summaryrefslogtreecommitdiffstatshomepage
path: root/src/emu/cpu/dsp32/dsp32dis.c
blob: d748df49f95dd19cf3042a3cf25e770db5dfd524 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
/***************************************************************************

    dsp32dis.c
    Disassembler for the portable AT&T/Lucent DSP32C emulator.
    Written by Aaron Giles

***************************************************************************/

#include "dsp32.h"


/***************************************************************************
    MEMORY ACCESSORS
***************************************************************************/

#define ROPCODE(pc)		cpu_readop32(pc)

#define ABS(x) (((x) >= 0) ? (x) : -(x))


/***************************************************************************
    CODE CODE
***************************************************************************/

static const char *const sizesuffix[] = { "", "e" };
static const char *const unarysign[] = { "", "-" };
static const char *const sign[] = { "+", "-" };
static const char *const aMvals[] = { "a0", "a1", "a2", "a3", "0.0", "1.0", "Format 4", "Reserved" };
static const char *const memsuffix[] = { "h", "l", "", "e" };
static const char *const functable[] =
{
	"ic", "oc", "float", "int", "round", "ifalt", "ifaeq", "ifagt",
	"reserved8", "reserved9", "float24", "int24", "ieee", "dsp", "seed", "reservedf"
};
static const char *const condtable[] =
{
	"false", "true",
	"pl", "mi",
	"ne", "eq",
	"vc", "vs",
	"cc", "cs",
	"ge", "lt",
	"gt", "le",
	"hi", "ls",
	"auc", "aus",
	"age", "alt",
	"ane", "aeq",
	"avc", "avs",
	"agt", "ale",
	"!resd", "resd",
	"!rese", "rese",
	"!resf", "resf",
	"ibe", "ibf",
	"obf", "obe",
	"pde", "pdf",
	"pie", "pif",
	"syc", "sys",
	"fbc", "fbs",
	"ireq1_lo", "ireq1_hi",
	"ireq2_lo", "ireq2_hi",
	"!?18", "?18",
	"!?19", "?19",
	"!?1a", "?1a",
	"!?1b", "?1b",
	"!?1c", "?1c",
	"!?1d", "?1d",
	"!?1e", "?1e",
	"!?1f", "?1f"
};
static const char *const regname[] =
{
	"0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
	"r8", "r9", "r10", "r11", "r12", "r13", "r14", "pc",
	"0", "r15", "r16", "r17", "r18", "r19", "-1", "1",
	"r20", "r21", "dauc", "ioc", "res1c", "r22", "pcsh", "res1f"
};
static const char *const regnamee[] =
{
	"0", "r1e", "r2e", "r3e", "r4e", "r5e", "r6e", "r7e",
	"r8e", "r9e", "r10e", "r11e", "r12e", "r13e", "r14e", "pce",
	"0", "r15e", "r16e", "r17e", "r18e", "r19e", "--", "++",
	"r20e", "r21e", "dauce", "ioce", "res1ce", "r22e", "pcshe", "res1fe"
};

static char tempbuf[10][40];

INLINE char *signed_16bit_unary(INT16 val)
{
	static char temp[10];
	if (val < 0)
		sprintf(temp, "-$%x", -val);
	else
		sprintf(temp, "$%x", val);
	return temp;
}

INLINE char *signed_16bit_sep(INT16 val)
{
	static char temp[10];
	if (val < 0)
		sprintf(temp, " - $%x", -val);
	else
		sprintf(temp, " + $%x", val);
	return temp;
}

INLINE char *signed_16bit_sep_nospace(INT16 val)
{
	static char temp[10];
	if (val < 0)
		sprintf(temp, "-$%x", -val);
	else
		sprintf(temp, "+$%x", val);
	return temp;
}

INLINE char *unsigned_16bit_size(INT16 val, UINT8 size)
{
	static char temp[10];
	if (size)
		sprintf(temp, "$%06x", (INT32)val & 0xffffff);
	else
		sprintf(temp, "$%04x", val & 0xffff);
	return temp;
}

static UINT8 lastp;
static const char *dasm_XYZ(UINT8 bits, char *buffer)
{
	UINT8 p = bits >> 3;
	UINT8 i = bits & 7;

	if (p)
	{
		if (p == 15) p = lastp;		/* P=15 means Z inherits from Y, Y inherits from X */
		lastp = p;
		switch (i)
		{
			case 0:		sprintf(buffer, "*r%d", p);	break;
			case 1:
			case 2:
			case 3:
			case 4:
			case 5:		sprintf(buffer, "*r%d++r%d", p, i + 14); break;
			case 6:		sprintf(buffer, "*r%d--", p); break;
			case 7:		sprintf(buffer, "*r%d++", p); break;
		}
	}
	else
	{
		switch (i)
		{
			case 0:
			case 1:
			case 2:
			case 3:		sprintf(buffer, "a%d", i); break;
			case 4:		sprintf(buffer, "ibuf"); break;
			case 5:		sprintf(buffer, "obuf"); break;
			case 6:		sprintf(buffer, "pdr"); break;
			case 7:		buffer[0] = 0; break;
		}
	}
	return buffer;
}


static const char *dasm_PI(UINT16 bits, char *buffer)
{
	UINT8 p = bits >> 5;
	UINT8 i = bits & 0x1f;

	if (p)
	{
		switch (i)
		{
			case 0:
			case 16:	sprintf(buffer, "*%s", regname[p]);	break;
			case 22:	sprintf(buffer, "*%s--", regname[p]); break;
			case 23:	sprintf(buffer, "*%s++", regname[p]); break;
			default:	sprintf(buffer, "*%s++%s", regname[p], regname[i]); break;
		}
	}
	else
	{
		switch (i)
		{
			case 4:		sprintf(buffer, "ibuf"); break;
			case 5:		sprintf(buffer, "obuf"); break;
			case 6:		sprintf(buffer, "pdr"); break;
			case 14:	sprintf(buffer, "piop"); break;
			case 20:	sprintf(buffer, "pdr2"); break;
			case 22:	sprintf(buffer, "pir"); break;
			case 30:	sprintf(buffer, "pcw"); break;
			default:	sprintf(buffer, "????"); break;
		}
	}
	return buffer;
}


unsigned dasm_dsp32(char *buffer, unsigned pc, UINT32 op)
{
	UINT32 flags = 0;

	switch (op >> 25)
	{
		/* DA format 1 */
		case 0x10:	case 0x11:	case 0x12:	case 0x13:
		case 0x14:	case 0x15:	case 0x16:	case 0x17:
		case 0x18:	case 0x19:	case 0x1a:	case 0x1b:
		{
			const char *X = dasm_XYZ((op >> 14) & 0x7f, tempbuf[0]);
			const char *Y = dasm_XYZ((op >> 7) & 0x7f, tempbuf[1]);
			const char *Z = dasm_XYZ((op >> 0) & 0x7f, tempbuf[2]);
			const char *aM = aMvals[(op >> 26) & 7];
			UINT8 aN = (op >> 21) & 3;
			if ((op & 0x7f) == 7)
			{
				if (aM[0] == '0')
					sprintf(buffer, "a%d = %s%s", aN, unarysign[(op >> 24) & 1], Y);
				else if (aM[0] == '1')
					sprintf(buffer, "a%d = %s%s %s %s", aN, unarysign[(op >> 24) & 1], Y, sign[(op >> 23) & 1], X);
				else
					sprintf(buffer, "a%d = %s%s %s %s * %s", aN, unarysign[(op >> 24) & 1], Y, sign[(op >> 23) & 1], aM, X);
			}
			else
			{
				if (aM[0] == '0')
					sprintf(buffer, "%s = a%d = %s%s", Z, aN, unarysign[(op >> 24) & 1], Y);
				else if (aM[0] == '1')
					sprintf(buffer, "%s = a%d = %s%s %s %s", Z, aN, unarysign[(op >> 24) & 1], Y, sign[(op >> 23) & 1], X);
				else
					sprintf(buffer, "%s = a%d = %s%s %s %s * %s", Z, aN, unarysign[(op >> 24) & 1], Y, sign[(op >> 23) & 1], aM, X);
			}
			break;
		}

		/* DA format 2 */
		case 0x20:	case 0x21:	case 0x22:	case 0x23:
		case 0x24:	case 0x25:	case 0x26:	case 0x27:
		case 0x28:	case 0x29:	case 0x2a:	case 0x2b:
		{
			const char *X = dasm_XYZ((op >> 14) & 0x7f, tempbuf[0]);
			const char *Y = dasm_XYZ((op >> 7) & 0x7f, tempbuf[1]);
			const char *Z = dasm_XYZ((op >> 0) & 0x7f, tempbuf[2]);
			const char *aM = aMvals[(op >> 26) & 7];
			UINT8 aN = (op >> 21) & 3;

			if ((op & 0x7f) == 7)
			{
				if (aM[0] == '0')
					sprintf(buffer, "a%d = %s%s * %s", aN, unarysign[(op >> 23) & 1], Y, X);
				else
					sprintf(buffer, "a%d = %s%s %s %s * %s", aN, unarysign[(op >> 24) & 1], aM, sign[(op >> 23) & 1], Y, X);
			}
			else
			{
				if (aM[0] == '0')
					sprintf(buffer, "a%d = %s(%s=%s) * %s", aN, unarysign[(op >> 23) & 1], Z, Y, X);
				else
					sprintf(buffer, "a%d = %s%s %s (%s=%s) * %s", aN, unarysign[(op >> 24) & 1], aM, sign[(op >> 23) & 1], Z, Y, X);
			}
			break;
		}

		/* DA format 3 */
		case 0x30:	case 0x31:	case 0x32:	case 0x33:
		case 0x34:	case 0x35:	case 0x36:	case 0x37:
		case 0x38:	case 0x39:	case 0x3a:	case 0x3b:
		{
			const char *X = dasm_XYZ((op >> 14) & 0x7f, tempbuf[0]);
			const char *Y = dasm_XYZ((op >> 7) & 0x7f, tempbuf[1]);
			const char *Z = dasm_XYZ((op >> 0) & 0x7f, tempbuf[2]);
			const char *aM = aMvals[(op >> 26) & 7];
			UINT8 aN = (op >> 21) & 3;

			if ((op & 0x7f) == 7)
			{
				if (aM[0] == '0')
					sprintf(buffer, "a%d = %s%s * %s", aN, unarysign[(op >> 23) & 1], Y, X);
				else
					sprintf(buffer, "a%d = %s%s %s %s * %s", aN, unarysign[(op >> 24) & 1], aM, sign[(op >> 23) & 1], Y, X);
			}
			else
			{
				if (aM[0] == '0')
					sprintf(buffer, "%s = a%d = %s%s * %s", Z, aN, unarysign[(op >> 23) & 1], Y, X);
				else
					sprintf(buffer, "%s = a%d = %s%s %s %s * %s", Z, aN, unarysign[(op >> 24) & 1], aM, sign[(op >> 23) & 1], Y, X);
			}
			break;
		}

		/* DA format 4 */
		case 0x1c:	case 0x1d:
		{
			const char *X = dasm_XYZ((op >> 14) & 0x7f, tempbuf[0]);
			const char *Y = dasm_XYZ((op >> 7) & 0x7f, tempbuf[1]);
			const char *Z = dasm_XYZ((op >> 0) & 0x7f, tempbuf[2]);
			UINT8 aN = (op >> 21) & 3;

			if ((op & 0x7f) == 7)
				sprintf(buffer, "a%d = %s%s %s %s", aN, unarysign[(op >> 24) & 1], Y, sign[(op >> 23) & 1], X);
			else
				sprintf(buffer, "a%d = %s(%s=%s) %s %s", aN, unarysign[(op >> 24) & 1], Z, Y, sign[(op >> 23) & 1], X);
			break;
		}

		/* DA format 5 */
		case 0x3c:	case 0x3d:	case 0x3e:	case 0x3f:
			if ((op & 0x7f) == 7)
				sprintf(buffer, "a%d = %s(%s)",
						(op >> 21) & 3, 							// aN
						functable[(op >> 23) & 15],					// G
						dasm_XYZ((op >> 7) & 0x7f, tempbuf[0]));	// Y
			else
				sprintf(buffer, "%s = a%d = %s(%s)",
						dasm_XYZ((op >> 0) & 0x7f, tempbuf[2]),		// Z
						(op >> 21) & 3, 							// aN
						functable[(op >> 23) & 15],					// G
						dasm_XYZ((op >> 7) & 0x7f, tempbuf[0]));	// Y
			break;

		/* CA formats 0/1 */
		case 0x00:	case 0x01:	case 0x02:	case 0x03:
		{
			const char *rH = regname[(op >> 16) & 0x1f];
			UINT8 C = (op >> 21) & 0x3f;
			INT16 N = (INT16)op;

			if (op == 0)
				sprintf(buffer, "nop");
			else if (C == 1 && N == 0 && ((op >> 16) & 0x1f) == 0x1e)
				sprintf(buffer, "ireturn");
			else if (C == 1)
			{
				if (((op >> 16) & 0x1f) == 15)
					sprintf(buffer, "goto %s%s [%x]", rH, signed_16bit_sep_nospace(N), (pc + 8 + N) & 0xffffff);
				else if (N && rH[0] != '0')
					sprintf(buffer, "goto %s%s", rH, signed_16bit_sep_nospace(N));
				else if (N)
					sprintf(buffer, "goto $%x", ((INT32)N & 0xffffff));
				else
				{
					if (((op >> 16) & 0x1f) == 20)
						flags = DASMFLAG_STEP_OUT;
					sprintf(buffer, "goto %s", rH);
				}
			}
			else
			{
				if (((op >> 16) & 0x1f) == 15)
					sprintf(buffer, "if (%s) goto %s%s [%x]", condtable[C], rH, signed_16bit_sep_nospace(N), (pc + 8 + N) & 0xffffff);
				else if (N && rH[0] != '0')
					sprintf(buffer, "if (%s) goto %s%s", condtable[C], rH, signed_16bit_sep_nospace(N));
				else if (N)
					sprintf(buffer, "if (%s) goto $%x", condtable[C], ((INT32)N & 0xffffff));
				else
				{
					if (((op >> 16) & 0x1f) == 20)
						flags = DASMFLAG_STEP_OUT;
					sprintf(buffer, "if (%s) goto %s", condtable[C], rH);
				}
			}
			break;
		}

		/* CA format 3a */
		case 0x06:	case 0x07:
		{
			const char *rH = regname[(op >> 16) & 0x1f];
			const char *rM = regname[(op >> 21) & 0x1f];
			INT16 N = (INT16)op;

			if (((op >> 16) & 0x1f) == 15)
			{
				sprintf(buffer, "if (%s-- >= 0) goto %s%s [%x]", rM, rH, signed_16bit_sep_nospace(N), (pc + 8 + N) & 0xffffff);
				if (((pc + 8 + N) & 0xffffff) < pc)
					flags = DASMFLAG_STEP_OVER;
			}
			else if (N && rH[0] != '0')
				sprintf(buffer, "if (%s-- >= 0) goto %s%s", rM, rH, signed_16bit_sep_nospace(N));
			else if (N)
			{
				sprintf(buffer, "if (%s-- >= 0) goto $%x", rM, ((INT32)N & 0xffffff));
				if (((INT32)N & 0xffffff) < pc)
					flags = DASMFLAG_STEP_OVER;
			}
			else
			{
				sprintf(buffer, "if (%s-- >= 0) goto %s", rM, rH);
				if (((op >> 16) & 0x1f) == 20)
					flags = DASMFLAG_STEP_OUT;
			}
			break;
		}

		/* CA format 3b/3c */
		case 0x46:
			if (((op >> 21) & 0x1f) == 0)
				sprintf(buffer, "do %d,%d", (op >> 16) & 0x1f, op & 0x7ff);
			else if (((op >> 21) & 0x1f) == 1)
				sprintf(buffer, "do %d,%s", (op >> 16) & 0x1f, regname[op & 0x1f]);
			break;

		/* CA format 4 */
		case 0x08:	case 0x09:
		{
			const char *rH = regname[(op >> 16) & 0x1f];
			const char *rM = regname[(op >> 21) & 0x1f];
			INT16 N = (INT16)op;

			if (((op >> 16) & 0x1f) == 15)
				sprintf(buffer, "call %s%s (%s) [%x]", rH, signed_16bit_sep_nospace(N), rM, (pc + 8 + N) & 0xffffff);
			else if (N && rH[0] != '0')
				sprintf(buffer, "call %s%s (%s)", rH, signed_16bit_sep_nospace(N), rM);
			else if (N)
				sprintf(buffer, "call $%x (%s)", ((INT32)N & 0xffffff), rM);
			else
				sprintf(buffer, "call %s (%s)", rH, rM);
			flags = DASMFLAG_STEP_OVER | DASMFLAG_STEP_OVER_EXTRA(1);
			break;
		}

		/* CA format 5a/5b */
		case 0x0a:	case 0x0b:
		case 0x4a:	case 0x4b:
		{
			const char *rD = regname[(op >> 21) & 0x1f];
			const char *rH = regname[(op >> 16) & 0x1f];
			const char *s = sizesuffix[(op >> 31) & 1];
			INT16 N = (INT16)op;
			if (N == 0)
				sprintf(buffer, "%s%s = %s%s", rD, s, rH, s);
			else if (rH[0] == '0')
				sprintf(buffer, "%s%s = %s", rD, s, signed_16bit_unary(N));
			else
				sprintf(buffer, "%s%s = %s%s%s", rD, s, rH, s, signed_16bit_sep((INT16)op));
			break;
		}

		/* CA format 6a/6b */
		case 0x0c:	case 0x4c:
		{
			const char *rD = regname[(op >> 16) & 0x1f];
			const char *rS1 = regname[(op >> 5) & 0x1f];
			const char *rS2 = regname[(op >> 0) & 0x1f];
			const char *s = sizesuffix[(op >> 31) & 1];
			UINT8 threeop = (op >> 11) & 1;
			char condbuf[40] = { 0 };

			if ((op >> 10) & 1)
				sprintf(condbuf, "if (%s) ", condtable[(op >> 12) & 15]);

			switch ((op >> 21) & 15)
			{
				/* add */
				case 0:
					if (threeop)
					{
						if (rS1[0] == '0' && rS2[0] == '0')
							sprintf(buffer, "%s%s%s = 0", condbuf, rD, s);
						else if (rS1[0] == '0')
							sprintf(buffer, "%s%s%s = %s%s", condbuf, rD, s, rS2, s);
						else if (rS2[0] == '0')
							sprintf(buffer, "%s%s%s = %s%s", condbuf, rD, s, rS1, s);
						else
							sprintf(buffer, "%s%s%s = %s%s + %s%s", condbuf, rD, s, rS2, s, rS1, s);
					}
					else
					{
						if (rS1[0] == '0')
							sprintf(buffer, "%s%s%s = %s%s", condbuf, rD, s, rD, s);
						else
							sprintf(buffer, "%s%s%s = %s%s + %s%s", condbuf, rD, s, rD, s, rS1, s);
					}
					break;

				case 1:
					sprintf(buffer, "%s%s%s = %s%s * 2", condbuf, rD, s, rS1, s);
					break;

				case 2:
					if (threeop)
						sprintf(buffer, "%s%s%s = %s%s - %s%s", condbuf, rD, s, rS1, s, rS2, s);
					else
						sprintf(buffer, "%s%s%s = %s%s - %s%s", condbuf, rD, s, rS1, s, rD, s);
					break;

				case 3:
					if (threeop)
						sprintf(buffer, "%s%s%s = %s%s # %s%s", condbuf, rD, s, rS2, s, rS1, s);
					else
						sprintf(buffer, "%s%s%s = %s%s # %s%s", condbuf, rD, s, rD, s, rS1, s);
					break;

				case 4:
					if (threeop)
						sprintf(buffer, "%s%s%s = %s%s - %s%s", condbuf, rD, s, rS2, s, rS1, s);
					else
						sprintf(buffer, "%s%s%s = %s%s - %s%s", condbuf, rD, s, rD, s, rS1, s);
					break;

				case 5:
					sprintf(buffer, "%s%s%s = -%s%s", condbuf, rD, s, rS1, s);
					break;

				case 6:
					if (threeop)
						sprintf(buffer, "%s%s%s = %s%s &~ %s%s", condbuf, rD, s, rS2, s, rS1, s);
					else
						sprintf(buffer, "%s%s%s = %s%s &~ %s%s", condbuf, rD, s, rD, s, rS1, s);
					break;

				case 7:
//                  if (threeop)
//                      sprintf(buffer, "%s%s%s - %s%s", condbuf, rS2, s, rS1, s);
//                  else
						sprintf(buffer, "%s%s%s - %s%s", condbuf, rD, s, rS1, s);
					break;

				case 8:
					if (threeop)
						sprintf(buffer, "%s%s%s = %s%s ^ %s%s", condbuf, rD, s, rS2, s, rS1, s);
					else
						sprintf(buffer, "%s%s%s = %s%s ^ %s%s", condbuf, rD, s, rD, s, rS1, s);
					break;

				case 9:
					sprintf(buffer, "%s%s%s = %s%s >>> 1", condbuf, rD, s, rS1, s);
					break;

				case 10:
					if (threeop)
						sprintf(buffer, "%s%s%s = %s%s | %s%s", condbuf, rD, s, rS2, s, rS1, s);
					else
						sprintf(buffer, "%s%s%s = %s%s | %s%s", condbuf, rD, s, rD, s, rS1, s);
					break;

				case 11:
					sprintf(buffer, "%s%s%s = %s%s <<< 1", condbuf, rD, s, rS1, s);
					break;

				case 12:
					sprintf(buffer, "%s%s%s = %s%s >> 1", condbuf, rD, s, rS1, s);
					break;

				case 13:
					sprintf(buffer, "%s%s%s = %s%s / 2", condbuf, rD, s, rS1, s);
					break;

				case 14:
					if (threeop)
						sprintf(buffer, "%s%s%s = %s%s & %s%s", condbuf, rD, s, rS2, s, rS1, s);
					else
						sprintf(buffer, "%s%s%s = %s%s & %s%s", condbuf, rD, s, rD, s, rS1, s);
					break;

				case 15:
//                  if (threeop)
//                      sprintf(buffer, "%s%s%s & %s%s", condbuf, rS1, s, rS2, s);
//                  else
						sprintf(buffer, "%s%s%s & %s%s", condbuf, rD, s, rS1, s);
					break;
			}
			break;
		}

		/* CA format 6c/6d */
		case 0x0d:	case 0x4d:
		{
			const char *rD = regname[(op >> 16) & 0x1f];
			const char *s = sizesuffix[(op >> 31) & 1];
			INT16 N = (INT16)op;

			switch ((op >> 21) & 15)
			{
				case 0:
				case 1:
				case 5:
				case 9:
				case 11:
				case 12:
				case 13:
					sprintf(buffer, "Unexpected: %08X", op);
					break;

				case 2:
					sprintf(buffer, "%s%s = %s - %s%s", rD, s, signed_16bit_unary(N), rD, s);
					break;

				case 3:
					sprintf(buffer, "%s%s = %s%s # %s", rD, s, rD, s, signed_16bit_unary(N));
					break;

				case 4:
					sprintf(buffer, "%s%s = %s%s - %s", rD, s, rD, s, signed_16bit_unary(N));
					break;

				case 6:
					sprintf(buffer, "%s%s = %s%s &~ %s", rD, s, rD, s, unsigned_16bit_size(N, (op >> 31) & 1));
					break;

				case 7:
					sprintf(buffer, "%s%s - %s", rD, s, signed_16bit_unary(N));
					break;

				case 8:
					sprintf(buffer, "%s%s = %s%s ^ %s", rD, s, rD, s, unsigned_16bit_size(N, (op >> 31) & 1));
					break;

				case 10:
					sprintf(buffer, "%s%s = %s%s | %s", rD, s, rD, s, unsigned_16bit_size(N, (op >> 31) & 1));
					break;

				case 14:
					sprintf(buffer, "%s%s = %s%s & %s", rD, s, rD, s, unsigned_16bit_size(N, (op >> 31) & 1));
					break;

				case 15:
					sprintf(buffer, "%s%s & %s", rD, s, unsigned_16bit_size(N, (op >> 31) & 1));
					break;
			}
			break;
		}

		/* CA format 7a */
		case 0x0e:
			if ((op >> 24) & 1)
				sprintf(buffer, "*%08X = %s%s", (INT16)op, regname[(op >> 16) & 0x1f], memsuffix[(op >> 22) & 3]);
			else
				sprintf(buffer, "%s%s = *%08X", regname[(op >> 16) & 0x1f], memsuffix[(op >> 22) & 3], (INT16)op);
			break;

		/* CA format 7b */
		case 0x0f:
			if ((op >> 24) & 1)
				sprintf(buffer, "%s = %s%s", dasm_PI(op & 0x3ff, tempbuf[0]), regname[(op >> 16) & 0x1f], memsuffix[(op >> 22) & 3]);
			else
				sprintf(buffer, "%s%s = %s", regname[(op >> 16) & 0x1f], memsuffix[(op >> 22) & 3], dasm_PI(op & 0x3ff, tempbuf[0]));
			break;

		/* CA format 8a */
		case 0x50:	case 0x51:	case 0x52:	case 0x53:
		case 0x54:	case 0x55:	case 0x56:	case 0x57:
		case 0x58:	case 0x59:	case 0x5a:	case 0x5b:
		case 0x5c:	case 0x5d:	case 0x5e:	case 0x5f:
		{
			INT32 N = (op & 0xffff) | ((INT32)((op & 0x1fe00000) << 3) >> 8);
			const char *rH = regname[(op >> 16) & 0x1f];

			if (((op >> 16) & 0x1f) == 15)
				sprintf(buffer, "goto %s%s [%x]", rH, signed_16bit_sep_nospace(N), (pc + 8 + N) & 0xffffff);
			else if (N && rH[0] != '0')
				sprintf(buffer, "goto %s%s", rH, signed_16bit_sep_nospace(N));
			else if (N)
				sprintf(buffer, "goto $%x", ((INT32)N & 0xffffff));
			else
			{
				if (((op >> 16) & 0x1f) == 20)
					flags = DASMFLAG_STEP_OUT;
				sprintf(buffer, "goto %s", rH);
			}
			break;
		}

		/* CA format 8b */
		case 0x60:	case 0x61:	case 0x62:	case 0x63:
		case 0x64:	case 0x65:	case 0x66:	case 0x67:
		case 0x68:	case 0x69:	case 0x6a:	case 0x6b:
		case 0x6c:	case 0x6d:	case 0x6e:	case 0x6f:
		{
			INT32 immed = (op & 0xffff) | ((INT32)((op & 0x1fe00000) << 3) >> 8);
			sprintf(buffer, "%s = $%x", regnamee[(op >> 16) & 0x1f], immed & 0xffffff);
			break;
		}

		/* CA format 8c */
		case 0x70:	case 0x71:	case 0x72:	case 0x73:
		case 0x74:	case 0x75:	case 0x76:	case 0x77:
		case 0x78:	case 0x79:	case 0x7a:	case 0x7b:
		case 0x7c:	case 0x7d:	case 0x7e:	case 0x7f:
		{
			INT32 N = (op & 0xffff) | ((INT32)((op & 0x1fe00000) << 3) >> 8);
			const char *rM = regname[(op >> 16) & 0x1f];
			sprintf(buffer, "call $%x (%s)", N & 0xffffff, rM);
			flags = DASMFLAG_STEP_OVER | DASMFLAG_STEP_OVER_EXTRA(1);
			break;
		}
	}

	return 4 | flags | DASMFLAG_SUPPORTED;
}