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132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/* Copyright (C) 1994-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <mach/exc_server.h>
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#include <hurd/signal.h>
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#include <assert.h>
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/* Called by the microkernel when a thread gets an exception. */
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kern_return_t
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_S_catch_exception_raise (mach_port_t port,
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thread_t thread,
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task_t task,
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#ifdef EXC_MASK_ALL /* New interface flavor. */
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exception_type_t exception,
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exception_data_t code,
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mach_msg_type_number_t codeCnt
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#else /* Vanilla Mach 3.0 interface. */
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integer_t exception,
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integer_t code, integer_t subcode
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#endif
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)
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{
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struct hurd_sigstate *ss;
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int signo;
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struct hurd_signal_detail d;
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if (task != __mach_task_self ())
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/* The sender wasn't the kernel. */
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return EPERM;
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d.exc = exception;
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#ifdef EXC_MASK_ALL
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assert (codeCnt >= 2);
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d.exc_code = code[0];
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d.exc_subcode = code[1];
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#else
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d.exc_code = code;
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d.exc_subcode = subcode;
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#endif
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/* Call the machine-dependent function to translate the Mach exception
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codes into a signal number and subcode. */
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_hurd_exception2signal (&d, &signo);
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/* Find the sigstate structure for the faulting thread. */
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__mutex_lock (&_hurd_siglock);
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for (ss = _hurd_sigstates; ss != NULL; ss = ss->next)
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if (ss->thread == thread)
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break;
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__mutex_unlock (&_hurd_siglock);
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if (ss == NULL)
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ss = _hurd_thread_sigstate (thread); /* Allocate a fresh one. */
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if (__spin_lock_locked (&ss->lock))
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{
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/* Loser. The thread faulted with its sigstate lock held. Its
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sigstate data is now suspect. So we reset the parts of it which
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could cause trouble for the signal thread. Anything else
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clobbered therein will just hose this user thread, but it's
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faulting already.
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This is almost certainly a library bug: unless random memory
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clobberation caused the sigstate lock to gratuitously appear held,
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no code should do anything that can fault while holding the
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sigstate lock. */
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__spin_unlock (&ss->critical_section_lock);
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ss->context = NULL;
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__spin_unlock (&ss->lock);
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}
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/* Post the signal. */
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_hurd_internal_post_signal (ss, signo, &d,
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MACH_PORT_NULL, MACH_MSG_TYPE_PORT_SEND,
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0);
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return KERN_SUCCESS;
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}
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#ifdef EXC_MASK_ALL
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/* XXX New interface flavor has additional RPCs that we could be using
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instead. These RPCs roll a thread_get_state/thread_set_state into
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the message, so the signal thread ought to use these to save some calls.
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*/
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kern_return_t
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_S_catch_exception_raise_state (mach_port_t port,
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exception_type_t exception,
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exception_data_t code,
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mach_msg_type_number_t codeCnt,
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int *flavor,
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thread_state_t old_state,
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mach_msg_type_number_t old_stateCnt,
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thread_state_t new_state,
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mach_msg_type_number_t *new_stateCnt)
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{
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abort ();
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return KERN_FAILURE;
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}
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kern_return_t
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_S_catch_exception_raise_state_identity (mach_port_t exception_port,
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thread_t thread,
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task_t task,
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exception_type_t exception,
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exception_data_t code,
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mach_msg_type_number_t codeCnt,
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int *flavor,
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thread_state_t old_state,
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mach_msg_type_number_t old_stateCnt,
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thread_state_t new_state,
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mach_msg_type_number_t *new_stateCnt)
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{
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abort ();
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return KERN_FAILURE;
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}
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#endif
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