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// table.c
#include"table.h"
void* InstructionTable;
void (*Instruction)(Addressing);
// Macros for accessing the InstructionTable
#define InstructionTableFunction(x) ((uintptr_t*)(InstructionTable + (sizeof(uintptr_t) * x)))
#define InstructionTableAddressing(x) ((Addressing*)(InstructionTable + (sizeof(uintptr_t) * 256) + (sizeof(Addressing) * x)))
#define InstructionTableCycles(x) ((int*)(InstructionTable + (sizeof(uintptr_t) * 256) + (sizeof(Addressing) * 256) + (sizeof(int) * x)))
const InstructionTableSize = (256 * (sizeof(uintptr_t) + sizeof(Addressing) + sizeof(int)));
void CallInstructionTable()
{
// Set function.
memcpy(&Instruction,
InstructionTableFunction((int)GetMemory(PC)),
sizeof(uintptr_t));
// Find the addressing mode.
Addressing r = *InstructionTableAddressing(GetMemory(PC));
// Set val
int val = 0;
if (fAddressGetLength(r) >= 2)
val += GetMemory(PC+1);
if (fAddressGetLength(r) == 3)
val += ((address)GetMemory(PC+2)) << 8;
// Set state
state = fAddress(r, val);
// Perform function
Instruction(r);
// Incrememt the program counter.
PC += state.length;
}
void SetInstructionTable(int index, void* function, Addressing addressing, int cycles)
{
*InstructionTableFunction(index) = (uintptr_t)function;
*InstructionTableAddressing(index) = addressing;
*InstructionTableCycles(index) = cycles;
}
void InitInstructionTable()
{
// Create InstructionTable
InstructionTable = malloc(InstructionTableSize);
// Load and Store Instructions
// LDA
SetInstructionTable(0xA9, &LDA, eImmediate, 2);
SetInstructionTable(0xA5, &LDA, eZeroPage, 3);
SetInstructionTable(0xB5, &LDA, eZeroPageIndexedX, 4);
SetInstructionTable(0xAD, &LDA, eAbsolute, 4);
SetInstructionTable(0xBD, &LDA, eAbsoluteIndexedX, 4);
SetInstructionTable(0xB9, &LDA, eAbsoluteIndexedY, 4);
SetInstructionTable(0xA1, &LDA, eIndexedIndirect, 6);
SetInstructionTable(0xB1, &LDA, eIndirectIndexed, 5);
// LDX
SetInstructionTable(0xA2, &LDX, eImmediate, 2);
SetInstructionTable(0xA6, &LDX, eZeroPage, 3);
SetInstructionTable(0xB6, &LDX, eZeroPageIndexedY, 4);
SetInstructionTable(0xAE, &LDX, eAbsolute, 4);
SetInstructionTable(0xBE, &LDX, eAbsoluteIndexedY, 4);
// LDY
SetInstructionTable(0xA0, &LDY, eImmediate, 2);
SetInstructionTable(0xA4, &LDY, eZeroPage, 3);
SetInstructionTable(0xB4, &LDY, eZeroPageIndexedX, 4);
SetInstructionTable(0xAC, &LDY, eAbsolute, 4);
SetInstructionTable(0xBC, &LDY, eAbsoluteIndexedX, 4);
// STA
SetInstructionTable(0x85, &STA, eZeroPage, 3);
SetInstructionTable(0x95, &STA, eZeroPageIndexedX, 4);
SetInstructionTable(0x8D, &STA, eAbsolute, 4);
SetInstructionTable(0x9D, &STA, eAbsoluteIndexedX, 5);
SetInstructionTable(0x99, &STA, eAbsoluteIndexedY, 5);
SetInstructionTable(0x81, &STA, eIndexedIndirect, 6);
SetInstructionTable(0x91, &STA, eIndirectIndexed, 6);
// STX
SetInstructionTable(0x86, &STX, eZeroPage, 3);
SetInstructionTable(0x96, &STX, eZeroPageIndexedX, 4);
SetInstructionTable(0x8E, &STX, eAbsolute, 4);
// STY
SetInstructionTable(0x84, &STY, eZeroPage, 3);
SetInstructionTable(0x94, &STY, eZeroPageIndexedY, 4);
SetInstructionTable(0x8C, &STY, eAbsolute, 4);
// Arithmetic Instructions
// ADC
SetInstructionTable(0x69, &ADC, eImmediate, 2);
SetInstructionTable(0x65, &ADC, eZeroPage, 3);
SetInstructionTable(0x75, &ADC, eZeroPageIndexedX, 4);
SetInstructionTable(0x6D, &ADC, eAbsolute, 4);
SetInstructionTable(0x7D, &ADC, eAbsoluteIndexedX, 4);
SetInstructionTable(0x79, &ADC, eAbsoluteIndexedY, 4);
SetInstructionTable(0x61, &ADC, eIndexedIndirect, 6);
SetInstructionTable(0x71, &ADC, eIndirectIndexed, 5);
// SBC
SetInstructionTable(0xE9, &SBC, eImmediate, 2);
SetInstructionTable(0xE5, &SBC, eZeroPage, 3);
SetInstructionTable(0xF5, &SBC, eZeroPageIndexedX, 4);
SetInstructionTable(0xED, &SBC, eAbsolute, 4);
SetInstructionTable(0xFD, &SBC, eAbsoluteIndexedX, 4);
SetInstructionTable(0xF9, &SBC, eAbsoluteIndexedY, 4);
SetInstructionTable(0xE1, &SBC, eIndexedIndirect, 6);
SetInstructionTable(0xF1, &SBC, eIndirectIndexed, 5);
// Increment and Decrement Instructions
// INC
SetInstructionTable(0xE6, &INC, eZeroPage, 5);
SetInstructionTable(0xF6, &INC, eZeroPageIndexedX, 6);
SetInstructionTable(0xEE, &INC, eAbsolute, 6);
SetInstructionTable(0xFE, &INC, eAbsoluteIndexedX, 7);
// INX
SetInstructionTable(0xE8, &INX, eImplied, 2);
// INY
SetInstructionTable(0xC8, &INY, eImplied, 2);
// DEC
SetInstructionTable(0xC6, &DEC, eZeroPage, 5);
SetInstructionTable(0xD6, &DEC, eZeroPageIndexedX, 6);
SetInstructionTable(0xCE, &DEC, eAbsolute, 6);
SetInstructionTable(0xDE, &DEC, eAbsoluteIndexedX, 7);
// DEX
SetInstructionTable(0xCA, &DEX, eImplied, 2);
// DEY
SetInstructionTable(0x88, &DEY, eImplied, 2);
// Logical Instructions
// AND
SetInstructionTable(0x29, &AND, eImmediate, 2);
SetInstructionTable(0x25, &AND, eZeroPage, 3);
SetInstructionTable(0x35, &AND, eZeroPageIndexedX, 4);
SetInstructionTable(0x2D, &AND, eAbsolute, 4);
SetInstructionTable(0x3D, &AND, eAbsoluteIndexedX, 4);
SetInstructionTable(0x39, &AND, eAbsoluteIndexedY, 4);
SetInstructionTable(0x21, &AND, eIndexedIndirect, 6);
SetInstructionTable(0x31, &AND, eIndirectIndexed, 5);
// ORA
SetInstructionTable(0x09, &ORA, eImmediate, 2);
SetInstructionTable(0x05, &ORA, eZeroPage, 3);
SetInstructionTable(0x15, &ORA, eZeroPageIndexedX, 4);
SetInstructionTable(0x0D, &ORA, eAbsolute, 4);
SetInstructionTable(0x1D, &ORA, eAbsoluteIndexedX, 4);
SetInstructionTable(0x19, &ORA, eAbsoluteIndexedY, 4);
SetInstructionTable(0x01, &ORA, eIndexedIndirect, 6);
SetInstructionTable(0x11, &ORA, eIndirectIndexed, 5);
// EOR
SetInstructionTable(0x49, &EOR, eImmediate, 2);
SetInstructionTable(0x45, &EOR, eZeroPage, 3);
SetInstructionTable(0x55, &EOR, eZeroPageIndexedX, 4);
SetInstructionTable(0x4D, &EOR, eAbsolute, 4);
SetInstructionTable(0x5D, &EOR, eAbsoluteIndexedX, 4);
SetInstructionTable(0x59, &EOR, eAbsoluteIndexedY, 4);
SetInstructionTable(0x41, &EOR, eIndexedIndirect, 6);
SetInstructionTable(0x51, &EOR, eIndirectIndexed, 5);
// Jump, Branch, Compare, and Test Bits
// JMP
SetInstructionTable(0x4C, &JMP, eAbsolute, 3);
SetInstructionTable(0x6C, &JMP, eIndirectAbsolute, 5);
// BCC
SetInstructionTable(0x90, &BCC, eRelative, 2);
// BCS
SetInstructionTable(0xB0, &BCS, eRelative, 2);
// BEQ
SetInstructionTable(0xF0, &BEQ, eRelative, 2);
// BNE
SetInstructionTable(0xD0, &BNE, eRelative, 2);
// BMI
SetInstructionTable(0x30, &BMI, eRelative, 2);
// BPL
SetInstructionTable(0x10, &BPL, eRelative, 2);
// BVS
SetInstructionTable(0x70, &BVS, eRelative, 2);
// BVC
SetInstructionTable(0x50, &BVC, eRelative, 2);
// CMP
SetInstructionTable(0xC9, &CMP, eImmediate, 2);
SetInstructionTable(0xC5, &CMP, eZeroPage, 3);
SetInstructionTable(0xD5, &CMP, eZeroPageIndexedX, 4);
SetInstructionTable(0xCD, &CMP, eAbsolute, 4);
SetInstructionTable(0xDD, &CMP, eAbsoluteIndexedX, 4);
SetInstructionTable(0xD9, &CMP, eAbsoluteIndexedY, 4);
SetInstructionTable(0xC1, &CMP, eIndexedIndirect, 6);
SetInstructionTable(0xD1, &CMP, eIndirectIndexed, 5);
// CPX
SetInstructionTable(0xE0, &CPX, eImmediate, 2);
SetInstructionTable(0xE4, &CPX, eZeroPage, 3);
SetInstructionTable(0xEC, &CPX, eAbsolute, 4);
// CPY
SetInstructionTable(0xC0, &CPY, eImmediate, 2);
SetInstructionTable(0xC4, &CPY, eZeroPage, 3);
SetInstructionTable(0xCC, &CPY, eAbsolute, 4);
// BIT
SetInstructionTable(0x24, &BIT, eZeroPage, 3);
SetInstructionTable(0x2C, &BIT, eAbsolute, 4);
// Shift and Rotate Instructions
// ASL
SetInstructionTable(0x0A, &ASL, eAccumulator, 2);
SetInstructionTable(0x06, &ASL, eZeroPage, 5);
SetInstructionTable(0x16, &ASL, eZeroPageIndexedX, 6);
SetInstructionTable(0x0E, &ASL, eAbsolute, 6);
SetInstructionTable(0x1E, &ASL, eAbsoluteIndexedX, 7);
// LSR
SetInstructionTable(0x4A, &LSR, eAccumulator, 2);
SetInstructionTable(0x46, &LSR, eZeroPage, 5);
SetInstructionTable(0x56, &LSR, eZeroPageIndexedX, 6);
SetInstructionTable(0x4E, &LSR, eAbsolute, 6);
SetInstructionTable(0x5E, &LSR, eAbsoluteIndexedX, 7);
// ROL
SetInstructionTable(0x2A, &ROL, eAccumulator, 2);
SetInstructionTable(0x26, &ROL, eZeroPage, 5);
SetInstructionTable(0x36, &ROL, eZeroPageIndexedX, 6);
SetInstructionTable(0x2E, &ROL, eAbsolute, 6);
SetInstructionTable(0x3E, &ROL, eAbsoluteIndexedX, 7);
// ROR
SetInstructionTable(0x6A, &ROR, eAccumulator, 2);
SetInstructionTable(0x66, &ROR, eZeroPage, 5);
SetInstructionTable(0x76, &ROR, eZeroPageIndexedX, 6);
SetInstructionTable(0x6E, &ROR, eAbsolute, 6);
SetInstructionTable(0x7E, &ROR, eAbsoluteIndexedX, 7);
// Transfer Instructions
// TAX
SetInstructionTable(0xAA, &TAX, eImplied, 2);
// TAY
SetInstructionTable(0xA8, &TAY, eImplied, 2);
// TXA
SetInstructionTable(0x8A, &TXA, eImplied, 2);
// TYA
SetInstructionTable(0x98, &TYA, eImplied, 2);
// Stack Instructions
// TSX
SetInstructionTable(0xBA, &TSX, eImplied, 2);
// TXS
SetInstructionTable(0x9A, &TXS, eImplied, 2);
// PHA
SetInstructionTable(0x48, &PHA, eImplied, 3);
// PHP
SetInstructionTable(0x08, &PHP, eImplied, 3);
// PLA
SetInstructionTable(0x68, &PLA, eImplied, 4);
// PLP
SetInstructionTable(0x28, &PLP, eImplied, 4);
// Subroutine Instructions
// JSR
SetInstructionTable(0x20, &JSR, eAbsolute, 6);
// RTS
SetInstructionTable(0x60, &RTS, eImplied, 6);
// RTI
SetInstructionTable(0x40, &RTI, eImplied, 6);
// Set/Reset Insutrctions
// CLC
SetInstructionTable(0x18, &CLC, eImplied, 2);
// CLD
SetInstructionTable(0xD8, &CLD, eImplied, 2);
// CLI
SetInstructionTable(0x58, &CLI, eImplied, 2);
// CLV
SetInstructionTable(0xB8, &CLV, eImplied, 2);
// SEC
SetInstructionTable(0x38, &SEC, eImplied, 2);
// SED
SetInstructionTable(0xF8, &SED, eImplied, 2);
// SEI
SetInstructionTable(0x78, &SEI, eImplied, 2);
// NOP/BRK Instructions
// NOP
SetInstructionTable(0xEA, &NOP, eImplied, 2);
// BRK
SetInstructionTable(0x00, &BRK, eImplied, 7);
}
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