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glibc/hurd/catch-exc.c
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/* Copyright (C) 1994-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <mach/exc_server.h> | |
#include <hurd/signal.h> | |
#include <assert.h> | |
/* Called by the microkernel when a thread gets an exception. */ | |
kern_return_t | |
_S_catch_exception_raise (mach_port_t port, | |
thread_t thread, | |
task_t task, | |
#ifdef EXC_MASK_ALL /* New interface flavor. */ | |
exception_type_t exception, | |
exception_data_t code, | |
mach_msg_type_number_t codeCnt | |
#else /* Vanilla Mach 3.0 interface. */ | |
integer_t exception, | |
integer_t code, integer_t subcode | |
#endif | |
) | |
{ | |
struct hurd_sigstate *ss; | |
int signo; | |
struct hurd_signal_detail d; | |
if (task != __mach_task_self ()) | |
/* The sender wasn't the kernel. */ | |
return EPERM; | |
d.exc = exception; | |
#ifdef EXC_MASK_ALL | |
assert (codeCnt >= 2); | |
d.exc_code = code[0]; | |
d.exc_subcode = code[1]; | |
#else | |
d.exc_code = code; | |
d.exc_subcode = subcode; | |
#endif | |
/* Call the machine-dependent function to translate the Mach exception | |
codes into a signal number and subcode. */ | |
_hurd_exception2signal (&d, &signo); | |
/* Find the sigstate structure for the faulting thread. */ | |
__mutex_lock (&_hurd_siglock); | |
for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
if (ss->thread == thread) | |
break; | |
__mutex_unlock (&_hurd_siglock); | |
if (ss == NULL) | |
ss = _hurd_thread_sigstate (thread); /* Allocate a fresh one. */ | |
if (__spin_lock_locked (&ss->lock)) | |
{ | |
/* Loser. The thread faulted with its sigstate lock held. Its | |
sigstate data is now suspect. So we reset the parts of it which | |
could cause trouble for the signal thread. Anything else | |
clobbered therein will just hose this user thread, but it's | |
faulting already. | |
This is almost certainly a library bug: unless random memory | |
clobberation caused the sigstate lock to gratuitously appear held, | |
no code should do anything that can fault while holding the | |
sigstate lock. */ | |
__spin_unlock (&ss->critical_section_lock); | |
ss->context = NULL; | |
__spin_unlock (&ss->lock); | |
} | |
/* Post the signal. */ | |
_hurd_internal_post_signal (ss, signo, &d, | |
MACH_PORT_NULL, MACH_MSG_TYPE_PORT_SEND, | |
0); | |
return KERN_SUCCESS; | |
} | |
#ifdef EXC_MASK_ALL | |
/* XXX New interface flavor has additional RPCs that we could be using | |
instead. These RPCs roll a thread_get_state/thread_set_state into | |
the message, so the signal thread ought to use these to save some calls. | |
*/ | |
kern_return_t | |
_S_catch_exception_raise_state (mach_port_t port, | |
exception_type_t exception, | |
exception_data_t code, | |
mach_msg_type_number_t codeCnt, | |
int *flavor, | |
thread_state_t old_state, | |
mach_msg_type_number_t old_stateCnt, | |
thread_state_t new_state, | |
mach_msg_type_number_t *new_stateCnt) | |
{ | |
abort (); | |
return KERN_FAILURE; | |
} | |
kern_return_t | |
_S_catch_exception_raise_state_identity (mach_port_t exception_port, | |
thread_t thread, | |
task_t task, | |
exception_type_t exception, | |
exception_data_t code, | |
mach_msg_type_number_t codeCnt, | |
int *flavor, | |
thread_state_t old_state, | |
mach_msg_type_number_t old_stateCnt, | |
thread_state_t new_state, | |
mach_msg_type_number_t *new_stateCnt) | |
{ | |
abort (); | |
return KERN_FAILURE; | |
} | |
#endif |