path: root/source/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 2001 - 2004 John Weidman (jweidman@slip.net)

  (c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net),
                            funkyass (funkyass@spam.shaw.ca),
                            Joel Yliluoma (http://iki.fi/bisqwit/)
                            Kris Bleakley (codeviolation@hotmail.com),
                            Matthew Kendora,
                            Nach (n-a-c-h@users.sourceforge.net),
                            Peter Bortas (peter@bortas.org) and
                            zones (kasumitokoduck@yahoo.com)

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

  C4 C++ code
  (c) Copyright 2003 Brad Jorsch

  DSP-1 emulator code
  (c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
                            John Weidman, neviksti (neviksti@hotmail.com),
                            Kris Bleakley, Andreas Naive

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

  OBC1 emulator code
  (c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and
                            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, and Dark Force

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

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

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

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

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


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

  (c) Copyright 2014 - 2016 Daniel De Matteis. (UNDER NO CIRCUMSTANCE 
  WILL COMMERCIAL RIGHTS EVER BE APPROPRIATED TO ANY PARTY)

  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 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 _CPUADDR_H_
#define _CPUADDR_H_

typedef enum
{
   NONE = 0,
   READ = 1,
   WRITE = 2,
   MODIFY = 3,
   JUMP = 4
} AccessMode;

// The type for a function that can run after the addressing mode is resolved:
// void NAME (long Addr) {...}
typedef void (*InternalOp)(long);

static void Immediate8(AccessMode a, InternalOp op)
{
   long Addr = ICPU.ShiftedPB + CPU.PC - CPU.PCBase;
   CPU.PC++;
   (*op)(Addr);
}

static void Immediate16(AccessMode a, InternalOp op)
{
   long Addr = ICPU.ShiftedPB + CPU.PC - CPU.PCBase;
   CPU.PC += 2;
   (*op)(Addr);
}

static void Relative(AccessMode a, InternalOp op)
{
   int8_t Int8 = *CPU.PC++;
   long Addr = ((intptr_t)(CPU.PC - CPU.PCBase) + Int8) & 0xffff;
   (*op)(Addr);
}

static void RelativeLong(AccessMode a, InternalOp op)
{
   long Addr;
#ifdef FAST_LSB_WORD_ACCESS
   Addr = *(uint16_t*) CPU.PC;
#else
   Addr = *CPU.PC + (*(CPU.PC + 1) << 8);
#endif
   CPU.PC += 2;
   Addr += (CPU.PC - CPU.PCBase);
   Addr &= 0xffff;
   (*op)(Addr);
}

static void AbsoluteIndexedIndirect(AccessMode a, InternalOp op)
{
   long Addr;
#ifdef FAST_LSB_WORD_ACCESS
   Addr = (ICPU.Registers.X.W + * (uint16_t*) CPU.PC) & 0xffff;
#else
   Addr = (ICPU.Registers.X.W + *CPU.PC + (*(CPU.PC + 1) << 8)) & 0xffff;
#endif
   OpenBus = *(CPU.PC + 1);
   CPU.PC += 2;
   Addr = S9xGetWord(ICPU.ShiftedPB + Addr);
   if (a & READ) OpenBus = (uint8_t)(Addr >> 8);
   (*op)(Addr);
}

static void AbsoluteIndirectLong(AccessMode a, InternalOp op)
{
   long Addr;
#ifdef FAST_LSB_WORD_ACCESS
   Addr = *(uint16_t*) CPU.PC;
#else
   Addr = *CPU.PC + (*(CPU.PC + 1) << 8);
#endif

   OpenBus = *(CPU.PC + 1);
   CPU.PC += 2;
   if (a & READ)
      Addr = S9xGetWord(Addr) | ((OpenBus = S9xGetByte(Addr + 2)) << 16);
   else
      Addr = S9xGetWord(Addr) | (S9xGetByte(Addr + 2) << 16);
   (*op)(Addr);
}

static void AbsoluteIndirect(AccessMode a, InternalOp op)
{
   long Addr;
#ifdef FAST_LSB_WORD_ACCESS
   Addr = *(uint16_t*) CPU.PC;
#else
   Addr = *CPU.PC + (*(CPU.PC + 1) << 8);
#endif

   OpenBus = *(CPU.PC + 1);
   CPU.PC += 2;
   Addr = S9xGetWord(Addr);
   if (a & READ) OpenBus = (uint8_t)(Addr >> 8);
   Addr += ICPU.ShiftedPB;
   (*op)(Addr);
}

static void Absolute(AccessMode a, InternalOp op)
{
   long Addr;
#ifdef FAST_LSB_WORD_ACCESS
   Addr = *(uint16_t*) CPU.PC + ICPU.ShiftedDB;
#else
   Addr = *CPU.PC + (*(CPU.PC + 1) << 8) + ICPU.ShiftedDB;
#endif
   if (a & READ) OpenBus = *(CPU.PC + 1);
   CPU.PC += 2;
   (*op)(Addr);
}

static void AbsoluteLong(AccessMode a, InternalOp op)
{
   long Addr;
#ifdef FAST_LSB_WORD_ACCESS
   Addr = (*(uint32_t*) CPU.PC) & 0xffffff;
#elif defined FAST_ALIGNED_LSB_WORD_ACCESS
   if (((intptr_t) CPU.PC & 1) == 0)
      Addr = (*(uint16_t*) CPU.PC) + (*(CPU.PC + 2) << 16);
   else
      Addr = *CPU.PC + ((*(uint16_t*)(CPU.PC + 1)) << 8);
#else
   Addr = *CPU.PC + (*(CPU.PC + 1) << 8) + (*(CPU.PC + 2) << 16);
#endif
   if (a & READ) OpenBus = *(CPU.PC + 2);
   CPU.PC += 3;
   (*op)(Addr);
}

static void Direct(AccessMode a, InternalOp op)
{
   if (a & READ) OpenBus = *CPU.PC;
   long Addr = (*CPU.PC++ + ICPU.Registers.D.W) & 0xffff;
   //    if (ICPU.Registers.DL != 0) CPU.Cycles += ONE_CYCLE;
   (*op)(Addr);
}

static void DirectIndirectIndexed(AccessMode a, InternalOp op)
{
   OpenBus = *CPU.PC;
   long Addr = (*CPU.PC++ + ICPU.Registers.D.W) & 0xffff;

   Addr = S9xGetWord(Addr);
   if (a & READ) OpenBus = (uint8_t)(Addr >> 8);
   Addr += ICPU.ShiftedDB + ICPU.Registers.Y.W;

   //    if (ICPU.Registers.DL != 0) CPU.Cycles += ONE_CYCLE;
   // XXX: always add one if STA
   // XXX: else Add one cycle if crosses page boundary
   (*op)(Addr);
}

static void DirectIndirectIndexedLong(AccessMode a, InternalOp op)
{
   OpenBus = *CPU.PC;
   long Addr = (*CPU.PC++ + ICPU.Registers.D.W) & 0xffff;

   if (a & READ)
      Addr = S9xGetWord(Addr) + ((OpenBus = S9xGetByte(Addr + 2)) << 16) +
             ICPU.Registers.Y.W;
   else
      Addr = S9xGetWord(Addr) + (S9xGetByte(Addr + 2) << 16) + ICPU.Registers.Y.W;
   //    if (ICPU.Registers.DL != 0) CPU.Cycles += ONE_CYCLE;
   (*op)(Addr);
}

static void DirectIndexedIndirect(AccessMode a, InternalOp op)
{
   OpenBus = *CPU.PC;
   long Addr = (*CPU.PC++ + ICPU.Registers.D.W + ICPU.Registers.X.W) & 0xffff;

   Addr = S9xGetWord(Addr);
   if (a & READ) OpenBus = (uint8_t)(Addr >> 8);
   Addr += ICPU.ShiftedDB;
   (*op)(Addr);
}

static void DirectIndexedX(AccessMode a, InternalOp op)
{
   if (a & READ) OpenBus = *CPU.PC;
   long Addr = (*CPU.PC++ + ICPU.Registers.D.W + ICPU.Registers.X.W);
   Addr &= CheckEmulation() ? 0xff : 0xffff;

   (*op)(Addr);
}

static void DirectIndexedY(AccessMode a, InternalOp op)
{
   if (a & READ) OpenBus = *CPU.PC;
   long Addr = (*CPU.PC++ + ICPU.Registers.D.W + ICPU.Registers.Y.W);
   Addr &= CheckEmulation() ? 0xff : 0xffff;
   (*op)(Addr);
}

static void AbsoluteIndexedX(AccessMode a, InternalOp op)
{
   long Addr;
#ifdef FAST_LSB_WORD_ACCESS
   Addr = ICPU.ShiftedDB + *(uint16_t*) CPU.PC + ICPU.Registers.X.W;
#else
   Addr = ICPU.ShiftedDB + *CPU.PC + (*(CPU.PC + 1) << 8) +
          ICPU.Registers.X.W;
#endif
   if (a & READ) OpenBus = *(CPU.PC + 1);
   CPU.PC += 2;
   // XXX: always add one cycle for ROL, LSR, etc
   // XXX: else is cross page boundary add one cycle
   (*op)(Addr);
}

static void AbsoluteIndexedY(AccessMode a, InternalOp op)
{
   long Addr;
#ifdef FAST_LSB_WORD_ACCESS
   Addr = ICPU.ShiftedDB + *(uint16_t*) CPU.PC + ICPU.Registers.Y.W;
#else
   Addr = ICPU.ShiftedDB + *CPU.PC + (*(CPU.PC + 1) << 8) +
          ICPU.Registers.Y.W;
#endif
   if (a & READ) OpenBus = *(CPU.PC + 1);
   CPU.PC += 2;
   // XXX: always add cycle for STA
   // XXX: else is cross page boundary add one cycle
   (*op)(Addr);
}

static void AbsoluteLongIndexedX(AccessMode a, InternalOp op)
{
   long Addr;
#ifdef FAST_LSB_WORD_ACCESS
   Addr = (*(uint32_t*) CPU.PC + ICPU.Registers.X.W) & 0xffffff;
#elif defined FAST_ALIGNED_LSB_WORD_ACCESS
   if (((intptr_t) CPU.PC & 1) == 0)
      Addr = ((*(uint16_t*) CPU.PC) + (*(CPU.PC + 2) << 16) + ICPU.Registers.X.W) &
             0xFFFFFF;
   else
      Addr = (*CPU.PC + ((*(uint16_t*)(CPU.PC + 1)) << 8) + ICPU.Registers.X.W) &
             0xFFFFFF;
#else
   Addr = (*CPU.PC + (*(CPU.PC + 1) << 8) + (*(CPU.PC + 2) << 16) +
           ICPU.Registers.X.W) & 0xffffff;
#endif
   if (a & READ) OpenBus = *(CPU.PC + 2);
   CPU.PC += 3;
   (*op)(Addr);
}

static void DirectIndirect(AccessMode a, InternalOp op)
{
   OpenBus = *CPU.PC;
   long Addr = (*CPU.PC++ + ICPU.Registers.D.W) & 0xffff;
   Addr = S9xGetWord(Addr);
   if (a & READ) OpenBus = (uint8_t)(Addr >> 8);
   Addr += ICPU.ShiftedDB;

   //    if (ICPU.Registers.DL != 0) CPU.Cycles += ONE_CYCLE;
   (*op)(Addr);
}

static void DirectIndirectLong(AccessMode a, InternalOp op)
{
   OpenBus = *CPU.PC;
   long Addr = (*CPU.PC++ + ICPU.Registers.D.W) & 0xffff;
   if (a & READ)
      Addr = S9xGetWord(Addr) + ((OpenBus = S9xGetByte(Addr + 2)) << 16);
   else
      Addr = S9xGetWord(Addr) + (S9xGetByte(Addr + 2) << 16);
   //    if (ICPU.Registers.DL != 0) CPU.Cycles += ONE_CYCLE;
   (*op)(Addr);
}

static void StackRelative(AccessMode a, InternalOp op)
{
   if (a & READ) OpenBus = *CPU.PC;
   long Addr = (*CPU.PC++ + ICPU.Registers.S.W) & 0xffff;
   (*op)(Addr);
}

static void StackRelativeIndirectIndexed(AccessMode a, InternalOp op)
{
   OpenBus = *CPU.PC;
   long Addr = (*CPU.PC++ + ICPU.Registers.S.W) & 0xffff;
   Addr = S9xGetWord(Addr);
   if (a & READ) OpenBus = (uint8_t)(Addr >> 8);
   Addr = (Addr + ICPU.ShiftedDB +
           ICPU.Registers.Y.W) & 0xffffff;
   (*op)(Addr);
}
#endif