summaryrefslogtreecommitdiffstatshomepage
path: root/src/emu/cpu/dsp16/dsp16dis.c
blob: f866916443036a16aae708cd621d127748a7b8ff (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
#include "emu.h"
#include "dsp16.h"

astring disasmF1Field(const UINT8& F1, const UINT8& D, const UINT8& S)
{
	astring ret = "";
	switch (F1)
	{
		case 0x00: ret.printf("a%d = p, p = x*y", D); break;
		case 0x01: ret.printf("a%d = a%d + p, p = x*y", D, S); break;
		case 0x02: ret.printf("p = x*y"); break;
		case 0x03: ret.printf("a%d = a%d - p, p = x*y", D, S); break;
		case 0x04: ret.printf("a%d = p", D); break;
		case 0x05: ret.printf("a%d = a%d + p", D, S); break;
		case 0x06: ret.printf("NOP"); break;
		case 0x07: ret.printf("a%d = a%d - p", D, S); break;
		case 0x08: ret.printf("a%d = a%d | y", D, S); break;
		case 0x09: ret.printf("a%d = a%d ^ y", D, S); break;
		case 0x0a: ret.printf("a%d & y", S); break;
		case 0x0b: ret.printf("a%d - y", S); break;
		case 0x0c: ret.printf("a%d = y", D); break;
		case 0x0d: ret.printf("a%d = a%d + y", D, S); break;
		case 0x0e: ret.printf("a%d = a%d & y", D, S); break;
		case 0x0f: ret.printf("a%d = a%d - y", D, S); break;

		default: return "UNKNOWN";
	}
	return ret;
}

astring disasmYField(const UINT8& Y)
{
	switch (Y)
	{
		case 0x00: return "*r0";
		case 0x01: return "*r0++";
		case 0x02: return "*r0--";
		case 0x03: return "*r0++j";

		case 0x04: return "*r1";
		case 0x05: return "*r1++";
		case 0x06: return "*r1--";
		case 0x07: return "*r1++j";

		case 0x08: return "*r2";
		case 0x09: return "*r2++";
		case 0x0a: return "*r2--";
		case 0x0b: return "*r2++j";

		case 0x0c: return "*r3";
		case 0x0d: return "*r3++";
		case 0x0e: return "*r3--";
		case 0x0f: return "*r3++j";

		default: return "UNKNOWN";
	}
	return "";
}

astring disasmZField(const UINT8& Z)
{
	switch (Z)
	{
		case 0x00: return "*r0zp";
		case 0x01: return "*r0pz";
		case 0x02: return "*r0m2";
		case 0x03: return "*r0jk";

		case 0x04: return "*r1zp";
		case 0x05: return "*r1pz";
		case 0x06: return "*r1m2";
		case 0x07: return "*r1jk";

		case 0x08: return "*r2zp";
		case 0x09: return "*r2pz";
		case 0x0a: return "*r2m2";
		case 0x0b: return "*r2jk";

		case 0x0c: return "*r3zp";
		case 0x0d: return "*r3pz";
		case 0x0e: return "*r3m2";
		case 0x0f: return "*r3jk";

		default: return "UNKNOWN";
	}
	return "";
}

astring disasmF2Field(const UINT8& F2, const UINT8& D, const UINT8& S)
{
	astring ret = "";
	switch (F2)
	{
		case 0x00: ret.printf("a%d = a%d >> 1", D, S); break;
		case 0x01: ret.printf("a%d = a%d << 1", D, S); break;
		case 0x02: ret.printf("a%d = a%d >> 4", D, S); break;
		case 0x03: ret.printf("a%d = a%d << 4", D, S); break;
		case 0x04: ret.printf("a%d = a%d >> 8", D, S); break;
		case 0x05: ret.printf("a%d = a%d << 8", D, S); break;
		case 0x06: ret.printf("a%d = a%d >> 16", D, S); break;
		case 0x07: ret.printf("a%d = a%d << 16", D, S); break;

		case 0x08: ret.printf("a%d = p", D); break;
		case 0x09: ret.printf("a%dh = a%dh + 1", D, S); break;
		case 0x0a: ret.printf("RESERVED"); break;
		case 0x0b: ret.printf("a%d = rnd(a%d)", D, S); break;
		case 0x0c: ret.printf("a%d = y", D); break;
		case 0x0d: ret.printf("a%d = a%d + 1", D, S); break;
		case 0x0e: ret.printf("a%d = a%d", D, S); break;
		case 0x0f: ret.printf("a%d = -a%d", D, S); break;

		default: return "UNKNOWN";
	}
	return ret;
}

astring disasmCONField(const UINT8& CON)
{
	switch (CON)
	{
		case 0x00: return "mi";
		case 0x01: return "pl";
		case 0x02: return "eq";
		case 0x03: return "ne";
		case 0x04: return "lvs";
		case 0x05: return "lvc";
		case 0x06: return "mvs";
		case 0x07: return "mvc";
		case 0x08: return "heads";
		case 0x09: return "tails";
		case 0x0a: return "c0ge";
		case 0x0b: return "c0lt";
		case 0x0c: return "c1ge";
		case 0x0d: return "c1lt";
		case 0x0e: return "true";
		case 0x0f: return "false";
		case 0x10: return "gt";
		case 0x11: return "le";

		default: return "RESERVED";
	}
	return "";
}

astring disasmBField(const UINT8& B)
{
	switch (B)
	{
		case 0x00: return "return";
		case 0x01: return "ireturn";
		case 0x02: return "goto pt";
		case 0x03: return "call pt";
		case 0x04:
		case 0x05:
		case 0x06:
		case 0x07: return "RESERVED";

		default: return "UNKNOWN";
	}
	return "";
}

astring disasmRImmediateField(const UINT8& R)
{
	switch (R)
	{
		case 0x00: return "j";
		case 0x01: return "k";
		case 0x02: return "rb";
		case 0x03: return "re";
		case 0x04: return "r0";
		case 0x05: return "r1";
		case 0x06: return "r2";
		case 0x07: return "r3";

		default: return "UNKNOWN";
	}
	return "";
}

astring disasmRField(const UINT8& R)
{
	switch (R)
	{
		case 0x00: return "r0";
		case 0x01: return "r1";
		case 0x02: return "r2";
		case 0x03: return "r3";
		case 0x04: return "j";
		case 0x05: return "k";
		case 0x06: return "rb";
		case 0x07: return "re";
		case 0x08: return "pt";
		case 0x09: return "pr";
		case 0x0a: return "pi";
		case 0x0b: return "i";

		case 0x10: return "x";
		case 0x11: return "y";
		case 0x12: return "yl";
		case 0x13: return "auc";
		case 0x14: return "psw";
		case 0x15: return "c0";
		case 0x16: return "c1";
		case 0x17: return "c2";
		case 0x18: return "sioc";
		case 0x19: return "srta";
		case 0x1a: return "sdx";
		case 0x1b: return "tdms";
		case 0x1c: return "pioc";
		case 0x1d: return "pdx0";
		case 0x1e: return "pdx1";

		default: return "RESERVED";
	}
	return "";
}

astring disasmIField(const UINT8& I)
{
	switch (I)
	{
		case 0x00: return "r0/j";
		case 0x01: return "r1/k";
		case 0x02: return "r2/rb";
		case 0x03: return "r3/re";

		default: return "UNKNOWN";
	}
	return "";
}

bool disasmSIField(const UINT8& SI)
{
	switch (SI)
	{
		case 0x00: return 0;	// Not a software interrupt
		case 0x01: return 1;	// Software Interrupt
	}
	return false;
}


CPU_DISASSEMBLE( dsp16a )
{
	UINT8 opSize = 1;
	UINT32 dasmflags = 0;
	UINT16 op  = oprom[0] | (oprom[1] << 8);
	UINT16 op2 = oprom[2] | (oprom[3] << 8);

	// TODO: Test for previous "if CON" instruction and tab the next instruction in?

	const UINT8 opcode = (op >> 11) & 0x1f;
	switch(opcode)
	{
		// Format 1: Multiply/ALU Read/Write Group
		case 0x06:
		{
			// F1, Y
			const UINT8 Y = (op & 0x000f);
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 D = (op & 0x0400) >> 10;
			const UINT8 F1 = (op & 0x01e0) >> 5;
			astring yString = disasmYField(Y);
			astring fString = disasmF1Field(F1, D, S);
			sprintf(buffer, "%s, %s", fString.cstr(), yString.cstr());
			break;
		}
		case 0x04: case 0x1c:
		{
			// F1 Y=a0[1] | F1 Y=a1[1]
			const UINT8 Y = (op & 0x000f);
			const UINT8 X = (op & 0x0010) >> 4;
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 D = (op & 0x0400) >> 10;
			const UINT8 F1 = (op & 0x01e0) >> 5;
			astring yString = disasmYField(Y);
			astring fString = disasmF1Field(F1, D, S);
			astring aString = (opcode == 0x1c) ? "a0" : "a1";
			astring xString = (X) ? "" : "l";
			sprintf(buffer, "%s = %s%s, %s", yString.cstr(), aString.cstr(), xString.cstr(), fString.cstr());
			break;
		}
		case 0x16:
		{
			// F1, x = Y
			const UINT8 Y = (op & 0x000f);
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 D = (op & 0x0400) >> 10;
			const UINT8 F1 = (op & 0x01e0) >> 5;
			astring yString = disasmYField(Y);
			astring fString = disasmF1Field(F1, D, S);
			sprintf(buffer, "%s, x = %s", fString.cstr(), yString.cstr());
			break;
		}
		case 0x17:
		{
			// F1, y[l] = Y
			const UINT8 Y = (op & 0x000f);
			const UINT8 X = (op & 0x0010) >> 4;
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 D = (op & 0x0400) >> 10;
			const UINT8 F1 = (op & 0x01e0) >> 5;
			astring yString = disasmYField(Y);
			astring fString = disasmF1Field(F1, D, S);
			astring xString = (X ? "y" : "y1");
			sprintf(buffer, "%s, %s = %s", fString.cstr(), xString.cstr(), yString.cstr());
			break;
		}
		case 0x1f:
		{
			// F1, y = Y, x = *pt++[i]
			const UINT8 Y = (op & 0x000f);
			const UINT8 X = (op & 0x0010) >> 4;
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 D = (op & 0x0400) >> 10;
			const UINT8 F1 = (op & 0x01e0) >> 5;
			astring yString = disasmYField(Y);
			astring fString = disasmF1Field(F1, D, S);
			astring xString = (X ? "*pt++i" : "*pt++");
			sprintf(buffer, "%s, y = %s, x = %s", fString.cstr(), yString.cstr(), xString.cstr());
			break;
		}
		case 0x19: case 0x1b:
		{
			// F1, y = a0|1, x = *pt++[i]
			const UINT8 Y = (op & 0x000f);
			const UINT8 X = (op & 0x0010) >> 4;
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 D = (op & 0x0400) >> 10;
			const UINT8 F1 = (op & 0x01e0) >> 5;
			astring fString = disasmF1Field(F1, D, S);
			astring xString = (X ? "*pt++i" : "*pt++");
			astring aString = (opcode == 0x19) ? "a0" : "a1";
			sprintf(buffer, "%s, y = %s, x = %s", fString.cstr(), aString.cstr(), xString.cstr());
			if (Y != 0x00) sprintf(buffer, "UNKNOWN");
			break;
		}
		case 0x14:
		{
			// F1, Y = y[1]
			const UINT8 Y = (op & 0x000f);
			const UINT8 X = (op & 0x0010) >> 4;
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 D = (op & 0x0400) >> 10;
			const UINT8 F1 = (op & 0x01e0) >> 5;
			astring yString = disasmYField(Y);
			astring xString = (X ? "y" : "y1");
			astring fString = disasmF1Field(F1, D, S);
			sprintf(buffer, "%s, %s = %s", fString.cstr(), yString.cstr(), xString.cstr());
			break;
		}

		// Format 1a: Multiply/ALU Read/Write Group (major typo in docs on p3-51)
		case 0x07:
		{
			// F1, At[1] = Y
			const UINT8 Y = (op & 0x000f);
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 aT = (op & 0x0400) >> 10;
			const UINT8 F1 = (op & 0x01e0) >> 5;
			astring yString = disasmYField(Y);
			astring atString = (aT ? "a0" : "a1");
			astring fString = disasmF1Field(F1, aT, S);
			sprintf(buffer, "%s, %s = %s", fString.cstr(), atString.cstr(), yString.cstr());
			break;
		}

		// Format 2: Multiply/ALU Read/Write Group
		case 0x15:
		{
			// F1, Z : y[1]
			const UINT8 Z = (op & 0x000f);
			const UINT8 X = (op & 0x0010) >> 4;
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 D = (op & 0x0400) >> 10;
			const UINT8 F1 = (op & 0x01e0) >> 5;
			astring zString = disasmZField(Z);
			astring xString = (X ? "y" : "y1");
			astring fString = disasmF1Field(F1, D, S);
			sprintf(buffer, "%s, %s <=> %s", fString.cstr(), xString.cstr(), zString.cstr());
			break;
		}
		case 0x1d:
		{
			// F1, Z : y, x=*pt++[i]
			const UINT8 Z = (op & 0x000f);
			const UINT8 X = (op & 0x0010) >> 4;
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 D = (op & 0x0400) >> 10;
			const UINT8 F1 = (op & 0x01e0) >> 5;
			astring zString = disasmZField(Z);
			astring xString = (X ? "*pt++i" : "*pt++");
			astring fString = disasmF1Field(F1, D, S);
			sprintf(buffer, "%s, %s <=> y, x = %s", fString.cstr(), zString.cstr(), xString.cstr());
			break;
		}

		// Format 2a: Multiply/ALU Read/Write Group
		case 0x05:
		{
			// F1, Z : aT[1]
			const UINT8 Z = (op & 0x000f);
			const UINT8 X = (op & 0x0010) >> 4;
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 aT = (op & 0x0400) >> 10;
			const UINT8 F1 = (op & 0x01e0) >> 5;
			astring zString = disasmZField(Z);
			astring atString = (aT ? "a0" : "a1");
			atString += X ? "" : "1";   // TODO: Figure out unclear wording.
			astring fString = disasmF1Field(F1, aT, S);
			sprintf(buffer, "%s, %s <=> %s", fString.cstr(), zString.cstr(), atString.cstr());
			break;
		}

		// Format 3: Special Functions
		case 0x12:
		case 0x13:
		{
			// if|ifc CON F2
			const UINT8 CON = (op & 0x001f);
			const UINT8 S = (op & 0x0200) >> 9;
			const UINT8 D = (op & 0x0400) >> 10;
			const UINT8 F2 = (op & 0x01e0) >> 5;
			astring fString = disasmF2Field(F2, D, S);
			astring conString = disasmCONField(CON);
			if (op & 0x0800) sprintf(buffer,  "if %s : %s", conString.cstr(), fString.cstr());
			else             sprintf(buffer, "ifc %s : %s", conString.cstr(), fString.cstr());
			break;
		}

		// Format 4: Branch Direct Group
		case 0x00: case 0x01:
		{
			// goto JA
			const UINT16 JA = (op & 0x0fff) | (pc & 0xf000);
			sprintf(buffer, "goto 0x%04x", JA);
			break;
		}
		case 0x10: case 0x11:
		{
			// call JA
			const UINT16 JA = (op & 0x0fff) | (pc & 0xf000);
			sprintf(buffer, "call 0x%04x", JA);
			break;
		}

		// Format 5: Branch Indirect Group
		case 0x18:
		{
			// goto B
			const UINT8 B = (op & 0x0700) >> 8;
			astring bString = disasmBField(B);
			sprintf(buffer, "%s", bString.cstr());
			break;
		}

		// Format 6: Contitional Branch Qualifier/Software Interrupt (icall)
		case 0x1a:
		{
			// if CON [goto/call/return]
			const UINT8 CON = (op & 0x001f);
			astring conString = disasmCONField(CON);
			sprintf(buffer, "if %s:", conString.cstr());
			// TODO: Test for invalid ops
			// icall
			if (op == 0xd40e) sprintf(buffer, "icall");
			break;
		}

		// Format 7: Data Move Group
		case 0x09: case 0x0b:
		{
			// R = aS
			const UINT8 R = (op & 0x03f0) >> 4;
			const UINT8 S = (op & 0x1000) >> 12;
			astring rString = disasmRField(R);
			sprintf(buffer, "%s = %s", rString.cstr(), (S ? "a1" : "a0"));
			break;
		}
		case 0x08:
		{
			// aT = R
			const UINT8 R  = (op & 0x03f0) >> 4;
			const UINT8 aT = (op & 0x0400) >> 10;
			astring rString = disasmRField(R);
			sprintf(buffer, "%s = %s", (aT ? "a0" : "a1"), rString.cstr());
			break;
		}
		case 0x0f:
		{
			// R = Y
			const UINT8 Y = (op & 0x000f);
			const UINT8 R = (op & 0x03f0) >> 4;
			astring yString = disasmYField(Y);
			astring rString = disasmRField(R);
			sprintf(buffer, "%s = %s", rString.cstr(), yString.cstr());
			// TODO: Special case the R == [y, y1, or x] case
			break;
		}
		case 0x0c:
		{
			// Y = R
			const UINT8 Y = (op & 0x000f);
			const UINT8 R = (op & 0x03f0) >> 4;
			astring yString = disasmYField(Y);
			astring rString = disasmRField(R);
			sprintf(buffer, "%s = %s", yString.cstr(), rString.cstr());
			break;
		}
		case 0x0d:
		{
			// Z : R
			const UINT8 Z = (op & 0x000f);
			const UINT8 R = (op & 0x03f0) >> 4;
			astring zString = disasmZField(Z);
			astring rString = disasmRField(R);
			sprintf(buffer, "%s <=> %s", zString.cstr(), rString.cstr());
			break;
		}

		// Format 8: Data Move (immediate operand - 2 words)
		case 0x0a:
		{
			// R = N
			const UINT8 R = (op & 0x03f0) >> 4;
			astring rString = disasmRField(R);
			sprintf(buffer, "%s = 0x%04x", rString.cstr(), op2);
			opSize = 2;
			break;
		}

		// Format 9: Short Immediate Group
		case 0x02: case 0x03:
		{
			// R = M
			const UINT8 M = (op & 0x00ff);
			const UINT8 R = (op & 0x0e00) >> 9;
			astring rString = disasmRImmediateField(R);
			sprintf(buffer, "%s = 0x%02x", rString.cstr(), M);
			break;
		}

		// Format 10: do - redo
		case 0x0e:
		{
			// do|redo K
			const UINT8 K = (op & 0x007f);
			const UINT8 NI = (op & 0x0780) >> 7;
			sprintf(buffer, "do (next %d inst) %d times", NI, K);
			// TODO: Limits on K & NI
			if (NI == 0x00)
				sprintf(buffer, "redo %d", K);
			break;
		}

		// RESERVED
		case 0x1e:
		{
			sprintf(buffer, "RESERVED");
			break;
		}

		// UNKNOWN
		default:
		{
			sprintf(buffer, "UNKNOWN");
			break;
		}
	}

	return opSize | dasmflags | DASMFLAG_SUPPORTED;
}