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dos2unix
[xorcyst.git] / opcode.c
bloba54a0fbe0bd5d6fe82b94288ea6089c1fc7c1d2c
1 /*
2 * $Id: opcode.c,v 1.2 2007/07/22 13:33:26 khansen Exp $
3 * $Log: opcode.c,v $
4 * Revision 1.2 2007/07/22 13:33:26 khansen
5 * convert tabs to whitespaces
6 *
7 * Revision 1.1 2004/06/30 07:55:46 kenth
8 * Initial revision
9 *
10 */
11
12 /**
13 * (C) 2004 Kent Hansen
14 *
15 * The XORcyst is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * The XORcyst is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with The XORcyst; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 */
29
30 /**
31 * This file contains functions for converting 6502 instruction mnemonics from
32 * an enumerated type to actual 6502 opcodes, getting zeropage-equivalent opcode
33 * of an absolute-mode opcode, getting instruction lengths, mnemonic strings ...
34 */
35
36 #include "opcode.h"
37
38 /**
39 * Gets the opcode that a pair of (mnemonic, addressing mode) maps to.
40 * @param mnc Instruction mnemonic
41 * @param amode Addressing mode
42 * @return Valid opcode byte, or 0xFF if mnc and amode are an invalid combination
43 */
44 unsigned char opcode_get(instr_mnemonic mnc, addressing_mode amode)
45 {
46 /* 56 instructions, 13 addressing modes. */
47 static unsigned char opcode_lookup[56][13] = {
48 /* ADC_MNEMONIC */
49 {
50 /* IMPLIED_MODE */ 0xFF,
51 /* ACCUMULATOR_MODE */ 0xFF,
52 /* IMMEDIATE_MODE */ 0x69,
53 /* ZEROPAGE_MODE */ 0x65,
54 /* ZEROPAGE_X_MODE */ 0x75,
55 /* ZEROPAGE_Y_MODE */ 0xFF,
56 /* ABSOLUTE_MODE */ 0x6D,
57 /* ABSOLUTE_X_MODE */ 0x7D,
58 /* ABSOLUTE_Y_MODE */ 0x79,
59 /* PREINDEXED_INDIRECT_MODE */ 0x61,
60 /* POSTINDEXED_INDIRECT_MODE */ 0x71,
61 /* INDIRECT_MODE */ 0xFF,
62 /* RELATIVE_MODE */ 0xFF
63 },
64 /* AND_MNEMONIC */
65 {
66 /* IMPLIED_MODE */ 0xFF,
67 /* ACCUMULATOR_MODE */ 0xFF,
68 /* IMMEDIATE_MODE */ 0x29,
69 /* ZEROPAGE_MODE */ 0x25,
70 /* ZEROPAGE_X_MODE */ 0x35,
71 /* ZEROPAGE_Y_MODE */ 0xFF,
72 /* ABSOLUTE_MODE */ 0x2D,
73 /* ABSOLUTE_X_MODE */ 0x3D,
74 /* ABSOLUTE_Y_MODE */ 0x39,
75 /* PREINDEXED_INDIRECT_MODE */ 0x21,
76 /* POSTINDEXED_INDIRECT_MODE */ 0x31,
77 /* INDIRECT_MODE */ 0xFF,
78 /* RELATIVE_MODE */ 0xFF
79 },
80 /* ASL_MNEMONIC */
81 {
82 /* IMPLIED_MODE */ 0x0A,
83 /* ACCUMULATOR_MODE */ 0x0A,
84 /* IMMEDIATE_MODE */ 0xFF,
85 /* ZEROPAGE_MODE */ 0x06,
86 /* ZEROPAGE_X_MODE */ 0x16,
87 /* ZEROPAGE_Y_MODE */ 0xFF,
88 /* ABSOLUTE_MODE */ 0x0E,
89 /* ABSOLUTE_X_MODE */ 0x1E,
90 /* ABSOLUTE_Y_MODE */ 0xFF,
91 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
92 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
93 /* INDIRECT_MODE */ 0xFF,
94 /* RELATIVE_MODE */ 0xFF
95 },
96 /* BCC_MNEMONIC */
97 {
98 /* IMPLIED_MODE */ 0xFF,
99 /* ACCUMULATOR_MODE */ 0xFF,
100 /* IMMEDIATE_MODE */ 0xFF,
101 /* ZEROPAGE_MODE */ 0xFF,
102 /* ZEROPAGE_X_MODE */ 0xFF,
103 /* ZEROPAGE_Y_MODE */ 0xFF,
104 /* ABSOLUTE_MODE */ 0xFF,
105 /* ABSOLUTE_X_MODE */ 0xFF,
106 /* ABSOLUTE_Y_MODE */ 0xFF,
107 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
108 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
109 /* INDIRECT_MODE */ 0xFF,
110 /* RELATIVE_MODE */ 0x90
111 },
112 /* BCS_MNEMONIC */
113 {
114 /* IMPLIED_MODE */ 0xFF,
115 /* ACCUMULATOR_MODE */ 0xFF,
116 /* IMMEDIATE_MODE */ 0xFF,
117 /* ZEROPAGE_MODE */ 0xFF,
118 /* ZEROPAGE_X_MODE */ 0xFF,
119 /* ZEROPAGE_Y_MODE */ 0xFF,
120 /* ABSOLUTE_MODE */ 0xFF,
121 /* ABSOLUTE_X_MODE */ 0xFF,
122 /* ABSOLUTE_Y_MODE */ 0xFF,
123 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
124 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
125 /* INDIRECT_MODE */ 0xFF,
126 /* RELATIVE_MODE */ 0xB0
127 },
128 /* BEQ_MNEMONIC */
129 {
130 /* IMPLIED_MODE */ 0xFF,
131 /* ACCUMULATOR_MODE */ 0xFF,
132 /* IMMEDIATE_MODE */ 0xFF,
133 /* ZEROPAGE_MODE */ 0xFF,
134 /* ZEROPAGE_X_MODE */ 0xFF,
135 /* ZEROPAGE_Y_MODE */ 0xFF,
136 /* ABSOLUTE_MODE */ 0xFF,
137 /* ABSOLUTE_X_MODE */ 0xFF,
138 /* ABSOLUTE_Y_MODE */ 0xFF,
139 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
140 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
141 /* INDIRECT_MODE */ 0xFF,
142 /* RELATIVE_MODE */ 0xF0
143 },
144 /* BIT_MNEMONIC */
145 {
146 /* IMPLIED_MODE */ 0xFF,
147 /* ACCUMULATOR_MODE */ 0xFF,
148 /* IMMEDIATE_MODE */ 0xFF,
149 /* ZEROPAGE_MODE */ 0x24,
150 /* ZEROPAGE_X_MODE */ 0xFF,
151 /* ZEROPAGE_Y_MODE */ 0xFF,
152 /* ABSOLUTE_MODE */ 0x2C,
153 /* ABSOLUTE_X_MODE */ 0xFF,
154 /* ABSOLUTE_Y_MODE */ 0xFF,
155 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
156 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
157 /* INDIRECT_MODE */ 0xFF,
158 /* RELATIVE_MODE */ 0xFF
159 },
160 /* BMI_MNEMONIC */
161 {
162 /* IMPLIED_MODE */ 0xFF,
163 /* ACCUMULATOR_MODE */ 0xFF,
164 /* IMMEDIATE_MODE */ 0xFF,
165 /* ZEROPAGE_MODE */ 0xFF,
166 /* ZEROPAGE_X_MODE */ 0xFF,
167 /* ZEROPAGE_Y_MODE */ 0xFF,
168 /* ABSOLUTE_MODE */ 0xFF,
169 /* ABSOLUTE_X_MODE */ 0xFF,
170 /* ABSOLUTE_Y_MODE */ 0xFF,
171 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
172 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
173 /* INDIRECT_MODE */ 0xFF,
174 /* RELATIVE_MODE */ 0x30
175 },
176 /* BNE_MNEMONIC */
177 {
178 /* IMPLIED_MODE */ 0xFF,
179 /* ACCUMULATOR_MODE */ 0xFF,
180 /* IMMEDIATE_MODE */ 0xFF,
181 /* ZEROPAGE_MODE */ 0xFF,
182 /* ZEROPAGE_X_MODE */ 0xFF,
183 /* ZEROPAGE_Y_MODE */ 0xFF,
184 /* ABSOLUTE_MODE */ 0xFF,
185 /* ABSOLUTE_X_MODE */ 0xFF,
186 /* ABSOLUTE_Y_MODE */ 0xFF,
187 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
188 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
189 /* INDIRECT_MODE */ 0xFF,
190 /* RELATIVE_MODE */ 0xD0
191 },
192 /* BPL_MNEMONIC */
193 {
194 /* IMPLIED_MODE */ 0xFF,
195 /* ACCUMULATOR_MODE */ 0xFF,
196 /* IMMEDIATE_MODE */ 0xFF,
197 /* ZEROPAGE_MODE */ 0xFF,
198 /* ZEROPAGE_X_MODE */ 0xFF,
199 /* ZEROPAGE_Y_MODE */ 0xFF,
200 /* ABSOLUTE_MODE */ 0xFF,
201 /* ABSOLUTE_X_MODE */ 0xFF,
202 /* ABSOLUTE_Y_MODE */ 0xFF,
203 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
204 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
205 /* INDIRECT_MODE */ 0xFF,
206 /* RELATIVE_MODE */ 0x10
207 },
208 /* BRK_MNEMONIC */
209 {
210 /* IMPLIED_MODE */ 0x00,
211 /* ACCUMULATOR_MODE */ 0xFF,
212 /* IMMEDIATE_MODE */ 0xFF,
213 /* ZEROPAGE_MODE */ 0xFF,
214 /* ZEROPAGE_X_MODE */ 0xFF,
215 /* ZEROPAGE_Y_MODE */ 0xFF,
216 /* ABSOLUTE_MODE */ 0xFF,
217 /* ABSOLUTE_X_MODE */ 0xFF,
218 /* ABSOLUTE_Y_MODE */ 0xFF,
219 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
220 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
221 /* INDIRECT_MODE */ 0xFF,
222 /* RELATIVE_MODE */ 0xFF
223 },
224 /* BVC_MNEMONIC */
225 {
226 /* IMPLIED_MODE */ 0xFF,
227 /* ACCUMULATOR_MODE */ 0xFF,
228 /* IMMEDIATE_MODE */ 0xFF,
229 /* ZEROPAGE_MODE */ 0xFF,
230 /* ZEROPAGE_X_MODE */ 0xFF,
231 /* ZEROPAGE_Y_MODE */ 0xFF,
232 /* ABSOLUTE_MODE */ 0xFF,
233 /* ABSOLUTE_X_MODE */ 0xFF,
234 /* ABSOLUTE_Y_MODE */ 0xFF,
235 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
236 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
237 /* INDIRECT_MODE */ 0xFF,
238 /* RELATIVE_MODE */ 0x50
239 },
240 /* BVS_MNEMONIC */
241 {
242 /* IMPLIED_MODE */ 0xFF,
243 /* ACCUMULATOR_MODE */ 0xFF,
244 /* IMMEDIATE_MODE */ 0xFF,
245 /* ZEROPAGE_MODE */ 0xFF,
246 /* ZEROPAGE_X_MODE */ 0xFF,
247 /* ZEROPAGE_Y_MODE */ 0xFF,
248 /* ABSOLUTE_MODE */ 0xFF,
249 /* ABSOLUTE_X_MODE */ 0xFF,
250 /* ABSOLUTE_Y_MODE */ 0xFF,
251 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
252 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
253 /* INDIRECT_MODE */ 0xFF,
254 /* RELATIVE_MODE */ 0x70
255 },
256 /* CLC_MNEMONIC */
257 {
258 /* IMPLIED_MODE */ 0x18,
259 /* ACCUMULATOR_MODE */ 0xFF,
260 /* IMMEDIATE_MODE */ 0xFF,
261 /* ZEROPAGE_MODE */ 0xFF,
262 /* ZEROPAGE_X_MODE */ 0xFF,
263 /* ZEROPAGE_Y_MODE */ 0xFF,
264 /* ABSOLUTE_MODE */ 0xFF,
265 /* ABSOLUTE_X_MODE */ 0xFF,
266 /* ABSOLUTE_Y_MODE */ 0xFF,
267 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
268 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
269 /* INDIRECT_MODE */ 0xFF,
270 /* RELATIVE_MODE */ 0xFF
271 },
272 /* CLD_MNEMONIC */
273 {
274 /* IMPLIED_MODE */ 0xD8,
275 /* ACCUMULATOR_MODE */ 0xFF,
276 /* IMMEDIATE_MODE */ 0xFF,
277 /* ZEROPAGE_MODE */ 0xFF,
278 /* ZEROPAGE_X_MODE */ 0xFF,
279 /* ZEROPAGE_Y_MODE */ 0xFF,
280 /* ABSOLUTE_MODE */ 0xFF,
281 /* ABSOLUTE_X_MODE */ 0xFF,
282 /* ABSOLUTE_Y_MODE */ 0xFF,
283 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
284 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
285 /* INDIRECT_MODE */ 0xFF,
286 /* RELATIVE_MODE */ 0xFF
287 },
288 /* CLI_MNEMONIC */
289 {
290 /* IMPLIED_MODE */ 0x58,
291 /* ACCUMULATOR_MODE */ 0xFF,
292 /* IMMEDIATE_MODE */ 0xFF,
293 /* ZEROPAGE_MODE */ 0xFF,
294 /* ZEROPAGE_X_MODE */ 0xFF,
295 /* ZEROPAGE_Y_MODE */ 0xFF,
296 /* ABSOLUTE_MODE */ 0xFF,
297 /* ABSOLUTE_X_MODE */ 0xFF,
298 /* ABSOLUTE_Y_MODE */ 0xFF,
299 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
300 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
301 /* INDIRECT_MODE */ 0xFF,
302 /* RELATIVE_MODE */ 0xFF
303 },
304 /* CLV_MNEMONIC */
305 {
306 /* IMPLIED_MODE */ 0xB8,
307 /* ACCUMULATOR_MODE */ 0xFF,
308 /* IMMEDIATE_MODE */ 0xFF,
309 /* ZEROPAGE_MODE */ 0xFF,
310 /* ZEROPAGE_X_MODE */ 0xFF,
311 /* ZEROPAGE_Y_MODE */ 0xFF,
312 /* ABSOLUTE_MODE */ 0xFF,
313 /* ABSOLUTE_X_MODE */ 0xFF,
314 /* ABSOLUTE_Y_MODE */ 0xFF,
315 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
316 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
317 /* INDIRECT_MODE */ 0xFF,
318 /* RELATIVE_MODE */ 0xFF
319 },
320 /* CMP_MNEMONIC */
321 {
322 /* IMPLIED_MODE */ 0xFF,
323 /* ACCUMULATOR_MODE */ 0xFF,
324 /* IMMEDIATE_MODE */ 0xC9,
325 /* ZEROPAGE_MODE */ 0xC5,
326 /* ZEROPAGE_X_MODE */ 0xD5,
327 /* ZEROPAGE_Y_MODE */ 0xFF,
328 /* ABSOLUTE_MODE */ 0xCD,
329 /* ABSOLUTE_X_MODE */ 0xDD,
330 /* ABSOLUTE_Y_MODE */ 0xD9,
331 /* PREINDEXED_INDIRECT_MODE */ 0xC1,
332 /* POSTINDEXED_INDIRECT_MODE */ 0xD1,
333 /* INDIRECT_MODE */ 0xFF,
334 /* RELATIVE_MODE */ 0xFF
335 },
336 /* CPX_MNEMONIC */
337 {
338 /* IMPLIED_MODE */ 0xFF,
339 /* ACCUMULATOR_MODE */ 0xFF,
340 /* IMMEDIATE_MODE */ 0xE0,
341 /* ZEROPAGE_MODE */ 0xE4,
342 /* ZEROPAGE_X_MODE */ 0xFF,
343 /* ZEROPAGE_Y_MODE */ 0xFF,
344 /* ABSOLUTE_MODE */ 0xEC,
345 /* ABSOLUTE_X_MODE */ 0xFF,
346 /* ABSOLUTE_Y_MODE */ 0xFF,
347 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
348 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
349 /* INDIRECT_MODE */ 0xFF,
350 /* RELATIVE_MODE */ 0xFF
351 },
352 /* CPY_MNEMONIC */
353 {
354 /* IMPLIED_MODE */ 0xFF,
355 /* ACCUMULATOR_MODE */ 0xFF,
356 /* IMMEDIATE_MODE */ 0xC0,
357 /* ZEROPAGE_MODE */ 0xC4,
358 /* ZEROPAGE_X_MODE */ 0xFF,
359 /* ZEROPAGE_Y_MODE */ 0xFF,
360 /* ABSOLUTE_MODE */ 0xCC,
361 /* ABSOLUTE_X_MODE */ 0xFF,
362 /* ABSOLUTE_Y_MODE */ 0xFF,
363 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
364 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
365 /* INDIRECT_MODE */ 0xFF,
366 /* RELATIVE_MODE */ 0xFF
367 },
368 /* DEC_MNEMONIC */
369 {
370 /* IMPLIED_MODE */ 0xFF,
371 /* ACCUMULATOR_MODE */ 0xFF,
372 /* IMMEDIATE_MODE */ 0xFF,
373 /* ZEROPAGE_MODE */ 0xC6,
374 /* ZEROPAGE_X_MODE */ 0xD6,
375 /* ZEROPAGE_Y_MODE */ 0xFF,
376 /* ABSOLUTE_MODE */ 0xCE,
377 /* ABSOLUTE_X_MODE */ 0xDE,
378 /* ABSOLUTE_Y_MODE */ 0xFF,
379 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
380 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
381 /* INDIRECT_MODE */ 0xFF,
382 /* RELATIVE_MODE */ 0xFF
383 },
384 /* DEX_MNEMONIC */
385 {
386 /* IMPLIED_MODE */ 0xCA,
387 /* ACCUMULATOR_MODE */ 0xFF,
388 /* IMMEDIATE_MODE */ 0xFF,
389 /* ZEROPAGE_MODE */ 0xFF,
390 /* ZEROPAGE_X_MODE */ 0xFF,
391 /* ZEROPAGE_Y_MODE */ 0xFF,
392 /* ABSOLUTE_MODE */ 0xFF,
393 /* ABSOLUTE_X_MODE */ 0xFF,
394 /* ABSOLUTE_Y_MODE */ 0xFF,
395 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
396 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
397 /* INDIRECT_MODE */ 0xFF,
398 /* RELATIVE_MODE */ 0xFF
399 },
400 /* DEY_MNEMONIC */
401 {
402 /* IMPLIED_MODE */ 0x88,
403 /* ACCUMULATOR_MODE */ 0xFF,
404 /* IMMEDIATE_MODE */ 0xFF,
405 /* ZEROPAGE_MODE */ 0xFF,
406 /* ZEROPAGE_X_MODE */ 0xFF,
407 /* ZEROPAGE_Y_MODE */ 0xFF,
408 /* ABSOLUTE_MODE */ 0xFF,
409 /* ABSOLUTE_X_MODE */ 0xFF,
410 /* ABSOLUTE_Y_MODE */ 0xFF,
411 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
412 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
413 /* INDIRECT_MODE */ 0xFF,
414 /* RELATIVE_MODE */ 0xFF
415 },
416 /* EOR_MNEMONIC */
417 {
418 /* IMPLIED_MODE */ 0xFF,
419 /* ACCUMULATOR_MODE */ 0xFF,
420 /* IMMEDIATE_MODE */ 0x49,
421 /* ZEROPAGE_MODE */ 0x45,
422 /* ZEROPAGE_X_MODE */ 0x55,
423 /* ZEROPAGE_Y_MODE */ 0xFF,
424 /* ABSOLUTE_MODE */ 0x4D,
425 /* ABSOLUTE_X_MODE */ 0x5D,
426 /* ABSOLUTE_Y_MODE */ 0x59,
427 /* PREINDEXED_INDIRECT_MODE */ 0x41,
428 /* POSTINDEXED_INDIRECT_MODE */ 0x51,
429 /* INDIRECT_MODE */ 0xFF,
430 /* RELATIVE_MODE */ 0xFF
431 },
432 /* INC_MNEMONIC */
433 {
434 /* IMPLIED_MODE */ 0xFF,
435 /* ACCUMULATOR_MODE */ 0xFF,
436 /* IMMEDIATE_MODE */ 0xFF,
437 /* ZEROPAGE_MODE */ 0xE6,
438 /* ZEROPAGE_X_MODE */ 0xF6,
439 /* ZEROPAGE_Y_MODE */ 0xFF,
440 /* ABSOLUTE_MODE */ 0xEE,
441 /* ABSOLUTE_X_MODE */ 0xFE,
442 /* ABSOLUTE_Y_MODE */ 0xFF,
443 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
444 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
445 /* INDIRECT_MODE */ 0xFF,
446 /* RELATIVE_MODE */ 0xFF
447 },
448 /* INX_MNEMONIC */
449 {
450 /* IMPLIED_MODE */ 0xE8,
451 /* ACCUMULATOR_MODE */ 0xFF,
452 /* IMMEDIATE_MODE */ 0xFF,
453 /* ZEROPAGE_MODE */ 0xFF,
454 /* ZEROPAGE_X_MODE */ 0xFF,
455 /* ZEROPAGE_Y_MODE */ 0xFF,
456 /* ABSOLUTE_MODE */ 0xFF,
457 /* ABSOLUTE_X_MODE */ 0xFF,
458 /* ABSOLUTE_Y_MODE */ 0xFF,
459 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
460 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
461 /* INDIRECT_MODE */ 0xFF,
462 /* RELATIVE_MODE */ 0xFF
463 },
464 /* INY_MNEMONIC */
465 {
466 /* IMPLIED_MODE */ 0xC8,
467 /* ACCUMULATOR_MODE */ 0xFF,
468 /* IMMEDIATE_MODE */ 0xFF,
469 /* ZEROPAGE_MODE */ 0xFF,
470 /* ZEROPAGE_X_MODE */ 0xFF,
471 /* ZEROPAGE_Y_MODE */ 0xFF,
472 /* ABSOLUTE_MODE */ 0xFF,
473 /* ABSOLUTE_X_MODE */ 0xFF,
474 /* ABSOLUTE_Y_MODE */ 0xFF,
475 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
476 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
477 /* INDIRECT_MODE */ 0xFF,
478 /* RELATIVE_MODE */ 0xFF
479 },
480 /* JMP_MNEMONIC */
481 {
482 /* IMPLIED_MODE */ 0xFF,
483 /* ACCUMULATOR_MODE */ 0xFF,
484 /* IMMEDIATE_MODE */ 0xFF,
485 /* ZEROPAGE_MODE */ 0xFF,
486 /* ZEROPAGE_X_MODE */ 0xFF,
487 /* ZEROPAGE_Y_MODE */ 0xFF,
488 /* ABSOLUTE_MODE */ 0x4C,
489 /* ABSOLUTE_X_MODE */ 0xFF,
490 /* ABSOLUTE_Y_MODE */ 0xFF,
491 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
492 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
493 /* INDIRECT_MODE */ 0x6C,
494 /* RELATIVE_MODE */ 0xFF
495 },
496 /* JSR_MNEMONIC */
497 {
498 /* IMPLIED_MODE */ 0xFF,
499 /* ACCUMULATOR_MODE */ 0xFF,
500 /* IMMEDIATE_MODE */ 0xFF,
501 /* ZEROPAGE_MODE */ 0xFF,
502 /* ZEROPAGE_X_MODE */ 0xFF,
503 /* ZEROPAGE_Y_MODE */ 0xFF,
504 /* ABSOLUTE_MODE */ 0x20,
505 /* ABSOLUTE_X_MODE */ 0xFF,
506 /* ABSOLUTE_Y_MODE */ 0xFF,
507 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
508 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
509 /* INDIRECT_MODE */ 0xFF,
510 /* RELATIVE_MODE */ 0xFF
511 },
512 /* LDA_MNEMONIC */
513 {
514 /* IMPLIED_MODE */ 0xFF,
515 /* ACCUMULATOR_MODE */ 0xFF,
516 /* IMMEDIATE_MODE */ 0xA9,
517 /* ZEROPAGE_MODE */ 0xA5,
518 /* ZEROPAGE_X_MODE */ 0xB5,
519 /* ZEROPAGE_Y_MODE */ 0xFF,
520 /* ABSOLUTE_MODE */ 0xAD,
521 /* ABSOLUTE_X_MODE */ 0xBD,
522 /* ABSOLUTE_Y_MODE */ 0xB9,
523 /* PREINDEXED_INDIRECT_MODE */ 0xA1,
524 /* POSTINDEXED_INDIRECT_MODE */ 0xB1,
525 /* INDIRECT_MODE */ 0xFF,
526 /* RELATIVE_MODE */ 0xFF
527 },
528 /* LDX_MNEMONIC */
529 {
530 /* IMPLIED_MODE */ 0xFF,
531 /* ACCUMULATOR_MODE */ 0xFF,
532 /* IMMEDIATE_MODE */ 0xA2,
533 /* ZEROPAGE_MODE */ 0xA6,
534 /* ZEROPAGE_X_MODE */ 0xFF,
535 /* ZEROPAGE_Y_MODE */ 0xB6,
536 /* ABSOLUTE_MODE */ 0xAE,
537 /* ABSOLUTE_X_MODE */ 0xFF,
538 /* ABSOLUTE_Y_MODE */ 0xBE,
539 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
540 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
541 /* INDIRECT_MODE */ 0xFF,
542 /* RELATIVE_MODE */ 0xFF
543 },
544 /* LDY_MNEMONIC */
545 {
546 /* IMPLIED_MODE */ 0xFF,
547 /* ACCUMULATOR_MODE */ 0xFF,
548 /* IMMEDIATE_MODE */ 0xA0,
549 /* ZEROPAGE_MODE */ 0xA4,
550 /* ZEROPAGE_X_MODE */ 0xB4,
551 /* ZEROPAGE_Y_MODE */ 0xFF,
552 /* ABSOLUTE_MODE */ 0xAC,
553 /* ABSOLUTE_X_MODE */ 0xBC,
554 /* ABSOLUTE_Y_MODE */ 0xFF,
555 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
556 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
557 /* INDIRECT_MODE */ 0xFF,
558 /* RELATIVE_MODE */ 0xFF
559 },
560 /* LSR_MNEMONIC */
561 {
562 /* IMPLIED_MODE */ 0x4A,
563 /* ACCUMULATOR_MODE */ 0x4A,
564 /* IMMEDIATE_MODE */ 0xFF,
565 /* ZEROPAGE_MODE */ 0x46,
566 /* ZEROPAGE_X_MODE */ 0x56,
567 /* ZEROPAGE_Y_MODE */ 0xFF,
568 /* ABSOLUTE_MODE */ 0x4E,
569 /* ABSOLUTE_X_MODE */ 0x5E,
570 /* ABSOLUTE_Y_MODE */ 0xFF,
571 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
572 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
573 /* INDIRECT_MODE */ 0xFF,
574 /* RELATIVE_MODE */ 0xFF
575 },
576 /* NOP_MNEMONIC */
577 {
578 /* IMPLIED_MODE */ 0xEA,
579 /* ACCUMULATOR_MODE */ 0xFF,
580 /* IMMEDIATE_MODE */ 0xFF,
581 /* ZEROPAGE_MODE */ 0xFF,
582 /* ZEROPAGE_X_MODE */ 0xFF,
583 /* ZEROPAGE_Y_MODE */ 0xFF,
584 /* ABSOLUTE_MODE */ 0xFF,
585 /* ABSOLUTE_X_MODE */ 0xFF,
586 /* ABSOLUTE_Y_MODE */ 0xFF,
587 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
588 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
589 /* INDIRECT_MODE */ 0xFF,
590 /* RELATIVE_MODE */ 0xFF
591 },
592 /* ORA_MNEMONIC */
593 {
594 /* IMPLIED_MODE */ 0xFF,
595 /* ACCUMULATOR_MODE */ 0xFF,
596 /* IMMEDIATE_MODE */ 0x09,
597 /* ZEROPAGE_MODE */ 0x05,
598 /* ZEROPAGE_X_MODE */ 0x15,
599 /* ZEROPAGE_Y_MODE */ 0xFF,
600 /* ABSOLUTE_MODE */ 0x0D,
601 /* ABSOLUTE_X_MODE */ 0x1D,
602 /* ABSOLUTE_Y_MODE */ 0x19,
603 /* PREINDEXED_INDIRECT_MODE */ 0x01,
604 /* POSTINDEXED_INDIRECT_MODE */ 0x11,
605 /* INDIRECT_MODE */ 0xFF,
606 /* RELATIVE_MODE */ 0xFF
607 },
608 /* PHA_MNEMONIC */
609 {
610 /* IMPLIED_MODE */ 0x48,
611 /* ACCUMULATOR_MODE */ 0xFF,
612 /* IMMEDIATE_MODE */ 0xFF,
613 /* ZEROPAGE_MODE */ 0xFF,
614 /* ZEROPAGE_X_MODE */ 0xFF,
615 /* ZEROPAGE_Y_MODE */ 0xFF,
616 /* ABSOLUTE_MODE */ 0xFF,
617 /* ABSOLUTE_X_MODE */ 0xFF,
618 /* ABSOLUTE_Y_MODE */ 0xFF,
619 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
620 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
621 /* INDIRECT_MODE */ 0xFF,
622 /* RELATIVE_MODE */ 0xFF
623 },
624 /* PHP_MNEMONIC */
625 {
626 /* IMPLIED_MODE */ 0x08,
627 /* ACCUMULATOR_MODE */ 0xFF,
628 /* IMMEDIATE_MODE */ 0xFF,
629 /* ZEROPAGE_MODE */ 0xFF,
630 /* ZEROPAGE_X_MODE */ 0xFF,
631 /* ZEROPAGE_Y_MODE */ 0xFF,
632 /* ABSOLUTE_MODE */ 0xFF,
633 /* ABSOLUTE_X_MODE */ 0xFF,
634 /* ABSOLUTE_Y_MODE */ 0xFF,
635 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
636 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
637 /* INDIRECT_MODE */ 0xFF,
638 /* RELATIVE_MODE */ 0xFF
639 },
640 /* PLA_MNEMONIC */
641 {
642 /* IMPLIED_MODE */ 0x68,
643 /* ACCUMULATOR_MODE */ 0xFF,
644 /* IMMEDIATE_MODE */ 0xFF,
645 /* ZEROPAGE_MODE */ 0xFF,
646 /* ZEROPAGE_X_MODE */ 0xFF,
647 /* ZEROPAGE_Y_MODE */ 0xFF,
648 /* ABSOLUTE_MODE */ 0xFF,
649 /* ABSOLUTE_X_MODE */ 0xFF,
650 /* ABSOLUTE_Y_MODE */ 0xFF,
651 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
652 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
653 /* INDIRECT_MODE */ 0xFF,
654 /* RELATIVE_MODE */ 0xFF
655 },
656 /* PLP_MNEMONIC */
657 {
658 /* IMPLIED_MODE */ 0x28,
659 /* ACCUMULATOR_MODE */ 0xFF,
660 /* IMMEDIATE_MODE */ 0xFF,
661 /* ZEROPAGE_MODE */ 0xFF,
662 /* ZEROPAGE_X_MODE */ 0xFF,
663 /* ZEROPAGE_Y_MODE */ 0xFF,
664 /* ABSOLUTE_MODE */ 0xFF,
665 /* ABSOLUTE_X_MODE */ 0xFF,
666 /* ABSOLUTE_Y_MODE */ 0xFF,
667 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
668 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
669 /* INDIRECT_MODE */ 0xFF,
670 /* RELATIVE_MODE */ 0xFF
671 },
672 /* ROL_MNEMONIC */
673 {
674 /* IMPLIED_MODE */ 0x2A,
675 /* ACCUMULATOR_MODE */ 0x2A,
676 /* IMMEDIATE_MODE */ 0xFF,
677 /* ZEROPAGE_MODE */ 0x26,
678 /* ZEROPAGE_X_MODE */ 0x36,
679 /* ZEROPAGE_Y_MODE */ 0xFF,
680 /* ABSOLUTE_MODE */ 0x2E,
681 /* ABSOLUTE_X_MODE */ 0x3E,
682 /* ABSOLUTE_Y_MODE */ 0xFF,
683 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
684 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
685 /* INDIRECT_MODE */ 0xFF,
686 /* RELATIVE_MODE */ 0xFF
687 },
688 /* ROR_MNEMONIC */
689 {
690 /* IMPLIED_MODE */ 0x6A,
691 /* ACCUMULATOR_MODE */ 0x6A,
692 /* IMMEDIATE_MODE */ 0xFF,
693 /* ZEROPAGE_MODE */ 0x66,
694 /* ZEROPAGE_X_MODE */ 0x76,
695 /* ZEROPAGE_Y_MODE */ 0xFF,
696 /* ABSOLUTE_MODE */ 0x6E,
697 /* ABSOLUTE_X_MODE */ 0x7E,
698 /* ABSOLUTE_Y_MODE */ 0xFF,
699 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
700 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
701 /* INDIRECT_MODE */ 0xFF,
702 /* RELATIVE_MODE */ 0xFF
703 },
704 /* RTI_MNEMONIC */
705 {
706 /* IMPLIED_MODE */ 0x40,
707 /* ACCUMULATOR_MODE */ 0xFF,
708 /* IMMEDIATE_MODE */ 0xFF,
709 /* ZEROPAGE_MODE */ 0xFF,
710 /* ZEROPAGE_X_MODE */ 0xFF,
711 /* ZEROPAGE_Y_MODE */ 0xFF,
712 /* ABSOLUTE_MODE */ 0xFF,
713 /* ABSOLUTE_X_MODE */ 0xFF,
714 /* ABSOLUTE_Y_MODE */ 0xFF,
715 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
716 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
717 /* INDIRECT_MODE */ 0xFF,
718 /* RELATIVE_MODE */ 0xFF
719 },
720 /* RTS_MNEMONIC */
721 {
722 /* IMPLIED_MODE */ 0x60,
723 /* ACCUMULATOR_MODE */ 0xFF,
724 /* IMMEDIATE_MODE */ 0xFF,
725 /* ZEROPAGE_MODE */ 0xFF,
726 /* ZEROPAGE_X_MODE */ 0xFF,
727 /* ZEROPAGE_Y_MODE */ 0xFF,
728 /* ABSOLUTE_MODE */ 0xFF,
729 /* ABSOLUTE_X_MODE */ 0xFF,
730 /* ABSOLUTE_Y_MODE */ 0xFF,
731 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
732 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
733 /* INDIRECT_MODE */ 0xFF,
734 /* RELATIVE_MODE */ 0xFF
735 },
736 /* SBC_MNEMONIC */
737 {
738 /* IMPLIED_MODE */ 0xFF,
739 /* ACCUMULATOR_MODE */ 0xFF,
740 /* IMMEDIATE_MODE */ 0xE9,
741 /* ZEROPAGE_MODE */ 0xE5,
742 /* ZEROPAGE_X_MODE */ 0xF5,
743 /* ZEROPAGE_Y_MODE */ 0xFF,
744 /* ABSOLUTE_MODE */ 0xED,
745 /* ABSOLUTE_X_MODE */ 0xFD,
746 /* ABSOLUTE_Y_MODE */ 0xF9,
747 /* PREINDEXED_INDIRECT_MODE */ 0xE1,
748 /* POSTINDEXED_INDIRECT_MODE */ 0xF1,
749 /* INDIRECT_MODE */ 0xFF,
750 /* RELATIVE_MODE */ 0xFF
751 },
752 /* SEC_MNEMONIC */
753 {
754 /* IMPLIED_MODE */ 0x38,
755 /* ACCUMULATOR_MODE */ 0xFF,
756 /* IMMEDIATE_MODE */ 0xFF,
757 /* ZEROPAGE_MODE */ 0xFF,
758 /* ZEROPAGE_X_MODE */ 0xFF,
759 /* ZEROPAGE_Y_MODE */ 0xFF,
760 /* ABSOLUTE_MODE */ 0xFF,
761 /* ABSOLUTE_X_MODE */ 0xFF,
762 /* ABSOLUTE_Y_MODE */ 0xFF,
763 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
764 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
765 /* INDIRECT_MODE */ 0xFF,
766 /* RELATIVE_MODE */ 0xFF
767 },
768 /* SED_MNEMONIC */
769 {
770 /* IMPLIED_MODE */ 0xF8,
771 /* ACCUMULATOR_MODE */ 0xFF,
772 /* IMMEDIATE_MODE */ 0xFF,
773 /* ZEROPAGE_MODE */ 0xFF,
774 /* ZEROPAGE_X_MODE */ 0xFF,
775 /* ZEROPAGE_Y_MODE */ 0xFF,
776 /* ABSOLUTE_MODE */ 0xFF,
777 /* ABSOLUTE_X_MODE */ 0xFF,
778 /* ABSOLUTE_Y_MODE */ 0xFF,
779 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
780 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
781 /* INDIRECT_MODE */ 0xFF,
782 /* RELATIVE_MODE */ 0xFF
783 },
784 /* SEI_MNEMONIC */
785 {
786 /* IMPLIED_MODE */ 0x78,
787 /* ACCUMULATOR_MODE */ 0xFF,
788 /* IMMEDIATE_MODE */ 0xFF,
789 /* ZEROPAGE_MODE */ 0xFF,
790 /* ZEROPAGE_X_MODE */ 0xFF,
791 /* ZEROPAGE_Y_MODE */ 0xFF,
792 /* ABSOLUTE_MODE */ 0xFF,
793 /* ABSOLUTE_X_MODE */ 0xFF,
794 /* ABSOLUTE_Y_MODE */ 0xFF,
795 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
796 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
797 /* INDIRECT_MODE */ 0xFF,
798 /* RELATIVE_MODE */ 0xFF
799 },
800 /* STA_MNEMONIC */
801 {
802 /* IMPLIED_MODE */ 0xFF,
803 /* ACCUMULATOR_MODE */ 0xFF,
804 /* IMMEDIATE_MODE */ 0xFF,
805 /* ZEROPAGE_MODE */ 0x85,
806 /* ZEROPAGE_X_MODE */ 0x95,
807 /* ZEROPAGE_Y_MODE */ 0xFF,
808 /* ABSOLUTE_MODE */ 0x8D,
809 /* ABSOLUTE_X_MODE */ 0x9D,
810 /* ABSOLUTE_Y_MODE */ 0x99,
811 /* PREINDEXED_INDIRECT_MODE */ 0x81,
812 /* POSTINDEXED_INDIRECT_MODE */ 0x91,
813 /* INDIRECT_MODE */ 0xFF,
814 /* RELATIVE_MODE */ 0xFF
815 },
816 /* STX_MNEMONIC */
817 {
818 /* IMPLIED_MODE */ 0xFF,
819 /* ACCUMULATOR_MODE */ 0xFF,
820 /* IMMEDIATE_MODE */ 0xFF,
821 /* ZEROPAGE_MODE */ 0x86,
822 /* ZEROPAGE_X_MODE */ 0xFF,
823 /* ZEROPAGE_Y_MODE */ 0x96,
824 /* ABSOLUTE_MODE */ 0x8E,
825 /* ABSOLUTE_X_MODE */ 0xFF,
826 /* ABSOLUTE_Y_MODE */ 0xFF,
827 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
828 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
829 /* INDIRECT_MODE */ 0xFF,
830 /* RELATIVE_MODE */ 0xFF
831 },
832 /* STY_MNEMONIC */
833 {
834 /* IMPLIED_MODE */ 0xFF,
835 /* ACCUMULATOR_MODE */ 0xFF,
836 /* IMMEDIATE_MODE */ 0xFF,
837 /* ZEROPAGE_MODE */ 0x84,
838 /* ZEROPAGE_X_MODE */ 0x94,
839 /* ZEROPAGE_Y_MODE */ 0xFF,
840 /* ABSOLUTE_MODE */ 0x8C,
841 /* ABSOLUTE_X_MODE */ 0xFF,
842 /* ABSOLUTE_Y_MODE */ 0xFF,
843 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
844 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
845 /* INDIRECT_MODE */ 0xFF,
846 /* RELATIVE_MODE */ 0xFF
847 },
848 /* TAX_MNEMONIC */
849 {
850 /* IMPLIED_MODE */ 0xAA,
851 /* ACCUMULATOR_MODE */ 0xFF,
852 /* IMMEDIATE_MODE */ 0xFF,
853 /* ZEROPAGE_MODE */ 0xFF,
854 /* ZEROPAGE_X_MODE */ 0xFF,
855 /* ZEROPAGE_Y_MODE */ 0xFF,
856 /* ABSOLUTE_MODE */ 0xFF,
857 /* ABSOLUTE_X_MODE */ 0xFF,
858 /* ABSOLUTE_Y_MODE */ 0xFF,
859 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
860 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
861 /* INDIRECT_MODE */ 0xFF,
862 /* RELATIVE_MODE */ 0xFF
863 },
864 /* TAY_MNEMONIC */
865 {
866 /* IMPLIED_MODE */ 0xA8,
867 /* ACCUMULATOR_MODE */ 0xFF,
868 /* IMMEDIATE_MODE */ 0xFF,
869 /* ZEROPAGE_MODE */ 0xFF,
870 /* ZEROPAGE_X_MODE */ 0xFF,
871 /* ZEROPAGE_Y_MODE */ 0xFF,
872 /* ABSOLUTE_MODE */ 0xFF,
873 /* ABSOLUTE_X_MODE */ 0xFF,
874 /* ABSOLUTE_Y_MODE */ 0xFF,
875 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
876 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
877 /* INDIRECT_MODE */ 0xFF,
878 /* RELATIVE_MODE */ 0xFF
879 },
880 /* TSX_MNEMONIC */
881 {
882 /* IMPLIED_MODE */ 0xBA,
883 /* ACCUMULATOR_MODE */ 0xFF,
884 /* IMMEDIATE_MODE */ 0xFF,
885 /* ZEROPAGE_MODE */ 0xFF,
886 /* ZEROPAGE_X_MODE */ 0xFF,
887 /* ZEROPAGE_Y_MODE */ 0xFF,
888 /* ABSOLUTE_MODE */ 0xFF,
889 /* ABSOLUTE_X_MODE */ 0xFF,
890 /* ABSOLUTE_Y_MODE */ 0xFF,
891 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
892 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
893 /* INDIRECT_MODE */ 0xFF,
894 /* RELATIVE_MODE */ 0xFF
895 },
896 /* TXA_MNEMONIC */
897 {
898 /* IMPLIED_MODE */ 0x8A,
899 /* ACCUMULATOR_MODE */ 0xFF,
900 /* IMMEDIATE_MODE */ 0xFF,
901 /* ZEROPAGE_MODE */ 0xFF,
902 /* ZEROPAGE_X_MODE */ 0xFF,
903 /* ZEROPAGE_Y_MODE */ 0xFF,
904 /* ABSOLUTE_MODE */ 0xFF,
905 /* ABSOLUTE_X_MODE */ 0xFF,
906 /* ABSOLUTE_Y_MODE */ 0xFF,
907 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
908 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
909 /* INDIRECT_MODE */ 0xFF,
910 /* RELATIVE_MODE */ 0xFF
911 },
912 /* TXS_MNEMONIC */
913 {
914 /* IMPLIED_MODE */ 0x9A,
915 /* ACCUMULATOR_MODE */ 0xFF,
916 /* IMMEDIATE_MODE */ 0xFF,
917 /* ZEROPAGE_MODE */ 0xFF,
918 /* ZEROPAGE_X_MODE */ 0xFF,
919 /* ZEROPAGE_Y_MODE */ 0xFF,
920 /* ABSOLUTE_MODE */ 0xFF,
921 /* ABSOLUTE_X_MODE */ 0xFF,
922 /* ABSOLUTE_Y_MODE */ 0xFF,
923 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
924 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
925 /* INDIRECT_MODE */ 0xFF,
926 /* RELATIVE_MODE */ 0xFF
927 },
928 /* TYA_MNEMONIC */
929 {
930 /* IMPLIED_MODE */ 0x98,
931 /* ACCUMULATOR_MODE */ 0xFF,
932 /* IMMEDIATE_MODE */ 0xFF,
933 /* ZEROPAGE_MODE */ 0xFF,
934 /* ZEROPAGE_X_MODE */ 0xFF,
935 /* ZEROPAGE_Y_MODE */ 0xFF,
936 /* ABSOLUTE_MODE */ 0xFF,
937 /* ABSOLUTE_X_MODE */ 0xFF,
938 /* ABSOLUTE_Y_MODE */ 0xFF,
939 /* PREINDEXED_INDIRECT_MODE */ 0xFF,
940 /* POSTINDEXED_INDIRECT_MODE */ 0xFF,
941 /* INDIRECT_MODE */ 0xFF,
942 /* RELATIVE_MODE */ 0xFF
943 }
944 };
945 /* */
946 return opcode_lookup[mnc][amode];
947 }
948
949 /**
950 * Gets the length of an instruction, in bytes, given an opcode.
951 * The length includes the opcode (1 byte) and operand (0, 1 or 2 bytes).
952 * @param op Operation code
953 */
954 int opcode_length(unsigned char op)
955 {
956 /* Lookup-table indexed by opcode */
957 static int length_lookup[] = {
958 1, 2, 0, 0, 0, 2, 2, 0, 1, 2, 1, 0, 0, 3, 3, 0,
959 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0,
960 3, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
961 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0,
962 1, 2, 0, 0, 0, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
963 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0,
964 1, 2, 0, 0, 0, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
965 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0,
966 0, 2, 0, 0, 2, 2, 2, 0, 1, 1, 1, 0, 3, 3, 3, 0,
967 2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 0, 3, 0, 0,
968 2, 2, 2, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
969 2, 2, 0, 0, 2, 2, 2, 0, 1, 3, 1, 0, 3, 3, 3, 0,
970 2, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
971 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0,
972 2, 2, 0, 0, 2, 2, 2, 0, 1, 2, 1, 0, 3, 3, 3, 0,
973 2, 2, 0, 0, 0, 2, 2, 0, 1, 3, 0, 0, 0, 3, 3, 0
974 };
975 /* */
976 return length_lookup[op];
977 }
978
979 /**
980 * Gets the zeropage-equivalent opcode of an absolute-mode opcode, if such a
981 * conversion is possible.
982 * @param op Opcode
983 * @return Equivalent opcode, or 0xFF if one does not exist
984 */
985 unsigned char opcode_zp_equiv(unsigned char op)
986 {
987 switch (op) {
988 case 0x6D: return 0x65; /* ADC oper */
989 case 0x7D: return 0x75; /* ADC oper,X */
990 case 0x2D: return 0x25; /* AND oper */
991 case 0x3D: return 0x35; /* AND oper,X */
992 case 0x0E: return 0x06; /* ASL oper */
993 case 0x1E: return 0x16; /* ASL oper,X */
994 case 0x2C: return 0x24; /* BIT oper */
995 case 0xCD: return 0xC5; /* CMP oper */
996 case 0xDD: return 0xD5; /* CMP oper,X */
997 case 0xEC: return 0xE4; /* CPX oper */
998 case 0xCC: return 0xC4; /* CPY oper */
999 case 0xCE: return 0xC6; /* DEC oper */
1000 case 0xDE: return 0xD6; /* DEC oper,X */
1001 case 0x4D: return 0x45; /* EOR oper */
1002 case 0x5D: return 0x55; /* EOR oper,X */
1003 case 0xEE: return 0xE6; /* INC oper */
1004 case 0xFE: return 0xF6; /* INC oper,X */
1005 case 0xAD: return 0xA5; /* LDA oper */
1006 case 0xBD: return 0xB5; /* LDA oper,X */
1007 case 0xAE: return 0xA6; /* LDX oper */
1008 case 0xBE: return 0xB6; /* LDX oper,Y */
1009 case 0xAC: return 0xA4; /* LDY oper */
1010 case 0xBC: return 0xB4; /* LDY oper,X */
1011 case 0x4E: return 0x46; /* LSR oper */
1012 case 0x5E: return 0x56; /* LSR oper,X */
1013 case 0x0D: return 0x05; /* ORA oper */
1014 case 0x1D: return 0x15; /* ORA oper,X */
1015 case 0x2E: return 0x26; /* ROL oper */
1016 case 0x3E: return 0x36; /* ROL oper,X */
1017 case 0x6E: return 0x66; /* ROR oper */
1018 case 0x7E: return 0x76; /* ROR oper,X */
1019 case 0xED: return 0xE5; /* SBC oper */
1020 case 0xFD: return 0xF5; /* SBC oper,X */
1021 case 0x8D: return 0x85; /* STA oper */
1022 case 0x9D: return 0x95; /* STA oper,X */
1023 case 0x8E: return 0x86; /* STX oper */
1024 case 0x8C: return 0x84; /* STY oper */
1025 }
1026 return 0xFF;
1027 }
1028
1029 /**
1030 * Gets the string mnemonic of a 6502 opcode.
1031 * @param op Opcode
1032 * @return String representation of opcode
1033 */
1034 const char *opcode_to_string(unsigned char op)
1035 {
1036 static char *mnemonic_lookup[] = {
1037 "BRK","ORA","???","???","???","ORA","ASL","???","PHP","ORA","ASL","???","???","ORA","ASL","???",
1038 "BPL","ORA","???","???","???","ORA","ASL","???","CLC","ORA","???","???","???","ORA","ASL","???",
1039 "JSR","AND","???","???","BIT","AND","ROL","???","PLP","AND","ROL","???","BIT","AND","ROL","???",
1040 "BMI","AND","???","???","???","AND","ROL","???","SEC","AND","???","???","???","AND","ROL","???",
1041 "RTI","EOR","???","???","???","EOR","LSR","???","PHA","EOR","LSR","???","JMP","EOR","LSR","???",
1042 "BVC","EOR","???","???","???","EOR","LSR","???","CLI","EOR","???","???","???","EOR","LSR","???",
1043 "RTS","ADC","???","???","???","ADC","ROR","???","PLA","ADC","ROR","???","JMP","ADC","ROR","???",
1044 "BVS","ADC","???","???","???","ADC","ROR","???","SEI","ADC","???","???","???","ADC","ROR","???",
1045 "???","STA","???","???","STY","STA","STX","???","DEY","???","TXA","???","STY","STA","STX","???",
1046 "BCC","STA","???","???","STY","STA","STX","???","TYA","STA","TXS","???","???","STA","???","???",
1047 "LDY","LDA","LDX","???","LDY","LDA","LDX","???","TAY","LDA","TAX","???","LDY","LDA","LDX","???",
1048 "BCS","LDA","???","???","LDY","LDA","LDX","???","CLV","LDA","TSX","???","LDY","LDA","LDX","???",
1049 "CPY","CMP","???","???","CPY","CMP","DEC","???","INY","CMP","DEX","???","CPY","CMP","DEC","???",
1050 "BNE","CMP","???","???","???","CMP","DEC","???","CLD","CMP","???","???","???","CMP","DEC","???",
1051 "CPX","SBC","???","???","CPX","SBC","INC","???","INX","SBC","NOP","???","CPX","SBC","INC","???",
1052 "BEQ","SBC","???","???","???","SBC","INC","???","SED","SBC","???","???","???","SBC","INC","???"
1053 };
1054 return mnemonic_lookup[op];
1055 }
6502 assembler