[apple/xnu.git] / bsd / uxkern / ux_exception.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_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 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,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1987 Carnegie-Mellon University
 * All rights reserved.  The CMU software License Agreement specifies
 * the terms and conditions for use and redistribution.
 */

/*
 *********************************************************************
 * HISTORY
 **********************************************************************
 */

#include <sys/param.h>

#include <mach/boolean.h>
#include <mach/exception.h>
#include <mach/kern_return.h>
#include <mach/message.h>
#include <mach/port.h>
#include <mach/mig_errors.h>
#include <kern/task.h>
#include <kern/thread.h>
#include <kern/thread_act.h>
#include <kern/kalloc.h>

#include <sys/proc.h>
#include <sys/user.h>
#include <sys/systm.h>
#include <sys/ux_exception.h>

/*
 *	Unix exception handler.
 */

static void	ux_exception();

decl_simple_lock_data(static,	ux_handler_init_lock)
mach_port_name_t		ux_exception_port;
static task_t			ux_handler_self;

static
void
ux_handler(void)
{
    task_t		self = current_task();
    mach_port_name_t	exc_port_name;
    mach_port_name_t	exc_set_name;

    (void) thread_funnel_set(kernel_flock, TRUE);

    /* self->kernel_vm_space = TRUE; */
    ux_handler_self = self;


    /*
     *	Allocate a port set that we will receive on.
     */
    if (mach_port_allocate(get_task_ipcspace(ux_handler_self), MACH_PORT_RIGHT_PORT_SET,  &exc_set_name) != MACH_MSG_SUCCESS)
	    panic("ux_handler: port_set_allocate failed");

    /*
     *	Allocate an exception port and use object_copyin to
     *	translate it to the global name.  Put it into the set.
     */
    if (mach_port_allocate(get_task_ipcspace(ux_handler_self), MACH_PORT_RIGHT_RECEIVE, &exc_port_name) != MACH_MSG_SUCCESS)
	panic("ux_handler: port_allocate failed");
    if (mach_port_move_member(get_task_ipcspace(ux_handler_self),
    			exc_port_name,  exc_set_name) != MACH_MSG_SUCCESS)
	panic("ux_handler: port_set_add failed");

    if (ipc_object_copyin(get_task_ipcspace(self), exc_port_name,
			MACH_MSG_TYPE_MAKE_SEND, 
			(void *) &ux_exception_port) != MACH_MSG_SUCCESS)
		panic("ux_handler: object_copyin(ux_exception_port) failed");

    thread_wakeup(&ux_exception_port);

    /* Message handling loop. */

    for (;;) {
	struct rep_msg {
		mach_msg_header_t Head;
		NDR_record_t NDR;
		kern_return_t RetCode;
	} rep_msg;
	struct exc_msg {
		mach_msg_header_t Head;
		/* start of the kernel processed data */
		mach_msg_body_t msgh_body;
		mach_msg_port_descriptor_t thread;
		mach_msg_port_descriptor_t task;
		/* end of the kernel processed data */
		NDR_record_t NDR;
		exception_type_t exception;
		mach_msg_type_number_t codeCnt;
		exception_data_t code;
		/* some times RCV_TO_LARGE probs */
		char pad[512];
	} exc_msg;
	mach_port_name_t	reply_port;
	kern_return_t	 result;

	exc_msg.Head.msgh_local_port = (mach_port_t)exc_set_name;
	exc_msg.Head.msgh_size = sizeof (exc_msg);
#if 0
	result = mach_msg_receive(&exc_msg.Head);
#else
	result = mach_msg_receive(&exc_msg.Head, MACH_RCV_MSG,
			     sizeof (exc_msg), exc_set_name,
			     MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL,
			     0);
#endif
	if (result == MACH_MSG_SUCCESS) {
	    reply_port = (mach_port_name_t)exc_msg.Head.msgh_remote_port;

	    if (exc_server(&exc_msg.Head, &rep_msg.Head))
		(void) mach_msg_send(&rep_msg.Head, MACH_SEND_MSG,
			sizeof (rep_msg),MACH_MSG_TIMEOUT_NONE,MACH_PORT_NULL);

	    if (reply_port != MACH_PORT_NULL)
		(void) mach_port_deallocate(get_task_ipcspace(ux_handler_self), reply_port);
	}
	else if (result == MACH_RCV_TOO_LARGE)
		/* ignore oversized messages */;
	else
		panic("exception_handler");
    }
	thread_funnel_set(kernel_flock, FALSE);
}

void
ux_handler_init(void)
{
	task_t	handler_task;

	simple_lock_init(&ux_handler_init_lock);
	ux_exception_port = MACH_PORT_NULL;
	if (kernel_task_create(kernel_task, 
		0, 0, &handler_task) != MACH_MSG_SUCCESS) {
		panic("Failed to created ux handler task\n");
	}
	(void) kernel_thread(handler_task, ux_handler);
	simple_lock(&ux_handler_init_lock);
	if (ux_exception_port == MACH_PORT_NULL)  {
		simple_unlock(&ux_handler_init_lock);
		assert_wait(&ux_exception_port, THREAD_UNINT);
		thread_block((void (*)(void)) 0);
		}
	else
		simple_unlock(&ux_handler_init_lock);
}

kern_return_t
catch_exception_raise(
    mach_port_name_t	exception_port,
    mach_port_name_t	thread_name,
    mach_port_name_t	task_name,
    int			exception,
    exception_data_t   	code,
    mach_msg_type_number_t	codecnt
)
{
	task_t		self = current_task();
	thread_act_t	th_act;
	ipc_port_t 	thread_port;
	ipc_port_t 	task_port;
	kern_return_t	result = MACH_MSG_SUCCESS;
	int			signal = 0;
	u_long		ucode = 0;
	struct uthread *ut;

   /*
     *	Convert local thread name to global port.
     */
   if (MACH_PORT_VALID(thread_name) &&
       (ipc_object_copyin(get_task_ipcspace(self), thread_name,
		       MACH_MSG_TYPE_PORT_SEND,
		       (void *) &thread_port) == MACH_MSG_SUCCESS)) {
        if (IPC_OBJECT_VALID(thread_port)) {
	   th_act = (thread_act_t)convert_port_to_act(thread_port);
	   ipc_port_release(thread_port);
	} else {
	   th_act = THR_ACT_NULL;
	}

	/*
	 *	Catch bogus ports
	 */
	if (th_act != THR_ACT_NULL) {
  
	    /*
	     *	Convert exception to unix signal and code.
	     */
		ut = get_bsdthread_info(th_act);
	    ux_exception(exception, code[0], code[1],
	    			&signal, &ucode);

	    /*
	     *	Send signal.
	     */
	    if (signal != 0)
		threadsignal(th_act, signal, ucode);

	    act_deallocate(th_act);
	}
	else
	    result = KERN_INVALID_ARGUMENT;
    }
    else
    	result = KERN_INVALID_ARGUMENT;

    /*
     *	Delete our send rights to the task and thread ports.
     */
    (void)mach_port_deallocate(get_task_ipcspace(ux_handler_self), task_name);
    (void)mach_port_deallocate(get_task_ipcspace(ux_handler_self),thread_name);

    return (result);
}
kern_return_t
catch_exception_raise_state(mach_port_name_t exception_port, int exception, exception_data_t code, mach_msg_type_number_t codeCnt, int flavor, thread_state_t old_state, int old_stateCnt, thread_state_t new_state, int new_stateCnt)
{
	return(KERN_INVALID_ARGUMENT);
}
kern_return_t
catch_exception_raise_state_identity(mach_port_name_t exception_port, mach_port_t thread, mach_port_t task, int exception, exception_data_t code, mach_msg_type_number_t codeCnt, int flavor, thread_state_t old_state, int old_stateCnt, thread_state_t new_state, int new_stateCnt)
{
	return(KERN_INVALID_ARGUMENT);
}

boolean_t	machine_exception();

/*
 *	ux_exception translates a mach exception, code and subcode to
 *	a signal and u.u_code.  Calls machine_exception (machine dependent)
 *	to attempt translation first.
 */

static
void ux_exception(
    int			exception,
    int			code,
    int			subcode,
    int			*ux_signal,
    int			*ux_code
)
{
    /*
     *	Try machine-dependent translation first.
     */
    if (machine_exception(exception, code, subcode, ux_signal, ux_code))
	return;
	
    switch(exception) {

	case EXC_BAD_ACCESS:
		if (code == KERN_INVALID_ADDRESS)
			*ux_signal = SIGSEGV;
		else
			*ux_signal = SIGBUS;
		break;

	case EXC_BAD_INSTRUCTION:
	    *ux_signal = SIGILL;
	    break;

	case EXC_ARITHMETIC:
	    *ux_signal = SIGFPE;
	    break;

	case EXC_EMULATION:
	    *ux_signal = SIGEMT;
	    break;

	case EXC_SOFTWARE:
	    switch (code) {

	    case EXC_UNIX_BAD_SYSCALL:
		*ux_signal = SIGSYS;
		break;
	    case EXC_UNIX_BAD_PIPE:
		*ux_signal = SIGPIPE;
		break;
	    case EXC_UNIX_ABORT:
		*ux_signal = SIGABRT;
		break;
	    }
	    break;

	case EXC_BREAKPOINT:
	    *ux_signal = SIGTRAP;
	    break;
    }
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Mach Operating System
	24	* Copyright (c) 1987 Carnegie-Mellon University
	25	* All rights reserved. The CMU software License Agreement specifies
	26	* the terms and conditions for use and redistribution.
	27	*/
	28
	29	/*
	30	*********************************************************************
	31	* HISTORY
	32	**********************************************************************
	33	*/
	34
	35	#include <sys/param.h>
	36
	37	#include <mach/boolean.h>
	38	#include <mach/exception.h>
	39	#include <mach/kern_return.h>
	40	#include <mach/message.h>
	41	#include <mach/port.h>
	42	#include <mach/mig_errors.h>
	43	#include <kern/task.h>
	44	#include <kern/thread.h>
	45	#include <kern/thread_act.h>
	46	#include <kern/kalloc.h>
	47
	48	#include <sys/proc.h>
	49	#include <sys/user.h>
	50	#include <sys/systm.h>
	51	#include <sys/ux_exception.h>
	52
	53	/*
	54	* Unix exception handler.
	55	*/
	56
	57	static void ux_exception();
	58
	59	decl_simple_lock_data(static, ux_handler_init_lock)
	60	mach_port_name_t ux_exception_port;
	61	static task_t ux_handler_self;
	62
	63	static
	64	void
65	ux_handler(void)
66	{
67	task_t self = current_task();
68	mach_port_name_t exc_port_name;
69	mach_port_name_t exc_set_name;
70
71	(void) thread_funnel_set(kernel_flock, TRUE);
72
73	/* self->kernel_vm_space = TRUE; */
74	ux_handler_self = self;
75
76
77	/*
78	* Allocate a port set that we will receive on.
79	*/
80	if (mach_port_allocate(get_task_ipcspace(ux_handler_self), MACH_PORT_RIGHT_PORT_SET, &exc_set_name) != MACH_MSG_SUCCESS)
81	panic("ux_handler: port_set_allocate failed");
82
83	/*
84	* Allocate an exception port and use object_copyin to
85	* translate it to the global name. Put it into the set.
86	*/
87	if (mach_port_allocate(get_task_ipcspace(ux_handler_self), MACH_PORT_RIGHT_RECEIVE, &exc_port_name) != MACH_MSG_SUCCESS)
88	panic("ux_handler: port_allocate failed");
89	if (mach_port_move_member(get_task_ipcspace(ux_handler_self),
90	exc_port_name, exc_set_name) != MACH_MSG_SUCCESS)
91	panic("ux_handler: port_set_add failed");
92
93	if (ipc_object_copyin(get_task_ipcspace(self), exc_port_name,
94	MACH_MSG_TYPE_MAKE_SEND,
95	(void *) &ux_exception_port) != MACH_MSG_SUCCESS)
96	panic("ux_handler: object_copyin(ux_exception_port) failed");
97
98	thread_wakeup(&ux_exception_port);
99
100	/* Message handling loop. */
101
102	for (;;) {
103	struct rep_msg {
104	mach_msg_header_t Head;
105	NDR_record_t NDR;
106	kern_return_t RetCode;
107	} rep_msg;
108	struct exc_msg {
109	mach_msg_header_t Head;
110	/* start of the kernel processed data */
111	mach_msg_body_t msgh_body;
112	mach_msg_port_descriptor_t thread;
113	mach_msg_port_descriptor_t task;
114	/* end of the kernel processed data */
115	NDR_record_t NDR;
116	exception_type_t exception;
117	mach_msg_type_number_t codeCnt;
118	exception_data_t code;
119	/* some times RCV_TO_LARGE probs */
120	char pad[512];
121	} exc_msg;
122	mach_port_name_t reply_port;
123	kern_return_t result;
124
125	exc_msg.Head.msgh_local_port = (mach_port_t)exc_set_name;
126	exc_msg.Head.msgh_size = sizeof (exc_msg);
127	#if 0
128	result = mach_msg_receive(&exc_msg.Head);
129	#else
130	result = mach_msg_receive(&exc_msg.Head, MACH_RCV_MSG,
131	sizeof (exc_msg), exc_set_name,
132	MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL,
133	0);
134	#endif
135	if (result == MACH_MSG_SUCCESS) {
136	reply_port = (mach_port_name_t)exc_msg.Head.msgh_remote_port;
137
138	if (exc_server(&exc_msg.Head, &rep_msg.Head))
139	(void) mach_msg_send(&rep_msg.Head, MACH_SEND_MSG,
140	sizeof (rep_msg),MACH_MSG_TIMEOUT_NONE,MACH_PORT_NULL);
141
142	if (reply_port != MACH_PORT_NULL)
143	(void) mach_port_deallocate(get_task_ipcspace(ux_handler_self), reply_port);
144	}
145	else if (result == MACH_RCV_TOO_LARGE)
146	/* ignore oversized messages */;
147	else
148	panic("exception_handler");
149	}
150	thread_funnel_set(kernel_flock, FALSE);
151	}
152
153	void
154	ux_handler_init(void)
155	{
156	task_t handler_task;
157
158	simple_lock_init(&ux_handler_init_lock);
159	ux_exception_port = MACH_PORT_NULL;
160	if (kernel_task_create(kernel_task,
161	0, 0, &handler_task) != MACH_MSG_SUCCESS) {
162	panic("Failed to created ux handler task\n");
163	}
164	(void) kernel_thread(handler_task, ux_handler);
165	simple_lock(&ux_handler_init_lock);
166	if (ux_exception_port == MACH_PORT_NULL) {
167	simple_unlock(&ux_handler_init_lock);
168	assert_wait(&ux_exception_port, THREAD_UNINT);
169	thread_block((void (*)(void)) 0);
170	}
171	else
172	simple_unlock(&ux_handler_init_lock);
173	}
174
175	kern_return_t
176	catch_exception_raise(
177	mach_port_name_t exception_port,
178	mach_port_name_t thread_name,
179	mach_port_name_t task_name,
180	int exception,
181	exception_data_t code,
182	mach_msg_type_number_t codecnt
183	)
184	{
185	task_t self = current_task();
186	thread_act_t th_act;
187	ipc_port_t thread_port;
188	ipc_port_t task_port;
189	kern_return_t result = MACH_MSG_SUCCESS;
190	int signal = 0;
191	u_long ucode = 0;
192	struct uthread *ut;
193
194	/*
195	* Convert local thread name to global port.
196	*/
197	if (MACH_PORT_VALID(thread_name) &&
198	(ipc_object_copyin(get_task_ipcspace(self), thread_name,
199	MACH_MSG_TYPE_PORT_SEND,
200	(void *) &thread_port) == MACH_MSG_SUCCESS)) {
201	if (IPC_OBJECT_VALID(thread_port)) {
202	th_act = (thread_act_t)convert_port_to_act(thread_port);
203	ipc_port_release(thread_port);
204	} else {
205	th_act = THR_ACT_NULL;
206	}
207
208	/*
209	* Catch bogus ports
210	*/
211	if (th_act != THR_ACT_NULL) {
212
213	/*
214	* Convert exception to unix signal and code.
215	*/
216	ut = get_bsdthread_info(th_act);
217	ux_exception(exception, code[0], code[1],
218	&signal, &ucode);
219
220	/*
221	* Send signal.
222	*/
223	if (signal != 0)
224	threadsignal(th_act, signal, ucode);
225
226	act_deallocate(th_act);
227	}
228	else
229	result = KERN_INVALID_ARGUMENT;
230	}
231	else
232	result = KERN_INVALID_ARGUMENT;
233
234	/*
235	* Delete our send rights to the task and thread ports.
236	*/
237	(void)mach_port_deallocate(get_task_ipcspace(ux_handler_self), task_name);
238	(void)mach_port_deallocate(get_task_ipcspace(ux_handler_self),thread_name);
239
240	return (result);
241	}
242	kern_return_t
243	catch_exception_raise_state(mach_port_name_t exception_port, int exception, exception_data_t code, mach_msg_type_number_t codeCnt, int flavor, thread_state_t old_state, int old_stateCnt, thread_state_t new_state, int new_stateCnt)
244	{
245	return(KERN_INVALID_ARGUMENT);
246	}
247	kern_return_t
248	catch_exception_raise_state_identity(mach_port_name_t exception_port, mach_port_t thread, mach_port_t task, int exception, exception_data_t code, mach_msg_type_number_t codeCnt, int flavor, thread_state_t old_state, int old_stateCnt, thread_state_t new_state, int new_stateCnt)
249	{
250	return(KERN_INVALID_ARGUMENT);
251	}
252
253	boolean_t machine_exception();
254
255	/*
256	* ux_exception translates a mach exception, code and subcode to
257	* a signal and u.u_code. Calls machine_exception (machine dependent)
258	* to attempt translation first.
259	*/
260
261	static
262	void ux_exception(
263	int exception,
264	int code,
265	int subcode,
266	int *ux_signal,
267	int *ux_code
268	)
269	{
270	/*
271	* Try machine-dependent translation first.
272	*/
273	if (machine_exception(exception, code, subcode, ux_signal, ux_code))
274	return;
275
276	switch(exception) {
277
278	case EXC_BAD_ACCESS:
279	if (code == KERN_INVALID_ADDRESS)
280	*ux_signal = SIGSEGV;
281	else
282	*ux_signal = SIGBUS;
283	break;
284
285	case EXC_BAD_INSTRUCTION:
286	*ux_signal = SIGILL;
287	break;
288
289	case EXC_ARITHMETIC:
290	*ux_signal = SIGFPE;
291	break;
292
293	case EXC_EMULATION:
294	*ux_signal = SIGEMT;
295	break;
296
297	case EXC_SOFTWARE:
298	switch (code) {
299
300	case EXC_UNIX_BAD_SYSCALL:
301	*ux_signal = SIGSYS;
302	break;
303	case EXC_UNIX_BAD_PIPE:
304	*ux_signal = SIGPIPE;
305	break;
306	case EXC_UNIX_ABORT:
307	*ux_signal = SIGABRT;
308	break;
309	}
310	break;
311
312	case EXC_BREAKPOINT:
313	*ux_signal = SIGTRAP;
314	break;
315	}
316	}