1 /*****************************************************************************/
5 /* Opcode and addressing mode definitions */
9 /* (C) 2001 Ullrich von Bassewitz */
11 /* D-70597 Stuttgart */
12 /* EMail: uz@musoftware.de */
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. */
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: */
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 */
32 /*****************************************************************************/
49 /*****************************************************************************/
51 /*****************************************************************************/
55 /* Mapper table, mnemonic --> opcode */
56 static const OPCDesc OPCTable[OPC_COUNT] = {
57 { "adc", OPC_ADC, 0, CI_USE_A | CI_CHG_A },
58 { "and", OPC_AND, 0, CI_USE_A | CI_CHG_A },
59 { "asl", OPC_ASL, 0, CI_USE_A | CI_CHG_A },
60 { "bcc", OPC_BCC, 2, CI_BRA },
61 { "bcs", OPC_BCS, 2, CI_BRA },
62 { "beq", OPC_BEQ, 2, CI_BRA },
63 { "bit", OPC_BIT, 0, CI_USE_A },
64 { "bmi", OPC_BMI, 2, CI_BRA },
65 { "bne", OPC_BNE, 2, CI_BRA },
66 { "bpl", OPC_BPL, 2, CI_BRA },
67 { "bra", OPC_BRA, 2, CI_BRA },
68 { "brk", OPC_BRK, 1, CI_NONE },
69 { "bvc", OPC_BVC, 2, CI_BRA },
70 { "bvs", OPC_BVS, 2, CI_BRA },
71 { "clc", OPC_CLC, 1, CI_CHG_NONE },
72 { "cld", OPC_CLD, 1, CI_CHG_NONE },
73 { "cli", OPC_CLI, 1, CI_CHG_NONE },
74 { "clv", OPC_CLV, 1, CI_CHG_NONE },
75 { "cmp", OPC_CMP, 0, CI_USE_A },
76 { "cpx", OPC_CPX, 0, CI_USE_X },
77 { "cpy", OPC_CPY, 0, CI_USE_Y },
78 { "dea", OPC_DEA, 1, CI_USE_A | CI_CHG_A },
79 { "dec", OPC_DEC, 0, CI_NONE },
80 { "dex", OPC_DEX, 1, CI_USE_X | CI_CHG_X },
81 { "dey", OPC_DEY, 1, CI_USE_Y | CI_CHG_Y },
82 { "eor", OPC_EOR, 0, CI_USE_A | CI_CHG_A },
83 { "ina", OPC_INA, 1, CI_USE_A | CI_CHG_A },
84 { "inc", OPC_INC, 0, CI_NONE },
85 { "inx", OPC_INX, 1, CI_USE_X | CI_CHG_X },
86 { "iny", OPC_INY, 1, CI_USE_Y | CI_CHG_Y },
87 { "jcc", OPC_JCC, 5, CI_BRA },
88 { "jcs", OPC_JCS, 5, CI_BRA },
89 { "jeq", OPC_JEQ, 5, CI_BRA },
90 { "jmi", OPC_JMI, 5, CI_BRA },
91 { "jmp", OPC_JMP, 3, CI_BRA },
92 { "jne", OPC_JNE, 5, CI_BRA },
93 { "jpl", OPC_JPL, 5, CI_BRA },
94 { "jsr", OPC_JSR, 3, CI_BRA },
95 { "jvc", OPC_JVC, 5, CI_BRA },
96 { "jvs", OPC_JVS, 5, CI_BRA },
97 { "lda", OPC_LDA, 0, CI_CHG_A },
98 { "ldx", OPC_LDX, 0, CI_CHG_X },
99 { "ldy", OPC_LDY, 0, CI_CHG_Y },
100 { "lsr", OPC_LSR, 0, CI_USE_A | CI_CHG_A },
101 { "nop", OPC_NOP, 1, CI_NONE },
102 { "ora", OPC_ORA, 0, CI_USE_A | CI_CHG_A },
103 { "pha", OPC_PHA, 1, CI_USE_A },
104 { "php", OPC_PHP, 1, CI_NONE },
105 { "phx", OPC_PHX, 1, CI_USE_X },
106 { "phy", OPC_PHY, 1, CI_USE_Y },
107 { "pla", OPC_PLA, 1, CI_CHG_A },
108 { "plp", OPC_PLP, 1, CI_NONE },
109 { "plx", OPC_PLX, 1, CI_CHG_X },
110 { "ply", OPC_PLY, 1, CI_CHG_Y },
111 { "rol", OPC_ROL, 0, CI_USE_A | CI_CHG_A },
112 { "ror", OPC_ROR, 0, CI_USE_A | CI_CHG_A },
113 { "rti", OPC_RTI, 1, CI_NONE },
114 { "rts", OPC_RTS, 1, CI_NONE },
115 { "sbc", OPC_SBC, 0, CI_USE_A | CI_CHG_A },
116 { "sec", OPC_SEC, 1, CI_NONE },
117 { "sed", OPC_SED, 1, CI_NONE },
118 { "sei", OPC_SEI, 1, CI_NONE },
119 { "sta", OPC_STA, 0, CI_USE_A },
120 { "stx", OPC_STX, 0, CI_USE_X },
121 { "sty", OPC_STY, 0, CI_USE_Y },
122 { "tax", OPC_TAX, 1, CI_USE_A | CI_CHG_X },
123 { "tay", OPC_TAY, 1, CI_USE_A | CI_CHG_Y },
124 { "trb", OPC_TRB, 0, CI_USE_A },
125 { "tsb", OPC_TSB, 0, CI_USE_A },
126 { "tsx", OPC_TSX, 1, CI_CHG_X },
127 { "txa", OPC_TXA, 1, CI_USE_X | CI_CHG_A },
128 { "txs", OPC_TXS, 1, CI_USE_X },
129 { "tya", OPC_TYA, 1, CI_USE_Y | CI_CHG_A }
134 /*****************************************************************************/
136 /*****************************************************************************/
140 static int Compare (const void* Key, const void* Desc)
141 /* Compare function for bsearch */
143 return strcmp (Key, ((OPCDesc*)Desc)->Mnemo);
148 const OPCDesc* FindOpcode (const char* M)
149 /* Find the given opcode and return the opcode number. If the opcode was not
150 * found, return OPC_INVALID.
156 /* Check the length of the given string, then copy it into local
157 * storage, converting it to upper case.
159 char Mnemo[sizeof (OPCTable[0].Mnemo)];
161 if (Len >= sizeof (OPCTable[0].Mnemo)) {
162 /* Invalid length means invalid opcode */
165 for (I = 0; I < Len; ++I) {
166 Mnemo[I] = tolower (M[I]);
170 /* Search for the mnemonic in the table and return the result */
171 return bsearch (Mnemo, OPCTable, OPC_COUNT, sizeof (OPCTable[0]), Compare);
176 unsigned GetInsnSize (opc_t OPC, am_t AM)
177 /* Return the size of the given instruction */
179 /* Get the opcode desc and check the size given there */
180 const OPCDesc* D = &OPCTable[OPC];
185 /* Check the addressing mode. */
187 case AM_IMP: return 1;
188 case AM_ACC: return 1;
189 case AM_IMM: return 2;
190 case AM_ZP: return 2;
191 case AM_ZPX: return 2;
192 case AM_ABS: return 3;
193 case AM_ABSX: return 3;
194 case AM_ABSY: return 3;
195 case AM_ZPX_IND: return 2;
196 case AM_ZP_INDY: return 2;
197 case AM_ZP_IND: return 2;
198 default: FAIL ("Invalid addressing mode");
204 const OPCDesc* GetOPCDesc (opc_t OPC)
205 /* Get an opcode description */
207 /* Check the range */
208 PRECONDITION (OPC >= (opc_t)0 && OPC < OPC_COUNT);
210 /* Return the description */
211 return &OPCTable [OPC];