git://sourceware.org / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| c84142e8 UD |
1 | /* Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. | |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| c84142e8 UD |
8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 12 | Lesser General Public License for more details. |
| c84142e8 | 13 | |
| 41bdb6e2 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, write to the Free | |
| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 17 | 02111-1307 USA. */ | |
| 28f540f4 RM |
18 | |
| 19 | #include <mach/exc_server.h> | |
| 20 | #include <hurd/signal.h> | |
| 21 | ||
| 22 | /* Called by the microkernel when a thread gets an exception. */ | |
| 23 | ||
| 24 | kern_return_t | |
| 25 | _S_catch_exception_raise (mach_port_t port, | |
| 26 | thread_t thread, | |
| 27 | task_t task, | |
| 28 | int exception, | |
| 29 | int code, | |
| 30 | int subcode) | |
| 31 | { | |
| 28f540f4 | 32 | struct hurd_sigstate *ss; |
| 0e3426bb RM |
33 | int signo; |
| 34 | struct hurd_signal_detail d; | |
| 28f540f4 RM |
35 | |
| 36 | if (task != __mach_task_self ()) | |
| 37 | /* The sender wasn't the kernel. */ | |
| 38 | return EPERM; | |
| 39 | ||
| 0e3426bb RM |
40 | d.exc = exception; |
| 41 | d.exc_code = code; | |
| 42 | d.exc_subcode = subcode; | |
| 43 | ||
| 28f540f4 RM |
44 | /* Call the machine-dependent function to translate the Mach exception |
| 45 | codes into a signal number and subcode. */ | |
| 0e3426bb | 46 | _hurd_exception2signal (&d, &signo); |
| 28f540f4 RM |
47 | |
| 48 | /* Find the sigstate structure for the faulting thread. */ | |
| 49 | __mutex_lock (&_hurd_siglock); | |
| 50 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
| 51 | if (ss->thread == thread) | |
| 52 | break; | |
| 53 | __mutex_unlock (&_hurd_siglock); | |
| 54 | if (ss == NULL) | |
| 55 | ss = _hurd_thread_sigstate (thread); /* Allocate a fresh one. */ | |
| 56 | ||
| 57 | if (__spin_lock_locked (&ss->lock)) | |
| 58 | { | |
| 59 | /* Loser. The thread faulted with its sigstate lock held. Its | |
| 60 | sigstate data is now suspect. So we reset the parts of it which | |
| 61 | could cause trouble for the signal thread. Anything else | |
| 62 | clobbered therein will just hose this user thread, but it's | |
| 63 | faulting already. | |
| 64 | ||
| 65 | This is almost certainly a library bug: unless random memory | |
| 66 | clobberation caused the sigstate lock to gratuitously appear held, | |
| 67 | no code should do anything that can fault while holding the | |
| 68 | sigstate lock. */ | |
| 69 | ||
| 8f0c527e | 70 | __spin_unlock (&ss->critical_section_lock); |
| 28f540f4 RM |
71 | ss->context = NULL; |
| 72 | __spin_unlock (&ss->lock); | |
| 73 | } | |
| 74 | ||
| 75 | /* Post the signal. */ | |
| 0e3426bb | 76 | _hurd_internal_post_signal (ss, signo, &d, |
| 28f540f4 RM |
77 | MACH_PORT_NULL, MACH_MSG_TYPE_PORT_SEND, |
| 78 | 0); | |
| 79 | ||
| 80 | return KERN_SUCCESS; | |
| 81 | } |