1/*****************************************************************************/
2/* */
3/* opc6502.c */
4/* */
5/* 6502 opcode description table */
6/* */
7/* */
8/* */
9/* (C) 2003-2011, Ullrich von Bassewitz */
10/* Roemerstrasse 52 */
11/* D-70794 Filderstadt */
12/* EMail: uz@cc65.org */
13/* */
14/* */
15/* This software is provided 'as-is', without any expressed or implied */
16/* warranty. In no event will the authors be held liable for any damages */
17/* arising from the use of this software. */
18/* */
19/* Permission is granted to anyone to use this software for any purpose, */
20/* including commercial applications, and to alter it and redistribute it */
21/* freely, subject to the following restrictions: */
22/* */
23/* 1. The origin of this software must not be misrepresented; you must not */
24/* claim that you wrote the original software. If you use this software */
25/* in a product, an acknowledgment in the product documentation would be */
26/* appreciated but is not required. */
27/* 2. Altered source versions must be plainly marked as such, and must not */
28/* be misrepresented as being the original software. */
29/* 3. This notice may not be removed or altered from any source */
30/* distribution. */
31/* */
32/*****************************************************************************/
33
34
35
36/* da65 */
37#include "handler.h"
38#include "opc6502.h"
39
40
41
42/*****************************************************************************/
43/* Data */
44/*****************************************************************************/
45
46
47
48/* Descriptions for all opcodes */
49const OpcDesc OpcTable_6502[256] = {
50 { "brk", 1, flNone, OH_Implicit }, /* $00 */
51 { "ora", 2, flUseLabel, OH_DirectXIndirect }, /* $01 */
52 { "", 1, flIllegal, OH_Illegal, }, /* $02 */
53 { "", 1, flIllegal, OH_Illegal, }, /* $03 */
54 { "", 1, flIllegal, OH_Illegal, }, /* $04 */
55 { "ora", 2, flUseLabel, OH_Direct }, /* $05 */
56 { "asl", 2, flUseLabel, OH_Direct }, /* $06 */
57 { "", 1, flIllegal, OH_Illegal, }, /* $07 */
58 { "php", 1, flNone, OH_Implicit }, /* $08 */
59 { "ora", 2, flNone, OH_Immediate }, /* $09 */
60 { "asl", 1, flNone, OH_Accumulator }, /* $0a */
61 { "", 1, flIllegal, OH_Illegal, }, /* $0b */
62 { "", 1, flIllegal, OH_Illegal, }, /* $0c */
63 { "ora", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $0d */
64 { "asl", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $0e */
65 { "", 1, flIllegal, OH_Illegal, }, /* $0f */
66 { "bpl", 2, flLabel, OH_Relative }, /* $10 */
67 { "ora", 2, flUseLabel, OH_DirectIndirectY }, /* $11 */
68 { "", 1, flIllegal, OH_Illegal, }, /* $12 */
69 { "", 1, flIllegal, OH_Illegal, }, /* $13 */
70 { "", 1, flIllegal, OH_Illegal, }, /* $14 */
71 { "ora", 2, flUseLabel, OH_DirectX }, /* $15 */
72 { "asl", 2, flUseLabel, OH_DirectX }, /* $16 */
73 { "", 1, flIllegal, OH_Illegal, }, /* $17 */
74 { "clc", 1, flNone, OH_Implicit }, /* $18 */
75 { "ora", 3, flUseLabel, OH_AbsoluteY }, /* $19 */
76 { "", 1, flIllegal, OH_Illegal, }, /* $1a */
77 { "", 1, flIllegal, OH_Illegal, }, /* $1b */
78 { "", 1, flIllegal, OH_Illegal, }, /* $1c */
79 { "ora", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $1d */
80 { "asl", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $1e */
81 { "", 1, flIllegal, OH_Illegal, }, /* $1f */
82 { "jsr", 3, flLabel, OH_JsrAbsolute }, /* $20 */
83 { "and", 2, flUseLabel, OH_DirectXIndirect }, /* $21 */
84 { "", 1, flIllegal, OH_Illegal, }, /* $22 */
85 { "", 1, flIllegal, OH_Illegal, }, /* $23 */
86 { "bit", 2, flUseLabel, OH_Direct }, /* $24 */
87 { "and", 2, flUseLabel, OH_Direct }, /* $25 */
88 { "rol", 2, flUseLabel, OH_Direct }, /* $26 */
89 { "", 1, flIllegal, OH_Illegal, }, /* $27 */
90 { "plp", 1, flNone, OH_Implicit }, /* $28 */
91 { "and", 2, flNone, OH_Immediate }, /* $29 */
92 { "rol", 1, flNone, OH_Accumulator }, /* $2a */
93 { "", 1, flIllegal, OH_Illegal, }, /* $2b */
94 { "bit", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $2c */
95 { "and", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $2d */
96 { "rol", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $2e */
97 { "", 1, flIllegal, OH_Illegal, }, /* $2f */
98 { "bmi", 2, flLabel, OH_Relative }, /* $30 */
99 { "and", 2, flUseLabel, OH_DirectIndirectY }, /* $31 */
100 { "", 1, flIllegal, OH_Illegal, }, /* $32 */
101 { "", 1, flIllegal, OH_Illegal, }, /* $33 */
102 { "", 1, flIllegal, OH_Illegal, }, /* $34 */
103 { "and", 2, flUseLabel, OH_DirectX }, /* $35 */
104 { "rol", 2, flUseLabel, OH_DirectX }, /* $36 */
105 { "", 1, flIllegal, OH_Illegal, }, /* $37 */
106 { "sec", 1, flNone, OH_Implicit }, /* $38 */
107 { "and", 3, flUseLabel, OH_AbsoluteY }, /* $39 */
108 { "", 1, flIllegal, OH_Illegal, }, /* $3a */
109 { "", 1, flIllegal, OH_Illegal, }, /* $3b */
110 { "", 1, flIllegal, OH_Illegal, }, /* $3c */
111 { "and", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $3d */
112 { "rol", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $3e */
113 { "", 1, flIllegal, OH_Illegal, }, /* $3f */
114 { "rti", 1, flNone, OH_Rts }, /* $40 */
115 { "eor", 2, flUseLabel, OH_DirectXIndirect }, /* $41 */
116 { "", 1, flIllegal, OH_Illegal, }, /* $42 */
117 { "", 1, flIllegal, OH_Illegal, }, /* $43 */
118 { "", 1, flIllegal, OH_Illegal, }, /* $44 */
119 { "eor", 2, flUseLabel, OH_Direct }, /* $45 */
120 { "lsr", 2, flUseLabel, OH_Direct }, /* $46 */
121 { "", 1, flIllegal, OH_Illegal, }, /* $47 */
122 { "pha", 1, flNone, OH_Implicit }, /* $48 */
123 { "eor", 2, flNone, OH_Immediate }, /* $49 */
124 { "lsr", 1, flNone, OH_Accumulator }, /* $4a */
125 { "", 1, flIllegal, OH_Illegal, }, /* $4b */
126 { "jmp", 3, flLabel, OH_JmpAbsolute }, /* $4c */
127 { "eor", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $4d */
128 { "lsr", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $4e */
129 { "", 1, flIllegal, OH_Illegal, }, /* $4f */
130 { "bvc", 2, flLabel, OH_Relative }, /* $50 */
131 { "eor", 2, flUseLabel, OH_DirectIndirectY }, /* $51 */
132 { "", 1, flIllegal, OH_Illegal, }, /* $52 */
133 { "", 1, flIllegal, OH_Illegal, }, /* $53 */
134 { "", 1, flIllegal, OH_Illegal, }, /* $54 */
135 { "eor", 2, flUseLabel, OH_DirectX }, /* $55 */
136 { "lsr", 2, flUseLabel, OH_DirectX }, /* $56 */
137 { "", 1, flIllegal, OH_Illegal, }, /* $57 */
138 { "cli", 1, flNone, OH_Implicit }, /* $58 */
139 { "eor", 3, flUseLabel, OH_AbsoluteY }, /* $59 */
140 { "", 1, flIllegal, OH_Illegal, }, /* $5a */
141 { "", 1, flIllegal, OH_Illegal, }, /* $5b */
142 { "", 1, flIllegal, OH_Illegal, }, /* $5c */
143 { "eor", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $5d */
144 { "lsr", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $5e */
145 { "", 1, flIllegal, OH_Illegal, }, /* $5f */
146 { "rts", 1, flNone, OH_Rts }, /* $60 */
147 { "adc", 2, flUseLabel, OH_DirectXIndirect }, /* $61 */
148 { "", 1, flIllegal, OH_Illegal, }, /* $62 */
149 { "", 1, flIllegal, OH_Illegal, }, /* $63 */
150 { "", 1, flIllegal, OH_Illegal, }, /* $64 */
151 { "adc", 2, flUseLabel, OH_Direct }, /* $65 */
152 { "ror", 2, flUseLabel, OH_Direct }, /* $66 */
153 { "", 1, flIllegal, OH_Illegal, }, /* $67 */
154 { "pla", 1, flNone, OH_Implicit }, /* $68 */
155 { "adc", 2, flNone, OH_Immediate }, /* $69 */
156 { "ror", 1, flNone, OH_Accumulator }, /* $6a */
157 { "", 1, flIllegal, OH_Illegal, }, /* $6b */
158 { "jmp", 3, flLabel, OH_JmpAbsoluteIndirect }, /* $6c */
159 { "adc", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $6d */
160 { "ror", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $6e */
161 { "", 1, flIllegal, OH_Illegal, }, /* $6f */
162 { "bvs", 2, flLabel, OH_Relative }, /* $70 */
163 { "adc", 2, flUseLabel, OH_DirectIndirectY }, /* $71 */
164 { "", 1, flIllegal, OH_Illegal, }, /* $72 */
165 { "", 1, flIllegal, OH_Illegal, }, /* $73 */
166 { "", 1, flIllegal, OH_Illegal, }, /* $74 */
167 { "adc", 2, flUseLabel, OH_DirectX }, /* $75 */
168 { "ror", 2, flUseLabel, OH_DirectX }, /* $76 */
169 { "", 1, flIllegal, OH_Illegal, }, /* $77 */
170 { "sei", 1, flNone, OH_Implicit }, /* $78 */
171 { "adc", 3, flUseLabel, OH_AbsoluteY }, /* $79 */
172 { "", 1, flIllegal, OH_Illegal, }, /* $7a */
173 { "", 1, flIllegal, OH_Illegal, }, /* $7b */
174 { "", 1, flIllegal, OH_Illegal, }, /* $7c */
175 { "adc", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $7d */
176 { "ror", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $7e */
177 { "", 1, flIllegal, OH_Illegal, }, /* $7f */
178 { "", 1, flIllegal, OH_Illegal, }, /* $80 */
179 { "sta", 2, flUseLabel, OH_DirectXIndirect }, /* $81 */
180 { "", 1, flIllegal, OH_Illegal, }, /* $82 */
181 { "", 1, flIllegal, OH_Illegal, }, /* $83 */
182 { "sty", 2, flUseLabel, OH_Direct }, /* $84 */
183 { "sta", 2, flUseLabel, OH_Direct }, /* $85 */
184 { "stx", 2, flUseLabel, OH_Direct }, /* $86 */
185 { "", 1, flIllegal, OH_Illegal, }, /* $87 */
186 { "dey", 1, flNone, OH_Implicit }, /* $88 */
187 { "", 1, flIllegal, OH_Illegal, }, /* $89 */
188 { "txa", 1, flNone, OH_Implicit }, /* $8a */
189 { "", 1, flIllegal, OH_Illegal, }, /* $8b */
190 { "sty", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $8c */
191 { "sta", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $8d */
192 { "stx", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $8e */
193 { "", 1, flIllegal, OH_Illegal, }, /* $8f */
194 { "bcc", 2, flLabel, OH_Relative }, /* $90 */
195 { "sta", 2, flUseLabel, OH_DirectIndirectY }, /* $91 */
196 { "", 1, flIllegal, OH_Illegal, }, /* $92 */
197 { "", 1, flIllegal, OH_Illegal, }, /* $93 */
198 { "sty", 2, flUseLabel, OH_DirectX }, /* $94 */
199 { "sta", 2, flUseLabel, OH_DirectX }, /* $95 */
200 { "stx", 2, flUseLabel, OH_DirectY }, /* $96 */
201 { "", 1, flIllegal, OH_Illegal, }, /* $97 */
202 { "tya", 1, flNone, OH_Implicit }, /* $98 */
203 { "sta", 3, flUseLabel, OH_AbsoluteY }, /* $99 */
204 { "txs", 1, flNone, OH_Implicit }, /* $9a */
205 { "", 1, flIllegal, OH_Illegal, }, /* $9b */
206 { "", 1, flIllegal, OH_Illegal, }, /* $9c */
207 { "sta", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $9d */
208 { "", 1, flIllegal, OH_Illegal, }, /* $9e */
209 { "", 1, flIllegal, OH_Illegal, }, /* $9f */
210 { "ldy", 2, flNone, OH_Immediate }, /* $a0 */
211 { "lda", 2, flUseLabel, OH_DirectXIndirect }, /* $a1 */
212 { "ldx", 2, flNone, OH_Immediate }, /* $a2 */
213 { "", 1, flIllegal, OH_Illegal, }, /* $a3 */
214 { "ldy", 2, flUseLabel, OH_Direct }, /* $a4 */
215 { "lda", 2, flUseLabel, OH_Direct }, /* $a5 */
216 { "ldx", 2, flUseLabel, OH_Direct }, /* $a6 */
217 { "", 1, flIllegal, OH_Illegal, }, /* $a7 */
218 { "tay", 1, flNone, OH_Implicit }, /* $a8 */
219 { "lda", 2, flNone, OH_Immediate }, /* $a9 */
220 { "tax", 1, flNone, OH_Implicit }, /* $aa */
221 { "", 1, flIllegal, OH_Illegal, }, /* $ab */
222 { "ldy", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $ac */
223 { "lda", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $ad */
224 { "ldx", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $ae */
225 { "", 1, flIllegal, OH_Illegal, }, /* $af */
226 { "bcs", 2, flLabel, OH_Relative }, /* $b0 */
227 { "lda", 2, flUseLabel, OH_DirectIndirectY }, /* $b1 */
228 { "", 1, flIllegal, OH_Illegal, }, /* $b2 */
229 { "", 1, flIllegal, OH_Illegal, }, /* $b3 */
230 { "ldy", 2, flUseLabel, OH_DirectX }, /* $b4 */
231 { "lda", 2, flUseLabel, OH_DirectX }, /* $b5 */
232 { "ldx", 2, flUseLabel, OH_DirectY }, /* $b6 */
233 { "", 1, flIllegal, OH_Illegal, }, /* $b7 */
234 { "clv", 1, flNone, OH_Implicit }, /* $b8 */
235 { "lda", 3, flUseLabel, OH_AbsoluteY }, /* $b9 */
236 { "tsx", 1, flNone, OH_Implicit }, /* $ba */
237 { "", 1, flIllegal, OH_Illegal, }, /* $bb */
238 { "ldy", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $bc */
239 { "lda", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $bd */
240 { "ldx", 3, flUseLabel|flAbsOverride, OH_AbsoluteY }, /* $be */
241 { "", 1, flIllegal, OH_Illegal, }, /* $bf */
242 { "cpy", 2, flNone, OH_Immediate }, /* $c0 */
243 { "cmp", 2, flUseLabel, OH_DirectXIndirect }, /* $c1 */
244 { "", 1, flIllegal, OH_Illegal, }, /* $c2 */
245 { "", 1, flIllegal, OH_Illegal, }, /* $c3 */
246 { "cpy", 2, flUseLabel, OH_Direct }, /* $c4 */
247 { "cmp", 2, flUseLabel, OH_Direct }, /* $c5 */
248 { "dec", 2, flUseLabel, OH_Direct }, /* $c6 */
249 { "", 1, flIllegal, OH_Illegal, }, /* $c7 */
250 { "iny", 1, flNone, OH_Implicit }, /* $c8 */
251 { "cmp", 2, flNone, OH_Immediate }, /* $c9 */
252 { "dex", 1, flNone, OH_Implicit }, /* $ca */
253 { "", 1, flIllegal, OH_Illegal, }, /* $cb */
254 { "cpy", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $cc */
255 { "cmp", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $cd */
256 { "dec", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $ce */
257 { "", 1, flIllegal, OH_Illegal, }, /* $cf */
258 { "bne", 2, flLabel, OH_Relative }, /* $d0 */
259 { "cmp", 2, flUseLabel, OH_DirectIndirectY }, /* $d1 */
260 { "", 1, flIllegal, OH_Illegal, }, /* $d2 */
261 { "", 1, flIllegal, OH_Illegal, }, /* $d3 */
262 { "", 1, flIllegal, OH_Illegal, }, /* $d4 */
263 { "cmp", 2, flUseLabel, OH_DirectX }, /* $d5 */
264 { "dec", 2, flUseLabel, OH_DirectX }, /* $d6 */
265 { "", 1, flIllegal, OH_Illegal, }, /* $d7 */
266 { "cld", 1, flNone, OH_Implicit }, /* $d8 */
267 { "cmp", 3, flUseLabel, OH_AbsoluteY }, /* $d9 */
268 { "", 1, flIllegal, OH_Illegal, }, /* $da */
269 { "", 1, flIllegal, OH_Illegal, }, /* $db */
270 { "", 1, flIllegal, OH_Illegal, }, /* $dc */
271 { "cmp", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $dd */
272 { "dec", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $de */
273 { "", 1, flIllegal, OH_Illegal, }, /* $df */
274 { "cpx", 2, flNone, OH_Immediate }, /* $e0 */
275 { "sbc", 2, flUseLabel, OH_DirectXIndirect }, /* $e1 */
276 { "", 1, flIllegal, OH_Illegal, }, /* $e2 */
277 { "", 1, flIllegal, OH_Illegal, }, /* $e3 */
278 { "cpx", 2, flUseLabel, OH_Direct }, /* $e4 */
279 { "sbc", 2, flUseLabel, OH_Direct }, /* $e5 */
280 { "inc", 2, flUseLabel, OH_Direct }, /* $e6 */
281 { "", 1, flIllegal, OH_Illegal, }, /* $e7 */
282 { "inx", 1, flNone, OH_Implicit }, /* $e8 */
283 { "sbc", 2, flNone, OH_Immediate }, /* $e9 */
284 { "nop", 1, flNone, OH_Implicit }, /* $ea */
285 { "", 1, flIllegal, OH_Illegal, }, /* $eb */
286 { "cpx", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $ec */
287 { "sbc", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $ed */
288 { "inc", 3, flUseLabel|flAbsOverride, OH_Absolute }, /* $ee */
289 { "", 1, flIllegal, OH_Illegal, }, /* $ef */
290 { "beq", 2, flLabel, OH_Relative }, /* $f0 */
291 { "sbc", 2, flUseLabel, OH_DirectIndirectY }, /* $f1 */
292 { "", 1, flIllegal, OH_Illegal, }, /* $f2 */
293 { "", 1, flIllegal, OH_Illegal, }, /* $f3 */
294 { "", 1, flIllegal, OH_Illegal, }, /* $f4 */
295 { "sbc", 2, flUseLabel, OH_DirectX }, /* $f5 */
296 { "inc", 2, flUseLabel, OH_DirectX }, /* $f6 */
297 { "", 1, flIllegal, OH_Illegal, }, /* $f7 */
298 { "sed", 1, flNone, OH_Implicit }, /* $f8 */
299 { "sbc", 3, flUseLabel, OH_AbsoluteY }, /* $f9 */
300 { "", 1, flIllegal, OH_Illegal, }, /* $fa */
301 { "", 1, flIllegal, OH_Illegal, }, /* $fb */
302 { "", 1, flIllegal, OH_Illegal, }, /* $fc */
303 { "sbc", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $fd */
304 { "inc", 3, flUseLabel|flAbsOverride, OH_AbsoluteX }, /* $fe */
305 { "", 1, flIllegal, OH_Illegal, }, /* $ff */
306};
307