summaryrefslogtreecommitdiffstatshomepage
path: root/src/emu/cpu/tms32010/32010dsm.c
blob: c7d73071d8b6907defb05b6be204ded12725d3ce (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
 /**************************************************************************\
 *                Texas Instruments TMS32010 DSP Disassembler               *
 *                                                                          *
 *                  Copyright Tony La Porta                                 *
 *               To be used with TMS32010 DSP Emulator engine.              *
 *      You are not allowed to distribute this software commercially.       *
 *                      Written for the MAME project.                       *
 *                                                                          *
 *         Many thanks to those involved in the i8039 Disassembler          *
 *                        as this was based on it.                          *
 *                                                                          *
 *                                                                          *
 *                                                                          *
 * A Memory address                                                         *
 * B Branch Address for Branch instructions (Requires next opcode read)     *
 * D Immediate byte load                                                    *
 * K Immediate bit  load                                                    *
 * W Immediate word load (Actually 13 bit)                                  *
 * M AR[x] register modification type (for indirect addressing)             *
 * N ARP register to change ARP pointer to (for indirect addressing)        *
 * P I/O port address number                                                *
 * R AR[R] register to use                                                  *
 * S Shift ALU left                                                         *
 *                                                                          *
 \**************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#ifdef ENABLE_DEBUGGER					/* Compile interface to MAME */
#include "cpuintrf.h"
#include "tms32010.h"
#include "debugger.h"
#else								/* Compile interface for standalone */
extern unsigned char *Buffer;
#ifdef MSB_FIRST
#define READOP16(A)  ( ((Buffer[A+1]<<8) | Buffer[A]) )
#define READARG16(A) ( ((Buffer[A+1]<<8) | Buffer[A]) )
#else
#define READOP16(A)  ( ((Buffer[A]<<8) | Buffer[A+1]) )
#define READARG16(A) ( ((Buffer[A]<<8) | Buffer[A+1]) )
#endif
#endif



typedef unsigned char byte;
typedef unsigned short int word;

#define FMT(a,b) a, b
#define PTRS_PER_FORMAT 2

static const char *const arith[4] = { "*" , "*-" , "*+" , "??" } ;
static const char *const nextar[4] = { ",AR0" , ",AR1" , "" , "" } ;


static const char *const TMS32010Formats[] = {
	FMT("0000ssss0aaaaaaa", "add  %A%S"),
	FMT("0000ssss10mmn00n", "add  %M%S%N"),
	FMT("0001ssss0aaaaaaa", "sub  %A%S"),
	FMT("0001ssss10mmn00n", "sub  %M%S%N"),
	FMT("0010ssss0aaaaaaa", "lac  %A%S"),
	FMT("0010ssss10mmn00n", "lac  %M%S%N"),
	FMT("0011000r0aaaaaaa", "sar  %R,%A"),
	FMT("0011000r10mmn00n", "sar  %R%M%N"),
	FMT("0011100r0aaaaaaa", "lar  %R,%A"),
	FMT("0011100r10mmn00n", "lar  %R%M%N"),
	FMT("01000ppp0aaaaaaa", "in   %A,%P"),
	FMT("01000ppp10mmn00n", "in   %M,%P%N"),
	FMT("01001ppp0aaaaaaa", "out  %A,%P"),
	FMT("01001ppp10mmn00n", "out  %M,%P%N"),
	FMT("01010sss0aaaaaaa", "sacl %A"),		/* This instruction has a shift but */
	FMT("01010sss10mmn00n", "sacl %M%N"),	/* is documented as not performed */
	FMT("01011sss0aaaaaaa", "sach %A%S"),
	FMT("01011sss10mmn00n", "sach %M%S%N"),
	FMT("011000000aaaaaaa", "addh %A"),
	FMT("0110000010mmn00n", "addh %M%N"),
	FMT("011000010aaaaaaa", "adds %A"),
	FMT("0110000110mmn00n", "adds %M%N"),
	FMT("011000100aaaaaaa", "subh %A"),
	FMT("0110001010mmn00n", "subh %M%N"),
	FMT("011000110aaaaaaa", "subs %A"),
	FMT("0110001110mmn00n", "subs %M%N"),
	FMT("011001000aaaaaaa", "subc %A"),
	FMT("0110010010mmn00n", "subc %M%N"),
	FMT("011001010aaaaaaa", "zalh %A"),
	FMT("0110010110mmn00n", "zalh %M%N"),
	FMT("011001100aaaaaaa", "zals %A"),
	FMT("0110011010mmn00n", "zals %M%N"),
	FMT("011001110aaaaaaa", "tblr %A"),
	FMT("0110011110mmn00n", "tblr %M%N"),
	FMT("011010001000000k", "larp %K"),
	FMT("011010000aaaaaaa", "mar  %A"),		/* Actually this is executed as a NOP */
/*  FMT("0110100010mmn00n", "mar  %M%N"),   */
/*  MAR indirect has been expanded out to all its variations because one of */
/*  its opcodes is the same as LARP (actually performs the same function) */

	FMT("0110100010001000", "mar  *"),
	FMT("0110100010001001", "mar  *"),
	FMT("0110100010010000", "mar  *-,AR0"),
	FMT("0110100010010001", "mar  *-,AR1"),
	FMT("0110100010011000", "mar  *-"),
	FMT("0110100010011001", "mar  *-"),
	FMT("0110100010100000", "mar  *+,AR0"),
	FMT("0110100010100001", "mar  *+,AR1"),
	FMT("0110100010101000", "mar  *+"),
	FMT("0110100010101001", "mar  *+"),
	FMT("0110100010110000", "mar  ??,AR0"),
	FMT("0110100010110001", "mar  ??,AR1"),
	FMT("0110100010111000", "mar  ??"),
	FMT("0110100010111001", "mar  ??"),

	FMT("011010010aaaaaaa", "dmov %A"),
	FMT("0110100110mmn00n", "dmov %M%N"),
	FMT("011010100aaaaaaa", "lt   %A"),
	FMT("0110101010mmn00n", "lt   %M%N"),
	FMT("011010110aaaaaaa", "ltd  %A"),
	FMT("0110101110mmn00n", "ltd  %M%N"),
	FMT("011011000aaaaaaa", "lta  %A"),
	FMT("0110110010mmn00n", "lta  %M%N"),
	FMT("011011010aaaaaaa", "mpy  %A"),
	FMT("0110110110mmn00n", "mpy  %M%N"),
	FMT("011011100000000k", "ldpk %K"),
	FMT("011011110aaaaaaa", "ldp  %A"),
	FMT("0110111110mmn00n", "ldp  %M%N"),
	FMT("0111000rdddddddd", "lark %R,%D"),
	FMT("011110000aaaaaaa", "xor  %A"),
	FMT("0111100010mmn00n", "xor  %M%N"),
	FMT("011110010aaaaaaa", "and  %A"),
	FMT("0111100110mmn00n", "and  %M%N"),
	FMT("011110100aaaaaaa", "or   %A"),
	FMT("0111101010mmn00n", "or   %M%N"),
	FMT("011110110aaaaaaa", "lst  %A"),
	FMT("0111101110mmn00n", "lst  %M%N"),
	FMT("011111000aaaaaaa", "sst  %A"),
	FMT("0111110010mmn00n", "sst  %M%N"),
	FMT("011111010aaaaaaa", "tblw %A"),
	FMT("0111110110mmn00n", "tblw %M%N"),
	FMT("01111110dddddddd", "lack %D"),
	FMT("0111111110000000", "nop"),			/* 7F80 */
	FMT("0111111110000001", "dint"),
	FMT("0111111110000010", "eint"),
	FMT("0111111110001000", "abs"),			/* 7F88 */
	FMT("0111111110001001", "zac"),
	FMT("0111111110001010", "rovm"),
	FMT("0111111110001011", "sovm"),
	FMT("0111111110001100", "cala"),
	FMT("0111111110001101", "ret"),
	FMT("0111111110001110", "pac"),
	FMT("0111111110001111", "apac"),
	FMT("0111111110010000", "spac"),
	FMT("0111111110011100", "push"),
	FMT("0111111110011101", "pop"),			/* 7F9D */
	FMT("100wwwwwwwwwwwww", "mpyk %W"),
	FMT("1111010000000000bbbbbbbbbbbbbbbb", "banz %B"),
	FMT("1111010100000000bbbbbbbbbbbbbbbb", "bv   %B"),
	FMT("1111011000000000bbbbbbbbbbbbbbbb", "bioz %B"),
	FMT("1111100000000000bbbbbbbbbbbbbbbb", "call %B"),
	FMT("1111100100000000bbbbbbbbbbbbbbbb", "b    %B"),
	FMT("1111101000000000bbbbbbbbbbbbbbbb", "blz  %B"),
	FMT("1111101100000000bbbbbbbbbbbbbbbb", "blez %B"),
	FMT("1111110000000000bbbbbbbbbbbbbbbb", "bgz  %B"),
	FMT("1111110100000000bbbbbbbbbbbbbbbb", "bgez %B"),
	FMT("1111111000000000bbbbbbbbbbbbbbbb", "bnz  %B"),
	FMT("1111111100000000bbbbbbbbbbbbbbbb", "bz   %B"),
	NULL
};

#define MAX_OPS (((sizeof(TMS32010Formats) / sizeof(TMS32010Formats[0])) - 1) / PTRS_PER_FORMAT)

typedef struct opcode {
	word mask;			/* instruction mask */
	word bits;			/* constant bits */
	word extcode;		/* value that gets extension code */
	const char *parse;		/* how to parse bits */
	const char *fmt;			/* instruction format */
} TMS32010Opcode;

static TMS32010Opcode Op[MAX_OPS+1];
static int OpInizialized = 0;

static void InitDasm32010(void)
{
	const char *p;
	const char *const *ops;
	word mask, bits;
	int bit;
	int i;

	ops = TMS32010Formats; i = 0;
	while (*ops)
	{
		p = *ops;
		mask = 0; bits = 0; bit = 15;
		while (*p && bit >= 0)
		{
			switch (*p++)
			{
				case '1': mask |= 1<<bit; bits |= 1<<bit; bit--; break;
				case '0': mask |= 1<<bit; bit--; break;
				case ' ': break;
				case 'a':
				case 'b':
				case 'd':
				case 'k':
				case 'm':
				case 'n':
				case 'p':
				case 'r':
				case 's':
				case 'w':
					bit --;
					break;
				default: fatalerror("Invalid instruction encoding '%s %s'",
					ops[0],ops[1]);
			}
		}
		if (bit != -1 )
		{
			fatalerror("not enough bits in encoding '%s %s' %d",
				ops[0],ops[1],bit);
		}
		while (isspace(*p)) p++;
		if (*p) Op[i].extcode = *p;
		Op[i].bits = bits;
		Op[i].mask = mask;
		Op[i].fmt = ops[1];
		Op[i].parse = ops[0];

		ops += PTRS_PER_FORMAT;
		i++;
	}

	OpInizialized = 1;
}

offs_t tms32010_dasm(char *str, offs_t pc, const UINT8 *oprom, const UINT8 *opram)
{
	UINT32 flags = 0;
	int a, b, d, k, m, n, p, r, s, w;	/* these can all be filled in by parsing an instruction */
	int i;
	int op;
	int cnt = 1;
	int code;
	int bit;
	char *strtmp;
	const char *cp;				/* character pointer in OpFormats */

	if (!OpInizialized) InitDasm32010();

	op = -1;				/* no matching opcode */
	code = (oprom[0] << 8) | oprom[1];
	for ( i = 0; i < MAX_OPS; i++)
	{
		if ((code & Op[i].mask) == Op[i].bits)
		{
			if (op != -1)
			{
				mame_printf_debug("Error: opcode %04Xh matches %d (%s) and %d (%s)\n",
					code,i,Op[i].fmt,op,Op[op].fmt);
			}
			op = i;
		}
	}
	if (op == -1)
	{
		sprintf(str,"???? dw %04Xh",code);
		return cnt | DASMFLAG_SUPPORTED;
	}
	strtmp = str;
	if (Op[op].extcode)
	{
		bit = 31;
		code <<= 16;
		code |= (opram[2] << 8) | opram[3];
		cnt++;
	}
	else
	{
		bit = 15;
	}

	/* shift out operands */
	cp = Op[op].parse;
	a = b = d = k = m = n = p = r = s = w = 0;

	while (bit >= 0)
	{
		/* mame_printf_debug("{%c/%d}",*cp,bit); */
		switch(*cp)
		{
			case 'a': a <<=1; a |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
			case 'b': b <<=1; b |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
			case 'd': d <<=1; d |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
			case 'k': k <<=1; k |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
			case 'm': m <<=1; m |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
			case 'n': n <<=1; n |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
			case 'p': p <<=1; p |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
			case 'r': r <<=1; r |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
			case 's': s <<=1; s |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
			case 'w': w <<=1; w |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
			case ' ': break;
			case '1': case '0':  bit--; break;
			case '\0': fatalerror("premature end of parse string, opcode %x, bit = %d",code,bit);
		}
		cp++;
	}

	/* now traverse format string */
	cp = Op[op].fmt;

	if (!strncmp(cp, "cal", 3))
		flags = DASMFLAG_STEP_OVER;
	else if (!strncmp(cp, "ret", 3))
		flags = DASMFLAG_STEP_OUT;

	while (*cp)
	{
		if (*cp == '%')
		{
			char num[20], *q;
			cp++;
			switch (*cp++)
			{
				case 'A': sprintf(num,"$%02X",a); break;
				case 'B': sprintf(num,"$%04X",b); break;
				case 'D': sprintf(num,"%02Xh",d); break;
				case 'K': sprintf(num,"%d",k); break;
				case 'N': sprintf(num,"%s",nextar[n]); break;
				case 'M': sprintf(num,"%s",arith[m]); break;
				case 'P': sprintf(num,"PA%d",p); break;
				case 'R': sprintf(num,"AR%d",r); break;
				case 'S': sprintf(num,",%d",s); break;
				case 'W': sprintf(num,"%04Xh",w); break;
				default:
					fatalerror("illegal escape character in format '%s'",Op[op].fmt);
			}
			q = num; while (*q) *str++ = *q++;
			*str = '\0';
		}
		else
		{
			*str++ = *cp++;
			*str = '\0';
		}
	}
	return cnt | flags | DASMFLAG_SUPPORTED;
}