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65c816.h
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65c816.h
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/*
* Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
*
* (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
* Jerremy Koot (jkoot@snes9x.com)
*
* Super FX C emulator code
* (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and
* Gary Henderson.
* Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
*
* DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
* C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
* C4 C code (c) Copyright 2001 Gary Henderson (gary.henderson@ntlworld.com).
*
* DOS port code contains the works of other authors. See headers in
* individual files.
*
* Snes9x homepage: http://www.snes9x.com
*
* Permission to use, copy, modify and distribute Snes9x in both binary and
* source form, for non-commercial purposes, is hereby granted without fee,
* providing that this license information and copyright notice appear with
* all copies and any derived work.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event shall the authors be held liable for any damages
* arising from the use of this software.
*
* Snes9x is freeware for PERSONAL USE only. Commercial users should
* seek permission of the copyright holders first. Commercial use includes
* charging money for Snes9x or software derived from Snes9x.
*
* The copyright holders request that bug fixes and improvements to the code
* should be forwarded to them so everyone can benefit from the modifications
* in future versions.
*
* Super NES and Super Nintendo Entertainment System are trademarks of
* Nintendo Co., Limited and its subsidiary companies.
*/
#ifndef _65c816_h_
#define _65c816_h_
#define AL A.B.l
#define AH A.B.h
#define XL X.B.l
#define XH X.B.h
#define YL Y.B.l
#define YH Y.B.h
#define SL S.B.l
#define SH S.B.h
#define DL D.B.l
#define DH D.B.h
#define PL P.B.l
#define PH P.B.h
#define Carry 1
#define Zero 2
#define IRQ 4
#define Decimal 8
#define IndexFlag 16
#define MemoryFlag 32
#define Overflow 64
#define Negative 128
#define Emulation 256
#define CLEARCARRY() (icpu->_Carry = 0)
#define SETCARRY() (icpu->_Carry = 1)
#define SETZERO() (icpu->_Zero = 0)
#define CLEARZERO() (icpu->_Zero = 1)
#define SETIRQ_OP() (reg->P.W |= IRQ)
#define SETIRQ() (Registers.P.W |= IRQ)
#define CLEARIRQ() (reg->P.W &= ~IRQ)
#define SETDECIMAL() (reg->P.W |= Decimal)
#define CLEARDECIMAL() (Registers.P.W &= ~Decimal)
#define CLEARDECIMAL_OP() (reg->P.W &= ~Decimal)
#define SETINDEX() ( (reg->P.W |= IndexFlag)
#define CLEARINDEX() (reg->P.W &= ~IndexFlag)
#define SETMEMORY() (reg->P.W |= MemoryFlag)
#define CLEARMEMORY() (reg->P.W &= ~MemoryFlag)
#define SETOVERFLOW() (icpu->_Overflow = 1)
#define CLEAROVERFLOW() (icpu->_Overflow = 0)
#define SETNEGATIVE() (icpu->_Negative = 0x80)
#define CLEARNEGATIVE() (icpu->_Negative = 0)
#define CHECKZERO() (icpu->_Zero == 0)
#define CHECKCARRY() (icpu->_Carry)
#define CHECKIRQ() (reg->P.W & IRQ)
#define CHECKDECIMAL() (reg->P.W & Decimal)
#define CHECKINDEX() (reg->P.W & IndexFlag)
#define CHECKMEMORY() (reg->P.W & MemoryFlag)
#define CHECKOVERFLOW() (icpu->_Overflow)
#define CHECKNEGATIVE() (icpu->_Negative & 0x80)
#define CHECKEMULATION() (Registers.P.W & Emulation)
#define CHECKEMULATION_OP() (reg->P.W & Emulation)
#define CLEARFLAGS(f) (Registers.P.W &= ~(f))
#define SETFLAGS(f) (Registers.P.W |= (f))
#define SETFLAGS_OP(f) (reg->P.W |= (f))
#define CHECKFLAG(f) (reg->PL & (f))
typedef union
{
#ifdef LSB_FIRST
struct { uint8 l,h; } B;
#else
struct { uint8 h,l; } B;
#endif
uint16 W;
} pair;
struct SRegisters{
uint16_32 PC;
uint8_32 PB;
uint8_32 DB;
pair P;
pair A;
pair D;
pair S;
pair X;
pair Y;
};
/*
struct SRegisters{
uint8 PB;
uint8 DB;
pair P;
pair A;
pair D;
pair S;
pair X;
pair Y;
uint16 PC;
};
*/
struct SICPU
{
uint8 *Speed;
struct SOpcodes *S9xOpcodes;
uint8_32 _Carry;
uint8_32 _Zero;
uint8_32 _Negative;
uint8_32 _Overflow;
bool8_32 CPUExecuting;
uint32 ShiftedPB;
uint32 ShiftedDB;
uint32 Frame;
uint32 Scanline;
uint32 FrameAdvanceCount;
};
EXTERN_C struct SRegisters Registers;
#endif