpid which handles EINTR, and emulates
281 __WALL for systems where that is not available. */
284 my_waitpid (int pid
, int *status
, int flags
)
289 fprintf (stderr
, "my_waitpid (%d, 0x%x)\n", pid
, flags
);
293 sigset_t block_mask
, org_mask
, wake_mask
;
296 wnohang
= (flags
& WNOHANG
) != 0;
297 flags
&= ~(__WALL
| __WCLONE
);
300 /* Block all signals while here. This avoids knowing about
301 LinuxThread's signals. */
302 sigfillset (&block_mask
);
303 sigprocmask (SIG_BLOCK
, &block_mask
, &org_mask
);
305 /* ... except during the sigsuspend below. */
306 sigemptyset (&wake_mask
);
310 /* Since all signals are blocked, there's no need to check
312 ret
= waitpid (pid
, status
, flags
);
315 if (ret
== -1 && out_errno
!= ECHILD
)
320 if (flags
& __WCLONE
)
322 /* We've tried both flavors now. If WNOHANG is set,
323 there's nothing else to do, just bail out. */
328 fprintf (stderr
, "blocking\n");
330 /* Block waiting for signals. */
331 sigsuspend (&wake_mask
);
337 sigprocmask (SIG_SETMASK
, &org_mask
, NULL
);
342 ret
= waitpid (pid
, status
, flags
);
343 while (ret
== -1 && errno
== EINTR
);
348 fprintf (stderr
, "my_waitpid (%d, 0x%x): status(%x), %d\n",
349 pid
, flags
, status
? *status
: -1, ret
);
355 /* Handle a GNU/Linux extended wait response. If we see a clone
356 event, we need to add the new LWP to our list (and not report the
357 trap to higher layers). */
360 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
362 int event
= wstat
>> 16;
363 struct lwp_info
*new_lwp
;
365 if (event
== PTRACE_EVENT_CLONE
)
368 unsigned long new_pid
;
369 int ret
, status
= W_STOPCODE (SIGSTOP
);
371 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_child
), 0, &new_pid
);
373 /* If we haven't already seen the new PID stop, wait for it now. */
374 if (! pull_pid_from_list (&stopped_pids
, new_pid
))
376 /* The new child has a pending SIGSTOP. We can't affect it until it
377 hits the SIGSTOP, but we're already attached. */
379 ret
= my_waitpid (new_pid
, &status
, __WALL
);
382 perror_with_name ("waiting for new child");
383 else if (ret
!= new_pid
)
384 warning ("wait returned unexpected PID %d", ret
);
385 else if (!WIFSTOPPED (status
))
386 warning ("wait returned unexpected status 0x%x", status
);
389 ptrace (PTRACE_SETOPTIONS
, new_pid
, 0, (PTRACE_ARG4_TYPE
) PTRACE_O_TRACECLONE
);
391 ptid
= ptid_build (pid_of (event_child
), new_pid
, 0);
392 new_lwp
= (struct lwp_info
*) add_lwp (ptid
);
393 add_thread (ptid
, new_lwp
);
395 /* Either we're going to immediately resume the new thread
396 or leave it stopped. linux_resume_one_lwp is a nop if it
397 thinks the thread is currently running, so set this first
398 before calling linux_resume_one_lwp. */
399 new_lwp
->stopped
= 1;
401 /* Normally we will get the pending SIGSTOP. But in some cases
402 we might get another signal delivered to the group first.
403 If we do get another signal, be sure not to lose it. */
404 if (WSTOPSIG (status
) == SIGSTOP
)
406 if (! stopping_threads
)
407 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
411 new_lwp
->stop_expected
= 1;
412 if (stopping_threads
)
414 new_lwp
->status_pending_p
= 1;
415 new_lwp
->status_pending
= status
;
418 /* Pass the signal on. This is what GDB does - except
419 shouldn't we really report it instead? */
420 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
423 /* Always resume the current thread. If we are stopping
424 threads, it will have a pending SIGSTOP; we may as well
426 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
430 /* This function should only be called if the process got a SIGTRAP.
431 The SIGTRAP could mean several things.
433 On i386, where decr_pc_after_break is non-zero:
434 If we were single-stepping this process using PTRACE_SINGLESTEP,
435 we will get only the one SIGTRAP (even if the instruction we
436 stepped over was a breakpoint). The value of $eip will be the
438 If we continue the process using PTRACE_CONT, we will get a
439 SIGTRAP when we hit a breakpoint. The value of $eip will be
440 the instruction after the breakpoint (i.e. needs to be
441 decremented). If we report the SIGTRAP to GDB, we must also
442 report the undecremented PC. If we cancel the SIGTRAP, we
443 must resume at the decremented PC.
445 (Presumably, not yet tested) On a non-decr_pc_after_break machine
446 with hardware or kernel single-step:
447 If we single-step over a breakpoint instruction, our PC will
448 point at the following instruction. If we continue and hit a
449 breakpoint instruction, our PC will point at the breakpoint
455 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
456 CORE_ADDR stop_pc
= (*the_low_target
.get_pc
) (regcache
);
458 if (! get_thread_lwp (current_inferior
)->stepping
459 && WSTOPSIG (get_thread_lwp (current_inferior
)->last_status
) == SIGTRAP
)
460 stop_pc
-= the_low_target
.decr_pc_after_break
;
463 fprintf (stderr
, "stop pc is 0x%lx\n", (long) stop_pc
);
469 add_lwp (ptid_t ptid
)
471 struct lwp_info
*lwp
;
473 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
474 memset (lwp
, 0, sizeof (*lwp
));
478 if (the_low_target
.new_thread
!= NULL
)
479 lwp
->arch_private
= the_low_target
.new_thread ();
481 add_inferior_to_list (&all_lwps
, &lwp
->head
);
486 /* Start an inferior process and returns its pid.
487 ALLARGS is a vector of program-name and args. */
490 linux_create_inferior (char *program
, char **allargs
)
492 struct lwp_info
*new_lwp
;
496 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
502 perror_with_name ("fork");
506 ptrace (PTRACE_TRACEME
, 0, 0, 0);
508 #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */
509 signal (__SIGRTMIN
+ 1, SIG_DFL
);
514 execv (program
, allargs
);
516 execvp (program
, allargs
);
518 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
524 linux_add_process (pid
, 0);
526 ptid
= ptid_build (pid
, pid
, 0);
527 new_lwp
= add_lwp (ptid
);
528 add_thread (ptid
, new_lwp
);
529 new_lwp
->must_set_ptrace_flags
= 1;
534 /* Attach to an inferior process. */
537 linux_attach_lwp_1 (unsigned long lwpid
, int initial
)
540 struct lwp_info
*new_lwp
;
542 if (ptrace (PTRACE_ATTACH
, lwpid
, 0, 0) != 0)
546 /* If we fail to attach to an LWP, just warn. */
547 fprintf (stderr
, "Cannot attach to lwp %ld: %s (%d)\n", lwpid
,
548 strerror (errno
), errno
);
553 /* If we fail to attach to a process, report an error. */
554 error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid
,
555 strerror (errno
), errno
);
559 /* NOTE/FIXME: This lwp might have not been the tgid. */
560 ptid
= ptid_build (lwpid
, lwpid
, 0);
563 /* Note that extracting the pid from the current inferior is
564 safe, since we're always called in the context of the same
565 process as this new thread. */
566 int pid
= pid_of (get_thread_lwp (current_inferior
));
567 ptid
= ptid_build (pid
, lwpid
, 0);
570 new_lwp
= (struct lwp_info
*) add_lwp (ptid
);
571 add_thread (ptid
, new_lwp
);
573 /* We need to wait for SIGSTOP before being able to make the next
574 ptrace call on this LWP. */
575 new_lwp
->must_set_ptrace_flags
= 1;
577 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
580 There are several cases to consider here:
582 1) gdbserver has already attached to the process and is being notified
583 of a new thread that is being created.
584 In this case we should ignore that SIGSTOP and resume the process.
585 This is handled below by setting stop_expected = 1.
587 2) This is the first thread (the process thread), and we're attaching
588 to it via attach_inferior.
589 In this case we want the process thread to stop.
590 This is handled by having linux_attach clear stop_expected after
592 ??? If the process already has several threads we leave the other
595 3) GDB is connecting to gdbserver and is requesting an enumeration of all
597 In this case we want the thread to stop.
598 FIXME: This case is currently not properly handled.
599 We should wait for the SIGSTOP but don't. Things work apparently
600 because enough time passes between when we ptrace (ATTACH) and when
601 gdb makes the next ptrace call on the thread.
603 On the other hand, if we are currently trying to stop all threads, we
604 should treat the new thread as if we had sent it a SIGSTOP. This works
605 because we are guaranteed that the add_lwp call above added us to the
606 end of the list, and so the new thread has not yet reached
607 wait_for_sigstop (but will). */
608 if (! stopping_threads
)
609 new_lwp
->stop_expected
= 1;
613 linux_attach_lwp (unsigned long lwpid
)
615 linux_attach_lwp_1 (lwpid
, 0);
619 linux_attach (unsigned long pid
)
621 struct lwp_info
*lwp
;
623 linux_attach_lwp_1 (pid
, 1);
625 linux_add_process (pid
, 1);
629 /* Don't ignore the initial SIGSTOP if we just attached to this
630 process. It will be collected by wait shortly. */
631 lwp
= (struct lwp_info
*) find_inferior_id (&all_lwps
,
632 ptid_build (pid
, pid
, 0));
633 lwp
->stop_expected
= 0;
646 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
648 struct counter
*counter
= args
;
650 if (ptid_get_pid (entry
->id
) == counter
->pid
)
652 if (++counter
->count
> 1)
660 last_thread_of_process_p (struct thread_info
*thread
)
662 ptid_t ptid
= ((struct inferior_list_entry
*)thread
)->id
;
663 int pid
= ptid_get_pid (ptid
);
664 struct counter counter
= { pid
, 0 };
666 return (find_inferior (&all_threads
,
667 second_thread_of_pid_p
, &counter
) == NULL
);
670 /* Kill the inferior lwp. */
673 linux_kill_one_lwp (struct inferior_list_entry
*entry
, void *args
)
675 struct thread_info
*thread
= (struct thread_info
*) entry
;
676 struct lwp_info
*lwp
= get_thread_lwp (thread
);
678 int pid
= * (int *) args
;
680 if (ptid_get_pid (entry
->id
) != pid
)
683 /* We avoid killing the first thread here, because of a Linux kernel (at
684 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
685 the children get a chance to be reaped, it will remain a zombie
688 if (lwpid_of (lwp
) == pid
)
691 fprintf (stderr
, "lkop: is last of process %s\n",
692 target_pid_to_str (entry
->id
));
696 /* If we're killing a running inferior, make sure it is stopped
697 first, as PTRACE_KILL will not work otherwise. */
699 send_sigstop (&lwp
->head
);
703 ptrace (PTRACE_KILL
, lwpid_of (lwp
), 0, 0);
705 /* Make sure it died. The loop is most likely unnecessary. */
706 pid
= linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
707 } while (pid
> 0 && WIFSTOPPED (wstat
));
715 struct process_info
*process
;
716 struct lwp_info
*lwp
;
717 struct thread_info
*thread
;
721 process
= find_process_pid (pid
);
725 find_inferior (&all_threads
, linux_kill_one_lwp
, &pid
);
727 /* See the comment in linux_kill_one_lwp. We did not kill the first
728 thread in the list, so do so now. */
729 lwp
= find_lwp_pid (pid_to_ptid (pid
));
730 thread
= get_lwp_thread (lwp
);
733 fprintf (stderr
, "lk_1: killing lwp %ld, for pid: %d\n",
734 lwpid_of (lwp
), pid
);
736 /* If we're killing a running inferior, make sure it is stopped
737 first, as PTRACE_KILL will not work otherwise. */
739 send_sigstop (&lwp
->head
);
743 ptrace (PTRACE_KILL
, lwpid_of (lwp
), 0, 0);
745 /* Make sure it died. The loop is most likely unnecessary. */
746 lwpid
= linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
747 } while (lwpid
> 0 && WIFSTOPPED (wstat
));
750 thread_db_free (process
, 0);
753 linux_remove_process (process
);
758 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
760 struct thread_info
*thread
= (struct thread_info
*) entry
;
761 struct lwp_info
*lwp
= get_thread_lwp (thread
);
762 int pid
= * (int *) args
;
764 if (ptid_get_pid (entry
->id
) != pid
)
767 /* If we're detaching from a running inferior, make sure it is
768 stopped first, as PTRACE_DETACH will not work otherwise. */
771 int lwpid
= lwpid_of (lwp
);
773 stopping_threads
= 1;
774 send_sigstop (&lwp
->head
);
776 /* If this detects a new thread through a clone event, the new
777 thread is appended to the end of the lwp list, so we'll
778 eventually detach from it. */
779 wait_for_sigstop (&lwp
->head
);
780 stopping_threads
= 0;
782 /* If LWP exits while we're trying to stop it, there's nothing
784 lwp
= find_lwp_pid (pid_to_ptid (lwpid
));
789 /* Make sure the process isn't stopped at a breakpoint that's
791 check_removed_breakpoint (lwp
);
793 /* If this process is stopped but is expecting a SIGSTOP, then make
794 sure we take care of that now. This isn't absolutely guaranteed
795 to collect the SIGSTOP, but is fairly likely to. */
796 if (lwp
->stop_expected
)
799 /* Clear stop_expected, so that the SIGSTOP will be reported. */
800 lwp
->stop_expected
= 0;
802 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
803 linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
806 /* Flush any pending changes to the process's registers. */
807 regcache_invalidate_one ((struct inferior_list_entry
*)
808 get_lwp_thread (lwp
));
810 /* Finally, let it resume. */
811 ptrace (PTRACE_DETACH
, lwpid_of (lwp
), 0, 0);
818 any_thread_of (struct inferior_list_entry
*entry
, void *args
)
822 if (ptid_get_pid (entry
->id
) == *pid_p
)
829 linux_detach (int pid
)
831 struct process_info
*process
;
833 process
= find_process_pid (pid
);
838 thread_db_free (process
, 1);
842 (struct thread_info
*) find_inferior (&all_threads
, any_thread_of
, &pid
);
844 delete_all_breakpoints ();
845 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
846 linux_remove_process (process
);
854 struct process_info
*process
;
856 process
= find_process_pid (pid
);
861 ret
= my_waitpid (pid
, &status
, 0);
862 if (WIFEXITED (status
) || WIFSIGNALED (status
))
864 } while (ret
!= -1 || errno
!= ECHILD
);
867 /* Return nonzero if the given thread is still alive. */
869 linux_thread_alive (ptid_t ptid
)
871 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
873 /* We assume we always know if a thread exits. If a whole process
874 exited but we still haven't been able to report it to GDB, we'll
875 hold on to the last lwp of the dead process. */
882 /* Return nonzero if this process stopped at a breakpoint which
883 no longer appears to be inserted. Also adjust the PC
884 appropriately to resume where the breakpoint used to be. */
886 check_removed_breakpoint (struct lwp_info
*event_child
)
889 struct thread_info
*saved_inferior
;
890 struct regcache
*regcache
;
892 if (event_child
->pending_is_breakpoint
== 0)
896 fprintf (stderr
, "Checking for breakpoint in lwp %ld.\n",
897 lwpid_of (event_child
));
899 saved_inferior
= current_inferior
;
900 current_inferior
= get_lwp_thread (event_child
);
901 regcache
= get_thread_regcache (current_inferior
, 1);
902 stop_pc
= get_stop_pc ();
904 /* If the PC has changed since we stopped, then we shouldn't do
905 anything. This happens if, for instance, GDB handled the
906 decr_pc_after_break subtraction itself. */
907 if (stop_pc
!= event_child
->pending_stop_pc
)
910 fprintf (stderr
, "Ignoring, PC was changed. Old PC was 0x%08llx\n",
911 event_child
->pending_stop_pc
);
913 event_child
->pending_is_breakpoint
= 0;
914 current_inferior
= saved_inferior
;
918 /* If the breakpoint is still there, we will report hitting it. */
919 if ((*the_low_target
.breakpoint_at
) (stop_pc
))
922 fprintf (stderr
, "Ignoring, breakpoint is still present.\n");
923 current_inferior
= saved_inferior
;
928 fprintf (stderr
, "Removed breakpoint.\n");
930 /* For decr_pc_after_break targets, here is where we perform the
931 decrement. We go immediately from this function to resuming,
932 and can not safely call get_stop_pc () again. */
933 if (the_low_target
.set_pc
!= NULL
)
936 fprintf (stderr
, "Set pc to 0x%lx\n", (long) stop_pc
);
937 (*the_low_target
.set_pc
) (regcache
, stop_pc
);
940 /* We consumed the pending SIGTRAP. */
941 event_child
->pending_is_breakpoint
= 0;
942 event_child
->status_pending_p
= 0;
943 event_child
->status_pending
= 0;
945 current_inferior
= saved_inferior
;
949 /* Return 1 if this lwp has an interesting status pending. This
950 function may silently resume an inferior lwp. */
952 status_pending_p (struct inferior_list_entry
*entry
, void *arg
)
954 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
955 ptid_t ptid
= * (ptid_t
*) arg
;
957 /* Check if we're only interested in events from a specific process
959 if (!ptid_equal (minus_one_ptid
, ptid
)
960 && ptid_get_pid (ptid
) != ptid_get_pid (lwp
->head
.id
))
963 if (lwp
->status_pending_p
&& !lwp
->suspended
)
964 if (check_removed_breakpoint (lwp
))
966 /* This thread was stopped at a breakpoint, and the breakpoint
967 is now gone. We were told to continue (or step...) all threads,
968 so GDB isn't trying to single-step past this breakpoint.
969 So instead of reporting the old SIGTRAP, pretend we got to
970 the breakpoint just after it was removed instead of just
971 before; resume the process. */
972 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
976 return (lwp
->status_pending_p
&& !lwp
->suspended
);
980 same_lwp (struct inferior_list_entry
*entry
, void *data
)
982 ptid_t ptid
= *(ptid_t
*) data
;
985 if (ptid_get_lwp (ptid
) != 0)
986 lwp
= ptid_get_lwp (ptid
);
988 lwp
= ptid_get_pid (ptid
);
990 if (ptid_get_lwp (entry
->id
) == lwp
)
997 find_lwp_pid (ptid_t ptid
)
999 return (struct lwp_info
*) find_inferior (&all_lwps
, same_lwp
, &ptid
);
1002 static struct lwp_info
*
1003 linux_wait_for_lwp (ptid_t ptid
, int *wstatp
, int options
)
1006 int to_wait_for
= -1;
1007 struct lwp_info
*child
= NULL
;
1010 fprintf (stderr
, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid
));
1012 if (ptid_equal (ptid
, minus_one_ptid
))
1013 to_wait_for
= -1; /* any child */
1015 to_wait_for
= ptid_get_lwp (ptid
); /* this lwp only */
1021 ret
= my_waitpid (to_wait_for
, wstatp
, options
);
1022 if (ret
== 0 || (ret
== -1 && errno
== ECHILD
&& (options
& WNOHANG
)))
1025 perror_with_name ("waitpid");
1028 && (!WIFSTOPPED (*wstatp
)
1029 || (WSTOPSIG (*wstatp
) != 32
1030 && WSTOPSIG (*wstatp
) != 33)))
1031 fprintf (stderr
, "Got an event from %d (%x)\n", ret
, *wstatp
);
1033 child
= find_lwp_pid (pid_to_ptid (ret
));
1035 /* If we didn't find a process, one of two things presumably happened:
1036 - A process we started and then detached from has exited. Ignore it.
1037 - A process we are controlling has forked and the new child's stop
1038 was reported to us by the kernel. Save its PID. */
1039 if (child
== NULL
&& WIFSTOPPED (*wstatp
))
1041 add_pid_to_list (&stopped_pids
, ret
);
1044 else if (child
== NULL
)
1048 child
->pending_is_breakpoint
= 0;
1050 child
->last_status
= *wstatp
;
1052 /* Architecture-specific setup after inferior is running.
1053 This needs to happen after we have attached to the inferior
1054 and it is stopped for the first time, but before we access
1055 any inferior registers. */
1058 the_low_target
.arch_setup ();
1059 #ifdef HAVE_LINUX_REGSETS
1060 memset (disabled_regsets
, 0, num_regsets
);
1066 && WIFSTOPPED (*wstatp
)
1067 && the_low_target
.get_pc
!= NULL
)
1069 struct thread_info
*saved_inferior
= current_inferior
;
1070 struct regcache
*regcache
;
1073 current_inferior
= (struct thread_info
*)
1074 find_inferior_id (&all_threads
, child
->head
.id
);
1075 regcache
= get_thread_regcache (current_inferior
, 1);
1076 pc
= (*the_low_target
.get_pc
) (regcache
);
1077 fprintf (stderr
, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc
);
1078 current_inferior
= saved_inferior
;
1084 /* Wait for an event from child PID. If PID is -1, wait for any
1085 child. Store the stop status through the status pointer WSTAT.
1086 OPTIONS is passed to the waitpid call. Return 0 if no child stop
1087 event was found and OPTIONS contains WNOHANG. Return the PID of
1088 the stopped child otherwise. */
1091 linux_wait_for_event_1 (ptid_t ptid
, int *wstat
, int options
)
1094 struct lwp_info
*event_child
= NULL
;
1096 struct lwp_info
*requested_child
= NULL
;
1098 /* Check for a lwp with a pending status. */
1099 /* It is possible that the user changed the pending task's registers since
1100 it stopped. We correctly handle the change of PC if we hit a breakpoint
1101 (in check_removed_breakpoint); signals should be reported anyway. */
1103 if (ptid_equal (ptid
, minus_one_ptid
)
1104 || ptid_equal (pid_to_ptid (ptid_get_pid (ptid
)), ptid
))
1106 event_child
= (struct lwp_info
*)
1107 find_inferior (&all_lwps
, status_pending_p
, &ptid
);
1108 if (debug_threads
&& event_child
)
1109 fprintf (stderr
, "Got a pending child %ld\n", lwpid_of (event_child
));
1113 requested_child
= find_lwp_pid (ptid
);
1114 if (requested_child
->status_pending_p
1115 && !check_removed_breakpoint (requested_child
))
1116 event_child
= requested_child
;
1119 if (event_child
!= NULL
)
1122 fprintf (stderr
, "Got an event from pending child %ld (%04x)\n",
1123 lwpid_of (event_child
), event_child
->status_pending
);
1124 *wstat
= event_child
->status_pending
;
1125 event_child
->status_pending_p
= 0;
1126 event_child
->status_pending
= 0;
1127 current_inferior
= get_lwp_thread (event_child
);
1128 return lwpid_of (event_child
);
1131 /* We only enter this loop if no process has a pending wait status. Thus
1132 any action taken in response to a wait status inside this loop is
1133 responding as soon as we detect the status, not after any pending
1137 event_child
= linux_wait_for_lwp (ptid
, wstat
, options
);
1139 if ((options
& WNOHANG
) && event_child
== NULL
)
1142 if (event_child
== NULL
)
1143 error ("event from unknown child");
1145 current_inferior
= get_lwp_thread (event_child
);
1147 /* Check for thread exit. */
1148 if (! WIFSTOPPED (*wstat
))
1151 fprintf (stderr
, "LWP %ld exiting\n", lwpid_of (event_child
));
1153 /* If the last thread is exiting, just return. */
1154 if (last_thread_of_process_p (current_inferior
))
1157 fprintf (stderr
, "LWP %ld is last lwp of process\n",
1158 lwpid_of (event_child
));
1159 return lwpid_of (event_child
);
1162 delete_lwp (event_child
);
1166 current_inferior
= (struct thread_info
*) all_threads
.head
;
1168 fprintf (stderr
, "Current inferior is now %ld\n",
1169 lwpid_of (get_thread_lwp (current_inferior
)));
1173 current_inferior
= NULL
;
1175 fprintf (stderr
, "Current inferior is now <NULL>\n");
1178 /* If we were waiting for this particular child to do something...
1179 well, it did something. */
1180 if (requested_child
!= NULL
)
1181 return lwpid_of (event_child
);
1183 /* Wait for a more interesting event. */
1187 if (event_child
->must_set_ptrace_flags
)
1189 ptrace (PTRACE_SETOPTIONS
, lwpid_of (event_child
),
1190 0, (PTRACE_ARG4_TYPE
) PTRACE_O_TRACECLONE
);
1191 event_child
->must_set_ptrace_flags
= 0;
1194 if (WIFSTOPPED (*wstat
)
1195 && WSTOPSIG (*wstat
) == SIGSTOP
1196 && event_child
->stop_expected
)
1199 fprintf (stderr
, "Expected stop.\n");
1200 event_child
->stop_expected
= 0;
1201 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
1205 if (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) == SIGTRAP
1206 && *wstat
>> 16 != 0)
1208 handle_extended_wait (event_child
, *wstat
);
1212 /* If GDB is not interested in this signal, don't stop other
1213 threads, and don't report it to GDB. Just resume the
1214 inferior right away. We do this for threading-related
1215 signals as well as any that GDB specifically requested we
1216 ignore. But never ignore SIGSTOP if we sent it ourselves,
1217 and do not ignore signals when stepping - they may require
1218 special handling to skip the signal handler. */
1219 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
1221 if (WIFSTOPPED (*wstat
)
1222 && !event_child
->stepping
1224 #if defined (USE_THREAD_DB) && defined (__SIGRTMIN)
1225 (current_process ()->private->thread_db
!= NULL
1226 && (WSTOPSIG (*wstat
) == __SIGRTMIN
1227 || WSTOPSIG (*wstat
) == __SIGRTMIN
+ 1))
1230 (pass_signals
[target_signal_from_host (WSTOPSIG (*wstat
))]
1231 && (WSTOPSIG (*wstat
) != SIGSTOP
|| !stopping_threads
))))
1233 siginfo_t info
, *info_p
;
1236 fprintf (stderr
, "Ignored signal %d for LWP %ld.\n",
1237 WSTOPSIG (*wstat
), lwpid_of (event_child
));
1239 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (event_child
), 0, &info
) == 0)
1243 linux_resume_one_lwp (event_child
,
1244 event_child
->stepping
,
1245 WSTOPSIG (*wstat
), info_p
);
1249 /* If this event was not handled above, and is not a SIGTRAP,
1250 report it. SIGILL and SIGSEGV are also treated as traps in case
1251 a breakpoint is inserted at the current PC. */
1252 if (!WIFSTOPPED (*wstat
)
1253 || (WSTOPSIG (*wstat
) != SIGTRAP
&& WSTOPSIG (*wstat
) != SIGILL
1254 && WSTOPSIG (*wstat
) != SIGSEGV
))
1255 return lwpid_of (event_child
);
1257 /* If this target does not support breakpoints, we simply report the
1258 signal; it's of no concern to us. */
1259 if (the_low_target
.get_pc
== NULL
)
1260 return lwpid_of (event_child
);
1262 stop_pc
= get_stop_pc ();
1264 /* Only handle SIGILL or SIGSEGV if we've hit a recognized
1266 if (WSTOPSIG (*wstat
) != SIGTRAP
1267 && (event_child
->stepping
1268 || ! (*the_low_target
.breakpoint_at
) (stop_pc
)))
1269 return lwpid_of (event_child
);
1271 /* bp_reinsert will only be set if we were single-stepping.
1272 Notice that we will resume the process after hitting
1273 a gdbserver breakpoint; single-stepping to/over one
1274 is not supported (yet). */
1275 if (event_child
->bp_reinsert
!= 0)
1278 fprintf (stderr
, "Reinserted breakpoint.\n");
1279 reinsert_breakpoint (event_child
->bp_reinsert
);
1280 event_child
->bp_reinsert
= 0;
1282 /* Clear the single-stepping flag and SIGTRAP as we resume. */
1283 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
1287 bp_status
= check_breakpoints (stop_pc
);
1292 fprintf (stderr
, "Hit a gdbserver breakpoint.\n");
1294 /* We hit one of our own breakpoints. We mark it as a pending
1295 breakpoint, so that check_removed_breakpoint () will do the PC
1296 adjustment for us at the appropriate time. */
1297 event_child
->pending_is_breakpoint
= 1;
1298 event_child
->pending_stop_pc
= stop_pc
;
1300 /* We may need to put the breakpoint back. We continue in the event
1301 loop instead of simply replacing the breakpoint right away,
1302 in order to not lose signals sent to the thread that hit the
1303 breakpoint. Unfortunately this increases the window where another
1304 thread could sneak past the removed breakpoint. For the current
1305 use of server-side breakpoints (thread creation) this is
1306 acceptable; but it needs to be considered before this breakpoint
1307 mechanism can be used in more general ways. For some breakpoints
1308 it may be necessary to stop all other threads, but that should
1309 be avoided where possible.
1311 If breakpoint_reinsert_addr is NULL, that means that we can
1312 use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint,
1313 mark it for reinsertion, and single-step.
1315 Otherwise, call the target function to figure out where we need
1316 our temporary breakpoint, create it, and continue executing this
1319 /* NOTE: we're lifting breakpoints in non-stop mode. This
1320 is currently only used for thread event breakpoints, so
1321 it isn't that bad as long as we have PTRACE_EVENT_CLONE
1324 /* No need to reinsert. */
1325 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
1326 else if (the_low_target
.breakpoint_reinsert_addr
== NULL
)
1328 event_child
->bp_reinsert
= stop_pc
;
1329 uninsert_breakpoint (stop_pc
);
1330 linux_resume_one_lwp (event_child
, 1, 0, NULL
);
1334 reinsert_breakpoint_by_bp
1335 (stop_pc
, (*the_low_target
.breakpoint_reinsert_addr
) ());
1336 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
1343 fprintf (stderr
, "Hit a non-gdbserver breakpoint.\n");
1345 /* If we were single-stepping, we definitely want to report the
1346 SIGTRAP. Although the single-step operation has completed,
1347 do not clear clear the stepping flag yet; we need to check it
1348 in wait_for_sigstop. */
1349 if (event_child
->stepping
)
1350 return lwpid_of (event_child
);
1352 /* A SIGTRAP that we can't explain. It may have been a breakpoint.
1353 Check if it is a breakpoint, and if so mark the process information
1354 accordingly. This will handle both the necessary fiddling with the
1355 PC on decr_pc_after_break targets and suppressing extra threads
1356 hitting a breakpoint if two hit it at once and then GDB removes it
1357 after the first is reported. Arguably it would be better to report
1358 multiple threads hitting breakpoints simultaneously, but the current
1359 remote protocol does not allow this. */
1360 if ((*the_low_target
.breakpoint_at
) (stop_pc
))
1362 event_child
->pending_is_breakpoint
= 1;
1363 event_child
->pending_stop_pc
= stop_pc
;
1366 return lwpid_of (event_child
);
1374 linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
)
1378 if (ptid_is_pid (ptid
))
1380 /* A request to wait for a specific tgid. This is not possible
1381 with waitpid, so instead, we wait for any child, and leave
1382 children we're not interested in right now with a pending
1383 status to report later. */
1384 wait_ptid
= minus_one_ptid
;
1393 event_pid
= linux_wait_for_event_1 (wait_ptid
, wstat
, options
);
1396 && ptid_is_pid (ptid
) && ptid_get_pid (ptid
) != event_pid
)
1398 struct lwp_info
*event_child
= find_lwp_pid (pid_to_ptid (event_pid
));
1400 if (! WIFSTOPPED (*wstat
))
1401 mark_lwp_dead (event_child
, *wstat
);
1404 event_child
->status_pending_p
= 1;
1405 event_child
->status_pending
= *wstat
;
1413 /* Wait for process, returns status. */
1416 linux_wait_1 (ptid_t ptid
,
1417 struct target_waitstatus
*ourstatus
, int target_options
)
1420 struct thread_info
*thread
= NULL
;
1421 struct lwp_info
*lwp
= NULL
;
1425 /* Translate generic target options into linux options. */
1427 if (target_options
& TARGET_WNOHANG
)
1431 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
1433 /* If we were only supposed to resume one thread, only wait for
1434 that thread - if it's still alive. If it died, however - which
1435 can happen if we're coming from the thread death case below -
1436 then we need to make sure we restart the other threads. We could
1437 pick a thread at random or restart all; restarting all is less
1440 && !ptid_equal (cont_thread
, null_ptid
)
1441 && !ptid_equal (cont_thread
, minus_one_ptid
))
1443 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
1446 /* No stepping, no signal - unless one is pending already, of course. */
1449 struct thread_resume resume_info
;
1450 resume_info
.thread
= minus_one_ptid
;
1451 resume_info
.kind
= resume_continue
;
1452 resume_info
.sig
= 0;
1453 linux_resume (&resume_info
, 1);
1459 pid
= linux_wait_for_event (ptid
, &w
, options
);
1460 if (pid
== 0) /* only if TARGET_WNOHANG */
1463 lwp
= get_thread_lwp (current_inferior
);
1465 /* If we are waiting for a particular child, and it exited,
1466 linux_wait_for_event will return its exit status. Similarly if
1467 the last child exited. If this is not the last child, however,
1468 do not report it as exited until there is a 'thread exited' response
1469 available in the remote protocol. Instead, just wait for another event.
1470 This should be safe, because if the thread crashed we will already
1471 have reported the termination signal to GDB; that should stop any
1472 in-progress stepping operations, etc.
1474 Report the exit status of the last thread to exit. This matches
1475 LinuxThreads' behavior. */
1477 if (last_thread_of_process_p (current_inferior
))
1479 if (WIFEXITED (w
) || WIFSIGNALED (w
))
1481 int pid
= pid_of (lwp
);
1482 struct process_info
*process
= find_process_pid (pid
);
1484 #ifdef USE_THREAD_DB
1485 thread_db_free (process
, 0);
1488 linux_remove_process (process
);
1490 current_inferior
= NULL
;
1494 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
1495 ourstatus
->value
.integer
= WEXITSTATUS (w
);
1498 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
1502 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
1503 ourstatus
->value
.sig
= target_signal_from_host (WTERMSIG (w
));
1506 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
1510 return pid_to_ptid (pid
);
1515 if (!WIFSTOPPED (w
))
1519 /* In all-stop, stop all threads. Be careful to only do this if
1520 we're about to report an event to GDB. */
1524 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
1526 if (lwp
->suspended
&& WSTOPSIG (w
) == SIGSTOP
)
1528 /* A thread that has been requested to stop by GDB with vCont;t,
1529 and it stopped cleanly, so report as SIG0. The use of
1530 SIGSTOP is an implementation detail. */
1531 ourstatus
->value
.sig
= TARGET_SIGNAL_0
;
1533 else if (lwp
->suspended
&& WSTOPSIG (w
) != SIGSTOP
)
1535 /* A thread that has been requested to stop by GDB with vCont;t,
1536 but, it stopped for other reasons. Set stop_expected so the
1537 pending SIGSTOP is ignored and the LWP is resumed. */
1538 lwp
->stop_expected
= 1;
1539 ourstatus
->value
.sig
= target_signal_from_host (WSTOPSIG (w
));
1543 ourstatus
->value
.sig
= target_signal_from_host (WSTOPSIG (w
));
1547 fprintf (stderr
, "linux_wait ret = %s, %d, %d\n",
1548 target_pid_to_str (lwp
->head
.id
),
1550 ourstatus
->value
.sig
);
1552 return lwp
->head
.id
;
1555 /* Get rid of any pending event in the pipe. */
1557 async_file_flush (void)
1563 ret
= read (linux_event_pipe
[0], &buf
, 1);
1564 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
1567 /* Put something in the pipe, so the event loop wakes up. */
1569 async_file_mark (void)
1573 async_file_flush ();
1576 ret
= write (linux_event_pipe
[1], "+", 1);
1577 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
1579 /* Ignore EAGAIN. If the pipe is full, the event loop will already
1580 be awakened anyway. */
1584 linux_wait (ptid_t ptid
,
1585 struct target_waitstatus
*ourstatus
, int target_options
)
1590 fprintf (stderr
, "linux_wait: [%s]\n", target_pid_to_str (ptid
));
1592 /* Flush the async file first. */
1593 if (target_is_async_p ())
1594 async_file_flush ();
1596 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
1598 /* If at least one stop was reported, there may be more. A single
1599 SIGCHLD can signal more than one child stop. */
1600 if (target_is_async_p ()
1601 && (target_options
& TARGET_WNOHANG
) != 0
1602 && !ptid_equal (event_ptid
, null_ptid
))
1608 /* Send a signal to an LWP. */
1611 kill_lwp (unsigned long lwpid
, int signo
)
1613 /* Use tkill, if possible, in case we are using nptl threads. If tkill
1614 fails, then we are not using nptl threads and we should be using kill. */
1618 static int tkill_failed
;
1625 ret
= syscall (__NR_tkill
, lwpid
, signo
);
1626 if (errno
!= ENOSYS
)
1633 return kill (lwpid
, signo
);
1637 send_sigstop (struct inferior_list_entry
*entry
)
1639 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1645 pid
= lwpid_of (lwp
);
1647 /* If we already have a pending stop signal for this process, don't
1649 if (lwp
->stop_expected
)
1652 fprintf (stderr
, "Have pending sigstop for lwp %d\n", pid
);
1654 /* We clear the stop_expected flag so that wait_for_sigstop
1655 will receive the SIGSTOP event (instead of silently resuming and
1656 waiting again). It'll be reset below. */
1657 lwp
->stop_expected
= 0;
1662 fprintf (stderr
, "Sending sigstop to lwp %d\n", pid
);
1664 kill_lwp (pid
, SIGSTOP
);
1668 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
1670 /* It's dead, really. */
1673 /* Store the exit status for later. */
1674 lwp
->status_pending_p
= 1;
1675 lwp
->status_pending
= wstat
;
1677 /* So that check_removed_breakpoint doesn't try to figure out if
1678 this is stopped at a breakpoint. */
1679 lwp
->pending_is_breakpoint
= 0;
1681 /* Prevent trying to stop it. */
1684 /* No further stops are expected from a dead lwp. */
1685 lwp
->stop_expected
= 0;
1689 wait_for_sigstop (struct inferior_list_entry
*entry
)
1691 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1692 struct thread_info
*saved_inferior
;
1700 saved_inferior
= current_inferior
;
1701 if (saved_inferior
!= NULL
)
1702 saved_tid
= ((struct inferior_list_entry
*) saved_inferior
)->id
;
1704 saved_tid
= null_ptid
; /* avoid bogus unused warning */
1706 ptid
= lwp
->head
.id
;
1708 linux_wait_for_event (ptid
, &wstat
, __WALL
);
1710 /* If we stopped with a non-SIGSTOP signal, save it for later
1711 and record the pending SIGSTOP. If the process exited, just
1713 if (WIFSTOPPED (wstat
)
1714 && WSTOPSIG (wstat
) != SIGSTOP
)
1717 fprintf (stderr
, "LWP %ld stopped with non-sigstop status %06x\n",
1718 lwpid_of (lwp
), wstat
);
1720 /* Do not leave a pending single-step finish to be reported to
1721 the client. The client will give us a new action for this
1722 thread, possibly a continue request --- otherwise, the client
1723 would consider this pending SIGTRAP reported later a spurious
1725 if (WSTOPSIG (wstat
) == SIGTRAP
1727 && !linux_stopped_by_watchpoint ())
1730 fprintf (stderr
, " single-step SIGTRAP ignored\n");
1734 lwp
->status_pending_p
= 1;
1735 lwp
->status_pending
= wstat
;
1737 lwp
->stop_expected
= 1;
1739 else if (!WIFSTOPPED (wstat
))
1742 fprintf (stderr
, "Process %ld exited while stopping LWPs\n",
1745 /* Leave this status pending for the next time we're able to
1746 report it. In the mean time, we'll report this lwp as dead
1747 to GDB, so GDB doesn't try to read registers and memory from
1749 mark_lwp_dead (lwp
, wstat
);
1752 if (saved_inferior
== NULL
|| linux_thread_alive (saved_tid
))
1753 current_inferior
= saved_inferior
;
1757 fprintf (stderr
, "Previously current thread died.\n");
1761 /* We can't change the current inferior behind GDB's back,
1762 otherwise, a subsequent command may apply to the wrong
1764 current_inferior
= NULL
;
1768 /* Set a valid thread as current. */
1769 set_desired_inferior (0);
1775 stop_all_lwps (void)
1777 stopping_threads
= 1;
1778 for_each_inferior (&all_lwps
, send_sigstop
);
1779 for_each_inferior (&all_lwps
, wait_for_sigstop
);
1780 stopping_threads
= 0;
1783 /* Resume execution of the inferior process.
1784 If STEP is nonzero, single-step it.
1785 If SIGNAL is nonzero, give it that signal. */
1788 linux_resume_one_lwp (struct lwp_info
*lwp
,
1789 int step
, int signal
, siginfo_t
*info
)
1791 struct thread_info
*saved_inferior
;
1793 if (lwp
->stopped
== 0)
1796 /* If we have pending signals or status, and a new signal, enqueue the
1797 signal. Also enqueue the signal if we are waiting to reinsert a
1798 breakpoint; it will be picked up again below. */
1800 && (lwp
->status_pending_p
|| lwp
->pending_signals
!= NULL
1801 || lwp
->bp_reinsert
!= 0))
1803 struct pending_signals
*p_sig
;
1804 p_sig
= xmalloc (sizeof (*p_sig
));
1805 p_sig
->prev
= lwp
->pending_signals
;
1806 p_sig
->signal
= signal
;
1808 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1810 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
1811 lwp
->pending_signals
= p_sig
;
1814 if (lwp
->status_pending_p
&& !check_removed_breakpoint (lwp
))
1817 saved_inferior
= current_inferior
;
1818 current_inferior
= get_lwp_thread (lwp
);
1821 fprintf (stderr
, "Resuming lwp %ld (%s, signal %d, stop %s)\n",
1822 lwpid_of (lwp
), step
? "step" : "continue", signal
,
1823 lwp
->stop_expected
? "expected" : "not expected");
1825 /* This bit needs some thinking about. If we get a signal that
1826 we must report while a single-step reinsert is still pending,
1827 we often end up resuming the thread. It might be better to
1828 (ew) allow a stack of pending events; then we could be sure that
1829 the reinsert happened right away and not lose any signals.
1831 Making this stack would also shrink the window in which breakpoints are
1832 uninserted (see comment in linux_wait_for_lwp) but not enough for
1833 complete correctness, so it won't solve that problem. It may be
1834 worthwhile just to solve this one, however. */
1835 if (lwp
->bp_reinsert
!= 0)
1838 fprintf (stderr
, " pending reinsert at %08lx", (long)lwp
->bp_reinsert
);
1840 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
1843 /* Postpone any pending signal. It was enqueued above. */
1847 check_removed_breakpoint (lwp
);
1849 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
1851 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
1852 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
1853 fprintf (stderr
, " resuming from pc 0x%lx\n", (long) pc
);
1856 /* If we have pending signals, consume one unless we are trying to reinsert
1858 if (lwp
->pending_signals
!= NULL
&& lwp
->bp_reinsert
== 0)
1860 struct pending_signals
**p_sig
;
1862 p_sig
= &lwp
->pending_signals
;
1863 while ((*p_sig
)->prev
!= NULL
)
1864 p_sig
= &(*p_sig
)->prev
;
1866 signal
= (*p_sig
)->signal
;
1867 if ((*p_sig
)->info
.si_signo
!= 0)
1868 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), 0, &(*p_sig
)->info
);
1874 if (the_low_target
.prepare_to_resume
!= NULL
)
1875 the_low_target
.prepare_to_resume (lwp
);
1877 regcache_invalidate_one ((struct inferior_list_entry
*)
1878 get_lwp_thread (lwp
));
1881 lwp
->stepping
= step
;
1882 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (lwp
), 0,
1883 /* Coerce to a uintptr_t first to avoid potential gcc warning
1884 of coercing an 8 byte integer to a 4 byte pointer. */
1885 (PTRACE_ARG4_TYPE
) (uintptr_t) signal
);
1887 current_inferior
= saved_inferior
;
1890 /* ESRCH from ptrace either means that the thread was already
1891 running (an error) or that it is gone (a race condition). If
1892 it's gone, we will get a notification the next time we wait,
1893 so we can ignore the error. We could differentiate these
1894 two, but it's tricky without waiting; the thread still exists
1895 as a zombie, so sending it signal 0 would succeed. So just
1900 perror_with_name ("ptrace");
1904 struct thread_resume_array
1906 struct thread_resume
*resume
;
1910 /* This function is called once per thread. We look up the thread
1911 in RESUME_PTR, and mark the thread with a pointer to the appropriate
1914 This algorithm is O(threads * resume elements), but resume elements
1915 is small (and will remain small at least until GDB supports thread
1918 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
1920 struct lwp_info
*lwp
;
1921 struct thread_info
*thread
;
1923 struct thread_resume_array
*r
;
1925 thread
= (struct thread_info
*) entry
;
1926 lwp
= get_thread_lwp (thread
);
1929 for (ndx
= 0; ndx
< r
->n
; ndx
++)
1931 ptid_t ptid
= r
->resume
[ndx
].thread
;
1932 if (ptid_equal (ptid
, minus_one_ptid
)
1933 || ptid_equal (ptid
, entry
->id
)
1934 || (ptid_is_pid (ptid
)
1935 && (ptid_get_pid (ptid
) == pid_of (lwp
)))
1936 || (ptid_get_lwp (ptid
) == -1
1937 && (ptid_get_pid (ptid
) == pid_of (lwp
))))
1939 lwp
->resume
= &r
->resume
[ndx
];
1944 /* No resume action for this thread. */
1951 /* Set *FLAG_P if this lwp has an interesting status pending. */
1953 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
1955 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1957 /* LWPs which will not be resumed are not interesting, because
1958 we might not wait for them next time through linux_wait. */
1959 if (lwp
->resume
== NULL
)
1962 /* If this thread has a removed breakpoint, we won't have any
1963 events to report later, so check now. check_removed_breakpoint
1964 may clear status_pending_p. We avoid calling check_removed_breakpoint
1965 for any thread that we are not otherwise going to resume - this
1966 lets us preserve stopped status when two threads hit a breakpoint.
1967 GDB removes the breakpoint to single-step a particular thread
1968 past it, then re-inserts it and resumes all threads. We want
1969 to report the second thread without resuming it in the interim. */
1970 if (lwp
->status_pending_p
)
1971 check_removed_breakpoint (lwp
);
1973 if (lwp
->status_pending_p
)
1974 * (int *) flag_p
= 1;
1979 /* This function is called once per thread. We check the thread's resume
1980 request, which will tell us whether to resume, step, or leave the thread
1981 stopped; and what signal, if any, it should be sent.
1983 For threads which we aren't explicitly told otherwise, we preserve
1984 the stepping flag; this is used for stepping over gdbserver-placed
1987 If pending_flags was set in any thread, we queue any needed
1988 signals, since we won't actually resume. We already have a pending
1989 event to report, so we don't need to preserve any step requests;
1990 they should be re-issued if necessary. */
1993 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
1995 struct lwp_info
*lwp
;
1996 struct thread_info
*thread
;
1998 int pending_flag
= * (int *) arg
;
2000 thread
= (struct thread_info
*) entry
;
2001 lwp
= get_thread_lwp (thread
);
2003 if (lwp
->resume
== NULL
)
2006 if (lwp
->resume
->kind
== resume_stop
)
2009 fprintf (stderr
, "suspending LWP %ld\n", lwpid_of (lwp
));
2014 fprintf (stderr
, "running -> suspending LWP %ld\n", lwpid_of (lwp
));
2017 send_sigstop (&lwp
->head
);
2024 fprintf (stderr
, "already stopped/suspended LWP %ld\n",
2027 fprintf (stderr
, "already stopped/not suspended LWP %ld\n",
2031 /* Make sure we leave the LWP suspended, so we don't try to
2032 resume it without GDB telling us to. FIXME: The LWP may
2033 have been stopped in an internal event that was not meant
2034 to be notified back to GDB (e.g., gdbserver breakpoint),
2035 so we should be reporting a stop event in that case
2040 /* For stop requests, we're done. */
2047 /* If this thread which is about to be resumed has a pending status,
2048 then don't resume any threads - we can just report the pending
2049 status. Make sure to queue any signals that would otherwise be
2050 sent. In all-stop mode, we do this decision based on if *any*
2051 thread has a pending status. */
2053 resume_status_pending_p (&lwp
->head
, &pending_flag
);
2058 fprintf (stderr
, "resuming LWP %ld\n", lwpid_of (lwp
));
2060 if (ptid_equal (lwp
->resume
->thread
, minus_one_ptid
)
2062 && lwp
->pending_is_breakpoint
)
2065 step
= (lwp
->resume
->kind
== resume_step
);
2067 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
2072 fprintf (stderr
, "leaving LWP %ld stopped\n", lwpid_of (lwp
));
2074 /* If we have a new signal, enqueue the signal. */
2075 if (lwp
->resume
->sig
!= 0)
2077 struct pending_signals
*p_sig
;
2078 p_sig
= xmalloc (sizeof (*p_sig
));
2079 p_sig
->prev
= lwp
->pending_signals
;
2080 p_sig
->signal
= lwp
->resume
->sig
;
2081 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
2083 /* If this is the same signal we were previously stopped by,
2084 make sure to queue its siginfo. We can ignore the return
2085 value of ptrace; if it fails, we'll skip
2086 PTRACE_SETSIGINFO. */
2087 if (WIFSTOPPED (lwp
->last_status
)
2088 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
2089 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), 0, &p_sig
->info
);
2091 lwp
->pending_signals
= p_sig
;
2100 linux_resume (struct thread_resume
*resume_info
, size_t n
)
2103 struct thread_resume_array array
= { resume_info
, n
};
2105 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
2107 /* If there is a thread which would otherwise be resumed, which
2108 has a pending status, then don't resume any threads - we can just
2109 report the pending status. Make sure to queue any signals
2110 that would otherwise be sent. In non-stop mode, we'll apply this
2111 logic to each thread individually. */
2114 find_inferior (&all_lwps
, resume_status_pending_p
, &pending_flag
);
2119 fprintf (stderr
, "Not resuming, pending status\n");
2121 fprintf (stderr
, "Resuming, no pending status\n");
2124 find_inferior (&all_threads
, linux_resume_one_thread
, &pending_flag
);
2127 #ifdef HAVE_LINUX_USRREGS
2130 register_addr (int regnum
)
2134 if (regnum
< 0 || regnum
>= the_low_target
.num_regs
)
2135 error ("Invalid register number %d.", regnum
);
2137 addr
= the_low_target
.regmap
[regnum
];
2142 /* Fetch one register. */
2144 fetch_register (struct regcache
*regcache
, int regno
)
2151 if (regno
>= the_low_target
.num_regs
)
2153 if ((*the_low_target
.cannot_fetch_register
) (regno
))
2156 regaddr
= register_addr (regno
);
2160 pid
= lwpid_of (get_thread_lwp (current_inferior
));
2161 size
= ((register_size (regno
) + sizeof (PTRACE_XFER_TYPE
) - 1)
2162 & - sizeof (PTRACE_XFER_TYPE
));
2163 buf
= alloca (size
);
2164 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
2167 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
2168 ptrace (PTRACE_PEEKUSER
, pid
,
2169 /* Coerce to a uintptr_t first to avoid potential gcc warning
2170 of coercing an 8 byte integer to a 4 byte pointer. */
2171 (PTRACE_ARG3_TYPE
) (uintptr_t) regaddr
, 0);
2172 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
2175 /* Warning, not error, in case we are attached; sometimes the
2176 kernel doesn't let us at the registers. */
2177 char *err
= strerror (errno
);
2178 char *msg
= alloca (strlen (err
) + 128);
2179 sprintf (msg
, "reading register %d: %s", regno
, err
);
2185 if (the_low_target
.supply_ptrace_register
)
2186 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
2188 supply_register (regcache
, regno
, buf
);
2193 /* Fetch all registers, or just one, from the child process. */
2195 usr_fetch_inferior_registers (struct regcache
*regcache
, int regno
)
2198 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
2199 fetch_register (regcache
, regno
);
2201 fetch_register (regcache
, regno
);
2204 /* Store our register values back into the inferior.
2205 If REGNO is -1, do this for all registers.
2206 Otherwise, REGNO specifies which register (so we can save time). */
2208 usr_store_inferior_registers (struct regcache
*regcache
, int regno
)
2217 if (regno
>= the_low_target
.num_regs
)
2220 if ((*the_low_target
.cannot_store_register
) (regno
) == 1)
2223 regaddr
= register_addr (regno
);
2227 size
= (register_size (regno
) + sizeof (PTRACE_XFER_TYPE
) - 1)
2228 & - sizeof (PTRACE_XFER_TYPE
);
2229 buf
= alloca (size
);
2230 memset (buf
, 0, size
);
2232 if (the_low_target
.collect_ptrace_register
)
2233 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
2235 collect_register (regcache
, regno
, buf
);
2237 pid
= lwpid_of (get_thread_lwp (current_inferior
));
2238 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
2241 ptrace (PTRACE_POKEUSER
, pid
,
2242 /* Coerce to a uintptr_t first to avoid potential gcc warning
2243 about coercing an 8 byte integer to a 4 byte pointer. */
2244 (PTRACE_ARG3_TYPE
) (uintptr_t) regaddr
,
2245 (PTRACE_ARG4_TYPE
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
2248 /* At this point, ESRCH should mean the process is
2249 already gone, in which case we simply ignore attempts
2250 to change its registers. See also the related
2251 comment in linux_resume_one_lwp. */
2255 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
2257 char *err
= strerror (errno
);
2258 char *msg
= alloca (strlen (err
) + 128);
2259 sprintf (msg
, "writing register %d: %s",
2265 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
2269 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
2270 usr_store_inferior_registers (regcache
, regno
);
2272 #endif /* HAVE_LINUX_USRREGS */
2276 #ifdef HAVE_LINUX_REGSETS
2279 regsets_fetch_inferior_registers (struct regcache
*regcache
)
2281 struct regset_info
*regset
;
2282 int saw_general_regs
= 0;
2285 regset
= target_regsets
;
2287 pid
= lwpid_of (get_thread_lwp (current_inferior
));
2288 while (regset
->size
>= 0)
2293 if (regset
->size
== 0 || disabled_regsets
[regset
- target_regsets
])
2299 buf
= xmalloc (regset
->size
);
2301 res
= ptrace (regset
->get_request
, pid
, 0, buf
);
2303 res
= ptrace (regset
->get_request
, pid
, buf
, 0);
2309 /* If we get EIO on a regset, do not try it again for
2311 disabled_regsets
[regset
- target_regsets
] = 1;
2318 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
2323 else if (regset
->type
== GENERAL_REGS
)
2324 saw_general_regs
= 1;
2325 regset
->store_function (regcache
, buf
);
2329 if (saw_general_regs
)
2336 regsets_store_inferior_registers (struct regcache
*regcache
)
2338 struct regset_info
*regset
;
2339 int saw_general_regs
= 0;
2342 regset
= target_regsets
;
2344 pid
= lwpid_of (get_thread_lwp (current_inferior
));
2345 while (regset
->size
>= 0)
2350 if (regset
->size
== 0 || disabled_regsets
[regset
- target_regsets
])
2356 buf
= xmalloc (regset
->size
);
2358 /* First fill the buffer with the current register set contents,
2359 in case there are any items in the kernel's regset that are
2360 not in gdbserver's regcache. */
2362 res
= ptrace (regset
->get_request
, pid
, 0, buf
);
2364 res
= ptrace (regset
->get_request
, pid
, buf
, 0);
2369 /* Then overlay our cached registers on that. */
2370 regset
->fill_function (regcache
, buf
);
2372 /* Only now do we write the register set. */
2374 res
= ptrace (regset
->set_request
, pid
, 0, buf
);
2376 res
= ptrace (regset
->set_request
, pid
, buf
, 0);
2384 /* If we get EIO on a regset, do not try it again for
2386 disabled_regsets
[regset
- target_regsets
] = 1;
2390 else if (errno
== ESRCH
)
2392 /* At this point, ESRCH should mean the process is
2393 already gone, in which case we simply ignore attempts
2394 to change its registers. See also the related
2395 comment in linux_resume_one_lwp. */
2401 perror ("Warning: ptrace(regsets_store_inferior_registers)");
2404 else if (regset
->type
== GENERAL_REGS
)
2405 saw_general_regs
= 1;
2409 if (saw_general_regs
)
2416 #endif /* HAVE_LINUX_REGSETS */
2420 linux_fetch_registers (struct regcache
*regcache
, int regno
)
2422 #ifdef HAVE_LINUX_REGSETS
2423 if (regsets_fetch_inferior_registers (regcache
) == 0)
2426 #ifdef HAVE_LINUX_USRREGS
2427 usr_fetch_inferior_registers (regcache
, regno
);
2432 linux_store_registers (struct regcache
*regcache
, int regno
)
2434 #ifdef HAVE_LINUX_REGSETS
2435 if (regsets_store_inferior_registers (regcache
) == 0)
2438 #ifdef HAVE_LINUX_USRREGS
2439 usr_store_inferior_registers (regcache
, regno
);
2444 /* Copy LEN bytes from inferior's memory starting at MEMADDR
2445 to debugger memory starting at MYADDR. */
2448 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
2451 /* Round starting address down to longword boundary. */
2452 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
2453 /* Round ending address up; get number of longwords that makes. */
2455 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
2456 / sizeof (PTRACE_XFER_TYPE
);
2457 /* Allocate buffer of that many longwords. */
2458 register PTRACE_XFER_TYPE
*buffer
2459 = (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
2462 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
2464 /* Try using /proc. Don't bother for one word. */
2465 if (len
>= 3 * sizeof (long))
2467 /* We could keep this file open and cache it - possibly one per
2468 thread. That requires some juggling, but is even faster. */
2469 sprintf (filename
, "/proc/%d/mem", pid
);
2470 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
2474 /* If pread64 is available, use it. It's faster if the kernel
2475 supports it (only one syscall), and it's 64-bit safe even on
2476 32-bit platforms (for instance, SPARC debugging a SPARC64
2479 if (pread64 (fd
, myaddr
, len
, memaddr
) != len
)
2481 if (lseek (fd
, memaddr
, SEEK_SET
) == -1 || read (fd
, myaddr
, len
) != len
)
2493 /* Read all the longwords */
2494 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
2497 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
2498 about coercing an 8 byte integer to a 4 byte pointer. */
2499 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
2500 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
, 0);
2505 /* Copy appropriate bytes out of the buffer. */
2507 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
2513 /* Copy LEN bytes of data from debugger memory at MYADDR
2514 to inferior's memory at MEMADDR.
2515 On failure (cannot write the inferior)
2516 returns the value of errno. */
2519 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
2522 /* Round starting address down to longword boundary. */
2523 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
2524 /* Round ending address up; get number of longwords that makes. */
2526 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1) / sizeof (PTRACE_XFER_TYPE
);
2527 /* Allocate buffer of that many longwords. */
2528 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
2529 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
2533 /* Dump up to four bytes. */
2534 unsigned int val
= * (unsigned int *) myaddr
;
2540 val
= val
& 0xffffff;
2541 fprintf (stderr
, "Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
2542 val
, (long)memaddr
);
2545 /* Fill start and end extra bytes of buffer with existing memory data. */
2547 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
2548 about coercing an 8 byte integer to a 4 byte pointer. */
2549 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
2550 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
, 0);
2555 = ptrace (PTRACE_PEEKTEXT
, pid
,
2556 /* Coerce to a uintptr_t first to avoid potential gcc warning
2557 about coercing an 8 byte integer to a 4 byte pointer. */
2558 (PTRACE_ARG3_TYPE
) (uintptr_t) (addr
+ (count
- 1)
2559 * sizeof (PTRACE_XFER_TYPE
)),
2563 /* Copy data to be written over corresponding part of buffer */
2565 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)), myaddr
, len
);
2567 /* Write the entire buffer. */
2569 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
2572 ptrace (PTRACE_POKETEXT
, pid
,
2573 /* Coerce to a uintptr_t first to avoid potential gcc warning
2574 about coercing an 8 byte integer to a 4 byte pointer. */
2575 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
,
2576 (PTRACE_ARG4_TYPE
) buffer
[i
]);
2584 /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */
2585 static int linux_supports_tracefork_flag
;
2587 /* Helper functions for linux_test_for_tracefork, called via clone (). */
2590 linux_tracefork_grandchild (void *arg
)
2595 #define STACK_SIZE 4096
2598 linux_tracefork_child (void *arg
)
2600 ptrace (PTRACE_TRACEME
, 0, 0, 0);
2601 kill (getpid (), SIGSTOP
);
2603 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
2606 linux_tracefork_grandchild (NULL
);
2608 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2611 __clone2 (linux_tracefork_grandchild
, arg
, STACK_SIZE
,
2612 CLONE_VM
| SIGCHLD
, NULL
);
2614 clone (linux_tracefork_grandchild
, arg
+ STACK_SIZE
,
2615 CLONE_VM
| SIGCHLD
, NULL
);
2618 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2623 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make
2624 sure that we can enable the option, and that it had the desired
2628 linux_test_for_tracefork (void)
2630 int child_pid
, ret
, status
;
2632 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
2633 char *stack
= xmalloc (STACK_SIZE
* 4);
2634 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2636 linux_supports_tracefork_flag
= 0;
2638 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
2640 child_pid
= fork ();
2642 linux_tracefork_child (NULL
);
2644 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2646 /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */
2648 child_pid
= __clone2 (linux_tracefork_child
, stack
, STACK_SIZE
,
2649 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
2650 #else /* !__ia64__ */
2651 child_pid
= clone (linux_tracefork_child
, stack
+ STACK_SIZE
,
2652 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
2653 #endif /* !__ia64__ */
2655 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2657 if (child_pid
== -1)
2658 perror_with_name ("clone");
2660 ret
= my_waitpid (child_pid
, &status
, 0);
2662 perror_with_name ("waitpid");
2663 else if (ret
!= child_pid
)
2664 error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret
);
2665 if (! WIFSTOPPED (status
))
2666 error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status
);
2668 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0,
2669 (PTRACE_ARG4_TYPE
) PTRACE_O_TRACEFORK
);
2672 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
2675 warning ("linux_test_for_tracefork: failed to kill child");
2679 ret
= my_waitpid (child_pid
, &status
, 0);
2680 if (ret
!= child_pid
)
2681 warning ("linux_test_for_tracefork: failed to wait for killed child");
2682 else if (!WIFSIGNALED (status
))
2683 warning ("linux_test_for_tracefork: unexpected wait status 0x%x from "
2684 "killed child", status
);
2689 ret
= ptrace (PTRACE_CONT
, child_pid
, 0, 0);
2691 warning ("linux_test_for_tracefork: failed to resume child");
2693 ret
= my_waitpid (child_pid
, &status
, 0);
2695 if (ret
== child_pid
&& WIFSTOPPED (status
)
2696 && status
>> 16 == PTRACE_EVENT_FORK
)
2699 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, 0, &second_pid
);
2700 if (ret
== 0 && second_pid
!= 0)
2704 linux_supports_tracefork_flag
= 1;
2705 my_waitpid (second_pid
, &second_status
, 0);
2706 ret
= ptrace (PTRACE_KILL
, second_pid
, 0, 0);
2708 warning ("linux_test_for_tracefork: failed to kill second child");
2709 my_waitpid (second_pid
, &status
, 0);
2713 warning ("linux_test_for_tracefork: unexpected result from waitpid "
2714 "(%d, status 0x%x)", ret
, status
);
2718 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
2720 warning ("linux_test_for_tracefork: failed to kill child");
2721 my_waitpid (child_pid
, &status
, 0);
2723 while (WIFSTOPPED (status
));
2725 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
2727 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2732 linux_look_up_symbols (void)
2734 #ifdef USE_THREAD_DB
2735 struct process_info
*proc
= current_process ();
2737 if (proc
->private->thread_db
!= NULL
)
2740 /* If the kernel supports tracing forks then it also supports tracing
2741 clones, and then we don't need to use the magic thread event breakpoint
2742 to learn about threads. */
2743 thread_db_init (!linux_supports_tracefork_flag
);
2748 linux_request_interrupt (void)
2750 extern unsigned long signal_pid
;
2752 if (!ptid_equal (cont_thread
, null_ptid
)
2753 && !ptid_equal (cont_thread
, minus_one_ptid
))
2755 struct lwp_info
*lwp
;
2758 lwp
= get_thread_lwp (current_inferior
);
2759 lwpid
= lwpid_of (lwp
);
2760 kill_lwp (lwpid
, SIGINT
);
2763 kill_lwp (signal_pid
, SIGINT
);
2766 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
2767 to debugger memory starting at MYADDR. */
2770 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
2772 char filename
[PATH_MAX
];
2774 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
2776 snprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
2778 fd
= open (filename
, O_RDONLY
);
2782 if (offset
!= (CORE_ADDR
) 0
2783 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
2786 n
= read (fd
, myaddr
, len
);
2793 /* These breakpoint and watchpoint related wrapper functions simply
2794 pass on the function call if the target has registered a
2795 corresponding function. */
2798 linux_insert_point (char type
, CORE_ADDR addr
, int len
)
2800 if (the_low_target
.insert_point
!= NULL
)
2801 return the_low_target
.insert_point (type
, addr
, len
);
2803 /* Unsupported (see target.h). */
2808 linux_remove_point (char type
, CORE_ADDR addr
, int len
)
2810 if (the_low_target
.remove_point
!= NULL
)
2811 return the_low_target
.remove_point (type
, addr
, len
);
2813 /* Unsupported (see target.h). */
2818 linux_stopped_by_watchpoint (void)
2820 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2821 return the_low_target
.stopped_by_watchpoint ();
2827 linux_stopped_data_address (void)
2829 if (the_low_target
.stopped_data_address
!= NULL
)
2830 return the_low_target
.stopped_data_address ();
2835 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
2836 #if defined(__mcoldfire__)
2837 /* These should really be defined in the kernel's ptrace.h header. */
2838 #define PT_TEXT_ADDR 49*4
2839 #define PT_DATA_ADDR 50*4
2840 #define PT_TEXT_END_ADDR 51*4
2843 /* Under uClinux, programs are loaded at non-zero offsets, which we need
2844 to tell gdb about. */
2847 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
2849 #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR)
2850 unsigned long text
, text_end
, data
;
2851 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
2855 text
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_TEXT_ADDR
, 0);
2856 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_TEXT_END_ADDR
, 0);
2857 data
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_DATA_ADDR
, 0);
2861 /* Both text and data offsets produced at compile-time (and so
2862 used by gdb) are relative to the beginning of the program,
2863 with the data segment immediately following the text segment.
2864 However, the actual runtime layout in memory may put the data
2865 somewhere else, so when we send gdb a data base-address, we
2866 use the real data base address and subtract the compile-time
2867 data base-address from it (which is just the length of the
2868 text segment). BSS immediately follows data in both
2871 *data_p
= data
- (text_end
- text
);
2881 compare_ints (const void *xa
, const void *xb
)
2883 int a
= *(const int *)xa
;
2884 int b
= *(const int *)xb
;
2890 unique (int *b
, int *e
)
2899 /* Given PID, iterates over all threads in that process.
2901 Information about each thread, in a format suitable for qXfer:osdata:thread
2902 is printed to BUFFER, if it's not NULL. BUFFER is assumed to be already
2903 initialized, and the caller is responsible for finishing and appending '\0'
2906 The list of cores that threads are running on is assigned to *CORES, if it
2907 is not NULL. If no cores are found, *CORES will be set to NULL. Caller
2908 should free *CORES. */
2911 list_threads (int pid
, struct buffer
*buffer
, char **cores
)
2915 int *core_numbers
= xmalloc (sizeof (int) * allocated
);
2919 struct stat statbuf
;
2921 sprintf (pathname
, "/proc/%d/task", pid
);
2922 if (stat (pathname
, &statbuf
) == 0 && S_ISDIR (statbuf
.st_mode
))
2924 dir
= opendir (pathname
);
2927 free (core_numbers
);
2931 while ((dp
= readdir (dir
)) != NULL
)
2933 unsigned long lwp
= strtoul (dp
->d_name
, NULL
, 10);
2937 unsigned core
= linux_core_of_thread (ptid_build (pid
, lwp
, 0));
2941 char s
[sizeof ("4294967295")];
2942 sprintf (s
, "%u", core
);
2944 if (count
== allocated
)
2947 core_numbers
= realloc (core_numbers
,
2948 sizeof (int) * allocated
);
2950 core_numbers
[count
++] = core
;
2952 buffer_xml_printf (buffer
,
2954 "<column name=\"pid\">%d</column>"
2955 "<column name=\"tid\">%s</column>"
2956 "<column name=\"core\">%s</column>"
2957 "</item>", pid
, dp
->d_name
, s
);
2962 buffer_xml_printf (buffer
,
2964 "<column name=\"pid\">%d</column>"
2965 "<column name=\"tid\">%s</column>"
2966 "</item>", pid
, dp
->d_name
);
2977 struct buffer buffer2
;
2980 qsort (core_numbers
, count
, sizeof (int), compare_ints
);
2982 /* Remove duplicates. */
2984 e
= unique (b
, core_numbers
+ count
);
2986 buffer_init (&buffer2
);
2988 for (b
= core_numbers
; b
!= e
; ++b
)
2990 char number
[sizeof ("4294967295")];
2991 sprintf (number
, "%u", *b
);
2992 buffer_xml_printf (&buffer2
, "%s%s",
2993 (b
== core_numbers
) ? "" : ",", number
);
2995 buffer_grow_str0 (&buffer2
, "");
2997 *cores
= buffer_finish (&buffer2
);
3000 free (core_numbers
);
3004 show_process (int pid
, const char *username
, struct buffer
*buffer
)
3008 char cmd
[MAXPATHLEN
+ 1];
3010 sprintf (pathname
, "/proc/%d/cmdline", pid
);
3012 if ((f
= fopen (pathname
, "r")) != NULL
)
3014 size_t len
= fread (cmd
, 1, sizeof (cmd
) - 1, f
);
3019 for (i
= 0; i
< len
; i
++)
3024 buffer_xml_printf (buffer
,
3026 "<column name=\"pid\">%d</column>"
3027 "<column name=\"user\">%s</column>"
3028 "<column name=\"command\">%s</column>",
3033 /* This only collects core numbers, and does not print threads. */
3034 list_threads (pid
, NULL
, &cores
);
3038 buffer_xml_printf (buffer
,
3039 "<column name=\"cores\">%s</column>", cores
);
3043 buffer_xml_printf (buffer
, "</item>");
3050 linux_qxfer_osdata (const char *annex
,
3051 unsigned char *readbuf
, unsigned const char *writebuf
,
3052 CORE_ADDR offset
, int len
)
3054 /* We make the process list snapshot when the object starts to be
3056 static const char *buf
;
3057 static long len_avail
= -1;
3058 static struct buffer buffer
;
3064 if (strcmp (annex
, "processes") == 0)
3066 else if (strcmp (annex
, "threads") == 0)
3071 if (!readbuf
|| writebuf
)
3076 if (len_avail
!= -1 && len_avail
!= 0)
3077 buffer_free (&buffer
);
3080 buffer_init (&buffer
);
3082 buffer_grow_str (&buffer
, "<osdata type=\"processes\">");
3084 buffer_grow_str (&buffer
, "<osdata type=\"threads\">");
3086 dirp
= opendir ("/proc");
3090 while ((dp
= readdir (dirp
)) != NULL
)
3092 struct stat statbuf
;
3093 char procentry
[sizeof ("/proc/4294967295")];
3095 if (!isdigit (dp
->d_name
[0])
3096 || strlen (dp
->d_name
) > sizeof ("4294967295") - 1)
3099 sprintf (procentry
, "/proc/%s", dp
->d_name
);
3100 if (stat (procentry
, &statbuf
) == 0
3101 && S_ISDIR (statbuf
.st_mode
))
3103 int pid
= (int) strtoul (dp
->d_name
, NULL
, 10);
3107 struct passwd
*entry
= getpwuid (statbuf
.st_uid
);
3108 show_process (pid
, entry
? entry
->pw_name
: "?", &buffer
);
3112 list_threads (pid
, &buffer
, NULL
);
3119 buffer_grow_str0 (&buffer
, "</osdata>\n");
3120 buf
= buffer_finish (&buffer
);
3121 len_avail
= strlen (buf
);
3124 if (offset
>= len_avail
)
3126 /* Done. Get rid of the data. */
3127 buffer_free (&buffer
);
3133 if (len
> len_avail
- offset
)
3134 len
= len_avail
- offset
;
3135 memcpy (readbuf
, buf
+ offset
, len
);
3140 /* Convert a native/host siginfo object, into/from the siginfo in the
3141 layout of the inferiors' architecture. */
3144 siginfo_fixup (struct siginfo
*siginfo
, void *inf_siginfo
, int direction
)
3148 if (the_low_target
.siginfo_fixup
!= NULL
)
3149 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
3151 /* If there was no callback, or the callback didn't do anything,
3152 then just do a straight memcpy. */
3156 memcpy (siginfo
, inf_siginfo
, sizeof (struct siginfo
));
3158 memcpy (inf_siginfo
, siginfo
, sizeof (struct siginfo
));
3163 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
3164 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
3167 struct siginfo siginfo
;
3168 char inf_siginfo
[sizeof (struct siginfo
)];
3170 if (current_inferior
== NULL
)
3173 pid
= lwpid_of (get_thread_lwp (current_inferior
));
3176 fprintf (stderr
, "%s siginfo for lwp %d.\n",
3177 readbuf
!= NULL
? "Reading" : "Writing",
3180 if (offset
> sizeof (siginfo
))
3183 if (ptrace (PTRACE_GETSIGINFO
, pid
, 0, &siginfo
) != 0)
3186 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
3187 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
3188 inferior with a 64-bit GDBSERVER should look the same as debugging it
3189 with a 32-bit GDBSERVER, we need to convert it. */
3190 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
3192 if (offset
+ len
> sizeof (siginfo
))
3193 len
= sizeof (siginfo
) - offset
;
3195 if (readbuf
!= NULL
)
3196 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
3199 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
3201 /* Convert back to ptrace layout before flushing it out. */
3202 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
3204 if (ptrace (PTRACE_SETSIGINFO
, pid
, 0, &siginfo
) != 0)
3211 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
3212 so we notice when children change state; as the handler for the
3213 sigsuspend in my_waitpid. */
3216 sigchld_handler (int signo
)
3218 int old_errno
= errno
;
3221 /* fprintf is not async-signal-safe, so call write directly. */
3222 write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1);
3224 if (target_is_async_p ())
3225 async_file_mark (); /* trigger a linux_wait */
3231 linux_supports_non_stop (void)
3237 linux_async (int enable
)
3239 int previous
= (linux_event_pipe
[0] != -1);
3241 if (previous
!= enable
)
3244 sigemptyset (&mask
);
3245 sigaddset (&mask
, SIGCHLD
);
3247 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
3251 if (pipe (linux_event_pipe
) == -1)
3252 fatal ("creating event pipe failed.");
3254 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
3255 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
3257 /* Register the event loop handler. */
3258 add_file_handler (linux_event_pipe
[0],
3259 handle_target_event
, NULL
);
3261 /* Always trigger a linux_wait. */
3266 delete_file_handler (linux_event_pipe
[0]);
3268 close (linux_event_pipe
[0]);
3269 close (linux_event_pipe
[1]);
3270 linux_event_pipe
[0] = -1;
3271 linux_event_pipe
[1] = -1;
3274 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
3281 linux_start_non_stop (int nonstop
)
3283 /* Register or unregister from event-loop accordingly. */
3284 linux_async (nonstop
);
3289 linux_supports_multi_process (void)
3295 /* Enumerate spufs IDs for process PID. */
3297 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
3303 struct dirent
*entry
;
3305 sprintf (path
, "/proc/%ld/fd", pid
);
3306 dir
= opendir (path
);
3311 while ((entry
= readdir (dir
)) != NULL
)
3317 fd
= atoi (entry
->d_name
);
3321 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
3322 if (stat (path
, &st
) != 0)
3324 if (!S_ISDIR (st
.st_mode
))
3327 if (statfs (path
, &stfs
) != 0)
3329 if (stfs
.f_type
!= SPUFS_MAGIC
)
3332 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
3334 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
3344 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
3345 object type, using the /proc file system. */
3347 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
3348 unsigned const char *writebuf
,
3349 CORE_ADDR offset
, int len
)
3351 long pid
= lwpid_of (get_thread_lwp (current_inferior
));
3356 if (!writebuf
&& !readbuf
)
3364 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
3367 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
3368 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
3373 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
3380 ret
= write (fd
, writebuf
, (size_t) len
);
3382 ret
= read (fd
, readbuf
, (size_t) len
);
3389 linux_core_of_thread (ptid_t ptid
)
3391 char filename
[sizeof ("/proc//task//stat")
3392 + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */
3395 char *content
= NULL
;
3398 int content_read
= 0;
3402 sprintf (filename
, "/proc/%d/task/%ld/stat",
3403 ptid_get_pid (ptid
), ptid_get_lwp (ptid
));
3404 f
= fopen (filename
, "r");
3411 content
= realloc (content
, content_read
+ 1024);
3412 n
= fread (content
+ content_read
, 1, 1024, f
);
3416 content
[content_read
] = '\0';
3421 p
= strchr (content
, '(');
3422 p
= strchr (p
, ')') + 2; /* skip ")" and a whitespace. */
3424 p
= strtok_r (p
, " ", &ts
);
3425 for (i
= 0; i
!= 36; ++i
)
3426 p
= strtok_r (NULL
, " ", &ts
);
3428 if (sscanf (p
, "%d", &core
) == 0)
3437 static struct target_ops linux_target_ops
= {
3438 linux_create_inferior
,
3446 linux_fetch_registers
,
3447 linux_store_registers
,
3450 linux_look_up_symbols
,
3451 linux_request_interrupt
,
3455 linux_stopped_by_watchpoint
,
3456 linux_stopped_data_address
,
3457 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
3462 #ifdef USE_THREAD_DB
3463 thread_db_get_tls_address
,
3468 hostio_last_error_from_errno
,
3471 linux_supports_non_stop
,
3473 linux_start_non_stop
,
3474 linux_supports_multi_process
,
3475 #ifdef USE_THREAD_DB
3476 thread_db_handle_monitor_command
,
3480 linux_core_of_thread
3484 linux_init_signals ()
3486 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
3487 to find what the cancel signal actually is. */
3488 #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */
3489 signal (__SIGRTMIN
+1, SIG_IGN
);
3494 initialize_low (void)
3496 struct sigaction sigchld_action
;
3497 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
3498 set_target_ops (&linux_target_ops
);
3499 set_breakpoint_data (the_low_target
.breakpoint
,
3500 the_low_target
.breakpoint_len
);
3501 linux_init_signals ();
3502 linux_test_for_tracefork ();
3503 #ifdef HAVE_LINUX_REGSETS
3504 for (num_regsets
= 0; target_regsets
[num_regsets
].size
>= 0; num_regsets
++)
3506 disabled_regsets
= xmalloc (num_regsets
);
3509 sigchld_action
.sa_handler
= sigchld_handler
;
3510 sigemptyset (&sigchld_action
.sa_mask
);
3511 sigchld_action
.sa_flags
= SA_RESTART
;
3512 sigaction (SIGCHLD
, &sigchld_action
, NULL
);