2018-11-16 00:35:52 +01:00
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/*****************************************************************************\
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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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2010-09-25 17:46:12 +02:00
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#ifndef _65C816_H_
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#define _65C816_H_
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#define Carry 1
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#define Zero 2
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#define IRQ 4
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#define Decimal 8
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#define IndexFlag 16
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#define MemoryFlag 32
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#define Overflow 64
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#define Negative 128
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#define Emulation 256
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#define SetCarry() (ICPU._Carry = 1)
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#define ClearCarry() (ICPU._Carry = 0)
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#define SetZero() (ICPU._Zero = 0)
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#define ClearZero() (ICPU._Zero = 1)
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#define SetIRQ() (Registers.PL |= IRQ)
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#define ClearIRQ() (Registers.PL &= ~IRQ)
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#define SetDecimal() (Registers.PL |= Decimal)
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#define ClearDecimal() (Registers.PL &= ~Decimal)
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#define SetIndex() (Registers.PL |= IndexFlag)
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#define ClearIndex() (Registers.PL &= ~IndexFlag)
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#define SetMemory() (Registers.PL |= MemoryFlag)
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#define ClearMemory() (Registers.PL &= ~MemoryFlag)
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#define SetOverflow() (ICPU._Overflow = 1)
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#define ClearOverflow() (ICPU._Overflow = 0)
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#define SetNegative() (ICPU._Negative = 0x80)
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#define ClearNegative() (ICPU._Negative = 0)
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#define CheckCarry() (ICPU._Carry)
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#define CheckZero() (ICPU._Zero == 0)
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#define CheckIRQ() (Registers.PL & IRQ)
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#define CheckDecimal() (Registers.PL & Decimal)
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#define CheckIndex() (Registers.PL & IndexFlag)
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#define CheckMemory() (Registers.PL & MemoryFlag)
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#define CheckOverflow() (ICPU._Overflow)
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#define CheckNegative() (ICPU._Negative & 0x80)
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#define CheckEmulation() (Registers.P.W & Emulation)
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#define SetFlags(f) (Registers.P.W |= (f))
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#define ClearFlags(f) (Registers.P.W &= ~(f))
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#define CheckFlag(f) (Registers.PL & (f))
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typedef union
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{
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#ifdef LSB_FIRST
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struct { uint8 l, h; } B;
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#else
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struct { uint8 h, l; } B;
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#endif
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uint16 W;
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} pair;
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typedef union
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{
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#ifdef LSB_FIRST
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struct { uint8 xPCl, xPCh, xPB, z; } B;
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struct { uint16 xPC, d; } W;
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#else
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struct { uint8 z, xPB, xPCh, xPCl; } B;
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struct { uint16 d, xPC; } W;
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#endif
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uint32 xPBPC;
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} PC_t;
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struct SRegisters
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{
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uint8 DB;
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pair P;
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pair A;
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pair D;
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pair S;
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pair X;
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pair Y;
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PC_t PC;
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};
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#define AL A.B.l
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#define AH A.B.h
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#define XL X.B.l
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#define XH X.B.h
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#define YL Y.B.l
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#define YH Y.B.h
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#define SL S.B.l
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#define SH S.B.h
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#define DL D.B.l
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#define DH D.B.h
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#define PL P.B.l
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#define PH P.B.h
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#define PBPC PC.xPBPC
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#define PCw PC.W.xPC
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#define PCh PC.B.xPCh
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#define PCl PC.B.xPCl
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#define PB PC.B.xPB
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extern struct SRegisters Registers;
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#endif
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