CPU_common.h

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/*
 *  CPU_common.h - Definitions common to 6502/6510 SC emulation
 *
 *  Frodo (C) 1994-1997 Christian Bauer
 */

#ifndef _CPU_COMMON_H_
#define _CPU_COMMON_H_


// States for addressing modes/operations (Frodo SC)
enum {
        // Read effective address, no extra cycles
        A_ZERO=0x18,
        A_ZEROX, A_ZEROX1,
        A_ZEROY, A_ZEROY1,
        A_ABS, A_ABS1,
        A_ABSX, A_ABSX1, A_ABSX2, A_ABSX3,
        A_ABSY, A_ABSY1, A_ABSY2, A_ABSY3,
        A_INDX, A_INDX1, A_INDX2, A_INDX3,
        A_INDY, A_INDY1, A_INDY2, A_INDY3, A_INDY4,

        // Read effective address, extra cycle on page crossing
        AE_ABSX, AE_ABSX1, AE_ABSX2,
        AE_ABSY, AE_ABSY1, AE_ABSY2,
        AE_INDY, AE_INDY1, AE_INDY2, AE_INDY3,

        // Read operand and write it back (for RMW instructions), no extra cycles
        M_ZERO,
        M_ZEROX, M_ZEROX1,
        M_ZEROY, M_ZEROY1,
        M_ABS, M_ABS1,
        M_ABSX, M_ABSX1, M_ABSX2, M_ABSX3,
        M_ABSY, M_ABSY1, M_ABSY2, M_ABSY3,
        M_INDX, M_INDX1, M_INDX2, M_INDX3,
        M_INDY, M_INDY1, M_INDY2, M_INDY3, M_INDY4,
        RMW_DO_IT, RMW_DO_IT1,

        // Operations (_I = Immediate/Indirect, _A = Accumulator)
        O_LDA, O_LDA_I, O_LDX, O_LDX_I, O_LDY, O_LDY_I,
        O_STA, O_STX, O_STY,
        O_TAX, O_TXA, O_TAY, O_TYA, O_TSX, O_TXS,
        O_ADC, O_ADC_I, O_SBC, O_SBC_I,
        O_INX, O_DEX, O_INY, O_DEY, O_INC, O_DEC,
        O_AND, O_AND_I, O_ORA, O_ORA_I, O_EOR, O_EOR_I,
        O_CMP, O_CMP_I, O_CPX, O_CPX_I, O_CPY, O_CPY_I,
        O_BIT,
        O_ASL, O_ASL_A, O_LSR, O_LSR_A, O_ROL, O_ROL_A, O_ROR, O_ROR_A,
        O_PHA, O_PHA1, O_PLA, O_PLA1, O_PLA2,
        O_PHP, O_PHP1, O_PLP, O_PLP1, O_PLP2,
        O_JMP, O_JMP1, O_JMP_I, O_JMP_I1,
        O_JSR, O_JSR1, O_JSR2, O_JSR3, O_JSR4,
        O_RTS, O_RTS1, O_RTS2, O_RTS3, O_RTS4,
        O_RTI, O_RTI1, O_RTI2, O_RTI3, O_RTI4,
        O_BRK, O_BRK1, O_BRK2, O_BRK3, O_BRK4, O_BRK5, O_BRK5NMI,
        O_BCS, O_BCC, O_BEQ, O_BNE, O_BVS, O_BVC, O_BMI, O_BPL,
        O_BRANCH_NP, O_BRANCH_BP, O_BRANCH_BP1, O_BRANCH_FP, O_BRANCH_FP1,
        O_SEC, O_CLC, O_SED, O_CLD, O_SEI, O_CLI, O_CLV,
        O_NOP,

        O_NOP_I, O_NOP_A,
        O_LAX, O_SAX,
        O_SLO, O_RLA, O_SRE, O_RRA, O_DCP, O_ISB,
        O_ANC_I, O_ASR_I, O_ARR_I, O_ANE_I, O_LXA_I, O_SBX_I,
        O_LAS, O_SHS, O_SHY, O_SHX, O_SHA,
        O_EXT
};


// Addressing mode for each opcode (first part of execution) (Frodo SC)
extern const uint8 ModeTab[256];

// Operation for each opcode (second part of execution) (Frodo SC)
extern const uint8 OpTab[256];

#endif

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