Beispiel #1
0
void
exception_try_task(
	integer_t _exception, 
	integer_t code, 
	integer_t subcode)
{
	ipc_thread_t self = current_thread();
	task_t task = self->task;
	ipc_port_t exc_port;

	/*
	 *	Optimized version of retrieve_task_exception.
	 */

	itk_lock(task);
	assert(task->itk_self != IP_NULL);
	exc_port = task->itk_exception;
	if (!IP_VALID(exc_port)) {
		itk_unlock(task);
		exception_no_server();
		/*NOTREACHED*/
	}

	ip_lock(exc_port);
	itk_unlock(task);
	if (!ip_active(exc_port)) {
		ip_unlock(exc_port);
		exception_no_server();
		/*NOTREACHED*/
	}

	/*
	 *	Make a naked send right for the exception port.
	 */

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

	/*
	 *	This is the thread's last chance.
	 *	Clear the saved exception state.
	 */

	self->ith_exc = KERN_SUCCESS;

	exception_raise(exc_port,
			retrieve_thread_self_fast(self),
			retrieve_task_self_fast(task),
			_exception, code, subcode);
	/*NOTREACHED*/
}
Beispiel #2
0
/*
 *	Routine:	exception_deliver
 *	Purpose:
 *		Make an upcall to the exception server provided.
 *	Conditions:
 *		Nothing locked and no resources held.
 *		Called from an exception context, so
 *		thread_exception_return and thread_kdb_return
 *		are possible.
 *	Returns:
 *		KERN_SUCCESS if the exception was handled
 */
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)
{
	ipc_port_t		exc_port;
	exception_data_type_t	small_code[EXCEPTION_CODE_MAX];
	int			code64;
	int			behavior;
	int			flavor;
	kern_return_t		kr;

	/*
	 *  Save work if we are terminating.
	 *  Just go back to our AST handler.
	 */
	if (!thread->active)
		return KERN_SUCCESS;

	/*
	 * 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.
	 */
	lck_mtx_lock(mutex);
	exc_port = excp->port;
	if (!IP_VALID(exc_port)) {
		lck_mtx_unlock(mutex);
		return KERN_FAILURE;
	}
	ip_lock(exc_port);
	if (!ip_active(exc_port)) {
		ip_unlock(exc_port);
		lck_mtx_unlock(mutex);
		return KERN_FAILURE;
	}
	ip_reference(exc_port);	
	exc_port->ip_srights++;
	ip_unlock(exc_port);

	flavor = excp->flavor;
	behavior = excp->behavior;
	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;
		thread_state_data_t state;

		c_thr_exc_raise_state++;
		state_cnt = _MachineStateCount[flavor];
		kr = thread_getstatus(thread, flavor, 
				      (thread_state_t)state,
				      &state_cnt);
		if (kr == KERN_SUCCESS) {
			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)
				kr = thread_setstatus(thread, flavor, 
						(thread_state_t)state,
						state_cnt);
		}

		return kr;
	}

	case EXCEPTION_DEFAULT:
		c_thr_exc_raise++;
		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);
		}

		return kr;

	case EXCEPTION_STATE_IDENTITY: {
		mach_msg_type_number_t state_cnt;
		thread_state_data_t state;

		c_thr_exc_raise_state_id++;
		state_cnt = _MachineStateCount[flavor];
		kr = thread_getstatus(thread, flavor,
				      (thread_state_t)state,
				      &state_cnt);
		if (kr == KERN_SUCCESS) {
			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);
		}

		return kr;
	}

	default:
	       panic ("bad exception behavior!");
	       return KERN_FAILURE; 
	}/* switch */
}