snes9xgx/source/snes9x/cpuaddr.h

/**********************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.

  (c) Copyright 1996 - 2002  Gary Henderson (gary.henderson@ntlworld.com) and
                             Jerremy Koot (jkoot@snes9x.com)

  (c) Copyright 2002 - 2004  Matthew Kendora

  (c) Copyright 2002 - 2005  Peter Bortas (peter@bortas.org)

  (c) Copyright 2004 - 2005  Joel Yliluoma (http://iki.fi/bisqwit/)

  (c) Copyright 2001 - 2006  John Weidman (jweidman@slip.net)

  (c) Copyright 2002 - 2006  Brad Jorsch (anomie@users.sourceforge.net),
                             funkyass (funkyass@spam.shaw.ca),
                             Kris Bleakley (codeviolation@hotmail.com),
                             Nach (n-a-c-h@users.sourceforge.net), and
                             zones (kasumitokoduck@yahoo.com)

  BS-X C emulator code
  (c) Copyright 2005 - 2006  Dreamer Nom,
                             zones

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003  _Demo_ (_demo_@zsnes.com),
                             Nach,
                             zsKnight (zsknight@zsnes.com)

  C4 C++ code
  (c) Copyright 2003 - 2006  Brad Jorsch,
                             Nach

  DSP-1 emulator code
  (c) Copyright 1998 - 2006  _Demo_,
                             Andreas Naive (andreasnaive@gmail.com)
                             Gary Henderson,
                             Ivar (ivar@snes9x.com),
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora,
                             Nach,
                             neviksti (neviksti@hotmail.com)

  DSP-2 emulator code
  (c) Copyright 2003         John Weidman,
                             Kris Bleakley,
                             Lord Nightmare (lord_nightmare@users.sourceforge.net),
                             Matthew Kendora,
                             neviksti


  DSP-3 emulator code
  (c) Copyright 2003 - 2006  John Weidman,
                             Kris Bleakley,
                             Lancer,
                             z80 gaiden

  DSP-4 emulator code
  (c) Copyright 2004 - 2006  Dreamer Nom,
                             John Weidman,
                             Kris Bleakley,
                             Nach,
                             z80 gaiden

  OBC1 emulator code
  (c) Copyright 2001 - 2004  zsKnight,
                             pagefault (pagefault@zsnes.com),
                             Kris Bleakley,
                             Ported from x86 assembler to C by sanmaiwashi

  SPC7110 and RTC C++ emulator code
  (c) Copyright 2002         Matthew Kendora with research by
                             zsKnight,
                             John Weidman,
                             Dark Force

  S-DD1 C emulator code
  (c) Copyright 2003         Brad Jorsch with research by
                             Andreas Naive,
                             John Weidman

  S-RTC C emulator code
  (c) Copyright 2001-2006    byuu,
                             John Weidman

  ST010 C++ emulator code
  (c) Copyright 2003         Feather,
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora

  Super FX x86 assembler emulator code
  (c) Copyright 1998 - 2003  _Demo_,
                             pagefault,
                             zsKnight,

  Super FX C emulator code
  (c) Copyright 1997 - 1999  Ivar,
                             Gary Henderson,
                             John Weidman

  Sound DSP emulator code is derived from SNEeSe and OpenSPC:
  (c) Copyright 1998 - 2003  Brad Martin
  (c) Copyright 1998 - 2006  Charles Bilyue'

  SH assembler code partly based on x86 assembler code
  (c) Copyright 2002 - 2004  Marcus Comstedt (marcus@mc.pp.se)

  2xSaI filter
  (c) Copyright 1999 - 2001  Derek Liauw Kie Fa

  HQ2x filter
  (c) Copyright 2003         Maxim Stepin (maxim@hiend3d.com)

  Specific ports contains the works of other authors. See headers in
  individual files.

  Snes9x homepage: http://www.snes9x.com

  Permission to use, copy, modify and/or 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 or it's derivatives.

  Snes9x is freeware for PERSONAL USE only. Commercial users should
  seek permission of the copyright holders first. Commercial use includes,
  but is not limited to, charging money for Snes9x or software derived from
  Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
  using Snes9x as a promotion for your commercial product.

  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 _CPUADDR_H_
#define _CPUADDR_H_

typedef enum {
    NONE = 0,
    READ = 1,
    WRITE = 2,
    MODIFY = 3,
    JUMP = 5,
    JSR = 8
} AccessMode;

STATIC inline uint8 Immediate8 (AccessMode a) {
    uint8 val = CPU.PCBase[Registers.PCw];
    if(a&READ) OpenBus = val;
    AddCycles(CPU.MemSpeed);
    Registers.PCw++;
    return val;
}

STATIC inline uint8 Immediate8Slow (AccessMode a) {
    uint8 val = S9xGetByte(Registers.PBPC);
    if(a&READ) OpenBus = val;
    Registers.PCw++;
    return val;
}

STATIC inline uint16 Immediate16 (AccessMode a) {
    uint16 val = READ_WORD(CPU.PCBase+Registers.PCw);
    if(a&READ) OpenBus = (uint8)(val>>8);
    AddCycles(CPU.MemSpeedx2);
    Registers.PCw+=2;
    return val;
}

STATIC inline uint16 Immediate16Slow (AccessMode a) {
    uint16 val = S9xGetWord(Registers.PBPC, WRAP_BANK);
    if(a&READ) OpenBus = (uint8)(val>>8);
    Registers.PCw+=2;
    return val;
}


STATIC inline uint32 RelativeSlow (AccessMode a) {  // branch $xx
    int8 offset = Immediate8Slow(a);
    return ((int16)Registers.PCw + offset) & 0xffff;
}

STATIC inline uint32 Relative (AccessMode a) {  // branch $xx
    int8 offset = Immediate8(a);
    return ((int16)Registers.PCw + offset) & 0xffff;
}

STATIC inline uint32 RelativeLongSlow (AccessMode a) {  // BRL $xxxx
    int16 offset = Immediate16Slow(a);
    return ((int32)Registers.PCw + offset) & 0xffff;
}

STATIC inline uint32 RelativeLong (AccessMode a) {  // BRL $xxxx
    int16 offset = Immediate16(a);
    return ((int32)Registers.PCw + offset) & 0xffff;
}

STATIC inline uint32 AbsoluteIndexedIndirectSlow (AccessMode a) { // (a,X)
    uint16 addr;
    if(a&JSR){
        // JSR (a,X) pushes the old address in the middle of loading the new.
        // OpenBus needs to be set to account for this.
        addr = Immediate8Slow(READ);
        if(a==JSR) OpenBus = Registers.PCl;
        addr |= Immediate8Slow(READ)<<8;
    } else {
        addr = Immediate16Slow(READ);
    }
    AddCycles(ONE_CYCLE);
    addr+=Registers.X.W;

    // Address load wraps within the bank
    uint16 addr2 = S9xGetWord(ICPU.ShiftedPB | addr, WRAP_BANK);
    OpenBus = addr2>>8;
    return addr2;
}

STATIC inline uint32 AbsoluteIndexedIndirect (AccessMode a) { // (a,X)
    uint16 addr = Immediate16Slow(READ);
    addr+=Registers.X.W;

    // Address load wraps within the bank
    uint16 addr2 = S9xGetWord(ICPU.ShiftedPB | addr, WRAP_BANK);
    OpenBus = addr2>>8;
    return addr2;
}

STATIC inline uint32 AbsoluteIndirectLongSlow (AccessMode a) { // [a]
    uint16 addr = Immediate16Slow(READ);

    // No info on wrapping, but it doesn't matter anyway due to mirroring
    uint32 addr2 = S9xGetWord(addr);
    OpenBus=addr2>>8;
    addr2 |= (OpenBus = S9xGetByte(addr+2))<<16;
    return addr2;
}

STATIC inline uint32 AbsoluteIndirectLong (AccessMode a) {  // [a]
    uint16 addr = Immediate16(READ);

    // No info on wrapping, but it doesn't matter anyway due to mirroring
    uint32 addr2 = S9xGetWord(addr);
    OpenBus=addr2>>8;
    addr2 |= (OpenBus = S9xGetByte(addr+2))<<16;
    return addr2;
}

STATIC inline uint32 AbsoluteIndirectSlow (AccessMode a) {  // (a)
    // No info on wrapping, but it doesn't matter anyway due to mirroring
    uint16 addr2 = S9xGetWord(Immediate16Slow(READ));
    OpenBus=addr2>>8;
    return addr2;
}

STATIC inline uint32 AbsoluteIndirect (AccessMode a) {  // (a)
    // No info on wrapping, but it doesn't matter anyway due to mirroring
    uint16 addr2 = S9xGetWord(Immediate16(READ));
    OpenBus=addr2>>8;
    return addr2;
}

STATIC inline uint32 AbsoluteSlow (AccessMode a) {  // a
    return ICPU.ShiftedDB|Immediate16Slow(a);
}

STATIC inline uint32 Absolute (AccessMode a) {  // a
    return ICPU.ShiftedDB|Immediate16(a);
}

STATIC inline uint32 AbsoluteLongSlow (AccessMode a) { // l
    uint32 addr = Immediate16Slow(READ);

    // JSR l pushes the old bank in the middle of loading the new.
    // OpenBus needs to be set to account for this.
    if(a==JSR) OpenBus = Registers.PB;
    
    addr |= Immediate8Slow(a)<<16;
    return addr;
}

STATIC inline uint32 AbsoluteLong (AccessMode a) { // l
    uint32 addr = READ_3WORD(CPU.PCBase+Registers.PCw);
    AddCycles(CPU.MemSpeedx2+CPU.MemSpeed);
    if(a&READ) OpenBus = addr>>16;
    Registers.PCw+=3;
    return addr;
}

STATIC inline uint32 DirectSlow (AccessMode a) {  // d
    uint16 addr = Immediate8Slow(a) + Registers.D.W;
    if(Registers.DL!=0) AddCycles(ONE_CYCLE);
    return addr;
}

STATIC inline uint32 Direct (AccessMode a) {  // d
    uint16 addr = Immediate8(a) + Registers.D.W;
    if(Registers.DL!=0) AddCycles(ONE_CYCLE);
    return addr;
}

STATIC inline uint32 DirectIndirectSlow (AccessMode a) {  // (d)
    uint32 addr = S9xGetWord(DirectSlow(READ),
                             (!CheckEmulation() || Registers.DL)?WRAP_BANK:WRAP_PAGE);
    if(a&READ) OpenBus=(uint8)(addr>>8);
    addr |= ICPU.ShiftedDB;
    return addr;
}

STATIC inline uint32 DirectIndirectE0 (AccessMode a) {  // (d)
    uint32 addr = S9xGetWord(Direct(READ));
    if(a&READ) OpenBus = (uint8)(addr>>8);
    addr |= ICPU.ShiftedDB;
    return addr;
}

STATIC inline uint32 DirectIndirectE1 (AccessMode a) {  // (d)
    uint32 addr = S9xGetWord(DirectSlow(READ),
                             Registers.DL?WRAP_BANK:WRAP_PAGE);
    if(a&READ) OpenBus=(uint8)(addr>>8);
    addr |= ICPU.ShiftedDB;
    return addr;
}

STATIC inline uint32 DirectIndirectIndexedSlow (AccessMode a) { // (d),Y
    uint32 addr = DirectIndirectSlow(a);
    if(a&WRITE || !CheckIndex() || (addr&0xff)+Registers.YL>=0x100) AddCycles(ONE_CYCLE);
    return (addr + Registers.Y.W);
}

STATIC inline uint32 DirectIndirectIndexedE0X0 (AccessMode a) { // (d),Y
    uint32 addr = DirectIndirectE0(a);
    AddCycles(ONE_CYCLE);
    return (addr + Registers.Y.W);
}

STATIC inline uint32 DirectIndirectIndexedE0X1 (AccessMode a) { // (d),Y
    uint32 addr = DirectIndirectE0(a);
    if(a&WRITE || (addr&0xff)+Registers.YL>=0x100) AddCycles(ONE_CYCLE);
    return (addr + Registers.Y.W);
}

STATIC inline uint32 DirectIndirectIndexedE1 (AccessMode a) { // (d),Y
    uint32 addr = DirectIndirectE1(a);
    if(a&WRITE || (addr&0xff)+Registers.YL>=0x100) AddCycles(ONE_CYCLE);
    return (addr + Registers.Y.W);
}

STATIC inline uint32 DirectIndirectLongSlow (AccessMode a) {  // [d]
    uint16 addr = DirectSlow(READ);
    uint32 addr2 = S9xGetWord(addr);
    OpenBus=addr2>>8;
    addr2 |= (OpenBus = S9xGetByte(addr+2))<<16;
    return addr2;
}

STATIC inline uint32 DirectIndirectLong (AccessMode a) {  // [d]
    uint16 addr = Direct(READ);
    uint32 addr2 = S9xGetWord(addr);
    OpenBus=addr2>>8;
    addr2 |= (OpenBus = S9xGetByte(addr+2))<<16;
    return addr2;
}

STATIC inline uint32 DirectIndirectIndexedLongSlow (AccessMode a) { // [d],Y
    return DirectIndirectLongSlow(a) + Registers.Y.W;
}

STATIC inline uint32 DirectIndirectIndexedLong (AccessMode a) { // [d],Y
    return DirectIndirectLong(a) + Registers.Y.W;
}

STATIC inline uint32 DirectIndexedXSlow (AccessMode a) {  // d,X
    pair addr;
    addr.W = DirectSlow(a);
    if(!CheckEmulation() || Registers.DL){
        addr.W+=Registers.X.W;
    } else {
        addr.B.l+=Registers.XL;
    }
    AddCycles(ONE_CYCLE);
    return addr.W;
}

STATIC inline uint32 DirectIndexedXE0 (AccessMode a) {  // d,X
    uint16 addr = Direct(a) + Registers.X.W;
    AddCycles(ONE_CYCLE);
    return addr;
}

STATIC inline uint32 DirectIndexedXE1 (AccessMode a) {  // d,X
    if(Registers.DL){
        return DirectIndexedXE0(a);
    } else {
        pair addr;
        addr.W = Direct(a);
        addr.B.l+=Registers.XL;
        AddCycles(ONE_CYCLE);
        return addr.W;
    }
}

STATIC inline uint32 DirectIndexedYSlow (AccessMode a) {  // d,Y
    pair addr;
    addr.W = DirectSlow(a);
    if(!CheckEmulation() || Registers.DL){
        addr.W+=Registers.Y.W;
    } else {
        addr.B.l+=Registers.YL;
    }
    AddCycles(ONE_CYCLE);
    return addr.W;
}

STATIC inline uint32 DirectIndexedYE0 (AccessMode a) {  // d,Y
    uint16 addr = Direct(a) + Registers.Y.W;
    AddCycles(ONE_CYCLE);
    return addr;
}

STATIC inline uint32 DirectIndexedYE1 (AccessMode a) {  // d,Y
    if(Registers.DL){
        return DirectIndexedYE0(a);
    } else {
        pair addr;
        addr.W = Direct(a);
        addr.B.l+=Registers.YL;
        AddCycles(ONE_CYCLE);
        return addr.W;
    }
}

STATIC inline uint32 DirectIndexedIndirectSlow (AccessMode a) {  // (d,X)
    uint32 addr = S9xGetWord(DirectIndexedXSlow(READ),
                             (!CheckEmulation() || Registers.DL)?WRAP_BANK:WRAP_PAGE);
    if(a&READ) OpenBus=(uint8)(addr>>8);
    return ICPU.ShiftedDB|addr;
}

STATIC inline uint32 DirectIndexedIndirectE0 (AccessMode a) {  // (d,X)
    uint32 addr = S9xGetWord(DirectIndexedXE0(READ));
    if(a&READ) OpenBus = (uint8)(addr>>8);
    return ICPU.ShiftedDB|addr;
}

STATIC inline uint32 DirectIndexedIndirectE1 (AccessMode a) {  // (d,X)
    uint32 addr = S9xGetWord(DirectIndexedXE1(READ),
                             Registers.DL?WRAP_BANK:WRAP_PAGE);
    if(a&READ) OpenBus=(uint8)(addr>>8);
    return ICPU.ShiftedDB|addr;
}

STATIC inline uint32 AbsoluteIndexedXSlow (AccessMode a) {  // a,X
    uint32 addr = AbsoluteSlow(a);
    if(a&WRITE || !CheckIndex() || (addr&0xff)+Registers.XL>=0x100) AddCycles(ONE_CYCLE);
    return (addr + Registers.X.W);
}

STATIC inline uint32 AbsoluteIndexedXX0 (AccessMode a) {  // a,X
    uint32 addr = Absolute(a);
    AddCycles(ONE_CYCLE);
    return (addr + Registers.X.W);
}

STATIC inline uint32 AbsoluteIndexedXX1 (AccessMode a) {  // a,X
    uint32 addr = Absolute(a);
    if(a&WRITE || (addr&0xff)+Registers.XL>=0x100) AddCycles(ONE_CYCLE);
    return (addr + Registers.X.W);
}

STATIC inline uint32 AbsoluteIndexedYSlow (AccessMode a) {  // a,Y
    uint32 addr = AbsoluteSlow(a);
    if(a&WRITE || !CheckIndex() || (addr&0xff)+Registers.YL>=0x100) AddCycles(ONE_CYCLE);
    return (addr + Registers.Y.W);
}

STATIC inline uint32 AbsoluteIndexedYX0 (AccessMode a) {  // a,Y
    uint32 addr = Absolute(a);
    AddCycles(ONE_CYCLE);
    return (addr + Registers.Y.W);
}

STATIC inline uint32 AbsoluteIndexedYX1 (AccessMode a) {  // a,Y
    uint32 addr = Absolute(a);
    if(a&WRITE || (addr&0xff)+Registers.YL>=0x100) AddCycles(ONE_CYCLE);
    return (addr + Registers.Y.W);
}

STATIC inline uint32 AbsoluteLongIndexedXSlow (AccessMode a) {  // l,X
    return (AbsoluteLongSlow(a) + Registers.X.W);
}

STATIC inline uint32 AbsoluteLongIndexedX (AccessMode a) {  // l,X
    return (AbsoluteLong(a) + Registers.X.W);
}

STATIC inline uint32 StackRelativeSlow (AccessMode a) {  // d,S
    uint16 addr = Immediate8Slow(a) + Registers.S.W;
    AddCycles(ONE_CYCLE);
    return addr;
}

STATIC inline uint32 StackRelative (AccessMode a) {  // d,S
    uint16 addr = Immediate8(a) + Registers.S.W;
    AddCycles(ONE_CYCLE);
    return addr;
}

STATIC inline uint32 StackRelativeIndirectIndexedSlow (AccessMode a) { // (d,S),Y
    uint32 addr=S9xGetWord(StackRelativeSlow(READ));
    if(a&READ) OpenBus = (uint8)(addr>>8);
    addr = (addr+Registers.Y.W+ICPU.ShiftedDB)&0xffffff;
    AddCycles(ONE_CYCLE);
    return addr;
}

STATIC inline uint32 StackRelativeIndirectIndexed (AccessMode a) { // (d,S),Y
    uint32 addr=S9xGetWord(StackRelative(READ));
    if(a&READ) OpenBus = (uint8)(addr>>8);
    addr = (addr+Registers.Y.W+ICPU.ShiftedDB)&0xffffff;
    AddCycles(ONE_CYCLE);
    return addr;
}
#endif