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https://github.com/libretro/snes9x.git
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103 lines
2.3 KiB
C
103 lines
2.3 KiB
C
/*****************************************************************************\
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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This file is licensed under the Snes9x License.
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For further information, consult the LICENSE file in the root directory.
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\*****************************************************************************/
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#ifndef _CPUEXEC_H_
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#define _CPUEXEC_H_
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#include "ppu.h"
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#ifdef DEBUGGER
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#include "debug.h"
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#endif
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struct SOpcodes
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{
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void (*S9xOpcode) (void);
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};
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struct SICPU
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{
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struct SOpcodes *S9xOpcodes;
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uint8 *S9xOpLengths;
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uint8 _Carry;
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uint8 _Zero;
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uint8 _Negative;
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uint8 _Overflow;
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uint32 ShiftedPB;
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uint32 ShiftedDB;
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uint32 Frame;
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uint32 FrameAdvanceCount;
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};
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extern struct SICPU ICPU;
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extern struct SOpcodes S9xOpcodesE1[256];
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extern struct SOpcodes S9xOpcodesM1X1[256];
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extern struct SOpcodes S9xOpcodesM1X0[256];
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extern struct SOpcodes S9xOpcodesM0X1[256];
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extern struct SOpcodes S9xOpcodesM0X0[256];
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extern struct SOpcodes S9xOpcodesSlow[256];
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extern uint8 S9xOpLengthsM1X1[256];
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extern uint8 S9xOpLengthsM1X0[256];
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extern uint8 S9xOpLengthsM0X1[256];
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extern uint8 S9xOpLengthsM0X0[256];
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void S9xMainLoop (void);
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void S9xReset (void);
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void S9xSoftReset (void);
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void S9xDoHEventProcessing (void);
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static inline void S9xUnpackStatus (void)
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{
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ICPU._Zero = (Registers.PL & Zero) == 0;
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ICPU._Negative = (Registers.PL & Negative);
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ICPU._Carry = (Registers.PL & Carry);
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ICPU._Overflow = (Registers.PL & Overflow) >> 6;
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}
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static inline void S9xPackStatus (void)
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{
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Registers.PL &= ~(Zero | Negative | Carry | Overflow);
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Registers.PL |= ICPU._Carry | ((ICPU._Zero == 0) << 1) | (ICPU._Negative & 0x80) | (ICPU._Overflow << 6);
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}
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static inline void S9xFixCycles (void)
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{
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if (CheckEmulation())
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{
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ICPU.S9xOpcodes = S9xOpcodesE1;
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ICPU.S9xOpLengths = S9xOpLengthsM1X1;
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}
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else
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if (CheckMemory())
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{
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if (CheckIndex())
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{
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ICPU.S9xOpcodes = S9xOpcodesM1X1;
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ICPU.S9xOpLengths = S9xOpLengthsM1X1;
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}
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else
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{
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ICPU.S9xOpcodes = S9xOpcodesM1X0;
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ICPU.S9xOpLengths = S9xOpLengthsM1X0;
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}
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}
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else
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{
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if (CheckIndex())
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{
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ICPU.S9xOpcodes = S9xOpcodesM0X1;
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ICPU.S9xOpLengths = S9xOpLengthsM0X1;
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}
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else
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{
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ICPU.S9xOpcodes = S9xOpcodesM0X0;
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ICPU.S9xOpLengths = S9xOpLengthsM0X0;
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}
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}
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}
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#endif
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