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	1	/*
	2	* Copyright (c) 2000-2004 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	#include <mach/mach_types.h>
	24	#include <mach/exception_types.h>
	25	#include <ppc/exception.h>
	26	#include <ppc/proc_reg.h>
	27	#include <kdp/kdp_internal.h>
	28	#include <ppc/savearea.h>
	29	#include <kern/debug.h>
	30	#include <IOKit/IOPlatformExpert.h>
	31
	32	#define KDP_TEST_HARNESS 0
	33	#if KDP_TEST_HARNESS
	34	#define dprintf(x) kprintf x
	35	#else
	36	#define dprintf(x)
	37	#endif
	38
	39	void print_saved_state(void *);
	40	void kdp_call(void);
	41	void kdp_trap( unsigned int, struct savearea *saved_state);
	42	int kdp_getc(void);
	43	boolean_t kdp_call_kdb(void);
	44
	45	void
	46	kdp_exception(
	47	unsigned char *pkt,
	48	int *len,
	49	unsigned short *remote_port,
	50	unsigned int exception,
	51	unsigned int code,
	52	unsigned int subcode
	53	)
	54	{
	55	struct {
	56	kdp_exception_t pkt;
	57	kdp_exc_info_t exc;
	58	} aligned_pkt;
	59	kdp_exception_t rq = (kdp_exception_t )&aligned_pkt;
	60
	61	bcopy((char )pkt, (char )rq, sizeof(*rq));
	62	rq->hdr.request = KDP_EXCEPTION;
	63	rq->hdr.is_reply = 0;
	64	rq->hdr.seq = kdp.exception_seq;
	65	rq->hdr.key = 0;
	66	rq->hdr.len = sizeof (*rq) + sizeof(kdp_exc_info_t);
	67
	68	rq->n_exc_info = 1;
	69	rq->exc_info[0].cpu = 0;
	70	rq->exc_info[0].exception = exception;
	71	rq->exc_info[0].code = code;
	72	rq->exc_info[0].subcode = subcode;
	73
	74	rq->hdr.len += rq->n_exc_info * sizeof (kdp_exc_info_t);
	75
	76	bcopy((char )rq, (char )pkt, rq->hdr.len);
	77
	78	kdp.exception_ack_needed = TRUE;
	79
	80	*remote_port = kdp.exception_port;
	81	*len = rq->hdr.len;
	82	}
	83
	84	boolean_t
	85	kdp_exception_ack(
	86	unsigned char *pkt,
	87	int len
	88	)
	89	{
	90	kdp_exception_ack_t aligned_pkt;
	91	kdp_exception_ack_t rq = (kdp_exception_ack_t )&aligned_pkt;
	92
	93	if (len < sizeof (*rq))
	94	return(FALSE);
	95
	96	bcopy((char )pkt, (char )rq, sizeof(*rq));
	97
	98	if (!rq->hdr.is_reply \|\| rq->hdr.request != KDP_EXCEPTION)
	99	return(FALSE);
	100
	101	dprintf(("kdp_exception_ack seq %x %x\n", rq->hdr.seq, kdp.exception_seq));
	102
	103	if (rq->hdr.seq == kdp.exception_seq) {
	104	kdp.exception_ack_needed = FALSE;
	105	kdp.exception_seq++;
	106	}
	107	return(TRUE);
	108	}
	109
	110	static void
	111	kdp_getintegerstate(
	112	struct ppc_thread_state *state
	113	)
	114	{
	115	struct savearea *saved_state;
	116
	117	saved_state = kdp.saved_state;
	118
	119	bzero((char *)state,sizeof (struct ppc_thread_state)) ;
	120
	121	state->srr0 = (unsigned int)saved_state->save_srr0;
	122	state->srr1 = (unsigned int)saved_state->save_srr1;
	123	state->r0 = (unsigned int)saved_state->save_r0;
	124	state->r1 = (unsigned int)saved_state->save_r1;
	125	state->r2 = (unsigned int)saved_state->save_r2;
	126	state->r3 = (unsigned int)saved_state->save_r3;
	127	state->r4 = (unsigned int)saved_state->save_r4;
	128	state->r5 = (unsigned int)saved_state->save_r5;
	129	state->r6 = (unsigned int)saved_state->save_r6;
	130	state->r7 = (unsigned int)saved_state->save_r7;
	131	state->r8 = (unsigned int)saved_state->save_r8;
	132	state->r9 = (unsigned int)saved_state->save_r9;
	133	state->r10 = (unsigned int)saved_state->save_r10;
	134	state->r11 = (unsigned int)saved_state->save_r11;
	135	state->r12 = (unsigned int)saved_state->save_r12;
	136	state->r13 = (unsigned int)saved_state->save_r13;
	137	state->r14 = (unsigned int)saved_state->save_r14;
	138	state->r15 = (unsigned int)saved_state->save_r15;
	139	state->r16 = (unsigned int)saved_state->save_r16;
	140	state->r17 = (unsigned int)saved_state->save_r17;
	141	state->r18 = (unsigned int)saved_state->save_r18;
	142	state->r19 = (unsigned int)saved_state->save_r19;
	143	state->r20 = (unsigned int)saved_state->save_r20;
	144	state->r21 = (unsigned int)saved_state->save_r21;
	145	state->r22 = (unsigned int)saved_state->save_r22;
	146	state->r23 = (unsigned int)saved_state->save_r23;
	147	state->r24 = (unsigned int)saved_state->save_r24;
	148	state->r25 = (unsigned int)saved_state->save_r25;
	149	state->r26 = (unsigned int)saved_state->save_r26;
	150	state->r27 = (unsigned int)saved_state->save_r27;
	151	state->r28 = (unsigned int)saved_state->save_r28;
	152	state->r29 = (unsigned int)saved_state->save_r29;
	153	state->r30 = (unsigned int)saved_state->save_r30;
	154	state->r31 = (unsigned int)saved_state->save_r31;
	155	state->cr = (unsigned int)saved_state->save_cr;
	156	state->xer = (unsigned int)saved_state->save_xer;
	157	state->lr = (unsigned int)saved_state->save_lr;
	158	state->ctr = (unsigned int)saved_state->save_ctr;
	159	}
	160
	161	static void
	162	kdp_getintegerstate64(
	163	struct ppc_thread_state64 *state
	164	)
	165	{
	166	struct savearea *saved_state;
	167
	168	saved_state = kdp.saved_state;
	169
	170	bzero((char *)state,sizeof (struct ppc_thread_state64)) ;
	171
	172	state->srr0 = saved_state->save_srr0;
	173	state->srr1 = saved_state->save_srr1;
	174	state->r0 = saved_state->save_r0;
	175	state->r1 = saved_state->save_r1;
	176	state->r2 = saved_state->save_r2;
	177	state->r3 = saved_state->save_r3;
	178	state->r4 = saved_state->save_r4;
	179	state->r5 = saved_state->save_r5;
	180	state->r6 = saved_state->save_r6;
	181	state->r7 = saved_state->save_r7;
	182	state->r8 = saved_state->save_r8;
	183	state->r9 = saved_state->save_r9;
	184	state->r10 = saved_state->save_r10;
	185	state->r11 = saved_state->save_r11;
	186	state->r12 = saved_state->save_r12;
	187	state->r13 = saved_state->save_r13;
	188	state->r14 = saved_state->save_r14;
	189	state->r15 = saved_state->save_r15;
	190	state->r16 = saved_state->save_r16;
	191	state->r17 = saved_state->save_r17;
	192	state->r18 = saved_state->save_r18;
	193	state->r19 = saved_state->save_r19;
	194	state->r20 = saved_state->save_r20;
	195	state->r21 = saved_state->save_r21;
	196	state->r22 = saved_state->save_r22;
	197	state->r23 = saved_state->save_r23;
	198	state->r24 = saved_state->save_r24;
	199	state->r25 = saved_state->save_r25;
	200	state->r26 = saved_state->save_r26;
	201	state->r27 = saved_state->save_r27;
	202	state->r28 = saved_state->save_r28;
	203	state->r29 = saved_state->save_r29;
	204	state->r30 = saved_state->save_r30;
	205	state->r31 = saved_state->save_r31;
	206	state->cr = saved_state->save_cr;
	207	state->xer = saved_state->save_xer;
	208	state->lr = saved_state->save_lr;
	209	state->ctr = saved_state->save_ctr;
	210	}
	211
	212	kdp_error_t
	213	kdp_machine_read_regs(
	214	unsigned int cpu,
	215	unsigned int flavor,
	216	char *data,
	217	int *size
	218	)
	219	{
	220	switch (flavor) {
	221
	222	case PPC_THREAD_STATE:
	223	dprintf(("kdp_readregs THREAD_STATE\n"));
	224	kdp_getintegerstate((struct ppc_thread_state *)data);
	225	size = PPC_THREAD_STATE_COUNT sizeof(int);
	226	return KDPERR_NO_ERROR;
	227
	228	case PPC_THREAD_STATE64:
	229	dprintf(("kdp_readregs THREAD_STATE\n"));
	230	kdp_getintegerstate64((struct ppc_thread_state64 *)data);
	231	size = PPC_THREAD_STATE64_COUNT sizeof(int);
	232	return KDPERR_NO_ERROR;
	233
	234	case PPC_FLOAT_STATE:
	235	dprintf(("kdp_readregs THREAD_FPSTATE\n"));
	236	bzero((char *)data ,sizeof(struct ppc_float_state));
	237	size = PPC_FLOAT_STATE_COUNT sizeof(int);
	238	return KDPERR_NO_ERROR;
	239
	240	default:
	241	dprintf(("kdp_readregs bad flavor %d\n"));
	242	return KDPERR_BADFLAVOR;
	243	}
	244	}
	245
	246	static void
	247	kdp_setintegerstate(
	248	struct ppc_thread_state *state
	249	)
	250	{
	251	struct savearea *saved_state;
	252
	253	saved_state = kdp.saved_state;
	254
	255	saved_state->save_srr0 = state->srr0;
	256	saved_state->save_srr1 = state->srr1;
	257	saved_state->save_r0 = state->r0;
	258	saved_state->save_r1 = state->r1;
	259	saved_state->save_r2 = state->r2;
	260	saved_state->save_r3 = state->r3;
	261	saved_state->save_r4 = state->r4;
	262	saved_state->save_r5 = state->r5;
	263	saved_state->save_r6 = state->r6;
	264	saved_state->save_r7 = state->r7;
	265	saved_state->save_r8 = state->r8;
	266	saved_state->save_r9 = state->r9;
	267	saved_state->save_r10 = state->r10;
	268	saved_state->save_r11 = state->r11;
	269	saved_state->save_r12 = state->r12;
	270	saved_state->save_r13 = state->r13;
	271	saved_state->save_r14 = state->r14;
	272	saved_state->save_r15 = state->r15;
	273	saved_state->save_r16 = state->r16;
	274	saved_state->save_r17 = state->r17;
	275	saved_state->save_r18 = state->r18;
	276	saved_state->save_r19 = state->r19;
	277	saved_state->save_r20 = state->r20;
	278	saved_state->save_r21 = state->r21;
	279	saved_state->save_r22 = state->r22;
	280	saved_state->save_r23 = state->r23;
	281	saved_state->save_r24 = state->r24;
	282	saved_state->save_r25 = state->r25;
	283	saved_state->save_r26 = state->r26;
	284	saved_state->save_r27 = state->r27;
	285	saved_state->save_r28 = state->r28;
	286	saved_state->save_r29 = state->r29;
	287	saved_state->save_r30 = state->r30;
	288	saved_state->save_r31 = state->r31;
	289	saved_state->save_cr = state->cr;
	290	saved_state->save_xer = state->xer;
	291	saved_state->save_lr = state->lr;
	292	saved_state->save_ctr = state->ctr;
	293	}
	294
	295	static void
	296	kdp_setintegerstate64(
	297	struct ppc_thread_state64 *state
	298	)
	299	{
	300	struct savearea *saved_state;
	301
	302	saved_state = kdp.saved_state;
	303
	304	saved_state->save_srr0 = state->srr0;
	305	saved_state->save_srr1 = state->srr1;
	306	saved_state->save_r0 = state->r0;
	307	saved_state->save_r1 = state->r1;
	308	saved_state->save_r2 = state->r2;
	309	saved_state->save_r3 = state->r3;
	310	saved_state->save_r4 = state->r4;
	311	saved_state->save_r5 = state->r5;
	312	saved_state->save_r6 = state->r6;
	313	saved_state->save_r7 = state->r7;
	314	saved_state->save_r8 = state->r8;
	315	saved_state->save_r9 = state->r9;
	316	saved_state->save_r10 = state->r10;
	317	saved_state->save_r11 = state->r11;
	318	saved_state->save_r12 = state->r12;
	319	saved_state->save_r13 = state->r13;
	320	saved_state->save_r14 = state->r14;
	321	saved_state->save_r15 = state->r15;
	322	saved_state->save_r16 = state->r16;
	323	saved_state->save_r17 = state->r17;
	324	saved_state->save_r18 = state->r18;
	325	saved_state->save_r19 = state->r19;
	326	saved_state->save_r20 = state->r20;
	327	saved_state->save_r21 = state->r21;
	328	saved_state->save_r22 = state->r22;
	329	saved_state->save_r23 = state->r23;
	330	saved_state->save_r24 = state->r24;
	331	saved_state->save_r25 = state->r25;
	332	saved_state->save_r26 = state->r26;
	333	saved_state->save_r27 = state->r27;
	334	saved_state->save_r28 = state->r28;
	335	saved_state->save_r29 = state->r29;
	336	saved_state->save_r30 = state->r30;
	337	saved_state->save_r31 = state->r31;
	338	saved_state->save_cr = state->cr;
	339	saved_state->save_xer = state->xer;
	340	saved_state->save_lr = state->lr;
	341	saved_state->save_ctr = state->ctr;
	342	}
	343
	344	kdp_error_t
	345	kdp_machine_write_regs(
	346	unsigned int cpu,
	347	unsigned int flavor,
	348	char *data,
	349	int *size
	350	)
	351	{
	352	switch (flavor) {
	353
	354	case PPC_THREAD_STATE:
	355	dprintf(("kdp_writeregs THREAD_STATE\n"));
	356	kdp_setintegerstate((struct ppc_thread_state *)data);
	357
	358	#if KDP_TEST_HARNESS
	359	DumpTheSave((struct savearea )data); / (TEST/DEBUG) */
	360	#endif
	361	return KDPERR_NO_ERROR;
	362
	363	case PPC_THREAD_STATE64:
	364	dprintf(("kdp_writeregs THREAD_STATE64\n"));
	365	kdp_setintegerstate64((struct ppc_thread_state64 *)data);
	366
	367	#if KDP_TEST_HARNESS
	368	DumpTheSave((struct savearea )data); / (TEST/DEBUG) */
	369	#endif
	370	return KDPERR_NO_ERROR;
	371	case PPC_FLOAT_STATE:
	372	dprintf(("kdp_writeregs THREAD_FPSTATE\n"));
	373	return KDPERR_NO_ERROR;
	374
	375	default:
	376	dprintf(("kdp_writeregs bad flavor %d\n"));
	377	return KDPERR_BADFLAVOR;
	378	}
	379	}
	380
	381	void
	382	kdp_machine_hostinfo(
	383	kdp_hostinfo_t *hostinfo
	384	)
	385	{
	386	int i;
	387
	388	hostinfo->cpus_mask = 0;
	389	hostinfo->cpu_type = 0;
	390
	391	for (i = 0; i < machine_info.max_cpus; i++) {
	392	if ((PerProcTable[i].ppe_vaddr == (struct per_proc_info *)NULL) \|\|
	393	!(PerProcTable[i].ppe_vaddr->running))
	394	continue;
	395
	396	hostinfo->cpus_mask \|= (1 << i);
	397	if (hostinfo->cpu_type == 0) {
	398	hostinfo->cpu_type = slot_type(i);
	399	hostinfo->cpu_subtype = slot_subtype(i);
	400	}
	401	}
	402	}
	403
	404	void
	405	kdp_panic(
	406	const char *msg
	407	)
	408	{
	409	printf("kdp panic: %s\n", msg);
	410	while(1) {}
	411	}
	412
	413
	414	void
	415	kdp_reboot(void)
	416	{
	417	printf("Attempting system restart...");
	418	/* Call the platform specific restart*/
	419	if (PE_halt_restart)
	420	(*PE_halt_restart)(kPERestartCPU);
	421	/* If we do reach this, give up */
	422	halt_all_cpus(TRUE);
	423	}
	424
	425	int
	426	kdp_intr_disbl(void)
	427	{
	428	return (splhigh());
	429	}
	430
	431	void
	432	kdp_intr_enbl(int s)
	433	{
	434	splx(s);
	435	}
	436
	437	void
	438	kdp_us_spin(int usec)
	439	{
	440	extern void delay(int);
	441
	442	delay(usec/100);
	443	}
	444
	445	void print_saved_state(void *state)
	446	{
	447	struct ppc_thread_state *saved_state;
	448
	449	saved_state = state;
	450
	451	printf("pc = 0x%x\n", saved_state->srr0);
	452	printf("msr = 0x%x\n", saved_state->srr1);
	453	printf("rp = 0x%x\n", saved_state->lr);
	454	printf("sp = 0x%x\n", saved_state->r1);
	455
	456	}
	457
	458	void
	459	kdp_call()
	460	{
	461	Debugger("inline call to debugger(machine_startup)");
	462	}
	463
	464	/*
	465	* table to convert system specific code to generic codes for kdb
	466	*/
	467	int kdp_trap_codes[] = {
	468	EXC_BAD_ACCESS, /* 0x0000 INVALID EXCEPTION */
	469	EXC_BAD_ACCESS, /* 0x0100 System reset */
	470	EXC_BAD_ACCESS, /* 0x0200 Machine check */
	471	EXC_BAD_ACCESS, /* 0x0300 Data access */
	472	EXC_BAD_ACCESS, /* 0x0400 Instruction access */
	473	EXC_BAD_ACCESS, /* 0x0500 External interrupt */
	474	EXC_BAD_ACCESS, /* 0x0600 Alignment */
	475	EXC_BREAKPOINT, /* 0x0700 Program - fp exc, ill/priv instr, trap */
	476	EXC_ARITHMETIC, /* 0x0800 Floating point disabled */
	477	EXC_SOFTWARE, /* 0x0900 Decrementer */
	478	EXC_BAD_ACCESS, /* 0x0A00 I/O controller interface */
	479	EXC_BAD_ACCESS, /* 0x0B00 INVALID EXCEPTION */
	480	EXC_SOFTWARE, /* 0x0C00 System call exception */
	481	EXC_BREAKPOINT, /* 0x0D00 Trace */
	482	EXC_SOFTWARE, /* 0x0E00 FP assist */
	483	EXC_SOFTWARE, /* 0x0F00 Performance monitoring */
	484	EXC_ARITHMETIC, /* 0x0F20 Altivec disabled */
	485	EXC_BAD_ACCESS, /* 0x1000 Instruction PTE miss */
	486	EXC_BAD_ACCESS, /* 0x1100 Data load PTE miss */
	487	EXC_BAD_ACCESS, /* 0x1200 Data store PTE miss */
	488	EXC_BREAKPOINT, /* 0x1300 Instruction bkpt */
	489	EXC_SOFTWARE, /* 0x1400 System management */
	490	EXC_BAD_ACCESS, /* 0x1500 INVALID EXCEPTION */
	491	EXC_ARITHMETIC, /* 0x1600 Altivec Assist */
	492	EXC_BAD_ACCESS, /* 0x1700 INVALID EXCEPTION */
	493	EXC_BAD_ACCESS, /* 0x1800 INVALID EXCEPTION */
	494	EXC_BAD_ACCESS, /* 0x1900 INVALID EXCEPTION */
	495	EXC_BAD_ACCESS, /* 0x1A00 INVALID EXCEPTION */
	496	EXC_BAD_ACCESS, /* 0x1B00 INVALID EXCEPTION */
	497	EXC_BAD_ACCESS, /* 0x1C00 INVALID EXCEPTION */
	498	EXC_BAD_ACCESS, /* 0x1D00 INVALID EXCEPTION */
	499	EXC_BAD_ACCESS, /* 0x1E00 INVALID EXCEPTION */
	500	EXC_BAD_ACCESS, /* 0x1F00 INVALID EXCEPTION */
	501	EXC_BREAKPOINT, /* 0x2000 Run Mode/Trace */
	502	EXC_BAD_ACCESS, /* 0x2100 INVALID EXCEPTION */
	503	EXC_BAD_ACCESS, /* 0x2200 INVALID EXCEPTION */
	504	EXC_BAD_ACCESS, /* 0x2300 INVALID EXCEPTION */
	505	EXC_BAD_ACCESS, /* 0x2400 INVALID EXCEPTION */
	506	EXC_BAD_ACCESS, /* 0x2500 INVALID EXCEPTION */
	507	EXC_BAD_ACCESS, /* 0x2600 INVALID EXCEPTION */
	508	EXC_BAD_ACCESS, /* 0x2700 INVALID EXCEPTION */
	509	EXC_BAD_ACCESS, /* 0x2800 INVALID EXCEPTION */
	510	EXC_BAD_ACCESS, /* 0x2900 INVALID EXCEPTION */
	511	EXC_BAD_ACCESS, /* 0x2A00 INVALID EXCEPTION */
	512	EXC_BAD_ACCESS, /* 0x2B00 INVALID EXCEPTION */
	513	EXC_BAD_ACCESS, /* 0x2C00 INVALID EXCEPTION */
	514	EXC_BAD_ACCESS, /* 0x2D00 INVALID EXCEPTION */
	515	EXC_BAD_ACCESS, /* 0x2E00 INVALID EXCEPTION */
	516	EXC_BAD_ACCESS, /* 0x2F00 INVALID EXCEPTION */
	517	EXC_SOFTWARE /* 0x3000 AST trap (software) */
	518	};
	519
	520	int
	521	kdp_getc()
	522	{
	523	return(cnmaygetc());
	524	}
	525
	526	int kdp_backtrace;
	527	int kdp_sr_dump;
	528	int kdp_dabr;
	529	int kdp_noisy;
	530
	531	#define kdp_code(x) kdp_trap_codes[((x)==T_AST?0x31:(x)/T_VECTOR_SIZE)]
	532
	533	void
	534	kdp_trap(
	535	unsigned int exception,
	536	struct savearea *saved_state
	537	)
	538	{
	539	unsigned int *fp;
	540	unsigned int sp;
	541	struct savearea *state;
	542
	543	if (kdp_noisy) {
	544	if (kdp_backtrace) {
	545	printf("\nvector=%x, \n", exception/4);
	546	sp = saved_state->save_r1;
	547	printf("stack backtrace - sp(%x) ", sp);
	548	fp = (unsigned int ) ((unsigned int *)sp);
	549	while (fp) {
	550	printf("0x%08x ", fp[2]);
	551	fp = (unsigned int )fp;
	552	}
	553	printf("\n");
	554	}
	555	#ifdef XXX
	556	if (kdp_sr_dump) {
	557	dump_segment_registers();
	558	}
	559	#endif
	560
	561	printf("vector=%d ", exception/4);
	562	}
	563	kdp_raise_exception(kdp_code(exception), 0, 0, saved_state);
	564
	565	if (kdp_noisy)
	566	printf("kdp_trap: kdp_raise_exception() ret\n");
	567
	568	if ((unsigned int)(saved_state->save_srr0) == 0x7c800008)
	569	saved_state->save_srr0 += 4; /* BKPT_SIZE */
	570
	571	if(saved_state->save_srr1 & (MASK(MSR_SE) \| MASK(MSR_BE))) { /* Are we just stepping or continuing */
	572	db_run_mode = STEP_ONCE; /* We are stepping */
	573	}
	574	else db_run_mode = STEP_CONTINUE; /* Otherwise we are continuing */
	575
	576	#ifdef XXX
	577	mtspr(dabr, kdp_dabr);
	578	#endif
	579	}
	580
	581	boolean_t
	582	kdp_call_kdb(
	583	void)
	584	{
	585	switch_debugger=1;
	586	return(TRUE);
	587	}
	588
	589	void kdp_print_registers(struct savearea *state)
	590	{
	591	int i;
	592	for (i=0; i<32; i++) {
	593	if ((i % 8) == 0)
	594	printf("\n%4d :",i);
	595	printf(" %08x",*(&state->save_r0+i));
	596	}
	597	printf("\n");
	598	printf("cr = 0x%08x\t\t",state->save_cr);
	599	printf("xer = 0x%08x\n",state->save_xer);
	600	printf("lr = 0x%08x\t\t",state->save_lr);
	601	printf("ctr = 0x%08x\n",state->save_ctr);
	602	printf("srr0(iar) = 0x%08x\t\t",state->save_srr0);
	603	printf("srr1(msr) = 0x%08B\n",state->save_srr1,
	604	"\x10\x11""EE\x12PR\x13""FP\x14ME\x15""FE0\x16SE\x18"
	605	"FE1\x19""AL\x1a""EP\x1bIT\x1c""DT");
	606	printf("\n");
	607	}
	608
	609	void
	610	kdp_print_backtrace(
	611	unsigned int exception,
	612	struct savearea *saved_state)
	613	{
	614	extern void kdp_print_registers(struct savearea *);
	615	extern void print_backtrace(struct savearea *);
	616
	617	disableDebugOuput = FALSE;
	618	debug_mode = TRUE;
	619	printf("re-entering kdp:\n");
	620	printf("vector=%x, \n", exception/4);
	621	kdp_print_registers(saved_state);
	622	print_backtrace(saved_state);
	623	printf("panic: We are hanging here...\n");
	624	while(1);
	625	}
	626
	627	unsigned int kdp_ml_get_breakinsn(void)
	628	{
	629	return 0x7fe00008;
	630	}