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Instruction Table interface.
This commit is contained in:
Seth Morabito
parent
8df561d292
commit
d18c1c7f82
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@ -3,20 +3,20 @@ package com.loomcom.lm6502;
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/**
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* Main 6502 CPU Simulation.
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*/
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public class Cpu {
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public class Cpu implements InstructionTable {
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/* The Bus */
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private Bus bus;
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/* User Registers */
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private int a; // Accumulator
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private int x; // X index register
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private int y; // Y index register
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private int a; // Accumulator
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private int x; // X index register
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private int y; // Y index register
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/* Internal Registers */
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private int pc; // Program Counter register
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private int sp; // Stack Pointer register
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private int ir; // Instruction register
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private int pc; // Program Counter register
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private int sp; // Stack Pointer register
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private int ir; // Instruction register
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/**
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* Construct a new CPU.
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@ -48,5 +48,29 @@ public class Cpu {
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ir = 0;
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}
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/**
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* Performs an individual machine cycle.
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*/
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public void step() {
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// 1. Fetch memory
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ir = bus.read(pc);
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// 2. Decode the instruction and execute.
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// x. Increment PC
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incProgramCounter();
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}
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/*
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* Increment the PC, rolling over if necessary.
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*/
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private void incProgramCounter() {
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if (pc == 0xffff) {
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pc = 0;
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} else {
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++pc;
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}
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}
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}
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195
src/main/java/com/loomcom/lm6502/InstructionTable.java
Normal file
195
src/main/java/com/loomcom/lm6502/InstructionTable.java
Normal file
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@ -0,0 +1,195 @@
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package com.loomcom.lm6502;
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public interface InstructionTable {
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// Addressing mode Enumeration
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public enum Mode {
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ACC {
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public String toString() {
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return "Accumulator";
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}
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},
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ABS {
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public String toString() {
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return "Absolute";
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}
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},
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ABX {
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public String toString() {
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return "Absolute, X-indexed";
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}
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},
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ABY {
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public String toString() {
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return "Absolute, Y-indexed";
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}
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},
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IMM {
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public String toString() {
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return "Immediate";
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}
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},
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IMP {
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public String toString() {
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return "Implied";
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}
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},
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IND {
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public String toString() {
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return "Indirect";
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}
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},
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XIN {
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public String toString() {
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return "X-indexed Indirect";
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}
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},
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INY {
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public String toString() {
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return "Indirect, Y-indexedY";
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}
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},
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REL {
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public String toString() {
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return "Relative";
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}
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},
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ZPG {
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public String toString() {
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return "Zeropage";
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}
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},
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ZPX {
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public String toString() {
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return "Zeropage, X-indexed";
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}
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},
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ZPY {
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public String toString() {
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return "Zeropage, Y-indexed";
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}
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},
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NUL {
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public String toString() {
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return "NULL";
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}
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}
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}
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// 6502 opcodes. No 65C02 opcodes implemented.
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public static final String[] opcodeNames = {
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"BRK", "ORA", null, null, null, "ORA", "ASL", null,
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"PHP", "ORA", "ASL", null, null, "ORA", "ASL", null,
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"BPL", "ORA", null, null, null, "ORA", "ASL", null,
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"CLC", "ORA", null, null, null, "ORA", "ASL", null,
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"JSR", "AND", null, null, "BIT", "AND", "ROL", null,
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"PLP", "AND", "ROL", null, "BIT", "AND", "ROL", null,
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"BMI", "AND", null, null, null, "AND", "ROL", null,
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"SEC", "AND", null, null, null, "AND", "ROL", null,
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"RTI", "EOR", null, null, null, "EOR", "LSR", null,
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"PHA", "EOR", "LSR", null, "JMP", "EOR", "LSR", null,
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"BVC", "EOR", null, null, null, "EOR", "LSR", null,
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"CLI", "EOR", null, null, null, "EOR", "LSR", null,
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"RTS", "ADC", null, null, null, "ADC", "ROR", null,
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"PLA", "ADC", "ROR", null, "JMP", "ADC", "ROR", null,
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"BVS", "ADC", null, null, null, "ADC", "ROR", null,
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"SEI", "ADC", null, null, null, "ADC", "ROR", null,
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"BCS", "STA", null, null, "STY", "STA", "STX", null,
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"DEY", null, "TXA", null, "STY", "STA", "STX", null,
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"BCC", "STA", null, null, "STY", "STA", "STX", null,
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"TYA", "STA", "TXS", null, null, "STA", null, null,
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"LDY", "LDA", "LDX", null, "LDY", "LDA", "LDX", null,
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"TAY", "LDA", "TAX", null, "LDY", "LDA", "LDX", null,
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null, "LDA", null, null, "LDY", "LDA", "LDX", null,
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"CLV", "LDA", "TSX", null, "LDY", "LDA", "LDX", null,
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"CPY", "CMP", null, null, "CPY", "CMP", "DEC", null,
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"INY", "CMP", "DEX", null, "CPY", "CMP", "DEC", null,
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"BNE", "CMP", null, null, null, "CMP", "DEC", null,
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"CLD", "CMP", null, null, null, "CMP", "DEC", null,
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"CPX", "SBC", null, null, "CPX", "SBC", "INC", null,
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"INX", "SBC", "NOP", null, "CPX", "SBC", "INC", null,
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"BEQ", "SBC", null, null, null, "SBC", "INC", null,
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"SED", "SBC", null, null, null, "SBC", "INC", null
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};
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public static final Mode[] opcodeModes = {
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Mode.IMP, Mode.XIN, Mode.NUL, Mode.NUL, // 0x00-0x03
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Mode.NUL, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x04-0x07
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Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x08-0x0b
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Mode.NUL, Mode.ABS, Mode.ABS, Mode.NUL, // 0x0c-0x0f
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Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x10-0x13
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Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x14-0x17
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Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x18-0x1b
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Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x1c-0x1f
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Mode.ABS, Mode.XIN, Mode.NUL, Mode.NUL, // 0x20-0x23
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Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x24-0x27
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Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x28-0x2b
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Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0x2c-0x2f
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Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x30-0x33
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Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x34-0x37
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Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x38-0x3b
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Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x3c-0x3f
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Mode.IMP, Mode.XIN, Mode.NUL, Mode.NUL, // 0x40-0x43
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Mode.NUL, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x44-0x47
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Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x48-0x4b
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Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0x4c-0x4f
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Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x50-0x53
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Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x54-0x57
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Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x58-0x5b
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Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x5c-0x5f
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Mode.IMP, Mode.XIN, Mode.NUL, Mode.NUL, // 0x60-0x63
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Mode.NUL, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x64-0x67
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Mode.IMP, Mode.IMM, Mode.ACC, Mode.NUL, // 0x68-0x6b
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Mode.IND, Mode.ABS, Mode.ABS, Mode.NUL, // 0x6c-0x6f
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Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x70-0x73
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Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0x74-0x77
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Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0x78-0x7b
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Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0x7c-0x7f
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Mode.REL, Mode.XIN, Mode.NUL, Mode.NUL, // 0x80-0x83
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Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0x84-0x87
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Mode.IMP, Mode.NUL, Mode.IMP, Mode.NUL, // 0x88-0x8b
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Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0x8c-0x8f
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Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0x90-0x93
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Mode.ZPX, Mode.ZPX, Mode.ZPY, Mode.NUL, // 0x94-0x97
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Mode.IMP, Mode.ABX, Mode.IMP, Mode.NUL, // 0x98-0x9b
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Mode.NUL, Mode.ABY, Mode.NUL, Mode.NUL, // 0x9c-0x9f
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Mode.IMM, Mode.XIN, Mode.IMM, Mode.NUL, // 0xa0-0xa3
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Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0xa4-0xa7
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Mode.IMP, Mode.IMM, Mode.IMP, Mode.NUL, // 0xa8-0xab
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Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0xac-0xaf
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Mode.NUL, Mode.INY, Mode.NUL, Mode.NUL, // 0xb0-0xb3
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Mode.ZPX, Mode.ZPX, Mode.ZPY, Mode.NUL, // 0xb4-0xb7
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Mode.IMP, Mode.ABX, Mode.IMP, Mode.NUL, // 0xb8-0xbb
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Mode.ABX, Mode.ABY, Mode.ABY, Mode.NUL, // 0xbc-0xbf
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Mode.IMM, Mode.XIN, Mode.NUL, Mode.NUL, // 0xc0-0xc3
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Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0xc4-0xc7
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Mode.IMP, Mode.IMM, Mode.IMP, Mode.NUL, // 0xc8-0xcb
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Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0xcc-0xcf
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Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0xd0-0xd3
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Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0xd4-0xd7
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Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0xd8-0xdb
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Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL, // 0xdc-0xdf
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Mode.IMM, Mode.XIN, Mode.NUL, Mode.NUL, // 0xe0-0xe3
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Mode.ZPG, Mode.ZPG, Mode.ZPG, Mode.NUL, // 0xe4-0xe7
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Mode.IMP, Mode.IMM, Mode.IMP, Mode.NUL, // 0xe8-0xeb
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Mode.ABS, Mode.ABS, Mode.ABS, Mode.NUL, // 0xec-0xef
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Mode.REL, Mode.INY, Mode.NUL, Mode.NUL, // 0xf0-0xf3
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Mode.NUL, Mode.ZPX, Mode.ZPX, Mode.NUL, // 0xf4-0xf7
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Mode.IMP, Mode.ABY, Mode.NUL, Mode.NUL, // 0xf8-0xfb
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Mode.NUL, Mode.ABX, Mode.ABX, Mode.NUL // 0xfc-0xff
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};
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}
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@ -9,8 +9,31 @@ import java.util.*;
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import com.loomcom.lm6502.devices.*;
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import com.loomcom.lm6502.exceptions.*;
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public class Profiler {
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public class Profiler implements InstructionTable {
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public static void main(String[] args) {
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// new Profiler().profileMemoryReads();
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new Profiler().dumpOpCodes();
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}
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public void dumpOpCodes() {
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for (int i = 0; i < 0x100; i++) {
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String name = opcodeNames[i];
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Mode mode = opcodeModes[i];
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System.out.print(String.format("0x%02x: ", i));
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if (name == null) {
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System.out.println("n/a");
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} else {
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System.out.println(name + " (" + mode + ")");
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}
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}
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}
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public void profileMemoryReads() {
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try {
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