adding a basic debug console and fixing issues with branch instructions
This commit is contained in:
Luigi Thirty
parent
a0d28938b7
commit
3c04503525
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@ -16,6 +16,7 @@
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@ -33,6 +34,7 @@
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@ -70,6 +72,7 @@
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@ -166,6 +169,7 @@
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@ -841,7 +841,7 @@
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@ -852,7 +852,7 @@
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<outlet property="text_CPU_SR" destination="5TT-BA-Iw1" id="Bnh-oz-AnZ"/>
|
||||
<outlet property="text_CPU_X" destination="nOs-8C-MbH" id="71D-al-r5q"/>
|
||||
<outlet property="text_CPU_Y" destination="eqA-qk-YQy" id="c88-2h-DES"/>
|
||||
<outlet property="text_debugger_input" destination="gOM-wQ-387" id="2XS-fM-VQn"/>
|
||||
<outlet property="text_debugger_output" destination="3gF-hp-68k" id="esg-CB-lFg"/>
|
||||
</connections>
|
||||
</viewController>
|
||||
<customObject id="rPt-NT-nkU" userLabel="First Responder" customClass="NSResponder" sceneMemberID="firstResponder"/>
|
||||
|
|
|
|||
|
|
@ -0,0 +1,25 @@
|
|||
//
|
||||
// DebugConsole.swift
|
||||
// FruitMachine
|
||||
//
|
||||
// Created by Christopher Rohl on 7/24/17.
|
||||
// Copyright © 2017 Christopher Rohl. All rights reserved.
|
||||
//
|
||||
|
||||
import Cocoa
|
||||
|
||||
class DebugConsole: NSObject {
|
||||
func interpretCommand(command: String) {
|
||||
let commandSplit = command.split(separator: " ")
|
||||
if(commandSplit[0] == "bplist") {
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
class DebugCommands: NSObject {
|
||||
static func bplist() -> String {
|
||||
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,86 @@
|
|||
//
|
||||
// DebuggerCommands.swift
|
||||
// FruitMachine
|
||||
//
|
||||
// Created by Christopher Rohl on 7/24/17.
|
||||
// Copyright © 2017 Christopher Rohl. All rights reserved.
|
||||
//
|
||||
|
||||
import Cocoa
|
||||
|
||||
extension DebuggerViewController {
|
||||
func interpretCommand(command: String) {
|
||||
debugConsolePrint(str: "> \(command)", newline: true)
|
||||
|
||||
let commandSplit = command.components(separatedBy: " ")
|
||||
var parameters: [String] = commandSplit
|
||||
parameters.remove(at: 0)
|
||||
|
||||
if(commandSplit[0] == "bplist")
|
||||
{
|
||||
debugConsolePrint(str: DebuggerCommands.bplist(state: cpuInstance, parameters: parameters), newline: true)
|
||||
}
|
||||
else if(commandSplit[0] == "bpdel")
|
||||
{
|
||||
debugConsolePrint(str: DebuggerCommands.bpdel(state: cpuInstance, parameters: parameters), newline: true)
|
||||
}
|
||||
else if(commandSplit[0] == "bpadd")
|
||||
{
|
||||
debugConsolePrint(str: DebuggerCommands.bpadd(state: cpuInstance, parameters: parameters), newline: true)
|
||||
}
|
||||
else
|
||||
{
|
||||
debugConsolePrint(str: "Unrecognized command", newline: true)
|
||||
}
|
||||
text_debugger_output.scrollToEndOfDocument(self)
|
||||
}
|
||||
}
|
||||
|
||||
class DebuggerCommands: NSObject {
|
||||
static func bplist(state: CPU, parameters: [String]) -> String {
|
||||
var output = ""
|
||||
for (index, bp) in state.breakpoints.enumerated() {
|
||||
output += "Breakpoint \(index): $\(bp.asHexString())\r\n"
|
||||
}
|
||||
|
||||
return output
|
||||
}
|
||||
|
||||
static func bpadd(state: CPU, parameters: [String]) -> String {
|
||||
var output = ""
|
||||
let val = UInt16(parameters[0])
|
||||
|
||||
if(val != nil) {
|
||||
state.breakpoints.append(val!)
|
||||
output += "Breakpoint added at $\(val!.asHexString())."
|
||||
}
|
||||
else {
|
||||
output += "Usage: bpadd <address>"
|
||||
}
|
||||
|
||||
return output
|
||||
}
|
||||
|
||||
static func bpdel(state: CPU, parameters: [String]) -> String {
|
||||
var output = ""
|
||||
let val = Int(parameters[0])
|
||||
|
||||
if(val != nil)
|
||||
{
|
||||
if (val! >= 0 && val! < state.breakpoints.count) {
|
||||
state.breakpoints.remove(at: val!)
|
||||
output += "Breakpoint \(val!) deleted."
|
||||
}
|
||||
else
|
||||
{
|
||||
output += "Breakpoint \(val!) does not exist."
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
output += "Usage: bpdel <breakpoint-number>. Use bplist to find breakpoint numbers."
|
||||
}
|
||||
|
||||
return output
|
||||
}
|
||||
}
|
||||
|
|
@ -16,6 +16,9 @@ class DebuggerViewController: NSViewController {
|
|||
@IBOutlet weak var text_CPU_SR: NSTextField!
|
||||
@IBOutlet weak var text_CPU_Flags: NSTextField!
|
||||
|
||||
@IBOutlet weak var text_debugger_output: NSTextView!
|
||||
@IBOutlet weak var text_debugger_input: NSTextField!
|
||||
|
||||
@IBOutlet weak var debuggerTableView: NSTableView!
|
||||
|
||||
var cpuInstance = CPU.sharedInstance
|
||||
|
|
@ -43,10 +46,8 @@ class DebuggerViewController: NSViewController {
|
|||
text_CPU_SR.stringValue = String(format:"%02X", cpuInstance.stack_pointer)
|
||||
text_CPU_Flags.stringValue = String(cpuInstance.status_register.asString())
|
||||
|
||||
if(!highlightCurrentInstruction()) {
|
||||
disassembly = cpuInstance.disassemble(fromAddress: cpuInstance.program_counter, length: 256)
|
||||
highlightCurrentInstruction()
|
||||
}
|
||||
disassembly = cpuInstance.disassemble(fromAddress: 0, length: 10000)
|
||||
highlightCurrentInstruction()
|
||||
}
|
||||
|
||||
override func viewDidLoad() {
|
||||
|
|
@ -59,9 +60,11 @@ class DebuggerViewController: NSViewController {
|
|||
cpuInstance.performReset()
|
||||
cpuInstance.program_counter = 0x400 //entry point for the test program
|
||||
updateCPUStatusFields()
|
||||
disassembly = cpuInstance.disassemble(fromAddress: cpuInstance.program_counter, length: 10000)
|
||||
disassembly = cpuInstance.disassemble(fromAddress: 0, length: 10000)
|
||||
debuggerTableView.reloadData()
|
||||
|
||||
cpuInstance.breakpoints.append(0x0528)
|
||||
|
||||
// Do any additional setup after loading the view.
|
||||
}
|
||||
|
||||
|
|
@ -75,7 +78,8 @@ class DebuggerViewController: NSViewController {
|
|||
do {
|
||||
try cpuInstance.executeNextInstruction()
|
||||
} catch CPUExceptions.invalidInstruction {
|
||||
print("*** 6502 Exception: Invalid instruction 0xXX at 0xXXXX")
|
||||
isRunning = false
|
||||
|
||||
} catch {
|
||||
print(error)
|
||||
}
|
||||
|
|
@ -83,20 +87,26 @@ class DebuggerViewController: NSViewController {
|
|||
|
||||
func cpuRun() {
|
||||
isRunning = true
|
||||
let queue = DispatchQueue(label: "com.luigithirty.m6502.instructions")
|
||||
let main = DispatchQueue.main
|
||||
|
||||
queue.async {
|
||||
while(self.isRunning == true)
|
||||
{
|
||||
queue.asyncAfter(deadline: .now() + .seconds(1), execute: {
|
||||
self.cpuStep()
|
||||
main.sync {
|
||||
self.updateCPUStatusFields()
|
||||
}
|
||||
})
|
||||
cpuInstance.cycles = 0
|
||||
cpuInstance.cyclesInBatch = 1000
|
||||
|
||||
while(!cpuInstance.checkOutOfCycles() && isRunning) {
|
||||
cpuStep()
|
||||
|
||||
if (cpuInstance.breakpoints.contains(cpuInstance.program_counter)) {
|
||||
isRunning = false
|
||||
updateCPUStatusFields()
|
||||
debugConsolePrint(str: "Breakpoint reached at $\(cpuInstance.program_counter.asHexString())", newline: true)
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func queueCPUStep(queue: DispatchQueue) {
|
||||
queue.async {
|
||||
self.cpuStep()
|
||||
}
|
||||
}
|
||||
|
||||
@IBAction func btn_CPUStep(_ sender: Any) {
|
||||
|
|
@ -112,8 +122,26 @@ class DebuggerViewController: NSViewController {
|
|||
@IBAction func btn_CPURun(_ sender: Any) {
|
||||
cpuRun()
|
||||
}
|
||||
|
||||
@IBAction func btn_CPU_Restart(_ sender: Any) {
|
||||
cpuInstance.performReset()
|
||||
cpuInstance.program_counter = 0x400
|
||||
debugConsolePrint(str: "CPU restarted from $0400", newline: true)
|
||||
}
|
||||
|
||||
|
||||
@IBAction func debuggerInput_submit(_ sender: NSTextField) {
|
||||
interpretCommand(command: sender.stringValue)
|
||||
sender.stringValue = ""
|
||||
}
|
||||
|
||||
func debugConsolePrint(str: String, newline: Bool) {
|
||||
text_debugger_output.appendText(line: str)
|
||||
if(newline) {
|
||||
text_debugger_output.appendText(line:"\r\n")
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
extension DebuggerViewController: NSTableViewDelegate {
|
||||
|
|
@ -150,7 +178,7 @@ extension DebuggerViewController: NSTableViewDelegate {
|
|||
if((operation.data[1] & 0x80) == 0x80) {
|
||||
destination = destination + 1 - UInt16(~operation.data[1])
|
||||
} else {
|
||||
destination = destination + UInt16(operation.data[1])
|
||||
destination = destination + 2 + UInt16(operation.data[1])
|
||||
}
|
||||
cellText = String(format: "%@ #$%04X", operation.instruction!.mnemonic, destination)
|
||||
case .absolute:
|
||||
|
|
@ -204,3 +232,21 @@ extension DebuggerViewController: NSTableViewDataSource {
|
|||
return disassembly[atIndex]
|
||||
}
|
||||
}
|
||||
|
||||
extension NSTextView {
|
||||
func appendText(line: String) {
|
||||
let attrDict = [NSAttributedStringKey.font: NSFont.userFixedPitchFont(ofSize: 11)]
|
||||
let astring = NSAttributedString(string: "\(line)", attributes: attrDict)
|
||||
self.textStorage?.append(astring)
|
||||
let loc = self.string.lengthOfBytes(using: String.Encoding.utf8)
|
||||
|
||||
let range = NSRange(location: loc, length: 0)
|
||||
self.scrollRangeToVisible(range)
|
||||
}
|
||||
}
|
||||
|
||||
func xlog(logView:NSTextView?, line:String) {
|
||||
if let view = logView {
|
||||
view.appendText(line: line)
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -113,6 +113,7 @@ class CPU: NSObject {
|
|||
static var sharedInstance = CPU()
|
||||
|
||||
var cycles: Int
|
||||
var cyclesInBatch: Int
|
||||
|
||||
var instruction_register: UInt8
|
||||
|
||||
|
|
@ -128,8 +129,11 @@ class CPU: NSObject {
|
|||
|
||||
var memoryInterface: MemoryInterface
|
||||
|
||||
var breakpoints: [UInt16]
|
||||
|
||||
override init() {
|
||||
cycles = 0
|
||||
cyclesInBatch = 0
|
||||
|
||||
instruction_register = 0
|
||||
|
||||
|
|
@ -146,6 +150,8 @@ class CPU: NSObject {
|
|||
//Branches incur a 1-cycle penalty if taken plus the page boundary penalty if necessary.
|
||||
branch_was_taken = false
|
||||
|
||||
breakpoints = [UInt16]()
|
||||
|
||||
}
|
||||
|
||||
func getOperandByte() -> UInt8 {
|
||||
|
|
@ -205,6 +211,14 @@ class CPU: NSObject {
|
|||
}
|
||||
}
|
||||
|
||||
func checkOutOfCycles() -> Bool {
|
||||
if(cycles > cyclesInBatch) {
|
||||
return true
|
||||
} else {
|
||||
return false
|
||||
}
|
||||
}
|
||||
|
||||
func performReset() {
|
||||
program_counter = memoryInterface.readWord(offset: RESET_VECTOR)
|
||||
stack_pointer = 0xFF
|
||||
|
|
|
|||
|
|
@ -12,4 +12,8 @@ extension UInt16 {
|
|||
static func + (left: UInt16, right: UInt8) -> UInt16 {
|
||||
return left + UInt16(right)
|
||||
}
|
||||
|
||||
func asHexString() -> String {
|
||||
return String(format: "%04X", self)
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -29,7 +29,7 @@ extension CPU {
|
|||
|
||||
func pushWord(data: UInt16) -> Void {
|
||||
let low = UInt8(data & 0x00FF)
|
||||
let high = UInt8(data & 0xFF00)
|
||||
let high = UInt8((data & 0xFF00) >> 8)
|
||||
|
||||
pushByte(data: low)
|
||||
pushByte(data: high)
|
||||
|
|
@ -52,8 +52,18 @@ extension CPU {
|
|||
}
|
||||
}
|
||||
|
||||
program_counter = UInt16(Int(program_counter) + Int(distance))
|
||||
if(distance > 0) {
|
||||
program_counter = UInt16(Int(program_counter) + Int(distance))
|
||||
} else {
|
||||
program_counter = UInt16(Int(program_counter) + Int(distance))
|
||||
}
|
||||
|
||||
branch_was_taken = true
|
||||
|
||||
if(distance == -2) {
|
||||
print("Infinite loop at $\(program_counter.asHexString()). Halting execution.")
|
||||
cyclesInBatch = 0
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -116,7 +126,7 @@ func getOperandWordForAddressingMode(state: CPU, mode: AddressingMode) -> UInt16
|
|||
let pointer: UInt16 = state.memoryInterface.readWord(offset: UInt16(zp)) + UInt16(state.index_y)
|
||||
return state.memoryInterface.readWord(offset: pointer)
|
||||
default:
|
||||
print("Called getOperand: UInt16 on an instruction that expects a UInt8")
|
||||
print("Called getOperand: UInt16 on an instruction that expects a UInt8. Address: \(state.program_counter.asHexString())")
|
||||
return 0
|
||||
}
|
||||
|
||||
|
|
@ -231,7 +241,7 @@ class Opcodes: NSObject {
|
|||
return
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static func STY(state: CPU, addressingMode: AddressingMode) -> Void {
|
||||
let address: UInt16
|
||||
|
||||
|
|
@ -294,14 +304,14 @@ class Opcodes: NSObject {
|
|||
}
|
||||
|
||||
static func DEY(state: CPU, addressingMode: AddressingMode) -> Void {
|
||||
state.index_y = state.index_x &- 1
|
||||
state.index_y = state.index_y &- 1
|
||||
|
||||
state.updateZeroFlag(value: state.index_y);
|
||||
state.updateNegativeFlag(value: state.index_y);
|
||||
}
|
||||
|
||||
static func INY(state: CPU, addressingMode: AddressingMode) -> Void {
|
||||
state.index_y = state.index_x &+ 1
|
||||
state.index_y = state.index_y &+ 1
|
||||
|
||||
state.updateZeroFlag(value: state.index_y);
|
||||
state.updateNegativeFlag(value: state.index_y);
|
||||
|
|
|
|||
Loading…
Reference in New Issue