[apple/xnu.git] / osfmk / kdp / ml / i386 / kdp_machdep.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@
 */
/*
 * Copyright (c) 1997 Apple Computer, Inc.  All rights reserved.
 * Copyright (c) 1994 NeXT Computer, Inc.  All rights reserved.
 *
 * machdep/ppc/kdp_machdep.c
 *
 * Machine-dependent code for Remote Debugging Protocol
 *
 * March, 1997	Created.	Umesh Vaishampayan [umeshv@NeXT.com]
 *
 */
 
#include <mach/mach_types.h>
#include <mach/machine.h>
#include <mach/exception_types.h>
#include <i386/trap.h>
#include <kdp/kdp_internal.h>

#define KDP_TEST_HARNESS 0
#if KDP_TEST_HARNESS
#define dprintf(x) printf x
#else
#define dprintf(x)
#endif

void print_saved_state(void *);
void kdp_call(void);
void kdp_i386_trap(unsigned int, struct i386_saved_state *, kern_return_t, vm_offset_t);
int kdp_getc(void);

void
kdp_exception(
    unsigned char	*pkt,
    int	*len,
    unsigned short	*remote_port,
    unsigned int	exception,
    unsigned int	code,
    unsigned int	subcode
)
{
    kdp_exception_t	*rq = (kdp_exception_t *)pkt;

    rq->hdr.request = KDP_EXCEPTION;
    rq->hdr.is_reply = 0;
    rq->hdr.seq = kdp.exception_seq;
    rq->hdr.key = 0;
    rq->hdr.len = sizeof (*rq);
    
    rq->n_exc_info = 1;
    rq->exc_info[0].cpu = 0;
    rq->exc_info[0].exception = exception;
    rq->exc_info[0].code = code;
    rq->exc_info[0].subcode = subcode;
    
    rq->hdr.len += rq->n_exc_info * sizeof (kdp_exc_info_t);
    
    bcopy((char *)rq, (char *)pkt, rq->hdr.len);

    kdp.exception_ack_needed = TRUE;
    
    *remote_port = kdp.exception_port;
    *len = rq->hdr.len;
}

boolean_t
kdp_exception_ack(
    unsigned char	*pkt,
    int			len
)
{
    kdp_exception_ack_t	*rq = (kdp_exception_ack_t *)pkt;

    if (len < sizeof (*rq))
	return(FALSE);
	
    if (!rq->hdr.is_reply || rq->hdr.request != KDP_EXCEPTION)
    	return(FALSE);
	
    dprintf(("kdp_exception_ack seq %x %x\n", rq->hdr.seq, kdp.exception_seq));
	
    if (rq->hdr.seq == kdp.exception_seq) {
	kdp.exception_ack_needed = FALSE;
	kdp.exception_seq++;
    }
    return(TRUE);
}

void
kdp_getstate(
    i386_thread_state_t		*state
)
{
    struct i386_saved_state	*saved_state;
    
    saved_state = (struct i386_saved_state *)kdp.saved_state;
    
    *state = (i386_thread_state_t) { 0 };	
    state->eax = saved_state->eax;
    state->ebx = saved_state->ebx;
    state->ecx = saved_state->ecx;
    state->edx = saved_state->edx;
    state->edi = saved_state->edi;
    state->esi = saved_state->esi;
    state->ebp = saved_state->ebp;

    if ((saved_state->cs & 0x3) == 0){	/* Kernel State */
    	state->esp = (unsigned int) &saved_state->uesp;
        state->ss = KERNEL_DS;
    } else {
    	state->esp = saved_state->uesp;
    	state->ss = saved_state->ss;
    }

    state->eflags = saved_state->efl;
    state->eip = saved_state->eip;
    state->cs = saved_state->cs;
    state->ds = saved_state->ds;
    state->es = saved_state->es;
    state->fs = saved_state->fs;
    state->gs = saved_state->gs;
}


void
kdp_setstate(
    i386_thread_state_t		*state
)
{
    struct i386_saved_state	*saved_state;
    
    saved_state = (struct i386_saved_state *)kdp.saved_state;

    saved_state->eax = state->eax;
    saved_state->ebx = state->ebx;
    saved_state->ecx = state->ecx;
    saved_state->edx = state->edx;
    saved_state->edi = state->edi;
    saved_state->esi = state->esi;
    saved_state->ebp = state->ebp;
    saved_state->efl = state->eflags;
#if	0
    saved_state->frame.eflags &= ~( EFL_VM | EFL_NT | EFL_IOPL | EFL_CLR );
    saved_state->frame.eflags |=  ( EFL_IF | EFL_SET );
#endif
    saved_state->eip = state->eip;
    saved_state->fs = state->fs;
    saved_state->gs = state->gs;
}


kdp_error_t
kdp_machine_read_regs(
    unsigned int cpu,
    unsigned int flavor,
    char *data,
    int *size
)
{
    switch (flavor) {

    case i386_THREAD_STATE:
	dprintf(("kdp_readregs THREAD_STATE\n"));
	kdp_getstate((i386_thread_state_t *)data);
	*size = sizeof (i386_thread_state_t);
	return KDPERR_NO_ERROR;
	
    case i386_THREAD_FPSTATE:
	dprintf(("kdp_readregs THREAD_FPSTATE\n"));
	*(i386_thread_fpstate_t *)data = (i386_thread_fpstate_t) { 0 };	
	*size = sizeof (i386_thread_fpstate_t);
	return KDPERR_NO_ERROR;
	
    default:
	dprintf(("kdp_readregs bad flavor %d\n"));
	return KDPERR_BADFLAVOR;
    }
}

kdp_error_t
kdp_machine_write_regs(
    unsigned int cpu,
    unsigned int flavor,
    char *data,
    int *size
)
{
    switch (flavor) {

    case i386_THREAD_STATE:
	dprintf(("kdp_writeregs THREAD_STATE\n"));
	kdp_setstate((i386_thread_state_t *)data);
	return KDPERR_NO_ERROR;
	
    case i386_THREAD_FPSTATE:
	dprintf(("kdp_writeregs THREAD_FPSTATE\n"));
	return KDPERR_NO_ERROR;
	
    default:
	dprintf(("kdp_writeregs bad flavor %d\n"));
	return KDPERR_BADFLAVOR;
    }
}


void
kdp_machine_hostinfo(
    kdp_hostinfo_t *hostinfo
)
{
    machine_slot_t	m;
    int			i;

    hostinfo->cpus_mask = 0;

    for (i = 0; i < machine_info.max_cpus; i++) {
        m = &machine_slot[i];
        if (!m->is_cpu)
            continue;
	
        hostinfo->cpus_mask |= (1 << i);
    }

   /* FIXME?? */
    hostinfo->cpu_type = CPU_TYPE_I386;
    hostinfo->cpu_subtype = CPU_SUBTYPE_486;
}

void
kdp_panic(
    const char		*msg
)
{
    printf("kdp panic: %s\n", msg);    
    __asm__ volatile("hlt");	
}


void
kdp_reboot(void)
{
    kdreboot();
}

int
kdp_intr_disbl(void)
{
   return splhigh();
}

void
kdp_intr_enbl(int s)
{
	splx(s);
}

int
kdp_getc()
{
	return	cnmaygetc();
}

void
kdp_us_spin(int usec)
{
    extern void delay(int);

    delay(usec/100);
}

void print_saved_state(void *state)
{
    struct i386_saved_state	*saved_state;

    saved_state = state;

	printf("pc = 0x%x\n", saved_state->eip);
	printf("cr3= 0x%x\n", saved_state->cr2);
	printf("rp = TODO FIXME\n");
	printf("sp = 0x%x\n", saved_state->esp);

}

void
kdp_sync_cache()
{
	return;	/* No op here. */
}

void
kdp_call()
{
	__asm__ volatile ("int	$3");	/* Let the processor do the work */
}


typedef struct _cframe_t {
    struct _cframe_t	*prev;
    unsigned		caller;
    unsigned		args[0];
} cframe_t;


#define MAX_FRAME_DELTA		65536

void
kdp_i386_backtrace(void	*_frame, int nframes)
{
	cframe_t	*frame = (cframe_t *)_frame;
	int i;

	for (i=0; i<nframes; i++) {
	    if ((vm_offset_t)frame < VM_MIN_KERNEL_ADDRESS ||
	        (vm_offset_t)frame > VM_MAX_KERNEL_ADDRESS) {
		goto invalid;
	    }
	    printf("frame %x called by %x ",
		frame, frame->caller);
	    printf("args %x %x %x %x\n",
		frame->args[0], frame->args[1],
		frame->args[2], frame->args[3]);
	    if ((frame->prev < frame) ||	/* wrong direction */
	    	((frame->prev - frame) > MAX_FRAME_DELTA)) {
		goto invalid;
	    }
	    frame = frame->prev;
	}
	return;
invalid:
	printf("invalid frame pointer %x\n",frame->prev);
}

void
kdp_i386_trap(
    unsigned int		trapno,
    struct i386_saved_state	*saved_state,
    kern_return_t	result,
    vm_offset_t		va
)
{
    unsigned int exception, subcode = 0, code;

    if (trapno != T_INT3 && trapno != T_DEBUG)
    	printf("unexpected kernel trap %x eip %x\n", trapno, saved_state->eip);

    switch (trapno) {
    
    case T_DIVIDE_ERROR:
	exception = EXC_ARITHMETIC;
	code = EXC_I386_DIVERR;
	break;
    
    case T_OVERFLOW:
	exception = EXC_SOFTWARE;
	code = EXC_I386_INTOFLT;
	break;
    
    case T_OUT_OF_BOUNDS:
	exception = EXC_ARITHMETIC;
	code = EXC_I386_BOUNDFLT;
	break;
    
    case T_INVALID_OPCODE:
	exception = EXC_BAD_INSTRUCTION;
	code = EXC_I386_INVOPFLT;
	break;
    
    case T_SEGMENT_NOT_PRESENT:
	exception = EXC_BAD_INSTRUCTION;
	code = EXC_I386_SEGNPFLT;
	subcode	= saved_state->err;
	break;
    
    case T_STACK_FAULT:
	exception = EXC_BAD_INSTRUCTION;
	code = EXC_I386_STKFLT;
	subcode	= saved_state->err;
	break;
    
    case T_GENERAL_PROTECTION:
	exception = EXC_BAD_INSTRUCTION;
	code = EXC_I386_GPFLT;
	subcode	= saved_state->err;
	break;
	
    case T_PAGE_FAULT:
    	exception = EXC_BAD_ACCESS;
	code = result;
	subcode = va;
	break;
    
    case T_WATCHPOINT:
	exception = EXC_SOFTWARE;
	code = EXC_I386_ALIGNFLT;
	break;
	
    case T_DEBUG:
    case T_INT3:
	exception = EXC_BREAKPOINT;
	code = EXC_I386_BPTFLT;
	break;

    default:
    	exception = EXC_BAD_INSTRUCTION;
	code = trapno;
	break;
    }

//  kdp_i386_backtrace((void *) saved_state->ebp, 10);

    kdp_raise_exception(exception, code, subcode, saved_state);
}

boolean_t 
kdp_call_kdb(
        void) 
{       
        return(FALSE);
}
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	* Copyright (c) 1997 Apple Computer, Inc. All rights reserved.
	24	* Copyright (c) 1994 NeXT Computer, Inc. All rights reserved.
	25	*
	26	* machdep/ppc/kdp_machdep.c
	27	*
	28	* Machine-dependent code for Remote Debugging Protocol
	29	*
	30	* March, 1997 Created. Umesh Vaishampayan [umeshv@NeXT.com]
	31	*
	32	*/
	33
	34	#include <mach/mach_types.h>
	35	#include <mach/machine.h>
	36	#include <mach/exception_types.h>
	37	#include <i386/trap.h>
	38	#include <kdp/kdp_internal.h>
	39
	40	#define KDP_TEST_HARNESS 0
	41	#if KDP_TEST_HARNESS
	42	#define dprintf(x) printf x
	43	#else
	44	#define dprintf(x)
	45	#endif
	46
	47	void print_saved_state(void *);
	48	void kdp_call(void);
	49	void kdp_i386_trap(unsigned int, struct i386_saved_state *, kern_return_t, vm_offset_t);
	50	int kdp_getc(void);
	51
	52	void
	53	kdp_exception(
	54	unsigned char *pkt,
	55	int *len,
	56	unsigned short *remote_port,
	57	unsigned int exception,
	58	unsigned int code,
	59	unsigned int subcode
	60	)
	61	{
	62	kdp_exception_t rq = (kdp_exception_t )pkt;
	63
	64	rq->hdr.request = KDP_EXCEPTION;
65	rq->hdr.is_reply = 0;
66	rq->hdr.seq = kdp.exception_seq;
67	rq->hdr.key = 0;
68	rq->hdr.len = sizeof (*rq);
69
70	rq->n_exc_info = 1;
71	rq->exc_info[0].cpu = 0;
72	rq->exc_info[0].exception = exception;
73	rq->exc_info[0].code = code;
74	rq->exc_info[0].subcode = subcode;
75
76	rq->hdr.len += rq->n_exc_info * sizeof (kdp_exc_info_t);
77
78	bcopy((char )rq, (char )pkt, rq->hdr.len);
79
80	kdp.exception_ack_needed = TRUE;
81
82	*remote_port = kdp.exception_port;
83	*len = rq->hdr.len;
84	}
85
86	boolean_t
87	kdp_exception_ack(
88	unsigned char *pkt,
89	int len
90	)
91	{
92	kdp_exception_ack_t rq = (kdp_exception_ack_t )pkt;
93
94	if (len < sizeof (*rq))
95	return(FALSE);
96
97	if (!rq->hdr.is_reply \|\| rq->hdr.request != KDP_EXCEPTION)
98	return(FALSE);
99
100	dprintf(("kdp_exception_ack seq %x %x\n", rq->hdr.seq, kdp.exception_seq));
101
102	if (rq->hdr.seq == kdp.exception_seq) {
103	kdp.exception_ack_needed = FALSE;
104	kdp.exception_seq++;
105	}
106	return(TRUE);
107	}
108
109	void
110	kdp_getstate(
111	i386_thread_state_t *state
112	)
113	{
114	struct i386_saved_state *saved_state;
115
116	saved_state = (struct i386_saved_state *)kdp.saved_state;
117
118	*state = (i386_thread_state_t) { 0 };
119	state->eax = saved_state->eax;
120	state->ebx = saved_state->ebx;
121	state->ecx = saved_state->ecx;
122	state->edx = saved_state->edx;
123	state->edi = saved_state->edi;
124	state->esi = saved_state->esi;
125	state->ebp = saved_state->ebp;
126
127	if ((saved_state->cs & 0x3) == 0){ /* Kernel State */
128	state->esp = (unsigned int) &saved_state->uesp;
129	state->ss = KERNEL_DS;
130	} else {
131	state->esp = saved_state->uesp;
132	state->ss = saved_state->ss;
133	}
134
135	state->eflags = saved_state->efl;
136	state->eip = saved_state->eip;
137	state->cs = saved_state->cs;
138	state->ds = saved_state->ds;
139	state->es = saved_state->es;
140	state->fs = saved_state->fs;
141	state->gs = saved_state->gs;
142	}
143
144
145	void
146	kdp_setstate(
147	i386_thread_state_t *state
148	)
149	{
150	struct i386_saved_state *saved_state;
151
152	saved_state = (struct i386_saved_state *)kdp.saved_state;
153
154	saved_state->eax = state->eax;
155	saved_state->ebx = state->ebx;
156	saved_state->ecx = state->ecx;
157	saved_state->edx = state->edx;
158	saved_state->edi = state->edi;
159	saved_state->esi = state->esi;
160	saved_state->ebp = state->ebp;
161	saved_state->efl = state->eflags;
162	#if 0
163	saved_state->frame.eflags &= ~( EFL_VM \| EFL_NT \| EFL_IOPL \| EFL_CLR );
164	saved_state->frame.eflags \|= ( EFL_IF \| EFL_SET );
165	#endif
166	saved_state->eip = state->eip;
167	saved_state->fs = state->fs;
168	saved_state->gs = state->gs;
169	}
170
171
172	kdp_error_t
173	kdp_machine_read_regs(
174	unsigned int cpu,
175	unsigned int flavor,
176	char *data,
177	int *size
178	)
179	{
180	switch (flavor) {
181
182	case i386_THREAD_STATE:
183	dprintf(("kdp_readregs THREAD_STATE\n"));
184	kdp_getstate((i386_thread_state_t *)data);
185	*size = sizeof (i386_thread_state_t);
186	return KDPERR_NO_ERROR;
187
188	case i386_THREAD_FPSTATE:
189	dprintf(("kdp_readregs THREAD_FPSTATE\n"));
190	(i386_thread_fpstate_t )data = (i386_thread_fpstate_t) { 0 };
191	*size = sizeof (i386_thread_fpstate_t);
192	return KDPERR_NO_ERROR;
193
194	default:
195	dprintf(("kdp_readregs bad flavor %d\n"));
196	return KDPERR_BADFLAVOR;
197	}
198	}
199
200	kdp_error_t
201	kdp_machine_write_regs(
202	unsigned int cpu,
203	unsigned int flavor,
204	char *data,
205	int *size
206	)
207	{
208	switch (flavor) {
209
210	case i386_THREAD_STATE:
211	dprintf(("kdp_writeregs THREAD_STATE\n"));
212	kdp_setstate((i386_thread_state_t *)data);
213	return KDPERR_NO_ERROR;
214
215	case i386_THREAD_FPSTATE:
216	dprintf(("kdp_writeregs THREAD_FPSTATE\n"));
217	return KDPERR_NO_ERROR;
218
219	default:
220	dprintf(("kdp_writeregs bad flavor %d\n"));
221	return KDPERR_BADFLAVOR;
222	}
223	}
224
225
226
227	void
228	kdp_machine_hostinfo(
229	kdp_hostinfo_t *hostinfo
230	)
231	{
232	machine_slot_t m;
233	int i;
234
235	hostinfo->cpus_mask = 0;
236
237	for (i = 0; i < machine_info.max_cpus; i++) {
238	m = &machine_slot[i];
239	if (!m->is_cpu)
240	continue;
241
242	hostinfo->cpus_mask \|= (1 << i);
243	}
244
245	/* FIXME?? */
246	hostinfo->cpu_type = CPU_TYPE_I386;
247	hostinfo->cpu_subtype = CPU_SUBTYPE_486;
248	}
249
250	void
251	kdp_panic(
252	const char *msg
253	)
254	{
255	printf("kdp panic: %s\n", msg);
256	__asm__ volatile("hlt");
257	}
258
259
260	void
261	kdp_reboot(void)
262	{
263	kdreboot();
264	}
265
266	int
267	kdp_intr_disbl(void)
268	{
269	return splhigh();
270	}
271
272	void
273	kdp_intr_enbl(int s)
274	{
275	splx(s);
276	}
277
278	int
279	kdp_getc()
280	{
281	return cnmaygetc();
282	}
283
284	void
285	kdp_us_spin(int usec)
286	{
287	extern void delay(int);
288
289	delay(usec/100);
290	}
291
292	void print_saved_state(void *state)
293	{
294	struct i386_saved_state *saved_state;
295
296	saved_state = state;
297
298	printf("pc = 0x%x\n", saved_state->eip);
299	printf("cr3= 0x%x\n", saved_state->cr2);
300	printf("rp = TODO FIXME\n");
301	printf("sp = 0x%x\n", saved_state->esp);
302
303	}
304
305	void
306	kdp_sync_cache()
307	{
308	return; /* No op here. */
309	}
310
311	void
312	kdp_call()
313	{
314	__asm__ volatile ("int $3"); /* Let the processor do the work */
315	}
316
317
318	typedef struct _cframe_t {
319	struct _cframe_t *prev;
320	unsigned caller;
321	unsigned args[0];
322	} cframe_t;
323
324
325	#define MAX_FRAME_DELTA 65536
326
327	void
328	kdp_i386_backtrace(void *_frame, int nframes)
329	{
330	cframe_t frame = (cframe_t )_frame;
331	int i;
332
333	for (i=0; i<nframes; i++) {
334	if ((vm_offset_t)frame < VM_MIN_KERNEL_ADDRESS \|\|
335	(vm_offset_t)frame > VM_MAX_KERNEL_ADDRESS) {
336	goto invalid;
337	}
338	printf("frame %x called by %x ",
339	frame, frame->caller);
340	printf("args %x %x %x %x\n",
341	frame->args[0], frame->args[1],
342	frame->args[2], frame->args[3]);
343	if ((frame->prev < frame) \|\| /* wrong direction */
344	((frame->prev - frame) > MAX_FRAME_DELTA)) {
345	goto invalid;
346	}
347	frame = frame->prev;
348	}
349	return;
350	invalid:
351	printf("invalid frame pointer %x\n",frame->prev);
352	}
353
354	void
355	kdp_i386_trap(
356	unsigned int trapno,
357	struct i386_saved_state *saved_state,
358	kern_return_t result,
359	vm_offset_t va
360	)
361	{
362	unsigned int exception, subcode = 0, code;
363
364	if (trapno != T_INT3 && trapno != T_DEBUG)
365	printf("unexpected kernel trap %x eip %x\n", trapno, saved_state->eip);
366
367	switch (trapno) {
368
369	case T_DIVIDE_ERROR:
370	exception = EXC_ARITHMETIC;
371	code = EXC_I386_DIVERR;
372	break;
373
374	case T_OVERFLOW:
375	exception = EXC_SOFTWARE;
376	code = EXC_I386_INTOFLT;
377	break;
378
379	case T_OUT_OF_BOUNDS:
380	exception = EXC_ARITHMETIC;
381	code = EXC_I386_BOUNDFLT;
382	break;
383
384	case T_INVALID_OPCODE:
385	exception = EXC_BAD_INSTRUCTION;
386	code = EXC_I386_INVOPFLT;
387	break;
388
389	case T_SEGMENT_NOT_PRESENT:
390	exception = EXC_BAD_INSTRUCTION;
391	code = EXC_I386_SEGNPFLT;
392	subcode = saved_state->err;
393	break;
394
395	case T_STACK_FAULT:
396	exception = EXC_BAD_INSTRUCTION;
397	code = EXC_I386_STKFLT;
398	subcode = saved_state->err;
399	break;
400
401	case T_GENERAL_PROTECTION:
402	exception = EXC_BAD_INSTRUCTION;
403	code = EXC_I386_GPFLT;
404	subcode = saved_state->err;
405	break;
406
407	case T_PAGE_FAULT:
408	exception = EXC_BAD_ACCESS;
409	code = result;
410	subcode = va;
411	break;
412
413	case T_WATCHPOINT:
414	exception = EXC_SOFTWARE;
415	code = EXC_I386_ALIGNFLT;
416	break;
417
418	case T_DEBUG:
419	case T_INT3:
420	exception = EXC_BREAKPOINT;
421	code = EXC_I386_BPTFLT;
422	break;
423
424	default:
425	exception = EXC_BAD_INSTRUCTION;
426	code = trapno;
427	break;
428	}
429
430	// kdp_i386_backtrace((void *) saved_state->ebp, 10);
431
432	kdp_raise_exception(exception, code, subcode, saved_state);
433	}
434
435	boolean_t
436	kdp_call_kdb(
437	void)
438	{
439	return(FALSE);
440	}