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
);
1065 /* Fetch the possibly triggered data watchpoint info and store it in
1068 On some archs, like x86, that use debug registers to set
1069 watchpoints, it's possible that the way to know which watched
1070 address trapped, is to check the register that is used to select
1071 which address to watch. Problem is, between setting the
1072 watchpoint and reading back which data address trapped, the user
1073 may change the set of watchpoints, and, as a consequence, GDB
1074 changes the debug registers in the inferior. To avoid reading
1075 back a stale stopped-data-address when that happens, we cache in
1076 LP the fact that a watchpoint trapped, and the corresponding data
1077 address, as soon as we see CHILD stop with a SIGTRAP. If GDB
1078 changes the debug registers meanwhile, we have the cached data we
1081 if (WIFSTOPPED (*wstatp
) && WSTOPSIG (*wstatp
) == SIGTRAP
)
1083 if (the_low_target
.stopped_by_watchpoint
== NULL
)
1085 child
->stopped_by_watchpoint
= 0;
1089 struct thread_info
*saved_inferior
;
1091 saved_inferior
= current_inferior
;
1092 current_inferior
= get_lwp_thread (child
);
1094 child
->stopped_by_watchpoint
1095 = the_low_target
.stopped_by_watchpoint ();
1097 if (child
->stopped_by_watchpoint
)
1099 if (the_low_target
.stopped_data_address
!= NULL
)
1100 child
->stopped_data_address
1101 = the_low_target
.stopped_data_address ();
1103 child
->stopped_data_address
= 0;
1106 current_inferior
= saved_inferior
;
1111 && WIFSTOPPED (*wstatp
)
1112 && the_low_target
.get_pc
!= NULL
)
1114 struct thread_info
*saved_inferior
= current_inferior
;
1115 struct regcache
*regcache
;
1118 current_inferior
= (struct thread_info
*)
1119 find_inferior_id (&all_threads
, child
->head
.id
);
1120 regcache
= get_thread_regcache (current_inferior
, 1);
1121 pc
= (*the_low_target
.get_pc
) (regcache
);
1122 fprintf (stderr
, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc
);
1123 current_inferior
= saved_inferior
;
1129 /* Wait for an event from child PID. If PID is -1, wait for any
1130 child. Store the stop status through the status pointer WSTAT.
1131 OPTIONS is passed to the waitpid call. Return 0 if no child stop
1132 event was found and OPTIONS contains WNOHANG. Return the PID of
1133 the stopped child otherwise. */
1136 linux_wait_for_event_1 (ptid_t ptid
, int *wstat
, int options
)
1139 struct lwp_info
*event_child
= NULL
;
1141 struct lwp_info
*requested_child
= NULL
;
1143 /* Check for a lwp with a pending status. */
1144 /* It is possible that the user changed the pending task's registers since
1145 it stopped. We correctly handle the change of PC if we hit a breakpoint
1146 (in check_removed_breakpoint); signals should be reported anyway. */
1148 if (ptid_equal (ptid
, minus_one_ptid
)
1149 || ptid_equal (pid_to_ptid (ptid_get_pid (ptid
)), ptid
))
1151 event_child
= (struct lwp_info
*)
1152 find_inferior (&all_lwps
, status_pending_p
, &ptid
);
1153 if (debug_threads
&& event_child
)
1154 fprintf (stderr
, "Got a pending child %ld\n", lwpid_of (event_child
));
1158 requested_child
= find_lwp_pid (ptid
);
1159 if (requested_child
->status_pending_p
1160 && !check_removed_breakpoint (requested_child
))
1161 event_child
= requested_child
;
1164 if (event_child
!= NULL
)
1167 fprintf (stderr
, "Got an event from pending child %ld (%04x)\n",
1168 lwpid_of (event_child
), event_child
->status_pending
);
1169 *wstat
= event_child
->status_pending
;
1170 event_child
->status_pending_p
= 0;
1171 event_child
->status_pending
= 0;
1172 current_inferior
= get_lwp_thread (event_child
);
1173 return lwpid_of (event_child
);
1176 /* We only enter this loop if no process has a pending wait status. Thus
1177 any action taken in response to a wait status inside this loop is
1178 responding as soon as we detect the status, not after any pending
1182 event_child
= linux_wait_for_lwp (ptid
, wstat
, options
);
1184 if ((options
& WNOHANG
) && event_child
== NULL
)
1187 if (event_child
== NULL
)
1188 error ("event from unknown child");
1190 current_inferior
= get_lwp_thread (event_child
);
1192 /* Check for thread exit. */
1193 if (! WIFSTOPPED (*wstat
))
1196 fprintf (stderr
, "LWP %ld exiting\n", lwpid_of (event_child
));
1198 /* If the last thread is exiting, just return. */
1199 if (last_thread_of_process_p (current_inferior
))
1202 fprintf (stderr
, "LWP %ld is last lwp of process\n",
1203 lwpid_of (event_child
));
1204 return lwpid_of (event_child
);
1207 delete_lwp (event_child
);
1211 current_inferior
= (struct thread_info
*) all_threads
.head
;
1213 fprintf (stderr
, "Current inferior is now %ld\n",
1214 lwpid_of (get_thread_lwp (current_inferior
)));
1218 current_inferior
= NULL
;
1220 fprintf (stderr
, "Current inferior is now <NULL>\n");
1223 /* If we were waiting for this particular child to do something...
1224 well, it did something. */
1225 if (requested_child
!= NULL
)
1226 return lwpid_of (event_child
);
1228 /* Wait for a more interesting event. */
1232 if (event_child
->must_set_ptrace_flags
)
1234 ptrace (PTRACE_SETOPTIONS
, lwpid_of (event_child
),
1235 0, (PTRACE_ARG4_TYPE
) PTRACE_O_TRACECLONE
);
1236 event_child
->must_set_ptrace_flags
= 0;
1239 if (WIFSTOPPED (*wstat
)
1240 && WSTOPSIG (*wstat
) == SIGSTOP
1241 && event_child
->stop_expected
)
1244 fprintf (stderr
, "Expected stop.\n");
1245 event_child
->stop_expected
= 0;
1246 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
1250 if (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) == SIGTRAP
1251 && *wstat
>> 16 != 0)
1253 handle_extended_wait (event_child
, *wstat
);
1257 /* If GDB is not interested in this signal, don't stop other
1258 threads, and don't report it to GDB. Just resume the
1259 inferior right away. We do this for threading-related
1260 signals as well as any that GDB specifically requested we
1261 ignore. But never ignore SIGSTOP if we sent it ourselves,
1262 and do not ignore signals when stepping - they may require
1263 special handling to skip the signal handler. */
1264 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
1266 if (WIFSTOPPED (*wstat
)
1267 && !event_child
->stepping
1269 #if defined (USE_THREAD_DB) && defined (__SIGRTMIN)
1270 (current_process ()->private->thread_db
!= NULL
1271 && (WSTOPSIG (*wstat
) == __SIGRTMIN
1272 || WSTOPSIG (*wstat
) == __SIGRTMIN
+ 1))
1275 (pass_signals
[target_signal_from_host (WSTOPSIG (*wstat
))]
1276 && (WSTOPSIG (*wstat
) != SIGSTOP
|| !stopping_threads
))))
1278 siginfo_t info
, *info_p
;
1281 fprintf (stderr
, "Ignored signal %d for LWP %ld.\n",
1282 WSTOPSIG (*wstat
), lwpid_of (event_child
));
1284 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (event_child
), 0, &info
) == 0)
1288 linux_resume_one_lwp (event_child
,
1289 event_child
->stepping
,
1290 WSTOPSIG (*wstat
), info_p
);
1294 /* If this event was not handled above, and is not a SIGTRAP,
1295 report it. SIGILL and SIGSEGV are also treated as traps in case
1296 a breakpoint is inserted at the current PC. */
1297 if (!WIFSTOPPED (*wstat
)
1298 || (WSTOPSIG (*wstat
) != SIGTRAP
&& WSTOPSIG (*wstat
) != SIGILL
1299 && WSTOPSIG (*wstat
) != SIGSEGV
))
1300 return lwpid_of (event_child
);
1302 /* If this target does not support breakpoints, we simply report the
1303 signal; it's of no concern to us. */
1304 if (the_low_target
.get_pc
== NULL
)
1305 return lwpid_of (event_child
);
1307 stop_pc
= get_stop_pc ();
1309 /* Only handle SIGILL or SIGSEGV if we've hit a recognized
1311 if (WSTOPSIG (*wstat
) != SIGTRAP
1312 && (event_child
->stepping
1313 || ! (*the_low_target
.breakpoint_at
) (stop_pc
)))
1314 return lwpid_of (event_child
);
1316 /* bp_reinsert will only be set if we were single-stepping.
1317 Notice that we will resume the process after hitting
1318 a gdbserver breakpoint; single-stepping to/over one
1319 is not supported (yet). */
1320 if (event_child
->bp_reinsert
!= 0)
1323 fprintf (stderr
, "Reinserted breakpoint.\n");
1324 reinsert_breakpoint (event_child
->bp_reinsert
);
1325 event_child
->bp_reinsert
= 0;
1327 /* Clear the single-stepping flag and SIGTRAP as we resume. */
1328 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
1332 bp_status
= check_breakpoints (stop_pc
);
1337 fprintf (stderr
, "Hit a gdbserver breakpoint.\n");
1339 /* We hit one of our own breakpoints. We mark it as a pending
1340 breakpoint, so that check_removed_breakpoint () will do the PC
1341 adjustment for us at the appropriate time. */
1342 event_child
->pending_is_breakpoint
= 1;
1343 event_child
->pending_stop_pc
= stop_pc
;
1345 /* We may need to put the breakpoint back. We continue in the event
1346 loop instead of simply replacing the breakpoint right away,
1347 in order to not lose signals sent to the thread that hit the
1348 breakpoint. Unfortunately this increases the window where another
1349 thread could sneak past the removed breakpoint. For the current
1350 use of server-side breakpoints (thread creation) this is
1351 acceptable; but it needs to be considered before this breakpoint
1352 mechanism can be used in more general ways. For some breakpoints
1353 it may be necessary to stop all other threads, but that should
1354 be avoided where possible.
1356 If breakpoint_reinsert_addr is NULL, that means that we can
1357 use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint,
1358 mark it for reinsertion, and single-step.
1360 Otherwise, call the target function to figure out where we need
1361 our temporary breakpoint, create it, and continue executing this
1364 /* NOTE: we're lifting breakpoints in non-stop mode. This
1365 is currently only used for thread event breakpoints, so
1366 it isn't that bad as long as we have PTRACE_EVENT_CLONE
1369 /* No need to reinsert. */
1370 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
1371 else if (the_low_target
.breakpoint_reinsert_addr
== NULL
)
1373 event_child
->bp_reinsert
= stop_pc
;
1374 uninsert_breakpoint (stop_pc
);
1375 linux_resume_one_lwp (event_child
, 1, 0, NULL
);
1379 reinsert_breakpoint_by_bp
1380 (stop_pc
, (*the_low_target
.breakpoint_reinsert_addr
) ());
1381 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
1388 fprintf (stderr
, "Hit a non-gdbserver breakpoint.\n");
1390 /* If we were single-stepping, we definitely want to report the
1391 SIGTRAP. Although the single-step operation has completed,
1392 do not clear clear the stepping flag yet; we need to check it
1393 in wait_for_sigstop. */
1394 if (event_child
->stepping
)
1395 return lwpid_of (event_child
);
1397 /* A SIGTRAP that we can't explain. It may have been a breakpoint.
1398 Check if it is a breakpoint, and if so mark the process information
1399 accordingly. This will handle both the necessary fiddling with the
1400 PC on decr_pc_after_break targets and suppressing extra threads
1401 hitting a breakpoint if two hit it at once and then GDB removes it
1402 after the first is reported. Arguably it would be better to report
1403 multiple threads hitting breakpoints simultaneously, but the current
1404 remote protocol does not allow this. */
1405 if ((*the_low_target
.breakpoint_at
) (stop_pc
))
1407 event_child
->pending_is_breakpoint
= 1;
1408 event_child
->pending_stop_pc
= stop_pc
;
1411 return lwpid_of (event_child
);
1419 linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
)
1423 if (ptid_is_pid (ptid
))
1425 /* A request to wait for a specific tgid. This is not possible
1426 with waitpid, so instead, we wait for any child, and leave
1427 children we're not interested in right now with a pending
1428 status to report later. */
1429 wait_ptid
= minus_one_ptid
;
1438 event_pid
= linux_wait_for_event_1 (wait_ptid
, wstat
, options
);
1441 && ptid_is_pid (ptid
) && ptid_get_pid (ptid
) != event_pid
)
1443 struct lwp_info
*event_child
= find_lwp_pid (pid_to_ptid (event_pid
));
1445 if (! WIFSTOPPED (*wstat
))
1446 mark_lwp_dead (event_child
, *wstat
);
1449 event_child
->status_pending_p
= 1;
1450 event_child
->status_pending
= *wstat
;
1458 /* Wait for process, returns status. */
1461 linux_wait_1 (ptid_t ptid
,
1462 struct target_waitstatus
*ourstatus
, int target_options
)
1465 struct thread_info
*thread
= NULL
;
1466 struct lwp_info
*lwp
= NULL
;
1470 /* Translate generic target options into linux options. */
1472 if (target_options
& TARGET_WNOHANG
)
1476 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
1478 /* If we were only supposed to resume one thread, only wait for
1479 that thread - if it's still alive. If it died, however - which
1480 can happen if we're coming from the thread death case below -
1481 then we need to make sure we restart the other threads. We could
1482 pick a thread at random or restart all; restarting all is less
1485 && !ptid_equal (cont_thread
, null_ptid
)
1486 && !ptid_equal (cont_thread
, minus_one_ptid
))
1488 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
1491 /* No stepping, no signal - unless one is pending already, of course. */
1494 struct thread_resume resume_info
;
1495 resume_info
.thread
= minus_one_ptid
;
1496 resume_info
.kind
= resume_continue
;
1497 resume_info
.sig
= 0;
1498 linux_resume (&resume_info
, 1);
1504 pid
= linux_wait_for_event (ptid
, &w
, options
);
1505 if (pid
== 0) /* only if TARGET_WNOHANG */
1508 lwp
= get_thread_lwp (current_inferior
);
1510 /* If we are waiting for a particular child, and it exited,
1511 linux_wait_for_event will return its exit status. Similarly if
1512 the last child exited. If this is not the last child, however,
1513 do not report it as exited until there is a 'thread exited' response
1514 available in the remote protocol. Instead, just wait for another event.
1515 This should be safe, because if the thread crashed we will already
1516 have reported the termination signal to GDB; that should stop any
1517 in-progress stepping operations, etc.
1519 Report the exit status of the last thread to exit. This matches
1520 LinuxThreads' behavior. */
1522 if (last_thread_of_process_p (current_inferior
))
1524 if (WIFEXITED (w
) || WIFSIGNALED (w
))
1526 int pid
= pid_of (lwp
);
1527 struct process_info
*process
= find_process_pid (pid
);
1529 #ifdef USE_THREAD_DB
1530 thread_db_free (process
, 0);
1533 linux_remove_process (process
);
1535 current_inferior
= NULL
;
1539 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
1540 ourstatus
->value
.integer
= WEXITSTATUS (w
);
1543 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
1547 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
1548 ourstatus
->value
.sig
= target_signal_from_host (WTERMSIG (w
));
1551 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
1555 return pid_to_ptid (pid
);
1560 if (!WIFSTOPPED (w
))
1564 /* In all-stop, stop all threads. Be careful to only do this if
1565 we're about to report an event to GDB. */
1569 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
1571 if (lwp
->suspended
&& WSTOPSIG (w
) == SIGSTOP
)
1573 /* A thread that has been requested to stop by GDB with vCont;t,
1574 and it stopped cleanly, so report as SIG0. The use of
1575 SIGSTOP is an implementation detail. */
1576 ourstatus
->value
.sig
= TARGET_SIGNAL_0
;
1578 else if (lwp
->suspended
&& WSTOPSIG (w
) != SIGSTOP
)
1580 /* A thread that has been requested to stop by GDB with vCont;t,
1581 but, it stopped for other reasons. Set stop_expected so the
1582 pending SIGSTOP is ignored and the LWP is resumed. */
1583 lwp
->stop_expected
= 1;
1584 ourstatus
->value
.sig
= target_signal_from_host (WSTOPSIG (w
));
1588 ourstatus
->value
.sig
= target_signal_from_host (WSTOPSIG (w
));
1592 fprintf (stderr
, "linux_wait ret = %s, %d, %d\n",
1593 target_pid_to_str (lwp
->head
.id
),
1595 ourstatus
->value
.sig
);
1597 return lwp
->head
.id
;
1600 /* Get rid of any pending event in the pipe. */
1602 async_file_flush (void)
1608 ret
= read (linux_event_pipe
[0], &buf
, 1);
1609 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
1612 /* Put something in the pipe, so the event loop wakes up. */
1614 async_file_mark (void)
1618 async_file_flush ();
1621 ret
= write (linux_event_pipe
[1], "+", 1);
1622 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
1624 /* Ignore EAGAIN. If the pipe is full, the event loop will already
1625 be awakened anyway. */
1629 linux_wait (ptid_t ptid
,
1630 struct target_waitstatus
*ourstatus
, int target_options
)
1635 fprintf (stderr
, "linux_wait: [%s]\n", target_pid_to_str (ptid
));
1637 /* Flush the async file first. */
1638 if (target_is_async_p ())
1639 async_file_flush ();
1641 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
1643 /* If at least one stop was reported, there may be more. A single
1644 SIGCHLD can signal more than one child stop. */
1645 if (target_is_async_p ()
1646 && (target_options
& TARGET_WNOHANG
) != 0
1647 && !ptid_equal (event_ptid
, null_ptid
))
1653 /* Send a signal to an LWP. */
1656 kill_lwp (unsigned long lwpid
, int signo
)
1658 /* Use tkill, if possible, in case we are using nptl threads. If tkill
1659 fails, then we are not using nptl threads and we should be using kill. */
1663 static int tkill_failed
;
1670 ret
= syscall (__NR_tkill
, lwpid
, signo
);
1671 if (errno
!= ENOSYS
)
1678 return kill (lwpid
, signo
);
1682 send_sigstop (struct inferior_list_entry
*entry
)
1684 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1690 pid
= lwpid_of (lwp
);
1692 /* If we already have a pending stop signal for this process, don't
1694 if (lwp
->stop_expected
)
1697 fprintf (stderr
, "Have pending sigstop for lwp %d\n", pid
);
1699 /* We clear the stop_expected flag so that wait_for_sigstop
1700 will receive the SIGSTOP event (instead of silently resuming and
1701 waiting again). It'll be reset below. */
1702 lwp
->stop_expected
= 0;
1707 fprintf (stderr
, "Sending sigstop to lwp %d\n", pid
);
1709 kill_lwp (pid
, SIGSTOP
);
1713 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
1715 /* It's dead, really. */
1718 /* Store the exit status for later. */
1719 lwp
->status_pending_p
= 1;
1720 lwp
->status_pending
= wstat
;
1722 /* So that check_removed_breakpoint doesn't try to figure out if
1723 this is stopped at a breakpoint. */
1724 lwp
->pending_is_breakpoint
= 0;
1726 /* Prevent trying to stop it. */
1729 /* No further stops are expected from a dead lwp. */
1730 lwp
->stop_expected
= 0;
1734 wait_for_sigstop (struct inferior_list_entry
*entry
)
1736 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1737 struct thread_info
*saved_inferior
;
1745 saved_inferior
= current_inferior
;
1746 if (saved_inferior
!= NULL
)
1747 saved_tid
= ((struct inferior_list_entry
*) saved_inferior
)->id
;
1749 saved_tid
= null_ptid
; /* avoid bogus unused warning */
1751 ptid
= lwp
->head
.id
;
1753 linux_wait_for_event (ptid
, &wstat
, __WALL
);
1755 /* If we stopped with a non-SIGSTOP signal, save it for later
1756 and record the pending SIGSTOP. If the process exited, just
1758 if (WIFSTOPPED (wstat
)
1759 && WSTOPSIG (wstat
) != SIGSTOP
)
1762 fprintf (stderr
, "LWP %ld stopped with non-sigstop status %06x\n",
1763 lwpid_of (lwp
), wstat
);
1765 /* Do not leave a pending single-step finish to be reported to
1766 the client. The client will give us a new action for this
1767 thread, possibly a continue request --- otherwise, the client
1768 would consider this pending SIGTRAP reported later a spurious
1770 if (WSTOPSIG (wstat
) == SIGTRAP
1772 && !lwp
->stopped_by_watchpoint
)
1775 fprintf (stderr
, " single-step SIGTRAP ignored\n");
1779 lwp
->status_pending_p
= 1;
1780 lwp
->status_pending
= wstat
;
1782 lwp
->stop_expected
= 1;
1784 else if (!WIFSTOPPED (wstat
))
1787 fprintf (stderr
, "Process %ld exited while stopping LWPs\n",
1790 /* Leave this status pending for the next time we're able to
1791 report it. In the mean time, we'll report this lwp as dead
1792 to GDB, so GDB doesn't try to read registers and memory from
1794 mark_lwp_dead (lwp
, wstat
);
1797 if (saved_inferior
== NULL
|| linux_thread_alive (saved_tid
))
1798 current_inferior
= saved_inferior
;
1802 fprintf (stderr
, "Previously current thread died.\n");
1806 /* We can't change the current inferior behind GDB's back,
1807 otherwise, a subsequent command may apply to the wrong
1809 current_inferior
= NULL
;
1813 /* Set a valid thread as current. */
1814 set_desired_inferior (0);
1820 stop_all_lwps (void)
1822 stopping_threads
= 1;
1823 for_each_inferior (&all_lwps
, send_sigstop
);
1824 for_each_inferior (&all_lwps
, wait_for_sigstop
);
1825 stopping_threads
= 0;
1828 /* Resume execution of the inferior process.
1829 If STEP is nonzero, single-step it.
1830 If SIGNAL is nonzero, give it that signal. */
1833 linux_resume_one_lwp (struct lwp_info
*lwp
,
1834 int step
, int signal
, siginfo_t
*info
)
1836 struct thread_info
*saved_inferior
;
1838 if (lwp
->stopped
== 0)
1841 /* If we have pending signals or status, and a new signal, enqueue the
1842 signal. Also enqueue the signal if we are waiting to reinsert a
1843 breakpoint; it will be picked up again below. */
1845 && (lwp
->status_pending_p
|| lwp
->pending_signals
!= NULL
1846 || lwp
->bp_reinsert
!= 0))
1848 struct pending_signals
*p_sig
;
1849 p_sig
= xmalloc (sizeof (*p_sig
));
1850 p_sig
->prev
= lwp
->pending_signals
;
1851 p_sig
->signal
= signal
;
1853 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1855 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
1856 lwp
->pending_signals
= p_sig
;
1859 if (lwp
->status_pending_p
&& !check_removed_breakpoint (lwp
))
1862 saved_inferior
= current_inferior
;
1863 current_inferior
= get_lwp_thread (lwp
);
1866 fprintf (stderr
, "Resuming lwp %ld (%s, signal %d, stop %s)\n",
1867 lwpid_of (lwp
), step
? "step" : "continue", signal
,
1868 lwp
->stop_expected
? "expected" : "not expected");
1870 /* This bit needs some thinking about. If we get a signal that
1871 we must report while a single-step reinsert is still pending,
1872 we often end up resuming the thread. It might be better to
1873 (ew) allow a stack of pending events; then we could be sure that
1874 the reinsert happened right away and not lose any signals.
1876 Making this stack would also shrink the window in which breakpoints are
1877 uninserted (see comment in linux_wait_for_lwp) but not enough for
1878 complete correctness, so it won't solve that problem. It may be
1879 worthwhile just to solve this one, however. */
1880 if (lwp
->bp_reinsert
!= 0)
1883 fprintf (stderr
, " pending reinsert at %08lx", (long)lwp
->bp_reinsert
);
1885 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
1888 /* Postpone any pending signal. It was enqueued above. */
1892 check_removed_breakpoint (lwp
);
1894 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
1896 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
1897 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
1898 fprintf (stderr
, " resuming from pc 0x%lx\n", (long) pc
);
1901 /* If we have pending signals, consume one unless we are trying to reinsert
1903 if (lwp
->pending_signals
!= NULL
&& lwp
->bp_reinsert
== 0)
1905 struct pending_signals
**p_sig
;
1907 p_sig
= &lwp
->pending_signals
;
1908 while ((*p_sig
)->prev
!= NULL
)
1909 p_sig
= &(*p_sig
)->prev
;
1911 signal
= (*p_sig
)->signal
;
1912 if ((*p_sig
)->info
.si_signo
!= 0)
1913 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), 0, &(*p_sig
)->info
);
1919 if (the_low_target
.prepare_to_resume
!= NULL
)
1920 the_low_target
.prepare_to_resume (lwp
);
1922 regcache_invalidate_one ((struct inferior_list_entry
*)
1923 get_lwp_thread (lwp
));
1926 lwp
->stopped_by_watchpoint
= 0;
1927 lwp
->stepping
= step
;
1928 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (lwp
), 0,
1929 /* Coerce to a uintptr_t first to avoid potential gcc warning
1930 of coercing an 8 byte integer to a 4 byte pointer. */
1931 (PTRACE_ARG4_TYPE
) (uintptr_t) signal
);
1933 current_inferior
= saved_inferior
;
1936 /* ESRCH from ptrace either means that the thread was already
1937 running (an error) or that it is gone (a race condition). If
1938 it's gone, we will get a notification the next time we wait,
1939 so we can ignore the error. We could differentiate these
1940 two, but it's tricky without waiting; the thread still exists
1941 as a zombie, so sending it signal 0 would succeed. So just
1946 perror_with_name ("ptrace");
1950 struct thread_resume_array
1952 struct thread_resume
*resume
;
1956 /* This function is called once per thread. We look up the thread
1957 in RESUME_PTR, and mark the thread with a pointer to the appropriate
1960 This algorithm is O(threads * resume elements), but resume elements
1961 is small (and will remain small at least until GDB supports thread
1964 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
1966 struct lwp_info
*lwp
;
1967 struct thread_info
*thread
;
1969 struct thread_resume_array
*r
;
1971 thread
= (struct thread_info
*) entry
;
1972 lwp
= get_thread_lwp (thread
);
1975 for (ndx
= 0; ndx
< r
->n
; ndx
++)
1977 ptid_t ptid
= r
->resume
[ndx
].thread
;
1978 if (ptid_equal (ptid
, minus_one_ptid
)
1979 || ptid_equal (ptid
, entry
->id
)
1980 || (ptid_is_pid (ptid
)
1981 && (ptid_get_pid (ptid
) == pid_of (lwp
)))
1982 || (ptid_get_lwp (ptid
) == -1
1983 && (ptid_get_pid (ptid
) == pid_of (lwp
))))
1985 lwp
->resume
= &r
->resume
[ndx
];
1990 /* No resume action for this thread. */
1997 /* Set *FLAG_P if this lwp has an interesting status pending. */
1999 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
2001 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2003 /* LWPs which will not be resumed are not interesting, because
2004 we might not wait for them next time through linux_wait. */
2005 if (lwp
->resume
== NULL
)
2008 /* If this thread has a removed breakpoint, we won't have any
2009 events to report later, so check now. check_removed_breakpoint
2010 may clear status_pending_p. We avoid calling check_removed_breakpoint
2011 for any thread that we are not otherwise going to resume - this
2012 lets us preserve stopped status when two threads hit a breakpoint.
2013 GDB removes the breakpoint to single-step a particular thread
2014 past it, then re-inserts it and resumes all threads. We want
2015 to report the second thread without resuming it in the interim. */
2016 if (lwp
->status_pending_p
)
2017 check_removed_breakpoint (lwp
);
2019 if (lwp
->status_pending_p
)
2020 * (int *) flag_p
= 1;
2025 /* This function is called once per thread. We check the thread's resume
2026 request, which will tell us whether to resume, step, or leave the thread
2027 stopped; and what signal, if any, it should be sent.
2029 For threads which we aren't explicitly told otherwise, we preserve
2030 the stepping flag; this is used for stepping over gdbserver-placed
2033 If pending_flags was set in any thread, we queue any needed
2034 signals, since we won't actually resume. We already have a pending
2035 event to report, so we don't need to preserve any step requests;
2036 they should be re-issued if necessary. */
2039 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
2041 struct lwp_info
*lwp
;
2042 struct thread_info
*thread
;
2044 int pending_flag
= * (int *) arg
;
2046 thread
= (struct thread_info
*) entry
;
2047 lwp
= get_thread_lwp (thread
);
2049 if (lwp
->resume
== NULL
)
2052 if (lwp
->resume
->kind
== resume_stop
)
2055 fprintf (stderr
, "suspending LWP %ld\n", lwpid_of (lwp
));
2060 fprintf (stderr
, "running -> suspending LWP %ld\n", lwpid_of (lwp
));
2063 send_sigstop (&lwp
->head
);
2070 fprintf (stderr
, "already stopped/suspended LWP %ld\n",
2073 fprintf (stderr
, "already stopped/not suspended LWP %ld\n",
2077 /* Make sure we leave the LWP suspended, so we don't try to
2078 resume it without GDB telling us to. FIXME: The LWP may
2079 have been stopped in an internal event that was not meant
2080 to be notified back to GDB (e.g., gdbserver breakpoint),
2081 so we should be reporting a stop event in that case
2086 /* For stop requests, we're done. */
2093 /* If this thread which is about to be resumed has a pending status,
2094 then don't resume any threads - we can just report the pending
2095 status. Make sure to queue any signals that would otherwise be
2096 sent. In all-stop mode, we do this decision based on if *any*
2097 thread has a pending status. */
2099 resume_status_pending_p (&lwp
->head
, &pending_flag
);
2104 fprintf (stderr
, "resuming LWP %ld\n", lwpid_of (lwp
));
2106 if (ptid_equal (lwp
->resume
->thread
, minus_one_ptid
)
2108 && lwp
->pending_is_breakpoint
)
2111 step
= (lwp
->resume
->kind
== resume_step
);
2113 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
2118 fprintf (stderr
, "leaving LWP %ld stopped\n", lwpid_of (lwp
));
2120 /* If we have a new signal, enqueue the signal. */
2121 if (lwp
->resume
->sig
!= 0)
2123 struct pending_signals
*p_sig
;
2124 p_sig
= xmalloc (sizeof (*p_sig
));
2125 p_sig
->prev
= lwp
->pending_signals
;
2126 p_sig
->signal
= lwp
->resume
->sig
;
2127 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
2129 /* If this is the same signal we were previously stopped by,
2130 make sure to queue its siginfo. We can ignore the return
2131 value of ptrace; if it fails, we'll skip
2132 PTRACE_SETSIGINFO. */
2133 if (WIFSTOPPED (lwp
->last_status
)
2134 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
2135 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), 0, &p_sig
->info
);
2137 lwp
->pending_signals
= p_sig
;
2146 linux_resume (struct thread_resume
*resume_info
, size_t n
)
2149 struct thread_resume_array array
= { resume_info
, n
};
2151 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
2153 /* If there is a thread which would otherwise be resumed, which
2154 has a pending status, then don't resume any threads - we can just
2155 report the pending status. Make sure to queue any signals
2156 that would otherwise be sent. In non-stop mode, we'll apply this
2157 logic to each thread individually. */
2160 find_inferior (&all_lwps
, resume_status_pending_p
, &pending_flag
);
2165 fprintf (stderr
, "Not resuming, pending status\n");
2167 fprintf (stderr
, "Resuming, no pending status\n");
2170 find_inferior (&all_threads
, linux_resume_one_thread
, &pending_flag
);
2173 #ifdef HAVE_LINUX_USRREGS
2176 register_addr (int regnum
)
2180 if (regnum
< 0 || regnum
>= the_low_target
.num_regs
)
2181 error ("Invalid register number %d.", regnum
);
2183 addr
= the_low_target
.regmap
[regnum
];
2188 /* Fetch one register. */
2190 fetch_register (struct regcache
*regcache
, int regno
)
2197 if (regno
>= the_low_target
.num_regs
)
2199 if ((*the_low_target
.cannot_fetch_register
) (regno
))
2202 regaddr
= register_addr (regno
);
2206 pid
= lwpid_of (get_thread_lwp (current_inferior
));
2207 size
= ((register_size (regno
) + sizeof (PTRACE_XFER_TYPE
) - 1)
2208 & - sizeof (PTRACE_XFER_TYPE
));
2209 buf
= alloca (size
);
2210 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
2213 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
2214 ptrace (PTRACE_PEEKUSER
, pid
,
2215 /* Coerce to a uintptr_t first to avoid potential gcc warning
2216 of coercing an 8 byte integer to a 4 byte pointer. */
2217 (PTRACE_ARG3_TYPE
) (uintptr_t) regaddr
, 0);
2218 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
2221 /* Warning, not error, in case we are attached; sometimes the
2222 kernel doesn't let us at the registers. */
2223 char *err
= strerror (errno
);
2224 char *msg
= alloca (strlen (err
) + 128);
2225 sprintf (msg
, "reading register %d: %s", regno
, err
);
2231 if (the_low_target
.supply_ptrace_register
)
2232 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
2234 supply_register (regcache
, regno
, buf
);
2239 /* Fetch all registers, or just one, from the child process. */
2241 usr_fetch_inferior_registers (struct regcache
*regcache
, int regno
)
2244 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
2245 fetch_register (regcache
, regno
);
2247 fetch_register (regcache
, regno
);
2250 /* Store our register values back into the inferior.
2251 If REGNO is -1, do this for all registers.
2252 Otherwise, REGNO specifies which register (so we can save time). */
2254 usr_store_inferior_registers (struct regcache
*regcache
, int regno
)
2263 if (regno
>= the_low_target
.num_regs
)
2266 if ((*the_low_target
.cannot_store_register
) (regno
) == 1)
2269 regaddr
= register_addr (regno
);
2273 size
= (register_size (regno
) + sizeof (PTRACE_XFER_TYPE
) - 1)
2274 & - sizeof (PTRACE_XFER_TYPE
);
2275 buf
= alloca (size
);
2276 memset (buf
, 0, size
);
2278 if (the_low_target
.collect_ptrace_register
)
2279 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
2281 collect_register (regcache
, regno
, buf
);
2283 pid
= lwpid_of (get_thread_lwp (current_inferior
));
2284 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
2287 ptrace (PTRACE_POKEUSER
, pid
,
2288 /* Coerce to a uintptr_t first to avoid potential gcc warning
2289 about coercing an 8 byte integer to a 4 byte pointer. */
2290 (PTRACE_ARG3_TYPE
) (uintptr_t) regaddr
,
2291 (PTRACE_ARG4_TYPE
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
2294 /* At this point, ESRCH should mean the process is
2295 already gone, in which case we simply ignore attempts
2296 to change its registers. See also the related
2297 comment in linux_resume_one_lwp. */
2301 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
2303 char *err
= strerror (errno
);
2304 char *msg
= alloca (strlen (err
) + 128);
2305 sprintf (msg
, "writing register %d: %s",
2311 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
2315 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
2316 usr_store_inferior_registers (regcache
, regno
);
2318 #endif /* HAVE_LINUX_USRREGS */
2322 #ifdef HAVE_LINUX_REGSETS
2325 regsets_fetch_inferior_registers (struct regcache
*regcache
)
2327 struct regset_info
*regset
;
2328 int saw_general_regs
= 0;
2331 regset
= target_regsets
;
2333 pid
= lwpid_of (get_thread_lwp (current_inferior
));
2334 while (regset
->size
>= 0)
2339 if (regset
->size
== 0 || disabled_regsets
[regset
- target_regsets
])
2345 buf
= xmalloc (regset
->size
);
2347 res
= ptrace (regset
->get_request
, pid
, 0, buf
);
2349 res
= ptrace (regset
->get_request
, pid
, buf
, 0);
2355 /* If we get EIO on a regset, do not try it again for
2357 disabled_regsets
[regset
- target_regsets
] = 1;
2364 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
2369 else if (regset
->type
== GENERAL_REGS
)
2370 saw_general_regs
= 1;
2371 regset
->store_function (regcache
, buf
);
2375 if (saw_general_regs
)
2382 regsets_store_inferior_registers (struct regcache
*regcache
)
2384 struct regset_info
*regset
;
2385 int saw_general_regs
= 0;
2388 regset
= target_regsets
;
2390 pid
= lwpid_of (get_thread_lwp (current_inferior
));
2391 while (regset
->size
>= 0)
2396 if (regset
->size
== 0 || disabled_regsets
[regset
- target_regsets
])
2402 buf
= xmalloc (regset
->size
);
2404 /* First fill the buffer with the current register set contents,
2405 in case there are any items in the kernel's regset that are
2406 not in gdbserver's regcache. */
2408 res
= ptrace (regset
->get_request
, pid
, 0, buf
);
2410 res
= ptrace (regset
->get_request
, pid
, buf
, 0);
2415 /* Then overlay our cached registers on that. */
2416 regset
->fill_function (regcache
, buf
);
2418 /* Only now do we write the register set. */
2420 res
= ptrace (regset
->set_request
, pid
, 0, buf
);
2422 res
= ptrace (regset
->set_request
, pid
, buf
, 0);
2430 /* If we get EIO on a regset, do not try it again for
2432 disabled_regsets
[regset
- target_regsets
] = 1;
2436 else if (errno
== ESRCH
)
2438 /* At this point, ESRCH should mean the process is
2439 already gone, in which case we simply ignore attempts
2440 to change its registers. See also the related
2441 comment in linux_resume_one_lwp. */
2447 perror ("Warning: ptrace(regsets_store_inferior_registers)");
2450 else if (regset
->type
== GENERAL_REGS
)
2451 saw_general_regs
= 1;
2455 if (saw_general_regs
)
2462 #endif /* HAVE_LINUX_REGSETS */
2466 linux_fetch_registers (struct regcache
*regcache
, int regno
)
2468 #ifdef HAVE_LINUX_REGSETS
2469 if (regsets_fetch_inferior_registers (regcache
) == 0)
2472 #ifdef HAVE_LINUX_USRREGS
2473 usr_fetch_inferior_registers (regcache
, regno
);
2478 linux_store_registers (struct regcache
*regcache
, int regno
)
2480 #ifdef HAVE_LINUX_REGSETS
2481 if (regsets_store_inferior_registers (regcache
) == 0)
2484 #ifdef HAVE_LINUX_USRREGS
2485 usr_store_inferior_registers (regcache
, regno
);
2490 /* Copy LEN bytes from inferior's memory starting at MEMADDR
2491 to debugger memory starting at MYADDR. */
2494 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
2497 /* Round starting address down to longword boundary. */
2498 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
2499 /* Round ending address up; get number of longwords that makes. */
2501 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
2502 / sizeof (PTRACE_XFER_TYPE
);
2503 /* Allocate buffer of that many longwords. */
2504 register PTRACE_XFER_TYPE
*buffer
2505 = (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
2508 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
2510 /* Try using /proc. Don't bother for one word. */
2511 if (len
>= 3 * sizeof (long))
2513 /* We could keep this file open and cache it - possibly one per
2514 thread. That requires some juggling, but is even faster. */
2515 sprintf (filename
, "/proc/%d/mem", pid
);
2516 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
2520 /* If pread64 is available, use it. It's faster if the kernel
2521 supports it (only one syscall), and it's 64-bit safe even on
2522 32-bit platforms (for instance, SPARC debugging a SPARC64
2525 if (pread64 (fd
, myaddr
, len
, memaddr
) != len
)
2527 if (lseek (fd
, memaddr
, SEEK_SET
) == -1 || read (fd
, myaddr
, len
) != len
)
2539 /* Read all the longwords */
2540 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
2543 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
2544 about coercing an 8 byte integer to a 4 byte pointer. */
2545 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
2546 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
, 0);
2551 /* Copy appropriate bytes out of the buffer. */
2553 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
2559 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
2560 memory at MEMADDR. On failure (cannot write to the inferior)
2561 returns the value of errno. */
2564 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
2567 /* Round starting address down to longword boundary. */
2568 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
2569 /* Round ending address up; get number of longwords that makes. */
2571 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1) / sizeof (PTRACE_XFER_TYPE
);
2572 /* Allocate buffer of that many longwords. */
2573 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
2574 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
2578 /* Dump up to four bytes. */
2579 unsigned int val
= * (unsigned int *) myaddr
;
2585 val
= val
& 0xffffff;
2586 fprintf (stderr
, "Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
2587 val
, (long)memaddr
);
2590 /* Fill start and end extra bytes of buffer with existing memory data. */
2593 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
2594 about coercing an 8 byte integer to a 4 byte pointer. */
2595 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
2596 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
, 0);
2604 = ptrace (PTRACE_PEEKTEXT
, pid
,
2605 /* Coerce to a uintptr_t first to avoid potential gcc warning
2606 about coercing an 8 byte integer to a 4 byte pointer. */
2607 (PTRACE_ARG3_TYPE
) (uintptr_t) (addr
+ (count
- 1)
2608 * sizeof (PTRACE_XFER_TYPE
)),
2614 /* Copy data to be written over corresponding part of buffer. */
2616 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)), myaddr
, len
);
2618 /* Write the entire buffer. */
2620 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
2623 ptrace (PTRACE_POKETEXT
, pid
,
2624 /* Coerce to a uintptr_t first to avoid potential gcc warning
2625 about coercing an 8 byte integer to a 4 byte pointer. */
2626 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
,
2627 (PTRACE_ARG4_TYPE
) buffer
[i
]);
2635 /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */
2636 static int linux_supports_tracefork_flag
;
2638 /* Helper functions for linux_test_for_tracefork, called via clone (). */
2641 linux_tracefork_grandchild (void *arg
)
2646 #define STACK_SIZE 4096
2649 linux_tracefork_child (void *arg
)
2651 ptrace (PTRACE_TRACEME
, 0, 0, 0);
2652 kill (getpid (), SIGSTOP
);
2654 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
2657 linux_tracefork_grandchild (NULL
);
2659 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2662 __clone2 (linux_tracefork_grandchild
, arg
, STACK_SIZE
,
2663 CLONE_VM
| SIGCHLD
, NULL
);
2665 clone (linux_tracefork_grandchild
, arg
+ STACK_SIZE
,
2666 CLONE_VM
| SIGCHLD
, NULL
);
2669 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2674 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make
2675 sure that we can enable the option, and that it had the desired
2679 linux_test_for_tracefork (void)
2681 int child_pid
, ret
, status
;
2683 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
2684 char *stack
= xmalloc (STACK_SIZE
* 4);
2685 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2687 linux_supports_tracefork_flag
= 0;
2689 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
2691 child_pid
= fork ();
2693 linux_tracefork_child (NULL
);
2695 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2697 /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */
2699 child_pid
= __clone2 (linux_tracefork_child
, stack
, STACK_SIZE
,
2700 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
2701 #else /* !__ia64__ */
2702 child_pid
= clone (linux_tracefork_child
, stack
+ STACK_SIZE
,
2703 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
2704 #endif /* !__ia64__ */
2706 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2708 if (child_pid
== -1)
2709 perror_with_name ("clone");
2711 ret
= my_waitpid (child_pid
, &status
, 0);
2713 perror_with_name ("waitpid");
2714 else if (ret
!= child_pid
)
2715 error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret
);
2716 if (! WIFSTOPPED (status
))
2717 error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status
);
2719 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, 0,
2720 (PTRACE_ARG4_TYPE
) PTRACE_O_TRACEFORK
);
2723 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
2726 warning ("linux_test_for_tracefork: failed to kill child");
2730 ret
= my_waitpid (child_pid
, &status
, 0);
2731 if (ret
!= child_pid
)
2732 warning ("linux_test_for_tracefork: failed to wait for killed child");
2733 else if (!WIFSIGNALED (status
))
2734 warning ("linux_test_for_tracefork: unexpected wait status 0x%x from "
2735 "killed child", status
);
2740 ret
= ptrace (PTRACE_CONT
, child_pid
, 0, 0);
2742 warning ("linux_test_for_tracefork: failed to resume child");
2744 ret
= my_waitpid (child_pid
, &status
, 0);
2746 if (ret
== child_pid
&& WIFSTOPPED (status
)
2747 && status
>> 16 == PTRACE_EVENT_FORK
)
2750 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, 0, &second_pid
);
2751 if (ret
== 0 && second_pid
!= 0)
2755 linux_supports_tracefork_flag
= 1;
2756 my_waitpid (second_pid
, &second_status
, 0);
2757 ret
= ptrace (PTRACE_KILL
, second_pid
, 0, 0);
2759 warning ("linux_test_for_tracefork: failed to kill second child");
2760 my_waitpid (second_pid
, &status
, 0);
2764 warning ("linux_test_for_tracefork: unexpected result from waitpid "
2765 "(%d, status 0x%x)", ret
, status
);
2769 ret
= ptrace (PTRACE_KILL
, child_pid
, 0, 0);
2771 warning ("linux_test_for_tracefork: failed to kill child");
2772 my_waitpid (child_pid
, &status
, 0);
2774 while (WIFSTOPPED (status
));
2776 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
2778 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
2783 linux_look_up_symbols (void)
2785 #ifdef USE_THREAD_DB
2786 struct process_info
*proc
= current_process ();
2788 if (proc
->private->thread_db
!= NULL
)
2791 /* If the kernel supports tracing forks then it also supports tracing
2792 clones, and then we don't need to use the magic thread event breakpoint
2793 to learn about threads. */
2794 thread_db_init (!linux_supports_tracefork_flag
);
2799 linux_request_interrupt (void)
2801 extern unsigned long signal_pid
;
2803 if (!ptid_equal (cont_thread
, null_ptid
)
2804 && !ptid_equal (cont_thread
, minus_one_ptid
))
2806 struct lwp_info
*lwp
;
2809 lwp
= get_thread_lwp (current_inferior
);
2810 lwpid
= lwpid_of (lwp
);
2811 kill_lwp (lwpid
, SIGINT
);
2814 kill_lwp (signal_pid
, SIGINT
);
2817 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
2818 to debugger memory starting at MYADDR. */
2821 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
2823 char filename
[PATH_MAX
];
2825 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
2827 snprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
2829 fd
= open (filename
, O_RDONLY
);
2833 if (offset
!= (CORE_ADDR
) 0
2834 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
2837 n
= read (fd
, myaddr
, len
);
2844 /* These breakpoint and watchpoint related wrapper functions simply
2845 pass on the function call if the target has registered a
2846 corresponding function. */
2849 linux_insert_point (char type
, CORE_ADDR addr
, int len
)
2851 if (the_low_target
.insert_point
!= NULL
)
2852 return the_low_target
.insert_point (type
, addr
, len
);
2854 /* Unsupported (see target.h). */
2859 linux_remove_point (char type
, CORE_ADDR addr
, int len
)
2861 if (the_low_target
.remove_point
!= NULL
)
2862 return the_low_target
.remove_point (type
, addr
, len
);
2864 /* Unsupported (see target.h). */
2869 linux_stopped_by_watchpoint (void)
2871 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
2873 return lwp
->stopped_by_watchpoint
;
2877 linux_stopped_data_address (void)
2879 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
2881 return lwp
->stopped_data_address
;
2884 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
2885 #if defined(__mcoldfire__)
2886 /* These should really be defined in the kernel's ptrace.h header. */
2887 #define PT_TEXT_ADDR 49*4
2888 #define PT_DATA_ADDR 50*4
2889 #define PT_TEXT_END_ADDR 51*4
2892 /* Under uClinux, programs are loaded at non-zero offsets, which we need
2893 to tell gdb about. */
2896 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
2898 #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR)
2899 unsigned long text
, text_end
, data
;
2900 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
2904 text
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_TEXT_ADDR
, 0);
2905 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_TEXT_END_ADDR
, 0);
2906 data
= ptrace (PTRACE_PEEKUSER
, pid
, (long)PT_DATA_ADDR
, 0);
2910 /* Both text and data offsets produced at compile-time (and so
2911 used by gdb) are relative to the beginning of the program,
2912 with the data segment immediately following the text segment.
2913 However, the actual runtime layout in memory may put the data
2914 somewhere else, so when we send gdb a data base-address, we
2915 use the real data base address and subtract the compile-time
2916 data base-address from it (which is just the length of the
2917 text segment). BSS immediately follows data in both
2920 *data_p
= data
- (text_end
- text
);
2930 compare_ints (const void *xa
, const void *xb
)
2932 int a
= *(const int *)xa
;
2933 int b
= *(const int *)xb
;
2939 unique (int *b
, int *e
)
2948 /* Given PID, iterates over all threads in that process.
2950 Information about each thread, in a format suitable for qXfer:osdata:thread
2951 is printed to BUFFER, if it's not NULL. BUFFER is assumed to be already
2952 initialized, and the caller is responsible for finishing and appending '\0'
2955 The list of cores that threads are running on is assigned to *CORES, if it
2956 is not NULL. If no cores are found, *CORES will be set to NULL. Caller
2957 should free *CORES. */
2960 list_threads (int pid
, struct buffer
*buffer
, char **cores
)
2964 int *core_numbers
= xmalloc (sizeof (int) * allocated
);
2968 struct stat statbuf
;
2970 sprintf (pathname
, "/proc/%d/task", pid
);
2971 if (stat (pathname
, &statbuf
) == 0 && S_ISDIR (statbuf
.st_mode
))
2973 dir
= opendir (pathname
);
2976 free (core_numbers
);
2980 while ((dp
= readdir (dir
)) != NULL
)
2982 unsigned long lwp
= strtoul (dp
->d_name
, NULL
, 10);
2986 unsigned core
= linux_core_of_thread (ptid_build (pid
, lwp
, 0));
2990 char s
[sizeof ("4294967295")];
2991 sprintf (s
, "%u", core
);
2993 if (count
== allocated
)
2996 core_numbers
= realloc (core_numbers
,
2997 sizeof (int) * allocated
);
2999 core_numbers
[count
++] = core
;
3001 buffer_xml_printf (buffer
,
3003 "<column name=\"pid\">%d</column>"
3004 "<column name=\"tid\">%s</column>"
3005 "<column name=\"core\">%s</column>"
3006 "</item>", pid
, dp
->d_name
, s
);
3011 buffer_xml_printf (buffer
,
3013 "<column name=\"pid\">%d</column>"
3014 "<column name=\"tid\">%s</column>"
3015 "</item>", pid
, dp
->d_name
);
3026 struct buffer buffer2
;
3029 qsort (core_numbers
, count
, sizeof (int), compare_ints
);
3031 /* Remove duplicates. */
3033 e
= unique (b
, core_numbers
+ count
);
3035 buffer_init (&buffer2
);
3037 for (b
= core_numbers
; b
!= e
; ++b
)
3039 char number
[sizeof ("4294967295")];
3040 sprintf (number
, "%u", *b
);
3041 buffer_xml_printf (&buffer2
, "%s%s",
3042 (b
== core_numbers
) ? "" : ",", number
);
3044 buffer_grow_str0 (&buffer2
, "");
3046 *cores
= buffer_finish (&buffer2
);
3049 free (core_numbers
);
3053 show_process (int pid
, const char *username
, struct buffer
*buffer
)
3057 char cmd
[MAXPATHLEN
+ 1];
3059 sprintf (pathname
, "/proc/%d/cmdline", pid
);
3061 if ((f
= fopen (pathname
, "r")) != NULL
)
3063 size_t len
= fread (cmd
, 1, sizeof (cmd
) - 1, f
);
3068 for (i
= 0; i
< len
; i
++)
3073 buffer_xml_printf (buffer
,
3075 "<column name=\"pid\">%d</column>"
3076 "<column name=\"user\">%s</column>"
3077 "<column name=\"command\">%s</column>",
3082 /* This only collects core numbers, and does not print threads. */
3083 list_threads (pid
, NULL
, &cores
);
3087 buffer_xml_printf (buffer
,
3088 "<column name=\"cores\">%s</column>", cores
);
3092 buffer_xml_printf (buffer
, "</item>");
3099 linux_qxfer_osdata (const char *annex
,
3100 unsigned char *readbuf
, unsigned const char *writebuf
,
3101 CORE_ADDR offset
, int len
)
3103 /* We make the process list snapshot when the object starts to be
3105 static const char *buf
;
3106 static long len_avail
= -1;
3107 static struct buffer buffer
;
3113 if (strcmp (annex
, "processes") == 0)
3115 else if (strcmp (annex
, "threads") == 0)
3120 if (!readbuf
|| writebuf
)
3125 if (len_avail
!= -1 && len_avail
!= 0)
3126 buffer_free (&buffer
);
3129 buffer_init (&buffer
);
3131 buffer_grow_str (&buffer
, "<osdata type=\"processes\">");
3133 buffer_grow_str (&buffer
, "<osdata type=\"threads\">");
3135 dirp
= opendir ("/proc");
3139 while ((dp
= readdir (dirp
)) != NULL
)
3141 struct stat statbuf
;
3142 char procentry
[sizeof ("/proc/4294967295")];
3144 if (!isdigit (dp
->d_name
[0])
3145 || strlen (dp
->d_name
) > sizeof ("4294967295") - 1)
3148 sprintf (procentry
, "/proc/%s", dp
->d_name
);
3149 if (stat (procentry
, &statbuf
) == 0
3150 && S_ISDIR (statbuf
.st_mode
))
3152 int pid
= (int) strtoul (dp
->d_name
, NULL
, 10);
3156 struct passwd
*entry
= getpwuid (statbuf
.st_uid
);
3157 show_process (pid
, entry
? entry
->pw_name
: "?", &buffer
);
3161 list_threads (pid
, &buffer
, NULL
);
3168 buffer_grow_str0 (&buffer
, "</osdata>\n");
3169 buf
= buffer_finish (&buffer
);
3170 len_avail
= strlen (buf
);
3173 if (offset
>= len_avail
)
3175 /* Done. Get rid of the data. */
3176 buffer_free (&buffer
);
3182 if (len
> len_avail
- offset
)
3183 len
= len_avail
- offset
;
3184 memcpy (readbuf
, buf
+ offset
, len
);
3189 /* Convert a native/host siginfo object, into/from the siginfo in the
3190 layout of the inferiors' architecture. */
3193 siginfo_fixup (struct siginfo
*siginfo
, void *inf_siginfo
, int direction
)
3197 if (the_low_target
.siginfo_fixup
!= NULL
)
3198 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
3200 /* If there was no callback, or the callback didn't do anything,
3201 then just do a straight memcpy. */
3205 memcpy (siginfo
, inf_siginfo
, sizeof (struct siginfo
));
3207 memcpy (inf_siginfo
, siginfo
, sizeof (struct siginfo
));
3212 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
3213 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
3216 struct siginfo siginfo
;
3217 char inf_siginfo
[sizeof (struct siginfo
)];
3219 if (current_inferior
== NULL
)
3222 pid
= lwpid_of (get_thread_lwp (current_inferior
));
3225 fprintf (stderr
, "%s siginfo for lwp %d.\n",
3226 readbuf
!= NULL
? "Reading" : "Writing",
3229 if (offset
> sizeof (siginfo
))
3232 if (ptrace (PTRACE_GETSIGINFO
, pid
, 0, &siginfo
) != 0)
3235 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
3236 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
3237 inferior with a 64-bit GDBSERVER should look the same as debugging it
3238 with a 32-bit GDBSERVER, we need to convert it. */
3239 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
3241 if (offset
+ len
> sizeof (siginfo
))
3242 len
= sizeof (siginfo
) - offset
;
3244 if (readbuf
!= NULL
)
3245 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
3248 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
3250 /* Convert back to ptrace layout before flushing it out. */
3251 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
3253 if (ptrace (PTRACE_SETSIGINFO
, pid
, 0, &siginfo
) != 0)
3260 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
3261 so we notice when children change state; as the handler for the
3262 sigsuspend in my_waitpid. */
3265 sigchld_handler (int signo
)
3267 int old_errno
= errno
;
3270 /* fprintf is not async-signal-safe, so call write directly. */
3271 write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1);
3273 if (target_is_async_p ())
3274 async_file_mark (); /* trigger a linux_wait */
3280 linux_supports_non_stop (void)
3286 linux_async (int enable
)
3288 int previous
= (linux_event_pipe
[0] != -1);
3290 if (previous
!= enable
)
3293 sigemptyset (&mask
);
3294 sigaddset (&mask
, SIGCHLD
);
3296 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
3300 if (pipe (linux_event_pipe
) == -1)
3301 fatal ("creating event pipe failed.");
3303 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
3304 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
3306 /* Register the event loop handler. */
3307 add_file_handler (linux_event_pipe
[0],
3308 handle_target_event
, NULL
);
3310 /* Always trigger a linux_wait. */
3315 delete_file_handler (linux_event_pipe
[0]);
3317 close (linux_event_pipe
[0]);
3318 close (linux_event_pipe
[1]);
3319 linux_event_pipe
[0] = -1;
3320 linux_event_pipe
[1] = -1;
3323 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
3330 linux_start_non_stop (int nonstop
)
3332 /* Register or unregister from event-loop accordingly. */
3333 linux_async (nonstop
);
3338 linux_supports_multi_process (void)
3344 /* Enumerate spufs IDs for process PID. */
3346 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
3352 struct dirent
*entry
;
3354 sprintf (path
, "/proc/%ld/fd", pid
);
3355 dir
= opendir (path
);
3360 while ((entry
= readdir (dir
)) != NULL
)
3366 fd
= atoi (entry
->d_name
);
3370 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
3371 if (stat (path
, &st
) != 0)
3373 if (!S_ISDIR (st
.st_mode
))
3376 if (statfs (path
, &stfs
) != 0)
3378 if (stfs
.f_type
!= SPUFS_MAGIC
)
3381 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
3383 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
3393 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
3394 object type, using the /proc file system. */
3396 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
3397 unsigned const char *writebuf
,
3398 CORE_ADDR offset
, int len
)
3400 long pid
= lwpid_of (get_thread_lwp (current_inferior
));
3405 if (!writebuf
&& !readbuf
)
3413 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
3416 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
3417 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
3422 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
3429 ret
= write (fd
, writebuf
, (size_t) len
);
3431 ret
= read (fd
, readbuf
, (size_t) len
);
3438 linux_core_of_thread (ptid_t ptid
)
3440 char filename
[sizeof ("/proc//task//stat")
3441 + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */
3444 char *content
= NULL
;
3447 int content_read
= 0;
3451 sprintf (filename
, "/proc/%d/task/%ld/stat",
3452 ptid_get_pid (ptid
), ptid_get_lwp (ptid
));
3453 f
= fopen (filename
, "r");
3460 content
= realloc (content
, content_read
+ 1024);
3461 n
= fread (content
+ content_read
, 1, 1024, f
);
3465 content
[content_read
] = '\0';
3470 p
= strchr (content
, '(');
3471 p
= strchr (p
, ')') + 2; /* skip ")" and a whitespace. */
3473 p
= strtok_r (p
, " ", &ts
);
3474 for (i
= 0; i
!= 36; ++i
)
3475 p
= strtok_r (NULL
, " ", &ts
);
3477 if (sscanf (p
, "%d", &core
) == 0)
3486 static struct target_ops linux_target_ops
= {
3487 linux_create_inferior
,
3495 linux_fetch_registers
,
3496 linux_store_registers
,
3499 linux_look_up_symbols
,
3500 linux_request_interrupt
,
3504 linux_stopped_by_watchpoint
,
3505 linux_stopped_data_address
,
3506 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
3511 #ifdef USE_THREAD_DB
3512 thread_db_get_tls_address
,
3517 hostio_last_error_from_errno
,
3520 linux_supports_non_stop
,
3522 linux_start_non_stop
,
3523 linux_supports_multi_process
,
3524 #ifdef USE_THREAD_DB
3525 thread_db_handle_monitor_command
,
3529 linux_core_of_thread
3533 linux_init_signals ()
3535 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
3536 to find what the cancel signal actually is. */
3537 #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */
3538 signal (__SIGRTMIN
+1, SIG_IGN
);
3543 initialize_low (void)
3545 struct sigaction sigchld_action
;
3546 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
3547 set_target_ops (&linux_target_ops
);
3548 set_breakpoint_data (the_low_target
.breakpoint
,
3549 the_low_target
.breakpoint_len
);
3550 linux_init_signals ();
3551 linux_test_for_tracefork ();
3552 #ifdef HAVE_LINUX_REGSETS
3553 for (num_regsets
= 0; target_regsets
[num_regsets
].size
>= 0; num_regsets
++)
3555 disabled_regsets
= xmalloc (num_regsets
);
3558 sigchld_action
.sa_handler
= sigchld_handler
;
3559 sigemptyset (&sigchld_action
.sa_mask
);
3560 sigchld_action
.sa_flags
= SA_RESTART
;
3561 sigaction (SIGCHLD
, &sigchld_action
, NULL
);