[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@
 */
 
#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);
}

unsigned int kdp_ml_get_breakinsn()
{
  return 0xcc;
}
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	*/
1c79356b A	22
	23	#include <mach/mach_types.h>
	24	#include <mach/machine.h>
	25	#include <mach/exception_types.h>
	26	#include <i386/trap.h>
	27	#include <kdp/kdp_internal.h>
	28
	29	#define KDP_TEST_HARNESS 0
	30	#if KDP_TEST_HARNESS
	31	#define dprintf(x) printf x
	32	#else
	33	#define dprintf(x)
	34	#endif
	35
	36	void print_saved_state(void *);
	37	void kdp_call(void);
	38	void kdp_i386_trap(unsigned int, struct i386_saved_state *, kern_return_t, vm_offset_t);
	39	int kdp_getc(void);
	40
	41	void
	42	kdp_exception(
	43	unsigned char *pkt,
	44	int *len,
	45	unsigned short *remote_port,
	46	unsigned int exception,
	47	unsigned int code,
	48	unsigned int subcode
	49	)
	50	{
	51	kdp_exception_t rq = (kdp_exception_t )pkt;
	52
	53	rq->hdr.request = KDP_EXCEPTION;
	54	rq->hdr.is_reply = 0;
	55	rq->hdr.seq = kdp.exception_seq;
	56	rq->hdr.key = 0;
	57	rq->hdr.len = sizeof (*rq);
	58
	59	rq->n_exc_info = 1;
	60	rq->exc_info[0].cpu = 0;
	61	rq->exc_info[0].exception = exception;
	62	rq->exc_info[0].code = code;
	63	rq->exc_info[0].subcode = subcode;
	64
	65	rq->hdr.len += rq->n_exc_info * sizeof (kdp_exc_info_t);
	66
	67	bcopy((char )rq, (char )pkt, rq->hdr.len);
	68
	69	kdp.exception_ack_needed = TRUE;
	70
	71	*remote_port = kdp.exception_port;
	72	*len = rq->hdr.len;
	73	}
	74
	75	boolean_t
	76	kdp_exception_ack(
	77	unsigned char *pkt,
	78	int len
	79	)
	80	{
	81	kdp_exception_ack_t rq = (kdp_exception_ack_t )pkt;
	82
	83	if (len < sizeof (*rq))
	84	return(FALSE);
	85
86	if (!rq->hdr.is_reply \|\| rq->hdr.request != KDP_EXCEPTION)
87	return(FALSE);
88
89	dprintf(("kdp_exception_ack seq %x %x\n", rq->hdr.seq, kdp.exception_seq));
90
91	if (rq->hdr.seq == kdp.exception_seq) {
92	kdp.exception_ack_needed = FALSE;
93	kdp.exception_seq++;
94	}
95	return(TRUE);
96	}
97
98	void
99	kdp_getstate(
100	i386_thread_state_t *state
101	)
102	{
103	struct i386_saved_state *saved_state;
104
105	saved_state = (struct i386_saved_state *)kdp.saved_state;
106
107	*state = (i386_thread_state_t) { 0 };
108	state->eax = saved_state->eax;
109	state->ebx = saved_state->ebx;
110	state->ecx = saved_state->ecx;
111	state->edx = saved_state->edx;
112	state->edi = saved_state->edi;
113	state->esi = saved_state->esi;
114	state->ebp = saved_state->ebp;
115
116	if ((saved_state->cs & 0x3) == 0){ /* Kernel State */
117	state->esp = (unsigned int) &saved_state->uesp;
118	state->ss = KERNEL_DS;
119	} else {
120	state->esp = saved_state->uesp;
121	state->ss = saved_state->ss;
122	}
123
124	state->eflags = saved_state->efl;
125	state->eip = saved_state->eip;
126	state->cs = saved_state->cs;
127	state->ds = saved_state->ds;
128	state->es = saved_state->es;
129	state->fs = saved_state->fs;
130	state->gs = saved_state->gs;
131	}
132
133
134	void
135	kdp_setstate(
136	i386_thread_state_t *state
137	)
138	{
139	struct i386_saved_state *saved_state;
140
141	saved_state = (struct i386_saved_state *)kdp.saved_state;
142
143	saved_state->eax = state->eax;
144	saved_state->ebx = state->ebx;
145	saved_state->ecx = state->ecx;
146	saved_state->edx = state->edx;
147	saved_state->edi = state->edi;
148	saved_state->esi = state->esi;
149	saved_state->ebp = state->ebp;
150	saved_state->efl = state->eflags;
151	#if 0
152	saved_state->frame.eflags &= ~( EFL_VM \| EFL_NT \| EFL_IOPL \| EFL_CLR );
153	saved_state->frame.eflags \|= ( EFL_IF \| EFL_SET );
154	#endif
155	saved_state->eip = state->eip;
156	saved_state->fs = state->fs;
157	saved_state->gs = state->gs;
158	}
159
160
161	kdp_error_t
162	kdp_machine_read_regs(
163	unsigned int cpu,
164	unsigned int flavor,
165	char *data,
166	int *size
167	)
168	{
169	switch (flavor) {
170
171	case i386_THREAD_STATE:
172	dprintf(("kdp_readregs THREAD_STATE\n"));
173	kdp_getstate((i386_thread_state_t *)data);
174	*size = sizeof (i386_thread_state_t);
175	return KDPERR_NO_ERROR;
176
177	case i386_THREAD_FPSTATE:
178	dprintf(("kdp_readregs THREAD_FPSTATE\n"));
179	(i386_thread_fpstate_t )data = (i386_thread_fpstate_t) { 0 };
180	*size = sizeof (i386_thread_fpstate_t);
181	return KDPERR_NO_ERROR;
182
183	default:
184	dprintf(("kdp_readregs bad flavor %d\n"));
185	return KDPERR_BADFLAVOR;
186	}
187	}
188
189	kdp_error_t
190	kdp_machine_write_regs(
191	unsigned int cpu,
192	unsigned int flavor,
193	char *data,
194	int *size
195	)
196	{
197	switch (flavor) {
198
199	case i386_THREAD_STATE:
200	dprintf(("kdp_writeregs THREAD_STATE\n"));
201	kdp_setstate((i386_thread_state_t *)data);
202	return KDPERR_NO_ERROR;
203
204	case i386_THREAD_FPSTATE:
205	dprintf(("kdp_writeregs THREAD_FPSTATE\n"));
206	return KDPERR_NO_ERROR;
207
208	default:
209	dprintf(("kdp_writeregs bad flavor %d\n"));
210	return KDPERR_BADFLAVOR;
211	}
212	}
213
214
215
216	void
217	kdp_machine_hostinfo(
218	kdp_hostinfo_t *hostinfo
219	)
220	{
221	machine_slot_t m;
222	int i;
223
224	hostinfo->cpus_mask = 0;
225
226	for (i = 0; i < machine_info.max_cpus; i++) {
227	m = &machine_slot[i];
228	if (!m->is_cpu)
229	continue;
230
231	hostinfo->cpus_mask \|= (1 << i);
232	}
233
234	/* FIXME?? */
235	hostinfo->cpu_type = CPU_TYPE_I386;
236	hostinfo->cpu_subtype = CPU_SUBTYPE_486;
237	}
238
239	void
240	kdp_panic(
241	const char *msg
242	)
243	{
244	printf("kdp panic: %s\n", msg);
245	__asm__ volatile("hlt");
246	}
247
248
249	void
250	kdp_reboot(void)
251	{
252	kdreboot();
253	}
254
255	int
256	kdp_intr_disbl(void)
257	{
258	return splhigh();
259	}
260
261	void
262	kdp_intr_enbl(int s)
263	{
264	splx(s);
265	}
266
267	int
268	kdp_getc()
269	{
270	return cnmaygetc();
271	}
272
273	void
274	kdp_us_spin(int usec)
275	{
276	extern void delay(int);
277
278	delay(usec/100);
279	}
280
281	void print_saved_state(void *state)
282	{
283	struct i386_saved_state *saved_state;
284
285	saved_state = state;
286
287	printf("pc = 0x%x\n", saved_state->eip);
288	printf("cr3= 0x%x\n", saved_state->cr2);
289	printf("rp = TODO FIXME\n");
290	printf("sp = 0x%x\n", saved_state->esp);
291
292	}
293
294	void
295	kdp_sync_cache()
296	{
297	return; /* No op here. */
298	}
299
300	void
301	kdp_call()
302	{
303	__asm__ volatile ("int $3"); /* Let the processor do the work */
304	}
305
306
307	typedef struct _cframe_t {
308	struct _cframe_t *prev;
309	unsigned caller;
310	unsigned args[0];
311	} cframe_t;
312
313
314	#define MAX_FRAME_DELTA 65536
315
316	void
317	kdp_i386_backtrace(void *_frame, int nframes)
318	{
319	cframe_t frame = (cframe_t )_frame;
320	int i;
321
322	for (i=0; i<nframes; i++) {
323	if ((vm_offset_t)frame < VM_MIN_KERNEL_ADDRESS \|\|
324	(vm_offset_t)frame > VM_MAX_KERNEL_ADDRESS) {
325	goto invalid;
326	}
327	printf("frame %x called by %x ",
328	frame, frame->caller);
329	printf("args %x %x %x %x\n",
330	frame->args[0], frame->args[1],
331	frame->args[2], frame->args[3]);
332	if ((frame->prev < frame) \|\| /* wrong direction */
333	((frame->prev - frame) > MAX_FRAME_DELTA)) {
334	goto invalid;
335	}
336	frame = frame->prev;
337	}
338	return;
339	invalid:
340	printf("invalid frame pointer %x\n",frame->prev);
341	}
342
343	void
344	kdp_i386_trap(
345	unsigned int trapno,
346	struct i386_saved_state *saved_state,
347	kern_return_t result,
348	vm_offset_t va
349	)
350	{
351	unsigned int exception, subcode = 0, code;
352
353	if (trapno != T_INT3 && trapno != T_DEBUG)
354	printf("unexpected kernel trap %x eip %x\n", trapno, saved_state->eip);
355
356	switch (trapno) {
357
358	case T_DIVIDE_ERROR:
359	exception = EXC_ARITHMETIC;
360	code = EXC_I386_DIVERR;
361	break;
362
363	case T_OVERFLOW:
364	exception = EXC_SOFTWARE;
365	code = EXC_I386_INTOFLT;
366	break;
367
368	case T_OUT_OF_BOUNDS:
369	exception = EXC_ARITHMETIC;
370	code = EXC_I386_BOUNDFLT;
371	break;
372
373	case T_INVALID_OPCODE:
374	exception = EXC_BAD_INSTRUCTION;
375	code = EXC_I386_INVOPFLT;
376	break;
377
378	case T_SEGMENT_NOT_PRESENT:
379	exception = EXC_BAD_INSTRUCTION;
380	code = EXC_I386_SEGNPFLT;
381	subcode = saved_state->err;
382	break;
383
384	case T_STACK_FAULT:
385	exception = EXC_BAD_INSTRUCTION;
386	code = EXC_I386_STKFLT;
387	subcode = saved_state->err;
388	break;
389
390	case T_GENERAL_PROTECTION:
391	exception = EXC_BAD_INSTRUCTION;
392	code = EXC_I386_GPFLT;
393	subcode = saved_state->err;
394	break;
395
396	case T_PAGE_FAULT:
397	exception = EXC_BAD_ACCESS;
398	code = result;
399	subcode = va;
400	break;
401
402	case T_WATCHPOINT:
403	exception = EXC_SOFTWARE;
404	code = EXC_I386_ALIGNFLT;
405	break;
406
407	case T_DEBUG:
408	case T_INT3:
409	exception = EXC_BREAKPOINT;
410	code = EXC_I386_BPTFLT;
411	break;
412
413	default:
414	exception = EXC_BAD_INSTRUCTION;
415	code = trapno;
416	break;
417	}
418
9bccf70c	419	kdp_i386_backtrace((void *) saved_state->ebp, 10);
1c79356b A	420
	421	kdp_raise_exception(exception, code, subcode, saved_state);
	422	}
	423
	424	boolean_t
	425	kdp_call_kdb(
	426	void)
	427	{
	428	return(FALSE);
	429	}
9bccf70c A	430
	431	unsigned int kdp_ml_get_breakinsn()
	432	{
	433	return 0xcc;
	434	}