frodo-wii/Src/CPU_common.cpp

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2009-01-13 19:46:42 +01:00
/*
* CPU_common.cpp - Definitions common to 6502/6510 SC emulation
*
* Frodo (C) 1994-1997,2002-2005 Christian Bauer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "sysdeps.h"
#include "CPU_common.h"
// Addressing mode for each opcode (first part of execution) (Frodo SC)
const uint8 ModeTab[256] = {
O_BRK, A_INDX, 1, M_INDX, A_ZERO, A_ZERO, M_ZERO, M_ZERO, // 00
O_PHP, O_ORA_I,O_ASL_A,O_ANC_I,A_ABS, A_ABS, M_ABS, M_ABS,
O_BPL, AE_INDY,1, M_INDY, A_ZEROX,A_ZEROX,M_ZEROX,M_ZEROX,// 10
O_CLC, AE_ABSY,O_NOP, M_ABSY, AE_ABSX,AE_ABSX,M_ABSX, M_ABSX,
O_JSR, A_INDX, 1, M_INDX, A_ZERO, A_ZERO, M_ZERO, M_ZERO, // 20
O_PLP, O_AND_I,O_ROL_A,O_ANC_I,A_ABS, A_ABS, M_ABS, M_ABS,
O_BMI, AE_INDY,1, M_INDY, A_ZEROX,A_ZEROX,M_ZEROX,M_ZEROX,// 30
O_SEC, AE_ABSY,O_NOP, M_ABSY, AE_ABSX,AE_ABSX,M_ABSX, M_ABSX,
O_RTI, A_INDX, 1, M_INDX, A_ZERO, A_ZERO, M_ZERO, M_ZERO, // 40
O_PHA, O_EOR_I,O_LSR_A,O_ASR_I,O_JMP, A_ABS, M_ABS, M_ABS,
O_BVC, AE_INDY,1, M_INDY, A_ZEROX,A_ZEROX,M_ZEROX,M_ZEROX,// 50
O_CLI, AE_ABSY,O_NOP, M_ABSY, AE_ABSX,AE_ABSX,M_ABSX, M_ABSX,
O_RTS, A_INDX, 1, M_INDX, A_ZERO, A_ZERO, M_ZERO, M_ZERO, // 60
O_PLA, O_ADC_I,O_ROR_A,O_ARR_I,A_ABS, A_ABS, M_ABS, M_ABS,
O_BVS, AE_INDY,1, M_INDY, A_ZEROX,A_ZEROX,M_ZEROX,M_ZEROX,// 70
O_SEI, AE_ABSY,O_NOP, M_ABSY, AE_ABSX,AE_ABSX,M_ABSX, M_ABSX,
O_NOP_I,A_INDX, O_NOP_I,A_INDX, A_ZERO, A_ZERO, A_ZERO, A_ZERO, // 80
O_DEY, O_NOP_I,O_TXA, O_ANE_I,A_ABS, A_ABS, A_ABS, A_ABS,
O_BCC, A_INDY, 1, A_INDY, A_ZEROX,A_ZEROX,A_ZEROY,A_ZEROY,// 90
O_TYA, A_ABSY, O_TXS, A_ABSY, A_ABSX, A_ABSX, A_ABSY, A_ABSY,
O_LDY_I,A_INDX, O_LDX_I,A_INDX, A_ZERO, A_ZERO, A_ZERO, A_ZERO, // a0
O_TAY, O_LDA_I,O_TAX, O_LXA_I,A_ABS, A_ABS, A_ABS, A_ABS,
O_BCS, AE_INDY,1, AE_INDY,A_ZEROX,A_ZEROX,A_ZEROY,A_ZEROY,// b0
O_CLV, AE_ABSY,O_TSX, AE_ABSY,AE_ABSX,AE_ABSX,AE_ABSY,AE_ABSY,
O_CPY_I,A_INDX, O_NOP_I,M_INDX, A_ZERO, A_ZERO, M_ZERO, M_ZERO, // c0
O_INY, O_CMP_I,O_DEX, O_SBX_I,A_ABS, A_ABS, M_ABS, M_ABS,
O_BNE, AE_INDY,1, M_INDY, A_ZEROX,A_ZEROX,M_ZEROX,M_ZEROX,// d0
O_CLD, AE_ABSY,O_NOP, M_ABSY, AE_ABSX,AE_ABSX,M_ABSX, M_ABSX,
O_CPX_I,A_INDX, O_NOP_I,M_INDX, A_ZERO, A_ZERO, M_ZERO, M_ZERO, // e0
O_INX, O_SBC_I,O_NOP, O_SBC_I,A_ABS, A_ABS, M_ABS, M_ABS,
O_BEQ, AE_INDY,O_EXT, M_INDY, A_ZEROX,A_ZEROX,M_ZEROX,M_ZEROX,// f0
O_SED, AE_ABSY,O_NOP, M_ABSY, AE_ABSX,AE_ABSX,M_ABSX, M_ABSX
};
// Operation for each opcode (second part of execution) (Frodo SC)
const uint8 OpTab[256] = {
1, O_ORA, 1, O_SLO, O_NOP_A,O_ORA, O_ASL, O_SLO, // 00
1, 1, 1, 1, O_NOP_A,O_ORA, O_ASL, O_SLO,
1, O_ORA, 1, O_SLO, O_NOP_A,O_ORA, O_ASL, O_SLO, // 10
1, O_ORA, 1, O_SLO, O_NOP_A,O_ORA, O_ASL, O_SLO,
1, O_AND, 1, O_RLA, O_BIT, O_AND, O_ROL, O_RLA, // 20
1, 1, 1, 1, O_BIT, O_AND, O_ROL, O_RLA,
1, O_AND, 1, O_RLA, O_NOP_A,O_AND, O_ROL, O_RLA, // 30
1, O_AND, 1, O_RLA, O_NOP_A,O_AND, O_ROL, O_RLA,
1, O_EOR, 1, O_SRE, O_NOP_A,O_EOR, O_LSR, O_SRE, // 40
1, 1, 1, 1, 1, O_EOR, O_LSR, O_SRE,
1, O_EOR, 1, O_SRE, O_NOP_A,O_EOR, O_LSR, O_SRE, // 50
1, O_EOR, 1, O_SRE, O_NOP_A,O_EOR, O_LSR, O_SRE,
1, O_ADC, 1, O_RRA, O_NOP_A,O_ADC, O_ROR, O_RRA, // 60
1, 1, 1, 1, O_JMP_I,O_ADC, O_ROR, O_RRA,
1, O_ADC, 1, O_RRA, O_NOP_A,O_ADC, O_ROR, O_RRA, // 70
1, O_ADC, 1, O_RRA, O_NOP_A,O_ADC, O_ROR, O_RRA,
1, O_STA, 1, O_SAX, O_STY, O_STA, O_STX, O_SAX, // 80
1, 1, 1, 1, O_STY, O_STA, O_STX, O_SAX,
1, O_STA, 1, O_SHA, O_STY, O_STA, O_STX, O_SAX, // 90
1, O_STA, 1, O_SHS, O_SHY, O_STA, O_SHX, O_SHA,
1, O_LDA, 1, O_LAX, O_LDY, O_LDA, O_LDX, O_LAX, // a0
1, 1, 1, 1, O_LDY, O_LDA, O_LDX, O_LAX,
1, O_LDA, 1, O_LAX, O_LDY, O_LDA, O_LDX, O_LAX, // b0
1, O_LDA, 1, O_LAS, O_LDY, O_LDA, O_LDX, O_LAX,
1, O_CMP, 1, O_DCP, O_CPY, O_CMP, O_DEC, O_DCP, // c0
1, 1, 1, 1, O_CPY, O_CMP, O_DEC, O_DCP,
1, O_CMP, 1, O_DCP, O_NOP_A,O_CMP, O_DEC, O_DCP, // d0
1, O_CMP, 1, O_DCP, O_NOP_A,O_CMP, O_DEC, O_DCP,
1, O_SBC, 1, O_ISB, O_CPX, O_SBC, O_INC, O_ISB, // e0
1, 1, 1, 1, O_CPX, O_SBC, O_INC, O_ISB,
1, O_SBC, 1, O_ISB, O_NOP_A,O_SBC, O_INC, O_ISB, // f0
1, O_SBC, 1, O_ISB, O_NOP_A,O_SBC, O_INC, O_ISB
};