xnu-2050.24.15.tar.gz

[apple/xnu.git] / osfmk / kern / exception.c

diff --git a/osfmk/kern/exception.c b/osfmk/kern/exception.c
index b99139fc23c0c82077a1a2f3170a3d0c223d1a21..8df6e268bb0dc373e61ab82ca10ed34d5660efb6 100644 (file)
--- a/osfmk/kern/exception.c
+++ b/osfmk/kern/exception.c
@@ -1,23 +1,29 @@
 /*
 /*

- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.

  *
  *

- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  * 
  * 

- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.

  * 
  * 

- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER

  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.

  * 
  * 

- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /*
  * @OSF_COPYRIGHT@
  */
 /*
  * @OSF_COPYRIGHT@


@@ -50,15 +56,17 @@
 /*
  */
 
 /*
  */
 

-#include <mach_kdb.h>
-
+#include <mach/mach_types.h>

 #include <mach/boolean.h>
 #include <mach/kern_return.h>
 #include <mach/message.h>
 #include <mach/port.h>
 #include <mach/mig_errors.h>
 #include <mach/boolean.h>
 #include <mach/kern_return.h>
 #include <mach/message.h>
 #include <mach/port.h>
 #include <mach/mig_errors.h>

+#include <mach/task.h>

 #include <mach/thread_status.h>
 #include <mach/exception_types.h>
 #include <mach/thread_status.h>
 #include <mach/exception_types.h>

+#include <mach/exc.h>
+#include <mach/mach_exc.h>

 #include <ipc/port.h>
 #include <ipc/ipc_entry.h>
 #include <ipc/ipc_object.h>
 #include <ipc/port.h>
 #include <ipc/ipc_entry.h>
 #include <ipc/ipc_object.h>


@@ -66,35 +74,17 @@
 #include <ipc/ipc_space.h>
 #include <ipc/ipc_pset.h>
 #include <ipc/ipc_machdep.h>
 #include <ipc/ipc_space.h>
 #include <ipc/ipc_pset.h>
 #include <ipc/ipc_machdep.h>

-#include <kern/etap_macros.h>

 #include <kern/counters.h>
 #include <kern/ipc_tt.h>
 #include <kern/task.h>
 #include <kern/thread.h>
 #include <kern/counters.h>
 #include <kern/ipc_tt.h>
 #include <kern/task.h>
 #include <kern/thread.h>

-#include <kern/thread_swap.h>

 #include <kern/processor.h>
 #include <kern/sched.h>
 #include <kern/sched_prim.h>
 #include <kern/host.h>
 #include <kern/misc_protos.h>
 #include <string.h>
 #include <kern/processor.h>
 #include <kern/sched.h>
 #include <kern/sched_prim.h>
 #include <kern/host.h>
 #include <kern/misc_protos.h>
 #include <string.h>

-#include <mach/exc.h>
-
-#if    MACH_KDB
-#include <ddb/db_trap.h>
-#endif /* MACH_KDB */
-
-#if    MACH_KDB
-
-#include <ddb/db_output.h>
-
-#if iPSC386 || iPSC860
-boolean_t debug_user_with_kdb = TRUE;
-#else
-boolean_t debug_user_with_kdb = FALSE;
-#endif
-
-#endif /* MACH_KDB */
+#include <pexpert/pexpert.h>

 
 unsigned long c_thr_exc_raise = 0;
 unsigned long c_thr_exc_raise_state = 0;
 
 unsigned long c_thr_exc_raise = 0;
 unsigned long c_thr_exc_raise_state = 0;


@@ -103,6 +93,21 @@ unsigned long c_tsk_exc_raise = 0;
 unsigned long c_tsk_exc_raise_state = 0;
 unsigned long c_tsk_exc_raise_state_id = 0;
 
 unsigned long c_tsk_exc_raise_state = 0;
 unsigned long c_tsk_exc_raise_state_id = 0;
 

+/* forward declarations */
+kern_return_t exception_deliver(
+       thread_t                thread,
+       exception_type_t        exception,
+       mach_exception_data_t   code,
+       mach_msg_type_number_t  codeCnt,
+       struct exception_action *excp,
+       lck_mtx_t                       *mutex);
+
+#ifdef MACH_BSD
+kern_return_t bsd_exception(
+       exception_type_t        exception,
+       mach_exception_data_t   code,
+       mach_msg_type_number_t  codeCnt);
+#endif /* MACH_BSD */

 
 /*
  *     Routine:        exception_deliver
 
 /*
  *     Routine:        exception_deliver


@@ -114,18 +119,20 @@ unsigned long c_tsk_exc_raise_state_id = 0;
  *             thread_exception_return and thread_kdb_return
  *             are possible.
  *     Returns:
  *             thread_exception_return and thread_kdb_return
  *             are possible.
  *     Returns:

- *             If the exception was not handled by this handler
+ *             KERN_SUCCESS if the exception was handled

  */
  */

-void
+kern_return_t 

 exception_deliver(
 exception_deliver(

+       thread_t                thread,

        exception_type_t        exception,
        exception_type_t        exception,

-       exception_data_t        code,
+       mach_exception_data_t   code,

        mach_msg_type_number_t  codeCnt,
        struct exception_action *excp,
        mach_msg_type_number_t  codeCnt,
        struct exception_action *excp,

-       mutex_t                 *mutex)
+       lck_mtx_t                       *mutex)

 {
 {

-       thread_act_t            a_self = current_act();

        ipc_port_t              exc_port;
        ipc_port_t              exc_port;

+       exception_data_type_t   small_code[EXCEPTION_CODE_MAX];
+       int                     code64;

        int                     behavior;
        int                     flavor;
        kern_return_t           kr;
        int                     behavior;
        int                     flavor;
        kern_return_t           kr;


@@ -134,8 +141,8 @@ exception_deliver(
         *  Save work if we are terminating.
         *  Just go back to our AST handler.
         */
         *  Save work if we are terminating.
         *  Just go back to our AST handler.
         */

-       if (!a_self->active)
-               thread_exception_return();
+       if (!thread->active)
+               return KERN_SUCCESS;

 
        /*
         * Snapshot the exception action data under lock for consistency.
 
        /*
         * Snapshot the exception action data under lock for consistency.


@@ -144,17 +151,17 @@ exception_deliver(
         * the port from disappearing between now and when
         * ipc_object_copyin_from_kernel is finally called.
         */
         * the port from disappearing between now and when
         * ipc_object_copyin_from_kernel is finally called.
         */

-       mutex_lock(mutex);
+       lck_mtx_lock(mutex);

        exc_port = excp->port;
        if (!IP_VALID(exc_port)) {
        exc_port = excp->port;
        if (!IP_VALID(exc_port)) {

-               mutex_unlock(mutex);
-               return;
+               lck_mtx_unlock(mutex);
+               return KERN_FAILURE;

        }
        ip_lock(exc_port);
        if (!ip_active(exc_port)) {
                ip_unlock(exc_port);
        }
        ip_lock(exc_port);
        if (!ip_active(exc_port)) {
                ip_unlock(exc_port);

-               mutex_unlock(mutex);
-               return;
+               lck_mtx_unlock(mutex);
+               return KERN_FAILURE;

        }
        ip_reference(exc_port); 
        exc_port->ip_srights++;
        }
        ip_reference(exc_port); 
        exc_port->ip_srights++;


@@ -162,81 +169,117 @@ exception_deliver(
 
        flavor = excp->flavor;
        behavior = excp->behavior;
 
        flavor = excp->flavor;
        behavior = excp->behavior;

-       mutex_unlock(mutex);
+       lck_mtx_unlock(mutex);
+
+       code64 = (behavior & MACH_EXCEPTION_CODES);
+       behavior &= ~MACH_EXCEPTION_CODES;
+
+       if (!code64) {
+               small_code[0] = CAST_DOWN_EXPLICIT(exception_data_type_t, code[0]);
+               small_code[1] = CAST_DOWN_EXPLICIT(exception_data_type_t, code[1]);
+       }
+

 
        switch (behavior) {
        case EXCEPTION_STATE: {
                mach_msg_type_number_t state_cnt;
 
        switch (behavior) {
        case EXCEPTION_STATE: {
                mach_msg_type_number_t state_cnt;

-               natural_t state[ THREAD_MACHINE_STATE_MAX ];
+               thread_state_data_t state;

 
                c_thr_exc_raise_state++;
 
                c_thr_exc_raise_state++;

-               state_cnt = state_count[flavor];
-               kr = thread_getstatus(a_self, flavor, 
+               state_cnt = _MachineStateCount[flavor];
+               kr = thread_getstatus(thread, flavor, 

                                      (thread_state_t)state,
                                      &state_cnt);
                if (kr == KERN_SUCCESS) {
                                      (thread_state_t)state,
                                      &state_cnt);
                if (kr == KERN_SUCCESS) {

-                       kr = exception_raise_state(exc_port, exception,
-                                                  code, codeCnt,
-                                                  &flavor,
-                                                  state, state_cnt,
-                                                  state, &state_cnt);
+                       if (code64) {
+                               kr = mach_exception_raise_state(exc_port, 
+                                               exception,
+                                               code, 
+                                               codeCnt,
+                                               &flavor,
+                                               state, state_cnt,
+                                               state, &state_cnt);
+                       } else {
+                               kr = exception_raise_state(exc_port, exception,
+                                               small_code, 
+                                               codeCnt,
+                                               &flavor,
+                                               state, state_cnt,
+                                               state, &state_cnt);
+                       }

                        if (kr == MACH_MSG_SUCCESS)
                        if (kr == MACH_MSG_SUCCESS)

-                               kr = thread_setstatus(a_self, flavor, 
-                                                     (thread_state_t)state,
-                                                     state_cnt);
+                               kr = thread_setstatus(thread, flavor, 
+                                               (thread_state_t)state,
+                                               state_cnt);

                }
 
                }
 

-               if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
-                       thread_exception_return();
-                       /*NOTREACHED*/
-               return;
+               return kr;

        }
 
        case EXCEPTION_DEFAULT:
                c_thr_exc_raise++;
        }
 
        case EXCEPTION_DEFAULT:
                c_thr_exc_raise++;

-               kr = exception_raise(exc_port,
-                               retrieve_act_self_fast(a_self),
-                               retrieve_task_self_fast(a_self->task),
-                               exception,
-                               code, codeCnt);
+               if (code64) {
+                       kr = mach_exception_raise(exc_port,
+                                       retrieve_thread_self_fast(thread),
+                                       retrieve_task_self_fast(thread->task),
+                                       exception,
+                                       code, 
+                                       codeCnt);
+               } else {
+                       kr = exception_raise(exc_port,
+                                       retrieve_thread_self_fast(thread),
+                                       retrieve_task_self_fast(thread->task),
+                                       exception,
+                                       small_code, 
+                                       codeCnt);
+               }

 
 

-               if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
-                       thread_exception_return();
-                       /*NOTREACHED*/
-               return;
+               return kr;

 
        case EXCEPTION_STATE_IDENTITY: {
                mach_msg_type_number_t state_cnt;
 
        case EXCEPTION_STATE_IDENTITY: {
                mach_msg_type_number_t state_cnt;

-               natural_t state[ THREAD_MACHINE_STATE_MAX ];
+               thread_state_data_t state;

 
                c_thr_exc_raise_state_id++;
 
                c_thr_exc_raise_state_id++;

-               state_cnt = state_count[flavor];
-               kr = thread_getstatus(a_self, flavor,
+               state_cnt = _MachineStateCount[flavor];
+               kr = thread_getstatus(thread, flavor,

                                      (thread_state_t)state,
                                      &state_cnt);
                if (kr == KERN_SUCCESS) {
                                      (thread_state_t)state,
                                      &state_cnt);
                if (kr == KERN_SUCCESS) {

-                   kr = exception_raise_state_identity(exc_port,
-                               retrieve_act_self_fast(a_self),
-                               retrieve_task_self_fast(a_self->task),
-                               exception,
-                               code, codeCnt,
-                               &flavor,
-                               state, state_cnt,
-                               state, &state_cnt);
-                   if (kr == MACH_MSG_SUCCESS)
-                       kr = thread_setstatus(a_self, flavor,
-                                             (thread_state_t)state,
-                                             state_cnt);
+                       if (code64) {
+                               kr = mach_exception_raise_state_identity(
+                                               exc_port,
+                                               retrieve_thread_self_fast(thread),
+                                               retrieve_task_self_fast(thread->task),
+                                               exception,
+                                               code, 
+                                               codeCnt,
+                                               &flavor,
+                                               state, state_cnt,
+                                               state, &state_cnt);
+                       } else {
+                               kr = exception_raise_state_identity(exc_port,
+                                               retrieve_thread_self_fast(thread),
+                                               retrieve_task_self_fast(thread->task),
+                                               exception,
+                                               small_code, 
+                                               codeCnt,
+                                               &flavor,
+                                               state, state_cnt,
+                                               state, &state_cnt);
+                       }
+                       if (kr == MACH_MSG_SUCCESS)
+                               kr = thread_setstatus(thread, flavor,
+                                               (thread_state_t)state,
+                                               state_cnt);

                }
 
                }
 

-               if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
-                       thread_exception_return();
-                       /*NOTREACHED*/
-               return;
+               return kr;

        }
        }

-       
+

        default:
        default:

-               panic ("bad exception behavior!");
+              panic ("bad exception behavior!");
+              return KERN_FAILURE; 

        }/* switch */
 }
 
        }/* switch */
 }
 


@@ -254,198 +297,149 @@ exception_deliver(
  *             Doesn't return.
  */
 void
  *             Doesn't return.
  */
 void

-exception(
+exception_triage(

        exception_type_t        exception,
        exception_type_t        exception,

-       exception_data_t        code,
+       mach_exception_data_t   code,

        mach_msg_type_number_t  codeCnt)
 {
        mach_msg_type_number_t  codeCnt)
 {

-       thread_act_t            thr_act;
+       thread_t                thread;

        task_t                  task;
        host_priv_t             host_priv;
        struct exception_action *excp;
        task_t                  task;
        host_priv_t             host_priv;
        struct exception_action *excp;

-       mutex_t                 *mutex;
+       lck_mtx_t                       *mutex;
+       kern_return_t           kr;

 
        assert(exception != EXC_RPC_ALERT);
 
 
        assert(exception != EXC_RPC_ALERT);
 

-       if (exception == KERN_SUCCESS)
-               panic("exception");
+       thread = current_thread();

 
        /*
         * Try to raise the exception at the activation level.
         */
 
        /*
         * Try to raise the exception at the activation level.
         */

-       thr_act = current_act();
-       mutex = mutex_addr(thr_act->lock);
-       excp = &thr_act->exc_actions[exception];
-       exception_deliver(exception, code, codeCnt, excp, mutex);
+       mutex = &thread->mutex;
+       excp = &thread->exc_actions[exception];
+       kr = exception_deliver(thread, exception, code, codeCnt, excp, mutex);
+       if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
+               goto out;

 
        /*
         * Maybe the task level will handle it.
         */
        task = current_task();
 
        /*
         * Maybe the task level will handle it.
         */
        task = current_task();

-       mutex = mutex_addr(task->lock);
+       mutex = &task->lock;

        excp = &task->exc_actions[exception];
        excp = &task->exc_actions[exception];

-       exception_deliver(exception, code, codeCnt, excp, mutex);
+       kr = exception_deliver(thread, exception, code, codeCnt, excp, mutex);
+       if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
+               goto out;

 
        /*
         * How about at the host level?
         */
        host_priv = host_priv_self();
 
        /*
         * How about at the host level?
         */
        host_priv = host_priv_self();

-       mutex = mutex_addr(host_priv->lock);
+       mutex = &host_priv->lock;

        excp = &host_priv->exc_actions[exception];
        excp = &host_priv->exc_actions[exception];

-       exception_deliver(exception, code, codeCnt, excp, mutex);
+       kr = exception_deliver(thread, exception, code, codeCnt, excp, mutex);
+       if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
+               goto out;

 
        /*
         * Nobody handled it, terminate the task.
         */
 
 
        /*
         * Nobody handled it, terminate the task.
         */
 

-#if    MACH_KDB
-       if (debug_user_with_kdb) {
-               /*
-                *      Debug the exception with kdb.
-                *      If kdb handles the exception,
-                *      then thread_kdb_return won't return.
-                */
-               db_printf("No exception server, calling kdb...\n");
-               thread_kdb_return();
-       }
-#endif /* MACH_KDB */
-

        (void) task_terminate(task);
        (void) task_terminate(task);

-       thread_exception_return();
-       /*NOTREACHED*/
+
+out:
+       if ((exception != EXC_CRASH) && (exception != EXC_RESOURCE))
+               thread_exception_return();
+       return;

 }
 
 kern_return_t
 bsd_exception(
        exception_type_t        exception,
 }
 
 kern_return_t
 bsd_exception(
        exception_type_t        exception,

-       exception_data_t        code,
+       mach_exception_data_t   code,

        mach_msg_type_number_t  codeCnt)
 {
        task_t                  task;
        mach_msg_type_number_t  codeCnt)
 {
        task_t                  task;

-       host_priv_t             host_priv;

        struct exception_action *excp;
        struct exception_action *excp;

-       mutex_t                 *mutex;
-       thread_act_t            a_self = current_act();
-       ipc_port_t              exc_port;
-       int                     behavior;
-       int                     flavor;
+       lck_mtx_t               *mutex;
+       thread_t                self = current_thread();

        kern_return_t           kr;
 
        /*
         * Maybe the task level will handle it.
         */
        task = current_task();
        kern_return_t           kr;
 
        /*
         * Maybe the task level will handle it.
         */
        task = current_task();

-       mutex = mutex_addr(task->lock);
+       mutex = &task->lock;

        excp = &task->exc_actions[exception];
 
        excp = &task->exc_actions[exception];
 

-       /*
-        *  Save work if we are terminating.
-        *  Just go back to our AST handler.
-        */
-       if (!a_self->active) {
-               return(KERN_FAILURE);
-       }
+       kr = exception_deliver(self, exception, code, codeCnt, excp, mutex);

 
 

-       /*
-        * Snapshot the exception action data under lock for consistency.
-        * Hold a reference to the port over the exception_raise_* calls
-        * so it can't be destroyed.  This seems like overkill, but keeps
-        * the port from disappearing between now and when
-        * ipc_object_copyin_from_kernel is finally called.
-        */
-       mutex_lock(mutex);
-       exc_port = excp->port;
-       if (!IP_VALID(exc_port)) {
-               mutex_unlock(mutex);
-               return(KERN_FAILURE);
-       }
-       ip_lock(exc_port);
-       if (!ip_active(exc_port)) {
-               ip_unlock(exc_port);
-               mutex_unlock(mutex);
-               return(KERN_FAILURE);
-       }
-       ip_reference(exc_port); 
-       exc_port->ip_srights++;
-       ip_unlock(exc_port);
+       if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
+               return(KERN_SUCCESS);
+       return(KERN_FAILURE);
+}

 
 

-       flavor = excp->flavor;
-       behavior = excp->behavior;
-       mutex_unlock(mutex);

 
 

-       switch (behavior) {
-       case EXCEPTION_STATE: {
-               mach_msg_type_number_t state_cnt;
-               natural_t state[ THREAD_MACHINE_STATE_MAX ];
+/*
+ * Raise an exception on a task.
+ * This should tell launchd to launch Crash Reporter for this task.
+ */
+kern_return_t task_exception_notify(exception_type_t exception,
+       mach_exception_data_type_t exccode, mach_exception_data_type_t excsubcode)
+{
+       mach_exception_data_type_t      code[EXCEPTION_CODE_MAX];
+       wait_interrupt_t                wsave;

 
 

-               c_thr_exc_raise_state++;
-               state_cnt = state_count[flavor];
-               kr = thread_getstatus(a_self, flavor, 
-                                     (thread_state_t)state,
-                                     &state_cnt);
-               if (kr == KERN_SUCCESS) {
-                       kr = exception_raise_state(exc_port, exception,
-                                                  code, codeCnt,
-                                                  &flavor,
-                                                  state, state_cnt,
-                                                  state, &state_cnt);
-                       if (kr == MACH_MSG_SUCCESS)
-                               kr = thread_setstatus(a_self, flavor, 
-                                                     (thread_state_t)state,
-                                                     state_cnt);
-               }
+       code[0] = exccode;
+       code[1] = excsubcode;

 
 

-               if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
-                       return(KERN_SUCCESS);
+       wsave = thread_interrupt_level(THREAD_UNINT);
+       exception_triage(exception, code, EXCEPTION_CODE_MAX);
+       (void) thread_interrupt_level(wsave);
+       return (KERN_SUCCESS);
+}

 
 

-               return(KERN_FAILURE);
-       }

 
 

-       case EXCEPTION_DEFAULT:
-               c_thr_exc_raise++;
-               kr = exception_raise(exc_port,
-                               retrieve_act_self_fast(a_self),
-                               retrieve_task_self_fast(a_self->task),
-                               exception,
-                               code, codeCnt);
+/*
+ *     Handle interface for special performance monitoring
+ *     This is a special case of the host exception handler
+ */
+kern_return_t sys_perf_notify(thread_t thread, int pid) 
+{
+       host_priv_t             hostp;
+       struct exception_action *excp;
+       ipc_port_t              xport;
+       wait_interrupt_t        wsave;
+       kern_return_t           ret;

 
 

-               if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
-                       return(KERN_SUCCESS);
-               return(KERN_FAILURE);
+       hostp = host_priv_self();       /* Get the host privileged ports */
+       mach_exception_data_type_t      code[EXCEPTION_CODE_MAX];
+       code[0] = 0xFF000001;           /* Set terminate code */
+       code[1] = pid;          /* Pass out the pid */

 
 

-       case EXCEPTION_STATE_IDENTITY: {
-               mach_msg_type_number_t state_cnt;
-               natural_t state[ THREAD_MACHINE_STATE_MAX ];
+       struct task *task = thread->task;
+       excp = &hostp->exc_actions[EXC_RPC_ALERT];      
+       xport = excp->port;     

 
 

-               c_thr_exc_raise_state_id++;
-               state_cnt = state_count[flavor];
-               kr = thread_getstatus(a_self, flavor,
-                                     (thread_state_t)state,
-                                     &state_cnt);
-               if (kr == KERN_SUCCESS) {
-                   kr = exception_raise_state_identity(exc_port,
-                               retrieve_act_self_fast(a_self),
-                               retrieve_task_self_fast(a_self->task),
-                               exception,
-                               code, codeCnt,
-                               &flavor,
-                               state, state_cnt,
-                               state, &state_cnt);
-                   if (kr == MACH_MSG_SUCCESS)
-                       kr = thread_setstatus(a_self, flavor,
-                                             (thread_state_t)state,
-                                             state_cnt);
-               }
+       /* Make sure we're not catching our own exception */
+       if (!IP_VALID(xport) ||
+                       !ip_active(xport) ||
+                       task->itk_space == xport->data.receiver) {

 
 

-               if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
-                       return(KERN_SUCCESS);
-               return(KERN_FAILURE);
+               return(KERN_FAILURE);   

        }
        }

-       
-       default:
-               
-               return(KERN_FAILURE);
-       }/* switch */
-       return(KERN_FAILURE);
+
+       wsave = thread_interrupt_level(THREAD_UNINT);   
+       ret = exception_deliver(
+                       thread,
+                       EXC_RPC_ALERT, 
+                       code, 
+                       2, 
+                       excp,
+                       &hostp->lock);
+       (void)thread_interrupt_level(wsave);
+
+       return(ret);

 }
 
 }