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#include "../copyright"
#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:
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;
(*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;
// 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;
(*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;
(*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);
(*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
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